Pickling tank cover

Abstract

The utility model belongs to the technical field of pickling bath appliances, and discloses a pickling bath cover. The pickling tank cover comprises a first cover body and a second cover body which are used for being spliced into an integrated structure, one edge of the first cover body in the length direction is fixedly provided with a first connecting part, and one edge of the second cover body in the length direction is fixedly provided with a second connecting part; the first connecting part and the second connecting part are matched with each other, and the first cover body and the second cover body are detachably connected in a sealed mode through the first connecting part and the second connecting part. The pickling tank cover disclosed by the utility model is composed of the plurality of cover bodies, the length of the pickling tank cover can be changed by arranging the connecting parts with the inserting or receiving function on the cover bodies and adjusting the number of the cover bodies, and the pickling tank cover is arranged above pickling tanks with different lengths in a covering manner, so that the pickling tank cover is suitable for the pickling tanks.

Description

Technical Field

[0001] The utility model relates to the technical field of pickling tank appliances, and specifically relates to a pickling tank cover. Background Art

[0002] Most of the current pickling tanks are open type, and a tank cover needs to be added above the tank opening to prevent the acidic gas in the pickling tank from volatilizing into the external space. The conventional treatment method is to buckle a pickling tank cover that matches the size of the tank opening above the pickling tank. However, this method has the following disadvantages: If the pickling tank is too long, it is not easy to find an integral tank cover of the corresponding size; Even if an integral tank cover of the corresponding size is found, due to the long length and large weight of the tank cover, the production and transportation costs are increased.

[0003] In addition, for an integral pickling tank cover, since most of the pickling tanks contain volatile strong acids, the inner side of the tank cover is easily corroded locally. Therefore, the whole tank cover needs to be removed from above the tank opening for maintenance, and in some cases, the whole tank cover needs to be replaced, resulting in high maintenance costs in the later stage of use. Summary of the Utility Model

[0004] To solve the above-mentioned deficiencies in the prior art, the utility model aims to provide a pickling tank cover, which is composed of two or more cover bodies, and the length of each cover body is appropriate, solving the problem that when the length of the integral tank cover is long, the weight of the tank cover is too large and it is not convenient for production and transportation, and avoiding the problem that when a part of the tank cover is damaged, the whole tank cover needs to be replaced.

[0005] To achieve the above object, the technical solution adopted by the utility model is as follows: A pickling tank cover includes a first cover body and a second cover body used for being assembled into an integral structure. One edge in the length direction of the first cover body is fixedly provided with a first connecting portion, and one edge in the length direction of the second cover body is fixedly provided with a second connecting portion; The first connecting portion and the second connecting portion are mutually adapted, and the first cover body and the second cover body are detachably connected in a sealed manner through the first connecting portion and the second connecting portion.

[0006] As a limitation of the utility model: The first connecting portion has one of the functions of inserting or receiving, and the second connecting portion has the other of the functions of inserting or receiving; The connecting portion with the receiving function is an upwardly convex arched shell structure, and its cross-sectional view is in the shape of "￢", and the connecting portion with the inserting function is a flat shell structure, and its cross-sectional view is in the shape of "—", and the connecting portion with the inserting function is inserted under the arch formed by the connecting portion with the receiving function.

[0007] As a definition of the present utility model: there is a gap between the first connecting part and the second connecting part that are assembled with each other, and a strip-shaped sealing member is accommodated in the gap, the length of the sealing member corresponds to the length of the gap, and the shape of the sealing member is adapted to the shape of the gap; a first through hole is provided on the first connecting part, a second through hole is provided on the second connecting part, and a third through hole is provided on the sealing member, the first through hole, the second through hole and the third through hole are coaxially arranged, and the sizes are adapted to each other, and fasteners are simultaneously passed through the first through hole, the second through hole and the third through hole.

[0008] As a limitation of the present invention: a downward extending shell-shaped blocking plate is fixedly provided on one side of the first cover body opposite to the first connecting portion and on one side of the second cover body opposite to the second connecting portion, and the downward extending distance of the blocking plate is the same as the height of the first cover body and the second cover body.

[0009] As a definition of the present invention: the pickling tank cover also includes at least one third cover body detachably connected between the first cover body and the second cover body, and a third connecting part and a fourth connecting part are fixedly provided on two opposite edges in the length direction of the third cover body; the third connecting part and the first connecting part are adapted to each other, the third connecting part has one of the plug-in or receiving functions, and the first connecting part has the other of the plug-in or receiving functions, and the first cover body and the third cover body are detachably connected through the first connecting part and the third connecting part; the fourth connecting part and the second connecting part are adapted to each other, the fourth connecting part has one of the plug-in or receiving functions, and the second connecting part has the other of the plug-in or receiving functions, and the second cover body and the third cover body are detachably connected through the second connecting part and the fourth connecting part.

[0010] As a limitation of the present utility model: a fourth through hole is provided on the third connecting part, a fifth through hole is provided on the fourth connecting part, and there are gaps between the first connecting part and the third connecting part, and the second connecting part and the fourth connecting part that are spliced together, and a strip seal is accommodated in the gap; when the first connecting part and the third connecting part are spliced together, the first through hole, the third through hole, and the fourth through hole are coaxially arranged, and the sizes are adapted to each other, and fasteners are simultaneously penetrated through the first through hole, the third through hole, and the fourth through hole; when the second connecting part and the fourth connecting part are spliced together, the second through hole, the third through hole, and the fifth through hole are coaxially arranged, and the sizes are adapted to each other, and fasteners are simultaneously penetrated through the second through hole, the third through hole, and the fifth through hole.

[0011] As a limitation of the present invention: the first cover body, the second cover body and the third cover body are all arched shell structures, and their surfaces are all upwardly convex curved surfaces.

[0012] As a limitation of the present invention: at least one strip-shaped reinforcing rib along the arch direction is fixedly provided on the first cover body, the second cover body and the third cover body.

[0013] As a limitation of the present invention: at least one handle is fixedly provided on the first cover body, the second cover body and the third cover body.

[0014] As a limitation of the present invention: at least one ventilation structure is fixedly connected to the first cover body, the second cover body and the third cover body.

[0015] Due to the adoption of the above technical solution, the present invention achieves the following beneficial effects compared to the prior art: by providing a connecting portion with a plug-in or receiving function on the cover body, multiple covers can be spliced together, and the number of covers can be adjusted according to the length of the slot, thereby obtaining a pickling tank cover with variable length; when the slot to be covered is long, the number of covers can be increased, thereby obtaining a longer pickling tank cover to meet the need to cover the longer slot. At the same time, each cover can be pre-fabricated in the factory, and the weight and volume of each cover are moderate, making it easy to splice and install the tank cover at the pickling site, avoiding the problem of using an integrated tank cover to cover a long slot, which is long, heavy, and inconvenient to produce and transport.

[0016] When a single cover in the pickling tank cover is locally corroded or damaged, this spliced pickling tank cover can repair or replace the damaged cover separately, which is more convenient to operate and saves the cost of replacing the cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a schematic diagram of the top view of the structure of Example 1 of the present utility model;

[0019] Figure 2 for Figure 1 AA cross-sectional structural diagram;

[0020] Figure 3 This is a schematic top view of the first cover body of Example 1 of the present utility model;

[0021] Figure 4 for Figure 3 BB cross-sectional structure diagram;

[0022] Figure 5 This is a schematic top view of the second cover body of Example 1 of the present utility model;

[0023] Figure 6 This is a front view structural diagram of the sealing element of the present invention;

[0024] Figure 7 This is a left-side structural diagram of the sealing element of the present invention;

[0025] Figure 8 It is a top view structural schematic diagram of Embodiment 2 of the present utility model;

[0026] Figure 9 is Figure 8 C-C cross-sectional structural schematic diagram of;

[0027] Figure 10 is Figure 8 D-D cross-sectional structural schematic diagram of;

[0028] Figure 11 It is a top view structural schematic diagram of the third cover body of Embodiment 2 of the present utility model;

[0029] Figure 12 is Figure 11 E-E cross-sectional structural schematic diagram of;

[0030] Figure 13 It is a top view structural schematic diagram of Embodiment 3 of the present utility model.

[0031] In the figure: 1 - first cover body, 2 - second cover body, 3 - first connecting portion, 4 - second connecting portion, 5 - seal, 6 - first through hole, 7 - second through hole, 8 - third through hole, 9 - third cover body, 10 - third connecting portion, 11 - fourth connecting portion, 12 - fourth through hole, 13 - fifth through hole, 14 - plug plate, 15 - reinforcing rib, 16 - handle, 17 - ventilation structure, 18 - flange. Specific embodiments

[0032] The preferred embodiments of the present utility model are described below with reference to the accompanying drawings. It should be understood that the pickling tank covers described herein are all preferred embodiments, which are only used to illustrate and explain the present utility model and do not constitute a limitation to the present utility model.

[0033] The orientation terms or positional relationships such as "upper", "lower", "left", "right", etc. described in the present utility model are based on the orientation relationship of the accompanying drawings of the present utility model specification. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the content protected by the present utility model.

[0034] Embodiment 1

[0035] A pickling tank cover, as Figure 1As shown in the figure, it includes a first cover 1 and a second cover 2 that can be assembled into an integral structure. Both the first cover 1 and the second cover 2 are arched shell structures. Their surfaces are all upwardly convex curved surfaces, and their top views are all quadrilaterals. In addition, the surfaces of the two covers can also be upwardly convex prismatic surfaces, so that there is a spacing between the covers and the acid solution in the pickling tank, preventing the covers from directly contacting the acid solution. At the same time, both the first cover 1 and the second cover 2 are made of fiberglass material, making the overall strength of the pickling tank cover relatively high and having good chemical corrosion resistance. According to the different lengths of the pickling tank to be covered, the construction personnel can measure the length of the pickling tank opening in advance. When the two covers are produced in the factory, the sum of the lengths of the two covers is matched with the length of the opening, and the widths of both the first cover 1 and the second cover 2 should be greater than the width of the opening, so that the assembled pickling tank cover can completely cover the opening and prevent acid mist from overflowing. After the production in the factory is completed, the two covers are transported to the pickling site for splicing, and the assembled pickling tank cover is integrally buckled above the opening.

[0036] As Figure 3 and Figure 5 shown in the figure, a first connecting part 3 is fixedly arranged on the first cover 1. The first connecting part 3 has one of the functions of inserting or receiving. A second connecting part 4 is fixedly arranged on the second cover 2. The second connecting part 4 has the other of the functions of inserting or receiving. In this embodiment, the first connecting part 3 has the receiving function, and the second connecting part 4 has the inserting function. As Figure 2 shown in the figure, the first connecting part 3 with the receiving function is an upwardly convex arched shell structure, and its cross-sectional view is in the shape of "¬". The second connecting part 4 with the inserting function is a flat shell structure, and its cross-sectional view is in the shape of "—". The second connecting part 4 is inserted below the first connecting part 3. The shapes and sizes of the first connecting part 3 and the second connecting part 4 are mutually adapted, and the first cover 1 and the second cover 2 are detachably connected through the first connecting part 3 and the second connecting part 4. In addition, fastening structures can also be simultaneously penetrated on the opposite edges of the first cover 1 and the second cover 2 to achieve detachable connection between the two covers. At the same time, as Figure 4 shown in the figure, the top of the first cover 1 has a certain span and extends downward on both sides, and it can be placed on the pickling tank.

[0037] Furthermore, as Figure 2As shown, there is a gap between the mutually joined first connecting portion 3 and second connecting portion 4. A strip-shaped seal 5 is accommodated in the gap, and its length corresponds to the length of the gap, and the shape of the seal 5 is adapted to the shape of the gap. The gap extends along the arched surfaces of the first cover body 1 and the second cover body 2 and has a long and narrow arched shape. Preferably, the seal 5 is made of a soft material. One side is a hollow circular structure, and its edge can be deformed to adapt to gaps of different sizes; the other side of the seal 5 is a solid structure, and after stretching, it is strip-shaped. As Figure 6 and Figure 7 shown, after bending the seal 5 along its length direction, an arch shape adapted to the cross-sectional view shape of the cover body can be obtained, so that the seal 5 can be better filled in the gap.

[0038] At the same time, a number of first through holes 6 are provided in the first connecting portion 3, a number of second through holes 7 are provided in the second connecting portion 4, and a number of third through holes 8 are provided in the seal 5. The number of the first through holes 6, the second through holes 7, and the third through holes 8 is the same and they are coaxially arranged. Thus, a number of channels for fasteners to pass through are formed in the first connecting portion 3, the seal 5, and the second connecting portion 4. Fasteners are simultaneously inserted through the first through holes 6, the second through holes 7, and the third through holes 8 that correspond to each other in position. Specifically, the fasteners are bolts, which are used to fix the sealing ring in the gap formed between two adjacent connecting portions, prevent acidic gas from leaking from the gap, and contribute to protecting the surrounding environment.

[0039] The process of using the seal 5 to seal the gap is as follows: First, place the second cover body 2 on the ground and equally spacedly provide a number of second through holes 7 in the second connecting portion 4; secondly, lay the strip-shaped seal 5 along the upper surface of the arched second connecting portion 4, and according to the positions of the second through holes 7, provide a number of third through holes 8 with the same size as the second through holes 7 at the part of the seal 5 far from the hollow circular structure; then, place the first connecting portion 3 of the first cover body 1 on the seal 5, provide a number of first through holes 6 with the same size as the second through holes 7 in the first connecting portion 3, and ensure that the positions of the first through holes 6, the second through holes 7, and the third through holes 8 correspond to each other; finally, simultaneously insert fasteners (not shown in the figure) through these three through holes, thereby realizing fixing the seal 5 in the gap between the first cover body 1 and the second cover body 2 and improving the sealing performance of the pickling tank cover.

[0040] As Figure 3 and Figure 5As shown, a shell-shaped blocking plate 14 is fixedly mounted on the side of the first cover 1 opposite the first connection portion 3 to seal the outlet on the side of the first cover 1 away from the first connection portion 3. The blocking plate 14 extends downward the same distance as the height of the first cover 1 and is quadrilateral in a top view, thereby shielding the edge of the pickling tank and preventing the gas within the tank from escaping to the outside. A blocking plate 14 is also fixedly mounted on the side of the second cover 2 opposite the second connection portion 4, extending downward the same distance as the height of the second cover 2. The structure of the blocking plate 14 on the second cover 2 is the same as described above and will not be repeated here.

[0041] The top of the pickling tank cover needs to have a certain span to fit over the notch. To ensure structural stability, at least one arched reinforcing rib 15 is fixedly installed on the outer surface of each of the first and second covers 1 and 2. This prevents the covers from twisting or deforming during the pickling process. Furthermore, the strip-shaped reinforcing ribs 15 can be arranged in a grid pattern on the surface of the cover. The number of reinforcing ribs 15 can be adjusted based on the size of the cover to further stabilize the cover structure.

[0042] During the process of transporting and assembling the cover, the cover needs to be lifted. Therefore, at least one handle 16 is fixedly installed on each of the first cover 1 and the second cover 2. The handle 16 provides a force point for construction personnel or lifting devices. Preferably, there are four handles 16 on each cover, and they are distributed near the four corners of the cover. This helps to lift the cover smoothly and prevent the cover from sliding or falling off during installation. In addition, flanges 18 are fixedly installed symmetrically on the side walls of the first cover 1 relative to the center line to connect the pickling tank cover to other equipment.

[0043] Since a connection part with a plug-in or receiving function is provided on the cover body, the integrated pickling tank cover can be replaced by a combined cover body formed by splicing together a first cover body 1 and a second cover body 2 that are independent of each other, and the two covers can be adaptively changed according to the actual measured notch length. Therefore, in the case of a long pickling tank, the pickling tank cover can be divided into two parts and manufactured separately. The weight and size of each cover body are moderate, avoiding the problem that the integrated tank cover is too heavy when the length is long, which is inconvenient for production and transportation. In addition, when the first cover body 1 or the second cover body 2 in the pickling tank cover is partially corroded or damaged, the damaged cover body can be repaired or replaced separately; if an integrated tank cover is used, the entire cover body needs to be replaced. This method of repairing the damaged cover body separately is easy to operate and saves the cost of replacing the cover body.

[0044] Example 2

[0045] When the length of the pickling tank is relatively long, it is necessary to appropriately extend the lengths of the first cover body 1 and the second cover body 2 so as to be able to completely cover the tank opening. If the lengths of the first cover body 1 and the second cover body 2 continue to increase, there will still be problems that due to the large self-weight of a single cover body, it is inconvenient for production, transportation and installation. At this time, at least one third cover body 9 needs to be added between the first cover body 1 and the second cover body 2, which can not only make the length of each cover body in the pickling tank cover moderate, but also completely cover the tank opening, facilitating the production and handling of a single cover body. The third cover body 9 is made of fiberglass and can be used as a standardized cover body. Its size is preset and it is mass-produced in the factory. The size parameters and structures of each batch of the produced third cover bodies 9 are the same, which is convenient for use.

[0046] As Figure 8 shown, the third cover body 9 is detachably connected between the first cover body 1 and the second cover body 2, and the first cover body 1, the second cover body 2 and the third cover body 9 can be assembled into an integral structure. As Figure 11 and Figure 12 shown, the third cover body 9 is of a shell structure. Its surface is a curved surface protruding upward, its top view is a quadrilateral, and its cross-sectional view is an arch. In addition, the surface of the third cover body 9 can also be a quadrangular prism surface protruding upward to prevent it from directly contacting the acid liquid in the pickling tank. Third connecting parts 10 and fourth connecting parts 11 are fixedly arranged on two opposite edges of the third cover body 9, and the other two opposite edges of the third cover body 9 both bend downward and extend the same distance so as to be able to be placed on the pickling tank.

[0047] The third connecting part 10 and the first connecting part 3 are mutually adapted. The third connecting part 10 has one of the functions of inserting or receiving, and the first connecting part 3 has the other of the functions of inserting or receiving. The first cover body 1 and the third cover body 9 are detachably connected through the first connecting part 3 and the third connecting part 10; the fourth connecting part 11 and the second connecting part 4 are mutually adapted. The fourth connecting part 11 has one of the functions of inserting or receiving, and the second connecting part 4 has the other of the functions of inserting or receiving. The second cover body 2 and the third cover body 9 are detachably connected through the second connecting part 4 and the fourth connecting part 11. In this embodiment, the first connecting part 3, the second connecting part 4, the third connecting part 10 and the fourth connecting part 11 respectively have the functions of receiving, inserting, inserting and receiving.

[0048] Furthermore, a fourth through hole 12 is formed in the third connecting part 10, and a fifth through hole 13 is formed in the fourth connecting part 11. There are gaps between the assembled first connecting part 3 and the third connecting part 10, and the second connecting part 4 and the fourth connecting part 11, and a sealing member 5 is accommodated in the gaps to improve the sealing performance of the pickling tank cover. As Figure 9As shown, when the first connecting part 3 and the third connecting part 10 are joined together, the first through hole 6, the third through hole 8, and the fourth through hole 12 are coaxially arranged and have mutually adapted sizes. A fastener (not shown in the figure) is simultaneously inserted through the first through hole 6, the third through hole 8, and the fourth through hole 12; as Figure 10 shown, when the second connecting part 4 and the fourth connecting part 11 are joined together, the second through hole 7, the third through hole 8, and the fifth through hole 13 are coaxially arranged and have mutually adapted sizes. A fastener (not shown in the figure) is simultaneously inserted through the second through hole 7, the third through hole 8, and the fifth through hole 13.

[0049] Reinforcing ribs 15 and a handle 16 are further provided on the third cover body 9, and their structures, positions, and quantities are set with reference to Embodiment 1, and no repeated description is given in this embodiment.

[0050] Since any number of third cover bodies 9 are added between the first cover body 1 and the second cover body 2, the length of the pickling tank cover is flexibly variable, and it can better adapt to pickling tanks of different lengths. In actual application, the length of the tank opening to be covered can be measured to determine the appropriate number of third cover bodies 9. At this time, the lengths of the first cover body 1 and the second cover body 2 are adaptively adjusted so that the total length of the first cover body 1, the second cover body 2, and the third cover body 9 joined together is the same as the length of the tank opening, thereby obtaining a pickling tank cover that matches the size of the pickling tank.

[0051] Embodiment 3

[0052] A pickling tank cover, on the basis of Embodiment 2, a ventilation structure 17 is further connected to the cover body. As Figure 13 shown, at least one ventilation structure 17 is fixedly connected to the first cover body 1, the second cover body 2, and the third cover body 9 in total. Preferably, the ventilation structure 17 is opened on the third cover body 9, and acidic gas can be discharged to the outside in time, so that excessive acidic gas will not accumulate in the pickling tank, and corrosion of the cover body caused by the acidic gas volatilized from the acid solution in the pickling tank can be avoided. This third cover body 9 with the ventilation structure 17 can be mass-produced and can be spliced and used with the third cover body 9 in Embodiment 2. When the pickling tank cover is only formed by joining the first cover body 1 and the second cover body 2, the ventilation structure 17 can be opened on the side wall of the first cover body 1 or the second cover body 2.

[0053] In the case where there is more acid solution in the pickling tank, the number of the ventilation structures 17 is not limited to one to meet the need of timely discharging the acidic gas to the outside. Preferably, the ventilation structure 17 is an air duct, one end of which is communicated with the pickling tank and the other end is communicated with the outside. The number and specific structure of the ventilation structure 17 are not overly limited in this embodiment, as long as the purpose of timely discharging the acidic gas can be achieved.

Claims

1. An acid pickling tank cover, characterized in that: It includes a first cover body and a second cover body for being assembled into an integral structure. One edge in the length direction of the first cover body is fixedly provided with a first connecting portion, and one edge in the length direction of the second cover body is fixedly provided with a second connecting portion. The first connecting portion and the second connecting portion are mutually adapted, and the first cover body and the second cover body are detachably connected in a sealed manner through the first connecting portion and the second connecting portion.

2. The pickling tank cover according to claim 1, characterized in that: The first connecting portion has one of the functions of insertion or reception, and the second connecting portion has the other of the functions of insertion or reception. The connecting portion with the reception function is an upwardly convex arched shell-like structure, and its cross-sectional view is in the shape of "¬", and the connecting portion with the insertion function is a flat plate-like shell-like structure, and its cross-sectional view is in the shape of "—". The connecting portion with the insertion function is inserted under the arch formed by the connecting portion with the reception function.

3. The pickling tank cover according to claim 2, wherein: There is a gap between the mutually assembled first connecting portion and the second connecting portion, and a strip-shaped sealing member is accommodated in the gap. The length of the sealing member corresponds to the length of the gap, and the shape of the sealing member is mutually adapted to the shape of the gap. A first through hole is provided on the first connecting portion, a second through hole is provided on the second connecting portion, and a third through hole is provided on the sealing member. The first through hole, the second through hole, and the third through hole are coaxially arranged and have mutually adapted sizes, and a fastening member is simultaneously passed through the first through hole, the second through hole, and the third through hole.

4. The pickling tank cover according to claim 3, characterized in that: On one side of the first cover body opposite to the first connecting portion and on one side of the second cover body opposite to the second connecting portion, downwardly extending shell-like blocking plates are fixedly provided, and the distance that the blocking plates extend downward is the same as the height of the first cover body and the second cover body.

5. The pickling tank cover according to claim 4, wherein: It further includes at least one third cover body detachably connected between the first cover body and the second cover body. Third connecting portions and fourth connecting portions are fixedly provided on two opposite edges in the length direction of the third cover body. The third connecting portion and the first connecting portion are mutually adapted. The third connecting portion has one of the functions of insertion or reception, and the first connecting portion has the other of the functions of insertion or reception. The first cover body and the third cover body are detachably connected through the first connecting portion and the third connecting portion. The fourth connecting portion and the second connecting portion are mutually adapted. The fourth connecting portion has one of the functions of insertion or reception, and the second connecting portion has the other of the functions of insertion or reception. The second cover body and the third cover body are detachably connected through the second connecting portion and the fourth connecting portion.

6. The pickling tank cover according to claim 5, characterized in that: A fourth through hole is provided on the third connecting portion, and a fifth through hole is provided on the fourth connecting portion. There are gaps between the mutually assembled first connecting portion and the third connecting portion and between the second connecting portion and the fourth connecting portion, and strip-shaped sealing members are accommodated in the gaps. When the first connecting portion and the third connecting portion are mutually assembled, the first through hole, the third through hole, and the fourth through hole are coaxially arranged and have mutually adapted sizes, and a fastening member is simultaneously passed through the first through hole, the third through hole, and the fourth through hole. When the second connecting portion and the fourth connecting portion are mutually assembled, the second through hole, the third through hole, and the fifth through hole are coaxially arranged and have mutually adapted sizes, and a fastening member is simultaneously passed through the second through hole, the third through hole, and the fifth through hole.

7. The pickling tank cover according to claim 5 or 6, characterized in that: The first cover body, the second cover body, and the third cover body are all arched shell structures, and their surfaces are all upwardly convex curved surfaces.

8. The pickling tank cover according to claim 7, wherein: At least one strip-shaped reinforcing rib along the arch direction is fixedly arranged on each of the first cover body, the second cover body, and the third cover body.

9. The pickling tank cover according to claim 8, wherein: At least one handle is fixedly arranged on each of the first cover body, the second cover body, and the third cover body.

10. The pickling tank cover according to claim 9, characterized in that: At least one ventilation structure is fixedly connected to the first cover body, the second cover body, and the third cover body together.

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