CN109719139B

CN109719139B - Automatic control system for wall thickness of end part of seamless steel pipe

Info

Publication number: CN109719139B
Application number: CN201910109990.5A
Authority: CN
Inventors: 国庆稳; 李金龙; 顾波; 梁凤龙; 张晓峰; 杜红亮
Original assignee: Heilongjiang Jianlong Iron and Steel Co Ltd
Current assignee: Heilongjiang Jianlong Iron and Steel Co Ltd
Priority date: 2019-02-11
Filing date: 2019-02-11
Publication date: 2020-07-28
Anticipated expiration: 2039-02-11
Also published as: CN109719139A

Abstract

The invention belongs to the technical field of steel production equipment, and particularly relates to an automatic control system for the wall thickness of an end part of a seamless steel pipe, which comprises a DP/DP COUP L ER module for data transmission between a heavy-end control CPU and a stretch reducer control CPU, an upper computer for data monitoring and parameter input, an exchanger for Ethernet data transmission, a laser velocimeter for field steel pipe speed measurement and a P L C control system, wherein the P L C comprises a PS407 power supply, a 416-2D signal processing module, a CP443-5DP network module for network DP data transmission, a CP443-1 Ethernet module for Ethernet data transmission, an FM450 high-number counting module for laser speed measurement data reading and an SM421 signal module for digital quantity signal reading.

Description

Automatic control system for wall thickness of end part of seamless steel pipe

Technical Field

The invention belongs to the technical field of steel production equipment, and particularly relates to an automatic control system for the wall thickness of an end part of a seamless steel pipe.

Background

The head and the tail end of the seamless steel pipe can be thickened in the rolling process of the main rolling mill and the stretch reducer, so that the thickness of the inner wall of the tail end of the steel pipe head is unqualified within the range of 2 meters, the unqualified parts of the head and the tail (end parts) are cut off at a pipe gang saw, a large amount of waste products can be generated, and the yield of the steel pipe is greatly reduced. Although some people study the control system abroad, the control system has poor use effect, often has faults and is complex to control, and the quality of products is influenced when the faults occur, so that unqualified products are produced. The amount of waste products is increased, so that a set of automatic control system for the pipe end wall thickness, which is simple to operate, safe and reliable, needs to be designed.

Disclosure of Invention

The invention aims to provide an automatic control system for the wall thickness of the end part of a seamless steel pipe, which solves the problem of thickening of the wall thickness of the end part of the seamless steel pipe in the rolling process, reduces the cutting amount of the end part of the seamless steel pipe and improves the yield of the seamless steel pipe.

The technical scheme includes that the automatic control system (double-head control for short) for the wall thickness of the end portion of the seamless steel pipe comprises a DP/DPCOUP L ER module for carrying out data transmission between a double-head control CPU and a stretch reducer control CPU, an upper computer for carrying out data monitoring and parameter input, an exchanger for carrying out Ethernet data transmission, a laser velocimeter for carrying out on-site steel pipe velocity measurement and a P L C control system, the P L C control system comprises a P L CPS power supply for supplying power to the P L C module, a CPU416-2DP module for signal processing, a CP443-5DP network module for carrying out DP network data transmission, a CP443-1 Ethernet network module for carrying out Ethernet data transmission, an FM450 high-number counting module for carrying out laser velocity measurement data reading and an SM421 signal module for carrying out UP digital signal reading, the laser velocimeter transmits data with the P L C control system through a wire, the exchanger transmits the data with the P L C control system, the upper computer and the laser velocimeter through the UP 35C control system, and the DP L control system transmits the data through the P35DP L C control system.

Furthermore, the automatic control system for the wall thickness of the pipe end of the seamless steel pipe comprises a power supply of Siemens S7-400, a CPU, a transmission network, signals, an Ethernet and a high-speed counter module, a P L C control system is used for processing the signals transmitted back by a laser velocimeter to realize the positioning and tracking of the end of the seamless steel pipe, parameters input by an upper computer are processed by P L C, the speed parameters of a motor are transmitted to a stretch reducer P L C by a DP/DP COUP L ER module, the rotating speed of a roll of the stretch reducer acting on the end of the steel pipe is controlled, and the control of the wall thickness of the end of the seamless steel pipe is realized

The automatic control system for the wall thickness of the end part of the seamless steel tube has the advantages that the automatic control system for the wall thickness of the end part of the seamless steel tube is provided, the problem of thickening of the wall thickness of the end part of the seamless steel tube in the rolling process is solved, the end part cutting amount of the seamless steel tube is reduced, and the yield of the seamless steel tube is improved.

Description of the drawings:

FIG. 1 is a network diagram of the wall thickness control of the end of a steel pipe according to one embodiment;

FIG. 2 is a flowchart of the P L C program framework in the first embodiment.

The specific implementation mode is as follows:

example one

Referring to the figures, the automatic control system for the wall thickness of the end part of the seamless steel tube comprises a DP/DP COUP L ER module for data transmission between a heavy head control CPU and a stretch reducer control CPU, an upper computer for data monitoring and parameter input, an exchanger for Ethernet data transmission, a laser velocimeter for field steel tube speed measurement and a P L C control system, wherein the P L C control system comprises a P L C PS407 power supply for supplying power to the P L C module, a CPU416-2DP module for signal processing and program operation, a CP443-5DP network module for DP network data transmission, a CP443-1 Ethernet module for Ethernet data transmission, an FM450 high-number counting module for laser speed measurement data reading and an SM421 signal module for digital quantity signal reading, the laser velocimeter transmits data with the P L C control system through a lead, the exchanger transmits data with the P L C control system, the upper computer and the laser velocimeter through the Ethernet/DP L and the DP L C control system.

As shown in figure 1, a system hardware network is built, wires are distributed, and a hardware system of the control system is built, wherein the configuration comprises a Siemens P L C400 module power supply PS407, a CPU416-2DP, a DP network module CP443-5, an Ethernet module CP443-1 and a high-number counting module FM450, and the Siemens P L C module power supply, the CPU416-2DP, the DP network module CP443-5, the Ethernet module CP443-1 and the high-number counting module FM450 are connected with a stretch reducer body P L C system, an upper computer and a laser velocimeter through Ethernet, DP network and hard wires, data transmission between the two P L C modules realizes the roll speed control of the stretch reducer, the laser velocimeter realizes the steel tube tracking.

As shown in FIG. 2, the automatic control of the wall thickness of the whole seamless steel tube is realized by the P L C control program.

The tension reducing mill changes the tension by changing the roller speed of the frame to control the wall thickness of the finished pipe, the tension between frames is increased, the wall thickness is thinned, the tension between frames is decreased, the wall thickness is thickened, therefore, before the first frame of the tension reducing mill bites steel, the rotating speed of a main motor of a corresponding action frame is increased to increase the tension, after the steel is bitten, the rotating speed of the action frame is reduced to normal rolling speed according to the position of the head of the steel pipe between the frames, the head of the steel pipe is thinned, the middle part of the steel pipe is not affected, when the tail of the pipe reaches the action frame, the speed is reduced again to thin the tail of the pipe, the standby rotating speed before steel biting is recovered after the tail of the pipe passes through the action frame, the rotating speed adjustment is calculated in P L C according to the elongation rate required to be increased input by an upper computer, the number of the action frames, the number of the frame starting to act and the elongation rate required to be increased by the selected action frame, the advanced P L.

Example two

The method includes the steps of entering Wincc by a double-click computer desktop, clicking a seamless steel pipe end wall thickness control system after an item is opened, entering a start page, checking the total state of an automatic pipe end wall thickness control system through a click state option card, checking detailed parameters of a rack motor, checking real-time and historical rotating speed and torque data, setting various parameters through an operation page, inputting steel pipe specifications including steel type, outer diameter and wall thickness, inputting a working diameter of a roller, checking the change of the part immediately, calculating the change of the elongation rate of a pipe end according to the diameter of a newly input roller, recalculating the data of the linear speed and the rotating speed which should be compensated immediately and taking effect immediately, inputting the number of selected racks and the number of the selected racks, inputting 3-10, starting the conversion of the number of the selected racks, selecting 1-8 for the change of the part, checking the change of the working diameter of the roller immediately, and saving the number of the selected racks, and saving the number of the expansion rate of the selected racks, and saving the data when the expansion rate of the steel pipe end wall thickness is increased, the expansion rate of the steel pipe reaches a specified value, the corresponding expansion rate of a dialog box, and the expansion rate of the steel pipe, the expansion rate of the steel pipe, the expansion rate of the steel pipe end wall thickness, the steel pipe, the expansion rate of the expansion rate, the expansion rate of the steel pipe, the expansion rate of the steel pipe, the expansion rate of the expansion rate, the expansion rate of the steel pipe, the expansion rate of the expansion rate, the expansion rate of the expansion rate, the expansion rate of the expansion rate, the expansion rate of the expansion rate, the expansion rate of the expansion rate, the expansion.

Claims

1. An automatic control system for wall thickness of an end of a seamless steel pipe is characterized by comprising a DP/DP COUP L ER module for transmitting data between a heavy head control CPU and a stretch reducer control CPU, an upper computer for monitoring data and inputting parameters, an exchanger for transmitting Ethernet data, a laser velocimeter for measuring the speed of the steel pipe on site and a P L C control system, wherein the P L C control system comprises a PS407 power supply for supplying power to the P L C module, a 416-2D module for signal processing, a CP443-5DP network module for transmitting DP network data, a CP443-1 Ethernet module for transmitting Ethernet data, an FM450 high-number counting module for reading laser speed measurement data and an SM421 signal module for reading digital quantity signals, the laser velocimeter transmits data with the P L C control system through a lead, the exchanger transmits data with the P L C control system, the upper computer and the laser velocimeter through an Ethernet and the P L C control system, and the ER/DP L transmits data with the P L control system through the DP.