CN117733799A - Quick change device and electric tool - Google Patents

Abstract

The invention relates to the technical field of electric tools and discloses a quick-change device and an electric tool, wherein the quick-change device is arranged on a machine shell assembly and comprises a clamping assembly and a rotating arm assembly, the clamping assembly comprises a first elastic piece, a static pressure assembly and a dynamic pressure assembly, the rotating arm assembly is rotatably arranged on the machine shell assembly and comprises a rotating arm, the rotating arm comprises a notch part and a force application part, the rotating arm is provided with a first working state in which the top of the dynamic pressure assembly is arranged in the notch part, and a second working state in which the force application part applies force to the dynamic pressure assembly, and in the second working state, the dynamic pressure assembly moves in a direction far away from the static pressure assembly so as to loosen a working accessory. When the working accessory is replaced, the rotating arm is adjusted to move, so that the force application part applies an acting force to the top of the dynamic pressure component, the dynamic pressure component is stressed to move downwards, the dynamic pressure component is separated from the static pressure component, the working accessory is replaced, the working accessory can be quickly replaced by one hand, and the convenience of replacing the accessory is improved.

Description

Quick change device and electric tool

Technical Field

The present invention relates to the field of power tools, and in particular, to a quick-change device and a power tool.

Background

This section provides merely background information related to the present disclosure and is not necessarily prior art.

At present, along with the maturation of electric tool technology, the function of multi-functional electric tool is perfected gradually, and construction such as saw cutting shovel planing mill can be accomplished to the work annex of changing multi-functional electric tool, but current multi-functional electric tool change annex still is comparatively inconvenient. When some electric tools are used for replacing accessories, the unlocking lever is required to be shifted for 180 degrees to unlock, and after the accessories are replaced, the unlocking lever is reset; or the unlocking lever is rotated by 90 degrees to unlock, and the unlocking lever is reset after the accessory is replaced. There are also some power tools with triggers at the bottom, but pressing the unlocking lever with one hand is laborious due to the shorter trigger.

Disclosure of Invention

The invention aims to at least solve the problem that the existing electric tool is inconvenient to replace accessories. The aim is achieved by the following technical scheme:

a first aspect of the present invention provides a quick-change device mounted to a housing assembly, comprising:

the clamping assembly is arranged at one end of the shell assembly and comprises a first elastic piece, a static pressure assembly and a dynamic pressure assembly, and the dynamic pressure assembly is used for abutting against the static pressure assembly under the elastic action of the first elastic piece so as to clamp the working accessory;

the rotating arm assembly is rotationally arranged on the shell assembly and comprises a rotating arm, the rotating arm is provided with a notch part and a force application part, the rotating arm is provided with a first working state in which the top of the dynamic pressure assembly is arranged in the notch part, and a second working state in which the force application part is used for applying acting force to the dynamic pressure assembly, and in the second working state, the dynamic pressure assembly moves in a direction away from the static pressure assembly so as to loosen the working accessory.

According to the quick-change device, the clamping component is arranged, the movable dynamic pressure component is driven to press the static pressure component through the first elastic piece to clamp the working accessory when the clamping component works, the dynamic pressure component is abutted to the static pressure component through the first elastic piece, and the working accessory (the cutting piece, the polishing piece and the like) is clamped between the dynamic pressure component and the static pressure component, so that the working component can be fixed. When the working accessory is replaced, the rotating arm can move along the axial direction by pressing the rotating arm, so that the relative positions of the notch part and the force application part of the rotating arm and the dynamic pressure assembly can be adjusted. When the force application part applies acting force to the top of the dynamic pressure component, the dynamic pressure component is stressed to move downwards, so that the dynamic pressure component is separated from the static pressure component, the working accessory can be replaced by one hand, and the convenience of replacing the accessory is improved. After the replacement is completed, the relative positions of the rotating arm and the dynamic pressure assembly are adjusted along the axial direction, the top of the dynamic pressure assembly is arranged in the notch part, the rotating arm is restored to the first working state, and at the moment, the dynamic pressure assembly is abutted with the static pressure assembly under the action of the elastic force of the first elastic piece, so that the working accessory is fixed.

In addition, the quick-change device according to the invention can also have the following additional technical features:

in some embodiments of the present invention, the quick-change device further includes a locking structure, where the locking structure includes a locking member and a locking mating portion, the locking member is disposed on one of the rotating arm and the housing assembly, the locking mating portion is disposed on the other of the rotating arm and the housing assembly, and the locking member mates with the locking mating portion to lock or unlock the rotating arm.

In some embodiments of the present invention, the locking member includes a latch, the latch is disposed on the rotating arm, the locking mating portion includes a locking block, the locking block is disposed on a side of the housing assembly near the latch, and the latch is rotatably engaged with the locking block.

In some embodiments of the present invention, the lock catch includes a connection portion and a locking portion, the connection portion is connected with the rotating arm, the locking portion is disposed at the bottom of the connection portion, the locking block is provided with a clamping groove, and the locking portion is clamped in the clamping groove.

In some embodiments of the invention, the rotating arm assembly further comprises a second elastic member, the second elastic member is disposed near a rotatable side of the rotating arm, and the rotating arm moves axially under the elastic action of the second elastic member.

In some embodiments of the present invention, the rotating arm assembly further includes a connection assembly including a rotating shaft and a connection sleeve, the connection sleeve is sleeved outside the rotating arm, the second elastic member is disposed between the rotating arm and the connection sleeve, and the connection sleeve is rotatably connected with the housing assembly through the rotating shaft.

In some embodiments of the present invention, an opening is provided at the bottom of the connecting sleeve, the opening is provided corresponding to the dynamic pressure assembly, and in the first working state, the top of the dynamic pressure assembly extends into the notch portion through the opening.

In some embodiments of the present invention, the connection assembly includes a rotating shaft, a mounting groove is disposed on a rotatable side of the rotating arm, near the rotating arm, along an axial direction of the rotating arm, a through groove is disposed at the mounting groove, perpendicular to the axial direction of the mounting groove, the second elastic member is disposed in the mounting groove, the rotating shaft is disposed in the through groove, perpendicular to the axial direction of the mounting groove, the rotating arm is rotatably connected with the housing assembly through the rotating shaft, and the through groove can axially move along the mounting groove relative to the rotating shaft.

In some embodiments of the present invention, the dynamic pressure assembly includes a first rod body and a first pressure plate, the static pressure assembly includes a second pressure plate, the first rod body is inserted into the housing assembly, the first elastic member is sleeved on the first rod body, the first elastic member is disposed between the housing assembly and one end of the first rod body, the first pressure plate is sleeved on the other end of the first rod body, the second pressure plate is disposed on the upper portion of the first pressure plate, and the first pressure plate is used for abutting against the second pressure plate under the elastic action of the first elastic member to clamp the working accessory.

Another aspect of the present invention provides a power tool including a housing assembly and a quick change device as described in any of the above.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

fig. 1 schematically shows a schematic structure of a power tool according to an embodiment of the present invention;

fig. 2 schematically shows a schematic structure of a rotary arm according to a first embodiment of the present invention;

fig. 3 schematically shows a cross-sectional view of a rotary arm according to a first embodiment of the present invention in a first operating state;

fig. 4 schematically shows a partial cross-sectional view of a rotary arm according to a first embodiment of the present invention in a first operating state;

fig. 5 schematically shows a cross-sectional view of a rotary arm according to a first embodiment of the present invention in a second operating state;

fig. 6 schematically shows a partial cross-sectional view of a rotary arm according to a first embodiment of the present invention in a second operating state;

fig. 7 schematically shows a schematic structural view of a rotary arm according to a second embodiment of the present invention;

fig. 8 schematically shows a partial cross-sectional view of a rotary arm according to a second embodiment of the present invention in a first operating state;

fig. 9 schematically shows a partial cross-sectional view of a rotary arm according to a second embodiment of the present invention in a second operating state.

The reference numerals are as follows:

1. a housing assembly; 10. a head shell; 100. a mounting sleeve; 11. a housing;

20. a first elastic member; 21. a first rod body; 22. a first platen; 23. a second platen;

30. a work attachment;

40. a rotating arm; 400. a rotating arm main body; 401. a notch portion; 402. a force application part; 403. a mounting groove; 404. a through groove; 41. a second elastic member;

50. locking; 500. a connection part; 501. a locking part; 51. a locking block;

60. connecting sleeves; 61. a rotating shaft;

70. a fork assembly; 71. and (3) an eccentric shaft.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For ease of description, spatially relative terms, such as "inner," "outer," "lower," "below," "upper," "above," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein interpreted accordingly.

As shown in fig. 1 to 9, according to an embodiment of the present invention, a quick-change device is provided and mounted on a casing assembly 1, the quick-change device includes a clamping assembly and a rotating arm assembly, the clamping assembly is disposed at one end of the casing assembly 1, the clamping assembly includes a first elastic member 20, a static pressure assembly and a dynamic pressure assembly, the dynamic pressure assembly is used for abutting against the static pressure assembly under the elastic action of the first elastic member 20 to clamp a working attachment 30, the rotating arm assembly is rotatably disposed on the casing assembly 1, the rotating arm assembly includes a rotating arm 40, the rotating arm 40 has a notch 401 and a force application portion 402, the rotating arm 40 has a first working state in which the top of the dynamic pressure assembly is disposed in the notch 401, and a second working state in which the force application portion 402 applies a force to the dynamic pressure assembly, and in the second working state, the dynamic pressure assembly moves in a direction away from the static pressure assembly to release the working attachment 30.

The casing assembly 1 includes a head shell 10, an installation cavity is formed in the head shell 10 and is used for installing a clamping assembly, one end of a rotating arm assembly is rotationally connected with the head shell 10, the principle of the clamping assembly is that a movable dynamic pressure assembly is driven by a first elastic piece 20 to press on a static pressure assembly so as to clamp a working accessory 30, the dynamic pressure assembly and the static pressure assembly are both provided with a clamping plane capable of clamping the working accessory 30, and the moving direction of the dynamic pressure assembly is perpendicular to the clamping plane. The first elastic member 20 may be a spring structure, where the first elastic member 20 is disposed along a moving direction of the dynamic pressure assembly, and the first elastic member 20 is used for resetting the dynamic pressure assembly after moving along an axial direction. The principle of the quick-change device is that the rotating arm 40 is moved along the axial direction of the rotating arm 40 under the action of the elastic force of the second elastic piece 41 by pressing the rotating arm 40, the contact position between the bottom of the rotating arm 40 and the dynamic pressure assembly can be adjusted, the bottom of the rotating arm 40 is contacted with the top of the dynamic pressure assembly, the dynamic pressure assembly is moved downwards by pressing the rotating arm 40 downwards, so that the dynamic pressure assembly is separated from the static pressure assembly, and the working attachment 30 is loosened, so that the working attachment 30 can be replaced conveniently.

According to the quick-change device, the clamping assembly is arranged, the movable dynamic pressure assembly is driven to press on the static pressure assembly through the first elastic piece 20 when the clamping assembly works so as to clamp the working accessory 30, the clamping assembly abuts against the static pressure assembly through the first elastic piece 20, and the working accessory 30 (the cutting piece, the polishing piece and the like) is clamped between the dynamic pressure assembly and the static pressure assembly, so that the working assembly can be fixed. When the work attachment 30 is replaced, the rotary arm 40 is pushed to move the rotary arm 40 in the axial direction, so that the relative positions of the notch 401 and the force applying portion 402 of the rotary arm 40 and the dynamic pressure assembly can be adjusted. When the force application part 402 applies force to the top of the dynamic pressure assembly, the dynamic pressure assembly is forced to move downwards, so that the dynamic pressure assembly is separated from the static pressure assembly, the working accessory 30 can be replaced by a single hand, and the convenience of replacing the accessory is improved. After the replacement is completed, the relative positions of the rotating arm 40 and the dynamic pressure assembly are adjusted along the axial direction, so that the top of the dynamic pressure assembly is arranged in the notch 401, the rotating arm 40 is restored to the first working state, and at the moment, the dynamic pressure assembly is abutted with the static pressure assembly under the action of the elastic force of the first elastic piece 20, and the working accessory 30 is fixed.

In some embodiments of the present invention, the dynamic pressure assembly includes a first rod 21 and a first pressure plate 22, the static pressure assembly includes a second pressure plate 23, the first rod 21 is inserted into the housing assembly 1, the first elastic member 20 is sleeved on the first rod 21, the first elastic member 20 is disposed between the housing assembly 1 and one end of the first rod 21, the first pressure plate 22 is sleeved on the other end of the first rod 21, the second pressure plate 23 is disposed on an upper portion of the first pressure plate 22, and the first pressure plate 22 is used for abutting against the second pressure plate 23 under the elastic action of the first elastic member 20 to clamp the working attachment 30. Specifically, the first rod body 21 is of a cylindrical rod structure, the first pressure plate 22 is of a disc-shaped structure, the installation sleeve 100 is arranged in the head shell 10, an installation cavity is formed in the installation sleeve 100, a step structure is formed in the installation cavity, the step structure is reduced from top to bottom, the first rod body 21 is inserted in the installation cavity and moves along the axial direction of the installation cavity, the first elastic piece 20 is sleeved outside the first rod body 21, one end of the first elastic piece 20 is abutted to the step structure, the other end of the first elastic piece 20 is abutted to one end of the first rod body 21, a first through hole is formed in the center of the first pressure plate 22, the first pressure plate 22 is sleeved at the bottom of the first rod body 21 through the first through hole, and the first pressure plate can be fixed in an interference connection mode through fastening or bolts. Similarly, the second pressure plate 23 is also in a disc structure, and the second pressure plate 23 can be sleeved outside the mounting sleeve 100 in an interference connection or a clamping connection or a bolt connection manner. The side of the second platen 23 facing the first platen 22 and the side of the first platen 22 facing the second platen 23 may be provided with protrusions or mating holes for mounting the work attachment 30, for example, to mate with locating holes on the work attachment 30 for securing the work attachment 30. When the rotary arm 40 applies pressure to the top of the first rod 21, the first rod 21 moves downward to compress the first spring, and the elastic force of the first elastic member 20 drives the first pressure plate 22 connected with the first elastic member to move downward, so that the first pressure plate 22 is separated from the second pressure plate 23, and the working attachment 30 is convenient to replace. The mounting sleeve 100 is further sleeved with a shifting fork assembly 70, one end of the shifting fork assembly 70 is connected with the eccentric shaft 71, one end of the eccentric shaft 71 is connected with the shifting fork assembly 70, the other end of the eccentric shaft 71 is connected with the output end of the power source, when the output end of the power source rotates, the eccentric shaft 71 is driven to move along a preset circular track, so that the shifting fork assembly 70 also moves along the preset circular track, and because one end of the shifting fork assembly 70 is rotatably sleeved on the mounting sleeve 100, the mounting sleeve 100 is driven by the shifting fork assembly 70 to rotate clockwise by a certain angle and then rotate anticlockwise by a certain angle, and further the working accessory 30 fixed with the pressing assembly is driven to rotate clockwise by a certain angle and then rotate anticlockwise by a certain angle, and accordingly construction operations such as sawing, grinding and the like are achieved.

In some embodiments of the present invention, the quick-change device further includes a locking structure, where the locking structure includes a locking member and a locking mating portion, the locking member is disposed on one of the rotating arm 40 and the housing assembly 1, the locking mating portion is disposed on the other of the rotating arm 40 and the housing assembly 1, and the locking member mates with the locking mating portion to lock or unlock the rotating arm 40. The rotating arm 40 is connected and locked with the locking matching part through the locking piece, so that the rotating arm 40 is in a locking state, and the dynamic pressure assembly compresses the static pressure assembly under the action of the first elastic piece 20, so that the working accessory 30 arranged between the dynamic pressure assembly and the static pressure assembly is compressed and fixed. When the locking piece is separated from the locking matching part, the rotating arm 40 is in an unlocking state, and the dynamic pressure assembly and the static pressure assembly are separated at the moment, so that the working accessory 30 can be replaced conveniently.

In some embodiments of the present invention, the locking member includes a latch 50, the latch 50 is disposed on the rotating arm 40, the locking mating portion includes a locking block 51, the locking block 51 is disposed on a side of the housing assembly 1 near the latch 50, and the latch 50 is rotatably clamped to the locking block 51. In this embodiment, the lock catch 50 is disposed in the middle of the rotating arm 40 or far away from one side of the rotating arm 40 rotationally connected with the head shell 10, the lock catch 50 includes a connection portion 500 and a locking portion 501, the connection portion 500 is connected with the rotating arm 40, the locking portion 501 is disposed at the bottom of the connection portion 500, the locking portion 501 and the connection portion 500 are in a cylindrical structure, the cross-sectional area of the locking portion 501 is larger than that of the connection portion 500, the locking block 51 is disposed on the head shell 10 and corresponds to the lock catch 50, a clamping groove is disposed at one end of the locking block 51 facing the rotating shaft 61, and the cross-sectional area of the clamping groove is larger than that of the connection portion 500 and smaller than that of the locking portion 501, so as to prevent the locking portion 501 from falling out of the clamping groove, and ensure stability and reliability of the locking structure. By pressing the rotating arm 40 to make the lock catch 50 extend into or separate from the locking block 51 through the clamping groove, when the rotating arm 40 is pressed to make the lock catch 50 extend into the locking block 51 through the notch, please refer to fig. 2, fig. 2 shows that the lock catch 50 is matched with the locking block 51, so that the rotating arm 40 is in a locking state, and the first pressure plate 22 and the second pressure plate 23 are pressed against the working accessory 30. When the rotary arm 40 is pressed to release the lock catch 50 from the locking block 51 through the notch, as shown in fig. 4, fig. 4 shows that the lock catch 50 is unlocked from the locking block 51, so that the rotary arm 40 is in an unlocked state, at this time, the rotary arm 40 moves upward through the rotating shaft 61, and simultaneously, the rotary arm 40 moves to a side far away from the second elastic element 41 under the action of the second elastic element 41, so that the bottom of the rotary arm 40 contacts with the top of the first rod 21, and then the rotary arm 40 is pressed downward to drive the first rod 21 to move downward, so that the dynamic pressure assembly and the static pressure assembly are separated, and the working accessory 30 is replaced.

In some embodiments of the present invention, the rotating arm assembly further includes a second elastic member 41, the second elastic member 41 is disposed near a rotatable side of the rotating arm 40, and the rotating arm 40 moves axially under the elastic action of the second elastic member 41. Specifically, the rotary arm 40 includes a rotary arm body 400, a second elastic member 41 is disposed near a rotating end of the rotary arm body 400, the second elastic member 41 may be a spring structure, and the rotary arm body 400 may move axially under the action of the second elastic member 41. When the rotary arm body 400 compresses the second elastic member 41 to move along the rotatable side near the rotary arm 40, the top of the first rod 21 is disposed in the notch 401, and the rotary arm 40 is in the first working state, and the first pressure plate 22 abuts against the second pressure plate 23 to compress the working attachment 30. When the rotating arm body 400 moves along the rotatable side far away from the rotating arm 40 under the elastic force of the second elastic member 41, and when the force is applied to the top of the first rod body 21 by the force applying portion 402, the dynamic pressure assembly is forced to move downward, so that the dynamic pressure assembly is separated from the static pressure assembly, and the working attachment 30 can be replaced.

In some embodiments of the present invention, the rotating arm assembly further includes a connection assembly including a connection sleeve 60 and a rotation shaft 61, the connection sleeve 60 is sleeved outside the rotating arm 40, the second elastic member 41 is disposed between the rotating arm 40 and the connection sleeve 60, and the connection sleeve 60 is connected to the housing assembly 1 through the rotation shaft 61. Specifically, as shown in fig. 2 to 6, the connecting sleeve 60 is sleeved outside the rotating arm main body 400, the end portion of the connecting sleeve 60 is provided with a shaft hole, the rotating shaft 61 is arranged in the shaft hole, the connecting sleeve 60 is hinged with the head shell 10 through the rotating shaft 61, one end of the rotating arm main body, which is far away from the rotating shaft 61, is used for being pulled by a user, the other end of the rotating arm main body is abutted with the second elastic piece 41, the second elastic piece 41 can be in a spring structure, the second elastic piece 41 is arranged along the axial direction of the connecting sleeve 60, and the rotating arm can move relative to the connecting sleeve 60 along the axial direction of the connecting sleeve 60 under the elastic action of the second elastic piece 41. The bottom of the connecting sleeve 60 is provided with an opening, the opening is correspondingly arranged with the first rod body 21, namely, the opening is arranged at the position relatively above the first rod body 21 along the height direction, when the working accessory 30 needs to be replaced, a user presses the rotating arm 40, so that the rotating arm 40 moves along the direction away from the second elastic piece 41 under the action of the elastic force of the second elastic piece 41, meanwhile, the rotating arm 40 is lifted upwards, the lock catch 50 is separated from the locking block 51, when the rotating arm 40 moves to the position of the notch 401 and the opening, the rotating arm 40 is pressed downwards, the top of the first rod body 21 is contacted with the bottom of the rotating arm 40, and then the rotating arm 40 is continuously pressed downwards, so that the rotating arm 40 drives the dynamic pressure assembly to move downwards, and the first pressure plate 22 is separated from the second pressure plate 23, so that the working accessory 30 can be removed and replaced. After the accessory is replaced, the rotary arm 40 is pressed to enable the rotary arm 40 to compress the second spring, meanwhile, the rotary arm 40 is pressed downwards, the lock catch 50 stretches into the locking block 51 to be locked, and the first pressure plate 22 and the second pressure plate 23 are enabled to press the working accessory 30.

In other embodiments, the rotating arm assembly may be provided with only the connecting sleeve 60, and the second elastic member 41 is not provided, so that the rotating arm main body 400 slides opposite or opposite to the connecting sleeve 60 by an external force, and the function of adjusting the positions of the notch 401 and the top of the first rod 21 can be achieved.

In some embodiments of the present invention, the connection assembly includes a rotating shaft 61, a mounting groove 403 is axially disposed on a rotatable side of the rotating arm 40 near the rotating arm 40, a through groove 404 is axially disposed in the mounting groove 403 perpendicular to the mounting groove 403, the second elastic member 41 is disposed in the mounting groove 403, the rotating shaft 61 is disposed in the through groove 404 along an axial direction of the perpendicular mounting groove 403, the rotating arm 40 is rotatably connected to the housing assembly 1 through the rotating shaft 61, and the through groove 404 can axially move along the mounting groove 403 relative to the rotating shaft 61. Specifically, as shown in fig. 7 to 9, the rotary arm body 400 compresses the second elastic member 41, and the through slot 404 moves toward an end far away from the second elastic member 41 relative to the rotating shaft 61, so that the top of the first rod 21 is disposed in the notch 401, and at this time, the rotary arm 40 is in the first working state, and the first pressure plate 22 abuts against the second pressure plate 23 to compress the working attachment 30. When the rotary arm body 400 moves along the rotatable side away from the rotary arm 40 under the elastic force of the second elastic member 41, the through groove 404 moves toward one end close to the second elastic member 41 relative to the rotary shaft 61, so that the force application portion 402 applies force to the top of the first rod 21, and the dynamic pressure assembly is forced to move downward, so that the dynamic pressure assembly is separated from the static pressure assembly, and the working attachment 30 can be replaced.

A second aspect of the present invention provides a power tool comprising a housing assembly 1 and the quick-change device described above. The shell assembly 1 further comprises a shell 11, the shell 11 comprises a structure that two half shells are in butt joint to form a complete shell, the two half shells can be matched in a clamping mode or are fixed through screw connection, an installation cavity is formed in the shell 11 and used for installing each component of an electric tool, the head shell 10 is arranged at the head end of the shell 11, and the quick-change device is installed at the head end of the shell 11 and can be used conveniently. The electric tool according to the second aspect of the present invention has the same advantages as the quick-change device according to the first aspect of the present invention, and will not be described herein. In addition, the top of the shell component 1 is provided with a through groove capable of accommodating the rotating arm 40, the length of the through groove is greater than that of the rotating arm 40 so as to press the rotating arm 40, the rotating arm 40 can be placed in the through groove when locked, the rotating arm component can be completely contained in the shell component 1, and the attractive appearance is ensured, and meanwhile, the use is not influenced.

The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims (10)

1. A quick change device mounted to a housing assembly, comprising:

the clamping assembly is arranged at one end of the shell assembly and comprises a first elastic piece, a static pressure assembly and a dynamic pressure assembly, and the dynamic pressure assembly is used for abutting against the static pressure assembly under the elastic action of the first elastic piece so as to clamp the working accessory;

the rotating arm assembly is rotationally arranged on the shell assembly and comprises a rotating arm, the rotating arm is provided with a notch part and a force application part, the rotating arm is provided with a first working state in which the top of the dynamic pressure assembly is arranged in the notch part, and a second working state in which the force application part is used for applying acting force to the dynamic pressure assembly, and in the second working state, the dynamic pressure assembly moves in a direction away from the static pressure assembly so as to loosen the working accessory.

2. The quick-change device of claim 1, further comprising a locking structure, the locking structure comprising a locking member and a locking mating portion, the locking member being disposed on one of the rotating arm and the housing assembly, the locking mating portion being disposed on the other of the rotating arm and the housing assembly, the locking member mating with the locking mating portion to lock or unlock the rotating arm.

3. The quick-change device of claim 2, wherein the locking member comprises a latch disposed on the rotating arm, the locking engagement portion comprises a locking block disposed on a side of the housing assembly adjacent to the latch, and the latch is rotatably engaged with the locking block.

4. A quick-change device according to claim 3, wherein the lock catch comprises a connecting portion and a locking portion, the connecting portion is connected with the rotating arm, the locking portion is arranged at the bottom of the connecting portion, the locking block is provided with a clamping groove, and the locking portion is clamped in the clamping groove.

5. The quick-change device according to claim 1, wherein the rotating arm assembly further comprises a second elastic member disposed adjacent to a rotatable side of the rotating arm, the rotating arm axially moving under the elastic action of the second elastic member.

6. The quick-change device of claim 5, wherein the rotating arm assembly further comprises a connecting assembly, the connecting assembly comprises a rotating shaft and a connecting sleeve, the connecting sleeve is sleeved outside the rotating arm, the second elastic piece is arranged between the rotating arm and the connecting sleeve, and the connecting sleeve is rotatably connected with the housing assembly through the rotating shaft.

7. The quick-change device according to claim 6, wherein an opening is provided in the bottom of the connecting sleeve, the opening being provided in correspondence with the dynamic pressure assembly, and in the first operating state, the dynamic pressure assembly top extends into the notch portion through the opening.

8. The quick-change device according to claim 6, wherein the connection assembly comprises a rotating shaft, a mounting groove is formed in a rotatable side of the rotating arm, which is close to the rotating arm, along an axial direction of the rotating arm, a through groove is formed in the mounting groove, perpendicular to the axial direction of the mounting groove, the second elastic piece is arranged in the mounting groove, the rotating shaft is arranged in the through groove along an axial direction perpendicular to the mounting groove, the rotating arm is rotatably connected with the housing assembly through the rotating shaft, and the through groove can axially move along the mounting groove relative to the rotating shaft.

9. The quick-change device of any one of claims 1-8, wherein the dynamic pressure assembly comprises a first rod and a first pressure plate, the static pressure assembly comprises a second pressure plate, the first rod is inserted into the housing assembly, the first elastic member is sleeved on the first rod, the first elastic member is arranged between the housing assembly and one end of the first rod, the first pressure plate is sleeved on the other end of the first rod, the second pressure plate is arranged on the upper portion of the first pressure plate, and the first pressure plate is used for abutting against the second pressure plate under the elastic action of the first elastic member to clamp the working accessory.

10. A power tool comprising a housing assembly and a quick change device according to any one of claims 1 to 9.