Sealing structure of large-diameter plastic bucket

Abstract

The utility model discloses a sealing structure of a large-caliber plastic bucket, which comprises a bucket body and a bucket cover which are matched with each other, the bucket body is in threaded connection with the bucket cover, a convex rib is arranged on the bucket cover, a sealing groove matched with the upper edge of the bucket body is formed on the bucket cover, a first sealing line is arranged on the inner side of the sealing groove, and a second sealing line is arranged on the outer side of the sealing groove. A second sealing line is arranged at the top of the sealing groove, a third sealing line is arranged on the outer side of the sealing groove, a fixing buckle is arranged on the periphery of the barrel cover, a protruding block is arranged on the periphery of the barrel body, and the fixing buckle is provided with a buckling groove matched with the protruding block. The barrel cover is simple and reasonable in structure, low in manufacturing cost and capable of being recycled, when the fixing buckle is buckled and fixed to the protruding block on the periphery of the barrel body, downward pulling force can be generated, so that the upper edge of the barrel body enters the sealing groove, the three sealing lines are arranged, it is guaranteed that at least one sealing line plays a role, the high sealing requirement is met, and the sealing performance after the barrel cover and the barrel body are closed is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of plastic bucket sealing technology, specifically a sealing structure for large-diameter plastic buckets. Background Technology

[0002] Large-diameter (≥250mm) plastic drums are generally used to store chemical raw materials, but they can also store other items. Since many chemical raw materials require high purity, if a sealing ring (made of rubber) is used for sealing, rubber particles may enter the chemical raw materials due to friction during the opening and closing of the lid, causing contamination and spoilage. Therefore, large-diameter plastic drums mostly adopt a sealing structure without a sealing ring.

[0003] Currently, the sealing structures used in large-diameter plastic drums with high sealing capacity on the market mainly fall into two categories: clamping and compression. The clamping type has the disadvantage of requiring an additional plastic clamp (initially metal, later improved to plastic). This plastic clamp not only increases manufacturing costs, but its outer diameter is larger than the drum's, increasing space requirements and transportation costs. Furthermore, tightening and loosening the clamp adds steps to opening and closing the drum. The compression type requires clamping equipment for tightening, increasing the complexity of the lid-closing process. Opening requires cutting with a blade, making operation inconvenient. More importantly, the opened drum is difficult to reseal, resulting in poor reusability. Therefore, the existing sealing structures for large-diameter plastic drums need further improvement. Utility Model Content

[0004] The purpose of this utility model is to overcome the above-mentioned deficiencies and to disclose to the public a sealing structure for a large-diameter plastic bucket that is simple and reasonable in structure, low in manufacturing cost, and has good sealing performance. The large-diameter plastic bucket using the sealing structure of this utility model can be recycled.

[0005] The technical solution of this utility model is implemented as follows:

[0006] A sealing structure for a large-diameter plastic bucket includes a matching bucket body and a bucket lid, wherein the bucket body and the bucket lid are threaded together, the bucket lid is provided with a raised rib and forms a sealing groove that matches the upper edge of the bucket body, a first sealing line is provided on the inner side of the sealing groove, a second sealing line is provided on the top of the sealing groove, and a third sealing line is provided on the outer side of the sealing groove, a fixing buckle is provided on the outer periphery of the bucket lid, a protrusion is provided on the outer periphery of the bucket body, and the fixing buckle is provided with a buckle groove that matches the protrusion.

[0007] Further optimization measures for this technical solution are as follows:

[0008] As an improvement, the outer side of the rib is a sloped surface with its lower end sloping outwards. This sloped outer side ensures that the rib makes line contact with the barrel body, thereby improving sealing.

[0009] As an improvement, the lower end of the rib is provided with a guide surface. The guide surface makes it easier for the upper edge of the barrel to enter the sealing groove.

[0010] As an improvement, a handle is provided below the buckle groove on the fixing buckle. The handle facilitates downward force and makes it easier to fasten the lid downwards.

[0011] As an improvement, the outer side of the sealing groove is provided with a protrusion with a circular arc-shaped surface, and a third sealing line is formed at the top of the circular arc-shaped structure. The circular arc-shaped protrusion ensures line contact and improves sealing performance.

[0012] As an improvement, the number of fixing buckles is 4-6. The fixing buckles are evenly distributed on the circumferential surface.

[0013] As an improvement, a bent portion is provided between the fixing buckle and the bucket lid.

[0014] As an improvement, the lower outer side of the protrusion is provided with a chamfered surface. The chamfered surface facilitates the protrusion's entry into the retaining groove of the fastener.

[0015] The advantages of this utility model compared with the prior art are:

[0016] This utility model discloses a sealing structure for a large-diameter plastic bucket. The structure is simple, reasonable, and low in manufacturing cost. A sealing groove is provided on the bucket lid, and a first sealing line, a second sealing line, and a third sealing line are designed on the inner side, top, and outer side of the sealing groove, respectively. A fixing buckle is provided on the outer periphery of the bucket lid. When the fixing buckle is engaged with the protrusion on the outer periphery of the bucket body, a downward pulling force is generated, causing the upper edge of the bucket body to enter the sealing groove. The three sealing lines ensure that at least one sealing line is effective, thereby ensuring the sealing performance of the bucket lid and the bucket body after they are closed. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;

[0018] Figure 2 yes Figure 1 Enlarged view of section A in the middle;

[0019] Figure 3 This is a schematic diagram of the structure of the bucket lid of this utility model;

[0020] Figure 4 This is a cross-sectional view of the bucket lid of this utility model;

[0021] Figure 5 This is an enlarged view of the sealing groove portion of an embodiment of the present utility model;

[0022] Figure 6 This is an enlarged view of the barrel body and sealing groove fitting together in an embodiment of this utility model.

[0023] The names of the reference numerals in the accompanying drawings of this utility model are:

[0024] Bucket body 1, protrusion 11, chamfered surface 11a, bucket lid 2, rib 21, inclined surface 21a, guide surface 21b, sealing groove 22, first sealing line 22a, second sealing line 22b, third sealing line 22c, protrusion 23, fixing buckle 3, buckle groove 3a, handle part 31, bending part 32. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings:

[0026] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious modifications will be apparent to those skilled in the art. The basic principles of the present invention defined in the following description can be used in other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0027] Those skilled in the art should understand that in the disclosure of this utility model, the terms "longitudinal", "lateral", "up", "down", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or position based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0028] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0029] like Figures 1 to 6As shown, a sealing structure for a large-diameter plastic bucket includes a bucket body 1 and a bucket lid 2 that are adapted to each other. The bucket body 1 and the bucket lid 2 are threaded together. The bucket lid 2 is provided with a raised rib 21 and forms a sealing groove 22 that is adapted to the upper edge of the bucket body 1. A first sealing line 22a is provided on the inner side of the sealing groove 22, a second sealing line 22b is provided on the top of the sealing groove 22, and a third sealing line 22c is provided on the outer side of the sealing groove 22. A fixing buckle 3 is provided on the outer periphery of the bucket lid 2, and a protrusion 11 is provided on the outer periphery of the bucket body 1. The fixing buckle 3 is provided with a buckle groove 3a that is adapted to the protrusion 11.

[0030] The upper end of the barrel body 1 is provided with an external thread, and the barrel cover 2 is provided with a matching internal thread. The barrel cover 2 is threadedly connected to the barrel body 1. If a sealing surface is used for sealing, it is necessary to ensure the consistency of the dimensions of the entire sealing surface, which is difficult to process. Therefore, the sealing structure of this utility model adopts a line sealing structure.

[0031] The outer side of the rib 21 is an outwardly sloping surface 21a at its lower end. This design ensures that the barrel body 1 makes line contact with the outer side of the rib 21.

[0032] The lower end of the protruding rib 21 is provided with a guide surface 21b. The guide surface 21b facilitates the upper edge of the barrel 1 entering the sealing groove 22.

[0033] The fixing buckle 3 is provided with a handle part 31 below the buckle groove 3a. The handle part 31 is provided to facilitate downward force and facilitate downward fastening of the bucket lid 2.

[0034] The outer side of the sealing groove 22 is provided with a protrusion 23 with a circular arc structure, and a third sealing line 22c is formed at the top of the circular arc structure. The protrusion 23 with a circular arc structure is easy to process.

[0035] The number of fixing buckles 3 is 4-6. These 4-6 fixing buckles 3 are evenly distributed on the circumferential surface to ensure uniform locking force. In this embodiment, 4 evenly distributed fixing buckles 3 are used.

[0036] A bending portion 32 is provided between the fixing buckle 3 and the bucket lid 2. The thickness of the bending portion 32 is less than the thickness of the main body of the fixing buckle 3, and the bending portion 32 facilitates the folding of the fixing buckle 3.

[0037] The lower outer side of the protrusion 11 is provided with a chamfered surface 11a. The chamfered surface 11a allows the protrusion 11 to enter the buckle groove 3a of the buckle 3 more smoothly and quickly when the fixing buckle 3 is engaged with the protrusion 11.

[0038] Since the bucket body 1 and the bucket lid 2 are manufactured separately, and due to thermal expansion and contraction, the dimensions of the product may change slightly. In order for the bucket lid 2 and the bucket body 1 to fit together randomly, it is necessary to ensure the consistency of the product as much as possible, thereby ensuring the airtightness of the plastic bucket.

[0039] The barrel body 1 and barrel lid 2 are made of raw materials with a shrinkage rate of ≤1.5%. Engineering plastics with a shrinkage rate of ≤1.5% can be used.

[0040] The shrinkage rate of PP material is 1.5%-2%, and the shrinkage rate of PE material is 2%-2.5%. In this embodiment, PE material is modified by PP material, that is, the raw materials of PE and PP materials are mixed. The raw materials of the barrel body 1 and the barrel lid 2 are obtained by mixing PE and PP materials, and the PE material accounts for 10%-60% of the total mass. Due to the interpenetration of the material crystals, the shrinkage rate of PE and PP materials is significantly reduced after mixing. According to the test, the shrinkage rate of the raw materials in this embodiment is 0.9%-1.1%. By controlling the shrinkage rate of the raw materials, the consistency of the product is ensured, thereby ensuring the sealing performance when the barrel lid 2 and barrel body 1 are fitted together.

[0041] Working principle:

[0042] In this invention, for a large-diameter plastic bucket, when the lid 2 is closed, it is first screwed onto the bucket body 1. After the lid 2 is screwed tight, the upper edge of the lid 2 is located at the lower end of the rib 21. At this time, the upper edge of the lid 2 has not yet entered the sealing groove 22. Then, the operator holds the handle 31 of the fixing buckle 3 and applies downward force to make the protrusion 11 on the outer periphery of the bucket body 1 enter the buckle groove 3a of the fixing buckle 3 to achieve fastening and fixation. When the fixing buckle 3 is fastened and fixed, the lid 2 will move downward by 1-2mm, so that the upper edge of the lid 2 enters the sealing groove 22.

[0043] Since the sealing groove 22 is provided with a first sealing line 22a, a second sealing line 22b, and a third sealing line 22c respectively, and the fixing buckle 3 generates a downward pulling force, and the barrel body 1 has a conical structure (for easy storage), under the action of the downward pulling force, the upper edge of the barrel body 1 will contact at least one of the first sealing line 22a, the second sealing line 22b, and the third sealing line 22c to form a seal, thereby ensuring the sealing performance of the barrel lid 2 and the barrel body 1.

[0044] Sealing test: Pour a fixed amount (usually 50L) of water into the container 1, cover the container 1 with the lid 2, fasten the fasteners 3 around the sides, invert the plastic container and tilt it at 45° for 24 hours, then measure the amount of water in the container 1. If the water leakage is ≤5%, it is considered qualified.

[0045] Three groups of products, each consisting of 100 plastic buckets, were tested, and the sealing pass rates were 100%, 99%, and 100%, respectively.

[0046] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sealing structure for a large-diameter plastic bucket, comprising a bucket body (1) and a bucket lid (2) that are compatible with each other, characterized in that: The barrel body (1) and the barrel lid (2) are threaded together. The barrel lid (2) is provided with a rib (21) and forms a sealing groove (22) that matches the upper edge of the barrel body (1). The inner side of the sealing groove (22) is provided with a first sealing line (22a), the top of the sealing groove (22) is provided with a second sealing line (22b), and the outer side of the sealing groove (22) is provided with a third sealing line (22c). The outer periphery of the barrel lid (2) is provided with a fixing buckle (3), and the outer periphery of the barrel body (1) is provided with a protrusion (11). The fixing buckle (3) is provided with a buckle groove (3a) that matches the protrusion (11).

2. The sealing structure of a large-diameter plastic bucket according to claim 1, characterized in that: The outer side of the convex rib (21) is an outward inclined surface (21a) at the lower end.

3. The sealing structure of a large-diameter plastic bucket according to claim 2, characterized in that: The lower end of the rib (21) is provided with a guide surface (21b).

4. The sealing structure of a large-diameter plastic bucket according to claim 3, characterized in that: The fixing buckle (3) is provided with a handle (31) below the buckle groove (3a).

5. The sealing structure of a large-diameter plastic bucket according to claim 4, characterized in that: The outer side of the sealing groove (22) is provided with a protrusion (23) with a circular arc structure, and a third sealing line (22c) is formed at the top of the circular arc structure.

6. The sealing structure of a large-diameter plastic bucket according to claim 5, characterized in that: The number of fixing buckles (3) is 4-6.

7. The sealing structure of a large-diameter plastic bucket according to claim 6, characterized in that: A bend (32) is provided between the fixing buckle (3) and the bucket lid (2).

8. The sealing structure of a large-diameter plastic bucket according to claim 7, characterized in that: The lower outer side of the protrusion (11) is provided with a chamfered surface (11a).

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