Arched fuselage skin connecting hole preparation device

Abstract

The invention relates to an arched fuselage skin connecting hole preparation device which comprises a machining table, a motor and a first shaft bracket are fixed to the machining table, two first supports are symmetrically arranged on the two sides of the first shaft bracket, pipe shafts are connected to the first supports through linear bearings, drill rods are fixed to the opposite ends of the two pipe shafts, and the motor is in transmission connection with the two drill rods. A reciprocating lead screw is rotationally connected to a fixed shaft of the first shaft frame and is in transmission connection with the two pipe shafts, two sliding grooves are symmetrically formed in the positions, located on the two sides of the first shaft frame, of the machining table, clamping assemblies are arranged in the sliding grooves, a stepping mechanism is arranged on the machining table, and the stepping mechanism is in transmission connection with the two clamping assemblies. The stepping mechanism is in transmission connection with the two pipe shafts, a lubricating mechanism is arranged on the machining table, and the reciprocating lead screw is in transmission connection with the lubricating mechanism. According to the arch-shaped fuselage skin connecting hole preparation device, synchronous bidirectional automatic punching of an arch-shaped skin is achieved, the labor intensity is reduced, and the punching efficiency and consistency are improved.

Description

Technical Field

[0001] The invention relates to the field of fuselage accessory processing equipment, and in particular to a device for preparing arched fuselage skin connection holes. Background Art

[0002] The fuselage of an aircraft usually needs to be covered with a layer of skin structure. For the symmetrically laid skin structure, multiple identical connection holes need to be opened on the symmetrical sides. Since the skin has poor rigidity and is easy to change, deviations in the processing of the connection holes on both sides can easily lead to wrinkles in the skin installation, and the efficiency of single hole making is low. In view of this, we propose a device for preparing connection holes in the arched fuselage skin. Summary of the invention

[0003] The purpose of the present invention is to provide a device for preparing connection holes of an arched fuselage skin, so as to solve the problems raised in the above-mentioned background technology. To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a device for preparing connection holes of an arched fuselage skin, comprising a processing table, a motor and a shaft frame 1 are fixed on the processing table, two brackets 1 are symmetrically arranged on both sides of the shaft frame 1, a pipe shaft is connected to the bracket 1 through a linear bearing, and a drill rod is fixed on the opposite ends of the two pipe shafts, the motor is connected to the two drill rods in a transmission manner, a reciprocating screw rod is connected to the fixed axis rotation on the shaft frame 1, and the reciprocating screw rod is connected to the two pipe shafts in a transmission manner, two slide grooves are symmetrically arranged on both sides of the shaft frame 1 on the processing table, and a clamping assembly is arranged in the slide groove, a stepping mechanism is arranged on the processing table, and the stepping mechanism is connected to the two clamping assemblies in a transmission manner, the stepping mechanism is connected to the two pipe shafts in a transmission manner, a lubrication mechanism for adding lubricating oil to the linear bearings is arranged on the processing table, and the reciprocating screw rod is connected to the lubrication mechanism in a transmission manner.

[0004] Preferably, the cross-section of the shaft frame one is C-shaped, and the opening is facing the stepping mechanism. The shaft frame one is rotatably connected to a main shaft, and the two ends of the main shaft are coaxially fixedly connected to two polygonal rods. The main shaft is arranged perpendicular to the direction of the slide groove, and the two polygonal rods are respectively inserted and slidably connected in the corresponding tube shafts. The main shaft is coaxially fixedly connected to gear three, and the output shaft end of the motor is coaxially fixedly connected to gear two, and gear two is meshingly connected to gear three.

[0005] Preferably, the reciprocating screw is fixedly rotatably connected to the middle part of the shaft frame one, and the reciprocating screw is arranged perpendicular to the main shaft, the end of the reciprocating screw pointing to the main shaft is coaxially fixedly connected to gear one, and gear one is meshingly connected to gear three, and a sliding sleeve is sleeved and adapted for sliding connection on the reciprocating screw, and the outer side wall of the sliding sleeve is respectively hinged to two shaft sleeves through two connecting rods one, and the two shaft sleeves are sleeved and fixedly rotatably connected to the opposite ends of the two pipe shafts.

[0006] Preferably, the clamping assembly includes a sliding seat slidably connected in the sliding groove, and a clamp plate 2 is integrally fixed on the sliding seat, a rack 1 is fixed on the clamp plate 2, a convex ridge is fixed on the sliding seat, and a clamp plate 1 is arranged between the convex ridge and the clamp plate 2, a bolt is threadedly connected to the convex ridge, and the bolt is fixedly rotatably connected to the clamp plate 1, and avoidance holes corresponding to the punching positions of the arched skin are opened on the clamp plate 1 and the clamp plate 2.

[0007] Preferably, the stepping mechanism includes a bracket 2 fixed on the processing table, a push-pull rod is slidably connected to the bracket 2, and the push-pull rod and the reciprocating screw share the same central axis, the push-pull rod and the reciprocating screw are respectively located on both sides of the main shaft, a movable block is fixed to one end of the push-pull rod pointing to the shaft bracket 1, and the movable block is respectively hinged to the two sleeves through two connecting rods 2, and the structures of connecting rod 1 and connecting rod 2 are exactly the same.

[0008] Preferably, the stepping mechanism also includes an axis frame 2 fixed on the processing table, and the bracket 2 is located between the axis frame 1 and the axis frame 2. The axis frame 2 is rotatably connected to two shaft rods, and the two shaft rods are arranged corresponding to the two racks. The shaft rods are arranged perpendicular to the surface of the processing table, and the upper end of the shaft rod is coaxially fixedly connected to the inner ring of the ratchet, and the lower end of the shaft rod is transmission-connected to gear 4 through a pulley group, and gear 4 is rotatably connected to the processing table on a fixed axis, and gear 4 is meshingly connected to the corresponding rack 1.

[0009] Preferably, two racks 2 are fixed to one end of the push-pull rod away from the movable block, and the two racks 2 are respectively meshed and connected with the outer rings of the corresponding ratchet wheels.

[0010] Preferably, the lubrication mechanism includes a pump barrel fixed on the processing table, and a piston plate is slidably connected inside the pump barrel, the piston plate is fixedly connected to the frame through connecting rod three, and the frame is fixedly connected to the sliding sleeve, the end of the pump barrel is fixed and connected to one-way valve one and one-way valve two, one-way valve one is connected to the lubricating oil pool through conduit one, one-way valve two is connected to the pressure accumulation cylinder through conduit two, and the pressure accumulation cylinder is fixed on the processing table, the conduction direction of one-way valve one points to the inside of the pump barrel, and the conduction direction of one-way valve two points to the pressure accumulation cylinder.

[0011] Preferably, a slide plate is slidably connected to the inside of the pressure accumulator, and the slide plate is connected to the end of the pressure accumulator through a spring. The pressure accumulator is connected to the inside of the linear bearing through an oil filling pipe, and a limiting flow valve is provided on the oil filling pipe. The pressure accumulator is connected to the lubricating oil pool through conduit three, and a pressure relief valve is provided on conduit three.

[0012] Preferably, oil collecting hoppers are fixed on both sides of bracket one, and the upper end of the oil collecting hopper is fixed and connected to the sleeve, and the pipe shaft passes through the inner side of the sleeve, an oil scraper ring is fixed in the middle of the inner wall of the sleeve, and the oil scraper ring is sleeved on the outer wall of the pipe shaft, and the lower end of the oil collecting hopper is connected to the lubricating oil pool through a pipeline.

[0013] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, two symmetrical drill rods are driven by a motor to synchronously perform drilling operations on symmetrical drilling positions on the skin, and can automatically advance to the next drilling position for drilling operations, thereby realizing synchronous two-way automatic drilling of the arched skin, reducing labor intensity, and improving drilling efficiency and consistency. In addition, a lubrication mechanism is used during the drilling operation to lubricate the linear bearing to ensure smoother drilling, and the inside of the linear bearing is cooled to improve the stability and service life of the linear bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The overall cross-sectional structure of the present invention is viewed from above Figure 1 ; Figure 2 The overall cross-sectional structure of the present invention is viewed from above Figure 2 ; Figure 3 The overall cross-sectional structure of the present invention is viewed from above Figure 3 ; Figure 4 for Figure 1 AA cross-sectional structure diagram in; Figure 5 for Figure 4 The enlarged structural diagram at B in FIG. Figure 6 It is a schematic diagram of the cross-sectional structure of the pressure accumulator cylinder in the present invention.

[0015] In the figure: 1, processing table; 2, slide; 3, shaft frame 1; 4, slide seat; 5, convex edge; 6, bolt; 7, clamp plate 1; 8, avoidance hole; 9, clamp plate 2; 10, rack 1; 11, reciprocating screw; 12, sliding sleeve; 13, bracket 1; 14, pipe shaft; 15, sleeve; 16, connecting rod 1; 17, polygonal rod; 18, gear 1; 19, gear 2; 20, gear 3; 21, connecting rod 2; 22, movable block; 23, bracket 2; 24, push-pull rod; 25, rack 2; 26 , shaft frame two; 27, shaft rod; 28, ratchet; 29, pulley group; 30, gear four; 31, drill rod; 32, motor; 33, frame; 34, piston plate; 35, connecting rod three; 36, pump barrel; 37, one-way valve one; 38, guide tube one; 39, one-way valve two; 40, guide tube two; 41, pressure accumulator; 42, sleeve; 43, oil scraper ring; 44, oil collecting hopper; 45, slide plate; 46, spring; 47, oil filling pipe; 48, flow limiting valve; 49, pressure relief valve; 50, guide tube three. DETAILED DESCRIPTION

[0016] 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 technical personnel in this field without creative work are within the scope of protection of the present invention.

[0017] See also Figures 1 to 6 The present invention provides a technical solution: a device for preparing an arched fuselage skin connection hole, comprising a processing table 1, on which a motor 32 and an axis frame 3 are fixed, two brackets 13 are symmetrically arranged on both sides of the axis frame 3, a pipe shaft 14 is connected to the bracket 13 through a linear bearing, and a drill rod 31 is fixed on the opposite ends of the two pipe shafts 14, the motor 32 is transmission-connected to the two drill rods 31, a reciprocating screw rod 11 is fixedly rotatably connected to the axis frame 3, and the reciprocating screw rod 11 is transmission-connected to the two pipe shafts 14, two slide grooves 2 are symmetrically arranged on both sides of the axis frame 3 on the processing table 1, and a clamping assembly is arranged in the slide groove 2, a stepping mechanism is arranged on the processing table 1, and the stepping mechanism is transmission-connected to the two clamping assemblies, the stepping mechanism is transmission-connected to the two pipe shafts 14, a lubrication mechanism for adding lubricating oil to the linear bearing is arranged on the processing table 1, and the reciprocating screw rod 11 is transmission-connected to the lubrication mechanism.

[0018] In this embodiment, the cross section of the shaft frame 3 is C-shaped, and the opening faces the stepping mechanism. The shaft frame 3 is fixedly connected to the main shaft, and the two ends of the main shaft are coaxially fixedly connected to two multi-faceted rods 17. The main shaft and the direction of the slide 2 are arranged vertically. The two multi-faceted rods 17 are respectively inserted and slidably connected in the corresponding pipe shaft 14. The main shaft is coaxially fixedly connected to the gear three 20, and the output shaft end of the motor 32 is coaxially fixedly connected to the gear two 19. The gear two 19 is meshed with the gear three 20, and the reciprocating screw rod 11 is fixedly rotatably connected to the middle of the shaft frame 3, and the reciprocating screw 11 is vertically arranged with the main shaft, one end of the reciprocating screw 11 pointing to the main shaft is coaxially fixedly connected with a gear 18, and the gear 18 is meshingly connected with the gear three 20, and the reciprocating screw 11 is sleeved and adapted for sliding connection with a sliding sleeve 12, and the outer side wall of the sliding sleeve 12 is respectively hinged to two shaft sleeves 15 through two connecting rods 16, and the two shaft sleeves 15 are sleeved and fixedly rotatably connected to the opposite ends of the two pipe shafts 14.

[0019] In this embodiment, the clamping assembly includes a slide seat 4 slidably connected in the slide groove 2, and a clamp plate 2 9 is integrally fixed on the slide seat 4, a rack 10 is fixed on the clamp plate 2 9, a convex ridge 5 is fixed on the slide seat 4, and a clamp plate 1 7 is arranged between the convex ridge 5 and the clamp plate 2 9, a bolt 6 is threadedly connected to the convex ridge 5, and the bolt 6 is fixedly rotatably connected to the clamp plate 1 7, and both the clamp plate 1 7 and the clamp plate 2 9 are provided with avoidance holes 8 corresponding to the punching positions of the arched skin.

[0020] In this embodiment, the stepping mechanism includes a bracket 23 fixed on the processing table 1, and a push-pull rod 24 is slidably connected to the bracket 23, and the push-pull rod 24 and the reciprocating screw 11 share the same central axis. The push-pull rod 24 and the reciprocating screw 11 are respectively located on both sides of the main shaft, and a movable block 22 is fixed to one end of the push-pull rod 24 pointing to the shaft frame 3, and the movable block 22 is respectively hinged to the two sleeves 15 through two connecting rods 21, and the structures of the connecting rod 16 and the connecting rod 21 are exactly the same.

[0021] In this embodiment, the stepping mechanism also includes an axis frame 26 fixed on the processing table 1, and a bracket 23 is located between the axis frame 1 3 and the axis frame 26. Two shaft rods 27 are rotatably connected to the axis frame 26, and the two shaft rods 27 are corresponding to the two racks 10. The shaft rod 27 is arranged perpendicular to the surface of the processing table 1. The upper end of the shaft rod 27 is coaxially fixedly connected to the inner ring of the ratchet 28, and the lower end of the shaft rod 27 is connected to the gear 4 30 through a pulley group 29. The gear 4 30 is rotatably connected to the processing table 1, and the gear 4 30 is meshed with the corresponding rack 10. Two racks 25 are fixed on the end of the push-pull rod 24 away from the movable block 22, and the two racks 25 are respectively meshed with the outer rings of the corresponding ratchet 28.

[0022] In this embodiment, the lubrication mechanism includes a pump barrel 36 fixed on the processing table 1, and the pump barrel 36 is slidably connected to the piston plate 34, the piston plate 34 is fixedly connected to the frame 33 through the connecting rod 35, and the frame 33 is fixedly connected to the sliding sleeve 12, the end of the pump barrel 36 is fixed and connected to the one-way valve 1 37 and the one-way valve 2 39, the one-way valve 1 37 is connected to the lubricating oil pool through the conduit 1 38, the one-way valve 2 39 is connected to the pressure storage cylinder 41 through the conduit 2 40, and the pressure storage cylinder 41 is fixed on the processing table 1, the conduction direction of the one-way valve 1 37 points to the inside of the pump barrel 36, the conduction direction of the one-way valve 2 39 points to the pressure storage cylinder 41, and the inside of the pressure storage cylinder 41 is slidably connected with a slide plate 45, The slide plate 45 is connected to the end of the pressure accumulator 41 through a spring 46. The pressure accumulator 41 is connected to the inside of the linear bearing through an oil filling pipe 47, and a limiting flow valve 48 is provided on the oil filling pipe 47. The pressure accumulator 41 is connected to the lubricating oil pool through a conduit three 50. The lubricating oil pool is not drawn in the present application, and a pressure relief valve 49 is provided on the conduit three 50. Oil collecting hoppers 44 are fixed on both sides of the bracket 13, and the upper end of the oil collecting hopper 44 is fixed and connected to the sleeve 42, and the pipe shaft 14 passes through the inner side of the sleeve 42, and an oil scraper ring 43 is fixed to the middle part of the inner wall of the sleeve 42, and the oil scraper ring 43 is sleeved on the outer wall of the pipe shaft 14, and the lower end of the oil collecting hopper 44 is connected to the lubricating oil pool through a pipeline.

[0023] Working principle and advantages of the present invention: When the arched fuselage skin connection hole preparation device is used, the working process is as follows: like Figures 1 to 6 As shown, the symmetrical sides of the arched skin are placed between the clamping plate 1 7 and the clamping plate 2 9 in the two groups of clamping assemblies, and the punching positions of the connecting holes are adjusted to correspond to each avoidance hole one by one. Then, the bolt 6 is rotated to make the clamping plate 1 7 close to the skin and cooperate with the clamping plate 2 9 to clamp and fix the skin. The position of the slide 4 is adjusted so that the drill rod 31 corresponds to the first punching position. The motor 32 is started to work so that the motor 32 drives the gear 3 20 and the main shaft to rotate through the gear 2 19, so that the main shaft drives the two pipe shafts 14 and the drill rod 31 thereon to rotate synchronously through the polygonal rods 17 at both ends. While the gear 3 20 rotates, it drives the reciprocating gear 3 20 through the gear 1 18. The reciprocating screw 11 rotates, thereby causing the reciprocating screw 11 to drive the sleeve 12 to reciprocate on the reciprocating screw 11. When the sleeve 12 approaches the shaft frame 3, the sleeve 12 pushes the two sleeves 15 and the pipe shaft 14 away from each other through the two connecting rods 16, so that the pipe shaft 14 drives the drill rod 31 to drill the corresponding drilling positions, thereby realizing synchronous two-way drilling of the arched skin, ensuring consistent drilling, and improving work efficiency. When the sleeve 12 moves away from the shaft frame 3, the sleeve 12 pushes the two sleeves 15 and the pipe shaft 14 towards each other through the two connecting rods 16, so that the pipe shaft 14 drives the drill rod 31 away from the corresponding drilling position and resets.

[0024] As described above, when the two shaft sleeves 15 move away from each other, the movable block 22 is driven to move toward the shaft frame 3 through the two connecting rods 21, so that the movable block 22 drives the two racks 25 to move toward the shaft frame 3 through the push-pull rod 24. During this process, the rack 25 cannot drive the shaft rod 27 to rotate through the ratchet 28, and then cannot drive the rack 10 to move through the gear 4 30, ensuring that the slide 4 remains stationary during drilling to avoid drilling deviation. When the two shaft sleeves 15 move away from each other, the movable block 22 is driven to move away from the shaft frame 3 through the two connecting rods 21, so that the movable block 22 drives the two racks 25 to move away from the shaft frame 3 through the push-pull rod 24. When the drill rod 31 exits the avoidance hole 8 on the splint 29 and the distance is greater than 1 cm (after the drill rod 31 exits the avoidance hole 8 When the hole 8 is made and the distance is less than or equal to 1 cm, the rack 25 does not contact the outer ring of the ratchet 28, which makes it easy to adjust the position of the slide 4 in the slide groove 2 so as to adjust the punching position to correspond to the drill rod 31). The rack 25 is just meshed with the outer ring of the corresponding ratchet 28. At this time, the rack 25 drives the shaft 27 to rotate through the ratchet 28, so that the shaft 27 drives the gear 4 30 to rotate through the pulley set 29, and then the gear 4 30 drives the splint 29 and the slide 4 to move through the rack 10. When the sliding sleeve 12 just changes direction to approach the shaft frame 1 3, the drill rod 31 just corresponds to the next punching position. This cycle causes the drill rod 31 to automatically advance to drill the next connecting hole, thereby realizing automatic punching, reducing labor intensity, and improving punching efficiency and consistency.

[0025] As mentioned above, in the process of the sliding sleeve 12 approaching the shaft frame 13, the sliding sleeve 12 drives the piston plate 34 to generate a suction force on the pump barrel 36 through the frame 33 and the connecting rod 35. Since the conducting direction of the one-way valve 1 37 points to the inside of the pump barrel 36, and the conducting direction of the one-way valve 2 39 points to the pressure accumulator 41, the suction force sucks the lubricating oil in the lubricating oil pool into the pump barrel 36 through the conduit 1 38. In the process of the sliding sleeve 12 moving away from the shaft frame 13, the sliding sleeve 12 drives the piston plate 34 to generate a suction force on the pump barrel 36 through the frame 33 and the connecting rod 35. The piston plate 34 generates a compressive force in the pump barrel 36, and the compressive force transports the lubricating oil pool in the pump barrel 36 to the pressure accumulator 41 through the conduit 2 40, so that the lubricating oil in the pressure accumulator 41 is transported to the inside of the linear bearing through the oil filling pipe 47 under the action of the spring 46 and the slide plate 45, so as to ensure that the tube shaft 14 moves more smoothly in the linear bearing, and also cool the inside of the linear bearing to improve the stability and service life of the linear bearing. The flow limiting valve 48 avoids the problem of waste caused by excessive injection of lubricating oil.

[0026] When excess lubricating oil appears in the pressure accumulator 41, the pressure relief valve 49 opens and flows back to the lubricating oil pool through the conduit 3 50. During the reciprocating movement of the pipe shaft 14, the scraper ring 43 scrapes off the excess lubricating oil on the surface of the pipe shaft 14 and collects it through the oil collecting hopper 44, and then recovers it to the lubricating oil pool through the pipeline, which can reduce consumption and prevent the lubricating oil from dripping onto the processing table 1, making it convenient to clean and manage the processing table 1.

[0027] After completing the drilling of the connecting holes, the bolt 6 is rotated in the reverse direction to loosen the skin of the clamp plate 7, and the skin can be removed. The operation is simple and convenient.

[0028] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0029] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A device for preparing connection holes of an arched fuselage skin, comprising a processing table (1), characterized in that: A motor (32) and a shaft frame (3) are fixed on the processing table (1); two brackets (13) are symmetrically arranged on both sides of the shaft frame (3); a tube shaft (14) is connected to the bracket (13) via a linear bearing, and drill rods (31) are fixed to opposite ends of the two tube shafts (14); the motor (32) is connected to the two drill rods (31) in a transmission manner; a reciprocating screw rod (11) is connected to the shaft frame (3) in a fixed axis rotation manner, and the reciprocating screw rod (11) is connected to the two The tube shaft (14) is transmission connected, two slide grooves (2) are symmetrically arranged on both sides of the shaft frame (3) on the processing table (1), and a clamping assembly is arranged in the slide groove (2), a stepping mechanism is arranged on the processing table (1), and the stepping mechanism is transmission connected to the two clamping assemblies, the stepping mechanism is transmission connected to the two tube shafts (14), a lubrication mechanism for adding lubricating oil to the linear bearing is arranged on the processing table (1), and the reciprocating screw (11) is transmission connected to the lubrication mechanism.

2. The device for preparing connection holes of an arched fuselage skin according to claim 1, characterized in that: The cross section of the shaft frame one (3) is C-shaped, and the opening faces the stepping mechanism. The shaft frame one (3) is fixedly connected to a main shaft, and the two ends of the main shaft are coaxially fixedly connected to two multi-faceted rods (17). The main shaft is arranged perpendicular to the direction of the slide groove (2). The two multi-faceted rods (17) are respectively inserted and slidably connected in the corresponding pipe shaft (14). The main shaft is coaxially fixedly connected to gear three (20), and the output shaft end of the motor (32) is coaxially fixedly connected to gear two (19), and gear two (19) is meshingly connected with gear three (20).

3. The device for preparing the connection hole of the arched fuselage skin according to claim 2, characterized in that: The reciprocating screw rod (11) is rotatably connected to the middle part of the shaft frame (3) in a fixed axis manner, and the reciprocating screw rod (11) is arranged perpendicular to the main shaft. The end of the reciprocating screw rod (11) pointing to the main shaft is coaxially fixedly connected to the gear (18), and the gear (18) is meshingly connected to the gear (20). The reciprocating screw rod (11) is sleeved and slidably connected with a sliding sleeve (12), and the outer side wall of the sliding sleeve (12) is respectively hinged to two shaft sleeves (15) through two connecting rods (16). The two shaft sleeves (15) are sleeved and rotatably connected to the opposite ends of the two pipe shafts (14).

4. The device for preparing the connection hole of the arched fuselage skin according to claim 3, characterized in that: The clamping assembly comprises a slide seat (4) slidably connected in the slide groove (2), and a second clamp plate (9) is integrally fixed on the slide seat (4), a rack one (10) is fixed on the second clamp plate (9), a convex ridge (5) is fixed on the slide seat (4), and a clamp plate one (7) is arranged between the convex ridge (5) and the second clamp plate (9), a bolt (6) is threadedly connected on the convex ridge (5), and the bolt (6) is rotatably connected to the first clamp plate (7) in a fixed axis, and avoidance holes (8) corresponding to the punching positions of the arched skin are opened on the first clamp plate (7) and the second clamp plate (9).

5. The device for preparing the connection hole of the arched fuselage skin according to claim 4, characterized in that: The stepping mechanism comprises a bracket 2 (23) fixed on the processing table (1), a push-pull rod (24) is slidably connected to the bracket 2 (23), and the push-pull rod (24) and the reciprocating screw (11) share the same central axis. The push-pull rod (24) and the reciprocating screw (11) are respectively located on both sides of the main shaft, and a movable block (22) is fixed to one end of the push-pull rod (24) pointing to the shaft bracket 1 (3), and the movable block (22) is respectively hinged to the two shaft sleeves (15) through two connecting rods 2 (21), and the connecting rod 1 (16) and the connecting rod 2 (21) have exactly the same structure.

6. The device for preparing connection holes of an arched fuselage skin according to claim 5, characterized in that: The stepping mechanism also includes a shaft frame 2 (26) fixed on the processing table (1), the bracket 2 (23) is located between the shaft frame 1 (3) and the shaft frame 2 (26), the shaft frame 2 (26) is connected to two shaft rods (27) on a fixed axis rotationally, and the two shaft rods (27) are arranged corresponding to the two racks 1 (10), the shaft rods (27) are arranged perpendicular to the surface of the processing table (1), the upper end of the shaft rod (27) is coaxially fixedly connected to the inner ring of the ratchet (28), the lower end of the shaft rod (27) is connected to the gear 4 (30) through a pulley group (29), and the gear 4 (30) is connected to the processing table (1) on a fixed axis rotationally, and the gear 4 (30) is meshingly connected to the corresponding rack 1 (10).

7. The device for preparing connection holes of an arched fuselage skin according to claim 6, characterized in that: Two racks (25) are fixed to one end of the push-pull rod (24) away from the movable block (22), and the two racks (25) are respectively meshed and connected with the outer rings of corresponding ratchet wheels (28).

8. The device for preparing connection holes of an arched fuselage skin according to claim 3, characterized in that: The lubrication mechanism comprises a pump barrel (36) fixed on the processing table (1), and a piston plate (34) is slidably connected inside the pump barrel (36), the piston plate (34) is fixedly connected to the frame (33) through a connecting rod three (35), and the frame (33) is fixedly connected to the sliding sleeve (12), the end of the pump barrel (36) is fixed and connected to a one-way valve (37) and a one-way valve (39), the one-way valve (37) is connected to a lubricating oil pool through a conduit one (38), the one-way valve (39) is connected to a pressure storage cylinder (41) through a conduit two (40), and the pressure storage cylinder (41) is fixed on the processing table (1), the conduction direction of the one-way valve (37) points to the inside of the pump barrel (36), and the conduction direction of the one-way valve (39) points to the pressure storage cylinder (41).

9. The device for preparing connection holes of an arched fuselage skin according to claim 8, characterized in that: The pressure accumulator (41) is slidably connected to a slide plate (45) inside, and the slide plate (45) is connected to the end of the pressure accumulator (41) via a spring (46). The pressure accumulator (41) is connected to the inside of the linear bearing via an oil filling pipe (47), and a flow limiting valve (48) is provided on the oil filling pipe (47). The pressure accumulator (41) is connected to a lubricating oil pool via a conduit three (50), and a pressure relief valve (49) is provided on the conduit three (50).

10. The device for preparing connection holes of an arched fuselage skin according to claim 9, characterized in that: An oil collecting hopper (44) is fixed to both sides of the bracket (13), and the upper end of the oil collecting hopper (44) is fixed to and communicates with the sleeve (42), and the pipe shaft (14) passes through the inner side of the sleeve (42), an oil scraper ring (43) is fixed to the middle of the inner wall of the sleeve (42), and the oil scraper ring (43) is sleeved on the outer side wall of the pipe shaft (14), and the lower end of the oil collecting hopper (44) is connected to the lubricating oil pool through a pipeline.

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