A sealed leakproof plastic drum

Abstract

The utility model relates to the technical field of plastic storage and transportation container, specifically discloses a sealed plastic bucket that does not leak, comprising: a barrel body, which is a cylindrical barrel structure with an open top, a sealing step is arranged at the open top of the barrel body, and the threads on the outer wall of the sealing step are connected with the threads on the inner wall of the barrel cover. The sealed plastic bucket that does not leak, the surface contact between the sealing step and the sealing cover forms an initial seal, the axial compression of the auxiliary sealing block on the inner wall of the barrel cover helps to keep the sealing cover always attached to the sealing step, reduces the direct contact between the acid, alkali, organic solvent and the sealing structure, and the L-shaped structure of the sealing ring wraps the outer thread section of the barrel mouth, forming an outer protective layer and further blocking the medium from eroding. At the same time, the trapezoidal tooth type of the outer thread section of the barrel mouth and the polytetrafluoroethylene coating improve the sealing performance, avoid the sealing pressure from dropping due to thread wear, maintain the sealing elasticity, and delay aging and cracking.

Description

Technical Field

[0001] This utility model relates to the field of plastic storage and transportation container technology, specifically a sealed and leak-proof plastic bucket. Background Technology

[0002] Plastic drums are bulk containers made primarily of polyethylene and polypropylene through blow molding and injection molding processes. They are widely used in the storage and transportation of chemical raw materials, packaging of food sauces, storage of daily chemical products, and distribution of agricultural liquids due to their lightweight, corrosion resistance, and low cost. Their basic sealing structure has become a well-known solution in the industry. The core of the sealing of a conventional plastic drum consists of a threaded engagement structure and a sealing element: a standard thread is machined on the outside of the drum opening, and a corresponding internal thread is set on the inside of the drum lid. At the same time, a sealing ring made of silicone, nitrile rubber, or other materials is installed on the end face of the drum lid or the step of the drum opening to meet the basic leak-proof requirements under normal working conditions.

[0003] However, in actual use, the sealing structure of existing plastic buckets is prone to aging, hardening, loss of elasticity, or even cracking due to long-term contact with media such as acids, alkalis, and organic solvents, or the influence of alternating high and low temperature environments. This results in the loss of the sealing and buffering function. Furthermore, the connection strength of the buckle structure is limited. Under the bumps and vibrations of long-distance transportation or the heavy pressure of stacking, the buckles are prone to loosening or breaking, further increasing the risk of sealing failure and causing material leakage and safety hazards. Utility Model Content

[0004] The purpose of this utility model is to provide a sealed and leak-proof plastic bucket to solve the problems mentioned in the background art, such as the sealing ring being prone to aging, hardening, loss of elasticity, or even cracking due to long-term contact with media such as acids, alkalis, and organic solvents, or being affected by alternating high and low temperature environments, thus losing its sealing and buffering function. In addition, the connection strength of the buckle structure is limited, and under the bumps and vibrations of long-distance transportation or the heavy pressure of stacking, the buckle is prone to loosening or breaking, further aggravating the risk of sealing failure and causing material leakage and safety hazards.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a sealed and leak-proof plastic bucket, comprising a bucket body, which is a cylindrical bucket structure with an open top, wherein a sealing step is provided at the top opening of the bucket body, and the threads on the outer wall of the sealing step are connected to the threads on the inner wall of the bucket lid. The side wall of the barrel is symmetrically provided with handle connecting seats, and there are two handle connecting seats. The two handle connecting seats are rotatably connected to both ends of the handle belt. The outer circumference of the top opening of the barrel is integrally formed with an external thread section of the barrel opening. The external threaded section of the barrel opening is adapted to the internal thread opened on the inner wall of the extended sealing ring, and the top of the extended sealing ring slides in the groove. The groove is set on the outer wall of the barrel cover, and the inner wall of the barrel cover is provided with a threaded structure adapted to the sealing step.

[0006] By adopting the above technical solution, the sealing is enhanced by double threaded fit and sliding groove limit, and the handle connection seat is equipped with a handle strap, which improves the convenience of handling.

[0007] Preferably, the bottom of the barrel is provided with a supporting annular protrusion structure, and the top opening of the barrel is covered with a sealing cap to form a sealed space.

[0008] Using the above technical solution, the bottom annular protrusion enhances support stability, and the sealing cap forms an initial seal to prevent leakage.

[0009] Preferably, the thread of the external thread section of the barrel opening is trapezoidal, and the surface of the thread is coated with a polytetrafluoroethylene wear-resistant coating.

[0010] By adopting the above technical solution, the trapezoidal tooth shape increases the contact area, the polytetrafluoroethylene coating reduces friction, and the sealing life is extended.

[0011] Preferably, the sealing step is an integral structure at the top opening of the barrel, and the top of the sealing step is sealed and abuts against the sealing cover.

[0012] Using the above technical solution, the sealing step is integrally molded without gaps, and its contact with the sealing cover enhances the reliability of the initial seal.

[0013] Preferably, the groove on the outer side of the bucket lid is an inwardly recessed annular groove, and the bucket lid has protrusions at the upper and lower ends of the groove to form a C-shaped structure together with the groove.

[0014] Using the above technical solution, the C-shaped groove extends the sealing ring by protrusion limiting it, preventing displacement and ensuring enhanced sealing stability.

[0015] Preferably, an auxiliary sealing block is provided on the top surface of the inner wall of the bucket lid, and the bottom end of the auxiliary sealing block abuts against the top end of the sealing lid.

[0016] By adopting the above technical solution, the auxiliary sealing block axially presses the sealing cover, thereby improving its fit with the sealing step and its sealing performance.

[0017] Preferably, the cross-section of the extended sealing ring is L-shaped, and the height of the extended sealing ring is greater than the width of the groove.

[0018] By adopting the above technical solution, the L-shaped structure increases the contact area, and the height is designed to fit the sliding groove, thereby enhancing the wrap-around sealing effect.

[0019] Compared with the prior art, the beneficial effects of this utility model are: the sealed and leak-proof plastic bucket: 1. The initial seal is formed by the surface contact between the sealing step and the sealing cap. Combined with the axial compression of the auxiliary sealing block on the inner wall of the barrel cap, the sealing cap is always in contact with the sealing step, reducing the direct contact between acids, alkalis, organic solvents and the sealing structure. The L-shaped structure of the extended sealing ring wraps around the external thread section of the barrel opening, forming an outer layer of protection, further blocking the corrosion of the medium. At the same time, the trapezoidal tooth profile of the external thread section of the barrel opening and the polytetrafluoroethylene coating improve the sealing performance and prevent the sealing pressure from dropping due to thread wear. Even in the environment of alternating high and low temperatures, the synergy of multiple structures can still maintain the sealing elasticity and delay aging and cracking. 2. The rigid locking structure with double thread engagement and sliding groove limiting enhances vibration and pressure resistance. The barrel lid and sealing step generate continuous axial preload through threaded engagement. At the same time, the extended sealing ring and the external thread section of the barrel opening are adapted to engage, forming a double threaded locking. Compared with the point contact of the snap-fit, the surface contact of the thread is more evenly stressed. The C-shaped sliding groove on the outer wall of the barrel lid provides axial limiting for the extended sealing ring, preventing the sealing ring from shifting during transportation. Combined with the self-locking characteristics of the thread, it effectively prevents the locking structure from loosening. 3. Furthermore, the barrel body, sealing steps, and external threaded section of the barrel opening are integrally molded, eliminating the risk of leakage caused by splicing gaps. The handle connecting seat is symmetrically and integrally set on the side wall of the barrel body, which improves the load-bearing strength compared to the assembled type. With the rotatable handle, it takes into account both the convenience of handling and structural stability. The annular protrusion structure at the bottom of the barrel body enhances the stability of placement and avoids tipping and damage. The assembly of each sealing structure only requires screwing operation, without special tools. It can still maintain the sealing performance after repeated loading and unloading, achieving a balance between sealing reliability and ease of use. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall external three-dimensional structure of this utility model; Figure 2 This is a schematic diagram of the overall disassembled three-dimensional structure of this utility model; Figure 3 This is a schematic diagram of the overall internal side section of the present invention. Figure 4 This is a schematic diagram of the installation cross-sectional structure of the sealing cap and barrel lid of this utility model; Figure 5 This is a schematic diagram of the overall internal three-dimensional structure of this utility model; Figure 6 This utility model Figure 5 Enlarged structural diagram at point A in the middle.

[0021] In the diagram: 1. Bucket body; 2. Handle connector; 3. Handle strap; 4. External threaded section at the bucket opening; 5. Sealing step; 6. Sealing cap; 7. Auxiliary sealing block; 8. Bucket lid; 9. Slide groove; 10. Extended sealing ring. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figures 1-6 This utility model provides a technical solution: a sealed and leak-proof plastic bucket, including a bucket body 1, a handle connecting seat 2, a handle strap 3, an external threaded section at the bucket mouth 4, a sealing step 5, a sealing cover 6, an auxiliary sealing block 7, a bucket lid 8, a sliding groove 9, and an extended sealing ring 10. Among them, the barrel body 1 is a cylindrical barrel structure with an open top. A sealing step 5 is provided at the top opening of the barrel body 1, and the thread on the outer wall of the sealing step 5 is connected to the thread on the inner wall of the barrel cover 8. The sealing step 5 is an integral structure at the top opening of the barrel body 1, and the top of the sealing step 5 is sealed and abutted against the sealing cover 6. The side wall of the barrel body 1 is symmetrically provided with handle connecting seats 2, and there are two handle connecting seats 2. The bottom end of the barrel body 1 is provided with a supporting annular protrusion structure, and the top opening of the barrel body 1 is covered with a sealing cap 6 to form a sealed space. The two handle connecting seats 2 are rotatably connected to the two ends of the handle strap 3 respectively. The outer circumference of the top opening of the barrel body 1 is integrally formed with a barrel mouth external thread section 4. The thread of the barrel mouth external thread section 4 is a trapezoidal tooth profile, and the surface of the thread is coated with a polytetrafluoroethylene wear-resistant coating. Referring to the attached diagrams in the instruction manual Figures 1-6 As shown, two handle connecting seats 2 are symmetrically arranged on the side wall of the barrel body 1 and are rotatably connected to the handle strap 3. The handle strap 3 can freely rotate around the handle connecting seat 2 to adapt to the change of grip angle during handling and improve the ease of operation. The integrated molding structure of the handle connecting seat 2 and the barrel body 1 ensures the load-bearing strength and avoids the connection from breaking during handling. Place the barrel body 1 on a flat surface. Its bottom ring-shaped protrusion structure distributes the weight and provides stable support. The sealing step 5 at the top of the barrel body 1 is an integrated molding structure. The ring-shaped end face provides a flat sealing reference surface. Before assembly, first cover the top opening of the barrel body 1 with the sealing cap 6 so that the bottom end of the sealing cap 6 fits against the top surface of the sealing step 5. The contact between the two surfaces forms the first initial seal, blocking the basic path for material to leak directly to the outside. During installation, take the sealing cap 6 and cover the top opening of the barrel body 1 so that the bottom end of the sealing cap 6 fits tightly against the top surface of the integrated sealing step 5 of the barrel body 1 to complete the initial end face seal. Align the lid 8 with the sealing step 5, and screw the inner thread of the lid 8 with the outer thread of the sealing step 5 until the thread engagement generates axial preload. At this time, the auxiliary sealing block 7 on the top surface of the inner wall of the lid 8 moves down synchronously, and the bottom end abuts against the top of the sealing cover 6, axially pressing and strengthening the sealing surface pressure to form a double main seal. While screwing the lid 8, the L-shaped extended sealing ring 10 is adapted to the outer thread section 4 of the barrel opening at the top of the barrel body 1 through the inner wall thread, so that the top of the extended sealing ring 10 slides up and down and rotates in the C-shaped sliding groove 9 on the outer wall of the lid 8. The protrusion of the sliding groove 9 limits the extension sealing ring 10, completing the wrap-around reinforced seal. The external thread section 4 of the barrel opening is adapted to the internal thread opened on the inner wall surface of the extended sealing ring 10, and the top of the extended sealing ring 10 slides in the groove 9. The groove 9 is set on the outer wall surface of the barrel cover 8, and the inner wall surface of the barrel cover 8 is provided with a thread structure adapted to the sealing step 5. The groove 9 on the outer side of the barrel cover 8 is an inwardly recessed annular groove, and the barrel cover 8 is provided with protrusions at the upper and lower ends of the groove 9, which together with the groove 9 form a C-shaped structure. An auxiliary sealing block 7 is provided on the top surface of the inner wall of the barrel cover 8, and the bottom end of the auxiliary sealing block 7 abuts against the top of the sealing cover 6. The cross-section of the extended sealing ring 10 is an L-shaped structure, and the height of the extended sealing ring 10 is greater than the width of the groove 9. Referring to the attached diagrams in the instruction manual Figures 1-6 As shown, after the material is loaded, the sealing cap 6 end face, the barrel cover 8 threaded radial positioning, the auxiliary sealing block 7 axial sealing, and the extended sealing ring 10 wrapping form a quadruple seal to work together to block leakage. The trapezoidal tooth profile of the external thread section 4 of the barrel opening and the polytetrafluoroethylene coating reduce static wear and maintain sealing performance. By holding the handle strap 3, it can freely rotate around the handle connecting seat 2 to adapt to the holding angle. The integrated connecting seat ensures the load-bearing strength and avoids breakage during transportation. The bottom protrusion of the barrel body 1 provides continuous and stable support to prevent tipping. When disassembling, the sealing ring 10 and the barrel cover 8 can be loosened by rotating in the opposite direction. The sealing cover 6 can be directly removed. Each sealing structure has minimal wear and can be reassembled and used repeatedly.

[0024] Working principle: When using this leak-proof plastic bucket, the annular protrusion at the bottom of the bucket body 1 contacts the placement surface to distribute weight and prevent deformation. The integrated sealing step 5 at the top provides a flat sealing reference. The sealing cap 6 is placed on the top opening of the bucket body 1, so that the bottom end of the sealing cap 6 fits against the top surface of the sealing step 5, forming an initial end face seal and blocking the basic path of material leakage. Align the bucket cap 8 and the sealing step 5, and screw the inner wall thread of the bucket cap 8 and the outer wall thread of the sealing step 5 together. The axial pre-tightening force makes the two fit tightly together to form a radial main seal. The auxiliary sealing block 7 on the top surface of the inner wall of the bucket cap 8 moves down with the screwing and its bottom end abuts against the top of the sealing cap 6, axially pressing the sealing cap 6 and the sealing step 5 to strengthen the pressure of the initial sealing surface. When the lid 8 is screwed on, the extended sealing ring 10 is screwed on by the inner wall thread and the external thread section 4 of the top of the barrel opening of the barrel body 1. The top of the ring is embedded in the C-shaped groove 9 on the outer wall of the lid 8. The groove 9 is raised at the top and bottom to limit and prevent it from falling off. The horizontal section of the L-shaped extended sealing ring 10 fits the outer circumference of the barrel body 1, and the vertical section seals the external thread section 4 of the barrel opening, forming a wrap-around seal. The trapezoidal tooth shape and polytetrafluoroethylene coating improve wear resistance and sealing durability. The handle connecting seat 2 on the side wall of the barrel body 1 is rotatably connected to the handle strap 3 to adapt to the handling and grip angle. The integrated structure ensures the load-bearing strength. The four-fold sealing and wear-resistant, limiting structure achieves leak prevention. The handle and bottom protrusion ensure convenient operation and stability, increasing the overall practicality.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sealed, leak-proof plastic bucket, comprising: The barrel body (1) is a cylindrical barrel structure with an open top. A sealing step (5) is provided at the top opening of the barrel body (1), and the thread on the outer wall of the sealing step (5) is connected to the thread on the inner wall of the barrel cover (8). The features are as follows: a handle connecting seat (2) is symmetrically arranged on the side wall of the barrel body (1), and there are 2 handle connecting seats (2). The 2 handle connecting seats (2) are rotatably connected to both ends of the handle strap (3). The outer circumference of the top opening of the barrel body (1) is integrally formed with a barrel mouth external thread section (4). The external thread section (4) of the barrel opening is adapted to the internal thread opened on the inner wall of the extended sealing ring (10), and the top of the extended sealing ring (10) slides in the groove (9). The groove (9) is set on the outer wall of the barrel cover (8), and the inner wall of the barrel cover (8) is provided with a thread structure adapted to the sealing step (5).

2. The leak-proof plastic bucket according to claim 1, characterized in that: The bottom of the barrel body (1) is provided with a supporting annular protrusion structure, and the top opening of the barrel body (1) is covered with a sealing cap (6) to form a sealed space.

3. The leak-proof plastic bucket according to claim 1, characterized in that: The external thread section (4) of the barrel opening has a trapezoidal tooth profile, and the surface of the thread is coated with a polytetrafluoroethylene wear-resistant coating.

4. A leak-proof plastic bucket according to claim 1, characterized in that: The sealing step (5) is an integral structure at the top opening of the barrel body (1), and the top of the sealing step (5) is sealed and abutted against the sealing cover (6).

5. A leak-proof plastic bucket according to claim 1, characterized in that: The groove (9) on the outer side of the bucket lid (8) is an inwardly recessed annular groove, and the bucket lid (8) has protrusions at the upper and lower ends of the groove (9) to form a C-shaped structure together with the groove (9).

6. A leak-proof plastic bucket according to claim 1, characterized in that: An auxiliary sealing block (7) is provided on the top surface of the inner wall of the bucket lid (8), and the bottom end of the auxiliary sealing block (7) abuts against the top end of the sealing lid (6).

7. A leak-proof plastic bucket according to claim 1, characterized in that: The cross-section of the extended sealing ring (10) is L-shaped, and the height of the extended sealing ring (10) is greater than the width of the groove (9).

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