A power tool with a convenient alignment connection

Abstract

The utility model discloses an electric tool convenient for alignment connection, including host computer and work subassembly, and the host computer includes host computer shell, drive arrangement, and drive arrangement output shaft free end is set to first docking piece, and work subassembly includes mounting structure, work member rotatablely connected with mounting structure through positioning shaft, and synchronous rotation connection telescopic axle on positioning axle, and telescopic axle free end is set to second docking piece, and reset piece is equipped between telescopic axle and positioning axle, and when mounting structure is along rotation axis positive rotation, second docking piece can be misaligned arrangement with first docking piece, and is shortened relative to positioning axle under the pressure of first docking piece outer end wall, and after locking, second docking piece can be relative to positioning axle elongation under the reset force of reset piece when output shaft rotates to align with first docking piece, and is inserted with first docking piece and cooperates. The electric tool can realize the alignment connection between first docking piece and second docking piece, and the work subassembly is assembled conveniently.

Description

Technical Field

[0001] This utility model relates to the field of power tools, and more particularly to a power tool that facilitates alignment and connection. 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 a polishing component that are engaged in a polygonal mating groove by a snap-fit ​​connection. The snap-fit ​​is rotatably connected to the polishing shell and to the working components such as the eccentric block or polishing disc. The mating groove is located on the output shaft of the drive device inside the polishing machine body, so that the drive device drives the working components such as the eccentric block or polishing disc to rotate. The quick-release part is axially locked by interlocking with the locking groove, and the snap-fit ​​on the pressing part on the polishing machine body is circumferentially locked by interlocking with the 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, since the buckle rotates relative to the polishing shell, it is easy for the buckle to misalign with the mating groove. Once misalignment occurs, the polishing component cannot be assembled in place, causing inconvenience to people. Summary of the Invention

[0005] This utility model addresses the shortcomings of existing technologies by providing an electric tool that facilitates alignment and connection, enabling alignment and connection between the first and second mating parts, thus facilitating the assembly of working components.

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

[0007] An electric tool for easy alignment and connection includes a main unit and a working component. The main unit includes a main unit housing and a drive unit mounted within the main unit housing. The output shaft of the drive unit is arranged along a rotation axis, and the free end of the output shaft is configured as a first mating member. The main unit housing is provided with a first locking component arranged around the rotation axis. The working component includes a mounting structure, a working member rotatably connected to the mounting structure via a positioning shaft arranged along the rotation axis, and a telescopic shaft synchronously rotatably connected to the positioning shaft. The free end of the telescopic shaft is configured as a second mating member. One of the first and second mating members has a non-circular cylindrical groove, and the other... A non-circular cylindrical shaft is provided for insertion and mating; a reset component is provided between the telescopic shaft and the positioning shaft; a second locking assembly is provided on the mounting structure; the mounting structure rotates in the forward direction along the rotation axis, causing the second locking assembly and the first locking assembly to lock together; when the mounting structure rotates, the second mating member can be misaligned with the first mating member and shortens relative to the positioning shaft under the pressure of the outer end wall of the first mating member; after the second locking assembly and the first locking assembly lock together, the second mating member can extend relative to the positioning shaft and insert and mat with the first mating member under the reset force of the reset component when the output shaft rotates to align with the first mating member.

[0008] Preferably, the positioning shaft is provided with a first telescopic channel, and the second docking member is telescopically connected to the first telescopic channel. The outer peripheral side of the second docking member is set as a non-circular cylindrical structure. The first telescopic channel is a non-circular cylindrical channel that matches the second docking member. When the telescopic shaft moves telescopically relative to the positioning shaft, it can be guided and circumferentially limited by the movement of the second docking member along the first telescopic channel.

[0009] Preferably, the telescopic shaft further includes a connecting shaft connected to the second docking member and a limiting member connected to the connecting shaft at one end away from the second docking member. A second telescopic channel communicating with the first telescopic channel is provided through the positioning shaft, and the radial width of the connecting shaft is smaller than the radial width of the second docking member, and the radial width of the second telescopic channel is smaller than the radial width of the first telescopic channel. The connecting shaft is telescopically connected inside the second telescopic channel, and the second docking member and the limiting member are respectively limited to the two ends of the second telescopic channel. The reset member is sleeved outside the connecting shaft and presses against the inner end of the second docking member and the inner end of the first telescopic channel.

[0010] Preferably, the side wall of the connecting shaft is recessed with a limiting groove, and the limiting member is assembled in the limiting groove.

[0011] Preferably, the end of the non-circular cylindrical groove is connected to a guide groove, which is a conical groove. The width of the conical groove gradually increases from the end near the non-circular cylindrical groove to the end away from the non-circular cylindrical groove. The radial width of the conical groove at the end away from the non-circular cylindrical groove is greater than the radial width of the non-circular cylindrical shaft.

[0012] Preferably, the non-circular cylindrical groove is a triangular, quadrilateral, pentagonal, hexagonal, heptagonal, octagonal, nonagonal, or decagonal cylindrical groove, and the non-circular cylindrical shaft is a triangular, quadrilateral, pentagonal, hexagonal, heptagonal, octagonal, nonagonal, or decagonal cylindrical shaft that matches the first mating member.

[0013] Preferably, the drive device further includes a drive motor installed in the main unit housing and a drive shaft disposed on the drive motor along the rotation axis. The non-circular cylindrical groove is disposed on the first docking member, and the non-circular cylindrical shaft is disposed on the second docking member. The free end of the output shaft is synchronously rotated by inserting and engaging the first docking member and the second docking member. The end of the output shaft away from its free end is synchronously rotated by inserting and engaging the drive shaft.

[0014] Preferably, the working component includes an eccentric structure fixed relative to the positioning shaft, and a polishing structure rotatably connected to the eccentric structure via an eccentric shaft arranged off-axis of rotation, wherein the eccentric structure is provided with a third telescopic channel for telescopic axis to telescopically extend and retract therein.

[0015] Preferably, the first locking assembly includes a first axial locking member and an unlocking button. The unlocking button includes a pressing member, a first circumferential locking member, and a connecting member connecting the pressing member and the first circumferential locking member. The connecting member is capable of elastically deflecting relative to the pressing member based on the force applied by the first circumferential locking member. The second locking assembly includes a second axial locking member and a second circumferential locking member. The second circumferential locking member includes a circumferential locking groove and a sliding groove arranged on one side of the circumferential locking groove and circumferentially around the rotation axis. The bottom surface of the sliding groove is set as a slope, and the height of the slope far from the circumferential locking groove is lower than the height of the end close to the circumferential locking groove. When the mounting structure rotates positively around the rotation axis, the second axial locking member gradually rotates to be axially locked with the first axial locking member. At the same time, the first circumferential locking member presses against the sliding groove and slides towards the top of the circumferential locking groove. In the axially locked state, the connecting member is gradually applied 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.

[0016] 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.

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

[0018] The power tool provided by this utility model can address situations where, during the assembly of working components, a non-circular cylindrical groove and a non-circular cylindrical shaft are misaligned, specifically when the second and first mating parts are misaligned. By having the first mating part press against the second mating part, the telescopic shaft and its free end (the second mating part) shorten relative to the positioning shaft, compressing the reset part. At this time, the operator can rotate the mounting structure forward along the rotation axis to engage the second and first locking components, achieving assembly between the mounting structure and the main housing. Although the second mating part is less prone to misalignment relative to the first mating part due to the frictional torque between them, this process is not ideal. The first docking part rotates, but after the main unit is turned on, the output shaft of the drive device rotates rapidly relative to the second docking part around the rotation axis. The rotational torque of the output shaft is often greater than the frictional torque between the first and second docking parts, which allows the first docking part to rotate relative to the second docking part. When the first docking part at the free end of the output shaft rotates to be aligned with the second docking part, the resetting force of the reset part drives the telescopic shaft and the first docking part at its free end to extend relative to the positioning shaft and engage with the first docking part. This allows the non-circular cylindrical shaft to engage with the non-circular cylindrical groove, achieving the alignment connection between the second and first docking parts, which facilitates the assembly of working components. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an electric tool according to an embodiment of the present invention.

[0020] Figure 2 This is a partial structural cross-sectional view of an embodiment of the power tool of this utility model.

[0021] Figure 3 This is an exploded view of a power tool according to an embodiment of the present invention.

[0022] Figure 4 This is an exploded view of the working components of an embodiment of the present invention.

[0023] Figure label:

[0024] Main unit 1; first docking part 11, guide groove 111; first shaft locking part 12; first peripheral locking part 13; pressing part 14; connecting part 15; main unit housing 101; drive device 102, output shaft 1021, drive motor 1022, drive shaft 1023;

[0025] Working component 2; second docking part 21; second shaft locking part 22; second peripheral locking part 23, peripheral locking groove 231, sliding groove 232, movable groove 233; positioning shaft 24, first telescopic channel 241, second telescopic channel 242; telescopic shaft 25, connecting shaft 251, limiting part 252; reset part 26; mounting structure 201; eccentric structure 202, third telescopic channel 2021; polishing structure 203; eccentric shaft 205;

[0026] Rotation axis L. Detailed Implementation

[0027] like Figures 1-4 As shown in the figure, as an embodiment of the present invention, a power tool that facilitates alignment and connection is provided, including a main unit 1 and a working component 2. The main unit 1 includes a main unit housing 101 and a drive device 102 installed inside the main unit housing 101. The output shaft 1021 of the drive device 102 is arranged along the rotation axis L. The free end of the output shaft 1021 is configured as a first mating member 11. The main unit housing 101 is provided with a first locking component arranged around the rotation axis L. The working component 2 includes a mounting structure 201, a working member rotatably connected to the mounting structure 201 via a positioning shaft 24 arranged along the rotation axis L, and a telescopic shaft 25 synchronously rotatably connected to the positioning shaft 24. The free end of the telescopic shaft 25 is configured as a second mating member 21. One of the first mating member 11 and the second mating member 21 is provided with a non-circular cylindrical groove, and the other is provided with a non-circular cylindrical shaft that engages with it. A reset member 26 is provided between the telescopic shaft 25 and the positioning shaft 24. The reset member 26 can be configured as a compression spring, elastic silicone, or other structure for resetting the telescopic shaft 25 after compression. The mounting structure 201 is provided with a second locking component, which is correspondingly arranged with the first locking component. When the mounting structure 201 rotates in the positive direction along the rotation axis L, the second locking component and the first locking component lock together. When the mounting structure 201 rotates, the second docking member 21 can be misaligned with the first docking member 11 and shortens relative to the positioning shaft 24 under the pressure of the outer end wall of the first docking member 11. After the second locking component and the first locking component lock together, when the output shaft 1021 rotates to align with the first docking member 11, the second docking member 21 can extend relative to the positioning shaft 24 under the reset force of the reset member 26 and insert into the first docking member 11.

[0028] In this embodiment, when a non-circular cylindrical groove and a non-circular cylindrical shaft are misaligned during the assembly of the working component 2 (i.e., the second docking member 21 and the first docking member 11 are misaligned), the first docking member 11 presses against the second docking member 21, causing the telescopic shaft 25 and its free end, the second docking member 21, to shorten relative to the positioning shaft 24 and compress the reset member 26. At this time, the operator can rotate the mounting structure 201 in the positive direction along the rotation axis L to drive the second locking component and the first locking component to lock together, realizing the mutual assembly between the mounting structure 201 and the main housing 101. Although at this time, the second docking member 21 is not easy to rotate relative to the first docking member 11 due to the frictional torque between it and the first docking member 11. However, after the host machine 1 is turned on, the output shaft 1021 of the drive device 102 rotates rapidly around the rotation axis L relative to the second docking member 21. The rotational torque of the output shaft 1021 is often greater than the frictional torque between the first docking member 11 and the second docking member 21, which allows the first docking member 11 to rotate relative to the second docking member 21. When the first docking member 11 at the free end of the output shaft 1021 rotates to be aligned with the second docking member 21, the resetting force of the resetting member 26 drives the telescopic shaft 25 and the first docking member 11 at its free end to extend relative to the positioning shaft 24 and engage with the first docking member 11, so that the non-circular cylindrical shaft and the non-circular cylindrical groove engage with each other, realizing the alignment connection between the second docking member 21 and the first docking member 11, which facilitates the assembly of the working component 2.

[0029] like Figure 2 As shown, in this embodiment, the positioning shaft 24 is provided with a first telescopic channel 241, and the second docking member 21 is telescopically connected to the first telescopic channel 241. The outer peripheral side of the second docking member 21 is set as a non-circular cylindrical structure. The first telescopic channel 241 is a non-circular cylindrical channel that matches the second docking member 21. When the telescopic shaft 25 moves telescopically relative to the positioning shaft 24, it can be guided and circumferentially limited by the movement of the second docking member 21 along the first telescopic channel 241, so that the telescopic shaft 25 moves smoothly telescopically relative to the positioning shaft 24, and the telescopic shaft 25 and the positioning shaft 24 can rotate synchronously. Thus, the torque of the output shaft 1021 is transmitted to the positioning shaft 24 through the first docking member 11 and the second docking member 21, and the positioning shaft 24 drives the working component to rotate around the rotation axis L. In other embodiments, the telescopic shaft can also be set as a telescopic sleeve outside the positioning shaft 24.

[0030] like Figure 2 , Figure 4As shown, in this embodiment, the telescopic shaft 25 further includes a connecting shaft 251 connected to the second docking member 21, and a limiting member 252 connected to the connecting shaft 251 at one end away from the second docking member 21. A second telescopic channel 242 communicating with the first telescopic channel 241 is provided through the positioning shaft 24, and the radial width of the connecting shaft 251 is smaller than the radial width of the second docking member 21, and the radial width of the second telescopic channel 242 is smaller than the radial width of the first telescopic channel 241. This allows the connecting shaft 251 to be telescopically connected within the second telescopic channel 242, with the second docking member 21 and the limiting member 252 respectively limiting it to both ends of the second telescopic channel 242, preventing the telescopic shaft 25 from falling off relative to the positioning shaft 24. A reset member 26 is sleeved on the outside of the connecting shaft 251 and presses against the inner end of the second docking member 21 and the inner end of the first telescopic channel 241.

[0031] like Figure 4 As shown, in this embodiment, a limiting groove is recessed in the side wall of the connecting shaft 251, and a limiting member 252 is assembled in the limiting groove to facilitate positioning of the limiting member 252 and prevent the limiting member 252 from moving axially relative to the connecting shaft 251. The limiting member 252 can be set as a retaining spring for easy assembly or disassembly.

[0032] like Figure 3 As shown, in this embodiment, a non-circular cylindrical groove is disposed on the first docking member 11, and a non-circular cylindrical shaft is disposed on the second docking member 21. A guide groove 111 is connected to the end of the non-circular cylindrical groove. The guide groove 111 is a conical groove, and the width of the conical groove gradually increases from the end near the non-circular cylindrical groove to the end away from the non-circular cylindrical groove. The radial width of the conical groove at the end away from the non-circular cylindrical groove is greater than the radial width of the non-circular cylindrical shaft. This ensures that during the assembly of the working component 2, even if the non-circular cylindrical shaft and the non-circular cylindrical groove are misaligned, the end face of the non-circular cylindrical shaft still abuts against the guide groove 111. This allows the non-circular cylindrical shaft to move along the guide groove 111 and gradually align and extend into the non-circular cylindrical groove when the output shaft 1021 rotates rapidly around the rotation axis L relative to the second docking member 21 after the host 1 is turned on. This guides the second docking member 21 and the first docking member 11 to quickly align and connect. In other embodiments, the non-circular cylindrical groove may be disposed on the second docking member 21, and the non-circular cylindrical shaft may be disposed on the first docking member 11.

[0033] In this embodiment, the non-circular cylindrical groove is a hexagonal cylindrical groove, and the non-circular cylindrical shaft is a hexagonal cylindrical shaft that matches the first mating member, resulting in a stable structure. In other embodiments, the non-circular cylindrical groove can also be set as a triangular, quadrilateral, pentagonal, heptagonal, octagonal, nonagonal, decagonal, heart-shaped, flower-shaped, or other polygonal cylindrical groove, and the non-circular cylindrical shaft can be set as a triangular, quadrilateral, pentagonal, heptagonal, octagonal, nonagonal, decagonal, heart-shaped, flower-shaped, or other polygonal cylindrical shaft that matches the first mating member.

[0034] like Figure 2 As shown, in this embodiment, the drive device 102 further includes a drive motor 1022 installed in the main housing 101 and a drive shaft 1023 arranged on the drive motor 1022 along the rotation axis L. The free end of the output shaft 1021 is connected to the second docking member 21 through the first docking member 11 for synchronous rotation. The end of the output shaft 1021 away from its free end is connected to the drive shaft 1023 through the first docking member 11 for synchronous rotation. This facilitates the assembly of the output shaft 1021 and transmits the torque of the drive shaft 1023 to the telescopic shaft 25 through the output shaft 1021.

[0035] like Figure 4 As shown, in this embodiment, the working component includes an eccentric structure 202 fixed relative to the positioning shaft 24, and a polishing structure 203 rotatably connected to the eccentric structure 202 via an eccentric shaft 205 arranged off-axis of rotation 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 positioning shaft 24 so that the polishing structure 203 can achieve a large-range, low-torque polishing or grinding effect. The eccentric structure 202 is provided with a third telescopic channel 2021 for the telescopic shaft 25 to extend and retract inward, which is used to accommodate part of the telescopic shaft 25 when it is shortened relative to the positioning shaft 24.

[0036] like Figure 3As shown, in this embodiment, the first locking assembly includes a first shaft locking member 12 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 can elastically deflect relative to the pressing member 14 based on the force applied by the first peripheral locking member 13. The second locking assembly includes a second shaft locking member 22 and a second peripheral locking member 23. 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 sliding groove 232 is set as a slope surface, and the height of the end of the slope surface away from the peripheral locking groove 231 is lower than the height of the end close to the peripheral locking groove 231. When the mounting structure 201 rotates in the positive direction around the rotation axis L, the second shaft locking member 22 gradually rotates until it is 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 and elastically deflected 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 assembling the working component 2, the operator only needs to rotate the mounting structure 201 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 in the positive direction around the rotation axis L, 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 mounting structure 201 from rotating relative to the main housing 101 or from falling off, and the operation is simple and convenient. During the rotation of the mounting structure 201, 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. The first circumferential locking member 13 gradually applies force to the connecting member 15 in the axially locked state, causing it 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. This allows the first circumferential locking member 13 to gradually apply force to the connecting member 15 in the axial locking limiting force of the first shaft locking member 12 and the second shaft locking member 22 during the rotation of the mounting structure 201, causing it to elastically deflect relative to the pressing member 14. Thus, the axial limiting force of the first shaft locking member 12 and the second shaft locking member 22 replaces the squeezing force applied by the operator to the working component 2 by manually squeezing it relative to the host 1. This makes assembly easy and effortless, and facilitates the assembly and replacement of the working component 2.

[0037] 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 mounting structure 201 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 release button by pressing the presser 14 to move it from the circumferential locking groove 231 into the movable groove 233, so that the first circumferential locking component 13 can be released from the circumferential locking groove 231. At this time, the first shaft locking component 12 and the second shaft locking component 22 are still in the axial locking state. The mounting structure 201 can rotate relative to the main unit 1 around the rotation axis L, but cannot move axially relative to the main unit housing 101. The operator only needs to rotate the mounting structure 201 in the opposite direction along the rotation axis L. The mounting structure 201 can simultaneously drive the second shaft lock 22 and the second peripheral lock 23 to rotate in opposite directions around the rotation axis L until the second shaft lock 22 rotates in opposite directions around the rotation axis L to release the axial lock with the first shaft lock 12, thus releasing the axial lock between the second shaft lock 22 and the first shaft lock 12. At the same time, the second peripheral lock 23 also rotates in opposite directions around the rotation axis L, so that the first peripheral lock 13 moves along the movable groove 233 away from the peripheral lock groove 231, preventing the first peripheral lock 13 from returning to the peripheral lock groove 231.

[0038] 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.

[0039] 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.

[0040] 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 main unit housing 101, 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 in the circumferential direction along the rotation axis L are respectively configured as surface structures that match the surface of the two side walls arranged in the circumferential direction along 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 in the circumferential direction along the rotation axis L can respectively abut against the two side walls arranged in the circumferential direction along 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 wall of the movable groove 233 closest to the rotation axis L 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 wall of the movable groove 233 closest to the rotation axis L 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 main housing 101. 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.

[0041] 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 facilitates alignment and connection, characterized in that, include: The host includes a host housing and a drive device installed inside the host housing. The output shaft of the drive device is arranged along the axis of rotation, and the free end of the output shaft is configured as a first mating part. The host housing is provided with a first locking assembly arranged around the axis of rotation. The working assembly includes a mounting structure, a working component rotatably connected to the mounting structure via a positioning shaft arranged along a rotation axis, and a telescopic shaft synchronously rotatably connected to the positioning shaft. The free end of the telescopic shaft is configured as a second mating member. One of the first mating member and the second mating member is provided with a non-circular cylindrical groove, and the other is provided with a non-circular cylindrical shaft that engages with it. A reset member is provided between the telescopic shaft and the positioning shaft, and a second locking assembly is provided on the mounting structure. The mounting structure rotates along the rotation axis in the forward direction, causing the second locking component to lock with the first locking component. When the mounting structure rotates, the second docking member can be misaligned with the first docking member and shortens relative to the positioning shaft under the pressure of the outer end wall of the first docking member. After the second locking component and the first locking component lock with each other, the second docking member can extend relative to the positioning shaft and insert with the first docking member under the reset force of the reset component when the output shaft rotates to align with the first docking member.

2. The power tool according to claim 1, characterized in that: The positioning shaft is provided with a first telescopic channel, and the second docking member is telescopically connected to the first telescopic channel. The outer peripheral side of the second docking member is set as a non-circular cylindrical structure. The first telescopic channel is a non-circular cylindrical channel that matches the second docking member. When the telescopic shaft moves telescopically relative to the positioning shaft, it can be guided and circumferentially limited by the movement of the second docking member along the first telescopic channel.

3. The power tool according to claim 2, characterized in that: The telescopic shaft also includes a connecting shaft connected to the second docking member and a limiting member connected to the connecting shaft at one end away from the second docking member. A second telescopic channel communicating with the first telescopic channel is provided through the positioning shaft, and the radial width of the connecting shaft is smaller than the radial width of the second docking member, and the radial width of the second telescopic channel is smaller than the radial width of the first telescopic channel. The connecting shaft is telescopically connected inside the second telescopic channel, and the second docking member and the limiting member are respectively limited to the two ends of the second telescopic channel. The reset member is sleeved outside the connecting shaft and presses against the inner end of the second docking member and the inner end of the first telescopic channel.

4. The power tool according to claim 3, characterized in that: The side wall of the connecting shaft is recessed with a limiting groove, and the limiting component is assembled in the limiting groove.

5. The power tool according to claim 1, characterized in that: The end of the non-circular cylindrical groove is connected to a guide groove, which is a conical groove. The width of the conical groove gradually increases from the end near the non-circular cylindrical groove to the end away from the non-circular cylindrical groove. The radial width of the conical groove at the end away from the non-circular cylindrical groove is greater than the radial width of the non-circular cylindrical shaft.

6. The power tool according to claim 1, characterized in that: The non-circular cylindrical groove is a triangular, quadrilateral, pentagonal, hexagonal, heptagonal, octagonal, nonagonal, or decagonal cylindrical groove, and the non-circular cylindrical shaft is a triangular, quadrilateral, pentagonal, hexagonal, heptagonal, octagonal, nonagonal, or decagonal cylindrical shaft that matches the first mating part.

7. The power tool according to claim 1, characterized in that: The drive device also includes a drive motor installed inside the main unit housing and a drive shaft arranged on the drive motor along the rotation axis. The non-circular cylindrical groove is arranged on the first docking member, and the non-circular cylindrical shaft is arranged on the second docking member. The free end of the output shaft is synchronously rotated by inserting and engaging the first docking member and the second docking member. The end of the output shaft away from its free end is synchronously rotated by inserting and engaging the drive shaft.

8. The power tool according to any one of claims 1-7, characterized in that: The working component includes an eccentric structure fixed relative to the positioning shaft and a polishing structure rotatably connected to the eccentric structure via an eccentric shaft arranged off-axis of rotation. The eccentric structure is provided with a third telescopic channel for telescopic axis to extend and retract within it.

9. The power tool according to any one of claims 1-7, characterized in that: The first locking assembly includes a first shaft locking member and an unlocking button. The unlocking button includes a pressing member, a first peripheral locking member, and a connecting member connected between 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 second locking assembly includes a second shaft locking member and a second circumferential locking member. 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. 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 mounting structure rotates in the forward direction around the rotation axis, the second shaft locking member gradually rotates until it is 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.

10. The power tool according to claim 9, characterized in that: 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.

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