Pickling tank based on free roller sealing

Abstract

The utility model relates to a pickling bath based on free roller sealing, which comprises a bath body, at least one end of the bath body is a liquid separation end, the liquid separation end is provided with an overflow dam and a free roller, the overflow dam extends upwards from the bath bottom, the free roller is arranged above a strip running channel in a floating mode, and the free roller is arranged above the strip running channel. The top end of the overflow dam and the bottom end of the free roller are close to the strip running channel, and the distance between the overflow dam and the free roller allows the strip to pass through. According to the pickling tank provided by the utility model, the liquid separation end consisting of the overflow dam and the free roller is arranged, so that a liquid level with a certain height is always kept above the strip running channel, the strip can be fully soaked in the acid liquid no matter how the draping degree of the strip is, and the pickling effect of the strip is ensured. Due to the fact that the free roller is arranged in a floating mode and can float up and down along with shaking of the strip, sealing reliability and the service life of the free roller can be guaranteed, and damage to the strip is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of pickling, and in particular relates to a pickling tank based on free roller sealing. Background Art

[0002] In the field of strip pickling, the pickling tank is a key process equipment. The strip is immersed in a pickling tank filled with acid at a certain temperature. After passing through the pickling tank at a certain speed, the iron oxide scale on the surface of the strip is removed under the chemical action of the acid. In order to ensure that the iron oxide scale on the surface of the strip can be completely removed at the maximum process speed, it is necessary to design a reasonable pickling tank length according to the required pickling time.

[0003] One of the current mainstream pickling tanks is a turbulent shallow tank, such as Figure 1 As shown, its characteristic is that by setting an inner cover, the acid is filled in a relatively closed and shallow cavity, and a number of andesite or wear-resistant plates are set at the bottom of the cavity, so that the running track of the strip in the pickling device is almost a straight line. In order to ensure that the cavity is always full of acid, a large nozzle is set at the inlet and outlet of the cavity. The acid with a certain pressure is converted into a high-speed jet through the nozzle in the nozzle, and continuously enters the cavity from the inlet and outlet of the cavity, thereby realizing the liquid seal of the acid on the upper surface of the strip in the cavity, so that a large amount of acid can only flow out from the overflow weir in the middle of the cavity.

[0004] Another common pickling tank is a shallow tank without an inner cover, such as Figure 2 As shown, it is characterized by a simple structure without an inner cover. The acid enters the tank through the acid inlet distributed along the strip passing line on the side wall of the tank. The strip is immersed in the acid by hanging, and the acid flows out from both ends of the tank by overflow.

[0005] The first type of turbulent shallow tank relies on the large nozzles at the inlet and outlet to seal the acid liquid. However, when producing products such as silicon steel that are easy to produce impurities in the acid liquid, the nozzles on the nozzles are prone to clogging. As the amount of acid liquid sprayed decreases, the tank body will eventually not be filled with acid liquid, resulting in pickling failure and defective products. At the same time, the high-speed jets continuously sprayed from the large nozzles at the inlet and outlet will produce a large amount of acid mist in the process of hitting the acid liquid. Since there are squeeze rollers in this area, a mist extraction port must be set. Therefore, with the discharge of a large amount of acid mist, not only will the acid liquid be lost, but the treatment of the acid mist to meet the standards will increase the operating cost of the unit. The second type of turbulent shallow tank has no large nozzles at the inlet and outlet. It relies on the sag of the strip to be immersed in the acid liquid. However, during the operation of the unit, the tension of the strip fluctuates to a certain extent. Especially when the tension control is not appropriate, the sag of the strip is not enough, resulting in only part of the strip being in direct contact with the acid liquid, resulting in insufficient pickling time and insufficient pickling, which brings serious quality problems.

[0006] Chinese patent application CN201910795397.0 discloses an energy-saving and environment-friendly pickling device and strip processing system. By setting a liquid isolation end composed of a supporting dam and a liquid blocking dam, a relatively closed cavity for storing acid is formed inside the pickling tank. This method can eliminate the nozzle used for liquid sealing; however, it either has the problem of insufficient sealing due to the large distance between the supporting dam and the liquid blocking dam, or has the problem of easy scratching of the strip due to the small distance between the supporting dam and the liquid blocking dam. Utility Model Content

[0007] The utility model relates to a pickling tank based on free roller sealing, which can at least solve some defects of the prior art.

[0008] The utility model relates to a pickling tank based on free roller sealing, comprising a tank body, at least one end of the tank body being a liquid isolation end, the liquid isolation end being provided with an overflow dam and a free roller, the overflow dam extending upward from the tank bottom, the free roller being floatingly arranged above a strip running channel, the top end of the overflow dam and the bottom end of the free roller being respectively close to the strip running channel and the distance between the two allowing the strip to pass through.

[0009] As one of the implementation modes, a limiting slide rail is provided on the side wall of the trough body, the guiding direction of the limiting slide rail is parallel to the vertical direction, and the bearing seat of the free roller is slidably arranged on the limiting slide rail.

[0010] As one of the embodiments, a thermal expansion gap is provided between at least one bearing seat of the free roller and the corresponding side wall of the groove body.

[0011] As one of the implementation modes, the static distance between the top end of the overflow dam and the bottom end of the free roller is adjustable.

[0012] As one of the implementation modes, the bearing seat of the free roller is provided with an adjusting gasket set, wherein the adjusting gasket is detachably mounted on the bottom of the bearing seat, or the adjusting gasket is placed on the free roller mounting portion of the tank body.

[0013] As one of the implementation modes, the free roller is a rubber roller, and the rubber roller comprises a roller core and an outer lining layer, and the outer lining layer is a wear-resistant and corrosion-resistant rubber layer.

[0014] As one of the implementation modes, the shaft sleeve of the free roller used to cooperate with the bearing seat is a graphite shaft sleeve.

[0015] As one of the implementation modes, an overflow trough for collecting the acid liquid flowing out from the end is connected to the outer side of the liquid isolation end, and an acid liquid reflux port is provided on the overflow trough.

[0016] The utility model has at least the following beneficial effects:

[0017] The pickling tank provided by the utility model is provided with a liquid isolation end composed of an overflow dam and a free roller, which can ensure that there is always a certain height of liquid level above the strip running channel. No matter how the strip sags, the strip can be fully immersed in the acid solution to ensure the pickling effect of the strip. Since it is no longer necessary to use a high-speed jet to seal the pickling tank, a large amount of acid mist will not be generated, thereby reducing acid consumption and the cost of subsequent treatment of acid mist; at the same time, since there is no nozzle for liquid sealing, the adaptability of the pickling tank will be greatly enhanced, avoiding the situation when pickling varieties such as silicon steel, such as the high impurity content in the acid solution, resulting in nozzle blockage, the acid tank will not be filled with acid solution, and the pickling failure will be avoided.

[0018] Due to the floating setting of the free roller, it can float up and down with the shaking of the strip, which can ensure the sealing reliability and the service life of the free roller and avoid damage to the strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 and Figure 2 Structural schematic diagrams of two turbulent shallow troughs provided as background technology;

[0021] Figure 3 A schematic diagram of the structure of a pickling tank provided in an embodiment of the utility model;

[0022] Figure 4 A schematic structural diagram of a free roller provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] like Figure 3The utility model embodiment provides a pickling tank based on free roller 2 sealing, including a tank body 1, at least one end of the tank body 1 is a liquid isolation end, the liquid isolation end is provided with an overflow dam 3 and a free roller 2, the overflow dam 3 extends upward from the bottom of the tank, the free roller 2 is floatingly arranged above the strip running channel, the top end of the overflow dam 3 and the bottom end of the free roller 2 are respectively close to the strip running channel and the distance between the two allows the strip to pass.

[0025] The trough body 1 may be the first type of turbulent shallow trough with a trough cover as described in the background art, or the second type of turbulent shallow trough without a trough cover.

[0026] Preferably, if Figure 3 The outer side of the liquid barrier end is connected to an overflow trough 5 for collecting the acid liquid flowing out from the end. The overflow trough 5 is provided with an acid liquid reflux port, and the acid liquid collected in the overflow trough 5 can flow out through the acid liquid reflux port for recycling in the pickling tank. Among them, the bottom of the overflow trough 5 is preferably lower than the top of the overflow dam 3, and it is further preferred that the bottom of the overflow trough 5 is lower than the bottom of the pickling tank, which is convenient for the collection and reflux of the acid liquid. Furthermore, an end mist outlet is also provided on the overflow trough 5 to prevent the acid mist from overflowing from the overflow trough 5.

[0027] Preferably, both ends of the tank body 1 are liquid isolating ends.

[0028] The free roller 2 comprises a roller body 11 and a bearing seat 12 . The roller body 11 is provided with a sleeve matched with the bearing seat 12 .

[0029] Preferably, the roller body 11 is a rubber roller, which includes a roller core and an outer lining layer, and the outer lining layer is a wear-resistant and corrosion-resistant rubber layer. The roller core can be a steel roller; the outer lining layer is made of wear-resistant and corrosion-resistant rubber, which can better adapt to the pickling environment and withstand the friction of the strip steel, and is further preferably resistant to high temperature. The wear-resistant and corrosion-resistant rubber layer includes but is not limited to Hebron rubber.

[0030] The bearing seat 12 is preferably made of a polymer material having good corrosion resistance, for example, a polymer material consistent with the tank body 1 is used.

[0031] The shaft sleeve is preferably made of acid-resistant, wear-resistant and high-temperature resistant materials, including but not limited to graphite shaft sleeves. Further, the free roller 2 is configured with a rotating shaft sleeve 13 and a fixed shaft sleeve 14, wherein both the rotating shaft sleeve 13 and the fixed shaft sleeve 14 can be made of graphite shaft sleeves.

[0032] The above-mentioned free roller 2 is preferably located directly above the overflow dam 3, wherein the top of the overflow dam 3 is preferably flush with the bottom end of the strip running channel at the corresponding position, and in the initial state / static state, the bottom end of the free roller 2 (that is, the bottom end of the roller body 11) is preferably flush with the top end of the strip running channel at the corresponding position; the static spacing between the top of the overflow dam 3 and the bottom end of the free roller 2 matches the thickness of the strip being produced (the same or basically the same, based on the floating properties of the free roller 2, it is also feasible that the spacing between the two is slightly smaller than the thickness of the strip being produced).

[0033] Further preferably, the static distance between the top of the overflow dam 3 and the bottom of the free roller 2 is adjustable, which can meet the pickling requirements of strips of different thicknesses and ensure the sealing effect of the liquid isolation end, thereby improving the working reliability of the pickling tank. As a feasible method: Figure 4 The bearing seat 12 of the free roller 2 is provided with an adjusting gasket set, wherein the adjusting gasket 15 is detachably mounted on the bottom of the bearing seat 12 , or the adjusting gasket 15 is placed on the mounting portion of the free roller 2 of the tank body 1 .

[0034] In one embodiment, the floating of the free roller 2 is achieved in the following manner:

[0035] like Figure 3 A limiting slide rail 4 is provided on the side wall of the trough body, the guiding direction of the limiting slide rail 4 is parallel to the vertical direction, and the bearing seat 12 of the free roller 2 is slidably arranged on the limiting slide rail 4.

[0036] The limiting rail 4 can be installed on the side wall of the tank body by welding or other fixing methods. Generally, limiting rails are respectively arranged on the side walls of the tank body on both sides, and the bearing seats 12 at both ends of the free roller 2 are respectively slidably matched with the limiting rails on both sides.

[0037] A travel limiter is provided on the limit slide rail 4 / side wall of the tank body to limit the descending travel of the free roller 2, that is, to determine the static position of the free roller 2. When the static spacing between the top of the overflow dam 3 and the bottom of the free roller 2 is designed to be adjustable, the height position of the travel limiter can also be adjusted to achieve the purpose of adjusting the static spacing.

[0038] In one of the embodiments, a thermal expansion gap is provided between at least one bearing seat 12 of the free roller 2 and the corresponding side wall of the tank body, so as to better adapt to the temperature environment in the pickling tank and avoid failure of the free roller 2 due to thermal stress.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pickling tank based on free roller sealing, comprising a tank body, at least one end of which is a liquid isolation end, characterized in that: The liquid isolation end is provided with an overflow dam and a free roller, the overflow dam extends upward from the bottom of the groove, and the free roller is floatingly arranged above the strip running channel. The top end of the overflow dam and the bottom end of the free roller are respectively close to the strip running channel and the distance between the two allows the strip to pass.

2. The pickling tank based on free roller sealing according to claim 1, characterized in that: A limiting slide rail is arranged on the side wall of the trough body, the guiding direction of the limiting slide rail is parallel to the vertical direction, and the bearing seat of the free roller is slidably arranged on the limiting slide rail.

3. The pickling tank based on free roller sealing according to claim 1 or 2, characterized in that: A thermal expansion gap is provided between at least one bearing seat of the free roller and the side wall of the groove body on the corresponding side.

4. The pickling tank based on free roller sealing according to claim 1, characterized in that: The static spacing between the top end of the overflow weir and the bottom end of the free roller is adjustable.

5. The pickling tank based on free roller sealing according to claim 4, characterized in that: The bearing seat of the free roller is equipped with an adjusting gasket set, wherein the adjusting gasket is detachably mounted on the bottom of the bearing seat, or the adjusting gasket is placed on the free roller mounting portion of the trough body.

6. The pickling tank based on free roller sealing according to claim 1, characterized in that: The free roller is a rubber roller, which comprises a roller core and an outer lining layer, and the outer lining layer is a wear-resistant and corrosion-resistant rubber layer.

7. The pickling tank based on free roller sealing according to claim 1, characterized in that: The shaft sleeve of the free roller used for matching with the bearing seat is a graphite shaft sleeve.

8. The pickling tank based on free roller sealing according to claim 1, characterized in that: The outer side of the liquid isolation end is connected with an overflow trough for collecting the acid liquid flowing out from the end, and the overflow trough is provided with an acid liquid reflux port.

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