Intermediate-frequency spot welding machine

Abstract

The utility model discloses a medium-frequency spot welding machine, which belongs to the technical field of spot welding machines, and structurally comprises a case main body, an upper electrode welding head, a lower electrode welding head, an adjusting plate and a servo motor, a vertical column is in sliding fit with the top of the adjusting plate, a transverse plate is fixed at the top end of the vertical column, and a positioning plate is in sliding fit with the lower surface of the transverse plate; a side plate is fixed to one side of the stand column, an electric push rod and a positioning column are fixedly installed on the side plate, a lifting plate slidably sleeves the positioning column, a lower clamping column is rotatably connected to the upper surface of the lifting plate, a gear is fixed to the bottom end of the lower clamping column, and a sector gear is fixed to the output end of the servo motor; and the fan-shaped teeth are in meshed connection with the gear. According to the intermediate frequency spot welding machine, the welding position of the circular workpiece can be automatically adjusted, labor intensity is reduced, welding efficiency is improved, proper adjustment can be made according to the size of the circular workpiece and the welding position of a bolt column, and practicability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of spot welding machines, in particular to a medium frequency spot welding machine. Background Art

[0002] The medium frequency inverter welding machine rectifies and filters 50HZ AC power and inverts it into a medium frequency square wave of 800HZ to 2000HZ. The medium frequency transformer (the volume and weight of the transformer are only about 40% of the traditional welding transformer) steps down the voltage to low voltage AC power and then undergoes single-phase full-wave rectification to low voltage DC power. The workpiece is welded by an integrated spot welding clamp or a fixed spot welding machine. The medium frequency spot welding machine is often used to weld nuts or bolts. However, the position of the electrode welding head of the existing medium frequency spot welding machine is usually inconvenient to move during the welding process, which affects the welding efficiency.

[0003] For example, in the process of welding and fixing bolts on a circular plate structure, since multiple bolt columns distributed in a ring shape need to be welded and fixed on the circular plate, during the welding operation, workers are required to continuously rotate the circular plate and change the position of the welding workpiece to achieve multi-point welding of the workpiece, resulting in slow processing efficiency, increased labor intensity of users, and reduced working efficiency of the spot welding machine. Utility Model Content

[0004] In order to solve the deficiencies in the above-mentioned prior art, the purpose of the utility model is to provide a medium frequency spot welding machine, which can realize automatic adjustment of the welding position of the circular workpiece, reduce labor intensity, improve welding efficiency, and can make appropriate adjustments according to the size of the circular workpiece and the welding position of the bolt column, and has strong practicality.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A medium frequency spot welding machine is provided, comprising a chassis body, an upper cantilever and a lower cantilever are fixed on one side of the chassis body, an upper hydraulic cylinder and a lower hydraulic cylinder are fixedly installed on one end of the upper cantilever and the lower cantilever respectively, an upper electrode seat is fixed on the output end of the upper hydraulic cylinder, an upper electrode welding head is fixedly installed on the lower surface of the upper electrode seat, a lower electrode seat is fixed on the output end of the lower hydraulic cylinder, a lower electrode welding head is fixed on the upper surface of the lower electrode seat, a placement groove is provided on the lower electrode welding head, a bottom plate is fixed on the bottom of the chassis body, an adjustment plate is fixed on the upper surface of the bottom plate, a column is slidably matched on the top of the adjustment plate, a cross plate is fixed on the top of the column, a positioning plate is slidably matched on the lower surface of the cross plate, and an upper clamping column is rotatably connected to one end of the lower surface of the cross plate;

[0007] A side plate is fixed to one side of the column, an electric push rod and a positioning column are fixedly installed on the side plate, a lifting plate is slidably sleeved on the positioning column, the output end of the electric push rod is fixedly connected to the lower surface of the lifting plate, a lower clamping column is rotatably connected to the upper surface of the lifting plate at a position corresponding to the upper clamping column, the bottom end of the lower clamping column passes through the lifting plate and is fixed with a gear, a servo motor is fixedly installed at the bottom of the lifting plate, a sector tooth is fixed on the output end of the servo motor, and the sector tooth is meshingly connected with the gear.

[0008] Furthermore, one end of the lifting plate is in sliding contact with the side surface of the column, a bracket is fixed on the lower surface of the lifting plate, and the servo motor is fixedly mounted on the bracket.

[0009] Furthermore, the positioning plate is an arc-shaped plate structure, and a mounting plate is fixed on one side of the positioning plate. The mounting plate is slidably fitted on the lower surface of the horizontal plate, and an upper threaded screw is rotatably connected to one side of the mounting plate. One end of the upper threaded screw passes through the column and is threadedly connected to the column, and a handwheel is fixedly installed on one end of the upper threaded screw.

[0010] Furthermore, the transverse plate is provided with a first sliding groove, and a first sliding block is fixed on the upper surface of the mounting plate, and the first sliding block is slidably fitted in the first sliding groove.

[0011] Furthermore, a guide column is fixed in the first sliding groove, and the first sliding block is slidably sleeved on the outer side of the guide column.

[0012] Furthermore, a second slide groove is provided in the adjustment plate, a lower threaded screw is rotatably connected in the second slide groove, a second slider is slidably fitted in the second slide groove, the lower threaded screw passes through the second slider and is threadedly connected to the second slider, the bottom end of the column is fixedly connected to the upper surface of the second slider, one end of the lower threaded screw passes through the adjustment plate and is also fixed with a handwheel.

[0013] Furthermore, a conductive tube is fixed on one side of the chassis body, and copper strips are electrically connected to one side of the upper electrode seat and the lower electrode seat, and the bent sections of the two copper strips are slidably matched with the top and bottom of the conductive tube respectively.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. The medium frequency spot welding machine of the utility model example pushes the lifting plate toward the horizontal plate through the electric push rod, so that the upper clamping column and the lower clamping column clamp and fix the center point of the circular workpiece, and the servo motor drives the sector teeth to rotate. The sector teeth can periodically drive the gears to rotate a specific angle, thereby driving the upper clamping column, the lower clamping column and the circular workpiece to rotate synchronously at the same specific angle, thereby realizing automatic adjustment of the welding position of the circular workpiece, so that the upper electrode welding head and the lower electrode welding head can automatically weld and fix the bolt columns and the circular workpiece located at different positions together, thereby reducing labor intensity and improving welding efficiency.

[0016] 2. The medium frequency spot welding machine of the utility model example can make the center of the circular workpiece be located between the upper clamping column and the lower clamping column by making the peripheral side surface of the circular workpiece contact with the arc-shaped side surface of the positioning plate. The position of the center point of the circular workpiece can be quickly determined, which is convenient for workers to quickly clamp and fix the circular workpiece. By rotating the upper threaded screw, the mounting plate can be driven to move laterally, and the position of the positioning plate can be changed to adapt to the rapid positioning and clamping of circular workpieces of different diameters.

[0017] 3. In the medium frequency spot welding machine of the utility model example, when the size of the circular workpiece changes or the welding position of the bolt column changes, so that the bolt column is not located between the upper electrode welding head and the lower electrode welding head, the second slider can be driven to slide by rotating the lower threaded screw, thereby driving the entire column to move, thereby achieving precise adjustment of the welding position of the bolt column on the circular workpiece, so that the bolt column is located on the vertical connecting line between the upper electrode welding head and the lower electrode welding head. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0019] Figure 1 It is a structural schematic diagram of the utility model;

[0020] Figure 2 It is a schematic diagram of the structure of the lifting plate and the horizontal plate of the utility model when they are matched;

[0021] Figure 3 It is a structural schematic diagram of the horizontal plate of the utility model;

[0022] Figure 4 It is a structural schematic diagram of the adjustment plate of the utility model;

[0023] Figure 5 The utility model is a structural schematic diagram of a circular workpiece, a bolt column and a lower electrode welding head.

[0024] In the figure, 1. chassis body, 2. upper cantilever, 3. lower cantilever, 4. upper hydraulic cylinder, 5. lower hydraulic cylinder, 6. upper electrode holder, 7. upper electrode welding head, 8. lower electrode holder, 9. lower electrode welding head, 10. copper strip, 11. conductive tube, 12. round workpiece, 13. bolt column, 14. placement groove, 15. bottom plate, 16. adjustment plate, 17. column, 18. horizontal plate, 19. side plate, 20. electric push rod, 21. positioning column, 22. lifting plate, 23. servo motor, 24. sector gear, 25. upper clamping column, 26. lower clamping column, 27. gear, 28. positioning plate, 29. mounting plate, 30. upper threaded screw, 31. first slider, 32. first slide groove, 33. guide column, 34. second slide groove, 35. second slider, 36. lower threaded screw. DETAILED DESCRIPTION

[0025] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all of the embodiments.

[0026] The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0027] Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present utility model.

[0028] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. It should also be noted that, for ease of description, only the parts related to the utility model are shown in the drawings.

[0031] Example: Reference Figure 1-5 A medium frequency spot welding machine shown in the figure comprises a chassis body 1, an upper cantilever 2 and a lower cantilever 3 are fixed on one side of the chassis body 1, an upper hydraulic cylinder 4 and a lower hydraulic cylinder 5 are fixedly installed on one end of the upper cantilever 2 and the lower cantilever 3, respectively, an upper electrode holder 6 is fixed on the output end of the upper hydraulic cylinder 4, an upper electrode welding head 7 is fixedly installed on the lower surface of the upper electrode holder 6, a lower electrode holder 8 is fixed on the output end of the lower hydraulic cylinder 5, a lower electrode welding head 9 is fixed on the upper surface of the lower electrode holder 8, a placement groove 14 is provided on the lower electrode welding head 9, a bottom plate 15 is fixed on the bottom of the chassis body 1, an adjustment plate 16 is fixed on the upper surface of the bottom plate 15, a column 17 is slidably matched on the top of the adjustment plate 16, a cross plate 18 is fixed on the top of the column 17, a positioning plate 28 is slidably matched on the lower surface of the cross plate 18, and an upper clamping column 25 is rotatably connected to one end of the lower surface of the cross plate 18;

[0032] A side plate 19 is fixed to one side of the column 17, and an electric push rod 20 and a positioning column 21 are fixedly installed on the side plate 19. A lifting plate 22 is slidably sleeved on the positioning column 21, and the output end of the electric push rod 20 is fixedly connected to the lower surface of the lifting plate 22, and a lower clamping column 26 is rotatably connected to the upper surface of the lifting plate 22 corresponding to the position of the upper clamping column 25. The bottom end of the lower clamping column 26 penetrates the lifting plate 22 and is fixed with a gear 27. A servo motor 23 is fixedly installed at the bottom of the lifting plate 22, and a fan-shaped tooth 24 is fixed to the output end of the servo motor 23, and the fan-shaped tooth 24 is meshed with the gear 27. A conductive tube 11 is fixed to one side of the chassis body 1, and a copper belt 10 is electrically connected to one side of the upper electrode seat 6 and the lower electrode seat 8, and the bending sections of the two copper belts 10 are respectively slidably matched with the top and bottom of the conductive tube 11.

[0033] In the process of spot welding using the utility model, mounting grooves are provided in a circular array on the circular workpiece 12, the bottom of the bolt column 13 passes through the mounting groove, a welding head is reserved on the top of the bolt column 13, the welding head contacts the upper surface of the circular workpiece 12, the position of the bolt column 13 is adjusted to be located between the upper electrode welding head 7 and the lower electrode welding head 9, during spot welding, the upper hydraulic cylinder 4 pushes the upper electrode holder 6 to move vertically downward, the lower hydraulic cylinder 5 pushes the lower electrode holder 8 to move vertically upward, the bottom of the bolt column 13 slides into the placement groove 14, the top of the lower electrode welding head 9 is in contact with the lower surface of the circular workpiece 12 The surfaces are tightly abutted, and the bottom end of the upper electrode welding head 7 abuts against the welding head on the bolt column 13. During this process, the bent sections of the two copper strips 10 slide on the top and bottom inner sides of the guide cylinder respectively, and the two copper strips 10 are electrically connected to the positive and negative circuits in the guide cylinder respectively. After the chassis body 1 controls the welding circuit to be energized, the welding head on the bolt column 13 can be welded and fixed to the circular workpiece 12. When the welding is completed, the chassis body 1 controls the welding circuit to be disconnected, and the upper hydraulic cylinder 4 and the lower hydraulic cylinder 5 respectively drive the upper electrode holder 6 and the lower electrode holder 8 to return to the initial position;

[0034] By fitting the side surface of the circular workpiece 12 with the arc-shaped side surface of the positioning plate 28, the center point of the circular workpiece 12 can be located between the upper clamping column 25 and the lower clamping column 26, which is used to quickly determine the position of the circular workpiece 12 and facilitate workers to quickly clamp and fix the circular workpiece 12. By pushing the lifting plate 22 up by the electric push rod 20, the lower clamping column 26 can be moved closer to the upper clamping column 25, and then the center point of the circular workpiece 12 can be clamped and fixed between the upper clamping column 25 and the lower clamping column 26. The servo motor 23 is started to drive the sector teeth 24 to rotate. Each time the sector teeth 24 are meshed with the gear 27, it will drive the gear 27 to rotate a specific range, so that the lower clamping column 26, the upper clamping column 25 and the circular workpiece 12 also rotate a specific range. The measuring range allows the bolt column 13 that has been welded to be rotated and moved away, and the next bolt column 13 to be welded is moved between the upper clamping column 25 and the lower clamping column 26, thereby realizing the automatic adjustment of the welding position of the circular workpiece 12, so that the upper electrode welding head 7 and the lower electrode welding head 9 can automatically weld and fix the bolt columns 13 and the circular workpiece 12 located at different positions together. The cooperation of the positioning column 21 and the electric push rod 20 can ensure that the lifting plate 22 can be stably lifted and lowered vertically. The setting of the adjustment plate 16 is used to accurately adjust the welding position of the bolt column 13 on the circular workpiece 12, so that the bolt column 13 is located on the vertical connecting line between the upper electrode welding head 7 and the lower electrode welding head 9. The positioning plate 28 slides on the lower surface of the horizontal plate 18, so as to quickly position the circular workpieces 12 of different diameters.

[0035] In order to improve the stability of the vertical lifting of the lifting plate 22 and facilitate the installation and fixing of the servo motor 23, in this embodiment, one end of the lifting plate 22 is in sliding contact with the side of the column 17, and a bracket is fixed on the lower surface of the lifting plate 22, and the servo motor 23 is fixedly installed on the bracket.

[0036] In order to enable the positioning plate 28 to quickly position and clamp circular workpieces 12 of different diameters, in this embodiment, the positioning plate 28 is an arc-shaped plate structure, and a mounting plate 29 is fixed on one side of the positioning plate 28, and the mounting plate 29 is slidably fitted on the lower surface of the horizontal plate 18. An upper threaded screw 30 is rotatably connected to one side of the mounting plate 29, and one end of the upper threaded screw 30 passes through the column 17 and is threadedly connected to the column 17. A handwheel is fixedly installed on one end of the upper threaded screw 30, and a first slide groove 32 is opened on the horizontal plate 18. A first slider 31 is fixed on the upper surface of the mounting plate 29, and the first slider 31 is slidably fitted in the first slide groove 32. A guide column 33 is fixed in the first slide groove 32, and the first slider 31 is slidably sleeved on the outer side of the guide column 33. The mounting plate 29 can be driven to move by rotating the upper threaded screw 30, and the first slider 31 slides inside the first slide groove 32, so that the mounting plate 29 drives the positioning plate 28 to move stably along a straight line on the lower surface of the cross plate 18, and the setting of the guide column 33 plays a role in bearing the weight of the mounting plate 29 and the positioning plate 28.

[0037] In order to accurately adjust the welding position of the bolt column 13 on the circular workpiece 12, in this embodiment, a second slide groove 34 is provided in the adjustment plate 16, a lower threaded screw 36 is rotatably connected in the second slide groove 34, a second slider 35 is slidably matched in the second slide groove 34, the lower threaded screw 36 passes through the second slider 35 and is threadedly connected to the second slider 35, the bottom end of the column 17 is fixedly connected to the upper surface of the second slider 35, one end of the lower threaded screw 36 passes through the adjustment plate 16 and is also fixed with a hand wheel. When the size of the circular workpiece 12 changes or the welding position of the bolt column 13 changes, the second slider 35 can be driven to slide by rotating the lower threaded screw 36, thereby driving the entire column 17 to move, and the bolt column 13 can be adjusted to the vertical connection line between the upper electrode welding head 7 and the lower electrode welding head 9.

[0038] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the utility model. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other to form a technical solution.

[0039] Except for the technical features described in the specification, the other technical features are known technologies to those skilled in the art. In order to highlight the innovative features of the present utility model, the other technical features will not be described in detail here.

Claims

1. A medium frequency spot welding machine, comprising a chassis body (1), an upper cantilever (2) and a lower cantilever (3) being fixed to one side of the chassis body (1), an upper hydraulic cylinder (4) and a lower hydraulic cylinder (5) being fixedly mounted to one end of the upper cantilever (2) and the lower cantilever (3), respectively, an upper electrode holder (6) being fixed to the output end of the upper hydraulic cylinder (4), an upper electrode welding head (7) being fixedly mounted to the lower surface of the upper electrode holder (6), a lower electrode holder (8) being fixed to the output end of the lower hydraulic cylinder (5), a lower electrode welding head (9) being fixed to the upper surface of the lower electrode holder (8), characterized in that: The lower electrode welding head (9) is provided with a placement groove (14), a bottom plate (15) is fixed to the bottom of the chassis body (1), an adjustment plate (16) is fixed to the upper surface of the bottom plate (15), a vertical column (17) is slidably engaged with the top of the adjustment plate (16), a horizontal plate (18) is fixed to the top of the vertical column (17), a positioning plate (28) is slidably engaged with the lower surface of the horizontal plate (18), and an upper clamping column (25) is rotatably connected to one end of the lower surface of the horizontal plate (18); A side plate (19) is fixed to one side of the upright column (17), an electric push rod (20) and a positioning column (21) are fixedly mounted on the side plate (19), a lifting plate (22) is slidably sleeved on the positioning column (21), an output end of the electric push rod (20) is fixedly connected to the lower surface of the lifting plate (22), a lower clamping column (26) is rotatably connected to the upper surface of the lifting plate (22) at a position corresponding to the upper clamping column (25), the bottom end of the lower clamping column (26) passes through the lifting plate (22) and is fixed with a gear (27), a servo motor (23) is fixedly mounted at the bottom of the lifting plate (22), a sector tooth (24) is fixed to the output end of the servo motor (23), and the sector tooth (24) is meshingly connected with the gear (27).

2. The medium frequency spot welding machine according to claim 1, characterized in that: One end of the lifting plate (22) is in sliding contact with the side surface of the column (17), a bracket is fixed on the lower surface of the lifting plate (22), and the servo motor (23) is fixedly mounted on the bracket.

3. The medium frequency spot welding machine according to claim 1, characterized in that: The positioning plate (28) is an arc-shaped plate-like structure. A mounting plate (29) is fixed to one side of the positioning plate (28). The mounting plate (29) is slidably fitted on the lower surface of the horizontal plate (18). An upper threaded screw (30) is rotatably connected to one side of the mounting plate (29). One end of the upper threaded screw (30) passes through the column (17) and is threadedly connected to the column (17). A hand wheel is fixedly mounted to one end of the upper threaded screw (30).

4. The medium frequency spot welding machine according to claim 3, characterized in that: A first sliding groove (32) is provided on the transverse plate (18), a first sliding block (31) is fixed on the upper surface of the mounting plate (29), and the first sliding block (31) is slidably engaged in the first sliding groove (32).

5. The medium frequency spot welding machine according to claim 4, characterized in that: A guide column (33) is fixed in the first sliding groove (32), and the first sliding block (31) is slidably sleeved on the outside of the guide column (33).

6. The medium frequency spot welding machine according to claim 1, characterized in that: The adjusting plate (16) is provided with a second slide groove (34), a lower threaded screw rod (36) is rotatably connected in the second slide groove (34), a second slider (35) is slidably matched in the second slide groove (34), the lower threaded screw rod (36) passes through the second slider (35) and is threadedly connected to the second slider (35), the bottom end of the column (17) is fixedly connected to the upper surface of the second slider (35), one end of the lower threaded screw rod (36) passes through the adjusting plate (16) and is also fixed with a hand wheel.

7. The medium frequency spot welding machine according to any one of claims 1 to 6, characterized in that: A conductive tube (11) is fixed to one side of the chassis body (1), and copper strips (10) are electrically connected to one side of the upper electrode seat (6) and the lower electrode seat (8), and the bent sections of the two copper strips (10) are respectively slidably matched with the top and bottom of the conductive tube (11).

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