Power tool

Abstract

The application discloses an electric tool, which comprises a motor, a driving shaft connected with or formed on a rotor of the motor, the driving shaft rotating around a first axis, an output shaft connected with a tool head, the output shaft being formed on or connected with the driving shaft, and a shaft locking assembly, which comprises locking parts formed on or connected with the driving shaft or the output shaft and an execution part selectively engaging with at least one of the locking parts, wherein when the motor is stopped, the at least one locking part is stopped at a position capable of being engaged with the execution part. The electric tool is simple in operation and high in safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric power tools. BACKGROUND

[0002] In the prior art, when replacing the working element such as a saw blade or a grinding blade, the output shaft needs to be limited so as to be unable to rotate, and then the saw blade can be replaced. In the related art, the output shaft is limited in rotation by using a shaft lock mechanism. In use, the output shaft or the shaft lock mechanism needs to be adjusted to a specified or specific position after the motor is stopped, and then the locking function of the shaft lock mechanism is started. SUMMARY

[0003] To solve the problems in the prior art, the present application aims to provide an electric power tool without the need for manual alignment of the shaft lock and the output shaft.

[0004] To achieve the above object, the present application adopts the following technical solution:

[0005] An electric power tool comprises: a housing provided with a receiving space; a motor comprising a stator and a rotor, the rotor being connected or formed with a driving shaft for outputting power; the driving shaft rotates about a first axis; a power output assembly comprising an output shaft for connecting a tool head, the output shaft being formed or connected to the driving shaft; further comprising: a shaft lock assembly comprising: a locking portion formed or connected to the driving shaft or the output shaft; an execution portion selectively engaging at least one locking portion; wherein, when the motor is stopped, the at least one locking portion stops at an engagement position capable of being engaged with the execution portion.

[0006] In some embodiments, the stator comprises: a stator core and a stator winding, the stator core being provided with N recesses, the rotor comprising: a permanent magnet for generating a magnetic field, the number of magnetic poles of the stator being M, the number of locking portions being C in the plurality of locking portions, the locking portions being uniformly arranged around the driving shaft, wherein C is the least common multiple of N and M.

[0007] In some embodiments, the total number of locking portions is greater than or equal to C.

[0008] In some embodiments, when the motor is stopped, any point on the outer wall of the driving shaft has C fixed stop positions, and the locking portions are correspondingly arranged with the stop positions.

[0009] In some embodiments, the shaft lock assembly further comprises: a first shaft lock member and a second shaft lock member, the first shaft lock member comprising: a shaft lock disc formed or connected to the driving shaft, the locking portions being arranged on the shaft lock disc, the locking portions being recesses extending in the radial direction of the driving shaft towards the first axis, the second shaft lock member comprising a shaft lock rod, the execution portion being formed or connected to the shaft lock rod.

[0010] In some embodiments, the execution portion is disengaged from the locking portion when the execution portion moves to the second position, so that the shaft lock assembly is in the second state.

[0011] In some embodiments, the power tool further comprises a first operation assembly disposed at least partially outside the housing, the first operation assembly driving the shaft lock assembly to switch between the first state and the second state, and a first locking assembly limiting the shaft lock assembly in the first state when the first operation assembly drives the shaft lock assembly to the first state, and allowing the shaft lock assembly to switch from the first state to the second state when the first operation assembly is triggered again.

[0012] In some embodiments, the first locking assembly comprises a first locking member disposed on the first operation assembly and a second locking member disposed on the housing and engaged with the first locking member, the second locking member limiting the movement of the first locking member when the first operation assembly drives the shaft lock assembly to the first state.

[0013] In some embodiments, the power tool further comprises a main switch for controlling the start and stop of the motor, and a stall protection system for disconnecting the power supply of the motor when the main switch starts the motor and the shaft lock assembly is in the first state.

[0014] A power tool comprising: a housing provided with a receiving space; a motor comprising a driving shaft rotating about a first axis; a power output assembly comprising an output shaft for connecting a tool head, the output shaft being formed or connected to the driving shaft; a base slidingly sleeved outside the housing for supporting the power tool on a workpiece surface; a shaft lock assembly comprising a first state of limiting the rotation of the output shaft and a second state of releasing the rotation of the output shaft; the shaft lock assembly comprising: a locking portion formed or connected to the driving shaft or the output shaft; an execution portion moving substantially in the direction of the first axis and selectively engaging at least one locking portion; the execution portion engaging with the at least one locking portion when the shaft lock assembly is in the first state; and a first locking assembly limiting the shaft lock assembly in the first state when the shaft lock assembly is in the first state, and allowing the shaft lock assembly to switch from the first state to the second state when the first locking assembly is triggered again.

[0015] The power tool of the present application, when replacing the saw blade, sets the engagement position of the execution portion engaging with the at least one locking portion inside the at least one locking portion after the motor stops, so that the output shaft or the shaft lock does not need to be adjusted after the motor stops. Further, the locking portion does not need to be adjusted, and the execution portion can engage with the locking portion after moving to the engagement position. The shaft lock is automatically aligned. The user does not need to manually adjust to the specified position to align the two, the operation is simple, and the safety is high. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural diagram of an embodiment of the present application;

[0017] Figure 2 is a sectional view of 1;

[0018] Figure 3 is Figure 1 a structural diagram of part components in the host in 1, showing the motor, the first locking mechanism, the output shaft;

[0019] Figure 4 is Figure 3 a sectional view of A-A in 1;

[0020] Figure 5 is Figure 3 a sectional view of B-B in 1;

[0021] Figure 6 is Figure 3 a structural diagram of part components in another perspective in 1, showing the first locking assembly;

[0022] Figure 7 is Figure 3 a structural diagram of part components in another perspective in 1, wherein the shaft lock assembly is in the second state;

[0023] Figure 8 is Figure 3 a structural diagram of part components in another perspective in 1, wherein the shaft lock assembly is in the first state. DETAILED DESCRIPTION

[0024] The present application will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0027] For the sake of clarity of the technical solutions of the present application, the following terms are defined as follows Figure 1 The upper side, lower side, front side and rear side are shown in the drawings.

[0028] The electric power tool of the first embodiment of the present application is shown in the drawings, which is a router 100. It can be understood that in other alternative embodiments, the electric power tool can also be an edge trimmer, a router, or other handheld electric power tools suitable for one-handed operation. In other alternative embodiments, the electric power tool can also be a drill, a screwdriver, or an electric power tool such as an angle grinder or an angle drill. Figure 1 The electric power tool of the first embodiment of the present application is shown in the drawings, which is a router 100. It can be understood that in other alternative embodiments, the electric power tool can also be an edge trimmer, a router, or other handheld electric power tools suitable for one-handed operation. In other alternative embodiments, the electric power tool can also be a drill, a screwdriver, or an electric power tool such as an angle grinder or an angle drill.

[0029] The electric power tool of the first embodiment of the present application is shown in the drawings, which is a router 100. It can be understood that in other alternative embodiments, the electric power tool can also be an edge trimmer, a router, or other handheld electric power tools suitable for one-handed operation. In other alternative embodiments, the electric power tool can also be a drill, a screwdriver, or an electric power tool such as an angle grinder or an angle drill. Figures 1 to 2 The router 100 of the first embodiment of the present application includes a power supply device 30 and a main machine 1. The power supply device 30 is used to provide power for the main machine 1. In this embodiment, the power supply device 30 is a battery pack, which cooperates with a corresponding power supply circuit to supply power to the corresponding components in the main machine 1. It should be understood by those skilled in the art that the power supply device 30 is not limited to the scenario of using a battery pack, but can also be powered by mains or alternating current power, cooperating with a corresponding rectification, filtering and voltage regulation circuit to supply power to the corresponding components in the machine.

[0030] The electric power tool of the first embodiment of the present application is shown in the drawings, which is a router 100. It can be understood that in other alternative embodiments, the electric power tool can also be an edge trimmer, a router, or other handheld electric power tools suitable for one-handed operation. In other alternative embodiments, the electric power tool can also be a drill, a screwdriver, or an electric power tool such as an angle grinder or an angle drill. Figures 1 to 2 As shown in the drawings, the main machine 1 includes a motor 11, a housing 12, a power output assembly 13, a base 14 and a control system. The motor 11 forms or is connected with a drive shaft 111 for outputting power. The drive shaft 111 extends along a first axis 101 and rotates relative to the housing 12 about the first axis 101 as the rotation axis. In this embodiment, the drive shaft 111 is formed on the rotor 117 of the motor, and in other embodiments, the drive shaft 111 can also be another rotation shaft in transmission connection with the rotor 117 of the motor.

[0031] The control system includes a switch and a controller. The switch includes a main switch 15 for controlling the start and stop of the motor 11 and an operating member 16 for operating to trigger the main switch 15.

[0032] The electric power tool of the first embodiment of the present application is shown in the drawings, which is a router 100. It can be understood that in other alternative embodiments, the electric power tool can also be an edge trimmer, a router, or other handheld electric power tools suitable for one-handed operation. In other alternative embodiments, the electric power tool can also be a drill, a screwdriver, or an electric power tool such as an angle grinder or an angle drill. Figures 1 to 2As shown, in this embodiment, the first axis 101 is vertical, meaning the motor 11 is arranged vertically in the vertical direction. The motor rotor 117 is located near the upper part, and the power output end of the drive shaft 111 is located near the lower part. The power output assembly 13 is formed or connected to the lower end of the drive shaft 111. In other alternative embodiments, the first axis can be horizontal, meaning the motor 11 is arranged horizontally, such as in drills or screwdrivers. The power output assembly 13 is used to connect a tool head (not shown in the figure) to perform the operation on the workpiece, such as a milling head or saw blade. In this embodiment, the power output assembly 13 includes an output shaft 131 for connecting the tool head. The output shaft 131 is connected to or formed at the lower end of the drive shaft 111. The output shaft rotates about the output axis. The tool head is detachably fixed to the output shaft 131. A fan 112 is provided above the power output assembly 13, and the fan 112 is driven by the motor 11. In this embodiment, the output axis coincides with the first axis 101. In some embodiments, the output axis is parallel to but does not coincide with the first axis 101. In some embodiments, the output axis intersects or is orthogonal to the first axis 101, such as in corner tools like angle drills and angle grinders. It is understood that the positional and connection relationships between the drive shaft and the output shaft do not affect the substantive content of this application. The drive shaft and the output shaft can be directly driven together, or they can be connected by a transmission mechanism, a reversing mechanism, or an impact mechanism.

[0033] The outer casing 12 extends substantially along the first axis 101. In this embodiment, the outer casing 12 is divided into a power connection portion 121, a connection portion 122, and a main body portion 123 from top to bottom. The power connection portion 121 is used to connect to the power supply device 30. In this embodiment, the power supply device 30 is a battery pack; in the following description, the term "battery pack 30" will be used instead of "power supply device 30," but this should not be construed as a limitation of the present invention.

[0034] The base 14 is slidably sleeved on the outside of the main body 123, and the base 14 is used to support the bakelite milling machine 100 on the surface of the workpiece to be operated. In this embodiment, the base 14 includes a sleeve 141 and a base plate 142 that match the shape of the main body 123. The sleeve 141 covers the outside of the main body 123, and the base plate 142 is connected to the lower end of the sleeve 141. The sleeve 141 has a grip portion for the user to hold, and the vertical dimension of the grip portion is not less than the width of an adult's palm.

[0035] like Figures 3 to 8As shown, the host 1 also includes a first locking mechanism 21, comprising a shaft lock assembly 211. The shaft lock assembly 211 includes a first state that restricts the rotation of the output shaft 131 and a second state that releases the rotation of the output shaft 131. In this embodiment, the output shaft 131 is formed on the drive shaft 111. It can be understood that the shaft lock assembly 211 can also directly enter the first and second states by restricting the rotation of the drive shaft 111 about the first axis 101 and releasing the rotation of the drive shaft 111 about the first axis 101.

[0036] The first locking mechanism 21 further includes a first operating component 212 and a first locking component 213. The first operating component 212 is at least partially disposed outside the housing 12 for user operation, allowing the shaft lock component 211 to switch between a first state and a second state. In this embodiment, the first operating component 212 includes a first pushing part 2121. The first pushing part 2121 extends partially outside the housing 12 and is slidably connected to the housing. The user directly pushes the first pushing part 2121 to switch the shaft lock component 211 to the first or second state. It is understood that the first pushing part can also be switched mechanically by rotation, pressing, or flicking. The first locking component 213 locks the shaft lock component 211 when the first operating component 212 is triggered to put the shaft lock component 211 into the first state, and allows the shaft lock component 211 to switch from the first state to the second state when the first operating component 212 is triggered again. This eliminates the need for the user to constantly operate the first operating component of the first locking mechanism when disassembling the tool head, improving the user experience of the power tool. Changing tool heads by using both hands simultaneously makes the operation safer.

[0037] The shaft locking assembly 211 includes a first shaft locking member 211a and a second shaft locking member 211b. In this embodiment, the first shaft locking member 211a includes a shaft locking disc 2111, which is formed or connected to the drive shaft 111. The shaft locking disc 2111 and the drive shaft 111 form an integral unit and rotate about a first axis 101. A locking portion 2112 is provided on the outer peripheral surface of the shaft locking disc 2111. The second shaft locking member 211b includes a shaft locking rod 2113, and an actuating portion 2114 is formed or connected to the shaft locking rod 2113. The actuating portion 2114 can selectively engage at least one locking portion 2112. When the actuating portion 2114 engages with at least one locking portion 2112, the shaft locking assembly 211 is in a first state. The shaft locking rod 2113 is driven by an operating component. Specifically, one end of the shaft locking rod 2113 is connected to the first pushing part 2121, and the other end of the shaft locking rod 2113 is provided with an actuating part 2114. In this embodiment, the actuating part 2114 is formed on the shaft locking rod 2113. In other alternative embodiments, the actuating part 2114 is connected to the shaft locking rod 2113. The actuating part 2114 and the shaft locking rod 2113 are not limited to being coaxial. The actuating part 2114 and the shaft locking rod 2113 can be L-shaped, T-shaped, or Y-shaped, etc., according to actual position requirements.

[0038] The first locking assembly 213 includes a first locking member 213a disposed on the first pushing part 2121 and a second locking member 213b disposed on the housing 12. When the shaft locking assembly 211 is in the first state, the first locking member 213a and the second locking member 213b are locked to each other, so that when the user removes the force applied to the first pushing part 2121, the first pushing part 2121 remains in the position when the shaft locking assembly 211 is in the first state, that is, the actuating part 2114 remains engaged with at least one locking part 2112.

[0039] In this embodiment, the first pushing part 2121 is inserted into the sliding groove 214 of the outer casing 12, and slides along a direction parallel to the first axis 101. A first locking member 213a is disposed on both sides of the first pushing part 2121, and includes a first latch 2131 and an elastic part 2132. A second locking member 213b is disposed within the sliding groove 214, and includes a second latch 2133. The second latch 2133 and the first latch 2131 are engaged with each other. When the first latch 2131 interferes with the second latch 2133 via the elastic part 2132, the first latch 2131 compresses the elastic part 2132 and moves away from the second latch 2133. After the first latch 2131 passes the second latch 2133, the elastic part 2132 resets, and the first latch 2131 and the second latch 2133 engage or disengage.

[0040] The motor includes a stall protection system. When the main switch starts the motor, if the shaft lock assembly 211 is still in the first state, the stall protection system de-energizes the motor. That is, when the actuator 2114 is still engaged with at least one locking part 2112, restricting the rotation of the drive shaft 111, if the main switch is triggered, causing the battery pack to supply power to the motor and start the motor to rotate the drive shaft 111, the stall protection system activates, disconnecting the battery pack's power supply to the motor. The motor will not start, and the drive shaft 111 will not start, thus protecting the motor from damage.

[0041] The stall protection system includes a detection mechanism and a first control mechanism. The detection mechanism is used to detect the state of the shaft lock assembly 211. The first control mechanism is mounted on a circuit board; in this embodiment, the first control mechanism is an MCU (Microcontroller Unit). The first control mechanism determines whether to disconnect the power supply to the motor based on the state of the shaft lock assembly 211 detected by the detection mechanism.

[0042] The stall protection system also includes an alarm mechanism, which is at least partially located on the exterior of the housing, to alert the user that the stall protection system has been activated. The alarm mechanism includes, but is not limited to, a buzzer alarm, a warning light, or other human-machine interface displays.

[0043] In this embodiment, multiple locking parts 2112 are disposed on the shaft lock disc 2111. In other alternative embodiments, the multiple locking parts 2112 can be directly disposed on the drive shaft 111. When the actuator 2114 moves to the engagement position, the actuator 2114 engages with at least one locking part 2112 to put the shaft lock assembly 211 in a first state. When the motor switches to stop, at least one locking part 2112 is in the engagement position. This ensures that the actuator 2114 can be aligned with the locking part 2112 each time the motor stops. This allows the shaft lock assembly 211 to smoothly enter the first state. It is understood that when the motor stops, the actuator 2114 is driven only by the first operating component 212. Since at least one locking part 2112 is in the engagement position, there is no need to adjust the locking part 2112. The actuator 2114 can engage the locking part 2112 after moving to the engagement position.

[0044] Understandably, the actuator 2114 can be aligned with the locking part 2112. In this embodiment, the actuator 2114 moves substantially in a direction parallel to the first axis 101, and the locking part 2112 can be aligned with the actuator 2114, that is, the locking part 2112 is aligned with the actuator 2114 in the direction of the first axis 101. It should be explained that in actual adjustment, due to tolerances or manufacturing errors, and the degree of measurement-related errors, the direction of the actuator and the first axis will not be perfectly parallel. Therefore, parallel or substantially parallel here should be considered as a range defined by the absolute values ​​of the two endpoints. Parallel or substantially parallel setting can refer to the actuator's direction of movement being parallel to the direction of the first axis plus or minus a certain percentage (e.g., 1%, 5%, 10% or more).

[0045] In other alternative implementations, when the actuator 2114 moves in other ways or in other directions, that is, when the actuator 2114 engages or disengages from the locking part 2112, the locking part 2112 is located in the movement path of the actuator 2114.

[0046] In this embodiment, the stator 116 includes a stator core 116a and a stator winding 116b. The stator core 116a has N grooves 116c, meaning N is the number of slots in the motor. The rotor 117 includes a permanent magnet 117a for generating a magnetic field, and the stator 116 has M magnetic poles, meaning M is the number of poles in the motor. As is known in related art, a permanent magnet motor without power supply generates periodic torque, i.e., cogging torque, due to the tendency of its rotor 117 and stator 116 to self-adjust to the position of minimum magnetic reluctance. Cogging torque is the tangential component of the force between the magnetic field of the permanent magnet 117a and the slots. The cogging torque always attempts to position the rotor 117 at a certain location. Utilizing the characteristics of the motor's cogging torque, the stopping position of the motor rotor 117 is fixed. In other words, the number of stopping positions at any point on the outer wall of the motor shaft corresponds to the number of cogging torques per revolution of the rotor 117. The number of stopping positions is no more than the number of cogging torques per revolution of the rotor 117. Therefore, when the grooves 116c of the stator core 116a and the permanent magnets 117a of the rotor 117 are both uniformly arranged around the first axis 101, the stopping positions are also uniformly arranged around the first axis 101. Therefore, by establishing a correspondence between the number of locking parts 2112 and the number of cogging torques per revolution of the rotor 117, it can be achieved that each time the motor stops, the actuator 2114 can be aligned with at least one of the multiple locking parts 2112.

[0047] According to relevant technologies, the number of cogging torques per revolution of rotor 117 is the least common multiple of the number of poles M and the number of slots N. Let C be the least common multiple of the number of poles M and the number of slots N. Therefore, C locking parts 2112 are evenly arranged around the drive shaft 111. The total number of locking parts 2112 is greater than or equal to C. In this embodiment, motor 12 is a four-pole, six-slot internal rotor brushless motor, meaning N is six and M is four. Therefore, twelve locking parts 2112 are evenly arranged around the outer surface of the drive shaft 111. If the total number of locking parts 2112 is greater than 12, the remaining locking parts 2112 are respectively arranged between the twelve locking parts 2112. That is, the twelve locking parts 2112 are evenly isolated from each other, and the remaining locking parts 2112 are placed between the twelve locking parts 2112 as needed.

[0048] In this embodiment, the plurality of locking portions 2112 are plurality of grooves extending radially toward the first axis 101. The stopping position is located within the grooves. That is, the engagement position of the actuator 2114 is within the groove. The stopping position coincides with the midpoint of the groove.

[0049] To ensure smoother engagement between the actuator 2114 and the locking part 2112, at least one of the second shaft locking member 211b or the first shaft locking member 211a is provided with a guide part 2115, which guides the actuator 2114 to engage with the locking part 2112. In this embodiment, a guide surface is provided at one end of the shaft locking rod 2113 that is embedded in the groove, for guiding the shaft locking rod 2113 into the groove.

[0050] When the tool head needs to be changed, the user slides the first pusher on the housing 12, and the shaft locking rod 2113 engages in the groove along the first axis 101 parallel to the motor shaft. This restricts the rotation of the shaft locking disc 2111 around the first axis 101, thereby locking the rotation of the drive shaft 111 around the first axis 101, and the shaft locking assembly 211 is in the first state. When the user pushes the first pusher 2121 back, the shaft locking rod 2113 disengages from one of the grooves, and the rotation of the shaft locking disc 2111 and the drive shaft 111 around the first axis 101 is released, and the shaft locking assembly 211 is in the second state.

[0051] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this application.

Claims

1. An electric tool, comprising: The outer casing has a storage space. An electric motor, comprising a stator and a rotor, wherein the rotor is connected to or formed with a drive shaft for outputting power; The drive shaft rotates about the first axis. An output shaft for connecting a tool head; the output shaft is formed or connected to the drive shaft; Its characteristic is that it further includes: A shaft locking assembly includes a first state that restricts the rotation of the output shaft and a second state that releases the rotation of the output shaft. The shaft lock assembly includes: A locking part is formed or connected to the drive shaft or the output shaft; The actuator may selectively engage at least one of the locking parts; When the motor stops, at least one of the locking parts stops in an engagement position that can engage with the actuator. The power tool also includes: A first operating component, at least partially disposed outside the housing, drives the shaft lock assembly to switch between a first state and a second state. A first locking component restricts the shaft locking component to the first state when the first operation component drives it to be in the first state, and allows the shaft locking component to switch from the first state to the second state when the first operation component is triggered again. The first locking component includes: a first locking member disposed on the first operating component and a second locking member disposed on the housing and engaging with the first locking member. When the first operating component drives the shaft locking component to a first state, the second locking member restricts the movement of the first locking member.

2. The power tool according to claim 1, characterized in that, The stator includes a stator core and stator windings, wherein the stator core has N grooves. The rotor includes a permanent magnet for generating a magnetic field, and the stator has M magnetic field poles. The plurality of locking parts includes a number of C locking parts, which are evenly arranged around the drive shaft, wherein C is the least common multiple of N and M.

3. The power tool according to claim 2, characterized in that, The total number of locking parts is greater than or equal to C.

4. The power tool according to claim 2, characterized in that, When the motor stops, any point on the outer wall of the drive shaft has C fixed stopping positions, and the locking part is set corresponding to the stopping positions.

5. The power tool according to claim 1, characterized in that, The shaft lock assembly further includes: a first shaft lock member and a second shaft lock member. The first shaft lock member includes: a shaft lock disc formed or connected to the drive shaft. The locking portion is disposed on the shaft lock disc and is a groove extending radially toward the first axis along the drive shaft. The second shaft lock member includes a shaft lock rod, and the actuating portion is formed or connected to the shaft lock rod.

6. The power tool according to claim 1, characterized in that, When the actuator moves to the second position, the actuator disengages from the locking part, so that the shaft locking assembly is in the second state.

7. The power tool according to claim 1, characterized in that, The power tool also includes a main switch for controlling the start and stop of the motor. The stall protection system disconnects the power supply to the motor when the main switch starts the motor and the shaft lock assembly is in the first state.

8. An electric tool, comprising: The outer casing has a storage space. An electric motor, including a drive shaft that rotates about a first axis; The output shaft is used to connect the tool head; The output shaft is formed or connected to the drive shaft; Its characteristic is that it further includes: The base is slidably fitted onto the outside of the housing and is used to support the power tool on the workpiece surface; A shaft locking assembly includes a first state that restricts rotation of the output shaft and a second state that releases rotation of the output shaft; the shaft locking assembly includes: A locking part is formed or connected to the drive shaft or the output shaft; The actuator moves substantially along the direction of the first axis and can selectively engage at least one of the locking parts; when the shaft locking assembly is in the first state, the actuator engages with at least one of the locking parts; A first operating component, at least partially disposed outside the housing, drives the shaft locking component to switch between a first state and a second state; a first locking component, when the shaft locking component is in the first state, restricts the shaft locking component to the first state, and allows the shaft locking component to switch from the first state to the second state when the first locking component is triggered again. The first locking component includes: a first locking member disposed on the first operating component and a second locking member disposed on the housing and engaging with the first locking member. When the first operating component drives the shaft locking component to a first state, the second locking member restricts the movement of the first locking member.

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