Automatic ignition device for flame cutting of stainless steel continuous casting billet

Abstract

The utility model relates to the technical field of stainless steel continuous casting, in particular to an automatic ignition device for flame cutting of a stainless steel continuous casting billet, which comprises an ignition device, a control device and a cutting gun device. By means of the device, waste of oxygen and fuel gas in the cutting waiting period can be greatly reduced, energy consumption is reduced by about 30%-40%, the production cost is saved, accumulation of iron powder and cutting slag in the ignition device can be effectively reduced when stainless steel is cut, the ignition success rate is increased, and the service life of the ignition device is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of stainless steel continuous casting, in particular to an automatic ignition device for flame cutting of stainless steel continuous casting billets. Background Art

[0002] At present, stainless steel continuous casting machines use flame cutting machines to cut ingots. The method of using the device is: first adjust the preheating oxygen pressure reducing valve, gas pressure reducing valve, and cutting oxygen pressure reducing valve, adjust the gas, preheating oxygen, and cutting oxygen to the working pressure, and leave a bypass for the preheating oxygen and gas. During production, adjust the opening to the appropriate degree through the hand wheel or ball valve, and control it with the solenoid valve to ignite the cutting nozzle to make it burn (normal open flame) in preparation for cutting. When the ingot reaches the fixed length, the preheating oxygen solenoid valve and the gas solenoid valve are opened, the normal open flame is converted to the preheating flame, and the cutting nozzle is aligned with the cutting point of the ingot for preheating. After preheating for a certain period of time, the signal instructs the cutting oxygen solenoid valve to open and start cutting. After the cutting is completed, close the cutting oxygen solenoid valve, the preheating oxygen solenoid valve, and the gas solenoid valve, and wait for the next cutting. However, during the waiting period, the preheating oxygen bypass valve and the gas bypass valve are always open to maintain the combustion state, wasting gas and oxygen. According to the operation rate of the steel plant, the waiting time is generally longer than the cutting time. For example, a factory produces 1280mm×200mm slabs with a pulling speed of 1m / min. It takes 10 minutes to pull a 10m cut length, of which the cutting time is only 2min30s and the waiting time is 7min30s. The waiting time is three times the cutting time. The longer the cut length, the longer the waiting time, which results in a large waste of gas and oxygen during the waiting time.

[0003] When a flame cutting machine cuts stainless steel, iron powder needs to be added to assist in cutting. However, iron powder will accumulate in large quantities on surrounding equipment. Adding an automatic ignition device is required to reduce the impact of iron powder accumulation.

[0004] This device can significantly reduce the waste of oxygen and fuel gas during the waiting period for cutting, reduce energy consumption, save production costs, and effectively reduce the accumulation of iron powder and slag on the ignition device during stainless steel cutting, thereby increasing the ignition success rate and the service life of the ignition device. Utility Model Content

[0005] The utility model aims to solve the above problems and provides an automatic ignition device for flame cutting of stainless steel continuous casting billets.

[0006] The purpose of the utility model is achieved as follows: an automatic ignition device for flame cutting of stainless steel continuous casting billets, comprising: an ignition device, a control device, and a cutting gun device; the cutting gun device comprises a flame cutting gun, a first gas pipeline, a preheating oxygen pipe, a cutting oxygen pipe, a first cooling water inlet pipe, a first cooling water return pipe, a first gas control solenoid valve, a preheating oxygen control solenoid valve, and a cutting oxygen control solenoid valve; the ignition device comprises an ignition gun, a ceramic insulated ignition needle, an annular compressed air pipe, a second gas pipeline, a second gas control solenoid valve, a second cooling water inlet pipe, a second cooling water return pipe, and a compressed air control solenoid valve; the control device comprises a programmable logic controller, an ignition high-voltage package, and a power supply; the flame cutting gun is connected to the first gas pipeline, the preheating oxygen pipe, the cutting oxygen pipe, the first cooling water inlet pipe, and the first cooling water return pipe, the first gas pipeline is provided with a first gas control solenoid valve, the preheating oxygen pipe is provided with a preheating oxygen control solenoid valve, and the preheating oxygen control solenoid valve is provided with a preheating oxygen control solenoid valve. A cutting oxygen control solenoid valve is arranged on the control solenoid valve and the cutting oxygen pipe; the ignition gun has a double-layer structure, with a shell inside and a protective cover outside the shell. A ceramic insulated ignition needle and a second gas pipeline are arranged inside the shell. The second gas pipeline is connected to the first gas pipeline. A second gas control solenoid valve is arranged on the second gas pipeline. The ceramic insulated ignition needle is connected to the ignition high-voltage package through a cable. A second cooling water inlet pipe, a second cooling water return pipe and an annular compressed air pipe are arranged outside the shell and inside the protective cover. The second cooling water inlet pipe is connected to the first cooling water inlet pipe, the second cooling water return pipe is connected to the first cooling water return pipe, and a compressed air control solenoid valve is arranged on the annular compressed air pipe; the first gas control solenoid valve, the preheating oxygen control solenoid valve, the cutting oxygen control solenoid valve, the second gas control solenoid valve, and the compressed air control solenoid valve are all connected to a programmable logic controller, and the programmable logic controller is electrically connected to a power supply.

[0007] The power supply is 220V.

[0008] The beneficial effects of the utility model are: the application of the device can greatly reduce the waste of oxygen and fuel gas during the cutting waiting period, reduce energy consumption by about 30%-40%, save production costs, and can also effectively reduce the accumulation of iron powder and cutting slag in the ignition device when cutting stainless steel, thereby improving the ignition success rate and the service life of the ignition device. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The utility model is further described below in conjunction with the accompanying drawings.

[0010] Figure 1 It is a structural schematic diagram of the utility model.

[0011] Among them: 1. Cable, 2. Second cooling water return pipe, 3. Second cooling water inlet pipe, 4. Ignition gun, 5. Ceramic insulated ignition needle, 6. Annular compressed air pipe, 7. Gas pipeline inside the ignition gun, 8. Second gas pipeline, 9. Compressed air pipe, 10. First gas control solenoid valve, 11. Preheating oxygen control solenoid valve, 12. Cutting oxygen control solenoid valve, 13. Compressed air control solenoid valve, 14. Second gas control solenoid valve, 15. First gas pipeline, 16. Preheating oxygen pipe, 17. Cutting oxygen pipe, 18. First cooling water inlet pipe, 19. First cooling water return pipe, 20. Programmable logic controller, 21. Ignition high-voltage package, 22. Power supply. DETAILED DESCRIPTION

[0012] This device is installed on the original cutting gun system (including cooling water inlet and return pipelines, gas pipelines and solenoid valves 10, preheating sample gas pipelines and solenoid valves 11, cutting oxygen pipelines and solenoid valves 12, cutting guns, etc.), wherein the cooling water inlet and return and gas required by the ignition device must be separated from the original pipelines of the cutting gun, and the gas solenoid valve 14 of the ignition device is also controlled by the control box of the original cutting gun after the program is changed. 1 in the figure is the connection line between the ignition gun high-voltage package and the ceramic insulated ignition needle, 2 is the cooling return water metal hose connected to the ignition gun, 3 is the cooling water inlet metal hose connected to the ignition gun, 4 is the ignition gun body, which is hollow inside and has cooling water passing through the outer shell, 5 is the ceramic insulated ignition needle, 6 is the annular purge pipe in the protective sleeve, 7 is the gas pipeline inside the ignition gun, 8 is the gas metal hose connected to the ignition gun, and 9 is the metal hose connecting the compressed air solenoid valve 13 and the annular purge pipe in the ignition gun protective sleeve. The working principle of the ignition device is that the PLC control box sends a signal, and the high-voltage package generates a high-voltage pulse to drive the ceramic insulated ignition needle in the ignition gun to generate an electric spark. At the same time, the gas solenoid valve of the ignition gun opens, and the gas is delivered to the muzzle of the ignition gun. The electric spark ignites the flame, thereby igniting the cutting gun. The ignition gun is placed in the protective cover of the ignition device, and there is an annular purge pipe in the protective cover, which can effectively reduce the accumulation of iron powder and cutting slag in the ignition device when cutting stainless steel.

[0013] An automatic ignition device for flame cutting of stainless steel continuous casting billet comprises: an ignition device, a control device, and a cutting gun device; the cutting gun device comprises a flame cutting gun, a first gas pipeline, a preheating oxygen pipe, a cutting oxygen pipe, a first cooling water inlet pipe, a first cooling water return pipe, a first gas control solenoid valve, a preheating oxygen control solenoid valve, and a cutting oxygen control solenoid valve; the ignition device comprises an ignition gun, a ceramic insulated ignition needle, an annular compressed air pipe, a second gas pipeline, a second gas control solenoid valve, a second cooling water inlet pipe, a second cooling water return pipe, and a compressed air control solenoid valve; the control device comprises a programmable logic controller, an ignition high-voltage package, and a power supply; the flame cutting gun is connected with the first gas pipeline, the preheating oxygen pipe, the cutting oxygen pipe, the first cooling water inlet pipe, and the first cooling water return pipe; the first gas pipeline is provided with a first gas control solenoid valve; the preheating oxygen pipe is provided with a preheating oxygen control solenoid valve; the cutting oxygen pipe ... A cutting oxygen control solenoid valve is provided; the ignition gun has a double-layer structure, with a shell inside and a protective cover outside the shell. A ceramic insulated ignition needle and a second gas pipeline are provided inside the shell, the second gas pipeline is connected to the first gas pipeline, and a second gas control solenoid valve is provided on the second gas pipeline. The ceramic insulated ignition needle is connected to the ignition high-voltage package through a cable with a high-temperature protective cover. A second cooling water inlet pipe, a second cooling water return pipe and an annular compressed air pipe are provided outside the shell and inside the protective cover. The second cooling water inlet pipe is connected to the first cooling water inlet pipe, the second cooling water return pipe is connected to the first cooling water return pipe, and a compressed air control solenoid valve is provided on the annular compressed air pipe; the first gas control solenoid valve, the preheating oxygen control solenoid valve, the cutting oxygen control solenoid valve, the second gas control solenoid valve, and the compressed air control solenoid valve are all connected to a programmable logic controller, and the programmable logic controller is electrically connected to a power supply.

[0014] The power supply is 220V.

[0015] The ignition device is located on a fixed bracket at one side of the terminal of the cutting machine body where the cutting gun device is located.

[0016] The technical scheme of the present invention is as follows: 1. A fixed ignition device bracket is installed on both sides of the cutting gun terminal of the flame cutting machine. A compressed air pipeline is installed and connected to the air purge port of the ignition device sheath, which is controlled by the solenoid valve 13. The purge pipe in the protective sheath is annular and the opening faces the ignition direction. 2. A pipeline is divided from the gas pipe, the cooling water inlet pipe, and the cooling water return pipe for use by the ignition device, and the gas is controlled by the solenoid valve 14. 3. Automatic ignition action is realized through PLC control: when the continuous casting billet is about to reach the cutting length required for production, the flame cutting machine issues a clamping mechanism pre-clamping instruction, opens the gas solenoid valve 10 and the preheating oxygen solenoid valve 11, and the preheating flame of the cutting gun is completed. At the same time, the gas solenoid valve 14 of the ignition device is instructed to open for a certain period of time. The high-voltage ignition package of the ignition device is energized for 1-3 seconds, and an electric spark is generated through the ignition needle of the ignition device to ignite the ignition device, thereby igniting the preheating flame of the cutting gun. In order to improve the success rate of ignition, the ignition action can be repeated several times. After the ignition is completed, the purge air solenoid valve 13 of the ignition device is opened, and a positive pressure is formed at the mouth of the ignition device protection sleeve to block the cutting slag and iron powder during stainless steel cutting. 4. After the cutting is completed, after the PLC sends a clamping lifting signal, the purge air solenoid valve 13 of the ignition device is closed after a delay of 2-10 seconds.

[0017] The function of the cooling water inlet pipe and the cooling water return pipe is to cool the ignition gun to prevent the ceramic insulated ignition needle and gas pipeline inside the ignition gun from burning.

[0018] The ignition device is fixed to the cylindrical protective cover, which is fixed to the welded steel structure on the cutting machine body. The ignition gun of the ignition device is inserted from the upper end of the protective cover and fixed. It is fixed to the outer side of the cutting gun terminal of the flame cutting machine, otherwise it is easy to accumulate iron powder and cutting slag, affecting the ignition success rate and the service life of the ignition device. There is an annular purge pipe in the protective cover of the ignition device. During the cutting process, there is a positive pressure environment formed by compressed air in the protective cover to block the cutting slag and iron powder when cutting stainless steel ingots.

[0019] Embodiment: A support and protection system for an ignition device is fixed on the outside of the cutting gun terminal of a flame cutting machine. The ignition gun is placed in a protective sleeve with an annular purge pipe. Through PLC control, when the clamping system of the cutting machine is pre-clamped, the gas solenoid valve 10 and the preheating oxygen solenoid valve 11 of the cutting gun are opened, and the preheating flame gas distribution is completed. At the same time, the gas solenoid valve 14 of the ignition device is controlled to open for a certain period of time. The high-voltage ignition package of the ignition device is energized for 1-3 seconds, and an electric spark is generated through the ignition needle of the ignition device and the gun body to ignite the ignition gun, thereby igniting the preheating flame of the cutting gun. After the ignition action is completed, the purge air solenoid valve 13 of the ignition device is opened after a proper delay. When the cutting is completed and the clamping receives a lifting signal, the purge air solenoid valve 13 of the ignition device is closed after a delay of 2-10 seconds.

[0020] The above description is only a specific embodiment of the present invention, but the structural features of the protection scope of the present invention are not limited thereto. Any changes or modifications made by any technician in the field of the present invention are included in the patent scope of the present invention.

Claims

1. An automatic ignition device for flame cutting of stainless steel continuous casting billets, characterized in that: include: Ignition device, control device, cutting gun device; The cutting gun device comprises a flame cutting gun, a first gas pipeline, a preheating oxygen pipe, a cutting oxygen pipe, a first cooling water inlet pipe, a first cooling water return pipe, a first gas control solenoid valve, a preheating oxygen control solenoid valve, and a cutting oxygen control solenoid valve; the ignition device comprises an ignition gun, a ceramic insulated ignition needle, an annular compressed air pipe, a second gas pipeline, a second gas control solenoid valve, a second cooling water inlet pipe, a second cooling water return pipe, and a compressed air control solenoid valve; the control device comprises a programmable logic controller, an ignition high-voltage package, and a power supply; the flame cutting gun is connected with the first gas pipeline, the preheating oxygen pipe, the cutting oxygen pipe, the first cooling water inlet pipe, and the first cooling water return pipe; the first gas pipeline is provided with a first gas control solenoid valve, the preheating oxygen pipe is provided with a preheating oxygen control solenoid valve, and the cutting oxygen pipe is provided with a cutting oxygen control solenoid valve; the ignition The gun has a double-layer structure, with a shell inside and a protective cover outside the shell. A ceramic insulated ignition needle and a second gas pipeline are arranged inside the shell. The second gas pipeline is connected to the first gas pipeline. A second gas control solenoid valve is arranged on the second gas pipeline. The ceramic insulated ignition needle is connected to the ignition high-voltage package through a cable. A second cooling water inlet pipe, a second cooling water return pipe and an annular compressed air pipe are arranged outside the shell and inside the protective cover. The second cooling water inlet pipe is connected to the first cooling water inlet pipe, the second cooling water return pipe is connected to the first cooling water return pipe, and a compressed air control solenoid valve is arranged on the annular compressed air pipe; the first gas control solenoid valve, the preheating oxygen control solenoid valve, the cutting oxygen control solenoid valve, the second gas control solenoid valve, and the compressed air control solenoid valve are all connected to a programmable logic controller, and the programmable logic controller is electrically connected to a power supply.

2. The automatic ignition device for flame cutting of stainless steel continuous casting billet according to claim 1, characterized in that: The power supply is 220V.

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