Method for reducing fault influence of displacement sensor of rolling mill screw-down system

Abstract

The invention discloses a method for reducing the fault influence of a displacement sensor of a rolling mill screw-down system, which relates to the technical field of rolling mills and comprises the following steps: reading a first rolling mill screw-down value measured by the displacement sensor in each sampling period; calculating a second rolling mill screw-down value in the corresponding sampling period based on a screw-down motor encoder; whether the displacement sensor operates normally or not is judged, and if yes, the first rolling mill screw-down value serves as a screw-down actual value of a screw-down control system; and if not, the second rolling mill screw-down value is adopted as the actual screw-down value of the screw-down control system. The influence of the fault of the electric lower system displacement sensor of the rolling mill can be reduced. If the displacement sensor is damaged, the current pass can be smoothly completed; if the displacement sensor has a fault and only numerical jump occurs, the fault can be completely avoided.

Description

Technical Field

[0001] The invention relates to the technical field of rolling mills, and in particular to a method for reducing the influence of failure of a displacement sensor of a rolling mill depression system. Background Art

[0002] The electric pressing system is an important device for adjusting the roll gap of the rolling mill. The pressing position detection of the rolling mill at home and abroad is detected by displacement sensors. When the displacement sensor fails or the value changes suddenly, the actual position of the electric pressing will be judged as invalid. In order to ensure the safety of equipment and personnel, the rolling will be terminated immediately, causing the rolled steel plate to become scrap and the fault handling time is long. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a method for reducing the influence of the failure of the displacement sensor of the rolling mill press system.

[0004] In order to solve the above technical problems, the technical solution of the present invention is as follows: A method for reducing the impact of a displacement sensor failure in a rolling mill press system, comprising: Reading the first rolling mill depression value measured by the displacement sensor in each sampling period; Calculate the second rolling mill pressing value within the corresponding sampling period based on the pressing motor encoder; Determine whether the displacement sensor is operating normally. If so, use the first rolling mill's depression value as the actual depression value of the depression control system; if not, use the second rolling mill's depression value as the actual depression value of the depression control system.

[0005] As a preferred solution of the method for reducing the influence of the failure of the displacement sensor of the rolling mill depression system of the present invention, wherein: after the if not, then using the second rolling mill depression value as the depression actual value of the depression control system, it also includes: Send out an alarm signal.

[0006] As a preferred solution of the method for reducing the impact of failure of a displacement sensor in a rolling mill press-down system described in the present invention, the alarm signal includes an audible and visual alarm signal.

[0007] As a preferred solution of the method for reducing the influence of the failure of the displacement sensor of the rolling mill depression system according to the present invention, wherein: the reading of the first rolling mill depression value measured by the displacement sensor comprises: Read the first rolling mill depression value measured by the displacement sensor in each sampling period.

[0008] As a preferred solution of the method for reducing the influence of the failure of the displacement sensor of the rolling mill pressing system according to the present invention, the calculation of the second rolling mill pressing value based on the pressing motor encoder includes: The second rolling mill depression value in each corresponding sampling period is calculated based on the depression motor encoder.

[0009] The beneficial effects of the present invention are: The present invention can reduce the influence of the displacement sensor failure of the electric lowering system of the rolling mill. If the displacement sensor is damaged, the current pass can be ensured to be completed smoothly; if the displacement sensor failure only causes a value jump, the occurrence of the failure can be completely avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0011] Figure 1 A schematic flow chart of a method for reducing the impact of a displacement sensor failure in a rolling mill press system provided by the present invention. DETAILED DESCRIPTION

[0012] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific implementation modes and in combination with the accompanying drawings.

[0013] Figure 1 A flow chart of a method for reducing the impact of a displacement sensor failure in a rolling mill press system provided in an embodiment of the present application. The method specifically comprises the following steps: First, after each sampling period starts, the first rolling mill depression value measured by the displacement sensor in the sampling period, that is, S0, is read.

[0014] Afterwards, the second rolling mill depression value, ie, S1, within the corresponding sampling period is calculated based on the depression motor encoder.

[0015] Specifically, the rotation of the motor of the electric pressing system of the rolling mill drives the pressing screw to adjust the position. Therefore, the change of the pressing position can also be measured by using the encoder on the motor. The pressing motors all use speed closed-loop control and are equipped with encoders, so there is no need to add any other hardware.

[0016] Finally, determine whether the displacement sensor is operating normally. If so, use the first rolling mill's depression value as the actual depression value of the depression control system; if not, use the second rolling mill's depression value as the actual depression value of the depression control system.

[0017] Specifically, if the displacement sensor is not faulty, the actual position of the press-down control system uses the position S0 measured by the displacement sensor, and in each sampling cycle, the press-down position measured by the encoder is set to the position S0 measured by the displacement sensor; if the displacement sensor fails, the actual position of the press-down control system uses the position S1 measured by the encoder instead of the erroneous position S0 measured by the displacement sensor, and a corresponding alarm message is issued. If the displacement sensor fails only for a short period of time, it will not affect the control accuracy of the rolling mill's press-down position, thus avoiding the occurrence of failures.

[0018] It should be noted that the above alarm information includes sound and light alarm signals.

[0019] If the unplanned rolling is reduced by 6 steel plates per year, each steel plate is 35 tons on average, 210 tons of unplanned rolling can be reduced each year. The equipment failure time is reduced by 9 hours on average each year, and the equipment loss is reduced by an average of 200,000 yuan per year. The output is 200 tons per hour, and the profit per ton of steel is 500 yuan: 210*500+9*200*500+200000=1.205 million yuan; so the predicted total annual benefit is expected to be 1.205 million yuan.

[0020] Therefore, the technical solution of the present application can reduce the impact of the displacement sensor failure of the rolling mill electric lower system. If the displacement sensor is damaged, the current pass can be completed smoothly; if the displacement sensor failure only causes a value jump, the occurrence of the failure can be completely avoided.

[0021] In addition to the above embodiments, the present invention may also have other implementation modes; any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope required by the present invention.

Claims

1. A method for reducing the impact of a displacement sensor failure in a rolling mill press system, characterized in that: include: Reading the first rolling mill depression value measured by the displacement sensor; Calculate the second rolling mill's pressing value based on the pressing motor encoder; Determine whether the displacement sensor is operating normally. If so, use the first rolling mill's depression value as the actual depression value of the depression control system; if not, use the second rolling mill's depression value as the actual depression value of the depression control system.

2. The method for reducing the impact of a displacement sensor failure in a rolling mill press system according to claim 1, characterized in that: After the step of "if not, then using the second rolling mill's pressing value as the actual pressing value of the pressing control system", the method further includes: Send out an alarm signal.

3. The method for reducing the impact of a displacement sensor failure in a rolling mill press system according to claim 2, characterized in that: The alarm signal includes an audible and visual alarm signal.

4. The method for reducing the impact of a displacement sensor failure in a rolling mill press system according to claim 1, characterized in that: The first rolling mill depression value measured by the displacement sensor is read as follows: Read the first rolling mill depression value measured by the displacement sensor in each sampling period.

5. The method for reducing the influence of the failure of the displacement sensor of the rolling mill press system according to claim 4 is characterized in that: The calculation of the second rolling mill pressing value based on the pressing motor encoder comprises: The second rolling mill depression value in each corresponding sampling period is calculated based on the depression motor encoder.

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