Analog replacement method for hot coil box position sensor

Abstract

The present application belongs to the field of automatic control of metallurgical industry, and relates to a simulation substitution method of a hot coil box position sensor. The technical scheme comprises: obtaining a current value of the servo valve, and calculating an opening degree of a valve core of the servo valve through the current value to compare with a real opening degree of the valve core. When a difference between the valve core calculated opening degree and the valve core real opening degree is less than a proportional threshold value, a parameter value is used to calculate a position of the insertion arm. When the difference between the valve core calculated opening degree and the valve core real opening degree is greater than the proportional threshold value, an average value is used to calculate the position of the insertion arm.

Description

Technical Field

[0001] This invention belongs to the field of automatic control in the metallurgical industry, and relates to a method for simulating a position sensor for a hot roll box. Background Technology

[0002] With the increasing maturity of hot strip mill processes, the goals of energy conservation, cost reduction, and efficiency improvement have been met, enhancing the group's competitiveness. In hot strip mill production, reducing rolling failure rates, extending equipment lifespan, and minimizing spare parts costs have become key aspects of current line equipment management. The hot coil box position sensor is located at the end of the uncoiling unit, in a harsh environment (high temperature, moisture, iron purlins, etc.). During uncoiling, it remains in close contact with the steel coil, with zero physical contact between the equipment and the coil. After uncoiling, the cooling water is turned on, resulting in alternating hot and cold temperatures. The insertion arm sensor remains in a high-temperature, humid environment, and the equipment involves large and complex movements with crisscrossing cable connections, making it highly susceptible to damage. Therefore, a soft-detection control technology for the hot coil box insertion arm position has been developed to replace the physical sensor. Summary of the Invention

[0003] To overcome the deficiencies in the aforementioned related technologies, the present invention provides an analog alternative method for hot roll box position sensors.

[0004] The present invention provides an analog alternative method for a hot roll box position sensor, wherein the unwinding arm and the insertion arm of the hot roll box are connected, the insertion arm is driven to rotate by a hydraulic cylinder, and the hydraulic cylinder is powered by a servo valve.

[0005] Analog alternatives for hot roll box position sensors include:

[0006] The current value of the servo valve is obtained, and the valve core opening degree is calculated based on the current value. This calculated degree is then compared with the actual valve core opening degree of the servo valve.

[0007] When the difference between the calculated opening degree of the valve core and the actual opening degree of the valve core is less than the proportional threshold, the position of the insertion arm is calculated using the parameter value.

[0008] When the difference between the calculated opening degree of the valve core and the actual opening degree of the valve core is greater than the proportional threshold, the position of the insertion arm is calculated using the average value.

[0009] The ratio of the difference between the calculated opening degree and the actual opening degree of the valve core to the maximum opening degree of the valve core is given in the following table:

[0010] Difference between current input and valve core feedback (%) 1 2 3 4 5 6 7 Parameter (β) 1.276 1.318 1.4286 1.6276 / / / Parameter (λ) 1 1 1 1 / / /

[0011] The parameter values ​​include each parameter (β) and each parameter (λ) corresponding to the ratio of the difference between the calculated opening degree of the valve core and the actual opening degree of the valve core to the maximum opening degree of the valve core;

[0012] The average values ​​include the mean values ​​of each parameter (β) and each parameter (λ) corresponding to the ratio of the difference between the calculated opening degree of the valve core and the actual opening degree of the valve core to the maximum opening degree of the valve core.

[0013] The method for calculating the insertion arm using the parameter values ​​includes: a method for calculating the position of the insertion arm when it is raised;

[0014] The method for calculating the position of the insertion arm when it is raised is as follows:

[0015] P2 = KSVR×β×α1+P1

[0016] P2 = KSVR×β×α2+P1

[0017] KSVR: A coefficient is given for the action of the insertion arm servo valve;

[0018] β: The proportional control coefficient for lifting the insertion arm;

[0019] α1: The broken-line compensation coefficient for insert arm pressure control, α1=0.00499;

[0020] α2: The broken line compensation coefficient for insert arm position control, α2=0.00608;

[0021] P1: The pre-scanning cycle before inserting the arm is used to calculate the position and limit value (5-620).

[0022] P2: The scan cycle after inserting the arm is used to calculate the position and the amplitude limit (5-620).

[0023] The method for calculating the insertion arm using the parameter values ​​includes: a method for calculating the position of the insertion arm when it falls;

[0024] The method for calculating the position of the insertion arm when it falls is as follows:

[0025] P2=KSVR×λ×α1+P1

[0026] P2 = KSVR × λ × α2 + P1

[0027] KSVR: A coefficient is given for the action of the insertion arm servo valve;

[0028] λ: The proportional control coefficient for the insertion arm's drop;

[0029] α1: The broken-line compensation coefficient for insert arm pressure control, α1=0.00499;

[0030] α2: The broken line compensation coefficient for insert arm position control, α2=0.00608;

[0031] P1: The pre-scanning cycle before inserting the arm is used to calculate the position and limit value (5-620).

[0032] P2: The scan cycle after inserting the arm is used to calculate the position and the amplitude limit (5-620).

[0033] The method for calculating the insertion arm using the parameter values ​​includes: a method for calculating the position of the insertion arm when it is raised;

[0034] The method for calculating the position of the insertion arm when it is raised is as follows:

[0035] P2 = KSVR×β'×α1+P1

[0036] P2 = KSVR×β'×α2+P1

[0037] KSVR: A coefficient is given for the action of the insertion arm servo valve;

[0038] β': The mean value of the proportional control coefficient for the lifting of the insertion arm;

[0039] α1: The broken-line compensation coefficient for insert arm pressure control, α1=0.00499;

[0040] α2: The broken line compensation coefficient for insert arm position control, α2=0.00608;

[0041] P1: The pre-scanning cycle before inserting the arm is used to calculate the position and limit value (5-620).

[0042] P2: The scan cycle after inserting the arm is used to calculate the position and the amplitude limit (5-620).

[0043] The mean value of the proportional coefficient for the lifting control of the insertion arm is the average value of each parameter (β).

[0044] The method for calculating the insertion arm using the parameter values ​​includes: a method for calculating the position of the insertion arm when it falls;

[0045] The method for calculating the position of the insertion arm when it falls is as follows:

[0046] P2=KSVR×λ'×α1+P1

[0047] P2=KSVR×λ'×α2+P1

[0048] KSVR: A coefficient is given for the action of the insertion arm servo valve;

[0049] λ': The mean value of the control coefficient for the insertion arm dropping;

[0050] α1: The broken-line compensation coefficient for insert arm pressure control, α1=0.00499;

[0051] α2: The broken line compensation coefficient for insert arm position control, α2=0.00608;

[0052] P1: The pre-scanning cycle before inserting the arm is used to calculate the position and limit value (5-620).

[0053] P2: The scan cycle after inserting the arm is used to calculate the position and the amplitude limit (5-620).

[0054] The mean value of the proportional control coefficient for the insertion arm lifting is the average value of each parameter (λ).

[0055] The beneficial effects of this invention are as follows:

[0056] This invention ensures that during automated hot rolling mill production, the hot coil box insertion arm does not experience frequent sensor failures due to harsh installation environments, thus preventing significant downtime and scrap steel generation, thereby achieving the production line's cost reduction and efficiency improvement goals. Furthermore, the position soft-detection control technology, replacing physical position sensors, can significantly reduce downtime and spare parts costs. Implementation

[0057] To make the above-mentioned objectives, features, and advantages of the present invention more apparent and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below through examples. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0058] The present invention provides an analog alternative method for a hot roll box position sensor, wherein the unwinding arm and the insertion arm of the hot roll box are connected, the insertion arm is driven to rotate by a hydraulic cylinder, and the hydraulic cylinder is powered by a servo valve.

[0059] Analog alternatives for hot roll box position sensors include:

[0060] The current value of the servo valve is obtained, and the valve core opening degree is calculated based on the current value. This calculated degree is then compared with the actual valve core opening degree of the servo valve.

[0061] When the difference between the calculated opening degree of the valve core and the actual opening degree of the valve core is less than the proportional threshold, the position of the insertion arm is calculated using the parameter value.

[0062] When the difference between the calculated opening degree of the valve core and the actual opening degree of the valve core is greater than the proportional threshold, the position of the insertion arm is calculated using the average value.

[0063] The ratio of the difference between the calculated opening degree and the actual opening degree of the valve core to the maximum opening degree of the valve core is given in the following table:

[0064] Difference between current input and valve core feedback (%) 1 2 3 4 5 6 7 Parameter (β) 1.276 1.318 1.4286 1.6276 / / / Parameter (λ) 1 1 1 1 / / /

[0065] The parameter values ​​include each parameter (β) and each parameter (λ) corresponding to the ratio of the difference between the calculated opening degree of the valve core and the actual opening degree of the valve core to the maximum opening degree of the valve core;

[0066] The average values ​​include the mean values ​​of each parameter (β) and each parameter (λ) corresponding to the ratio of the difference between the calculated opening degree of the valve core and the actual opening degree of the valve core to the maximum opening degree of the valve core.

[0067] The method for calculating the insertion arm using the parameter values ​​includes: a method for calculating the position of the insertion arm when it is raised;

[0068] The method for calculating the position of the insertion arm when it is raised is as follows:

[0069] P2 = KSVR×β×α1+P1

[0070] P2 = KSVR×β×α2+P1

[0071] KSVR: A coefficient is given for the action of the insertion arm servo valve;

[0072] β: The proportional control coefficient for lifting the insertion arm;

[0073] α1: The broken-line compensation coefficient for insert arm pressure control, α1=0.00499;

[0074] α2: The broken line compensation coefficient for insert arm position control, α2=0.00608;

[0075] P1: The pre-scanning cycle before inserting the arm is used to calculate the position and limit value (5-620).

[0076] P2: The scan cycle after inserting the arm is used to calculate the position and the amplitude limit (5-620).

[0077] The method for calculating the insertion arm using the parameter values ​​includes: a method for calculating the position of the insertion arm when it falls;

[0078] The method for calculating the position of the insertion arm when it falls is as follows:

[0079] P2=KSVR×λ×α1+P1

[0080] P2 = KSVR × λ × α2 + P1

[0081] KSVR: A coefficient is given for the action of the insertion arm servo valve;

[0082] λ: The proportional control coefficient for the insertion arm's drop;

[0083] α1: The broken-line compensation coefficient for insert arm pressure control, α1=0.00499;

[0084] α2: The broken line compensation coefficient for insert arm position control, α2=0.00608;

[0085] P1: The pre-scanning cycle before inserting the arm is used to calculate the position and limit value (5-620).

[0086] P2: The scan cycle after inserting the arm is used to calculate the position and the amplitude limit (5-620).

[0087] The method for calculating the insertion arm using the parameter values ​​includes: a method for calculating the position of the insertion arm when it is raised;

[0088] The method for calculating the position of the insertion arm when it is raised is as follows:

[0089] P2 = KSVR×β'×α1+P1

[0090] P2 = KSVR×β'×α2+P1

[0091] KSVR: A coefficient is given for the action of the insertion arm servo valve;

[0092] β': The mean value of the proportional control coefficient for the lifting of the insertion arm;

[0093] α1: The broken-line compensation coefficient for insert arm pressure control, α1=0.00499;

[0094] α2: The broken line compensation coefficient for insert arm position control, α2=0.00608;

[0095] P1: The pre-scanning cycle before inserting the arm is used to calculate the position and limit value (5-620).

[0096] P2: The scan cycle after inserting the arm is used to calculate the position and the amplitude limit (5-620).

[0097] The mean value of the proportional coefficient for the lifting control of the insertion arm is the average value of each parameter (β).

[0098] The method for calculating the insertion arm using the parameter values ​​includes: a method for calculating the position of the insertion arm when it falls;

[0099] The method for calculating the position of the insertion arm when it falls is as follows:

[0100] P2=KSVR×λ'×α1+P1

[0101] P2=KSVR×λ'×α2+P1

[0102] KSVR: A coefficient is given for the action of the insertion arm servo valve;

[0103] λ': The mean value of the control coefficient for the insertion arm dropping;

[0104] α1: The broken-line compensation coefficient for insert arm pressure control, α1=0.00499;

[0105] α2: The broken line compensation coefficient for insert arm position control, α2=0.00608;

[0106] P1: The pre-scanning cycle before inserting the arm is used to calculate the position and limit value (5-620).

[0107] P2: The scan cycle after inserting the arm is used to calculate the position and the amplitude limit (5-620).

[0108] The mean value of the proportional control coefficient for the insertion arm lifting is the average value of each parameter (λ).

[0109] In this invention, the operating position of the insertion arm also includes a limiting value (i.e., an upper limit of 620mm and a lower limit of 5mm). This can prevent the soft-sensor feedback value from exceeding the limit due to unexpected unnecessary movements of the servo valve, thus preventing steel feeding.

[0110] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0111] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for simulating a hot coil box position sensor, a decoiler arm and an insertion arm of the hot coil box are connected, the insertion arm is driven to flip by a hydraulic cylinder, and the hydraulic cylinder is powered by a servo valve; characterized in that The method for simulating the hot coil box position sensor comprises: Obtaining a current value of the servo valve, and calculating a valve core opening degree of the servo valve through the current value, and comparing the valve core opening degree with a real valve core opening degree of the servo valve, When a difference between the valve core calculated opening degree and the real valve core opening degree is less than a proportional threshold value, a parameter value is used to calculate a position of the insertion arm; When the difference between the valve core calculated opening degree and the real valve core opening degree is greater than the proportional threshold value, an average value is used to calculate the position of the insertion arm; Wherein, a ratio of the difference between the valve core calculated opening degree and the real valve core opening degree to a maximum valve core opening degree corresponds to a parameter value as shown in the following table: The parameter value includes each parameter β and each parameter λ corresponding to the ratio of the difference between the valve core calculated opening degree and the real valve core opening degree to the maximum valve core opening degree; The average value includes a mean value of each parameter β and a mean value of each parameter λ corresponding to the ratio of the difference between the valve core calculated opening degree and the real valve core opening degree to the maximum valve core opening degree; The method for calculating the position of the insertion arm using the parameter value comprises a position calculation method when the insertion arm is lifted; The position calculation method when the insertion arm is lifted is as follows: P2 = KSVR×β×α1+P1 P2 = KSVR×β×α2+P1 KSVR: is a given coefficient of the servo valve action of the insertion arm; β: is a lifting control proportional coefficient of the insertion arm; λ: is a falling control proportional coefficient of the insertion arm; α1: is a fold line compensation coefficient when the insertion arm pressure is controlled, α1=0.00499; α2: is a fold line compensation coefficient when the insertion arm position is controlled, α2=0.00608; P1: is a calculated position of a previous scanning period of the insertion arm, and the amplitude value is 5-620; P2: is a calculated position of a subsequent scanning period of the insertion arm, and the amplitude value is 5-620.

2. The analog replacement method of a hot coiler position sensor according to claim 1, characterized in that, The method for calculating the position of the insertion arm using the parameter value comprises a position calculation method when the insertion arm is lifted; The position calculation method when the insertion arm is lifted is as follows: P2 = KSVR×β×α1+P1 P2 = KSVR×β×α2+P1.

3. The analog replacement method of a hot coiler position sensor according to claim 1, characterized in that, The method for calculating the position of the insertion arm using the average value comprises a position calculation method when the insertion arm is lifted; The position calculation method when the insertion arm is lifted is as follows: P2 = KSVR×β’×α1+P1 P2 = KSVR×β’×α2+P1 β’: is a mean value of the lifting control proportional coefficient of the insertion arm.

4. The analog replacement method of a hot coiler position sensor according to claim 3, characterized in that, The β’ is the mean value of the lifting control proportional coefficient of the insertion arm, which is the average value of each parameter β.

5. The analog replacement method of a hot coiler position sensor according to claim 1, characterized in that, The method for calculating the position of the insertion arm using the average value comprises a position calculation method when the insertion arm is lifted; The position calculation method when the insertion arm is lifted is as follows: P2 = KSVR×β’×α1+P1 P2 = KSVR×β’×α2+P1 λ’: is a mean value of the falling control proportional coefficient of the insertion arm.

6. The analog replacement method of a hot coiler position sensor according to claim 5, characterized in that, The mean value of the lifting control proportional coefficient of the insertion arm is the average value of each parameter λ.