Low-stress decomposition device and method for engine guide vane positioning pin

Abstract

The invention discloses a low-stress decomposition device and method for an engine guide vane positioning pin, the low-stress decomposition device comprises a special-shaped support block, a nut top block, a screw, a stop handle and a straight handle, the special-shaped support block is arranged on the upper surface of a support ring on a guider and is used as a decomposition fulcrum, and the stop handle is arranged on the special-shaped support block and is used for fixing the position of the special-shaped support block; the nut ejecting block is connected to the outer wall of the special-shaped supporting block, the screw penetrates through the nut ejecting block from the top of the nut ejecting block and is used for being connected with a guide vane positioning pin in the special-shaped supporting block, and the nut ejecting block is provided with a straight handle used for adjusting the position of the nut ejecting block when the screw is connected with the guide vane positioning pin. The disassembling mode that a traditional hammer applies force to the head of the positioning pin through a core rod is changed, the problem of disassembling the guide vane positioning pin under narrow curved surface wrapping is effectively solved, the disassembling efficiency of the guide vane positioning pin is greatly improved, the disassembling tool is suitable for engine guide vane assembling, and efficient low-stress disassembling of the guide vane positioning pin can be achieved.

Description

Technical Field

[0001] This invention belongs to the field of engine technology, specifically to a low-stress decomposition device and method for engine guide vane locating pins. Background Technology

[0002] The disassembly of engine guide vane locating pins is a crucial step in the manufacturing and maintenance of aero-engines. As a core component of the engine, the guide vane's locating pins form a rigid connection with the upper support ring through an interference fit, ensuring structural stability under high-temperature and high-pressure conditions. This technology is widely used in civil aviation, military aviation, and gas turbine fields, with typical applications including guide vane replacement and locating pin wear repair during engine overhauls. Industry data shows that a single large aero-engine contains 30-50 guide vane locating pins, and the efficiency of their disassembly directly affects the overall engine maintenance cycle.

[0003] Because the head of the locating pin is completely enclosed by the narrow curved surface of the guide vane, the operating space is limited to a cylindrical area with a diameter of less than 20mm. Figure 1 As shown, traditional hammer-mandrel combination tools require multiple strikes to accumulate impact force, resulting in a single locating pin taking 8-12 minutes to disassemble, and the entire engine disassembly operation taking up to 4 hours. Even more seriously, the eccentric torque generated during the striking process can easily cause micro-cracks in the guide vane blades. How to achieve precise, uniform, and controllable application of axial force within a cylindrical space with a diameter of 20mm, while reducing the single-piece operation time to less than 1 minute and ensuring that the guide vane damage rate is less than 0.5%? This technological bottleneck has become a key factor restricting the maintenance efficiency of aero-engines, and innovative mechanical transmission mechanisms and tool structure designs are urgently needed. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a low-stress decomposition device and method for engine guide vane locating pins. It changes the traditional decomposition method of applying force to the head of the locating pin with a hammer via a mandrel, effectively solving the problem of decomposing guide vane locating pins under narrow curved surfaces, greatly improving the decomposition efficiency of guide vane locating pins, and is suitable for engine guide vane assembly, enabling efficient and low-stress decomposition of guide vane locating pins.

[0005] In order to achieve the above object, the present application provides the following technical scheme: a low-stress disassembling device for an engine guide vane positioning pin, comprising a special-shaped support block, a nut top block, a screw, a stop handle and a straight handle, the special-shaped support block is arranged on the upper surface of a support ring of a guide device and serves as a disassembling support point, the stop handle is arranged on the special-shaped support block and serves to fix the position of the special-shaped support block, the nut top block is connected to the outer wall of the special-shaped support block, the screw passes through the nut top block from the top of the nut top block and serves to be connected with the guide vane positioning pin in the special-shaped support block, and the straight handle is arranged on the nut top block and serves to adjust the position of the nut top block when the screw is connected with the guide vane positioning pin.

[0006] Further, the special-shaped support block comprises a base, a connecting part is fixed on the base, the stop handle is fixed on one side of the base, through connection holes are arranged on the base and the connecting part, the base is arranged on the upper surface of the support ring of the guide device in a matched manner, the guide vane positioning pin is located in the through connection hole on the base, and the nut top block is sleeved on the connecting part.

[0007] Further, the base and the connecting part are integrally formed.

[0008] Further, the connecting part is a cylindrical connecting part, external threads are arranged on the cylindrical connecting part, the nut top block is threadedly connected with the cylindrical connecting part, a first through connection hole is arranged in the middle of the cylindrical connecting part, a second through connection hole is arranged in the base, and the base is sleeved on the guide vane positioning pin through the second through connection hole.

[0009] Further, a first internal thread blind hole is arranged on the side surface of the base of the special-shaped support block, and one end of the stop handle is arranged in the first internal thread blind hole.

[0010] Further, a third through connection hole is arranged in the middle of the nut top block, the third through connection hole is used for placing the screw, a second internal thread blind hole is arranged on the side surface of the nut top block, and one end of the straight handle is connected in the second internal thread blind hole.

[0011] Further, the stop handle and the straight handle are located on the same side of the special-shaped support block, an anti-skid pattern is arranged at the end of the stop handle, and the outer surface of the straight handle is knurled.

[0012] Further, the nut top block and the screw are both made of stainless steel.

[0013] Further, the bottom of the nut top block is provided with a step for mounting an adjusting pad, and the adjusting pad is matched with the screw in specification.

[0014] The present application also provides a disassembling method for an engine guide vane positioning pin, which is performed by using the above low-stress disassembling device for an engine guide vane positioning pin, and the specific steps are as follows: Put the special-shaped support block on the guide vane positioning pin, and make the bottom surface of the special-shaped support block base contact the upper surface of the upper support ring; Support the special-shaped support block by the stop handle, adjust the position of the nut top block on the special-shaped support block by the straight handle, and the position of the nut top block should realize the connection of the screw and the guide vane positioning pin; Put one end of the screw on the nut top block, and the other end is connected with the guide vane positioning pin, adjust the position of the nut top block by the straight handle, when the nut top block moves away from the special-shaped support block base, the screw and the guide vane positioning pin are disassembled.

[0015] Compared with the prior art, the present application has at least the following beneficial effects: The present application provides a low-stress disassembly device for engine guide vane positioning pin, which adopts the design of nut top block cooperating with straight handle, so that the operator can conveniently apply torque to the nut top block, realize low-stress disassembly of guide vane positioning pin, greatly reduce the dependence on tools in the operation process, simplify the cumbersome operation steps, significantly reduce the operation strength, and improve the overall work efficiency. Through the close cooperation of the special-shaped support block and the upper support ring, the stability and safety of the guide vane positioning pin during disassembly are ensured, accidental accidents caused by improper operation are effectively prevented, damage to the guide vane caused by excessive stress is avoided, the service life of the guide vane is prolonged, downtime and maintenance costs caused by accidental accidents are reduced, and the safety of the operator is ensured.

[0016] The present application changes the traditional hammer force disassembly mode to the positioning pin head through the core rod, solves the disassembly problem of the guide vane positioning pin wrapped in a narrow curved surface, can realize efficient and low-stress disassembly of the guide vane positioning pin, and improves the disassembly efficiency by about 92%, while reducing the operation strength, improving the disassembly safety, eliminating the risk of damaging the guide vane, and significantly improving the part surface quality.

[0017] The reliable disassembly of the guide vane positioning pin is realized, the operation is simple and convenient, and it is especially suitable for maintenance work in a narrow space, and the operation convenience in a narrow space is improved. The disassembly device has good universality, can adapt to guide vane positioning pins of different specifications and models, fully meets the diversified needs in the field of aero-engine maintenance, does not need to be equipped with multiple disassembly devices for guide vane positioning pins of different specifications, saves equipment procurement cost, and brings a new solution to the field of aero-engine maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The installation structure of the guide vane positioning pin is shown in the figure; Figure 2 The disassembly device structure design drawing of the guide vane positioning pin is shown in the figure; Figure 3The exploded view of the guide vane positioning pin; Figure 4 The exploded view of the guide vane positioning pin; In the figure: 1, special-shaped supporting block; 2, nut top block; 3, screw; 4, stop handle; 5, straight handle; 6, upper supporting ring; 7, guide vane; 8, guide vane positioning pin. DETAILED DESCRIPTION

[0019] The application will be further described below in combination with the drawings and specific embodiments.

[0020] Example 1 The application provides a low-stress disassembling device for an engine guide vane positioning pin, which can effectively reduce the operation strength, improve the disassembling safety and efficiency, and eliminate the risk of damaging the guide vane. The purpose of the device is achieved through the following steps: As Figures 2-3 shown, the application provides a low-stress disassembling device for an engine guide vane positioning pin, which includes a special-shaped supporting block 1, a nut top block 2, a screw 3, a stop handle 4, a straight handle 5, an upper supporting ring 6, a guide vane 7, and a guide vane positioning pin 8. The special-shaped supporting block 1 includes a base, a connecting part, and a straight handle 5. The base and the connecting part are integrally formed, and both of them are provided with a through connecting hole. The straight handle 5 is fixed on the base. The base is used to cooperate with the upper surface of the supporting ring 6 arranged on the guide and to be sleeved on the guide vane positioning pin 8. The connecting part is used to connect the nut top block 2. The nut top block 2 is sleeved on the connecting part. The straight handle 5 is arranged on the nut top block 2. The screw 3 is arranged on the top of the nut top block 2. The screw 3 is used to connect the guide vane positioning pin 8 in the special-shaped supporting block 1 through the nut top block 2.

[0021] Preferably, the bottom surface of the base of the special-shaped supporting block 1 cooperates with the shape of the upper surface of the upper supporting ring 6 of the guide. The special-shaped supporting block 1 takes the upper surface of the upper supporting ring 6 of the guide as the reference surface, thereby constituting a disassembling supporting point. The upper surface of the base of the special-shaped supporting block 1 is provided with a cylindrical connecting part. The cylindrical connecting part is provided with an external thread, which is used to install the nut top block 2. A first through connecting hole is arranged in the middle of the cylindrical connecting part. A second through connecting hole is arranged in the base. A first internal thread blind hole is arranged in the side surface of the base of the special-shaped supporting block 1, which is used to install the stop handle 4 and stop the special-shaped supporting block 1.

[0022] A third through connecting hole is arranged in the middle of the nut top block 2. A second internal thread blind hole is arranged in the side surface of the nut top block 2, which is used to connect the straight handle 5 and apply torque to the nut top block 2.

[0023] The screw 3 is screwed with the guide vane positioning pin 8 through the third through connecting hole of the nut top block 2, the first through connecting hole in the middle of the cylindrical connecting part and the second through connecting hole in the base. Preferably, the stop handle 4 and the straight handle 5 are located on the same side of the special-shaped supporting block 1, the end of the stop handle 4 is provided with anti-skid lines matched with the threads of the first internal thread blind hole, and the outer surface of the straight handle 5 is knurled to prevent slipping when holding.

[0024] Preferably, the nut top block 2 and the screw 3 are made of stainless steel, which has good wear resistance and corrosion resistance.

[0025] Preferably, the bottom of the nut top block 2 is provided with a step for installing an adjusting pad. The adjusting pad is designed in different specifications to match different specifications of the screw 3. The screw 3 is connected and fixed with the guide vane positioning pin 8 through the adjusting pad and the special-shaped supporting block 1, and the threaded end is connected to the internal thread of the guide vane positioning pin 8 to achieve the purpose of disassembly.

[0026] As shown in Figure 4 The upper supporting ring 6 is the core bearing component of the guide, and the inner side thereof is uniformly distributed with vane positioning grooves. The upper end of the guide vane 7 is circumferentially positioned through the positioning grooves, so that multiple guide vanes 7 are uniformly and spacedly distributed in the circumferential direction. Meanwhile, the lower surface of the upper supporting ring 6 is planarly positioned with the upper end surface of the guide vane 7, so that the installation height of the guide vane 7 in the axial direction is consistent, and airflow guiding disorder caused by height deviation is avoided. The guide vane positioning pin 8 adopts a cylindrical structure, and the axis thereof is perpendicular to the radial direction (or the axial direction, according to design requirements) of the upper supporting ring 6. The bottom of the vane positioning groove of the upper supporting ring 6 is provided with a positioning pin mounting hole, and the upper end of the guide vane 7 is provided with a pin hole at the corresponding position. The guide vane positioning pin 8 is installed in the mounting hole of the upper supporting ring 6 and the pin hole of the guide vane 7 in an interference fit manner. The diameter of the positioning pin mounting hole of the upper supporting ring 6 is slightly smaller than the diameter of the guide vane positioning pin 8 (the interference amount is usually 0.01-0.03 mm). The guide vane positioning pin 8 is pressed into the mounting hole through a press fitting process, so that the pin body does not loosen during work, realizes radial positioning of the two, limits the rotation of the guide vane 7 around its own axis, and prevents the guide vane 7 from moving in the radial direction (perpendicular to the engine axis direction).

[0027] When disassembled for subsequent maintenance, a disassembly threaded hole is formed at one end of the guide vane positioning pin 8, and the guide vane positioning pin 8 is taken out using the low-stress disassembly device of the engine guide vane positioning pin. The disassembly process of the guide vane positioning pin 8 is as follows: First, the special-shaped support block 1 is sleeved on the guide vane positioning pin 8 until it is in contact with the upper surface of the upper support ring 6, and the special-shaped support block 1 is supported by the stop handle 4 with one hand to ensure that it remains stable during disassembly, then the nut block 2 with a straight handle 5 is assembled on the special-shaped support block 1, and the screw 3 is connected with the guide vane positioning pin 8, and then the nut block 2 is evenly loosened with the other hand, so that the guide vane positioning pin 8 can be efficiently and low-stress disassembled, and the damage to the guide vane can be avoided. After the screw 3 and the guide vane positioning pin 8 are disassembled, the disassembly device of the guide vane positioning pin is used for subsequent disassembly of the guide vane positioning pin. In this way, the operator can quickly complete the disassembly of the guide vane positioning pin without additional tools, and the convenience and efficiency of the operation are improved.

[0028] Embodiment 2 The low-stress disassembly device of the engine guide vane positioning pin comprises a special-shaped support block 1, a nut block 2 and a screw 3. The special-shaped support block 1 comprises a base, a connecting part and a straight handle 5. The base and the connecting part are provided with through connecting holes. The straight handle 5 is fixed on the base. The base is used to cooperate with the upper surface of the upper support ring 6 of the guider and is sleeved on the guide vane positioning pin 8. The connecting part is used to connect the nut block 2. The bottom surface of the base is in plane cooperation with the upper surface of the upper support ring 6 of the guider, and the special-shaped support block 1 takes the upper surface of the upper support ring 6 of the guider as a reference surface, thereby forming a disassembly support point. A cylindrical connecting part is arranged on the upper surface of the base. An external thread is arranged on the cylindrical connecting part, which is used to install the nut block 2. A first through connecting hole is arranged in the middle of the cylindrical connecting part, and a second through connecting hole is arranged in the base. A first internal thread blind hole is arranged on the side surface of the base of the special-shaped support block 1, which is used to install the stop handle 4.

[0029] The nut block 2 is sleeved on the connecting part, and the straight handle 5 is arranged on the nut block 2. A third through connecting hole is arranged in the middle of the nut block 2. The screw 3 is arranged on the top of the nut block 2 and passes through the third through connecting hole. The screw 3 is used to pass through the nut block 2 and connect with the guide vane positioning pin 8 in the special-shaped support block 1. A second internal thread blind hole 19 is designed on the side surface of the nut block 2, which is used to connect the straight handle 5.

[0030] Preferably, the bottom of the nut block 2 is provided with a step 20, which is used to install an adjusting pad 21. The adjusting pad 21 is made of stainless steel and has a thickness of 0.5mm-1mm. It can match the M6-M12 specification screw 3. The screw 3 passes through the adjusting pad 21, the special-shaped support block 1 and is connected with the guide vane positioning pin 8. The threaded end is connected to the internal thread of the guide vane positioning pin 8, so as to achieve the purpose of disassembly.

[0031] The stop handle 4 and the straight handle 5 are located on the left side of the special-shaped support block 1. The end of the stop handle 4 is provided with anti-slip patterns, which are matched with the threads of the first internal threaded blind hole. This design ensures that the stop handle 4 can maintain a stable state during use, avoiding accidental sliding or falling due to manual operation. The outer surface of the straight handle 5 is knurled to prevent slipping when holding. Knurling not only enhances the grip of the straight handle 5, but also effectively improves its operation reliability in wet environments.

[0032] Preferably, the special-shaped support block 1 acts as a decomposition support point, needs to withstand axial pressure during decomposition, and the base needs to be in plane cooperation with the upper surface of the upper support ring 6, needs good wear resistance and rigidity; Preferably, the nut top block 2 cooperates with the cylindrical connecting part of the special-shaped support block 1 to transmit decomposition force through threads, and needs good thread strength and shear resistance; Preferably, the nut top block 2 and the screw 3 are made of stainless steel, which has good wear resistance and corrosion resistance. This material selection ensures the durability and reliability of the nut top block 2 and the screw 3 during long-term use, reducing the frequency of maintenance and replacement due to wear or corrosion.

[0033] The low-stress disassembling device for the guide vane positioning pin of an engine provided by the application realizes a major innovation in the disassembling operation of the guide vane positioning pin 8, discards the backward disassembling mode of applying force to the head of the positioning pin through a core rod by means of a hammer, and provides an innovative solution to the disassembling problem of the guide vane positioning pin 8 wrapped in a narrow curved surface, which exhibits significant advantages in efficiency improvement, operation optimization, structure improvement, safety guarantee, and generalization enhancement. The traditional mode often leads to disassembling difficulty and low efficiency due to space limitation and inconvenient force application when facing the guide vane positioning pin wrapped in a narrow curved surface. The disassembling device of the application ingeniously changes the force application mode, effectively solves this problem, and greatly improves the disassembling efficiency of the guide vane positioning pin 8 by about 92%. At the same time, the design of the nut top block 2 cooperating with the straight handle 5 enables the operator to conveniently apply torque to the nut top block 2, realizing low-stress disassembling of the guide vane positioning pin 8. This not only greatly reduces the dependence on tools during operation, but also simplifies the cumbersome operation steps, making the originally difficult maintenance work in a narrow space more convenient and efficient, significantly reducing the operation strength, and improving the overall work efficiency. Through the close cooperation of the special-shaped supporting block 1 and the upper supporting ring 6, the stability and safety of the guide vane positioning pin 8 during disassembling are ensured, accidental accidents caused by improper operation are effectively prevented, damage to the guide vane 7 caused by excessive stress is avoided, the service life of the guide vane 7 is prolonged, downtime and repair costs caused by accidental accidents are reduced, and the safety of the operator is guaranteed. The disassembling device of the application can adapt to guide vane positioning pins 8 of different specifications and models, fully meeting the diversified needs of the field of aero-engine maintenance, and without the need to equip different specifications of guide vane positioning pins 8 with multiple disassembling devices, which not only saves equipment procurement costs, but also brings a new solution to the field of aero-engine maintenance.

Claims

1. A low-stress decomposition device for engine guide vane locating pins, characterized in that, The device includes a shaped support block (1), a nut top block (2), a screw (3), a stop handle (4), and a straight handle (5). The shaped support block (1) is set on the upper surface of the support ring (6) of the guide to serve as a disassembly fulcrum. The stop handle (4) is set on the shaped support block (1) to fix the position of the shaped support block (1). The nut top block (2) is connected to the outer wall of the shaped support block (1). The screw (3) passes through the nut top block (2) from the top to connect with the guide vane positioning pin (8) in the shaped support block (1). The straight handle (5) is set on the nut top block (2) to adjust the position of the nut top block (2) when the screw (3) is connected with the guide vane positioning pin (8).

2. The low-stress decomposition device for engine guide vane positioning pins according to claim 1, characterized in that, The irregular support block (1) includes a base, a connecting part fixed on the base, a stop handle (4) fixed on one side of the base, and through connecting holes provided on both the base and the connecting part. The base is fitted on the upper surface of the support ring (6) on the guide, the guide vane positioning pin (8) is located in the through connecting hole on the base, and the nut top block (2) is sleeved on the connecting part.

3. The low-stress decomposition device for engine guide vane positioning pins according to claim 2, characterized in that, The base and the connecting part are integrally formed.

4. The low-stress decomposition device for engine guide vane positioning pins according to claim 2, characterized in that, The connecting part is a cylindrical connecting part with an external thread. The nut top block (2) is threadedly connected to the cylindrical connecting part. A first through connecting hole is provided in the middle of the cylindrical connecting part, and a second through connecting hole is provided in the middle of the base. The base is sleeved on the guide vane positioning pin (8) through the second through connecting hole.

5. A low-stress decomposition device for an engine guide vane positioning pin according to claim 2, characterized in that, The base of the irregular support block (1) has a first internal thread blind hole on its side, and one end of the stop handle (4) is set in the first internal thread blind hole.

6. The low-stress decomposition device for engine guide vane positioning pins according to claim 1, characterized in that, The nut top block (2) has a third through connection hole in the middle, which is used to place the screw (3). The nut top block (2) has a second internal thread blind hole on its side, and one end of the straight handle (5) is connected to the second internal thread blind hole.

7. The low-stress decomposition device for engine guide vane positioning pins according to claim 1, characterized in that, The stop handle (4) and the straight handle (5) are located on the same side of the irregular support block (1). The end of the stop handle (4) is provided with anti-slip texture, and the outer surface of the straight handle (5) is knurled.

8. A low-stress decomposition device for an engine guide vane positioning pin according to claim 1, characterized in that, Both the nut top block (2) and the screw (3) are made of stainless steel.

9. A low-stress decomposition device for an engine guide vane positioning pin according to claim 1, characterized in that, The bottom of the nut top block (2) is provided with a step for installing an adjustment pad, the size of which matches the screw (3).

10. A method for disassembling a positioning pin for an engine guide vane, characterized in that, The low-stress decomposition device for engine guide vane locating pins, as described in any one of claims 1 to 9, is used, and the specific steps are as follows: Place the irregular support block (1) onto the guide vane positioning pin (8) so that the bottom surface of the base of the irregular support block (1) contacts the upper surface of the upper support ring (6); The irregular support block (1) is straightened by the stop handle (4), and the position of the nut top block (2) on the irregular support block (1) is adjusted by the straight handle (5). The position of the nut top block (2) should realize the connection between the screw (3) and the guide vane positioning pin (8). Secure one end of the screw (3) to the nut top block (2) and connect the other end to the guide vane positioning pin (8). Use the straight handle (5) to adjust the position of the nut top block (2). When the nut top block (2) moves away from the base of the irregular support block (1), remove the screw (3) and the guide vane positioning pin (8).

Images