Method for adjusting, controlling and compensating opening degree of inlet guide of finishing mill

Abstract

The invention relates to the technical field of plate and strip rolling mills, and particularly discloses a finishing mill inlet guide opening degree adjustment control compensation method, which comprises the following steps of: firstly, carrying out zero calibration on a displacement sensor of a driving hydraulic cylinder by using a design limit minimum value of the finishing mill inlet guide opening degree; the abrasion clearance m value of each connecting pin shaft and hole of the guide and guard plate hydraulic cylinders driving the DS transmission side and the OS operation side is manually measured regularly and respectively; opening an operation picture of the opening degree setting model during inlet guide and guard production, adding compensation 2m to a margin value A in opening degree preset values during steel passing, not compensating a margin value B in short-stroke use opening degree set values during steel passing, and adding compensation 2m to a margin value C in opening degree set values at the tail part of strip steel; and after compensation, three opening degree setting theoretical calculation values of the inlet guide and guard unit for producing each piece of steel are consistent with the actual opening degree value. According to the method, the influence of a connecting pin shaft and a hole abrasion gap on the opening degree setting adjustment value is greatly reduced or eliminated.

Description

Technical Field

[0001] The invention relates to the technical field of plate and strip rolling mills, and in particular to a method for adjusting, controlling and compensating the opening degree of an entrance guide guard of a finishing rolling mill. Background Art

[0002] The main function of the entrance guide of the finishing mill is to smoothly guide the intermediate billet into the rolling mill and to center the strip. In order to meet the needs of rolling products of different width specifications, the entrance guide has the function of adjusting the opening value, which is completed by the guide plate driven by the hydraulic cylinder. The guide plates on the operating side (OS) and the transmission side (DS) are symmetrically arranged and driven separately. The displacement value of the guide plate is measured and fed back by the displacement sensor installed inside the hydraulic cylinder.

[0003] The existing technology has the following disadvantages in the use of the entrance guide of the finishing mill: First, when the wear gap of the connecting pins and holes of the driving hydraulic cylinder is too large, the wear gap is eliminated by filling with gaskets or replacing the sleeve parts, which is time-consuming and laborious due to the narrow working space; second, when the gap is small, it is difficult to repair the filling gasket, resulting in a decrease in the accuracy of the opening adjustment function. Therefore, a method for adjusting the opening degree of the entrance guide of the finishing mill is designed to solve the problem of low opening degree adjustment accuracy caused by the gap in the process of the existing entrance guide driving hydraulic cylinder driving the guide plate to move. Summary of the invention

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide a method for adjusting, controlling and compensating the opening degree of an entrance guide of a plate and strip finishing mill, so as to eliminate or reduce the influence of component wear on the opening degree setting adjustment value.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a method for adjusting, controlling and compensating the opening degree of the guide guard at the entrance of a finishing mill, comprising the following steps:

[0006] 1) The structure of the guide device at the entrance of the finishing mill includes the driving hydraulic cylinders on both sides and the guide plate in the middle. The fixed connection pin and hole of the hydraulic cylinder on one side are worn out and a gap m is generated;

[0007] 2) The calculation formula for controlling the opening value of the guide guard at the entrance of the finishing mill is:

[0008] W ACT =W DS_ACT +W OS_ACT

[0009] =(W DS_CNT -W DS_CNT_Z )*X DS_INC +W DS_Z +(W OS_CNT -W OS_CNT_Z )*X OS_INC +W OS_Z;

[0010] 3) The zero position calibration of the displacement sensor of the driving hydraulic cylinder is carried out according to the minimum design limit of the opening degree of the guide guard at the entrance of the finishing mill;

[0011] 4) The opening degree setting model of the entrance guide of the finishing mill during production, and the entrance guide of each strip rolled is set with three opening degree values;

[0012] 5) The influence of the wear clearance on the opening value is compensated by adjusting the margin value of the opening setting model, and it is determined whether the theoretical calculation value of the opening value setting after compensation is consistent with the actual opening value.

[0013] Specifically, the driving hydraulic cylinder in step 1) includes a hydraulic cylinder body, a bearing seat, a displacement sensor and a hydraulic cylinder plunger rod. The hydraulic cylinder body is installed on the bearing seat, and the displacement sensor is installed inside the hydraulic cylinder body. The displacement sensor identifies the displacement of the hydraulic cylinder plunger rod, and the hydraulic cylinder plunger rod is connected to the guide plate through a pin shaft.

[0014] Specifically, in the formula of step 2):

[0015] W ACT : Entrance guide opening value, unit: mm;

[0016] W DS_ACT : DS transmission side guide plate opening value, unit: mm;

[0017] W OS_ACT : OS operating side guide plate opening value, unit: mm;

[0018] W DS_CNT : Display value of the hydraulic cylinder displacement sensor on the DS transmission side, unit CNT;

[0019] W DS_CNT_Z : DS transmission side hydraulic cylinder displacement sensor zero value, unit CNT;

[0020] X DS_INC : DS transmission side displacement sensor sensitivity coefficient, unit: mm / CNT;

[0021] W DS_Z : The opening value of the DS transmission side guide plate when it is in zero position, in mm;

[0022] W OS_CNT : Display value of the hydraulic cylinder displacement sensor on the OS operating side, unit CNT;

[0023] W OS_CNT_Z : Zero position value of the hydraulic cylinder displacement sensor on the OS operating side, unit CNT;

[0024] X OS_INC: OS operating side displacement sensor sensitivity coefficient, unit: mm / CNT;

[0025] W OS_Z : The opening value when the guide plate on the OS operating side is in zero position, unit: mm.

[0026] Specifically, the specific steps of the zero position calibration in step 3) are: the guide plates on the DS transmission side and the OS operation side are stopped at an opening position, and the values ​​W of the guide plates on the DS transmission side and the OS operation side from the rolling center line are measured manually on site. DS_Z and W OS_Z , input the measured value into the zero position calibration operation screen of the control system, and the system automatically records the zero position value W of the displacement sensor of the driving hydraulic cylinder on the DS transmission side and the OS operation side. DS_CNT_Z , W OS_CNT_Z , measure, calculate and adjust the opening value of the guide plate based on the zero position value.

[0027] Specifically, the opening value in the step 4) includes a preset value when waiting for steel, a short stroke setting value when passing steel, and a setting value at the tail of the strip. The preset value when waiting for steel is the strip width plus a margin value A, the short stroke setting value when passing steel is the strip width plus a margin value B, and the setting value at the tail of the strip is the strip width plus a margin value C.

[0028] Specifically, in the adjustment of the margin value of the opening setting model in the step 5), the influence of the wear clearance of each connecting pin and hole of the driving hydraulic cylinder under zero position calibration with the minimum value of the guide opening limit on the three opening values ​​in the setting model when producing each steel is as follows: when treating steel, the margin value A in the preset opening value is compensated by 2m, and the margin value B in the short stroke opening setting value when passing steel is not compensated, and the margin value C in the opening setting value at the tail of the strip is compensated by 2m; after compensation, the theoretical calculation value of the opening value setting is consistent with the actual opening value.

[0029] The present invention has the following beneficial effects:

[0030] The method for adjusting, controlling and compensating the opening degree of an entrance guide of a finishing mill designed by the present invention performs zero-position calibration at the position of the design limit minimum value of the entrance guide opening degree, and after spot inspection finds that there is a gap due to wear of a connecting pin shaft and a hole of a driving hydraulic cylinder, measures the gap value with a ruler, and compensates and corrects the margin value A, the margin value B and the margin value C in the opening degree setting model operation screen, respectively, thereby greatly reducing or eliminating the influence of the gap of the connecting pin shaft and the hole wear on the opening degree setting adjustment value. The method is simple to operate, saves time and effort, and is highly efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a structural diagram of the finishing mill entrance guide opening limit minimum value.

[0032] Figure 2 This is a schematic diagram of the structure of the entrance guide device of the finishing mill.

[0033] Figure 3 A model diagram is set for the opening degree of the entrance guide of the finishing mill for each steel rolled.

[0034] In the figure: 1- hydraulic cylinder body; 2- bearing seat; 3- displacement sensor; 4- hydraulic cylinder plunger rod; 5- guide plate. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely further describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] like Figure 1-Figure 3 As shown, a method for adjusting, controlling and compensating the opening degree of the entrance guide of a finishing mill comprises the following steps:

[0037] 1. The structure of the guide device at the entrance of the finishing mill: It includes driving hydraulic cylinders on both sides and a guide plate 5 in the middle. The driving hydraulic cylinder includes a hydraulic cylinder body 1, a bearing seat 2, a displacement sensor 3 and a hydraulic cylinder plunger rod 4. The hydraulic cylinder body 1 is installed on the bearing seat 2, and the displacement sensor 3 is installed inside the hydraulic cylinder body 1. The displacement sensor 3 identifies the displacement of the hydraulic cylinder plunger rod 4, and the hydraulic cylinder plunger rod 4 is connected to the guide plate 5 through a pin shaft.

[0038] In order to smoothly introduce the intermediate billet, centering control and other functional needs, the hydraulic cylinder drives the guide plate 5 three times for each rolling of a steel. Due to the influence of factors such as frequent movements, harsh water vapor environment, and poor lubrication, the wear of the fixed connection pin and hole of the single-sided driving hydraulic cylinder is aggravated, resulting in a gap m (m=m1+m2); before the driving hydraulic cylinder drives the guide plate 5 to adjust the opening, it must first move to eliminate the gap caused by wear before pushing or pulling the guide plate 5. The wear gap is already included in the measurement feedback value of the hydraulic cylinder displacement sensor 3, resulting in the actual opening value of the guide plate 5 being different from the theoretical calculated value, affecting the accuracy of the opening adjustment value of the guide plate 5, and thus affecting production.

[0039] 2. The calculation formula for controlling the opening value of the guide guard at the entrance of the finishing mill is:

[0040] W ACT =W DS_ACT +W OS_ACT

[0041] =(W DS_CNT -W DS_CNT_Z )*X DS_INC +W DS_Z +(WOS_CNT -W OS_CNT_Z )*X OS_INC +W OS_Z ;

[0042] In the formula:

[0043] W ACT : Entrance guide opening value, unit: mm;

[0044] W DS_ACT : DS transmission side guide plate opening value, unit: mm;

[0045] W OS_ACT : OS operating side guide plate opening value, unit: mm;

[0046] W DS_CNT : Display value of the hydraulic cylinder displacement sensor on the DS transmission side, unit CNT;

[0047] W DS_CNT_Z : DS transmission side hydraulic cylinder displacement sensor zero value, unit CNT;

[0048] X DS_INC : DS transmission side displacement sensor sensitivity coefficient, unit: mm / CNT;

[0049] W DS_Z : The opening value of the DS transmission side guide plate when it is in zero position, in mm;

[0050] W OS_CNT : Display value of the hydraulic cylinder displacement sensor on the OS operating side, unit CNT;

[0051] W OS_CNT_Z : Zero position value of the hydraulic cylinder displacement sensor on the OS operating side, unit CNT;

[0052] X OS_INC : OS operating side displacement sensor sensitivity coefficient, unit: mm / CNT;

[0053] W OS_Z : The opening value when the guide plate on the OS operating side is in zero position, unit: mm.

[0054] 3. Zero position calibration of the opening degree of the entrance guide of the finishing mill: The zero position calibration of the displacement sensor 3 of the driving hydraulic cylinder is carried out according to the design limit minimum value of the opening degree of the entrance guide of the finishing mill.

[0055] The guide plates on the DS transmission side and the OS operation side are stopped at an opening position, and the distances of the guide plates on the DS transmission side and the OS operation side from the rolling center line are measured manually on site. DS_Z and W OS_Z, input the measured value into the zero position calibration operation screen of the control system, and the system automatically records the zero position value W of the displacement sensor of the driving hydraulic cylinder on the DS transmission side and the OS operation side. DS_CNT_Z , W OS_CNT_Z , measure, calculate and adjust the opening value of the guide plate based on the zero position value.

[0056] 4. The opening setting model of the finishing mill entrance guide during production: Figure 3 As shown, in order to smoothly introduce the strip, plate shape and tail swinging control and other functions during production, three opening values ​​are set for each strip entrance guide for rolling; the opening value includes a preset value for waiting for steel, a short stroke setting value for passing steel and a setting value for the tail of the strip. The preset value for waiting for steel is the strip width plus the allowance value A, the short stroke setting value for passing steel is the strip width plus the allowance value B, and the setting value for the tail of the strip is the strip width plus the allowance value C.

[0057] 5. According to the structure of the entrance guide opening adjustment device of the finishing mill, the calculation of the opening value, the zero-position calibration principle and the opening setting model for each steel production, it is found that when the minimum value of the guide opening limit is used for zero-position calibration, the wear clearance of the connecting pins and holes of the driving hydraulic cylinder has an influence on the three opening values ​​in the setting model when each steel is produced, which are -2m, 0, and -2m respectively. The design adopts the adjustment of the margin value of the opening setting model to compensate for the influence of the wear clearance on the opening value. After compensation, the theoretical calculation value of the opening setting is consistent with the actual opening value.

[0058] When adjusting the margin value of the opening setting model, the minimum opening limit value of the guide is zero-calibrated, and the wear clearance of the connecting pins and holes of the driving hydraulic cylinder affects the three opening values ​​in the model when producing each steel. The margin value A in the preset opening value is compensated by 2m when treating steel, and the margin value B in the short-stroke opening setting value when passing steel is not compensated. The margin value C in the opening setting value at the tail of the strip is compensated by 2m. After compensation, the theoretical calculation value of the opening setting is consistent with the actual opening value.

[0059] Implementation plan flow: First, the zero position calibration of the driving hydraulic cylinder displacement sensor is carried out with the minimum design limit of the opening of the finishing mill entrance guide; the m values ​​(m=m1+m2) of the connecting pins and hole wear clearances of the guide plate 5 hydraulic cylinder driving the DS transmission side and the OS operation side are measured manually and regularly; the operation screen of the entrance guide opening setting model is opened, and the margin value A in the preset value of the opening is increased by 2m for treating steel, and the margin value B in the opening setting value for short stroke use during steel passing is not compensated, and the margin value C in the opening setting value at the tail of the strip is increased by 2m for compensation; after compensation, the three theoretical calculation values ​​of the opening setting of the entrance guide in the production of each steel are consistent with the actual opening values, which greatly reduces or eliminates the influence of the connecting pin and hole wear clearance on the opening setting value.

[0060] The present invention is not limited to the above-mentioned implementation modes, and anyone should be aware of the structural changes made under the enlightenment of the present invention, and all those having the same or similar technical solutions as the present invention fall within the protection scope of the present invention.

[0061] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.

Claims

1. A method for adjusting, controlling and compensating the opening degree of the entrance guide of a finishing mill, characterized in that: The following steps are involved: 1) The structure of the guide device at the entrance of the finishing mill includes the driving hydraulic cylinders on both sides and the guide plate in the middle. The fixed connection pin and hole of the hydraulic cylinder on one side are worn out and a gap m is generated; 2) The calculation formula for controlling the opening value of the guide guard at the entrance of the finishing mill is: W ACT =W DS_ACT +W OS_ACT =(W DS_CNT -W DS_CNT_Z )*X DS_INC +W DS_Z +(W OS_CNT -W OS_CNT_Z )*X OS_INC +W OS_Z ; 3) The zero position calibration of the displacement sensor of the driving hydraulic cylinder is carried out according to the minimum design limit of the opening degree of the guide guard at the entrance of the finishing mill; 4) The opening degree setting model of the entrance guide of the finishing mill during production, and the entrance guide of each strip rolled is set with three opening degree values; 5) The influence of wear clearance on the opening value is compensated by adjusting the margin value of the opening setting model. After compensation, the theoretical calculation value of the opening setting is consistent with the actual opening value.

2. The method for adjusting, controlling and compensating the opening degree of the entrance guide of the finishing mill according to claim 1 is characterized in that: The driving hydraulic cylinder in step 1) includes a hydraulic cylinder body, a bearing seat, a displacement sensor and a hydraulic cylinder plunger rod. The hydraulic cylinder body is installed on the bearing seat, and the displacement sensor is installed inside the hydraulic cylinder body. The displacement sensor identifies the displacement of the hydraulic cylinder plunger rod, and the hydraulic cylinder plunger rod is connected to the guide plate through a pin shaft.

3. The method for adjusting, controlling and compensating the opening degree of the entrance guide of the finishing mill according to claim 1, characterized in that: In the formula of step 2): W ACT : Entrance guide opening value, unit: mm; W DS_ACT : DS transmission side guide plate opening value, unit: mm; W OS_ACT : OS operating side guide plate opening value, unit: mm; W DS_CNT : Display value of the hydraulic cylinder displacement sensor on the DS transmission side, unit CNT; W DS_CNT_Z : DS transmission side hydraulic cylinder displacement sensor zero value, unit CNT; X DS_INC : DS transmission side displacement sensor sensitivity coefficient, unit: mm / CNT; W DS_Z : The opening value of the DS transmission side guide plate when it is in zero position, in mm; W OS_CNT : Display value of the hydraulic cylinder displacement sensor on the OS operating side, unit CNT; W OS_CNT_Z : Zero position value of the hydraulic cylinder displacement sensor on the OS operating side, unit CNT; X OS_INC : OS operating side displacement sensor sensitivity coefficient, unit: mm / CNT; W OS_Z : The opening value when the guide plate on the OS operating side is in zero position, unit: mm.

4. The method for adjusting, controlling and compensating the opening degree of the entrance guide of a finishing mill according to claim 1, characterized in that: The specific steps of zero position calibration in step 3) are as follows: the guide plates on the DS transmission side and the OS operation side are stopped at an opening position, and the values ​​W of the guide plates on the DS transmission side and the OS operation side from the rolling center line are measured manually on site. DS_Z and W OS_Z , input the measured value into the zero position calibration operation screen of the control system, and the system automatically records the zero position value W of the displacement sensor of the driving hydraulic cylinder on the DS transmission side and the OS operation side. DS_CNT_Z , W OS_CNT_Z , measure, calculate and adjust the opening value of the guide plate based on the zero value.

5. The method for adjusting, controlling and compensating the opening degree of the entrance guide of a finishing mill according to claim 1, characterized in that: The opening value in the step 4) includes a preset value when waiting for steel, a short stroke setting value when passing steel, and a setting value at the tail of the strip. The preset value when waiting for steel is the strip width plus a margin value A, the short stroke setting value when passing steel is the strip width plus a margin value B, and the setting value at the tail of the strip is the strip width plus a margin value C.

6. The method for adjusting, controlling and compensating the opening degree of the entrance guide of the finishing mill according to claim 5, characterized in that: In the adjustment of the margin value of the opening setting model in the step 5), the influence of the wear clearance of each connecting pin and hole of the driving hydraulic cylinder on the three opening values ​​in the setting model when each steel is produced is as follows: when treating steel, the margin value A in the preset opening value is increased by 2m for compensation, when passing steel, the margin value B in the short stroke opening setting value is not compensated, and when at the tail of the strip, the margin value C in the opening setting value is increased by 2m for compensation; after compensation, the theoretical calculation value of the opening value setting is consistent with the actual opening value.

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