A plasma cutting device and method

Abstract

The present invention provides a plasma cutting device and method. The present invention relates to the technical field of ion cutting, and includes a cutting main body and a blanking main body. A first window for the cutting workpiece to pass through is opened on the first side of the cutting main body, and a second window for the cutting workpiece to penetrate into is opened on the second side of the cutting main body. A first closing device is installed outside the first window, and a second closing device is installed outside the second window; the second closing device includes a collection tank located at the lower end of the second window and a blowing component located at the upper end of the second window. Both the collection tank and the blowing component extend along the length direction of the second window, and the blowing component continuously blows out a closing medium towards the collection tank to form an invisible closing barrier. The invention effectively avoids the overflow of the fumes generated during the plasma cutting process, greatly improves the workshop operation environment, simplifies the plasma cutting process, and avoids the occurrence of production accidents.

Description

Technical Field

[0001] The present invention relates to the technical field of ion cutting, and particularly to a plasma cutting device and method. Background Art

[0002] The plasma cutting device can efficiently cut materials, greatly improving the cutting efficiency. However, a large amount of fumes are generated during the cutting process of the plasma cutting device. To ensure the cutting environment, the material needs to be placed in a relatively enclosed environment and the fumes need to be efficiently extracted by a negative pressure device.

[0003] For large-sized steel materials, which are several meters or even more than ten meters long, in order to ensure the stable feeding of the steel, a window with the same length dimension needs to be opened on one side of the cutting device for the steel to pass through. Due to the large size span of this window, it is difficult for traditional negative pressure devices to collect the fumes in a timely manner by negative pressure. Especially when the cutting power is relatively large, some of the fumes generated during cutting overflow from this window, affecting the cutting operation environment.

[0004] By installing a static sealing curtain, the window size can be reduced and the situation of fume overflow can be improved. However, the static sealing curtain is difficult to achieve complete sealing and will also hinder the rolling feeding of the steel. Installing a liftable sealing gate outside the window can effectively solve the problems existing in the sealing curtain. However, for a window with a large span, the span of the sealing gate is also large. The overall span of the sealing gate is large and the mass is large, making it difficult to control. When used in a harsh environment for a long time, the service life is short and production accidents occur frequently. Summary of the Invention

[0005] Aiming at the above problems, the present invention provides a plasma cutting device and method, which can effectively avoid the overflow of fumes generated during the plasma cutting process, greatly improve the workshop operation environment, simplify the plasma cutting process, and avoid the occurrence of production accidents.

[0006] To solve the above problems, the technical solutions adopted by the present invention are as follows:

[0007] A plasma cutting device for cutting workpieces with a large length span, comprising a cutting main body and a blanking main body. A first window for the cutting workpiece to pass through is opened on the first side of the cutting main body, and a second window for the cutting workpiece to penetrate into is opened on the second side of the cutting main body. A first closing device is installed outside the first window, and a second closing device is installed outside the second window. The second closing device includes a collecting groove at the lower end of the second window and a blowing component at the upper end of the second window. Both the collecting groove and the blowing component extend along the length direction of the second window. The blowing component continuously blows out a sealing medium towards the collecting groove to form an invisible sealing barrier. Among them, the sealing barrier can allow the cutting workpiece to pass through normally. A plasma cutting component is installed inside the cutting main body, and a negative pressure connector is installed outside the cutting main body on one side close to the plasma cutting component. The negative pressure connector is connected to a negative pressure device.

[0008] Preferably, the sealing medium is a mixed medium of cleaning sand and high-pressure gas. A cleaning auxiliary device is arranged in the collecting groove, and the cutting workpiece is controlled to lift and rotate directionally around its own axis through the cleaning auxiliary device.

[0009] Preferably, the cutting workpiece is tubular or columnar. The cleaning auxiliary device includes a rotation driving component for controlling the cutting workpiece to rotate around its own axis and a lifting component for controlling the lifting of the rotation driving component.

[0010] Preferably, the blowing component includes a first blowing nozzle for blowing out small-sized cleaning sand and a second blowing nozzle for blowing out large-sized cleaning sand. The first blowing nozzle and the second blowing nozzle are relatively fixed and located on the same virtual arc. The blowing component further includes a first driving rotating shaft for controlling the deflection positions of the first blowing nozzle and the second blowing nozzle.

[0011] Preferably, a first negative pressure collecting opening is opened on the first side of the bottom of the collecting groove, and a second negative pressure collecting opening is opened on the second side. A flow guiding valve group is further arranged inside the collecting groove between the two collecting openings, and the first negative pressure collecting opening or the second negative pressure collecting opening is controlled to be in a conducting state through the flow guiding valve group.

[0012] Preferably, the flow guiding valve group includes a flow guiding sealing plate and a second driving rotating shaft for controlling the rotation of the flow guiding sealing plate. The second driving rotating shaft is electrically connected to the first driving rotating shaft.

[0013] Preferably, blowing openings are opened above the first negative pressure collecting opening and above the second negative pressure collecting opening. Both of the two blowing openings are inclined towards the inside. A magnetically controlled valve is installed inside the blowing openings, and permanent magnets are installed on both sides of the flow guiding sealing plate.

[0014] Preferably, a diversion block is fixed to the inner wall of the collection tank, the diversion block faces the cleaning auxiliary device, and diversion plates are installed on both the inner and outer sides of the air blowing assembly.

[0015] Preferably, at least two groups of guiding tracks are installed at the upper end of the blanking main body, and the two groups of guiding tracks are arranged obliquely towards the direction of the second window, and the cleaning auxiliary device is located on the extension path of the guiding tracks.

[0016] A plasma cutting method using the above-mentioned plasma cutting equipment includes the following steps: S1. Control the cutting workpiece to penetrate into the cutting main body from the second window, and control the cutting workpiece to face the plasma cutting assembly; S2. Control the air blowing assembly to continuously blow out a sealing medium towards the collection tank to form an invisible sealing barrier; S3. Continuously cut the cutting workpiece through the plasma cutting assembly, and the cut cutting workpiece exits from the first window to complete blanking.

[0017] The beneficial effects of the present invention are as follows:

[0018] Compared with the prior art, through the above structural design, an invisible sealing barrier can be formed on one side of the second window with a large span through the collection tank and the air blowing assembly. While avoiding the diffusion of smoke, the sealing barrier can allow the cutting workpiece to pass through normally without affecting the feeding of the cutting workpiece; the combination of the second sealing device and the first sealing device can effectively prevent the smoke generated during plasma cutting from overflowing, greatly improving the workshop operation environment while simplifying the plasma cutting process and avoiding the occurrence of production accidents. Description of the Drawings

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0020] Figure 2 For the present invention Figure 1 The front view structural schematic diagram.

[0021] Figure 3 For the present invention Figure 1 The side view structural schematic diagram.

[0022] Figure 4 For the present invention Figure 1 The top view structural schematic diagram.

[0023] Figure 5 For the present invention Figure 4 The sectional view taken along the A-A direction of the present invention.

[0024] Figure 6 For the present invention Figure 4 The sectional view taken along the B-B direction of the present invention.

[0025] Figure 7 For the present inventionFigure 4 Schematic cross-sectional structure diagram in the C-C direction.

[0026] Figure 8 For the present invention Figure 5 Schematic enlarged structure diagram at D of the present invention.

[0027] Figure 9 For the present invention Figure 7 Schematic enlarged structure diagram at E of the present invention.

[0028] In the figure: 100, cutting main body; 110, first window; 120, second window; 130, negative pressure connector; 140, high-pressure connector; 150, first transmission member; 160, second transmission member; 200, blanking main body; 210, guiding track; 300, workpiece to be cut; 400, second closing device; 410, collecting tank; 411, flow guiding block; 412, first negative pressure collecting opening; 413, second negative pressure collecting opening; 414, air blowing opening; 420, air blowing assembly; 421, first driving rotating shaft; 422, first air blowing nozzle; 423, second air blowing nozzle; 500, flow guiding valve group; 510, flow guiding sealing plate; 520, second driving rotating shaft; 600, cleaning auxiliary device; 610, lifting assembly; 620, rotating driving assembly; 700, first closing device; 710, sealing base; 720, sealing curtain. Detailed implementation manners

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] Through the plasma cutting equipment, materials can be efficiently cut, greatly improving the cutting efficiency. However, a large amount of fumes will be generated during the cutting process of the plasma cutting equipment. In order to ensure the cutting environment, the materials need to be placed in a relatively enclosed environment and the fumes need to be efficiently extracted through negative pressure equipment.

[0031] For large-sized steel materials, which are several meters or even more than ten meters long, in order to ensure the stable blanking of the steel materials, a window with the same length dimension needs to be opened on one side of the cutting equipment for the steel materials to pass through; due to the large size span of this window, it is difficult for traditional negative pressure equipment to timely collect the fumes by negative pressure. Especially when the cutting power is relatively large, some of the fumes generated during cutting overflow from this window, affecting the cutting operation environment.

[0032] By installing a static sealing curtain, the window size can be reduced, and the situation of flue gas overflow can be improved. However, it is difficult for the static sealing curtain to achieve complete sealing, and it will also have an obstructive impact on the rolling and feeding of steel. Installing a liftable sealing gate outside the window can effectively solve the problems existing in the sealing curtain. However, for a window with a large span, the span of the sealing gate is also large. The overall span of the sealing gate is large, the mass is large, and the control difficulty is high. When used in a harsh environment for a long time, the service life is short, and production accidents occur frequently.

[0033] To solve the above problems, referring to the attached Figure 1 - attached Figure 9 , a plasma cutting device for cutting a cutting workpiece 300 with a large length span, including a cutting main body 100 and a feeding main body 200. A first window 110 for the cutting workpiece 300 to pass through is opened on the first side of the cutting main body 100, and a second window 120 for the cutting workpiece 300 to enter is opened on the second side of the cutting main body 100. The cutting workpiece 300 enters the cutting main body 100 from the second window 120 for plasma cutting. A second transmission member 160 for controlling the linear movement of the cutting workpiece 300 and a first transmission member 150 for controlling the cutting workpiece 300 to rotate around its own axis are installed in the cutting main body 100. A lifting device is also installed to lift the cutting workpiece 300 to the surfaces of the first transmission member 150 and the second transmission member 160; while controlling the predetermined movement of the cutting workpiece 300, plasma cutting is completed.

[0034] A first closing device 700 is installed outside the first window 110, and a second closing device 400 is installed outside the second window 120; through the cooperation of the first closing device 700 and the second closing device 400, a relatively closed cutting chamber can be formed in the cutting main body 100, which can effectively avoid the leakage of flue gas generated during plasma cutting and effectively improve the working environment of the cutting workshop.

[0035] Specifically, the second sealing device 400 includes a collection tank 410 located at the lower end of the second window 120 and a blowing assembly 420 located at the upper end of the second window 120. Both the collection tank 410 and the blowing assembly 420 extend along the length direction of the second window 120. The blowing assembly 420 continuously blows out a sealing medium towards the collection tank 410 to form an invisible sealing barrier. The cutting workpiece 300 can normally pass through the sealing barrier. The sealing medium moves directionally between the collection tank 410 and the blowing assembly 420 to form a closed barrier, preventing flue gas from overflowing from one side of the second window 120. The sealing medium here can be selected as a gas. By continuously generating a high-speed flowing air wall on one side of the second window 120 through the second sealing device 400, the diffusion of flue gas can be effectively avoided. At the same time, through the above structural design, it will not hinder the normal movement of the cutting workpiece 300, and there is no need to design a mechanically moving sealing gate. The sealing effect is good, and the service life of the structure is long.

[0036] A plasma cutting assembly is installed inside the cutting body 100, and a negative pressure connector 130 is installed outside the cutting body 100 on the side close to the plasma cutting assembly. The negative pressure connector 130 is connected to a negative pressure device. Through the negative pressure device, the flue gas generated by the plasma cutting assembly during cutting can be quickly discharged, preventing the flue gas from remaining inside the cutting body 100. The flue gas generated by cutting is discharged through the negative pressure device for centralized collection and purification, effectively improving the working environment.

[0037] In summary, through the above structural design, an invisible sealing barrier can be formed on one side of the second window 120 with a large span through the collection tank 410 and the blowing assembly 420. The sealing barrier can prevent the diffusion of flue gas while allowing the cutting workpiece 300 to pass through normally, without affecting the feeding of the cutting workpiece 300. The combination of the second sealing device 400 and the first sealing device 700 can effectively prevent the flue gas generated during plasma cutting from overflowing, greatly improving the working environment in the workshop while simplifying the plasma cutting process and avoiding the occurrence of production accidents.

[0038] Furthermore, preferably, the sealing medium is a mixed medium of cleaning sand and high-pressure gas. A cleaning auxiliary device 600 is arranged in the collection tank 410 to control the lifting of the cutting workpiece 300 and its directional rotation around its own axis.

[0039] While controlling the lifting and directional rotation of the cutting workpiece 300 through the cleaning auxiliary device 600, the blowing assembly 420 can spray out the mixed medium. The mixed medium directly acts on the surface of the cutting workpiece 300, and continuous impact can wash away the oxidized substances generated on the surface of the cutting workpiece 300 due to oxidation, ensuring the cleanliness of the surface of the cutting workpiece 300.

[0040] Through the above structural design, the surface of the cutting workpiece 300 is cleaned before plasma cutting, improving the efficiency of plasma cutting and the quality of the cutting end face. At the same time, the rust removal structure and the cutting structure can be compactly installed in the cutting main body 100 and the blanking main body 200, improving the comprehensive efficiency of the processing of the cutting workpiece 300 and reducing the volume of the equipment.

[0041] The cutting workpiece 300 is tubular or columnar. The cleaning auxiliary device 600 includes a rotation drive assembly 620 for controlling the cutting workpiece 300 to rotate around its own axis and a lifting assembly 610 for controlling the lifting of the rotation drive assembly 620.

[0042] Here, the rotation drive assembly 620 can be selected as two sets of electric rollers arranged at intervals. Through the electric rollers, the cutting workpiece 300 can be carried and the directional rotation of the cutting workpiece 300 can be controlled. Here, the lifting assembly 610 can be selected as a hydraulic telescopic rod. Through the hydraulic telescopic rod, the rotation drive assembly 620 and the cutting workpiece 300 can be controlled to lift synchronously as a whole, facilitating the rotation control of the cutting workpiece 300.

[0043] Here, the cleaning auxiliary device 600 can be symmetrically arranged in two sets or multiple sets to enhance the bearing effect on the columnar solid cutting workpiece 300.

[0044] Furthermore, the air blowing assembly 420 includes a first air blowing nozzle 422 for blowing out small-sized cleaning sand and a second air blowing nozzle 423 for blowing out large-sized cleaning sand. The first air blowing nozzle 422 and the second air blowing nozzle 423 are relatively fixed and located on the same virtual arc line, and can be located on the same virtual circumferential line. The air blowing assembly 420 further includes a first driving rotating shaft 421 for controlling the deflection positions of the first air blowing nozzle 422 and the second air blowing nozzle 423. Through the first driving rotating shaft 421, the orientation of the first air blowing nozzle 422 or the second air blowing nozzle 423 relative to the cutting workpiece 300 can be adjusted.

[0045] During the cleaning process of the cutting workpiece 300, first control the second air blowing nozzle 423 to face the cutting workpiece 300, and blow out large-sized cleaning sand towards the surface of the cutting workpiece 300 through the second air blowing nozzle 423. During the rotation of the cutting workpiece 300 around its own axis, primary sandblasting and rust removal can be carried out. Subsequently, control the first air blowing nozzle 422 to face the cutting workpiece 300, and the first air blowing nozzle 422 can blow out small-sized cleaning sand, which can carry out secondary sandblasting and rust removal on the cutting workpiece 300 after rough polishing, removing most of the oxidized substances on the surface of the cutting workpiece 300, enhancing the cleanliness of the surface of the cutting workpiece 300, and improving the quality and efficiency of the subsequent plasma cutting of the cutting workpiece 300.

[0046] Meanwhile, through the combination of primary sandblasting rust removal and secondary sandblasting rust removal, the quality of the surface of the cutting workpiece 300 can be greatly improved, and the cutting workpiece 300 after plasma cutting can be directly used in subsequent processes such as heating and forging.

[0047] Moreover, through the above structural design, there is no need to arrange the first air blowing nozzle 422 and the second air blowing nozzle 423 at intervals. The first driving rotating shaft 421 can control the angular positions of the first air blowing nozzle 422 and the second air blowing nozzle 423 to deflect, and a closed barrier can be formed at a constant position, reducing the volume of the equipment. At the same time, cleaning sands of different sizes can fall from a constant position, without the need to open collection grooves 410 at different positions, reducing the size of the collection grooves 410 and improving the effect of collecting cleaning sands of different sizes.

[0048] In order to achieve the separate collection of cleaning sands of different sizes and reduce the workload of subsequent screening of cleaning sands, a first negative pressure collection opening 412 is opened on the first side at the bottom of the collection groove 410, and a second negative pressure collection opening 413 is opened on the second side. A diversion valve group 500 is also arranged inside the collection groove 410 between the two collection openings. The diversion valve group 500 controls the first negative pressure collection opening 412 or the second negative pressure collection opening 413 to be in a conducting state. When one of the negative pressure collection openings is in a conducting state, the other negative pressure collection opening is in a closed state, realizing the separate collection of cleaning sands of different sizes.

[0049] Refer to the attached Figure 9 When the second air blowing nozzle 423 faces the cutting workpiece 300, controlling the first negative pressure collection opening 412 to be in a conducting state can centrally collect large-sized cleaning sands. On the contrary, when the first air blowing nozzle 422 faces the cutting workpiece 300, the second negative pressure collection opening 413 can separately collect small-sized cleaning sands.

[0050] Specifically, the diversion valve group 500 includes a diversion sealing plate 510 and a second driving rotating shaft 520 for controlling the rotation of the diversion sealing plate 510. The second driving rotating shaft 520 is electrically connected to the first driving rotating shaft 421. Controlling the electrical connection between the second driving rotating shaft 520 and the first driving rotating shaft 421 can achieve the automatic control of the two, realizing the intelligent automatic control of plasma cutting.

[0051] The first negative pressure collection opening 412 and the second negative pressure collection opening 413 are on the same horizontal plane, and both are on the rotation path of the diversion sealing plate 510. When controlling the diversion sealing plate 510 to be in the inclined state shown in the attached Figure 9 figure, the first negative pressure collection opening 412 can be controlled to be in a conducting state, and the second negative pressure collection opening 413 can be in a closed state, realizing the automatic guiding of cleaning sands.

[0052] Through the above structural design, there is no need to separately design valves in the first negative pressure collection opening 412 and the second negative pressure collection opening 413. By controlling a set of diversion and sealing plates 510 to tilt in different directions, the conduction control can be completed, which is simple and convenient, and greatly improves the effect and efficiency of the conduction control.

[0053] Moreover, the inclined diversion and sealing plates 510 can guide the falling cleaning sand, accelerate its entry into the corresponding negative pressure collection opening for centralized collection, and avoid the mixing of cleaning sand of different sizes in the collection tank 410.

[0054] It should be noted here that the bottom of the collection tank 410 can be designed as an arc to be adapted to the rotating diversion and sealing plates 510, or flexible buffer pads or elastic air bags are installed on both sides of the diversion and sealing plates 510, so that they can abut against the inner wall of the collection tank 410 after the diversion and sealing plates 510 rotate to the limit position, enhancing the sealing performance of the overall structure.

[0055] Blowing openings 414 are provided above both the first negative pressure collection opening 412 and the second negative pressure collection opening 413. Both of the two blowing openings 414 are inclined inward. A magnetically controlled valve is installed inside the blowing openings 414, and permanent magnets are installed on both sides of the diversion and sealing plates 510. After the diversion and sealing plates 510 rotate to the limit position, the permanent magnets can face the magnetically controlled valves, controlling the corresponding magnetically controlled valves to be in a conducting state and controlling the corresponding blowing openings 414 to blow out airflows.

[0056] Through the above structural design, after the diversion and sealing plates 510 are in an inclined state, the blowing openings 414 on the higher inclined side can be in a conducting state, and airflows can be blown out from the inside. The blown airflows can accelerate the movement of the cleaning sand on the surface of the diversion and sealing plates 510, accelerate the movement of the cleaning sand into the corresponding negative pressure collection openings, reduce the reserved time for the switching of the diversion and sealing plates 510, and improve the efficiency of the switching adjustment of the diversion and sealing plates 510.

[0057] Diversion blocks 411 are fixed on the inner wall of the collection tank 410. The diversion blocks 411 face the cleaning auxiliary device 600. Here, the diversion blocks 411 are located on both sides, which can guide the falling cleaning sand, make it fall from both sides to the middle position, and finally be collected by the negative pressure collection openings, avoiding the residue of the cleaning sand; diversion plates are installed on both the inner and outer sides of the blowing assembly 420. Through the diversion plates, the cleaning sand can be guided to ensure that the cleaning sand can move along a predetermined path and fall onto the surface of the cutting workpiece 300 to complete rust removal and cleaning.

[0058] It should be noted here that the position where the cleaning sand impacts can be controlled to be biased towards the inner side or the outer side, and the cleaning sand after colliding with the cutting workpiece 300 can move towards the same side, avoiding being scattered towards both sides after colliding with the arc center at the top of the cutting workpiece 300, which can reduce the difficulty of collecting the cleaning sand subsequently; similarly, baffles can be designed on the path where the cleaning sand moves to centrally collect the cleaning sand, reducing the size of the collection tank 410 designed.

[0059] At least two groups of guiding rails 210 are installed at the upper end of the blanking main body 200. The two groups of guiding rails 210 are arranged obliquely towards the direction of the second window 120. The cleaning auxiliary device 600 is located on the extension path of the guiding rails 210. The cutting workpiece 300 with a circular cross-section can roll along the surface of the guiding rails 210 and roll to one side of the cleaning auxiliary device 600. Through the cleaning auxiliary device 600, the cutting workpiece 300 can be limited, and then the cutting workpiece 300 is lifted and rotated to achieve continuous cleaning.

[0060] For some cutting workpieces 300 with relatively large mass, retractable limiting protrusions can be designed on the surface of the guiding rails 210, which can reduce the impact of the cutting workpiece 300 on the cleaning auxiliary device 600 during the rolling process and ensure the normal stability of the overall structure.

[0061] The present invention will be further described below in combination with the cutting method.

[0062] A plasma cutting method using the above-mentioned plasma cutting equipment includes the following steps:

[0063] S1. Control the cutting workpiece 300 to penetrate into the cutting main body 100 from the second window 120, and control the cutting workpiece 300 to be opposite to the plasma cutting assembly. The cutting workpiece 300 can be lifted to a predetermined position by the lifting device, and the cutting workpiece 300 is placed on the surfaces of the first transmission member 150 and the second transmission member 160. The cutting is completed during the process of controlling the directional rotation and movement of the cutting workpiece 300.

[0064] S2. Control the blowing assembly 420 to continuously blow out a sealing medium towards the direction of the collection tank 410 to form an invisible sealing barrier; both sides of the second window 120 and the first window 110 are in a sealed state, which can avoid the overflow of flue gas. At the same time, the sealing barrier formed by the collection tank 410 and the blowing assembly 420 will not affect the normal feeding of the cutting workpiece 300.

[0065] S3. Continuously cut the workpiece 300 through the plasma cutting assembly. The cut workpiece 300 exits through the first window 110 to complete the blanking. During the cutting process, the generated flue gas can be centrally collected under negative pressure through the negative pressure connector 130 and discharged in a timely manner. For multi-point cutting, a high-pressure connector 140 can be installed on the opposite side of the negative pressure connector 130 to form a directional air duct between the high-pressure connector 140 and the negative pressure connector 130, enabling the rapid collection of flue gas generated at various positions within the cutting body 100 and preventing the flue gas from overflowing and affecting the working environment.

[0066] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A plasma cutting device for cutting a workpiece (300) with a large length span, comprising a cutting body (100) and a blanking body (200), wherein a first window (110) is provided on a first side of the cutting body (100) for the workpiece (300) to pass through, and a second window (120) is provided on a second side of the cutting body (100) for the workpiece (300) to pass through, wherein: A first sealing device (700) is installed on the outside of the first window (110), and a second sealing device (400) is installed on the outside of the second window (120); the second sealing device (400) comprises a collecting groove (410) located at the lower end of the second window (120) and a blowing assembly (420) located at the upper end of the second window (120); the collecting groove (410) and the blowing assembly (420) both extend along the length direction of the second window (120); the blowing assembly (420) continuously blows out a sealing medium in the direction of the collecting groove (410) to form an invisible sealing barrier, wherein the sealing barrier can allow the cut workpiece (300) to pass normally; a plasma cutting assembly is installed inside the cutting body (100); a negative pressure joint (130) is installed on the outside of the cutting body (100) near a side of the plasma cutting assembly; and the negative pressure joint (130) is connected to a negative pressure device; The air blowing assembly (420) comprises a first air blowing nozzle (422) for blowing out small-sized cleaning sand and a second air blowing nozzle (423) for blowing out large-sized cleaning sand, the first air blowing nozzle (422) and the second air blowing nozzle (423) being relatively fixed and located on the same virtual arc line, and the air blowing assembly (420) further comprises a first driving shaft (421) for controlling the deflection position of the first air blowing nozzle (422) and the second air blowing nozzle (423); A first negative pressure collection opening (412) is provided on a first side of the bottom of the collection tank (410), and a second negative pressure collection opening (413) is provided on a second side. A diversion valve group (500) is also provided inside the collection tank (410) and is located between the two collection openings. The diversion valve group (500) is used to control the first negative pressure collection opening (412) or the second negative pressure collection opening (413) to be in a conducting state; When the second air blowing nozzle is opposite to the cutting workpiece, the first negative pressure collection opening is controlled to be in a conducting state to collect large-sized cleaning sand in a centralized manner; when the first air blowing nozzle is opposite to the cutting workpiece, small-sized cleaning sand is collected separately through the second negative pressure collection opening.

2. The plasma cutting equipment according to claim 1, characterized in that: The sealing medium is a mixed medium of clean sand and high-pressure gas. A cleaning auxiliary device (600) is arranged in the collection tank (410), and the cleaning auxiliary device (600) is used to control the cut workpiece (300) to be lifted and then rotated around its own axis.

3. The plasma cutting equipment according to claim 2, characterized in that: The cutting workpiece (300) is tubular or columnar, and the cleaning auxiliary device (600) comprises a rotation drive component (620) for controlling the cutting workpiece (300) to rotate around its own axis, and a lifting component (610) for controlling the lifting of the rotation drive component (620).

4. The plasma cutting equipment according to claim 1, characterized in that: The diversion valve assembly (500) comprises a diversion sealing plate (510) and a second driving rotating shaft (520) for controlling the rotation of the diversion sealing plate (510), wherein the second driving rotating shaft (520) is electrically connected to the first driving rotating shaft (421).

5. The plasma cutting equipment according to claim 4, characterized in that: An air blowing opening (414) is provided above the first negative pressure collection opening (412) and above the second negative pressure collection opening (413); both of the air blowing openings (414) are inclined inwards; a magnetic control valve is installed inside the air blowing opening (414); and permanent magnets are installed on both sides of the guide sealing plate (510).

6. The plasma cutting equipment according to claim 2, characterized in that: A guide block (411) is fixed to the inner wall of the collecting tank (410), the guide block (411) is opposite to the auxiliary cleaning device (600), and guide plates are installed on both the inner and outer sides of the blowing assembly (420).

7. The plasma cutting equipment according to claim 2, characterized in that: At least two groups of guide rails (210) are installed on the upper end of the material discharge body (200), and the two groups of guide rails (210) are arranged obliquely toward the second window (120), and the cleaning auxiliary device (600) is located on the extension path of the guide rails (210).

8. A plasma cutting method, characterized in that: Using the plasma cutting device according to any one of claims 1 to 7 comprises the following steps: S1, controlling the cutting workpiece (300) to pass through the second window (120) into the cutting body (100), and controlling the cutting workpiece (300) to be opposite to the plasma cutting assembly; S2, controlling the air blowing component (420) to continuously blow out the sealing medium in the direction of the collecting tank (410) to form an invisible sealing barrier; S3, continuously cutting the cut workpiece (300) by means of a plasma cutting assembly, and the cut workpiece (300) passes through the first window (110) after cutting, completing the unloading.

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