High-density polyethylene seamless heat preservation bent pipe preparation method and bent pipe thereof

Abstract

The invention discloses a high-density polyethylene seamless heat preservation bent pipe preparation method and a bent pipe thereof, and relates to the technical field of pipe machining, and the method comprises the following steps: S1, pouring polyethylene particles into an extruder, then extruding through an annular extrusion pipe, machining an arc-shaped polyethylene pipeline, and meanwhile, through the cooperation of a water flow transfer box, a spraying pipe, a water pumping pipe and a water pump, forming an arc-shaped polyethylene pipeline; the steel pipe bending device is scientific and reasonable in structure and safe and convenient to use, a bending and adjusting mechanism is arranged, through cooperation of a clamping ring, a rotating cylinder, a lead screw, a clamping block and a telescopic sleeve rod, the diameter capable of being clamped is adjusted, steel pipes with different outer diameters can be conveniently clamped and fixed, in the bending process, the steel pipes can be conveniently bent, and the steel pipes with the different outer diameters can be conveniently clamped and fixed through the clamping ring, the rotating cylinder, the lead screw, the clamping block and the telescopic sleeve rod. In addition, during bending, the clamping ring can rotate along with the bending degree of the steel belt, is always parallel to the cross section of the steel pipe, and enters and exits after bending.

Description

Technical Field

[0001] The invention relates to the technical field of pipe processing, in particular to a method for preparing a seamless thermal insulation bent pipe of high-density polyethylene and the bent pipe. Background Art

[0002] The polyethylene seamless insulated elbow is a pipe with an integrally formed outer protective pipe as the core, combined with an insulation layer and a metal elbow to form a multi-layer composite structure, which has both sealing, pressure resistance and thermal insulation performance. For example, a processing technology for seamless high-strength stainless steel pipes is disclosed, application number (CN 202010242525.1). The patent uses a drying chamber to dry the surface of the stainless steel pipe, and evenly applies pressure-sensitive adhesive on the surface of the stainless steel pipe; However, in the production process of this patent, it is not convenient to easily bend steel pipes of different outer diameters as needed, and the curvature of the steel pipe cannot be equal to the curvature of the polyethylene pipe, which affects the effect of subsequent combined sleeve connection. Therefore, in order to avoid the above technical problems, we need to provide a method for preparing a seamless insulated bent pipe of high-density polyethylene and its bent pipe to overcome the above defects in the prior art. Summary of the invention

[0003] The present invention provides a method for preparing a seamless thermal insulation bent pipe of high-density polyethylene and the bent pipe thereof, which can effectively solve the problem proposed in the above background technology that it is inconvenient to conveniently bend steel pipes of different outer diameters as needed, and at the same time, the curvature of the steel pipe cannot be equal to the curvature of the polyethylene pipe, which affects the effect of subsequent combined sleeve connection.

[0004] To achieve the above object, the present invention provides the following technical solution: a method for preparing a seamless thermal insulation elbow of high-density polyethylene, comprising the following steps: S1. Pour polyethylene granules into the extruder, extrude them through the annular extrusion tube, and process them into arc-shaped polyethylene pipes. At the same time, spray cooling water through the water transfer box, spray pipe, pumping pipe and water pump to cool and shape them; S2, using the cooperation of the traction roller and the micro motor to traction and transport the polyethylene pipe, so that the polyethylene pipe is embedded in the semi-ring frame, and then the polyethylene pipe that meets the processing length is cut by the cooperation of the rotating motor and the cutting disc; S3. The polyethylene pipe is clamped and fixed by cooperating with the push rod and the arc-shaped clamping plate on the movable ring, and then the pad is pushed along the annular bracket to move to one side of the extrusion platform; S4, insert the steel pipe into the clamping ring and fix it, then start the hydraulic push rod to push the push frame, movable rod, stamping plate and clamping ring to move, so as to facilitate stamping and bending of the steel pipe; S5, make the bent steel pipe correspond to the polyethylene pipe inside the half ring frame, so as to facilitate the steel pipe to pass through the polyethylene pipe, and then clamp and fix it through the mandrel and arc clamping plate on the fixing ring, so that the polyethylene pipe assembly is sleeved on the outside of the steel pipe; S6. Seal both ends of the polyethylene pipe outside the steel pipe, and fill the space between the steel pipe and the polyethylene pipe with insulation material. After the insulation material solidifies, remove the processed polyethylene insulation elbow.

[0005] According to the above technical solution, one end of the annular bracket is connected to an extrusion platform, the other end of the annular bracket is connected to an extruder, and a bending and adjustment mechanism is provided at the top of the extrusion platform, and the bending and adjustment mechanism includes a fixing plate; A fixing plate is clamped at one side of the top of the extrusion platform, a push rod is equidistantly connected to the inside of the fixing plate through a thread, and the other end of the push rod is rotatably connected to a bending clamping seat; The top of the extrusion platform is provided with a slide groove at positions on both sides of the bending seat, a positioning rod is clamped inside the slide groove, a slide plate is movably sleeved outside the positioning rod, a rotating seat is rotatably connected at one side of the top of the slide plate, a clamping ring is clamped at the top of the rotating seat, a rotating cylinder is rotatably connected to the inner wall of the clamping ring, a screw rod is connected inside the rotating cylinder through a thread, a clamping block is clamped at the other end of the screw rod, and a telescopic sleeve rod is symmetrically clamped at one end of the clamping block; One end of the clamping ring is rotatably connected to a rotating ring, one end of the rotating ring is clamped with a driving gear ring, and the outer side of the rotating cylinder is fixedly sleeved with a driven gear ring; A vertical plate is clamped at the other side of the top of the two slides, and a pushing rack is clamped at one end of the two vertical plates. A movable rod is equidistantly connected inside the pushing rack, a stamping plate is clamped at one end of the movable rod, and supporting springs are clamped at the outer positions of the movable rods corresponding to the stamping plate and the pushing rack. A mounting rack is equidistantly connected to the top of the extrusion platform at a position on one side of the pushing rack, and a hydraulic push rod is installed inside the mounting rack.

[0006] According to the above technical solution, the bottom end of the bending base is slidably connected to the top of the extrusion platform, the outer side of the slide plate is slidably connected to the inner wall of the slide groove, the other end of the push rod is clamped with a turntable, the clamping block is arc-shaped, the other end of the telescopic sleeve is connected to the inner wall of the clamping ring, the axes of the two clamping rings correspond to each other, and the active gear ring and the driven gear ring are meshed with each other.

[0007] According to the above technical solution, the curvature of the stamping plate and the bending seat is equal to the curvature of the annular bracket, the hydraulic push rod is powered by an external power supply, and the other end of the hydraulic push rod is connected to one end of the pushing frame.

[0008] According to the above technical solution, a spraying and traction cutting mechanism is provided at the top of the annular bracket near one side of the extruder, and the spraying and traction cutting mechanism includes an arc-shaped water tank; An arc-shaped water tank is installed at the bottom of the annular bracket near one side of the extruder, the top of the arc-shaped water tank is clamped with an arc-shaped channel, the top of the arc-shaped channel is clamped with a water flow transfer box, and the bottom of the water flow transfer box is equidistantly clamped with a spray pipe, one end of the arc-shaped water tank and one end of the water flow transfer box are clamped with a water pump, and a water pump is installed outside the water pump; An annular extrusion tube is clamped at one end of the extruder at a position inside the arc-shaped channel, and an arc-shaped baffle is symmetrically clamped at the other end of the annular extrusion tube; A transverse frame is equidistantly connected to the top of the inner part of the arc-shaped channel, an adjusting rod is symmetrically rotatably connected to the inner wall of the transverse frame, an adjusting block is symmetrically sleeved on the outer side of the adjusting rod through a thread, a traction roller is rotatably connected to the bottom end of the adjusting block, a support ring is sleeved on the outer side of the traction roller through a thread, and a micro motor is installed on the top of the adjusting block on the same side; A gantry is clamped at the top of the annular bracket at a position corresponding to one side of the arc channel, an electric push rod is symmetrically clamped inside the gantry, a lifting frame is threadedly connected to the bottom end of the electric push rod, a rotating motor is threadedly connected to one end of the lifting frame, and a cutting disc is clamped at one end of the output shaft of the rotating motor.

[0009] According to the above technical solution, the interior of the arc-shaped water tank is filled with cooling water, the curvature of the arc-shaped water tank and the arc-shaped channel is equal to the curvature of the annular bracket, the water pump is powered by an external electric power, a connecting groove is provided at the top of the annular bracket corresponding to the bottom of the arc-shaped channel, and the curvature of the annular extrusion tube and the arc-shaped baffle is equal to the curvature of the arc-shaped channel.

[0010] According to the above technical solution, the outer side of the adjustment block is slidably connected to the inner wall of the horizontal frame, the threads at both ends of the outer side of the adjustment rod rotate in opposite directions, the outer side of the lifting frame is slidably connected to the inner wall of the gantry, and the micro motor, electric push rod and rotating motor are all powered by an external power supply.

[0011] According to the above technical solution, a clamping assembly mechanism is provided at the middle position of the top end of the annular bracket, and the clamping assembly mechanism includes a pad; A backing plate is slidably connected at the middle position of the top of the annular bracket, a semi-ring frame is installed at the top of the backing plate, a fixed ring is symmetrically clamped on the inner wall of the semi-ring frame, and a movable ring is equidistantly connected between the two corresponding fixed rings inside the semi-ring frame, and a positioning pin is symmetrically connected to the outer side of the movable ring through a thread, and a positioning hole is opened on the outer side of the semi-ring frame at a position corresponding to the outer side of the positioning pin; Both ends of the fixed ring and the movable ring are rotatably connected with a push rod, the other end of the push rod is rotatably connected with an arc clamping plate, and one end of the arc clamping plate is clamped with an anti-deflection rod at a position corresponding to the bottom of the push rod.

[0012] According to the above technical solution, the curvature of the pad is equal to the curvature of the annular bracket, the outer side of the positioning pin is adjacent to the inner wall of the positioning hole through a thread, the outer side of the movable ring is slidably connected to the inner wall of the semi-ring frame, the top of the fixed ring and the movable ring are both provided with slots, and the inner wall of the fixed ring and the inner wall of the movable ring are both slidably connected to the outer side of the anti-deflection rod.

[0013] According to the above technical scheme, a seamless thermal insulation elbow of high-density polyethylene, a seamless thermal insulation elbow used in a method for preparing a seamless thermal insulation elbow of high-density polyethylene, Compared with the prior art, the present invention has the following beneficial effects: the present invention has a scientific and reasonable structure and is safe and convenient to use: 1. A bending and adjustment mechanism is set up. Through the cooperation of the clamping ring, rotating drum, screw rod, clamping block and telescopic sleeve rod, the clamping diameter can be adjusted, which is convenient for clamping and fixing steel pipes with different outer diameters. When bending, the steel pipe is prevented from deflecting, ensuring the bending effect. In addition, when bending, the clamping ring will rotate with the curvature of the steel belt and always keep parallel with the cross section of the steel pipe. After bending, it is convenient to pull the steel pipe out of the clamping ring, ensuring adaptability; Through the cooperation of the push rod, bending card seat, hydraulic push rod, pushing frame, vertical plate and slide plate, it is convenient to push the clamping ring and the steel pipe to move, and through the cooperation of the bending card seat and the stamping plate, it is convenient to bend the steel pipe, so that the curvature of the steel pipe is equal to the curvature of the bending card seat and the ring bracket, and then equal to the curvature of the polyethylene pipe, and the contraction characteristic of the support spring is utilized to prevent the steel pipe from bearing excessive pressure, reduce the damage to the steel pipe, and ensure the effect of stamping and bending. In addition, through the push rod, the position of the bending card seat can be adjusted as needed, the bending position of the steel pipe is changed, so that the steel pipe can correspond to the semi-ring frame, which is convenient for subsequent pushing and improves convenience.

[0014] 2. A spraying and traction cutting mechanism is set up. Through the cooperation of the annular extrusion tube and the arc baffle, the extruded polyethylene pipe is guided and pulled to form a bend, which is convenient for subsequent assembly. At the same time, through the cooperation of the water pump, the water pumping pipe, the arc water tank, the water flow transfer box and the spraying pipe, the extruded polyethylene bend is sprayed and cooled, so that the polyethylene bend is quickly cooled and formed, and the polyethylene bend is prevented from being deformed by collision, so as to ensure the effect of subsequent assembly and increase production efficiency. The water after spraying can be collected for convenient circulation, which reduces the waste of resources; Next, through the coordination of the adjusting rod, adjusting block, traction roller and micro motor, the polyethylene bent pipes with different outer diameters can be clamped and transported, so that the polyethylene bent pipes can move in an arc state, which makes it convenient to transport the polyethylene bent pipes to the inside of the semi-ring frame, thereby improving convenience. The polyethylene bent pipes are cut by the coordination of the rotating motor and the cutting disc to ensure that the length of the polyethylene bent pipes is less than that of the steel pipe, thereby facilitating subsequent assembly and filling.

[0015] 3. A clamping combination mechanism is set up, which facilitates the sliding of the semi-ring frame through the pad, automatically adjusts the position, and facilitates the insertion of polyethylene elbows and steel pipes into the semi-ring frame, thereby improving adaptability. Through the cooperation of the movable ring, the mandrel, the anti-deflection rod and the arc-shaped clamping plate, it is convenient to clamp polyethylene elbows of different outer diameters, thereby ensuring the stability of the polyethylene elbow inside the semi-ring frame and reducing shaking. Through the cooperation of the positioning pin and the positioning hole, the movable ring is convenient to slide and position inside the semi-ring frame, thereby changing the distance between the movable rings, and then adjusting the clamping position according to the length of the polyethylene elbow, thereby improving adaptability. Through the coordination of the fixing ring, the push rod, the anti-deflection rod and the arc-shaped clamp, it is convenient to clamp and fix the steel pipes with different outer diameters, and the position of the polyethylene elbow and the steel pipe can be fine-tuned to make the gap between the polyethylene elbow and the steel pipe equal, which is convenient for the subsequent filling of the insulation material and ensures uniformity.

[0016] In summary, through the cooperation of the bending and adjusting mechanism, the spraying and traction cutting mechanism and the clamping combination mechanism, the polyethylene pipe will quickly form a pipe with a curvature during extrusion, and the steel pipe will also be bent into a pipe with the same curvature as the polyethylene pipe, thereby facilitating the polyethylene pipe combination to be sleeved on the outside of the steel pipe for clamping and fixing, so that the gap between the polyethylene pipe and the steel pipe is equal, thereby ensuring the uniformity of subsequent insulation material filling, while improving the convenience of processing and increasing the speed of production. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0018] In the attached picture: Figure 1 is a flow chart of the preparation method of the present invention; Figure 2 It is a schematic diagram of the installation structure of the fixing plate of the present invention; Figure 3 It is a structural schematic diagram of the bending and adjusting mechanism of the present invention; Figure 4 It is a schematic diagram of the installation structure of the rotating seat of the present invention; Figure 5 The present invention Figure 4Schematic diagram of the structure of the middle A area; Figure 6 It is a schematic diagram of the installation structure of the arc-shaped water tank of the present invention; Figure 7 It is a schematic diagram of the installation structure of the gantry of the present invention; Figure 8 It is a structural schematic diagram of the spraying and traction cutting mechanism of the present invention; Fig. 9 It is a structural schematic diagram of the clamping combination mechanism of the present invention.

[0019] Numbers in the figure: 1, ring bracket; 2, extrusion platform; 3, extruder; 4. Bending and adjusting mechanism; 401. fixing plate; 402. push rod; 403. bending card seat; 404. slide slot; 405. positioning rod; 406. slide plate; 407. rotating seat; 408. clamping ring; 409. rotating drum; 410. screw rod; 411. clamping block; 412. telescopic sleeve rod; 413. rotating ring; 414. active gear ring; 415. driven gear ring; 416. vertical plate; 417. pushing frame; 418. movable rod; 419. stamping plate; 420. supporting spring; 421. mounting frame; 422. hydraulic push rod; 5. Spraying and traction cutting mechanism; 501. Arc water tank; 502. Arc channel; 503. Water flow transfer box; 504. Spray pipe; 505. Pumping pipe; 506. Water pump; 507. Ring extrusion pipe; 508. Arc baffle; 509. Horizontal frame; 510. Adjustment rod; 511. Adjustment block; 512. Support ring; 513. Traction roller; 514. Micro motor; 515. Gantry; 516. Electric push rod; 517. Lifting frame; 518. Rotating motor; 519. Cutting disc; 6. Clamping assembly; 601. Pad; 602. Half-ring frame; 603. Fixed ring; 604. Movable ring; 605. Positioning pin; 606. Positioning hole; 607. Push rod; 608. Arc-shaped clamping plate; 609. Anti-deflection rod. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0021] Example: Figure 1-9 As shown, the present invention provides a technical solution, a method for preparing a seamless thermal insulation elbow of high-density polyethylene, comprising the following steps: S1, pouring polyethylene granules into the extruder 3, and then extruding through the annular extrusion tube 507 to process an arc-shaped polyethylene pipe, and at the same time spraying cooling water through the water transfer box 503, the spray pipe 504, the pumping pipe 505 and the water pump 506 to cool and shape; S2, using the cooperation of the traction roller 513 and the micro motor 514 to traction and transport the polyethylene pipe, so that the polyethylene pipe is embedded in the semi-ring frame 602, and then the polyethylene pipe that meets the processing length is cut by the cooperation of the rotating motor 518 and the cutting disc 519; S3, the polyethylene pipe is clamped and fixed by the cooperation of the push rod 607 and the arc clamping plate 608 on the movable ring 604, and then the pad 601 is pushed along the annular support 1 to the side of the extrusion platform 2; S4, insert the steel pipe into the clamping ring 408 and fix it, then start the hydraulic push rod 422 to push the push frame 417, the movable rod 418, the stamping plate 419 and the clamping ring 408 to move, so as to facilitate stamping and bending of the steel pipe; S5, make the bent steel pipe correspond to the polyethylene pipe inside the half ring frame 602, so as to facilitate the steel pipe to pass through the polyethylene pipe, and then clamp and fix it through the mandrel 607 and the arc clamping plate 608 on the fixing ring 603, so that the polyethylene pipe assembly is sleeved on the outside of the steel pipe; S6, plugging both ends of the polyethylene pipe outside the steel pipe, filling the space between the steel pipe and the polyethylene pipe with insulation material, and removing the processed polyethylene insulation elbow after the insulation material solidifies; One end of the annular bracket 1 is connected to an extrusion platform 2, and the other end of the annular bracket 1 is connected to an extruder 3. A bending and adjusting mechanism 4 is provided at the top of the extrusion platform 2, and the bending and adjusting mechanism 4 includes a fixing plate 401; A fixing plate 401 is clamped at one side of the top of the extrusion platform 2, and a push rod 402 is equidistantly connected to the inside of the fixing plate 401 through a thread, and the other end of the push rod 402 is rotatably connected to a bending clamping seat 403; Slide grooves 404 are provided at the positions on both sides of the bending clamping seat 403 corresponding to the top of the extrusion platform 2, and a positioning rod 405 is clamped inside the slide groove 404, and a slide plate 406 is movably sleeved on the outer side of the positioning rod 405, and a rotating seat 407 is rotatably connected to one side of the top of the slide plate 406, and a clamping ring 408 is clamped on the top of the rotating seat 407, and a rotating cylinder 409 is rotatably connected to the inner wall of the clamping ring 408 at an equal distance, and a screw rod 410 is connected to the inside of the rotating cylinder 409 through a thread, and a clamping block 411 is clamped at the other end of the screw rod 410, and a telescopic sleeve rod 412 is symmetrically clamped at one end of the clamping block 411; One end of the clamping ring 408 is rotatably connected to a swivel ring 413, one end of the swivel ring 413 is clamped with a driving gear ring 414, and the outer side of the rotating cylinder 409 is fixedly sleeved with a driven gear ring 415. In order to facilitate the clamping and positioning of the steel pipe, the bottom end of the bending clamp 403 is slidably connected to the top of the extrusion platform 2, the outer side of the slide plate 406 is slidably connected to the inner wall of the slide groove 404, the other end of the push rod 402 is clamped with a turntable, the clamping block 411 is arc-shaped, and the other end of the telescopic sleeve rod 412 is connected to the inner wall of the clamping ring 408. The axes of the two clamping rings 408 correspond to each other, and the driving gear ring 414 and the driven gear ring 415 are meshed with each other; A vertical plate 416 is clamped at the other side of the top of the two slides 406, and a push rack 417 is clamped at one end of the two vertical plates 416. A movable rod 418 is equidistantly connected inside the push rack 417, and a stamping plate 419 is clamped at one end of the movable rod 418. A support spring 420 is clamped at the outer position of the movable rod 418 between the stamping plate 419 and the push rack 417. A mounting frame 421 is equidistantly connected at a position on one side of the push rack 417 at the top of the extrusion platform 2. A hydraulic push rod 422 is installed inside the mounting frame 421. In order to facilitate bending of the steel pipe, the curvature of the stamping plate 419 and the bending seat 403 is equal to the curvature of the annular bracket 1. The hydraulic push rod 422 is powered by an external power supply, and the other end of the hydraulic push rod 422 is connected to one end of the push rack 417. A spraying and traction cutting mechanism 5 is provided at the top of the annular support 1 near the extruder 3, and the spraying and traction cutting mechanism 5 includes an arc-shaped water tank 501; An arc-shaped water tank 501 is installed at the bottom of the annular bracket 1 near one side of the extruder 3, the top of the arc-shaped water tank 501 is clamped with an arc-shaped channel 502, the top of the arc-shaped channel 502 is clamped with a water flow transfer box 503, and the bottom of the water flow transfer box 503 is equidistantly clamped with a spray pipe 504, one end of the arc-shaped water tank 501 and one end of the water flow transfer box 503 are clamped with a water pump 505, and a water pump 506 is installed outside the water pump 505; An annular extrusion tube 507 is clamped at one end of the extruder 3 at a position corresponding to the inner portion of the arc-shaped channel 502, and an arc-shaped baffle 508 is symmetrically clamped at the other end of the annular extrusion tube 507; A horizontal frame 509 is equidistantly connected to the top of the inner arc channel 502, and an adjusting rod 510 is symmetrically rotatably connected to the inner wall of the horizontal frame 509. An adjusting block 511 is symmetrically sleeved on the outer side of the adjusting rod 510 through a thread. A traction roller 513 is rotatably connected to the bottom end of the adjusting block 511. A support ring 512 is sleeved on the outer side of the traction roller 513 through a thread. A micro motor 514 is installed on the top of the adjusting block 511 on the same side. In order to facilitate the spray cooling of the extruded outer sheath, the arc water tank 501 is filled with cooling water. The curvature of the arc water tank 501 and the arc channel 502 are equal to the curvature of the annular bracket 1. The water pump 506 is powered by an external electric power supply. A connecting groove is provided at the top of the annular bracket 1 corresponding to the bottom of the arc channel 502. The curvature of the annular extrusion tube 507 and the arc baffle 508 are equal to the curvature of the arc channel 502. A gantry 515 is clamped at the position on one side of the arc-shaped channel 502 corresponding to the top of the annular bracket 1, and an electric push rod 516 is symmetrically clamped inside the gantry 515. The bottom end of the electric push rod 516 is connected to a lifting frame 517 through a thread, and one end of the lifting frame 517 is connected to a rotating motor 518 through a thread. A cutting disc 519 is clamped at one end of the output shaft of the rotating motor 518. In order to facilitate the adjustment of the distance between the two traction rollers 513, the outer side of the adjustment block 511 is slidably connected to the inner wall of the horizontal frame 509, and the threads at the two ends of the outer side of the adjustment rod 510 rotate in opposite directions. The outer side of the lifting frame 517 is slidably connected to the inner wall of the gantry 515, and the micro motor 514, the electric push rod 516 and the rotating motor 518 are all powered by an external power supply; A clamping assembly mechanism 6 is provided at the middle position of the top end of the annular bracket 1, and the clamping assembly mechanism 6 includes a pad 601; A backing plate 601 is slidably connected at the middle position of the top of the annular bracket 1, and a semi-ring frame 602 is installed at the top of the backing plate 601. A fixed ring 603 is symmetrically clamped on the inner wall of the semi-ring frame 602, and a movable ring 604 is equidistantly connected between the two corresponding fixed rings 603 inside the semi-ring frame 602. The outer side of the movable ring 604 is symmetrically connected with a positioning pin 605 through a thread, and a positioning hole 606 is opened on the outer side of the semi-ring frame 602 at a position corresponding to the outer side of the positioning pin 605; Both ends of the fixed ring 603 and both ends of the movable ring 604 are rotatably connected with a push rod 607, and the other end of the push rod 607 is rotatably connected with an arc-shaped clamping plate 608, and an anti-deflection rod 609 is clamped at one end of the arc-shaped clamping plate 608 corresponding to the bottom position of the push rod 607. In order to facilitate the assembly of the extruded outer sheath on the outside of the steel pipe, the curvature of the pad 601 is equal to the curvature of the annular bracket 1, the outer side of the locating pin 605 is adjacent to the inner wall of the locating hole 606 through a thread, the outer side of the movable ring 604 is slidably connected to the inner wall of the semi-ring frame 602, and slots are provided on the top of the fixed ring 603 and the movable ring 604, and the inner wall of the fixed ring 603 and the inner wall of the movable ring 604 are both slidably connected to the outer side of the anti-deflection rod 609.

[0022] The working principle and use process of the present invention are as follows: first, polyethylene is extruded through the extruder 3, and the extruded polyethylene is formed into a curved pipe through the cooperation of the annular extrusion tube 507, and then the curved baffle 508 is used to guide and limit the polyethylene to prevent deformation and ensure the curvature of the curved pipe. At the same time, the water in the curved water tank 501 is sent into the water flow transfer box 503 through the cooperation of the water pump 506 and the water pumping pipe 505, and as the water pressure in the water flow transfer box 503 increases, the water is sprayed out through the spray pipe 504 to cool the polyethylene curved pipe, thereby improving the cooling efficiency and facilitating subsequent processing; Next, the adjusting rod 510 is rotated to push the adjusting block 511 and the traction roller 513 to move along the horizontal frame 509, so as to facilitate the clamping of the polyethylene bent pipes with different outer diameters, and the stability of the polyethylene bent pipes is ensured by the support of the support ring 512, and then the micro motor 514 is started to drive the traction roller 513 to rotate, and the polyethylene bent pipes are pulled and transported, so that the polyethylene bent pipes are transported to the inside of the semi-ring frame 602; Next, when the polyethylene bent pipe is further extended into the half ring frame 602 to a sufficient length, the electric push rod 516 is used to push the lifting frame 517 downward, and the polyethylene bent pipe is cut by the cooperation of the rotating motor 518 and the cutting disc 519; In addition, after the polyethylene bent pipe enters the interior of the semi-ring frame 602, the top rod 607 on the movable ring 604 is rotated, and the arc clamping plate 608 is moved through the limit of the anti-deflection rod 609, thereby changing the distance between the two arc clamping plates 608, clamping and positioning the polyethylene bent pipe, and ensuring the stability of the polyethylene bent pipe inside the semi-ring frame 602. In addition, through the cooperation of the positioning pin 605 and the positioning hole 606, it is convenient to slide the movable ring 604, and the clamping position can be adjusted according to the length of the polyethylene bent pipe, thereby improving adaptability. Next, the half ring frame 602 and the polyethylene bent pipe are moved along the annular support 1 by the backing plate 601, and one end of the half ring frame 602 and the polyethylene bent pipe is close to the extrusion platform 2, and then the steel pipe is inserted into the clamping ring 408, and the rotating ring 413 is rotated. Through the transmission of the active gear ring 414 and the driven gear ring 415, the rotating cylinder 409 inside the clamping ring 408 is pushed to rotate together, thereby pushing the screw rod 410 and the clamping block 411 to move, and at the same time, the clamping block 411 is forced to move by the limit of the telescopic sleeve rod 412, so as to facilitate the clamping and fixing of steel pipes with different outer diameters, thereby improving adaptability; Next, the push rod 402 is rotated to push the bending card seat 403 to move and adjust the bending position. Then, the hydraulic push rod 422 inside the mounting frame 421 is started to push the pushing frame 417, the vertical plate 416, the slide plate 406, the clamping ring 408 and the steel pipe to slide along the slide groove 404, forcing the steel pipe to fit against one end of the bending card seat 403. Then, with the continuous pushing of the hydraulic push rod 422, the stamping plate 419 and the bending card seat 403 cooperate to extrude and bend the steel pipe, and make the bent steel pipe correspond to the polyethylene bent pipe inside the semi-ring frame 602, so as to ensure that the curvature of the steel pipe is equal to the curvature of the polyethylene bent pipe, so as to facilitate the sleeve combination. Finally, during the extrusion and bending process, the clamping ring 408 pushes the curvature of the steel pipe to rotate, always parallel to the cross-section of the steel pipe, and then after the steel pipe is bent, it is convenient for the steel pipe to rotate inside the clamping ring 408, so that the bent steel pipe passes through the polyethylene bent pipe inside the semi-ring frame 602, and because the length of the polyethylene bent pipe is shorter than the length of the steel pipe, after passing through, the top rod 607 on the fixed ring 603 is rotated to push the arc clamp 608 to clamp and position the steel pipe, and at the same time, the top rod 607 on the fixed ring 603 and the movable ring 604 is rotated to adjust the position between the polyethylene bent pipe and the steel pipe, so that the gap between the polyethylene bent pipe and the steel pipe is equal, which is convenient for subsequent filling.

[0023] Finally, it should be noted that the above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preparing a seamless thermal insulation elbow of high-density polyethylene, characterized in that: The steps include: S1, pouring polyethylene granules into the interior of the extruder (3), and then extruding them through the annular extrusion tube (507) to form an arc-shaped polyethylene pipe, and spraying cooling water through the water flow transfer box (503), the spray pipe (504), the water pump (505) and the water pump (506) to cool and shape them; S2, using the cooperation of the traction roller (513) and the micro motor (514) to traction and transport the polyethylene pipe, so that the polyethylene pipe is embedded in the semi-ring frame (602), and then the polyethylene pipe that meets the processing length is cut by the cooperation of the rotating motor (518) and the cutting disc (519); S3, the polyethylene pipe is clamped and fixed by cooperating with the push rod (607) and the arc-shaped clamping plate (608) on the movable ring (604), and then the pad (601) is pushed along the annular support (1) to move to the side of the extrusion platform (2); S4, insert the steel pipe into the clamping ring (408) and fix it, then start the hydraulic push rod (422) to push the push frame (417), the movable rod (418), the stamping plate (419) and the clamping ring (408) to move, so as to facilitate stamping and bending of the steel pipe; S5, making the bent steel pipe correspond to the polyethylene pipe inside the half ring frame (602), so as to facilitate passing the steel pipe through the polyethylene pipe, and then clamping and fixing it through the push rod (607) and the arc clamping plate (608) on the fixing ring (603), so that the polyethylene pipe assembly is sleeved on the outside of the steel pipe; S6. Seal both ends of the movable loop of the polyethylene pipe outside the steel pipe, and fill the space between the steel pipe and the polyethylene pipe with insulation material. After the insulation material solidifies, remove the processed polyethylene insulation bend.

2. The method for preparing a seamless thermal insulation elbow of high-density polyethylene according to claim 1, characterized in that: One end of the annular support (1) is connected to an extrusion platform (2), and the other end of the annular support (1) is connected to an extruder (3). A bending and adjustment mechanism (4) is provided at the top of the extrusion platform (2), and the bending and adjustment mechanism (4) comprises a fixing plate (401); A fixing plate (401) is clamped at one side of the top end of the extrusion platform (2), a push rod (402) is equidistantly connected to the inside of the fixing plate (401) via threads, and the other end of the push rod (402) is rotatably connected to a bending clamping seat (403); The top of the extrusion platform (2) is provided with a slide groove (404) at positions on both sides of the bending seat (403), a positioning rod (405) is clamped inside the slide groove (404), a slide plate (406) is movably sleeved on the outside of the positioning rod (405), a rotating seat (407) is rotatably connected to one side of the top of the slide plate (406), a clamping ring (408) is clamped at the top of the rotating seat (407), a rotating cylinder (409) is rotatably connected to the inner wall of the clamping ring (408), a screw rod (410) is connected to the inside of the rotating cylinder (409) via a thread, a clamping block (411) is clamped at the other end of the screw rod (410), and a telescopic sleeve rod (412) is symmetrically clamped at one end of the clamping block (411); One end of the clamping ring (408) is rotatably connected to a rotating ring (413), one end of the rotating ring (413) is clamped with a driving gear ring (414), and the outer side of the rotating cylinder (409) is fixedly sleeved with a driven gear ring (415); A vertical plate (416) is clamped at the other side of the top of the two slide plates (406), and a push rack (417) is clamped at one end of the two vertical plates (416). A movable rod (418) is equidistantly connected inside the push rack (417), and a punching plate (419) is clamped at one end of the movable rod (418). A support spring (420) is clamped at the outer position of the movable rod (418) between the punching plate (419) and the push rack (417). A mounting rack (421) is equidistantly connected at a position on one side of the push rack (417) at the top of the extrusion platform (2), and a hydraulic push rod (422) is installed inside the mounting rack (421).

3. The method for preparing a seamless thermal insulation elbow of high-density polyethylene according to claim 2, characterized in that: The bottom end of the bending seat (403) is slidably connected to the top end of the extrusion platform (2), the outer side of the slide plate (406) is slidably connected to the inner wall of the slide groove (404), the other end of the push rod (402) is clamped with a turntable, the clamping block (411) is arc-shaped, the other end of the telescopic sleeve rod (412) is connected to the inner wall of the clamping ring (408), the axes of the two clamping rings (408) correspond to each other, and the active gear ring (414) and the driven gear ring (415) are meshed with each other.

4. The method for preparing a seamless thermal insulation elbow of high-density polyethylene according to claim 2, characterized in that: The curvatures of the punching plate (419) and the bending seat (403) are equal to the curvature of the annular bracket (1); the hydraulic push rod (422) is powered by an external power supply, and the other end of the hydraulic push rod (422) is connected to one end of the pushing frame (417).

5. The method for preparing a seamless thermal insulation elbow of high-density polyethylene according to claim 2, characterized in that: A spraying and traction cutting mechanism (5) is provided at a position on the top of the annular support (1) close to one side of the extruder (3), and the spraying and traction cutting mechanism (5) comprises an arc-shaped water tank (501); An arc-shaped water tank (501) is installed at the bottom end of the annular support (1) near one side of the extruder (3); an arc-shaped channel (502) is clamped at the top end of the arc-shaped water tank (501); a water flow transfer box (503) is clamped at the top end of the arc-shaped channel (502); and a spray pipe (504) is clamped at an equal distance at the bottom end of the water flow transfer box (503); a water pump (505) is clamped at one end of the arc-shaped water tank (501) and one end of the water flow transfer box (503); and a water pump (506) is installed on the outside of the water pump (505); An annular extrusion tube (507) is clamped at one end of the extruder (3) at a position inside the arc-shaped channel (502), and an arc-shaped baffle (508) is symmetrically clamped at the other end of the annular extrusion tube (507); A transverse frame (509) is equidistantly connected to the top of the inner part of the arc-shaped channel (502); an adjusting rod (510) is symmetrically rotatably connected to the inner wall of the transverse frame (509); an adjusting block (511) is symmetrically sleeved on the outer side of the adjusting rod (510) via a thread; a traction roller (513) is rotatably connected to the bottom end of the adjusting block (511); a support ring (512) is sleeved on the outer side of the traction roller (513) via a thread; and micro motors (514) are installed on the tops of the adjusting blocks (511) located on the same side; A gantry (515) is clamped at a position on one side of the arc-shaped channel (502) corresponding to the top of the annular bracket (1), an electric push rod (516) is symmetrically clamped inside the gantry (515), a lifting frame (517) is connected to the bottom end of the electric push rod (516) via a thread, a rotating motor (518) is connected to one end of the lifting frame (517) via a thread, and a cutting disc (519) is clamped to one end of the output shaft of the rotating motor (518).

6. The method for preparing a seamless thermal insulation elbow of high-density polyethylene according to claim 5, characterized in that: The arc-shaped water tank (501) is filled with cooling water. The arcs of the arc-shaped water tank (501) and the arc-shaped channel (502) are equal to the arc of the annular support (1). The water pump (506) is powered by an external electric motor. A connecting groove is provided at the top of the annular support (1) corresponding to the bottom of the arc-shaped channel (502). The arcs of the annular extrusion tube (507) and the arc-shaped baffle (508) are equal to the arc of the arc of the arc channel (502).

7. The method for preparing a seamless thermal insulation elbow of high-density polyethylene according to claim 5, characterized in that: The outer side of the adjustment block (511) is slidably connected to the inner wall of the horizontal frame (509), the threads at the two outer ends of the adjustment rod (510) rotate in opposite directions, the outer side of the lifting frame (517) is slidably connected to the inner wall of the gantry (515), and the micro motor (514), the electric push rod (516) and the rotating motor (518) are all powered by an external power supply.

8. The method for preparing a seamless thermal insulation elbow of high-density polyethylene according to claim 2, characterized in that: A clamping assembly mechanism (6) is provided at the middle position of the top end of the annular bracket (1), and the clamping assembly mechanism (6) comprises a pad (601); A backing plate (601) is slidably connected to the middle of the top of the annular support (1), a semi-ring frame (602) is installed on the top of the backing plate (601), a fixing ring (603) is symmetrically clamped on the inner wall of the semi-ring frame (602), and a movable ring (604) is equidistantly connected to the two fixing rings (603) inside the semi-ring frame (602), and the outer side of the movable ring (604) is symmetrically connected to a positioning pin (605) through a thread, and a positioning hole (606) is opened on the outer side of the semi-ring frame (602) at a position corresponding to the outer side of the positioning pin (605); Both ends of the fixed ring (603) and the movable ring (604) are rotatably connected to a push rod (607), the other end of the push rod (607) is rotatably connected to an arc-shaped clamping plate (608), and one end of the arc-shaped clamping plate (608) is clamped with an anti-deflection rod (609) at a position corresponding to the bottom of the push rod (607).

9. The method for preparing a seamless thermal insulation elbow of high-density polyethylene according to claim 8, characterized in that: The curvature of the pad (601) is equal to that of the annular bracket (1); the outer side of the positioning pin (605) is adjacent to the inner wall of the positioning hole (606) via a thread; the outer side of the movable ring (604) is slidably connected to the inner wall of the semi-ring bracket (602); the tops of the fixed ring (603) and the movable ring (604) are both provided with notches; the inner walls of the fixed ring (603) and the movable ring (604) are both slidably connected to the outer side of the anti-deflection rod (609).

10. A seamless thermal insulation elbow made of high-density polyethylene, characterized in that: A seamless thermal insulation bend pipe used in the method for preparing a seamless thermal insulation bend pipe of high-density polyethylene as described in any one of claims 1-9.

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