Two-stage aviation lifting mechanism with small space and large stroke

Abstract

The present application relates to a kind of small space big stroke two-stage aviation lifting mechanism, belong to aviation lifting machine field, including primary lifting mechanism, secondary lifting mechanism, transmission mechanism and drive system, primary lifting mechanism and secondary lifting mechanism adopt nested structure design, and share a set of servo motor, by the cooperation of transmission shaft, sprocket assembly and screw rod assembly, realize two-stage lifting plate driving load synchronous lifting, with the characteristics of small height occupied space, large stroke, high reliability and low cost, especially suitable for the lifting mechanism scheme of current aviation airborne photoelectric, radar and other loads.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aerial hoist, in particular to a small-space large-stroke two-stage aerial hoist. BACKGROUND

[0002] The aerial hoist is mainly used to realize the lifting function of the related load of the aircraft during the execution of the task of the aircraft. Due to the restriction of the on-board installation and the use environment, the aerial hoist is different from other common hoists, and the design requirements are relatively strict, and many factors need to be considered. On the one hand, due to the limited on-board space, for the lifting of some special loads, it is required to have a large stroke while occupying a small space, so it is required that the aerial hoist realizes a large lifting stroke in a small space as much as possible. On the other hand, the aircraft will produce severe vibration during flight, and the aerial hoist needs to have sufficient rigidity and strong anti-vibration ability. On the other hand, the lifting of the aerial hoist needs to be realized by the corresponding control system, and the more complex the structure is, the more the complexity of the control system will increase, and the failure rate will also increase, so it is required that the structure is as simple as possible and has high reliability. At the same time, under the premise of meeting the above requirements, the cost is as low as possible.

[0003] At present, the lifting method widely used in the aerial hoist mainly realizes the lifting of the load mounting plate through the combination of the servo motor, the chain wheel and the screw nut. The servo motor transmits power to the screw or the nut through the chain wheel to drive the load mounting plate to lift. In this method, the stroke of the load mounting plate is smaller than the height space of the lifting mechanism. If a large stroke is to be realized, the height direction size of the mechanism will be large, which is difficult to meet the demand of small space and large stroke of the on-board load.

[0004] In order to solve the problem of small space and large stroke, the two-stage or multi-stage lifting structure is adopted in the prior art in other application occasions. Although it can save space to a certain extent, it generally has the problems of complex structure and low reliability, and cannot meet the requirements of high rigidity, high reliability and low cost of the aerial hoist. Due to the existence of two lifting plates and many moving parts, the layout of the driving and transmission system is difficult, and the two-stage lifting mechanism usually needs to be provided with two motors to realize lifting by matching the transmission system. The parts are many, the structure is complex, two motors need to be controlled respectively, which leads to complex control system, low reliability and increased system cost. In addition, the layout of the driving system and the transmission system is unreasonable, which will further occupy the space in the vertical direction, and still cannot meet the use demand of the aerial hoist. SUMMARY

[0005] In view of the defects of the prior art, the present application provides a small-space large-stroke two-stage aerial hoist to meet the use demand of the on-board lifting load.

[0006] In order to achieve the above purpose, the technical scheme adopted by the present application is:

[0007] A two-stage aviation lifting mechanism with small space and large stroke, comprising a first-stage lifting mechanism, a second-stage lifting mechanism, a transmission mechanism and a driving system, the first-stage lifting mechanism comprising a first-stage lifting frame, a first-stage lifting plate and a first-stage screw assembly, the first-stage lifting plate being arranged in the first-stage lifting frame in a liftable manner through the first-stage screw assembly, the second-stage lifting mechanism comprising a second-stage lifting frame, a second-stage lifting plate and a second-stage screw assembly, the second-stage lifting frame being designed in a nested manner in the first-stage lifting frame and the first-stage lifting plate serving as the top plate of the second-stage lifting frame, the second-stage lifting plate being arranged in the second-stage lifting frame in a liftable manner through the second-stage screw assembly, the second-stage lifting plate being used for connecting a load, the driving system being arranged on the second-stage lifting frame, the transmission mechanism comprising a transmission shaft, a first-stage chain wheel assembly and a second-stage chain wheel assembly, the power of the driving system being transmitted to the first-stage chain wheel assembly and the second-stage chain wheel assembly through the transmission shaft, the first-stage chain wheel assembly being coaxially arranged with the first-stage screw assembly, and the second-stage chain wheel assembly being coaxially arranged with the second-stage screw assembly, so as to realize synchronous lifting of the first-stage lifting plate and the second-stage lifting plate.

[0008] Further, the driving system is a servo motor, the servo motor and the transmission shaft are arranged in parallel on the second-stage lifting frame and are connected through a gear transmission, the upper end of the transmission shaft is fixed with a first-stage driving chain wheel, the first-stage driving chain wheel is connected with the first-stage chain wheel assembly through a first-stage chain, and the lower end of the transmission shaft is fixed with a second-stage driving chain wheel, the second-stage driving chain wheel is connected with the second-stage chain wheel assembly through a second-stage chain.

[0009] Further, a motor cover is arranged outside the servo motor, the lower end of the motor cover is fixed on the second-stage lifting frame, the upper end of the output shaft of the servo motor is fixed with a driving gear, the upper end of the transmission shaft is further fixed with a driven gear meshing with the driving gear, the driven gear and the first-stage driving chain wheel form a double connection structure and are rotatably supported on the second-stage lifting frame, and the second-stage driving chain wheel at the lower end of the transmission shaft is rotatably supported on the second-stage lifting frame.

[0010] Further, the first-stage lifting frame comprises a first-stage top plate, a first-stage bottom plate and a first-stage support plate, the first-stage support plate is vertically connected between the first-stage top plate and the first-stage bottom plate, and the first-stage lifting plate is located between the first-stage top plate and the first-stage bottom plate; the second-stage lifting frame comprises a second-stage top plate, a second-stage bottom plate and a second-stage support plate, the second-stage top plate is the first-stage lifting plate, the second-stage support plate is vertically connected between the second-stage top plate and the second-stage bottom plate, and the second-stage lifting plate is located between the second-stage top plate and the second-stage bottom plate.

[0011] Further, the primary screw rod assembly comprises a plurality of groups of threadedly matched primary screw rods and primary screw sleeves, upper and lower ends of the plurality of primary screw rods are fixed on a primary top plate and a primary bottom plate respectively, one primary screw sleeve is sleeved on each primary screw rod, the primary screw sleeve is rotationally connected with a primary lifting plate and can drive the primary lifting plate to move up and down; the secondary screw rod assembly comprises a plurality of groups of threadedly matched secondary screw rods and secondary screw sleeves, upper and lower ends of the plurality of secondary screw rods are rotationally supported on a secondary top plate and a secondary bottom plate respectively, one secondary screw sleeve is sleeved on each secondary screw rod, and the secondary screw sleeve is fixedly connected with a secondary lifting plate.

[0012] Further, the primary top plate and the primary bottom plate are designed to be hollow, so that the secondary lifting frame can be recycled in the primary lifting frame, the secondary top plate and the secondary bottom plate are designed to be hollow to avoid the load, and one side of the primary bottom plate is designed to be open to avoid the transmission shaft.

[0013] Further, the primary screw rod assembly comprises four primary screw rods, the four primary screw rods are uniformly distributed around the primary lifting frame, the secondary screw rod assembly comprises four secondary screw rods, and the four secondary screw rods are uniformly distributed around the secondary lifting frame and are located inside the primary screw rod assembly.

[0014] Further, the primary chain wheel assembly comprises the same number of primary driven chain wheels as the primary screw rods, the primary driven chain wheels are arranged below the primary lifting plate and are fixedly connected with the primary screw sleeves in a coaxial manner, and the secondary chain wheel assembly comprises the same number of secondary driven chain wheels as the secondary screw rods, the secondary driven chain wheels are arranged below the secondary bottom plate and are fixedly connected with the secondary screw rods in a coaxial manner.

[0015] Further, the primary chain is arranged around the plurality of primary driven chain wheels, and the primary driving chain wheel is located outside the primary chain and compresses the primary chain.

[0016] Further, the secondary chain is arranged around the secondary driving chain wheel and the plurality of secondary driven chain wheels, the secondary driving chain wheel and the secondary driven chain wheels are located inside the secondary chain, and the secondary driving chain wheel tensions the secondary chain wheel outward.

[0017] Beneficial effects:

[0018] The two-stage aviation lifting mechanism adopts a nested frame structure, takes the secondary lifting frame as a lifting frame of the primary lifting mechanism, and is lifted as a whole by the primary lifting mechanism. When recycled, it can be recycled into the primary lifting frame. When the two-stage lifting mechanism is fully lowered, the stroke is equal to the stroke of the primary lifting plate plus the stroke of the secondary lifting plate. The two-stage aviation lifting mechanism has the characteristics of small height occupation space and large stroke, effectively reduces the weight of the mechanism, and is particularly suitable for the lifting mechanism scheme of the current aviation airborne photoelectric, radar and other loads.

[0019] Based on the nested two-stage lifting frame, the present invention cleverly designs the driving system and transmission mechanism, and only uses one set of power system to drive two sets of sprockets through the synchronous rotating shaft, thereby realizing the synchronous lifting of the two-stage lifting mechanism and effectively reducing the complexity of the structure. The simplification of the structural design also reduces the difficulty and complexity of the control system. Through the reasonable ratio of the traditional system, the two-stage lifting mechanism can be synchronously lifted and lowered at different speeds according to different strokes by controlling one set of servo motors, so that the lifting mechanism has high reliability and low failure rate.

[0020] The present invention uses a servo motor and a transmission shaft, a chain drive, and a lead screw nut for lifting. The entire transmission system is stable and reliable, with a compact structure, so that the system has good vibration and impact resistance while having sufficient rigidity, and can meet the special requirements of airborne lifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the overall structure of the present invention (descending state);

[0022] Figure 2 for Figure 1 A partial cross-sectional view of

[0023] Figure 3 It is a schematic structural diagram of the recycling state of the present invention.

[0024] Figure numerals: 10 first-level lifting mechanism, 11 first-level top plate, 12 first-level bottom plate, 13 first-level support plate, 14 first-level lifting plate, 15 first-level lead screw, 16 first-level screw sleeve, 17 first-level driven sprocket, 18 first-level chain, 19 locking nut; 20 second-level lifting mechanism, 21 second-level top plate, 22 second-level bottom plate, 23 second-level support plate, 24 second-level lifting plate, 25 second-level lead screw, 26 second-level screw sleeve, 27 second-level driven sprocket, 28 second-level chain, 29 second-level lower rotary support assembly; 30 servo motor, 31 driving gear; 40 transmission shaft, 41 driven gear, 42 first-level driving sprocket, 43 second-level driving sprocket; 50 load. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] like Figures 1-3 As shown, a two-stage aviation lifting mechanism with a small space and large stroke includes a first-stage lifting mechanism 10, a second-stage lifting mechanism 20, a transmission mechanism and a drive system. It is mainly used to be installed on an aircraft to realize the lifting function of the corresponding load. It adopts a nested structural design and a single drive method, has high reliability, and can achieve double the lifting stroke under the premise of a certain recovery space.

[0027] The primary lifting mechanism 10 comprises a primary lifting frame, a primary lifting plate 14 and a primary screw assembly; as Figure 1 As shown, the primary lifting frame comprises a primary top plate 11, a primary bottom plate 12 and a primary support plate 13, the primary support plate 13 is vertically connected between the primary top plate 11 and the primary bottom plate 12 through screw fasteners, and the primary top plate 11 and the primary bottom plate 12 are both designed as hollow, and the three form a frame structure; the primary top plate 11 is designed as a top support plate of the lifting mechanism and has an interface connected with the aircraft at the same time, which can realize the docking of the entire lifting mechanism with the aircraft, and the primary lifting plate 14 is arranged between the primary top plate 11 and the primary bottom plate 12 of the primary lifting frame through the primary screw assembly.

[0028] The primary screw assembly comprises a plurality of groups of primary screws 15 and primary screw sleeves 16 in threaded cooperation, in this embodiment, the primary screw assembly comprises four primary screws 15 distributed around the primary lifting frame, the upper and lower ends of the four primary screws 15 are fixed on the primary lifting frame, specifically, the upper end of the primary screw 15 is connected with the primary top plate 11 through a screw, and the lower end of the primary screw 15 is connected with the primary bottom plate 12 through a locking nut 19; one primary screw sleeve 16 is sleeved on each primary screw 15, the primary screw sleeve 16 is rotatably connected with the primary lifting plate 14 through a bearing assembly and can drive the primary lifting plate 14 to move up and down; in the primary lifting mechanism 10, the primary screw 15 does not rotate, and the primary lifting plate 14 is driven to move up and down by the rotation of the primary screw sleeve 16.

[0029] The secondary lifting mechanism 20 comprises a secondary lifting frame, a secondary lifting plate 24 and a secondary screw assembly, the secondary lifting frame comprises a secondary top plate 21, a secondary bottom plate 22 and a secondary support plate 23, the secondary support plate 23 is vertically connected between the secondary top plate 21 and the secondary bottom plate 22, the secondary top plate 21 is the primary lifting plate 14, the secondary lifting frame is designed in a nested manner in the primary lifting frame, and the primary lifting plate 14 simultaneously serves as the secondary top plate 21 of the secondary lifting frame, so that the secondary lifting frame can be lifted as a whole by the primary lifting mechanism 10; the secondary lifting plate 24 is used for connecting the load 50, the secondary top plate 21 and the secondary bottom plate 22 are both designed as hollow to avoid the load 50, and the secondary lifting plate 24 is arranged between the secondary top plate 21 and the secondary bottom plate 22 of the secondary lifting frame through the secondary screw assembly.

[0030] The secondary screw assembly comprises a plurality of sets of threadedly matched secondary screws 25 and secondary nuts 26. In this embodiment, the secondary screws 25 are four in number, and are distributed around the secondary lifting frame and located inside the primary screw assembly. The upper and lower ends of the four secondary screws 25 are rotatably supported on the secondary top plate 21 and the secondary bottom plate 22 via bearing assemblies, respectively. One secondary nut 26 is sleeved on each secondary screw 25, and the secondary nut 26 is fixedly connected with the secondary lifting plate 24. In the secondary lifting mechanism 20, the secondary nut 26 is fixed with the secondary lifting plate 24, and the secondary screw 25 rotates to drive the secondary lifting plate 24 to move up and down.

[0031] The driving system is a single set of servo motor 30 installed on the secondary lifting frame. The transmission mechanism comprises a transmission shaft 40, a primary sprocket assembly and a secondary sprocket assembly. The primary sprocket assembly is coaxially arranged with the primary screw assembly, and the secondary sprocket assembly is coaxially arranged with the secondary screw assembly. The power output by the servo motor 30 is transmitted to the primary sprocket assembly and the secondary sprocket assembly via the transmission shaft 40, respectively. The primary sprocket assembly drives the primary screw assembly, and the secondary sprocket assembly drives the secondary screw assembly, thereby achieving the synchronous lifting of the primary lifting plate 14 and the secondary lifting plate 24.

[0032] Specifically, as shown in Figure 2 The servo motor 30 and the transmission shaft 40 are arranged in parallel 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. The servo motor 30 is externally provided with a motor cover, the lower end of which is fixed on the secondary bottom plate 22 of the secondary lifting frame. The upper end of the output shaft of the servo motor 30 is fixed with a driving gear 31, and the upper end of the transmission shaft 40 is fixed with a driven gear 41. The power transmission is achieved through the meshing of the driving gear 31 and the driven gear 41.

[0033] Further, the upper end of the transmission shaft 40 is fixed with a primary driving sprocket 42, and the lower end of the transmission shaft 40 is fixed with a secondary driving sprocket 43. The driven gear 41 and the primary driving sprocket 42 form a double coupling structure, which is fixed on the upper end of the transmission shaft 40 and rotatably supported on the secondary top plate 21 (i.e. the primary lifting plate 14) via a bearing assembly. The secondary driving sprocket 43 is fixed on the lower end of the transmission shaft 40 and rotatably supported on the secondary bottom plate 22 via a secondary lower rotary support assembly 29 (including a secondary sprocket shaft, bearings, etc.).

[0034] Specifically, the primary sprocket assembly includes the same number of primary driven sprockets 17 as the primary leadscrews 15, i.e. one primary driven sprocket 17 corresponds to each primary leadscrew 15, the primary driven sprockets 17 are rotatably arranged below the primary lifting plate 14 and fixedly connected with the primary thimble 16 coaxially through a bearing assembly, the primary driving sprocket 42 is connected with the plurality of primary driven sprockets 17 through the primary chain 18; the secondary sprocket assembly includes the same number of secondary driven sprockets 27 as the secondary leadscrews 25, i.e. one secondary driven sprocket 27 corresponds to each secondary leadscrew 25, the secondary driven sprockets 27 are rotatably arranged below the secondary base plate 22 and fixedly connected with the secondary leadscrews 25 coaxially through a bearing assembly, the secondary driving sprocket 43 is connected with the plurality of secondary driven sprockets 27 through the secondary chain 28.

[0035] In the embodiment, the relative positions of the primary sprocket assembly, the secondary sprocket assembly and the primary transmission shaft 40 are arranged skillfully, and one servo motor 30 and one transmission shaft 40 are used to realize synchronous transmission of the two-stage sprocket assemblies, as shown in the figure. Figure 1 In the embodiment, the primary chain 18 is arranged around the four primary driven sprockets 17, the primary driving sprocket 42 is located outside the primary chain 18 and presses the primary chain 18 inwardly to achieve tensioning while transmitting power; the secondary chain 28 is arranged around the four secondary driven sprockets 27 and the secondary driving sprocket 43, wherein the secondary driving sprocket 43 tensions the secondary chain 28 outwardly to achieve tensioning while transmitting power; the sprocket is used as the transmission assembly in the application, a planar transmission mechanism is formed, the transmission mechanism has strong anti-vibration ability, the transmission is reliable and not easy to be stuck, and the height of the transmission mechanism in the vertical direction can be reduced, and the lifting space is not occupied.

[0036] The transmission mechanism of the application can ensure that the two-stage lifting mechanisms can realize different lifting strokes synchronously at the designed speed ratio by reasonably distributing the gear tooth number ratio, the sprocket tooth number ratio and the pitch of the leadscrew and the thimble. 11 ; the primary driven sprockets 17 have Z 12 ; the primary leadscrew 15 and the primary thimble 16 have a pitch of P1; the secondary driving sprocket 43 has Z 21 ; the secondary driven sprockets 27 have Z 22 ; the secondary leadscrew 25 and the secondary thimble 26 have a pitch of P2; the stroke of the primary lifting plate 14 is L1, and the stroke of the secondary lifting plate 24 is L2, and the lifting mechanism satisfies the following relationship: .

[0037] Generally ; when designed, the gear tooth number ratio, the sprocket tooth number ratio and the pitch ratio of the two-stage transmission mechanisms are determined according to the stroke ratio requirement according to the above formula.

[0038] The process of lifting the load by using the two-stage aviation lifting mechanism is as follows: when the load needs to be lowered, the servo motor 30 assembly rotates, drives the power to the driven gear 41 through the key connection of the driving gear 41, drives the transmission shaft 40 to rotate, and then the power is transmitted to the four groups of first driven sprocket 17 through the first sprocket 42 and the first chain 18, which drives the first lifting plate 14 inside the first driven sprocket 17 assembly to rotate, thereby driving the entire two-stage lifting frame to move downward; at the same time, the transmission shaft 40 at the lower end is connected and supported by the screw and the bearing to transmit the power to the second driving sprocket 43, the second driving sprocket 43 is engaged with the second chain 28, which drives the four groups of second driven sprocket 27 to rotate, and the second driven sprocket 27 transmits the rotary motion to the second screw 25 through the internal key connection, and the second screw 25 is connected with the second nut 26 through the thread connection, so as to realize the movement of the second nut 26 on the second screw 25, and drive the second lifting plate 24 and the load 50 to move downward relative to the second 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 synchronously lowers the load 50 to the lowest height, and the lowering state is shown in Figures 1-2 ; when the load 50 needs to be recovered, the servo motor 30 reverses the rotation, so that the two-stage lifting mechanism is synchronously recovered, the second lifting plate 24 is lifted to the recovery position in the second lifting frame, and the second lifting frame is recovered into the first lifting frame, and the recovery state is shown in Figure 3 .

[0039] The two-stage aviation lifting mechanism of the application utilizes a set of servo motor driving system, drives two groups of sprockets through the synchronous rotary shaft, realizes the synchronous movement of the two-stage nested lifting mechanism, theoretically doubles the lifting stroke under the premise of keeping a certain recovery space, has the characteristics of small height occupation space, large stroke, high reliability and low cost, and is particularly suitable for the lifting mechanism scheme of the current airborne photoelectric, radar and other loads.

[0040] The above is only the preferred embodiment of the application, and does not limit the application in any form. Although the application has been disclosed as above, it is not intended to limit the application. Any skilled person in the art can make some changes or modifications to the above disclosed technical content without departing from the scope of the technical solution of the application, and any simple modification, equivalent change and modification of the above embodiment based on the technical essence of the application are still within the scope of the technical solution of the application.

Claims

1. A two-stage aviation lifting mechanism with a small space and 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 comprises a first-level lifting frame, a first-level lifting plate and a first-level screw assembly, the first-level lifting frame comprises a first-level top plate, a first-level bottom plate and a first-level support plate, the first-level support plate is vertically connected between the first-level top plate and the first-level bottom plate, and the first-level lifting plate is located between the first-level top plate and the first-level bottom plate; the first-level lifting plate is lifted and arranged in the first-level lifting frame through the first-level screw assembly, the first-level screw assembly comprises a plurality of groups of first-level screws and first-level screw sleeves with threaded matching, the upper and lower ends of the plurality of first-level screws are respectively fixed to the first-level top plate and the first-level bottom plate, a first-level screw sleeve is sleeved on each first-level screw, the first-level screw sleeve 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 lifting mechanism comprises a second-level lifting frame, a second-level lifting plate and a second-level screw assembly, the second-level lifting frame is nested in the first-level lifting frame and the first-level lifting plate also serves as the top plate of the second-level lifting frame, the second-level lifting frame comprises a second-level top plate, a second-level bottom plate and a second The lifting plate is a vertical jackknife that is fixed on the lifting platform, and the lifting plate is a vertical jackknife that is fixed on the lifting platform. The lifting plate is a vertical jackknife that is fixed on the lifting platform, and the lifting plate is a vertical jackknife that is fixed on the lifting platform. The lifting plate is a vertical jackknife that is fixed on the lifting platform, and the lifting plate is a vertical jackknife that is fixed on the lifting platform.

2. The small space and large stroke two-stage aviation lifting mechanism according to claim 1 is characterized in that: The driving system is a servo motor, and the servo motor and the transmission shaft are arranged parallel to each other on the secondary lifting frame and are driven by gears. A primary driving sprocket is fixed to the upper end of the transmission shaft, and the primary driving sprocket is connected to the primary sprocket assembly through a primary chain. A secondary driving sprocket is fixed to the lower end of the transmission shaft, and the secondary driving sprocket is connected to the secondary sprocket assembly through a secondary chain.

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

4. The small space and large travel two-stage aviation lifting mechanism according to claim 1, characterized in that: The first-level top plate and the first-level bottom plate are both hollow designs, so that the second-level lifting frame can be retracted into the first-level lifting frame. The second-level top plate and the second-level bottom plate are both hollow designs to avoid the load. One side of the first-level bottom plate is designed to be open to avoid the drive shaft.

5. The small space and large stroke two-stage aviation lifting mechanism according to claim 4 is characterized in that: The first-level screw assembly includes four first-level screws, which are evenly distributed around the first-level lifting frame. The second-level screw assembly includes four second-level screws, which are evenly distributed around the second-level lifting frame and located on the inner side of the first-level screw assembly.

6. The small space and large travel two-stage aviation lifting mechanism according to claim 2, characterized in that: The first-level sprocket assembly includes the same number of first-level driven sprockets as the first-level screw, and the first-level driven sprocket is arranged under the first-level lifting plate and is coaxially fixedly connected to the first-level sleeve; the second-level sprocket assembly includes the same number of second-level driven sprockets as the second-level screw, and the second-level driven sprocket is arranged under the second-level base plate and is coaxially fixedly connected to the second-level screw.

7. The small space and large travel two-stage aviation lifting mechanism according to claim 6, characterized in that: The primary chain is arranged around a plurality of primary driven sprockets, and the primary driving sprocket is located outside the primary chain and presses the primary chain.

8. The small space and large travel two-stage aviation lifting mechanism according to claim 6, characterized in that: The secondary chain surrounds the secondary driving sprocket and multiple secondary driven sprockets. The secondary driving sprocket and the secondary driven sprocket are both located inside the secondary chain. The secondary driving sprocket tensions the secondary sprocket outward.

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