Injection device

Abstract

The invention provides a spraying device. The spraying device is arranged on the inlet side of a rolling mill rack. The rolling mill is a cold rolling temper mill; a certain included angle is formed between the spraying direction of the spraying device and the strip steel rolling horizontal line; and spraying gas and / or liquid with certain pressure to the surfaces of the middle roller and the supporting roller through a spraying nozzle of the spraying device, so that the air pressure of each section area of the surfaces of the middle roller and the supporting roller is balanced. Under the action of injection pressure, the leveling liquid blows away and flushes away stains on the surface of the supporting roller, dirt is prevented from being gathered, the problem that irregular multi-strip-shaped stains often appear in the middle of the surface of the strip steel leveled by the leveling machine in the width direction is effectively solved, and the problem that the surface quality of the leveled strip steel is degraded due to the defect is solved.

Description

[0001] The application is a divisional application of the parent application entitled "Method for inhibiting Bernoulli negative pressure effect in high-speed rotating area of cold rolling and skin pass mill roll", application number 2022107260786, filing date June 23, 2022. TECHNICAL FIELD

[0002] The application relates to the field of strip rolling production, in particular to a spraying device. BACKGROUND

[0003] In the production of a cold rolling and skin pass mill, irregular multiple stains often appear in the middle of the strip width direction, which ultimately leads to degradation of the surface quality of the skin-passed strip.

[0004] In summary, the prior art has the following problems: the surface quality of the skin-passed strip is poor. SUMMARY

[0005] The purpose of the application is to solve the problem of poor surface quality of the skin-passed strip.

[0006] To this end, the application provides a method for inhibiting Bernoulli negative pressure effect in high-speed rotating area of cold rolling and skin pass mill roll, comprising the following steps:

[0007] A spraying device is provided at the entry side of the mill stand;

[0008] The spraying direction of the spraying device has a certain angle with the horizontal line of strip rolling;

[0009] The spraying nozzles of the spraying device spray gas and / or liquid with a certain pressure to the surface of the intermediate roll and the backup roll, so that the air pressure of each section of the surface of the intermediate roll and the backup roll is balanced, so as to inhibit the negative pressure area or make the negative pressure area become a positive pressure area, which is beneficial to the discharge of dirt and prevents the accumulation of dirt.

[0010] Specifically, the spraying device is provided with a plurality of equally distributed spraying nozzles, and the angle between the spraying nozzles of the spraying device and the direction of the rolled strip is 30°-35°.

[0011] Specifically, a liquid-gas mixed blowing device for the intermediate roll and the backup roll is additionally provided at the entry side of the mill, which mixes compressed air and skin pass liquid into a liquid-gas mixture and sprays it to the surface of the intermediate roll and the backup roll.

[0012] Specifically, the spraying coverage areas of adjacent spraying nozzles have overlapping parts, and the spraying fan angle of the spraying nozzles is controlled to be 50°.

[0013] Specifically, the spraying device includes a movable cross beam, the spraying nozzles are arranged on the movable cross beam, and the movable cross beam moves along the length direction of the roll to spray the roll surface.

[0014] Specifically, the spraying device comprises a fixed beam, a plurality of spraying nozzles are arranged on the fixed beam, and the roll surface is sprayed.

[0015] Specifically, the interval of the spraying nozzles is controlled to be 79 mm.

[0016] Specifically, the horizontal distance between the plumb line of the spraying nozzle and the plumb line of the roll surface on the inlet side of the support roll is controlled to be 251±15 mm.

[0017] Specifically, the spraying device is arranged at the inlet side of the rolling mill, and a liquid-gas mixture of compressed air and the smoothing liquid with a certain pressure is sprayed to the surface of the intermediate roll and the support roll to inhibit the generation of a negative pressure area on the surface of the intermediate roll and the support roll or change the negative pressure area into a positive pressure area.

[0018] Specifically, the spraying device is arranged at the inlet side of the rolling mill, and a liquid-gas mixture of compressed air and the smoothing liquid with a certain pressure is sprayed to the surface of the intermediate roll and the support roll to inhibit the generation of a negative pressure area on the surface of the intermediate roll and the support roll or change the negative pressure area into a positive pressure area.

[0019] The inventor has investigated and analyzed on the spot that the four-high and six-high smoothing mills in the cold rolling plant of Liuzhou Iron and Steel Co., Ltd. are designed to spray the smoothing liquid only in the roll gap of the work roll, and the main function is to spray the smoothing liquid to lubricate the roll and clean the surface of the strip. The raw material of the smoothed strip is a steel coil after cover annealing, and the steel coil does not have a degreasing or other surface cleaning process before entering the annealing or smoothing. The surface of the annealed strip has carbon deposits to some extent (very small amount in the continuous annealing and galvanizing unit), and the carbon deposits cannot be effectively washed away by the smoothing liquid sprayed only in the roll gap of the work roll. The residual part of the carbon deposits after the smoothing liquid spraying will be reproduced on the surface of the work roll, and then reproduced on the surfaces of the upper intermediate roll and the upper support roll (this does not exist in the lower intermediate roll and the lower support roll because the smoothing liquid sprayed in the mill stand flows downward through the surfaces of the lower rolls and then enters the pit, and the liquid amount passing through the surfaces of the lower rolls is sufficient). According to the Bernoulli principle, a local negative pressure area will be formed in the middle part of the roll length direction relative to the two ends during the high-speed rotation of the roll, and then the dirt accumulated on the surface of the roll will be gathered to the negative pressure area. The dirt on the surface of the negative pressure area of the work roll will be reproduced to the intermediate roll and the support roll, and the dirt on the surface of the negative pressure area of the intermediate roll and the support roll will be accumulated to a certain extent and cannot be cleaned, which will in turn be reproduced to the surface of the work roll. The amount of dirt will continuously increase and continue to occur, and the smoothing liquid spraying capacity of the work roll is insufficient to clean the accumulated residual dirt from the surface of the work roll. The dirt will be reproduced to the surface of the strip, and multiple irregular dirt marks will appear in the middle part of the width direction of the strip, which will finally lead to the degradation of the surface quality of the smoothed strip.

[0020] The present application sprays liquid to the surface of the intermediate roller and the support roller to inhibit the negative pressure area formed in the middle area of the length direction of the roller due to the Bernoulli principle during high speed rotation. According to the space at the entrance side of the rolling mill stand, a special spraying cleaning device for the surface dirt of the support roller is made, the spraying liquid is taken from the smoothing liquid main pipeline, the support roller spraying beam has a certain spraying angle with the rolling horizontal line, the spraying nozzle has a number and distribution distance requirement, so that the smoothing liquid sprayed by the nozzle can be sprayed to the surface area of the upper support roller at a certain angle, the generation of the negative pressure area is inhibited under the action of the spraying pressure, and the dirt on the surface of the support roller is blown away and washed away by the smoothing liquid, the dirt is prevented from gathering, the spraying liquid opening button is implanted into the first level computer picture for the operator to operate, and automatic spraying and manual spraying switching can be realized according to the speed change of the unit.

[0021] The beneficial effects are that the present intermediate roller and support roller dirt cleaning method and spraying device can effectively inhibit the negative pressure area formed in the rolling mill stand during high speed rotation, avoid the gathering of dirt, and eliminate the surface quality defects of the strip steel. According to the liquid spraying method and the actual situation, the spraying beam is designed, the smoothing liquid sprayed can be effectively sprayed to the surface area of the upper support roller at a predetermined angle and spraying pressure, the dirt on the surface of the support roller is blown away and washed away by the smoothing liquid under the action of the spraying pressure, the gathering of dirt is prevented, the irregular multiple streaks often appearing in the middle part of the width direction of the strip steel after the smoothing of the smoothing mill are effectively solved, and the problem of surface quality degradation of the strip steel after smoothing caused by the defects is eliminated. The intermediate roller and support roller dirt cleaning method and spraying device are simple to apply and easy to realize, have strong reproducibility, and create considerable economic benefits. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a spraying beam structure schematic diagram provided by the embodiment of the present application;

[0023] Figure 2 is a working layout schematic diagram of the spraying device provided by the embodiment of the present application;

[0024] Figure 3 is a structure schematic diagram of the first embodiment of the spraying beam provided by the embodiment of the present application.

[0025] Legend of the figures:

[0026] 1, first ball valve; 2, electromagnetic valve; 3, second ball valve; 4, stainless steel pipe; 5, high-pressure rubber pipe; 6, spraying beam; 7, spraying nozzle; 11, upper support roller; 12, upper work roller; 13, lower work roller; 14, lower support roller. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0028] Four-roller (six-roller) skin pass mill rolls in the process of high-speed rotation, due to the negative pressure zone formed in the middle region of the roll length direction according to Bernoulli's principle. It is necessary to inhibit the Bernoulli negative pressure effect.

[0029] In the embodiments of the present application, as Figure 1 , a method for inhibiting Bernoulli negative pressure effect in the high-speed rotation region of a cold rolling skin pass mill roll is provided, comprising the following steps:

[0030] A spraying device is arranged at the entry side of the rolling mill stand;

[0031] The spraying direction of the spraying device has a certain angle with the rolling level of the strip steel;

[0032] The spraying nozzles of the spraying device spray gas and / or liquid with a certain pressure to the surfaces of the intermediate roll and the support roll, so that the air pressure of each section of the surfaces of the intermediate roll and the support roll is balanced. The effect of avoiding the accumulation of dirt is achieved, so as to eliminate the dirt defects on the surface of the strip steel.

[0033] The spraying nozzles of the spraying device spray gas and / or liquid with a certain pressure to the surfaces of the intermediate roll and the support roll, so that the air pressure of each section of the surfaces of the intermediate roll and the support roll is balanced. The effect of avoiding the accumulation of dirt is achieved, so as to eliminate the dirt defects on the surface of the strip steel.

[0034] The spraying device comprises a spraying beam 6, a plurality of spraying nozzles 7 are arranged on the spraying beam 6, and an inlet end is opened in the middle of the spraying beam 6 and is connected with a high-pressure rubber pipe 5. The high-pressure rubber pipe 5 is connected with a stainless steel pipe 4, the stainless steel pipe 4 is in L shape, and a first ball valve 1, an electromagnetic valve 2 and a second ball valve 3 are sequentially arranged on the stainless steel pipe 4 along the spraying direction.

[0035] A support roller spray beam end head fixing frame is made on both sides of the frame inside the booth to install and fix the made spray beam. The length of the spray beam is c, c is 1788mm of the support roller spray beam, material: SS304, diameter: φ38mm, an end of the flat liquid inlet is opened in the middle of the beam, the joint diameter: M24*1.5, the thread length: 25mm, the joint total length: 50mm, ready to be connected with the standard high pressure rubber pipe (model: 13ⅠH-1500). On the opposite side of the flat liquid inlet end of the beam, the flat liquid nozzle outlet ends are evenly opened with a distance of 79mm, the end diameter: DN10, ready to be connected with the standard nozzle (spray nozzle) of a certain factory model H1 / 8VV-SS304-5002, basic technical parameters: thread G1 / 8, equivalent nozzle diameter 0.91mm, flow rate 0-1.0L / min, spray angle δ 50°.

[0036] A flat liquid outlet hard pipe is led out from the flat liquid main pipe, and the hard pipe is sequentially connected with: a ball valve, an electromagnetic valve, a ball valve, a rubber pipe, and the flat liquid inlet end of the support roller spray beam. The ball valve model: Q11F-16P, the electromagnetic valve model: ZCZP-25S.

[0037] A soft pipe is connected to the flat liquid inlet end of the support roller spray beam, so that the subsequent adjustment of the spray beam angle is not limited. One end of the soft pipe is connected to the flat liquid inlet end of the support roller spray beam, and the other end is connected to the hard pipe led out from the flat liquid main pipe. The maximum pressure of the flat liquid main pipe is 4.0bar.

[0038] The spray device is provided with a plurality of spray nozzles distributed at equal distances. The distance between the spray nozzles is controlled to be d, d is 79mm. As shown in Figure 3 , the spray length of the spray device is b, b can be 1550mm, 1450mm, or 1250mm.

[0039] The angle β between the spray nozzles of the spray device and the direction of the rolled strip is controlled to be 30°-35°, and the preferred angle β is 30°.

[0040] The spray coverage areas of adjacent spray nozzles have overlapping parts, and the spray fan angle δ of the spray nozzles is controlled to be 50°.

[0041] The spray device includes a movable cross beam, the spray nozzles are arranged on the movable cross beam, the movable cross beam moves along the length direction of the roll, and the roll surface is sprayed.

[0042] The spray device includes a fixed cross beam, a plurality of spray nozzles are arranged on the fixed cross beam, and the roll surface is sprayed.

[0043] The horizontal distance between the plumb line of the spray nozzle and the plumb line of the roll surface on the inlet side of the support roller is controlled to be a, a is 251±15mm.

[0044] The spray device is arranged at the inlet side of the rolling mill, and a certain pressure flat liquid is sprayed to the surface of the intermediate roller and the support roller to inhibit the negative pressure area on the surface of the intermediate roller and the support roller or change the negative pressure area to a positive pressure area, so as to avoid the gathering of dirt and eliminate the dirt defects on the surface of the strip.

[0045] The spray device is arranged at the inlet side of the rolling mill, and a certain pressure flat liquid is sprayed to the surface of the intermediate roller and the support roller to inhibit the negative pressure area on the surface of the intermediate roller and the support roller or change the negative pressure area to a positive pressure area, so as to avoid the gathering of dirt and eliminate the dirt defects on the surface of the strip.

[0046] The technical scheme of the present application is:

[0047] The application method is: writing the automatic / manual spray program of the support roller and implanting the rolling program system. The switching button of the automatic / manual mode of the support roller spray mode is developed on the main picture of the primary flat liquid system of the rolling. The support roller spray starting button is newly added on the operation platform.

[0048] When the automatic function is realized: after the system picture selects the support roller spray mode as the automatic mode, when the rolling speed is greater than 0.8 m / s (which can be adjusted according to the needs of the main operation platform), the electromagnetic valve on the support roller spray branch of the flat liquid system is opened and kept for 40 seconds (which can be adjusted according to the needs of the main operation platform) and then closed. Considering the control of the flat liquid residue, the automatic spray function is not automatically put into use when the rolling speed enters the tailing section and the automatic spray function is realized. When the manual function is realized: according to the production state needs, when the manual spray is used, after the system picture selects the support roller spray mode as the manual mode, the newly added support roller spray starting button key on the operation platform is pressed, the flat liquid is sprayed, and then the key is pressed again to stop.

[0049] At present, the dirt removing method and the spray device of the intermediate roller and the support roller of the temper mill can effectively inhibit the negative pressure area formed when the roller rotates at high speed in the rack, avoid the gathering of dirt, eliminate the dirt defects on the surface of the strip, and effectively solve the problem of the irregular multiple dirt marks on the middle part of the surface of the strip in the width direction after the strip is tempered. The spray beam designed according to the liquid spraying method and the field situation can effectively spray the flat liquid to the surface area of the upper support roller at the predetermined angle and spray pressure, blow and wash away the dirt marks on the surface of the support roller under the action of the spray pressure, prevent the gathering of dirt, and eliminate the problem of the degradation of the surface quality of the strip after tempering caused by the defects. The dirt removing method and the spray device of the intermediate roller and the support roller of the temper mill are simple to apply and easy to realize, have strong replicability, and create considerable economic benefits.

[0050] Embodiment 1:

[0051] In the present application, as Figure 2 , the four-roll (six-roll) leveler roller is inhibited from forming a negative pressure zone in the middle region in the length direction of the roller during high-speed rotation due to the "Bernoulli principle", and for this purpose the present application takes the following technical measures:

[0052] The angle between the jet nozzle of the jetting device and the direction of the rolled strip is β, and β is controlled to be 30°-35°, and the preferred angle β is 30°. The jetting coverage areas of adjacent jet nozzles have overlapping portions, and the jetting fan angle δ of the jet nozzle is controlled to be 50°.

[0053] 1. An intermediate roll and backup roll liquid spraying device (jetting device) is added at the entry side of the rolling mill, and the liquid is generally leveling liquid. In the production process, liquid with a certain pressure is sprayed to the surface of the intermediate roll and backup roll to increase the lubrication and cleaning ability of the roll surface, and at the same time, the air pressure of each section of the surface of the intermediate roll and backup roll is relatively balanced, so as to inhibit the formation of a negative pressure zone or change the negative pressure zone to a positive pressure zone, which is beneficial to the discharge of dirt and prevents the accumulation of dirt, thereby achieving the purpose of eliminating the reproduction of stains.

[0054] 2. An intermediate roll and backup roll liquid-gas mixed blowing device (jetting device) is added at the entry side of the rolling mill, and the gas is generally compressed air and the liquid is generally leveling liquid. In the production process, a liquid-gas mixture with a certain pressure is sprayed to the surface of the intermediate roll and backup roll to further lubricate and clean the roll surface, and at the same time, the air pressure of each section of the surface of the intermediate roll and backup roll is relatively balanced, so as to inhibit the formation of a negative pressure zone or change the negative pressure zone to a positive pressure zone, which is beneficial to the discharge of dirt and prevents the accumulation of dirt, thereby achieving the effect of eliminating the reproduction of stains.

[0055] 3. An intermediate roll and backup roll blowing device (jetting device) is added at the entry side of the rolling mill, and the gas is generally compressed air. In the production process, gas with a certain pressure is sprayed to the surface of the intermediate roll and backup roll, and the air pressure of each section of the surface of the intermediate roll and backup roll is relatively balanced, so as to inhibit the formation of a negative pressure zone or change the negative pressure zone to a positive pressure zone, which is beneficial to the discharge of dirt and prevents the accumulation of dirt, thereby achieving the effect of eliminating the reproduction of stains.

[0056] 4. The liquid spraying, gas blowing or liquid-gas mixed spraying device described above can be a certain number of nozzles fixed on a beam in a fixed manner at a certain angle and distance, and the nozzles spray (blow) the roll surface according to the spraying (blowing) frequency; or a certain number of nozzles can be carried on a beam in a movable manner at a certain angle and distance, and the nozzles spray (blow) the roll surface by moving in the length direction of the roll according to the spraying (blowing) frequency.

[0057] Embodiment 2:

[0058] The technical scheme provided by the present application is: through the mode of spraying liquid on the surface of the intermediate roll and the support roll, a negative pressure area formed in the middle area of the length direction of the roll due to Bernoulli principle during high-speed rotation of the roll is inhibited.

[0059] According to the space on the inlet side of the rolling mill stand, a special spraying cleaning device (spraying device) for dirt on the surface of the support roll is made, the spraying liquid is taken from the smoothing liquid main pipeline, the support roll spraying beam has a certain spraying angle with the rolling horizontal line, the nozzle has a number and a distribution distance requirement, so that the smoothing liquid sprayed by the nozzle can be sprayed to the surface area of the upper support roll at a certain angle, the generation of the negative pressure area is inhibited under the action of the spraying pressure, and the dirt on the surface of the support roll is blown away and washed away by the smoothing liquid, preventing the accumulation of dirt, the opening button of the spraying liquid is implanted into the first-level computer picture for operation by the operator, and automatic spraying and manual spraying switching can be realized according to the speed change of the unit.

[0060] At present, the dirt removing method and the spraying device for the intermediate roll and the support roll of the temper mill can effectively inhibit the formation of the negative pressure area in the rolling mill stand during high-speed rotation of the roll, avoid the accumulation of dirt, and eliminate the surface quality defects of the strip steel. According to the spraying method and the on-site situation, the spraying beam is designed, the smoothing liquid sprayed by the spraying beam can be effectively sprayed to the surface area of the upper support roll at a predetermined angle and spraying pressure, the dirt on the surface of the support roll is blown away and washed away by the smoothing liquid under the action of the spraying pressure, preventing the accumulation of dirt, effectively solving the problem of irregular multiple dirt lines often appearing in the middle part of the surface width of the strip steel after the temper mill is smoothed, and eliminating the problem of surface quality degradation of the strip steel after the temper mill is smoothed caused by the defect. The dirt removing method and the spraying device for the intermediate roll and the support roll of the temper mill are simple to apply and easy to implement, have strong replicability, and create considerable economic benefits.

[0061] The above description is only a specific embodiment of the present application, and is not intended to limit the scope of the present application. The components of the present application can be combined with each other under the condition of no conflict, and any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present application shall fall within the scope of the present application.

Claims

1. A spraying device, characterized in that, A spraying device is installed on the inlet side of the rolling mill stand; the rolling mill is a cold rolling leveling machine. The spraying direction of the spraying device should have a certain angle with the horizontal line of the strip rolling process; The spraying device sprays gas and / or liquid with a certain pressure onto the surface of the upper intermediate roll and upper support roll through the spray nozzles, so as to equalize the air pressure in each section of the surface of the intermediate roll and support roll, so as to suppress the negative pressure area or turn the negative pressure area into a positive pressure area, which is conducive to the discharge of dirt and prevents the accumulation of dirt; the spraying device is equipped with multiple spray nozzles that are evenly distributed, so that the angle between the spray nozzles of the spraying device and the direction of the rolled strip is 30° to 35°. The spray coverage areas of adjacent nozzles overlap, and the spray fan angle of the nozzles is controlled at 50°. The horizontal distance between the vertical line of the nozzle and the vertical line of the inlet side roller surface of the support roller is controlled at 251±15mm.

2. The spraying device as claimed in claim 1, characterized in that, The spraying device includes a movable crossbeam on which the spray nozzle is mounted. The movable crossbeam moves along the length of the roll to spray the roll surface.

3. The spraying device as described in claim 1, characterized in that, The spraying device includes a fixed crossbeam on which multiple spray nozzles are mounted to spray the roller surface.

4. The spraying device as claimed in claim 1, characterized in that, The spacing of the spray nozzles is controlled to be 79 mm.

5. The spraying device as claimed in claim 1, characterized in that, The spraying device includes a spray beam with multiple spray nozzles distributed on it. An inlet end is opened in the middle of the spray beam to connect with a high-pressure hose. The high-pressure hose is connected to a stainless steel pipe, which is L-shaped. A first ball valve, a solenoid valve, and a second ball valve are sequentially arranged on the stainless steel pipe along the spraying direction.

6. The spraying device as claimed in claim 1, characterized in that, The angle between the nozzle of the spraying device and the direction of the rolled strip is 30°.

7. The spraying device as claimed in claim 5, characterized in that, Inside the frame, on both sides of the archway, support roller spray beam end fixing brackets are made to install and fix the prepared spray beam. A leveling liquid inlet is opened in the middle of the spray beam, and leveling liquid nozzle outlets are evenly distributed on the opposite side of the leveling liquid inlet of the beam.

8. The spraying device as claimed in claim 7, characterized in that, A rigid pipe leading out of the leveling liquid main pipe is connected to the following components in sequence: first ball valve, solenoid valve, second ball valve, rubber hose, and the leveling liquid inlet end of the support roller spray beam.

9. The spraying device as claimed in claim 7, characterized in that, A flexible hose is connected to the leveling liquid inlet of the support roller spray beam. One end of the hose is connected to the leveling liquid inlet of the support roller spray beam, and the other end is connected to a rigid pipe leading out from the main leveling liquid pipe.

10. The spraying device as claimed in claim 1, characterized in that, The spray length of the spraying device is b, which is 1550mm, 1450mm or 1250mm.

Images