High strength polyethylene pipe cutting apparatus

Abstract

The application relates to the technical field of cutting equipment, in particular to high-strength polyethylene pipe cutting equipment, which comprises a cutting rack, a cutting assembly is fixedly installed on the cutting rack, a cutter holder is fixedly installed on the cutting rack, a threaded hole is formed in the upper end of the cutter holder, a screw rod II is installed in the threaded hole, a cutting blade is installed below the screw rod II, the screw rod II moves downward to press the cutting blade downward, a spring I is fixedly installed on the cutting blade in the threaded hole, the other end of the spring I is fixed to the bottom end of the threaded hole, and a rectangular hole for the cutting blade to extend out is formed in the bottom end of the threaded hole. Through cooperation between the rack fixedly installed on the fixed frame and the gear installed on the cutter holder, the cutting blade does not need to be stopped in the middle of the cutting process for adjusting the feed amount of the cutting blade, the operation time of workers is reduced, and the cutting efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of cutting equipment technology, specifically to a high-strength polyethylene pipe cutting device. Background Technology

[0002] Compared to traditional pipes, plastic pipes are lightweight, offer low flow resistance, are corrosion-resistant, and easy to install, making them a crucial component in building water supply and drainage systems. High-density polyethylene (HDPE), also known as high-strength polyethylene, boasts superior strength, toughness, corrosion resistance, and aging resistance compared to other plastic pipes, making it the second most consumed type of plastic pipe worldwide.

[0003] In building water supply and drainage pipeline engineering, HDPE pipes are mainly used in municipal water supply systems, underground water supply and drainage systems in residential areas and factories, water treatment projects, and other industrial water pipelines. During construction, workers cut HDPE pipes to the appropriate length according to on-site measurements for installation.

[0004] As the construction location changes, workers need to move the cutting equipment, so they need a portable, high-strength polyethylene pipe cutting device.

[0005] The existing manual rotary pipe cutter requires an operator to place it on the part to be cut, fix it to the HDPE pipe by adjusting the nut to prevent it from shifting during cutting, rotate the blade knob to extend the blade, and then use a lever to rotate the device to make the cut.

[0006] However, during equipment use, due to limited operating space, workers need to repeatedly perform the three processes of putting on the lever, rotating the equipment, and removing the lever, thus increasing worker operating time. Furthermore, because the high-strength polyethylene pipes being cut have thick walls, workers need to rotate the blade knob multiple times to control the blade feed, further extending cutting time. Moreover, manually adjusting the blade feed by rotating the knob introduces errors; excessive feed increases cutting resistance, slowing the worker's cutting speed, requiring readjustment; insufficient feed increases the number of rotations required, further increasing the time spent cutting HDPE pipes.

[0007] To address this, a high-strength polyethylene pipe cutting device is proposed. By using a rack and pinion mounted on the fixed frame in conjunction with gears mounted on the blade holder, the cutting process can be completed without stopping the cutting process due to adjusting the blade feed rate, thus reducing worker operation time and improving cutting efficiency. Summary of the Invention

[0008] The purpose of this invention is to provide a high-strength polyethylene pipe cutting device. By using a rack and pinion mounted on the fixed frame and a gear mounted on the blade holder, the cutting process can be completed without stopping the cutting process due to adjusting the blade feed rate, thereby reducing the operator's time and improving the cutting efficiency, thus solving the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] A high-strength polyethylene pipe cutting device includes: a cutting frame, which is divided into multiple movable frames, each of which is movably mounted with rollers, and a tightening component for fastening the cutting frame to the polyethylene pipe to be cut. The movable frames are rotatably connected to each other, and a cutting component is fixedly mounted on the cutting frame.

[0011] The cutting assembly also includes a gear disposed at the upper end of the screw; a fixing frame for cooperating with the gear is placed on the cutting frame;

[0012] An operating component is provided on both the fixed frame and the cutting frame. The operating component is used to drive the cutting frame, which is sleeved on the polyethylene pipe to be cut, to rotate.

[0013] The fixed frame is equipped with an adjustment component, which meshes with a gear. Each time the cutting frame rotates around the polyethylene pipe to be cut, the adjustment component drives the gear to rotate, thereby driving the screw to press down the cutting blade to achieve the cutting blade feed.

[0014] The fixed frame is equipped with an anti-entanglement component, which works in conjunction with the cutting blade to cut off the chips that obstruct the rotation of the cutting frame;

[0015] The inner side of the fixed frame is evenly arranged with top rods two, and a pressure plate is fixedly installed on the top rods two. The fixed frame is provided with a fastening assembly for fastening the fixed frame to the polyethylene pipe to be cut.

[0016] The fastening assembly includes two fastening blocks mounted on a fixed frame. Each fastening block has a through hole, and a bolt is placed in each through hole. Nuts are installed at both ends of the bolts to tighten the fastening blocks. When the fastening blocks are tightened, the pressure plate on the fixed frame presses against the polyethylene pipe to be cut, increasing the friction between the pressure plate and the polyethylene pipe, thereby securing the fixed frame to the polyethylene pipe.

[0017] Based on the above, the general workflow of the device of the present invention is as follows: When the worker uses it, the operating components drive the cutting frame, which is mounted on the polyethylene pipe to be cut, to rotate. Each time the cutting frame rotates one revolution around the polyethylene pipe, the adjusting components drive the gears to rotate, and the screw screws into the threaded hole to press down the cutting blade, thus feeding the cutting blade. Simultaneously, during the rotation of the cutting frame, the anti-entanglement component cooperates with the cutting blade to form a scissor-like mechanism to cut away chips that obstruct the rotation of the cutting frame. The rotation generated during cutting drives the cutting blade to feed, thereby reducing worker operation and cutting time.

[0018] Preferably, the outer side of the cutting frame is provided with ratchet teeth, and the fixed frame is provided with an operating component for rotating the cutting frame;

[0019] The operating assembly includes a base mounted on a fixed frame, a rotating shaft three mounted on the base, an operating lever driven by a worker movably mounted on the rotating shaft three, and a push rod one for pushing ratchet teeth movably mounted on the operating lever, the push rod one being rotatably connected to the operating lever.

[0020] The workflow is as follows: The operating lever, which is movably mounted on the base, is lifted. The operating lever moves the push rod upwards, and the other end of the push rod moves along the ratchet ramp on the cutting frame and falls into the groove between the ratchet teeth. The worker then presses down the operating lever, which moves the push rod downwards. The push rod pushes the ratchet teeth downwards, causing the cutting frame to rotate on the pipe surface. Compared to existing technologies, this solution eliminates the step of removing and inserting the extension rod from the cutting frame, thus reducing worker time.

[0021] Preferably, a chip rack is fixedly installed on the inner side of the fixed frame, and a chip cutting blade is fixedly installed on the chip rack.

[0022] Since this device cuts high-density polyethylene plastic pipes, strip-shaped chips are generated during the cutting process. Furthermore, the distance between the fixed frame and the cutting frame is very short during operation, causing the chips to become entangled in the fixed frame, increasing cutting resistance and even halting the cutting process. Therefore, a chip-cutting device is installed on the inner circumference of the fixed frame. To facilitate understanding of the working principle of this invention, it can be compared to the working principle of scissors. Specifically, when the cutting blade rotates and the chip-cutting blade intersects, the strip-shaped chips are clamped by both the cutting and chip-cutting blades. As the cutting blade continues to move, the strip-shaped chips are cut and fall off by the chip-cutting blades, thus preventing the chips from becoming entangled during the cutting process and increasing working time.

[0023] Preferably, the bottom end of the chip holder has a blade groove, the blade groove has a guide hole, a second spring is installed in the guide hole, a slider is fixedly installed on the second spring, a blade connecting rod is hinged to the slider, one end of the blade connecting rod is hinged to the blade clamp, the side wall of the guide hole has a pin hole, the pin hole is connected to the guide hole, a locking pin is movably installed in the pin hole, the slider has a locking groove, when the blade clamp is in the fully rotated-out state, the locking pin just falls into the locking groove, the upper end of the locking pin is connected to one end of a pin rope, and one end of the pin rope is connected to the chip holder.

[0024] With this design, when the cutting blade is needed, the lower slider of the chip holder is pushed. The slider pushes the blade connecting rod, which causes the blade clamp to rotate out of the blade slot. At the same time, the slider compresses the second spring in the guide hole. When the cutting blade rotates to a vertical position, the slider's slot is exactly below the pin hole, and the pin falls into the slot due to gravity. After cutting is completed, the pin rope on the pin is pulled up. The rope pulls the pin upward, and the pin leaves the slot, thus preventing the pin from stopping the slider. The second spring in the guide hole returns to its original position under the elastic force of the second spring. The slider pulls back the blade connecting rod, which rotates the blade clamp and cutting blade back into the blade slot, preventing workers from being cut by the cutting blade when installing and disassembling the fixed frame.

[0025] Alternatively, the cutting blade can be removed directly from the blade holder. Its advantage is its simple structure; however, its disadvantage is that the cutting blade, once disassembled and stored separately, is prone to loss, affecting the next use of the cutting machine.

[0026] Preferably, the fixed frame has multiple arc-shaped grooves, a push block is placed in the arc-shaped groove, a handle is provided on the push block, a rack is placed in the arc-shaped groove, and multiple arc-shaped grooves are connected so that the push block can push out the rack in sequence. A spring is fixed in the arc-shaped groove, and the other end of the spring is fixed to the rack.

[0027] The working principle is as follows: Pulling the handle on the push block moves the push block along the arc-shaped groove, pushing the rack out of the opening. At this time, the spring is stretched, but the rack is supported by the push block, preventing it from returning to the arc-shaped groove. As the number of racks pushed out increases, the overall length of the rack increases, resulting in more rotations of the gears engaged with the rack, a longer screw insertion length, and a larger cutting blade feed. Pushing the handle back on the push block causes it to retract, and the rack, no longer supported by the push block, retracts into the arc-shaped groove under the action of the spring force. The number of racks pushed out decreases, the overall length of the rack decreases, the number of gear rotations decreases, the screw insertion length decreases, and the cutting blade feed decreases. By controlling the push block, the cutting depth of the cutting blade is controlled, thereby controlling the feed per revolution of the cutting blade. This avoids either an excessively large cutting blade feed, which would increase resistance and prevent the operator from rotating the cutting frame for cutting, or an insufficient cutting blade feed, which would increase the number of rotations of the cutting frame required for cutting.

[0028] Preferably, the fixed frame is provided with a positioning ring, which is located below the rack. When the positioning ring contacts the tool holder, the rack can just mesh with the gear.

[0029] Because the cutting frame rotates during operation, while the fixed frame remains stationary, they are essentially two separate pieces of equipment, installed independently. Furthermore, the meshing of gears and racks between the two frames restricts the distance between them. If the distance between the cutting and fixed frames is too great or too small, the gears and racks cannot mesh, rendering the design ineffective. Therefore, a positioning ring is installed on the side of the fixed frame near the blade holder. The width of the positioning ring is exactly equal to the required distance between the blade holder on the cutting frame and the fixed frame. This facilitates the positioning of the fixed frame, reducing the number of times workers need to adjust its position and thus reducing installation time.

[0030] Preferably, a top block is movably mounted on the top end of the push rod, and the top block is angled so that it fits precisely into the groove formed by two adjacent ratchet teeth. After the push rod pushes the cutting frame to rotate, the ratchet teeth rotate, resulting in a smaller contact area between the push rod and the ratchet teeth. This reduces the friction between the push rod and the ratchet, causing the push rod and the ratchet teeth to slide.

[0031] With this design, the movable block on the top rod can rotate with the ratchet and rotate on the top rod. The contact surface of the top block always fits the ratchet, avoiding the situation where the contact area between the top rod and the ratchet is too small, resulting in too little friction between the top rod and the ratchet, which would cause the top rod to slip and prevent the operator from pressing down the operating lever to rotate the cutting frame.

[0032] Preferably, the operating lever is provided with a limiting block. When the worker presses down the operating lever, a scissor-like structure forms between the operating lever and the first push rod, and the worker's fingers happen to be located in the cut portion. Therefore, during the operation of the equipment of the present invention, the worker's fingers may be pinched. Hence, the limiting block is provided. By providing the limiting block, when the first push rod rotates in the direction of the hand, the first push rod rotates and hits the limiting block, and the limiting block prevents the first push rod from continuing to rotate, thereby avoiding injury to the worker's hand from the first push rod and the operating lever.

[0033] Preferably, the surface of the pressure plate that contacts the pipe is set as an arc. This increases the contact area between the pressure plate and the cylindrical pipe, thereby increasing the friction between the pressure plate and the pipe. As a result, when the worker cuts the pipe, the fixed frame moves under the force, preventing the fixed frame from moving on the pipe.

[0034] Preferably, the fastening block is equipped with an auxiliary buckle to assist the worker in securing the fixed frame. The fixed frame consists of two semi-circular arc frames. During installation, the worker needs to close the two semi-circular arc frames while simultaneously tightening the fastening block with bolts and nuts to secure the fixed frame. At this time, it is easy for the worker to lose grip on the fixed frame, causing the lower semi-circular arc portion of the frame to fall due to gravity, resulting in injury. With this design, during the installation process, after the worker closes the two semi-circular arc frames, the auxiliary buckle is used to attach to the fastening block of the lower semi-circular arc frame, applying an upward pulling force to the lower semi-circular arc frame. This prevents the lower semi-circular arc frame from moving even if the worker releases their grip, thus preventing it from falling and causing injury.

[0035] In summary, compared with the prior art, the beneficial effects of the present invention are as follows:

[0036] 1. By setting a rack on the fixed frame and a gear on the blade holder, when the worker cuts, the cutting frame rotates, and the cutting blade rotates with the frame. When the cutting frame rotates one revolution, the gear on the blade holder meshes with the rack on the fixed frame. The gear rotates clockwise, driving the screw to rotate clockwise. The screw screws into the threaded hole, gradually pressing down on the cutting blade, causing it to gradually extend from the rectangular hole at the bottom of the blade holder. By using the rack on the fixed frame and the gear on the blade holder, cutting of pipes can be completed without stopping midway to adjust the blade feed, reducing worker operation time and thus improving cutting efficiency.

[0037] 2. By installing a chip-cutting device, strip-shaped chips that become entangled in the fixed frame during pipe cutting are cut off. Since this device cuts high-density polyethylene plastic pipes, strip-shaped chips are generated during the cutting process. Furthermore, the distance between the fixed frame and the cutting frame is very short during use, causing the chips to become entangled in the fixed frame, increasing cutting resistance and even halting the cutting process. Therefore, a chip-cutting device is installed on the inner circumference of the fixed frame. To facilitate understanding of the working principle of this invention, the working principle of scissors can be referenced. Specifically, when the cutting blade rotates and the chip-cutting blade intersects, the strip-shaped chips are clamped by both the cutting and chip-cutting blades. As the cutting blade continues to move, the strip-shaped chips are cut and fall off by the chip-cutting blades, thus preventing the chips from becoming entangled during the cutting process and increasing working time.

[0038] 3. By installing an adjustment device, the push block controls the length of the rack, the number of rack ejections, and the total length of the rack. This changes the number of rotations of the gears meshing with the rack, thereby controlling the feed amount of the cutting blade in one revolution. This prevents the cutting blade feed from being too large, which would prevent the worker from rotating the cutting frame to continue cutting, or the cutting blade feed from being too small, which would increase the number of revolutions the worker needs to rotate the cutting frame to cut. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of the present invention;

[0040] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0041] Figure 3 for Figure 2 Cross-sectional view of section BB in the middle;

[0042] Figure 4 This is a schematic diagram of the cutting machine frame;

[0043] Figure 5 This is a front plan view of the fixed frame;

[0044] Figure 6 for Figure 5 Cross-sectional view of section C;

[0045] Figure 7 for Figure 5 Cross-sectional view of section DD;

[0046] Figure 8 for Figure 7 The diagram shows a partial enlarged view of part E when the structure shown is engaged with the cutting blade and the chip cutter is unfolded.

[0047] Figure 9 for Figure 8 A diagram showing the state of the cutting blade when it is retracted.

[0048] In the diagram: 1. Cutting frame; 2. Tool holder; 3. Fixed frame; 4. Operating lever; 5. Push rod one; 6. Chip holder; 7. Positioning ring; 8. Auxiliary buckle; 9. Pipe; 10. Arc groove; 11. Push block; 12. Spring three; 13. Limiting block; 101. Roller; 102. Connecting hole one; 103. Rotating shaft one; 201. Rectangular hole; 202. Threaded hole; 203. Spring one; 204. Cutting blade; 205. Screw; 206. Tooth Wheel; 301, Top rod II; 302, Pressure plate; 303, Connecting hole II; 304, Rotating shaft II; 305, Fastening block; 306, Base; 307, Rotating shaft III; 308, Rack; 501, Top block; 601, Chip cutter; 602, Blade connecting rod; 603, Tool groove; 604, Slider; 605, Guide hole; 606, Slot; 607, Spring II; 608, Locking pin; 609, Pin hole; 610, Pin rope; 611, Blade holder. Detailed Implementation

[0049] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0050] Example 1:

[0051] Please see Figures 1 to 9 This invention provides a high-strength polyethylene pipe cutting device, the technical solution of which is as follows:

[0052] It should be noted that: the cutting frame 1 has a connection hole 102, and a rotating shaft 103 is installed in the connection hole 102; the fixed frame 3 has a connection hole 303, and a rotating shaft 304 is installed in the connection hole 303.

[0053] During the installation phase before the worker cuts the pipe 9, the worker opens the cutting frame 1 with the rotating shaft 103 inside the connection hole 102 as the center, places it on the HDPE pipe 9, aligns the cutting blade 204 with the cutting surface, uses the tightening assembly to tighten the cutting frame 1, pre-rotates the gear 206, the gear rotation drives the screw 205 to screw into the threaded hole 202 of the blade holder 2, the screw 205 pushes the cutting blade 204 out from the rectangular opening at the lower end of the blade holder 2, and stops when the cutting blade 204 touches the HDPE pipe 9. During the blade push-out process, the spring 203 is compressed by the cutting blade 204. The worker opens the fixed frame 3 with the rotating shaft 304 inside the connecting hole 303 as the center and places it on the HDPE pipe 9. The two semi-circular frames are closed, and the auxiliary buckle 8 is used to put on the fastening block 305 of the lower semi-circular frame of the fixed frame 3, so that it is subjected to the upward pulling force of the auxiliary opening, so that the fixed frame 3 is loosely placed on the pipe 9. The fixed frame 3 is moved so that the positioning ring 7 touches the blade holder 2, and the nut on the fastening block 305 is tightened. The pressure plate 302 of the fixed frame 3 is attached and pressed tightly on the HDPE pipe 9, so that it cannot move on the HDPE pipe 9. The slider 604 at the bottom of the chip holder 6 is pushed. The slider 604 pushes the blade connecting rod 602. The blade connecting rod 602 drives the blade clamp 611 to rotate out of the blade groove 603. At the same time, the slider 604 squeezes the spring 607 inside the guide hole 605. The locking pin 608 inside the pin hole 609 falls into the locking groove 606 of the lower slider 604 due to gravity.

[0054] During the worker's cutting phase, the operator lifts the control lever 4 installed on the base 306, causing the top rod 5 to move upwards. The top rod 5 moves the top block 501 upwards, and its other end moves along the ratchet ramp on the cutting frame 1. The worker then presses down the control lever 4, causing the control lever 4 to move the top rod 5 downwards. The top rod 5 pushes the ratchet downwards, and the roller 101 on the cutting frame 1 rolls on the cylindrical surface of the HDPE pipe 9, causing the cutting frame 1 to rotate on the surface of the pipe 9. Thus, the cutting blade 204 rotates with the cutting frame 1, cutting along the H... The DPE pipe 9 is rotary-cut. When the cutting frame 1 rotates one revolution, the gear 206 on the blade holder 2 meshes with the rack 308 of the fixed frame 3. The gear 206 rotates clockwise, driving the screw 205 to rotate clockwise. The screw 205 screws into the threaded hole 202, and the screw 205 gradually presses down on the cutting blade 204. As a result, the cutting blade 204 gradually extends out from the rectangular hole 201 at the bottom of the blade holder 2 until the push rod 5 touches the limiting block 13. The push rod 5 can no longer move, and the operating lever 4 can no longer move downward. The cutting frame 1 continues to rotate, cutting the HDPE pipe 9 to this cutting depth.

[0055] During the rotation of the cutting machine, strip-shaped chips are generated. The strip-shaped chips will wrap around the top rod 301 of the fixed frame 3. The cutting blade 204 and the chip cutter 601 are intersected. The strip-shaped chips are clamped by the cutting blade 204 and the chip cutter 601. The cutting blade 204 continues to move, and the strip-shaped chips are cut off by the chip cutter 601 and fall off.

[0056] After the worker finishes cutting, they pull up the pin rope 610 on the locking pin 608. The rope pulls the locking pin 608 upward, causing it to move away from the slot 606. This prevents the locking pin 608 from stopping the slider 604 from moving, and the second spring 607 in the guide hole 605 returns to its original position under the elastic force of the second spring 607. The slider 604 pulls back the blade connecting rod 602, which rotates the blade clamp 611 and the cutting blade 601 back into the blade slot 603. The gear 206 on the rotating tool holder 2 rotates the screw 205 outward, the first spring 203 returns to its original position, and the cutting blade 204 moves upward under the elastic force of the spring, retracting into the tool holder 2. The cutting frame 1 is then disassembled from the fixed frame 3.

[0057] Example 2:

[0058] See Figures 1 to 9 This illustrates a second specific embodiment of the invention, which differs from the first specific embodiment in that the tube 9, which is the object to be cut, is a low-strength plastic.

[0059] The specific implementation method is basically the same as that in Embodiment 1. The difference is that when the worker cuts the pipe 9, he can pull the handle on the push block 11. The handle drives the push block 11 to move along the arc groove 10. The push block 11 pushes out the rack 308. At this time, the spring 3 12 is stretched. However, the rack 308 is supported by the push block 11, so the rack 308 cannot return to the arc groove 10. As the number of racks 308 pushed out increases, the overall length of the rack 308 becomes longer. This increases the number of rotations of the gear 206 meshed with the rack 308, increases the screw length of the screw 205, increases the feed amount of the cutting blade 204, increases the feed amount of the single-turn cutting blade 204, and reduces the number of rotations of the cutting machine.

Claims

1. A high strength polyethylene pipe cutting apparatus comprising: The utility model provides a cutting frame (1), the cutting frame (1) is divided into multiple movable frame, each movable frame is movably installed with the roller (101), the cutting frame (1) is installed with the tightening assembly for the cutting frame (1) is fastened to the polyethylene pipe of cutting, the movable frame is rotatably connected between, the cutting frame (1) is fixedly installed with cutting assembly; The cutting assembly includes a tool holder (2) fixedly installed on the cutting frame (1), a threaded hole (202) is formed in the upper end of the tool holder (2), a screw rod (205) is installed in the threaded hole (202), a cutting blade (204) is installed below the screw rod (205), the screw rod (205) moves downward to press the cutting blade (204), a spring (203) is fixedly installed on the cutting blade (204) in the threaded hole (202), the other end of the spring (203) is fixed to the bottom end of the threaded hole (202), a rectangular hole (201) is formed in the bottom end of the threaded hole (202) for the cutting blade (204) to extend out. The utility model has the characteristics that: The cutting assembly further includes a gear (206) arranged on the upper end of the screw rod (205), and a fixed frame (3) is placed on the cutting frame (1) to cooperate with the gear (206). The fixed frame (3) and the cutting frame (1) are jointly provided with an operation assembly, which is used to drive the cutting frame (1) sleeved on the polyethylene pipe to be cut to rotate. The fixed frame (3) is provided with an adjusting assembly, which is engaged with the gear (206), and the adjusting assembly drives the gear (206) to rotate to drive the screw rod (205) to press the cutting blade (204) to realize the feeding of the cutting blade (204) every time the cutting frame (1) rotates one round around the polyethylene pipe to be cut. The fixed frame (3) is provided with an anti-winding assembly, which cooperates with the cutting blade (204) to shear the cutting chips that hinder the rotation of the cutting frame (1). The inner side of the fixed frame (3) is uniformly arranged with a second ejector rod (301), a pressing plate (302) is fixedly installed on the second ejector rod (301), and the fixed frame (3) is provided with a fastening assembly for fastening the fixed frame (3) to the polyethylene pipe to be cut.

2. A high strength polyethylene pipe cutting apparatus as defined in claim 1, wherein: The operation assembly includes a ratchet tooth arranged on the outer circumference of the cutting frame (1), a base (306) arranged on the fixed frame (3), a third rotating shaft (307) installed on the base (306), an operating rod (4) movably installed on the third rotating shaft (307), a first ejector rod (5) movably installed on the operating rod (4) for pushing the ratchet tooth, and the first ejector rod (5) is rotatably connected to the operating rod (4).

3. A high strength polyethylene pipe cutting apparatus as defined in claim 1, wherein: The anti-winding assembly includes a cutting chip rack (6) fixedly installed on the inner side of the fixed frame (3), and a cutting chip blade (601) is fixedly installed on the cutting chip rack (6).

4. A high strength polyethylene pipe cutting apparatus as defined in claim 3, wherein: The cutting chip rack (6) is provided with a tool groove (603) at the bottom end, a guide hole (605) is arranged in the tool groove (603), a spring (607) is fixedly arranged in the guide hole (605), a sliding block (604) is fixedly arranged on the spring (607), a blade connecting rod (602) is hingedly arranged on the sliding block (604), one end of the blade connecting rod (602) is hingedly connected with a blade clamp (611), a pin hole (609) is arranged on the side wall of the guide hole (605), the pin hole (609) is connected with the guide hole (605), a pin (608) is movably arranged in the pin hole (609), a clamping groove (606) is arranged on the sliding block (604), when the blade clamp (611) is in a completely turned-out state, the pin (608) falls into the clamping groove (606), and one end of the pin (608) is connected with a pin rope (610), and the other end of the pin rope (610) is connected with the cutting chip rack (6).

5. A high strength polyethylene pipe cutting apparatus as defined in claim 1, wherein: The adjusting assembly comprises a plurality of arc-shaped grooves (10) formed in the fixed rack (3), a push block (11) is arranged in the arc-shaped groove (10), a handle is arranged on the push block (11), a rack (308) is arranged in the arc-shaped groove (10), a plurality of arc-shaped grooves (10) are communicated, so that the push block (11) can push out the rack (308) in sequence, a spring (12) is fixedly arranged in the arc-shaped groove (10), and the other end of the spring (12) is fixed on the rack (308).

6. A high strength polyethylene pipe cutting apparatus as defined in claim 5, wherein: The fixed rack (3) is provided with a positioning ring (7), the positioning ring (7) is located below the rack (308), and when the positioning ring (7) is in contact with the tool holder (2), the rack (308) can be engaged with the gear (206).

7. A high strength polyethylene pipe cutting apparatus as defined in claim 2, wherein: The top rod (5) is movably provided with a top block (501) at the top end, and the top block (501) is arranged at an angle, so that the top block (501) can be arranged in the groove formed by the adjacent two ratchet teeth.

8. A high strength polyethylene pipe cutting apparatus as defined in claim 2, wherein: The operating rod (4) is provided with a limiting block (13).

9. A high strength polyethylene pipe cutting apparatus as defined in claim 1, wherein: The surface of the pressing plate (302) in contact with the pipe (9) is arranged as a circular arc.

10. A high strength polyethylene pipe cutting apparatus as defined in claim 1, wherein: The fastening assembly comprises two fastening blocks (305) arranged on the fixed rack, and an auxiliary buckle (8) is movably arranged on the fastening block (305), which is used for assisting workers in fastening the fixed rack (3).

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