Small-space large-stroke two-stage aviation lifting mechanism

Abstract

The invention relates to a small-space large-stroke two-stage aviation lifting mechanism, and belongs to the field of aviation lifters, the small-space large-stroke two-stage aviation lifting mechanism comprises a first-stage lifting mechanism, a second-stage lifting mechanism, a transmission mechanism and a driving system, and the first-stage lifting mechanism and the second-stage lifting mechanism adopt a nested structural design and share one servo motor; through cooperation of the transmission shaft, the chain wheel assembly and the lead screw assembly, the two-stage lifting plate drives the load to ascend and descend synchronously, and the lifting mechanism has the advantages of being small in height occupied space, large in stroke, high in reliability and low in cost and is particularly suitable for existing lifting mechanism schemes of aviation airborne photoelectricity, radar and other loads.

Description

Technical Field

[0001] The present invention relates to the field of aviation elevators, and particularly to a two-stage aviation lifting mechanism with a large stroke in a small space. Background Art

[0002] The lifting mechanism for aviation is mainly used to realize the lifting function of aircraft-related loads during the mission execution of the aircraft; due to the limitations of the airborne installation and use environment, the aviation elevator is different from other common elevators, and its design requirements are relatively strict, and multiple factors need to be considered: on the one hand, due to the limited airborne space, for the lifting of some special loads, it is required to have a large stroke while hoping to occupy a small space. Therefore, it is required that the aviation elevator can achieve a large lifting stroke in a small space as much as possible; on the other hand, the aircraft will generate severe vibrations during flight, and the aviation elevator needs to have sufficient stiffness and strong anti-vibration ability; on the other hand, the lifting of the aviation elevator needs to be realized by a corresponding control system. The more complex the structure is, the more it will increase the complexity of the control system and the failure rate will increase. Therefore, it is required that its structure is as simple as possible and has high reliability; at the same time, on the premise of meeting the above requirements, the cost should be reduced as much as possible.

[0003] Currently, the lifting method that is widely used in aviation elevators mainly realizes the lifting of the load mounting plate through the combination of a servo motor, a sprocket, and a lead screw nut. The servo motor transmits power to the lead screw or nut through the sprocket to drive the load mounting plate to lift. In this method, the stroke of the load mounting plate is less than the height space of the lifting mechanism. If a large stroke is to be achieved, it will result in a large size in the height direction of the mechanism, and it is difficult to meet the requirements of small space and large stroke for airborne loads.

[0004] To solve the problem of large stroke in a small space, in the prior art, in other application scenarios, a two-stage or multi-stage lifting structure is adopted. Although it can save space to a certain extent, it generally has problems such as complex structure and low reliability, and still cannot meet the requirements of high stiffness, high reliability, and low cost of the aviation elevator; due to the existence of two-stage lifting plates, there are many moving parts, and it is difficult to layout the drive and transmission systems. Usually, two motors need to be set up with a transmission system to realize the lifting of the two-stage lifting mechanism. There are many components and the structure is complex. The two motors need to be controlled separately, resulting in a complex control system, low reliability, and increased system cost. In addition, the unreasonable layout of the drive system and the transmission system will further occupy the space in the vertical direction and still cannot well meet the use requirements of the aviation elevator. Summary of the Invention

[0005] Aiming at the defects of the prior art, the present invention proposes a two-stage aviation lifting mechanism with a large stroke in a small space to meet the use requirements of airborne lifting loads.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: A two-stage aviation lifting mechanism with a small space and a large stroke, comprising a first-stage lifting mechanism, a second-stage lifting mechanism, a transmission mechanism and a drive system. The first-stage lifting mechanism includes a first-stage lifting frame, a first-stage lifting plate and a first-stage lead screw assembly. The first-stage lifting plate is arranged in the first-stage lifting frame in a liftable manner through the first-stage lead screw assembly. The second-stage lifting mechanism includes a second-stage lifting frame, a second-stage lifting plate and a second-stage lead screw assembly. The second-stage lifting frame is nested in the first-stage lifting frame, and the first-stage lifting plate serves as the top plate of the second-stage lifting frame at the same time. The second-stage lifting plate is arranged in the second-stage lifting frame in a liftable manner through the second-stage lead screw assembly. The second-stage lifting plate is used to connect the load. The drive system is arranged on the second-stage lifting frame. The transmission mechanism includes a transmission shaft, a first-stage sprocket assembly and a second-stage sprocket assembly. The power of the drive system is transmitted to the first-stage sprocket assembly and the second-stage sprocket assembly respectively through the transmission shaft. The first-stage sprocket assembly and the first-stage lead screw assembly are coaxially arranged, and the second-stage sprocket assembly and the second-stage lead screw assembly are coaxially arranged, so as to realize the synchronous lifting of the first-stage lifting plate and the second-stage lifting plate.

[0007] Further, the drive system is a servo motor. The servo motor and the transmission shaft are arranged on the second-stage lifting frame in parallel with each other and are driven by gears therebetween. A first-stage driving sprocket is fixed to the upper end of the transmission shaft. The first-stage driving sprocket is connected to the first-stage sprocket assembly through a first-stage chain. A second-stage driving sprocket is fixed to the lower end of the transmission shaft. The second-stage driving sprocket is connected to the second-stage sprocket assembly through a second-stage chain.

[0008] Further, a motor sleeve is arranged outside the servo motor. The lower end of the motor sleeve is fixed to the second-stage lifting frame. A driving gear is fixed to the upper end of the output shaft of the servo motor. A driven gear meshing with the driving gear is also fixed to the upper end of the transmission shaft. The driven gear and the first-stage driving sprocket form a dual structure and are rotatably supported on the second-stage lifting frame. The second-stage driving sprocket at the lower end of the transmission shaft is rotatably supported on the second-stage lifting frame.

[0009] Further, the first-stage lifting frame includes a first-stage top plate, a first-stage bottom plate and first-stage support plates. The first-stage support plates are vertically connected between the first-stage top plate and the first-stage bottom plate. The first-stage lifting plate is located between the first-stage top plate and the first-stage bottom plate. The second-stage lifting frame includes a second-stage top plate, a second-stage bottom plate and second-stage support plates. The second-stage top plate is the first-stage lifting plate. The second-stage support plates are vertically connected between the second-stage top plate and the second-stage bottom plate. The second-stage lifting plate is located between the second-stage top plate and the second-stage bottom plate.

[0010] Further, the first-level lead screw assembly includes multiple groups of first-level lead screws and first-level nuts that are in threaded fit. The upper and lower ends of multiple first-level lead screws are respectively fixed on the first-level top plate and the first-level bottom plate. One first-level nut is sleeved on each first-level lead screw. The first-level nut is rotatably connected to the first-level lifting plate and can drive the first-level lifting plate to move up and down. The second-level lead screw assembly includes multiple groups of second-level lead screws and second-level nuts that are in threaded fit. The upper and lower ends of multiple second-level lead screws are respectively rotatably supported on the second-level top plate and the second-level bottom plate. One second-level nut is sleeved on each second-level lead screw. The second-level nut is fixedly connected to the second-level lifting plate.

[0011] Further, both the first-level top plate and the first-level bottom plate are of hollow design, so that the second-level lifting frame can be retracted into the first-level lifting frame. Both the second-level top plate and the second-level bottom plate are of hollow design to avoid the load. One side of the first-level bottom plate is designed to be open to avoid the transmission shaft.

[0012] Further, the first-level lead screw assembly includes four first-level lead screws, and the four first-level lead screws are evenly distributed around the first-level lifting frame. The second-level lead screw assembly includes four second-level lead screws, and the four second-level lead screws are evenly distributed around the second-level lifting frame and are located inside the first-level lead screw assembly.

[0013] Further, the first-level sprocket assembly includes the same number of first-level driven sprockets as the first-level lead screws. The first-level driven sprockets are arranged below the first-level lifting plate and are coaxially and fixedly connected to the first-level nuts. The second-level sprocket assembly includes the same number of second-level driven sprockets as the second-level lead screws. The second-level driven sprockets are arranged below the second-level bottom plate and are coaxially and fixedly connected to the second-level lead screws.

[0014] Further, the first-level chain is arranged around multiple first-level driven sprockets, and the first-level driving sprocket is located outside the first-level chain and presses the first-level chain.

[0015] Further, the second-level chain is arranged around the second-level driving sprocket and multiple second-level driven sprockets. Both the second-level driving sprocket and the second-level driven sprockets are located inside the second-level chain, and the second-level driving sprocket tensions the second-level sprockets outward.

[0016] Beneficial effects: The two-stage aviation lifting mechanism of the present invention adopts a nested frame structure, with the second-level lifting frame serving as the lifting frame of the first-level lifting mechanism and being lifted as a whole by the first-level lifting mechanism. When retracting, it can be retracted into the first-level lifting frame. When both two-stage lifting mechanisms descend, the stroke is equal to the sum of the stroke of the first-level lifting plate and the stroke of the second-level lifting plate. It has the characteristics of small height occupied space and large stroke. At the same time, the frame structure effectively reduces the weight of the mechanism, and is particularly suitable for the lifting mechanism solutions of current aviation airborne optoelectronics, radar and other loads.

[0017] Based on the nested two - stage lifting frame, the present invention ingeniously designs the drive system and transmission mechanism. By using only one set of power systems, two groups of sprockets are driven by a synchronous rotating shaft, realizing the synchronous lifting of the two - stage lifting mechanism, effectively reducing the structural complexity. The simplification of the structural design simultaneously reduces the difficulty and complexity of the control system. Through the reasonable ratio of the traditional system, controlling one set of servo motors can make the two - stage lifting mechanism lift synchronously at different strokes and different speeds, making the lifting mechanism have high reliability and low failure rate.

[0018] The present invention uses a servo motor and a transmission shaft, with chain drive and a lead screw - nut for lifting. The entire transmission system is stable, reliable and compact, enabling the system to have good anti - vibration and shock resistance while having sufficient stiffness, and meeting the special requirements of airborne lifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the overall structure of the present invention (descending state); Figure 2 For Figure 1 Partial cross - sectional view; Figure 3 Schematic diagram of the structure of the present invention in the retracted state.

[0020] Reference numerals: 10 primary lifting mechanism, 11 primary top plate, 12 primary bottom plate, 13 primary support plate, 14 primary lifting plate, 15 primary lead screw, 16 primary nut, 17 primary driven sprocket, 18 primary chain, 19 locking nut; 20 secondary lifting mechanism, 21 secondary top plate, 22 secondary bottom plate, 23 secondary support plate, 24 secondary lifting plate, 25 secondary lead screw, 26 secondary nut, 27 secondary driven sprocket, 28 secondary chain, 29 secondary lower slewing bearing assembly; 30 servo motor, 31 driving gear; 40 transmission shaft, 41 driven gear, 42 primary driving sprocket, 43 secondary driving sprocket; 50 load. DETAILED DESCRIPTION OF THE INVENTION

[0021] The following further elaborates on the present invention in detail with reference to the drawings and specific embodiments.

[0022] As Figures 1-3 shown, a two - stage aviation lifting mechanism with a large stroke in a small space includes a primary lifting mechanism 10, a secondary lifting mechanism 20, a transmission mechanism and a drive system, mainly used for installing on an aircraft to realize the lifting function of the corresponding load. It adopts a nested structure design and a single - drive method, has high reliability, and can achieve double the lifting stroke on the premise of a certain retracted space.

[0023] The primary lifting mechanism 10 includes a primary lifting frame, a primary lifting plate 14 and a primary lead screw assembly; As Figure 1As shown, the first-level lifting frame includes a first-level top plate 11, a first-level bottom plate 12, and a first-level support plate 13. The first-level support plate 13 is vertically connected between the first-level top plate 11 and the first-level bottom plate 12 by screw fasteners. Both the first-level top plate 11 and the first-level bottom plate 12 are of hollow design, and the three form a frame structure. The first-level top plate 11 is designed with an interface for connecting to the aircraft while serving as the top support plate of the lifting mechanism, enabling the entire lifting mechanism to be docked with the aircraft. The first-level lifting plate 14 is vertically arranged between the first-level top plate 11 and the first-level bottom plate 12 of the first-level lifting frame through a first-level screw assembly.

[0024] The first-level screw assembly includes multiple groups of screw-matched first-level screws 15 and first-level nuts 16. In this embodiment, the first-level screw assembly includes four first-level screws 15, which are distributed around the first-level lifting frame. The upper and lower ends of the four first-level screws 15 are respectively fixed on the first-level lifting frame. Specifically, the upper end of the first-level screw 15 is connected to the first-level top plate 11 by screws, and the lower end of the first-level screw 15 is connected to the first-level bottom plate 12 by a locking nut 19. A first-level nut 16 is sleeved on each first-level screw 15. The first-level nut 16 is rotatably connected to the first-level lifting plate 14 through a bearing assembly and can drive the first-level lifting plate 14 to move up and down. In the first-level lifting mechanism 10, the first-level screw 15 does not rotate, and the first-level lifting plate 14 is driven to move up and down by the rotation of the first-level nut 16.

[0025] The second-level lifting mechanism 20 includes a second-level lifting frame, a second-level lifting plate 24, and a second-level screw assembly. The second-level lifting frame includes a second-level top plate 21, a second-level bottom plate 22, and a second-level support plate 23. The second-level support plate 23 is vertically connected between the second-level top plate 21 and the second-level bottom plate 22. The second-level top plate 21 is the first-level lifting plate 14. The second-level lifting frame is nested in the first-level lifting frame, and the first-level lifting plate 14 simultaneously serves as the second-level top plate 21 of the second-level lifting frame, enabling the second-level lifting frame to be lifted as a whole by the first-level lifting mechanism 10. The second-level lifting plate 24 is used to connect the load 50. Both the second-level top plate 21 and the second-level bottom plate 22 are of hollow design to avoid the load 50. The second-level lifting plate 24 is vertically arranged between the second-level top plate 21 and the second-level bottom plate 22 of the second-level lifting frame through a second-level screw assembly.

[0026] The secondary lead screw assembly includes multiple groups of second lead screws 25 and second nuts 26 that are in threaded fit. In this embodiment, there are four second lead screws 25, which are distributed around the secondary lifting frame and are located inside the primary lead screw assembly. The upper and lower ends of the four second lead screws 25 are respectively rotatably supported on the secondary top plate 21 and the secondary bottom plate 22 through bearing assemblies. A second nut 26 is sleeved on each second lead screw 25, and the second nut 26 is fixedly connected to the secondary lifting plate 24. In the secondary lifting mechanism 20, the second nut 26 is fixed to the secondary lifting plate 24, and the second lead screw 25 rotates to drive the secondary lifting plate 24 to move up and down.

[0027] The drive system is a single set of servo motor 30, which is installed on the secondary lifting frame. The transmission mechanism includes a transmission shaft 40, a primary sprocket assembly, and a secondary sprocket assembly. The primary sprocket assembly is coaxially arranged with the primary lead screw assembly, and the secondary sprocket assembly is coaxially arranged with the secondary lead screw assembly. The power output by the servo motor 30 is transmitted to the primary sprocket assembly and the secondary sprocket assembly through the transmission shaft 40 respectively. The primary sprocket assembly drives the primary lead screw assembly, and the secondary sprocket assembly drives the secondary lead screw assembly to realize the synchronous lifting of the primary lifting plate 14 and the secondary lifting plate 24 respectively.

[0028] Specifically, as Figure 2 shown, the servo motor 30 and the transmission shaft 40 are arranged parallel to each other on the secondary lifting frame. One side of the primary bottom plate 12 is designed to be open to avoid the servo motor 30 and the transmission shaft 40. An outer motor sleeve is provided outside the servo motor 30, and the lower end of the motor sleeve is fixed to the secondary bottom plate 22 of the secondary lifting frame. A driving gear 31 is fixed to the upper end of the output shaft of the servo motor 30, and a driven gear 41 is fixed to the upper end of the transmission shaft 40. The power transmission is realized through the meshing of the driving gear 31 and the driven gear 41.

[0029] Furthermore, a primary driving sprocket 42 is fixed to the upper end of the transmission shaft 40, and a secondary driving sprocket 43 is fixed to the lower end of the transmission shaft 40. The driven gear 41 and the primary driving sprocket 42 form a double-link structure, which is fixed to the upper end of the transmission shaft 40 and is rotatably supported on the secondary top plate 21 (i.e., the primary lifting plate 14) through a bearing assembly. The secondary driving sprocket 43 is fixed to the lower end of the transmission shaft 40 and is rotatably supported on the secondary bottom plate 22 through a secondary lower slewing support assembly 29 (including a secondary sprocket shaft, bearings, etc.).

[0030] Specifically, the first-stage sprocket assembly includes the same number of first-stage driven sprockets 17 as the first-stage lead screws 15, that is, each first-stage lead screw 15 corresponds to one first-stage driven sprocket 17. The first-stage driven sprockets 17 are rotatably arranged below the first-stage lifting plate 14 through bearing assemblies and are coaxially and fixedly connected to the first-stage screw sleeves 16. The first-stage driving sprocket 42 is connected to multiple first-stage driven sprockets 17 through a first-stage chain 18. The second-stage sprocket assembly includes the same number of second-stage driven sprockets 27 as the second-stage lead screws 25, that is, each second-stage lead screw 25 corresponds to one second-stage driven sprocket 27. The second-stage driven sprockets 27 are rotatably arranged below the second-stage bottom plate 22 through bearing assemblies and are coaxially and fixedly connected to the second-stage lead screws 25. The second-stage driving sprocket 43 is connected to multiple second-stage driven sprockets 27 through a second-stage chain 28.

[0031] In this embodiment, by cleverly arranging the relative positions of the first-stage sprocket assembly, the second-stage sprocket assembly, and the first-stage transmission shaft 40, a single servo motor 30 and a single transmission shaft 40 are used to achieve synchronous transmission of the two-stage sprocket assemblies. As Figure 1 shown, in this embodiment, the first-stage chain 18 is arranged around four first-stage driven sprockets 17. The first-stage driving sprocket 42 is located outside the first-stage chain 18 and presses the first-stage chain 18 inward, playing a tensioning role while transmitting power. The second-stage chain 28 surrounds four second-stage driven sprockets 27 and the second-stage driving sprocket 43. Among them, the second-stage driving sprocket 43 tensions the second-stage chain 28 outward, playing a tensioning role while transmitting power. The present invention uses sprockets as transmission components to form a planar transmission mechanism, which has strong anti-vibration ability, reliable transmission, is not easily jammed, and can reduce the height of the transmission mechanism in the vertical direction without occupying the lifting space.

[0032] For the transmission mechanism of the present invention, by reasonably distributing the gear tooth ratios of the two-stage transmission mechanisms, the sprocket tooth ratios, and the pitches of the screw sleeves of the lead screws, it is possible to ensure that the two-stage lifting mechanisms can synchronously achieve different lifting strokes according to the designed speed ratio. Assuming that the number of teeth of the first-stage driving sprocket 42 is Z 11 ; the number of teeth of the first-stage driven sprocket 17 is Z 12 ; the pitch of the cooperation between the first-stage lead screw 15 and the first-stage screw sleeve 16 is P1; the number of teeth of the second-stage driving sprocket 43 is Z 21 ; the number of teeth of the second-stage driven sprocket 27 is Z 22 ; the pitch of the cooperation between the second-stage lead screw 25 and the second-stage screw sleeve 26 is P2; the stroke of the first-stage lifting plate 14 is L1, and the stroke of the second-stage lifting plate 24 is L2, then the following relationship is satisfied for this lifting mechanism: .

[0033] Generally ; during design, according to the requirements of the stroke ratio, the ratio relationships of the gear tooth ratios, sprocket tooth ratios, and pitches of the two-stage transmission mechanisms are determined according to the above formula relationship.

[0034] The process of using the two-stage aviation lifting mechanism of the present invention for load lifting is as follows: When the load needs to be lowered, the servo motor 30 assembly rotates, driving the driving gear 31 connected by a key to transmit power to the driven gear 41, driving the transmission shaft 40 to rotate. Then, the first-stage driving sprocket 42 transmits power to the four groups of first-stage driven sprockets 17 through the first-stage chain 18, driving the first-stage screw sleeve 16 fixedly connected inside the first-stage driven sprocket 17 assembly to rotate, thereby driving the first-stage lifting plate 14, i.e., the entire second-stage lifting frame, to move downward; at the same time, the lower end of the transmission shaft 40 transmits power through screw connection and bearing support to the second-stage driving sprocket 43. The second-stage driving sprocket 43 meshes with the second-stage chain 28, driving the four groups of second-stage driven sprockets 27 to rotate. The second-stage driven sprockets 27 transmit the rotational motion to the second-stage lead screw 25 through the key connection inside. The second-stage lead screw 25 is threadedly connected to the second-stage screw sleeve 26, realizing the movement of the second-stage screw sleeve 26 on the second-stage lead screw 25, driving the second-stage lifting plate 24 and the load 50 to move downward relative to the second-stage lifting frame; Since the two-stage lifting mechanism shares a set of servo motor 30, when the servo motor 30 rotates, the two-stage lifting mechanism descends synchronously, lowering the load 50 to the lowest height. The descending state is as shown in Figures 1-2 shown; When the load 50 needs to be retracted, the servo motor 30 rotates in the reverse direction, and the two-stage lifting mechanism can be retracted synchronously. The second-stage lifting plate 24 rises to the retraction position in the second-stage lifting frame, and at the same time, the second-stage lifting frame is retracted into the first-stage lifting frame. The retraction state is shown in Figure 3 .

[0035] The two-stage aviation lifting mechanism of the present invention uses a set of servo motor drive system to drive two groups of sprockets through a synchronous rotating shaft, realizing the synchronous movement of the two-stage nested lifting mechanism. Theoretically, on the premise of maintaining a certain recovery space, the lifting stroke can be doubled, and it has the characteristics of small occupied space, large stroke, high reliability and low cost, and is particularly suitable for the lifting mechanism schemes of current aviation airborne optoelectronics, radar and other loads.

[0036] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the equivalent embodiments by using the above-disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A two-stage aviation lifting mechanism with a small space and a large stroke, comprising a first-stage lifting mechanism, a second-stage lifting mechanism, a transmission mechanism and a drive system, characterized in that, The first-level lifting mechanism includes a first-level lifting frame, a first-level lifting plate, and a first-level lead screw assembly. The first-level lifting plate is arranged in the first-level lifting frame in a liftable manner through the first-level lead screw assembly. The second-level lifting mechanism includes a second-level lifting frame, a second-level lifting plate, and a second-level lead screw assembly. The second-level lifting frame is nested in the first-level lifting frame, and the first-level lifting plate simultaneously serves as the second-level top plate of the second-level lifting frame. The second-level lifting plate is arranged in the second-level lifting frame in a liftable manner through the second-level lead screw assembly. The second-level lifting plate is used to connect the load. The drive system is arranged on the second-level lifting frame. The transmission mechanism includes a transmission shaft, a first-level sprocket assembly, and a second-level sprocket assembly. The power of the drive system is transmitted to the first-level sprocket assembly and the second-level sprocket assembly respectively through the transmission shaft. The first-level sprocket assembly and the first-level lead screw assembly are coaxially arranged, and the second-level sprocket assembly and the second-level lead screw assembly are coaxially arranged, so as to realize the synchronous lifting of the first-level lifting plate and the second-level lifting plate.

2. The two-stage aviation lifting mechanism with a small space and a large stroke according to claim 1, characterized in that, The drive system is a servo motor. The servo motor and the transmission shaft are arranged on the second-level lifting frame in parallel with each other and are in gear transmission therebetween. A first-level driving sprocket is fixed to the upper end of the transmission shaft. The first-level driving sprocket is connected to the first-level sprocket assembly through a first-level chain. A second-level driving sprocket is fixed to the lower end of the transmission shaft. The second-level driving sprocket is connected to the second-level sprocket assembly through a second-level chain.

3. A two-stage aviation lifting mechanism with a large stroke in a small space according to claim 2, characterized in that, A motor sleeve is arranged outside the servo motor. The lower end of the motor sleeve is fixed to the second-level lifting frame. A driving gear is fixed to the upper end of the output shaft of the servo motor. A driven gear meshing with the driving gear is also fixed to the upper end of the transmission shaft. The driven gear and the first-level driving sprocket form a double-link structure and are rotatably supported on the second-level lifting frame. The second-level driving sprocket at the lower end of the transmission shaft is rotatably supported on the second-level lifting frame.

4. A small-space large-stroke two-stage aviation lifting mechanism according to claim 2, characterized in that, The first-level lifting frame includes a first-level top plate, a first-level bottom plate, and first-level support plates. The first-level support plates are vertically connected between the first-level top plate and the first-level bottom plate. The first-level lifting plate is located between the first-level top plate and the first-level bottom plate. The second-level lifting frame includes a second-level top plate, a second-level bottom plate, and second-level support plates. The second-level top plate is the first-level lifting plate. The second-level support plates are vertically connected between the second-level top plate and the second-level bottom plate. The second-level lifting plate is located between the second-level top plate and the second-level bottom plate.

5. A two-stage aviation lifting mechanism with a small space and a large stroke according to claim 4, characterized in that, The first-level lead screw assembly includes multiple groups of first-level lead screws and first-level nuts in threaded cooperation. The upper and lower ends of multiple first-level lead screws are respectively fixed to the first-level top plate and the first-level bottom plate. A first-level nut is sleeved on each first-level lead screw. The first-level nut is rotatably connected to the first-level lifting plate and can drive the first-level lifting plate to move up and down. The second-level lead screw assembly includes multiple groups of second-level lead screws and second-level nuts in threaded cooperation. The upper and lower ends of multiple second-level lead screws are respectively rotatably supported on the second-level top plate and the second-level bottom plate. A second-level nut is sleeved on each second-level lead screw. The second-level nut is fixedly connected to the second-level lifting plate.

6. The two-stage aviation lifting mechanism with a small space and a large stroke according to claim 5, characterized in that, Both the first-level top plate and the first-level bottom plate are designed to be hollow, so that the second-level lifting frame can be retracted into the first-level lifting frame. Both the second-level top plate and the second-level bottom plate are designed to be hollow to avoid the load. One side of the first-level bottom plate is designed to be open to avoid the transmission shaft.

7. A two-stage aviation lifting mechanism with a small space and a large stroke according to claim 6, characterized in that, The first-level lead screw assembly includes four first-level lead screws, which are evenly distributed around the first-level lifting frame. The second-level lead screw assembly includes four second-level lead screws, which are evenly distributed around the second-level lifting frame and are located inside the first-level lead screw assembly.

8. A two-stage aviation lifting mechanism with a large stroke in a small space according to claim 5, characterized in that, The first-level sprocket assembly includes the same number of first-level driven sprockets as the first-level lead screws. The first-level driven sprockets are arranged under the first-level lifting plate and are coaxially and fixedly connected to the first-level screw sleeves. The second-level sprocket assembly includes the same number of second-level driven sprockets as the second-level lead screws. The second-level driven sprockets are arranged under the second-level bottom plate and are coaxially and fixedly connected to the second-level lead screws.

9. A two-stage aviation lifting mechanism with a large stroke in a small space according to claim 8, characterized in that The first-level chain is arranged around multiple first-level driven sprockets, and the first-level driving sprocket is located outside the first-level chain and presses the first-level chain.

10. A two-stage aviation lifting mechanism with a large stroke in a small space according to claim 8, characterized in that, The second-level chain surrounds the second-level driving sprocket and multiple second-level driven sprockets. The second-level driving sprocket and the second-level driven sprockets are both located inside the second-level chain, and the second-level driving sprocket tensions the second-level sprockets outward.

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