Cross-country motorcycle frame steel pipe cutting device and machining method thereof

Abstract

The invention discloses a cross-country motorcycle frame steel pipe cutting device and a machining method thereof, and relates to the field of cross-country motorcycle frame manufacturing. The cross-country motorcycle frame steel pipe cutting device comprises a steel pipe cutting mounting table, a steel pipe cutting assembly is arranged on one side of the steel pipe cutting mounting table, and a steel pipe clamping assembly is arranged on one side of the steel pipe cutting assembly; the automatic length fixing assembly is arranged on one side of the steel pipe clamping assembly, the length fixing limiting assembly is arranged on one side of the automatic length fixing assembly, the impurity treatment assembly is arranged below the steel pipe cutting mounting table, and through the steel pipe cutting assembly and the contact type length fixing system, precise arc cutting of a steel pipe is completed through one-time clamping, direct welding can be achieved, and milling machine machining is replaced; the problems that secondary clamping is needed during milling of the arc-shaped end face, the accumulated time consumption accounts for more than 40% of the whole machining period (taking a chromium-molybdenum steel pipe with the diameter being 60 * 4 mm as an example, the time consumption of single-piece milling is larger than or equal to 15 minutes), the positioning reference is lost due to repeated sequence turning, the perpendicularity error of the arc-shaped end face and the axis of a pipe body often exceeds + / -1.5 degrees, and manual grinding is needed during welding are solved.

Description

Technical Field

[0001] This invention relates to the field of off-road motorcycle frame manufacturing, and more specifically, to an off-road motorcycle frame steel tube cutting device and its processing method. Background Technology

[0002] The frame of an off-road motorcycle is the core load-bearing structure of the entire vehicle. It is a space truss structure welded from high-strength steel tubes (commonly chromium-molybdenum alloy steel such as 4130). It directly bears the load of all components such as the engine, suspension, and body panels. In the field of off-road motorcycle frame manufacturing, the traditional processing of steel tube curved structures (such as main beam bends and rear swingarm connecting tubes) requires three stages: "cutting-bending-milling". First, straight tube blanks are cut, then shaped by a tube bending machine, and finally the curved end face is machined by a milling machine to ensure welding fit accuracy.

[0003] The process has significant drawbacks: milling the arc-shaped end face requires secondary clamping, which takes up more than 40% of the overall processing time (taking a φ60×4mm chromium-molybdenum steel pipe as an example, the milling time for a single piece is ≥15 minutes). Multiple sequence changes lead to the loss of positioning reference, and the perpendicularity error between the arc-shaped end face and the pipe axis often exceeds ±1.5°. Manual grinding is required during welding. Summary of the Invention

[0004] In view of the problems in the related technologies, the present invention proposes a cutting device and processing method for steel pipes of off-road motorcycle frames to overcome the above-mentioned technical problems existing in the existing related technologies.

[0005] Therefore, the specific technical solution adopted by the present invention is as follows: A steel pipe cutting device for off-road motorcycle frame includes a steel pipe cutting mounting table, a steel pipe cutting component on one side of the steel pipe cutting mounting table, a steel pipe clamping component on one side of the steel pipe cutting component, an automatic length fixing component on one side of the steel pipe clamping component, a length fixing limit component on one side of the automatic length fixing component, and an impurity treatment component below the steel pipe cutting mounting table. To achieve the function of cutting steel pipes, the steel pipe cutting assembly includes a cutting mounting frame, which is connected to the steel pipe cutting mounting table. An intermediate shaft is movably connected to the middle of the cutting mounting frame, and a transmission worm gear is connected to the periphery of the intermediate shaft. A transmission worm is meshed on one side of the transmission worm gear, and a worm fixing plate is movably connected to the periphery of the transmission worm. The worm fixing plate is connected to the cutting mounting frame. A servo motor is connected to one end of the transmission worm, and the housing of the servo motor is connected to the worm fixing plate. An angle sensor is connected to one end of the intermediate shaft, and a sensor fixing frame is connected to the periphery of the angle sensor. The sensor fixing frame is connected to the cutting mounting frame.

[0006] Furthermore, the steel pipe cutting assembly also includes a cutting mounting plate, which is connected to the end of the intermediate shaft furthest from the angle sensor. A sliding shaft is installed inside the cutting mounting plate, and a movable slider is slidably fitted around the sliding shaft. A hydraulically controlled push rod is connected around the movable slider, and the hydraulically controlled push rod is connected to the cutting mounting plate. A cutting motor is installed inside the movable slider, and a cutting column is connected to the output end of the cutting motor. A circular cutting blade is connected to one side of the cutting column.

[0007] Furthermore, in order to achieve the function of clamping the steel pipe, the steel pipe clamping assembly includes an arc-shaped sliding plate, which is installed above the steel pipe cutting mounting table. A steel pipe movable mounting frame is provided on one side of the arc-shaped sliding plate. A movable electric push rod is installed inside the steel pipe movable mounting frame. One end of the movable electric push rod is connected to a pushing movable plate. A clamping mounting plate is symmetrically connected above the steel pipe cutting mounting table. A clamping hydraulic rod is installed inside the clamping mounting plate. The output end of the clamping hydraulic rod is connected to a clamping arc plate.

[0008] Furthermore, a controller is installed on one side of the steel pipe cutting mounting table. The servo motor, angle sensor, hydraulic electric actuator, cutting motor, moving electric actuator, and clamping hydraulic rod are electrically connected to the controller.

[0009] Furthermore, in order to achieve the function of automatic length setting, the automatic length setting component includes a length setting adjustment mounting bracket, which is connected to the steel pipe cutting mounting table. An adjustment threaded shaft is movably connected inside the length setting adjustment mounting bracket, and an adjustment slider is threadedly fitted around the adjustment threaded shaft. A trigger plate is connected above the adjustment slider, and a contact switch is installed on one side of the trigger plate. A drive motor is connected to one end of the adjustment threaded shaft, and the contact switch and drive motor are electrically connected to the controller.

[0010] Furthermore, in order to achieve the function of fixed length limit, the fixed length limit component includes a limit mounting bracket, which is installed on one side of the fixed length adjustment mounting bracket. A limit hydraulic rod is installed inside the limit mounting bracket. The output end of the limit hydraulic rod is connected to a limit arc plate. An arc plate limit rubber layer is installed inside the limit arc plate. The limit hydraulic rod is electrically connected to the controller.

[0011] Furthermore, the steel pipe cutting and installation platform has an impurity drop groove inside, and a support frame is connected below the steel pipe cutting and installation platform.

[0012] Furthermore, in order to achieve the purpose of impurity treatment, the impurity treatment component includes an impurity collection hopper, which is connected to the steel pipe cutting and mounting platform. An impurity collection box is connected to the bottom of the impurity collection hopper, and an impurity cleaning door is installed on one side of the impurity collection box.

[0013] Furthermore, a pull handle is connected to one side of the impurity cleaning door, and a glove sleeve is installed around the pull handle.

[0014] According to another aspect of the present invention, a method for processing a cutting device for off-road motorcycle frame steel tubes is provided, comprising the following steps: S1: Equipment Preparation and Parameter Setting After confirming that the support frame of the steel pipe cutting installation table is stable and the impurity collection box has been emptied, the cutting length is input through the controller, the drive motor is started to drive the adjusting threaded shaft to rotate, which in turn moves the adjusting slider and trigger plate to the target position. The cutting angle is set, and the servo motor drives the intermediate shaft to rotate through the transmission worm gear and the transmission worm wheel. The angle sensor feeds back the data to the controller in real time.

[0015] S2: Steel pipe feeding and positioning locking Place the steel pipe to be cut on the arc-shaped sliding plate, start the moving electric actuator, push the moving plate to make the steel pipe slide along the arc-shaped sliding plate until the end contacts the limiting arc plate's limiting rubber layer. The steel pipe presses against the trigger plate to trigger the contact switch, and the controller starts immediately. The clamping hydraulic rod pushes the clamping arc plate to radially clamp the steel pipe, and the limiting hydraulic rod pressurizes and fixes the end of the steel pipe.

[0016] S3: Multi-axis collaborative cutting execution The cutting motor drives the circular cutting blade to rotate at high speed, and the servo motor precisely rotates the intermediate shaft, moving the cutting mounting plate to a preset angle (adjustable from 0° to 90°). The hydraulic electric control push rod pushes the moving slider to move along the sliding shaft, so that the rotating circular cutting blade contacts the surface of the steel pipe. The circular cutting blade cuts into the steel pipe at a uniform speed until it is completely cut off, and the hydraulic electric control push rod automatically resets.

[0017] S4: Waste disposal and workpiece unloading Metal shavings generated during cutting fall into the impurity collection hopper through the impurity drop chute and eventually into the impurity collection box. The controller controls the clamping hydraulic rod and the limit hydraulic rod to retract synchronously, allowing the operator to remove the cut steel pipe section. Uncut steel pipes are automatically returned to their original position by the moving electric push rod and are ready for use.

[0018] The beneficial effects of this invention are as follows: (1) In practical use, the present invention enables precise arc cutting of steel pipes in one clamping by using steel pipe cutting components and contact length fixing system. The pipes can be directly welded, replacing milling machine processing. This solves the problems of needing to clamp the arc end face twice, accumulating more than 40% of the overall processing cycle (taking φ60×4mm chromium molybdenum steel pipe as an example, the single piece milling time is ≥15 minutes), multiple sequence changes leading to loss of positioning reference, and the perpendicularity error between the arc end face and the pipe axis often exceeding ±1.5°, requiring manual grinding during welding.

[0019] (2) By using the adjustable angle design of the steel pipe cutting component (servo motor drives the transmission worm gear to mesh with the transmission worm wheel, driving the intermediate shaft to rotate), combined with the precise triggering of the automatic length fixing component (adjusting the slider displacement to control the trigger plate to activate the contact switch), the arc end face can be cut and formed in one go, eliminating the need for secondary milling processing. The processing time for a single piece is reduced from 22 minutes to 6 minutes, and the efficiency is improved by 73%.

[0020] (3) The angle sensor monitors the rotation angle of the intermediate shaft in real time, and the controller controls the angle error ≤ ±0.3° in a closed loop; the limit arc plate of the fixed length limit component is embedded with the limit arc plate limit rubber layer and works in conjunction with the contact switch to ensure that the cutting length fluctuation is ≤ 0.15mm. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the main structure of a cross-country motorcycle frame steel pipe cutting device according to an embodiment of the present invention; Figure 2 This is one of the steel pipe cutting components in a motocross frame steel pipe cutting device according to an embodiment of the present invention; Figure 3 This is a second steel pipe cutting component in a cross-country motorcycle frame steel pipe cutting device according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the steel pipe clamping assembly in a cross-country motorcycle frame steel pipe cutting device according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the automatic length-fixing component in a cross-country motorcycle frame steel pipe cutting device according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the length limiting component in a cross-country motorcycle frame steel pipe cutting device according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the impurity treatment component in a cross-country motorcycle frame steel pipe cutting device according to an embodiment of the present invention; Figure 8 This is one of the block diagrams of a processing method for a steel pipe cutting device for a motocross frame according to an embodiment of the present invention; Figure 9 This is a second block diagram of a processing method for a cutting device for off-road motorcycle frame steel pipes according to an embodiment of the present invention.

[0023] In the picture: 1. Steel pipe cutting mounting table; 2. Steel pipe cutting assembly; 201. Cutting mounting frame; 202. Intermediate shaft; 203. Transmission worm gear; 204. Transmission worm; 205. Worm fixing plate; 206. Servo motor; 207. Angle sensor; 208. Sensor fixing frame; 209. Cutting mounting plate; 210. Sliding shaft; 211. Moving slider; 212. Hydraulic electric actuator; 213. Cutting motor; 214. Cutting column; 215. Circular cutting blade; 3. Steel pipe clamping assembly; 301. Arc-shaped sliding plate; 302. Steel pipe moving mounting frame; 303. Clamping arc plate; 304. Moving electric actuator; 305. Push... 306. Moving plate; 307. Clamping mounting plate; 308. Clamping hydraulic rod; 4. Automatic length fixing assembly; 401. Length fixing adjustment mounting bracket; 402. Adjusting threaded shaft; 403. Adjusting slider; 404. Trigger plate; 405. Contact switch; 406. Drive motor; 5. Length fixing limit assembly; 501. Limit mounting bracket; 502. Limiting hydraulic rod; 503. Limiting arc plate; 504. Arc plate limiting rubber layer; 6. Impurity handling assembly; 601. Impurity collection hopper; 602. Impurity collection box; 603. Impurity cleaning door; 7. Controller; 8. Impurity drop trough; 9. Support frame; 10. Pull handle; 11. Handle sleeve. Detailed Implementation

[0024] The technical solutions of 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 of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] According to an embodiment of the present invention, a steel pipe cutting device for off-road motorcycle frames is provided, including a steel pipe cutting mounting platform 1, a steel pipe cutting component 2 on one side of the steel pipe cutting mounting platform 1, a steel pipe clamping component 3 on one side of the steel pipe cutting component 2, an automatic length fixing component 4 on one side of the steel pipe clamping component 3, a length fixing limit component 5 on one side of the automatic length fixing component 4, and an impurity treatment component 6 below the steel pipe cutting mounting platform 1.

[0026] like Figure 1-3As shown, in the off-road motorcycle frame steel pipe cutting device according to an embodiment of the present invention, the steel pipe cutting assembly 2 includes a cutting mounting frame 201, which is connected to the steel pipe cutting mounting table 1. An intermediate shaft 202 is movably connected to the middle of the cutting mounting frame 201. A transmission worm gear 203 is connected to the periphery of the intermediate shaft 202. A transmission worm 204 meshes with one side of the transmission worm gear 203. A worm fixing plate 205 is movably connected to the periphery of the transmission worm 204. The worm fixing plate 205 is connected to the cutting mounting frame 201. A servo motor 206 is connected to one end of the transmission worm 204. The housing of the servo motor 206 is connected to the worm fixing plate 205. An angle sensor 207 is connected to one end of the intermediate shaft 202. The outer part is connected to a sensor mounting bracket 208, which is connected to a cutting mounting bracket 201. The steel pipe cutting assembly 2 also includes a cutting mounting plate 209, which is connected to the end of the intermediate shaft 202 away from the angle sensor 207. A sliding shaft 210 is installed inside the cutting mounting plate 209. A movable slider 211 is slidably fitted around the sliding shaft 210. A hydraulic electric control push rod 212 is connected around the movable slider 211. The hydraulic electric control push rod 212 is connected to the cutting mounting plate 209. A cutting motor 213 is installed inside the movable slider 211. A cutting column 214 is connected to the output end of the cutting motor 213. A circular cutting blade 215 is connected to one side of the cutting column 214.

[0027] Through the above technical solution, the core of the steel pipe cutting assembly 2 is the cutting mounting frame 201, which is connected to the transmission worm gear 203 and the transmission worm 204 via the intermediate shaft 202 for meshing transmission. The transmission worm gear 203 and the transmission worm 204 use high-precision worm gears, which are stable and self-locking after adjustment. The transmission worm 204 is driven by a servo motor 206 and fixed to the cutting mounting frame 201 via a worm fixing plate 205. An angle sensor 207 monitors the rotation angle of the intermediate shaft 202 via a sensor fixing frame 208. The cutting mounting plate 209 is fixed to the end of the intermediate shaft 202, and its internal sliding shaft 210 guides the sliding slider 211, with feed controlled by a hydraulically controlled push rod 212. Inside the slider, the cutting motor 213 drives the cutting column 214 to rotate the circular cutting blade 215 for cutting, facilitating arc-shaped cutting of the steel pipe, eliminating the need for subsequent milling.

[0028] like Figure 4As shown, in the off-road motorcycle frame steel pipe cutting device according to an embodiment of the present invention, the steel pipe clamping assembly 3 includes an arc-shaped sliding plate 301, which is installed above the steel pipe cutting mounting table 1. A steel pipe movable mounting frame 302 is provided on one side of the arc-shaped sliding plate 301. A movable electric push rod 304 is installed inside the steel pipe movable mounting frame 302. One end of the movable electric push rod 304 is connected to a pushing movable plate 305. A clamping mounting plate 306 is symmetrically connected above the steel pipe cutting mounting table 1. A clamping hydraulic rod 307 is installed inside the clamping mounting plate 306. The output end of the clamping hydraulic rod 307 is connected to a clamping arc plate 303. A controller 7 is installed on one side of the steel pipe cutting mounting table 1. A servo motor 206, an angle sensor 207, a hydraulic electric push rod 212, a cutting motor 213, a movable electric push rod 304, and a clamping hydraulic rod 307 are electrically connected to the controller 7.

[0029] With the above technical solution, the steel pipe is placed on the arc-shaped sliding plate 301, and the clamping hydraulic rod 307 pushes the clamping arc plate 303 to radially lock the steel pipe. Axial feed is achieved through the steel pipe moving mounting frame 302: its internal moving electric actuator 304 drives the moving plate 305 to push the steel pipe to slide. A controller 7 is installed on the side of the steel pipe cutting mounting table 1 to centrally control the servo motor 206, the hydraulic electric actuator 212, the cutting motor 213, the moving electric actuator 304, and the clamping hydraulic rod 307 to ensure coordinated action.

[0030] like Figure 5 As shown, in the off-road motorcycle frame steel pipe cutting device according to an embodiment of the present invention, the automatic length-fixing component 4 includes a length-fixing adjustment mounting frame 401, which is connected to the steel pipe cutting mounting table 1. An adjustment threaded shaft 402 is movably connected inside the length-fixing adjustment mounting frame 401, and an adjustment slider 403 is threadedly fitted around the adjustment threaded shaft 402. A trigger plate 404 is connected above the adjustment slider 403, and a contact switch 405 is installed on one side of the trigger plate 404. A drive motor 406 is connected to one end of the adjustment threaded shaft 402, and the contact switch 405 and the drive motor 406 are electrically connected to the controller 7.

[0031] Through the above technical solution, the automatic length-fixing component 4 includes a length-fixing adjustment mounting bracket 401 fixed to the steel pipe cutting mounting table 1. The drive motor 406 rotates the adjusting threaded shaft 402, driving the threaded adjusting slider 403 to move axially. The trigger plate 404 at the top of the slider and the contact switch 405 constitute a length-fixing triggering unit.

[0032] like Figure 6As shown, in the off-road motorcycle frame steel pipe cutting device according to an embodiment of the present invention, the length limiting component 5 includes a limiting mounting frame 501, which is installed on one side of the length adjusting mounting frame 401. A limiting hydraulic rod 502 is installed inside the limiting mounting frame 501. The output end of the limiting hydraulic rod 502 is connected to a limiting arc plate 503. An arc plate limiting rubber layer 504 is installed inside the limiting arc plate 503. The limiting hydraulic rod 502 is electrically connected to the controller 7.

[0033] Through the above technical solution, the length limiting component 5 is fixed to the side of the length limiting component by the limiting mounting bracket 501: the limiting hydraulic rod 502 pushes the limiting arc plate 503 to press the end of the steel pipe, and the inner arc plate limiting rubber layer 504 prevents damage to the steel pipe. The contact switch 405, the drive motor 406 and the limiting hydraulic rod 502 are all connected to the controller 7 to realize closed-loop control.

[0034] like Figure 7 As shown, in the off-road motorcycle frame steel pipe cutting device according to an embodiment of the present invention, the steel pipe cutting mounting platform 1 has an impurity drop groove 8 inside, and a support frame 9 is connected below the steel pipe cutting mounting platform 1. The impurity treatment component 6 includes an impurity collection hopper 601, which is connected to the steel pipe cutting mounting platform 1. An impurity collection box 602 is connected to the bottom of the impurity collection hopper 601. An impurity cleaning door 603 is installed on one side of the impurity collection box 602. A pull handle 10 is connected to one side of the impurity cleaning door 603, and a handle sleeve 11 is installed around the pull handle 10.

[0035] Through the above technical solution, the debris generated during cutting enters the impurity treatment component 6 through the impurity drop trough 8 on the surface of the mounting platform 1. The waste material is introduced into the impurity collection box 602 through the impurity collection hopper 601. The side of the collection box is provided with an impurity cleaning door 603 with a pull handle 10, which improves the operating comfort of the glove sleeve 11. The entire device is stably supported by the support frame 9 welded to the bottom of the mounting platform 1 to ensure cutting stability.

[0036] According to another aspect of the present invention, a method for processing a cutting device for off-road motorcycle frame steel tubes is also provided, such as... Figures 8-9 As shown, it includes the following steps: S1: Equipment Preparation and Parameter Setting After confirming that the support frame 9 of the steel pipe cutting installation table 1 is stable and the impurity collection box 602 is emptied, the cutting length is input through the controller 7, the drive motor 406 is started to drive the adjusting thread shaft 402 to rotate, which drives the adjusting slider 403 and the trigger plate 404 to move to the target position. The cutting angle is set, the servo motor 206 meshes with the transmission worm gear 203 through the transmission worm 204, and drives the intermediate shaft 202 to rotate. The angle sensor 207 feeds back data to the controller 7 in real time.

[0037] S2: Steel pipe feeding and positioning locking Place the steel pipe to be cut on the arc-shaped sliding plate 301, start the moving electric actuator 304, push the moving plate 305 to make the steel pipe slide along the arc-shaped sliding plate 301 until the end contacts the arc-shaped limiting rubber layer 504 of the limiting arc plate 503. The steel pipe presses the trigger plate 404 to trigger the contact switch 405. The controller 7 starts immediately, the clamping hydraulic rod 307 pushes the clamping arc plate 303 to radially clamp the steel pipe, and the limiting hydraulic rod 502 pressurizes and fixes the end of the steel pipe.

[0038] S3: Multi-axis collaborative cutting execution The cutting motor 213 drives the circular cutting blade 215 to rotate at high speed. The servo motor 206 precisely rotates the intermediate shaft 202, driving the cutting mounting plate 209 to a preset angle that is adjustable from 0° to 90°. The hydraulic electric control push rod 212 pushes the moving slider 211 to move along the sliding shaft 210, so that the rotating circular cutting blade 215 contacts the surface of the steel pipe. The circular cutting blade 215 cuts into the steel pipe at a uniform speed until it is completely cut off. The hydraulic electric control push rod 212 automatically resets.

[0039] S4: Waste disposal and workpiece unloading Metal chips generated during cutting fall into impurity collection hopper 601 through impurity drop trough 8, and finally flow into impurity collection box 602. Controller 7 controls the clamping hydraulic rod 307 and the limiting hydraulic rod 502 to retract synchronously. The operator removes the cut steel pipe section, and the uncut steel pipe is automatically returned to its position by the moving electric push rod 304 for later use.

[0040] To facilitate understanding of the above technical solutions of the present invention, the working principle or operation method of the present invention in actual process will be described in detail below.

[0041] In summary, by utilizing the above-mentioned technical solution of this invention, precise arc-shaped cutting of steel pipes can be completed in a single clamping operation, allowing for direct welding and replacing milling machine processing. This solves the problems of requiring secondary clamping for milling arc-shaped end faces, which accounts for more than 40% of the overall processing time (taking φ60×4mm chromium-molybdenum steel pipe as an example, the milling time for a single piece is ≥15 minutes), loss of positioning reference due to multiple sequence changes, and the perpendicularity error between the arc-shaped end face and the pipe body axis often exceeding ±1.5°, requiring manual grinding during welding. The adjustable angle design, combined with the precise triggering of automatic length setting, enables the arc-shaped end face to be cut and formed in one operation, eliminating the need for secondary milling processing. The processing time for a single piece is reduced from 22 minutes to 6 minutes, improving efficiency by 73%.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cutting device for steel pipes of off-road motorcycle frames, characterized in that, It includes a steel pipe cutting installation table (1), a steel pipe cutting assembly (2) on one side of the steel pipe cutting installation table (1), a steel pipe clamping assembly (3) on one side of the steel pipe cutting assembly (2), an automatic length fixing assembly (4) on one side of the steel pipe clamping assembly (3), a length fixing limit assembly (5) on one side of the automatic length fixing assembly (4), and an impurity treatment assembly (6) below the steel pipe cutting installation table (1). The steel pipe cutting assembly (2) includes a cutting mounting frame (201), which is connected to the steel pipe cutting mounting table (1). The middle shaft (202) is movably connected in the middle of the cutting mounting frame (201), and a transmission worm gear (203) is connected to the periphery of the middle shaft (202). A transmission worm (204) is meshed on one side of the transmission worm gear (203). The transmission worm gear (203) and the transmission worm (204) use high-precision worm gears and worms. After adjustment, they are stable and self-locking. Through the steel pipe cutting assembly (2) and the contact-type fixed length system (3), the steel pipe can be clamped once to complete the precise arc cutting, which can be directly welded, replacing milling machine processing and solving the problem of needing to clamp twice when milling arc end faces.

2. A cutting device for steel pipes of off-road motorcycle frames according to claim 1, characterized in that, The steel pipe cutting assembly (2) also includes a worm gear fixing plate (205), the worm gear fixing plate (205) is movably connected to the outer periphery of the transmission worm gear (204), the worm gear fixing plate (205) is connected to the cutting mounting frame (201), one end of the transmission worm gear (204) is connected to a servo motor (206), the housing of the servo motor (206) is connected to the worm gear fixing plate (205), one end of the intermediate shaft (202) is connected to an angle sensor (207), the outer periphery of the angle sensor (207) is connected to a sensor fixing frame (208), and the sensor fixing frame (208) is connected to the cutting mounting frame (201).

3. A cutting device for steel pipes of off-road motorcycle frames according to claim 2, characterized in that, The steel pipe cutting assembly (2) also includes a cutting mounting plate (209). The cutting mounting plate (209) is connected to the end of the intermediate shaft (202) away from the angle sensor (207). A sliding shaft (210) is installed inside the cutting mounting plate (209). A movable slider (211) is slidably fitted around the sliding shaft (210). A hydraulic electric control push rod (212) is connected around the movable slider (211). The hydraulic electric control push rod (212) is connected around the cutting mounting plate (209). A cutting motor (213) is installed inside the movable slider (211). A cutting column (214) is connected to the output end of the cutting motor (213). A circular cutting blade (215) is connected to one side of the cutting column (214).

4. A cutting device for steel pipes of off-road motorcycle frames according to claim 3, characterized in that, The steel pipe clamping assembly (3) includes an arc-shaped sliding plate (301), which is installed above the steel pipe cutting mounting table (1). A steel pipe movable mounting frame (302) is provided on one side of the arc-shaped sliding plate (301). A movable electric push rod (304) is installed inside the steel pipe movable mounting frame (302). One end of the movable electric push rod (304) is connected to a pushing movable plate (305). A clamping mounting plate (306) is symmetrically connected above the steel pipe cutting mounting table (1). A clamping hydraulic rod (307) is installed inside the clamping mounting plate (306). The output end of the clamping hydraulic rod (307) is connected to a clamping arc plate (303).

5. A cutting device for off-road motorcycle frame steel pipes according to claim 4, characterized in that, A controller (7) is installed on one side of the steel pipe cutting mounting table (1). The servo motor (206), angle sensor (207), hydraulic electric control push rod (212), cutting motor (213), moving electric push rod (304) and clamping hydraulic rod (307) are electrically connected to the controller (7).

6. A cutting device for off-road motorcycle frame steel pipes according to claim 5, characterized in that, The automatic length-fixing component (4) includes a length-fixing adjustment mounting bracket (401), which is connected to the steel pipe cutting mounting table (1). An adjustment threaded shaft (402) is movably connected inside the length-fixing adjustment mounting bracket (401). An adjustment slider (403) is threaded around the adjustment threaded shaft (402). A trigger plate (404) is connected above the adjustment slider (403). A contact switch (405) is installed on one side of the trigger plate (404). A drive motor (406) is connected to one end of the adjustment threaded shaft (402). The contact switch (405) and the drive motor (406) are electrically connected to the controller (7).

7. A cutting device for off-road motorcycle frame steel pipes according to claim 6, characterized in that, The fixed length limiting component (5) includes a limiting mounting bracket (501), which is installed on one side of the fixed length adjustment mounting bracket (401). A limiting hydraulic rod (502) is installed inside the limiting mounting bracket (501). The output end of the limiting hydraulic rod (502) is connected to a limiting arc plate (503). An arc plate limiting rubber layer (504) is installed inside the limiting arc plate (503). The limiting hydraulic rod (502) is electrically connected to the controller (7).

8. A cutting device for off-road motorcycle frame steel pipes according to claim 7, characterized in that, The steel pipe cutting installation platform (1) has an impurity drop trough (8) inside. A support frame (9) is connected below the steel pipe cutting installation platform (1). The impurity treatment component (6) includes an impurity collection hopper (601). The impurity collection hopper (601) is connected to the steel pipe cutting installation platform (1). An impurity collection box (602) is connected to the bottom of the impurity collection hopper (601). An impurity cleaning door (603) is installed on one side of the impurity collection box (602).

9. A cutting device for off-road motorcycle frame steel pipes according to claim 8, characterized in that, A pull handle (10) is connected to one side of the impurity cleaning door (603), and a glove sleeve (11) is installed around the pull handle (10).

10. A processing method for a cutting device for off-road motorcycle frame steel pipes, based on the application of the cutting device for off-road motorcycle frame steel pipes according to claim 9, characterized in that, Includes the following steps: S1: Equipment Preparation and Parameter Setting After confirming that the support frame (9) of the steel pipe cutting installation table (1) is stable and the impurity collection box (602) has been emptied, the cutting length is input through the controller (7), the drive motor (406) is started to drive the adjusting thread shaft (402) to rotate, which drives the adjusting slider (403) and the trigger plate (404) to move to the target position. The cutting angle is set, the servo motor (206) meshes with the transmission worm gear (203) through the transmission worm (204) to drive the intermediate shaft (202) to rotate, and the angle sensor (207) feeds back the data to the controller (7) in real time. S2: Steel pipe feeding and positioning locking Place the steel pipe to be cut on the arc-shaped sliding plate (301), start the moving electric actuator (304), push the moving plate (305) to make the steel pipe slide along the arc-shaped sliding plate (301) until the end contacts the arc-shaped limiting rubber layer (504) of the limiting arc plate (503), the steel pipe presses the trigger plate (404) to trigger the contact switch (405), the controller (7) starts immediately, the clamping hydraulic rod (307) pushes the clamping arc plate (303) to radially clamp the steel pipe, and the limiting hydraulic rod (502) pressurizes and fixes the end of the steel pipe; S3: Multi-axis collaborative cutting execution The cutting motor (213) drives the circular cutting blade (215) to rotate at high speed. The servo motor (206) precisely rotates the intermediate shaft (202), driving the cutting mounting plate (209) to a preset angle (0°-90° adjustable). The hydraulic electric control push rod (212) pushes the moving slider (211) to move along the sliding shaft (210), so that the rotating circular cutting blade (215) contacts the surface of the steel pipe. The circular cutting blade (215) cuts into the steel pipe at a uniform speed until it is completely cut off. The hydraulic electric control push rod (212) automatically resets. S4: Waste disposal and workpiece unloading The metal chips generated during cutting fall into the impurity collection hopper (601) through the impurity drop trough (8), and finally flow into the impurity collection box (602). The controller (7) controls the clamping hydraulic rod (307) and the limiting hydraulic rod (502) to retract synchronously. The operator moves out of the cut steel pipe section, and the uncut steel pipe is automatically returned to its position by the moving electric push rod (304) for use.

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