Patent Publication Number: US-11376710-B2

Title: Cyclone dust collecting device and grinding device

Description:
RELATED APPLICATION INFORMATION 
     This application claims the benefit under 35 U.S.C. § 119(a) of Chinese Patent Application No. CN 202010610476.2, filed on Jun. 29, 2020, and Chinese Patent Application No. CN 202021237149.9, filed on Jun. 29, 2020, which are incorporated by reference in their entirety herein. 
     BACKGROUND 
     Dust is generated when an electric tool (such as a grinding device) is used to process a workpiece. The dust not only pollutes the air but also exposes an operator to a dust environment. Therefore, the electric tool is typically equipped with a dust collecting device. 
     The electric tool is typically provided with the dust collecting device. The dust collecting device is typically provided with a dust separating part. The dust is left in the dust collecting device after being separated by the dust separating part, and a dust exhaust airflow is discharged out of the device. Therefore, when the dust is accumulated to an outlet of the dust separating part, the dust flies out of a dust collecting box along with the dust exhaust airflow. At this time, the dust collecting box is unable to effectively store the dust, and the dust in the dust collecting device needs to be dumped so as to ensure continuous dust collection. However, the dust separating part of the dust collecting device is typically disposed along an axial direction of a dust inlet in the existing art. Therefore, a space in the dust collecting device cannot be effectively utilized, and the frequency of dust dumping of a user is increased, which is not conducive to improving use feeling of the user. 
     SUMMARY 
     A cyclone dust collecting device includes a dust collecting box including a dust entrance and a cavity formed by extension in a first direction, wherein the dust entrance communicates with a dust exhaust channel of a host machine, and a dust exhaust airflow enters the cavity through the dust entrance; and a separator including a dust inlet and a cyclone tube, wherein the dust inlet communicates with the dust entrance, the dust inlet is configured to guide the dust exhaust airflow into the cyclone tube, the cyclone tube extends in a second direction and is at least partially disposed in the dust collecting box, the cyclone tube includes a dust outlet and an air outlet disposed on the cyclone tube, the dust outlet is located in the cavity, and the air outlet communicates with an outside of the dust collecting box. The second direction obliquely intersects the first direction such that the dust outlet is higher than the dust inlet and the air outlet is lower than the dust inlet. 
     In one example, a vertical distance between a top wall and a bottom wall of the dust collecting box is H, the cyclone tube has a central axis, and a vertical distance between the central axis at the dust inlet and the bottom wall of the dust collecting box is h, wherein 0.5≤h/H≤0.9. 
     In one example, the first direction and the second direction obliquely intersect each other in a vertical plane and have an included angle in between, and the included angle is greater than or equal to 15° and less than or equal to 45°. 
     In one example, the cyclone tube includes a guide piece disposed at the air outlet, and the guide piece is configured to guide an air-out direction at the air outlet to deviate toward a direction away from the host machine with respect to the second direction. 
     In one example, the dust collecting box further includes an end cover and a dust cylinder which are detachably connected to each other, the end cover is detachably connected to the host machine, the cavity is formed in the dust cylinder, and the dust inlet is formed on the end cover. 
     In one example, the dust collecting box further includes a dust blocking piece, the dust cylinder is provided with an opening facing the host machine, and the dust blocking piece is disposed on a bottom wall at the opening of the dust cylinder. 
     In one example, the cyclone dust collecting device further includes a mounting structure disposed between the end cover and the dust cylinder, and the dust cylinder and the end cover are detachably connected to each other through the mounting structure. 
     In one example, the mounting structure includes an elastic buckle, and two elastic buckles are provided and disposed on opposite two sides of the dust cylinder. 
     In one example, the elastic buckle includes an elastic arm disposed on the dust cylinder, wherein the elastic arm is provided with a protrusion portion; and a claw disposed on the end cover, wherein the claw is provided with a groove which is fitted with the protrusion portion for locking. 
     In one example, the mounting structure includes a limiting protrusion disposed on the end cover; and a rotation buckle disposed on the dust cylinder, the rotation buckle is pivotally connected to the dust cylinder, the rotation buckle includes a hook portion and a biasing member, and the biasing member is configured to apply, to the hook portion, a biasing force which enables the hook portion to be fitted with the limiting protrusion for locking. 
     In one example, the dust collecting box includes a second joint for connecting a first joint of the host machine, and the second joint is detachably connected to the first joint through a locking member. 
     In one example, the locking member includes a first locking member disposed on one of the first joint and the second joint, wherein the first locking member is a protrusion radially protruding from the one of the first joint and the second joint; and a second locking member disposed on an outer periphery of the other joint of the first joint and the second joint, wherein the second locking member includes a sliding groove which is suitable for entry and locking of the first locking member, the sliding groove includes a guide groove and a locking groove, the guide groove is disposed obliquely with respect to an axis of the other joint, and the locking groove is disposed at an end of the guide groove and configured to restrict the first locking member from disengaging from the locking groove. 
     In one example, the guide groove is an arc groove, two protrusions and two sliding grooves are provided, the two protrusions are symmetrically disposed about an axis of the first joint, and the two sliding grooves are respectively disposed on opposite two sides of an outer periphery of the second joint. 
     In one example, the cyclone dust collecting device further includes an auxiliary disengaging member, the auxiliary disengaging member is sandwiched between the first joint and the second joint and has a biasing force applied to the second joint to disengage the second joint from the first joint, the second joint is sleeved on the first joint, the auxiliary disengaging member is an elastic cushion, and the elastic cushion engages with an inner wall of the second joint. 
     In one example, the dust collecting box further includes an end cover and a dust cylinder, the dust cylinder is provided with a top wall and a bottom wall, the second direction is arranged obliquely relative to the top wall, and the second direction is also arranged obliquely relative to the bottom wall. 
     A cyclone dust collecting device includes a dust collecting box including a dust entrance and a cavity formed by extension in a first direction, wherein the dust entrance communicates with a dust exhaust channel of a host machine, and a dust exhaust airflow enters the cavity through the dust entrance; and a separator including a dust inlet and a cyclone tube, wherein the dust inlet communicates with the dust entrance, the dust inlet is configured to guide the dust exhaust airflow into the cyclone tube, the cyclone tube extends in a second direction and is at least partially disposed in the dust collecting box, the cyclone tube includes a dust outlet and an air outlet disposed on the cyclone tube, the dust outlet is located in the cavity, and the air outlet communicates with an outside of the dust collecting box. The second direction obliquely intersects the first direction. 
     A grinding device includes a body including a dust exhaust channel; a baseplate assembly including a baseplate for mounting a grinding member; a driving mechanism disposed in the body, wherein the driving mechanism is configured to drive the baseplate assembly to move; a fan assembly is configured to form a dust exhaust air path; and a cyclone dust collecting device. The cyclone dust collecting device includes a dust collecting box including a dust entrance and a cavity formed by extension in a first direction, wherein the dust entrance communicates with the dust exhaust channel, and the dust exhaust airflow enters the cavity through the dust entrance; and a separator including a dust inlet and a cyclone tube, wherein the dust inlet communicates with the dust entrance, the dust inlet is configured to guide the dust exhaust airflow into the cyclone tube, the cyclone tube extends in a second direction and is at least partially disposed in the dust collecting box, the cyclone tube includes a dust outlet and an air outlet, the dust outlet is located in the cavity, and the air outlet communicates with an outside of the dust collecting box. The second direction obliquely intersects the first direction such that the dust outlet is higher than the dust inlet and the air outlet is lower than the dust inlet. 
     In one example, a vertical distance between a top wall and a bottom wall of the dust collecting box is H, the cyclone tube has a central axis, and a vertical distance between the central axis at the dust inlet and the bottom wall of the dust collecting box is h, wherein 0.5≤h/H≤0.9. 
     In one example, the included angle exists between the first direction and the second direction in a vertical plane, and the included angle is greater than or equal to 15° and less than or equal to 45°. 
     In one example, the dust collecting box further includes an end cover and a dust cylinder, the dust cylinder further includes a dust blocking piece, the dust cylinder is provided with an opening facing the body, and the dust blocking piece is disposed on a bottom wall at the opening of the dust cylinder. 
     In the cyclone dust collecting device provided by the present disclosure, an included angle exists between the second direction and the first direction such that the inlet is higher than the dust inlet and the outlet is lower than the dust inlet. Therefore, the cyclone is obliquely disposed in the dust collecting box, a size of the dust collecting box in the axial direction is reduced, and the internal structure of the dust collecting box is more compact. The dust flows upward from the dust inlet and enters the dust collecting box at the inlet and accumulates in the dust collecting box. Since the inlet of the cyclone is raised, an effective dust accumulation space below an end portion is increased, and the dust collection space is increased without increasing a volume of the dust collecting box. In this manner, the dust collecting efficiency is higher, and the frequency of dust dumping of a user is reduced. At the same time, the outlet is disposed facing away from the host machine so that the dust exhaust airflow is prevented from blowing to the host machine and part of the dust that has not been effectively collected is prevented from blowing to the body along with the outlet of the separator. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a structure view of a sander according to the present disclosure; 
         FIG. 2  is a sectional view of a part of the sander of  FIG. 1 ; 
         FIG. 3  is an exploded view of a cyclone dust collecting device of the sander of  FIG. 1 ; 
         FIG. 4  is a structure view of a separator of  FIG. 3 ; 
         FIG. 5  is a bottom view of the separator of  FIG. 4 ; 
         FIG. 6  is a sectional view of a cyclone tube of  FIG. 5 ; 
         FIG. 7  is a structure view of an end cover of  FIG. 3 ; 
         FIG. 8  is a structure view of a dust cylinder of  FIG. 3 ; 
         FIG. 9  is a structure view of a sander including another cyclone dust collecting device according to the present disclosure; 
         FIG. 10  is a sectional view of the sander of  FIG. 9 ; 
         FIG. 11  is an enlarged view of a part A of  FIG. 10 ; 
         FIG. 12  is a sectional view of the cyclone dust collecting device of the sander of  FIG. 10 ; 
         FIG. 13  is an exploded view of the sander of  FIG. 9 ; 
         FIG. 14  is an enlarged view of a part B of  FIG. 13 ; 
         FIG. 15  is an exploded view of a dust collecting box of  FIG. 9 ; and 
         FIG. 16  is an exploded view of a dust collecting box of  FIG. 9  from another perspective; and 
         FIG. 17  is a sectional view of a portion of the sander of  FIG. 1 . 
     
    
    
     DETAILED DESCRIPTION 
     An example of the present disclosure provides a grinding device, and a sander is used as an example. Referring to  FIG. 1 , a host machine  100  of the sander includes at least a body  10 , a baseplate assembly  20 , a driving mechanism and a fan assembly. The top of the body  10  is formed with a holding portion for a user to hold, and the body  10  is configured to accommodate the driving mechanism and the fan assembly. 
     The baseplate assembly  20  is configured to fix a grinding member for implementing the functions of grinding and polishing. The baseplate assembly  20  includes a baseplate  21 , one side of the baseplate  21  facing the body  10  is connected to the body  10  through a vibration bracket, and another side of the baseplate  21  is used for fixing the grinding member such as a sandpaper. 
     The driving mechanism is configured to drive the baseplate assembly  20  to move and includes a motor. An output shaft of the motor is connected to the baseplate assembly  20  in a transmission manner so that the baseplate assembly  20  is driven to move, thereby implementing functions of grinding and polishing of the sander. 
     The fan assembly is used for forming a dust exhaust air path, the body  10  is provided with a dust exhaust channel  10   a , and the dust exhaust channel  10   a  includes a dust outlet disposed on one side of the body  10 . Dust is generated when the grinding piece acts on a workpiece. The sandpaper and the baseplate  21  are provided with a dust exhaust hole, air and the dust are sucked into the dust exhaust channel  10   a  in the body  10  through the dust exhaust hole, and a dust exhaust airflow mixed with dust flows out from the dust exhaust channel  10   a.    
     Referring to  FIGS. 2 and 3 , the sander provided by the example of the present disclosure further includes a cyclone dust collecting device  300 , the dust exhaust airflow flows out from the dust exhaust channel  10   a  of the body to the cyclone dust collecting device  300 , and the cyclone dust collecting device  300  separates the air from the dust and collects the dust in the dust collecting device. 
     Referring to  FIGS. 2 and 3 , the cyclone dust collecting device  300  in the example of the present disclosure includes a dust collecting box  30  and a separator  40 . The dust collecting box  30  includes a dust entrance  301  and a cavity  302  formed by extension in a first direction. The dust entrance  301  communicates with a dust outlet of the dust exhaust channel  10   a  of the host machine  100 , and the dust exhaust airflow enters the cavity  302  through the dust entrance  301 . 
     Referring to  FIGS. 3, 7 and 8 , the dust collecting box  30  includes an end cover  31  and a dust cylinder  32  which are detachably connected to each other, the end cover  31  is detachably connected to the body  10 , the cavity  302  is formed in the dust cylinder  32 , and the dust entrance  301  is formed on the end cover  31 . The end cover  31  and the dust cylinder  32  of the dust collecting box  30  are detachably connected to each other so that it is convenient to open the end cover to dump the dust. Specifically, as shown in  FIGS. 9 and 10 , the body  10  of the host machine  100  includes a first joint  11  extending into a tubular shape, and an opening of the tubular first joint  11  is formed with the dust outlet. As shown in  FIGS. 7, 9 and 10 , the dust collecting box  30  includes a second joint  311 , and as shown in  FIG. 2 , an open end of the second joint  311  is formed with the dust entrance  301 . 
     The separator  40  in the example of the present disclosure includes a mounting base  43  and a cyclone tube  42 . The mounting base  43  is connected to the end cover  31  and is provided with a dust inlet  41 . The mounting base is provided with the dust inlet  41 , the dust inlet  41  communicates with the dust entrance  301 , and the cyclone tube  42  extends in a second direction and is at least partially disposed in the dust collecting box  30 . 
     Two cyclones  42  are provided and disposed in parallel, and the two cyclones  42  are both connected to the mounting base  43 . The cyclone tube  42  includes a separating cylinder disposed at a rear end of the mounting base  43  (the rear end refers to the right side in  FIG. 3 , that is, one end away from the host machine  100 ) and an air-outlet cylinder disposed at a front end of the mounting base  43  (the front end refers to the left side in  FIG. 3 , that is, one end facing to the host machine  100 ). A rear end of the separating cylinder is provided with a dust outlet  421  for the dust exhaust airflow to enter, and the dust outlet  421  is located in the cavity  302 . A front end of the air-outlet cylinder is provided with an air outlet  422  for the dust exhaust airflow to discharge, and the air outlet  422  is used for communicating with an outside of the dust collecting box  30 . The end cover  31  is provided with two through holes corresponding to the air-outlet cylinders, and the air-outlet cylinders of the cyclone tube  42  pass through the through holes on the end cover  31  and communicate with the outside of the dust collecting box  30 . 
     The air carrying the dust enters the cavity  302  from the dust entrance  301  and the dust inlet  41 , the dust is separated and collected into the dust collecting box  30  after rotating around an outer periphery of a separating cylinder, and finally, the dust exhaust airflow enters the cyclone tube  42  through the dust outlet  421  of the cyclone tube  42  and is discharged out of the dust collecting box  30  through the air outlet  422  of the air-outlet cylinder. 
     Referring to  FIG. 2 , in this example, the first direction refers to an axial direction of the dust entrance  301 , and the second direction refers to an axial direction of the cyclone tube  42 . The second direction obliquely intersects the first direction. Specifically, the second direction obliquely intersects the first direction in a vertical plane. It may also to be understood that the second direction obliquely intersects the first direction in a plane perpendicular to a bottom wall  32   b  of the dust collecting box. In this manner, the dust outlet  421  of the cyclone is higher than the dust inlet  41 , and the air outlet  422  of the cyclone tube  42  is lower than the dust inlet  41 , so that the cyclone tube  42  being obliquely disposed in the dust collecting box  30  is implemented. 
     Specifically, an included angle between the first direction and the second direction in the vertical plane is greater than or equal to 15° and less than or equal to 45°. In  FIG. 2 , the first direction is denoted by O 1  and the second direction is denoted by O 2 , and the included angle between the first direction and the second direction is denoted by α. 
     On the one hand, the cyclone inclines within the above-mentioned angle so that the reduction of an axial size (that is, a size of the dust collecting box in the front and rear direction) of the dust collecting box  30  is facilitated and a volume of the dust collecting box  30  is smaller. On the other hand, since the dust outlet  421  of the cyclone tube  42  is raised, an effective dust accumulation space located below the dust outlet  421  is increased, the dust collection efficiency is higher, and the frequency of dust dumping of a user is reduced. Therefore, the effective dust accumulation space is ensured on the basis of reducing the volume of the dust collecting box, and the reduction of the dust accumulation space is avoided. 
     Referring to  FIG. 6 , in the example of the present disclosure, the air outlet  422  of the cyclone tube  42  is disposed away from the host machine  100 . Specifically, the cyclone tube  42  in the example of the present disclosure includes a guide piece  423  disposed at the air outlet  422 . The guide piece  423  is configured to guide an air-out direction at the air outlet  422  to deviate toward a direction away from the host machine  100  with respect to the second direction. The guide piece  423  changes the air-out direction at the air outlet  422  so that residual dust carried in an exhaust airflow is avoided from being sprayed and accumulated on the body of the host machine  100 . 
     The air outlet  422  is disposed facing away from the host machine  100 . Specifically, the air outlet  422  may be disposed facing an operating table or a rear end of the body; or the air outlet  422  is disposed obliquely relative to the baseplate assembly such that the air outlet  422  discharges air flow toward lower rear part of the body. 
     Since the air outlet  422  of the cyclone tube  42  is disposed facing away from the host machine  100 , a dust exhaust airflow that still carries a small amount of dust may be prevented from being blown onto the body  10  of the host machine  100 , thereby preventing the dust from accumulating on the body and ensuring the cleanliness and beauty of the appearance of the host machine  100 . 
     Referring to  FIG. 2 , in this example of the present disclosure, a vertical distance between a top wall  32   a  and a bottom wall  32   b  of the dust collecting box  30  is H, a vertical distance between a central axis of the cyclone tube  42  at the dust outlet  421  and the bottom wall  32   b  of the dust collecting box  30  is h, and the central axis of the cyclone tube  42  is shown as the second direction O 2 . H and h are shown in  FIG. 2 , where 0.5≤h/H≤0.9. In this example, h/H is 0.5, 0.6, or 0.8. Specifically, the central axis at the inlet refers to a position where the dust outlet  421  intersects the axis of the cyclone so that the dust outlet  421  is as close as possible to the top of the dust collecting box  30 , and a position of the dust outlet  421  is higher than a middle position of the dust collecting box  30  so that the effective dust accumulation space located below the dust outlet  421  is increased, the dust collection efficiency is higher, and the frequency of dust dumping of the user is reduced. 
     Referring to  FIGS. 4 to 6 , the separator  40  includes two cyclones  42 , the two cyclones  42  share one dust inlet  41 , and each cyclone tube  42  is provided with the dust outlet  421  and the air outlet  422 . 
     Referring to  FIG. 8 , the dust collecting box  30  further includes a dust blocking piece  33 , the dust cylinder  32  is provided with an opening  32   c  facing the host machine  100 , and the dust blocking piece  33  is disposed on a bottom wall  32   b  at an opening  32   c  of the dust cylinder  32 . The dust blocking piece  33  is capable of preventing the dust in the dust cylinder  32  from falling when the end cover  31  is disengaged from the dust cylinder  32 . The dust blocking piece  33  may be a plastic piece or a gasket. The dust blocking piece  33  may be integrally formed with the dust collecting box or may be separately formed and then mounted in the dust collecting box, which is not limited herein. 
     Referring to  FIG. 3 , in the example of the present disclosure, the end cover  31  and the dust cylinder  32  of the dust collecting box  30  are detachably connected to each other. Specifically, the sander further includes a mounting structure  30   a  disposed between the end cover  31  and the dust cylinder  32 . The dust cylinder  32  is detachably connected to the end cover  31  through the mounting structure  30   a , where the mounting structure  30   a  may be an engagement structure. 
     In this example, the mounting structure  30   a  includes an elastic buckle  30   b , and two elastic buckles  30   b  are provided and disposed on opposite two sides of the dust cylinder  32 . During mounting, the end cover  31  is inserted into the dust cylinder  32  so that the elastic buckle  30   b  implements locking. The arrangement of the elastic buckle  30   b  facilitates mounting and disassembly. 
     Referring to  FIGS. 7 and 8 , specifically, in this example, the elastic buckles  30   b  are disposed on upper and lower sides of the dust collecting box  30 , and the elastic buckle  30   b  includes an elastic arm  321  and a claw  313 . A pair of elastic arms  321  are disposed on upper and lower sides of the dust cylinder  32 . Each elastic arm  321  is provided with a protrusion portion  3211 . A pair of claws  313  are correspondingly disposed on upper and lower sides of the end cover  31 , and each claw  313  is provided with a groove  3131  that is fitted with the protrusion portion  3211  for locking. When the end cover is mounted, the claw  313  is inserted into an outside of the elastic arm  321 , the elastic arm  321  is compressed toward an inner side of the dust collecting box  30  and deformed with the insertion of the claw  313 , and when the claw  313  is mounted to a predetermined position, the protrusion portion  3211  outside the elastic arm  321  enters the groove  3131  inside the claw  313 . At this time, the elastic arm is held in a locked state with the claw  313  under its own elastic biasing force so that the claw  313  cannot be disengaged from the dust collecting box  30 . When the end cover is opened, a free end of the elastic arm  321  is pressed and since the elastic arm is compressed toward the inside of the dust collecting box, the protrusion portion  3211  on the elastic arm is disengaged from the groove  3131  inside the claw  313 . At this time, the end cover  31  is allowed to be opened and disengaged from the dust collecting box  30 . 
     Referring to  FIGS. 9 to 14 , in the example of the present disclosure, the dust collecting box  30  is detachably connected to the body  10 . The second joint  311  of the dust collecting box  30  has a locked state in which the second joint  311  is fitted with the first joint  11  of the body  10  for locking and an open state in which the second joint  311  is disengaged from the first joint  11 . When the second joint  311  is fitted with the first joint  11  for locking, the dust entrance  301  communicates with the dust outlet. For example, the first joint  11  and the second joint  311  may be locked in a threaded connection manner or in an engagement manner. 
     In this example, the first joint  11  is fitted with the second joint  311  for locking through a locking member. The locking member includes a first locking member and a second locking member. The first locking member is disposed on one of the first joint and the second joint, and the first locking member is radially protruding from the one joint. The second locking member is disposed on an outer periphery of the other joint of the first joint and the second joint, and the second locking member includes a sliding groove which is suitable for entry and locking of the first locking member. 
     Referring to  FIGS. 12 to 14 , in this example, the locking member includes the first locking member  111  and the second locking member, and the first locking member  111  is disposed on the first joint  11 . Specifically, the first locking member  111  is a protrusion radially protruding from the first joint  11 . The second locking member is disposed on the second joint  311  and includes the sliding groove  312  which is suitable for entry and locking of the protrusion. The sliding groove  312  includes a guide groove  3121  and a locking groove  3122 , the guide groove  3121  is disposed obliquely on an outer periphery of the second joint  311  with respect to an axis of the second joint  311 , and the locking groove  3122  is disposed at an end of the guide groove  3121  and configured to restrict the first locking member  111  from disengaging from the locking groove  3122  and entering the guide groove  3121 . In this example, the guide groove  3121  is an arc groove, and the guide groove  3121  is connected to the locking groove  3122  in a smooth-transition manner. Therefore, it is ensured that the first locking member  111  can easily slide into the locking groove  3122  during locking, which facilitates convenient operation of the user and improves the operation hand feeling of the user. Of course, positions of the first locking member and the second locking member are interchangeable. 
     In this example, two protrusions and two sliding grooves  312  are provided, the two protrusions are symmetrically disposed about an axis of the first joint  11 , and the two sliding grooves  312  are respectively disposed on opposite two sides of the outer periphery of the second joint  311 . 
     Referring to  FIGS. 11 and 12 , the sander further includes an auxiliary disengaging member  50 , the auxiliary disengaging member  50  is sandwiched between the first joint  11  and the second joint  311  and has a biasing force applied to the second joint  311  to disengage the second joint  311  from the first joint  11 . When the second joint  311  is fitted with the first joint  11  in a locked state for locking, the first joint  11  and the second joint  311  press the auxiliary disengaging member  50  to elastically deform the auxiliary disengaging member  50 . When the second joint  311  is disengaged from the first joint  11 , the auxiliary disengaging member  50  generates a thrust force on the second joint  311  to assist in disengaging the second joint  311 , thereby achieving rapid disassembly. On the other hand, the auxiliary disengaging member  50  may also play a function of auxiliary seal for the first joint and the second joint to ensure relative sealing of the first joint and the second joint. 
     In the example of the present disclosure, the auxiliary disengaging member  50  is specifically an elastic cushion, where the second joint  311  is sleeved on the first joint  11  so that an inner wall of the second joint  311  is annularly provided with a slot suitable for mounting the elastic cushion. Specifically, a position of an inner side of the second joint  311  corresponding to an end portion of the first joint  11  in an axial direction of the first joint is provided with the slot used for mounting the elastic cushion. Referring to  FIG. 11 ,  FIG. 11  illustrates the auxiliary disengaging member  50  in a compressed state, and when the dust collecting box  30  is mounted and fixed to the body, the first joint  11  abuts against and compresses the elastic cushion. Referring to  FIG. 12 ,  FIG. 12  illustrates the auxiliary disengaging member  50  in an uncompressed state, and when the dust collecting box  30  is removed from the body, the elastic cushion returns to a free state. 
     When the dust collecting box is mounted, the second joint  311  rotates in a locking direction and guides the protrusion to enter the guide groove  3121  of the sliding groove  312 , and the second joint  311  is further rotated so that the protrusion enters the locking groove  3122  of the sliding groove  312 . Since the locking groove  3122  is disposed at the end of the guide groove  3121  and an included angle exists between the locking groove  3122  and the guide groove  3121 , the locking groove  3122  plays a function of limiting the protrusion and preventing the protrusion from sliding out along the guide groove  3121 . During locking, the first joint  11  and the second joint  311  press the auxiliary disengaging member  50  to elastically deform the auxiliary disengaging member  50 . 
     When the dust collecting box is disassembled, the protrusion is guided to slide into the guide groove  3121  from the locking groove  3122 , and the auxiliary disengaging member  50  returns deformation to provide an elastic force for auxiliary unlocking so that the protrusion quickly slides out of the guide groove  3121 , thereby achieving rapid disassembly. The dust collecting box  30  is fitted with the body  10  through the first joint  11  and the second joint  311 , and rapid mounting and disassembly are achieved in a rotation manner so that the mounting is facilitated and time is saved. The auxiliary disengaging member  50  is used for providing the second joint  311  with the elastic force assisting the second joint  311  in being disengaged from the dust collecting box during unlocking so that the second joint  311  can be quickly bounced away from the first joint  11 , thereby improving the disassembly efficiency. 
     An outer circumferential surface of the first joint  11  is provided with a recess for mounting a sealing ring, and the sealing ring is mounted in the recess and sandwiched between the inner wall of the second joint  311  and an outer wall of the first joint  11 . The sealing ring mainly plays a function of sealing. 
     To sum up, the cyclone tube  42  is disposed obliquely in the dust collecting box  30  so that the axial size of the dust collecting box  30  can be reduced and the size of the dust collecting box  30  is small; and the dust flows upward from the dust inlet  41  and enters the dust collecting box  30  at the dust outlet  421  and accumulates in the dust collecting box  30 , and since the dust outlet  421  of the cyclone tube  42  is raised, the effective dust accumulation space below the end portion of the cyclone tube  42  is increased. Therefore, the dust collecting efficiency is higher without increasing the volume of the dust collecting box, and the frequency of dust dumping of the user is reduced. 
       FIGS. 9 to 16  show a sander including another cyclone dust collecting device  300 , where the structure of the host machine  100  of the sander and the main parts of the dust collecting box are the same as those described in the previous example and will not be repeated here. The same or corresponding parts as those described in the previous example are given the same reference numerals as those described in the previous example. The difference from the previous example is that the mounting structure  30   a  used for disassembling the dust cylinder and the end cover of the dust collecting box is different. 
     In this example, the mounting structure  30   a  between the dust collecting box  30  and the body  10  includes a rotation buckle  322  and a limiting protrusion  314 . Specifically, as shown in  FIGS. 15 and 16 , the limiting protrusion  314  is disposed on the end cover  31 , the rotation buckle  322  is disposed on the dust cylinder  32 , and the rotation buckle  322  is pivotally connected to the dust cylinder  32  through a rotating shaft  3222 . The rotation buckle  322  includes a hook portion  3220  and a biasing member  3221 , and the biasing member  3221  is configured to apply a biasing force, to the hook portion  3220 , which enables the hook portion  3220  to be fitted with the limiting protrusion  314  for locking. The biasing member  3221  is a spring, and the spring and the limiting protrusion  314  are respectively disposed on two sides of the rotating shaft  3222 . 
     During mounting, one end of the rotation buckle  322  is pressed such that the rotation buckle  322  is rotated relative to the dust cylinder  32 ; the end cover  31  is buckled at an opening of the dust cylinder  32  so that the limiting protrusion  314  is located below the hook portion  3220  of the rotation buckle  322 ; the rotation buckle  322  is released, and the hook portion  3220  is engaged with the limiting protrusion  314 ; and since the biasing member  3221  applies the biasing force, to the hook portion  3220 , which enables the hook portion  3220  to be fitted with the limiting protrusion  314  for locking, the buckle is in the locked state. 
     In this example, the locking between the end cover  31  and the dust cylinder  32  can be achieved with simply one rotation buckle  322 , and the structure is simpler and the mounting and disassembly are easier through the single-side engagement manner. Of course, two rotation buckles disposed opposite to each other may also be provided, which is no limited herein. 
     As shown in  FIG. 17 , the baseplate  21  comprise an upper surface  21   a  and a lower surface  21   b , and the lower surface  21   b  extends alone a plane P. The intersection point P 1  of central axis O 2  of the cyclone tube  42  and the baseplate  21  is provided on the lower side of the upper surface  21   a  of the baseplate  21 . The guide piece  423  is provided with a guide plane  423   a  for guiding the dust exhaust airflow to deviate from the central axis O 2 . The cross-sectional line L 1  of the guide plane  423   a  in a vertical plane does not pass through the baseplate  21 . 
     The above examples describe merely the basic principles and characteristics of the present disclosure and the present disclosure is not limited to the above examples. Various modifications and changes may be made in the present disclosure without departing from the spirit and scope of the present disclosure. These modifications and changes fall within the scope of the present disclosure. The scope of the present disclosure is defined by the appended claims and equivalents thereof.