Double-body assembling and welding fixture for double-section tracked vehicle

Abstract

The double-vehicle-body positive assembly welding fixture for double-section tracked vehicles belongs to the technical field of positive assembly welding of armored vehicle bodies, is a welding fixture for controlling welding precision of each walking unit, mainly comprises a fixture platform (1), an inducing unit positioning support (2), a balance bar positioning support (3), a side transmission body positioning support (4), a transfer case cover positioning support (5) and the like, and each positioning support is positioned on the fixture platform according to product required dimensions to form a set of vehicle body walking system positioning assembly fixture, and product walking components are assembled on each positioning support to control mutual position precision, and the fixture has the advantages that: in the welding process, the rigid limiting effect of the fixture satisfies the dimension precision after vehicle body welding, the welding precision is ensured, and meanwhile, the operability and stability are improved, accurate and effective positioning is provided for each walking unit, and welding deformation is overcome through overall welding.

Description

Technical Field

[0001] This invention belongs to the field of welding fixture technology. It is a welding jig for controlling the welding accuracy of each walking unit. It relates to a welding positioning suitable for the positive assembly of two tracked vehicles, and more particularly to a welding jig for the positive assembly of two tracked vehicles. Background Technology

[0002] The vehicle body walking system working unit of a certain tracked vehicle model is an important component of the whole vehicle. Each walking working unit is connected to the vehicle body by welding. The side drive, stabilizer bar, idler wheel and transfer case sleeve all have requirements for the three dimensions of horizontal, longitudinal and vertical space. Moreover, each part requires high welding precision. Therefore, the positional accuracy between each unit during the product welding process has a significant impact on the subsequent overall assembly and the quality of the whole vehicle. After welding with the existing method, it is difficult to remove the jig from the vehicle body due to the welding stress. In addition, there are no clamping and positioning points to prevent the phenomenon of vehicle "bow" after welding. Summary of the Invention

[0003] (I) Purpose of the Invention

[0004] The purpose of this invention is to improve the relative positional accuracy of the various walking units in existing vehicle models after welding, ensure that the tires can be easily removed after the vehicle body is welded to improve the convenience of operation, and at the same time provide reliable clamping and positioning points to overcome the "bow" phenomenon of the vehicle.

[0005] (II) Technical Solution

[0006] The vehicle body assembly welding fixture is characterized by comprising one fixture platform, two guide unit positioning brackets, ten balance bar positioning brackets, two side transmission positioning brackets, and one transfer case sleeve positioning bracket; the fixture platform has a fixture platform reference surface, which serves as the first reference positioning surface for subsequent structural assemblies, and the fixture platform is fastened to the base platform; the fixture platform has multiple T-slot anti-deformation structures distributed parallel at intervals, and the end of the fixture platform has a fixture platform positioning surface, which is a rectangular stop facing downward from the fixture platform reference surface, and the T-slot anti-deformation structure is a T-slot;

[0007] The side drive positioning bracket consists of a lower plate and an upper cover. The semi-circular arc of the lower plate and the upper cover is fastened to form a complete circular hole. The short shaft is clamped in the complete circular hole, and the inner side of the short shaft is connected to the fixed positioning plate. The line connecting the two side drive positioning brackets is arranged parallel to the T-slot and symmetrically located on the right edge of the reference plane of the fixture platform.

[0008] The guiding unit positioning bracket consists of a lower plate and an upper cover. The semi-circular arc of the lower plate and the upper cover is fastened to form a complete circular hole. The short shaft is clamped in the complete circular hole and extends inward parallel to the T-slot. The two guiding unit positioning brackets are symmetrical and the connecting line is parallel to the T-slot, located on the left edge of the reference plane of the fixture platform.

[0009] The balance bar positioning bracket consists of an outer plate, an inner plate, a positioning shaft, and fixing screws. The lower end face of the outer plate is fixedly connected to the reference surface of the fixture platform. The inner plate is detachably connected to the inside of the outer plate and has through holes for the fixing screws to pass through. At the same time, the fixing bolts pass through the threaded holes on the balance shaft of the product to be used to fix the balance shaft of the product. The positioning shaft is fixed to the inner plate and mates with the holes of the balance bar of the product to be used. Ten balance bar positioning brackets are symmetrically distributed on both sides of the reference surface of the fixture platform and are located between the side drive positioning bracket and the guide unit positioning bracket.

[0010] The transfer case sleeve positioning bracket is located at the far right end of the reference plane of the jig platform, with a sleeve extending forward. The sleeve is used to position the transfer case sleeve of the product.

[0011] Furthermore, the transfer case positioning bracket consists of a lower plate, an upper cover, and a base plate. The lower plate and the upper cover each have a semi-circular arc. The lower plate and the upper cover are fastened together with fixing bolts to form a complete circle. A sleeve of the same size as the complete circle is clamped in place. The lower plate is welded to the base plate in the center. The base plate is fastened to the positioning surface of the jig platform on the jig platform with fixing bolts.

[0012] Furthermore, the flatness of the reference surface of the fixture platform is no greater than 1.

[0013] Furthermore, the platform positioning point is located on the fixture platform and has a stepped hole structure.

[0014] Furthermore, the fixture platform is secured to the base platform using hexagonal socket head cap screws;

[0015] Furthermore, the jig platform has lifting points, which, together with eye bolts, allow the jig platform to be lifted and transported.

[0016] Furthermore, the inner and outer plates of the stabilizer bar positioning bracket are fastened together to form a single integral component.

[0017] Furthermore, the lower end of the inner plate of the stabilizer bar positioning bracket is higher than the lower end of the outer plate.

[0018] Furthermore, the positioning bracket of the transfer case is positioned on the positioning surface of the fixture platform.

[0019] The design incorporates a "sandwich" stabilizer bar positioning bracket. The outer layer ensures the spatial dimensional accuracy of each traveling unit, while the inner layer facilitates easy removal of the jig after the vehicle body is welded. This increases the freedom of movement when assembling the stabilizer bars by limiting the positioning mandrel, achieving dual positioning and improving the accuracy and stability of positioning. A "T-slot" structure base platform is also designed to provide a positioning fulcrum for welding and clamping, enabling clamping technology.

[0020] (III) Beneficial Effects

[0021] The product's moving parts are assembled onto each positioning bracket, and their relative positional accuracy is controlled. During the welding process, the rigidity of the jig restricts the dimensional accuracy of the vehicle body after welding. While ensuring welding accuracy, it also improves operability and stability, providing accurate and effective positioning for each moving unit. Through overall welding, welding deformation is overcome.

[0022] The beneficial effects of the "sandwich-type" dual positioning structure and platform clamping technology provided by the above technical solution are as follows:

[0023] (1) Improve the accuracy and stability of positioning, further improve the mutual positional accuracy of welding of the vehicle's walking system, and complete the product quality improvement.

[0024] (2) The operation process is convenient and the jig is easy to remove after the car body is welded. This significantly saves time and costs during mass production and directly improves production efficiency.

[0025] (3) The clamping positioning point solves the "bow" phenomenon that occurs after the vehicle body is welded, ensuring the overall size of the vehicle body while laying a good foundation for subsequent overall assembly, realizing process technology optimization, and thus improving the overall quality of the vehicle. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall welding fixture.

[0027] Figure 2 This is a schematic diagram showing the positioning of each moving unit of the product by the welding fixture;

[0028] Figure 3 Schematic diagram of the stabilizer bar positioning bracket;

[0029] Figure 4 This is a schematic diagram of the fixture platform;

[0030] Figure 5 This is a schematic diagram showing the overall application of this welding fixture to the product.

[0031] 1. Fixture platform; 2. Induction unit positioning bracket; 3. Balance bar positioning bracket; 4. Side drive body positioning bracket; 5. Transfer case sleeve positioning bracket; 6. Outer plate; 7. Inner plate; 8. Positioning shaft; 9. Fixing screw; 10. Fastening assembly; 11. Fixture platform reference surface; 12. Platform positioning point; 13. Platform lifting point; 14. T-slot anti-deformation structure; 15. Fixture platform positioning surface; 16. Induction wheel bracket (product); 17. Balance bar bracket (product); 18. Side drive support body (product); 19. Transfer case sleeve (product); 20. Body positive assembly welding fixture (tooling); 21. ×× model body (product). Detailed Implementation

[0032] To make the objectives, contents, and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0033] like Figure 1 As shown, this set of vehicle body assembly welding fixtures consists of 1 fixture platform 1, 2 guide unit positioning brackets 2, 10 balance bar positioning brackets 3, 2 side transmission positioning brackets 4, and 1 transfer case sleeve positioning bracket 5.

[0034] The jig platform 1 is machined from a steel plate, and its specific structure is as follows: Figure 4 As shown, the reference surface 11 of the jig platform, after being machined, has a flatness of no more than 1, and serves as the first reference positioning surface for subsequent structural combinations, meaning that all mutual height dimensions are converted to this surface; the platform positioning point 12 is a stepped hole structure, and the jig platform 1 is fastened to the foundation platform by drilling on the foundation platform on site using M20 hexagon socket head cap screws; the platform lifting point 13 can be used with eye bolts to lift the jig platform 1; the T-slot anti-deformation structure 14 serves as a clamping positioning point during actual operation; the jig platform positioning surface 15 is a rectangular stop machined downwards on the jig platform reference surface 11.

[0035] The side transmission positioning bracket 4 consists of a lower plate and an upper cover. The lower plate and the upper cover each have a semi-circular arc. The lower plate and the upper cover are fastened together to form a complete circle using two fixing bolts (M20). A short shaft is clamped in place, and a positioning disc with the same inner circle size as the short shaft is fixed on the short shaft for positioning the side transmission support (product). The two side transmission positioning brackets 4 are symmetrically welded to the right edge of the reference surface 11 of the fixture platform.

[0036] The guiding unit positioning bracket 2 consists of a lower plate and an upper cover. The lower plate and the upper cover each have a semi-circular arc. The lower plate and the upper cover are fastened together to form a complete circle using two fixing bolts (M20). A short shaft is clamped in place. The short shaft is used to position the guiding wheel (product). The two guiding unit positioning brackets 2 are symmetrically welded to the reference surface 11 of the fixture platform. The two guiding unit positioning brackets are arranged on the left edge of the reference surface 11 of the fixture platform. The distance between the center of the bracket and the center of the side transmission positioning bracket 4 is the same as that of the product.

[0037] Balance bar positioning bracket 3 Figure 3As shown, it consists of an outer plate 6, an inner plate 7, a positioning shaft 8, a fixing screw 9, and a fastening assembly 10. The positioning shaft 8 is used to mate with the same-sized hole on the balance bar to achieve horizontal and vertical positioning. The fixing screw 9 is used to fasten the threaded hole on the balance bar to achieve rotational positioning and clamping. The fastening assembly 10 is used to fasten the outer plate 6 and the inner plate 7 to form an integral component. The outer plate 6 is welded to the reference surface 11 of the fixture platform. Ten balance bar positioning brackets 3 are symmetrically distributed on both sides of the reference surface 11 of the fixture platform, located between the side transmission positioning bracket 4 and the induction unit positioning bracket 2. The distance between the center of the bracket and the center of the side transmission positioning bracket 4 is the same as that of the product.

[0038] The transfer case sleeve positioning bracket 5 consists of a lower plate, an upper cover, and a base plate. The lower plate and the upper cover each have a semi-circular arc. The lower plate and the upper cover are fastened together to form a complete circle using two fixing bolts (M20). A sleeve of the same size as the complete circle is clamped in place. The sleeve is used to position the transfer case sleeve (product). The lower plate is welded to the base plate in the center. The base plate is fastened to the fixture platform positioning surface 15 on the fixture platform 1 using four fixing bolts (M20). The distance between the center of the bottom plate and the center of the side transmission positioning bracket 4 is the same as that of the product.

[0039] like Figure 2 As shown, in Figure 1 After all the described requirements have been adjusted, the idler wheel bracket 16 (product) is assembled onto the idler unit positioning bracket 2, the balance bar bracket 17 (product) is assembled onto the balance bar positioning bracket 3, the side drive support 18 (product) is assembled onto the side drive positioning bracket 4, and the transfer case sleeve 19 (product) is assembled onto the transfer case sleeve positioning bracket 5. In this way, the positioning of each traveling unit is completed, and the positional accuracy of each spatial dimension is effectively guaranteed.

[0040] like Figure 5 As shown, the welding jig 20 for this vehicle body is applied to the body 21 of the ×× model, achieving effective overall welding positioning.

[0041] In summary, the reference surface 11 of the jig platform 1 is the first reference surface. The jig platform 1 is adjusted and fixed to the on-site foundation platform. The guide unit positioning bracket 2, the balance bar positioning bracket 3, and the side transmission positioning bracket 4 are welded onto the jig platform reference surface 11 according to the above-mentioned dimensional requirements. The transfer case sleeve positioning bracket 5 is fastened to the jig platform positioning surface 15 to form a complete set of vehicle body positive assembly welding jig. The product is positioned on the welding jig to ensure the relative positional accuracy of each space.

[0042] As can be seen from the above technical solution, the present invention has the following significant features:

[0043] Based on the above description, this welding jig can meet the various spatial positioning dimensional requirements of the product. In addition to meeting the spatial positioning dimensional requirements, this car body assembly welding jig also has the following characteristics:

[0044] 1. The sandwich structure of the stabilizer bar positioning bracket uses a mature mechanical fastening method for the outer and inner layers, and is designed to be detachable. After the vehicle body is finally welded and the fixture needs to be removed, the fastening assembly 10 is disassembled, and the vehicle body, along with the inner plate 7, is removed from the fixture. The outer plate 6 remains connected to the fixture platform reference surface 11. Then, the fixing bolts 9 are removed, and the inner plate 7 is removed from the vehicle body stabilizer bar and aligned with the outer plate 6. Figure 3 Reassembly allows for batch repetitive operations, enabling convenient reuse, enhancing practicality, and saving time and costs. In particular, it can significantly improve production efficiency for multi-unit production modes where each unit is produced individually.

[0045] II. The sandwich structure of the balance bar positioning bracket has a positioning shaft 8 and a fixing bolt 9, which can perfectly restrict all degrees of freedom of the balance bar in the horizontal, vertical and rotational directions, resulting in a more stable positioning effect, higher product accuracy, and stronger performance in overcoming welding deformation.

[0046] 3. The jig platform 1 is machined from a single plate with high precision. The T-slot anti-deformation structure 14 in the jig platform 1 is specifically designed in this welding jig. During vehicle body welding operations, the T-slot acts as the point of action, and together with the process tie rod in the process specification, it is clamped in the parts that are prone to welding deformation. However, it is not only applicable to vehicle body assembly scenarios, but also applicable to welding scenarios of other components. For example, it can play its clamping performance in the welding of large components of existing armored vehicle operation systems (welding of shovel device, winch device, and boom), and resist the phenomenon that the product is prone to "bowing" after welding.

[0047] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A vehicle body assembly welding fixture, characterized in that, It consists of 1 fixture platform (1), 2 guide unit positioning brackets (2), 10 balance bar positioning brackets (3), 2 side transmission positioning brackets (4), and 1 transfer case sleeve positioning bracket (5); The jig platform (1) has a jig platform reference surface (11) on it, which serves as the first reference positioning surface for subsequent structural combinations. The jig platform (1) is fastened to the base platform. The jig platform (1) has multiple T-slot anti-deformation structures (14) that are spaced and parallel. The end of the jig platform (1) has a jig platform positioning surface (15), which is a rectangular stop facing downward from the jig platform reference surface (11). The T-slot anti-deformation structure (14) is a T-slot. The side drive positioning bracket (4) consists of a lower plate and an upper cover. The semi-circular arc of the lower plate and the upper cover is fastened to form a full circular hole. The short shaft is clamped in the full circular hole, and the inner side of the short shaft is connected to the fixed positioning plate. The line connecting the two side drive positioning brackets (4) is arranged parallel to the T-slot and symmetrically located on the right edge of the reference plane (11) of the fixture platform. The guiding unit positioning bracket (2) consists of a lower plate and an upper cover. The semi-circular arc of the lower plate and the upper cover is fastened to form a full circular hole. The short shaft is clamped in the full circular hole and extends inward parallel to the T-slot. The two guiding unit positioning brackets (2) are symmetrical and the connecting line is parallel to the T-slot. They are located on the left edge of the reference plane (11) of the fixture platform. The balance bar positioning bracket (3) consists of an outer plate (6), an inner plate (7), a positioning shaft (8), and a fixing screw (9). The lower end face of the outer plate (6) is fixedly connected to the reference surface (11) of the jig platform. The inner plate (7) is detachably connected to the inner side of the outer plate (6). The inner plate (7) has a through hole for the fixing screw (9) to pass through. At the same time, the fixing bolt (9) passes through the threaded hole on the balance shaft of the product to be used to fix the balance shaft of the product. The positioning shaft (8) is fixed on the inner plate (7). The positioning shaft (8) is matched with the hole of the balance bar of the product to be used. Ten balance bar positioning brackets (3) are symmetrically distributed on both sides of the reference surface (11) of the jig platform and are located between the side transmission positioning bracket (4) and the induction unit positioning bracket (2). The transfer case sleeve positioning bracket (5) is located at the rightmost end of the reference plane (11) of the jig platform, and extends the sleeve to the front end. The sleeve is used to position the transfer case sleeve of the product.

2. The vehicle body positive assembly welding fixture according to claim 1, characterized in that, The transfer case positioning bracket (5) consists of a lower plate, an upper cover and a bottom plate. The lower plate and the upper cover each have a semi-circular arc. The lower plate and the upper cover are fastened together with fixing bolts to form a complete circle. A sleeve of the same size as the complete circle is clamped together. The lower plate is welded to the bottom plate in the center. The bottom plate is fastened to the positioning surface (15) of the jig platform (1) on the jig platform (1) with fixing bolts.

3. The vehicle body positive assembly welding fixture according to claim 1, characterized in that, The flatness of the reference surface (11) of the fixture platform is not greater than 1.

4. The vehicle body positive assembly welding fixture according to claim 1, characterized in that, The platform positioning point (12) is located on the jig platform (1) and has a stepped hole structure.

5. The vehicle body positive assembly welding fixture according to claim 1, characterized in that, Secure the jig platform (1) to the base platform using hexagon socket head cap screws.

6. The vehicle body positive assembly welding fixture according to claim 1, characterized in that, The jig platform (1) has a platform lifting point (13), which is used with eye bolts to lift the jig platform (1).

7. The vehicle body positive assembly welding fixture according to claim 1, characterized in that, The inner plate (7) and outer plate (6) of the balance bar positioning bracket (3) are fastened together by fastening assembly (10) to form an integral component.

8. The vehicle body positive assembly welding fixture according to claim 1, characterized in that, The lower end of the inner plate (7) of the balance bar positioning bracket (3) is higher than the lower end of the outer plate (6).

9. The vehicle body positive assembly welding fixture according to claim 1, characterized in that, The transfer case is positioned on the positioning surface (15) of the fixture platform.

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