阅读说明：本技术 一种轧机控制方法以及系统 (Rolling mill control method and system ) 是由 赵志诚 高丽娟 胡啸 金坤善 孙前来 王健安 王银 于 2021-07-16 设计创作，主要内容包括：本申请公开了一种轧机控制方法以及系统,用于对轧机孔型进行控制,用于提高轧辊位置的准确性,以提升产品生产质量。本申请方法包括：控制器通过压力传感器确定压力跌落平均值；控制器根据压力跌落平均值确定压力调节量；控制器通过位移传感器确定轧辊位置的超调量平均值；控制器根据超调量平均值确定辊缝调节量；控制器根据压力调节量通过伺服调速机调节定量泵的转速,以调节轧辊的压力的输出压力,并根据辊缝调节量调节轧辊的位置。(The application discloses a rolling mill control method and system, which are used for controlling a pass of a rolling mill and improving the accuracy of a roller position so as to improve the production quality of a product. The method comprises the following steps: the controller determines the average value of the pressure drop through the pressure sensor; the controller determines the pressure regulating quantity according to the pressure drop average value; the controller determines the overshoot average value of the roller position through the displacement sensor; the controller determines the roll gap adjustment amount according to the overshoot average value; the controller adjusts the rotating speed of the constant delivery pump through the servo speed regulator according to the pressure adjusting quantity so as to adjust the pressure output pressure of the roller and adjust the position of the roller according to the roller gap adjusting quantity.)

1. A rolling mill control method, characterized in that it is applied in a rolling mill control system comprising, coupled to each other: the device comprises a controller, a constant delivery pump, a servo speed regulator, a pressure sensor and a displacement sensor; the method comprises the following steps:

the controller determines a pressure drop average value through the pressure sensor;

the controller determines a pressure regulating quantity according to the pressure drop average value;

the controller determines the overshoot average value of the roller position through the displacement sensor;

the controller determines the roll gap adjustment amount according to the overshoot average value;

the controller adjusts the rotating speed of the constant delivery pump through the servo speed regulator according to the pressure adjusting quantity so as to adjust the pressure output pressure of the roller and adjust the position of the roller according to the roller gap adjusting quantity.

2. The rolling mill control method according to claim 1, wherein the pressure of the roll is supplied by a fixed displacement pump to which a servo motor is connected, and the controller adjusts the rotation speed of the fixed displacement pump by the servo governor according to the pressure adjustment amount includes:

the controller determines the rotating speed regulating quantity of the servo speed regulator according to the pressure regulating quantity;

and the controller adjusts the rotating speed of the servo motor according to the rotating speed adjusting quantity so as to adjust the output pressure of the fixed displacement pump.

3. The rolling mill control method of claim 2 wherein the rolling mill control system further comprises an encoder coupled to the servo motor, the encoder configured to measure rotational data of the servo motor and send the rotational data to the controller.

4. The mill control method of claim 1 wherein the controller determining a pressure adjustment from the pressure drop average comprises:

and the controller determines the pressure regulating quantity by calculating the product of the pressure drop value and the pressure fluctuation coefficient, wherein the fluctuation coefficient is the fluctuation coefficient of the pressure when the roller bites the steel.

5. The mill control method of claim 1 wherein the controller determining a pressure drop average via the pressure sensor comprises:

the controller determines the average value of pressure drop according to the average value of the pressure drop generated by rolling the steel with the same specification by the roller before the rolling, and the average value of the pressure drop is acquired by the controller through the pressure sensor.

6. The mill control method according to any one of claims 1 to 5, wherein the controller determining the overshoot average of the roll position by the displacement sensor includes:

the controller determines the average value of the overshoot according to the average value of the roll gap overshoot values generated by rolling the steel with the same specification by the roller before the current rolling, and the average value of the roll gap overshoot is acquired by the controller through the displacement sensor.

7. The mill control method of any one of claims 1 to 5, wherein the controller determining a roll gap adjustment from the overshoot average comprises:

and the controller determines the roll gap adjustment amount according to the roll gap fluctuation coefficient and the wall thickness over-tolerance of the steel pipe at the roll inlet.

8. A mill control system, characterized in that the system comprises:

controller, constant delivery pump, servo governor, pressure sensor and displacement sensor, servo governor with the constant delivery pump is connected, servo governor is used for adjusting the rotational speed of constant delivery pump, in order to adjust the output pressure of constant delivery pump, pressure sensor is used for gathering the pressure data of roll, and transmit to the controller, displacement sensor is used for gathering the position data of roll and transmitting extremely the controller, the controller is used for the basis pressure data passes through servo governor adjusts the rotational speed of constant delivery pump, in order to adjust the output pressure of constant delivery pump, and pass through position data adjusts the position of roll.

9. The mill control system of claim 8, wherein the system further comprises: the first flow detection device is arranged at the outlet of the fixed displacement pump and used for detecting the flow of the outlet of the fixed displacement pump.

10. The mill control system of claim 8, wherein the system further comprises: the second flow detection device is installed at an inlet of the servo cylinder and used for detecting the flow of the inlet of the servo cylinder, the servo cylinder is connected with the fixed displacement pump, the fixed displacement pump provides hydraulic pressure for the servo cylinder, and the servo cylinder is used for driving the roller to move through the hydraulic pressure.

Technical Field

The application relates to the technical field of automatic control, in particular to a rolling mill control method and system.

Background

The continuous tube rolling mill generally comprises 5-6 frames which work together, and each frame is provided with 2 or 3 rollers to form a closed hole pattern to participate in the rolling of the hollow billets. The rolls are subjected to a maximum rolling force of 3000KN during the rolling process, and the rolls are subjected to a variation of the rolling force from 30 to 3000KN during the rolling process with a minimum positional deviation.

In the scheme provided by the prior art, the position control of the roller is driven by a hydraulic servo cylinder, and the hydraulic servo cylinder is controlled by a high-performance hydraulic servo valve and a high-dynamic response servo controller; an energy accumulator is arranged near the servo valve, and a system oil source is guaranteed by a constant-pressure variable pump. In the actual rolling process, as the tube rolling is interrupted rolling, the hole patterns can generate large position deviation in the steel biting and steel throwing processes, and the position deviation can cause certain influence on the quality of products.

Disclosure of Invention

In order to solve the technical problem, the first aspect of the present application provides a rolling mill control method and system.

A first aspect of the present application provides a rolling mill control method, the method comprising:

the controller determines a pressure drop average value through the pressure sensor;

the controller determines a pressure regulating quantity according to the pressure drop average value;

the controller determines the overshoot average value of the roller position through the displacement sensor;

the controller determines the roll gap adjustment amount according to the overshoot average value;

the controller adjusts the rotating speed of the constant delivery pump through the servo speed regulator according to the pressure adjusting quantity so as to adjust the pressure output pressure of the roller and adjust the position of the roller according to the roller gap adjusting quantity.

Optionally, the pressure of the roller is provided by a fixed displacement pump, the fixed displacement pump is connected with a servo motor, and the controller adjusts the rotation speed of the fixed displacement pump according to the pressure adjustment amount by the servo governor, and the control method includes:

the controller determines the rotating speed regulating quantity of the servo speed regulator according to the pressure regulating quantity;

and the controller adjusts the rotating speed of the servo motor according to the rotating speed adjusting quantity so as to adjust the output pressure of the fixed displacement pump.

Optionally, the rolling mill control system further includes an encoder, the encoder is connected to the servo motor, and the encoder is configured to measure rotation data of the servo motor and send the rotation data to the controller.

Optionally, the determining, by the controller, the pressure adjustment amount according to the pressure drop average value includes:

the controller determines the pressure regulating quantity by calculating the product of the pressure drop value and the pressure fluctuation coefficient, wherein the fluctuation coefficient is the fluctuation coefficient of the pressure when the roller bites the steel;

optionally, the determining, by the controller, the pressure drop average value by the pressure sensor includes:

the controller determines the average value of pressure drop according to the average value of the pressure drop generated by rolling the steel with the same specification by the roller before the rolling, and the average value of the pressure drop is acquired by the controller through the pressure sensor.

Optionally, the determining, by the controller, the average value of the overshoot amounts of the roll positions through the displacement sensor includes:

the controller determines the average value of the overshoot according to the average value of the roll gap overshoot values generated by rolling the steel with the same specification by the roller before the current rolling, and the average value of the roll gap overshoot is acquired by the controller through the displacement sensor.

Optionally, the determining, by the controller, the roll gap adjustment amount according to the overshoot average value includes:

and the controller determines the roll gap adjustment amount according to the roll gap fluctuation coefficient and the wall thickness over-tolerance of the steel pipe at the roll inlet.

Optionally, the rolling mill control system further includes: the first flow detection device is arranged at the outlet of the fixed displacement pump and used for detecting the flow of the outlet of the fixed displacement pump.

Optionally, the rolling mill control system further includes: the second flow detection device is installed at an inlet of the servo cylinder, and is used for detecting the flow of the inlet of the servo cylinder, the servo cylinder is connected with the fixed displacement pump, the fixed displacement pump provides hydraulic pressure for the servo cylinder, and the servo cylinder is used for driving the roller to move through the hydraulic pressure.

Optionally, the rolling mill control system further includes: the third flow detection device is arranged at an outlet of a servo valve, the third flow detection device is used for detecting the flow of the outlet of the servo valve, the servo valve is used for controlling the flow of a servo cylinder, and the servo cylinder is used for driving the roller to move through hydraulic pressure.

A second aspect of the present application provides a mill control system, the system comprising:

controller, constant delivery pump, servo governor, pressure sensor and displacement sensor, servo governor with the constant delivery pump is connected, servo governor is used for adjusting the rotational speed of constant delivery pump, in order to adjust the output pressure of constant delivery pump, pressure sensor is used for gathering the pressure data of roll, and transmit to the controller, displacement sensor is used for gathering the position data of roll and transmitting extremely the controller, the controller is used for the basis pressure data passes through servo governor adjusts the rotational speed of constant delivery pump, in order to adjust the output pressure of constant delivery pump, and pass through position data adjusts the position of roll.

Optionally, the system further includes: the first flow detection device is arranged at the outlet of the fixed displacement pump and used for detecting the flow of the outlet of the fixed displacement pump.

Optionally, the system further includes: the second flow detection device is installed at an inlet of the servo cylinder and used for detecting the flow of the inlet of the servo cylinder, the servo cylinder is connected with the fixed displacement pump, the fixed displacement pump provides hydraulic pressure for the servo cylinder, and the servo cylinder is used for driving the roller to move through the hydraulic pressure.

According to the technical scheme, the method has the following advantages:

in the rolling mill control method provided by the application, the mean overshoot value is determined according to the mean value of the pressure drop; and the roll gap regulating quantity is determined according to the average value of the overshoot quantity of the position of the roll, the pressure of the roll is finally regulated according to the pressure regulating quantity, the position of the roll is regulated according to the roll gap regulating quantity, and when steel impacts the roll, the pressure and the position of the roll can be accurately regulated, so that the accuracy of the pressure and the position is improved, and the product quality is improved.

Drawings

In order to more clearly illustrate the technical solutions in the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic flow chart diagram illustrating one embodiment of a rolling mill control method provided herein;

fig. 2 is a schematic structural diagram of an embodiment of a rolling mill control system provided by the present application.

Detailed Description

The continuous tube rolling mill generally comprises 5-6 frames which work together, and each frame is provided with 2 or 3 rollers to form a closed hole pattern to participate in the rolling of the hollow billets. The rolls are subjected to a maximum rolling force of 3000KN during the rolling process, and the rolls are subjected to a variation of the rolling force from 30 to 3000KN during the rolling process with a minimum positional deviation.

In the scheme provided by the prior art, the position control of the roller is driven by a hydraulic servo cylinder, and the hydraulic servo cylinder is controlled by a high-performance hydraulic servo valve and a high-dynamic response servo controller; an energy accumulator is arranged near the servo valve, and a system oil source is guaranteed by a constant-pressure variable pump. In the actual rolling process, as the tube rolling is interrupted rolling, the hole patterns can generate large position deviation in the steel biting and steel throwing processes, and the position deviation can cause certain influence on the quality of products.

Based on the above, the application provides a rolling mill control method and system, which are used for controlling the pass of the rolling mill and improving the accuracy of the position of the roller so as to improve the production quality of products.

Referring to fig. 1, fig. 1 is a schematic flow chart of an embodiment of a rolling mill control method provided in the present application, which can be applied to a rolling mill control system, where the rolling mill control system includes: the device comprises a controller, a constant delivery pump, a servo speed regulator, a pressure sensor and a displacement sensor; the rolling mill control method comprises the following steps:

101. the controller determines the average value of the pressure drop through the pressure sensor;

the average value of the pressure drop can be determined by the average value of the pressure drop generated by rolling the steel with the same specification by the roller before the rolling, and the average value of the pressure drop of the roller can be determined by the pressure data collected by the displacement sensor.

102. The controller determines the pressure regulating quantity according to the pressure drop average value;

the average value of the pressure drop may be determined by calculating a product of the pressure drop value and a pressure fluctuation coefficient, which is a fluctuation coefficient of the pressure when the roll bites the steel material, and is calculated by, for example, the following formula:

△Px＝△Pxj×S1

where Δ px represents the pressure adjustment amount, Δ Pxj represents the average value of the gauge pressure drop, which can be downloaded from the rolling database, and S1 represents the fluctuation coefficient of the pressure at the time of steel biting.

103. The controller determines the overshoot average value of the roller position through the displacement sensor;

the average value of the overshoot of the roller position can be determined by the average value of the roll gap overshoot values generated by rolling the same specification steel before the current rolling, and the average value of the roll gap overshoot values can be determined by the position data acquired by the displacement sensor.

104. The controller determines the roll gap adjustment amount according to the overshoot average value;

the roll gap adjustment amount can be determined according to the roll gap fluctuation coefficient and the wall thickness over-tolerance of the steel pipe at the roll inlet, and is calculated by the following formula:

△S＝△h0×S2+△h1×(G/K)

wherein, DeltaS represents the roll gap adjustment amount, Deltah 0 represents the average value of the overshoot of the roll position when the roll bites steel in the rolling of the specification, which can be downloaded from a rolling database, S2 represents the fluctuation coefficient of the roll gap when the roll bites steel, Deltah 1 represents the wall thickness overshoot of the inlet steel tube, G is the plastic rigidity coefficient of the strip steel, and K is the rigidity coefficient of the rolling mill.

105. The controller adjusts the rotating speed of the constant delivery pump through the servo speed regulator according to the pressure adjusting quantity so as to adjust the pressure output pressure of the roller and adjust the position of the roller according to the roller gap adjusting quantity.

After confirming pressure adjustment volume and roll gap overshoot, adjust the pressure and the position of roll, and the pressure of adjusting the roll gap can have multiple mode, in this application, the pressure of roll can have the constant delivery pump to provide, and the constant delivery pump is connected with servo governor, and the pressure of roll can be adjusted to the rotational speed of adjusting the constant delivery pump through servo governor. Therefore, at the time of adjustment, the pressure adjustment amount can be converted into the rotation speed of the servo governor, and the servo governor can be adjusted.

The above embodiments describe the rolling mill control method provided in the present application in detail, and the rolling mill control system provided in the present application is described in detail below with reference to the accompanying drawings.

Referring to fig. 2, fig. 2 is a schematic structural diagram of an embodiment of a rolling mill control system provided in the present application, the system including:

controller 1, constant delivery pump 2, servo speed governor 3, pressure sensor 4 and displacement sensor, servo speed governor 3 is connected with constant delivery pump 2, servo speed governor 3 is used for adjusting the rotational speed of constant delivery pump 2, in order to adjust the output pressure of constant delivery pump 2, pressure sensor 4 is used for gathering the pressure data of roll, and transmit to controller 1, displacement sensor is used for gathering the position data of roll and transmits to controller 1, controller 1 is used for adjusting the rotational speed of servo speed governor 3 according to pressure data, in order to adjust the output pressure of constant delivery pump 2, and adjust the position of roll through position data.

In this application, the rotational speed of adjusting constant delivery pump 2 and then the output pressure who adjusts constant delivery pump 2 through servo governor 3, can carry out accurate control to the output pressure of constant delivery pump 2, and pressure sensor 4 can gather the pressure data of roll and send for controller 1, controller 1 is through the position data of displacement sensor roll, and then controller 1 adjusts the rotational speed of constant delivery pump 2 through servo governor 3 according to pressure data and position data, promote the accurate nature of roll position and pressure, reduce because the impact of steel is to the influence of roll position and pressure.

Optionally, the system further comprises: and the first flow detection device 6 is arranged at the outlet of the fixed displacement pump 2, and the first flow detection device 6 is used for detecting the flow of the outlet of the fixed displacement pump 2.

Optionally, the system further comprises: and the second flow detection device 7 is arranged at the inlet of the servo cylinder, the second detection device 7 is used for detecting the flow of the inlet of the servo cylinder, the servo cylinder is connected with the fixed displacement pump 2, the fixed displacement pump 2 supplies hydraulic pressure to the servo cylinder, and the servo cylinder is used for driving the roller to move through the hydraulic pressure.

Optionally, the system further comprises: and the third flow detection device 8 is arranged at the outlet of the servo valve, the third flow detection device 8 is used for detecting the flow of the outlet of the servo valve, the servo valve is used for controlling the flow of a servo cylinder, and the servo cylinder is used for driving the roller to move through hydraulic pressure.

In this embodiment, can carry out intelligent, digital monitoring to the flow in the pipeline through installation flow detection device, when the flow appears unusually, can indicate the staff to maintain, if the outside pipeline does not appear unusually, then probably the jar appears unusually.

Optionally, the method further includes: servo motor 9, servo motor 9 are connected with servo governor and constant delivery pump 2 respectively, and servo motor 9 is used for driving constant delivery pump 2, and servo governor 3 is used for adjusting the rotational speed of constant delivery pump 2 through adjusting servo motor's rotational speed.

In this embodiment, the output pressure is adjusted by adjusting the rotation speed of the servo motor 9 by the servo governor 3 and further adjusting the rotation speed of the fixed displacement pump 2.

Optionally, the method further includes: and the encoder 10 is connected with the servo motor 9, and the encoder 10 is used for measuring the rotation data of the servo motor 9 and sending the rotation data to the controller 1.

Optionally, the system further comprises: and the pilot-operated overflow valve 11 is connected with the fixed displacement pump 2.

Optionally, the system further comprises: and the stop valve 12 is arranged on a pipeline for communicating the servo valve with the fixed displacement pump 2, and the stop valve 12 is arranged on the pipeline.

Optionally, the method further includes: and the energy accumulator 13 is arranged on a pipeline between the servo valve and the fixed displacement pump 2, and the energy accumulator 13 is arranged on the pipeline between the servo valve and the fixed displacement pump 2.

Optionally, the method further includes: and the single piston rod cylinder 14, wherein the single piston rod cylinder 14 is connected with the fixed displacement pump 2.

In the rolling mill control system that this application provided, controller 1 gathers the pressure data of roll through pressure sensor 4, and adjust the rotational speed of constant delivery pump 2 through servo governor 3, with the output pressure of adjusting constant delivery pump 2, gather the position data of roll according to displacement sensor, and adjust the position of roll according to the position data, when steel produced the impact to the roll, can carry out the accurate regulation to roll pressure and position, and then promote the accuracy of pressure and position, improve product quality.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and the like.