A thermal insulation pipe forming machine, production line and production process

Abstract

The present invention provides a thermal insulation pipe forming machine, a production line and a production process, which belong to the technical field of plastic pipe extrusion molding, including: a core shaft for forming an inner and outer double-layer tube structure of an inner tube and a protective sleeve, the core shaft is provided with a center hole for the inner tube to pass through along its own axial direction, the outer peripheral surface of the core shaft is provided with a forming peripheral surface for spirally winding a strip of material thereon and continuously forming a protective sleeve portion, the core shaft has a solid part located between the forming peripheral surface and the center hole and used to separate the protective sleeve portion and the inner tube to form a foaming molding space; the beneficial effect of the present invention is: the protective sleeve is formed on the forming peripheral surface of the core shaft by spiral winding, and a foaming molding space is formed between the inner tube and the protective sleeve, and when the inner tube and the protective sleeve are continuously conveyed, the foaming material can be injected into the foaming molding space through the core shaft, thereby realizing continuous foaming molding and continuous production of thermal insulation pipes.

Description

Technical Field

[0001] The invention belongs to the technical field of plastic pipe extrusion molding, relates to a thermal insulation pipe molding machine, a thermal insulation pipe production line with the molding machine, and a thermal insulation pipe production process. Background Art

[0002] Insulated pipe is a composite pipe that can maintain the temperature of the conveying medium. Its structure roughly includes an inner pipe for conveying the medium, a sheath pipe for protection, and an insulation layer filled between the inner pipe and the sheath pipe. Among them, polyurethane insulated plastic composite pipe (i.e. polyurethane insulated pipe) is the most typical insulation pipe. The inner pipe and the sheath pipe serve as the inner and outer layers of the insulation pipe, and the polyurethane foam material is filled between the plastic inner pipe and the plastic sheath pipe to play an insulation role.

[0003] The existing manufacturing method of polyurethane thermal insulation plastic composite pipe is a fixed-length production. During the production process, the inner tube (working tube) is placed into the core of the sheath tube, and then the two ends of the inner tube and the sheath tube are sealed, and injection holes are drilled on the surface of the sheath tube. Then, the mixed polyurethane foaming raw materials are injected into the gap between the inner tube and the sheath tube through the injection holes. The polyurethane foaming process is carried out between the inner tube and the sheath tube; among them, the polyurethane foaming adopts a fixed-length foaming process, and the polyurethane foaming process requires a certain amount of time, so it will bring about problems such as unstable output and quality, low production efficiency, large production area, and emission of toxic gases from chemical reactions. The continuous foaming process can solve the above problems.

[0004] The main reason why a continuous foaming process cannot be used in the production of polyurethane thermal insulation plastic composite pipes is that it is impossible to inject polyurethane foaming raw materials between the inner pipe and the sheath pipe while the inner pipe is installed in the sheath pipe and the two are continuously transported. The existing technology also lacks equipment, production lines and methods that can achieve the above purpose. Summary of the Invention

[0005] The purpose of the present invention is to solve the above problems existing in the prior art, and to provide a thermal insulation pipe forming machine, a production line and a production process.

[0006] The objectives of the present invention can be achieved through the following technical solutions: A thermal insulation pipe forming machine, comprising: a core shaft for forming an inner and outer double-layer tube structure of an inner tube and a protective sleeve, the core shaft is provided with a center hole along its own axial direction for the inner tube to pass through, the outer peripheral surface of the core shaft is configured to be used for spirally winding the strip thereon and continuously forming a forming peripheral surface of the protective sleeve portion, the core shaft has a solid portion located between the forming peripheral surface and the center hole and used to be separated between the protective sleeve portion and the inner tube to form a foaming molding space.

[0007] Preferably, the sheath tube portion on the molding surface is continuously molded and separated from the molding surface and continuously transported along a preset direction at the same rate together with the inner tube, and the foaming material passes through the core shaft and is injected into the foaming molding space between the continuously transported sheath tube and the inner tube for continuous foaming.

[0008] Preferably, the solid part has a rear end face, and the solid part is provided with at least one pouring pipe, one end of which is provided as a pouring port for injecting foaming material into the foaming molding space between the continuously conveyed inner tube and the sheath tube, and the pouring port extends a preset distance from the rear end face.

[0009] Preferably, it also includes a winding molding mechanism, which includes a hollow turntable for spirally winding the strip material on the molding surface by rotation, the axis of the hollow turntable is coaxially arranged with the axis of the core shaft, and the hollow turntable can rotate around the axis of the core shaft.

[0010] Preferably, the end surface of the hollow turntable is equipped with at least one set of guide wheels for guiding the strip material to be wound onto the forming circumference.

[0011] Preferably, a splicing element for fixing adjacent strips wound on the forming circumferential surface together to form a sheath tube portion is installed on the end surface of the hollow turntable, and the splicing element is close to the forming circumferential surface.

[0012] Preferably, the splicing element is configured as a laser welding device, an electric welding device, an ultrasonic welding device, or a gas welding device for welding adjacent strips on the forming circumferential surface together by welding.

[0013] Preferably, at least one set of pressing wheels for flattening the weld seam of the sheath pipe is installed on the end surface of the hollow turntable, and the pressing wheels are close to the forming circumferential surface.

[0014] Preferably, the pressing wheel is configured as a metal wheel structure for cooling the jacket pipe portion when flattening the weld.

[0015] Preferably, a preheating element is installed on the end surface of the hollow turntable for preheating the strip before the strip is wound around the forming surface.

[0016] Preferably, the forming circumferential surface is provided with a baffle which surrounds the forming circumferential surface and is used to limit the strip material wound on the forming circumferential surface from moving in a direction opposite to the conveying direction of the inner tube.

[0017] Preferably, the winding forming mechanism further includes a main shaft, the hollow turntable is fixedly connected to the main shaft and the two are coaxially arranged, and when the main shaft rotates, the hollow turntable is driven to rotate.

[0018] Preferably, the main shaft is configured as a hollow structure and an inner hole for the inner tube and the sheath tube to pass through is provided at the center of the main shaft.

[0019] Preferably, the winding and forming mechanism further comprises a tape storage reel capable of storing at least one reel of tape and releasing the tape by rotation, and the tape storage reel is rotatably sleeved on the main shaft.

[0020] Preferably, the winding and forming mechanism further comprises a storage reel driving element, wherein the storage reel driving element is connected to the storage reel and can drive the storage reel to rotate.

[0021] Preferably, the hollow turntable is equipped with a conveying element for assisting the conveying of the tape on the tape storage disk to the guide wheel.

[0022] Preferably, the winding forming mechanism further includes a main shaft driving element, which is connected to the main shaft and can drive the main shaft to rotate.

[0023] Preferably, a conductive ring for power supply is provided on the main shaft.

[0024] Preferably, it also includes a stent conveying mechanism for conveying the stent to the foaming molding space so that the inner tube and the sheath tube remain concentric. The stent conveying mechanism, the core shaft and the winding molding mechanism are arranged in sequence. The stent conveying mechanism includes a first mounting seat and a pushing assembly for intermittently conveying the stent to the foaming molding space. The first mounting seat is provided with a through hole for the inner tube to pass through, and the through hole is coaxial with the center hole. The pushing assembly is installed on the first mounting seat.

[0025] Preferably, the core shaft is provided with an avoidance hole along its axial direction for allowing the bracket to pass through the core shaft.

[0026] Preferably, the pushing assembly includes a first pushing element for pushing the bracket to align with the avoidance hole and a second pushing element for pushing the bracket along the avoidance hole through the core shaft and into the foaming molding space.

[0027] Preferably, it further includes a second mounting seat, the core shaft is detachably connected to the second mounting seat, and the bracket conveying mechanism also includes a displacement driving element, the first mounting seat is connected to the displacement driving element and the displacement driving element can drive the first mounting seat to approach or move away from the second mounting seat.

[0028] A production line is also provided for producing thermal insulation pipes, including the thermal insulation pipe forming machine, a traction machine for pulling the inner pipe and the sheath pipe from front to back, and a foaming device for providing foaming material. The bracket conveying mechanism, the core shaft, the winding forming mechanism and the traction machine are arranged in sequence from front to back, and the foaming device is connected to the casting pipe on the solid part of the core shaft.

[0029] Preferably, it also includes a preheating device for preheating the formed sheath pipe, a covering mold for covering the outer tube outside the sheath pipe, and a cooling device for cooling and shaping the insulating pipe covered with the outer tube. The preheating device, the covering mold and the cooling device are arranged in sequence from front to back between the winding forming mechanism and the traction machine.

[0030] Preferably, it further comprises a corona machine for roughening the outer surface of the inner tube before treatment, and the corona machine is arranged in front of the stent conveying mechanism.

[0031] Preferably, it further comprises a retarder for controlling the tension of the inner tube, wherein the retarder is arranged in front of the corona machine.

[0032] Preferably, it further comprises an unwinder for releasing the inner tube and a rewinder for rewinding the heat-insulating pipe, wherein the unwinder is located in front of the blocking machine and the rewinder is located behind the cooling device.

[0033] A production process is also provided for continuously producing thermal insulation pipes, comprising the following steps:

[0034] S1: The inner tube passes through the center hole of the core shaft, and the main shaft drives the hollow turntable to rotate. The tape storage disk rotates on the main shaft and releases the tape. The tape is then led to the guide wheel of the hollow turntable. The rotating hollow turntable spirally winds the tape around the forming surface of the core shaft to form a jacket tube portion. The inner tube in the center hole and the formed jacket tube portion form an inner and outer double-layer tube structure, and a foaming molding space for filling with foaming material is formed between the inner tube and the jacket tube.

[0035] S2: The hollow turntable drives the splicing element to rotate around the jacket tube portion on the forming surface, thereby welding the adjacent strips wrapped around the forming surface together. The hollow turntable drives the pressing wheel to roll on the outer circumference of the jacket tube to flatten and cool the weld;

[0036] S3: The stent conveying mechanism intermittently conveys the stents into the foam molding space. The first pushing element pushes the stents to align with the avoidance hole, and the second pushing element pushes the stents through the core shaft and into the foam molding space. The stents move synchronously from front to back along with the inner tube and the sheath tube. After synchronous movement for a certain distance, the stent conveying mechanism conveys the next group of stents.

[0037] S4: While the front portion of the jacket tube is continuously being formed, the rear portion of the jacket tube is separated from the molding surface and conveyed backward at the same rate as the inner tube. Since the pouring port extending from the rear end face of the mandrel corresponds to the foaming molding space, the foaming device can inject the prepared foaming material into the pouring pipe and inject it from the pouring port into the foaming molding space between the continuously conveyed inner tube and the jacket tube. As the inner tube and the jacket tube are continuously conveyed backward, the foaming material is continuously solidified and shaped in the foaming molding space to form a thermal insulation layer.

[0038] S5: The insulated pipe passing through the insulated pipe forming machine is preheated by the preheating device and then enters the covering mold. When passing through the die mouth of the covering mold, the insulated pipe is covered with a layer of outer tube outside the jacket tube, and then enters the cooling device to be quickly shaped and pulled out at a uniform speed.

[0039] Preferably, in step S3, the inner tube needs to enter a corona machine for surface pre-treatment before entering the stent delivery mechanism.

[0040] Preferably, the belt material is a plastic belt, and the foaming material is a polyurethane foaming material.

[0041] Preferably, the strip is made of transparent plastic, so when the strip is spirally wound around the molding surface of the core shaft, a transparent sheath tube can be formed. Personnel can observe the actual foaming, curing and shaping process of the polyurethane foam material in the foaming molding space through the transparent sheath tube, and thus adjust the foaming parameters according to actual conditions.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] 1. A sheath tube is formed on the forming surface of the core shaft by spiral winding, and a foaming molding space is formed between the inner tube and the sheath tube. When the inner tube and the sheath tube are continuously conveyed, the foaming material can be injected into the foaming molding space through the core shaft, thereby realizing continuous foaming molding and continuous production of thermal insulation pipes.

[0044] 2. The rear end face of the solid part is always located in the foaming molding space, while the front end face of the solid part is always located outside the pipe. The pouring pipe can pass through the solid part from the front end face and extend from the rear end face. After the foaming material is injected into the pouring pipe, it is injected into the foaming molding space from the pouring port. Therefore, foaming can be carried out continuously during the continuous backward transportation of the inner pipe and the sheath pipe, and the pouring pipe will not interfere with the moving inner pipe and the sheath pipe.

[0045] 3. The hollow turntable can drive the laser welding head to move around the forming surface, so that the laser welding head can weld along the joint seam of the strip and achieve the purpose of welding while winding. After winding and welding, the strip forms a sheath tube, and the sheath tube will not fall apart after it is separated from the core shaft.

[0046] 4. The tape storage disk is rotatably arranged on the main shaft, and the rotation speed of the tape storage disk can be adjusted so that the length of the tape released by the tape storage disk is exactly equal to the length of the tape wound around the forming surface by the hollow turntable in the same time.

[0047] 5. Under the traction of the traction machine, the inner tube passes through the bracket conveying mechanism, the core shaft, and the winding molding mechanism in sequence, so as to convey the bracket and the molded jacket tube on the outer tube, and the foaming device continuously injects the foaming material into the foaming molding space through the pouring pipe. The injection, foaming and shaping and curing of the foaming material are also completed in the process of moving the inner tube and the jacket tube, which greatly improves the production efficiency of the insulation pipe and realizes the continuous foaming of the insulation pipe in a pioneering way. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a structural schematic diagram of the thermal insulation pipe forming machine of the present invention.

[0049] Figure 2 It is a schematic diagram of the positions of the core shaft, inner tube and sheath tube of the present invention.

[0050] Figure 3 It is a structural schematic diagram of the winding forming mechanism of the present invention.

[0051] Figure 4 It is a structural schematic diagram of the core shaft of the present invention.

[0052] Figure 5 for Figure 2 AA cross-sectional diagram of .

[0053] Figure 6 It is a schematic diagram of the winding forming mechanism of the present invention when the sheath tube is formed by winding the strip.

[0054] Figure 7 It is a structural schematic diagram of the production line of the present invention.

[0055] Figure 8A Schematic diagram of the thermal insulation pipe of the present invention having three supports in cross section.

[0056] Figure 8B Schematic diagram of the thermal insulation pipe of the present invention having four supports in the cross section.

[0057] Figure 8C It is a cross-sectional schematic diagram of the present invention when the outer tube is wrapped around the sheath tube.

[0058] In the figure, 100, core shaft; 110, center hole; 120, molding surface; 121, baffle; 130, solid part; 131, avoidance hole; 140, rear end surface; 150, pouring pipe; 151, pouring gate; 160, second mounting seat; 200, hollow turntable; 210, guide wheel; 220, splicing element; 230, pressure wheel; 240, preheating element; 250, conveying element; 300, main shaft; 310, inner hole; 320, main shaft driving element; 330, conductive ring; 400, storage reel; 410, storage reel driving element; 500, bracket conveying mechanism; 51 0. First mounting seat; 511. Through hole; 520. First pushing element; 530. Second pushing element; 540. Displacement driving element; 600. Unwinder; 700. Retarder; 800. Corona machine; 900. Foaming device; 1000. Preheating device; 1100. Coating mold; 1200. Cooling device; 1300. Tractor; 1400. Winder; 1500. Inner tube; 1600. Sheath tube; 1610. Sheath tube portion; 1700. Foaming molding space; 1800. Bracket; 1900. Belt; 2000. Insulation layer; 2100. Outer tube. DETAILED DESCRIPTION

[0059] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0060] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0061] In addition, in the present invention, descriptions such as "first," "second," and "one" are for descriptive purposes only and should not be understood to indicate or imply their relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0062] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0063] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0064] Example 1:

[0065] like Figure 1-6 、 Figure 8A 、 Figure 8B As shown, a thermal insulation pipe forming machine includes: a core shaft 100 for forming an inner and outer double-layer tube structure of an inner tube 1500 and a protective sleeve 1600, the core shaft 100 is provided with a center hole 110 along its own axial direction for the inner tube 1500 to pass through, the outer peripheral surface of the core shaft 100 is provided with a forming peripheral surface 120 for the strip 1900 to be spirally wound thereon and continuously form a protective sleeve portion 1610, the core shaft 100 has a solid portion 130 located between the forming peripheral surface 120 and the center hole 110 and used to be separated between the protective sleeve portion 1610 and the inner tube 1500 to form a foaming molding space 1700.

[0066] In this embodiment, the center hole 110 of the core shaft 100 is concentrically arranged with the molding circumference 120, and the center hole 110 of the core shaft 100 is used to position the inner tube 1500, and the molding circumference 120 of the core shaft 100 is used to form and position the sheath tube portion 1610. The winding molding mechanism can spirally wind the strip 1900 on the molding circumference 120, so the sheath tube portion 1610 formed by winding is concentrically arranged with the inner tube 1500 and a foaming molding space 1700 can be formed between the two; and the inner tube 1500 in the center hole 110 is continuously conveyed backward, and the front part of the sheath tube portion 1610 on the molding circumference 120 is continuously wound and molded while the rear part of the sheath tube portion 1610 is conveyed backward, so that the inner tube 1500 and the sheath tube portion 1610 are conveyed backward at the same rate and detached from the core shaft 100.

[0067] In this application, the inner tube 1500 and the sheath tube 1600 essentially refer to the tube body arranged in the inner layer and the tube body arranged in the outer layer. The inner tube 1500 can also be called the working tube, and the sheath tube 1600 can also be called the outer tube. As long as the two tubes are arranged in an inner and outer double-layer arrangement, they are within the protection range of the inner tube 1500 and the sheath tube 1600. The purpose of injecting the foaming material into the foaming molding space 1700 between the inner tube 1500 and the sheath tube 1600 is to form an insulation layer 2000.

[0068] It should also be pointed out that, since the sheath tube 1600 is continuously formed by spiral winding on the molding circumference 120, a portion of the sheath tube 1600 on the molding circumference 120 is called the sheath tube portion 1610, that is, the sheath tube portion 1610 can be regarded as the end of the entire sheath tube 1600. While the front part of the sheath tube portion 1610 on the molding circumference 120 is continuously formed, the rear part of the sheath tube portion 1610 detaches from the molding circumference 120 and moves backward. The sheath tube portion 1610 leaving the molding circumference 120 can be called the sheath tube 1600.

[0069] The sheath tube portion 1610 on the molding surface 120 is continuously molded and separated from the molding surface 120 and continuously transported along a preset direction at the same rate together with the inner tube 1500. The foaming material passes through the core shaft 100 and is injected into the foaming molding space 1700 between the continuously transported sheath tube 1600 and the inner tube 1500 for continuous foaming.

[0070] During the production of existing insulation pipes, an inner pipe of a certain length must first be concentrically arranged in a sheath pipe, and then the ends of the inner pipe and the sheath pipe are sealed before the foaming material can be injected. During this process, the inner pipe and the sheath pipe are fixed in length and cannot be moved, otherwise they will interfere with the nozzle for injecting the foaming material, so continuous production cannot be carried out.

[0071] In this embodiment, since the inner tube 1500 is continuously transported and passes through the center hole 110, the sheath tube 1600 is formed by winding on the core shaft 100, and the preset direction is from front to back. The sheath tube portion 1610 continuously moves backward and extends from the molding circumference 120, and the molded sheath tube 1600 moves together with the inner tube 1500 at the same rate. The sheath tube portion 1610 on the molding circumference 120 of the core shaft 100 can be regarded as the starting end of the sheath tube 1600, which means that the foaming material can be injected into the foaming molding space 1700 between the inner tube 1500 and the sheath tube 1600 through the solid part 130 of the core shaft 100, so that the foaming material can be continuously injected for foaming while the insulation pipe is being transported, solving the core technical problem of continuous foaming of the insulation pipe.

[0072] A sheath tube 1600 is formed on the molding circumference 120 of the core shaft 100 by spiral winding, and a foaming molding space 1700 is formed between the inner tube 1500 and the sheath tube 1600. When the inner tube 1500 and the sheath tube 1600 are continuously transported, the foaming material can pass through the core shaft 100 and be injected into the foaming molding space 1700, thereby realizing continuous foaming molding and continuous production of thermal insulation pipes.

[0073] The solid part 130 has a rear end face 140, and the solid part 130 is provided with at least one pouring pipe 150. One end of the pouring pipe 150 is configured as a pouring port 151 for injecting foaming material into the foaming molding space 1700 between the continuously conveyed inner tube 1500 and the sheath tube 1600, and the pouring port 151 extends a preset distance from the rear end face 140.

[0074] The rear end face 140 of the solid part 130 corresponds to the foaming molding space 1700 between the inner tube 1500 and the sheath tube 1600. In the actual structure, the rear end face 140 of the solid part 130 is always located in the foaming molding space 1700, and the front end face of the solid part 130 is always located outside the foaming molding space 1700. The pouring pipe 150 can pass through the solid part 130 from the front end face of the solid part 130 and extend from the rear end face 140. After the foaming material is injected into the pouring pipe 150, it is injected into the foaming molding space 1700 from the pouring port 151. Therefore, in the process of continuous backward transportation of the inner tube 1500 and the sheath tube 1600, the foaming material can be continuously injected for foaming, and the pouring pipe 150 will not interfere with the continuously transported inner tube 1500 and the sheath tube 1600.

[0075] Example 2:

[0076] like Figure 1-6 、 Figure 8A 、 Figure 8B As shown, this embodiment further discloses the winding molding mechanism in Example 1, and the winding molding mechanism includes a hollow turntable 200 for spirally winding the strip 1900 on the molding surface 120 by rotation, and the axis of the hollow turntable 200 is coaxially arranged with the axis of the core shaft 100, and the hollow turntable 200 can rotate around the axis of the core shaft 100.

[0077] In the actual structure, the core shaft 100 and the hollow turntable 200 are arranged correspondingly in front and back, and the rotating axis of the hollow turntable 200 is coaxial with the axis of the core shaft 100, so when the hollow turntable 200 rotates, it can drive the strip 1900 to wrap around the forming surface 120, and the side surfaces of adjacent strips 1900 on the forming surface 120 are tightly attached together and have a clamping force. After molding, the sheath tube 1600 and the inner tube 1500 pass through the hollow turntable 200 and move backward.

[0078] At least one set of guide wheels 210 for guiding the strip 1900 to be wound onto the forming circumferential surface 120 is installed on the end surface of the hollow turntable 200 .

[0079] It should be noted that the strip 1900 is guided to the molding surface 120 by multiple sets of guide wheels 210, and the strip 1900 is tensioned by multiple sets of guide wheels 210 so that the strip 1900 is tightly attached to the molding surface 120 under the action of controlled tension.

[0080] A splicing element 220 is installed on the end surface of the hollow turntable 200 for fixing adjacent strips 1900 wound on the forming circumferential surface 120 together to form the sheath tube portion 1610 . The splicing element 220 is close to the forming circumferential surface 120 .

[0081] After the strip 1900 is wound around the forming surface 120, in order to prevent the strip 1900 from detaching or falling apart after leaving the core shaft 100, it is necessary to fix the circles of strip 1900 wrapped around the core shaft 100 together, so a splicing element 220 is specially provided on the end face of the hollow turntable 200. The splicing element 220 can fix adjacent strips 1900 together by hot welding or applying glue.

[0082] Example 3:

[0083] like Figure 1-6 、 Figure 8A 、 Figure 8B As shown, this embodiment is an implementation of the splicing element 220 in Example 2, and the splicing element 220 is configured as a laser welding device or electric welding device or ultrasonic welding device or gas welding device that welds adjacent strips 1900 on the forming surface 120 together by welding.

[0084] The splicing element 220 welds the adjacent strips 1900 on the forming surface 120 together through the principle of welding. In the actual structure, the splicing element 220 uses laser welding equipment, wherein the laser welding head of the laser welding equipment is close to the forming surface 120 and the angle is adjustable. The hollow turntable 200 can drive the laser welding head to move around the forming surface 120, so that the laser welding head can weld along the splicing line of the strip 1900, and achieve the purpose of winding and welding at the same time. After winding and welding, the strip 1900 forms a sheath tube 1600, and the sheath tube 1600 will not fall apart after it is separated from the core shaft 100.

[0085] Example 4:

[0086] like Figure 1 、 Figure 3 、 Figure 6As shown, this embodiment is a post-processing of the sheath tube 1600 formed by welding in Example 3. The end face of the hollow turntable 200 is installed with at least one set of pressing wheels 230 for flattening the weld of the sheath tube 1600, and the pressing wheels 230 are close to the forming circumferential surface 120.

[0087] Since the sheath tube 1600 is formed by winding and welding the strip 1900, there is a spiral weld on the outside of the sheath tube 1600, and the weld is uneven. In order to make the appearance of the sheath tube 1600 smooth, a pressure wheel 230 is also required. The pressure wheel 230 is located behind the splicing element 220. After the strip 1900 is welded, the pressure wheel 230 presses on the weld to flatten the weld.

[0088] In an actual structure, there are multiple pressing wheels 230 , and the multiple pressing wheels 230 are arranged around the forming surface 120 .

[0089] Preferably, the pressing wheel 230 is configured as a metal wheel structure for cooling the jacket tube portion 1610 when flattening the weld.

[0090] Since the temperature of the strip 1900 is relatively high after welding, in order to dissipate heat to the weld and its surrounding areas, a metal pressure wheel 230 is specially used. When the pressure wheel 230 is pressed on the weld, it can achieve the effect of cooling and dissipating heat.

[0091] Embodiment 5:

[0092] like Figure 1 、 Figure 3 As shown, this embodiment is a further refinement of the second embodiment, and a preheating element 240 is installed on the end surface of the hollow turntable 200 for preheating the strip 1900 before the strip 1900 is wound around the forming circumferential surface 120 .

[0093] The preheating element 240 is preferably a hot air gun. The preheating element 240 can preheat the strip 1900 on the guide wheel 210, thereby softening the strip 1900. This allows the strip 1900 to be wound around the molding surface 120 in a relatively soft state, thereby making the strip 1900 close to the molding surface 120, thereby improving the molding effect of the sheath tube 1600.

[0094] Example 6:

[0095] like Figure 1-2 As shown, the forming circumferential surface 120 is provided with a baffle 121 which surrounds the forming circumferential surface 120 and is used to limit the strip 1900 wound on the forming circumferential surface 120 from moving in a direction opposite to the conveying direction of the inner tube 1500.

[0096] Since the sheath tube 1600 and the inner tube 1500 are transported backward, a baffle 121 needs to be set in front of the sheath tube 1600. When the strip 1900 is wound on the forming surface 120, it can only move backward under the action of the baffle 121, so that the adjacent strips 1900 are tightened.

[0097] Example 6:

[0098] like Figure 1-3 As shown, this embodiment is a further refinement of the second embodiment. The winding molding mechanism also includes a main shaft 300. The hollow turntable 200 is fixedly connected to the main shaft 300 and the two are coaxially arranged. When the main shaft 300 rotates, it drives the hollow turntable 200 to rotate.

[0099] The winding forming mechanism further includes a main shaft driving element 320 , which is connected to the main shaft 300 and can drive the main shaft 300 to rotate.

[0100] The hollow turntable 200 is fixed on the front end face of the main shaft 300, and the main shaft 300 is used to drive the hollow turntable 200 to rotate. The main shaft driving element 320 is a main shaft driving motor, which drives the main shaft 300 to rotate through the main shaft driving motor and the reducer, thereby driving the hollow turntable 200 to rotate.

[0101] The main shaft 300 is configured as a hollow structure, and an inner hole 310 is provided at the center of the main shaft 300 for the inner tube 1500 and the sheath tube 1600 to pass through.

[0102] In order to meet the needs of continuous production of thermal insulation pipes, the inner tube 1500 passing through the center hole 110 of the core shaft 100 and the sheath tube part 1610 wrapped around the forming circumference 120 are continuously transported backward. The inner tube 1500 and the sheath tube 1600 transported backward pass through the turntable hole of the hollow turntable 200 and then pass into the inner hole 310 of the main shaft 300, and pass out from the inner hole 310, thereby realizing the continuous transportation of the thermal insulation pipe.

[0103] Embodiment seven:

[0104] like Figure 1-3 、 Figure 6 As shown, this embodiment is a further refinement of the sixth embodiment, wherein the winding forming mechanism further includes a storage reel 400 that can store at least one reel of tape 1900 and release the tape 1900 by rotation, and the storage reel 400 is rotatably mounted on the main shaft 300.

[0105] The tape storage tray 400 is used to store reels of tape 1900. The tape 1900 is preferably a long plastic tape. The tape storage tray 400 can transport the tape 1900 to the hollow turntable 200 by rotation, thereby continuously forming the sheath tube 1600. It should be noted that, in the actual structure, multiple reels of tape 1900 can be stored on the tape storage tray 400, and the multiple reels of tape 1900 are arranged along the axial direction of the main shaft 300.

[0106] It should be noted that the strip 1900 cannot be directly set on the main shaft 300, but must be set on a storage reel 400 that can rotate relative to the main shaft 300. Due to radius reasons, the length of the strip 1900 released by one reel of strip 1900 rotating one circle is different from the length of the strip 1900 wound on the forming surface 120 by the hollow turntable 200 rotating one circle. The storage reel 400 is rotatably set on the main shaft 300, and the rotation speed of the storage reel 400 can be adjusted so that the length of the strip 1900 released by the storage reel 400 is exactly equal to the length of the strip 1900 wound on the forming surface 120 by the hollow turntable 200 within the same time.

[0107] The winding and forming mechanism further includes a storage reel driving element 410 , which is connected to the storage reel 400 and can drive the storage reel 400 to rotate.

[0108] The storage reel driving element 410 is preferably a storage reel driving motor, which can drive the storage reel 400 to rotate on the spindle 300 .

[0109] The hollow turntable 200 is equipped with a conveying element 250 for assisting the strip material 1900 on the storage disc 400 to be conveyed to the guide wheel 210. The conveying element 250 is preferably a conveying motor, which can assist the strip material 1900 to be conveyed to the guide wheel 210.

[0110] Embodiment 8:

[0111] like Figure 1 、 Figure 3 As shown, this embodiment is a further refinement of the seventh embodiment. A conductive ring 330 for power supply is provided on the spindle 300. Since the spindle 300 rotates and a large number of electrical devices are located on the hollow turntable 200, the conductive ring 330 is provided on the spindle 300 to facilitate power supply. Electrical devices (such as the laser welding equipment and the preheating element 240) and the storage reel drive motor can be electrically connected to the conductive ring 330 via brushes, thereby drawing power while the spindle 300 rotates.

[0112] Embodiment 9:

[0113] like Figure 1-2 、 Figure 5 、 Figures 8A-8B It is shown that the thermal insulation pipe forming machine also includes a bracket conveying mechanism 500 for conveying the bracket 1800 to the foaming molding space 1700 so that the inner tube 1500 and the sheath tube 1600 remain concentric. The bracket conveying mechanism 500, the core shaft 100 and the winding molding mechanism are arranged in sequence. The bracket conveying mechanism 500 includes a first mounting seat 510 and a pushing assembly for intermittently conveying the bracket 1800 to the foaming molding space 1700. The first mounting seat 510 is provided with a through hole 511 for the inner tube 1500 to pass through. The through hole 511 is coaxial with the center hole 110, and the pushing assembly is installed on the first mounting seat 510.

[0114] The core shaft 100 is provided with an avoidance hole 131 along its axial direction for the bracket 1800 to pass through the core shaft 100 .

[0115] The pushing assembly includes a first pushing element 520 for pushing the bracket 1800 to align with the avoidance hole 131 and a second pushing element 530 for pushing the bracket 1800 along the avoidance hole 131 through the core shaft 100 and into the foaming molding space 1700 .

[0116] Before the inner tube 1500 enters the center hole 110 of the core shaft 100, it needs to pass through the bracket conveying mechanism 500. The bracket conveying mechanism 500 can automatically and intermittently convey the bracket 1800 to the foaming molding space 1700. Each group of brackets 1800 is spaced a certain distance apart in the axial direction of the inner tube 1500. The bracket 1800 is supported between the inner tube 1500 and the sheath tube 1600 to play a supporting role, ensuring that the inner tube 1500 and the sheath tube 1600 remain concentric and ensuring the stability of the foaming molding space 1700.

[0117] In the actual structure, the first mounting seat 510 and the core shaft 100 are connected through a bracket guide groove, and the bracket guide groove is aligned with the avoidance hole 131 on the core shaft 100. The bracket guide groove can prevent the bracket 1800 from falling during the process of moving from the first mounting seat 510 to the avoidance hole 131. The first pushing element 520 and the second pushing element 530 are both configured as cylinders. The first pushing element 520 can push the bracket 1800 onto the bracket guide groove and align it with the avoidance hole 131. The second pushing element 530 pushes the bracket 1800 along the bracket guide groove into the avoidance hole 131 and passes through the core shaft 100 so that the bracket 1800 enters the foaming molding space 1700.

[0118] It should also be noted that the entire working process of the insulation pipe forming machine is basically completed automatically. The insulation pipe is continuously transported backward at a predetermined rate under the action of the traction machine 1300, thereby driving the inner pipe 1500 through the bracket conveying mechanism 500. The bracket conveying mechanism 500 can automatically convey the bracket 1800 to the foaming molding space 1700. The core shaft 100 and the winding molding mechanism can automatically wrap the outer side of the inner pipe 1500 to form a sheath tube 1600, and weld the sheath tube 1600. The pouring pipe 150 can automatically fill the foaming material in the foaming molding space 1700, thereby achieving the purpose of continuous foaming. Therefore, the degree of automation is high, which greatly improves the production efficiency of the insulation pipe.

[0119] Embodiment 10:

[0120] like Figure 1-2 As shown, this embodiment further defines the ninth embodiment, and the thermal insulation pipe forming machine also includes a second mounting seat 160, and the core shaft 100 is detachably connected to the second mounting seat 160. The bracket conveying mechanism 500 also includes a displacement driving element 540, and the first mounting seat 510 is connected to the displacement driving element 540 and the displacement driving element 540 can drive the first mounting seat 510 to approach or move away from the second mounting seat 160.

[0121] Since there are many models of insulation pipes, when producing insulation pipes of different models, the corresponding core shaft 100 needs to be replaced due to the different sizes of the corresponding inner tubes 1500. At this time, the core shaft 100 can be removed from the second mounting seat 160 and replaced with a new core shaft 100. Since the first mounting seat 510 is very close to the second mounting seat 160, when replacing the core shaft 100, the first mounting seat 510 is driven away from the second mounting seat 160 by moving the driving element (i.e., a cylinder or linear motor or hydraulic cylinder) to facilitate the replacement of the core shaft 100.

[0122] Example 11:

[0123] like Figure 1-7 As shown, a production line is also provided for producing thermal insulation pipes, including the thermal insulation pipe forming machine, and also includes a traction machine 1300 for pulling the inner pipe 1500 and the sheath pipe 1600 from front to back and a foaming device 900 for providing foaming material. The bracket conveying mechanism 500, the core shaft 100, the winding forming mechanism and the traction machine 1300 are arranged in sequence from front to back, and the foaming device 900 is connected to the casting pipe 150 on the solid part 130 of the core shaft 100.

[0124] In this embodiment, the thermal insulation pipe (inner pipe 1500, jacket pipe 1600 and insulation layer 2000) is continuously transported backward by the traction machine 1300, wherein the inner pipe 1500 is pulled by the traction machine 1300 and passes through the bracket conveying mechanism 500, the core shaft 100, and the winding molding mechanism in sequence, thereby conveying the bracket 1800 and the molded jacket pipe 1600 on the inner pipe, and the foaming device 900 continuously injects the foaming material into the foaming molding space 1700 through the pouring pipe 150. The filling, foaming and shaping and curing of the foaming material are also completed in the process of moving the inner pipe 1500 and the jacket pipe 1600, which greatly improves the production efficiency of the thermal insulation pipe and pioneeringly realizes the continuous foaming of the thermal insulation pipe.

[0125] Among them, the foaming device 900 and the foaming material are existing technologies and will not be described in detail here. The foaming material can be any existing material that can form the insulation layer 2000 through foaming.

[0126] Example 12:

[0127] like Figure 1-8C As shown, this embodiment is a further refinement of the eleventh embodiment, and the production line also includes a preheating device 1000 for preheating the formed sheath tube 1600, a covering mold 1100 for covering the outer tube 2100 outside the sheath tube 1600, and a cooling device 1200 for cooling and shaping the heat-insulating pipe covered with the outer tube 2100. The preheating device 1000, the covering mold 1100 and the cooling device 1200 are arranged in sequence from front to back between the winding forming mechanism and the traction machine 1300.

[0128] Since the sheath tube 1600 is formed by spirally winding the strip 1900 and welding, there are obvious welds on the outer surface of the sheath tube 1600 and it is uneven. In order to make the surface of the sheath tube 1600 smooth, it is necessary to use a covering mold 1100 to cover the sheath tube 1600 with a layer of plastic outer tube 2100, so that the surface of the entire insulation pipe is smooth and beautiful. The covering mold 1100 is used to wrap plastic on the surface of the sheath tube 1600 passing through the mold mouth to form an outer tube 2100, and the cooling device 1200 is preferably a spray cooling device 1200.

[0129] The production line also includes a corona machine 800 for roughening the outer surface of the inner tube 1500. The corona machine 800 is positioned in front of the stent conveying mechanism. This roughening process allows the foaming material to better bond to the inner tube 1500 surface.

[0130] The production line further includes a retarder 700 for controlling the tension of the inner tube 1500, which is disposed in front of the corona machine 800. The retarder 700 can apply a certain retarding force to the inner tube 1500 to prevent the inner tube 1500 from moving without being pulled.

[0131] The production line further includes an unwinder 600 for releasing the inner tube 1500 and a rewinder 1400 for rewinding the insulation pipe. The unwinder 600 is located in front of the blocking machine 700 , and the rewinder 1400 is located behind the cooling device 1200 .

[0132] It should be noted here that since the insulated pipes can be produced continuously during production in this embodiment, the inner pipe 1500 needs to be continuously delivered to the production process through the unwinder 600, and the produced insulated pipes need to be continuously wound up through the winder 1400. During the entire production process, the insulated pipes keep moving at a certain rate.

[0133] Example 13:

[0134] like Figure 1-8C As shown, a production process is also provided for continuously producing thermal insulation pipes, including the following steps:

[0135] S1: The inner tube 1500 passes through the center hole 110 of the core shaft 100, the main shaft 300 drives the hollow turntable 200 to rotate, the tape storage disk 400 rotates on the main shaft 300 and releases the strip 1900, which is then guided to the guide wheel 210 of the hollow turntable 200. The rotating hollow turntable 200 spirally winds the strip 1900 around the molding surface 120 of the core shaft 100, thereby forming a sheath tube portion 1610. The inner tube 1500 in the center hole 110 and the molded sheath tube portion 1610 form an inner and outer double-layer tube structure, and a foaming molding space 1700 for filling with foaming material is formed between the inner tube 1500 and the sheath tube 1600.

[0136] S2: The hollow turntable 200 drives the splicing element 220 to rotate around the jacket tube portion 1610 on the forming circumferential surface 120, thereby welding the adjacent strips 1900 wrapped around the forming circumferential surface 120 together. The hollow turntable 200 drives the pressing wheel 230 to roll on the outer circumference of the jacket tube 1600, thereby flattening and cooling the weld.

[0137] S3: The stent conveying mechanism 500 intermittently conveys the stents 1800 into the foam molding space 1700. The first pushing element 520 pushes the stents 1800 to align with the avoidance hole 131. The second pushing element 530 pushes the stents 1800 through the core shaft 100 and into the foam molding space 1700. The stents 1800 move synchronously with the inner tube 1500 and the sheath tube 1600 from front to back. After synchronous movement for a certain distance, the stent conveying mechanism 500 conveys the next group of stents 1800.

[0138] S4: While the front portion of the jacket tube portion 1610 is continuously being formed, the rear portion of the jacket tube portion 1610 is separated from the molding circumferential surface 120 and conveyed backward at the same rate as the inner tube 1500. Since the pouring port 151 extending from the rear end surface 140 of the core shaft 100 corresponds to the foaming molding space 1700, the foaming device 900 can inject the prepared foaming material into the pouring pipe 150 and inject it from the pouring port 151 into the foaming molding space 1700 between the continuously conveyed inner tube 1500 and the jacket tube 1600. While the inner tube 1500 and the jacket tube 1600 are continuously conveyed backward, the foaming material is continuously solidified and shaped in the foaming molding space 1700 to form the thermal insulation layer 2000.

[0139] S5: The insulated pipe passing through the insulated pipe forming machine is preheated by the preheating device 1000 and then enters the covering mold 1100. When passing through the die mouth of the covering mold 1100, the insulated pipe is covered with a layer of outer tube 2100 outside the sheath tube 1600, and then enters the cooling device 1200 to be quickly shaped and pulled out at a uniform speed.

[0140] In this embodiment, the essence of the production method is that the sheath tube portion 1610 is the front end portion of the entire sheath tube 1600, and the sheath tube portion 1610 is continuously formed and conveyed backward, that is, the front end portion of the sheath tube 1600 (sheath tube portion 1610) is continuously wound around the molding circumference 120 by the strip 1900, which provides a basis for continuous foaming; because the inner tube 1500 passes through the center hole 110 of the core shaft 100, the strip 1900 is spirally wound around the molding circumference 120 of the core shaft 100 and is formed by welding. The sheath tube 1600, so the sheath tube part 1610 is continuously formed and also transported backward. For the sheath tube 1600 as a whole, the sheath tube part 1610 is always located on the molding circumference 120, so the pouring pipe 150 can be inserted into the solid part 130 and extended from the rear end face 140, so that the pouring port 151 is located in the foaming molding space 1700. The foaming device 900 continuously fills the foaming molding space 1700 with foaming material while the inner tube 1500 and the sheath tube 1600 are transported backward for continuous foaming.

[0141] Preferably, in step S3, the inner tube 1500 needs to enter the corona machine 800 for surface pre-treatment before entering the stent delivery mechanism 500.

[0142] It should be noted here that, in each of the above embodiments, the strip 1900 is a plastic strip, and the foaming material is a polyurethane foaming material.

[0143] Preferably, the strip 1900 is made of transparent plastic, so when the strip 1900 is spirally wound on the molding surface 120 of the core shaft 100, a transparent sheath tube 1600 can be formed. Personnel can observe the actual foaming, curing and shaping process of the polyurethane foam material in the foaming molding space 1700 through the transparent sheath tube 1600, and thus adjust the foaming parameters according to actual conditions.

Claims

1. A thermal insulation pipe forming machine, characterized in that: include: a core shaft for forming an inner and outer double-layer tube structure of the inner tube and the sheath tube, the core shaft being provided with a central hole along its axial direction for the inner tube to pass through, the outer circumference of the core shaft being provided with a forming circumference for spirally winding a strip of material thereon and continuously forming a sheath tube portion, the core shaft having a solid portion located between the forming circumference and the central hole and for separating the sheath tube portion and the inner tube to form a foaming molding space; The entity part has a rear end face, and is provided with at least one pouring pipe. One end of the pouring pipe is configured as a pouring port for injecting foaming material into the foaming molding space between the continuously conveyed inner tube and the sheath tube, and the pouring port extends a preset distance from the rear end face.

2. The thermal insulation pipe forming machine according to claim 1, characterized in that: The sheath tube portion on the molding surface is continuously molded and separated from the molding surface and continuously transported along a preset direction at the same rate together with the inner tube. The foaming material passes through the core shaft and is injected into the foaming molding space between the continuously transported sheath tube and the inner tube for continuous foaming.

3. The thermal insulation pipe forming machine according to claim 1, characterized in that: It also includes a winding molding mechanism, which includes a hollow turntable for spirally winding the strip material on the molding surface by rotation, the axis of the hollow turntable is coaxially arranged with the axis of the core shaft, and the hollow turntable can rotate around the axis of the core shaft.

4. The thermal insulation pipe forming machine according to claim 3, characterized in that: The end surface of the hollow turntable is equipped with at least one set of guide wheels for guiding the strip material to be wound onto the forming circumferential surface.

5. The thermal insulation pipe forming machine according to claim 3, characterized in that: The end surface of the hollow turntable is provided with a splicing element for fixing adjacent strips wound on the forming circumferential surface together to form a sheath tube portion, and the splicing element is close to the forming circumferential surface.

6. The thermal insulation pipe forming machine according to claim 5, characterized in that: The splicing element is configured as a laser welding device, an electric welding device, an ultrasonic welding device, or a gas welding device that welds adjacent strips on the forming circumferential surface together using a welding method.

7. The thermal insulation pipe forming machine according to claim 6, characterized in that: At least one set of pressing wheels for flattening the weld seam of the sheath pipe is installed on the end surface of the hollow turntable, and the pressing wheels are close to the forming circumferential surface.

8. The thermal insulation pipe forming machine according to claim 7, characterized in that: The pressing wheel is configured as a metal wheel structure for cooling the jacket pipe portion when flattening the weld seam.

9. The thermal insulation pipe forming machine according to claim 3, 4 or 5, characterized in that: The end surface of the hollow turntable is provided with a preheating element for preheating the strip before the strip is wound around the forming surface.

10. The thermal insulation pipe forming machine according to claim 3 or 4, characterized in that: The forming circumferential surface is provided with a baffle which surrounds the forming circumferential surface and is used to limit the strip material wound on the forming circumferential surface from moving in a direction opposite to the conveying direction of the inner tube.

11. The thermal insulation pipe forming machine according to claim 4, characterized in that: The winding forming mechanism further includes a main shaft, the hollow turntable is fixedly connected to the main shaft and the two are coaxially arranged, and when the main shaft rotates, the hollow turntable is driven to rotate.

12. The thermal insulation pipe forming machine according to claim 11, characterized in that: The main shaft is configured as a hollow structure, and an inner hole for the inner tube and the sheath tube to pass through is provided at the center of the main shaft.

13. The thermal insulation pipe forming machine according to claim 11, characterized in that: The winding and forming mechanism further comprises a tape storage reel capable of storing at least one reel of tape and releasing the tape by rotation, and the tape storage reel is rotatably sleeved on the main shaft.

14. The thermal insulation pipe forming machine according to claim 13, characterized in that: The winding and forming mechanism further comprises a storage reel driving element, which is connected to the storage reel and can drive the storage reel to rotate.

15. The thermal insulation pipe forming machine according to claim 14, characterized in that: The hollow turntable is equipped with a conveying element for assisting the conveying of the tape on the tape storage disk to the guide wheel.

16. The thermal insulation pipe forming machine according to claim 11, characterized in that: The winding forming mechanism further includes a main shaft driving element, which is connected to the main shaft and can drive the main shaft to rotate.

17. The thermal insulation pipe forming machine according to claim 14, characterized in that: The main shaft is provided with a conductive ring for power supply.

18. The thermal insulation pipe forming machine according to claim 2, characterized in that: It also includes a stent conveying mechanism for conveying the stent to the foaming molding space so that the inner tube and the sheath tube remain concentric. The stent conveying mechanism, the core shaft and the winding molding mechanism are arranged in sequence. The stent conveying mechanism includes a first mounting seat and a pushing assembly for intermittently conveying the stent to the foaming molding space. The first mounting seat is provided with a through hole for the inner tube to pass through, and the through hole is coaxial with the center hole. The pushing assembly is installed on the first mounting seat.

19. The thermal insulation pipe forming machine according to claim 18, characterized in that: The core shaft is provided with an avoidance hole along its axial direction for the bracket to pass through the core shaft.

20. The thermal insulation pipe forming machine according to claim 19, characterized in that: The pushing assembly includes a first pushing element for pushing the bracket to align with the avoidance hole and a second pushing element for pushing the bracket along the avoidance hole through the core shaft and into the foaming molding space.

21. The thermal insulation pipe forming machine according to claim 20, characterized in that: It also includes a second mounting seat, and the core shaft is detachably connected to the second mounting seat. The stent delivery mechanism also includes a displacement drive element, and the first mounting seat is connected to the displacement drive element and the displacement drive element can drive the first mounting seat to move closer to or away from the second mounting seat.

22. A production line for producing thermal insulation pipes, characterized in that: It includes the thermal insulation pipe forming machine as described in any one of claims 1 to 21, and also includes a traction machine for pulling the inner pipe and the sheath pipe from front to back and a foaming device for providing foaming material, the bracket conveying mechanism, the core shaft, the winding molding mechanism and the traction machine are arranged in sequence from front to back, and the foaming device is connected to the casting pipe on the solid part of the core shaft.

23. A production line according to claim 22, characterized in that: It also includes a preheating device for preheating the formed sheath pipe, a covering mold for covering the outer pipe outside the sheath pipe, and a cooling device for cooling and shaping the insulating pipe covered with the outer pipe. The preheating device, the covering mold and the cooling device are arranged in sequence from front to back between the winding forming mechanism and the traction machine.

24. A production line according to claim 23, characterized in that: It also includes a corona machine for roughening the outer surface of the inner tube before processing, and the corona machine is arranged in front of the stent conveying mechanism.

25. A production line according to claim 24, characterized in that: It also includes a retarder for controlling the tension of the inner tube, and the retarder is arranged in front of the corona machine.

26. A production line according to claim 25, characterized in that: It also includes an unwinder for releasing the inner tube and a rewinder for rewinding the heat-insulating pipe. The unwinder is located in front of the blocking machine, and the rewinder is located behind the cooling device.

27. A production process, characterized in that: The method is used for continuously producing thermal insulation pipes, comprising the following steps: S1: The inner tube passes through the center hole of the core shaft, and the main shaft drives the hollow turntable to rotate. The tape storage disk rotates on the main shaft and releases the tape. The tape is then led to the guide wheel of the hollow turntable. The rotating hollow turntable spirally winds the tape around the forming surface of the core shaft to form a jacket tube portion. The inner tube in the center hole and the formed jacket tube portion form an inner and outer double-layer tube structure, and a foaming molding space for filling with foaming material is formed between the inner tube and the jacket tube. S2: The hollow turntable drives the splicing element to rotate around the jacket tube portion on the forming surface, thereby welding the adjacent strips wrapped around the forming surface together. The hollow turntable drives the pressing wheel to roll on the outer circumference of the jacket tube to flatten and cool the weld; S3: The stent conveying mechanism intermittently conveys the stents into the foam molding space. The first pushing element pushes the stents to align with the avoidance hole, and the second pushing element pushes the stents through the core shaft and into the foam molding space. The stents move synchronously from front to back along with the inner tube and the sheath tube. After synchronous movement for a certain distance, the stent conveying mechanism conveys the next group of stents. S4: While the front portion of the jacket tube is continuously being formed, the rear portion of the jacket tube is separated from the molding surface and conveyed backward at the same rate as the inner tube. Since the pouring port extending from the rear end face of the mandrel corresponds to the foaming molding space, the foaming device can inject the prepared foaming material into the pouring pipe and inject it from the pouring port into the foaming molding space between the continuously conveyed inner tube and the jacket tube. As the inner tube and the jacket tube are continuously conveyed backward, the foaming material is continuously solidified and shaped in the foaming molding space to form a thermal insulation layer. S5: The insulated pipe passing through the insulated pipe forming machine is preheated by the preheating device and then enters the covering mold. When passing through the die mouth of the covering mold, the insulated pipe is covered with a layer of outer tube outside the jacket tube, and then enters the cooling device to be quickly shaped and pulled out at a uniform speed.

28. A production process according to claim 27, characterized in that: In step S3, the inner tube needs to enter a corona machine for surface pre-treatment before entering the stent delivery mechanism.

29. A production process according to claim 27, characterized in that: The belt material is a plastic belt, and the foam material is a polyurethane foam material.

30. A production process according to claim 29, characterized in that: The strip is made of transparent plastic, so when the strip is spirally wound around the molding surface of the core shaft, it can form a transparent sheath tube. Personnel can observe the actual foaming, curing and shaping process of the polyurethane foam material in the foaming molding space through the transparent sheath tube, and thus adjust the foaming parameters according to actual conditions.

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