Cargo box rear tailgate, cargo box, dump truck and manufacturing method

Abstract

The present invention discloses a cargo box tailgate, a cargo box, a dump truck, and a manufacturing method. The tailgate comprises a door panel, connecting arms, an upper crossbeam, a middle crossbeam, and a lower crossbeam. Connecting arms are provided at the left and right ends of the outer side of the door panel. The connecting arms are 7-shaped arm plates, with the lower end adjacent to the lower edge of the door panel and the upper end extending a certain distance beyond the upper edge of the door panel. An upper crossbeam, a middle crossbeam, and a lower crossbeam are sandwiched between the two connecting arms. The upper crossbeam abuts the upper edge of the door panel, the middle crossbeam abuts the middle area of ​​the door panel, and the lower crossbeam abuts the lower edge of the door panel. The height of the connecting arms gradually decreases from top to bottom, and the cross-sectional heights of the upper, middle, and lower crossbeams decrease accordingly. The upper ends of the connecting arms are hingedly connected to the rear of the cargo box to allow the tailgate to rotate relative to the box. The tailgate disclosed in the present invention has a simple structure, requires minimal welding, is easy to manufacture, has a high load-bearing capacity, reduces stress concentration and welding stress, can adapt to impact forces and alternating stresses during operation, reduces cracking, and improves production efficiency.

Description

Technical Field

[0001] The invention relates to a cargo box rear door and belongs to the technical field of dump trucks. Background Art

[0002] The cargo box is the operating tool of the dump truck and can be used for the transfer and transportation of materials. Materials that can be transported include soil, rocks, concrete or any other bulk materials or material mixtures. After the material is loaded, the material must be placed in the dump truck cargo box during its transportation. During transportation, the rear tailgate of the cargo box is used to hold the material behind the cargo box to prevent it from spilling from the rear side. During unloading, the rear tail hook opens, and as the cargo box rises, the rear tailgate will open with the cargo box to dump the material. When loading materials, the falling material will impact the door panel of the rear tailgate. When transporting uphill, the rear tailgate will be under the weight of the material. The existing rear tailgate structure is generally a field welded structure, and one side is provided with a relatively dense and large number of horizontal and vertical channel steels and reinforcement plates. The complex structure, heavy welding effort, and the need for multiple rotations and repositioning during welding make manufacturing difficult and lead to long production cycles. Furthermore, existing tailgates, due to their densely packed, interlocking structures, experience significant stress concentration and welding stress. During actual operation, impact and alternating stresses can easily lead to fatigue cracking, requiring frequent welding repairs and impacting production efficiency. The tailgate's hinged base is also constructed of multiple panels, making it prone to breakage during use, potentially causing the tailgate to fall off. Summary of the Invention

[0003] In order to solve the problems existing in the prior art, the present invention proposes a cargo box tailgate with a simple structure, less welding, easy manufacturing, high load-bearing capacity, less stress concentration and welding stress, and the ability to adapt to the impact force and alternating stress during operation, reduce the occurrence of cracking, and improve production efficiency.

[0004] To achieve the above object, the technical solution provided by the present invention is:

[0005] The first aspect of the present invention discloses a cargo box tailgate, comprising:

[0006] Door panel, in the non-unloading stage, the door panel is attached to the rear end of the cargo box to block the material;

[0007] The connecting arms are symmetrically arranged at the left and right ends of the outer side of the door panel, with the lower end close to the lower edge of the door panel and the upper end extending beyond the upper edge of the door panel and hinged to the rear of the cargo box;

[0008] The upper crossbeam is located between the two connecting arms and is close to the edge of the door panel;

[0009] The middle cross member is located between the two connecting arms and is close to the middle area of ​​the door panel;

[0010] The lower crossbeam is located between the two connecting arms and is close to the lower edge of the door panel;

[0011] Among them, the height of the connecting arm gradually decreases from top to bottom, and the cross-sectional heights of the upper beam, the middle beam and the lower beam are correspondingly reduced in sequence.

[0012] In some embodiments, the connecting arm is a 7-shaped arm plate as a whole, and the upper end of the connecting arm has a bent ear with a pin shaft hole, which is connected to the upper hinge support along the side of the cargo box through the pin shaft to enable the tailgate to rotate around the pin shaft.

[0013] In some embodiments, the upper crossbeam is a bent part formed by three bends to form four planar walls, the first wall and the second wall wrap the upper edge of the door panel, and the first wall is welded to the inner side of the door panel; the plane of the third wall is parallel to the outer edge of the connecting arm, and the second wall and the fourth wall are both at obtuse angles to the third wall; the second wall is at a certain angle to the horizontal plane, and the edge of the fourth wall is welded close to the outer side of the door panel.

[0014] In some embodiments, the middle cross beam is a bent part formed by two bends to form three planar walls. The plane of the second wall is parallel to the outer edge of the connecting arm. The first wall and the third wall both form obtuse angles with the second wall. The edges of the first wall and the third wall are welded close to the outer side of the door panel.

[0015] In some embodiments, the lower cross beam is a bent part formed by two bends to form three sections of planar walls. The plane of the second wall is parallel to the outer edge of the connecting arm, the first wall and the third wall both form obtuse angles with the second wall, and the edges of the first wall and the third wall are welded close to the outer side of the door panel.

[0016] In some embodiments, two symmetrically arranged pads are welded to the surface of the second wall of the lower cross beam, and the lower edge of the pads is close to the lower end of the second wall of the lower cross beam. In the non-unloading stage, the rear tail hook on the cargo box is always pressed on the pads to keep the rear tailgate in a locked and closed state.

[0017] In some embodiments, two symmetrically arranged inner supports are provided on the inner side of the lower crossbeam, and the inner supports are connected to the lower crossbeam by welding; the inner support includes vertical ribs, transverse rib one, and transverse rib two; the contour of the vertical ribs fits the inner cross-section of the lower crossbeam, and the two vertical ribs are aligned with the left and right sides of the pad respectively; transverse rib one is sandwiched between the inner sides of the two vertical ribs, and transverse rib one is aligned with the upper edge of the pad; one end of the two transverse ribs are respectively tightly attached to the outer sides of the two vertical ribs and aligned with transverse rib one.

[0018] In some embodiments, the door panel, connecting arm, upper crossbeam, middle crossbeam and lower crossbeam are connected by welding; the weld between the first wall of the upper crossbeam and the door panel is on the back side, and the remaining welds between the upper crossbeam, the connecting arm and the door panel are all on the front side; the welds between the middle crossbeam, the connecting arm and the door panel are all on the front side; the welds between the lower crossbeam, the connecting arm and the door panel are all on the front side; the welds between the connecting arm and the door panel are all on the front side.

[0019] In some embodiments, two symmetrically placed lifting ears are provided on the top of the upper cross beam for lifting the tailgate.

[0020] A second aspect of the present invention discloses a cargo box, comprising:

[0021] A box body consisting of a front baffle, a bottom plate, and left and right side plates;

[0022] Hinge support, symmetrically installed at the upper edge ends of the left and right side panels;

[0023] The above-mentioned cargo box rear tailgate is connected to the hinge support through a pin shaft and can rotate around the hinge support;

[0024] The rear tail hook is installed at the tail of the box and can rotate around the tail of the box;

[0025] A zipper, one end of which is connected to the frame beam and the other end is connected to the rear tail hook;

[0026] During the non-unloading stage, the rear hook on the box body is always pressed against the pad on the tailgate by the zipper, so that the tailgate is in a locked and closed state; during the unloading stage, the box body is flipped up, the zipper is loosened, the rear hook is separated from the pad, so that the tailgate is in an unlocked state, the box body continues to flip up, and the tailgate rotates around the hinge support to open.

[0027] A third aspect of the present invention discloses a dump truck equipped with the above-mentioned cargo box rear tailgate; or equipped with the above-mentioned cargo box.

[0028] The fourth aspect of the present invention discloses a method for manufacturing a cargo box tailgate:

[0029] Use a tooling shaft to pass through the pin holes of the two connecting arms to ensure their coaxiality;

[0030] Use fixtures to fix the door panel and two connecting arms, making sure the connecting arms are close to the left and right sides of the door panel. Ensure that the distance between the two connecting arms is larger than the three crossbeams. Then weld double-sided fillet welds at the junction of the connecting arms and the door panel. Before welding, make sure that the fixtures can always fix and clamp the door panel to prevent excessive deformation caused by welding.

[0031] Weld the pad to the outside of the lower beam, and weld the inner support to the inside of the lower beam, ensuring that the vertical and horizontal ribs of the inner support are aligned with the left and right sides and top of the pad, and then weld them together;

[0032] Install the three crossbeams between the two connecting arms, with each of them close to the corresponding position of the door panel. First, fix them by spot welding or segment welding, then remove the fixtures except the tooling shaft, and weld the upper crossbeam, middle crossbeam, lower crossbeam and door panel in turn. Then, slightly lift the upper and lower ends of the door panel in turn to weld the ends of the three crossbeams to the connecting arms. Finally, flip the tailgate over once and weld the first wall of the upper crossbeam to the back of the door panel.

[0033] Based on the application of the above technical solutions, the present invention has the following beneficial effects compared with the prior art:

[0034] The present invention proposes a cargo box tailgate with a simple structure, less welding, easy manufacturing, high load-bearing capacity, less stress concentration and welding stress, capable of adapting to impact force and alternating stress during operation, reducing cracking and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings, as part of this disclosure, are intended to provide a further understanding of the disclosure. The exemplary embodiments of the disclosure and their descriptions are intended to explain the disclosure and do not constitute undue limitations thereon. Obviously, the drawings described below are merely examples, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0036] In the attached figure:

[0037] Figure 1 This is a structural diagram of a cargo box with a rear tailgate according to the present invention;

[0038] Figure 2 This is a structural diagram of the cargo box rear door according to the present invention;

[0039] Figure 3 This is a cross-sectional view of the rear tailgate of the cargo box according to the present invention;

[0040] Figure 4 This is a diagram of the internal support structure on the lower cross beam described in the present invention.

[0041] Explanation of the accompanying reference numerals: 1. cargo box; 2. hinge support; 3. pin shaft; 4. tailgate; 5. tail hook; 6. zipper; 10. connecting arm; 11. upper crossbeam; 12. lifting ear; 13. middle crossbeam; 14. pad; 15. lower crossbeam; 16. door panel; 17. pin shaft hole; 20. first wall; 21. second wall; 22. third wall; 23. fourth wall; 24. first wall; 25. second wall; 26. third wall; 27. first wall; 28. second wall; 29. ​​third wall; 31. inner support; 32. second horizontal rib; 33. vertical rib; 34. first horizontal rib.

[0042] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0044] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0045] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0046] Figure 1 、 Figure 2 As shown, a tailgate 4 is installed at the rear of the cargo box 1. The tailgate 4 is connected to the hinge support 2 via a pin 3 and can rotate around the hinge support 2. The hinge support 2 rotates around the cargo box via the pin 3. There are two hinge supports 2, located on the left and right sides of the cargo box 1, which have the effect of adjusting assembly errors and buffering. The lower end of the zipper 6 is connected to the frame beam, and the other end is connected to the rear hook 5. The rear hook 5 is hingedly connected to the cargo box 1 and can rotate around the rear of the cargo box 1. In the non-unloading stage, the rear hook 5 on the cargo box 1 is always pressed on the pad 14 by the zipper 6, so that the tailgate 4 is in a locked and closed state. In the unloading stage, the cargo box 1 is flipped up, the zipper 6 is loosened, and the rear hook 5 is separated from the pad 14, so that the tailgate 4 is in an unlocked state. The cargo box 1 continues to flip up, and the tailgate 4 rotates open around the hinge support 2.

[0047] The tailgate 4 includes a door panel 16, a connecting arm 10, an upper crossbeam 11, a middle crossbeam 13, and a lower crossbeam 15. The door panel 16 is a square plate. During the non-unloading stage, the door panel 16 fits against the rear end of the cargo box 1 to block materials. Connecting arms 10 are provided at both ends of the outer side of the door panel 16 and are symmetrically placed. The connecting arm 10 is a 7-shaped arm plate, with the lower end close to the lower edge of the door panel 16 and the upper end extending beyond the upper edge of the door panel 16. The upper crossbeam 11, the middle crossbeam 13, and the lower crossbeam 15 are sandwiched between the two connecting arms 10. The upper crossbeam 11 is close to the upper edge of the door panel 16, the middle crossbeam 13 is close to the middle area of ​​the door panel 16, and the lower crossbeam 15 is close to the lower edge of the door panel 16. The height of the connecting arm 10 gradually decreases from top to bottom, and the cross-sectional heights of the upper crossbeam 11, the middle crossbeam 13, and the lower crossbeam 15 decrease accordingly. The door panel 16, connecting arm 10, upper crossbeam 11, middle crossbeam 13, and lower crossbeam 15 are welded together. The upper end of the connecting arm 10 has a curved lug with a pin hole 17. This lug is connected to the upper hinge support 2 along the side of the cargo box 1 via a pin 3. This allows the tailgate 4 to rotate about the pin 3, thereby opening and closing the tailgate 4 relative to the cargo box 1. Two symmetrically placed lifting lugs 12 are also located at the top of the upper crossbeam 11 for hoisting the tailgate 4, facilitating its installation and removal.

[0048] Figure 3 As shown, the upper crossbeam 11 is a bent part formed by three bends to form four flat walls. The first wall 20 and the second wall 21 wrap the upper edge of the door panel 16. The first wall 20 is welded to the inner side of the door panel 16 to prevent the upper edge of the door panel 16 and the connecting weld from being cracked by falling rocks. The plane of the third wall 22 is parallel to the outer edge of the connecting arm 10. The second wall 21 and the fourth wall 23 are at an obtuse angle to the third wall 22. The second wall 21 is at a certain angle to the horizontal plane to prevent materials from piling up and spilling during transportation. The edge of the fourth wall 23 is welded close to the outer side of the door panel 16. The middle crossbeam 13 is a bent part formed by two bends to form three flat walls. The plane of the second wall 25 is parallel to the outer edge of the connecting arm 10. The first wall 24 and the third wall 26 are at an obtuse angle to the second wall 25. The edges of the first wall 24 and the third wall 26 are welded close to the outer side of the door panel 16. The lower crossbeam 15 is a bent member formed by two bends into three planar walls. The second wall 28 is parallel to the outer edge of the connecting arm 10. The first and third walls 27 and 29 form obtuse angles with the second wall 28. The edges of the first and third walls 27 and 29 are welded closely to the outer surface of the door panel 16. Only the weld between the first wall 20 of the upper crossbeam and the door panel 16 is on the back side. The remaining welds between the three crossbeams and the connecting arm 10, and between the connecting arm 10 and the door panel 16, are on the front side. This allows for welding on the same side, reducing the number of turns required during welding. Two symmetrically arranged backing plates 14 are welded to the surface of the second wall 28 of the lower crossbeam 15. These backing plates 14 are rectangular in shape, with their lower edges near the lower end of the second wall 28 of the lower crossbeam 15. During the non-unloading phase, the rear hook 5 on the cargo box is pressed against the backing plates 14 by the zipper 6, keeping the tailgate 4 locked and closed.

[0049] Figure 4 As shown, two symmetrically arranged inner supports 31 are provided on the inner side of the lower crossbeam 15. These inner supports 31 include vertical ribs 33, transverse rib 1 34, and transverse rib 2 32. The contours of the vertical ribs 33 conform to the inner cross-section of the lower crossbeam 15, and the two vertical ribs 33 align with the left and right edges of the pad 14, respectively. Transverse rib 1 34 is sandwiched between the two vertical ribs 33, and is aligned with the upper edge of the pad 14. One end of the two transverse ribs 32 rests against the outer sides of the two vertical ribs 33 and aligns with transverse rib 1 34. The inner supports 31 are welded to the lower crossbeam 15, enhancing its strength.

[0050] The present invention also provides a method for manufacturing a tailgate 4: a jig is inserted through the pin holes 17 of the two connecting arms 10 to ensure their coaxiality. A jig is used to secure the door panel 16 and the two connecting arms 10, ensuring that the connecting arms 10 are in close contact with the left and right sides of the door panel 16. The spacing between the two connecting arms 10 is approximately 2 mm greater than the lengths of the upper crossbeam 11, the middle crossbeam 13, and the lower crossbeam 15. A double-sided fillet weld is then made at the junction of the connecting arms 10 and the door panel 16. Before welding, it is important to ensure that the jig is able to securely clamp the door panel 16 to prevent excessive deformation caused by welding.

[0051] Weld the pad 14 to the outside of the lower beam 15, and weld the inner support 31 to the inside of the lower beam 15, ensuring that the vertical ribs 33 and horizontal ribs 34 of the inner support 31 are aligned with the left and right sides and top of the pad 14, and then weld them into one piece.

[0052] Install the three cross beams between the two connecting arms 10, each close to the corresponding position of the door panel 16, first fix them by spot welding or segment welding, then remove the fixtures except the tooling shaft, and weld the upper cross beam 11, the middle cross beam 13, the lower cross beam 15 to the door panel 16 in turn, then slightly lift the upper and lower ends of the door panel 16 in turn to weld the three cross beam ends to the connecting arms 10, finally turn the tailgate 4 over once, and weld the first wall 20 of the upper cross beam to the back of the door panel 16.

[0053] In summary, the cargo box tailgate proposed in the present invention has a simple structure, requires less welding, is easy to manufacture, has high load-bearing capacity, has less stress concentration and welding stress, can adapt to the impact force and alternating stress during operation, reduces the occurrence of cracking, and improves production efficiency.

[0054] In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0055] Furthermore, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are also intended to fall within the scope of protection of the present invention and form different embodiments. For example, in the above embodiments, those skilled in the art will be able to use them in combination based on the known technical solutions and the technical problems to be solved by this application.

[0056] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with this patent can make slight changes or modifications to equivalent embodiments using the above-mentioned technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A cargo box tailgate, characterized in that: include: Door panel, in the non-unloading stage, the door panel is attached to the rear end of the cargo box to block the material; The connecting arms are symmetrically arranged at the left and right ends of the outer side of the door panel, with the lower end close to the lower edge of the door panel and the upper end extending beyond the upper edge of the door panel and hinged to the rear of the cargo box; The upper crossbeam is located between the two connecting arms and is close to the edge of the door panel; The middle cross member is located between the two connecting arms and is close to the middle area of ​​the door panel; The lower crossbeam is located between the two connecting arms and is close to the lower edge of the door panel; The height of the connecting arm gradually decreases from top to bottom, and the cross-sectional heights of the upper beam, middle beam, and lower beam decrease accordingly; The upper crossbeam is a bent part formed by three bends to form four plane walls, the first wall and the second wall wrap the upper edge of the door panel, and the first wall is welded to the inner side of the door panel; The plane of the third wall is parallel to the outer edge of the connecting arm, and the second wall and the fourth wall both form an obtuse angle with the third wall; The second wall is at a certain angle to the horizontal plane, and the edge of the fourth wall is welded close to the outer side of the door panel; The middle crossbeam is a bent part formed by two bends to form three sections of plane walls, the plane of the second wall is parallel to the outer edge of the connecting arm, the first wall and the third wall are both at an obtuse angle to the second wall, and the edges of the first wall and the third wall are welded tightly to the outer side of the door panel; The lower cross beam is a bent part formed by two bends into three sections of plane walls. The plane of the second wall is parallel to the outer edge of the connecting arm. The first wall and the third wall both form obtuse angles with the second wall. The edges of the first wall and the third wall are welded tightly against the outer side of the door panel.

2. The cargo box tailgate according to claim 1, characterized in that: The connecting arm is a 7-shaped arm plate as a whole, and the upper end of the connecting arm is provided with a bent ear, and a pin shaft hole is provided on the bent ear, which is connected to the upper hinge support along the side of the cargo box through the pin shaft so that the tailgate can rotate around the pin shaft.

3. The cargo box tailgate according to claim 1, characterized in that: Two symmetrically arranged pads are welded to the surface of the second wall of the lower cross beam, and the lower edge of the pads is close to the lower end of the second wall of the lower cross beam. In the non-unloading stage, the rear tail hook on the cargo box is always pressed on the pads to keep the rear tailgate in a locked and closed state.

4. The cargo box tailgate according to claim 3, characterized in that: Two symmetrically arranged inner supports are provided on the inner side of the lower crossbeam, and the inner supports are connected to the lower crossbeam by welding; the inner supports include vertical ribs, transverse rib 1, and transverse rib 2; The profile of the vertical ribs fits the inner cross section of the lower cross beam, and the two vertical ribs are aligned with the left and right sides of the pad respectively; A transverse reinforcement 1 is sandwiched between the two vertical reinforcements, and the transverse reinforcement 1 is aligned with the upper edge of the pad; One end of the two transverse reinforcements is respectively close to the outside of the two vertical reinforcements and aligned with the transverse reinforcement.

5. The cargo box tailgate according to claim 1, characterized in that: The door panel, connecting arm, upper crossbeam, middle crossbeam and lower crossbeam are connected by welding; The weld between the first wall of the upper crossbeam and the door panel is on the back side, and the remaining welds between the upper crossbeam, the connecting arm and the door panel are all on the front side; The welds between the middle cross beam, the connecting arm and the door panel are all on the front side; The welds between the lower cross beam, the connecting arm and the door panel are all on the front side; The welding seams between the connecting arms and the door panels are all on the front side.

6. The cargo box tailgate according to claim 1, characterized in that: Two symmetrically placed lifting ears are provided on the top of the upper crossbeam for lifting the rear tailgate.

7. A cargo box, characterized in that: include: A box body consisting of a front baffle, a bottom plate, and left and right side plates; Hinge support, symmetrically installed at the upper edge ends of the left and right side panels; The cargo box rear tailgate according to any one of claims 1 to 6 is connected to the hinge support via a pin and can rotate around the hinge support; The rear tail hook is installed at the tail of the box and can rotate around the tail of the box; A zipper, one end of which is connected to the frame beam and the other end is connected to the rear tail hook; During the non-unloading stage, the rear hook on the box body is always pressed against the pad on the tailgate by the zipper, so that the tailgate is in a locked and closed state; during the unloading stage, the box body is flipped up, the zipper is loosened, the rear hook is separated from the pad, so that the tailgate is in an unlocked state, the box body continues to flip up, and the tailgate rotates around the hinge support to open.

8. A dump truck, characterized in that: A cargo box rear tailgate according to any one of claims 1 to 6 is installed; or a cargo box according to claim 7 is installed.

9. A method for manufacturing a cargo box rear tailgate according to any one of claims 1 to 6, characterized in that: Use a tooling shaft to pass through the pin holes of the two connecting arms to ensure their coaxiality; Use fixtures to fix the door panel and two connecting arms, making sure the connecting arms are close to the left and right sides of the door panel. Ensure that the distance between the two connecting arms is larger than the three crossbeams. Then weld double-sided fillet welds at the junction of the connecting arms and the door panel. Before welding, make sure that the fixtures can always fix and clamp the door panel to prevent excessive deformation caused by welding. Weld the pad to the outside of the lower beam, and weld the inner support to the inside of the lower beam, ensuring that the vertical and horizontal ribs of the inner support are aligned with the left and right sides and top of the pad, and then weld them together; Install the three crossbeams between the two connecting arms, with each of them close to the corresponding position of the door panel. First, fix them by spot welding or segment welding, then remove the fixtures except the tooling shaft, and weld the upper crossbeam, middle crossbeam, lower crossbeam and door panel in turn. Then, slightly lift the upper and lower ends of the door panel in turn to weld the ends of the three crossbeams to the connecting arms. Finally, flip the tailgate over once and weld the first wall of the upper crossbeam to the back of the door panel.

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