A positioning fixture for welding the cover of a large loader.

Abstract

The application discloses a positioning tool for spliced welding of a large-scale shovel cover, and belongs to the technical field of cover welding, which comprises a bottom frame, and an upper positioning frame is fixedly welded to the top of the bottom frame; the application is characterized in that a bottom positioning hole is preset on the bottom frame, and the bottom connecting part of the vehicle body cover is threadedly connected with the bottom positioning hole through a fixing screw, so as to limit the displacement of the vehicle body cover in the up-down direction and the left-right direction; a side positioning hole is formed in the upper positioning frame, so that the side connecting part of the vehicle body cover can be fixedly connected with the side positioning hole through a fixing screw, and the displacement of the vehicle body cover in the front-rear direction is further limited, that is, the positioning tool limits and fixes the bottom and the side of the vehicle body cover, so that the vehicle body cover is limited in the preset position in the whole spliced welding process, workers only need to complete welding according to the standardized process, and it is unnecessary to adjust the size depending on experience, which helps to eliminate the welding error caused by human differences and ensures the welding quality.

Description

Technical Field

[0001] This application relates to the field of casing welding technology, and in particular to a positioning tool for welding casings of large loader trucks. Background Technology

[0002] In the manufacturing process of large earthmoving vehicles, the welding of the casing is one of the key processes, as the dimensional accuracy of the casing directly affects the overall assembly quality and appearance of the large earthmoving vehicle. Currently, the welding of the casing of large earthmoving vehicles is mostly carried out manually.

[0003] In the existing welding process of large loader covers, due to the differences in each worker's operating techniques, welding force, and welding sequence, slight deviations in the external dimensions of each welded cover are inevitable, making it impossible to achieve precise control of the welded cover dimensions. Therefore, an improvement has been made to a positioning tooling for welding large loader covers. Utility Model Content

[0004] In view of the shortcomings of the prior art, this application provides a positioning tooling for welding the cover of a large loader, which overcomes the shortcomings of the prior art and aims to solve the problems in the prior art.

[0005] To achieve the above objectives, this application provides the following technical solution: a positioning fixture for welding the cover of a large loader, comprising a bottom frame, an upper positioning frame fixedly welded to the top of the bottom frame, a vehicle body cover placed on the top of the upper positioning frame, a bottom positioning hole formed on the upper surface of the bottom frame below the vehicle body cover, a bottom connecting part provided at the bottom of the vehicle body cover, the bottom connecting part being fixedly connected to the bottom positioning hole by fixing screws, a side positioning hole formed on the outer wall of the upper positioning frame at the rear side of the vehicle body cover, a side connecting part being provided at the rear side of the vehicle body cover, the side connecting part being fixedly connected to the side positioning hole by fixing screws.

[0006] By adopting the above technical solution, the bottom frame has a pre-set bottom positioning hole under the vehicle body cover, and the bottom connecting part of the vehicle body cover is threaded to the bottom positioning hole by fixing screws to limit the displacement of the vehicle body cover in the vertical and horizontal directions. By opening side positioning holes on the upper positioning frame, the side connecting part of the vehicle body cover can be fixedly connected to the side positioning hole by fixing screws, further limiting the displacement of the vehicle body cover in the front and rear directions. That is, by limiting and fixing the bottom and sides of the vehicle body cover, the positioning fixture firmly limits the vehicle body cover to the preset precise position throughout the welding process. Workers only need to complete the welding according to the standardized process, without relying on experience to adjust the size, which helps to eliminate welding errors caused by human differences and ensure welding quality.

[0007] As a preferred technical solution of this application, the outer wall of the bottom connecting part is provided with a bottom connecting hole for the fixing screw to pass through, and the outer wall of the side connecting part is provided with a side connecting hole for the fixing screw to pass through, and both the bottom connecting hole and the side connecting hole are arc-shaped holes.

[0008] By adopting the above technical solution, before the vehicle body cover is welded, its bottom connection part and side connection part may have slight dimensional deviations due to the previous processing. The bottom connection hole and side connection hole with arc hole design can allow the fixing screw to move slightly along the arc trajectory in the hole, so that the alignment and fixing of the vehicle body cover and the positioning fixture can be completed without re-drilling.

[0009] As a preferred technical solution of this application, the upper positioning frame is mainly composed of three long positioning columns and two short positioning columns, and a connecting beam is fixedly welded between the long positioning columns and the short positioning columns. The long positioning columns and the short positioning columns are both fixedly welded to the top of the bottom frame, and a connecting block is fixedly welded to the outer wall of the long positioning columns and the top of the bottom frame.

[0010] By adopting the above technical solution, the long positioning column and the short positioning column are connected together in series by the connecting beam to form a whole, which is used to distribute the pressure of the vehicle body shell, prevent the upper positioning frame from bending and deforming due to excessive local stress, and ensure the overall structural rigidity of the upper positioning frame. The connecting block is used to increase the welding contact area and improve the connection strength between the upper positioning frame and the bottom frame.

[0011] As a preferred technical solution of this application, a second support pad is fixedly connected to the outer wall of the long positioning post in front of the side positioning hole. The second support pad is located between the long positioning post and the side connection part. A third support pad is fixedly connected to the top of the short positioning post. The third support pad is located between the short positioning post and the vehicle body cover.

[0012] By adopting the above technical solution and setting support pad two and support pad three, direct contact between the vehicle body cover and the upper positioning frame is avoided, and the relative friction between the two during the welding process is prevented from causing wear on the surface coating of the vehicle body cover or scratches on the metal.

[0013] As a preferred technical solution of this application, a support pad is fixedly connected to the upper surface of the bottom frame above the bottom positioning hole, and the upper surface of the support pad is in contact with the lower surface of the bottom connection part.

[0014] By adopting the above technical solution, and by setting up support pads, the direct contact between the vehicle body cover and the bottom frame is avoided, thereby protecting the appearance of the vehicle body cover.

[0015] As a preferred technical solution of this application, the outer walls of the first support pad and the second support pad are all provided with circular holes for the fixing screws to pass through, and the first support pad, the second support pad and the third support pad are all rubber pads.

[0016] By adopting the above technical solution, the presence of the round hole ensures that the fixing screw can pass smoothly through support pad one and support pad two. Support pad one, support pad two and support pad three, which are made of rubber material, can increase the friction between the vehicle body cover and the positioning fixture, prevent the vehicle body cover from slipping slightly due to vibration during welding, and further ensure positioning stability.

[0017] In summary, the beneficial effects of this application are as follows: In this application, the bottom frame has a pre-set bottom positioning hole below the vehicle body cover, and the bottom connecting part of the vehicle body cover is threaded to the bottom positioning hole by fixing screws to limit the displacement of the vehicle body cover in the vertical and horizontal directions. By opening side positioning holes on the upper positioning frame, the side connecting part of the vehicle body cover can be fixedly connected to the side positioning hole by fixing screws, further limiting the displacement of the vehicle body cover in the front and rear directions. That is, by limiting and fixing the bottom and sides of the vehicle body cover, the positioning fixture firmly limits the vehicle body cover to the preset precise position throughout the welding process. Workers only need to complete the welding according to the standardized process, without relying on experience to adjust the size, which helps to eliminate welding errors caused by human differences and ensure welding quality. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 This is a partial structural diagram of this application; Figure 3 This is a schematic diagram of the composition of the upper positioning frame of this application; Figure 4 This is a structural schematic diagram of the vehicle body cover of this application.

[0019] Explanation of reference numerals in the attached figures: 1. Bottom frame; 2. Upper positioning frame; 201. Long positioning post; 202. Short positioning post; 203. Connecting crossbeam; 204. Connecting block; 3. Vehicle body cover; 4. Side connecting part; 5. Side connecting hole; 6. Bottom connecting part; 7. Bottom connecting hole; 8. Bottom positioning hole; 9. Support pad one; 10. Fixing screw; 11. Side positioning hole; 12. Support pad two; 13. Support pad three. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this application easy to understand, the following describes this application in conjunction with specific implementation methods.

[0021] like Figure 1 - Figure 4 As shown, this embodiment provides a positioning fixture for welding the cover of a large loader, including a bottom frame 1. An upper positioning frame 2 is fixedly welded to the top of the bottom frame 1. A vehicle body cover 3 is placed on top of the upper positioning frame 2. A bottom positioning hole 8 is formed on the upper surface of the bottom frame 1 below the vehicle body cover 3. A bottom connecting part 6 is provided at the bottom of the vehicle body cover 3, and the bottom connecting part 6 is fixedly connected to the bottom positioning hole 8 by fixing screws 10. A side positioning hole 11 is formed on the outer wall of the upper positioning frame 2 at the rear side of the vehicle body cover 3. A side connecting part 4 is provided on the rear side of the vehicle body cover 3, and the side connecting part 4 is fixedly connected to the side positioning hole 11 by fixing screws 10. In use, the bottom frame 1 is positioned below the vehicle body cover 3. The bottom positioning hole 8 is used to connect the bottom connecting part 6 of the vehicle body cover 3 to the bottom positioning hole 8 by means of fixing screw 10. This is used to limit the displacement of the vehicle body cover 3 in the vertical and horizontal directions. By opening the side positioning hole 11 on the upper positioning frame 2, the side connecting part 4 of the vehicle body cover 3 can be fixedly connected to the side positioning hole 11 by means of fixing screw 10, which further limits the displacement of the vehicle body cover 3 in the front and rear directions. That is, by limiting and fixing the bottom and side of the vehicle body cover 3, the positioning fixture ensures that the vehicle body cover 3 is firmly fixed in the preset precise position throughout the welding process. Workers only need to complete the welding according to the standardized process, without relying on experience to adjust the size. This helps to eliminate welding errors caused by human differences and ensures welding quality.

[0022] In this embodiment, as Figure 1 and 4 As shown, the outer wall of the bottom connecting part 6 is provided with a bottom connecting hole 7 for the fixing screw 10 to pass through, and the outer wall of the side connecting part 4 is provided with a side connecting hole 5 for the fixing screw 10 to pass through. Both the bottom connecting hole 7 and the side connecting hole 5 are arc-shaped holes. In use, before the vehicle body cover 3 is welded, its bottom connecting part 6 and side connecting part 4 may have slight dimensional deviations due to the previous processing. The arc-shaped bottom connecting hole 7 and side connecting hole 5 allow the fixing screw 10 to move slightly along the arc trajectory in the hole, so that the alignment and fixing of the vehicle body cover 3 and the positioning fixture can be completed without re-drilling.

[0023] In this embodiment, as Figure 1 and 3As shown, the upper positioning frame 2 mainly consists of three long positioning columns 201 and two short positioning columns 202. A connecting beam 203 is fixedly welded between the long positioning columns 201 and the short positioning columns 202. The long positioning columns 201 and the short positioning columns 202 are both fixedly welded to the top of the bottom frame 1. A connecting block 204 is fixedly welded to the outer wall of the long positioning columns 201 and the short positioning columns 202 and the top of the bottom frame 1. In use, the long positioning columns 201 and the short positioning columns 202 are connected together in series by the connecting beam 203 to form a whole. This is used to distribute the pressure of the vehicle body shell 3, prevent the upper positioning frame 2 from bending and deforming due to excessive local stress, and ensure the overall structural rigidity of the upper positioning frame 2. The connecting block 204 is used to increase the welding contact area and improve the connection strength between the upper positioning frame 2 and the bottom frame 1.

[0024] In this embodiment, as Figure 1 , 3 As shown in Figure 4, a second support pad 12 is fixedly connected to the outer wall of the long positioning post 201 in front of the side positioning hole 11. The second support pad 12 is located between the long positioning post 201 and the side connecting part 4. A third support pad 13 is fixedly connected to the top of the short positioning post 202. The third support pad 13 is located between the short positioning post 202 and the vehicle body cover 3. In use, by setting the second support pad 12 and the third support pad 13, the vehicle body cover 3 is prevented from directly contacting the upper positioning frame 2, and the relative friction between the two during the welding process is prevented from causing wear of the coating or scratches on the metal of the vehicle body cover 3.

[0025] In this embodiment, as Figure 1 , 3 As shown in Figure 4, a support pad 9 is fixedly connected to the upper surface of the bottom frame 1 above the bottom positioning hole 8. The upper surface of the support pad 9 is in contact with the lower surface of the bottom connecting part 6. In use, by setting the support pad 9, the vehicle body cover 3 is prevented from directly contacting the bottom frame 1, thereby protecting the appearance of the vehicle body cover 3.

[0026] In this embodiment, as Figure 3 As shown, the outer walls of support pad 1 9 and support pad 2 12 are all provided with circular holes for the fixing screw 10 to pass through. Support pad 1 9, support pad 2 12 and support pad 3 13 are all rubber pads. In use, the presence of the circular holes ensures that the fixing screw 10 can pass smoothly through support pad 1 9 and support pad 2 12. Support pad 1 9, support pad 2 12 and support pad 3 13, which are made of rubber material, can increase the friction between the vehicle body cover 3 and the positioning fixture, prevent the vehicle body cover 3 from slipping slightly due to vibration during welding, and further ensure positioning stability.

[0027] Working principle: When using the positioning fixture for welding the cover of a large loader according to this application, the worker first checks the welding integrity of the bottom frame 1 and the upper positioning frame 2. After the inspection is completed, the vehicle cover 3 is placed on top of the upper positioning frame 2, so that the bottom connecting part 6 of the vehicle cover 3 is aligned with the support pad 9 on the bottom frame 1, the side connecting part 4 of the vehicle cover 3 is aligned with the support pad 12 on the long positioning post 201, and the other areas of the bottom of the vehicle cover 3 are in contact with the support pad 13 on the top of the short positioning post 202, thereby achieving the initial support and positioning of the vehicle cover 3. Then, the fixing screw 10 is passed through the bottom connecting hole 7 of the bottom connecting part 6 and the round hole of the support pad 9, and screwed into the bottom positioning hole 8 of the bottom frame 1. Similarly, the fixing screw 10 is passed through the side connecting hole 5 and the support pad 12 and screwed into the side positioning hole 11, thus completing the fixing of the vehicle cover 3. Finally, the worker welds the splice seam of the vehicle cover 3 according to the preset welding process.

[0028] The present application has been described above with reference to specific embodiments. However, those skilled in the art should understand that these descriptions are exemplary and not intended to limit the scope of protection of the present application. Those skilled in the art can make various modifications and variations to the present application based on its spirit and principles, and these modifications and variations are also within the scope of the present application.

Claims

1. A positioning fixture for welding the cover of a large loader, comprising a bottom frame (1), characterized in that, The top of the bottom frame (1) is fixedly welded with an upper positioning frame (2), and a vehicle body cover (3) is placed on the top of the upper positioning frame (2). The upper surface of the bottom frame (1) is provided with a bottom positioning hole (8) below the vehicle body cover (3). The bottom of the vehicle body cover (3) is provided with a bottom connecting part (6), and the bottom connecting part (6) is fixedly connected to the bottom positioning hole (8) by a fixing screw (10). The outer wall of the upper positioning frame (2) is provided with a side positioning hole (11) on the rear side of the vehicle body cover (3). The rear side of the vehicle body cover (3) is provided with a side connecting part (4), and the side connecting part (4) is fixedly connected to the side positioning hole (11) by a fixing screw (10).

2. The positioning fixture for welding the cover of a large loader according to claim 1, characterized in that, The outer wall of the bottom connecting part (6) is provided with a bottom connecting hole (7) through which the fixing screw (10) passes, and the outer wall of the side connecting part (4) is provided with a side connecting hole (5) through which the fixing screw (10) passes. Both the bottom connecting hole (7) and the side connecting hole (5) are arc-shaped holes.

3. The positioning fixture for welding the cover of a large loader according to claim 1, characterized in that, The upper positioning frame (2) is mainly composed of three long positioning columns (201) and two short positioning columns (202), and a connecting beam (203) is fixedly welded between the long positioning columns (201) and the short positioning columns (202). The long positioning columns (201) and the short positioning columns (202) are both fixedly welded to the top of the bottom frame (1), and the outer walls of the long positioning columns (201) and the short positioning columns (202) are fixedly welded to the top of the bottom frame (1) with connecting blocks (204).

4. A positioning fixture for welding the cover of a large loader according to claim 3, characterized in that, The outer wall of the long positioning post (201) is fixedly connected to the front side of the side positioning hole (11) with a second support pad (12). The second support pad (12) is located between the long positioning post (201) and the side connection part (4). The top of the short positioning post (202) is fixedly connected to a third support pad (13). The third support pad (13) is located between the short positioning post (202) and the vehicle body shell (3).

5. A positioning fixture for welding the cover of a large loader according to claim 4, characterized in that, The upper surface of the bottom frame (1) is fixedly connected to a support pad (9) above the bottom positioning hole (8), and the upper surface of the support pad (9) is in contact with the lower surface of the bottom connecting part (6).

6. A positioning fixture for welding the cover of a large loader according to claim 5, characterized in that, The outer walls of the first support pad (9) and the second support pad (12) are provided with round holes through which the fixing screw (10) passes, and the first support pad (9), the second support pad (12) and the third support pad (13) are all rubber pads.

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