The basic structure and control principle of the h

The basic structure and control principle of calenser coiler

1 Introduction

nowadays, many large domestic steel mills have adopted continuous cold rolling production lines. In order to realize the continuous production of strip steel, two uncoilers are required in the inlet section, and the tail of the strip and the head of the next coil of strip steel are welded by a welding machine to realize continuous rolling. Therefore, two coilers are also required in the outlet section. With the continuous progress of science and technology, the karensay coiler was born to meet the transportation. It has two mandrel, which can rotate randomly. Compared with the traditional coiler, it has the following advantages: first, the equipment layout is compact and reasonable, saving installation space; second, the operation is simple and convenient, which is more conducive to continuous and smooth coiling of strip steel. For example, the basic composition of the export section of the cold rolling production line of Handan Iron and Steel Co., Ltd. with 500 kg or more is: roller shear with clamping roll device, plate and belt steering device, and kalensay coiler with belt coiler and coil car. When the coiler reaches the preset coil size, the exit speed of the tandem mill will be reduced to about 250m/min, the pinch roll will be closed, the strip will be cut off by the drum, and the plate head of the next coil will be introduced to another mandrel of the coiler

2 working principle of the kalinsay coiler

basic composition of the kalinsay coiler: rotary table, two mandrel and its transmission device, As shown in Figure 1 and Figure 2:

in Figure 1:

1,2 --- No. 1 and No. 2 mandrel 3 --- turntable 4,5 --- proximity switch 6 --- No. 1 locking block 7 --- No. 2 locking block

in Figure 2:

1,2 --- No. 1 and No. 2 mandrel 3 --- hollow output shaft 4 --- rotor gear unit 5 --- distribution gear unit 6,7 --- No. 1 and No. 2 Band Brakes 8,9 --- No. 1 and No. 2 motors

when the turntable needs to rotate.First, open the No. 1 locking block, rotate the rotary table to 10 degrees, and release the No. 2 locking block, Rotate the rotary table for another 30 degrees, close the No. 1 locking block, rotate the rotary table for another 180 degrees, and close the No. 2 locking block. According to the conditions of the two proximity switches, the position of No. 1 and No. 2 mandrel on the coiler can be determined and displayed on the console and the screen

the mandrel is installed on the hollow output shaft of the rotor gear unit, and a distribution gear unit is installed in front of the rotor gear unit. The two rotor gear liquid crystal pendulum impact testing machines use the same standard device design, which is connected by two concentric drive shafts, and the drive shaft is hollow design. The shafts connected with the outer tube and inserted into the inner layer drive the 1#, 2# mandrel respectively

3 peripheral equipment

includes two runner and its transmission device, stripper, pressing roller, outrigger support, and belt winder

3.1 runner and its transmission device: rotate the coiler turntable, one is the main transmission, the other is the slave transmission

3.2 stripper: it plays an assisting role when it is difficult for the coil car to unload the coil

used to press the outer ring of rolled steel coil. At present, BASF is discussing with ofo a new strategic cooperation area between the upper roll and the lower roll of the press roll to ensure that the lead is firm. After the mandrel shrinks and the steel coil is held by the steel coil car, the pressure roller is lifted

3.3 hold down roll: installed next to the kalensay coiler. Used to press the outer ring of rolled steel coil. The pressing roll presses the rolled steel coil at the final deceleration stage, that is, the head is positioned between the upper roll and the lower roll of the pressing roll to ensure that the head is firm. After the mandrel shrinks and the steel coil is held by the steel coil car, the pressure roller is lifted

3.4 outstretched support, installed on the operating side of the kalensay coiler

support the free end of the mandrel of the coiler during rolling to reduce the sag of the mandrel. The outrigger support is driven by a hydraulic cylinder

3.5 belt winder

swing belt winder is installed on the karensay coiler for the first few rounds of strip steel coiling. The belt winder is equipped with a hydraulically driven belt tensioner. When the coiler rolls for 2-3 turns and the strip tension is established, the belt coiler returns to its initial position, and the tandem mill accelerates to the required rolling speed

4. Process flow:

the automatic start command of the coiler comes from the line coordination command of the production line or the operation console button

the action steps are summarized as follows: threading to mandrel 1 --- rotary table rotation --- mandrel 1 to coiling position for coiling --- mandrel 2 threading --- mandrel 1 unwinding --- rotary table rotation 180 degrees --- mandrel 2 to coiling position for coiling --- mandrel 2 unwinding --- rotary table rotation 180 degrees --- threading to mandrel 1 to complete a cycle. The detailed steps are as follows:

system configuration: automatically draw the stress time or relaxation rate time curve

for the control of the karensay coiler, PLC and TDC are used for common control, PLC is used for logic control, and TDC is used to control the motor drive of the mandrel

tdc is process drive control, which is used for medium and high speed closed-loop control and synchronization. TDC is a multiprocessor automation system, which is good at handling complex drive, control and communication tasks. It has the largest number of frameworks and the shortest cycle on a single platform. It is a process and drive automation system integrated in SIMATIC. Its configuration and transformation can also be carried out using SIMATIC tools, so it is also a part of the concept of fully integrated automation

the basic hardware structure of TDC is similar to that of PLC, including rack, microprocessor and communication board, but the response speed of rack and its plug-in module board are relatively fast, and the models used are also different

there are three types of communication templates in the TDC framework, which are respectively provided to PROFIBUS for use by Taihe GDM. The full name of GDM is global data memory, and the transmission rate can reach 640m baud rate. It is the central component of SIMATIC TDC automatic control system, which enables high-speed communication between various TDC functional units

5. System function and control features:

5.1 perfect process control:

manual mode: there are corresponding buttons on the console, and the operator can manually control the action of the coiler

automatic mode: the command is given by the line coordination program of the production line, and the coiler is programmed according to