A strip cleaning system and method with reduced water consumption

Abstract

The application provides a strip steel cleaning system and method with reduced water consumption, which comprises a water brushing unit, a rinsing unit, a brushing water circulating tank, a rinsing water circulating tank and a high-pressure rinsing water circulating tank. The water brushing unit is connected with the brushing water circulating tank to form a first circulating system. The rinsing unit comprises a plurality of rinsing sub-basins connected in series. The last rinsing sub-basin in the rinsing unit along the running direction of the strip steel is connected with the high-pressure rinsing water circulating tank to form a third circulating system. The remaining rinsing sub-basins are connected with the brushing water circulating tank to form a second circulating system. The high-pressure rinsing water circulating tank, the rinsing water circulating tank and the brushing water circulating tank are connected in sequence and form a cascade overflow. The high-pressure rinsing water circulating tank, the rinsing water circulating tank and the brushing water circulating tank are connected in sequence to form a cascade overflow. The rinsing water in the circulating tank of the later stage is introduced into the circulating tank of the former stage for repeated use, which greatly saves the consumption of rinsing water, improves the utilization efficiency of the rinsing water and further improves the cleaning quality.

Description

Technical Field

[0001] This invention belongs to the field of strip steel cleaning technology, specifically relating to a strip steel cleaning system and method that reduces water consumption. Background Technology

[0002] Strip steel surface cleaning is a core step in the cold rolling process, typically achieved by alkaline washing followed by rinsing. However, current technologies suffer from low rinsing water utilization and high rinsing water consumption, resulting in poor rinsing quality and high demineralized water consumption – common problems. Therefore, a strip steel cleaning system and method to reduce water consumption is needed. Summary of the Invention

[0003] The purpose of this invention is to provide a strip steel cleaning system that reduces water consumption, which can at least solve some of the defects existing in the prior art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A strip steel cleaning system for reducing water consumption includes a water brushing unit, a rinsing unit, a brushing water circulation tank, a rinsing water circulation tank, and a high-pressure rinsing water circulation tank. The water brushing unit and the brushing water circulation tank are connected to form a first circulation system. The rinsing unit includes multiple rinsing sub-tanks connected in series. The last rinsing sub-tank in the rinsing unit along the strip steel running direction and the high-pressure rinsing water circulation tank form a third circulation system. The remaining rinsing sub-tanks and the brushing water circulation tank form a second circulation system. The high-pressure rinsing water circulation tank, the rinsing water circulation tank, and the brushing water circulation tank are connected sequentially to form a tiered overflow.

[0006] Furthermore, the rinsing water circulation tank is divided into multiple rinsing water zones by at least one overflow baffle, and each rinsing water zone corresponds one-to-one with the remaining rinsing sub-tanks in the rinsing unit except for the last rinsing sub-tank to form a sub-circulation system.

[0007] Furthermore, the scrubbing water circulation tank is provided with a first overflow port and a first connecting port, the rinsing water circulation tank is provided with a second overflow port, a second connecting port and a third connecting port, and the high-pressure rinsing water circulation tank is provided with a third overflow port and a fourth connecting port; the first connecting port and the second connecting port are connected by a connecting pipe, and the third connecting port and the fourth connecting port are connected by a connecting pipe.

[0008] Furthermore, the elevation h1 of the first overflow port, the elevation h2 of the first and second connecting ports, the elevation h3 of the second overflow port, the elevation h4 of the third connecting port and the fourth connecting port, and the elevation h5 of the third overflow port satisfy the following relationship: H > h5 > h3 > h4, and h3 > h1 > h2 > 1 / 2H, where H is the height of the scrubbing water circulation tank, the rinsing water circulation tank, and the high-pressure rinsing water circulation tank.

[0009] Furthermore, the high-pressure rinsing water circulation tank is connected to a rinsing water replenishment pipe and a conductivity meter. The rinsing water replenishment pipe is equipped with a water replenishment shut-off valve. Both the high-pressure rinsing water circulation tank and the brushing water circulation tank are equipped with level gauges. The water replenishment shut-off valve is interlocked with the conductivity of the high-pressure rinsing water circulation tank and the level of the high-pressure rinsing water circulation tank and the brushing water circulation tank.

[0010] Furthermore, the bottom of the scrubbing water circulation tank is connected to the pit via a waste discharge pipe, and a waste discharge shut-off valve is provided on the waste discharge pipe.

[0011] Furthermore, the outlet end of the water washing unit and the outlet end of each of the rinsing sub-tanks are equipped with squeeze rollers.

[0012] Furthermore, the pump head of the first circulation system and the second circulation system is 20-60m, and the pump head of the third circulation system is 60-250m.

[0013] In addition, the present invention also provides a strip steel cleaning method with reduced water consumption, which adopts the above-mentioned strip steel cleaning system with reduced water consumption and includes the following process:

[0014] The strip steel is sequentially washed and rinsed by a water washing unit and a rinsing unit.

[0015] During the scrubbing process, the scrubbing water circulation tank provides scrubbing water to the water scrubbing unit, and the scrubbing water after scrubbing flows back into the scrubbing water circulation tank.

[0016] During the rinsing process, the rinsing water circulation tank and the high-pressure rinsing water circulation tank provide rinsing water to each rinsing sub-tank of the rinsing unit, and the rinsing water after rinsing flows back to the corresponding rinsing water circulation tank / high-pressure rinsing water circulation tank.

[0017] The rinsing water in the high-pressure rinsing water circulation tank overflows into the rinsing water circulation tank, and the rinsing water in the rinsing water circulation tank overflows into the scrubbing water circulation tank.

[0018] Furthermore, a water supply shut-off valve is connected to the high-pressure rinsing water circulation tank. The water supply shut-off valve is interlocked with the conductivity of the high-pressure rinsing water circulation tank and the liquid level in both the high-pressure rinsing water circulation tank and the scrubbing water circulation tank. The interlocking control process is as follows:

[0019] When the liquid level in the high-pressure rinsing water circulation tank or the brushing water circulation tank is detected to be lower than the set low liquid level L, the water supply shut-off valve opens to supply water to the set high liquid level H.

[0020] When the conductivity exceeds the set high value HH, the water supply shut-off valve opens until the conductivity is less than the set low value LL; even if the liquid level of the high-pressure rinsing water circulation tank or the brushing water circulation tank is detected to be at the high liquid level H, water is forcibly supplied to replace the rinsing water.

[0021] When the water level in the washing water circulation tank reaches the set high point H value, the bottom wastewater shut-off valve opens and automatically discharges wastewater.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] (1) The strip cleaning system provided by the present invention is designed with a high-pressure rinsing water circulation tank, a rinsing water circulation tank and a brushing water circulation tank to form a stepped overflow in sequence. The rinsing water in the next circulation tank enters the previous circulation tank for reuse, which greatly saves rinsing water consumption, improves rinsing water utilization efficiency, and thus improves cleaning quality.

[0024] (2) The strip steel cleaning system provided by the present invention achieves mechanical overflow of rinsing water by designing different elevations of the connecting ports and overflow ports on each circulating tank. According to the elevation specification, the connecting pipe is located in the upper part of each circulating tank, which effectively avoids the dirty medium at the bottom of the tank flowing to the previous stage. At the same time, each circulating tank is designed to be an atmospheric pressure overflow form, which effectively avoids the risk of pressure expansion of the circulating tank due to the heating medium.

[0025] (3) The strip cleaning system provided by the present invention achieves automatic and efficient control of rinsing by designing a water supply shut-off valve, conductivity and liquid level interlock control, thereby improving the stability of the rinsing process.

[0026] The present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the strip cleaning system in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram showing the connection of the high-pressure rinsing water circulation tank, the rinsing water circulation tank, and the scrubbing water circulation tank in an embodiment of the present invention.

[0029] Explanation of reference numerals in the attached drawings: 1. Strip steel; 2. Brushing unit; 3. Rinsing unit; 4. Rinsing sub-tank; 5. Squeeze roller; 6. Brushing water circulation tank; 7. Waste discharge shut-off valve; 8. Level gauge; 9. Rinsing water circulation tank; 10. Overflow baffle; 11. High-pressure rinsing water circulation tank; 12. Circulation pump; 13. Conductivity meter; 14. Make-up water shut-off valve; 15. Connecting pipe. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection", and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an abutting connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0034] like Figure 1As shown, this embodiment provides a strip steel cleaning system with reduced water consumption, including a water brushing unit 2, a rinsing unit 3, a brushing water circulation tank 6, a rinsing water circulation tank 9, and a high-pressure rinsing water circulation tank 11; the water brushing unit 2 and the brushing water circulation tank 6 are connected to form a first circulation system, the rinsing unit 3 includes multiple rinsing sub-tanks 4 connected in series, the last rinsing sub-tank 4 along the running direction of the strip steel 1 in the rinsing unit 3 and the high-pressure rinsing water circulation tank 11 form a third circulation system, the remaining rinsing sub-tanks 4 and the brushing water circulation tank 9 form a second circulation system, and the high-pressure rinsing water circulation tank 11, the rinsing water circulation tank 9 and the brushing water circulation tank 6 are connected in sequence to form a stepped overflow.

[0035] Each circulation system (i.e., the first, second, and third circulation systems) consists of a circulation tank, a circulation pump 12, and pipelines. To ensure that the rinsing water in each circulation tank can be smoothly pumped to the corresponding water washing unit 2 / rinsing unit 3, the head of the circulation pump 12 in each circulation system can be selected according to actual needs. In this embodiment, the head of the circulation pump 12 in the first and second circulation systems is designed to be 20-60m, and the head of the circulation pump 12 in the third circulation system is 60-250m. Optimally, the return pipeline of each circulation system is inserted into the lower part of the corresponding circulation tank and is located away from the suction inlet of the circulation pump 12.

[0036] Preferably, the last stage of the rinsing unit 3, the rinsing sub-tank 4, is designed as a high-pressure rinsing tank, which can thoroughly remove the residues on the surface of the strip steel. At the same time, high-pressure rinsing can enhance water circulation and prevent the strip steel 1 from being re-contaminated with pollutants at the outlet end, thus ensuring the stability of the cleaning effect.

[0037] In this embodiment, for ease of subsequent description, the last rinsing sub-tank 4 along the running direction of the strip 1 is defined as the high-pressure rinsing sub-tank. During operation, the rinsing water in the rinsing water circulation tank 6 is pumped to the water rinsing unit 2 by the circulation pump 12 to rinse the strip 1. At the same time, the rinsing water in the water rinsing unit 2 flows back to the rinsing water circulation tank 6, and so on. The rinsing water in the rinsing water circulation tank 9 is pumped to the rinsing sub-tank 4 before the high-pressure rinsing sub-tank in the rinsing unit 3 by the circulation pump 12 to rinse the strip 1 after it has been rinsed by the water rinsing unit 2. The rinsing water then flows back to the rinsing water circulation tank 9, and so on. The high-pressure rinsing water circulation... The rinsing water in the ring tank 11 is pumped by the circulation pump 12 to the high-pressure rinsing sub-tank to rinse the strip steel 1. The rinsed water then flows back to the high-pressure rinsing water circulation tank 11, and this cycle repeats. Simultaneously, the high-pressure rinsing water circulation tank 11, rinsing water circulation tank 9, and brushing water circulation tank 6 form a tiered overflow system. The rinsing water in the high-pressure rinsing water circulation tank 11 overflows into the rinsing water circulation tank 9, and the rinsing water in the rinsing water circulation tank 9 overflows into the brushing water circulation tank 6. This process of reusing rinsing water from the next circulation tank significantly reduces rinsing water consumption, improves rinsing water utilization, and ultimately enhances cleaning quality. Optionally, demineralized water can be used for both brushing and rinsing.

[0038] In the optimized implementation, for the form of multiple rinsing sub-tanks 4 before the high-pressure rinsing sub-tank in the rinsing unit 3, the rinsing water circulation tank 9 is designed to be divided into multiple rinsing water zones by at least one overflow baffle 10, and each rinsing water zone corresponds one-to-one with the remaining rinsing sub-tanks 4 in the rinsing unit 3 except for the last rinsing sub-tank 4 to form a sub-circulation system. Furthermore, the rinsing water in the next rinsing water zone can overflow over the overflow baffle 10 and enter the previous rinsing water zone for reuse, further improving the rinsing water utilization rate.

[0039] A specific implementation method for the sequential cascading overflow of high-pressure rinsing water circulation tank 11, rinsing water circulation tank 9, and scrubbing water circulation tank 6 is as follows: Figure 2As shown, the scrubbing water circulation tank 6 is provided with a first overflow port A1 and a first connecting port B1; the rinsing water circulation tank 9 is provided with a second overflow port A2, a second connecting port B2, and a third connecting port B3; and the high-pressure rinsing water circulation tank 11 is provided with a third overflow port A3 and a fourth connecting port B4. The first connecting port B1 and the second connecting port B2 are connected by a connecting pipe, and the third connecting port B3 and the fourth connecting port B4 are connected by a connecting pipe 15. The connecting ports on each circulation tank are used to connect with adjacent circulation tanks, allowing rinsing water from the next circulation tank to overflow into the previous circulation tank for reuse. The overflow ports on each circulation tank are used for overflowing rinsing water from the circulation tank for waste discharge, and it is ensured that the connecting pipe 15 is located above the middle of the circulation tank body, and that each circulation tank preferentially overflows into the previous circulation tank before discharging waste through the overflow port.

[0040] Specifically, the elevation h1 of the first overflow port A1, the elevation h2 of the first connecting port B1 and the second connecting port B2, the elevation h3 of the second overflow port A2, the elevation h4 of the third connecting port B3 and the fourth connecting port B4, the elevation h5 of the third overflow port A3, and the elevation h6 of the overflow baffle 10 satisfy the following relationship: H > h5 > h3 > h4, and h3 > h1 > h2 > 1 / 2H, and h5 > h6; where H is the height of the scrubbing water circulation tank 6, the rinsing water circulation tank 9, and the high-pressure rinsing water circulation tank 11. This design, with different elevations for the connecting ports and overflow ports on each circulation tank, achieves mechanical overflow of rinsing water. Furthermore, according to the elevation specifications, the connecting pipe 15 is located in the upper part of each circulation tank, effectively preventing dirty media from flowing from the bottom of the tank to the previous stage. In this embodiment, the rinsing water in each circulation tank is mechanically overflowed from the next circulation tank to the previous circulation tank. Each circulation tank can be designed to overflow at normal pressure, which effectively avoids the risk of pressure buildup and expansion of the circulation tank due to the heating medium.

[0041] In the optimized implementation, the high-pressure rinsing water circulation tank 11 is connected to a rinsing water replenishment pipe and a conductivity meter 13. The rinsing water replenishment pipe is equipped with a water replenishment shut-off valve 14. Both the high-pressure rinsing water circulation tank 11 and the brushing water circulation tank 6 are equipped with level gauges 8. The water replenishment shut-off valve 14 is interlocked with the conductivity of the high-pressure rinsing water circulation tank 11 and the level of the high-pressure rinsing water circulation tank 11 and the brushing water circulation tank 6.

[0042] Specifically, the interlocking control process between the water supply shut-off valve 14 and the conductivity of the high-pressure rinsing water circulation tank 11, as well as the liquid levels in the high-pressure rinsing water circulation tank 11 and the brushing water circulation tank 6, is as follows: When the liquid level in the high-pressure rinsing water circulation tank 11 or the brushing water circulation tank 6 is detected to be lower than the set low liquid level L, the water supply shut-off valve 14 opens to supply water up to the set high liquid level H; when the conductivity exceeds the set high value HH, the water supply shut-off valve 14 opens until the conductivity is less than the set low value LL; even if the liquid level in the high-pressure rinsing water circulation tank 11 or the brushing water circulation tank 6 is detected to be at the high liquid level H, forced water supply is used to replace the rinsing water; when the liquid level in the brushing water circulation tank reaches the set high liquid level H, the bottom wastewater shut-off valve 7 opens to automatically discharge wastewater. In this embodiment, by designing the interlocking control of the water supply shut-off valve 14, conductivity, and liquid level, automatic and efficient control of rinsing is achieved, improving the stability of the rinsing process.

[0043] Optionally, the bottom of the scrubbing water circulation tank 6 is connected to the pit via a waste discharge pipe, and the waste discharge pipe is equipped with a waste discharge shut-off valve 7. When the liquid level display of the scrubbing water circulation tank 6 exceeds the set high liquid level H value, the waste discharge shut-off valve 7 of the scrubbing water circulation tank 6 automatically opens at the bottom to start discharging waste, and closes the waste discharge shut-off valve 7 when the scrubbing water level H value in the scrubbing water circulation tank 6 is reached. Optimally, the bottom of the scrubbing water circulation tank 6 is designed with a conical structure to facilitate the settling of solid substances in the scrubbing water.

[0044] In some embodiments, multiple sets of washing rollers are arranged sequentially at intervals along the running direction of the strip steel in the water washing unit 2. Each set of washing rollers has washing nozzles on both sides for spraying washing water onto the washing surface. These washing nozzles are connected to the washing water circulation tank 6. Preferably, a set of squeezing rollers 5 is provided at the outlet end of the water washing unit to squeeze the washed strip steel 1 dry, so that the washing water can be returned to the washing water circulation tank 6 to the maximum extent possible.

[0045] In some embodiments, the rinsing unit 3 is divided into multiple series rinsing sub-tanks 4 by multiple spaced partitions along the running direction of the strip 1. Multiple sets of rinsing nozzles are spaced along the running direction of the strip 1 in each rinsing sub-tank 4 to spray rinsing water onto the upper and lower surfaces of the strip 1 for rinsing. These rinsing nozzles are connected to corresponding rinsing water zones in the rinsing water circulation tank 9. Preferably, a squeeze roller 5 is provided at the outlet end of each rinsing sub-tank 4 to squeeze the rinsed strip 1 dry, thereby maximizing the reuse of rinsing water. Furthermore, two sets of squeeze rollers 5 can be provided at the outlet end of the last rinsing sub-tank 4. During unit operation, the squeeze rollers 5 of the water washing unit 2 and each rinsing sub-tank 4 are pressed down, and at least one set of the two pairs of squeeze rollers 5 at the outlet of the last rinsing sub-tank 4 is pressed down.

[0046] The following example illustrates the specific process of the strip steel cleaning system in this embodiment cleaning strip steel 1, using a three-stage series rinsing sub-tanks 4 in the rinsing unit 3, and the rinsing water circulation tank 9 being divided into two-stage rinsing water zones by an overflow baffle 10.

[0047] Demineralized water (i.e., rinse water) is added to the high-pressure rinse water circulation tank 11 through the TOP point. After recycling, a portion overflows mechanically through the connection ports B3 / B4 to the previous circulation tank (i.e., rinse water circulation tank 9). In the rinse water circulation tank 9, the rinse water then overflows over the overflow baffle 10 at a high level and mechanically overflows to the first stage of the rinse water circulation tank 9. It then mechanically overflows through the connection ports B1 / B2 to the brush water circulation tank 6. The above systems circulate independently. When the conductivity value of the rinse water in the high-pressure rinse water circulation tank 11 is detected to be higher than the set value, the water supply shut-off valve 14 is automatically opened to add demineralized water. The rinse water is mechanically overflowed into the rinse water circulation tank 9 and the brush water circulation tank 6 through the liquid level. When the liquid level display of the brush water circulation tank 6 exceeds the set high liquid level value, the waste discharge shut-off valve 7 of the brush water circulation tank 6 automatically opens to discharge waste at the bottom until the brush water liquid level reaches the set high liquid level value, at which point the waste discharge shut-off valve 7 closes.

[0048] The above examples are merely illustrative of the present invention and do not constitute a limitation on the scope of protection of the present invention. All designs that are the same as or similar to the present invention are within the scope of protection of the present invention.

Claims

1. A method for cleaning steel strips with reduced water consumption, characterized in that, A strip steel cleaning system with reduced water consumption is adopted. The strip steel cleaning system includes a water brushing unit, a rinsing unit, a brushing water circulation tank, a rinsing water circulation tank, and a high-pressure rinsing water circulation tank. The water brushing unit and the brushing water circulation tank are connected to form a first circulation system. The rinsing unit includes multiple rinsing sub-tanks connected in series. The last rinsing sub-tank in the rinsing unit along the strip steel running direction and the high-pressure rinsing water circulation tank form a third circulation system. The remaining rinsing sub-tanks and the brushing water circulation tank form a second circulation system. The high-pressure rinsing water circulation tank, the rinsing water circulation tank, and the brushing water circulation tank are connected sequentially to form a tiered overflow. The scrubbing water circulation tank is provided with a first overflow port and a first connecting port; the rinsing water circulation tank is provided with a second overflow port, a second connecting port, and a third connecting port; the high-pressure rinsing water circulation tank is provided with a third overflow port and a fourth connecting port; the first connecting port and the second connecting port are connected by a connecting pipe, and the third connecting port and the fourth connecting port are connected by a connecting pipe; the elevation h1 of the first overflow port, the elevation h2 of the first and second connecting ports, the elevation h3 of the second overflow port, the elevation h4 of the third connecting port and the fourth connecting port, and the elevation h4 of the third overflow port are also specified. The elevation h5 of the opening satisfies the following relationship: H > h5 > h3 > h4, and h3 > h1 > h2 > 1 / 2H, where H is the height of the scrubbing water circulation tank, the rinsing water circulation tank, and the high-pressure rinsing water circulation tank; the high-pressure rinsing water circulation tank is connected to a rinsing water replenishment pipe and a conductivity meter, the rinsing water replenishment pipe is equipped with a water replenishment shut-off valve, and both the high-pressure rinsing water circulation tank and the scrubbing water circulation tank are equipped with level gauges; the water replenishment shut-off valve is interlocked with the conductivity of the high-pressure rinsing water circulation tank and the level of the high-pressure rinsing water circulation tank and the scrubbing water circulation tank. This method includes the following steps: The strip steel is sequentially washed and rinsed by a water washing unit and a rinsing unit. During the scrubbing process, the scrubbing water circulation tank provides scrubbing water to the water scrubbing unit, and the scrubbing water after scrubbing flows back into the scrubbing water circulation tank. During the rinsing process, the rinsing water circulation tank and the high-pressure rinsing water circulation tank provide rinsing water to each rinsing sub-tank of the rinsing unit, and the rinsing water after rinsing flows back to the corresponding rinsing water circulation tank / high-pressure rinsing water circulation tank. The rinsing water in the high-pressure rinsing water circulation tank overflows into the rinsing water circulation tank, and the rinsing water in the rinsing water circulation tank overflows into the scrubbing water circulation tank. The high-pressure rinsing water circulation tank is equipped with a water supply shut-off valve. The water supply shut-off valve is interlocked with the conductivity of the high-pressure rinsing water circulation tank and the liquid level in both the high-pressure rinsing water circulation tank and the scrubbing water circulation tank. The interlocking control process is as follows: When the liquid level in the high-pressure rinsing water circulation tank or the brushing water circulation tank is detected to be lower than the set low liquid level L, the water supply shut-off valve opens to supply water to the set high liquid level H. When the conductivity exceeds the set high value HH, the water supply shut-off valve opens until the conductivity is less than the set low value LL; even if the liquid level of the high-pressure rinsing water circulation tank or the brushing water circulation tank is detected to be at the high liquid level H, water is forcibly supplied to replace the rinsing water. When the water level in the washing water circulation tank reaches the set high point H value, the bottom wastewater shut-off valve opens and automatically discharges wastewater.

2. The strip steel cleaning method for reducing water consumption as described in claim 1, characterized in that: The rinsing water circulation tank is divided into multiple rinsing water zones by at least one overflow baffle, and each rinsing water zone corresponds one-to-one with the remaining rinsing sub-tanks in the rinsing unit except for the last rinsing sub-tank, forming a sub-circulation system.

3. The strip steel cleaning method for reducing water consumption as described in claim 1, characterized in that: The bottom of the washing water circulation tank is connected to the pit via a waste discharge pipe, and a waste discharge shut-off valve is provided on the waste discharge pipe.

4. The strip steel cleaning method for reducing water consumption as described in claim 1, characterized in that: The outlet end of the water washing unit and the outlet end of each of the rinsing sub-tanks are equipped with squeeze rollers.

5. The strip steel cleaning method for reducing water consumption as described in claim 1, characterized in that: The pump head of the first and second circulation systems is 20-60m, and the pump head of the third circulation system is 60-250m.

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