Folding lifting lug mechanism

Abstract

The utility model relates to a folding lifting lug mechanism in the technical field of hanging flying objects, which comprises a U-shaped lifting lug, a base and a cavity wall plate, the bottom of the base is mounted in a cavity, the cavity wall plate corresponds to the outside of the top of the base, and the plate surface of the cavity wall plate is provided with a U-shaped notch formed by communicating a transverse strip hole and two longitudinal strip holes; the U-shaped lifting lug comprises a top transverse section and two vertical supporting sections connected to the two ends of the top transverse section respectively, the two vertical supporting sections are located in the two longitudinal strip holes of the U-shaped notch respectively, and the bottom ends of the vertical supporting sections are rotationally connected with the top of the base through rotating shafts in the direction of the top transverse section, so that the U-shaped notch can be plugged after the U-shaped lifting lug rotates and lies down from the external hanging state. The outer lug surface of the U-shaped lifting lug is consistent with the outer plate surface of the cavity wall plate; according to the folding lifting lug mechanism, the aerodynamic configuration can be optimized while the weight is lighter and the structure is simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of suspension and hoisting of suspended objects, in particular to a folding lug mechanism. Background Art

[0002] As is known, suspended objects are generally hung or hoisted on the airframe through lugs. After the suspended object is dropped or released from the hanging stage, the suspension function has been completed. If the lugs are still in the external hanging state, it not only looks obtrusive in terms of structure, but also increases the aerodynamic drag of the airframe. Therefore, traditionally, a folding technique is generally adopted to fold the lugs from the cavity opening into the cavity of the airframe, and then control the opening and closing plate to automatically close the cavity opening. The whole mechanism is very complex; the Chinese utility model patent with the publication number CN209386894U discloses a folding lug device, which can compensate for the aerodynamic shape only by the folding lugs and the structure of the airframe itself without using auxiliary structures such as covers and plates, thus simplifying the structure and control while meeting the aerodynamic requirements; however, the defect of the existing patent is that the whole lug is in a square frame shape, with a relatively heavy weight, and the rotation and folding are not flexible enough. The convex structure used to fill the lug hole is also directly arranged inside the airframe, occupying a large space. More importantly, when the lug stands up, both the frame-shaped hole left and the arc surface in the middle of the lug will increase the wind resistance to a certain extent. Summary of the Utility Model

[0003] In order to overcome the deficiencies in the background art and solve the existing technical problems, the utility model discloses a folding lug mechanism, which can be lighter and simpler in structure while optimizing the aerodynamic shape.

[0004] To achieve the above invention purpose, the utility model adopts the following technical scheme:

[0005] A folding lug mechanism includes a U-shaped lug, a base installed at the bottom inside the cavity, and a cavity wall plate corresponding to the outer top of the base. The plate surface of the cavity wall plate is provided with a U-shaped hole formed by connecting a horizontal strip hole and two vertical strip holes; the U-shaped lug includes a top horizontal section and two vertical support sections respectively connected to both ends of the top horizontal section. The two vertical support sections are respectively located in the two vertical strip holes of the U-shaped hole. The bottom end of the vertical support section is rotationally connected to the top of the base through a rotating shaft along the direction of the top horizontal section, so that the U-shaped lug can block the U-shaped hole after rotating and lying down from the external hanging state, and the outer ear surface of the U-shaped lug is flush with the outer plate surface of the cavity wall plate.

[0006] Furthermore, a torsion spring is sleeved on the rotating shaft. The two force arm sections of the torsion spring are respectively connected to the U-shaped lug and the base correspondingly, so that the U-shaped lug has a tendency to lie down.

[0007] Furthermore, when the U-shaped lug is in the lying state, the torsion spring still has the remaining force to inhibit the U-shaped lug from automatically bouncing up.

[0008] Furthermore, a central clamping block and two side blocks symmetrically arranged on both sides outside the central clamping block are fixed to the top of the base. The central clamping block and the side blocks are respectively provided with coaxial threaded holes and insertion holes. A rotating shaft is inserted into each insertion hole of the side blocks. A torsion spring is sleeved on the outer end shaft body of the rotating shaft. The inner end shaft body of the rotating shaft is provided with an external thread adapted to be screwed into the threaded hole. The bottom ends of the two vertical support sections of the U-shaped lifting lug are respectively inserted into the gaps between the two side blocks and the central clamping block in a corresponding movable manner, and the bottom ends of the vertical support sections are provided with rotating holes adapted to allow the corresponding shaft body of the rotating shaft to pass through.

[0009] Furthermore, a positioning screw hole vertically communicating with the insertion hole is provided on the outer wall of the side block. A positioning ring groove is provided on the shaft body of the rotating shaft corresponding to the positioning screw hole. A safety screw adapted to abut against the bottom of the positioning ring groove is screwed into the positioning screw hole.

[0010] Furthermore, a wear-resistant bushing is installed in the rotating hole.

[0011] Furthermore, a first limiting portion is formed by the extension of the side of the bottom end of the vertical support section corresponding to the outer ear surface of the U-shaped lifting lug. The base is provided with a second limiting portion capable of correspondingly abutting against the first limiting portion, so that the U-shaped lifting lug has a rotation limit from the lying state to the hanging state.

[0012] Furthermore, a limiting block for abutting against the inner ear surface of the U-shaped lifting lug in the lying state is provided in front of the base; a buffer pad is provided on the upper surface of the limiting block.

[0013] Furthermore, a detachable positioning plate for abutting against the inner ear surface of the U-shaped lifting lug in the hanging state is detachably installed on the outer plate surface of the cavity wall plate.

[0014] Furthermore, both the inner ear surface and the outer ear surface of the U-shaped lifting lug are provided as inclined surfaces capable of forming an angle with each other, and the rotation center of the rotating shaft deviates from the angular bisecting plane of the angle.

[0015] Due to the adoption of the above technical solution, the present utility model has the following beneficial effects:

[0016] The folding lifting lug mechanism disclosed by the present utility model uses a U-shaped lifting lug to block the U-shaped missing hole on the cavity wall plate, with a more corresponding structure. There is no need for an additional filling structure to occupy the cavity space, which can not only make the opening area of the cavity wall plate smaller, more convenient to manufacture, better retain the aerodynamic shape of the outer plate surface, better protect the inside of the cavity, but also make the U-shaped lifting lug itself lighter in weight and more flexible in rotation. The lower rotating part of the U-shaped lifting lug can also be better protected inside the cavity, reducing the maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a top view schematic diagram of the U-shaped lifting lug of the present utility model in the lying state;

[0018] Figure 2 It is a side view schematic diagram of the external hanging state of the U-shaped lifting lug of the present utility model;

[0019] Figure 3 It is a front view schematic diagram of the external hanging state of the U-shaped lifting lug of the present utility model;

[0020] Figure 4 It is a three-dimensional schematic diagram of the explosion structure of the present utility model.

[0021] In the figure: 1, cavity wall plate; 2, U-shaped notch; 3, U-shaped lifting lug; 301, outer ear surface; 302, inner ear surface; 303, first limiting part; 4, base; 5, rotating shaft; 6, side block; 7, safety screw; 8, limiting block; 9, central clamping block; 10, torsion spring. Specific embodiments

[0022] Next, the technical solutions of the present utility model will be described in conjunction with the drawings in the embodiments of the present utility model. In the description, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right", etc. indicating the orientation or positional relationship, it is only corresponding to the drawings of the present utility model. For the convenience of describing the present utility model, it does not indicate or imply that the device or element referred to must have a specific orientation:

[0023] Combined with the attached Figures 1-4The described folding lug mechanism includes a U-shaped lug 3, a base 4 installed at the bottom inside the cavity, and a cavity wall plate 1 corresponding to the outer wall of the top of the base 4. The plate surface of the cavity wall plate 1 is provided with a U-shaped notch 2 formed by the communication of a horizontal strip hole and two vertical strip holes. The U-shaped notch 2 can make the opening area of the cavity wall plate 1 smaller, more convenient to manufacture, the aerodynamic shape of the outer plate surface is retained more completely, and the protection of the inside of the cavity is better; the U-shaped lug 3 includes a top horizontal section and two vertical support sections respectively connected to both ends of the top horizontal section. The two vertical support sections are respectively located in the two vertical strip holes of the U-shaped notch 2. The bottom end of the vertical support section is rotationally connected to the top of the base 4 through a rotating shaft 5 along the direction of the top horizontal section, so that the U-shaped lug 3 can block the U-shaped notch 2 after rotating and lying down from the external hanging state, and the outer ear surface 301 of the U-shaped lug 3 is flush with the outer plate surface of the cavity wall plate 1. Whether the outer plate surface of the cavity wall plate 1 is a plane or a curved surface, the outer ear surface 301 of the U-shaped lug 3 can be designed to be consistent; as required, a first limiting portion 303 extends laterally from the bottom end of the vertical support section corresponding to the side of the outer ear surface 301 of the U-shaped lug 3, and the base 4 is provided with a second limiting portion that can correspondingly abut against the first limiting portion 303, so that the U-shaped lug 3 has a rotation limit from the lying-down state to the external hanging state. This limit can not only position the erected external hanging state of the U-shaped lug 3, generally erected at 90 degrees, but also increase the load in the direction of the abutment of the first limiting portion 303. In addition, a limiting block 8 is provided in front of the base 4 to abut against the inner ear surface 302 of the U-shaped lug 3 in the lying-down state. The limiting block 8 can position the lying-down state of the U-shaped lug 3. Specifically, a buffer pad can be provided on the upper surface of the limiting block 8 to slow down the vibration impact of the U-shaped lug 3 and avoid structural wear.

[0024] As required, a torsion spring 10 is sleeved on the rotating shaft 5. The two force arm sections of the torsion spring 10 are respectively connected to the U-shaped lug 3 and the base 4 correspondingly, so that the U-shaped lug 3 has a tendency to lie down. When the U-shaped lug 3 is mounted, it can be manually erected. After the mounting is released, under the action of the torsion spring 10, the U-shaped lug 3 can automatically lie down; when the U-shaped lug 3 is in the lying-down state, the torsion spring 10 still has the remaining force to inhibit the automatic bouncing of the U-shaped lug 3 under the inertial load of autonomous flight. When designing this remaining force, the movement state of the airframe needs to be considered to ensure that the lying-down U-shaped lug 3 will not be lifted due to airframe vibration or the influence of air flow in any direction. Generally, the U-shaped lugs 3 are designed in pairs, and the lying-down directions of the two U-shaped lugs 3 may be the same or opposite, may be with the wind or against the wind. In any case, the requirement of not automatically bouncing should be met; preferably, a central clamping block 9 and two side blocks 6 symmetrically arranged outside both sides of the central clamping block 9 are fixed on the top of the base 4. The central clamping block 9 and the side blocks 6 are respectively provided with coaxial threaded holes and jacks. The rotating shaft 5 is inserted into the jack of each side block 6. A torsion spring 10 is sleeved on the outer end shaft body of the rotating shaft 5. The inner end shaft body of the rotating shaft 5 is provided with an external thread adapted to be screwed into the threaded hole, generally a fine-threaded screw. The bottom ends of the two vertical support sections of the U-shaped lug 3 are respectively inserted into the gaps between the two side blocks 6 and the central clamping block 9 correspondingly, and the bottom ends of the vertical support sections are provided with rotating holes adapted to allow the corresponding shaft body of the rotating shaft 5 to pass through. While ensuring that the whole rotating structure is easy to install, the clamping of the U-shaped lug 3 by the side blocks 6 and the central clamping block 9 can be utilized to increase the load of the U-shaped lug 3 in the clamping direction. At the same time, the external pulling load of the U-shaped lug 3 can also be increased by increasing the diameter of the rotating shaft 5 and the wall thicknesses of the rotating holes, jacks and threaded holes; as required, a positioning screw hole vertically communicating with the jack is provided on the outer wall of the side block 6. The shaft body of the rotating shaft 6 corresponding to the positioning screw hole is provided with a positioning ring groove. A safety screw 7 adapted to abut against the bottom of the positioning ring groove is screwed into the positioning screw hole. The safety screw 7 can prevent the rotating shaft 5 from accidentally withdrawing from the threaded hole of the central clamping block 9. Of course, designing a abutting object on the outer end face of the rotating shaft 5 can also achieve the same effect; in addition, a wear-resistant bushing, such as a bushing made of tin bronze, is installed in the rotating hole to ensure smooth rotation while bearing the load.

[0025] As required, a detachable positioning plate for abutting against the inner ear surface 302 of the U-shaped lug 3 in the external hanging state is detachably installed on the outer plate surface of the cavity wall plate 1. Mainly during manual mounting, it is not necessary to always manually hold the U-shaped lug 3 to keep it in the vertical external hanging state, but the detachable positioning plate is used for abutting and positioning. After the mounting is completed, the detachable positioning plate is removed.

[0026] As required, both the inner ear surface 302 and the outer ear surface 301 of the U-shaped lug 3 are provided as inclined surfaces that can form an angle with each other, which is more in line with the lug standard and ensures the unchanged interface adaptability. Then, according to the preset lying-down direction of the U-shaped lug 3, the outer ear surface 301 is trimmed into a curved surface to meet the requirement of being flush with the fuselage curved surface after lying down. When both the inner ear surface 302 and the outer ear surface 301 are inclined surfaces, only when the rotation center of the design shaft 5 deviates from the angular bisecting plane of this angle can the rotation interference be avoided and the requirement that the U-shaped lug 3 plugs the U-shaped hole 2 be met.

[0027] When implementing the folding lug mechanism of the present utility model, after the U-shaped lug 3 is assembled and during mounting, it only requires manual rotation to lift the U-shaped lug 3, and then support it or use the detachable positioning plate to resist and keep the U-shaped lug 3 in an externally hung state, and then perform the mounting installation. When the hanging object is released during the flight of the aircraft, the U-shaped lug 3 can rotate and lie down to plug the U-shaped hole 2, and keep the aerodynamic shape of the aircraft smooth at this place.

[0028] The parts not detailed in the present utility model are prior art. For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the above embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model, and any reference signs in the claims should not be regarded as limiting the content of the claimed rights.

Claims

1. A folding lug mechanism, characterized in that: It includes a U-shaped lifting lug (3), a base (4) mounted at the bottom inside the cavity, and a cavity wall plate (1) corresponding to the outside of the top of the base (4). A U-shaped notch (2) formed by connecting a horizontal strip hole and two vertical strip holes is provided on the plate surface of the cavity wall plate (1); the U-shaped lifting lug (3) includes a top horizontal section and two vertical support sections respectively connected to both ends of the top horizontal section. The two vertical support sections are respectively located in the two vertical strip holes of the U-shaped notch (2). The bottom end of the vertical support section is rotationally connected to the top of the base (4) through a rotating shaft (5) along the direction of the top horizontal section, so that after the U-shaped lifting lug (3) rotates and lies down from the externally hung state, it can block the U-shaped notch (2), and the outer ear surface (301) of the U-shaped lifting lug (3) is flush with the outer plate surface of the cavity wall plate (1).

2. The folding lug mechanism according to claim 1, characterized in that: A torsion spring (10) is sleeved on the rotating shaft (5). The two force arm sections of the torsion spring (10) are respectively connected to the U-shaped lifting lug (3) and the base (4) correspondingly, so that the U-shaped lifting lug (3) has a tendency to lie down.

3. The folding lug mechanism according to claim 2, wherein: When the U-shaped lifting lug (3) is in the lying-down state, the torsion spring (10) still has the remaining force to inhibit the U-shaped lifting lug (3) from automatically bouncing up.

4. The folding lug mechanism according to claim 2, characterized in that: A central clamping block (9) is fixed on the top of the base (4), and two side blocks (6) are symmetrically arranged outside both sides of the central clamping block (9). The central clamping block (9) and the side blocks (6) are respectively provided with coaxial threaded holes and jacks. The rotating shaft (5) is inserted into the jack of each side block (6). A torsion spring (10) is sleeved on the outer end shaft body of the rotating shaft (5). The inner end shaft body of the rotating shaft (5) is provided with an external thread adapted to be screwed into the threaded hole. The bottom ends of the two vertical support sections of the U-shaped lifting lug (3) are respectively inserted into the gaps between the two side blocks (6) and the central clamping block (9) correspondingly, and the bottom ends of the vertical support sections are provided with rotating holes adapted to allow the corresponding shaft body of the rotating shaft (5) to rotate through.

5. The folding lug mechanism according to claim 4, characterized in that: A positioning screw hole vertically communicating with the jack is provided on the outer wall of the side block (6). A positioning ring groove is provided on the shaft body of the rotating shaft (6) corresponding to the positioning screw hole. A safety screw (7) adapted to abut against the bottom of the positioning ring groove is screwed into the positioning screw hole.

6. The folding lug mechanism according to claim 4, characterized in that: A wear-resistant bushing is installed in the rotating hole.

7. The folding lug mechanism according to claim 1, characterized in that: A first limiting portion (303) is formed by the lateral extension of the bottom end of the vertical support section corresponding to the side of the outer ear surface (301) of the U-shaped lifting lug (3). The base (4) is provided with a second limiting portion capable of correspondingly abutting against the first limiting portion (303), so that the U-shaped lifting lug (3) has a rotation limit from the lying-down state to the externally hung state.

8. The folding lug mechanism according to claim 1, characterized in that: A limiting block (8) for abutting against the inner ear surface (302) of the U-shaped lifting lug (3) when in the lying-down state is provided in front of the base (4); a buffer pad is provided on the upper surface of the limiting block (8).

9. The folding lug mechanism according to claim 1, characterized in that: A detachable positioning plate for abutting against the inner ear surface (302) of the U-shaped lifting lug (3) when in the externally hung state is detachably installed on the outer plate surface of the cavity wall plate (1).

10. The folding lug mechanism according to claim 1, characterized in that: Both the inner ear surface (302) and the outer ear surface (301) of the U-shaped lifting lug (3) are set as inclined surfaces capable of forming an angle with each other, and the rotation center of the rotating shaft (5) deviates from the angular bisecting plane of the angle.

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