Laser cutting gas path system and laser cutting apparatus

Abstract

The application discloses a laser cutting gas path system and a laser cutting device. The laser cutting gas path system comprises at least one gas pipeline, a proportional valve and a cutting head. The gas pipeline comprises a gas source, a gas filter, a solenoid valve and a check valve connected in sequence. The inlet of the proportional valve is connected with the outlet of the check valve of each gas pipeline and communicates with one gas pipeline, and the proportional valve is used for adjusting the gas pressure of the gas output by the gas pipeline. The gas path inlet of the cutting head is connected with the outlet of the proportional valve. One or more gas pipelines share one proportional valve, the structural complexity of the laser cutting gas path system is simplified, and the system hardware cost and maintenance difficulty are effectively reduced under the premise of ensuring that the gas pressure can be normally and accurately adjusted.

Description

Technical Field

[0001] This application relates to the field of laser cutting technology, and in particular to a laser cutting gas path system and laser cutting equipment. Background Technology

[0002] During laser cutting, the required cutting gas and pressure vary depending on the material and thickness of the workpiece. To ensure cutting quality, the pressure of the cutting gas system needs to be controlled. In related technologies, each gas line is independently equipped with a proportional valve to regulate the pressure of different gases. This approach suffers from high hardware costs and a complex gas path structure. The problems are particularly pronounced in scenarios requiring support for two, three, or more gas lines. Utility Model Content

[0003] This application provides a laser cutting gas path system and a laser cutting device. Under the premise of ensuring that the gas pressure can be adjusted normally and accurately, the structural complexity of the laser cutting gas path system is simplified, and the system hardware cost and maintenance difficulty are effectively reduced.

[0004] The laser cutting gas path system proposed in this application includes:

[0005] At least one gas pipeline, each of which includes a gas source, a gas filter, a solenoid valve and a check valve connected in sequence;

[0006] A proportional valve, the inlet of which is connected to the outlet of the check valve in each of the gas pipelines and is in communication with one of the gas pipelines, the proportional valve being used to regulate the gas pressure output from the gas pipeline; and

[0007] The cutting head has its air inlet connected to the outlet of the proportional valve.

[0008] Optionally, at least one gas pipeline may use nitrogen as its gas source.

[0009] Optionally, at least one gas pipeline may contain oxygen as its gas source.

[0010] Optionally, the gas pipeline with oxygen as the gas source also includes a pressure reducing valve, one end of which is connected to the filter and the other end of which is connected to the solenoid valve.

[0011] Optionally, the gas pipeline where the gas source is oxygen also includes a pressure switch, which is connected to the pressure reducing valve and the solenoid valve.

[0012] Optionally, the laser cutting gas path system includes a gas path switching device, which is connected to the one-way valve and the proportional valve of each gas pipeline. When the laser cutting gas path system includes at least two gas pipelines, the gas path switching device is used to switch one of the gas pipelines to be connected to the proportional valve.

[0013] Optionally, when the laser cutting gas path system includes two gas pipelines, the gas path switching device is a three-way valve, the two inlets of the three-way valve are respectively connected to the one-way valves of the two gas pipelines, and the outlet of the three-way valve is connected to the proportional valve.

[0014] Optionally, the laser cutting gas path system further includes a control device electrically connected to the solenoid valve and the proportional valve.

[0015] This application also provides a laser cutting device, including a bed and a laser cutting gas path system as described in any of the above embodiments, wherein the laser cutting gas path system is disposed on the bed, and the cutting head of the laser cutting gas path system is used to process the workpiece to be processed on the bed.

[0016] The laser cutting gas path system and laser cutting equipment provided in this application embodiment, when the laser cutting gas path system includes only one gas pipeline, the proportional valve can be used to adjust the gas pressure of the gas output from the gas pipeline and deliver the adjusted gas to the cutting head; when the laser cutting gas path system includes multiple gas pipelines, the multiple gas pipelines share one proportional valve, which simplifies the structural complexity of the laser cutting gas path system and effectively reduces the system hardware cost and maintenance difficulty while ensuring that the gas pressure can be adjusted normally and accurately. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the laser cutting gas path system provided in the embodiments of this application.

[0019] Explanation of icon numbers:

[0020] Laser cutting gas system 100, gas pipeline 10; proportional valve 20, cutting head 30, gas switching device 40, three-way valve 41;

[0021] 11. Gas source, 12. Gas filter, 13. Solenoid valve, 14. Check valve, 15. Oxygen pressure regulator, 16. Pressure switch.

[0022] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0024] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0025] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0026] It should be understood that the term "and / or" as used in this application specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0028] See Figure 1 , Figure 1This is a schematic diagram of the structure of a laser cutting gas path system 100 provided in an embodiment of this application. The laser cutting gas path system 100 proposed in this application includes at least one gas pipeline 10, a proportional valve 20, and a cutting head 30. Each gas pipeline 10 includes a gas source 11, a gas filter 12, a solenoid valve 13, and a one-way valve 14 connected in sequence. The inlet of the proportional valve 20 is connected to the outlet of the one-way valve 14 of each gas pipeline 10, and is also connected to one gas pipeline 10. The proportional valve 20 is used to regulate the gas pressure output from the gas pipeline 10. The gas inlet of the cutting head 30 is connected to the outlet of the proportional valve 20.

[0029] In laser cutting, gases are used to improve the quality and efficiency of the cutting process. Gases help to purge molten material and prevent it from re-solidifying on the material surface. Furthermore, gases help cool the material, preventing it from twisting or deforming. Nitrogen, oxygen, and compressed air are commonly used auxiliary gases in laser cutting. The properties of the gases used in cutting are related to the application scenario; the specific gases selected must be chosen based on a comprehensive consideration of factors such as the type of material to be cut and the required cutting quality.

[0030] The number of gas pipelines 10 can be flexibly set according to the complexity of the cutting operation and the type of material. There can be one, two, three, or four pipelines, etc., without any limitation. The gas transported by the gas pipelines 10 can be, but is not limited to, oxygen, nitrogen, air, or argon.

[0031] Taking one of the gas pipelines 10 as an example, the starting end of the gas pipeline 10 is the gas source 11, which can provide various gases required for the cutting operation. The gas output from the gas source 11 first enters the gas filter 12. The gas filter 12 is equipped with multiple layers of filter media of different precision, which can effectively remove particulate impurities, oil stains, etc. contained in the gas, and prevent these impurities from entering the subsequent gas circuit components and affecting the system performance and cutting quality.

[0032] The clean gas filtered by gas filter 12 flows into solenoid valve 13. Solenoid valve 13 is used to control the flow of gas in gas pipeline 10. Solenoid valve 13 can be electrically connected to the control system of the laser cutting equipment. When the control system issues an opening command, the solenoid coil of solenoid valve 13 is energized, generating an electromagnetic force to attract the valve core, allowing gas to pass smoothly. When the control system issues a closing command, the solenoid coil is de-energized, and the valve core closes the gas passage under the action of the return spring, preventing gas from passing through.

[0033] Solenoid valve 13 delivers gas to check valve 14. Check valve 14 ensures unidirectional gas flow in the gas circuit system. When gas shows a reverse flow tendency, the valve core of check valve 14 will quickly close, effectively preventing gas backflow and avoiding equipment failure caused by gas backflow. Installing check valve 14 before proportional valve 20 effectively prevents the mixing of different gases.

[0034] The outlet of the one-way valve 14 is connected to the inlet of the proportional valve 20 of each gas pipeline 10, and is connected to one gas pipeline 10. That is, the inlet of the proportional valve 20 is connected to the outlet of the one-way valve 14 of each gas pipeline 10. Regardless of whether the gas pipeline 10 is single-line or multi-line, it is only connected to one of them at a time to avoid mixing of multiple gases. When a cutting task is required, one gas pipeline 10 is selected to be connected to the proportional valve 20 according to the cutting requirements, preventing multiple gases from mixing into the proportional valve 20, which could lead to a decrease in cutting quality or even safety hazards such as potential explosions.

[0035] The proportional valve 20 is used to precisely regulate the gas pressure and provide feedback on the regulated pressure value, delivering gas at the appropriate pressure to the cutting head 30. The proportional valve 20 may include a pressure sensor and a control circuit. When different cutting processes are required, corresponding target gas pressure parameters are set. The control circuit compares these parameters with the current gas pressure value fed back in real time by the pressure sensor, and adjusts the valve core opening of the proportional valve 20 to regulate the gas pressure output from the gas pipeline 10.

[0036] The outlet of the proportional valve 20 is connected to the gas inlet of the cutting head 30, which serves as the terminal execution component of the laser cutting gas system 100. The gas pressure regulated by the proportional valve 20 is ejected from the cutting head 30, forming an airflow in the cutting area to remove molten slag, assist combustion, and cool the material, thus cooperating with the laser beam to complete the cutting operation.

[0037] The laser cutting gas path system 100 provided in this application can be configured with one or more gas pipelines 10 according to the specific cutting task, and one gas pipeline 10 can be selected to deliver the corresponding gas to the cutting head 30.

[0038] When the laser cutting gas system 100 has only one gas line 10, the gas line 10 can deliver oxygen, nitrogen, or air. The proportional valve 20 can adjust the gas pressure to suit the cutting requirements of different materials.

[0039] When the laser cutting gas system 100 is equipped with multiple gas lines 10, each gas line 10 can be used to deliver different types of gases. For example, one gas line 10 can deliver oxygen for the anodizing of carbon steel, while another gas line 10 can deliver nitrogen for the non-anodizing cutting of stainless steel. All gas lines 10 share the same proportional valve 20, and only one gas line 10 is connected to the proportional valve 20. This prevents the mixing of different gases and effectively reduces the hardware cost and system complexity of the laser cutting gas system 100, avoiding the installation space requirements and maintenance burden associated with multiple proportional valves. In the laser cutting gas path system 100 provided in this application embodiment, when the laser cutting gas path system 100 includes only one gas pipeline 10, the proportional valve 20 can adjust the gas pressure according to different cutting requirements and deliver the adjusted gas to the cutting head 30; when the laser cutting gas path system 100 includes multiple gas pipelines 10, the multiple gas pipelines 10 share a proportional valve 20, which ensures that the gas pressure output by the gas pipeline 10 can be normally adjusted, while also simplifying the gas path structure of the entire system and reducing costs.

[0040] Optionally, at least one gas pipeline 10 may contain nitrogen as the gas source 11.

[0041] Gas source 11 provides a stable supply of nitrogen to the gas pipeline. As an inert gas, nitrogen's main function is to isolate oxygen and prevent oxidation, so that the cutting process is in a pure molten state. Therefore, nitrogen is suitable for processing metal materials with high requirements for cutting surface quality, such as stainless steel and aluminum alloys.

[0042] The nitrogen gas supplied from gas source 11 first enters filter 12. Filter 12 has a multi-layer filtration structure, which can efficiently remove small particulate impurities, moisture, and residual oil and gas contaminants that may be present in the nitrogen gas.

[0043] Nitrogen gas, purified by filter 12, flows into solenoid valve 13. Solenoid valve 13 can be electrically connected to the control system of the laser cutting equipment, receiving control commands to control the flow of nitrogen. Before the cutting operation begins, it is first determined whether nitrogen is needed. If nitrogen is required, the control system sends an opening signal to solenoid valve 13, opening the nitrogen passage and allowing nitrogen to flow smoothly. When the cutting process ends or nitrogen is no longer needed, the control system sends a closing signal, de-energizing the solenoid coil of solenoid valve 13. The valve core closes the passage under the action of the return spring, cutting off the nitrogen supply.

[0044] Nitrogen gas continues to flow through solenoid valve 13 to check valve 14. When nitrogen gas flows in the forward direction, check valve 14 opens, allowing nitrogen gas to pass smoothly. When nitrogen gas backflow occurs, check valve 14 closes to prevent gas backflow. This avoids damage to solenoid valve 13, filter 12, etc., caused by nitrogen backflow, and also prevents gas cross-flow between different gas paths, ensuring the stability and reliability of the gas pipeline 10 with nitrogen gas source 11.

[0045] The outlet of the one-way valve 14 is connected to the inlet of the proportional valve 20, which can precisely regulate the nitrogen pressure output from the gas pipeline 10, where the gas source 11 is nitrogen. The nitrogen pressure can be adjusted to the corresponding value based on the type and thickness of the material to be cut and the specific cutting process requirements. For example, when cutting thicker aluminum alloy sheets, higher pressure nitrogen is needed to effectively remove the molten slag generated during cutting, and the proportional valve 20 will automatically increase the nitrogen pressure; while when cutting thinner aluminum alloy sheets, to avoid material deformation due to excessive pressure, the proportional valve 20 will correspondingly reduce the nitrogen pressure.

[0046] Optionally, at least one gas pipeline 10 may have an oxygen source 11. The gas source 11 provides a stable supply of oxygen to the gas pipeline 10. Oxygen is a typical combustion-supporting gas that can undergo a violent oxidation reaction with metals and release heat. It is mainly used for carbon steel cutting.

[0047] Oxygen supplied from gas source 11 flows into filter 12. Filter 12 employs a multi-layer filtration structure, effectively removing particulate impurities, oil, moisture, and other contaminants from the oxygen. The purified oxygen then enters solenoid valve 13.

[0048] Solenoid valve 13 can be electrically connected to the control system of the laser cutting equipment to receive control commands and control the oxygen supply. Before the cutting operation begins, it is first determined whether oxygen is needed. If oxygen is required for the cutting task, the control system sends an opening signal to solenoid valve 13, opening the oxygen channel and allowing oxygen to pass through smoothly. When the cutting process ends or oxygen is no longer needed, the control system sends a closing signal, de-energizing the solenoid coil of solenoid valve 1. The valve core closes the channel under the action of the return spring, cutting off the oxygen supply.

[0049] Oxygen continues to flow through solenoid valve 13 to check valve 14. When oxygen flows in the forward direction, check valve 14 opens, allowing oxygen to pass smoothly. When oxygen backflow occurs, check valve 14 closes to prevent gas backflow. This prevents oxygen backflow from damaging solenoid valve 13, filter 12, etc., and also prevents gas cross-flow between different gas paths, ensuring the stability and reliability of the gas pipeline 10, where the gas source 11 is oxygen.

[0050] The outlet of the one-way valve 14 is connected to the inlet of the proportional valve 20, which can precisely regulate the oxygen pressure output from the gas pipeline 10, where the gas source 11 is oxygen. The oxygen pressure can be adjusted to the corresponding value according to the type and thickness of the material to be cut and the specific cutting process requirements. For example, when cutting thicker carbon steel plates, higher oxygen pressure is required to maintain a vigorous oxidation reaction and effectively remove molten slag; therefore, the proportional valve 20 will automatically increase the oxygen pressure. Conversely, when cutting thinner carbon steel materials, to prevent material deformation or excessively wide cuts due to excessive pressure, the proportional valve 20 will correspondingly reduce the oxygen pressure.

[0051] Optionally, in the gas pipeline 10 where the gas source 11 is oxygen, a pressure reducing valve 15 is also included, one end of which is connected to the filter 12 and the other end is connected to the solenoid valve 13.

[0052] Thus, when the output pressure of the oxygen source 11 fluctuates, the pressure reducing valve 15 can first stabilize and control the oxygen pressure within a pressure range suitable for laser cutting of carbon steel, avoiding damage to the cutting equipment due to excessive pressure, and providing stable and suitable oxygen pressure conditions for the laser cutting equipment.

[0053] It should be noted that both nitrogen and oxygen supplied from the gas cylinder are high-pressure gases. In carbon steel cutting, oxygen primarily utilizes the heat generated by its vigorous oxidation reaction with the high-temperature metal to assist in the cutting process. Therefore, oxygen requires low pressure and a small flow rate during cutting. Using high-pressure oxygen directly from the cylinder would make the cutting process difficult to control due to excessive pressure, and could even cause deformation of the cutting area due to the strong airflow, or damage to the cutting equipment.

[0054] Therefore, a pressure reducing valve 15 is installed in the gas pipeline 10 where the gas source 11 is oxygen to reduce the high-pressure oxygen output from the gas tank to a low-pressure range, so that the subsequent proportional valve 20 can further adjust the oxygen pressure to a precise range.

[0055] It should be noted that in the gas pipeline 10 where the gas source 11 is oxygen, the oxygen first enters the filter 12 and then the pressure reducing valve 15. After the oxygen is output from the gas source 11, it first enters the filter 12, whose internal multi-layer filtration structure will intercept particulate impurities, oil stains, moisture and other contaminants. The filtration process may cause fluctuations in oxygen pressure.

[0056] If the pressure reduction and filtration sequence is adopted, the oxygen that has been adjusted to the preset pressure range by the pressure reducing valve 15 may have its pressure changed after passing through the filter 12 due to the resistance generated by filtration, causing the actual output pressure to deviate from the preset value.

[0057] In the laser cutting gas system 100 of this application, the gas is filtered first and then depressurized, which ensures that the pressure reducing valve 15 regulates the oxygen pressure after impurities have been removed. Based on the pressure fluctuations after filtration, targeted adjustments are made to stabilize the oxygen pressure within the pressure range suitable for laser cutting carbon steel, providing a stable pressure basis for the precise control of the subsequent solenoid valve 13 and proportional valve.

[0058] Optionally, the gas pipeline 10, where the gas source 11 is oxygen, also includes a pressure switch 16, which is connected to a pressure reducing valve 15 and a solenoid valve 13. The addition of the pressure switch 16 to the gas pipeline 10, where the gas source 11 is oxygen, ensures that the oxygen pressure remains within a suitable range, guaranteeing cutting quality and equipment safety.

[0059] Pressure switch 16 monitors oxygen pressure in real time. If the pressure is too high, it immediately cuts off the gas supply to prevent high-pressure oxygen from impacting the cutting head 30 and causing a safety accident. When the pressure is too low, it also issues an alarm and shuts off the gas supply to prevent problems such as low cutting efficiency or poor cut quality due to insufficient pressure. The outlet of pressure switch 16 is connected to the inlet of solenoid valve 13. Pressure switch 16 only opens the gas supply when the oxygen pressure is within the preset normal operating range, allowing oxygen to flow smoothly to solenoid valve 13.

[0060] Optionally, the laser cutting gas system 100 includes a gas switching device 40, which is connected to a one-way valve 14 and a proportional valve 20 of each gas pipeline 10. When the laser cutting gas system 100 includes at least two gas pipelines 10, the gas switching device 40 is used to switch one of the gas pipelines 10 to be connected to the proportional valve 20. Integrating at least two gas pipelines 10 into the switching node of the gas switching device 40 reduces pipeline redundancy and the number of interfaces, making the gas system more compact and easier to maintain.

[0061] The gas path switching device 40 can switch between multiple gas pipelines 10 according to different cutting materials and process requirements, ensuring that only the gas suitable for the current cutting task can enter the cutting head 30 through the gas path, thereby improving the processing flexibility and production efficiency of the equipment. At the same time, it can also effectively prevent different gases from mixing in the gas pipelines 10, avoiding the decline in cutting quality or safety hazards caused by gas mixing, and ensuring the safety and stability of the gas path system operation.

[0062] The inlet of the gas path switching device 40 is connected to the outlet of the one-way valve 14. The number of inlets of the gas path switching device 40 is the same as the number of gas lines 10, and each inlet is connected to a one-way valve 14 of one gas line 10. The outlet of the gas path switching device 40 is connected to the inlet of the proportional valve 20.

[0063] Optionally, when the laser cutting gas system 100 includes two gas lines 10, the gas switching device 40 is a three-way valve 41. The two inlets of the three-way valve 41 are respectively connected to the one-way valves 14 of the two gas lines 10, and the outlet of the three-way valve 41 is connected to the proportional valve 20. In this way, the three-way valve 41 enables the laser cutting gas system 100 to quickly switch between the two gas lines 10 by switching the gas channels, thus meeting diverse processing needs.

[0064] Depending on the processing task, the valve core inside the three-way valve 41 actuates, connecting the corresponding gas pipeline 10. This allows the gas in the gas pipeline 10 to flow to the cutting head 30 after being regulated by the subsequent proportional valve 20. Furthermore, the three-way valve 41 has a built-in mechanical or electronic interlock mechanism to ensure that the two gas pipelines 10 do not operate simultaneously during switching, preventing the mixing of two different gases in the pipeline. Gas mixing can lead to a decrease in cutting quality and even pose safety hazards under high pressure.

[0065] In one embodiment, the laser cutting gas system 100 includes two gas lines 10. One gas line 10 has an oxygen gas source 11, referred to herein as the oxygen gas line; the other gas line 10 has a nitrogen gas source 11, referred to herein as the nitrogen gas line. One inlet of the three-way valve 41 is connected to the one-way valve 14 of the oxygen gas line, the other inlet is connected to the one-way valve 14 of the nitrogen gas line, and the outlet is connected to the inlet of the proportional valve 20.

[0066] When carbon steel needs to be cut, i.e., when oxygen is required, the solenoid valve 13 of the nitrogen gas pipeline is closed. In the oxygen gas pipeline, the oxygen output from the gas source 11 is filtered by the filter 12 and then sent to the pressure reducing valve 15. The depressurized oxygen is then sent to the pressure switch 16, which delivers oxygen that meets the pressure requirements to the solenoid valve 13. The solenoid valve 13 opens, and the three-way valve 41 connects the oxygen gas pipeline. The oxygen is then sent to the proportional valve 20 via the one-way valve 14 and the three-way valve 41. The proportional valve 20 delivers the pressure-regulated oxygen to the cutting head 30, which works in conjunction with the laser beam to complete the oxidation cutting operation of the carbon steel.

[0067] When stainless steel needs to be cut, i.e., when nitrogen is required, the solenoid valve 13 of the oxygen gas pipeline is closed. In the nitrogen gas pipeline, the nitrogen output from the gas source 11 is filtered by the filter 12 and then delivered to the solenoid valve 13. The solenoid valve 13 opens, and the three-way valve 41 connects to the nitrogen gas pipeline. The nitrogen is delivered to the proportional valve 20 through the one-way valve 14 and the three-way valve 41. The proportional valve 20 delivers the pressure-regulated nitrogen to the cutting head 30. The nitrogen is ejected at high speed from the cutting head 30, isolating the material from air and preventing oxidation, thus achieving oxidation-free cutting of stainless steel.

[0068] Optionally, the laser cutting gas system 100 also includes a control device electrically connected to the solenoid valve 13 and the proportional valve 20. Through its connection and coordinated operation with the solenoid valve 13 and the proportional valve 20, the control device automates the on / off switching of gas in the gas pipeline 10 and the automatic adjustment of gas pressure in the gas pipeline 10, greatly improving the efficiency and stability of the cutting operation.

[0069] Specifically, the control device is electrically connected to the solenoid valve 13. When the control device issues an opening command, the solenoid coil of the solenoid valve 13 is energized, generating an electromagnetic force to attract the valve core, allowing gas to pass through smoothly. When the control device issues a closing command, the solenoid coil is de-energized, and the valve core closes the gas passage under the action of the return spring, preventing gas from passing through.

[0070] The control device is electrically connected to the proportional valve 20. The control device obtains the required target gas pressure parameters according to the cutting process and converts these parameters into a corresponding voltage signal, which is then sent to the proportional valve 20. The electromagnetic drive mechanism inside the proportional valve 20 adjusts the valve core opening based on the signal strength, stabilizing the gas pressure at the target pressure value to meet the corresponding cutting requirements.

[0071] This application also provides a laser cutting device, including a machine bed and a laser cutting gas path system 100 according to any of the above embodiments. The laser cutting gas path system 100 is disposed on the machine bed, and the cutting head 30 of the laser cutting gas path system 100 is used to process the workpiece to be processed on the machine bed. Since the laser cutting device of this application uses the aforementioned laser cutting gas path system 100, it at least has the beneficial effects of the aforementioned laser cutting gas path system 100, which will not be repeated here.

[0072] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A laser cutting gas path system, characterized in that, include: At least one gas pipeline, each of which includes a gas source, a gas filter, a solenoid valve and a check valve connected in sequence; A proportional valve, the inlet of which is connected to the outlet of the one-way valve of each gas pipeline and is connected to one of the gas pipelines, the proportional valve being used to regulate the gas pressure output by the gas pipeline. as well as The cutting head has its air inlet connected to the outlet of the proportional valve.

2. The laser cutting gas path system according to claim 1, characterized in that, At least one gas pipeline must use nitrogen as its gas source.

3. The laser cutting gas path system according to any one of claims 1 or 2, characterized in that, At least one gas pipeline must contain oxygen as its gas source.

4. The laser cutting gas path system according to claim 3, characterized in that, The gas pipeline, whose gas source is oxygen, also includes a pressure reducing valve, one end of which is connected to the filter and the other end of which is connected to the solenoid valve.

5. The laser cutting gas path system according to claim 4, characterized in that, The gas pipeline, whose gas source is oxygen, also includes a pressure switch, which is connected to the pressure reducing valve and the solenoid valve.

6. The laser cutting gas path system according to claim 1, characterized in that, The laser cutting gas path system includes a gas path switching device, which is connected to the one-way valve and the proportional valve of each gas pipeline. When the laser cutting gas path system includes at least two gas pipelines, the gas path switching device is used to switch one of the gas pipelines to be connected to the proportional valve.

7. The laser cutting gas path system according to claim 6, characterized in that, When the laser cutting gas path system includes two gas pipelines, the gas path switching device is a three-way valve. The two inlets of the three-way valve are respectively connected to the one-way valves of the two gas pipelines, and the outlet of the three-way valve is connected to the proportional valve.

8. The laser cutting gas path system according to claim 1, characterized in that, The laser cutting gas path system also includes a control device electrically connected to the solenoid valve and the proportional valve.

9. A laser cutting device, characterized in that, include: Bed frame; The laser cutting gas path system according to any one of claims 1-8, wherein the laser cutting gas path system is disposed on the bed, and the cutting head of the laser cutting gas path system is used to process the workpiece to be processed on the bed.

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