Accurate positioning method for blank at feeding side of heating furnace

Abstract

The invention belongs to the technical field of steel rolling automatic control, and relates to a precise positioning method for a blank on the feeding side of a heating furnace, a feeding roller way carries a slab blank at an initial speed V1 to move along a material advancing direction, and when a metal detector detects the slab blank, the positioning direction is judged according to a positioning instruction issued by an L2-level computer; if non-rolling-side positioning is judged, the first laser range finder starts to record a numerical value, and the running speed of the in-furnace roller way is adjusted to be a set speed V2; if it is judged that the rolling side is positioned, a second laser range finder starts to record the numerical value, and the furnace entering roller way runs at the initial speed V1 for t seconds and then is adjusted to the set speed V2; when the numerical value detected by the first laser range finder or the second laser range finder changes suddenly, the running speed of the furnace entering roller way is reduced to 0 m / s, and positioning is completed. The method is more flexible in judgment condition, simple and convenient to install and use, easy to debug and capable of rapidly achieving rapid and accurate positioning of the blank entering the heating furnace, and the positioning accuracy is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of automatic control of steel rolling, and particularly relates to a precise positioning method for billets on the furnace inlet side of a heating furnace. Background Art

[0002] In steel rolling production, billets of different specifications are usually distributed in the furnace chamber in two ways: non-rolling side positioning and rolling side positioning. In current positioning methods, a metal detector and a speed feedback of a control furnace inlet roller table motor frequency converter are generally used to calculate the billet position cooperatively. There are often phenomena where the actual position of the billet does not match the calculated position, resulting in a risk of rubbing of the equipment in the furnace.

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

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

[0005] The technical solution adopted by the present invention to solve its technical problems is: a precise positioning method for billets on the furnace inlet side of a heating furnace, including the following steps:

[0006] (1) The furnace inlet roller table transports the slab billet along the material traveling direction at an initial speed V1. When the metal detector detects the slab billet, the positioning direction is judged according to the positioning instruction issued by the L2-level computer.

[0007] (2) If it is judged as non-rolling side positioning, the first laser rangefinder starts to record the value, and the running speed of the furnace inlet roller table is adjusted to the set speed V2.

[0008] (3) If it is judged as rolling side positioning, the second laser rangefinder starts to record the value, and after the furnace inlet roller table runs at the initial speed V1 for t seconds, it is adjusted to the set speed V2.

[0009] (4) When the detected value of the first laser rangefinder or the second laser rangefinder changes suddenly, the running speed of the furnace inlet roller table drops to 0 m / s, and the positioning is completed.

[0010] Further, the furnace inlet roller table is arranged on the furnace inlet 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 inlet roller table along the material traveling direction.

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

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

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

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

[0015] The present invention has the following beneficial effects: The present invention completes the blank positioning through the mutation detection of the metal detector and the laser rangefinder. The judgment conditions are more flexible, the installation and use are simple and convenient, and it is easy to debug. It can quickly realize the rapid and accurate positioning of the blank entering the heating furnace, and improve the positioning accuracy. Description of the Drawings

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

[0017] Figure 2 is a precise positioning control flow chart of the blank on the furnace inlet side of the heating furnace of the present invention.

[0018] In the figure, 1, furnace inlet roller table; 2, slab blank; 3, first laser rangefinder; 4, metal detector; 5, second laser rangefinder; 6, heating furnace. Detailed Embodiments

[0019] The following are specific embodiments of the present invention, which further describe the technical solutions of the present invention, but the protection scope of the present invention is not limited to these embodiments. Any change or equivalent substitution that does not deviate from the concept of the present invention is included in the protection scope of the present invention.

[0020] As Figure 2 shown, a method for precise positioning of a blank on the furnace inlet side of a heating furnace includes the following steps:

[0021] (1) As Figure 1 shown, the furnace inlet roller table 1 is arranged on the furnace inlet side of the heating furnace 6. A first laser rangefinder 3, a metal detector 4, and a second laser rangefinder 5 are sequentially arranged on one side of the furnace inlet roller table 1 along the material traveling direction. The distance between the first laser rangefinder 3 and the second laser rangefinder 5 is S, and the metal detector 4 is arranged at the S / 2 position. The furnace inlet roller table 1 transports the slab blank 2 along the material traveling direction at an initial speed V1. When the metal detector 4 detects the slab blank 2, the positioning direction is judged according to the positioning instruction issued by the L2-level computer.

[0022] (2) If it is judged as non-rolling side positioning, the first laser rangefinder 3 starts to record the value, and the running speed of the furnace inlet roller table 1 is adjusted to the set speed V2, and V2 is equal to 0.1 - 0.3 times of the initial speed V1.

[0023] (3) If it is determined as side rolling positioning, the second laser rangefinder 5 starts to record values. After the furnace loading roller table 1 runs at the initial speed V1 for time t seconds, it is adjusted to the set speed V2, and the running time t is equal to 0.2 - 0.4 times of S / V1;

[0024] (4) When the detected value of the first laser rangefinder 3 or the second laser rangefinder 5 undergoes a sudden change, and the sudden change value is preferably greater than 2m, the running speed of the furnace loading roller table 1 drops to 0m / s, and the positioning is completed.

[0025] Example 1: Non-side rolling positioning

[0026] The furnace loading roller table 1 carries the slab billet 2 in the material advancing direction at the initial speed V1. When the metal detector 4 detects the slab billet 2, the first laser rangefinder 3 starts to record values, and the value is recorded as M1 at this time. At the same time, the running speed of the furnace loading roller table 1 is adjusted to the set speed V2; when the detected value of the first laser rangefinder 3 suddenly changes to M2, and M1 - M2 > 2m, the running speed of the furnace loading roller table 1 drops to 0m / s, and the positioning is completed.

[0027] Example 2: Side rolling positioning

[0028] The furnace loading roller table 1 carries the slab billet 2 in the material advancing direction at the initial speed V1. When the metal detector 4 detects the slab billet 2, the second laser rangefinder 5 starts to record values, and the value is recorded as M1 at this time. At the same time, the running speed of the furnace loading roller table 1 is adjusted to the set speed V2 after t (0.2 - 0.4 times of S / V1) seconds; when the detected value of the second laser rangefinder 5 suddenly changes to M2, and M2 - M1 > 2m, the running speed of the furnace loading roller table 1 drops to 0m / s, and the positioning is completed.

[0029] The present invention is not limited to the above embodiments. Anyone should know that structural changes made under the inspiration of the present invention, as long as they have the same or similar technical solutions as the present invention, all fall within the protection scope of the present invention.

[0030] The technologies, shapes, and structures not described in detail in the present invention are all well-known technologies.

Claims

1. A method for accurately positioning a blank at the inlet side of a heating furnace, characterized in that: The following steps are involved: (1) The furnace roller conveyor carries the slab billet at an initial speed V1 and runs along the material travel direction. When the metal detector detects the slab billet, the positioning direction is determined according to the positioning instruction issued by the L2-level computer; (2) If it is judged as non-rolling side positioning, the No. 1 laser rangefinder starts to record the value, and the running speed of the furnace roller is adjusted to the set speed V2; (3) If it is judged to be rolling side positioning, the second laser rangefinder starts to record the value, and the furnace roller runs at the initial speed V1 for t seconds and then adjusts to the set speed V2; (4) When the detection value of the No. 1 laser rangefinder or the No. 2 laser rangefinder changes suddenly, the running speed of the furnace roller table drops to 0m / s, and the positioning is completed.

2. The method for accurately positioning the blank at the inlet side of a heating furnace according to claim 1, characterized in that: The furnace entry roller is arranged at the furnace entry side of the heating furnace, and a No. 1 laser rangefinder, a metal detector, and a No. 2 laser rangefinder are arranged in sequence along the material travel direction on one side of the furnace entry roller.

3. The method for accurately positioning the blank at the inlet side of a heating furnace as claimed in claim 2, characterized in that: The distance between the No. 1 laser rangefinder and the No. 2 laser rangefinder is S, and the metal detector is set at the S / 2 position.

4. The method for accurately positioning the blank at the inlet side of a heating furnace as claimed in claim 1, characterized in that: The set speed V2 is equal to 0.1-0.3 times the initial speed V1.

5. The method for accurately positioning the blank at the inlet side of a heating furnace as claimed in claim 1, characterized in that: The running time t in step (3) is equal to 0.2-0.4 times S / V1.

6. The method for accurately positioning the blank at the inlet side of a heating furnace as claimed in claim 1, characterized in that: In the step (4), the mutation value of the No. 1 laser rangefinder or the No. 2 laser rangefinder is preferably greater than 2 m.

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