Oxyhydrogen cutting gun and fuel gas cutting gun switching system, using method and application

Abstract

The invention belongs to the technical field of crane welding gun equipment, and discloses an oxyhydrogen cutting gun and gas cutting gun switching system, a using method and application. The system comprises a double-position gun rack, an oxyhydrogen pipeline system, a natural gas pipeline system and a control system, an oxyhydrogen cutting gun and a fuel gas cutting gun can be erected on the double-position gun rack, the oxyhydrogen cutting gun is connected with the oxyhydrogen pipeline system, the fuel gas cutting gun is connected with the natural gas pipeline system, and the control system is connected with the control system. The oxyhydrogen pipeline system and the natural gas pipeline system are connected with the control system through electric signals, and the control system can control the on-off states of the oxyhydrogen pipeline system and the natural gas pipeline system. An oxyhydrogen pipeline system and a fuel gas pipeline system which are independent of each other are integrated on a special gun rack with double stations, and remote electric control switching is carried out by a control system in a unified manner, so that remote, rapid and one-button switching between an oxyhydrogen cutting mode and a fuel gas cutting mode is realized, the switching time is shortened, and the operation response efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the technical field of crane welding torch equipment, and in particular to a switching system for hydrogen-oxygen cutting torch and gas cutting torch, its usage method and application. Background Technology

[0002] In steelmaking, oxyhydrogen (HHH) cutting and gas-fired cutting are two main thermal cutting technologies. HHH cutting offers advantages such as being clean and environmentally friendly, requiring no gas storage, safe operation, and producing good cut surface quality. It is particularly suitable for online and precision cutting of medium-thin or high-value-added steel grades, such as continuously cast billets, stainless steel, and alloy steel. However, it suffers from drawbacks including relatively low flame temperature, insufficient cutting efficiency for thick slabs and ingots, and high initial investment costs. Traditional gas-fired cutting technology, on the other hand, boasts advantages such as high flame temperature, rapid preheating, strong penetration, mature equipment, and low overall operating costs. It is particularly suitable for heavy and rough cutting scenarios where high cut surface quality is not critical, such as cutting steel ingots, thick scrap steel, and slag cleaning. However, it has inherent drawbacks such as reliance on fossil fuels, carbon emissions and soot production, safety risks associated with high-pressure gas storage and transportation, and a poor working environment. Therefore, in steelmaking production, both technologies are often used interchangeably to meet different cutting needs.

[0003] However, the current switching system is designed so that hydrogen-oxygen cutting and gas cutting torches share the same pipeline. If any cutting torch malfunctions during use, manual intervention is required. This involves manually switching a set of valves on-site and adjusting the gas medium pressure. The switching and repair work is cumbersome, and the complex pipeline also makes it easy for valves to be switched on or off incorrectly, which seriously affects production efficiency.

[0004] Therefore, there is an urgent need to design a new type of switching system for hydrogen-oxygen cutting guns and gas cutting guns. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a switching system for hydrogen-oxygen cutting guns and gas cutting guns, its usage method, and its application.

[0006] The technical solution adopted by this invention to solve its technical problem is: A system for switching between an oxyhydrogen (HHH) cutting torch and a gas cutting torch is disclosed. The system includes a dual-position torch holder, an HHH pipeline system, a natural gas pipeline system, and a control system. The dual-position torch holder can mount both an HHH and a gas cutting torch. The HHH cutting torch is connected to the HHH pipeline system, and the gas cutting torch is connected to the natural gas pipeline system. The HHH and natural gas pipeline systems are connected to the control system via electrical signals. The control system can control the on / off states of the HHH and natural gas pipeline systems. Operators can switch the supply lines for the HHH and gas cutting torches on the dual-position torch holder by operating the control system.

[0007] Furthermore, the double-position gun mount includes a horizontal plate, a vertical plate, an inclined plate, a fixed plate, a gun position plate, and a gun position hole. The horizontal plate is arranged horizontally, and the vertical plate is arranged vertically. The top of the vertical plate is connected to one horizontal end of the horizontal plate, and the top of the inclined plate is connected to the other horizontal end of the horizontal plate. The bottom of the inclined plate is connected to the bottom of the vertical plate. The horizontal plate, vertical plate, and inclined plate are connected to each other to form a triangular structure, which can provide stable support for the double-position gun mount. The fixed plate is arranged horizontally, parallel to the horizontal plate, and spaced apart vertically. The horizontal ends of the fixed plate are connected to the inclined plate and the vertical plate respectively. The fixed plate can strengthen the triangular structure. The gun position plate is set vertically, and two gun position plates are set horizontally at intervals. The upper surface of the gun position plate is connected to the lower surface of the longitudinal side of the horizontal plate by a hinge. The gun position plate can be rotated vertically around the horizontal plate by the hinge. The geometric center of the gun position plate is set with a gun position hole coaxially through the vertical direction. The hydrogen-oxygen cutting gun or gas cutting gun can be inserted into the double gun holder through the gun position hole, and then the vertical rotation of the gun position plate and the horizontal plate is carried out for cutting.

[0008] Furthermore, the hydrogen-oxygen pipeline includes a hydrogen-oxygen output pipe, a first hydrogen-oxygen solenoid valve, a second hydrogen-oxygen solenoid valve, a hydrogen-oxygen natural gas input pipe, a hydrogen-oxygen oxygen input pipe, and a hydrogen-oxygen nitrogen input pipe. Each of the hydrogen-oxygen natural gas input pipe, hydrogen-oxygen oxygen input pipe, and hydrogen-oxygen nitrogen input pipe is equipped with a valve. Both the first and second hydrogen-oxygen solenoid valves are three-way solenoid valves. The hydrogen-oxygen output pipe, hydrogen-oxygen natural gas input pipe, hydrogen-oxygen hydrogen input pipe, and hydrogen-oxygen oxygen input pipe are all arranged vertically. The first and second hydrogen-oxygen solenoid valves are sequentially installed vertically on the hydrogen-oxygen output pipe. The hydrogen-oxygen natural gas input pipe is connected to the first hydrogen-oxygen solenoid valve... The system is configured with the following connections: the hydrogen-oxygen-oxygen inlet pipe is connected to the second hydrogen-oxygen solenoid valve; the hydrogen-oxygen-nitrogen inlet pipe is connected to the hydrogen-oxygen outlet pipe in parallel; the bottom of the hydrogen-oxygen-nitrogen inlet pipe is connected to the hydrogen-oxygen cutting gun via a pipe; and the top of the hydrogen-oxygen outlet pipe is connected to an external hydrogen-oxygen mixed gas source via a pipe. The hydrogen-oxygen outlet pipe provides the hydrogen-oxygen mixed gas source, the hydrogen-oxygen-natural gas inlet pipe provides natural gas, the first hydrogen-oxygen solenoid valve controls the input and output of natural gas, the hydrogen-oxygen-oxygen inlet pipe provides preheated oxygen, the second hydrogen-oxygen solenoid valve controls the input and output of preheated oxygen, and the hydrogen-oxygen-nitrogen inlet pipe provides nitrogen.

[0009] The hydrogen-oxygen pipeline includes a gas output pipe, a first gas solenoid valve, a second gas solenoid valve, a natural gas input pipe, and a gas-oxygen input pipe. Both the natural gas and gas-oxygen input pipes are equipped with valves. Both the first and second gas solenoid valves are three-way valves. The gas output pipe, natural gas input pipe, and gas-oxygen input pipe are all arranged vertically. The first and second gas solenoid valves are sequentially installed vertically on the gas output pipe. The natural gas input pipe is connected to the first gas solenoid valve, and the gas-oxygen input pipe is connected to the second gas solenoid valve. The top of the gas output pipe is connected to an external high-pressure oxygen source, and the bottom of the gas output pipe is connected to a gas cutting gun via a pipeline. The natural gas input pipe provides natural gas, and the gas-oxygen input pipe provides preheated oxygen. The first gas solenoid valve controls the input and output of natural gas, and the second gas solenoid valve controls the input and output of preheated oxygen.

[0010] Furthermore, multiple hydrogen-oxygen output pipes and gas output pipes are arranged horizontally at intervals. Each hydrogen-oxygen output pipe and gas output pipe can supply one hydrogen-oxygen cutting gun and one gas cutting gun, respectively, so that the system can supply multiple hydrogen-oxygen cutting guns and gas cutting guns at the same time.

[0011] Furthermore, the control system is a traditional PLC control system, and the valves in the hydrogen-oxygen pipeline system and the natural gas pipeline system are all solenoid valves. The PLC control system controls the switching of the solenoid valves in the hydrogen-oxygen pipeline system and the natural gas pipeline system.

[0012] The method of using the system as described above includes the following steps: (1) The staff inserts the hydrogen-oxygen cutting gun and the gas cutting gun into the double-position gun holder, and then adjusts them through the external control system to open the second solenoid valve of hydrogen-oxygen and the second solenoid valve of gas to output preheated oxygen, so that the hydrogen-oxygen cutting gun and the gas cutting gun are preheated. (2) The staff can select according to the needs, open the first solenoid valve of hydrogen-oxygen or the first solenoid valve of gas, and then start the hydrogen-oxygen cutting gun or the gas cutting gun; when changing, open the first solenoid valve of hydrogen-oxygen or the first solenoid valve of gas and close the other first solenoid valve to achieve the switching. (3) When a certain pipeline system fails, the first solenoid valve of the pipeline is closed, the pipeline system stops working, and the other pipeline can work normally.

[0013] The system described above is used in the cutting of steel billets in steelmaking.

[0014] The advantages and positive effects of this invention are as follows: 1. This invention integrates independent hydrogen-oxygen and gas pipeline systems onto a dedicated gun holder with dual workstations. The control system enables remote, rapid, and one-button switching between hydrogen-oxygen and gas cutting modes. Operators do not need to be on-site to manually open or close valves or adjust pressure, which greatly simplifies the operation process, shortens the switching time, and improves the efficiency of operation response.

[0015] 2. The dual-pipeline physical isolation design eliminates safety hazards such as media confusion and misoperation caused by shared pipelines. At the same time, when one system fails, it can be immediately switched to the other system to continue working, ensuring the continuity and reliability of the cutting operation.

[0016] 3. The dual-position gun holder structure provides a stable and convenient foundation for the installation and retrieval of both types of cutting guns. Combined with the flip-up gun position plate, this further improves the productivity of the workers. The system of this invention supports the simultaneous operation of multiple cutting guns by connecting multiple output pipes in parallel, meeting the needs of large-scale production. Attached Figure Description

[0017] Figure 1 This is a front view of a structural connection of a dual-position gun mount according to the present invention; Figure 2 for Figure 1 A structural connection side view; Figure 3 for Figure 1 A top view of a structural connection; Figure 4 This is a structural connection front view of the hydrogen-oxygen pipeline system of the present invention; Figure 5 This is a structural connection front view of the natural gas pipeline system of the present invention; Figure 6 This is a photograph of the hydrogen-oxygen pipeline system of the present invention; Figure 7 This is a photograph of the natural gas pipeline system of the present invention. Detailed Implementation

[0018] The present invention will be further described below with reference to the embodiments. The following embodiments are descriptive and not limiting, and should not be used to limit the scope of protection of the present invention.

[0019] The various experimental operations involved in the specific embodiments are all conventional techniques in the field. For parts not specifically annotated in this document, those skilled in the art can refer to various commonly used reference books, scientific and technological documents or related instructions and manuals prior to the filing date of this invention to carry out the operations.

[0020] A system for switching between an oxyhydrogen (HHH) cutting torch and a gas cutting torch is disclosed. The system includes a dual-position torch holder 1, an HHH pipeline system 2, a natural gas pipeline system 3, and a control system (not shown in the figure). The dual-position torch holder can mount both an HHH HH cutting torch and a gas cutting torch (neither shown in the figure). The HHH HH cutting torch is connected to the HHH pipeline system, and the gas cutting torch is connected to the natural gas pipeline system. The HHH HH pipeline system and the natural gas pipeline system are connected to the control system via electrical signals. The control system can control the on / off state of the HHH HH pipeline system and the natural gas pipeline system. Operators can switch the supply lines of the HHH HH cutting torch and the gas cutting torch on the dual-position torch holder by operating the control system, facilitating switching according to actual working conditions.

[0021] like Figures 1 to 3 As shown, the double-position gun mount includes a horizontal plate 1-1, a vertical plate 1-2, an inclined plate 1-3, a fixed plate 1-4, a gun position plate 1-5, and a gun position hole 1-6. The horizontal plate is arranged horizontally, and the vertical plate is arranged vertically. The top of the vertical plate is connected to one horizontal end of the horizontal plate, and the top of the inclined plate is connected to the other horizontal end of the horizontal plate. The bottom of the inclined plate is connected to the bottom of the vertical plate. The horizontal plate, vertical plate, and inclined plate are interconnected and form a triangular structure, which can provide stable support for the double-position gun mount. The fixed plate is arranged horizontally, parallel to the horizontal plate, and spaced apart vertically. The horizontal ends of the fixed plate are connected to the inclined plate and the vertical plate, respectively. The fixed plate can strengthen the triangular structure and further improve the stability of the double-position gun mount. The gun position plate is set vertically, and two gun position plates are set horizontally at intervals. The upper surface of the gun position plate is connected to the lower surface of the longitudinal side of the horizontal plate by a hinge. The gun position plate can be rotated vertically around the horizontal plate by the hinge, which is convenient for the use of hydrogen-oxygen cutting guns and gas cutting guns. The geometric center of the gun position plate is set with a gun position hole coaxially through the vertical direction. The hydrogen-oxygen cutting gun or gas cutting gun can be inserted into the double gun holder through the gun position hole, and then the vertical rotation of the gun position plate and the horizontal plate is carried out for cutting operation, which is convenient for operators.

[0022] like Figure 4 and Figure 6As shown, the hydrogen-oxygen pipeline includes a hydrogen-oxygen output pipe 2-1, a hydrogen-oxygen first solenoid valve 2-2, a hydrogen-oxygen second solenoid valve 2-3, a hydrogen-oxygen natural gas input pipe 2-4, a hydrogen-oxygen oxygen input pipe 2-5, and a hydrogen-oxygen nitrogen input pipe 2-6. Each of the hydrogen-oxygen natural gas input pipe, hydrogen-oxygen oxygen input pipe, and hydrogen-oxygen nitrogen input pipe is equipped with valves (not labeled in the figure) for easy opening and closing during inspection. Both the hydrogen-oxygen first solenoid valve and the hydrogen-oxygen second solenoid valve are three-way solenoid valves. The hydrogen-oxygen output pipe, hydrogen-oxygen natural gas input pipe, hydrogen-oxygen hydrogen input pipe, and hydrogen-oxygen oxygen input pipe are all arranged vertically. The hydrogen-oxygen first solenoid valve and the hydrogen-oxygen second solenoid valve are sequentially installed vertically on the hydrogen-oxygen output pipe. The inlet pipe is connected to the first solenoid valve for hydrogen and oxygen, the hydrogen-oxygen-oxygen inlet pipe is connected to the second solenoid valve for hydrogen and oxygen, and the hydrogen-oxygen-nitrogen inlet pipe is connected in parallel with the hydrogen-oxygen outlet pipe. The bottom of the hydrogen-oxygen-nitrogen inlet pipe is connected to the hydrogen-oxygen cutting torch via a pipe, and the top of the hydrogen-oxygen outlet pipe is connected to an external hydrogen-oxygen mixed gas source via a pipe. The hydrogen-oxygen outlet pipe provides a hydrogen-oxygen mixed gas source, the hydrogen-oxygen-natural gas inlet pipe provides natural gas, the first solenoid valve for hydrogen and oxygen controls the input and output of natural gas, the hydrogen-oxygen-oxygen inlet pipe provides preheated oxygen for easy cutting, the second solenoid valve for hydrogen and oxygen controls the input and output of preheated oxygen, and the hydrogen-oxygen-nitrogen inlet pipe provides nitrogen to protect the cutting torch.

[0023] like Figure 5 and Figure 7 As shown, the hydrogen-oxygen pipeline includes a gas output pipe 3-1, a first gas solenoid valve 3-2, a second gas solenoid valve 3-3, a natural gas input pipe 3-4, and a gas-oxygen input pipe 3-5. Both the natural gas input pipe and the gas-oxygen input pipe are equipped with valves (not labeled in the figure) for easy opening and closing during inspection. Both the first and second gas solenoid valves are three-way valves. The gas output pipe, natural gas input pipe, and gas-oxygen input pipe are all arranged vertically. The first and second gas solenoid valves are sequentially installed vertically on the gas output pipe. The natural gas input pipe is connected to the first gas solenoid valve, and the gas-oxygen input pipe is connected to the second gas solenoid valve. The top of the gas output pipe is connected to an external high-pressure oxygen source, and the bottom of the gas output pipe is connected to a gas cutting gun via a pipeline. The natural gas input pipe provides natural gas, and the gas-oxygen input pipe provides preheated oxygen for easy cutting operations. The first gas solenoid valve controls the input and output of natural gas, and the second gas solenoid valve controls the input and output of preheated oxygen.

[0024] In this embodiment, multiple hydrogen-oxygen output pipes and gas output pipes are arranged at intervals along the horizontal direction. Each hydrogen-oxygen output pipe and gas output pipe can supply one hydrogen-oxygen cutting gun and one gas cutting gun, respectively, so that the system can supply multiple hydrogen-oxygen cutting guns and gas cutting guns at the same time, thereby improving the efficiency of use.

[0025] In this embodiment, the control system is a traditional PLC control system. The valves in the hydrogen-oxygen pipeline system and the natural gas pipeline system are all solenoid valves. The PLC control system controls the switching of the solenoid valves in the hydrogen-oxygen pipeline system and the natural gas pipeline system, thereby realizing the automated operation of the system.

[0026] The method of using the system as described above includes the following steps: (1) The staff inserts the hydrogen-oxygen cutting gun and the gas cutting gun into the double-position gun holder, and then adjusts them through the external control system to open the second solenoid valve of hydrogen-oxygen and the second solenoid valve of gas to output preheated oxygen, so that the hydrogen-oxygen cutting gun and the gas cutting gun are preheated. (2) The staff can select according to the needs, open the first solenoid valve of hydrogen-oxygen or the first solenoid valve of gas, and then start the hydrogen-oxygen cutting gun or the gas cutting gun; when changing, open the first solenoid valve of hydrogen-oxygen or the first solenoid valve of gas and close the other first solenoid valve to achieve the switching. (3) When a certain pipeline system fails, the first solenoid valve of the pipeline is closed, the pipeline system stops working, and the other pipeline can work normally.

[0027] The system described above is used in the cutting of steel billets in steelmaking.

[0028] This invention integrates independent hydrogen-oxygen and gas pipeline systems onto a dedicated dual-station gun holder. A unified control system remotely switches between hydrogen-oxygen and gas cutting modes, enabling rapid, one-button switching. Operators no longer need to manually open / close valves or adjust pressure on-site, significantly simplifying the operation, shortening switching time, and improving operational response efficiency. The physically isolated dual-pipeline design eliminates safety hazards such as media mixing and misoperation caused by shared pipelines. Furthermore, if one system fails, it can be immediately switched to the other, ensuring the continuity and reliability of cutting operations. The dual-station gun holder structure provides a stable and convenient foundation for the installation and retrieval of both cutting torches, and the flip-up gun holder further improves worker productivity. This system supports multiple cutting torches simultaneously via parallel output pipes, meeting the needs of large-scale production.

[0029] Although embodiments of the invention have been disclosed for illustrative purposes, those skilled in the art will understand that various substitutions, variations, and modifications are possible without departing from the spirit and scope of the invention and the appended claims. Therefore, the scope of the invention is not limited to the contents disclosed in the embodiments.

Claims

1. A oxy-hydrogen cutting gun and gas cutting gun switching system, characterized in that: The system comprises a double-position gun rack, a hydrogen-oxygen pipeline system, a natural gas pipeline system and a control system, the double-position gun rack can accommodate a hydrogen-oxygen cutting torch and a gas cutting torch, the hydrogen-oxygen cutting torch is connected to the hydrogen-oxygen pipeline system, the gas cutting torch is connected to the natural gas pipeline system, the hydrogen-oxygen pipeline system and the natural gas pipeline system are connected to the control system through electrical signals, the control system can control the on-off state of the hydrogen-oxygen pipeline system and the natural gas pipeline system, and the worker can switch the pipelines supplying the hydrogen-oxygen cutting torch and the gas cutting torch on the double-position gun rack by operating the control system.

2. The system of claim 1, wherein: The double-position gun rack comprises a horizontal plate, a vertical plate, an inclined plate, a fixed plate, a gun position plate and a gun position hole, the horizontal plate is arranged in the horizontal direction, the vertical plate is arranged in the vertical direction, the top of the vertical plate is connected to one end of the horizontal plate in the horizontal direction, the top of the inclined plate is connected to the other end of the horizontal plate in the horizontal direction, the bottom of the inclined plate is connected to the bottom of the vertical plate in the vertical direction, the horizontal plate, the vertical plate and the inclined plate are connected to each other to form a triangular structure, the fixed plate is arranged in the horizontal direction and is parallel to the horizontal plate and is arranged in the vertical direction at intervals, the horizontal ends of the fixed plate are connected to the inclined plate and the vertical plate, respectively, and the fixed plate can strengthen the strength of the triangular structure; The gun position plate is arranged in the vertical direction, two gun position plates are arranged in the horizontal direction at intervals, the upper surface of the gun position plate is connected to the lower surface of the horizontal plate in the vertical direction through a hinge, the gun position plate can be turned in the vertical direction by rotating around the horizontal plate through the hinge, the geometric center of the gun position plate is coaxially connected to the gun position hole in the vertical direction, the hydrogen-oxygen cutting torch or the gas cutting torch can be inserted into the double-position gun rack through the gun position hole, and then the hydrogen-oxygen cutting torch or the gas cutting torch can be turned in the vertical direction by the hinge between the gun position plate and the horizontal plate to perform cutting.

3. The system of claim 1, wherein: The hydrogen-oxygen pipeline comprises a hydrogen-oxygen output pipe, a hydrogen-oxygen first electromagnetic valve, a hydrogen-oxygen second electromagnetic valve, a hydrogen-oxygen natural gas input pipe, a hydrogen-oxygen oxygen input pipe and a hydrogen-oxygen nitrogen input pipe, the hydrogen-oxygen natural gas input pipe, the hydrogen-oxygen oxygen input pipe and the hydrogen-oxygen nitrogen input pipe are all provided with valves, the hydrogen-oxygen first electromagnetic valve and the hydrogen-oxygen second electromagnetic valve are both three-way electromagnetic valves, the hydrogen-oxygen output pipe, the hydrogen-oxygen natural gas input pipe, the hydrogen-oxygen hydrogen input pipe and the hydrogen-oxygen oxygen input pipe are all arranged in the vertical direction, the hydrogen-oxygen first electromagnetic valve and the hydrogen-oxygen second electromagnetic valve are sequentially arranged on the hydrogen-oxygen output pipe in the vertical direction, the hydrogen-oxygen natural gas input pipe is connected to the hydrogen-oxygen first electromagnetic valve, the hydrogen-oxygen oxygen input pipe is connected to the hydrogen-oxygen second electromagnetic valve, and the hydrogen-oxygen nitrogen input pipe is connected to the hydrogen-oxygen output pipe in parallel, the bottom of the hydrogen-oxygen nitrogen input pipe is connected to the hydrogen-oxygen cutting torch through a pipeline, the top of the hydrogen-oxygen output pipe is connected to an external hydrogen-oxygen mixed gas source through a pipeline, the hydrogen-oxygen output pipe can provide the hydrogen-oxygen mixed gas source, the hydrogen-oxygen natural gas input pipe can provide natural gas, the hydrogen-oxygen first electromagnetic valve can control the input and output of the natural gas, the hydrogen-oxygen oxygen input pipe can provide preheating oxygen, the hydrogen-oxygen second electromagnetic valve can control the input and output of the preheating oxygen, and the hydrogen-oxygen nitrogen input pipe can provide nitrogen. The hydrogen-oxygen pipeline comprises a gas output pipe, a gas first electromagnetic valve, a gas second electromagnetic valve, a gas natural gas input pipe and a gas oxygen input pipe, the gas natural gas input pipe and the gas oxygen input pipe are both provided with valves, the gas first electromagnetic valve and the gas second electromagnetic valve are both three-way valves, the gas output pipe, the gas natural gas input pipe and the gas oxygen input pipe are all arranged along the vertical direction, the gas first electromagnetic valve and the gas second electromagnetic valve are sequentially arranged on the gas output pipe along the vertical direction, the gas natural gas input pipe is connected with the gas first electromagnetic valve, and the gas oxygen input pipe is connected with the gas second electromagnetic valve, the top of the gas output pipe is connected with an external high-pressure oxygen source, the bottom of the gas output pipe is connected with a gas cutting torch through a pipeline, the gas natural gas input pipe can provide natural gas, the gas oxygen input pipe can provide preheated oxygen, the gas first electromagnetic valve can control the input and output of the natural gas, and the gas second electromagnetic valve can control the input and output of the preheated oxygen.

4. The system of claim 3, wherein: The hydrogen-oxygen output pipes and the gas output pipes are both arranged in multiple numbers at intervals along the horizontal direction, each hydrogen-oxygen output pipe and each gas output pipe can supply one hydrogen-oxygen cutting torch and one gas cutting torch, so that the system can simultaneously supply multiple hydrogen-oxygen cutting torches and multiple gas cutting torches.

5. The system of claim 1, wherein: The control system is a conventional PLC control system, the valves in the hydrogen-oxygen pipeline system and the natural gas pipeline system are all electromagnetic valves, and the electromagnetic valves in the hydrogen-oxygen pipeline system and the natural gas pipeline system are switched on and off by the PLC control system.

6. A method of using the system of any one of claims 1 to 5, characterized in that: The method comprises the following steps: (1) the worker inserts the hydrogen-oxygen cutting torch and the gas cutting torch into the double-position torch holder, and then controls the opening of the hydrogen-oxygen second electromagnetic valve and the gas second electromagnetic valve to output preheated oxygen by the external control system, so that the hydrogen-oxygen cutting torch and the gas cutting torch are preheated; (2) the worker selects the hydrogen-oxygen first electromagnetic valve or the gas first electromagnetic valve to be opened according to the need, and then starts the hydrogen-oxygen cutting torch or the gas cutting torch; when the hydrogen-oxygen cutting torch or the gas cutting torch is replaced, the hydrogen-oxygen first electromagnetic valve or the gas first electromagnetic valve is opened, and the other first electromagnetic valve is closed, so that the switching can be realized; (3) when a pipeline system fails, the first electromagnetic valve of the pipeline is closed, the pipeline system stops working, and the other pipeline can normally work.

7. The use of the system according to any one of claims 1 to 5 in the cutting of steel billets for steelmaking.

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