A vacuum adsorption device for hoisting aircraft skin

Abstract

The present invention belongs to the technical field of flexible support of aircraft skin, and specifically discloses a vacuum adsorption device for hoisting aircraft skin, comprising an inner box and an outer box, wherein the inner box is arranged in the outer box and movably connected to the inner side wall of the outer box, the inner box can be vertically lifted and lowered relative to the outer box along the axial direction, a plurality of vacuum adsorption units are arranged in the inner box, a universal vacuum suction cup can be tilted in any direction relative to a telescopic cylinder, a vacuum inlet is arranged in the middle of the universal vacuum suction cup, and a plurality of vacuum adsorption devices can hoist large aircraft skins with complex curved surfaces by combining manual adjustment and automatic adjustment, and can enable different vacuum adsorption units to more accurately control the extension height of the telescopic cylinder when adsorbing aircraft skins with complex curved surfaces, thereby reducing the deformation of the aircraft skin, and different types of aircraft skins can be better adsorbed by replacing universal vacuum suction cups of different diameters.

Description

Technical Field

[0001] The invention belongs to the technical field of flexible support of aircraft skins, and specifically discloses a vacuum adsorption device for hoisting aircraft skins. Background Art

[0002] As is known, aircraft skin is the surface part that constitutes the aerodynamic shape of the aircraft. It is large in size, high in rigidity, wide in variety, complex and diverse in shape, and produced in small batches. It is an important part to ensure the aerodynamic performance of the aircraft. During the aircraft assembly and manufacturing process, the skin needs to be demolded and lifted. Due to the poor rigidity and small thickness of the skin, it is easy to deform during the demolding and lifting process.

[0003] At present, aircraft skin lifting is carried out by passing steel wire ropes through positioning holes. During the lifting process, the aircraft skin is prone to large deformation and cannot be accurately positioned. Major technical indicators such as safety and degree of automation are difficult to meet the lifting requirements of the skin, and it is impossible to achieve fully automatic adsorption lifting of the aircraft skin when it has been accurately clamped. Summary of the invention

[0004] In order to solve the problems in the background technology, the present invention discloses a vacuum adsorption device for hoisting aircraft skin, which is used for hoisting aircraft skin with complex curved surfaces. It can realize adaptive vacuum adsorption according to the curved surface shape of the skin, effectively replacing the traditional hoisting method and reducing the irregular deformation of the aircraft skin with complex curved surfaces during the hoisting process.

[0005] In order to achieve the above-mentioned invention object, the present invention adopts the following technical scheme:

[0006] A vacuum adsorption device for hoisting aircraft skin comprises an inner box and an outer box, wherein the inner box is arranged in the outer box and is movably connected to the inner side wall of the outer box, and under the action of a driving mechanism, the inner box can be vertically lifted and lowered relative to the outer box along the axial direction, and a plurality of vacuum adsorption units are arranged in the inner box, wherein the vacuum adsorption unit comprises a guide cylinder, a telescopic cylinder and a universal vacuum suction cup, wherein the upper end of the guide cylinder is connected to the top plate of the inner box, the lower end of the guide cylinder is connected to the brake fixing plate arranged at the lower part of the inner box, the upper end of the telescopic cylinder is passed through the guide cylinder, a compression spring is arranged between the top of the telescopic cylinder and the top of the guide cylinder, the lower end of the telescopic cylinder passes through the bottom plate of the inner box and the bottom plate of the outer box in turn and is movably connected to the universal vacuum suction cup through a multi-stage ball valve, the universal vacuum suction cup can be tilted in any direction relative to the telescopic cylinder, and the maximum tilt angle is equal to 60-70 degrees, and a vacuum inlet is arranged in the middle of the universal vacuum suction cup.

[0007] Furthermore, the vacuum adsorption device for hoisting the aircraft skin is provided with a brake device in the inner box, the brake device includes a brake line and a guide device and a brake arranged on a brake fixing plate, the lower end of the brake line is connected to the guide device and the brake in sequence, the upper end of the brake line is connected to the buffer device, the buffer device is arranged at the bottom of the movable plate, a cylinder fixing plate is arranged above the movable plate, the cylinder fixing plate is fixedly connected to the inner wall of the inner box, a plurality of cylinders extending toward the movable plate are arranged at the bottom of the cylinder fixing plate, the cylinder body is connected to the bottom of the cylinder fixing plate, the extension rod of the cylinder is connected to the top of the movable plate, under the action of the cylinder, the movable plate can be vertically lifted and lowered and drive the buffer device to move synchronously, so that the brake line is always in a tensioned state.

[0008] Furthermore, the vacuum adsorption device for hoisting aircraft skin is provided with positioning plates on both sides of the outer box body, and the positioning plates are movably connected to the outer side walls of the outer box body through matching sliders and linear guides. The positioning plates can move up and down relative to the outer box body along the linear guides, and a plurality of groups of positioning holes spaced apart in the vertical direction are provided in the middle portion of the outer side walls of the outer box body. A plurality of positioning bolts are threadedly connected to the positioning plate, and the positioning bolts are matched with the positioning holes for positioning the positioning plate.

[0009] Furthermore, the driving mechanism of the vacuum adsorption device for hoisting the aircraft skin includes a rod motor arranged above the middle part of the outer box body, the rod of the rod motor extends vertically downward, the lower end of the rod is connected to the connecting block on the top of the inner box body by a thread, and the outer wall of the inner box body is slidably connected to the inner wall of the outer box body by a linear module. Under the action of the rod motor and the linear module, the inner box body can be vertically lifted and lowered relative to the outer box body.

[0010] Furthermore, the vacuum adsorption device for hoisting aircraft skin is provided with a plurality of vertically arranged guide columns between the cylinder fixing plate and the brake fixing plate. The guide columns pass through the movable plate. Linear bearings are respectively arranged at positions on the movable plate corresponding to the guide columns. The linear bearings are slidably connected to the guide columns.

[0011] Furthermore, in the vacuum adsorption device for hoisting aircraft skin, the suction cup fixing cover on the upper part of the universal vacuum suction cup is connected to the suction cup fixing seat, the upper part of the suction cup fixing seat is threadedly connected with a first-level ball valve, the top of the first-level ball valve is threadedly connected with a first-level ball valve fixing block, the upper part of the first-level ball valve is provided with a second-level ball valve cover, the second-level ball valve cover is threadedly connected to the second-level ball valve seat, the second-level ball valve seat is threadedly connected to the second-level ball valve fixing block, the upper surface of the first-level ball valve and the lower surface of the second-level ball valve cover are both spherical surfaces, and can cooperate with each other, and the upper surface of the second-level ball valve cover and the first-level ball valve fixing block are threadedly connected. The lower surfaces are all spherical and can cooperate with each other, the lower surface of the secondary ball valve seat and the upper surface of the primary ball valve fixing block are both spherical and can cooperate with each other, the upper surface of the secondary ball valve seat and the outer surface of the bottom of the primary ball valve seat are both spherical and can cooperate with each other, the inner surface of the bottom of the primary ball valve base and the lower surface of the secondary ball valve fixing block are both spherical and can cooperate with each other, the upper part of the primary ball valve seat is connected to the lower end of the telescopic cylinder, and vacuum holes are opened in the primary ball valve seat, the secondary ball valve fixing block, the primary ball valve fixing block, the secondary ball valve seat, the secondary ball valve cover and the middle of the primary ball valve spherical surface.

[0012] Furthermore, the vacuum adsorption device for hoisting aircraft skin is provided with a scale extending in the vertical direction in the middle of both sides of the outer box, and the scale is used to measure the displacement of the positioning plate relative to the outer box.

[0013] Furthermore, the vacuum adsorption device for hoisting aircraft skin has a plurality of handles arranged at intervals on the top of the top plate of the outer box body.

[0014] Furthermore, the vacuum adsorption device for hoisting aircraft skin is provided with a rubber buffer device at the bottom of the top plate of the outer box body.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The vacuum adsorption device for hoisting aircraft skin of the present invention comprises a plurality of vacuum adsorption units, each of which comprises a guide tube, a telescopic tube, a universal vacuum suction cup and a compression spring. The plurality of vacuum adsorption devices can hoist large aircraft skin with complex curved surfaces by combining manual adjustment and automatic adjustment. By selecting different stiffness coefficients of the compression spring and the height of the compression spring, different vacuum adsorption units can more accurately control the extension height of the telescopic tube when adsorbing the aircraft skin with complex curved surfaces, thereby reducing the deformation of the aircraft skin. By replacing the universal vacuum suction cups with different diameters, different types of aircraft skin can be better adsorbed.

[0017] The present invention is a vacuum adsorption device for hoisting aircraft skin, comprising a positioning plate, a positioning bolt, a linear guide rail, a slider, a scale, a rod motor, an inner box body and an outer box body. The height of the outer box body can be adjusted by the positioning plate and the matching linear guide rail and the slider, and the positioning is locked and positioned by the positioning bolts. The installation height of the entire vacuum adsorption device is measured according to the scale of the scale. The extension length of the rod is controlled by adjusting the rod motor, thereby controlling the extension height of the inner box body. The heights of the inner box body and the outer box body can be conveniently adjusted, thereby reducing the occupied space of the entire device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The cross-sectional structure diagram of the vacuum adsorption device of the present invention is Figure 1 ;

[0019] Figure 2 It is a structural schematic diagram of the vacuum adsorption unit in the present invention;

[0020] Figure 3 yes Figure 2 A schematic diagram of the enlarged structure of the local A in the middle;

[0021] Figure 4 The cross-sectional structure diagram of the vacuum adsorption device of the present invention is Figure 2 ;

[0022] Figure 5 It is a side view structural schematic diagram of the vacuum adsorption device of the present invention;

[0023] In the above figure: 1-rod motor; 2-rod; 3-handle; 4-outer box; 5-rubber buffer device; 6-positioning bolt; 7-positioning plate; 8-slider; 9-linear guide; 10-inner box; 11-guide cylinder; 12-inner box top plate; 13-cylinder fixing plate; 14-linear module; 15-cylinder; 16-movable plate; 17-brake fixing plate; 18-buffer device; 19-brake line; 20-guide device; 21-brake; 22-universal true Empty suction cup; 23-telescopic cylinder; 24-compression spring; 25-first-stage ball valve seat; 26-second-stage ball valve fixing block; 27-first-stage ball valve fixing block; 28-second-stage ball valve seat; 29-second-stage ball valve cover; 30-sealing ring B; 31-first-stage ball valve; 32-sealing ring A; 33-suction cup fixing seat; 34-suction cup fixing cover; 35-guide column; 36-linear bearing; 37-gate wire connecting block; 38-spring; 39-housing; 40-positioning hole; 41-scale. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Combined with Figure 1-5 , the present invention is a vacuum adsorption device for hoisting aircraft skin, comprising an inner box 10 and an outer box 4, wherein the inner box 10 is arranged inside the outer box 4 and is movably connected to the inner side wall of the outer box 4, and under the action of a driving mechanism, the inner box 10 can be vertically lifted and lowered relative to the outer box 4 along the axial direction, and a plurality of vacuum adsorption units are arranged inside the inner box 10, wherein the vacuum adsorption units include a guide cylinder 11, a telescopic cylinder 23 and a universal vacuum suction cup 22, wherein the upper end of the guide cylinder 11 is connected to the inner box top plate 12, and the lower end of the guide cylinder 11 is connected to the brake fixing plate 17 arranged at the lower part of the inner box 10 The upper end of the telescopic cylinder 23 is inserted into the guide cylinder 11, and a compression spring 24 is arranged between the top of the telescopic cylinder 23 and the top of the guide cylinder 11. The lower end of the telescopic cylinder 23 passes through the bottom plate of the inner box body 10 and the bottom plate of the outer box body 4 in turn and is movably connected to the universal vacuum suction cup 22 through a multi-stage ball valve. Each vacuum adsorption unit can select compression springs 24 of different stiffness coefficients and different lengths as needed. The universal vacuum suction cup 22 can be tilted in any direction relative to the telescopic cylinder 23, and the maximum tilt angle is equal to 60-70 degrees. A vacuum inlet is arranged in the middle of the universal vacuum suction cup 22.

[0026] As an optional design, the vacuum adsorption device for hoisting the aircraft skin is preferably provided with a brake device in the inner box 10, the brake device includes a brake line 19 and a guide device 20 and a brake 21 arranged on the brake fixing plate 17, the lower end of the brake line 19 is connected to the guide device 20 and the brake 21 in sequence, the upper end of the brake line 19 is connected to the buffer device 18, the buffer device 18 is arranged at the bottom of the movable plate 16, and the buffer device 18 is fixedly connected to the movable plate 16 through the thread at the bottom of its shell 39, the A spring 38 is fixedly installed between the inner surface of the housing 39 and the brake wire connecting block 37. A cylinder fixing plate 13 is arranged above the movable plate 16. The cylinder fixing plate 13 is fixedly connected to the inner wall of the inner box 10. A plurality of cylinders 15 extending toward the movable plate 16 are arranged at the bottom of the cylinder fixing plate 13. The cylinder body of the cylinder 15 is connected to the bottom of the cylinder fixing plate 13. The extending rod of the cylinder 15 is connected to the top of the movable plate 16. A plurality of vertically arranged guide columns 3 are arranged between the cylinder fixing plate 13 and the brake fixing plate 17. 5, the guide column 35 passes through the movable plate 16, and the linear bearings 36 are respectively arranged at the positions corresponding to the guide columns 35 on the movable plate 16, and the linear bearings 36 are slidably connected with the guide columns 35. Under the action of the cylinder 15, the movable plate 16 can be vertically lifted and lowered along the guide columns 35 and drive the buffer device 18 to move synchronously. The buffer device 18 ensures that when the cylinder 15 acts, the brake wire 19 can be tightened so that the brake 21 can hold the telescopic cylinder 23 tightly. After the universal vacuum suction cup 22 absorbs the aircraft skin, the present invention is lifted by the lifting equipment. The vacuum adsorption device for lifting the aircraft skin is lifted, the cylinder 15 extends the rod and contracts to pull the movable plate 16 upward, the brake line 19 is tightened, and the brake 21 holds the telescopic cylinder 23 to limit the axial extension and contraction of the telescopic cylinder 23, and the aircraft skin is smoothly transferred to the destination. After the skin reaches the specified position, when the aircraft skin needs to be lowered, the vacuum is turned off. After the skin is lowered, the cylinder 15 extends the rod and stretches to push the movable plate 16 downward, the brake line 19 becomes loose, the brake 21 releases the telescopic cylinder 23, and the vacuum adsorption unit returns to its initial state.

[0027] As an optional design, the vacuum adsorption device for hoisting aircraft skin is preferably provided with positioning plates 7 on both sides of the outer box body 4, and two linear guide rails 9 extending in the vertical direction are provided at positions of the two side walls of the outer box body 4 corresponding to the positioning plates 7. A slider 8 matching the linear guide rails 9 is provided on the side of the positioning plate 7 facing the outer box body 4. The positioning plate 7 is movably connected to the outer side wall of the outer box body 4 through the matching slider 8 and the linear guide rail 9. The positioning plate 7 can move up and down relative to the outer box body 4 along the linear guide rail 9. A plurality of groups of positioning holes 40 spaced apart in the vertical direction are provided in the middle part of the outer side wall of the outer box body 4. A plurality of positioning bolts 6 are threadedly connected to the positioning plate 7. The positioning bolts 6 match the positioning holes 40 and are used for positioning the positioning plate 7. The vacuum adsorption device for hoisting aircraft skin of the present invention is connected to a suitable position through the positioning plate 7, and the height of the inner box body 10 and the outer box body 4 can be fine-tuned by moving the positioning plate 7 up and down relative to the outer box body 4 along the linear guide rail 9.

[0028] As an optional design, the vacuum adsorption device for hoisting the aircraft skin is preferably used, and the driving mechanism includes a rod motor 1 arranged above the middle of the outer box body 4, and the rod 2 of the rod motor 1 extends vertically downward, and the lower end of the rod 2 is connected to the connecting block at the top of the inner box body 10 by a thread, and the outer wall of the inner box body 10 is slidingly connected to the inner wall of the outer box body 4 by a linear module 14. Under the action of the rod motor 1 and the linear module 14, the inner box body 10 can be vertically lifted and lowered relative to the outer box body 4 to adjust the height of the vacuum adsorption unit, and when the vacuum adsorption unit is through vacuum adsorption of the aircraft skin, the universal vacuum suction cup 22 of the different vacuum adsorption units is fine-tuned to a suitable height through the telescopic cylinder 23 and the compression spring 24 as needed.

[0029] As an optional design, the vacuum adsorption device for hoisting aircraft skin is preferably used, the suction cup fixing cover 34 on the upper part of the universal vacuum suction cup 22 is connected to the suction cup fixing seat 33, the upper part of the suction cup fixing seat 33 is threadedly connected with a primary ball valve 31, the suction cup fixing seat 33 and the primary ball valve 31 are connected by bolts, and a sealing ring A32 is provided on the contact surface between the suction cup fixing seat 33 and the primary ball valve 31, the top of the primary ball valve 31 is threadedly connected with a primary ball valve fixing block 27, the upper part of the primary ball valve 31 is provided with a secondary ball valve cover 29, the secondary ball valve cover 29 is threadedly connected to the secondary ball valve seat 28, a sealing ring B30 is provided between the contact surface of the secondary ball valve cover 29 and the secondary ball valve seat 28, the secondary ball valve seat 28 is threadedly connected to the secondary ball valve fixing block 26, the primary ball valve 31 The upper surface and the lower surface of the secondary ball valve cover 29 are both spherical and can cooperate with each other. The upper surface of the secondary ball valve cover 29 and the lower surface of the primary ball valve fixing block 27 are both spherical and can cooperate with each other. The lower surface of the secondary ball valve seat 28 and the upper surface of the primary ball valve fixing block 27 are both spherical and can cooperate with each other. The upper surface of the secondary ball valve seat 28 and the outer surface of the bottom of the primary ball valve seat 25 are both spherical and can cooperate with each other. The inner surface of the bottom of the base of the primary ball valve 31 and the lower surface of the secondary ball valve fixing block 26 are both spherical and can cooperate with each other. The upper end of the primary ball valve seat 25 is connected to the lower end of the telescopic cylinder 23, and vacuum holes are provided in the middle of the spherical surfaces of the primary ball valve seat 25, the secondary ball valve fixing block 26, the primary ball valve fixing block 27, the secondary ball valve seat 28, the secondary ball valve cover 29 and the primary ball valve 31.

[0030] As an optional design, the vacuum adsorption device for hoisting aircraft skin is preferably provided with a scale 41 extending in the vertical direction in the middle of both sides of the outer box body 4, and the scale 41 is used to measure the displacement of the positioning plate 7 relative to the outer box body 4. The installation height of the entire vacuum adsorption device of the present invention is controlled according to the scale of the scale 41, and is positioned by the positioning bolts 6.

[0031] As an optional design, the vacuum adsorption device for hoisting aircraft skin is preferably provided with a plurality of handles 3 at intervals on the top of the top plate of the outer box body 4, so as to facilitate lifting the vacuum adsorption device for hoisting aircraft skin of the present invention through the handles 3.

[0032] As an optional design, the vacuum adsorption device for hoisting aircraft skin is preferably provided with a rubber buffer device 5 at the bottom of the top plate of the outer box body 4 to play a buffering role and prevent the top of the inner box body 10 from making hard contact with the inner wall of the outer box body 4 when the inner box body 10 is vertically lifted or lowered relative to the outer box body 4.

[0033] During operation, the height of the vacuum adsorption device of the present invention for hoisting the aircraft skin is adjusted by adjusting the installation height of the positioning plate 7 according to the curved surface characteristics of the aircraft skin, the height of the inner box 10 is adjusted by adjusting the extended length of the row rod 2, and a suitable compression spring 24 is selected for each vacuum adsorption unit. When the entire device is pressed down, the universal vacuum suction cup 22 can realize adaptive vacuum adsorption according to the curved surface shape of the skin, effectively replacing the traditional hoisting method and reducing the irregular deformation of the complex aircraft skin during the hoisting process.

[0034] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any reference numerals in the claims should not be regarded as limiting the claims involved.

[0035] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A vacuum adsorption device for hoisting aircraft skin, characterized by: It comprises an inner box body and an outer box body, wherein the inner box body is arranged inside the outer box body and is movably connected to the inner side wall of the outer box body; under the action of the driving mechanism, the inner box body can be vertically lifted and lowered relative to the outer box body in the axial direction; a plurality of vacuum adsorption units are arranged inside the inner box body, wherein the vacuum adsorption units comprise a guide cylinder, a telescopic cylinder and a universal vacuum suction cup; the upper end of the guide cylinder is connected to the top plate of the inner box body, the lower end of the guide cylinder is connected to the brake fixing plate arranged at the lower part of the inner box body, the upper end of the telescopic cylinder is passed through the guide cylinder, a compression spring is arranged between the top of the telescopic cylinder and the top of the guide cylinder, the lower end of the telescopic cylinder passes through the bottom plate of the inner box body and the bottom plate of the outer box body in turn, and is movably connected to the universal vacuum suction cup through a multi-stage ball valve; the universal vacuum suction cup can be tilted in any direction relative to the telescopic cylinder. The maximum tilt angle is equal to 60-70 degrees. A vacuum inlet is arranged in the middle of the universal vacuum suction cup. A brake device is arranged in the inner box. The brake device includes a brake line and a guide device and a brake arranged on a brake fixing plate. The lower end of the brake line is connected with the guide device and the brake in sequence, and the upper end of the brake line is connected with the buffer device. The buffer device is arranged at the bottom of the movable plate. A cylinder fixing plate is arranged above the movable plate. The cylinder fixing plate is fixedly connected to the inner wall of the inner box. A plurality of cylinders extending toward the movable plate are arranged at the bottom of the cylinder fixing plate. The cylinder body is connected to the bottom of the cylinder fixing plate, and the extending rod of the cylinder is connected to the top of the movable plate. Under the action of the cylinder, the movable plate can be lifted vertically and drive the buffer device to move synchronously.

2. The vacuum adsorption device for hoisting aircraft skin according to claim 1 is characterized in that: Positioning plates are respectively provided on both sides of the outer box body, and the positioning plates are movably connected to the outer side wall of the outer box body through matching sliders and linear guides. The positioning plates can move up and down relative to the outer box body along the linear guides. A plurality of groups of positioning holes spaced apart in the vertical direction are provided in the middle of the outer side wall of the outer box body. A plurality of positioning bolts are threadedly connected to the positioning plates, and the positioning bolts are matched with the positioning holes for positioning the positioning plates.

3. The vacuum adsorption device for hoisting aircraft skin according to claim 2 is characterized in that: The driving mechanism includes a rod motor arranged above the middle part of the outer box body. The rod of the rod motor extends vertically downward. The lower end of the rod is connected to the connecting block on the top of the inner box body through a thread. The outer wall of the inner box body is slidingly connected to the inner wall of the outer box body through a linear module. Under the action of the rod motor and the linear module, the inner box body can be vertically lifted and lowered relative to the outer box body.

4. The vacuum adsorption device for hoisting aircraft skin according to claim 2 is characterized in that: A plurality of vertically arranged guide columns are arranged between the cylinder fixing plate and the brake fixing plate. The guide columns pass through the movable plate. Linear bearings are arranged at positions corresponding to the guide columns on the movable plate. The linear bearings are slidably connected to the guide columns.

5. The vacuum adsorption device for hoisting aircraft skin according to claim 2 is characterized in that: The suction cup fixing cover on the upper part of the universal vacuum suction cup is connected to the suction cup fixing seat, the upper part of the suction cup fixing seat is threadedly connected with a first-level ball valve, the top of the first-level ball valve is threadedly connected with a first-level ball valve fixing block, a second-level ball valve cover is arranged on the upper part of the first-level ball valve, the second-level ball valve cover is threadedly connected to the second-level ball valve seat, the second-level ball valve seat is threadedly connected to the second-level ball valve fixing block, the upper surface of the first-level ball valve and the lower surface of the second-level ball valve cover are both spherical surfaces, and can cooperate with each other, the upper surface of the second-level ball valve cover and the lower surface of the first-level ball valve fixing block are both spherical surfaces, and can cooperate with each other They cooperate with each other, the lower surface of the secondary ball valve seat and the upper surface of the primary ball valve fixing block are both spherical and can cooperate with each other, the upper surface of the secondary ball valve seat and the outer surface of the bottom of the primary ball valve seat are both spherical and can cooperate with each other, the inner surface of the bottom of the primary ball valve base and the lower surface of the secondary ball valve fixing block are both spherical and can cooperate with each other, the upper part of the primary ball valve seat is connected to the lower end of the telescopic cylinder, and vacuum holes are opened in the primary ball valve seat, the secondary ball valve fixing block, the primary ball valve fixing block, the secondary ball valve seat, the secondary ball valve cover and the middle of the primary ball valve spherical surface.

6. The vacuum adsorption device for hoisting aircraft skin according to claim 2 is characterized in that: A scale extending in the vertical direction is arranged in the middle of both sides of the outer box body, and the scale is used to measure the displacement of the positioning plate moving up and down relative to the outer box body.

7. The vacuum adsorption device for hoisting aircraft skin according to claim 2 is characterized in that: A plurality of handles are arranged at intervals on the top of the top plate of the outer box body.

8. The vacuum adsorption device for hoisting aircraft skin according to claim 2 is characterized in that: A rubber buffer device is arranged at the bottom of the top plate of the outer box body.

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