A device for eliminating residual stress of aircraft skin panels

Abstract

The present invention relates to a residual stress elimination device for aircraft skin panels, comprising a base, and also comprising a pre-stretching mechanism arranged on the base, a clamping assembly is arranged on the pre-stretching mechanism, a back plate is fixed on the base through a stand, a reciprocating driving mechanism is arranged on the back plate, a frame is arranged on the reciprocating driving mechanism, a plurality of hammers are arranged in the frame, the reciprocating driving mechanism drives the frame to move back and forth while driving the plurality of hammers to knock the skin panels, two pump barrels are fixed on the back plate, a slide barrel is fixed on the base, a rack is arranged in the slide barrel, the two pump barrels are connected to the inside of the slide barrel through a pipeline, the reciprocating driving mechanism intermittently conveys air pressurized in the slide barrel through the two pump barrels, so that the rack drives the pre-stretching mechanism to intermittently stretch the skin panels. This type of residual stress elimination device for aircraft skin panels realizes the knocking-stretching-knocking-stretching multiple removal of residual stress, greatly improving the stress relief effect on the skin panels.

Description

Technical Field

[0001] The invention relates to the technical field of aviation material production, in particular to a device for eliminating residual stress of an aircraft skin plate. Background Art

[0002] During the aircraft development process, due to the requirement of weight reduction, some skin panels and belly panels need to be milled on a large area. After milling, they will have large deformations to varying degrees. If they are forced to be assembled, there will be great stress problems, and there will be serious problems such as a large number of agitated deformation areas and poor surface quality. Therefore, in order to solve the milling deformation and surface quality problems of these parts, the most important thing is to eliminate or reduce their residual stress during the production process of thin plates. In view of this, we propose a residual stress elimination device for aircraft skin panels. Summary of the invention

[0003] The purpose of the present invention is to provide a residual stress elimination device for aircraft skin panels to solve the problems raised in the above background technology. To achieve the above purpose, the present invention provides the following technical solutions: a residual stress elimination device for aircraft skin panels, comprising a base, and also comprising a pre-stretching mechanism arranged on the base, the pre-stretching mechanism is provided with a clamping assembly for clamping and fixing the skin panel, a back plate is fixed to the base through a stand, a reciprocating drive mechanism is provided on the back plate, and a frame is provided on the reciprocating drive mechanism, a plurality of hammers are provided in the frame, the reciprocating drive mechanism drives the frame to move back and forth while driving the plurality of hammers to knock the skin panel, two pump barrels are fixed on the back plate, a slide barrel is fixed on the base, and a rack is provided in the slide barrel, the two pump barrels are connected to the inside of the slide barrel through a pipeline, the reciprocating drive mechanism intermittently conveys air to pressurize the slide barrel through the two pump barrels, so that the rack drives the pre-stretching mechanism to intermittently stretch the skin panel.

[0004] Preferably, the pre-stretching mechanism includes a stretching bed fixed on a base, and an axle seat is fixed on the stretching bed, an axle rod one passes through the axle seat and is rotatably connected to the axle rod, one end of the axle rod one is coaxially fixedly connected to a gear, and the axle rod one is provided with two threaded sections with opposite rotation directions, the axle rod one is threadedly connected to two sliding sleeves through the two threaded sections with opposite rotation directions, and a sliding groove corresponding to the two sliding sleeves is provided on the stretching bed, a slider is fixed on the sliding sleeve, and the slider is slidably connected in the corresponding sliding groove.

[0005] Preferably, the clamping assembly comprises two clamping frames, the two clamping frames are respectively fixed on the two sliding sleeves through two connecting rods, a clamping plate is arranged in the clamping frame, and both ends of the clamping plate are slidably connected in guide grooves opened on both sides of the clamping frame.

[0006] Preferably, a threaded rod is provided on the inner side of the clamping frame, the two sections of threads on the threaded rod have opposite rotation directions, and the threaded rod is threadedly connected to two screw sleeves through the two sections of threads thereon, the screw sleeves are hinged to the upper surface of the clamping plate through connecting rod 2, and the screw sleeves are hinged to the bottom surface of the upper frame inside the clamping frame through connecting rod 3, and the two connecting rods 2 are arranged in a positive "eight" shape, and the two connecting rods 3 are arranged in an inverted "eight" shape.

[0007] Preferably, the reciprocating drive mechanism includes a pulley one and a pulley two which are rotatably connected to the back plate with a fixed axis, and the pulley one and the pulley two have the same structure, the pulley two is connected to the motor transmission fixed on the back plate, the pulley one and the pulley two are arranged at the same horizontal height, a strip through hole is opened on the back plate, and the length of the strip through hole is arranged parallel to the center line connecting the pulley one and the pulley two.

[0008] Preferably, a sliding seat is connected by sliding in the strip through hole, and a fixed axis on the sliding seat is rotatably connected to pulley three, pulley four and pulley five, pulley one, pulley two, pulley three, pulley four and pulley five are connected by belt transmission, and the belt is U-shaped when it passes around pulley three, pulley five and pulley four in sequence.

[0009] Preferably, a reciprocating screw is rotatably connected to the back plate, and the center lines of the reciprocating screw and pulley one and pulley two are arranged parallel to each other. The reciprocating screw passes through the slide and is slidably connected to the slide. The fixed-axis rotation on the back plate is connected to shaft rod three, the upper end of shaft rod three is transmission connected to pulley one through bevel gear set one, and the lower end of shaft rod three is transmission connected to one end of the reciprocating screw through bevel gear set two.

[0010] Preferably, a horizontal plate is fixed in the frame, and a plurality of hammer rods are penetrated and slidably connected to the horizontal plate, and the plurality of hammer rods are arranged in one-to-one correspondence with the plurality of hammer heads, and the hammer heads are fixed to the corresponding lower ends of the hammer rods, and a pressure plate is fixed to the upper ends of the hammer rods, and the pressure plate is connected to the horizontal plate through spring 2. A shaft rod 2 is rotatably connected to the frame, and one end of the shaft rod 2 is transmission-connected to pulley 5 through a sprocket assembly, and a plurality of shift rods corresponding to the pressure plate are fixed on the shaft rod 2.

[0011] Preferably, the two pump barrels are located at the two ends of the strip through hole and arranged opposite to each other, a piston plate is slidably connected in the pump barrel, a sliding rod is fixed on the piston plate, and the end of the sliding rod away from the piston plate can be in buckle contact with the sliding seat, the piston plate is connected to one end of the pump barrel through spring three, one-way valve one and one-way valve two are fixed and connected on the pump barrel, one-way valve two is connected to the branch pipe, the conducting direction of one-way valve one points to the inside of the pump barrel, and the conducting direction of one-way valve two points to the branch pipe.

[0012] Preferably, a slide plate is slidably connected inside the slide cylinder, and the slide plate is connected to the upper end of the slide cylinder through a spring, the lower end of the rack is fixed on the slide plate, the bottom of the slide cylinder is fixed and connected to the regulating valve and the air pipe, and the two branch pipes are connected to the air pipe.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] In the present invention, the skin plate is clamped and fixed by a clamping assembly, and then a reciprocating drive mechanism drives a hammer to knock the skin plate, so that the slide seat alternately pressurizes the air intermittently delivered in the slide cylinder through two pump barrels, so that the rack drives the pre-stretching mechanism to intermittently stretch the skin plate, thereby achieving knocking-stretching-knocking-stretching multiple times to remove residual stress, thereby greatly improving the stress relief effect on the skin plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the general assembly cross-sectional structure of the present invention;

[0016] Figure 2 for Figure 1 A is an enlarged structural diagram;

[0017] Figure 3 for Figure 1 Schematic diagram of BB cross-section structure;

[0018] Figure 4 It is a schematic diagram of the cross-sectional structure of the clamping frame in the present invention;

[0019] Figure 5 for Figure 2 Schematic diagram of CC cross-section structure;

[0020] Figure 6 It is a schematic diagram of the pulley structure in the present invention.

[0021] In the figure: 1, base; 2, stretching bed; 3, shaft seat; 4, shaft rod 1; 5, sliding sleeve; 6, slide groove; 7, slider; 8, clamping frame; 9, connecting rod 1; 10, gear; 11, rack; 12, slide cylinder; 13, slide plate; 14, spring 1; 15, regulating valve; 16, air pipe; 17, stand; 18, back plate; 19, pump barrel; 20, strip through hole; 21, slide seat; 22, frame; 23, pulley 1; 24, pulley 2; 25, belt; 26, pulley 3; 27, pulley 4; 28, Pulley five; 29, sprocket assembly; 30, reciprocating screw; 31, shaft rod two; 32, shift rod; 33, cross plate; 34, hammer rod; 35, hammer head; 36, pressure plate; 37, spring two; 38, clamping plate; 39, guide groove; 40, threaded rod; 41, connecting rod two; 42, connecting rod three; 43, screw sleeve; 44, shaft rod three; 45, bevel gear set one; 46, bevel gear set two; 47, one-way valve one; 48, one-way valve two; 49, branch pipe; 50, piston plate; 51, sliding rod; 52, spring three. DETAILED DESCRIPTION

[0022] 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.

[0023] See also Figures 1 to 6 The present invention provides a technical solution: a residual stress elimination device for aircraft skin panels, comprising a base 1, and also comprising a pre-stretching mechanism arranged on the base 1, the pre-stretching mechanism is provided with a clamping assembly for clamping and fixing the skin panel, a back plate 18 is fixed to the base 1 through a stand 17, a reciprocating driving mechanism is provided on the back plate 18, and a frame 22 is provided on the reciprocating driving mechanism, a plurality of hammer heads 35 are provided in the frame 22, the reciprocating driving mechanism drives the frame 22 to move back and forth while driving the plurality of hammer heads 35 to knock the skin panel, two pump barrels 19 are fixed on the back plate 18, a slide barrel 12 is fixed on the base 1, and a rack 11 is provided in the slide barrel 12, the two pump barrels 19 are connected with the inside of the slide barrel 12 through a pipeline, the reciprocating driving mechanism intermittently conveys air to pressurize the slide barrel 12 through the two pump barrels 19, so that the rack 11 drives the pre-stretching mechanism to intermittently stretch the skin panel.

[0024] In this embodiment, the pre-stretching mechanism includes a stretching bed 2 fixed on a base 1, and an axle seat 3 is fixed on the stretching bed 2, a shaft rod 4 passes through the shaft seat 3 and is rotatably connected to the shaft rod 4, one end of the shaft rod 4 is coaxially fixedly connected to a gear 10, and the shaft rod 4 is provided with two threaded sections with opposite rotation directions, the shaft rod 4 is threadedly connected to two sliding sleeves 5 through the two threaded sections with opposite rotation directions, and a sliding groove 6 corresponding to the two sliding sleeves 5 is provided on the stretching bed 2, a sliding block 7 is fixed on the sliding sleeve 5, and the sliding block 7 is slidably connected in the corresponding sliding groove 6.

[0025] In this embodiment, the clamping assembly includes two clamping frames 8, and the two clamping frames 8 are respectively fixed on the two sliding sleeves 5 through two connecting rods 9. A clamping plate 38 is arranged in the clamping frame 8, and the two ends of the clamping plate 38 are slidably connected in the guide grooves 39 opened on both sides of the inside of the clamping frame 8. A threaded rod 40 is arranged on the inner side of the clamping frame 8. The two sections of threads on the threaded rod 40 have opposite rotation directions, and the threaded rod 40 is threadedly connected to two screw sleeves 43 through the two sections of threads thereon. The screw sleeve 43 is hinged to the upper surface of the clamping plate 38 through the connecting rod 2 41, and the screw sleeve 43 is hinged to the bottom surface of the upper frame inside the clamping frame 8 through the connecting rod 3 42, and the two connecting rods 2 41 are arranged in a positive "eight" shape, and the two connecting rods 3 42 are arranged in an inverted "eight" shape.

[0026] In this embodiment, the reciprocating drive mechanism includes a pulley 1 23 and a pulley 24 which are rotatably connected to the back plate 18, and the pulley 1 23 and the pulley 2 24 have the same structure. The pulley 24 is connected to the motor fixed on the back plate 18. The motor is not drawn in this application. The pulley 1 23 and the pulley 2 24 are arranged at the same horizontal height. A strip through hole 20 is provided on the back plate 18, and the length of the strip through hole 20 is parallel to the center line of the pulley 1 23 and the pulley 2 24. A slide seat 21 is slidably connected in the strip through hole 20, and the slide seat 21 is rotatably connected to the pulley 3 26, the pulley 4 27 and the pulley 5 28 on the fixed axis. Useful To wrap around the annular groove of the belt 25, the pulley 1 23, the pulley 24, the pulley 3 26, the pulley 4 27 and the pulley 5 28 are connected by the belt 25 transmission, and the belt 25 is U-shaped when it passes around the pulley 3 26, the pulley 5 28 and the pulley 4 27 in sequence. The back plate 18 is rotatably connected with a reciprocating screw rod 30, and the center connecting lines of the reciprocating screw rod 30 and the pulley 1 23 and the pulley 24 are arranged parallel to each other. The reciprocating screw rod 30 passes through the slide 21 and is slidably connected to the slide 21. The fixed axis rotation on the back plate 18 is connected to the shaft rod 3 44, and the upper end of the shaft rod 3 44 is transmission connected to the pulley 1 23 through the bevel gear set 1 45, and the lower end of the shaft rod 3 44 is transmission connected to one end of the reciprocating screw rod 30 through the bevel gear set 2 46.

[0027] In this embodiment, a horizontal plate 33 is fixed in the frame 22, and a plurality of hammer rods 34 are penetrated and slidably connected to the horizontal plate 33, and the plurality of hammer rods 34 are arranged in a one-to-one correspondence with the plurality of hammer heads 35, and the hammer heads 35 are fixed to the corresponding lower ends of the hammer rods 34, and a pressure plate 36 is fixed to the upper ends of the hammer rods 34, and the pressure plate 36 is connected to the horizontal plate 33 through a spring 2 37, and a shaft rod 2 31 is rotatably connected to the frame 22, and one end of the shaft rod 2 31 is transmission-connected to the pulley 5 28 through a sprocket assembly 29, and a plurality of shift rods 32 corresponding to the pressure plate 36 are fixed on the shaft rod 2 31.

[0028] In this embodiment, the two pump barrels 19 are located at the two ends of the strip through hole 20 and are arranged opposite to each other. A piston plate 50 is slidably connected in the pump barrel 19, and a sliding rod 51 is fixed on the piston plate 50, and the end of the sliding rod 51 away from the piston plate 50 can be in contact with the sliding seat 21, and the piston plate 50 is connected to one end of the pump barrel 19 through a spring three 52. A one-way valve 47 and a one-way valve 48 are fixed and connected to the pump barrel 19, and the one-way valve 48 is connected to the branch pipe 49. The conduction direction of the one-way valve 47 points to the inside of the pump barrel 19, and the conduction direction of the one-way valve 48 points to the branch pipe 49. A slide plate 13 is slidably connected in the slide barrel 12, and the slide plate 13 is connected to the upper end of the slide barrel 12 through a spring one 14. The lower end of the rack 11 is fixed on the slide plate 13, and the bottom of the slide barrel 12 is fixed and connected to the regulating valve 15 and the air pipe 16, and the two branch pipes 49 are connected to the air pipe 16.

[0029] Working principle and advantages of the present invention: When the aircraft skin panel residual stress elimination device is used, the working process is as follows:

[0030] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the skin plate to be processed is passed under the clamping plate 38 in the clamping frame 8 and under each hammer head 35, and then the threaded rod 40 is rotated so that the threaded rod 40 drives the two screw sleeves 43 to move away from each other through the threaded transmission thereon, so that the connecting rod 2 41 and the connecting rod 3 42 tend to a straight line state, and then the clamping plate 38 moves down in the guide groove 39 and clamps the skin plate. At this time, the motor is started to drive the motor to rotate the pulley 2 24, so that the pulley 2 24 drives the pulley 1 23, the pulley 3 26, the pulley 5 28 and the pulley 4 27 to rotate through the belt 25, wherein the pulley 1 23 rotates and drives the shaft rod 3 44 to rotate through the bevel gear set 1 45, so that the shaft rod 3 44 is driven by the bevel gear set 1 The wheel set 2 46 drives the reciprocating screw 30 to rotate, so that the reciprocating screw 30 drives the slide 21 to move reciprocatingly in the strip through hole 20, and then the slide 21 synchronously drives the frame 22 to move reciprocatingly. While the frame 22 moves reciprocatingly, the pulley 5 28 drives the shaft rod 2 31 to rotate through the sprocket assembly 29, so that the shaft rod 2 31 synchronously drives each lever 32 to rotate. When the lever 32 contacts the corresponding pressure plate 36, pressure is applied to the pressure plate 36, so that the pressure plate 36 compresses the spring 2 37 so that the spring 2 37 obtains a restoring force. At the same time, the pressure plate 36 drives the hammer head 35 to knock the skin plate through the hammer rod 34, so as to release the residual stress in the skin plate, and this cycle is repeated.

[0031] When the slide seat 21 moves to the left end of the strip through hole 20 and contacts the corresponding slide rod 51, a thrust is applied to the slide rod 51, so that the slide rod 51 drives the piston plate 50 to move left in the pump barrel 19, and the piston plate 50 stretches the spring three 52, so that the spring three 52 obtains a restoring force, and the piston plate 50 applies a compressive force to the air in the pump barrel 19. Since the conducting direction of the one-way valve 1 47 points to the inside of the pump barrel 19, and the guiding direction of the one-way valve 2 48 points to the branch pipe 49, the compression force transports the air in the pump barrel 19 to the slide barrel 12 through the branch pipe 49 and the air pipe 16, so that the air pressure in the slide barrel 12 increases, and the slide plate 13 drives the rack 11 to move upward, so that the rack 11 drives the shaft rod 14 to rotate through the gear 10, thereby making the shaft rod 1-4 drives the two sleeves 5 away from each other through threaded transmission, and the two sleeves 5 drive the two clamping frames 8 away from each other through the connecting rod 1-9, so that the skin plate after the knocking is stretched to remove the residual stress again. When the slide 21 moves to the leftmost end and starts to move to the right, as mentioned above, the hammer head 35 knocks the skin plate again, and when the slide 21 buckles and applies thrust to the slide rod 51 on the right side, the piston plate 50 in the corresponding pump barrel 19 transports the air in the pump barrel 19 to the slide barrel 12 through the branch pipe 49 and the air pipe 16, so that the rack 11 drives the shaft rod 1-4 to rotate again through the gear 10, so that the skin plate is stretched again through the two clamping frames 8, realizing knocking-stretching-knocking-stretching multiple times to remove residual stress, thereby greatly improving the stress relief effect on the skin plate.

[0032] When the residual stress is removed, turn off the motor and rotate the threaded rod 40 in the opposite direction so that the two screw sleeves 43 move away from each other and the clamping plate 38 loosens the skin plate. Then, the skin plate can be removed from the frame 22 and the clamping frame 8. Finally, open the regulating valve 15 so that the slide plate 13 drives the rack 11 to move down and reset under the action of the spring 14, so that the rack 11 drives the shaft rod 4 to rotate in the opposite direction through the gear 10, and then the shaft rod 4 drives the two sleeves 5 to move closer to each other and reset, so as to perform stress relief operation on the next skin plate.

[0033] 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.

[0034] 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.

[0035] 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 residual stress elimination device for aircraft skin panels, comprising a base (1), characterized in that: The invention also includes a pre-stretching mechanism disposed on the base (1), wherein the pre-stretching mechanism is provided with a clamping assembly for clamping and fixing the skin plate, the back plate (18) is fixed to the base (1) via a stand (17), the back plate (18) is provided with a reciprocating drive mechanism, and the reciprocating drive mechanism is provided with a frame (22), a plurality of hammer heads (35) are provided in the frame (22), and the reciprocating drive mechanism drives the frame (22) to move back and forth while driving the plurality of hammer heads (35) The skin plate is struck, two pump barrels (19) are fixed on the back plate (18), a slide barrel (12) is fixed on the base (1), and a rack (11) is arranged inside the slide barrel (12), the two pump barrels (19) are connected to the inside of the slide barrel (12) through a pipeline, and the reciprocating drive mechanism intermittently conveys air to pressurize the slide barrel (12) through the two pump barrels (19), so that the rack (11) drives the pre-stretching mechanism to intermittently stretch the skin plate; The pre-stretching mechanism comprises a stretching bed (2) fixed on a base (1), and an axle seat (3) is fixed on the stretching bed (2), a shaft rod (4) passes through the shaft seat (3) and is rotatably connected to the shaft rod, one end of the shaft rod (4) is coaxially fixedly connected to a gear (10), and the shaft rod (4) is provided with two threaded sections with opposite rotation directions, the shaft rod (4) is threadedly connected to two sliding sleeves (5) through the two threaded sections with opposite rotation directions, the stretching bed (2) is provided with sliding grooves (6) corresponding to the two sliding sleeves (5), a slider (7) is fixed on the sliding sleeve (5), and the slider (7) is slidably connected in the corresponding sliding groove (6); The clamping assembly comprises two clamping frames (8), the two clamping frames (8) being fixed to the two sliding sleeves (5) respectively via two connecting rods (9), a clamping plate (38) being arranged inside the clamping frame (8), and two ends of the clamping plate (38) being slidably connected to guide grooves (39) provided on both sides of the inside of the clamping frame (8); A threaded rod (40) is arranged inside the clamping frame (8), the two threads on the threaded rod (40) are in opposite directions, and the threaded rod (40) is threadedly connected to two screw sleeves (43) through the two threads on the threaded rod (40), the screw sleeves (43) are hinged to the upper surface of the clamping plate (38) through the second connecting rod (41), and the screw sleeves (43) are hinged to the bottom surface of the upper frame inside the clamping frame (8) through the third connecting rod (42), and the two second connecting rods (41) are arranged in a positive "eight" shape, and the two third connecting rods (42) are arranged in an inverted "eight" shape; The reciprocating drive mechanism comprises a first pulley (23) and a second pulley (24) which are fixedly rotatably connected to a back plate (18), and the first pulley (23) and the second pulley (24) have the same structure, the second pulley (24) is transmission-connected to a motor fixed to the back plate (18), the first pulley (23) and the second pulley (24) are arranged at the same horizontal height, the back plate (18) is provided with a strip-shaped through hole (20), and the length direction of the strip-shaped through hole (20) is arranged parallel to the center line connecting the first pulley (23) and the second pulley (24).

2. The residual stress elimination device for aircraft skin panels according to claim 1 is characterized in that: The strip-shaped through hole (20) is slidably connected to a slide seat (21), and the slide seat (21) is fixedly rotatably connected to a pulley three (26), a pulley four (27) and a pulley five (28); the pulley one (23), the pulley two (24), the pulley three (26), the pulley four (27) and the pulley five (28) are connected through a belt (25), and the belt (25) is U-shaped when it passes around the pulley three (26), the pulley five (28) and the pulley four (27) in sequence.

3. The residual stress elimination device for aircraft skin panels according to claim 2 is characterized in that: A reciprocating screw rod (30) is rotatably connected to the back plate (18), and the center lines of the reciprocating screw rod (30) and the pulley 1 (23) and the pulley 2 (24) are arranged parallel to each other. The reciprocating screw rod (30) passes through the slide seat (21) and is slidably connected to the slide seat (21). The fixed axis on the back plate (18) is rotatably connected to the shaft rod 3 (44). The upper end of the shaft rod 3 (44) is transmission-connected to the pulley 1 (23) through the bevel gear set 1 (45), and the lower end of the shaft rod 3 (44) is transmission-connected to one end of the reciprocating screw rod (30) through the bevel gear set 2 (46).

4. The residual stress elimination device for aircraft skin panels according to claim 2 is characterized in that: A transverse plate (33) is fixed in the frame (22), and a plurality of hammer rods (34) are passed through and slidably connected to the transverse plate (33), and the plurality of hammer rods (34) are arranged in a one-to-one correspondence with the plurality of hammer heads (35), and the hammer heads (35) are fixed to the lower ends of the corresponding hammer rods (34). A pressure plate (36) is fixed to the upper ends of the hammer rods (34), and the pressure plate (36) is connected to the transverse plate (33) via a second spring (37). A second shaft rod (31) is rotatably connected to the frame (22), and one end of the second shaft rod (31) is transmission-connected to a fifth pulley (28) via a sprocket assembly (29), and a plurality of shifting rods (32) corresponding to the pressure plates (36) are fixed to the second shaft rod (31).

5. The residual stress elimination device for aircraft skin panels according to claim 2, characterized in that: The two pump barrels (19) are located at the two ends of the strip through hole (20) and are arranged opposite to each other. A piston plate (50) is slidably connected inside the pump barrel (19). A sliding rod (51) is fixed on the piston plate (50), and the end of the sliding rod (51) away from the piston plate (50) can be in contact with the sliding seat (21). The piston plate (50) is connected to one end of the pump barrel (19) through a spring three (52). A one-way valve (47) and a one-way valve (48) are fixed on the pump barrel (19) and are connected. The one-way valve (48) is connected to a branch pipe (49). The conduction direction of the one-way valve (47) points to the inside of the pump barrel (19), and the conduction direction of the one-way valve (48) points to the branch pipe (49).

6. The residual stress elimination device for aircraft skin panels according to claim 5, characterized in that: The slide cylinder (12) is slidably connected to a slide plate (13), and the slide plate (13) is connected to the upper end of the slide cylinder (12) via a spring 1 (14). The lower end of the rack (11) is fixed on the slide plate (13). The bottom of the slide cylinder (12) is fixed and connected to the regulating valve (15) and the air pipe (16). The two branch pipes (49) are connected to the air pipe (16).

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