A quick positioning fixture for sheet metal machining

Abstract

This invention provides a quick positioning fixture for sheet metal processing, belonging to the field of fixture technology. It addresses the problem that existing positioning fixtures, when using suction cups to hold and fix spliced ​​automotive sheet metal, often experience slippage and sheet metal falling during welding. The invention comprises a mounting base, a fixing frame, and a mounting plate. The bottom of the mounting plate is evenly spaced with electric lifting rods, a positioning plate, and positioning suction cups to hold and fix the automotive sheet metal. L-shaped baffles and limiting rods restrict the edges of the sheet metal, ensuring precise welding. Hydraulic push rods, auxiliary components, and auxiliary support plates work together. During operation, the hydraulic telescopic rod pushes a pusher wheel to contact the outer edge of the sheet metal. The pusher wheel drives an adjusting rope, causing the positioning shaft to rotate, which in turn slides the clamping plate to the bottom to clamp and fix the sheet metal. Together with the positioning suction cups, this ensures stable welding operations and effectively solves the problem of sheet metal falling due to slippage. It is also convenient to use.

Description

Technical Field

[0001] This invention relates to the field of fixture technology, and more specifically, to a quick positioning fixture for sheet metal processing. Background Technology

[0002] In the automotive manufacturing industry, sheet metal processing is crucial. Currently, with the rapid development of the automotive industry, the requirements for vehicle quality, performance, and production efficiency are constantly increasing, which has spurred the emergence of rapid positioning fixtures for sheet metal processing in automotive manufacturing. Existing positioning fixtures generally use suction cups to adsorb and fix manually assembled sheet metal, then bring it together before welding.

[0003] For example, patent CN213530372U discloses a vacuum suction cup positioning fixture, which includes a base plate with suction holes. One side of the base plate is connected to a suction device communicating with the suction holes, and the other side is connected to a sealing layer covering the suction holes. The side of the sealing layer away from the base plate is connected to the product. This application has the effect of reducing the impact of waste on product quality and can also clamp multiple similar products for processing. However, existing positioning fixtures, when using suction cups to adsorb and splice sheet metal and then pushing all the sheet metal together for welding, are prone to unstable suction of the sheet metal, causing the sheet metal to fall off and affecting the welding process of automotive sheet metal.

[0004] Therefore, a quick positioning fixture for sheet metal processing is introduced. Summary of the Invention

[0005] The purpose of this invention is to provide a quick positioning fixture for sheet metal processing, which aims to solve the problem in the above-mentioned background art that when existing positioning fixtures use suction cups to adsorb and fix spliced ​​automotive sheet metal, the suction cups are easily loosened and the sheet metal falls off when the sheet metal is pushed together for welding.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a quick positioning fixture for sheet metal processing, comprising a mounting base and a fixed frame fixedly connected to the bottom of the mounting base, a mounting plate fixedly connected to the lower end of the fixed frame, an electric lifting rod fixedly connected at even intervals to the bottom of the mounting plate, a plurality of positioning plates fixed to the lower end of the electric lifting rod, adjacent positioning plates arranged in the shape of an automobile door ring, a positioning suction cup fixedly connected to the positioning plate, the bottom of the positioning suction cup adsorbing and fixing the automobile sheet metal to be welded, a hydraulic push rod fixedly connected at even intervals to the bottom of the mounting plate on the outer side of the automobile sheet metal, an auxiliary component fixedly connected to the end of the hydraulic push rod; the auxiliary component includes a U-shaped plate fixedly connected to the end of the hydraulic push rod and a limiting hole opened on the bottom plate of the U-shaped plate, a movable hanging column movably engaged in the limiting hole, a pushing wheel sleeved on the outer wall of the movable hanging column between the upper and lower bottom plates of the U-shaped plate, and an auxiliary support plate movably arranged on the top of the lower bottom plate of the U-shaped plate;

[0007] The auxiliary support plate includes a positioning box and a fixed column fixedly connected to the side wall of the positioning box. The top of the fixed column is fixedly connected to the bottom of the lower base plate of the U-shaped plate. A positioning shaft is movably connected to the inner base plate of the positioning box. The top plate of the positioning shaft extends through to the outside of the top plate of the positioning box. A spring is fixedly sleeved on the outer wall of the positioning shaft inside the positioning box. The outer end of the spring is fixedly adjacent to the inner wall of the positioning box. An adjusting rope is wound on the outer wall of the positioning shaft below the spring. The other end of the adjusting rope passes through the side wall of the positioning box and the lower base plate of the U-shaped plate and is fixedly connected to the bottom of the movable hanging column. A rotating plate is fixedly connected to the outer wall of the positioning shaft above the positioning box. Support springs are fixedly connected at even intervals at the top end of the rotating plate. A clamping plate is fixedly connected to the top of the support springs.

[0008] Furthermore, the fixing posts are evenly spaced on the outer wall of the circumferential arc surface of three-quarters of the positioning box, and the positioning box is fixed to the middle edge of the lower end of the bottom plate of the U-shaped plate away from the hydraulic push rod by the fixing posts.

[0009] Furthermore, when the top of the rotating plate is attached to the bottom surface of the lower base plate of the U-shaped plate, and the movable hanging column is located at the end of the limiting hole away from the hydraulic push rod, the rotating plate is perpendicular to the movable hanging column. At this time, the spring remains in a normally relaxed state.

[0010] Furthermore, the spring is kept in a normally relaxed state, the clamping plate is located on one side of the U-shaped plate, and the top surface of the clamping plate is set at a height higher than the top surface of the bottom plate of the U-shaped plate. The two sides of the clamping plate are respectively fixedly connected with downwardly inclined side plates.

[0011] Furthermore, the clamping plate is provided with rollers that are evenly spaced and movably fitted on the top. The clamping plate is provided with a hollow cavity at the adjacent rollers. A worm is fixedly connected to the outer wall of one side of the roller and extends through into the hollow cavity. A worm wheel is rotatably provided inside the hollow cavity. The worm wheel meshes with the worm and has a threaded hole in the middle. A guide channel is provided on the top of the clamping plate at the corresponding threaded hole. A positioning screw is movably fitted in the threaded hole and the top of the positioning screw is movably engaged in the guide channel.

[0012] Furthermore, an annular inner groove is provided on the outer wall of the middle part of the extrusion roller, and two sets of identical elastic components are fixedly connected side by side on the inner wall of the side plate between the upper and lower bottom plates of the U-shaped plate. An arc plate is fixedly connected to the end of the elastic component, and the arc plate is movably engaged with the arc-shaped outer wall of the upper and lower sides of the annular inner groove on the extrusion roller.

[0013] Furthermore, the pusher wheel at the annular groove has evenly spaced installation cavities inside. The inner wall of the installation cavity away from the annular groove has a sliding groove. The inner walls at the upper and lower ends of the installation cavity adjacent to the sliding groove are respectively fixedly connected to a return spring. The ends of the return springs are respectively fixedly connected to a movable clamping plate. The movable clamping plates are movably engaged in the sliding groove. The side wall of the installation cavity adjacent to the annular groove has a limiting groove corresponding to the movable clamping plate. After the other end of the movable clamping plate is movably engaged in the limiting groove, the end extends into the annular groove.

[0014] Furthermore, a movable groove is provided downward through the middle of the top of the movable clamping plate. A U-shaped rod is movably engaged in the movable groove of the movable clamping plate inside the annular inner groove. The upper and lower support rods of the U-shaped rod are movably disposed through the side wall of the mounting cavity outside the limiting groove, and the ends of the upper and lower support rods of the U-shaped rod extend into the mounting cavity. A movable plate is fixedly connected to the end of the U-shaped rod support rod in the mounting cavity. The movable plate is movably engaged in the movable groove, and the upper and lower ends of the movable plate are respectively attached to the inner walls of the upper and lower ends of the mounting cavity. A cable bundle tube is fixedly connected to the inner wall of the mounting cavity between the limiting grooves. A traction rope is fixedly connected to the movable clamping plates on the upper and lower sides of the cable bundle tube. The traction rope passes through the side walls of the upper and lower ends of the cable bundle tube and exits from the end port of the cable bundle tube. The end of the traction rope is fixedly connected to the side wall of the movable plate after exiting the end port of the cable bundle tube.

[0015] Furthermore, the hydraulic push rod includes a fixed base fixedly connected to the bottom of the mounting plate and a hydraulic cylinder fixedly connected to the bottom of the fixed base. A hydraulic telescopic rod is fixedly connected to the output end of the hydraulic cylinder, and a reinforcing plate is fixedly connected to the end of the hydraulic telescopic rod. The end of the reinforcing plate is fixedly connected to an auxiliary component, and a U-shaped protective cover is fixedly connected to the bottom of the mounting plate outside the hydraulic cylinder.

[0016] Furthermore, L-shaped baffles are fixedly connected at even intervals to the bottom of the mounting plates on both sides of the positioning plate, and limiting rods are fixedly connected to the bottom of the mounting plates between adjacent positioning plates. The limiting rods include a U-shaped seat fixedly connected to the bottom of the mounting plate and a positioning rod fixedly connected to the side walls at both ends of the U-shaped seat. A cover plate is fitted on the outer wall of the positioning rod, and an electric telescopic push rod is fixedly connected to the lower end of the top plate of the U-shaped seat between the positioning rods. A through hole is opened on the cover plate corresponding to the electric telescopic push rod, and the lower end of the electric telescopic push rod extends into the through hole. A calibration stop rod is fixedly connected to the bottom of the electric telescopic push rod in the through hole.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] This invention proposes a rapid positioning fixture for sheet metal processing. It uses components such as a mounting base, a fixing frame, a mounting plate, and a positioning suction cup to adsorb and fix automotive sheet metal. An L-shaped baffle restricts the edges of the sheet metal, and a calibration stop of the limiting rod helps the sheet metal form a basic splicing shape, facilitating precise welding. After the sheet metal is adsorbed and fixed, a hydraulic telescopic rod pushes a pusher wheel to fit against the outer edge of the sheet metal. The pusher wheel drives an adjusting rope to rotate the positioning shaft, retracting a spring. The rotating plate then drives the clamping plate to slide to the bottom, clamping and fixing the sheet metal. Thus, when the sheet metal moves and assembles, the clamping plate and the positioning suction cup work together to prevent the sheet metal from falling, ensuring stable welding operations. This fixture is easy to use and improves the efficiency and quality of automotive sheet metal processing, providing reliable support for automobile manufacturing. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall upright structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the overall inverted state structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the mounting structure of the mounting plate, positioning plate, and hydraulic push rod of the present invention;

[0022] Figure 4 This is a schematic diagram of the installation structure of the hydraulic push rod and auxiliary components of the present invention;

[0023] Figure 5 This is a schematic diagram of the auxiliary component structure of the present invention;

[0024] Figure 6 This is a schematic diagram of the auxiliary support plate structure of the present invention;

[0025] Figure 7 This is a schematic cross-sectional view of the positioning box of the present invention;

[0026] Figure 8 This is a schematic diagram of the cross-section of the extrusion wheel of the present invention;

[0027] Figure 9 This is a schematic cross-sectional view of the movable clamping plate of the present invention;

[0028] Figure 10 This is a schematic diagram of the limiting rod of the present invention;

[0029] Figure 11 This is a partial cross-sectional schematic diagram of the clamping plate of the present invention.

[0030] In the diagram: 1. Mounting base; 2. Fixing frame; 3. Mounting plate; 31. Electric lifting rod; 32. Positioning plate; 33. Positioning suction cup; 4. Automotive sheet metal; 5. Hydraulic push rod; 51. Fixing base; 52. Hydraulic cylinder; 53. Hydraulic telescopic rod; 54. Reinforcing plate; 6. U-shaped cover; 7. Auxiliary parts; 71. U-shaped plate; 72. Limiting hole; 73. Moving hanging column; 74. Push roller; 741. Mounting cavity; 742. Return spring; 743. Moving clamp; 744. Limiting groove; 745. Movable groove; 746. U-shaped rod; 747. Moving plate; 748. Cable bundle. 749. Traction rope; 75. Auxiliary support plate; 751. Positioning box; 752. Fixing column; 753. Positioning shaft; 754. Clockwork spring; 755. Adjusting rope; 756. Rotating plate; 757. Support spring; 758. Clamping plate; 7581. Roller; 7582. Worm gear; 7583. Worm wheel; 7584. Guide channel; 7585. Positioning screw; 76. Elastic component; 77. Arc plate; 8. Limiting rod; 81. U-shaped seat; 82. Positioning rod; 83. Cover plate; 84. Electric telescopic push rod; 85. Through hole; 86. Calibration stop bar; 9. L-shaped baffle. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figures 1-3 and Figure 10A quick positioning fixture for sheet metal processing is disclosed. The fixture consists of a mounting base 1, a fixing frame 2, a mounting plate 3, an electric lifting rod 31, a positioning plate 32, and a positioning suction cup 33. A square fixing frame 2 is fixedly connected to the bottom of the mounting base 1. A square mounting plate 3 is fixedly connected to the lower end of the fixing frame 2. An electric lifting rod 31 is fixedly connected to the bottom of the mounting plate 3 at even intervals. Several positioning plates 32 are fixed to the lower end of the electric lifting rod 31. Adjacent positioning plates 32 are arranged in the shape of an automobile door ring. A positioning suction cup 33 is fixedly connected to the positioning plate 32. The bottom of the positioning suction cup 33 is adsorbed and fixed with an automobile sheet metal 4 to be welded. The automobile sheet metal 4 can be welded into an automobile door ring after being spliced ​​together.

[0033] L-shaped baffles 9 are evenly spaced and fixedly connected to the bottom of the mounting plates 3 on both sides of the positioning plate 32. The L-shaped baffles 9 are used to restrict the edge of the automotive sheet 4 extending to the outside of the positioning plate 32. Limiting rods 8 are fixedly connected to the bottom of the mounting plates 3 between adjacent positioning plates 32. The limiting rods 8 include a U-shaped seat 81 fixedly connected to the bottom of the mounting plate 3 and a positioning rod 82 fixedly connected between the two side walls of the U-shaped seat 81. A cover plate 83 is sleeved on the outer wall of the positioning rod 82. An electric telescopic push rod 84 is fixedly connected to the lower end of the top plate of the U-shaped seat 81 between the positioning rods 82. The cover plate 83 is corresponding to the electric telescopic push rod 84. A through hole 85 is provided, and the lower end of the electric telescopic push rod 84 extends into the through hole 85. A calibration stop rod 86 is fixedly connected to the bottom of the electric telescopic push rod 84 in the through hole 85. The calibration stop rod 86 is erected side by side between the gaps of adjacent automotive sheet metal 4, so that the automotive sheet metal 4 can form a basic splicing shape with a small gap after it is attached to the outer wall of the calibration stop rod 86. Thus, when the electric telescopic push rod 84 controls the calibration stop rod 86 to rise and pull away from the gap of the automotive sheet metal 4, and pushes the outer side of the automotive sheet metal 4 to gather and attach to the middle, it prevents the automotive sheet metal 4 from excessively deviating and deforming, which is conducive to the precise welding of the automotive sheet metal 4.

[0034] To address the issue that existing positioning fixtures, which use suction cups to hold and fix assembled automotive sheet metal 4, often experience loosening of the suction cups and cause the sheet metal to fall off during welding, please refer to [link to relevant documentation]. Figures 1-7 The following preferred technical solutions are provided:

[0035] Hydraulic push rods 5 are evenly spaced and fixedly connected to the bottom of the mounting plate 3 on the outer side of the automotive sheet 4. The hydraulic push rods 5 include a fixed seat 51 fixedly connected to the bottom of the mounting plate 3 and a hydraulic cylinder 52 fixedly connected to the bottom of the fixed seat 51. A hydraulic telescopic rod 53 is fixedly connected to the output end of the hydraulic cylinder 52. A reinforcing plate 54 is fixedly connected to the end of the hydraulic telescopic rod 53. The end of the reinforcing plate 54 is fixedly connected to the auxiliary component 7. A U-shaped cover 6 is fixedly connected to the bottom of the mounting plate 3 outside the hydraulic cylinder 52. The U-shaped cover 6 covers the fixed seat 51 and the hydraulic cylinder 52 to isolate and protect them. The auxiliary component 7 includes a U-shaped plate 71 fixedly connected to the end of the hydraulic push rod 5 and a limiting hole 72 opened on the bottom plate of the U-shaped plate 71. A movable hanging column 73 is movably engaged in the limiting hole 72. A pushing wheel 74 is sleeved on the outer wall of the movable hanging column 73 between the upper and lower bottom plates of the U-shaped plate 71. An auxiliary support plate 75 is movably arranged on the top of the lower bottom plate of the U-shaped plate 71.

[0036] The auxiliary support plate 75 includes a positioning box 751 and a fixing post 752 fixedly connected to the side wall of the positioning box 751. The top of the fixing post 752 is fixedly connected to the bottom of the lower base plate of the U-shaped plate 71. A positioning shaft 753 is movably connected to the inner base plate of the positioning box 751. The top plate of the positioning shaft 753 extends through to the outside of the top plate of the positioning box 751. A spring-loaded spring 754 is fixedly sleeved on the outer wall of the positioning shaft 753 inside the positioning box 751. The outer end of the spring-loaded spring 754 is attached to the inner wall of the positioning box 751. An adjusting rope 755 is wound on the outer wall of the positioning shaft 753 below the clock spring 754. The other end of the adjusting rope 755 passes through the side wall of the positioning box 751 and the bottom plate of the U-shaped plate 71, and the end is fixedly connected to the bottom of the movable hanging column 73. A rotating plate 756 is fixedly connected to the outer wall of the positioning shaft 753 above the positioning box 751. Support springs 757 are fixedly connected at even intervals at the top end of the rotating plate 756. A clamping plate 758 is fixedly connected to the top of the support springs 757.

[0037] The fixed posts 752 are evenly distributed on the outer wall of the circumferential arc surface of the positioning box 751 at three-quarters of the distance. The positioning box 751 is fixed to the middle edge of the lower end of the U-shaped plate 71 on the side away from the hydraulic push rod 5 by the fixed posts 752. The top of the rotating plate 756 is set to fit against the bottom surface of the lower end of the U-shaped plate 71. When the moving hanging column 73 is located at the end of the limiting hole 72 on the side away from the hydraulic push rod 5, the rotating plate 756 is set perpendicular to the moving hanging column 73. At this time, the spring 754 remains in a normally relaxed state.

[0038] The spring 754 is kept in a normal relaxed state. The clamping plate 758 is located on one side of the U-shaped plate 71, and the top surface of the clamping plate 758 is set at a height higher than the top surface of the bottom plate of the U-shaped plate 71. The clamping plate 758 is fixedly connected to downward inclined side plates on both sides.

[0039] Specifically, after the worker has pre-fixed the car sheet 4 using the positioning suction cup 33 and formed a basic splicing shape by adhering the car sheet 4 to the outer wall of the limiting rod 8, when welding is required on the car sheet 4, the electric telescopic push rod 84 controls the calibration stop 86 to rise and pull away from the gap of the car sheet 4. The hydraulic telescopic rod 53 is driven to extend under the control of the hydraulic telescopic rod 53. The hydraulic telescopic rod 53 pushes the extrusion roller 74 between the U-shaped plates 71 to adhere to the outer edge of the car sheet 4. Due to the adsorption and fixation of the positioning suction cup 33, the extrusion roller 74 is subjected to a counter-pushing force, causing it to move towards the side plate of the U-shaped plate 71 through the limiting hole 72 on the bottom plate of the U-shaped plate 71 by the moving hanging column 73. During the movement of the extrusion roller 74, the adjusting rope 755 moves, and the adjusting rope 755 pushes the positioning shaft 753 to rotate in the positioning box 751, contracting the spring spring 754. When the positioning shaft 753 rotates, it causes... The rotating plate 756 on one side of the U-shaped plate 71 rotates and moves towards the bottom of the automotive sheet 4. The clamping plate 758 at the top of the end of the rotating plate 756 slides from the edge of the automotive sheet 4 to the bottom of the automotive sheet 4 using the guide of the inclined side walls on both sides. Under the action of the support spring 757, it clamps and fixes the automotive sheet 4. After clamping, the hydraulic telescopic rod 53 continues to use the U-shaped plate 71 and the extrusion roller 74 to move the automotive sheet 4, which is fixed by the positioning suction cup 33, towards the center of the arrangement shape of the positioning plate 32. This makes the edges of adjacent automotive sheet 4 completely fit together. The clamping plate 758 extends into the bottom of the automotive sheet 4 and works with the positioning suction cup 33 to clamp it, preventing the sheet from falling off due to unstable adsorption of the positioning suction cup 33 when the hydraulic telescopic rod 53 pushes the automotive sheet 4 to move and close. This is conducive to the stable progress of the welding work of the automotive sheet 4 and is convenient to use.

[0040] To prevent the clamping plate 758 from being scratched when it rotates and moves to the bottom of the automotive sheet 4 along with the rotating plate 756, such as Figure 11 As shown, this embodiment provides the following preferred technical solutions:

[0041] The clamping plate 758 has rollers 7581 that are evenly spaced and movably fitted on its top. The top of the rollers 7581 extends above the clamping plate 758. The clamping plate 758 adjacent to the rollers 7581 has a hollow cavity inside. A worm gear 7582 is fixedly connected to the outer wall of one side of the rollers 7581. The worm gear 7582 extends through into the hollow cavity. A worm wheel 7583 is rotatably installed inside the hollow cavity. The worm wheel 7583 meshes with the worm gear 7582, and a threaded hole is provided in the middle of the worm wheel 7583. A guide channel 7584 is opened on the top of the clamping plate 758 corresponding to the threaded hole. A positioning screw 7585 is movably fitted in the threaded hole. The top of the positioning screw 7585 is movably engaged in the guide channel 7584.

[0042] Specifically, after the clamping plate 758 rotates and moves to the bottom of the automotive sheet 4 with the rotating plate 756, the top of the roller 7581 adheres to the bottom plate of the automotive sheet 4. When the rotating plate 756 rotates and moves, the roller 7581 rolls against the bottom plate of the automotive sheet 4. When the roller 7581 rolls and rotates, it uses the worm gear 7582 to mesh and drive the worm wheel 7583 in the hollow cavity to rotate. The worm wheel 7583 uses its own threaded hole to drive the positioning screw 7585 to rotate, so that the positioning screw 7585 moves upward in the guide channel 7584, thereby extending the top of the positioning screw 7585 out of the guide channel 7584 port at the top of the clamping plate 758. The positioning screw 7585 is used to clamp and support the bottom of the automotive sheet 4. The rolling of the roller 7581 reduces the friction between it and the bottom of the automotive sheet 4, effectively avoiding friction and scratches caused by the clamping plate 758 rotating and extending into the bottom of the automotive sheet 4 for clamping, and ensuring the integrity and safety of the automotive sheet 4 during welding and splicing.

[0043] To further ensure the stability of the automotive sheet 4 when it is pushed together, such as Figure 4 , Figure 5 and Figures 8-9 As shown, this embodiment provides the following preferred technical solutions:

[0044] An annular groove is provided on the outer wall of the middle part of the extrusion roller 74. Two sets of identical elastic components 76 are fixedly connected side by side on the inner wall of the side plate between the upper and lower bottom plates of the U-shaped plate 71. An arc plate 77 is fixedly connected to the end of the elastic component 76. The arc plate 77 is movably engaged with the arc surface outer wall of the upper and lower sides of the annular groove on the extrusion roller 74.

[0045] The pusher roller 74 at the annular groove has evenly spaced installation cavities 741 inside. The inner wall of the installation cavity 741 away from the annular groove has a sliding groove. The inner walls of the upper and lower ends of the installation cavity 741 adjacent to the sliding groove are respectively fixedly connected to a return spring 742. The ends of the return spring 742 are respectively fixedly connected to a movable clamping plate 743. The movable clamping plate 743 is movably engaged in the sliding groove. The side wall of the installation cavity 741 adjacent to the annular groove has a limiting groove 744 corresponding to the movable clamping plate 743. The other end of the movable clamping plate 743 is movably engaged in the limiting groove 744 and then extends into the annular groove.

[0046] A movable groove 745 is formed at the top center of the movable clamping plate 743, extending downwards. A U-shaped rod 746 is movably engaged within the movable groove 745 inside the annular inner groove of the movable clamping plate 743. The support rods at both ends of the U-shaped rod 746 movably pass through the side wall of the mounting cavity 741 outside the limiting groove 744, and the ends of the support rods at both ends of the U-shaped rod 746 extend into the mounting cavity 741. A movable plate 747 is fixedly connected to the end of the support rod of the U-shaped rod 746 in the mounting cavity 741, and the movable plate 747 movably engages with the movable clamping plate 743. Inside the groove 745, the upper and lower ends of the movable plate 747 are respectively attached to the inner walls of the upper and lower ends of the mounting cavity 741. A cable tie 748 is fixedly connected to the inner wall of the mounting cavity 741 between the limiting grooves 744. A traction rope 749 is fixedly connected to the movable clamps 743 on the upper and lower sides of the cable tie 748. The traction rope 749 passes through the side walls of the upper and lower ends of the cable tie 748 and then exits from the port at the end of the cable tie 748. The end of the traction rope 749 passes through the port of the cable tie 748 and is fixedly connected to the side wall of the movable plate 747.

[0047] Specifically, the hydraulic telescopic rod 53 is extended under the control of the hydraulic telescopic rod 53. The hydraulic telescopic rod 53 pushes the extrusion roller 74 to fit against the outer edge of the automotive sheet 4, so that the annular inner groove of the extrusion roller 74 engages with the outer wall of the automotive sheet 4. This causes the movable clamping plate 743 to be suspended at the upper and lower ends of the edge of the automotive sheet 4. As the extrusion roller 74 moves towards the automotive sheet 4, the U-shaped rod 746 gradually moves towards the mounting cavity 741 under the counter-thrust. The support rod ends at the upper and lower ends of the U-shaped rod 746 push the movable plate 747 towards the return spring 742 within the mounting cavity 741. The movable plate 747 moves... When the traction rope 749 moves, under the limiting guidance of the cable tie 748, the traction rope 749 pulls the moving clamps 743 on the upper and lower sides of the cable tie 748 to move towards each other and move closer to each other, so as to stretch the return spring 742. The ends of the moving clamps 743 move closer in the limiting groove 744 on the inner side wall of the annular groove, and finally fit against the outer walls of the upper and lower ends of the edge of the car sheet 4, thereby automatically realizing the clamping and fixing of the moving clamps 743 on the car sheet 4, further ensuring the stability of the car sheet 4 when the hydraulic telescopic rod 53 pushes the car sheet 4 to move and close for splicing.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A quick positioning fixture for sheet metal processing, comprising a mounting base and a fixing frame fixedly connected to the bottom of the mounting base, wherein a mounting plate is fixedly connected to the lower end of the fixing frame, characterized in that: The bottom of the mounting plate is fixedly connected with an electric lifting rod at even intervals. Several positioning plates are fixed at the lower end of the electric lifting rod. Adjacent positioning plates are arranged in the shape of a car door ring. Positioning suction cups are fixedly connected to the positioning plates. The bottom of the positioning suction cups adsorbs and fixes the car sheet to be welded. Hydraulic push rods are fixedly connected at even intervals to the bottom of the mounting plate on the outer side of the car sheet. An auxiliary component is fixedly connected to the end of the hydraulic push rod. The auxiliary component includes a U-shaped plate fixedly connected to the end of the hydraulic push rod and a limiting hole opened on the bottom plate of the U-shaped plate. A movable hanging column is movably engaged in the limiting hole. A pushing wheel is sleeved on the outer wall of the movable hanging column between the upper and lower bottom plates of the U-shaped plate. An auxiliary support plate is movably arranged on the top of the lower bottom plate of the U-shaped plate. The auxiliary support plate includes a positioning box and a fixed column fixedly connected to the side wall of the positioning box. The top of the fixed column is fixedly connected to the bottom of the U-shaped plate. A positioning shaft is movably connected to the bottom plate inside the positioning box. The top plate of the positioning shaft extends through to the outside of the top plate of the positioning box. A spring is fixedly sleeved on the outer wall of the positioning shaft inside the positioning box. The outer end of the spring is fixedly adjacent to the inner wall of the positioning box. An adjustment rope is wound on the outer wall of the positioning shaft below the spring. The other end of the adjustment rope passes through the side wall of the positioning box and the bottom plate of the U-shaped plate and is fixedly connected to the bottom of the movable hanging column. A rotating plate is fixedly connected to the outer wall of the positioning shaft above the positioning box. Support springs are fixedly connected at even intervals at the top end of the rotating plate. A clamping plate is fixedly connected to the top of the support spring. L-shaped baffles are fixedly connected at even intervals to the bottom of the mounting plates on both sides of the positioning plate. Limiting rods are fixedly connected to the bottom of the mounting plates between adjacent positioning plates. The limiting rods include a U-shaped seat fixedly connected to the bottom of the mounting plate and a positioning rod fixedly connected between the two side walls of the U-shaped seat. A cover plate is fitted on the outer wall of the positioning rod. An electric telescopic push rod is fixedly connected to the lower end of the top plate of the U-shaped seat between the positioning rods. A through hole is opened on the cover plate corresponding to the electric telescopic push rod. The lower end of the electric telescopic push rod extends into the through hole, and a calibration stop is fixedly connected to the bottom of the electric telescopic push rod in the through hole.

2. The quick positioning fixture for sheet metal processing as described in claim 1, characterized in that: The fixing posts are evenly spaced on the outer wall of the circumferential arc surface of three-quarters of the positioning box, and the positioning box is fixed to the middle edge of the lower end of the bottom plate of the U-shaped plate away from the hydraulic push rod by the fixing posts.

3. The quick positioning fixture for sheet metal processing as described in claim 2, characterized in that: When the top of the rotating plate is attached to the bottom surface of the lower base plate of the U-shaped plate, and the movable hanging column is located at the end of the limiting hole away from the hydraulic push rod, the rotating plate is perpendicular to the movable hanging column. At this time, the spring remains in a normally relaxed state.

4. The quick positioning fixture for sheet metal processing as described in claim 3, characterized in that: The spring is kept in a normal relaxed state. The clamping plate is located on one side of the U-shaped plate, and the top surface of the clamping plate is set at a height higher than the top surface of the bottom plate of the U-shaped plate. The clamping plate is fixedly connected to downward inclined side plates on both sides.

5. A quick positioning fixture for sheet metal processing as described in claim 1, characterized in that: The clamping plate is equipped with rollers that are evenly spaced and movably fitted on its top. The clamping plate has a hollow cavity inside the rollers. A worm is fixedly connected to the outer wall of one side of the roller and extends through into the hollow cavity. A worm wheel is rotatably installed inside the hollow cavity. The worm wheel meshes with the worm and has a threaded hole in the middle. A guide channel is opened on the top of the clamping plate at the corresponding threaded hole. A positioning screw is movably fitted in the threaded hole and the top of the positioning screw is movably engaged in the guide channel.

6. The quick positioning fixture for sheet metal processing as described in claim 1, characterized in that: An annular groove is provided on the outer wall of the middle part of the extrusion roller. Two sets of identical elastic components are fixedly connected side by side on the inner wall of the side plate between the upper and lower bottom plates of the U-shaped plate. An arc plate is fixedly connected to the end of the elastic component. The arc plate is movably engaged with the arc-shaped outer wall of the upper and lower sides of the annular groove on the extrusion roller.

7. A quick positioning fixture for sheet metal processing as described in claim 6, characterized in that: The pusher wheel at the annular groove has evenly spaced installation cavities inside. The inner wall of the installation cavity away from the annular groove has a sliding groove. The inner walls at the upper and lower ends of the installation cavity adjacent to the sliding groove are respectively fixedly connected to a return spring. The ends of the return springs are respectively fixedly connected to a movable clamping plate. The movable clamping plates are movably engaged in the sliding groove. The side wall of the installation cavity adjacent to the annular groove has a limiting groove corresponding to the movable clamping plate. The other end of the movable clamping plate is movably engaged in the limiting groove and then extends into the annular groove.

8. A quick positioning fixture for sheet metal processing as described in claim 7, characterized in that: A movable groove is formed at the top center of the movable clamping plate, extending downwards. A U-shaped rod is movably engaged within the movable groove on the movable clamping plate inside the annular inner groove. The upper and lower supports of the U-shaped rod movably penetrate the sidewall of the mounting cavity outside the limiting groove, and the ends of the upper and lower supports of the U-shaped rod extend into the mounting cavity. A movable plate is fixedly connected to the end of the U-shaped rod support in the mounting cavity. The movable plate is movably engaged within the movable groove, and its upper and lower ends are respectively attached to the inner walls of the upper and lower ends of the mounting cavity. A cable bundle is fixedly connected to the inner wall of the mounting cavity between the limiting grooves. Traction ropes are fixedly connected to the movable clamping plates on the upper and lower sides of the cable bundle. The traction ropes pass through the upper and lower sidewalls of the cable bundle and emerge from the end port of the cable bundle. The end of the traction rope emerges from the end port of the cable bundle and is fixedly connected to the sidewall of the movable plate.

9. A quick positioning fixture for sheet metal processing as described in claim 1, characterized in that: The hydraulic push rod includes a fixed base fixedly connected to the bottom of the mounting plate and a hydraulic cylinder fixedly connected to the bottom of the fixed base. A hydraulic telescopic rod is fixedly connected to the output end of the hydraulic cylinder, and a reinforcing plate is fixedly connected to the end of the hydraulic telescopic rod. The end of the reinforcing plate is fixedly connected to an auxiliary component. A U-shaped protective cover is fixedly connected to the bottom of the mounting plate outside the hydraulic cylinder.

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