Plasma arc cutting machine for pipe fitting machining

Abstract

The invention discloses a plasma arc cutting machine for pipe fitting machining, and relates to the technical field of plasma cutting. A plasma arc cutting machine for pipe fitting machining comprises a feeding mechanism used for conveying a pipe fitting in the direction of a plasma cutting gun; the rotation driving mechanism is used for driving the pipe fitting to rotate; the positioning mechanism is arranged at the position, away from the feeding mechanism, of the plasma cutting gun, and the plasma cutting gun has but not limited to the functions of being capable of horizontally, transversely and vertically ascending and descending; the semi-circular long cylinder structure has the positioning supporting function and the built-in dust removal function, smoke dust is directly captured through the suction channel extending to the inner cavity of the pipe fitting, and the dust removal efficiency is improved; the suction port is dynamically adjusted and automatically shrunk according to the length of the kerf, constant suction force is maintained, and the requirement of a high-power fan is avoided; a spiral groove is designed to induce smoke dust to rotate, so that self-cleaning is realized; and the supporting rotating rod automatically pops up at the cutting tail section, so that the pipe fitting is effectively prevented from drooping and deforming.

Description

Technical Field

[0001] The invention belongs to the technical field of plasma cutting, and in particular relates to a plasma arc cutting machine for pipe processing. Background Art

[0002] Plasma arc cutting is a melting cutting method that uses the heat of a high-temperature plasma arc to partially melt the metal at the workpiece incision, and uses the momentum of high-speed plasma to blow away the molten metal to form an incision. Its main advantage is that when cutting thin metals, the plasma cutting speed is fast, especially when cutting ordinary carbon steel thin plates, the speed can reach 5-6 times that of the oxygen cutting method, the cutting surface is smooth, the thermal deformation is small, and there is almost no heat-affected zone;

[0003] At present, when cutting pipe fittings, the existing plasma arc cutting equipment drives the pipe fittings to rotate through the existing rotary clamping device, and the plasma cutting gun performs circular cutting on the rotating pipe fittings. However, the cut steel pipe usually falls directly on the workbench or the ground, which is easy to roll around and cause damage to the pipe fittings. Therefore, a plasma arc cutting machine for pipe fitting processing is proposed. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a plasma arc cutting machine for pipe processing that can overcome the above problems or at least partially solve the above problems.

[0005] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: a plasma arc cutting machine for pipe processing, comprising: a feeding mechanism, used to transport the pipe toward the plasma cutting gun; a rotating drive mechanism, used to drive the pipe to rotate; a positioning mechanism, which is arranged at a position of the plasma cutting gun away from the feeding mechanism, and the plasma cutting gun includes but is not limited to the function of being able to rise and fall horizontally, laterally, and up and down; a dust removal mechanism, which is used to absorb dust when the plasma cutting gun cuts the pipe; the positioning mechanism includes a slidably arranged mounting plate, a sleeve is connected to the mounting plate, and a semicircular long cylinder is symmetrically arranged on one side of the sleeve close to the plasma cutting gun, so that the cut end of the pipe is sleeved on the semicircular long cylinder; the dust removal mechanism is connected to the symmetrical semicircular long cylinder.

[0006] Preferably, the feeding mechanism includes a mounting frame, on which a plurality of connecting plates are circumferentially connected, the connecting plate is rotatably connected to a connecting arm 2 via a torsion spring, and the connecting arm 2 is equipped with a motor and a feeding wheel connected to the motor via a synchronous belt.

[0007] Preferably, the connecting plate is rotatably connected to a connecting arm 1 via a torsion spring, and the connecting arm 1 is rotatably connected to a guide wheel.

[0008] Further, both ends of the sleeve are fixedly connected with a front mounting ring and a rear mounting ring respectively. An inner grinding ring and an outer grinding ring are mounted on the front mounting ring. An annular limiting grinding cavity is formed between the inner grinding ring and the outer grinding ring.

[0009] Preferably, the dust removal mechanism includes a connecting pipe fixedly connected to the mounting plate, and a dust suction bellows is mounted at one end of the connecting pipe.

[0010] Further, the sleeve is rotatably connected to the connecting pipe. A first spring is fixedly connected between the sleeve and the mounting plate. Limiting blocks are symmetrically and fixedly connected to the rear mounting ring. A first limiting rod and a second limiting rod are respectively mounted on the mounting plate and are used in correspondence with the limiting blocks to limit the rotation angle of the sleeve.

[0011] Further, one ends of the two semi-cylindrical tubes are in contact with one end of the connecting pipe. After the two semi-cylindrical tubes are fitted together, the inner diameter is smaller than the inner diameter of the connecting pipe.

[0012] Further, wedge-shaped blocks are fixedly connected to one ends of the two semi-cylindrical tubes. The wedge-shaped blocks are located inside the sleeve and are slidably connected through the sleeve. Guide rods are fixedly connected to both of the two semi-cylindrical tubes. The guide rods are slidably penetrated on the sleeve. A second spring is fixedly connected between the front end of the guide rod and the outer periphery of the sleeve. A trigger block is mounted on the mounting plate, and the trigger block is used to drive the two semi-cylindrical tubes to fit together when rotating.

[0013] Further, spiral grooves are formed in the inner diameters of the two semi-cylindrical tubes.

[0014] Further, support rotating rods are rotatably connected to the outer peripheries of the two semi-cylindrical tubes through torsion springs.

[0015] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0016] 1. For the plasma arc cutting machine for pipe fitting processing, by sleeving the semi-cylindrical tube at the end of the pipe fitting, its symmetrical structure provides radial support to offset the impact force of the plasma arc, avoiding uneven cuts caused by the vibration of the pipe fitting. After cutting is completed, the semi-cylindrical tube is still embedded in the cut pipe fitting. Through the backward movement of the mounting plate, the pipe fitting is automatically separated from the plasma cutting gun. At the same time, the semi-cylindrical tube temporarily supports the cut material to prevent it from falling and damaging the equipment or workpiece. By using the structure of the semi-cylindrical tube embedded inside the pipe fitting, the suction port of the dust removal mechanism is directly extended to the smoke and dust enrichment area (that is, the inner cavity of the pipe fitting), so that the semi-cylindrical tube is both a positioning component and a pipeline carrier of the dust removal mechanism, realizing the reuse of the structure and the integration of functions.

[0017] 2. The plasma arc cutting machine for pipe fitting processing can ensure that the pipe fitting remains stable on the sleeve after being cut by inserting one end of the pipe fitting into the annular limiting grinding cavity, further preventing the cut pipe fitting from falling off. Therefore, the inner grinding ring and the outer grinding ring can not only polish the outer circumference and inner diameter of the pipe fitting, but also prevent the cut pipe fitting from falling off.

[0018] 3. The plasma arc cutting machine for pipe fitting processing can not only drive the two semi-cylindrical tubes to fit together by the rotation of the sleeve, but also polish the burrs at the cut end of the pipe fitting through the inner grinding ring and the outer grinding ring. At the initial stage of cutting, the port diameter of the connecting pipe is large, and the suction of dust is given priority. At the later stage of cutting, the port of the connecting pipe shrinks, and at the same time, the inner grinding ring and the outer grinding ring do not rotate, and the grinding work of the pipe fitting starts. The cutting, dust removal and grinding are realized integrally, improving the process efficiency.

[0019] 4. The plasma arc cutting machine for pipe fitting processing can force the air flow to rotate tangentially through the spiral groove when the dust passes through the semi-cylindrical tube. In the rotating air flow, the particulate matter with a larger density is thrown towards the pipe wall by the centrifugal force. However, due to the continuous guidance of the spiral groove, the particulate matter cannot adhere statically, but advances forward with the eddy current. And the high-speed rotating air flow forms a continuous shear force on the pipe wall, stripping the attached particles and preventing deposition.

[0020] 5. The plasma arc cutting machine for pipe fitting processing can make the two semi-cylindrical tubes change from the horizontal direction to the vertical direction when the sleeve rotates to a certain angle and stops. And when the two semi-cylindrical tubes fit together, the supporting rotating rod is reset under the influence of the torsional spring rebound. The supporting rotating rod and the semi-cylindrical tube are at an angle close to perpendicular to support the pipe fitting to be cut, which can effectively weaken the problem of the pipe fitting sagging and resulting in an uneven cut.

[0021] The following further describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In the drawings:

[0023] Figure 1 is a three-dimensional structural schematic diagram of a plasma arc cutting machine for pipe fitting processing proposed by the present invention;

[0024] Figure 2 is a structural schematic diagram of a feeding mechanism of a plasma arc cutting machine for pipe fitting processing proposed by the present invention;

[0025] Figure 3 is a structural schematic diagram of a pusher of a plasma arc cutting machine for pipe fitting processing proposed by the present invention;

[0026] Figure 4 is a structural schematic diagram of a guide wheel and a feeding wheel of a plasma arc cutting machine for pipe fitting processing proposed by the present invention;

[0027] Figure 5 Structural schematic diagrams of the mounting frame and connecting plate of a plasma arc cutting machine for pipe fitting processing proposed by the present invention;

[0028] Figure 6 Structural schematic diagram of a trigger block of a plasma arc cutting machine for pipe fitting processing proposed by the present invention;

[0029] Figure 7 Structural schematic diagrams of a wedge block and a sleeve of a plasma arc cutting machine for pipe fitting processing proposed by the present invention;

[0030] Figure 8 Structural schematic diagrams of a first limiting rod and a second limiting rod of a plasma arc cutting machine for pipe fitting processing proposed by the present invention;

[0031] Figure 9 Structural schematic diagrams of a semi-circular long cylinder, a spiral groove, and a first spring of a plasma arc cutting machine for pipe fitting processing proposed by the present invention.

[0032] In the figure: 1. Feeding mechanism; 10. Pipe fitting; 11. Mounting frame; 12. Connecting plate; 13. First connecting arm; 14. Guide wheel; 15. Second connecting arm; 151. Motor; 152. Feeding wheel; 153. Synchronous belt;

[0033] 2. Plasma cutting gun;

[0034] 3. Positioning mechanism; 31. Mounting plate; 311. Guide rail; 312. Pushing member; 32. Sleeve; 321. Front mounting ring; 3211. Inner grinding ring; 3212. Outer grinding ring; 322. Rear mounting ring; 33. First spring; 34. Semi-circular long cylinder; 341. Wedge block; 3411. Guide inclined surface; 342. Guide rod; 343. Second spring; 344. Trigger block; 3441. First limiting rod; 3442. Second limiting rod; 3443. Limiting block; 35. Spiral groove; 351. Supporting rotating rod;

[0035] 4. Dust removal mechanism; 41. Connecting pipe; 42. Suction bellows;

[0036] 5. Mounting table. Detailed implementation manners

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0038] The following combines the appended Figure 1 - appended Figure 9, the technical solutions provided by each embodiment of the present invention are described in detail.

[0039] Embodiment 1: Refer to Figures 1-9 , a plasma arc cutting machine for pipe fitting processing, including an installation table 5, and further including: a feeding mechanism 1 installed on the installation table 5 for conveying the pipe fitting 10 towards the plasma cutting gun 2; a rotation driving mechanism for driving the pipe fitting 10 to rotate. The rotation driving mechanism is an electric three-jaw chuck. After the three-jaw chuck clamps the pipe fitting 10, the built-in motor drives the three-jaw chuck to rotate, which can drive the pipe fitting 10 to rotate. At the same time, the electric three-jaw chuck is installed and slides on the track and can horizontally traverse on the track. Therefore, when the feeding mechanism 1 drives the pipe fitting 10 to approach the plasma cutting gun 2, it can pull the electric three-jaw chuck to move together; a positioning mechanism 3 installed on the installation table 5, arranged at a position where the plasma cutting gun 2 is far from the feeding mechanism 1; a dust removal mechanism 4 for sucking dust when the plasma cutting gun 2 cuts the pipe fitting 10. The positioning mechanism 3 includes a sliding installation plate 31. A sleeve 32 is connected to the installation plate 31. On one side of the sleeve 32 close to the plasma cutting gun 2, semi-circular long cylinders 34 are symmetrically arranged to sleeved the cut end of the pipe fitting 10 on the semi-circular long cylinders 34; the dust removal mechanism 4 is connected to the symmetric semi-circular long cylinders 34. The dust removal mechanism 4 includes a connecting pipe 41 fixedly connected to the installation plate 31. One end of the connecting pipe 41 is installed with a dust suction bellows 42. The dust suction bellows 42 is connected to a suction device for sucking and filtering dust.

[0040] In this embodiment, the feeding mechanism 1 drives the pipe fitting 10 to move towards the plasma cutting gun 2 with a preset stroke, and one end of the pipe fitting 10 is sleeved on the two semi-circular long cylinders 34 on the positioning mechanism 3. Subsequently, the plasma cutting gun 2 cuts the pipe fitting 10. During the cutting process, the electric three-jaw chuck drives the pipe fitting 10 to rotate, thereby completing the circumferential cutting of the pipe fitting 10;

[0041] When the cutting is completed, the cut pipe fitting 10 is separated from the uncut pipe fitting 10. Since the two semi-circular long cylinders 34 are located in the cut pipe fitting 10, when separating, the cut pipe fitting 10 will not fall off during separation, but remains on the two semi-circular long cylinders 34. Subsequently, the positioning mechanism 3 moves backward away from the plasma cutting gun 2, increasing the distance between the cut pipe fitting 10 and the plasma cutting gun 2, thereby facilitating the removal of the pipe fitting 10 from the positioning mechanism 3.

[0042] During the cutting process, a large amount of yellow smoke will be generated at the cutting point between the plasma cutting gun 2 and the pipe 10. The smoke contains yellow powdery particles, which can cause harm to the human body. Therefore, existing plasma arc cutting machines are equipped with dust suction equipment to suck the generated yellow smoke. The suction pipeline of the existing dust suction equipment is usually installed on the plasma cutting gun 2 or set on one side of the cutting end of the plasma cutting gun 2. However, the principle of the plasma cutting gun 2 cutting the pipe 10 is to penetrate the wall thickness of the pipe 10, and the plasma cutting gun 2 will also spray auxiliary gas during cutting, which includes blowing the molten metal in the cutting part away from the incision to prevent the slag from re-condensing on the workpiece and ensure the cleanliness of the incision. Therefore, the sprayed auxiliary gas usually blows the yellow smoke into the hollow part of the pipe 10, causing the yellow smoke to be discharged from one end of the adjacent pipe 10, that is, near the positioning mechanism 3. This makes it difficult for the suction pipeline of the existing dust suction equipment to efficiently and comprehensively suck the yellow smoke, resulting in some yellow smoke overflowing and unable to be adsorbed.

[0043] Therefore, the device connects the pipeline of the dust removal mechanism 4 with one end of the semicircular long cylinder 34. While preventing the cut pipe 10 from falling through the semicircular long cylinder 34, it further utilizes the design of the semicircular long cylinder 34 being located inside the pipe 10 to lengthen the position of the pipeline of the dust removal mechanism 4, thereby achieving a more efficient smoke removal effect.

[0044] Therefore, the device inserts a semicircular cylinder 34 into the end of the pipe 10, and its symmetrical structure provides radial support to offset the impact force of the plasma arc and avoid uneven incisions caused by the vibration of the pipe 10. After the cutting is completed, the semicircular cylinder 34 is still embedded in the cut pipe 10, and the pipe 10 is automatically separated from the plasma cutting gun 2 through the backward movement of the mounting plate 31. At the same time, the semicircular cylinder 34 temporarily supports the cut material to prevent it from falling and damaging equipment or workpieces. By utilizing the structure of the semicircular cylinder 34 embedded in the pipe 10, the suction port of the dust removal mechanism 4 is directly extended to the smoke enrichment area (that is, the inner cavity of the pipe 10), so that the semicircular cylinder 34 is both a positioning component and a pipeline carrier of the dust removal mechanism 4, realizing structural reuse and functional integration.

[0045] Example 2: Reference Figure 4 or Figure 5 , a plasma arc cutting machine for pipe processing, which is basically the same as the embodiment 1, and further: the feeding mechanism 1 includes a mounting frame 11, and a plurality of connecting plates 12 are circumferentially connected to the mounting frame 11, and a connecting arm 2 15 is rotatably connected to the connecting plate 12 through a torsion spring, and a motor 151 and a feeding wheel 152 connected to the motor 151 through a synchronous belt 153 are installed on the connecting arm 2 15;

[0046] The pipe fitting 10 passes through the feeding channel formed circumferentially by a plurality of feeding wheels 152. The feeding wheels 152 are driven to rotate by the motor 151, that is, the pipe fitting 10 is driven to move horizontally;

[0047] In this embodiment, there are four groups of motors 151 and feeding wheels 152, and several motors 151 can be controlled separately according to the actual use situation. When controlling separately, it is advisable to select two symmetrical groups of motors 151;

[0048] A connecting arm one 13 is rotatably connected to the connecting plate 12 through a torsion spring. A guide wheel 14 is rotatably connected to the connecting arm one 13. There are four groups of guide wheels 14 for supporting the pipe fitting 10;

[0049] Among them, both the connecting arm one 13 and the connecting arm two 15 are rotatably installed on the connecting plate 12 by torsion springs, which enables the feeding wheels 152 and the guide wheels 14 to further clamp the pipe fitting 10.

[0050] In another embodiment, two groups of the connecting arm one 13 and the connecting arm two 15 located below the mounting frame 11 are fixedly connected to the connecting plate 12, and only two groups of the connecting arm one 13 and the connecting arm two 15 located above the mounting frame 11 are rotatably connected to the connecting plate 12 by torsion springs, which is more suitable for pipe fittings 10 with a certain weight and can improve the stability of the transportation of the pipe fittings 10.

[0051] Example 3: Refer to Figure 4 , a plasma arc cutting machine for pipe fitting processing, which is basically the same as Example 2. Further, both ends of the sleeve 32 are fixedly connected with a front mounting ring 321 and a rear mounting ring 322 respectively. An inner grinding ring 3211 and an outer grinding ring 3212 are installed on the front mounting ring 321. An annular limiting grinding cavity is formed between the inner grinding ring 3211 and the outer grinding ring 3212;

[0052] When the pipe fitting 10 approaches the positioning mechanism 3, the front end of the pipe fitting 10 will be inserted into the annular limiting grinding cavity, and the front end of the pipe fitting 10 abuts against the end face of the front mounting ring 321;

[0053] When cutting the pipe fitting 10, the pipe fitting 10 rubs against the inner grinding ring 3211 and the outer grinding ring 3212 during rotation, thereby realizing the grinding of the outer circumference and inner diameter of one end of the pipe fitting 10, and further reducing the subsequent process flow after cutting the pipe fitting 10.

[0054] At the same time, when one end of the pipe fitting 10 is inserted into the annular limiting grinding cavity, it can enable the pipe fitting 10 to be stably retained on the sleeve 32 after being cut, and further prevent the cut pipe fitting 10 from falling off;

[0055] Therefore, the provision of the inner grinding ring 3211 and the outer grinding ring 3212 can not only achieve the grinding of the outer circumference and inner diameter of the pipe fitting 10, but also prevent the cut pipe fitting 10 from falling off.

[0056] Example 4: Refer to Figure 6 , Figure 7 , Figure 8 , Figure 9 , a plasma arc cutting machine for pipe fitting processing, which is basically the same as Example 3. Further, the sleeve 32 is rotatably connected to the connecting pipe 41, the connecting pipe 41 is fixedly connected to the mounting plate 31, a first spring 33 is fixedly connected between the sleeve 32 and the mounting plate 31, and limiting blocks 3443 are symmetrically and fixedly connected to the rear mounting ring 322. A first limiting rod 3441 and a second limiting rod 3442 are respectively mounted on the mounting plate 31 and are used in correspondence with the limiting blocks 3443 to limit the rotation angle of the sleeve 32;

[0057] One end of each of the two semi-cylindrical tubes 34 is in contact with one end of the connecting pipe 41, and the inner diameter is smaller than that of the connecting pipe 41 after the two semi-cylindrical tubes 34 are fitted together.

[0058] Wedges 341 are fixedly connected to one end of each of the two semi-cylindrical tubes 34. The wedges 341 are located inside the sleeve 32 and are slidably connected through the sleeve 32. Guide rods 342 are fixedly connected to each of the two semi-cylindrical tubes 34. The guide rods 342 are slidably penetrated through the sleeve 32. A second spring 343 is fixedly connected between the front end of the guide rod 342 and the outer circumference of the sleeve 32. A trigger block 344 is mounted on the mounting plate 31, and the trigger block 344 is used to drive the two semi-cylindrical tubes 34 to fit together when rotating.

[0059] When cutting the pipe fitting 10, the front end of the pipe fitting 10 is inserted into the annular limiting grinding cavity. When the pipe fitting 10 rotates, affected by the frictional force between the front end of the pipe fitting 10 and the front mounting ring 321, the sleeve 32 will be driven to rotate and the first spring 33 will be twisted and store energy. When the sleeve 32 rotates, the limiting block 3443 disengages from the first limiting rod 3441 and approaches the second limiting rod 3442. When the limiting block 3443 abuts against the second limiting rod 3442, the sleeve 32 cannot continue to rotate, while the pipe fitting 10 will continue to rotate. Therefore, the pipe fitting 10 rubs against the inner grinding ring 3211 and the outer grinding ring 3212, forming the effect of grinding the outer circumference and inner diameter of the pipe fitting 10.

[0060] During the cutting process of the pipe fitting 10, there is also a problem. That is, when the cut is not formed, the cavity of the pipe fitting 10 is in a closed state, and the suction effect of the connecting pipe 41 is concentrated and the efficiency is relatively high. However, as the perimeter of the cut gradually increases, the leakage area where the cavity of the pipe fitting 10 communicates with the outside gradually increases, and a large amount of outside air rushes in from the cut, diluting the dust concentration and dispersing the suction airflow, resulting in a decline in the dust removal effect and a decrease in the suction efficiency of the dust removal mechanism 4. Therefore, during the air extraction and dust removal process of the connecting pipe 41, the suction efficiency and performance inside the cavity of the pipe fitting 10 will decline as the perimeter of the cut increases. In the prior art, high-power suction equipment is usually used to enhance the dust suction effect, but this will increase the cost of the enterprise, and the increase in the power of the suction equipment will also lead to an increase in the noise of the suction equipment;

[0061] In this embodiment, innovatively, without changing the power of the suction equipment, during the cutting process of the pipe fitting 10, the diameter of the front end port of the connecting pipe 41 is dynamically and automatically reduced according to the gradually increasing perimeter of the cut, forming a "throttling effect" at the suction end of the connecting pipe 41, so that as the perimeter of the cut increases, the diameter of the front end port of the connecting pipe 41 is gradually reduced, increasing the suction force at the front end port of the connecting pipe 41;

[0062] Specifically, when the pipe fitting 10 drives the sleeve 32 to rotate, the two semi-circular long cylinders 34 arranged on the sleeve 32 will rotate together. When the limiting block 3443 approaches the second limiting rod 3442, one end of the trigger block 344 contacts the guiding inclined surface 3411 of the wedge block 341. When the two are in contact, the wedge block 341 slides into the sleeve 32. During the process of the wedge block 341 sliding into the sleeve 32, the distance between the two semi-circular long cylinders 34 gradually decreases, thereby forming an effect of dynamically adjusting the suction of the dust in the cavity of the pipe fitting 10;

[0063] After the limiting block 3443 abuts against the second limiting rod 3442, the two semi-circular long cylinders 34 fit together, forming a circular suction reduction channel at one end of the connecting pipe 41. Therefore, the design of the semi-circular long cylinder 34 can not only prevent the cut pipe fitting 10 from falling, but also dynamically change the diameter of the suction end of the connecting pipe 41 according to the increase in the perimeter of the cut of the pipe fitting 10. Compared with the prior art, there is no need to increase the power of the suction equipment, and the dust removal rate remains stable during the entire cutting process, which is superior to the traditional fixed-diameter suction method and the high-power suction method.

[0064] In this embodiment, the rotation of the sleeve 32 not only drives the two semi-cylindrical tubes 34 to fit together, but also grinds the burrs at the cut end of the pipe fitting 10 through the inner grinding ring 3211 and the outer grinding ring 3212. At the initial stage of cutting, the port diameter of the connecting pipe 41 is large, and the suction of dust is preferably ensured. At the later stage of cutting, the port of the connecting pipe 41 shrinks, and at the same time, the inner grinding ring 3211 and the outer grinding ring 3212 do not rotate, and the grinding work of the pipe fitting 10 starts, realizing cutting, dust removal, and grinding integrally, and improving the process efficiency.

[0065] Example 5: Refer to Figure 6 、 Figure 7 、 Figure 8 、the figure, a plasma arc cutting machine for pipe fitting processing, which is basically the same as Example 4. Further: spiral grooves 35 are provided in the inner diameters of the two semi-cylindrical tubes 34. When the two semi-cylindrical tubes 34 are attached to each other, when the dust in the cavity of the pipe fitting 10 passes through the two semi-cylindrical tubes 34, it will rotate due to the design of the spiral grooves 35. The rotating dust can be accelerated, and it has a self-cleaning effect on the inner walls of the two semi-cylindrical tubes 34, the connecting pipe 41, and the dust suction bellows 42, effectively preventing the particulate matter in the dust from adhering to the inner walls of the semi-cylindrical tubes 34, the connecting pipe 41, and the dust suction bellows 42, resulting in the thickening of the inner walls and affecting the effect of sucking dust.

[0066] Therefore, in this embodiment, when the dust passes through the semi-cylindrical tube 34, the spiral groove 35 forces the air flow to rotate tangentially. In the rotating air flow, the particulate matter with a larger density is thrown towards the pipe wall by the centrifugal force. However, due to the continuous guidance of the spiral groove 35, the particulate matter cannot adhere statically, but advances forward with the eddy current. And the high-speed rotating air flow forms a continuous shear force on the pipe wall, peeling off the attached particles and preventing deposition.

[0067] Example 6: Refer to Figure 6 、 Figure 7 、 Figure 8 、the figure, a plasma arc cutting machine for pipe fitting processing, which is basically the same as Example 5. Further: support rotating rods 351 are rotatably connected to the outer circumferences of the two semi-cylindrical tubes 34 through torsion springs;

[0068] And when the pipe fitting 10 is about to be cut off, there is a problem. During cutting, a cut will be generated, and with the increase of the cutting circumference, the connection between the pipe fitting 10 to be cut off and the uncut pipe fitting 10 will decrease, and the pipe fitting 10 to be cut off will sag under the influence of its own weight, which will cause the pipe fitting 10 to be cut off to be prone to skew, resulting in an uneven cut, bevel cutting, burrs, etc. at the cut end of the pipe fitting 10;

[0069] Therefore, when the casing 32 rotates to a certain angle and stops in this embodiment, the two semi-cylindrical tubes 34 will change from the horizontal direction to the vertical direction. When the two semi-cylindrical tubes 34 are in contact with each other, the support rotating rod 351 is reset under the influence of the torsional spring rebound. The support rotating rod 351 and the semi-cylindrical tube 34 are at an angle approaching perpendicularity, supporting the pipe fitting 10 to be cut, which can effectively reduce the problem of the pipe fitting 10 sagging, resulting in an uneven cut.

[0070] Therefore, at the initial stage of cutting, the support rotating rod 351 remains in a retracted state. After the two semi-cylindrical tubes 34 are in contact with each other, the support rotating rod 351 is triggered to pop out and forms a 90-degree support angle with the semi-cylindrical tube 34 to bear the sagging force of the pipe fitting 10.

[0071] After cutting is completed, the pushing member 312 installed on the mounting table 5 pulls the mounting plate 31 slidably connected to the guide rail 311 away from the plasma cutting gun 2, facilitating the removal of the cut pipe fitting 10. The pushing member 312 includes, but is not limited to, a cylinder rod, a hydraulic rod, a lead screw, and other devices capable of reciprocating horizontally.

[0072] When the pipe fitting 10 is cut, the first spring 33 is reset, which will drive the casing 32 to flip, causing the limit block 3443 to collide with the first limiting rod 3441. After the casing 32 is reset, since the support rotating rod 351 and the semi-cylindrical tube 34 are perpendicular to each other, the support rotating rod 351 will continue to support the pipe fitting 10, preventing the pipe fitting 10 from falling. After the cut pipe fitting 10 is removed, the two semi-cylindrical tubes 34 are also reset under the push of the second spring 343.

[0073] The semi-cylindrical tube 34 structure of the present invention combines positioning support and built-in dust removal functions. The dust is directly captured through the suction channel extending into the inner cavity of the pipe fitting 10, improving the dust removal efficiency; the suction port is automatically reduced dynamically according to the cut seam length to maintain a constant suction force, avoiding the need for a high-power fan; the design of the spiral groove 35 induces the rotation of the dust, realizing self-cleaning; the support rotating rod 351 automatically pops out at the end of cutting, effectively preventing the pipe fitting 10 from sagging and deforming.

[0074] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the above-mentioned disclosed technical content within the scope of the technical solution of the present invention to make equivalent embodiments with equivalent changes. However, as long as it does not depart from the technical solution of the present invention, any simple modification, equivalent change, and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A plasma arc cutting machine for pipe processing, characterized in that: include: A feeding mechanism (1) is used to feed the pipe (10) toward the plasma cutting gun (2); A rotation driving mechanism, used for driving the pipe (10) to rotate; A positioning mechanism (3) is arranged at a position of the plasma cutting gun (2) away from the feeding mechanism (1); A dust removal mechanism (4) for removing dust when the plasma cutting gun (2) is cutting the pipe (10); The positioning mechanism (3) comprises a slidably arranged mounting plate (31), a sleeve (32) being connected to the mounting plate (31), and a semicircular long cylinder (34) being symmetrically arranged on one side of the sleeve (32) close to the plasma cutting gun (2), so that the cut end of the pipe (10) is sleeved on the semicircular long cylinder (34); The dust removal mechanism (4) is communicated with a symmetrical semicircular long cylinder (34).

2. A plasma arc cutting machine for pipe processing according to claim 1, characterized in that: The feeding mechanism (1) comprises a mounting frame (11), a plurality of connecting plates (12) are circumferentially connected to the mounting frame (11), a second connecting arm (15) is rotatably connected to the connecting plate (12) via a torsion spring, and a motor (151) and a feeding wheel (152) which is transmission-connected to the motor (151) via a synchronous belt (153) are mounted on the second connecting arm (15).

3. A plasma arc cutting machine for pipe processing according to claim 2, characterized in that: The connecting plate (12) is rotatably connected to a connecting arm (13) via a torsion spring, and the connecting arm (13) is rotatably connected to a guide wheel (14).

4. The plasma arc cutting machine for pipe processing according to claim 1, characterized in that: The two ends of the sleeve (32) are respectively fixedly connected with a front mounting ring (321) and a rear mounting ring (322); an inner grinding ring (3211) and an outer grinding ring (3212) are mounted on the front mounting ring (321); and an annular limited grinding cavity is formed between the inner grinding ring (3211) and the outer grinding ring (3212).

5. The plasma arc cutting machine for pipe processing according to claim 4, characterized in that: The dust removal mechanism (4) comprises a connecting pipe (41) fixedly connected to the mounting plate (31), and a dust collection bellows (42) is installed at one end of the connecting pipe (41).

6. The plasma arc cutting machine for pipe processing according to claim 5, characterized in that: The sleeve (32) is rotatably connected to the connecting tube (41); a spring 1 (33) is fixedly connected between the sleeve (32) and the mounting plate (31); a limiting block (3443) is symmetrically fixedly connected to the rear mounting ring (322); a limiting rod 1 (3441) and a limiting rod 2 (3442) are respectively installed on the mounting plate (31) and are used relative to the limiting block (3443) to limit the rotation angle of the sleeve (32).

7. The plasma arc cutting machine for pipe processing according to claim 6, characterized in that: One end of the two semicircular long cylinders (34) is in contact with one end of the connecting tube (41), and the inner diameter of the two semicircular long cylinders (34) after being in contact is smaller than the inner diameter of the connecting tube (41).

8. The plasma arc cutting machine for pipe processing according to claim 7, characterized in that: A wedge block (341) is fixedly connected to one end of the two semicircular long cylinders (34), and the wedge block (341) is located in the sleeve (32) and is slidably connected to the sleeve (32). A guide rod (342) is fixedly connected to the two semicircular long cylinders (34), and the guide rod (342) is slidably connected to the sleeve (32). A spring 2 (343) is fixedly connected between the front end of the guide rod (342) and the outer periphery of the sleeve (32). A trigger block (344) is installed on the mounting plate (31), and the trigger block (344) is used to drive the two semicircular long cylinders (34) to fit together when rotating.

9. The plasma arc cutting machine for pipe processing according to claim 8, characterized in that: The inner diameters of the two semicircular long cylinders (34) are provided with spiral grooves (35).

10. The plasma arc cutting machine for pipe processing according to claim 9, characterized in that: A supporting rotating rod (351) is rotatably connected on the outer circumference of the two semicircular long cylinders (34) via a torsion spring.

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