CN111531258A - Plasma cutting machine with double-way gas supply pipeline - Google Patents
Plasma cutting machine with double-way gas supply pipeline Download PDFInfo
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- CN111531258A CN111531258A CN202010414036.XA CN202010414036A CN111531258A CN 111531258 A CN111531258 A CN 111531258A CN 202010414036 A CN202010414036 A CN 202010414036A CN 111531258 A CN111531258 A CN 111531258A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K10/00—Welding or cutting by means of a plasma
Abstract
The invention relates to a plasma cutting machine with a double-way gas supply pipeline. The first end of a first gas supply pipeline of the plasma cutting machine is communicated with a gas inlet of the plasma cutting machine, and the second end of the first gas supply pipeline is communicated with a gas inlet of the gun head; the first end of the second gas supply pipeline is communicated with the gas inlet of the plasma cutting machine, and the second end of the second gas supply pipeline is communicated with the gas inlet of the gun head; the first electromagnetic valve is positioned on the first gas supply pipeline, and the second electromagnetic valve is positioned on the second gas supply pipeline. The control circuit board controls the first electromagnetic valve and the second electromagnetic valve to be switched on and off, the gas flow of the first electromagnetic valve is smaller than that of the second electromagnetic valve, the pressure sensor sends the detected gas pressure value to the control circuit board, and the control circuit board controls the power supply module and the gun head to form electric arcs after the gas pressure value meets preset conditions. The invention uses the double-path gas supply pipeline to flexibly adjust and realize the high-efficiency cutting of thin plate materials, thick plate materials and net materials, thereby improving the cutting efficiency and saving the cutting cost.
Description
Technical Field
The invention relates to the field of plasma cutting machines, in particular to a plasma cutting machine with a double-way gas supply pipeline.
Background
At present, tools for steel cutting are mainly divided into flame cutting, laser cutting and plasma cutting, and the plasma cutting is more and more accepted by the market due to the characteristics of small size, high safety, high efficiency and the like. Plasma cutting machine adopts contact cutting more, produces electric arc after cutting torch and steel contact, and then guarantee the cutting through the air of the fixed flow of access, but this cutting mode is when cutting thick steel and netted steel, and the rifle mouth loss that appears cutting torch is too big. Especially, when cutting the net-shaped steel, the arc breaking phenomenon is easy to occur due to the hollow part of the net-shaped steel, so that the cutting efficiency is greatly reduced.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a plasma cutting machine with a two-way gas supply pipeline, which addresses the above-mentioned drawbacks of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: the plasma cutting machine with the two gas supply pipelines comprises a gun head for generating a plasma arc and a power supply module for supplying power to the gun head, and further comprises a first gas supply pipeline, a second gas supply pipeline, a first electromagnetic valve, a second electromagnetic valve, a control circuit board and a pressure sensor;
the first end of the first gas supply pipeline is communicated with the gas inlet of the plasma cutting machine, and the second end of the first gas supply pipeline is communicated with the gas inlet of the gun head; the first end of the second gas supply pipeline is communicated with the gas inlet of the plasma cutting machine, and the second end of the second gas supply pipeline is communicated with the gas inlet of the gun head; the pressure sensor is arranged in the air inlet pipeline of the gun head and is used for detecting the air pressure value in the air inlet pipeline of the gun head; the first electromagnetic valve is positioned on the first gas supply pipeline, and the second electromagnetic valve is positioned on the second gas supply pipeline;
the control circuit board is respectively in communication connection with the first electromagnetic valve and the second electromagnetic valve and is used for controlling the on-off of the first electromagnetic valve and the second electromagnetic valve, and the gas flow of the first electromagnetic valve is smaller than that of the second electromagnetic valve; the control circuit board is in communication connection with the pressure sensor, the pressure sensor sends a detected gas pressure value to the control circuit board, and the control circuit board controls the power supply module and the torch head to form an electric arc after the gas pressure value meets a preset condition.
Further, in the plasma cutting machine with a two-way gas supply pipeline, the step of controlling the torch head to form an arc by the control circuit board after the gas pressure value meets the preset condition includes:
if the first electromagnetic valve is opened and the second electromagnetic valve is closed, the control circuit board controls the gun head to form an electric arc after the gas pressure value meets a first preset condition;
if the first electromagnetic valve is closed and the second electromagnetic valve is opened, the control circuit board controls the gun head to form an electric arc after the gas pressure value meets a second preset condition;
and if the first electromagnetic valve is opened and the second electromagnetic valve is opened, the control circuit board controls the gun head to form an electric arc after the gas pressure value meets a third preset condition.
Further, in the plasma cutting machine with a two-way gas supply pipeline according to the present invention, if the thickness of the material to be cut is less than the preset thickness value, a thin plate cutting mode is performed:
s11, before contacting with the material to be cut, opening the first electromagnetic valve, and allowing gas to flow into the gun head through the first electromagnetic valve;
s12, detecting a gas pressure value by the pressure sensor, and controlling the torch head to form a holding arc by the control circuit board after the gas pressure value meets a first preset condition;
s13, after contacting the material to be cut, closing the first electromagnetic valve and opening the second electromagnetic valve, and allowing gas to flow into the gun head through the second electromagnetic valve;
and S14, detecting a gas pressure value by the pressure sensor, and controlling the gun head to form a cutting electric arc by the control circuit board after the gas pressure value meets a second preset condition so as to cut the material to be cut.
Further, in the plasma cutting machine with a two-way gas supply pipeline according to the present invention, if the thickness of the material to be cut is greater than the preset thickness value, a thick plate cutting mode is performed:
s21, before contacting with the material to be cut, opening the first electromagnetic valve, and allowing gas to flow into the gun head through the first electromagnetic valve;
s22, detecting a gas pressure value by the pressure sensor, and controlling the torch head to form a holding arc by the control circuit board after the gas pressure value meets a first preset condition;
s23, opening the second electromagnetic valve after contacting the material to be cut, and allowing gas to flow into the gun head through the first electromagnetic valve and the second electromagnetic valve;
and S24, detecting a gas pressure value by the pressure sensor, and controlling the gun head to form a cutting electric arc by the control circuit board after the gas pressure value meets a third preset condition so as to cut the material to be cut.
Further, the plasma cutting machine with the two-way gas supply pipeline comprises a thickness detection unit which is connected with the control circuit board and is used for detecting the thickness of the material to be cut.
Further, in the plasma cutting machine with a two-way gas supply pipeline according to the present invention, if the material to be cut is a mesh structure including a mesh frame and a hollow portion, a mesh cutting mode is performed:
s31, before contacting with the material to be cut, opening the first electromagnetic valve, and allowing gas to flow into the gun head through the first electromagnetic valve;
s32, detecting a gas pressure value by the pressure sensor, and controlling the torch head to form a holding arc by the control circuit board after the gas pressure value meets a first preset condition;
s33, after contacting with the mesh bone of the material to be cut, closing the first electromagnetic valve and opening the second electromagnetic valve, wherein the gas flows into the torch head through the second electromagnetic valve, and the control circuit board controls the torch head to form a cutting electric arc to cut the material to be cut;
s34, after cutting of the current mesh bone is finished, the current mesh bone enters a hollowed-out part of a material to be cut, the first electromagnetic valve is opened, the second electromagnetic valve is closed, and the control circuit board controls the gun head to enter an electric arc maintaining state;
s35, repeating the step S33 and the step S34 until the material to be cut is cut.
Further, in the plasma cutting machine with the two-way gas supply pipeline, the control circuit board comprises a current detection unit, and the current detection unit judges that the current position of the gun head is the mesh frame or the hollow part by detecting the working current of the gun head.
Further, in the plasma cutting machine with the two-way gas supply pipeline, the current detection unit is a current hall sensor.
Further, in the plasma cutting machine with the two-way gas supply pipeline, the control circuit board controls the power supply module to stop supplying power to the gun head after the material to be cut is cut, and the opened first electromagnetic valve and/or the opened second electromagnetic valve are/is closed after the preset cooling time is delayed.
Further, in the plasma cutting machine with two gas supply pipelines, the first electromagnetic valve is an air pressure adjustable electromagnetic valve, and the control circuit board adjusts the air input of the first gas supply pipeline by adjusting the air pressure of the first electromagnetic valve;
the second electromagnetic valve is an air pressure adjustable electromagnetic valve, and the control circuit board adjusts the air input of the second air supply pipeline by adjusting the air pressure of the second electromagnetic valve.
The plasma cutting machine with the double-path gas supply pipeline has the following beneficial effects that: the invention uses the double-path gas supply pipeline to flexibly adjust and realize the high-efficiency cutting of thin plate materials, thick plate materials and net materials, thereby improving the cutting efficiency and saving the cutting cost.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic structural view of a plasma cutting machine with a two-way gas supply pipeline provided in embodiment 1;
FIG. 2 is a flow chart of a sheet cutting mode provided in example 2;
FIG. 3 is a flowchart of the slab cutting mode provided in example 3;
FIG. 4 is a flowchart of a mesh cutting mode provided in example 4;
fig. 5 is a schematic structural diagram of the mesh structure provided in example 4.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Example 1
Referring to fig. 1, the plasma cutting machine with a two-way gas supply pipeline according to this embodiment includes a torch head 101 for generating a plasma arc and a power supply module 102 for supplying power to the torch head 101, and the torch head 101 and the power supply module 102 may refer to the prior art and are not described herein again. The plasma cutting machine of the embodiment further comprises a first gas supply pipeline 103, a second gas supply pipeline 104, a first electromagnetic valve 105, a second electromagnetic valve 106, a control circuit board 107 and a pressure sensor 108, wherein a first end of the first gas supply pipeline 103 is communicated with a gas inlet of the plasma cutting machine, and a second end of the first gas supply pipeline 103 is communicated with a gas inlet of the gun head 101; a first end of the second gas supply pipeline 104 is communicated with a gas inlet of the plasma cutting machine, and a second end of the second gas supply pipeline 104 is communicated with a gas inlet of the gun head 101; the pressure sensor 108 is arranged in the gas inlet pipeline of the gun head 101 and is used for detecting the gas pressure value in the gas inlet pipeline of the gun head 101; a first solenoid valve 105 is located on the first gas supply duct 103 and a second solenoid valve 106 is located on the second gas supply duct 104.
The control circuit board 107 is respectively connected to the first solenoid valve 105 and the second solenoid valve 106 in a communication manner, and is used for controlling the on and off of the first solenoid valve 105 and the second solenoid valve 106, wherein the gas flow of the first solenoid valve 105 is smaller than the gas flow of the second solenoid valve 106, that is, the gas flow of the first solenoid valve 105 in an open state is smaller than the gas flow of the second solenoid valve 106 in an open state. The control circuit board 107 is in communication connection with the pressure sensor 108, the pressure sensor 108 sends the detected gas pressure value to the control circuit board 107, and the control circuit board 107 controls the power supply module 102 and the torch head 101 to form an arc after the gas pressure value meets a preset condition. Alternatively, the control circuit board 107 may be composed of a chip and its peripheral circuits, and implemented in cooperation with a control program.
Specifically, according to the difference in the on-off state air input of the first electromagnetic valve 105 and the second electromagnetic valve 106, after the air pressure value meets the preset condition, the control circuit board 107 controls the torch head 101 to form the arc, including:
if the first electromagnetic valve 105 is opened and the second electromagnetic valve 106 is closed, the control circuit board 107 controls the power supply module 102 and the torch head 101 to form an arc when the gas pressure value meets a first preset condition.
If the first electromagnetic valve 105 is closed and the second electromagnetic valve 106 is opened, the control circuit board 107 controls the power supply module 102 and the torch head 101 to form an arc after the gas pressure value meets a second preset condition.
If the first electromagnetic valve 105 is opened and the second electromagnetic valve 106 is opened, the control circuit board 107 controls the power supply module 102 and the torch head 101 to form an arc after the gas pressure value meets a third preset condition.
The air inflow of the first preset condition is smaller than that of the second preset condition, and the air inflow of the second preset condition is smaller than that of the third preset condition.
This embodiment uses the nimble air feed volume of double-circuit air feed pipeline, can provide multiple cutting mode to different materials and shape, promotes cutting efficiency, saves the cutting cost.
Example 2
Referring to fig. 2, on the basis of embodiment 1, the plasma cutting machine with the two-way gas supply pipeline of the present embodiment includes a thickness detection unit connected to the control circuit board 107 and used for detecting the thickness of the material to be cut, and the thickness detection unit is installed in the advancing direction of the torch head 101 to measure the thickness of the material to be cut in advance and send the measured thickness to the control circuit board 107. The thickness detection unit can refer to the prior art, and is not described herein again. The control circuit board 107 determines whether the measured thickness is smaller than a preset thickness value, and if the thickness of the material to be cut is smaller than the preset thickness value, a thin plate cutting mode is executed. Alternatively, the operator may manually measure the thickness of the material to be cut, and manually select the sheet cutting mode. Specifically, the sheet cutting mode of the present embodiment includes the following steps:
s11, before contacting the material to be cut, the first solenoid valve 105 is opened, and the gas flows into the torch head 101 through the first solenoid valve 105, i.e., flows from the side a to the side B of the first solenoid valve 105.
S12, the pressure sensor 108 detects the gas pressure value, and the control circuit board 107 controls the torch head 101 to form a holding arc after the gas pressure value meets the first preset condition. The gas flow required in the arc state is kept small, the arc breaking phenomenon can be prevented, and meanwhile, the energy is saved.
S13, closing the first solenoid valve 105 and opening the second solenoid valve 106 after contacting the material to be cut, the gas flows into the lance tip 101 through the second solenoid valve 106, i.e., from side a to side B of the second solenoid valve 106.
S14, detecting a gas pressure value by the pressure sensor 108, and controlling the torch head 101 to form a cutting arc by the control circuit board 107 after the gas pressure value meets a second preset condition, so as to cut the material to be cut. The driving mechanism for driving the torch head 101 to move in the plasma cutting machine can refer to the prior art, and is not described herein again.
Alternatively, if the thickness of the material to be cut is changed from being smaller than the preset thickness value to being larger than the preset thickness value during the cutting process, the first electromagnetic valve 105 is opened, and the first electromagnetic valve 105 and the second electromagnetic valve 106 are used for supplying air simultaneously.
This embodiment uses the first solenoid valve 105 to provide a small gas flow before contacting the material to be cut and the second solenoid valve 106 to provide a large gas flow when cutting the sheet to meet the cutting requirements.
Example 3
Referring to fig. 3, on the basis of embodiment 1, the plasma cutting machine with the two-way gas supply pipeline of the present embodiment includes a thickness detection unit connected to the control circuit board 107 and used for detecting the thickness of the material to be cut, and the thickness detection unit is installed in the advancing direction of the torch head 101 to measure the thickness of the material to be cut in advance and send the measured thickness to the control circuit board 107. The control circuit board 107 determines whether the measured thickness is smaller than a preset thickness value, and if the thickness of the material to be cut is larger than the preset thickness value, the thick plate cutting mode is executed. Alternatively, the operator may manually measure the thickness of the material to be cut, and manually select the sheet cutting mode. Specifically, the plank cutting mode of the present embodiment includes the following steps:
s21, before contacting the material to be cut, the first solenoid valve 105 is opened, and the gas flows into the torch head 101 through the first solenoid valve 105, i.e., flows from the side a to the side B of the first solenoid valve 105.
S22, the pressure sensor 108 detects the gas pressure value, and the control circuit board 107 controls the torch head 101 to form a holding arc after the gas pressure value meets the first preset condition. The gas flow required in the arc state is kept small, the arc breaking phenomenon can be prevented, and meanwhile, the energy is saved.
S23, after contacting the material to be cut, the second solenoid valve 106 is opened, and the gas flows into the torch head 101 through the first solenoid valve 105 and the second solenoid valve 106, i.e., flows from the side a of the first solenoid valve 105 to the side B, and simultaneously, flows from the side a of the second solenoid valve 106 to the side B.
S24, detecting a gas pressure value by the pressure sensor 108, and controlling the torch head 101 to form a cutting arc by the control circuit board 107 after the gas pressure value meets a third preset condition, so as to cut the material to be cut. The driving mechanism for driving the torch head 101 to move in the plasma cutting machine can refer to the prior art, and is not described herein again.
Alternatively, if the thickness of the material to be cut changes from being greater than the preset thickness value to being less than the preset thickness value during the cutting process, the first electromagnetic valve 105 is closed, and only the second electromagnetic valve 106 is opened for air supply.
In the embodiment, the first electromagnetic valve 105 is used for providing small gas flow before contacting with the material to be cut, and the first electromagnetic valve 105 and the second electromagnetic valve 106 are used for providing large gas flow when the thick plate is cut, so that the requirement of cutting the thick plate is met.
Example 4
Referring to fig. 4 and 5, on the basis of embodiment 1, the control circuit board 107 in the plasma cutting machine with the two-way gas supply pipeline according to this embodiment includes a current detection unit, and the current detection unit determines that the current position of the torch head 101 is the mesh 201 or the hollow part 202 by detecting the working current of the torch head 101; it can be understood that the current position of the lance head 101 is that the working current of the mesh 201 is much larger than the working current of the hollow part 202, so that the current position of the lance head 101 can be determined to be the mesh 201 or the hollow part 202 by detecting the working current. Alternatively, the current detection unit is a current hall sensor. Of course, the thickness detection unit of the above embodiment may also be used to determine that the current position of the lance tip 101 is the mesh frame 201 or the hollow part 202. By the judgment, if the material to be cut is a net structure comprising the net bone 201 and the hollow part 202, the plasma cutting machine executes a net cutting mode, and the net cutting mode comprises the following steps:
s31, before contacting the material to be cut, the first solenoid valve 105 is opened, and the gas flows into the torch head 101 through the first solenoid valve 105, i.e., flows from the side a to the side B of the first solenoid valve 105.
S32, the pressure sensor 108 detects the gas pressure value, and the control circuit board 107 controls the torch head 101 to form a holding arc after the gas pressure value meets the first preset condition. The gas flow required in the arc state is kept small, the arc breaking phenomenon can be prevented, and meanwhile, the energy is saved.
S33, after the cutting torch contacts the mesh bone 201 of the material to be cut, the first electromagnetic valve 105 is closed, the second electromagnetic valve 106 is opened, the gas flows into the torch head 101 through the second electromagnetic valve 106, and the control circuit board 107 controls the torch head 101 to form a cutting arc to cut the material to be cut.
S34, after the cutting of the front mesh frame 201 is finished, the front mesh frame enters the hollow part 202 of the material to be cut, the first electromagnetic valve 105 is opened, the second electromagnetic valve 106 is closed, and the control circuit board 107 controls the gun head 101 to enter an electric arc maintaining state. The gas flow required in the arc maintaining state is small, so that the arc breaking phenomenon can be prevented, and meanwhile, the energy is saved.
And S35, repeatedly executing the step S33 and the step S34 until the material to be cut is cut. The driving mechanism for driving the torch head 101 to move in the plasma cutting machine can refer to the prior art, and is not described herein again.
The embodiment uses the circulation air supply of the first electromagnetic valve 105 and the second electromagnetic valve 106 to realize the targeted air flow supply of the mesh frame 201 and the hollow part 202, so that the cutting efficiency is improved, and the cutting cost is saved.
Alternatively, in some embodiments, after the material to be cut is cut, the control circuit board 107 controls the power supply module 102 to stop supplying power to the torch head 101, and after a preset cooling time is delayed, the opened first electromagnetic valve 105 and/or the opened second electromagnetic valve 106 are closed, that is, the first electromagnetic valve 105 is closed when only the first electromagnetic valve 105 is opened, the second electromagnetic valve 106 is closed when only the second electromagnetic valve 106 is opened, and the first electromagnetic valve 105 and the second electromagnetic valve 106 are closed when both the first electromagnetic valve 105 and the second electromagnetic valve 106 are opened. In the embodiment, the first solenoid valve 105 and the second solenoid valve 106 are closed in a delayed manner after the cutting is completed, so that enough gas is ensured to cool the gun head 101, and the loss of the gun head 101 is reduced.
Alternatively, in the two-way gas supply line plasma cutting machine according to some embodiments, the first solenoid valve 105 is an air pressure adjustable solenoid valve, and the control circuit board 107 adjusts the amount of air taken into the first gas supply line 103 by adjusting the air pressure of the first solenoid valve 105. The second electromagnetic valve 106 is an air pressure adjustable electromagnetic valve, and the control circuit board 107 adjusts the air intake amount of the second air supply duct 104 by adjusting the air pressure of the second electromagnetic valve 106.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (10)
1. A plasma cutting machine with two gas supply pipelines comprises a gun head (101) for generating a plasma arc and a power supply module (102) for supplying power to the gun head (101), and is characterized by further comprising a first gas supply pipeline (103), a second gas supply pipeline (104), a first electromagnetic valve (105), a second electromagnetic valve (106), a control circuit board (107) and a pressure sensor (108);
the first end of the first gas supply pipeline (103) is communicated with the gas inlet of the plasma cutting machine, and the second end of the first gas supply pipeline (103) is communicated with the gas inlet of the gun head (101); the first end of the second gas supply pipeline (104) is communicated with the gas inlet of the plasma cutting machine, and the second end of the second gas supply pipeline (104) is communicated with the gas inlet of the gun head (101); the pressure sensor (108) is arranged in a gas inlet pipeline of the gun head (101) and is used for detecting the gas pressure value in the gas inlet pipeline of the gun head (101); the first solenoid valve (105) is located on the first gas supply duct (103), the second solenoid valve (106) is located on the second gas supply duct (104);
the control circuit board (107) is respectively in communication connection with the first solenoid valve (105) and the second solenoid valve (106) and is used for controlling the on-off of the first solenoid valve (105) and the second solenoid valve (106), and the gas flow of the first solenoid valve (105) is smaller than that of the second solenoid valve (106); the control circuit board (107) is in communication connection with the pressure sensor (108), the pressure sensor (108) sends a detected gas pressure value to the control circuit board (107), and the control circuit board (107) controls the power supply module (102) and the torch head (101) to form an electric arc after the gas pressure value meets a preset condition.
2. The plasma cutting machine with a two-way gas supply pipeline according to claim 1, wherein the step of controlling the torch head (101) to form an arc by the control circuit board (107) after the gas pressure value meets a preset condition comprises:
if the first electromagnetic valve (105) is opened and the second electromagnetic valve (106) is closed, the control circuit board (107) controls the torch head (101) to form an electric arc after the gas pressure value meets a first preset condition;
if the first electromagnetic valve (105) is closed and the second electromagnetic valve (106) is opened, the control circuit board (107) controls the torch head (101) to form an electric arc after the gas pressure value meets a second preset condition;
if the first electromagnetic valve (105) is opened and the second electromagnetic valve (106) is opened, the control circuit board (107) controls the torch head (101) to form an electric arc after the gas pressure value meets a third preset condition.
3. The plasma cutting machine of two-way gas supply duct according to claim 2, characterized in that if the thickness of the material to be cut is less than a preset thickness value, a sheet cutting mode is performed:
s11, opening the first electromagnetic valve (105) before contacting the material to be cut, and enabling gas to flow into the gun head (101) through the first electromagnetic valve (105);
s12, detecting a gas pressure value by the pressure sensor (108), and controlling the torch head (101) to form a holding arc by the control circuit board (107) after the gas pressure value meets a first preset condition;
s13, after contacting the material to be cut, closing the first solenoid valve (105) and opening the second solenoid valve (106), and allowing gas to flow into the gun head (101) through the second solenoid valve (106);
s14, detecting a gas pressure value by the pressure sensor (108), and controlling the gun head (101) to form a cutting arc by the control circuit board (107) after the gas pressure value meets a second preset condition so as to cut the material to be cut.
4. The plasma cutting machine of two-way gas supply duct according to claim 2, characterized in that if the thickness of the material to be cut is greater than a preset thickness value, a thick plate cutting mode is performed:
s21, opening the first electromagnetic valve (105) before contacting the material to be cut, and enabling gas to flow into the gun head (101) through the first electromagnetic valve (105);
s22, detecting a gas pressure value by the pressure sensor (108), and controlling the torch head (101) to form a holding arc by the control circuit board (107) after the gas pressure value meets a first preset condition;
s23, opening the second electromagnetic valve (106) after contacting the material to be cut, and enabling gas to flow into the gun head (101) through the first electromagnetic valve (105) and the second electromagnetic valve (106);
s24, detecting a gas pressure value by the pressure sensor (108), and controlling the gun head (101) to form a cutting arc by the control circuit board (107) after the gas pressure value meets a third preset condition so as to cut the material to be cut.
5. The plasma cutting machine with two-way gas supply duct according to claim 3 or 4, characterized by comprising a thickness detection unit connected with the control circuit board (107) for detecting the thickness of the material to be cut.
6. The plasma cutting machine with two-way gas supply pipeline according to claim 1, characterized in that if the material to be cut is a net structure comprising a net bone (201) and a hollow part (202), a net cutting mode is performed:
s31, opening the first electromagnetic valve (105) before contacting the material to be cut, and enabling gas to flow into the gun head (101) through the first electromagnetic valve (105);
s32, detecting a gas pressure value by the pressure sensor (108), and controlling the torch head (101) to form a holding arc by the control circuit board (107) after the gas pressure value meets a first preset condition;
s33, after contacting with the mesh bone (201) of the material to be cut, closing the first electromagnetic valve (105) and opening the second electromagnetic valve (106), wherein the gas flows into the torch head (101) through the second electromagnetic valve (106), and the control circuit board (107) controls the torch head (101) to form a cutting arc to cut the material to be cut;
s34, after the cutting of the current mesh frame (201) is finished, the current mesh frame enters a hollowed-out part (202) of a material to be cut, the first electromagnetic valve (105) is opened, the second electromagnetic valve (106) is closed, and the control circuit board (107) controls the gun head (101) to enter an arc maintaining state;
s35, repeating the step S33 and the step S34 until the material to be cut is cut.
7. The plasma cutting machine with the two-way air supply pipeline according to claim 6, wherein the control circuit board (107) comprises a current detection unit, and the current detection unit judges that the current position of the lance head (101) is the mesh frame (201) or the hollowed-out part (202) by detecting the working current of the lance head (101).
8. The plasma cutter of two-way gas supply line according to claim 7, wherein the current detecting unit is a current hall sensor.
9. The plasma cutting machine with a two-way gas supply pipeline according to claim 1, characterized in that the control circuit board (107) controls the power supply module (102) to stop supplying power to the torch head (101) after the material to be cut is cut, and closes the opened first solenoid valve (105) and/or the opened second solenoid valve (106) after a preset cooling time is delayed.
10. The plasma cutting machine for two-way gas supply pipelines according to claim 1, characterized in that the first solenoid valve (105) is an air pressure adjustable solenoid valve, and the control circuit board (107) adjusts the air intake amount of the first gas supply pipeline (103) by adjusting the air pressure of the first solenoid valve (105);
the second electromagnetic valve (106) is an air pressure adjustable electromagnetic valve, and the control circuit board (107) adjusts the air inflow of the second air supply pipeline (104) by adjusting the air pressure of the second electromagnetic valve (106).
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| CN201632754U (en) * | 2010-01-13 | 2010-11-17 | 深圳市佳士科技股份有限公司 | Keep-alive device of air plasma cutting machine |
| CN102350579A (en) * | 2011-04-11 | 2012-02-15 | 西安理工大学 | Arc interruption preventing cutting method of air plasma cutter for cutting grid-shaped metal |
| US20160227640A1 (en) * | 2015-01-29 | 2016-08-04 | Kjellberg-Stiftung | Plasma torch |
| CN104889551A (en) * | 2015-06-15 | 2015-09-09 | 济南大学 | Electric current and gas control system and method of fine plasma cutting machine |
| CN205414677U (en) * | 2016-03-14 | 2016-08-03 | 宁夏吴忠市好运电焊机有限公司 | Many pneumatic control contravariant plasma arc cutting machine |
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