Automatic cutting device for circular air pipe machining

Abstract

The automatic cutting device comprises a machine box, the circular air pipe and a laser cutter body, a supporting seat is arranged on the left side of the machine box, a limiting assembly is arranged at the upper end of the supporting seat, and a rectangular annular frame is fixedly arranged on the inner wall of the left side of the machine box in a penetrating mode; and a guide mechanism is arranged in the rectangular annular frame. The circular air pipe is erected on the limiting rolling wheels and penetrates through the rectangular annular frame, the multiple guide rollers are matched with the strip-shaped wear-resisting protrusions to conduct displacement pushing on the circular air pipe, manual operation is replaced for pushing cutting, time and labor are saved, potential safety hazards are reduced, the circular air pipe is guided into the machine box through the guide mechanism in cooperation with the limiting assembly, and the working efficiency is improved. And the hydraulic buffer is inserted into the circular inserting groove and abuts against the buffering push block, so that the second hydraulic cylinder drives the positioning roller to be matched with the hydraulic buffer to clamp and position the circular air pipe, the regularity of the cutting end face of the circular air pipe is prevented from being affected, and the cutting effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of fire-fighting air duct processing, and in particular to an automatic cutting device for processing circular air ducts. Background Art

[0002] Fire duct is a piping system used for air transportation and distribution. Fire duct can be divided into circular duct, rectangular duct and oblate duct according to the cross section. Among them, the circular duct has the advantages of small resistance, high air tightness and easy installation.

[0003] In the prior art, patent number CN214924880U discloses a simple cutting device for air duct processing, which sets a fixing device. When using the equipment, one end of the material is sleeved in the fixing plate, and the connecting rod in the middle of the fixing block is rotated to drive the adjusting gear to rotate, and the adjusting gear drives the adjusting rack to slide, so that the fixing plate squeezes the material to both sides, and when the material is fixed, the connecting rod is pushed toward the fixing block... Thereby solving the problem that the operator directly presses the air duct by hand to perform the cutting operation, and the operator's hands are easily burned by heat during the cutting process, so that the operator cannot press the air duct, resulting in the deformation of the cut air duct and affecting the normal use of the air duct. The technical solution of the above patent has the following shortcomings: 1. It requires manual operation to push the air duct for cutting, which is time-consuming and laborious; 2. There is a lack of air duct cutting positioning structure, which affects the neatness of the cut section of the air duct and the cutting effect is poor; 3. It is not convenient to quickly collect the cut air duct. Summary of the invention

[0004] The present invention provides an automatic cutting device for circular air duct processing, which is used to solve the technical problems raised in the background technology.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An automated cutting device for circular duct processing comprises a chassis, a circular duct and a laser cutter body, a support seat is provided on the left side of the chassis, a limit assembly is provided on the upper end of the support seat, a rectangular annular frame is fixedly penetrated on the left inner wall of the chassis, a guide mechanism is provided in the rectangular annular frame, the circular duct penetrates the rectangular annular frame and is in contact with the limit assembly and the guide mechanism, a pushing mechanism and a positioning mechanism are provided on the right inner wall of the chassis, the pushing mechanism is arranged opposite to the rectangular annular frame, and both the pushing mechanism and the positioning mechanism are in contact with the circular duct, an adjusting mechanism is provided on the top surface of the chassis, the laser cutter body is arranged on the adjusting mechanism, and a collecting mechanism is provided on the inner wall of the chassis below the circular duct.

[0007] Preferably, the limiting assembly includes a plurality of brackets fixedly connected to the upper ends of the front and rear sides of the support seat, the plurality of brackets are arranged opposite to each other in pairs, and the same limiting roller is rotatably connected between two of the relatively brackets, and the plurality of limiting rollers are in contact with the annular side wall of the circular air duct.

[0008] Preferably, the guide mechanism includes a number of guide rollers which are respectively arranged to horizontally rotate and penetrate the inner walls on the front and rear sides of the rectangular annular frame, and a number of first servo motors which are fixedly installed on the front end side wall of the rectangular annular frame. The guide rollers are respectively arranged close to the top and bottom of the rectangular annular frame, and the guide rollers on the same horizontal plane are evenly spaced. The annular side walls of the guide rollers are each provided with a number of evenly distributed strip-shaped wear-resistant protrusions. The annular side walls of the circular air duct located in the rectangular annular frame are in contact with the number of strip-shaped wear-resistant protrusions. The driving shafts of the first servo motors are respectively fixedly connected to the front end roller shafts of the guide rollers located above, and the rear end roller shafts of the guide rollers are coaxially fixedly connected with a transmission wheel, and the two upper and lower relative transmission wheels are connected by a pulley transmission.

[0009] Preferably, the strip-shaped wear-resistant protrusion and the guide roller are integrally formed.

[0010] Preferably, the pushing mechanism includes a first hydraulic cylinder fixedly mounted on the right end side wall of the chassis and a rectangular block fixedly connected to the right inner wall of the chassis, the rectangular block is arranged opposite to the rectangular annular frame, a circular slot is provided on the side wall of the rectangular block opposite to the rectangular annular frame, the circular air duct is inserted in the circular slot, the piston rod of the first hydraulic cylinder horizontally penetrates the right inner wall of the chassis and the inner wall of the circular slot located at the center position, one end of the piston rod of the first hydraulic cylinder located in the circular slot is fixedly connected to a buffer pushing block, and the circular air duct is in contact with the buffer pushing block.

[0011] Preferably, the positioning mechanism includes two mounting seats fixedly connected to the right inner wall of the chassis, the two mounting seats are respectively located at the upper and lower sides of the rectangular block, and a second hydraulic cylinder is fixedly installed on the two mounting seats, the piston rods of the two second hydraulic cylinders are relatively arranged, and the free ends of the piston rods of the two second hydraulic cylinders are respectively provided with U-shaped seats, and the openings of the two U-shaped seats are relatively arranged, and positioning rollers are fixedly installed in the openings of the two U-shaped seats, and the two positioning rollers are in contact with the annular side walls of the circular air duct, and circular grooves are provided on the side walls of the two U-shaped seats away from the positioning rollers, and the two circular grooves are respectively arranged opposite to the piston rods of the two second hydraulic cylinders, and hydraulic buffers are fixedly installed on the inner walls of the two circular grooves, and the piston rods of the two second hydraulic cylinders are respectively inserted into the two circular grooves and fixedly connected to the hydraulic buffers.

[0012] Preferably, the adjusting mechanism comprises a support platform fixedly connected to the top surface of the circular air duct facing the chassis and a second servo motor fixedly installed on the side wall of the right end of the chassis, a chamber is provided in the support platform, a connecting rod is fixedly connected to the driving shaft of the second servo motor, the connecting rod horizontally rotates, penetrates the right inner wall of the chassis and extends into the chamber, one end of the connecting rod located in the chamber is fixedly connected to a screw rod, and the end of the screw rod away from the connecting rod is horizontally rotatably connected to the inner wall of the other side of the chamber, a shift block is threadedly sleeved on the screw rod, a strip opening is provided on the bottom of the chamber, the front and rear inner walls of the strip opening are seamlessly connected to the front and rear inner walls of the chamber respectively, the side walls of the shift block are slidably in contact with the inner walls of the chamber and the strip opening, a linear slide rail is fixedly installed at the lower end of the shift block, a movable guide block matching it is slidably connected to the linear slide rail, and the laser cutter body is fixedly installed at the lower end of the movable guide block.

[0013] Preferably, the material collecting mechanism includes an arc-shaped guide plate fixedly connected to the front and rear inner walls of the chassis, the arc-shaped guide plate is located directly below the circular air duct, the left and right side walls of the arc-shaped guide plate are seamlessly connected to the left and right side walls of the chassis respectively, a rectangular opening is provided on the arc-shaped guide plate, and a discharge port is provided on the right inner wall of the bottom of the chassis, and an uncovered material collecting trough with a pulley and a handle is inserted in the discharge port.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The circular air duct is mounted on a limiting roller and penetrates a rectangular ring frame. A plurality of guide rollers cooperate with strip-shaped wear-resistant protrusions to shift and push the circular air duct, replacing manual operation for pushing and cutting, saving time and effort and reducing safety hazards.

[0016] 2. The circular air duct is introduced into the chassis through the guide mechanism and the limit assembly, and is inserted into the circular slot to contact the buffer push block, so that the second hydraulic cylinder drives the positioning roller to cooperate with the hydraulic buffer to clamp and position the circular air duct, avoiding affecting the neatness of the cut end face of the circular air duct and improving the cutting effect.

[0017] 3. The adjustment mechanism drives the laser cutter body to shift and cut the positioned circular air duct, and the first hydraulic cylinder cooperates with the buffer push block to push the cut circular air duct out of the circular slot, and the arc guide plate guides the cut circular air duct into the uncovered collecting trough through the rectangular opening, so as to quickly collect the cut air duct and improve the cutting efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a front perspective schematic diagram of an automatic cutting device for circular air duct processing proposed by the present invention;

[0019] Figure 2 This is a side structural schematic diagram of an automatic cutting device for circular air duct processing proposed by the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of a limiting component of an automatic cutting device for circular air duct processing proposed by the present invention;

[0021] Figure 4 for Figure 1 A partial enlarged view of the middle A;

[0022] Figure 5 This is a schematic diagram of the structure of a guide mechanism of an automatic cutting device for circular air duct processing proposed by the present invention;

[0023] Figure 6 for Figure 1 A partial enlarged view of point B in the middle;

[0024] Figure 7 This is a schematic structural diagram of a rectangular block and a buffer push block of an automatic cutting device for circular air duct processing proposed by the present invention;

[0025] Figure 8 This is a schematic diagram of a partially disassembled structure of a positioning mechanism of an automatic cutting device for circular air duct processing proposed by the present invention;

[0026] Fig. 9 for Figure 1 A partial enlarged view of point C in the middle;

[0027] Fig.10 This is a schematic structural diagram of an arc-shaped guide plate of an automatic cutting device for circular air duct processing proposed by the present invention.

[0028] In the figure: 1 chassis, 2 circular air duct, 3 laser cutter body, 4 support seat, 5 rectangular ring frame, 6 bracket, 7 limit roller, 8 guide roller, 9 first servo motor, 10 strip wear-resistant protrusion, 11 transmission wheel, 12 first hydraulic cylinder, 13 rectangular block, 14 circular slot, 15 buffer push block, 16 mounting seat, 17 second hydraulic cylinder, 18 U-type seat, 19 positioning roller, 20 circular slot, 21 hydraulic buffer, 22 support table, 23 second servo motor, 24 chamber, 25 connecting rod, 26 screw rod, 27 shift block, 28 strip opening, 29 linear slide rail, 30 arc guide plate, 31 rectangular opening, 32 discharge port, 33 uncovered aggregate trough. DETAILED DESCRIPTION

[0029] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] Reference Figure 1-10 As shown, an automatic cutting device for circular duct processing includes a chassis 1, a circular duct 2 and a laser cutter body 3. The front end side wall of the chassis 1 is set as a detachable transparent panel, which is convenient for observing and repairing the components inside the chassis 1. The laser cutter body 3 is used to cut the circular duct 2. The laser cutter body 3 is a prior art and is not described in detail here. A support seat 4 is provided on the left side of the chassis 1. A limit assembly is provided on the upper end of the support seat 4. The limit assembly includes a plurality of brackets 6 fixedly connected to the support seat 4 at the upper ends of the front and rear sides. The plurality of brackets 6 are arranged opposite to each other in pairs, and the same limit roller 7 is rotatably connected between two opposite brackets 6. The bracket 6 is used to support the limit roller 7. The plurality of limit rollers 7 are all in contact with the annular side wall of the circular duct 2. The plurality of limit rollers 7 are used to increase the limit support for the circular duct 2 located outside the chassis 1, so that the circular duct 2 can be smoothly introduced into the chassis 1 along the guide mechanism. A rectangular annular frame 5 is fixedly penetrated on the left inner wall of the chassis 1.

[0032] A guide mechanism is provided in the rectangular annular frame 5, and the circular air duct 2 is arranged through the rectangular annular frame 5 and is in contact with the limit assembly and the guide mechanism. The guide mechanism includes a plurality of guide rollers 8 which are respectively arranged through the inner walls of the front and rear sides of the rectangular annular frame 5 and are respectively rotated horizontally and are fixedly installed on the front end side wall of the rectangular annular frame 5. The plurality of first servo motors 9 are used to drive the plurality of upper guide rollers 8 to rotate simultaneously. The model of the first servo motor 9 is: MSME-022G1. The plurality of guide rollers 8 are respectively arranged near the top and bottom of the rectangular annular frame 5. The plurality of guide rollers 8 on the same horizontal plane are arranged at equal intervals. The annular side walls of the plurality of guide rollers 8 are provided with a plurality of evenly distributed strip-shaped wear-resistant protrusions 10. The plurality of guide rollers 8 simultaneously rotate in the same direction to cooperate with the strip-shaped wear-resistant protrusions 10 to drive the circular air duct 2 in the rectangular annular frame 5 to move. The circular air duct 2 is guided into the chassis 1 instead of being manually pushed for cutting, which saves time and effort and reduces safety hazards. The annular side walls of the circular air duct 2 located in the rectangular annular frame 5 are in contact with a plurality of strip-shaped wear-resistant protrusions 10, and the driving shafts of the first servo motors 9 are respectively fixedly connected to the front end roller shafts of the plurality of guide rollers 8 located above, and the rear end roller shafts of the plurality of guide rollers 8 are coaxially fixedly connected with a transmission wheel 11. The rotation of the plurality of guide rollers 8 above drives the coaxially connected transmission wheel 11 to rotate, thereby making the transmission wheels 11 connected by the belt drive rotate in the same direction at the same time, and driving the plurality of guide rollers 8 below to rotate in the same direction at the same time, and the two upper and lower relative transmission wheels 11 are connected by pulley transmission, and the strip-shaped wear-resistant protrusion 10 and the guide roller 8 are integrated into an integrated strip-shaped wear-resistant protrusion 10 and the guide roller 8 for easy processing.

[0033] A pushing mechanism and a positioning mechanism are provided on the right inner wall of the chassis 1. The pushing mechanism is arranged opposite to the rectangular ring frame 5. The pushing mechanism includes a first hydraulic cylinder 12 fixedly mounted on the right end side wall of the chassis 1 and a rectangular block 13 fixedly connected to the right inner wall of the chassis 1. The model of the first hydraulic cylinder 12 is: HOB30*60. The first hydraulic cylinder 12 is used to drive the buffer push block 15 to move horizontally along the circular slot 14 until the cut circular air duct 2 in the circular slot 14 can be pushed out. The rectangular block 13 is arranged opposite to the rectangular ring frame 5. A circular slot 14 is provided on the side wall of the block 13 facing the rectangular annular frame 5, and the circular air duct 2 is inserted in the circular slot 14. The piston rod of the first hydraulic cylinder 12 horizontally penetrates the right inner wall of the chassis 1 and the inner wall of the circular slot 14 located at the center position. A buffer push block 15 is fixedly connected to one end of the piston rod of the first hydraulic cylinder 12 located in the circular slot 14, and the circular air duct 2 is in contact with the buffer push block 15. The buffer push block 15 can limit the circular air duct 2 in the circular slot 14 and provide a certain buffer protection for the circular air duct 2 when cutting.

[0034] The pushing mechanism and the positioning mechanism are both in contact with the circular air duct 2. The positioning mechanism includes two mounting seats 16 fixedly connected to the right inner wall of the chassis 1. The mounting seats 16 are used for installing and fixing the second hydraulic cylinder 17. The two mounting seats 16 are respectively arranged on the upper and lower sides of the rectangular block 13. The second hydraulic cylinder 17 is fixedly installed on the two mounting seats 16. The model of the second hydraulic cylinder 17 is: HOB60*120. The second hydraulic cylinder 17 is used to drive the positioning roller 19 on the U-shaped seat 18 to contact the annular side wall of the circular air duct 2, so that the U-shaped seat 18 compresses the hydraulic buffer 21 in the circular groove 20, and then the positioning roller 19 cooperates with the hydraulic buffer 21 to clamp and position the circular air duct 2, so as to avoid affecting the neatness of the cut end face of the circular air duct 2 and improve the cutting effect. The piston rods of the two second hydraulic cylinders 17 are arranged relatively, and the two A U-shaped seat 18 is provided at the free end of the piston rod of each second hydraulic cylinder 17, and the openings of the two U-shaped seats 18 are arranged opposite to each other. Positioning rollers 19 are fixedly installed in the openings of the two U-shaped seats 18, and the two positioning rollers 19 are in contact with the annular side walls of the circular air duct 2. Circular grooves 20 are provided on the side walls of the two U-shaped seats 18 away from the positioning rollers 19. The two circular grooves 20 are respectively arranged opposite to the piston rods of the two second hydraulic cylinders 17. Hydraulic buffers 21 are fixedly installed on the inner walls of the two circular grooves 20. The model of the hydraulic buffer 21 is: HYD2-80. On the one hand, the hydraulic buffer 21 cooperates with the positioning rollers 19 to clamp and position the circular air duct 2, and on the other hand, it can provide buffering for the circular air duct 2 when cutting. The piston rods of the two second hydraulic cylinders 17 are respectively inserted into the two circular grooves 20 and fixedly connected to the hydraulic buffer 21.

[0035] An adjusting mechanism is provided on the top surface of the chassis 1, and the laser cutter body 3 is arranged on the adjusting mechanism. The adjusting mechanism includes a support platform 22 fixedly connected to the top surface of the chassis 1 facing the circular air duct 2 and a second servo motor 23 fixedly installed on the right end side wall of the chassis 1. The model of the second servo motor 23 is: MSME-042G1. The second servo motor 23 is used to drive the connecting rod 25 and the screw rod 26 to rotate. A chamber 24 is provided in the support platform 22. A connecting rod 25 is fixedly connected to the driving shaft of the second servo motor 23. The connecting rod 25 rotates horizontally and penetrates the right inner wall of the chassis 1 and extends into the chamber 24. One end of the connecting rod 25 located in the chamber 24 is fixedly connected to the screw rod 26, and the end of the screw rod 26 away from the connecting rod 25 is horizontally connected to the inner wall of the other side of the chamber 24. A displacement block 27 is threadedly sleeved on the screw rod 26. A strip opening 28 is provided on the bottom, and the front and rear inner walls of the strip opening 28 are seamlessly connected to the front and rear inner walls of the chamber 24 respectively. The screw rod 26 rotates to drive the shift block 27 to move back and forth horizontally under the limiting action of the strip opening 28, and the shift block 27 cooperates with the linear slide rail 29 to drive the laser cutter body 3 to move back and forth horizontally to adjust the cutting position of the circular air duct 2. The side walls of the shift block 27 slide against the inner walls of the chamber 24 and the strip opening 28. A linear slide rail 29 is fixedly installed at the lower end of the shift block 27, and a movable guide block (not shown in the figure) matching it is slidably connected to the linear slide rail 29. The laser cutter body 3 is fixedly installed at the lower end of the movable guide block (not shown in the figure). The model of the linear slide rail 29 is: SKR14. The linear slide rail 29 cooperates with the movable guide block (not shown in the figure) to drive the laser cutter body 3 to perform shift cutting.

[0036] A material collecting mechanism is provided on the inner wall of the chassis 1 below the circular air duct 2, and the material collecting mechanism includes an arc-shaped guide plate 30 fixedly connected to the inner walls on the front and rear sides of the chassis 1. The arc-shaped guide plate 30 can guide the cut circular air duct 2 to the rectangular opening 31 and fall into the uncovered material collecting trough 33, which is convenient for quickly collecting the cut air duct and improving the cutting efficiency. The arc-shaped guide plate 30 is located directly below the circular air duct 2, and the left and right side walls of the arc-shaped guide plate 30 are seamlessly connected to the left and right side walls of the chassis 1 respectively. A rectangular opening 31 is provided on the arc-shaped guide plate 30, and a discharge port 32 is provided on the right inner wall of the chassis 1 at the bottom. A uncovered material collecting trough 33 with a pulley and a handle is inserted in the discharge port 32. The uncovered material collecting trough 33 with a pulley and a handle is used to collect the cut circular air duct 2, and the pulley and the handle facilitate the operation of the uncovered material collecting trough 33 to move.

[0037] When the present invention is actually used, the circular air duct 2 is manually lifted between the several brackets 6 and abutted against the several limiting rollers 7, so as to push the circular air duct 2 to be inserted into the rectangular ring frame 5, and the several first servo motors 9 are started to drive the several guide rollers 8 above to rotate simultaneously, so that the rotation of the several guide rollers 8 above drives the coaxially connected transmission wheel 11 to rotate, and then the transmission wheels 11 connected by several belt drives rotate in the same direction at the same time, and drive the several guide rollers 8 below to rotate in the same direction at the same time, so that the several guide rollers 8 drive the circular air duct 2 in the rectangular ring frame 5 to shift and guide it into the chassis 1, until the circular air duct 2 is inserted into the circular slot 14 on the rectangular block 13 and abutted against the buffer push block 15, instead of manual operation for pushing and cutting, which saves time and effort and reduces safety hazards.

[0038] The second hydraulic cylinder 17 on the two mounting seats 16 is started, so that the second hydraulic cylinder 17 drives the positioning roller 19 on the U-shaped seat 18 to contact the annular side wall of the circular air duct 2, and the positioning roller 19 drives the U-shaped seat 18 to compress the hydraulic buffer 21 in the circular groove 20, so that the positioning roller 19 cooperates with the hydraulic buffer 21 to clamp and position the circular air duct 2, so as to avoid affecting the neatness of the cut end surface of the circular air duct 2 and improve the cutting effect. The second servo motor 23 is started to drive the connecting rod 25 and the screw rod 26 to rotate, so that the screw rod 26 drives the displacement block 27 to be horizontally moved under the limiting action of the strip opening 28. The laser cutter body 3 moves back and forth horizontally, and the shift block 27 cooperates with the linear slide rail 29 to drive the laser cutter body 3 to move back and forth horizontally, adjust the cutting position of the circular air duct 2, and the linear slide rail 29 drives the laser cutter body 3 to shift and cut the circular air duct 2. When the cutting of the circular air duct 2 is completed, the first servo motors 9 are started again to drive the circular air duct 2 to shrink into the rectangular ring frame 5, and the first hydraulic cylinder 12 is started to drive the buffer push block 15 to push the cut circular air duct 2 onto the arc guide plate 30, and drop it along the rectangular opening 31 into the uncovered collecting trough 33, which is convenient for quickly collecting the cut air duct and improving the cutting efficiency.

[0039] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An automatic cutting device for circular air duct processing, comprising a chassis (1), a circular air duct (2) and a laser cutter body (3), wherein a support seat (4) is provided on the left side of the chassis (1), characterized in that: A limiting assembly is provided at the upper end of the support seat (4); a rectangular annular frame (5) is fixedly provided on the left inner wall of the chassis (1) and penetrates therethrough; a guiding mechanism is provided inside the rectangular annular frame (5); the circular air duct (2) penetrates the rectangular annular frame (5) and contacts the limiting assembly and the guiding mechanism; a material pushing mechanism and a positioning mechanism are provided on the right inner wall of the chassis (1); the material pushing mechanism is arranged opposite to the rectangular annular frame (5); the material pushing mechanism and the positioning mechanism both contact the circular air duct (2); an adjusting mechanism is provided on the top surface of the chassis (1); the laser cutter body (3) is arranged on the adjusting mechanism; and a material collecting mechanism is provided on the inner wall of the chassis (1) below the circular air duct (2).

2. The automatic cutting device for circular air duct processing according to claim 1, characterized in that: The limiting assembly comprises a plurality of brackets (6) fixedly connected to the support seat (4) and located at the upper ends of the front and rear sides. The plurality of brackets (6) are arranged opposite to each other in pairs, and a same limiting roller (7) is rotatably connected between two of the relatively opposite brackets (6). The plurality of limiting rollers (7) are all in contact with the annular side wall of the circular air duct (2).

3. The automatic cutting device for circular air duct processing according to claim 1, characterized in that: The guide mechanism comprises a plurality of guide rollers (8) which are respectively arranged to rotate horizontally and penetrate the inner walls of the front and rear sides of the rectangular annular frame (5) and a plurality of first servo motors (9) which are fixedly mounted on the front end side wall of the rectangular annular frame (5). The plurality of guide rollers (8) are respectively arranged close to the top surface and the bottom surface of the rectangular annular frame (5). The plurality of guide rollers (8) on the same horizontal plane are arranged at equal intervals. The annular side walls of the plurality of guide rollers (8) are each provided with a plurality of uniformly distributed strip-shaped wear-resistant protrusions (10). The annular side walls of the circular air duct (2) located in the rectangular annular frame (5) are each in contact with the plurality of strip-shaped wear-resistant protrusions (10). The driving shafts of the plurality of first servo motors (9) are respectively fixedly connected to the front end roller shafts of the plurality of guide rollers (8) located above. The rear end roller shafts of the plurality of guide rollers (8) are coaxially fixedly connected with a transmission wheel (11). The two upper and lower relative transmission wheels (11) are both connected by a pulley transmission.

4. The automatic cutting device for circular air duct processing according to claim 3 is characterized in that: The strip-shaped wear-resistant protrusion (10) and the guide roller (8) are integrally formed.

5. The automatic cutting device for circular air duct processing according to claim 1, characterized in that: The pushing mechanism comprises a first hydraulic cylinder (12) fixedly mounted on the right end side wall of the chassis (1) and a rectangular block (13) fixedly connected to the right inner wall of the chassis (1); the rectangular block (13) is arranged opposite to the rectangular annular frame (5); a circular slot (14) is arranged on the side wall of the rectangular block (13) opposite to the rectangular annular frame (5); the circular air duct (2) is inserted into the circular slot (14); the piston rod of the first hydraulic cylinder (12) horizontally penetrates the right inner wall of the chassis (1) and the inner wall of the circular slot (14) at the center position; one end of the piston rod of the first hydraulic cylinder (12) located in the circular slot (14) is fixedly connected to a buffer pushing block (15); the circular air duct (2) is in contact with the buffer pushing block (15).

6. The automatic cutting device for circular air duct processing according to claim 1, characterized in that: The positioning mechanism comprises two mounting seats (16) fixedly connected to the right inner wall of the chassis (1), the two mounting seats (16) being respectively arranged at the upper and lower sides of the rectangular block (13), the two mounting seats (16) being fixedly mounted with a second hydraulic cylinder (17), the piston rods of the two second hydraulic cylinders (17) being arranged opposite to each other, the free ends of the piston rods of the two second hydraulic cylinders (17) being provided with a U-shaped seat (18), the openings of the two U-shaped seats (18) being arranged opposite to each other, and the openings of the two U-shaped seats (18) being fixedly mounted with a A positioning roller (19), wherein the two positioning rollers (19) are both in contact with the annular side wall of the circular air duct (2), and a circular groove (20) is provided on the side wall of the two U-shaped seats (18) away from the positioning roller (19), and the two circular grooves (20) are respectively arranged opposite to the piston rods of the two second hydraulic cylinders (17), and a hydraulic buffer (21) is fixedly installed on the inner wall of the two circular grooves (20), and the piston rods of the two second hydraulic cylinders (17) are respectively inserted into the two circular grooves (20) and fixedly connected to the hydraulic buffer (21).

7. The automatic cutting device for circular air duct processing according to claim 1, characterized in that: The regulating mechanism comprises a support platform (22) respectively fixedly connected to the top surface of the chassis (1) facing the circular air duct (2) and a second servo motor (23) fixedly installed on the right side wall of the chassis (1); a chamber (24) is provided in the support platform (22); a connecting rod (25) is fixedly connected to the driving shaft of the second servo motor (23); the connecting rod (25) is horizontally rotated to penetrate the right inner wall of the chassis (1) and extend into the chamber (24); one end of the connecting rod (25) located in the chamber (24) is fixedly connected to a screw rod (26); the end of the screw rod (26) away from the connecting rod (25) is connected to the chamber (24) The inner wall of the other side of the chamber (24) is horizontally rotatably connected, a displacement block (27) is threadedly sleeved on the screw rod (26), a strip opening (28) is provided on the bottom of the chamber (24), and the inner walls on the front and rear sides of the strip opening (28) are seamlessly connected to the inner walls on the front and rear sides of the chamber (24), respectively, and the side walls of the displacement block (27) are slidably abutted against the inner walls of the chamber (24) and the strip opening (28), and a linear slide rail (29) is fixedly installed at the lower end of the displacement block (27), and a movable guide block matching the linear slide rail (29) is slidably connected thereto, and the laser cutter body (3) is fixedly installed at the lower end of the movable guide block.

8. The automatic cutting device for circular air duct processing according to claim 1, characterized in that: The material collecting mechanism comprises an arc-shaped guide plate (30) fixedly connected to the inner walls of the front and rear sides of the chassis (1); the arc-shaped guide plate (30) is located directly below the circular air duct (2); the left and right side walls of the arc-shaped guide plate (30) are seamlessly connected to the left and right side walls of the chassis (1) respectively; a rectangular opening (31) is provided on the arc-shaped guide plate (30); a material discharging port (32) is provided on the right inner wall at the bottom of the chassis (1); and an uncovered material collecting trough (33) with a pulley and a handle is inserted into the material discharging port (32).

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