Plasma cutting equipment and method

Abstract

The invention provides plasma cutting equipment and method, and relates to the technical field of ion cutting, the plasma cutting equipment comprises a cutting main body and a blanking main body, the first side of the cutting main body is provided with a first window for a cut workpiece to penetrate out, and the second side of the cutting main body is provided with a second window for the cut workpiece to penetrate in; a first sealing device is mounted on the outer side of the first window, and a second sealing device is mounted on the outer side of the second window; the second sealing device comprises a collecting tank located at the lower end of the second window and an air blowing assembly located at the upper end of the second window, the collecting tank and the air blowing assembly extend in the length direction of the second window, and the air blowing assembly continuously blows out a sealing medium in the direction of the collecting tank to form an intangible sealing barrier. According to the plasma cutting device, smoke generated in the plasma cutting process is effectively prevented from overflowing, the plasma cutting process is simplified while the workshop operation environment is greatly improved, and production accidents are avoided.

Description

Technical Field

[0001] The present invention relates to the field of plasma cutting technology, and in particular to a plasma cutting device and method. Background Art

[0002] Plasma cutting equipment can efficiently cut materials, greatly improving cutting efficiency. However, plasma cutting equipment will produce a large amount of smoke while cutting. In order to ensure the cutting environment, the material needs to be placed in a relatively closed environment and the smoke needs to be efficiently extracted through negative pressure equipment.

[0003] For larger steel materials, which can be several meters or even more than ten meters long, in order to ensure stable feeding of the steel, a window of the same length needs to be opened on one side of the cutting equipment for the steel to pass through. Due to the large span of the window, traditional negative pressure equipment has difficulty in collecting the flue gas in a timely manner. Especially when the cutting power is high, some of the flue gas generated by cutting overflows from the window, affecting the cutting working environment.

[0004] By installing a static sealing curtain, the window size can be reduced and the smoke overflow situation can be improved. However, the static sealing curtain is difficult to achieve complete sealing and will hinder the rolling of steel. Installing a liftable sealing gate on the outside of the window can effectively solve the problems of the sealing curtain. However, for windows with a larger span, the span of the sealing gate is also large. The overall span and mass of the sealing gate are large, and the control is difficult. It is used for a long time in harsh environments, has a short service life, and production accidents often occur. Summary of the Invention

[0005] In response to the above problems, the present invention provides a plasma cutting device and method, which can effectively prevent the overflow of smoke generated during the plasma cutting process, greatly improve the workshop working environment, simplify the plasma cutting process, and avoid the occurrence of production accidents.

[0006] In order to solve the above problems, the technical solution adopted by the present invention is: A plasma cutting device is used to cut workpieces with a large length span, including a cutting body and a blanking body. A first window is opened on the first side of the cutting body for the cutting workpiece to pass through, and a second window is opened on the second side of the cutting body for the cutting workpiece to pass through. A first closing device is installed on the outside of the first window, and a second closing device is installed on the outside of the second window; the second closing device includes a collecting trough located at the lower end of the second window and a blowing assembly located at the upper end of the second window, and the collecting trough and the blowing assembly both extend along the length direction of the second window. The blowing assembly continuously blows out a sealing medium toward the collecting trough to form an invisible closed barrier, wherein the closed barrier can allow the cutting workpiece to pass through normally, a plasma cutting assembly is installed inside the cutting body, and a negative pressure joint is installed on the outside of the cutting body close to the side of the plasma cutting assembly, and the negative pressure joint is connected to a negative pressure device.

[0007] Preferably, the sealing medium is a mixture of clean sand and high-pressure gas, and a cleaning auxiliary device is provided in the collecting tank, which controls the cutting workpiece to be lifted and then rotated around its own axis.

[0008] Preferably, the cutting workpiece is tubular or cylindrical, and the cleaning auxiliary device includes a rotary drive component for controlling the cutting workpiece to rotate around its own axis and a lifting component for controlling the rotary drive component to rise and fall.

[0009] Preferably, the blowing assembly 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 assembly also includes a first driving shaft for controlling the deflection position of the first blowing nozzle and the second blowing nozzle.

[0010] Preferably, a first negative pressure collection opening is opened on the first side of the bottom of the collection tank, and a second negative pressure collection opening is opened on the second side. A diverter valve group is also provided inside the collection tank and located between the two collection openings. The diverter valve group is used to control the first negative pressure collection opening or the second negative pressure collection opening to be in a conducting state.

[0011] Preferably, the diverter valve assembly includes a diverter sealing plate and a second drive shaft for controlling the rotation of the diverter sealing plate, and the second drive shaft is electrically connected to the first drive shaft.

[0012] Preferably, there is a blowing opening above the first negative pressure collection opening and above the second negative pressure collection opening, and the two blowing openings are inclined inward. A magnetic control valve is installed inside the blowing opening, and permanent magnets are installed on both sides of the guide sealing plate.

[0013] Preferably, a guide block is fixed to the inner wall of the collecting tank, the guide block is opposite to the cleaning auxiliary device, and guide plates are installed on both the inner and outer sides of the blowing assembly.

[0014] Preferably, at least two sets of guide rails are installed on the upper end of the blanking body, and the two sets of guide rails are arranged obliquely toward the second window, and the cleaning auxiliary device is located on the extension path of the guide rails.

[0015] A plasma cutting method, using the above-mentioned plasma cutting equipment, includes the following steps: S1, controlling the cutting workpiece to pass through the second window into the cutting body, and controlling the cutting workpiece to be opposite to the plasma cutting component; S2, controlling the blowing component to continuously blow out the sealing medium toward the collection tank to form an invisible closed barrier; S3, continuously cutting the cutting workpiece by the plasma cutting component, and the cut workpiece passes through the first window to complete the unloading.

[0016] The beneficial effects of the present invention are: Compared with the existing technology, through the above-mentioned structural design, an invisible closed barrier can be formed on the side of the second window with a larger span through the collection groove and the blowing assembly. The closed barrier can allow the cut workpiece to pass normally while preventing the diffusion of smoke, and will not affect the feeding of the cut workpiece; the combination of the second closing device and the first closing device can effectively prevent the smoke generated during the plasma cutting process from overflowing, which greatly improves the workshop working environment, simplifies the plasma cutting process, and avoids the occurrence of production accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0018] Figure 2 For the present invention Figure 1 Schematic diagram of the main structure.

[0019] Figure 3 For the present invention Figure 1 Schematic diagram of the side structure.

[0020] Figure 4 For the present invention Figure 1 Schematic diagram of the top view structure.

[0021] Figure 5 For the present invention Figure 4 AA cross-sectional structural diagram.

[0022] Figure 6 For the present invention Figure 4 BB-direction cross-sectional structural diagram.

[0023] Figure 7 For the present invention Figure 4Schematic diagram of the CC-direction cross-sectional structure.

[0024] Figure 8 For the present invention Figure 5 Enlarged structural diagram at D.

[0025] Figure 9 For the present invention Figure 7 Enlarged structural diagram at E.

[0026] In the figure: 100, cutting body; 110, first window; 120, second window; 130, negative pressure connector; 140, high pressure connector; 150, first transmission member; 160, second transmission member; 200, unloading body; 210, guide rail; 300, cutting workpiece; 400, second closing device; 410, collecting trough; 411, guide block; 412, first negative pressure collecting opening; 413, second negative pressure collecting opening; 414, blowing opening; 420, blowing assembly; 421, first driving shaft; 422, first blowing nozzle; 423, second blowing nozzle; 500, guide valve group; 510, guide sealing plate; 520, second driving shaft; 600, cleaning auxiliary device; 610, lifting assembly; 620, rotation drive assembly; 700, first closing device; 710, sealing base; 720, sealing curtain. DETAILED DESCRIPTION

[0027] The present invention will be further described below with reference to the accompanying drawings and examples.

[0028] Plasma cutting equipment can efficiently cut materials, greatly improving cutting efficiency. However, plasma cutting equipment will produce a large amount of smoke while cutting. In order to ensure the cutting environment, the material needs to be placed in a relatively closed environment and the smoke needs to be efficiently extracted through negative pressure equipment.

[0029] For larger steel materials, which can be several meters or even more than ten meters long, in order to ensure stable feeding of the steel, a window of the same length needs to be opened on one side of the cutting equipment for the steel to pass through. Due to the large span of the window, traditional negative pressure equipment has difficulty in collecting the flue gas in a timely manner. Especially when the cutting power is high, some of the flue gas generated by cutting overflows from the window, affecting the cutting working environment.

[0030] By installing a static sealing curtain, the window size can be reduced and the smoke overflow situation can be improved. However, the static sealing curtain is difficult to achieve complete sealing and will hinder the rolling of steel. Installing a liftable sealing gate on the outside of the window can effectively solve the problems of the sealing curtain. However, for windows with a larger span, the span of the sealing gate is also large. The overall span and mass of the sealing gate are large, and the control is difficult. It is used for a long time in harsh environments, has a short service life, and production accidents often occur.

[0031] In order to solve the above problems, refer to the attached Figure 1 -Attached Figure 9 A plasma cutting device is provided for cutting a workpiece 300 with a large length span, comprising a cutting body 100 and a blanking body 200. 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. The workpiece 300 enters the cutting body 100 through the second window 120 for plasma cutting. A second transmission member 160 for controlling the linear movement of the workpiece 300 and a first transmission member 150 for controlling the rotation of the workpiece 300 around its own axis are installed in the cutting body 100. A lifting device is also installed to lift the workpiece 300 to the surfaces of the first transmission member 150 and the second transmission member 160; plasma cutting is completed while controlling the predetermined movement of the workpiece 300.

[0032] A first closing device 700 is installed on the outside of the first window 110, and a second closing device 400 is installed on the outside of the second window 120; the first closing device 700 and the second closing device 400 cooperate to form a relatively closed cutting chamber in the cutting body 100, which can effectively avoid the leakage of smoke generated during the plasma cutting process and effectively improve the working environment of the cutting workshop.

[0033] Specifically; the second closing 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. The collection tank 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 toward the collection tank 410 to form an invisible closed barrier, wherein the closed barrier can allow the cutting workpiece 300 to pass normally, and the sealing medium moves in a direction between the collection tank 410 and the blowing assembly 420 to form a closed barrier to prevent smoke from overflowing from the side of the second window 120; the sealing medium here can be selected as gas, and the second closing device 400 continuously generates a high-speed flowing gas wall on the side of the second window 120, which can effectively prevent smoke from diffusing; at the same time, through the above-mentioned structural design, the normal movement of the cutting workpiece 300 will not be hindered, and there is no need to design a mechanically movable sealing gate plate, the sealing effect is good, and the structure has a long service life.

[0034] A plasma cutting assembly is installed inside the cutting body 100, and a negative pressure connector 130 is installed on the outside of the cutting body 100 close to the side of the plasma cutting assembly. The negative pressure connector 130 is connected to a negative pressure device. The negative pressure device can quickly discharge the smoke generated by the plasma cutting assembly to prevent the smoke from remaining in the cutting body 100. The smoke generated by the cutting is discharged through the negative pressure device for centralized collection and purification, which effectively improves the working environment.

[0035] In summary, through the above-mentioned structural design, an invisible closed barrier can be formed on the side of the second window 120 with a larger span through the collection trough 410 and the blowing assembly 420. The closed barrier can allow the cut workpiece 300 to pass normally while preventing the diffusion of smoke, and will not affect the feeding of the cut workpiece 300; the combination of the second closing device 400 and the first closing device 700 can effectively prevent the smoke generated during the plasma cutting process from overflowing, which greatly improves the workshop working environment while simplifying the plasma cutting process and avoiding the occurrence of production accidents.

[0036] further; preferably, the sealing medium is a mixture of clean sand and high-pressure gas, and a cleaning auxiliary device 600 is provided in the collection tank 410, and the cleaning auxiliary device 600 is controlled by the cutting auxiliary device 300 to be lifted and then rotated around its own axis.

[0037] While the cleaning auxiliary device 600 controls the directional rotation of the cut workpiece 300 after it is lifted, the mixed medium can be sprayed out through the blowing component 420. The mixed medium directly acts on the surface of the cut workpiece 300. The continuous impact can flush out the oxidizing substances produced by the oxidation of the surface of the cut workpiece 300, thereby ensuring the cleanliness of the surface of the cut workpiece 300.

[0038] Through the above-mentioned structural design, the surface of the cutting workpiece 300 is cleaned before plasma cutting of the cutting workpiece 300, thereby 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 body 100 and the blanking body 200, thereby improving the overall efficiency of the cutting workpiece 300 processing and reducing the volume of the equipment.

[0039] The cutting workpiece 300 is tubular or cylindrical, and 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 rotation drive assembly 620 to rise and fall.

[0040] The rotating drive assembly 620 here can be selected as two groups of electric rollers arranged at intervals, which can carry the cutting workpiece 300 and control the directional rotation of the cutting workpiece 300; the lifting assembly 610 here can be selected as a hydraulic telescopic rod, which can control the rotating drive assembly 620 and the cutting workpiece 300 to rise and fall synchronously as a whole, thereby facilitating the rotation control of the cutting workpiece 300.

[0041] The cleaning auxiliary devices 600 here can be symmetrically arranged in two or more groups to enhance the bearing effect on the columnar solid cut workpiece 300 .

[0042] 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 are located on the same virtual arc line, and can be located on the same virtual circumference line. The air blowing assembly 420 also includes a first driving shaft 421 for controlling the deflection position of the first air blowing nozzle 422 and the second air blowing nozzle 423. The first driving shaft 421 can be used to adjust the first air blowing nozzle 422 or the second air blowing nozzle 423 to be opposite to the cutting workpiece 300.

[0043] During the cleaning process of the cut workpiece 300, the second air blowing nozzle 423 is first controlled to be opposite to the cut workpiece 300, and large-sized cleaning sand is blown toward the surface of the cut workpiece 300 through the second air blowing nozzle 423. During the process of the cut workpiece 300 rotating around its own axis, primary sandblasting and rust removal can be performed; then, the first air blowing nozzle 422 is controlled to be directed toward the cut workpiece 300, and small-sized cleaning sand can be blown out through the first air blowing nozzle 422. Secondary sandblasting and rust removal can be performed on the cut workpiece 300 after rough polishing, thereby removing most of the oxidized substances on the surface of the cut workpiece 300, enhancing the cleanliness of the surface of the cut workpiece 300, and improving the quality and efficiency of subsequent plasma cutting of the cut workpiece 300.

[0044] At the same time, the combination of primary sandblasting and secondary sandblasting can greatly improve the surface quality of the cut workpiece 300. The cut workpiece 300 after plasma cutting can be directly used for subsequent heating, forging and other processes.

[0045] Moreover, through the above-mentioned structural design, there is no need to arrange the first blowing nozzle 422 and the second blowing nozzle 423 at intervals. The first driving shaft 421 can control the angular position of the deflection of the first blowing nozzle 422 and the second blowing nozzle 423, so that a closed barrier can be formed at a constant position, thereby reducing the volume of the equipment. At the same time, cleaning sand of different sizes can fall from a constant position, and there is no need to open collection troughs 410 at different positions, thereby reducing the size of the collection trough 410 and improving the effect of collecting cleaning sand of different sizes.

[0046] In order to realize the separate collection of clean sand of different sizes and reduce the workload of subsequent screening of clean sand; a first negative pressure collection opening 412 is opened on the first side of the bottom of the collection tank 410, and a second negative pressure collection opening 413 is opened on the second side. A diverter valve group 500 is also provided inside the collection tank 410 and located between the two collection openings. The first negative pressure collection opening 412 or the second negative pressure collection opening 413 is controlled to be in a conducting state by the diverter valve group 500. When one of the negative pressure collection openings is in a conducting state, the other negative pressure collection opening is in a closed state, thereby realizing the separate collection of clean sand of different sizes.

[0047] Refer to the attached Figure 9 When the second air blowing nozzle 423 is opposite to the cutting workpiece 300, the first negative pressure collection opening 412 is controlled to be in a conductive state, so that large-sized cleaning sand can be collected in a centralized manner; on the contrary, when the first air blowing nozzle 422 is opposite to the cutting workpiece 300, small-sized cleaning sand can be collected separately through the second negative pressure collection opening 413.

[0048] Specifically, the diverter valve group 500 includes a diverter sealing plate 510 and a second drive shaft 520 for controlling the rotation of the diverter sealing plate 510. The second drive shaft 520 is electrically connected to the first drive shaft 421. By controlling the electrical connection between the second drive shaft 520 and the first drive shaft 421, automatic control of the two can be achieved, thereby realizing intelligent automatic control of plasma cutting.

[0049] The first negative pressure collection opening 412 and the second negative pressure collection opening 413 are located on the same horizontal plane, and both are located on the rotation path of the guide sealing plate 510. Figure 9 In the tilted state shown, 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 controlled to be in a closed state, thereby realizing automatic guidance of the cleaning sand.

[0050] Through the above-mentioned structural design, there is no need to design separate valves in the first negative pressure collection opening 412 and the second negative pressure collection opening 413. The conduction control can be completed by controlling a group of guide sealing plates 510 to tilt in different directions. This is simple and convenient, and greatly improves the effect and efficiency of the conduction control.

[0051] Furthermore, the inclined guide sealing plate 510 can guide the fallen cleaning sand and accelerate it to enter the corresponding negative pressure collection opening for centralized collection, thereby avoiding the mixing of cleaning sand of different sizes in the collection tank 410.

[0052] It should be noted here that the bottom of the collection tank 410 can be designed to be arc-shaped, which can be adapted to the rotating guide sealing plate 510, or flexible buffer pads or elastic airbags can be installed on both sides of the guide sealing plate 510. After the guide sealing plate 510 rotates to the extreme position, it can be against the inner wall of the collection tank 410 to enhance the sealing of the overall structure.

[0053] Blowing openings 414 are provided above the first negative pressure collection opening 412 and above the second negative pressure collection opening 413. Both blowing openings 414 are inclined inwards. A magnetic control valve is installed inside the blowing opening 414. Permanent magnets are installed on both sides of the guide sealing plate 510. When the guide sealing plate 510 is rotated to the extreme position, the permanent magnet can be opposite to the magnetic control valve, controlling the corresponding magnetic control valve to be in a conductive state, and controlling the corresponding blowing opening 414 to blow out airflow.

[0054] Through the above-mentioned structural design, after the guide sealing plate 510 is in a tilted state, the blowing opening 414 on the higher tilted side can be in a conductive state, and air can be blown out from its inside. The blown air can accelerate the movement of the cleaning sand on the surface of the guide sealing plate 510, and accelerate the movement of the cleaning sand to the corresponding negative pressure collection opening, which can reduce the reserved time for switching the guide sealing plate 510 and improve the efficiency of switching and adjusting the guide sealing plate 510.

[0055] A guide block 411 is fixed on the inner wall of the collection trough 410, and the guide block 411 is opposite to the cleaning auxiliary device 600. The guide blocks 411 here are located on both sides, which can guide the fallen cleaning sand, allowing it to fall from both sides to the middle position, and finally be collected by the negative pressure collection opening, thereby avoiding the residue of cleaning sand; guide plates are installed on both sides of the blowing component 420, and the cleaning sand can be guided by the guide plates to ensure that the cleaning sand can move along the predetermined path and fall onto the surface of the cutting workpiece 300 to complete rust removal and cleaning.

[0056] It should be noted here that the impact position of the cleaning sand can be controlled to be biased towards the inside or outside, and the cleaning sand can move toward the same side after colliding with the cutting workpiece 300, avoiding dispersion to both sides after colliding with the arc center of the top of the cutting workpiece 300, which can reduce the difficulty of subsequent collection of the cleaning sand; similarly, a baffle can be designed on the path of the cleaning sand to collect the cleaning sand in a centralized manner, thereby reducing the size of the collection tank 410 design.

[0057] At least two sets of guide rails 210 are installed at the upper end of the blanking body 200. The two sets of guide rails 210 are arranged obliquely toward the second window 120. The cleaning auxiliary device 600 is located on the extension path of the guide rails 210. The cutting workpiece 300 with a circular cross-section can roll along the surface of the guide rails 210 and roll to the side of the cleaning auxiliary device 600. The cutting workpiece 300 can be limited by the cleaning auxiliary device 600, and then the cutting workpiece 300 can be lifted and rotated to achieve continuous cleaning.

[0058] For some heavy-weight cutting workpieces 300, retractable limiting protrusions can be designed on the surface of the guide rail 210 to reduce the impact of the cutting workpiece 300 on the cleaning auxiliary device 600 during rolling, ensuring the normal stability of the overall structure.

[0059] The present invention will be further described below in conjunction with the cutting method.

[0060] A plasma cutting method, using the above-mentioned plasma cutting equipment, comprises the following steps: S1. Control the cutting workpiece 300 to pass through the cutting 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 a lifting device, and the cutting workpiece 300 is placed on the surface 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.

[0061] S2. Control the blowing assembly 420 to continuously blow out the sealing medium toward the collection tank 410 to form an invisible closed barrier; the second window 120 and one side of the first window 110 are both in a closed state, which can prevent smoke from overflowing. At the same time, the closed barrier formed by the collection tank 410 and the blowing assembly 420 will not affect the normal feeding of the cutting workpiece 300.

[0062] S3. The workpiece 300 is continuously cut by the plasma cutting assembly, and the workpiece 300 after cutting passes through the first window 110 to complete the unloading. While cutting, the generated smoke can be collected by the negative pressure connector 130 under centralized negative pressure, and the smoke can be discharged in time. 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 airway between the high-pressure connector 140 and the negative pressure connector 130, which can quickly collect the smoke generated at various positions in the cutting body 100 to prevent the smoke from overflowing and affecting the working environment.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection 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 trough (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 trough (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 trough (410) to form an invisible sealing barrier, wherein the sealing barrier can allow a cut workpiece (300) to pass through 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.

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 2, characterized in that: 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).

5. The plasma cutting equipment according to claim 4, characterized in that: 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.

6. The plasma cutting equipment according to claim 5, 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).

7. The plasma cutting equipment according to claim 6, 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).

8. 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).

9. 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).

10. A plasma cutting method, characterized in that: Using the plasma cutting device according to any one of claims 1 to 9 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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