A wire pulling mechanism for automatic spot welding equipment

Abstract

The invention discloses a wire pulling mechanism of an automatic spot welding device, which is used for the wire breaking of the welding spot of the spot welding machine, and comprises a fixed seat, a swing arm mechanism and a wire pulling mechanism. The swing arm mechanism is mounted on the fixed seat and can realize movement according to a set trajectory. The wire pulling mechanism is a pendulum part of the swing arm mechanism, which is arranged at the lower end of the swing arm mechanism and moves with the swing arm mechanism. When the spot welding is completed and the welding head is still pressed on the welding spot, the wire pulling mechanism clamps and straightens the tail wire of the welding spot, and then generates a lateral pulling force that can break the tail wire of the welding spot on the clamped and straightened tail wire, so as to realize the wire breaking of the welding spot of the spot welding machine. The mechanism can realize the actions of clamping, straightening, breaking and releasing the tail wire of the welding spot after the spot welding is completed, thereby improving the quality and reliability of welding.

Description

Technical Field

[0001] The invention relates to circuit board or PCB board welding equipment, in particular to a wire pulling mechanism of automatic spot welding equipment. Background Art

[0002] In order to improve the reliability or welding effect of the circuit board or PCB board and the core transformer, the spot welding process of the PCB board welding technology on the market is currently in the traditional semi-manual and semi-machine operation, which requires coordinated work of eyes, feet and hands. The foot pedals are used to control the spot welding head to move up, down, pause and apply force at various speeds. The hands need to be able to move the product very skillfully, and the eyes need to use a microscope to accurately judge whether the wire is pressed on the pad and accurately remember the landing point of the welding head.

[0003] The existing spot welding process has many defects, such as cold soldering, pad detachment and welding residues left on the PCB board, resulting in a high product defect rate. After the spot welding is completed, the existing spot welding machine has a low degree of automation and needs to manually disconnect the tail wire of the solder joint. It requires a high degree of coordination between manpower and equipment to complete, with high labor intensity, high skill requirements, high labor costs, and difficulty in recruiting workers. Therefore, there is an urgent need for a wire pulling mechanism for automatic spot welding equipment to achieve the disconnection of the solder joint of the spot welding machine after the spot welding is completed. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a wire pulling mechanism for automatic spot welding equipment to solve the difficulties and pain points described in the prior art. The mechanism can realize the actions of clamping, straightening, pulling out and releasing the tail wire of the welding spot after the spot welding is completed, thereby improving the quality and reliability of welding.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A wire pulling mechanism of an automatic spot welding device is used for breaking the welding point of a spot welding machine, comprising a fixed seat, a swing arm mechanism and a wire pulling mechanism. The swing arm mechanism is mounted on the fixed seat and can realize movement according to a set trajectory. The wire pulling mechanism, as a pendulum part of the swing arm mechanism, is arranged at the lower end of the swing arm mechanism and moves with the swing arm mechanism. The movement trajectory of the swing arm mechanism includes a first movement trajectory and a second movement trajectory. When the spot welding is completed and the welding head is still pressed on the welding point, the wire pulling mechanism follows the swing arm mechanism from the first movement trajectory to break the welding point of the spot welding machine, that is, the wire pulling mechanism clamps and straightens the tail wire of the welding point, and generates a lateral pulling force on the clamped and straightened tail wire that can break the tail wire of the welding point. Subsequently, the wire pulling mechanism follows the swing arm mechanism from the second movement trajectory to complete the breaking of the welding point of the spot welding machine, that is, the wire is broken first and then the wire pulling mechanism rises to achieve the breaking of the welding point of the spot welding machine.

[0007] Preferably, the swing arm mechanism is a U-shaped motion trajectory opening downward, the first motion trajectory is from the U-shaped apex to the U-shaped bottom point, and the second motion trajectory is from the U-shaped bottom point to the U-shaped apex.

[0008] Preferably, the swing arm mechanism includes a base plate 5, a U-shaped plate 6, a sliding bearing 9, a pendulum 10, a guide rail connecting block 11 and a cross guide 12. The lower end of the base plate 5 is connected to the fixed seat with a fastening screw, the front end of the base plate 5 and the cross guide 12 are connected with a fastening screw, the guide rail connecting block 11 is used to connect the sliding bearing 9 and the cross guide 12, the rear end of the base plate 5 is connected to the U-shaped plate 6 with a fastening screw, a U-shaped groove is opened on the U-shaped plate 6, the pendulum 10 is connected to the sliding bearing 9, and the U-shaped groove rolls with the sliding bearing 9 and the pendulum 10 to realize the U-shaped motion trajectory of the swing arm mechanism.

[0009] Preferably, the fixed seat includes a front and rear adjustment plate 1, a positioning pin 2, a left and right adjustment plate 3 and a supporting square column 4. The front and rear adjustment plate 1 is positioned with the fixed platform by the positioning pin 2. The front and rear adjustment plate 1 is provided with a guide groove to install the left and right adjustment plate 3 for left and right adjustment. The left and right adjustment plate 3 is provided with a rectangular groove to install the supporting square column 4.

[0010] Preferably, the wire pulling mechanism comprises a wire clamping unit, a tensioning unit and a wire pulling unit, the wire clamping unit is used to clamp the solder joint tail wire, the tensioning unit is used to straighten the solder joint tail wire, and the wire pulling mechanism is used to generate a lateral pulling force that can break the solder joint tail wire to break the solder joint tail wire.

[0011] Preferably, the wire clamping unit comprises a wire clamping finger 27, a wire clamping finger connecting block 26 and a wire clamping cylinder 28, the wire clamping finger connecting block 26 connects the wire clamping cylinder 28 and the wire clamping finger 27, and the wire clamping cylinder 28 is used to drive the wire clamping finger 27 to clamp and release.

[0012] Preferably, the tensioning unit includes an air gripper fixing block 18, a linear guide 19, a spring block 20, a panel cylinder connecting block 21, a panel cylinder 22, a compression spring 24 and a guide rail base plate 25. The compression spring 24 and the air gripper fixing block 18 form a reset mechanism and are connected to the guide rail base plate 25 through the spring block 20. The linear guide 19 is respectively connected to the lower end of the air gripper fixing block 18 and the upper end of the guide rail base plate 25. The front end of the guide rail base plate 25 is connected to the wire clamping unit, and the rear end of the guide rail base plate 25 is connected to the panel cylinder 22 through the panel cylinder connecting block 21. The panel cylinder 22 pushes the air gripper fixing block 18 to move along the linear guide 19, and the compression spring 24 is compressed. When atmospheric pressure is passed through, the compression spring 24 resets and pushes the air gripper fixing block 18 with the wire clamping unit to move backward to realize the tensioning action of the tensioning unit.

[0013] Preferably, the wire pulling unit includes a cylinder connecting block 13, a wire pulling cylinder 14 and an adapter plate 15. The upper end of the wire pulling cylinder 14 is connected to the swing arm mechanism through the cylinder connecting block 13, and the lower end of the wire pulling cylinder 14 is connected to the guide rail bottom plate 25 through the adapter plate 15. The wire pulling cylinder 14 is used to provide a lateral pulling force to pull off the tail wire of the welding point.

[0014] The wire pulling mechanism of the wire pulling mechanism of the automatic spot welding equipment of the present invention is composed of a wire clamping unit, a tensioning unit and a wire pulling unit. The clamping mechanism is used to clamp the tail wire of the welding spot, the tensioning mechanism uses a flexible force to straighten the tail wire of the welding spot (the compression spring is clamped by the spring force when it is reset), and the horizontal wire pulling mechanism uses a rigid force to pull and break the tail wire of the welding spot. Wire pulling action: the spot welding head steps on the wire - the spot welding machine discharges - the wire pulling mechanism moves along the first motion trajectory - the wire pulling mechanism clamps the tail wire, tightens the tail wire, and breaks the wire horizontally - the wire pulling mechanism moves along the second motion trajectory - the welding wire is broken.

[0015] The beneficial effects of the present invention are:

[0016] 1. The present invention does not require workers to use their eyes to judge whether the wire is pressed on the pad, and does not require them to use their hands to move the product, thus freeing workers' eyes and hands, greatly reducing labor intensity and skill requirements, reducing labor costs, and solving the problem of difficulty in recruiting people;

[0017] 2. The present invention adds a horizontal wire pulling action, optimizes the wire breaking effect, and effectively improves the welding quality;

[0018] 3. The present invention has the following effects during the spot welding head stepping on the wire and discharging process: ① first break the wire, and then the wire pulling mechanism rises to ensure that the break point is on the wire clamping side of the pad; ② first tighten the tail wire, and then break the wire horizontally to ensure that the wire pulling stress is concentrated in the direction along the wire, and will not act in the vertical direction of the pad, thereby reducing the risk of the pad falling off and increasing the reliability of welding quality;

[0019] 4. The tensioning action of the present invention is reset by a spring, which is a flexible force and has a tensioning and positioning effect without damaging the wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A three-dimensional diagram of a wire pulling mechanism of the automatic spot welding device of the present invention;

[0021] Figure 2 A three-dimensional diagram of a fixing seat of a wire pulling mechanism of an automatic spot welding device of the present invention;

[0022] Figure 3 A three-dimensional diagram of a swing arm mechanism of a wire pulling mechanism of an automatic spot welding device of the present invention;

[0023] Figure 4 It is an assembly diagram of the wire clamping, tensioning and wire pulling units of the wire pulling mechanism of the automatic spot welding equipment of the present invention;

[0024] Figure 5 It is an assembly diagram of the wire clamping and tensioning unit of the wire pulling mechanism of the automatic spot welding equipment of the present invention;

[0025] Figure 6 It is a spot welding schematic diagram of the wire pulling mechanism of the automatic spot welding equipment of the present invention;

[0026] Figure 7 A schematic diagram of a spot welding wire breakage of a wire pulling mechanism of an automatic spot welding device of the present invention;

[0027] Names of the reference numerals in the accompanying drawings: 1. front and rear adjustment plates; 2. positioning pins; 3. left and right adjustment plates; 4. supporting square columns; 5. base plate; 6. U-shaped plate; 7. motor seat; 8. motor; 9. sliding bearing; 10. ornament; 11. guide rail connecting block; 12. cross guide; 13. cylinder connecting block; 14. wire pulling cylinder; 15. adapter plate; 16. front limit block; 17. rear limit block; 18. air claw fixing block; 19. linear guide; 20. spring block; 21. panel cylinder connecting block; 22. panel cylinder; 23. adjusting screw; 24. compression spring; 25. guide rail base plate; 26. finger connecting block; 27. wire clamping finger; 28. wire clamping cylinder. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0029] Figure 1 The present invention is a stereoscopic diagram of the wire pulling mechanism of the automatic spot welding device, which is installed on a frame. The wire pulling mechanism of the automatic spot welding device includes a fixed seat, a swing arm mechanism and a wire pulling mechanism. The swing arm mechanism is mounted on the fixed seat and can move according to a set trajectory. The wire pulling mechanism is a pendulum part of the swing arm mechanism, which is arranged at the lower end of the swing arm mechanism and moves with the swing arm mechanism. When the spot welding is completed and the welding head is still pressed on the welding spot, the wire pulling mechanism clamps and straightens the tail wire of the welding spot, and then generates a lateral pulling force on the clamped and straightened tail wire that can pull out the tail wire of the welding spot, so as to achieve the welding spot wire breaking of the spot welding machine.

[0030] The motion trajectory of the swing arm mechanism includes a first motion trajectory and a second motion trajectory. The wire pulling mechanism follows the swing arm mechanism from the first motion trajectory to disconnect the welding point of the spot welding machine, and the wire pulling mechanism follows the swing arm mechanism from the second motion trajectory to complete the welding point disconnection of the spot welding machine. Specifically, it is a U-shaped motion trajectory with an opening downward, the first motion trajectory is from the U-shaped vertex to the U-shaped bottom point, and the second motion trajectory is from the U-shaped bottom point to the U-shaped vertex.

[0031] Figure 2The present invention is a stereoscopic diagram of a fixing seat of a wire pulling mechanism of an automatic spot welding device, which is composed of a front and rear adjustment plate 1, a left and right adjustment plate 3, two positioning pins 2, two supporting square columns 4 and a number of fixing screws. The front and rear adjustment plate 1 is connected to the frame with fastening screws and positioned with positioning pins 2. A guide groove is provided on the front and rear adjustment plate 1 to install the left and right adjustment plates 3. The left and right adjustment plates 3 are connected to the front and rear adjustment plates 1 with fastening screws. A rectangular groove is provided on the left and right adjustment plates 3 to install the supporting square column 4. The supporting square column 4 is connected to the left and right adjustment plates 3 with fastening screws. The left and right adjustment plates 3 adjust the left and right displacement of the wire pulling mechanism, and the front and rear adjustment plates 1 adjust the front and rear displacement of the wire pulling mechanism. The fixing seat can realize fine-tuning of the position of the wire pulling mechanism on the frame.

[0032] Figure 3 The present invention is a stereoscopic diagram of the swing arm mechanism of the wire pulling mechanism of the automatic spot welding device, which consists of a base plate 5, a U-shaped plate 6, a motor seat 7, a motor 8, three sliding bearings 9, a pendulum 10, a guide rail connection block 11, a cross guide 12 and a number of fixing screws. The supporting square column 4 is connected to the lower end of the base plate 5 with a fastening screw, and a square groove is opened on the upper side of the supporting square column 4 for positioning and bearing the base plate 5. The front end of the base plate 5 and the cross guide 12 are connected with fastening screws, and the guide rail connection block 11 is used to connect the sliding bearing 9 and the cross guide 12. The rear end of the base plate 5 is respectively connected to the motor seat 7 and the U-shaped plate 6 with fastening screws. The U-shaped plate 6 is provided with a U-shaped groove, and the motor seat 7 is connected and fixed with the motor 8. The U-shaped groove is in rolling cooperation with the sliding bearing 9 and the pendulum 10. The pendulum 10 is used to connect the motor 8 and the sliding bearing 9. The above parts are in a combined relationship and are combined into a swing arm mechanism to achieve the required swing arm U-shaped trajectory and complete the tail line release action.

[0033] The wire pulling mechanism of the present invention comprises a wire clamping unit, a tensioning unit and a wire pulling unit. The wire clamping unit is used for clamping the soldering point tail wire, the tensioning unit is used for straightening the soldering point tail wire, and the wire pulling mechanism is used for generating a lateral pulling force capable of pulling off the soldering point tail wire to pull off the soldering point tail wire.

[0034] Figure 4 This is an assembly diagram of the wire clamping, tensioning and wire pulling units of the wire pulling mechanism of the automatic spot welding equipment of the present invention. Figure 5 The present invention is an assembly diagram of the wire clamping and tensioning units of the wire pulling mechanism of the automatic spot welding equipment.

[0035] The wire pulling unit consists of a cylinder connecting block 13, a wire pulling cylinder 14, and an adapter plate 15. The tensioning unit consists of two air claw fixing blocks 18, two linear guides 19, two spring blocks 20, two panel cylinder connecting blocks 21, two panel cylinders 22, two adjusting screws 23, two compression springs 24, and two guide rail base plates 25. The wire clamping unit consists of four wire clamping fingers 27, four wire clamping finger connecting blocks 26, two wire clamping cylinders 28 and a number of screws.

[0036] The upper end of the wire pulling cylinder 14 is connected to the cross guide 12 of the swing arm mechanism through the cylinder connecting block 13, and the lower end of the wire pulling cylinder 14 is connected to the guide rail bottom plate 25 through the adapter plate 15. The wire pulling unit of the present invention provides a horizontal wire pulling action; the compression spring 24, the adjusting screw and the air claw fixing block 18 form a reset mechanism connected to the guide rail bottom plate 25 through the spring block 20, the linear guide 19 is respectively connected to the lower end of the air claw fixing block 18 and the upper end of the guide rail bottom plate 25, the front end of the guide rail bottom plate 25 is connected to the wire clamping finger connecting block 26 of the wire clamping unit, and the rear end of the guide rail bottom plate 25 is connected to the panel cylinder connecting block 21 It is connected to the panel cylinder 22; when the panel cylinder 22 is ventilated, the push rod presses the air claw fixing block 18 and moves along the linear guide 19, and the compression spring 24 is compressed. When the atmospheric pressure is ventilated, the push rod retreats, and the compression spring 24 resets to push the air claw fixing block 18 with the wire clamping unit backward. The tensioning force of the tensioning unit can be adjusted by rotating the adjusting screw 23. The tensioning unit of the present invention is tightened by flexible force to complete the action of tensioning the wire; the wire clamping finger connecting block 26 connects the wire clamping cylinder 28 and the wire clamping finger 27. The wire clamping cylinder 28 is used to drive the wire clamping finger 27 to clamp the welding point tail wire to complete the wire clamping action.

[0037] The wire pulling action of the present invention is as follows: the spot welding head steps on the wire - the spot welding machine discharges - the wire pulling mechanism moves along the first motion trajectory - the wire pulling mechanism clamps the tail wire, tightens the tail wire, and breaks the wire horizontally - the wire pulling mechanism moves along the second motion trajectory - the welding wire is broken. The present invention has a horizontal wire pulling action during the spot welding head stepping on the wire and discharging process: the wire is broken first, and then the wire pulling mechanism rises to ensure that the breakpoint is on the wire clamping side of the pad; the tail wire is tightened first, and then the wire is broken horizontally to ensure that the wire pulling stress is concentrated in the direction along the line and will not act in the vertical direction of the pad, thereby reducing the risk of the pad falling off and increasing the reliability of the welding quality. Figure 6 The spot welding schematic diagram of the wire pulling mechanism of the automatic spot welding equipment of the present invention is shown in FIG. Figure 7 The figure is a schematic diagram of spot welding wire breaking of the wire pulling mechanism of the automatic spot welding equipment of the present invention, which helps to understand the wire pulling action design of the present invention.

[0038] The above description is only used to help understand the method and core idea of ​​the present invention. For ordinary technicians in this technical field, without departing from the principles of the present invention, other equivalent application schemes that can be naturally associated with the above description and examples, as well as several improvements and modifications to the present invention, all fall within the scope of protection of the claims of the present invention.

Claims

1. A wire pulling mechanism for automatic spot welding equipment, used for breaking the welding point of the spot welding machine, Features: The invention comprises a fixed seat, a swing arm mechanism and a wire pulling mechanism. The swing arm mechanism is mounted on the fixed seat and can realize movement according to a set trajectory. The wire pulling mechanism, as a pendulum part of the swing arm mechanism, is arranged at the lower end of the swing arm mechanism and moves with the swing arm mechanism. The movement trajectory of the swing arm mechanism comprises a first movement trajectory and a second movement trajectory. When the spot welding is completed and the welding head is still pressed on the welding spot, the wire pulling mechanism follows the swing arm mechanism from the first movement trajectory to break the welding spot of the spot welding machine, that is, the wire pulling mechanism clamps and straightens the welding spot tail wire, and generates a lateral pulling force on the clamped and straightened tail wire that can break the welding spot tail wire. Subsequently, the wire pulling mechanism follows the swing arm mechanism from the second movement trajectory to complete the welding spot breaking of the spot welding machine, that is, the wire is broken first and then the wire pulling mechanism rises to realize the welding spot breaking of the spot welding machine. Specifically, the wire pulling action that can be formed is: the spot welding head steps on the wire - the spot welding machine discharges - the wire pulling mechanism moves along the first movement trajectory - the wire pulling mechanism clamps the tail wire, tightens the tail wire, and breaks the wire horizontally - the wire pulling mechanism moves along the second movement trajectory - the welding wire breaking is completed.

2. The wire pulling mechanism of the automatic spot welding equipment according to claim 1, Features: The swing arm mechanism is a U-shaped motion track opening downward, the first motion track is from the U-shaped top point to the U-shaped bottom point, and the second motion track is from the U-shaped bottom point to the U-shaped top point.

3. The wire pulling mechanism of the automatic spot welding equipment according to claim 2, Features: The swing arm mechanism comprises a base plate (5), a U-shaped plate (6), a sliding bearing (9), a swing piece (10), a guide rail connecting block (11) and a cross guide rail (12); the lower end of the base plate (5) is connected to a fixing seat by a fastening screw; the front end of the base plate (5) and the cross guide rail (12) are connected by a fastening screw; the guide rail connecting block (11) is used to connect the sliding bearing (9) and the cross guide rail (12); the rear end of the base plate (5) and the U-shaped plate (6) are connected by a fastening screw; a U-shaped groove is provided on the U-shaped plate (6); the swing piece (10) is connected to the sliding bearing (9); the U-shaped groove, the sliding bearing (9) and the swing piece (10) are rollingly matched to realize a U-shaped motion track of the swing arm mechanism.

4. The wire pulling mechanism of the automatic spot welding equipment according to claim 1, Features: The fixing seat comprises a front and rear adjustment plate (1), a positioning pin (2), a left and right adjustment plate (3) and a supporting square column (4); the front and rear adjustment plate (1) and the fixing platform are positioned by the positioning pin (2); the front and rear adjustment plate (1) is provided with a guide groove for mounting the left and right adjustment plate (3) for left and right adjustment; and the left and right adjustment plate (3) is provided with a rectangular groove for mounting the supporting square column (4).

5. The wire pulling mechanism of the automatic spot welding equipment according to claim 1, Features: The wire pulling mechanism includes a wire clamping unit, a tensioning unit and a wire pulling unit. The wire clamping unit is used to clamp the solder joint tail wire, the tensioning unit is used to straighten the solder joint tail wire, and the wire pulling mechanism is used to generate a lateral pulling force that can pull off the solder joint tail wire to pull off the solder joint tail wire.

6. The wire pulling mechanism of the automatic spot welding equipment according to claim 5, Features: The wire clamping unit comprises a wire clamping finger (27), a wire clamping finger connecting block (26) and a wire clamping cylinder (28); the wire clamping finger connecting block (26) connects the wire clamping cylinder (28) and the wire clamping finger (27); and the wire clamping cylinder (28) is used to drive the wire clamping finger (27) to clamp and release.

7. The wire pulling mechanism of the automatic spot welding equipment according to claim 5, Features: The tensioning unit comprises an air gripper fixing block (18), a linear guide rail (19), a spring block (20), a panel cylinder connecting block (21), a panel cylinder (22), a compression spring (24) and a guide rail base plate (25); the compression spring (24) and the air gripper fixing block (18) form a reset mechanism connected to the guide rail base plate (25) via the spring block (20); the linear guide rail (19) is respectively connected to the lower end of the air gripper fixing block (18) and the upper end of the guide rail base plate (25); the front end of the guide rail base plate (25) is connected to the clamping unit; the rear end of the guide rail base plate (25) is connected to the panel cylinder (22) via the panel cylinder connecting block (21); the panel cylinder (22) presses against the air gripper fixing block (18) and moves along the linear guide rail (19); the compression spring (24) is compressed; when atmospheric pressure is released, the compression spring (24) is reset to press against the air gripper fixing block (18) with the clamping unit and move backward, thereby realizing the tensioning action of the tensioning unit.

8. The wire pulling mechanism of the automatic spot welding equipment according to claim 5, Features: The wire pulling unit comprises a cylinder connection block (13), a wire pulling cylinder (14) and an adapter plate (15); the upper end of the wire pulling cylinder (14) is connected to the swing arm mechanism via the cylinder connection block (13); the lower end of the wire pulling cylinder (14) is connected to the guide rail bottom plate (25) via the adapter plate (15); the wire pulling cylinder (14) is used to provide a lateral pulling force to pull off the tail wire of the welding point.

Images