Method for reducing deviation of extension amount of hydraulic cylinders on two sides after roll gap leveling in rough rolling process

Abstract

The invention belongs to the field of metallurgical automation control, and particularly relates to a method for reducing the deviation of the extension amount of hydraulic cylinders on two sides after roll gap leveling in a rough rolling process, which comprises the following steps of: S1, observing the deviation of the extension amount of the hydraulic cylinders of a hydraulic screw-down device during normal rolling, and recording as A; s2, observing the deviation of the total roll gap of the electric screw-down device and the hydraulic screw-down device, and recording the deviation as B; s3, before next zero adjustment, the electric screw-down device controls movement A + B; s4, selecting electric press-down linkage, and performing normal zero adjustment; the deviation of the extension amount of the transmission side and the operation side of the hydraulic screw-down device during normal rolling and the deviation of the transmission side and the operation side of the electric screw-down device and the total roll gap of the hydraulic screw-down device are observed, and then compensation is conducted through the single-action electric screw-down device. Therefore, the deviation of the extension amount of the hydraulic cylinder on the transmission side and the operation side of the hydraulic screw-down device is reduced when zero adjustment is carried out again, and the hydraulic cylinder has a large adjustment range in the positive direction and the negative direction during production and is not unloaded.

Description

Technical Field

[0001] The invention relates to the field of metallurgical automation control, in particular to a method for reducing the deviation of extension amounts of hydraulic cylinders on both sides after roll gap leveling in a rough rolling process. Background Art

[0002] In the medium and wide width hot rolling, the pressing device of the roughing mill is mostly electric pressing plus hydraulic pressing. In the electric plus hydraulic pressing system, when the roll gap is swinging normally, the electric pressing is quickly adjusted first, and the electric stop is made when it is close to the target roll gap. The deviation between the electric roll gap and the set roll gap is compensated by the hydraulic pressing.

[0003] Zero adjustment is an important step in production. Zero adjustment is to determine the position of the zero roll gap. Generally, when the upper and lower rolls are in contact and the pressure on the operating side and the transmission side reaches 1000 tons, and the pressure difference on both sides is within plus or minus 20 tons, the zero adjustment is considered to be completed. When doing zero adjustment, the electric pressure is pressed down. When the pressure on the operating side and the transmission side reaches 100 tons, the hydraulic pressure continues to press down. The hydraulic cylinders on the operating side and the transmission side are pressed down and leveled. In order to make the pressure difference between the operating side and the transmission side within ±20 tons, the extension of the hydraulic cylinders on the operating side and the transmission side is generally different when the zero adjustment is completed.

[0004] When zero adjustment is completed, it is considered that the roller gaps on the operating side and the transmission side are consistent, both are 0 roller gaps. However, due to the gap in the equipment, when the pressure reaches the position when zero adjustment is completed, the extension amount of the hydraulic cylinder on the operating side and the transmission side will deviate;

[0005] Since the electric pressing device cannot press down with load, the hydraulic pressing device is adjusted when the plate shape needs to be adjusted. In order to protect the equipment, it is generally set to unload when the extension deviation of the hydraulic cylinders on both sides is greater than Cmm during production. In order to make the hydraulic cylinder have a large adjustment range in both positive and negative directions during production without unloading, it is necessary to minimize the deviation of the extension of the hydraulic cylinders on the transmission side and the operating side of the hydraulic pressing device when zero adjustment is completed. Therefore, in response to the above problem, a method for reducing the deviation of the extension of the hydraulic cylinders on both sides after roll gap leveling in a rough rolling process is proposed. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art and solve at least one technical problem raised in the background technology, the present invention proposes a method for reducing the deviation of the extension amount of hydraulic cylinders on both sides after roll gap leveling in a rough rolling process.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a method for reducing the deviation of the extension amount of hydraulic cylinders on both sides after roll gap leveling in a rough rolling process of the present invention, the method comprises the following steps:

[0008] S1: Observe the deviation of the extension of the hydraulic cylinder of the hydraulic pressing device during normal rolling, recorded as A, unit: mm;

[0009] S2: Observe the deviation of the total roll gap between the electric press device and the hydraulic press device, recorded as B, unit: mm;

[0010] S3: Before the next zero adjustment, the electric pressing device controls the movement A+B, unit: mm;

[0011] S4: Select the electric pressure linkage to perform normal zero adjustment.

[0012] The present invention is beneficial in that:

[0013] 1. The present invention observes the deviation of the extension amount of the transmission side and the operating side of the hydraulic hold-down device during normal rolling, as well as the deviation of the transmission side and the operating side of the total roll gap between the electric hold-down device and the hydraulic hold-down device, and then compensates for it through a single-acting electric hold-down device, thereby reducing the deviation of the extension amount of the hydraulic cylinder on the transmission side and the operating side of the hydraulic hold-down device when zero-adjusting again, so that the hydraulic cylinder has a large adjustment range in both positive and negative directions during production without unloading. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 is a flow chart of the method of the present invention; DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] Specific examples are given below.

[0018] See also Figure 1 As shown, a method for reducing the deviation of the extension amount of hydraulic cylinders on both sides after roll gap leveling in a rough rolling process comprises the following steps:

[0019] S1: Observe the deviation of the extension of the hydraulic cylinders on the transmission side and the operating side of the hydraulic press device during normal rolling, recorded as A, unit: mm;

[0020] S2: Observe the deviation of the total roll gap between the electric and hydraulic press-down devices on the transmission and operating sides, denoted as B, in mm;

[0021] S3: Before the next zero adjustment, first select the transmission side single action for the electric pressing device, and then press the transmission side of the electric pressing device down by A+B, in mm, or select the operating side single action, and lift the operating side of the electric pressing device up by A+B, in mm;

[0022] S4: Select the electric press-down linkage and perform normal zero adjustment. When the zero adjustment is completed, the deviation between the transmission side and the operating side of the hydraulic press-down device will be further reduced.

[0023] In actual application, follow the steps below:

[0024] (1) Observe the extension of the hydraulic cylinder on the transmission side of the hydraulic press device during normal rolling on the HMI human-machine interface, recorded as L1DS;

[0025] (2) Observe the extension of the hydraulic cylinder on the operating side, recorded as L1WS;

[0026] (3) Calculate the deviation of the extension of the hydraulic cylinders on both sides, L1DS-L1WS, recorded as A;

[0027] (4) Observe the roller gap on the transmission side of the electric screw-down device, recorded as L2DS;

[0028] (5) Observe the electric roller gap on the operating side, recorded as L2WS;

[0029] (6) Observe the roller gap on the transmission side of the hydraulic screw-down device, recorded as L3DS;

[0030] (7) Observe the hydraulic roll gap on the operating side, recorded as L3WS;

[0031] (8) Calculate L2DS+L3DS-L2WS-L3 WS, denoted as B;

[0032] (9) Select the transmission side single action of the electric pressing device, and then press the transmission side of the electric pressing device down A+B;

[0033] (10) If the electric push-down linkage is selected and normal zero adjustment is performed, the deviation in the extension amount of the hydraulic cylinder on the transmission side and the operating side of the hydraulic push-down device will be reduced when the zero adjustment is completed.

[0034] The units of the extension amount, roll gap and deviation in steps (1) to (10) are all mm.

[0035] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A method for reducing the deviation of the extension amount of hydraulic cylinders on both sides after roll gap leveling in a rough rolling process, characterized in that: The method comprises the following steps: S1: Observe the deviation of the extension of the hydraulic cylinder of the hydraulic pressing device during normal rolling, recorded as A, unit: mm; S2: Observe the deviation of the total roll gap between the electric press device and the hydraulic press device, recorded as B, unit: mm; S3: Before the next zero adjustment, the electric pressing device controls the movement A+B, unit: mm; S4: Select the electric pressure linkage to perform normal zero adjustment.

2. According to claim 1, a method for reducing the deviation of the extension amount of hydraulic cylinders on both sides after roll gap leveling in a rough rolling process, characterized in that: The deviation between S1 and S2 is the deviation between the transmission side and the operating side.

3. The method for reducing the deviation of the extension amount of hydraulic cylinders on both sides after roll gap leveling in a rough rolling process according to claim 1, characterized in that: In S3, when the electric pressing device selects the transmission side single action, the transmission side of the electric pressing device presses down A+B, in mm.

4. The method for reducing the deviation of the extension amount of hydraulic cylinders on both sides after roll gap leveling in a rough rolling process according to claim 1 is characterized in that: In S3, when the electric pressing device selects single action on the operating side, the operating side of the electric pressing device is lifted up by A+B, in mm.

Images