A step-type electric screw gun

Abstract

The utility model discloses a kind of ladder type electric screw gun, it is related to electric screw gun technical field, including electric gun main body and gun head, the connecting end of electric gun main body is provided with servo drive device, gun head includes shell, internal hex sleeve, brake bit fixed cylinder and brake bit, brake bit fixed cylinder and brake bit transmission connection, second servo motor is provided on shell, two chambers are provided in shell, first drive module and second drive module are respectively provided in two chambers, first drive module and second drive module are respectively used to drive internal hex sleeve, brake bit fixed cylinder rotation, the execution end of internal hex sleeve is used to drive locking nut rotation, brake bit fixed cylinder is rotationally arranged in internal hex sleeve, the utility model patent is driven brake bit fixed cylinder low-speed rotation by second servo motor and second drive module, realizes the quick calibration of brake bit and piston rod inner wall.

Description

Technical Field

[0001] This invention patent relates to the field of electric screwdriver technology, specifically a stepped electric screwdriver. Background Technology

[0002] In the production of automotive front air spring assemblies, electric screwdrivers play an indispensable role. Driven by electric current, electric screwdrivers can quickly and continuously complete screw tightening operations, thereby greatly improving the production efficiency of automotive front air spring assembly. Especially when assembling the shock absorber body and the air spring sub-assembly of the front air spring assembly, the electric screwdriver will first move horizontally to the top of the air spring sub-assembly and ensure that the actuator of the electric screwdriver is aligned with the locking nut on the air spring sub-assembly. Then, the electric screwdriver will move vertically until the locking nut is inserted into the actuator of the electric screwdriver. The electric screwdriver will then stop moving and start the actuator to tighten the locking nut. During the tightening process, the electric screwdriver will move downward with the locking nut.

[0003] Existing electric screwdrivers have a brake bit for inserting into the piston rod and an internal hex socket for tightening and tightening the lock nut. Before tightening and tightening the lock nut, the brake bit must be inserted into the piston rod, and the angle of rotation of the piston rod caused by the brake bit before insertion must not exceed 30°. Only then can the internal hex socket begin tightening and tightening the lock nut. However, the brake bit angle of existing electric screwdrivers is mostly fixed, which cannot meet the above requirements. Therefore, we have invented a stepped electric screwdriver with a rotatable and calibrable brake bit. Summary of the Invention

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

[0005] To solve the above-mentioned technical problems, this invention provides the following technical solution: a stepped electric screwdriver, comprising an electric screwdriver body and a screwdriver head. A servo drive device is provided at the connecting end of the electric screwdriver body. The screwdriver head includes a housing, an internal hexagonal socket, a brake bit fixing sleeve, and a brake bit. The brake bit fixing sleeve and the brake bit are connected in a transmission manner. A pressure spring is sleeved on the brake bit fixing sleeve, and the pressure spring rebounds and contracts with the extension and retraction of the brake bit fixing sleeve. A second servo motor is provided on the housing. The housing contains two chambers, upper and lower, each containing a first drive module and a second drive module. The servo drive device and the second servo motor are used to drive the first drive module and the second drive module to operate, respectively. The first drive module and the second drive module are used to drive the internal hexagonal socket and the brake bit fixing sleeve to rotate, respectively. The actuating end of the internal hexagonal socket is used to drive the locking nut to rotate. The brake bit fixing sleeve is rotatably disposed within the internal hexagonal socket.

[0006] Furthermore, the first drive module includes a first drive gear and a first driven gear that mesh with each other on their outer walls. The first drive gear is connected to the execution end of the servo drive device. The first driven gear is integrally formed with the internal hexagonal sleeve and is rotatably connected to the lower cavity. The second drive module includes a second driven gear and a second drive gear that mesh with each other on their outer walls. The second driven gear is connected to the brake bit fixing cylinder. The second drive gear is connected to the execution end of the second servo motor.

[0007] Furthermore, the brake bit fixing cylinder includes a transmission section with a regular hexagonal cross-section and an execution section with a circular cross-section arranged sequentially from top to bottom. The bottom end of the inner wall of the upper chamber is provided with a first through hole connecting the first driven gear and the inner wall of the hexagonal socket. The top end of the transmission section passes through the hexagonal socket, the first driven gear, and the first through hole sequentially from bottom to top, and is connected to the second driven gear. The outer wall of the transmission section fits and slides against the inner wall of the second driven gear. A pressure spring is sleeved on the transmission section located inside the hexagonal socket. The upper and lower ends of the pressure spring abut against the top end of the inner wall of the lower chamber and the top end of the execution section, respectively. The top end of the inner wall of the upper chamber is provided with a second through hole for the transmission section to pass through. The outer wall of the execution section is rotatably connected to the inner wall of the hexagonal socket. The bottom end of the execution section is connected to the brake bit.

[0008] Furthermore, the brake bit fixing cylinder also includes a connecting section disposed at the top of the transmission section. The connecting section extends out of the top of the housing and is threadedly connected to a circular limiting block. The top of the housing is integrally provided with a limiting cylinder whose inner wall fits and slides with the outer wall of the circular limiting block.

[0009] Furthermore, the bottom end of the internal hexagonal socket is provided with a connecting groove for connecting a lock nut, and the connecting groove communicates with the inner wall of the internal hexagonal socket.

[0010] Furthermore, a circular magnet is provided at the top of the inner wall of the connecting groove.

[0011] Furthermore, a probe rod is slidably connected inside the brake bit fixing cylinder. The top end of the probe rod extends out of the top end of the brake bit fixing cylinder, and the bottom end of the probe rod is fixedly connected to the top end of the brake bit and is equipped with a displacement sensor.

[0012] The beneficial effects achieved by this invention patent are as follows: The brake bit fixing cylinder is driven to rotate at low speed by the second servo motor and the second drive module, which realizes the rapid calibration of the orientation of the brake bit and the piston rod. This avoids the problem of the piston rod rotating before the brake bit is inserted into the piston rod, and ensures the stability and reliability of the assembly state.

[0013] The dual drive system design of servo drive unit and second servo motor enables independent and precise control of hexagon socket and brake bit fixing sleeve to meet the needs of different operation stages, improving the flexibility of operation and the stability of angle relationship control.

[0014] The segmented design of the brake bit fixing cylinder (transmission section and execution section) and the application of pressure springs enable the brake bit to have adaptive extension and retraction capabilities during docking, effectively addressing positional deviations during docking and improving operational stability and reliability.

[0015] The use of limit blocks and limit cylinders effectively prevents the brake bit fixing cylinder from detaching, enhancing the safety and durability of the equipment. At the same time, the use of ring magnets also prevents the locking nut from detaching, further ensuring the continuity of operation.

[0016] Intelligent control of the servo drive device and the second servo motor is achieved through the cooperation of displacement sensors and external control units. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of a stepped electric screwdriver in one embodiment; Figure 2 This is a cross-sectional view of the gun head in the embodiment; Figure 3 This is a cross-sectional view of the brake bit and piston rod in the embodiment. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] like Figures 1-2As shown, this invention discloses a stepped electric screwdriver, comprising: an electric screwdriver body 1 and a screwdriver head 2. A servo drive device 11 is provided at the connecting end of the electric screwdriver body 1. The servo drive device 11 consists of a first servo motor disposed within the electric screwdriver body 1, a first helical gear connected to the execution end of the first servo motor, a second helical gear meshing with the first helical gear, and a transmission rod connected to the bottom end of the second helical gear. The transmission rod is the execution end of the servo drive device 11. The screwdriver head 2 includes a housing 21, an internal hexagonal sleeve 22, a brake bit fixing sleeve 23, and a brake bit 24. The brake bit fixing sleeve 23 and the brake bit 24 are connected in a transmission manner. A pressure spring 235 is sleeved on the fixed cylinder 23. The pressure spring 235 rebounds and contracts as the brake bit fixed cylinder 23 extends and retracts. A second servo motor 3 is provided on the housing 21. The housing 21 has two chambers, upper and lower. A first drive module and a second drive module are respectively provided in the two chambers. The servo drive device 11 and the second servo motor 3 are used to drive the first drive module and the second drive module to operate, respectively. The first drive module and the second drive module are used to drive the internal hexagonal sleeve 22 and the brake bit fixed cylinder 23 to rotate, respectively. The actuator end of the internal hexagonal sleeve 22 is used to drive the locking nut to rotate. The brake bit fixed cylinder 23 is rotatably disposed inside the internal hexagonal sleeve 22.

[0020] Based on the above structure, such as Figures 1-2 As shown, when the electric screwdriver moves vertically downwards to engage the locking nut, the brake bit 24 first abuts against the top of the piston rod. Then, the electric screwdriver moves vertically until the locking nut is inserted into the actuating end of the internal hex socket 22. During this process, because the external thread angle of the outer wall of the brake bit 24 does not match the inner wall of the piston rod, the brake bit 24 cannot be inserted into the piston rod. The brake bit 24 moves upwards, pushing the brake bit fixing cylinder 23 upwards. The pressure spring 235 contracts, and at this time, the second servo motor 3 is activated. The second servo motor 3 drives the brake bit fixing cylinder 23 to rotate at low speed through the second drive module. The brake bit fixing cylinder 23 drives the brake bit 24 to rotate. The process continues until the brake bit 24 is aligned with the inner wall of the piston rod. The pressure spring 235 then rebounds and pushes the brake bit 24 into the piston rod. After that, the second servo motor 3 stops rotating, the servo drive device 11 starts, and drives the hex socket 22 to rotate through the first drive module. The hex socket 22 drives the locking nut to be tightened. During the tightening of the locking nut, the electric screwdriver moves vertically with the locking nut. After the locking nut is tightened, the electric screwdriver moves vertically upward to release the connection between the hex socket 22 and the locking nut, and at the same time release the connection between the brake bit 24 and the piston rod, waiting to tighten the locking nut for the next automotive front air spring assembly.

[0021] Furthermore, such as Figure 2As shown, the first drive module includes a first drive gear 25 and a first driven gear 26 that mesh with each other on their outer walls. The first drive gear 25 is connected to the execution end of the servo drive device 11. The first driven gear 26 is integrally formed with the internal hexagonal sleeve 22 and is rotatably connected to the lower cavity. The second drive module includes a second driven gear 27 and a second drive gear 28 that mesh with each other on their outer walls. The second driven gear 27 is connected to the brake bit fixing cylinder 23. The second drive gear 28 is connected to the execution end of the second servo motor 3. In use, the servo drive device 11 drives the first drive gear 25 to rotate the first passive gear 26 through meshing, and the first passive gear 26 drives the internal hexagonal sleeve 22 to rotate. The second servo motor 3 drives the second drive gear 28 to rotate the second driven gear 27 through meshing, and the second driven gear 27 drives the brake bit 24 to rotate through the brake bit fixing cylinder 23.

[0022] Furthermore, such as Figure 2 As shown, the brake bit fixing cylinder 23 includes a transmission section 232 with a regular hexagonal cross-section (not shown in the figure) and an execution section 233 with a circular cross-section (not shown in the figure), arranged sequentially from top to bottom. The bottom of the inner wall of the upper chamber has a first through hole connecting the first driven gear 26 and the inner wall of the hexagonal socket 22. The top of the transmission section 232 passes through the hexagonal socket 22, the first driven gear 26, and the first through hole sequentially from bottom to top, and is connected to the second driven gear 27. The outer wall of 32 is in contact with and slidably connected to the inner wall of the second driven gear 27. A pressure spring 235 is sleeved on the transmission section 232 located inside the internal hexagonal sleeve 22. The upper and lower ends of the pressure spring 235 abut against the top of the inner wall of the lower chamber and the top of the execution section 233, respectively. A second through hole is provided at the top of the inner wall of the upper chamber for the transmission section 232 to pass through. The outer wall of the execution section 233 is rotatably connected to the inner wall of the internal hexagonal sleeve 22. The bottom end of the execution section 233 is connected to the brake bit 24.

[0023] Furthermore, such as Figure 2 As shown, to prevent the brake bit fixing cylinder from detaching from the gun head, the brake bit fixing cylinder 23 also includes a connecting section 231 located at the top of the transmission section 232. The connecting section 231 extends out of the top of the housing 21 and is threadedly connected to a circular (not shown) limiting block 234. When the pressure spring 235 rebounds, the brake bit fixing cylinder 23 moves downward until the bottom end of the limiting block 234 abuts against the top of the housing 21, at which point the brake bit fixing cylinder 23 stops moving. The top of the housing 21 is integrally provided with a limiting cylinder 211 whose inner wall fits and slides against the outer wall of the circular limiting block 234. During the up-and-down movement of the limiting block 234, the limiting cylinder 211 limits the limiting block 234 laterally.

[0024] Furthermore, such asFigure 2 As shown, the bottom end of the internal hexagonal socket 22 is provided with a connecting groove 221 for connecting the locking nut 4. The inner wall of the connecting groove 221 matches the outer wall of the locking nut 4 and is slidably connected. The connecting groove 221 communicates with the inner wall of the internal hexagonal socket 22.

[0025] Furthermore, such as Figure 2 As shown, in order to prevent the locking nut from disengaging from the actuating end of the internal hexagonal socket, a circular magnet 222 is provided at the top of the inner wall of the connecting groove 221. The circular magnet 222 is used to hold the locking nut in place.

[0026] Furthermore, such as Figure 2 As shown, in order to facilitate the separate control of the start of the servo drive device and the shut-off of the second servo motor, a probe rod 5 is slidably connected inside the brake bit fixing cylinder 23. The top end of the probe rod 5 extends out of the top end of the brake bit fixing cylinder 23 and is equipped with a displacement sensor 51. The bottom end of the probe rod 5 is fixedly connected to the top end of the brake bit 24, and the displacement sensor 51 is connected to an external control unit. When the brake bit 24 is aligned with the inner wall of the piston rod and inserted into the piston rod, the displacement sensor 51 is energized and sends feedback information to the external control unit. The external control unit shuts down the second servo motor 3 and starts the servo drive device 11. The servo drive device 11 drives the internal hexagonal sleeve 22 to tighten the lock nut through the first drive module.

[0027] In this invention, the piston rod of the front air spring assembly of the automobile is energized, and the displacement sensor 51 is electrically connected to the piston rod through the probe rod 5 and the brake bit 24 in sequence.

[0028] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A stepped electric screwdriver, comprising an electric screwdriver body (1) and a screwdriver head (2), wherein a servo drive device (11) is provided at the connecting end of the electric screwdriver body (1), and the screwdriver head (2) comprises a housing (21), an internal hexagonal sleeve (22), a brake bit fixing sleeve (23), and a brake bit (24), wherein the brake bit fixing sleeve (23) and the brake bit (24) are connected in a transmission, and a pressure spring (235) is sleeved on the brake bit fixing sleeve (23), wherein the pressure spring (235) rebounds and contracts with the extension and retraction of the brake bit fixing sleeve (23), characterized in that: A second servo motor (3) is provided on the housing (21). The housing (21) has two chambers, an upper chamber and a lower chamber. A first drive module and a second drive module are respectively provided in the two chambers. The servo drive device (11) and the second servo motor (3) are used to drive the first drive module and the second drive module to operate, respectively. The first drive module and the second drive module are used to drive the internal hexagonal socket (22) and the brake bit fixing cylinder (23) to rotate, respectively. The actuating end of the internal hexagonal socket (22) is used to drive the locking nut to rotate. The brake bit fixing cylinder (23) is rotatably mounted on the internal hexagonal socket (22). Inside, the first drive module includes a first drive gear (25) and a first driven gear (26) meshing with each other on their outer walls. The first drive gear (25) is connected to the execution end of the servo drive device (11) for transmission. The first driven gear (26) is integrally set with the internal hexagonal sleeve (22) and is rotatably connected to the lower cavity. The second drive module includes a second driven gear (27) and a second drive gear (28) meshing with each other on their outer walls. The second driven gear (27) is connected to the brake bit fixing cylinder (23) for transmission. The second drive gear (28) is connected to the execution end of the second servo motor (3) for drive connection.

2. The stepped electric screwdriver according to claim 1, characterized in that: The brake bit fixing cylinder (23) includes a transmission section (232) with a regular hexagonal cross-section and an execution section (233) with a circular cross-section arranged sequentially from top to bottom. The bottom of the inner wall of the upper chamber is provided with a first through hole connecting the first driven gear (26) and the inner wall of the hexagonal sleeve (22). The top of the transmission section (232) passes through the hexagonal sleeve (22), the first driven gear (26) and the first through hole sequentially from bottom to top, and is connected to the second driven gear (27) in a transmission connection. The outer wall of the transmission section (232) is connected to the second driven gear. The inner wall of the wheel (27) is fitted and slidably connected, and a pressure spring (235) is sleeved on the transmission section (232) located inside the internal hexagonal sleeve (22). The upper and lower ends of the pressure spring (235) abut against the top of the inner wall of the lower chamber and the top of the execution section (233), respectively. The top of the inner wall of the upper chamber is provided with a second through hole for the transmission section (232) to pass through. The outer wall of the execution section (233) is rotatably connected to the inner wall of the internal hexagonal sleeve (22). The bottom end of the execution section (233) is connected to the brake bit (24).

3. A stepped electric screwdriver according to claim 2, characterized in that: The brake bit fixing cylinder (23) also includes a connecting section (231) disposed at the top of the transmission section (232). The connecting section (231) extends out of the top of the housing (21) and is threadedly connected to the circular limiting block (234). The top of the housing (21) is integrally provided with a limiting cylinder (211) whose inner wall fits and slides with the outer wall of the circular limiting block (234).

4. A stepped electric screwdriver according to claim 3, characterized in that: The bottom end of the internal hexagonal sleeve (22) is provided with a connecting groove (221) for connecting the locking nut (4), and the connecting groove (221) is in communication with the inner wall of the internal hexagonal sleeve (22).

5. A stepped electric screwdriver according to claim 4, characterized in that: A circular magnet (222) is provided at the top of the inner wall of the connecting groove (221).

6. A stepped electric screwdriver according to any one of claims 3-5, characterized in that: A probe rod (5) is slidably connected inside the brake bit fixing cylinder (23). The top end of the probe rod (5) extends out of the top end of the brake bit fixing cylinder (23). The bottom end of the probe rod (5) is fixedly connected to the top end of the brake bit (24) and is equipped with a displacement sensor (51).

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