A power tool that is easy to assemble

Abstract

This utility model discloses an easy-to-assemble power tool, including a main unit and a working component. The main unit includes a first docking part, a first shaft locking part, and an unlocking button. The unlocking button includes a pressing part, a first peripheral locking part, and a connecting part. The working component includes a second docking part, a second shaft locking part, and a second peripheral locking part. The second peripheral locking part includes a peripheral locking groove and a sliding groove. The bottom surface of the sliding groove is set as a slope, and the height of the end of the slope away from the peripheral locking groove is lower than the height of the end near the peripheral locking groove. When the working component rotates in the forward direction around the rotation axis, the second shaft locking part gradually rotates until it is axially locked with the first shaft locking part. At the same time, the first peripheral locking part presses against the sliding groove and slides towards the top of the peripheral locking groove. In the axially locked state, the connecting part is gradually subjected to force and elastically deflected relative to the pressing part. Under the elastic restoring force of the connecting part, it springs into the peripheral locking groove and locks circumferentially with it. The working component of this power tool is easy and labor-saving to assemble, and facilitates the assembly and replacement of the working component.

Description

Technical Field

[0001] This utility model relates to the field of power tools, and in particular to a power tool that is easy to assemble. Background Technology

[0002] Power tools such as polishing machines and grinding machines often require different working components to be replaced according to different usage needs such as rough polishing, fine polishing, large-area polishing, and small-area polishing.

[0003] Existing power tools, such as the utility model patent with announcement number CN223114874U entitled "A Quick-Release Device and a Polishing Machine", have a polishing machine body and polishing components that are axially locked by a quick-release part and a locking groove, and circumferentially locked by a buckle on a pressing part on the polishing machine body and a limiting groove on the polishing component. This allows the polishing component to be assembled or disassembled relative to the polishing body, making it convenient to replace polishing components of different specifications to meet different usage needs.

[0004] In the above technical solution, when assembling the polishing component, because the buckle presses against the outer surface of the polishing component, the operator must forcefully squeeze the polishing component relative to the polishing body in order to allow the quick-release part to extend axially into the side of the locking groove. Only then can the polishing component rotate relative to the polishing body until the quick-release part extends into the locking groove from one end and locks axially with the locking groove, and the buckle slides along the outer surface of the polishing machine component to spring into the limiting groove and locks circumferentially with the limiting groove. This operation is quite laborious. Summary of the Invention

[0005] This utility model addresses the shortcomings of existing technologies by providing an easy-to-assemble power tool whose working components are easy and labor-saving to assemble, and convenient to assemble and replace.

[0006] The technical solution adopted in this utility model is as follows:

[0007] An easily assembled power tool includes a main unit and a working assembly. The main unit includes a first mating member arranged along a rotation axis, a first locking member arranged around the rotation axis, and an unlocking button. The unlocking button includes a pressing member, a first locking member, and a connecting member connecting the pressing member and the first locking member. The connecting member is capable of elastically deflecting relative to the pressing member based on the force applied by the first locking member. The working assembly includes a second mating member arranged along a rotation axis, a second locking member, and a second locking member arranged around the rotation axis. The second mating member and the first mating member are mated together. The first circumferential locking component rotates in one step; the second circumferential locking component includes a circumferential locking groove and a sliding groove arranged on one side of the circumferential locking groove and arranged circumferentially around the rotation axis. The bottom surface of the sliding groove is set as a slope surface, and the height of the slope surface away from the circumferential locking groove is lower than the height of the end close to the circumferential locking groove. When the working component rotates in the forward direction around the rotation axis, the second circumferential locking component gradually rotates to be axially locked with the first circumferential locking component. At the same time, the first circumferential locking component presses against the sliding groove and slides towards the top of the circumferential locking groove. Under the axial locking state, the connecting component gradually applies force to elastically deflect relative to the pressing component, and under the elastic restoring force of the connecting component, it springs into the circumferential locking groove and locks with it circumferentially.

[0008] Preferably, the second circumferential locking member further includes a movable groove arranged circumferentially inside the slide groove and communicating with the circumferential locking groove around the rotation axis; when the first circumferential locking member is circumferentially locked with the circumferential locking groove, the first circumferential locking member can enter the movable groove when the unlocking button is pressed, so as to release the circumferential locking with the circumferential locking groove; when the working component rotates in the opposite direction around the rotation axis, the first circumferential locking member moves circumferentially along the movable groove to move away from the circumferential locking groove.

[0009] Preferably, the top of the slope surface and the top of one side wall of the circumferential locking groove are smoothly connected by an arc surface.

[0010] Preferably, the slide groove is connected to the movable groove, the bottom wall of the slide groove is set as a limiting block, the top surface of the limiting block forms the bottom surface of the slide groove, one end face of the limiting block forms one end side of the circumferential locking groove, and the inner circumferential side of the limiting block forms the outer circumferential side of the movable groove; the connecting member extends from the inner wall of the pressing member into the main unit, the first circumferential locking member is set as a protrusion extending from the inner end of the connecting member towards the working component, the two sides of the protrusion arranged along the circumferential direction of the rotation axis are respectively set as surface structures that match the two side wall surfaces of the circumferential locking groove arranged along the circumferential direction of the rotation axis, and the side of the protrusion near the rotation axis and the side away from the rotation axis are respectively set as surface structures that match the side wall surface of the movable groove near the rotation axis and the side wall surface away from the rotation axis.

[0011] Preferably, the unlocking button and the second circumferential locking member are respectively provided in two sets along the circumferential direction of the rotation axis, and the two sets of unlocking buttons are arranged radially opposite each other along the rotation axis. The circumferential locking grooves of the two sets of second circumferential locking members are respectively arranged on one end of the corresponding slide groove in the positive rotation direction around the rotation axis.

[0012] Preferably, the first shaft locking component includes a first shaft locking block, the second shaft locking component includes a shaft locking groove and a loading / unloading groove arranged at one end of the shaft locking groove and communicating with the shaft locking groove, the second shaft locking component and the first shaft locking component are axially locked in the shaft locking groove by the first shaft locking block, and the first shaft locking block can move axially along the loading / unloading groove to separate from the working component.

[0013] Preferably, at least two sets of the first shaft locking member and the second shaft locking member are respectively provided along the circumferential direction of the rotation axis. The second shaft locking member further includes a second shaft locking block. One side of the second shaft locking block forms one side of the shaft locking groove. The second shaft locking blocks of two adjacent sets of second shaft locking members are arranged at intervals to form the loading and unloading groove. The first shaft locking blocks of two adjacent sets of first shaft locking members are arranged at intervals to form an interval channel. The second shaft locking block can move axially along the interval channel to separate from the host machine.

[0014] Preferably, the host includes a host housing and a drive device installed inside the host housing. The first docking member is configured as part of the output shaft of the drive device. The first docking member and the second docking member are docked by axial insertion. The first shaft locking member and the unlocking button are respectively disposed on the host housing, and the unlocking button is radially slidably connected to the host housing along the rotation axis.

[0015] Preferably, the working assembly includes a mounting structure, an eccentric structure rotatably connected to the mounting structure via a central shaft arranged along the axis of rotation, and a polishing structure rotatably connected to the eccentric structure via an eccentric shaft offset from the axis of rotation. The second docking member is set as a part of the central shaft structure, and the second shaft locking member and the second peripheral locking member are respectively disposed on the mounting structure.

[0016] Preferably, the mounting structure includes a mounting housing and a locking plate fixed to the outside of the mounting housing. The central shaft is rotatably connected to the mounting housing along the rotation axis, with the inner end of the central shaft extending into the mounting housing and connecting to the eccentric structure, and the outer end extending out of the mounting structure. A central hole is provided through the middle of the locking plate for the outer end of the central shaft to rotate inside. The second shaft locking member is arranged along the outer periphery of the locking plate. The second peripheral locking member is arranged along the side of the locking plate away from the eccentric structure.

[0017] The beneficial effects achieved by this utility model are as follows:

[0018] The power tool provided by this utility model has a sliding groove on one side of the circumferential locking groove. The bottom surface of the sliding groove is a sloping surface, and the height of the end of the sloping surface away from the circumferential locking groove is lower than the height of the end near the circumferential locking groove. Therefore, when assembling the working component, the operator only needs to rotate the working component in the forward direction along the rotation axis to simultaneously drive the second shaft locking member and the second circumferential locking member to rotate in the forward direction around the rotation axis. This makes the first shaft locking member axially locked with the second shaft locking member and circumferentially locked with the first circumferential locking member, preventing the working component from rotating relative to the main unit or falling off. The operation is simple and convenient. Furthermore, during the rotation of the working component, the second shaft locking member gradually rotates to be axially locked with the first shaft locking member. The first locking member presses against the slide groove and slides towards the top of the circumferential locking groove. Under the axial locking state, the connecting member is gradually deflected relative to the pressing member. Under the elastic restoring force of the connecting member, it springs into the circumferential locking groove and locks with it circumferentially. This allows the first locking member to gradually apply force to the connecting member relative to the pressing member under the limiting force of the axial locking of the first and second shaft locking members during the rotation of the working component. Thus, the axial limiting force of the axial locking of the first and second shaft locking members replaces the squeezing force applied by the operator to the working component relative to the main unit. This makes assembly easy and labor-saving, and facilitates the assembly and replacement of the working component. Attached Figure Description

[0019] Figure 1 This is an exploded view of a power tool according to an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the structure of an electric tool according to an embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the structure of a working component according to an embodiment of the present invention.

[0022] Figure 4 This is a partial structural diagram of the host computer according to an embodiment of the present invention.

[0023] Figure 5 This is an exploded view of the working components of an embodiment of the present invention.

[0024] Figure 6 This is an exploded view of a portion of the main unit structure according to an embodiment of the present invention.

[0025] Figure label:

[0026] Main unit 1; First docking part 11; First shaft locking part 12, first shaft locking block 121, spacer channel 122; First peripheral locking part 13; Pressing part 14; Connecting part 15; Main unit housing 101, sleeve 1011, ring plate 1012; Drive device 102, output shaft 1021;

[0027] Working component 2; second docking part 21; second shaft lock part 22, shaft lock groove 221, loading and unloading groove 222, second shaft lock block 223; second peripheral lock part 23, peripheral lock groove 231, sliding groove 232, movable groove 233; mounting structure 201, mounting housing 2011, locking plate 2012; eccentric structure 202; polishing structure 203; central shaft 204; eccentric shaft 205;

[0028] Rotation axis L. Detailed Implementation

[0029] like Figures 1-6As shown in the figure, as an embodiment of the present invention, a power tool that is easy to assemble is provided, including a main unit 1 and a working component 2. The main unit 1 includes a first docking member 11 arranged along the rotation axis L, a first shaft locking member 12 arranged around the rotation axis L, and an unlocking button. The unlocking button includes a pressing member 14, a first peripheral locking member 13, and a connecting member 15 connecting the pressing member 14 and the first peripheral locking member 13. The connecting member 15 is capable of elastically deflecting relative to the pressing member 14 based on the force applied by the first peripheral locking member 13. The working component 2 includes a second docking member 21 arranged along the rotation axis L, a second shaft locking member 22, and a second peripheral locking member 23 arranged around the rotation axis L. The second docking member 21 rotates synchronously after docking with the first docking member 11. The second peripheral locking member 23 includes a peripheral locking groove 231 and a sliding groove 232 arranged on one side of the peripheral locking groove 231 and arranged circumferentially around the rotation axis L. The bottom surface of the slide groove 232 is set as a slope, and the height of the end of the slope away from the circumferential locking groove 231 is lower than the height of the end near the circumferential locking groove 231. When the working component 2 rotates in the positive direction around the rotation axis L, the second shaft locking member 22 gradually rotates to be axially locked with the first shaft locking member 12. At the same time, the first circumferential locking member 13 presses against the slide groove 232 and slides towards the top of the circumferential locking groove 231. Under the axial locking state, the connecting member 15 is gradually subjected to force to elastically deflect relative to the pressing member 14. Under the elastic restoring force of the connecting member 15, it springs into the circumferential locking groove 231 and locks with it circumferentially. In this embodiment, when the power tool needs to assemble the working component 2, the operator only needs to rotate the working component 2 in the positive direction along the rotation axis L. This simultaneously drives the second shaft locking member 22 and the second circumferential locking member 23 to rotate around the rotation axis L in the positive direction, so that the first shaft locking member 12 is axially locked with the second shaft locking member 22, and the first circumferential locking member 13 is circumferentially locked with the second circumferential locking member 23. This prevents the working component 2 from rotating relative to the main unit 1 or falling off, and the operation is simple and convenient. During the rotation of the working component 2, the second shaft locking member 22 gradually rotates until it is axially locked with the first shaft locking member 12, while the first circumferential locking member 13 presses against the slide groove 232 and slides towards the top of the circumferential locking groove 231. In the axially locked state, the connecting piece 15 is gradually forced to elastically deflect relative to the pressing piece 14. Under the elastic restoring force of the connecting piece 15, it springs into the circumferential locking groove 231 and locks with it circumferentially. This allows the first circumferential locking piece 13 to gradually force the connecting piece 15 to elastically deflect relative to the pressing piece 14 under the limiting force of the mutual axial locking of the first shaft locking piece 12 and the second shaft locking piece 22 during the rotation of the working component 2. Thus, the axial limiting force of the mutual axial locking of the first shaft locking piece 12 and the second shaft locking piece 22 replaces the squeezing force applied by the operator to the working component 2 by manually squeezing it relative to the main unit 1. This makes assembly easy and effortless, and facilitates the assembly and replacement of the working component 2.

[0030] like Figure 3As shown, in this embodiment, the second circumferential locking member 23 further includes a movable groove 233 arranged circumferentially around the rotation axis L, inside the slide groove 232, and communicating with the circumferential locking groove 231. When the first circumferential locking member 13 is circumferentially locked with the circumferential locking groove 231, the first circumferential locking member 13 can enter the movable groove 233 when the unlocking button is pressed, so as to release the circumferential locking with the circumferential locking groove 231. When the working component 2 rotates in the opposite direction around the rotation axis L, the first circumferential locking member 13 moves circumferentially along the movable groove 233 to move away from the circumferential locking groove 231. When it is necessary to disassemble the working component 2, the operator only needs to press the unlock button by pressing the presser 14 to move from the circumferential lock groove 231 into the movable groove 233, so that the first circumferential lock 13 can be released from the circumferential lock groove 231. At this time, the first shaft lock 12 and the second shaft lock 22 are still in the axial lock state. The working component 2 can rotate relative to the host 1 around the rotation axis L, but cannot move axially relative to the host 1. The operator only needs to rotate the working component 2 in the opposite direction along the rotation axis L, so that the second shaft lock 22 and the second circumferential lock 23 can rotate in the opposite direction around the rotation axis L until the second shaft lock 22 rotates in the opposite direction around the rotation axis L until it is released from the axial lock with the first shaft lock 12, so that the second shaft lock 22 and the first shaft lock 12 are released from the axial lock. At the same time, the second circumferential lock 23 also rotates in the opposite direction around the rotation axis L, so that the first circumferential lock 13 moves away from the circumferential lock groove 231 along the movable groove 233, so as to prevent the first circumferential lock 13 from returning to the circumferential lock groove 231.

[0031] In this embodiment, the top of the ramp surface and the top of one side wall of the circumferential locking groove 231 are smoothly connected by an arc surface, which is conducive to the first circumferential locking member 13 smoothly sliding from the ramp surface to the top of the circumferential locking groove 231 along the arc surface.

[0032] In this embodiment, the slide 232 is connected to the movable groove 233. The bottom wall of the slide 232 is set as a limiting block. The top surface of the limiting block forms the bottom surface of the slide 232. One end face of the limiting block forms one end side of the peripheral locking groove 231. The inner peripheral side of the limiting block forms the outer peripheral side of the movable groove 233. This makes the structural arrangement between the peripheral locking groove 231, the slide 232, and the movable groove 233 simple and ingenious. When assembling or disassembling the working component 2, the first peripheral locking component 13 moves along the surface of the limiting block.

[0033] In this embodiment, the unlock button is made of plastic material, which has a certain degree of toughness. The connecting member 15 extends from the inner wall of the pressing member 14 into the host 1, so as to provide an appropriate elastic restoring force after the pressing member 14 is elastically deflected relative to the pressing member 14 based on the force applied by the first circumferential locking member 13. The first circumferential locking member 13 is configured as a protrusion extending from the inner end of the connecting member 15 towards the working component 2, so as to easily extend into the circumferential locking groove 231 and lock circumferentially with the circumferential locking groove 231. The two sides of the protrusion arranged along the circumferential direction of the rotation axis L are respectively configured as surface structures that match the surface of the two side walls arranged along the circumferential direction of the rotation axis L of the circumferential locking groove 231. When the first circumferential locking member 13 is circumferentially locked with the circumferential locking groove 231, the two sides of the protrusion arranged along the circumferential direction of the rotation axis L can respectively abut against the two side walls arranged along the circumferential direction of the rotation axis L of the circumferential locking groove 231. The side of the protrusion closest to the rotation axis L and the side furthest from the rotation axis L are respectively configured to match the surface structures of the side walls of the movable groove 233 closest to and furthest from the rotation axis L. When the first locking member 13 moves along the movable groove 233, the side of the protrusion closest to the rotation axis L and the side furthest from the rotation axis L can respectively abut against the side walls of the movable groove 233 closest to and furthest from the rotation axis L, improving the stability and durability of the first locking member 13 structure, improving the stability of circumferential locking, and the smoothness of movement along the movable groove 233. An elastic element (not shown in the figure) is provided between the unlock button and the host 1. This elastic element can be configured as a compression spring, elastic silicone, etc., for resetting after the unlock button is pressed, facilitating the next press of the unlock button.

[0034] like Figure 3 , Figure 4 As shown, in this embodiment, two sets of unlocking buttons and two sets of second circumferential locking components 23 are respectively arranged along the circumferential direction of the rotation axis L to improve the stability of circumferential locking. The two sets of unlocking buttons are arranged radially opposite each other along the rotation axis L, making it convenient for the operator to unlock the two sets of second circumferential locking components 23 by pressing the two unlocking buttons simultaneously with the thumb and index or middle finger. The circumferential locking grooves 231 of the two sets of second circumferential locking components 23 are respectively arranged on one end of the corresponding slide groove 232 in the positive rotation direction around the rotation axis L, so that when the working component 2 is rotated in the positive direction around the rotation axis L, the two sets of second circumferential locking components 23 can be simultaneously driven to slide along the corresponding slide groove 232 toward the top of the circumferential locking groove 231.

[0035] like Figure 4As shown, in this embodiment, the first shaft locking member 12 includes a first shaft locking block 121, and the second shaft locking member 22 includes a shaft locking groove 221 and a loading and unloading groove 222 arranged on one end of the shaft locking groove 221 and connected to the shaft locking groove 221. The second shaft locking member 22 and the first shaft locking member 12 are axially locked in the shaft locking groove 221 by the first shaft locking block 121. The first shaft locking block 121 can move axially along the loading and unloading groove 222 to separate from the working component 2. When the working component 2 needs to be disassembled, the working component 2 is rotated until the first shaft locking member 12 and the second shaft locking member 22 are axially unlocked. The first shaft locking block 121 gradually rotates from the shaft locking groove 221 into the loading and unloading groove 222 and is axially unlocked from the shaft locking groove 221. Then the working component 2 is axially moved relative to the host 1 until each first shaft locking block 121 is axially moved out of the host 1 from the corresponding shaft locking groove 221, so that the working component 2 can be separated from the host 1. When the working component 2 needs to be assembled, the loading and unloading groove 222 is first aligned with the first shaft locking block 121, so that the working component 2 is axially moved relative to the host 1 until the first shaft locking block 121 extends into the loading and unloading groove 222 and is arranged on one end of the shaft locking groove 221, so that the first shaft locking block 121 can gradually rotate into the shaft locking groove 221 and be axially locked with the shaft locking groove 221. Alignment marks are marked on the outside of the main unit 1 and the outside of the working component 2, respectively, to align the first shaft locking block 121 and the shaft locking groove 221, so as to facilitate precise docking between the working component 2 and the main unit 1 during assembly.

[0036] like Figure 3 , Figure 4 As shown, in this embodiment, three sets of first shaft locking members 12 and second shaft locking members 22 are respectively arranged along the circumferential direction of the rotation axis L to improve the stability of axial locking. The second shaft locking member 22 also includes a second shaft locking block 223, one side of which forms one side of a shaft locking groove 221. The second shaft locking blocks 223 of adjacent sets of second shaft locking members 22 are arranged at intervals to form the loading / unloading groove 222. The first shaft locking blocks 121 of adjacent sets of first shaft locking members 12 are arranged at intervals to form a spacer channel 122, allowing the second shaft locking blocks 223 to move axially along the spacer channel 122 and separate from the host machine 1. Each second shaft locking block 223 is staggered from the first shaft locking block 121, and each spacer channel 122 is staggered from the loading / unloading groove 222, facilitating interlocking and disassembly of the first shaft locking blocks 121 and the second shaft locking blocks 223. In other embodiments, the first shaft locking member 12 and the second shaft locking member 22 may also be configured in two sets or other quantities respectively along the circumferential direction of the rotation axis L.

[0037] like Figure 6As shown, in this embodiment, the host 1 includes a host housing 101 and a drive device 102 installed inside the host housing 101. The first docking member 11 is a partial structure of the output shaft 1021 of the drive device 102. The first docking member 11 and the second docking member 21 are connected by axial insertion. One of the first docking member 11 and the second docking member 21 has a non-circular cylindrical groove structure, and the other has a non-circular cylindrical shaft structure that is inserted into it. They are synchronously rotated within the non-circular cylindrical groove structure through the insertion of the non-circular cylindrical shaft structure. The first shaft locking member 12 and the unlocking button are respectively disposed on the host housing 101, that is, the first shaft locking member 12 and the unlocking button do not rotate with the rotation of the output shaft 1021 relative to the host housing 101. The unlocking button is radially slidably connected to the host housing 101 along the rotation axis L.

[0038] like Figure 5 As shown, in this embodiment, the working component 2 includes a mounting structure 201, an eccentric structure 202 rotatably connected to the mounting structure 201 via a central shaft 204 arranged along the rotation axis L, and a polishing structure 203 rotatably connected to the eccentric structure 202 via an eccentric shaft 205 offset from the rotation axis L. The polishing structure 203 is used for polishing or grinding, and the eccentric structure 202 is used to offset the eccentric shaft 205 from the central shaft 204 so that the polishing structure 203 can achieve a large-range, low-torque polishing or grinding effect. The second docking member 21 is set as a part of the structure of the central shaft 204, and the second shaft locking member 22 and the second peripheral locking member 23 are respectively set on the mounting structure 201. That is to say, the second shaft locking member 22 and the second peripheral locking member 23 do not rotate with the rotation of the central shaft 204 relative to the mounting structure 201.

[0039] In this embodiment, the mounting structure 201 includes a mounting housing 2011 and a locking plate 2012 fixed to the outside of the mounting housing 2011. A central shaft 204 is rotatably connected to the mounting housing 2011 along the rotation axis L, with its inner end extending into the mounting housing 2011 and connecting to the eccentric structure 202, and its outer end extending out of the mounting structure 201. A central hole is provided through the middle of the locking plate 2012 for the outer end of the central shaft 204 to rotate within it. A second shaft locking member 22 is arranged along the outer periphery of the locking plate 2012, and a second peripheral locking member 23 is arranged along the side of the locking plate 2012 away from the eccentric structure 202. The main housing 101 includes a sleeve 1011 arranged around the output shaft 1021 and an annular plate 1012 extending from the inner circumferential sidewall of the sleeve 1011 toward the rotation axis L. A channel is formed in the middle of the annular plate 1012 for the outer end of the central shaft 204 to extend into the main housing 101 and mate with the output shaft 1021. First shaft locking members 12 are spaced apart on the outer side of the annular plate 1012 and arranged along the inner circumferential side of the sleeve 1011. An unlocking button is arranged on the inner side of the annular plate 1012 and is slidably connected to the sleeve 1011 radially along the rotation axis L. A second channel is provided through the annular plate 1012 for the first shaft locking member 13 to extend out of the outer side of the annular plate 1012 and be able to move radially along the rotation axis L.

[0040] In summary, the above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made within the scope of the patent application of the present utility model shall fall within the scope of the patent of the present utility model.

Claims

1. A power tool that is easy to assemble, characterized by comprising: include: The main unit includes a first docking member arranged along a rotation axis, a first shaft locking member arranged around the rotation axis, and an unlocking button. The unlocking button includes a pressing member, a first peripheral locking member, and a connecting member connecting the pressing member and the first peripheral locking member. The connecting member is capable of elastically deflecting relative to the pressing member based on the force applied by the first peripheral locking member. The working assembly includes a second docking member arranged along the rotation axis, a second shaft locking member and a second circumferential locking member arranged around the rotation axis, wherein the second docking member and the first docking member rotate synchronously after docking with each other; the second circumferential locking member includes a circumferential locking groove and a sliding groove arranged on one side of the circumferential locking groove and arranged circumferentially around the rotation axis, wherein the bottom surface of the sliding groove is set as a slope surface, and the height of the slope surface away from the circumferential locking groove is lower than the height of the end close to the circumferential locking groove; When the working component rotates in the forward direction around the rotation axis, the second shaft locking member gradually rotates to be axially locked with the first shaft locking member. At the same time, the first circumferential locking member presses against the slide groove and slides towards the top of the circumferential locking groove. Under the axial locking state, the connecting member gradually applies force to elastically deflect relative to the pressing member. Under the elastic restoring force of the connecting member, it springs into the circumferential locking groove and locks with it circumferentially.

2. The power tool of claim 1, wherein: The second circumferential locking component also includes a movable groove arranged circumferentially around the axis of rotation inside the slide groove and connected to the circumferential locking groove; When the first circumferential locking member is circumferentially locked to the circumferential locking groove, the first circumferential locking member can enter the movable groove when the unlocking button is pressed, so as to release the circumferential locking from the circumferential locking groove; When the working component rotates in the opposite direction about the rotation axis, the first circumferential locking member moves circumferentially along the movable groove to a position away from the circumferential locking groove.

3. The power tool of claim 2, wherein: The top of the slope surface and the top of one side wall of the circumferential locking groove are smoothly connected by an arc surface.

4. The power tool of claim 2, wherein: The chute is connected to the movable groove. The bottom wall of the chute is set as a limiting block. The top surface of the limiting block forms the bottom surface of the chute. One end face of the limiting block forms one end side of the circumferential locking groove. The inner circumferential side of the limiting block forms the outer circumferential side of the movable groove. The connector extends from the inner wall of the pressing member into the main unit. The first circumferential locking member is a protrusion extending from the inner end of the connector towards the working component. The two sides of the protrusion arranged along the circumferential direction of the rotation axis are respectively configured to match the surface structures of the two side walls arranged along the circumferential direction of the rotation axis on the circumferential locking groove. The side of the protrusion near the rotation axis and the side away from the rotation axis are respectively configured to match the surface structures of the side wall near the rotation axis and the side wall away from the rotation axis on the movable groove.

5. The power tool of claim 2, wherein: The unlocking button and the second circumferential locking component are respectively provided in two sets along the circumferential direction of the rotation axis, and the two sets of unlocking buttons are arranged radially opposite each other along the rotation axis. The circumferential locking grooves of the two sets of second circumferential locking components are respectively arranged on one end of the corresponding slide groove in the positive rotation direction around the rotation axis.

6. The power tool of claim 2, wherein: The first shaft locking component includes a first shaft locking block, and the second shaft locking component includes a shaft locking groove and a loading and unloading groove arranged at one end of the shaft locking groove and communicating with the shaft locking groove. The second shaft locking component and the first shaft locking component are axially locked in the shaft locking groove by the first shaft locking block. The first shaft locking block can move axially along the loading and unloading groove to separate from the working component.

7. The power tool of claim 6, wherein: The first shaft locking member and the second shaft locking member are respectively provided in at least two sets along the circumferential direction of the rotation axis. The second shaft locking member also includes a second shaft locking block. One side of the second shaft locking block forms one side of the shaft locking groove. The second shaft locking blocks of two adjacent sets of second shaft locking members are arranged at intervals to form the loading and unloading groove. The first shaft locking blocks of two adjacent sets of first shaft locking members are arranged at intervals to form an interval channel. The second shaft locking block can move axially along the interval channel to separate from the host machine.

8. The power tool of claim 1, wherein: The host includes a host housing and a drive device installed inside the host housing. The first docking member is configured as part of the output shaft of the drive device. The first docking member and the second docking member are docked by axial insertion. The first shaft lock and the unlocking button are respectively disposed on the host housing, and the unlocking button is radially slidably connected to the host housing along the rotation axis.

9. The power tool of any of claims 1-8, wherein: The working assembly includes a mounting structure, an eccentric structure rotatably connected to the mounting structure via a central shaft arranged along the axis of rotation, and a polishing structure rotatably connected to the eccentric structure via an eccentric shaft offset from the axis of rotation. The second docking member is set as a part of the central shaft structure, and the second shaft locking member and the second peripheral locking member are respectively set on the mounting structure.

10. The power tool of claim 9, wherein: The mounting structure includes a mounting housing and a locking plate fixed to the outside of the mounting housing. The central shaft is rotatably connected to the mounting housing along the rotation axis, with the inner end of the central shaft extending into the mounting housing and connecting to the eccentric structure, and the outer end extending out of the mounting structure. A central hole is provided through the middle of the locking plate for the outer end of the central shaft to rotate inside. The second shaft locking member is arranged along the outer periphery of the locking plate. The second peripheral locking member is arranged along the side of the locking plate away from the eccentric structure.

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