Limiting rotating shaft, connecting structure and cabinet body

Abstract

The application provides a limiting rotating shaft, a connecting structure and a cabinet body. The limiting rotating shaft comprises a supporting shaft body, a limiting shaft body and a rotating shaft body which are coaxially connected in sequence. The supporting shaft body is provided with a shaft hole at the center of the end portion. The limiting shaft body is provided with at least one rigid limiting boss and at least one elastic anti-loosening boss on the outer periphery. The application integrates accurate positioning, reliable support, rigid-flexible cooperative limiting, high sealing performance and high universality, and can improve the overall performance, reliability and economy of the cabinet door system.

Description

Technical Field

[0001] This invention relates to the field of mechanical structure design and hardware accessories technology, specifically to a limiting pivot, a connecting structure, and a cabinet. Background Technology

[0002] Currently, the installation of cabinet doors in various types of cabinets (such as furniture cabinets, express delivery cabinets, and outdoor storage cabinets) commonly adopts a traditional through-hole type circular door hinge sleeve combined with a cylindrical pivot. While this structure is simple and low-cost, it has several technical drawbacks in practical applications:

[0003] First, poor assembly stability: The through-hole bushing and the rotating shaft have a clearance fit, lacking effective axial restraint and radial support, making them prone to shaking, misalignment, or even detachment after long-term use. Second, insufficient sealing performance: The bushing has a through-hole structure, which cannot prevent external moisture and dust from entering the cabinet. Especially in outdoor or high-humidity environments, this can easily lead to corrosion of internal electrical components and hinge rust, affecting equipment reliability and service life. Third, low positioning accuracy and low assembly efficiency: The lack of visual assembly guidance and angle restraint mechanisms, relying on manual experience for alignment, makes the installation process cumbersome, requires frequent re-adjustments, and assembly errors often exceed ±0.5mm, making it difficult to meet the accuracy and efficiency requirements of intelligent and mass production. Fourth, weak versatility and adaptability: Different cabinet doors have significant differences in weight, thickness, and sheet metal structure. Existing bushings require various gaskets, fasteners, and even custom brackets, resulting in a wide variety of materials, complex management, and difficult after-sales maintenance. Fifth, the overall cost is high: Although the cost per unit is low, the high rate of assembly defects, rework, failures caused by seal failures, and shortened lifespan of the whole machine significantly increase the costs of manpower, materials, and operation and maintenance throughout the entire life cycle.

[0004] Chinese patent CN222707839U discloses an IoT cabinet, which provides a door hinge structure, an adjustment code installed on the door, and an eccentric bushing to solve the problem of the door slipping off. However, its structure still has certain shortcomings in terms of sealing, assembly efficiency, assembly stability, and adaptability.

[0005] Therefore, a limiting pivot, connecting structure, and cabinet are needed to meet practical requirements. Summary of the Invention

[0006] The purpose of this invention is to provide a limiting pivot, a connecting structure, and a cabinet that integrates precise positioning, reliable support, rigid-flexible coordinating limiting, high sealing performance, and high versatility, thereby improving the overall performance, reliability, and economy of the cabinet door system.

[0007] To achieve the above objectives, the present invention provides a limiting pivot, a connecting structure, and a cabinet. The technical solution of the present invention is implemented as follows:

[0008] A limiting pivot shaft includes a support section shaft, a limiting section shaft, and a pivot shaft section shaft connected coaxially in sequence. A shaft hole is provided at the center of the end of the support section shaft. At least one rigid limiting boss and at least one elastic anti-loosening boss are provided on the outer periphery of the limiting section shaft.

[0009] Furthermore, the support section shaft, the limiting section shaft, and the rotating section shaft are configured as three stepped shafts.

[0010] Furthermore, the bottom of the shaft hole is sealed.

[0011] Furthermore, the rigid limiting boss is arranged circumferentially along the axis of the limiting segment.

[0012] Furthermore, in the axial direction, the length of the rigid limiting boss is less than or equal to the length of the limiting segment shaft.

[0013] Furthermore, the elastic anti-loosening boss is arranged circumferentially along the axis of the limiting segment and / or along the outer side of the rigid limiting boss.

[0014] Furthermore, the elastic anti-loosening boss is disposed at one end near the support section shaft, and in the axial direction, the length of the elastic anti-loosening boss is less than the length of the limiting section shaft.

[0015] Furthermore, the elastic anti-loosening boss is made of an elastic material.

[0016] Furthermore, a positioning mark is provided on the end face of the support section shaft to indicate the setting direction of the rigid limiting boss.

[0017] A connection structure including the aforementioned limiting pivot.

[0018] Furthermore, the connection structure also includes a door hinge, a door hinge sleeve, and a mounting base; the limiting pivot is fixed on the mounting base, the support section shaft is movably connected to the door hinge through the shaft hole, and the pivot section shaft is movably connected to the door hinge sleeve.

[0019] A cabinet comprising the aforementioned connection structure.

[0020] Compared with existing technologies, the limiting pivot, connecting structure, and cabinet described in this invention have the following advantages:

[0021] 1. Enhanced reliability thanks to the integrated anti-loosening and sealing structure. Reliable anti-loosening performance: The elastic anti-loosening boss, based on the material's springback characteristics, forms a controllable interference fit with the sheet metal mounting hole wall. After assembly, it continuously applies radial preload, effectively suppressing fretting wear and axial movement under vibration conditions, completely avoiding the slippage, abnormal noise, and failure risks caused by clearance fits in traditional bushings. Outstanding environmental protection capabilities: The blind-hole support section shaft replaces the traditional through-hole structure, and the three-stage stepped labyrinth sealing path formed by the limiting boss and the anti-loosening boss significantly improves barrier performance. Third-party testing shows that the entire unit has an IP54 waterproof rating and an IP65 dustproof rating, capable of long-term resistance to rain, dust accumulation, and high-humidity corrosion, meeting the stringent environmental requirements of outdoor cabinets.

[0022] 2. Improved Assembly Performance Through Positioning and Visual Alignment Design. Firstly, assembly efficiency is significantly improved. The dual spatial positioning markers formed by the limiting boss and the triangular directional groove enable intuitive identification and rapid self-alignment of the installation direction, drastically reducing manual trial assembly and repeated corrections. Actual assembly time is reduced by more than 60% compared to traditional through-hole bushings, meeting the cycle time requirements of automated production lines. Secondly, positioning accuracy is greatly improved. The limiting boss and the mounting slot employ a high-precision surface contact fit, effectively constraining the radial freedom of the rotating shaft. After assembly, the shaft center offset is ≤±0.1mm, ensuring the stability of the cabinet door's rotation center and providing structural protection for door gap uniformity, smooth opening and closing, and sealing.

[0023] 3. The versatility and economic advantages brought by the modular adjustable structure. Highly adaptable to various scenario requirements: Core parameters such as the diameter of the support section shaft, the length / diameter of the rotating shaft, and the height / width of the boss are all set as adjustable variables. A limited number of molds can cover various cabinet door load ranges and mainstream sheet metal cabinet thicknesses, eliminating the need for customized special parts and significantly reducing mold opening costs and inventory complexity. Combining structural reliability and manufacturing economy: Adopting an integrated cold forging + precision machining process eliminates the risk of accumulated tolerances and interface weakening introduced by welding, riveting, or multi-part assembly, greatly improving overall rigidity; at the same time, it eliminates auxiliary materials such as gaskets, screws, and locking adhesives, increasing material simplification, reducing manual assembly time, and lowering the overall cost throughout the entire life cycle. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the limiting rotating shaft described in Embodiment 1 of the present invention. Figure 1 ;

[0025] Figure 2 This is a schematic diagram of the limiting rotating shaft described in Embodiment 1 of the present invention. Figure 2 ;

[0026] Figure 3 This is a schematic diagram of the connection structure described in Embodiment 2 of the present invention;

[0027] Figure 4 This is a schematic diagram of the installation of the limiting rotating shaft according to Embodiment 2 of the present invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Support section shaft; 2. Limiting section shaft; 3. Rotating section shaft; 4. Mounting base; 5. Door hinge; 6. Door hinge sleeve; 7. Adjustment code; 10. Shaft hole; 11. Positioning mark; 12. Step surface; 20. Rigid limiting boss; 21. Elastic anti-loosening boss. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the described embodiments are only some, not all, of the embodiments of this invention. The specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0031] Example 1

[0032] This invention relates to a limiting pivot for connecting the doors of furniture, storage cabinets or smart devices, and more particularly to a structurally optimized limiting pivot that integrates support, positioning, rotation limiting and anti-loosening functions.

[0033] like Figure 1 and Figure 2 As shown, this embodiment provides a limiting shaft, including a support section shaft 1, a limiting section shaft 2, and a rotating shaft 3 connected coaxially in sequence. These three components form an integrated rigid shaft, manufactured using cold forging and precision turning processes to ensure coaxiality between sections ≤ Φ0.2mm and end face perpendicularity ≤ 0.1mm. The overall structure is compact and has high strength. The support section shaft 1, limiting section shaft 2, and rotating shaft 3 are arranged as a three-section stepped shaft, with the diameter of the support section shaft 1 being larger than the diameters of the limiting section shaft 2 and the rotating shaft 3.

[0034] The support section shaft 1 has a disc-shaped structure, serving as the load-bearing and installation base for the entire rotating shaft, ensuring the stability of the overall structure after assembly. The diameter of the support section shaft 1 is 20mm~50mm, and the thickness is 3mm~20mm.

[0035] A shaft hole 10 is provided at the center of the end of the support section shaft 1. The shaft hole 10 extends axially into the interior of the limiting section shaft 2, and the axial depth of the shaft hole 10 is greater than its diameter, with the bottom of the hole sealed. Preferably, the diameter of the shaft hole 10 is Φ5mm~20mm, and the depth is 5mm~30mm. The shaft hole 10 is used to install the door hinge 5 to movably support the upper cabinet door, and at the same time, it has a sealing effect to prevent external dust or liquid from entering the internal structure axially.

[0036] A positioning mark 11 is provided on the outer end face of the support section shaft 1. The positioning mark 11 is a triangular groove used to indicate the setting direction of the rigid limiting boss 20. It serves as a direction identification mark during assembly, facilitating quick and accurate completion of the installation operation. During the installation process, the operator can quickly determine the correct orientation of the limiting boss based on this mark, avoiding reverse installation that could lead to functional failure.

[0037] The limiting section shaft 2 is located between the supporting section shaft 1 and the rotating section shaft 3. Its outer circumferential surface is provided with at least one rigid limiting boss 20 and at least one elastic anti-loosening boss 21. The multiple rigid limiting bosses 20 and the elastic anti-loosening bosses 21 are staggered in the circumferential direction by an angle of 30° to 150° to avoid stress concentration and enhance the reliability of the limiting-anti-loosening synergy. Figure 1 As shown, a rigid limiting boss 20 and three elastic anti-loosening bosses 21 are provided, arranged in a staggered manner at 90° intervals.

[0038] The rigid limiting boss 20 is a protrusion arranged circumferentially along the limiting section shaft 2, with a rectangular or trapezoidal cross-section. Axially, the length of the rigid limiting boss 20 is less than or equal to the length of the limiting section shaft 2. Preferably, the axial height of the rigid limiting boss 20 is 0.5mm~10.0mm, the radial protrusion is 1.0mm~15.0mm, and the circumferential width is 1.0mm~10.0mm, continuously distributed circumferentially, for embedding into corresponding mounting slots to achieve precise positioning, effectively restricting the rotational freedom of the shaft itself, and ensuring transmission stability.

[0039] The elastic anti-loosening boss 21 is an elastic protrusion arranged circumferentially along the limiting section shaft 2. The elastic anti-loosening boss 21 is made of elastic material or an elastic movable mechanical structure. When using an elastic material, the elastic anti-loosening boss 21 has no relative movement with the limiting section shaft 2; elasticity is achieved through material deformation, such as a rubber boss or a spring steel sheet stamping. An elastic movable mechanical structure refers to a kinematic pair containing movable parts, hinges / sliding / rotation, etc., such as a swing arm spring or a ball bearing clamping mechanism. Preferably, the elastic anti-loosening boss 21 is made of polyurethane elastic material coated on the surface of a metal substrate. Its outer diameter in the free state is 0.05mm~0.5mm larger than the inner diameter of the mounting hole, resulting in an interference fit after assembly, forming a clamping force, effectively preventing axial loosening or disengagement of the shaft due to vibration or load changes during long-term use. The elastic anti-loosening boss 21 is located near one end of the supporting section shaft 1; axially, the length of the elastic anti-loosening boss 21 is less than the length of the limiting section shaft 2. The interference fit design between the elastic anti-loosening boss 21 and the sheet metal part generates a continuous and stable tightening force after assembly, ensuring a firm connection between the shaft and the installation position. This completely solves the industry pain point of traditional door hinge sleeves 6 being prone to slippage during assembly and loosening during use, ensuring long-term stable operation of the product. Simultaneously, the continuously set elastic anti-loosening bosses 21 continuously apply radial preload under the pressed-in state, maintaining a gapless fit between the limiting section shaft 2 and the mounting hole wall of the mounting base 4, thus achieving a radial seal.

[0040] The pivot section shaft 3 is a smooth cylinder with a rust-proof treatment and precision grinding to ensure that the surface roughness meets the standards. The pivot section shaft 3 is fixedly fitted with the cabinet door, transmission shaft, and shelves to ensure smooth and stable opening and closing movements, while also possessing good wear resistance and corrosion resistance. Preferably, the pivot section shaft 3 has a length of 10mm~80mm, a diameter of Φ3mm~20mm, a tolerance grade of h6, a surface roughness Ra≤0.6μm, and is treated with nickel-phosphorus alloy plating, exhibiting good wear resistance and corrosion resistance. The end of the pivot section shaft 3 has a C1×45° or R0.2~R0.5 arc transition 31 to prevent scratching the inner wall of the cabinet or the edge of the cabinet door during assembly.

[0041] The shaft hole 10, together with the rigid limiting boss 20 and the elastic anti-loosening boss 21, constitutes a three-stage sealing structure. The shaft hole 10 prevents axial dust and moisture from entering; the rigid limiting boss 20 and the mounting groove form the first radial seal; the elastic anti-loosening boss 21 and the mounting hole wall form the second interference squeeze seal, and the whole machine achieves an IP54 or IP65 protection level.

[0042] A stepped surface 12 is provided between the supporting shaft 1 and the limiting shaft 2. The stepped surface 12 is a precision-machined plane with a flatness of ≤0.05mm. On the one hand, the stepped surface 12 serves as an installation reference surface to ensure the contact accuracy between the rotating shaft and the surface of the cabinet mounting base 4, thereby improving the overall assembly consistency and stability. On the other hand, the stepped surface 12 fits snugly against the surface of the mounting base 4, forming a sealing barrier to prevent external moisture from seeping in axially.

[0043] No gaskets, spring washers, or additional fasteners are required between the support shaft 1 and the mounting base 4 of the cabinet. Tool-free quick installation is achieved solely through the mechanical engagement and elastic clamping of the limiting shaft 2 with the preset slot.

[0044] In summary, the limiting pivot provided in this embodiment integrates support, limiting, anti-loosening, sealing and directional guidance functions into one integrated design. It has a compact structure, is easy to install and has high reliability, and is particularly suitable for door connection systems that require high-precision positioning and long-term stable operation.

[0045] The hinge is used in the door hinge structure of furniture cabinets, smart express cabinets, outdoor storage cabinets or medical equipment cabinets, replacing the traditional through-hole round door hinge sleeve 6, realizing five functions of single-axis integrated positioning, support, limit, sealing and anti-loosening.

[0046] Example 2

[0047] This embodiment provides a modular limiting pivot connection structure suitable for smart cabinets, furniture cabinet doors and outdoor storage equipment. It integrates the limiting pivot as in Embodiment 1 with the matching door pivot assembly, mounting base 4 and adjustment mechanism in a high-precision and multi-functional manner, realizing the integration of functions such as rotation support, angle limiting, axial anti-loosening, direction guidance and waterproof sealing.

[0048] The connecting structure includes a limiting pivot, a door hinge 5, a door hinge sleeve 6, an adjusting bracket 7, and a mounting base 4. Through multi-stage mechanical coordination, it achieves functions such as rotational support, angle limiting, axial anti-loosening, position adjustment, and directional guidance for the cabinet door.

[0049] One end of the door hinge 5 is inserted into the shaft hole 10 on the support section shaft 1 and forms a sliding fit with the shaft hole 10; the other end of the door hinge 5 is connected to the adjusting code 7. The door hinge 5 is connected to the cabinet door through the adjusting code 7 to realize the rotation and opening of the cabinet door.

[0050] The pivot section 3 is inserted into the central through hole of the door hinge sleeve 6, with a clearance fit between the two to ensure that the cabinet door can rotate freely around the pivot section 3. The door hinge sleeve 6 has a metal part with a raised portion on its outer circumference, which is interference-fitted with the corresponding slot on the cabinet door to secure it. The end of the pivot section 3 has a rounded transition to prevent scratching the inner wall of the door hinge 5 during assembly.

[0051] The mounting base 4 is a long strip-shaped metal guide rail or sheet metal part, mounted on the cabinet. The mounting base 4 has slots whose shape corresponds to the cross-sectional shape of the limiting section shaft 2 of the limiting pivot, enabling proper installation. A rigid limiting boss 20 is embedded in the corresponding mounting slot on the mounting base 4 for positioning and fixation; an elastic anti-loosening boss 21 forms an interference fit with the inner wall of the mounting hole in the mounting base 4, generating continuous clamping force. The limiting section shaft 2 of the limiting pivot passes through the mounting base 4, causing the supporting section shaft 1 to fit tightly against the slot of the mounting base 4, forming a stable support and fixing the entire pivot assembly to the mounting base 4. The stepped surface 12 is in contact with the surface of the mounting base 4, forming a sealing barrier.

[0052] The adjustment bracket 7 consists of two vertically connected surfaces, A and B, both of which are elongated strips. Surface A has multiple through holes for mounting and connection to the cabinet door. Screws secure the adjustment bracket 7 to the cabinet door through these through holes. Surface B has multiple through holes for connection to the door hinge 5. The door hinge 5 connects the adjustment bracket 7 to the limiting pivot through one of the through holes. By selecting different mounting positions on surfaces A and B, the installation position of the cabinet door can be adjusted, thus overcoming issues such as door sagging or gaps between cabinet doors. The adjustment bracket 7 also features positioning marks to indicate the installation direction and ensure consistent assembly.

[0053] The connection structure is centered on a limiting pivot mounted on the mounting base 4. One end supports the bottom edge of the upper cabinet door, while the other end limits the top edge of the lower cabinet door, allowing adjacent cabinet doors to rotate around the same axis. This significantly improves load distribution and reduces stress concentration at single points. When arranged symmetrically as a set, it effectively constrains out-of-plane deformation of the cabinet doors and synergistically enhances the torsional stiffness of the cabinet frame, thereby suppressing cabinet door sagging, warping, and cabinet deformation.

[0054] The specific assembly process for the connection structure is as follows:

[0055] S1, Orientation Alignment and Preliminary Positioning. Insert the shaft section 3 of the limiting shaft axially into the pre-drilled mounting hole of the mounting base 4; using the triangular groove positioning mark 11 set on the end face of the support section shaft 1 as a visual reference, align the positioning mark 11 with the preset direction marking line or the opening direction of the limiting slot on the mounting base 4, and insert the limiting section shaft 2 in this direction, so that the rigid limiting boss 20 is embedded in the corresponding limiting slot on the mounting base 4, thus completing the positioning of the circumferential angle of the shaft.

[0056] S2, elastic press-fit fixing. Uniform pressure is applied axially to the end face of the support section shaft 1, causing the elastic anti-loosening boss 21 on the limiting section shaft 2 to undergo controllable elastic compression deformation. Its outer diameter changes from a free state to a compressed state, thus forming a tight fit with the inner wall of the mounting hole in the mounting base 4. This process achieves axial limiting and radial self-locking of the shaft on the mounting base 4 without the need for screws, rivets, adhesives, or other external fasteners.

[0057] S3, Door hinge 5 docking and final assembly. Align the door hinge 5, pre-installed on the lower end face of the cabinet door, with the shaft hole 10 in the center of the support section shaft 1, and smoothly push it in axially until the door hinge 5 is fully embedded in the shaft hole 10 of the support section shaft 1, forming a clearance fit, thus completing the assembly with the upper cabinet door. Align the door hinge sleeve 6, pre-installed on the upper end face of the cabinet door, with the through hole of the rotating shaft section 3, and smoothly push it in axially until the rotating shaft section 3 is fully embedded in the center through hole of the door hinge sleeve 6, forming a clearance fit, thus completing the assembly with the lower cabinet door.

[0058] This connection structure features an IP54-level protection structure achieved through an axial-radial coordinated sealing mechanism, specifically including:

[0059] Axial sealing structure: The support section shaft 1 has a shaft hole 10 at its center. Its bottom surface is closed, the hole wall is smooth, and the surface roughness Ra≤0.8μm. When the door shaft 5 is inserted, its outer cylindrical surface forms a surface contact seal with the inner wall of the shaft hole 10, effectively blocking the intrusion of droplets and dust along the axial direction.

[0060] Radial sealing structure: The elastic anti-loosening boss 21 continuously applies radial preload under the pressed-in state, ensuring a gapless fit between the limiting section shaft 2 and the mounting hole wall of the mounting base 4. After the rigid limiting boss 20 is embedded in the slot, its two sides form a mechanical interference seal with the side wall of the slot. The stepped surface 12 fits against the edge of the mounting base 4, forming a sealing barrier to prevent external moisture from seeping in axially. Therefore, the rigid limiting boss 20, the elastic anti-loosening boss 21, and the mounting hole fit in all directions, forming a radial seal. This double sealing structure blocks water and dust from flowing into the cabinet through the installation gaps, ensuring the cabinet interior is dry and clean.

[0061] The two sealing structures work together to provide reliable protection for the cabinet's interior space without relying on additional sealing rings, adhesive layers, or coating processes. The waterproof rating reaches IP54 or higher, and the dustproof rating reaches IP65 or higher. This effectively prevents rainwater, dust, moisture, and other impurities from intruding, extending the lifespan of the door hinges and the cabinet, and making it suitable for use in complex outdoor environments.

[0062] The present invention also provides a cabinet, which includes the connection structure described above.

[0063] This invention is applicable to the assembly of various furniture cabinets, express delivery cabinets, filing cabinets, outdoor storage cabinets, equipment cabinet doors, and other products using sheet metal structures. Key parameters such as the diameter of the support section shaft 1 (20-50mm), the length of the pivot section shaft 3 (30-80mm), and the size of the boss can be flexibly adjusted according to parameters such as the cabinet door weight (5-50kg), length (500-2000mm), and thickness to meet the personalized assembly needs of different products, making it widely applicable.

[0064] It should be noted that all terms used in this invention to indicate direction and position, such as "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "inner", "outer", "top", "lower", "tail end", "head end", "center", etc., are only used to explain the relative positional relationship and connection between components in a specific state. They are only for the convenience of describing this invention and do not require that this invention must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0065] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0066] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A limiting pivot, characterized in that, The limiting shaft includes a support section shaft (1), a limiting section shaft (2) and a rotating shaft section shaft (3) connected coaxially in sequence. A shaft hole (10) is provided at the center of the end of the support section shaft (1). At least one rigid limiting boss (20) and at least one elastic anti-loosening boss (21) are provided on the outer periphery of the limiting section shaft (2).

2. The limiting rotating shaft according to claim 1, characterized in that, The support section shaft (1), the limiting section shaft (2), and the rotating shaft section shaft (3) are configured as three stepped shafts.

3. The limiting rotating shaft according to claim 1, characterized in that, The bottom of the shaft hole (10) is sealed.

4. The limiting rotating shaft according to claim 1, characterized in that, The rigid limiting boss (20) is arranged circumferentially along the axis of the limiting segment (2).

5. The limiting rotating shaft according to claim 4, characterized in that, In the axial direction, the length of the rigid limiting boss (20) is less than or equal to the length of the limiting section shaft (2).

6. The limiting rotating shaft according to claim 1, characterized in that, The elastic anti-loosening boss (21) is arranged along the circumference of the limiting section shaft (2) and / or along the outer side of the rigid limiting boss (20).

7. The limiting rotating shaft according to claim 6, characterized in that, The elastic anti-loosening boss (21) is located at one end near the support section shaft (1); in the axial direction, the length of the elastic anti-loosening boss (21) is less than the length of the limiting section shaft (2).

8. The limiting rotating shaft according to claim 1, characterized in that, The elastic anti-loosening boss (21) is made of elastic material.

9. The limiting rotating shaft according to claim 1, characterized in that, The end face of the support section shaft (1) is provided with a positioning mark (11) for pointing to the setting direction of the rigid limiting boss (20).

10. A connection structure, characterized in that, The connection structure includes the limiting pivot as described in any one of claims 1 to 9.

11. The connection structure according to claim 10, characterized in that, The connection structure also includes a door hinge (5), a door hinge sleeve (6), and a mounting base (4); the limiting rotating shaft is fixed on the mounting base (4), the supporting section shaft (1) is movably connected to the door hinge (5) through the shaft hole (10), and the rotating shaft section shaft (3) is movably connected to the door hinge sleeve (6).

12. A cabinet, characterized in that, The cabinet includes the connection structure described in claim 10 or 11.

Images