Acid liquor self-circulation sealing pickling tank for stainless steel pipe

By designing the self-circulation sealing pickling tank for stainless steel pipe acid solution, and using sliding and driving mechanisms to realize the automatic pickling and pickling liquid circulation of stainless steel pipes, the problem of the time spent on stainless steel pipe pickling tanks in the existing technology is solved, and the problem of the operation of stainless steel pipe pickling tanks is improved. Pickling efficiency and convenience.

CN222182454UActive Publication Date: 2024-12-17ZHEJIANG XINTUO PIPE IND CO LTD
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Patent Information

Application Number
CN202420918401.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-29
Publication Date
2024-12-17
Estimated Expiration
2034-04-29

AI Technical Summary

Technical Problem

The existing pickling tank for stainless steel pipes takes a long time and is inconvenient to place and remove stainless steel pipes, which affects the pickling efficiency.

Method used

A self-circulation sealing pickling tank for stainless steel pipe acid solution is designed, including pickling tank 1, pickling tank 2 and U-shaped base, which is fixedly connected by U-shaped base, above the pickling tank 1 and pickling tank 2 The bearing mechanism is slidingly installed, and the driving mechanism is fixed at both ends. It is equipped with a pickling liquid circulation mechanism and a filter plate. It uses electric push rods and solenoid valves to realize the automatic pick-up and pickling liquid circulation of stainless steel pipes.

Benefits of technology

It realizes convenient pick-up and efficient pick-up of stainless steel pipes, saving time, improving pick-up efficiency, and more convenient and flexible operation.

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Abstract

The utility model provides an acid liquor self-circulation sealed pickling tank for stainless steel tubes, which comprises a pickling tank I, a pickling tank II and a U-shaped base, the lower part between the pickling tank I and the pickling tank II is fixedly connected through the U-shaped base, and a bearing mechanism is slidably mounted above the part between the pickling tank I and the pickling tank II; driving mechanisms are fixedly mounted at the two ends of the pickling tank I respectively; the driving mechanism is fixedly connected with the bearing mechanism; by means of the overall arrangement, in the stainless steel pipe taking and placing process, time waste can be reduced, meanwhile, in the stainless steel pipe taking and placing process, overall normal work cannot be affected, and therefore the whole device is more convenient, flexible and efficient.
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Description

Technical Field

[0001] The utility model belongs to the field of stainless steel pipe pickling, in particular to a stainless steel pipe acid liquid self-circulating sealed pickling tank. Background Art

[0002] As we all know, after the stainless steel pipe is pickled and passivated, its corrosion resistance, surface finish, liquid fluidity and hygienic performance can be improved, and it is suitable for a variety of industrial fields and application scenarios. In order to facilitate the pickling of stainless steel pipes, the stainless steel pipes need to be placed in the corresponding pickling tank.

[0003] Although there are many different pickling tanks for stainless steel pipes on the market, the existing pickling tanks for stainless steel pipes not only take a lot of time to place the stainless steel pipes in the pickling tanks and take the stainless steel pipes out of the pickling tanks, but are also very inconvenient, thus affecting the pickling efficiency.

[0004] Therefore, it is very necessary to invent a kind of stainless steel pipe acid liquid self-circulating sealed pickling tank which is easy to take and put. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a technical solution adopted by a self-circulating sealed pickling tank for stainless steel pipes with acid solution: a self-circulating sealed pickling tank for stainless steel pipes with acid solution, comprising a pickling tank 1, a pickling tank 2 and a U-shaped base, wherein: the lower part between the pickling tank 1 and the pickling tank 2 is fixedly connected by the U-shaped base, and a bearing mechanism is slidably installed above the pickling tank 1 and the pickling tank 2, and a driving mechanism is fixedly installed at each end of the pickling tank 1; the driving mechanism and the bearing mechanism are fixedly connected;

[0006] Preferably, a pickling liquid circulation mechanism is fixedly installed at one end below the pickling tank 1 and the pickling tank 2, and a feed port is opened above the opposite side of the pickling tank 1 and the pickling tank 2; the bearing mechanism is in the feed port and is slidably connected to the feed port; two filter plates are evenly installed on the pickling tank 1 and the pickling tank 2;

[0007] Preferably, the bearing mechanism includes a sealing plate, and a discharge pool 1 is fixedly installed on one side of the sealing plate, and a discharge pool 2 is fixedly installed on the other side of the sealing plate; the openings of the discharge pool 1 and the discharge pool 2 are both facing upward, and the bottoms of the discharge pool 1 and the discharge pool 2 are respectively provided with a drainage port, and the discharge pool 1 and the discharge pool 2 are arranged in a mirror image position with the sealing plate as the center; the sizes of the discharge pool 1 and the discharge pool 2 match the size of the feed port, and the discharge pool 1 is slidably connected to the feed port on the pickling tank 2, and the discharge pool 2 is slidably connected to the feed port on the pickling tank 1; the size of the sealing plate is larger than the size of the feed port; the two ends of the sealing plate are fixedly connected to the corresponding driving mechanism; an electromagnetic valve is fixedly installed inside the drainage port;

[0008] Preferably, the driving mechanism includes an electric push rod and a fixed seat, and the tail end of the electric push rod housing is vertically fixedly connected to a side surface of the fixed seat, and the output end of the electric push rod is fixedly connected to one end of the sealing plate; the electric push rod and the sealing plate are vertically arranged; the fixed seat is fixedly connected to one end of the pickling tank.

[0009] Preferably, fixing ears are fixedly installed at both ends of the sealing plate, and two supporting legs are evenly fixedly installed on both sides below the sealing plate, and a roller groove is opened at the bottom of the supporting leg; a roller is rotatably installed in the roller groove, and the roller is located in a U-shaped base, and the roller is in rolling contact with the bottom surface inside the U-shaped base; the fixing ears are fixedly connected to the output end of the corresponding electric push rod.

[0010] Preferably, the interior of the pickling tank one and the pickling tank two is respectively provided with an acid storage cavity, and the interior of the acid storage cavity is respectively fixedly installed with a partition, and a cavity is penetrated on the partition; corresponding slide grooves are respectively provided at both ends of the partition and on both sides of the interior of the acid storage cavity; plug holes are respectively evenly provided on both sides of the exterior of the pickling tank one and the pickling tank two, and the positions of the plug holes correspond to the positions of the slide grooves, and the plug holes are connected with the interior of the acid storage cavity; a plurality of nozzles are respectively evenly fixedly installed above the interior of the acid storage cavity, and the nozzles and the acid storage cavity are fixedly connected and connected with the corresponding pickling liquid circulation mechanism; the feed port is connected with the acid storage cavity, and the feed port is above the partition, and the direction of the feed port is consistent with the direction of the cavity; the filter plate is installed in the corresponding slide groove by plugging and unplugging the plug hole; the

[0011] Preferably, the pickling liquid circulation mechanism includes a pump box and a delivery pipe, and the pump boxes are fixedly installed below one end of the pickling tank one and the pickling tank two, and a circulation pump is fixedly installed inside the pump box; the liquid inlet end of the circulation pump is communicated with the acid storage chamber below the filter plate, and the liquid outlet end of the circulation pump is fixedly connected to one end of the delivery pipe, and the other end of the delivery pipe is fixedly connected to and communicated with the nozzles inside the corresponding pickling tank one and the pickling tank two.

[0012] Preferably, a control box is fixedly installed outside the pickling tank 1, and the controller inside the control box is electrically connected to the electromagnetic valve, the electric push rod and the circulation pump.

[0013] Compared with the prior art, the advantages of the utility model are:

[0014] The overall arrangement of the utility model is as follows: first, a stainless steel pipe that needs to be pickled is placed in discharge pool one, and the discharge pool one carries the stainless steel pipe into the pickling pool two for pickling. At this time, the discharge pool two will leak out from the pickling pool one, and the stainless steel pipe that needs to be pickled can be placed in the discharge pool two. In this way, after the stainless steel pipe in the discharge pool one is washed and removed from the pickling pool two, the discharge pool two will carry the stainless steel pipe directly into the pickling pool one for pickling, and the stainless steel pipe that has been pickled can be taken out from the discharge pool one. In this way, in the process of taking and placing the stainless steel pipe, not only will the normal work of the whole be not affected, but time can also be saved, making the whole more convenient, flexible and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0016] Figure 2 It is a schematic diagram of the explosion structure of the utility model.

[0017] Figure 3 The utility model is a partial cutaway structural schematic diagram of a pickling tank.

[0018] Figure 4 It is a partial enlarged structural schematic diagram of point A of the utility model.

[0019] In the figure:

[0020] Pickling tank one 1, pickling tank two 2, U-shaped base 3, bearing mechanism 4, sealing plate 41, discharge tank one 42, discharge tank two 43, drain port 44, fixing ear 45, supporting leg 46, roller groove 47, roller 48, electric push rod 5, fixing seat 6, pump box 7, delivery pipe 8, filter plate 9, control box 10, feed port 11, acid storage chamber 12, partition 13, cavity 14, slide 15, nozzle 16, socket 17. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be described clearly and completely below. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0022] In the description of the embodiments, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0023] The utility model is further described below in conjunction with the accompanying drawings:

[0024] Embodiment 1

[0025] Reference Figure 1-4 , a stainless steel pipe acid self-circulating sealed pickling tank, comprising a pickling tank 1, a pickling tank 2 and a U-shaped base 3, wherein: the lower part between the pickling tank 1 and the pickling tank 2 is fixedly connected by the U-shaped base 3, and the stability between the pickling tank 1 and the pickling tank 2 can be ensured by the setting of the U-shaped base 3, and the pickling liquid dripping from the bearing mechanism 4 can be collected, and the upper part between the pickling tank 1 and the pickling tank 2 is slidably installed with a bearing mechanism 4, and the stainless steel pipes to be pickled can be placed by the setting of the bearing mechanism 4, and the driving mechanism is fixedly installed at both ends of the pickling tank 1, and the driving mechanism can be driven to carry the stainless steel pipe into the pickling tank 1 or the pickling tank 2 for pickling; the driving mechanism and the bearing mechanism 4 are fixedly connected;

[0026] A pickling liquid circulation mechanism is fixedly installed at one end below the pickling tank 1 and the pickling tank 2. Through the setting of the pickling liquid circulation mechanism, the pickling liquid in the corresponding pickling tank 1 and the pickling tank 2 can be driven to flow, so as to facilitate the full pickling of the stainless steel pipe. A feed port 11 is opened above the opposite side of the pickling tank 1 and the pickling tank 2. Through the setting of the feed port 11, the bearing mechanism 4 can be limited, and it is convenient for the bearing mechanism 4 to carry the stainless steel pipe into the pickling tank 1 or the pickling tank 2 for pickling; the bearing mechanism 4 is in the feed port 11 and is slidably connected to the feed port 11; two filter plates 9 are evenly installed on the pickling tank 1 and the pickling tank 2, and the filter plate 9 is in a drawer shape. Through the setting of the filter plate 9, when the pickling liquid circulation mechanism sucks the pickling liquid in the pickling tank 1 and the pickling tank 2, the impurities in the pickling liquid can be intercepted;

[0027] The bearing mechanism 4 includes a sealing plate 41, and a discharge tank 1 42 is fixedly installed on one side of the sealing plate 41, and a discharge tank 2 43 is fixedly installed on the other side of the sealing plate 41; the openings of the discharge tank 1 42 and the discharge tank 2 43 are both facing upward, and the stainless steel pipes that need to be pickled can be placed respectively through the arrangement of the discharge tank 1 42 and the discharge tank 2 43, so that they do not affect each other when taking and placing the stainless steel pipes, and the discharge tank 1 42 and the discharge tank 2 43 are respectively provided with a drainage port 44 at the bottom, and the pickling liquid in the discharge tank 1 42 and the discharge tank 2 43 can be discharged back to the corresponding pickling tank 1 and In the pickling tank 2, the discharge tank 1 42 and the discharge tank 2 43 are arranged in a mirror image position with the sealing plate 41 as the center; the sizes of the discharge tank 1 42 and the discharge tank 2 43 match the size of the feed port 11, and the discharge tank 1 42 is slidably connected to the feed port 11 on the pickling tank 2, and the discharge tank 2 43 is slidably connected to the feed port 11 on the pickling tank 1; the size of the sealing plate 41 is larger than the size of the feed port 11; the two ends of the sealing plate 41 are fixedly connected to the corresponding driving mechanism; an electromagnetic valve is fixedly installed inside the discharge port 44, and the discharge port 44 can be controlled to be on and off by setting the electromagnetic valve;

[0028] The driving mechanism includes an electric push rod 5 and a fixed seat 6, and the tail end of the electric push rod 5 shell is vertically fixedly connected to one side of the fixed seat 6. Through the setting of the electric push rod 5, the bearing mechanism 4 can be driven to move between the pickling tank 1 and the pickling tank 2. That is to say, when the electric push rod 5 drives the discharge tank 1 42 to enter the pickling tank 2, the discharge tank 2 43 will leak out of the pickling tank 1, and conversely, after the discharge tank 1 42 leaks out of the pickling tank 2, the discharge tank 2 43 will enter the pickling tank 1. The output end of the electric push rod 5 is fixedly connected to one end of the sealing plate 41; the electric push rod 5 and the sealing plate 41 are vertically arranged; the fixed seat 6 is fixedly connected to one end of the pickling tank 1. Through the setting of the fixed seat 6, the stability between the electric push rod 5 and the pickling tank 1 can be guaranteed.

[0029] A fixing ear 45 is fixedly installed at each end of the sealing plate 41. The setting of the fixing ear 45 can ensure the stability between the sealing plate 41 and the electric push rod 5, and two supporting legs 46 are evenly fixedly installed on both sides below the sealing plate 41. The setting of the supporting legs 46 can prevent the weight of the bearing mechanism 4 from directly acting on the electric push rod 5. A roller groove 47 is opened at the bottom of the supporting leg 46. The setting of the roller groove 47 can ensure the stability of the roller 48 during rotation; a roller 48 is rotatably installed in the roller groove 47. The setting of the roller 48 can reduce the friction between the bearing mechanism 4 and the U-shaped base 3, so that the electric push rod 5 can drive the bearing mechanism 4 to move between the pickling tank 1 and the pickling tank 2, and the roller 48 is in the U-shaped base 3, and the roller 48 is in rolling contact with the bottom surface inside the U-shaped base 3; the fixing ear 45 is fixedly connected to the output end of the corresponding electric push rod 5.

[0030] An acid storage chamber 12 is provided inside the pickling tank 1 and the pickling tank 2. The required pickling liquid can be stored by setting the acid storage chamber 12, and a partition 13 is fixedly installed inside the acid storage chamber 12. A cavity 14 is penetrated through the partition 13. The setting of the cavity 14 can reduce the overall weight; corresponding slide grooves 15 are provided at both ends of the partition 13 and on both sides of the acid storage chamber 12. The setting of the partition 13 and the slide groove 15 can support the corresponding filter plate 9 to ensure the stability of the filter plate 9; sockets 17 are evenly distributed on both sides of the outside of the pickling tank 1 and the pickling tank 2. The setting of the socket 17 makes it easy to take and place the filter plate 9, and the position of the socket 17 is consistent with the slide groove. 15 corresponds to the position of the jack 17, which is connected to the interior of the acid storage chamber 12; a plurality of nozzles 16 are evenly and fixedly installed above the interior of the acid storage chamber 12, and the pickling liquid can be evenly sprayed on the stainless steel pipe through the arrangement of the nozzles 16, and the nozzles 16 and the acid storage chamber 12 are fixedly connected and connected with the corresponding pickling liquid circulation mechanism; the feed port 11 is connected to the acid storage chamber 12, and the feed port 11 is above the partition 13, and the direction of the feed port 11 is consistent with the direction of the cavity 14; the filter plate 9 is installed in the corresponding slide groove 15 by plugging and unplugging the jack 17; the filter plate 9 and the corresponding jack 17 are sealed, such as installing a suitable sealing gasket on the contact surface of the filter plate 9 and the jack 17.

[0031] The pickling liquid circulation mechanism includes a pump box 7 and a delivery pipe 8, and the pump boxes 7 are fixedly installed below one end of the pickling tank 1 and the pickling tank 2. Through the setting of the pump box 7, the circulation pump inside it can be protected. A circulation pump is fixedly installed inside the pump box 7. Through the setting of the circulation pump, the pickling liquid inside the corresponding pickling tank 1 and the pickling tank 2 can be pumped into the corresponding delivery pipe 8; the liquid inlet end of the circulation pump is connected to the acid storage chamber 12 below the filter plate 9, and the liquid outlet end of the circulation pump is fixedly connected to one end of the delivery pipe 8. Through the setting of the delivery pipe 8, the pickling liquid can be delivered to the nozzle 16. The other end of the delivery pipe 8 is fixedly connected to the nozzle 16 inside the corresponding pickling tank 1 and the pickling tank 2, and is connected.

[0032] A control box 10 is fixedly installed on the outside of the pickling tank 1, and the controller inside the control box 10 is electrically connected to the electromagnetic valve, the electric push rod 5 and the circulation pump; the controller adopts existing technology, such as the single-chip microcomputer in the existing technology, so it will not be described in detail here.

[0033] In this embodiment, when pickling the stainless steel pipe, first put the stainless steel pipe that needs to be pickled in the discharge tank 1 42, and let the electric push rod 5 drive the discharge tank 1 42 to carry the stainless steel pipe through the feed port 11 on the pickling tank 2 2 into the pickling tank 2 2 for pickling. At this time, the sealing plate 41 will block the feed port 11 on the pickling tank 2 2, and the discharge tank 2 43 will leak out of the pickling tank 1. At this time, the stainless steel pipe that needs to be pickled can be put into the discharge tank 2 43. In this way, the stainless steel pipe in the discharge tank 1 42 After pickling in the pickling tank 2, the electric push rod 5 drives the discharge tank 1 42 to carry the stainless steel pipe out of the pickling tank 2 through the feed port 11 on the pickling tank 2. After the discharge tank 42 is moved out, the discharge tank 2 43 will carry the stainless steel pipe through the feed port 11 on the pickling tank 1 and directly enter the pickling tank 1 for pickling. At this time, the pickled stainless steel pipe can be taken out from the discharge tank 42, and after taking it out, the stainless steel pipe that needs to be pickled can be put in; finally, the cycle work is carried out in the above manner.

[0034] Utilizing the technical solution described in the utility model, or those skilled in the art designing similar technical solutions inspired by the technical solution of the utility model to achieve the above-mentioned technical effects, all fall within the protection scope of the utility model.

Claims

1. Acid self-circulating sealed pickling tank for stainless steel pipes, characterized by: The invention comprises a pickling tank 1 (1), a pickling tank 2 (2) and a U-shaped base (3), wherein: the pickling tank 1 (1) and the pickling tank 2 (2) are fixedly connected at the bottom through the U-shaped base (3), and a bearing mechanism (4) is slidably installed at the top between the pickling tank 1 (1) and the pickling tank 2 (2), and a driving mechanism is fixedly installed at each end of the pickling tank 1 (1); the driving mechanism is fixedly connected to the bearing mechanism (4); A pickling liquid circulation mechanism is fixedly installed at one end below the pickling tank 1 (1) and the pickling tank 2 (2), and a feed port (11) is opened above the opposite side of the pickling tank 1 (1) and the pickling tank 2 (2); the supporting mechanism (4) is located in the feed port (11) and is slidably connected to the feed port (11); two filter plates (9) are evenly installed on the pickling tank 1 (1) and the pickling tank 2 (2); The bearing mechanism (4) comprises a sealing plate (41), and a discharge tank 1 (42) is fixedly mounted on one side of the sealing plate (41), and a discharge tank 2 (43) is fixedly mounted on the other side of the sealing plate (41); the openings of the discharge tank 1 (42) and the discharge tank 2 (43) are both facing upward, and a discharge port (44) is respectively provided at the bottom of the discharge tank 1 (42) and the discharge tank 2 (43); the discharge tank 1 (42) is slidably connected to the feed port (11) on the pickling tank 2 (2), and the discharge tank 2 (43) is slidably connected to the feed port (11) on the pickling tank 1 (1); the two ends of the sealing plate (41) are fixedly connected to the corresponding driving mechanism; an electromagnetic valve is fixedly mounted inside the discharge port (44); The driving mechanism comprises an electric push rod (5) and a fixing seat (6), wherein the rear end of the outer shell of the electric push rod (5) is fixedly connected to a side surface of the fixing seat (6), and the output end of the electric push rod (5) is fixedly connected to one end of a sealing plate (41); and the fixing seat (6) is fixedly connected to one end of the pickling tank (1).

2. The acid liquid self-circulating sealed pickling tank for stainless steel pipes according to claim 1, characterized in that: A fixing ear (45) is fixedly installed at each end of the sealing plate (41), and two supporting legs (46) are evenly fixedly installed on both sides below the sealing plate (41), and a roller groove (47) is provided at the bottom of the supporting leg (46); a roller (48) is rotatably installed in the roller groove (47), and the roller (48) is located in the U-shaped base (3), and the roller (48) is in rolling contact with the bottom surface inside the U-shaped base (3); the fixing ear (45) is fixedly connected to the output end of the corresponding electric push rod (5).

3. The acid liquid self-circulating sealed pickling tank for stainless steel pipes according to claim 1, characterized in that: The pickling tank 1 (1) and the pickling tank 2 (2) are each provided with an acid storage chamber (12), and a partition (13) is fixedly installed inside the acid storage chamber (12), and a cavity (14) is penetrated through the partition (13); corresponding slide grooves (15) are respectively provided at both ends of the partition (13) and at both sides of the inside of the acid storage chamber (12); and plug holes (17) are evenly distributed on both sides of the outside of the pickling tank 1 (1) and the pickling tank 2 (2), and the positions of the plug holes (17) are consistent with the positions of the slide grooves (15). The positions correspond to each other, the socket (17) is connected to the interior of the acid liquid storage chamber (12); a plurality of nozzles (16) are evenly and fixedly installed above the interior of the acid liquid storage chamber (12), and the nozzles (16) and the acid liquid storage chamber (12) are fixedly connected and connected with the corresponding pickling liquid circulation mechanism; the feed port (11) is connected to the acid liquid storage chamber (12), and the feed port (11) is above the partition (13); the filter plate (9) is installed in the corresponding slide groove (15) by plugging and unplugging through the socket (17).

4. The acid liquid self-circulating sealed pickling tank for stainless steel pipes according to claim 3, characterized in that: The pickling liquid circulation mechanism comprises a pump box (7) and a delivery pipe (8), and the pump box (7) is fixedly installed below one end of the pickling tank one (1) and the pickling tank two (2), and a circulation pump is fixedly installed inside the pump box (7); the liquid inlet end of the circulation pump is communicated with the acid storage chamber (12) below the filter plate (9), and the liquid outlet end of the circulation pump is fixedly connected to one end of the delivery pipe (8), and the other end of the delivery pipe (8) is fixedly connected to and communicated with a nozzle (16) inside the corresponding pickling tank one (1) and the pickling tank two (2).

5. The acid liquid self-circulating sealed pickling tank for stainless steel pipes according to claim 4, characterized in that: A control box (10) is fixedly installed outside the pickling tank (1), and a controller inside the control box (10) is electrically connected to the electromagnetic valve, the electric push rod (5) and the circulation pump.