A high-strength polyethylene pipe welding device

Abstract

This invention relates to the field of polyethylene welding equipment technology, specifically a high-strength polyethylene pipe welding equipment; it includes a welding frame, fixing rods, pipe clamps, handles, a pipe to be welded, a water tank, a cleaning mechanism, a dustproof mechanism, and a triggering mechanism; two fixing rods are symmetrically installed on the welding frame, and multiple pipe clamps are slidably installed on the two fixing rods. The pipe clamps are used to fix the pipe to be welded, and the handle is fixedly installed on one of the pipe clamps; the dustproof mechanism is fixedly installed on the inner side of the pipe clamps, the water tank is fixedly installed on the dustproof mechanism, and the cleaning mechanism is fixedly installed inside the dustproof mechanism; the triggering mechanism is fixedly installed in the dustproof mechanism; it provides a clean, sealed space for the welding process to ensure welding quality; therefore, by providing a sealed space for the cleaning process of the pipe to be welded and the welding process, dust and sand from the external environment are isolated.

Description

Technical Field

[0001] This invention relates to the field of polyethylene welding equipment technology, and specifically to a high-strength polyethylene pipe welding equipment. 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. The welding methods mainly include hot-melt welding and electrofusion welding. Among them, hot-melt welding has higher stability, and the welding quality can be basically guaranteed by inspecting the weld joint. Therefore, hot-melt welding is often used as the welding method on the construction site of HDPE pipes. If the sealing effect at the pipe joint to be welded is not strong, it will lead to insufficient fusion at the weld joint, resulting in crack defects and unqualified welding of the pipe joint. The usual cleaning method is to manually wipe the pipe joint to be welded with a clean cloth or paper towel to enhance its sealing performance.

[0004] However, due to length limitations for vehicle transportation, the factory cuts HDPE pipes into lengths for easy transport. During construction, workers then weld the HDPE pipes on-site. Construction sites are often dusty, and welding HDPE pipes in such dusty and windy environments can lead to poor sealing at the weld joint during manual cleaning and after the welding plate is removed. This can result in insufficient fusion, causing cracks at the weld joint and rendering the weld unqualified.

[0005] While it's true that setting up a simple construction tent can ensure a tight seal and prevent welding quality issues, such a tent only provides basic isolation and cannot fundamentally solve the sealing problem. Welding HDPE pipes in this environment may affect the welding quality, leading to weld failure or other quality problems.

[0006] In view of the above, in order to overcome the above technical problems, the present invention designs a high-strength polyethylene pipe welding device, which solves the above technical problems. Summary of the Invention

[0007] The technical problem to be solved by the present invention is that the existing polyethylene pipe welding equipment has difficulty in ensuring the internal space sealing during the welding process. Insufficient sealing will cause impurities and dust to enter the welding equipment during the welding process, resulting in insufficient fusion and cracks at the welded part of the pipe end, which will have an indirect or direct impact on the welding quality.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] This invention provides a high-strength polyethylene pipe welding device, comprising a welding frame, fixing rods, pipe clamps, a handle, a pipe to be welded, a water tank, an auxiliary welding mechanism, a sealing mechanism, and a triggering mechanism. Two fixing rods are symmetrically installed on the welding frame, and multiple pipe clamps are slidably installed on the two fixing rods. The pipe clamps are used to fix the pipe to be welded, and one of the pipe clamps is fixedly installed with the handle. The sealing mechanism is fixedly installed on the inner side of the pipe clamp, and the water tank is fixedly installed on the sealing mechanism. When the cover is closed, the sealing mechanism uses an elastic element in conjunction with the rods to automatically reset the auxiliary welding mechanism. The auxiliary welding mechanism is fixedly installed inside the sealing mechanism. Under the auxiliary water spray dust suppression effect of the water tank, the auxiliary welding mechanism is driven by the triggering mechanism to push and scrape away dust. The triggering mechanism is fixedly installed in the sealing mechanism. The triggering mechanism uses the downward insertion force during the necessary heating stage in the welding process to drive the operation of other mechanisms.

[0010] Based on the above, its working principle is roughly as follows: the dust cover isolates the welding process from the outside world, the dust removal mechanism cleans the dust in the enclosed space, and as the heating plate is inserted from the socket on the dust cover, the plate surface cleaning units on both sides of the socket clean the plate surface on both sides of the heating plate. With the power of the heating plate insertion, the tube surface auxiliary welding mechanism moves downward, and the tube surface auxiliary welding mechanism cleans the tube surface of the pipe to be welded during the downward movement.

[0011] This design creates a sealed space for the HDPE pipe welding process, preventing dust from being blown by the wind and contaminating the pipe surface. The dust removal mechanism cleans the dust in the enclosed space, providing a clean environment for subsequent cleaning of the heating plate and pipe surface. The auxiliary welding mechanism then cleans the heating plate and welding surface, thus preventing dust contamination of the pipe joint surface in windy and dusty environments, which could lead to insufficient fusion at the weld and thus avoid defects in the welding of the pipe joint.

[0012] The auxiliary welding mechanism includes a cleaning plate, a cleaning groove, a return spring, a locking pin, a pin groove, a slot, and a cleaning assembly. The cleaning plate is slidably installed below the sealing mechanism. The cleaning groove is formed above the cleaning plate, and the locking pin is slidably installed on the cleaning groove. The rotation angle of the locking pin is set to 60°-120°. If the rotation angle of the locking pin is less than 60°, the cleaning working area will be incomplete, and some four feet will not be completely cleaned. In the long-term use, this may lead to poor welding quality and reduced work efficiency. When the rotation angle is greater than 120°, it will generate a large impact force on the cleaning groove, which is not conducive to the long-term and repeated operation of the auxiliary welding mechanism. The stability of the operation; one end of the locking pin is fixedly installed on one end of the return spring, and the other end of the return spring is fixedly installed on the side of the cleaning groove. The length of the return spring is set to 8-12cm. When the length of the return spring is less than 8cm, its buffer area is small and it cannot achieve the reset function of the locking pin. When the length of the return spring is greater than 12cm, its reset effect is poor, the structure is loose during movement, and it is not conducive to quick and stable reset work; the locking mechanism is provided with the pin groove, the pin groove is located around the locking pin, the slot is opened next to the pin groove, and the cleaning component is fixedly installed at the lower part of the sealing mechanism.

[0013] The cleaning assembly includes a wiping plate, a guide rail, a support spring, a slider, a connecting rod, and rubber rings. The wiping plate is fixedly installed at the lower center of the sealing mechanism. The guide rail is fixedly installed on the wiping plate, and a break is provided at the intersection of the guide rail and the movement trajectory of the wiping plate. One end of the support spring is fixedly installed inside the sealing mechanism, and the other end of the support spring is fixedly installed with one end of the connecting rod. The other end of the connecting rod is movably installed below the wiping plate. The rubber rings are linearly arrayed on the wiping plate, and the rubber rings are inclined at 45°-60°. When the inclination angle of the rubber ring is less than 45°, the friction force provided is small, making the fixing effect unstable. When the angle is greater than 60°, the friction force is large, which is not conducive to the operation of the cleaning assembly, requiring the overcoming of large friction forces and bringing unnecessary safety hazards. The number of rubber rings is set to 4-8. When the number is less than 4, the fixing effect is unstable. When the number is greater than 8, the distance between adjacent rubber rings is too small, which is not conducive to the operation of the cleaning assembly.

[0014] A scouring pad is fixedly installed on the wiping plate. Stabilizing protrusions are formed around the slider, and the surface of these protrusions is coated. This coating enhances the wear resistance of the slider, improves its sliding stability, and extends its service life. The rubber ring has oblique triangular grooves with an angle of 60°. This 60° angle facilitates the fit of the rubber ring. The spacing between adjacent grooves is 1-2 cm. A spacing less than 1 cm results in excessive friction, which is detrimental to movement stability; a spacing greater than 2 cm provides insufficient stability. Preferably, the cleaning plate is fitted with multiple rubber rings for securing the cleaning cloth. These rubber rings are arranged at a 50° angle on the cleaning plate. When the cleaning cloth on the cleaning plate cleans the heating plate and the pipe to be melted, the high friction can cause the cleaning cloth to loosen. This design uses rubber rings to secure the cleaning cloth to the cleaning plate through their elasticity. If this method is not adopted, using spring clips to clamp the clean cloth to the cleaning plate can also achieve a secure hold. However, the spring clips are relatively rigid, and when the cleaning plate slides up and down for cleaning, the spring clips may scratch the surface of the pipe to be welded. Therefore, during welding, the scratched areas will cause defects in the weld. If ropes are used to bind the clean cloth, the binding time is long. Rubber rings, on the other hand, are relatively soft and undergo elastic deformation under force, without damaging the surface of the pipe to be welded.

[0015] Due to the elasticity of the rubber ring, it tends to shrink to its minimum diameter, causing it to be vertical. As the cleaning plate moves vertically during cleaning, the portion of the pipe to be fused that overlaps with the rubber ring's movement path only contacts the ring, resulting in poor cleaning of this contact surface. This leads to insufficient fusion at this point, potentially causing cracks and defects at the pipe joint. To prevent these defects, the larger the angle of inclination of the rubber ring relative to the vertical, the less impact it has on the cleanroom cloth. However, a larger angle also requires more force from the worker when installing the cleanroom cloth. Therefore, a middle value is chosen: the rubber ring is tilted at 50° relative to the vertical, ensuring consistent contact between the pipe to be fused and the cleanroom cloth, thus preventing insufficient fusion and cracks, and ultimately, defects at the pipe joint.

[0016] Preferably, the cleaning component includes a cleaning groove with slots on both sides of the inlet facing each other. A plurality of reset springs are uniformly fixedly installed in the cleaning groove. The cleaning plate is fixedly installed at the other end of the reset spring. When the reset spring is in its natural state, the cleaning plate extends out of the slot of the cleaning groove.

[0017] Its working principle is as follows: Before the heating plate is inserted, the return spring is in its normal state, and the cleaning plate extends from the opening of the cleaning groove. When the heating plate is inserted, the heating plate and the cleaning plate move relative to each other, and the cleaning plate in the cleaning groove cleans the surface of the heating plate. This prevents the heating plate from being covered with dust before use. This dust would otherwise remain at the welding point during the heating process, thus preventing defects in the welding of the pipe joint to be welded.

[0018] Preferably, a locking pin is fixedly installed at one end of the cleaning plate connected to the reset spring, and pin grooves are symmetrically opened on the dust cover. A retaining groove is provided at the end of the pin groove. The pin groove is connected to the cleaning groove. The horizontal direction of the pin groove forms an angle with the direction of the spring force of the reset spring, and the retaining groove is in the same direction as the spring force of the reset spring.

[0019] This design ensures the heating plate fully retracts into the cleaning groove. Simultaneously, the return spring compresses, and the locking pin moves along the pin groove to its endpoint. At this point, the heating plate no longer applies pressure to the cleaning plate. However, because the horizontal direction of the pin groove forms an angle with the direction of the return spring's force, the locking pin, under the spring's force, rotates into a slot on the pin groove. The locking pin cannot return to its original position, thus preventing the cleaning plate from popping out under the spring's force. This prevents the clean cloth on the cleaning plate from being burned upon contact with the heating plate during welding and removal, ensuring the cleaning cloth's effectiveness in subsequent cleaning cycles.

[0020] The sealing mechanism includes a dust cover, a water supply pipe, a water mist nozzle, a baffle, a housing, a cover plate, a transparent plastic plate, and a sponge pad. The housing is fixedly mounted on the welding frame, and the dust cover is movably mounted on the housing. The edges of the dust cover are rounded, with a radius of 2-3 cm. A radius less than 2 cm would result in a sharp edge that could easily damage operators and other mechanisms, while a radius greater than 3 cm would make it too smooth and difficult to operate. The water supply pipe is fixedly mounted under the water tank, and the water mist nozzle is located below the water supply pipe. Two water mist nozzles are installed. A baffle is provided between the nozzle and the triggering component. The bottom of the baffle is arched, which facilitates the dripping of water droplets. A transparent plastic plate is provided on the side of the dust cover near the handle. The cover plate is fixedly installed on the top of the dust cover. The sponge pad is fixedly installed around the dust cover. The thickness of the sponge pad is set to 3-5cm. When the thickness of the sponge pad is less than 3cm, its sealing effect is poor. When the thickness of the sponge pad is greater than 5cm, although the sealing effect is better, it may cause blockage and jamming during the operation of the sealing mechanism.

[0021] It should be noted that during HDPE pipe welding, the surface of the pipe to be welded must be kept clean and dry to ensure a good weld. To avoid welding failure due to water droplets or other impurities, a baffle can be installed below the pipe opening. However, in practice, workers need to remove the heating plate, causing the pipe to move and separate from it. This may cause condensed water droplets on the baffle to fall onto the surface of the pipe to be welded, resulting in a wet and cooled surface and a decrease in weld quality. Considering that workers typically move the pipe 30-50mm when removing the heating plate, and the baffle should be at least 50mm away from the spigot, care should be taken to prevent the baffle from being too close to the water mist nozzle when setting up the water mist spraying device for dust removal, so as not to affect the spraying range and dust removal effect. Taking all factors into account, it is recommended that the baffle be positioned 50-80mm away from the spigot. This ensures dust removal while preventing water droplets from falling onto the pipe surface even when the worker moves the pipe to be welded, thus ensuring weld quality.

[0022] With this design, pressing the water spray switch will cause the water mist nozzle at the top of the dust cover cavity to spray water mist. The water mist adheres to the dust inside the cavity and cleans it. By setting baffles, two baffles prevent the nearest water mist nozzle from spraying water mist onto the surface of the pipe to be melted, thus ensuring that the surface of the pipe to be melted is dry while cleaning the dust inside the cavity, providing a clean environment for subsequent cleaning of the heating plate and pipe surface.

[0023] It should be noted that, to prevent water droplets from splashing onto the surface of the pipe to be welded and affecting the welding quality, the bottom of the baffle is designed in an arch shape. This allows the water droplets condensing on the baffle to flow to both sides and fall down along the arched bottom, thus preventing water droplets from splashing and affecting the dryness of the surface of the pipe to be welded.

[0024] Alternatively, a miniature water pump can be used as the water spray drive. Its advantages are: better water atomization effect; its disadvantages are: it requires a power supply and greatly increases the weight of the equipment.

[0025] In addition, another dust removal solution is provided, wherein the dust cover has multiple water spray holes. By using a water sprayer, the nozzle is inserted into the water spray holes to spray water into the dust cover cavity to remove dust, which can also achieve the dust removal effect. Compared with the above solution, its advantage is that the structure is simple; the disadvantage is that the multiple water spray holes result in poor sealing effect of the dust cover. The appropriate dust removal method should be selected according to the actual situation.

[0026] The triggering mechanism includes a heating plate, a lever, a rod groove, a pressure rod, a support spring, and a socket. The upper end of the sealing mechanism has the socket. The heating plate is fixedly installed above the sealing mechanism. The baffle is fixedly installed 10-15cm away from both sides of the heating plate. When the distance is less than 10cm, the distance between the baffle and the heating plate is too close, causing water droplets on the baffle to splash and affect the dryness of the pipe surface to be melted. When the distance is greater than 15cm, the water droplets condensed on the baffle cannot flow to both sides and fall down from both sides along the arched bottom. The side of the transparent plastic plate has the rod groove. The depth of the rod groove is set to 2-3cm. If the depth is less than 2cm, the pressure rod may jump out. If the depth is greater than 3cm, it may cause inconvenience. The pressure rod is slidably installed in the rod groove. One end of the support spring is fixedly installed at the lower end of the pressure rod. The other end of the pressure rod is fixedly installed with the lever. The lever is V-shaped. The V-shaped lever has strong stability and can simultaneously trigger the auxiliary welding mechanisms on both sides.

[0027] Preferably, the pipe surface cleaning assembly includes two guide rails symmetrically arranged at the bottom of the dust cover. Each end of the two guide rails is fixedly equipped with a support spring. The other end of the four support springs is fixedly equipped with a slider. The four sliders are rotatably connected to connecting rods. The other end of the four connecting rods is rotatably connected to a wiping plate. A clean cloth is wrapped on the wiping plate. When the slider slides along the guide rail, the wiping plate moves along a defined trajectory. A break is provided at the intersection of the guide rail and the wiping plate's movement trajectory.

[0028] Its working principle is as follows: When the heating plate is inserted into the socket, its lower end contacts and presses down on the wiping plate. The heating plate moves downward, causing the wiping plate to move downward as well. The wiping plate compresses the support spring through the connecting rod. The support spring provides upward resistance to the wiping plate, but because the downward force provided by the heating plate is greater than the upward force provided by the support spring, the wiping plate continues to move downward. When the connecting rod is horizontal, the support spring reaches its maximum compression. After the heating plate is placed on the fixed rod, it no longer provides downward force to the wiping plate, and the connecting rod moves around the slider as its axis. When the point tilts downwards, the support spring recovers part of its length, but remains compressed. The support spring provides a downward component force to the cleaning plate through the connecting rod. The wiping plate continues to move downwards along the break, and thus, the wiping plate no longer contacts the heating plate until it is pressed against the bottom of the dust cover cavity. After removing the heating plate, the wiping plate is still pressed against the bottom of the dust cover cavity by the downward component force provided by the support spring. The next time the wiping plate is used, it is pulled upwards until the support spring changes its force on the wiping plate to upwards. The wiping plate then returns to its original position under the elastic force of the support spring.

[0029] By setting a break, a second stroke is provided for the wiping plate, so that after the wiping plate passes the break, the direction of force on the wiping plate is reversed, and the support spring has a locking function.

[0030] This design utilizes the insertion of the heating plate to drive a wiping plate to clean the surface of the pipe to be fused, thus preventing dust contamination of the joint surface and ensuring sufficient fusion at the weld joint, thereby avoiding defects in the weld joint. Simultaneously, a support spring separates the wiping plate from the heating plate, preventing the clean cloth on the wiping plate from contacting the heating plate and burning it, which would reduce the cleaning effect. Furthermore, it prevents the wiping plate from rapidly lifting after removing the heating plate, which could damage the molten flange of the pipe and lead to weld failure.

[0031] Preferably, a lever is movably installed at the bottom of the dust cover cavity, the dust cover has a rod groove, a pressure rod is movably installed in the rod groove, the pressure rod is L-shaped, one end of the lever is located directly below the wiping plate, the other end of the lever is located below the pressure rod, a support spring is fixedly installed at the lower end of the turning point of the pressure rod, the other end of the support spring is fixedly installed at the bottom end of the rod groove, and the lever is V-shaped.

[0032] It should be noted that the dust cover is divided into an upper cover and a lower cover, and the width of the opening at the lower end of the rod groove is greater than the width at the upper end of the rod groove.

[0033] The principle is as follows: During the closing process of the dust cover, the upper cover body presses down the lever, compressing the support spring. The lever moves downward along the groove, pressing down one end of the lever, while the other end of the lever lifts the wiping plate. The force exerted by the lever on the wiping plate is greater than the downward component of the force exerted by the support spring on the wiping plate, causing the wiping plate to move upward and compressing the support spring. As the wiping plate continues to move upward, the support spring reaches its maximum compression when the connecting rod is horizontal. As the wiping plate continues to move upward, the connecting rod tilts upward around the slider as the origin, the support spring returns to its original position, and the support spring provides an upward force on the wiping plate through the connecting rod, causing the wiping plate to continue moving upward until it returns to its original position. After the heating plate is inserted, when the wiping plate presses the lever, one end of the lever is lifted. However, at this time, the pressure rod cannot move upward because it is pressed down by the upper cover. But because the width of the opening at the lower end of the rod groove is greater than the width of the pressure rod, the pressure rod has the freedom to rotate around the vertical direction. When one end of the lever moves upward, the lever pushes the pressure rod away from the lever, thus preventing the pressure rod from continuously pressing down on the lever and affecting the downward movement of the wiping plate. When the dust cover is opened, the upper cover no longer provides pressure to the pressure rod, and the pressure rod moves upward along the rod groove under the elastic force of the support spring.

[0034] Since the lever needs to apply pressure to the same side, the V-shaped lever design effectively reduces the pressure depth of the pressure plate, thus saving space and reducing manufacturing costs. Another advantage of the V-shaped lever is that it provides sufficient rigidity to better accommodate unbalanced stresses between the lever and the wiping plate, thereby improving the reliability and service life of the equipment.

[0035] This design allows the wiping plate to automatically return to its original position when the worker closes the dust cover. It prevents the wiping plate from being at the bottom of the enclosed space when water mist is sprayed, which would cause the water mist to wet the clean cloth on the wiping plate. This would prevent the wiping plate from wetting the pipe surface when cleaning the pipe to be fused, thus avoiding poor heat fusion and defects in the weld.

[0036] Preferably, the wiping plate is made of foam material, and the connecting rod at the lower end of the cleaning plate is made of aluminum plate.

[0037] This design reduces the weight of the wiping plate, preventing it from becoming too heavy and causing the support spring to be unable to support the plate at the proper height. This would prevent the wiping plate from cleaning the upper part of the tube surface, thus avoiding incomplete cleaning and defects at the weld joint. Furthermore, the design using foam at the top and aluminum plate at the bottom lowers the center of gravity of the wiping plate, reducing the risk of tilting and ensuring a smooth resetting process, preventing jamming during resetting.

[0038] Preferably, sponge pads are fixedly installed on the arc sides of the dust cover. The deformation of the sponge pads fills the gap between the dust cover and the pipe to be melted, improving the sealing effect of the dust cover. When the dust cover is closed without the pipe to be melted, the two sponge pads close, preventing dust from being blown into the dust cover when the equipment is not in use.

[0039] In addition, the sponge pad has the following advantages: 1. The sponge pad is moistened by the water mist from the sandblasting of the dust removal mechanism, which can absorb dust floating inside the dust cover, improving the dust removal speed and its own sealing effect; 2. The sponge pad has excellent resilience. This property allows the dust cover to automatically return to its original shape and close the holes on the dust cover used to hold the polyethylene pipe when the welded high-strength polyethylene pipe is removed from the equipment. This reduces the amount of dust entering the dust cover when the welding equipment is idle or moved, thus reducing the cleanliness of the sealed space and ensuring the welding quality.

[0040] Preferably, an upward-opening cover is rotatably mounted above the insertion port, and an upward-opening small plate is rotatably mounted on the cover. When the heating plate is not inserted, both the cover and the small plate are closed; after the heating plate is inserted, the cover closes and the small plate opens, allowing the heating plate to extend. By designing the cover to open upwards, workers can directly remove the heating plate after heating without first opening the cover. This reduces the open time of the sealed space when removing the heating plate, preventing dust from blowing into the insertion port, thus ensuring a good seal and consequently guaranteeing the welding quality.

[0041] The beneficial effects of this invention are as follows:

[0042] 1. This invention provides a clean, sealed space for the welding process by setting up an auxiliary welding mechanism to ensure welding quality. To this end, a sealed space is provided for the cleaning and welding processes of the pipe joint to be welded, isolating it from external dust and sand. Water mist is then used to adhere and clean the dust within this sealed space, limiting the water mist spray range to prevent it from spraying onto the pipe surface. This ensures that the pipe surface remains dry while cleaning the dust within the sealed space, providing a clean environment for pipe welding. This prevents gaps during the welding process, ensuring a close fit at the weld joint and avoiding defects, thus guaranteeing welding quality.

[0043] 2. This invention solves the problem of external dust and impurities entering the welding area and affecting welding quality when workers need to reach close to the surface of the HDPE pipe to be welded for cleaning, thus opening the sealed space. The dust cover provides an extra layer of protection, and the insertion of the heating plate simultaneously cleans the surface of the heating plate and the pipe opening to be welded, avoiding the risk of opening the dust cover for cleaning. This ensures the cleanliness of the sealed space and the high purity of the welding environment, thereby further improving the welding quality of this high-strength polyethylene pipe.

[0044] 3. This invention incorporates a triggering mechanism to prevent issues after the heating plate is removed from affecting the welding of the high-strength polyethylene (HDPE) pipes. By setting the travel distance of the cleaning component, its movement to a designated position reverses the force direction on the cleaning component, thereby altering the effect of the reset element on the cleaning component and achieving both reset and locking functions. This prevents the cleaning component from rapidly resetting after the heating plate is removed, placing it between the two HDPE pipes, which would prevent the heated HDPE pipes from being joined and thus cause welding failure. Therefore, this invention avoids the device affecting the welding of the HDPE pipes. Attached Figure Description

[0045] The above and other aspects of the invention will now be described by way of example only, with reference to the accompanying drawings, in which:

[0046] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0047] Figure 2 for Figure 1 Enlarged view of section A;

[0048] Figure 3 for Figure 1 A partial cross-sectional top view;

[0049] Figure 4 for Figure 3 Enlarged view of section F in the middle;

[0050] Figure 5 for Figure 3 A cross-sectional view of the CC tube to be melted and removed from the tube;

[0051] Figure 6 for Figure 5 Enlarged view of section G in the middle;

[0052] Figure 7 for Figure 3 Cross-sectional view of DD in the middle;

[0053] Figure 8 for Figure 5 Another state diagram;

[0054] Figure 9 This is a structural diagram of the pipe surface cleaning unit;

[0055] Figure 10 for Figure 8 Enlarged view of section H in the middle;

[0056] Figure 11 for Figure 3 Cross-sectional view of the EE;

[0057] Figure 12 for Figure 8 Enlarged view of section I.

[0058] In the diagram: 1. Welding frame; 2. Fixing rod; 3. Pipe clamp; 4. Handle; 5. Pipe to be melted; 6. Water tank; 7. Auxiliary welding mechanism; 71. Cleaning plate; 72. Cleaning tank; 73. Return spring; 74. Locking pin; 75. Pin groove; 76. Card slot; 77. Cleaning assembly; 771. Wiping plate; 772. Guide rail; 773. Support spring; 774. Slider; 775. Connecting rod; 776. Rubber ring; 8. Sealing mechanism; 81. Dust cover; 82. Water supply pipe; 83. Water mist nozzle; 84. Baffle; 85. Housing; 86. Cover plate; 87. Transparent plastic plate; 88. Sponge pad; 9. Triggering mechanism; 91. Heating plate; 92. Lever; 93. Rod groove; 94. Pressure rod; 95. Support spring; 96. Socket. Detailed Implementation

[0059] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0060] like Figures 1 to 12 As shown, it should be noted that the fusion-welded HDPE pipe has an outer diameter of 200mm, a wall thickness of 11.9mm, and was installed in an environment with a wind speed of 3 to 4, and there was a significant amount of dust at the construction site.

[0061] This invention provides a high-strength polyethylene pipe welding device, comprising a welding frame 1, fixing rods 2, pipe clamps 3, handles 4, a pipe to be welded 5, a water tank 6, an auxiliary welding mechanism 7, a sealing mechanism 8, and a triggering mechanism 9. Two fixing rods 2 are symmetrically installed on the welding frame 1, and multiple pipe clamps 3 are slidably installed on the two fixing rods 2. The pipe clamps 3 are used to fix the pipe to be welded 5, and one of the pipe clamps 3 is fixedly installed with the handle 4. The sealing mechanism 8 is fixedly installed on the inner side of the pipe clamp 3, and the water tank 6 is fixedly installed on the sealing mechanism 8. When the cover is closed, the sealing mechanism 8 uses an elastic element in conjunction with the rods to automatically reset the auxiliary welding mechanism 7. The auxiliary welding mechanism 7 is fixedly installed inside the sealing mechanism 8. Under the auxiliary water spray dust suppression effect of the water tank 6, the auxiliary welding mechanism 7 is driven by the triggering mechanism 9 to push and scrape away dust. The triggering mechanism 9 is fixedly installed in the sealing mechanism 8. The triggering mechanism 9 uses the downward insertion force during the necessary heating stage in the welding process to drive the operation of other mechanisms.

[0062] During operation, the dust cover 81 isolates the welding process from the outside environment. The dust removal mechanism cleans the dust in the enclosed space. As the heating plate 91 is inserted into the socket 96 on the dust cover 81, the plate surface cleaning units on both sides of the socket 96 clean the plate surfaces on both sides of the heating plate 91. With the power of the insertion of the heating plate 91, the pipe surface auxiliary welding mechanism 7 moves downward. During the downward movement of the pipe surface auxiliary welding mechanism 7, the pipe surface of the pipe to be welded 5 is cleaned. The dust cover 81 forms a sealed space for the HDPE pipe welding process, preventing wind-blown dust from contaminating the pipe surface of the pipe to be welded 5. The dust removal mechanism cleans the dust in the enclosed space, providing a clean environment for subsequent cleaning of the heating plate 91 and the pipe surface. Then, the auxiliary welding mechanism 7 cleans the heating plate 91 and the welding surface, thereby avoiding dust contamination of the joint surface of the pipe to be welded 5 in windy and dusty environments, which could lead to insufficient fusion at the weld and thus prevent defects in the welding of the pipe to be welded 5.

[0063] like Figure 2 and Figure 3As shown, the auxiliary welding mechanism 7 includes a cleaning plate 71, a cleaning groove 72, a return spring 73, a locking pin 74, a pin groove 75, a slot 76, and a cleaning assembly 77. The cleaning plate 71 is slidably installed below the sealing mechanism 8. The cleaning groove 72 is opened above the cleaning plate 71, and the locking pin 74 is slidably installed on the cleaning groove 72. The rotation angle of the locking pin 74 is set to 60°-120°. If the rotation angle of the locking pin 74 is less than 60°, its cleaning working area will be incomplete, and some four feet will not be completely cleaned. In the long-term use, this may lead to problems such as poor welding quality and reduced work efficiency. When its rotation angle is greater than 120°, it will generate a large impact force on the cleaning groove 72, which is not conducive to the long-term operation of the auxiliary welding mechanism 7. Stability during repeated operation; one end of the locking pin 74 is fixedly installed on one end of the return spring 73, and the other end of the return spring 73 is fixedly installed on the side of the cleaning groove 72. The length of the return spring 73 is set to 10cm. When the length of the return spring 73 is less than 8cm, its buffer area is small and cannot achieve the reset function of the locking pin 74. When the length of the return spring 73 is greater than 12cm, its reset effect is poor, the structure is loose during movement, and it is not conducive to quick and stable reset work; the locking mechanism is provided with the pin groove 75, which is located around the locking pin 74. The slot 76 is opened next to the pin groove 75. The cleaning component 77 is fixedly installed on the lower part of the sealing mechanism 8.

[0064] During operation, after the heating plate 91 is fully inserted: pulling the locking pin 74 causes the cleaning plate 71 to be fully retracted into the cleaning groove 72. At the same time, the return spring 73 is compressed, and the locking pin 74 moves along the pin groove 75 to the end point. At this time, the heating plate 91 no longer provides pressure to the cleaning plate 71. However, since the pin groove 75 forms an angle with the spring force direction of the return spring 73 in the horizontal direction, the locking pin 74 rotates into the slot 76 on the pin groove 75 under the spring force of the return spring 73. The locking pin 74 cannot return to the pin groove 75. Therefore, the locking pin 74 prevents the cleaning plate 71 from popping out under the spring force of the return spring 73, thereby preventing the cleaning cloth on the cleaning plate 71 from being burned after contacting the heating plate 91 during the heating process, thus ensuring the cleaning effect of the cleaning cloth in the next cleaning.

[0065] like Figure 4 and Figure 5As shown, the cleaning assembly 77 includes a wiping plate 771, a guide rail 772, a support spring 773, a slider 774, a connecting rod 775, and a rubber ring 776. The wiping plate 771 is fixedly installed at the lower center of the sealing mechanism 8. The guide rail 772 is fixedly installed on the wiping plate 771. A break is provided at the intersection of the movement trajectory of the guide rail 772 and the wiping plate 771. One end of the support spring 73 is fixedly installed inside the sealing mechanism 8. The other end of the support spring 773 is fixedly installed with one end of the connecting rod 775. The other end of the connecting rod 775 is movably installed below the wiping plate 771. The wiping plate 771 has a linear array of rubber rings 776, which are set at an angle of 50°. When the angle of the rubber rings 776 is less than 45°, the friction force they provide is small, making the fixing effect not stable enough. When the angle is greater than 60°, the friction force is large, which is not conducive to the operation of the cleaning component 77. It is necessary to overcome the large friction force, which brings unnecessary safety hazards. The number of rubber rings 776 is set to 4-8. If the number is less than 4, the fixing effect is unstable. If the number is greater than 8, the distance between adjacent rubber rings 776 is too small, which is not conducive to the operation of the cleaning component 77.

[0066] During operation, the lower end of the heating plate 91 contacts and presses down on the wiping plate 771. The heating plate 91 moves downward, causing the wiping plate 771 to move downward as well. The wiping plate 771 compresses the support spring 773 via the connecting rod 775. The support spring 773 provides upward resistance to the wiping plate 771. However, since the downward force provided by the heating plate 91 to the wiping plate 771 is greater than the upward force provided by the support spring 773 to the wiping plate 771, the wiping plate 771 continues to move downward. When the connecting rod 775 is horizontal, the support spring 773 reaches its maximum compression. After the heating plate 91 is placed on the smooth rod...

[0067] At this point, the heating plate 91 no longer provides downward force to the wiping plate 771. The connecting rod 775 tilts downward with the slider 774 as the origin. The support spring 773 recovers part of its length, but the support spring 773 is still in a compressed state. The support spring 773 provides a downward component force to the wiping plate 771 through the connecting rod 775. The wiping plate 771 continues to move downward along the break. As a result, the wiping plate 771 no longer contacts the heating plate 91 until the wiping plate 771 is pressed against the bottom of the dust cover 81, preventing the cleaning cloth on the wiping plate 771 from contacting the heating plate 91, which would cause the cleaning cloth to burn and thus reduce the cleaning effect of the cleaning cloth.

[0068] A scouring pad is fixedly installed on the wiping plate 771. Stabilizing protrusions are formed around the slider 774, and the surface of the stabilizing protrusions is coated. This coating enhances the wear resistance of the slider 774, improves its sliding stability, and extends its service life. An oblique triangular groove is formed on the rubber ring 776, with an oblique angle of 60°. This 60° angle facilitates the engagement of the rubber ring 776. The spacing between adjacent grooves is set to 1-2 cm. A spacing less than 1 cm results in greater friction from the grooves, which is detrimental to movement stability; a spacing greater than 2 cm does not provide sufficient stability. Preferably, the cleaning plate 71 is fitted with multiple rubber rings 776 for securing the cleaning cloth, and the rubber rings 776 are arranged at a 50° angle on the cleaning plate 71. When the cleaning cloth on the cleaning plate 71 cleans the heating plate 91 and the pipe 5 to be melted, the frictional force is relatively large, causing the cleaning cloth wrapped on the cleaning plate 71 to loosen. With this design, the rubber rings 776 are fitted onto the cleaning cloth, and the elasticity of the rubber rings 776 secures the cleaning cloth to the cleaning plate 71. If this solution is not adopted, such as using spring sheets to clamp the cleaning cloth to the cleaning plate 71, the same securing effect can be achieved. However, the spring sheets are relatively hard, and when the cleaning plate 71 slides up and down for cleaning, the spring sheets will scratch the surface of the pipe 5 to be melted. Therefore, during welding, the scratched areas will cause defects in the welding process. If ropes are used to bind the cleaning cloth, the binding time is long. The rubber rings 776 are relatively soft and undergo elastic deformation under force, without damaging the surface of the pipe 5 to be melted.

[0069] Due to the elasticity of the rubber ring 776, the rubber ring 776 tends to shrink to its minimum diameter, causing the rubber ring 776 to be vertical. When the cleaning plate 71 cleans, it moves vertically, so the part of the pipe 5 to be fused that overlaps with the movement path of the rubber ring 776 only contacts the rubber ring 776. This results in poor cleaning effect on the contact surface of this part, causing insufficient fusion in this part of the weld, which in turn produces crack defects. This helps to avoid defects in the weld of the pipe 5 to be fused. The larger the angle of inclination of the rubber ring 776 to the vertical direction, the smaller the impact of the rubber ring 776 on the clean cloth. However, the larger the inclination angle, the greater the force required for the worker to pull the rubber ring 776 when installing the clean cloth. Therefore, a middle value is taken, and the rubber ring 776 is arranged at an angle of 50° to the vertical direction so that the pipe 5 to be fused can always be in contact with the clean cloth, thereby avoiding insufficient fusion and subsequent crack defects, and thus avoiding defects in the fusion of the pipe 5 to be fused. The cleaning component 77 includes the cleaning groove 72 with the slots on both sides of the insertion port 96 arranged facing each other. A plurality of the return springs 73 are uniformly fixedly installed in the cleaning groove 72. The cleaning plate 71 is fixedly installed at the other end of the return spring 73. When the return spring 73 is in the natural state, the cleaning plate 71 extends out from the slot of the cleaning groove 72.

[0070] During operation, before the heating plate 91 is inserted, the return spring 73 is in its normal state, and the cleaning plate 71 extends from the opening of the cleaning groove 72. When the heating plate 91 is inserted, the heating plate 91 and the cleaning plate 71 move relative to each other, and the cleaning plate 71 in the cleaning groove 72 cleans the surface of the heating plate 91. This prevents the heating plate 91 from being covered with dust before use, which could lead to dust at the welding point during heating, thus preventing defects in the welding of the pipe 5 to be welded. A locking pin 74 is fixedly installed at one end of the cleaning plate 71 connected to the return spring 73. The dust cover 81 has symmetrically opened pin grooves 75, and a retaining groove 76 is provided at the end of each pin groove 75. The pin groove 75 connects to the cleaning groove 72, and the horizontal direction of the pin groove 75 forms an angle with the direction of the spring force of the return spring 73. The retaining groove 76 is in the same direction as the spring force of the return spring 73.

[0071] With this design, the heating plate 91 compresses the cleaning plate 71 completely into the cleaning groove 72, while the return spring 73 is compressed. The locking pin 74 moves along the pin groove 75 to its end point. At this point, the heating plate 91 no longer applies pressure to the cleaning plate 71. However, because the horizontal direction of the pin groove 75 forms an angle with the direction of the return spring 73's force, the locking pin 74, under the force of the return spring 73, rotates into the slot 76 on the pin groove 75. The locking pin 74 cannot return to the pin groove 75, thus preventing the cleaning plate 71 from popping out under the force of the return spring 73. This prevents the cleaning cloth on the cleaning plate 71 from being burned after contact with the heating plate 91 during welding and removal, ensuring the cleaning effect of the cleaning cloth in the next cleaning cycle.

[0072] like Figure 5 , Figure 6 and Figure 7As shown, the sealing mechanism 8 includes a dust cover 81, a water supply pipe 82, a water mist nozzle 83, a baffle 84, a housing 85, a cover plate 86, a transparent plastic plate 87, and a sponge pad 88. The housing 85 is fixedly installed on the welding frame 1, and the dust cover 81 is movably installed on the housing 85. The edges of the dust cover 81 are rounded, with a radius of 2.5cm. A radius less than 2cm would result in a sharp edge that could easily damage operators and other mechanisms, while a radius greater than 3cm would make it too smooth and difficult to operate. The water supply pipe 82 is fixedly installed below the water tank 6, and the water mist nozzle 83 is located below the water supply pipe 82. A baffle 84 is provided between each of the two water mist nozzles 83 and the triggering component. The bottom of the baffle 84 is arched, which facilitates the dripping of water droplets. A transparent plastic plate 87 is provided on the side of the dust cover 81 near the handle 4. The cover plate 86 is fixedly installed on the top of the dust cover 81. The sponge pad 88 is fixedly installed around the dust cover 81. The thickness of the sponge pad 88 is set to 4cm. When the thickness of the sponge pad 88 is less than 3cm, its sealing effect is poor. When the thickness of the sponge pad 88 is greater than 5cm, although the sealing effect is better, it may cause blockage and jamming during the operation of the sealing mechanism 8.

[0073] It should be noted that during HDPE pipe welding, the surfaces of the five sections to be welded must be kept clean and dry to ensure a good weld. To prevent welding failure due to water droplets or other impurities, a baffle 84 can be installed below the pipe opening. However, in actual operation, because workers need to remove the heating plate 91, the pipe is moved to separate it from the heating plate 91. This may cause water droplets condensed on the baffle 84 to fall onto the surface of the section to be welded, resulting in a wet and cooled surface and a decrease in weld quality. Considering that workers typically move the welded pipe 40mm when removing the heating plate 91, and the baffle 84 is at least 50mm away from the spigot 96, care should be taken when setting up the water mist spraying device of the dust removal mechanism to prevent the baffle 84 from being too close to the water mist nozzle 83, so as not to affect the water mist spraying range and dust removal effect. Taking all factors into consideration, it is recommended that the distance between the baffle 84 and the socket 96 be set at 60mm. This ensures dust removal while preventing water droplets from falling on the pipe surface even when workers move the pipe to be welded, thus ensuring the quality of the weld.

[0074] During operation, pressing the water spray switch causes the water mist nozzle 83 at the top of the dust cover 81 to spray water mist. The water mist adheres to the dust inside the chamber, cleaning it. By setting baffles 84, two baffles 84 prevent the nearest water mist nozzle 83 from spraying water mist onto the surface of the pipe to be melted 5, thus ensuring that the surface of the pipe to be melted 5 is dry while cleaning the dust inside the chamber, providing a clean environment for subsequent cleaning of the heating plate 91 and the pipe surface.

[0075] It should be noted that, to prevent water droplets on the baffle 84 from splashing onto the surface of the pipe to be welded 5 and affecting the welding quality, the bottom of the baffle 84 is designed in an arch shape. This allows the water droplets condensing on the baffle 84 to flow to both sides and fall down along the arched bottom, thus preventing water droplets from splashing and affecting the dryness of the surface of the pipe to be welded 5. Alternatively, a micro water pump can be used as the water spray drive, which has the advantages of better water atomization; however, it requires a power supply and significantly increases the weight of the equipment. Another dust removal solution is provided: the dust cover 81 has multiple water spray holes. By using a water sprayer, the nozzle is inserted into the water spray holes to spray water into the cavity of the dust cover 81 to remove dust, achieving the same dust removal effect. Compared with the above solution, its advantages are simpler structure; however, the disadvantage is that multiple water spray holes result in poor sealing of the dust cover 81. The appropriate dust removal method should be selected according to the actual situation.

[0076] like Figure 8 , Figure 9 and Figure 10As shown, the triggering mechanism 9 includes a heating plate 91, a lever 92, a rod groove 93, a pressure rod 94, a support spring 95, and a socket 96. The upper end face of the sealing mechanism 8 has the socket 96. The heating plate 91 is fixedly installed above the sealing mechanism 8. The baffle 84 is fixedly installed 10-15cm away from both sides of the heating plate 91. When the distance is less than 10cm, the distance between the baffle 84 and the heating plate 91 is too close, causing water droplets on the baffle 84 to splash and affect the dryness of the surface of the pipe 5 to be melted. When the distance is greater than 15cm, the water droplets condensed on the baffle 84 cannot flow to both sides and fall down from both sides along the arched bottom. The side of the transparent plastic plate 87 has the rod groove 93. The depth of the rod groove 93 is set to 2-3cm. If the depth is less than 2cm, the pressure rod 94 is prone to jumping out. If the depth is greater than 3cm, it is easy to cause inconvenience in movement. The pressure rod 94 is slidably installed. In the rod groove 93, one end of the support spring 95 is fixedly installed at the lower end of the pressure rod 94, and the other end of the pressure rod 94 is fixedly installed with the lever 92. The lever 92 is set in a V-shape. The V-shaped lever 92 has strong stability and can simultaneously trigger the auxiliary welding mechanisms 7 on both sides. The pipe surface cleaning assembly 77 includes two guide rails 772 symmetrically arranged at the bottom of the dust cover 81. Support springs 773 are fixedly installed at both ends of the two guide rails 772. Slider 774 is fixedly installed at the other end of the four support springs 773. Connecting rods 775 are rotatably installed on the four sliders 774. The other ends of the four connecting rods 775 are rotatably connected to a wiping plate 771. A clean cloth is wrapped on the wiping plate 771. When the slider 774 slides along the guide rail 772, the wiping plate 771 moves along a certain trajectory. A break is provided at the intersection of the guide rail 772 and the movement trajectory of the wiping plate 771.

[0077] During operation, when the heating plate 91 is inserted into the socket 96, the lower end of the heating plate 91 contacts and presses down on the wiping plate 771. The heating plate 91 moves downward, causing the wiping plate 771 to move downward as well. The wiping plate 771 compresses the support spring 773 via the connecting rod 775. The support spring 773 provides upward resistance to the wiping plate 771. However, because the downward force provided by the heating plate 91 to the wiping plate 771 is greater than the upward force provided by the support spring 773, the wiping plate 771 continues to move downward. When the connecting rod 775 is horizontal, the support spring 773 reaches its maximum compression. After the heating plate 91 is placed on the fixed rod 2, it no longer provides downward force to the wiping plate 771. The connecting rod 775 tilts downward about the slider 774 as the origin, and the support spring 773 recovers part of its length, but the support spring 773 still... In the compressed state, the support spring 773 provides a downward component force to the cleaning plate 71 through the connecting rod 775. The wiping plate 771 continues to move downward along the break, so the wiping plate 771 no longer contacts the heating plate 91 until the wiping plate 771 is pressed against the bottom of the dust cover 81 cavity. After the heating plate 91 is removed, the wiping plate 771 is still pressed against the bottom of the dust cover 81 cavity by the downward component force provided by the support spring 773. The next time the wiping plate 771 is used, the wiping plate 771 is pulled up until the force of the support spring 773 on the wiping plate 771 changes to an upward force. The wiping plate 771 returns to its original position under the elastic force of the support spring 773. By setting the break, a second stroke of the wiping plate 771 is provided, so that after the wiping plate 771 passes through the break, the force direction of the wiping plate 771 is reversed, so that the support spring 773 has a locking function.

[0078] This design allows the insertion of the heating plate 91 to drive the wiping plate 771 to clean the surface of the pipe 5 to be fused, thereby cleaning the surface of the pipe 5 to be fused and preventing dust from contaminating the joint surface of the pipe 5 to be fused, which could lead to insufficient fusion at the weld joint and thus prevent defects in the weld joint of the pipe 5 to be fused. Meanwhile, a support spring 773 is used to separate the wiping plate 771 from the heating plate 91, preventing the clean cloth on the wiping plate 771 from contacting the heating plate 91, which could burn the clean cloth and reduce its cleaning effect. Also, it prevents the wiping plate 771 from lifting rapidly after the heating plate 91 is removed, which could damage the molten flange of the connecting pipe 5 to be melted, leading to welding failure. A lever 92 is movably installed at the bottom of the dust cover 81 cavity. The dust cover 81 has a rod groove 93, and a pressure rod 94 is movably installed in the rod groove 93. The pressure rod 94 is L-shaped. One end of the lever 92 is located directly below the wiping plate 771, and the other end is located below the pressure rod 94. A support spring 95 is fixedly installed at the lower end of the turning point of the pressure rod 94, and the other end of the support spring 95 is fixedly installed at the bottom of the rod groove 93. The lever 92 is V-shaped.

[0079] It should be noted that the width of the lower opening of the groove 93 is greater than the width of the upper opening of the groove 93. The principle is as follows: During the closing process of the dust cover 81, the upper cover presses down the pressure rod 94, compressing the support spring 95. The pressure rod 94 moves downward along the groove 93, pressing down one end of the lever 92. The other end of the lever 92 lifts the wiping plate 771. The upward force provided by the lever 92 on the wiping plate 771 is greater than the downward component of the force provided by the support spring 773 on the wiping plate 771, causing the wiping plate 771 to move upward and the support spring 773 to compress. The wiping plate 771 continues to move upward. When the connecting rod 775 is horizontal, the support spring 773 reaches its maximum compression. The wiping plate 771 continues to move upward. The connecting rod 775 tilts upward with the slider 774 as the origin, and the support spring 773 returns to its original position. The support spring 773 provides an upward force to the wiping plate 771 through the connecting rod 775, and the wiping plate 771 continues to move upward until the wiping plate 771 returns to its original position. After the heating plate 91 is inserted, when the wiping plate 771 presses the lever 92, one end of the lever 92 is lifted. However, at this time, the pressure rod 94 is pressed down by the upper cover and cannot move upward. But since the width of the opening at the lower end of the rod groove 93 is greater than the width of the pressure rod 94, the pressure rod 94 has the freedom to rotate around the vertical direction. When one end of the lever 92 moves upward, the lever 92 pushes the pressure rod 94 away from the lever 92, thereby preventing the pressure rod 94 from continuously pressing down on the lever 92 and affecting the downward movement of the wiping plate 771. When the dust cover 81 is opened, the upper cover no longer provides pressure to the pressure rod 94, and the pressure rod 94 moves upward along the rod groove 93 under the elastic force of the support spring 95.

[0080] like Figure 12 As shown, since lever 92 needs to apply pressure to the same side, the design of using a V-shaped lever 92 can effectively reduce the pressing depth of the pressure plate, thereby saving space and reducing manufacturing costs. Another advantage of the V-shaped lever 92 is that it provides sufficient rigidity to better accommodate the unbalanced stress between lever 92 and wiping plate 771, thereby improving the reliability and service life of the equipment.

[0081] This design allows the wiping plate 771 to automatically return to its original position when the worker closes the dust cover 81. It avoids the wiping plate 771 being at the bottom of the enclosed space during water mist spraying, preventing the water mist from wetting the clean cloth on the wiping plate 771. This would cause the wiping plate 771 to wet the pipe surface of the pipe to be welded 5, resulting in poor heat fusion and weld defects. The wiping plate 771 is made of foam material, and the lower end of the cleaning plate 71 connecting rod 775 is made of aluminum plate. This reduces the weight of the wiping plate 771, preventing it from being too heavy and causing the support spring 773 to be unable to support the wiping plate 771 to a suitable height, thus preventing the wiping plate 771 from cleaning the upper part of the pipe surface and avoiding incomplete cleaning that could lead to weld defects. Furthermore, the design using foam at the top and aluminum plate at the bottom lowers the center of gravity of the wiping plate 771, reducing the risk of tilting and ensuring a smooth resetting process, avoiding jamming during resetting. Sponge pads 88 are fixedly installed on the arc-shaped sides of the dust cover 81. The deformation of the sponge pads 88 fills the gap between the dust cover 81 and the connecting pipe 5 to be melted, improving the sealing effect of the dust cover 81. When the dust cover 81 is not installed with the connecting pipe 5 and is closed, the two sponge pads 88 are closed, preventing dust from blowing into the dust cover 81 when the equipment is not in use.

[0082] During the work process: Before installation, the worker places the HDPE pipe to be welded on the welding frame 1, leaving a certain distance between the pipe clamp 3 on the fixing rod 2 and the dust cover 81. Then, according to the outer diameter of the pipe, clamps are placed on both sides of the pipe clamp 3 and the dust cover 81 to tighten the pipe clamp 3; after installation, the two pipes to be welded 5 are aligned and the oxide layer at the pipe ends is cut off. After the worker cuts and cleans the chips, the dust cover 81 is closed. During the closing process of the dust cover 81: the pressure rod 94 is pressed down and moves downward along the pressure groove. The pressure rod 94 presses down one end of the lever 92, and the other end of the lever 92, located directly below the wiping plate 771, lifts the wiping plate 771 until the force on the wiping plate 771 changes to upward. Under the elastic force of the support spring 773, the wiping plate 771 returns to its original position. At the same time, the support spring 95 is compressed; the deformation of the sponge fills the gap between the dust cover 81 and the pipe 5 to be welded. After the dust cover 81 is completely closed, the cover plate 86 of the socket 96 and the small plate on the cover plate 86 are covered. The water spray switch is pressed, and the water mist nozzle 83 at the top of the dust cover 81 sprays water mist. The water mist adheres to the dust in the cavity, cleaning the dust in the cavity. The baffle 84 blocks the water sprayed onto the pipe surface of the pipe 5 to be welded, ensuring that the pipe surface of the pipe 5 to be welded is dry. This provides a closed and clean sealed space for HDPE pipe welding.

[0083] Although the beneficial effects of the present invention have been shown in detail and embodiments have been provided in this specification, those skilled in the art can make various changes, modifications, substitutions and alterations to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-strength polyethylene pipe welding device, characterized in that, The assembly includes a welding frame (1), fixing rods (2), pipe clamps (3), handles (4), a pipe to be melted (5), a water tank (6), a cleaning mechanism (7), a dustproof mechanism (8), and a triggering mechanism (9). Two fixing rods (2) are symmetrically installed on the welding frame (1), and multiple pipe clamps (3) are slidably installed on the two fixing rods (2). The pipe clamps (3) are used to fix the pipe to be melted (5), and one of the pipe clamps (3) has a handle (4) fixedly installed on it. The dustproof mechanism (8) is fixedly installed on the inner side of the pipe clamp (3), and the water tank (6) is fixedly installed on the... On the dustproof mechanism (8), when the cover is closed, the dustproof mechanism (8) uses an elastic element and a rod to realize the automatic reset of the cleaning mechanism (7); the cleaning mechanism (7) is fixedly installed inside the dustproof mechanism (8), and the cleaning mechanism (7) is driven by the trigger mechanism (9) to push and scrape to clean the dust under the auxiliary water spraying dust reduction effect of the water tank (6); the trigger mechanism (9) is fixedly installed in the dustproof mechanism (8), and the trigger mechanism (9) uses the force of pressing and inserting during the necessary heating stage in the welding process to drive the cleaning mechanism (7) to operate; The cleaning mechanism (7) includes a cleaning plate (71), a cleaning groove (72), a return spring (73), a locking pin (74), a pin groove (75), a card slot (76), and a cleaning assembly (77). The cleaning plate (71) is slidably installed below the dustproof mechanism (8). The cleaning groove (72) is provided above the cleaning plate (71). The locking pin (74) is slidably installed on the cleaning groove (72). The rotation angle of the locking pin (74) is set to 60°-120°. 4) One end is fixedly installed on one end of the return spring (73), and the other end of the return spring (73) is fixedly installed on the side of the cleaning tank (72). The length of the return spring (73) is set to 8-12cm. The dustproof mechanism (8) is provided with the pin groove (75). The pin groove (75) is located around the locking pin (74). The card slot (76) is opened next to the pin groove (75). The cleaning component (77) is fixedly installed on the lower part of the dustproof mechanism (8). The cleaning assembly (77) includes a wiping plate (771), a guide rail (772), a support spring (773), a slider (774), a connecting rod (775), and a rubber ring (776). The wiping plate (771) is fixedly installed at the lower center of the dustproof mechanism (8). The guide rail (772) is fixedly installed on the wiping plate (771). A break is provided at the intersection of the movement trajectory of the guide rail (772) and the wiping plate (771). The support spring... (773) One end is fixedly installed inside the dustproof mechanism (8), and the other end of the support spring (773) is fixedly installed with one end of the connecting rod (775). The other end of the connecting rod (775) is movably installed below the wiping plate (771). The wiping plate (771) has a linear array of rubber rings (776). The rubber rings (776) are set at an inclination of 45°-60°, and the number of rubber rings (776) is set to 4-8.

2. The high-strength polyethylene pipe welding equipment according to claim 1, characterized in that: A scouring pad is fixedly installed on the wiping plate (771), and stabilizing protrusions are provided around the slider (774). The surface of the stabilizing protrusions is coated. An oblique triangular groove is provided on the rubber ring (776), with an oblique angle of 60° and a spacing of 1-2 cm between adjacent grooves.

3. The high-strength polyethylene pipe welding equipment according to claim 1, characterized in that: The dustproof mechanism (8) includes a dust cover (81), a water supply pipe (82), a water mist nozzle (83), a baffle (84), a housing (85), a cover plate (86), a transparent plastic plate (87), and a sponge pad (88); the housing (85) is fixedly installed on the welding frame (1), and the dust cover (81) is movably installed on the housing (85). The edges of the dust cover (81) are rounded, and the radius of the rounded corners is set to 2-3 cm. The water supply pipe (82) is fixedly installed under the water tank (6). The water mist nozzles (83) are provided below the water supply pipe (82). Baffles (84) are provided between the two water mist nozzles (83) and the triggering mechanism (9). The bottom of the baffles (84) is arched. The transparent plastic plate (87) is provided on the side of the dust cover (81) near the handle (4). The cover plate (86) is fixedly installed on the top of the dust cover (81). The sponge pad (88) is fixedly installed around the dust cover (81). The thickness of the sponge pad (88) is set to 3-5cm.

4. The high-strength polyethylene pipe welding equipment according to claim 3, characterized in that: The triggering mechanism (9) includes a heating plate (91), a lever (92), a rod groove (93), a pressure rod (94), a support spring (95), and a socket (96); the upper end of the dustproof mechanism (8) is provided with the socket (96), the heating plate (91) is fixedly installed above the dustproof mechanism (8), the baffle (84) is fixedly installed 10-15cm on both sides of the heating plate (91), the side of the transparent plastic plate (87) is provided with the rod groove (93), and the depth of the rod groove (93) is set to 2-3cm; the pressure rod (94) is slidably installed in the rod groove (93), one end of the support spring (95) is fixedly installed at the lower end of the pressure rod (94), and the other end of the pressure rod (94) is fixedly installed with the lever (92), and the lever (92) is set in a V shape.

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