CN221640769U - Quick change device and electric tool - Google Patents

Abstract

The utility model 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 power tool

Technical Field

The utility model relates to the technical field of electric tools, in particular to a quick-change device and an electric tool.

Background Art

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

At present, with the maturity of power tool technology, the functions of multifunctional power tools are gradually improved. By replacing the working accessories of multifunctional power tools, sawing, shoveling, planing, grinding and other operations can be completed. However, it is still inconvenient to replace the accessories of existing multifunctional power tools. When replacing accessories, some power tools need to turn the unlocking lever 180 degrees to unlock, and then reset the unlocking lever after replacing the accessories; or rotate the unlocking lever 90 degrees to unlock, and then reset the unlocking lever after replacing the accessories. There are also some power tools whose trigger is at the bottom, but because the trigger is short, it is more difficult to press the unlocking lever with one hand.

Utility Model Content

The purpose of the utility model is to at least solve the problem that it is inconvenient to replace accessories of existing power tools. This purpose is achieved through the following technical solutions:

The first aspect of the utility model provides a quick-change device installed on a housing assembly, comprising:

A clamping assembly, arranged at one end of the housing assembly, the clamping assembly comprising a first elastic member, a static pressure assembly and a dynamic pressure assembly, the dynamic pressure assembly being used to abut against the static pressure assembly under the elastic action of the first elastic member to clamp the working accessory;

A rotating arm assembly is rotatably arranged on the housing assembly, and the rotating arm assembly includes a rotating arm, the rotating arm having a notch portion and a force-applying portion, the rotating arm having a first working state in which the top of the dynamic pressure assembly is placed in the notch portion, and a second working state in which the force-applying portion applies a force to the dynamic pressure assembly, in which the dynamic pressure assembly moves in a direction away from the static pressure assembly to release the working accessory.

The quick-change device of the utility model is provided with a clamping assembly. When the clamping assembly is working, the first elastic member drives the movable dynamic pressure assembly to press on the static pressure assembly to clamp the working accessory. The clamping assembly abuts the dynamic pressure assembly with the static pressure assembly through the first elastic member, and the working accessory (cutting disc, grinding disc, etc.) is clamped between the dynamic pressure assembly and the static pressure assembly, so that the working assembly can be fixed. When replacing the working accessory, the rotating arm is pressed so that the rotating arm can move along its axial direction, and then the relative position of the notch and the force-applying part of the rotating arm and the dynamic pressure assembly can be adjusted. When the force-applying part applies a force to the top of the dynamic pressure assembly, the dynamic pressure assembly is forced to move downward, so that the dynamic pressure assembly is separated from the static pressure assembly, so that the working accessory can be replaced. The working accessory can be quickly replaced with one hand, which improves the convenience of replacing the accessory. After the replacement is completed, the relative position of the rotating arm and the dynamic pressure assembly is adjusted axially so that the top of the dynamic pressure assembly is placed in the notch, and the rotating arm is restored to the first working state. At this time, under the action of the elastic force of the first elastic member, the dynamic pressure assembly abuts against the static pressure assembly to fix the working accessory.

In addition, the quick-change device according to the utility model may also have the following additional technical features:

In some embodiments of the present invention, the quick-change device also includes a locking structure, which includes a locking piece and a locking mating portion, wherein the locking piece is disposed on one of the rotating arm and the housing assembly, and the locking mating portion is disposed on the other of the rotating arm and the housing assembly, and the locking piece cooperates with the locking mating portion to lock or unlock the rotating arm.

In some embodiments of the present invention, the locking member includes a lock catch, which is arranged on the rotating arm, and the locking mating portion includes a locking block, which is arranged on a side of the housing assembly close to the lock catch, and the lock catch can be rotatably engaged with the locking block.

In some embodiments of the present invention, the lock includes a connecting portion and a locking portion, the connecting portion is connected to the rotating arm, the locking portion is arranged at the bottom of the connecting portion, the locking block is provided with a slot, and the locking portion is snapped into the slot.

In some embodiments of the present invention, the rotating arm assembly further includes a second elastic member, which is disposed on a rotatable side close to the rotating arm, and the rotating arm moves axially under the elastic action of the second elastic member.

In some embodiments of the utility model, the rotating arm assembly also includes a connecting assembly, which includes a rotating shaft and a connecting sleeve, the connecting sleeve is arranged on the outside of the rotating arm, the second elastic member is arranged between the rotating arm and the connecting sleeve, and the connecting sleeve is rotatably connected to the housing assembly through the rotating shaft.

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

In some embodiments of the present invention, the connecting assembly includes a rotating shaft, a mounting groove is arranged along the axial direction of the rotating arm close to the rotatable side of the rotating arm, and a through groove is arranged at the mounting groove perpendicular to the axial direction of the mounting groove, the second elastic member is arranged in the mounting groove, the rotating shaft is arranged in the through groove along the axial direction perpendicular to the mounting groove, the rotating arm is rotatably connected to the casing assembly via the rotating shaft, and the through groove can move axially along the mounting groove relative to the rotating shaft.

In some embodiments of the utility model, the dynamic pressure assembly includes a first rod body and a first pressure plate, and 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, and the first elastic member is arranged 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, and the second pressure plate is arranged on the upper part of the first pressure plate, and the first pressure plate is used to abut 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 an electric tool, comprising a housing assembly and any one of the quick-change devices described above.

BRIEF DESCRIPTION OF THE DRAWINGS

By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limiting of the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

FIG1 schematically shows a schematic structural diagram of an electric tool according to an embodiment of the utility model;

FIG2 schematically shows a schematic structural diagram of a rotating arm according to a first embodiment of the present utility model;

FIG3 schematically shows a cross-sectional view of the rotating arm in the first working state according to the first embodiment of the present invention;

FIG4 schematically shows a partial cross-sectional view of the rotating arm in the first working state according to the first embodiment of the present invention;

FIG5 schematically shows a cross-sectional view of the rotating arm in the second working state according to the first embodiment of the present invention;

FIG6 schematically shows a partial cross-sectional view of the rotating arm in the second working state according to the first embodiment of the present invention;

FIG7 schematically shows a schematic structural diagram of a rotating arm according to a second embodiment of the present utility model;

FIG8 schematically shows a partial cross-sectional view of the rotating arm in the first working state according to the second embodiment of the present utility model;

FIG9 schematically shows a partial cross-sectional view of the rotating arm according to the second embodiment of the present invention in the second working state.

The reference numerals are as follows:

1. Housing assembly; 10. Head housing; 100. Mounting sleeve; 11. Housing;

20. first elastic member; 21. first rod body; 22. first pressure plate; 23. second pressure plate;

30. Work attachments;

40, rotating arm; 400, rotating arm body; 401, notch; 402, force-applying portion; 403, mounting groove; 404, through groove; 41, second elastic member;

50, lock buckle; 500, connecting portion; 501, locking portion; 51, locking block;

60. Connecting sleeve; 61. Rotating shaft;

70. Fork assembly; 71. Eccentric shaft.

DETAILED DESCRIPTION

The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

It should be understood that the terms used in the text are only for the purpose of describing specific example embodiments, and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used in the text may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and/or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and/or combinations thereof. The method steps, processes, and operations described in the text are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

As shown in Figures 1 to 9, according to an embodiment of the utility model, a quick-change device is proposed, which is installed on a casing assembly 1. The quick-change device includes a clamping assembly and a rotating arm assembly. The clamping assembly is arranged 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 to abut with the static pressure assembly under the elastic action of the first elastic member 20 to clamp the working accessory 30. The rotating arm assembly is rotatably arranged on the casing assembly 1. The rotating arm assembly includes a rotating arm 40. The rotating arm 40 has a notch portion 401 and a force-applying portion 402. The rotating arm 40 has a first working state in which the top of the dynamic pressure assembly is placed in the notch portion 401, and a second working state in which the force-applying portion 402 applies a force to the dynamic pressure assembly. In the second working state, the dynamic pressure assembly moves away from the static pressure assembly to release the working accessory 30.

The housing assembly 1 includes a head housing 10, and a mounting cavity is formed inside the head housing 10 for mounting a clamping assembly. One end of the rotating arm assembly is rotatably connected to the head housing 10. The principle of the clamping assembly is to drive the movable dynamic pressure assembly to press on the static pressure assembly through the first elastic member 20 to clamp the working attachment 30. Both the dynamic pressure assembly and the static pressure assembly are provided with a clamping plane capable of clamping the working attachment 30, and the movement direction of the dynamic pressure assembly is perpendicular to the clamping plane. The first elastic member 20 can be a spring structure, and the first elastic member 20 is arranged along the movement direction of the dynamic pressure assembly. The function of the first elastic member 20 is to reset the dynamic pressure assembly after moving axially. The principle of the quick-change device is to press the rotating arm 40 so that the rotating arm 40 moves axially along the rotating arm 40 under the elastic force of the second elastic member 41, and the contact position between the bottom of the rotating arm 40 and the dynamic pressure assembly can be adjusted so that the bottom of the rotating arm 40 contacts the top of the dynamic pressure assembly, and the dynamic pressure assembly is moved downward by pressing the rotating arm 40 downward, thereby separating the dynamic pressure assembly from the static pressure assembly, and then releasing the working accessory 30 to facilitate replacement of the working accessory 30.

The quick-change device of the utility model is provided with a clamping assembly. When the clamping assembly is working, the first elastic member 20 drives the movable dynamic pressure assembly to press on the static pressure assembly to clamp the working accessory 30. The clamping assembly abuts the dynamic pressure assembly with the static pressure assembly through the first elastic member 20, and the working accessory 30 (cutting sheet, grinding sheet, etc.) is clamped between the dynamic pressure assembly and the static pressure assembly, so that the working assembly can be fixed. When replacing the working accessory 30, by pressing the rotating arm 40, the rotating arm 40 can be moved along its axial direction, and then the relative position of the notch 401 and the force-applying part 402 of the rotating arm 40 and the dynamic pressure assembly can be adjusted. When the force-applying part 402 applies a force to the top of the dynamic pressure assembly, the dynamic pressure assembly is forced to move downward, so that the dynamic pressure assembly is separated from the static pressure assembly, so that the working accessory 30 can be replaced. The working accessory 30 can be quickly replaced with one hand, which improves the convenience of replacing accessories. After the replacement is completed, the relative position of the rotating arm 40 and the dynamic pressure assembly is adjusted axially so that the top of the dynamic pressure assembly is placed in the notch 401, and the rotating arm 40 is restored to the first working state. At this time, under the action of the elastic force of the first elastic member 20, the dynamic pressure assembly abuts against the static pressure assembly to fix the working accessory 30.

In some embodiments of the utility model, the dynamic pressure assembly includes a first rod body 21 and a first pressure plate 22, the static pressure assembly includes a second pressure plate 23, the first rod body 21 is inserted into the housing assembly 1, the first elastic member 20 is sleeved on the first rod body 21, and the first elastic member 20 is arranged between the housing assembly 1 and one end of the first rod body 21, the first pressure plate 22 is sleeved on the other end of the first rod body 21, and the second pressure plate 23 is arranged on the upper part of the first pressure plate 22, and the first pressure plate 22 is used to abut against the second pressure plate 23 under the elastic action of the first elastic member 20 to clamp the working accessory 30. Specifically, the first rod body 21 is a cylindrical rod structure, the first pressure plate 22 is a disc-shaped structure, a mounting sleeve 100 is arranged inside the head shell 10, a mounting cavity is formed inside the mounting sleeve 100, a step structure is formed inside the mounting cavity, the inner diameter of the step structure decreases from top to bottom, the first rod body 21 is inserted into the mounting cavity and moves along the axial direction of the mounting cavity, the first elastic member 20 is sleeved outside the first rod body 21, and one end of the first elastic member 20 abuts against the above-mentioned step structure, and the other end of the first elastic member 20 abuts against one end of the first rod body 21, a first through hole is arranged at the center of the first pressure plate 22, the first pressure plate 22 is sleeved on the bottom of the first rod body 21 through the first through hole, and can be connected by interference to strengthen fixation, and can also be fixed by clamping or bolts. Similarly, the second pressure plate 23 is also a disc-shaped structure, and the second pressure plate 23 can be sleeved outside the mounting sleeve 100 by interference connection, clamping or bolt connection. The side of the second pressure plate 23 facing the first pressure plate 22 and the side of the first pressure plate 22 facing the second pressure plate 23 may be provided with a protrusion or a matching hole for mounting the working accessory 30, for example, cooperating with the positioning hole on the working accessory 30 for fixing, so that the working accessory 30 is firmly mounted. When the rotating arm 40 applies pressure to the top of the first rod body 21, the first rod body 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 thereto to move downward, so that the first pressure plate 22 is separated from the second pressure plate 23, so that the working accessory 30 can be replaced easily. A shift fork assembly 70 is also sleeved on the mounting sleeve 100, one end of the shift fork assembly 70 is connected to the eccentric shaft 71, one end of the eccentric shaft 71 is connected to the shift fork assembly 70, and the other end of the eccentric shaft 71 is connected to the output end of the power source. When the output end of the power source rotates, the eccentric shaft 71 is driven to run along a preset circular trajectory, so that the shift fork assembly 70 also follows the eccentric shaft 71 to move along the preset circular trajectory. Since one end of the shift fork assembly 70 is rotatably sleeved on the mounting sleeve 100, the mounting sleeve 100 is driven by the shift fork assembly 70 to rotate clockwise by a certain angle and then counterclockwise by a certain angle, thereby driving the working accessory 30 fixed to the clamping assembly to rotate clockwise by a certain angle and then counterclockwise by a certain angle, thereby realizing sawing, grinding and other operations.

In some embodiments of the utility model, the quick-change device further includes a locking structure, which includes a locking member and a locking fitting portion. The locking member is disposed on one of the rotating arm 40 and the housing assembly 1, and the locking fitting portion is disposed on the other of the rotating arm 40 and the housing assembly 1. The locking member cooperates with the locking fitting portion to lock or unlock the rotating arm 40. The rotating arm 40 is locked by connecting the locking member with the locking fitting portion, so that the rotating arm 40 is in a locked state. At this time, the dynamic pressure assembly presses the static pressure assembly under the action of the first elastic member 20, so that the working accessory 30 placed between the dynamic pressure assembly and the static pressure assembly is pressed and fixed. When the locking member is separated from the locking fitting portion, the rotating arm 40 is in an unlocked state. At this time, the dynamic pressure assembly is separated from the static pressure assembly, which facilitates the replacement of the working accessory 30.

In some embodiments of the utility model, the locking member includes a lock buckle 50, which is arranged on the rotating arm 40, and the locking mating part includes a locking block 51, which is arranged on a side of the housing assembly 1 close to the lock buckle 50, and the lock buckle 50 can be rotatably engaged with the locking block 51. In this embodiment, the lock buckle 50 is arranged in the middle of the rotating arm 40 or on the side away from the rotating connection between the rotating arm 40 and the head shell 10. The lock buckle 50 includes a connecting part 500 and a locking part 501. The connecting part 500 is connected to the rotating arm 40, and the locking part 501 is arranged at the bottom of the connecting part 500. The locking part 501 and the connecting part 500 are cylindrical structures. The cross-sectional area of the locking part 501 is larger than the cross-sectional area of the connecting part 500. The locking block 51 is arranged on the head shell 10 and is arranged corresponding to the lock buckle 50. The locking block 51 has a slot at one end facing the rotating shaft 61. The cross-sectional area of the slot is larger than the cross-sectional area of the connecting part 500 and smaller than the cross-sectional area of the locking part 501, so as to prevent the locking part 501 from escaping from the slot, thereby ensuring the stability and reliability of the locking structure. By pressing the rotating arm 40, the lock buckle 50 is inserted into or out of the locking block 51 through the slot. When the rotating arm 40 is pressed to insert the lock buckle 50 into the locking block 51 through the notch, please refer to FIG. 2, FIG. 2 shows the lock buckle 50 cooperating with the locking block 51, so that the rotating arm 40 is in a locked state, so that the first pressure plate 22 and the second pressure plate 23 press the working accessory 30. When the rotating arm 40 is pressed to make the lock buckle 50 escape from the locking block 51 through the notch, as shown in FIG. 4, FIG. 4 shows that the lock buckle 50 and the locking block 51 are unlocked, so that the rotating arm 40 is in an unlocked state. At this time, the rotating arm 40 moves upward through the rotating shaft 61, and at the same time, the rotating arm 40 moves to the side away from the second elastic member 41 under the action of the second elastic member 41, so that the bottom of the rotating arm 40 contacts the top of the first rod body 21, and then the rotating arm 40 is pressed downward to drive the first rod body 21 to move downward, so that the dynamic pressure assembly is separated from the static pressure assembly, so as to replace the working accessory 30.

In some embodiments of the utility model, the rotating arm assembly further includes a second elastic member 41, which is arranged on a rotatable side close to the rotating arm 40, and the rotating arm 40 moves axially under the elastic action of the second elastic member 41. Specifically, the rotating arm 40 includes a rotating arm body 400, and the rotating arm body 400 is provided with a second elastic member 41 near its rotating end, and the second elastic member 41 can be a spring structure, and the rotating arm body 400 can move axially under the action of the second elastic member 41. When the rotating arm body 400 compresses the second elastic member 41 to move along the rotatable side close to the rotating arm 40, so that the top of the first rod body 21 is placed in the notch 401, the rotating arm 40 is in the first working state, and the first pressure plate 22 abuts against the second pressure plate 23 to press the working attachment 30. When the rotating arm body 400 moves along the rotatable side away from the rotating arm 40 under the elastic force of the second elastic member 41, when the force-applying part 402 applies force to the top of the first rod body 21, 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 accessory 30 can be replaced.

In some embodiments of the utility model, the rotating arm assembly further includes a connecting assembly, which includes a connecting sleeve 60 and a rotating shaft 61. The connecting sleeve 60 is sleeved on the outside of the rotating arm 40, and the second elastic member 41 is arranged between the rotating arm 40 and the connecting sleeve 60. The connecting sleeve 60 is connected to the housing assembly 1 through the rotating shaft 61. Specifically, as shown in Figures 2 to 6, the connecting sleeve 60 is sleeved on the outside of the rotating arm body 400, and an axial hole is arranged at the end of the connecting sleeve 60. The rotating shaft 61 is arranged in the axial hole. The connecting sleeve 60 is hinged with the head shell 10 through the rotating shaft 61 to realize rotation. One end of the rotating arm body away from the rotating shaft 61 is used for the user to pull, and the other end of the rotating arm body is in contact with the second elastic member 41. The second elastic member 41 can be a spring structure. The second elastic member 41 is arranged along the axial direction of the connecting sleeve 60. 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 member 41. An opening is provided at the bottom of the connecting sleeve 60, and the opening is provided corresponding to the first rod body 21, that is, the opening is provided at a relatively upper position of the first rod body 21 along the height direction. When the working accessory 30 needs to be replaced, the user presses the rotating arm 40 to make the rotating arm 40 move in a direction away from the second elastic member 41 under the elastic force of the second elastic member 41, and at the same time lifts the rotating arm 40 upward to make the lock buckle 50 disengage from the locking block 51. When the rotating arm 40 moves to the position where the notch 401 is offset from the opening, the rotating arm 40 is pressed downward to make the top of the first rod body 21 contact with the bottom of the rotating arm 40, and then continue to press the rotating arm 40 downward to make the rotating arm 40 drive the dynamic pressure assembly to move downward, thereby separating the first pressure plate 22 from the second pressure plate 23, so that the working accessory 30 can be disassembled and replaced. After the accessory is replaced, the rotating arm 40 is pressed to compress the second spring, and the rotating arm 40 is pressed downward at the same time, and the lock buckle 50 is extended into the locking block 51 to lock it, so that the first pressure plate 22 and the second pressure plate 23 press the working accessory 30 tightly.

In other embodiments, the rotating arm assembly may only have a connecting sleeve 60 without a second elastic member 41. By using external force to make the rotating arm body 400 and the connecting sleeve 60 slide relative to or away from each other, the position of the notch 401 and the top of the first rod body 21 can be adjusted.

In some embodiments of the utility model, the connection assembly includes a rotating shaft 61, a mounting groove 403 is provided along the axial direction of the rotating arm 40 near the rotatable side of the rotating arm 40, and a through groove 404 is provided at the mounting groove 403 perpendicular to the axial direction of the mounting groove 403, the second elastic member 41 is provided in the mounting groove 403, the rotating shaft 61 is provided in the through groove 404 along the axial direction perpendicular to the 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 move axially along the mounting groove 403 relative to the rotating shaft 61. Specifically, as shown in Figures 7 to 9, the rotating arm body 400 compresses the second elastic member 41, and the through groove 404 moves relative to the rotating shaft 61 toward the end away from the second elastic member 41, so that the top of the first rod body 21 is placed in the notch 401, and the rotating arm 40 is in the first working state at this time, and the first pressure plate 22 abuts against the second pressure plate 23 to press the working attachment 30. When the rotating arm body 400 moves along the rotatable side away from the rotating arm 40 under the elastic force of the second elastic member 41, the through groove 404 moves relative to the rotating shaft 61 toward the end close to the second elastic member 41, so that the force-applying part 402 applies a force to the top of the first rod body 21, and the dynamic pressure component moves downward under the force, so that the dynamic pressure component is separated from the static pressure component, and the working accessory 30 can be replaced.

The second aspect of the utility model proposes an electric tool, including a housing assembly 1 and the above-mentioned quick-change device. The housing assembly 1 also includes a shell 11, and the shell 11 includes a structure of two half shells connected to form a complete shell. The two half shells can be snap-fitted or fixed by screws. The interior of the shell 11 forms a mounting cavity for mounting various components of the 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 for easy use. The electric tool proposed in the second aspect of the utility model has the same beneficial effects as the quick-change device proposed in the first aspect of the utility model, which will not be repeated here. In addition, the top of the housing assembly 1 has a through slot that can accommodate the rotating arm 40. The length of the through slot is greater than the length of the rotating arm 40, so as to facilitate pressing the rotating arm 40. The rotating arm 40 can be placed in the through slot when locked, so that the rotating arm assembly can be completely accommodated in the housing assembly 1, ensuring beauty without affecting use.

The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims (10)

1. A quick-change device, mounted on a housing assembly, comprising: A clamping assembly, arranged at one end of the housing assembly, the clamping assembly comprising a first elastic member, a static pressure assembly and a dynamic pressure assembly, the dynamic pressure assembly being used to abut against the static pressure assembly under the elastic action of the first elastic member to clamp the working accessory; A rotating arm assembly is rotatably arranged on the housing assembly, and the rotating arm assembly includes a rotating arm, the rotating arm having a notch portion and a force-applying portion, the rotating arm having a first working state in which the top of the dynamic pressure assembly is placed in the notch portion, and a second working state in which the force-applying portion applies a force to the dynamic pressure assembly, in which the dynamic pressure assembly moves in a direction away from the static pressure assembly to release the working accessory. 2. The quick-change device according to claim 1 is characterized in that the quick-change device also includes a locking structure, the locking structure includes a locking piece and a locking matching portion, the locking piece is arranged on one of the rotating arm and the housing assembly, the locking matching portion is arranged on the other of the rotating arm and the housing assembly, the locking piece cooperates with the locking matching portion to lock or unlock the rotating arm. 3. The quick-change device according to claim 2 is characterized in that the locking member includes a lock buckle, which is arranged on the rotating arm, and the locking matching part includes a locking block, which is arranged on a side of the housing assembly close to the lock buckle, and the lock buckle can be rotatably engaged with the locking block. 4. The quick-change device according to claim 3 is characterized in that the lock includes a connecting part and a locking part, the connecting part is connected to the rotating arm, the locking part is arranged at the bottom of the connecting part, the locking block is provided with a slot, and the locking part is engaged in the slot. 5. The quick-change device according to claim 1 is characterized in that the rotating arm assembly further comprises a second elastic member, the second elastic member is arranged on a rotatable side close to the rotating arm, and the rotating arm moves axially under the elastic action of the second elastic member. 6. The quick-change device according to claim 5 is characterized in that the rotating arm assembly also includes a connecting assembly, the connecting assembly includes a rotating shaft and a connecting sleeve, the connecting sleeve is arranged on the outside of the rotating arm, the second elastic member is arranged between the rotating arm and the connecting sleeve, and the connecting sleeve is rotatably connected to the housing assembly through the rotating shaft. 7. The quick-change device according to claim 6 is characterized in that an opening is provided at the bottom of the connecting sleeve, and the opening is provided corresponding to the dynamic pressure component. In the first working state, the top of the dynamic pressure component extends into the notch through the opening. 8. The quick-change device according to claim 6 is characterized in that the connecting assembly includes a rotating shaft, a mounting groove is provided along the axial direction of the rotating arm close to the rotatable side of the rotating arm, and a through groove is provided at the mounting groove perpendicular to the axial direction of the mounting groove, the second elastic member is provided in the mounting groove, the rotating shaft is provided in the through groove along the axial direction perpendicular to the mounting groove, the rotating arm is rotatably connected to the housing assembly via the rotating shaft, and the through groove can move axially along the mounting groove relative to the rotating shaft. 9. The quick-change device according to any one of claims 1 to 8 is characterized in that 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, and the first elastic member is arranged 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 arranged on the upper part of the first pressure plate, and the first pressure plate is used to abut against the second pressure plate under the elastic action of the first elastic member to clamp the working accessory. 10. An electric tool, comprising a housing assembly and the quick-change device according to any one of claims 1 to 9.