Rotary positioning and tightening device and method for undercarriage

Abstract

The invention provides a rotary positioning and tightening device and method for an undercarriage. The undercarriage rotary positioning and tightening device comprises a butt joint device and an adjusting device, the butt joint device comprises a second base and a tightening mechanism moving along the second base on the X axis, the tightening mechanism comprises a first base, a tightening shaft and a tightening sleeve, the first base is slidably connected to the second base, and the tightening shaft is slidably connected to the second base. The tightening shaft is installed on the first base, the power output end of the tightening shaft is connected with the tightening sleeve in a sleeved mode, and the first base is further connected with a push plate used for axially pushing out the tightening sleeve. The adjusting device is provided with a clamping cavity capable of being opened and closed, the clamping cavity rotates to achieve a first position and a second position, when the clamping cavity is located at the first position, the clamping cavity corresponds to the tightening sleeve in position, and when the clamping cavity is located at the second position, the clamping cavity deviates from the tightening sleeve. The automatic tightening device is suitable for automatic tightening of narrow fasteners of the undercarriage, multi-person operation is not needed, and efficiency and safety are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of landing gear processing, and in particular to a landing gear rotation positioning tightening device and method. Background Art

[0002] During the assembly process of the aircraft landing gear, the fasteners on it need to be installed with constant force. The constant force installation increases the friction between the fasteners and the connecting parts, which can prevent the fasteners from loosening within a certain range. In addition, the fasteners are installed with a constant torque to ensure that the compression seals reach the preset compression amount of the seals, thereby ensuring the sealing of the product structure. If the tightening torque does not meet the requirements, the fasteners will loosen, the connection will be unreliable, or the seals will not be compressed enough and leak. Therefore, the constant force installation of landing gear fasteners has high requirements and must be strictly controlled.

[0003] Due to the special structure of the existing landing gear, the fastener installation position is high and narrow, which requires the cooperation of multiple people and auxiliary tools to climb up and cooperate with each other to complete the operation. It is difficult to operate and there are hidden dangers to operational safety. Summary of the invention

[0004] The object of the present invention is to provide a landing gear rotation positioning tightening device and method, which is suitable for automatic tightening of fasteners in a narrow space of the landing gear, does not require multiple people to operate, and improves efficiency and safety.

[0005] The technical solution of the present invention is: a landing gear rotation positioning tightening device, including a docking device and an adjustment device arranged beside the docking device, the docking device includes a second base and a tightening mechanism displaced along the second base on the X-axis, the tightening mechanism includes a first base, a tightening shaft and a tightening sleeve, the first base is slidably connected to the second base, the tightening shaft is installed on the first base, the power output end of the tightening shaft is sleeved with the tightening sleeve, and the first base is also connected to a push plate for axially pushing the tightening sleeve out; the adjustment device is provided with a clamping cavity that can be opened and closed, the clamping cavity rotates to achieve a first position and a second position, when in the first position, the clamping cavity corresponds to the position of the tightening sleeve, and when in the second position, the clamping cavity deviates from the tightening sleeve.

[0006] Preferably, the push plate is connected to the first base via an elastic member, and the elastic member always outputs thrust to ensure that the push plate is in constant contact with the tightening sleeve.

[0007] Preferably, the elastic member includes a plurality of telescopic rods and a plurality of springs, the plurality of springs are arranged around the push plate, and a telescopic rod is arranged between every two springs in the vertical direction and / or the lateral direction of the push plate.

[0008] Preferably, the tightening sleeve is radially fixed to the power output end of the tightening shaft and slides axially.

[0009] Preferably, one end of the tightening sleeve is provided with a flange adapted to the push plate.

[0010] Preferably, the docking device also includes a column, a second base arranged on the top of the column, and a slide rail arranged on the upper end of the second base and extending along the X direction, the first base is adapted to the slide rail, a driving cylinder is connected between the second base and the first base, and the column is placed next to the adjustment device.

[0011] Preferably, the adjustment device includes a third base, a fourth base raised and lowered on one side of the third base in the Y direction by a lifting mechanism, a clamping mechanism arranged on the fourth base and rotated by a rotating mechanism, the clamping cavity is arranged on the clamping mechanism, and the third base is placed next to the docking device.

[0012] Preferably, the clamping mechanism includes a base plate mounted on the rotating mechanism, a first driving mechanism connected to the base plate, and two first clamping jaws connected to the first driving mechanism, wherein the first driving mechanism is used to drive the two first clamping jaws thereon to open and close, and the clamping cavity is formed between the two first clamping jaws.

[0013] Preferably, the clamping mechanism also includes a connecting seat connected to one end of the substrate, and two connecting seats are arranged on the substrate at intervals. The end of each connecting seat is connected to a second clamping jaw through a second driving mechanism, and the clamping cavity is formed between the two second clamping jaws. The opening and closing directions of the two second clamping jaws are consistent with the opening and closing directions of the two first clamping jaws.

[0014] The present invention also provides a method for tightening pre-fixed parts on a landing gear, which is performed using the above-mentioned landing gear rotation positioning tightening device, comprising: The landing gear rotation positioning tightening device is driven to return to the initial position: the tightening mechanism of the docking device is retracted to the side away from the adjustment device, and the clamping cavity on the adjustment device is placed in the second position and is in an open state; The tightening sleeve is sleeved on the power output end of the tightening shaft, and the end surface of the tightening sleeve is in contact with the push plate; the landing gear is clamped in the clamping cavity and the clamping cavity is closed to limit the landing gear; Starting the adjustment device to drive the clamping cavity and the landing gear thereon to rotate until they reach the first position and stop; The docking device is started to drive the tightening mechanism to move in the X direction, so that the tightening sleeve extends into the landing gear and contacts the pre-fixed part; if the tightening sleeve forces the push plate to be subjected to a force opposite to its thrust, the tightening mechanism is started to rotate at a first speed until the thrust of the push plate is completely released, so that the tightening sleeve is completely sleeved on the pre-fixed part of the landing gear; Start the tightening and rotating the tightening mechanism at the second speed to drive the tightening sleeve to tighten the pre-fixed parts; after completion, first return the tightening mechanism to the initial position, then return the adjustment device to the initial position, and remove the landing gear; the first speed is lower than the second speed.

[0015] Compared with the related art, the present invention has the following beneficial effects: 1. The landing gear rotation positioning tightening device drives the tightening sleeve thereon to extend into the landing gear to dock with the fastener and drive the tightening sleeve to rotate to tighten the fastener through the displacement of the docking device in the X direction and the output torque. The tightening sleeve can be inserted into the narrow working space; Second, the position alignment of the tightening sleeve is achieved by the thrust output by the push plate. If the push plate is subjected to a force opposite to its thrust, the tightening sleeve is under pressure and not installed in place. At this time, the tightening mechanism can be rotated and adjusted until the thrust of the push plate is sufficient, thereby achieving automatic alignment without manual visual inspection of the angle. In addition, the tightening sleeve is withdrawn when no visual inspection is required, which greatly improves the operating efficiency and product quality, reduces the difficulty of assembly, and improves the assembly accuracy. 3. The setting adjustment device has a first position and a second position by means of rotation. In the second position, it is convenient for positioning and clamping the landing gear. In the first position, the landing gear and the tightening sleeve are placed on the same axis, which is beneficial to the tightening work of the tightening sleeve and the sensing of the fixed force value, thereby ensuring the effective and reliable connection of the fasteners and ensuring that the seals reach the preset compression amount (the tightening force is neither too large to cause fatigue damage to the seals nor too small to cause seal leakage), thereby ensuring the sealing of the product structure.

[0016] Fourth, the clamping claws forming the clamping cavity on the adjustment device can not only rotate, but also rise and fall, further improving the precise docking between the landing gear and the tightening sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of the landing gear rotation positioning tightening device provided by the present invention; Figure 2 for Figure 1 A schematic diagram of the structure of the docking device in FIG. Figure 3 A schematic diagram of a tightening sleeve being installed on a tightening mechanism; Figure 4 for Figure 3 A cross-sectional view of Figure 5 for Figure 1 Schematic diagram of the structure of the adjustment device.

[0018] In the accompanying drawings: 1. docking device; 11. tightening mechanism; 111. first base; 112. tightening shaft; 1121. positioning shaft; 113. tightening sleeve; 1131. flange; 114. push plate; 115. elastic member; 1151. telescopic rod; 1152. spring; 12. second base; 13. column; 14. slide rail; 15. drive cylinder; 2. adjustment device; 21. lifting mechanism; 22. frame; 23. rotating mechanism; 24. clamping mechanism; 241. base plate; 242. first driving mechanism; 243. first clamping jaw; 244. second driving mechanism; 245. second clamping jaw; 246. connecting seat; 27. clamping cavity. DETAILED DESCRIPTION

[0019] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear in the following, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.

[0020] like Figure 1 As shown, a landing gear rotation positioning and tightening device provided in this embodiment includes a docking device 1 and an adjustment device 2 which are spaced apart in the X direction.

[0021] like Figure 2 As shown, the docking device 1 includes a tightening mechanism 11, a second base 12, a column 13, a slide rail 14, and a drive cylinder 15.

[0022] like Figure 3 As shown, the tightening mechanism 11 includes a first base 111, a tightening shaft 112, a tightening sleeve 113, a push plate 114 and an elastic member 115. The first base 111 is a semi-open box-type structure, and the tightening shaft 112 is installed through one side wall, and the elastic member 115 is installed on the outer surface of the side wall. The tightening shaft 112 can be electric or pneumatic. A positioning shaft 1121 is arranged on the power output end of the tightening shaft 112. A mounting hole is arranged at one end of the tightening sleeve 113, and the mounting hole is used to be mounted on the positioning shaft 1121. A working hole is arranged at the other end of the tightening sleeve 113, which is used to be mounted on the fasteners of the landing gear to tighten the fasteners. As shown Figure 4 As shown, a flange 1131 is provided on the outer circumferential surface of one end of the tightening sleeve 113 where the mounting hole is provided. The tightening sleeve 113 is radially fixed to the positioning shaft 1121 (e.g., a keyway or key can be used for matching), and axially slides (the tightening sleeve 113 is withdrawn through the push plate 114 to be installed in place).

[0023] like Figure 3As shown, the elastic member 115 includes a plurality of telescopic rods 1151 and a plurality of springs 1152. The plurality of springs 1152 are arranged around the push plate 114. In the vertical direction of the push plate 114, a telescopic rod 1151 is arranged between every two springs 1152. The elastic member 115 is connected between the first base 111 and the push plate 114. The push plate 114 is provided with a through hole for the tightening sleeve 113 to pass through. The inner diameter of the through hole is smaller than the outer diameter of the flange 1131. The elastic member 115 always outputs thrust so that the side wall of the through hole formed by the push plate 114 is always in contact with the flange 1131 of the tightening sleeve 113 (such as Figure 4 As shown). The extension stroke of the elastic member 115 is based on the fact that the tightening sleeve 113 is completely inserted into the correct position of the fastener, so as to better judge whether the tightening sleeve 113 is in place.

[0024] like Figure 2 As shown, the column 13 is placed beside the adjustment device 2. The top of the column 13 is provided with a second base 12 extending in the X direction. The upper end of the second base 12 is provided with a slide rail extending in the X direction. The first base 111 is adapted to the slide rail 14, and a driving cylinder 15 is connected between the second base 12 and the first base 111, and the driving cylinder 15 is a pneumatic cylinder or an electric cylinder.

[0025] The tightening sleeve 113 rotates according to the type of the fastener, and a storage station for tightening sleeves 113 of various types is arranged beside the column 13 .

[0026] like Figure 1 , Figure 5 As shown, the adjustment device 2 includes a third base 25, a fourth base 26 raised and lowered on one side of the third base 25 in the Y direction by a lifting mechanism 21, and a clamping mechanism 24 rotated on the fourth base 26 by a rotating mechanism 23. The third base 25 is provided with a side of the column 13.

[0027] A frame 22 is disposed on the top of the third base 25. The lifting mechanism 21 is a cylinder or an electric cylinder, which is installed on the frame 22. The telescopic rod of the lifting mechanism 21 passes through the frame 22 downward and is connected to the fourth base 26.

[0028] The rotating mechanism 23 may be a slewing bearing, which is respectively mounted on the fourth base 26 and the base plate 241 of the clamping mechanism 24. The clamping mechanism 24 is driven by a motor to rotate to achieve the first position and the second position, and the motor is used to achieve self-locking of the rotation position.

[0029] The clamping mechanism 24 includes a base plate 241, a first driving mechanism 242 and a first clamping jaw 243. The first driving mechanism 242 is installed on a side surface of the base plate 241 away from the rotating mechanism 23. The first driving mechanism 242 may include a guide rail, a screw rod with positive and negative spirals and a driving motor. Two first clamping jaws 243 are mounted on the screw rod with positive and negative spirals. One end of the first clamping jaw 243 is connected to the guide rail, and the other end is designed with an arc structure. The driving motor is connected to the screw rod. The driving motor is installed on the base plate 241, and the screw rod is rotatably arranged on the base plate 241. The screw rod is driven by the driving motor to rotate positively and negatively, so that the two first clamping jaws 243 on the screw rod are opened and closed, and a clamping cavity 27 for clamping the landing gear is formed between the two first clamping jaws 243.

[0030] In order to adapt to the clamping of a longer landing gear, the clamping mechanism 24 further includes a second driving mechanism 244, a second clamping claw 245 and a connecting seat 246. The connecting seat 246 is L-shaped with a corner, and the connecting seat 246 is connected to one end of the base plate 241. Two connecting seats 246 are arranged on the base plate 241 at intervals. The horizontal end of the L-shape of each connecting seat 246 is connected to a second clamping claw 245 through a second driving mechanism 244 (a cylinder or an electric cylinder can be selected). The clamping cavity 27 is formed between the two second clamping claws 245. The opening and closing directions of the two second clamping claws 245 are consistent with the opening and closing directions of the two first clamping claws 243.

[0031] The two first clamping jaws 243 are driven to open and close simultaneously by the same first driving mechanism 242 to achieve centering clamping. The two second clamping jaws 245 are opened and closed by their respective second driving mechanisms 244 to adapt to the clamping of parts with variable cross-sections, so as to ensure the effective clamping of the long landing gear by tightening the fasteners.

[0032] If the above-mentioned driving mechanisms adopt cylinders, they are controlled by solenoid valves.

[0033] The present invention also provides a method for tightening a pre-fixed part (fastener) on a landing gear, comprising the following steps: S1, driving the landing gear rotation positioning tightening device back to the initial position: the tightening mechanism 11 of the docking device 1 is retracted to the side away from the adjustment device 2, and the clamping cavity 27 on the adjustment device 2 is placed in the second position and is in an open state. In this embodiment, the second position is when the clamping mechanism 24 is in a vertical state (such as Figure 1 As shown), the clamping mechanism 24 is lowered by the lifting mechanism 21 to facilitate installation by manually lifting the landing gear.

[0034] S2, according to the type of fastener, select the corresponding tightening sleeve and set the tightening torque. Pass the tightening sleeve 113 through the through hole on the push plate 114 and sleeve it on the positioning shaft 1121 of the tightening shaft 112, and make the end face of the flange 1131 of the tightening sleeve 113 contact with the push plate 114; clamp the landing gear in the clamping cavity 27 and close the clamping cavity 27 to limit the landing gear.

[0035] S3, start the lifting mechanism 21 to lift the clamping mechanism 24 and the landing gear thereon. Start the rotating mechanism 23 to drive the clamping mechanism 24 and the landing gear thereon to rotate 90° to place them in the first position. At this time, the adjusting device 2 can send a signal to the control center through the position sensor thereon, and the control center sends a command to the docking device 1.

[0036] S3, the docking device 1 receives the instruction to start the solenoid valve reversal, so that the drive cylinder 15 extends, pushes the tightening mechanism 11 to move closer to the adjustment device 2 in the X direction, and drives the tightening sleeve 113 to extend into the landing gear and contact the pre-fixed parts (fasteners). In order to ensure the torque transmission and position alignment of the sleeve 113, a key is set on the fastener, and the inner ring of the tightening sleeve 113 is set in the slot adapted by the key. If the slot is not mounted on the key, the other surfaces of the fastener push the tightening sleeve 113 in the opposite direction, forcing the push plate 114 to be subjected to the opposite force to its thrust, and the elastic member 115 is compressed, then the tightening shaft 112 of the tightening mechanism 11 is started to rotate at the first speed, so that the tightening sleeve 113 rotates slowly to adjust the position. Until the slot on the tightening sleeve 113 is completely inserted into the key of the fastener, the compressed force is released, the elastic member 115 extends, and the thrust of the push plate 114 is completely released, so that the tightening sleeve 113 is completely inserted into the pre-fixed part of the landing gear. Whether the push plate 114 is in a compressed or extended state can be sensed by a sensor.

[0037] S4, start the tightening mechanism 11 to rotate rapidly at a second speed, drive the tightening sleeve 113 to tighten the pre-fixed parts, and reach a preset torque value (combined with sound and light alarm prompts). The first speed is lower than the second speed.

[0038] S5, after completion, first return the tightening mechanism 11 to the initial position, then return the clamping mechanism 24 to the initial position, and remove the landing gear.

[0039] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A landing gear rotation positioning tightening device, characterized in that: The invention comprises a docking device (1) and an adjustment device (2) arranged beside the docking device (1), wherein the docking device (1) comprises a second base (12) and a tightening mechanism (11) displaced along the second base (12) on an X-axis, wherein the tightening mechanism (11) comprises a first base (111), a tightening shaft (112) and a tightening sleeve (113), wherein the first base (111) is slidably connected to the second base (12), the tightening shaft (112) is mounted on the first base (111), and the tightening sleeve (113) is provided. The power output end of the tightening shaft (112) is sleeved with the tightening sleeve (113), and the first base (111) is also connected to a push plate (114) for axially pushing the tightening sleeve (113); the adjustment device (2) is provided with an openable and closable clamping cavity (27), and the clamping cavity (27) rotates to achieve a first position and a second position. In the first position, the clamping cavity (27) corresponds to the position of the tightening sleeve (113), and in the second position, the clamping cavity (27) deviates from the tightening sleeve (113).

2. The landing gear rotation positioning tightening device according to claim 1, characterized in that: The push plate (114) and the first base (111) are connected via an elastic member (115), and the elastic member (115) always outputs a thrust force so that the push plate (114) and the tightening sleeve (113) are in constant contact.

3. The landing gear rotation positioning tightening device according to claim 2, characterized in that: The elastic member (115) comprises a plurality of telescopic rods (1151) and a plurality of springs (1152); the plurality of springs (1152) are arranged around the push plate (114); and one telescopic rod (1151) is arranged between every two springs (1152) in the vertical direction and / or the horizontal direction of the push plate (114).

4. The landing gear rotation positioning tightening device according to claim 1, characterized in that: The tightening sleeve (113) is radially fixed to the power output end of the tightening shaft (112) and axially slides.

5. The landing gear rotation positioning tightening device according to claim 1, characterized in that: One end of the tightening sleeve (113) is provided with a flange (1131) adapted to the push plate (114).

6. The landing gear rotation positioning tightening device according to any one of claims 1 to 5, characterized in that: The docking device (1) further comprises a column (13), a second base (12) arranged on the top of the column (13), and a slide rail (14) arranged on the upper end of the second base (12) and extending along the X direction, the first base (111) being adapted to fit on the slide rail (14), a driving cylinder (15) being connected between the second base (12) and the first base (111), and the column (13) being placed beside the adjustment device (2).

7. The landing gear rotation positioning tightening device according to claim 1, characterized in that: The adjustment device (2) comprises a third base (25), a fourth base (26) which is raised and lowered on one side of the third base (25) in the Y direction by a lifting mechanism (21), and a clamping mechanism (24) which is arranged on the fourth base (26) and is rotated by a rotating mechanism (23), wherein the clamping cavity (27) is arranged on the clamping mechanism (24), and the third base (25) is placed beside the docking device (1).

8. The landing gear rotation positioning tightening device according to claim 7, characterized in that: The clamping mechanism (24) comprises a base plate (241) mounted on the rotating mechanism (23), a first driving mechanism (242) connected to the base plate (241), and two first clamping jaws (243) connected to the first driving mechanism (242), wherein the first driving mechanism (242) is used to drive the two first clamping jaws (243) thereon to open and close, and the clamping cavity (27) is formed between the two first clamping jaws (243).

9. The landing gear rotation positioning tightening device according to claim 8, characterized in that: The clamping mechanism (24) further comprises a connection seat (246) connected to one end of the base plate (241), two connection seats (246) are arranged on the base plate (241) at intervals, and the end of each connection seat (246) is connected to a second clamping jaw (245) via a second driving mechanism (244), and the clamping cavity (27) is formed between the two second clamping jaws (245), and the opening and closing direction of the two second clamping jaws (245) is consistent with the opening and closing direction of the two first clamping jaws (243).

10. A method for tightening pre-fixed parts on a landing gear, using the landing gear rotation positioning tightening device according to any one of claims 1 to 9, characterized in that: include: The landing gear rotation positioning tightening device is driven to return to the initial position: the tightening mechanism (11) of the docking device (1) is retracted to a side away from the adjustment device (2), and the clamping cavity (27) on the adjustment device (2) is placed in a second position and is in an open state; The tightening sleeve (113) is sleeved on the power output end of the tightening shaft (112), and the end surface of the tightening sleeve (113) is in contact with the push plate (114); the landing gear is clamped in the clamping cavity (27) and the clamping cavity (27) is closed to limit the landing gear; Starting the adjustment device (2) to drive the clamping chamber (27) and the landing gear thereon to rotate until they reach the first position and stop; The docking device (1) is started to drive the tightening mechanism (11) to move in the X direction, so that the tightening sleeve (113) extends into the landing gear and contacts the pre-fixed part; if the tightening sleeve (113) forces the push plate (114) to be subjected to a force opposite to its thrust, the tightening mechanism (11) is started to rotate at a first speed until the thrust of the push plate (114) is completely released, so that the tightening sleeve (113) is completely inserted into the pre-fixed part of the landing gear; The tightening mechanism (11) is started to rotate at a second speed, driving the tightening sleeve (113) to tighten the pre-fixed parts; after completion, the tightening mechanism (11) is first returned to the initial position, and then the adjustment device (2) is returned to the initial position, and the landing gear is removed; the first speed is lower than the second speed.

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