A method for precise positioning of billets on the furnace side of a heating furnace

Abstract

This invention belongs to the field of automatic control technology for steel rolling mills, and relates to a method for precise positioning of billets on the furnace feed side of a heating furnace. The feed roller conveyor carries the billet along the material travel direction at an initial speed V1. When a metal detector detects the billet, the positioning direction is determined according to a positioning command issued by an L2-level computer. If the positioning is determined to be non-rolling side, a first laser rangefinder begins recording values, and the feed roller conveyor speed is adjusted to a set speed V2. If the positioning is determined to be rolling side, a second laser rangefinder begins recording values, and the feed roller conveyor runs at the initial speed V1 for t seconds before adjusting to the set speed V2. When the values ​​detected by either the first or second laser rangefinder change abruptly, the feed roller conveyor speed drops to 0 m / s, and positioning is completed. This invention offers more flexible judgment conditions, is simple and convenient to install and use, and is easy to debug. It can quickly and accurately position the billet fed into the heating furnace, improving positioning accuracy.

Description

Technical Field

[0001] This invention belongs to the field of automatic control technology for steel rolling, and specifically relates to a method for precise positioning of billets on the furnace feed side of a heating furnace. Background Technology

[0002] In steel rolling production, billets of different specifications are usually placed in the furnace using two methods: non-rolling side positioning and rolling side positioning. The current positioning method generally uses metal detectors and speed feedback from the frequency converter of the roller conveyor to control the speed of the billet to calculate the position. This often results in discrepancies between the actual position of the billet and the calculated position, causing the risk of scraping against equipment inside the furnace.

[0003] Therefore, there is an urgent need for a method for precise positioning of billets on the furnace side of a heating furnace, which can accurately locate the position of the billets and avoid scratching the equipment inside the furnace. Summary of the Invention

[0004] The purpose of this invention is to provide a method for precise positioning of billets on the furnace side of a heating furnace, so as to achieve rapid and precise positioning of billets entering the furnace.

[0005] The technical solution adopted by this invention to solve its technical problem is: a method for accurately positioning billets on the furnace feed side of a heating furnace, comprising the following steps:

[0006] (1) The furnace roller conveyor carries the slab billet at an initial speed V1 along the material travel direction. When the metal detector detects the slab billet, the positioning direction is determined according to the positioning command issued by the L2 level computer.

[0007] (2) If it is determined to be non-rolling side positioning, the No. 1 laser rangefinder starts recording values, and the running speed of the furnace roller conveyor is adjusted to the set speed V2.

[0008] (3) If it is determined to be rolling side positioning, the No. 2 laser rangefinder starts recording values, and the furnace roller conveyor runs at the initial speed V1 for t seconds and then is adjusted to the set speed V2.

[0009] (4) When the value detected by the No. 1 laser rangefinder or the No. 2 laser rangefinder changes abruptly, the running speed of the furnace roller conveyor drops to 0m / s, and the positioning is completed.

[0010] Furthermore, the furnace feed roller conveyor is located on the furnace feed side of the heating furnace, and a first laser rangefinder, a metal detector, and a second laser rangefinder are sequentially arranged on one side of the furnace feed roller conveyor along the material travel direction.

[0011] Furthermore, the distance between the first laser rangefinder and the second laser rangefinder is S, and the metal detector is set at position S / 2.

[0012] Furthermore, the set speed V2 is equal to 0.1-0.3 times the initial speed V1.

[0013] Furthermore, in step (3), the running time t is equal to 0.2-0.4 times S / V1.

[0014] Furthermore, in step (4), the abrupt change value of the first or second laser rangefinder is preferably greater than 2m.

[0015] The present invention has the following beneficial effects: The present invention completes the billet positioning by using a metal detector and a laser rangefinder to detect sudden changes, which makes the judgment conditions more flexible, is simple and convenient to install and use, and is easy to debug. It can quickly and accurately position the billet entering the heating furnace, thus improving the positioning accuracy. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the furnace inlet side structure of the heating furnace of the present invention.

[0017] Figure 2 This is a flowchart of the precise positioning control process for the billet on the furnace side of the heating furnace according to the present invention.

[0018] In the diagram, 1 is the furnace feed roller conveyor, 2 is the slab billet, 3 is the No. 1 laser rangefinder, 4 is the metal detector, 5 is the No. 2 laser rangefinder, and 6 is the heating furnace. Detailed Implementation

[0019] The following are specific embodiments of the present invention, which further describe the technical solution of the present invention. However, the scope of protection of the present invention is not limited to these embodiments. All changes or equivalent substitutions that do not depart from the concept of the present invention are included within the scope of protection of the present invention.

[0020] like Figure 2 As shown, a method for accurately positioning billets on the furnace feed side of a heating furnace includes the following steps:

[0021] (1) As Figure 1 As shown, the furnace feed roller conveyor 1 is located on the furnace feed side of the heating furnace 6. A first laser rangefinder 3, a metal detector 4, and a second laser rangefinder 5 are sequentially arranged along the material travel direction on one side of the furnace feed roller conveyor 1. The distance between the first laser rangefinder 3 and the second laser rangefinder 5 is S. The metal detector 4 is located at position S / 2. The furnace feed roller conveyor 1 carries the slab billet 2 at an initial speed V1 along the material travel direction. When the metal detector 4 detects the slab billet 2, it determines the positioning direction according to the positioning command issued by the L2 level computer.

[0022] (2) If it is determined to be non-rolling side positioning, the No. 1 laser rangefinder 3 starts recording values, and the running speed of the furnace roller conveyor 1 is adjusted to the set speed V2, which is equal to 0.1-0.3 times the initial speed V1;

[0023] (3) If it is determined to be side-mounted positioning, the No. 2 laser rangefinder 5 starts to record the value, and the furnace roller conveyor 1 is adjusted to the set speed V2 after running at the initial speed V1 for t seconds. The running time t is equal to 0.2-0.4 times S / V1.

[0024] (4) When the value detected by the No. 1 laser rangefinder 3 or the No. 2 laser rangefinder 5 changes abruptly, the change value is preferably greater than 2m, the running speed of the furnace roller conveyor 1 drops to 0m / s, and the positioning is completed.

[0025] Example 1: Non-rolling side positioning

[0026] The furnace feed roller conveyor 1 carries the slab billet 2 along the material travel direction at an initial speed V1. When the metal detector 4 detects the slab billet 2, the first laser rangefinder 3 starts recording a value, which is recorded as M1. At the same time, the running speed of the furnace feed roller conveyor 1 is adjusted to the set speed V2. When the value detected by the first laser rangefinder 3 suddenly changes to M2, and M1-M2>2m, the running speed of the furnace feed roller conveyor 1 drops to 0m / s, and the positioning is completed.

[0027] Example 2 Rolling Side Positioning

[0028] The furnace feed roller conveyor 1 carries the slab billet 2 along the material travel direction at an initial speed of V1. When the metal detector 4 detects the slab billet 2, the second laser rangefinder 5 starts recording a value, which is recorded as M1. At the same time, the running speed of the furnace feed roller conveyor 1 is adjusted to the set speed V2 after t (0.2-0.4 times S / V1) seconds. When the value detected by the second laser rangefinder 5 suddenly changes to M2, and M2-M1>2m, the running speed of the furnace feed roller conveyor 1 drops to 0m / s, and the positioning is completed.

[0029] This invention is not limited to the above-described embodiments. Anyone should know that any structural changes made under the guidance of this invention, and any technical solutions that are the same as or similar to this invention, fall within the protection scope of this invention.

[0030] The technologies, shapes, and structures not described in detail in this invention are all known technologies.

Claims

1. A method for precise positioning of billets on the furnace feed side of a heating furnace, characterized in that, Includes the following steps: (1) The furnace roller conveyor carries the slab billet at an initial speed V1 along the material travel direction. When the metal detector detects the slab billet, the positioning direction is determined according to the positioning command issued by the L2 level computer. (2) If it is determined to be non-rolling side positioning, the No. 1 laser rangefinder starts recording values, and the running speed of the furnace roller conveyor is adjusted to the set speed V2; (3) If it is determined to be side-mounted, the No. 2 laser rangefinder starts recording values, and the furnace roller conveyor runs at the initial speed V1 for t seconds and then is adjusted to the set speed V2. (4) When the value detected by the No. 1 laser rangefinder or the No. 2 laser rangefinder changes abruptly, the running speed of the furnace roller conveyor drops to 0m / s, and the positioning is completed; The furnace feed roller conveyor is located on the furnace feed side of the heating furnace. A first laser rangefinder, a metal detector, and a second laser rangefinder are sequentially arranged on one side of the furnace feed roller conveyor along the material travel direction. The distance between the first laser rangefinder and the second laser rangefinder is S, and the metal detector is set at position S / 2. The set speed V2 is equal to 0.1-0.3 times the initial speed V1; In step (3), the running time t is equal to 0.2-0.4 times S / V1; In step (4), the abrupt change value of either laser rangefinder No. 1 or laser rangefinder No. 2 is greater than 2m.

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