A single board arc maintaining plasma cutting machine preventing nozzle burnout

Abstract

The utility model discloses a kind of single board arc maintaining plasma cutting machines of preventing nozzle burnout, including body, the cutting torch cable connected with body, and the cutting torch part connected with cutting torch cable, cutting torch cable includes wear-resistant sheath, wear-resistant sheath is equipped with the cable for electrically connecting cutting torch part with body, wear-resistant sheath is also equipped with air pipe, air pipe is used for gas transmission of cutting torch part, gas control part is installed in air pipe middle section;Gas control part includes the horizontal axis and vertical axis for connecting air pipe, horizontal axis and vertical axis are perpendicular and integral, the inside of vertical axis is equipped with the filter disc for filtering gas, vertical axis outside is equipped with pressure gauge for detecting air pressure.Compared with prior art, the utility model has the advantages that dust and impurities in compressed air are effectively removed by filter disc, nozzle burnout caused by arc partial burning and abnormal electrode loss is reduced, nozzle life is extended, and use cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of plasma cutting machine technology, and in particular to a single-plate arc plasma cutting machine that prevents nozzle burn-out. Background Technology

[0002] Ordinary handheld plasma cutters require contact with the workpiece to ignite the plasma arc before each cut. The "arc-maintaining" function, however, allows the cutter to generate a weak pilot arc before the main plasma arc is drawn out, even without the nozzle contacting the workpiece. This arc-maintaining function avoids damage to the nozzle and electrodes caused by frequent contact, extending the lifespan of these vulnerable components. Furthermore, it eliminates the need to remove paint or rust during arc cutting, as the generated plasma arc can directly penetrate these non-conductive layers.

[0003] Currently, commonly used plasma cutting machines include dual-gas-path and single-gas-path models. In a single-gas-path model, the gas is ionized within the torch to form a high-temperature plasma arc, used to melt the metal and blow away the molten slag. Common gases include air, oxygen, and nitrogen. A second gas path typically involves the gas being ejected from the periphery of the torch nozzle, forming a protective sheath to protect the nozzle from molten slag splashes and cool the torch. Common gases used in this case are air, nitrogen, and an argon-hydrogen mixture. Single-gas-path plasma cutting machines are simple in structure and low in cost, but the nozzle is prone to burnout. One reason for nozzle burnout is the cleanliness of the air and the gas pressure. Dust in the air accelerates electrode wear and clogs the nozzle orifice, causing the arc to burn out and damaging the nozzle. Insufficient gas flow due to low pressure can also lead to arc divergence and nozzle burnout. Utility Model Content

[0004] In view of the problems mentioned above, the technical problem to be solved by this utility model is to provide a single-plate arc plasma cutting machine that prevents nozzle burn-out.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a single-plate arc plasma cutting machine for preventing nozzle burn-out, including a machine body, a cutting torch cable connected to the machine body, and a cutting torch part connected to the cutting torch cable. The cutting torch cable includes a wear-resistant sheath, and a cable for electrically connecting the cutting torch part to the machine body is provided inside the wear-resistant sheath. A gas pipe is also provided inside the wear-resistant sheath. The gas pipe is used to transmit gas for the cutting torch part, and a gas control part is installed in the middle section of the gas pipe. The gas control unit includes a horizontal axis and a vertical axis for connecting the gas pipe. The horizontal axis is perpendicular to the vertical axis and is integral with it. The interior of the vertical axis is equipped with a filter for filtering the gas, and the exterior of the vertical axis is equipped with a pressure gauge for detecting the gas pressure.

[0006] A further preferred embodiment of this utility model is: both ends of the horizontal shaft are rotatably connected with external threaded sleeves, and the ends of the air pipes on both sides near the horizontal shaft are fixed with internal threaded sleeves, and the internal threaded sleeves are threadedly connected to the external threaded sleeves. The horizontal axis is closed in the middle, and both ends of the closed axis have connecting cavities that communicate with the interior of the vertical axis. The openings of the two connecting cavities are located on both sides of the filter, allowing gas to pass through the filter.

[0007] A further preferred embodiment of this utility model is: the inner threaded sleeve is further provided with an inner mating sleeve, the inner mating sleeve is fixed to the end of the air pipe, both ends of the horizontal shaft have a sealing ring, and the inner mating sleeve extends into the outer threaded sleeve and abuts against the sealing ring.

[0008] A further preferred embodiment of this utility model is: the interior of the longitudinal shaft is connected to the outside environment downwards, and an outer cover is detachably fixed at the lower end of the longitudinal shaft. The outer cover has a sealing ring II that presses against the lower end of the longitudinal shaft, and the filter is installed inside the longitudinal shaft from bottom to top.

[0009] A further preferred embodiment of this utility model is that the filter sheet is made of filter element material.

[0010] A further preferred embodiment of this utility model is: the inner wall of the longitudinal shaft has a limiting edge one for clamping the filter sheet, and the inner wall of the outer cover has a limiting edge two for clamping the filter sheet, and the filter sheet is pressed against the longitudinal shaft and the inner wall of the outer cover.

[0011] A further preferred embodiment of this utility model is as follows: two pressure gauges are provided, both located at the lower end of the outer cover. A connecting shaft fixed to the outer cover is fixed on the outside of the pressure gauge. The detection ends of the two connecting shafts extend into the inside of the outer cover and are located on both sides of the filter, respectively, for detecting the air pressure on both sides of the filter.

[0012] A further preferred embodiment of this utility model is: a detachable protective sleeve is provided on the outside of the gas control unit, the protective sleeve being used to clamp the gas control unit, the cable, and the wear-resistant sheath near the gas control unit.

[0013] A further preferred embodiment of this utility model is: the protective sleeve is an elastic metal and is a circular sleeve with an opening on one side, and the side with the opening has a mating cavity that mates with the longitudinal axis of the gas control unit.

[0014] A further preferred embodiment of this utility model is: the machine body has a controller, and the pressure gauge is electrically connected to the controller.

[0015] Compared with the prior art, the advantages of this utility model are: 1. The filter effectively removes dust and impurities from the compressed air, reducing nozzle burnout caused by arc burning and abnormal electrode wear, extending nozzle life, and reducing operating costs.

[0016] 2. Real-time monitoring with a pressure gauge ensures stable gas pressure within a suitable range, improving cutting quality. By monitoring the pressure difference across the filter, the filter clogging status can be determined intuitively and in advance, allowing operators to replace it before the pressure difference becomes too large, enabling early warning and maintenance. Furthermore, changes in the pressure gauge reading trigger changes in the controller's current. If the gas pressure is insufficient, the cutting current is automatically reduced or the machine is shut down to prevent arc divergence and nozzle burnout due to insufficient gas flow caused by low pressure. Attached Figure Description

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be regarded as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the cutting torch cable part of this utility model; Figure 3 This is a schematic diagram of a partial separation structure of the cutting torch cable portion of this utility model; Figure 4 This is a schematic diagram of the gas control unit of this utility model; Figure 5 This is a half-sectional structural diagram of the gas control unit of this utility model; Figure 6 This is a schematic diagram of the internal structure of the longitudinal axis and the outer cover of this utility model.

[0019] In the diagram: 1. Body; 2. Torch section; 3. Torch cable; 31. Wear-resistant sheath; 32. Protective sleeve; 321. Mating cavity; 33. Gas pipe; 4. Gas control section; 41. Horizontal axis; 411. External threaded sleeve; 412. Sealing ring one; 413. Internal threaded sleeve; 414. Internal mating sleeve; 415. Connecting cavity; 42. Vertical axis; 421. Filter plate; 422. Outer cover; 423. Limiting edge one; 424. Limiting edge two; 425. Sealing ring two; 43. Pressure gauge; 431. Connecting shaft. Detailed Implementation

[0020] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0021] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it may not be further defined and explained in subsequent figures.

[0022] This embodiment mainly describes a single-plate arc plasma cutting machine designed to prevent nozzle burn-out. Please refer to [link / reference needed]. Figures 1-6 Specifically, the single-gas-path plasma cutting machine has a simple structure and low cost, but the nozzle is easily burned out. One of the reasons for nozzle burnout is the cleanliness of the air and the pressure of the gas. When there is dust in the air, it is easy to accelerate electrode wear and block the nozzle hole, causing the arc to burn out and the nozzle to burn out. When the pressure is too low, the gas flow is insufficient, which can easily lead to arc divergence and nozzle burnout. Based on this, a single-plate arc plasma cutting machine to prevent nozzle burnout is proposed, including a body 1, a torch cable 3 connected to the body 1, and a torch section 2 connected to the torch cable 3. The torch cable 3 includes a wear-resistant sheath 31. The wear-resistant sheath 31 is provided with a cable for electrically connecting the torch section 2 to the body 1. The wear-resistant sheath 31 is also provided with a gas pipe 33 for transmitting the gas used by the torch section 2. A gas control unit 4 is installed in the middle section of the gas pipe 33. The gas control unit 4 includes a horizontal shaft 41 and a vertical shaft 42 for connecting the gas tube 33. The horizontal shaft 41 is perpendicular to the vertical shaft 42 and is integral with it. The interior of the vertical shaft 42 is provided with a filter 421 for filtering the gas, and the exterior of the vertical shaft 42 is provided with a pressure gauge 43 for detecting the gas pressure.

[0023] Specifically, the body 1, the torch cable 3 connected to the body 1, and the torch section 2 connected to the torch cable 3 are all existing technologies. The wear-resistant sheath 31 is used to cover the cable, the air pipe 33, and other lines to prevent the lines from becoming tangled. The gas control unit 4 is used to filter the gas in the air pipe 33 to make the gas moving to the torch section 2 relatively clean, minimizing arc burnout and nozzle damage. The pressure gauge 43 is used to detect the gas pressure in the air pipe 33 to minimize excessive fluctuations in gas pressure that could lead to arc divergence and nozzle burnout.

[0024] like Figure 4 As shown, both ends of the horizontal shaft 41 are rotatably connected to external threaded sleeves 411, and the ends of the air pipes 33 on both sides near the horizontal shaft 41 are fixed with internal threaded sleeves 413, which are threadedly connected to the external threaded sleeves 411. The horizontal axis 41 is closed in the middle, and both ends of the closed axis are provided with connecting cavities 415 that communicate with the interior of the vertical axis 42. The openings of the two connecting cavities 415 are located on both sides of the filter 421, allowing gas to pass through the filter 421.

[0025] Specifically, the horizontal axis 41 connects the two sections of the gas pipe 33. One section is closer to the torch section 2 and is therefore more affected by high temperatures, making it more prone to aging. The other section is farther away from the torch section 2 and therefore ages more slowly. Based on this, the aged gas pipe 33 can be directly disassembled by rotating the external threaded sleeve 411. Therefore, only one section of the gas pipe 33 needs to be replaced, minimizing material waste. Secondly, the filter 421 filters the gas, making the gas moving to the torch section 2 relatively clean and less prone to arc burnout, which could damage the nozzle.

[0026] like Figure 4 As shown, the inner threaded sleeve 413 is also provided with an inner mating sleeve 414. The inner mating sleeve 414 is fixed to the end of the air tube 33. Both ends of the horizontal shaft 41 have a sealing ring 412. The inner mating sleeve 414 extends into the outer threaded sleeve 411 and abuts against the sealing ring 412.

[0027] Specifically, by rotating the external threaded sleeve 411, it can be threadedly engaged with the internal threaded sleeve 413, and the internal mating sleeve 414 can abut against the sealing ring 412 to achieve a sealing effect, which will not easily lead to gas leakage at the connection position.

[0028] like Figures 5-6 As shown, the interior of the longitudinal shaft 42 is connected to the outside. The lower end of the longitudinal shaft 42 is detachably fixed with an outer cover 422. The outer cover 422 has a sealing ring 425 that is pressed against the lower end of the longitudinal shaft 42. The filter sheet 421 is installed inside the longitudinal shaft 42 from bottom to top.

[0029] Specifically, the filter element 421 can be removed and installed downwards, making replacement relatively convenient. It should be noted that the outer cover 422 is used to support the filter element 421 and also to seal the opening at the lower end of the longitudinal shaft 42 to prevent gas leakage. When the outer cover 422 is closed, it is pressed against the sealing ring 425 at the lower end of the longitudinal shaft 42 to ensure a sealed state.

[0030] Filter 421 is a filter element material that can filter out fine dust in the air.

[0031] like Figure 6 As shown, the inner wall of the longitudinal shaft 42 has a limiting edge 423 for clamping the filter sheet 421, and the inner wall of the outer cover 422 has a limiting edge 424 for clamping the filter sheet 421. The filter sheet 421 is pressed against the longitudinal shaft 42 and the inner wall of the outer cover 422.

[0032] Specifically, the limiting edge 423 and the limiting edge 424 are used to limit the filter 421, so as to prevent the filter 421 from shifting its position during use and to prevent gas from seeping from its edge, so that the gas passes through the filter 421.

[0033] like Figures 4-6As shown, there are two pressure gauges 43, both located at the lower end of the outer cover 422. A connecting shaft 431 fixed to the outer cover 422 is fixed to the outside of the pressure gauge 43. The detection ends of the two connecting shafts 431 extend into the inner part of the outer cover 422 and are located on both sides of the filter 421 respectively, for detecting the air pressure on both sides of the filter 421.

[0034] Specifically, the two pressure gauges 43 are used to detect the gas pressure on both sides of the filter 421. Under normal use, the readings of the two pressure gauges 43 are not much different. After long-term use, the filter 421 becomes severely blocked, causing the gas pressure readings on both sides to change. This prompts the operator to replace the filter 421 in time. It should be noted that the connecting shaft 431 is used to fix the pressure gauges 43, and the part of the connecting shaft 431 that extends into the outer cover 422 is the part used for detection.

[0035] like Figures 2-3 As shown, a removable protective sleeve 32 is provided on the outside of the gas control unit 4. The protective sleeve 32 is used to clamp the gas control unit 4, the cable and the wear-resistant sheath 31 near the gas control unit 4.

[0036] Specifically, the protective sleeve 32 mainly limits the part where the gas control unit 4 is installed, and at the same time limits the cutting torch cable 3 around the gas control unit 4, so that the cable is not easily scattered.

[0037] like Figure 3 As shown, the protective sleeve 32 is a flexible metal and is a circular sleeve with an opening on one side. The side with the opening has a mating cavity 321 that mates with the longitudinal axis 42 of the gas control unit 4.

[0038] Specifically, the protective sleeve 32 has elasticity to clamp the easily scattered cable. Since the position of the torch cable 3 needs to change during the operator's operation, it is easy to scatter when it is not restrained.

[0039] The machine body 1 has a controller, and the pressure gauge 43 is electrically connected to the controller. Specifically, the machine body 1 has an existing controller. The change in the value of the pressure gauge 43 is converted into an electrical signal and transmitted to the controller, causing the controller to change the current. If the air pressure is insufficient, the cutting current is automatically reduced or the machine is stopped to avoid arc divergence and nozzle burnout due to insufficient gas flow when the pressure is too low.

[0040] Working principle: The main body 1 is used to provide electrical energy, converting 220V mains power into stable, high-intensity DC power, and providing control logic. This is existing technology. The use of a high-frequency arc igniter to establish the guiding arc is also existing technology. The cutting torch 2 is also existing technology. It is important to know that the gas supplied to the cutting torch is provided by an air compressor, which delivers compressed air into the machine body 1 and then to the cutting torch section 2 through the air pipe 33.

[0041] As the gas is transmitted along the gas pipe 33, it passes through the gas control unit 4, causing the gas to enter from one end of the horizontal shaft 41, pass through the filter 421, and exit from the other end of the horizontal shaft 41. When the gas passes through the filter 421, dust and impurities are adsorbed onto it, resulting in relatively clean gas reaching the cutting torch 2 and extending the nozzle's service life. It should be noted that after removing the outer cover 422, the filter 421 can be removed and replaced, as it is prone to clogging with dust and impurities during prolonged use.

[0042] Two pressure gauges 43 are used to detect the gas pressure in the gas path. The two gauges 43 respectively detect the gas pressure on both sides of the filter 421. During prolonged use, the filter 421 gradually becomes clogged, resulting in a higher gas pressure on one side and a lower pressure on the other. The pressure gauges 43 on both sides show a significant difference in readings, serving as a warning to the operator that the filter 421 needs to be replaced. It should be noted that the gas pressure exiting the filter 421 is detected by one of the pressure gauges 43. This is used to monitor the gas pressure used for cutting, preventing excessively low pressure that could hinder the compression and activation of the plasma arc, leading to arc ignition failure, reduced cutting capacity, and damage to the cutting torch.

[0043] It should also be noted that the pressure gauge 43 can also be electrically connected to the controller inside the machine body 1. When detecting the gas pressure used for cutting, that is, the gas pressure after passing through the filter 421, the value of the pressure gauge 43 will change. When the value changes, the controller inside the machine body 1 controls the change of current. If the gas pressure is insufficient, the cutting current will be automatically reduced or the machine will be stopped to avoid arc divergence and nozzle burnout due to insufficient gas flow when the pressure is too low.

[0044] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing this utility model 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 utility model.

[0045] The above provides a detailed description of a single-plate arc plasma cutting machine for preventing nozzle burn-out provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand this utility model and its core ideas. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A single-plate arc plasma cutting machine for preventing nozzle burn-out, comprising a machine body, a cutting torch cable connected to the machine body, and a cutting torch section connected to the cutting torch cable, characterized in that, The cutting torch cable includes a wear-resistant sheath, inside which is a cable for electrically connecting the cutting torch to the machine body. The wear-resistant sheath also contains an air pipe for transmitting gas to the cutting torch, and a gas control unit is installed in the middle section of the air pipe. The gas control unit includes a horizontal axis and a vertical axis for connecting the gas pipe. The horizontal axis is perpendicular to the vertical axis and is integral with it. The interior of the vertical axis is equipped with a filter for filtering the gas, and the exterior of the vertical axis is equipped with a pressure gauge for detecting the gas pressure.

2. The single-plate arc plasma cutting machine for preventing nozzle burnout according to claim 1, characterized in that, Both ends of the horizontal shaft are rotatably connected to external threaded sleeves, and the ends of the air pipes on both sides near the horizontal shaft are fixed with internal threaded sleeves, which are threadedly connected to the external threaded sleeves. The horizontal axis is closed in the middle, and both ends of the closed axis have connecting cavities that communicate with the interior of the vertical axis. The openings of the two connecting cavities are located on both sides of the filter, allowing gas to pass through the filter.

3. The single-plate arc plasma cutting machine for preventing nozzle burn-out according to claim 2, characterized in that, The inner threaded sleeve is also provided with an inner mating sleeve, which is fixed to the end of the air tube. Both ends of the horizontal shaft have a sealing ring. The inner mating sleeve extends into the outer threaded sleeve and abuts against the sealing ring.

4. The single-plate arc plasma cutting machine for preventing nozzle burnout according to claim 2, characterized in that, The interior of the longitudinal shaft is connected to the outside. The lower end of the longitudinal shaft is detachably fixed with an outer cover. The outer cover has a sealing ring that presses against the lower end of the longitudinal shaft. The filter is installed inside the longitudinal shaft from bottom to top.

5. The single-plate arc plasma cutting machine for preventing nozzle burnout according to claim 4, characterized in that, The filter sheet is made of filter element material.

6. The single-plate arc plasma cutting machine for preventing nozzle burnout according to claim 4, characterized in that, The inner wall of the longitudinal shaft has a limiting edge one for clamping the filter sheet, and the inner wall of the outer cover has a limiting edge two for clamping the filter sheet. The filter sheet is pressed against the longitudinal shaft and the inner wall of the outer cover.

7. The single-plate arc plasma cutting machine for preventing nozzle burnout according to claim 4, characterized in that, There are two pressure gauges, both located at the lower end of the outer cover. A connecting shaft that is fixed to the outer cover is fixed to the outside of the pressure gauge. The detection ends of the two connecting shafts extend into the inside of the outer cover and are located on both sides of the filter, respectively, for detecting the air pressure on both sides of the filter.

8. The single-plate arc plasma cutting machine for preventing nozzle burn-out according to claim 1, characterized in that, The gas control unit is fitted with a removable protective sleeve on its outer side. The protective sleeve is used to hold the gas control unit, the cable, and the wear-resistant sheath near the gas control unit.

9. The single-plate arc plasma cutting machine for preventing nozzle burnout according to claim 8, characterized in that, The protective sleeve is made of elastic metal and is a circular sleeve with an opening on one side. The side with the opening has a mating cavity that mates with the longitudinal axis of the gas control unit.

10. The single-plate arc plasma cutting machine for preventing nozzle burn-out according to claim 8, characterized in that, The machine contains a controller, and the pressure gauge is electrically connected to the controller.

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