Anti-backfire cutting gun and cutting torch thereof

Abstract

The invention discloses an anti-backfire cutting gun and a cutting nozzle thereof, and relates to the technical field of cutting guns, the cutting gun comprises a connecting assembly, a main body pipeline and the cutting nozzle, the connecting assembly is connected to a cutting machine, gas enters the connecting assembly through a PLC control system on the cutting machine, the PLC control system automatically controls the cutting machine to open a control valve, and the cutting gun is started. The control valve feeds hydrogen into the cutting torch from the gas pipe, the control valve feeds oxygen into the cutting torch from the preheating oxygen pipe, the hydrogen and the oxygen are fed respectively, burning loss of the cutting torch caused by mutual blow-by during tempering can be prevented, the mixture of the oxygen and the hydrogen is ignited through the electronic ignition gun, preheating flames are generated, and the metal surface is heated to the ignition point. The control valve feeds high-pressure pure oxygen into the cutting nozzle from the cutting oxygen pipe, the high-pressure pure oxygen is gradually accelerated in the cutting nozzle, high-speed gas is sprayed to a cut workpiece from the cutting nozzle, metal is combusted in oxygen jet flow, slag generated by combustion is blown away through the oxygen jet flow, and a cutting seam is formed.

Description

Technical Field

[0001] The invention relates to the technical field of cutting guns, in particular to a backfire-proof cutting gun and a cutting nozzle thereof. Background Art

[0002] The cutting gun is the core tool of gas cutting equipment. Its background technology has been continuously evolving with the development of metal processing technology. The main function of the cutting gun is to mix oxygen and fuel gas in a certain proportion, form a high-temperature flame through the nozzle, and cut or process the metal. In order to develop clean energy, hydrogen energy is used to replace fossil fuels. Since the combustion temperature of hydrogen and oxygen is 3200℃, and the combustion speed of hydrogen is 2900m / s, when cutting ultra-thick steel billets, due to the slag turning of the cutting pool or the fluctuation of hydrogen flow rate, tempering is likely to occur, causing the burning of the cutting nozzle, cutting gun and pipeline, affecting the cutting production, which is a more concentrated and difficult to solve problem in the current cutting operation. Summary of the invention

[0003] The object of the present invention is to provide a cutting gun and a cutting nozzle thereof which are anti-flashback, so as to solve the problems in the prior art.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: the cutting gun includes a main pipe, one end of the main pipe is provided with a mounting groove, one end of the main pipe is provided with a connecting assembly, one end of the connecting assembly is provided with a cutting machine, a cutting nozzle is provided in the mounting groove, and a PLC control system is provided on the cutting machine. When in use, the PLC control system automatically controls the cutting machine to open the control valve, the control valve sends hydrogen into the fuel gas pipe, the hydrogen enters the hydrogen inlet cavity and the hydrogen inlet cavity from the fuel gas pipe, and then the control valve sends preheated oxygen into the preheated oxygen pipe, the preheated oxygen enters the oxygen inlet cavity from the preheated oxygen pipe, an electronic ignition gun is used to ignite the mixture of oxygen and hydrogen, a preheated flame is generated, the metal surface is heated to the ignition point, the control valve sends high-pressure pure oxygen into the cutting oxygen pipe, the high-pressure pure oxygen enters the cutting nozzle from the cutting oxygen pipe, and is sprayed from the cutting nozzle onto the workpiece to be cut, so that the metal burns in the oxygen jet, and the slag generated by the combustion is blown away by the oxygen jet to form a cutting seam.

[0005] The connecting assembly comprises a cutting oxygen pipe, a gas pipe, a preheating oxygen pipe, a water outlet pipe and a water inlet pipe, one end of the cutting oxygen pipe, the gas pipe, the preheating oxygen pipe, the water outlet pipe and the water inlet pipe are installed on the cutting machine, and the other ends of the cutting oxygen pipe, the gas pipe, the preheating oxygen pipe, the water outlet pipe and the water inlet pipe are installed on the main pipe, the gas pipe, the preheating oxygen pipe, the water outlet pipe and the water inlet pipe are located around the cutting oxygen pipe, a water tank is arranged inside the main pipe, and the water outlet pipe and the water inlet pipe are connected to the water tank.

[0006] The pipe size of the gas pipe is larger than the pipe size of the preheating oxygen pipe, the pipe sizes of the cutting oxygen pipe and the gas pipe are the same, and the pipe sizes of the preheating oxygen pipe, the water outlet pipe and the water inlet pipe are the same.

[0007] A cutting nozzle is applied to a cutting gun with anti-flashback, the cutting nozzle comprises a cutting nozzle shell, the cutting nozzle shell is installed at one end of the cutting nozzle joint, a sealing ring is arranged on the outer surface of the cutting nozzle shell, the interior of the cutting nozzle shell is provided with a main cutting oxygen chamber, a hydrogen chamber and a mixed gas chamber from the inside to the outside, the main cutting oxygen chamber comprises a compression section and a diffusion section, the diffusion section is installed below the compression section, and the compression section is connected to the cutting oxygen pipe. When high-pressure pure oxygen flows through the compression section, the airflow is gradually accelerated due to the gradual reduction of the nozzle cross section, and in the process of flowing to the outlet through the diffusion section, the nozzle cross section of the diffusion section is continuously expanded, the airflow expands, its pressure decreases, and the flow rate continues to increase, thereby improving the cutting speed.

[0008] The hydrogen chamber includes a hydrogen inlet chamber and a hydrogen outlet chamber, one end of the hydrogen inlet chamber is connected to the fuel gas pipe, and the other end of the hydrogen inlet chamber is connected to the hydrogen outlet chamber, and the hydrogen outlet chamber is arranged between the diffusion section and the mixed gas chamber. Hydrogen flows from the hydrogen inlet chamber to the hydrogen outlet chamber, amplifying the flow rate of hydrogen, reducing the fluctuation of hydrogen flow rate, and reducing the probability of flashback.

[0009] The mixed gas chamber includes a hydrogen inlet chamber, one end of which is connected to the hydrogen outlet pipe, and the other end of the hydrogen inlet chamber is provided with a mixed gas outlet chamber, the mixed gas outlet chamber is located outside the hydrogen outlet chamber, and the other side of the mixed gas outlet chamber is provided with an oxygen inlet chamber, and one end of the oxygen inlet chamber is connected to the preheating oxygen pipe. Oxygen enters from the oxygen inlet chamber, and hydrogen enters from the hydrogen inlet chamber. Oxygen and hydrogen are mixed in the mixed gas outlet chamber. The separate air intake method can prevent mutual gas cross-talk during flashback and burn the cutting nozzle.

[0010] The sealing angle of the sealing ring is 30°5′1.8″.

[0011] The hydrogen outlet cavity and the mixed gas outlet cavity are arranged in a herringbone shape.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The present invention adopts double exhaust holes, and the outer circle is mixed with hydrogen and oxygen to enhance the preheating intensity of the flame. The ratio of hydrogen and oxygen mixed gas is 1:0.9, and the angle between the hole and the steel billet is 1°30′. The preheating flame is more concentrated and stronger, which increases the cutting combustion temperature, the steel billet temperature rises rapidly, and the cutting speed is significantly accelerated;

[0014] 2. The high-pressure oxygen and hydrogen generated by the 2° intersection angle of the oxygen and hydrogen mixing chamber in the cutting nozzle of the present invention will form a pressure difference, thereby forming a jet suction force, which can fully mix the combustion gas. All the air outlets are arranged in a herringbone shape, which can block the influence of the inert gas in the atmosphere on the purity of the cut oxygen during hydrogen combustion, protect the purity of oxygen, and improve the combustion efficiency of the main cut oxygen. At the same time, a hydrogen channel is added next to the main cut oxygen to expand the flow of hydrogen and reduce the probability of flashback;

[0015] 3. The cutting nozzle of the present invention adopts three-step surface sealing. Each sealing angle is 30°5′1.8″, so that hydrogen assists oxygen to cut oxygen, and hydrogen and oxygen are introduced separately, which can prevent mutual gas leakage during backfire, resulting in burning of the cutting nozzle;

[0016] 4. The main cutting oxygen chamber of the present invention adopts a step-by-step form. After the high-pressure gas passes through the compression section and the diffusion section, the flow rate of the gas is accelerated to Mach 2, thereby increasing the cutting speed and making the cutting section smooth and free of slag. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A three-dimensional diagram of a cutting gun and a cutting nozzle thereof according to the present invention;

[0018] Figure 2 A bottom view of the connection assembly of the present invention;

[0019] Figure 3 A cross-sectional view of a cutting gun and a cutting nozzle thereof of the present invention;

[0020] Figure 4 for Figure 3 A partial enlarged view of the middle A area;

[0021] Figure 5 is a three-dimensional diagram of the cutting nozzle of the present invention;

[0022] Figure 6 A bottom view of the cutting nozzle of the present invention;

[0023] Figure 7 A cross-sectional view of the cutting nozzle of the present invention Figure 1 ;

[0024] Figure 8 A cross-sectional view of the cutting nozzle of the present invention Figure 2 .

[0025] In the figure: 1. Connecting assembly; 11. Cutting oxygen pipe; 12. Gas pipe; 13. Preheating oxygen pipe; 14. Water outlet pipe; 15. Water inlet pipe; 2. Main pipeline; 3. Cutting nozzle; 31. Cutting nozzle shell; 32. Main cutting oxygen chamber; 321. Compression section; 322. Diffusion section; 33. Hydrogen chamber; 331. Hydrogen outlet chamber; 332. Hydrogen inlet chamber; 34. Mixed gas chamber; 341. Mixed gas outlet chamber; 342. Hydrogen inlet chamber; 343. Oxygen inlet chamber; 35. Sealing ring. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example: Figure 1-Figure 8 As shown, the present invention provides a technical solution, the cutting gun includes a main pipe 2, one end of the main pipe 2 is provided with a mounting groove, one end of the main pipe 2 is installed with a connecting component 1, one end of the connecting component 1 is installed with a cutting machine, a cutting nozzle 3 is installed in the mounting groove, and a PLC control system is installed on the cutting machine. When in use, the PLC control system automatically controls the cutting machine to open the control valve, the control valve sends hydrogen into the fuel gas pipe 12, the hydrogen enters the hydrogen chamber 332 and the hydrogen inlet chamber 342 from the fuel gas pipe 12, the control valve sends preheated oxygen into the preheated oxygen pipe 13, the preheated oxygen enters the oxygen inlet chamber 343 from the preheated oxygen pipe 13, an electronic ignition gun is used to ignite the mixture of oxygen and hydrogen to generate a preheated flame, heating the metal surface to the ignition point, the control valve sends high-pressure pure oxygen into the cutting oxygen pipe 11, the high-pressure pure oxygen enters the cutting nozzle 3 from the cutting oxygen pipe 11, and is sprayed from the cutting nozzle 3 onto the workpiece to be cut, so that the metal burns in the oxygen jet, and the slag generated by the combustion is blown away by the oxygen jet to form a cutting seam.

[0028] The connecting assembly 1 includes a cutting oxygen tube 11, a gas tube 12, a preheating oxygen tube 13, a water outlet pipe 14 and a water inlet pipe 15. One ends of the cutting oxygen tube 11, the gas tube 12, the preheating oxygen tube 13, the water outlet pipe 14 and the water inlet pipe 15 are installed on the cutting machine, and the other ends of the cutting oxygen tube 11, the gas tube 12, the preheating oxygen tube 13, the water outlet pipe 14 and the water inlet pipe 15 are installed on the main pipeline 2. The gas tube 12, the preheating oxygen tube 13, the water outlet pipe 14 and the water inlet pipe 15 are located around the cutting oxygen tube 11. A water tank is arranged inside the main pipeline 2, and the water outlet pipe 14 and the water inlet pipe 15 are connected to the water tank.

[0029] The pipe size of the gas pipe 12 is larger than the pipe size of the preheating oxygen pipe 13, the pipe sizes of the cutting oxygen pipe 11 and the gas pipe 12 are the same, and the pipe sizes of the preheating oxygen pipe 13, the water outlet pipe 14 and the water inlet pipe 15 are the same.

[0030] A cutting nozzle, the cutting nozzle 3 comprises a cutting nozzle shell 31, the cutting nozzle shell 31 is installed at one end of the cutting nozzle joint 7, a sealing ring 35 is arranged on the outer surface of the cutting nozzle shell 31, the sealing angle of the sealing ring 35 is 30°5′1.8″, the interior of the cutting nozzle shell 31 is provided with a main cutting oxygen chamber 32, a hydrogen chamber 33 and a mixed gas chamber 34 from the inside to the outside, the main cutting oxygen chamber 32 comprises a compression section 321 and a diffusion section 322, the diffusion section 322 is installed below the compression section 321, and the compression section 321 is connected to the cutting oxygen pipe 11. When high-pressure pure oxygen flows through the compression section 321, the airflow is gradually accelerated due to the gradual reduction of the nozzle cross section, and in the process of flowing to the outlet through the diffusion section 322, the nozzle cross section of the diffusion section 322 is continuously expanded, the airflow expands, its pressure decreases, and the flow rate continues to increase, thereby improving the cutting speed.

[0031] The hydrogen chamber 33 includes a hydrogen inlet chamber 332 and a hydrogen outlet chamber 331. One end of the hydrogen inlet chamber 332 is connected to the hydrogen outlet pipe 5, and the other end of the hydrogen inlet chamber 332 is connected to the hydrogen outlet chamber 331. The hydrogen outlet chamber 331 is arranged between the diffusion section 322 and the mixed gas chamber 34. Hydrogen flows from the hydrogen inlet chamber 332 to the hydrogen outlet chamber 331, amplifying the flow rate of hydrogen, reducing the fluctuation of the hydrogen flow rate, and reducing the probability of flashback.

[0032] The mixed gas chamber 34 includes a hydrogen inlet chamber 342, one end of which is connected to the hydrogen outlet pipe 5, and the other end of the hydrogen inlet chamber 342 is provided with a mixed gas outlet chamber 341, and the mixed gas outlet chamber 341 is located outside the hydrogen outlet chamber 331, and the other side of the mixed gas outlet chamber 341 is provided with an oxygen inlet chamber 343, and one end of the oxygen inlet chamber 343 is connected to the preheating oxygen pipe 13, and the hydrogen outlet chamber 331 and the mixed gas outlet chamber 341 are arranged in a triangular shape. Oxygen enters from the oxygen inlet chamber 343, and hydrogen enters from the hydrogen inlet chamber 342. Oxygen and hydrogen are mixed in the mixed gas outlet chamber 341. The separate air intake method can prevent mutual gas cross-talk during flashback and burn the cutting nozzle.

[0033] Working principle of the present invention:

[0034] When in use, the PLC control system automatically controls the cutting machine to open the control valve, and the control valve sends hydrogen into the fuel gas pipe 12, and the hydrogen enters the hydrogen chamber 332 and the hydrogen inlet chamber 342 from the fuel gas pipe 12, and then the control valve sends preheated oxygen into the preheated oxygen pipe 13, and the preheated oxygen enters the oxygen inlet chamber 343 from the preheated oxygen pipe 13, and an electronic ignition gun is used to ignite the mixture of oxygen and hydrogen to generate a preheated flame. The flame is adjusted by controlling the flow rate of the preheated oxygen through the PLC control system. When it is adjusted to a neutral flame, the cutting nozzle 3 is aimed at the part of the metal surface to be cut.

[0035] When the metal surface is preheated to dark red, the control valve sends high-pressure pure oxygen into the cutting oxygen pipe 11, and the high-pressure pure oxygen enters the compression section 321 from the cutting oxygen pipe 11. When the high-pressure pure oxygen flows through the compression section 321, the airflow is gradually accelerated due to the gradual reduction of the nozzle cross-section. In the process of flowing to the outlet through the diffusion section 322, the nozzle cross-section of the diffusion section 322 continues to expand, the airflow expands, its pressure decreases, and the flow rate continues to increase to 2 Mach, and is sprayed from the diffusion section 322 to the workpiece being cut, so that the metal burns in the oxygen jet, and the slag generated by the combustion is blown away by the oxygen jet to form a cutting seam. When the cutting gun is working, the control valve sends cooling water into the water inlet pipe 15 to cool the cutting gun. The used cooling water returns to the cutting machine from the water outlet pipe 14. After use, the PLC control system automatically controls the cutting machine to first close the control valve of the high-pressure pure oxygen, then close the control valve of the hydrogen, and finally close the control valve of the preheating oxygen.

[0036] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A flashback-proof cutting gun, comprising a cutting machine, characterized in that: The cutting gun comprises a main pipe (2), one end of the main pipe (2) is provided with a mounting groove, one end of the main pipe (2) is installed with a connecting component (1), one end of the connecting component (1) is installed with a cutting machine, a cutting nozzle (3) is installed in the mounting groove, and a PLC control system is installed on the cutting machine.

2. The anti-flashback cutting gun according to claim 1, characterized in that: The connection assembly (1) comprises a cutting oxygen pipe (11), a gas pipe (12), a preheating oxygen pipe (13), a water outlet pipe (14) and a water inlet pipe (15); one end of the cutting oxygen pipe (11), the gas pipe (12), the preheating oxygen pipe (13), the water outlet pipe (14) and the water inlet pipe (15) is installed on a cutting machine; the other ends of the cutting oxygen pipe (11), the gas pipe (12), the preheating oxygen pipe (13), the water outlet pipe (14) and the water inlet pipe (15) are installed on a main pipe (2); the gas pipe (12), the preheating oxygen pipe (13), the water outlet pipe (14) and the water inlet pipe (15) are located around the cutting oxygen pipe (11); a water tank is provided inside the main pipe (2); the water outlet pipe (14) and the water inlet pipe (15) are connected to the water tank.

3. The anti-flashback cutting gun according to claim 2, characterized in that: The pipe size of the gas pipe (12) is larger than the pipe size of the preheating oxygen pipe (13), the pipe sizes of the cutting oxygen pipe (11) and the gas pipe (12) are the same, and the pipe sizes of the preheating oxygen pipe (13), the water outlet pipe (14) and the water inlet pipe (15) are the same.

4. A cutting nozzle, characterized in that: An anti-flashback cutting gun applied to claim 1, wherein the cutting nozzle (3) comprises a cutting nozzle shell (31), the cutting nozzle shell (31) is installed in a mounting groove, a sealing ring (35) is provided on the outer surface of the cutting nozzle shell (31), and a main cutting oxygen chamber (32), a hydrogen chamber (33) and a mixed gas chamber (34) are sequentially provided inside the cutting nozzle shell (31) from the inside to the outside, the main cutting oxygen chamber (32) comprises a compression section (321) and a diffusion section (322), the diffusion section (322) is installed below the compression section (321), and the compression section (321) is connected to a cutting oxygen pipe (11).

5. A cutting nozzle according to claim 4, characterized in that: The hydrogen chamber (33) comprises a hydrogen inlet chamber (332) and a hydrogen outlet chamber (331); one end of the hydrogen inlet chamber (332) is in communication with the fuel gas pipe (12); the other end of the hydrogen inlet chamber (332) is in communication with the hydrogen outlet chamber (331); and the hydrogen outlet chamber (331) is arranged between the diffusion section (322) and the mixed gas chamber (34).

6. A cutting nozzle according to claim 5, characterized in that: The mixed gas chamber (34) comprises a hydrogen inlet chamber (342), one end of which is in communication with the fuel gas pipe (12), and the other end of which is provided with a mixed gas outlet chamber (341), the mixed gas outlet chamber (341) being located outside the hydrogen outlet chamber (331), and the other side of which is provided with an oxygen inlet chamber (343), and one end of which is in communication with the preheating oxygen pipe (13).

7. A cutting nozzle according to claim 6, characterized in that: The sealing angle of the sealing ring (35) is 30°5′1.8″.

8. A cutting nozzle according to claim 7, characterized in that: The hydrogen outlet cavity (331) and the mixed gas outlet cavity (341) are arranged in a herringbone shape.

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