A high-efficiency welding positioning system, method, and positioning fixture for welding automotive seats.

Abstract

This invention provides a novel high-efficiency welding positioning system, method, and positioning fixture for automotive seat welding. The system includes a base and several positioning units. Each positioning unit includes a first base, a second base, and a clamping base. The clamping base has a vertically oriented cavity inside, with a steering groove and a descending groove on its inner wall. The top of the descending groove communicates with the bottom of the steering groove. A positioning pin vertically moves through the first base, with a transition pin at its top. The diameter of the transition pin increases as the height decreases, and the diameter of the bottom of the transition pin is equal to the diameter of the positioning pin. A lifting column vertically moves through the clamping base, with its outer wall conforming to the clamping base. A linkage column is located on the side wall of the lifting column, with its free end located within the steering groove or descending groove. A clamping arm is horizontally positioned at the top of the lifting column, with a clamping part at the bottom of the free end of the clamping arm. A power mechanism drives all positioning pins and all lifting columns to move up and down.

Description

Technical Field

[0001] This invention belongs to the field of automotive seat welding technology, and relates to an efficient welding positioning system, method and positioning fixture for automotive seat welding. Background Technology

[0002] Welding, also known as fusion welding, is a manufacturing process and technology that joins metals or other thermoplastic materials such as plastics by heating, high temperature, or high pressure. Modern welding utilizes a variety of energy sources, including gas flames, electric arcs, lasers, electron beams, friction, and ultrasound. Besides its use in factories, welding can be performed in various environments, such as outdoors, underwater, and in space. Regardless of the location, welding can pose dangers to operators, so appropriate protective measures must be taken. Potential injuries from welding include burns, electric shock, vision impairment, inhalation of toxic fumes, and excessive ultraviolet radiation exposure.

[0003] Welding is used in many fields, such as the production of automotive parts. In actual welding, the structure to be welded is first placed on a fixture, and then the upper structure presses it down, creating a contact area at the weld joint. Workers then perform manual welding or automated welding by a robot. After welding, the pressing structure is released, and the entire component can be removed. Summary of the Invention

[0004] The purpose of this invention is to provide a new high-efficiency welding positioning system, method, and positioning fixture for welding automotive seats.

[0005] To achieve the above-mentioned technical effects, the present invention provides a high-efficiency welding positioning system, including a base and a plurality of positioning units disposed on the base, wherein at least two of the positioning units are used to fix a workpiece, and the positioning unit includes:

[0006] The first seat, the second seat, and the pressing seat are provided. The pressing seat has a vertically formed receiving cavity inside. The inner wall of the receiving cavity has a spiral turning groove and a vertical descending groove. The top of the descending groove communicates with the bottom of the turning groove.

[0007] A positioning pin is provided, which moves vertically through the first base. A transition pin is provided at the top of the positioning pin. The diameter of the transition pin increases as the height decreases. The diameter of the bottom of the transition pin is equal to the diameter of the positioning pin.

[0008] A lifting column is provided, which moves vertically through the pressing seat and the outer wall of the lifting column is attached to the pressing seat. A linkage column is provided on the side wall of the lifting column, and the free end of the linkage column is located in the turning groove or the descending groove. A pressing arm is provided horizontally on the top of the lifting column, and a pressing part is provided at the bottom of the free end of the pressing arm.

[0009] The power mechanism is used to drive all the positioning pins and all the lifting columns to move up and down. In the standby state, the clamping arm is located on the side of the first seat and the second seat, and the top of the positioning pin is at the same height as the top of the first seat. In the working state, the clamping part is located between the first seat and the second seat, and the positioning pin is inserted into the pre-drilled hole on the workpiece.

[0010] The present invention is further configured such that the base includes a bottom plate and a top plate located above the bottom plate, a plurality of supporting columns connected to the bottom plate are vertically arranged at the bottom of the top plate, the positioning pin and the lifting column both move through the top plate, the power mechanism is located between the bottom plate and the top plate, and the first seat body, the second seat body and the pressing seat body are all located on the top plate.

[0011] The invention is further configured to include a first frame and a second frame, wherein the movement trajectory of the first frame is misaligned with the movement trajectory of the second frame, the bottom of all the positioning pins is fixedly connected to the first frame, and the bottom of all the lifting columns is horizontally rotatably connected to the second frame.

[0012] The present invention is further configured such that the power mechanism includes two support seats vertically arranged at the bottom of the top plate, a power rod horizontally rotatably arranged between the two support seats, a motor for driving the power rod to rotate is arranged at the bottom of the top plate, a first power disk and a second power disk are coaxially arranged on the power rod, a first groove, a second groove, a third groove and a fourth groove are opened on the side wall of the first power disk, and a fifth groove, a sixth groove, a seventh groove and an eighth groove are opened on the side wall of the second power disk, which are opened on the side wall;

[0013] The straight line where the axis of the power rod is located is the reference axis. The distance between each part of the first groove and the reference axis is equal. The distance between the upstream side of the second groove and the reference axis is less than the distance between the downstream side and the reference axis. The distance between each part of the third groove and the reference axis is equal. The distance between the upstream side of the fourth groove and the reference axis is greater than the distance between the downstream side and the reference axis.

[0014] The distance between the upstream side of the fifth tank and the reference axis is greater than the distance between the downstream side and the reference axis; the distances between all parts of the sixth tank and the reference axis are equal; the distance between the upstream side of the seventh tank and the reference axis is less than the distance between the downstream side and the reference axis; and the distance between the upstream side of the eighth tank and the reference axis is less than the distance between the downstream side and the reference axis.

[0015] The bottom of the first frame is vertically provided with a first arm, the bottom of the second frame is vertically provided with a second arm, the side of the first arm is horizontally provided with a first linkage part, and the side of the second arm is provided with a second linkage part.

[0016] The power rod includes a first state, a second state, a third state, and a fourth state;

[0017] When the power rod is in the first state, the first linkage part is in the first groove, the second linkage part is in the fifth groove, the top of the positioning pin is at the same height as the top of the first seat, and the first positioning pin is in a stationary state. The linkage column is located in the steering groove, and the clamping arm is located on the side of the first seat and the second seat. The clamping arm moves downward and swings toward the second seat.

[0018] When the power rod is in the second state, the first linkage part is in the second groove, the second linkage part is in the sixth groove, the positioning pin moves upward and inserts into the pre-drilled hole, the linkage column is located at the bottom of the steering groove, the clamping arm is in a stationary state, and there is a set gap between the clamping part and the top of the workpiece.

[0019] When the power rod is in the third state, the first linkage part is in the third groove, the second linkage part is in the seventh groove, the linkage column is located in the descending groove, and the pressing part descends and abuts against the top of the workpiece.

[0020] When the power rod is in the fourth state, the first linkage part is in the fourth groove, the second linkage part is in the eighth groove, the positioning pin moves downward, and the lifting column moves upward.

[0021] The present invention is further configured such that a plurality of first arms are provided at the bottom of the first frame, and a plurality of second arms are provided at the bottom of the second frame. Both ends of the first arms are provided with first linkage parts, and both ends of the second arms are provided with second linkage parts. Each first arm has a first power disk on both sides, and each second arm has a second power disk on both sides. Both the first linkage part and the second linkage part are cylindrical, and the first linkage part is rotatably connected to the first arm and the second linkage part is rotatably connected to the second arm.

[0022] The present invention is further configured such that each workpiece is positioned by two positioning units, one positioning pin used to fix the same workpiece is a first pin body, the other positioning pin is a second pin body, and a guide pin is provided at the top of the transition pin connected to the first pin body. The diameter of the guide pin increases as the height decreases, and the diameter of the bottom of the guide pin is equal to the diameter of the top of the transition pin.

[0023] The second pin includes a bottom pin and a top pin located above the bottom pin. The bottom pin is connected to the first frame. When the bottom pin is stationary, the top pin can be lowered so that the top of the transition pin is at the same height as the top of the first seat. When the bottom pin is raised, the bottom pin raises the top pin so that the top of the top pin is higher than the first seat and inserted into the pre-drilled hole.

[0024] The present invention is further configured such that a first hole, a first receiving groove, a second hole, a second receiving groove, and a third hole are sequentially formed through the first base body vertically. The diameter of the first receiving groove is larger than the diameter of the first hole and the diameter of the second hole. The diameter of the second receiving groove is larger than the diameter of the second hole and the diameter of the third hole. The outer wall of the top pin is movably fitted to the inner wall of the first hole and the inner wall of the second hole. The outer wall of the bottom pin is movably fitted to the inner wall of the third hole. A first synchronous disc is provided on the outer wall of the top pin. A first elastic element is provided between the bottom of the first synchronous disc and the bottom of the first receiving groove.

[0025] The top of the second receiving groove has two vertical grooves, each with a rectangular cross-section. A vertical part is vertically movable within each groove, with the outer wall of the vertical part fitting against the inner wall of the groove. A horizontal part is horizontally positioned at the bottom of the vertical part, and an elastic part is vertically positioned at the bottom of the inner side of the horizontal part. A clamping part is positioned at the bottom of the elastic part, and a clamping groove with a semi-circular cross-section is vertically positioned on the inner side of the clamping part. An inclined clamping slope is formed on the outer side of the clamping part. The clamping part is located on both sides of the bottom of the top pin.

[0026] The top of the bottom pin is provided with a U-shaped drive part with an upward opening. The drive part is movably located in the second receiving groove. The inner walls on both sides of the drive part are inclined drive slopes. The inclination direction of the drive slopes is the same as the inclination direction of the clamping slopes on the same side.

[0027] The clamping part includes a fifth state, a sixth state, a seventh state, and an eighth state;

[0028] When the clamping part is in the fifth state, the top of the top pin part is at the same height as the top of the first seat, the first synchronous disk is lower than the top of the first receiving groove, the side of the top pin part is separated from the clamping groove, the clamping inclined surface is in contact with the driving inclined surface, and the bottom of the clamping part is higher than the middle of the driving part.

[0029] When the clamping part is in the sixth state, the top pin part moves downward, and the top of the transition pin is at the same height as the top of the first seat body, and the side of the top pin part is separated from the clamping groove.

[0030] When the clamping part is in the seventh state, the bottom pin part rises, the driving inclined surface acts on the clamping inclined surface, and the two clamping parts move closer to each other. There is a set pressure between the side wall of the top pin part and the inner wall of the clamping groove. The bottom pin part, the driving part, and the top pin part rise synchronously, and the top of the top pin part is higher than the top of the first seat.

[0031] The invention is further configured such that: a stabilizing rod is vertically arranged at the bottom of the top pin portion; a stabilizing groove is opened at the top of the bottom pin portion for the stabilizing rod to enter; the outer wall of the stabilizing rod is movably fitted to the inner wall of the stabilizing groove; a limiting cylinder is vertically arranged at the top of the bottom pin portion; the top pin portion movably passes through the top of the limiting cylinder; a second synchronizing disc is arranged on the outer wall of the top pin portion; the second synchronizing disc is movably located inside the limiting cylinder; a second elastic element that is continuously compressed is arranged between the bottom of the second synchronizing disc and the bottom inner wall of the limiting cylinder; two mirror-shaped synchronizing portions are arranged at the top of the limiting cylinder; the opposing sides of the two synchronizing portions are synchronizing surfaces; a cuboid-shaped synchronizing block is arranged on the outer wall of the top pin portion; the synchronizing block is located below the top plate and between the two synchronizing portions; the minimum distance between the synchronizing surface and the synchronizing block decreases as the height decreases; and a hole for the synchronizing portion to enter is opened at the bottom of the top plate.

[0032] The top plate has two support plates at its bottom. Each support plate has a semi-circular support portion on both sides of its bottom. The inner side of the support plate has a J-shaped anti-fall portion. The anti-fall portion is connected to the edge of the support plate and the support portion. The synchronizing block is located between the two support plates, and the movement trajectory of the synchronizing block has a set gap with the support plate, the support portion, and the anti-fall portion.

[0033] It also includes cylindrical synchronization columns, the two ends of which are movably attached to the inner sides of the two support plates or the inner sides of the two support parts. There are two synchronization columns, which are located on both sides of the synchronization block. The synchronization columns include an eighth state, a ninth state, and a tenth state.

[0034] When the synchronizing column is in the eighth state, the bottom of the synchronizing column is located in the opening at the bottom of the anti-fall part, and the synchronizing column is separated from the synchronizing block, and the top of the second synchronizing disk abuts against the limiting cylinder.

[0035] When the synchronizing post is in the ninth state, the bottom pin rises, and the synchronizing surface drives the synchronizing post to move to abut against the side of the synchronizing block;

[0036] When the synchronizing post is in the tenth state, the bottom pin and the top pin are relatively stationary.

[0037] This invention also discloses a method for positioning using a high-efficiency welding positioning system as described in any of the preceding claims, comprising the following steps:

[0038] S1, Place the workpiece horizontally on top of the first and second seats, and insert the transition pin into the pre-drilled hole on the workpiece.

[0039] S2, the lifting column moves downward while the clamping arm swings until the clamping part is above the workpiece;

[0040] S3, the positioning pin rises and inserts into the pre-drilled hole on the workpiece, and the clamping part limits the lifting of the workpiece.

[0041] S4, the lifting column moves down again, the pressing part abuts against the top of the workpiece, and the bottom of the workpiece abuts against the first seat and the second seat;

[0042] S5, welding is performed at the contact points of different workpieces;

[0043] S6, after welding is completed, the lifting column rises and the positioning pin descends to remove the welded workpiece.

[0044] The present invention also discloses a positioning fixture for welding automobile seats, including a high-efficiency welding positioning system as described in any of the preceding claims.

[0045] Compared with existing technologies, this invention provides a high-efficiency welding positioning system. During positioning, the workpiece is first placed horizontally on top of the first and second bases, and a transition pin is inserted into a pre-drilled hole on the workpiece (built into the workpiece). The transition pin has a small diameter, so the pre-drilled hole does not need to be aligned with the positioning pin. Furthermore, the diameter of the positioning pin is usually equal to the diameter of the pre-drilled hole. Therefore, if the positioning pin is fixed in position, a certain amount of force is required to insert or separate it from the pre-drilled hole. However, the smaller diameter of the transition pin allows for easier insertion into the pre-drilled hole, reducing operational difficulty. Secondly, complete alignment between the pre-drilled hole and the positioning pin is not required, further improving operational convenience.

[0046] Then the lifting column moves downward while the clamping arm swings until the clamping part is above the workpiece; at this time, there is a certain height difference (small) between the clamping part and the top of the workpiece, so that the clamping part can not affect the horizontal movement of the workpiece.

[0047] The locating pin then rises, inserting itself into the pre-drilled hole on the workpiece. The clamping part limits the movement of the lifted workpiece. If there is a small misalignment between the locating pin and the pre-drilled hole (as is the case in most cases), the side wall of the transition pin will inevitably act on the inner wall of the hole during the rising process, driving the workpiece upward and horizontally. Since the clamping part is located above the workpiece at this time, it prevents the workpiece from rising too much. At the same time, the clamping part does not hinder the horizontal movement of the workpiece. Therefore, after the transition pin side wall drives the workpiece to move during the rising process, the locating pin is properly inserted into the pre-drilled hole.

[0048] The lifting column then descends again, with the clamping part contacting the top of the workpiece and the bottom of the workpiece contacting the first and second seats. At this point, horizontally, the outer wall of the locating pin fits against the inner wall of the pre-drilled hole, while vertically, the clamping part, the first seat, and the second seat fix the position of the workpiece. Each workpiece has at least two locating units for positioning, thus ensuring precise positional stability. Welding is then performed at the contact points of different workpieces. Depending on the situation, this can be done by a worker using a handheld welding torch or by a robotic arm moving the welding head for automated welding. After welding, the lifting column rises, the locating pin descends, and the welded workpiece is removed. This workpiece is typically a large piece composed of multiple workpieces. Since the locating pin descends to the same height as the top of the first seat, the transition pin is now located within the pre-drilled hole. Because the diameter of the transition pin is smaller than the diameter of the pre-drilled hole, the workpiece can be easily and effortlessly removed from the locating unit. Attached Figure Description

[0049] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention. Figure 1 ;

[0050] Figure 2 yes Figure 1 Enlarged view of section A;

[0051] Figure 3 This is a structural schematic diagram of Embodiment 1 of the present invention. Figure 2 ;

[0052] Figure 4 yes Figure 3 Enlarged view of section B;

[0053] Figure 5 This is a schematic diagram of the portion below the top plate in Embodiment 1 of the present invention;

[0054] Figure 6 yes Figure 5 Enlarged view of section C;

[0055] Figure 7 yes Figure 5 Enlarged view of section D;

[0056] Figure 8 This is a cross-sectional view of Embodiment 1 of the present invention. Figure 1 ;

[0057] Figure 9 yes Figure 8 Enlarged view of section E in the middle;

[0058] Figure 10 yes Figure 8 Enlarged view of section F in the middle;

[0059] Figure 11 This is a cross-sectional view of Embodiment 1 of the present invention. Figure 2 ;

[0060] Figure 12 yes Figure 11 Enlarged view of section G in the middle;

[0061] Figure 13 yes Figure 11 Enlarged view of section H in the middle;

[0062] Figure 14 These are cross-sectional views of the first and second power disks in various states in Embodiment 1 of the present invention;

[0063] Figure 15 This is an internal schematic diagram of the first seat in Embodiment 1 of the present invention;

[0064] Figure 16This is a schematic diagram of the second pin portion in Embodiment 1 of the present invention;

[0065] Figure 17 This is a schematic diagram of the clamping part in Embodiment 1 of the present invention;

[0066] Figure 18 This is an internal schematic diagram of the clamping seat in Embodiment 1 of the present invention;

[0067] Figure 19 This is a schematic diagram of the lifting column part in Embodiment 1 of the present invention;

[0068] Figure 20 This is a schematic diagram of the second pin portion in Embodiment 2 of the present invention;

[0069] Figure 21 This is a cross-sectional view of the second pin portion in Embodiment 2 of the present invention;

[0070] Figure 22 This is a schematic diagram of the top pin portion in Embodiment 2 of the present invention;

[0071] Figure 23 This is a schematic diagram of the support plate and top plate in Embodiment 2 of the present invention;

[0072] Figure 24 This is a schematic diagram of the support plate and support portion in Embodiment 2 of the present invention.

[0073] The components include: 1. Base; 1a. Bottom plate; 1b. Top plate; 1c. Support column; 2. First seat body; 3. Second seat body; 4. Pressing seat body; 5. Receiving cavity; 6. Turning groove; 7. Lowering groove; 8. Transition pin; 9. Lifting column; 10. Linkage column; 11. Pressing arm; 12. Pressing part; 13. First frame; 14. Second frame; 15. Support seat; 16. Power rod; 17. Motor; 18. First power plate; 19. Second power plate; 20. First groove; 21. Second groove; 22. Third groove; 23. Fourth groove; 24. Fifth groove; 25. Sixth groove; 26. Seventh groove; 27. Eighth groove; 28. First arm body; 29. ​​Second arm body; 30. First pin body. 31. Second pin; 31a. Bottom pin; 31b. Top pin; 32. Guide pin; 33. First hole; 34. First receiving groove; 35. Second hole; 36. Second receiving groove; 37. Third hole; 38. First synchronizer disc; 39. First elastic element; 40. Vertical groove; 41. Vertical part; 42. Horizontal part; 43. Elastic part; 44. Clamping part; 45. Clamping groove; 46. Clamping inclined surface; 47. Drive part; 48. Drive inclined surface; 49. Stabilizer bar; 50. Stabilizer groove; 51. Limiting cylinder; 52. Second synchronizer disc; 53. Second elastic element; 54. Synchronizing part; 55. Synchronizing surface; 56. Synchronizing block; 57. Support plate; 58. Support part; 59. Anti-fall part; 60. Synchronizing column. Detailed Implementation

[0074] Example 1

[0075] A high-efficiency welding positioning system, such as Figures 1 to 19 As shown, the device includes a base 1 and several positioning units disposed on the base 1. At least two of the positioning units are used to fix a workpiece (wherein the workpiece and the pre-drilled hole are not the objects claimed in this application, and are only mentioned here for illustrative purposes; furthermore, the specific shape of the workpiece is not limited in detail, and the attached drawing is for illustrative purposes only). The positioning unit includes:

[0076] The first seat 2, the second seat 3, and the pressing seat 4 are provided. The pressing seat 4 has a vertically formed receiving cavity 5 inside. The inner wall of the receiving cavity 5 has a spiral turning groove 6 and a vertical descending groove 7. The top of the descending groove 7 is connected to the bottom of the turning groove 6.

[0077] A positioning pin is provided at the top of the positioning pin, the diameter of which increases as the height decreases, and the diameter of the bottom of the transition pin is equal to the diameter of the positioning pin.

[0078] A lifting column 9 is vertically movable through the pressing seat 4, and the outer wall of the lifting column 9 is attached to the pressing seat 4. A linkage column 10 is provided on the side wall of the lifting column 9. The free end of the linkage column 10 is located in the turning groove 6 or the descending groove 7. A pressing arm 11 is horizontally provided on the top of the lifting column 9. A pressing part 12 is provided at the bottom of the free end of the pressing arm 11.

[0079] The power mechanism is used to drive all the positioning pins and all the lifting columns 9 to move up and down. In the standby state, the clamping arm 11 is located on the side of the first seat 2 and the second seat 3, and the top of the positioning pin is at the same height as the top of the first seat 2. In the working state, the clamping part 12 is located between the first seat 2 and the second seat 3, and the positioning pin is inserted into the pre-drilled hole on the workpiece.

[0080] The base 1 includes a bottom plate 1a and a top plate 1b located above the bottom plate 1a. Several support columns 1c connected to the bottom plate 1a are vertically arranged at the bottom of the top plate 1b. The positioning pin and the lifting column 9 both move through the top plate 1b. The power mechanism is located between the bottom plate 1a and the top plate 1b. The first seat body 2, the second seat body 3 and the pressing seat body 4 are all located on the top plate 1b.

[0081] It also includes a first frame 13 and a second frame 14. The movement trajectory of the first frame 13 is misaligned with that of the second frame 14. The bottom of all the positioning pins is fixedly connected to the first frame 13, and the bottom of all the lifting columns 9 is horizontally rotatably connected to the second frame 14.

[0082] The power mechanism includes two support seats 15 vertically arranged at the bottom of the top plate 1b, and a power rod 16 is horizontally rotatably arranged between the two support seats 15. A motor 17 for driving the power rod 16 to rotate is arranged at the bottom of the top plate 1b. A first power disk 18 and a second power disk 19 are coaxially arranged on the power rod 16. The side wall of the first power disk 18 has a first groove 20, a second groove 21, a third groove 22 and a fourth groove 23 that are connected end to end. The side wall of the second power disk 19 has a fifth groove 24, a sixth groove 25, a seventh groove 26 and an eighth groove 27 that are connected end to end.

[0083] The straight line where the axis of the power rod 16 is located is the reference axis. The distance between each part of the first groove 20 and the reference axis is equal. The distance between the upstream side of the second groove 21 and the reference axis is less than the distance between the downstream side and the reference axis. The distance between each part of the third groove 22 and the reference axis is equal. The distance between the upstream side of the fourth groove 23 and the reference axis is greater than the distance between the downstream side and the reference axis.

[0084] The distance between the upstream side of the fifth tank 24 and the reference axis is greater than the distance between the downstream side and the reference axis; the distances between all parts of the sixth tank 25 and the reference axis are equal; the distance between the upstream side of the seventh tank 26 and the reference axis is less than the distance between the downstream side and the reference axis; and the distance between the upstream side of the eighth tank 27 and the reference axis is less than the distance between the downstream side and the reference axis.

[0085] The bottom of the first frame 13 is vertically provided with a first arm 28, the bottom of the second frame 14 is vertically provided with a second arm 29, the side of the first arm 28 is horizontally provided with a first linkage part, and the side of the second arm 29 is provided with a second linkage part.

[0086] The power rod 16 includes a first state, a second state, a third state, and a fourth state;

[0087] When the power rod 16 is in the first state, the first linkage part is in the first groove 20, the second linkage part is in the fifth groove 24, the top of the positioning pin is at the same height as the top of the first seat 2, and the first positioning pin is in a stationary state. The linkage column 10 is located in the steering groove 6, and the clamping arm 11 is located on the side of the first seat 2 and the second seat 3. The clamping arm 11 moves downward and swings toward the second seat 3.

[0088] When the power rod 16 is in the second state, the first linkage part is in the second groove 21, the second linkage part is in the sixth groove 25, the positioning pin moves upward and inserts into the pre-drilled hole, the linkage column 10 is located at the bottom of the steering groove 6, the clamping arm 11 is in a stationary state, and there is a set gap between the clamping part 12 and the top of the workpiece (wherein the "set gap" in this application only means that the two structures are in a state of non-contact and very small distance, and the specific gap size can be selected according to the actual situation, such as preferably 0.2-0.5mm, or other optional gaps, which are not limited in detail here).

[0089] When the power rod 16 is in the third state, the first linkage part is in the third groove 22, the second linkage part is in the seventh groove 26, the linkage column 10 is located in the descending groove 7, and the pressing part 12 descends and abuts against the top of the workpiece.

[0090] When the power rod 16 is in the fourth state, the first linkage part is in the fourth groove 23, the second linkage part is in the eighth groove 27, the positioning pin moves downward, and the lifting column 9 moves upward.

[0091] The bottom of the first frame is provided with a plurality of first arms 28, and the bottom of the second frame is provided with a plurality of second arms 29. Both ends of the first arms 28 are provided with first linkage parts, and both ends of the second arms 29 are provided with second linkage parts. Each first arm 28 has a first power disk 18 on both sides, and each second arm 29 has a second power disk 19 on both sides. Both the first linkage parts and the second linkage parts are cylindrical, and the first linkage parts are rotatably connected to the first arms 28, and the second linkage parts are rotatably connected to the second arms 29.

[0092] Each workpiece is positioned by two positioning units. One positioning pin used to fix the same workpiece is a first pin 30, and the other positioning pin is a second pin 31. The top of the transition pin 8 connected to the first pin 30 is provided with a guide pin 32. The diameter of the guide pin 32 increases as the height decreases, and the diameter of the bottom of the guide pin 32 is equal to the diameter of the top of the transition pin 8.

[0093] The second pin 31 includes a bottom pin 31a and a top pin 31b located above the bottom pin 31a. The bottom pin 31a is connected to the first frame 13. When the bottom pin 31a is in a stationary state, the top pin 31b can be lowered so that the top of the transition pin 8 is at the same height as the top of the first seat 2. When the bottom pin 31a is raised, the bottom pin 31a raises the top pin 31b so that the top of the top pin 31b is higher than the first seat 2 and inserted into the pre-drilled hole.

[0094] A first hole 33, a first receiving groove 34, a second hole 35, a second receiving groove 36, and a third hole 37 are sequentially formed through the first base body 2. The diameter of the first receiving groove 34 is larger than the diameters of the first hole 33 and the second hole 35. The diameter of the second receiving groove 36 is larger than the diameters of the second hole 35 and the third hole 37. The outer wall of the top pin 31b is movably fitted to the inner wall of the first hole 33 and the inner wall of the second hole 35. The outer wall of the bottom pin 31a is movably fitted to the inner wall of the third hole 37. A first synchronous disc 38 is provided on the outer wall of the top pin 31b. A first elastic member 39 is provided between the bottom of the first synchronous disc 38 and the bottom of the first receiving groove 34.

[0095] The top of the second receiving groove 36 has two vertical grooves 40, each with a rectangular cross-section. A vertical part 41 is vertically movably disposed within each groove 40. The outer wall of the vertical part 41 is attached to the inner wall of the groove 40. A horizontal part 42 is horizontally disposed at the bottom of the vertical part 41 (support openings are also provided on both sides of the second receiving groove 36. When the bottom of the horizontal part 42 abuts against the bottom of the support opening, the horizontal part 42 is higher than the driving part 47, and the two clamping parts 44 are either separated from or attached to the driving part 47, while the elastic part 43 is in an undeformed state). An elastic part 43 is vertically disposed at the bottom of the inner side of the horizontal part 42. A clamping part 44 is disposed at the bottom of the elastic part 43. A clamping groove 45 with a semi-circular cross-section is vertically disposed on the inner side of the clamping part 44, and an inclined clamping slope 46 is disposed on the outer side. The clamping part 44 is disposed on both sides of the bottom of the top pin part 31b.

[0096] The top of the bottom pin 31a is provided with a U-shaped drive part 47 with an upward opening. The drive part 47 is movably located in the second receiving groove 36. The inner walls on both sides of the drive part 47 are inclined drive slopes 48. The inclination direction of the drive slopes 48 is the same as the inclination direction of the clamping slopes 46 on the same side.

[0097] The clamping part 44 includes a fifth state, a sixth state, a seventh state, and an eighth state;

[0098] When the clamping part 44 is in the fifth state, the top of the top pin 31b is at the same height as the top of the first base 2, the first synchronous disk 38 is lower than the top of the first receiving groove 34, the side of the top pin 31b is separated from the clamping groove 45, the clamping inclined surface 46 is in contact with the driving inclined surface 48, and the bottom of the clamping part 44 is higher than the middle of the driving part 47.

[0099] When the clamping part 44 is in the sixth state, the top pin part 31b moves downward, and the top of the transition pin 8 is at the same height as the top of the first seat 2. The side of the top pin part 31b is separated from the clamping groove 45.

[0100] When the clamping part 44 is in the seventh state, the bottom pin part 31a rises, the driving inclined surface 48 acts on the clamping inclined surface 46, and the two clamping parts 44 move closer to each other. There is a set pressure between the side wall of the top pin part 31b and the inner wall of the clamping groove 45 (where the pressure is sufficient to drive the top pin part 31b to rise, and at this time the shape formed by the two clamping grooves 45 is close to an inverted frustum shape with a larger top and a smaller bottom, which can prevent the top pin part 31b from moving downward relative to the clamping part 44). The bottom pin part 31a, the driving part 47, and the top pin part 31b rise synchronously, and the top of the top pin part 31b is higher than the top of the first base 2. Preferably, there is a magnetic attraction between the horizontal part 42 and the bottom of the second receiving groove 36 (for example, a magnetic block is pre-embedded at the bottom of the second receiving groove 36). In this way, when the bottom pin part 31a is stationary, the top pin part 31b can rise and fall normally. However, when the bottom pin part 31a rises, the horizontal part 42 will not rise immediately because there is a magnetic attraction between the horizontal part 42 and the bottom of the second receiving groove 36. Instead, it needs to have a certain force between the driving inclined surface 48 and the clamping inclined surface 46 before it can rise. At the same time, the elastic part 43 undergoes elastic deformation during this process, causing the two clamping parts 44 to move closer to each other.

[0101] This invention also discloses a method for positioning using a high-efficiency welding positioning system as described in any of the preceding claims, comprising the following steps:

[0102] S1, place the workpiece horizontally on top of the first base 2 and the second base 3, and insert the transition pin 8 into the pre-drilled hole on the workpiece.

[0103] S2, the lifting column 9 moves downward, while the clamping arm 11 swings until the clamping part 12 is above the workpiece;

[0104] S3, the positioning pin rises and inserts into the pre-drilled hole on the workpiece, and the clamping part 12 limits the lifting of the workpiece.

[0105] S4, the lifting column 9 descends again, the pressing part 12 abuts against the top of the workpiece, and the bottom of the workpiece abuts against the first seat 2 and the second seat 3;

[0106] S5, welding is performed at the contact points of different workpieces;

[0107] S6, after welding is completed, the lifting column 9 rises and the positioning pin descends to remove the welded workpiece.

[0108] This invention also discloses a positioning fixture for welding automotive seats, including a high-efficiency welding positioning system as described in any of the preceding claims. In this embodiment, it is preferred that the various units of the automotive seat are positioned before welding during the welding process, such as the seat frame and seat accessories being positioned separately before welding. However, it should be understood that this can also be applied to any other scenario requiring positioning before welding, and is not limited to automotive seats.

[0109] This invention provides a high-efficiency welding positioning system, method, and positioning fixture for automotive seat welding. During positioning, the workpiece is first horizontally placed on top of the first seat 2 and the second seat 3, and a transition pin 8 is inserted into a pre-drilled hole (integrated into the workpiece). The transition pin 8 has a small diameter, so the pre-drilled hole does not need to be aligned with the positioning pin. Normally, the diameter of the positioning pin is equal to the diameter of the pre-drilled hole. Therefore, if the positioning pin is fixed in position, a certain amount of force is required to insert or separate it from the pre-drilled hole. However, the smaller diameter of the transition pin 8 allows for easier insertion into the pre-drilled hole, reducing operational difficulty. Furthermore, complete alignment between the pre-drilled hole and the positioning pin is not required, further improving operational convenience.

[0110] Then the lifting column 9 moves downward, while the clamping arm 11 swings until the clamping part 12 is above the workpiece; at this time, there is a certain height difference (small) between the clamping part 12 and the top of the workpiece, so that the clamping part 12 can not affect the horizontal movement of the workpiece.

[0111] The locating pin then rises, inserting itself into the pre-drilled hole on the workpiece. The clamping part 12 limits the movement of the lifted workpiece. If there is a small misalignment between the locating pin and the pre-drilled hole (as is the case in most cases), the side wall of the transition pin 8 will inevitably act on the inner wall of the hole during the rising process, driving the workpiece upward and horizontally. Since the clamping part 12 is located above the workpiece at this time, it prevents the workpiece from rising too much. At the same time, the clamping part 12 does not hinder the horizontal movement of the workpiece. Therefore, after the side wall of the transition pin 8 drives the workpiece to move during the rising process, the locating pin is properly inserted into the pre-drilled hole.

[0112] The lifting column 9 then descends again, with the clamping part 12 contacting the top of the workpiece and the bottom of the workpiece contacting the first seat 2 and the second seat 3. At this point, horizontally, the outer wall of the positioning pin fits against the inner wall of the pre-drilled hole, while vertically, the clamping part 12, the first seat 2, and the second seat 3 fix the position of the workpiece. Each workpiece has at least two positioning units, ensuring precise positional stability. Welding is then performed at the contact points of different workpieces. Depending on the situation, this can be done by a worker using a handheld welding torch or by a robotic arm moving the welding head for automatic welding. After welding, the lifting column 9 rises, the positioning pin descends, and the welded workpiece is removed. This workpiece is a large piece composed of multiple workpieces. Simultaneously, since the positioning pin descends to the same height as the top of the first seat 2, the transition pin 8 is located within the pre-drilled hole. Because the diameter of the transition pin 8 is smaller than the diameter of the pre-drilled hole, the workpiece can be easily and effortlessly removed from the positioning unit.

[0113] Since the height of the guide pin 32 is higher than that of the transition pin 8, and each workpiece unit is only horizontally limited by two positioning pins, when placing the workpiece, you only need to first attach one pre-drilled hole to the guide pin 32, and then lower the height of the workpiece so that the other pre-drilled hole is attached to the transition pin 8. That is, there is no need to align the two pre-drilled holes with the two transition pins 8 at the same time, which further improves the ease of operation. Furthermore, when placing the workpiece, the positions of the first pin 30 and the guide pin 32 are fixed, but the top pin 31b in the second pin 31 can be raised and lowered. Thus, when a pre-drilled hole is fitted onto the guide pin 32 and transitions from the guide pin 32 to the corresponding transition pin 8, even if the other pre-drilled hole is not aligned with the corresponding transition pin 8, for example, if the bottom of the workpiece touches the top of the transition pin 8, the workpiece can press down the top pin 31b so that the bottom of the workpiece can touch the top of the first seat 2. Then, the worker only needs to swing or move the workpiece within a small range, and after the transition pin 8 on the top pin 31b is aligned with the pre-drilled hole, the top pin 31b will automatically spring up, thereby allowing the transition pin 8 to enter the pre-drilled hole.

[0114] The entire operation process is as follows: After the worker attaches a pre-drilled hole to the higher guide pin 32, the workpiece is lowered and lowered to the transition pin 8 at the bottom of the guide pin 32. If the other pre-drilled hole is aligned with the transition pin 8 on the top pin 31b, the position of the workpiece does not need to be adjusted. However, if the other pre-drilled hole is not properly aligned with the transition pin 8 on the top pin 31b, and the bottom of the workpiece touches the top of the transition pin 8, the workpiece can be pressed down on the transition pin 8 so that the bottom of the workpiece touches the top of the first seat 2. However, usually there is not a large positional deviation between the pre-drilled hole and the transition pin 8 on the top pin 31b. Therefore, the worker only needs to swing or move the angle of the workpiece slightly to make the pre-drilled hole aligned with the transition pin 8 on the top pin 31b. At this time, the top pin 31b is raised and the transition pin 8 is inserted into the pre-drilled hole. The tops of the first seat 2 and the second seat 3 can both be horizontal, facilitating the movement of the workpiece (either swinging or translating); or the top of the first seat 2 can be horizontal, while the tops of the second seat 3 have protrusions on both sides to limit the workpiece. In this case, if the pre-drilled hole is not aligned with the transition pin 8 at the top of the top pin 31b when placing the workpiece, the workpiece can be translated by a small distance so that the pre-drilled hole fits into the transition pin 8 at the top of the top pin 31b.

[0115] When the bottom of the workpiece abuts against the top of the transition pin 8, the top pin 31b can be directly compressed because its sidewall is separated from the clamping groove 45, and the first elastic element 39 is also compressed. Then, when the pre-drilled hole moves to face the transition pin 8, the first elastic element 39 rises under the action of elastic force, causing the transition pin 8 to insert into the pre-drilled hole. At this point, the positioning pin and the corresponding pre-drilled hole are usually not coaxial, meaning the workpiece will subsequently be driven by the sidewall of the transition pin 8.

[0116] Then, motor 17 drives power rod 16 to rotate, and power rod 16 drives first power plate 18 and second power plate 19 to rotate. At this time, since the distance between the first groove 20 and the reference axis is equal, the positioning pin and bottom pin 31a remain stationary. However, since the distance between the upstream side of the fifth groove 24 and the reference axis is greater than the distance between the downstream side and the reference axis, the second linkage moves downward, which also drives the second frame 14 and all the lifting columns 9 to move downward. During this movement, the linkage column 10 is driven by the inner wall of the steering groove 6, causing the lifting column 9 to swing towards the first seat 2 and the second seat 3 while descending. When placing the workpiece, the clamping arm 11 and the like are located on the side of the first seat 2 and the second seat 3, so as not to affect the placement of the workpiece.

[0117] When the power rod 16 rotates 90 degrees, the clamping part 12 is slightly higher than the top of the workpiece, and the positioning pin and bottom pin 31a are stationary. The power rod 16 then continues to rotate. Since the distances between all parts of the sixth groove 25 and the reference axis are equal, the lifting column 9, clamping arm 11, and clamping part 12 remain stationary. Simultaneously, because the distance between the upstream side of the second groove 21 and the reference axis is less than the distance between the downstream side and the reference axis, the first pin 30 and the bottom pin 31a rise. During the rising of the first pin 30, the sidewall of the transition pin 8 acts on the inner wall of the pre-drilled hole, directly driving the workpiece to make minute positional movements, and ensuring that the first pin 30 is coaxial with the corresponding pre-drilled hole. As the bottom pin 31a rises, the driving inclined surface 48 acts on the clamping inclined surface 46, causing the elastic part 43 to undergo elastic deformation. At the same time, the distance between the two clamping parts 44 decreases and they abut against the two sides of the bottom of the top pin 31b. At this time, the top pin 31b and the bottom pin 31a are fixed in relative position through the two clamping parts 44. That is, the top pin 31b rises at the same time as the bottom pin 31a rises. Therefore, when the bottom pin 31a rises to its highest height, the top pin 31b is also inserted into the corresponding pre-drilled hole.

[0118] Afterwards, the power rod 16 continues to rotate. Since the distance between each part of the third groove 22 and the reference axis is equal, and the distance between the upstream side of the seventh groove 26 and the reference axis is less than the distance between the downstream side and the reference axis, the positions of the first pin 30 and the top pin 31b are fixed. However, the second linkage, the second arm 29, and the lifting column 9 continue to descend. At this time, since the descending groove 7 is in a vertical state, the clamping arm 11 only descends vertically until the power rod 16 rotates exactly 90 degrees. Then, the clamping part 12 clamps the workpiece, and the bottom of the workpiece abuts against the top of the first seat 2 and the second seat 3. At this time, the positioning of one workpiece is completed. After all the different workpieces are positioned, the parts of the workpieces that need to be welded are in abutting state, and welding can be performed.

[0119] After welding is completed, the power rod 16 rotates 90 degrees. During this process, the first linkage moves to the upstream end of the first groove 20, the second linkage moves to the upstream end of the fifth groove 24, the linkage column 10 moves to the top of the steering groove 6, and the first pin 30 and the bottom pin 31a both descend to their lowest height. At this time, not only are the diameters of the transition pin 8 and the guide pin 32 smaller than the pre-drilled hole, but the clamping arm 11 is also located on the side of the workpiece, making it easy to remove the workpiece. When the bottom pin 31a rises to its highest height, the first elastic element 39 is in an extended state. After the bottom pin 31a descends, under the pulling force of the first elastic element 39 and the action of the top of the first receiving groove 34, the top pin 31b moves downward and separates from the pre-drilled hole, facilitating the separation of the workpiece from the top pin 31b. Simultaneously, the horizontal part 42 moves downward under the influence of gravity and magnetic attraction, causing the clamping part 44 to separate from the top pin part 31b until the bottom of the horizontal part 42 touches the stepped opening on the side of the second receiving groove 36 (i.e., the bottom of the support opening), at which point the horizontal part 42 is higher than the driving part 47. In actual use, an elastic body (such as a spring, not shown in the figure) can be installed between the top of the vertical part 41 and the top of the vertical groove 40, and the spring body is continuously in a compressed state. Thus, under the action of the spring body, the horizontal part 42 is always at its lowest height in the standby state; at the same time, when the workpiece is removed, the elastic body can also drive the horizontal part 42 to move downward, so that the clamping part 44 can return to the separated state from the top pin part 31b. The elastic body does not affect the upward movement of the horizontal part 42, that is, the bottom pin part 31a can normally drive the top pin part 31b to move upward.

[0120] The first linkage and the second linkage are located on both sides of the first arm body 28 and the second arm body 29. Therefore, they not only improve the position and movement stability of the first arm body 28 and the second arm body 29, but also prevent deformation of the first arm body 28 and the second arm body 29, thus ensuring service life and operational stability.

[0121] In this application, all positioning pins (i.e., the first pin 30 and the second pin 31) and all lifting columns 9 are powered by the same motor 17. This not only reduces the production and operating costs of the equipment but also ensures the precision of the cooperation between the positioning pins and the lifting columns 9. Furthermore, the first power plate 18 and the second power plate 19 enable multi-stage movements of the lifting columns 9 and positioning pins, with their movements complementing each other to ensure ease of workpiece placement and removal, as well as positional accuracy during welding. Simultaneously, the design of the guide pin 32, transition pin 8, top pin 31b, and bottom pin 31a further enhances the ease of workpiece placement; simply attach the pre-drilled hole to the higher guide pin 32 and fine-tune the workpiece's (which is opaque) position.

[0122] Example 2

[0123] The difference from Example 1 is that, as Figures 20 to 24 As shown, a stabilizing rod 49 is vertically arranged at the bottom of the top pin portion 31b, and a stabilizing groove 50 is formed at the top of the bottom pin portion 31a for the stabilizing rod 49 to enter. The outer wall of the stabilizing rod 49 is movably fitted against the inner wall of the stabilizing groove 50. A limiting cylinder 51 is vertically arranged at the top of the bottom pin portion 31a, and the top pin portion 31b moves through the top of the limiting cylinder 51. A second synchronizing disc 52 is arranged on the outer wall of the top pin portion 31b. The second synchronizing disc 52 is movably located inside the limiting cylinder 51, and the bottom of the second synchronizing disc 52 is flush with the bottom of the limiting cylinder 51. A second elastic element 53 that is continuously compressed is provided between the walls. The top of the limiting cylinder 51 is provided with two mirror-shaped synchronization parts 54. The opposing sides of the two synchronization parts 54 are synchronization surfaces 55. A cuboid synchronization block 56 is provided on the outer wall of the top pin part 31b. The synchronization block 56 is located below the top plate 1b and between the two synchronization parts 54. The minimum distance between the synchronization surface 55 and the synchronization block 56 decreases as the height decreases. The bottom of the top plate 1b is provided with a hole for the synchronization part 54 to enter.

[0124] The bottom of the top plate 1b is provided with two support plates 57. Semi-circular support portions 58 are provided on both sides of the bottom of the support plate 57. J-shaped anti-fall portions 59 are provided on the inner side of the support plate 57. The anti-fall portions 59 are connected to the edges of the support plate 57 and the support portions 58. The synchronization block 56 is located between the two support plates 57, and the movement trajectory of the synchronization block 56 has a set gap with the support plate 57, the support portions 58 and the anti-fall portions 59.

[0125] It also includes a cylindrical synchronization post 60, the two ends of which are movably attached to the inner sides of the two support plates 57 or the two support parts 58. There are two synchronization posts 60, which are located on both sides of the synchronization block 56. The synchronization post 60 includes an eighth state, a ninth state and a tenth state.

[0126] When the synchronization column 60 is in the eighth state, the bottom of the synchronization column 60 is located in the opening at the bottom of the anti-fall part 59, and the synchronization column 60 is separated from the synchronization block 56, and the top of the second synchronization disk 52 abuts against the limiting cylinder 51.

[0127] When the synchronization post 60 is in the ninth state, the bottom pin 31a rises, and the synchronization surface 55 drives the synchronization post 60 to move to the side of the synchronization block 56.

[0128] When the synchronization post 60 is in the tenth state, the bottom pin 31a and the top pin 31b are relatively stationary.

[0129] When the bottom pin 31a is not raised, the top pin 31b, the synchronizing block 56, the synchronizing post 60, the support plate 57, and the anti-falling part 59 are not in contact. Therefore, when the transition pin 8 at the top of the top pin 31b is subjected to downward pressure, the second elastic element 53 can be compressed, causing the transition pin 8 to move downward to the same height as the top of the first seat 2. When the pre-drilled hole is aligned with the transition pin 8, the second elastic element 53 drives the second synchronizing disc 52 and the top pin 31b to rise. When the bottom pin 31a rises, the second elastic element 53 first drives the top pin 31b to rise, but the elastic force of the second elastic element 53 is small. Therefore, the synchronizing part 54 moves upward relative to the synchronizing block 56. During the upward movement of the synchronizing block 56, the synchronizing surface 55 first acts obliquely upward on the synchronizing post 60, driving the synchronizing post 60 out from the bottom of the anti-falling part 59, so that the synchronizing post 60 abuts against the side of the synchronizing block 56. Since the distance between the synchronizing surface 55 and the sidewall of the synchronizing block 56 decreases with decreasing height, while the diameter of the synchronizing column 60 remains fixed, and the synchronizing column 60 is preferably made of a material with a high coefficient of static friction (e.g., a rubber layer on the surface), the synchronizing column 60 cannot rotate. This also prevents relative movement between the synchronizing block 56 and the synchronizing part 54. In other words, the top pin 31b and the bottom pin 31a remain relatively stationary, and the bottom pin 31a can raise the top pin 31b. The starting time of the top pin 31b's rise is slightly later than that of the bottom pin 31a, and the rising stroke of the top pin 31b is also slightly less than that of the bottom pin 31a. However, they rise synchronously with the same magnitude, meaning the two differences are almost imperceptible to the naked eye. The anti-fall part 59 and the synchronizing part 54 are in a state of mutual independence.

[0130] When the workpiece is removed, the bottom pin 31a descends. At this time, even if the pre-drilled hole has friction on the top of the top pin 31b, when the top of the limiting cylinder 51 touches the second synchronous disc 52, the top pin 31b can be driven to separate from the workpiece. At this time, the synchronous column 60 moves into the opening at the bottom of the anti-fall part 59 under the action of gravity and is separated from the synchronous block 56.

[0131] It should also be noted that all terms such as "set up" and similar descriptive words in this application (especially the specification) indicate that two structures have or exist a connection relationship. However, the specific means by which the two are connected are not limited in detail, and are usually conventional connection methods. That is, the means should be understood as prior art and do not need to be elaborated. For example, "m is set up with n" only indicates that structure m has structure n, and whether the two are connected by welding, riveting, adhesive, or integral molding is within the scope of protection of this application. Similarly, "x is rotatably set up with y" only indicates that y and x can rotate relative to each other, and whether the two are connected by a bearing, or whether y directly passes through x and is rotatably connected to x, or other feasible methods, are all within the scope of protection of this application.

Claims

1. A high-efficiency welding positioning system, characterized in that, The system includes a base (1) and a plurality of positioning units disposed on the base (1), wherein at least two of the positioning units are used to fix a workpiece, and the positioning units include: The first seat (2), the second seat (3), and the pressing seat (4) are provided with a vertically opening receiving cavity (5) inside the pressing seat (4). The inner wall of the receiving cavity (5) is provided with a spiral turning groove (6) and a vertical descending groove (7). The top of the descending groove (7) is connected to the bottom of the turning groove (6). A positioning pin is provided at the top of the positioning pin, the diameter of which increases as the height decreases, and the diameter of the bottom of the transition pin is equal to the diameter of the positioning pin. A lifting column (9) is vertically movable through the pressing seat (4), and the outer wall of the lifting column (9) is attached to the pressing seat (4). A linkage column (10) is provided on the side wall of the lifting column (9). The free end of the linkage column (10) is located in the turning groove (6) or the descending groove (7). A pressing arm (11) is horizontally provided on the top of the lifting column (9). A pressing part (12) is provided at the bottom of the free end of the pressing arm (11). The power mechanism is used to drive all the positioning pins and all the lifting columns (9) to lift. In the standby state, the clamping arm (11) is located on the side of the first seat (2) and the second seat (3), and the top of the positioning pin is at the same height as the top of the first seat (2). In the working state, the clamping part (12) is located between the first seat (2) and the second seat (3), and the positioning pin is inserted into the pre-drilled hole on the workpiece.

2. The high-efficiency welding positioning system according to claim 1, characterized in that, The base (1) includes a bottom plate (1a) and a top plate (1b) located above the bottom plate (1a). Several support columns (1c) connected to the bottom plate (1a) are vertically arranged at the bottom of the top plate (1b). The positioning pin and the lifting column (9) both move through the top plate (1b). The power mechanism is located between the bottom plate (1a) and the top plate (1b). The first seat body (2), the second seat body (3) and the pressing seat body (4) are all located on the top plate (1b).

3. The high-efficiency welding positioning system according to claim 2, characterized in that, It also includes a first frame (13) and a second frame (14). The movement trajectory of the first frame (13) is misaligned with that of the second frame (14). The bottom of all the positioning pins is fixedly connected to the first frame (13), and the bottom of all the lifting columns (9) is horizontally rotatably connected to the second frame (14).

4. The high-efficiency welding positioning system according to claim 3, characterized in that, The power mechanism includes two support seats (15) vertically arranged at the bottom of the top plate (1b), and a power rod (16) is horizontally rotatably arranged between the two support seats (15). A motor (17) for driving the power rod (16) to rotate is arranged at the bottom of the top plate (1b). A first power disk (18) and a second power disk (19) are coaxially arranged on the power rod (16). The first power disk (18) has a first groove (20), a second groove (21), a third groove (22) and a fourth groove (23) that are connected end to end on its side wall. The second power disk (19) has a fifth groove (24), a sixth groove (25), a seventh groove (26) and an eighth groove (27) that are connected end to end on its side wall. The straight line where the axis of the power rod (16) is located is the reference axis. The distance between each part of the first groove (20) and the reference axis is equal. The distance between the upstream side of the second groove (21) and the reference axis is less than the distance between the downstream side and the reference axis. The distance between each part of the third groove (22) and the reference axis is equal. The distance between the upstream side of the fourth groove (23) and the reference axis is greater than the distance between the downstream side and the reference axis. The distance between the upstream side of the fifth tank (24) and the reference axis is greater than the distance between the downstream side and the reference axis. The distances between all parts of the sixth tank (25) and the reference axis are equal. The distance between the upstream side of the seventh tank (26) and the reference axis is less than the distance between the downstream side and the reference axis. The distance between the upstream side of the eighth tank (27) and the reference axis is less than the distance between the downstream side and the reference axis. The bottom of the first frame (13) is vertically provided with a first arm (28), the bottom of the second frame (14) is vertically provided with a second arm (29), the side of the first arm (28) is horizontally provided with a first linkage part, and the side of the second arm (29) is provided with a second linkage part. The power rod (16) includes a first state, a second state, a third state and a fourth state; When the power rod (16) is in the first state, the first linkage part is in the first groove (20), the second linkage part is in the fifth groove (24), the top of the positioning pin is at the same height as the top of the first seat (2), and the positioning pin is in a stationary state. The linkage column (10) is located in the steering groove (6), and the clamping arm (11) is located on the side of the first seat (2) and the second seat (3). The clamping arm (11) moves downward and swings towards the second seat (3). When the power rod (16) is in the second state, the first linkage part is in the second groove (21), the second linkage part is in the sixth groove (25), the positioning pin moves upward and inserts into the pre-opened hole, the linkage column (10) is located at the bottom of the steering groove (6), the clamping arm (11) is in a stationary state, and there is a set gap between the clamping part (12) and the top of the workpiece; When the power rod (16) is in the third state, the first linkage part is in the third groove (22), the second linkage part is in the seventh groove (26), the linkage column (10) is in the descending groove (7), and the pressing part (12) descends and abuts against the top of the workpiece; When the power rod (16) is in the fourth state, the first linkage part is in the fourth groove (23), the second linkage part is in the eighth groove (27), the positioning pin moves downward, and the lifting column (9) moves upward.

5. The high-efficiency welding positioning system according to claim 4, characterized in that, The bottom of the first frame (13) is provided with a plurality of first arm bodies (28), and the bottom of the second frame (14) is provided with a plurality of second arm bodies (29). The first arm body (28) is provided with a first linkage part at both ends, and the second arm body (29) is provided with a second linkage part at both ends. Each first arm body (28) has a first power disk (18) on both sides, and the second arm body (29) has a second power disk (19) on both sides. The first linkage part and the second linkage part are both cylindrical, and the first linkage part is rotatably connected to the first arm body (28), and the second linkage part is rotatably connected to the second arm body (29).

6. The high-efficiency welding positioning system according to claim 3, characterized in that, Each workpiece is positioned by two positioning units. One positioning pin used to fix the same workpiece is a first pin (30), and the other positioning pin is a second pin (31). The top of the transition pin (8) connected to the first pin (30) is provided with a guide pin (32). The diameter of the guide pin (32) increases as the height decreases. The diameter of the bottom of the guide pin (32) is equal to the diameter of the top of the transition pin (8). The second pin (31) includes a bottom pin (31a) and a top pin (31b) located above the bottom pin (31a). The bottom pin (31a) is connected to the first frame (13). When the bottom pin (31a) is in a stationary state, the top pin (31b) can be lowered so that the top of the transition pin (8) is at the same height as the top of the first seat (2). When the bottom pin (31a) is raised, the bottom pin (31a) raises the top pin (31b) so that the top of the top pin (31b) is higher than the first seat (2) and inserted into the pre-drilled hole.

7. The high-efficiency welding positioning system according to claim 6, characterized in that, A first hole (33), a first receiving groove (34), a second hole (35), a second receiving groove (36), and a third hole (37) are sequentially opened through the first base body (2). The diameter of the first receiving groove (34) is larger than the diameter of the first hole (33) and the diameter of the second hole (35). The diameter of the second receiving groove (36) is larger than the diameter of the second hole (35) and the diameter of the third hole (37). The outer wall of the top pin (31b) is movably attached to the inner wall of the first hole (33) and the inner wall of the second hole (35). The outer wall of the bottom pin (31a) is movably attached to the inner wall of the third hole (37). A first synchronous disc (38) is provided on the outer wall of the top pin (31b). A first elastic element (39) is provided between the bottom of the first synchronous disc (38) and the bottom of the first receiving groove (34). The top of the second receiving groove (36) has two vertical grooves (40) vertically formed. The cross-section of the vertical groove (40) is rectangular. A vertical part (41) is vertically and movably arranged inside the vertical groove (40). The outer wall of the vertical part (41) is attached to the inner wall of the vertical groove (40). A horizontal part (42) is horizontally arranged at the bottom of the vertical part (41). An elastic part (43) is vertically arranged at the bottom of the inner side of the horizontal part (42). A clamping part (44) is arranged at the bottom of the elastic part (43). A clamping groove (45) with a semi-circular cross-section is vertically formed on the inner side of the clamping part (44). An inclined clamping slope (46) is formed on the outer side. The clamping part (44) is located on both sides of the bottom of the top pin part (31b). The top of the bottom pin (31a) is provided with a U-shaped drive part (47) with an upward opening. The drive part (47) is movably located in the second receiving groove (36). The inner walls on both sides of the drive part (47) are inclined drive slopes (48). The inclination direction of the drive slopes (48) is the same as the inclination direction of the clamping slopes (46) on the same side. The clamping part (44) includes a fifth state, a sixth state, a seventh state and an eighth state; When the clamping part (44) is in the fifth state, the top of the top pin (31b) is at the same height as the top of the first seat (2), the first synchronous disk (38) is lower than the top of the first receiving groove (34), the side of the top pin (31b) is separated from the clamping groove (45), the clamping inclined surface (46) is attached to the driving inclined surface (48), and the bottom of the clamping part (44) is higher than the middle of the driving part (47). When the clamping part (44) is in the sixth state, the top pin (31b) moves downward, and the top of the transition pin (8) is at the same height as the top of the first seat (2), and the side of the top pin (31b) is separated from the clamping groove (45). When the clamping part (44) is in the seventh state, the bottom pin part (31a) rises, the driving inclined surface (48) acts on the clamping inclined surface (46), and the two clamping parts (44) move closer to each other. There is a set pressure between the side wall of the top pin part (31b) and the inner wall of the clamping groove (45). The bottom pin part (31a), the driving part (47), and the top pin part (31b) rise synchronously, and the top of the top pin part (31b) is higher than the top of the first seat (2).

8. The high-efficiency welding positioning system according to claim 6, characterized in that, A stabilizing rod (49) is vertically arranged at the bottom of the top pin (31b), and a stabilizing groove (50) for the stabilizing rod (49) to enter is opened at the top of the bottom pin (31a). The outer wall of the stabilizing rod (49) is movably fitted to the inner wall of the stabilizing groove (50). A limiting cylinder (51) is vertically arranged at the top of the bottom pin (31a), and the top pin (31b) moves through the top of the limiting cylinder (51). A second synchronizing disc (52) is arranged on the outer wall of the top pin (31b), and the second synchronizing disc (52) is movably located inside the limiting cylinder (51). The bottom of the second synchronizing disc (52) is flush with the bottom of the limiting cylinder (51). A second elastic element (53) is provided between the walls and is in a continuously compressed state. The top of the limiting cylinder (51) is provided with two mirror-shaped synchronization parts (54). The opposing sides of the two synchronization parts (54) are synchronization surfaces (55). A cuboid synchronization block (56) is provided on the outer wall of the top pin part (31b). The synchronization block (56) is located below the top plate (1b) and between the two synchronization parts (54). The minimum distance between the synchronization surface (55) and the synchronization block (56) decreases as the height decreases. The bottom of the top plate (1b) is provided with a hole for the synchronization part (54) to enter. The bottom of the top plate (1b) is provided with two support plates (57). The bottom sides of the support plates (57) are provided with semi-circular support parts (58). The inner side of the support plates (57) is provided with J-shaped anti-fall parts (59). The anti-fall parts (59) are connected to the edges of the support plates (57) and the support parts (58). The synchronization block (56) is located between the two support plates (57), and the movement trajectory of the synchronization block (56) has a set gap with the support plates (57), the support parts (58) and the anti-fall parts (59). It also includes a cylindrical synchronization column (60), the two ends of which are movably attached to the inner sides of the two support plates (57) or the inner sides of the two support parts (58). There are two synchronization columns (60), which are located on both sides of the synchronization block (56). The synchronization column (60) includes an eighth state, a ninth state and a tenth state. When the synchronization column (60) is in the eighth state, the bottom of the synchronization column (60) is located in the opening at the bottom of the anti-fall part (59), and the synchronization column (60) is separated from the synchronization block (56), and the top of the second synchronization disk (52) abuts against the limiting cylinder (51). When the synchronizing post (60) is in the ninth state, the bottom pin (31a) rises, and the synchronizing surface (55) drives the synchronizing post (60) to move to the side of the synchronizing block (56); When the synchronizing post (60) is in the tenth state, the bottom pin (31a) and the top pin (31b) are relatively stationary.

9. A method for positioning using a high-efficiency welding positioning system as described in any one of claims 1-8, characterized in that, Includes the following steps: S1, place the workpiece horizontally on top of the first seat (2) and the second seat (3), and insert the transition pin (8) into the pre-drilled hole on the workpiece. S2, the lifting column (9) moves downward, and at the same time the clamping arm (11) swings until the clamping part (12) is above the workpiece; S3, the positioning pin is raised and inserted into the pre-drilled hole on the workpiece, and the clamping part (12) limits the workpiece that is lifted. S4, the lifting column (9) moves down again, the pressing part (12) abuts against the top of the workpiece, and the bottom of the workpiece abuts against the first seat (2) and the second seat (3); S5, welding is performed at the contact points of different workpieces; S6. After welding is completed, the lifting column (9) rises and the positioning pin descends to remove the welded workpiece.

10. A positioning fixture for welding automobile seats, characterized in that, Including a high-efficiency welding positioning system as described in any one of claims 1-8.

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