A workpiece positioning fixture system for welding and a positioning process thereof

Abstract

This invention discloses a workpiece positioning fixture system for welding and its positioning process, comprising a strip-shaped base with a fixed fixture seat at one end and a movable fixture seat slidably connected to the other end. Both fixture seats have horizontal support shafts on their lower opposite sides, each with multiple vertical limiting grooves. A threaded drive shaft is rotatably connected within the grooves, with a knob cap at the upper end of the shaft. A threaded sleeve, threaded and engaged with the drive shaft, is slidably connected within the grooves, with the sleeve extending inwards towards a horizontal pressure shaft. A strip-shaped mounting seat is located above the base, with a horizontal drive slide rail connected below it. Multiple hydraulic telescopic rods arranged in a V-shape are connected between the two. Two sliding clamping seats are slidably connected to the lower end of the slide rail. U-shaped clamping bars are rotatably connected to the opposite sides of each clamping seat. A threaded connection hole is opened on one side of each clamping bar, with a clamping bolt threaded into the hole. A drive nut is located at the outer end of the bolt. This system is suitable for large workpieces and possesses advantages such as high rigidity, strong adjustability, and convenient operation, filling a gap in the existing technology for positioning large steel structure welding.

Description

Technical Field

[0001] This invention belongs to the field of machining technology and relates to a workpiece positioning fixture system for welding and its positioning process. Background Technology

[0002] In the field of welding manufacturing, precise positioning and reliable clamping of workpieces are crucial for ensuring welding quality and improving production efficiency. As industrial manufacturing demands increasingly higher levels of structural precision and assembly consistency, workpiece displacement, deformation, or misalignment during welding can easily lead to poor weld formation, residual stress concentration, or even structural failure. Therefore, stable and accurate positioning and fixation of the workpiece before welding is of paramount importance.

[0003] To address these issues, welding workpiece positioning fixtures have been developed. These fixtures use mechanical limiting, clamping mechanisms, or magnetic attraction to constrain the workpiece to be welded in a preset position, effectively preventing displacement caused by welding thermal deformation, while improving assembly repeatability and operational safety. Currently, various types of welding positioning fixtures are available on the market, such as quick-clamping fixtures, modular combination fixtures, and dedicated welding jigs, which are widely used in industries such as automotive, shipbuilding, pressure vessels, and small steel structures.

[0004] However, existing welding positioning fixtures are mostly designed for small and medium-sized workpieces, with compact structures but limited load-bearing capacity, or are custom-developed only for parts of specific shapes and sizes, resulting in poor versatility. When welding large steel structural components (such as bridge segments, building steel columns, wind turbine towers, etc.), these fixtures are often unsuitable due to insufficient size, rigidity, or adjustment range. In actual production, operators usually rely on overhead cranes combined with manual pry bars or blocks to achieve rough positioning through repeated trial adjustments. This is not only inefficient and labor-intensive, but also makes it difficult to guarantee positioning accuracy and welding consistency, severely restricting the automation and high-quality manufacturing process of large welded structural components. Summary of the Invention

[0005] The purpose of this invention is to provide a workpiece positioning fixture system for welding and its positioning process, which is suitable for large workpieces and has the advantages of high rigidity, strong adjustability and convenient operation, so as to fill the gap in the field of welding positioning of large steel structures in the prior art.

[0006] To solve the above technical problems, the present invention provides a workpiece positioning fixture system for welding, including a strip-shaped base. A fixed fixture seat is provided at one end of the strip-shaped base facing upward. A movable fixture seat that slides along the length direction is slidably connected to the strip-shaped base. Horizontal support shafts are provided facing each other on the lower part of opposite sides of the fixed fixture seat and the movable fixture seat. Both the fixed fixture seat and the movable fixture seat have multiple vertical sliding grooves arranged along their height direction. Each vertical sliding groove has an opening on one side facing each other. A threaded drive shaft is rotatably connected in each vertical sliding groove. A knob cap is provided at the upper end of each threaded drive shaft, extending through the upper end of the fixed fixture seat or the movable fixture seat. A threaded sleeve that is threadedly connected to the corresponding threaded drive shaft is slidably connected to each vertical sliding groove. A horizontal pressure shaft that extends out of the corresponding vertical sliding groove is provided on the opposite side of each threaded sleeve.

[0007] A strip-shaped mounting base is provided above the strip-shaped base, and a horizontal drive slide rail is connected below the strip-shaped mounting base, also along its length. Multiple hydraulic telescopic rods are rotatably connected between the strip-shaped mounting base and the horizontal drive slide rail, and the multiple hydraulic telescopic rods are distributed in a V-shape. Two sliding clamping seats are slidably connected to the lower end of the horizontal drive slide rail. Each sliding clamping seat has a U-shaped clamping bar rotatably connected to one side facing each other. Each U-shaped clamping bar has a threaded connection hole on one side, and a clamping bolt is threaded into each threaded connection hole. A drive nut is provided at the outer end of each clamping bolt.

[0008] The invention is further configured such that each side of the strip-shaped base is provided with a connecting slide rail along its length, each connecting slide rail is slidably connected to a sliding seat, each sliding seat is vertically provided with a sliding column, each sliding column has an internal movable cavity at its upper end, each movable cavity has a downwardly provided lifting slide hole penetrating the corresponding sliding column and the corresponding sliding seat at its bottom, each lifting slide hole has an inner diameter smaller than the inner diameter of the corresponding movable cavity, each lifting slide hole is slidably connected to a lifting pressure shaft, each lifting pressure shaft has a rubber pressure shaft at its lower end, each lifting pressure shaft has a support plate with a larger outer diameter extending into the corresponding movable cavity at its upper end, each support plate and the bottom of the corresponding movable cavity are provided with a support spring that sleeves the corresponding lifting pressure shaft, each movable cavity is rotatably connected to an eccentric wheel that cooperates with the upper end of the corresponding support plate, and each eccentric wheel has a rocker handle extending out of the corresponding sliding column connected to its eccentric part;

[0009] Each sliding column is rotatably connected to a first rotating arm that rotates in a vertical plane at its upper end. Each first rotating arm is rotatably connected to a second rotating arm that rotates in a vertical plane at its free end. Each second rotating arm has a hollow magnetic positioning disk on one side of its free end. Each second rotating arm has a threaded adjustment hole that communicates with the corresponding magnetic positioning disk at its free end. Each threaded adjustment hole is threadedly connected to a threaded adjustment shaft. One end of each threaded adjustment shaft extends into the corresponding magnetic positioning disk and is equipped with a magnet. The other end of each threaded adjustment shaft extends out of the corresponding threaded adjustment hole and is equipped with an adjustment knob.

[0010] The present invention is further configured such that each connecting slide rail has a connecting groove on both sides, and each sliding seat has a connecting strip that extends into and slides in connection with the corresponding connecting groove.

[0011] The invention is further configured such that each sliding column is rotatably connected to a connecting sleeve that rotates in a vertical plane on its inward side, each connecting sleeve is slidably connected to a piston, each piston is connected to a connecting inner rod that extends away from the corresponding sliding column from the corresponding connecting sleeve, the free end of each connecting inner rod is rotatably connected to the corresponding second rotating arm, each connecting sleeve has a vent hole on its outer wall near the corresponding sliding column, each connecting sleeve is slidably connected to a sealing sleeve that can block the corresponding vent hole, each connecting sleeve has an external thread on its outer wall near the corresponding vent hole near the corresponding connecting inner rod, and each sealing sleeve has an internal thread that is threadedly connected to the corresponding external thread on its inner wall near the corresponding connecting inner rod.

[0012] The present invention is further configured such that both sides of the strip base are provided with limiting grooves arranged along its length direction, both sides of the lower end of the movable clamp seat are provided with limiting sliders that extend into the corresponding limiting grooves and are slidably connected thereto, each limiting slider is provided with a threaded clamping hole extending inward, each threaded clamping hole is threadedly connected to a clamping threaded shaft, and each clamping threaded shaft is provided with a clamping knob at its outer end.

[0013] The present invention is further configured such that each knob cap has an internal hexagonal socket at its upper end.

[0014] The present invention is further configured such that a linear motor is provided at the lower end of the horizontal drive slide rail along its length direction, and the linear motor is provided with two moving parts, each sliding clamp being connected to the corresponding moving part.

[0015] The invention is further configured such that each sliding clamp is provided with a rotating hole, and each U-shaped clamp is provided with a rotating shaft that is rotatably connected to the corresponding side away from its opening.

[0016] The invention is further configured such that each free end of each rotating shaft has an inwardly opening limit threaded hole, each limit threaded hole is threadedly connected to a limit threaded shaft, and each limit threaded shaft has a limit knob on the side of the corresponding sliding clamping seat away from the corresponding U-shaped clamping bar.

[0017] This invention also discloses a positioning process for a workpiece positioning fixture system for welding, comprising the following steps:

[0018] S1. Use a lifting device to lift the workpiece or steel plate to be welded onto the strip base, so that the lower side of one end of the workpiece rests on the horizontal support shaft on the fixed fixture seat, and move the movable fixture seat so that the lower side of the other end of the workpiece can rest on the horizontal support shaft on the movable fixture seat.

[0019] S2. Rotate the knob on the fixed fixture seat and the movable fixture seat to make the threaded drive shaft rotate, which drives the horizontal pressure shaft to press down on the upper sides of both ends of the workpiece, thereby achieving the positioning and fixing of the workpiece.

[0020] S3. If the part to be welded is a large plate-shaped workpiece, use a lifting tool to move it below the strip mounting base. Use the horizontal drive slide rail to move the two sliding clamping seats closer to the part. By rotating the clamping bolt, clamp the plate-shaped part and rotate the part as needed. Finally, the hydraulic telescopic rod extends, causing the horizontal drive slide rail to move the plate-shaped part downwards and closer to the workpiece fixed on the strip base. After the position of the plate-shaped part is adjusted, welding can be performed.

[0021] S4. If the part to be welded is a small sheet metal, move the sliding column on one side, and by rotating the first rotating arm and the second rotating arm, move the magnetic positioning plate to the position required for welding. Adjust the position of the part and place it on one side of the magnetic positioning plate. Rotate the threaded adjustment shaft to bring the magnetic plate closer to the part. By magnetically attracting the part, the part can be positioned and welded. After welding is completed, rotate the threaded adjustment shaft in the opposite direction to move the magnetic plate away from the part, so that the magnetic positioning plate can release the part.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] Firstly, the welding workpiece positioning fixture system of the present invention can accurately position large plate-shaped workpieces and small plate materials in different ways. For large plate-shaped workpieces, positioning and position adjustment can be completed by using lifting tools, sliding clamping seats, clamping bolts, etc. For small plate materials, flexible positioning can be achieved by using magnetic positioning plates, etc. It has a wide range of applications and can meet the welding needs of different types of workpieces.

[0024] Secondly, the system has a reasonable structural design. The inclusion of components such as the horizontal drive slide rail, hydraulic telescopic rod, first rotating arm, and second rotating arm allows the workpiece to be adjusted in multiple dimensions during the positioning process, such as horizontal movement and rotation, which greatly improves the positioning accuracy and better ensures the welding quality.

[0025] Thirdly, the operation process is relatively simple. The workpiece can be clamped and released by rotating the clamping bolts and adjusting the threaded shaft, which reduces the labor intensity of the operators, improves work efficiency, and reduces welding preparation time.

[0026] Fourth, the system has good stability. During the positioning and welding of the workpiece, the various components fit together closely, which can effectively prevent the workpiece from shaking and shifting, ensure the smooth progress of the welding process, and improve the reliability and consistency of the welding. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a partial sectional view used to show the internal structure of the movable fixture base;

[0029] Figure 3 Used to demonstrate the linear motor and sliding clamp under the horizontal drive slide rail;

[0030] Figure 4 An exploded view used to show the connection between the sliding clamp and the U-shaped clamping bar;

[0031] Figure 5 Used to display the sliding column, first rotating arm, and second rotating arm on the strip base;

[0032] Figure 6 This is a partial sectional view used to show the internal structure of the sliding column;

[0033] Figure 7 This is a partial cross-sectional view used to show the internal structure of the magnetic positioning disk;

[0034] Figure 8 Used to demonstrate the connection of the connecting sleeve, connecting inner rod, and sealing slide.

[0035] The components include: 1. Strip-shaped base; 2. Fixed clamp seat; 3. Movable clamp seat; 4. Limiting groove; 5. Limiting slider; 6. Threaded clamping hole; 7. Clamping bolt; 8. Clamping knob; 9. Horizontal support shaft; 10. Vertical groove; 11. Threaded drive shaft; 12. Knob cap; 13. Hex socket; 14. Threaded sleeve; 15. Horizontal pressure shaft; 16. Strip-shaped mounting base; 17. Horizontal drive slide rail; 18. Hydraulic telescopic rod; 19. Linear motor; 20. Mover; 21. Sliding clamp seat; 22. U-shaped clamping bar; 23. Rotary hole; 24. Rotary shaft; 25. Limiting threaded hole; 26. Limiting threaded shaft; 27. Limiting knob; 8. Threaded connection hole; 29. ​​Clamping bolt; 30. Drive nut; 31. Connecting slide rail; 32. Sliding seat; 33. Connecting slide groove; 34. Connecting slide bar; 35. Sliding column; 36. Movable cavity; 37. Lifting pressure shaft; 38. Rubber pressure shaft; 39. Support plate; 40. Support spring; 41. Eccentric wheel; 42. Crank handle; 43. First rotating arm; 44. Second rotating arm; 45. Magnetic positioning plate; 47. Threaded adjusting shaft; 48. Magnet plate; 49. Adjusting knob; 50. Connecting sleeve; 51. Piston; 52. Connecting inner rod; 53. Vent hole; 54. Sealing slide sleeve; 55. Connecting external thread; 56. Internal thread. Detailed Implementation

[0036] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a further detailed explanation of the welding workpiece positioning fixture system and its positioning process proposed in this invention. The advantages and features of this invention will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this invention. The same or similar reference numerals in the drawings represent the same or similar parts.

[0037] Implementation 1, refer to Figure 1-8 A workpiece positioning fixture system for welding includes a strip-shaped base 1. A fixed fixture seat 2 is provided at one end of the strip-shaped base 1, and a movable fixture seat 3 that slides along its length is slidably connected to the strip-shaped base 1. The fixed fixture seat 2 and the movable fixture seat 3 are used together to clamp large workpieces. A limiting groove 4 is provided on both sides of the strip-shaped base 1 along its length. A limiting slider 5 is provided on both sides of the lower end of the movable fixture seat 3, extending into the corresponding limiting groove 4 and slidably connected thereto. A threaded clamping hole 6 is provided through the limiting slider 5. A clamping bolt 7 is threadedly connected to each threaded clamping hole 6. A clamping knob 8 is provided on the outer end of each clamping bolt 7. By rotating the clamping bolt 7, the clamping bolt 7 abuts against the bottom of the limiting groove 4, thereby fixing the movable fixture seat 3 relative to the strip-shaped base 1.

[0038] Three horizontal support shafts 9 are arranged facing each other on the lower part of opposite sides of the fixed fixture base 2 and the movable fixture base 3. Each fixed fixture base 2 and the movable fixture base 3 has three vertical grooves 10 arranged along its height direction. Each vertical groove 10 has an opening on one facing side. A threaded drive shaft 11 is rotatably connected within each vertical groove 10. A knob cap 12 protrudes from the upper end of either the fixed fixture base 2 or the movable fixture base 3. An internal hexagonal socket 13 is formed at the upper end of each knob cap 12. A threaded sleeve 14, threadedly connected to the corresponding threaded drive shaft 11, is slidably connected to each vertical groove 10. A horizontal pressure shaft 15 extends out of the corresponding vertical groove 10 on one facing side of each threaded sleeve 14. The horizontal pressure shaft 15 and the horizontal support shafts 9 cooperate vertically to clamp both ends of the workpiece, achieving workpiece clamping and positioning.

[0039] A strip-shaped mounting base 16 is provided above the strip-shaped base 1, extending along its length. The strip-shaped mounting base 16 is installed on the top of the factory building. A horizontal drive slide rail 17, extending along its length, is connected below the strip-shaped mounting base 16. Four hydraulic telescopic rods 18 are rotatably connected between the strip-shaped mounting base 16 and the horizontal drive slide rail 17. The four hydraulic telescopic rods 18 are distributed in a V-shape. When all four hydraulic telescopic rods 18 extend simultaneously, the horizontal drive slide rail 17 descends; when all four hydraulic telescopic rods 18 retract simultaneously, the horizontal drive slide rail 17 rises. A linear motor 19, extending along its length, is provided at the lower end of the horizontal drive slide rail 17. The linear motor 19 has two moving parts 20, and the lower end of each moving part 20 is connected to a sliding clamping seat 21. The linear motor 19 drives the two sliding clamping seats 21 to slide arbitrarily along the slide rail.

[0040] Each sliding clamping seat 21 has a U-shaped clamping bar 22 rotatably connected to its opposite side. A rotating hole 23 is opened horizontally through each sliding clamping seat 21. Each U-shaped clamping bar 22 has a rotating shaft 24 rotatably connected to it on its side away from its opening. Each rotating shaft 24 has a limiting threaded hole 25 opened inward at its free end. Each limiting threaded hole 25 is threadedly connected to a limiting threaded shaft 26. Each limiting threaded shaft 26 has a limiting knob 27 on the side of the corresponding sliding clamping seat 21 away from the corresponding U-shaped clamping bar 22. Rotating the limiting knob 27 can pull the U-shaped clamping bar 22 to cooperate with it to clamp the sliding clamping seat 21, thereby fixing the angle of the U-shaped clamping bar 22, which facilitates arbitrary rotation of the workpiece at any angle and fixes the angle. Each U-shaped clamping bar 22 has two threaded connection holes 28 on one side, and each threaded connection hole 28 is threaded with a clamping bolt 29. Each clamping bolt 29 has a driving nut 30 at its outer end. When the end of the plate-shaped part extends into the U-shaped clamping bar 22, the clamping bolt 29 can be rotated to clamp the plate-shaped part and fix it in the U-shaped clamping bar 22 to prevent it from loosening.

[0041] The strip base 1 has a connecting slide rail 31 on both sides along its length. Each connecting slide rail 31 is slidably connected to a sliding seat 32. Each connecting slide rail 31 has a connecting groove 33 on both sides. Each sliding seat 32 is provided with a connecting strip 34 that extends into the corresponding connecting groove 33 and is slidably connected to it. Each sliding seat 32 has a vertically upward-facing sliding column 35. Each sliding column 35 has an internal movable cavity 36 at its upper end. Each movable cavity 36 has a downward-facing lifting slide hole (not shown) that passes through the corresponding sliding column 35 and the corresponding sliding seat 32. The inner diameter of each lifting slide hole is smaller than the inner diameter of the corresponding movable cavity 36. Each lifting slide hole is slidably connected to a lifting pressure shaft 37. Each lifting pressure shaft 37 has a rubber pressure shaft 38 at its lower end. Each lifting pressure shaft 37 has a support plate 39 with a larger outer diameter extending into the corresponding movable cavity 36 at its upper end. Each support plate 39 and the bottom of the corresponding movable cavity 36 are connected to a support spring 40 that is sleeved on the corresponding lifting pressure shaft 37. Each movable cavity 36 has an eccentric wheel 41 that cooperates with the upper end of the corresponding support plate 39. Each eccentric wheel 41 has a rocker handle 42 that extends out of the corresponding sliding column 35 connected to its eccentric part. Rotating the crank 42 causes the eccentric wheel 41 to rotate, pressing the support plate 39 downwards and compressing the support spring 40. This causes the lifting pressure shaft 37 to drive the rubber pressure shaft 38 downwards onto the connecting slide rail 31, thus restricting the sliding of the sliding seat 32. Rotating the crank 42 in the opposite direction causes the rubber pressure shaft 38 to move upwards away from the connecting slide rail 31 under the action of the support spring 40, allowing the sliding seat 32 to slide freely.

[0042] Each sliding column 35 has a first rotating arm 43 rotatably connected to its upper end, which rotates in a vertical plane. Each free end of the first rotating arm 43 is rotatably connected to a second rotating arm 44, which also rotates in a vertical plane. A hollow magnetic positioning disk 45 is provided on one side of the free end of each second rotating arm 44. A threaded adjustment hole (not shown) is provided through the free end of each second rotating arm 44 and communicates with the corresponding magnetic positioning disk 45. A threaded adjustment shaft 47 is threadedly connected to each threaded adjustment hole. One end of each threaded adjustment shaft 47 extends into the corresponding magnetic positioning disk 45 and contains a magnetic disk 48. The other end of each threaded adjustment shaft 47 extends out of the corresponding threaded adjustment hole and contains an adjustment knob 49. When the magnetic disk 48 is driven close to the part by the threaded adjustment shaft 47, the magnetic positioning disk 45 attracts the part. Reversing the rotation of the threaded adjustment shaft 47 moves the magnetic disk 48 away, thus releasing the part from the magnetic positioning disk 45.

[0043] Each sliding post 35 is rotatably connected to a connecting sleeve 50 that rotates in a vertical plane on its inward side. Each connecting sleeve 50 is slidably connected to a piston 51. Each piston 51 is connected to a connecting inner rod 52 that extends away from the corresponding sliding post 35 and into the corresponding connecting sleeve 50. The free end of each connecting inner rod 52 is rotatably connected to the corresponding second rotating arm 44. Each connecting sleeve 50 has a vent hole 53 on its outer wall near the corresponding sliding post 35. Each connecting sleeve 50 is slidably connected to a sealing sleeve 54 that can block the corresponding vent hole 53. Each connecting sleeve 50 has an external thread 55 on its outer wall near the corresponding vent hole 53 and the corresponding connecting inner rod 52. Each sealing sleeve has an internal thread 56 that is threadedly connected to the corresponding external thread 55 on its inner wall near the corresponding connecting inner rod 52. When the rotating sealing sleeve moves towards the connecting inner rod 52, it can loosen the vent hole 53, allowing air to freely enter and exit the connecting sleeve 50. The connecting inner rod 52 can extend and retract arbitrarily, and the rotation of the first rotating arm 43 and the second rotating arm 44 can be adjusted arbitrarily. When the sealing sleeve is rotated in the opposite direction to block the vent hole 53, the connecting inner rod 52 cannot extend or retract, and the positions of the first rotating arm 43 and the second rotating arm 44 are fixed and cannot rotate.

[0044] Example 2: A positioning process for a workpiece positioning fixture system for welding includes the following steps:

[0045] S1. Use a lifting device to lift the workpiece or steel plate to be welded onto the strip base 1, so that the lower side of one end of the workpiece rests on the horizontal support shaft 9 on the fixed fixture seat 2, and move the movable fixture seat 3 so that the lower side of the other end of the workpiece can rest on the horizontal support shaft 9 on the movable fixture seat 3. At the same time, rotate the clamping bolt 7 to abut against the limiting slide groove 4, so that the movable fixture seat 3 is fixed relative to the strip base 1.

[0046] S2. Rotate the knob cap 12 on the fixed fixture seat 2 and the movable fixture seat 3 to make the threaded drive shaft 11 rotate, which drives the horizontal pressure shaft 15 to press down on the upper side of both ends of the workpiece. The horizontal pressure shaft 15 and the horizontal support shaft 9 cooperate to clamp the two ends of the workpiece, thereby achieving the positioning and fixing of the workpiece.

[0047] S3. If the part to be welded is a large plate-shaped workpiece, use a lifting tool to move it below the strip mounting base 16. Use the horizontal drive slide rail 17 to bring the two sliding clamping seats 21 closer to the part. By rotating the clamping bolt 29, clamp the plate-shaped part and rotate the part as needed. Rotating the limit knob 27 can pull the U-shaped clamping bar 22 to cooperate with it to clamp the sliding clamping seat 21, thereby fixing the rotation angle of the part. Finally, the hydraulic telescopic rod 18 extends, causing the horizontal drive slide rail 17 to move the plate-shaped part downwards and closer to the workpiece fixed on the strip base 1. After the position of the plate-shaped part is adjusted, welding can be carried out.

[0048] S4. If the part to be welded is a small sheet metal, move the sliding column 35 on one side, and rotate the first rotating arm 43 and the second rotating arm 44 to move the magnetic positioning plate 45 to the required welding position. After adjusting the position, rotate the sealing sleeve to block the vent 53. At this time, the connecting inner rod 52 cannot extend or retract, and the positions of the first rotating arm 43 and the second rotating arm 44 are fixed and cannot be rotated. Place the part in the adjusted position on one side of the magnetic positioning plate 45, rotate the threaded adjustment shaft 47 to bring the magnetic plate close to the part, and the part can be positioned by magnetic attraction. After welding, rotate the threaded adjustment shaft 47 in the opposite direction to move the magnetic plate away from the part, and the magnetic positioning plate 45 can release the part.

[0049] 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.

[0050] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A workpiece positioning fixture system for welding, comprising a strip-shaped base (1), characterized in that, One end of the strip base (1) is provided with a fixed clamp seat (2) facing upwards. A movable clamp seat (3) that slides along its length direction is slidably connected to the strip base (1). Horizontal support shafts (9) are provided facing each other on the lower part of opposite sides of both the fixed clamp seat (2) and the movable clamp seat (3). Both the fixed clamp seat (2) and the movable clamp seat (3) have multiple vertical sliding grooves (4) arranged along their height direction. Each vertical sliding groove (4) has a horizontal support shaft (9) on opposite sides. Each vertical slide groove (4) is rotatably connected to a threaded drive shaft (11), and each threaded drive shaft (11) is provided with a knob cap (12) that passes through the upper end of the fixed clamp seat (2) or the movable clamp seat (3). Each vertical slide groove (4) is slidably connected to a threaded sleeve (14) that is threadedly connected to the corresponding threaded drive shaft (11). Each threaded sleeve (14) is provided with a horizontal pressure shaft (15) that extends out of the corresponding vertical slide groove (4) on the opposite side. A strip mounting seat (16) is provided above the strip base (1) along its length direction. A horizontal drive slide rail (17) is connected below the strip mounting seat (16). Multiple hydraulic telescopic rods (18) are rotatably connected between the strip mounting seat (16) and the horizontal drive slide rail (17). The multiple hydraulic telescopic rods (18) are distributed in a V-shape. Two sliding clamping seats (21) are slidably connected to the lower end of the horizontal drive slide rail (17). A U-shaped clamping bar (22) is rotatably connected to one side of each sliding clamping seat (21). A threaded connection hole (28) is opened on one side of each U-shaped clamping bar (22). A clamping bolt (29) is threadedly connected to each threaded connection hole (28). A drive nut (30) is provided at the outer end of each clamping bolt (29).

2. The workpiece positioning fixture system for welding according to claim 1, characterized in that, The strip base (1) is provided with connecting slide rails (31) on both sides along its length. Each connecting slide rail (31) is slidably connected to a sliding seat (32). Each sliding seat (32) is provided with a sliding column (35) vertically upward. Each sliding column (35) has a movable cavity (36) inside its upper end. Each movable cavity (36) has a lifting sliding hole that penetrates the corresponding sliding column (35) and the corresponding sliding seat (32) at its bottom. The inner diameter of each lifting sliding hole is smaller than the inner diameter of the corresponding movable cavity (36). A lifting pressure shaft is slidably connected in each lifting sliding hole. 37), each lifting pressure shaft (37) is provided with a rubber pressure shaft (38) at its lower end, and each lifting pressure shaft (37) is provided with a support plate (39) with a larger outer diameter extending into the corresponding movable cavity (36) at its upper end. Each support plate (39) is provided with a support spring (40) that is sleeved on the corresponding lifting pressure shaft (37) between the bottom of the corresponding movable cavity (36) and each movable cavity (36) is provided with an eccentric wheel (41) that cooperates with the upper end of the corresponding support plate (39). Each eccentric wheel (41) is connected to a rocker handle (42) that extends out of the corresponding sliding column (35) at its eccentric part. Each sliding column (35) is rotatably connected to a first rotating arm (43) that rotates in a vertical plane at its upper end. Each first rotating arm (43) is rotatably connected to a second rotating arm (44) that rotates in a vertical plane at its free end. Each second rotating arm (44) has a hollow magnetic positioning disk (45) on one side of its free end. Each second rotating arm (44) has a threaded adjustment hole that communicates with the corresponding magnetic positioning disk (45) at its free end. Each threaded adjustment hole is threadedly connected to a threaded adjustment shaft (47). One end of each threaded adjustment shaft (47) extends into the corresponding magnetic positioning disk (45) and is provided with a magnet disk (48). The other end of each threaded adjustment shaft (47) extends out of the corresponding threaded adjustment hole and is provided with an adjustment knob (49).

3. The workpiece positioning fixture system for welding according to claim 2, characterized in that, Each connecting slide rail (31) has a connecting groove (33) on both sides, and each sliding seat (32) is provided with a connecting slide bar (34) that extends into the corresponding connecting groove (33) and is slidably connected to it.

4. A workpiece positioning fixture system for welding according to claim 2, characterized in that, Each sliding column (35) is rotatably connected to a connecting sleeve (50) that rotates in a vertical plane on its inward side. Each connecting sleeve (50) is sealed and slidably connected to a piston (51). Each piston (51) is connected to a connecting inner rod (52) that extends away from the corresponding sliding column (35) and into the corresponding connecting sleeve (50). The free end of each connecting inner rod (52) is rotatably connected to the corresponding second rotating arm (44). Each connecting sleeve (50) has a vent hole (53) on its outer wall near the corresponding sliding column (35). Each connecting sleeve (50) is slidably connected to a sealing sleeve (54) that can block the corresponding vent hole (53). Each connecting sleeve (50) has an external thread (55) on its outer wall near the corresponding vent hole (53) and an internal thread (56) that is threadedly connected to the corresponding external thread (55) on its inner wall near the corresponding connecting inner rod (52).

5. A workpiece positioning fixture system for welding according to claim 2, characterized in that, Both sides of the strip base (1) are provided with limiting slide grooves (10) arranged along its length direction. Both sides of the lower end of the movable clamp seat (3) are provided with limiting sliders (5) that extend into the corresponding limiting slide grooves (10) and slide with them. Each limiting slider (5) is provided with a threaded clamping hole (6) that extends inward. Each threaded clamping hole (6) is threadedly connected to a clamping threaded shaft (7). Each clamping threaded shaft (7) is provided with a clamping knob (8) at its outer end.

6. A workpiece positioning fixture system for welding according to claim 2, characterized in that, Each knob cap (12) has an internal hexagon socket (13) at its upper end.

7. A workpiece positioning fixture system for welding according to claim 2, characterized in that, The lower end of the horizontal drive slide rail (17) is provided with a linear motor (19) arranged along its length direction. The linear motor (19) is provided with two movers (20), and each sliding clamp (21) is connected to the corresponding mover (20).

8. A workpiece positioning fixture system for welding according to claim 2, characterized in that, A rotating hole (23) is provided in each sliding clamp (21) horizontally, and a rotating shaft (24) is provided on the side of each U-shaped clamp (22) away from its opening, which is rotatably connected to the corresponding opening.

9. A workpiece positioning fixture system for welding according to claim 8, characterized in that, Each rotating shaft (24) has a limit threaded hole (25) opened inward at its free end. Each limit threaded hole (25) is threadedly connected to a limit threaded shaft (26). Each limit threaded shaft (26) has a limit knob (27) on the side of the corresponding sliding clamp (21) away from the corresponding U-shaped clamp (22).

10. The positioning process of a welding workpiece positioning fixture system according to any one of claims 2-9, characterized in that, Includes the following steps: S1. Use a lifting device to lift the workpiece or steel plate to be welded to the top of the strip base (1), so that the lower side of one end of the workpiece rests on the horizontal support shaft (9) on the fixed clamp seat (2), and move the movable clamp seat (3) so that the lower side of the other end of the workpiece can rest on the horizontal support shaft (9) on the movable clamp seat (3). S2. Rotate the knob cap (12) on the fixed fixture seat (2) and the movable fixture seat (3) to make the threaded drive shaft (11) rotate, which drives the horizontal pressure shaft (15) to press down on the upper side of both ends of the workpiece to achieve the positioning and fixing of the workpiece. S3. If the part to be welded is a large plate-shaped workpiece, use a lifting tool to move it below the strip mounting base (16), and use the horizontal drive slide rail (17) to bring the two sliding clamping seats (21) closer to the part. By rotating the clamping bolt (29), the plate-shaped part is clamped, and the part is rotated as needed. Finally, the hydraulic telescopic rod (18) extends, and the horizontal drive slide rail (17) drives the plate-shaped part downward to approach the workpiece fixed on the strip base (1). After the position of the plate-shaped part is adjusted, welding is performed. S4. If the part to be welded is a small plate, move the sliding column (35) on one side, and by rotating the first rotating arm (43) and the second rotating arm (44), move the magnetic positioning disk (45) to the position required for welding. Adjust the position of the part and place it on one side of the magnetic positioning disk (45). Rotate the threaded adjustment shaft (47) to bring the magnetic disk close to the part. By magnetically attracting the part, the part can be positioned and welded. After welding is completed, rotate the threaded adjustment shaft (47) in the opposite direction to move the magnetic disk away from the part, so that the magnetic positioning disk (45) can release the part.

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