Indirect dotting method

Abstract

The invention relates to the technical field of spot welding, and discloses an indirect dotting method which comprises the steps that a current-conducting plate is movably arranged on a welding positioning clamp and can slide up and down; a to-be-welded part is clamped between the upper conductive plate and the lower conductive plate; an electrode tip of a welding gun is connected with the current-conducting plate; and starting the welding gun, electrifying the current-conducting plate, and carrying out spot welding on the to-be-welded part. During indirect dotting operation, the welding positioning clamp is adopted, the to-be-welded part is clamped between the upper conductive plate and the lower conductive plate, the to-be-welded part is fixed, the conductive plates are accurately positioned, and it can be ensured that the conductive plates are tightly attached to the to-be-welded part; the current-conducting plate is elastically connected to the welding positioning clamp and can slide up and down, the current-conducting plate returns to the same position each time under the action of resilience force of the elastic piece and is tightly attached to the to-be-welded piece, the position deviation before and after welding is reduced, and the welding precision is guaranteed; meanwhile, compared with a direct welding method, the loss of the electrode tip is reduced, and the use cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of spot welding, and more specifically, to an indirect dotting method. Background Art

[0002] Spot welding is an important welding method. In traditional resistance spot welding, two electrodes are directly clamped on the upper and lower surfaces of the workpiece, and the current passes vertically through the workpiece, directly forming a solder joint at the electrode contact position. In the prior art, for example, a Chinese patent with the publication number CN222492552U discloses a spot welder that is easy to move, adopting a direct welding method. When in use, the welding parts are placed between the two electrodes. During operation, the two electrodes press the workpiece to form a certain contact resistance between the two layers of metal under the pressure of the two electrodes, forming a hot melt joint, so as to perform spot welding. For this kind of welding method, a flat electrode cap is often used. The commonly used spherical electrode cap has a large welding contact area and is easy to wear. In order to ensure the quality, it needs to be frequently ground, and the manufacturing and maintenance costs are relatively high.

[0003] When using the indirect welding method, the electrodes are not directly clamped directly above and below the welding point, but the current is conducted through a conductive plate, so that the solder joint is formed in a certain area of the current path; during the indirect welding process, it is difficult to position the conductive plate. There are slight changes in the position of the conductive plate before and after welding or there are assembly errors in the workpieces to be welded, making it difficult to ensure the close fit between the conductive plate and the workpieces to be welded.

[0004] Therefore, it is necessary to propose an indirect dotting method to at least partially solve the problems existing in the prior art. Summary of the Invention

[0005] A series of simplified concepts are introduced in the Summary of the Invention section, which will be further detailed in the Detailed Description section. The Summary of the Invention section of the present invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the protection scope of the claimed technical solution.

[0006] To at least partially solve the above problems, the present invention provides an indirect dotting method, including:

[0007] A conductive plate is movably arranged on the welding and positioning fixture, and the conductive plate can slide up and down;

[0008] The workpiece to be welded is clamped between the upper and lower conductive plates;

[0009] The electrode head of the welding gun is connected to the conductive plate;

[0010] The welding gun is started and the conductive plate is energized at the same time to perform spot welding on the workpiece to be welded.

[0011] Preferably, the welding positioning fixture includes: a support, a conductive plate, a positioning pin and an elastic member. The positioning pin is installed on the support. The conductive plate is sleeved on the positioning pin and is slidably connected to the positioning pin. The elastic member is sleeved on the positioning pin and is elastically connected to the conductive plate. The axial direction of the positioning pin is the same as the direction of the clamping force.

[0012] Preferably, the support includes: a base, a pressing arm, a first transition plate and a second transition plate. The pressing arm is rotatably connected to the top end of the base, and a first platform is provided on the bottom surface of the pressing arm; one end of the first transition plate is installed on the first platform, a second platform is provided on the side surface of the base, and one end of the second transition plate is installed on the second platform; the first transition plate and the second transition plate are arranged in parallel.

[0013] Preferably, gaskets are provided between the first transition plate and the first platform of the pressing arm, and between the second transition plate and the second platform of the base.

[0014] Preferably, the conductive plate includes an upper conductive plate and a lower conductive plate. The upper conductive plate is in fit connection with the first transition plate, and the lower conductive plate is in fit connection with the second transition plate. The upper conductive plate and the lower conductive plate are respectively located on the upper and lower sides of the workpiece to be welded.

[0015] Preferably, the upper conductive plate and the lower conductive plate have the same structure and are arranged symmetrically up and down. The clamping ends of the upper conductive plate and the lower conductive plate are bent towards the center of the two, and a clamping space for the workpiece to be welded is formed; depressions are provided on the top surface of the clamping end of the upper conductive plate and the bottom surface of the clamping end of the lower conductive plate. The depressions are matched with the electrode heads of the welding torch, and chamfers are provided on the plate edges where the conductive plate is in fit connection with the transition plate.

[0016] Preferably, the positioning pin includes a screw hole, a baffle, a guiding body and a positioning body. The baffle, the guiding body and the positioning body are connected in sequence. The screw hole runs through the centers of the baffle, the guiding body and the positioning body, and a screw passes through the screw hole to install the positioning pin on the transition plate.

[0017] Preferably, a pin hole is provided on the conductive plate. The positioning pin passes through the pin hole and is connected to the transition plate. The elastic member is sleeved on the positioning pin and is connected between the baffle and the conductive plate.

[0018] Preferably, both the positioning body and the guiding body are cylindrical. A conical surface is provided on the side where the positioning body is connected to the guiding body; a conical surface corresponding to the positioning body is provided in the pin hole; there is an assembly gap between the guiding body and the wall of the pin hole, and the positioning body is in tight fit with the wall of the pin hole.

[0019] Preferably, the conductive plate is made of copper, and the conductivity is greater than 80%.

[0020] Preferably, an auxiliary positioning assembly is connected between the second platform of the base and the pressing arm. The auxiliary positioning assembly includes:

[0021] A hinge seat, which is connected to the second platform of the base;

[0022] The stabilizer has its bottom end rotatably connected inside the hinge seat, and its top end is hinged to the pressure arm. The length of the stabilizer is telescopically adjustable. The stabilizer includes a detection part located at the lower part and a telescopic part located at the upper part. The detection part is rotatably connected to the hinge seat.

[0023] Preferably, the telescopic part includes:

[0024] A cylinder body, with a guiding sliding groove penetrating through the side surface of the cylinder body, and an induction groove arranged at the inner bottom of the cylinder body;

[0025] A stable slider, which is slidably connected inside the cylinder body, and its two sides pass through the guiding sliding groove and extend forward and backward to the base respectively. A groove is arranged at the top end of the stable slider;

[0026] A telescopic frame, which is arranged in an L shape. The bottom end of the telescopic frame is connected to the stable slider, and the top end of the telescopic frame is hinged to the pressure arm;

[0027] An adjusting screw rod, which is screwed to the top end of the cylinder body and is coaxially arranged with the cylinder body;

[0028] An adjusting block, which is rotatably connected to the bottom end of the adjusting screw rod and slides on the inner wall of the cylinder body without rotation;

[0029] A pressure regulating spring, one end of which is installed in the groove and the other end is connected to the adjusting block.

[0030] Preferably, an induction block is arranged in the induction groove, and the detection end at the top of the induction block abuts against the stable slider.

[0031] Preferably, the detection part includes:

[0032] A first detection ring, which is connected to the lower part of the cylinder body;

[0033] A first conductive plate, which is concentrically connected to the outside of the first detection ring;

[0034] A second detection ring, which is concentrically arranged outside the first detection ring;

[0035] A second conductive plate, which is concentrically connected to the inside of the second detection ring. A gap is arranged between the second conductive plate and the first conductive plate. The first conductive plate and the second conductive plate are electrically connected to the controller;

[0036] A tension spring assembly, which is arranged in two groups. The two groups of tension spring assemblies are respectively connected between the top of the second detection ring and the cylinder body, and between the bottom of the second detection ring and the cylinder body. The two groups of tension spring assemblies include a plurality of tension springs arranged along the circumferential direction, and each tension spring is inclined;

[0037] A counterweight block, which is arranged inside the first detection ring and the second detection ring;

[0038] The support ring is concentrically connected to the outside of the second detection ring. Hinge shafts are provided at the front and rear of the support ring, and the hinge shafts are rotatably connected to the hinge holes at the front and rear of the hinge seats.

[0039] Compared with the prior art, the present invention has at least the following beneficial effects:

[0040] The present invention provides an indirect dotting method. When spot welding, an indirect dotting method is adopted. The current flows into from one electrode head of the welding torch, is conducted to the position to be welded on the workpiece through the conductive plate, and then flows out from the other electrode head of the welding torch to form a solder joint. During the indirect dotting operation, a welding positioning fixture is used to clamp the workpiece to be welded between the upper and lower conductive plates for fixing the workpiece to be welded. The conductive plates are accurately positioned and can ensure close fitting between the conductive plates and the workpiece to be welded; the conductive plates are elastically connected to the welding positioning fixture and can slide up and down. Under the action of the resilience of the elastic member, the conductive plates return to the same position each time and are in close contact with the workpiece to be welded, reducing the position deviation before and after welding and ensuring the welding precision; at the same time, compared with the direct welding method, the loss of the electrode head is reduced and the use cost is lowered.

[0041] For the indirect dotting method described in the present invention, other advantages, objectives, and features of the present invention will be partially reflected by the following description and partially understood by those skilled in the art through the research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0043] Figure 1 is a schematic structural diagram of the indirect dotting device in the present invention;

[0044] Figure 2 is a schematic structural diagram of the welding positioning fixture in the present invention;

[0045] Figure 3 is a front view of the welding positioning fixture in the present invention;

[0046] Figure 4 is a schematic cross-sectional structural diagram of the upper part of the welding positioning fixture in the present invention;

[0047] Figure 5 For the present invention Figure 4 is a partial enlarged structural diagram at A in the present invention;

[0048] Figure 6 is a schematic structural diagram of the positioning pin in the present invention;

[0049] Figure 7 is a schematic installation structural diagram of the auxiliary positioning component in the present invention;

[0050] Figure 8 This is a schematic cross-sectional structure diagram of the auxiliary positioning component in the present invention;

[0051] Figure 9 This is a schematic cross-sectional structure diagram of the upper part of the auxiliary positioning component in the present invention;

[0052] Figure 10 This is a schematic cross-sectional structure diagram of the lower part of the auxiliary positioning component in the present invention;

[0053] Figure 11 This is a schematic structure diagram of the cylinder in the present invention.

[0054] In the figure: 100. Welding positioning fixture; 10. Support; 11. Base; 12. Pressing arm; 13. First transition plate; 14. Second transition plate; 15. Gasket; 20. Positioning pin; 21. Screw hole; 22. Baffle; 23. Guide body; 24. Positioning body; 30. Conductive plate; 31. Upper conductive plate; 32. Lower conductive plate; 33. Depression; 34. Pin hole; 35. Chamfer; 40. Elastic member; 200. Workpiece to be welded; 300. Welding torch; 400. Hinge seat; 41. Cylinder; 42. Guide chute; 43. Induction groove; 44. Stable slider; 45. Groove; 46. Telescopic frame; 47. Adjusting screw; 48. Adjusting block; 49. Pressure regulating spring; 410. Induction block; 411. First detection ring; 412. First conductive plate; 413. Second detection ring; 414. Second conductive plate; 415. Tension spring assembly; 416. Counterweight; 417. Support ring; 418. Hinge shaft. Detailed implementation manners

[0055] The following further elaborates on the present invention in conjunction with the accompanying drawings and embodiments, so that those skilled in the art can implement it with reference to the text of the specification.

[0056] It should be understood that terms such as "having", "comprising", and "including" as used herein do not exclude the presence or addition of one or more other elements or their combinations.

[0057] Embodiment 1:

[0058] As Figures 1 - 6 shown, the present invention provides an indirect dotting method, including:

[0059] The conductive plate 30 is movably arranged on the welding positioning fixture 100, and the conductive plate 30 can slide up and down;

[0060] The workpiece to be welded 200 is clamped between the upper and lower conductive plates 30;

[0061] The electrode head of the welding torch 300 is connected to the conductive plate 30;

[0062] Start the welding torch 300 to energize the conductive plate 30 simultaneously, and perform spot welding on the workpiece to be welded 200.

[0063] The working principle and beneficial effects of the above technical solution are as follows:

[0064] The present invention provides an indirect dotting method. When performing spot welding, an indirect dotting method is adopted. The current flows into from one electrode head of the welding torch 300, is conducted to the position where the workpiece needs to be welded through the conductive plate 30, and then flows out from the other electrode head of the welding torch 300 to form a solder joint. During the indirect dotting operation, a welding positioning fixture 100 is used to clamp the workpiece to be welded 200 between the upper and lower conductive plates 30 to fix the workpiece to be welded 200. The conductive plate 30 is accurately positioned and can ensure close fit between the conductive plate 30 and the workpiece to be welded 200; the conductive plate 30 is elastically connected to the welding positioning fixture 100 and can slide up and down. Under the action of the resilience of the elastic member, the conductive plate 30 returns to the same position each time and closely fits with the workpiece to be welded 200, reducing the position deviation before and after welding and ensuring the welding accuracy; at the same time, compared with the direct welding method, the loss of the electrode head is reduced and the use cost is lowered.

[0065] Embodiment 2:

[0066] Based on the above Embodiment 1, the welding positioning fixture 100 includes: a support 10, a conductive plate 30, a positioning pin 20, and an elastic member 40. The positioning pin 20 is installed on the support 10, the conductive plate 30 is sleeved on the positioning pin 20 and is slidably connected to the positioning pin 20, the elastic member 40 is sleeved on the positioning pin 20 and is elastically connected to the conductive plate 30, and the axial direction of the positioning pin 20 is the same as the direction of the clamping force.

[0067] The working principle and beneficial effects of the above technical solution are as follows:

[0068] In the welding positioning fixture 100, the support 10 serves as the main supporting component for fixing the positioning pin 20. The positioning pin 20 is connected to the conductive plate 30 through the elastic member 40, enabling the conductive plate 30 to slide along the positioning pin 20 under the action of the elastic force of the elastic member 40; and the axial direction of the positioning pin 20 is the same as the direction of the clamping force, making the moving direction of the conductive plate 30 consistent with the clamping direction. The conductive plate 30 can move and reset along the clamping direction, reducing the resistance during the movement of the conductive plate 30.

[0069] Embodiment 3:

[0070] Based on the above-mentioned Embodiment 2, the support 10 includes: a base 11, a pressing arm 12, a first transition plate 13 and a second transition plate 14. The pressing arm 12 is rotatably connected to the top of the base 11, and a first platform is provided on the bottom surface of the pressing arm 12; one end of the first transition plate 13 is mounted on the first platform, a second platform is provided on the side surface of the base 11, and one end of the second transition plate 14 is mounted on the second platform; the first transition plate 13 and the second transition plate 14 are arranged in parallel.

[0071] Gaskets 15 are provided between the first transition plate 13 and the first platform of the pressing arm 12, and between the second transition plate 14 and the second platform of the base 11.

[0072] The conductive plate 30 includes an upper conductive plate 31 and a lower conductive plate 32. The upper conductive plate 31 is adhesively connected to the first transition plate 13, the lower conductive plate 32 is adhesively connected to the second transition plate 14, and the upper conductive plate 31 and the lower conductive plate 32 are respectively located on the upper and lower sides of the workpiece to be welded 200.

[0073] The conductive plate 30 is made of copper, and its conductivity is greater than 80%.

[0074] The working principle and beneficial effects of the above technical solution are as follows:

[0075] A fixed second platform is provided on the side surface of the support 10 to support the second transition plate 14, and a first platform is rotatably provided on the top surface of the support 10 to support the first transition plate 13; when the workpiece to be welded 200 is clamped, the pressing arm 12 is rotated upward to separate the first transition plate 13 from the second transition plate 14, and the workpiece to be welded 200 is placed on the lower conductive plate 32; then the pressing arm 12 is rotated in the reverse direction to make the first transition plate 13 and the second transition plate 14 correspond up and down. At this time, the upper conductive plate 31 and the lower conductive plate 32 correspond up and down, and the workpiece to be welded 200 is clamped and fixed up and down, which is convenient for the quick clamping of the workpiece to be welded 200.

[0076] Embodiment 4:

[0077] Based on the above-mentioned Embodiment 3, the upper conductive plate 31 and the lower conductive plate 32 have the same structure and are arranged symmetrically up and down. The clamping ends of the upper conductive plate 31 and the lower conductive plate 32 are bent towards the centers of the two, and a clamping space for the workpiece to be welded 200 is formed; depressions 33 are provided on the top surface of the clamping end of the upper conductive plate 31 and the bottom surface of the clamping end of the lower conductive plate 32. The depressions 33 cooperate with the electrode heads of the welding torch 300, and chamfers 35 are provided on the plate edges where the conductive plate 30 is attached to the transition plate.

[0078] The working principle and beneficial effects of the above technical solution are as follows:

[0079] The clamping ends of the upper conductive plate 31 and the lower conductive plate 32 are bent towards the centers of the two to form corresponding upper and lower clamping surfaces, and the area of the clamping surfaces is small, which is convenient for accurately positioning the dotting position. The recess 33 cooperates with the electrode head of the welding torch 300, improving the matching accuracy between the conductive plate 30 and the electrode head, reducing the assembly error of the electrode head, and improving the welding quality.

[0080] Embodiment 5:

[0081] Based on the above Embodiment 4, the positioning pin 20 includes a screw hole 21, a baffle 22, a guiding body 23 and a positioning body 24. The baffle 22, the guiding body 23 and the positioning body 24 are connected in sequence. The screw hole 21 is disposed through the centers of the baffle 22, the guiding body 23 and the positioning body 24, and a screw passes through the screw hole 21 to install the positioning pin 20 on the transition plate.

[0082] A pin hole 34 is provided on the conductive plate 30. The positioning pin 20 passes through the pin hole 34 and is connected to the transition plate. The elastic member 40 is sleeved on the positioning pin 20 and connected between the baffle 22 and the conductive plate 30.

[0083] Both the positioning body 24 and the guiding body 23 are cylindrical. A tapered surface is provided on one side where the positioning body 24 is connected to the guiding body 23; a tapered surface corresponding to the positioning body 24 is provided in the pin hole 34; there is an assembly gap between the guiding body 23 and the wall of the pin hole 34, and the positioning body 24 is in close fit with the wall of the pin hole 34.

[0084] The working principle and beneficial effects of the above technical solution are as follows:

[0085] The conductive plate 30 is slidably disposed on the positioning pin 20. There is an assembly gap between the guiding body 23 and the wall of the pin hole 34, ensuring that the conductive plate 30 can move up and down along the guiding body; the positioning body 24 is in close fit with the wall of the pin hole 34, and a tapered surface is provided on the positioning body 24. When the conductive plate 30 has a position deviation during the sliding process, under the resilience of the elastic member 40, the pin hole 34 of the conductive plate 30 moves along the tapered surface of the guiding body 23 until the conductive plate 30 returns to the same position. Through the above structural design, the problem that it is difficult to position the conductive plate 30 during the welding process, the position of the conductive plate 30 changes slightly before and after welding, or there is an assembly error in the workpiece to be welded is solved, ensuring that the conductive plate 30 and the workpiece to be welded 200 always remain in close contact.

[0086] Embodiment 6:

[0087] As Figures 7 - 11 shown, based on the above Embodiment 3, an auxiliary positioning assembly is connected between the second platform of the base 11 and the pressing arm 12. The auxiliary positioning assembly includes:

[0088] A hinge seat 400, which is connected to the second platform of the base 11;

[0089] The stabilizer has its bottom end rotatably connected to the hinge seat 400, and its top end is hinged to the pressing arm 12. The length of the stabilizer is telescopically adjustable. The stabilizer includes a detection part located at the lower part and a telescopic part located at the upper part. The detection part is rotatably connected to the hinge seat 400.

[0090] The working principle and beneficial effects of the above technical solution are as follows:

[0091] During the use of the welding positioning fixture, it is necessary to rotate the pressing arm 12 so that the first transition plate 13 and the second transition plate 14 are vertically aligned. By providing an auxiliary positioning component, a hinge seat 400 is provided on the second platform, and a stabilizer is provided within the hinge seat 400. When the pressing arm 12 rotates, it pulls the stabilizer to extend or contract, and at the same time rotates around the hinge seat 400, making the rotation process of the pressing arm 12 stable. At the same time, it ensures that the pressing arm 12 does not shift after positioning is completed, ensuring the position states of the first transition plate 13 and the second transition plate 14, and thus ensuring the positioning accuracy of the conductive plate 30. The telescopic part at the upper part of the stabilizer is used to realize the extension or contraction of the stabilizer, and the detection part at the lower part of the stabilizer can detect the position state of the pressing arm 12, providing a basis for the pressing arm 12 to rotate in place and for deviation conditions.

[0092] Embodiment 7:

[0093] Based on the above Embodiment 6, the telescopic part includes:

[0094] A cylinder body 41, with a guiding chute 42 penetrating through the side surface of the cylinder body 41;

[0095] A stable slider 44, slidably connected within the cylinder body 41, and extending forward and backward from both sides through the guiding chute 42 to the base 11 respectively; a groove 45 is provided at the top end of the stable slider 44;

[0096] A telescopic frame 46, arranged in an L shape, with the bottom end of the telescopic frame 46 connected to the stable slider 44, and the top end of the telescopic frame 46 hinged to the pressing arm 12;

[0097] An adjusting screw 47, screwed onto the top end of the cylinder body 41, and the adjusting screw 47 is coaxially arranged with the cylinder body 41;

[0098] An adjusting block 48, rotatably connected to the bottom end of the adjusting screw 47, and the adjusting block 48 slides on the inner wall of the cylinder body 41 without rotation;

[0099] A pressure regulating spring 49, with one end installed in the groove 45 and the other end connected to the adjusting block 48.

[0100] The working principle and beneficial effects of the above technical solution are as follows:

[0101] When the pressing arm 12 rotates upward, it pulls the telescopic frame 46 to move upward. The telescopic frame 46 drives the stable slider 44 to slide within the cylinder body 41, and the guiding chute 42 guides the stable slider 44. During the movement of the stable slider 44, the pressure regulating spring 49 is compressed. Under the elastic force of the spring, the telescopic frame 46 is always kept in a tensioned state, that is, the pressing arm 12 is always kept in a tensioned state during the rotation process. At the same time, as the pressing arm 12 rotates to drive the telescopic frame 46 to rotate, the detection part at the lower part of the cylinder body 41 also rotates accordingly, realizing the flexible adjustment of the state of the pressing arm 12. On the contrary, when the pressing arm 12 rotates in reverse, under the elastic force of the pressure regulating spring 49, the stable slider 44 is pushed to quickly reset downward, and the pressing arm 12 is pulled to reset through the telescopic frame 46, so that the first transition plate 13 and the second transition plate 14 can be quickly positioned to the upper and lower corresponding states, ensuring accurate positioning and clamping.

[0102] An adjusting screw 47 is arranged on the cylinder body 41. By rotating the adjusting screw 47, the adjusting block 48 is driven to move. The adjusting block 48 squeezes the pressure regulating spring 49 and changes the initial length of the pressure regulating spring 49, thereby adjusting the elastic force of the pressure regulating spring 49 to adapt to the clamping requirements of different workpieces to be welded 200. While ensuring the stable clamping of the workpiece to be welded 200, the surface damage of the workpiece to be welded 200 is reduced through the adjustment of the clamping force.

[0103] Through the above structural design, the telescopic frame 46 connected elastically tightens the pressing arm 12, so that the pressing arm 12 is always kept in a tensioned state during the rotation process. When positioning and clamping the workpiece to be welded 200, under the elastic force, the workpiece to be welded 200 is kept in a pressed state, and the pressing force can be adjusted through the adjusting screw 47 to adapt to the clamping force requirements of workpieces to be welded 200 with different sizes and weights, improving the adaptability of the device.

[0104] Embodiment 8:

[0105] On the basis of the above Embodiment 7, an induction groove 43 is arranged at the inner bottom of the cylinder body 41, and an induction block 410 is arranged in the induction groove 43. The detection end at the top of the induction block 410 abuts against the stable slider 44.

[0106] The working principle and beneficial effects of the above technical solution are as follows:

[0107] The induction block 410 is arranged in the induction groove 43, and the top of the induction block 410 is the detection end. When positioning and clamping the workpiece to be welded 200 and the pressing arm 12 rotates in place, the stable slider 44 is located at the bottommost end of the guiding chute 42. The stable slider 44 contacts the detection end of the induction block 410, causing the induction block 410 to be triggered and send a in-place signal to the controller, indicating that the pressing arm 12 has rotated in place, serving as the basis for starting the welding operation.

[0108] Embodiment 9:

[0109] Based on the above-mentioned Embodiment 8, the detection unit includes:

[0110] A first detection ring 411, which is connected to the lower part of the cylinder body 41;

[0111] A first conductive plate 412, which is concentrically connected to the outside of the first detection ring 411;

[0112] A second detection ring 413, which is concentrically arranged outside the first detection ring 411;

[0113] A second conductive plate 414, which is concentrically connected to the inside of the second detection ring 413. There is a gap between the second conductive plate 414 and the first conductive plate 412. The first conductive plate 412 and the second conductive plate 414 are electrically connected to the controller;

[0114] A spring assembly 415, which is provided in two groups. The two groups of spring assemblies 415 are respectively connected between the top of the second detection ring 413 and the cylinder body 41, and between the bottom of the second detection ring 413 and the cylinder body 41; The two groups of spring assemblies 415 include a plurality of springs arranged along the circumferential direction, and each spring is inclined;

[0115] A counterweight 416, which is arranged inside the first detection ring 411 and the second detection ring 413;

[0116] A support ring 417, which is concentrically connected to the outside of the second detection ring 413. Hinge shafts 418 are arranged in front and behind the support ring 417, and the hinge shafts 418 are rotatably connected to the hinge holes in front and behind the hinge seat 400.

[0117] The working principle and beneficial effects of the above technical solution are:

[0118] When detecting, the second detection ring 413 maintains a stable state under the elastic force of the tension spring assembly 415. The elastic forces of the multiple tension springs in the tension spring assembly are equal and the lengths are equal, so that the second detection ring 413 and the first detection ring 411 are coaxial. When the cylinder body 41 rotates, the second detection ring 413 deflects slightly and rotates with the cylinder body 41. The hinge shaft 418 on the support ring 417 rotates relative to the hinge seat 400, thereby realizing the flexible rotation of the pressing arm 12. When the clamping is in place, if it is in a normal clamping state, under the action of the tension spring assembly 415, the second detection ring 413 is balanced in force in all directions, so that the cylinder body 41 and the first detection ring 411 inside it are in a neutral state, and a preset gap is maintained between the first conductive plate 412 and the second conductive plate 414 without contact. When the clamping position of the pressing arm 12 deviates, it will cause the cylinder body 41 and the first detection ring 411 to deviate from the neutral state, that is, a deflection angle is generated between the axes of the first conductive plate 412 and the second conductive plate 414. After the deflection exceeds the preset value, the first conductive plate 412 and the second conductive plate 414 come into contact, and the current is conducted after passing through the first conductive plate 412 and the second conductive plate 414. The controller detects the electrical signal, indicating that the position of the pressing arm 12 has deviated and needs to be repaired.

[0119] Through the above structural design, a detection part is arranged at the lower part of the stabilizer. By using two sets of tension spring assemblies 415, the first detection ring 411 and the second detection ring 413 are flexibly connected and a preset gap is maintained. The tension spring assembly 415 is used in cooperation with the pressure regulating spring 49, which improves the rotation stability and clamping and positioning effect of the pressing arm 12. When the pressing arm 12 rotates upward, the state of the pressing arm 12 is detected by the induction block 410, indicating that the pressing arm 12 is not clamped in place at this time. The controller does not process the electrical signal states of the first conductive plate 412 and the second conductive plate 414, that is, this is a state where detection is not required at this time. When the pressing arm 12 rotates in place, the clamping-in-place state of the pressing arm 12 is detected by the induction block 410, and the controller processes the electrical signal states of the first conductive plate 412 and the second conductive plate 414 at this time, that is, this is a detection state at this time. At this time, when an electrical signal is generated between the first conductive plate 412 and the second conductive plate 414, it indicates that after the cylinder body 41 moves in place, there is an angular deviation between the axes of the first detection ring 411 and the second detection ring 413, that is, there is an angular deviation of the pressing arm 12 relative to the preset position. At this time, the upper and lower conductive plates 30 are not completely aligned, resulting in a positioning deviation. It can identify the state where the pressing arm 12 is inaccurately positioned after long-term use, which is convenient for repair. On the other hand, during the welding process, as the welding position of the workpiece to be welded 200 changes, the center of gravity of the workpiece to be welded 200 also changes accordingly. The elastically arranged conductive plate 30 shakes, acting on the pressing arm 12 to make it shake. Through the axis change of the first detection ring 411 and the second detection ring 413, the shaking condition of the pressing arm 12 can also be detected, which is convenient for real-time monitoring of the stable state of the pressing arm 12.

[0120] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 should not be construed as a limitation on the present invention.

[0121] In the present invention, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0122] Although the embodiments of the present invention have been disclosed as above, they are not limited to only the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the examples shown and described here.

Claims

1. An indirect dotting method, characterized in that, Including: A conductive plate (30) is movably arranged on the welding positioning fixture (100), and the conductive plate (30) can slide up and down; The workpiece to be welded (200) is clamped between the upper and lower conductive plates (30); The electrode head of the welding gun (300) is connected to the conductive plate (30); The welding gun (300) is started to energize the conductive plate (30) at the same time, and spot welding is performed on the workpiece to be welded (200); The welding positioning fixture (100) includes: a support (10), a conductive plate (30), a positioning pin (20) and an elastic member (40). The positioning pin (20) is installed on the support (10), the conductive plate (30) is sleeved on the positioning pin (20) and is slidably connected to the positioning pin (20), the elastic member (40) is sleeved on the positioning pin (20) and is elastically connected to the conductive plate (30), and the axial direction of the positioning pin (20) is the same as the direction of the clamping force; The support (10) includes a base (11) and a pressing arm (12), and the pressing arm (12) is rotatably connected to the top of the base (11); An auxiliary positioning assembly is connected between the base (11) and the pressing arm (12), and the auxiliary positioning assembly includes: A hinge seat (400), and the hinge seat (400) is connected to the base (11); A stabilizing frame, the bottom end of the stabilizing frame is rotatably connected in the hinge seat (400), the top end is hinged to the pressing arm (12), and the length of the stabilizing frame is telescopically arranged; the stabilizing frame includes: a detection part located at the lower part and a telescopic part located at the upper part; the detection part is rotatably connected to the hinge seat (400); the detection part is used for detecting the position state of the pressing arm (12).

2. The indirect dotting method according to claim 1, wherein The support (10) further includes: a first transition plate (13) and a second transition plate (14). A first platform is arranged on the bottom surface of the pressing arm (12), and one end of the first transition plate (13) is installed on the first platform; a second platform is arranged on the side surface of the base (11), and one end of the second transition plate (14) is installed on the second platform; the first transition plate (13) and the second transition plate (14) are arranged in parallel; gaskets (15) are provided between the first transition plate (13) and the first platform of the pressing arm (12), and between the second transition plate (14) and the second platform of the base (11).

3. An indirect dotting method according to claim 2, characterized in that, The conductive plate (30) includes an upper conductive plate (31) and a lower conductive plate (32). The upper conductive plate (31) is attached and connected to the first transition plate (13), the lower conductive plate (32) is attached and connected to the second transition plate (14), and the upper conductive plate (31) and the lower conductive plate (32) are respectively located on the upper and lower sides of the workpiece to be welded (200).

4. An indirect dotting method according to claim 3, characterized in that, The upper conductive plate (31) and the lower conductive plate (32) have the same structure and are arranged symmetrically up and down. The clamping ends of the upper conductive plate (31) and the lower conductive plate (32) are bent towards the center of the two, and a clamping space for the workpiece to be welded (200) is formed; depressions (33) are provided on the top surface of the clamping end of the upper conductive plate (31) and the bottom surface of the clamping end of the lower conductive plate (32), the depressions (33) are matched with the electrode head of the welding gun (300), and chamfers (35) are provided on the plate edges where the conductive plate (30) is attached to the transition plate.

5. An indirect dotting method according to claim 3, characterized in that, The positioning pin (20) includes a screw hole (21), a baffle (22), a guiding body (23) and a positioning body (24). The baffle (22), the guiding body (23) and the positioning body (24) are connected in sequence. The screw hole (21) runs through the centers of the baffle (22), the guiding body (23) and the positioning body (24). A screw passes through the screw hole (21) to install the positioning pin (20) on the transition plate.

6. An indirect dotting method according to claim 5, characterized in that, A pin hole (34) is provided on the conductive plate (30). The positioning pin (20) passes through the pin hole (34) to be connected to the transition plate. An elastic member (40) is sleeved on the positioning pin (20) and connected between the baffle (22) and the conductive plate (30); Both the positioning body (24) and the guiding body (23) are cylindrical. A tapered surface is provided on the side where the positioning body (24) is connected to the guiding body (23); a tapered surface corresponding to the positioning body (24) is provided in the pin hole (34); there is an assembly gap between the guiding body (23) and the wall of the pin hole (34), and the positioning body (24) is in close fit with the wall of the pin hole (34).

7. An indirect dotting method according to claim 1, characterized in that, The telescopic part includes: A cylinder body (41), and a guiding chute (42) runs through the side surface of the cylinder body (41); A stable slider (44), which is slidably connected inside the cylinder body (41), and both sides pass through the guiding chute (42) and extend forward and backward to the base (11) respectively; a groove (45) is provided at the top of the stable slider (44); A telescopic frame (46), which is arranged in an L shape. The bottom end of the telescopic frame (46) is connected to the stable slider (44), and the top end of the telescopic frame (46) is hinged to the pressing arm (12); An adjusting screw (47), which is screwed to the top end of the cylinder body (41); An adjusting block (48), which is rotatably connected to the bottom end of the adjusting screw (47). The adjusting block (48) slides on the inner wall of the cylinder body (41) without rotation; A pressure regulating spring (49), one end of which is installed in the groove (45), and the other end is connected to the adjusting block (48).

8. An indirect dotting method according to claim 7, characterized in that, An induction groove (43) is provided at the inner bottom of the cylinder body (41), and an induction block (410) is provided in the induction groove (43). The detection end at the top of the induction block (410) abuts against the stable slider (44).

9. An indirect dotting method according to claim 8, characterized in that, The detection part includes: A first detection ring (411), which is connected to the lower part of the cylinder body (41); A first conductive plate (412), which is concentrically connected to the outside of the first detection ring (411); A second detection ring (413), which is concentrically arranged outside the first detection ring (411); A second conductive plate (414), which is concentrically connected to the inside of the second detection ring (413). A gap is provided between the second conductive plate (414) and the first conductive plate (412). The first conductive plate (412) and the second conductive plate (414) are electrically connected to the controller.

10. An indirect dotting method according to claim 9, characterized in that, The detection part further includes: Tension spring assembly (415), the tension spring assembly (415) is provided in two groups, and the two groups of tension spring assemblies (415) are respectively connected between the top of the second detection ring (413) and the cylinder body (41), and between the bottom of the second detection ring (413) and the cylinder body (41); a plurality of tension springs arranged along the circumferential direction are included in the two groups of tension spring assemblies (415), and each tension spring is arranged obliquely; Counterweight block (416), the counterweight block (416) is arranged inside the first detection ring (411) and the second detection ring (413); Support ring (417), the support ring (417) is concentrically connected to the outside of the second detection ring (413), hinge shafts (418) are arranged at the front and rear of the support ring (417), and the hinge shafts (418) are rotatably connected to the hinge holes at the front and rear of the hinge seat (400).

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