A rotating bracket for plasma cutting pipe fittings

Abstract

This invention provides a rotating support for tubes used in plasma cutting, belonging to the technical field of plasma cutting equipment. It includes a guide rail, a drive base, and a scissor arm. Both ends of the scissor arm are connected to rollers for supporting the tube material. Two protective covers are provided on the outer side of each roller, and the roller and the protective covers are coaxially arranged. The protective covers are configured to rotate around the rollers. By providing two protective covers on the outer side of the rollers and incorporating torsion springs that apply elastic thrust to the protective covers, and by rotating the protective covers to contact the tube material, the torsion springs apply elastic potential energy to the protective covers in the direction of tube rotation. During the cutting process, the protective covers remain in contact with the tube material, protecting the rollers and effectively preventing molten slag from adhering to them.

Description

Technical Field

[0001] This invention belongs to the technical field of plasma cutting equipment, specifically referring to a rotating bracket for plasma cutting pipe fittings. Background Technology

[0002] A plasma pipe cutter is a CNC machine that uses a high-temperature plasma arc (temperatures can reach tens of thousands of degrees Celsius) to precisely cut metal pipes. It is specially designed for the processing of intersection lines, beveling, opening and cutting of materials such as stainless steel, carbon steel and aluminum pipes. Its core technology lies in the automatic cutting of pipes with complex three-dimensional trajectories by forming a plasma beam through high-energy ionized gas and combining it with a multi-axis linkage CNC system.

[0003] Large plasma pipe cutting machines need to be equipped with brackets to support the pipes and prevent them from sagging or bending due to excessive span.

[0004] Currently, plasma pipe cutting machines generate a large amount of high-temperature molten slag during cutting. The molten slag easily adheres to the surface of the rollers, causing unevenness on the rollers. When the pipe is rotated for cutting, it will cause radial runout of the pipe, affecting the cutting accuracy. Summary of the Invention

[0005] In view of the above situation and to overcome the defects of the prior art, the purpose of the present invention is to provide a rotating bracket for plasma cutting tubes, so as to at least partially solve the problems mentioned in the background art.

[0006] The technical solution adopted by this invention is as follows: This invention proposes a rotating bracket for plasma cutting tubes, comprising:

[0007] A guide rail is provided with multiple drive bases and scissor arms, wherein the scissor arms are driven by the drive bases;

[0008] Both ends of the top of the scissor arm are connected to rollers for supporting the load.

[0009] The idler roller is provided with two protective covers on its outer side. The idler roller and the protective covers are arranged coaxially with each other, and the protective covers are configured to be able to rotate around the idler roller.

[0010] An air guide gap for airflow is provided between the idler roller and the protective cover. An air groove is provided at the middle position of the idler roller. Multiple circumferentially evenly distributed first air holes are provided in the air groove. A central shaft is provided at the center of the idler roller. An air supply channel for supplying air to the interior of the idler roller is provided on the central shaft.

[0011] Furthermore, the end faces of both ends of the idler roller are provided with multiple circumferentially evenly distributed second air holes, so that the two ends of the idler roller can form an annular air curtain.

[0012] Furthermore, the second air hole is located at the edge of the end face of both ends of the idler roller, and both ends of the protective cover are provided with air distribution plates extending to the end face of the idler roller. The air distribution plates are configured to cover the second air hole along the axial direction of the idler roller, so that the airflow blown out by the second air hole can act on the air distribution plates and be dispersed.

[0013] Furthermore, the central shaft is connected to the scissor arm, the idler roller is rotatably connected to the central shaft, and the idler roller is connected to the scissor arm through the central shaft.

[0014] Furthermore, one end of the protective cover is provided with a bushing rotatably connected to the central shaft, and the bushing is provided with a connecting rod connected to the protective cover.

[0015] Furthermore, one end of the protective cover is provided with a limiting ring rotatably connected to the central shaft, the scissor arm is connected with a bolt for locking the limiting ring, and a torsion spring is provided between the bushing and the limiting ring.

[0016] Furthermore, the air supply channel includes an air supply chamber and a connecting hole. The air supply chamber is located inside the central shaft, and one end of the air supply chamber is connected to an external air supply device through an air nozzle. The connecting hole is located on the side wall of the central shaft, and both ends of the connecting hole are connected to the air supply chamber and the inside of the idler roller, respectively.

[0017] Furthermore, the inner side of the protective cover is provided with a scraper that fits against the outer side of the idler roller.

[0018] Furthermore, a vibration module for vibration is provided on the outer side of the protective cover.

[0019] Beneficial effects:

[0020] 1. By setting two protective covers on the outside of the idler roller and setting torsion springs that can apply elastic thrust to the protective covers, the protective covers can be rotated to contact the pipe and the torsion springs can apply elastic potential energy to the protective covers in the direction of pipe rotation. During the cutting process, the protective covers can always be in contact with the pipe, which can protect the idler roller and effectively prevent the slag generated during cutting from adhering to the idler roller.

[0021] 2. By utilizing the arc-shaped air guide gap formed between the protective cover and the idler roller, when gas is conveyed into the air guide gap through the first air hole set on the idler roller, the airflow can flow along the outer wall of the idler roller. The high-speed airflow blows away the molten slag falling on the outer wall of the idler roller. At the same time, the flowing airflow cools the idler roller, preventing the high temperature generated by cutting from causing the idler roller to deform. Attached Figure Description

[0022] Figure 1This is a schematic diagram of the structure of a rotating bracket for plasma cutting of pipes according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the installation position of the roller in a rotating bracket for plasma cutting of pipes according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of a protective cover installed on a roller in a rotating bracket for plasma cutting of pipes according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the internal structure of the roller in a rotating bracket for plasma cutting of pipes according to an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the connection structure between the protective cover and the central shaft in a rotating bracket for plasma cutting pipes according to an embodiment of the present invention;

[0027] Figure 6 This is an axial sectional view of the roller in a rotating bracket for plasma cutting of pipes according to an embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram illustrating the state of a rotating bracket for plasma cutting pipes when the protective cover is not in contact with the pipe, as proposed in an embodiment of the present invention.

[0029] Figure 8 This is a schematic diagram showing the contact state between the protective cover and the pipe in a rotating bracket for plasma cutting according to an embodiment of the present invention.

[0030] The components include: 1. Guide rail; 2. Drive base; 21. Mounting seat; 22. Lead screw; 23. Motor; 24. Support rod; 3. Scissor arm; 4. Idler roller; 401. Air groove; 402. First air hole; 403. Second air hole; 5. Central shaft; 501. Connecting hole; 51. Air nozzle; 6. Protective cover; 61. Scraper; 62. Air distribution plate; 601. Air guide gap; 7. Bushing; 71. Connecting rod; 8. Limiting ring; 81. Torsion spring; 9. Vibration module.

[0031] The accompanying drawings are provided to further understand the embodiments and form part of the specification. They are used together with the embodiments for explanation and do not constitute a limitation on the embodiments. Detailed Implementation

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection.

[0033] In the description of the embodiments, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments.

[0034] Combination Figure 1 As shown, an embodiment of the present invention provides a rotating bracket for plasma cutting of pipe fittings, including a guide rail 1, a drive base 2, and a scissor arm 3.

[0035] The guide rail 1 is provided with multiple drive bases 2, and the drive bases 2 can move and adjust their positions along the guide rail 1. Each drive base 2 is provided with a scissor arm 3, and each scissor arm 3 has two rollers 4 at its top ends. The pipe to be cut is supported by the two rollers 4. Driven by the drive base 2, the top ends of the scissor arm 3 can move closer or further away from each other. When the top ends of the scissor arm 3 move closer to each other, its height also increases. Correspondingly, when the top ends of the scissor arm 3 move further away from each other, its height also decreases.

[0036] Thus, when cutting pipes, if the pipe diameter is small, the scissor arms 3 can be adjusted so that the two rollers 4 are closer together, providing stable support for small-diameter pipes. At the same time, the height of the pipe can be increased so that the center of the pipe corresponds to the center of the clamping chuck of the cutting equipment, allowing the clamping chuck of the cutting equipment to hold the pipe. If the pipe diameter is large, the scissor arms 3 can be adjusted so that the two rollers 4 are further apart, providing stable support for large-diameter pipes. At the same time, the height of the pipe can be decreased so that the center of the pipe corresponds to the center of the clamping chuck of the cutting equipment, allowing the clamping chuck of the cutting equipment to hold the pipe.

[0037] Combination Figure 2 As shown, the drive base 2 includes a mounting base 21, a lead screw 22, and a motor 23. The lead screw 22 is installed in the mounting base 21, and the two ends of the lead screw 22 are provided with threads in opposite directions. The bottom ends of the scissor arms 3 are respectively connected to the threads at both ends of the lead screw 22. When the lead screw 22 rotates, the bottom ends of the scissor arms 3 move closer or further away from each other, so that the distance and height of the top ends of the scissor arms 3 can be adjusted.

[0038] The motor 23 is located at one end of the mounting base 21, and the output end of the motor 23 is connected to the lead screw 22, so that the lead screw 22 is driven to rotate by the motor 23.

[0039] Furthermore, the mounting base 21 has a support rod 24 parallel to the lead screw 22 inside. The bottom ends of the scissor arm 3 are connected to the lead screw 22 and slidably connected to the support rod 24. When the lead screw 22 drives the bottom ends of the scissor arm 3 to move, the bottom ends of the scissor arm 3 slide along the support rod 24, and the support rod 24 provides auxiliary support for the scissor arm 3.

[0040] Combination Figure 2 and Figure 3 As shown, two protective covers 6 are provided on the outer side of the idler roller 4. The idler roller 4 and the protective covers 6 are arranged coaxially with each other, and the protective covers 6 are configured to rotate around the idler roller 4. When the idler roller 4 supports the pipe, the contact position between the pipe and the idler roller 4 is usually located above the corresponding side of the two idler rollers 4 (e.g., Figure 7 and Figure 8 (As shown).

[0041] When supporting the pipe, rotate the two protective covers 6 on the outside of the idler roller 4 in two directions until they contact the pipe (e.g., Figure 8 As shown in the figure, the two sides of the contact area between the idler roller 4 and the pipe are protected by the protective cover 6, which effectively prevents the molten slag generated during cutting from adhering to the idler roller 4.

[0042] Combination Figure 3 , Figure 4 and Figure 6 As shown, an air guide gap 601 for airflow is provided between the idler roller 4 and the protective cover 6. An air groove 401 is provided at the middle position of the idler roller 4. Multiple circumferentially evenly distributed first air holes 402 are provided in the air groove 401. A central shaft 5 is provided at the center of the idler roller 4. An air supply channel for supplying air to the interior of the idler roller 4 is provided on the central shaft 5.

[0043] Air is continuously supplied to the interior of the idler roller 4 through the air supply channel inside the central shaft 5. As the air pressure increases, the gas inside the idler roller 4 is output through the first air hole 402 and flows from the air groove 401 to the air guide gap 601. Since the air guide gap 601 is an arc shape that fits the idler roller 4, the airflow can flow along the outer wall of the idler roller 4. By increasing the air pressure supplied, the flow velocity of the airflow on the outer wall of the idler roller 4 is increased. The high-speed airflow blows away the molten slag that falls on the outer wall of the idler roller 4. At the same time, the flowing airflow cools the idler roller 4 to prevent the high temperature generated by cutting from causing deformation of the idler roller 4.

[0044] In a specific embodiment, the air supply channel includes an air supply chamber and a connecting hole 501. The central shaft 5 is configured as a tubular structure with one end open, forming an air supply chamber with one end open inside. One end of the air supply chamber is connected to an external air supply device through an air nozzle 51. The central shaft 5 is provided with a connecting hole 501, and the two ends of the connecting hole 501 are respectively connected to the air supply chamber and the inside of the idler roller 4. The external air supply device is connected to the air inlet end of the air nozzle 51 through a pipe. The exhaust end of the air nozzle 51 is located inside the central shaft 5. The external air supply device uses the central shaft 5 as an air delivery pipeline to deliver gas into the inside of the idler roller 4.

[0045] It should be noted that the two ends of the central shaft 5 are connected to the scissor arms 3, and the idler roller 4 is rotatably connected to the central shaft 5 through bearings. The idler roller 4 is connected to the scissor arms 3 through the central shaft 5. When the pipe is being rotated and cut, the idler roller 4 is dragged and rotated by the pipe, while the central shaft 5 is not dragged and rotated.

[0046] Combination Figure 4 As shown, the end faces of both ends of the idler roller 4 are provided with multiple circumferentially evenly distributed second air holes 403. Air is continuously supplied to the interior of the idler roller 4 through the central shaft 5. As the air pressure increases, the second air holes 403 at both ends of the idler roller 4 can exhaust air outward, so that the two ends of the idler roller 4 can form an annular air curtain. By increasing the air pressure supplied, the air curtain at both ends of the idler roller 4 has a large flow rate, which can blow away the molten slag generated by cutting, prevent the molten slag from falling into the bearings at both ends of the idler roller 4, and prevent the idler roller 4 from jamming and unable to rotate.

[0047] Combination Figure 3 and Figure 5 As shown, the second air hole 403 is located at the edge of the end face of both ends of the roller 4. Both ends of the protective cover 6 are provided with air distribution plates 62 extending to the end face of the roller 4. The air distribution plates 62 are configured to cover the second air hole 403 along the axial direction of the roller 4, so that the airflow blown out by the second air hole 403 can act on the air distribution plates 62 and be dispersed to form a more uniform air curtain.

[0048] Thus, during cutting, the external air supply device supplies air to the idler roller 4 through the central shaft 5. As the air pressure increases, the gas inside the idler roller 4 is output through the first air hole 402 and flows through the air groove 401 to the air guide gap 601, allowing the airflow to flow along the outer wall of the idler roller 4. The high-speed airflow blows away the molten slag that falls on the outer wall of the idler roller 4. At the same time, the flowing airflow cools the idler roller 4, preventing the high temperature generated by cutting from deforming the idler roller 4. Meanwhile, the second air holes 403 at both ends of the idler roller 4 can exhaust air outward, so that the two ends of the idler roller 4 can form an annular air curtain. By increasing the air pressure supplied, the air curtain at both ends of the idler roller 4 has a large flow velocity, which can blow away the molten slag generated by cutting, preventing the molten slag from falling into the bearings at both ends of the idler roller 4 and preventing the idler roller 4 from jamming and unable to rotate.

[0049] Combination Figure 5 As shown, one end of the protective cover 6 is provided with a bushing 7 rotatably connected to the central shaft 5. The bushing 7 is provided with a connecting rod 71 connected to the protective cover 6. Through the bushing 7 and the connecting rod 71, the protective cover 6 is rotatably connected to the central shaft 5. The protective cover 6 can rotate around the central shaft 5. Since the central shaft 5 and the idler roller 4 are coaxial with each other, the protective cover 6 can rotate around the idler roller 4.

[0050] Furthermore, one end of the protective cover 6 is provided with a limiting ring 8 rotatably connected to the central shaft 5, and a bolt for locking the limiting ring 8 is connected to the scissor arm 3. A torsion spring 81 is provided between the bushing 7 and the limiting ring 8, and the torsion spring 81 applies a rotational elastic thrust to the bushing 7.

[0051] Thus, when placing the pipe, the limiting rings 8 at both ends of the rotating central shaft 5, under the supporting force of the torsion spring 81, drag the bushing 7 and the protective cover 6 to rotate, and cause the two protective covers 6 on the roller 4 to rotate away from the contact area (e.g., Figure 7 As shown), thus exposing the upper side (contact area) of the two idler rollers 4 corresponding to each other; after the pipe is placed, by rotating the limiting rings 8 at both ends of the central shaft 5 in the opposite direction, under the supporting force of the torsion spring 81, the bushing 7 and the protective cover 6 are dragged to rotate, and the two protective covers 6 on the idler roller 4 are rotated towards the contact area (as shown). Figure 8 As shown), until the protective cover 6 contacts the pipe, and then continue to rotate the limiting ring 8 a certain distance to allow the torsion spring 81 to store force. The torsion spring 81 can apply elastic potential energy to the protective cover 6 in the direction of rotation towards the pipe. During the cutting process, the protective cover 6 can always be in contact with the pipe, playing the role of protecting the roller 4 and effectively preventing the molten slag generated during cutting from adhering to the roller 4.

[0052] Combination Figure 5 and Figure 6 As shown, the inner side of the protective cover 6 is provided with a scraper 61 that fits against the outer side of the idler roller 4. As the steel pipe is rotated and cut, the rotating steel pipe can drag the idler roller 4 to rotate. At this time, the scraper 61 can clean the outer side of the idler roller 4, scrape off the adhering slag, and through a preset program, drive the pipe to rotate at least once after each cut. Correspondingly, the idler roller 4 can be dragged and rotated, and the scraper 61 is used to clean the idler roller 4 around once periodically.

[0053] Furthermore, the outer side of the protective cover 6 is provided with a vibration module 9 for vibration. When the drive pipe rotates once and the scraper 61 cleans the idler roller 4, the vibration module 9 is turned on to make the protective cover 6 vibrate, effectively removing the slag that is difficult to scrape off.

[0054] In a specific embodiment, the vibration module 9 includes multiple vibration motors and a protective shell. The multiple vibration motors are evenly arranged on the protective cover 6 along the length of the protective cover 6. The protective shell is placed on the outside of the multiple vibration motors to protect them and prevent high-temperature molten slag from affecting them.

[0055] The working principle of this invention is as follows: When cutting pipes, if the pipe diameter is small, the scissor arm 3 can be adjusted so that the two rollers 4 are closer together, providing stable support for small-diameter pipes. At the same time, the height of the pipe can be increased so that the center of the pipe corresponds to the center of the clamping chuck of the cutting equipment, allowing the clamping chuck of the cutting equipment to hold the pipe. If the pipe diameter is large, the scissor arm 3 can be adjusted so that the two rollers 4 are further apart, providing stable support for large-diameter pipes. At the same time, the height of the pipe can be decreased so that the center of the pipe corresponds to the center of the clamping chuck of the cutting equipment, allowing the clamping chuck of the cutting equipment to hold the pipe.

[0056] When placing the pipe, the limiting rings 8 at both ends of the rotating central shaft 5, under the supporting force of the torsion spring 81, drag the bushing 7 and the protective cover 6 to rotate, and cause the two protective covers 6 on the idler roller 4 to rotate away from the contact area (e.g., Figure 7 As shown), thus exposing the upper side (contact area) of the two idler rollers 4 corresponding to each other; after the pipe is placed, by rotating the limiting rings 8 at both ends of the central shaft 5 in the opposite direction, under the supporting force of the torsion spring 81, the bushing 7 and the protective cover 6 are dragged to rotate, and the two protective covers 6 on the idler roller 4 are rotated towards the contact area (as shown). Figure 8 As shown), until the protective cover 6 contacts the pipe, and then continue to rotate the limiting ring 8 a certain distance to allow the torsion spring 81 to store force. The torsion spring 81 can apply elastic potential energy to the protective cover 6 in the direction of rotation towards the pipe. During the cutting process, the protective cover 6 can always be in contact with the pipe, playing the role of protecting the roller 4 and effectively preventing the molten slag generated during cutting from adhering to the roller 4.

[0057] During cutting, the external air supply device supplies air to the idler roller 4 through the central shaft 5. As the air pressure increases, the gas inside the idler roller 4 is output through the first air hole 402 and flows through the air groove 401 to the air guide gap 601, so that the airflow can flow along the outer wall of the idler roller 4. The high-speed airflow blows away the molten slag that falls on the outer wall of the idler roller 4. At the same time, the flowing airflow cools the idler roller 4 to prevent the high temperature generated by cutting from deforming the idler roller 4. Meanwhile, the second air holes 403 at both ends of the idler roller 4 can exhaust air outward, so that the two ends of the idler roller 4 can form an annular air curtain. By increasing the air pressure supplied, the air curtain at both ends of the idler roller 4 has a large flow velocity, which can blow away the molten slag generated by cutting and prevent the molten slag from falling into the bearings at both ends of the idler roller 4, thus preventing the idler roller 4 from jamming and unable to rotate.

[0058] In summary, by setting two protective covers 6 on the outside of the idler roller 4 and setting torsion springs 81 that can apply elastic thrust to the protective covers 6, by rotating the protective covers 6 to contact the pipe and using the torsion springs 81 to apply elastic potential energy to the protective covers 6 in the direction of pipe rotation, the protective covers 6 can always be in contact with the pipe during the cutting process, thus protecting the idler roller 4 and effectively preventing the molten slag generated during cutting from adhering to the idler roller 4.

[0059] By utilizing the arc-shaped air guide gap 601 formed between the protective cover 6 and the idler roller 4, when gas is conveyed into the air guide gap 601 through the first air hole 402 set on the idler roller 4, the airflow can flow along the outer side wall of the idler roller 4. The high-speed airflow blows away the molten slag falling on the outer side wall of the idler roller 4. At the same time, the flowing airflow cools the idler roller 4, preventing the high temperature generated by cutting from causing deformation of the idler roller 4.

[0060] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0061] The embodiments have been described above, and such description is not restrictive. The figures shown are only one embodiment, and the actual structure is not limited to this. In short, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the inventive spirit, such design should fall within the scope of protection.

Claims

1. A rotating bracket for tube fittings used in plasma cutting, characterized in that, include: The guide rail (1) is provided with multiple drive bases (2) and scissor arms (3), and the scissor arms (3) are driven by the drive bases (2); Both ends of the top of the scissor arm (3) are connected to rollers (4) for supporting the support material. The idler roller (4) is provided with two protective covers (6) on its outer side. The idler roller (4) and the protective cover (6) are arranged coaxially with each other, and the protective cover (6) is configured to be able to rotate around the idler roller (4). An air guide gap (601) for airflow is provided between the idler roller (4) and the protective cover (6). An air groove (401) is provided at the middle position of the idler roller (4). A plurality of circumferentially evenly distributed first air holes (402) are provided in the air groove (401). A central shaft (5) is provided at the center of the idler roller (4). An air supply channel for supplying air to the interior of the idler roller (4) is provided on the central shaft (5). The end faces of both ends of the idler roller (4) are provided with a plurality of circumferentially evenly distributed second air holes (403), so that the two ends of the idler roller (4) can form an annular air curtain. The second air hole (403) is located at the edge of the end face of both ends of the idler roller (4). Both ends of the protective cover (6) are provided with air distribution plates (62) extending to the end face of the idler roller (4). The air distribution plates (62) are configured to cover the second air hole (403) along the axial direction of the idler roller (4), so that the airflow blown out by the second air hole (403) can act on the air distribution plates (62) and be dispersed.

2. The rotating bracket for plasma cutting pipes according to claim 1, characterized in that: The central shaft (5) is connected to the scissor arm (3), the idler roller (4) is rotatably connected to the central shaft (5), and the idler roller (4) is connected to the scissor arm (3) through the central shaft (5).

3. The rotating bracket for plasma cutting pipes according to claim 1, characterized in that: One end of the protective cover (6) is provided with a bushing (7) rotatably connected to the central shaft (5), and the bushing (7) is provided with a connecting rod (71) connected to the protective cover (6).

4. The rotating bracket for plasma cutting pipes according to claim 3, characterized in that: One end of the protective cover (6) is provided with a limiting ring (8) rotatably connected to the central shaft (5), and a bolt for locking the limiting ring (8) is connected to the scissor arm (3). A torsion spring (81) is provided between the bushing (7) and the limiting ring (8).

5. The rotating bracket for plasma cutting pipes according to claim 1, characterized in that: The air supply channel includes an air supply chamber and a connecting hole (501). The air supply chamber is located inside the central shaft (5). One end of the air supply chamber is connected to an external air supply device through an air nozzle (51). The connecting hole (501) is located on the side wall of the central shaft (5). The two ends of the connecting hole (501) are respectively connected to the air supply chamber and the interior of the idler roller (4).

6. The rotating bracket for plasma cutting pipes according to claim 1, characterized in that: The inner side of the protective cover (6) is provided with a scraper (61) that fits against the outer side of the idler roller (4).

7. The rotating bracket for plasma cutting pipes according to claim 6, characterized in that: The outer side of the protective cover (6) is provided with a vibration module (9) for vibration.

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