CN114210747B - Method for improving production efficiency of precision strip steel cleaning unit - Google Patents
Method for improving production efficiency of precision strip steel cleaning unit Download PDFInfo
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- CN114210747B CN114210747B CN202210159481.5A CN202210159481A CN114210747B CN 114210747 B CN114210747 B CN 114210747B CN 202210159481 A CN202210159481 A CN 202210159481A CN 114210747 B CN114210747 B CN 114210747B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0269—Cleaning
Abstract
The invention belongs to the technical field of stainless steel strip surface cleaning, and particularly relates to a method for improving the production efficiency of a precision strip steel cleaning unit. The method for improving the production efficiency of the precision strip steel cleaning unit sequentially comprises the following steps: high-pressure spray degreasing, brushing degreasing, rinsing, squeezing and drying. In the high-pressure spraying degreasing process, the spraying pressure of a nozzle is 0.7-1.1MPa, and the vector included angle between cleaning liquid sprayed by the nozzle and the running direction of the steel strip is 90-130 degrees. The method for improving the production efficiency of the precision strip steel cleaning unit provided by the invention has the advantages that the running speed of a steel strip in the cleaning process is improved to 47-55m/min, no pulling and correcting white marks or steel strip corrosion defects exist on the surface of the steel strip, and the connection requirement between production processes after the speed of a rolling mill is increased is met.
Description
Technical Field
The invention belongs to the technical field of stainless steel strip surface cleaning, and particularly relates to a method for improving the production efficiency of a precision strip steel cleaning unit.
Background
The precise strip steel cleaning unit is mainly used for removing residual grease and impurities on the surface of a steel strip on the lower line of a rolling mill. On the premise of accelerating the rolling mill, the cleaning unit must improve the production efficiency to ensure the connection between production processes. In the process of improving the production efficiency of the cleaning unit, the problems of withdrawal and straightening white marks or corrosion of a steel belt caused by incomplete degreasing exist, and the higher requirement is provided for the degreasing efficiency of the cleaning unit.
Disclosure of Invention
The invention aims to provide a method for improving the production efficiency of a precision strip steel cleaning unit aiming at the defects of the prior art.
Specifically, the method for improving the production efficiency of the precision strip steel cleaning unit sequentially comprises a high-pressure spray degreasing process, a scrubbing degreasing process, a rinsing process, a squeezing process and a drying process, wherein in the high-pressure spray degreasing process, the injection pressure of a nozzle is 0.7-1.1MPa, and the vector included angle between cleaning liquid sprayed out of the nozzle and the running direction of a steel strip is 90-130 degrees.
In the method for improving the production efficiency of the precision strip steel cleaning unit, in the high-pressure spraying degreasing process, the spraying pressure of the nozzles is 0.8 MPa, and the vector included angle between the cleaning liquid sprayed out of the nozzles and the running direction of the strip steel is 120 degrees.
According to the method for improving the production efficiency of the precision strip steel cleaning unit, the mass ratio of the degreasing agent to the degreasing assistant in the cleaning liquid is (2-4): 1, the electric conductivity of the degreasing agent is 16-24 ms/cm.
According to the method for improving the production efficiency of the precision strip steel cleaning unit, the mass ratio of the degreasing agent to the degreasing auxiliary agent in the cleaning liquid is 3:1, the conductivity of the degreasing agent is 20 ms/cm.
In the method for improving the production efficiency of the precision strip steel cleaning unit, in the brushing and degreasing process, the brushing current is 8-14A.
In the method for improving the production efficiency of the precision strip steel cleaning unit, in the brushing and degreasing process, the brushing current is 11.8A.
In the method for improving the production efficiency of the precision strip steel cleaning unit, in the brushing and degreasing process, the cleaning solution is sprayed on one side of a tangent point of the brush roller and the strip steel along the rotation direction of the brush roller.
In the method for improving the production efficiency of the precision strip steel cleaning unit, in the squeezing process, the squeezing roller is made of polyurethane rubber.
According to the method for improving the production efficiency of the precision strip steel cleaning unit, the Shore hardness of the drying roller is 70 +/-5.
According to the method for improving the production efficiency of the precision strip steel cleaning unit, in the drying process, the axial flow fan is adopted to sweep the steel strip treated by the dryer.
According to the method for improving the production efficiency of the precision strip steel cleaning unit, the axial flow fan is arranged at the outlet of the dryer, and the top of the axial flow fan is higher than the position of the steel strip.
According to the method for improving the production efficiency of the precision strip steel cleaning unit, the number of the axial flow fans is two.
According to the method for improving the production efficiency of the precision strip steel cleaning unit, the running speed of the steel strip is 47-55 m/min.
According to the method for improving the production efficiency of the precision strip steel cleaning unit, the running speed of the steel strip is 50 m/min.
The technical scheme of the invention has the following beneficial effects:
(1) the method for improving the production efficiency of the precision strip steel cleaning unit improves the production efficiency of the cleaning unit on the premise of ensuring stable production quality;
(2) according to the method for improving the production efficiency of the precision strip steel cleaning unit, the running speed of a steel strip in the cleaning process is improved to 47-55m/min by optimizing the proportion of a cleaning agent, adjusting the high-pressure spraying pressure and the spraying angle, optimizing the nozzle angle in a brushing machine and the control mode of a brush roller, adjusting the material of a squeezing roller, modifying a drying machine and the like, and the surface of the steel strip is free of pulling-correcting white marks or corrosion defects through inspection, so that the connection requirement between production processes after the speed of a rolling mill is improved is met.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
FIG. 1 is a schematic structural view of a high-pressure spraying device;
fig. 2 is a schematic structural diagram of a brushing device.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and effects of the invention. The process of the present invention employs conventional methods or apparatus in the art, except as described below. The following noun terms have meanings commonly understood by those skilled in the art unless otherwise specified.
The terms "the," "said," "an," and "an" as used herein do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item. The terms "preferred", "more preferred", and the like, refer to embodiments of the invention that may provide certain benefits under certain circumstances. However, other embodiments may be preferred, under the same or other circumstances. Furthermore, the recitation of one or more embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the invention.
When a range of values is disclosed herein, the range is considered to be continuous and includes both the minimum and maximum values of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values of the range is included. Further, when multiple range-describing features or characteristics are provided, the ranges may be combined. In other words, unless otherwise indicated, all ranges disclosed herein are to be understood to encompass any and all subranges subsumed therein.
The cleaning unit equipment mainly comprises: the device comprises an uncoiling mechanism, a high-pressure spraying mechanism, a brushing and brushing mechanism, a cold and hot water rinsing mechanism, a drying mechanism, a coiling mechanism and the like. The process flow for cleaning the strip steel comprises the following steps: after the steel coil is uncoiled by an uncoiler, the steel coil is degreased through a high-pressure spraying section, then enters a brushing machine for scrubbing and degreasing, then enters a rinsing section for removing residual alkali liquor on the surface of the steel coil, is squeezed by a squeezing roller and then enters a drying box for drying the surface of the steel coil, and is coiled on a coiling machine.
In order to meet the requirement on the production efficiency of a cleaning unit caused by the speed increase of a rolling mill, the invention provides a method for increasing the production efficiency of a precision strip steel cleaning unit, which sequentially comprises a high-pressure spray degreasing process, a brushing degreasing process, a rinsing process, a squeezing process and a drying process. The respective steps of the present invention will be described in detail below.
Cleaning liquid
The degreasing process mainly removes residual grease on the surface of the strip steel by means of wetting, permeating, dispersing and solubilizing by utilizing saponification reaction of rolling grease and the action of a surfactant.
Wherein, the degreasing agent consists of alkaline substances, a surfactant and an additive. The alkaline substance is: KOH; the surfactant includes: OP-10, TX-10, AEO9, JFC, etc.; the additive comprises: EDTA, NTA, STP, etc.
Wherein, the degreasing aid comprises the following components: OP-10, TX-10, AEO9, JFC, EDTA, NTA, STP, etc.
Alternatively, the degreaser is purchased from Shanghai vast, Inc. under the trade designation stainless steel essential liquid degreaser A; the degreasing aid is purchased from Shanghai vast, and is sold under the trade name stainless steel essential liquid degreasing agent B by the industry Co.
In the cleaning solution of the invention, the mass ratio of the degreasing agent to the degreasing assistant is set as (2-4): 1, increasing the content of alkali to facilitate the saponification reaction of the grease and enhancing the cleaning effect.
Further preferably, the electric conductivity of the degreasing agent is 16-24 ms/cm.
Most preferably, the mass ratio of the degreasing agent to the degreasing assistant is 3:1, and the conductivity of the degreasing agent is 20 ms/cm. Therefore, the production quality requirement is met in a short cleaning time, and the production efficiency of the unit is improved.
High-pressure spray degreasing process
In the high-pressure spraying degreasing process, high-pressure water flow is used for impacting the surface of the steel strip, the degreasing agent sprayed at high speed is in chemical reaction and physical mechanical action with oil stains when contacting the surface of the steel strip, and an oil film attached to the surface of the steel strip is removed through the spraying pressure. In the high-pressure spray device shown in fig. 1, spray bars are fixed on the upper and lower sides of a steel strip, and heated cleaning liquid is sprayed onto the surface of the steel strip through nozzles.
The invention sets the spray pressure of the nozzle to be 0.7-1.1MPa, and sets the vector included angle between the cleaning liquid sprayed by the nozzle and the running direction of the steel strip to be 90-130 degrees, thereby being beneficial to the cleaning liquid to remove the oil stains on the surface of the steel strip.
Through a plurality of experiments, when the injection pressure of the nozzle is 0.8 MPa and the vector included angle between the cleaning fluid sprayed out of the nozzle and the running direction of the steel strip is 120 degrees, the degreasing effect is best, and the production efficiency of a unit can be obviously improved.
Scrubbing and degreasing process
The most main cleaning tools in the scrubbing and degreasing process are two groups of scrubbing equipment, and the scrubbing equipment is adopted to scrub two surfaces of the steel strip. The cleaning effect is enhanced by adding mechanical brushing while chemical cleaning.
In the prior art, the brush rolls are reversed (the rotation direction of the brush rolls is opposite to the running direction of the steel belt), a spray beam is arranged behind each brush roll, and cleaning liquid is sprayed along the direction tangent to the brush rolls and the steel belt from the direction consistent with the rotation of the brush rolls to flush away dirt brushed down by the brush rolls. Because a large amount of heat is generated by friction with the surface of the steel belt while the brush roller rotates at a high speed, if the brush roller continuously works in an overheated state, bristles become fragile and are broken too early, and the service life of the brush roller is greatly influenced. Thus, the sprayed cleaning liquid also functions to cool the brushes.
In the brushing device shown in fig. 2, the spraying direction of the spraying rod is adjusted, so that the cleaning liquid is sprayed to one side of the tangent point of the brush roller and the steel belt along the rotating direction of the brush roller (namely, the spraying angle of the nozzle is slightly deviated to the position of the brush roller from the tangent point of the brush roller and the steel belt), and the cleaning liquid is thrown onto the steel belt under the action of tangential and radial centrifugal forces of bristles to clean the steel belt together with the bristles.
In the prior art, in order to enable the brush roller to play a brushing role, the bristle pressing amount of the brush roller is set to be a constant value of 2-3 mm. However, as the running time increases, the pressing force of the brush roller is reduced, and the brush roller cannot play a role in brushing.
To this end, the invention sets the pressing force of the brush roller to a constant value, namely: the pressing force of the brush roller is adjusted by adjusting the input current of the pressing motor. Preferably, the brush current is set to 8-14A, most preferably 11.8A.
Squeezing process
The squeezing process adopts a squeezing roller to squeeze the moisture on the surface of the steel strip as much as possible, so as to ensure that no water is left on the surface of the steel strip in the next process (drying box) and avoid quality defects, thereby enabling the steel strip to obtain a clean and dry surface.
According to the invention, the material of the wringing roller is polyurethane rubber, and the hardness of the wringing roller is reduced to 70 +/-5 (Shore hardness) by virtue of the characteristics of good wear resistance, high strength, good elasticity, excellent oil resistance, ozone resistance, aging resistance, good air tightness and the like, so that the elasticity of the wringing roller is increased, the water blocking effect, the water absorption effect and the pressure reduction effect of the wringing roller are better, and water on the surface of the strip steel is effectively removed.
Drying procedure
After the strip steel passes through the cleaning and rinsing sections, a dryer is needed to be configured to dry the strip steel with a wet surface, so that the drying of the strip steel is ensured, and the quality problems of corrosion of the strip steel and the like caused by the moisture are prevented. The drying machine is not complicated, but the strip steel drying is a process with interaction of many parameters, high energy consumption and difficult control, so the technological parameter selection and the structural design of the drying machine directly influence the heat and mass transfer characteristics of the whole drying process, thereby influencing the drying effect of the strip steel and restricting the energy utilization efficiency.
The invention modifies the mechanical structure of the dryer under the condition that the technological parameters of the existing dryer reach the set precision of the unit. Considering the factors of cost, effect and the like, two groups of axial flow fans are arranged at the outlet of the dryer, and the top of each axial flow fan is slightly higher than the position of the steel belt. The axial flow fan is operated in the steel strip operation process, so that the evaporation of moisture on the surface of the steel strip is accelerated, and the steel strip is completely dried when reaching the coiling position.
After the precision strip steel cleaning unit is improved according to the method of the invention, the running speed of the steel strip in the cleaning process is increased to 47-55m/min (preferably 50 m/min) from 45m/min before improvement. The test shows that the surface of the steel strip has no withdrawal and straightening white mark or steel strip corrosion defect, and the connection between production processes after the speed of the rolling mill is increased is met.
Examples
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. Experimental procedures without specifying specific conditions were carried out in the following examples, according to conventional methods and conditions.
Example 1
An H-state 304 stainless steel band with the thickness of 0.15mm is selected. After the steel coil is uncoiled by an uncoiler, the steel strip runs at the speed of 50 m/min. Degreasing through a high-pressure spraying section, then brushing and degreasing in a brushing machine, then entering a rinsing section to remove residual alkali liquor on the surface of the strip steel, drying the surface of the strip steel in a drying box after being squeezed by a squeezing roller, and rolling the strip steel on a coiling machine.
Wherein, 90kg of degreasing agent and 30kg of degreasing auxiliary agent are added into the cleaning unit every day, and the conductivity of the degreasing agent is controlled to be 20 ms/cm. The high-pressure spraying pressure is controlled to be 0.8 MPa, and the vector included angle between the cleaning liquid sprayed out of the nozzle and the running direction of the steel strip is 120 degrees. The angle of the nozzle in the brush machine is finely adjusted to the deflection brush roll, the control mode of the brush roll is set to be a constant pressure mode, and the current of the brush machine is 11.8A. The rinsing section No. 9 drying roller is made of polyurethane rubber. Two sets of axial flow fans are additionally arranged at the outlet of the dryer, the top of each axial flow fan is slightly higher than the position of the steel belt, and the axial flow fans run in the running process of the steel belt.
After the cleaning is finished, the surface of the steel strip has no withdrawal and straightening white marks or steel strip corrosion defects. And (4) detecting the degreasing effect of the steel coil by using a dyne pen, wherein the dyne value is 40.
Comparative example 1
An H-state 304 stainless steel band with the thickness of 0.15mm is selected. After the steel coil is uncoiled by an uncoiler, the steel band runs at the speed of 50m/min, is degreased through a high-pressure spraying section at first, then enters a brushing machine for scrubbing and degreasing, then enters a rinsing section for removing residual alkali liquor on the surface of the steel band, is squeezed by a squeezing roller, then enters a drying box for drying the surface of the steel band, and is coiled on a coiling machine.
Wherein, 60kg of degreasing agent and 30kg of degreasing auxiliary agent are added into the cleaning unit every day, and the electric conductivity of the degreasing agent is adjusted to 12 ms/cm. The high-pressure spraying pressure is controlled to be 0.5 MPa, and the vector included angle between the cleaning liquid sprayed out of the nozzle and the running direction of the steel strip is 145 degrees. The spray beam sprays the cleaning liquid from a direction coincident with the rotation of the brush roller in a direction in which the brush roller is tangent to the steel belt. The rolling amount of the brush roller is controlled to be a constant value of 2-3 mm. The material that rinsing section # 9 wringing roller adopted is 3M.
After the cleaning is finished, the surface of the steel strip has the defects of withdrawal and straightening white marks and corrosion of the steel strip. And (4) detecting the degreasing effect of the steel coil by using a dyne pen, wherein the dyne value is 34.
The present invention has been disclosed in the foregoing in terms of preferred embodiments, but it will be understood by those skilled in the art that these embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention. It should be noted that all changes and substitutions that are equivalent to these embodiments are deemed to be within the scope of the claims of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined in the claims.
Claims (8)
1. A method for improving the production efficiency of a precision strip steel cleaning unit sequentially comprises a high-pressure spray degreasing process, a scrubbing degreasing process, a rinsing process, a squeezing process and a drying process, and is characterized in that in the high-pressure spray degreasing process, the injection pressure of a nozzle is 0.7-1.1MPa, the vector included angle between cleaning liquid sprayed out of the nozzle and the running direction of a steel strip is 90-130 degrees, and the running speed of the steel strip is 47-55 m/min;
wherein the mass ratio of the degreasing agent to the degreasing assistant in the cleaning solution is (2-4): 1, the electric conductivity of the degreasing agent is 16-24 ms/cm.
2. The method for improving the production efficiency of the precise strip steel cleaning unit according to claim 1, wherein in the brushing and degreasing process, the brushing current is 8-14A.
3. The method for improving the production efficiency of the precision strip steel cleaning unit according to claim 1, wherein in the scrubbing and degreasing process, the cleaning liquid is sprayed on one side of a tangent point of the brush roller and the steel strip along the rotation direction of the brush roller.
4. The method for improving the production efficiency of the precise strip steel cleaning unit according to claim 1, wherein in the squeezing process, the squeezing roller is made of polyurethane rubber.
5. The method for improving the production efficiency of the precision strip steel cleaning unit according to claim 4, wherein the shore hardness of the wringing roller is 70 ± 5.
6. The method for improving the production efficiency of the precision strip steel cleaning unit according to claim 1, wherein in the drying process, an axial flow fan is adopted to purge the steel strip treated by the dryer.
7. The method for improving the production efficiency of the precise strip steel cleaning unit according to claim 6, wherein the axial flow fan is arranged at the outlet of the dryer, and the top of the axial flow fan is higher than the position of the steel strip.
8. The method for improving the production efficiency of the precision strip steel cleaning unit according to claim 6, wherein the number of the axial flow fans is two.
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