A plasma cutting machine with a pressure limiting mechanism

Abstract

The present invention discloses a plasma cutting machine with a pressure limiting mechanism, which includes a cutting machine body, a plasma generator, a nozzle, an electrode and a gas supply system. A pressure limiting mechanism is integrated inside the cutting machine body, and the pressure limiting mechanism includes a pressure dynamic adjustment component, an over-limit cut-off component and a pressure buffering component; the pressure dynamic adjustment component includes an air path pipeline, a fixed seat, a transmission screw, an adjustment block and a cam. The transmission screw is driven by a driving motor to drive the adjustment block to move along the sliding groove to change the cross-sectional area of the air path pipeline; through the pressure dynamic adjustment component, the present invention can monitor and adjust the gas pressure in real time to maintain the stability of gas supply. This adjustment mechanism has a faster response than the traditional spring-type pressure reducing valve, and can effectively cope with the fluctuations of the external gas source pressure or the sudden change of gas consumption during the cutting process, thereby reducing the fluctuations of the plasma arc energy, improving the cutting accuracy and ensuring a smooth cut.

Description

Technical Field

[0001] The present invention relates to the technical field of plasma arc cutting, and particularly to a plasma cutting machine with a pressure limiting mechanism. Background Technique

[0002] Plasma cutting technology realizes metal cutting by ionizing gas to form a high-temperature plasma arc. Its core components include a plasma generator, an electrode, a nozzle, and a gas supply system. In the prior art, gas pressure control is a key factor affecting cutting quality and equipment life. Compressed gas, such as air and nitrogen, is provided by an external gas source, and a mechanical pressure regulating valve is used to adjust the gas pressure to ensure the stability of the plasma arc.

[0003] Traditional mechanical pressure regulating valves, such as spring-type pressure reducing valves, rely on preset spring pressure to adjust gas output. When the external gas source pressure fluctuates or the gas consumption changes suddenly during the cutting process, the response speed of the valve core is slow, and it cannot adjust the output pressure in real time, resulting in fluctuations in the energy of the plasma arc and causing uneven cuts. Existing equipment lacks a pressure limiting mechanism. When the gas supply pressure abnormally increases, the excessive gas pressure directly impacts the nozzle and the electrode, causing the nozzle aperture to expand, the electrode ablation to accelerate, and even internal short circuits in the plasma generator. Summary of the Invention

[0004] The purpose of the present invention is to provide a plasma cutting machine with a pressure limiting mechanism to solve the problems mentioned in the above background technique.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A plasma cutting machine with a pressure limiting mechanism, including a cutting machine body, a plasma generator, a nozzle, an electrode, and a gas supply system. A pressure limiting mechanism is integrated inside the cutting machine body, and the pressure limiting mechanism includes a pressure dynamic adjustment component, an overlimit cut-off component, and a pressure buffer component.

[0006] The pressure dynamic adjustment component includes an air pipeline, a fixed seat, a transmission screw, an adjustment block, and a cam. The transmission screw is driven by a driving motor to drive the adjustment block to move along the chute to change the cross-sectional area of the air pipeline. The cam is linked with the adjustment block through the transmission screw and pushes the top block and the connecting rod to compress the cylindrical airbag inside the cylinder.

[0007] The overlimit cut-off component includes an emergency cut-off valve and a pressure sensor. The pressure sensor real-time detects the pressure inside the air pipeline. When the pressure exceeds the threshold, it triggers the emergency cut-off valve to close the air path.

[0008] The pressure buffer component is arranged on the inlet side of the nozzle and includes a side seat, a mounting block, a movable baffle, a block-shaped airbag, a reset member, a damping plate, and a buffer member. The movable baffle is slidably inserted into the side seat. The damping plate is provided with micropores. The block-shaped airbag and the reset member jointly abut against the back side of the movable baffle.

[0009] The block-shaped airbag is communicated with the cylindrical airbag through a connecting pipe, and the movable baffle is driven by the expansion of the block-shaped airbag, and the displacement of the end part pressing the movable baffle blocks the micropores to reduce the air pressure impact on the electrode.

[0010] Preferably, a support base is provided at the bottom of the fixed seat, a chute is provided on the support base, and the transmission screw is rotatably connected to the support base through a bearing.

[0011] Preferably, the transmission screw has a double-screw structure, and the thread directions are opposite. The adjusting block is threadedly connected to the transmission screw, and the end part of the adjusting block forms an area blocking the cross-section of the gas pipeline to change the air pressure.

[0012] Preferably, the cylinder is fixed inside the cutting machine body through a support rod, a round block is provided at the opening of the cylinder, the connecting abutting rod is slidably inserted on the round block, a top block is provided at the end of the connecting abutting rod, the top block abuts against the cam, and the cylindrical airbag is located between the connecting abutting rod and the cylinder.

[0013] Preferably, a support member is provided at one end of the support base, and the driving motor is fixedly installed on the support member.

[0014] Preferably, the fixed seat is fixedly sleeved on the gas pipeline, and a moving cavity is provided in the fixed seat for the moving space of the adjusting block.

[0015] Preferably, a sealing gasket is provided on the inner side of the moving cavity, and the sealing gasket fits against the side surface of the adjusting block to form a sealing structure of the gas pipeline.

[0016] Preferably, the side seat is fixedly installed on one side of the nozzle, a receiving groove is provided on the side seat, an installation block is provided at the opening of the receiving groove, and the block-shaped airbag and the reset member are both located in the receiving groove.

[0017] Preferably, the electrode is located inside the nozzle, the tail of the electrode is bonded to the bottom of the damping plate through an elastic ring, a microporous support ring is fixedly sleeved on the electrode, and a buffer member is provided between the microporous support ring and the damping plate.

[0018] Preferably, the damping plate is fixedly connected to the inner side of the nozzle, the micropore diameter of the damping plate decreases along the air flow direction, the buffer member is sleeved on the electrode, and the microporous support ring is an elastic ring.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. Through the pressure dynamic adjustment component, the present invention can monitor and adjust the gas pressure in real time, maintaining the stability of gas supply. This adjustment mechanism has a faster response compared to traditional spring-type pressure reducing valves, and can effectively cope with fluctuations in the external gas source pressure or sudden changes in gas consumption during the cutting process, thereby reducing fluctuations in the plasma arc energy, improving the cutting accuracy, and ensuring a smooth cut.

[0021] 2. When the gas supply pressure abnormally increases, the over-limit cut-off component of the present invention can quickly cut off the gas path, preventing the excessive gas pressure from directly impacting the nozzle and electrode, avoiding problems such as the expansion of the nozzle aperture and the acceleration of electrode ablation, and extending the service life of the equipment.

[0022] 3. Through the design of the over-limit cut-off component, the present invention can immediately cut off the gas path when the gas pressure exceeds the safety threshold, synchronously cut off the power supply of the plasma generator, prevent abnormal arcs, ensure the safety of operators, and prevent the equipment from being damaged due to faults such as internal short circuits. The pressure buffer component can reduce the gas pressure impact, reduce arc jitter, consume kinetic energy through the microporous damping structure, and suppress high-frequency pressure fluctuations, thereby improving the stability during the cutting process and further enhancing the cutting quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the outer structure of the plasma cutting machine of the present invention.

[0024] Figure 2 It is a schematic diagram of one side structure of the plasma cutting machine of the present invention.

[0025] Figure 3 It is a schematic diagram of the structure of the plasma cutting machine with a pressure limiting mechanism of the present invention.

[0026] Figure 4 It is a schematic diagram of the structure of the pressure limiting mechanism of the present invention.

[0027] Figure 5 It is a schematic diagram of the structure of the pressure dynamic adjustment component of the present invention.

[0028] Figure 6 For the present invention Figure 5 The enlarged schematic diagram at position A.

[0029] Figure 7 It is a schematic diagram of the structure between the gas pipeline and the adjustment block of the present invention.

[0030] Figure 8 It is a schematic diagram of the linkage structure of the pressure dynamic adjustment component of the present invention.

[0031] Figure 9 For the present invention Figure 8 The enlarged schematic diagram at position B.

[0032] Figure 10 This is a cross-sectional view of the side seat of the present invention.

[0033] Figure 11 For the present invention Figure 10 The enlarged schematic structural view at position C in the present invention.

[0034] Figure 12 This is a schematic structural view of the pressure buffer assembly of the present invention.

[0035] In the figure: cutting machine body 1; plasma generator 2; nozzle 3; side seat 31; mounting block 32; movable baffle 33; block-shaped airbag 34; reset member 35; damping plate 36; micropores 37; micropore support ring 38; buffer member 39; electrode 4; gas supply system 5; gas pipeline 6; fixed seat 7; emergency cut-off valve 71; pressure sensor 72; support seat 73; chute 74; transmission screw 75; adjusting block 76; gasket 77; cam 78; support member 79; drive motor 80; cylinder 8; round block 81; connecting abutting rod 82; cylindrical airbag 83; connecting pipe 84; top block 85. Specific embodiments

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] Please refer to Figure 1 This is a schematic external structure view of the plasma cutting machine of the present invention, Figure 2 This is a schematic side structure view of the plasma cutting machine of the present invention. The present invention provides a technical solution: a plasma cutting machine with a pressure limiting mechanism, including a cutting machine body 1, a plasma generator 2, a nozzle 3, an electrode 4, and a gas supply system 5.

[0038] The plasma generator 2 is connected to a power source, and its internal includes a high-frequency generator for arc ignition and maintaining the plasma. The output end of the plasma generator 2 is connected to the electrode 4 through an electrical conductor to transmit high-frequency electrical energy. The electrode 4 is located inside the nozzle 3 and is coaxially designed with the nozzle 3. The electrode 4 is fixed inside the nozzle 3 through an insulating material and is electrically connected to the output end of the plasma generator 2.

[0039] The gas supply system 5 includes a gas cylinder, a pressure reducing valve, and a flow meter. One end of the gas supply system 5 is connected to the nozzle 3 through a gas pipeline 6 to provide cooling and auxiliary gas for the plasma arc. The pressure dynamic regulation component and the over-limit cut-off component are integrated in the sealed housing of the cutting machine body 1. The cutting machine body 1 is provided with a mounting groove, and a sealing plate is installed at the opening of the mounting groove.

[0040] Figure 3 This is a schematic structural diagram of the plasma cutting machine with a pressure limiting mechanism according to the present invention. Figure 4 This is a schematic structural diagram of the pressure limiting mechanism according to the present invention. The pressure limiting mechanism is integrated inside the cutting machine body 1, and the pressure limiting mechanism includes a pressure dynamic adjustment component, an overlimit cutting component, and a pressure buffer component.

[0041] Figure 5 This is a schematic structural diagram of the pressure dynamic adjustment component according to the present invention. Figure 6 This is the present invention Figure 5 The enlarged structural diagram at position A in the present invention. The pressure dynamic adjustment component includes an air path pipeline 6, a fixed seat 7, a transmission screw rod 75, an adjustment block 76, and a cam 78. The transmission screw rod 75 is driven by a driving motor 80 to drive the adjustment block 76 to move along the sliding groove 74 to change the cross-sectional area of the air path pipeline 6. The cam 78 is linked with the adjustment block 76 through the transmission screw rod 75 and pushes the top block 85 and the connecting push rod 82 to compress the cylindrical airbag 83 in the cylinder 8.

[0042] The fixed seat 7 is fixedly sleeved on the air path pipeline 6. The fixed seat 7 is provided with a moving cavity for the moving space of the adjustment block 76. A sealing gasket 77 is adhesively bonded to the inner side of the moving cavity. The sealing gasket 77 is attached to the side surface of the adjustment block 76 to form a sealing structure of the air path pipeline 6.

[0043] The sealing gasket 77 has a stepped cross-section, with its thicker end facing the high-pressure side of the air path pipeline 6, and its thinner end is embedded in the inner wall of the moving cavity of the fixed seat 7. When the adjustment block 76 moves, its side surface is always in interference fit with the sealing gasket 77 to ensure the airtightness of the air path pipeline 6 when the cross-sectional area changes.

[0044] Figure 7 This is a schematic structural diagram between the air path pipeline and the adjustment block according to the present invention. A support seat 73 is fixedly installed at the bottom of the fixed seat 7. A sliding groove 74 is provided on the support seat 73. The transmission screw rod 75 is rotatably connected to the support seat 73 through a bearing. The transmission screw rod 75 is a double-screw structure, and the thread directions at both ends are opposite, and are respectively threadedly connected to the two adjustment blocks 76.

[0045] When the driving motor 80 drives the transmission screw rod 75 to rotate clockwise or counterclockwise, the two adjustment blocks 76 move closer to or away from each other along the sliding groove 74, forming a symmetrical adjustment of the cross-sectional area of the air path pipeline 6. The end of the adjustment block 76 forms an occlusion with the cross-sectional area of the air path pipeline 6 to change the air pressure.

[0046] Figure 8 This is a schematic diagram of the linkage structure of the pressure dynamic adjustment component according to the present invention. Figure 9 This is the present invention Figure 8Schematic diagram of the enlarged structure at B in the middle. The cylinder 8 is fixed inside the cutting machine body 1 through a support rod. A round block 81 is provided at the opening of the cylinder 8. The round block 81 is fixed to the cylinder 8 by screws. The connecting abutting rod 82 is slidably inserted on the round block 81. The end of the connecting abutting rod 82 is fixedly connected with a top block 85, and the top block 85 abuts against the cam 78.

[0047] The cylindrical airbag 83 is located between the connecting abutting rod 82 and the cylinder 8. The cylindrical airbag 83 is filled with inert gas. When it is deformed under pressure, the pressure is input through the connecting pipe 84. The spiral reinforcing ribs on the outer wall of the airbag limit the radial expansion, ensuring that the deformation direction is linearly transmitted along the axial direction. One end of the support seat 73 is fixedly connected with a support member 79. The driving motor 80 is fixedly installed on the support member 79, and the output end of the driving motor 80 is fixedly connected with the transmission screw rod 75.

[0048] The contour curve of the cam 78 is designed as an involute, ensuring that the displacement of the top block 85 has a linear relationship with the rotation angle of the screw rod, improving the pressure feedback accuracy. The surface of the top block 85 is provided with a wear-resistant coating to reduce the friction loss of the contact surface with the cam 78.

[0049] The cam 78 is fixedly sleeved on the end of the transmission screw rod 75 and rotates synchronously with the rotation of the screw rod. The eccentric contour of the cam 78 contacts the surface of the top block 85, converting the rotational motion of the screw rod into the linear displacement of the top block 85. One end of the connecting abutting rod 82 is fixed to the top block 85, and the other end extends into the cylinder 8 and abuts against the cylindrical airbag 83. When the cam 78 rotates to push the top block 85, the connecting abutting rod 82 compresses the cylindrical airbag 83.

[0050] Through the double-screw reverse-thread design, the two adjusting blocks 76 move symmetrically, accurately controlling the increase and decrease of the cross-sectional area of the gas pipeline 6, avoiding the airflow unbalance caused by unilateral adjustment. The end of the adjusting block 76 is a wedge-shaped structure, and its moving range covers the entire cross-section of the gas pipeline 6.

[0051] The over-limit cutting component includes an emergency cut-off valve 71 and a pressure sensor 72. The pressure sensor 72 real-time detects the pressure in the gas pipeline 6. When the pressure exceeds the threshold, it triggers the emergency cut-off valve 71 to close the gas path;

[0052] The emergency cut-off valve 71 includes a double-bevel valve core and a magnetic reset mechanism. The closing action of the double-bevel valve core is magnetically driven, and the reset mechanism releases the lock by generating a reverse magnetic force through the electromagnetic coil.

[0053] Figure 10 Cross-sectional view of the side seat of the present invention, Figure 11 For the present invention Figure 10Schematic diagram of the enlarged structure at position C in the figure. The pressure buffer assembly is provided on the inlet side of the nozzle 3 and includes a side seat 31, a mounting block 32, a movable baffle 33, a block-shaped airbag 34, a reset member 35, a damping plate 36, and a buffer member 39. The movable baffle 33 is slidably inserted into the side seat 31. The damping plate 36 is provided with micropores 37. The block-shaped airbag 34 and the reset member 35 jointly abut against the back side of the movable baffle 33.

[0054] The reset member 35 is a double-headed compression spring. One end of it is fixed to the inner wall of the side seat 31, and the other end abuts against the back side of the movable baffle 33. When the block-shaped airbag 34 is in the initial state, the pre-tightening force of the reset member 35 keeps the movable baffle 33 in the initial position, and the micropores 37 are in the fully open state.

[0055] The movable baffle 33 is an L-shaped plate body. Its vertical section is slidably inserted into the receiving groove of the side seat 31 through a dovetail groove structure, and the horizontal section extends to the inlet side of the nozzle 3. The block-shaped airbag 34 is internally provided with an air chamber and is communicated with the cylindrical airbag 83 through a connecting pipe 84. When the cylindrical airbag 83 is pressurized, the gas is injected into the block-shaped airbag 34 through the connecting pipe 84, driving it to expand and push the movable baffle 33. The displacement of the end portion pressing the movable baffle 33 blocks the micropores 37 to reduce the air pressure impact on the electrode 4.

[0056] When the block-shaped airbag 34 inflates and expands, it pushes the movable baffle 33 to slide towards the damping plate 36. By blocking the flow area of the micropores 37, the gas flow rate is restricted, and the air pressure impact is reduced. After the air pressure decreases, the reset member 35 pulls the movable baffle 33 to reset, restoring the fully open state of the micropores 37.

[0057] Figure 12 Schematic diagram of the structure of the pressure buffer assembly of the present invention. The side seat 31 is fixedly installed on one side of the nozzle 3. The side seat 31 is provided with a receiving groove. The opening of the receiving groove is provided with a mounting block 32 through a screw. The block-shaped airbag 34 and the reset member 35 are both located in the receiving groove, and the electrode 4 is located in the nozzle 3.

[0058] The tail of the electrode 4 is bonded to the bottom of the damping plate 36 through an elastic ring. An elastic micropore ring 38 is fixedly sleeved on the electrode 4. A buffer member 39 is fixedly connected between the elastic micropore ring 38 and the damping plate 36. The buffer member 39 is sleeved on the electrode 4, and the elastic micropore ring 38 is an elastic ring.

[0059] The buffer member 39 can be a support spring. The damping plate 36 is fixedly connected to the inner side of the nozzle 3. The axial vibration energy of the electrode 4 is absorbed through the buffer member 39 to reduce the arc jitter.

[0060] The aperture of the micropores 37 of the damping plate 36 decreases along the gas flow direction, and the axis of the pores forms a 15° inclination angle with the gas flow direction, forming a tapered damping structure. The tapered micropores 37 design divides the gas flow into multiple thin streams, and the kinetic energy is consumed through the friction of the pore walls to suppress high-frequency pressure fluctuations.

[0061] In actual use, the gas supply system 5 delivers cooling gas to the nozzle 3 through the gas pipeline 6. In the initial state, the adjusting block 76 is located at the fully open position of the gas pipeline 6, with the maximum gas flow rate. The pressure sensor 72 monitors the air pressure inside the gas pipeline 6 in real time.

[0062] When air pressure fluctuations are detected, the drive motor 80 receives a signal and starts to drive the transmission screw 75 of the double-screw structure to rotate. Since the thread directions at both ends are opposite, the two adjusting blocks 76 move symmetrically along the chute 74, and the wedge-shaped ends gradually block the cross-section of the gas pipeline 6. When the adjusting block 76 moves, its side surface maintains an interference fit with the stepped gasket 77 to ensure airtightness. The reduced cross-sectional area can increase the air flow resistance and reduce the downstream pressure; conversely, the flow rate increases.

[0063] The cam 78 at the end of the transmission screw 75 rotates synchronously, and the involute profile pushes the top block 85 to linearly displace, compressing the cylindrical airbag 83 through the connecting rod 82. The spiral reinforcing ribs limit the radial expansion of the airbag, making its axial compression amount accurately correspond to the rotation angle of the screw.

[0064] After the cylindrical airbag 83 is compressed, the inert gas inside is injected into the block-shaped airbag 34 through the connecting pipe 84, causing it to expand. The block-shaped airbag 34 pushes the L-shaped movable baffle 33 to slide towards the damping plate 36. The vertical section moves along the dovetail groove of the side seat 31, and the horizontal section gradually blocks the tapered micro-holes 37 of the damping plate 36. The flow area of the micro-holes 37 decreases, dividing the air flow into multiple thin streams with an inclination angle of 15°. The kinetic energy is consumed through friction with the hole wall. When the air pressure decreases, the block-shaped airbag 34 contracts, and the reset member 35 pulls the movable baffle 33 back to its original position, and the micro-holes 37 return to the fully open state.

[0065] When the pressure sensor 72 detects that the pressure exceeds the safety threshold, it sends a signal to the emergency cut-off valve 71. The electromagnetic coil generates a reverse magnetic force, driving the double-bevel valve core to quickly close. The original magnetic reset mechanism loses magnetism, and the valve core blocks the gas pipeline 6, simultaneously cutting off the power supply of the plasma generator 2 to prevent abnormal arcs.

[0066] The gas enters the nozzle 3 after being buffered by the damping plate 36. The tail of the electrode 4 is fixed through an elastic ring, and the buffer member 39 absorbs axial vibrations. When the arc jitter causes air pressure fluctuations, the buffer member 39 expands and contracts to offset the vibration energy.

[0067] After troubleshooting, the drive motor 80 rotates in reverse to reset the adjusting block 76 to the initial position. The electromagnetic coil is powered off, and the emergency cut-off valve 71 opens under the action of the return spring. The cylindrical airbag 83 returns to its original state with the cam 78, and the gas in the block-shaped airbag 34 flows back through the connecting pipe 84.

[0068] In summary, through the pressure dynamic adjustment component, the present invention can monitor and adjust the gas pressure in real time to maintain the stability of gas supply. This adjustment mechanism has a faster response than the traditional spring-type pressure reducing valve and can effectively cope with the fluctuations in the external gas source pressure or the sudden changes in gas consumption during the cutting process, thereby reducing the fluctuations in the plasma arc energy, improving the cutting accuracy, and ensuring a smooth cut; when the gas supply pressure abnormally increases, the over-limit cut-off component can quickly cut off the gas path to prevent the excessive gas pressure from directly impacting the nozzle and the electrode, avoiding the problems of nozzle aperture expansion and accelerated electrode ablation, and extending the service life of the equipment; the pressure buffer component can reduce the gas pressure impact, reduce the arc jitter, consume the kinetic energy through the microporous damping structure, and suppress the high-frequency pressure fluctuations, thereby improving the stability during the cutting process and further enhancing the cutting quality.

[0069] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A plasma cutting machine with a pressure limiting mechanism, comprising a cutting machine body, a plasma generator, a nozzle, an electrode and a gas supply system, characterized in that: The cutting machine body is internally integrated with a pressure limiting mechanism, which includes a pressure dynamic adjustment component, an over-limit cutting component, and a pressure buffer component; The pressure dynamic adjustment component includes an air pipeline, a fixing seat, a transmission screw, an adjustment block and a cam. The transmission screw is driven by a driving motor to drive the adjustment block to move along the slide slot to change the cross-sectional area of ​​the air pipeline. The cam is linked with the adjustment block through the transmission screw and pushes the top block and the connecting rod to compress the cylindrical airbag in the cylinder. The over-limit cut-off component includes an emergency cut-off valve and a pressure sensor. The pressure sensor detects the pressure in the gas pipeline in real time. When the pressure exceeds the threshold, the emergency cut-off valve is triggered to close the gas line. The pressure buffer assembly is arranged at the inlet side of the nozzle, and includes a side seat, a mounting block, a movable baffle, a block-shaped airbag, a reset member, a damping plate and a buffer member. The movable baffle is slidably plugged into the side seat, micro holes are arranged on the damping plate, and the block-shaped airbag and the reset member are jointly in contact with the back side of the movable baffle; The block airbag is connected to the cylindrical airbag through a connecting tube, and the movable baffle is driven by the expansion of the block airbag to press the end displacement of the movable baffle and the micropore shielding to reduce the impact of air pressure on the electrode; The electrode is located in the nozzle, the tail of the electrode is bonded to the bottom of the damping plate through an elastic ring, a microporous support ring is fixedly sleeved on the electrode, and a buffer is arranged between the microporous support ring and the damping plate.

2. A plasma cutting machine with a pressure limiting mechanism according to claim 1, characterized in that: A support seat is arranged at the bottom of the fixing seat, a slide groove is arranged on the support seat, and a transmission screw is rotatably connected to the support seat through a bearing.

3. A plasma cutting machine with a pressure limiting mechanism according to claim 2, characterized in that: The transmission screw is a double-screw structure with opposite screw threads. The adjustment block is threadedly connected to the transmission screw. The end of the adjustment block forms a cross-sectional area shielding with the air pipeline to change the air pressure.

4. The plasma cutting machine with a pressure limiting mechanism according to claim 1, characterized in that: The cylinder is fixed inside the cutting machine body by a support rod, a round block is arranged at the opening of the cylinder, a connecting rod is slidably inserted on the round block, a top block is arranged at the end of the connecting rod, the top block is abutted against the cam, and a cylindrical airbag is located between the connecting rod and the cylinder.

5. The plasma cutting machine with a pressure limiting mechanism according to claim 2, characterized in that: A support member is provided at one end of the support seat, and the driving motor is fixedly mounted on the support member.

6. The plasma cutting machine with a pressure limiting mechanism according to claim 1, characterized in that: The fixing seat is fixedly sleeved on the gas pipeline, and a moving cavity is provided on the fixing seat for adjusting the moving space of the block.

7. A plasma cutting machine with a pressure limiting mechanism according to claim 6, characterized in that: A sealing gasket is arranged inside the movable cavity, and the sealing gasket is fitted with the side surface of the regulating block to form a sealing structure of the air pipeline.

8. The plasma cutting machine with a pressure limiting mechanism according to claim 1, characterized in that: The side seat is fixedly mounted on one side of the nozzle, a receiving groove is provided on the side seat, a mounting block is arranged at the opening of the receiving groove, and the block-shaped airbag and the reset member are both located in the receiving groove.

9. The plasma cutting machine with a pressure limiting mechanism according to claim 1, characterized in that: The damping plate is fixedly connected to the inner side of the nozzle, the micropore diameter of the damping plate decreases along the airflow direction, the buffer is sleeved on the electrode, and the micropore support ring is an elastic ring.

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