Hydraulic control loop for edging roller of hot mill

Abstract

The utility model belongs to the technical field of hydraulic control, and particularly discloses a hydraulic control loop for an edging roller of a hot mill, a first hydraulic control loop comprises a proportional servo valve B, a port A of the proportional servo valve B is connected with a piston cavity of a hydraulic cylinder B, and a port P and a port T of the proportional servo valve B are correspondingly connected with public ports P1 and T1 respectively. An overflow valve B is arranged between a port A of the proportional servo valve B and the hydraulic cylinder B, an inlet of the overflow valve B is connected with the port A of the proportional servo valve B, and an outlet of the overflow valve B is connected with an oil return port T1; the second hydraulic control loop comprises a pressure reducing valve, an outlet of the pressure reducing valve is connected with a piston rod cavity of the hydraulic cylinder B, and an inlet and a leakage opening of the pressure reducing valve are correspondingly connected with the public opening P1 and the public opening T1 respectively. And meanwhile, the rolling force control precision of the edging roller is improved, the yield and the edge quality of hot-rolled coils are guaranteed, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic control, and specifically discloses a hydraulic control circuit for an edge rolling roll of a hot rolling mill. Background Art

[0002] In the process of hot rolling of non-ferrous metals, it is necessary to use the edge rolling roll device of the hot rolling mill to roll the edge of the strip to limit the spread. The edge rolling thickness is 11 - 250 mm, and the width is 350 - 700 mm. In the prior art, the edge rolling roll device of the hot rolling mill rolls the edge in the following way. When the edge rolling command of the edge rolling roll of the hot rolling mill is issued, the edge rolling width W is given through the control logic, and the hydraulic control circuit only needs to keep the edge rolling width constant.

[0003] In the prior art, the hydraulic control circuit of the edge rolling roll device of the non-ferrous metal processing equipment hot rolling mill, as Figure 1 shown, includes a proportional servo valve A1, a hydraulic control check valve A2, an electromagnetic reversing valve 3, a hydraulic control check valve B4, a check valve A5, a relief valve A6, a pressure sensor A7, a displacement sensor A8, and a hydraulic cylinder A9. The hydraulic cylinder A9 drives the edge rolling roll 10. Since the control circuit selects a switching valve composed of the electromagnetic reversing valve 3, the hydraulic control check valve A2, and the hydraulic control check valve B4, that is to say, the premise for the proportional servo valve A1 to work is that the electromagnetic reversing valve 3, the hydraulic control check valve A2, and the hydraulic control check valve B4 must work. In the actual production process, the electromagnetic reversing valve 3 and the pump station oil source form an interlock. As long as the pump station is started, the electromagnetic reversing valve 3 is energized to work, and when the pump station stops, the electromagnetic reversing valve 3 is de-energized. In addition, the function of the check valve A5 is not great. It is only started when the edge rolling roll device suddenly moves passively to one side and needs to replenish oil, but this kind of phenomenon will not occur in the actual production process because the strip is soft during hot rolling, that is, the rolling force on one side will not be suddenly transmitted to the other side. The hydraulic control circuit of the edge rolling roll device of the hot rolling mill in the prior art has many valves and high prices, resulting in an increase in the pre-construction cost and the cost of transformation and upgrading of the project, wasting the financial and material resources of the enterprise, and the enterprise efficiency is not high.

[0004] In addition, in the prior art, since the control circuit of the edge rolling roll device of the hot rolling mill selects the A and B chambers of the proportional servo valve A1 to simultaneously control the piston chamber and the piston rod chamber of the hydraulic cylinder A9, the output force of the hydraulic cylinder A9 is unstable during the actual control process. When pressure closed-loop control is required, it cannot be accurately controlled, resulting in being unable to do what one wishes when using pressure for monitoring. Summary of the Invention

[0005] To solve the problems in the background art, the utility model discloses a hydraulic control circuit for the edge rolling roll of a hot rolling mill. By using a pressure reducing valve as a back pressure valve, the piston rod chamber of hydraulic cylinder B is connected to the outlet of the pressure reducing valve, and the piston chamber of hydraulic cylinder B is connected to port A of proportional servo valve B. The design is reasonable and the operation is reliable, improving the control accuracy of the rolling force of the edge rolling roll and reducing the one-time construction cost and maintenance cost of the enterprise.

[0006] To achieve the above invention purpose, the utility model adopts the following technical solutions:

[0007] A hydraulic control circuit for the edge rolling roll of a hot rolling mill includes hydraulic cylinder B for driving the edge rolling roll, and also includes a first hydraulic control circuit for controlling the extension of the edge rolling roll and a second hydraulic control circuit for controlling the retraction of the edge rolling roll.

[0008] The first hydraulic control circuit includes proportional servo valve B. Port A of proportional servo valve B is connected to the piston chamber of hydraulic cylinder B, and ports P and T of proportional servo valve B are respectively connected to common ports P1 and T1 correspondingly. An overflow valve B is arranged between port A of proportional servo valve B and hydraulic cylinder B. The inlet of overflow valve B is connected to port A of proportional servo valve B, and the outlet of overflow valve B is connected to the oil return port T1.

[0009] The second hydraulic control circuit includes a pressure reducing valve. The outlet of the pressure reducing valve is connected to the piston rod chamber of hydraulic cylinder B, and the inlet and leakage port of the pressure reducing valve are respectively connected to common ports P1 and T1 correspondingly.

[0010] Further, in the hydraulic control circuit for the edge rolling roll of the hot rolling mill, a displacement sensor B for measuring the displacement of the piston rod of hydraulic cylinder B is arranged near hydraulic cylinder B.

[0011] Further, in the hydraulic control circuit for the edge rolling roll of the hot rolling mill, the actual rolling force of the edge rolling roll is equal to the pressure difference between proportional servo valve B and the pressure reducing valve.

[0012] Further, in the hydraulic control circuit for the edge rolling roll of the hot rolling mill, when the pressure value generated in the piston chamber of hydraulic cylinder B is greater than the pressure value generated in the piston rod chamber of hydraulic cylinder B by the second hydraulic control circuit, the edge rolling roll extends to clamp the strip to limit the width spread.

[0013] Further, in the hydraulic control circuit for the edge rolling roll of the hot rolling mill, when the pressure value generated in the piston chamber of hydraulic cylinder B is less than the pressure value generated in the piston rod chamber of hydraulic cylinder B by the second control circuit, the edge rolling roll retracts away from the strip.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The hydraulic control circuit of the edge rolling roll of the hot rolling mill of the utility model changes the switching valve composed of an electromagnetic reversing valve, a hydraulic control check valve A, a hydraulic control check valve B and a check valve A in the prior art into a pressure reducing valve. The piston rod cavity of the hydraulic cylinder B is connected to the outlet of the pressure reducing valve, and the piston cavity of the hydraulic cylinder B is connected to the port A of the proportional servo valve B. The working principle is simple, the design is reasonable, and the operation is reliable. It meets the requirements of the unit for producing different casting materials, ensures the rationality and stability of the width expansion of the hot rolled coil strip, improves the control accuracy of the rolling force of the edge rolling roll, ensures the yield and edge quality of the hot rolled coil, further reduces the one-time construction cost and maintenance cost of the enterprise, and improves the production efficiency at the same time. Brief Description of the Drawings

[0016] Figure 1 is a schematic diagram of the hydraulic control circuit of the edge rolling roll device of the hot rolling mill in the prior art;

[0017] Figure 2 is a schematic diagram of the hydraulic control circuit of the edge rolling roll device of the hot rolling mill of the utility model;

[0018] In the figure: 1 - proportional servo valve A; 2 - hydraulic control check valve A; 3 - electromagnetic reversing valve; 4 - hydraulic control check valve B; 5 - check valve A; 6 - relief valve A; 7 - pressure sensor A; 8 - displacement sensor A; 9 - hydraulic cylinder A; 10 - edge rolling roll; 11 - proportional servo valve B; 12 - pressure reducing valve; 13 - relief valve B; 14 - hydraulic cylinder B; 15 - displacement sensor B. Detailed Embodiment

[0019] In order to better understand the utility model, the content of the utility model will be further clarified below in conjunction with embodiments, but the content of the utility model is not limited to the following embodiments.

[0020] Combined with the attached Figure 2 , a hydraulic control circuit of the edge rolling roll of a hot rolling mill of the utility model is elaborated in detail, which includes a hydraulic cylinder B14 for driving the edge rolling roll 10, and also includes a first hydraulic control circuit for controlling the extension of the edge rolling roll 10 and a second hydraulic control circuit for controlling the retraction of the edge rolling roll 10.

[0021] The first hydraulic control circuit includes a proportional servo valve B11. The port A of the proportional servo valve B11 is connected to the piston cavity of the hydraulic cylinder B14. The P port and the T port of the proportional servo valve B11 are respectively connected to the common ports P1 and T1 correspondingly. A relief valve B13 is arranged between the port A of the proportional servo valve B11 and the hydraulic cylinder B14. The inlet of the relief valve B13 is connected to the port A of the proportional servo valve B11, and the outlet of the relief valve B13 is connected to the return oil T1 port.

[0022] The second hydraulic control circuit includes a pressure reducing valve 12. The outlet of the pressure reducing valve 12 is connected to the piston rod chamber of the hydraulic cylinder B14. The inlet and the leakage port of the pressure reducing valve 12 are respectively and correspondingly connected to the common port P1 and T1. Other settings are conventional settings.

[0023] When the rolling edge command of the rolling edge roll 10 of the hot rolling mill is issued, the PA oil circuit of the proportional servo valve B11 is connected. The back pressure of the piston rod chamber of the hydraulic cylinder B14 is provided by the pressure reducing valve 12. The control oil enters the piston chamber of the hydraulic cylinder B14, and the piston rod of the hydraulic cylinder B14 extends to control the rolling edge roll 10 to extend; conversely, when the AT oil circuit of the proportional servo valve B11 is connected, the control oil flows out from the piston chamber of the hydraulic cylinder B14, and the oil source enters the piston rod chamber of the hydraulic cylinder B14 from the common port P1 through the outlet of the pressure reducing valve 12, and the piston rod retracts to control the rolling edge roll 10 to retract.

[0024] The hydraulic control circuit of the rolling edge roll of the hot rolling mill disclosed by the present utility model has a simple working principle, reasonable design, and reliable operation. It can meet the requirements of the unit for producing different casting materials, ensure the rationality and stability of the width spread of the hot rolled coil strip, improve the control precision of the rolling force of the rolling edge roll at the same time, ensure the yield and edge quality of the hot rolled coil, further reduce the one-time construction cost and maintenance cost of the enterprise, and improve the production efficiency at the same time.

[0025] As an optional design, it is preferred that for the hydraulic control circuit of the rolling edge roll of the hot rolling mill, a displacement sensor B15 for measuring the displacement of the piston rod of the hydraulic cylinder B14 is provided at a position adjacent to the hydraulic cylinder B14. The precise displacement of the piston rod of the hydraulic cylinder B14 is jointly determined by the proportional servo valve B11 and the displacement sensor B15.

[0026] As an optional design, it is preferred that for the hydraulic control circuit of the rolling edge roll of the hot rolling mill, the actual rolling force of the rolling edge roll 10 is equal to the pressure difference between the proportional servo valve B11 and the pressure reducing valve 12.

[0027] As an optional design, it is preferred that for the hydraulic control circuit of the rolling edge roll of the hot rolling mill, when the pressure value generated in the piston chamber of the hydraulic cylinder B14 is greater than the pressure value generated in the piston rod chamber of the hydraulic cylinder B14 by the second hydraulic control circuit, the rolling edge roll 10 extends to clamp the strip to limit the width spread.

[0028] As an optional design, it is preferred that for the hydraulic control circuit of the rolling edge roll of the hot rolling mill, when the pressure value generated in the piston chamber of the hydraulic cylinder B14 is less than the pressure value generated in the piston rod chamber of the hydraulic cylinder B14 by the second control circuit, the rolling edge roll 10 retracts away from the strip.

[0029] The working process of the present utility model is as follows:

[0030] The first hydraulic control circuit controls the extension of the edge rolling roll device, and this control circuit is implemented as follows: when PA and BT of the proportional servo valve B11 are connected, when the pressure value generated in the piston chamber of the hydraulic cylinder B14 is greater than the pressure value generated in the rod chamber of the hydraulic cylinder B14 by the second hydraulic control circuit, the edge rolling roll device extends to clamp the strip to limit the width spread;

[0031] When the edge rolling roll device clamps the strip, the magnitude of the edge rolling force depends on the setting of the proportional servo valve B11. The setting value of the pressure reducing valve 12 in the second hydraulic control circuit depends on the friction force when the edge rolling roll device returns (opens). The setting value of the pressure reducing valve 12 in the second hydraulic control circuit is approximately 1.2 times the friction force value. The actual rolling force of the edge rolling roll device is equal to the pressure difference between the proportional servo valve B11 and the pressure reducing valve 12.

[0032] The second hydraulic control circuit controls the retraction (release) of the edge rolling roll device, and this control circuit is implemented as follows: when PB and AT of the proportional servo valve B11 are connected, when the pressure value generated in the piston chamber of the hydraulic cylinder B14 is less than the pressure value generated in the rod chamber of the hydraulic cylinder B14 by the second control circuit, the edge rolling roll device retracts away from the strip. The outlet of the pressure reducing valve 12 is connected to the piston rod chamber of the hydraulic cylinder B14, and the inlet is connected to the common P1 port. The setting value of this valve is approximately 1.2 times the friction force when the edge rolling roll device is released.

[0033] The above description is only the application implementation mode of the present utility model, but the protection scope of the present utility model is not limited thereto. The scope of rights of the present utility model cannot be limited by this. Any equivalent changes made according to the technical solution of the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A hot rolling mill edge rolling roller hydraulic control circuit, comprising a hydraulic cylinder B driving the edge rolling roller, characterized in that: It also includes a first hydraulic control circuit for controlling the extension of the edge rolling roller and a second hydraulic control circuit for controlling the retraction of the edge rolling roller. The first hydraulic control circuit includes a proportional servo valve B, wherein the port A of the proportional servo valve B is connected to the piston chamber of the hydraulic cylinder B, the port P and the port T of the proportional servo valve B are respectively connected to the common ports P1 and T1, and an overflow valve B is provided between the port A of the proportional servo valve B and the hydraulic cylinder B, the inlet of the overflow valve B is connected to the port A of the proportional servo valve B, and the outlet of the overflow valve B is connected to the oil return port T1; The second hydraulic control circuit includes a pressure reducing valve, the outlet of the pressure reducing valve is connected to the piston rod chamber of the hydraulic cylinder B, and the inlet and leakage port of the pressure reducing valve are connected to the common ports P1 and T1 respectively.

2. The hot rolling mill edge rolling roller hydraulic control circuit according to claim 1 is characterized in that: A displacement sensor B for measuring the displacement of the piston rod of the hydraulic cylinder B is provided at a position adjacent to the hydraulic cylinder B.

3. The hot rolling mill edge rolling roller hydraulic control circuit according to claim 1 or 2, characterized in that: The actual rolling force of the edge rolling roller is equal to the pressure difference between the proportional servo valve B and the pressure reducing valve.

4. The hot rolling mill edge rolling roller hydraulic control circuit according to claim 3 is characterized in that: When the pressure value generated by the piston chamber of hydraulic cylinder B is greater than the pressure value generated by the second hydraulic control circuit in the piston rod chamber of hydraulic cylinder B, the edge rolling roller extends to clamp the strip to limit its width.

5. The hot rolling mill edge rolling roller hydraulic control circuit according to claim 3 is characterized in that: When the pressure value generated by the piston chamber of hydraulic cylinder B is less than the pressure value generated by the second control circuit in the piston rod chamber of hydraulic cylinder B, the edge rolling roller retracts away from the strip.

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