Container door hinge

Abstract

The utility model discloses a container door hinge, including base, connecting shaft, door hinge and bushing, base assembly is on the box of container, is equipped with the door hinge lug on the base, is equipped with the column hole on the door hinge lug, door hinge assembly is on the door of container, is equipped with the column pin on the door hinge, when door hinge assembly, the column pin inserts and sets up in the door hinge ear with the coaxial arrangement of column hole, and connecting shaft inserts from top to bottom in the column hole and column pin to complete the assembly of door hinge and door hinge ear. The utility model has the beneficial effects that: prolong the life: the self -lubricating of nylon bushing reduces the friction loss, and the protruding 302 of bushing avoids the direct contact of steel parts, and the hinge life is improved by more than 30% than the conventional structure, reduce the maintenance cost: need not regularly replace the gasket or supplementary coating anticorrosive layer, and the maintenance cycle is prolonged to more than 2 years, strong adaptability: the integral type bushing is applicable to conventional scene, and the split type bushing is applicable to high precision scene, and the assembly demand of different container door is satisfied.

Description

Technical Field

[0001] This utility model relates to the field of container technology, and in particular to a container door hinge. Background Technology

[0002] As the core carrier of modern logistics transportation, the flexibility and durability of the container doors directly affect the efficiency of cargo transportation and the service life of the container. Door hinges, as key connecting components between the door and the container body, must withstand the weight of the door and the mechanical stress of frequent opening and closing over long periods. Therefore, high requirements are placed on their wear resistance, corrosion resistance, and structural reliability.

[0003] Traditional container door hinges typically use a steel structure, mainly composed of a base (fixed to the container body), hinge lugs (located on the base), a hinge (fixed to the door), a pin (located on the hinge), and a connecting shaft (passing through the hinge lug and the pin). To reduce frictional resistance during hinge rotation, existing technologies usually add gaskets (mostly made of steel or plastic) at the contact point between the pin and the hinge lug, and coat the hinge surface with an anti-corrosion coating (such as epoxy zinc-rich paint). However, this structure has the following significant drawbacks:

[0004] Firstly, traditional shims are fixed to the bottom of the door hinge lugs. When the door opens and closes, the hinge pin rotates around the connecting shaft, causing the pin end to generate "static-dynamic friction" with the fixed shim (the shim is stationary and the pin rotates). Long-term friction will gradually damage the anti-corrosion coating on the pin or the hinge lug surface, causing the steel substrate to be directly exposed to humid air or salt spray environment, eventually leading to rust, causing the hinge to jam or even fail.

[0005] Secondly, the coefficient of friction between the steel gasket and the steel pin is relatively high (about 0.3-0.5), resulting in high rotational resistance. This not only increases the difficulty of opening and closing the door, but also accelerates component wear and shortens the service life of the hinge.

[0006] Third, traditional gaskets are independent components that require precise positioning during installation, and they are prone to falling off due to vibration after long-term use, resulting in high maintenance costs.

[0007] While existing technologies have attempted to address the aforementioned issues by optimizing gasket materials (such as using nylon) or increasing coating thickness, they have not completely resolved the coating wear problem caused by static-dynamic friction. Therefore, there is an urgent need for a container door hinge design that can avoid direct friction between steel components, reduce rotational resistance, and ensure structural reliability. Utility Model Content

[0008] The main technical problem solved by this utility model is to provide a container door hinge, thereby solving one or more of the above-mentioned prior art problems.

[0009] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a container door hinge, the innovation of which is: including a base, a connecting shaft, a door hinge chain, and a bushing; the base is assembled on the container body, the base is provided with a door hinge lug, and the door hinge lug is provided with a pin hole; the door hinge chain is assembled on the container door, and the door hinge chain is provided with a pin; when the door hinge chain is assembled, the pin is inserted into the door hinge lug and is coaxially arranged with the pin hole, and the connecting shaft is inserted from top to bottom into the pin hole and the pin to complete the assembly of the door hinge chain and the door hinge lug; the bushing is disposed in the pin and is coaxial with the pin, and its end is provided with a bushing protrusion, which is located between the inner side of the door hinge lug and the end of the pin during assembly, and is used to isolate the friction surface between the pin and the door hinge lug.

[0010] In some embodiments, the bushing adopts an integral or split structure; when it is integral, the bushing protrusion may be provided only at the bottom end of the bushing, or one may be provided at each end of the bushing; when it is split, a bushing is installed at each end of the pin, and a bushing protrusion is provided at the end of each bushing.

[0011] In some implementations, the bushing is made of a self-lubricating and rust-resistant material such as nylon.

[0012] In some implementations, a clearance fit or an interference fit is used between the connecting shaft and the column hole or pin to ensure rotational flexibility or connection stability.

[0013] In some embodiments, the door hinge lug is a structure of two parallel ear plates with coaxially aligned post holes on the two ear plates, and a post pin is inserted into the gap between the two ear plates.

[0014] In some embodiments, the bushing protrusion is an annular flange-shaped structure with an outer diameter larger than that of the pin, and it contacts and engages with the inner side of the hinge lug and the end of the pin.

[0015] In some embodiments, the door hinge is fixedly connected to the box door by bolts, and the base is fixedly connected to the box body by bolts.

[0016] The beneficial effects of this utility model are: extended service life: the self-lubricating property of the nylon bushing reduces friction loss, and the bushing protrusion 302 avoids direct contact between steel parts, increasing the hinge life by more than 30% compared to traditional structures; reduced maintenance costs: there is no need to regularly replace gaskets or apply anti-corrosion coatings, extending the maintenance cycle to more than 2 years; strong adaptability: the integral bushing is suitable for conventional scenarios, while the split bushing is suitable for high-precision scenarios, meeting the assembly requirements of different container doors; high reliability: the nylon material has strong corrosion resistance (salt spray test ≥1000 hours), avoiding hinge jamming caused by rust. Attached Figure Description

[0017] 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:

[0018] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the container door hinge of this utility model.

[0019] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the container door hinge of this utility model. Detailed Implementation

[0020] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. 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.

[0021] like Figure 1 and Figure 2 As shown in the figure, the embodiment of this utility model includes: a container door hinge. The structure, working principle and advantages of the hinge will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] This container door hinge mainly consists of a base, hinge lug 100, connecting shaft, hinge 200, pin 202, and bushing 301, as detailed below:

[0023] The base is made of Q235 steel and is fixedly connected to the container body by M8 bolts. The top of the base is integrally formed with two parallel door hinge ears 100 (ear plate thickness 5mm, spacing matching the length of the pin 202 of the door hinge 200). Each door hinge ear 100 has a φ12mm post hole (tolerance H8) in the center, and the two post holes are coaxially aligned.

[0024] The door hinge 200 is made of the same Q235 steel as the base and is fixedly connected to the container door by M6 bolts. A pin 202 (diameter φ12mm, length 20mm, tolerance f7) is provided vertically on its inner side. A through hole of φ10mm is opened in the center of the pin 202 (for the connecting shaft to pass through).

[0025] The connecting shaft is made of 45# steel, with a diameter of φ10mm (tolerance g6) and a length of 30mm. It forms a clearance fit (clearance 0.02-0.05mm) with the through hole of the column hole and the column pin 202 to ensure that the door hinge 200 rotates flexibly around the connecting shaft.

[0026] The bushing 301 is made of Nylon 66 (low self-lubricating coefficient, strong corrosion resistance) and is fitted into the through hole of the pin 202 (outer diameter φ10mm, interference fit with the pin 202; inner diameter φ10mm, clearance fit with the connecting shaft). Its end is provided with an annular flange-shaped bushing protrusion 302 (outer diameter φ14mm, height 1mm) to isolate the friction surface between the end of the pin 202 and the inner side of the door hinge lug 100.

[0027] Example 1

[0028] like Figure 1 As shown, in this embodiment, the bushing 301 is an integral structure (20mm in length, the same length as the through hole of the pin 202), and the bushing protrusion 302 is provided at both ends of the bushing 301, with one bushing protrusion 302 provided only at the bottom end or one bushing protrusion 302 at both the bottom and top ends.

[0029] During installation: First, insert the pin 202 of the door hinge 200 into the gap between the two door hinge ears 100, ensuring that the through hole of the pin 202 is coaxially aligned with the pin hole of the door hinge ear 100; then, press the integral bushing 301 from the top of the pin 202 into its through hole (interference 0.01-0.02mm), at which point the bushing protrusion 302 abuts against the inner side of the door hinge ear 100 (top protrusion) and the bottom end of the pin 202 (bottom protrusion); finally, pass the connecting shaft from top to bottom through the top pin hole of the door hinge ear 100, the inner hole of the bushing 301, and the bottom pin hole of the door hinge ear 100 to complete the assembly.

[0030] When the door opens and closes, the door hinge 200 rotates around the connecting shaft, and the pin 202 rotates synchronously with the door hinge 200. Due to the interference fit between the bushing 301 and the pin 202, the bushing 301 rotates synchronously with the pin 202. The bushing protrusions 302 at both ends are always positioned between the end of the pin 202 and the inner side of the hinge lug 100, preventing direct friction between the steel pin 202 and the steel hinge lug 100 (in traditional structures, the washer is fixed to the bottom of the hinge lug 100, and the pin 202 rubs against the washer when rotating, causing coating wear). Simultaneously, the nylon bushing 301 has good self-lubricating properties (friction coefficient of only 0.1-0.2), further reducing rotational resistance and preventing rust, effectively extending the hinge's lifespan.

[0031] III. Example 2

[0032] like Figure 2 As shown, in this embodiment, the bushing 301 is a split structure (composed of two independent short bushings, each with a length of 10mm), and each short bushing has a bushing protrusion 302 (outer diameter φ14mm, height 1mm) at its end.

[0033] During installation: First, press the two short bushings into the through holes of the pin 202 from the top and bottom ends respectively (interference allowance 0.01-0.02mm), ensuring that the protrusion of the top short bushing abuts against the inside of the hinge lug 100 and the protrusion of the bottom short bushing abuts against the bottom end of the pin 202; the remaining assembly steps are the same as in Example 1.

[0034] Split bushings are suitable for applications requiring high precision machining of the through-hole in the pin 202 (e.g., tolerance f7) and small clearance (≤0.03mm). Because the two short bushings are installed independently, their positions within the pin 202 can be adjusted separately, avoiding assembly jamming issues caused by length errors in integral bushings. Simultaneously, the bushing protrusions 302 at both ends synchronously isolate the friction surfaces, providing the same protection as the integral bushing, but with greater installation flexibility, making it particularly suitable for the assembly requirements of high-precision container door hinges.

[0035] The working principle of this technical solution is as follows: Through the structural design of bushing 301 and bushing protrusion 302, this hinge transforms the "static-dynamic friction" of traditional fixed washers into "dynamic-dynamic friction" (the bushing 301 rotates synchronously with the pin 202, remaining relatively stationary with the connecting shaft), thus avoiding direct friction between steel components. Combined with the self-lubricating and rust-proof properties of nylon material, it effectively solves the problem of wear and rust on the anti-corrosion coating caused by friction in traditional hinges.

[0036] The advantages of this technical solution are:

[0037] Extended service life: The self-lubricating properties of the nylon bushing reduce friction loss, and the bushing protrusion 302 avoids direct contact between steel components, increasing hinge life by more than 30% compared to traditional structures.

[0038] Reduced maintenance costs: No need to regularly replace gaskets or reapply anti-corrosion coatings; maintenance cycle extended to more than 2 years.

[0039] High adaptability: integral bushings are suitable for conventional scenarios, while split bushings are suitable for high-precision scenarios, meeting the assembly requirements of different container doors;

[0040] High reliability: The nylon material has strong corrosion resistance (salt spray test ≥1000 hours), avoiding the problem of hinge jamming caused by rust.

[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 container door hinge, characterized in that: The system includes a base, a connecting shaft, a door hinge (200), and a bushing (301). The base is mounted on the container body and has a door hinge lug (100) with a post hole. The door hinge (200) is mounted on the container door and has a pin (202). When the door hinge (200) is assembled, the pin (202) is inserted into the door hinge lug (100) and coaxially arranged with the post hole. The connecting shaft is inserted from top to bottom into the post hole and the post pin (202) to complete the assembly of the door hinge (200) and the door hinge lug (100); the bushing (301) is set in the post pin (202) and coaxial with the post pin (202), and its end is provided with a bushing protrusion (302). When assembled, the bushing protrusion (302) is located between the inner side of the door hinge lug (100) and the end of the post pin (202) to isolate the friction surface between the post pin (202) and the door hinge lug (100).

2. A container door hinge according to claim 1, characterized in that: The bushing (301) adopts an integral or split structure; when it is integral, the bushing protrusion (302) can be set only at the bottom end of the bushing (301), or one can be set at each end of the bushing (301); when it is split, a bushing (301) is assembled at each end of the pin (202), and a bushing protrusion (302) is set at the end of each bushing (301).

3. A container door hinge according to claim 1, characterized in that: The bushing (301) is made of a self-lubricating and rust-proof material.

4. A container door hinge according to claim 1, characterized in that: The connecting shaft and the column hole and the column pin (202) adopt a clearance fit or an interference fit to ensure rotational flexibility or connection stability.

5. A container door hinge according to claim 1, characterized in that: The hinge lug (100) consists of two parallel lugs with coaxially aligned pin holes on the two lugs and a pin (202) inserted into the gap between the two lugs.

6. A container door hinge according to claim 1, characterized in that: The bushing protrusion (302) is an annular flange structure with an outer diameter larger than that of the pin (202) and is in contact with the inner side of the door hinge (100) and the end of the pin (202).

7. A container door hinge according to claim 1, characterized in that: The door hinge (200) is fixedly connected to the box door by bolts, and the base is fixedly connected to the box body by bolts.

Images