Patent Publication Number: US-2023142514-A1

Title: Dredging device

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation application to PCT/CN2021/115077, having a filing date of Aug. 27, 2021, which claims priority to Chinese Application No. 202110606965.5, having a filing date of Jun. 01, 2021, the entire contents both of which are incorporated herein by reference. 
    
    
     FIELD OF TECHNOLOGY 
     The following relates to the field of coal-fired power plants, in particular to a dredging device. 
     BACKGROUND 
     In the conventional art, for a boiler of a coal-fired power plant, when coal is poured into a coal hopper, a coal dropping pipe may sometimes be blocked due to excessive coal or debris entering the coal dropping pipe. At the same time, the coal dropping pipe is easy to be blocked because the coal is too moist and the coal is highly viscous, which causes the coal to easily stick to the coal dropping pipe, and the existed common method for the blocked coal dropping pipe is to use an air cannon to open the coal pipe, or beat it manually, which is very inconvenient, and a faster and more stable way is needed to solve the existing deficiencies. 
     SUMMARY 
     An aspect relates to a dredging device, which can be used for dredging coal blocking of a coal dropping pipe of coal-fired power plants. 
     To achieve the above purpose, a technical solution adopted by the present disclosure is: 
     a dredging device for dredging a pipe, comprising:   a carrying frame, adapted to connected to the pipe;   a shaking dredging unit, comprising a first shaking plate and a second shaking plate adapted to be arranged within the pipe;   a driving unit, connected to the carrying frame;   wherein, the driving unit is connected to the first shaking plate and the second shaking plate for driving the first shaking plate and the second shaking plate to reciprocate to approach or move away from each other.   

     The present disclosure can be arranged on the pipe, and dredge by shaking the dredging unit, during a coal dropping process, the first shaking plate and the second shaking plate approach or move away from each other and reciprocate, the reciprocating motion of the two shaking plates in the pipe can cause the movement of the coal when falling be more violent, so that the coal cannot fall slowly and stick to the pipe, thus reduce the possibility of coal blocking the pipe. 
     Another technical solution adopted by the present disclosure is: 
     a dredging device comprising a carrying frame, a shaking dredging unit, a stirring dredging unit, and a driving unit,   wherein, the carrying frame is connected to a pipe;   the shaking dredging unit comprises a first shaking plate and a second shaking plate, the first shaking plate and the second shaking plate are adapted to be arranged within the pipe, and the driving unit is connected to the first shaking plate and the second shaking plate;   the stirring dredging unit comprises a turntable assembly and a stirring rod, the turntable assembly and the stirring rod are adapted to be arranged within the pipe, the turntable assembly is rotatably connected to the carrying frame, the stirring rod is connected to the turntable assembly, and the driving unit is connected to the turntable assembly;   the driving unit is connected to the carrying frame, and simultaneously drives the first shaking plate and the second shaking plate to reciprocate to approach or move away from each other, and the turntable assembly and the stirring rod to rotate;   the driving unit comprises a driving member, a shaking transmission assembly and a stirring transmission assembly,   the shaking transmission assembly comprises a rack, a gear engaged with the rack, a shaking transmission rod and a pull rod, an output end of the driving member is connected to the rack to drive the rack to translate along its extension direction, and one end portion of the shaking transmission rod is rotatably connected to the carrying frame and is coaxially connected with the gear, the other end portion of the shaking transmission rod is rotatably connected with one end portion of the pull rod, and the other end portion of the pull rod is connected with the first shaking plate or the second shaking plate;   the stirring transmission assembly comprises a stirring transmission rod and a stirring rotation rod, an output end of the driving unit is rotatably connected with one end portion of the stirring transmission rod, and the other end portion of the stirring transmission rod is rotatably connected with the stirring rotation rod, the stirring rotation rod is fixedly connected with the turntable assembly, the stirring transmission rod is relatively perpendicular to the rotating shaft of the turntable assembly, and the stirring rotation rod is parallel to the rotating shaft of the turntable assembly.   

     The present disclosure can be arranged on the pipe, and dredge by shaking and stirring the dredging unit, the reciprocating motion of the two shaking plates in the pipe can cause the movement of the coal when falling be more violent, so that the coal cannot fall slowly and stick to the pipe; the rotation of the stirring rod can break up larger pieces of coal to make it fall smoothly, reducing the possibility of coal blocking the pipe. The present disclosure can be used on various pipes, which is easy to install, has a high degree of dredging automation, and effectively ensures a well dredging of pipes. 
    
    
     
       BRIEF DESCRIPTION 
       Some of the embodiments will be described in detail, with references to the following Figures, wherein like designations denote like members, wherein: 
         FIG.  1    is a three-dimensional schematic diagram of the device in an embodiment installed on a pipe; 
         FIG.  2    is a three-dimensional schematic diagram of the device in an embodiment removed from the pipe; 
         FIG.  3    is an enlarged schematic diagram of Part A in  FIG.  2   ; 
         FIG.  4    is a front view of the device in an embodiment installed on the pipe; 
         FIG.  5    is a cross-sectional view in the B-B direction in  FIG.  4   ; 
         FIG.  6    is a side view of the device in an embodiment installed on the pipe; 
         FIG.  7    is a cross-sectional view in the C-C direction in  FIG.  6   ; and 
         FIG.  8    is a cross-sectional view in the D-D direction in  FIG.  6   . 
     
    
    
     DETAILED DESCRIPTION 
     In the following, the technical solutions of the present disclosure are described clearly and completely in conjunction with the accompanying drawings, and apparently, the described embodiments are merely a part of the embodiments of the present disclosure, not all the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by one of ordinary skill in the conventional art without creative work should fall within the protective scope of the present disclosure. 
     As shown in  FIGS.  1 ,  2 ,  4  and  6   , a dredging device for dredging a pipe  1 , especially for dredging a coal blocking of a coal dropping pipe of the coal-fired power plant. In this embodiment, the pipe  1  takes the coal dropping pipe as an example, and the cross section of the coal dropping pipe is square. However, the device is not only limited to the coal dropping pipe, but can also be used for other pipe  1  which is easily blocked by coal, such as a pipe  1  for a coal hopper and a coal bunker. 
     The device comprises a carrying frame  9 , a shaking dredging unit, a stirring dredging unit, a driving unit and a sealing cover  8 , etc. The shaking dredging unit causes the coal blockage fall off by shaking and then dredges the pipe  1 , and the stirring dredging unit causes the coal blockage fall off by stirring the coal blockage and then dredges the pipe  1 , the driving unit is to drive the shaking dredging unit to shake and/or to drive the stirring dredging unit to stir. The carrying frame  9  is arranged on the pipe  1  to connect the device to the pipe  1 , and the carrying frame  9  can be arranged within the pipe  1  or outside the pipe  1 , the stirring dredging unit and the driving unit are connected to the carrying frame  9 , and the shaking dredging unit and the stirring dredging unit are arranged within the pipe  1 . In this embodiment, the carrying frame  9  is installed on the out wall of the pipe  1 . The sealing cover  8  covers the carrying frame  9  and the driving unit inside. 
     As shown in  FIGS.  3  and  8   , the driving unit comprises a driving member  4 , a shaking transmission assembly and a stirring transmission assembly. An output end of the driving member  4  is provided with a connecting block  41 , and the connecting block  41  has a plurality of ends  410  respectively connected to the respective shaking transmission assembly and stirring transmission assembly, the driving member  4  drives the shaking dredging unit to act through the shaking transmission assembly, and the driving member  4  drives the stirring dredging unit to act through the stirring transmission assembly. The driving member  4  is provided with a push rod  411   reciprocating with respect to the pipe  1 , the connecting block  41  is arranged at the end portion of the push rod  411  and reciprocates on a straight line to go close to or away from the pipe  1  under the action of the push rod  411 , and the driving part  4  is driven by electric or hydraulic pressure, that is, the driving member  4  may be a motor or a hydraulic cylinder or the like. The driving unit simultaneously drives the shaking dredging unit and the stirring dredging unit to perform the dredging work. 
     As shown in  FIGS.  3  and  5   , the shaking dredging unit is connected with the driving member  4  through the shaking transmission assembly, and the shaking dredging unit comprises a first shaking plate  21  and a second shaking plate  22 , the first shaking plate  21  and the second shaking plate  22  are respectively connected with the connecting block  41  on the output ends of the driving member  4  through a set of shaking transmission assemblies, and the shaking transmission assemblies are located symmetrically on two sides of the pipe  1 , respectively. When used in the pipe  1 , the first shaking plate  21  and the second shaking plate  22  are arranged opposite to each other, and the first shaking plate  21  and the second shaking plate  22  are simultaneously driven by the driving member  4  to reciprocate to approach or move away from each other. Each of the first shaking plate  21  and the second shaking plate  22  comprises an inclined plate  23  and a straight plate  24  which are integrally provided, two sides of the inclined plates  23  are the straight plates  24  that are parallel to each other, the extension direction of the straight plates  24  is consistent with the extension direction of the coal dropping pipe  1 , and in the coal dropping pipe  1 , the inclined plate  23  is inclined from top to bottom in a direction away from the inner wall of the pipe, as shown in  FIG.  5   . 
     The shaking transmission assembly comprises a rack  51 , a rack draw rod  52 , a gear  53  engaged with the rack  51 , a shaking transmission rod  54 , a pull rod  55 , and a hinge block  56 . One end portion of the rack draw rod  52  is rotatably connected to the connecting block  41  at one of the output ends of the driving member  4 , and the other end portion is rotatably connected to the rack  51 , as shown in  FIG.  3   . In this embodiment, the rack draw rod  52  is two relatively parallel rods, the connecting block  41  at one of the output ends of the driving member  4  is connected between the two rack draw rods  52 , and the rack  51  is also connected between the two rack draw rods  52 , so that the transmission connection drives the rack  51  to translate along the its extension direction. In this embodiment, the shaking transmission rod  54  is also two relatively parallel rods, one end portion of each of the two shaking transmission rods  54  is rotatably connected to the carrying frame  9  and is coaxially connected to the gear  53  (the rotating shafts between the shaking transmission rods  54  and the carrying frame  9 , the gear  53  is rotatably connected to the carrying frame  9 ), the other end portion of each of the shaking transmission rods  54  is rotatably connected with one end portion of the hinge block  56 , the other end portion of the hinge block  56  is rotatably connected with one end portion of the pull rod  55 , and the other end portion of the pull rod  55  is fixedly connected to the first shaking plate  21  or the second shaking plate  22 . The pipe  1  is provided with a hole through which the other end portion of the pull rod  55  is connected to the first shaking plate  21  or the second shaking plate  22 , and specifically may be connected to the inclined plate of the first shaking plate  21  or the second shaking plate  22 . 
     The carrying frame  9  is provided with a guide rail  57  and a guide slider  58  slidably arranged on the guide rail  57 , and the rack  51  is connected to the guide slider  58 , so that the rack  51  can connected more firmly, and the rack  51  can be limited and guided. In use: the connecting block  41  reciprocates in a straight line to drive the rack  51  to move, the rack  51  cooperates with and drives the gear  53  to rotate, and the gear  53  drives the shaking transmission rods  54  to rotate or swing to drive the pull rod  55  to move, so that the first shaking plate  21  and the second shaking plate  22  reciprocate to approach or move away from each other. 
     As shown in  FIGS.  1 ,  2 ,  5 , and  7   , the device further comprises a shaking guide assembly, the shaking guide assembly is connected to the inner wall surface of the pipe  1 , and the first shaking plate  21  and the second shaking plate  22  are respectively connected to the shaking guide assembly, each shaking plate can be provided with a plurality of shaking guide assemblies, the shaking guide assemblies are arranged at the corners of each shaking plate, and the first shaking plate  21  and the second shaking plate  22  maintain their reciprocating paths through the shaking guide assemblies. The shaking guide assembly comprises a guide rod  71  and a limit block  72 , one end of the guide rod  71  is connected to the inner wall surface of the pipe  1  and the other end portion is provided with a limit block  72 , the limit block  72  is threaded mounted on the guide rod  71  to facilitate subsequent cleaning and maintenance. The driving unit drives the first shaking plate  21  and the second shaking plate  22  to move within the range from one end portion to the other end portion of the guide rod  71 , so as to guide and limit the movement of the first shaking plate  21  and the second shaking plate  22 . The length of the guide rod  71  should not be too long, that is, the shaking amplitude of the shaking plates is not enough to make the coal drop between the shaking plates and the coal dropping pipe. 
     As shown in  FIGS.  5 ,  7 , and  8   , the stirring dredging unit is connected with the driving member  4  through the stirring transmission assembly, the stirring dredging unit comprises a turntable assembly and a stirring rod  31 , the turntable assembly is rotatably connected to the carrying frame  9 , the stirring rod  31  is fixedly connected to the turntable assembly, the turntable assembly and the stirring rod  31  are arranged within the pipe  1 , and the extension direction of the stirring rod  31  is consistent with the extension direction of the pipe  1  (in this embodiment, the stirring rod  31  extends toward the opening of the pipe  1  for material dropping), the driving member  4  drives the turntable assembly and the stirring rod  31  to rotate under the transmission of the stirring transmission assembly, the rotation of the stirring rod  31  can prevent the coal from blocking the pipe  1  when the coal drops, and at the same time, because the turntable assembly is rotating all the time, it is also possible to avoid coal dropping on the turntable assembly as much as possible. When in use, a slot is formed on the pipe  1  to facilitate the carrying frame  9  and the stirring transmission assembly inserting into the pipe  1 , and the size of the slot is not enough to cause the coal inside the pipe  1  fall out from the slot. 
     The stirring transmission assembly comprises a stirring transmission rod  61  and a stirring rotation rod  62 , one end portion of the stirring transmission rod  61  is rotatably connected with the connecting block  41  as the output end of the driving unit and the other end portion inserts into the pipe  1  and is rotatably connected with the stirring rotation rod  62 , the stirring rotation rod  62  is fixedly connected with the turntable assembly, the stirring transmission rod  61  is relatively perpendicular to the rotating shaft between the turntable assembly and the carrying frame  9 , the stirring rotating rod  62  is parallel to the rotation shaft o between the turntable assembly and the bearing frame  9  and all extend in the up-down direction, one output end of the driving member  4  moves reciprocatingly in a straight line to pull the stirring transmission rod  61  to swing, thereby driving the stirring rotation rod  62  to rotate around the rotation shaft of the turntable assembly, and the stirring transmission rod  61  is equivalent to a swing arm pulling the turntable assembly to rotate around the rotation shaft o, that is, the stirring rotation rod  62  is eccentrically arranged relative to the rotation shaft o of the turntable assembly, and the stirring rotation rod  62  does not coincide with the rotation shaft of the turntable assembly. 
     The turntable assembly comprises a first turntable  32  and a second turntable  33  that rotate coaxially, the first turntable  32  and the second turntable  33  are connected to the stirring transmission rod  61  through the stirring rotation rod  62  in a transmission manner, the first turntable  32  may be rotatably connected to the carrying frame  9  via the rotation shaft o, and the stirring rod  31  is connected to the second turntable  33 . 
     The stirring dredging unit further comprises a stirring rod position adjustment assembly for adjusting the position of the stirring rod  31  on the second turntable  33 . The stirring rod position adjustment assembly comprises an adjusting slide rail  34 , an adjusting slider  35 , and an adjusting driving member  36 . In this embodiment, the stirring rod position adjustment assembly is arranged on the second turntable  33 , and can also be arranged on the first turntable  32  in practical applications. The adjusting slide rail  34  is arranged on the second turntable  33 , the adjusting slider  35  is slidably arranged on the adjusting slide rail  34 , and the adjusting slider  35  is connected with the stirring rod  31 . As shown in  FIG.  3   , the stirring rod  31  is arranged on the adjusting slider  35 , and the movement of the adjusting slider  35  drives the stirring rod  31  to move together, according to different coal dropping speeds or coal types, the radius of the stirring rod  31  rotating around the rotation shaft of the turntable assembly is changed to adjust the magnitude of the eccentric stirring of the stirring rod  31 . Specifically, the second turntable  33  is provided with a limit slot  331 , and the adjusting slide rail  34  is arranged in the limit slot  331 , and the stirring rod  31  may also pass through the limit slot  331  to connect and cooperate with the first turntable  32 , the first turntable  32  plays the role of driving the stirring rod  31  to rotate, and the second turntable  33  plays the role of stabilizing the connection of the stirring rod  31 . The adjusting driving member  36  is connected with the adjusting slider  35  for driving the adjusting slider  35  to move on the adjusting slide rail  34 , the output end of the adjusting driving member  36  has a threaded rod, and the threaded rod extends along the length direction of the adjusting slide rail  34  and penetrates through the adjusting slider  35 , the rotation of the threaded rod moves the adjusting slider  35  threaded matched with the threaded rod, thereby adjusting the position of the stirring rod  31 , and a motor can be used for the adjusting driving member  36 . A protective shell is connected to the turntable assembly, and the protective shell covers the outer side of the adjusting driving member  36  to prevent the adjusting driving member  36  from being damaged by falling coal. 
     In this embodiment, the rotational connections are all in the form of hinges. 
     The working principle of this embodiment is described in detail below: 
     As shown in  FIGS.  2 ,  3  and  8   , the dredging device is installed on the coal dropping pipe through the carrying frame  9 , and during operation: the driving member  4  drives the connecting block  41  to reciprocate along a straight line, and the connecting block  41  drives the rack draw rod  52  and the stirring transmission rod  61  to swing, the rack draw rod  52  drives the rack  51  to move to control the gear  53  to rotate, the gear  53  rotates to drive the shaking transmission rod  54  to swing, the shaking transmission rod  54  drives the pull rod  55  to reciprocate in a straight line through the cooperation of the hinge block  56 , and finally move the first shaking plate  21  and the second shaking plate  22  under the restriction of the guide rod  71 ; the stirring transmission rod  61  pulls the first turntable  32  and the second turntable  33  to rotate coaxially through the stirring rotation rod  62 , and the stirring rod  31  is driven by the first turntable  32  and the second turntable  33  to stir around the shaft axis o of the turntable assembly, and according to the different blocking conditions, the stirring force is changed by controlling the eccentricity of the stirring rod  31  by the stirring adjustment assembly. 
     Although the present invention has been disclosed in the form of embodiments and variations thereon, it will be understood that numerous additional modifications and variations could be made thereto without departing from the scope of the invention. 
     For the sake of clarity, it is to be understood that the use of ‘a’ or ‘an’ throughout this application does not exclude a plurality, and ‘comprising’ does not exclude other steps or elements.