POWER TOOL

A power tool includes a chuck device for clamping a working component. The chuck device includes a locking mechanism, an operation member, a connection shaft, a driving assembly, and a stopper member. The locking mechanism implements a locking function. The operation member is operable to allow the locking mechanism to leave a locking position and is detachably connected to the connection shaft. The driving assembly drives the locking mechanism to be in the locking position. The stopper member is configured to limit the driving assembly.

RELATED APPLICATION INFORMATION

This application claims the benefit under 35 U.S.C. § 119(a) of Chinese Patent Application No. CN 202121696379.6, filed on Jul. 23, 2021, Chinese Patent Application No. CN 202110836458.0, filed on Jul. 23, 2021, and Chinese Patent Application No. CN 202121696269.X, filed on Jul. 23, 2021, which applications are incorporated herein by reference in their entirety.

BACKGROUND

A handheld power tool is typically fitted with various types of replaceable working heads. Since the working heads need to be disassembled and replaced frequently, the tool is usually provided with a chuck for clamping a detachable working head. The working head can be clamped to or detached from a traditional chuck of the power tool only with an auxiliary tool and thus be replaced.

To replace the working head with greater convenience and simplify clamping and unlocking operations, there has been a power tool in the related art, which has a chuck convenient for a user to operate with a single hand. However, the chuck for quick clamping in the related art has the problems of a complicated manufacturing process and a high maintenance cost.

SUMMARY

A power tool includes a housing, an output device capable of driving a working component, and a chuck device for clamping the working component. The chuck device includes a locking mechanism having a locking position in which the working component is locked. The chuck device further includes an operation member, a connection shaft, a driving assembly, and a stopper member. The operation member is operable to allow the locking mechanism to leave the locking position. The connection shaft is used for connecting the output device to the operation member, where the operation member is detachably connected to the connection shaft. The driving assembly is disposed inside the operation member, moves along a first direction with respect to the connection shaft, and is capable of driving the locking mechanism to be in the locking position. The stopper member is connected to the operation member and configured to limit the driving assembly and prevent the driving assembly from moving out from inside the operation member along the first direction.

In some examples, the driving assembly includes a biasing element and a pushing member, where the pushing member abuts against the locking mechanism, and the biasing element is capable of providing a biasing force for maintaining the locking mechanism in the locking position and pushing the locking mechanism to be in the locking position.

In some examples, the locking mechanism is disposed inside the operation member and mounted to the operation member along a third direction.

In some examples, the operation member includes a through hole for the locking mechanism to pass through.

In some examples, the locking mechanism is sphere.

In some examples, the chuck device further includes a blocking element. The blocking element is disposed at an end of the operation member, where a distance exists between the blocking element and an end surface of the operation member, and when the locking mechanism are disengaged from the locking position the blocking element limits a distance by which the operation member moves to disengage the locking mechanism from the locking position.

In some examples, the chuck device further includes a limiting member, where the limiting member includes a first limiting portion and a second limiting portion, the second limiting portion abuts against the locking mechanism when the locking mechanism is in the locking position, and the first limiting portion allows the locking mechanism to leave the locking position when the locking mechanism is disengaged from the locking position.

In some examples, the limiting member further includes an incline which connects the first limiting portion to the second limiting portion.

In some examples, the limiting member prevents the locking mechanism from moving out from inside the operation member along the third direction.

In some examples, the connection shaft forms a connection cavity where the working component is mounted, where the connection cavity extends along an axial direction of the connection shaft.

In some examples, the connection shaft forms a mounting hole communicating with the connection cavity, and the locking mechanism is configured to partially pass through the mounting hole and is movable along a second direction with respect to the mounting hole.

In some examples, the mounting hole extends along the first direction and the locking mechanism slides in the mounting hole along the first direction.

In some examples, a gap exists between the operation member and the connection shaft, and the driving assembly is disposed in the gap.

In some examples, the height of the gap is less than the diameter of each of the locking mechanism.

In some examples, the working component includes recess portion, where the locking mechanism is partially inserted into the recess portion when the working component is mounted to the chuck device.

A power tool includes a housing, an output device capable of driving a working component, and a chuck device for clamping the working component. The chuck device includes a locking mechanism having a locking position in which the working component is locked. The chuck device further includes an operation member and a connection shaft. The operation member is operable to allow the locking mechanism to leave the locking position. The connection shaft is used for connecting the output device to the operation member, where the operation member is detachably connected to the connection shaft.

A power tool includes a housing, an output device capable of driving a working component, and a chuck device for clamping the working component. The chuck device includes a locking mechanism having a locking position in which the working component is locked. The chuck device further includes an operation member, a connection shaft, a driving assembly, and a stopper member. The operation member is operable to allow the locking mechanism to leave the locking position. The connection shaft is used for connecting the output device to the operation member, where the locking mechanism connects the connection shaft to the operation member. The driving assembly is disposed inside the operation member and used for driving the locking mechanism to be in the locking position. The stopper member is detachably connected to the operation member and configured to limit the driving assembly and prevent the driving assembly from moving out from inside the operation member.

In some examples, the stopper member is a C-ring connected to the inner wall of the operation member.

In some examples, the stopper member moves synchronously with the operation member with respect to the connection shaft.

In some examples, a blocking element mounted at an end of the connection shaft is further included, where the blocking element is detachably connected to the connection shaft, a distance exists between the blocking element and an end surface of the operation member, and the blocking element limits a moving distance of the stopper member.

DETAILED DESCRIPTION

The present application is described below in detail in conjunction with drawings and examples.

FIG.1is a schematic view of a power tool in the present application. The power tool is a handheld power tool. The handheld power tool100is a rotary impact tool, such as an impact screwdriver or an impact wrench.

Referring toFIGS.1and2, the handheld power tool100includes a housing110, a motor, an output device170, and a transmission assembly. The output device170is used for outputting a driving force. The motor is disposed inside the housing110, and the output device170is disposed at a front end of the housing110. A working component200is a working head which can implement a different function, such as a screwdriver, a drill bit, and a wrench.

The motor has a motor shaft which provides rotary output. The motor includes a stator and a rotor, where the rotor can rotate about a first axis. The transmission assembly is connected to the motor and the output device170and configured to transmit the output of the motor to the output device170. Specifically, the transmission assembly decelerates the rotary output of the motor shaft to perform rotary output. Optionally, the output device170includes an impact force generation mechanism for generating an impact force. A circuit board is electrically connected to the motor and configured to control the motor to output the driving force. The circuit board is accommodated in the housing110.

An accommodating cavity is formed through the encirclement by the housing110. At least part of the motor and part of the transmission assembly are accommodated in the accommodating cavity. In this example, both the motor and the transmission assembly are accommodated in the accommodating cavity formed by the housing110and disposed along an axial direction of the motor shaft of the motor. The transmission assembly is connected to the motor and disposed in the front of the housing110with respect to the motor. The motor and the transmission assembly rotate coaxially and may also rotate non-coaxially of course. The handheld power tool100further includes a grip and a power supply connection portion, where the grip is formed by the housing110for a user to grip, and the power supply connection portion is connected to a power supply for supplying power to the motor.

The handheld power tool100further includes the power supply for supplying electrical energy to the handheld power tool100. Optionally, the handheld power tool100is powered by a direct current power supply. In this example, the handheld power tool100is powered by a battery pack which supplies power to the motor and circuit components on the circuit board in cooperation with a corresponding power supply circuit. It is to be understood by those skilled in the art that the power supply is not limited to the battery pack, and circuit elements may also be powered through mains or an alternating current power supply in cooperation with the corresponding rectifier circuit, filter circuit, and voltage regulation circuit.

Referring toFIGS.2to5, the handheld power tool100further includes a chuck device120for clamping and fixing the working component200. The chuck device120includes a connection shaft121and a locking mechanism123. The connection shaft121is connected to the output device170and forms a connection cavity122where the working component200is mounted. In this example, the connection cavity122extends along a first direction101which coincides with or is parallel to an axial direction of the output device170.

The working component200includes recess portion210. The locking mechanism123is partially inserted into the recess portion210when the working component200is mounted to the chuck device120.

The locking mechanism123is at least partially disposed in the connection shaft121and has a locking position in which the working component200is locked. The working component200is inserted into the connection cavity122along the first direction101and then clamped and fixed by the chuck device120.

The chuck device120further includes an operation member128, a driving assembly12a, and a stopper member180. The operation member128is operable to allow the locking mechanism123to leave the locking position. The driving assembly12ais disposed inside the operation member, moves along the first direction101with respect to the connection shaft121, and can push the locking mechanism123to be in the locking position. The driving assembly12aincludes a biasing element125and a pushing member160, where the pushing member160is disposed between the operation member128and the biasing element125and abuts against the locking mechanism123, and the pushing member160pushes the locking mechanism123to be in the locking position. The biasing element125can provide a biasing force for maintaining the locking mechanism123in the locking position and pushing the locking mechanism123to be in the locking position. The biasing element125and the pushing member160are disposed inside the operation member, the biasing element125connects the pushing member160to the operation member125, and the pushing member160pushes the locking mechanism123to be in the locking position.

The connection shaft121is disposed in front of the housing. When the locking mechanism123is in the locking position, the biasing element125pushes the pushing member160forward and pushes the operation member128backward. The biasing element125implements the biasing of the pushing member160and the limitation of the operation member128, which can reduce not only a cost but also the size of the chuck device120.

Referring toFIGS.3to5, the connection shaft121is formed with a mounting hole124communicating with the connection cavity122, and the locking mechanism123is configured to partially pass through the mounting hole124and is movable along a second direction102with respect to the mounting hole124. The mounting hole124communicates with the connection cavity122, and the working component200can be placed into the connection cavity122. The locking mechanism123passing through the mounting hole124can partially abut against the working component200and lock the working component200through the biasing force provided by the biasing element125.

In this example, the mounting hole124extends along the first direction101, and the locking mechanism123slides along the first direction101while moving along the second direction102.

The chuck device120further includes a limiting member140which encircles a mounting cavity for limiting the locking mechanism123, and the mounting hole124is at least partially exposed to an inside of the mounting cavity130. The limiting member140includes a first limiting portion141and a second limiting portion142. When the locking mechanism123is in the locking position, the second limiting portion142abuts against the locking mechanism123. When the locking mechanism123is disengaged from the locking position, the first limiting portion141abuts against the locking mechanism123. In a direction perpendicular to the first direction101, the first limiting portion141is away from the locking mechanism123with respect to the second limiting portion142. In this example, the locking mechanism123includes a plurality of spheres. In order that the locking mechanism123can slide smoothly from the position where the locking mechanism123abuts against the second limiting portion142to the position where the locking mechanism123abuts against the first limiting portion141, an incline143is disposed between the first limiting portion141and the second limiting portion142.

When the first limiting portion141abuts against the locking mechanism123, the locking mechanism123is disengaged from the locking position. Since the first limiting portion141is away from the locking mechanism123with respect to the second limiting portion142, the locking mechanism123may move along the first direction101with respect to the connection shaft121, thereby releasing the working component200from the limitation by the locking mechanism123. When the second limiting portion142abuts against the locking mechanism123, the locking mechanism123is in the locking position and engaged with the recess portion210, the position of the locking mechanism123is limited by the limiting member140, and the working component200is connected by the locking mechanism123. Two or more locking mechanisms123may be provided to enhance the stability of clamping the working component200.

Referring toFIGS.3to5,FIG.3is a structural view of the chuck assembly when the working component is locked to the power tool in the first example, where locking mechanism is in the locking position;FIG.4is a structural view of the chuck assembly when the working component is detached from the power tool in the first example, where the locking mechanism is disengaged from the locking position, that is, the locking mechanism is in the release position; andFIG.5is a structural view of the chuck assembly of the power tool in the first example during its manufacturing and assembly, where the working component is not mounted to the power tool. The working component200can be connected to the front of the housing. The biasing element125maintains the locking mechanism123in the locking position when the working component200is not mounted. When the user inserts the working component200into the connection cavity122, the working component200presses the locking mechanism123and thus the locking mechanism123pushes the pushing member160and compresses the biasing element125backward so that the locking mechanism123enters the release position. The locking mechanism123can move along the second direction102so that the working component200can be completely inserted into the connection cavity122. After the working component200is completely inserted into the connection cavity122, the recess portion210is aligned with the locking mechanism123, and the pushing member160pushes the locking mechanism123so that the locking mechanism123is in the locking position. At this time, the locking mechanism123is partially placed into the recess portion210so that the locking mechanism123can partially abut against the working component200and lock the working component200through the biasing force provided by the biasing element125. When the working component200is removed, the operation member128can be operated to move forward with respect to the connection shaft121, the driving assembly12aand the limiting member140both move forward, and the first limiting portion141is aligned with the locking mechanism123. When the working component200is pulled forward, the working component200presses the locking mechanism123to move along the second direction, and the locking mechanism123abuts against the second limiting portion141so that the locking mechanism123enters the release position. The locking mechanism123can move along the second direction102so that the working component200can be completely disengaged from the connection cavity122.

The stopper member180is connected to the operation member128. In this example, the stopper member180is a C-shaped circlip detachably connected to an inner sidewall of the operation member128. The stopper member180is disposed along the first direction101on a side of the direction in which the driving assembly12amoves out of the operation member120. In this example, the stopper member180is disposed in front of the pushing member160along the first direction101. More specifically, the stopper member180is disposed at a front end of the operation member to prevent the driving assembly12afrom moving out from inside the operation member128along the first direction101. The stopper member180is provided so that the pushing member160and the biasing element125are confined in a gap150between the operation member128and the connection shaft121. When the operation member128needs to be detached, the stopper member180is detached from the operation member128, and then the limiting member140and the locking mechanism123are detached successively so that both the driving assembly12aand the operation member128can be detached from the connection shaft121. Thus, the operation member is detachably connected to the connection shaft to facilitate the maintenance of the chuck device. The connection shaft and the operation member can be detached and specific damaged parts can be replaced without replacing the entire chuck device, thereby reducing a maintenance cost.

The gap150exists between the operation member128and the connection shaft121, and the limiting member140, the pushing member160, and the biasing element125are disposed in the gap150.

Referring toFIGS.5and6, the operation member128includes a through hole1281for the locking mechanism123to pass through. The locking mechanism123is mounted to the operation member along a third direction103, where the third direction103is perpendicular to or intersects with the first direction101. When the chuck device120is assembled, the spherical locking mechanism123is placed into the gap150of the chuck device120via the through hole1281. A fitting220is inserted into the gap150to abut against the biasing element and prevent the biasing element from pushing out the locking mechanism123. The fitting220is pulled out and other elements such as the stopper member180are mounted. Here, the fitting220is configured to assist in the assembly of the chuck device120. The through hole1281is provided to prevent the locking mechanism123from being placed into the gap150from an end of the gap150so that a height of the gap150may be less than a diameter of the locking mechanism123, so as to reduce the size of the chuck device120.

The limiting member140prevents the locking mechanism123from moving out from inside the operation member128along the third direction103.

As an alternative example, a rubber ring surrounds the operation member128to cover the through hole1281, the rubber ring may screen the through hole1281to a certain extent and serve as a decoration for beauty. When the user operates the operation member128, the rubber ring makes the operation member128comfortable to grip.

In addition, it has been found that when the chuck device120is unlocked using the operation member128, the user occasionally applies such an excessive force that the operation member128compresses the biasing element125excessively. Thus, a small-diameter position of the operation member128abuts against the locking mechanism123, which makes the locking mechanism fail to be disengaged from the locking position and causes the chuck device120to be stuck. Referring toFIG.9, the working component cannot be effectively separated. Therefore, a blocking element190disposed at an end of the connection shaft121is further added, where a distance exists between the blocking element190and an end surface of the operation member128. The blocking element190is disposed at an end of the operation member128, and the distance exists between the blocking element190and the end surface of the operation member128. The connection shaft121is disposed in front of the housing. When the locking mechanism is in the locking position, the biasing element125pushes the pushing member160forward and pushes the operation member128backward. When the locking mechanism is disengaged from the locking position, the operation member128moves forward with respect to the connection shaft121, and the blocking element190provided can prevent the operation member128from moving forward excessively and avoid the situation where the locking mechanism and the operation member128are stuck since a rear portion of the operation member128abuts against the locking mechanism. Thus, the distance between the blocking element and the end surface of the operation member128is a distance by which the operation member128can move when operated. The limiting member and the operation member128can be regarded as being fixedly connected to each other. The distance is provided between the blocking element and the end surface of the operation member128, and thus a certain distance also exists between the limiting member and the blocking element.

Optionally, the blocking element190is a C-ring disposed at the end of the connection shaft121, and the C-ring may be press-fitted onto the connection shaft121to facilitate assembly.

In this regard, a method for mounting the chuck device120is provided below. A. The operation member128is sleeved on the connection shaft121. B. The driving assembly12ais placed inside the operation member128. C. Referring toFIGS.5and6, the fitting220is placed between the operation member128and the connection shaft121to compress the biasing element125. When the biasing element125is compressed, the locking mechanism123is placed between the operation member128and the connection shaft121via the through hole1281on the operation member128, and then the fitting is taken out. The biasing element125and the pushing member160spring back and abut against the locking mechanism to prevent the locking mechanism from moving out of the mounting hole. D. The limiting member140is placed into the operation member128, the driving assembly12ais limited by the stopper member180on the inner wall of the operation member128, and the blocking element190is mounted at the end of the connection shaft121, where the distance exists between the blocking element190and the end surface of the operation member128.

Optionally, step C further includes attracting the locking mechanism using a magnetic device so as to compress the biasing element125. In this case, the locking mechanism is made of a magnetically attractable material.

In a second example, referring toFIGS.10to16, a handheld power tool100aincludes a chuck assembly120afor clamping and fixing a working component200. Referring toFIGS.10and11, the chuck assembly120aincludes a connection shaft121aand locking mechanism123a. The connection shaft121ais connected to an output device170and forms a connection cavity122awhere the working component200is mounted. The locking mechanism123ais disposed in the connection shaft121aand have a locking position in which the working component200is locked. The working component200is inserted into the connection cavity122aand then clamped and fixed by the chuck assembly120a.

Referring toFIGS.11to13, the chuck assembly120afurther includes a mounting hole124aformed on the connection shaft121a. The locking mechanism123ais configured to partially pass through the mounting hole124aand is movable along a second direction102awith respect to the mounting hole124a. The chuck assembly120afurther includes a biasing element125awhich can provide a biasing force for maintaining the locking mechanism123ain locking position. The mounting hole124acommunicates with the connection cavity122a, and the working component200can be placed into the connection cavity122a. The locking mechanism123apassing through the mounting hole124acan partially abut against the working component200and lock the working component200through the biasing force provided by the biasing element125a.

The chuck assembly120aincludes an operation member128asleeved on the connection shaft121a. The operation member128acan drive the biasing element125ato release the clamping of the working component200through its movement. The operation member128aincludes a limiting portion129awhich surrounds a mounting cavity130afor limiting the locking mechanism123a, and the mounting cavity130ais formed between the connection shaft121aand the limiting portion129a. The mounting hole124ais exposed to an inside of the mounting cavity130aand connect the mounting cavity130ato the connection cavity122a. The locking device123apasses through the mounting hole124a, and the locking device123aincludes a portion exposed to the mounting cavity130aand a portion which can be exposed to the connection cavity122a. In this example, a middle portion of the locking device123apasses through the mounting hole124a, and two ends of the locking device123amay be in the mounting cavity130aand the connecting cavity122a, separately.

Referring toFIG.13, the limiting portion129aincludes a first contact surface1291aand a second contact surface1292a. Optionally, the limiting portion129afurther includes an incline1293awhich connects the first contact surface1291ato the second contact surface1292a. In the second direction102a, the first contact surface1291ais away from the locking device123awith respect to the second contact surface1292a. The operation member128acan be operated to move along a first direction101awith respect to the connection shaft121a. The operation member128adrives the limiting portion129ato move along the first direction101a, thereby changing a contact surface of the limiting portion129aaligned with the locking device123a. Thus, a projection of the first contact surface1291a, the second contact surface1292a, or the incline1293aand a projection of the locking device123ain a radial direction of the first direction101apartially overlap each other. The incline1293ais used for transition between the first contact surface1291aand the second contact surface1292aso that the locking device123acan slide smoothly from a state of being in contact with the first contact surface1291ato a state of being in contact with the second contact surface1292a.

Referring toFIGS.15and16, the locking device123aincludes a stopper member126aand a body portion127a, where a diameter D1 of the stopper member126ain a radial direction of the second direction102ais greater than a diameter D2 of the body portion127ain the radial direction of the second direction102a. The body portion127aincludes a first body1271aand a second body1272a, where the first body1271ais mainly in the mounting hole124aand connects the stopper member126ato the second body1272a, and the second body1272ais the portion of the locking device123aexposed to the connection cavity122aand can abut against the working component200placed into the connection cavity122ato limit the working component200. The stopper member126ais in the mounting cavity130aand can abut against the first contact surface1291a, the second contact surface1292a, and the incline1293aof the limiting portion129a. The diameter of the stopper member126ain the radial direction of the second direction102ais greater than a diameter of the mounting hole124ain the radial direction of the second direction102a. Thus, the stopper member126awill not pass through the mounting hole124a, so as to prevent the locking device123afrom moving out of the mounting hole124atoward the connection cavity122a. In addition, the limiting portion129alimits the locking device123ato prevent the locking device123afrom moving out of the mounting hole124atoward the mounting cavity130a.

The working component200includes recess portion210. The locking mechanism123ais partially inserted into the recess portion210when the working component200is mounted to the chuck assembly120a. When the locking device123ais aligned with the first contact surface1291a, the locking device123ais in a release position. Since the first contact surface1291ais away from the locking device123awith respect to the second contact surface1292a, the locking device123acan move along the second direction102awith respect to the connection shaft121a, thereby releasing the working component200from the limitation by the locking device123a. When the locking device123ais aligned with the second contact surface1292a, the locking device123ais in the locking position, the stopper member126aabuts against the second contact surface1292a, and the second body1272ais engaged with the recess portion210. The position of the locking device123ais limited by the limiting portion129a, and the working component200is connected by the locking device123a. Two or more locking mechanisms123amay be provided to enhance the stability of clamping the working component200.

Referring toFIGS.11,13, and14,FIG.11is a structural view of the chuck assembly when the working component is not mounted to the power tool in the second example;FIG.13is a structural view of the chuck assembly when the working component is locked to the power tool in the second example, where the locking mechanism is in the locking position; andFIG.14is a sectional view of the chuck assembly when the working component is unlocked from the power tool in the second example, where the locking mechanism is in the release position. The working component200can be connected to the front of the housing, and the operation member128acan be operated to move forward with respect to the connection shaft121aso that the locking device123ais disengaged from the locking position and moves to the release position. The biasing element125aconnects the operation member128ato the connection shaft121a. The biasing element125ais disposed in a gap150abetween the operation member128aand the connection shaft121a. The biasing element125abiases the operation member128aso that the second contact surface1292ais aligned with the locking device123a. Thus, the locking device123ais maintained in the locking position through the biasing force provided by the biasing element125a. The user may push the operation member128aforward such that the operation member128acompresses the biasing element125a, so as to change the contact surface aligned with the locking device123a. When the working component200is not mounted, the biasing element125amaintains the locking device123ain the locking position. The user inserts the working component200into the connection cavity122a, and the working component200presses the locking device123a. Thus, the locking device123apushes the operation member128aand compresses the biasing element125aforward so that the locking device123aenters the release position. The locking device123acan move along the second direction102aso that the working component200can be completely inserted into the connection cavity122a. After the working component200is completely inserted into the connection cavity122a, the locking device123ais partially placed into the recess portion210so that the locking device123ano longer pushes the operation member128a. The operation member128areturns to an original position under the action of the biasing element125aso that the locking device123ais in the locking position. In this case, the locking device123ais partially placed into the recess portion210and limited by the operation member128aso that the chuck assembly120acan connect the working component200.

Optionally, the body portion127ais a cylinder and mates with the stopper member so that the diameter of the mounting hole124acan be unchanged, which can simplify a manufacturing process and reduce a manufacturing cost.

An upper surface of the stopper member126ais an arcuate curved surface so that a center of the upper surface of the stopper member126ais higher than other positions in the second direction102a. The arcuate curved surface can mate with the first contact surface1291a, the second contact surface1292a, and the incline1293aso that the stopper member126acan smoothly slide along the first contact surface1291a, the second contact surface1292a, and the incline1293a, thereby improving the user's feeling.

Referring toFIG.14, the chuck assembly120afurther includes an elastic member1201aand a pushing block1202a. The pushing block1202acan abut against the working component200. When the locking device123aleaves the locking position, the elastic member1201apushes the pushing block1202aso that the working component200is ejected with respect to the connection cavity122a. Thus, when the user needs to release the limitation to the working component200, the user only needs to push the operation member128asuch that the locking mechanism returns to the release position, the elastic member1201aacts on the pushing block1202a, and the pushing block1202ais automatically pushed to eject the working component200. Thus, when the user needs to mount and connect the working component200, the user only needs to push the working component200into the connection cavity122a, which can be completed with a single hand, thereby facilitating the user's operation. When the user needs to detach the working component200, the user only needs to push the operation member128asuch that the locking mechanism123areturn to the release position, which can also be completed with a single hand, thereby facilitating the user's operation. The connection shaft121ais hollow, and the elastic member1201aand the pushing block1202aare disposed in the connection shaft121a, thereby reducing the volume of a quick clamping device.

In the preceding example, the limiting portion129ais formed on the operation member128a, that is, the operation member128aand the limiting portion129aare integrally formed. Optionally, the chuck assembly120aincludes the operation member128aand the limiting portion129awhich are connected to each other. The operation member128ais sleeved on the connection shaft121a, the limiting portion129aincludes a top block which can push the locking device123ainto the locking position, and the biasing element125aconnects the top block and the operation member128a.