electric screwdriver

Abstract

This utility model relates to the field of power tool technology, specifically an electric screwdriver. An electric screwdriver includes: a working head, a motor, an MCU control chip, a housing, a segmented push-button switch, and an operation button. The segmented push-button switch includes a first signal switch and a second signal switch. The first signal switch has a first switch pin for outputting a signal, and the second signal switch has a second switch pin for outputting a signal. The first switch pin is electrically connected to one pin of the MCU control chip, and the second switch pin is electrically connected to the other pin of the MCU control chip. The operation button is located on the grip and has a pressing part for the operator to press. The pressing part has an initial position, a first trigger position, and a second trigger position relative to the housing. The advantage of this utility model is its ease of operation; the motor can be started and high / low speed adjustment can be achieved simply by pressing the operation button.

Description

Technical Field

[0001] This utility model relates to the field of power tool technology, specifically an electric screwdriver. Background Technology

[0002] An electric screwdriver is a tool that uses a motor to drive the working head to rotate. Working attachments are mounted on the working head, and the rotation of the working head causes the attachments to rotate as well. Depending on the working attachments selected, the electric screwdriver performs different functions. Common working attachments include screwdriver bits, drill bits, grinding heads, or rotary cutting heads.

[0003] Existing methods for adjusting the speed of electric screwdrivers involve either using a travel trigger or a separate high / low speed switch. Using a high / low speed switch prevents simultaneous one-handed control of the trigger while adjusting the speed, thus compromising operation. Using a travel trigger, however, is problematic because travel triggers are expensive and require additional analog-to-digital converters for signal conversion. Utility Model Content

[0004] The purpose of this invention is to provide an electric screwdriver to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An electric screwdriver, comprising:

[0007] The working head is used to install working accessories;

[0008] The motor drives the working head to rotate;

[0009] MCU control chip, used to control motor;

[0010] The housing forms a gripping part for the operator to hold;

[0011] A segmented push-button switch includes a first signal switch and a second signal switch. The first signal switch has a first switch pin for outputting a signal, and the second signal switch has a second switch pin for outputting a signal. The first switch pin is electrically connected to one pin of an MCU control chip; the second switch pin is electrically connected to the other pin of the MCU control chip.

[0012] The operation button is located on the grip and has a pressing part for the operator to press, wherein the pressing part has an initial position, a first trigger position and a second trigger position relative to the housing;

[0013] The electric screwdriver has a high-speed mode and a low-speed mode; the motor speed is higher in high-speed mode than in low-speed mode.

[0014] When the pressing part is pressed and moves from the initial position to the first trigger position, the operation button squeezes the segmented pressing switch to trigger the first signal switch. The MCU control chip receives the electrical signal from the first switch pin and controls the motor to start and run in low speed mode.

[0015] When the pressing part is pressed and moves from the first trigger position to the second trigger position, the operation button continues to press the segmented push switch to trigger the second signal switch. The MCU control chip receives the electrical signal from the second switch pin and controls the motor to run in high-speed mode.

[0016] As a further embodiment of this utility model: there are two segmented push-button switches; each pressing part corresponds to one segmented push-button switch;

[0017] A segmented push-button switch controls the motor to rotate forward when it is running;

[0018] Another segmented push-button switch controls the motor to reverse when it is running.

[0019] As a further embodiment of this utility model: the two pressing parts are formed from the two ends of the same operation button.

[0020] As a further embodiment of this utility model: the electric screwdriver also includes: a PCB board and an anti-accidental touch bracket; the MCU control chip, the anti-accidental touch bracket, and two segmented push switches are all mounted on the PCB board; the anti-accidental touch bracket is located between the two segmented push switches; after one of the pressing parts is pressed, the anti-accidental touch bracket abuts against the middle of the operation button; the anti-accidental touch bracket includes: a support leg and a support part for abutting against the operation button; the support part is connected to the PCB board through the support leg; a wire passage gap is formed between the support part and the PCB board.

[0021] As a further embodiment of this utility model: the number of support legs is several; both ends of the support part are connected to support legs.

[0022] As a further embodiment of this utility model, the electric screwdriver also includes: an anti-accidental contact switch; the anti-accidental contact switch has an on position and an off position;

[0023] When the anti-accidental touch switch is in the closed position, the motor will not start after the segmented push switch is triggered;

[0024] When the anti-accidental touch switch is in the start position, the motor will not start after the segmented push switch is triggered.

[0025] As a further embodiment of this utility model: the anti-accidental touch switch is an electric torque adjustment device; the number of starting positions is several, and each starting position corresponds to a different torque;

[0026] At each start position, the anti-accidental touch switch generates a different electrical signal, and the MCU control chip controls the motor to run at different torques based on the electrical signal generated by the anti-accidental touch switch.

[0027] As a further embodiment of this utility model, the electric screwdriver also includes: a gearbox, a battery, and a PCB board; the motor drives the working head to rotate through the gearbox; the MCU control chip and the segmented push-button switch are mounted on the PCB board; the motor, gearbox, PCB board, and battery are located inside the housing.

[0028] As a further embodiment of this utility model, the electric screwdriver also includes: an inner frame; the PCB board, battery, motor and gearbox are integrally mounted to the inner frame; the motor and gearbox are integrally mounted to the inner frame; the motor, gearbox and battery are arranged in a straight line along the axis of the motor; the housing is an integrally formed cylindrical structure; the inner frame is inserted into the housing.

[0029] As a further embodiment of this utility model: the PCB board and the battery are arranged side by side and located inside the grip; the battery is enclosed by the inner frame and the PCB board.

[0030] Compared with existing technologies, the advantages of this invention are: convenient operation, the motor can be started and high / low speed can be adjusted simply by pressing the operation button; and lower cost and smaller stroke compared to a travel trigger.

[0031] The segmented push-button switch can control high and low speeds as well as forward and reverse rotation.

[0032] The anti-accidental touch bracket prevents both pressing parts from pressing down simultaneously. The trace clearance allows traces on the PCB board and external traces or components to pass through, preventing the anti-accidental touch bracket from affecting the PCB board traces. The support part 312 also provides protection for the electronic components below.

[0033] Other features and advantages of this utility model will be disclosed in detail in the following specific embodiments and accompanying drawings. Attached Figure Description

[0034] Figure 1 This is a perspective view of the electric screwdriver of this utility model;

[0035] Figure 2 for Figure 1 Plan view of a medium-sized electric screwdriver;

[0036] Figure 3 yes Figure 2 A schematic diagram showing a partial cross-section of a medium-sized electric screwdriver;

[0037] Figure 4 yes Figure 3 Enlarged view of the cutaway section of a medium-sized electric screwdriver;

[0038] Figure 5 yes Figure 1 A schematic diagram of an electric screwdriver removing the housing;

[0039] Figure 6 yes Figure 5 A schematic diagram showing the separation of the internal frame of the structure;

[0040] Figure 7 yes Figure 6 A schematic diagram of the PCB board with a medium-sized structure, operation buttons, segmented push-button switches, and anti-accidental touch bracket;

[0041] Figure 8 yes Figure 7 Enlarged view of a portion of the structure;

[0042] Figure 9 yes Figure 8 Internal circuit diagram of a segmented push-button switch with a medium-sized structure;

[0043] Figure 10 yes Figure 1 Circuit diagram of the MCU control chip for the electric screwdriver;

[0044] Figure 11 yes Figure 1 The equivalent circuit diagram of the segmented push-button switch 33 of the electric screwdriver.

[0045] List of reference numerals: Power tool 100, working head 10, motor 20, PCB board 30, anti-accidental touch bracket 31, support leg 311, support part 312, wire guide gap 3101, segmented push switch 33, first signal switch 331, second signal switch 332, housing 40, grip part 41, operation button 50, pressing part 51, anti-accidental touch switch 60, gearbox 70, battery 80, inner frame 90. Detailed Implementation

[0046] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0047] like Figures 1-3 and Figure 6 As shown, an electric screwdriver 100 includes: a working head 10, a motor 20, a housing 40, and an operation button 50.

[0048] The working head 10 is used to mount working accessories. Working accessories can be screwdriver bits, drill bits, grinding heads, or rotary cutting heads, etc. In one specific embodiment, the working head 10 mounts the working accessories by inserting them. Specifically, the working head 10 has a shaft-like structure. Alternatively, the working head can also be a drill chuck structure, clamping the working accessories in a gripping manner.

[0049] The motor 20 drives the working head 10 to rotate. In one specific embodiment, the electric screwdriver 100 also includes a gearbox 70. The motor 20 drives the working head 10 to rotate via the gearbox 70. Alternatively, the gearbox can be omitted, and the working head can be directly driven by the motor. That is, the working head is formed by the motor shaft or connected to the motor shaft. The connection can be direct or indirect. For example, the working head can be directly connected to the motor shaft or connected to the motor shaft via a coupling.

[0050] The housing 40 forms a grip portion 41 for the operator to hold. The grip portion 41 may be provided with a soft rubber structure for comfortable gripping. The grip portion 41 may be provided with a structure for increasing friction to facilitate gripping. Specifically, a structure for increasing friction is formed on the soft rubber structure. The structure for increasing friction is provided as stripes. As an optional embodiment, the structure for increasing friction may also be provided as other structures, such as knurling, raised dots, etc.

[0051] Operation buttons 50 are located on the grip portion 41. The user's hand holding the grip portion 41 can simultaneously control the operation buttons 50. The operation buttons 50 are provided with pressing parts 51 for the operator to press. By pressing the pressing parts 51, the operation buttons 50 are operated, thereby controlling the motor 20.

[0052] In one specific implementation, the electric screwdriver 100 also includes an MCU control chip. The MCU control chip is used to control the motor 20. For example... Figures 6 to 8 As shown, specifically, the electric screwdriver 100 also includes a PCB board 30. An MCU control chip is mounted on the PCB board 30.

[0053] like Figures 8 to 11 As shown, in a preferred embodiment, the segmented push-button switch 33 includes a first signal switch 331 and a second signal switch 332. That is, the segmented push-button switch 33 integrates at least two signal switches. The segmented push-button switch 33 emits different electrical signals when pressed to different positions by segmented pressing.

[0054] Specifically, the first signal switch 331 has a first switch pin for outputting a signal. The second signal switch 332 has a second switch pin for outputting a signal. The first switch pin is electrically connected to one pin of the MCU control chip. The second switch pin is electrically connected to another pin of the MCU control chip.

[0055] The pressing part 51 has an initial position, a first trigger position, and a second trigger position relative to the housing 40. In the initial position, that is, when the pressing part 51 is not pressed, the motor 20 does not start.

[0056] The electric screwdriver 100 has a high-speed mode and a low-speed mode; in the high-speed mode, the speed of the motor 20 is greater than that in the low-speed mode.

[0057] When the pressing part 51 is pressed and moves from the initial position to the first trigger position, the operation button 50 squeezes the segmented pressing switch 33 to trigger the first signal switch 331. The MCU control chip receives the electrical signal from the first switch pin and controls the motor 20 to start and run in low speed mode.

[0058] When the pressing part 51 is pressed and moves from the first trigger position to the second trigger position, the operation button 50 continues to press the segmented pressing switch 33 to trigger the second signal switch 332. The MCU control chip receives the electrical signal from the second switch pin and controls the motor 20 to run in high-speed mode.

[0059] When operating in high-speed mode, as the user reduces the pressure applied to the pressing part 51, the segmented pressing switch 33 rebounds, the second signal switch 332 opens, and the pressing part 51 moves from the second trigger position to the first trigger position. At this time, the MCU control chip controls the motor 20 to operate in low-speed mode. If the user continues to reduce the pressure applied to the pressing part 51, the segmented pressing switch 33 continues to rebound, the first signal switch 331 opens, and the pressing part 51 moves from the first trigger position to its initial position. At this time, the motor 20 is turned off.

[0060] Operation button 50 can simultaneously start and adjust the speed. Compared to traditional travel triggers, the control circuit is simpler and does not require complex analog-to-digital conversion circuits.

[0061] refer to Figure 9 The segmented push-button switch 33 includes a first signal switch 331 and a second signal switch 332. The two ends of the first signal switch 331 are connected to pins B and D. The two ends of the second signal switch 331 are connected to pins B and C. The connection point between pins A and C is specified. For ease of explanation, the two segmented push-button switches 33 are defined as key1 and key2, respectively. Taking key1 as an example, refer to [reference needed]. Figures 9 to 11Pin B is grounded, and pins D and C serve as the first and second switch pins, respectively. Since pin C is connected to pin A, pin A can also be used instead of pin C. The first and second switch pins send electrical signals to pins 16 and 17 of the MCU control chip U3. With pin B grounded, the first and second switch pins generate low-level signals through the closure of the first signal switch 331 and the second signal switch 332. Alternatively, pin B can be connected to the positive terminal of the circuit as needed, so that the first and second switch pins generate high-level signals through the closure of the first signal switch 331 and the second signal switch 332.

[0062] In one specific implementation, the segmented push-button switch 33 consists of a first signal switch 331 and a second signal switch 332. The circuit between the first signal switch 331 and the second signal switch 332 is not limited to... Figure 9 The method shown is correct. Other methods can also be used, as long as the first and second switch pins can generate electrical signals based on the on / off states of the first and second signal switches. For example, a common-powered pin B configuration can be equivalent to two independent signal switches.

[0063] The electrical signal emitted from the first switch pin is independently generated by the first signal switch 331, and the electrical signal emitted from the second switch pin is independently generated by the second signal switch 332. Alternatively, the electrical signals emitted from the first and second switch pins can be generated jointly by the first and second signal switches. For example, when one of the first and second signal switches is triggered, one of the first and second switch pins emits an electrical signal. When both the first and second signal switches are triggered simultaneously, the other of the first and second switch pins emits an electrical signal. For example... Figure 9 The internal circuit of the segmented push-button switch 33 shown is configured such that pin D is grounded or the positive terminal of the circuit. Pins A and B serve as the first and second switch pins, respectively, and emit electrical signals. Pins A and B are connected to two different pins of the MCU control chip. Pins A and C are connected, or pin C can be used instead of pin A. After the first signal switch is triggered, pin B emits an electrical signal; after both the first and second signal switches are triggered simultaneously, pin A emits an electrical signal.

[0064] As one specific implementation, the segmented push-button switch 33 has two pressing strokes, which respectively trigger the first signal switch 331 and the second signal switch 332. As an optional implementation, a pressing stroke with more segments can be selected, such as three segments, to achieve three-level speed regulation.

[0065] like Figure 3 , Figure 4 , Figures 6-8 As shown, in a preferred embodiment, there are two segmented push-button switches 33. Each pressing part 51 corresponds to one segmented push-button switch 33. When one segmented push-button switch 33 controls the motor 20 to run, the motor 20 rotates forward; when the other segmented push-button switch 33 controls the motor 20 to run in reverse. When the two segmented push-button switches 33 are pressed to different strokes, it corresponds to the motor 20 running forward at high speed, the motor 20 running forward at low speed, the motor 20 running in reverse at high speed, and the motor 20 running in reverse at low speed, respectively. This simple method achieves forward and reverse rotation control of the motor 20 at high and low speeds. It eliminates the need for separate speed switching control switches, separate direction switching control switches, and start switches, making operation convenient.

[0066] In a preferred embodiment, the two pressing portions 51 are formed from both ends of the same operation button 50. The operation button 50 is integrally molded, reducing the number of parts and facilitating assembly. The arrangement of forming two pressing portions 51 at each end ensures that the two pressing portions 51 are as far apart as possible.

[0067] like Figure 3 , Figure 4 , Figure 7 and Figure 8 As shown, in a preferred embodiment, the electric screwdriver 100 further includes an anti-accidental-touch bracket 31. The anti-accidental-touch bracket 31 is mounted on the PCB board 30. The MCU control chip, the anti-accidental-touch bracket 31, and the two segmented push-button switches 33 are all mounted on the PCB board 30, reducing the number of PCB boards, as the switch circuit board and control circuit board share a single circuit board. The anti-accidental-touch bracket 31 is located between the two segmented push-button switches 33. After one pressing part 51 is pressed, the anti-accidental-touch bracket 31 abuts against the middle of the operation button 50, preventing accidental touches caused by the other side simultaneously descending when one side is pressed. The anti-accidental-touch bracket 31 creates a rocker effect. Since the anti-accidental-touch bracket 31 and the two segmented push-button switches 33 are mounted on the same PCB board 30, the force on the anti-accidental-touch bracket 31 is directly and rigidly transmitted to the PCB board 30, ensuring the anti-accidental-touch effect compared to mounting the anti-accidental-touch bracket in other positions.

[0068] like Figure 4 , Figure 7 and Figure 8As shown, in a preferred embodiment, the anti-accidental touch bracket 31 includes: a support leg 311 and a support portion 312 for abutting against the operation button 50. The support portion 312 is connected to the PCB board 30 via the support leg 311. A trace gap 3101 is formed between the support portion 312 and the PCB board 30. In one specific embodiment, there are two support legs 311, which are disposed at both ends of the support portion 312 to support the support portion 312 from both sides. In an optional embodiment, there is only one support leg, in which case the anti-accidental touch bracket 31 provides single-point support. In another optional embodiment, there are three or more support legs to achieve multi-point support. When there are two or more support legs, both ends of the support portion are connected to the support leg, thereby ensuring the reliability of the support. The through gap 3101 allows the traces on the PCB board 30 and external traces or devices to pass through, preventing the anti-accidental contact bracket 31 from affecting the traces on the PCB board 30. The support part 312 can also protect the electronic components below.

[0069] like Figure 3 and Figure 6 As shown, in a preferred embodiment, the electric screwdriver 100 further includes an anti-accidental-touch switch 60. The anti-accidental-touch switch 60 has an active position and an active position. When the anti-accidental-touch switch 60 is in the active position, the motor 20 will not start after the segmented push-button switch 33 is triggered; when the anti-accidental-touch switch 60 is in the active position, the motor 20 will not start after the segmented push-button switch 33 is triggered. The anti-accidental-touch switch 60 prevents accidental activation of the operating button 50.

[0070] In a preferred embodiment, the anti-accidental touch switch 60 is an electrical torque adjustment device. It has several starting positions, each corresponding to a different torque. The initial position of the anti-accidental touch switch 60 is the closed position. When the anti-accidental touch switch 60 moves to different torque levels, the segmented push-button switch 33 can be controlled via the operation button 50 to start the motor 20. Since the anti-accidental touch switch 60 is an electrical torque adjustment device, each starting position can also be considered a torque level of the torque switch. In each starting position, the anti-accidental touch switch 60 generates different electrical signals, and the MCU control chip controls the motor 20 to operate at different torques based on the electrical signals generated by the anti-accidental touch switch 60.

[0071] The electric screwdriver 100 also includes a battery 80. The battery 80 powers the motor 20. Alternatively, the electric screwdriver may not have a battery and may be powered by an external power source, which can be either DC or AC voltage. Specifically, the battery 80 is housed within the housing 40. More specifically, the motor 20, gearbox 70, PCB board 30, and battery 80 are located within the housing 40. Alternatively, the housing may consist of multiple parts. These parts may be either movably connected or fixedly connected.

[0072] like Figure 3 , Figure 5 and Figure 6 As shown, in a preferred embodiment, the electric screwdriver 100 further includes an inner frame 90. The PCB board 30, battery 80, motor 20, and gearbox 70 are integrally mounted to the inner frame 90.

[0073] The motor 20 and gearbox 70 are integrally mounted to the inner frame 90. The motor 20, gearbox 70, and battery 80 are arranged in a straight line along the axis of the motor 20. The housing 40 is a one-piece cylindrical structure. The inner frame 90 is inserted into the housing 40. This arrangement allows for the installation of the internal structure within the inner frame 90, eliminating the need for screws to secure the internal structure to the cylindrical structure of the housing 40. The structure is compact, and the inner frame 90 is easy to install.

[0074] In a preferred embodiment, the PCB board 30 and the battery 80 are arranged side by side and located within the grip portion 41. The inner frame 90 and the PCB board 30 together enclose the battery 80. The structure is compact, and the battery 80 is well protected.

[0075] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0076] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An electric screwdriver (100), characterized in that, include: The working head (10) is used to install working accessories; The motor (20) drives the working head (10) to rotate; MCU control chip, used to control the motor (20); The housing (40) forms a grip (41) for the operator to hold. The segmented push-button switch (33) includes a first signal switch (331) and a second signal switch (332). The first signal switch (331) has a first switch pin for outputting a signal, and the second signal switch (332) has a second switch pin for outputting a signal. The first switch pin is electrically connected to one pin of the MCU control chip, and the second switch pin is electrically connected to another pin of the MCU control chip. An operation button (50) is provided on the grip (41) and a pressing part (51) is provided for the operator to press, wherein the pressing part (51) has an initial position, a first trigger position and a second trigger position relative to the housing (40); The electric screwdriver (100) has a high-speed mode and a low-speed mode; in the high-speed mode, the rotational speed of the motor (20) is greater than that in the low-speed mode. When the pressing part (51) is pressed and moves from the initial position to the first trigger position, the operation button (50) squeezes the segmented pressing switch (33) to trigger the first signal switch (331). The MCU control chip receives the electrical signal from the first switch pin and controls the motor (20) to start and run in the low-speed mode. When the pressing part (51) is pressed and moves from the first trigger position to the second trigger position, the operation button (50) continues to press the segmented pressing switch (33) to trigger the second signal switch (332), and the MCU control chip receives the electrical signal of the second switch pin to control the motor (20) to run in the high-speed mode.

2. The electric screwdriver (100) according to claim 1, characterized in that, There are two segmented push-button switches (33); each push-button part (51) corresponds to one segmented push-button switch (33). When the segmented push-button switch (33) controls the operation of the motor (20), the motor (20) rotates in the forward direction; When another segmented push switch (33) controls the operation of the motor (20), the motor (20) reverses.

3. The electric screwdriver (100) according to claim 2, characterized in that, The two pressing parts (51) are formed from the two ends of the same operation button (50).

4. The electric screwdriver (100) according to claim 3, characterized in that, The electric screwdriver (100) also includes: a PCB board (30) and an anti-accidental touch bracket (31). The MCU control chip, the anti-accidental touch bracket (31), and the two segmented push switches (33) are all mounted on the PCB board (30); the anti-accidental touch bracket (31) is located between the two segmented push switches (33); after one of the pressing parts (51) is pressed, the anti-accidental touch bracket (31) abuts against the middle of the operation button (50); The anti-accidental touch bracket (31) includes: a support leg (311) and a support part (312) for abutting against the operation button (50). The support part (312) is connected to the PCB board (30) through the support leg part (311); a wire passage gap (3101) is formed between the support part (312) and the PCB board (30).

5. The electric screwdriver (100) according to claim 4, characterized in that, The number of the support legs (311) is several; both ends of the support part (312) are connected to the support legs (311).

6. The electric screwdriver (100) according to claim 1, characterized in that, The electric screwdriver (100) further includes: an anti-accidental contact switch (60); the anti-accidental contact switch (60) has an on position and an off position; When the anti-accidental touch switch (60) is in the closed position, the motor (20) will not start after the segmented push switch (33) is triggered; When the anti-accidental touch switch (60) is in the start position, the motor (20) will not start after the segmented push switch (33) is triggered.

7. The electric screwdriver (100) according to claim 6, characterized in that, The anti-accidental touch switch (60) is an electric torque adjustment device; the number of the starting positions is several, and each starting position corresponds to a different torque; At each of the start-up positions, the anti-accidental touch switch (60) generates different electrical signals, and the MCU control chip controls the motor (20) to run at different torques based on the electrical signals generated by the anti-accidental touch switch (60).

8. The electric screwdriver (100) according to claim 1, characterized in that, The electric screwdriver (100) also includes: a gearbox (70), a battery (80) and a PCB board (30); the motor (20) drives the working head (10) to rotate through the gearbox (70); the MCU control chip and the segmented push switch (33) are mounted on the PCB board (30); the motor (20), the gearbox (70), the PCB board (30) and the battery (80) are located inside the housing (40).

9. The electric screwdriver (100) according to claim 8, characterized in that, The electric screwdriver (100) further includes: an inner frame (90); the PCB board (30), the battery (80), the motor (20) and the gearbox (70) are integrally mounted to the inner frame (90); the motor (20) and the gearbox (70) are integrally mounted to the inner frame (90); the motor (20), the gearbox (70) and the battery (80) are arranged in a straight line along the axis of the motor (20); the housing (40) is an integrally formed cylindrical structure; the inner frame (90) is inserted into the housing (40).

10. The electric screwdriver (100) according to claim 9, characterized in that, The PCB board (30) and the battery (80) are arranged side by side and located within the grip (41); The battery (80) is enclosed by the inner frame (90) and the PCB board (30).

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