Film structure for granary

Abstract

The utility model relates to the technical field of thin film structures, and discloses a thin film structure for a granary, which comprises a thin film main body, the thin film main body comprises a first connecting part, a second connecting part and a redundant part, the first connecting part and the second connecting part are respectively connected and fixed with a granary wall and a granary ground, the redundant part is arranged at the position, close to the connecting position of the granary ground and the granary wall, of the first connecting part and the second connecting part, and the redundant part can stretch when the connecting position of the granary ground and the granary wall deforms or cracks. According to the utility model, a section of redundant part is introduced into the film structure at the joint of the wall surface and the ground, and when the granary deforms, the redundant part can extend to adapt to the deformation of the granary building structure, so that the problem that the film is easy to damage in the prior art is solved, the overall performance of the connection of the film structure is obviously improved, and the air tightness of the granary is effectively ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to a film structure technical field especially relates to a film structure for granary. BACKGROUND

[0002] When carrying out air conditioning, fumigation and transverse ventilation and other technologies in the granary, the air tightness of the granary needs to be ensured, and in the prior art, a high molecular film (such as HDPE, PVC, etc.) is usually directly attached to the ground and the wall surface to form a continuous sealing layer to isolate external moisture and ensure that the grain storage environment is dry. However, the existing film laying method is mostly full adhesion fixation, that is, the film is completely adhered to the surface of the building base by an adhesive, so that the film and the building base form a rigid connection. Although this rigid connection method ensures the sealing property of the film to a certain extent, it also brings the following significant problems during use:

[0003] When the granary is loaded with grain, the building structure is prone to deformation (such as foundation settlement or wall cracking, which is common during the use of the granary) due to bearing pressure, and these deformations will cause the film to be subjected to stress concentration. Since the film and the building base form a rigid connection and lack a deformation buffer space, the film is prone to tearing or debonding at the stress concentration site, thereby damaging the sealing layer and causing the sealing system to fail. In particular, in the southern region, due to the humid climate, the air tightness requirement of the granary is more urgent, and the damage of the film will accelerate the moisture absorption and mold of the grain, seriously affecting the quality of grain storage.

[0004] In view of the above problems, the traditional improvement methods mainly include increasing the thickness of the film, laying a buffer pad in layers, and using a partition isolation scheme, etc. However, simply increasing the thickness of the film will reduce the construction efficiency, increase the material cost, and have limited adaptability to complex deformations. Although laying a buffer pad in layers can alleviate stress concentration to a certain extent, it will weaken the overall sealing property and increase the risk of leakage. The partition isolation scheme is also difficult to handle the joints, which is prone to leakage at the joints and difficult to ensure the sealing continuity between the regions.

[0005] In the prior art, although the importance of the film laying method to the performance of the air tightness system has been realized, the above improvement schemes cannot effectively adapt to dynamic deformation while maintaining the air tightness performance, resulting in premature failure of the air tightness system under periodic load. UTILITY MODEL CONTENTS

[0006] The utility model aims at solving the problems in the prior art and provides a film structure for a granary.

[0007] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0008] The utility model provides a film structure for granary, including film main part, first connecting site, second connecting site and redundancy site, first connecting site, second connecting site are connected and fixed with granary wall, granary ground respectively, redundancy site sets up at the position of first connecting site, second connecting site near the connecting place of granary ground and granary wall, redundancy site can stretch when the connecting place of granary ground and granary wall deforms or cracks.

[0009] Preferably, the redundancy site adopts periodic geometry of corrugated fold or serpentine fold structure.

[0010] Preferably, the redundancy site adopts arc structure of preset curvature, and a deformable body is arranged in an arc-shaped groove on one side of the redundancy site near the connecting place of the granary ground and the granary wall.

[0011] Preferably, the redundancy site can adapt to a working condition deformation of at least a 2 cm wide crack.

[0012] Preferably, the film main body is provided in multiple pieces, and an overlap portion is arranged at the connecting place of two adjacent first connecting sites or two connected second connecting sites, and the overlap portion has a value of 5 cm to 12 cm along the width direction of the film main body.

[0013] Preferably, the redundancy site is detachably connected between the first connecting site and the second connecting site.

[0014] Preferably, the redundancy site includes a plurality of sequentially connected primary fold units, and the plurality of primary fold units are arranged in a wave shape.

[0015] Preferably, a plurality of secondary fold units are arranged on the outer side of the wave-shaped structure of the primary fold unit, and the corrugated direction of the secondary fold units is orthogonal to the primary fold unit.

[0016] Preferably, the opposite ends of the redundancy site are respectively sealed and connected to the first connecting site and the second connecting site through detachable sealing strips.

[0017] Preferably, at least one end of the detachable sealing strip is in the form of a dovetail groove, and a connecting spike is arranged at the connecting place of the dovetail groove.

[0018] Compared with the prior art, the utility model has the beneficial effects that:

[0019] (1) The film structure for granary introduces a redundancy site in the film structure at the connecting place of the wall surface and the ground, so that the site can have ordered extension deformation in the dynamic deformation process of the building structure caused by the ground subsidence, the wall micro-cracking or deflection and other dynamic deformation processes caused by the loading of grain, and the structure is simple, easy to maintain and reliable in use.

[0020] (2) The membrane structure of the grain silo described in this application has redundant parts connected to non-redundant parts by detachable sealing strips. When a part is damaged, only a single module needs to be replaced without damaging the overall sealing layer, which effectively reduces on-site installation time and maintenance costs. It is especially suitable for small and medium-sized grain silos with frequent turnover. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the first redundant structure in the film structure for grain storage described in this embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the first redundant structure in the film structure for grain storage described in this embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the third redundant structure in the film structure for grain storage described in this embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the overlapping and laying structure of the film structure for grain storage as described in an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram showing the distribution of the secondary pleated units of the film structure used for grain storage as described in an embodiment of this utility model;

[0026] Figure 6 This is a schematic diagram showing the location of the spiderweb-type support system for redundant structures in the membrane structure used for grain storage according to an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the main body composition of the film structure used in the grain silo according to an embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram showing the connection between non-redundant parts in the membrane structure for grain storage described in this embodiment of the invention.

[0029] In the diagram: 1. Film body; 2. High-density polyethylene fiber layer; 3. Elastic TPU buffer layer; 4. Anti-mildew coating; 5. First connection part; 6. Redundant part; 7. Primary pleated unit; 8. Secondary pleated unit; 9. Spider web-type support system; 10. Main skeleton wire; 11. Removable sealing strip; 12. Connecting spikes; 13. Second connection part; 14. Grain silo floor; 15. Grain silo wall; 16. Deformable body; 17. Overlapping part. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0031] Reference Figure 1 As shown, this application discloses a membrane structure for a grain silo, including a membrane body 1. The membrane body 1 includes a first connecting portion 5, a second connecting portion 13, and a redundant portion 6. The first connecting portion 5 is fixedly connected to the grain silo wall 15, and the second connecting portion 13 is fixedly connected to the grain silo floor 14. The redundant portion 6 is disposed near the connection between the first connecting portion 5 and the second connecting portion 13 and the connection between the grain silo floor 14 and the grain silo wall 15. The redundant portion 6 can extend when the connection between the grain silo floor 14 and the grain silo wall 15 deforms or cracks.

[0032] The membrane structure of the grain silo described in this application adds a retractable corrugated or pleated redundant portion 6 at the wall-to-floor connection point through an integral molding process or a detachable connection process. This solves the tearing or detachment problem caused by rigid, fully bonded membrane connections in the prior art. The membrane body 1 is fixedly connected to the grain silo floor 14 and the grain silo wall 15 by hot melting or adhesive bonding to form the first and second connection points, ensuring good sealing. At the junction of the two, a pre-formed multi-period corrugated or pleated structure is provided as a redundant portion 6. Due to its geometric shape and material elasticity, it can reversibly expand and contract during slight deformation, absorbing and dispersing stress, and achieving adaptive adjustment to dynamic deformations such as wall settlement, cracking, or deflection, avoiding local stress concentration that could damage the sealing layer.

[0033] The membrane structure of the grain silo described in this application introduces a redundant section 6 located at the connection between the wall and the ground in the traditional membrane structure. This section can undergo orderly extension deformation during the dynamic deformation of the building structure caused by foundation settlement, wall micro-cracking or deflection due to grain loading, so as to disperse and absorb concentrated stress. The structure is simple, easy to maintain and reliable in use.

[0034] As a preferred example of this application, the redundant portion 6 adopts a periodic geometric shape with corrugated folds or serpentine folds. For example... Figure 1 , Figure 2 As shown, the redundant part 6 can adopt a corrugated or serpentine fold structure arranged periodically in the horizontal or vertical direction. The redundant part 6 can be further extended and unfolded when the base layer moves slightly due to its periodic geometric shape and constitutive elasticity, so as to fully absorb and disperse local stress and avoid the film tearing and debonding of the first connection part 5 and the second connection part 13.

[0035] As a preferred example of this application, the redundant part 6 adopts an arc-shaped structure with a preset curvature, and a deformable body 16 is provided in the arc-shaped groove on the side of the redundant part 6 near the connection between the grain silo floor 14 and the grain silo wall 15. Figure 3 As shown, this design discloses a novel redundant structure. The redundant portion 6 employs an arc-shaped structure with a preset curvature, and a deformable body 16 is pre-embedded on one side of the groove within this arc-shaped structure to form a dynamic support unit. The deformable body 16 closely matches the groove wall to support the redundant portion 6. Under external force, the radius of curvature of the redundant portion 6 is changed through a pivot displacement to achieve dynamic buffering, thereby absorbing and dispersing stress concentration and preventing tearing or debonding of the membrane at the first connection portion 5 and the second connection portion 13. This structure requires no additional supports or fillers, is easy to construct, and allows for optimization of the groove curvature and the material ratio of the deformable body 16 through finite element simulation. Parameters can be customized for different chamber sizes, balancing sealing and buffering performance. This achieves a membrane structure with a stable sealing function in a static state and efficient buffering capability in a dynamic state.

[0036] As a preferred example of this application, the redundant portion 6 can adapt to deformation under working conditions with cracks at least 2 cm wide. In the example of this application, the adhesion height of the first connecting portion 5 on the grain silo wall 15 is L1, the adhesion height of the second connecting portion 13 on the grain silo floor 14 is L2, and the unfolded length of the redundant portion 6 in the vertical section is L, where 5% ≤ L / (L1+L2) ≤ 30%. As a specific example of this application, L1 is 30 cm, L2 is 20 cm, and L is 7.5 cm. In the example of this application, if L / (L1+L2) < 5%, the redundancy effect is not achieved, and it cannot adapt to working conditions with cracks wider than 2 cm. If L / (L1+L2) > 30%, it is easy to cause cost waste and make it difficult to overlap the two films. This setting, by optimizing the deformation redundancy size of the redundant portion 6, can achieve sufficient redundancy energy absorption with a small amount of material, realizing the best balance between the sealing performance of the film structure in the static state and the buffering performance in the dynamic state, ensuring the long-term stable airtightness of the grain silo.

[0037] As a preferred example of this application, such as Figure 4As shown, the film body 1 is provided with multiple sheets. An overlap portion 17 is provided at the connection point of two adjacent first connecting parts 5 or two connected second connecting parts 13. The overlap portion 17 is 5cm to 12cm in width along the width direction of the film body 1. Based on the use of multiple independent sheets spliced ​​together, this application reserves an overlap portion 17 with a width of 5cm to 12cm at the connection point of two adjacent film sheets. The overlap portion 17 is fixed to the upper and lower film sheets by hot-melt welding or polymer adhesive to form a clamping structure. Its position is located between two adjacent first connecting parts 5 or between two adjacent second connecting parts 13, close to the wall or ground connection area. This arrangement not only enhances the sealing continuity between the sheets but also takes into account construction convenience, avoiding the construction difficulty and material waste caused by excessively wide overlaps.

[0038] In this embodiment, as Figure 7 As shown, the film body 1 includes a high-density polyethylene fiber layer 2, an elastic TPU buffer layer 3, and an anti-mildew coating 4 arranged sequentially from the outside to the inside. The outer layer is made of UV-resistant high-density polyethylene (HDPE) film with a thickness of 0.5-1.0 mm, which is co-extruded by an extruder. The middle layer is a thermoplastic polyurethane (TPU) elastic buffer layer with a thickness of 0.3-0.5 mm, which is bonded to the HDPE layer by a hot-pressing process to ensure extensibility. The inner layer is coated with an anti-mildew nano-coating (silver ion antibacterial agent is used in this embodiment), which is sprayed onto the surface of the TPU layer with a thickness of ≤0.05 mm. This application employs a three-layer composite film structure. The outer high-density polyethylene fiber layer provides a robust moisture-proof and UV-resistant barrier, the middle TPU buffer layer absorbs and disperses stress when the substrate experiences slight movement or vibration, and the inner silver ion nano-coating releases antibacterial components to inhibit mold growth when trace amounts of moisture intrude. This ensures the airtightness of the grain silo while achieving synergistic protection functions of overall moisture-proof, UV-proof, and mold-proof. As a result, the main structure of the film 1 possesses high strength, excellent ductility, and continuous mold-proof performance, while also improving the convenience of construction and reducing maintenance frequency and project costs.

[0039] As a preferred example of this application, the redundant part 6 is detachably connected between the first connecting part 5 and the second connecting part 13. In this example, the first connecting part 5 and the second connecting part 13 constitute the non-redundant part of the membrane body 1. They are firmly fixed to the grain silo wall 15 and the grain silo floor 14 by hot-melt welding or ultrasonic welding combined with polymer adhesive or mechanical buckles to ensure basic sealing performance. The redundant part 6 is connected to the non-redundant part by a detachable bayonet, pin or snap structure. When the base layer settles, cracks or needs maintenance, the part can be quickly disassembled and replaced manually or with simple tools. After disassembly, the original non-redundant part continues to maintain the basic fixing function of the membrane body 1. After the new redundant part 6 is installed, the consistency of the overall connection can be restored, ensuring the airtightness of the grain silo. This setting maintains the convenience of modular maintenance and avoids a significant increase in construction difficulty and cost when replacing the whole structure.

[0040] As a preferred example of this application, the redundant portion 6 includes a wave-shaped primary pleated unit 7. The primary pleated unit 7 provides longitudinal redundant expansion space to buffer the film stretching caused by grain silo deformation (such as foundation settlement) and prevent stress concentration tearing. In the example of this application, a wave-shaped primary pleated unit 7 is formed in one piece using a hot press mold at the corner of the wall and the ground as the redundant portion 6. The periodic wavelength of this wave structure is controlled between 30 and 80 mm, and the pleat amplitude is controlled between 15 and 25 mm. Through this geometric structure, longitudinal expandable space is reserved in the corner area where the film body 1 connects to the base layer. When the grain silo is loaded or unloaded or the environmental temperature and humidity change, causing foundation settlement or slight wall movement, the primary pleated unit 7 first undergoes reversible tensile deformation to absorb and disperse stress, avoiding local tearing or debonding of the film body 1 and the connection part.

[0041] As a preferred example of this application, such as Figure 5As shown, a secondary folding unit 8 is provided on the outer, tidal-facing surface of the waveform structure of the primary folding unit 7. In this embodiment, the secondary folding unit 8 is vertically pressed on the outer, tidal-facing surface of the primary folding unit 7. The corrugation direction of the secondary folding unit 8 is orthogonal to that of the primary folding unit 7, thereby adding a transverse multiple buffer unit on the basis of the original longitudinal buffer space. The secondary folding unit 8 not only disperses the pressure applied from the grain side and improves the local pressure resistance, but also forms a directional water channel structure on the film surface, allowing condensate to quickly collect along the bottom of the folds and be smoothly discharged, avoiding the accumulation of water vapor at the contact surface between the film and the grain, which could cause mold or leakage. Furthermore, the secondary folding unit 8 is formed in one piece by hot pressing, which is simple in process. The folding parameters can be customized according to the structure of the storage unit and the pressure on the grain stacking side, so as to achieve efficient coordination between production and construction. In the example of this application, the wavelength of the secondary pleated unit 8 is 20-30 mm and the amplitude is 5-10 mm. Under the premise of ensuring effective dispersion of lateral pressure and providing sufficient flow channels, it has good manufacturing process adaptability. This range can not only obtain a stable geometry during hot pressing, but also form a reasonable multi-level buffer structure with the wavelength and amplitude of the primary pleated unit 7.

[0042] In this embodiment, a spider web-type support system 9 is also included, which is disposed on the inner bearing surface of the waveform structure of the first-level folded unit 7, and its position corresponds to the position of the second-level folded unit 8.

[0043] In this embodiment, based on the aforementioned multi-level pleated buffer structure, a spider web-type support system 9 is added to the inner bearing surface of the first-level pleated unit 7. The spider web-type support system 9 includes:

[0044] The skeleton main wire 10 is made of 316L stainless steel wire with a diameter of 0.3mm and woven into a diamond-shaped mesh structure (mesh size 10mm×10mm). It covers the inner bearing surface of the first-level pleated unit 7. The stress is dispersed by the diamond mesh skeleton, and the spiral auxiliary wire provides bidirectional tensile strength to prevent the pleats from being over-unfolded and causing the seal to fail.

[0045] The spiral auxiliary filament uses high-density polyethylene (HDPE) fiber with a diameter of 0.1 mm, which is wound around the skeleton main filament 10 at a spiral angle of ±45° to form a bidirectional reinforcement structure. Its material is the same as that of the film body 1, which has better heat melt compatibility and excellent resistance to damp heat.

[0046] In the example of this application, by introducing a spider web-type support system 9, the spider web-type support system 9 is laid flat inside the first-level pleated unit 7, and locally heated to the melting point of HDPE (130-140℃) by a hot air gun, so that it melts and bonds with the TPU layer, so that the film structure can achieve multi-level stress dispersion and bi-directional tensile support when subjected to grain lateral pressure or base deformation.

[0047] In this embodiment, the film body 1 is installed in the following manner:

[0048] The non-redundant areas (flat areas) are fully bonded to the grain silo walls 15 and the grain silo floor 14 using epoxy adhesive. The prefabricated redundant area modules 6 (e.g., 1m x 1m in size) are then snapped into place with the non-redundant areas using removable sealing strips 11 (TPU material, dovetail groove structure) on both sides. Figure 8 As shown, at least one end of the cross-section of the detachable sealing strip 11 is a dovetail groove, and the detachable sealing strip 11 is mechanically anchored at the connection of the dovetail groove by connecting spikes 12.

[0049] The membrane structure for grain silos disclosed in this application effectively solves the problem of membrane susceptibility to damage in the prior art by introducing an innovative redundant part design, and significantly improves the adaptability and durability of the membrane structure in ensuring the airtightness of the grain silo.

[0050] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A membrane structure for grain silos, characterized in that: The film body (1) includes a first connecting part (5), a second connecting part (13) and a redundant part (6). The first connecting part (5) and the second connecting part (13) are respectively connected and fixed to the grain warehouse wall (15) and the grain warehouse floor (14). The redundant part (6) is located near the connection between the grain warehouse floor (14) and the grain warehouse wall (15) of the first connecting part (5) and the second connecting part (13). The redundant part (6) can extend when the connection between the grain warehouse floor (14) and the grain warehouse wall (15) deforms or cracks.

2. The membrane structure for grain silos according to claim 1, characterized in that: The redundant part (6) adopts a periodic geometric shape with corrugated or serpentine folds.

3. A membrane structure for grain silos according to claim 1, characterized in that: The redundant part (6) adopts an arc-shaped structure with a preset curvature, and a deformable body (16) is provided in the arc-shaped groove on the side of the redundant part (6) near the connection between the grain warehouse floor (14) and the grain warehouse wall (15).

4. A membrane structure for grain silos according to claim 1, characterized in that: The redundant part (6) can adapt to working conditions with cracks at least 2 cm wide.

5. A membrane structure for grain silos according to claim 1, characterized in that: The film body (1) is provided with multiple sheets, and an overlap (17) is provided at the connection point of two adjacent first connection parts (5) or two connected second connection parts (13). The overlap (17) is 5cm to 12cm along the width direction of the film body (1).

6. A membrane structure for grain silos according to claim 1, characterized in that: The redundant part (6) is detachably connected between the first connecting part (5) and the second connecting part (13).

7. A membrane structure for grain silos according to claim 6, characterized in that: The redundant part (6) includes several first-level fold units (7) connected in sequence, and the several first-level fold units (7) are arranged in a wave shape.

8. A membrane structure for grain silos according to claim 7, characterized in that: The outer side of the waveform structure of the primary fold unit (7) is provided with several secondary fold units (8), and the ripple direction of the secondary fold units (8) is orthogonal to that of the primary fold unit (7).

9. A membrane structure for grain silos according to claim 6, characterized in that: The two ends of the redundant part (6) are respectively sealed to the first connecting part (5) and the second connecting part (13) by a detachable sealing strip (11).

10. A membrane structure for grain silos according to claim 9, characterized in that: At least one end of the cross section of the detachable sealing strip (11) is a dovetail groove, and the detachable sealing strip (11) is provided with connecting spikes (12) at the connection of the dovetail groove.

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