Sealing structure of large-diameter plastic bucket

Abstract

The sealing structure comprises a barrel body and a barrel cover which are matched with each other, the barrel body is in threaded connection with the barrel cover, convex ribs are arranged on the barrel cover, a sealing groove matched with the upper edge of the barrel body is formed on the barrel 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] The present invention relates to the technical field of plastic bucket sealing, and more specifically to a sealing structure for large-diameter plastic buckets. Background Art

[0002] Large-diameter (diameter ≥ 250 mm) plastic buckets are generally used for storing chemical raw materials, and of course, other items can also be stored. Since many chemical raw materials have high requirements for purity, if a sealing ring (made of rubber) is used for sealing, during the opening and closing of the bucket lid, due to friction, rubber particles may enter the chemical raw materials, resulting in the pollution and scrapping of the raw materials. Therefore, large-diameter plastic buckets mostly adopt a sealing structure without a sealing ring.

[0003] At present, the sealing structures adopted by high-sealing large-diameter plastic buckets on the market mainly have the following two methods: one is the hoop-tightening type, and the other is the pressing type. The disadvantage of the hoop-tightening type is that an additional plastic hoop (initially a metal hoop, later improved to a plastic hoop) needs to be configured. The plastic hoop not only increases the manufacturing cost, but also the outer diameter of the plastic hoop is larger than the outer diameter of the plastic bucket, and the setting of the plastic hoop will increase the occupied space and transportation cost. In addition, the tightening and opening of the plastic hoop will increase the opening and closing steps of the plastic bucket. For the pressing type of sealing method, it needs to borrow a pressing device to complete the pressing during the pressing process, which increases the complexity of the covering action. When opening, a blade needs to be used for cutting first, and the operation is very inconvenient; more importantly, it is difficult to perform secondary sealing on the opened plastic bucket, and the reuse rate is poor. Therefore, the existing sealing structures of large-diameter plastic buckets need to be further improved. Summary of the Invention

[0004] The purpose of the present invention is to make up for the above deficiencies and disclose to the society a sealing structure for large-diameter plastic buckets that is simple, reasonable in structure, low in manufacturing cost, and good in sealing performance. The large-diameter plastic bucket adopting the sealing structure of the present invention can be recycled.

[0005] The technical solution of the present invention is realized as follows: A sealing structure for a large-diameter plastic bucket includes a barrel body and a barrel lid that are adapted to each other. The barrel body and the barrel lid are threadedly connected. The barrel lid is provided with convex ribs and forms a sealing groove adapted to the upper edge of the barrel 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 barrel lid, and a convex block is provided on the outer periphery of the barrel body. The fixing buckle is provided with a buckle groove adapted to the convex block.

[0006] The measures to further optimize the technical solution are as follows: As an improvement, the outer side of the convex rib is an inclined surface that slopes outward downward. The inclined surface is used on the outer side, which can make the contact between the convex rib and the barrel body a line contact, thereby improving the sealing performance.

[0007] As an improvement, a guiding surface is provided at the lower end of the rib. The provision of the guiding surface enables the upper edge of the barrel body to more easily enter the sealing groove.

[0008] As an improvement, a pulling part is provided below the buckle groove on the fixing buckle. The provision of the pulling part facilitates applying downward force and the downward buckling of the barrel cover.

[0009] As an improvement, a protrusion with an arc-shaped surface structure is provided on the outside of the sealing groove, and a third sealing line is formed at the top of the arc-shaped surface structure. Through the provision of the protrusion with an arc-shaped surface structure, line contact is ensured and the sealing performance is improved.

[0010] As an improvement, the number of the fixing buckles is 4 - 6. The fixing buckles are evenly distributed on the circumferential surface.

[0011] As an improvement, a bending part is provided between the fixing buckle and the barrel cover.

[0012] As an improvement, a chamfered surface is provided on the outside of the lower end of the convex block. The provision of the chamfered surface facilitates the convex block to enter the buckle groove of the fixing buckle.

[0013] As an improvement, the barrel body and the barrel cover are made of raw materials with a shrinkage rate ≤ 1.5%. To ensure the consistency of the plastic barrel product and the sealing fit between the barrel body and the barrel cover.

[0014] As an improvement, the raw materials of the barrel body and the barrel cover are obtained by mixing PE material and PP material, and the PE material accounts for 10% - 60% of the total mass.

[0015] The advantages of the present invention compared with the prior art are: The sealing structure of a large-diameter plastic barrel of the present invention is simple, reasonable, and has a low manufacturing cost. A sealing groove is provided on the barrel cover, and a first sealing line, a second sealing line, and a third sealing line are correspondingly designed on the inner side, top, and outside of the sealing groove, and fixing buckles are provided on the outer periphery of the barrel cover; when the fixing buckles are buckled and fixed with the convex blocks on the outer periphery of the barrel body, a downward pulling force is generated, enabling the upper edge of the barrel body to enter the sealing groove. Three sealing lines are provided to ensure that at least one sealing line plays a role, thereby ensuring the sealing performance after the barrel cover and the barrel body are closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of an embodiment of the present invention; Figure 2 is Figure 1 an enlarged view of part A in Figure 3 is a schematic structural diagram of the barrel cover of the present invention; Figure 4It is a sectional view structure diagram of the bucket lid of the present invention; Figure 5 It is an enlarged view of the sealing groove part of the embodiment of the present invention; Figure 6 It is an enlarged view of the cooperation between the bucket body and the sealing groove of the embodiment of the present invention.

[0017] The names of the reference numerals in the drawings of the present invention are as follows: Bucket body 1, convex block 11, chamfered surface 11a, bucket lid 2, rib 21, inclined surface 21a, guiding 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, pulling part 31, bending part 32. Detailed implementation manners

[0018] The present invention will be further described in detail below with reference to the drawings: The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and those skilled in the art can think of other obvious deformations. The basic principles defined in the following description can be used in other implementation manners, deformation schemes, improvement schemes, equivalent schemes, and other technical schemes without departing from the spirit and scope of the present invention.

[0019] Those skilled in the art should understand that in the disclosure of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or position based on the orientation or position relationship shown in the drawings. It is only for the convenience of simplifying the description of the present invention, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting the present invention.

[0020] It can be 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, and in other embodiments, the number of the element can be multiple. The term "a" should not be construed as limiting the quantity.

[0021] Such as Figures 1 to 6As shown in the figure, a sealing structure for a large-diameter plastic barrel includes a barrel body 1 and a barrel cover 2 that are adapted to each other. The barrel body 1 and the barrel cover 2 are threadedly connected. A rib 21 is provided on the barrel cover 2, and a sealing groove 22 adapted to the upper edge of the barrel body 1 is formed. 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 circumference of the barrel cover 2, a convex block 11 is provided on the outer circumference of the barrel body 1, and the fixing buckle 3 is provided with a buckle groove 3a adapted to the convex block 11.

[0022] The upper end of the barrel body 1 is provided with an external thread, and the barrel cover 2 is provided with a corresponding 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 size of the entire sealing surface, and the processing difficulty is large. Therefore, the sealing structure of the present invention adopts a line sealing structure.

[0023] The outer side of the rib 21 is an inclined surface 21a with the lower end inclined outward. With such a setting, it is ensured that when the barrel body 1 contacts the outer side of the rib 21, it is a line contact.

[0024] The lower end of the rib 21 is provided with a guiding surface 21b. The setting of the guiding surface 21b facilitates the upper edge of the barrel body 1 to enter the sealing groove 22.

[0025] A pulling part 31 is provided on the fixing buckle 3 below the buckle groove 3a. The setting of the pulling part 31 facilitates applying force downward and facilitates the downward buckling of the barrel cover 2.

[0026] A convex 23 with a circular arc-shaped structure on the surface is provided on the outer side of the sealing groove 22, and a third sealing line 22c is formed at the top of the circular arc-shaped structure. The use of the convex 23 with a circular arc-shaped structure on the surface facilitates processing.

[0027] The number of the fixing buckles 3 is 4 - 6. The 4 - 6 fixing buckles 3 are evenly distributed on the circumferential surface to ensure the uniformity of the buckling locking force. In this embodiment, 4 evenly distributed fixing buckles 3 are used.

[0028] A bending part 32 is provided between the fixing buckle 3 and the barrel cover 2. The thickness of the bending part 32 is less than the thickness of the main body of the fixing buckle 3. Through the setting of the bending part 32, it is convenient for the fixing buckle 3 to be folded.

[0029] A chamfered surface 11a is provided on the outer side of the lower end of the convex block 11. The setting of the chamfered surface 11a enables the convex block 11 to enter the buckle groove 3a of the fixing buckle 3 more smoothly and quickly when the fixing buckle 3 and the convex block 11 are buckled.

[0030] Since the barrel body 1 and the barrel lid 2 are manufactured separately, due to thermal expansion and contraction, the dimensions of the product may change slightly. To enable the barrel lid 2 and the barrel body 1 to be randomly matched, it is necessary to ensure the consistency of the product as much as possible, thereby ensuring the sealing performance of the plastic barrel.

[0031] The barrel body 1 and the barrel lid 2 are made of raw materials with a shrinkage rate ≤ 1.5%. Engineering plastics with a shrinkage rate ≤ 1.5% can be used.

[0032] The shrinkage rate of PP material is between 1.5% - 2%, and the shrinkage rate of PE material is between 2% - 2.5%. In this embodiment, the PE material is modified by the PP material, that is, the PE material and the PP material are mixed as raw materials. The raw materials of the barrel body 1 and the barrel lid 2 are obtained by mixing PE material and PP material, and the PE material accounts for 10% - 60% of the total mass. Due to the mutual penetration of the material crystals, after the PE material and the PP material are mixed, the shrinkage rate decreases significantly. After testing, in this embodiment, the shrinkage rate of the raw materials is between 0.9% - 1.1%. By controlling the shrinkage rate of the raw materials, the consistency of the product is ensured, and thus the sealing performance when the barrel lid 2 and the barrel body 1 are matched is ensured.

[0033] Working principle: For the large - caliber plastic barrel of the present invention, when the barrel lid 2 is closed, first, the barrel lid 2 is screwed to the barrel body 1. When the barrel lid 2 is tightly screwed, the upper edge of the barrel lid 2 is located at the lower end of the convex rib 21. At this time, the upper edge of the barrel lid 2 does not enter the sealing groove 22. Then, the operator holds the pulling part 31 of the fixing buckle 3 and exerts a downward force, so that the convex block 11 on the outer periphery of the barrel body 1 enters the buckle groove 3a of the fixing buckle 3 to achieve snap - fit fixation; when the fixing buckle 3 is snap - fit fixed, the barrel lid 2 will move downward as a whole by 1 - 2 mm, so that the upper edge of the barrel lid 2 enters the sealing groove 22.

[0034] Since the first sealing line 22a, the second sealing line 22b, and the third sealing line 22c are respectively arranged in the sealing groove 22, due to the downward pulling force generated by the fixing buckle 3, and the barrel body 1 has a conical structure (for convenient 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 when they are closed.

[0035] Sealing performance detection: Pour a certain amount (usually 50L) of water into the barrel body 1, close the barrel lid 2 with the barrel body 1, and after buckling the fixing buckles 3 around, invert the plastic barrel and place it at an angle of 45° for 24 hours, then measure the amount of water in the barrel body 1. If the water leakage ≤ 5%, it is considered qualified.

[0036] For 3 groups of products, with 100 plastic barrels in each group, the sealing qualification rates are 100%, 99%, and 100% respectively.

[0037] The above are only the preferred embodiments of the present invention, and thus do not limit the implementation manners and protection scope of the present invention. For those skilled in the art, it should be realized that all the equivalent replacements and obvious changes made by using the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A sealing structure for a large-diameter plastic barrel, comprising a barrel body (1) and a barrel cover (2) that are adapted to each other, characterized in that: The described barrel body (1) and barrel cover (2) are threadedly connected. The barrel cover (2) is provided with a rib (21) and forms a sealing groove (22) adapted to the upper edge of the barrel 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 at 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 barrel cover (2), a convex block (11) is provided on the outer periphery of the barrel body (1), and the fixing buckle (3) is provided with a buckle groove (3a) adapted to the convex block (11).

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

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

4. The sealing structure of a large-caliber plastic barrel according to claim 3, characterized in that: A pulling part (31) is provided on the fixing buckle (3) below the buckle groove (3a).

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

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

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

8. The sealing structure of a large-diameter plastic barrel according to claim 7, characterized in that: A chamfered surface (11a) is provided on the outer side of the lower end of the convex block (11).

9. A sealing structure for a large-caliber plastic barrel according to any one of claims 1 to 8, characterized in that: The barrel body (1) and barrel cover (2) adopt raw materials with a shrinkage rate ≤ 1.5%.

10. A sealing structure for a large-diameter plastic barrel according to claim 9, characterized in that: The raw materials of the barrel body (1) and barrel cover (2) are obtained by mixing PE material and PP material, and the PE material accounts for 10% - 60% of the total mass.

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