A double-lip seal ring dismounting tool for helicopter engines

Abstract

The utility model discloses a helicopter engine double-lip sealing ring dismounting tool belongs to mechanical frock technical field. The tool includes outer support frame, stretching mechanism and inner clamping mechanism. Outer support frame includes crossbeam and two support rods on the same side of crossbeam, stretching mechanism includes the guide cylinder of fixed in the middle part of crossbeam and with the same length direction of support rod, the special-shaped section thread cylinder of special-shaped section thread cylinder sliding fit, the first nut of special-shaped section thread cylinder screw thread cooperation, the first nut is pressed in one end of guide cylinder and sliding fit, and the inner wall of guide cylinder adapts special-shaped section thread cylinder, and the clamping claw mechanism of fixed in one end of special-shaped section thread cylinder of inner clamping mechanism, the clamping claw contraction and expansion adjusting mechanism of being arranged between special-shaped section thread cylinder and clamping claw mechanism. The tool can adjust the contraction and expansion of clamping claw, can not only avoid the damage of sealing surface of sealing ring when being placed into the shaft hole, but also can adjust the radial size of clamping claw clamping sealing ring, can avoid the dismounting problem caused by improper clamping position.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical tooling technology, specifically relating to a tool for disassembling the double-lip seal ring of a helicopter engine. Background Technology

[0002] In recent years, the emergency response needs of health and medical departments, fire departments, and other units have been increasing, leading to the wider application of the EN480 aircraft in these fields due to its unique advantages. As the operating hours of this type of aircraft continue to accumulate, the operational support work has also increased. This has resulted in not only a rise in aircraft failure rates but also an increase in the number of time-limited parts requiring replacement, while placing higher demands on maintenance timeliness.

[0003] During the maintenance of the EN480 aircraft engine, the double lip seal of the engine overspeed clutch is a critical component. When the double lip seal fails, reaches a certain service life, or is damaged in other related components and needs to be removed, specific tools must be used to complete the disassembly.

[0004] Existing disassembly tools have numerous design and operational problems. They typically employ flexible claws inserted into the sealing ring hole, relying on hooks to hold the end of the sealing ring. An external support member is fitted onto the end of the device, and a screw that slides into the support member connects to the flexible claws. By rotating a nut that engages with the screw, the support member is compressed, causing displacement of the screw relative to the support member, thereby allowing the flexible claws to remove the sealing ring.

[0005] However, this type of disassembly tool has significant drawbacks. Firstly, the flexible gripper has poor adaptability to the size of the sealing ring. Since different batches and models of engine overspeed clutch double-lip sealing rings may have slight size variations, the existing flexible gripper cannot flexibly adapt to these changes. This can lead to inaccurate gripping of the sealing ring during actual operation, affecting the smooth progress of the disassembly. Secondly, the sealing surface of the sealing ring is easily damaged during the process of removing it using the flexible gripper. Once the sealing surface is damaged, even if the sealing ring is subsequently reinstalled, it is difficult to guarantee its proper sealing performance. This will directly affect the engine's performance and safety, and may even lead to engine failure, endangering flight safety.

[0006] In summary, existing tools for disassembling the double-lip seal of the overspeed clutch of the EN480 aircraft engine are severely inadequate in terms of adaptability to seal size and protection of the seal. There is an urgent need to develop a new type of disassembly tool to meet the growing aircraft maintenance needs, improve maintenance efficiency and quality, and ensure the safe operation of aircraft. Utility Model Content

[0007] The purpose of this invention is to provide a tool for disassembling double-lip seals for helicopter engines. This addresses the technical problems of existing disassembly tools having poor dimensional adaptability to double-lip seals and being prone to damaging the sealing surface.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A tool for removing double-lip seals from a helicopter engine, comprising: - External support frame, which includes a crossbeam and two support rods located on the same side of the crossbeam; - A tensioning mechanism, comprising a guide cylinder fixed in the middle of a crossbeam and in the same direction as the length of a support rod, a threaded cylinder with an irregular cross-section that slides with the guide cylinder, and a first nut that is threaded with the threaded cylinder with the irregular cross-section; the first nut presses against one end of the guide cylinder and slides with it, and the inner wall of the guide cylinder is adapted to the threaded cylinder with an irregular cross-section. - The internal locking mechanism includes a claw mechanism fixed to one end of the irregular cross-section threaded cylinder and a claw expansion and contraction adjustment mechanism located between the irregular cross-section threaded cylinder and the claw mechanism.

[0009] Furthermore, the outer contour of the irregular cross-section threaded cylinder is oval or semi-circular.

[0010] Furthermore, the claw retraction and expansion adjustment mechanism includes: - Adjusting screw, which is located inside the irregular cross-section threaded cylinder and is slidably fitted, and its two ends extend to the outside of the irregular cross-section threaded cylinder; - The second nut, which is threadedly engaged with the adjusting screw and located on the outside of the other end of the irregular cross-section threaded cylinder, presses against the end of the irregular cross-section threaded cylinder and slides in fit; - A magnetic adjustment block, comprising an iron shell that is hemispherical in shape and a magnet block disposed inside the iron shell, the spherical surface of which is fixedly connected to one end of an adjustment screw.

[0011] Furthermore, the gripper mechanism includes: - Connecting cylinder, one end of which is fixed to the end of the irregular cross-section threaded cylinder and arranged coaxially, with its outer diameter being smaller than the diameter of the magnetic adjusting block; - A chuck, which has multiple chucks and is hinged to the outer circumferential wall of the connecting cylinder, includes an iron rod section and a hook section at the free end of the iron rod section. The iron rod section of the chuck is magnetically attracted to the magnetic adjustment block.

[0012] Furthermore, the hook section of the claw is provided with a rubber coating.

[0013] Furthermore, a rubber gasket is provided at the free end of the support rod.

[0014] Compared with the prior art, the beneficial effects of this utility model are: When using this tool, the expansion and contraction of the jaws can be adjusted. This can prevent damage to the sealing surface of the seal ring during insertion into the shaft hole, and also adjust the radial size of the actual gripping of the seal ring by the jaws, avoiding damage to the seal ring or ineffective gripping caused by improper gripping position of the jaws.

[0015] The expansion and contraction of the chucks are adjusted by rotating the second nut located outside the irregular cross-section threaded cylinder. The operating position is located outside the shaft hole, which increases the convenience of the adjustment operation.

[0016] The overall structural design utilizes a special component—a threaded cylinder with an irregular cross-section—simplifying the overall structure. Simultaneously, the expansion and retraction of the chucks are adjusted and limited using a hemispherical magnetic adjusting block, eliminating the need for a complex linkage structure and further simplifying the overall design. This facilitates manufacturing and widespread application. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a top view of the crossbeam and guide tube in this utility model. Figure 3 This is a schematic diagram of the port of the irregular cross-section threaded cylinder in this utility model and a schematic diagram after it is engaged with the first nut.

[0018] Among them, 1-crossbeam; 2-support rod; 3-guide cylinder; 4-threaded cylinder with special cross section; 5-first nut; 6-adjusting screw; 7-second nut; 8-magnetic adjusting block; 9-connecting cylinder; 10-claw. Detailed Implementation

[0019] The preferred embodiments of this utility model will be described below with reference to the accompanying drawings.

[0020] like Figures 1 to 3 As shown, a tool for removing the double-lip seal ring of a helicopter engine is disclosed. The tool mainly includes an outer support frame, a tensioning mechanism, and an inner locking mechanism.

[0021] The external support frame includes a crossbeam 1 and two support rods 2 located on the same side of the crossbeam 1, providing a stable external support structure for the entire tool. The span of the support rods 2 corresponds to the end face that can be supported at the end of the equipment. This design allows the tool to securely engage with engine-related components during operation, ensuring the stability of the disassembly work.

[0022] The tensioning mechanism includes a guide cylinder 3, a non-circular cross-section threaded cylinder 4, and a first nut 5. The guide cylinder 3 is fixed to the middle of the crossbeam 1 and runs parallel to the length of the support rod 2. The non-circular cross-section threaded cylinder 4 has an oval or semi-circular outer profile. The inner wall of the guide cylinder 3 is fitted with the non-circular cross-section threaded cylinder 4, allowing for sliding contact between the non-circular cross-section threaded cylinder 4 and the guide cylinder 3. Based on the non-circular cross-section, circumferential stopping relative to the guide cylinder 3 is achieved. The first nut 5 is threadedly engaged with the non-circular cross-section threaded cylinder 4, pressing against one end of the guide cylinder 3 and allowing for sliding contact. By rotating the first nut 5, the axial displacement of the non-circular cross-section threaded cylinder 4 within the guide cylinder 3 can be controlled.

[0023] The internal locking mechanism includes a claw mechanism fixed to one end of the irregular cross-section threaded cylinder 4 and a claw expansion and contraction adjustment mechanism located between the irregular cross-section threaded cylinder 4 and the claw mechanism.

[0024] The chuck expansion / contraction adjustment mechanism includes an adjusting screw 6, a second nut 7, and a magnetic adjusting block 8. The adjusting screw 6 is located inside and slidably engages with the irregularly shaped threaded cylinder 4, with both ends extending to the outside of the cylinder 4. The second nut 7 is threadedly engaged with the adjusting screw 6 and located on the outside of the other end of the irregularly shaped threaded cylinder 4, pressing against the end of the cylinder 4 and slidably engaging. The magnetic adjusting block 8 is hemispherical in shape, consisting of an iron outer shell and a magnet block inside the iron shell, with its spherical surface fixedly connected to one end of the adjusting screw 6. The magnetic adjusting block 8 magnetically engages with the chuck 10, fixing the adjusting screw 6 circumferentially. By rotating the second nut 7, the axial movement of the adjusting screw 6 can be controlled, thereby driving the magnetic adjusting block 8 to move, achieving the expansion / contraction adjustment of the chuck mechanism.

[0025] The jaw mechanism includes a connecting cylinder 9 and multiple jaws 10. One end of the connecting cylinder 9 is fixed to the end of the irregularly shaped threaded cylinder 4 and is coaxially arranged; its outer diameter is smaller than the diameter of the magnetic adjusting block 8. Multiple jaws 10 are hinged to the circumferential outer wall of the connecting cylinder 9. Each jaw 10 includes an iron rod section and a hook section at the free end of the iron rod section. The iron rod section of the jaw 10 magnetically engages with the magnetic adjusting block 8. This design allows the jaws 10 to flexibly adjust their opening and closing degree according to the position changes of the magnetic adjusting block 8, better adapting to different sizes of double-lip seals and specific radial locking positions. Furthermore, the hook section of the jaw 10 has a rubber coating layer at its end, which provides cushioning and protection when gripping and removing the seal.

[0026] In addition, the free end of the support rod 2 is equipped with a rubber pad. This detail design can increase the friction and stability when the support rod 2 contacts the engine parts, prevent the tool from slipping during disassembly, and also avoid damage to the support part.

[0027] The working process and principle of this utility model are as follows: In application: Insert the jaws 10 into the shaft hole, with the insertion depth corresponding to the sealing ring. Rotate the second nut 7. Because the jaws 10 are magnetically attracted by the magnetic adjusting block 8, the rotation of the adjusting screw 6 is suppressed. This causes the adjusting screw 6 to rotate outward relative to the irregular cross-section threaded cylinder 4 when the second nut 7 rotates. The magnetic adjusting block 8 squeezes the jaws 10, thereby causing multiple jaws 10 to expand outward around their hinge ends. The outward expansion size is adjustable. When the second nut 7 can drive the adjusting screw 6 to rotate, the jaws 10 expand to their limit position without rigidly damaging the inner wall of the shaft hole. Rotate the first nut 5 with a wrench or other tools. The first nut 5 moves on the irregular cross-section threaded cylinder 4 and presses against the crossbeam 1 until the support rod 2 presses against the end face of the equipment. After the support rod 2 presses against the end face, it can correct the jaws 10, so that multiple jaws 10 can effectively hold the sealing ring. Continue rotating the first nut 5. The irregularly shaped threaded cylinder 4 drives the jaws 10 to move outward, ultimately pulling out the sealing ring and removing it. Throughout the process, the sealing surface of the sealing ring is protected from damage. The jaws 10 can be adjusted to hold the ring in an effective removal position, such as avoiding the inner wall area of ​​the sealing ring, and are more adaptable to different sizes of the sealing ring.

Claims

1. A tool for removing a double-lip seal ring from a helicopter engine, characterized in that, include: - External support frame, which includes a crossbeam and two support rods located on the same side of the crossbeam; - A tensioning mechanism, comprising a guide cylinder fixed in the middle of a crossbeam and in the same direction as the length of a support rod, a threaded cylinder with an irregular cross-section that slides with the guide cylinder, and a first nut that is threaded with the threaded cylinder with the irregular cross-section; the first nut presses against one end of the guide cylinder and slides with it, and the inner wall of the guide cylinder is adapted to the threaded cylinder with an irregular cross-section. - The internal locking mechanism includes a claw mechanism fixed to one end of the irregular cross-section threaded cylinder and a claw expansion and contraction adjustment mechanism located between the irregular cross-section threaded cylinder and the claw mechanism.

2. The tool of claim 1, wherein The outer contour of the irregular cross-section threaded cylinder is oval or semi-circular.

3. The tool of claim 2, wherein The claw expansion / contraction adjustment mechanism includes: - Adjusting screw, which is located inside the irregular cross-section threaded cylinder and is slidably fitted, and its two ends extend to the outside of the irregular cross-section threaded cylinder; - The second nut, which is threadedly engaged with the adjusting screw and located on the outside of the other end of the irregular cross-section threaded cylinder, presses against the end of the irregular cross-section threaded cylinder and slides in fit; - A magnetic adjustment block, comprising an iron shell that is hemispherical in shape and a magnet block disposed inside the iron shell, the spherical surface of which is fixedly connected to one end of an adjustment screw.

4. The tool of claim 3, wherein The gripper mechanism includes: - Connecting cylinder, one end of which is fixed to the end of the irregular cross-section threaded cylinder and arranged coaxially, with its outer diameter being smaller than the diameter of the magnetic adjusting block; - A chuck, which has multiple chucks and is hinged to the outer circumferential wall of the connecting cylinder, includes an iron rod section and a hook section at the free end of the iron rod section. The iron rod section of the chuck is magnetically attracted to the magnetic adjustment block.

5. The tool of claim 4, wherein The end of the hook section of the claw is covered with a rubber coating.

6. The tool of claim 1, wherein The free end of the support rod is provided with a rubber pad.

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