A single-stand 20-roll reversible cold rolling mill emulsion spraying and control system

Abstract

This invention provides an emulsion spraying and control system for a single-stand 20-roll reversible cold rolling mill. The first spraying zone is used for lubrication and cooling of the work roll gap; the second spraying zone is used for cooling the rolls between the intermediate roll and the work roll; the third spraying zone is used for strip cooling; the fourth spraying zone is used for strip cooling; the spray head in the third spraying zone is located between the work roll and the spray head in the fourth spraying zone; and the fifth spraying zone is used for cooling the back support roll. The left upper and lower spray beams of the first spraying zone share a first control path, and the right upper and lower spray beams share a second control path. The upper left and right spray beams of the second spraying zone share a third control path, and the lower left and right spray beams share a fourth control path. The left upper and lower spray beams of the third spraying zone share a fifth control path, and the right upper and lower spray beams share a sixth control path. The left upper and lower spray beams of the fourth spraying zone share a seventh control path, and the right upper and lower spray beams share an eighth control path. The four spray beams of the fifth spraying zone share a ninth control path.

Description

Technical Field

[0001] This invention relates to the field of rolling mill cooling and lubrication, and more particularly to an emulsion injection and control system for a single-stand 20-roll reversible cold rolling mill. Background Technology

[0002] Single-stand 20-roll reversible cold rolling mills require emulsion injection and control systems for roll gap lubrication and roll cooling. For most steel grades, during cold rolling, it is sufficient to maintain the strip exit temperature at or below the normal exit strip temperature (usually below 120°C), with no strict temperature requirements. However, a type of high-magnetic silicon steel has special requirements for the strip exit temperature, requiring a certain pass to reach above 200°C. This means that during the rolling of this silicon steel, the temperature needs to be continuously increased in the preceding passes, stopping once it reaches above 200°C in a certain pass. Subsequent passes then use high-flow-rate emulsion injection to rapidly reduce the strip temperature to the exit strip temperature. Subsequent passes, similar to other steel grades, only need to maintain or lower the normal exit strip temperature. Currently, there is an urgent need to design an emulsion injection and control system suitable for high-magnetic silicon steel. Summary of the Invention

[0003] The purpose of this invention is to overcome the defects of the prior art and provide an emulsion injection and control system for a single-stand 20-roll reversible cold rolling mill. This invention solves at least some of the problems in the prior art.

[0004] This invention is implemented as follows:

[0005] This invention provides an emulsion spraying and control system for a single-stand 20-roll reversible cold rolling mill, comprising a first spraying zone, a second spraying zone, a third spraying zone, a fourth spraying zone, and a fifth spraying zone. The first spraying zone is used for lubrication and cooling of the work roll gap; the second spraying zone is used for cooling the rolls between the intermediate roll and the work roll; the third spraying zone is used for strip cooling; the fourth spraying zone is used for strip cooling; the spray head of the third spraying zone is located between the work roll and the spray head of the fourth spraying zone; and the fifth spraying zone is used for cooling the back support roll. The first spraying zone includes four spray beams (upper, lower, left, and right), wherein the upper and lower spray beams on the left share a first control path, and the upper and lower spray beams on the right share a second control path. The first spraying zone is independently controlled by the left and right paths. The second spray zone includes four spray beams: top, bottom, left, and right. The top left and right spray beams share a third control path, and the bottom left and right spray beams share a fourth control path. The second spray zone is controlled independently by the top and bottom paths. The third spray zone includes four spray beams: top, bottom, left, and right. The left top and bottom spray beams share a fifth control path, and the right top and bottom spray beams share a sixth control path. The third spray zone is controlled independently by the left and right paths. The fourth spray zone includes four spray beams: top, bottom, left, and right. The left top and bottom spray beams share a seventh control path, and the right top and bottom spray beams share an eighth control path. The fourth spray zone is controlled independently by the left and right paths. The fifth spray zone includes four spray beams: top, bottom, left, and right. The four spray beams in the fifth spray zone share a ninth control path.

[0006] Furthermore, the first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth supply lines are independent of each other, and each of the supply lines is equipped with a pressure sensor (PT) to detect the emulsion pressure on the line.

[0007] Furthermore, regulating valves (YGPs) are installed on the supply pipelines of the first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth lines. The regulating valves (YGPs) are used to control the switching and flow regulation.

[0008] Furthermore, the supply pipelines of the first, second, third, fourth, fifth, sixth, seventh, and eighth lines are equipped with drain valves (YV), which are used to drain liquid from the supply pipeline bypass to the waste liquid tank.

[0009] Furthermore, flow meters (BQ) are installed on the supply lines of the first, second, fifth, and sixth lines, and the flow meters (BQ) are used for closed-loop flow control.

[0010] Furthermore, the required amount of emulsion for each pipeline is calculated based on the rolling process and the heating strategy for each pass. Then, the opening of the regulating valve (YGP) is controlled according to the set value of each loop to achieve flow control.

[0011] Furthermore, the second, fourth, and fifth injection zones indirectly control the flow rate in the loop through pressure control, while the first and third injection zones directly control the flow rate in the pipeline through a closed-loop flow meter (BQ). The first and third injection zones undertake the main task of temperature control.

[0012] Furthermore, if temperature deviations occur during rolling, the set values ​​of the corresponding circuits are manually adjusted to achieve fine-tuning of the temperature.

[0013] Furthermore, controlling the flow rate of the first and third spray zones can enable the strip to be heated and rolled in the first few passes, with the highest strip temperature reaching over 200°C. In subsequent passes, the strip temperature is quickly reduced to the normal exit temperature by a large flow rate of emulsion, and then the temperature is maintained or lower than the normal temperature in subsequent passes.

[0014] Furthermore, the fourth injection zone employs high-flow-rate cooling.

[0015] This invention provides an emulsion injection and control system for a single-stand 20-roll reversible cold rolling mill, which can meet the special requirements of high magnetic silicon steel for the strip temperature at the rolling exit. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 An emulsion injection and control system (drive side) provided for embodiments of the present invention;

[0018] Figure 2 Provided for embodiments of the present invention Figure 1 Enlarged view of the upper middle section;

[0019] Figure 3 Provided for embodiments of the present invention Figure 1 Enlarged image in the bottom left corner;

[0020] Figure 4 Provided for embodiments of the present invention Figure 1 Enlarged image in the bottom right corner;

[0021] Figure 5 Provided for embodiments of the present invention Figure 1 Enlarged view of the lower middle section;

[0022] Figure 6 An emulsion spraying and control system (operation side) provided for embodiments of the present invention. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0025] like Figures 1-6 This invention provides an emulsion injection and control system for a single-stand 20-roll reversible cold rolling mill, such as... Figure 1 (drive side) and Figure 6 (Operating side) includes 5 spray zones and 9 independently controlled spray circuits. The first spray zone ① is for lubrication and cooling of the work roll gap, including 4 spray beams (upper, lower, left, and right). The upper and lower spray beams on the left share one control circuit, and the upper and lower spray beams on the right share one control circuit. This zone is independently controlled by two circuits (left and right). The second spray zone ② is for cooling the roll between an intermediate roll and the work roll, including 4 spray beams (upper, lower, left, and right). The upper and lower spray beams on the left and right share one control circuit, and the upper and lower spray beams on the right share one control circuit. This zone is independently controlled by two circuits (upper and lower). The third spray zone ③ is for strip cooling, including 4 spray beams (upper, lower, left, and right). The upper and lower spray beams on the left share one control circuit, and the upper and lower spray beams on the right share one control circuit. This zone is independently controlled by two circuits (left and right). The fourth spray zone ④ is also for strip cooling, including 4 spray beams (upper, lower, left, and right). The upper and lower spray beams on the left share one control circuit, and the upper and lower spray beams on the right share one control circuit. This zone is independently controlled by two circuits (left and right). The fifth spray zone ⑤ is for cooling the back support roll, including 4 spray beams (upper, lower, left, and right), which share one control circuit. Each of the nine independent control supply circuits is equipped with a pressure sensor (PT), totaling nine, for detecting the emulsion pressure on the pipeline. Each circuit is also equipped with a regulating valve (YGP), totaling nine, for control switching and flow regulation. In addition, except for the back support roller cooling circuit in the fifth spray zone, there are drain valves (YV) for the bypass of the other eight supply circuits, totaling eight, for bypassing the supply pipeline to drain the liquid to the sludge tank. In order to improve the accuracy of the emulsion supply flow control, flow meters (BQ) have been added to the four circuits for roller gap lubrication in the first spray zone and strip cooling in the third spray zone, totaling four, for closed-loop flow control in the first and third spray zones.

[0026] In actual production, the required emulsion volume for each circuit is first calculated based on the rolling schedule and the heating strategy for each pass (as shown in Table 1). Then, the opening of the regulating valve is controlled according to the set values ​​of each circuit to achieve flow control. The second, fourth, and fifth spray zones indirectly control the flow rate in the circuit through pressure control, while the first and third spray zones directly control the flow rate in the circuit through a closed-loop flow meter, undertaking the main task of heating control. The second spray zone, used for cooling the lower roll, can have a fixed flow rate, and the fifth spray zone, used for cooling the back support roll, typically has a fixed flow rate. If temperature deviations occur during rolling, the set values ​​of the corresponding circuits can be manually adjusted to achieve fine-tuning of the temperature.

[0027] This invention provides an emulsion injection and control system for a 20-roll mill, which includes 5 injection zones and 9 independent flow-controlled emulsion supply circuits. These include a first and third injection zone with direct flow control, which are mainly responsible for heating and rolling; a fourth injection zone, which mainly uses a large flow rate for cooling; and a second and fifth injection zone with a basically fixed flow rate, which are used for roll cooling.

[0028] By controlling the flow rates of the first and third spray zones using the aforementioned spray system, the strip can be heated and rolled in the first few passes, with the highest strip temperature reaching over 200°C. In subsequent passes, the strip temperature is rapidly reduced to the normal exit temperature using a large flow rate of emulsion. After that, the strip is rolled at or below the normal temperature in subsequent passes.

[0029] Table 1: Emulsion distribution for each pass in a typical rolling process (the first pass is rolled from left to right).

[0030]

[0031] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A single-stand 20-roll reversible cold rolling mill emulsion spraying and control system, characterized in that: The system comprises five spray zones: a first spray zone, a second spray zone, a third spray zone, a fourth spray zone, and a fifth spray zone. The first spray zone is used for lubrication and cooling of the work roll gap; the second spray zone is used for cooling the roll between the intermediate roll and the work roll; the third and fourth spray zones are used for strip cooling; the spray head in the third spray zone is located between the spray heads in the work roll and the fourth spray zone; and the fifth spray zone is used for cooling the back support roll. The first spray zone includes four spray beams (up, down, left, and right). The left upper and lower spray beams share a first control path, while the right upper and lower spray beams share a second control path. The first spray zone is independently controlled by the left and right channels. The second spray zone also includes four spray beams (up, down, left, and right). The system consists of four spray beams: the upper left and right spray beams share a third control path, the lower left and right spray beams share a fourth control path, and the second spray zone is independently controlled by the upper and lower control paths; the third spray zone includes four spray beams: the left upper and lower spray beams share a fifth control path, the right upper and lower spray beams share a sixth control path, and the third spray zone is independently controlled by the left and right control paths; the fourth spray zone includes four spray beams: the left upper and lower spray beams share a seventh control path, the right upper and lower spray beams share an eighth control path, and the fourth spray zone is independently controlled by the left and right control paths; and the fifth spray zone includes four spray beams: the upper, lower, left, and right spray beams share a ninth control path. The second, fourth, and fifth injection zones indirectly control the flow rate in the control loop through pressure control, while the first and third injection zones directly control the flow rate in the closed-loop control loop through flow meters. The first and third spray zones are used for direct flow control during heated rolling, the fourth spray zone is used for high-flow cooling, and the second and fifth spray zones are used for basic fixed flow rate cooling of the rolls.

2. The emulsion spraying and control system for a single-stand twenty-roll reversible cold rolling mill as described in claim 1, characterized in that: The first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth supply lines are independent of each other. Each of the supply lines is equipped with a pressure sensor (PT) to detect the emulsion pressure on the line.

3. The emulsion spraying and control system for a single-stand twenty-roll reversible cold rolling mill as described in claim 2, characterized in that: The supply lines for the first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth lines are all equipped with regulating valves (YGPs), which are used to control the switching and flow regulation.

4. The emulsion spraying and control system for a single-stand twenty-roll reversible cold rolling mill as described in claim 3, characterized in that: Drain valves (YV) are installed on the bypass lines of the supply pipelines of lines 1, 2, 3, 4, 5, 6, 7, and 8. The drain valves (YV) are used to drain liquid from the bypass lines of the supply pipelines to the waste liquid tank.

5. The emulsion spraying and control system for a single-stand twenty-roll reversible cold rolling mill as described in claim 4, characterized in that: Flow meters (BQ) are installed on the supply lines of the first, second, fifth, and sixth lines. The flow meters (BQ) are used for closed-loop flow control.

6. The emulsion spraying and control system for a single-stand twenty-roll reversible cold rolling mill as described in claim 5, characterized in that: The required amount of emulsion for each pipeline is calculated based on the rolling process and the heating strategy for each pass. Then, the opening of the regulating valve (YGP) is controlled according to the set value of each loop to achieve flow control.

7. The emulsion spraying and control system for a single-stand twenty-roll reversible cold rolling mill as described in claim 6, characterized in that: If temperature deviation occurs during rolling, the set value of the corresponding circuit is manually adjusted to achieve fine-tuning of the temperature.

8. The emulsion spraying and control system for a single-stand twenty-roll reversible cold rolling mill as described in claim 7, characterized in that: Controlling the flow rate in the first and third spray zones allows for the initial heating and rolling of the strip, with the highest strip temperature reaching over 200°C. In subsequent passes, a large flow rate of emulsion rapidly lowers the strip temperature to the normal exit temperature, and thereafter, the temperature is maintained or lower than the normal temperature during rolling.

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