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A continuous casting dummy bar positioning detection system and method

A technology of positioning detection and dummy rod, which is applied in the field of continuous casting dummy rod positioning detection system, can solve the problems of easy dirt, discoloration and damage, low stability of positioning tracking accuracy, large cumulative error, etc., to improve operating efficiency and Safety and reliability, ensuring the accuracy of automatic tracking and positioning control, and reducing the effect of impact and loss

Active Publication Date: 2021-10-22
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Affected by factors such as out-of-synchronization, pause, and slippage of the roller table and pinch roller group during long-distance transportation, as well as the wear of the roller surface, the joint clearance of the dummy bar, etc., the system often produces a relatively large error during the tracking process of the dummy bar position. large cumulative error
Therefore, the stability of the existing positioning and tracking accuracy is not high, and the error can reach several meters when it is serious. Such errors often cause the following problems:
[0004] 1) The pinch roller is pressed down prematurely before the head of the dummy bar arrives, resulting in collision damage between the pinch roller and the dummy bar;
[0005] 2) The dummy rod stops prematurely before reaching the crystallizer, which increases manual intervention and affects production efficiency;
[0006] 3) Cause the dummy rod to be sent over the head, increasing the risk of damage to the inner wall of the copper tube of the crystallizer
Since the device needs to add a mark on the dummy rod, the mark is subjected to high temperature, water vapor, vibration and other harsh environments together with the dummy rod, which is easy to be dirty, discolored and damaged, and needs to be replaced or maintained frequently The measurement device is not easy to identify, and the problem of missed measurement and false measurement will still occur
[0010] It can be seen that the prior art does not solve the problem of large cumulative errors in the process of tracking the position of the dummy bar, the stability of the positioning tracking accuracy is not high, and the maintenance of the equipment is inconvenient and the maintenance cost is high

Method used

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  • A continuous casting dummy bar positioning detection system and method
  • A continuous casting dummy bar positioning detection system and method
  • A continuous casting dummy bar positioning detection system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0060] As an embodiment of the present invention, the recognition processing of the head and tail of the dummy bar by the image processing unit includes the following steps:

[0061] Step 5.1) Real-time sampling extracts the gray value of each pixel in each stream target recognition window, and calculates the image gray value average value R in each stream target recognition window Av .

[0062] Step 5.2) After the dummy rod head reaches and covers the light spot, the light spot image in the target recognition window disappears, and the average gray level of the image in the window changes from the bright target threshold to the dark target threshold within the preset time period ΔT, and the image The processing unit automatically sends a signal that the dummy rod head is in place to the position calibration module.

[0063] Step 5.3) After the tail of the dummy rod leaves the light spot, the image of the light spot in the target recognition window is restored, and the averag...

Embodiment 1

[0075] In this embodiment, the method of the present invention is applied to a four-strand bloom continuous casting machine, and the cross-section of the billet of the continuous casting machine is 320*425 mm. Combine below Figure 1-6 , to further illustrate the embodiments of the present invention.

[0076] Such as figure 1 As shown, the continuous casting dummy bar position detection system in this embodiment includes a position monitoring unit 1 , and is characterized in that it also includes a laser projection unit 2 , an image detection unit 3 , and an image processing unit 4 . The position monitoring unit 1 includes a displacement detection module 1.1, a position tracking module 1.2, and a position calibration module 1.3. Displacement detection module 1.1 Read the motor speed feedback value from the conveyor roller motor inverter, or read the pulse count value from the conveyor roller motor encoder, calculate the rotation displacement increment of the conveyor roller ...

Embodiment 2

[0087] Such as figure 2 As shown, the continuous casting dummy bar positioning detection method of the present invention comprises the following steps:

[0088] Step 1: When the dummy bar starts to be sent up, the position tracking module sends an instruction to track the position of the upper dummy bar, and initializes the position of the dummy bar, and sets the coordinate value L of the dummy bar db Set to the initial value L of the recovery bit int , and L db = L int .

[0089] In this example, the coordinate position of the dummy bar is represented by the coordinate position of the dummy bar head by default, the coordinate zero position of the dummy bar is set at the top surface of the crystallizer, and the coordinate initial value L of the dummy bar at the recovery position int If it is set to 42000mm, it means that the distance between the dummy head at the recovery position and the top surface of the crystallizer is 42000mm.

[0090] Step 2: During the conveying p...

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Abstract

The invention discloses a continuous casting dummy bar positioning detection system and method. The system includes a position monitoring unit, a laser projection unit, an image detection unit, and an image processing unit. The position monitoring unit calculates the rotational displacement increment of the conveying roller in each sampling period, and accumulates the displacement increment to continuously track and calibrate the coordinate position of the dummy rod. The laser projection unit projects the positioning-assisted laser onto the dummy bar and reflects it to the image detection unit. The image detection unit detects the image formed by the laser, processes the image and forms digital image information. The image processing unit receives the digitized image information from the image detection unit, analyzes and processes the digitized image information according to the coordinate position of the position monitoring unit, and sends a signal of the head and tail of the dummy bar to the position monitoring unit. The invention can realize the automatic calibration of the dummy bar positioning detection error of the multi-stream continuous casting machine, and has the advantages of high precision, stability and reliability, maintenance-free and low cost.

Description

technical field [0001] The invention relates to a detection system and a detection method in steelmaking equipment, more specifically, to a continuous casting dummy bar positioning detection system and method. Background technique [0002] In the steelmaking and continuous casting production line, the dummy rod is a steel multi-section chain rod with a length of more than 20 meters. Pull the nascent slab shell out of the crystallizer when pouring, and complete the casting and traction of the steel billet. For the billet and round billet continuous casting machines that adopt the bottom loading dummy bar conveying system, the dummy bar usually needs to be driven by the relay of the roller table and the pinch roller set of the tension leveling machine, and is conveyed through tens of meters. , to reach the lower mouth of the crystallizer. The position tracking accuracy of the dummy bar has an important influence on the safety and stability of continuous casting production. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/18
CPCB22D11/18
Inventor 金国平余军夏春荣
Owner BAOSHAN IRON & STEEL CO LTD