Plastic pipe fitting cutting guide device and using method

Abstract

The invention relates to a plastic pipe cutting guide device and a using method. The plastic pipe cutting guide device comprises an operation table, a first pipe diameter positioning module and a second pipe diameter positioning module which are located at the two ends of the operation table correspondingly and used for positioning a plastic pipe, and a plurality of sets of first annular frames and second annular frames are oppositely arranged on the operation table and surround the plastic pipe diameter in an interactive mode; the arc-shaped groove is formed in the middle of the operation table, the air pressure cushion is arranged in the arc-shaped groove to enhance the positioning stability, the cutting arm assembly composed of the linear bearing guide rail is integrated, a cutting tool (a saw blade or a cutting knife) is forcibly restrained to move along a preset absolutely straight path, and the problems that due to manual shaking, a notch is inclined, and burrs are too many are fundamentally solved. The section of the notch is smooth and flat and is always perpendicular to the axis of the pipe, secondary finishing is not needed, and the sealing performance and reliability of follow-up pipe fitting connection are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of plastic pipe processing technology, and in particular to a plastic pipe cutting guide device and its usage method. Background Technology

[0002] Plastic pipe fittings refer to plastic components used in piping systems for connecting, branching, reducing diameter, turning, sealing pipes, or controlling flow. They are essential components for forming a complete transport network. Pipe fitting cutting guides are tools or clamps specifically designed to assist in precise and straight cutting of plastic pipes (or piping systems containing plastic pipe fittings). Their core function is to ensure that the cut surface is perfectly perpendicular to the pipe axis, thereby providing qualified pipe ends for subsequent connections or installations.

[0003] Currently, the most commonly used cutting tools are manual or electric plastic pipe shears and saws used with simple guide devices. Traditional guide devices are usually just a simple "V"-shaped groove base and a movable baffle. During operation, the pipe is placed into the "V"-shaped groove, the baffle is pushed to the predetermined length position and manually locked, and then the operator cuts along the baffle with the saw. Traditional guide cutting only provides guidance and cannot control the path of the cutting tool (such as the saw). The saw is prone to swaying from side to side during the cutting process, resulting in a skewed cut that is not perpendicular to the pipe axis and produces a lot of burrs. The "V"-shaped groove fixes the pipe only by its own weight. Vibration during sawing can cause the pipe to rotate or bounce, which not only affects the cut quality but also poses a safety hazard of saw slippage and injury. The locking force of the baffle is insufficient, and it may shift when the saw is under force, resulting in inconsistent sizes of batch cuts. The entire cutting process depends entirely on the operator's experience and feel, making it difficult to maintain consistent quality. Summary of the Invention

[0004] The technical problem to be solved by this invention is that traditional cutting guide devices suffer from poor cut quality and safety hazards due to insecure pipe fixing and uncontrolled tool path. These poor cut quality and safety hazards prevent operators from working quickly and confidently, thus exacerbating the dependence on operator skills and the problem of poor consistency in batch processing.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A method of using a plastic pipe cutting guide device includes an operating table, an extension plate fixed to both sides of the operating table to increase the placement area of ​​the pipe, a support bracket at the bottom of the operating table, a first pipe diameter positioning module and a second pipe diameter positioning module respectively located at both ends of the operating table for positioning the plastic pipe, several sets of first circumferential frames and second circumferential frames are arranged opposite to each other on the operating table, and the two are interactively encircling the plastic pipe diameter, a cutting component is installed on the extension plate of the operating table near the second pipe diameter positioning module, the cutting module is driven to rotate through a hinged rocker arm mechanism, and an arc-shaped groove is opened in the middle of the operating table, with an air pressure pad inside the arc-shaped groove.

[0006] The beneficial effects of this invention are: by integrating a cutting arm assembly composed of linear bearing guide rails, the cutting tool saw blade or cutting knife is forced to move along a preset, absolutely straight path, fundamentally eliminating problems such as skewed cuts and excessive burrs caused by manual shaking. The cut surface is smooth, flat, and always perpendicular to the pipe axis, requiring no secondary trimming, which greatly improves the sealing performance and reliability of subsequent pipe fitting connections.

[0007] Furthermore, an extension plate for mounting the cutting components is fixed to one end of the operating table. A guide groove is provided at the bottom of the extension plate, and sliding grooves are provided on both sides of the groove to accommodate the sliding positioning of the first and second circumferential frames. An anti-deviation conveying roller group and a spherical conveying roller group are provided at the end of the extension plate to achieve precise axial conveying of the pipe fittings.

[0008] Furthermore, a limiting ring is installed at the corresponding guide groove position at the edge of the extension plate, and a limiter is installed on the inner side of the limiting ring. The arc-shaped groove is divided into a bottom arc area, a wall transition area, and an opening edge area. Anti-deviation conveying rollers for correcting the bottom deviation of the pipe diameter are symmetrically and linearly installed along the bottom arc area. Several sets of spherical conveying rollers for circumferentially rolling conveying pipe fittings are linearly installed along the wall transition area. Columnar guide rollers for preventing pipe fittings from deviating during guiding and conveying are linearly installed along the opening edge area. Displacement grooves extending to the extension plate for sliding support of the first and second circumferential frames are symmetrically opened on the operating platform.

[0009] Furthermore, the first end positioning module has the same structure as the second end positioning module. The first end positioning module includes a fixed shell that is fixedly connected to the operating table. The fixed shell has an open space inside. An arc-shaped frame for clamping the pipe diameter is arranged opposite each other in the open space. A positioning sleeve is arranged in the middle of the open space. Push frames connected to the arc-shaped frame are installed at both ends of the positioning sleeve. An adjusting shaft is provided between the arc-shaped frame and the swing frame. A positioning box is connected to the bottom of the fixed shell. A push rod fixedly connected to the positioning sleeve is inserted in the positioning box. A first hydraulic cylinder is connected to the bottom of the push rod. The first hydraulic cylinder drives the push rod and the positioning sleeve to move and controls the two sets of arc-shaped frames opposite each other to open or close. A movable part is provided between the push frame and the positioning sleeve.

[0010] Furthermore, the first and second annular frames are arranged opposite to each other. A rod is fixedly connected to the top of the first annular frame, and a corresponding insertion hole is opened on the top of the second annular frame. A sealing ring is fitted along the edge of the insertion hole. A protective box is provided in the middle of both the first and second annular frames, with a guide rod passing through the center of the protective box. A pressure rod, fixedly connected to a positioning ring, is provided below both the first and second annular frames. Slider blocks are fixedly connected to both sides of the pressure rod. Adjusting frames are fixedly connected to the bottom of both sets of pressure rods. Adjusting slots are opened on the adjusting frames. A mounting column connected to the operating table is provided at the end of the adjusting frame away from the pressure rod. A rotary joint is provided between the mounting column and the pressure column. The two sets of adjusting frames are respectively equipped with a first... The first and second rotating gears each have a second steering rod at their center. A mounting frame is installed on the operating table, and a second drive motor is installed on the mounting frame. One set of second steering rods is connected to the output end of the second drive motor. A disassembly cover is provided at the center of the side of the first and second rotating gears away from the second steering rods. An eccentric column that extends into the adjustment groove is fixed to the side of the first and second rotating gears facing the adjustment frame. The second drive motor drives the first rotating gear to rotate and drives the adjustment frame and the pressure rod to move in a preset direction through meshing with the second rotating gear. An anti-vibration sleeve is fitted on the outer side of the first and second circumferential frames.

[0011] Furthermore, both the first and second circumferential frames are equipped with inner flexible arc rings connected to one end of the guide rod. A second hydraulic cylinder is installed on the protective box, and the other end of the guide rod is connected to the output end of the second hydraulic cylinder. The second hydraulic cylinder drives the inner flexible arc rings to move through the guide rod. Connecting rods are passed between several groups of first circumferential frames in the same row, and another connecting rod is passed between several groups of second circumferential frames in the same row. Adjusting arc plates are provided near the cutting assembly position of the first and second circumferential frames. A first drive motor is installed on the adjusting arc plate. One end of the connecting rod is connected to the output end of the first drive motor, and the other end of the connecting rod is equipped with a rotating sleeve. The first drive motor drives the connecting rod to rotate and causes the opposing first and second circumferential frames to open or close.

[0012] Furthermore, a scraper for pushing the displacement of debris is fixed to the side end of the connecting rod. Adjustment arc plates are provided near the cutting component of the first and second circumferential frames. Shock-absorbing frames are attached to the side ends of the first and second circumferential frames. Extension columns are fixed to the bottom of both the first and second circumferential frames. Universal wheels are fixed to the bottom of the extension columns. A spring column is connected to the bottom of the protective box away from the first and second circumferential frames. A spring rubber damper is provided inside the spring column.

[0013] Furthermore, a first steering rod is provided between the adjusting arc plate and the adjacent first and second circumferential frames, which is connected to the second drive motor and the connecting rod. A positioning ring is sleeved on the outside of the first steering rod, and an abutment wheel is installed on the side end of the positioning ring.

[0014] Furthermore, the cutting assembly includes a sheath hinged to the extension plate, a hinged rocker arm mechanism between the sheath and the extension plate, disassembly shells on both sides of the sheath, a card holder extending from the center of the sheath, a cutting module connected to the end of the card holder away from the sheath, the cutting module being movably connected to the card holder via a rotating shaft, a third drive motor mounted on the card holder, the rotating shaft being connected to the output end of the third drive motor, and the third drive motor driving the cutting module to rotate via the rotating shaft.

[0015] According to another aspect of the present invention, a method of using a plastic pipe cutting guide device includes the following steps: S1. The operator places the plastic pipe along the operating table, so that it passes through the open circumferential frame (the first circumferential frame and the second circumferential frame) and is inserted between the arc-shaped frame of the second end positioning module. The pipe is initially aligned in the arc-shaped groove with the assistance of the anti-deviation conveying roller group and the spherical conveying roller group. S2. Radial clamping: When the control system is activated, the second drive motor operates, driving the first and second rotating gears to rotate synchronously, pushing the eccentric column to move within the adjustment groove. This causes the two sets of adjustment frames to move the first and second circumferential frames towards each other, completing the encirclement of the pipe. Immediately afterwards, the second hydraulic cylinder pushes the guide rod, causing the inner flexible arc ring (material can be polyurethane or wear-resistant rubber) to press against the pipe wall, forming a flexible and uniform clamping force. At the same time, the air pressure pad (material is airbag rubber) at the bottom of the arc groove inflates and expands, lifting and fixing the pipe from below.

[0016] End fixing: The first hydraulic cylinder pushes the push rod, so that the positioning sleeve drives the two arc-shaped frames to close through the push frame, and performs auxiliary positioning and clamping from the end of the pipe; S3. The cutting assembly starts, and the third drive motor drives the cutting module (saw blade or cutting knife) to rotate at high speed. The operator presses down (or is driven by a cylinder) the hinged rocker arm mechanism, causing the entire cutting assembly to move smoothly downward around the hinge point. The cutting module is forcibly constrained on the linear bearing guide rail and moves vertically downward, completing the cutting operation cleanly and efficiently. S4. After cutting is completed, the rocker arm is raised, the cutting assembly is reset, the first drive motor is started, the connecting rod is driven to rotate, and the scraper at its side end is rotated to scrape the main debris that falls on the operating table to the chip collection area for easy centralized cleaning. All clamping mechanisms are released, the cut pipe is taken out, and one work cycle is completed.

[0017] The beneficial effects of adopting the above-mentioned further solution are: the original multi-point collaborative ring-shaped fixing system (first and second ring frames, end positioning module) combined with air pressure cushions achieves all-round, flexible and self-adaptive rigid fixing of the pipe, eliminates the rotation, bouncing or displacement of the pipe during the cutting process, forms physical isolation, effectively avoids the risk of the cutting tool slipping and injuring people, and provides extremely high safety guarantee; The entire system is controlled by electro-hydraulic drive (first and second hydraulic cylinders, drive motor), realizing semi-automatic operation of the entire process of pipe positioning, clamping, conveying and cutting length. This greatly reduces the dependence on the operator's personal skills and experience, and ensures extremely high dimensional consistency and production efficiency in batch operations. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a plastic pipe cutting guide device and its usage method according to the present invention; Figure 2 This is a schematic diagram of the operating table and cutting assembly of the present invention; Figure 3 This is a schematic diagram of the first end positioning module of the present invention; Figure 4 This is a schematic diagram of the first circumferential frame of the present invention; Figure 5 This is a schematic diagram of the inner flexible arc ring of the present invention; Figure 6 This is a schematic diagram of the adjusting arc plate of the present invention; Figure 7 This is a schematic diagram of the first circumferential frame of the present invention from another angle.

[0019] The attached diagram lists the components represented by each number as follows: 1. Operating platform; 2. First pipe diameter positioning module; 3. First circumferential frame; 4. Second circumferential frame; 5. Cutting assembly; 6. Second pipe diameter positioning module; 101. Expansion plate; 102. Bracket; 103. Arc groove; 104. Columnar guide roller; 105. Air pressure cushion; 106. Spherical conveyor roller; 107. Anti-deviation conveyor roller; 108. Extension plate; 109. Guide groove; 110. Limiting device Ring; 111, Limiter; 112, Slide groove; 113, Displacement groove; 201, Swing frame; 202, Adjusting shaft; 203, Push frame; 204, Positioning sleeve; 205, Push rod; 206, Positioning box; 207, First hydraulic cylinder; 208, Arc frame; 209, Fixed shell; 301, Protective box; 302, Shock absorber frame; 303, Connecting rod; 304, Scraper; 305, Rotating sleeve; 3 06. Extension column; 307. Caster wheel; 308. Second hydraulic cylinder; 309. Insert rod; 310. Anti-vibration sleeve; 311. Inner flexible arc ring; 312. First drive motor; 313. Insertion hole; 314. Sealing ring; 315. Adjusting arc plate; 316. Positioning ring; 317. First steering rod; 318. Abutment wheel; 319. Pressure rod; 320. Slider; 321. Spring column; 322. Mounting bracket; 323. Second drive motor; 324. Second steering rod; 325. Removal cover; 326. Adjustment bracket; 327. Mounting column; 328. Rotary joint; 329. First rotating gear; 330. Second rotating gear; 331. Eccentric column; 332. Adjustment groove; 501. Removal shell; 502. Protective sleeve; 503. Card holder; 504. Cutting module; 505. Third drive motor. Detailed Implementation

[0020] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0021] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0022] Example 1; as Figures 1-5 As shown, it includes an operating table 1, with extension plates 101 fixed to both sides of the operating table 1 to increase the placement area of ​​pipe fittings, and a support 102 at the bottom of the operating table 1 for support. The operating table 1 is provided with a first pipe diameter positioning module 2 and a second pipe diameter positioning module 6 at both ends for positioning the plastic pipe diameter. Several sets of first circumferential frames 3 and second circumferential frames 4 are arranged opposite each other on the operating table 1, and the two are arranged to interlock and embrace the plastic pipe diameter. The cutting component 5 is installed on the extension plate 108 of the operating table 1 near the second pipe diameter positioning module 6. The cutting module 504 is driven to rotate through the hinged rocker arm mechanism. An arc groove 103 is opened in the middle of the operating table 1. The arc groove 103 is adapted to the plastic pipe diameter and has a built-in air pressure pad 105 to enhance the positioning stability. The guide groove 109 at the bottom of the extension plate 108 of the operating table 1 is provided with sliding grooves 112 on both sides to accommodate the sliding positioning of the first circumferential frame 3 and the second circumferential frame 4. The anti-deviation conveying roller 107 set and the spherical conveying roller 106 set at the end of the extension plate 108 realize the axial precise conveying of the pipe fittings. A limiting ring 110 is installed at the upper edge of the extension plate 108, corresponding to the guide groove 109. A limiter 111 is installed on the inner side of the limiting ring 110 to ensure precise positioning of the circumferential frame movement. The arc-shaped groove 103 is divided into a bottom arc area, a wall transition area, and an opening edge area. Anti-deviation conveying rollers 107 for correcting pipe bottom deviation are symmetrically and linearly installed along the bottom arc area. Several sets of spherical conveying rollers 106 for circumferentially rolling pipe fittings are linearly installed along the wall transition area. Columnar guide rollers 104 for preventing pipe fitting deviation and guiding the conveying are linearly installed along the opening edge area. Together, they constitute a complete pipe conveying and guiding system.

[0023] During operation, the operator places the plastic pipe along the operating table 1, passes it through the open circumferential frame, and inserts it between the arc-shaped frames 208 of the second end positioning module. The pipe is initially aligned in the arc-shaped groove 103 with the assistance of the anti-deviation conveying rollers 107 and the spherical conveying rollers 106. Subsequently, the second drive motor 323 operates, driving the first rotating gear 329 and the second rotating gear 330 to rotate synchronously, pushing the eccentric column 331 to move in the adjustment groove 332, causing the two sets of adjustment frames 326 to drive the first circumferential frame 3 and the second circumferential frame 4 to move towards each other, completing the encirclement of the pipe. Next, the second hydraulic cylinder 308 pushes the guide rod, causing the inner flexible arc ring 311 (made of polyurethane or wear-resistant rubber) to press against the pipe wall, forming a flexible and uniform clamping force. The first hydraulic cylinder 207 pushes the push rod 205, causing the positioning sleeve 204 to drive the two arc-shaped frames 208 to close through the push frame 203, thus performing auxiliary positioning and clamping from the end of the pipe. When the cutting assembly 5 is started, the third drive motor 505 drives the cutting module 504 to rotate at high speed. The operator presses down the hinged rocker arm mechanism, so that the entire cutting assembly 5 moves smoothly down through the hinge point to complete the cutting operation.

[0024] Example 2: Please refer to Figure 1 - Figure 7 Based on Example 1, an automated control system and a sensor monitoring system were added to form an intelligent cutting and quality monitoring system.

[0025] Specifically, a laser rangefinder sensor (recommended model SICK DT50 series) has been added for accurate measurement of pipe length; a pressure sensor (recommended model Honeywell FSS series) has been added to the arc frame 208 and the inner flexible arc ring 311 to monitor the clamping force in real time; and an infrared through-beam sensor (recommended model OMRON E3Z series) has been set on the cutting path to detect the cutting depth.

[0026] During operation, the automated control system first uses a laser rangefinder to accurately measure the length of the pipe and automatically locate the cutting position. The pressure sensor provides real-time feedback of clamping force data to ensure that the clamping force is within the set range, preventing the pipe from slipping and avoiding crushing and deformation. During the cutting process, infrared photoelectric sensors monitor the downward trajectory and cutting depth of the cutting module 504 in real time to ensure complete cutting without damaging the equipment; all sensor data are collected into the PLC control system (Siemens S7-1200 series is recommended) to achieve fully automated operation and quality monitoring.

[0027] The above working principle can be summarized as follows: through innovative mechanical structure design combined with sensor monitoring and automatic control system, precise control of the entire process of plastic pipe fitting from positioning, clamping to cutting is achieved. Multi-point collaborative ring-shaped fixing system ensures stable clamping, linear guide rail cutting system ensures cut quality, and sensor system realizes process monitoring, ultimately achieving efficient, high-quality and safe cutting effect.

[0028] The main structure of the operating table 1 and the circumferential frame can be made of aerospace-grade aluminum alloy (such as 7075-T6) to improve rigidity and durability; the contact parts of the circumferential frame can be made of engineering plastic POM or surface-coated polyurethane material to ensure wear resistance and avoid damage to the pipe surface; the cutting module 504 can use a carbide-coated saw blade to improve service life.

[0029] Specifically, the air pressure pad 105 is an inflatable airbag embedded in the arc-shaped groove 103 of the operating table 1. It is inflated and deflated by an external air pump. The material is high wear-resistant polyurethane coated nylon cloth, which has good airtightness and fatigue resistance.

[0030] Hinged rocker arm mechanism: can be specified as a four-bar linkage or simply a hinge shaft with a torsion spring or pneumatic damping rod to ensure smooth pressing and effortless lifting.

[0031] Moving parts (in the end positioning module): These are specifically bearings or sliding sleeves, ensuring the smooth movement of the pusher 203 in the positioning sleeve 204.

[0032] Seismic Sleeve 310: It is recommended that the material be engineering plastic (such as POM) or a rubber-coated layer to absorb the impact vibration and noise when the circumferential frame closes.

[0033] Various rollers (anti-deviation, spherical, cylindrical): The core is made of steel, and the outer layer is covered with wear-resistant nitrile rubber or polyurethane, providing friction while preventing scratches on the pipe. The above are merely preferred embodiments of the present invention and are 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 plastic pipe cutting guide device, characterized in that, It includes an operating table (1), with extension plates (101) fixed on both sides of the operating table (1) to increase the area for placing pipe fittings. The bottom of the operating table (1) is supported by a bracket (102). At both ends of the operating table (1), there are first pipe diameter positioning modules (2) and second pipe diameter positioning modules (6) for positioning plastic pipes. Several sets of first circumferential frames (3) and second circumferential frames (4) are arranged opposite to each other on the operating table (1), and the two are interactively encircling the plastic pipe diameter. A cutting component (5) is installed on the extension plate (108) of the operating table (1) near the second pipe diameter positioning module (6). The cutting module (504) is driven to rotate through a hinged rocker arm mechanism. An arc-shaped groove (103) is opened in the middle of the operating table (1), and an air pressure cushion (105) is built into the arc-shaped groove (103).

2. The plastic pipe cutting guide device according to claim 1, characterized in that, One end of the operating table (1) is fixed with an extension plate (108) for mounting the cutting component (5). The bottom of the extension plate (108) of the operating table (1) is provided with a guide groove (109). The two sides of the groove are provided with sliding grooves (112) to adapt to the sliding positioning of the first circumferential frame (3) and the second circumferential frame (4). The end of the extension plate (108) is provided with a set of anti-deviation conveying rollers (107) and a set of spherical conveying rollers (106) to realize the axial precise conveying of the pipe fittings.

3. The plastic pipe cutting guide device according to claim 2, characterized in that, A limiting ring (110) is installed at the position of the guide groove (109) at the upper edge of the extension plate (108). A limiter (111) is installed on the inner side of the limiting ring (110). The arc groove (103) is divided into a bottom arc area, a wall transition area and an opening edge area. Anti-deviation conveying rollers (107) for correcting the bottom deviation of the pipe diameter are installed symmetrically and linearly along the bottom arc area. Several sets of spherical conveying rollers (106) for circumferentially rolling conveying pipe fittings are installed linearly along the wall transition area. Columnar guide rollers (104) for preventing pipe fittings from deviating and guiding the conveying are installed linearly along the opening edge area. Displacement grooves (113) are symmetrically opened on the operating table (1) and extend to the extension plate (101) for sliding support of the first circumferential frame (3) and the second circumferential frame (4).

4. The plastic pipe cutting guide device according to claim 3, characterized in that, The first end positioning module has the same structure as the second end positioning module. The first end positioning module includes a fixed shell (209) fixedly connected to the operating table (1). The fixed shell (209) has an open space inside. An arc-shaped frame (208) for clamping the pipe diameter is provided in the open space. A positioning sleeve (204) is provided in the middle of the open space. Pushing frames (203) connected to the arc-shaped frame (208) are installed at both ends of the positioning sleeve (204). The arc-shaped frame (208) and the swing frame (201) are connected to each other. An adjusting shaft (202) is provided between the fixed shell (209) and a positioning box (206) is connected to the bottom of the fixed shell (209). A push rod (205) fixed to the positioning sleeve (204) is provided in the positioning box (206). A first hydraulic cylinder (207) is connected to the bottom of the push rod (205). The first hydraulic cylinder (207) drives the push rod (205) and the positioning sleeve (204) to move and controls the two sets of opposite arc frames (208) to open or close. A movable part is provided between the push frame (203) and the positioning sleeve (204).

5. A plastic pipe cutting guide device according to claim 4, characterized in that, The first circumferential frame (3) and the second circumferential frame (4) are arranged opposite to each other. A plug rod (309) is fixedly connected to the top of the first circumferential frame (3). The top of the second circumferential frame (4) is provided with a plug hole (313) corresponding to the plug rod (309). A sealing ring (314) is attached to the edge of the plug hole (313). A protective box (301) is provided in the middle of the first circumferential frame (3) and the second circumferential frame (4). A guide rod is passed through the center of the protective box (301). A positioning ring (314) is provided below the first circumferential frame (3) and the second circumferential frame (4). 6) Fixed bearing rods (319), with sliders (320) fixed on both sides of the bearing rods (319), and adjusting frames (326) fixed to the bottom of both sets of bearing rods (319). Adjusting slots (332) are provided on the adjusting frames (326). The end of the adjusting frame (326) away from the bearing rods (319) is provided with a mounting column (327) connected to the operating table (1). A rotary joint (328) is provided between the mounting column (327) and the bearing column. The two sets of adjusting frames (326) are respectively provided with first rotating teeth that mesh with each other. The first rotating gear (329) and the second rotating gear (330) are both equipped with a second steering rod (324) at their centers. A mounting bracket (322) is installed on the operating table (1), and a second drive motor (323) is installed on the mounting bracket (322). One set of second steering rods (324) is connected to the output end of the second drive motor (323). The first rotating gear (329) and the second rotating gear (330) are equipped with a second steering rod (324) at their centers on the side away from the second steering rod (324). There is a disassembly cover (325). The first rotating gear (329) and the second rotating gear (330) are both fixed with an eccentric column (331) that extends into the adjustment groove (332) on the side facing the adjustment frame (326). The second drive motor (323) drives the first rotating gear (329) to rotate and drives the adjustment frame (326) and the pressure rod (319) to move in a preset direction through meshing with the second rotating gear (330). The first circumferential frame (3) and the second circumferential frame (4) are fitted with shock-absorbing sleeves (310).

6. A plastic pipe cutting guide device according to claim 5, characterized in that, Both the first circumferential frame (3) and the second circumferential frame (4) have an inner flexible arc ring (311) connected to one end of the guide rod on their inner sides. A second hydraulic cylinder (308) is installed on the protective box (301). The other end of the guide rod is connected to the output end of the second hydraulic cylinder (308). The second hydraulic cylinder (308) drives the inner flexible arc ring (311) to move through the guide rod. Connecting rods (303) are passed between several groups of first circumferential frames (3) in the same row. Another connecting rod (303) is passed between several groups of second circumferential frames (4) in the same row. 03), the first circumferential frame (3) and the second circumferential frame (4) are provided with an adjustment arc plate (315) near the cutting assembly (5). The adjustment arc plate (315) is equipped with a first drive motor (312). One end of the connecting rod (303) is connected to the output end of the first drive motor (312). The other end of the connecting rod (303) is provided with a rotating sleeve (305). The first drive motor (312) drives the connecting rod (303) to rotate and drives the relative first circumferential frame (3) and second circumferential frame (4) to open or close.

7. A plastic pipe cutting guide device according to claim 6, characterized in that, A scraper (304) for pushing the displacement of debris is fixed to the side end of the connecting rod (303). An adjusting arc plate (315) is provided near the cutting component (5) of the first circumferential frame (3) and the second circumferential frame (4). A shock-absorbing frame (302) is attached to the side end of the first circumferential frame (3) and the second circumferential frame (4). An extension column (306) is fixed to the bottom of the first circumferential frame (3) and the second circumferential frame (4). A universal wheel (307) is fixed to the bottom of the extension column (306). A spring column (321) is connected to the bottom of the protective box (301) away from the first circumferential frame (3) and the second circumferential frame (4). A spring rubber damper is provided inside the spring column (321).

8. A plastic pipe cutting guide device according to claim 7, characterized in that, A first steering rod (317) is provided between the adjusting arc plate (315) and the adjacent first circumferential frame (3) and second circumferential frame (4) to connect with the second drive motor (323) and connecting rod (303). A positioning ring (316) is sleeved on the outside of the first steering rod (317), and an abutment wheel (318) is installed on the side end of the positioning ring (316).

9. A plastic pipe cutting guide device according to claim 8, characterized in that, The cutting assembly (5) includes a sleeve (502) hinged to the extension plate (108). A hinged rocker arm mechanism is provided between the sleeve (502) and the extension plate (108). A disassembly shell (501) is installed on both sides of the sleeve (502). A card holder (503) is extended from the center of the sleeve (502). A cutting module (504) is connected to one end of the card holder (503) away from the sleeve (502). The cutting module (504) is movably connected to the card holder (503) through a rotating shaft. A third drive motor (505) is installed on the card holder (503). The rotating shaft is connected to the output end of the third drive motor (505). The third drive motor (505) drives the cutting module (504) to rotate through the rotating shaft.

10. A method of using a plastic pipe fitting cutting guide device, comprising the plastic pipe fitting cutting guide device as described in claim 9, characterized in that, Includes the following steps: S1. The operator places the plastic pipe along the operating table (1), so that it passes through the opened first circumferential frame (3) and the second circumferential frame (4), and inserts it between the arc frame (208) of the second end positioning module. The pipe is initially aligned in the arc groove (103) with the assistance of the anti-deviation conveying roller (107) group and the spherical conveying roller (106) group. S2, Radial clamping: The control system is started, the second drive motor (323) works, driving the first rotating gear (329) and the second rotating gear (330) to rotate synchronously, pushing the eccentric column (331) to move in the adjustment groove (332), so that the two sets of adjustment frames (326) drive the first circumferential frame (3) and the second circumferential frame (4) to move towards each other, completing the encirclement of the pipe. Then, the second hydraulic cylinder (308) pushes the guide rod, so that the inner flexible arc ring (311) presses the pipe wall, forming a flexible and uniform clamping force. At the same time, the air pressure pad (105) (made of airbag rubber) at the bottom of the arc groove (103) inflates and expands, lifting and fixing the pipe from below. End fixing: The first hydraulic cylinder (207) pushes the push rod (205), so that the positioning sleeve (204) drives the two arc-shaped frames (208) to close through the push frame (203), and performs auxiliary positioning and clamping from the end of the pipe; S3. The cutting assembly (5) is started, and the third drive motor (505) drives the cutting module (504) (saw blade or cutting knife) to rotate at high speed; The operator presses down (or is driven by a cylinder) the hinged rocker arm mechanism, so that the entire cutting assembly (5) moves smoothly down around the hinge point. The cutting module (504) is forcibly constrained on the linear bearing guide rail and moves vertically downward, completing the cutting operation cleanly and efficiently. S4. After the cutting is completed, the rocker arm is lifted, the cutting assembly (5) is reset, the first drive motor (312) is started, the connecting rod (303) is driven to rotate, and the scraper (304) on its side is rotated to scrape the main debris that falls on the operating table (1) to the debris collection area for easy centralized cleaning. All clamping mechanisms are released, the cut pipe is removed, and one work cycle is completed.

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