阅读说明：本技术 一种控制冷轧单机架模拟器张力的液压系统及其方法 (Hydraulic system and method for controlling tension of cold rolling single-rack simulator ) 是由 王炳奎 王策 王凤琴 刘子英 张长利 于 2020-06-08 设计创作，主要内容包括：本发明公开了一种控制冷轧单机架模拟器张力的液压系统及其方法,包括：轧机,测速器、张力计均为两个分别设置在轧机的两侧,用于测试带钢轧制速度、张力；液压油缸与张力计连接包括第一、第二液压油缸,第一液压油缸与带钢的一端连接；第二液压油缸与带钢的另一端连接；伺服阀与液压油缸连接用于控制液压油缸的伸出与收缩,所述油泵包括存储加载油泵,所述存储加载油泵与所述伺服阀连接。解决了现有技术中的冷轧单机架模拟器存在张力控制稳定性差,而影响实验数据的可靠性和稳定性的技术问题。达到了通过精准控制前后拉力油缸的拉力大小,精准把握在固定前张力、固定后张力和固定张力差等影响,提高实验数据的可靠性和稳定性的技术效果。(The invention discloses a hydraulic system and a method for controlling tension of a cold rolling single-rack simulator, wherein the hydraulic system comprises the following steps: the rolling mill, velometer, tensiometer are two and set up in both sides of the rolling mill separately, is used for testing the rolling speed of the strip steel, tension; the hydraulic oil cylinder is connected with the tension meter and comprises a first hydraulic oil cylinder and a second hydraulic oil cylinder, and the first hydraulic oil cylinder is connected with one end of the strip steel; the second hydraulic cylinder is connected with the other end of the strip steel; the servo valve is connected with the hydraulic oil cylinder and used for controlling the extension and contraction of the hydraulic oil cylinder, the oil pump comprises a storage loading oil pump, and the storage loading oil pump is connected with the servo valve. The technical problem that the reliability and the stability of experimental data are influenced due to poor tension control stability of a cold rolling single-rack simulator in the prior art is solved. The technical effects of accurately controlling the tension of the front tension oil cylinder and the rear tension oil cylinder, accurately controlling the influences of tension before fixing, tension after fixing, fixed tension difference and the like, and improving the reliability and stability of experimental data are achieved.)

1. A hydraulic system for controlling tension in a cold rolling single stand simulator, the system comprising:

a rolling mill through which a strip steel is rolled;

the two speed measuring devices are respectively arranged on two sides of the rolling mill and used for detecting the rolling speed of the strip steel;

the tension meters are arranged on two sides of the rolling mill respectively, are connected with the end parts of the strip steel and are used for testing the rolling tension of the strip steel;

the hydraulic oil cylinder is connected with the tensiometer and is provided with an oil inlet cavity and an oil outlet cavity, wherein the hydraulic oil cylinder comprises a first hydraulic oil cylinder and a second hydraulic oil cylinder, the first hydraulic oil cylinder is arranged on one side of the rolling mill, and the first hydraulic oil cylinder is connected with one end of the strip steel;

the second hydraulic cylinder is arranged on the other side of the rolling mill and is connected with the other end of the strip steel;

the servo valves are connected with the hydraulic oil cylinders and used for controlling the extension and contraction of the hydraulic oil cylinders, and the number of the servo valves is four, and the four servo valves are respectively connected with the oil inlet cavity and the oil outlet cavity of the first hydraulic oil cylinder and the oil inlet cavity and the oil outlet cavity of the second hydraulic oil cylinder;

the oil pump, the oil pump is including saving the loading oil pump, save the loading oil pump with the servo valve is connected, does the servo valve fuel feeding.

2. The system of claim 1, wherein the servo valve is a three-position, four-way flow control servo valve.

3. The system of claim 2, wherein the servo valve has a primary spool, and wherein the displacement of the primary spool effects control of the size of the port of the servo valve.

4. The system of claim 1, wherein the system further comprises:

a pilot valve connected with the servo valve.

5. The system of claim 4, wherein the system further comprises:

and the energy accumulator is connected with the pilot valve and supplies oil to the pilot valve in real time.

6. The system of claim 5, wherein the oil pump comprises a control oil pump coupled to the accumulator to provide pilot oil to the pilot valve.

7. The system of claim 1, wherein the system further comprises:

and the safety valve is connected with the oil inlet cavity and the oil outlet cavity of the hydraulic oil cylinder.

8. A control method of a tension hydraulic system of a cold rolling single-stand simulator, which is applied to the system of any one of claims 1 to 7, and comprises the following steps:

obtaining an automation system control instruction;

according to the control instruction of the automatic system, the pilot valve generates pressure difference at the two control oil ports by controlling the displacement of the valve core of the pilot valve, and the main valve core of the servo valve is started to generate displacement under the action of the pressure difference so as to control the pressure generated by the hydraulic oil cylinder;

the rolling mill is driven by power generated by a hydraulic oil cylinder to roll strip steel, and the rolling speed and the tension of the rolling mill are detected in real time by a velometer and a tensiometer on two sides of the rolling mill to obtain detection data;

and feeding back the detection data to a primary model for deviation correction calculation, and controlling a corresponding servo valve of the hydraulic oil cylinder to correct according to the deviation correction data obtained by calculation.

Technical Field

The invention relates to the technical field of steel rolling, in particular to a hydraulic system and a method for controlling tension of a cold rolling single-rack simulator.

Background

At present, most of single-stand reversible rolling is realized by 2 recoiling machines, and the problems of more electric equipment, complex control and larger occupied space exist. The experimental strip steel used for the cold rolling simulator for experiment is about 1500 mm-2500 mm in length and about 450-550 mm in width, so the design with a coiler in the past is not suitable for the cold rolling single stand used for the simulation experiment. And the tension of the strip steel before and after the frame directly influences the stability and the product quality in the rolling process, and when the tension is changed, the rolling force is also changed, so that the thickness of the strip steel is changed, the tolerance of the product is increased due to tension fluctuation, and the shape of the rolled strip steel is also influenced.

Disclosure of Invention

The invention provides a hydraulic system and a method for controlling tension of a cold rolling single-rack simulator, which are used for solving the technical problem that the reliability and stability of experimental data are influenced due to poor tension control stability of the cold rolling single-rack simulator in the prior art.

In order to solve the above technical problem, in a first aspect, the present invention provides a hydraulic system for controlling tension of a cold rolling single stand simulator, the system comprising: a rolling mill through which a strip steel is rolled; the two speed measuring devices are respectively arranged on two sides of the rolling mill and used for detecting the rolling speed of the strip steel; the tension meters are arranged on two sides of the rolling mill respectively, are connected with the end parts of the strip steel and are used for testing the rolling tension of the strip steel; the hydraulic oil cylinder is connected with the tensiometer and is provided with an oil inlet cavity and an oil outlet cavity, wherein the hydraulic oil cylinder comprises a first hydraulic oil cylinder and a second hydraulic oil cylinder, the first hydraulic oil cylinder is arranged on one side of the rolling mill, and the first hydraulic oil cylinder is connected with one end of the strip steel; the second hydraulic cylinder is arranged on the other side of the rolling mill and is connected with the other end of the strip steel; the servo valves are connected with the hydraulic oil cylinders and used for controlling the extension and contraction of the hydraulic oil cylinders, and the number of the servo valves is four, and the four servo valves are respectively connected with the oil inlet cavity and the oil outlet cavity of the first hydraulic oil cylinder and the oil inlet cavity and the oil outlet cavity of the second hydraulic oil cylinder; the oil pump, the oil pump is including saving the loading oil pump, save the loading oil pump with the servo valve is connected, does the servo valve fuel feeding.

Preferably, the servo valve is a three-position four-way flow control servo valve.

Preferably, the servo valve has a main spool, and the control of the size of the port of the servo valve is realized through the displacement of the main spool.

Preferably, the system further comprises: a pilot valve connected with the servo valve.

Preferably, the system further comprises: and the energy accumulator is connected with the pilot valve and supplies oil to the pilot valve in real time.

Preferably, the oil pump further comprises a control oil pump, and the control oil pump is connected with the accumulator and provides pilot oil for the pilot valve.

Preferably, the system further comprises: and the safety valve is connected with the oil inlet cavity and the oil outlet cavity of the hydraulic oil cylinder.

In a second aspect, the invention provides a hydraulic control method for tension of a cold rolling single-rack simulator, which is applied to the system and comprises the following steps: obtaining an automation system control instruction; according to the control instruction of the automatic system, the pilot valve generates pressure difference at the two control oil ports by controlling the displacement of the valve core of the pilot valve, and the main valve core of the servo valve is started to generate displacement under the action of the pressure difference so as to control the pressure generated by the hydraulic oil cylinder; the rolling mill is driven by power generated by a hydraulic oil cylinder to roll strip steel, and the rolling speed and the tension of the rolling mill are detected in real time by a velometer and a tensiometer on two sides of the rolling mill to obtain detection data; and feeding back the detection data to a primary model for deviation correction calculation, and controlling a corresponding servo valve of the hydraulic oil cylinder to correct according to the deviation correction data obtained by calculation.

One or more technical solutions in the embodiments of the present invention at least have one or more of the following technical effects:

the embodiment of the invention provides a hydraulic system and a method for controlling tension of a cold rolling single-rack simulator, wherein the system comprises: the device comprises a rolling mill, velometers, tensiometers, a hydraulic oil cylinder, a servo valve and an oil pump, wherein strip steel is rolled by the rolling mill, the rolling speed of the rolled steel is detected by the two velometers respectively arranged at the two sides of the rolling mill, and the tensiometers arranged at the two sides of the rolling mill are connected with the end part of the strip steel by the tensiometers to detect the rolling tension of the strip steel; the hydraulic oil cylinder is connected with the tensiometer and is provided with an oil inlet cavity and an oil outlet cavity, wherein the hydraulic oil cylinder comprises a first hydraulic oil cylinder and a second hydraulic oil cylinder, the first hydraulic oil cylinder is arranged on one side of the rolling mill, and the first hydraulic oil cylinder is connected with one end of the strip steel; the second hydraulic cylinder is arranged on the other side of the rolling mill and is connected with the other end of the strip steel; the servo valves are connected with the hydraulic oil cylinders and used for controlling the extension and contraction of the hydraulic oil cylinders, and the number of the servo valves is four, and the four servo valves are respectively connected with an oil inlet cavity and an oil outlet cavity of the first hydraulic oil cylinder and an oil inlet cavity and an oil outlet cavity of the second hydraulic oil cylinder; the oil pump is connected with the hydraulic cylinder, the oil pump provides power for the servo valve and the oil cylinder, the extension and contraction control of the pressure oil cylinder is realized by utilizing the flow-controlled servo valve, so that the controllability and the reversibility of the rolling tension are realized, the rolling tension of the strip steel is effectively controlled by the oil cylinder, the accurate control of the rolling tension of the strip steel is realized by controlling the tension of the hydraulic cylinder by the servo valve, the influence on the rolling reduction under various conditions of fixed front tension, fixed rear tension, fixed tension difference and the like is accurately mastered by accurately controlling the tension of the front and rear tension oil cylinders in the rolling process of the cold rolling single-stand simulator of the strip steel, the reliability and the stability of experimental data are improved, the technical effect of the scientific research capability of experimental equipment is improved, and every two servo valves control one oil cylinder to ensure that the extension speed and the load pressure of the hydraulic cylinder can be adjusted, for the same oil cylinder, the command signal of the given left servo valve can be the same as or different from the command signal of the given right servo valve, so that the combination of various pressures and speeds can be easily realized, and the tension of the single-frame simulator can be accurately controlled. Therefore, the technical problem that the reliability and stability of experimental data are influenced due to poor tension control stability of the cold rolling single-rack simulator in the prior art is effectively solved.

The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.

Drawings

FIG. 1 is a schematic structural diagram of a hydraulic system for controlling tension of a cold rolling single-stand simulator according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a main body device of a cold rolling single-rack simulator in an embodiment of the invention;

FIG. 3 is a schematic diagram of a conventional reversible single-bay configuration of the prior art;

FIG. 4 is a schematic structural diagram of an actuator of the hydraulic system according to the embodiment of the invention;

fig. 5 is a schematic flow chart of a hydraulic control method for tension of a cold rolling single-stand simulator according to an embodiment of the present invention.

Description of reference numerals: the device comprises a rolling mill 1, a velometer 2, a tensiometer 3, a hydraulic cylinder 4, a first hydraulic cylinder 41, a second hydraulic cylinder 42, a servo valve 5, a control oil pump 6, a storage loading oil pump 7 and a pilot valve 8.

Detailed Description

The embodiment of the invention provides a hydraulic system and a method for controlling tension of a cold rolling single-rack simulator, which are used for solving the technical problem that the reliability and stability of experimental data are influenced due to poor tension control stability of the cold rolling single-rack simulator in the prior art.

The technical scheme in the embodiment of the invention has the following general idea:

a rolling mill through which a strip steel is rolled; the two speed measuring devices are respectively arranged on two sides of the rolling mill and used for detecting the rolling speed of the strip steel; the tension meters are arranged on two sides of the rolling mill respectively, are connected with the end parts of the strip steel and are used for testing the rolling tension of the strip steel; the hydraulic oil cylinder is connected with the tensiometer and is provided with an oil inlet cavity and an oil outlet cavity, wherein the hydraulic oil cylinder comprises a first hydraulic oil cylinder and a second hydraulic oil cylinder, the first hydraulic oil cylinder is arranged on one side of the rolling mill, and the first hydraulic oil cylinder is connected with one end of the strip steel; the second hydraulic cylinder is arranged on the other side of the rolling mill and is connected with the other end of the strip steel; the servo valves are connected with the hydraulic oil cylinders and used for controlling the extension and contraction of the hydraulic oil cylinders, and the number of the servo valves is four, and the four servo valves are respectively connected with the oil inlet cavity and the oil outlet cavity of the first hydraulic oil cylinder and the oil inlet cavity and the oil outlet cavity of the second hydraulic oil cylinder; the oil pump, the oil pump is including saving the loading oil pump, save the loading oil pump with the servo valve is connected, does the servo valve fuel feeding. The method has the advantages that the method achieves the technical effect that the combination of various pressures and speeds is easily realized, and the tension of the single-stand simulator is accurately controlled by accurately controlling the tension of the front tension cylinder and the rear tension cylinder in the rolling process of the single-stand simulator, accurately controlling the influence on the reduction under various conditions such as fixed front tension, fixed rear tension, fixed tension difference and the like, improving the reliability and stability of experimental data, and improving the scientific research capability of experimental equipment.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.