Patent Publication Number: US-2022218175-A1

Title: Mop bucket for cleaning and squeezing a flat mop

Description:
This application is a continuation of U.S. patent application Ser. No. 15/743,920, filed Jan. 11, 2018, which is a national stage entry under 35 U.S.C. 371 of PCT Patent Application No. PCT/CN2017/000347, filed May 11, 2017, which claims priority to China Patent Application No. 201620530924.7, filed Jun. 4, 2016; China Patent Application No. 201620853180.2, filed Aug. 9, 2016; China Patent Application No. 201720468446.6, filed Apr. 30, 2017; China Patent Application No. 201720468451.7, filed Apr. 30, 2017, China Patent Application No. 201720468452.1, filed Apr. 30, 2017; and China Patent Application No. 201720468440.9, filed Apr. 30, 2017, the entire contents of each of which are incorporated herein by reference. 
    
    
     FIELD OF THE INVENTION 
     The present invention relates to a mop bucket, and in particular to a mop bucket cleaning and squeezing a flat mop, and a cleaning tool set using the mop bucket. 
     DESCRIPTION OF THE PRIOR ART 
     In the prior art, there are three approaches for squeezing a flat mop. The first approach is by stepping on the pedal to squeeze a mop fabric on the flat mop. In this approach, a foot-operated squeezing device is provided on a mop bucket; the foot-operated squeezing device comprises a squeezing basket built-in the mop bucket and a pedal hinged to an upper portion of the mop bucket and arranged in opposite to the squeezing basket; and, the pedal and the squeezing basket form a squeezing space. During squeezing, the mop fabric on a mop plate of the flat mop should be detached firstly, the mop fabric is then placed into the squeezing space, and the squeezing space is shrunk by stepping on the pedal so as to squeeze water from the mop fabric. In this squeezing approach, a foot-operated squeezing device with a complicated structure needs to be designed, and the cost is thus relatively high; moreover, during squeezing, the mop fabric needs to be detached, and a pedaling operation needs to be performed by a foot, so that the operation is inconvenient. 
     The second approach is by centrifugal rotation. In this approach, a hand-operated rotary mop rod is used. During squeezing, two ends of a mop plate of a flat mop need to be bent and then placed into a squeezing water section in a mop bucket and then the mop rod is pressed down, so that the mop plate of the flat mop is centrifugally rotated for squeezing. In this squeezing approach, the mop plate of the flat mop needs to be designed as a bendable structure, the structure is complicated, and such a squeezing approach requires a hand-operated rotary mop rod so that the cost is relatively high. 
     The third approach is by pushing manually and squeezing. For example, Chinese Utility Model Patents CN201171658Y (Patent No.: ZL200720192814.5), CN203074606U (Patent No.: ZL201320019718.6), CN204146974U (Patent No.: ZL201420624020.1) and the like, disclosed a kind of flat mop, which comprises a mop rod, a flat mop plate movably connected onto the mop rod, a wiper disposed on the flat mop plate, and a squeezing mechanism disposed on the mop rod. The wiper on the flat mop plate is squeezed and cleaned by the relative movement and squeezing between the squeezing mechanism and the flat mop plate. This approach has the following disadvantages: during squeezing, it is necessary to hold the mop rod by one hand and the squeezing mechanism by the other hand to achieve the relative movement and squeezing between the squeezing mechanism and the flat mop plate by pushing or pulling the squeezing mechanism with a single hand. Therefore, the squeezing operation is very strenuous and this approach results in low practicability and low user experience. 
     At present, there is no mop bucket which is suitable for a flat mop and can achieve both functions of cleaning and squeezing. 
     SUMMARY OF THE INVENTION 
     A first technical problem to be solved in the present invention is to provide a mop bucket for cleaning and squeezing a flat mop, which can clean and squeeze a wiper on the flat mop, is integrated both functions of cleaning and squeezing together in one mop bucket, and can provide better cleaning and squeezing effects, and provide a convenient and labor-saving squeezing operation and pleasurable user experience. 
     A second technical problem to be solved by the present invention is to provide a cleaning tool set capable of cleaning and squeezing a wiper on a flat mop. 
     To solve the first technical problem, the mop bucket for cleaning and squeezing a flat mop with a wiper and a mop head, comprises a bucket body and a squeezing device disposed inside the bucket body; wherein the bucket body has a squeezing water section and a cleaning section, which are respectively at two different positions when used; when the mop head of the flat mop is removably inserted into the squeezing device, the squeezing device presses against the wiper on the mop head and scrapes the wiper on the mop head. 
     Preferably, the squeezing device comprises a frame and a squeezer; the frame has a squeezing port for receiving the mop head; the squeezer is disposed adjacent to the squeezing port, so that the squeezer can press the wiper on the mop head to scrape the wiper. 
     The squeezer can be in various shapes. Preferably, the squeezer is a squeezing strip, a squeezing sheet, or a rotatable squeezing water roller, and the squeezing is fixed on the frame; 
     or, the squeezer is a squeezing strip, a squeezing sheet, or a rotatable squeezing water roller, and the squeezer is movably connected to the frame via an elastic device; 
     or, the squeezer is a squeezing strip, a squeezing sheet, or a rotatable squeezing water roller, the frame has an inclined groove, and the squeezer is movably positioned in the groove and can move along the inclined groove. 
     Preferably, at least one squeezing device is disposed at the cleaning section, and at least one squeezing device is disposed at the squeezing water section. 
     Preferably, there is only one squeezing device which is disposed in either the squeezing water section or the cleaning section of the bucket body. 
     There are various methods for forming the cleaning section and the squeezing water section. Preferably, an upward protruding portion extending from the bucket body, which defines the squeezing water section, and the section of the bucket body below the upward protruding portion defines the cleaning section. 
     Further, preferably, the cleaning section and the squeezing water section are physically independent and separated with each other in the bucket body. 
     There are various methods for moving the squeezing device to realize the switchover of the squeezing device between the cleaning section and the squeezing water section. As a first preferred implementation, a sliding track is disposed on a top of the bucket body, and the squeezing device can slide on the sliding track and move between the squeezing water section and the cleaning section. 
     As a second preferred implementation of the switchover of the squeezing device between the cleaning section and the squeezing water section, a turnover frame with a head portion and a tail portion is disposed on the bucket body; the head portion is hinged to a top of the bucket body; the squeezing device is rotatably disposed on the tail portion of the turnover frame; the turnover frame can be positioned and switched between a horizontal state and a vertical state relative to the top of the bucket body, so as to switch the squeezing device between the squeezing water section and the cleaning section. 
     In order to avoid a direct fierce collision of the mop head with the bottom of the mop bucket when the flat mop is pressed down vigorously, preferably, a buffer for the flat mop is disposed within the squeezing water section and/or the cleaning section of the bucket body. 
     The structure of the buffer is in various forms. Preferably, the buffer is an elastic cushion, an elastic block or a spring-loaded device, which is disposed on the bottom of the bucket body; 
     the spring-loaded device comprises an ejected spring with a bottom and a top and a rebound carrier; the bottom of the ejected spring is fixed relative to the bucket body, while the top of the ejected spring presses against the rebound carrier. 
     Preferably, a plurality of drainage valves corresponding to the cleaning section and/or the squeezing water section are disposed on the bucket body. 
     Various approaches can be used to ensure the mop head to come into contact with water as little as possible or to keep it free from water during squeezing. As a first preferred implementation, an enclosure frame is disposed within the squeezing water section of the bucket body. 
     Further preferably, the enclosure frame comprises a upper end surface and a guide port inclined downward on the upper end surface. 
     As a second preferred implementation of ensuring the mop head to come into contact with water as little as possible or keeping it free from water, a water pumping device is disposed within the squeezing water section of the bucket body, and the water pumping device pumps water out of the squeezing water section. 
     The water pumping device can be of various structures. As a first preferred implementation, the water pumping device comprises a water pumping cylinder placed on the bottom of the bucket body; a baffle is disposed within the water pumping cylinder to divide the interior of the water pumping cylinder into an upper water pumping section connected to a water pumping pipe and a lower water supply section in communication with the bucket body; 
     a piston is disposed within the water pumping section and sealed against the water pumping section, and an elastic device is disposed between the piston and the baffle; and 
     a check valve is disposed on the baffle, which is closed when the piston is pressed down and opened when the piston is lifted up. 
     As a second preferred implementation of the water pumping device, the water pumping device comprises an impeller pump disposed on the bottom of the bucket body, which is connected to the water pumping pipe, an impeller is disposed within the impeller pump, a driving shaft is disposed in a the center of the impeller, and a driving gear is disposed on the driving shaft; 
     a gear carrier and a lifting rack are disposed within the bucket body, and a duplex gear comprising a bevel gear and a driving gear engaged with the lifting rack is disposed on the gear carrier; and 
     a vertical spindle is disposed on the gear carrier, and an upper gear engaged with the bevel gear and a lower gear engaged with the driving gear are disposed on the spindle. 
     As a third preferred implementation of ensuring the mop head to come into contact with water as little as possible or keeping it free from water, the squeezing device comprises a squeezing frame disposed in the squeezing water section, a cleaning frame disposed in the cleaning section and two squeezers; the squeezing frame has a squeezing port for receiving the mop head, and the cleaning frame has a cleaning port for receiving the mop head; the two squeezers are respectively disposed adjacent to the squeezing port of the squeezing frame and the cleaning port of the cleaning frame; so that each squeezer can touch the wiper on the mop head to scrape the wiper. 
     Preferably, the squeezing frame has a water passage extending toward the cleaning section, and the water from the wiper on the mop head squeezed by the squeezer in the squeezing water section flows into the cleaning section through the water passage. 
     As a fourth preferred implementation of ensuring the mop head to come into contact with water as little as possible or keeping it free from water, the bucket body has a raised step protruding upwardly from bottom of the squeezing water section. 
     To make the structure of the cleaning bucket more rational, preferably, the squeezing device is disposed in the squeezing water section, and a cleaner is disposed in the cleaning section; the cleaner can move up and down relative to the bucket body, when the wiper on the mop head moves relative to the cleaner, the wiper on the mop head is cleaned for being scrapped between the wiper on the mop head and the cleaner. 
     Preferably, the movement of the cleaner relative to the bucket body is achieved by hand. 
     Preferably, the cleaner is driven to move upward when the mop head is pressed down, and the cleaner is driven to move downward when the mop head is pulled upward, so that the relative movement between the cleaner and the mop head is achieved. 
     Preferably, the cleaner comprises a first frame and a second frame which are separate from each other; a cleaning component is disposed on the first frame or the second frame; a third frame is disposed between the first frame and the second frame; a first rod is hinged at two ends of the first frame, a second rod is hinged at two ends of the second frame, and a third rod close to the first frame and a fourth rod close to the second frame are hinged at two ends of the third frame; the first rod and the third rod are hinged at their lower ends, and the second rod and the fourth rod are hinged at their lower ends; and, during cleaning, a force is applied after the mop head is aligned with the third frame, so that the first frame and the second frame can move upward and downward. 
     Preferably, the cleaner is connected to a gear-rack mechanism which is driven by the mop head. 
     Preferably, the squeezing device comprises a squeezer for squeezing the wiper on the mop head and a first support opposite to the squeezer; the squeezer is directly or indirectly disposed on the bucket body, and the first support is directly disposed on the bucket body; the space between the squeezer and the first support is defined as a squeezing space; and, when the mop head is inserted into the squeezing space, the wiper on the mop head can move vertically relatively to the squeezer and be squeezed by the squeezer. 
     Preferably, the first support is a pair of support ribs longitudinally extending from an end surface of the bucket body; or a pair of support ribs transversely extending from a side surface of the bucket body; or a pair of support frames longitudinally extending from an end surface of the bucket body, with a roller being disposed at a tail end of each of the support frames; or a pair of support frames transversely extending from a side surface of the bucket body, with a roller being disposed on each of the support frames. 
     Preferably, a water flow device for transferring water from the squeezing water section to the cleaning section is disposed in the squeezing water section. 
     Preferably, the water flow device is a water flow passenger communicating the squeezing water section and the cleaning section, and the water flow passenger is disposed over the squeezing water section and the cleaning section. In this way, instead of flowing to the bottom of the squeezing water section, the wrung water directly flows to the upper side of the cleaning section from the upper side of the squeezing water section and then flows into the cleaning section. 
     To make the structure of the squeezing device simpler and to more easily assemble the squeezing device, preferably, the squeezing device is only disposed in the squeezing water section, the squeezing device comprises a squeezer for squeezing the wiper on the mop head and a first support opposite to the squeezer; the squeezer is directly or indirectly disposed on the bucket body, and the first support is disposed on the bucket body; the space between the squeezer and the first support is defined as a squeezing space; when the mop head is inserted into the squeezing space, the wiper on the mop head can move relatively to the squeezer and be squeezed by the squeezer. 
     Preferably, a cleaning device for cleaning the wiper is disposed within the cleaning section. 
     Preferably, the first support is a pair of support ribs longitudinally extending from an end surface of the bucket body; or a pair of support ribs transversely extending from a side surface of the bucket body; or a pair of support frames longitudinally extending from an end surface of the bucket body, with a roller being disposed at a tail end of each of the support frames; or a pair of support frames transversely extending from a side surface of the bucket body, with a roller being disposed on each of the support frames. 
     Preferably, the squeezer is a squeezing roller, a squeezing sheet or a squeezing plate. 
     Preferably, the squeezing device further comprises a frame disposed on the bucket body, and the squeezer is disposed on the frame. 
     Preferably, a water flow device for transferring water from the squeezing water section to the cleaning section is disposed in the squeezing water section. 
     Preferably, the water flow device is a water flow passenger communicating the squeezing water section and the cleaning section, and the water flow passenger is disposed over the squeezing water section and the cleaning section. In this way, instead of flowing to the bottom of the squeezing water section, the wrung water directly flows to the upper side of the cleaning section from the upper side of the squeezing water section and then flows into the cleaning section. 
     To make the structure of the squeezing device simpler and to more easily assemble the squeezing device, preferably, the squeezing device is only disposed in the squeezing water section, and a cleaning device for cleaning the wiper is disposed within the cleaning section. 
     Preferably, the cleaning device comprises a cleaner for squeezing and scraping the wiper on the mop head and a second support opposite to the cleaner; the cleaner is directly or indirectly disposed on the bucket body, and the second support is disposed on the bucket body; the space between the cleaner and the second support is defined as a cleaning space; and, when the mop head is inserted into the cleaning space, the wiper on the mop head can move relatively to the cleaner and be squeezed by the cleaner. 
     Preferably, the second support is a pair of support ribs longitudinally extending from an end surface of the bucket body; or a pair of support ribs transversely extending from a side surface of the bucket body; or a pair of support frames longitudinally extending from an end surface of the bucket body, with a roller being disposed at a tail end of each of the support frames; or a pair of support frames transversely extending from a side surface of the bucket body, with a roller being disposed on each of the support frames; or a pair of support frames longitudinally extending from an end surface of the bucket body, with a pair of springs and a pair of elastic blocks being disposed in each of the support frames, the springs acting on the elastic blocks to allow portions of the elastic blocks to rebound from the tail end of the support frames. 
     Preferably, the cleaner is a cleaning scraper, a cleaning brush, cleaning teeth or soft cleaning rubber. 
     Preferably, the cleaning device further comprises a cleaning frame disposed on the bucket body, and the cleaner is disposed on the cleaning frame. 
     To solve the second technical problem, the cleaning tool set comprises the mop bucket and a flat mop; wherein the flat mop comprises a mop rod and a mop head rotatably attached to the mop rod, and a wiper disposed on the mop head; the wiper is capable of touching the squeezing device on the mop bucket. 
     Compared with the prior art, the present invention has the following advantages: as the bucket body has a squeezing device, the mop rod can be held by both hands when in use to clean and squeeze the flat mop, thereby realizing the functions of cleaning and squeezing by the relative squeezing and movement between the mop head and the squeezing device; the operation is more labor-saving and simpler; the wiper can be wrung better; moreover, by disposing a mop bucket matched with the flat mop, it is convenient for cleaning and squeezing the flat mop at any time and at any place. 
     Meanwhile, no additional squeezing mechanism needs to be disposed on the flat mop, so that the mop is simpler in structure and easier to use. 
     The cleaning tool set of the present invention also has the above said advantages. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a mop bucket according to Embodiment 1 of the present invention; 
         FIG. 2  is a perspective view of a flat mop of the mop bucket according to Embodiment 1 of the present invention; 
         FIG. 3  is a perspective view showing the structure of a squeezing device according to Embodiment 1 of the present invention; 
         FIG. 4  is a perspective view showing the structure of a squeezing device according to Embodiment 2 of the present invention; 
         FIG. 5  is a perspective view showing the structure of a squeezing device according to Embodiment 3 of the present invention; 
         FIG. 6  is a perspective view showing the structure of a squeezing device according to Embodiment 4 of the present invention; 
         FIG. 7  is a perspective view showing the structure of a squeezing device according to Embodiment 5 of the present invention; 
         FIG. 8  is a perspective view showing the structure of a squeezing device according to Embodiment 6 of the present invention; 
         FIG. 9  is a perspective view of the arrangement of two squeezing devices of Embodiment 6 in the mop bucket according to Embodiment 1 of the present invention; 
         FIG. 10  is a schematic view of a buffer of the mop bucket according to Embodiment 1 of the present invention; 
         FIG. 11  is a perspective view of a squeezing water section with an enclosure frame according to Embodiment 1 of the present invention; 
         FIG. 12  is a perspective view of a mop bucket according to Embodiment 2 of the present invention (when the squeezing device is located within the cleaning section); 
         FIG. 13  is a perspective view of the mop bucket according to Embodiment 2 of the present invention (when the squeezing device is located within the squeezing water section); 
         FIG. 14  is a perspective view of a mop bucket according to Embodiment 3 of the present invention; 
         FIG. 15  is a perspective view of a mop bucket according to Embodiment 4 of the present invention; 
         FIG. 16  is a perspective view of a mop bucket according to Embodiment 5 of the present invention; 
         FIG. 17  is a perspective view of a mop bucket according to Embodiment 6 of the present invention; 
         FIG. 18  is a perspective view of a mop bucket according to Embodiment 7 of the present invention (when the valve plate occludes the flowing hole); 
         FIG. 19  is a perspective view of the mop bucket according to Embodiment 7 of the present invention (when the valve plate is opened); 
         FIG. 20  is an enlarged view of part A of  FIG. 18 ; 
         FIG. 21  is an enlarged view of part B of  FIG. 19 ; 
         FIG. 22  is a perspective view of a mop bucket according to Embodiment 8 of the present invention; 
         FIG. 23  is a perspective view when a lifting rack in a water pumping device of  FIG. 22  is moving downward; 
         FIG. 24  is a perspective view when the lifting rack in the water pumping device of FIG.  22  is returning to the original position; 
         FIG. 25  is a perspective view of a mop bucket according to Embodiment 9 of the present invention; 
         FIG. 26  is a perspective view of  FIG. 25 , when viewed from another perspective; 
         FIG. 27  is a perspective view of a mop bucket according to Embodiment 10 of the present invention (when the squeezing device is disposed within the cleaning section); 
         FIG. 28  is a perspective view of a mop bucket according to Embodiment 10 of the present invention (when the squeezing device is disposed within the squeezing water section); 
         FIG. 29  is a perspective view when the squeezing device of  FIG. 27  is disposed at a lower position; 
         FIG. 30  is a perspective view when the squeezing device of  FIG. 27  is disposed at an upper position; 
         FIG. 31  is a perspective view of a mop bucket according to Embodiment 11 of the present invention (when the squeezing device is disposed within the cleaning section); 
         FIG. 32  is a perspective view of a mop bucket according to Embodiment 10 of the present invention (when the squeezing device is disposed within the squeezing water section); 
         FIG. 33  is a perspective view of a flat mop of a mop bucket according to Embodiment 12 of the present invention; 
         FIG. 34  is a perspective view of a cleaner according to Embodiment 1 of the present invention; 
         FIG. 35  is a perspective view of a cleaner according to Embodiment 2 of the present invention; 
         FIG. 36  is a perspective view of a cleaner according to Embodiment 3 of the present invention; 
         FIG. 37  is a perspective view of a cleaner according to Embodiment 4 of the present invention; 
         FIG. 38  is a perspective view of a first support according to Embodiment 1 of the present invention; 
         FIG. 39  is a perspective view of a first support according to Embodiment 2 of the present invention; 
         FIG. 40  is a perspective view of a first support according to Embodiment 3 of the present invention; 
         FIG. 41  is a perspective view of a first support according to Embodiment 4 of the present invention; 
         FIG. 42  a perspective view of a first support according to Embodiment 5 of the present invention; 
         FIG. 43  is a perspective view of a mop bucket according to Embodiment 13 of the present invention; 
         FIG. 44  is a perspective view of a mop bucket according to Embodiment 14 of the present invention; 
         FIG. 45  is a perspective view of a cleaner of the mop bucket according to Embodiment 14 of the present invention; 
         FIG. 46  is a schematic diagram of the coordination of a cleaner with a gear-rack of a mechanism according to Embodiment 15 of the present invention; 
         FIG. 47  is a perspective view of a mop bucket to which a first squeezing device is applied according to Embodiment 16 of the present invention; 
         FIG. 48  is a perspective view of the mop bucket to which a second squeezing device is applied according to Embodiment 16 of the present invention; 
         FIG. 49  is a perspective view of the mop bucket to which a third squeezing device is applied according to Embodiment 16 of the present invention; 
         FIG. 50  is a perspective view of the mop bucket to which a forth squeezing device is applied according to Embodiment 16 of the present invention; 
         FIG. 51  is a perspective view of the mop bucket to which a fifth squeezing device is applied according to Embodiment 16 of the present invention; 
         FIG. 52  is a perspective view of the mop bucket to which a sixth squeezing device is applied according to Embodiment 16 of the present invention; 
         FIG. 53  is a perspective view of the mop bucket to which a first cleaning device is applied according to Embodiment 16 of the present invention; 
         FIG. 54  is a perspective view of the mop bucket to which a second cleaning device is applied according to Embodiment 16 of the present invention; 
         FIG. 55  is a perspective view of the mop bucket to which a third cleaning device is applied according to Embodiment 16 of the present invention; 
         FIG. 56  is a perspective view of the mop bucket to which a forth cleaning device is applied according to Embodiment 16 of the present invention; 
         FIG. 57  is a perspective view of the mop bucket to which a fifth cleaning device is applied according to Embodiment 16 of the present invention; and 
         FIG. 58  is a perspective view of the mop bucket to which a sixth cleaning device is applied according to Embodiment 16 of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     To enable a further understanding of the present invention content of the invention herein, refer to the detailed description of the invention and the accompanying drawings below: 
     Embodiment 1 of the mop bucket of the present invention 
       FIG. 1 - FIG. 11  show a first embodiment of the mop bucket for cleaning and squeezing a flat mop. The mop bucket comprises a bucket body  1  and two squeezing devices  7  disposed on the bucket body  1 . The bucket body  1  is divided into two volumes, one volume defined as a squeezing water section  5  and the other volume defined as a cleaning section  6 , which are separated with each other and respectively located at two different positions, the two squeezing devices  7  are respectively disposed at the squeezing water section  5  and the cleaning section  6 . The mop bucket is used together with a flat mop  2 ; the flat mop  2  comprises a mop rod  3 , a mop head  4  rotatably attached to the mop rod  3 , and a wiper disposed on the mop head  4 . As shown in  FIG. 2 , the wiper can be disposed on a front surface and/or a rear surface of the mop head  4 . When the mop head  4  of the flat mop  2  is removably inserted into one of squeezing device  7 , the squeezing device  7  presses against the wiper on the mop head  4  and scrapes the wiper on the mop head  4  repetitively, so as to clean the wiper or make the wiper be squeezed. 
     The detail structure of the squeezing device  7  can be anyone of the following six embodiments. 
     Embodiment 1 of the Squeezing Device of the Present Invention 
       FIG. 3  shows a first embodiment of the squeezing device, the squeezing device  7  comprises a frame  9  and a squeezer  11 ; the frame  9  has a squeezing port  10  for receiving the mop head  4 . The squeezer  11  is disposed adjacent to the squeezing port  10  and exposed out of the squeezing port  10 . In this embodiment, the squeezer  11  is a squeezing roller which is fixed on the squeezing port  10 . That is, the width of the squeezing port  10  remains unchanged. After the mop head  4  is inserted into the squeezing port  10 , the squeezer  11  can press the wiper on the mop head  4  to scrape the wiper. 
     Embodiment 2 of the Squeezing Device of the Present Invention 
       FIG. 4  shows Embodiment 2 of the squeezing device, the difference between the squeezing device of Embodiment 2 and of Embodiment 1 is that, the squeezer  11  is a squeezing strip movably connected to the squeezing port  10 . That is, during cleaning and squeezing, the width of the squeezing port  10  can be changed by moving the squeezing strip, so that the wiper on the mop head  4  is scraped. Specifically, the squeezing strip is movably connected to the squeezing port  10  of the frame  9  via an elastic device which is a spring  14 . That is, the squeezing strip is connected to the frame  9  via the spring  14 , so that the squeezer  11  is somewhat elastic. Meanwhile, a squeezing strip  12  and a brush column  13  are disposed on the squeezing strip. The cross-section of the squeezing strip  12  is approximately arch-shaped. The squeezing strip  12  plays a primary squeezing role, and the brush column  13  plays an auxiliary squeezing role. During squeezing, the mop head  4  can be more smoothly inserted into the squeezing port  10  and the wiper on the mop head  4  can be squeezed by the squeezing strip  12  and the brush column  13 , so that the wiper on the mop head  4  can be better cleaned and wrung. 
     Embodiment 3 of the Squeezing Device of the Present Invention 
       FIG. 5  shows Embodiment 3 of the squeezing device, the difference between the squeezing device of Embodiment 3 and of Embodiment 1 is that, the squeezer  11  is a squeezing strip fixed on the frame  9 . Specifically, a squeezing strip  12  and a brush column  13  are disposed on the squeezing strip, and the cross-section of the squeezing strip  12  is approximately U-shaped. 
     Embodiment 4 of the Squeezing Device of the Present Invention 
       FIG. 6  shows Embodiment 4 of the squeezing device, the difference between the squeezing device of Embodiment 4 and of Embodiment 1 is that, the squeezer  11  is a squeezing strip disposed in the squeezing port  10 . Specifically, a squeezing strip  12  is disposed on the squeezing strip, and the squeezing strip  12  is a squeezing ridge. 
     Embodiment 5 of the Squeezing Device of the Present Invention 
       FIG. 7  shows Embodiment 5 of the squeezing device, the difference between the squeezing device of Embodiment 5 and of Embodiment 4 is that, a brush column  13  is disposed on the squeezing strip. 
     Embodiment 6 of the Squeezing Device of the Present Invention 
       FIG. 8  shows Embodiment 6 of the squeezing device, the difference between the squeezing device of Embodiment 6 and of Embodiment 2 is the movably mounting manner of the squeezer. That is, the frame  9  has an inclined groove, and the squeezer  11  is movably positioned in the groove and can move along the inclined groove, so that the way of changing the width of the squeezing port is different. Specifically, the squeezer  11  is a squeezing strip; protruded sliders  15  are disposed at two ends of the squeezing strip; and correspondingly, an oblique slide rail  16  matched with the sliders  15  are disposed on the frame  9 ; the sliders  15  are disposed in the oblique slide rail  16  and can slide within the oblique slide rail  16  so as to move the squeezer  11 , so that the width of the squeezing port  10  can be changed during cleaning and squeezing of the mop head  4 . 
     In this embodiment, a baffle  8  is disposed inside the bucket body  1  so that the cleaning section  6  and the squeezing water section  5  are physically separated with each other in the bucket body  1 . At least one squeezing device  7  is disposed at the cleaning section  6 , and at least one squeezing device  7  is disposed at the squeezing water section  5 . As shown in  FIG. 1 , one squeezing device  7  is disposed at each of the cleaning section  6  and the squeezing water section  5 , wherein the squeezing device  7  within the cleaning section  6  is used for squeezing and cleaning the wiper on the mop head  4  and the squeezing device  7  within the squeezing water section  5  is used for squeezing and squeezing the wiper on the mop head  4 . 
     As shown in  FIG. 9 , two squeezing devices  7  of Embodiment 6 are disposed at the cleaning section  6  and the squeezing water section  5 , and the two squeezing devices  7  are arranged in parallel and located on two sides of the squeezing port  10 , respectively, so that the cleaning and squeezing effects are enhanced. 
     In order to prevent the mop head  4  of the flat mop  2  from directly coming into contact with the bottom of the mop bucket, a buffer for the flat mop  2  is disposed within the squeezing water section  5  and/or the cleaning section  6  of the bucket body L As shown in  FIG. 10 , the buffer is a spring-loaded device disposed on a bottom of the bucket body  1 ; the spring-loaded device comprises an ejected spring  17  with a lower end and an upper end and a rebound carrier  18 ; a fixed sleeve  19  is disposed on the bottom of the cleaning section  6  and the squeezing water section  5 , and the rebound carrier  18  is sheathed within the fixed sleeve  19 ; the bottom of the ejected spring  17  is fixed relative to the bucket body  1 , while the top of the ejected spring  17  presses against the rebound carrier. During cleaning and squeezing, the mop head  4  is ejected onto the rebound carrier  18  so that the mop head is cushioned by the elasticity of the ejected spring  17 . 
     During squeezing within the squeezing water section  5 , the wrung water is retained within the squeezing water section  5 , so that a certain water level is formed within the squeezing water section  5 . In order to prevent the mop head  4  from coming into contact with the wrung water during squeezing to influence the squeezing effect, as shown in  FIG. 11 , an enclosure frame  25  is disposed on the bottom of the squeezing water section  5 , and the enclosure frame  25  further comprises a upper end surface and a guide port  25   a  inclined downward on the upper end surface. In this way, during squeezing, the mop head  4  is pressed down and inserted into the enclosure frame  25 ; a very large amount of the wrung water falls outside the enclosure frame  25 , with only a very small amount of water falling into the enclosure frame  25 ; and the wiper on the mop head  4  absorb this very small amount of water again. In this way, after multiple repetitions of squeezing, the wiper is wrung better. 
     In practical applications, the mop head  4  is rotated to a cleaning and squeezing state, that is, the mop head  4  is rotated to be parallel to the mop rod  3  (or not parallel to the mop rod  3 ), so that the mop head  4  is inserted into the squeezing port  10 . Specifically, in the cleaning state, the mop head  4  is moved and squeezed between the cleaning section  6  and the squeezer  11  of the squeezing device  7  so as to squeeze and clean the wiper. In the squeezing state, the mop head  4  is moved and squeezed between the squeezing water section  5  and the squeezer  11  of the squeezing device  7  so as to squeeze and squeeze the wiper. In addition, when the mop head  4  is pressed down, the mop head directly comes into contact with the buffer, so that the mop head  4  can be prevented from directly coming into contact with the bottom of the bucket body  1 . Accordingly, the mop head is cushioned, and it is more convenient for the cleaning and squeezing operations. 
     In order to achieve better cleaning and squeezing effects, generally, the mop head  4  moves vertically relatively to the squeezing device  7 , that is, the mop head  4  moves up and down in its axial direction. Therefore, relative movement is generated between the mop head  4  and the squeezing device  7 , so that the wiper on the mop head  4  moves in relative to and against the squeezer  11  of the squeezing device  7  for cleaning or squeezing. During cleaning or squeezing, the mop rod  3  can be held and pressed down by two hands, so that the operation is very convenient and labor-saving. 
     To easily rotate the mop head  4 , a counter weight for assisting in rotating the mop head  4  is disposed on the mop head  4  so that the mop head  4  can be rotated more easily due to the gravity of the counter weight. 
     Embodiment 2 of the Mop Bucket of the Present Invention 
       FIG. 12 - FIG. 13  show a second embodiment of the mop bucket for cleaning and squeezing a flat mop. The difference between this embodiment and Embodiment 1 of the mop bucket is that, there is only one squeezing device  7  which is disposed in either the squeezing water section  5  or the cleaning section  6  of the bucket body L Specifically, a sliding track  1   a  is disposed on a top of the bucket body  1 , and the squeezing device  7  can slide on the sliding track  1   a  and move between the squeezing water section  5  and the cleaning section  6 , so that the switchover of the squeezing device  7  between the squeezing water section  5  and the cleaning section  6  is realized. 
     Embodiment 3 of the Mop Bucket of the Present Invention 
       FIG. 14  shows a third embodiment of the mop bucket for cleaning and squeezing a flat mop. The difference between this embodiment and Embodiment 1 of the mop bucket is the forming structure of the cleaning section  6  and the squeezing water section  5 . Specifically, an upward protruding portion  49  extending from the bucket body  1 , which defines the squeezing water section  5 , and the section of the bucket body  1  below the upward protruding portion  49  defines the cleaning section  6 . 
     Embodiment 4 of the Mop Bucket of the Present Invention 
       FIG. 15  shows a forth embodiment of the mop bucket for cleaning and squeezing a flat mop. The difference between this embodiment and Embodiment 1 of the mop bucket is that, the manner for mounting the ejected spring  17  and the rebound carrier  18  in the buffer on the bottom of the bucket body and the approach for ensuring the mop head to come into contact with little water or to keep it free from water during squeezing. In this embodiment, the buffer comprises an ejected spring  17  with a bottom and a top and a rebound carrier  18 , the bucket body  1  has a raised step  48  protruding upwardly from bottom of the squeezing water section  5 , and buffers are disposed on the bottom of the cleaning section  6  and on the raised step  48 . Specifically, two fixed spring sleeves  20  are disposed on the bottom of the cleaning section  6  and on the raised step  48 ; a fixed guide column  21  is disposed within each of the spring sleeves  20 ; the cross-section of the rebound carrier  18  is roughly M-shaped; and, the rebound carrier  18  has a recessed portion  181  capable of accommodating the mop head  4 . That is, the mop head  4  can resist against the recessed portion  181  when it is pressed down. Guide tips are formed on two sides of the recessed portion  181 , respectively; and guide sleeves  23  are sheathed on the guide tip; the guide sleeves  23  are sheathed outside the guide columns  21 ; the ejected springs  17  are sheathed outside the guide sleeves  23  and the guide columns  21 ; and, the bottoms of the ejected springs  17  are resisted against the bottom of the bucket body  1 , while the tops thereof are resisted against the guide tips. In this embodiment, a water accumulating interlayer for containing water wrung during squeezing is formed around the raised step  48 . The mop head  4  can only move down to the recessed portion of the rebound carriers  18  above the raised step  48 , so that the mop head will not come into contact with the accumulated water. 
     Embodiment 5 of the Mop Bucket of the Present Invention 
       FIG. 16  shows a fifth embodiment of the mop bucket for cleaning and squeezing a flat mop. The difference between this embodiment and Embodiment 4 of the mop bucket is, the manner for mounting the ejected spring  17  and the rebound carrier  18  in the buffer on the bottom of the bucket body. Specifically, the buffer comprises an ejected spring  17  with a bottom and a top and a rebound carrier  18 , two fixed guide frames  24  are disposed on the bottom of the squeezing water section  5  and the cleaning section  6 , and the rebound carrier  18  has a recessed portion  22 . The mop head  4  is resisted against the recessed portion  22  when it is pressed down. Guide tips are formed on two sides of the recessed portion  22 , respectively. The guide tips are located within the guide frames  24 , and guide sleeves  23  are disposed within the guide tips. The ejected spring  17  is sheathed outside the guide sleeves  23 , and the bottom of the ejected spring  17  is resisted against the bottom of the bucket body  1  while the top thereof is resisted against the guide tips. 
     Embodiment 6 of the Mop Bucket of the Present Invention 
       FIG. 17  shows a sixth embodiment of the mop bucket for cleaning and squeezing a flat mop. The difference between this embodiment and Embodiment 1 of the mop bucket is the buffer. Specifically, the buffer comprises a lifting frame  54 , a cushion piston  55  and a cushion spring  56 , wherein a cushion notch is formed on the bottom of the lifting frame  54 ; both the cushion piston  55  and the cushion spring  56  are disposed within the cushion notch; and, one end of the cushion spring  54  is resisted against the cushion piston  55 , while the other end thereof is resisted against the bottom of the cushion notch. During squeezing or cleaning, the mop head  4  can be resisted against the cushion piston  55  to be cushioned. 
     Embodiment 7 of the Mop Bucket of the Present Invention 
       FIG. 18 - FIG. 21  show a seventh embodiment of the mop bucket for cleaning and squeezing a flat mop. The difference between this embodiment and Embodiment 1 of the mop bucket is that, the approach for ensuring the mop head to come into contact with little water or keeping it free from water during squeezing is different. Specifically, the water pumping device comprises a water pumping cylinder  27  placed on the bottom of the bucket body  1 ; a baffle  28  is disposed within the water pumping cylinder  27  to divide the interior of the water pumping cylinder into an upper water pumping section  29  connected to a water pumping pipe and a lower water supply section  30  in communication with the bucket body  1 ; a piston  31  is disposed within the water pumping section  29  and sealed against the water pumping section  29 , and an elastic device is disposed between the piston  31  and the baffle  28 ; a check valve is disposed on the baffle  28 , which is closed when the piston  31  is pressed down and opened when the piston  31  is lifted up. 
     In this embodiment, the elastic device is a water pumping spring  32 ; the check valve is a valve plate  33  pivoted to an upper surface of the baffle  28 ; and, a flowing hole  34  is formed on the baffle  28 , and the valve plate  33  can occlude the flowing hole  34 . The flowing hole 
     In practical applications, the mop head  4  is moved down to press down the piston  31 . In this case, the volume of the water pumping section  29  is decreased, the valve plate  33  occludes the flowing hole  34  due to water pressure, and water within the water pumping section  29  is drained by the water pumping pipe. When the mop head  4  is moved up, the volume of the water pumping section  29  is increased, water within the squeezing water section flows through the water supply section  30 , opens the valve plate and enters the water pumping section  29 . Of course, it is possible that another portion of the flat mop  2  or a specially designed component can interact with the piston  31 . 
     Embodiment 8 of the Mop Bucket of the Present Invention 
       FIG. 22 - FIG. 24  show an eighth embodiment of the mop bucket for cleaning and squeezing a flat mop. The difference between this embodiment and Embodiment 1 of the mop bucket is that, the approach for ensuring the mop head to come into contact with little water or keeping it free from water during squeezing is different. Specifically, the water pumping device comprises an impeller pump  35  arranged on the bottom of the bucket body  1 , which is connected to the water pumping pipe, an impeller is disposed within the impeller pump  35 ; driving shaft is disposed in the center of the impeller, and a driving gear  36  is disposed on the driving shaft; a gear carrier  37  and a lifting rack  38  capable of being driven by the flat mop are disposed within the bucket body  1 ; and a duplex gear comprising a bevel gear  39  and a driving gear  40  engaged with the lifting rack  38  is disposed on the gear carrier  37 ; a vertical spindle  41  is disposed on the gear carrier  37 , and an upper gear  42  engaged with the bevel gear  39  and a lower gear  43  engaged with the driving gear  36  are disposed on the spindle  4 L In this embodiment, a rack return spring can be further disposed on the bottom of the bucket body L The gear return spring is resisted against the lifting gear  38  so that the mop head  4  is moved up to return to the original position. 
     In practical applications, the mop head  4  is moved down to push the lifting rack  38  to lower down. The lowering of the lifting gear  38  drives the driving gear  40  to rotate, the rotation of the driving gear  40  drives the bevel gear  39  to rotate, and the rotation of the bevel gear  39  drives the upper gear  42  to rotate. In this way, the spindle  41  is rotated, and the upper gear  43  is rotated. The rotation of the lower gear  43  drives the driving gear  36  to rotate so as to drive the impeller to rotate to pump water, so that water is drained through the water pumping pipe. 
     Embodiment 9 of the Mop Bucket of the Present Invention 
       FIG. 25 - FIG. 26  show a ninth embodiment of the mop bucket for cleaning and squeezing a flat mop. The difference between this embodiment and Embodiment 1 of the mop bucket is that, the approach for ensuring the mop head to come into contact with little water or keeping it free from water during squeezing is different. Specifically, the squeezing device  7  comprises a squeezing frame  44  disposed in the squeezing water section  5 , a cleaning frame  45  disposed in the cleaning section  6  and two squeezers  11 ; the squeezers  11  for squeezing the wiper on the mop head  4  are disposed in both the squeezing frame  44  and the cleaning frame  45 ; the squeezing frame  44  has a squeezing port  44   a  for receiving the mop head  4 , and the cleaning frame  45  has a cleaning port  45   a  for receiving the mop head  4 ; the two squeezers  11  are respectively disposed adjacent to the squeezing port  44   a  of the squeezing frame  44  and the cleaning port  45   a  of the cleaning frame  45 ; so that each squeezer  11  can touch the wiper on the mop head  4  to scrape the wiper. In this embodiment, the squeezers  11  are protruded from edges of the squeezing port  10  and the cleaning port  45   a . After the mop head  4  is inserted into the squeezing port  10 /the cleaning port  45   a , the squeezers  11  can touch the wiper on the mop head  4  so as to clean and squeeze the wiper by repeatedly scraping it by relative movement. 
     As shown in  FIG. 26 , the frame  44  has a water passage  46  extending toward the cleaning section  6 , and water squeezed by scraping the wiper on the mop head  4  by the squeezer  11  within the squeezing water section flows through the water passage  46  to the cleaning section  6 . In this embodiment, the tail end of the water passage  46  is communicated with the cleaning frame  45 , and the squeezers  11  are squeezing strips with water ports  47  formed thereon. The water ports  47  form water inlets of the water passage  46 , and the squeezed water flows into the water passage  46  through the water ports  47 . In this structure design, a very large amount of the squeezed water directly flows through the water passage  46  to the cleaning section  6 , so that the amount of water falling into the squeezing water section  5  is decreased. 
     Embodiment 10 of the Mop Bucket of the Present Invention 
       FIG. 27 - FIG. 30  show a tenth embodiment of the mop bucket for cleaning and squeezing a flat mop. The difference between this embodiment and Embodiment 1 of the mop bucket is that, the bucket body  1  only has one squeezing device  7  and one section (volume) which simultaneously serves as the cleaning section  6  and the squeezing water section  5 . The squeezing device  7  is switched between the cleaning state and the squeezing state. When the squeezing device is in a first state, the space inside the bucket body  1  serves as the cleaning section  5 ; and when the squeezing device is in a second state, the space inside the bucket body  1  serves as the squeezing water section  6 . Specifically, a U-shaped rail rack  50  having an upward opening and a lifting frame  54  are disposed in the bucket body  1 , wherein two vertical rail slots  51  are disposed on the U-shaped rail rack  50 ; lower positioning grooves  52  extending transversely are disposed at lower ends of the rail slots  51 , while upper positioning grooves  53  extending transversely are disposed at upper ends of the rail slots  51 ; and, lifting heads are disposed at lower ends on two sides of the lifting frame  54 , the lifting heads are disposed within the rail slots  51 , and the squeezing device  7  is disposed at an upper end of the lifting frame  54 . 
     When the lifting frame  54  is located at a lower position, the lifting heads slide into and are positioned in the lower positioning grooves  52 . In this case, the space within the bucket body  1  serves as the cleaning section, and the mop head  4  moves back and forth to realize movement in relative to the squeezing device  7  for the purposes of squeezing and cleaning. When the lifting frame  54  is located at an upper position, the lifting heads slide into and are positioned in the upper positioning grooves  53 . In this case, a section of the lifting frame  54  above the bucket body  1  serves as the squeezing water section, and the mop head  4  moves back and forth to realize movement in relative to the squeezing device  7  for the purposes of squeezing and squeezing. 
     Embodiment 11 of the Mop Bucket of the Present Invention 
       FIG. 31 - FIG. 32  show an eleventh embodiment of the mop bucket for cleaning and squeezing a flat mop. The difference between this embodiment and Embodiment 1 of the mop bucket is that, the squeezing water section  5  and the cleaning section  6  are located within a same space of the bucket body  1  of the mop bucket and the squeezing device  7  is switched between the squeezing water section  5  and the cleaning section  6  by the horizontal state and the vertical state of the squeezing device. Specifically, a turnover frame  57  with a head  57   a  and a tail portion  57   b  is disposed on the bucket body  1 ; the head portion  57   a  is hinged to a top of the bucket body; the squeezing device  7  is rotatably disposed on the tail portion  57   b  of the turnover frame  57 ; the turnover frame  57  can be positioned and switched between a horizontal state and a vertical state relative to the top of the bucket body  1 , so as to switch the squeezing device  7  between the squeezing water section  5  and the cleaning section  6 . 
     In this embodiment, vertical hinge joints are disposed at upper ends of two side surfaces of the bucket body  1 ; two hinge shafts are correspondingly disposed at the head  57   a  of the turnover frame  57 ; and the two hinge shafts are disposed within the two hinge joints, respectively. When the turnover frame  57  is placed horizontally, the tail portion  57   b  is snap jointed with the bucket body  1 , a cleaning section is formed within the bucket body  1 , and the mop head  4  moves back and forth realize movement in relative to the squeezing device  7  for the purposes of squeezing and cleaning. After the turnover frame  57  is turned over uprightly, the tail portion  57   b  is snap jointed with the bucket body  1 , a squeezing water section is formed within a section of the turnover frame  57  above the bucket body  1 , and the mop head  4  moves back and forth to realize movement in relative to the squeezing device  7  for the purposes of squeezing and squeezing. 
     Embodiment 12 of the Mop Bucket of the Present Invention 
       FIG. 33 - FIG. 42  show a twelfth embodiment of the mop bucket for cleaning and squeezing a flat mop. The mop bucket comprises a bucket body  1 , and a flat mop  2  used together with the mop bucket comprises a mop rod  3  and a mop head  4  rotatably attached to the mop rod  3 , and a wiper is disposed on the mop head  4 , as shown in  FIG. 33 . 
     The bucket body  1  has a squeezing water section  5  and a cleaning section  6  which are physically separated with each other inside the bucket body  1 ; a squeezing device is disposed in the squeezing water section  5 , and a cleaner  14 ′ for cleaning the wiper is disposed in the cleaning section  6 ; the cleaner  14 ′ can move up and down relative to the bucket body  1 , when the wiper on the mop head  4  moves relative to the cleaner  14 ′, the wiper on the mop head  4  is cleaned for being scrapped between the wiper on the mop head  4  and the cleaner  14 ′. The independent squeezing water section  5  and the independent cleaning section  6  mean that the bucket body  1  is physically divided into two separated volumes, which are not communicated with each other, one volume defined as the cleaning section  6 , and another volume defined as the squeezing water section  5 . 
     The squeezing device can be anyone of the squeezing devices described above. In this embodiment, the squeezing device comprises a squeezer  7 ′ and a first support opposite to the squeezer  7 ′; the squeezer  7 ′ is used for squeezing the wiper on the mop head  4 ; the first support is directly disposed on mop bucket; the space between the squeezer  7 ′ and the first support is defined as a squeezing space. Due to the presence of the first support, the mop head  4  can be prevented from warping or skewing during squeezing. 
     The specific shape and structure of the squeezer  7 ′ can be in various forms. For example, the squeezer  7 ′ is a squeezing roller, a squeezing sheet, a squeezing plate or the like. In addition, the squeezer  7 ′ is directly or indirectly disposed on the bucket body  1  of the mop bucket. In this embodiment, the squeezer  7 ′ is indirectly disposed on the bucket body  1  of the mop bucket. As shown in  FIG. 10 , the squeezer  7 ′ is disposed on a frame  8 ′, and the frame  8 ′ is then disposed on the mop bucket. 
     To prevent the mop head  4  from warping or skewing during squeezing, a first support is disposed on the mop bucket. The first support supports and positions the mop head  4 . During squeezing, the first support will not always be in contact with the mop head. 
     The detail structure of the first support can be anyone of the following five embodiments. 
     Embodiment 1 of the First Support of the Present Invention 
       FIG. 38  shows Embodiment 1 of first support, in this embodiment, the first support is a pair of support ribs  9 ′ longitudinally extending from an end surface of the bucket body  1 . 
     Embodiment 2 of the First Support of the Present Invention 
       FIG. 39  shows Embodiment 2 of the first support. The difference between the first support of Embodiment 2 and of Embodiment 1 is, the mounting position of the first support. Specifically, the first support is a pair of support ribs  9 ′ transversely extending from a side surface of the bucket body  1 . 
     Embodiment 3 of the First Support of the Present Invention 
       FIG. 40  shows Embodiment 3 of the first support. The difference between the first support of Embodiment 3 and of Embodiment 1 is that, the structure of the first support is different. Specifically, the first support is a pair of guide plates  12 ′ transversely extending from a side surface of the bucket body  1 , and guide slots are disposed on two sides of the mop head. When the mop head  4  is inserted into a squeezing space, the pair of guide plates  12 ′ are inserted into the guide slots so as to support and position the mop head  4 . 
     Embodiment 4 of the First Support of the Present Invention 
       FIG. 41  shows Embodiment 4 of the first support. The difference between the first support of Embodiment 4 and of Embodiment 1 is that, the structure of the first support is different. Specifically, the first support is a pair of support frames  10 ′ longitudinally extending from an end surface of the bucket body  1 , with a roller  11 ′ being disposed at a tail end of each of the support frames  10 ′. 
     Embodiment 5 of the First Support of the Present Invention 
       FIG. 42  shows Embodiment 5 of the first support. The difference between the first support of Embodiment 2 and of Embodiment 1 is that, the structure of the first support is different. Specifically, the first support is a pair of support frames  10 ′ transversely extending from a side surface of the bucket body  1 , with a roller  11 ′ being disposed on each of the support frames  10 ′. 
     In addition, the first support can also be a wall of the mop bucket opposite to the squeezer  7 . 
     In order to prevent the wrung water from retaining in the squeezing water section  5 , a water flow device for transferring water in the squeezing water section  5  to the cleaning section  6  is disposed in the squeezing water section  5 . The water flow device can be an existing water pumping device which directly pumps water on the bottom of the squeezing water section to the cleaning section. In this embodiment, the water flow device is a water flow passenger  13 ′ communicating the squeezing water section  5  and the cleaning section  6 , and the water flow passenger  13 ′ is disposed over the squeezing water section  5  and the cleaning section  6 . As shown in  FIGS. 10 to 14 , specifically, when the squeezer  7  is disposed on the frame  8 , the water flow passenger  13 ′ can be directly disposed on the frame  8 ′, that is, the wrung water can be transferred to the cleaning section  6  by the water flow passenger  13 ′, so that the wrung water is prevented from retaining in the squeezing water section  5 . 
     In this embodiment, the cleaner  14 ′ is provided within the bucket body  1  in such a way that the cleaner  14 ′ can be moved up and down. During cleaning, the mop head  4  is switched to the cleaning state, and the cleaner  14 ′ is moved up and down, so that the mop head  4  is moved relative to the cleaner  14  to clean the wiper by the cleaner  14 ′. Switching the mop head  4  to the cleaning state is generally rotating the mop head  4  to be parallel to or approximately parallel to the mop rod  3 . In addition, the structure of the cleaner  14 ′ will not be limited as long as the cleaner can scrape and thus clean the wiper on the mop head. 
     In this embodiment, the movement of the cleaner  14 ′ is achieved by hand. As shown in  FIGS. 2 to 5 , by moving the cleaner  14 ′ up and down by hand, the relative movement between the cleaner  14  and the mop head  4  is achieved, and the wiper is cleaned by the cleaner  14 ′. 
     The detail structure of the cleaner can be anyone of the following four embodiments. 
     Embodiment 1 of the Cleaner of the Present Invention 
       FIG. 34  shows Embodiment 1 of the cleaner, in this embodiment, the cleaner  14 ′ has a cleaning plate  16 ′, and a cleaning component is disposed on a side of the cleaning plate  14 ′. In this embodiment, the cleaning component is brush bristle  17 ′. The wiper is cleaned by the cleaning component. 
     Embodiment 2 of the Cleaner of the Present Invention 
       FIG. 35  shows Embodiment 2 of the cleaner. The difference between the cleaner of Embodiment 2 and of Embodiment 1 is that, the cleaning component is different. Specifically, the cleaning component in this embodiment is a scraper  18 ′. 
     Embodiment 3 of the Cleaner of the Present Invention 
       FIG. 36  shows Embodiment 3 of the cleaner. The difference between the cleaner of Embodiment 3 and of Embodiment 1 is that, the structure of the cleaner is different. Specifically, the cleaner  14 ′ has an enclosure frame  19 ′, and a cleaning component is disposed within the enclosure frame  19 ′, wherein the cleaning component is brush bristle  17 ′. 
     Embodiment 4 of the Cleaner of the Present Invention 
       FIG. 37  shows Embodiment 4 of the cleaner. The difference between the cleaner of Embodiment 4 and of Embodiment 1 is the cleaning component. Specifically, the cleaner  14 ′ has an enclosure frame  19 ′, and a cleaning component is disposed within the enclosure frame  19 ′, wherein the cleaning component is a scraper  18 ′. 
     The cleaner in this embodiment can be of a cleaner structure described above, and the cleaning component in the cleaner can also be soft rubber. The cleaning plate or the enclosure frame can be lifted and guided by guide rails which can be disposed on the wall of the mop bucket. 
     Embodiment 13 of the Mop Bucket of the Present Invention 
       FIG. 43  shows a thirteenth embodiment of the mop bucket for cleaning and squeezing a flat mop  4 . The difference between Embodiment 13 of the mop bucket and Embodiment 12 of the mop bucket is that, the squeezer  7 ′ can be directly disposed on the mop bucket. Specifically, two ends of the squeezer  7 ′ are directly inserted into two side surfaces of the mop bucket so that the squeezer  7 ′ is directly connected to the mop bucket. 
     Embodiment 14 of the Mop Bucket of the Present Invention 
       FIG. 44 - FIG. 45  show a fourteenth embodiment of the mop bucket for cleaning and squeezing a flat mop. The differences between this embodiment and Embodiment 12 of the mop bucket is that, the structure of the cleaner is different and the manner for moving the cleaner  14 ′ up and down is different (that is, the cleaner  14 ′ is driven to move up and down by the mop head  4 ). Specifically, the cleaner  14 ′ comprises a first frame  21 ′, a second frame  22 ′ and a third frame  23 ′ between the first frame  21 ′ and the second frame  22 ′, which are separate from each other; a cleaning component  20 ′ is disposed on the first frame  21 ′ (or the second frame  22 ′). In this embodiment, the cleaning component may be brush bristle, soft rubber, a scraper or the like. A first rod  24 ′ is hinged at two ends of the first frame  21 ′, a second rod  25 ′ is hinged at two ends of the second frame  22 ′, and a third rod  26 ′ close to the first frame  21 ′ and a fourth rod  27 ′ close to the second frame  22 ′ are hinged at two ends of the third frame  23 ′; the first rod  24 ′ and the third rod  26 ′ are hinged at their lower ends, and the second rod  25 ′ and the fourth rod  27 ′ are hinged at their lower ends; during cleaning, a force is applied after the mop head  4  is aligned with the third frame  23 ′, so that the first frame  21 ′ and the second frame  22 ′ can move upward; and, when the mop head  4  is pulled back, the first frame  21 ′ and the second frame  22 ′ are moved down automatically, so that the wiper is cleaned by the cleaning component  20 ′. 
     In practical applications, the mop head  4  is pressed down to drive the cleaner  14 ′ to ascend; and, when the mop head  4  is pulled back, the cleaner  14 ′ is driven to descend, so that the relative movement between the cleaner and the mop head  4  is realized. 
     Embodiment 15 of the Mop Bucket of the Present Invention 
       FIG. 46  shows a fifteenth embodiment of the mop bucket for cleaning and squeezing a flat mop. The difference between this embodiment and Embodiment 14 of the mop bucket is that, the cleaner is connected to a gear-rack mechanism which is driven by the mop head to move the cleaner up and down. Specifically, the gear-rack mechanism comprises a vertical driving rack  28 ′ which is connected to the bottom of the mop bucket via a spring  29 ′ and a vertical driven gear  30 ′; a gear  31 ′ positioned within the mop bucket is disposed between the driven rack  30 ′ and the driving rack  28 ′; the gear  31 ′ is engaged with the driving rack  28 ′ and the driven rack  30 ′, respectively; a cleaning component is disposed on a surface of the driven rack  30 ′ having teeth formed thereon; the mop head  4  is aligned with the driving rack  28 ′ after it is pressed down, so that the driving rack  28 ′ is pressed down while the driven rack  30 ′ is moved up, and the wiper is cleaned by the cleaning component; when the mop head  4  is pulled back, the driving rack  28 ′ and the driven rack  30 ′ return to the original position, and the wiper is cleaned again by the cleaning component. 
     Embodiment 16 of the Mop Bucket of the Present Invention 
       FIG. 47  shows a sixteenth preferred embodiment of the mop bucket of the present invention. The mop bucket comprises a bucket body  1 , a flat mop  2  used together with the mop bucket comprises a mop rod  3  and a mop head  4  rotatably attached to the mop rod  3 , and a wiper is disposed on the mop head  4 , as shown in  FIG. 33 . 
     The bucket body  1  has an independent cleaning section  6  and an independent squeezing water section  5  which are physically separated with each other inside the bucket body  1 . A squeezing device  7  is disposed in the squeezing water section  5 , and a cleaning device for cleaning the wiper is disposed in the cleaning section  6 . The independent squeezing water section  5  and the independent cleaning section  6  mean that the bucket body  1  is physically divided into two separated volumes, which are not communicated with each other, one volume defined as the cleaning section  6 , and another volume defined as the squeezing water section  5 . 
     The squeezing device comprises a squeezer  7 ″ for squeezing the wiper on the mop head and a first support opposite to the squeezer  7 ″; the squeezer  7 ″ is directly or indirectly disposed on the bucket body  1 , and the first support is directly disposed on the bucket body  1 ; the space between the squeezer  7 ″ and the first support is defined as a squeezing space; during squeezing, the mop head  4  is switched to the squeezing state, when the mop head  4  is inserted into the squeezing space, the wiper on the mop head  4  can move relatively to the squeezer  7 ″ and be squeezed by the squeezer  7 ″. Switching the mop head  4  to the squeezing state generally is rotating the mop head  4  to be parallel to or approximately parallel to the mop rod  3 , so that the mop head  4  can be smoothly moved up and down in the squeezing space for squeezing. The specific shape and structure of the squeezer  7 ″ can be in various forms. For example, the squeezer  4  is a squeezing roller, a squeezing sheet, a squeezing plate or the like. 
     The squeezer  7 ″ can be directly disposed on the mop bucket. For example,  FIG. 47  shows a first kind of squeezing device, where two ends of the squeezer  7 ″ are directly inserted two side surfaces of the bucket body  1  and the squeezer  7 ″ is directly connected to the bucket body  1 . The squeezer  7 ″ can also be indirectly disposed on the bucket body  1 . For example,  FIG. 48 - FIG. 52  show a second kind to sixth kind of squeezing devices, where the squeezer  7 ″ is disposed on a frame  8 ″ and the frame  8 ″ is then disposed on the bucket body  1 . 
     The specific structure of the first support will not be limited as long as the first support can support and position the mop head  4  inserted into the squeezing layer. For example,  FIG. 48  shows a second kind of squeezing device, where the first support is a pair of support ribs  9 ″ longitudinally extending from an end surface of the bucket body  1 ;  FIG. 49  shows a third kind of squeezing device, where the first support is a pair of support ribs  9 ″ transversely extending from a side surface of the bucket body  1 ;  FIG. 51  shows a fifth kind of squeezing device, where the first support is a pair of support frames  10 ″ longitudinally extending from an end surface of the bucket body  1 , with a roller  11 ″ being disposed at a tail end of each of the support frames  10 ″;  FIG. 52  shows a sixth kind of squeezing device, where the first support is a pair of support frames  10 ″ transversely extending from a side surface of the bucket body  1 , with a roller  11 ″ being disposed at a tail end of each of the support frames  10 ″; or, the first support is the wall of the mop bucket opposite to the squeezer  7 ″. When the mop head  4  is inserted into the squeezing space for squeezing, the first support functions to support and position the mop head  4  so as to prevent the mop head  4  from warping or skewing during squeezing. It is to be noted that, when the first support mechanism is used, the first support will not always be in contact with the mop head during squeezing. 
     Or,  FIG. 50  shows a fourth kind of squeezing device, where the first support is a pair of guide plates  12 ″ transversely extending from a side surface of the bucket body  1 , and guide slots are formed on two sides of the flow mop head. When the mop head  4  is inserted into the squeezing space, the pair of guide plates  12 ″ are inserted into the guide slots so as to support and position the mop head  4 . 
     In this embodiment, in order to prevent the wrung water from retaining in the squeezing water section  5 , a water flow device for transferring water in the squeezing water section  5  to the cleaning section  6  is disposed within the squeezing water section  5 . The water flow device can be an existing water pumping device which directly pumps water on the bottom of the squeezing water section to the cleaning section. In this embodiment, the water flow device is a water flow passenger  13 ″ communicating the squeezing water section  5  and the cleaning section  6 , and the water flow passenger  13 ″ is disposed over the squeezing water section  5  and the cleaning section  6 . As shown in  FIG. 48 - FIG. 52 , when the squeezer  7 ″ is disposed on the frame  8 ″, the water flow passenger  13 ″ can be directly disposed on the frame  8 ″; and, when the squeezer  7 ″ is directly disposed on the mop bucket, the water flow passenger  13 ″ can be disposed in other ways. 
     The cleaning device comprises a cleaner  14 ″ for squeezing and scraping the wiper on the mop head  4  and a second support opposite to the cleaner  14 ″; the cleaner  14 ″ is directly or indirectly disposed on the bucket body  1 , and the second support is directly disposed on the bucket body  1 ; the space between the cleaner  14 ″ and the second support is defined as a cleaning space; and, During cleaning, the mop head  4  is switched to the cleaning state, when the mop head  4  is inserted into the cleaning space, the wiper on the mop head  4  can move relatively to the cleaner  14 ″ and be squeezed by the cleaner  14 ″. 
     Switching the mop head  4  to the cleaning state generally is rotating the mop head  4  to be parallel to or approximately parallel to the mop rod  3 , so that the mop head  4  can be smoothly moved up and down in the cleaning interlayer for squeezing. The specific shape and structure of the cleaner  14 ″ can be in various forms. For example, the cleaner  14 ″ is a cleaning scraper, a cleaning brush, cleaning teeth or soft cleaning rubber. 
     The cleaner  14 ″ can be directly disposed on the bucket body  1 . For example, the cleaner is a cleaning scraper. Two ends of the cleaner are directly inserted into two side surfaces of the mop bucket, and the cleaner is directly connected to the mop bucket. Or, when the cleaner is a cleaning brush, cleaning teeth, soft cleaning rubber or in other structures, the cleaning brush, the cleaning teeth, the soft cleaning rubber and the like can be directly disposed on the wall of the mop bucket. 
     The cleaner  14 ″ can also be indirectly disposed on the bucket body  1 . For example,  FIG. 53 - FIG. 58  show a first kind to sixth kind of cleaning devices, where the cleaner  14 ″ is disposed on a cleaning frame  15 ″ and the cleaning frame  15 ″ is then disposed on the bucket body  1 . 
     The specific structure of the second support will not be limited as long as the second support can support and position the mop head  4  inserted into the squeezing layer. For example,  FIG. 53  shows a first kind of cleaning device, where the second support is a pair of support ribs  9 ″ longitudinally extending from an end surface of the bucket body  1 ;  FIG. 54  shows a second kind of cleaning device, where the second support is a pair of support ribs  9 ″ transversely extending from a side surface of the bucket body  1 ;  FIG. 56  shows a fourth kind of cleaning device, where the second support is a pair of support frames  10 ″ longitudinally extending from an end surface of the bucket body  1 , with a roller  11 ″ being disposed at a tail end of each of the support frames  10 ″;  FIG. 57  shows a fifth kind of cleaning device, where the second support is a pair of support frames  10 ″ transversely extending from a side surface of the bucket body  1 , with a roller  11 ″ being disposed on each of the support frames  10 ″;  FIG. 58  shows a sixth kind of cleaning device, where the second support is a pair of support frames  10 ″ longitudinally extending from an end surface of the bucket body, with a pair of springs  16 ″ and a pair of elastic blocks  17 ″ being disposed in each of the support frames  10 ″, the springs  16 ″ acting on the elastic blocks  17 ″ to allow portions of the elastic blocks  17 ″ to rebound from the tail end of the support frames  10 ″; or, the second support is the wall of the mop bucket opposite to the cleaner  14 ″. When the mop head  4  is inserted into the cleaning interlayer for cleaning, the second support functions to support and position the mop head  4  so as to prevent the mop head  4  from warping or skewing during cleaning. It is to be noted that, when the second support mechanism is used, the second support will not always be in contact with the mop head  4  during cleaning. 
     Or,  FIG. 55  shows a third kind of cleaning device, where the second support is a pair of guide plates  12 ″ transversely extending from a side surface of the bucket body  1 , and guide slots are formed on two sides of the flow mop head  4 . When the mop head  4  is inserted into the cleaning interlayer, the pair of guide plates  12 ″ are inserted into the guide slots so as to support and position the mop head  4 .