Mechanical load limiter for relieving overload impact of unit load
Through the design of the energy-absorbing unit and locking rod of the mechanical load limiter, the movement and collision problems of the assembly load under overload impact are solved, effective energy absorption and rapid locking are achieved, and installation efficiency and safety are improved.
Patent Information
- Application Number
- CN202421773418.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-25
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-07-25
AI Technical Summary
The assembly load is damaged due to overload impact during flight, and existing tethers are prone to breaking or tearing under high load conditions.
A mechanical load limiter with a pair of adapter plates, energy-absorbing units, locking rods and universal hanging rings is adopted. The energy-absorbing unit absorbs impact energy through metal yield deformation during overload. The locking rod is quickly locked and unlocked. The universal hanging ring connects the load of the unit assembly to alleviate overload impact.
Effectively reduce overload impact, avoid load movement or collision damage, reduce the number of tied parts, improve installation efficiency, and is suitable for the constraints of heavy goods and equipment.
Smart Images
Figure CN223132363U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to airborne transportation safety, and particularly to a mechanical load limiter for reducing the overload impact of the crew load. Background Art
[0002] To ensure that the crew load will not move or be damaged by collision during transportation due to bumps, vibrations, etc., mooring parts such as mooring ropes, mooring chains, and mooring nets are generally used to restrain it. However, with the improvement of airlift capacity, the weights of the goods and equipment transported by air gradually increase. During the process of the aircraft climbing, diving, and turning, affected by the centrifugal force, the crew load will be subjected to great inertial forces in the forward, backward, left, right, and vertical directions. Since the greater the weight, the greater the inertial force, when the overload impact reaches a certain level, the rigid mooring ropes and mooring chains may break, and the flexible mooring ropes and mooring nets may be torn. Content of the Utility Model
[0003] The purpose of the utility model is to provide a mechanical load limiter for reducing the overload impact of the crew load, which can reduce the overload when the crew load is subjected to an overload impact and avoid the movement or collision damage of the crew load.
[0004] The technical solution adopted by the utility model is as follows:
[0005] A mechanical load limiter for reducing the overload impact of the crew load includes a pair of adapter plates, at least one set of energy absorption units arranged between the adapter plates, a locking rod arranged outside one of the adapter plates, and a universal hanging ring arranged outside the other adapter plate; the energy absorption units are used to be tensioned during an overload impact and absorb the impact energy through metal yield deformation, and both ends of the energy absorption units are hinged to the adapter plates respectively; one end of the locking rod is hinged to the corresponding adapter plate, and the other end is a hook that can be locked and unlocked, and the hook is used to connect to the body structure installation point; one end of the universal hanging ring is fixedly connected to the corresponding adapter plate, the middle is a universal joint structure, and the other end is a hanging ring, and the hanging ring is used to directly or connect to the crew load through mooring parts.
[0006] As one of the solutions, one set of energy absorption units is adopted, and the energy absorption units are located at the center position of the adapter plates.
[0007] As another one of the solutions, multiple sets of energy absorption units are adopted, and the energy absorption units are arranged in parallel and symmetrically distributed about the center of the adapter plates.
[0008] Preferably, the energy absorption unit includes a sleeve, an expansion tube located inside the sleeve, a first plug and a second plug respectively fitted at both ends of the expansion tube, and a first pull rod and a second pull rod respectively extending from both ends of the sleeve; the expansion tube is successively a wide-diameter section, a tapered section in transition, and a narrow-diameter section along the line, and the narrow-diameter section occupies most of the length of the expansion tube. The sleeve, the wide-diameter section, the first plug, and the first pull rod are fixedly connected together, and the sleeve, the narrow-diameter section, and the second plug are fixedly connected together. The second pull rod slidably passes through the second plug and is fixedly connected with a conical pull head. The extending ends of the first pull rod and the second pull rod are respectively provided with structures for hinging. Initially, the pull head is stuck in the tapered section, and the second pull rod abuts against the first pull rod or the first plug.
[0009] Further, the sleeve, the wide-diameter section, and the first plug are installed together by screws distributed circumferentially. The first pull rod is in threaded fit with the first plug and is locked by a nut.
[0010] Further, the narrow-diameter section and the second plug are installed together by screws distributed circumferentially, and the sleeve is fixedly welded to the second plug.
[0011] Preferably, the hinge points at both ends of the energy absorption unit are staggered at a 90-degree angle.
[0012] Preferably, an inner sleeve, an outer sleeve, a spring, and a limiting sleeve are provided near the hook on the locking rod. The inner sleeve is fixedly installed on the locking rod and has a flange on the outside. The outer sleeve is slidably sleeved on the inner sleeve and has a flange on the inside. The spring is located between the inner sleeve and the outer sleeve and abuts against the flanges of both at both ends. The limiting sleeve is slidably sleeved on the inner sleeve, one end is limited by the hook, and the other end is pressed by the spring through the outer sleeve. The limiting sleeve is provided with an opening groove. Initially, the movable part of the hook is restricted inside the limiting sleeve, and the movable part of the hook can only extend out from the opening groove when the limiting sleeve retracts and rotates to a certain angle to achieve unlocking.
[0013] Further, the inner sleeve is detachably fixedly installed on the locking rod through a loading and unloading sleeve. The front part of the inner sleeve is loosely sleeved on the locking rod, and the middle part is sleeved on the loading and unloading sleeve. The loading and unloading sleeve is inserted between the locking rod and the inner sleeve and is in interference fit with the inner sleeve.
[0014] Preferably, one end of the universal hanging ring is a base, the middle is a ball head rod, and the other end is a hanging ring. The base is fixed on the corresponding adapter plate. The ball head at one end of the ball head rod is spherically hinged to the base, and the other end is passed through by the hanging ring and welded to it.
[0015] Advantages of the utility model:
[0016] When the load of the unit is subjected to an overload impact, the limiter can utilize the energy absorption unit to absorb the impact energy, thereby reducing the overload and preventing the movement or collision damage of the unit load. Among them, the locking rod can be quickly locked and unlocked with the body structure, and the universal hanging ring can connect the unit load while not interfering with the constraint direction of the energy absorption unit. Moreover, since the limiter has the function of reducing overload, it can greatly reduce the number of associated mooring parts and improve the installation efficiency, and is applicable to the restraint of heavy goods and equipment. Brief Description of the Drawings
[0017] Figure 1 It is a schematic diagram of the mechanical load limiter for reducing the overload impact of the unit load in the embodiment of the present utility model.
[0018] Figure 2 It is a schematic diagram of the structure of the energy absorption unit in the embodiment of the present utility model.
[0019] Figure 3 It is a schematic diagram of the structure of the locking rod in the embodiment of the present utility model.
[0020] Figure 4 It is a schematic diagram of the structure of the universal hanging in the embodiment of the present utility model.
[0021] In the figure: 1 - locking rod; 11 - hook; 111 - movable part of the hook; 12 - limiting sleeve; 121 - opening groove; 13 - outer sleeve; 14 - inner sleeve; 15 - loading and unloading sleeve; 16 - spring; 2 - adapter plate; 3 - energy absorption unit; 31 - first pull rod; 32 - first plug; 33 - pull head; 34 - sleeve; 35 - expansion tube; 36 - second plug; 37 - second pull rod; 4 - universal hanging ring; 41 - base; 42 - ball head rod; 43 - hanging ring. Detailed Embodiment
[0022] The present utility model will be further described below in conjunction with the drawings and embodiments.
[0023] This embodiment discloses a mechanical load limiter for reducing the overload impact of the unit load. As Figures 1 to 4 shown, it includes a pair of adapter plates 2, at least one set of energy absorption units 3 arranged between the adapter plates 2, a locking rod 1 arranged outside one of the adapter plates 2, and a universal hanging ring 4 arranged outside the other adapter plate 2. Among them: The energy absorption unit 3 is used to be pulled during an overload impact and absorb the impact energy by metal yield deformation. As Figure 1 shown, its two ends are respectively hinged to the adapter plate 2. The energy absorption capacity and the specific number of the energy absorption unit 3 are selected according to the weight of the unit load. One set of energy absorption unit 3 can be adopted. At this time, the energy absorption unit 3 is located at the center of the adapter plate 2. As Figure 1 shown, or multiple sets of energy absorption units 3 can be adopted. At this time, the energy absorption units 3 are arranged side by side and symmetrically distributed about the center of the adapter plate 2; AsFigure 1 As shown, one end of the locking rod 1 is hinged to the corresponding adapter plate 2, and the other end is a hook 11 that can be locked and unlocked. The hook 11 is used to connect to the body structure mounting point; as Figure 1 shown, one end of the universal hanging ring 4 is fixedly connected to the corresponding adapter plate 2, the middle is a universal joint structure, and the other end is a hanging ring 43. The hanging ring 43 is used to directly or through a mooring member (mooring net, mooring chain, mooring rope, mooring belt, etc.) to connect the unit load.
[0024] Regarding the energy absorption unit 3, in this embodiment, preferably:
[0025] As Figure 2 shown, the energy absorption unit 3 includes a sleeve 34, an expansion tube 35 located inside the sleeve 34, a first plug 32 and a second plug 36 respectively fitted at both ends of the expansion tube 35, and a first pull rod 31 and a second pull rod 37 respectively extending from both ends of the sleeve 34; the expansion tube 35 is successively a wide-diameter section, a transitional tapered section, and a narrow-diameter section along the line. The narrow-diameter section occupies most of the length of the expansion tube 35 (at least half). The sleeve 34, the wide-diameter section, the first plug 32, and the first pull rod 31 are fixedly connected together. The sleeve 34, the narrow-diameter section, and the second plug 36 are fixedly connected together. The second pull rod 37 slidably passes through the second plug 36 and is fixedly connected with a conical pull head 33. The extending ends of the first pull rod 31 and the second pull rod 37 are respectively provided with structures for hinge (such as single earpiece, double earpiece). Initially, the pull head 33 is stuck in the tapered section, and the second pull rod 37 abuts against the first pull rod 31 or the first plug 32; during an overload impact, the energy absorption unit 3 in the opposite direction of the overload direction on the unit load is pulled. The second pull rod 37 drives the pull head 33 to move outward. The pull head 33 completely enters the narrow-diameter section and continuously expands the diameter, converting the external impact energy into the deformation energy of the narrow-diameter section, generating a large frictional force to absorb energy. The energy absorption capacity of the energy absorption unit 3 is determined by the sizes of the expansion tube 35 and the pull head 33. Just select the sizes of the expansion tube 35 and the pull head 33 according to the need of the energy absorption capacity.
[0026] Among them:
[0027] As Figure 2 shown, the sleeve 34, the wide-diameter section, and the first plug 32 can be installed together by circumferentially distributed screws. The first pull rod 31 can be threadedly fitted with the first plug 32 and locked by a nut, which is convenient and reliable for installation; as Figure 2 shown, the narrow-diameter section and the second plug 36 can be installed together by circumferentially distributed screws. The sleeve 34 can be fixedly welded to the second plug 36, which is convenient and reliable for installation; as Figure 1 and Figure 2 shown, the hinge points at both ends of the energy absorption unit 3 can be staggered at a 90-degree angle.
[0028] Regarding the locking rod 1, in this embodiment, preferably:
[0029] As Figure 3As shown in the figure, an inner sleeve 14, an outer sleeve 13, a spring 16 and a limit sleeve 12 are provided near the hook 11 on the locking rod 1. The inner sleeve 14 is fixedly installed on the locking rod 1 and has a flange on the outside. The outer sleeve 13 is slidably sleeved on the inner sleeve 14 and has a flange on the inside. The spring 16 is located between the inner sleeve 14 and the outer sleeve 13, and both ends thereof are respectively abutted against the flanges of the two. The limit sleeve 12 is slidably sleeved on the inner sleeve 14, one end is limited by the hook 11, and the other end is pressed by the spring 16 through the outer sleeve 13. An opening groove 121 is provided on the limit sleeve 12. Initially, the movable part 111 of the hook is restricted within the limit sleeve 12, and the movable part 111 of the hook can extend out of the opening groove 121 to achieve unlocking only when the limit sleeve 12 retreats and rotates to a certain angle; initially, the limit sleeve 12 is pressed by the spring 16 and will not retreat or rotate, and the locking is reliable. When unlocking, it is necessary to operate the limit sleeve 12 to complete two actions of retreating and rotating, and it will not be accidentally unlocked due to a single action. Both locking and unlocking only need to operate the limit sleeve 12, which is convenient for locking and unlocking.
[0030] Wherein:
[0031] As Figure 3 shown, the inner sleeve 14 can be detachably fixedly installed on the locking rod 1 through a loading and unloading sleeve 15. The front part of the inner sleeve 14 is loosely sleeved on the locking rod 1, and the middle part is sleeved on the loading and unloading sleeve 15. The loading and unloading sleeve 15 is inserted between the locking rod 1 and the inner sleeve 14 and is in interference fit with the inner sleeve 14. Inserting and pulling out the loading and unloading sleeve 15 can realize the installation and disassembly of the inner sleeve 14, which is relatively convenient.
[0032] Regarding the universal hanging ring 4, in this embodiment, preferably:
[0033] As Figure 4 shown, one end of the universal hanging ring 4 is a base 41, the middle is a ball head rod 42, and the other end is a hanging ring 43. The base 41 is fixed on the corresponding adapter plate 2. The ball head at one end of the ball head rod 42 is spherically hinged to the base 41, and the other end is passed through by the hanging ring 43 and welded thereto. It is convenient to manufacture and the connection is reliable.
[0034] From the above solutions, it can be seen that when the load of the unit is subjected to an overload impact, the shock absorber can absorb the impact energy by using the energy absorption unit 3, thereby reducing the overload and avoiding the movement or collision damage of the unit load. Among them, the locking rod 1 can be quickly locked and unlocked with the body structure. The universal hanging ring 4 can connect the unit load without interfering with the constraint direction of the energy absorption unit 3. Moreover, the shock absorber has the function of reducing the overload. Therefore, the number of associated mooring parts can be greatly reduced, the installation efficiency can be improved, and it is applicable to the restraint of heavy goods and equipment.
[0035] The embodiments described above are some, but not all, of the embodiments of the present application. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.
Claims
1. A mechanical load limiter for mitigating the overload impact of the unit load, characterized in that: It includes a pair of adapter plates, at least one set of energy absorption units arranged between the adapter plates, a locking rod arranged outside one of the adapter plates, and a universal hanging ring arranged outside the other adapter plate; the energy absorption units are used to be stretched during an overload impact and absorb the impact energy through metal yield deformation, and both ends of the energy absorption units are respectively hinged to the adapter plates; one end of the locking rod is hinged to the corresponding adapter plate, and the other end is a hook that can be locked and unlocked, and the hook is used to connect to the installation point of the airframe structure; one end of the universal hanging ring is fixedly connected to the corresponding adapter plate, the middle is a universal joint structure, and the other end is a hanging ring, and the hanging ring is used to directly or through a mooring member connect to the unit load.
2. The mechanical load limiter for reducing the overload impact of the unit load as claimed in claim 1, wherein: One set of energy absorption units is adopted, and the energy absorption units are located at the central position of the adapter plates.
3. The mechanical load limiter for reducing the overloading impact of the unit load as claimed in claim 1, wherein: Multiple sets of energy absorption units are adopted, and the energy absorption units are arranged in parallel and symmetrically distributed about the center of the adapter plates.
4. The mechanical load limiter for mitigating the overload impact of the unit load as claimed in claim 1, wherein: The energy absorption unit includes a sleeve, an expansion tube located inside the sleeve, a first plug and a second plug respectively fitted at both ends of the expansion tube, a first pull rod and a second pull rod respectively extending from both ends of the sleeve; the expansion tube is successively a wide-diameter section, a tapered section in transition, and a narrow-diameter section along the line, and the narrow-diameter section occupies most of the length of the expansion tube. The sleeve, the wide-diameter section, the first plug, and the first pull rod are fixedly connected together. The sleeve, the narrow-diameter section, and the second plug are fixedly connected together. The second pull rod slidably passes through the second plug and is fixedly connected with a conical pull head. The extending ends of the first pull rod and the second pull rod are respectively provided with structures for hinging. Initially, the pull head is stuck in the tapered section, and the second pull rod abuts against the first pull rod or the first plug.
5. The mechanical load limiter for mitigating the overloading impact of the unit load as claimed in claim 4, wherein: The sleeve, the wide-diameter section, and the first plug are installed together by circumferentially distributed screws. The first pull rod is threadedly fitted with the first plug and locked by a nut.
6. The mechanical load limiter for mitigating the overload impact of the unit load as claimed in claim 4, wherein: The narrow-diameter section and the second plug are installed together by circumferentially distributed screws, and the sleeve is fixedly welded to the second plug.
7. The mechanical load limiter for reducing the overload impact of the unit load as described in any one of claims 1 to 6, characterized in that: The hinge points at both ends of the energy absorption unit are staggered at a 90-degree angle.
8. The mechanical load limiter for reducing the overload impact of the unit load as claimed in claim 1, characterized in that: An inner sleeve, an outer sleeve, a spring, and a limit sleeve are arranged near the hook on the locking rod. The inner sleeve is fixedly installed on the locking rod and has a flange on the outside. The outer sleeve is slidably sleeved on the inner sleeve and has a flange on the inside. The spring is located between the inner sleeve and the outer sleeve and abuts against the flanges of both at both ends. The limit sleeve is slidably sleeved on the inner sleeve. One end is limited by the hook, and the other end is pressed by the spring through the outer sleeve. An opening groove is provided on the limit sleeve. Initially, the movable part of the hook is restricted inside the limit sleeve, and the movable part of the hook can only extend out of the opening groove to achieve unlocking when the limit sleeve retracts and rotates to a certain angle.
9. The mechanical load limiter for reducing the overloading impact of the unit load as claimed in claim 8, wherein: The inner sleeve is detachably fixedly installed on the locking rod through a loading and unloading sleeve. The front part of the inner sleeve is loosely sleeved on the locking rod, and the middle part is sleeved on the loading and unloading sleeve. The loading and unloading sleeve is inserted between the locking rod and the inner sleeve and has an interference fit with the inner sleeve.
10. The mechanical load limiter for mitigating the overload impact of the unit load as claimed in claim 1, wherein: One end of the universal hanging ring is a base, the middle is a ball head rod, and the other end is a hanging ring. The base is fixed on the corresponding adapter plate. The ball head at one end of the ball head rod is spherically hinged to the base, and the other end is passed through by the hanging ring and welded to it.