Welding tongs clamping device

Abstract

The utility model discloses an electrode holder clamping device which comprises a fixing plate and a static arm fixedly connected to the fixing plate, and the end, away from the fixing plate, of the static arm is fixedly connected with a static electrode. A linear driving device is clamped between the fixing plates, the driving end of the linear driving device is connected with an electrode connecting rod, and one end of the electrode connecting rod is fixedly connected with a movable electrode; a guide pin is fixedly connected to the side wall of the electrode connecting rod, a guide groove is formed in the fixing plate, and the guide pin is inserted into the guide groove in a penetrating mode. The linear driving device comprises a connecting flange, a pin shaft is fixedly connected to the side wall of the connecting flange, an arc-shaped groove is formed in the fixing plate, the pin shaft is inserted into the arc-shaped groove in a penetrating mode, and the pin shaft swings along the arc-shaped groove in the welding process so that the moving electrode swings along with deflection of a workpiece to be kept coaxial with the static electrode. According to the utility model, the movable electrode and the static electrode are kept in a coaxial state before welding and during pressurized welding, so that welded workpieces are kept in good contact, and the welding quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of welding clamping technology, specifically to a welding clamping device. Background Technology

[0002] In resistance spot welding, two electrodes apply a clamping force to the workpiece and a large current is applied to form a weld nugget between the workpieces to complete the welding. However, due to the elastic deformation of the stationary arm under the clamping force, the stationary arm electrode deflects, causing the two opposing electrodes to become non-coaxial. This results in the workpiece and electrode end faces not remaining parallel. Figure 15-16 As shown, the deflection of the stationary electrode results in an offset angle α, which leads to uneven force on the electrode during welding, and uneven weld nugget formation, affecting the welding quality and aesthetics.

[0003] In particular, when the resistance welding robot moves to weld nuts or studs, the displacement of the stationary arm electrode causes the welding nut or stud to be out of parallel with the metal plate. As a result, the welding part of the welding nut or stud cannot be fully attached to the metal plate, resulting in an incomplete weld between the welding leg of the nut and the metal plate, leading to an unstable weld. The welding end face of the stud is tilted to the metal plate, and the stud or nut is not perpendicular to the metal plate, which affects both the welding strength and the assembly of the parts.

[0004] In existing technologies, such as the improved welding clamp disclosed in Chinese Patent Publication No. CN202963774U, both the movable electrode arm and the floating electrode arm can move relative to the workpiece to be welded, and can automatically adjust their position even when the electrode cap is worn. However, this only adjusts the position of the welding electrodes and cannot solve the problem of the welding electrodes becoming non-coaxial and non-parallel after being deflected by the clamping force during welding. Therefore, it is necessary to improve the existing welding clamp clamping method and clamping structure. Utility Model Content

[0005] The purpose of this invention is to solve the technical problem that the welding electrodes cannot be coaxial due to the bending and deformation of the welding arm during welding in the resistance welding machine. It provides a welding clamping device that ensures that the moving electrode and the stationary electrode of the welding gun remain coaxial before and during welding.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This application provides a welding clamping device, including a fixed plate and a stationary arm fixedly connected to the fixed plate. The fixed plate is clamped and fixed on both sides of the stationary arm, and the fixed plate and the stationary arm form a C-shaped structure. A stationary electrode is fixedly connected to the end of the stationary arm away from the fixed plate. A linear drive device is clamped between the fixed plates. An electrode connecting rod is connected to the drive end of the linear drive device. A moving electrode is fixedly connected to the end of the electrode connecting rod away from the linear drive device. The moving electrode and the stationary electrode are arranged opposite to each other to clamp and weld the workpiece.

[0008] A guide pin is fixedly connected to the side wall of the electrode connecting rod. A guide groove is provided on the fixing plate along the axial direction of the electrode connecting rod. The guide pin is inserted into the guide groove. The width of the guide groove near the static electrode is greater than the diameter of the guide pin so that there is a floating gap between the guide pin and the guide groove in the welding state.

[0009] The linear drive device includes a connecting flange, and a pin is fixedly connected to the side wall of the connecting flange. The pin is arranged perpendicular to the driving direction of the linear drive device. An arc-shaped groove is formed on the fixed plate, and the pin passes through the arc-shaped groove. During welding, the pin swings along the arc-shaped groove to allow the moving electrode to swing with the workpiece to maintain coaxiality with the stationary electrode. Preferably, the center line of the arc-shaped groove is an arc, and the center of the arc is the center position of the welding end face of the moving electrode when it abuts against the workpiece, thereby facilitating the swinging of the moving electrode.

[0010] Through the above scheme, during pressure clamping welding, the entire moving electrode and its associated drive mechanism are in a swingable state, causing the moving electrode to tilt away from the stationary electrode as it tilts. At this time, the moving electrode, electrode connecting rod, and linear drive device all synchronously deflect away from the stationary arm, thus maintaining the coaxiality of the moving and stationary electrodes. Before welding, when the moving electrode moves towards the stationary electrode, it is initially coaxial with the stationary electrode before deformation. After welding pressure is applied, the moving electrode deflects synchronously with the stationary electrode, ensuring that the moving electrode remains coaxial with the stationary electrode both when the stationary electrode is not under welding clamping force and when it is under welding clamping force, thereby guaranteeing welding quality. This avoids welding angles between the moving and stationary electrodes, reducing welding quality problems caused by non-parallelism between workpieces, such as spatter, uneven weld nugget, and weak welds due to workpiece angles. This is especially important when welding nuts or studs to sheet metal, where non-parallelism between the nut or stud and the sheet metal can lead to weak welds and misalignment, affecting assembly.

[0011] Furthermore, the linear drive device includes a drive motor and a drive screw. The drive motor and a reducer integrally connected thereto are mounted on a connecting flange, which is located inside the fixing plates on both sides. The output end of the drive motor is fixedly connected to the drive screw after speed reduction by the reducer. The drive screw is threadedly connected to a drive nut, which is fixedly connected to the end of the electrode connecting rod. The rotation of the drive screw drives the drive nut to move, thereby driving the electrode connecting rod to move. This allows the electrode connecting rod to drive the moving electrode to clamp the workpiece for welding, and after welding, to drive the moving electrode back away from the workpiece to complete the reset.

[0012] Furthermore, a first magnet is provided on the side wall of the arc-shaped groove away from the moving electrode, and a second magnet is provided on the side of the pin away from the moving electrode. The first and second magnets are arranged opposite each other, and the magnetic poles of the sides of the first and second magnets that are close to each other are the same to generate a magnetic repulsive force. The pin is supported by the magnetic repulsive force generated by the first and second magnets. During the welding process, when the linear drive device drives the moving electrode to move towards the stationary electrode to clamp the workpiece, the first magnet generates a repulsive thrust on the second magnet to reduce the frictional resistance between the pin and the arc-shaped groove. When the stationary electrode rotates under force, the moving electrode generates a lateral deflection force, causing the moving electrode to deflect along with the stationary electrode. The pin, through the action of the second and first magnets, reduces the resistance during the deflection of the moving electrode, making it easier for the moving electrode to maintain synchronous deflection with the stationary electrode, thereby ensuring that the moving electrode and the stationary electrode remain coaxial and the welding end faces are parallel.

[0013] Furthermore, a floating guide block is fitted onto the electrode connecting rod. The floating guide block is located on the side of the guide pin away from the linear drive device. A guide hole matching the outer wall of the electrode connecting rod is formed in the floating guide block. The electrode connecting rod slides along the guide hole to allow axial sliding along the floating guide block. An eccentric shaft is rotatably connected to the floating guide block. The eccentric shaft includes a first round shaft and a second round shaft eccentrically fixed at both ends of the first round shaft. The first round shaft is rotatably connected to the floating guide block, and the second round shaft is rotatably connected to a fixed plate. A limit groove is provided on the inner side of the fixed plate, and the floating guide block is located in the limit groove. The floating guide block guides the electrode connecting rod, keeping it stable during movement. When the electrode connecting rod deflects during welding, the eccentric shaft, under the action of external force, causes the floating guide block to swing together with the electrode connecting rod. When the electrode connecting rod resets, the floating guide block resets with the electrode connecting rod.

[0014] Furthermore, a fourth magnet is fixedly connected to the side wall of the limiting groove away from the eccentric rotating shaft, and a fifth magnet is provided at the end of the floating guide block away from the eccentric rotating shaft. The fifth magnet and the fourth magnet are positioned opposite each other, and their magnetic poles are different at their closest points. The welding deflection force generated during pressure welding is transmitted to the floating guide block. During the welding process, the deflection force generated by the welding clamping force overcomes the attraction of the fourth and fifth magnets, causing them to separate, thereby allowing the electrode connecting rod to deflect freely. When the electrode connecting rod resets, the floating guide block moves closer to the fourth magnet as the electrode connecting rod moves. The mutual attraction between the fourth and fifth magnets assists in the reset of the floating guide block, improving the reset accuracy.

[0015] Furthermore, the guide groove has a first guide section and a second guide section. The second guide section is located at the end of the first guide section near the moving electrode. The sidewall of the first guide section near the stationary arm is flush with the sidewall of the second guide section near the stationary arm and parallel to the axis of the electrode connecting rod. The groove width of the first guide section is consistent with the outer diameter of the guide pin to guide the guide pin. The groove width of the second guide section is greater than the outer diameter of the guide pin so that the guide pin has a free movement gap in the second guide section. By setting the guide groove into two sections, the first guide section resets the guide pin, while the second guide section allows the guide pin to swing freely. Specifically, since the groove width of the first guide section is consistent with the outer diameter of the guide pin, when the guide pin retracts into the first guide section, the center of the guide pin coincides with the center line of the first guide section under the guiding action of the first guide section. Under the combined action of the synchronous reset of the pin shaft, the electrode connecting rod is in its initial state. At this time, the moving electrode and the stationary electrode at the lower end of the electrode connecting rod are initially coaxial. When the guide pin moves into the second guide section, the width of the second guide section is greater than that of the guide pin, so that there is a swing gap between the guide pin and the second guide section. This allows the guide pin, the electrode connecting rod and the moving electrode that are fixed to it, to be in a free swinging state, and the moving electrode to swing with the stationary electrode.

[0016] In another embodiment, a pushing mechanism is provided on one side of the fixed plate. This mechanism switches between two states: reset and free swing of the electrode connecting rod. The guide groove is a straight groove of equal width, with a groove width greater than the diameter of the guide pin. The pushing mechanism includes a second driving device. The driving end of the second driving device is connected to a driving abutment block. The abutment block is located on the side of the electrode connecting rod away from the fixed plate and is located inside the fixed plate, slidingly engaging with it. When the moving electrode approaches the stationary electrode to clamp the workpiece, the driving end of the second driving device extends and abuts the abutment block against the side wall of the electrode connecting rod, keeping the moving electrode and stationary electrode coaxial. When the moving electrode and stationary electrode apply pressure to weld the workpiece, the driving end of the second driving device disengages the abutment block from the electrode connecting rod, allowing the electrode connecting rod to swing with the moving electrode. After welding, when the moving electrode moves away from the stationary electrode, the driving end of the second driving device extends and abuts the abutment block against the side wall of the electrode connecting rod, resetting the electrode connecting rod to its initial position.

[0017] Furthermore, it also includes a reset mechanism, which is used to perform auxiliary reset of the linear drive device.

[0018] In one embodiment, the reset mechanism includes a third magnet located on one side of the linear drive device. The third magnet is fixedly connected to a fixed plate and is used to attract and assist the linear drive device in resetting. During welding, the linear drive device applies welding pressure to the workpiece. Under the deflection of the stationary electrode, the deflection force overcomes the magnetic attraction between the third magnet and the housing of the linear drive device, causing the linear drive device to deflect. This keeps the moving electrode and the stationary electrode deflecting and oscillating synchronously. After welding is completed, when the linear drive device drives the moving electrode to move upward for reset, the linear drive device moves closer to the third magnet. When the third magnet generates a magnetic attraction with the housing of the linear drive device, the linear drive device quickly resets to its initial state, thereby improving reset accuracy and reset speed.

[0019] In another embodiment, the reset mechanism includes a reset column fixed to a connecting flange, a mounting plate fixedly connected to the fixing plate, a through hole on the mounting plate, a reset block slidably connected in the through hole, the reset block being located on the side of the reset column closer to the axis of the linear drive device, a reset inclined surface being provided at the end of the reset block facing the reset column, a push rod fixedly connected to the electrode connecting rod, the end of the push rod away from the moving electrode facing the reset block, when the linear drive device drives the electrode connecting rod to move towards the linear drive device end, causing the push rod to push the reset block towards the reset column, so that the reset inclined surface squeezes the reset column, thereby resetting and straightening the tilted linear drive device.

[0020] Furthermore, a baffle is fixedly connected to the end of the reset block away from the reset post, and a compression spring is provided on the outside of the reset block. The compression spring is located between the mounting plate and the baffle. The elastic force of the compression spring causes the reset block to be pushed away from the reset post when the push rod moves away from the reset block, thereby making the linear drive device in a free swinging state.

[0021] In the reset mechanism of the above scheme, when the linear drive device drives the electrode connecting rod and the moving electrode to move towards the workpiece, the reset block disengages from the reset column, so that the linear drive device is in an automatic swinging state along the arc groove. When the moving electrode clamps the workpiece, the moving electrode swings with the stationary electrode and the workpiece, driving the linear drive device, which is coaxial with the moving electrode, to swing freely, thereby keeping the moving electrode and the stationary electrode coaxial and avoiding the linear drive device from jamming and preventing the moving electrode from swinging freely. After welding is completed, the linear drive device drives the electrode connecting rod and the moving electrode to move away from the stationary electrode. During the movement of the electrode connecting rod away from the stationary electrode, it drives the top rod to press against the reset block. The reset block squeezes the reset column through the reset inclined surface, thereby causing the reset column to move away from the axis of the linear drive device, thus correcting and resetting the linear drive device that has swung outward during the welding process. The electrode connecting rod is reset to the initial position through the guide groove or the pushing mechanism, so that the electrode connecting rod and the moving electrode at the lower end of the linear drive device are in an initial coaxial state with the stationary electrode that is not subjected to clamping force.

[0022] A welding clamping device is disclosed, which performs clamping welding in the following manner during operation: a C-type resistance welding clamp is used to clamp and weld the workpiece. The C-type resistance welding clamp includes a fixed plate and a stationary arm fastened to one end of the fixed plate. A stationary electrode is provided at one end of the stationary arm, and a linear drive device is clamped at one end of the fixed plate. A moving electrode is provided at the end of the linear drive device away from the drive motor. The moving electrode and the stationary electrode are used to clamp and weld the workpiece. When the linear drive device drives the moving electrode to clamp and weld the workpiece, the moving electrode and the fixed plate are transformed into a rotatable support state. Under the action of the welding clamping force, the moving electrode swings with the deflection of the workpiece to maintain coaxiality with the stationary electrode. Before welding, the moving electrode is coaxial with the stationary electrode that is not compressed, so that the moving electrode remains coaxial with the stationary electrode before it comes into contact with the workpiece and is pressurized. During the welding pressurization process, the moving electrode changes to a rotatable support state. When the moving electrode is pressurized, the stationary arm bends and deforms away from the moving electrode. The stationary electrode is deflected away from the moving electrode under the pressure and clamping force of the moving electrode. During the deflection process, the deflection force is transmitted to the moving electrode, so that the rotatable moving electrode deflects along with the stationary electrode. Thus, the moving electrode and the stationary electrode remain coaxial during the welding pressurization process.

[0023] The welding clamping device provided by this utility model has the following beneficial effects: During operation, the linear drive device drives the electrode connecting rod to move downward, and the electrode connecting rod drives the moving electrode to move downward in a straight line to above the stationary electrode. When there is no clamping force, the moving electrode and the stationary electrode remain coaxial. During pressure welding, the electrode connecting rod is in a state of free left and right swing. There is a swing gap between the second transmission pin on the linear drive device and the arc groove, so that the electrode connecting rod and the linear drive device connected to it are in a state of free left and right swing. The linear drive device drives the moving electrode to move towards the stationary electrode to apply welding pressure to the workpiece. The stationary electrode is deflected under the action of clamping force. Under the action of the deflection force generated by the deflection of the stationary electrode, the moving electrode, the electrode connecting rod, and the linear drive device swing synchronously with the stationary electrode, thereby keeping the moving electrode and the stationary electrode in a coaxial state before welding and during welding pressure welding. This ensures good contact between the welded workpieces and improves the welding quality. Especially when welding nuts or studs, it can ensure the welding strength of the welded nuts or studs. Attached Figure Description

[0024] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings:

[0025] Figure 1 A schematic diagram of the structure of a welding clamping device provided by this utility model;

[0026] Figure 2 for Figure 1 A side sectional view of the middle electrode connecting rod position;

[0027] Figure 3 A schematic diagram of a welding clamping device with a pushing mechanism provided by this utility model;

[0028] Figure 4 for Figure 3 A top view of the structure of the middle abutment block;

[0029] Figure 5 A partial structural diagram of an arc-shaped groove with a first magnet in a welding clamping device provided by this utility model;

[0030] Figure 6 A schematic diagram of a welding clamping device with a floating guide block provided by this utility model;

[0031] Figure 7 for Figure 6 A side sectional view of the middle electrode connecting rod position;

[0032] Figure 8 for Figure 6 A schematic diagram of the lateral cross-sectional structure at the position of the eccentric pivot.

[0033] Figure 9 A schematic diagram of the three-dimensional structure of the eccentric rotating shaft;

[0034] Figure 10 A schematic diagram of the internal structure of the floating guide block position in a welding clamping device provided by the present invention;

[0035] Figure 11 A schematic diagram of an embodiment of a welding clamping device with a reset mechanism provided by the present invention;

[0036] Figure 12 for Figure 11 Schematic diagram of a partial structure at part A in the middle;

[0037] Figure 13 This is a schematic diagram of the initial state structure of a welding clamping device provided by the present invention;

[0038] Figure 14 This invention provides a schematic diagram of the pressure welding state structure of a welding clamping device;

[0039] Figure 15 This is a schematic diagram of the existing technology;

[0040] Figure 16 for Figure 15 A schematic diagram of the partial structure of the middle part.

[0041] The following are the labels in the diagram: 1. Fixed plate; 11. Guide groove; 111. First guide section; 112. Second guide section; 12. Arc groove; 121. First magnet; 122. Second magnet; 13. Limiting groove; 14. Fourth magnet; 15. Fifth magnet; 2. Static arm; 21. Static electrode; 3. Linear drive device; 31. Connecting flange; 32. Drive motor; 33. Drive screw; 34. Pin; 4. Electrode connecting rod; 41. Guide pin; 5. Moving electrode; 6. Floating guide block; 7. Eccentric rotating shaft; 71. First round shaft; 72. Second round shaft; 8. Pushing mechanism; 81. Second drive device; 82. Abutment block; 91. Third magnet; 92. Reset column; 93. Mounting plate; 94. Reset block; 941. Reset inclined surface; 95. Top rod; 96. Baffle; 97. Compression spring; 10. Plate; 101. Welded nut. Detailed Implementation

[0042] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0043] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0044] It should be noted that all directional indications (such as up-down-left-right-forward-backward...) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly. The connection can be a direct connection or an indirect connection.

[0045] This utility model provides a welding clamping device, such as... Figure 1-2 As shown, the device includes a fixed plate 1 and a stationary arm 2 fixedly connected to the fixed plate 1. The fixed plate 1 has two parts, which are respectively clamped and fixed on both sides of the stationary arm 2. The fixed plate 1 and the stationary arm 2 form a C-shaped structure. A stationary electrode 21 is fixedly connected to the end of the stationary arm 2 away from the fixed plate 1. A linear drive device 3 is clamped between the two fixed plates 1. An electrode connecting rod 4 is connected to the drive end of the linear drive device 3. A moving electrode 5 is fixedly connected to the end of the electrode connecting rod 4 away from the linear drive device 3. The moving electrode 5 and the stationary electrode 21 are arranged opposite to each other to clamp and weld the workpiece between them.

[0046] A guide pin 41 is fixedly connected to the side wall of the electrode connecting rod 4. A guide groove 11 is provided on the fixing plate 1 along the axial direction of the electrode connecting rod 4. The guide pin 41 is inserted into the guide groove 11. The width of the guide groove 11 near the stationary electrode 21 is greater than the diameter of the guide pin 41 so that there is a floating gap between the guide pin 41 and the guide groove 11 in the welding state.

[0047] The linear drive device 3 includes a connecting flange 31, on which a pin 34 is fixedly connected. The pin 34 is arranged perpendicular to the driving direction of the linear drive device 3. An arc-shaped groove 12 is provided on the fixing plate 1, and the pin 34 is inserted into the arc-shaped groove 12. During welding, the pin 34 swings along the arc-shaped groove 12 to make the moving electrode 5 swing with the workpiece to maintain coaxiality with the stationary electrode 21. Preferably, the centerline of the arc-shaped groove 12 is an arc, and the center of the arc is the center position of the welding end face of the moving electrode 5 when it abuts against the workpiece, thereby facilitating the swinging of the moving electrode 5.

[0048] With the above scheme, during pressure clamping welding, the entire moving electrode 5 and its associated drive mechanism are in a swingable state, causing the moving electrode 5 to tilt as the stationary electrode 21 tilts away from the moving electrode 5. At this time, the moving electrode 5, the electrode connecting rod 4, and the linear drive device 3 all deflect synchronously away from the stationary arm 2, thereby keeping the moving electrode 5 and the stationary electrode 21 coaxial. Before welding, when the moving electrode 5 moves towards the stationary electrode 21, the moving electrode 5 and the stationary electrode 21 before deformation are in an initial coaxial state. After welding pressure is applied, the moving electrode 5 deflects synchronously with the stationary electrode 21, so that the moving electrode 5 and the stationary electrode 21 automatically align during welding. This ensures that the moving electrode 5 remains coaxial with the stationary electrode 21 whether the stationary electrode 21 is not under welding clamping force or under welding clamping force, thereby guaranteeing the welding quality. To avoid welding angles between the moving electrode 5 and the stationary electrode 21, reduce welding quality problems caused by non-parallelism between workpieces, such as spatter, uneven weld nugget, and weak weld caused by the angle between workpieces. In particular, when welding the welding nut 101 or stud to the plate 10, the non-parallelism between the welding nut 101 or stud and the plate 10 can cause the welding leg to not be firmly welded and to be skewed to the plate, affecting assembly.

[0049] Specifically, the linear drive device 3 includes a drive motor 32 and a drive screw 33. The drive motor 32 and its integrated reducer are mounted on a connecting flange 31, which is located inside the fixing plates 1 on both sides. The output end of the drive motor 32 is fixedly connected to the drive screw 33 after speed reduction by the reducer. The drive screw 33 is threadedly connected to a drive nut, which is fixedly connected to the end of the electrode connecting rod 4. The drive screw 33 rotates to drive the drive nut to move, thereby driving the electrode connecting rod 4 to move. This allows the electrode connecting rod 4 to drive the moving electrode 5 to clamp the workpiece for welding, and after welding, to drive the moving electrode 5 back away from the workpiece to complete the reset.

[0050] like Figure 5As shown, in one embodiment, a first magnet 121 is provided on the side wall of the arc groove 12 away from the moving electrode 5, and a second magnet 122 is provided on the side of the pin 34 away from the moving electrode 5. The first magnet 121 and the second magnet 122 are arranged opposite to each other, and the magnetic poles of the sides of the first magnet 121 and the second magnet 122 that are close to each other are the same to generate magnetic repulsion. The pin 34 is supported by the magnetic repulsion force generated by the first magnet 121 and the second magnet 122. During the welding process, when the linear drive device 3 drives the moving electrode 5 to move towards the stationary electrode 21 to clamp the workpiece, the first magnet 121 generates a repulsive thrust on the second magnet 122 to reduce the frictional resistance between the pin 34 and the arc groove 12. When the stationary electrode 21 rotates under force, the moving electrode 5 generates a lateral deflection force, causing the moving electrode 5 to deflect along with the stationary electrode 21. The pin 34, through the action of the second magnet 122 and the first magnet 121, makes the resistance of the moving electrode 5 during the deflection process smaller, which makes it easier for the moving electrode 5 to maintain synchronous deflection with the stationary electrode 21, thereby ensuring that the moving electrode 5 and the stationary electrode 21 remain coaxial and parallel to the welding end face.

[0051] In one embodiment, such as Figure 6-9 As shown, a floating guide block 6 is fitted onto the electrode connecting rod 4. The floating guide block 6 is located on the side of the guide pin 41 away from the linear drive device 3. A guide hole matching the outer wall of the electrode connecting rod 4 is provided in the floating guide block 6. The electrode connecting rod 4 slides along the guide hole so that the electrode connecting rod 4 slides axially along the floating guide block 6. An eccentric rotating shaft 7 is rotatably connected to the floating guide block 6. The eccentric rotating shaft 7 includes a first round shaft 71 and a second round shaft 72 eccentrically fixed at both ends of the first round shaft 71. The two second round shafts 72 located at both ends of the first round shaft 71 are coaxially arranged. The first round shaft 71 is rotatably connected to the floating guide block 6, and the second round shaft 72 is rotatably connected to the fixing plate 1. A limit groove 13 is provided on the inner side of the fixing plate 1, and the floating guide block 6 is located in the limit groove 13. The electrode connecting rod 4 is guided by the floating guide block 6, so that the electrode connecting rod 4 remains stable during movement. When the electrode connecting rod 4 deflects during welding, the floating guide block 6 can be rotated and moved by the eccentric rotating shaft 7. Under the action of external force, the floating guide block 6 and the electrode connecting rod 4 swing together. When the electrode connecting rod 4 returns to its original position, the floating guide block 6 returns to its original position along with the electrode connecting rod 4.

[0052] In one embodiment, such as Figure 10As shown, a fourth magnet 14 is fixedly connected to the side wall of the limiting groove 13 away from the eccentric rotating shaft 7, and a fifth magnet 15 is provided at the end of the floating guide block 6 away from the eccentric rotating shaft 7. The fifth magnet 15 and the fourth magnet 14 are opposite to each other and have different magnetic poles at their closest ends. The welding deflection force generated during pressure welding is transmitted to the floating guide block 6. During welding, the deflection force generated by the welding clamping force overcomes the attraction between the fourth magnet 14 and the fifth magnet 15, causing them to separate, thus allowing the electrode connecting rod 4 to deflect freely. When the electrode connecting rod 4 resets, the floating guide block 6 moves closer to the fourth magnet 14 as the electrode connecting rod 4 moves. The mutual attraction between the fourth magnet 14 and the fifth magnet 15 assists in the reset of the floating guide block 6, improving the reset accuracy. In application, the magnetic attraction between the fourth magnet 14 and the fifth magnet 15 is less than the deflection force generated by welding pressure, so that the fourth magnet 14 and the fifth magnet 15 can separate.

[0053] like Figure 1 As shown, in one embodiment, the guide groove 11 has a first guide section 111 and a second guide section 112. The second guide section 112 is located at the end of the first guide section 111 near the moving electrode 5. The sidewall of the first guide section 111 near the stationary arm 2 is flush with the sidewall of the second guide section 112 near the stationary arm 2 and parallel to the axis of the electrode connecting rod 4. The groove width of the first guide section 111 is consistent with the outer diameter of the guide pin 41 to guide the guide pin 41. The groove width of the second guide section 112 is greater than the outer diameter of the guide pin 41 so that the guide pin 41 has a free movement gap in the second guide section 112. By setting the guide groove 11 into two sections, the first guide section 111 resets the guide pin 41, and the second guide section 112 allows the guide pin 41 to swing freely. Specifically, since the groove width of the first guide section 111 is consistent with the outer diameter of the guide pin 41, when the guide pin 41 retracts into the first guide section 111, the center of the guide pin 41 coincides with the center line of the first guide section 111 under the guidance of the first guide section 111. Under the joint action of the synchronous reset of the pin shaft 34, the electrode connecting rod 4 is in the initial state. At this time, the moving electrode 5 at the lower end of the electrode connecting rod 4 and the stationary electrode 21 are initially coaxial. When the guide pin 41 moves into the second guide section 112, the width of the second guide section 112 is greater than that of the guide pin 41, so that there is a swing gap between the guide pin 41 and the second guide section 112, which facilitates the guide pin 41 and the electrode connecting rod 4 and the moving electrode 5 that are fixed together with it to be in a free swing state, and facilitates the moving electrode 5 to swing with the stationary electrode 21.

[0054] In another embodiment, such as Figure 3-4As shown, a pushing mechanism 8 is provided on one side of the fixed plate 1. The pushing mechanism 8 switches between two states: reset and free swing. The guide groove 11 is a straight groove of equal width, and the groove width is greater than the diameter of the guide pin 41. The pushing mechanism 8 includes a second driving device 81. The driving end of the second driving device 81 is connected to a driving abutment block 82. The abutment block 82 is located on the side of the electrode connecting rod 4 away from the fixed plate 1. The abutment block 82 is located inside the fixed plate 1 and slides in cooperation with the fixed plate 1. When the moving electrode 5 approaches the stationary electrode 21 to clamp the workpiece, the driving end of the second driving device 81 extends and abuts the abutting block 82 against the side wall of the electrode connecting rod 4, so that the moving electrode 5 and the stationary electrode 21 on the electrode connecting rod 4 remain coaxial. When the moving electrode 5 and the stationary electrode 21 apply pressure to weld the workpiece, the driving end of the second driving device 81 drives the abutting block 82 to disengage from the electrode connecting rod 4, so that the electrode connecting rod 4 is in a state that can swing with the moving electrode 5. After the welding is completed, when the moving electrode 5 moves away from the stationary electrode 21, the driving end of the second driving device 81 extends and abuts the abutting block 82 against the side wall of the electrode connecting rod 4, so that the electrode connecting rod 4 returns to its initial position.

[0055] In another embodiment, a welding clamping device further includes a reset mechanism for assisting in the reset of the linear drive device 3.

[0056] In the implementation of a solution, such as Figure 1 As shown, the reset mechanism includes a third magnet 91, which is located on one side of the linear drive device 3 and is fixedly connected to the fixing plate 1. The third magnet 91 is used to attract the metal shell of the linear drive device 3 to assist in the reset of the linear drive device 3. During welding, the linear drive device 3 applies welding pressure to the workpiece. Under the deflection of the stationary electrode 21, the deflection force overcomes the magnetic attraction between the third magnet 91 and the shell of the linear drive device 3, causing the linear drive device 3 to deflect. This keeps the moving electrode 5 and the stationary electrode 21 deflecting and oscillating synchronously. After welding is completed, when the linear drive device 3 drives the moving electrode 5 to move upward to reset, the linear drive device 3 moves closer to the third magnet 91. When the third magnet 91 and the shell of the linear drive device 3 generate a magnetic attraction, the linear drive device 3 quickly resets to its initial state, thereby improving the reset accuracy and reset speed.

[0057] In another embodiment, such as Figure 11-12As shown, the reset mechanism includes a reset column 92 fixed on the connecting flange 31. A mounting plate 93 is fixedly connected to the fixing plate 1. A through hole is provided on the mounting plate 93, and a reset block 94 is slidably connected in the through hole. The reset block 94 is located on the side of the reset column 92 closer to the axis of the linear drive device 3. A reset inclined surface 941 is provided at the end of the reset block 94 facing the reset column 92. A top rod 95 is fixedly connected to the electrode connecting rod 4. The end of the top rod 95 away from the moving electrode 5 faces the reset block 94. When the linear drive device 3 drives the electrode 5 connecting rod 4 to move towards the end of the linear drive device 3, it drives the top rod 95 to push the reset block 94 towards the reset column 92, so that the reset inclined surface 941 squeezes the reset column 92, thereby resetting and straightening the tilted linear drive device 3.

[0058] Specifically, a baffle 96 is fixedly connected to the end of the reset block 94 away from the reset post 92. A compression spring 97 is provided on the outside of the reset block 94. The compression spring 97 is located between the mounting plate 93 and the baffle 96. The elastic force of the compression spring 97 causes the push rod 95 to push the reset block 94 away from the reset post 92 when it moves away from the reset block 94, thereby making the linear drive device 3 in a free swinging state.

[0059] In the reset mechanism of the above scheme, when the linear drive device 3 drives the connecting rod 4 of the electrode 5 and the moving electrode 5 to move towards the workpiece, the reset block 94 disengages from the reset post 92, so that the linear drive device 3 is in an automatic swinging state along the arc groove 12. When the moving electrode 5 clamps the workpiece, the moving electrode 5 swings with the swinging of the stationary electrode 21 and the workpiece, driving the linear drive device 3, which is coaxial with the moving electrode 5, to swing freely, thereby keeping the moving electrode 5 and the stationary electrode 21 coaxial and avoiding the linear drive device 3 from getting stuck and causing the moving electrode 5 to be unable to swing freely; after welding is completed, the linear drive device 3 drives the connecting rod 4 of the electrode 5 and the moving electrode 5 to move towards the workpiece. As electrode 5 moves away from stationary electrode 21, electrode connecting rod 4 moves away from stationary electrode 21, causing top rod 95 to press against reset block 94. Reset block 94 presses reset column 92 through reset inclined surface 941, thereby causing reset column 92 to move away from the axis of linear drive device 3, thus correcting and resetting linear drive device 3 which has swung outward during welding. Electrode connecting rod 4 is reset to its initial position through guide groove 11 or pushing mechanism 8, so that electrode connecting rod 4 and moving electrode 5 at the lower end of linear drive device 3 are in an initial coaxial state with stationary electrode 21 which is not subjected to clamping force.

[0060] It should be noted that the drive components consisting of the drive motor 32 and the drive screw 33 in the linear drive device 3 can also be replaced by a pneumatic cylinder, a hydraulic cylinder, or an electric cylinder.

[0061] A welding clamping device is disclosed, which clamps and welds workpieces using a C-type resistance welding clamp. The C-type resistance welding clamp includes a fixed plate 1 and a stationary arm 2 fastened to one end of the fixed plate 1. A stationary electrode 21 is provided at one end of the stationary arm 2. A linear drive device 3 is clamped at one end of the fixed plate 1. A moving electrode 5 is provided at the end of the linear drive device 3 away from the drive motor. The moving electrode 5 and the stationary electrode 21 are used to clamp and weld the workpiece. When the linear drive device 3 drives the moving electrode 5 to clamp and weld the workpiece, the moving electrode 5 and the fixed plate 1 are switched to a rotatable support state. During welding, the moving electrode 5 swings with the workpiece under the action of the welding clamping force to maintain coaxiality with the stationary electrode 21. Before welding, the moving electrode 5 is coaxial with the stationary electrode 21, which is not compressed. This ensures that the moving electrode 5 remains coaxial with the stationary electrode 21 before it comes into contact with the workpiece and is pressurized. During the welding pressurization process, the moving electrode 5 changes to a rotatable support state. When the moving electrode 5 is pressurized, the stationary electrode 21 is deflected away from the moving electrode 5 by the top clamping force of the moving electrode 5. During the deflection process, the deflection force is transmitted to the moving electrode 5, causing the rotatable moving electrode 5 to deflect synchronously with the deflection of the stationary electrode 21. This ensures that the moving electrode 5 and the stationary electrode 21 remain coaxial during the welding pressurization process.

[0062] The technical solution of this application, such as Figure 13-14 As shown, when welding a nut to a plate, the linear drive device 3 on the welding clamp drives the electrode connecting rod 4 downward, and the electrode connecting rod 4 drives the moving electrode 5 to move downward linearly to above the stationary electrode 21. At this time, the moving electrode 5 and the stationary electrode 21 are initially coaxial. During welding, the moving electrode 5, the electrode connecting rod 4, and the linear drive device 3 are in a free swinging state in the vertical axial direction. When pressure is applied for welding, the stationary electrode 21 is subjected to welding pressure transmitted to the stationary arm 2. The stationary arm 2 undergoes bending deformation, causing the welding end face of the stationary electrode 21 to deflect. The welding plate 10, which is in contact with the welding end face of the welding stationary electrode 21, deflects, thereby generating a deflection component force between the welding nut 101 and the plate 10. Under the action, the moving electrode 5 in contact with the welding nut 101 generates a deflection force, causing the moving electrode 5, electrode connecting rod 4, and linear drive device 3, which are in a free swinging state, to deflect, thereby maintaining the pressure welding process. The moving electrode 5 and the stationary electrode 21 deflect synchronously to maintain coaxiality, so that the welding nut 101 and the plate 10 are kept in close contact, avoiding the welding angle between the moving electrode 5 and the stationary electrode 21, reducing welding quality problems caused by non-parallelism between workpieces, avoiding the problem that the welding nut 101 and the plate 10 are not parallel, resulting in the welding leg not being firmly welded and the skewing with the plate 10 affecting assembly, and avoiding phenomena such as spatter, uneven weld nugget, and weak welding caused by the angle between the welding contact surfaces of the workpieces.

[0063] The parts not covered in this technical solution can be implemented using existing technologies.

[0064] The foregoing has shown and described the basic principles, main features, and characteristics of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model includes the appended claims and their equivalents.

Claims

1. A welding clamping device, characterized in that: The device includes a fixed plate (1) and a stationary arm (2) fixedly connected to the fixed plate (1). The fixed plate (1) is clamped and fixed on both sides of the stationary arm (2). A stationary electrode (21) is fixedly connected to the end of the stationary arm (2) away from the fixed plate (1). A linear drive device (3) is clamped between the fixed plates (1). An electrode connecting rod (4) is connected to the drive end of the linear drive device (3). A moving electrode (5) is fixedly connected to the end of the electrode connecting rod (4) away from the linear drive device (3). The moving electrode (5) is arranged opposite to the stationary electrode (21) to clamp and weld the workpiece. A guide pin (41) is fixedly connected to the side wall of the electrode connecting rod (4). A guide groove (11) is provided on the fixing plate (1) along the axial direction of the electrode connecting rod (4). The guide pin (41) is inserted into the guide groove (11). The width of the guide groove (11) near the stationary electrode (21) is greater than the diameter of the guide pin (41) so that there is a floating gap between the guide pin (41) and the guide groove (11) in the welding state. The linear drive device (3) includes a connecting flange (31), and a pin (34) is fixedly connected to the side wall of the connecting flange (31). The pin (34) is arranged perpendicular to the driving direction of the linear drive device (3). An arc groove (12) is provided on the fixing plate (1). The pin (34) is inserted in the arc groove (12). The pin (34) swings along the arc groove (12) during welding so that the moving electrode (5) swings with the workpiece to maintain coaxiality with the stationary electrode (21).

2. The welding clamping device according to claim 1, characterized in that: The linear drive device (3) includes a drive motor (32) and a drive screw (33). The drive motor (32) and the reducer connected to it are mounted on the connecting flange (31). The connecting flange (31) is located inside the fixing plates (1) on both sides. The output end of the drive motor (32) is fixedly connected to the drive screw (33) after speed reduction by the reducer. The drive screw (33) is connected to the drive nut by threaded connection. The drive nut is fixedly connected to the end of the electrode connecting rod (4).

3. The welding clamping device according to claim 1, characterized in that: A first magnet (121) is provided on the side wall of the arc groove (12) away from the moving electrode (5), and a second magnet (122) is provided on the side of the pin (34) away from the moving electrode (5). The first magnet (121) and the second magnet (122) are arranged opposite to each other, and the magnetic poles of the sides of the first magnet (121) and the second magnet (122) that are close to each other are the same to generate magnetic repulsion.

4. The welding clamping device according to claim 1, characterized in that: A floating guide block (6) is fitted onto the electrode connecting rod (4). The floating guide block (6) is located on the side of the guide pin (41) away from the linear drive device (3). A guide hole matching the outer wall of the electrode connecting rod (4) is provided in the floating guide block (6). The electrode connecting rod (4) slides along the guide hole so that the electrode connecting rod (4) slides axially along the floating guide block (6). An eccentric rotating shaft (7) is rotatably connected to the floating guide block (6). The eccentric rotating shaft (7) includes a first round shaft (71) and a second round shaft (72) eccentrically fixed at both ends of the first round shaft (71). The first round shaft (71) is rotatably connected to the floating guide block (6), and the second round shaft (72) is rotatably connected to the fixing plate (1). A limiting groove (13) is provided on the inner side of the fixing plate (1), and the floating guide block is located in the limiting groove (13).

5. The welding clamping device according to claim 4, characterized in that: A fourth magnet (14) is fixedly connected to the side wall of the limiting groove (13) away from the eccentric rotating shaft (7), and a fifth magnet (15) is provided at the end of the floating guide block (6) away from the eccentric rotating shaft (7). The fifth magnet (15) and the fourth magnet (14) are arranged opposite to each other and have different magnetic poles at their close ends.

6. The welding clamping device according to claim 1, characterized in that: The guide groove (11) has a first guide section (111) and a second guide section (112). The second guide section (112) is located at the end of the first guide section (111) near the moving electrode (5). The side wall of the first guide section (111) near the stationary arm (2) is flush with the side wall of the second guide section (112) near the stationary arm (2) and parallel to the axis of the electrode connecting rod (4). The groove width of the first guide section (111) is consistent with the outer diameter of the guide pin (41) to guide the guide pin (41). The groove width of the second guide section (112) is greater than the outer diameter of the guide pin (41) so that the guide pin (41) has a free movement gap in the second guide section (112).

7. The welding clamping device according to claim 1, characterized in that: A pushing mechanism (8) is provided on one side of the fixed plate (1). The pushing mechanism (8) includes a second driving device (81). The driving end of the second driving device (81) is connected to a driving abutment block (82). The abutment block (82) is located on the side of the electrode connecting rod (4) away from the fixed plate (1). The abutment block (82) is located inside the fixed plate (1) and slides in cooperation with the fixed plate (1).

8. The welding clamping device according to claim 1, characterized in that: It also includes a reset mechanism, which includes a third magnet (91) located on one side of the linear drive device (3). The third magnet (91) is fixedly connected to the fixing plate (1) and is used to adsorb the metal shell of the linear drive device (3) to assist in the reset of the linear drive device (3).

9. A welding clamping device according to claim 1, characterized in that: It also includes a reset mechanism, which includes a reset column (92) fixed on the connecting flange (31), a mounting plate (93) fixedly connected to the fixing plate (1), a through hole on the mounting plate (93), a reset block (94) slidably connected in the through hole, the reset block (94) being located on the side of the reset column (92) closer to the axis of the linear drive device (3), a reset inclined surface (941) being provided on the end of the reset block (94) facing the reset column (92), a top rod (95) being fixedly connected to the electrode connecting rod (4), the end of the top rod (95) away from the moving electrode (5) facing the reset block (94), when the linear drive device (3) drives the electrode connecting rod (4) to move towards the end of the linear drive device (3), it drives the top rod (95) to push the reset block (94) towards the reset column (92), so that the reset inclined surface (941) squeezes the reset column (92), thereby resetting and straightening the tilted linear drive device (3).

10. A welding clamping device according to claim 9, characterized in that: A baffle (96) is fixedly connected to the end of the reset block (94) away from the reset post (92). A compression spring (97) is provided on the outside of the reset block (94). The compression spring (97) is located between the mounting plate (93) and the baffle (96). The elastic force of the compression spring (97) causes the push rod (95) to push the reset block (94) away from the reset post (92) when it moves away from the reset block (94), thereby making the linear drive device (3) free to swing.

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