Servo compression resistance welding mechanism

Abstract

The utility model particularly relates to a servo pressing resistance welding mechanism which comprises a bottom plate, a control module, a resistance welding assembly for conducting discharge welding on a piece to be welded, a floating pressure measuring assembly for applying pre-pressure to the piece to be welded and a driving assembly for driving the resistance welding assembly and the floating pressure measuring assembly to ascend and descend. The pressure sensor is arranged in the floating mounting groove, located below the pressure block and used for measuring the welding pressure in real time, the control module is electrically connected with the pressure sensor and the servo motor, the pressure sensor transmits the welding pressure value to the control module, and when the welding pressure value does not meet the welding requirement, the servo motor stops working. According to the structure, the precise working position and working pressure of the resistance welding assembly can be achieved, the welding duration is shortened by providing pre-pressure before welding through the pre-pressing elastic piece, the welding real-time pressure is monitored through the pressure sensor, the automation degree is high, and the yield is high.

Description

Technical Field

[0001] The utility model relates to the technical field of resistance welding, in particular to a servo pressing resistance welding mechanism. Background Art

[0002] Resistance welding uses the resistance heat generated by an electric current passing through the weldment and the contact points as a heat source to locally heat the weldment, while simultaneously applying pressure to weld. This method requires no filler metal, resulting in high productivity, minimal weld deformation, and ease of automation.

[0003] In traditional resistance welding, different materials require different welding parameters. However, when the welding clamp is powered by a cylinder, it is often necessary to gradually verify the welding effect by adjusting the air pressure without knowing the actual pressure value. In addition, due to the unstable factors of air pressure, it is easy to cause the welding defect rate to be too high, and it cannot adapt to the welding of materials of different thicknesses. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and to provide a servo compression resistance welding mechanism.

[0005] The technical solution adopted by the utility model is as follows: a servo-compression resistance welding mechanism, comprising a base plate, a control module, a resistance welding assembly for performing discharge welding on a workpiece, a floating pressure measuring assembly for applying pre-pressure to the workpiece, and a driving assembly for driving the resistance welding assembly and the floating pressure measuring assembly to rise and fall.

[0006] The drive assembly includes a servo motor and a transmission screw. The servo motor is mounted on a base plate. One end of the transmission screw is connected to the driving end of the servo motor, and the other end or a middle position is connected to an adapter plate. A support seat is fixed on the adapter plate, and a resistance welding assembly is connected to the lower end of the support seat.

[0007] The upper end of the support seat is provided with a floating mounting groove, and the adapter plate is connected to the elastic member positioning plate above the support seat. The floating pressure measuring assembly includes a pre-loaded elastic member, a pressure block, and a pressure sensor.

[0008] The pre-compression elastic member is located between the elastic member positioning plate and the floating installation groove, and its lower end is connected to the pressure block. The pressure sensor is arranged in the floating installation groove and below the pressure block for real-time measurement of welding pressure.

[0009] The control module is electrically connected to the pressure sensor and the servo motor respectively. The pressure sensor transmits the welding pressure value to the control module. When the welding pressure value does not meet the welding requirements, the servo motor stops working.

[0010] Preferably, at least one in-position sensor is provided on one side of the base plate along the Z-axis direction, and a sensing sheet that cooperates with the in-position sensor is correspondingly provided on one side of the adapter plate, and the in-position sensor is electrically connected to the control module.

[0011] Preferably, a sensor mounting bar extending along the Z-axis direction is provided on one side of the base plate, and the in-position sensor is a slot-type photoelectric switch installed on the sensor mounting bar.

[0012] Preferably, a movable linear guide rail extending along the Z-axis direction is provided on one side of the base plate corresponding to the adapter plate, and a guide block is provided on the side of the adapter plate close to the base plate, and the guide block is correspondingly provided with a first sliding groove that is adapted to the shape of the movable linear guide rail and forms an insertable and sliding fit.

[0013] Preferably, two movable linear guide rails are provided in parallel and are located near the two ends of the adapter plate in the horizontal direction, and each movable linear guide rail is correspondingly equipped with at least two guide blocks distributed along the Z-axis direction.

[0014] Preferably, the base plate is connected to an upper limit block and a lower limit block at the upper and lower ends of the movable linear guide rail on one side corresponding to the adapter plate, and the lower end of the upper limit block and the upper end of the lower limit block are connected to an upper buffer pad and a lower buffer pad corresponding to the upper / lower end of the adapter plate.

[0015] Preferably, the adapter plate is provided with a preload linear guide rail extending along the Z-axis direction on one side corresponding to the floating pressure measuring assembly, and the elastic member positioning plate and the support seat are correspondingly provided with a second slide groove adapted to the shape of the preload linear guide rail and forming an inserting and sliding fit.

[0016] Preferably, a buffer fitting portion is extended to both sides of the upper end of the support seat, and a buffer support block extending toward the support seat is provided below the buffer fitting portion on one side of the adapter plate corresponding to the support seat, and the buffer support block is passed through and fixed with a buffer part along the Z-axis direction, the upper end of which is against the lower end of the buffer fitting portion.

[0017] Preferably, the lower end of the support seat is connected to an insulating plate, the bottom of the insulating plate is connected to an electrode mounting plate, and the resistance welding assembly includes an electrode assembly connected to the electrode mounting plate.

[0018] Preferably, one end of the transmission screw is connected to the driving end of the servo motor through a coupling.

[0019] The beneficial effects of the present invention are as follows: the transmission screw converts the circumferential power of the servo motor into linear motion, driving the resistance welding assembly and the floating pressure measuring assembly to rise and fall, thereby realizing the precise working position and working pressure of the resistance welding assembly, shortening the welding time by providing pre-pressure before welding through the pre-stressed elastic part, monitoring the real-time welding pressure through the pressure sensor, and shutting down when the pressure value does not meet the welding requirements, so that the device can adapt to the welding of materials of different thicknesses, with a high degree of automation and a high yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still fall within the scope of the present invention.

[0021] Figure 1 This is a three-dimensional structural diagram of an embodiment of the utility model;

[0022] Figure 2 This is a front view structural diagram of an embodiment of the utility model;

[0023] Figure 3 This is a side structural diagram of an embodiment of the utility model;

[0024] Figure 4 This is a top view of the structure of an embodiment of the utility model;

[0025] Figure 5 for Figure 4 Cross-section at AA;

[0026] Figure 6 for Figure 5 A magnified view of the structure at point B in the middle;

[0027] In the figure, 1. base plate; 6. coupling; 11. movable linear guide; 12. upper limit block; 13. lower limit block; 14. sensor mounting strip; 21. servo motor; 22. transmission screw; 23. adapter plate; 24. support seat; 31. preload elastic member; 32. pressure block; 33. pressure sensor; 41. in-position sensor; 51. insulating plate; 52. electrode mounting plate; 53. electrode assembly; 121. upper buffer pad; 131. lower buffer pad; 230. elastic member positioning plate; 231. guide block; 232. first slide groove; 233. preload linear guide; 234. second slide groove; 235. buffer support block; 236. buffer member; 241. floating mounting groove; 242. buffer fitting part. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings.

[0029] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two non-identical entities or non-identical parameters with the same name. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. Subsequent embodiments will not explain this one by one.

[0030] The directional and positional terms used in this invention, such as "upper," "lower," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are used solely to refer to the directions or positions in the accompanying drawings. Therefore, the directional and positional terms used are intended to illustrate and facilitate understanding of this invention and are not intended to limit the scope of protection of this invention.

[0031] like Figures 1 to 6 As shown in the figure, a servo-compression resistance welding mechanism in an embodiment of the present invention includes a base plate 1, a control module, a resistance welding assembly for performing discharge welding on a workpiece, a floating pressure measuring assembly for applying pre-pressure to the workpiece, and a driving assembly for driving the resistance welding assembly and the floating pressure measuring assembly to rise and fall.

[0032] The drive assembly includes a servo motor 21 and a transmission screw 22. The servo motor 21 is mounted on the base plate 1. One end of the transmission screw 22 is connected to the driving end of the servo motor 21, and the other end or a middle position is connected to an adapter plate 23. A support base 24 is fixed on the adapter plate 23. The lower end of the support base 24 is connected to a resistance welding assembly.

[0033] The upper end of the support seat 24 is provided with a floating mounting groove 241, and the adapter plate 23 is connected to the elastic member positioning plate 230 above the support seat 24. The floating pressure measuring assembly includes a pre-load elastic member 31, a pressure block 32, and a pressure sensor 33.

[0034] The pre-compression elastic member 31 is located between the elastic member positioning plate 230 and the floating installation groove 241, and its lower end is connected to the pressure block 32. The pressure sensor 33 is arranged in the floating installation groove 241 and below the pressure block 32 for real-time measurement of welding pressure.

[0035] The control module is electrically connected to the pressure sensor 33 and the servo motor 21 respectively. The pressure sensor 33 transmits the welding pressure value to the control module. When the welding pressure value does not meet the welding requirement, the servo motor 21 stops working.

[0036] Through this setting, the transmission screw converts the circumferential power of the servo motor into linear motion, driving the resistance welding assembly and the floating pressure measuring assembly to rise and fall, thereby achieving the precise working position and working pressure of the resistance welding assembly. The pre-stressing elastic part provides pre-pressure before welding to shorten the welding time, and the real-time welding pressure is monitored by the pressure sensor. When the pressure value does not meet the welding requirements, the device is shut down, making it able to adapt to the welding of materials of different thicknesses, with a high degree of automation and a high yield rate.

[0037] In this embodiment, the control module is also connected to an alarm unit, which shuts down and alarms when the pressure value does not meet the welding requirements, reminding the staff to make adjustments; the pressure sensor is specifically a miniature planar pressure sensor, which is used to measure and feedback real-time pressure. At the same time, it has a simple structure and is reliable to use. The control module can specifically adopt a PLC controller, and its coordination with the pressure sensor and servo motor is an existing conventional technical means, which will not be elaborated here.

[0038] At least one in-position sensor 41 is provided on one side of the base plate 1 along the Z-axis direction, and a sensing piece 42 that cooperates with the in-position sensor 41 is correspondingly provided on one side of the adapter plate 23. The in-position sensor 41 is electrically connected to the control module.

[0039] Through this setting, the position of the adapter plate can be detected, thereby detecting the position of the resistance welding assembly connected thereto, ensuring that the resistance welding assembly is accurately in place.

[0040] A sensor mounting bar 14 extending along the Z-axis direction is provided on one side of the base plate 1 , and the in-position sensor 41 is a slot-type photoelectric switch mounted on the sensor mounting bar 14 .

[0041] The slot-type photoelectric switch is a contactless detection switch that is less restricted by the detection object and can be flexibly used in welding scenarios.

[0042] The base plate 1 is provided with a movable linear guide rail 11 extending along the Z-axis direction on one side corresponding to the adapter plate 23, and a guide block 231 is provided on the side of the adapter plate 23 close to the base plate 1. The guide block 231 is correspondingly provided with a first sliding groove 232 that is adapted to the shape of the movable linear guide rail 11 and forms an inserting and sliding fit.

[0043] With this arrangement, the accuracy of the vertical movement of the resistance welding assembly is ensured by the cooperation between the movable linear guide rail and the first slide groove.

[0044] The movable linear guide rails 11 are provided in two parallel directions and are located near the two ends of the adapter plate 23 in the horizontal direction. Each movable linear guide rail 11 is correspondingly matched with at least two guide blocks 231 distributed along the Z-axis direction.

[0045] This arrangement further improves the accuracy of the vertical movement of the resistance welding assembly.

[0046] The base plate 1 is connected to an upper limit block 12 and a lower limit block 13 at the upper and lower ends of the movable linear guide rail 11 on one side corresponding to the adapter plate 23, and the lower end of the upper limit block 12 and the upper end of the lower limit block 13 are connected to an upper buffer pad 121 and a lower buffer pad 131 corresponding to the upper / lower end of the adapter plate 23.

[0047] This arrangement can prevent the adapter plate and the resistance welding assembly from moving away from the moving linear guide rail, while the upper and lower buffer pads can prevent the upper and lower limit blocks from colliding with the adapter plate and affecting the connecting elements thereon.

[0048] The adapter plate 23 is provided with a preload linear guide rail 233 extending along the Z-axis direction on one side corresponding to the floating pressure measuring assembly, and the elastic member positioning plate 230 and the support seat 24 are correspondingly provided with a second slide groove 234 that is adapted to the shape of the preload linear guide rail 233 and forms an inserting and sliding fit.

[0049] Through this setting, the preloaded linear guide rail can ensure the stability of the support seat movement, thereby ensuring the stability of the expansion and contraction of the preloaded elastic member, making the pressure measurement value of the pressure sensor more accurate, the welding pressure error smaller, and the welding effect better.

[0050] A buffer fitting portion 242 extends from the upper end of the support seat 24 to both sides. A buffer support block 235 extending toward the support seat 24 is provided on one side of the adapter plate 23 corresponding to the support seat 24 below the buffer fitting portion 242. The buffer support block 235 is penetrated and fixed with a buffer part 236 along the Z-axis direction, the upper end of which is against the lower end of the buffer fitting portion 242.

[0051] In this embodiment, the buffer member is specifically a buffer, which mainly plays a role of buffering and shock absorption, so that the lifting and moving operation of the support seat is more stable and the pressure measurement value of the pressure sensor is more accurate.

[0052] An insulating plate 51 is connected to the lower end of the support base 24 , and an electrode mounting plate 52 is connected to the bottom of the insulating plate 51 . The resistance welding assembly includes an electrode assembly 53 connected to the electrode mounting plate 52 .

[0053] One end of the transmission screw 22 is connected to the driving end of the servo motor 21 through a coupling 6 .

[0054] Those skilled in the art will understand that all or part of the steps in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a program, and the program can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc.

[0055] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A servo-compression resistance welding mechanism, characterized in that: It comprises a base plate (1), a control module, a resistance welding assembly for performing discharge welding on a workpiece to be welded, a floating pressure measuring assembly for applying pre-pressure to the workpiece to be welded, and a driving assembly for driving the resistance welding assembly and the floating pressure measuring assembly to rise and fall. The driving assembly includes a servo motor (21) and a transmission screw (22), wherein the servo motor (21) is mounted on the base plate (1), one end of the transmission screw (22) is connected to the driving end of the servo motor (21), and the other end or a middle position thereof is connected to an adapter plate (23), a support seat (24) is fixed on the adapter plate (23), and a resistance welding assembly is connected to the lower end of the support seat (24). The upper end of the support seat (24) is provided with a floating mounting groove (241), the adapter plate (23) is connected to an elastic member positioning plate (230) above the support seat (24), and the floating pressure measuring assembly includes a pre-loaded elastic member (31), a pressure block (32), and a pressure sensor (33). The pre-stressed elastic member (31) is located between the elastic member positioning plate (230) and the floating installation groove (241), and its lower end is connected to the pressure block (32). The pressure sensor (33) is arranged in the floating installation groove (241) and is located below the pressure block (32) for real-time measurement of welding pressure. The control module is electrically connected to the pressure sensor (33) and the servo motor (21), respectively. The pressure sensor (33) transmits the welding pressure value to the control module, and stops the operation of the servo motor (21) when the welding pressure value does not meet the welding requirements.

2. The servo-compression resistance welding mechanism according to claim 1, characterized in that: At least one in-position sensor (41) is provided on one side of the base plate (1) along the Z-axis direction, and a sensing sheet (42) that cooperates with the in-position sensor (41) is correspondingly provided on one side of the adapter plate (23), and the in-position sensor (41) is electrically connected to the control module.

3. The servo-compression resistance welding mechanism according to claim 2, characterized in that: A sensor mounting bar (14) extending along the Z-axis direction is provided on one side of the base plate (1), and the in-position sensor (41) is a slot-type photoelectric switch mounted on the sensor mounting bar (14).

4. The servo-compression resistance welding mechanism according to claim 1, characterized in that: A movable linear guide rail (11) extending along the Z-axis direction is provided on one side of the base plate (1) corresponding to the adapter plate (23); a guide block (231) is provided on one side of the adapter plate (23) close to the base plate (1); and the guide block (231) is correspondingly provided with a first sliding groove (232) that is adapted in shape to the movable linear guide rail (11) and forms an inserting and sliding fit.

5. The servo-compression resistance welding mechanism according to claim 4, characterized in that: Two movable linear guide rails (11) are provided in parallel and are located near both ends of the adapter plate (23) in the horizontal direction. Each movable linear guide rail (11) is correspondingly matched with at least two guide blocks (231) distributed along the Z-axis direction.

6. The servo-compression resistance welding mechanism according to claim 4, characterized in that: The bottom plate (1) is connected to an upper limit block (12) and a lower limit block (13) at the upper and lower ends of the movable linear guide rail (11) on one side corresponding to the adapter plate (23), and the lower end of the upper limit block (12) and the upper end of the lower limit block (13) are connected to an upper buffer pad (121) and a lower buffer pad (131) at the upper / lower ends of the adapter plate (23).

7. The servo-compression resistance welding mechanism according to any one of claims 1 to 6, characterized in that: A preload linear guide rail (233) extending along the Z-axis direction is provided on one side of the adapter plate (23) corresponding to the floating pressure measuring assembly, and a second sliding groove (234) that is adapted to the shape of the preload linear guide rail (233) and forms an inserting and sliding fit is correspondingly provided on the elastic member positioning plate (230) and the support seat (24).

8. The servo-compression resistance welding mechanism according to any one of claims 1 to 6, characterized in that: A buffer fitting portion (242) is extended from the upper end of the support seat (24) to both sides. A buffer support block (235) extending toward the support seat (24) is provided below the buffer fitting portion (242) on one side of the adapter plate (23) corresponding to the support seat (24). The buffer support block (235) is provided with a buffer member (236) fixed along the Z-axis direction, the upper end of which abuts against the lower end of the buffer fitting portion (242).

9. The servo-compression resistance welding mechanism according to any one of claims 1 to 6, characterized in that: The lower end of the support seat (24) is connected to an insulating plate (51), the bottom of the insulating plate (51) is connected to an electrode mounting plate (52), and the resistance welding assembly includes an electrode assembly (53) connected to the electrode mounting plate (52).

10. The servo-compression resistance welding mechanism according to any one of claims 1 to 6, characterized in that: One end of the transmission screw (22) is connected to the driving end of the servo motor (21) through a coupling (6).

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