Rolling force measuring system with overload measuring function

Abstract

The application provides a rolling force measuring system with overload measuring function, and relates to the technical field of rolling. The system comprises a rolling force sensor and a secondary instrument. The secondary instrument comprises an excitation power supply, a first calculation channel, a first signal output end, a second calculation channel and a second signal output end. The excitation power supply is electrically connected with the rolling force sensor. The signal output end of the rolling force sensor is connected with the first calculation channel and the second calculation channel respectively. The first calculation channel is used for calculating a first load force value according to pre-acquired first calibration data. The second calculation channel is used for calculating a second load force value according to pre-acquired second calibration data. The system adopts the secondary instrument with two calculation channels. The calibration data for different rolling force ranges are respectively input to the two channels. The secondary instrument can not only output the normal rolling force with high precision, but also output the overload rolling force, so that the dynamic measuring range of the rolling force measuring system is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the rolling technical field, and in particular to a rolling force measuring system with overload measuring function. BACKGROUND

[0002] In the steel plate rolling production process of the metallurgical industry, it is necessary to measure the rolling force of the steel plate online. Since the rolling force of the steel plate is large, generally 10MN-60MN, and overloading often occurs, a rolling force sensor (commonly known as a pressure head) is used to obtain the rolling force data. The pressure head has the characteristics of large rated force value and strong overload capacity. The pressure head, through a matched secondary instrument, converts the force value data into an electric signal and provides it to the steel rolling control system. The overload capacity of the pressure head is 5-7 times the rated value. The pressure head needs to be calibrated according to the rated value on a force standard machine before it can measure the force value. Generally, the secondary instrument takes the rated value of the pressure head as the maximum output signal value, which can meet the normal production of the steel rolling. However, when the rolling mill is overloaded, the secondary instrument cannot output the overloading rolling force signal. SUMMARY

[0003] The present application aims at the deficiencies of the prior art, and provides a rolling force measuring system with overload measuring function to solve the problem of measuring overloading rolling force.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0005] The present application provides a rolling force measuring system with overload measuring function, which comprises a rolling force sensor and a secondary instrument, and the secondary instrument comprises an excitation power supply, a first calculation channel, a first signal output end, a second calculation channel and a second signal output end.

[0006] The excitation power supply is electrically connected with the rolling force sensor and is used to provide power supply for the rolling force sensor.

[0007] The signal output end of the rolling force sensor is connected with the first calculation channel and the second calculation channel respectively.

[0008] The first calculation channel is used to calculate a first load force value based on the output signal from the rolling force sensor according to the first calibration data obtained in advance, and convert the first load force value into a first output signal and output the first output signal via the first signal output end. The first calibration data is calibration data obtained under the following conditions: the characteristics of the rolling force sensor from no load to a preset rated load force value range are calibrated on a force standard machine.

[0009] The second calculation channel is configured to calculate a second load force value based on the output signal from the rolling force sensor according to pre-acquired second calibration data, and convert the second load force value into a second output signal, which is output via a second signal output end, wherein the second calibration data is calibration data acquired under the condition that the rolling force sensor is calibrated on a force standard machine for its characteristics in the range from a preset rated load force value to a preset maximum overload force value.

[0010] Optionally, the first load force value ranges from 0 to the preset rated load force value, and the second load force value ranges from the preset rated load force value to the preset maximum overload force value.

[0011] Optionally, the first output signal and the second output signal are both standard instrument signals of 4-20 mA.

[0012] Optionally, the first calculation channel and the second calculation channel are further configured to amplify the output signal from the rolling force sensor.

[0013] Optionally, for the first calculation channel, the case that the first output signal is 4 mA corresponds to the rolling force sensor being idle, and the case that the first output signal is 20 mA corresponds to the preset rated load force value of the rolling force sensor; for the second calculation channel, the case that the second output signal is 4 mA corresponds to the preset rated load force value of the rolling force sensor, and the case that the second output signal is 20 mA corresponds to the preset maximum overload force value of the rolling force sensor.

[0014] The present application has the following beneficial effects:

[0015] The rolling force measuring system with overload measuring function provided by the application comprises a rolling force sensor and a secondary instrument, the secondary instrument comprising an excitation power supply, a first calculation channel, a first signal output end, a second calculation channel and a second signal output end; the excitation power supply is electrically connected with the rolling force sensor and is used to provide power supply for the rolling force sensor; the signal output end of the rolling force sensor is connected with the first calculation channel and the second calculation channel respectively; the first calculation channel is used to calculate a first load force value based on the output signal from the rolling force sensor according to the first calibration data acquired in advance, and convert the first load force value into a first output signal and output the first output signal via the first signal output end, the first calibration data being calibration data obtained under the condition that the characteristics of the rolling force sensor from no load to a preset rated load force value range are calibrated on a force standard machine; the second calculation channel is used to calculate a second load force value based on the output signal from the rolling force sensor according to the second calibration data acquired in advance, and convert the second load force value into a second output signal and output the second output signal via the second signal output end, the second calibration data being calibration data obtained under the condition that the characteristics of the rolling force sensor from the preset rated load force value to a preset maximum overload force value range are calibrated on the force standard machine. The system adopts the secondary instrument with two calculation channels, and the calibration data calibrated for different rolling force ranges are respectively input to the two calculation channels, so that the secondary instrument can not only output normal rolling force with high precision, but also output overload rolling force, and the dynamic measuring range of the rolling force measuring system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0017] Figure 1 The structural block diagram of the rolling force measuring system with overload measuring function provided by the embodiments of the present application is shown. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present application.

[0019] In the steel plate rolling production process of the metallurgical industry, the rolling force of the steel plate needs to be measured on line. Since the rolling force of the steel plate is large and overloading often occurs, a rolling force sensor (commonly known as a pressure head) is used to obtain the rolling force data. The pressure head converts the force value data into an electrical signal through a matching secondary instrument and provides the rolling force control system. The overload capacity of the pressure head is 5-7 times the rated value. The pressure head needs to be calibrated according to the rated value on a force standard machine to measure the force value. Usually, the secondary instrument takes the rated value of the pressure head as the maximum output signal value, which can meet the normal production of the steel rolling. However, when the rolling mill is overloaded, the secondary instrument cannot output the overloading rolling force signal. The present application is aimed at the problem of the rolling force measurement system in the metallurgical industry and proposes a rolling force measurement system with an overload measurement function.

[0020] Figure 1 The structure block diagram of the rolling force measurement system with an overload measurement function provided by the embodiment of the present application is shown. As shown in Figure 1 The rolling force measurement system with an overload measurement function provided by the present application includes a rolling force sensor 100 and a secondary instrument 101. The secondary instrument 101 includes an excitation power supply 102, a first calculation channel 103, a first signal output end S1, a second calculation channel 104 and a second signal output end S2.

[0021] The excitation power supply 102 is electrically connected with the rolling force sensor 100 and is used to provide power supply for the rolling force sensor 100. Specifically, the rolling force sensor 100 has four ports, specifically including a first port P1, a second port P2, a third port P3 and a fourth port P4. For example, the first port P1 can be connected with the positive electrode of the excitation power supply 102, and the second port P2 can be connected with the negative electrode of the excitation power supply 102. The third port P3 can be the signal output positive electrode of the rolling force sensor 100, and the fourth port P4 can be the signal output negative electrode of the rolling force sensor 100.

[0022] The signal output end of the rolling force sensor 100 is connected with the first calculation channel 103 and the second calculation channel 104 respectively. Specifically, as shown in Figure 1 The third port P3 is connected with the input positive electrode of the first calculation channel 103 and the second calculation channel 104 respectively, and the fourth port P4 is connected with the input negative electrode of the first calculation channel 103 and the second calculation channel 104 respectively.

[0023] The first computing channel 103 is configured to calculate a first load force value based on the output signal from the rolling force sensor 100 according to pre-obtained first calibration data, and convert the first load force value into a first output signal, which is output via the first signal output end S1. The first calibration data is calibration data obtained under the condition that the characteristics of the rolling force sensor 100 in the range from no load to a preset rated load force value are calibrated on a force standard machine. The second computing channel 104 is configured to calculate a second load force value based on the output signal from the rolling force sensor 100 according to pre-obtained second calibration data, and convert the second load force value into a second output signal, which is output via the second signal output end S2. The second calibration data is calibration data obtained under the condition that the characteristics of the rolling force sensor 100 in the range from the preset rated load force value to a preset maximum overload force value are calibrated on a force standard machine. Optionally, the range of the first load force value is from 0 to the preset rated load force value, and the range of the second load force value is from the preset rated load force value to the preset maximum overload force value.

[0024] Optionally, the first computing channel 103 and the second computing channel 104 are further configured to amplify the output signal from the rolling force sensor 100. Optionally, the types of the first output signal and the second output signal are both standard instrument signals of 4-20 mA. Specifically, for the first computing channel 103, the case that the first output signal is 4 mA corresponds to the rolling force sensor 100 being no load (i.e., the load force value is 0), and the case that the first output signal is 20 mA corresponds to the preset rated load force value of the rolling force sensor 100; for the second computing channel 104, the case that the second output signal is 4 mA corresponds to the preset rated load force value of the rolling force sensor, and the case that the second output signal is 20 mA corresponds to the preset maximum overload force value of the rolling force sensor.

[0025] In practical application, the rolling force sensor (pressure head) has high detection precision in the rated force value range, and is linear output. When the rated value is more than 1 times, the pressure head will not be damaged, but due to the existence of hysteresis elastic effect, the output characteristic cannot remain linear, and the output proportion becomes smaller after overload. In order to make the rolling force measurement system not only maintain high detection precision in the rated range, but also output the force value signal in the overload state, the pressure head is calibrated twice on the force standard machine. The first calibration is the conventional calibration method, the characteristic of the pressure head from the empty load to the rated load is calibrated, and the calibration data is input into the first calculation channel of the secondary instrument, and is converted into the standard instrument signal output of 4-20mA; the second calibration is the overload calibration method, the pressure head is loaded from the rated load, and the loading force is increased point by point until the maximum overload force value, and the output data of each point of the pressure head is recorded. Since the characteristic of the pressure head is poor at this time, the data is nonlinear, and the data is input into the second calculation channel of the secondary instrument, and is converted into the standard instrument signal output of 4-20mA after linear correction calculation. The output signal of the rolling force sensor enters the first calculation channel and the second calculation channel of the secondary instrument at the same time, and the output signal of the sensor is amplified by the two channels. Considering that the output signal amplitude of the sensor in overload is much larger than the rated output signal, in order to convert the signals of different amplitudes into the standard instrument signal output of 4-20mA, the signal amplification multiples of the first calculation channel and the second calculation channel are different, and the amplification multiples are determined according to the calibration data of the sensor. The output end of the first calculation channel outputs the force value signal of the rolling force sensor in the rated load range, and 4mA corresponds to the empty load of the sensor and 20mA corresponds to the rated load force value of the sensor. This channel outputs a high-precision measurement signal. The output end of the second calculation channel outputs the signal of the rolling force sensor from the rated load to the maximum overload force value, and 4mA corresponds to the rated load force value of the sensor and 20mA corresponds to the maximum overload load force value of the sensor. This channel outputs a corrected measurement signal.

[0026] In summary, the secondary instrument with two calculation channels is adopted in the system, the calibration data calibrated for different rolling force ranges is input into the two calculation channels, the secondary instrument can not only output the normal rolling force with high precision, but also output the overload rolling force, and the dynamic measurement range of the rolling force measurement system is improved.

[0027] The above embodiments only illustrate the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A rolling force measurement system with overload measurement function, characterized in that, The system comprises a rolling force sensor and a secondary instrument, the secondary instrument comprising an excitation power supply, a first calculation channel, a first signal output, a second calculation channel and a second signal output; The excitation power supply is electrically connected with the rolling force sensor, for providing power supply for the rolling force sensor; The signal output of the rolling force sensor is connected with the first calculation channel and the second calculation channel respectively; The first calculation channel is used for calculating a first load force value based on the output signal from the rolling force sensor according to pre-acquired first calibration data, and converting the first load force value into a first output signal, which is output via the first signal output, the first calibration data being calibration data obtained under the condition that the characteristics of the rolling force sensor from no load to a preset rated load force value range are calibrated on a force standard machine; The second calculation channel is used for calculating a second load force value based on the output signal from the rolling force sensor according to pre-acquired second calibration data, and converting the second load force value into a second output signal, which is output via the second signal output, the second calibration data being calibration data obtained under the condition that the characteristics of the rolling force sensor from the preset rated load force value to a preset maximum overload force value range are calibrated on the force standard machine.

2. The rolling force measuring system having an overload measuring function according to claim 1, characterized by, The range of the first load force value is 0 to the preset rated load force value, and the range of the second load force value is the preset rated load force value to the preset maximum overload force value.

3. The rolling force measuring system having an overload measuring function according to claim 1, characterized by, The types of the first output signal and the second output signal are both standard instrument signals of 4-20 mA.

4. The rolling force measurement system having an overload measurement function according to claim 3, characterized by, The first calculation channel and the second calculation channel are also used for amplifying the output signal from the rolling force sensor.

5. The rolling force measurement system having an overload measurement function according to claim 3, characterized by, For the first calculation channel, the case that the first output signal is 4 mA corresponds to no load of the rolling force sensor, and the case that the first output signal is 20 mA corresponds to the preset rated load force value of the rolling force sensor; for the second calculation channel, the case that the second output signal is 4 mA corresponds to the preset rated load force value of the rolling force sensor, and the case that the second output signal is 20 mA corresponds to the preset maximum overload force value of the rolling force sensor.

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