Four-bar linkage clamping device for automobile welding assembly hoist

Abstract

The utility model discloses a four connecting rod clamping device for automobile welding lifting appliance, specifically relates to the field of automobile welding technology, including support plate, a plurality of fixed connection support plate on the guide rod, fixed connection top plate on the guide rod, fixed connection first electric push rod on the top plate, fixed connection sliding plate on the output end of first electric push rod, fixed connection cross bar on the sliding plate, two first connecting rod one end fixed connection cross bar both ends, second connecting rod one end rotatory connection first connecting rod other end, third connecting rod one end rotatory connection second connecting rod other end and rotatory connection sliding block in third connecting rod other end, and the support plate bottom is fixedly connected with the guide rail, and the guide rail and sliding block are slidably connected, and the sliding plate and guide rod are slidably connected. The utility model discloses through the quick connector of pneumatic drive's quick connector seat, has realized the " one -key type " quick replacement of clamp, has greatly promoted the equipment utilization and production efficiency, has guaranteed the stability of clamp under heavy load and vibration simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of automotive welding technology, and more specifically, to a four-bar clamping device for automotive welding lifting fixtures. Background Technology

[0002] The clamping device of an automotive welding jig is a key component used to fix the welded workpiece. It mainly consists of a power source, an intermediate force transmission mechanism, and clamping elements. Its core function is to use precise clamping force to stably fix the workpiece on the jig, preventing displacement caused by thermal deformation or external forces during the welding process, thereby ensuring welding accuracy and quality.

[0003] In traditional automotive welding jigs, the mechanical connection between the jig and the drive unit is generally outdated. It typically involves direct bolt fastening or simple manual pin insertion for quick replacement. When the production line needs to change jigs due to product model changes, operators must use wrenches and other tools to tighten and loosen bolts one by one, or laboriously align and insert pins. The entire process is cumbersome and labor-intensive, significantly extending the downtime for equipment due to mold changes. This severely restricts the high-paced, fast-response rhythm of modern production. Furthermore, the installation quality and reliability are directly dependent on the operator. Minor deviations in installation positioning, inconsistent tightening torque, or forgetting to tighten critical bolts are easily overlooked, creating quality hazards and safety risks for subsequent production processes, directly affecting the positioning accuracy and production stability of the welding station.

[0004] In summary, to improve installation efficiency, quality, and reliability, it is necessary to address the outdated connection method between the clamping device and the drive unit in traditional automotive welding jigs, which leads to time-consuming and labor-intensive clamp replacements, and to enable quick and precise clamp switching. Utility Model Content

[0005] The present invention provides a four-bar clamping device for automotive welding lifting fixtures, which aims to solve the problem that the traditional clamping device for automotive welding lifting fixtures has an outdated connection method between the clamp and the drive unit, resulting in time-consuming and labor-intensive clamp replacement.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a four-bar clamping device for automotive welding lifting fixtures, comprising a support plate, several guide rods fixedly connected to the support plate, a top plate fixedly connected to the guide rods, a first electric push rod fixedly connected to the top plate, a slide plate fixedly connected to the output end of the first electric push rod, a crossbar fixedly connected to the slide plate, two first connecting rods with one end fixedly connected to the two ends of the crossbar, a second connecting rod with one end rotatably connected to the other end of the first connecting rod, a third connecting rod with one end rotatably connected to the other end of the second connecting rod, and a slider rotatably connected to the other end of the third connecting rod. A guide rail is fixedly connected to the bottom of the support plate, the guide rail and the slider are slidably connected, the slide plate and the guide rod are slidably connected, the first electric push rod is used to drive the slide plate to move along the guide rod, and two symmetrical quick-connect seats are fixedly connected to the bottom of the slider. Quick-connect joints are movably connected to the quick-connect seats, and clamps are fixedly connected to the quick-connect joints.

[0007] In a preferred embodiment, the support plate has two symmetrical adjustment slots, and a tightening nut is threaded onto the adjustment slot. A hinge plate is fixedly connected to the tightening nut, and the hinge plate is rotatably connected to the second link.

[0008] In a preferred embodiment, the quick-connector has two air holes, and an air supply pipe is fixedly connected between the two corresponding air holes on the two quick-connectors.

[0009] In a preferred embodiment, a fixed connecting ring is fixedly connected to the bottom of the quick-connect seat, and a number of locking steel balls are movably connected to the fixed connecting ring.

[0010] In a preferred embodiment, a piston is slidably connected inside the quick-connect seat, a transmission rod is fixedly connected to the bottom of the piston, a conical head is fixedly connected to the bottom of the transmission rod, and the conical head and a locking steel ball are movably connected.

[0011] In a preferred embodiment, the slider has a movable cavity, and a convex block is movably connected within the movable cavity.

[0012] In a preferred embodiment, a second electric push rod is fixedly connected to the convex block, and an I-shaped block is fixedly connected to the output end of the second electric push rod. The I-shaped block and the slider are slidably connected. The second electric push rod is used to drive the I-shaped block to move along a preset direction. A limit post is fixedly connected to the bottom of the I-shaped block.

[0013] In a preferred embodiment, a connecting frame is fixedly connected between the limiting post and the convex block, the connecting frame is slidably connected to the slider, and two symmetrical locking blocks are movably connected between the I-shaped block and the convex block, the locking blocks are rotatably connected to the slider.

[0014] The beneficial effects of this utility model are as follows: 1. This utility model enables "one-click" quick change of fixtures through pneumatically driven quick-connect seats and quick-connect couplings, reducing changeover time from hours to minutes or even seconds, greatly improving equipment utilization and production efficiency, while ensuring the stability of fixtures under heavy loads and vibrations.

[0015] 2. This utility model integrates a lever-type locking system inside the slider, driven by a second electric push rod and composed of I-shaped blocks and locking blocks, to rigidly lock the slider to the guide rail and support structure, completely eliminating any slight displacement that may be caused by welding vibration. This provides an extremely stable benchmark for high-precision welding processes, directly improving welding quality and vehicle body dimensional accuracy. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the hinge plate structure of this utility model.

[0018] Figure 3 This is a schematic diagram of the guide rail structure of this utility model.

[0019] Figure 4 This is a schematic diagram of the slider structure of this utility model.

[0020] Figure 5 This is a schematic diagram of the locking block structure of this utility model.

[0021] Figure 6 This is a schematic diagram of the quick-connector structure of this utility model.

[0022] The attached figures are labeled as follows: 1. Support plate; 101. Adjustment groove; 2. Guide rod; 3. Top plate; 4. First electric push rod; 5. Slide plate; 6. Crossbar; 7. First connecting rod; 8. Second connecting rod; 9. Third connecting rod; 10. Slider; 1001. Movable cavity; 11. Guide rail; 12. Tightening nut; 13. Hinge plate; 14. Quick connector; 1401. Air hole; 15. Quick connector; 16. Clamp; 17. Air pipe; 18. Piston; 19. Transmission rod; 20. Conical head; 21. Fixed connecting ring; 22. Locking steel ball; 23. Convex block; 24. Second electric push rod; 25. I-shaped block; 26. Limiting post; 27. Connecting frame; 28. Locking block. Detailed Implementation

[0023] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0024] Refer to the instruction manual appendix Figures 1 to 6 A four-bar clamping device for automotive welding lifting fixtures includes a support plate 1, several guide rods 2 fixedly connected to the support plate 1, a top plate 3 fixedly connected to the guide rods 2, a first electric push rod 4 fixedly connected to the top plate 3, a slide plate 5 fixedly connected to the output end of the first electric push rod 4, a crossbar 6 fixedly connected to the slide plate 5, two first connecting rods 7 with one end fixedly connected to the two ends of the crossbar 6 respectively, a second connecting rod 8 with one end rotatably connected to the other end of the first connecting rod 7, a third connecting rod 9 with one end rotatably connected to the other end of the second connecting rod 8, and a slider 10 rotatably connected to the other end of the third connecting rod 9. A guide rail 11 is fixedly connected to the bottom of the support plate 1, the guide rail 11 and the slider 10 are slidably connected, the slide plate 5 and the guide rods 2 are slidably connected, the first electric push rod 4 is used to drive the slide plate 5 to move along the guide rods 2, and two symmetrical quick-connect seats 14 are fixedly connected to the bottom of the slider 10. A quick connector 15 is movably connected to the quick connector 14, and a clamp 16 is fixedly connected to the quick connector 15.

[0025] It should be noted that the first electric push rod 4, as the core power source, provides initial and controllable linear motion through its extension and retraction, enabling the slide plate 5 to move linearly along the guide rod 2. The slide plate 5 has several smooth through holes, the number of which is symmetrical to the number of guide rods 2, and their sizes are matched to ensure that the slide plate 5 performs strictly vertical and wobbly linear motion under the drive of the first electric push rod 4. The first electric push rod 4 in this device is a Thomson model. The guide rail 11 is composed of two wedge blocks, and its size is matched to the slider 10, strictly limiting the displacement of the slider 10 and providing support force.

[0026] It is worth noting that the crossbar 6, first link 7, second link 8, third link 9, support plate 1, and guide rail 11 together form an ingenious motion conversion system. The crossbar 6 is fixed to the slide plate 5 and moves up and down with it. The upper end of the first link 7 is hinged to the crossbar 6, and the lower end is hinged to the second link 8, which plays the role of transmitting motion and force. The second link 8 is the key transmission link, which transmits the motion of the first link 7 to the third link 9. The third link 9 acts as an "output rocker", which drives the slider 10 to move. When the plate 5 moves downward under the drive of the electric push rod, the crossbar 6 pulls the first connecting rod 7, which in turn drives the second connecting rod 8 to move, forcing the third connecting rod 9 to rotate around its hinge point with the slider 10. This rotation is decomposed into a horizontal component force, which pushes the slider 10 to move horizontally along the guide rail 11 towards the center (i.e., the direction in which the two sliders 10 approach each other), thus achieving the clamping action. Conversely, when the plate 5 moves upward, the entire linkage mechanism moves in the opposite direction, driving the two sliders 10 to separate to both sides along the guide rail 11, thus achieving the releasing action.

[0027] Refer to the instruction manual appendix Figure 2The support plate 1 has two symmetrical adjustment slots 101. A tightening nut 12 is threaded onto the adjustment slot 101. A hinge plate 13 is fixedly connected to the tightening nut 12. The hinge plate 13 is rotatably connected to the second connecting rod 8.

[0028] It should be noted that the adjustment groove 101 is an elongated through hole opened on the support plate 1. The tightening nut 12 is a T-shaped nut, the shape of which allows it to be inserted from one side of the adjustment groove 101 and slide in the groove. When tightened, it can be firmly locked on both sides of the groove wall. When adjustment is required, the tightening nut 12 is loosened, so that the hinge plate 13 can slide freely along the long axis of the adjustment groove 101 to make fine adjustments to the hinge position. This ensures that when the mechanism is fully clamped, it can accurately reach or pass the "dead point" position, thereby making full use of the self-locking characteristics of the four-bar linkage and making the clamping safer and more reliable.

[0029] Refer to the instruction manual appendix Figure 6 Two air holes 1401 are provided on the quick-connect bracket 14, and an air supply pipe 17 is fixedly connected between the two corresponding air holes 1401 on the two quick-connect brackets 14.

[0030] It should be noted that the air hole 1401 is a precision through hole opened on the quick-connect seat 14. One is located on the top side of the quick-connect seat 14 as a medium inlet, and the other is located on the bottom side of the quick-connect seat 14 as an outlet. At the same time, it is connected between the corresponding air holes 1401 of the two symmetrical quick-connect seats 14 through the air supply pipe 17, ensuring that the pressure medium (compressed air) can be delivered to the quick-connect mechanism on both sides simultaneously, in equal amounts and synchronously.

[0031] Refer to the instruction manual appendix Figure 6 The bottom of the quick-connect bracket 14 is fixedly connected to a fixed ring 21, and several locking steel balls 22 are movably connected to the fixed ring 21.

[0032] It should be noted that the fixed ring 21 is an annular component fixed to the bottom of the quick connector 14. It is made of high-strength steel and has multiple annular grooves machined on its inner side. Several locking steel balls 22 are evenly placed in the annular grooves on the inner side of the fixed ring 21. The locking steel balls 22 are parts that directly contact the quick connector 15 and apply locking force.

[0033] Refer to the instruction manual appendix Figure 6 A piston 18 is slidably connected inside the quick-connect seat 14. A transmission rod 19 is fixedly connected to the bottom of the piston 18. A conical head 20 is fixedly connected to the bottom of the transmission rod 19. The conical head 20 and the locking steel ball 22 are movably connected.

[0034] It should be noted that the piston 18 is a sliding component that precisely fits into the inner cavity of the quick connector 14, dividing the inner cavity of the quick connector 14 into upper and lower chambers. When air enters the upper chamber, the piston 18 moves downward, and when air enters the lower chamber, the piston 18 moves upward. The movement of the piston 18 is transmitted to the conical head 20 through the transmission rod 19. The unique inclined surface of the conical head 20 is used to squeeze the locking steel balls 22, causing them to partially protrude from the fixed connecting ring 21, thereby completing the locking of the quick connector 15.

[0035] Refer to the instruction manual appendix Figure 5 The slider 10 has a movable cavity 1001, and a convex block 23 is movably connected inside the movable cavity 1001.

[0036] It should be noted that the movable cavity 1001 is a cavity machined inside the slider 10, which provides space for the vertical movement of the convex block 23.

[0037] Refer to the instruction manual appendix Figure 5 A second electric push rod 24 is fixedly connected to the convex block 23. An I-shaped block 25 is fixedly connected to the output end of the second electric push rod 24. The I-shaped block 25 and the slider 10 are slidably connected. The second electric push rod 24 is used to drive the I-shaped block 25 to move along a preset direction. A limit post 26 is fixedly connected to the bottom of the I-shaped block 25.

[0038] It should be noted that the second electric push rod 24 serves as a power source, driving the I-shaped block 25 to perform strict up-and-down movements, and the movement is limited by the limiting post 26. The model of the second electric push rod 24 in this device is Thomson.

[0039] Refer to the instruction manual appendix Figure 5 A connecting frame 27 is fixedly connected between the limiting post 26 and the convex block 23. The connecting frame 27 is slidably connected to the slider 10. Two symmetrical locking blocks 28 are movably connected between the I-shaped block 25 and the convex block 23. The locking blocks 28 are rotatably connected to the slider 10.

[0040] It should be noted that the connecting frame 27 connects the limiting post 26 and the convex block 23 to ensure that the two are relatively fixed in the horizontal direction and maintain structural stability. The locking block 28 consists of two symmetrically arranged lever-type parts, which are rotatably connected to the slider 10 body through a rotating shaft in the middle, forming a lever mechanism.

[0041] It is worth noting that when the second electric push rod 24 drives the I-shaped block 25 to move downward, it will push the locking block 28 to move closer to one end of the I-shaped block 25. Since the middle of the locking block 28 is the fulcrum, according to the lever principle, its other end will open outward, applying greater pressure to the convex block 23, so that the convex block 23 is pressed tightly onto the guide rail 11. At the same time, due to the unique wedge shape of the guide rail 11, while applying pressure to the guide rail 11, the slider 10 connected to the guide rail 11 is also pressed, thereby achieving a firm lock of the entire slider 10.

[0042] Working principle: The first electric push rod 4 drives the slide plate 5 to move, causing the slide plate 5 to move downward along the guide rod 2. The crossbar 6 moves downward accordingly, causing the first connecting rod 7, which is hinged at both ends, to swing. The first connecting rod 7 transmits the motion and force to the second connecting rod 8, which is rotatably connected to it. The second connecting rod 8 then drives the third connecting rod 9 to rotate around its hinge point with the slider 10, thereby converting a vertical motion into a horizontal component force. Finally, it pushes the slider 10 to slide horizontally towards the center along the guide rail 11, realizing the clamping action. During this process, the rotation center of the second connecting rod 8 is provided by the hinge plate 13, which is fixed by the tightening nut 12 passing through the adjustment groove 101 on the support plate 1. By adjusting the position of this hinge point, the dead point of the mechanism and the clamping force can be optimized. In addition, to realize the quick switching and locking of the clamp 16, an external air pump is connected through two quick-connect seats 1. The air supply pipe 17 corresponding to the air hole 1401 on the 4th enters the inner cavity of the quick connector 14, pushing the piston 18 to move downward. The piston 18 drives the conical head 20 to press down through the transmission rod 19, forcing several locking steel balls 22 that are movably connected in the fixed connecting ring 21 to protrude radially outward, thereby locking the inserted quick connector 15. Finally, the workpiece is clamped by the clamp 16 fixed on the quick connector 15. To further enhance rigidity, the second electric push rod 24 drives the I-shaped block 25 to move along the preset direction. The I-shaped block 25 forms a stable motion frame through its limiting post 26 and connecting frame 27, and pushes two symmetrical locking blocks 28 to rotate around the fulcrum, so that its other end opens outward and presses the relevant parts, finally locking the entire slider 10 firmly on the guide rail 11 to cope with the high-intensity impact and vibration during the welding process.

[0043] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. A four-bar clamping device for automotive welding lifting fixtures, characterized in that: Includes a support plate (1), several guide rods (2) fixedly connected to the support plate (1), a top plate (3) fixedly connected to the guide rods (2), a first electric push rod (4) fixedly connected to the top plate (3), a slide plate (5) fixedly connected to the output end of the first electric push rod (4), a crossbar (6) fixedly connected to the slide plate (5), two first connecting rods (7) with one end fixedly connected to both ends of the crossbar (6), a second connecting rod (8) with one end rotatably connected to the other end of the first connecting rod (7), and another connecting rod (8) with one end rotatably connected to the other end of the second connecting rod (8). The third link (9) at one end and the slider (10) at the other end of the third link (9) are rotatably connected. The bottom of the support plate (1) is fixedly connected to the guide rail (11). The guide rail (11) and the slider (10) are slidably connected. The slide plate (5) and the guide rod (2) are slidably connected. The first electric push rod (4) is used to drive the slide plate (5) to move along the guide rod (2). The bottom of the slider (10) is fixedly connected to two symmetrical quick-connect seats (14). The quick-connect seats (14) are movably connected to quick connectors (15). The quick connectors (15) are fixedly connected to clamps (16).

2. The four-bar clamping device for automotive welding lifting fixtures according to claim 1, characterized in that: Two symmetrical adjustment slots (101) are provided on the support plate (1). A tightening nut (12) is threaded onto the adjustment slot (101). A hinge plate (13) is fixedly connected to the tightening nut (12). The hinge plate (13) is rotatably connected to the second connecting rod (8).

3. A four-bar clamping device for automotive welding lifting fixtures according to claim 1, characterized in that: Two air holes (1401) are provided on the quick connector (14), and an air supply pipe (17) is fixedly connected between the two corresponding air holes (1401) on the two quick connectors (14).

4. A four-bar clamping device for automotive welding lifting fixtures according to claim 1, characterized in that: The quick connector (14) has a fixed connecting ring (21) at the bottom, and several locking steel balls (22) are movably connected on the fixed connecting ring (21).

5. A four-bar clamping device for automotive welding lifting fixtures according to claim 4, characterized in that: A piston (18) is slidably connected inside the quick-connect seat (14). A transmission rod (19) is fixedly connected to the bottom of the piston (18). A conical head (20) is fixedly connected to the bottom of the transmission rod (19). The conical head (20) and the locking steel ball (22) are movably connected.

6. A four-bar clamping device for automotive welding lifting fixtures according to claim 1, characterized in that: The slider (10) has a movable cavity (1001) inside, and a convex block (23) is movably connected inside the movable cavity (1001).

7. A four-bar clamping device for automotive welding lifting fixtures according to claim 6, characterized in that: A second electric push rod (24) is fixedly connected to the convex block (23). An I-shaped block (25) is fixedly connected to the output end of the second electric push rod (24). The I-shaped block (25) and the slider (10) are slidably connected. The second electric push rod (24) is used to drive the I-shaped block (25) to move along a preset direction. A limit post (26) is fixedly connected to the bottom of the I-shaped block (25).

8. A four-bar clamping device for automotive welding lifting fixtures according to claim 7, characterized in that: A connecting frame (27) is fixedly connected between the limiting post (26) and the convex block (23). The connecting frame (27) and the slider (10) are slidably connected. Two symmetrical locking blocks (28) are movably connected between the I-shaped block (25) and the convex block (23). The locking blocks (28) and the slider (10) are rotatably connected.

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