Cold-rolled strip steel surface cleaning system

Abstract

The utility model relates to the technical field of strip steel rolling, in particular to a cold-rolled strip steel surface cleaning system. Comprising a strip steel heating device, a pre-cleaning device, a first drying device, a degreasing cleaning device and a second drying device which are sequentially arranged in the running direction of strip steel, and the strip steel heating device is arranged at the discharging end of the continuous mill and provided with a heating cavity used for heating the strip steel. The strip steel heating device is arranged to heat the strip steel, physical properties of oil sludge attached to the surface of the strip steel are changed, viscosity is reduced, activity is improved, the oil sludge on the surface of the strip steel is in an easy-to-clean state, energy media such as water, electricity and a cleaning agent in the cleaning process can be effectively saved, and the service life of the strip steel is prolonged. The strip steel surface is cleaned twice to remove strip steel surface residues, the efficiency of removing the strip steel surface residues is high, the cleaning effect is good, the strip steel surface smoothness can be remarkably improved, and the strip steel surface residues are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of strip steel rolling, in particular to a cold-rolled strip steel surface cleaning system. Background Art

[0002] During the cold rolling process of steel strip, the friction between the strip steel in the roll gap and the working roll surface will generate a large amount of iron powder. Under the high pressure of the roll gap, these iron powders are pressed into the surface of the steel strip and form iron soap, which causes the surface of the steel strip to turn black. The adsorption of rolling oil and its saponification by iron powder increases the oil sludge on the surface of the steel strip. The surface residue of the finished steel strip produced by rolling is high and the surface cleanliness is poor, which seriously reduces the product grade. If these dirts are not cleaned, the quality of the subsequent coating layer will be affected.

[0003] Patent CN210657212U discloses a double electrolytic cleaning system for steel strips, including a pre-cleaning tank, a spray electrolytic cleaning tank, an alkaline solution brushing tank, an electrolytic cleaning tank, a hot water brushing tank and a rinsing tank. During the steel strip cleaning process, a large amount of cleaning agents, water, electricity, steam and other energy media are usually consumed, and a large amount of waste water is generated, resulting in high production costs and being unfriendly to the environment. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a cold-rolled strip surface cleaning system, comprising a strip heating device, a pre-cleaning device, a first drying device, a degreasing cleaning device and a second drying device which are arranged in sequence along the running direction of the strip. The strip heating device is arranged at the discharge end of the continuous rolling mill and is provided with a heating chamber for heating the strip.

[0005] Furthermore, the pre-cleaning device comprises a pre-cleaning tank, an emulsion pipeline and a nozzle for spray cleaning of the steel strip arranged in the pre-cleaning tank, and the emulsion pipeline is connected to the nozzle.

[0006] Furthermore, it also includes an emulsion filtering mechanism, the emulsion inlet of the emulsion filtering mechanism is connected to the emulsion outlet of the pre-cleaning tank, and the emulsion pipeline is connected to the clean emulsion outlet of the emulsion filtering mechanism.

[0007] Furthermore, the emulsion inlet of the emulsion filtering mechanism is connected to the emulsion outlet of the continuous rolling mill.

[0008] Furthermore, a squeezing device is provided between the pre-cleaning device and the first drying device and between the degreasing cleaning device and the second drying device.

[0009] Furthermore, the squeezing device comprises at least one set of squeezing rollers.

[0010] Furthermore, the first drying device comprises a first gas pipeline and a first purge assembly for purging the surface of the steel strip, and the first gas pipeline is connected to the first purge assembly.

[0011] Furthermore, the second drying device comprises a second gas pipeline and a second purge assembly for purging the surface of the steel strip, and the second gas pipeline is connected to the second purge assembly.

[0012] Furthermore, the degreasing and cleaning device comprises an alkaline cleaning mechanism, a brushing mechanism and a rinsing mechanism which are arranged in sequence.

[0013] Due to the adoption of the above technical solution, the utility model has the following beneficial effects compared with the prior art:

[0014] 1) The cold-rolled steel strip surface cleaning system provided by the utility model heats the steel strip by arranging a steel strip heating device, thereby changing the physical properties of the oil sludge attached to the surface of the steel strip, reducing the viscosity and increasing the activity, making the oil sludge on the surface of the steel strip in an easy-to-clean state, and can effectively save energy media such as water, electricity, and cleaning agents in the cleaning process. The surface of the steel strip is cleaned twice to remove the residue on the surface of the steel strip. The efficiency of removing the residue on the surface of the steel strip is high, the cleaning effect is good, the surface finish of the steel strip can be significantly improved, and the amount of residue on the surface of the steel strip can be reduced.

[0015] 2) The cold-rolled strip surface cleaning system provided by the utility model adopts emulsion for strong flushing in the pre-cleaning stage, which can remove more than 60% of the sludge and iron powder on the strip surface, and the flushed sludge and iron powder enter the emulsion filtering mechanism with the emulsion for filtration, and the emulsion can be recycled; the emulsion can be recycled with the emulsion in the continuous rolling mill, saving water consumption.

[0016] 3) The cold-rolled strip surface cleaning system provided by the utility model uses a squeezing device and a drying device between two cleaning sections to dry the strip surface, thereby avoiding cross-flow between the cleaning liquids of the two stages and affecting the cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 This is a schematic structural diagram of a cold-rolled strip steel surface cleaning system provided by the utility model. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. In the drawings, the size and relative size of some parts may be enlarged for clarity.

[0020] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connection" and "connected" should be interpreted in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] In the description of the present invention, terms such as "upper", "lower", "left", "right", "front", "backward", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying 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 present invention.

[0022] In addition, in the description of the present invention, the terms "first" and "second" are only used to distinguish in the description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0023] As the instruction manual Figure 1 As shown, the utility model provides a cold-rolled strip surface cleaning system, comprising a strip heating device 4, a pre-cleaning device 5, a first drying device 6, a degreasing cleaning device 7 and a second drying device 8 which are sequentially arranged along the running direction of the strip. The strip heating device 4 is arranged at the discharge end of the continuous rolling mill 1 and is provided with a heating chamber for heating the strip.

[0024] Specifically, after the steel strip 2 is processed in the continuous rolling mill 1 and before it runs to the next process, it needs to pass through the cleaning section to clean the dirt on the surface of the steel strip 2. A steel strip heating device 4, a pre-cleaning device 5, a first drying device 6, a degreasing cleaning device 7 and a second drying device 8 are arranged along the running direction of the steel strip. The steel strip 2 is output from the discharge end of the continuous rolling mill 1 and is heated by the steel strip heating device 4. The heating temperature of the steel strip heating device 4 is 50-100°C, and an induction heating device is preferably used. After the steel strip 2 is heated, the sludge properties of the sludge attached to the surface of the steel strip 2 can be changed, the viscosity of the sludge can be reduced and its activity can be increased, so that the sludge on the surface of the steel strip 2 is in a state that is easy to clean. Then, the pre-cleaning device 5 is used for pre-cleaning, which can remove more than 60% of the sludge and iron powder on the surface of the steel strip. Then, the steel strip 2 enters the degreasing cleaning device 7 to further clean the residue on the surface of the steel strip 2, which can further remove the sludge and iron powder on the surface of the steel strip 2, reduce the amount of cleaning liquid used in the degreasing cleaning section, reduce waste liquid discharge, and reduce environmental pollution.

[0025] According to the optimized implementation mode, the pre-cleaning device 5 comprises a pre-cleaning tank, an emulsion pipeline and a nozzle for spray cleaning of the steel strip 2 arranged in the pre-cleaning tank, and the emulsion pipeline is connected to the nozzle; a strip running channel is formed before the strip inlet and the strip outlet of the pre-cleaning tank, and in order to facilitate the flushing of the upper and lower surfaces of the steel strip 2, nozzles are provided above and below the strip running channel, and the upper and lower surfaces of the steel strip 2 can be strongly flushed respectively, and the nozzle is connected to an emulsion pipeline for providing emulsion, and the surface of the steel strip 2 is strongly flushed with emulsion, and the emulsion is used to strongly flush the surface of the steel strip 2, and the emulsion spray pressure is 0.5-1MPa, preferably 0.7MPa, which can remove more than 60% of the sludge and iron powder on the surface of the steel strip 2, and the steel strip 2 enters the degreasing cleaning device 7 for further cleaning.

[0026] Of course, in addition to the emulsion, the cleaning liquid in the pre-cleaning device 5 can also use water or alkaline solution as the cleaning liquid to rinse the surface of the heated strip steel 2.

[0027] An optimized implementation method is as follows: in the pre-cleaning stage, under the flushing of the emulsion, the sludge and iron powder attached to the surface of the steel strip 2 are mixed into the emulsion. In order to recycle the emulsion, the emulsion is filtered and then recycled. The cleaning system also includes an emulsion filtering mechanism, the emulsion inlet of the emulsion filtering mechanism is connected to the emulsion outlet of the pre-cleaning tank, the emulsion pipeline is connected to the clean emulsion outlet of the emulsion filtering mechanism, the clean emulsion filtered by the emulsion filtering mechanism is sent to the nozzle through the emulsion pipeline to flush the steel strip, the flushed emulsion in the pre-cleaning tank is recovered to the emulsion filtering mechanism for filtration, and then the emulsion can be reused, which can effectively save costs and recover the iron powder flushed from the steel strip; preferably, a circulating pump can be arranged on the emulsion pipeline.

[0028] Preferably, the steel strip 2 is lubricated and cooled with emulsion in the cold rolling section. The emulsion used in the pre-cleaning stage can come from the steel strip cold rolling section. The emulsion inlet of the emulsion filtering mechanism is connected to the emulsion outlet of the continuous rolling mill 1. The emulsion in the pre-cleaning stage comes from the emulsion in the cold rolling stage or is shared with the emulsion in the cold rolling stage, which can save the amount of cleaning liquid in the pre-cleaning stage.

[0029] In an optimized implementation mode, a squeezing device 3 is provided between the pre-cleaning device 5 and the first drying device 6 and between the degreasing cleaning device 7 and the second drying device 8; preferably, a squeezing device 3 is also provided between the continuous rolling mill 1 and the strip heating device 4.

[0030] The squeezing device 3 includes at least one group of squeezing rollers. Preferably, the squeezing device 3 between the continuous rolling mill 1 and the strip heating device 4 is a two-roll squeezing roller device, and the squeezing pressure stress is 2 to 6 MPa, preferably 5 MPa; the squeezing device 3 between the pre-cleaning device 5 and the first drying device 6 is a four-roll squeezing roller device, and the squeezing pressure stress is 2 to 6 MPa and 0.2 to 1 MPa, preferably 5 MPa and 0.6 MPa; the squeezing device 3 between the degreasing cleaning device 7 and the second drying device 8 is a two-roll squeezing roller device, and the squeezing pressure stress is 2 to 6 MPa, preferably 3 MPa.

[0031] In an optimized implementation mode, the first drying device 6 includes a first gas pipeline and a first purge assembly for purging the surface of the steel strip, and the first gas pipeline is connected to the first purge assembly; after the steel strip 2 is pre-cleaned, before entering the degreasing and cleaning section, the emulsifier on the surface of the steel strip is first removed by a squeezing device, and then the surface of the steel strip 2 is dried by the first drying device 6. The first gas is preferably compressed air, and the compressed air is used to purge and dry the surface of the steel strip, and the compressed air purging pressure is 0.2-0.6MPa, preferably 0.4MPa.

[0032] The steel strip 2 dried by the first drying device 6 enters the degreasing cleaning device 7 for further cleaning. The degreasing cleaning device 7 includes an alkali cleaning mechanism 71, a brushing mechanism 72 and a rinsing mechanism 73 arranged in sequence. The alkali cleaning mechanism 71 includes a nozzle for spraying an alkaline cleaning liquid to rinse the surface of the steel strip 2 to further remove the residual oil on the surface of the steel strip 2. The alkali cleaning is preferably NaOH and / or KOH solution. In the present application, the alkali cleaning adopts a mixed solution of NaOH and KOH, the NaOH concentration is 15-30 g / L, the KOH concentration is 2-5 g / L, and the alkali cleaning temperature is 70-80°C; the steel strip 2 after alkali cleaning enters the brushing mechanism for brushing to further remove the residual oil on the surface of the steel strip 2 and clean the iron powder on the surface of the steel strip 2; the steel strip 2 after brushing enters the rinsing mechanism 73 to clean the residual alkali liquid on the surface of the steel strip 2. The degreasing cleaning device 7 can further remove the sludge and iron powder on the surface of the steel strip, and the rinsing water temperature is 75-85°C.

[0033] Preferably, according to actual usage, the number of the alkali washing mechanism 71, the brush washing mechanism 72 and the rinsing mechanism 73 can be set to two or more to improve the cleaning efficiency of the steel strip.

[0034] In an optimized implementation mode, the second drying device 8 includes a second gas pipeline and a second purge assembly for purging the surface of the steel strip 2, and the second gas pipeline is connected to the second purge assembly; the second gas pipeline is preferably purged with hot air, and the hot air drying temperature is 70 to 90°C to remove residual moisture on the surface of the steel strip.

[0035] The working principle of the present application is that after the steel strip 2 is rolled by the continuous rolling mill 1, the emulsion remaining on the surface of the steel strip 2 at the roller gap outlet is squeezed out by the squeezing device 3, and then the steel strip 2 is continuously heated by the steel strip heating device 4 to increase the activity of the oil sludge on the surface of the steel strip 2 and reduce the stickiness of the surface residue to the steel strip 2, and then the pre-cleaning device 5 is used to quickly rinse the surface of the steel strip 2, and the washed out oil sludge and iron powder enter the emulsion filtering mechanism with the emulsion for filtration, and then the steel strip passes through the squeezing device 3 (four-roll squeezing roller device) for two consecutive squeezes to remove as much as possible. The emulsion on the surface of the steel strip 2 is squeezed out, and then the steel strip enters the first drying device 6 for drying treatment to remove the residual emulsion droplets on the surface of the steel strip 2 to prevent the formation of emulsion spots on the surface of the steel strip. Then the steel strip enters the degreasing cleaning device 7 for alkaline washing, brushing and rinsing in sequence, wherein the alkaline washing is used to further remove the residual oil on the surface of the steel strip, the brushing is used to further remove the residual oil on the surface of the steel strip and clean the iron powder on the surface of the steel strip, and the rinsing is used to clean the residual alkaline solution on the surface of the steel strip. Finally, the steel strip is squeezed out by the squeezing device 3 and enters the second drying device 8 for hot air drying to remove the residual moisture on the surface of the steel strip 2.

[0036] After the strip is cleaned by the cleaning system of the present application, the surface finish of the strip is significantly improved, the reflectivity of the tape can reach more than 80%, and the surface residue is less than 200mg / m 2 Single-sided.

[0037] Those skilled in the art will appreciate that the present invention can be implemented in many other specific forms without departing from the spirit and scope of the present invention. Although the embodiments of the present invention have been described, it should be understood that the present invention should not be limited to this embodiment, and those skilled in the art can make changes and modifications within the spirit and scope of the present invention as defined by the attached claims.

Claims

1. A cold-rolled strip surface cleaning system, characterized in that: It comprises a strip heating device, a pre-cleaning device, a first drying device, a degreasing cleaning device and a second drying device which are sequentially arranged along the running direction of the strip. The strip heating device is arranged at the discharge end of the continuous rolling mill and is provided with a heating chamber for heating the strip.

2. The cold-rolled strip surface cleaning system according to claim 1, characterized in that: The pre-cleaning device comprises a pre-cleaning tank, an emulsion pipeline and a nozzle arranged in the pre-cleaning tank for spray cleaning of the steel strip, and the emulsion pipeline is connected to the nozzle.

3. The cold-rolled strip surface cleaning system according to claim 2, characterized in that: It also includes an emulsion filtering mechanism, the emulsion inlet of the emulsion filtering mechanism is connected to the emulsion outlet of the pre-cleaning tank, and the emulsion pipeline is connected to the clean emulsion outlet of the emulsion filtering mechanism.

4. The cold-rolled strip surface cleaning system according to claim 3, characterized in that: The emulsion inlet of the emulsion filtering mechanism is connected to the emulsion outlet of the continuous rolling mill.

5. The cold-rolled strip surface cleaning system according to claim 1, characterized in that: A squeezing device is provided between the pre-cleaning device and the first drying device and between the degreasing cleaning device and the second drying device.

6. The cold-rolled steel strip surface cleaning system according to claim 5, characterized in that: The squeezing device comprises at least one set of squeezing rollers.

7. The cold-rolled strip surface cleaning system according to claim 1, characterized in that: The first drying device comprises a first gas pipeline and a first purge assembly for purge the surface of the steel strip, and the first gas pipeline is connected to the first purge assembly.

8. The cold-rolled strip surface cleaning system according to claim 1, characterized in that: The second drying device comprises a second gas pipeline and a second purge assembly for purge the surface of the steel strip, and the second gas pipeline is connected to the second purge assembly.

9. The cold-rolled steel strip surface cleaning system according to claim 1, characterized in that: The degreasing and cleaning device comprises an alkaline cleaning mechanism, a brushing mechanism and a rinsing mechanism which are arranged in sequence.

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