An edger roll lift control system

Abstract

The application relates to a vertical roller lifting control system, which relates to the field of hydraulic control systems and comprises an oil inlet pipeline, an oil return pipeline and a lifting hydraulic cylinder, the oil inlet pipeline and the oil return pipeline are connected with a rod cavity and a rodless cavity of the lifting hydraulic cylinder through a control assembly, the control assembly is used for converting oil supply and oil return of the rod cavity and the rodless cavity; a three-way pressure reducing valve is arranged on a pipeline between the oil inlet pipeline and the control assembly, the three-way pressure reducing valve is arranged on a pipeline on a rodless cavity side of the lifting hydraulic cylinder, the three-way pressure reducing valve is communicated with the oil return pipeline, a drain pipeline is further connected to the three-way pressure reducing valve, and the three-way pressure reducing valve is used for adjusting internal system pressure during rolling. Through arrangement of the three-way pressure reducing valve, during rolling, the three-way pressure reducing valve can well cope with load changes, a stable force is provided for a cylinder rod of the lifting hydraulic cylinder, and the cylinder rod of the lifting hydraulic cylinder can stably work during rolling.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of hydraulic control system, in particular to a vertical roll lifting control system. BACKGROUND

[0002] Hot-rolled strip steel is one of the main products of steel products, widely used in industry, agriculture transportation and construction industry, the width control of hot-rolled strip steel product is the core of the control of vertical roll mill in rough rolling, and the hydraulic control of vertical roll lifting in vertical roll mill is an important part of work.

[0003] The vertical roll hydraulic cylinder control system is mainly composed of a transmission side vertical roll hydraulic cylinder working circuit and an operation side vertical roll hydraulic cylinder working circuit. Under the action of the hydraulic control system, the vertical roll hydraulic cylinder generates force by pushing or pulling oil into or out of the piston to realize the forward and backward functions of the vertical roll. The vertical roll hydraulic cylinder has two working states, roll changing and normal rolling.

[0004] The existing vertical roll hydraulic cylinder control system provides a constant force during roll changing and normal rolling. During roll changing, the vertical roll hydraulic cylinder rod retracts to lift the universal shaft, and after the roll changing is completed, the vertical roll hydraulic cylinder rod extends to the rolling position for rolling. Since the universal shaft is a constant device, the vertical roll hydraulic cylinder control system provides a constant force. During rolling, the vertical roll hydraulic cylinder rod extends to roll the billet. The billet needs to be rolled several times, and during rolling, the width and thickness of the billet change. With the change of the contact surface of the billet, the rolling pressure changes, and the reaction force generated by the billet rolling acts on the cylinder rod of the vertical roll hydraulic cylinder. Since the vertical roll hydraulic cylinder control system provides a constant force, the force provided by the vertical roll hydraulic cylinder to the cylinder rod cannot change with the change of the load, so that a stable force cannot be provided to the cylinder rod of the hydraulic cylinder, and the cylinder rod of the vertical roll hydraulic cylinder cannot work stably during rolling. Therefore, it is urgent to develop a vertical roll hydraulic cylinder control system that can cope with the load change during rolling. SUMMARY

[0005] In order to develop a vertical roll hydraulic cylinder control system that can cope with the load change during rolling, the present application provides a vertical roll lifting control system.

[0006] The vertical roll lifting control system provided by the present application adopts the following technical scheme:

[0007] The vertical roll lifting control system comprises an oil inlet pipeline, an oil return pipeline and a lifting hydraulic cylinder, the oil inlet pipeline and the oil return pipeline are connected with the rod cavity and the rodless cavity of the lifting hydraulic cylinder through a control assembly, and the control assembly is used for switching the oil supply and return of the rod cavity and the rodless cavity; a three-way pressure reducing valve is arranged on the pipeline between the oil inlet pipeline and the control assembly, the three-way pressure reducing valve is arranged on the pipeline on the side of the rodless cavity of the lifting hydraulic cylinder, the three-way pressure reducing valve is communicated with the oil return pipeline, a drain pipeline is further connected to the three-way pressure reducing valve, and the three-way pressure reducing valve is used for adjusting the internal pressure of the system in the rolling state.

[0008] In a specific implementation, the control assembly comprises a second control member and a first control member connected with the three-way pressure reducing valve, the first control member is used for controlling the pipeline on-off in the rolling state of the lifting hydraulic cylinder, and the second control member is used for controlling the pipeline on-off in the roll changing state of the lifting hydraulic cylinder.

[0009] In a specific implementation, the first control member comprises a first electromagnetic reversing valve arranged on the pipeline between the three-way pressure reducing valve and the lifting hydraulic cylinder, the first electromagnetic reversing valve is communicated with the oil return pipeline, and a hydraulic control check valve is arranged on the pipeline between the first electromagnetic reversing valve and the lifting hydraulic cylinder.

[0010] In a specific implementation, a third electromagnetic reversing valve is arranged on the pipeline between the hydraulic control check valve and the oil inlet pipeline, and the third electromagnetic reversing valve is communicated with the oil return pipeline.

[0011] In a specific implementation, the second control member comprises a second electromagnetic reversing valve, the second electromagnetic reversing valve is communicated with the oil inlet pipeline, the oil return pipeline and the lifting hydraulic cylinder, a superimposed hydraulic control check valve and a superimposed one-way throttling valve are sequentially arranged on the pipeline between the second electromagnetic reversing valve and the lifting hydraulic cylinder.

[0012] In a specific implementation, a pressure relay is further arranged on the pipeline between the superimposed one-way throttling valve and the rod cavity of the lifting hydraulic cylinder, and the pressure relay is communicated with the oil return pipeline.

[0013] In a specific implementation, an insertion type overflow valve is further arranged on the pipeline between the pressure relay and the oil return pipeline.

[0014] In a specific implementation, a high-pressure ball valve is arranged on the pipeline between the oil inlet pipeline and the three-way pressure reducing valve, and the pipeline connecting the rod cavity and the rodless cavity of the lifting hydraulic cylinder.

[0015] In one specific implementation, a pressure tap is arranged on the pipeline connecting the rod cavity and the rodless cavity of the lifting hydraulic cylinder, and a pressure measuring hose assembly is arranged in cooperation with the pressure tap, and a pressure gauge is connected to the pressure measuring hose assembly.

[0016] In one specific implementation, a pipe check valve is arranged on the pipeline between the oil return pipeline and the three-way pressure reducing valve.

[0017] Compared with the prior art, the present application has the following advantages:

[0018] The vertical roller lifting control system adds a three-way pressure reducing valve to the rodless cavity, and when the rodless cavity is supplied with oil, the system oil source will first pass through the three-way pressure reducing valve, the three-way pressure reducing valve can provide a suitable force according to the needs of roller adjustment, and the three-way pressure reducing valve can adjust the pressure required by the rodless cavity of the lifting hydraulic cylinder in the rolling state, so that the system in this working state can better adapt to the load, thereby providing a stable force to the rod cavity of the lifting hydraulic cylinder, so that the cylinder rod of the lifting hydraulic cylinder can stably work in the rolling process; the control of the vertical roller lifting control system is more reasonable and more suitable for actual use. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic diagram of a vertical roller lifting control system according to an embodiment of the present application.

[0020] Marked: 1, oil inlet pipeline; 2, oil return pipeline; 3, lifting hydraulic cylinder; 4, three-way pressure reducing valve; 5, oil drain pipeline; 6, first control component; 61, first electromagnetic directional valve; 62, hydraulic control check valve; 63, third electromagnetic directional valve; 7, second control component; 71, second electromagnetic directional valve; 72, superimposed hydraulic control check valve; 73, superimposed check valve; 74, pressure relay; 75, overflow valve; 8, high-pressure ball valve; 9, pressure tap; 91, pressure measuring hose assembly; 92, pressure gauge; 10, pipe check valve. DETAILED DESCRIPTION

[0021] The following will be described in detail in combination with the accompanying Figure 1 The present application will be further described in detail.

[0022] Reference Figure 1 The vertical roller lifting control system according to an embodiment of the present application comprises an oil inlet pipeline 1, an oil return pipeline 2, and a lifting hydraulic cylinder 3, the oil inlet pipeline 1 and the oil return pipeline 2 are connected to the rod cavity and the rodless cavity of the lifting hydraulic cylinder 3 through a control assembly, and the control assembly is used to switch the oil supply and oil return of the rod cavity and the rodless cavity.

[0023] The control assembly comprises a first control member 6 for controlling the on-off of the pipeline in the rolling state of the lifting hydraulic cylinder 3. A three-way pressure reducing valve 4 is arranged on the pipeline between the first control member 6 and the oil inlet pipeline 1. In the embodiment, the model of the three-way pressure reducing valve 4 is 3DR10P5-6X / 100Y / 00. The three-way pressure reducing valve 4 is arranged on the pipeline on the side of the rodless cavity of the lifting hydraulic cylinder 3. The inlet of the three-way pressure reducing valve 4 is communicated with the oil return pipeline 2 and the oil inlet pipeline 1. The outlet of the three-way pressure reducing valve 4 is further connected with the oil discharge pipeline 5. The three-way pressure reducing valve 4 is used for adjusting the internal pressure of the system in the rolling state.

[0024] A pipe check valve 10 is arranged on the pipeline between the oil return pipeline 2 and the three-way pressure reducing valve 4. In the embodiment, the model of the pipe check valve 10 on the oil return pipeline 2 is S30A12B / . The model of the pipe check valve 10 on the oil discharge pipeline 5 is S15A12B / . A high-pressure ball valve 8 is arranged on the pipeline connecting the rod cavity and the rodless cavity of the lifting hydraulic cylinder 3 and the pipeline between the oil inlet pipeline 1 and the three-way pressure reducing valve 4. In the embodiment, the model of the high-pressure ball valve 8 is DN20. A pressure measuring connector 9 is arranged on the pipeline connecting the rod cavity and the rodless cavity of the lifting hydraulic cylinder 3. In the embodiment, the pressure measuring connector 9 can be but is not limited to a PT-3 pressure measuring connector 9. The pressure measuring connector 9 is further provided with a pressure measuring hose assembly 91. The pressure measuring hose assembly 91 is connected with a pressure gauge 92. In the embodiment, the pressure gauge 92 is a YNIII(0-40)Mpa shockproof pressure gauge.

[0025] With reference to Figure 1 The first control member 6 comprises a first electromagnetic reversing valve 61 arranged on the pipeline between the three-way pressure reducing valve 4 and the lifting hydraulic cylinder 3. In the embodiment, the model of the first electromagnetic reversing valve 61 is 4WE10J31B / CG24N9Z5L. The inlet of the first electromagnetic reversing valve 61 is communicated with the outlet of the three-way pressure reducing valve 4 and the oil return pipeline 2. The outlet of the first electromagnetic reversing valve 61 is communicated with the rod cavity and the rodless cavity of the lifting hydraulic cylinder 3. The first electromagnetic reversing valve 61 is communicated with the oil return pipeline 2. A hydraulic control check valve 62 is arranged on the pipeline between the first electromagnetic reversing valve 61 and the lifting hydraulic cylinder 3. The outlet of the first electromagnetic reversing valve 61 is communicated with the inlet of the hydraulic control check valve 62. In the embodiment, the model of the hydraulic control check valve 62 is SL10PA1-30B. A third electromagnetic reversing valve 63 is arranged on the pipeline between the hydraulic control check valve 62 and the oil inlet pipeline 1. In the embodiment, the model of the third electromagnetic reversing valve 63 is 4WE6D60B / CG24N9Z5L. The third electromagnetic reversing valve 63 is communicated with the oil return pipeline 2.

[0026] With reference to Figure 1, the control assembly further comprises a second control member 7 for controlling the on-off of the pipeline in the roll changing state of the lifting hydraulic cylinder 3. The second control member 7 comprises a second electromagnetic reversing valve 71, in this embodiment, the model of the second electromagnetic reversing valve 71 is 4WE10J31B / CG24N9Z5L. The inlet of the second electromagnetic reversing valve 71 is communicated with the oil inlet pipeline 1 and the oil return pipeline 2. The outlet of the second electromagnetic reversing valve 71 is communicated with the rod cavity and the rodless cavity of the lifting hydraulic cylinder 3. A superimposed hydraulic control check valve 72 and a superimposed check throttle valve 73 are sequentially arranged on the pipeline between the second electromagnetic reversing valve 71 and the lifting hydraulic cylinder 3. In this embodiment, the model of the superimposed hydraulic control check valve 72 is Z2S10-2-30B / , and the model of the superimposed check throttle valve 73 is 2FS10-20B / .

[0027] The superimposed check throttle valve 73 and the pipeline on the side of the rod cavity of the lifting hydraulic cylinder 3 are further provided with a pressure relay 74, which is communicated with the oil return pipeline 2. An insertion type overflow valve 75 is further arranged on the pipeline between the pressure relay 74 and the oil return pipeline 2. In this embodiment, the model of the insertion type overflow valve 75 is DBDS10K10B / 315. The insertion type overflow valve 75 can realize the effect of overload protection of the rod cavity of the lifting hydraulic cylinder 3.

[0028] The implementation principle of the vertical roll lifting control system in this embodiment is as follows: the lifting hydraulic cylinder 3 has two working states, roll changing and normal rolling, which are controlled by two circuits. In the normal rolling process, the electromagnet 9DT of the first electromagnetic reversing valve 61 and the electromagnet 10DT of the third electromagnetic reversing valve 63 are powered. After the high-pressure oil enters the valve platform through the high-pressure ball valve 8 on the oil inlet pipeline 1, it is reduced to about 2-5 MPa through the three-way pressure reducing valve 4. At this time, the P port and the B port of the first electromagnetic reversing valve 61 are connected, that is, the 2-5 MPa pressure oil after pressure reduction enters the rod cavity of the lifting hydraulic cylinder 3. The A port of the first electromagnetic reversing valve 61 is connected with the oil return pipeline 2, and a pulling force opposite to the rolling force is generated. Since the rough rolling vertical roll is reversible, a steel billet needs to be rolled several times, and the width and thickness change in the rolling process. At this time, the three-way pressure reducing valve 4 can well meet the needs of the actual situation. In the process of the steel billet entering the rolling mill, the reaction force generated by the roll acts on the vertical roll lifting hydraulic cylinder 3. At this time, the three-way pressure reducing valve 4 can well cope with the change of the load, and a stable force is applied to the rod of the rod cavity of the lifting hydraulic cylinder 3, so that the rod of the lifting hydraulic cylinder 3 can stably work in the rolling process.

[0029] When the roll is changed, the electromagnet 7DT of the second electromagnetic reversing valve 71 is electrified, the cylinder rod of the vertical roll lifting hydraulic cylinder 3 is retracted to lift the universal shaft, after the roll is changed, the electromagnet 6DT of the second electromagnetic reversing valve 71 is electrified, the cylinder rod of the vertical roll lifting hydraulic cylinder 3 is extended to adjust to the rolling position; since only the universal shaft needs to be lifted when the roll is changed, the pressure at this time is the constant pressure of the hydraulic system, that is, the constant pressure of the hydraulic system can be used;

[0030] The vertical roll lifting control system of the application can provide a suitable pressure according to the actual needs of the roll system adjustment during rolling, so that the system can better adapt to the load, the control is more reasonable, the actual use can be better met, the energy saving is better, and the influence on the mechanical equipment is reduced.

[0031] The above are preferred embodiments of the application, which do not limit the protection scope of the application, therefore: any equivalent changes made on the structure, shape and principle of the application should be covered within the protection scope of the application.

Claims

1. A vertical roller lifting control system, characterized in that: The system includes an oil inlet pipe (1), an oil return pipe (2), and a lifting hydraulic cylinder (3). The oil inlet pipe (1) and the oil return pipe (2) are connected to the rod chamber and rodless chamber of the lifting hydraulic cylinder (3) through a control component. The control component is used to switch the oil supply and return between the rod chamber and the rodless chamber. A three-way pressure reducing valve (4) is provided on the pipe between the oil inlet pipe (1) and the control component. The three-way pressure reducing valve (4) is located on the pipe on the rodless chamber side of the lifting hydraulic cylinder (3). The three-way pressure reducing valve (4) is connected to the oil return pipe (2). An oil drain pipe (5) is also connected to the three-way pressure reducing valve (4). The three-way pressure reducing valve (4) is used to adjust the internal pressure of the system during rolling. The control component includes a second control element (7) and a control element connected to the three-way pressure reducing valve (4). The first control component (6) is used to control the opening and closing of the pipeline when the lifting hydraulic cylinder (3) is in the rolling state, and the second control component (7) is used to control the opening and closing of the pipeline when the lifting hydraulic cylinder (3) is in the roll changing state; the first control component (6) includes a first electromagnetic directional valve (61) disposed on the pipeline between the three-way pressure reducing valve (4) and the lifting hydraulic cylinder (3), the first electromagnetic directional valve (61) is connected to the return oil pipeline (2), and a hydraulic control check valve (62) is provided on the pipeline between the first electromagnetic directional valve (61) and the lifting hydraulic cylinder (3); a third electromagnetic directional valve (63) is provided on the pipeline between the hydraulic control check valve (62) and the oil inlet pipeline (1), and the third electromagnetic directional valve (63) is connected to the return oil pipeline (2).

2. The vertical roller lifting control system according to claim 1, characterized in that: The second control component (7) includes a second electromagnetic directional valve (71), which is connected to the oil inlet pipeline (1), the oil return pipeline (2) and the lifting hydraulic cylinder (3). A stacked hydraulic control check valve (72) and a stacked one-way throttle valve (73) are sequentially provided on the pipeline between the second electromagnetic directional valve (71) and the lifting hydraulic cylinder (3).

3. The vertical roller lifting control system according to claim 2, characterized in that: A pressure relay (74) is also provided between the superimposed one-way throttle valve (73) and the pipeline on the rod chamber side of the lifting hydraulic cylinder (3), and the pressure relay (74) is connected to the return oil pipeline (2).

4. The vertical roller lifting control system according to claim 3, characterized in that: An insert-type overflow valve (75) is also provided on the pipeline between the pressure relay (74) and the return oil pipeline (2).

5. The vertical roller lifting control system according to claim 1, characterized in that: High-pressure ball valves (8) are provided on the pipelines connecting the rod chamber and rodless chamber of the lifting hydraulic cylinder (3), and on the pipeline between the oil inlet pipeline (1) and the three-way pressure reducing valve (4).

6. The vertical roller lifting control system according to claim 1, characterized in that: Pressure testing connectors (9) are provided on the pipes connecting the rod chamber and the rodless chamber of the lifting hydraulic cylinder (3). The pressure testing connectors (9) are also equipped with pressure testing hose assemblies (91), and pressure gauges (92) are connected to the pressure testing hose assemblies (91).

7. The vertical roller lifting control system according to claim 1, characterized in that: A pipe-type check valve (10) is provided on both the return oil line (2) and the drain oil line (5) between the three-way pressure reducing valve (4).

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