A disassembly device for an aviation propeller plug bushing

Abstract

The present invention discloses a disassembly device for an aviation propeller plug bushing, comprising a positioning shaft and a pull rod. The positioning shaft is assembled onto the plug bushing from the bottom of the plug bushing so that the outer surfaces of the positioning shaft and the inner wall of the plug bushing are completely in contact; a washer is assembled from the top of the positioning shaft, a nut is assembled onto the positioning shaft and tightened so that the positioning shaft and the plug bushing become one; then the pull rod is assembled from the cuff of the propeller shell, a nut is assembled on the top of the pull rod and tightened, a pin puller drives the pull rod to move upward, and the tapered surface of the pull rod moves upward to increase the outer diameter of the positioning shaft. When the upward impact force is greater than the bonding force between the plug bushing and the propeller shell, the plug bushing loosens and moves upward to separate from the propeller shell. The disassembly device is positioned with the inner hole of the plug bushing, and the bottom of the plug bushing is the force-bearing surface. The plug bushing is disassembled intactly in cooperation with the pin puller, eliminating the rotation of the plug bushing, preventing scratches on the propeller shell, and maintaining no damage to the plug bushing parts, thereby improving the utilization rate of the plug bushing.

Description

Technical Field

[0001] The invention relates to the technical field of aviation propeller repair, in particular to a disassembly device for an aviation propeller plug bushing. Background Art

[0002] When a propeller is returned for repair or troubleshooting, all parts, including the plug bushing, that are assembled on the propeller housing must be disassembled to perform flaw detection, measurement, and other inspections. The plug bushing and propeller housing are assembled together, and the propeller housing's bosses and steps restrict the plug bushing's rotation and downward movement.

[0003] The plug bushing is adhered to the hole in the propeller housing and cannot be removed directly. Since the exposed part of the plug bushing is a special-shaped structure, it cannot be directly removed by knocking it out with a copper rod. Therefore, an M24×1.0 tap is used to tap the plug bushing 6-8 times and then the tap is knocked to move the plug bushing and separate it from the propeller housing.

[0004] This disassembly method not only damages the inner bore of the plug bushing, rendering the part 100% scrapped after disassembly, but also frequently causes the tap to cause the plug bushing to rotate during tapping. The propeller housing is aluminum, while the plug bushing is steel. The plug bushing is much harder than the propeller housing, and rotation of the plug bushing can scratch the housing boss.

[0005] Therefore, it is necessary to design a disassembly device for an aviation propeller plug bushing to disassemble the plug bushing. Summary of the Invention

[0006] The purpose of the present invention is to provide a disassembly device for an aviation propeller plug bushing to solve the problems existing in the above-mentioned prior art, which can not only avoid scratches on the propeller shell, but also ensure the reuse of the plug bushing parts.

[0007] To achieve the above object, the present invention provides the following solution: The present invention provides a disassembly device for an aviation propeller plug bushing, comprising:

[0008] The positioning shaft is hollow and is divided into a connecting section 1, a transition shoulder 1 and an expansion section 1 from top to bottom. The expansion section 1 contacts the inner wall of the plug bushing. A washer is sleeved on the transition shoulder. The washer is located outside the end surface of the plug bushing and contacts the end surface of the plug bushing. A nut 1 is threadedly connected to the connecting section 1, and the nut 1 is used to connect and tighten the positioning shaft and the plug bushing into one piece. An inner tapered hole is provided on the inner wall surface of the bottom of the expansion section 1.

[0009] The pull rod, which is passed through the inner cavity of the positioning shaft, is divided into connecting section 2 and expansion section 2 from top to bottom. The bottom of the expansion section 2 is a frustum structure, and the bottom frustum of the expansion section 2 cooperates with the inner tapered hole of the expansion section 1; the connecting section 2 of the pull rod extends out of the top of the connecting section 1 of the positioning shaft, and the outer side of the extended end of the connecting section 2 is equipped with a nut 2, the connecting section 2 is provided with an internal thread, and the pin puller is fastened to the internal thread at the connecting section 2.

[0010] Preferably, the length of the connecting section 1 is 35 mm, the outer periphery of the connecting section 1 is provided with an external thread, and the nut 1 is threadedly connected to the external thread of the connecting section 1.

[0011] Preferably, the top surface of the transition shoulder is flush with the end surface of the plug bushing, and the gasket is placed on the transition shoulder and outside the end surface of the plug bushing.

[0012] Preferably, the outer side of the bottom of the first expansion section of the positioning shaft is a special-shaped connecting portion with a notch.

[0013] Preferably, the length of the second connecting section is 45 mm, and the height of the internal thread provided in the second connecting section is 20 mm.

[0014] Preferably, a second transition shoulder is provided between the second connecting section and the second expanding section, and the second nut is assembled on the upper side of the second transition shoulder.

[0015] Preferably, the diameter of the second nut is smaller than the diameter of the first nut.

[0016] Compared with the prior art, the present invention has achieved the following beneficial technical effects:

[0017] The disassembly device of the aviation propeller plug bushing in the present invention includes a positioning shaft and a pull rod. The positioning shaft is assembled onto the plug bushing from the bottom of the plug bushing so that the outer surfaces of the positioning shaft and the inner wall of the plug bushing are completely fitted; a washer is assembled from the top of the positioning shaft (above the propeller shell), a nut is assembled onto the positioning shaft, and is tightened so that the positioning shaft and the plug bushing become one; then the pull rod is assembled from the sleeve of the propeller shell, a nut is assembled on the top of the pull rod and is tightened, a pin puller drives the pull rod to move upward, and the tapered surface of the pull rod moves upward to increase the outer diameter of the positioning shaft. When the upward impact force is greater than the bonding force between the plug bushing and the propeller shell, the plug bushing loosens and moves upward and separates from the propeller shell. The disassembly device is positioned with the inner hole of the plug bushing, and the bottom of the plug bushing is the force-bearing surface. It cooperates with the pin puller to disassemble the plug bushing intactly, eliminating the rotation of the plug bushing, preventing scratches on the propeller shell, and not damaging the plug bushing parts, thereby improving the utilization rate of the plug bushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a schematic diagram of the overall structure of the disassembly device of the aviation propeller plug bushing;

[0020] Figure 2 It is a structural diagram of the positioning axis;

[0021] Figure 3 It is a top view of the positioning axis;

[0022] Figure 4 It is a structural diagram of the pull rod;

[0023] Among them, 1. Pull rod; 2. Washer; 3. Nut 1; 4. Positioning shaft; 5. Nut 2; 6. Plug bushing; 7. Paddle housing. DETAILED DESCRIPTION

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

[0025] The purpose of the present invention is to provide a disassembly device for an aviation propeller plug bushing to solve the problems existing in the above-mentioned prior art, which can not only avoid scratches on the propeller shell, but also ensure the reuse of the plug bushing parts.

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figures 1-4 As shown, the present invention provides a disassembly device for an aviation propeller plug bushing, comprising

[0028] The positioning shaft 4 is a hollow positioning shaft 4 which is divided into a connecting section 1, a transition shoulder 1 and an expansion section 1 from top to bottom. The expansion section 1 contacts the inner wall of the plug bushing 6. A washer 2 is sleeved on the transition shoulder. The washer 2 is located outside the end face of the plug bushing 6 and contacts the end face of the plug bushing 6. A nut 1 3 is threadedly connected to the connecting section 1. The nut 1 3 is used to connect and tighten the positioning shaft 4 and the plug bushing 6 into one piece. An inner tapered hole is provided on the inner wall surface of the bottom of the expansion section 1.

[0029] The pull rod 1, which passes through the inner cavity of the positioning shaft 4, is divided into a connecting section 2 and an expansion section 2 from top to bottom. The bottom of the expansion section 2 is a frustum structure, and the frustum of the bottom of the expansion section 2 cooperates with the inner tapered hole of the expansion section 1; the connecting section 2 of the pull rod 1 extends out of the top of the connecting section 1 of the positioning shaft 4, and a nut 2 5 is assembled on the outside of the extended end of the connecting section 2. The connecting section 2 is provided with an internal thread, and the pin puller is fastened to the internal thread at the connecting section 2.

[0030] In one embodiment, the length of the connecting section 1 is 35 mm, the outer periphery of the connecting section 1 is provided with an external thread, a nut 1 3 of M16 specification is threadedly connected to the external thread of the connecting section 1, the top surface of the transition shoulder 1 is flush with the end face of the plug bushing 6, and the washer 2 is placed at a transition shoulder and located outside the end face of the plug bushing 6. The length of the expansion section 1 is 26mm±0.1mm, and the outer diameter is 17.5mm±0.02mm. The expansion section 1 and the inner hole of the plug bushing 6 are positioned together. The inner wall surface of the bottom of the expansion section 1 is provided with an inner tapered hole with a taper of 8°. The outer side of the bottom of the expansion section 1 of the positioning shaft 4 is a special-shaped connection part with a notch. The inner tapered hole is located on the inner wall of the special-shaped connection part. The special-shaped connection part with a notch and the bottom surface of the plug bushing 6 are positioned together, which helps to better combine the positioning shaft 4 with the bottom of the plug bushing 6 during the expansion process of the expansion section 1, increase the contact area and friction between the positioning shaft 4 and the inner wall of the plug bushing 6, and facilitate the pull rod 1 to drive the positioning shaft 4 to pull the plug bushing 6 away from the propeller shell 7 intact, realizing the disassembly operation of the plug bushing 6 and the propeller shell 7. In addition, the positioning shaft 4 and the pull rod 1 adopt a conical surface fit, which can make the two fit more closely and prevent the pull rod 1 and the positioning shaft 4 from falling off during operation.

[0031] In one embodiment, the length of the second connecting section is 45 mm. The second connecting section is matched with the second nut 5 of M10 specification. The outer diameter of the second nut 5 is larger than the inner diameter of the positioning shaft 4. The pull rod 1 is connected to the positioning shaft 4 and tightened by the second nut 5. The height of the internal thread provided in the second connecting section is 20 mm. The pin puller is connected to the second connecting section via a thread. A second transition shoulder is provided between the second connecting section and the second expansion section. The second nut 5 is assembled on the upper side of the second transition shoulder. The width of the second transition shoulder is 8 mm, which facilitates tightening the second nut 5 with a wrench. The bottom of the second expansion section is a truncated cone with a height of 15 mm and a taper of 8°. The cone is used to expand the positioning shaft 4 so that it fits into the inner hole of the plug bushing 6.

[0032] The disassembly steps of the aviation propeller plug bushing 6 are as follows:

[0033] 1) First, assemble the positioning shaft 4 onto the plug bushing 6 from the bottom of the plug bushing 6, so that the outer surfaces of the positioning shaft 4 are completely in contact with the inner wall and bottom surface of the plug bushing 6.

[0034] 2) Assemble the washer 2 from above the positioning shaft 4 (above the propeller housing 7) and check that the washer 2 is in contact with the end face of the plug bushing 6.

[0035] 3) Assemble the M16 nut 3 onto the positioning shaft 4 and tighten it, so that the positioning shaft 4 and the plug bushing 6 become one.

[0036] 4) Assemble the pull rod 1 from the sleeve of the paddle housing 7, and tighten the M10 nut 5. By moving the tapered surface of the pull rod 1 upward, the outer diameter of the positioning shaft 4 is increased, increasing the contact area between the shaft boss and the plug bushing 6.

[0037] 5) Securely connect the pin puller to the M6 threaded hole of pull rod 1.

[0038] 6) Move the counterweight on the pin puller to move the pin puller and the pull rod 1 upward. When the upward impact force is greater than the bonding force between the plug bushing 6 and the paddle housing 7, the plug bushing 6 loosens, moves upward, and separates from the paddle housing 7.

[0039] The disassembly device for the aviation propeller plug bushing 6 of the present invention prevents the plug bushing 6 from rotating during disassembly, thereby avoiding scratching the boss of the propeller housing 7. Because the end faces of the pull rod 1 and the plug bushing 6 conform to each other, the plug bushing 6 is evenly stressed and does not deform. It can continue to be used after disassembly, thereby improving part utilization and reducing maintenance costs.

[0040] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all perspectives, the embodiments should be regarded as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description. It is intended that all changes that fall within the meaning and range of equivalents of the claims be included in the present invention, and any reference signs in the claims should not be construed as limiting the claims to which they relate.

[0041] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A disassembly device for an aviation propeller plug bushing, characterized by: include The positioning shaft is hollow and is divided into a connecting section 1, a transition shoulder 1 and an expansion section 1 from top to bottom. The expansion section 1 contacts the inner wall of the plug bushing. A washer is sleeved on the transition shoulder. The washer is located outside the end surface of the plug bushing and contacts the end surface of the plug bushing. A nut 1 is threadedly connected to the connecting section 1, and the nut 1 is used to connect and tighten the positioning shaft and the plug bushing into one piece. An inner tapered hole is provided on the inner wall surface of the bottom of the expansion section 1. The pull rod, which is passed through the inner cavity of the positioning shaft, is divided into a connecting section 2 and an expanded section 2 from top to bottom. The bottom of the expanded section 2 is a truncated cone structure. The truncated cone at the bottom of the expanded section 2 cooperates with the inner tapered hole of the expanded section 1. The connecting section 2 of the pull rod extends out of the top of the connecting section 1 of the positioning shaft, and a nut 2 is assembled on the outer side of the extended end of the connecting section 2. The connecting section 2 is provided with an internal thread, and the pin puller is fastened to the internal thread at the connecting section 2. The top surface of the transition shoulder 1 is flush with the end surface of the plug bushing, and the gasket is placed on the transition shoulder and outside the end surface of the plug bushing; the outside of the bottom of the expansion section 1 of the positioning shaft is a special-shaped connecting portion with a notch.

2. The disassembly device for the aviation propeller plug bushing according to claim 1, characterized in that: The length of the connecting section 1 is 35 mm, and an external thread is provided on the outer periphery of the connecting section 1. The nut 1 is threadedly connected to the external thread of the connecting section 1.

3. The disassembly device for the aviation propeller plug bushing according to claim 1, characterized in that: The length of the second connecting section is 45 mm, and the height of the internal thread provided in the second connecting section is 20 mm.

4. The disassembly device for an aviation propeller plug bushing according to claim 1, characterized in that: A second transition shoulder is provided between the second connecting section and the second expanding section, and the second nut is assembled on the upper side of the second transition shoulder.

5. The disassembly device for an aviation propeller plug bushing according to claim 1, characterized in that: The diameter of the second nut is smaller than the diameter of the first nut.

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