Repeated locking and releasing mechanism

Abstract

The invention provides a repeated locking and releasing mechanism. The repeated locking and releasing mechanism comprises a packaging bolt assembly and a packaging nut assembly. The packaging bolt assembly comprises a bolt mounting plate, a moving bolt in threaded connection with the bolt mounting plate and a driving structure which drives the moving bolt to rotate and moves on the bolt mounting plate in the axial direction of the moving bolt. The packaging nut assembly comprises a shell, a locking nut arranged in the shell in a floating mode and an adjusting structure connected with the shell and the locking nut. A through hole is formed in the shell; one end, matched with the moving bolt, of the locking nut is exposed through the through hole; the moving bolt comprises a threaded rod section and a guide rod section; the locking nut comprises a guide conical surface matched with the guide rod section and an inner threaded hole in threaded connection with the threaded rod section; the adjusting structure is configured to enable the moving bolt to move towards the locking nut under the driving of the driving structure, and the locking nut is driven to perform posture adjustment through contact force between the guide rod section and the guide conical surface, so that the threaded rod section and the inner threaded hole are coaxially aligned to realize spiral locking of the moving bolt and the locking nut.

Description

Technical Field

[0001] This invention relates to the field of mechanical engineering technology. More specifically, it relates to a repeatable locking and releasing mechanism. Background Technology

[0002] Modular devices with single functions and individual packaging are a prerequisite and technological foundation for rapid expansion of functions and maintenance systems. For example, on-orbit replaceable modular units can extend the lifespan of spacecraft to some extent. Locking and releasing mechanisms are a crucial support for the modular design of equipment.

[0003] To achieve the connection between the replaceable module and its target, the locking end and the locked end must meet a certain relative positional accuracy; that is, the relative deviation between the two mating end faces should be within the permissible accuracy range of the locking mechanism connection. Most replaceable units are operated by a robotic arm to connect them to the target. Generally, the control precision of the robotic arm cannot meet the connection requirements of the locking mechanism. This necessitates that the locking mechanism have a certain initial tolerance to assist in adjusting the positional deviation between the replaceable unit and its target. The replaceable module may need to be temporarily separated from its target due to malfunctions or other issues, and then reconnected after repairs. This requires the locking and releasing mechanism to be repeatable.

[0004] Currently, repeatable locking and releasing technologies mainly include two types: plug-in type and three-jaw type. Plug-in type locking and releasing mechanisms have problems such as low tolerance, high positioning accuracy requirements, and complex structure; three-jaw type locking and releasing mechanisms have problems such as large size and unreliable connection. Summary of the Invention

[0005] The purpose of this invention is to provide a repeatable locking and releasing mechanism to solve at least one of the above-mentioned technical problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: This invention provides a repeatable locking and releasing mechanism, comprising: Encapsulated bolt assemblies and encapsulated nut assemblies; The encapsulated bolt assembly includes a bolt mounting plate, a movable bolt screwed onto the bolt mounting plate, and a drive structure for driving the movable bolt to rotate and move along the axial direction of the movable bolt on the bolt mounting plate. The encapsulated nut assembly includes a housing, a locking nut floating within the housing, and an adjustment structure connecting the housing and the locking nut; the housing has a through hole; one end of the locking nut for engaging with a moving bolt is exposed through the through hole; The moving bolt includes a threaded rod segment and a guide rod segment, and the locking nut includes a guide cone surface for cooperating with the guide rod segment and an internal threaded hole for screwing into the threaded rod segment; The adjustment structure is configured such that when the moving bolt moves toward the locking nut under the drive of the drive structure, the contact force between the guide rod segment and the guide cone surface drives the locking nut to adjust its posture, so that the threaded rod segment is coaxially aligned with the internal threaded hole to achieve helical locking of the moving bolt and the locking nut.

[0007] A preferred embodiment is that the drive structure includes a first housing with one open end, a driver fixed inside the first housing, and a rotating cylinder disposed inside the first housing and connected to the drive shaft of the driver; the inner wall of the rotating cylinder is formed with an internal spline structure, and the moving bolt also includes a mating section connected to the end of the threaded rod segment away from the guide rod segment, and the mating section is formed with an external spline structure that is embedded in the internal spline structure; the open end of the first housing is fixed to one side of the bolt mounting plate.

[0008] A preferred embodiment is that the bolt mounting plate includes a first threaded hole for screwing into the threaded section of the moving bolt and an inwardly recessed groove formed on the side surface of the bolt mounting plate near the first housing; the first threaded hole and the groove are coaxially arranged; the drive structure further includes a bearing whose outer ring is fixed to the side wall of the groove; the inner ring of the bearing is fixed to the outer circumferential surface of the rotating cylinder.

[0009] A preferred embodiment is that the rotating drum includes a first elastic element arranged along the axial direction of the moving bolt; one end of the first elastic element is fixed to the top surface of the rotating drum, and the other end is fixed to the mating section of the moving bolt.

[0010] A preferred embodiment is that the outer casing includes a nut mounting plate and a second housing fixed to one side of the nut mounting plate; the through hole is formed on the nut mounting plate; the locking nut includes a first structural part, a second structural part, and a third structural part connected in sequence; a guide cone hole is formed in the first structural part, and the inner wall of the guide cone hole forms the guide cone surface; an internal thread hole is formed in the second structural part and communicates with the guide cone hole; and a receiving hole communicating with the internal thread hole is formed in the third structural part.

[0011] A preferred embodiment is that a second elastic element is provided inside the second housing; the locking nut is floatingly disposed inside the second housing via the second elastic element; the second elastic element is disposed along the axial direction of the locking nut; the second structural part penetrates through the second elastic element, one end of the second elastic element abuts against the first structural part, and the other end abuts against the second housing; the first structural part of the locking nut abuts against the nut mounting plate.

[0012] A preferred embodiment is that the outer peripheral surface of the third structural part is formed with a second external thread; the adjustment structure includes a limiting adjustment hole opened on the bottom wall of the second housing, an adjustment shim for cooperating with the limiting adjustment hole, and a threaded member for screwing into the second external thread; the adjustment shim includes a protrusion that is clearance-fitted with the limiting adjustment hole; the third structural part extends out of the second housing through the limiting adjustment hole; the limiting adjustment hole is a prismatic hole, the corner of the limiting adjustment hole is arc-shaped, and the protrusion is a cylinder that is clearance-fitted with the arc-shaped corner.

[0013] A preferred embodiment is that the adjustment structure further includes a second annular boss formed on the side of the nut mounting plate near the locking nut and an annular mating arc surface disposed on the outer periphery of the first structural part; the inner diameter of the second annular boss is larger than the diameter of the through hole; the annular mating arc surface is an outwardly convex arc shape in any cross section in the axial direction, and the first structural part is located inside the second annular boss and is clearance-fitted with the inner surface of the second annular boss through the annular mating arc surface.

[0014] A preferred embodiment is that the radial cross-sectional diameter of the first structural part is greater than the radial cross-sectional diameter of the second structural part, the radial cross-sectional diameter of the first structural part is not greater than the inner diameter of the second annular boss, and the radial cross-sectional diameter of the first structural part is not less than the inner diameter of the through hole.

[0015] A preferred embodiment is that the bolt mounting plate further includes an outwardly protruding first annular boss formed on the other side of the bolt mounting plate; the first threaded hole and the first annular boss are coaxially arranged; the outer diameter of the first annular boss is equal to the inner diameter of the through hole; when the moving bolt and the locking nut are locked, the first annular boss can be embedded in the through hole.

[0016] The beneficial effects of this invention are as follows: This invention provides a repetitive locking and releasing mechanism comprising a sealed bolt assembly and a sealed nut assembly. The sealed bolt assembly includes a bolt mounting plate, a movable bolt screwed onto the bolt mounting plate, and a driving structure for driving the movable bolt to rotate and move along the axial direction of the movable bolt on the bolt mounting plate. The sealed nut assembly includes a housing, a locking nut floatingly disposed within the housing, and an adjustment structure connecting the housing and the locking nut. The housing has a through hole. One end of the locking nut that mates with the movable bolt is exposed through the through hole. The movable bolt includes a threaded rod segment and a guide rod segment. The locking nut includes a guide cone surface that mates with the guide rod segment and an internal threaded hole that screws with the threaded rod segment. The adjustment structure is configured such that when the movable bolt moves toward the locking nut under the drive of the driving structure, the contact force between the guide rod segment and the guide cone surface drives the locking nut to adjust its posture, so that the threaded rod segment and the internal threaded hole are coaxially aligned to achieve helical locking of the movable bolt and the locking nut. This invention utilizes the cooperation between the guide rod segment at the front end of the moving bolt and the guide cone surface of the locking nut. This allows the mechanism to automatically correct the relative positional deviation between the moving bolt and the locking nut during the initial locking stage, achieving a smooth transition from coarse guidance to fine mating, significantly reducing the stringent requirements for initial mating accuracy. The core locking mechanism of this invention employs a classic bolt-nut pair transmission, providing high locking force, high connection rigidity and strength, and reliable operation. Furthermore, it features a simple structure, mature technology, and controllable manufacturing costs. The floating design of the locking nut, combined with an adjustment structure, allows for relative posture adjustment between the locking nut and the moving bolt during locking. When multiple sets of this invention's mechanisms are installed in parallel on the same mating surface, they effectively absorb and compensate for cumulative errors caused by processing, assembly, and deformation, ensuring reliable locking at all connection points and significantly reducing the requirements for positioning and installation accuracy. The mechanism of this invention is clearly divided into two independent functional modules: a sealing bolt assembly and a sealing nut assembly. This design facilitates rapid replacement and maintenance. Attached Figure Description

[0017] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0018] Figure 1 This is one of the overall structural schematic diagrams of the present invention in the locked state.

[0019] Figure 2 This is the second schematic diagram of the overall structure of the present invention in the released state.

[0020] Figure 3 This is an assembly diagram of the encapsulation bolt assembly of the present invention.

[0021] Figure 4 This is an assembly diagram of the encapsulated nut assembly of the present invention.

[0022] Figure 5 This is one of the structural schematic diagrams of the bolt mounting plate of the present invention.

[0023] Figure 6 This is the second structural schematic diagram of the bolt mounting plate of the present invention.

[0024] Figure 7 This is one of the structural schematic diagrams of the nut mounting plate of the present invention.

[0025] Figure 8 This is the second structural schematic diagram of the nut mounting plate of the present invention.

[0026] Figure 9 This is a schematic diagram of the cross-sectional structure of the locking nut of the present invention.

[0027] Figure 10 This is a schematic diagram of the structure of the second housing of the present invention.

[0028] Figure 11 This is one of the schematic diagrams showing the fit between the second housing and the adjusting shim of the present invention.

[0029] Figure 12 This is the second schematic diagram of the fit between the second housing and the adjusting shim of the present invention. Detailed Implementation

[0030] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0031] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0032] Technologies and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such technologies and equipment should be considered part of the specification.

[0033] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0035] This invention provides a repeatable locking and releasing mechanism, combined with Figures 1-12As shown, the repetitive locking and releasing mechanism specifically includes: a sealed bolt assembly and a sealed nut assembly; the sealed bolt assembly includes a bolt mounting plate 1, a moving bolt 3 screwed onto the bolt mounting plate 1, and a driving structure for driving the moving bolt 3 to rotate and move along the axial direction of the moving bolt on the bolt mounting plate 1. The sealed nut assembly includes a housing, a locking nut 9 floatingly disposed within the housing, and an adjustment structure connecting the housing and the locking nut 9; the housing is provided with a through hole 802; one end of the locking nut 9 that mates with the moving bolt 3 is exposed through the through hole 802. The moving bolt 3 includes a threaded rod segment 302 and a guide rod segment 301. The locking nut 9 includes a guide cone surface 901 that mates with the guide rod segment 302 and an internal threaded hole 903 that screws into the threaded rod segment 302. The adjustment structure is configured such that when the moving bolt 3 moves toward the locking nut 9 under the drive of the drive structure, the contact force between the guide rod segment 301 and the guide cone surface 901 drives the locking nut 9 to adjust its posture, so that the threaded rod segment 302 is coaxially aligned with the internal threaded hole 903 to achieve helical locking of the moving bolt 3 and the locking nut 9. This repetitive locking and releasing mechanism has a pre-locking guidance function, supporting locking situations with large initial deviations. It also has appropriate posture adjustment capabilities during locking, adapting to certain angular deviations. The overall structure is simple and has high connection reliability. Both the encapsulated bolt assembly and the encapsulated nut assembly adopt a modular design, facilitating quick maintenance and replacement. This invention utilizes the guide rod segment 301 in conjunction with the guide cone surface 901 to improve the initial tolerance of the locking and releasing mechanism. The simple screw-locking method simplifies the complexity of the locking and releasing mechanism, giving it good stability and connection rigidity. Furthermore, the semi-flexible adjustable design reduces the positioning accuracy requirements of the locking and releasing mechanism; the modular design improves the component replacement efficiency of the locking and releasing mechanism.

[0036] In one specific embodiment, the drive structure includes a first housing with one open end, a driver 6 fixed inside the first housing, and a rotating cylinder 5 disposed inside the first housing and connected to the drive shaft of the driver 6. The first housing is a moving bolt housing 7. The inner wall of the rotating cylinder 5 forms an internal spline structure. The moving bolt 3 also includes a mating section 303 connected to the end of the threaded rod section 302 away from the guide rod section 301. The mating section 303 forms an external spline structure that is embedded in the internal spline structure, and the two form a spline connection. That is, the interior of the rotating cylinder 5 is a hollow structure, the inner wall is an internal spline structure, and it is connected to the moving bolt 3 through a spline structure. The open end of the first housing is fixed to the side of the bolt mounting plate 1 facing away from the encapsulated nut assembly. The bolt mounting plate 1 is fixedly connected to the first housing by threads. Through the above arrangement, the driver 6, the rotating cylinder 5, and the moving bolt 3 are integrated into a housing, which not only protects the internal transmission components from external environmental interference, but also realizes the standardization and modularization of the entire drive structure, facilitates overall disassembly and maintenance, and further improves the reliability of the mechanism. The driver 6 is fixedly connected to the first housing by threads. The driver 6 can be a stepper motor or a servo motor. The rotating drum 6 is fixedly connected to the motor shaft by threads.

[0037] Furthermore, the bolt mounting plate 1 includes a first threaded hole 101 for screwing into the threaded section 302 of the moving bolt 3, and an inwardly recessed groove 103 formed on the side surface of the bolt mounting plate 1 near the first housing. The first threaded hole 101 and the groove 103 are coaxially arranged; the drive structure also includes a bearing 2 whose outer ring is fixed to the side wall of the groove 103; the inner ring of the bearing 2 is fixed to the outer circumferential surface of the rotating cylinder 5. The rotating cylinder 5 is connected to the bolt mounting plate 1 through the bearing 2. The first threaded hole 101 and the first external thread on the threaded section 302 of the moving bolt 3 form a threaded motion pair, thereby converting the rotational motion of the moving bolt 3 into linear motion along the axial direction of the moving bolt 3, thereby realizing the forward movement of the moving bolt 3 to lock with the locking nut 9 and the backward movement to disengage from the locking nut 9. After the driver 6 starts working, it will drive the rotating cylinder 5 to rotate, and the rotating cylinder 5 drives the moving bolt 3 to rotate through a spline engagement. Through the threaded transmission with the first threaded hole 101 at the center of the bolt mounting plate 1, the moving bolt moves along its own axial direction while rotating, locking or disengaging with the locking nut 9.

[0038] In one specific embodiment, the rotating drum 5 includes a first elastic element arranged axially along the moving bolt 3; one end of the first elastic element is fixed to the top surface of the rotating drum 5, and the other end is fixed to the mating section 303 of the moving bolt 3. This first elastic element is a bolt preload spring 4, which is installed between the moving bolt 3 and the inner top surface of the rotating drum 5. Here, the inner top surface of the rotating drum 5 refers to the inner wall surface of the rotating drum 5 away from the bolt mounting plate 1.

[0039] In one specific embodiment, the outer shell includes a nut mounting plate 8 and a second housing fixed to one side of the nut mounting plate 8; the second housing is the nut outer shell 12. A through hole 802 is formed on the nut mounting plate 8; a second annular boss 801 is formed on the side of the nut mounting plate 8 facing away from the bolt mounting plate 1, the inner diameter of the second annular boss 801 being larger than the diameter of the through hole 802. The locking nut 9 includes a first structural portion 91, a second structural portion 92, and a third structural portion 93 connected in sequence; a guide cone hole is formed in the first structural portion 91, and the inner wall of the guide cone hole forms the guide cone surface 901; an internal threaded hole 903 is formed in the second structural portion 92 and communicates with the guide cone hole; a receiving hole 904 is formed in the third structural portion 93 and communicates with the internal threaded hole 903; the receiving hole 904 is used to receive the guide rod segment 301 of the moving bolt 3. The nut mounting plate 8 and the nut outer shell 12 are fixedly connected by threads. The guide rod section 301 of the moving bolt 3 is guided before locking by colliding with the guide cone surface 901 of the locking nut 9.

[0040] Furthermore, a second elastic element is provided inside the second housing; the locking nut 9 is floatingly disposed inside the second housing via the second elastic element; the second elastic element is arranged axially along the locking nut; the second structural part 92 passes through the second elastic element. One end of the second elastic element abuts against the end face of the first structural part 91 near the second structural part, and the other end abuts against the second housing. The second elastic element is a nut preload spring 11. Under the elastic force of the second elastic element, the end face of the first structural part 91 of the locking nut 9 away from the second structural part 92 abuts against the nut mounting plate 8. A washer 10 is installed between the locking nut 9 and the nut preload spring 11, and the nut preload spring 11 is installed between the washer 10 and the bottom wall of the second housing. The nut preload spring 11 provides a clamping force between the locking nut 9 and the nut mounting plate 8.

[0041] Furthermore, the outer peripheral surface of the third structural part 93 is formed with a second external thread; the adjustment structure includes a limiting adjustment hole 121 opened on the bottom wall of the second housing, an adjustment shim 13 for cooperating with the limiting adjustment hole 121, and a threaded component for screwing into the second external thread; the threaded component is specifically a fixing nut 14. The adjustment shim 13 includes a protrusion that is clearance-fitted with the limiting adjustment hole 121; the third structural part 93 extends out of the limiting adjustment hole 121 to the outside of the second housing; the limiting adjustment hole 121 is a prismatic hole, the corners 122 of the limiting adjustment hole 121 are arc-shaped, and the protrusions are two cylinders 131 that are clearance-fitted with the two arc-shaped corners 122. The adjustment shim 13 is installed at the bottom of the second housing. After the adjusting shim 13 is installed, the fixing nut 14 is fixedly connected to the locking nut 9 by threads, and is used to fix the axial position of the locking nut 9. A rhomboid-shaped limiting adjustment hole 121 is made at the bottom of the nut housing 12, and the third structural part 93 of the locking nut 9 passes through the rhomboid-shaped limiting adjustment hole 121. The adjusting shim 13 has two protruding cylinders 131, which are inserted into the rounded corners 122 on both sides of the rhomboid-shaped limiting adjustment hole 121. The fixing nut 14 is threadedly connected to the third structural part 93 of the locking nut 9 to fix the position of the locking nut 9.

[0042] In the above embodiment, the adjustment structure further includes a second annular boss 801 formed on the side of the nut mounting plate 8 near the locking nut 9 and an annular mating arc surface 902 disposed on the outer periphery of the first structural part 91; the inner diameter of the second annular boss 801 is larger than the diameter of the through hole 802. The annular mating arc surface 902 presents an outwardly convex arc shape in any cross section in the axial direction, and the first structural part 91 is located inside the second annular boss 802 and is clearance-fitted with the inner surface of the second annular boss 801 through the annular mating arc surface 902. Specifically, the inner end face of the nut mounting plate 8 has a second annular boss 801, which mates with the locking nut 9 and defines the circumferential position of the locking nut 9. There is an adjustment gap between the protruding cylinder 131 on the adjusting shim 13 and the two sides of the rhomboid limiting adjustment hole 121 at the bottom of the nut housing 12; the annular mating arc surface 902 on the locking nut 9 is in clearance fit with the second annular boss 801, thereby allowing the relative posture of the locking nut 9 to be appropriately adjusted. This reduces the positioning accuracy requirements of the locking and releasing mechanism.

[0043] More specifically, the radial cross-sectional diameter of the first structural part 91 is greater than the radial cross-sectional diameter of the second structural part 92, the radial cross-sectional diameter of the first structural part 91 is not greater than the inner diameter of the second annular boss 801, and the radial cross-sectional diameter of the first structural part 91 is not less than the diameter of the through hole 802.

[0044] In one specific embodiment, the bolt mounting plate 1 further includes an outwardly protruding first annular boss 102 formed on the other side of the bolt mounting plate 1; the first threaded hole 101 is coaxially arranged with the first annular boss 102; the outer diameter of the first annular boss 102 is equal to the inner diameter of the through hole 802. When the moving bolt 3 is locked with the locking nut 9, the first annular boss 102 can be embedded in the through hole 802. The height of the first annular boss 102 is equal to the thickness of the nut mounting plate 8. Through the engagement of the first annular boss 102 on the front end face of the bolt mounting plate 1 with the through hole 802 in the center of the nut mounting plate 8, an effective shear-resistant structure can be formed after the mechanism is locked, significantly improving the overall rigidity and stability of the connection interface. That is, the diameter of the through hole 802 in the center of the nut mounting plate 8 is equal to the maximum diameter of the guide cone hole on the locking nut 9. The bolt mounting plate 1 has a first annular boss 102 on its front end face. The outer diameter of the first annular boss 102 is equal to the diameter of the through hole 802 in the center of the nut mounting plate 8, and the height of the first annular boss 102 is consistent with the thickness of the nut mounting plate 8. After the bolt mounting plate 1 and the nut mounting plate 8 are locked together by the moving bolt 3 and the locking nut 9, the first annular boss 102 on the front end face of the bolt mounting plate 1 contacts the inner surface of the through hole 802 in the center of the nut mounting plate 8, thereby improving the connection rigidity.

[0045] The locking and releasing mechanism of the present invention operates as follows: After the driver 6 operates, it drives the rotating drum 5 to rotate. The rotating drum 5 drives the moving bolt 3 to rotate through a spline structure. A threaded hole 101 is provided in the center of the bolt mounting plate 1, which is connected to the threaded section 302 of the moving bolt 3. Through threaded transmission, the moving bolt 3 can move axially while rotating, engaging with the locking nut 9. When locking is required, the driver 6 rotates forward, and the moving bolt 3 moves forward while rotating, connecting with the locking nut 9. When unlocking is required, the driver 6 rotates in reverse, and the moving bolt 3 moves backward while rotating, disengaging from the locking nut 9.

[0046] The large-tolerance guiding method of the locking and releasing mechanism of the present invention is suitable for situations where the pre-locking encapsulated bolt assembly is only subjected to axial force, and other directions are in a follow-up state. When there is a certain relative positional deviation between the pre-locking encapsulated bolt assembly and the encapsulated nut assembly, the guide rod segment 301 of the moving bolt 3 corrects its position by colliding with the guide cone surface 901 of the locking nut 9. With the axial force, the guide rod segment 301 enters the internal thread hole 903 from the guide cone surface 901 of the locking nut 9. At this time, the relative positional deviation between the moving bolt 3 and the locking nut 9 meets the positioning accuracy requirements of the bolt and nut fit, and the locking process can begin. The posture adaptation method of the locking and releasing mechanism of the present invention is suitable for situations where multiple sets of repeatable locking and releasing mechanisms need to be installed on the same panel, and the relative positional accuracy of a single set of locking and releasing mechanisms cannot meet the requirements due to machining, assembly, and other errors. Specifically, there is an adjustment gap between the protruding cylinder 131 on the adjusting shim 13 and the arc-shaped corners 122 on both sides of the rhomboid limiting adjustment hole 121 at the bottom of the nut housing 12. The annular mating arc surface 902 on the locking nut 9 can be appropriately adjusted within the second annular boss 801 of the nut mounting plate 8, thereby reducing the positioning accuracy requirements of the locking and releasing mechanism.

[0047] In summary, the present invention provides a repetitive locking and releasing mechanism comprising a sealed bolt assembly and a sealed nut assembly; the sealed bolt assembly includes a bolt mounting plate, a movable bolt screwed onto the bolt mounting plate, and a driving structure for driving the movable bolt to rotate and move along the axial direction of the movable bolt on the bolt mounting plate; the sealed nut assembly includes a housing, a locking nut floatingly disposed within the housing, and an adjustment structure connecting the housing and the locking nut; the housing has a through hole; one end of the locking nut for engaging with the movable bolt is exposed through the through hole; the movable bolt includes a threaded rod segment and a guide rod segment; the locking nut includes a guide cone surface for engaging with the guide rod segment and an internal threaded hole for screwing with the threaded rod segment; the adjustment structure is configured such that when the movable bolt moves toward the locking nut under the drive of the driving structure, the contact force between the guide rod segment and the guide cone surface drives the locking nut to adjust its posture, so that the threaded rod segment and the internal threaded hole are coaxially aligned to achieve helical locking of the movable bolt and the locking nut. This invention utilizes the cooperation between the guide rod segment at the front end of the moving bolt and the guide cone surface of the locking nut. This allows the mechanism to automatically correct the relative positional deviation between the moving bolt and the locking nut during the initial locking stage, achieving a smooth transition from coarse guidance to fine mating, significantly reducing the stringent requirements for initial mating accuracy. The core locking mechanism of this invention employs a classic bolt-nut pair transmission, providing high locking force, high connection rigidity and strength, and reliable operation. Furthermore, it features a simple structure, mature technology, and controllable manufacturing costs. The floating design of the locking nut, combined with an adjustment structure, allows for relative posture adjustment between the locking nut and the moving bolt during locking. When multiple sets of this invention's mechanisms are installed in parallel on the same mating surface, they effectively absorb and compensate for cumulative errors caused by processing, assembly, and deformation, ensuring reliable locking at all connection points and significantly reducing the requirements for positioning and installation accuracy. The mechanism of this invention is clearly divided into two independent functional modules: a sealing bolt assembly and a sealing nut assembly. This design facilitates rapid replacement and maintenance.

[0048] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A repeatable locking and releasing mechanism, characterized in that, include: Encapsulated bolt assemblies and encapsulated nut assemblies; The encapsulated bolt assembly includes a bolt mounting plate, a movable bolt screwed onto the bolt mounting plate, and a drive structure for driving the movable bolt to rotate and move along the axial direction of the movable bolt on the bolt mounting plate. The encapsulated nut assembly includes a housing, a locking nut floating within the housing, and an adjustment structure connecting the housing and the locking nut; the housing has a through hole; one end of the locking nut for engaging with a moving bolt is exposed through the through hole; The moving bolt includes a threaded rod segment and a guide rod segment, and the locking nut includes a guide cone surface for cooperating with the guide rod segment and an internal threaded hole for screwing into the threaded rod segment; The adjustment structure is configured such that when the moving bolt moves toward the locking nut under the drive of the drive structure, the contact force between the guide rod segment and the guide cone surface drives the locking nut to adjust its posture, so that the threaded rod segment is coaxially aligned with the internal threaded hole to achieve helical locking of the moving bolt and the locking nut.

2. The repeatable locking and releasing mechanism according to claim 1, characterized in that, The drive structure includes a first housing with one open end, a driver fixed inside the first housing, and a rotating cylinder connected to the drive shaft of the driver and disposed inside the first housing; the inner wall of the rotating cylinder has an internal spline structure, and the moving bolt also includes a mating section connected to the end of the threaded rod segment away from the guide rod segment, and the mating section has an external spline structure that is embedded in the internal spline structure; the open end of the first housing is fixed to one side of the bolt mounting plate.

3. The repeatable locking and releasing mechanism according to claim 2, characterized in that, The bolt mounting plate includes a first threaded hole for screwing into the threaded section of the moving bolt and an inwardly recessed groove formed on the side surface of the bolt mounting plate near the first housing; the first threaded hole and the groove are coaxially arranged; the drive structure also includes a bearing whose outer ring is fixed to the side wall of the groove; the inner ring of the bearing is fixed to the outer circumferential surface of the rotating cylinder.

4. The repeatable locking and releasing mechanism according to claim 3, characterized in that, The rotating drum includes a first elastic element arranged along the axial direction of the moving bolt; one end of the first elastic element is fixed to the top surface of the rotating drum, and the other end is fixed to the mating section of the moving bolt.

5. The repeatable locking and releasing mechanism according to claim 1, characterized in that, The outer casing includes a nut mounting plate and a second housing fixed to one side of the nut mounting plate; the through hole is formed on the nut mounting plate; the locking nut includes a first structural part, a second structural part, and a third structural part connected in sequence; a guide cone hole is formed in the first structural part, and the inner wall of the guide cone hole forms the guide cone surface; an internal thread hole is formed in the second structural part and communicates with the guide cone hole; a receiving hole is formed in the third structural part and communicates with the internal thread hole.

6. The repeatable locking and releasing mechanism according to claim 5, characterized in that, The second housing is provided with a second elastic element; the locking nut is floatingly disposed in the second housing through the second elastic element; the second elastic element is disposed along the axial direction of the locking nut; the second structural part passes through the second elastic element, one end of the second elastic element abuts against the first structural part, and the other end abuts against the second housing; the first structural part of the locking nut abuts against the nut mounting plate.

7. The repeatable locking and releasing mechanism according to claim 6, characterized in that, The outer peripheral surface of the third structural part is formed with a second external thread; the adjustment structure includes a limiting adjustment hole opened on the bottom wall of the second housing, an adjustment shim for cooperating with the limiting adjustment hole, and a threaded member for screwing into the second external thread; the adjustment shim includes a protrusion that is clearance-fitted with the limiting adjustment hole; the third structural part extends out of the second housing through the limiting adjustment hole; the limiting adjustment hole is a prismatic hole, the corner of the limiting adjustment hole is arc-shaped, and the protrusion is a cylinder that is clearance-fitted with the arc-shaped corner.

8. The repeatable locking and releasing mechanism according to claim 7, characterized in that, The adjustment structure further includes a second annular boss formed on the side of the nut mounting plate near the locking nut and an annular mating arc surface disposed on the outer periphery of the first structural part; the inner diameter of the second annular boss is larger than the diameter of the through hole; the annular mating arc surface is an outwardly convex arc shape in any cross section in the axial direction, and the first structural part is located inside the second annular boss and is clearance-fitted with the inner surface of the second annular boss through the annular mating arc surface.

9. The repeatable locking and releasing mechanism according to claim 8, characterized in that, The radial cross-sectional diameter of the first structural part is greater than that of the second structural part, the radial cross-sectional diameter of the first structural part is not greater than the inner diameter of the second annular boss, and the radial cross-sectional diameter of the first structural part is not less than the inner diameter of the through hole.

10. The repeatable locking and releasing mechanism according to claim 3, characterized in that, The bolt mounting plate also includes a first annular boss protruding outward on the other side of the bolt mounting plate; the first threaded hole and the first annular boss are coaxially arranged; the outer diameter of the first annular boss is equal to the inner diameter of the through hole; when the moving bolt and the locking nut are locked, the first annular boss can be embedded in the through hole.

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