A clamping device for aircraft skin curved surface machining

Abstract

The present invention relates to the technical field of clamping devices, and particularly relates to a clamping device for aircraft skin curved surface machining, which comprises a plurality of monomer modules, and the plurality of monomer modules are assembled with each other to form the clamping device; the monomer module comprises an assembly plate, an adsorption component, a lifting component, and a flipping driving mechanism, and the assembly plate is used to realize the assembly between two adjacent monomer modules; the adsorption component comprises a central block and a plurality of movable modules arranged around the central block, the movable modules extend and expand towards the outside of the central block, and vacuum suction cups are arranged on the tops of both the movable modules and the central block; the clamping device further comprises a locking mechanism for locking two adjacent assembly plates to keep the two adjacent assembly plates in an assembled state. The present invention can effectively reduce problems such as elastic deformation, obvious vibration, and chatter of the skin workpiece during machining.

Description

Technical Field

[0001] The present invention relates to the technical field of clamping devices, and particularly relates to a clamping device for machining the curved surface of an aircraft skin. Background Art

[0002] In civil aircraft and civil aviation manufacturing, the skin, as an important component of the aircraft body structure, is one of the core parts. Aircraft skin parts are important load-bearing components that make up the external structure of the aircraft. They have single-curvature and double-curvature shapes, are large and complex in structure, have thin walls and are prone to deformation, require high shape accuracy, include structural features such as surfaces, depressions, through-windows, holes, etc., and in addition, have the characteristics of variable cross-sections and unequal thicknesses, making them difficult to manufacture.

[0003] Considering the factors of comprehensive processing efficiency, processing quality, and processing cost, the general processing method for traditional aircraft skin parts is the manufacturing process of overall blank forming plus chemical finishing. Since the chemical milling manufacturing process is complex, has poor process coordination, high difficulty in recovering metals, high power consumption, high risk of combustion and explosion, and the waste chemical milling fluid pollutes the environment, it does not meet the requirements of green manufacturing; therefore, the aviation industry has been seeking green and precise skin manufacturing technologies that can replace chemical milling. With the development of metal cutting theory, the rise of modern multi-axis numerical control machining technology, and the continuous improvement of flexible clamping technology, the mechanical machining cutting process has become the preferred alternative processing method.

[0004] In the mechanical machining process, the clamping and positioning of the skin become a key technology. If conventional mechanical machining processes and clamping and positioning methods are used, it will cause large clamping deformation, and the reliability of the part processing quality is almost zero; therefore, for the processing of skin parts, a full-size conforming profiling tooling is often designed to completely conform the bottom of the skin to the tooling plate, thereby improving the rigidity of the skin during the processing. However, the manufacturing cycle of this tooling is long and includes processes such as blanking, rough machining, heat treatment, finish machining, and surface hardening; moreover, this tooling is only applicable to one type of skin. Once the model changes, there will be a direct risk of discarding the tooling, increasing the operating cost of the enterprise.

[0005] Therefore, in related technologies, flexible tooling has become the preferred solution for the mechanical machining process of skin parts. For example, a multi-point vacuum adsorption flexible clamping system. For instance, the invention patent application with the application number CN202011382702.2 discloses an adaptive fixture suitable for complex curved surface machining.

[0006] For such a multi-point vacuum adsorption flexible clamping system, generally, a vacuum suction cup is installed on an electric push rod or a cylinder, and the vacuum suction cup is pushed vertically by the cylinder or the electric push rod; the vacuum suction cups are discretely distributed in the entire tooling. Considering the occupancy limit factors such as the electric push rod or the cylinder, there will be a large gap between two adjacent vacuum suction cups, and this gap position is equivalent to a suspended area. When the tool processes directly above the vacuum suction cup, it can obtain good support; while when the tool processing path enters the clamped suspended area, the skin part will inevitably undergo elastic deformation, obvious machining vibration, and even chatter due to the loss of longitudinal support; the above phenomena will directly lead to an increase in machining depth error, obvious vibration marks on the machining surface, and unsatisfactory surface roughness of the part.

[0007] Moreover, for the existing such multi-point vacuum adsorption flexible clamping tooling, the vacuum suction cup part can only be flipped passively and cannot be actively adjusted. For some skin workpieces with large curvature changes, it is obviously difficult to adapt only by the passive rotation adjustment of the vacuum suction cup, so it still needs to be improved. Summary of the Invention

[0008] In order to solve at least one technical problem mentioned in the background art, the purpose of the present invention is to provide a clamping device for machining the curved surface of an aircraft skin.

[0009] To achieve the above purpose, the present invention provides the following technical solutions:

[0010] A clamping device for machining the curved surface of an aircraft skin, comprising a plurality of monomer modules, and the plurality of monomer modules are assembled with each other to form the clamping device; each monomer module includes:

[0011] An assembly plate for realizing the assembly between two adjacent monomer modules;

[0012] An adsorption component, including a central block and a plurality of movable modules arranged around the central block. The movable modules extend and expand outward from the central block, and the movable modules can rotate vertically relative to the central block; a first driving member for driving the movable module to rotate relative to the central block is arranged between each movable module and the central block; vacuum suction cups are arranged on the tops of the movable modules and the central block.

[0013] A lifting member arranged on the assembly plate for driving the adsorption component to move along the Z-axis direction;

[0014] A flipping driving mechanism arranged between the lifting member and the adsorption component for driving the whole adsorption component to rotate around a first axis and a second axis, wherein the first axis and the second axis are perpendicular to each other, and both the first axis and the second axis are perpendicular to the Z-axis direction;

[0015] The clamping device further includes a locking mechanism for locking two adjacent assembled plates so that the two adjacent assembled plates remain in the assembled state.

[0016] Compared with the prior art, the advantages of adopting this solution are as follows:

[0017] First of all, in this solution, movable modules are arranged around the central block, and the movable modules extend and expand outward from the central block. In this way, during assembly, the occupation of lower components such as lifting components can be avoided, so that the adsorption components in each monomer module can be embedded and close to each other during assembly. Furthermore, the gap between two adjacent monomer modules is small. In this way, by arranging the vacuum suction cups on the central block and the movable modules, the distance between the vacuum suction cups can be small as a whole. In this way, the suspended area during clamping is very small and can almost be ignored, so that an excellent supporting effect can be achieved on the skin, thereby effectively reducing problems such as elastic deformation, obvious vibration, and chatter of the skin workpiece during processing.

[0018] Secondly, in this solution, the adsorption component can be driven to rotate by the flipping drive mechanism, and at the same time, the movable module can also be driven by the first driving member to rotate relative to the central block. In this way, the vacuum suction cup can be actively adjusted in angle by the flipping drive mechanism and the first driving member. Compared with the traditional passive adaptation method, it can obviously better adapt to the curved surface of the adsorbed skin.

[0019] In addition, in this solution, the movable module is arranged to be driven by the first driving member to rotate relative to the central block, so that the movable module can be adjusted in angle relative to the central block, so as to better adapt to the curvature of the curved surface of the skin, thereby achieving a better adsorption and clamping effect.

[0020] Finally, the clamping device provided in this solution is formed by assembling several monomer modules. In this way, the number of monomer modules can be selected to be increased or decreased according to the size of the skin to adapt to the size of the skin. For example, when the skin is larger, more monomer modules can be selected for assembly to increase the size of the clamping device to adapt to the skin; on the contrary, if the skin is smaller, a small number of monomer modules can be selected for assembly.

[0021] Preferably, the movable module includes at least two movable blocks, and vacuum suction cups are arranged on each movable block; the at least two movable blocks are connected in sequence, and the movable block close to the central block is driven to rotate by the first driving member; the two adjacent movable blocks can rotate relative to each other vertically, and a second driving member is arranged between the two adjacent movable blocks to drive the two to rotate relative to each other through the second driving member.

[0022] Preferably, the first driving member and / or the second driving member is a motor.

[0023] Preferably, the flipping drive mechanism includes a first motor and a second motor. The first motor is installed on the top of the lifting member and is used to drive the second motor to rotate around a first axis; the second motor is installed at the bottom of the central block and is used to drive the entire adsorption assembly to rotate around a second axis.

[0024] Preferably, the locking mechanism includes a screw, a nut, a pressing block, and two sets of connecting rods; mounting holes vertically extending for the screw to pass through are provided at the joint positions of adjacent two assembled plates; the pressing block is movably inserted along the axial direction of the screw on the screw; the connecting rod includes a first arm and a second arm rotatably connected at one end, the other end of the first arm is rotatably connected to the pressing block; a connecting block is rotatably connected to the other end of the second arm; in the assembled state of adjacent two assembled plates, the screw is vertically inserted into the mounting hole and the head end of the screw abuts against the bottom wall of the assembled plate, the connecting blocks on the two connecting rods are respectively connected to adjacent two assembled plates, and the nut is fitted on the screw and presses the pressing block downward.

[0025] Preferably, semi-circular holes are provided on the butting surfaces of adjacent two assembled plates, and in the assembled state, the semi-circular holes on the butting surfaces of the two assembled plates enclose to form the mounting hole.

[0026] Preferably, the connecting block is bolted to the assembled plate.

[0027] Preferably, on the butting surfaces of adjacent two assembled plates, a plug rod is provided on one of them, and a jack is provided on the other. In the assembled state, the plug rod is inserted into the jack to relatively position the two assembled plates in the vertical direction.

[0028] Preferably, in the assembled state, the first axis directions of all single modules are the same, and / or the second axis directions of all single modules are the same.

[0029] Preferably, the lifting member is one of an electric push rod, a cylinder, and a hydraulic cylinder.

[0030] Other advantages and effects of the present invention are specifically explained in the specific implementation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a structural schematic diagram of the present invention;

[0032] Figure 2 is a structural schematic diagram of a single single module;

[0033] Figure 3 is an exploded view of the single module;

[0034] Figure 4 is a split view when two single modules are assembled;

[0035] Figure 5It is a schematic structural view of the assembled state of two monomer modules;

[0036] Figure 6 It is a schematic structural view of the locking mechanism;

[0037] Figure 7 It is the front view of the locking mechanism. Specific embodiments

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] Embodiment 1

[0040] Please refer to Figure 1-7 As shown, this embodiment provides a clamping device for aircraft skin surface machining. In essence, this embodiment is a flexible vacuum adsorption tooling, which is mainly used to adsorb and clamp the skin during machining.

[0041] For the convenience of description, with reference to Figure 1 As shown, taking the three-axis coordinates shown in Figure 1 as an example, the X-axis, Y-axis, and Z-axis are defined, and the Z-axis direction can also be understood as the vertical direction.

[0042] This embodiment includes a number of monomer modules. As shown in Figure 1 a number of monomer modules can be assembled with each other to form the clamping device; such a setting makes the clamping device provided in this embodiment more adaptable. Specifically, the number of monomer modules can be selected according to the size of the skin to make it adapt to the size of the skin. For example, when the skin is larger, more monomer modules can be selected for assembly to increase the size of the clamping device to adapt to the skin; on the contrary, if the skin is smaller, a small number of monomer modules can be selected for assembly.

[0043] In this embodiment, the structures of the monomer modules are basically the same. Therefore, for the convenience of description, one of the monomer modules is taken as an example for description:

[0044] Combined with Figure 2 and Figure 3 as shown, the monomer module includes an assembly plate 1, an adsorption component 2, and a lifting component, and the following is a specific description of each component.

[0045] The assembly plate 1 is used to realize the assembly between adjacent monomer modules. In other words, two adjacent monomer modules rely on their respective assembly plates 1 to be spliced with each other to realize the assembly between the two monomer modules.

[0046] In this embodiment, the structure of the assembled plate 1 is preferably a square structure. During assembly, the assembled plates 1 are butt-jointed and assembled in sequence along the X-axis direction and the Y-axis direction.

[0047] In order to enable each assembled plate 1 to maintain the assembled state after assembly, in this embodiment, a locking mechanism 5 is further included, which is used to lock adjacent two assembled plates 1 to keep the adjacent two assembled plates 1 in the assembled state, as Figure 5 shown in the state.

[0048] The adsorption assembly is mainly used to adsorb and hold the skin, as Figure 2 and Figure 3 shown. It includes a central block 21 and a number of movable modules 22 provided around the central block 21. The movable modules 22 extend and expand outward from the central block 21. In this embodiment, it is preferably that the central block 21 is basically in a square structure. There are four groups of movable modules 22, which are respectively located at the four peripheral wall positions of the central block 21, so that the movable modules 22 and the central block 21 form a "cross" shape distribution as a whole, as Figure 2 shown in the state.

[0049] It should be noted that the fact that the movable module 22 extends and expands outward from the central block 21 in this embodiment means that the movable module 22 has an extension outward from the central block 21, so that the movable module 22 extends out of the periphery of the lifting member. In this way, it is ensured that during assembly, the occupancy of the lower components such as the lifting member can be avoided, so that the adsorption assemblies in each single module can be embedded and close to each other during assembly. The embedding method can be:

[0050] One of the movable modules 22 in one single module is embedded in the interval area between two adjacent movable modules 22 in another single module, and so on. Finally, the gap between two adjacent single modules can be made smaller. In this way, by arranging the vacuum suction cups 20 on the central block 21 and the movable modules 22, the distance between the vacuum suction cups 20 as a whole can be made smaller (at this time, all the vacuum suction cups 20 are equivalent to forming a series of relatively dense adsorption points). In this way, the suspended area during clamping is very small and can almost be ignored, so that an excellent supporting effect can be achieved on the skin, thereby effectively reducing problems such as elastic deformation, obvious vibration, and chatter of the skin workpiece during processing.

[0051] It can be understood that according to the above assembly method, as Figure 1 shown, there will be some areas where there are no single modules, which is equivalent to having a vacant area at this time. In order to realize the overall connection of the assembled plate 1, an independent assembled plate 1 can be filled in this vacant area according to the assembly method of the normal assembled plate 1. This assembled plate 1 can refer to Figure 1 shown in part a.

[0052] In this embodiment, as Figure 3As shown, the movable module 22 can rotate vertically relative to the central block 21. In other words, the movable module 22 can rotate about a rotation axis perpendicular to the Z-axis direction.

[0053] A first driving member for driving the movable module 22 to rotate relative to the central block 21 is provided between each movable module 22 and the central block 21; a plurality of vacuum suction cups 20 are provided on the tops of the movable module and the central block 21. In this embodiment, specifically shown is that there are 4 vacuum suction cups 20 provided on the central block 21. It can be understood that there is a certain interval between two adjacent movable modules 22 to ensure that the movable module 22 has a rotation space.

[0054] In this embodiment, the movable module 22 is arranged to be driven by the first driving member to rotate relative to the central block 21, so that the movable module can adjust the angle relative to the central block 21, which is equivalent to being able to make small local adjustments, enabling it to better adapt to the curvature of the skin surface, thereby achieving a better adsorption and clamping effect.

[0055] A lifting member is provided on the assembly plate 1 for driving the adsorption assembly to move in the Z-axis direction, so as to adjust the overall height of the adsorption assembly 2 to adapt to the skin surface; in this embodiment, the lifting member preferably adopts an electric push rod 3, which is vertically fixed on the assembly plate 1; of course, in other alternative embodiments, the lifting member can also be a component with a lifting function such as a cylinder or a hydraulic cylinder.

[0056] As Figure 3 shown, a flipping drive mechanism is provided between the lifting member and the adsorption assembly 2 for driving the adsorption assembly to rotate as a whole about a first axis and a second axis, wherein the first axis and the second axis are perpendicular to each other, and both the first axis and the second axis are perpendicular to the Z-axis direction.

[0057] For the convenience of program control, in this embodiment, as Figure 1 shown, in the assembled state, the first axis directions of all single modules are the same, and the second axis directions of all single modules are the same. In this embodiment, the extending direction of the first axis can be understood as the X-axis direction, and the extending direction of the second axis can be understood as the Y-axis direction.

[0058] In this embodiment, the structures of the movable modules 22 are basically the same. Therefore, one of the movable modules 22 is taken as an example for illustration in this embodiment:

[0059] As Figure 2 and Figure 3 shown, the movable module 22 includes at least two movable blocks 221. Theoretically, the more the number of movable blocks 221, the more adjustable points there are, and thus the better the use effect. In this embodiment, the case of using two movable blocks 221 is shown, specifically as follows:

[0060] Vacuum suckers 20 are provided on each of the movable blocks 221. The movable blocks 221 are basically in the structure of rectangular blocks. Two vacuum suckers 20 are arranged on the top of each movable block 221. In addition, in this embodiment, the vacuum suckers 20 on the movable blocks 221 are connected to the movable blocks 221 by ball heads, so that the vacuum suckers 20 can rotate freely relative to the movable blocks 221 within a certain range; and the vacuum suckers 20 on the central block 21 are also connected to the central block 21 by ball heads, so that the vacuum suckers 20 can rotate freely relative to the central block 21 within a certain range; in this way, the vacuum suckers 20 can rotate passively to better fit and adsorb the curved surface of the skin.

[0061] As Figure 3 shown, the two movable blocks 221 are connected in sequence, and the movable block 221 close to the central block 21 is driven to rotate by the first driving member; the adjacent two movable blocks 221 in the same movable module can also rotate relative to each other vertically, and a second driving member is provided between the adjacent two movable blocks 221 to drive the two to rotate relative to each other through the second driving member.

[0062] In this embodiment, the first driving member and the second driving member are stepping motors. For the sake of distinction, in this embodiment, as Figure 3 shown, the first driving member is denoted as the first driving motor 211, and the second driving member is denoted as the second driving motor 222.

[0063] The specific connection structure is as follows; as Figure 3 shown, taking the movable module 22 on one side of the central block 21 as an example, the first driving motor 211 is fixed on the side wall of the central block 21 on this side, and its main shaft is fixedly connected to the movable block 221 close to the central block 21. In this way, the first driving motor 211 rotates to drive the movable block 221 to rotate; the second driving motor 222 is fixedly arranged on the side wall of the movable block 221 away from the central block 21, and the main shaft of the second driving motor 222 is fixed to another movable block 221, and the second driving motor 222 drives the other movable block 221 to rotate.

[0064] In this embodiment, the specific structure of the flipping driving mechanism is as follows: as Figure 3 shown, it includes a first motor 41 and a second motor 42, and both the first motor 41 and the second motor 42 are stepping motors; the first motor 41 is installed on the top of the lifting member to drive the second motor 42 to rotate around the first axis; the second motor 42 is installed at the bottom of the central block 21 to drive the entire adsorption assembly to rotate around the second axis. Specifically;

[0065] The first motor 41 is fixed to the top of the electric push rod 3. A turning plate 43 is fixedly connected to the main shaft of the first motor 41. The second motor 42 is fixed to the turning plate 43. A fixing plate 44 is fixed to the main shaft of the second motor 42. The fixing plate 44 is fixed to the bottom wall of the central block 21.

[0066] In this embodiment, as Figure 4 shown, on the butting surfaces of two adjacent assembling plates 1, where the butting surfaces refer to the surfaces where the two assembling plates 1 are in contact with each other, a plug rod 13 is fixedly provided on one of them, and a jack 14 is provided on the other. In the assembled state, the plug rod 13 is inserted into the jack 14 so that the two assembling plates 1 are relatively positioned in the vertical direction.

[0067] In this embodiment, at least one of the locking mechanisms 5 is provided between two adjacent assembling plates 1. The structures of the locking mechanisms 5 are the same. Therefore, one of the locking mechanisms 5 is taken as an example in this embodiment for specific description:

[0068] As Figure 4 and Figure 5 shown, the locking mechanism 5 includes a screw rod 51, a nut 52, a pressing block 53 and two groups of connecting rods 54; an installation hole 10 extending vertically for the screw rod 51 to pass through is formed at the joint position of two adjacent assembling plates 1; the pressing block 53 is movably sleeved on the screw rod 51 along the axial direction of the screw rod 51; the connecting rod 54 includes a first branch arm 541 and a second branch arm 542 which are rotatably connected at one end. The other end of the first branch arm 541 is rotatably connected to the pressing block 53; the other end of the second branch arm 542 is rotatably connected with a connecting block 55; when two adjacent assembling plates 1 are in the assembled state, as Figure 5 shown in the state, the screw rod 51 passes through the installation hole 10 vertically and the head end of the screw rod 51 abuts against the bottom wall of the assembling plate 1. The connecting blocks 55 on the two connecting rods 54 are respectively connected to two adjacent assembling plates 1. The nut 52 is fitted on the screw rod 51 and presses the pressing block 53 downward.

[0069] When locking, the screw rod 51 is passed through the installation hole 10 from bottom to top;

[0070] Then, the pressing block 53 and the nut 52 are sleeved on the screw rod 51 in sequence. Then, the connecting blocks 55 on the two connecting rods 54 are respectively fixed to the two assembling plates 1. The specific connection manner between the connecting block 55 and the assembling plate 1 can be:

[0071] The connecting block 55 is connected to the assembling plate 1 by bolts 56. Specifically, a threaded hole 12 for the threaded connection of the bolts 56 is formed in the assembling plate 1, and the bolts 56 pass through the connecting block 55 and are screwed into the threaded hole 12.

[0072] Then, the nut 52 is rotated to make the nut 52 move downward continuously to push and press the pressing plate. In this way, the pressing plate generates a pressing force on the connecting rod 54. As Figure 7As shown in the figure, finally, a downward-inclined thrust F is generated on the second arm 542. This thrust F will form a vertically downward component force F1 and a horizontally oriented component force F2. Since the two connecting blocks 55 are respectively installed on the two assembly plates 1, the directions of the component forces F2 formed by the two second arms 542 are opposite. Thus, under the action of these two component forces F2, the two assembly plates 1 will have a tendency to be squeezed together, and in this way, the two assembly plates 1 are firmly abutted against each other.

[0073] Moreover, since the head end of the screw 51 abuts against the bottom of the assembly plate 1, as the nut 52 is tightened, the head end of the screw 51 will generate an upward thrust on the assembly plate 1. At this time, in cooperation with the downward component force F1, the two assembly plates 1 can be vertically clamped at the joint position of the two assembly plates 1, which helps to improve the firmness of the assembly.

[0074] Since the screw 51 needs to pass through the joint position of the two assembly plates 1, in this embodiment, semi-circular holes 11 are provided on the butting surfaces of adjacent two assembly plates 1. In the assembled state, the semi-circular holes 11 on the butting surfaces of the two assembly plates 1 enclose to form the installation hole 10.

[0075] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention.

Claims

1. A clamping device for aircraft skin curved surface machining, characterized in that, it includes a number of single modules, and the number of single modules are assembled with each other to form the clamping device; the single module includes: An assembly plate for realizing the assembly between two adjacent single modules; An adsorption component, including a central block and a number of movable modules arranged around the central block, the movable modules extend and expand outward from the central block, and the movable modules can rotate vertically relative to the central block; a first driving member for driving the movable module to rotate relative to the central block is provided between each movable module and the central block; vacuum suction cups are provided on the tops of the movable module and the central block; A lifting member arranged on the assembly plate for driving the adsorption component to move along the Z-axis direction; A flipping driving mechanism arranged between the lifting member and the adsorption component for driving the whole adsorption component to rotate around a first axis and a second axis, wherein the first axis and the second axis are perpendicular to each other, and both the first axis and the second axis are perpendicular to the Z-axis direction; The clamping device further includes a locking mechanism for locking two adjacent assembly plates so that the two adjacent assembly plates maintain the assembled state.

2. The clamping device for aircraft skin curved surface machining according to claim 1, characterized in that, The movable module includes at least two movable blocks, and vacuum suction cups are provided on the movable blocks; the at least two movable blocks are connected in sequence, and the movable block close to the central block is driven to rotate by the first driving member; adjacent two movable blocks can rotate relative to each other vertically, and a second driving member is provided between the adjacent two movable blocks to drive the two to rotate relative to each other through the second driving member.

3. The clamping device for aircraft skin curved surface machining according to claim 2, characterized in that, The first driving member and / or the second driving member is a motor.

4. The clamping device for aircraft skin curved surface machining according to claim 1, characterized in that, The flipping driving mechanism includes a first motor and a second motor, the first motor is installed on the top of the lifting member for driving the second motor to rotate around the first axis; the second motor is installed at the bottom of the central block for driving the whole adsorption component to rotate around the second axis.

5. The clamping device for aircraft skin curved surface machining according to claim 1, characterized in that, The locking mechanism includes a screw, a nut, a pressing block and two groups of connecting rods; mounting holes vertically extending for the screw to pass through are opened at the joint positions of two adjacent assembly plates; the pressing block is movably inserted along the axial direction of the screw on the screw; the connecting rod includes a first branch arm and a second branch arm which are rotatably connected at one end, and the other end of the first branch arm is rotatably connected to the pressing block; the other end of the second branch arm is rotatably connected with a connecting block; when two adjacent assembly plates are in the assembled state, the screw vertically passes through the mounting hole and the head end of the screw abuts against the bottom wall of the assembly plate, the connecting blocks on the two connecting rods are respectively connected to the two adjacent assembly plates, and the nut is fitted on the screw and presses the pressing block downward.

6. The clamping device for aircraft skin curved surface machining according to claim 5, characterized in that, Semicircular holes are provided on the butting surfaces of two adjacent assembled plates. In the assembled state, the semicircular holes on the butting surfaces of the two assembled plates enclose to form the installation hole.

7. A clamping device for aircraft skin surface machining according to claim 6, characterized in that, the connecting block is bolted to the assembled plate.

8. A clamping device for aircraft skin surface machining according to claim 6 or 7, characterized in that, on the butting surfaces of two adjacent assembled plates, one is provided with a plug rod and the other is provided with a socket hole. In the assembled state, the plug rod is inserted into the socket hole to relatively position the two assembled plates in the vertical direction.

9. A clamping device for aircraft skin surface machining according to claim 1, characterized in that, in the assembled state, the first axis directions of all single modules are the same, and / or the second axis directions of all single modules are the same.

10. A clamping device for aircraft skin surface machining according to claim 1, characterized in that, the lifting component is one of an electric push rod, a cylinder, and a hydraulic cylinder.

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