A method for adjusting, controlling and compensating the opening degree of the entrance guide of a finishing mill

Abstract

The invention relates to the technical field of plate and strip rolling mills, and specifically discloses a method for adjusting, controlling and compensating the opening degree of an entrance guide of a finishing mill. First, the zero position of a driving hydraulic cylinder displacement sensor is calibrated with a minimum design limit value of the opening degree of the entrance guide of the finishing mill; the wear clearance m values ​​of connecting pins and holes of the guide plate hydraulic cylinder driving the DS transmission side and the OS operation side are respectively measured regularly and manually; an operation screen of an opening degree setting model during production of the entrance guide is opened, and a compensation of 2m is added to a margin value A in a preset opening degree value when treating steel, no compensation is made to a margin value B in a short-stroke opening degree setting value when passing steel, and a compensation of 2m is added to a margin value C in a setting value of the opening degree at the tail of the strip; after compensation, three theoretical calculation values ​​of the opening degree settings of the entrance guide in producing each piece of steel are consistent with actual opening values, and the invention greatly reduces or eliminates the influence of the wear clearance of connecting pins and holes on the opening degree setting adjustment value.

Description

Technical Field

[0001] The present 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 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 achieved by driving the guide plate by a hydraulic cylinder. The operating side (OS) and drive side (DS) guide plates 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 finishing mill entrance guide has the following shortcomings during use: First, when the wear clearances between the connecting pins and holes of the driving hydraulic cylinder are too large, shimming or replacing the sleeve components is required to eliminate the wear clearances, which is time-consuming and labor-intensive due to the limited working space. Second, when the clearances are small, shimming is difficult to repair, resulting in reduced accuracy in the aperture adjustment function. Therefore, a method for adjusting and controlling the aperture of the finishing mill entrance guide was designed to address the problem of low aperture adjustment accuracy caused by the gaps caused by the guide plate movement during the hydraulic cylinder driving the finishing mill entrance guide. 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 the 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 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 is set during production. 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 whether the theoretical calculation value of the opening value after compensation is consistent with the actual opening value is determined.

[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, 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, unit: 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 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 at zero position, unit: mm.

[0026] Specifically, the specific steps of the 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 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 value.

[0027] Specifically, the opening value in 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 the allowance value A, the short stroke setting value when passing steel is the strip width plus the allowance value B, and the setting value at the tail of the strip is the strip width plus the allowance 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 the connecting pins and holes of the driving hydraulic cylinder under the zero position calibration with the minimum value of the guide opening limit 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 opening preset value is increased by 2m for compensation, the margin value B in the opening setting value for short stroke use when passing steel 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 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 present invention designs a finishing mill entrance guide opening adjustment control compensation method, which performs zero-position calibration at the entrance guide opening design limit minimum position, and after inspection finds that there is a gap due to wear of the connecting pin shaft and the hole of the driving hydraulic cylinder, measures the gap value with a ruler, and compensates and corrects the allowance value A, the allowance value B, and the allowance value C in the opening setting model operation screen, thereby greatly reducing or eliminating the influence of the gap of the connecting pin shaft and the hole wear on the opening setting adjustment value. This method is simple to operate, saves time and labor, 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 at the 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 accompanying 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 guide guard at the entrance of a finishing mill comprises the following steps:

[0037] 1. 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. 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, control the centering and other functions, the hydraulic cylinder drives the guide plate 5 to move three times for each steel rolling. Due to the influence of factors such as frequent movements, harsh water vapor environment, and poor lubrication, the fixed connection pin and hole of the single-sided driving hydraulic cylinder are aggravated by wear, 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 value of the opening 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, unit: 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 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 at zero position, unit: mm.

[0054] 3. Zero position calibration of the opening degree of the guide guard at the entrance of the finishing mill: The zero position calibration of the displacement sensor 3 of the driving hydraulic cylinder is performed based on the design limit minimum value of the opening degree of the guide guard at the entrance of the finishing mill.

[0055] The guide plates on the DS transmission side and the OS operating side are stopped at an opening position, and the distance W between the guide plates on the DS transmission side and the OS operating side and the rolling center line is 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.

[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 functions during production, three opening values ​​are set for each strip entrance guide; the opening value includes the pre-set value when waiting for steel, the short stroke setting value when passing steel and the setting value at the tail of the strip. The pre-set value when waiting for steel is the strip width plus the allowance value A, the short stroke setting value when passing steel is the strip width plus the allowance value B, and the setting value at the tail of the strip is the strip width plus the allowance value C.

[0057] 5. According to the structure of the guide opening adjustment device at the entrance of the finishing mill, the calculation of the opening value, the zero-position calibration principle and the opening setting model for each steel produced, it was 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] In the adjustment of 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 each steel is produced. The rules are as follows: when treating steel, the margin value A in the preset opening value is increased by 2m for compensation, 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 increased by 2m for compensation; after compensation, the theoretical calculation value of the opening setting is consistent with the actual opening value.

[0059] Implementation plan process: First, the zero position of the driving hydraulic cylinder displacement sensor is calibrated with the minimum design limit value of the opening of the finishing mill entrance guide; the m value (m=m1+m2) of the connecting pins and hole wear clearance of the guide plate 5 hydraulic cylinder driving the DS transmission side and the OS operation side is measured manually and regularly; the opening setting model operation screen during entrance guide production is opened, and the allowance value A in the preset value of the opening when treating steel is increased by 2m, and the allowance value B in the short stroke opening setting value when passing steel is not compensated, and the allowance value C in the opening setting value at the tail of the strip is increased by 2m; 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 wear clearance of the connecting pins and holes on the opening setting value.

[0060] The present invention is not limited to the above-mentioned embodiments. Anyone should be aware that any structural changes made under the guidance of the present invention, and any technical solutions that are the same or similar to those of the present invention, fall within the scope of protection of the present invention.

[0061] The technology, shape, and structure not described in detail in the present invention are all well-known technologies.

Claims

1. A method for adjusting, controlling and compensating the opening degree of the guide guard at the entrance 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 driving hydraulic cylinder fixed connection pin and hole wear aggravated to produce a gap m; 2) The calculation formula for controlling the opening value of the guide guard at the entrance of the finishing mill is: IN ACT = In DS_ACT + In 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 ; In the formula: 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, unit: mm; W OS_CNT : Display value of the hydraulic cylinder displacement sensor on the OS operating side, unit: CNT; W OS_CNT_Z : Zero 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 of the guide plate on the OS operating side when it is at zero position, in mm; 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 of the guide guard at the entrance of the finishing mill; 4) During the production of the finishing mill entrance guide, the opening setting model of each strip entrance guide is set with three opening values; 5) The influence of wear clearance on the opening value is compensated by adjusting the margin values ​​of the three opening values ​​in 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, 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. 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: 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 distances from the guide plates on the DS transmission side and the OS operation side to 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.

4. 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: The aperture value in step 4) includes a preset value when waiting for steel, a short stroke setting value when passing steel, and a setting value when the strip is at the tail end. The preset value when waiting for steel is the strip width plus the allowance value A, the short stroke setting value when passing steel is the strip width plus the allowance value B, and the setting value when the strip is at the tail end is the strip width plus the allowance value C.

5. The method for adjusting, controlling and compensating the opening degree of the entrance guide of the finishing mill according to claim 4, characterized in that: In the adjustment of the margin values ​​of the three aperture values ​​in the aperture setting model in the step 5), the influence of the wear clearance of the connecting pins and holes of the driving hydraulic cylinder on the three aperture values ​​in the setting model when each steel is produced is as follows: when treating steel, the margin value A in the preset aperture value is increased by 2m for compensation, 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 increased by 2m for compensation; after compensation, the theoretical calculation value of the aperture value setting is consistent with the actual aperture value.

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