Stepped electric screw gun

Abstract

The invention discloses a stepped electric screw gun, and relates to the technical field of electric screw guns, the stepped electric screw gun comprises an electric gun main body and a gun head, the connecting end of the electric gun main body is provided with a servo driving device, the gun head comprises a shell, an inner hexagonal sleeve, a braking screwdriver head fixing cylinder and a braking screwdriver head, and the braking screwdriver head fixing cylinder is in transmission connection with the braking screwdriver head. A second servo motor is arranged on the shell, an upper cavity and a lower cavity are formed in the shell, and a first driving module and a second driving module are arranged in the upper cavity and the lower cavity correspondingly and used for driving the inner hexagonal sleeve and the braking screwdriver head fixing cylinder to rotate correspondingly. According to the quick calibration device, the braking screwdriver head fixing cylinder is driven to rotate at a low speed through the second servo motor and the second driving module, and quick calibration of the braking screwdriver head and the inner wall of the piston rod is achieved.

Description

Technical Field

[0001] This invention patent relates to the technical field of electric screwdrivers, and specifically to a stepped electric screwdriver. Background Art

[0002] In the production of the front air spring assembly of an automobile, an electric screwdriver plays an indispensable role. Driven by an electric current, the electric screwdriver can quickly and continuously complete the tightening operation of screws, thus greatly improving the production efficiency of assembling the front air spring assembly of the automobile. Especially when the shock absorber body and the air spring sub-assembly of the front air spring assembly are assembled together, the electric screwdriver will first move horizontally to the top of the air spring sub-assembly, and ensure that the execution end of the electric screwdriver is centered with the locking nut on the air spring sub-assembly. Then the electric screwdriver moves vertically until the locking nut is inserted into the execution end of the electric screwdriver. The electric screwdriver stops moving and starts the execution end to screw the locking nut. During the screwing process, the electric screwdriver moves downward with the locking nut.

[0003] The execution end of the existing electric screwdriver includes a brake bit for inserting the piston rod and an inner hexagon socket for screwing the locking nut. Before the inner hexagon socket of the electric control screwdriver starts to screw the locking nut, the brake bit must first be inserted into the piston rod, and it is required that the angle of rotation of the piston rod caused by the brake bit before inserting into the piston rod does not exceed 30°. Then the inner hexagon socket can start to screw the locking nut. However, the angle of the brake bit of the existing electric screwdriver is mostly in a fixed mode and cannot meet the above requirements. Therefore, we have invented a stepped electric screwdriver with a rotatable and calibrated brake bit.

[0004] Content of the Invention Patent

[0005] The purpose of this invention patent is to provide a stepped electric screwdriver to solve the problems raised in the above background art.

[0006] To solve the above technical problems, the present invention patent provides the following technical solution: A stepped electric screwdriver, comprising an electric gun main body and a gun head. A servo drive device is provided at the connection end of the electric gun main body. The gun head includes a housing, an internal hexagonal socket, a brake bit fixing cylinder, and a brake bit. The brake bit fixing cylinder is in transmission connection with the brake bit. A pressure spring is sleeved on the brake bit fixing cylinder, and the pressure spring rebounds and contracts as the brake bit fixing cylinder expands and contracts. A second servo motor is provided on the housing. There are two upper and lower chambers inside the housing, and a first drive module and a second drive module are respectively provided in the two chambers. The servo drive device and the second servo motor are respectively used to drive the first drive module and the second drive module to operate. The first drive module and the second drive module are respectively used to drive the internal hexagonal socket and the brake bit fixing cylinder to rotate. The execution end of the internal hexagonal socket is used to drive the locking nut to rotate. The brake bit fixing cylinder is rotatably arranged inside the internal hexagonal socket.

[0007] Further, the first drive module includes a first drive gear and a first driven gear whose outer walls are meshed with each other. The first drive gear is in transmission connection with the execution end of the servo drive device. The first driven gear is integrally provided with the internal hexagonal socket and is rotatably connected to the lower chamber. The second drive module includes a second driven gear and a second drive gear whose outer walls are meshed with each other. The second driven gear is in transmission connection with the brake bit fixing cylinder. The second drive gear is driven and connected to the execution end of the second servo motor.

[0008] Further, the brake bit fixing cylinder includes a transmission section with a regular hexagonal cross-section and an execution section with a circular cross-section, which are arranged in sequence from top to bottom. A first through hole communicating the first driven gear and the inner wall of the internal hexagonal socket is provided at the bottom end of the inner wall of the upper chamber. The top end of the transmission section sequentially passes through the internal hexagonal socket, the first driven gear, and the first through hole from bottom to top and is in transmission connection with the second driven gear. The outer wall of the transmission section is in fit and sliding connection with the inner wall of the second driven gear, and a pressure spring is sleeved on the transmission section located inside the internal hexagonal socket. The upper and lower ends of the pressure spring respectively abut against the top end of the inner wall of the lower chamber and the top end of the execution section. A second through hole for the transmission section to pass through is provided at the top end of the inner wall of the upper chamber. The outer wall of the execution section is rotatably connected to the inner wall of the internal hexagonal socket. The bottom end of the execution section is in transmission connection with the brake bit.

[0009] Further, the brake bit fixing cylinder further includes a connection section provided at the top end of the transmission section. The connection section extends out of the top end of the housing and is threadedly connected to a circular limit block. A limit cylinder whose inner wall is in fit and sliding connection with the outer wall of the circular limit block is integrally provided at the top end of the housing.

[0010] Further, a connection groove for connecting a locking nut is provided at the bottom end of the hexagon socket, and the connection groove communicates with the inner wall of the hexagon socket.

[0011] Further, a circular ring magnet is provided at the top end of the inner wall of the connection groove.

[0012] Further, a detection rod is slidably connected in the brake bit fixing cylinder. The top end of the detection rod extends out of the top end of the brake bit fixing cylinder. The bottom end of the detection rod is fixedly connected to the top end of the brake bit, and a displacement sensor is installed.

[0013] The beneficial effects achieved by this invention patent are as follows:

[0014] 1. By driving the brake bit fixing cylinder to rotate slowly through the second servo motor and the second driving module, rapid calibration of the orientation between the brake bit and the piston rod is achieved, thus avoiding the problem that the piston rod rotates before the brake bit is inserted into the piston rod, and ensuring the stability and reliability of the assembly state.

[0015] 2. Through the dual-drive system design of the servo drive device and the second servo motor, the hexagon socket and the brake bit fixing cylinder can be controlled independently and precisely to meet the requirements of different operation stages, improving the flexibility of operation and the stability of angle relationship control.

[0016] 3. The segmented setting (transmission section and execution section) of the brake bit fixing cylinder and the application of the pressure spring enable the brake bit to have an adaptive telescopic ability during the docking process, effectively coping with the position deviation during the docking process, and improving the stability and reliability of operation.

[0017] 4. Through the setting of the limit block and the limit cylinder, the separation of the brake bit fixing cylinder is effectively prevented, enhancing the safety and durability of the equipment. At the same time, the setting of the circular ring magnet also avoids the separation of the locking nut, further ensuring the continuity of operation.

[0018] 5. Through the cooperation of the displacement sensor and the external control unit, intelligent control of the servo drive device and the second servo motor is achieved. Description of the Drawings

[0019] Figure 1 It is a cross-sectional view of a stepped electric screwdriver in the embodiment;

[0020] Figure 2 It is a cross-sectional view of the gun head in the embodiment;

[0021] Figure 3 It is a cross-sectional view when the brake bit is connected to the piston rod in the embodiment. Detailed Embodiments

[0022] The present invention is further described below in conjunction with the accompanying drawings.

[0023] like Figure 1-2 As shown, the patent of the present invention discloses a stepped electric screw gun, comprising: an electric gun body 1 and a gun head 2, the connection end of the electric gun body 1 is provided with a servo drive device 11, the servo drive device 11 is composed of a first servo motor arranged in the electric gun body 1, a first bevel gear connected to the execution end of the first servo motor, a second bevel gear meshed with the first bevel gear and a transmission rod connected to the bottom end of the second bevel gear, the transmission rod is the execution end of the servo drive device 11, the gun head 2 comprises a housing 21, a hexagon socket 22, a brake screwdriver head fixing cylinder 23 and a brake screwdriver head 24, the brake screwdriver head fixing cylinder 23 and the brake screwdriver head 24 are transmission-connected, and the brake screwdriver head A pressure spring 235 is sleeved on the fixed cylinder 23, and the pressure spring 235 rebounds and contracts with the extension and contraction of the brake bit fixed cylinder 23. A second servo motor 3 is arranged on the shell 21, and two upper and lower chambers are arranged in the shell 21. The first drive module and the second drive module are respectively arranged in the two chambers. The servo drive device 11 and the second servo motor 3 are respectively used to drive the first drive module and the second drive module to operate. The first drive module and the second drive module are respectively used to drive the hexagon socket 22 and the brake bit fixed cylinder 23 to rotate. The execution end of the hexagon socket 22 is used to drive the locking nut to rotate, and the brake bit fixed cylinder 23 is rotatably arranged in the hexagon socket 22.

[0024] Based on the above structure, Figure 1-2 As shown, when the electric screw gun moves vertically downward to dock the locking nut, the brake bit 24 first abuts against the top of the piston rod, and then the electric screw gun moves vertically until the locking nut is inserted into the execution end of the hexagonal socket 22. During this process, since the outer tooth 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 upward and pushes the brake bit fixing cylinder 23 to move upward, and the pressure spring 235 contracts. At this time, the second servo motor 3 is started, and the second servo motor 3 drives the brake bit fixing cylinder 23 to rotate at a low speed through the second drive module, and the brake bit fixing cylinder 23 drives the brake bit 24 to rotate , until the brake bit 24 and the inner wall of the piston rod are calibrated, the pressure spring 235 rebounds, and pushes the brake bit 24 to be inserted into the piston rod, then the second servo motor 3 stops rotating, the servo drive device 11 starts, and drives the hexagon socket 22 to rotate through the first drive module, and the hexagon socket 22 drives the locking nut to be screwed. During the screwing process of the locking nut, the electric screw gun moves vertically with the locking nut. After the screwing of the locking nut is completed, the electric screw gun moves vertically upward to release the connection between the hexagon socket 22 and the locking nut, and at the same time release the connection between the brake bit 24 and the piston rod, waiting for the screwing of the locking nut of the next front air spring assembly of the vehicle.

[0025] Furthermore, as Figure 2 shown, the first driving module includes a first driving gear 25 and a first driven gear 26 with meshing outer walls. The first driving gear 25 is in transmission connection with the execution end of the servo driving device 11. The first driven gear 26 is integrally provided with the hexagon socket 22 and is rotatably connected to the lower cavity. The second driving module includes a second driven gear 27 and a second driving gear 28 with meshing outer walls. The second driven gear 27 is in transmission connection with the brake bit fixing cylinder 23. The second driving gear 28 is drivingly connected to the execution end of the second servo motor 3;

[0026] During use, the servo driving device 11 drives the first driving gear 25 to drive the first driven gear 26 to rotate through meshing, and the first driven gear 26 drives the hexagon socket 22 to rotate;

[0027] The second servo motor 3 drives the second driving gear 28 to drive the second driven gear 27 to rotate through meshing, and the second driven gear 27 drives the brake bit 24 to rotate through the brake bit fixing cylinder 23.

[0028] Furthermore, as Figure 2 shown, the brake bit fixing cylinder 23 includes a transmission section 232 with a regular hexagon cross-section (not shown in the figure) and an execution section 233 with a circular cross-section (not shown in the figure) arranged in sequence from top to bottom. At the bottom end of the inner wall of the upper cavity, there is a first through hole connecting the inner wall of the first driven gear 26 and the hexagon socket 22. The top end of the transmission section 232 passes through the hexagon socket 22, the first driven gear 26, and the first through hole from bottom to top and is in transmission connection with the second driven gear 27. The outer wall of the transmission section 232 is in fit and sliding connection with the inner wall of the second driven gear 27. A pressure spring 235 is sleeved on the transmission section 232 located inside the hexagon socket 22. The upper and lower ends of the pressure spring 235 are respectively abutted against the top end of the inner wall of the lower cavity and the top end of the execution section 233. At the top end of the inner wall of the upper cavity, there is 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 hexagon socket 22. The bottom end of the execution section 233 is in transmission connection with the brake bit 24.

[0029] Furthermore, as Figure 2As shown in the figure, in order to prevent the braking bit fixing cylinder from detaching from the gun head, the braking bit fixing cylinder 23 further includes a connecting section 231 provided at the top end of the transmission section 232. The connecting section 231 extends out of the top end of the housing 21 and is threadedly connected to a circular (not shown in the figure) limiting block 234. When the compression spring 235 rebounds, the braking bit fixing cylinder 23 moves downward until the bottom end of the limiting block 234 abuts against the top end of the housing 21, and the braking bit fixing cylinder 23 stops moving. The top end of the housing 21 is integrally provided with a limiting cylinder 211 whose inner wall fits and is slidably connected to the outer wall of the circular limiting block 234. During the up and down movement of the limiting block 234, the limiting cylinder 211 laterally limits the limiting block 234.

[0030] Further, as Figure 2 shown, a connecting groove 221 for connecting the locking nut 4 is provided at the bottom end of the hexagon socket 22. The inner wall of the connecting groove 221 matches and is slidably connected to the outer wall of the locking nut 4, and the connecting groove 221 communicates with the inner wall of the hexagon socket 22.

[0031] Further, as Figure 2 shown, in order to prevent the locking nut from detaching from the execution end of the hexagon socket, a circular ring magnet 222 is provided at the top end of the inner wall of the connecting groove 221. The circular ring magnet 222 is used to attract and fix the locking nut.

[0032] Further, as Figure 2 shown, in order to facilitate separately controlling the start of the servo drive device and the shutdown of the second servo motor, a detection rod 5 is slidably connected inside the braking bit fixing cylinder 23. The top end of the detection rod 5 extends out of the top end of the braking bit fixing cylinder 23 and is equipped with a displacement sensor 51. The bottom end of the detection rod 5 is fixedly connected to the top end of the braking bit 24. The displacement sensor 51 is signal-connected to an external control unit;

[0033] When the braking bit 24 is calibrated with the inner wall of the piston rod and inserted into the piston rod, the displacement sensor 51 is powered on and feeds back information to the external control unit. The external control unit shuts down the second servo motor 3 and simultaneously starts the servo drive device 11. The servo drive device 11 drives the hexagon socket 22 through the first drive module to screw the locking nut.

[0034] In the present invention, the piston rod of the front air spring assembly of the automobile is electrified, and the displacement sensor 51 is electrically connected to the piston rod through the detection rod 5 and the braking bit 24 in sequence.

[0035] The above is only a preferred specific embodiment of the present invention for the patent, but the protection scope of the present invention for the patent is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention for the patent, according to the technical solution of the present invention for the patent and the inventive concept of the present invention for the patent, makes equivalent replacements or changes, and all should be covered within the protection scope of the present invention for the patent.

Claims

1. A stepped electric screwdriver, comprising an electric gun body (1) and a gun head (2). A servo drive device (11) is provided at the connection end of the electric gun body (1). The gun head (2) includes a housing (21), an internal hexagonal socket (22), a brake bit fixing cylinder (23), and a brake bit (24). The brake bit fixing cylinder (23) and the brake bit (24) are in transmission connection. A pressure spring (235) is sleeved on the brake bit fixing cylinder (23), and the pressure spring (235) rebounds and contracts as the brake bit fixing cylinder (23) expands and contracts. It is characterized in that: The housing (21) is provided with a second servo motor (3). The housing (21) is provided with two upper and lower chambers. The two chambers are provided with a first drive module and a second drive module respectively. The servo drive device (11) and the second servo motor (3) are respectively used to drive the first drive module and the second drive module to operate. The first drive module and the second drive module are respectively used to drive the hexagon socket (22) and the brake bit fixing cylinder (23) to rotate. The execution end of the hexagon socket (22) is used to drive the locking nut to rotate. The brake bit fixing cylinder (23) is rotatably arranged in the hexagon socket (22).

2. The stepped electric screwdriver according to claim 1, characterized in that: The first driving module comprises a first driving gear (25) and a first driven gear (26) whose outer walls are meshed with each other, the first driving gear (25) is drivingly connected to the execution end of the servo driving device (11), the first driven gear (26) is integrally arranged with the hexagon socket (22), and both are rotatably connected to the lower cavity, and the second driving module comprises a second driven gear (27) and a second driving gear (28) whose outer walls are meshed with each other, the second driven gear (27) is drivingly connected to the brake bit fixing cylinder (23), and the second driving gear (28) is drivingly connected to the execution end of the second servo motor (3).

3. The step-type electric screwdriver according to claim 2, characterized in that: The brake bit fixing cylinder (23) comprises a transmission section (232) with a regular hexagonal cross section and an execution section (233) with a circular cross section, which are arranged in sequence 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 passive gear (26) and the inner wall of the inner hexagonal sleeve (22). The top end of the transmission section (232) passes through the inner hexagonal sleeve (22), the first passive gear (26) and the first through hole in sequence from bottom to top, and is transmission-connected to the second passive gear (27). The outer wall of the transmission section (232) is connected to the second passive gear (27). The inner wall of the gear (27) is fitted and slidably connected, and a pressure spring (235) is sleeved on the transmission section (232) located in the inner hexagonal sleeve (22), and the upper and lower ends of the pressure spring (235) are respectively in contact with the top of the inner wall of the lower chamber and the top of the execution section (233), and 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, and the outer wall of the execution section (233) is rotatably connected to the inner wall of the inner hexagonal sleeve (22), and the bottom end of the execution section (233) is transmission-connected to the brake bit (24).

4. The step-type electric screwdriver according to claim 3, wherein: The brake bit fixing cylinder (23) further comprises a connecting section (231) arranged at the top end of the transmission section (232); the connecting section (231) extends out of the top end of the housing (21) and is threadedly connected to a circular stop block (234); and a stop cylinder (211) whose inner wall is in contact with and slidably connected to the outer wall of the circular stop block (234) is integrally provided at the top end of the housing (21).

5. The step-type electric screwdriver according to claim 4, characterized in that: A connecting groove (221) for connecting a locking nut (4) is provided at the bottom end of the hexagon socket sleeve (22), and the connecting groove (221) is communicated with the inner wall of the hexagon socket sleeve (22).

6. The step-type electric screwdriver according to claim 5, wherein: A circular ring magnet (222) is arranged at the top end of the inner wall of the connecting groove (221).

7. A stepped electric screwdriver according to any one of claims 4-6, characterized in that: A detection rod (5) is slidably connected inside the brake bit fixing cylinder (23). The top end of the detection rod (5) extends out of the top end of the brake bit fixing cylinder (23). The bottom end of the detection rod (5) is fixedly connected to the top end of the brake bit (24), and a displacement sensor (51) is installed.

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