High-density polyethylene seamless elbow polyurethane heat-insulating elbow and preparation method thereof

Abstract

This invention discloses a seamless high-density polyethylene bend with polyurethane insulation and its preparation method, relating to the field of bend preparation technology. A pipe forming mold is installed at one end of a fixed extruder. Several supporting and integrating frames are equidistantly arranged inside the isolating forming box, and several transverse integrating frames are also equidistantly arranged inside the isolating forming box. Supporting hydraulic cylinders are symmetrically engaged at the bottom ends of both the supporting and transverse integrating frames. A traction motor is mounted on one end of each supporting and transverse integrating frame via a motor mount. A vertical traction roller is rotatably connected to the inner side of the supporting and integrating frame corresponding to the traction motor position. This invention effectively solves the problem in the prior art where, due to the relatively fixed equipment, the pipe production speed and the degree of gradual bending cannot be adjusted according to the required bending radius and the actual material used in the pipe. This results in wrinkles or unevenness during pipe production due to the fixed angle and speed.

Description

Technical Field

[0001] This invention relates to the field of pipe bending technology, specifically to a high-density polyethylene seamless pipe bending polyurethane insulated elbow and its preparation method. Background Technology

[0002] High-density polyethylene (HDPE) bends refer to pipe elbows made of HDPE material, used to change the direction of pipeline systems. Common angles include 45°, 90°, 11.25°, and 22.5°. Polyurethane insulated elbows are key turning components in direct-buried insulated pipeline systems, mainly used to ensure insulation, waterproofing, and structural stability at pipeline bends. They are widely used in heating, cooling, and industrial pipelines.

[0003] The patent application number CN202320042163.0 mentions "an automated pipeline processing production line". This patent automates the cutting, bending and transfer of pipeline raw materials, eliminating the need for workers to transport the pipeline raw materials to different work sites and perform different processes. It has advantages such as compact structure, concentrated work area, small footprint, fewer personnel and low labor intensity.

[0004] However, during pipe bending production, because the equipment is fixed as a whole, it is impossible to adjust the bending speed and the degree of bending according to the bending radius and the material of the pipe. This makes it easy for wrinkles or uneven thickness of the inner and outer walls to occur during pipe production. At the same time, it is impossible to make quick adjustments according to different pipe angles during production, which greatly affects the speed and quality of pipe production. Summary of the Invention

[0005] This invention provides a high-density polyethylene seamless bend polyurethane insulated elbow and its preparation method. It can effectively solve the problems mentioned in the background art, such as the inability to adjust the bending speed and bending range of the pipe according to the bending radius and the material of the pipe during the production of bend pipes due to the overall fixed equipment. This makes it easy for wrinkles or uneven thickness of the inner and outer walls to occur during pipe production. At the same time, it is impossible to quickly adjust the pipe according to different angles during production, which greatly affects the speed and quality of pipe production.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for preparing a high-density polyethylene seamless bend with polyurethane insulation, comprising the following steps:

[0007] S1. Raw material hot melting: The required material is fed into the feed hopper of a fixed extruder, and the raw material is hot melted using the fixed extruder;

[0008] S2, Extrusion Traction: Polyethylene mixture is extruded through a fixed extruder and pipe forming die and filled and shaped. The pipe is tractioned by a traction motor, vertical traction roller and horizontal traction roller. The inner lining is supported by an inner lining positioning frame, a combined positioning frame and a linkage operation frame to realize extrusion shaping and traction outward discharge.

[0009] S3, Correction and Cooling: Multiple support and horizontal integration frames are rotated sequentially by the shifting motor and the correction motor to form an arc angle. Under the lateral support and restriction of the vertical traction roller and the horizontal traction roller, they are gradually bent and cooled and shaped in conjunction with the warm water spray pipe, the cold water spray pipe and the water pump.

[0010] S4. Cutting and Material Discharge: The cutting position is adjusted according to the position of the bent pipe by correcting the electric slide rail, cutting hydraulic cylinder, cutting operation sleeve and cold cutting motor, and contact cutting is performed. The surface is dried and dehydrated with dehydrating sponge.

[0011] According to the above technical solution, an isolation forming box is provided at one end of the fixed extruder, and a forming guide component is provided at the side end of the isolation forming box;

[0012] According to the above technical solution, the forming guide component includes a pipe forming mold;

[0013] A pipe forming die is installed at one end of the fixed extruder, and several supporting integration frames are equidistantly arranged inside the isolation forming box, and several transverse integration frames are equidistantly arranged inside the isolation forming box.

[0014] The bottom ends of the supporting integrated frame and the horizontal integrated frame are symmetrically engaged with supporting hydraulic cylinders, and the bottom ends of the supporting hydraulic cylinders are equipped with electric casters.

[0015] The inner ends of both the support frame and the transverse frame are equipped with traction motors via motor mounts. A vertical traction roller is rotatably connected to the inner side of the support frame at the position corresponding to the traction motor, and a transverse traction roller is rotatably connected to the inner side of the transverse frame at the position corresponding to the traction motor.

[0016] Both the supporting integrated frame and the horizontal integrated frame have a transposition motor mounted on their bottom ends via motor mounts.

[0017] According to the above technical solution, one end of the pipe forming mold is snapped into the isolation forming box, the side end of the electric universal wheel is attached to the bottom inner side of the isolation forming box, and one end of the vertical traction roller and the horizontal traction roller are snapped into the output shaft of the shifting motor.

[0018] According to the above technical solution, the output shaft of the shifting motor is snapped with a shifting operation frame, and a correction motor is installed on one end of the inner side of the shifting operation frame through a motor mount.

[0019] The inner side of the isolation molding box is provided with several inner lining positioning frames at equal intervals, and the side end of the inner lining positioning frame is welded with a combined positioning frame.

[0020] One end of the combined positioning frame is equipped with a swing motor via a motor mount. The output shaft of the swing motor is snapped with a swing operation plate. One end of the swing operation plate is equipped with an alignment motor via a motor mount at the position corresponding to the inner lining positioning frame.

[0021] A rotary motor is mounted on one end of the inner side of the lining positioning frame via a motor base, and a rotary gear is engaged with the output shaft of the rotary motor.

[0022] The inner lining positioning frame is rotatably connected to a linkage gear, and the side end of the linkage gear is engaged with a linkage operation frame.

[0023] Several outward-pushing electric actuators are equidistantly installed on the side end of the linkage operation frame, and an outward-pushing operation block is installed at one end of each outward-pushing electric actuator.

[0024] According to the above technical solution, a bearing hydraulic cylinder is installed at the middle of the bottom end of the switching operation frame, a bearing positioning plate is installed at the bottom end of the bearing hydraulic cylinder, and a fixing electromagnet is sleeved at the bottom end of the bearing positioning plate.

[0025] The top of the repositioning operation frame is rotatably connected to the bottom of the support integration frame and the transverse integration frame. The output shafts of the multiple correction motors are respectively engaged with the bottom of the support integration frame and the transverse integration frame. The swing operation plate is rotatably mounted on the top of the combined positioning frame.

[0026] According to the above technical solution, one end of the inner lining positioning frame is engaged with one end of the pipe forming mold, the output shaft of the alignment motor is engaged with one end of the inner lining positioning frame, and the rotating gear is meshed with the linkage gear.

[0027] The input ends of the fixed extruder, supporting hydraulic cylinder, electric universal wheel, traction motor, shifting motor, correction motor, swing motor, alignment motor, rotary motor, external push electric push rod, bearing hydraulic cylinder and fixed electromagnet are all electrically connected to the output end of the external controller.

[0028] The input terminal of the external controller is electrically connected to the output terminal of the external power supply.

[0029] According to the above technical solution, a cold forming separation component is provided on the side end of the isolation molding box;

[0030] The cold forming separation component includes a circulating liquid storage tank;

[0031] A circulating liquid storage tank is installed at one end of the isolation molding box, and a circulating processing pipe is connected through the side end of the circulating liquid storage tank.

[0032] A warm water spray pipe runs through one side of the top of the isolation molding box, and a cold water spray pipe runs through the other side of the top of the isolation molding box.

[0033] A water pump is installed on the side of the circulating liquid storage tank at the location of the circulating treatment pipe, the warm water spray pipe and the cold water spray pipe via a motor mount. A water-blocking and collecting rack is welded to one end of the inner side of the isolation molding box.

[0034] The inner side of the isolation molding box is equipped with a correction electric slide rail, and the side end of the correction electric slide rail is equipped with a correction operation frame through a slide rail seat;

[0035] One end of the correction operation frame is embedded with an annular electric slide rail, and a cutting hydraulic cylinder is mounted on the other end of the annular electric slide rail via a slide rail seat.

[0036] According to the above technical solution, a cutting operation sleeve is snapped into the bottom end of the cutting hydraulic cylinder, a cold cutting motor is installed inside the cutting operation sleeve via a motor mount, and a cutting blade is snapped into the output shaft of the cold cutting motor.

[0037] The inner side of the isolation molding box is fitted with a dehydration electric slide rail near the correction electric slide rail position. The side end of the dehydration electric slide rail is connected to a release operation frame via a slide rail seat. A dehydration sponge is installed inside the release operation frame.

[0038] The circulating treatment pipe is installed through the side of the isolation molding box, and one end of the warm water spray pipe is embedded in the inside of the circulating liquid storage tank.

[0039] According to the above technical solution, the correction operation frame is slidably installed inside the isolation molding box, and the longitudinal section of the detachment operation frame is U-shaped;

[0040] The input terminals of the water pump, the corrective electric slide rail, the annular electric slide rail, the cutting hydraulic cylinder, the cold cutting motor, and the dehydration electric slide rail are all electrically connected to the output terminal of the external controller.

[0041] The high-density polyethylene seamless bend with polyurethane insulation produced by the manufacturing method of high-density polyethylene seamless bend with polyurethane insulation.

[0042] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0043] 1. Equipped with a forming guide component, multiple sets of shifting motors drive the shifting operation frame to rotate, which in turn drives the transverse integration frame and the support integration frame to rotate gradually. In conjunction with the correction motor, the transverse integration frame and the support integration frame are rotated to achieve angle correction. This also allows for angle correction between the multiple sets of support integration frames and the transverse integration frame. In conjunction with the swing motor, swing operation plate, and alignment motor, the inner lining positioning frame and the combined positioning frame are rotated to change the angle between the two sets of inner lining positioning frames and the combined positioning frame, achieving internal angle correction. This avoids the situation where the inner wall of the pipe is weak or punctured due to the difference between the inner and outer angles. Thus, the overall angle of the arc-shaped guide component is adjusted, allowing for quick correction of the bending position according to the bending angle of the pipe elbow during production, facilitating the rapid production of elbows with different angles.

[0044] The traction motor drives the vertical traction roller and the horizontal traction roller to rotate and pull the outer end of the pipe, while the edge is corrected. The external push rod drives the external push operation block to move to the inner wall of the pipe. The rotary motor, rotary gear and linkage gear drive the external push operation block to rotate slowly. Through double pressing inside and outside, the shape of the pipe is corrected and the pipe is supported, so as to achieve steady production of the pipe.

[0045] By employing multi-segment connection-type angle correction and internal and external dual correction, combined with internal rotational alignment support and external guiding support, this technology effectively solves the problem in existing technologies where the overall equipment is relatively fixed, making it impossible to adjust the pipe production speed and gradual bending and shaping range according to the required bending range and the actual material used in the pipe. This results in wrinkles or unevenness during pipe production due to the fixed angle and speed. This effectively improves the overall uniformity of pipe production, while timely correction during production reduces downtime, ensures pipe production speed, and improves pipe quality.

[0046] 2. Equipped with a cold forming separation component, the internally stored warm water is circulated through a water pump, warm water spray pipe, circulating storage tank, and circulating treatment pipe. The warm water spray gradually forms and cools the pipe, achieving slow cooling, extending the cooling time, increasing the time for bending correction, ensuring the effectiveness of pipe bending and shape correction, improving the stability of pipe production and the quality during forming. Furthermore, the warm water generated during cooling is recycled to reduce resource waste. Combined with the water pump and cold water spray pipe for low-temperature spray rapid cooling of the pipe, the pipe achieves comprehensive shaping treatment. Through water cooling treatment at different temperatures, the pipe can operate steadily under different conditions, ensuring pipe production efficiency while improving product quality.

[0047] The dehydration electric slide rail moves the detachment operating frame and dehydration sponge to fit the side of the pipe. The dehydration sponge dries and absorbs water from the pipe, achieving surface drying. The correction electric slide rail moves the correction operating frame, the cutting hydraulic cylinder moves the cutting operating sleeve, and the cold cutting motor moves the cutting blade. In conjunction with the annular electric slide rail, the cutting hydraulic cylinder and cutting blade move to achieve annular cutting of the pipe, realizing pipe segmentation and drying. The operation is synchronized, and the waste generated during cutting is intercepted to ensure the stability and safety of the production environment.

[0048] In summary, by combining the forming guide component and the cold forming separation component, and by using the multi-section pipe bending components for mutual adjustment and rapid correction, along with hot and cold two-stage cooling production, the pipe angle can be slowly corrected, and internal and external corrections can be performed to ensure stable pipe production, thereby improving overall production efficiency and product quality. Attached Figure Description

[0049] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0050] In the attached diagram:

[0051] Figure 1 This is a schematic diagram of the method flow of the present invention;

[0052] Figure 2 This is a three-dimensional structural schematic diagram of the present invention;

[0053] Figure 3 This is a schematic diagram of the molding guide assembly of the present invention;

[0054] Figure 4 This is a schematic diagram of the installation structure of the electric caster wheel of the present invention;

[0055] Figure 5 This is a schematic diagram of the installation structure of the horizontal integration frame of the present invention;

[0056] Figure 6 This is a schematic diagram of the mounting structure of the swing operation plate of the present invention;

[0057] Figure 7 This is a schematic diagram of the installation structure of the transposition operation frame of the present invention;

[0058] Figure 8 This is a schematic diagram of the cold forming separation component of the present invention;

[0059] Figure 9 This is a schematic diagram of the installation structure of the warm water spray pipe of the present invention;

[0060] Figure 10This is a schematic diagram of the installation structure of the modified electric slide rail of the present invention;

[0061] The diagram shows: 1. Fixed extruder; 2. Isolation molding box;

[0062] 3. Molding guide assembly; 301. Pipe forming mold; 302. Supporting integrated frame; 303. Lateral integrated frame; 304. Supporting hydraulic cylinder; 305. Electric universal wheel; 306. Traction motor; 307. Vertical traction roller; 308. Lateral traction roller; 309. Positioning motor; 310. Positioning operation frame; 311. Correction motor; 312. Inner liner positioning frame; 313. Combined positioning frame; 314. Swing motor; 315. Swing operation plate; 316. Alignment motor; 317. Rotary motor; 318. Rotary gear; 319. Linkage gear; 320. Linkage operation frame; 321. Outward push electric push rod; 322. Outward push operation block; 323. Bearing hydraulic cylinder; 324. Bearing positioning plate; 325. Fixing electromagnet;

[0063] 4. Cold forming separation assembly; 401. Circulating liquid storage tank; 402. Circulating processing pipe; 403. Warm water spray pipe; 404. Cold water spray pipe; 405. Water pump; 406. Water collection rack; 407. Correction electric slide rail; 408. Correction operating frame; 409. Circular electric slide rail; 410. Cutting hydraulic cylinder; 411. Cutting operating sleeve; 412. Cold cutting motor; 413. Cutting blade; 414. Dehydration electric slide rail; 415. Disengagement operating frame; 416. Dehydration sponge. Detailed Implementation

[0064] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0065] Example: Figure 1-10 As shown, the present invention provides a technical solution for preparing a high-density polyethylene seamless bend polyurethane insulated elbow, comprising the following steps:

[0066] S1. Raw material hot melting: The required material is fed into the feed hopper of the fixed extruder 1 and fed into the fixed extruder 1 through the feed hopper. The fixed extruder 1 is used to perform hot melting treatment on the raw material.

[0067] S2, Extrusion Traction: The polyethylene mixture is extruded through the fixed extruder 1 and the pipe forming die 301 and filled and shaped. The pipe is tractioned by the support frame 302, the transverse frame 303, the traction motor 306, the vertical traction roller 307 and the transverse traction roller 308. The inner lining is supported by the inner lining positioning frame 312, the combined positioning frame 313 and the linkage operation frame 320 to realize extrusion shaping and traction outward discharge.

[0068] S3, Correction and Cooling: The multiple support integration frames 302 and the transverse integration frame 303 are rotated sequentially by the shifting motor 309, the shifting operation frame 310 and the correction motor 311 to form an arc angle. Under the lateral support and restriction of the vertical traction roller 307 and the transverse traction roller 308, the bend is gradually formed. With the help of the circulating liquid tank 401, the circulating treatment pipe 402, the warm water spray pipe 403, the cold water spray pipe 404 and the water pump 405, the bend is cooled and shaped to achieve the bend forming.

[0069] S4. Cutting and Discharging: The cutting position is adjusted according to the position of the bend by adjusting the electric slide rail 407, adjusting the operating frame 408, the annular electric slide rail 409, the cutting hydraulic cylinder 410, the cutting operating sleeve 411, the cold cutting motor 412 and the cutting blade 413, and then contact cutting is performed. The surface is dried and dehydrated in conjunction with the dehydration electric slide rail 414, the detachment operating frame 415 and the dehydration sponge 416, so as to realize the segmented processing and drying discharge of the bend.

[0070] A molding box 2 is provided at one end of the fixed extruder 1, and a molding guide component 3 is provided at the side end of the molding box 2;

[0071] The forming guide assembly 3 includes a pipe forming mold 301, a support integration frame 302, a transverse integration frame 303, a support hydraulic cylinder 304, an electric universal wheel 305, a traction motor 306, a vertical traction roller 307, a transverse traction roller 308, a shifting motor 309, a shifting operation frame 310, a correction motor 311, an inner lining positioning frame 312, a combined positioning frame 313, a swing motor 314, a swing operation plate 315, an alignment motor 316, a rotary motor 317, a rotary gear 318, a linkage gear 319, a linkage operation frame 320, an outward push electric push rod 321, an outward push operation block 322, a bearing hydraulic cylinder 323, a bearing positioning plate 324, and a fixed electromagnet 325.

[0072] A pipe forming die 301 is installed at one end of the fixed extruder 1. One end of the pipe forming die 301 is snapped together with the isolation forming box 2 to achieve stable assembly. Several support integration frames 302 are equidistantly arranged inside the isolation forming box 2, and several transverse integration frames 303 are equidistantly arranged inside the isolation forming box 2.

[0073] Both the support integration frame 302 and the transverse integration frame 303 are symmetrically connected to the bottom of the support hydraulic cylinder 304. The bottom of the support hydraulic cylinder 304 is equipped with an electric universal wheel 305. The side of the electric universal wheel 305 is in contact with the bottom of the inner side of the isolation molding box 2 to ensure the stability of support traction and support positioning.

[0074] A traction motor 306 is mounted on one end of the inner side of both the support frame 302 and the transverse frame 303 via a motor mount. A vertical traction roller 307 is rotatably connected to the inner side of the support frame 302 at the position corresponding to the traction motor 306, and a transverse traction roller 308 is rotatably connected to the inner side of the transverse frame 303 at the position corresponding to the traction motor 306.

[0075] Both the support frame 302 and the transverse frame 303 have a shift motor 309 mounted on their bottom ends via a motor mount. One end of the vertical traction roller 307 and the transverse traction roller 308 is engaged with the output shaft of the shift motor 309 to achieve rotational traction of the pipeline. The output shaft of the shift motor 309 is engaged with a shift operation frame 310. The top of the shift operation frame 310 is rotatably connected to the bottom ends of the support frame 302 and the transverse frame 303 to ensure stable rotational support and angle correction. One end of the shift operation frame 310 has a correction motor 311 mounted on its inner side via a motor mount. The output shafts of multiple correction motors 311 are engaged with the bottom ends of the support frame 302 and the transverse frame 303 to achieve angle and position correction and ensure the accuracy of their bending alignment.

[0076] Several inner lining positioning frames 312 are equidistantly arranged on the inner side of the isolation molding box 2. One end of one inner lining positioning frame 312 is engaged with one end of the pipe forming mold 301 to ensure the stability of support positioning and forming restriction. A combined positioning frame 313 is welded to the side end of the inner lining positioning frame 312.

[0077] One end of the combined positioning frame 313 is equipped with a swing motor 314 via a motor mount. The output shaft of the swing motor 314 is snapped with a swing operation plate 315. The swing operation plate 315 is rotatably mounted on the top of the combined positioning frame 313 to achieve steady swing support and swing restriction. One end of the swing operation plate 315 is equipped with a positioning motor 316 via a motor mount at the position corresponding to the inner lining positioning frame 312. The output shaft of the positioning motor 316 is snapped with one end of the inner lining positioning frame 312 to achieve rotational alignment and angle correction.

[0078] A rotary motor 317 is mounted on one end of the inner side of the inner lining positioning frame 312 via a motor mount, and a rotary gear 318 is engaged with the output shaft of the rotary motor 317.

[0079] The inner lining positioning frame 312 is rotatably connected to a linkage gear 319. The rotating gear 318 meshes with the linkage gear 319 to ensure the stability of meshing transmission and rotational shifting. The linkage gear 319 is snapped with a linkage operation frame 320 on its side.

[0080] Several outward push electric actuators 321 are equidistantly installed on the side end of the linkage operation frame 320, and an outward push operation block 322 is installed on one end of the outward push electric actuator 321.

[0081] A bearing hydraulic cylinder 323 is installed at the bottom center of the shifting operation frame 310. A bearing positioning plate 324 is installed at the bottom of the bearing hydraulic cylinder 323. A fixed electromagnet 325 is fitted at the bottom of the bearing positioning plate 324.

[0082] To ensure stable operation of the equipment, the input terminals of the fixed extruder 1, the supporting hydraulic cylinder 304, the electric universal wheel 305, the traction motor 306, the shifting motor 309, the correction motor 311, the swing motor 314, the alignment motor 316, the rotary motor 317, the external push electric push rod 321, the bearing hydraulic cylinder 323, and the fixed electromagnet 325 are all electrically connected to the output terminal of the external controller.

[0083] The input terminal of the external controller is electrically connected to the output terminal of the external power supply.

[0084] A cold forming separation component 4 is provided on the side of the isolation molding box 2;

[0085] The cold forming separation assembly 4 includes a circulating storage tank 401, a circulating processing pipe 402, a warm water spray pipe 403, a cold water spray pipe 404, a water pump 405, a water collection rack 406, a correction electric slide rail 407, a correction operation rack 408, a ring electric slide rail 409, a cutting hydraulic cylinder 410, a cutting operation sleeve 411, a cold cutting motor 412, a cutting blade 413, a dehydration electric slide rail 414, a detachment operation rack 415, and a dehydration sponge 416.

[0086] A circulating liquid storage tank 401 is installed at one end of the isolation molding box 2, and a circulating processing pipe 402 is connected through the side end of the circulating liquid storage tank 401.

[0087] A warm water spray pipe 403 runs through one side of the top of the isolation molding box 2, and a circulation treatment pipe 402 runs through and is installed on the side of the isolation molding box 2. One end of the warm water spray pipe 403 is embedded in the inside of the circulation storage tank 401 to achieve steady spray cooling and cooling water recycling, thereby improving the water circulation and cooling shaping effect. A cold water spray pipe 404 runs through the other side of the top of the isolation molding box 2.

[0088] A water pump 405 is installed on the side of the circulating liquid storage tank 401 at the positions corresponding to the circulating treatment pipe 402, the warm water spray pipe 403 and the cold water spray pipe 404 via a motor mount. A water-blocking collection rack 406 is welded to one end of the inner side of the isolation molding box 2.

[0089] A correction electric slide rail 407 is installed inside the isolation molding box 2. A correction operation frame 408 is installed on the side end of the correction electric slide rail 407 through the slide rail seat. The correction operation frame 408 is slidably installed inside the isolation molding box 2 to achieve correction support and alignment stability.

[0090] One end of the correction operation frame 408 is embedded with an annular electric slide rail 409, and a cutting hydraulic cylinder 410 is mounted on one end of the annular electric slide rail 409 via a slide rail seat.

[0091] A cutting operation sleeve 411 is attached to the bottom of the cutting hydraulic cylinder 410. A cold cutting motor 412 is installed inside the cutting operation sleeve 411 via a motor mount. A cutting blade 413 is attached to the output shaft of the cold cutting motor 412.

[0092] A dehydration electric slide rail 414 is snapped into the inner side of the isolation molding box 2 near the position of the correction electric slide rail 407. The side end of the dehydration electric slide rail 414 is connected to the release operation frame 415 through the slide rail seat. The longitudinal section of the release operation frame 415 is U-shaped to ensure the stability of clamping and dehydration contact. A dehydration sponge 416 is installed inside the release operation frame 415.

[0093] To ensure stable operation of the equipment, the input terminals of the water pump 405, the correction electric slide rail 407, the annular electric slide rail 409, the cutting hydraulic cylinder 410, the cold cutting motor 412, and the dehydration electric slide rail 414 are all electrically connected to the output terminal of an external controller.

[0094] The high-density polyethylene seamless bend with polyurethane insulation produced by the manufacturing method of high-density polyethylene seamless bend with polyurethane insulation.

[0095] The working principle and usage process of this invention are as follows: During the production of insulated bends, the operator adjusts the position of the support integration frame 302 and the transverse integration frame 303 inside the isolation forming box 2 according to the bending angle of the bend. The support hydraulic cylinder 304 drives the electric universal wheel 305 to move down, so that the electric universal wheel 305 contacts the bottom of the inner side of the isolation forming box 2. After the contact is completed, the bearing hydraulic cylinder 323 drives the bearing positioning plate 324 and the fixing electromagnet 325 to rise, thereby replacing the support component. The shifting motor 309 drives the shifting operation frame 310 to rotate along the first support integration frame 302. The shifting operation frame 310 drives the transverse integration frame 303 to rotate. During the rotation, the correction motor 311 drives the transverse integration frame 303 to rotate along the shifting operation frame 310, thereby correcting the angle of the transverse integration frame 303. The electric universal wheel 305 provides support and guidance, thereby adjusting the angle between the support integration frame 302 and the transverse integration frame 303.

[0096] Then, the shifting motor 309 at the bottom of the transverse integration frame 303 drives the shifting operation frame 310 to rotate. The shifting operation frame 310 drives the second support integration frame 302 to rotate. The correction motor 311 drives the support integration frame 302 to rotate along the shifting operation frame 310, thereby correcting the angle between the second support integration frame 302 and the first transverse integration frame 303. The upward operation is repeated to correct the angle between multiple sets of support integration frames 302 and transverse integration frames 303, thus forming a large arc-shaped guide component. This allows for quick correction of the bending position according to the bending angle of the pipe elbow during production, facilitating the rapid production of elbows with different angles.

[0097] When correcting the angle between the support frame 302 and the transverse frame 303, the swing motor 314 drives the swing operation plate 315 and the alignment motor 316 to rotate. The alignment motor 316 drives the inner lining positioning frame 312 and the combined positioning frame 313 to rotate, changing the angle between the two sets of inner lining positioning frames 312 and combined positioning frames 313. Thus, the angle between the support frame 302 and the transverse frame 303 is corrected and adjusted. After the angle correction is completed, the bearing hydraulic cylinder 323 drives the bearing positioning plate 324 and the fixed electromagnet 325 to move down. The fixed electromagnet 325 is magnetically combined with the isolation molding box 2 to achieve magnetic fixation of the support frame 302, the transverse frame 303 and the shifting operation frame 310, thus achieving overall support and positioning.

[0098] Raw materials are fed into the hopper of a fixed extruder 1 via a conveying device. The fixed extruder 1 extrudes hot melt material, which is then shaped and cooled by a pipe forming die 301, achieving initial pipe shape. The pipe then enters the inner side of the isolation forming box 2 along the pipe forming die 301. A traction motor 306 drives a vertical traction roller 307 to rotate along a supporting frame 302, and a traction motor 306 drives a horizontal traction roller 308 to rotate along a horizontal integrating frame 303. The vertical traction roller 307 and the horizontal traction roller 308 then guide the outer end of the pipe... While performing rotational traction, edge correction is carried out. In conjunction with the external push electric actuator 321, the external push operation block 322 moves along the linkage operation frame 320 to the inner wall of the pipe. At this time, the rotary motor 317 drives the rotary gear 318 to rotate along the inner lining positioning frame 312. The rotary gear 318 meshes with the linkage gear 319 to drive the linkage operation frame 320, the external push electric actuator 321 and the external push operation block 322 to rotate slowly. By using the double pressing inside and outside, the shape of the pipe is corrected and the pipe is supported, so as to achieve the steady production of the pipe.

[0099] During pipe bending production, water is drawn from the circulating storage tank 401 by the water pump 405 and the warm water spray pipe 403. The water is sprayed onto the inside of the isolation forming box 2 along the warm water spray pipe 403. The water directly sprays and cools the outside of the pipe. The warm water generated by the pipe cooling flows along the pipe and the isolation forming box 2 to the water blocking and collecting rack 406. At this time, the warm water at the water blocking and collecting rack 406 is drawn from the water pump 405 and the circulating treatment pipe 402 and flows back to the inside of the circulating storage tank 401. The pipe is slowly cooled by the warm water spray cooling treatment, which prolongs its cooling time, increases the time for bending correction, and ensures the stability of pipe bending and shape correction.

[0100] After the correction is completed, cold water is drawn by the water pump 405 and the cold water spray pipe 404 to spray and quickly cool the pipeline, achieving a complete shaping treatment. The shaped pipeline is then moved to the cutting position, and the correction operation frame 408 is moved along the isolation forming box 2 by the correction electric slide rail 407. The pipeline passes through the position of the correction operation frame 408. During the pipeline movement, the dehydration electric slide rail 414 moves the detachment operation frame 415 to attach the dehydration sponge 416 to the side of the pipeline. The dehydration sponge 416 dries and absorbs water from the pipeline. The process involves drying the pipe surface and moving it to the required size. The cutting hydraulic cylinder 410 then moves the cutting operating sleeve 411, causing the cold cutting motor 412 to rotate and the cutting blade 413 to rotate. The cutting blade 413 contacts the pipe surface and moves in conjunction with the cutting hydraulic cylinder 410, completely embedding the cutting blade 413 into the inside of the pipe. Then, the annular electric slide rail 409 moves the cutting hydraulic cylinder 410 and the cutting blade 413, achieving annular cutting of the pipe and thus segmenting the pipe.

[0101] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for preparing high-density polyethylene seamless bends and polyurethane insulated elbows, comprising a fixed extruder, wherein an isolation molding box (2) is provided at one end of the fixed extruder (1), and a molding guide assembly (3) is provided at the side end of the isolation molding box (2); the molding guide assembly (3) includes a pipe forming die (301); a pipe forming die (301) is installed at one end of the fixed extruder (1), and a plurality of supporting integration frames (302) are equidistantly arranged inside the isolation molding box (2), and a plurality of transverse integration frames (303) are equidistantly arranged inside the isolation molding box (2); a supporting hydraulic cylinder (304) is symmetrically engaged at the bottom end of both the supporting integration frame (302) and the transverse integration frame (303), and an electric universal wheel (305) is installed at the bottom end of the supporting hydraulic cylinder (304); a shifting motor (309) is installed at the bottom end of both the supporting integration frame (302) and the transverse integration frame (303) through a motor mount. The output shaft of the shifting motor (309) is engaged with a shifting operation frame (310). A correction motor (311) is mounted on one end of the inner side of the shifting operation frame (310) via a motor mount. The top of the shifting operation frame (310) is rotatably connected to the bottom of the support integration frame (302) and the transverse integration frame (303). The output shafts of multiple correction motors (311) are respectively engaged with the bottom of the support integration frame (302) and the transverse integration frame (303). Several inner lining positioning frames (312) are equidistantly arranged inside the isolation molding box (2). A combined positioning frame (313) is welded to the side of each inner lining positioning frame (312). A swing motor (314) is mounted on one end of each combined positioning frame (313) via a motor mount. A swing operation plate (315) is engaged on the output shaft of the swing motor (314). One end of the swing operation plate (315) corresponds to one of the inner lining positioning frames. A positioning motor (316) is installed at position 312 via a motor mount; a rotary motor (317) is installed at one end of the inner side of the lining positioning frame (312) via a motor mount, and a rotary gear (318) is engaged with the output shaft of the rotary motor (317); a linkage gear (319) is rotatably connected to the inner side of the lining positioning frame (312), and a linkage operation frame (320) is engaged with the side end of the linkage gear (319); several external push electric push rods (321) are equidistantly installed on the side end of the linkage operation frame (320), and an external push operation block (322) is installed at one end of the external push electric push rod (321); one end of the lining positioning frame (312) is engaged with one end of the pipe forming mold (301), the output shaft of the positioning motor (316) is engaged with one end of the lining positioning frame (312), and the rotary gear (318) is meshed with the linkage gear (319).

2. The apparatus for preparing high-density polyethylene seamless bends and polyurethane insulated elbows according to claim 1, characterized in that, One end of the pipe forming mold (301) is snapped into the isolation forming box (2), and the side end of the electric universal wheel (305) is attached to the bottom inner side of the isolation forming box (2).

3. The apparatus for preparing high-density polyethylene seamless bends and polyurethane insulated elbows according to claim 2, characterized in that, The bottom center of the transposition operation frame (310) is equipped with a bearing hydraulic cylinder (323), the bottom end of the bearing hydraulic cylinder (323) is equipped with a bearing positioning plate (324), and the bottom end of the bearing positioning plate (324) is fitted with a fixing electromagnet (325). The swing operation plate (315) is rotatably mounted on the top of the combined positioning frame (313).

4. The apparatus for preparing high-density polyethylene seamless bends and polyurethane insulated elbows according to claim 3, characterized in that, The input ends of the fixed extruder (1), the supporting hydraulic cylinder (304), the electric universal wheel (305), the traction motor (306), the shifting motor (309), the correction motor (311), the swing motor (314), the alignment motor (316), the rotary motor (317), the external push electric push rod (321), the bearing hydraulic cylinder (323), and the fixed electromagnet (325) are all electrically connected to the output end of the external controller; The input terminal of the external controller is electrically connected to the output terminal of the external power supply.

5. The apparatus for preparing high-density polyethylene seamless bends and polyurethane insulated elbows according to claim 4, characterized in that, The side end of the isolation molding box (2) is provided with a cold forming separation component (4); The cold forming separation component (4) includes a circulating liquid storage tank (401); The isolation molding box (2) is equipped with a circulating liquid storage tank (401) at one end, and a circulating processing pipe (402) is connected through the side end of the circulating liquid storage tank (401). A warm water spray pipe (403) runs through one side of the top of the isolation molding box (2), and a cold water spray pipe (404) runs through the other side of the top of the isolation molding box (2). A water pump (405) is installed on the side of the circulating liquid storage tank (401) at the positions of the circulating treatment pipe (402), the warm water spray pipe (403) and the cold water spray pipe (404) via a motor mount. A water-blocking collection rack (406) is welded to one end of the inner side of the isolation molding box (2). The inner side of the isolation molding box (2) is equipped with a correction electric slide rail (407), and the side end of the correction electric slide rail (407) is equipped with a correction operation frame (408) through the slide rail seat. One end of the correction operation frame (408) is embedded with an annular electric slide rail (409), and a cutting hydraulic cylinder (410) is mounted on the other end of the annular electric slide rail (409) through a slide rail seat.

6. The apparatus for preparing high-density polyethylene seamless bends and polyurethane insulated elbows according to claim 5, characterized in that, The bottom end of the cutting hydraulic cylinder (410) is fitted with a cutting operation sleeve (411), and a cold cutting motor (412) is installed inside the cutting operation sleeve (411) via a motor mount. The output shaft of the cold cutting motor (412) is fitted with a cutting blade (413). The inner side of the isolation molding box (2) is fitted with a dehydration electric slide rail (414) near the correction electric slide rail (407). The side end of the dehydration electric slide rail (414) is connected to a release operation frame (415) via a slide rail seat. A dehydration sponge (416) is installed inside the release operation frame (415). The circulating treatment pipe (402) is installed through the side of the isolation molding box (2), and one end of the warm water spray pipe (403) is embedded in the inside of the circulating liquid storage tank (401).

7. The apparatus for preparing high-density polyethylene seamless bends and polyurethane insulated elbows according to claim 6, characterized in that, The correction operation frame (408) is slidably installed inside the isolation molding box (2), and the longitudinal section of the disengagement operation frame (415) is U-shaped; The input terminals of the water pump (405), the correction electric slide rail (407), the annular electric slide rail (409), the cutting hydraulic cylinder (410), the cold cutting motor (412), and the dehydration electric slide rail (414) are all electrically connected to the output terminal of the external controller.

8. A method for preparing a high-density polyethylene seamless bend with polyurethane insulation, using the preparation apparatus as described in claims 1-7, characterized in that, Includes the following steps: S1. Raw material hot melting: The required material is put into the feed hopper of the fixed extruder (1) and the raw material is hot melted by the fixed extruder (1); S2, Extrusion Traction: Polyethylene mixture is extruded through a fixed extruder (1) and pipe forming die (301) and filled and shaped. The pipe is tractioned by a traction motor (306), vertical traction roller (307) and horizontal traction roller (308). The inner lining is supported by an inner lining positioning frame (312), a combined positioning frame (313) and a linkage operation frame (320) to achieve extrusion shaping and traction outward discharge. S3, Correction and Cooling: Multiple support integration frames (302) and transverse integration frames (303) are driven to rotate sequentially by the shifting motor (309) and correction motor (311) to form an arc angle. Under the lateral support and restriction of the vertical traction roller (307) and transverse traction roller (308), they are gradually bent and cooled and shaped in conjunction with the warm water spray pipe (403), cold water spray pipe (404) and water pump (405). S4. Cutting and feeding: The cutting position is adjusted according to the position of the bent pipe by adjusting the electric slide rail (407), the cutting hydraulic cylinder (410), the cutting operation sleeve (411) and the cold cutting motor (412), and the contact cutting is performed. The surface is dried and dehydrated with the help of the dehydrating sponge (416).

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