Anti-cutting device for pickling tank and pickling tank

Abstract

The invention discloses an anti-cutting device for a pickling tank and the pickling tank. The anti-cutting device comprises a saddle, a roller core and a roller assembly. The two saddles are oppositely arranged; two ends of the roller core are respectively arranged on the two saddles; the roller assembly is arranged on the periphery of the roller core; according to the roller assembly, a first roller is arranged in the middle of a roller core; the plurality of second rollers are arranged at the two ends of the roller core; the length of the first roller is greater than that of the second roller; and a gap between the adjacent first roller and second roller is 2.5-3.5 mm. Compared with the prior art, the pickling tank can be prevented from being cut by strip steel, and the pickling tank is long in service life and convenient to replace.

Description

Technical Field

[0001] The present invention relates to the technical field of pickling equipment maintenance, and in particular to a cut-proof device for a pickling tank and the pickling tank. Background Art

[0002] Pickling tanks are widely used in modern cold-rolled stainless steel enterprises. To obtain a high-quality strip surface, the strip needs to be passivated through pickling. According to the characteristics of the production line, the pickling section mainly consists of four parts, namely the pre-pickling section, the first mixed acid section, the second mixed acid section, and the rinse section. PPH pickling tanks play an irreplaceable role in current cold-rolled stainless steel enterprises. However, during the pickling process, the strip often cuts into the acid tank body, causing the tank to crack, the unit to shut down, and acid leakage to corrode equipment. How to protect the tank from being cut, extend the tank life, and reduce downtime losses is particularly important.

[0003] During the production process, the pickling tank will be filled with mixed acid liquid, and the strip will be completely immersed in the acid liquid. Due to factors such as differences in strip shape, thickness, production speed, and production tension, if the tension is too high, the strip will break at the weak point, and if the tension is too low, the strip will fall and cut the equipment. The hardness of the PPH mixed acid tank is lower than that of the strip. When the strip falls during operation or deviates from the center of the roller and forms an angle with the roller surface, it will cut into the tank. When the tank is cut through, the machine needs to be stopped and the tank needs to be repaired by welding. Each shutdown operation takes more than 9 hours, which will affect the production of the unit.

[0004] The recovery process of acid leakage when the strip is cut into the tank body is as follows: (1) Cleaning process: drain the acid liquid in the tank into the acid storage tank for storage. After the acid mist in the tank is completely absorbed, open the tank cover and rinse the acid mud accumulated in the tank and the strip body. First clean the accumulated water, and then use an electric planer to grind and cut the cracked area to meet the welding process requirements. This process takes 4 hours; (2) Strip overlap process: cut off the deformed strip and the strip embedded in the tank body. This process takes 0.5 hours; (3) Tank welding process: due to the small space between the tank body and the tank body steel structure, double-sided welding cannot be used. Only single-sided welding can be used inside the tank body. The size of the cracked tank body gap is determined by the multi-pass welding. Each welding requires a certain time interval. The next welding can be carried out only after the weld has cooled. This process takes 2.5 hours. (4) Strip lap process: Use a narrow strip to bridge the broken strip, and finally weld the two ends firmly. This process takes 1 hour. (5) Test run process: After cleaning the site for 5 seconds, use a centrifugal pump to supply acid from the acid tank to the acid tank to test the pressure of the repair point. If there is no acid leakage at the leaking point, start production. This process takes 1 hour. If there is acid leakage at the leaking point due to poor welding, repeat steps (1), (2), (3), (4), and (5).

[0005] The acid liquid is prepared in the acid tank to a concentration that meets the requirements of the strip pickling process, and the acid liquid is transported to the mixed acid tank through a circulation pump. The strip passes through the middle of the tank and is completely covered by the acid liquid. Part of the acid liquid flows back to the acid tank through the overflow port. Oxide accumulation will gradually occur in the acid tank after pickling and passivation.

[0006] Generally speaking, the width of the strip is 800mm-1350mm, and the thickness of the strip is 0.03mm-5.0mm. During the production process, due to factors such as different strip tensioning forces set for different strip gauges, different production speeds, and differences in versions, the strip will sag with its own gravity, with the lowest point 127mm away from the bottom of the trough. The high-speed running strip is circulated and flushed by acid at a pressure of 4.3Mpa in a 26-meter-long PPH acid tank, causing the strip to often deviate from the center of the trough. The strip shakes unstably and repeatedly under the impact of the acid medium, forming an angle of about 30 degrees. The PPH trough is often cut by high-speed and sharp strips. In severe cases, the trough is cut and acid leaks, causing shutdown. The safety control risk is high, and the time to resume production is at least 9 hours, which has a certain impact on the company's unit production and a shutdown loss of about 111,700 yuan per time.

[0007] Therefore, it is necessary to improve the pickling tank. Summary of the Invention

[0008] The first technical problem to be solved by the present invention is to provide a long-life anti-cutting device for a pickling tank in response to the above-mentioned technical status quo, which can prevent the pickling tank from being cut by the strip steel.

[0009] The second technical problem to be solved by the present invention is to provide a pickling tank in response to the above technical status quo.

[0010] The technical solution adopted by the present invention to solve the first technical problem is: a cut-proof device for a pickling tank, characterized in that it includes:

[0011] Saddles, having two and arranged opposite each other;

[0012] The roller core has two ends respectively mounted on two saddles;

[0013] The roller assembly is arranged on the outer periphery of the roller core;

[0014] The roller assembly comprises:

[0015] The first roller is arranged in the middle of the roller core;

[0016] The second roller has multiple parts and is arranged at both ends of the roller core; the length of the first roller is greater than that of the second roller; and the gap between adjacent first rollers and second rollers is 2.5-3.5 mm.

[0017] To increase the flexibility of the first roller, preferably, there are multiple first rollers, and the gap between two adjacent first rollers is 2.5-3.5 mm. A gap less than 2.5 mm will make the first roller difficult to rotate, while a gap greater than 3.5 mm will cause the first roller to slip. Both non-rotation and slipping will cause the first roller to wear rapidly.

[0018] In order to balance the flexibility of the first roller and the second roller and the supporting effect on the strip steel, preferably, the length of each first roller is 180-0 mm; the length of each second roller is 80-120 mm.

[0019] Preferably, the number of the first rollers is four, and the number of the second rollers is eight.

[0020] In order to prevent acid water corrosion and provide sufficient support force through stainless steel parts, preferably, the roller core includes:

[0021] The roller body is a hollow cylindrical body; the roller body is a polyvinylidene fluoride part;

[0022] The roller shaft is located inside the roller body and is made of stainless steel. Polyvinylidene fluoride is not easily corroded by acid water, while stainless steel is strong and can provide greater support for the anti-cut device to prevent it from breaking under the impact of the strip.

[0023] In order to increase the supporting effect of the anti-cutting device on the strip steel and prevent the anti-cutting device from being displaced as a whole during use, preferably, the saddle includes:

[0024] The base has a mounting groove with an opening at the top, and the two ends of the roller core are respectively arranged in the mounting grooves of the two bases; the mounting grooves are arranged obliquely;

[0025] The reinforcing rib is arranged at the bottom of the base.

[0026] Preferably, the two saddles are arranged symmetrically to each other.

[0027] The technical solution adopted by the present invention to solve the second technical problem is: a pickling tank with the above-mentioned anti-cutting device, characterized in that: the pickling tank includes:

[0028] A trough body having an opening at the top;

[0029] The anti-cutting device is arranged in the groove body and is provided in plurality. The anti-cutting device extends along the width direction of the groove body.

[0030] In order to prevent the strip steel from hitting the bottom of the pickling tank and to balance the structural strength, anti-cut effect and construction cost, preferably, there are four anti-cut devices, and the anti-cut devices are distributed at intervals along the length direction of the tank body. The anti-cut devices are sequentially recorded along the length direction of the tank body as the first anti-cut device, the second anti-cut device, the third anti-cut device and the fourth anti-cut device.

[0031] Preferably, the distance between the first anti-cut device and the second anti-cut device is 2.8-3.2 m; the distance between the third anti-cut device and the fourth anti-cut device is 2.8-3.2 m.

[0032] The long and short rollers are arranged according to the regular size of the steel belt.

[0033] Compared with the prior art, the advantages of the present invention are:

[0034] ① The length of the first roller is greater than that of the second roller. The long first roller is basically not worn in the middle of the strip and is used to support the strip. The short second roller contacts the edge of the strip and is easily cut and worn by the edge of the strip. The shorter the second roller, the more flexible it is in rotation, and the shorter the second roller, the lower the replacement cost after wear. The rollers can be replaced individually without having to directly replace the entire anti-cut device.

[0035] ② The gap between adjacent first and second rollers is 2.5-3.5mm. This gap allows for more flexible coordination between the first and second rollers. During use, the first and second rollers can move closer to or further apart, providing a buffer for the movement of the strip. Furthermore, it prevents the first and second rollers from getting stuck or deforming during use, extending their service life.

[0036] ③ There are two saddles arranged opposite to each other, which can support the strip steel. The center point of the anti-cut device is not easy to shift, and will not affect the position of the strip steel during the pickling process. The strip steel remains in the middle position of the anti-cut device, thereby preventing the edge of the strip steel from cutting the pickling tank wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Schematic diagram of the structure of the anti-cutting device of the embodiment;

[0038] Figure 2 A schematic structural diagram of a saddle according to an embodiment;

[0039] Figure 3 Schematic diagram of the structure of the pickling tank of the embodiment. DETAILED DESCRIPTION

[0040] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0041] like Figure 1-2The figure shows a preferred embodiment of the present invention. A cut-proof device for a pickling tank comprises a saddle 1, a roller core 2 and a roller assembly 3.

[0042] The saddle 1 has two symmetrical parts; the saddle 1 includes a base 11 and a reinforcing rib 13; the base 11 has a mounting groove 12 with an open top, and the two ends of the roller core 2 are respectively arranged in the mounting grooves 12 of the two bases 11; the mounting grooves 12 are arranged at an angle; the reinforcing rib 13 is arranged at the bottom of the base 11, and the base 11 is U-shaped.

[0043] The roller core 2 is mounted on two saddles 1 at each end. The roller core 2 comprises a roller body and a roller shaft. The roller body is a hollow cylindrical structure made of polyvinylidene fluoride. The roller shaft is located inside the roller body and is made of stainless steel.

[0044] The roller assembly 3 is arranged on the outer periphery of the roll core 2; the roller assembly 3 includes a first roller 4 and a second roller 5. The first roller 4 is located in the center of the roll core 2; multiple second rollers 5 are provided at both ends of the roll core 2. The length of the first roller 4 is greater than that of the second roller 5; the gap between adjacent first rollers 4 and second rollers 5 is 3 mm. There are multiple first rollers 4, and the gap between adjacent first rollers 4 is 3 mm (the gap is not shown in the figure). Each first roller 4 is 200 mm long; each second roller 5 is 100 mm long. There are four first rollers 4 and eight second rollers 5. The inner diameter of the first roller 4 is D1, the inner diameter of the second roller 5 is D2, and the outer diameter of the roll core is D3. D1 = D2 > D3. Furthermore, D1 - D3 = 2.8-3.2 mm. Under these inner diameter conditions, the first roller 4 and second roller 5 can be driven to rotate when the strip passes through.

[0045] like Figure 3 As shown, this embodiment also provides a pickling tank, which includes a tank body 200 and an anti-cut device 100. The tank body 200 has an opening at the top; the anti-cut device 100 is arranged in the tank body 200 and has multiple anti-cut devices 100, and the anti-cut devices 100 extend along the width direction of the tank body 200. There are four anti-cut devices 100, and the anti-cut devices 100 are distributed at intervals along the length direction of the tank body 200. The anti-cut devices 100 are sequentially recorded as the first anti-cut device, the second anti-cut device, the third anti-cut device, and the fourth anti-cut device along the length direction of the tank body 200. The distance between the first anti-cut device and the second anti-cut device is 2.8-3.2m; the distance between the third anti-cut device and the fourth anti-cut device is 2.8-3.2m.

[0046] When installing the anti-cut device 100 in the pickling tank, first weld the base 11 to the vertical body of the pickling tank, then install the first roller 4 and the second roller 5 on the outside of the roller core 2, and finally place the roller core 2 with the first roller 4 and the second roller 5 in the installation groove 12.

Claims

1. A cut-proof device for a pickling tank, characterized in that: include: Two saddles (1) are arranged opposite to each other; The roller core (2) has two ends respectively disposed on the two saddles (1); A roller assembly (3) is arranged on the outer periphery of the roller core (2); The roller assembly (3) comprises: A first roller (4) is arranged in the middle of the roller core (2); The second roller (5) has multiple rollers and is arranged at both ends of the roller core (2); the length of the first roller (4) is greater than the length of the second roller (5); and the gap between adjacent first rollers (4) and second rollers (5) is 2.5-3.5 mm.

2. The anti-cutting device for a pickling tank according to claim 1, characterized in that: There are multiple first rollers (4), and the gap between two adjacent first rollers (4) is 2.5-3.5 mm.

3. The anti-cutting device for a pickling tank according to claim 2, characterized in that: The length of each of the first rollers (4) is 180-0 mm; the length of each of the second rollers (5) is 80-120 mm.

4. The anti-cutting device for a pickling tank according to claim 2, characterized in that: The number of the first rollers (4) is four, and the number of the second rollers (5) is eight.

5. The anti-cutting device for a pickling tank according to claim 1, characterized in that: The roller core (2) comprises: The roller body is a hollow cylindrical body; the roller body is a polyvinylidene fluoride part; The roller shaft is arranged in the roller body, and the roller shaft is a stainless steel part.

6. The anti-cutting device for a pickling tank according to claim 1, characterized in that: The saddle (1) comprises: The base (11) has a mounting groove (12) with a top opening, and the two ends of the roller core (2) are respectively arranged in the mounting grooves (12) of the two bases (11); the mounting grooves (12) are arranged obliquely; The reinforcing rib (13) is arranged at the bottom of the base (11).

7. The anti-cutting device for a pickling tank according to claim 1, characterized in that: The two saddles (1) are arranged symmetrically to each other.

8. A pickling tank having the anti-cutting device according to any one of claims 1 to 7, characterized in that: The pickling tank comprises: A trough body (200) having an opening at the top; The anti-cutting device (100) is arranged in the trough body (200) and has a plurality of anti-cutting devices (100), and the anti-cutting device (100) extends along the width direction of the trough body (200).

9. The pickling tank according to claim 8, characterized in that: The anti-cutting devices (100) have four anti-cutting devices (100), which are distributed at intervals along the length direction of the trough body (200). The anti-cutting devices (100) are sequentially recorded as a first anti-cutting device, a second anti-cutting device, a third anti-cutting device, and a fourth anti-cutting device along the length direction of the trough body (200).

10. The pickling tank according to claim 9, characterized in that: The distance between the first anti-cut device and the second anti-cut device is 2.8-3.2 m; the distance between the third anti-cut device and the fourth anti-cut device is 2.8-3.2 m.

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