Power tool

Abstract

This utility model relates to the field of power tool technology, and particularly to power tools such as polishing machines. The power tool of this utility model includes a main unit and a knob assembly rotatably connected to the main unit. The main unit includes a carrier, a drive device, an output end driven by the drive device, and a control component connected to the carrier. The knob assembly can drive at least a portion of the control component to rotate. The carrier is provided with a positioning structure configured to position the control component. This utility model can prevent the control component from excessive rotation.

Description

Technical Field

[0001] This utility model relates to the field of power tool technology, and in particular to power tools such as polishing machines. Background Technology

[0002] Traditional power tools such as polishing machines typically adjust operating parameters like motor speed and start-up via knobs connected to encoders. However, the knobs on these tools can rotate without restriction, potentially causing encoders to over-rotate, making it difficult to accurately determine motor operating parameters, and in extreme cases, even damaging the encoder and motor.

[0003] For power tools such as polishing machines with power interfaces at the ends, making the knob easy to assemble while preventing excessive rotation of encoders is also one of the issues that needs to be addressed. Utility Model Content

[0004] One objective of this invention is to solve or alleviate the aforementioned technical problems.

[0005] The present invention employs an electric tool comprising a main unit and a knob assembly rotatably connected to the main unit. The main unit includes a carrier, a drive device, an output end driven by the drive device, and a control component connected to the carrier. The knob assembly is capable of rotating at least a portion of the control component. The carrier is provided with a positioning structure configured to position the control component.

[0006] The effect achieved by this invention is to prevent the control components from rotating excessively.

[0007] In a further technical solution, the positioning structure is configured to limit the rotation range of the control component.

[0008] In a further technical solution, the positioning structure includes at least a first limiting post and a second limiting post, the first limiting post and the second limiting post being spaced apart, and the control component rotating within the range of the first limiting post and the second limiting post.

[0009] In a further technical solution, the control component is provided with a lever, the knob component can drive the lever to rotate, and the lever and the positioning structure have an overlap in the height direction.

[0010] In a further technical solution, the host also includes an end circuit board; the end circuit board is fixed to the upper part of the positioning structure.

[0011] A further technical solution is that the knob cover is provided with a rotating connection groove, the inner wall of which fits against the main unit, and the knob cover is provided with a lever groove, one end of which is inserted into the lever groove, with the lever groove being set in the height direction.

[0012] This technical solution facilitates the assembly of the knob cover onto the main unit.

[0013] A further technical solution involves providing an anti-detachment protrusion on the knob cover, and the main unit also includes a detachable frame. The detachable frame is fixedly connected to the top of the positioning structure, and the bottom surface of the detachable frame is in contact with or close to the anti-detachment protrusion.

[0014] This technical solution can prevent the knob cover from falling off the main unit.

[0015] A further technical solution involves extending the upper part of the positioning structure outward to form a boss, with the top of the limiting post passing through the end circuit board and being fixedly connected to the detachable frame, so that the detachable frame and the boss clamp the end circuit board.

[0016] A further technical solution includes a gear shift groove in one of the carrier and the knob cover, a retaining member and a gear shift elastic member that abuts against the retaining member and the inner wall of the gear shift groove respectively, and a multiple gear shift slots in the other of the carrier and the knob cover, with the retaining member able to slide along the gear shift groove and having a tendency to approach the gear shift slot.

[0017] This technical solution can generate gear shift feel and enable the control component to output a fixed angle signal.

[0018] In a further technical solution, the host also includes a housing surrounding the carrier and a shell fixedly connected to the carrier, the shell being provided with a light-transmitting part; a side circuit board being provided on the carrier and being directly or indirectly electrically connected to the control components; a light-emitting device being provided on the side circuit board; and the light-transmitting part facing the light-emitting device.

[0019] This technical solution can display the angle of the knob cover, thereby revealing the operating parameters of the drive device.

[0020] A further technical solution also includes a working component; one of the driving end and the working component is provided with a snap-fit ​​liner and a snap-fit ​​component, the snap-fit ​​liner is provided with a snap-fit ​​component groove that penetrates the snap-fit ​​liner; a sleeve is fitted onto the snap-fit ​​liner, the sleeve can move along the snap-fit ​​liner, the inner wall of the sleeve is provided with an unlocking groove, the snap-fit ​​component is disposed in the snap-fit ​​component groove and can slide along the snap-fit ​​component groove; the other of the working component and the driving end is provided with a snap-fit ​​connector, the snap-fit ​​connector has a snap-fit ​​groove; the snap-fit ​​connector is inserted into the snap-fit ​​liner, a part of the snap-fit ​​component is inserted into the snap-fit ​​groove, and the other part is fitted against the inner wall of the sleeve to prevent the snap-fit ​​component from moving out of the snap-fit ​​groove.

[0021] This technical solution allows for the rapid separation and installation of the workpiece from the drive end, facilitating the replacement of workpieces of different specifications.

[0022] A further technical solution involves a snap-fit ​​elastic element between the snap-fit ​​liner and the sleeve. The snap-fit ​​elastic element causes the sleeve to have a tendency to move relative to the snap-fit ​​liner, and the movement tendency is the tendency of the unlocking groove to move away from the snap-fit ​​element.

[0023] This technical solution can ensure the reliability of the connection between the working part and the drive end. Attached Figure Description

[0024] Figure 1 This is a perspective view of an electric tool according to an embodiment of the present invention.

[0025] Figure 2 This is a perspective view of an embodiment of the present invention, showing an electric tool and two working parts 9 (working parts 9 as replacement parts).

[0026] Figure 3 This is a three-dimensional exploded view of the power tools according to an embodiment of the present invention. Figure 1 Workpiece 9 is not drawn.

[0027] Figure 4 This is a three-dimensional schematic diagram of an electric tool according to an embodiment of the present invention. Figure 2 Workpiece 9 is not drawn.

[0028] Figure 5 This is a partial perspective view of an electric tool according to an embodiment of the present invention; the knob assembly 2, the detachable frame 112, the end circuit board 121, and the end cover 149 are not shown.

[0029] Figure 6 This is a three-dimensional schematic diagram of a half-section of the knob cover 21.

[0030] Figure 7 This is a top view of an electric tool according to an embodiment of the present invention; the knob assembly 2, detachable frame 112, end circuit board 121, end cover 149 and working part 9 are not shown.

[0031] Figure 8 This is a schematic diagram of section SEC1.

[0032] Figure 9 This is a schematic diagram of DTL1 in detail one.

[0033] Figure 10 This is a schematic diagram of DTL2 in detail two.

[0034] Figure 11 This is a schematic diagram of section SEC2.

[0035] The accompanying drawings in the specification that best illustrate the technical features of this utility model are: Figure 3 .

[0036] Section 1 (SEC1); Section 2 (SEC2); Detail 1 (DTL1); Detail 2 (DTL2); Main unit 1; Carrier 11; Positioning structure 111; First limiting post 1111; Second limiting post 1112; Detachable frame 112; Power interface 12; End circuit board 121; Control component 13; Lever 131; Limiting post groove 132; Housing 14; Light-transmitting part 141; End cover 149; Side circuit board 15; Light-emitting device 151; Driving device 18; Power supply 181; Speed ​​change device 182; Drive end 19; Knob assembly 2; Knob cover 21; Lever groove 211; Anti-detachment protrusion 213; Rotary connecting groove 219; Gear structure 22; Supporting part 221; Gear elastic part 222; Gear slide 223; Gear groove 224; Decorative part 29; Snap-fit ​​structure 3; Snap-fit ​​liner 31; Snap-fit ​​groove 311; Sleeve 32; Unlock groove 321; Snap-fit ​​part 33; Snap-fit ​​connector 34; Snap-fit ​​groove 341; Snap-fit ​​elastic part 35; Sealing ring 4; Working part 9. Detailed Implementation

[0037] The specific embodiments of this utility model will now be described with reference to the accompanying drawings.

[0038] As a specific embodiment, the power tools of this utility model include, but are not limited to, polishing machines, electric drills, electric saws, angle grinders, sanders, and other electrically driven tools. For ease of understanding, this application will use a polishing machine as an example, which includes a main unit 1 and a knob assembly 2. By rotating the knob assembly 2, the main unit 1 can be controlled, for example, to control the start / stop or working power of the main unit 1.

[0039] The host 1 includes a carrier 11, a drive device 18 mounted on the carrier 11, and a drive end 19 that is rotatable by the drive device 18. It should be noted that the drive device 18 being mounted on the carrier 11 means that the drive device 18 is connected to or in contact with the carrier 11, and this connection or contact can be direct, indirect, or non-direct. The specific structure of the carrier 11 is not limited, as long as it can be directly or indirectly connected to the control component 13 mentioned later. For example, the carrier 11 can be a small component of the host 1 and connected to the control component 13. The carrier 11 can also include a structure such as the outer shell 14 mentioned later.

[0040] As one specific implementation, the host 1 also includes an electrical interface 12 exposed at the end of the carrier 11.

[0041] The power port 12 is an interface for directly or indirectly supplying power to at least one of the drive device 18, the side circuit board 15 (described later), and the power supply 181. For example, the power port 12 may be a TYPE-C interface, which, in conjunction with the existing end circuit board 121, enables the power port 12 to supply power regardless of whether it is connected in either direction to the USB data cable. Of course, the end circuit board 121 may also be provided with circuits for implementing other functions; the power port 12 may also be other existing power supply interfaces.

[0042] The drive device 18 can be a device that outputs rotational power, such as a motor; the drive end 19 can be the rotational output end of the motor or the rotational output end of a speed-changing device 182 driven by the motor. The speed-changing device 182 is a device such as a gearbox that can increase or decrease the input rotational speed. It is understood that the drive device 18 is not limited to providing rotational power; in other embodiments, it can also provide linear reciprocating motion force, such as a linear motor. Correspondingly, the output end 19 can be a rotational motion, or it can be an oscillating or linear reciprocating motion. For example, when a power tool is used as a ratchet wrench, the output end 19 can be an oscillating motion; when used as a reciprocating saw, it can be a linear reciprocating motion. It can be changed according to the structure of the drive device 18, the speed-changing device 182, and the output end 19.

[0043] The carrier 11 is provided with a power supply 181 that is directly or indirectly electrically connected to the drive device 18. The power supply 181 is a secondary battery such as a lithium battery, or a conductive wire that directly supplies power to the drive device 18.

[0044] The main unit 1 also includes a control component 13, which is connected to the carrier 11. The knob component 2 can drive at least part of the control component 13 to rotate, thereby controlling the main unit 1. The control component 13 has the function of controlling the main unit 1, such as controlling the start and stop of the drive device 18 and its rotation speed. It should be noted that the function of the control component 13 in controlling the main unit 1 is not limited. For example, the control component 13 can only control the start and stop of the drive device 18 or only control its rotation speed, or the control component 13 can control the light-emitting state of the light-emitting device 151 described later.

[0045] The control component 13 is equipped with a lever 131, and the knob assembly 2 can drive the lever 131 to rotate, thereby realizing the start and stop of the drive device 18 by rotating the knob assembly 2.

[0046] As one specific implementation, the control component 13 can be an encoder, an on / off switch, or any other rotatable control structure. The control component 13 is an encoder or other device capable of detecting the angle of the lever 131. The control component 13 is electrically connected to the side circuit board 15 (described later), and the power supply 181 is electrically connected to the drive device 18 through the side circuit board 15. This allows the control component 13 to be indirectly electrically connected to the drive device 18, enabling the rotation of the lever 131 to control the rotation speed, start / stop, and other operating parameters of the drive device 18. Alternatively, the control component 13 can be directly electrically connected to the drive device 18.

[0047] The knob assembly 2 includes a knob cover 21 that is rotatably connected to the main unit 1. For example, the knob cover 21 is provided with a rotating connection groove 219, the inner wall of which fits against the main unit 1, so that the knob cover 21 is rotatably connected to the main unit 1.

[0048] The carrier 11 is provided with a positioning structure 111 facing the end of the main unit 1 (i.e., in the height direction). It should be noted that in this embodiment, the overall shape of the power tool is a cylinder, and the height direction is the axial direction of the cylinder. When the power tool has other shapes, the height direction can be understood as the length direction of the rotation axis of the knob assembly 2.

[0049] The positioning structure 111 is configured to position the control assembly 13, that is, to contact the control assembly 13 and prevent the rotating part of the control assembly 13 from rotating. The shape of the positioning structure 111 is not limited, for example, it can be block-shaped, column-shaped or any other arbitrary shape, as long as it can position the control assembly 13.

[0050] The positioning structure 111 is configured to limit the rotation range of the control component 13, that is, the control component 13 can rotate within a predetermined range, but cannot rotate 360° around the rotation axis. Limiting the rotation range of the control component 13 can be achieved by directly limiting the rotation range of the control component 13, or by limiting the rotation range of the knob component 2.

[0051] As one specific implementation, the positioning structure 111 includes a first limiting post 1111 and a second limiting post 1112. The first limiting post 1111 and the second limiting post 1112 are spaced apart. The rotating lever 131 is located between the first limiting post 1111 and the second limiting post 1112. By blocking the rotation of the rotating lever 131, the rotation range of the control component 13 is limited.

[0052] The rotation range of the control component 13 can be determined according to the positions of the first limit post 1111 and the second limit post 1112, for example, it can be 180°, 150° or other angles.

[0053] In other embodiments, the positioning structure 111 can also be other structures, such as being block-shaped with a groove, in which the rotating lever 131 rotates to limit the rotation range of the control component 13. Alternatively, only one limiting post may be used to position the control component 13.

[0054] The knob cover 21 can drive the lever 131 to rotate, and the lever 131 and the positioning structure 111 overlap in the height direction (i.e., towards the end of the main unit 1). In other words, there is a part on the lever 131 that is at the same height as a part of the gear shift structure 22, so that the lever 131 will abut against the positioning structure 111 during rotation and thus limit the rotation angle, preventing the control component 13 from rotating excessively. It is easy to understand that there can be at least one positioning structure 111, or multiple positioning structures 111; when the lever 131 is located between two positioning structures 111, the forward and reverse rotation angles of the lever 131 will be limited. Typically, the knob cover 21 is provided with a decorative piece 29, and several anti-slip countersunk holes are provided on the outer side wall of the knob cover 21. Typically, a sealing ring 4 is provided between the knob cover 21 and the carrier 11, etc., to improve the sealing performance.

[0055] As one specific implementation, the power interface 12 is connected to an end circuit board 121; the end circuit board 121 is fixed on the upper part of the positioning structure 111.

[0056] As one specific implementation, the lever 131 is provided with a limiting groove 132; when the lever 131 is held by the positioning structure 111 and its rotation angle is restricted, the inner wall of the limiting groove 132 fits against the positioning structure 111. This implementation can increase the contact area between the positioning structure 111 and the lever 131, thereby reducing wear between the positioning structure 111 and the lever 131.

[0057] As one specific implementation, the knob cover 21 is provided with a rotating connecting groove 219, the inner wall of which fits against the main unit 1, allowing the knob cover 21 to be rotatably connected to the main unit 1. The knob cover 21 is also provided with a lever groove 211, one end of which is inserted into the lever groove 211, enabling the knob cover 21 to rotate the lever 131. The lever groove 211 is oriented in the height direction. When the main unit 1 is inserted into the rotating connecting groove 219, allowing the knob cover 21 to be rotatably connected to the main unit 1, one end of the lever 131 can also be inserted into the lever groove 211, facilitating the assembly of the knob cover 21 onto the main unit 1.

[0058] As one specific implementation, the knob cover 21 is provided with an anti-detachment protrusion 213, and the main unit 1 also includes a detachable frame 112, which is fixedly connected to the top of the positioning structure 111, for example by screws. The bottom surface of the detachable frame 112 is in contact with or close to the anti-detachment protrusion 213. This implementation can prevent the knob cover 21 from falling off the main unit 1.

[0059] As one specific implementation, the upper part of the positioning structure 111 extends outward to form a boss. The top end of the positioning structure 111 passes through the end circuit board 121 and is fixedly connected to the detachable frame 112, so that the detachable frame 112 and the boss clamp the end circuit board 121, thereby fixing the end circuit board 121 to the upper part of the positioning structure 111. In this implementation, the end circuit board 121 does not require screws or other fasteners for installation, which facilitates the installation of the end circuit board 121. The main unit 1 also includes an end cover 149, which is fixedly connected to the detachable frame 112 by a snap-fit. The power interface 12 is exposed from the end cover 149, and the end cover 149 covers the screws used to fix the end circuit board 121 to the detachable frame 112.

[0060] As one specific implementation method, the power tool of this utility model also has a gear shift structure 22. One of the carrier 11 and the knob cover 21 is provided with a gear shift groove 223. The gear shift groove 223 is provided with a support member 221 and a gear shift elastic member 222 that abuts against the support member 221 and the inner wall of the gear shift groove 223 respectively. The other of the carrier 11 and the knob cover 21 is provided with a plurality of gear shift slots 224. The support member 221 can slide along the gear shift groove 223 and has a tendency to approach the gear shift slots 224. The abutment 221 is spherical, and the shift elastic element 222 is a spring. The abutment 221 is inserted into the shift groove 224 and abuts against the inner wall of the shift groove 224. During the rotation of the knob cover 21, the abutment 221 overcomes the elastic force of the shift elastic element 222 and moves out of one shift groove 224 and into another shift groove 224, which can generate a shift feel and also enable the control component 13 to output a fixed angle signal.

[0061] As one specific implementation, the host 1 is provided with a light-emitting device 151, which is configured to change its light-emitting state as the knob assembly 2 is rotated.

[0062] Users can determine the working status of the driving device 18 by observing the light emission status of the light-emitting device 151, which helps to improve the user experience.

[0063] Optionally, the knob assembly 2 can control the rotation speed of the drive device 18, and the light emission state is the light emission length of the light emission device 151. As the rotation speed of the drive device 18 increases, the light emission length of the light emission device 151 also increases accordingly. In other embodiments, the light emission state can also be the light emission intensity, for example, as the rotation speed of the drive device 18 increases, the light emission intensity of the light emission device 151 increases.

[0064] As one specific embodiment, the host 1 also includes a housing 14 surrounding the carrier 11 and fixedly connected to the carrier 11. The housing 14 is provided with a light-transmitting portion 141. A side circuit board 15, which is directly or indirectly electrically connected to the control component 13, is provided on the carrier 11. A light-emitting device 151 is provided on the side circuit board 15. The light-transmitting portion 141 faces the light-emitting device 151. It is easy to understand that the light-transmitting portion 141 is transparent, allowing light emitted by the light-emitting device 151 to pass through. The light-transmitting portion 141 can be a separate component embedded in other parts of the housing 14, or the light-transmitting portion 141 can be the entire part of the housing 14. The light-emitting device 151 can be a row of multiple LEDs, or it can be a long strip display screen or other device capable of emitting light. As previously described, rotating the knob cover 21 causes the control component 13 to detect the angle of the lever 131 and transmit the electrical signal of the angle to the side circuit board 15. The side circuit board 15 then adjusts the light-emitting device 151 accordingly based on the received electrical signal. For example, when the angle of the lever 131 (relative to a positioning structure 111) is zero degrees, all LEDs in a row of LEDs are turned off, or the entire elongated display screen is turned off. When the angle of the lever 131 is at its maximum value (the lever 131 is restricted from further rotation by another positioning structure 111), all LEDs in a row of LEDs are lit, or the entire elongated display screen is illuminated. As previously described, the lever 131 is associated with the operating parameters of the drive device 18; therefore, this embodiment can display the angle of the knob cover 21, thereby allowing the knowledge of the operating parameters of the drive device 18.

[0065] As one specific implementation, the power tool of this utility model embodiment also includes a working part 9. The working part 9 can be a polishing head for polishing, a cleaning head for cleaning, or other devices for contacting the workpiece to process it. The working part 9 is connected to the drive end 19 through a snap-fit ​​structure 3, so that the working part 9 can be replaced, thereby allowing for the replacement of working parts 9 of different sizes or types. One of the drive end 19 and the working part 9 is provided with a snap-fit ​​liner 31 and a snap-fit ​​member 33. The snap-fit ​​liner 31 is provided with a snap-fit ​​member groove 311 that penetrates the snap-fit ​​liner 31. A sleeve 32 is fitted onto the snap-fit ​​liner 31. The sleeve 32 can move along the snap-fit ​​liner 31. An unlocking groove 321 is provided on the inner wall of the sleeve 32. The snap-fit ​​member 33 is disposed in the snap-fit ​​member groove 311 and can slide along the snap-fit ​​member groove 311. The other of the working part 9 and the drive end 19 is provided with a snap-fit ​​connector 34. The snap-fit ​​connector 34 has a snap-fit ​​groove 341. The snap-fit ​​connector 34 is inserted into the snap-fit ​​liner 31. A part of the snap-fit ​​member 33 is inserted into the snap-fit ​​groove 341, and the other part is attached to the inner wall of the sleeve 32 to prevent the snap-fit ​​member 33 from moving out of the snap-fit ​​groove 341, so that the snap-fit ​​connector 34 is connected to the snap-fit ​​liner 31. The cross-section of the snap-fit ​​connector 34 is generally square or otherwise non-circular and is inserted into the snap-fit ​​liner 31. The snap-fit ​​liner 31 or snap-fit ​​connector 34 connected to the drive end 19 can rotate with the drive end 19, and the snap-fit ​​connector 34 or snap-fit ​​liner 31 drives the working part 9 to rotate. The snap-fit ​​part 33 can be spherical or other shapes. Moving the sleeve 32 along the snap-fit ​​liner 31 so that the unlocking groove 321 is facing the snap-fit ​​part 33, the snap-fit ​​connector 34 can be moved away from the snap-fit ​​liner 31, so that the snap-fit ​​part 33 moves along the snap-fit ​​groove 311. After part of the snap-fit ​​part 33 enters the unlocking groove 321, the other part of the snap-fit ​​part 33 is pulled out from the snap-fit ​​groove 341. At this time, the snap-fit ​​connector 34 can be pulled out from the snap-fit ​​liner 31. Through the reverse process, the snap-fit ​​connector 34 can be installed onto the snap-fit ​​liner 31 and locked. This embodiment can quickly separate and install the working part 9 from the drive end 19, which is convenient for changing working parts 9 of different specifications. A snap-fit ​​elastic element 35 is provided between the snap-fit ​​liner 31 and the sleeve 32. The snap-fit ​​elastic element 35 causes the sleeve 32 to have a tendency to move relative to the snap-fit ​​liner 31. The movement tendency is that the unlocking groove 321 moves away from the snap-fit ​​element 33. This embodiment can ensure that the sleeve 32 will not move freely, that the snap-fit ​​element 33 is in close contact with the inner wall of the sleeve 32, and that the snap-fit ​​element 33 is stably inserted into the snap-fit ​​groove 341, thereby ensuring the reliability of the connection between the working part 9 and the drive end 19.

[0066] The terms used in this invention, such as "first," "second," etc., do not indicate any order, quantity, or importance, but are merely for distinction.

[0067] In this invention, terms such as "a" or "an" are used to indicate not a limitation on the quantity, but rather to indicate the existence of at least one of the mentioned objects.

[0068] In this utility model, terms indicating direction or location such as top, bottom, side, longitudinal, transverse, middle, center, outside, inside, horizontal, vertical, left, right, above, and below are used to indicate relative positions rather than absolute positions.

[0069] Terms used in this invention, such as "approximately," "generally," "approximately," and "similar," are limiting terms used to indicate features that are present but allow for certain deviations. The amount of deviation allowed may vary depending on the specific context; for example, regarding dimensional deviations, the specific context may include, but is not limited to, relevant standards for dimensional tolerances.

Claims

1. A power tool comprising a main unit (1) and a knob assembly (2) rotatably connected to the main unit (1), wherein, The host (1) includes a carrier (11), a drive device (18), an output terminal (19) that is driven by the drive device (18) and a control component (13) connected to the carrier (11); Its features are that, while the knob assembly (2) is close to the host (1) and rotates to be connected to the host (1), the knob assembly (2) is connected to the control assembly (13) so that the knob assembly (2) can drive at least part of the control assembly (13) to rotate, the carrier (11) is provided with a positioning structure (111), the positioning structure (111) is configured to position the control assembly (13); the positioning structure (111) is configured such that the control assembly (13) can abut against the positioning structure (111) during rotation to limit the rotation range of the control assembly (13).

2. The power tool according to claim 1, characterized in that, The positioning structure (111) includes at least a first limiting post (1111) and a second limiting post (1112), the first limiting post (1111) and the second limiting post (1112) are spaced apart, and the control component (13) rotates within the range of the first limiting post (1111) and the second limiting post (1112).

3. The power tool according to claim 1, characterized in that, The control component (13) is provided with a lever (131), and the knob component (2) can drive the lever (131) to rotate. The lever (131) and the positioning structure (111) have an overlapping part in the height direction.

4. The power tool according to claim 1, characterized in that, The host (1) also includes an end circuit board (121); the end circuit board (121) is fixed on the upper part of the positioning structure (111).

5. The power tool according to claim 1, characterized in that, The knob cover (21) is provided with a rotating connection groove (219), the inner wall of the rotating connection groove (219) is in contact with the main unit (1), the knob cover (21) is provided with a lever groove (211), one end of the lever (131) is inserted into the lever groove (211), and the lever groove (211) is set in the height direction.

6. The power tool according to claim 5, characterized in that, The knob cover (21) is provided with an anti-detachment protrusion (213), and the main unit (1) also includes a detachable frame (112). The detachable frame (112) is fixedly connected to the top of the positioning structure (111), and the bottom surface of the detachable frame (112) is in contact with or close to the anti-detachment protrusion (213).

7. The power tool according to claim 5, characterized in that, The upper part of the positioning structure (111) extends outward to form a boss. The top of the positioning structure (111) passes through the end circuit board (121) and is fixedly connected to the detachable frame (112), so that the detachable frame (112) and the boss clamp the end circuit board (121).

8. The power tool according to claim 1, characterized in that, One of the carrier (11) and the knob cover (21) is provided with a gear position groove (223). The gear position groove (223) is provided with a support member (221) and a gear position elastic member (222) that abuts against the support member (221) and the inner wall of the gear position groove (223). The other of the carrier (11) and the knob cover (21) is provided with multiple gear position slots (224). The support member (221) can slide along the gear position groove (223) and has a tendency to approach the gear position slot (224).

9. The power tool according to claim 1, characterized in that, The control component host (1) is provided with a light-emitting device (151); the light-emitting device (151) is configured to change its light-emitting state as the knob assembly (2) is rotated.

Images