Residual emulsion blowing device for reversible cold rolling mill

Abstract

The invention relates to a residual emulsified liquid blowing device for a reversible cold rolling mill, and belongs to the technical field of steel plate cold rolling, the residual emulsified liquid blowing device comprises two spraying modules, a monitoring module and a control module, the two spraying modules are arranged at an inlet and an outlet of the rolling mill respectively, and any spraying module comprises a nozzle, an emulsified liquid ejector and a blower; the nozzles are arranged towards the corresponding inlets or outlets, and the emulsion ejectors and the blowers are connected with the nozzles through valves; the control module is electrically connected with the valves and controls opening and closing of the valves, the control module is electrically connected with the air blower and controls power of the air blower, the monitoring module is arranged in the emulsion ejector and used for detecting flow of the emulsion ejector, and the monitoring module uploads flow data to the control module. The control module improves the power of the air blower after reversing when the flow data exceeds a threshold value, and reduces the power of the air blower after reversing when the flow data is lower than the threshold value.

Description

Technical Field

[0001] The invention belongs to the technical field of steel plate cold rolling, and in particular relates to a residual emulsion blowing device for a reversible cold rolling mill. Background Art

[0002] In the strip cold rolling production line, it is necessary to set up an emulsion injection device at the entrance of the rolling mill to spray the emulsion, so as to cool and lubricate the rollers. At the same time, it is necessary to seal the outlet of the rolling mill and perform purging to ensure the cleanliness of the plate surface leaving the rolling mill and prevent the emulsion from contaminating the steel coil.

[0003] In a general rolling mill, since the rolling direction needs to be switched during the operation of the reversible rolling mill, the outlet and the inlet are switched with each other. Therefore, in the above process, the position where the emulsion was previously sprayed needs to be air purged, and the position where the air was previously purged needs to be switched to emulsion spraying. After the switch, the emulsion spraying beam used for emulsion spraying stops spraying. However, at this time, emulsion remains in the emulsion spraying beam, and then the emulsion drips at the outlet, affecting the cleaning function of the outlet on the plate surface. For this reason, Chinese patent CN104998918B discloses a reversible cold rolling emulsion residue blowing conversion device, in which an upper support roller emulsion spraying beam, an upper intermediate roller emulsion spraying beam, and an upper intermediate roller emulsion spraying beam are symmetrically arranged on the inlet and outlet sides of the rolling mill. The ejection beam, the upper working roll gap emulsion injection beam, the upper anti-entanglement guide plate inner plate surface emulsion injection beam, the lower anti-entanglement guide plate inner plate surface emulsion injection beam, the lower working roll gap emulsion injection beam and the lower intermediate roll emulsion injection beam, all of the emulsion injection beams are connected with the emulsion pipeline; a one-way valve 2 is arranged in front of the pipeline nozzle of the upper anti-entanglement guide plate inner plate surface emulsion injection beam, and a one-way valve 1 is connected to the pipeline of the upper anti-entanglement guide plate inner plate surface emulsion injection beam and is connected to the air purge interface; or, a shuttle valve is arranged in front of the pipeline nozzle of the upper anti-entanglement guide plate inner plate surface emulsion injection beam, and the two inlet ends of the shuttle valve are respectively connected with the emulsion pipeline and the air purge system; it solves the problem of emulsion residue in the emulsion nozzle by arranging a start-stoppable purge system at the emulsion nozzle at the inlet and outlet. However, in the above scheme, a start-stoppable purge system is only provided at the emulsion nozzles at the inlet and outlet. When the purge power is less than the required power, the emulsion cannot be blown away from the nozzle in time. At this time, emulsion dripping at the outlet will still occur. When the purge power is too large, the energy consumption will be too high. Therefore, a residual emulsion blowing device for a reversible cold rolling mill is required, which has adjustable purge power and high adjustment accuracy. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides a residual emulsion blowing device for a reversible cold rolling mill, which has the characteristics of adjustable blowing power and high adjustment accuracy.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A residual emulsion blowing device for a reversible cold rolling mill comprises two spraying modules, a monitoring module and a control module, wherein the two spraying modules are respectively arranged at the inlet and outlet of the rolling mill, and any of the spraying modules comprises a nozzle, an emulsion injector and an air blower, wherein the nozzle is arranged toward the corresponding inlet or outlet, and the emulsion injector and the air blower are both connected to the nozzle through a valve;

[0007] The control module is electrically connected to a number of valves and controls the opening and closing of the valves. The control module is electrically connected to the blower and controls the power of the blower. The monitoring module is arranged in the emulsion injector and is used to detect the flow of the emulsion injector. The monitoring module is electrically connected to the control module and uploads the flow data to the control module. The control module increases the power of the blower after the reversal when the flow data exceeds a threshold value, and reduces the power of the blower after the reversal when the flow data is lower than a threshold value.

[0008] As a preferred technical solution of the present invention, the control module is pre-input with a flow reference value L0 and a power reference value P0, the monitoring module is arranged in the emulsion injector and is used to detect the flow L of the emulsion injector and upload the flow data L to the control module, the control module is used to calculate the power of the blower and adjust the power of the blower to P after reversing, wherein P=L / L0×P0×c, c is a pre-input constant.

[0009] As a preferred technical solution of the present invention, the monitoring module also includes a reflectivity detector, which is used to detect the reflectivity of the roller surface and upload it to the control module. The control module corrects the power of the blower upward when the reflectivity exceeds a threshold value, and the control module corrects the power of the blower downward when the reflectivity is lower than the threshold value.

[0010] As a preferred technical solution of the present invention, the control module is pre-input with a reflectivity reference value F0, the reflectivity detector is used to detect the reflectivity F of the roller surface and upload it to the control module, the control module calculates the correction coefficient A1 and adjusts the power of the air blower to P×A1;

[0011] Where A1=F / F0×d, d is a pre-entered constant.

[0012] As a preferred technical solution of the present invention, it also includes two auxiliary purges, which are electrically connected to the control module. The two auxiliary purges are respectively arranged on both sides of the blower. The control module is used to instruct the auxiliary purges to open when the flow data exceeds a threshold.

[0013] As a preferred technical solution of the present invention, it also includes a control panel, and the control panel is used to input the values ​​of L0, P0, F0 and c.

[0014] The beneficial effects of the present invention are:

[0015] (1) The emulsion flow rate before a certain reversal is monitored by setting a monitoring module, and when the emulsion flow rate exceeds a threshold, the power of the blower after the reversal is increased to reduce the influence of the residual emulsion; when the emulsion flow rate is lower than the threshold, the power of the blower after the reversal is reduced to save energy consumption;

[0016] (2) The emulsion flow rate before a certain reversal is monitored by setting a monitoring module, and when the emulsion flow rate exceeds a threshold, the power of the blower after the reversal is increased to reduce the influence of the residual emulsion; when the emulsion flow rate is lower than the threshold, the power of the blower after the reversal is reduced to save energy consumption;

[0017] (3) A reflectivity detector is set up to detect the amount of emulsion on the surface of the roller. At the same time, the control module corrects the power of the blower upward when the reflectivity exceeds the threshold, and the control module corrects the power of the blower downward when the reflectivity is lower than the threshold, thereby further improving the accuracy of the blowing power adjustment and reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 It is a schematic diagram of the structure of a single nozzle of the present invention;

[0021] Figure 3 This is a control loop block diagram of the present invention.

[0022] Description of main component symbols:

[0023] In the figure: 1. nozzle; 11. emulsion injector; 12. air blower; 2. pressure roller; 3. control module. DETAILED DESCRIPTION

[0024] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0025] See also Figure 1-3, a residual emulsion blowing device for a reversible cold rolling mill, comprising two spraying modules and a control module, the two spraying modules are respectively arranged at the inlet and outlet of the rolling mill, each spraying module comprises a nozzle, an emulsion injector and an air blower, the nozzle is arranged toward the corresponding inlet or outlet, the emulsion injector and the air blower are both connected to the nozzle through a valve;

[0026] Specifically, the rolling mill includes a plurality of rollers, a gap is left between two of the plurality of rollers, the gap forms a steel rolling station, two entrances and exits are formed on both sides of the steel rolling station, and the two entrances and exits serve as an entrance and an exit respectively;

[0027] At the same time, a nozzle is arranged above each inlet and outlet, and the outlet of the nozzle faces the roller arrangement near the inlet and outlet arrangement where the nozzle is located, and a three-way pipe is connected to the end of the nozzle away from the outlet, and the other two channels of the three-way pipe are respectively connected to the air blower and the emulsion injector through a valve. At this time, the nozzle, the air blower and the emulsion injector are connected through the three-way pipe, and there are four valves in total. The gas blown by the air blower is blown to the roller through the nozzle, and the emulsion sprayed by the emulsion injector is sprayed to the roller through the nozzle;

[0028] Specifically, the control module is electrically connected to a plurality of valves and controls the opening and closing of the plurality of valves. In this embodiment, the control module is electrically connected to four valves arranged in two inlets and outlets and controls the opening and closing of the plurality of valves. In this embodiment, the control module is used to receive information on the current operating condition of the rolling mill, and judge the distribution of the inlets and outlets in the two inlets and outlets according to the operating condition information, and define one of the inlets and outlets as the outlet, and the nozzle corresponding to the outlet is defined as the outlet nozzle, and the other inlet and outlet is defined as the inlet, and the nozzle corresponding to the inlet is defined as the inlet nozzle. The control module instructs the valve of the emulsion injector in the outlet nozzle to close and the valve of the air blower to open, and at the same time instructs the valve of the emulsion injector in the inlet nozzle to open and the valve of the air blower to close;

[0029] When in use, the steel strip enters the rolling mill from the entrance and passes through the rolling station between the two rollers. The steel strip is rolled under the pressure of the rollers. At the same time, the rotation of the rollers drives the rolled steel strip to move toward the exit and further leave the rolling mill. During this process, under the instruction of the control module, the inlet nozzle sprays emulsion toward the part of the roller close to the entrance to cool and lubricate the roller, and the outlet nozzle sprays high-pressure gas toward the part of the roller close to the exit to prevent the emulsion on the roller from splashing onto the rolled steel strip during the rotation of the roller.

[0030] At the same time, in actual production, sometimes the strip needs to enter the rolling mill from the other side to complete the rolling, and the inlet and outlet need to be reversed. At this time, the original inlet needs to be changed to an outlet, and the nozzle that originally sprayed the emulsion at the inlet is changed to spray high-pressure gas, and the original outlet is changed to an inlet, and the inlet that originally sprayed the high-pressure gas at the outlet is changed to spray emulsion. At this time, the control module instructs one of the valves at each of the two nozzles to close and the other valve to open, completing the operation when the rolling mill is reversed;

[0031] In the above process, there is a probability that after switching, the nozzle for emulsion spraying stops spraying, but at this time, emulsion remains in the nozzle, and then the emulsion drips at the outlet, affecting the cleaning function of the outlet on the board surface. After switching, the high-pressure gas sprayed from the nozzle can take out the residual emulsion in the nozzle before spraying out of the nozzle;

[0032] However, in the above scheme, only the start-stop purge system is provided at the emulsion nozzles at the inlet and outlet. When the purge power is small and less than required, the emulsion cannot be blown away from the nozzle in time. At this time, the emulsion will still drip at the outlet. When the purge power is too large, it will lead to excessive energy consumption. Therefore, a monitoring module is also included. The monitoring module is provided in the emulsion injector and is used to detect the flow rate of the emulsion injector. The monitoring module is electrically connected to the control module and uploads the flow rate data to the control module. The control module increases the power of the blower after the reversal when the flow rate data exceeds the threshold value, and reduces the power of the blower after the reversal when the flow rate data is lower than the threshold value.

[0033] Specifically, the monitoring module includes at least one flow sensor electrically connected to the control module. The control module receives data from the flow sensor and instructs the start and stop of the flow sensor. When a reversal occurs on one side, the control module defines a certain nozzle as an inlet nozzle. At this time, the control module synchronously instructs the flow sensor in the inlet nozzle to start. The flow sensor is arranged in the emulsion injector and is used to detect the flow rate of the emulsion when it is sprayed out of the nozzle, and the flow data is uploaded to the control module at a frequency of once per second. The control module calculates the average of several uploaded flow data after a certain reversal, and determines whether the average exceeds a threshold value.

[0034] When it is higher than the threshold, it means that more emulsion passes through this nozzle when it is used as an inlet nozzle. After switching to an outlet nozzle, the probability of residual emulsion is higher and the volume of residual emulsion is larger. At this time, the control module increases the power of the blower after the next reversal. A larger blower power will blow more high-pressure gas into the nozzle, which can blow out the residual emulsion in the nozzle faster and reduce the probability of residual emulsion in the nozzle dripping onto the strip. When the probability of residual emulsion is higher after reversal, the blowing power in the nozzle is increased to reduce the impact of residual emulsion.

[0035] When it is lower than the threshold, it means that less emulsion passes through this nozzle when it is used as an inlet nozzle. After switching to an outlet nozzle, the probability of residual emulsion is small, and the volume of residual emulsion is small, so there is no need for excessive blowing power. At this time, the control module reduces the power of the blower after the next reversal, and reduces the power of the blower when it is not necessary to have excessive blowing power, thereby saving energy consumption.

[0036] By setting up a monitoring module, the emulsion flow before a certain reversal is monitored, and when the emulsion flow exceeds a threshold, the power of the blower after the reversal is increased to reduce the impact of residual emulsion. When the emulsion flow is lower than the threshold, the power of the blower after the reversal is reduced to save energy.

[0037] In the above process, specifically, the control module is pre-input with a flow reference value L0 and a power reference value P0, the monitoring module is arranged in the emulsion injector and is used to detect the flow L of the emulsion injector and upload the flow data L to the control module, and the control module is used to calculate the power of the blower and adjust the power of the blower to P after the reversal, wherein P=L / L0×P0×c, and c is a pre-input constant;

[0038] When L is higher, it means that more emulsion passes through this nozzle when it is used as an inlet nozzle. After switching to an outlet nozzle, the probability of residual emulsion is higher, and the volume of residual emulsion is larger, so the power needs to be increased. At this time, the value of P=L / L0×P0×c is larger. When the control module adjusts the power of the blower to P after reversing, the power of the blower is increased to reduce the residual probability when the probability of residual emulsion is higher. Similarly, when L is lower, it means that less emulsion passes through this nozzle when it is used as an inlet nozzle. After switching to an outlet nozzle, the probability of residual emulsion is lower. At this time, the value of P=L / L0×P0×c is smaller, and the power of the blower is reduced to save power consumption when the probability of residual emulsion is lower.

[0039] In the above process, the air blower not only plays the function of blowing away the residual emulsion in the nozzle, but also has the function of blowing away the roller to prevent the emulsion on the part of the roller close to the outlet from splashing onto the plate surface. When there is more emulsion on the roller, the blowing force on the roller needs to be increased synchronously to blow away more emulsion on the surface of the roller. When there is less emulsion on the roller, there is no need for too high a blowing force to save power consumption. For this reason, the monitoring module also includes a reflectivity detector, which is used to detect the reflectivity of the roller surface and upload it to the control module. The control module corrects the power of the air blower upward when the reflectivity exceeds the threshold, and the control module corrects the power of the air blower downward when the reflectivity is lower than the threshold.

[0040] Specifically, the control module is pre-input with a reflectivity reference value F0, the reflectivity detector is used to detect the reflectivity F of the roller surface and upload it to the control module, the control module calculates the correction coefficient A1 and adjusts the power of the blower to P×A1; wherein A1=F / F0×d, d is a pre-input constant;

[0041] When the reflectivity F is large, it means that there is more emulsion on the surface of the roller, resulting in a large reflectivity. At this time, the blowing force needs to be further increased. At this time, the value of A1=F / F0×d is large, and the value of P×A1 is small. When the control module adjusts the power of the blower to P×A1, the blowing force is increased when the reflectivity is large and the surface emulsion is large, and the blowing force needs to be further increased;

[0042] Similarly, when the reflectivity F is small, it means that there is less emulsion on the surface of the roller, resulting in a smaller reflectivity. At this time, there is no need to further increase the blowing force. At this time, the value of A1=F / F0×d is small. When the control module adjusts the power of the blower to P×A1, the blowing force is reduced when the reflectivity is small and the surface emulsion is less, and there is no need to further increase the blowing force, thereby saving power consumption.

[0043] In the case where there is a lot of residual emulsion, there is a marginal effect if a single blower continues to increase its power, and the improvement of the blowing effect is limited, and it is impossible to completely blow away the residual emulsion. At this time, an additional auxiliary blower needs to be introduced for blowing. For this purpose, two auxiliary blowers are also included. The auxiliary blowers are electrically connected to the control module. The two auxiliary blowers are respectively arranged on both sides of the blower. Specifically, with the direction perpendicular to the movement of the strip as the reference direction, the two auxiliary blowers are respectively arranged on both sides of the blower along the reference direction and are arranged toward the rollers;

[0044] When in use, the control module is used to instruct the auxiliary purge to be turned on when the flow data exceeds a threshold value.

[0045] Also included is a control panel for inputting values ​​of L0, P0, F0 and c.

[0046] The working principle and use process of the present invention:

[0047] When in use, the steel strip enters the rolling mill from the entrance and passes through the rolling station between the two rollers. The steel strip is rolled under the pressure of the rollers. At the same time, the rotation of the rollers drives the rolled steel strip to move toward the exit and further leave the rolling mill. During this process, under the instruction of the control module, the inlet nozzle sprays emulsion toward the part of the roller close to the entrance to cool and lubricate the roller, and the outlet nozzle sprays high-pressure gas toward the part of the roller close to the exit to prevent the emulsion on the roller from splashing onto the rolled steel strip during the rotation of the roller.

[0048] The control module is used to receive information about the current operating conditions of the rolling mill, and determine the distribution of the two inlets and outlets based on the operating condition information, and define one of the inlets and outlets as the outlet, and the nozzle corresponding to the outlet is defined as the outlet nozzle, and the other inlet and outlet is defined as the inlet, and the nozzle corresponding to the inlet is defined as the inlet nozzle. The control module instructs the valve of the emulsion injector in the outlet nozzle to close and the valve of the air blower to open, and at the same time instructs the valve of the emulsion injector in the inlet nozzle to open and the valve of the air blower to close.

[0049] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A residual emulsion blowing device for a reversible cold rolling mill, characterized in that: It includes two spraying modules, a monitoring module and a control module. The two spraying modules are respectively arranged at the inlet and outlet of the rolling mill. Any of the spraying modules includes a nozzle, an emulsion injector and an air blower. The nozzle is arranged toward the corresponding inlet or outlet. The emulsion injector and the air blower are connected to the nozzle through a valve. The control module is electrically connected to a number of valves and controls the opening and closing of the valves. The control module is electrically connected to the blower and controls the power of the blower. The monitoring module is arranged in the emulsion injector and is used to detect the flow of the emulsion injector. The monitoring module is electrically connected to the control module and uploads the flow data to the control module. The control module increases the power of the blower after the reversal when the flow data exceeds a threshold value, and reduces the power of the blower after the reversal when the flow data is lower than a threshold value.

2. The residual emulsion blowing device for a reversible cold rolling mill according to claim 1, characterized in that: The control module is pre-input with a flow reference value L0 and a power reference value P0. The monitoring module is arranged in the emulsion injector and is used to detect the flow L of the emulsion injector and upload the flow data L to the control module. The control module is used to calculate the power of the blower and adjust the power of the blower to P after reversing, wherein P=L / L0×P0×c, and c is a pre-input constant.

3. The residual emulsion blowing device for a reversible cold rolling mill according to claim 2, characterized in that: The monitoring module also includes a reflectivity detector, which is used to detect the reflectivity of the roller surface and upload it to the control module. The control module corrects the power of the blower upward when the reflectivity exceeds a threshold value, and corrects the power of the blower downward when the reflectivity is lower than a threshold value.

4. The residual emulsion blowing device for a reversible cold rolling mill according to claim 3 is characterized in that: The control module is pre-input with a reflectivity reference value F0, the reflectivity detector is used to detect the reflectivity F of the roller surface and upload it to the control module, the control module calculates the correction coefficient A1 and adjusts the power of the air blower to P×A1; Where A1=F / F0×d, d is a pre-entered constant.

5. The residual emulsion blowing device for a reversible cold rolling mill according to claim 2, characterized in that: It also includes two auxiliary purges, which are electrically connected to the control module. The two auxiliary purges are respectively arranged on both sides of the air blower. The control module is used to instruct the auxiliary purges to be turned on when the flow data exceeds a threshold.

6. The residual emulsion blowing device for a reversible cold rolling mill according to claim 4, characterized in that: Also included is a control panel for inputting values ​​of L0, P0, F0 and c.

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