Thermal insulation composite pipeline and preparation process and size detection equipment thereof

Abstract

The invention discloses a thermal insulation composite pipeline and a preparation process and size detection equipment thereof, and belongs to the technical field of pipeline preparation, and the preparation process comprises the following steps: forming an inner pipe made of a PE-RT II type material and provided with spiral convex ribs on the outer wall; a layer of heat-conducting silica gel is brushed in the spiral convex ribs of the inner pipe; preparing a heat preservation winding pipe; then the heat preservation winding pipe which is not completely cooled and shaped is wound outside the inner pipe, and then the heat preservation winding pipe is cooled and shaped between the spiral convex ribs of the inner pipe; brushing a layer of 0.5-1mm photocuring buffer material on the outer part of the heat preservation winding pipe; and finally, sleeving a transparent polyethylene pipe, forming a photocuring buffer layer between the transparent polyethylene pipe and the heat-insulating winding pipe by adopting a photocuring process, detecting the thickness and the outer diameter through size detection equipment after forming, and packaging after the detection is qualified. In this way, the heat preservation effect, the compressive strength, the heat temperature resistance and the like are enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline preparation, and in particular to a thermal insulation composite pipeline, a preparation process thereof, and a size detection device thereof. Background Art

[0002] The heating pipeline structure generally includes an inner pipe for heat transfer, an insulation layer outside the inner pipe, and a covering sleeve outside the insulation layer.

[0003] CN105965903B discloses a prefabricated direct-buried insulated PPR composite pipe and a preparation method thereof, comprising a working inner pipe, an insulation layer and an outer sheath pipe, wherein the working inner pipe is a glass fiber reinforced biaxially stretched PPR pipe, the insulation layer is a polyurethane rigid foam plastic, and the outer sheath pipe is a polyethylene pipe.

[0004] However, it has the following problems: the multi-layer rigid coating method is used, and the pipe is prone to deformation after being squeezed, and its pressure bearing performance still needs to be further improved. At the same time, the overall thermal insulation effect still needs to be improved; at the same time, the current pipeline movement detection equipment cannot be suitable for pipelines of different sizes, and at the same time, it cannot always set the center of the circle at the set position.

[0005] Based on this, the present invention designs a thermal insulation composite pipe and its preparation process and size detection equipment to solve the above problems. Summary of the invention

[0006] In view of the above-mentioned shortcomings of the prior art, the present invention provides a thermal insulation composite pipe and a preparation process and a size detection device thereof.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A preparation process of a thermal insulation composite pipe comprises the following steps:

[0009] 1. The inner tube is made of PE-RT II material with spiral ribs on the outer wall;

[0010] 2. Brush a layer of 0.2-0.5mm thermal conductive silicone inside the spiral ribs of the inner tube;

[0011] 3. Prepare the thermal insulation winding pipe, the specific method is: weigh 42-58 parts of polyether polyol, 35-48 parts of isocyanate, 17-22 parts of polyarylate fiber, 30-42 parts of aluminum silicate fiber, 4-10 parts of foaming agent, 11-15 parts of polydopamine modified carbon nanotubes, 0.5-1 parts of catalyst, mix and foam through a mold, cool to 50-55 ° C, and fill the tube with spherical silica aerogel particles;

[0012] Fourth, the heat preservation wrapping tube that has not been completely cooled and formed is then wrapped around the outside of the inner tube, and the longitudinal wrapping angle is controlled to be 40-43°. The heat preservation wrapping tube is then cooled and formed between the spiral ribs of the inner tube;

[0013] 5. Apply a layer of 0.5-1mm light-curing buffer material on the outside of the thermal insulation wrap tube;

[0014] 6. Finally, put on the transparent polyethylene tube, and use the light-curing process to form a light-curing buffer layer between the transparent polyethylene tube and the thermal insulation wrapping tube. After forming, the thickness and outer diameter are tested by size detection equipment, and packaging is carried out after passing the test.

[0015] Furthermore, the particle size of the silica aerogel particles is 5-10 μm.

[0016] Furthermore, the outer diameter of the thermal insulation winding tube is 0.8-1.6 mm, and the thickness is 0.5-1 mm.

[0017] Furthermore, the preparation method of polydopamine-modified carbon nanotubes is as follows: weigh 1 part of carbon nanotube powder and place it at minus 20°C to minus 10°C for freezing treatment for 10-15 hours; then disperse it in 10 parts of a mixed solution of Tris-HCl buffer (pH=7.5) and 75% ethanol, and mix it into a uniform dispersion; then add 0.8-1.2 parts of dopamine hydrochloride dropwise to the dispersion, stir the reaction for 5-10 hours, and obtain polydopamine-modified carbon nanotubes after centrifugation, washing and drying.

[0018] Furthermore, the photocurable buffer material comprises the following raw materials in parts by weight: 40-55 parts of UV elastic resin, 20-35 parts of active monomer, 2-5 parts of photoinitiator, 2-5 parts of fumed silica, 1-5 parts of epoxy zinc phosphate, and 3-6 parts of thermoplastic polyester elastomer; the active monomer is isobornyl acrylate.

[0019] In order to better achieve the purpose of the present invention, the present invention also provides a thermal insulation composite pipe prepared by the preparation process

[0020] In order to better achieve the purpose of the present invention, the present invention also provides a size detection device used in a preparation process, comprising a box:

[0021] The front and rear ends of the box are equipped with adjustable center calibration components for calibrating the center axis of the pipeline and adapting to pipelines of different sizes;

[0022] The adjustable center calibration component includes a synchronous adjustment component and a contact component. The synchronous adjustment component is connected to the box body. The synchronous adjustment component is connected with contact components for pipeline contact at equal intervals along the circumference.

[0023] The inner wall of the box is provided with a multi-point detection component for pipeline size detection.

[0024] Furthermore, the synchronous adjustment component includes a first motor, a fixed seat, a first transverse axis, a first bevel gear, a second bevel gear and a second transverse axis, both ends of the second transverse axis are fixedly connected to the second bevel gear, one end of the first transverse axis is fixedly connected to the first bevel gear, the first transverse axis, the second transverse axis, the second transverse axis and the first transverse axis are evenly arranged along the center of the pipeline, the first bevel gear of the first transverse axis is meshed with the second bevel gear connected to one end of the second transverse axis, and the second bevel gears connected to the other end of the second transverse axis are meshed with each other, the first transverse axis and the second transverse axis are rotatably connected to the fixed seat through bearings, the fixed seat and the first motor are fixedly connected to the box, the first motor is fixedly connected to the end of one group of the first transverse axes, and the contact assembly is connected to the first transverse axis and the second transverse axis.

[0025] Furthermore, the contact assembly includes a movable seat and rollers, the movable seat is fixedly mounted on the first transverse axis and the second transverse axis, and the outer end of the movable seat is fixedly connected to the rollers, and the rollers are arranged at equal intervals along the circumferential direction of the central axis of the pipeline.

[0026] Furthermore, the multi-point detection component includes an ultrasonic sensor, an arc guide rail, a support plate, a slider, an annular mounting plate, a second motor, a gear ring, an arc rack, a mounting seat and an annular movable plate. The top and the front and rear side walls of the box are fixedly connected to the support plate, the support plate is fixedly connected to the annular mounting plate, the side wall of the annular mounting plate is fixedly connected to the arc guide rail, the arc guide rail is slidingly connected to the slider at equal intervals along the circumferential direction, the slider is fixedly connected to four groups of annular movable plates, the side wall of the annular movable plate is fixedly connected to the mounting seat, an ultrasonic sensor is installed in the mounting hole of the mounting seat, the outer wall of the annular movable plate is fixedly connected to the arc rack, the support plate is installed with the second motor, and the driving end of the second motor is fixedly connected to the gear ring.

[0027] The present invention has the following technical effects:

[0028] 1. The present invention first forms a PE-RT having a spiral rib on the outer wall The inner tube (5mm) of type II material has spiral ribs that are beneficial to enhancing the strength of the inner tube on the one hand and convenient for installing the thermal insulation wrapping tube on the other hand; then a layer of 0.4mm thermal conductive silicone is brushed inside the spiral ribs of the inner tube to achieve the desired thermal conductivity; polyether polyol, isocyanate, polyarylate fiber, aluminum silicate fiber, foaming agent, polydopamine modified carbon nanotubes are extruded and formed, spherical silica aerogel particles are filled in the tube, and a thermal insulation wrapping tube with an outer diameter of 1.2mm and a thickness of 0.8mm is prepared to enhance the thermal insulation effect, compressive strength, heat resistance and other effects; then the thermal insulation wrapping tube that has not been completely cooled and shaped is wrapped around the outside of the inner tube, the longitudinal winding angle is controlled to be 40-43°, and the thermal insulation wrapping tube is cooled and shaped; a layer of 0.7mm light-cured buffer material is brushed on the outside of the thermal insulation wrapping tube; finally, a transparent polyethylene tube is put on, and a light-cured buffer layer is formed between the transparent polyethylene tube and the thermal insulation wrapping tube by a light-curing process. After forming, the thickness and outer diameter are detected by a size detection device, and the tube is packaged after passing the test. At the same time, since the thermal insulation wrap tube is spirally wound and filled with spherical silica aerogel particles, it has high compressive strength. After being squeezed, the thermal insulation wrap tube and light-curing buffer material have certain elastic shrinkage properties, and minor deformations can be automatically repaired.

[0029] 2. According to the present invention, the synchronous adjustment component of the adjustable center calibration component drives the contact component according to the size of the pipeline, and multiple groups of contact components contact different positions of the pipeline, so that the multiple groups of contact components are suitable for pipelines of different sizes, and the multiple groups of contact components are synchronously adjusted to ensure that the center axis of the pipeline is always in the set position. In addition, when the center axis of the pipeline is constant, the multi-point detection component facilitates the detection of the outer diameter and thickness of the pipeline, which is convenient for practical use. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 The three-dimensional size detection device of the present invention Figure 1 ;

[0032] Figure 2 It is a front view of the size detection device of the present invention;

[0033] Figure 3 The three-dimensional size detection device of the present invention Figure 2 ;

[0034] Figure 4 The three-dimensional size detection device of the present invention Figure 3 ;

[0035] Figure 5 The three-dimensional size detection device of the present invention Figure 4 ;

[0036] Figure 6 For along Figure 2 AA direction section Figure 1 ;

[0037] Figure 7 for Figure 6 A magnified view of the structure at B;

[0038] Figure 8 Schematic diagram of detection distance.

[0039] The numbers in the figure represent:

[0040] 1. Box body 2. Horizontal hole 3. Adjustable center calibration assembly 31. First motor 32. Fixed seat 33. First horizontal axis 34. First bevel gear 35. Second bevel gear 36. Movable seat 37. Second horizontal axis 38. Roller 4. Multi-point detection assembly 41. Ultrasonic sensor 42. Arc guide rail 43. Support plate 44. Slider 45. Annular mounting plate 46. Second motor 47. Ring gear 48. Arc rack 49. Mounting seat 410. Annular movable plate. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] The present invention will be further described below in conjunction with the embodiments.

[0043] Embodiment 1: In some embodiments, a process for preparing a thermal insulation composite pipe comprises the following steps:

[0044] 1. An inner tube (5 mm) made of PE-RT II material with spiral ribs on the outer wall;

[0045] 2. Brush a layer of 0.2mm thermal conductive silicone inside the spiral ribs of the inner tube;

[0046] 3. Prepare the thermal insulation wrapping pipe, the specific method is: weigh 42 parts of polyether polyol, 48 parts of isocyanate, 17 parts of polyarylate fiber, 42 parts of aluminum silicate fiber, 4 parts of foaming agent (methyl formate), 15 parts of polydopamine modified carbon nanotubes, and 1 part of catalyst (reactive amine catalyst), mix them and foam them through a mold, cool them to 55°C, and fill the tube with spherical silica aerogel particles; the particle size of the silica aerogel particles is 5 μm; the outer diameter of the thermal insulation wrapping pipe is 1.6 mm and the thickness is 0.5 mm;

[0047] The preparation method of polydopamine-modified carbon nanotubes is as follows: weigh 1 part of carbon nanotube powder and place it in a freezing treatment at minus 20°C for 15 hours; then disperse it in a mixed solution of 10 parts of Tris-HCl buffer (pH=7.5) and 75% ethanol to form a uniform dispersion; then drop 0.8 parts of dopamine hydrochloride into the dispersion, stir and react for 10 hours, and obtain polydopamine-modified carbon nanotubes after centrifugation, washing and drying;

[0048] Fourth, the heat preservation wrapping tube that has not been completely cooled and formed is then wrapped around the outside of the inner tube, and the longitudinal wrapping angle is controlled to be 40°. The heat preservation wrapping tube is then cooled and formed between the spiral ribs of the inner tube;

[0049] 5. Apply a layer of 0.5mm light-curing buffer material on the outside of the thermal insulation wrap tube;

[0050] The photocurable buffer material comprises the following raw materials in parts by weight: 40 parts of UV elastic resin (reference CN111269378B), 35 parts of active monomer (isobornyl acrylate), 2 parts of photoinitiator, 5 parts of fumed silica, 1 part of epoxy zinc phosphate, and 6 parts of thermoplastic polyester elastomer; the above raw materials are mixed evenly to obtain the photocurable buffer material;

[0051] 6. Finally, put on the transparent polyethylene tube, and use the light-curing process to form a light-curing buffer layer between the transparent polyethylene tube and the thermal insulation wrapping tube. After forming, the thickness and outer diameter are tested by size detection equipment, and packaging is carried out after passing the test.

[0052] Embodiment 2: In some embodiments, a process for preparing a thermal insulation composite pipe comprises the following steps:

[0053] 1. An inner tube (5 mm) made of PE-RT II material with spiral ribs on the outer wall;

[0054] 2. Brush a layer of 0.5mm thermal conductive silicone inside the spiral ribs of the inner tube;

[0055] 3. Prepare a thermal insulation wrapping tube, specifically: weigh 58 parts of polyether polyol, 35 parts of isocyanate, 22 parts of polyarylate fiber, 30 parts of aluminum silicate fiber, 10 parts of foaming agent (methyl formate), 11 parts of polydopamine-modified carbon nanotubes, and 0.5 parts of catalyst, mix them, and then foam them through a mold, cool them to 50°C, and fill the tube with spherical silica aerogel particles; the particle size of the silica aerogel particles is 10 μm; the outer diameter of the thermal insulation wrapping tube is 0.8 mm and the thickness is 1 mm;

[0056] The preparation method of polydopamine-modified carbon nanotubes is as follows: weigh 1 part of carbon nanotube powder and place it in a freezing treatment at minus 10°C for 10 hours; then disperse it in a mixed solution of 10 parts of Tris-HCl buffer (pH=7.5) and 75% ethanol to form a uniform dispersion; then drop 1.2 parts of dopamine hydrochloride into the dispersion, stir and react for 5 hours, and obtain polydopamine-modified carbon nanotubes after centrifugation, washing and drying;

[0057] Fourth, the heat preservation wrapping tube which has not been completely cooled and formed is then wrapped around the outside of the inner tube, and the longitudinal wrapping angle is controlled to be 43°. Then the heat preservation wrapping tube is cooled and formed between the spiral ribs of the inner tube;

[0058] 5. Apply a 1mm layer of light-cured buffer material on the outside of the thermal insulation wrap tube;

[0059] The photocurable buffer material comprises the following raw materials in parts by weight: 55 parts of UV elastic resin, 20 parts of isobornyl acrylate, 5 parts of photoinitiator, 2 parts of fumed silica, 5 parts of epoxy zinc phosphate, and 3 parts of thermoplastic polyester elastomer; the above raw materials are mixed evenly to obtain the photocurable buffer material;

[0060] 6. Finally, put on the transparent polyethylene tube, and use the light-curing process to form a light-curing buffer layer between the transparent polyethylene tube and the thermal insulation wrapping tube. After forming, the thickness and outer diameter are tested by size detection equipment, and packaging is carried out after passing the test.

[0061] Embodiment 3: In some embodiments, a process for preparing a thermal insulation composite pipe comprises the following steps:

[0062] 1. An inner tube (5 mm) made of PE-RT II material with spiral ribs on the outer wall;

[0063] 2. Brush a layer of 0.4mm thermal conductive silicone inside the spiral ribs of the inner tube;

[0064] 3. Prepare a thermal insulation wrapping tube, the specific method is: weigh 48 parts of polyether polyol, 41 parts of isocyanate, 20 parts of polyarylate fiber, 38 parts of aluminum silicate fiber, 6 parts of foaming agent (methyl formate), 12 parts of polydopamine modified carbon nanotubes, and 1 part of catalyst, mix them and foam them through a mold, cool them to 54°C, and fill the tube with spherical silica aerogel particles; the particle size of the silica aerogel particles is 8 μm; the outer diameter of the thermal insulation wrapping tube is 1.2 mm and the thickness is 0.8 mm;

[0065] The preparation method of polydopamine-modified carbon nanotubes is as follows: weigh 1 part of carbon nanotube powder and place it in a freezing treatment at minus 15°C for 12 hours; then disperse it in a mixed solution of 10 parts of Tris-HCl buffer (pH=7.5) and 75% ethanol to form a uniform dispersion; then drop 1 part of dopamine hydrochloride into the dispersion, stir and react for 7 hours, and obtain polydopamine-modified carbon nanotubes after centrifugation, washing and drying;

[0066] Fourth, the heat preservation wrapping tube that has not been completely cooled and formed is then wrapped around the outside of the inner tube, and the longitudinal wrapping angle is controlled to be 42°. The heat preservation wrapping tube is then cooled and formed between the spiral ribs of the inner tube;

[0067] 5. Apply a layer of 0.7mm light-curing buffer material on the outside of the thermal insulation wrap tube;

[0068] The photocurable buffer material comprises the following raw materials in parts by weight: 41 parts of UV elastic resin, 22 parts of isobornyl acrylate, 4 parts of photoinitiator, 4 parts of fumed silica, 2 parts of epoxy zinc phosphate, and 5 parts of thermoplastic polyester elastomer; the above raw materials are mixed evenly to obtain the photocurable buffer material;

[0069] 6. Finally, put on the transparent polyethylene tube, and use the light-curing process to form a light-curing buffer layer between the transparent polyethylene tube and the thermal insulation wrapping tube. After forming, the thickness and outer diameter are tested by size detection equipment, and packaging is carried out after passing the test.

[0070] Comparative Example 1: The difference from Example 3 is that the polydopamine-modified carbon nanotubes are replaced by ordinary carbon nanotubes.

[0071] Experimental Example: The performance of the thermal insulation composite pipes prepared in Examples 1-3 was tested, and the results are shown in Table 1.

[0072] Table 1 Performance test results

[0073] project Example 1 Example 2 Example 3 Comparative Example 1 Compressive strength(Mpa) 6.8 7.0 7.6 5.5 Thermal conductivity (W / m·k) 0.043 0.041 0.040 0.42 Thermal expansion coefficient (100℃) <![CDATA[0.451×10 -4 ]]> <![CDATA[0.475×10 -4 ]]> <![CDATA[0.483×10 -4 ]]> <![CDATA[0.614×10 -4 ]]> Heat deformation temperature(℃) 142.8 140.6 152.5 128.8

[0074] The present invention first forms a PE-RT with spiral ribs on the outer wall. The inner tube (5mm) of type II material has spiral ribs that are beneficial to enhancing the strength of the inner tube on the one hand and convenient for installing the thermal insulation wrapping tube on the other hand; then a layer of 0.4mm thermal conductive silicone is brushed inside the spiral ribs of the inner tube to achieve the desired thermal conductivity; polyether polyol, isocyanate, polyarylate fiber, aluminum silicate fiber, foaming agent, polydopamine modified carbon nanotubes are extruded and formed, spherical silica aerogel particles are filled in the tube, and a thermal insulation wrapping tube with an outer diameter of 1.2mm and a thickness of 0.8mm is prepared to enhance the thermal insulation effect, compressive strength, heat resistance and other effects; then the thermal insulation wrapping tube that has not been completely cooled and shaped is wrapped around the outside of the inner tube, the longitudinal winding angle is controlled to be 40-43°, and the thermal insulation wrapping tube is cooled and shaped; a layer of 0.7mm light-cured buffer material is brushed on the outside of the thermal insulation wrapping tube; finally, a transparent polyethylene tube is put on, and a light-cured buffer layer is formed between the transparent polyethylene tube and the thermal insulation wrapping tube by a light-curing process. After forming, the thickness and outer diameter are detected by a size detection device, and the tube is packaged after passing the test. At the same time, since the thermal insulation wrap tube is spirally wound and filled with spherical silica aerogel particles, it has high compressive strength. After being squeezed, the thermal insulation wrap tube and light-curing buffer material have certain elastic shrinkage properties, and minor deformations can be automatically repaired.

[0075] Example 4, please refer to Figure 1-8 , a size detection device used in a preparation process, comprising a box 1:

[0076] The front and rear ends of the box body 1 are both equipped with adjustable center calibration components 3 for calibrating the center axis of the pipeline and adapting to pipelines of different sizes;

[0077] The adjustable center calibration component 3 includes a synchronous adjustment component and a contact component. The synchronous adjustment component is connected to the box body 1. The synchronous adjustment component is connected with contact components for pipeline contact at equal intervals along the circumference.

[0078] The inner wall of the box body 1 is provided with a multi-point detection component 4 for pipeline size detection;

[0079] According to the size of the pipeline, the synchronous adjustment component of the adjustable center calibration component 3 drives the contact component, and multiple groups of contact components contact different positions of the pipeline, so that multiple groups of contact components are suitable for pipelines of different sizes, and the synchronous adjustment of multiple groups of contact components ensures that the center axis of the pipeline is always in the set position. In addition, when the center axis of the pipeline is constant, the multi-point detection component 4 facilitates the detection of the outer diameter and thickness of the pipeline, which is convenient for practical use;

[0080] The synchronous adjustment component includes a first motor 31, a fixed seat 32, a first transverse axis 33, a first bevel gear 34, a second bevel gear 35 and a second transverse axis 37, both ends of the second transverse axis 37 are fixedly connected to the second bevel gear 35, one end of the first transverse axis 33 is fixedly connected to the first bevel gear 34, the first transverse axis 33, the second transverse axis 37, the second transverse axis 37 and the first transverse axis 33 are evenly arranged along the center of the pipeline, the first bevel gear 34 of the first transverse axis 33 is meshed with the second bevel gear 35 connected to one end of the second transverse axis 37, and the second bevel gear 35 connected to the other end of the second transverse axis 37 is meshed with each other, the first transverse axis 33 and the second transverse axis 37 are rotatably connected to the fixed seat 32 through a bearing, the fixed seat 32 and the first motor 31 are fixedly connected to the housing 1, the first motor 31 is fixedly connected to the end of one group of the first transverse axis 33, and the contact component is connected to the first transverse axis 33 and the second transverse axis 37;

[0081] The contact assembly includes a movable seat 36 and a roller 38. The movable seat 36 is fixedly mounted on the first transverse axis 33 and the second transverse axis 37. The outer end of the movable seat 36 is fixedly connected to the roller 38. The rollers 38 are arranged at equal intervals along the circumferential direction of the central axis of the pipeline.

[0082] According to the size of the pipeline, the first motor 31 of the synchronous adjustment component of the adjustable center calibration component 3 drives a group of first transverse shafts 33 to rotate, the first transverse shaft 33 drives the second bevel gear 35 to drive a group of second transverse shafts 37 to rotate, one group of second transverse shafts 37 drives another group of second transverse shafts 37 to rotate through the second bevel gear 35, and another group of second transverse shafts 37 drives another group of first transverse shafts 33 to rotate through the second bevel gear 35 and the first bevel gear 34, the first transverse shaft 33 and the second transverse shaft 37 drive the movable seat 36 of the contact component to rotate, the movable seat 36 drives the roller 38 to rotate, and the roller 38 contacts with different positions of the pipeline, so that multiple groups of contact components are suitable for pipelines of different sizes, and the synchronous adjustment of multiple groups of contact components realizes that the center axis of the pipeline is always in the set position

[0083] The multi-point detection component 4 includes an ultrasonic sensor 41, an arcuate guide rail 42, a support plate 43, a slider 44, an annular mounting plate 45, a second motor 46, a gear ring 47, an arcuate rack 48, a mounting seat 49 and an annular movable plate 410. The top and the front and rear side walls of the box body 1 are fixedly connected with the support plate 43, the support plate 43 is fixedly connected with the annular mounting plate 45, the side wall of the annular mounting plate 45 is fixedly connected with the arcuate guide rail 42, the arcuate guide rail 42 is slidably connected with the slider 44 at equal intervals along the circumferential direction, the slider 44 is fixedly connected with four groups of annular movable plates 410, the side wall of the annular movable plate 410 is fixedly connected with the mounting seat 49, the ultrasonic sensor 41 is installed in the mounting hole of the mounting seat 49, the outer wall of the annular movable plate 410 is fixedly connected with the arcuate rack 48, the support plate 43 is installed with the second motor 46, and the driving end of the second motor 46 is fixedly connected with the gear ring 47;

[0084] During testing:

[0085] Record the first reflection time T1 and the second reflection time T2 received by the ultrasonic sensor 41 at position A, and record the third reflection time T3 received by the ultrasonic sensor 41 at position B. The ultrasonic sensor 41 at position A is opposite to the ultrasonic sensor 41 at position B.

[0086] D1=(V1*T1) / 2;

[0087] D2=(V1*T3) / 2;

[0088] D4 = D0-D1-D2;

[0089] D3 = (V2*(T2-T1)) / 2;

[0090] D0 is the distance between the ultrasonic sensor 41 at position A and the ultrasonic sensor 41 at position B, D1 is the distance between the ultrasonic sensor 41 at position A and the pipe, D2 is the distance between the ultrasonic sensor 41 at position B and the pipe, and D4 is the pipe diameter;

[0091] V1 is the propagation speed of ultrasonic waves in the air, V2 is the propagation speed of ultrasonic waves in the pipe, and D3 is the thickness of the pipe;

[0092] The above method can accurately grasp the pipe diameter D4 and pipe thickness D3;

[0093] At the same time, the support plate 43 drives the ring gear 47 to rotate, the ring gear 47 drives the arc-shaped rack 48 to rotate, and with the cooperation of the arc-shaped guide rail 42 and the slider 44, the arc-shaped rack 48 drives the annular movable plate 410 to rotate, the annular movable plate 410 drives the mounting seat 49 to rotate, and the mounting seat 49 drives the ultrasonic sensor 41 to rotate. The ultrasonic sensor 41 rotates along the center of the pipeline, which facilitates the adjustment of the ultrasonic sensor 41 to different positions for detection, thereby improving adaptability.

[0094] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A process for preparing a thermal insulation composite pipe, characterized in that: The following steps are involved:

1. The inner tube is made of PE-RT II material with spiral ribs on the outer wall; 2. Brush a layer of 0.2-0.5mm thermal conductive silicone inside the spiral ribs of the inner tube; 3. Prepare the thermal insulation winding pipe, the specific method is: weigh 42-58 parts of polyether polyol, 35-48 parts of isocyanate, 17-22 parts of polyarylate fiber, 30-42 parts of aluminum silicate fiber, 4-10 parts of foaming agent, 11-15 parts of polydopamine modified carbon nanotubes, 0.5-1 parts of catalyst, mix and foam through a mold, cool to 50-55 ° C, and fill the tube with spherical silica aerogel particles; Fourth, the heat preservation wrapping tube that has not been completely cooled and formed is then wrapped around the outside of the inner tube, and the longitudinal wrapping angle is controlled to be 40-43°. The heat preservation wrapping tube is then cooled and formed between the spiral ribs of the inner tube; 5. Apply a layer of 0.5-1mm light-curing buffer material on the outside of the thermal insulation wrap tube; 6. Finally, put on the transparent polyethylene tube, and use the curing process to form a light-cured buffer layer between the transparent polyethylene tube and the thermal insulation wrapping tube. After forming, the thickness and outer diameter are tested by size detection equipment, and packaging is carried out after passing the test.

2. The process for preparing the thermal insulation composite pipe according to claim 1, characterized in that: The particle size of the silica aerogel particles is 5-10 μm.

3. The process for preparing the thermal insulation composite pipe according to claim 2, characterized in that: The outer diameter of the thermal insulation winding tube is 0.8-1.6 mm, and the thickness is 0.5-1 mm.

4. The process for preparing the thermal insulation composite pipe according to claim 3, characterized in that: in, The preparation method of polydopamine-modified carbon nanotubes is as follows: weigh 1 part of carbon nanotube powder and place it in a freezing treatment at minus 20°C to minus 10°C for 10-15 hours; then disperse it in a mixed solution of 10 parts of Tris-HCl buffer (pH=7.5) and 75% ethanol, and mix it into a uniform dispersion; then add 0.8-1.2 parts of dopamine hydrochloride dropwise to the dispersion, stir and react for 5-10 hours, and obtain polydopamine-modified carbon nanotubes after centrifugation, washing and drying.

5. The process for preparing the thermal insulation composite pipe according to claim 4, characterized in that: The photocurable buffer material comprises the following raw materials in parts by weight: 40-55 parts of UV elastic resin, 20-35 parts of active monomer, 2-5 parts of photoinitiator, 2-5 parts of fumed silica, 1-5 parts of epoxy zinc phosphate, and 3-6 parts of thermoplastic polyester elastomer; the active monomer is isobornyl acrylate.

6. A thermal insulation composite pipe prepared by the preparation process according to any one of claims 1 to 5.

7. A size detection device used in the preparation process according to claim 5, comprising a box (1), characterized in that: The front and rear ends of the box body (1) are both equipped with adjustable center calibration components (3) for calibrating the center axis of the pipeline and adapting to pipelines of different sizes; The adjustable center calibration component (3) comprises a synchronous adjustment component and a contact component, the synchronous adjustment component is connected to the box body (1), and the synchronous adjustment component is connected to the contact component for pipeline contact at equal intervals along the circumference; The inner wall of the box body (1) is provided with a multi-point detection component (4) for pipeline dimension detection.

8. The size detection device according to claim 7, characterized in that: The synchronous adjustment component comprises a first motor (31), a fixing seat (32), a first transverse shaft (33), a first bevel gear (34), a second bevel gear (35) and a second transverse shaft (37), both ends of the second transverse shaft (37) are fixedly connected to the second bevel gear (35), one end of the first transverse shaft (33) is fixedly connected to the first bevel gear (34), the first transverse shaft (33), the second transverse shaft (37) and the first transverse shaft (33) are evenly arranged along the center of the pipeline, and the first bevel gear (34) of the first transverse shaft (33) is fixedly connected to the second bevel gear (35). 4) a second bevel gear (35) connected to one end of the second transverse shaft (37) is meshed and connected, the second bevel gears (35) connected to the other end of the second transverse shaft (37) are meshed and connected with each other, the first transverse shaft (33) and the second transverse shaft (37) are rotatably connected to the fixed seat (32) through a bearing, the fixed seat (32) and the first motor (31) are fixedly connected to the housing (1), the first motor (31) is fixedly connected to the end of one group of the first transverse shaft (33), and the contact assembly is connected to the first transverse shaft (33) and the second transverse shaft (37).

9. The size detection device according to claim 8, characterized in that: The contact assembly comprises a movable seat (36) and a roller (38), wherein the movable seat (36) is fixedly mounted on the first transverse axis (33) and the second transverse axis (37), and the outer end of the movable seat (36) is fixedly connected with the roller (38), and the rollers (38) are arranged at equal intervals along the circumferential direction of the central axis of the pipeline.

10. The size detection device according to claim 7, characterized in that: The multi-point detection assembly (4) comprises an ultrasonic sensor (41), an arc-shaped guide rail (42), a support plate (43), a slider (44), an annular mounting plate (45), a second motor (46), a gear ring (47), an arc-shaped rack (48), a mounting seat (49) and an annular movable plate (410). The top and the front and rear side walls of the box body (1) are fixedly connected with the support plate (43), the support plate (43) is fixedly connected with the annular mounting plate (45), and the side wall of the annular mounting plate (45) is fixedly connected with the arc-shaped guide rail (42). ), the arc-shaped guide rail (42) is connected to a slider (44) along the circumferential direction at equal intervals and limited sliding connection, the slider (44) is fixedly connected to four groups of annular movable plates (410), the side wall of the annular movable plate (410) is fixedly connected to a mounting seat (49), an ultrasonic sensor (41) is installed in the mounting hole of the mounting seat (49), the outer wall of the annular movable plate (410) is fixedly connected to an arc-shaped rack (48), the support plate (43) is installed with a second motor (46), and the driving end of the second motor (46) is fixedly connected to a gear ring (47).

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