A box door structure for a grain storage refrigeration box

Abstract

The utility model discloses a kind of box door structures for grain storage refrigerators, including box door body, the edge of box door body is equipped with rubber strip groove;Compression rubber strip, compression rubber strip is set in rubber strip groove, its contact surface with refrigerator door frame is equipped with recess, recess is equipped with protruding structure;Plugboard, plugboard is set on refrigerator door frame, when box door is closed, plugboard is inserted recess and forms sealing cooperation with protruding structure.The beneficial effects of the utility model are as follows: the technical scheme is through "plugboard-recess-protruding" triple sealing structure, compared with traditional scheme, the air tightness is improved by 40%~60%, to meet the requirement of low leakage rate for nitrogen fresh-keeping.

Description

Technical Field

[0001] This utility model relates to the field of container technology, and in particular to a door structure for a grain storage refrigerated container. Background Technology

[0002] As a key piece of equipment for grain storage and transportation, the sealing performance of grain storage refrigerated boxes directly affects the freshness and storage period of grain. Current technology primarily uses traditional rubber strips for sealing grain storage refrigerated box doors, achieving a seal through pressure between the door and frame. However, this method has several significant drawbacks: Insufficient airtightness: Traditional sealing strips are often simple square-section designs, forming a single-plane contact with the door frame. Under pressure, uneven pressure distribution can easily lead to localized gaps. In nitrogen-filled grain storage scenarios, the gas leakage rate is high (typically exceeding 1.5 vol% / day), making it difficult to maintain nitrogen concentration and increasing the risk of grain oxidation and spoilage. Material safety defects: Existing sealing strips are mostly made of ordinary industrial rubber, which may contain plasticizers, heavy metals, and other harmful substances. Long-term contact with grain can easily lead to chemical migration, failing to meet safety standards for food contact materials and posing a risk of grain contamination. Poor environmental adaptability: Ordinary rubber materials are prone to hardening, cracking, or permanent deformation under extreme temperature differences (such as -30℃ low-temperature transportation or 60℃ high-temperature sterilization), leading to a significant decrease in sealing performance over time. Their service life is typically less than 3 years, resulting in high maintenance costs. Insufficient structural stability: Traditional methods of fixing rubber strips to the door rely on adhesives or mechanical clips, which are prone to detachment under the mechanical stress of frequent door opening and closing. Furthermore, the smooth inner wall of the rubber strip groove further exacerbates the risk of strip displacement, affecting sealing reliability. To address these issues, current technology lacks a sealing structure specifically designed for the characteristics of grain storage refrigerated boxes. There is an urgent need for a door sealing solution that balances high airtightness, food safety, weather resistance, and structural stability to meet the stringent environmental control requirements of grain storage. Utility Model Content

[0003] The main technical problem solved by this utility model is to provide a door structure for a grain storage refrigeration box, thereby solving one or more of the above-mentioned prior art problems.

[0004] To solve the above-mentioned technical problems, the present invention adopts a technical solution as follows: a door structure for a grain storage refrigeration box, the innovation of which lies in: including...

[0005] The door body has a rubber strip groove on its edge;

[0006] A pressure strip is provided, which is set in the groove of the strip and has a groove on the contact surface with the refrigerator door frame. The groove has a raised structure.

[0007] An insert plate is provided on the door frame of the refrigerator. When the door is closed, the insert plate is inserted into the groove and forms a sealing fit with the protruding structure.

[0008] In some implementations, the compression strip is made of a food-grade elastic material.

[0009] In some embodiments, the cross-section of the groove is an inverted trapezoid, and the protrusions are spaced apart along the length of the groove, with a protrusion height of 0.5mm-2mm.

[0010] In some embodiments, the insertion end of the insert plate is provided with a guide bevel, which forms an interference fit with the groove, and the compression is 1mm-3mm.

[0011] In some embodiments, the inner wall of the rubber strip groove is provided with anti-slip texture, and the pressure rubber strip is fixed to the rubber strip groove by a vulcanization process.

[0012] In some embodiments, the pressure strip has a Shore hardness of 60 ± 5 degrees and maintains elastic sealing performance in a temperature range of -30°C to 60°C.

[0013] The beneficial effects of this utility model are:

[0014] High airtightness: Through the triple sealing structure of "insertion plate-groove-protrusion", the airtightness is improved by 40% to 60% compared with the traditional solution, which meets the requirements of nitrogen preservation for low leakage rate;

[0015] Food safety: The materials meet food contact standards to prevent chemical migration and contamination of the grain;

[0016] Structural reliability: Anti-aging and temperature difference resistance ensure long-term stability and reduce maintenance costs;

[0017] Standardized adaptation: Compliant with ISO 1496-2 international standard, facilitating mass production and global market access for refrigerated boxes. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0019] Figure 1 This is a schematic diagram of the door structure for a grain storage refrigeration box according to this utility model.

[0020] Figure 2 This is a schematic diagram of the cross-section of the compression strip of the door structure of a grain storage refrigeration box according to this utility model. Detailed Implementation

[0021] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] like Figure 1 and Figure 2 As shown, this utility model embodiment includes: a door structure for a grain storage refrigerator, the specific structure of which is as follows:

[0023] The door body 100 is made of stainless steel sheet with a thickness of 3-5mm and is stamped. The edge is integrally formed with a rectangular rubber strip groove 101 along the circumferential direction. The groove is 8-12mm deep and 6-10mm wide. The inner wall of the groove is sandblasted to form a rough surface to enhance the friction with the pressing rubber strip 200.

[0024] The compression strip 200 is made of food-grade elastic material (such as silicone rubber or EPDM) with a Shore hardness of 60±5. It is long and narrow, with a length matching the groove 101. A continuous groove 201 is provided on the side that contacts the refrigerator door frame. The groove 201 has an inverted trapezoidal cross-section (upper base width 4-6mm, lower base width 2-3mm, depth 3-5mm). Hemispherical protrusions 202 (diameter 1-2mm, height 0.5-1mm, spacing 5-8mm) are spaced at the bottom of the groove 201.

[0025] Insert plate 300: Made of aluminum alloy sheet with a thickness of 2-3mm, it is fixed to the inner edge of the refrigerator door frame. Its length corresponds to the groove 201. The insertion end is machined with a guide slope of 15° to 30°. The width of the end of the slope is slightly smaller than the bottom width of the groove 201 to ensure an interference fit when inserted.

[0026] The raw materials of the compression strip 200 meet the requirements of GB 4806.11-2023 "National Food Safety Standard for Rubber Materials and Products for Food Contact" and have passed the Class 3 test for airtightness in ISO 1496-2:2020 "Series 2 Insulated Containers" standard.

[0027] The inner wall of the groove 201 has a rounded transition (radius 0.5–1 mm), and the raised structures 202 are arranged at equal intervals along the length of the groove 201, with a volume of 0.3–0.5 mm for each individual raised structure. 3 When subjected to pressure, it can produce an elastic deformation of 0.3 to 0.8 mm.

[0028] The guide slope of the insert plate 300 is 5-8mm long. After being inserted into the groove 201, it forms line contact with the protruding structure 202. The compression is controlled at 1.5-2.5mm to ensure that the rubber strip produces a uniform elastic recovery force.

[0029] The anti-slip texture of the inner wall of the rubber strip groove 101 is a continuous serrated pattern (tooth height 0.3~0.5mm, tooth pitch 1~2mm). The pressure rubber strip 200 is integrally formed with the rubber strip groove 101 through a high-temperature vulcanization process (temperature 160~180℃, pressure 10~15MPa), and the peel strength is ≥3N / mm.

[0030] The compression set strip 200 exhibits a compression permanent deformation of ≤25% at -30℃ (22h test) and a tensile strength retention rate of ≥85% at 60℃ (168h aging test), ensuring sealing stability under extreme temperature differences.

[0031] The sealing cooperation between the groove 201 and the protrusion works on the following principle: when the door is closed, the insert plate 300 is inserted into the groove 201 along the guide slope. The protrusion structure 202 in the groove 201 is squeezed by the insert plate 300 to produce elastic deformation, forming multiple "labyrinth-like" sealing contacts (the protrusion and the surface of the insert plate 300, the side wall of the groove 201 and the side of the insert plate 300).

[0032] Compared to the planar contact of traditional square-section rubber strips, this structure enhances local pressure through raised point contact (contact pressure increased by 30% to 50%), effectively blocking gas leakage channels. It is especially suitable for nitrogen-filled preservation scenarios in grain storage cold boxes, and can reduce the gas leakage rate to ≤0.5 vol% / day.

[0033] The compression strip 200 is made of food-grade silicone rubber, which is free of plasticizers, heavy metals and other harmful substances, and is firmly bonded to the box door body 100 through a vulcanization process; it avoids the risk of contamination caused by direct contact between traditional rubber materials and grain, and meets the wide temperature requirements from -30℃ (low temperature transportation) to 60℃ (high temperature disinfection), making it suitable for grain storage environments in different regions.

[0034] The interference fit (compression 1.5-2.5mm) between the insert plate 300 and the groove 201 generates continuous elastic tension in the rubber strip, which counteracts the material shrinkage or expansion caused by temperature changes; it solves the gap problem caused by thermal expansion and contraction in traditional sealing structures, and can still maintain more than 80% of the initial sealing performance after long-term use (≥5 years).

[0035] The working principle of this technical solution is as follows: when the door is closed, the insert plate 300 is inserted into the groove 201 of the pressure strip 200, and the strip is deformed and filled by mechanical pressure; the raised structure 202 enhances the local sealing pressure, the food-grade material ensures storage safety, the anti-slip texture and vulcanization process prevent the strip from falling off, and the wide temperature performance is suitable for extreme environments.

[0036] The advantages of this technical solution are:

[0037] High airtightness: Through the triple sealing structure of "insertion plate 300-groove 201-protrusion", the airtightness is improved by 40% to 60% compared with the traditional solution, which meets the requirements of nitrogen preservation for low leakage rate;

[0038] Food safety: The materials meet food contact standards to prevent chemical migration and contamination of the grain;

[0039] Structural reliability: Anti-aging and temperature difference resistance ensure long-term stability and reduce maintenance costs;

[0040] Standardized adaptation: Compliant with ISO 1496-2 international standard, facilitating mass production and global market access for refrigerated boxes.

[0041] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A door structure for a grain storage refrigerator, characterized in that: include The door body (100) has a rubber strip groove (101) on its edge; A pressure strip (200) is provided in the strip groove (101), and the contact surface between the pressure strip (200) and the refrigerator door frame is provided with a groove (201), and a protrusion structure (202) is provided in the groove (201). Insert plate (300) is provided on the door frame of the refrigerator. When the door is closed, the insert plate (300) is inserted into the groove (201) and forms a sealing fit with the protruding structure (202).

2. The door structure for a grain storage refrigerated box according to claim 1, characterized in that: The compression strip (200) is made of food-grade elastic material.

3. The door structure for a grain storage refrigerated box according to claim 1, characterized in that: The groove (201) has an inverted trapezoidal cross section, and the protrusions (202) are arranged at intervals along the length of the groove (201), with a protrusion height of 0.5mm-2mm.

4. The door structure for a grain storage refrigerated box according to claim 1, characterized in that: The insertion end of the insert plate (300) is provided with a guide slope, which forms an interference fit with the groove (201) and the compression amount is 1mm-3mm.

5. The door structure for a grain storage refrigerated box according to claim 1, characterized in that: The inner wall of the rubber strip groove (101) is provided with anti-slip texture, and the pressure rubber strip (200) and the rubber strip groove (101) are fixed by vulcanization process.

6. The door structure for a grain storage refrigerated box according to claim 1, characterized in that: The pressure strip (200) has a Shore hardness of 60±5 degrees and maintains elastic sealing performance in a temperature range of -30℃ to 60℃.

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