Gas tank of common-tank ring main unit

Abstract

The invention relates to a common box ring main unit gas box which comprises a gas box folded plate, two side plates, a gas box top sealing plate and a gas box rear sealing plate, and is characterized in that the gas box top sealing plate and the gas box rear sealing plate are each provided with at least one hook row, at least one middle partition plate is arranged in a gas box body, the upper portion of each middle partition plate is provided with an upper bent structure, and the lower portion of each middle partition plate is provided with a lower bent structure. The upper bending structure is provided with a through hole row which corresponds to and is matched and connected with a hook row on the top sealing plate of the gas tank, so that the middle partition plate and the top sealing plate of the gas tank form positioning assembly, the rear part of the middle partition plate is provided with a rear bending structure, and the rear bending structure is provided with a through hole row which corresponds to and is matched and connected with a hook row on a rear sealing plate of the gas tank. The peripheries of the gas tank top sealing plate and the gas tank rear sealing plate are fully welded and then are welded with the gas tank folded plate and the two side plates into a whole. The air box is high in structural strength, and the problems of deformation and low assembly efficiency of the air box can be effectively solved.

Description

Technical Field

[0001] The present invention relates to an air box, and more particularly to an air box for a common box ring main unit. Background Art

[0002] Among most switchgears on the market currently, ring main units account for a large proportion. The ring main unit is filled with insulating gas in its air box, which can increase the insulation of the switch, thereby reducing the size of the switch. Designing the air box of the ring main unit into a common box structure can reduce the usage amount of bushings and the stainless steel sheet metal of the air box, thus reducing costs. Currently, due to its too large volume, the air box of the common box ring main unit will deform under the action of internal air pressure, so such an air box of the common box ring main unit needs to adopt the method of reinforcing ribs and air box tie rods to reduce the deformation of the air box and enhance the strength structure of the air box.

[0003] However, strengthening the air box by using reinforcing ribs and air box tie rods will increase the welding workload, and the welding work is far less efficient than the assembly work. Moreover, whether the air box cover plate is welded to the air box tie rod or installed by bolts, holes need to be opened on the cover plate, which increases the air leakage points of the air box, thereby increasing the air leakage risk of the air box. If the insulating gas leaks, it will directly affect the insulation performance of the switch and the reliability of the ring main unit and the switchgear. At the same time, there will be weld scars on the rear cover plate and the top cover plate of the air box, affecting the overall external aesthetics of the ring main unit. Summary of the Invention

[0004] The purpose of the present invention is to provide an air box for a common box ring main unit to realize the assembly of the partition board and the reinforcing ribs in the air box of the common box ring main unit, improve the structural strength of the air box, reduce the air leakage risk of the air box, thereby improving the reliability of the common box ring main unit, and overcoming the defects of low production efficiency and air leakage risk caused by the internal tie rod welding method in the air box of the common box ring main unit in the prior art.

[0005] To achieve the above purpose, the technical solution of the present invention is: an air box for a common box ring main unit, including an air box body, the air box body is enclosed by an air box folding plate, two side plates, an air box top cover plate and an air box rear cover plate, and the air box body is filled with insulating gas. The innovation lies in:

[0006] At least one hook row is provided on both the air box top cover plate and the air box rear cover plate, and the hook row includes a plurality of hooks.

[0007] At least one middle partition board is provided inside the air box body.

[0008] An upper bending structure is provided at the upper part of the middle partition board, and a through hole row corresponding to and cooperatively connected with the hook row on the air box top cover plate is provided on the upper bending structure. The hooks on the air box top cover plate are inserted into the corresponding through holes on the upper bending structure and then hook the middle partition board, so that the middle partition board and the air box top cover plate form a positioning assembly.

[0009] The rear part of the middle partition board is provided with a rear bending structure, and a through-hole column corresponding to and cooperatively connected with the hook column on the rear sealing plate of the air box is arranged on the rear bending structure. The hook on the rear sealing plate of the air box is inserted into the corresponding through-hole on the rear bending structure and then hooks the middle partition board, so that the middle partition board and the rear sealing plate of the air box form a positioning assembly.

[0010] After the top sealing plate and the rear sealing plate of the air box and the middle partition board form a positioning assembly, they are then fully welded around the top sealing plate and the rear sealing plate of the air box and welded into one body with the air box folding plate and the two side plates.

[0011] In the above technical solution, the front part of the middle partition board is provided with a front bending structure, and a circular through-hole column is arranged on the front bending structure, and the middle partition board is fixed to the air box folding plate through a pressing plate and a locknut.

[0012] In the above technical solution, a switch fixing unit for installing a switch is further provided on the air box body. The switch fixing unit includes a support plate and a rolling pin group. The front part of the switch is installed on the air box folding plate, and the rear part of the switch is installed on the support plate. At the same time, rolling pin groups are provided on the inner walls of the two side plates and on the middle partition board. Guide rail grooves are provided at both ends of the support plate, and the guide rail grooves at both ends of the support plate are cooperatively connected with the rolling pin groups on the middle partition board and the corresponding side plates.

[0013] In the above technical solution, the rolling pin group includes pins fixed on the middle partition board or the side plates. Rollers are sleeved on the pins. At the same time, lock caps for limiting the rollers are further provided at both ends of the pins.

[0014] In the above technical solution, a racetrack-shaped through-hole column is arranged on the upper bending structure. After the hook on the top sealing plate of the air box is inserted into the racetrack-shaped through-hole and slides forward to hook the middle partition board, a middle partition board limiting protrusion in a convex shape provided on the middle partition board abuts against the bending part of the top sealing plate of the air box. After limiting the top sealing plate of the air box, the middle partition board and the top sealing plate of the air box form a positioning assembly.

[0015] A racetrack-shaped through-hole column is arranged on the rear bending structure. The hook on the rear sealing plate of the air box is inserted into the racetrack-shaped through-hole and slides downward to hook the middle partition board. After the rear sealing plate of the air box abuts against the air box folding plate, the middle partition board and the rear sealing plate of the air box form a positioning assembly.

[0016] In the above technical solution, a U-shaped reinforcing rib for increasing its own strength is provided on the air box folding plate. The U-shaped reinforcing rib is fixed to the air box folding plate through an internal buckling method using a T-shaped nut through a welding stud.

[0017] On the upper surface of the bottom of the air box folding plate, a plurality of desiccant brackets for bundling desiccants are welded.

[0018] In the above technical solution, a plurality of runway-shaped reinforcing ribs formed by stamping are provided on the two side plates.

[0019] In the above technical solution, a plurality of support blocks are welded on the two side plates, and corresponding nuts are welded on each support block for fixing the air box body on the tooling.

[0020] In the above technical solution, marks for positioning are provided on the top sealing plate and the rear sealing plate of the air box when welding the hanging hooks.

[0021] The middle partition plate has a cross-shaped hollow design for reducing its own weight and making it lightweight.

[0022] The upper part of the air box folding plate has an upper bending part for enhancing strength.

[0023] Lifting rings for facilitating the overall lifting are provided at the tops of the two side plates.

[0024] The positive effect of the present invention is that after adopting the air box of the coaxial ring main switchgear of the present invention, since at least one hook row is provided on both the top sealing plate and the rear sealing plate of the air box of the present invention, and the hook row includes a plurality of hooks.

[0025] At least one middle partition plate is arranged inside the air box body.

[0026] An upper bending structure is provided on the upper part of the middle partition plate, and a through hole row corresponding to and cooperatively connected with the hook row on the top sealing plate of the air box is arranged on the upper bending structure. The hooks on the top sealing plate of the air box are inserted into the corresponding through holes on the upper bending structure and then hook the middle partition plate, so that the middle partition plate and the top sealing plate of the air box form a positioning assembly.

[0027] A rear bending structure is provided at the rear part of the middle partition plate, and a through hole row corresponding to and cooperatively connected with the hook row on the rear sealing plate of the air box is arranged on the rear bending structure. The hooks on the rear sealing plate of the air box are inserted into the corresponding through holes on the rear bending structure and then hook the middle partition plate, so that the middle partition plate and the rear sealing plate of the air box form a positioning assembly.

[0028] After the top sealing plate and the rear sealing plate of the air box and the middle partition plate form a positioning assembly, the top sealing plate and the rear sealing plate of the air box are fully welded around and then welded together with the air box folding plate and the two side plates.

[0029] It can be seen that the present invention enables the assembly constraints of the rear sealing plate welded part, the top sealing plate welded part, the air box folding plate and the middle partition plate of the air box through the hook-type structure, so that the entire air box is connected into a whole. The deformation of the air box under the action of the gas pressure from the inside to the outside is reduced, and the strength is increased. At the same time, this assembly form of the middle partition plate of the air box can reduce the welding workload, improve the production efficiency of the air box, and can also solve the problem that the rear sealing plate of the air box needs to be opened for connection with the air box tie rod, thereby increasing the air leakage risk.

[0030] In summary, for the gas tank of the coaxial ring main unit of the present invention, while taking into account the advantage of low cost of the gas tank of the coaxial ring main unit, the method of welding the gas tank sealing plate to the gas tank tie rod by opening holes in the gas tank sealing plate, which is commonly used in the coaxial ring main unit, is changed to the method of installing the gas tank sealing plate in the middle partition of the gas tank by means of hooks and assembly. At this time, the sealing plate does not need to be opened with holes, and the air leakage points are reduced, thereby ensuring airtightness and reliability. In addition, the assembly method has higher efficiency than the welding method, thereby reducing the production cost of the switch. Using the middle partition of the gas tank to replace the gas tank tie rod can also strengthen the structure of the top sealing plate of the gas tank, making the structural strength of the gas tank of the present invention higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic perspective view of a specific embodiment of the present invention;

[0032] Figure 2 is Figure 1 a schematic perspective view of removing the rear sealing plate of the gas tank in ;

[0033] Figure 3 is Figure 2 a schematic perspective view of removing the top sealing plate of the gas tank in ;

[0034] Figure 4 is a schematic view of the switch fixing unit of the present invention;

[0035] Figure 5 is a schematic view of the installation process of the top sealing plate of the gas tank of the present invention;

[0036] Figure 6 is a partial enlarged view of 5;

[0037] Figure 7 is a schematic view of the installation process of the rear sealing plate of the gas tank of the present invention;

[0038] Figure 8 is Figure 7 a partial enlarged view of ;

[0039] Figure 9 is a schematic view of the top sealing plate of the gas tank of the present invention;

[0040] Figure 10 is a schematic view of the rear sealing plate of the gas tank of the present invention;

[0041] Figure 11 is a schematic view of the side plate of the present invention;

[0042] Figure 12 is a schematic view of the middle partition of the present invention;

[0043] In the figure: 1 - air box folding plate, 11 - U-shaped reinforcing rib, 12 - T-shaped nut, 13 - welding stud, 14 - desiccant bracket, 15 - upper bending part, 2 - side plate, 21 - racetrack-shaped reinforcing rib, 22 - support block, 23 - nut, 3 - air box top sealing plate, 31 - bending part, 4 - air box rear sealing plate, 5 - middle partition plate, 51 - upper bending structure, 52 - rear bending structure, 53 - front bending structure, 54 - pressing plate, 55 - locknut, 56 - middle partition plate limiting projection, 57 - racetrack-shaped through hole, 58 - bending structure, 59 - limiting projection, 6 - hook, 61 - identifier, 71 - support plate, 711 - guide rail groove, 72 - rolling pin group, 721 - pin, 722 - roller, 723 - lock cap. Detailed implementation manners

[0044] The present invention will be further described below in conjunction with the accompanying drawings and the given embodiments, but is not limited thereto.

[0045] As Figures 1 - 12 shown, a gas box of a coaxial ring main unit includes a gas box body, the gas box body is surrounded by an air box folding plate 1, two side plates 2, an air box top sealing plate 3 and an air box rear sealing plate 4, and the gas box body is filled with insulating gas.

[0046] At least one hook row is arranged on both the air box top sealing plate 3 and the air box rear sealing plate 4, the hook row includes a plurality of hooks 6, and the hooks are reliably connected to the air box top sealing plate 3 and the air box rear sealing plate 4 by welding.

[0047] At least one middle partition plate 5 is arranged inside the gas box body.

[0048] An upper bending structure 51 is arranged on the upper part of the middle partition plate 5, and a through hole row corresponding to and cooperatively connected with the hook row on the air box top sealing plate 3 is arranged on the upper bending structure 51. The hook 6 on the air box top sealing plate 3 is inserted into the corresponding through hole on the upper bending structure 51 and then hooks the middle partition plate, so that the middle partition plate 5 and the air box top sealing plate 3 form a positioning assembly.

[0049] A rear bending structure 52 is arranged at the rear of the middle partition plate 5, and a through hole row corresponding to and cooperatively connected with the hook row on the air box rear sealing plate 4 is arranged on the rear bending structure 52. The hook 6 on the air box rear sealing plate 4 is inserted into the corresponding through hole on the rear bending structure 52 and then hooks the middle partition plate, so that the middle partition plate 5 and the air box rear sealing plate 4 form a positioning assembly.

[0050] After the air box top sealing plate 3 and the air box rear sealing plate 4 form a positioning assembly with the middle partition plate 5, full welding is performed around the air box top sealing plate 3 and the air box rear sealing plate 4 and then they are welded integrally with the air box folding plate 1 and the two side plates 2.

[0051] Further, as Figure 3As shown, in order to facilitate the quick positioning and assembly of the middle partition plate and the air box folding plate, a front bending structure 53 is provided at the front part of the middle partition plate 5. A row of circular through holes is provided on the front bending structure 53, and the middle partition plate 5 is fixed to the air box folding plate 1 through a pressing plate 54 and a locknut 55.

[0052] Further, as Figure 2 、 4 shown, in order to facilitate the installation and fixation of the rear part of the switch, a switch fixing unit for installing the switch is further provided on the air box body. The switch fixing unit includes a support plate 71 and a rolling pin group 72. The front part of the switch is installed on the air box folding plate 1, and the rear part of the switch is installed on the support plate 71. At the same time, rolling pin groups 72 are provided on the inner walls of the two side plates 2 and the middle partition plate 5. Guide rail grooves 711 are provided at both ends of the support plate 71, and the guide rail grooves 711 at both ends of the support plate 71 are connected in cooperation with the rolling pin groups 71 on the middle partition plate 5 and the corresponding side plates 2. Further, the rollers in the air box middle partition plate and the two side plates can enable the switch to increase a degree of freedom in the front-rear direction through the guide rail grooves on the switch support, so that the switch will not generate a pulling force in the front-rear direction due to the deformation of the air box, thereby increasing the reliability of the switch.

[0053] Further, as Figure 4 shown, in order to facilitate the movement and cooperation of the support plate with the side plate and the middle partition plate, the rolling pin group 72 includes a pin 721 fixed on the middle partition plate 5 or the side plate 2. A roller 722 is sleeved on the pin 721. At the same time, locking caps 723 for limiting the roller 722 are provided at both ends of the pin 721.

[0054] Further, as Figure 5 、 6 、7, 8 shown, in order to realize the positioning and assembly of the air box top sealing plate and the air box rear sealing plate with the middle partition plate through hooks, replacing the welding connection method, a row of runway-shaped through holes is provided on the upper bending structure 51. The hook 6 on the air box top sealing plate 3 is inserted into the runway-shaped through hole and slides forward to hook the middle partition plate. When the middle partition plate limiting protrusion 56 in a convex shape provided on the middle partition plate 5 abuts against the bending part 31 of the air box top sealing plate 3, the air box top sealing plate 3 stops sliding, and after limiting the air box top sealing plate 3, the middle partition plate 5 and the air box top sealing plate 3 form a positioning assembly.

[0055] A row of runway-shaped through holes is provided on the rear bending structure 52. The hook 6 on the air box rear sealing plate 4 is inserted into the runway-shaped through hole and slides downward to hook the middle partition plate. After the air box rear sealing plate 4 abuts against the air box folding plate 1, the air box rear sealing plate 4 stops sliding, so that the middle partition plate 5 and the air box rear sealing plate 4 form a positioning assembly.

[0056] Further, as Figure 5As shown in the figure, in order to strengthen the strength of the air box folding plate and prevent it from deforming easily, a U-shaped reinforcing rib 11 for increasing its own strength is provided on the air box folding plate 1. The U-shaped reinforcing rib 11 is fixed to the air box folding plate 1 by means of an internal buckle using a T-shaped nut 12 through a welding stud 13. The strength of the internal buckle reinforcing rib is effectively increased compared to the reinforcing rib with the opening facing outwards, and an assembly method can be adopted.

[0057] Furthermore, as Figure 3 shown, in order to facilitate bundling and fixing the desiccant, a plurality of desiccant brackets 14 for bundling the desiccant are welded on the upper surface of the bottom of the air box folding plate 1.

[0058] Furthermore, as Figure 2 、 3 、12 shown, in order to further strengthen the strength of the side plates themselves and thus strengthen the overall structure of the air box, a plurality of runway-shaped reinforcing ribs 21 formed by stamping are provided on the two side plates 2.

[0059] Furthermore, as Figure 12 shown, in order to facilitate fixing the air box body on the assembly tooling and facilitate the subsequent assembly of the overall structure, a plurality of support blocks 22 are welded on the two side plates 2, and a corresponding nut 23 is welded on each support block 22 for fixing the air box body on the tooling.

[0060] Furthermore, as Figure 9 、 10 shown, in order to achieve positioning welding of the hook and ensure rapid positioning and assembly with the middle partition of the air box subsequently, positioning marks 61 for welding the hook 6 are provided on the top sealing plate 3 and the rear sealing plate 4 of the air box.

[0061] Furthermore, as Figure 11 shown, in order to achieve a lightweight design for the middle partition, the middle partition 5 has a cross-shaped hollow design for reducing its own weight and making it lightweight.

[0062] Furthermore, as Figure 3 shown, in order to reduce the deformation of the air box body in the lateral span and enhance the lateral rigidity strength, the air box folding plate 1 is integrally bent and formed, and the upper part of the air box folding plate 1 has an upper bending part 15 for enhancing strength. The air box folding plate 1 includes a vertical plate and a bottom plate formed by bending, and the connecting part of the vertical plate and the bottom plate has a stepped step for facilitating the installation of the busbar copper tube sleeve.

[0063] Furthermore, as Figure 1 、 2 、3 shown, in order to facilitate the overall hoisting and transportation of the air box, lifting rings for facilitating overall hoisting are provided at the tops of the two side plates 2.

[0064] In the present invention, a hook-type structure is adopted to achieve assembly constraints between the rear sealing plate weldment of the gas box, the top sealing plate weldment of the gas box, and the gas box folding plate and the middle partition plate of the gas box, so that the entire gas box is connected into a whole. Under the action of the gas pressure from the inside to the outside, the deformation of the gas box is reduced and the strength is increased. At the same time, adopting this assembly form for the middle partition plate of the gas box can reduce the welding workload, improve the production efficiency of the gas box, and can also solve the problem that the rear sealing plate of the gas box needs to be opened due to the connection with the gas box tie rod, thus increasing the risk of air leakage.

[0065] In summary, for the gas box of the coaxial ring main unit of the present invention, while taking into account the advantage of low cost of the gas box of the coaxial ring main unit, the original method of welding the gas box sealing plate to the gas box tie rod by opening holes in the gas box sealing plate, which is commonly used in coaxial ring main units, is changed to installing the gas box sealing plate on the middle partition plate of the gas box by means of hooks and assembly. At this time, the sealing plate does not need to be opened, and the air leakage points are reduced, thereby ensuring airtightness and reliability. Moreover, the assembly method is more efficient than the welding method, thus reducing the production cost of the switch. Using the middle partition plate of the gas box to replace the gas box tie rod can also strengthen the structure of the top sealing plate of the gas box, and the structural strength of the gas box is higher. Also, since the middle partition plate adopts the assembly method instead of the welding method, and because it is in the closed space inside the gas box, carbon steel material different from the stainless steel material of the gas box can be used, reducing the raw material cost. Further, the rollers in the middle partition plate and the two side plates of the gas box can enable the switch to increase a degree of freedom in the front-rear direction through the slide rail on the switch support, so that the switch will not generate a front-rear direction pulling force due to the deformation of the gas box, thereby increasing the reliability of the switch. The rear sealing plate and the top sealing plate of the gas box of this solution for the coaxial ring main unit are beautiful and flat without welding scars.

[0066] Inspired by the above ideal embodiments according to the present invention, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A gas tank for a co - box ring main unit, comprising a gas tank body. The gas tank body is formed by enclosing a gas tank folding plate (1), two side plates (2), a gas tank top sealing plate (3) and a gas tank rear sealing plate (4), and the gas tank body is filled with insulating gas. It is characterized in that: At least one hook row is provided on both the gas tank top sealing plate (3) and the gas tank rear sealing plate (4). The hook row includes a plurality of hooks (6). At least one middle partition plate (5) is arranged inside the gas tank body. An upper bending structure (51) is provided at the upper part of the middle partition plate (5). Through - hole rows corresponding to and cooperatively connected with the hook row on the gas tank top sealing plate (3) are arranged on the upper bending structure (51). The hooks (6) on the gas tank top sealing plate (3) are inserted into the corresponding through - holes on the upper bending structure (51) and then hook the middle partition plate, so that the middle partition plate (5) and the gas tank top sealing plate (3) form a positioning assembly. A rear bending structure (52) is provided at the rear part of the middle partition plate (5). Through - hole rows corresponding to and cooperatively connected with the hook row on the gas tank rear sealing plate (4) are arranged on the rear bending structure (52). The hooks (6) on the gas tank rear sealing plate (4) are inserted into the corresponding through - holes on the rear bending structure (52) and then hook the middle partition plate, so that the middle partition plate (5) and the gas tank rear sealing plate (4) form a positioning assembly. After the gas tank top sealing plate (3) and the gas tank rear sealing plate (4) form a positioning assembly with the middle partition plate (5), full welding is carried out around the gas tank top sealing plate (3) and the gas tank rear sealing plate (4), and then they are welded into one body with the gas tank folding plate (1) and the two side plates (2).

2. The gas tank of the coaxial ring main unit according to claim 1, characterized in that: A front bending structure (53) is provided at the front part of the middle partition plate (5). A circular through - hole row is provided on the front bending structure (53), and the middle partition plate (5) is fixed to the gas tank folding plate (1) through a pressing plate (54) and a locknut (55).

3. The gas tank of the coaxial ring main unit according to claim 1, characterized in that: A switch fixing unit for installing a switch is further provided on the gas tank body. The switch fixing unit includes a support plate (71) and a rolling pin group (72). The front part of the switch is installed on the gas tank folding plate (1), and the rear part of the switch is installed on the support plate (71). At the same time, rolling pin groups (72) are provided on the inner walls of the two side plates (2) and on the middle partition plate (5). Guide rail grooves (711) are provided at both ends of the support plate (71), and the guide rail grooves (711) at both ends of the support plate (71) are cooperatively connected with the rolling pin groups (71) on the middle partition plate (5) and the corresponding side plates (2).

4. The gas tank of the coaxial ring main unit according to claim 3, characterized in that: The rolling pin group (72) includes a pin (721) fixed on the middle partition plate (5) or the side plate (2). A roller (722) is sleeved on the pin (721). At the same time, lock caps (723) for limiting the roller (722) are provided at both ends of the pin (721).

5. The gas tank of the common box ring main unit according to claim 1, characterized in that: A row of runway-shaped through holes is provided on the upper bending structure (51). After the hooks (6) on the top sealing plate (3) of the air box are inserted into the runway-shaped through holes and slide forward to hook the middle partition plate, the convex middle partition plate limiting protrusion (56) provided on the middle partition plate (5) abuts against the bending part (31) of the top sealing plate (3) of the air box. After limiting the top sealing plate (3) of the air box, the middle partition plate (5) and the top sealing plate (3) of the air box form a positioning assembly. A row of runway-shaped through holes is provided on the rear bending structure (52). The hooks (6) on the rear sealing plate (4) of the air box are inserted into the runway-shaped through holes and slide downward to hook the middle partition plate. After the rear sealing plate (4) of the air box abuts against the air box folding plate (1), the middle partition plate (5) and the rear sealing plate (4) of the air box form a positioning assembly.

6. The gas tank of the common box ring main unit according to claim 1, characterized in that: The air box folding plate (1) is provided with a U-shaped reinforcing rib (11) for increasing its own strength. The U-shaped reinforcing rib (11) is fixed to the air box folding plate (1) by using a T-shaped nut (12) through a welding stud (13) in an inward buckling manner.

7. The gas tank of the metal-enclosed ring main unit according to claim 1, characterized in that: A plurality of desiccant brackets (14) for bundling desiccants are welded on the upper surface of the bottom of the air box folding plate (1).

8. The gas tank of the common box ring main unit according to claim 1, characterized in that: A plurality of runway-shaped reinforcing ribs (21) formed by stamping are provided on the two side plates (2).

9. The gas tank of the common box ring main unit according to claim 1, characterized in that: A plurality of support blocks (22) are welded on the two side plates (2), and corresponding nuts (23) are welded on each support block (22) for fixing the air box body on the tooling.

10. The gas tank of the common box ring main unit according to claim 1, characterized in that: Identification marks (61) for positioning are provided on the top sealing plate (3) and the rear sealing plate (4) of the air box when welding the hooks (6). The middle partition plate (5) has a cross-shaped hollow design for reducing its own weight and making it lightweight. The upper part of the air box folding plate (1) has an upper bending part (15) for enhancing strength, and lifting rings for convenient overall lifting are provided at the tops of the two side plates (2).

Images