Automobile longitudinal beam welding tool

Abstract

The utility model relates to the field of welding tools, and discloses an automobile longitudinal beam welding tool which comprises a rectangular bracket, a central positioning pin is arranged at the top of the center of the bracket, a tray is fixed to the bottom of the middle section of the bracket, four clamping pins are evenly distributed at the bottom of the tray, and longitudinal pin sleeves and transverse pin sleeves are alternately distributed among the four clamping pins. End positioning seats are fixed to the tops of the two ends of the bracket, end pressing pieces used for pressing the ends of the longitudinal beam are arranged on the end positioning seats, a middle positioning seat is fixed to the position, between the end positioning seats and the tray, of the top of the bracket, a middle positioning piece and a middle pressing piece are arranged on the middle positioning seat, and the middle positioning piece is used for positioning the middle of the longitudinal beam. A bottom supporting block is fixed to the position, between the middle positioning base and the center of the tray, of the top of the bracket, and an upper pressing plate used for pressing the longitudinal beam is arranged on the position, on the outer side of the bottom supporting block, of the bracket. The automobile longitudinal beam clamping device can stably and reliably clamp an automobile longitudinal beam and can be used in cooperation with a welding robot.

Description

Technical Field

[0001] This utility model relates to the field of welding fixtures, specifically to a welding fixture for automotive longitudinal beams. Background Technology

[0002] The longitudinal beam of an automobile is one of the main supporting structures of the chassis. It typically consists of two longitudinal beams and several cross beams, supported on the wheels by the suspension system, front axle, and rear axle. Automotive longitudinal beams are usually assembled by welding several sheet metal plates. Traditionally, welding involves using tooling to position and clamp the sheet metal, followed by manual welding by workers. This method usually requires a pre-fabricated welding fixture for a specific type of longitudinal beam. This fixture is fixed in a station to ensure positioning accuracy and is used consistently in the welding production of that type of longitudinal beam, ensuring the product's processing precision meets expectations. If other longitudinal beams with different structures need to be manufactured, corresponding welding fixtures need to be fabricated separately at other stations. With technological advancements, more and more factories are using welding robots for welding. Welding robots can perform stable and reliable welding over long periods, producing consistent and uniform weld quality, offering significant advantages over manual operation. Welding robots primarily work by mounting a robotic arm on the outside of the welding fixture; the robotic arm's movements complete the welding operation. Welding robots can be programmed to weld longitudinal beams of different structures. However, the welding fixtures used for clamping still need to be manufactured and fixed according to different longitudinal beams. Different products still need to be produced by setting up different welding fixtures in multiple locations and matching them with welding robots to form a welding production line. In reality, most of the time, the products produced are of the same model, while different products need to be produced after a period of time. If multiple welding production lines are set up, there will be a lot of cost investment and waste. If the welding fixtures can be quickly changed on the same production line, the cost can be effectively reduced. However, the current welding fixtures do not have the function of quick change and cannot be used with welding robots to quickly change fixtures on the same production line to meet the welding processing needs of different longitudinal beam products. Utility Model Content

[0003] The present invention aims to provide a welding fixture for automotive longitudinal beams, so as to achieve stable and reliable clamping of automotive longitudinal beams and to be used in conjunction with a welding robot.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a welding fixture for automotive longitudinal beams, comprising a rectangular bracket, a central positioning pin at the top center of the bracket, a tray concentric with the central positioning pin fixed at the bottom center section of the bracket, four clamping pins evenly distributed in a ring at the bottom of the tray, and longitudinal and transverse pin sleeves alternately distributed among the four clamping pins; end positioning seats fixed at the top of both ends of the bracket, end positioning seats having end clamping components for pressing the ends of the longitudinal beam, a central positioning seat fixed at the top of the bracket between the end positioning seats and the tray, a central positioning component and a central clamping component on the central positioning seat, the central positioning component for positioning the middle of the longitudinal beam, and the central clamping component for pressing the middle of the longitudinal beam; a bottom support block fixed at the top of the bracket between the central positioning seat and the center of the tray, and an upper pressure plate for pressing the longitudinal beam on the bracket outside the bottom support block.

[0005] Preferably, as an improvement, the end clamping member includes an end support block and an end pressure plate fixed to the top of the end positioning seat.

[0006] Preferably, as an improvement, the central positioning seat is provided with two parallel columns, and an upper pressure rod is provided between the top ends of the columns. Both ends of the upper pressure rod are connected to the top ends of the columns by pins. One of the columns is threaded with a horizontal screw rod, and the end of the screw rod is provided with a side push block located below the upper pressure rod. The middle of the upper pressure rod is threaded with a vertical screw rod, and the end of the screw rod is provided with an upper push block located between the columns. The side push block is used to press the longitudinal beam laterally, and the upper push block is used to press the longitudinal beam vertically.

[0007] Preferably, as an improvement, the top of the central positioning seat between the two columns is provided with multiple support pads arranged in a ring.

[0008] Preferably, as an improvement, a side support pad is provided on the outer side of the support pad, which is directly opposite to the side push block.

[0009] Preferably, as an improvement, a support foot is fixed to the bottom of the bracket below the central positioning seat, and the support foot is a strip that spans the bracket.

[0010] Preferably, as an improvement, the two ends of the support foot extend to the outside of the bracket, and a reinforcing rib plate is fixed between the side wall of the bracket and the support foot, and the reinforcing rib plate is provided with a lifting hole.

[0011] The welding fixture for the automotive longitudinal beams in this design uses a rectangular bracket as the main support structure for the longitudinal beams, matching their length. The bracket is supported by feet at the bottom for stable placement on the ground. A central locating pin on the bracket aligns with the locating hole in the middle of the longitudinal beam for centering and positioning. Bottom support blocks support the bottom of the longitudinal beam, and upper pressure plates on both sides press against the pre-installed extension plates at the side ends of the longitudinal beam, achieving positioning and clamping of the middle section. On the middle locating seat, first remove the pin from one section of the upper pressure rod, rotate the upper pressure rod to place the longitudinal beam between the two columns, then rotate the upper pressure rod back and fix it with the pin. Adjust the position of the longitudinal beam on the middle locating seat, supporting it with support pads and side support pads. Adjusting screws push the upper and side push blocks to vertically and laterally clamp the longitudinal beam. End support blocks on the end locating seats support the ends of the longitudinal beam and are clamped and fixed with end pressure plates. This allows for stable and reliable clamping of the automotive longitudinal beams for welding operations.

[0012] In the prior art, welding robots include a robotic arm and a workpiece clamping base. The workpiece clamping base is equipped with a quick-change connector. The quick-change connector includes a positioning clamping hole that matches the clamping pin, a longitudinal pin that matches the longitudinal pin sleeve, and a transverse pin that matches the transverse pin sleeve. It can be driven manually, mechanically, electrically, electromagnetically, or pneumatically. These are prior art technologies and will not be described in detail.

[0013] By placing a tray at the bottom center of the bracket, with clamping pins, longitudinal pin sleeves, and transverse pin sleeves on the tray as a positioning and connecting structure, the entire fixture is lifted onto the workpiece clamping base via the reinforcing ribs between the support legs and the bracket, and the lifting holes on them. The clamping pins, longitudinal pin sleeves, and transverse pin sleeves on the tray are aligned with the holes on the quick-change connector and inserted, allowing the tray to fit snugly against the end face of the quick-change connector for support. This, combined with the robotic arm, enables welding operations on automotive longitudinal beams, making welding more efficient. Furthermore, the quick-change mechanism between the fixture and the workpiece clamping base allows for the clamping of fixtures of different specifications, enabling the welding robot to perform welding operations on different automotive longitudinal beams.

[0014] A motor that drives the quick-change connector to rotate can also be installed on the workpiece clamping base, so that the tooling and the clamped automotive longitudinal beam can be rotated to cooperate with the robotic arm to complete the welding operation of different parts of the automotive longitudinal beam. The concentric setting of the pallet, center positioning pin and clamping pin ensures that the tooling and automotive longitudinal beam remain stable during the rotation process. Attached Figure Description

[0015] Figure 1 This is an axonometric view of an embodiment of the present invention after the automobile longitudinal beam has been clamped.

[0016] Figure 2 This is a top view of an embodiment of the present invention after the automobile longitudinal beam has been clamped.

[0017] Figure 3 This is a bottom view of an embodiment of the present invention after the automobile longitudinal beam has been clamped.

[0018] Figure 4 This is a side view of an embodiment of the present invention after the automobile longitudinal beam has been clamped. Detailed Implementation

[0019] The following detailed description illustrates the specific implementation method:

[0020] The reference numerals in the accompanying drawings include: bracket 1, tray 2, end positioning seat 3, middle positioning seat 4, end pressure plate 5, end support block 6, support pad 7, reinforcing rib 8, adjusting bolt 9, column 10, lifting hole 11, support foot 12, side push block 13, upper push block 14, upper pressure rod 15, bottom support block 16, longitudinal beam 17, upper pressure plate 18, center positioning pin 19, clamping pin 20, longitudinal pin sleeve 21, transverse pin sleeve 22, and side support pad 23.

[0021] The basic implementation examples are as follows: Figure 1 As shown: A welding fixture for automotive longitudinal beams includes a rectangular bracket 1, which is composed of four square steel bars welded together. A support plate is welded to the center of the bracket 1. Figure 2 As shown, a central positioning pin 19 is bolted to the top of the support plate, and a tray 2, concentric with the central positioning pin 19, is welded and fixed to the bottom of the middle section of the bracket 1. Figure 3 , Figure 4 As shown, four clamping pins 20 are riveted to the bottom of the tray 2. The four clamping pins 20 are evenly distributed in a ring around the center of the tray 2. In this embodiment, all four clamping pins 20 are SPC40-16 type SCHUNK pins. Longitudinal pin sleeves 21 and transverse pin sleeves 22 are alternately distributed among the four clamping pins 20. The longitudinal pin sleeves 21 and transverse pin sleeves 22 are connected to the tray 2 by screws. The pin hole of the longitudinal pin sleeve 21 is a vertical hole with the opening facing downwards, and the pin hole axis of the transverse pin sleeve 22 is parallel to the length direction of the bracket 1.

[0022] The bracket 1 has end positioning seats 3 bolted to the top of both ends. The end positioning seats 3 are provided with end clamping members for pressing the ends of the longitudinal beam 17. The end clamping members include end support blocks 6 and end pressure plates 5 fixed to the top of the end positioning seats 3. The end support blocks 6 are fixed by bolts.

[0023] A central positioning seat 4 is bolted to the top of the bracket 1 between the end positioning seat 3 and the tray 2. The central positioning seat 4 is equipped with a central positioning component and a central clamping component. The central positioning component is used to position the middle part of the longitudinal beam 17, and the central clamping component is used to clamp the middle part of the longitudinal beam 17. Two parallel columns 10 are bolted to the central positioning seat 4. An upper pressure rod 15 is provided between the top ends of the columns 10. Both ends of the upper pressure rod 15 are connected to the top ends of the columns 10 through pins. The columns 10 and the upper pressure rod 15 are the central positioning components. One of the columns 10 is threaded with a horizontal screw rod. A side push block 13, located below the upper pressure rod 15, is welded to the end of the screw rod. A vertical screw rod is threaded to the middle of the upper pressure rod 15. An upper push block 14, located between the columns 10, is welded to the end of the screw rod. Four ring-shaped support pads 7 are screwed to the top of the central positioning seat 4 between the two columns 10. Side support pads 23, opposite the side push blocks 13, are provided on the outer side of the support pads 7 and screwed onto the central positioning seat 4. The side push blocks 13 and side support pads 23 cooperate to laterally press the longitudinal beam 17, while the upper push block 14 and support pads 7 cooperate to vertically press the longitudinal beam 17.

[0024] A bottom support block 16 is welded and fixed to the top of the bracket 1 between the center positioning seat 4 and the center of the tray 2. An upper pressure plate 18 for pressing the longitudinal beam 17 is provided on the bracket 1 outside the bottom support block 16. The upper pressure plate 18 is a strip plate with one end as the pressing end and the other end as the adjusting end. The adjusting end has a threaded hole and is connected to an adjusting bolt 9. The upper pressure plate 18 has a strip hole in the middle. The structure of the end pressure plate 5 is the same as that of the upper pressure plate 18. Vertical support screws are welded to the bracket 1 and the end positioning seat 3. The strip hole in the middle of the upper pressure plate 18 and the end pressure plate 5 is fitted onto the support screws, and nuts are connected to the support screws. The upper pressure plate 18 and the end pressure plate 5 can be adjusted by turning the adjusting bolt 9 to press the automobile longitudinal beam 17.

[0025] A support leg 12 is welded and fixed to the bottom of the bracket 1 below the central positioning seat 4. The support leg 12 is a strip square steel tube that spans the bracket 1. Both ends of the support leg 12 extend to the outside of the bracket 1. A reinforcing rib plate 8 is welded and fixed between the side wall of the bracket 1 and the support leg 12. The reinforcing rib plate 8 has a lifting hole 11.

[0026] The specific implementation process is as follows: When the tooling is ready for use, it is placed on the ground or on the rack via the support foot 12. When clamping the automotive longitudinal beam 17, remove the pin at one end of the upper pressure rod 15, rotate to open the upper pressure rod 15, and then transport the semi-finished longitudinal beam 17 onto the bracket 1. The through hole in the middle of the longitudinal beam 17 is aligned with the center positioning pin 19 for centering. The bottom support block 16, support pad 7, and end support block 6 provide bottom support for the longitudinal beam 17. After adjusting the position of the longitudinal beam 17, the upper pressure plate 18, end pressure plate 5, upper push block 14, side push block 13, and side support pad 23 are used to press and position the longitudinal beam 17, thus completing the clamping of the longitudinal beam 17. Then, the tooling and longitudinal beam 17 are hoisted together to the welding station of the welding robot through the hoisting holes 11 on the reinforcing rib plate 8. The tooling is then hoisted onto the workpiece clamping base, keeping the clamping pin 20, longitudinal pin sleeve 21, and transverse pin sleeve 22 aligned with the pins and holes of the quick-change connector on the workpiece clamping base. After being lowered, the clamping pin 20 is inserted into the pin hole of the quick-change connector and clamped by the spring collet in the pin hole. The vertical pin on the quick-change connector is inserted into the longitudinal pin sleeve 21, and the transverse pin sleeve 22 is aligned with the pin hole on the quick-change connector and then inserted into the connecting pin. This connects the tray 2 to the quick-change connector, thus facilitating the welding robot to perform welding operations.

[0027] The welding fixture for automotive longitudinal beam 17 of this utility model can stably, reliably and accurately position and clamp the automotive longitudinal beam 17, and can be used in conjunction with a welding robot for rapid installation and welding operation, thereby improving the welding processing efficiency of automotive longitudinal beam 17.

[0028] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A welding fixture for automotive longitudinal beams, characterized in that: The device includes a rectangular bracket with a central locating pin at the top center. A tray concentric with the central locating pin is fixed to the bottom of the middle section of the bracket. Four clamping pins are evenly distributed in a ring at the bottom of the tray, with longitudinal and transverse pin sleeves alternating between the four clamping pins. End locating seats are fixed to the top of both ends of the bracket, and end clamping components are provided on the end locating seats for pressing the ends of the longitudinal beams. A middle locating seat is fixed to the top of the bracket between the end locating seats and the tray. The middle locating seat is provided with a middle locating component and a middle clamping component. The middle locating component is used to position the middle of the longitudinal beam, and the middle clamping component is used to press the middle of the longitudinal beam. A bottom support block is fixed to the top of the bracket between the middle locating seat and the center of the tray. An upper pressure plate for pressing the longitudinal beam is provided on the bracket outside the bottom support block.

2. The welding fixture for automotive longitudinal beams according to claim 1, characterized in that: The end clamping component includes an end support block and an end pressure plate fixed to the top of the end positioning seat.

3. The welding fixture for automotive longitudinal beams according to claim 2, characterized in that: The central positioning seat has two parallel columns, with an upper pressure rod between the tops of the columns. Both ends of the upper pressure rod are connected to the tops of the columns via pins. One of the columns is threaded with a horizontal screw, and the end of the screw is provided with a side push block located below the upper pressure rod. The middle of the upper pressure rod is threaded with a vertical screw, and the end of the screw is provided with an upper push block located between the columns. The side push block is used to press the longitudinal beam laterally, and the upper push block is used to press the longitudinal beam vertically.

4. The welding fixture for automotive longitudinal beams according to claim 3, characterized in that: The top of the central positioning seat between the two columns is equipped with multiple support pads arranged in a ring.

5. The welding fixture for automotive longitudinal beams according to claim 4, characterized in that: A side support pad is provided on the outside of the support pad, which is directly opposite the side push block.

6. The welding fixture for automotive longitudinal beams according to claim 5, characterized in that: The bottom of the bracket below the central positioning seat is fixed with a support foot, which is a strip that spans the bracket.

7. The welding fixture for automotive longitudinal beams according to claim 6, characterized in that: The two ends of the support legs extend to the outside of the bracket, and a reinforcing rib plate is fixed between the side wall of the bracket and the support legs. The reinforcing rib plate has a lifting hole.

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