Chassis and wheeled vehicle

Abstract

The application discloses a chassis and a wheeled carrier. The chassis comprises a bottom beam connector, a bottom beam and a limiting assembly. The bottom beam is rotationally connected with the bottom beam connector. The limiting assembly is movably connected with the bottom beam connector. The chassis has a locked state and an unlocked state. In the locked state, the limiting assembly limits the rotation of the bottom beam relative to the bottom beam connector. In the unlocked state, the limiting assembly is separated from the bottom beam, and the bottom beam can rotate relative to the bottom beam connector. The chassis has the advantages of high stability locking and flexible folding adjustment in the same structure, and significantly improves the adaptability and use reliability of the wheeled carrier in multiple scene working conditions.

Description

Technical Field

[0001] This application relates to the technical field of chassis, and more particularly to a chassis and wheeled vehicle. Background Technology

[0002] Wheeled vehicles are widely used in logistics handling, mobile robots, special equipment and service robots. Their chassis structure not only bears the weight of the whole vehicle and the external load, but also needs to ensure the vehicle's posture stability and path tracking accuracy under dynamic conditions such as driving, turning and obstacle crossing.

[0003] In existing technologies, common chassis often employ a fixed rigid frame or a simplified folding mechanism with a single rotating joint. The former relies on an integral welded or bolted frame to provide high rigidity, but its external dimensions are fixed, making it difficult to quickly fold and adjust its posture in scenarios such as narrow passages, loading and unloading, and multi-platform compatibility. The latter, although introducing a rotatable connection to obtain a certain folding capability, generally lacks a reliable limiting / locking mechanism to match it. In actual use, problems such as insecure locking, relative swaying under load, and increased gaps due to motion impact are prone to occur, which in turn lead to reliability risks such as vehicle posture deviation, increased driving vibration, stress concentration at the connection, and shortened fatigue life. Utility Model Content

[0004] One objective of this application is to provide a chassis and wheeled vehicle, proposing a chassis structure consisting of a bottom beam connector, a rotatable bottom beam, and a limiting component that selectively cooperates with it. By switching between locking and unlocking modes, precise "allow-prohibit" control of the relative rotation of the bottom beam is achieved, which helps to complete the synchronous folding with the linkage relationship with the surrounding vertical beams. This aims to solve the technical contradiction between the difficulty of folding traditional rigid chassis and the insufficient locking reliability of simple folding mechanisms.

[0005] To achieve the above objectives, a first aspect of this application provides a chassis for a wheeled vehicle, comprising:

[0006] The chassis includes a bottom beam connector, a bottom beam, and a limiting assembly. The bottom beam is rotatably connected to the bottom beam connector; the limiting assembly is movably connected to the bottom beam connector. The chassis has a locked state and an unlocked state. In the locked state, the limiting assembly restricts the rotation of the bottom beam relative to the bottom beam connector. In the unlocked state, the limiting assembly is separated from the bottom beam, and the bottom beam can rotate relative to the bottom beam connector.

[0007] Optionally, the limiting component is slidably connected to the bottom beam connector.

[0008] Optionally, the bottom beam connector has a groove, the bottom beam is inserted into the groove and rotatably connected to the bottom beam connector, and the limiting component is slidably connected to the bottom beam connector along the groove. In the locked state, the limiting component abuts against the bottom beam to restrict the rotation of the bottom beam.

[0009] Optionally, the limiting component includes a slider and a first reset member. The slider is slidably connected to the bottom beam connector along the slide groove, and the first reset member is connected to both the slider and the bottom beam connector. The first reset member is used to drive the slider to maintain a locked state.

[0010] Optionally, the slider has a limiting groove and a notch communicating with the limiting groove, the first reset member is assembled in the limiting groove and is opposite to the notch, and the bottom beam connector protrudes to form a column, which is opposite to the notch.

[0011] Optionally, in the vertical direction, the end of the slider near the opening of the groove is provided with a first chamfer, which is used to guide the bottom beam to rotate between the slider and the bottom beam connector.

[0012] Optionally, the slider is provided with:

[0013] A space is provided for the rope to pass through; and

[0014] A horizontal bar spans across the accommodating space.

[0015] Optionally, there are at least two bottom beams, which are arranged in a radiating pattern on the bottom beam connector. In the unlocked state, the at least two bottom beams retract towards each other, and in the locked state, the at least two bottom beams extend away from each other.

[0016] Optionally, two adjacent bottom beams are symmetrical to each other, and there are two limiting components, each limiting component cooperating with every two bottom beams; or, there are four limiting components, each limiting component cooperating with each bottom beam; when changing from the locked state to the unlocked state, the two or four limiting components move closer to each other.

[0017] Optionally, the chassis also includes pull ropes, which are connected to two or four limit assemblies respectively;

[0018] The pull cord includes a locking section, a cross section, and a lifting section. The locking section is connected to two or four limit components, the cross section is connected to two or four locking sections to form an intersection point, and the lifting section is connected to the cross section.

[0019] Optionally, the bottom beam connector includes a main body and at least two limiting parts. The main body has a sliding groove, and the limiting components are slidably connected to the bottom beam connector along the sliding groove. The at least two limiting parts are spaced apart around the main body. The limiting parts have a rotating groove communicating with the sliding groove. The bottom beam passes through the rotating groove and is inserted into the sliding groove, and the bottom beam is rotatably connected to the limiting parts.

[0020] Optionally, there are at least two rotating slots, wherein the included angle between the extending directions of the two rotating slots is α, and 120°≤α≤170°.

[0021] Optionally, the bottom beam includes a main beam and a blocking assembly. The main beam is rotatably connected to the bottom beam connector, and the blocking assembly is slidably connected to the main beam along its axial direction. The blocking assembly is used to elastically move and resist the limiting assembly in the locked state to restrict the rotation of the bottom beam.

[0022] Optionally, the blocking assembly includes a pin and a second reset member, which is connected to the pin and the main beam respectively. The pin is slidably connected to the main beam along its axial direction. The second reset member is used to drive the pin to elastically move and resist the limiting assembly when switching from the unlocked state to the locked state, so as to limit the rotation of the bottom beam.

[0023] Optionally, the bottom beam also includes a pivot shaft, which is connected to the bottom beam connector. The main beam is rotatably connected to the bottom beam connector via the pivot shaft. The pin has a buffer groove, and the pivot shaft is inserted into the buffer groove.

[0024] Optionally, the bottom beam also includes an auxiliary beam, which is rotatably connected to the bottom beam connector, and the auxiliary beam is parallel to and spaced apart from the main beam.

[0025] Optionally, the bottom beam also includes a connecting member, which is rotatably connected to the main beam and the auxiliary beam respectively. In the locked state, the connecting member abuts against the side of the main beam away from the auxiliary beam.

[0026] A second aspect of this application provides a wheeled vehicle, comprising:

[0027] The circumferential vertical beam and the chassis provided in the first aspect are rotatably connected to the end of the bottom beam away from the bottom beam connector; and the wheeled vehicle is foldable when the chassis is in the unlocked state.

[0028] The beneficial effects of this application are as follows: This technical solution addresses the technical contradiction that traditional chassis structures struggle to simultaneously provide high rigidity and stable support while allowing for retractable and adjustable vehicle body shapes. It proposes a solution through a limiting component that enables "controllable locking / unlocking rotation." In conditions requiring structural rigidity, load-bearing stability, and posture maintenance, the chassis is placed in a locked state, with the limiting component reliably limiting the bottom beam. This effectively prevents relative rotation of the bottom beam during vehicle movement, resolving issues such as posture deviation, increased vibration, and stress concentration at connections caused by relative displacement. This results in improved chassis stability, enhanced load-bearing reliability, and improved durability. In conditions requiring a smaller vehicle body shape or adjustments to assembly / passability, switching to the unlocked state allows the bottom beam to rotate relative to the bottom beam connector, driving the peripheral vertical beams towards the bottom beam connector. This solves the pain points of traditional rigid frames, which struggle to quickly retract and adapt to narrow passages or transportation loading limitations. This achieves convenient vehicle body retraction, controllable dimensions, and adaptability to complex environments and transportation requirements. Thus, the chassis achieves a balance between high-stability locking and flexible retraction adjustment within the same structure, significantly improving the adaptability and reliability of wheeled vehicles in various operating conditions. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the wheeled vehicle provided in the embodiment of this application in the locked state;

[0031] Figure 2 This is a schematic diagram of the wheeled vehicle provided in the embodiment of this application in the unlocked state;

[0032] Figure 3 This is a schematic diagram of the chassis in the locked state provided in the embodiments of this application;

[0033] Figure 4 This is a schematic diagram of the chassis in the unlocked state provided in the embodiments of this application;

[0034] Figure 5 This is a schematic diagram of the structure of the limiting component supporting the bottom beam provided in the embodiment of this application;

[0035] Figure 6 This is a schematic diagram of the limiting component and bottom beam connector provided in the embodiments of this application in the locked state;

[0036] Figure 7 This is a schematic diagram of the slider provided in an embodiment of this application;

[0037] Figure 8 This is a structural schematic diagram of the bottom beam connector provided in the embodiments of this application.

[0038] Explanation of icon numbers:

[0039] Wheeled vehicle 001, peripheral vertical beam 200, chassis 100, bottom beam connector 120, main body 121;

[0040] Limiting part 122, bridging part 123, slide 124, column 125, rotating groove 126, bottom beam 110;

[0041] Main beam 111, blocking assembly 112, rotating shaft 113, auxiliary beam 114, connecting piece 115, pin 116;

[0042] Second reset component 117, buffer groove 118, second chamfer 119, limit component 130, slider 131;

[0043] First reset component 132, insert 133, limiting groove 134, notch 135, first chamfer 136;

[0044] 137. Accommodation space; 139. Horizontal bar; 140. Pull rope; 141. Locking section; 142. Cross section; 143. Lifting section. Detailed Implementation

[0045] The embodiments of this application will be described in detail below with reference to the accompanying drawings, clearly and comprehensively demonstrating the technical solutions. It should be noted that the listed embodiments are only a part of this application, and not all possible implementations. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0046] Please see Figures 1 to 5 As shown, Figure 1 This is a schematic diagram of the wheeled vehicle 001 provided in the embodiment of this application in the locked state. Figure 2 This is a schematic diagram of the wheeled vehicle 001 provided in the embodiment of this application in the unlocked state. Figure 3 This is a schematic diagram of the chassis 100 in the locked state according to an embodiment of this application. Figure 4 This is a schematic diagram of the chassis 100 in the unlocked state according to an embodiment of this application. Figure 5 This is a schematic diagram of the structure of the limiting component 130 supporting the bottom beam 110 provided in the embodiment of this application.

[0047] One embodiment of this application provides a chassis 100 structure for a wheeled vehicle 001. The wheeled vehicle 001 includes peripheral vertical beams 200 as a three-dimensional frame and a chassis 100 as a load-bearing and motion adjustment unit. The chassis 100 is composed of a bottom beam connector 120, a bottom beam 110, and a limiting component 130. The bottom beam 110 and the bottom beam connector 120 are rotatably connected (e.g., hinged or bearing-type rotating pair), allowing the bottom beam 110 to rotate relative to the bottom beam connector 120 when permitted. The limiting component 130 is movably connected to the bottom beam connector 120, and can selectively engage or disengage with the bottom beam 110 as needed. For ease of understanding, the bottom beam connector 120 can be considered as a base fixed to the chassis frame, the bottom beam 110 as a rotating component that can swing relative to the base, and the limiting component 130 as a locking mechanism that controls whether the rotating component is locked. The peripheral vertical beam 200 is rotatably connected to the end of the bottom beam 110 away from the bottom beam connector 120. The chassis has two working states: locked and unlocked. In the locked state, the limiting component 130 and the bottom beam 110 achieve a reliable limiting engagement, preventing any rotation of the bottom beam 110 relative to the bottom beam connector 120. Even if the wheeled vehicle 001 is in a dynamic working state such as driving, turning, or overcoming obstacles, the bottom beam 110 remains locked and stationary. In the unlocked state, the limiting component 130 separates from the bottom beam 110, releasing the restriction on the bottom beam. The bottom beam 110 can then rotate relative to the bottom beam connector 120. Through the transmission or linkage relationship with the peripheral vertical beam 200, it drives the peripheral vertical beam 200 to move towards the bottom beam connector 120, thereby achieving a synchronous retraction effect of the peripheral vertical beam, which facilitates the vehicle to shrink its outline or adjust its posture when needed.

[0048] In some embodiments, the specific implementation of the movable connection between the limiting component 130 and the bottom beam connector 120 can be: 1. Sliding connection, that is, the limiting component 130 and the bottom beam connector 120 can slide relative to each other; 2. Rotational connection, that is, the limiting component 130 and the bottom beam connector 120 can rotate relative to each other, etc.

[0049] This technical solution addresses the technical contradiction of traditional chassis structures simultaneously achieving high rigidity and stable support while allowing for retractable and adjustable vehicle body shapes. It proposes a solution through a limiting component 130 that enables "controllable locking / unlocking rotation." In conditions requiring structural rigidity, load-bearing stability, and posture maintenance, the chassis is placed in a locked state, with the limiting component 130 reliably limiting the bottom beam 110. This effectively prevents relative rotation of the bottom beam during vehicle movement, resolving issues such as posture deviation, increased vibration, and stress concentration at connections caused by relative displacement. This results in improved chassis stability, enhanced load-bearing reliability, and improved durability. In conditions requiring a smaller vehicle body shape or adjustments for assembly / passability, the chassis is switched to an unlocked state, allowing the bottom beam 110 to rotate relative to the bottom beam connector 120. This drives the peripheral vertical beams 200 towards the bottom beam connector 120, resolving the limitations of traditional rigid frames in terms of rapid retraction and adaptation to narrow passages or transportation loading restrictions. This achieves convenient vehicle body retraction, controllable dimensions, and adaptability to complex environments and transportation requirements. Thus, the chassis 100 achieves a balance between high-stability locking and flexible retraction adjustment within the same structure, significantly improving the adaptability and reliability of the wheeled vehicle 001 in various working conditions.

[0050] In some embodiments, the limiting component 130 may be slidably connected to the bottom beam connector 120.

[0051] Specifically, the bottom beam connector 120 has a sliding groove 124; one end of the bottom beam 110 is inserted into the sliding groove 124 and is rotatably connected to the bottom beam connector 120, allowing the bottom beam 110 to rotate relative to the bottom beam connector 120. A limiting component 130 is disposed within the sliding groove 124 and can slide along the extension direction of the sliding groove 124 with the bottom beam connector 120. The peripheral vertical beam 200 is rotatably connected to the end of the bottom beam 110 away from the bottom beam connector 120. Figure 1-4 In the embodiment shown, the wheeled vehicle 001 has four peripheral vertical beams 200, and the chassis 100 correspondingly includes four bottom beams 110; the four bottom beams 100 are rotatably connected at one end to the bottom beam connector 120 in a radial manner, and at the other end to the corresponding peripheral vertical beams 200.

[0052] The limiting component 130 has two working states: a locked state and an unlocked state. In the locked state, the limiting component 130 can abut against the bottom beam 110, restricting the rotation of the bottom beam 110 and ensuring that the bottom beam 110 and the peripheral vertical beams 200 connected to it maintain a stable unfolded state. In the unlocked state, the limiting component 130 separates from the bottom beam 110, releasing the limiting effect on the bottom beam 110. At this time, the bottom beam 110 can rotate freely around the bottom beam connector 120, thereby driving the peripheral vertical beams 200 to gradually move towards the bottom beam connector 120, realizing the folding or collapsing of the wheeled vehicle 001.

[0053] This technical solution solves the technical problems of inconvenient folding and storage, insufficient stability after unfolding, and complex structure of the existing wheeled vehicle chassis 100 and peripheral vertical beam 200 connection structure. By designing a sliding groove 124 on the bottom beam connector 120 and setting a sliding limiting component 130, the user can slide the limiting component 130 to lock or unlock the bottom beam 110, realizing rapid transformation of the chassis 100 structure, significantly simplifying the operation steps, and improving the convenience and efficiency of operation. The cooperation structure between the limiting component 130 and the bottom beam 110 is simple, with fewer parts, reducing production and maintenance costs, while improving the reliability of the structure. During the deployment of the vehicle, the limiting component 130 is in a locked state, effectively preventing the bottom beam 110 from rotating unexpectedly and ensuring the stability of the chassis 100 and the peripheral vertical beams 200, as well as the safety of the vehicle. When folding or collapsing is required, the limiting component 130 switches to an unlocked state, allowing the bottom beam 110 to rotate and drive the peripheral vertical beams 200 to close, greatly reducing the vehicle's volume, facilitating handling and storage, and improving space utilization. In summary, this technical solution, through the synergistic effect of the sliding groove 124 and the sliding limiting component 130, simplifies the structure and enhances the function of the wheeled vehicle 001 chassis 100, effectively improving the vehicle's practicality and safety, and achieving the technical effects of simple structure, convenient operation, and stable reliability.

[0054] Of course, the slidable connection between the limiting component 130 and the bottom beam connector 120 can also be achieved by setting a slider and a slide rail between the limiting component 130 and the bottom beam connector 120, or by setting a cylindrical guide shaft and a linear bearing between the limiting component 130 and the bottom beam connector 120.

[0055] The number of bottom beams 110 is at least two, and the at least two bottom beams 110 are arranged in a radiating pattern on the bottom beam connector 120. In the unlocked state, the at least two bottom beams 110 retract towards each other, and in the locked state, the at least two bottom beams 110 extend away from each other. A chassis locking structure with multiple bottom beams 110 arranged in a radiating pattern is provided, with the bottom beam connector 120 serving as a central base, and at least two bottom beams 110 installed at intervals along its circumference, so that each bottom beam 110 extends outward from the center in a radial / scattering pattern. Each bottom beam 110 is connected to the bottom beam connector 120 via a hinge or sliding hinge mechanism to achieve a swingable / extendable connection, enabling multiple bottom beams 110 to retract or expand simultaneously under the same operating action: when in the unlocked state, the drive unit drives at least two bottom beams 110 to retract towards each other, and the outer ends of at least two bottom beams 110 form multi-point circumferential support and clamping limit with the limiting component; when in the locked state, at least two bottom beams 110 expand away from each other, and the outer ends disengage from the limiting component.

[0056] This embodiment addresses the technical problems of insufficient chassis stability, uneven locking, and cumbersome unlocking procedures caused by traditional single bottom beams 110 or limited support. It employs a radiating arrangement of at least two bottom beams 110 with coordinated retraction / expansion: On one hand, in the unlocked state, at least two bottom beams 110 retract circumferentially to form multi-point circumferential clamping and radial limiting, significantly improving the overall anti-overturning and anti-vibration capabilities of the chassis, distributing loads and suppressing relative rotation or movement, thus improving the operational stability and sealing reliability of the equipment under high-frequency vibration conditions. On the other hand, in the locked state, multiple bottom beams 110 simultaneously expand outwards, quickly releasing the clamping constraints, providing greater operating clearance, reducing the difficulty and time cost of manual disassembly and assembly, and avoiding scratches and wear caused by localized jamming. Through consistent synchronous transmission and end-position limit design, the system can achieve fast, visible, and repeatable locking / unlocking switching without relying on highly experienced operators. This solves the pain points of poor locking, low maintenance efficiency, and high risk of contamination, thereby achieving the technical effects of improving chassis stability, shortening maintenance cycle time, extending the life of related components, and reducing maintenance and downtime costs.

[0057] Please see Figures 1 to 6 As shown, Figure 6 This is a schematic diagram of the limiting component 130 and the bottom beam connector 120 provided in the embodiments of this application in the locked state.

[0058] Some embodiments of this disclosure relate to a limiting assembly 130 structure for a wheeled vehicle chassis 100. The limiting assembly 130 includes a slider 131 and a first reset member 132, wherein the slider 131 is slidably connected to a bottom beam connector 120 along a groove 124. Specifically, the bottom beam connector 120 has a groove 124, and the slider 131 can slide relative to the bottom beam connector 120 within the groove 124. The first reset member 132 is connected between the slider 131 and the bottom beam connector 120, and may be an elastic element such as a spring or elastic sheet. The function of the first reset member 132 is to drive the slider 131 to always remain in the locked state. That is, when the slider 131 is not pushed / pulled by an external force, the first reset member 132 automatically resets the slider 131 to a position that can support the bottom beam 110, thereby limiting the bottom beam 110. When unlocking is required, the user can push / pull the slider 131 with an external force to overcome the elastic effect of the first reset member 132, thereby leaving the locked position, separating the slider 131 from the bottom beam 110, and thus releasing the rotation restriction of the bottom beam 110.

[0059] This technical solution solves the problems of cumbersome operation and insufficient reliability of the limiting component 130 in the prior art by setting up a slider 131 and a first reset component 132. The introduction of the first reset component 132 enables the slider 131 to automatically return to the locked position without manual positioning, greatly simplifying the user's operation process and improving ease of use. When the vehicle needs to be kept in the unfolded state, the first reset component 132 automatically pushes the slider 131 to hold the bottom beam 110, preventing the bottom beam 110 from rotating unexpectedly and ensuring the stability and safety of the structure. When the vehicle needs to be folded or retracted, the user pushes / pulls the slider 131 to slide it in the groove 124, and unlocks it by moving it away from the locked position. The operation is flexible and efficient. This structure not only has simple components and low manufacturing cost, but also high reliability, and can effectively prevent structural loosening or safety hazards caused by limiting failure. In summary, this technical solution achieves automatic reset and efficient limiting of the limiting component 130 through the cooperation of the slider 131 and the first reset component 132, thereby improving the safety, stability and ease of use of the wheeled vehicle chassis 100 structure and achieving the effects of structural optimization and technical improvement.

[0060] Please see Figures 1 to 7 As shown, Figure 7 This is a schematic diagram of the slider 131 provided in the embodiment of this application.

[0061] Some embodiments of this disclosure provide a limiting assembly 130 structure for a wheeled vehicle chassis 100. This structure includes a slider 131 and a first reset member 132. The slider 131 has a limiting groove 134 and a notch 135 communicating with the limiting groove 134. The first reset member 132 is fitted into the limiting groove 134 and opposite to the notch 135, and is always located within the limiting groove 134. Simultaneously, the bottom beam connector 120 has a protrusion, specifically a post 125, which is positioned opposite to the notch 135 on the slider 131. In practical applications, the slider 131 and the bottom beam connector 120 are slidably connected along the groove 124. The first reset member 132 can be an elastic element such as a spring or an elastic sheet. In the locked state, the slider 131 remains in its original position under the action of the first reset member 132, thus limiting the bottom beam 110. When unlocking is required, the user pushes / pulls the slider 131, causing the post 125 on the bottom beam connector 120 to pass through the notch 135 of the slider 131. The post 125 enters the limiting groove 134 and abuts against and compresses the first reset member 132. During this process, the first reset member 132 remains within the limiting groove 134 and is compressed as the post 125 enters, thus temporarily unlocking the slider 131. When the external force is removed, the first reset member 132 regains its elasticity, automatically pushing the slider 131 back to its original position and re-locking it.

[0062] This technical solution achieves automatic reset and efficient limiting of the limiting component 130 by using a slider 131 with a limiting groove 134 and a notch 135, a column 125 formed by the bottom beam connector 120 facing the notch 135, and a first reset component 132 assembled in the limiting groove 134. This structure effectively solves the technical problems of inconvenient reset, insufficient limiting reliability, and cumbersome operation of the limiting component 130 in the prior art. First, the cooperative design of the column 125 with the notch 135 and the limiting groove 134 makes the unlocking operation more convenient. When the user pushes / pulls the slider 131, the column 125 can pass through the notch 135 and compress the first reset component 132, bringing a more intuitive and efficient operating experience. Second, the first reset component 132 is always located in the limiting groove 134. Whether in the locked or unlocked state, it can ensure that the slider 131 can automatically reset and return to the locked state after the external force is removed, thereby improving the reliability of the limiting and avoiding structural loosening or safety hazards caused by human negligence. Furthermore, this structure, through the high integration of the slider 131, limiting groove 134, notch 135, column 125, and reset component, achieves structural compactness and ease of assembly, reduces the number of parts, and lowers manufacturing and maintenance costs. In summary, some embodiments of this disclosure, through structural innovation, effectively improve the safety, stability, and ease of use of the wheeled vehicle chassis 100, achieving the goals of structural optimization and technological advancement.

[0063] Some embodiments of this disclosure provide an improved slider 131 structure for enhancing the guiding and assembly efficiency between the bottom beam 110 and the slider 131. Specifically, as Figure 4 As shown, in the vertical direction, the top of the slider 131 has an opening of a groove 124, which allows the slider 131 to be assembled into the groove 124. A first chamfer 136 is provided at the end of the slider 131 near the opening of the groove 124; that is, the end of the slider 131 away from the bottom of the groove 124 has a first chamfer 136. This first chamfer 136 can be either a rounded corner or a beveled corner. In actual use, the slider 131 is first assembled into the groove 124 with the bottom beam connector 120. When the structure is in the unlocked state, the bottom beam 110 can rotate relative to the slider 131. When it is necessary to change from the unlocked state to the locked state, the bottom beam 110 rotates towards the slider 131 under the action of external force. At this time, the end of the bottom beam 110 will contact the end of the slider 131 away from the bottom of the groove. Because this end has a first chamfer 136, both rounded and beveled corner structures can provide smooth guidance for the rotation of the bottom beam 110. Specifically, during the rotation of the bottom beam 110, the first chamfer 136 effectively guides the end of the bottom beam 110 to gradually slide between the slider 131 and the bottom beam connector 120, thereby smoothly completing the engagement between the bottom beam 110 and the slider 131 and achieving locking.

[0064] Through the above technical solution, a first chamfer 136 is provided at the end of the slider 131 away from the bottom of the groove 124, effectively solving the problem of jamming or positioning difficulties that easily occur during the rotational assembly of the bottom beam 110 in traditional structures. Whether the first chamfer 136 is rounded or beveled, it provides a smooth guide path for the end of the bottom beam 110 during rotation, reducing resistance and friction during assembly. This allows the bottom beam 110 to enter more smoothly between the slider 131 and the bottom beam connector 120, preventing interference and damage between parts. This design optimizes the connection process between the bottom beam 110 and the slider 131, improving the assembly efficiency and reliability of the structure and reducing the risk of assembly errors. Simultaneously, the improved guiding effect helps extend the service life of parts, further enhancing the durability and safety of the overall structure. In summary, some embodiments of this disclosure, by providing a first chamfer 136 at the end of the slider 131, achieve smooth guidance during the rotational assembly of the bottom beam 110, effectively solving technical problems such as jamming and inconvenient assembly, and achieving the technical effect of improving assembly efficiency and reliability.

[0065] Some embodiments of this disclosure provide an easy-to-operate slider 131 structure. The slider 131 is provided with a receiving space 137 for a lifting rope to pass through and a crossbar 139 spanning the receiving space 137. Specifically, the receiving space has a first opening and a second opening formed on adjacent side walls of the slider 131, which communicate to form the receiving space 137. The crossbar 139 is formed between the first and second openings. In some embodiments, the crossbar 139 is located on the edge line where the adjacent side walls of the slider 131 with the first and second openings intersect. In practical applications, when the slider 131 is locked within the slide groove 124 or related structure, the user inserts a finger or tool (such as a lifting rope) through the interconnected first and second openings into the receiving space 137, and by pulling the crossbar 139, the slider 131 can be directly moved along the slide groove 124. When it is necessary to switch from the locked state to the unlocked state, the user can easily change the position of the slider 131 by moving the crossbar, thus achieving the unlocking operation. This structure simplifies the operation of slider 131, allowing users to lock and unlock with less effort and in a more convenient way.

[0066] The above technical solution solves the technical problems of inconvenient operation, insufficient force points when pushing / pulling, and poor user experience of traditional slider 131 structures by opening a first and second interconnected opening on the adjacent side walls of the slider 131, thereby forming an accommodating space 137 for tools such as fingers or pull ropes to enter, and setting a crossbar 139 between the first and second openings. Specifically, the interconnected slot structure provides operating space, and the crossbar serves as a clearly defined force-bearing point, enabling users to accurately and easily push / pull the slider 131 within a limited space. Compared with the traditional structure with an operating point on one side, this solution significantly improves the operability and ergonomics of the slider 131, reducing jamming and strenuous operation. At the same time, the crossbar structure enhances the structural strength of the slider 131, preventing damage or deformation of the slider 131 due to unilateral force, and improving the overall durability and safety of the structure. Therefore, some embodiments of this disclosure innovatively design connecting grooves on both sides of the slider 131 and set crossbars 139, thereby achieving the convenience and reliability of slider 131 operation, significantly improving user experience and the practical value of the structure, and achieving the technical effect of optimizing the operation mode of slider 131 and improving structural performance.

[0067] Some embodiments of this disclosure also provide a structurally optimized limiting component 130. The limiting component 130 includes a slider 131 and an insert 133. The slider 131 is made of plastic material, possessing good processing performance and lightweight characteristics. To enhance the strength of the slider 131 at critical stress points, a metal insert 133 is provided inside the slider 131, and the metal insert 133 is enclosed within the slider 131 during the molding process. The insert 133 is specifically positioned inside the slider 131 at a location corresponding to the bottom beam 110, i.e., the area where the slider 131 directly contacts and bears stress with the bottom beam 110. This structure ensures that when the limiting component 130 is in operation, the contact portion between the slider 131 and the bottom beam 110 is reinforced by the embedded metal insert 133, effectively bearing the pressure and friction from the bottom beam 110 and preventing deformation or damage to the slider 131 during use.

[0068] This technical solution effectively solves the technical problem of traditional plastic sliders 131 easily deforming or wearing under stress during long-term contact with the bottom beam 110, leading to a decrease in limiting performance, by encasing a metal insert 133 inside the plastic slider 131 and placing the insert 133 at the stress-bearing parts corresponding to the slider 131 and the bottom beam 110. The addition of the metal insert 133 significantly enhances the local strength and wear resistance of the contact area between the slider 131 and the bottom beam 110, enabling it to withstand higher loads and repeated friction, and preventing deformation of the slider 131 due to uneven stress or insufficient strength. Meanwhile, the slider 131 as a whole is still made of plastic, ensuring the lightweight structure and cost advantage of the limiting component 130. In summary, this technical solution, through an innovative combination of structure and materials, balances the overall lightweight and low cost of the slider 131 with the high strength and durability of key components, achieving the technical effect of long-term reliable operation of the limiting component 130 and reduced maintenance costs.

[0069] Please see Figure 3 This disclosure presents a structural design for the cooperation of a base beam 110 with a limiting component 130. The structure includes four base beams 110, symmetrically distributed in pairs to form a stable frame structure. Two limiting components 130 are provided, each cooperating with two of the base beams 110, meaning each limiting component 130 can simultaneously act on its corresponding two base beams 110. In the locked state, the two limiting components 130 are located at opposite ends of the slide groove 124, spaced apart from each other. This arrangement effectively restricts the movement of the four base beams 110, ensuring that the base beams 110 are in a predetermined unfolded position, thereby guaranteeing the stability of the entire structure. When the structure needs to switch from the locked state to the unlocked state, the two limiting components 130 are pushed to move towards each other along the slide groove 124, gradually approaching each other, and the limiting constraints at the ends of the base beams 110 are gradually released. As the limiting component 130 moves, the four bottom beams 110 can move synchronously towards the center, thereby driving the four peripheral vertical beams 200 to retract together, realizing the overall folding or shrinking function of the structure.

[0070] Of course, based on this, four limiting components 130 can also be set, each limiting component 130 cooperating with one of the bottom beams 110, that is, each limiting component 130 can act on its corresponding bottom beam 110. In the locked state, the four limiting components 130 are located at the four corners of the slide 124 and are radiating and spaced apart from each other. This arrangement can effectively restrict the movement of the four bottom beams 110 respectively, ensuring that the bottom beams 110 are in the predetermined unfolded position, thereby ensuring the stability of the entire structure. When the structure needs to switch from the locked state to the unlocked state, the four limiting components 130 are pushed to move towards each other. As the four limiting components 130 gradually approach each other, the limiting constraints at the ends of the bottom beams 110 are gradually released. With the movement of the limiting components 130, the four bottom beams 110 can move synchronously towards the center, thereby driving the four peripheral vertical beams 200 to retract together, realizing the overall folding or shrinking function of the structure.

[0071] This technical solution solves the technical problems of inconvenient locking and unlocking operations and poor structural stability of the bottom beams 110 in existing structures by setting up four adjacent symmetrical bottom beams 110 and two or four movable limiting components 130, with each limiting component 130 cooperating with the corresponding two or one bottom beam 110. On the one hand, the two or four limiting components 130 are located at both ends or four corners of the slide groove 124, and in the locked state, they can simultaneously limit the four bottom beams 110, effectively preventing accidental movement of the bottom beams 110 and improving the overall stability of the structure in the unfolded state. On the other hand, when the structure needs to be folded or retracted, operating the two or four limiting components 130 to move towards the center simultaneously releases the limiting of the four bottom beams 110, allowing them to retract synchronously towards the center, achieving efficient and convenient operation of unlocking the bottom beams 110 and folding the structure. Furthermore, the symmetrical distribution of the bottom beams 110 and the paired cooperation of the limiting components 130 ensure uniform force distribution and balanced movement during unfolding and retracting, reducing the risk of jamming and deformation, and significantly improving the durability and service life of the structure. Therefore, this technical solution, through the reasonable design of the bottom beam 110 and the limiting component 130, achieves high stability of the structure in the locked state and efficient synchronous folding in the unlocked state, significantly improving the practicality and reliability of the structure.

[0072] Of course, in other embodiments, a limiting component 130 may also be provided, which cooperates with the four bottom beams 110 respectively. In the locked state, one limiting component 130 cooperates with all four bottom beams 110 simultaneously. When changing from the locked state to the unlocked state, one limiting component 130 moves away from the four bottom beams 110 until it separates from the four bottom beams 110, thereby unlocking the bottom beams 110.

[0073] Some embodiments of this disclosure relate to an improved structure of a chassis 100, wherein the two ends of a pull rope 140 are connected to two or four limiting components 130, respectively. The limiting components 130 are typically disposed inside a groove 124 of the chassis 100 and are used to cooperate with a bottom beam 110 to lock and unlock the chassis 100. The pull rope 140 passes through the interior or surface of the limiting components 130 and can move the limiting components 130 during user operation. When the user needs to switch the chassis 100 from the locked state to the unlocked state, they manually pull the pull rope 140 located in the center of the chassis 100. During the pulling process, the pull rope 140 applies a pulling force to the two or four limiting components 130, causing the two or four limiting components 130 to automatically move closer to each other along the groove 124, achieving opposite movement. With this structural design, users can easily operate two or four limiting components 130 at the same time to release the limiting constraints on the bottom beam 110, allowing the chassis 100 structure to smoothly switch from the locked state to the unlocked or folded state.

[0074] This technical solution effectively solves the problems of existing technologies where the limit components 130 need to be manually operated separately, the operation steps are cumbersome, and the synchronization is poor. By setting a pull rope 140 on the chassis 100 and connecting the pull rope 140 to two or four limit components 130 respectively, the solution addresses these issues. Through the linkage mechanism of a single pull rope 140, the user can simultaneously move two or four limit components 130 towards the center by pulling the rope 140 with one hand, thus synchronously releasing the limit on the bottom beam 110. This greatly simplifies the operation process and improves convenience and efficiency. Furthermore, the automatic driving method ensures that the two or four limit components 130 move synchronously, avoiding technical problems such as asynchronous movement of the limit components 130 and incomplete unlocking caused by manual operation, thus improving the reliability of the chassis 100 unlocking process. In summary, this technical solution achieves efficient, convenient, and synchronous control of the limit components 130 of the chassis 100, significantly improving the user experience and the practicality of the chassis 100 structure.

[0075] Some embodiments of this disclosure relate to an improved chassis 100 unlocking structure, characterized in that the pull rope 140 structure includes a locking section 141, a crossing section 142, and a lifting section 143. Specifically, the locking sections 141 are fixedly connected to two or four limiting components 130 of the chassis 100, respectively. When there are two limiting components 130, there are two locking sections 141; when there are four limiting components 130, there are four locking sections 141. The two or four locking sections 141 are connected to the crossing section 142, forming an intersection point in space. One end of the lifting section 143 is connected to the intersection point of the crossing section 142, and the other end is provided with a handle or pull ring for easy gripping and force application by the user. The pull rope 140 is arranged along the interior of the limiting components 130, ensuring that each segment of the pull rope 140 can move smoothly without tangling or jamming. When the user needs to release the chassis 100 from its locked state, they manually pull the lifting section 143 upwards. The lifting section 143 applies a pulling force to the intersection of the cross section 142, which then distributes the pulling force equally to at least two or four locking sections 141. Under the action of the pulling force, the at least two or four locking sections 141 simultaneously drive their respective connected limiting components 130 to move towards the center along the slide groove 124, achieving synchronous unlocking.

[0076] This technical solution optimizes the structure of the pull rope 140, designing it to include a locking section 141, a cross section 142, and a lifting section 143, with the cross point serving as the force distribution center. This effectively solves the technical problems of insufficient force transmission and the inability of the limiting components 130 to unlock synchronously when the length of the pull rope 140 increases. Specifically, by setting the cross point, when the lifting section 143 is pulled, the pulling force acts directly on the distance from the cross point to the locking section 141, forming a suitable torque. This ensures that even if the pull rope 140 is longer, the driving force acting on the two or four limiting components 130 remains sufficient, preventing the limiting components 130 from moving poorly or failing to unlock due to the increased length of the pull rope 140. Simultaneously, the cross structure ensures even force distribution, allowing the two or four limiting components 130 to move synchronously, greatly improving the reliability and convenience of the unlocking operation. In summary, this technical solution effectively optimizes the mechanical structure of the pull rope 140, ensures efficient and synchronous unlocking of the chassis 100 limiting component 130, and improves the practicality of the chassis 100 structure and user experience.

[0077] Please see Figures 1 to 8 As shown, Figure 8 This is a structural schematic diagram of the bottom beam connector 120 provided in the embodiments of this application.

[0078] Some embodiments of this disclosure provide a bottom beam connector 120 structure, which includes a main body 121 and at least two limiting parts 122. The main body 121 serves as the main load-bearing structure of the connector and has a sliding groove 124 extending along its length. At least two limiting parts 122 are arranged around the main body 121 at intervals, and each limiting part 122 has a rotating groove 126 communicating with the sliding groove 124 of the main body 121. In actual assembly, the bottom beam 110 passes through the rotating grooves 126 of each limiting part 122 in sequence and is inserted into the sliding groove 124 of the main body 121, while simultaneously achieving a rotatable connection with the limiting part 122 at the rotating groove 126 of the limiting part 122. With this structural design, when the bottom beam 110 is subjected to external force, it can rotate around the rotating groove 126 at a certain angle relative to the limiting part 122. This not only ensures the range of motion of the bottom beam 110, but also effectively limits and guides the bottom beam 110, preventing the bottom beam 110 from falling off or shaking.

[0079] This technical solution provides a sliding groove 124 in the main body 121 and a rotating groove 126 communicating with the sliding groove 124 on at least two spaced limiting parts 122, so that the bottom beam 110 can pass through the rotating groove 126 and be inserted into the sliding groove 124, while forming a rotating connection with the limiting part 122. This effectively solves the technical problems of poor stability of the bottom beam 110 connection structure, unreliable limiting, and limited movement in the prior art. Specifically, the spaced, surrounding design of the limiting part 122 provides multi-point limiting for the bottom beam 110, significantly improving the stability of the connection structure and preventing axial and radial swaying of the bottom beam 110. The connection between the rotating groove 126 and the sliding groove 124 allows the bottom beam 110 to move not only in the sliding groove 124 but also to rotate in the limiting part 122, enhancing the flexibility and applicability of the connection structure. The rotating connection between the bottom beam 110 and the limiting part 122 effectively reduces wear between the bottom beam 110 and the connecting parts, extending the service life of the components. Furthermore, this structure facilitates the assembly and disassembly of the bottom beam 110, improving production and subsequent maintenance efficiency. In summary, this technical solution, through optimization of the bottom beam connecting part 120 structure, achieves reliable limiting and flexible connection of the bottom beam 110, improves the overall structural stability and durability, and enhances the convenience of assembly and use, ultimately achieving the technical effect of reliable structure and smooth movement.

[0080] Some embodiments of this disclosure relate to a structure for the directional unfolding and closing of multiple peripheral vertical beams 200 based on a limiting component 130. The number of rotating slots 126 is at least two, and the included angle between the extending directions of the two rotating slots 126 is α°, where 120 ≤ α ≤ 170. Specifically, the explanation focuses on a structure with two limiting components 130. Each limiting component 130 can simultaneously limit two bottom beams 110, which are rotatably connected to two rotating slots 126 respectively. The other end of each bottom beam 110 is connected to a peripheral vertical beam 200; therefore, the four bottom beams 110 are connected to four peripheral vertical beams 200 respectively. Through this structural design, the four bottom beams 110 can rotate along the extending direction of their respective rotating slots 126 under the action of the limiting part 122, thereby causing the four connected peripheral vertical beams 200 to unfold or close as needed. When the structure needs to be unfolded, the bottom beam 110 rotates within the rotating groove 126, causing the vertical beams to extend outward in an orderly manner according to the set angle, forming a stable support structure. When the structure needs to be retracted, the bottom beam 110 rotates in the opposite direction, and the vertical beams move inward in sequence, achieving compact storage of the structure. Guided by the rotating groove 126 and limited by the angle α, the entire unfolding or retracting process is smooth and orderly, with no interference between the vertical beams, and the spatial layout of the structure can be flexibly adjusted according to actual needs.

[0081] This technical solution addresses the technical problems of limited unfolding angle, unsmooth movement, and easy collision interference between vertical beams in existing multi-beam structures by setting at least two rotating grooves 126 with included angles of 120° to 170° on the bottom beam connector 120, and rotatably connecting them to at least two bottom beams 110 respectively. First, the set included angle α brings greater flexibility and adaptability to the spatial distribution of the structure, allowing for a wider coverage angle when unfolded and a compact design when retracted. Second, the limiting and guiding function of the rotating grooves 126 ensures smooth and stable movement of the bottom beams 110 and the surrounding vertical beams 200, avoiding misalignment or mutual interference between the surrounding vertical beams 200, thus improving the usability of the structure and the convenience of user operation. Finally, while ensuring flexible structural transformation, this solution enhances overall stability and safety, making it widely applicable to structural scenarios requiring the directional unfolding and retraction of multiple surrounding vertical beams 200. Therefore, some embodiments of this disclosure achieve the technical effects of flexible structural adjustment, smooth movement and stable positioning, significantly improving the practical value and market competitiveness of the overall assembly.

[0082] Some embodiments of this disclosure relate to a structural improvement of a bottom beam connector 120. A groove 124 extending along the length of the main body 121 is provided, which guides the installation and movement of the limiting component 130. At least two limiting portions 122 are provided along the length of the groove 124, which can directionally limit and precisely position the bottom beam 110, preventing the bottom beam 110 from shifting or falling off within the groove 124. To further improve the overall strength and structural stability of the bottom beam connector 120, some embodiments of this disclosure provide a bridging portion 123 between every two adjacent limiting portions 122 along the length of the groove 124, connecting the limiting portions 122 to form a structurally integrated whole. As a connecting element, the bridging part 123 can effectively support and constrain each limiting part 122, preventing deformation or damage to a single limiting part 122 due to uneven stress. At the same time, the bridging part 123 simplifies the overall structure of the bottom beam connector 120, which is beneficial for subsequent assembly and processing.

[0083] Some embodiments of this disclosure solve the technical problems in the prior art, such as the dispersed structure of the bottom beam connector 120, the easy deformation or damage of the limiting parts 122 due to uneven stress, and insufficient overall strength, by providing at least two bridging portions 123 on the bottom beam connector 120 and connecting adjacent limiting parts 122 along the length direction of the slide groove 124 through the bridging portions 123. First, the addition of the bridging portions 123 enhances the connection between the limiting parts 122, enabling each limiting part 122 to support each other and share the load. When the bottom beam 110 is subjected to external force, the limiting parts 122 can jointly bear and disperse the stress through the bridging portions 123, thereby improving the service life and safety of the bottom beam connector 120. Second, the presence of the bridging portions 123 organically combines the originally dispersed limiting parts 122, significantly improving the overall rigidity and stability of the bottom beam connector 120 and preventing structural failure problems such as loosening and displacement of the limiting parts 122 during long-term use. Furthermore, this integrated structural design facilitates the mass production and assembly of the bottom beam connector 120, reducing manufacturing costs and improving production efficiency. In summary, this technical solution, through the bridging portion 123, enhances the structural strength and stability of the bottom beam connector 120, achieving reliable limiting and positioning of the bottom beam 110, thereby significantly improving the practicality and durability of the bottom beam connector 120 and meeting the high strength and high reliability requirements of practical applications.

[0084] Please see Figure 4 and Figure 5Some embodiments of this disclosure provide an improved bottom beam 110 structure, including a main beam 111 and a blocking assembly 112. The main beam 111 is rotatably connected to the bottom beam connector 120, allowing the main beam 111 to rotate freely relative to the bottom beam connector 120 within a certain angular range. The end of the main beam 111 away from the bottom beam connector 120 is rotatably connected to a peripheral vertical beam 200. The blocking assembly 112 is slidably connected to the main beam 111 along its axial direction, meaning the blocking assembly 112 can move along the length of the main beam 111. When it is necessary to restrict the rotation of the main beam 111, the blocking assembly 112 can be elastically inserted into the groove 124 of the bottom beam connector 120 and abut against the limiting assembly 130 disposed in the groove 124. With the above structure, the blocking component 112 does not affect the rotation of the main beam 111 when it is not inserted. After being inserted into the sliding groove 124 and abutting against the limiting component 130, it can effectively restrict the rotation of the main beam 111, thereby achieving reliable positioning of the bottom beam 110. The elastic insertion design of the blocking component 112 makes it more convenient to install and disassemble, and it can automatically adapt to slide between the limiting component 130 and the bottom beam connector 120, ensuring the structural tightness and ease of operation.

[0085] This technical solution, through the rotational connection between the main beam 111 and the bottom beam connector 120, gives the bottom beam 110 structure greater flexibility, meeting the needs for rotational adjustment of the bottom beam 110 in practical applications. However, to prevent accidental movement of the main beam 111 when rotation is not required, a blocking component 112 with elastic insertion function is provided, sliding along the axis of the main beam 111. The blocking component 112 can be inserted into the slide groove 124 under elastic action and firmly resisted by the limiting component 130, thereby effectively restricting the rotation of the main beam 111. This design solves the technical problems of inconvenient rotational locking, unreliable positioning, and easy loosening in traditional bottom beam 110 structures. Through elastic insertion, the blocking component 112 can quickly and firmly cooperate with the limiting component 130, improving the ease of operation and locking reliability of the structure. At the same time, this structure does not require complex fasteners or tools, facilitating user assembly and maintenance, and reducing manufacturing and maintenance costs. In summary, some embodiments of this disclosure, through the rotational connection between the main beam 111 and the bottom beam connector 120 and the elastic insertion design of the blocking component 112, enable the bottom beam 110 to rotate flexibly when needed and lock reliably under specific working conditions, significantly improving the safety, ease of operation, and durability of the bottom beam 110 structure, and achieving the technical effects of structural stability, reliable positioning, and efficient maintenance.

[0086] Some embodiments of this disclosure provide an assembly structure for a main beam 111 and a blocking component 112. The main beam 111 is a hollow structure with a through cavity formed in its axial direction. The blocking component 112 is designed to be assembled within this cavity and can slide or be positioned within the cavity as needed. The hollow cavity structure of the main beam 111 not only provides space for the embedding of the blocking component 112 but also facilitates the concealment and protection of the blocking component 112 within the main beam 111. By placing the blocking component 112 within the cavity of the main beam 111, the blocking component 112 is effectively prevented from being exposed to the outside, reducing the impact of the external environment and lowering the risk of damage caused by external impacts. Furthermore, the cooperation between the blocking component 112 and the cavity can be achieved through sliding, locking, or elastic limiting structures, depending on specific functional requirements, to ensure precise positioning and reliable operation of the blocking component 112 within the cavity.

[0087] This technical solution addresses the problems of complex installation, susceptibility to external interference, and inconvenient maintenance associated with traditional external connections between the main beam 111 and the blocking component 112 by designing the main beam 111 as hollow and incorporating axial channels within these channels. The blocking component 112, concealed within the main beam 111, significantly improves the overall structural compactness and aesthetics, while effectively preventing the impact of external collisions, dust, moisture, and other environmental factors on the blocking component 112, thus enhancing the device's durability and reliability. Furthermore, the assembly and movement of the blocking component 112 within the channels are more convenient, enabling rapid positioning and replacement and reducing maintenance costs. In summary, this technical solution achieves higher integration between the main beam 111 and the blocking component 112, resulting in a simpler and more compact structure. It enhances the protection of the blocking component 112 and the overall durability of the main beam 111, while also improving assembly and maintenance efficiency, thus achieving optimized structure, reliable function, and ease of use.

[0088] Some embodiments of this disclosure disclose a bottom beam locking structure, wherein the blocking component 112 includes a pin 116 and a second reset member 117. The pin 116 is slidably connected to the main beam 111 along the axial direction of the main beam 111, and the pin 116 can move back and forth within the cavity. The second reset member 117 can be an elastic element (such as a spring), one end of which is fixedly connected to the pin 116, and the other end is connected to the main beam 111. During installation, the pin 116 can be placed in the cavity of the main beam 111, and the second reset member 117 remains in an elastically compressed state. When it is necessary to restrict the rotation of the bottom beam 110, the pin 116 slides along the axial direction of the main beam 111 under the driving action of the second reset member 117, inserts into the groove 124 on the bottom beam connector 120, and abuts against the limiting component 130 provided at the end of the groove 124, thereby effectively limiting the rotation of the main beam 111. This structure allows the blocking component 112 to complete the insertion and reset actions inside the main beam 111, and the structure is compact and easy to operate.

[0089] This technical solution solves the technical problems of inconvenient pin 116 reset, unreliable positioning, and complex operation in existing bottom beam locking structures by setting a pin 116 and a second reset component 117 in the blocking component 112, and connecting the second reset component 117 to both the pin 116 and the main beam 111. Specifically, the second reset component 117 can automatically drive the pin 116 to move without manual adjustment, improving ease of operation and automation. When the pin 116 is inserted into the slide groove 124 under the elastic action of the second reset component 117 and abuts against the limiting component 130, it can effectively restrict the rotation of the bottom beam 110, ensuring the stability and safety of the bottom beam 110 structure in the locking state. This solution simplifies the installation and reset process of the pin 116, reduces user operation steps, and improves the reliability and durability of the structure. In summary, through the cooperation of the pin 116 and the second reset member 117, some embodiments of this disclosure achieve flexible locking and rapid reset of the bottom beam 110 structure, achieving the technical effects of simple operation, reliable locking, and high structural integration.

[0090] Some embodiments of this disclosure disclose an improved bottom beam 110 structure. Specifically, the bottom beam 110 includes a rotating shaft 113, which is connected to a bottom beam connector 120. The bottom beam connector 120 and the main beam 111 are rotatably connected via the rotating shaft 113, allowing the main beam 111 to rotate relative to the bottom beam connector 120. In the blocking assembly 112, a buffer groove 118 is formed on the pin 116. The buffer groove 118 can be an elongated groove along the length of the pin 116. The rotating shaft 113 passes through the buffer groove 118, achieving a guide sliding connection between the pin 116 and the main beam 111. The pin 116 can slide axially within the cavity of the main beam 111. Its range of motion is limited by the cooperation of the buffer groove 118 and the rotating shaft 113, meaning the pin 116 can move within the allowable length range of the buffer groove 118. When it is necessary to lock the relative rotation between the main beam 111 and the bottom beam connector 120, the pin 116 slides under the action of the drive mechanism (such as a spring) and inserts into the groove 124 on the bottom beam connector 120, abutting against the limiting component 130, thus reliably limiting the rotation between the main beam 111 and the bottom beam connector 120. When it is necessary to release the lock, the pin 116 slides in the opposite direction, and the groove walls at both ends of the buffer groove 118 abut against the rotating shaft 113, preventing the pin 116 from exceeding its stroke or dislodging from the cavity of the main beam 111, thereby ensuring the normal working position of the pin 116.

[0091] This technical solution effectively limits the range of motion of the pin 116 by setting a buffer groove 118 on the pin 116 and allowing the rotating shaft 113 to pass through the buffer groove 118, thus solving the technical problem of the pin 116 easily slipping excessively or even falling out in the prior art. The rotating shaft 113 not only undertakes the function of rotation between the main beam 111 and the bottom beam 110, but also, through cooperation with the buffer groove 118, achieves physical limitation on the sliding limit of the pin 116, ensuring that the pin 116 is always in a controlled state during operation. This structural design improves the safety and reliability of the locking mechanism of the limiting component 130, preventing locking failure or structural damage caused by abnormal position of the pin 116. At the same time, the multi-functional integration of the rotating shaft 113 simplifies the number of parts, improves the compactness of the structure and assembly efficiency, and enhances the overall performance of the product. Through the above-mentioned structural innovations, some embodiments of this disclosure can effectively realize the flexible rotation and reliable locking of the main beam 111 and the bottom beam connector 120, greatly improving the ease of operation, service life and safety performance of the bottom beam 110, and achieving the technical effects of high structural integration, precise locking and safe operation.

[0092] Some embodiments of this disclosure relate to an improved pin 116 structure for a locking device between the main beam 111 and the bottom beam 110. Specifically, in the structural design of the pin 116, a second chamfer 119 is provided at the end of the pin 116 facing the bottom of the groove 124. This second chamfer 119 can be a rounded corner structure or a beveled corner structure. Regardless of the form, the second chamfer 119 is located at the end of the pin 116 that contacts the bottom of the groove 124. The pin 116 can move freely in the unlocked state. When it is necessary to switch the pin 116 from the unlocked state to the locked state, the pin 116 rotates towards the groove 124 under the action of external force. During this process, the second chamfer 119 can play a guiding role when the pin 116 approaches the limiting component 130, making the end of the pin 116 more smoothly inserted between the limiting component 130 and the bottom beam connector 120, and less prone to jamming. Especially in cases where there are minor assembly deviations or unsatisfactory operating angles, the second chamfer 119 can effectively guide the pin 116 to be inserted into the predetermined position along the correct trajectory, thereby achieving smooth rotation and precise positioning of the pin 116.

[0093] This technical solution provides an effective structural optimization by setting a second chamfer 119 (including a rounded corner or a beveled corner) at the end of the pin 116 facing the bottom of the groove 124. This addresses the technical difficulties such as end jamming and uneven insertion during the insertion of the pin 116. The second chamfer 119 automatically guides the end of the pin 116 smoothly into the space between the limiting component 130 and the bottom beam connector 120 when the pin 116 changes from the unlocked to the locked state, reducing resistance during insertion and minimizing the risk of interference or damage due to assembly tolerances or operational errors. Whether a rounded corner or a beveled corner is used, it improves the smoothness of contact between the end of the pin 116 and the mating part, enhancing the smoothness of the pin 116's rotation and insertion. Therefore, this technical solution not only simplifies the locking operation and improves the product's assembly tolerance but also effectively enhances the reliability and service life of the locking device, achieving a simple structure, smooth operation, and safe locking effect.

[0094] Some embodiments of this disclosure provide an improved bottom beam 110 structure, particularly suitable for applications of wheeled vehicles 001 in scenarios such as opening, closing, or structural adjustment. The bottom beam 110 structure also includes an auxiliary beam 114, wherein both the main beam 111 and the auxiliary beam 114 are rotatably connected at one end to the bottom beam connector 120, and rotatably connected at the other end to the peripheral vertical beams 200, with the auxiliary beam 114 and the main beam 111 arranged parallel to each other and spaced apart. The bottom beam connector 120, the main beam 111, the peripheral vertical beams 200, and the auxiliary beam 114 together constitute a parallel four-bar linkage. In practical applications, the peripheral vertical beams 200 need to move closer to or further away from the bottom beam connector 120 according to the operational requirements of the wheeled vehicle 001. Thanks to the arrangement of the main beam 111 and the auxiliary beam 114, they work together during movement as guiding components connecting the bottom beam connector 120 and the peripheral vertical beams 200. When the position of the peripheral vertical beam 200 needs to be adjusted, the main beam 111 and the auxiliary beam 114 can jointly drive the peripheral vertical beam 200 to rotate smoothly and synchronously around the rotation point of the bottom beam connector 120, thereby ensuring that the peripheral vertical beam 200 always moves along the controlled trajectory. Compared with relying solely on the movement of the main beam 111, this structure significantly avoids problems such as swaying, jamming, or positional deviation that may occur in the peripheral vertical beam 200 during movement, improving the overall structure's motion accuracy and stability.

[0095] Through the implementation of the above technical solution, the main beam 111 and auxiliary beam 114 in the bottom beam 110 structure are arranged in parallel and spaced intervals, forming a parallel four-bar linkage together with the bottom beam connector 120 and the peripheral vertical beams 200. This effectively solves the technical problems in the prior art where the peripheral vertical beams 200 are prone to swaying, jamming, and positional displacement when moving with the main beam 111. The synergistic effect of the four-bar linkage allows the main beam 111 and auxiliary beam 114 to jointly guide and constrain the movement trajectory of the peripheral vertical beams 200 during rotation, achieving synchronous and stable movement of the peripheral vertical beams 200 around the bottom beam connector 120. This not only significantly improves the accuracy and stability of the structure during movement but also enhances the reliability and service life of the entire wheeled vehicle 001 structure. In summary, this technical solution, through optimized structural design, achieves stability and synchronization in the adjustment of the 200° position of the circumferential vertical beams, significantly reducing the risk of instability during structural movement, and improving the precision and efficiency of structural adjustment and operation. This results in smooth movement, accurate positioning, and reliable use, bringing greater safety and convenience to the practical application of related equipment.

[0096] In some embodiments, an improved bottom beam 110 structure is provided. Based on the original four-bar linkage consisting of a main beam 111, an auxiliary beam 114, a bottom beam connector 120, and peripheral vertical beams 200, a connecting member 115 is added to enhance the system's geometric constraints and operational stability. Specifically, the main beam 111 and the auxiliary beam 114 are rotatably connected at one end to the bottom beam connector 120 and at the other end to the peripheral vertical beams 200, respectively. In the initial assembly, they are arranged in a spaced and substantially parallel relationship. To maintain the aforementioned geometric relationship during the movement and load-bearing process of the mechanism, a connecting member 115 is provided between the main beam 111 and the auxiliary beam 114, and is connected to both of them by a revolute joint. This allows the connecting member 115 to flexibly constrain the relative posture of the main beam 111 and the auxiliary beam 114 throughout the entire movement stroke: In the unlocked / moving state, the connecting member 115 rotates in coordination with the four-bar linkage, limiting the relative sway and lateral misalignment of the two beams; in the locked state, the connecting member 115 abuts against the side of the main beam 111 away from the auxiliary beam 114, forming a clear end support and in-plane flatness constraint, thereby ensuring the flatness and position repeatability of the main beam 111.

[0097] In practical applications, when the main beam 111 and auxiliary beam 114 drive the peripheral vertical beam 200 to rotate around the bottom beam connector 120, the connector 115 can synchronously connect the main beam 111 and auxiliary beam 114, ensuring that they always maintain a predetermined interval and parallel relationship, thereby guaranteeing the stability of the motion trajectory and mechanical state of the four-bar linkage. Even under complex stress or frequent movement conditions of the vehicle structure, the addition of the connector 115 can significantly improve the overall rigidity and durability of the structure.

[0098] This embodiment addresses the technical problems of existing four-bar linkage bottom beam structures, such as insufficient stability, jamming, and accelerated wear caused by relative swaying, lateral displacement, and stress deformation of the main and auxiliary beams under complex loads and long-term cyclic motion. By adding a rotating connecting piece 115 between the main beam 111 and the auxiliary beam 114, an effective geometric constraint is formed on the distance and parallel posture of the two beams. On the one hand, during the motion phase, the connecting piece 115 synchronously connects the two beams, restricting relative swaying and out-of-plane warping, keeping the instantaneous center of the four-bar linkage consistent with the force transmission path, reducing hinge point off-center load and secondary clearance superposition, and ensuring the repeatability and smoothness of the motion trajectory. On the other hand, at the locked end, the connecting piece 115 provides reliable abutment and flatness constraint to the main beam 111, avoiding the decrease in flatness and positioning drift caused by slight rebound or deformation after locking. Therefore, this solution significantly improves the overall rigidity, vibration resistance, and durability of the bottom beam 110 structure, reduces uneven wear and early failure risk at hinges and guide surfaces, reduces jamming and failure rates caused by instability, and extends the life of the device; at the same time, it improves the tolerance and consistency of assembly and maintenance, ensuring that equipment such as wheeled vehicle 001 achieves stable operation, uniform stress, and reliable locking under frequent start-stop, impact, and vibration conditions.

[0099] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0100] Furthermore, when an element is referred to as 'fixed to' or 'set on' another element, it may be directly attached to that element, or there may be other intervening elements between them. When an element is referred to as 'connected to' another element, it can be directly connected to the other element or indirectly connected to the other element through an intervening element.

[0101] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, the use of terms such as "first" and "second" to denote features can explicitly express or imply the presence of at least one such feature. Additionally, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0102] The above description is merely an optional embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the content of the specification and drawings of this application under the concept of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A chassis for a wheeled vehicle, characterized in that, The chassis includes: Bottom beam connector; The bottom beam is rotatably connected to the bottom beam connector; and A limiting component is movably connected to the bottom beam connector. The chassis has a locked state and an unlocked state. In the locked state, the limiting component restricts the rotation of the bottom beam relative to the bottom beam connector. In the unlocked state, the limiting component is separated from the bottom beam, and the bottom beam can rotate relative to the bottom beam connector.

2. The chassis according to claim 1, characterized in that, The limiting component is slidably connected to the bottom beam connector.

3. The chassis according to claim 2, characterized in that, The bottom beam connector has a sliding groove, and the bottom beam is inserted into the sliding groove and rotatably connected to the bottom beam connector. The limiting component is slidably connected to the bottom beam connector along the sliding groove. In the locked state, the limiting component abuts against the bottom beam to restrict the rotation of the bottom beam.

4. The chassis according to claim 3, characterized in that, The limiting component includes a slider and a first reset member. The slider is slidably connected to the bottom beam connector along the groove. The first reset member is connected to both the slider and the bottom beam connector. The first reset member is used to drive the slider to maintain the locked state.

5. The chassis according to claim 4, characterized in that, The slider has a limiting groove and a notch communicating with the limiting groove. The first reset member is assembled in the limiting groove and is opposite to the notch. The bottom beam connector protrudes to form a column, and the column is opposite to the notch.

6. The chassis according to claim 4 or 5, characterized in that, In the vertical direction, the end of the slider near the opening of the groove is provided with a first chamfer, which is used to guide the bottom beam to rotate between the slider and the bottom beam connector.

7. The chassis according to claim 4 or 5, characterized in that, The slider is provided with: A space is provided for the rope to pass through; and A crossbar spans across the accommodating space.

8. The chassis according to any one of claims 1 to 5, characterized in that, The number of bottom beams is at least two, and the at least two bottom beams are arranged in a radiating pattern on the bottom beam connector. In the unlocked state, the at least two bottom beams retract towards each other, and in the locked state, the at least two bottom beams extend away from each other.

9. The chassis according to claim 8, characterized in that, The number of bottom beams is four, with adjacent bottom beams being symmetrical to each other. The number of limiting components is two, with each limiting component cooperating with every two bottom beams. Alternatively, the number of limiting components is four, with each limiting component cooperating with each bottom beam. When transitioning from the locked state to the unlocked state, the two or four limiting components move closer to each other.

10. The chassis according to claim 9, characterized in that, The chassis also includes pull ropes, which are respectively connected to the two or four limiting components; The pull rope includes a locking section, a crossing section, and a lifting section. The locking section is connected to two or four of the limiting components, the crossing section is connected to two or four of the locking sections to form an intersection point, and the lifting section is connected to the crossing section.

11. The chassis according to claim 8, characterized in that, The bottom beam connector includes a main body and at least two limiting parts. The main body has a sliding groove. The limiting parts are slidably connected to the bottom beam connector along the sliding groove. The at least two limiting parts are spaced apart around the main body. The limiting parts have a rotating groove communicating with the sliding groove. The bottom beam passes through the rotating groove and is inserted into the sliding groove. The bottom beam is rotatably connected to the limiting parts.

12. The chassis according to claim 11, characterized in that, There are at least two rotating slots, and the included angle between the extending directions of the two rotating slots is α, where 120°≤α≤170°.

13. The chassis according to any one of claims 1 to 5, characterized in that, The bottom beam includes a main beam and a blocking assembly. The main beam is rotatably connected to the bottom beam connector, and the blocking assembly is slidably connected to the main beam along its axial direction. The blocking assembly is used to elastically move and resist the limiting assembly in the locked state to restrict the rotation of the bottom beam.

14. The chassis according to claim 13, characterized in that, The blocking assembly includes a pin and a second reset member. The second reset member is connected to the pin and the main beam respectively. The pin is slidably connected to the main beam along its axial direction. The second reset member is used to drive the pin to elastically move and resist the limiting assembly when switching from the unlocked state to the locked state, so as to restrict the rotation of the bottom beam.

15. The chassis according to claim 14, characterized in that, The bottom beam also includes a rotating shaft, which is connected to the bottom beam connector. The main beam is rotatably connected to the bottom beam connector via the rotating shaft. The pin has a buffer groove, and the rotating shaft is inserted into the buffer groove.

16. The chassis according to claim 13, characterized in that, The bottom beam also includes an auxiliary beam, which is rotatably connected to the bottom beam connector. The auxiliary beam is parallel to and spaced apart from the main beam.

17. The chassis according to claim 16, characterized in that, The bottom beam also includes a connecting member, which is rotatably connected to the main beam and the auxiliary beam respectively. In the locked state, the connecting member abuts against the side of the main beam away from the auxiliary beam.

18. A wheeled vehicle, characterized in that, The wheeled vehicle includes: a peripheral vertical beam and a chassis as described in any one of claims 1 to 17, wherein the peripheral vertical beam is rotatably connected to the end of the bottom beam away from the bottom beam connector; and the wheeled vehicle is foldable when the chassis is in an unlocked state.

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