Preparation method of high-temperature-resistant prefabricated thermal insulation pipeline

Abstract

The invention relates to a preparation method of a high-temperature-resistant prefabricated heat-preservation pipeline, which belongs to the heat-preservation pipeline preparation technology, and comprises the steps of inner steel pipe preparation, composite layer preparation, part preparation and part assembly: taking a seamless steel pipe as an inner steel pipe foundation, welding a central fixing ring at the central position of the inner steel pipe, and then cleaning the surface of the inner steel pipe; the composite layer is arranged on the outer wall of the inner steel pipe to remove oil stains, rust and dust impurities, then the inner steel pipe is subjected to anti-corrosion treatment, specifically, the inner steel pipe can be coated with anti-corrosion paint or subjected to hot galvanizing treatment, and the composite layer is composed of a heat preservation steel pipe arranged on the outer wall of the inner steel pipe, an anti-tearing layer wrapping the heat preservation steel pipe and an outer protection layer wrapping the anti-tearing layer. According to the pipeline leakage alarm device, the heat preservation effect is good, the intelligent degree is high, an alarm can be given in time when leakage occurs, rapid assembly between pipelines is facilitated, and high application value is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of heat-insulated pipe preparation, and in particular to a method for preparing a high-temperature resistant prefabricated heat-insulated pipe. Background Art

[0002] Insulated pipe is a kind of pipe material used for the transportation of liquid, gas and other media. It has excellent thermal insulation performance and is widely used in many fields such as petroleum, chemical industry, aerospace and power system. Insulated pipe is mainly composed of working steel pipe, insulation layer, protective shell and leakage alarm line. Among them, the insulation layer is mostly made of hard polyurethane foam plastic or aerogel felt and has good thermal insulation performance. The protective shell is made of high-density polyethylene or fiberglass to enhance the mechanical strength and corrosion resistance of the pipe. It is difficult to find or determine the leakage location in time after the leakage accident of the existing insulated pipe, which may lead to a major accident.

[0003] In view of the above problems, a Chinese invention patent with announcement number CN106641592A discloses an intelligent insulated pipe with an alarm device, including an insulated pipe composed of a steel pipe, an insulation layer, and an outer protective pipe, and also including a test line, an alarm line, a lead-out joint, a lead-out wire, and a detection device; the test line and the alarm line are respectively parallel to the axis of the steel pipe and pre-buried in the insulation layer at a set distance from the outer side of the steel pipe; the lead-out joint is fixed at the outer protective pipe of the preset monitoring point of the insulation pipe, and two mutually insulated lead-out heads are arranged on the lead-out joint, which are respectively connected to the steel pipe and the test line or the alarm line; the lead-out wire is connected between the lead-out joint and the detection device, and a plug matching the lead-out joint is arranged at one end of the lead-out wire, and a connector matching the connection detection device is arranged at the other end. The above invention provides an intelligent insulated pipe with an alarm device that has a reasonable structure and is easy to operate, which can quickly detect leakage problems of the insulation pipe, facilitate timely maintenance of the insulation pipe, and avoid erosion and carbonization of the insulation layer caused by leakage of high-temperature media in the pipeline.

[0004] However, the realization of its leakage detection function requires reliance on more electrical components, and at the same time relies on the capacitance change caused by the medium entering the insulation layer for detection. This results in some gaseous media, or media with less impact on the insulation layer, which may cause small capacitance changes, thereby affecting the detection effect. In view of this, the present application is proposed. Summary of the invention

[0005] In order to overcome the technical defects of the prior art, the present invention provides a method for preparing a high-temperature resistant prefabricated insulated pipe, which has good insulation effect, high degree of intelligence, and is convenient for rapid assembly between pipes.

[0006] The technical solution adopted by the present invention is: a method for preparing a high temperature resistant prefabricated thermal insulation pipe, comprising the following steps: S1. Preparation of inner steel pipe: using seamless steel pipe as the base of inner steel pipe, welding a central fixing ring at the center of the inner steel pipe, and then cleaning the surface of the inner steel pipe to remove oil, rust and dust impurities for subsequent processing, and reducing the friction of the inner steel pipe surface, so that the resistance of the pipe wall detection part installed on the inner steel pipe is small when moving, and then performing anti-corrosion treatment on the inner steel pipe, specifically, coating with anti-corrosion paint or performing hot-dip galvanizing treatment; S2. Preparation of a composite layer, wherein the composite layer is composed of an insulating steel pipe installed on the outer wall of the inner steel pipe, a tear-resistant layer wrapped on the insulating steel pipe, and an outer protective layer wrapped outside the tear-resistant layer. A seamless steel pipe is used as an insulating steel pipe sleeved on the outside of the inner steel pipe. A composite fabric woven from cotton fiber and rubber thread is used as an insulating raw material to prepare the tear-resistant layer. The composite fabric is tightly wrapped on the surface of the insulating steel pipe and fixed with a wire mesh so that the outer surface of the insulating steel pipe is fully covered with the composite fabric to form an insulating tear-resistant layer. Finally, an outer protective layer is wrapped outside the tear-resistant layer. There is a cavity between the insulating steel pipe and the inner steel pipe, which can be filled with inert gas in actual use. The tear-resistant layer with insulation capacity forms a double insulation structure, which effectively improves the insulation performance of the insulating pipe. S3. Preparation of parts. The parts include an elastic telescopic plug-in rod, a gas density meter, a signal transmitter, a pipe wall detector, and a traction assembly for controlling the movement of the pipe wall detector for installation on the inner steel pipe. It also includes a clamping end and a butt end for installation at both ends of the inner steel pipe for connection. The clamping end and the butt end can be used to cooperate with each other to achieve a drive-free and screw-free installation. Under the premise of ensuring the sealing effect, no other parts are required, which greatly improves the installation efficiency. S4, assembling parts, drilling a number of holes in a uniform circular array on the central fixing ring, installing elastic telescopic plug rods in each hole, symmetrically drilling four installation grooves on the two side walls of the central fixing ring, and installing the gas density meter and the signal transmitter in the grooves; The pipe wall detector and the traction component are assembled and connected, and the traction components are connected to both sides of a single pipe wall detector. The insulation steel pipe in the composite layer is processed with a plug groove and a thread groove. The plug groove is used for inserting the elastic telescopic plug rod. The composite layer is assembled and connected with the inner steel pipe by inserting the elastic telescopic plug rod into the plug groove. Then, the traction component on one side is installed on the side wall of the central fixing ring, and then the pipe wall detector is sleeved on the inner steel pipe, and then gradually screwed into the interior using the thread groove. The traction component on the other side is installed on the outer convex edge. Finally, the outer convex edges are welded at both ends of the inner steel pipe, and the inner steel pipe and the central fixing ring are connected and sealed through the outer convex edges. Then, an inflation valve is installed on the outer convex edge, and an inert gas is filled into the cavity between the inner steel pipe and the insulation steel pipe. The filling of the inert gas can fill the cavity between the inner steel pipe and the composite layer, reduce the thermal conductivity effect, improve the thermal insulation performance, and is beneficial to the leakage detection of the gas density meter. S5. Overall assembly: Install the clamping ends and the butt ends at both ends of the assembled inner steel pipe and the composite layer, and install sealing gaskets at the joints to complete the preparation of the insulation pipe. The pipes can be connected by the cooperation of the clamping ends and the butt ends.

[0007] Preferably, the clamping end and the docking end are both composed of an integrally formed sealing cover and a docking ring, the sealing gasket is located inside the sealing cover, and the docking ring is arranged on the outer side of the sealing cover. In actual use, the sealing gasket is first placed in the sealing cover, and then the sealing cover is put on the assembled inner steel pipe and the end of the composite layer. The gap between the inner steel pipe and the composite layer is effectively sealed by the sealing gasket to prevent air leakage.

[0008] Preferably, a plurality of combined grooves are provided in a circular array on the docking ring of the docking end, and the combined grooves include a circular through groove and a strip through groove. The circular through groove has a larger diameter and can pass through a toggle rod with a larger diameter. The toggle rod can be stuck when it slides into the strip through groove.

[0009] Preferably, a plurality of elastic contraction rods are arranged in a circular array on the docking ring of the clamping end, and a toggle rod is connected to the telescopic end of the elastic contraction rod. The elastic contraction rod is composed of an outer rod, an inner rod and a highly elastic spring. The inner rod is slidably installed in the outer rod through the spring, so that although the elastic contraction rod has a certain telescopic ability, it has a strong retraction ability when pulled out, that is, it can exert a strong pulling force on the clamping end clamped by the toggle rod, thereby ensuring that the clamping end and the docking end can have a high connection strength after connection.

[0010] Preferably, the diameter of the toggle rod is smaller than the diameter of the circular through groove and larger than the width of the strip through groove, and the diameter of the telescopic end of the elastic contraction rod is smaller than the width of the strip through groove, so that the toggle rod can pass through the circular through groove and then be stuck in the strip through groove. In actual use, first take a sealing ring and place it between the clamping end and the butt end of the two insulation pipes, and then merge the clamping end and the butt end to allow the toggle rod to pass through the circular through groove, and then control the toggle rod to move into the strip through groove, so that the toggle rod is stuck in the strip through groove and will not come out.

[0011] Preferably, a flange is provided on one side of the combined groove, and the thickness of the flange gradually increases from the circular through groove to the strip through groove. A buckling ring is fixedly provided on one side of the toggle rod, and can be snapped into the flange after the toggle rod moves to the end of the strip through groove. After the toggle rod slides from the circular through groove to the strip through groove, as the sliding distance increases, the toggle rod will be continuously lifted up by the flange to pull out the elastic telescopic rod, and the spring is used to apply a pulling force, so that the snap-on end and the butt end can have a higher connection strength after connection, so as to ensure the sealing effect of the sealing ring.

[0012] Preferably, the pipe wall detector includes a sleeve ring and an ultrasonic detector fixedly arranged on the inner wall of the sleeve ring, the sleeve ring is movably sleeved on the inner steel pipe, and an external thread connected to the thread groove of the insulating steel pipe is opened on the outer wall of the sleeve ring, so that the sleeve ring can slide on the outside of the inner steel pipe. Since it is threadedly connected to the insulating steel pipe, it will also rotate during the process of being controlled by the traction component to move horizontally, thereby driving the ultrasonic detector to rotate while moving horizontally on the outside of the inner steel pipe, and the pipe wall thickness of the inner steel pipe is detected by the ultrasonic detector. This function is used in conjunction with the leakage detection function. Specifically, when a pipeline leak occurs, the signal transmitter sounds an alarm and the traction component and the ultrasonic detector are also started at the same time. During the process of the traction component driving the sleeve ring to move, the ultrasonic detector detects the pipe wall thickness of each part of the inner steel pipe and stops moving after the damaged part is found. At this time, the leakage part can also be temporarily blocked by the sleeve ring to minimize the leakage of materials in the insulating pipe.

[0013] Preferably, the traction assembly includes a reel and a traction rope, the reel consists of a shell, a motor and a winding wheel connected to the output shaft of the motor, the motor and the winding wheel are both installed in the shell, one end of the traction rope is fixed on the winding wheel, and the other end is fixedly connected to the side wall of the sleeve ring, the sleeve ring is pulled by the reel, and when the sleeve ring moves, it can rotate due to the setting of the thread groove and the internal thread, so as to carry the ultrasonic detector to perform pipe wall detection in multiple orientations.

[0014] The beneficial effects of the present invention are: 1. There is a cavity between the insulated steel pipe and the inner steel pipe produced by the present invention, which can be filled with inert gas during actual use, and a double insulation structure is formed with the anti-tear layer with insulation capacity, which effectively improves the insulation performance of the insulation pipe. The anti-tear layer is made of cotton fiber, which has a thermal insulation effect. The highly elastic rubber wire can make a loud noise when torn and will rebound to a certain extent, so that wild animals will be frightened when destroying the insulation pipe, thereby avoiding further damage to the insulation pipe.

[0015] 2. The thermal insulation pipe prepared by the present invention includes a clamping end and a butt end. The connection between the thermal insulation pipes is achieved through the cooperation of the clamping end and the butt end, which can realize drive-free and screw-free installation. The splicing can be completed manually. Under the premise of ensuring the sealing effect, no other components are required, which greatly improves the installation efficiency.

[0016] 3. The insulated pipe prepared by the present invention has an intelligent leak detection and emergency handling structure. When a pipeline leak occurs, the signal transmitter sounds an alarm, and the traction component and the ultrasonic detector are also started at the same time. When the traction component drives the sleeve ring to move, the ultrasonic detector detects the wall thickness of each part of the inner steel pipe and stops moving after finding the damaged part. At this time, the leaking part can be temporarily blocked by the sleeve ring to reduce the leakage of materials in the insulated pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the cross-sectional structure of the thermal insulation pipe prepared by the present invention.

[0018] Figure 2 It is a schematic diagram of the overall structure of the insulation pipe.

[0019] Figure 3 This is a structural diagram of the insulation pipe from the left side perspective.

[0020] Figure 4 This is a schematic diagram of the butt end structure of the insulation pipe.

[0021] Figure 5 It is a schematic diagram of the clamping end structure of the insulation pipe.

[0022] Figure 6 for Figure 5 A partial enlarged view of point A in the middle.

[0023] Figure 7 It is a connection diagram of the docking end and the card connection end.

[0024] Figure 8 Schematic diagram of the external structure of the inner steel pipe of the insulation pipe.

[0025] Fig. 9It is a schematic diagram of the structure of the pipe wall detection component and the traction component.

[0026] Fig.10 Schematic diagram of the interior of the insulated steel pipe.

[0027] Explanation of the accompanying drawings: In the figure: 1. inner steel pipe; 101. outer convex edge; 102. center fixing ring; 103. elastic telescopic plug-in rod; 104. gas density meter; 105. signal transmitter; 2. insulation steel pipe; 201. plug-in groove; 202. threaded groove; 3. anti-tear layer; 4. outer protective layer; 5. snap-on end; 501. elastic shrinkage rod; 502. toggle rod; 503. buckle ring; 6. docking end; 601. sealing cover; 602. docking ring; 603. sealing gasket; 604. circular through groove; 605. strip through groove; 606. flange; 7. pipe wall detection part; 701. sleeve ring; 702. ultrasonic detector; 703. external thread; 8. traction assembly; 801. reel; 802. traction rope. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings: like Figure 1-Figure 10 As shown, this embodiment provides a method for preparing a high temperature resistant prefabricated insulated pipe, comprising the following steps: S1. Preparation of the inner steel pipe 1. A seamless steel pipe is used as the base of the inner steel pipe 1. A central fixing ring 102 is welded at the center of the inner steel pipe 1. Then, the surface of the inner steel pipe 1 is cleaned to remove oil, rust and dust impurities for subsequent processing, and the friction force on the surface of the inner steel pipe 1 is reduced so that the resistance of the pipe wall detection member 7 installed on the inner steel pipe 1 during movement is small. Then, the inner steel pipe 1 is subjected to an anti-corrosion treatment, specifically, an anti-corrosion coating can be applied or hot-dip galvanized to effectively improve the corrosion resistance of the inner steel pipe 1, thereby increasing the service life of the pipeline; S2. Preparation of composite layer. The composite layer is composed of a heat-insulating steel pipe 2 installed on the outer wall of the inner steel pipe 1, a tear-resistant layer 3 wrapped on the heat-insulating steel pipe 2, and an outer protective layer 4 wrapped on the outside of the tear-resistant layer 3. A seamless steel pipe is used as the heat-insulating steel pipe 2 sleeved on the outside of the inner steel pipe 1. A composite fabric woven from cotton fiber and rubber thread is used as the heat-insulating raw material to prepare the tear-resistant layer 3. The composite fabric is tightly wrapped on the surface of the heat-insulating steel pipe 2 and fixed with a wire mesh so that the outer surface of the heat-insulating steel pipe 2 is fully covered with the composite fabric to form a heat-insulating tear-resistant layer 3. Finally, A layer of outer protective layer 4 is wrapped around the outside of the tear-proof layer 3. There is a cavity between the insulated steel pipe 2 and the inner steel pipe 1. In actual use, inert gas can be filled in, and a double insulation structure is formed with the tear-proof layer 3 with insulation ability, which effectively improves the insulation performance of the insulation pipe. The tear-proof layer 3 is made of cotton fiber, which has a heat-insulating effect. The highly elastic rubber wire can make a loud noise when it is torn, and will rebound to a certain extent, so that wild animals are frightened when they destroy the insulation pipe, so as to avoid further damage to the insulation pipe. S3. Preparation of parts. The parts include an elastic telescopic plug rod 103, a gas density meter 104, a signal transmitter 105, a pipe wall detector 7, and a traction assembly 8 for controlling the movement of the pipe wall detector 7, and also include a clamping end 5 and a butt end 6 for being installed at both ends of the inner steel pipe 1 for connection. The clamping end 5 and the butt end 6 can be used to cooperate with each other between the insulation pipes to achieve drive-free and screw-free installation. Under the premise of ensuring the sealing effect, no other parts are needed, which greatly improves the installation efficiency; S4, assembling parts, drilling a number of holes in a uniform circular array on the central fixing ring 102, installing elastic telescopic plug rods 103 in each hole, symmetrically drilling four installation grooves on the two side walls of the central fixing ring 102, and installing the gas density meter 104 and the signal transmitter 105 in the grooves; The pipe wall detector 7 and the traction component 8 are assembled and connected. Both sides of a single pipe wall detector 7 are connected to the traction component 8. The plug groove 201 and the thread groove 202 are processed on the thermal insulation steel pipe 2 in the composite layer. The plug groove 201 is used for inserting the elastic telescopic plug rod 103. The composite layer is assembled and connected with the inner steel pipe 1 by inserting the elastic telescopic plug rod 103 into the plug groove 201. Then, the traction component 8 on one side is installed on the side wall of the central fixing ring 102, and then the pipe wall detector 7 is sleeved on the inner steel pipe 1, and then gradually screwed into the interior using the thread groove 202, and the traction component 8 on the other side is installed on the outer convex edge 101, and finally, the outer convex edges 101 are welded at both ends of the inner steel pipe 1, and the inner steel pipe 1 and the central fixing ring 102 are connected and sealed through the outer convex edge 101, and then an inflation valve is installed on the outer convex edge 101 to inflate the inner steel pipe 1. The cavity between the pipe 1 and the insulated steel pipe 2 is filled with inert gas. The role of filling inert gas is reflected in two aspects. On the one hand, it can fill the cavity between the inner steel pipe 1 and the composite layer, reduce the thermal conductivity, and improve the thermal insulation performance. On the other hand, it can make the gas environment density in the cavity different from that of conventional air, which is conducive to the leakage detection of the gas density meter 104. The specific detection principle is: after filling with inert gas, the detection value of the gas density meter 104 is constant. When the inner steel pipe 1 is partially cracked or damaged, the inert gas is exchanged with the air in the inner steel pipe 1. At this time, the value detected by the gas density meter 104 will change. At this time, an alarm signal can be sent through the signal transmitter 105. Compared with the existing insulated pipelines with intelligent alarms, the present application uses fewer electrical components, lower costs, and higher application value. S5, overall assembly, the clamping end 5 and the butt end 6 are installed on both ends of the assembled inner steel pipe 1 and the composite layer, and the sealing gasket 603 is installed at the connection to complete the preparation of the insulation pipe. The pipes can be connected by the cooperation of the clamping end 5 and the butt end 6.

[0029] The clamping end 5 and the docking end 6 are both composed of an integrally formed sealing cover 601 and a docking ring 602. The sealing gasket 603 is located in the sealing cover 601, and the docking ring 602 is arranged on the outer side of the sealing cover 601. In actual use, the sealing gasket 603 is first placed in the sealing cover 601, and then the sealing cover 601 is put on the assembled inner steel pipe 1 and the end of the composite layer. The gap between the inner steel pipe 1 and the composite layer is effectively sealed by the sealing gasket 603 to prevent air leakage. A plurality of combined grooves are provided in an annular array on the docking ring 602 of the docking end 6. The combined grooves include a circular through groove 604 and a strip through groove 605. The circular through groove 604 has a larger diameter and can pass through a toggle rod 502 with a larger diameter. The toggle rod 502 can be stuck when it slides into the strip through groove 605.

[0030] A plurality of elastic contraction rods 501 are arranged in a circular array on the docking ring 602 of the clamping end 5, and a toggle rod 502 is connected to the telescopic end of the elastic contraction rod 501. The elastic contraction rod 501 is composed of an outer rod, an inner rod and a highly elastic spring. The inner rod is slidably installed in the outer rod through the spring, so that although the elastic contraction rod 501 has a certain telescopic ability, it has a strong retraction ability when pulled out, that is, it can apply a strong pulling force to the clamping end 5 clamped by the toggle rod 502, thereby ensuring that the clamping end 5 and the docking end 6 can have a high connection strength after connection. In actual use, a sealing ring is installed between the two insulation pipes, and the sealing effect of the sealing ring is ensured by the extrusion of the clamping end 5 and the docking end 6.

[0031] The diameter of the toggle rod 502 is smaller than the diameter of the circular through groove 604 and larger than the width of the strip through groove 605. The diameter of the telescopic end of the elastic contraction rod 501 is smaller than the width of the strip through groove 605, so that the toggle rod 502 can pass through the circular through groove 604 and then be stuck in the strip through groove 605. In actual use, first take a sealing ring and place it between the clamping end 5 and the butt end 6 of the two insulation pipes, then combine the clamping end 5 and the butt end 6, so that the toggle rod 502 passes through the circular through groove 604, and then control the toggle rod 502 to move into the strip through groove 605, so that the toggle rod 502 is stuck in the strip through groove 605 and will not fall out. A flange 606 is provided on one side of the combined groove, and the thickness of the flange 606 gradually increases from the circular through groove 604 to the strip through groove 605. A buckle ring 503 is fixedly provided on one side of the toggle rod 502, and the toggle rod 502 can be snapped into the flange 606 after it moves to the end of the strip groove 605. After the toggle rod 502 slides from the circular groove 604 to the strip groove 605, as the sliding distance increases, the toggle rod 502 will be continuously lifted up by the flange 606 to pull out the elastic telescopic rod, and the spring is used to apply a pulling force, so that the snap-on end 5 and the docking end 6 can have a higher connection strength after connection to ensure the sealing effect of the sealing ring. Compared with the existing pipe connection structure, the present invention adopts a snap-on structure for assembly, without the aid of other installation tools, and can be spliced ​​manually. At the same time, it can still maintain a high-strength sealing effect, which greatly improves the installation efficiency of the insulation pipe.

[0032] The pipe wall detector 7 includes a sleeve ring 701 and an ultrasonic detector 702 fixedly arranged on the inner wall of the sleeve ring 701. The sleeve ring 701 is movably sleeved on the inner steel pipe 1. The outer wall of the sleeve ring 701 is provided with an external thread 703 connected to the thread groove 202 of the insulation steel pipe 2, so that the sleeve ring 701 can slide outside the inner steel pipe 1. Since it is threadedly connected to the insulation steel pipe 2, it will also rotate during the process of being controlled by the traction component 8 to move horizontally, thereby driving the ultrasonic detector 702 to rotate while moving horizontally outside the inner steel pipe 1. The pipe wall thickness of the inner steel pipe 1 is detected by the ultrasonic detector 702. This function is used in conjunction with the leakage detection function. Specifically, when a pipeline leak occurs, the signal transmitter 105 When the alarm is sounded, the traction component 8 and the ultrasonic detector 702 are also started at the same time. When the traction component 8 drives the sleeve ring 701 to move, the ultrasonic detector 702 detects the wall thickness of each part of the inner steel pipe 1, and stops moving after finding the damaged part. At this time, the leakage part can be temporarily blocked by the sleeve ring 701 to minimize the leakage of materials in the insulation pipe. In addition, preventive detection can be carried out. The detection cycle of the ultrasonic detector 702 is set to one month or three months according to needs, and the pipeline is regularly detected. When the wall thickness decreases or increases, it indicates that there may be abnormalities inside the pipeline. At this time, staff can be arranged to inspect and repair it, thereby further improving the intelligence level of the insulation pipe.

[0033] The traction assembly 8 includes a reel 801 and a traction rope 802. The reel 801 consists of a shell, a motor, and a winding wheel connected to the output shaft of the motor. The motor and the winding wheel are both installed in the shell. One end of the traction rope 802 is fixed on the winding wheel, and the other end is fixedly connected to the side wall of the sleeve ring 701. The sleeve ring 701 is pulled by the reel 801. When the sleeve ring 701 moves, it can rotate due to the setting of the thread groove 202 and the internal thread, so as to carry the ultrasonic detector 702 to perform pipe wall detection in multiple directions.

[0034] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for illustrating the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which shall fall within the scope of the present invention to be protected. The scope of protection of the present invention shall be defined by the attached claims and their equivalents.

Claims

1. A method for preparing a high temperature resistant prefabricated thermal insulation pipe, characterized in that: The following steps are involved: S1. Preparation of the inner steel pipe (1), using a seamless steel pipe as the base of the inner steel pipe (1), welding a central fixing ring (102) at the center of the inner steel pipe (1), then cleaning the surface of the inner steel pipe (1) to remove oil stains, rust and dust impurities, and then performing an anti-corrosion treatment on the inner steel pipe (1), specifically, coating the inner steel pipe with an anti-corrosion coating or performing a hot-dip galvanizing treatment; S2, preparation of a composite layer, the composite layer consisting of a heat-insulating steel pipe (2) for installation on the outer wall of the inner steel pipe (1), a tear-resistant layer (3) wrapped on the heat-insulating steel pipe (2), and an outer protective layer (4) wrapped on the outside of the tear-resistant layer (3), a seamless steel pipe is used as the heat-insulating steel pipe (2) sleeved on the outside of the inner steel pipe (1), a composite fabric woven from cotton fiber and rubber thread is used as the heat-insulating raw material to prepare the tear-resistant layer (3), the composite fabric is tightly wrapped on the surface of the heat-insulating steel pipe (2), and fixed with a wire mesh, so that the outer surface of the heat-insulating steel pipe (2) is fully covered with the composite fabric to form a heat-insulating tear-resistant layer (3), and finally a layer of outer protective layer (4) is wrapped on the outside of the tear-resistant layer (3); S3, preparing components, the components including an elastic telescopic plug-in rod (103) for installation on the inner steel pipe (1), a gas density meter (104), a signal transmitter (105), a pipe wall detector (7), and a traction assembly (8) for controlling the movement of the pipe wall detector (7), and also including a clamping end (5) and a butt end (6) for installation at both ends of the inner steel pipe (1) for connection; S4, assembling parts, drilling a number of holes in a uniform circular array on the central fixing ring (102), installing elastic telescopic plug rods (103) in each hole, symmetrically drilling four installation grooves on the two side walls of the central fixing ring (102), and installing a gas density meter (104) and a signal transmitter (105) in the grooves; The pipe wall detection member (7) and the traction assembly (8) are assembled and connected, and both sides of a single pipe wall detection member (7) are connected to the traction assembly (8). The insulation steel pipe (2) in the composite layer is processed with a plug groove (201) and a thread groove (202). The plug groove (201) is used for inserting the elastic telescopic plug rod (103). The composite layer and the inner steel pipe (1) are assembled and connected by inserting the elastic telescopic plug rod (103) into the plug groove (201). Then, the traction assembly (8) on one side is installed to the central fixing ring (102). ), and then sleeve the wall detector (7) on the inner steel pipe (1), and then gradually screw it into the interior using the thread groove (202), and the traction component (8) on the other side is installed on the outer flange (101), and finally the outer flange (101) is welded at both ends of the inner steel pipe (1), and the inner steel pipe (1) and the central fixing ring (102) are connected and sealed through the outer flange (101), and then a charging valve is installed on the outer flange (101), and an inert gas is charged into the cavity between the inner steel pipe (1) and the insulation steel pipe (2); S5, overall assembly, installing the clamping ends (5) and the butt ends (6) at both ends of the assembled inner steel pipe (1) and the composite layer, and installing the sealing gasket (603) at the connection to complete the preparation of the insulation pipe. The pipes can be connected by the cooperation of the clamping ends (5) and the butt ends (6).

2. The method for preparing a high temperature resistant prefabricated thermal insulation pipe according to claim 1, characterized in that: The clamping end (5) and the docking end (6) are both composed of an integrally formed sealing cover (601) and a docking ring (602); the sealing gasket (603) is located inside the sealing cover (601), and the docking ring (602) is arranged on the outer side of the sealing cover (601).

3. The method for preparing a high temperature resistant prefabricated thermal insulation pipe according to claim 2, characterized in that: A plurality of combined grooves are provided in a ring array on the docking ring (602) of the docking end (6), and the combined grooves include a circular through groove (604) and a strip-shaped through groove (605).

4. The method for preparing a high temperature resistant prefabricated thermal insulation pipe according to claim 3, characterized in that: A plurality of elastic contraction rods (501) are arranged in a ring array on the docking ring (602) of the clamping end (5), and a toggle rod (502) is connected to the telescopic end of the elastic contraction rod (501).

5. The method for preparing a high temperature resistant prefabricated thermal insulation pipe according to claim 4, characterized in that: The diameter of the toggle rod (502) is smaller than the diameter of the circular through slot (604) and larger than the width of the strip through slot (605); the diameter of the telescopic end of the elastic contraction rod (501) is smaller than the width of the strip through slot (605), so that the toggle rod (502) can pass through the circular through slot (604) and then snap into the strip through slot (605).

6. The method for preparing a high temperature resistant prefabricated thermal insulation pipe according to claim 5, characterized in that: A flange (606) is provided on one side of the combined groove, and the thickness of the flange (606) gradually increases from the circular through groove (604) to the strip-shaped through groove (605). A buckle ring (503) is fixedly provided on one side of the toggle rod (502), and the toggle rod (502) can be snapped into the flange (606) after moving to the end of the strip-shaped through groove (605).

7. The method for preparing a high temperature resistant prefabricated thermal insulation pipe according to claim 1, characterized in that: The pipe wall detection member (7) comprises a sleeve ring (701) and an ultrasonic detector (702) fixedly arranged on the inner wall of the sleeve ring (701); the sleeve ring (701) is movably sleeved on the inner steel pipe (1); and an external thread (703) connected to the thread groove (202) of the insulating steel pipe (2) is formed on the outer wall of the sleeve ring (701).

8. The method for preparing a high temperature resistant prefabricated thermal insulation pipe according to claim 7, characterized in that: The traction assembly (8) comprises a wire reel (801) and a traction rope (802); the wire reel (801) comprises a housing, a motor, and a winding wheel connected to the output shaft of the motor; the motor and the winding wheel are both installed in the housing; one end of the traction rope (802) is fixed to the winding wheel, and the other end is fixedly connected to the side wall of the sleeve ring (701).

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