CN116176710A - Cargo box back tail door, cargo box, dump truck and manufacturing method - Google Patents

Abstract

The invention discloses a cargo box back door, a cargo box, a dump truck and a manufacturing method. The left and right ends of the outer side surface of the door plate are respectively provided with a connecting arm. The connecting arm is a 7-shaped arm plate, the lower end of the connecting arm is close to the lower edge of the door plate, and the upper end of the connecting arm exceeds the upper edge of the door plate by one section. An upper beam, a middle beam and a lower beam are clamped between the two connecting arms, the upper beam is tightly attached to the upper edge of the door plate, the middle beam is tightly attached to the middle area of the door plate, and the lower beam is tightly attached to the lower edge of the door plate. The height of the connecting arm is gradually reduced from top to bottom, and the heights of the sections of the upper cross beam, the middle cross beam and the lower cross beam are correspondingly and sequentially reduced. The upper end of the connecting arm is hinged with the tail of the container so that the back tail door rotates relative to the container. The back door disclosed by the invention has the advantages of simple structure, small welding amount, easiness in manufacturing, high bearing capacity, small stress concentration and welding stress, capability of adapting to impact force and alternating stress in the operation process, reduction of cracking and improvement of production efficiency.

Description

Cargo box back tail door, cargo box, dump truck and manufacturing method

Technical Field

The invention relates to a cargo box back tail gate, and belongs to the technical field of dumpers.

Background

The container is used as a working tool of the dump truck, and can be used for transferring and transporting materials. Materials that may be transported include soil, rock, concrete, or any other bulk material or mixture of materials. After the material is loaded, the material must be placed in the dump truck container during its transportation. During transport, the back door of the container is used to hold material behind the container and prevent spillage from the rear side. In the unloading process, the back tail hook is opened, and along with the lifting of the container, the back tail door and the container are opened to dump materials. When loading materials, the falling process of the materials can impact the door plate of the back door. The back door is subject to the weight of the material during transport uphill. The existing back door structure is generally a field welding structure, and one surface of the back door structure is provided with dense and numerous transverse and vertical channel steel and reinforcing plates. The back door has the advantages of complex structure, large welding quantity, repeated overturning and deflection, difficult manufacture and long production period in the welding process, and the existing back door has a large amount of stress concentration and welding stress due to compact staggered connection of the structure, is easy to cause fatigue cracking due to impact force and alternating stress in actual operation, and is frequently welded and repaired, so that the production efficiency is affected. The hinge seat of the back door is also a splicing structure of a plurality of plates, so that the back door is easy to break in the use process, and the back door falls off.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides the rear door of the cargo box, which has the advantages of simple structure, less welding quantity, easiness in manufacturing, high bearing capacity, less stress concentration and welding stress, capability of adapting to impact force and alternating stress in the operation process, reduction of cracking and improvement of production efficiency.

In order to achieve the above purpose, the technical scheme provided by the invention is as follows:

the first aspect of the present invention discloses a cargo box back door comprising:

the door plate is attached to the tail end of the container in a non-unloading stage to block materials;

the connecting arms are symmetrically arranged at the left end and the right end of the outer side surface of the door plate, the lower end of the connecting arms is close to the lower edge of the door plate, and the upper end of the connecting arms extends beyond the upper edge of the door plate and is hinged with the tail part of the container;

the upper cross beam is positioned between the two connecting arms and is clung to the upper edge of the door plate;

the middle cross beam is positioned between the two connecting arms and is clung to the middle area of the door plate;

the lower cross beam is positioned between the two connecting arms and is clung to the lower edge of the door plate;

the height of the connecting arm is gradually reduced from top to bottom, and the section heights of the upper cross beam, the middle cross beam and the lower cross beam are correspondingly and sequentially reduced.

In some embodiments, the connecting arm is a 7-shaped arm plate integrally, the upper end of the connecting arm is provided with a section of bent lug, the bent lug is provided with a pin shaft hole, and the pin shaft is connected with the container side edge upper hinge support seat through a pin shaft so as to enable the back door to rotate around the pin shaft.

In some embodiments, the upper beam is a bending piece which is bent three times to form four sections of plane walls, the first wall and the second wall wrap the upper edge of the door plate, and the first wall is welded on the inner side surface of the door plate; the third wall plane is parallel to the outer edge of the connecting arm, and the second wall and the fourth wall form an obtuse angle with the third wall; the second wall forms a certain angle with the horizontal surface, and the edge of the fourth wall is tightly welded with the outer side surface of the door plate.

In some embodiments, the middle cross beam is a bending piece which is bent 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 form an obtuse angle with the second wall, and the edges of the first wall and the third wall are welded close to the outer side face of the door plate.

In some embodiments, the lower beam is a bent piece with three sections of plane walls formed by two bends, the plane of the second wall is parallel to the outer edge of the connecting arm, the first wall and the third wall form an obtuse angle with the second wall, and the edges of the first wall and the third wall are welded close to the outer side face of the door plate.

In some embodiments, the second wall surface of the lower cross member is welded with two symmetrically arranged tie plates, the lower edge of the tie plates is close to the lower end of the second wall of the lower cross member, and the back hooks on the cargo box are always pressed on the tie plates in the non-unloading stage, so that the back door is in a locking and closing state.

In some embodiments, two symmetrically arranged inner supports are arranged on the inner side of the lower beam, and the inner supports are connected with the lower beam through welding; the inner support comprises a vertical rib, a transverse rib I and a transverse rib II; the profile of the vertical ribs is attached to the inner section of the lower cross beam, and the two vertical ribs are respectively aligned with the left side and the right side of the backing plate; the inner sides of the two vertical ribs are clamped with a transverse rib I, and the transverse rib I is aligned with the upper edge of the backing plate; one end of the second transverse rib is respectively clung to the outer sides of the two vertical ribs and is aligned with the first transverse rib.

In some embodiments, the door plate, the connecting arm, the upper beam, the middle beam and the lower beam are in welded connection; the welding lines of the first wall of the upper cross beam and the door plate are arranged on the back side, and the upper cross beam, the connecting arm and the other welding lines of the door plate are arranged on the front side; the welding seams among the middle cross beam, the connecting arm and the door plate are all on the front side; the welding lines among the lower cross beam, the connecting arm and the door plate are all on the front side; the welding seams between the connecting arms and the door plate are all on the front side.

In some embodiments, two lifting lugs which are symmetrically placed are arranged at the top of the upper cross beam and are used for lifting the back door.

In a second aspect, the invention discloses a cargo box comprising:

the box body consists of a front baffle, a bottom plate, a left side plate and a right side plate;

the hinge supports are symmetrically arranged at the tail ends of the upper edges of the left side plate and the right side plate;

the rear tail door of the cargo box is connected with the hinged support through a pin roll and can rotate around the hinged support;

the back tail hook is arranged at the tail part of the box body and can rotate around the tail part of the box body;

one end of the zipper is connected with the frame girder, and the other end of the zipper is connected with the back tail hook;

in the non-unloading stage, the back tail hook on the box body is always pressed on the backing plate on the back tail door under the action of the zipper, so that the back tail door is in a locking and closing state; and in the unloading stage, the box body is turned up, the zipper is loosened, and the back tail hook is separated from the base plate, so that the back tail door is in an unlocked state, the box body is continuously turned up, and the back tail door is opened by rotating around the hinged support.

The third aspect of the invention discloses a dump truck, which is provided with the cargo box back tail door; alternatively, the container described above is installed.

The fourth aspect of the invention discloses a method for manufacturing a cargo box back door, comprising the steps of:

the tooling shaft penetrates through the pin shaft holes of the two connecting arms so as to ensure coaxiality of the two connecting arms;

the door plate and the two connecting arms are fixed by using the fixture, the connecting arms are clung to the left side and the right side of the door plate, the gap between the two connecting arms is ensured to be larger than that between the three cross beams, then double-sided fillet welds are welded at the joint of the connecting arms and the door plate, and the fixture is ensured to be capable of fixedly clamping the door plate all the time before welding, so that excessive deformation caused by welding is prevented;

the backing plate is spliced and welded to the outer side of the lower cross beam, the inner support splicing points are arranged on the inner side of the lower cross beam, the vertical ribs and the transverse ribs of the inner support are respectively aligned with the left side edge, the right side edge and the upper side edge of the backing plate, and then the backing plate and the transverse ribs are welded into a whole;

and installing the three cross beams between the two connecting arms, respectively clinging to the corresponding positions of the door plates, performing spot welding or section welding for fixation, then removing tool clamps outside the tool shafts, sequentially performing welded joint connection of the upper cross beam, the middle cross beam and the lower cross beam with the door plates, sequentially slightly lifting the upper end and the lower end of the door plates to perform welding between the end parts of the three cross beams and the connecting arms, and finally turning the back door once to perform welding between the first wall of the upper cross beam and the back surface of the door plates.

Based on the application of the technical scheme, the invention has the following beneficial effects compared with the prior art:

the invention provides a cargo box back door which has the advantages of simple structure, less welding quantity, easiness in manufacturing, high bearing capacity, less stress concentration and welding stress, capability of adapting to impact force and alternating stress in the operation process, reduction of cracking and improvement of production efficiency.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. It is evident that the drawings in the following description are only examples, from which other drawings can be obtained by a person skilled in the art without the inventive effort.

In the drawings:

FIG. 1 is a block diagram of a cargo box with a back door according to the present invention;

FIG. 2 is a view of the back door of the cargo box of the present invention;

FIG. 3 is a cross-sectional view of the rear end door of the cargo box of the present invention;

fig. 4 is a view showing the construction of the inner support structure on the lower beam according to the present invention.

Reference numerals illustrate: 1. a cargo box; 2. a hinged support; 3. a pin shaft; 4. a back tail gate; 5. a back tail hook; 6. a zipper; 10. a connecting arm; 11. an upper cross beam; 12. lifting lugs; 13. a middle cross beam; 14. a backing plate; 15. a lower cross beam; 16. a door panel; 17. a pin shaft hole; 20. a first wall; 21. a second wall; 22. a third wall; 23. a fourth wall; 24. a first wall; 25. a second wall; 26. a third wall; 27. a first wall; 28. a second wall; 29. a third wall; 31. an inner support; 32. transverse ribs II; 33. a vertical rib; 34. and a transverse rib I.

It should be noted that these drawings and the written description are not intended to limit the scope of the inventive concept in any way, but to illustrate the inventive concept to those skilled in the art by referring to the specific embodiments.

Description of the embodiments

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention, and the following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

As shown in fig. 1-2, the tail of the cargo box 1 is provided with a back door 4. The back door 4 is connected with the hinged support 2 through a pin shaft 3 and can rotate around the hinged support 2. The hinge support 2 rotates about the container via a pin 3. The two hinge supports 2 are respectively positioned at the left side edge and the right side edge of the container 1, and have the effects of adjusting assembly errors and buffering. The lower end of the zipper 6 is connected with the frame girder, and the other section is connected with the back tail hook 5. The back tail hook 5 is hinged with the container 1 and can rotate around the tail of the container 1. In the non-unloading stage, the back hook 5 on the container 1 is acted by the zipper 6 and is always pressed on the backing plate 14, so that the back door 4 is in a locked and closed state. In the unloading stage, the container 1 is turned up, the zipper 6 is loosened, and the back hook 5 is separated from the backing plate 14, so that the back door 4 is in an unlocked state. The container 1 continues to turn up and the back door 4 is pivoted open about the hinge support 2.

The back door 4 includes a door panel 16, a connecting arm 10, an upper cross member 11, a middle cross member 13, and a lower cross member 15. The door panel 16 is a square plate, and in the non-unloading stage, the door panel 16 is attached to the tail end of the container 1 to block materials. The left and right ends of the outer side surface of the door panel 16 are respectively provided with a connecting arm 10 and are symmetrically arranged. The connecting arm 10 is a 7-shaped arm plate, the lower end of the connecting arm is close to the lower edge of the door plate 16, and the upper end of the connecting arm exceeds the upper edge of the door plate 16 by a section. An upper beam 11, a middle beam 13 and a lower beam 15 are clamped between the two connecting arms 10, the upper beam 11 is abutted against the upper edge of the door plate 16, the middle beam 13 is abutted against the middle area of the door plate 16, and the lower beam 15 is abutted against the lower edge of the door plate 16. The height of the connecting arm 10 is gradually reduced from top to bottom, and the section heights of the upper beam 11, the middle beam 13 and the lower beam 15 are correspondingly reduced in sequence. The door plate 16, the connecting arm 10, the upper beam 11, the middle beam 13 and the lower beam 15 are in welded connection. The upper end of the connecting arm 10 is provided with a section of bent lug, the bent lug is provided with a pin shaft hole 17, and the bent lug is connected with the side edge upper hinge support 2 of the container 1 through a pin shaft 3 so as to enable the back door 4 to rotate around the pin shaft 3, thereby realizing the opening and closing of the back door 4 relative to the container 1. Two lifting lugs 12 which are symmetrically placed are further arranged at the top of the upper cross beam 11 and used for lifting the back door 4, and the back door 4 is convenient to install and detach.

As shown in fig. 3, the upper beam 11 is a bending piece formed by bending three times to form four sections of plane walls, the upper edge of the door plate 16 is wrapped by the first wall 20 and the second wall 21, and the first wall 20 is welded on the inner side surface of the door plate 16, so that the upper edge of the door plate 16 and the connecting weld seam can be prevented from being broken by falling rocks. The plane of the third wall 22 is parallel to the outer edge of the connecting arm 10, and the second wall 21 and the fourth wall 23 form an obtuse angle with the third wall 22. The second wall 21 is at an angle to the horizontal to prevent material from accumulating so as to be spilled during transport. The edge of the fourth wall 23 is welded against the outer side of the door panel 16. The middle cross beam 13 is a bending piece which is formed by bending two parts to form three sections of plane walls, the plane of the second wall 25 is parallel to the outer side of the connecting arm 10, the first wall 24 and the third wall 26 form an obtuse angle with the second wall 25, and the edges of the first wall 24 and the third wall 26 are welded tightly to the outer side face of the door plate 16. The lower beam 15 is a bending piece which is formed by bending two parts to form three sections of plane walls, the plane of the second wall 28 is parallel to the outer side of the connecting arm 10, the first wall 27 and the third wall 29 form an obtuse angle with the second wall 28, and the edges of the first wall 27 and the third wall 29 are welded tightly to the outer side surface of the door plate 16. Only the welding seam between the first wall 20 of the upper beam and the door plate 16 is on the back side, and the welding seams between the three beams and the connecting arm 10, and the other welding seams between the connecting arm 10 and the door plate 16 are all on the front side, so that the welding forming can be performed on the same side, and the turnover times in the welding process can be reduced. Two symmetrically arranged backing plates 14 are welded on the surface of the second wall 28 of the lower cross beam 15, the backing plates 14 are rectangular, and the lower edge of each backing plate 14 is close to the lower end of the second wall 28 of the lower cross beam 15. In the non-unloading stage, the back hook 5 on the container is acted by the zipper 6 and always pressed on the pad 14, so that the back door 4 is in a locked and closed state.

As shown in fig. 4, two inner supports 31 are symmetrically arranged on the inner side of the lower beam 15, and the inner supports 15 comprise a vertical rib 33, a transverse rib one 34 and a transverse rib two 32. The ribs 33 are contoured to fit the inner cross-section of the lower cross-beam 15, with the two ribs 33 aligned with the left and right sides of the pad 14, respectively. The inner sides of the two studs 33 are clamped with a first transverse rib 34, and the first transverse rib 34 is aligned with the upper edge of the backing plate 14. One end of each of the two transverse ribs 32 is respectively clung to the outer sides of the two vertical ribs 33 and is aligned with the transverse rib 34. The inner support 31 is connected with the lower beam 15 by welding, and improves the strength of the lower beam 15.

The invention also provides a manufacturing method of the back door 4, which comprises the following steps: the tooling shaft is used to penetrate through the pin shaft holes 17 of the two connecting arms 10 so as to ensure the coaxiality of the two connecting arms. The door plate 16 and the two connecting arms 10 are fixed by using the fixture, the connecting arms 10 are tightly attached to the left side and the right side of the door plate 16, the gap between the two connecting arms 10 is ensured to be about 2mm larger than the lengths of the upper beam 11, the middle beam 13 and the lower beam 15, then double-sided fillet welds are welded at the joint of the connecting arms 10 and the door plate 16, the fixture is ensured to be fixedly clamped on the door plate 16 all the time before welding, and excessive deformation caused by welding is prevented.

The backing plate 14 is splice welded to the outer side of the lower beam 11, the inner support 31 is splice-welded to the inner side of the lower beam 15, the vertical ribs 33 and the first transverse ribs 34 of the inner support 15 are respectively aligned with the left side and the right side and the upper side of the backing plate 14, and then welded into a whole.

The three beams are arranged between the two connecting arms 10 and are respectively clung to the corresponding positions of the door plate 16, spot welding or section welding is firstly carried out for fixing, then a fixture except a fixture shaft is removed, welding joints of the upper beam 11, the middle beam 13 and the lower beam 15 and the door plate 16 are sequentially carried out, then the upper end and the lower end of the door plate 16 are sequentially and slightly lifted for welding the ends of the three beams and the connecting arms 10, finally the back door 4 is turned over once, and the welding of the first wall 20 of the upper beam and the back surface of the door plate 16 is carried out.

In summary, the cargo box back door provided by the invention has the advantages of simple structure, less welding quantity, easiness in manufacturing, high bearing capacity, stress concentration and less welding stress, can adapt to impact force and alternating stress in the operation process, reduces cracking and improves the production efficiency.

In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features contained in other embodiments, but not others, combinations of features of different embodiments are equally meant to be within the scope of the invention and form different embodiments. For example, in the above embodiments, those skilled in the art can use the above embodiments in combination according to known technical solutions and technical problems to be solved by the present application.

The foregoing description is only illustrative of the preferred embodiment of the present invention, and is not to be construed as limiting the invention, but is to be construed as limiting the invention to any simple modification, equivalent variation and variation of the above embodiments according to the technical matter of the present invention without departing from the scope of the invention.

Claims (12)

1. A cargo box back door comprising:

the door plate is attached to the tail end of the container in a non-unloading stage to block materials;

the connecting arms are symmetrically arranged at the left end and the right end of the outer side surface of the door plate, the lower end of the connecting arms is close to the lower edge of the door plate, and the upper end of the connecting arms extends beyond the upper edge of the door plate and is hinged with the tail part of the container;

the upper cross beam is positioned between the two connecting arms and is clung to the upper edge of the door plate;

the middle cross beam is positioned between the two connecting arms and is clung to the middle area of the door plate;

the lower cross beam is positioned between the two connecting arms and is clung to the lower edge of the door plate;

the height of the connecting arm is gradually reduced from top to bottom, and the section heights of the upper cross beam, the middle cross beam and the lower cross beam are correspondingly and sequentially reduced.

2. A cargo box back door as defined by claim 1 wherein:

the connecting arm is integrally a 7-shaped arm plate, the upper end of the connecting arm is provided with a section of bent lug, the bent lug is provided with a pin shaft hole, and the bent lug is connected with the upper hinge support of the side edge of the container through a pin shaft so that the back door rotates around the pin shaft.

3. A cargo box back door as defined by claim 1 wherein:

the upper beam is a bending piece which is bent by three times to form four sections of plane walls, the upper edge of the door plate is wrapped by the first wall and the second wall, and the first wall is welded on the inner side surface of the door plate;

the third wall plane is parallel to the outer edge of the connecting arm, and the second wall and the fourth wall form an obtuse angle with the third wall;

the second wall forms a certain angle with the horizontal surface, and the edge of the fourth wall is tightly welded with the outer side surface of the door plate.

4. A cargo box back door as defined by claim 1 wherein:

the middle cross beam is a bending piece which is formed by bending two parts 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 form an obtuse angle with the second wall, and the edges of the first wall and the third wall are tightly welded to the outer side face of the door plate.

5. A cargo box back door as defined by claim 1 wherein:

the lower beam is a bending piece for forming three sections of plane walls by two bending steps, the plane of the second wall is parallel to the outer edge of the connecting arm, the first wall and the third wall form an obtuse angle with the second wall, and the edges of the first wall and the third wall are welded tightly to the outer side face of the door plate.

6. A cargo box back door as defined by claim 5 wherein:

two symmetrically arranged backing plates are welded on the second wall surface of the lower cross beam, the lower edge of each backing plate is close to the lower end of the second wall of the lower cross beam, and in the non-unloading stage, the back tail hooks on the container are always pressed on the backing plates, so that the back tail doors are in a locking and closing state.

7. A cargo box back door as defined by claim 6 wherein:

two symmetrically arranged inner supports are arranged on the inner side of the lower cross beam and are connected with the lower cross beam through welding; the inner support comprises a vertical rib, a transverse rib I and a transverse rib II;

the profile of the vertical ribs is attached to the inner section of the lower cross beam, and the two vertical ribs are respectively aligned with the left side and the right side of the backing plate;

the inner sides of the two vertical ribs are clamped with a transverse rib I, and the transverse rib I is aligned with the upper edge of the backing plate;

one end of the second transverse rib is respectively clung to the outer sides of the two vertical ribs and is aligned with the first transverse rib.

8. A cargo box back door as defined by claim 1 wherein:

the door plate, the connecting arm, the upper beam, the middle beam and the lower beam are in welded connection;

the welding lines of the first wall of the upper cross beam and the door plate are arranged on the back side, and the upper cross beam, the connecting arm and the other welding lines of the door plate are arranged on the front side;

the welding seams among the middle cross beam, the connecting arm and the door plate are all on the front side;

the welding lines among the lower cross beam, the connecting arm and the door plate are all on the front side;

the welding seams between the connecting arms and the door plate are all on the front side.

9. A cargo box back door as defined by claim 1 wherein:

two lifting lugs which are symmetrically placed are arranged at the top of the upper cross beam and are used for lifting the back door.

10. A cargo box, comprising:

the box body consists of a front baffle, a bottom plate, a left side plate and a right side plate;

the hinge supports are symmetrically arranged at the tail ends of the upper edges of the left side plate and the right side plate;

a cargo box back door as claimed in any one of claims 1 to 9 connected to the hinge support by a pin, and rotatable about the hinge support;

the back tail hook is arranged at the tail part of the box body and can rotate around the tail part of the box body;

one end of the zipper is connected with the frame girder, and the other end of the zipper is connected with the back tail hook;

in the non-unloading stage, the back tail hook on the box body is always pressed on the backing plate on the back tail door under the action of the zipper, so that the back tail door is in a locking and closing state; and in the unloading stage, the box body is turned up, the zipper is loosened, and the back tail hook is separated from the base plate, so that the back tail door is in an unlocked state, the box body is continuously turned up, and the back tail door is opened by rotating around the hinged support.

11. A dump truck, characterized in that:

a cargo box back door having any one of claims 1 to 9 mounted thereto; alternatively, a container according to claim 10 is installed.

12. A manufacturing method of a cargo box back tail gate is characterized by comprising the following steps:

the tooling shaft penetrates through the pin shaft holes of the two connecting arms so as to ensure coaxiality of the two connecting arms;

the door plate and the two connecting arms are fixed by using the fixture, the connecting arms are clung to the left side and the right side of the door plate, the gap between the two connecting arms is ensured to be larger than that between the three cross beams, then double-sided fillet welds are welded at the joint of the connecting arms and the door plate, and the fixture is ensured to be capable of fixedly clamping the door plate all the time before welding, so that excessive deformation caused by welding is prevented;

the backing plate is spliced and welded to the outer side of the lower cross beam, the inner support splicing points are arranged on the inner side of the lower cross beam, the vertical ribs and the transverse ribs of the inner support are respectively aligned with the left side edge, the right side edge and the upper side edge of the backing plate, and then the backing plate and the transverse ribs are welded into a whole;

and installing the three cross beams between the two connecting arms, respectively clinging to the corresponding positions of the door plates, performing spot welding or section welding for fixation, then removing tool clamps outside the tool shafts, sequentially performing welded joint connection of the upper cross beam, the middle cross beam and the lower cross beam with the door plates, sequentially slightly lifting the upper end and the lower end of the door plates to perform welding between the end parts of the three cross beams and the connecting arms, and finally turning the back door once to perform welding between the first wall of the upper cross beam and the back surface of the door plates.

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