Heat preservation module prefabrication process

Abstract

The invention relates to the technical field of thermal insulation modules, in particular to a thermal insulation module prefabricating process which comprises the following steps: prefabricating a thermal insulation layer: infiltrating an inorganic fiber felt serving as a base material with an aerogel solution, carrying out supercritical reaction in a high-temperature and high-pressure container, and drying, prefabricating a moisture-proof layer: prefabricating the moisture-proof layer with inorganic fiber cloth serving as a base material and Teflon such as polytetrafluoroethylene, the stainless steel is subjected to laser cutting and blanking, then a heat preservation layer and a damp-proof layer are put into the stainless steel, then electric welding and splicing are conducted, and the heat preservation module is manufactured. The invention provides lasting hydrophobicity and high-temperature stability, and overcomes the defects that the silicon dioxide aerogel body is fragile and low in mechanical strength, and the organic hydrophobic group is easy to decompose at high temperature.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thermal insulation modules, in particular to a prefabrication process of thermal insulation modules. BACKGROUND

[0002] At present, in the field of nuclear industry, especially for thermal insulation materials, it is required to have ultra-low thermal conductivity (such as ≤0.020 W / m·K), high temperature resistance (≥350℃) and excellent moisture resistance, mechanical strength, and traditional thermal insulation materials are difficult to meet all the above indicators at the same time. Silica aerogel has ultra-insulation performance due to its unique nano-porous structure, but it is fragile in itself, has low mechanical strength, and the organic hydrophobic group is easy to decompose at high temperature. These defects limit its application in high stress environment.

[0003] In addition, high standard moisture resistance and chemical resistance require a high-performance protective layer that must provide long-lasting hydrophobicity and high-temperature stability without affecting the performance of the thermal insulation layer. SUMMARY

[0004] Therefore, in view of the above problems, the present application provides a prefabrication process of thermal insulation modules, which solves the above technical problems.

[0005] To achieve the above purpose, the present application adopts the following technical scheme: a prefabrication process of thermal insulation modules, comprising the following steps:

[0006] S1, prefabricating a thermal insulation layer: taking inorganic fiber felt as a base material, soaking it with aerogel liquid, and preparing it in a high-temperature high-pressure container through supercritical reaction and drying;

[0007] S2, prefabricating a moisture-proof layer: taking inorganic fiber cloth as a base material, soaking it with Teflon, such as polytetrafluoroethylene, and preparing it in a reaction furnace through reaction, multiple shaping and drying;

[0008] S3, sewing fabric on the outer side of the thermal insulation layer and the moisture-proof layer;

[0009] S4, prefabricating a protective layer: laser cutting and blanking of steel material, rolling and bending the stainless steel material, then placing the thermal insulation layer and the moisture-proof layer into the stainless steel material, and then electrically welding and assembling to form a thermal insulation module.

[0010] Further, in S1, the aerogel precursor liquid: using acid-base two-step catalysis method, the molar ratio of the silicon source precursor and the hydrophobic agent is accurately controlled in the range of 1.2-1.5, after gelation, 5%-10% mass fraction of inorganic high-temperature ceramic binder precursor and 15%-25% mass fraction of hollow microbeads are introduced, the solvent exchange and multiple surface modification optimization normal pressure drying path is adopted to inhibit the pore collapse caused by capillary force, and two-stage thermal curing is adopted: low-temperature curing 80-120 DEG C to stabilize the hydrophobic group, and high-temperature sintering 250-300 DEG C to activate the ceramic binder to form a high-strength inorganic skeleton.

[0011] Further, in s2, the aerogel liquid: using PTFE aqueous dispersion liquid with a solid content of 55-65%, pouring into the impregnation tank, passing the high-strength glass fiber cloth through the impregnation tank, keeping the impregnation liquid temperature at 20-25 DEG C, drying the impregnated fabric at 90-100 DEG C until the weight is constant (T5), removing the moisture, baking at 230-250 DEG C to remove the non-ionic surfactant used in the dispersion liquid, and sintering at 380-400 DEG C to melt the PTFE particles and form a continuous film, the holding time of this step is 2-5 min per layer, so that the mechanical anchoring bond between PTFE and the substrate is achieved, and the impregnation, drying, baking and sintering cycles are repeated according to the required PTFE content and thickness.

[0012] Further, in s4, first, the stainless steel plate is rolled and bent into a left half sheath that can surround the thermal insulation layer and the moisture-proof layer, and a right half sheath that can surround the thermal insulation layer and the moisture-proof layer, the left half sheath and the right half sheath are provided with horizontal grooves at the bottom for surrounding the lateral side pipes of the external three-way pipe, the left half sheath and the right half sheath are provided with vertical grooves at the top for surrounding the top of the external three-way pipe, the left half sheath is provided with lower extension pieces on the upper and lower sides of the horizontal grooves, the left half sheath is provided with upper extension pieces on the front and rear sides of the vertical grooves, then the hook blocks are welded on the upper and lower extension pieces, and the buckle mechanism that is buckled with the hook blocks is welded on the right half sheath.

[0013] Further, in the S1 step, the aerogel precursor liquid is further introduced with 5%-15% mass fraction of silicon carbide powder as a heat radiation shading agent in the mixing stage, and the high shear process is used to uniformly disperse the silicon carbide powder in the precursor liquid.

[0014] Further, the average particle size of the silicon carbide powder is 1-10 microns.

[0015] By adopting the foregoing technical solutions, the application has the following beneficial effects:

[0016] The prefabrication process of the heat preservation module sets the heat preservation layer and the moisture-proof layer, and a set of nanometer hole composite heat insulation material preparation method can be industrialized and enlarged, and the super low thermal conductivity performance is realized through normal pressure drying, and the mechanical strength and temperature resistance grade are improved through the ceramic adhesive, the prepared heat preservation layer and moisture-proof layer are placed in the protective layer, so that the durable hydrophobicity and high temperature stability are provided under the premise of not affecting the performance of the heat insulation layer, and the defects of the fragile silica aerogel body, low mechanical strength and easy decomposition of the organic hydrophobic group at high temperature are solved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the heat preservation layer detection diagram of the application;

[0018] Figure 2 is the moisture-proof layer detection diagram of the application;

[0019] Figure 3 is the schematic diagram of the heat preservation layer structure of the application;

[0020] Figure 4 is the schematic diagram of the heat preservation layer explosion state structure of the application;

[0021] Figure 5 is the schematic diagram of the hook block and buckle mechanism explosion state structure of the application;

[0022] Figure 6 is the schematic diagram of the buckle mechanism explosion state structure of the application;

[0023] Figure 7 is the schematic diagram of the right half sheath structure section of the application;

[0024] Figure 8 is the schematic diagram of the crusher structure top view of the application;

[0025] Figure 9 is the schematic diagram of the crusher structure of the application;

[0026] Figure 10 is the schematic diagram of the crusher local structure of the application;

[0027] Figure 11 is the schematic diagram of the crusher local structure section of the application;

[0028] Figure 12 is the schematic diagram of the replaceable grinding head and groove type pressure plate local structure plane of the application;

[0029] Figure 13 is the schematic diagram of the A enlarged structure in the application. Figure 12 DETAILED DESCRIPTION

[0030] The application will be further described in combination with the drawings and specific embodiments.​

[0031] Reference Figures 1 to 13 The embodiment provides a heat preservation module prefabrication process, comprising the following steps:

[0032] S1, prefabricating a heat preservation layer: using inorganic fiber felt as a base material, the base material is infiltrated with aerogel original glue solution, and the base material is prepared through supercritical reaction and drying in a high-temperature and high-pressure container;

[0033] S2, prefabricating a moisture-proof layer: using inorganic fiber cloth as a base material, the base material is infiltrated with Teflon (polytetrafluoroethylene), and the base material is prepared through reaction, multiple shaping and drying in a reaction furnace;

[0034] S3, sewing fabric on the outer side of the heat preservation layer and the moisture-proof layer;

[0035] S4, prefabricating a protection layer: laser cutting and blanking of stainless steel material, rolling and bending of the stainless steel material, then placing the heat preservation layer and the moisture-proof layer into the stainless steel material, and then electrically welding and assembling to prepare the heat preservation module.

[0036] By placing the heat preservation layer and the moisture-proof layer into the protection layer, the deficiencies of the prior art are overcome, and a nanometer hole composite heat insulation material preparation method is provided, which can be industrialized and enlarged, realizes ultra-low thermal conductivity through normal pressure drying, and improves mechanical strength and temperature resistance through ceramic adhesive.

[0037] In S1, the aerogel original glue solution: an acid-base two-step catalysis method is adopted, first, acid hydrolysis is performed, structural precursor tetraethoxysilane (TEOS) and hydrophobic agent methyl triethoxysilane (MTES) are mixed in an alcohol solvent at a molar ratio of 1.2-1.5, an acid catalyst (such as HNO3 or HCl) is added to adjust the pH value to 2.0, and the hydrolysis reaction (T1) is performed at 25℃±2℃ for 1.5-2.0h to maximize the coverage of surface hydrophobic groups; then, alkali gel initiation is performed, an alkali catalyst (such as NH4OH) is quickly added to raise the pH value of the system to 8.5, a condensation reaction is initiated, and a SiO2 network is formed;

[0038] The aged wet gel is mixed with reinforcing materials, the reinforcing materials include: high-temperature ceramic adhesive precursor, hollow glass microspheres (HGM), and chopped quartz or glass fiber, wherein the high-temperature ceramic adhesive precursor (ZrO2 or Al2O3 modified silica system) accounts for 5%-10% of the total mass of SiO2 solid; the hollow glass microspheres (HGM) are used as a radiation heat shield and account for 15%-25% of the total mass of the dry composite material; the chopped quartz or glass fiber has a length of 1-3mm and accounts for 2%-5% of the total mass; finally, the composite mixture is continuously cast onto an inorganic fiber felt base material or a mold;

[0039] After casting, the wet composite material is immersed in a low-surface-tension non-polar solvent (n-hexane or toluene) to replace the solvent (T SE After solvent exchange, the gel is treated with a hydrophobic agent (e.g. trimethylchlorosilane, TMCS) multiple times to achieve an ultra-high density of hydrophobic functional group coverage, ensuring a final water contact angle WCA > 145°, then low-temperature curing, drying at 80-120°C under normal pressure for 12-24h to remove the solvent and cure the Si-CH3 hydrophobic group, achieving hydrophobicity curing, and then high-temperature sintering to activate the ceramic binder, raising the temperature to 250-300°C for 4.0-8.0h (T4), which aims to fully activate the high-temperature ceramic binder to form a strong structural framework, thus making the insulation layer, ensuring long-term stability of the material at 400°C, and forming a highly dense and chemical corrosion-resistant PTFE melt film on the inorganic fiber cloth through multiple rounds of dip coating and high-temperature sintering processes.

[0040] In s2, the aerogel liquid: use PTFE aqueous dispersion, solid content about 59%, can be diluted according to the requirements of the finished product, the dispersion must be stirred gently with a stirrer for 30 minutes or a rolling drum, then filtered through a nylon fabric filter before use;

[0041] First, dip coating, high-strength glass fiber cloth through the immersion tank, the temperature of the immersion liquid is kept at 20-25°C;

[0042] Then dry, dry the immersed fabric at 90-100°C until the weight is constant (T5) to remove the moisture; then bake at 230-250°C to remove the non-ionic surfactant used in the dispersion; then sinter melt at 380-400°C to melt the PTFE particles and form a continuous film, the holding time of this step is 2-5min per layer to ensure mechanical anchoring bonding between PTFE and the substrate, and this sintering process forms the final chemical corrosion-resistant and super-hydrophobic barrier; according to the required PTFE content and thickness, repeat the cycle of dip coating, drying, baking and sintering to ensure that the final product meets the requirement of <0.5% moisture absorption rate.

[0043] The protection layer includes a left half sheath 1 surrounding the thermal insulation layer and the moisture-proof layer, and a right half sheath 2 surrounding the thermal insulation layer and the moisture-proof layer, the bottom of the left half sheath 1 and the right half sheath 2 is provided with a horizontal groove 3 for surrounding the lateral side pipe of the external three-way pipe, the top of the left half sheath 1 and the right half sheath 2 is provided with a vertical groove 4 for surrounding the top of the external three-way pipe, the left half sheath 1 is provided with a lower extension piece 101 on the upper and lower sides of the horizontal groove 3, the left half sheath 1 is provided with an upper extension piece 102 on the front and rear sides of the vertical groove 4, the upper extension piece 102 and the lower extension piece 101 are provided with a hook block 5, the right half sheath 2 is provided with a buckle mechanism 6 buckled with the hook block 5, the thermal insulation layer and the moisture-proof layer are prefabricated into a shape that can be placed in the protection layer, and then the protection layer is wrapped around the thermal insulation layer and the moisture-proof layer, the protection layer is made of stainless steel and can be attached to the external pipe, the left half sheath 1 and the right half sheath 2 are fixed by the cooperation of the hook block and the buckle mechanism, which can realize quick disassembly and assembly, and the protection layer fixed on the external pipe can facilitate the disassembly and assembly of the thermal insulation module, and the maintenance personnel can disassemble and assemble the thermal insulation module conveniently.

[0044] The prepared thermal insulation module meets high standard requirements (such as vibration, toxicity, mold, corrosion resistance) of ships and the like, and the designed detachable and high-performance thermal insulation assembly has the core target of realizing high efficiency, energy saving, light weight, long service life and reusability.

[0045] The thermal insulation layer b has extreme thermal insulation: the thermal conductivity coefficient is extremely low, 0.018-0.036 W / m.K, which is much better than traditional materials such as aluminum silicate fiber and rock wool, at high temperature, the thickness of the thermal insulation layer can be reduced by about 50%, which is very suitable for the narrow space of the ship environment, is safe and environmentally friendly: A-class non-combustible, non-toxic, no decomposition of harmful substances at high temperature, mold-proof and corrosion-resistant, meets the most stringent fire safety standards of ships, is durable and light: high structural strength, compression and tension resistance, service life up to 30 years or more. At the same time, the reduced amount makes the overall weight light, the volume small, convenient for transportation and installation.

[0046] The moisture-proof layer a has high moisture-proof: the water repellency is as high as 99% or more, and can withstand 300℃ high temperature for a long time without failure, the sealing is strengthened: effectively preventing the overflow of internal aerogel dust, the mechanical properties are good: high tensile strength, convenient for wrapping, construction and sewing, and the edges are not easy to spread. The thermal insulation layer and the moisture-proof layer can be referred to the test result table Figure 1 and Figure 2 .

[0047] The protection layer is a stainless steel plate, which is the outermost layer and mainly provides mechanical protection, has high mechanical strength, corrosion resistance, salt spray resistance, excellent radiation resistance, and is suitable for nuclear areas.

[0048] Composite aerogel thermal insulation material through the scientific combination of nanometer aerogel felt, Teflon cloth and stainless steel plate, finally realizes: super high efficient thermal insulation and energy saving lightweight and space saving A level fire safety and non-toxic environmental protection long-term moisture-proof, anti-condensation high mechanical strength and long service life excellent corrosion resistance, radiation resistance performance can be repeatedly disassembled, easy to overhaul and maintenance.

[0049] The upper and lower extension pieces 102 and 101 have a bending mark 1a at the boundary position of the right half sheath 2, and the left half sheath 1 is fixedly provided with a rivet 1b at the position of the bending mark 1a, so as to avoid being affected by the pulling force of the buckle mechanism 6, and the right half sheath 2 close to the buckle mechanism 6 is deformed by the pulling force; reference Figure 7 , the thermal insulation layer a is aerogel felt, and the moisture-proof layer b is Teflon cloth.

[0050] The buckle mechanism 6 includes a hinge piece 601 provided on the right half sheath 2, a hand lock 602 rotatably provided on the top of the hinge block, a rotating piece 603 rotatably provided on the side of the hand lock 602 away from the hinge piece 601, a threaded column 604 provided in the middle of the rotating piece 603, a buckle block 605 provided on the outer side of the threaded column 604 and matched with the hook block 5, and a nut 606 provided on the side of the threaded column 604 away from the rotating piece 603.

[0051] The buckle block 605 is screwed on the outer side of the threaded column 604, the threaded column 604 is fixedly provided at the position of the rotating piece 603, and in use, the hand lock 602 is pulled upward to increase the included angle between the hand lock 602 and the hinge piece 601, then the buckle block 605 is rotated, the buckle block 605 is rotated on the outer side of the threaded column 604, after reaching the appropriate position, since the threaded column 604 is rotatably connected with the hand lock 602 through the rotating piece 603, the position of the buckle block 605 can be pressed and rotated into the hook block 5, then the hand lock 602 is pulled downward, the buckle block 605 and the hook block 5 are fixedly locked, and then the nut 606 is tightened on the side of the threaded column 604. This structure can adjust the distance between the rotating piece 603 and the hook block 5, compared with the traditional buckle mechanism 6 with fixed position, the requirement for installation precision is low, and the thermal insulation module of different sizes can be well adapted, which is also convenient for use, disassembly and assembly.

[0052] The use process can also be adjusted to that the rotating piece 603 is fixedly connected with the threaded column 604, and the threaded column 604 is threadedly connected with the rotating piece 603, in use, the buckle block 605 drives the threaded column 604 to move away from the hook block 5, so as to adjust the distance between the hook block 5 and the buckle block 605, the buckle block 605 is usually bent from the threaded column 604, and is easy to be deformed in use, and the separated buckle block 605 is more stable in connection.

[0053] The hinge piece 601 is provided with a bending piece 607 below the hand lock 602, the bending piece 607 is provided with a first square hole 608, the hand lock 602 is provided with a second square hole 609, the bending piece 607 is provided with a torsion block 610 for passing through the first square hole 608 and the second square hole 609, the bottom surface of the torsion block 610 is provided with a rotating column 611, the rotating column 611 is provided with a limiting block 612 below the bending piece 607, the limiting block 612 and the bending piece 607 are provided with a spring 613.

[0054] Before use, the spring 613 is placed on the top surface of the limiting block 612, and then the torsion block 610 and the rotating column 611 are respectively passed through the first square hole 608 and the second square hole 609, when the lock block needs to be moved, the torsion block 610 is rotated, the position of the torsion block 610 is aligned with the position of the second square hole 609, at this time, the hand lock 602 can be separated from the torsion block 610 and moved, when the hand lock 602 needs to be fixed, the torsion block 610 is rotated by 90 degrees, at this time, the torsion block 610 and the second square hole 609 are vertically crossed, and the top surface of the hand lock 602 is blocked, under the action of the spring 613, the torsion block 610 is pressed to tightly adhere to the top surface of the hand lock 602, avoiding that the hand lock 602 accidentally turns outwards to cause that the left half sheath 1 and the right half sheath 2 are not tightly adhered to the external tee pipe.

[0055] In the S1 step, the aerogel original glue liquid is further introduced with 5-15% mass fraction of silicon carbide powder as a heat radiation light shielding agent in the mixing stage, and a high shear process is used to uniformly disperse the silicon carbide powder in the original glue liquid, and the average particle size of the silicon carbide powder is 1-10 microns; in order to solve the problem of the decrease of the thermal insulation performance of the above-mentioned thermal insulation module due to the increase of the proportion of heat radiation heat transfer under the condition of ultra-high temperature, such as >600℃, a further performance enhancement scheme is provided.

[0056] In order to achieve the purpose, a micron-level heat radiation light shielding agent is additionally introduced, specifically, 5-15% mass fraction of silicon carbide powder is introduced into the original glue liquid in the mixing stage before gelation.

[0057] The silicon carbide powder is uniformly dispersed and finally solidified in the nanoporous skeleton of the aerogel, and the high-temperature heat radiation is significantly inhibited: as an excellent infrared light shielding agent, the silicon carbide powder can effectively scatter, absorb and re-radiate heat at high temperature, greatly weakening the heat radiation penetrating the aerogel, so that the thermal insulation module can still maintain a very low thermal conductivity in a high-temperature environment above 800℃, and the high-temperature thermal insulation performance can be improved by more than 40% compared with the sample without adding the silicon carbide powder.

[0058] Enhance the structural strength and upper limit of temperature resistance: high hardness of silicon carbide powder as a ceramic reinforcing phase, filling in the aerogel network, can further enhance the compressive strength and high temperature structural stability of the composite insulation layer, effectively inhibit the sintering shrinkage of the material at high temperature, and the upper limit of continuous use temperature of the module is increased to more than 1000℃.

[0059] Preparation of composite aerogel original glue liquid: (a) using acid-base two-step catalysis method, the molar ratio of TEOS and MTES is accurately controlled to 1.35, hydrolysis and polycondensation are carried out in ethanol solvent to form initial silica sol;

[0060] (b) The high-purity silicon carbide block is coarsely broken by a crusher and finely ground by an air flow mill to produce silicon carbide powder. Take the silicon carbide powder equivalent to 12% of the total mass of the final solid phase, pre-wet it with a small amount of anhydrous ethanol and a dispersant, then place it in a high-shear dispersion emulsifier and disperse it at a speed of 20000 rpm for 20 minutes to form a uniform and stable silicon carbide suspension;

[0061] (c) The prepared silicon carbide suspension, inorganic high-temperature ceramic binder precursor with a mass fraction of 8%, and hollow microbeads with a mass fraction of 18% are slowly added to the silica sol of step (a);

[0062] (d) Under continuous stirring, add the alkaline catalyst to adjust the pH value of the system to 6.5-7.0. After uniform rapid stirring, it is immediately used in the subsequent infiltration process.

[0063] Infiltration, molding, drying and heat treatment: the subsequent steps of fiber mat infiltration, gel aging, solvent exchange, surface modification, normal pressure drying and two-stage heat curing are consistent with the basic process and are not described here.

[0064] The prepared reinforced composite insulation layer has a stable thermal conductivity of 0.048 W / (m·K) at 800℃ high temperature environment, which is about 45% lower than the basic process sample, showing excellent high temperature thermal insulation stability.

[0065] (b) the crusher comprises a main frame 701, a fixed crushing roller 702 rotatably arranged at one end of the main frame 701, a movable sliding block 703 slidably arranged at the other end of the main frame 701, a movable crushing roller 704 pivotally arranged above the movable sliding block 703, a displacement actuator 705 for driving the movable sliding block 703 to linearly displace, a set of static shields 706 arranged on the main frame 701 to surround the front, rear and left sides of the fixed crushing roller 702, a following shield 707 fixed to the outside of the movable sliding block 703, a finished product discharge port 708 arranged at the bottom of the main frame 701, a main transmission gear 709 arranged at the front end of the fixed crushing roller 702, a driven transmission gear 710 arranged at the front end of the movable crushing roller 704, a central power gear 711 rotatably arranged on the main frame 701 and simultaneously meshing with the main transmission gear 709 and the driven transmission gear 710, and a main drive motor 712 for providing power to the central power gear 711, the tooth width of the central power gear 711 is designed to be larger than the dynamic gap between the main transmission gear 709 and the driven transmission gear 710, so that the driven transmission gear 710 can laterally translate on the tooth surface of the central power gear 711.

[0066] The operation process of the device starts from the main drive motor 712 providing rotary power to the central power gear 711, then the central power gear 711 synchronously distributes power to the main transmission gear 709 and the driven transmission gear 710 through meshing transmission, so that the two gears rotate synchronously, and then drive the fixed crushing roller 702 and the movable crushing roller 704 to rotate towards each other, respectively. When the material is put into the main frame 701, it will be crushed by the counter-roller extrusion of the two rotating crushing rollers. If it is necessary to adjust the distance between the fixed crushing roller 702 and the movable crushing roller 704 in real time according to the length characteristics of the input silicon carbide block, the displacement actuator 705 will drive the movable sliding block 703 to move laterally. When the movable sliding block 703 moves, the movable crushing roller 704 and the driven transmission gear 710 carried thereon also move together. Thanks to the wide tooth design mentioned above, the driven transmission gear 710 can always be effectively power meshed with the central power gear 711 during the movement process, realizing online dynamic adjustment of the crushing gap.

[0067] In addition, the following shield 707 is structurally located between the front and rear parts of the static shield 706. When the movable sliding block 703 moves, the following shield 707 will synchronously slide in the channel formed by the static shield 706. This linkage design ensures that the working area between the fixed crushing roller 702 and the movable crushing roller 704 is always maintained in a closed state without interfering with the movement of the following shield 707 and the movable crushing roller 704.

[0068] Regarding the surface fine structure of the fixed crushing wheel 702, a plurality of ladder-shaped grinding pedestals 713 are arranged on the outer circumference of the fixed crushing wheel 702, and the top of each ladder-shaped grinding pedestal 713 is connected to a replaceable grinding head 714 through a thread. The working surface of the replaceable grinding head 714 away from the pedestal is arc-shaped. In the gap between each ladder-shaped grinding pedestal 713 on the surface of the fixed crushing wheel 702, a recessed pressure plate 715 is embedded and installed. The central region of the recessed pressure plate 715 is processed with an arc-shaped receiving interface 716 for cooperating with the replaceable grinding head 714. The left and right ends of the recessed pressure plate 715 are both provided with a stepped through hole 717, and the stepped through hole 717 of the recessed pressure plate 715 is provided with an adjusting bolt 718 connected with the fixed crushing wheel 702. Between the recessed pressure plate 715 and the stepped through hole 717, a buffer spring 719 is assembled. The fixed crushing wheel 702 and the movable crushing wheel 704 adopt the same structure.

[0069] During the rotation of the fixed crushing roller 702 and the movable crushing roller 704, the replaceable grinding head 714 installed on the ladder-shaped grinding base 713 will periodically approach the groove-shaped pressure plate 715. Due to the existence of the arc-shaped receiving interface 716 on the groove-shaped pressure plate 715, an efficient extrusion crushing area is formed between the replaceable grinding head 714 and the arc-shaped receiving interface 716. The top of the ladder-shaped grinding base 713 is the fastest wearing part, and the design of the replaceable grinding head 714 prolongs the service life of the main body. The arc-shaped replaceable grinding head 714 not only wears more evenly, but also has stronger fatigue resistance. In cooperation with the groove-shaped pressure plate 715, the groove-shaped pressure plate 715 forms an elastic connection with the fixed crushing roller 702 with the help of the adjusting bolt 718 and the buffer spring 719. By adjusting the rotation amount of the adjusting bolt 718, the distance between the stepped through hole 717 and the adjusting bolt 718 can be changed, and then the buffer spring 719 will push the groove-shaped pressure plate 715 outward; when the replaceable grinding head 714 and the groove-shaped pressure plate 715 extrude the material, the buffer spring 719 will be compressed under stress, allowing the groove-shaped pressure plate 715 to retreat inward. The flexible extrusion mode realized by the buffer spring 719 has a significant advantage when processing high-hardness and high-brittle silicon carbide blocks. The flexible extrusion mode realized by the buffer spring 719 can buffer the material instead of rigid impact, which effectively reduces excessive crushing caused by material brittleness, greatly improves the yield, and obtains high-quality aggregate with better particle shape and fewer internal micro-cracks, while significantly reducing the generation rate of useless stone powder; considering the extremely high abrasiveness of silicon carbide, the design of the replaceable grinding head 714 greatly reduces the operation and maintenance cost and downtime, solves the problem of fast roller surface wear of traditional crushing equipment, and ensures efficient, low-consumption and long-life operation while continuously and stably producing high-quality silicon carbide aggregate.

[0070] The control crusher crushing ratio is always maintained in the golden interval of 2.5:1 to 4:1, to efficiently process high-hardness brittle materials and inhibit excessive crushing. When the visual system at the front end of the device detects small blocks with a side length of 20mm to 40mm, the PLC controller will immediately instruct the displacement actuator to narrow the crushing roller spacing to 10mm; as the incoming material size increases, the spacing is also correspondingly and nonlinearly widened: for medium-sized materials with a side length of 41mm to 80mm, the spacing will be automatically adjusted to 20mm; when detecting that the incoming material size enters the large material range of 81mm to 120mm, the spacing will be set to 35mm; and for super large blocks of 121mm to 160mm, the system will open the spacing to 50mm, so that the crusher can adapt to the changes in the incoming material flow in real time, thereby ensuring the best crushing efficiency and maintaining the product particle size.

[0071] In addition, the terms "first", "second", etc. are used herein only to describe different instances, and do not imply or suggest relative importance or a number of the technical features indicated. Thus, the features defined with "first", "second", etc. can include one or more of the features explicitly or implicitly. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0072] In the present application, unless otherwise explicitly and specifically defined, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0073] In the present application, unless otherwise explicitly and specifically defined, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0074] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or features of different embodiments or examples described in the present application without contradiction.

[0075] Although the present application is specifically shown and described in connection with preferred embodiments, those skilled in the art should understand that various changes in form and details can be made to the present application without departing from the spirit and scope of the present application defined by the appended claims, and all such changes are within the protection scope of the present application.

Claims

1. A prefabrication process for thermal insulation modules, characterized in that, Includes the following steps: S1. Pre-fabricated insulation layer: made by impregnating inorganic fiber felt with aerogel liquid, and then carrying out supercritical reaction and drying in a high temperature and high pressure container; S2. Prefabricated moisture-proof layer: Made by impregnating inorganic fiber cloth with Teflon, reacting in a reactor, shaping multiple times, and drying. S3. Sew the outer sides of the insulation layer and the moisture-proof layer together with the fabric. S4. Prefabricated protective layer: Stainless steel is laser-cut into blanks, rolled and bent, and then the insulation layer and moisture-proof layer are placed inside the stainless steel, and then electric welding is used to assemble the insulation module.

2. The prefabrication process for a thermal insulation module according to claim 1, characterized in that: In S1, the aerogel solution is prepared by using a two-step acid-base catalytic method to precisely control the molar ratio of silicon source precursor and hydrophobic agent within the range of 1.2 to 1.

5. After gelation, 5% to 10% by mass of inorganic high-temperature ceramic adhesive precursor and 15% to 25% by mass of hollow microspheres are introduced and mixed. The atmospheric pressure drying path is optimized by solvent exchange and multiple surface modifications to suppress pore collapse caused by capillary forces. A two-stage thermosetting process is adopted: low-temperature curing stabilizes the hydrophobic groups, and high-temperature sintering activates the ceramic adhesive to form a high-strength inorganic framework.

3. The prefabrication process for a thermal insulation module according to claim 2, characterized in that: In S2, the aerogel solution is prepared by pouring an aqueous PTFE dispersion into an impregnation tank, passing a high-strength fiberglass cloth through the tank, maintaining the impregnation solution temperature at 20℃~25℃, drying the impregnated fabric at 90℃~100℃ until the weight is constant, removing moisture, baking at 230℃~250℃ to remove the nonionic surfactant used in the dispersion, and sintering at 380℃~400℃ to melt the PTFE particles and form a continuous film. The holding time for this step is 2~5 minutes per layer to achieve mechanical anchoring bonding between PTFE and the substrate. The cycle of impregnation, drying, baking, and sintering is repeated according to the required PTFE content and thickness.

4. The prefabrication process for a thermal insulation module according to claim 1 or 3, characterized in that: In s4, the stainless steel plate is first rolled and bent into a left half-sheath (1) that can surround the insulation layer and the moisture-proof layer, and a right half-sheath (2) that surrounds the insulation layer and the moisture-proof layer. The bottom of the left half-sheath (1) and the right half-sheath (2) is provided with a horizontal groove (3) for surrounding the horizontal side pipe of the external tee pipe. The top of the left half-sheath (1) and the right half-sheath (2) is provided with a vertical groove (4) for surrounding the top of the external tee pipe. The left half-sheath (1) is provided with a lower extension piece (101) on the upper and lower sides of the horizontal groove (3). The left half-sheath (1) is provided with an upper extension piece (102) on the front and rear sides of the vertical groove (4). Then, hook blocks (5) are welded on the upper extension piece (102) and the lower extension piece (101). A buckle mechanism (6) that engages with the hook block (5) is welded on the right half-sheath (2).

5. The prefabrication process for a thermal insulation module according to claim 3, characterized in that: In step S1, during the mixing stage of the aerogel solution, 5% to 15% by mass of silicon carbide micropowder is further introduced as a thermal radiation shielding agent, and a high-shear process is used to uniformly disperse it in the solution.

6. The prefabrication process for a thermal insulation module according to claim 5, characterized in that: The average particle size of the silicon carbide micro powder is 1 to 10 micrometers.

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