Continuous steel charging method for heat treatment furnace

Abstract

The invention relates to the technical field of ferrous metallurgy, in particular to a continuous steel charging method for a heat treatment furnace, which comprises the following steps of: firstly, providing a programmable logic controller (PLC), the heat treatment furnace, a roller way and a grating sensor which are electrically connected with the PLC; at least two steel plates are sequentially arranged on the roller way in the conveying direction of the roller way to form a conveying unit, and a preset interval L is formed between every two adjacent steel plates; the roller way is controlled to convey the steel plate at the preset speed V, the grating shielding time T of the grating sensor is set to correspond to each preset interval L, and the preset interval L is smaller than or equal to V * T. According to the invention, a plurality of steel plates with preset intervals form an integral conveying unit, so that continuous steel loading of variety steel plates with small piece weight and small length in a heat treatment furnace is realized, the downtime is reduced, the equipment utilization rate is improved, and the production efficiency and the productivity are improved.

Description

Technical Field

[0001] The invention relates to the technical field of iron and steel metallurgy, and in particular to a method for continuously charging steel into a heat treatment furnace. Background Art

[0002] In recent years, the demand for steel has continued to increase, and the traditional production model has been unable to meet the demand. Taking the heat treatment production line as an example, it mainly produces thin and narrow steel plates. In the heat treatment normalizing, quenching and tempering production process, for some types of steel plates with small unit weight and short length, the production of a single steel plate into the furnace leads to frequent opening and closing of the normalizing furnace door and frequent frequency increase of the quenching machine, which leads to an increase in energy consumption such as coal gas, nitrogen, and water, and limited production efficiency.

[0003] Based on this, the present invention provides a method for continuously charging steel into a heat treatment furnace. Summary of the invention

[0004] In view of the above-mentioned technical problems, the present invention overcomes the shortcomings of the prior art and provides a method for continuously charging steel in a heat treatment furnace, thereby realizing continuous charging of steel plates of small unit weight and short length in a heat treatment furnace, reducing downtime, improving equipment utilization, and enhancing production efficiency and capacity.

[0005] The present invention provides a method for continuously charging steel into a heat treatment furnace, comprising the following steps: A programmable logic controller (PLC), a heat treatment furnace, a roller table and a grating sensor are provided, wherein the heat treatment furnace, the roller table and the grating sensor are all electrically connected to the programmable logic controller (PLC), and the heat treatment furnace, the roller table and the grating sensor are centrally controlled by the PLC to realize automatic coordinated control; Placing at least two steel plates on the roller conveyor in sequence along the conveying direction of the roller conveyor to form a conveying unit, with a preset interval L between adjacent steel plates; The programmable logic controller PLC controls the roller to transport the steel plate at a preset speed V, driving the steel plate into the heat treatment furnace, and sets the grating shielding time T of the grating sensor to correspond to each preset interval L, wherein the preset interval L≤V*T; in the traditional mode, when the steel plate gap passes through, the grating will misjudge that there is no steel plate and trigger a shutdown signal. By setting an appropriate grating shielding time T, it can be ensured that the system maintains a normal operating state when the expected preset interval L of adjacent steel plates passes, thereby avoiding erroneous shutdown of the heat treatment furnace door and roller.

[0006] Furthermore, when the grating sensor detects that the steel plate arrives at the mouth of the heat treatment furnace, the programmable logic controller PLC controls the door of the heat treatment furnace to open and controls the roller to operate; when the grating sensor does not detect the steel plate, the programmable logic controller PLC controls the door of the heat treatment furnace to close and controls the roller to stop.

[0007] Furthermore, the conveying unit includes two steel plates with a preset interval L of 500 mm, and the grating shielding time T is 5 seconds.

[0008] Furthermore, the steel plate is placed on a roller conveyor by crane.

[0009] The beneficial effects of the present invention are: The present invention provides a method for continuously charging a heat treatment furnace with steel, which can form a plurality of steel plates with preset intervals into an integral conveying unit, thereby realizing continuous charging of steel plates with small unit weight and short length in the heat treatment furnace, reducing downtime, improving equipment utilization, and enhancing production efficiency and capacity; correspondingly, the present invention can also reduce the frequency of opening and closing the furnace door, reduce heat loss and energy consumption, improve energy utilization efficiency, and realize a technical breakthrough in the continuous charging of the heat treatment furnace with steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of continuous steel loading in the method of an embodiment of the present invention; In the figure: 100, conveying unit; 101, first steel plate; 102, second steel plate; 200, heat treatment furnace; 300, roller table. DETAILED DESCRIPTION

[0011] The method for continuously charging steel into a heat treatment furnace provided in this embodiment is as follows: Figure 1 As shown, the specific steps include: S1. Providing a programmable logic controller PLC, a heat treatment furnace 200, a roller 300 and a grating sensor, wherein the heat treatment furnace 200, the roller 300 and the grating sensor are electrically connected to the programmable logic controller PLC; S2. After the steel plates are shot blasted, they need to be placed in the cargo space. The two-end placement rule is implemented. At least two steel plates are sequentially placed on the roller conveyor 300 by crane along the conveying direction of the roller conveyor 300 to form a conveying unit 100. There is a preset interval L between adjacent steel plates. S3. The programmable logic controller PLC controls the roller 300 to transport the steel plate at a preset speed V, driving the steel plate into the heat treatment furnace 200, and sets the grating shielding time T of the grating sensor to correspond to each preset interval L, wherein the preset interval L≤V*T.

[0012] Specifically in this embodiment, each conveying unit 100 uses two steel plates with a preset interval L of 500 mm, namely the first steel plate 101 and the second steel plate 102. When the grating sensor detects that the steel plate arrives at the furnace mouth of the heat treatment furnace 200, the programmable logic controller PLC controls the furnace door of the heat treatment furnace 200 to open and controls the roller conveyor 300 to operate; when the grating sensor does not detect the steel plate, the programmable logic controller PLC controls the furnace door of the heat treatment furnace 200 to close and controls the roller conveyor 300 to stop.

[0013] It can be understood that in some other embodiments, the preset interval L can also be less than 500mm. This embodiment takes the grating shielding time T of 5 seconds as an example, and designs a continuous steel loading mode in the programmable logic controller PLC. The grating adopts the shielding mode with a shielding time of 5 seconds. This can prevent the grating from automatically stopping when there is no occupancy, so as to avoid the roller table from not rotating, resulting in abnormal length measurement and inability to enter the furnace, or failure to detect the occupancy signal, resulting in the furnace door accidentally falling when steel is discharged, causing damage to the equipment. The method for continuous steel loading of the heat treatment furnace provided in this embodiment improves production efficiency, increases production capacity by 12%, reduces the frequency of opening and closing of the furnace door, reduces nitrogen consumption and heat loss in the furnace, thereby reducing gas consumption, and also reduces the number of times the quenching machine is upgraded, and reduces quenching water consumption.

[0014] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims

1. A method for continuously charging steel in a heat treatment furnace, characterized in that: The following steps are involved: A programmable logic controller (PLC), a heat treatment furnace (200), a roller table (300), and a grating sensor are provided, wherein the heat treatment furnace (200), the roller table (300), and the grating sensor are all electrically connected to the programmable logic controller (PLC); At least two steel plates are sequentially placed on the roller conveyor (300) along the conveying direction of the roller conveyor (300) to form a conveying unit (100), with a preset interval L between adjacent steel plates; The programmable logic controller (PLC) controls the roller (300) to transport the steel plate at a preset speed V, driving the steel plate into the heat treatment furnace (200), and sets the grating shielding time T of the grating sensor to correspond to each preset interval L, wherein the preset interval L≤V*T.

2. The method according to claim 1, characterized in that When the grating sensor detects that the steel plate has arrived at the furnace mouth of the heat treatment furnace (200), the programmable logic controller (PLC) controls the furnace door of the heat treatment furnace (200) to open and controls the roller conveyor (300) to operate; when the grating sensor does not detect the steel plate, the programmable logic controller (PLC) controls the furnace door of the heat treatment furnace (200) to close and controls the roller conveyor (300) to stop.

3. The method according to claim 1, characterized in that The conveying unit (100) comprises two steel plates with a preset interval L of 500 mm, and the grating shielding time T is 5 seconds.

4. The method according to claim 1, characterized in that: The steel plate is hoisted by a crane and placed on a roller conveyor (300).

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