CN107790507B

CN107790507B - Method for judging axial force of rolling working roll

Info

Publication number: CN107790507B
Application number: CN201610788692.XA
Authority: CN
Inventors: 范细忠; 高延东; 张吉富; 宁腾; 谢迎富
Original assignee: Angang Steel Co Ltd
Current assignee: Angang Steel Co Ltd
Priority date: 2016-08-31
Filing date: 2016-08-31
Publication date: 2020-02-18
Anticipated expiration: 2036-08-31
Also published as: CN107790507A

Abstract

The invention relates to a method for judging axial force of a rolling working roll, which is characterized in that an oil pressure sensor is additionally arranged on a hydraulic pipeline at the side of a rod of a working roll shifting cylinder, an oil pressure curve graph is drawn to be visually displayed, the axial force of the working roll of a rolling mill is dynamically monitored in real time, the axial bearing condition of a bearing of the working roll in the rolling process is monitored, and the historical record query of the axial force can be provided. The bearing box is inspected and repaired, so that the bearing box is prevented from being burnt, and the accident is controlled to be prevented in advance. Effectively reduces the economic loss of the accident occurrence and the accident generation time, and improves the benefit of enterprises. In addition, the states of the mechanical and horizontal precision of the rolling mill can be reflected, and a favorable basis is provided for recovering the precision, the horizontal precision and the like of mechanical equipment.

Description

Method for judging axial force of rolling working roll

Technical Field

The invention relates to the field of hot-rolled strip processes, in particular to a method for judging axial force of a rolling working roll.

Background

It is known that at present, over 65 percent of domestic hot rolling mills are roll shifting finishing mills, the axial connection mode of a working roll is that a bearing box is assembled at the end part of the working roll, the bearing box is fixed by a roll shifting slide block and a working roll baffle after being installed in the rolling mill, the roll shifting slide block is connected with one end of a working roll hydraulic cylinder, and the other end of the working roll hydraulic cylinder is connected on a mill housing. During hot rolling production, the phenomenon of burning of the working roll bearing (burning of the working roll bearing: generally, the phenomenon that the bearing roller in the working roll bearing box is clamped and does not rotate and the bearing is burnt and damaged) often occurs. Through internet search, combined with on-site production experience, the bearing of the bearing box of the working roll is burnt and damaged, and is mainly related to two factors of quality problems and external interference in the bearing box body, and about 80 percent of the burning and damage of the bearing caused by bearing of axial force due to the existence of the axial force in a rolling mill.

Aiming at the problem of axial force of a rolling mill, steel factories such as first steel, Bao steel and the like generally control the axial force by means of regularly checking and recovering the window size of a housing of the rolling mill, ensuring the rolling levelness and the like. However, in the production process, the production line stops rolling due to the burning loss of the bearing box of the working roll, the working roll needs to be replaced, and the dimensional precision of the rolling mill needs to be checked and restored, so that the production efficiency is greatly influenced, and the large loss is brought to a steel mill.

Disclosure of Invention

The invention aims to solve the technical problem of providing a method for monitoring the axial force of a working roll on line, which can dynamically monitor the axial force of a rolling mill in real time, avoid burning loss of a bearing box, really prevent accidents in advance and effectively reduce accidents.

In order to achieve the purpose, the invention adopts the following technical scheme:

a method for judging the axial force of a rolling working roll specifically comprises the following operations:

1) an oil pressure sensor is additionally arranged on a rod hydraulic pipeline of the working roll shifting cylinder and is connected with a rod cavity hydraulic pipeline of the working roll shifting cylinder, so that the pressure of the rod cavity pipeline of the working roll hydraulic cylinder is detected in real time;

2) the signal of the oil pressure sensor is processed by a data recorder of a main control computer, and is drawn into an oil pressure curve chart for visual display;

3) setting an oil pressure warning alarm value on a main control machine, and popping up an alarm prompt to prompt an operator to pay attention when the oil pressure reaches a preset alarm pressure in the rolling process;

4) the maximum value of the oil pressure of the roll shifting cylinder of each working roll of the rolling mill in a period is summarized by recording the oil pressure curve of the rod side of the roll shifting, the maximum value of the oil pressure occurring in the period is increased by 10 percent to be used as an oil pressure warning alarm value of the rolling mill, and an operator arranges the inspection or repair work of the bearing box of the working roll according to the alarm prompt.

Compared with the prior art, the invention has the beneficial effects that:

the invention dynamically monitors the axial force of the working roll of the rolling mill in real time, effectively monitors the axial bearing condition of the bearing of the working roll in the rolling process, can provide historical record query of the axial force, plays a role in prompting the inspection and repair of the bearing box, avoids the burning loss of the bearing box and really achieves the advance prevention of the control of accidents. Effectively reduces the accident occurrence and economic loss of the accident time, and improves the benefit of enterprises. In addition, the states of the mechanical and horizontal precision of the rolling mill can be reflected, and a favorable basis is provided for recovering the precision, the horizontal precision and the like of mechanical equipment.

Drawings

FIG. 1 is a schematic view of a work roll hydraulic system of the present invention.

FIG. 2 is a rolling force curve and a same-time oil pressure curve of a first finishing mill of the 1580 hot rolling line for rolling an SPHC 2.75X 1250mm plate.

In the figure: 1-adding an oil pressure sensor at the rod side of the upper working roll shifting and 2-adding an oil pressure sensor at the rod side of the lower working roll shifting.

Detailed Description

The following further describes embodiments of the present invention with reference to the accompanying drawings:

example (b):

1580 method for judging axial force of rolling working roll in thermal production line:

1) as shown in fig. 1, an oil pressure sensor (model number is HDA3B40-A-350-124) is additionally arranged on a hydraulic pipeline of a working roll shifting cylinder of each rolling mill, and is connected with a rod cavity hydraulic pipeline of the working roll shifting cylinder to detect the pressure of the rod cavity pipeline of the working roll hydraulic cylinder in real time;

2) signals of oil pressure sensors of the seven rolling mills are accessed to a data recorder of a main control computer, and are processed and drawn into an oil pressure curve chart for visual display;

3) setting an oil pressure warning alarm value (the 1580 hot rolling line is set to be 150bar) on a main control machine, and popping up an alarm prompt to prompt an operator to pay attention when the oil pressure reaches a preset alarm pressure in the rolling process;

4) the method comprises the steps of recording an oil pressure curve of a rod side of a shifting roller, summarizing the maximum value of the oil pressure of a shifting roller cylinder of each working roller of the rolling mill in a period of time, increasing the maximum value of the oil pressure in the period of time by 10% to serve as an oil pressure warning alarm value of the rolling mill, presetting the early warning values of the rolling mills respectively when the early warning values of the rolling mills in different frames are affected by the mechanical precision of the rolling mill, and arranging the checking or repairing work of a bearing box of the working roller by an operator according to the alarm prompt.

Through analyzing the oil pressure curve, the bearing condition of the working roll bearing is quantitatively analyzed, the burning loss of a bearing box is avoided, and the accident is really prevented in advance.

The foregoing is considered as illustrative only of the principles of the invention and is not to be in any way limiting, since all equivalent changes and modifications are intended to be included within the scope of the appended claims.

Claims

1. The utility model provides a rolling working roll axial force judgement method, its characterized in that, through carrying out the analysis to the oil pressure curve, to the bearing condition quantitative analysis of working roll bearing, on-line monitoring working roll axial force, real time dynamic monitoring rolling mill working roll axial force, the control is at rolling in-process working roll bearing axial bearing condition, provides the historical record inquiry of axial force, to the suggestion of bearing box inspection restoration, avoids the bearing box scaling loss, accomplishes the prevention in advance to the accident, and concrete operation is as follows:

1) an oil pressure sensor is additionally arranged on a hydraulic pipeline of a working roller shifting cylinder of each rolling mill, the model is HDA3B40-A-350-124, and the oil pressure sensor is connected with a hydraulic pipeline with a rod cavity of the working roller shifting cylinder to detect the pressure of the pipeline with the rod cavity of the working roller hydraulic cylinder in real time;

3) setting an oil pressure warning alarm value on a main control machine, setting a 1580 hot rolling line to be 150bar, and popping up an alarm prompt to prompt an operator to pay attention when the oil pressure reaches a preset alarm pressure in the rolling process;