Telescopic locking device with elastic redundancy and splicing monomer

Abstract

The application relates to a telescopic locking device with elastic redundancy and a spliced monomer. The device is provided with mounting bases and spring abutting members in a radial distribution in a containing cavity. The mounting bases are pushed by the spring abutting members, so that the mounting bases are fixed in a normal state. When the device is subjected to an excessively high external load, the spring abutting members can offset the excessive load force, the automatic release of the arc-shaped rack stress of the spliced monomer under overload is realized, and the automatic reset of the structure inside after the disappearance of the overload force is realized. The device realizes the overload protection of the spliced monomer, and can avoid the damage of the spliced monomer structure under overload. Meanwhile, the spring abutting members inside the device link and push the mounting bases, so that the linkage stress between the locking points is realized, and the partial load jamming of the spliced monomer caused by uneven stress is avoided.

Description

Technical Field

[0001] This application relates to the field of mechanical connection structure technology, specifically to a telescopic locking device with elastic redundancy and a splicing unit. Background Technology

[0002] Modular splicing platforms are widely used in temporary platform construction, combined load-bearing platforms, modular display platforms, and assembled work bases. Existing locking methods for individual splicing units mainly include threaded fastening, snap-fit, and rotary locking, none of which can simultaneously meet the dual requirements of rapid assembly / disassembly and reliable locking. Based on these requirements, a press-type locking mechanism was designed. Pressing drives the internal lifting components to alternately rise and fall, causing the arc-shaped rack to extend or retract, inserting into or disengaging from the arc-shaped groove of the mating component, achieving rapid connection and separation.

[0003] However, the above structure still has defects: First, it lacks overload protection. In actual operation scenarios, the structure is easily damaged by the user pulling it with brute force. Second, traditional overload protection structures are mostly designed for independent locking points, resulting in a lack of linkage and synchronization within the mechanism. When the force is uneven, it is easy to get stuck due to uneven load. In addition, the overload protection structure is complex, occupies a lot of space, and cannot automatically reset after the overload is eliminated, requiring manual intervention.

[0004] In summary, there is an urgent need to design a telescopic locking device for splicing units under high stress loads, in order to solve the problems of existing splicing units lacking overload protection and having complex structures and inability to automatically reset. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, this application provides a telescopic locking device and splicing unit with elastic redundancy, specifically adopting the following technical solution: This application provides a telescopic locking device with elastic redundancy, comprising an upper housing and a lower housing that are fastened together, with a receiving cavity between the upper and lower housings; at least two mounting bases are provided in the receiving cavity, and the mounting bases are radially distributed around the center of the receiving cavity, with an arc-shaped rack in each mounting base; a first guide mechanism that engages with the mounting base is provided in the lower housing, and the first guide mechanism has a first limiting position and a second limiting position, and the mounting base slides back and forth between the first limiting position and the second limiting position along the first guide mechanism; a spring abutment is provided on the inner side of the mounting base, and the spring abutment is used to apply an elastic pushing force to the mounting base outward, so that the mounting base is normally in the first limiting position; when the mounting base moves inward under the action of an external force, the mounting base overcomes the elastic pushing force of the spring abutment and slides along the first guide mechanism to the second limiting position; when the external force on the mounting base disappears, the spring abutment pushes the mounting base back to the first limiting position.

[0006] Preferably, the spring abutment is provided with abutment grooves corresponding to the number of mounting bases, and each abutment groove accommodates one mounting base.

[0007] Preferred: The spring abutment is made of a metal elastic sheet bent into a regular polygon, the abutment groove is located at the corner of the regular polygon, and the middle of each side of the regular polygon is offset towards the center of the receiving cavity.

[0008] Furthermore, this application proposes that the abutment groove adopt a flat-bottomed U-shaped groove.

[0009] Preferred: The first guiding mechanism proposed in this application includes a first limiting block, two first limiting blocks are arranged opposite to each other, and a first guiding space is formed between the two first limiting blocks in a radial pattern along the center of the accommodating cavity, and the mounting base is located in the first guiding space.

[0010] Furthermore, this application proposes that a connecting base is provided below the first limiting block, the first limiting block is fixed on the connecting base, and the connecting base is fixedly connected to the lower housing.

[0011] Preferably, the present application proposes that the outer side of the mounting base is provided with a first accommodating space that extends vertically, and the connecting base is provided with an accommodating blind hole. When the mounting base is in the first limiting position, the first accommodating space is located above the accommodating blind hole.

[0012] Furthermore: This application proposes that a straight rack is provided in the first accommodating space, and a first elastic element is provided at the lower end of the straight rack. Part of the first elastic element is located in the first accommodating space, and the remaining part of the first elastic element is located in the accommodating blind hole; one end of the first elastic element is connected to the straight rack, and the other end of the first elastic element is connected to the bottom of the accommodating blind hole.

[0013] Furthermore, this application proposes that when the mounting base slides to the second limiting position, the first accommodating space and the accommodating blind hole are misaligned, at which time the first elastic element has lateral elastic deformation.

[0014] Furthermore, this application proposes that the first accommodating space adopts a U-shaped groove that opens towards the outside of the mounting base, the bottom of the U-shaped groove is connected to the mounting groove of the mounting base, and the side spacing of the first accommodating space is greater than the diameter of the first elastic member.

[0015] Preferably, this application proposes that a second guide mechanism be provided between the rack and the mounting base, which restricts the rack from sliding longitudinally relative to the mounting base and restricts the rack from displacing laterally relative to the mounting base.

[0016] In addition, this application proposes a splicing unit, which includes a first connector and a second connector, wherein the first connector adopts the above-mentioned telescopic locking device with elastic redundancy; the second connector is provided with an arc groove corresponding to the arc rack; the first connector and the second connector are docked and fixed by the arc rack extending into the arc groove.

[0017] Furthermore, this application proposes that the width of the arcuate groove of the second connector is greater than the width of the arcuate rack.

[0018] The technical solution of this application achieves the following beneficial effects: This application's telescopic locking device utilizes radially distributed mounting bases and spring-loaded abutments within a accommodating cavity. The spring-loaded abutments push against the mounting bases, securing them under normal conditions. When subjected to excessive external loads, the spring-loaded abutments counteract the excess load, enabling automatic release of force on the arc-shaped rack when the spliced ​​unit is overloaded and automatic internal repositioning of the structure after the overload disappears. This device provides overload protection for the spliced ​​unit, preventing structural damage during overload. Simultaneously, the internal spring-loaded abutments, in conjunction with the pushing of the mounting bases, ensure coordinated force distribution among the locking points, preventing uneven force distribution that could lead to uneven loading and jamming of the spliced ​​unit. Attached Figure Description

[0019] Figure 1 This is a structural diagram of the telescopic locking device in the embodiments of this application.

[0020] Figure 2 This is a schematic diagram of the assembly structure inside the lower shell in an embodiment of this application.

[0021] Figure 3 This is a diagram showing the state of the mounting base in the first limit position according to an embodiment of this application.

[0022] Figure 4 This is a diagram showing the state of the mounting base in the second limit position according to an embodiment of this application.

[0023] Figure 5 This is a state diagram showing the first and second connectors in the splicing unit of this application embodiment when they are in a connected state.

[0024] Figure 6 This is a diagram showing the state of the second connector in the splicing unit of this application embodiment when it is pulled forcefully.

[0025] Figure 7 This is a diagram showing the state of the splicing unit in this application when the arc-shaped rack is completely detached from the arc-shaped groove.

[0026] Figure 8 This is a schematic diagram of the structure of the spring abutment in the embodiments of this application.

[0027] Figure 9 This is a top-down view of the internal structure of the shell in an embodiment of this application.

[0028] Figure 10 This is an assembly structure diagram of the arc-shaped rack and arc-shaped extension mechanism according to an embodiment of this application.

[0029] Figure 11 This is an internal structural diagram of the mounting base according to an embodiment of this application.

[0030] The specific meanings of the reference numerals in the attached figures are as follows: 1-Upper housing; 2-Lower housing; 201-First limiting block; 201a-First guide space; 202-Connecting base; 2021-Accommodating blind hole; 2022-Second limiting rod; 3-Arc-shaped rack; 4-Mounting base; 401-Mounting groove; 402-First accommodating space; 5-Arc-shaped telescopic mechanism; 501-Straight rack; 5011-First limiting rod; 502-First elastic element; 503-Intermediate gear; 6-Spring abutment; 601-Abutment groove; 7-Arc-shaped groove; L1-Width of arc-shaped groove; L2-Width of arc-shaped rack.

[0031] Ⅰ-First connector; Ⅱ-Second connector; Ⅲ-Object to be connected. Detailed Implementation

[0032] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of this application. 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.

[0033] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] In the application of modular splicing platforms, individual splicing units face the problem of lacking overload protection mechanisms under high-load scenarios. Existing technologies lack effective overload protection for individual splicing units, leading to irreversible damage to the mechanical structure under excessive loads. Specifically, once the externally applied pull-out force exceeds the design threshold of the splicing unit, the internal structure is damaged and cannot automatically reset. Furthermore, traditional overload protection structures are complex and space-consuming, making them difficult to integrate into small-volume splicing units, thus affecting the reliability of locking and the continuity of operation. Moreover, traditional overload protection structures often involve independent settings for locking components, resulting in a lack of linkage and synchronization between locking points. Uneven stress can easily lead to off-center loading and jamming, further reducing the lifespan and operational efficiency of the device. If these problems are not addressed, individual splicing units will be unable to maintain functional integrity under overload conditions, causing permanent failure of mechanical components. The lack of an overload protection mechanism will limit the applicability of this device in scenarios with high reliability requirements, hindering the widespread application of modular splicing platforms.

[0035] Therefore, as Figure 1 As shown, this application proposes a telescopic locking device with elastic redundancy. The device is installed in the first connector I within the splicing unit. It is used to stably connect the first connector I and the second connector II. At the same time, when subjected to loads exceeding the normal operating range, it can absorb part of the energy through elastic deformation, thereby avoiding structural damage, and automatically return to the initial state after the load is released.

[0036] Among them, the combination Figure 1 and Figure 2 As shown, the telescopic locking device includes an upper housing 1 and a lower housing 2 that are fastened together, forming the main external support frame of the device. A receiving cavity is provided between the upper housing 1 and the lower housing 2, primarily for accommodating the internal working components of the device. At least two mounting bases 4 are provided within the receiving cavity, and these mounting bases 4 are radially distributed around the center of the receiving cavity. Each mounting base 4 has a mounting groove 401, and an arc-shaped rack 3 is disposed within the mounting groove 401. The arc-shaped rack 3 is driven by an arc-shaped telescopic mechanism 5 located within the mounting groove 401 to complete the extension or retraction action. The mounting base 4, as a moving component inside the device, mainly supports the arc-shaped rack 3 and can reciprocate under the guidance of the first guide mechanism. The arc-shaped rack 3 disposed within the mounting base 4 has an arc-shaped elongated structure, which is used to cooperate with the arc-shaped groove 7 of the second connecting body II to achieve connection and locking. The lower housing 2 is equipped with a first guide mechanism that cooperates with the mounting base 4. This first guide mechanism has a first limiting position and a second limiting position. The first guide mechanism guides and restricts the movement trajectory of the mounting base 4, ensuring that the mounting base 4 slides back and forth between the first and second limiting positions along the first guide mechanism. For example... Figure 3As shown, the first limiting position refers to the position of the mounting base 4 under normal conditions or without external force, which is usually the position where the mounting base 4 abuts against the side wall of the lower housing 2; while as Figure 4 As shown, the second limiting position refers to the limit position that the mounting base 4 can reach towards the center of the accommodating cavity after the splicing unit is subjected to excessive external load, such as the first connector I and the second connector II in the connected state being pulled with great force. It is usually the position that the mounting base 4 can reach when the arc-shaped rack 3 is completely detached from the arc-shaped groove 7 while in the extended state.

[0037] like Figure 3 As shown, the inner side of the mounting base 4 is provided with a spring abutment 6. This spring abutment 6 applies an elastic pushing force outwards to the mounting base 4, so that the mounting base 4 is in the first limiting position under normal conditions (i.e., without external load). When the mounting base 4 moves inwards under external force, it overcomes the elastic pushing force of the spring abutment 6 and slides along the guide limiting mechanism towards the second limiting position, as shown. Figure 4 As shown. When the external force on the mounting base 4 disappears, the spring abutment 6 pushes the mounting base 4 back to the first limit position. It should be noted that in this embodiment, the inner side of the mounting base 4 generally refers to the side of the mounting base 4 that is biased towards the center of the receiving cavity; while the outer side of the mounting base 4 generally refers to the side of the mounting base 4 that is opposite to the center of the receiving cavity, which is opposite to the inner side of the mounting base 4.

[0038] In this embodiment, the upper housing 1 and the lower housing 2 of the device are connected by a snap-fit ​​structure to form a closed or semi-closed cavity as a receiving cavity. This snap-fit ​​structure primarily restricts the separation of the upper housing 1 and the lower housing 2, while a certain distance of movement clearance still exists between them. The number of mounting bases 4 in this embodiment can be set according to actual needs, for example, two, three, or more. The mounting bases 4 are placed inside the receiving cavity and are evenly distributed radially around the center of the receiving cavity, for example, in a star-shaped or cross-shaped arrangement.

[0039] Specifically, in combination Figure 3 and Figure 4 As shown, when the mounting base 4 moves inward under the action of an external force, the mounting base 4 will overcome the elastic pushing force of the spring abutment 6 and slide along the first guide mechanism to the second limiting position; when the external force on the mounting base 4 disappears, the spring abutment 6 pushes the mounting base 4 back to the first limiting position. For example, Figure 5 In this embodiment, the first connector I and the second connector II are connected. When the second connector II is pulled forcefully, as shown... Figure 6As shown, the arc-shaped groove 7 of the second connecting body II will generate a lateral component force on the arc-shaped rack 3. The arc-shaped rack 3 drives the mounting base 4 connected below, which is subjected to a lateral component force toward the center of the accommodating cavity. The mounting base 4 will exert a force on the spring abutment 6, such as... Figure 4 As shown, the spring abutment 6 deforms towards the center of the accommodating cavity. When the external force pulling the second connecting body II is large enough, the mounting base 4 will slide along the first guide mechanism from the first limit position to the second limit position until the arc-shaped rack 3 is completely disengaged from the arc-shaped groove 7. Figure 7 As shown, when the arc-shaped rack 3 is completely disengaged from the arc-shaped groove 7, the lateral force on the mounting base 4 decreases or disappears. At this time, the compressed spring abutment 6 releases its stored elastic potential energy and pushes the mounting base 4 back to the initial first limit position along the first guide mechanism. The above process ensures that even if the splicing unit is separated by excessive external load, the internal structure will not be damaged, and it still has a normal locking connection function.

[0040] In this embodiment, the free movement of the mounting base 4 on the first guide mechanism, combined with the elastic pushing force provided by the spring abutment 6, ensures that after the arc-shaped rack 3 and the arc-shaped groove 7 are connected in the splicing unit, the arc-shaped rack 3 still has redundant displacement capability. When the splicing unit is subjected to excessive external force, the mounting base 4 overcomes the elastic pushing force of the spring abutment 6 and slides to the second limit position, causing the arc-shaped rack 3 to disengage from the arc-shaped groove 7, thereby releasing overload stress and preventing structural damage due to external force. At the same time, after the arc-shaped rack 3 disengages from the arc-shaped groove 7, the spring abutment 6 can promptly restore the mounting base 4 and the arc-shaped rack 3 to their original positions, allowing the telescopic locking device to restore its original function. In addition, in this embodiment, the spring abutment 6, the mounting base 4, and the first guide mechanism are all integrated into the accommodating cavity, making the entire device structure compact, effectively saving space, overcoming the shortcomings of traditional overload protection structures that are complex and occupy a large space, and making it more suitable for small-volume splicing units.

[0041] Furthermore, in combination Figure 2 and Figure 8 As shown, in this embodiment, the spring abutment 6 is provided with abutment grooves 601 corresponding to the number of mounting bases 4, and each abutment groove 601 accommodates one mounting base 4. The main function of these abutment grooves 601 is to provide a confined contact area for the mounting base 4, thereby ensuring that the spring abutment 6 can stably and accurately apply an elastic pushing force to the mounting base 4. In this embodiment, the abutment grooves 601 can be designed as groove structures that match the shape of the mounting base 4 to increase the contact area and stability.

[0042] Furthermore, the number of abutment grooves 601 provided on the spring abutment member 6 is equal to the number of mounting bases 4 in the device, ensuring that each mounting base 4 can obtain precise elastic support and positioning. It should be noted that in this embodiment, the spring abutment member 6 can be manufactured using an integral molding method, where the number of grooves equal to the number of mounting bases 4 can be directly formed using a mold during the manufacturing process. Alternatively, the spring abutment member 6 can be composed of multiple independent elastic units, each elastic unit having one abutment groove 601, which are then assembled together so that their total number corresponds to the number of mounting bases 4.

[0043] In the telescopic locking device of this embodiment, by providing abutment grooves 601 on the spring abutment member 6 corresponding to the number of mounting bases 4, the spring abutment member 6 can not only apply elastic force to the mounting base 4, but also provide a precise contact and limiting area for each mounting base 4 through the abutment grooves 601. When the mounting base 4 slides back and forth between the first limiting position and the second limiting position in the first guide mechanism, it always maintains a stable engagement with the abutment grooves 601. The abutment grooves 601 can effectively guide the displacement movement of the mounting base 4 and limit its lateral sway. When the mounting base 4 moves inward under the action of external force, it stably transmits the external force to the spring abutment member 6 through the abutment grooves 601 to overcome the elastic pushing force of the spring abutment member 6 and prevent it from sliding. When the external force disappears, the spring abutment member 6 precisely pushes the mounting base 4 back to the first limiting position through the abutment grooves 601. The aforementioned mechanism ensures the stability and positioning accuracy of each mounting base 4 during movement, avoiding jamming or shaking caused by unstable contact or uneven force.

[0044] In this embodiment, the spring abutment 6 is preferably manufactured using a one-piece molding method. Specifically, as shown below... Figure 8As shown, the spring abutment 6 is formed by bending a metal elastic sheet into a regular polygon. The abutment groove 601 is located at the corner of the regular polygon, and the middle of each side of the regular polygon is recessed towards the center of the receiving cavity. The metal elastic sheet can be made of a thin metal sheet material with good elasticity, fatigue strength, and corrosion resistance, such as spring steel, stainless steel, or beryllium copper alloy. It is formed by stamping, bending, and other processes, and can provide stable elastic deformation and restoring force. In this embodiment, the purpose of bending the metal elastic sheet into a regular polygon to form the spring abutment 6 is to provide uniform elastic support for multiple mounting bases 4 through an integrally formed structure, and at the same time, to utilize the geometric characteristics of the polygon to facilitate layout within the limited receiving cavity space. The regular polygon structure formed by bending the metal elastic sheet generally needs to be adapted to the shape of the receiving cavity formed by the upper and lower shells 2. For example, if the receiving cavity is square, the spring abutment 6 generally also adopts a bending structure in the positive direction or approximately the positive direction. In addition, in this embodiment, the spring abutment 6 can also be bent to form other symmetrical polygonal or ring structures to accommodate different numbers of mounting bases 4 or specific space constraints.

[0045] In this embodiment, the abutment groove 601 is a specific structure on the spring abutment member 6 used to accommodate the mounting base 4, such as... Figure 8 As shown, by placing it at the corner of the regular polygon, the structural strength and positioning characteristics at the corners can be utilized to provide stable contact points and guiding support for the mounting base 4, ensuring that the mounting base 4 can be accurately abutted and pushed under force. Furthermore, in this embodiment, the middle position of each side of the regular polygon is offset towards the center of the accommodating cavity, which is recessed to facilitate elastic deformation of the metal elastic sheet. Figure 4 As shown, when the mounting base 4 moves inward under external force, it presses against the groove 601, causing the concave structure in the center of the regular polygon to compress further inward, thereby generating an elastic restoring force. The degree of concavity in the center of each side of the regular polygon in the above structure can be designed with different curvatures or angles to adjust the stiffness and stroke characteristics of the elastic sheet, ensuring that the mounting base 4 can provide appropriate elastic resistance when subjected to external force, and quickly push it back after the external force disappears.

[0046] In this embodiment, the structure of the spring abutment 6 effectively solves the problems of uneven elastic support force, complex structure, and low space utilization among multiple mounting bases 4. The integrated elastic sheet structure of the spring abutment 6 can provide a uniform and stable elastic pushing force to multiple mounting bases 4, ensuring the smoothness and reliability of the reciprocating sliding of the mounting bases 4 between the first and second limit positions. In addition, compared with the scheme using multiple elastic units, the above-mentioned regular polygonal elastic sheet structure simplifies the assembly process, reduces the number of parts, optimizes the spatial layout within the accommodating cavity, and improves the overall compactness and manufacturing efficiency of the device.

[0047] As a preferred embodiment, the abutment groove 601 in this embodiment can adopt different groove structures such as V-shaped grooves and U-shaped grooves, and its structure is generally adapted to the shape of the mounting base 4. This embodiment preferably adopts a flat-bottomed U-shaped groove, which is a groove structure with a flat bottom and side walls extending in a U-shaped curve or straight line. This structure can ensure that the mounting base 4 obtains stable support in the groove and reduce shaking. When the mounting base 4 slides back and forth between the first limit position and the second limit position, it can obtain stable guidance and support, effectively avoiding shaking or jamming caused by mismatch of groove shape or unstable support.

[0048] As a preferred method, such as Figure 9 As shown, in this embodiment, the first guiding mechanism employs two relatively spaced first limiting blocks 201, forming a first guiding space 201a radially distributed along the center of the accommodating cavity between the two first limiting blocks 201. The mounting base 4 is located within the first guiding space 201a. The first limiting blocks 201 can restrict or guide the movement of the mounting base 4. The first limiting blocks 201 can take the form of protrusions, walls, ribs, or pillars, etc., and primarily contact the sides of the mounting base 4 to provide support and guidance. Furthermore, the first limiting blocks 201 are typically fixedly connected to the lower housing 2. The purpose of arranging the two first limiting blocks 201 relative to each other is to form a defined guiding space between them to constrain the lateral movement of the mounting base 4. For example, the two first limiting blocks 201 can be arranged in parallel to adapt to specific guiding requirements. The size and shape of the first guide space 201a are designed to match the shape of the mounting base 4 to ensure that the mounting base 4 can move smoothly and easily within it, while limiting unnecessary lateral displacement. Generally, the width of the mounting base 4 is slightly smaller than the spacing of the first guide spaces 201a to allow the mounting base 4 to slide freely within the first guide space 201a, while ensuring that its movement trajectory is precisely guided and constrained. The first guide spaces 201a are arranged radially outward from the center of the receiving cavity, coordinating with the overall layout of the mounting bases 4 radially distributed around the center of the receiving cavity, ensuring that the sliding direction of each mounting base 4 points only towards or away from the center of the receiving cavity.

[0049] The first guide space 201a formed by the first limiting block 201 in the above structure provides a precise and stable physical constraint for the sliding of the mounting base 4. It can effectively solve the problems of deviation, jamming or shaking that may occur during the sliding of the mounting base 4, and ensure that the mounting base 4 can always move smoothly and steadily back and forth between the first limiting position and the second limiting position along the preset trajectory, so as to significantly improve the operational reliability, stability and service life of the telescopic locking device.

[0050] like Figure 9 As shown, in this embodiment, based on the aforementioned first limiting block 201, a connecting base 202 is further provided below the first limiting block 201. The first limiting block 201 is fixed to the connecting base 202, and the connecting base 202 is fixedly connected to the lower housing 2. The purpose of the connecting base 202 is to provide a stable mounting platform and support structure for the first limiting block 201. The connecting base 202 can be implemented in various forms, such as being designed as an independent block structure and fixed to the lower housing 2 by adhesive bonding, or it can be designed as an integral injection molded unit with the lower housing 2. As a support structure for the first limiting block 201, the connecting base 202 allows the first limiting block 201 to be indirectly connected to the lower housing 2 through the connecting base 202, forming a stable support.

[0051] In addition, combined Figure 9 and Figure 10 As shown, in this embodiment, a first accommodating space 402 extending vertically is provided on the outer side of the mounting base 4, and a blind accommodating hole 2021 is provided on the connecting base 202. When the mounting base 4 is in the first limiting position, the first accommodating space 402 is located above the blind accommodating hole 2021, as shown. Figure 5 As shown. The first accommodating space 402 is a structure located on the outside of the mounting base 4 to accommodate other components or provide a passage. It can take various forms, such as a rectangular groove, a U-shaped groove, a circular hole, or an irregularly shaped slot. The first accommodating space 402 extends from the top to the bottom of the mounting base 4, forming a through channel. It is mainly used to provide space for the installation or movement of other components, or as part of a guide structure. The accommodating blind hole 2021 provided on the connecting base 202 mainly serves to accommodate components such as springs, pins, and limiting posts.

[0052] Furthermore, in combination Figure 5 and Figure 11As shown, in this embodiment, a rack 501 is provided in the first accommodating space 402, and a first elastic element 502 is provided at the lower end of the rack 501. Part of the first elastic element 502 is located in the first accommodating space 402, and the remaining part of the first elastic element 502 is located in the accommodating blind hole 2021. One end of the first elastic element 502 is connected to the rack 501, and the other end of the first elastic element 502 is connected to the bottom of the accommodating blind hole 2021. In this embodiment, the rack 501 is mainly used to cooperate with the intermediate gear 503 to convert the linear motion between the upper and lower housings 2 into the extension and retraction motion of the arc-shaped rack 3. The first elastic element 502 can undergo elastic deformation under external force and return to its original shape after the external force is removed. The main function of the first elastic element 502 is to provide elastic support or cushioning to assist the rack 501 in moving up and down. The first elastic element 502 is positioned in both the first accommodating space 402 and the accommodating blind hole 2021. When the mounting base 4 is subjected to external force and moves to the second limiting position, the first accommodating space 402 and the accommodating blind hole 2021 become misaligned, and the first elastic element 502 is stretched due to this misalignment. At this time, the first elastic element 502 exhibits lateral elastic deformation. Once the external force on the mounting base 4 disappears, due to the restoring force of the first elastic element 502 itself, it will simultaneously apply a certain force to the mounting base 4, driving the mounting base 4 to return to the first limiting position. Furthermore, in this embodiment, a first limiting rod 5011 is provided at the lower end of the rack 501, and a second limiting rod 2022 is correspondingly provided in the accommodating blind hole 2021. One end of the first elastic member 502 is sleeved to the first limiting rod 5011, and the other end of the first elastic member 502 is sleeved to the second limiting rod 2022. By guiding the sleeved connection of the two ends of the first elastic member 502 through the first limiting rod 5011 and the second limiting rod 2022, it is ensured that the first elastic member 502 always remains on the preset axis throughout the entire working stroke, thereby providing a stable and consistent elastic force and preventing the first elastic member 502 from detaching and failing.

[0053] In this embodiment, the first accommodating space 402 adopts a U-shaped slot that opens towards the outside of the mounting base 4. The bottom of the U-shaped slot is connected to the mounting groove 401 of the mounting base 4, and the side spacing of the first accommodating space 402 is greater than the diameter of the first elastic member 502. The U-shaped slot can accommodate part of the structure of the rack 501 and the first elastic member 502. In this embodiment, the first accommodating space 402 is slightly larger than the diameter of the first elastic member 502 to ensure that it can be smoothly placed or removed, avoiding jamming or installation difficulties due to insufficient space.

[0054] It should be noted that in this embodiment, the rack 501 can be directly placed in the first accommodating space 402. At this time, there is no structural restriction between the rack 501 and the mounting base 4 in the lateral direction. When the mounting base 4 is moved by an external force, the rack 501 remains in its original position, and at this time, the rack 501 disengages from the intermediate gear 503. When the external force on the mounting base 4 disappears, the rack 501 re-engages with the intermediate gear 503. However, this structure may cause changes in the extension and retraction state of the arc-shaped rack 3, and result in asynchronous extension and retraction states of different arc-shaped racks 3. Furthermore, in this embodiment, a second guide mechanism is provided between the rack 501 and the mounting base 4. The second guide mechanism restricts the rack 501 from sliding longitudinally relative to the mounting base 4 and restricts the rack 501 from displacing laterally relative to the mounting base 4. The second guiding mechanism can be implemented in various ways. For example, it can be achieved by providing a guide groove on the side of the rack 501 and a guide protrusion that mates with the guide groove on the inner wall of the mounting base 4; or by providing a guide groove on the inner wall of the mounting base 4 and a guide protrusion that mates with the guide groove on the side of the rack 501. By restricting the rack 501 from sliding longitudinally relative to the mounting base 4, it ensures that the rack 501 can only move in a preset longitudinal direction, thus achieving its telescopic function. When the mounting base 4 is moved by an external force, the rack 501 moves along with it. At this time, the first elastic element 502 is stretched in a misaligned manner, such as... Figure 6 As shown; when the external force on the mounting base 4 disappears, the mounting base 4 will be simultaneously acted upon by the elastic abutment and the first elastic element 502, causing the mounting base 4 to return to the first limit position, as shown. Figure 7 As shown. In addition, to avoid the first limiting rod 5011 below the rack 501 being too long and interfering with the connecting base 202, the connecting base 202 can also be designed as a movable part, in which case the connecting base 202 can move synchronously with the mounting base 4.

[0055] In addition, combined Figures 5-7As shown in the embodiment, this application also discloses a splicing unit, including a first connecting body I and a second connecting body II. The first connecting body I adopts the above-mentioned telescopic locking device with elastic redundancy. The second connecting body II is provided with an arc-shaped groove 7 corresponding to the arc-shaped rack 3. The arc-shaped rack 3 extends into the arc-shaped groove 7, so that the first connecting body I and the second connecting body II are docked and fixed. Since the spring abutment 6 built into the telescopic locking device of this embodiment abuts against the mounting base 4, when the splicing unit is subjected to an unexpected overload pull force, the mounting base 4 can overcome the elastic pushing force of the spring abutment 6 and slide along the first guide mechanism to the second limit position, so that the arc-shaped rack 3 is disengaged from the arc-shaped groove 7, thereby absorbing the overload energy and avoiding structural damage. Once the overload external force disappears, the elastic pushing force of the spring abutment 6 automatically pushes the mounting base 4 back to the first limit position, so that the arc-shaped rack 3 returns to its original position without manual intervention. In this embodiment, the splicing unit replaces the traditional rigid locking structure with the above-mentioned elastic redundant telescopic locking device, which effectively solves the problem of uneven load jamming caused by the lack of overload protection of the splicing unit and the uneven force on the locking point (i.e. the structure formed by the arc-shaped rack 3 and the arc-shaped groove 7).

[0056] Furthermore, to prevent the arc-shaped rack 3 from failing to disengage smoothly from the arc-shaped groove 7 when the spliced ​​unit is under overload protection, such as... Figure 7 As shown, in this embodiment, the width L1 of the arc-shaped groove of the second connector II is greater than the width L2 of the arc-shaped rack. Specifically, the arc-shaped groove 7 on the second connector II for accommodating the arc-shaped rack 3 has a lateral dimension (i.e., the dimension perpendicular to the extension direction of the arc-shaped rack 3) that is greater than the corresponding lateral dimension of the arc-shaped rack 3 itself. The additional lateral clearance provided by the arc-shaped groove 7 allows the arc-shaped rack 3 to be smoothly guided into the arc-shaped groove 7 without interference or jamming, even with slight alignment or angular deviations. Furthermore, when the spliced ​​unit is subjected to overload protection, the arc-shaped groove 7 provides ample space for the arc-shaped rack 3, ensuring that the arc-shaped rack 3 reliably disengages from the arc-shaped groove 7 and ensuring stable overload protection of the spliced ​​unit.

[0057] The above are merely preferred embodiments of this application. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A telescopic locking device with elastic redundancy, characterized in that, The device includes an upper housing and a lower housing that are fastened together, with a receiving cavity between the upper housing and the lower housing; at least two mounting bases are provided in the receiving cavity, and the mounting bases are radially distributed around the center of the receiving cavity, with an arc-shaped rack in each mounting base; The lower housing is provided with a first guide mechanism that cooperates with the mounting base. The first guide mechanism has a first limiting position and a second limiting position. The mounting base slides back and forth between the first limiting position and the second limiting position along the first guide mechanism. The inner side of the mounting base is provided with a spring abutment. The spring abutment is used to apply an elastic pushing force to the mounting base outward, so that the mounting base is normally in the first limiting position. When the mounting base moves inward under the action of external force, the mounting base overcomes the elastic pushing force of the spring abutment and slides along the first guide mechanism to the second limiting position. When the external force on the mounting base disappears, the spring abutment pushes the mounting base back to the first limiting position.

2. The telescopic locking device with elastic redundancy according to claim 1, characterized in that, The spring abutment member is provided with abutment grooves corresponding to the number of mounting bases, and each abutment groove accommodates one mounting base.

3. The telescopic locking device with elastic redundancy according to claim 1, characterized in that, The spring abutment is formed by bending a metal elastic sheet into a regular polygon. The abutment groove is located at the corner of the regular polygon, and the middle of each side of the regular polygon is recessed towards the center of the receiving cavity.

4. The telescopic locking device with elastic redundancy according to claim 1, characterized in that, The abutment groove is a flat-bottomed U-shaped groove.

5. The telescopic locking device with elastic redundancy according to claim 1, characterized in that, The first guiding mechanism includes a first limiting block, two first limiting blocks are arranged opposite to each other, and a first guiding space is formed between the two first limiting blocks in a radial pattern along the center of the accommodating cavity, and the mounting base is located in the first guiding space.

6. The telescopic locking device with elastic redundancy according to claim 5, characterized in that, A connecting base is provided below the first limiting block, the first limiting block is fixed on the connecting base, and the connecting base is fixedly connected to the lower housing.

7. The telescopic locking device with elastic redundancy according to claim 6, characterized in that, The mounting base has a first accommodating space that extends vertically on its outer side, and the connecting base has an accommodating blind hole. When the mounting base is in the first limiting position, the first accommodating space is located above the accommodating blind hole.

8. The telescopic locking device with elastic redundancy according to claim 7, characterized in that, The first accommodating space is provided with a straight rack, and the lower end of the straight rack is provided with a first elastic element. The first elastic element is partially located in the first accommodating space, and the remaining part of the first elastic element is located in the accommodating blind hole. One end of the first elastic element is connected to the straight rack, and the other end of the first elastic element is connected to the bottom of the accommodating blind hole.

9. The telescopic locking device with elastic redundancy according to claim 8, characterized in that, When the mounting base slides to the second limiting position, the first accommodating space is misaligned with the accommodating blind hole, and the first elastic element has lateral elastic deformation.

10. The telescopic locking device with elastic redundancy according to claim 8, characterized in that, The first accommodating space adopts a U-shaped groove that opens towards the outside of the mounting base. The bottom of the U-shaped groove is connected to the mounting groove of the mounting base, and the side spacing of the first accommodating space is greater than the diameter of the first elastic member.

11. The telescopic locking device with elastic redundancy according to claim 8, characterized in that, A second guide mechanism is provided between the rack and the mounting base. The second guide mechanism restricts the rack from sliding longitudinally relative to the mounting base and restricts the rack from displacing laterally relative to the mounting base.

12. A type of splicing unit, characterized in that, The device includes a first connector and a second connector, wherein the first connector employs a telescopic locking device with elastic redundancy as described in any one of claims 1-11; the second connector is provided with an arc-shaped groove corresponding to the arc-shaped rack; the first connector and the second connector are docked and fixed by the arc-shaped rack extending into the arc-shaped groove.

13. The splicing unit according to claim 12, characterized in that, The width of the arc-shaped groove of the second connector is greater than the width of the arc-shaped rack.

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