A plasma cutting machine for steel structures

Abstract

The present invention discloses a plasma cutting machine for steel structures, belonging to the field of plasma cutting, comprising a base, wherein a cavity for accommodating liquid is provided inside the base, and a support grid frame is fixedly connected to the inner wall of the cavity, and a plurality of support flanges are integrally formed on the upper end of the support grid frame; an X-axial displacement portion is connected to the base, and a Y-axial displacement portion is connected to the movable end of the X-axial displacement portion, and a Z-axial displacement portion is connected to the movable end of the Y-axial displacement portion, and a mounting seat is connected to the movable end of the Z-axial displacement portion, and a plasma gun head is fixedly connected to one side of the mounting seat; cutting of steel structure workpieces is achieved in water, and underwater plasma cutting has a certain cooling effect on the workpiece, cutting torch and arc area. This rapid cooling limits the lateral expansion of the plasma arc at the upper part of the kerf, the melting range of the upper part is "compressed", and the width change of the lower part is relatively small, thereby reducing the taper.

Description

Technical Field

[0001] The present invention relates to the field of plasma cutting, and more particularly to a plasma cutting machine for steel structures. Background Art

[0002] Plasma cutting is a process that uses a high-temperature, high-speed plasma arc to melt and cut metal materials. Essentially a thermal cutting method, it is widely used for cutting steel structures due to its high cutting speed and the absence of preheating requirements.

[0003] Currently, when plasma cutting is performed on steel structures, the center of the arc is most ionized, has the highest temperature, and has the strongest melting ability. The closer to the periphery of the arc, the lower the temperature and speed, and the melting ability decreases significantly. When the arc contacts the surface of the steel plate, the high-energy center area can quickly melt through the metal and transfer downward. As the cutting depth increases, the energy at the edge of the arc is insufficient to completely melt the underlying metal, resulting in a narrowing of the lower melt width. This causes a taper in the cut (i.e., the cut is wide at the top and narrow at the bottom, forming a V-shape) when cutting steel workpieces. This is particularly evident when cutting medium-thick steel structures. The taper causes the cutting surface to be non-vertical, and adjacent components cannot fit tightly during splicing, requiring additional adjustment or forced assembly (the taper surface needs to be ground or milled to vertical, increasing labor and equipment costs). Summary of the Invention

[0004] In view of the problems existing in the prior art, an object of the present invention is to provide a plasma cutting machine for steel structures.

[0005] To solve the above problems, the present invention adopts the following technical solutions.

[0006] A plasma cutting machine for steel structure, comprising a base,

[0007] A cavity for accommodating liquid is provided inside the base, and a support grid frame is fixedly connected to the inner wall of the cavity, and a plurality of support flanges are integrally formed on the upper end of the support grid frame;

[0008] The base is connected to an X-axial displacement portion, and the movable end of the X-axial displacement portion is connected to the Y-axial displacement portion, the movable end of the Y-axial displacement portion is connected to the Z-axial displacement portion, and the movable end of the Z-axial displacement portion is connected to a mounting seat, and a plasma gun head is fixedly connected to one side of the mounting seat;

[0009] The plasma gun head is fixedly connected to an external vortex drainage portion, and the vortex drainage portion is used to discharge high-pressure water flow into the liquid in the cavity and disturb the liquid in the cutting area;

[0010] The vortex drainage part includes a hollow ring body fixed to the outside of the plasma gun head, a cavity opened inside the hollow ring body and a tapered cavity connected to the cavity, and multiple tangential water inlets tangentially opened on the outer surface of the hollow ring body and connected to the cavity.

[0011] Furthermore, the upper portion of the hollow ring body is a straight section and the lower portion is a tapered section, the cavity is opened in the straight section and the tapered cavity is opened in the tapered section.

[0012] Furthermore, a guide spiral groove is provided on the inner wall of the cavity for guiding the high-pressure water flow entering the cavity tangentially.

[0013] Furthermore, the multiple tangential water inlets are equidistantly distributed in a circular array outside the hollow ring body, and a pump body for supplying high-pressure water flow to the multiple tangential water inlets is fixedly connected to one side of the Y-axial displacement portion.

[0014] Furthermore, the lower end of the support grid frame is also connected to a slag removal aid component, and the slag removal aid component includes a plurality of brackets fixed to the lower end of the support grid frame, a plurality of electromagnetic disks respectively fixed to the lower ends of the plurality of brackets, a plurality of magnetic pole heads respectively fixed to the upper ends of the plurality of brackets, and a plurality of ultrasonic transducers respectively fixed to the lower ends of the plurality of brackets. An ultrasonic generating part 2 is fixed to both sides of the base, and the ultrasonic generating part 2 is connected to the plurality of ultrasonic transducers. The plurality of magnetic pole heads all pass through the grid grooves of the support grid frame and extend upward.

[0015] Furthermore, a flushing and slag removal part is also connected to one side of the Y-axial displacement part, and the flushing and slag removal part includes a horizontal plate fixedly connected to one side of the Y-axial displacement part, a screw threaded inside the horizontal plate, two guide rods movably inserted inside the horizontal plate, a lifting seat fixedly connected to the lower ends of the two guide rods, and a nozzle fixedly connected to the lower end of the lifting seat. The lower end of the screw is rotatably connected to the upper end of the lifting seat. A pump body 2 is also fixedly connected to one side of the Y-axial displacement part, and the pump body 2 is used to supply high-pressure water flow to the nozzle.

[0016] Furthermore, the mounting seat includes a fixed part fixedly connected to one side of the movable end of the Z-axial displacement part and a movable part connected to one side of the fixed part, the fixed part is internally connected to a forward and backward tilt control part, and the forward and backward tilt control part includes a movable groove opened inside the fixed part, a gear rotatably connected to the movable groove, a rack sliding in the movable groove and meshing with the gear, a screw screwed inside the rack and both ends of which are rotatably connected to the inner wall of the movable groove, one side of the movable part is fixedly connected to one side of the gear, the other side of the movable part is fixedly connected to an ion gun head, and one side of the fixed part is fixedly connected to a motor for driving the screw to rotate.

[0017] Furthermore, a tilt sensor is fixedly connected to the other side of the movable part.

[0018] Furthermore, a piezoelectric ceramic ring is fixed to the outside of the hollow ring body, and a plurality of amplitude rods are fixed to the inside of the piezoelectric ceramic ring. An ultrasonic generating part 1 is also fixed to one side of the Y-axis displacement part, and the ultrasonic generating part 1 is connected to the plurality of amplitude rods.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) This solution is provided with a base, and a cavity for accommodating water is opened inside the base. By placing the steel structure workpiece in the water and supported by the supporting flange, the steel structure workpiece is cut in the water. Underwater plasma cutting has a certain cooling effect on the workpiece, cutting torch and arc area. This rapid cooling limits the lateral expansion of the plasma arc in the upper part of the cut. The cooling speed of the lower part of the cut is also very fast, but due to the downward penetration characteristics of the plasma arc itself and the process of the molten metal being blown downward by the high-speed airflow is relatively unobstructed by water (especially after penetration), the width of the lower part of the cut is less affected by cooling, the melting range of the upper part is "compressed", and the width change of the lower part is relatively small, thereby reducing the upper and lower width difference of the cut, that is, reducing the taper.

[0021] (2) This solution is provided with a vortex drainage part, which pressurizes water through a pump body and then pumps it into multiple tangential water inlets. The high-pressure water flows into the cavity from the tangential water inlet and forms a vortex along the guide spiral groove. The high-pressure water flows out from the bottom of the tapered cavity and enters the water body. The discharged high-pressure water flow can disturb the water flow near the cutting area, thereby prompting the slag generated by underwater plasma cutting to move out from the vicinity of the cutting seam. The slag is removed in time by the disturbing water flow discharged into the water body, preventing the slag from secondary solidification in the cutting seam to form a tumor-like protrusion, thereby improving the cutting quality and ensuring the taper of the cutting seam.

[0022] (3) This scheme is equipped with a slag removal assisting component. During the cutting process, the electromagnetic disk is energized and generates magnetic force, so that the magnetic pole head close to the bottom of the steel structure workpiece generates magnetic force. The magnetic field can exert a directional traction force on the cooling slag (the temperature drops to the magnetic activation range) to accelerate its separation from the incision. The magnetic field gradient can guide the slag to the bottom or side of the incision, reduce its adhesion to the edge of the incision, reduce the accumulation of slag at the lower edge of the incision, reduce the difficulty of slag cleaning, improve the roughness of the cut surface, inhibit large particles of slag from falling back to the arc path, avoid arc breaking or cutting deviation, reduce the splashing pollution of the cutting nozzle by slag, reduce the nozzle loss rate, collect iron-containing slag in a centralized manner, facilitate recycling, and reduce the pollution of suspended particles in the water. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic structural diagram of the vortex drainage portion of the present invention;

[0025] Figure 3 For the present invention Figure 1 A schematic diagram of the structure at center A;

[0026] Figure 4 This is a schematic structural diagram of the pump body 1, ultrasonic generating part 1 and flushing and slag removing part of the present invention;

[0027] Figure 5 This is a schematic structural diagram of the hollow annular body and tangential water inlet portion of the present invention;

[0028] Figure 6 It is a cross-sectional view of the hollow ring body of the present invention;

[0029] Figure 7 This is a schematic structural diagram of the forward and backward tilt control unit of the present invention;

[0030] Figure 8 This is a schematic diagram of the magnetic pole head structure of the present invention;

[0031] Figure 9 It is a schematic structural diagram of the bracket, electromagnetic disk and ultrasonic transducer part of the present invention.

[0032] Description of the numbers in the figure:

[0033] 1. Base; 11. Cavity; 12. Support grid; 13. Support flange; 2. X-axis displacement portion; 3. Y-axis displacement portion; 4. Z-axis displacement portion; 41. Mounting seat; 411. Fixed portion; 412. Movable portion; 5. Plasma gun head; 6. Eddy current drainage portion; 61. Pump body 1; 62. Hollow ring; 63. Tangential water inlet portion; 64. Cavity; 65. Gradual reduction cavity; 66. Guide spiral groove; 7. Piezoelectric ceramic ring; 71. Amplitude transformer; 7 2. Ultrasonic generating unit 1; 8. Forward and backward tilt control unit; 81. Movable groove; 82. Screw; 83. Rack; 84. Gear; 85. Motor; 86. Inclination sensor; 9. Flushing and slag removal unit; 91. Pump body 2; 92. Screw; 93. Guide rod; 94. Lifting seat; 95. Nozzle; 10. Slag removal aid component; 101. Bracket; 102. Electromagnetic disk; 103. Magnetic pole head; 104. Ultrasonic transducer unit; 105. Ultrasonic generating unit 2. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only 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 ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0035] See also Figures 1 to 9, a plasma cutting machine for steel structure, comprising a base 1,

[0036] The base 1 has a cavity 11 for containing liquid, and a support grid frame 12 is fixedly connected to the inner wall of the cavity 11. The upper end of the support grid frame 12 is integrally formed with a plurality of support flanges 13;

[0037] The base 1 is connected to an X-axial displacement portion 2, and the movable end of the X-axial displacement portion 2 is connected to a Y-axial displacement portion 3, and the movable end of the Y-axial displacement portion 3 is connected to a Z-axial displacement portion 4, and the movable end of the Z-axial displacement portion 4 is connected to a mounting seat 41, and a plasma gun head 5 is fixedly connected to one side of the mounting seat 41;

[0038] The plasma gun head 5 is fixedly connected to an external vortex drain portion 6 , and the vortex drain portion 6 is used to discharge high-pressure water flow into the liquid in the cavity 11 and disturb the liquid in the cutting area.

[0039] By adopting the above technical solution, the steel structure workpiece to be cut is placed on the support grid frame 12 and supported by multiple support flanges 13, water is added to the cavity 11 so that the water covers the workpiece, the plasma gun head 5 is connected to the plasma power supply, the air compressor and other components, the grounding clamp is clamped on the workpiece, the X-axial displacement part 2 is controlled to drive the plasma gun head 5 to move in the X-axis, the Y-axial displacement part 3 is controlled to drive the plasma gun head 5 to move in the Y-axis, and the Z-axial displacement part 4 is controlled to drive the plasma gun head 5 to move in the Z-axis (adjusting the cutting distance between the plasma gun head 5 and the workpiece), thereby driving the plasma gun head 5 to perform X, Y, and Z-axis motion to cut the workpiece. In this way, the cutting of the steel structure workpiece is achieved in water. Underwater plasma cutting has a certain cooling effect on the workpiece, the cutting torch and the arc area. This rapid cooling limits the lateral expansion of the plasma arc in the upper part of the kerf. The lower part of the cut also cools very quickly. However, due to the downward penetration characteristics of the plasma arc itself and the fact that the molten metal is relatively unimpeded by water when blown downward by the high-speed airflow (especially after penetration), the width of the lower part of the cut is less affected by cooling. The melting range of the upper part is "compressed", while the width change of the lower part is relatively small, thus reducing the difference in the upper and lower widths of the cut, that is, reducing the taper. At the same time, the molten metal blown off by the high-speed plasma airflow will solidify (quench) when it encounters water. This prevents the molten metal from reattaching or flowing to the lower edge of the cut or dross, thereby helping to maintain the clarity of the lower edge of the cut.

[0040] like Figure 4-Figure 6 As shown, the vortex drainage portion 6 includes a hollow ring body 62 fixed to the outside of the plasma gun head 5, a cavity 64 opened inside the hollow ring body 62 and a tapered cavity 65 connected to the cavity 64, and a plurality of tangential water inlet portions 63 tangentially opened on the outer surface of the hollow ring body 62 and connected to the cavity 64.

[0041] The upper portion of the hollow ring body 62 is a straight section and the lower portion is a tapered section. The cavity 64 is provided in the straight section and the tapered cavity 65 is provided in the tapered section.

[0042] The inner wall of the cavity 64 is further provided with a guide spiral groove 66 for guiding the high-pressure water flow tangentially entering the cavity 64 .

[0043] The multiple tangential water inlets 63 are equidistantly distributed in a circular array outside the hollow ring body 62 , and a pump body 61 for supplying high-pressure water flow to the multiple tangential water inlets 63 is fixedly connected to one side of the Y-axial displacement portion 3 .

[0044] By adopting the above technical solution, the pump body 61 is connected to multiple tangential water inlets 63 through pipes (the pipes are not shown in the drawings of this application specification). The pump body 61 pressurizes the water and pumps it into the multiple tangential water inlets 63. The high-pressure water flow enters the cavity 64 tangentially and forms a vortex in the cavity 64 through the guide spiral groove 66. The water flows out of the hollow ring body 62 through the opening at the bottom of the tapered cavity 65 and enters the water inside the cavity 11. The high-pressure water flow discharged from the hollow ring body 62 can disturb the water flow near the cutting area of ​​the workpiece, thereby prompting the slag generated by underwater plasma cutting to be quickly removed from the vicinity of the cutting seam. The slag is removed in time by the disturbing water flow discharged into the water body, preventing the slag generated during cutting from adhering to the cutting seam and solidifying again to form a tumor-like protrusion, thereby improving the cutting quality and ensuring the verticality of the cutting seam.

[0045] like Figure 4 、 Figure 8 and Figure 9 As shown, the lower end of the support grid frame 12 is also connected to a slag removal aid component 10, and the slag removal aid component 10 includes a plurality of brackets 101 fixed to the lower end of the support grid frame 12, a plurality of electromagnetic disks 102 respectively fixed to the lower ends of the plurality of brackets 101, a plurality of magnetic pole heads 103 respectively fixed to the upper ends of the plurality of brackets 101, and a plurality of ultrasonic transducer parts 104 respectively fixed to the lower ends of the plurality of brackets 101. Ultrasonic generating parts 105 are fixed on both sides of the base 1, and the ultrasonic generating parts 105 are connected to the plurality of ultrasonic transducer parts 104. The plurality of magnetic pole heads 103 all pass through the grid grooves of the support grid frame 12 and extend upward.

[0046] One side of the Y-axial displacement part 3 is also connected to a flushing and slag removal part 9, and the flushing and slag removal part 9 includes a horizontal plate fixedly connected to one side of the Y-axial displacement part 3, a screw 92 screwed inside the horizontal plate, two guide rods 93 movably inserted inside the horizontal plate, a lifting seat 94 fixed to the lower ends of the two guide rods 93, and a nozzle 95 fixed to the lower end of the lifting seat 94. The lower end of the screw 92 is rotatably connected to the upper end of the lifting seat 94. One side of the Y-axial displacement part 3 is also fixedly connected to a pump body 2 91, and the pump body 2 91 is used to supply high-pressure water flow to the nozzle 95.

[0047] By adopting the above technical solution, when underwater plasma cutting is performed on a workpiece, the electromagnetic disk 102 is controlled to work and multiple magnetic pole heads 103 (industrial pure iron DT4C can be used, and its surface is nickel-plated with 5-10μm for rust prevention, and a silica aerogel composite material with a density of 200kg / m³ and a thickness of 10-15mm is provided on the outside of the magnetic pole head 103 to insulate the magnetic pole head 103 and prevent the magnetic permeability from attenuating) generate magnetic force. The magnetic field generated by the magnetic pole head 103 can exert a directional traction force on the cooling slag (the temperature drops to the magnetic activation range) to accelerate its separation from the incision. The magnetic field gradient can guide the slag to move to the bottom or side of the incision, reduce its adhesion to the edge of the incision, reduce the accumulation of slag at the lower edge of the incision, reduce the difficulty of slag cleaning, improve the roughness of the cut surface, and suppress large particles. The slag falls back to the arc path, avoiding arc breaking or cutting deviation, reducing the splashing pollution of the slag to the cutting nozzle, reducing the nozzle loss rate, and collecting the iron-containing slag in a centralized manner for easy recycling and reducing the pollution of suspended particles in the water body; when it is necessary to clean the slag attracted by the magnetic pole head 103, the electromagnetic disk 102 is stopped, and the ultrasonic generating part 105 is controlled to work so that the multiple ultrasonic transducer parts 104 work and drive the bracket 101 and the multiple magnetic pole heads 103 to generate low-frequency vibrations, and then the screw 92 is rotated to lower the lifting seat 94, and the input end of the nozzle 95 is connected to the output end of the pump body 91. The water is pressurized by the pump body 91 and pumped into the nozzle 95, and a high-pressure water flow is ejected from the nozzle 95. The water flow can blow to the outer surface of the magnetic pole head 103, and the low-frequency vibration can effectively remove the slag attracted by the outer surface of the magnetic pole head 103.

[0048] like Figure 7As shown, the mounting seat 41 includes a fixed portion 411 fixedly connected to one side of the moving end of the Z-axial displacement portion 4 and a movable portion 412 connected to one side of the fixed portion 411, the fixed portion 411 is internally connected to a forward and backward tilt control portion 8, and the forward and backward tilt control portion 8 includes a movable groove 81 opened inside the fixed portion 411, a gear 84 rotatably connected to the movable groove 81, a rack 83 sliding in the movable groove 81 and meshing with the gear 84, a screw rod 82 screwed inside the rack 83 and both ends of which are rotatably connected to the inner wall of the movable groove 81, one side of the movable portion 412 is fixedly connected to one side of the gear 84, the other side of the movable portion 412 is fixedly connected to the plasma gun head 5, and one side of the fixed portion 411 is fixedly connected to a motor 85 for driving the screw rod 82 to rotate.

[0049] A tilt sensor 86 is also fixed to the other side of the movable portion 412 .

[0050] By adopting the above technical solution, the motor 85 drives the screw rod 82 to rotate, and the rotation of the screw rod 82 can drive the rack 83 to translate in the movable groove 81, and the rack 83 drives the gear 84 to rotate. The rotation of the gear 84 drives the movable part 412 and the plasma gun head 5 to rotate at a small angle, so that the plasma gun head 5 is tilted forward or backward in the cutting direction. When performing underwater plasma cutting, the forward tilt of the plasma gun head 5 is usually used to quickly penetrate thick plates at the beginning of cutting, or to compensate for the amount of back drag under specific materials or speeds during cutting. Under water, the forward tilt can be It can help to start the arc more smoothly and maintain arc stability, especially when cutting thick plates. Under water, the cooling effect of water has improved the verticality. Although the application of the plasma gun head 5 back tilt may not be as critical or effective as in the air, it can still be used as a fine-tuning parameter to optimize the incision quality under specific conditions (such as reducing top burrs). The underwater environment greatly reduces the main factors that lead to large taper (upper heat diffusion and oxidation). Therefore, even with a smaller back tilt angle, better verticality (smaller taper) can be obtained underwater than with back tilt cutting in the air.

[0051] like Figure 4 and Figure 6 As shown, the outside of the hollow ring body 62 is fixedly connected to a piezoelectric ceramic ring 7, and the inside of the piezoelectric ceramic ring 7 is fixedly connected to a plurality of amplitude rods 71. An ultrasonic generating part 72 is also fixedly connected to one side of the Y-axis displacement part, and the ultrasonic generating part 72 is connected to the plurality of amplitude rods 71.

[0052] By adopting the above technical solution, the ultrasonic generating part 72 outputs signals to the multiple amplitude transformers 71, so that the multiple amplitude transformers 71 work to generate low-frequency vibrations. The low-frequency vibrations generate ultrasonic waves and act on the hollow ring body 62 and the plasma gun head 5. Micron-level cavitations are generated in the water through low-frequency ultrasonic waves, and microjets of >1000m / s are formed when they collapse, which directly impact the interface between the slag and the substrate, and at the same time excite standing waves on the surface of the incision molten pool, causing periodic fluctuations in the molten metal, reducing adhesion, reducing slag thickness and residual oxides on the side wall, and improving the taper of the cutting seam.

[0053] Working principle: Place the steel structure workpiece to be cut on the support grid frame 12 and support the workpiece through multiple support flanges 13, add water to the cavity 11 and make the water cover the workpiece, connect the plasma gun head 5 with the plasma power supply, air compressor and other components, clamp the ground clamp on the workpiece, control the Y-axial displacement part 3, X-axial displacement part 2 and Z-axial displacement part 4 to drive the plasma gun head 5 to perform XYZ three-axis movement to cut the workpiece. During the cutting process, the pump body 61 pressurizes the water and pumps it into multiple tangential water inlet parts 63. The high-pressure water flow cuts the workpiece. The water flows into the cavity 64 and forms a vortex in the cavity 64 through the guide spiral groove 66. The water flows out of the hollow ring body 62 through the opening at the bottom of the tapered cavity 65 and enters the water inside the cavity 11. The high-pressure water flow discharged from the hollow ring body 62 can disturb the water flow near the cutting area of ​​the workpiece, so as to prompt the slag generated by the underwater plasma cutting to move quickly away from the vicinity of the cutting seam, control the operation of the electromagnetic disk 102 and enable the multiple magnetic pole heads 103 to apply directional traction to accelerate its departure from the incision. The magnetic field gradient can guide the slag to move to the bottom of the incision or to the side.

[0054] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any person skilled in the art who, within the technical scope disclosed by the present invention, makes equivalent substitutions or modifications based on the technical solutions and improved concepts of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A plasma cutting machine for steel structures, comprising a base (1), characterized in that: A cavity (11) for accommodating liquid is provided inside the base (1), and a support grid frame (12) is fixedly connected to the inner wall of the cavity (11), and a plurality of support flanges (13) are integrally formed on the upper end of the support grid frame (12); The base (1) is connected to an X-axial displacement portion (2), and the movable end of the X-axial displacement portion (2) is connected to a Y-axial displacement portion (3), the movable end of the Y-axial displacement portion (3) is connected to a Z-axial displacement portion (4), and the movable end of the Z-axial displacement portion (4) is connected to a mounting seat (41), and a plasma gun head (5) is fixedly connected to one side of the mounting seat (41); The plasma gun head (5) is fixedly connected to the outside of a vortex drainage portion (6), and the vortex drainage portion (6) is used to discharge high-pressure water flow into the liquid in the cavity (11) and disturb the liquid in the cutting area; The vortex drainage portion (6) comprises a hollow ring body (62) fixed to the outside of the plasma gun head (5), a cavity (64) opened inside the hollow ring body (62), a tapered cavity (65) connected to the cavity (64), and a plurality of tangential water inlet portions (63) tangentially opened on the outer surface of the hollow ring body (62) and connected to the cavity (64).

2. The plasma cutting machine for steel structures according to claim 1, characterized in that: The upper portion of the hollow ring body (62) is a straight section and the lower portion is a tapered section. The cavity (64) is opened in the straight section and the tapered cavity (65) is opened in the tapered section.

3. The plasma cutting machine for steel structure according to claim 2, characterized in that: A guide spiral groove (66) for guiding the high-pressure water flow entering the cavity (64) tangentially is also provided on the inner wall of the cavity (64).

4. The plasma cutting machine for steel structure according to claim 3, characterized in that: The plurality of tangential water inlet portions (63) are distributed in a circular array at equal intervals outside the hollow ring body (62), and a pump body (61) for supplying high-pressure water flow to the plurality of tangential water inlet portions (63) is fixedly connected to one side of the Y-axial displacement portion (3).

5. The plasma cutting machine for steel structure according to claim 4, characterized in that: The lower end of the support grid frame (12) is also connected to a slag removal assisting assembly (10), and the slag removal assisting assembly (10) includes a plurality of brackets (101) fixed to the lower end of the support grid frame (12), a plurality of electromagnetic disks (102) respectively fixed to the lower ends of the plurality of brackets (101), a plurality of magnetic pole heads (103) respectively fixed to the upper ends of the plurality of brackets (101), and a plurality of ultrasonic transducer parts (104) respectively fixed to the lower ends of the plurality of brackets (101). Both sides of the base (1) are fixed with ultrasonic generating parts 2 (105), and the ultrasonic generating parts 2 (105) are connected to the plurality of ultrasonic transducer parts (104). The plurality of magnetic pole heads (103) all pass through the grid slots of the support grid frame (12) and extend upward.

6. The plasma cutting machine for steel structure according to claim 5, characterized in that: The Y-axial displacement portion (3) is also connected to a flushing and slag removal portion (9) on one side, and the flushing and slag removal portion (9) includes a horizontal plate fixedly connected to one side of the Y-axial displacement portion (3), a screw (92) screwed inside the horizontal plate, two guide rods (93) movably inserted inside the horizontal plate, a lifting seat (94) fixed to the lower ends of the two guide rods (93), and a nozzle (95) fixed to the lower end of the lifting seat (94), the lower end of the screw (92) is rotatably connected to the upper end of the lifting seat (94), and the Y-axial displacement portion (3) is also fixed to a second pump body (91), and the second pump body (91) is used to supply high-pressure water flow to the nozzle (95).

7. The plasma cutting machine for steel structure according to claim 6, characterized in that: The mounting seat (41) includes a fixed portion (411) fixedly connected to one side of the movable end of the Z-axial displacement portion (4) and a movable portion (412) connected to one side of the fixed portion (411), the fixed portion (411) is internally connected to a forward and backward tilt control portion (8), and the forward and backward tilt control portion (8) includes a movable groove (81) provided inside the fixed portion (411), a gear (84) rotatably connected to the movable groove (81), a rack (83) slidably connected to the movable groove (81) and meshed with the gear (84), a screw (82) screwed inside the rack (83) and rotatably connected to the inner wall of the movable groove (81) at both ends, one side of the movable portion (412) is fixedly connected to one side of the gear (84), the other side of the movable portion (412) is fixedly connected to a plasma gun head (5), and one side of the fixed portion (411) is fixedly connected to a motor (85) for driving the screw (82) to rotate.

8. The plasma cutting machine for steel structure according to claim 7, characterized in that: The other side of the movable portion (412) is also fixedly connected to a tilt sensor (86).

9. The plasma cutting machine for steel structure according to claim 8, characterized in that: The outside of the hollow ring body (62) is fixedly connected to a piezoelectric ceramic ring (7), and the inside of the piezoelectric ceramic ring (7) is fixedly connected to a plurality of amplitude rods (71); one side of the Y-axial displacement portion (3) is also fixedly connected to an ultrasonic generating portion (72), and the ultrasonic generating portion (72) is connected to the plurality of amplitude rods (71).

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