Assembled anti-loose mobile PC mobile house

Abstract

The application discloses a mobile PC mobile house capable of being assembled and preventing loosening, and relates to the technical field of mobile houses.The mobile house comprises an assembled house, a threshold is fixedly installed on the surface of the assembled house, a connecting box is fixedly connected to the surface of the assembled house, an auxiliary assembly for facilitating disassembly and assembly is arranged in the connecting box, an anti-loosening assembly for preventing loosening of bolts is arranged in the connecting box, a through hole is formed in the inner wall of the connecting box, and a fixing column is fixedly connected to the outer side of the connecting box.Through bolt connection of the auxiliary assembly, the mobile house can be conveniently disassembled and assembled, and is convenient to transform and reuse.The bolt connection is compared with welding and other modes, destructive operation is not needed during disassembly, material loss is reduced, the mobile house can be repeatedly used, the comprehensive use cost is reduced, the PC material can withstand long-term use and frequent disassembly and assembly requirements, the PC material is not prone to damage, and can be recycled and reused.

Description

Technical Field

[0001] This invention relates to the field of prefabricated housing technology, specifically to a mobile prefabricated PC house that can be assembled and prevented from loosening. Background Technology

[0002] Prefabricated houses are temporary buildings that are widely used in field construction, temporary offices, disaster relief, exhibitions and other fields due to their advantages such as speed, convenience and economy. The types of prefabricated houses are constantly being enriched, including ordinary steel structure houses, composite houses, and prefabricated concrete houses, to meet the needs of customers with different requirements.

[0003] Most existing prefabricated houses are steel-wood structures, which have advantages such as easy transportation, convenient relocation, and attractive appearance, but also have some disadvantages:

[0004] Poor sound insulation and heat preservation performance: Prefabricated houses generally use lightweight steel and sandwich panels as structural materials, which have poor sound insulation and heat preservation performance, making them unsuitable for occasions with high sound insulation and heat preservation requirements.

[0005] Low recycling rate: The design and manufacturing of existing prefabricated houses do not take recycling into account. For example, the use of materials that are difficult to separate and excessive welding or bonding methods makes recycling difficult and increases costs. As a result, the houses cannot be reused after use, resulting in a low recycling rate. Some prefabricated houses are made of low-quality materials that cannot withstand long-term use and frequent disassembly and assembly, leading to damage and making them impossible to recycle and reuse effectively. Moreover, the maintenance cost of prefabricated houses is relatively high. Once building materials need to be replaced, the cost is expensive, and effective maintenance and repair cannot be carried out, thus making recycling and reuse impossible.

[0006] Easy to loosen: Existing prefabricated houses do not take measures to prevent loosening of the connectors during the assembly process. During use, the prefabricated houses are affected by external vibrations or shocks, such as the operation of mechanical equipment and collisions with people, which can cause the connectors to loosen or come off. Loose prefabricated houses will lead to a decrease in their airtightness, resulting in air leaks and water leaks, affecting the indoor environment and the use effect, and also increasing the risk of collapse, posing safety hazards to users.

[0007] Therefore, this invention proposes an assemblable and anti-loosening mobile PC prefabricated house to improve the shortcomings of traditional technology and realize an assemblable, recyclable and anti-loosening PC prefabricated house. Summary of the Invention

[0008] To address the problems of high initial material costs, low recycling rates, and easy loosening in existing prefabricated houses, this invention proposes an assemblable and anti-loosening mobile PC prefabricated house. This PC prefabricated house utilizes precast concrete construction, achieving standardization. It employs prefabricated PC modules, and PC material possesses excellent lightweight and high strength characteristics. PC material has a relatively low density, making it lightweight while maintaining high strength, excellent impact resistance, and durability. This makes the prefabricated house more convenient and robust during movement and use. The PC prefabricated house utilizes a modular concept, resulting in a simple and elegant layout. It achieves standardized design, industrialized production, and modular assembly, thereby achieving green environmental protection and reducing labor costs. This invention enables assemblable, recyclable, and anti-loosening PC prefabricated houses, solving the problems mentioned in the background technology.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a mobile prefabricated PC structure that is assemblable and resistant to loosening, which is assemblable, recyclable, and resistant to loosening. The mobile prefabricated PC structure includes an assembly panel, a threshold fixedly installed on the surface of the assembly panel, a connecting box fixedly connected to the surface of the assembly panel, auxiliary components for easy disassembly and assembly provided inside the connecting box, anti-loosening components for preventing bolts from loosening inside the connecting box, through holes opened in the inner wall of the connecting box, and a fixing column fixedly connected to the outer side of the connecting box.

[0010] Preferably, the prefabricated house consists of a base plate, wall panels, roof panels, or floor slabs.

[0011] Preferably, the auxiliary component includes a stud that penetrates the connecting box, with both ends of the stud located in two connecting boxes respectively. A first damping pad is movably connected to the outer surface of the stud, and a second damping pad is movably connected to the outer surface of the stud. A nut is threadedly connected to the end of the stud away from the first damping pad. A protrusion is fixedly connected to the inner wall of the connecting box. A groove is formed on the outer side of the protrusion. A first spring plate and a second spring plate are movably connected inside the groove. A movable cover is slidably connected to the side of the protrusion near the nut. A cylinder is fixedly connected to the inner wall of the protrusion.

[0012] Preferably, the anti-loosening component includes a groove formed in the inner wall of the connecting box, a sliding plate slidably connected inside the groove, a round hole and a square hole formed in the sliding plate, a square column fixedly connected to the inner wall of the connecting box, a rotating block rotatably connected to the top of the square column, a torsion spring fixedly connected to the bottom of the sliding plate, and the end of the torsion spring away from the sliding plate being fixedly connected to the inner wall of the connecting box.

[0013] Preferably, the first shock-absorbing pad is located between the end of the stud away from the nut and the inner wall of the connecting box, and the second shock-absorbing pad is located between the two connecting boxes.

[0014] Preferably, the first spring sheet and the second spring sheet are placed symmetrically to each other.

[0015] Preferably, the surfaces of the first and second spring sheets are provided with circular grooves, and the cylinder is located in the circular grooves.

[0016] Preferably, the size of the rotating block is adapted to the size of the square hole.

[0017] Preferably, the size of the circular hole is adapted to the size of the end of the stud near the slide plate.

[0018] Preferably, the interior of the prefabricated house is equipped with glass wool and heat insulation film.

[0019] The mobile prefabricated PC house that can be assembled and prevented from loosening, provided by the present invention, has the following beneficial effects:

[0020] 1. This invention uses concrete components for prefabrication and assembly of prefabricated modular houses. It is designed using a modular concept to form small units. The prefabricated houses made of PC material have the advantages of high durability, stable structure, lightweight and high strength, convenient construction and environmental protection and energy saving. Its advantages are that it provides reliable performance and a short construction cycle, and is suitable for various temporary buildings and engineering projects. Most importantly, it is more comfortable than traditional prefabricated houses. The glass wool and heat insulation film installed inside the prefabricated house can effectively reduce noise transmission and achieve heat preservation, making it suitable for occasions with high sound insulation and heat preservation requirements.

[0021] 2. This invention adopts prefabrication technology, which can be used to assemble components on site after prefabrication according to actual conditions and needs, or to assemble them into finished prefabricated houses and transport them directly to the site. It can be delivered as a bare shell or after fine decoration. Multi-layer assembly can be carried out according to actual needs, and the design is flexible and diverse.

[0022] 3. This invention uses precast concrete components, manufactured in a factory with high precision and controllable quality. The concrete is highly durable. Connectors are pre-embedded in the components, and the connectors are pre-installed on the panels during manufacturing, reducing on-site construction work, significantly shortening the construction cycle, and improving construction efficiency. By using bolt connections in auxiliary components, disassembly and assembly can be easily carried out, making the prefabricated house more flexible, easy to relocate, modify, and reuse. Compared with welding and other methods, bolt connections do not require destructive operations during disassembly, reducing material waste and enabling the prefabricated house to be reusable and reduce its overall cost. The PC material used can withstand long-term use and frequent disassembly and assembly, making it less prone to damage and recyclable.

[0023] 4. Bolts serve as connecting components in the model house. By using anti-loosening components, bolts can be prevented from loosening or nuts from falling off, ensuring the reliability and stability of the connections. Using anti-loosening measures can prevent bolts from loosening or falling off due to external vibrations, improving the safety of the model house and reducing the frequency and cost of maintenance. This can improve the overall quality and reliability of the model house and ensure the stability and safety of the building. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a rear view of the overall structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the internal structure of the connector box of the present invention;

[0027] Figure 4 This is a side view of the overall structure of the present invention;

[0028] Figure 5 for Figure 4 Enlarged structural diagram at point A in the middle;

[0029] Figure 6 This is a cross-sectional view of the auxiliary component structure of the present invention;

[0030] Figure 7 for Figure 6 Enlarged structural diagram at point B;

[0031] Figure 8 This is a schematic diagram of the anti-loosening component structure of the present invention;

[0032] Figure 9 This is a schematic diagram of the connecting box structure of the present invention;

[0033] Figure 10This is a schematic diagram of the spring sheet structure of the present invention.

[0034] The labels in the diagram represent:

[0035] 1. Prefabricated house; 2. Threshold; 3. Connecting box;

[0036] 4. Auxiliary components; 41. Stud; 42. First shock-absorbing pad; 43. Second shock-absorbing pad; 44. Protrusion; 45. Groove; 46. First spring plate; 47. Second spring plate; 48. Movable cover; 49. Cylinder; 410. Nut;

[0037] 5. Anti-loosening component; 51. Slide groove; 52. Slide plate; 53. Round hole; 54. Square hole; 55. Square column; 56. Rotating block; 57. Torsion spring;

[0038] 6. Through hole; 7. Fixing post. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0040] refer to Figures 1 to 9As shown, a preferred embodiment of the present invention, a mobile prefabricated PC house with assembleability and anti-loosening features, will be described in detail below. This mobile prefabricated PC house, designed to be assemblable, recyclable, and anti-loosening, includes an assembly panel 1. A threshold 2 is fixedly installed on the surface of the assembly panel 1. The threshold 2 fills the gap between the door and the ground, effectively preventing cold or hot air from entering the room from the outside, while also preventing indoor air from escaping, achieving a sealing and insulation effect. The threshold 2 prevents rainwater or moisture from seeping into the room from the bottom of the door, providing waterproofing and moisture-proofing. It is particularly suitable for doors installed in low-lying or easily flooded areas. As a buffer layer between the door and the ground, the threshold 2 reduces the transmission of external noise, providing a quieter indoor environment and is an indispensable component in door and window decoration. A connecting box 3 is fixedly connected to the surface of the assembly panel 1. The connecting box 3 contains auxiliary components 4 for easy disassembly and assembly. The prefabricated house 1 is equipped with an anti-loosening component 5 to prevent bolts from loosening. The inner wall of the connecting box 3 has a through hole 6, and the outer side of the connecting box 3 is fixedly connected with a fixing column 7. The prefabricated house 1 is composed of a base plate, wall panels, and roof or floor panels. The interior of the prefabricated house 1 is equipped with glass wool and heat insulation film. The prefabricated house 1, made of PC material, has the advantages of high durability, stable structure, lightweight and high strength, convenient construction, and environmental protection and energy saving. Compared with traditional materials, PC material has a lower density and lighter weight, but higher strength. It can reduce the weight of the prefabricated house while ensuring safety, making it easy to transport and install. Moreover, PC material is a recyclable material with lower carbon emissions and energy consumption, meeting environmental protection and energy saving requirements. Its advantages are that it provides reliable performance and a shorter construction cycle, making it suitable for various temporary buildings and engineering projects. Most importantly, it is more comfortable than traditional prefabricated houses. The glass wool and heat insulation film installed inside the prefabricated house 1 can effectively reduce noise transmission and achieve heat preservation, making it suitable for occasions with high sound insulation and heat preservation requirements.

[0041] refer to Figures 3 to 10As shown, the auxiliary component 4 includes a stud 41 that penetrates the connecting box 3, and the stud 41 penetrates the protrusion 44. Both ends of the stud 41 are located within the two connecting boxes 3 respectively. A first damping pad 42 is movably connected to the outer surface of the stud 41, and a second damping pad 43 is movably connected to the outer surface of the stud 41. A nut 410 is threadedly connected to the end of the stud 41 away from the first damping pad 42. The protrusion 44 is fixedly connected to the inner wall of the connecting box 3. A groove 45 is formed on the outer side of the protrusion 44. A first spring plate 46 and a second spring plate 47 are movably connected inside the groove 45. A movable cover 48 is slidably connected to the side of the protrusion 44 near the nut 410. A cylinder 49 is fixedly connected to the inner wall of the protrusion 44. Vibration damping pad 42 is located between the end of stud 41 furthest from nut 410 and the inner wall of connecting box 3. Second vibration damping pad 43 is located between the two connecting boxes 3. The vibration damping pads can reduce vibration and impact at the bolted connection, decrease the degree of vibration transmission to other parts of the structure, provide better vibration damping, and protect the integrity and stability of the prefabricated house structure and equipment. The vibration damping pads also have a certain sound absorption function, reducing noise transmission at the bolted connection and providing a quieter indoor or working environment. Furthermore, the vibration damping pads can adjust the balance at the bolted connection, ensuring uniform force distribution and improving the stability and reliability of the connection. First spring plate 46 and second spring plate 47 are placed symmetrically to each other. 6. A circular groove is formed on the surface of the first spring plate 46 and the second spring plate 47. The cylinder 49 is located in the circular groove. The cylinder 49 can prevent the first spring plate 46 and the second spring plate 47 from rotating in the protrusion 44. The cylinder 49 limits the first spring plate 46 and the second spring plate 47. The prefabricated house uses precast concrete components, which are produced in the factory with high precision and controllable quality. The concrete has strong durability. Connectors are pre-embedded in the components. The prefabricated house with pre-embedded connectors has the connectors pre-installed on the panels during the manufacturing process, which reduces on-site construction work, can significantly shorten the construction cycle, and improve construction efficiency. During the production process of the prefabricated house with pre-embedded connectors, the installation of the connectors is carried out by professional technicians to ensure the safety of the connectors. The installation ensures quality and stability, avoiding problems caused by improper on-site installation. The bolted connection in auxiliary component 4 allows for easy disassembly and assembly, making the model house more flexible and facilitating relocation, renovation, and reuse. Compared to welding, bolted connections do not require destructive operations during disassembly, reducing material waste and enabling the prefabricated house to be reused repeatedly, thus lowering its overall cost. The PC material used can withstand long-term use and frequent disassembly and assembly, making it less prone to damage and recyclable. Bolted connections are easy to maintain; if the connection becomes loose or damaged, it can be repaired and reinforced by simply loosening the nut 410 and replacing the bolt.

[0042] refer to Figures 3 to 9As shown, the anti-loosening component 5 includes a groove 51 formed in the inner wall of the connecting box 3. A sliding plate 52 is slidably connected inside the groove 51. The sliding plate 52 has a round hole 53 and a square hole 54. A square post 55 is fixedly connected to the inner wall of the connecting box 3. A rotating block 56 is rotatably connected to the top of the square post 55. A torsion spring 57 is fixedly connected to the bottom of the sliding plate 52. The end of the torsion spring 57 away from the sliding plate 52 is fixedly connected to the inner wall of the connecting box 3. The size of the rotating block 56 is adapted to the size of the square hole 54. The length of the rotating block 56 is greater than the width of the square hole 54. After the rotating block 56 rotates, it can... The slide plate 52 is locked in place to prevent movement. The size of the round hole 53 is matched with the size of the end of the stud 41 near the slide plate 52. The bolt plays the role of connecting components in the model house. With the cooperation of the anti-loosening component 5, the stud 41 can be prevented from loosening or the nut 410 can be prevented from falling off, ensuring the reliability and stability of the connecting parts. The use of anti-loosening measures can prevent the bolt from being loosened or falling off due to the influence of external vibration, improving the safety of the model house and reducing the frequency and cost of maintenance. This can improve the overall quality and reliability of the model house and ensure the stability and safety of the building.

[0043] The following is the complete working process and working principle of the above embodiments:

[0044] The prefabricated house 1 consists of a base slab, wall panels, and roof or floor slabs. Assembly workers connect these panels using bolts within connecting boxes 3 to assemble them into a prefabricated house. The prefabricated house uses precast concrete components with pre-embedded connecting boxes 3. During manufacturing, the connectors are pre-installed on the panels, reducing on-site construction work, significantly shortening the construction cycle, and improving efficiency. Multiple connecting boxes 3 are pre-embedded in each panel. Adjacent connecting boxes 3 are connected by studs 41. Before the studs 41 are inserted, a first damping pad 42 is fitted, and a second damping pad 43 is placed between adjacent connecting boxes 3. After the assembly worker places the second damping pad 43, the studs 41 are inserted. The protrusions 44 and... The movable cover 48 surrounds the stud 41. The assembly worker puts the nut 410 onto the stud 41. Since the nut 410 and the stud 41 are threaded, the assembly worker uses a wrench to turn the nut 410. The nut 410 rotates and moves on the stud 41. By turning the nut 410, the panels are tightly connected. By using the bolt connection in the auxiliary component 4, disassembly and assembly can be easily carried out, making the model house more flexible and easy to relocate, modify and reuse. Compared with welding and other methods, bolt connection does not require destructive operation during disassembly, reducing material loss. This allows the prefabricated house to achieve the purpose of being reusable and reducing its overall use cost. The PC material used can withstand the needs of long-term use and frequent disassembly and assembly, making it not easily damaged and recyclable.

[0045] When the nut 410 rotates and moves on the stud 41, it drives the movable cover 48 to move closer to the second damping pad 43. The movable cover 48 touches the first spring plate 46 and pushes into the groove 45. The movable cover 48 compresses the first spring plate 46, deforming it. The first spring plate 46 compresses the second spring plate 47, deforming it. After being deformed by pressure, the first spring plate 46 and the second spring plate 47 generate elastic force to push the nut 410 in the opposite direction. This makes the stud 41 and the nut 410 fit tightly, preventing the nut 410 from loosening. The assembly worker manually moves the slide plate 52. When the slide plate 52 moves, it compresses the torsion spring 57. The slide plate 52 slides in the groove 51. During the movement of the slide plate 52 towards the stud 41, the stud 41 enters the round hole 53. When the slide plate 52 moves to the nut... When the bolt 410 is tightly fitted with the nut 410 and cannot move, the rotating block 56 passes through the square hole 54. The assembly worker rotates the rotating block 56 ninety degrees. Since the length of the rotating block 56 is greater than the width of the square hole 54, the rotating block 56 locks the sliding plate 52 after rotation. The sliding plate 52 holds the nut 410 in place, preventing it from moving or loosening. The bolt in the model house plays the role of connecting components. With the cooperation of the anti-loosening component 5, the stud 41 can be prevented from loosening or the nut 410 from falling off, ensuring the reliability and stability of the connecting parts. The use of anti-loosening measures can prevent the bolt from loosening or falling off due to the influence of external vibration, improve the safety of the model house, and reduce the frequency and cost of maintenance. This can improve the overall quality and reliability of the model house and ensure the stability and safety of the building.

[0046] In summary: When assembling these panels, assembly workers use bolts in the connecting box 3 and the auxiliary component 4 for easy disassembly and assembly, making the prefabricated house more flexible and easier to relocate, modify, and reuse. Compared to welding, bolt connections do not require destructive operations during disassembly, reducing material waste and enabling the prefabricated house to be reused repeatedly, thus reducing its overall cost. The PC material used can withstand long-term use and frequent disassembly and assembly, making it less prone to damage and recyclable. When the nut 410 rotates and moves on the stud 41, it ensures a tight fit between the stud 411 and the nut 410, preventing the nut 410 from loosening. When the assembly worker manually moves the sliding plate 52, the sliding plate 52 moves... The compression torsion spring 57 and the sliding plate 52 slide within the slide groove 51. The assembly worker rotates the rotating block 56 ninety degrees. Since the length of the rotating block 56 is greater than the width of the square hole 54, the rotating block 56 locks the sliding plate 52 after rotation. The sliding plate 52 holds the nut 410 in place, preventing it from moving or loosening. The bolts in the model house serve as connecting components. With the cooperation of the anti-loosening component 5, the stud 41 can be prevented from loosening or the nut 410 from falling off, ensuring the reliability and stability of the connecting parts. Using anti-loosening measures can prevent the bolts from loosening or falling off due to external vibration, improving the safety of the model house and reducing the frequency and cost of maintenance. This can improve the overall quality and reliability of the model house and ensure the stability and safety of the building.

[0047] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An assembled anti-loose mobile PC portable house for realizing assembly, recycling and anti-loosening, characterized in that, The assembled and anti-loosening mobile PC prefabricated house includes an assembly prefabricated house (1), a threshold (2) is fixedly installed on the surface of the assembly prefabricated house (1), a connecting box (3) is fixedly connected to the surface of the assembly prefabricated house (1), an auxiliary component (4) for easy disassembly and assembly is provided inside the connecting box (3), an anti-loosening component (5) for preventing bolts from loosening is provided inside the connecting box (3), a through hole (6) is opened on the inner wall of the connecting box (3), and a fixing column (7) is fixedly connected to the outer side of the connecting box (3). The auxiliary component (4) includes a stud (41) that passes through the connecting box (3). The two ends of the stud (41) are located in the two connecting boxes (3) respectively. A first shock-absorbing pad (42) is movably connected to the outer surface of the stud (41). A second shock-absorbing pad (43) is movably connected to the outer surface of the stud (41). A nut (410) is threadedly connected to the end of the stud (41) away from the first shock-absorbing pad (42). A protrusion (44) is fixedly connected to the inner wall of the connecting box (3). A groove (45) is opened on the outer side of the protrusion (44). A first spring plate (46) and a second spring plate (47) are movably connected inside the groove (45). A movable cover (48) is slidably connected to the side of the protrusion (44) near the nut (410). A cylinder (49) is fixedly connected to the inner wall of the protrusion (44). The anti-loosening component (5) includes a groove (51) formed on the inner wall of the connecting box (3). A sliding plate (52) is slidably connected inside the groove (51). A round hole (53) is formed on the sliding plate (52). A square hole (54) is formed on the sliding plate (52). A square column (55) is fixedly connected to the inner wall of the connecting box (3). A rotating block (56) is rotatably connected to the top of the square column (55). A torsion spring (57) is fixedly connected to the bottom of the sliding plate (52). The end of the torsion spring (57) away from the sliding plate (52) is fixedly connected to the inner wall of the connecting box (3).

2. The mobile PC house of claim 1, wherein: The prefabricated house (1) consists of a base plate, wall panels, roof panels or floor slabs.

3. The mobile PC house of claim 1, wherein: The first shock-absorbing pad (42) is located between the end of the stud (41) away from the nut (410) and the inner wall of the connecting box (3), and the second shock-absorbing pad (43) is located between the two connecting boxes (3).

4. The mobile PC house of claim 1, wherein: The first spring sheet (46) and the second spring sheet (47) are placed symmetrically to each other.

5. The mobile PC house of claim 1, wherein: The first spring sheet (46) and the second spring sheet (47) have circular grooves on their surfaces, and the cylinder (49) is located in the circular grooves.

6. The mobile PC house of claim 1, wherein: The size of the rotating block (56) is adapted to the size of the square hole (54).

7. The mobile PC house of claim 1, wherein: The size of the circular hole (53) is adapted to the size of the end of the stud (41) near the slide plate (52).

8. The mobile PC house of claim 1, wherein: The interior of the prefabricated house (1) is equipped with glass wool and heat insulation film.

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