A pin device suitable for connecting rotating parts and a method of using the same

Abstract

The present invention provides a pin device suitable for connecting rotating parts and a method for using the same. The device comprises: a lifting cone, a stop pin and a fixing assembly, wherein the lifting cone comprises a conical portion with circular end faces and a tightening hole located on the conical portion, and the tightening hole is used to move the lifting cone in the stop pin; the stop pin comprises a stop portion and a gap portion, and the stop portion is used to limit the displacement of the stop pin, and the gap portion is used to change the diameter of the stop pin under the action of an external force, and the maximum inner diameter of the stop pin matches the outer diameter of the conical portion; the fixing assembly is used to limit the movement of the lifting cone in the stop pin; the rotating part comprises a pin hole, and a groove matching the stop portion is provided in the pin hole, and the inner diameter of the pin hole matches the maximum outer diameter of the stop pin. The problem of difficulty in disassembling the pin is avoided.

Description

Technical Field

[0001] The invention relates to a pin device suitable for connecting rotating parts and a use method thereof. Background Art

[0002] In aircraft engines and gas turbines, due to structural design reasons, it is often necessary to use a connection structure to connect the originally separated disks or shafts together. Depending on the specific use environment, this type of connection plays the role of fixing, positioning and torque transmission. Among them, pin connection is a commonly used connection method and has been used in aircraft engine and gas turbine rotors.

[0003] At present, commonly used pin connections such as Fig.15 As shown in the figure, the pin is installed from the inner side (close to the axis) of the connected rotor component. This structure can effectively ensure that the pin will not fall out of the pin hole during the operation of the rotor. However, it is more difficult to process blind holes, drill holes and install pins on the inner side of the rotor, and it is not possible at all when the rotor diameter is small. The blind holes on the inside also make it more difficult to visually and fluorescently inspect the components. For example, in Fig.16 In the process, after the pin is installed, the pin hole is punched to cause plastic deformation, thereby preventing the pin from falling out of the pin hole during operation. The disadvantage of this method is that the rotor needs to be plastically deformed during the assembly process, which poses a certain safety hazard. At the same time, due to the deformation of the hole, the diameter of the pin hole needs to be increased significantly after each disassembly, thereby limiting the number of disassembly and assembly. For another example, Fig.17 In the process, a slot is machined in a rotor component, and a stop gasket in the slot is used to prevent the pin from falling out. In this way, non-destructive testing in the slot is difficult, and due to the limited strength of the gasket, it is not suitable for use in high-speed and high-centrifugal force environments. At the same time, in some structural environments, there are situations where slotting on the side is not allowed, which limits the scope of use of this method.

[0004] For the above example, the common method of removing the pin is to drill into the pin with a drill bit smaller than the diameter of the pin and then pull it out of the pin hole. Therefore, the above pin connections are all difficult to remove the pin, and generally the pin will be damaged. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] Current pin connections all have the problem that the pins are difficult to remove, which generally damages the pins, and the tightness of the pins cannot be adjusted.

[0007] (II) Technical solution

[0008] On the one hand, the present invention provides a pin device suitable for connecting rotating parts, the device comprising: a lifting cone, a stopping pin and a fixing assembly, wherein the lifting cone comprises a conical portion with circular end faces and a tightening hole located on the conical portion, the tightening hole is used to enable the lifting cone to move in the stopping pin; the stopping pin comprises a stopping portion and a gap portion, the stopping portion is used to limit the displacement of the stopping pin, the gap portion is used to change the diameter of the stopping pin under the action of an external force, and the maximum inner diameter of the stopping pin matches the outer diameter of the conical portion; the fixing assembly is used to limit the movement of the lifting cone in the stopping pin; the rotating part comprises a pin hole, a groove matching the stopping portion is arranged in the pin hole, and the inner diameter of the pin hole matches the maximum outer diameter of the stopping pin.

[0009] Optionally, the gap portion is two through gaps axially arranged on the stop pin, and the two through gaps divide the stop pin into two parts.

[0010] Optionally, the gap portion is a first through gap axially arranged on the stop pin, and the angle between the first through gap and the diameter direction of the stop pin is 0°.

[0011] Optionally, the gap portion is a second through gap axially arranged on the stop pin, and the second through gap has a preset angle with the diameter direction of the stop pin.

[0012] Optionally, the fixing assembly includes a threaded portion connected to the end of the conical portion with the largest diameter, a nut matching the threaded portion, and an anti-rotation sink arranged at the bottom of the pin hole, wherein the diameter of the threaded portion is smaller than the conical portion, the displacement of the nut is limited by the anti-rotation sink, and the movement of the lifting cone in the stop pin is limited by the engagement of the nut and the threaded portion.

[0013] Optionally, the fixing assembly also includes an anti-loosening pin arranged on the end of the conical portion with the smallest diameter, and an anti-loosening platform arranged at one end of the stop pin, the anti-loosening pin includes at least two first protrusions arranged at intervals, and the anti-loosening platform includes at least two second protrusions arranged at intervals, and the movement of the lifting cone in the stop pin is limited by clamping the first protrusion in the interval gap of the second protrusion.

[0014] Optionally, the cone angle of the conical portion is 2-4°, the inner wall of the stop pin is a conical surface matching the outer wall of the conical portion, and the cone angle of the conical surface is 2-4°.

[0015] Optionally, the stop portion is a stop protrusion angle, the angle of the protrusion angle is 30-45°, and the height of the protrusion angle is 0.5-0.7 mm; the recessed height of the groove in the pin hole is 0.7-0.9 mm.

[0016] Optionally, the tightening hole is arranged at the center of the end of the conical portion with the smallest diameter, and the tightening hole is a hexagonal structure or a dodecagonal structure.

[0017] Optionally, the outer surface of the stop pin and the inner surface of the pin hole have a preset roughness; and the outer surface of the lifting cone is plated with lubricating material.

[0018] On the other hand, the present invention also provides a method for using the pin device described above. During assembly, the lifting cone is placed in the pin hole, and then the stopping pin is placed into the pin hole from the gap between the lifting cone and the pin hole, and the stopping portion enters the groove. The lifting cone is moved by the tightening hole under the action of external force until the diameter of the stopping pin is maximized and fits the inner wall of the pin hole; at this time, the movement of the lifting cone in the stopping pin is limited by the fixing component; during disassembly, the lifting cone is moved by the tightening hole under the action of external force until the diameter of the stopping pin is minimized and leaves the inner wall of the pin hole, the stopping pin is removed from the pin hole, and then the lifting cone is removed from the pin hole.

[0019] (III) Beneficial effects

[0020] (1) The present invention allows the stop pin 1 to be deformed through the slit portion 13 of the stop pin 1, that is, the diameter can change under the action of external force, so that two rotating parts can be connected, and when disassembled, the external force of the jacking cone 2 on the stop pin 1 disappears, and the diameter of the stop pin 1 gradually decreases. The stop portion 12 of the loose stop pin 1 can be removed from the groove 42 by simple tools such as wrenches, pliers, and wooden hammers in general factories (no special equipment is required), so that the stop pin 1 can be taken out of the pin hole 4. The problem of difficult pin disassembly in the prior art is avoided, and damage to the pin device is also avoided.

[0021] (2) The pin device in the present invention has a self-reinforcing effect. When the pin device is applied to the connection of two rotating parts, the higher the rotation speed, the stronger the tensioning effect of the lifting cone 2 and the nut 3 on the stop pin 1 under the action of centrifugal force, so that the stop pin 1 is tightened more tightly in the pin hole.

[0022] (3) The tightness of the pin device in the present invention is adjustable, and the tightening torque of the nut can be adjusted as needed according to the strength and vibration calculation results. That is, the tightness of the pin device can be adjusted by the tightness of the threaded portion 25 of the jacking cone 2 and the nut 3, which solves the problem that the tightness of the pin device in the prior art cannot be adjusted.

[0023] (4) The pin device of the present invention has high reliability. The finite element analysis results can be used to reasonably design the size of the stop pin stopper 12 and the groove 42, so as to prevent the pin device from being separated from the pin hole and failing when the rotating part (such as the rotor) rotates at high speed. When the rotor speed increases, under the action of centrifugal force, the tensioning effect of the jacking cone on the stop pin is strengthened. Under the above tensioning effect, the friction between the sandblasted outer surface of the stop pin and the inner surface of the pin hole (that is, the outer surface of the stop pin and the inner surface of the pin hole have a preset roughness) increases accordingly, providing a second guarantee for the reliability of the pin in the pin hole.

[0024] (5) After long-term operation, if adhesion occurs in the thread or other positions, the lifting cone 2 can be hit with a tool to deform the necking section 23 or the threaded portion 25, so as to successfully complete the disassembly work.

[0025] (6) The engagement between the threaded portion 25 of the lifting cone 2 and the thread of the nut 3 forms a fixed component that limits the movement of the lifting cone 2, that is, prevents the lifting cone 2 from falling back to its original position during the movement between the rotating components.

[0026] (7) The anti-loosening pin 26 and the anti-loosening platform 15 further prevent the thread from loosening, and the first protrusion 26a is clamped in the gap between the second protrusion 15a to limit the movement of the lifting cone 2 in the stop pin 1. This prevents the lifting cone 2 from falling back to its original position during the movement between the rotating components. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] For a more complete understanding of the present application and its advantages, reference will now be made to the following description taken in conjunction with the accompanying drawings, in which:

[0028] Figure 1 The overall structural diagram of the pin device suitable for connecting rotating parts provided by an embodiment of the present invention is schematically shown;

[0029] Figure 2A A schematic diagram of the structure of a jacking cone in a pin device suitable for connecting rotating parts provided in an embodiment of the present invention is shown;

[0030] Figure 2B Schematically shows Figure 2A A-direction structural diagram of the middle jacking cone;

[0031] Figure 3A A schematic diagram of the structure of a stop pin 1 of a pin device suitable for connecting rotating parts provided by an embodiment of the present invention is shown;

[0032] Figure 3B Schematically shows Figure 3A AA cross-sectional structural diagram of the stop pin 1;

[0033] Figure 4A A schematic diagram of the structure of a stop pin 1 of a pin device suitable for connecting rotating parts provided by another embodiment of the present invention is shown;

[0034] Figure 4B Schematically shows Figure 4A AA cross-sectional structural diagram of the stop pin 1;

[0035] Figure 5A A schematic diagram of the structure of a stop pin 1 of a pin device suitable for connecting rotating parts provided in another embodiment of the present invention is shown;

[0036] Figure 5B Schematically shows Figure 5A A schematic diagram of the BB cross-sectional structure of the stop pin 1;

[0037] Figure 6 A schematic diagram of the matching structure of the stopper and the groove of the pin device suitable for connecting the rotating parts provided by the embodiment of the present invention is shown;

[0038] Fig. 7A A schematic diagram of a nut structure of a pin device suitable for connecting rotating parts provided in an embodiment of the present invention is shown;

[0039] Figure 7B Schematically shows Fig. 7A BB section structure schematic diagram of the nut;

[0040] Figure 8 A schematic diagram of the pin hole structure of a pin device suitable for connecting rotating parts provided in an embodiment of the present invention is shown;

[0041] Fig. 9 The schematic diagram of the assembly of the pin device suitable for connecting rotating parts provided by the embodiment of the present invention is shown;

[0042] Fig.10 The schematic diagram of the anti-loosening pin and the anti-loosening platform structure of the pin device suitable for connecting rotating parts provided in an embodiment of the present invention is shown;

[0043] Fig.11 A schematic diagram showing a pin device for connecting rotating parts provided by an embodiment of the present invention applied to a radially mounted rotor;

[0044] Fig.12 Schematically shows Fig.11 AA section structure schematic diagram;

[0045] Fig.13A schematic diagram showing a pin device for connecting rotating parts provided in an embodiment of the present invention being applied to a pull-rod rotor;

[0046] Fig.14 Schematically shows Fig.13 A schematic diagram of the enlarged structure at C;

[0047] Fig.15 A schematic diagram of a conventional pin connection method in the prior art;

[0048] Fig.16 It is a schematic diagram of another traditional pin connection method in the prior art;

[0049] Fig.17 This is a schematic diagram of another traditional pin connection method in the prior art. DETAILED DESCRIPTION

[0050] Below, embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of embodiments of the present invention. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of concepts of the present invention.

[0051] The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. The terms "comprise", "include", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0052] See also Figure 1 , Figure 1 The overall diagram of a pin device suitable for connecting rotating parts provided in an embodiment of the present application includes a stop pin 1, a jacking cone 2, and a jacking nut 3. A pin hole 4 is provided on the rotating part to which the pin device is applied.

[0053] Specifically, see Figure 1 , Figure 2A , Figure 2B , Figure 3 and Figure 8, a pin device suitable for connecting rotating parts provided in an embodiment of the present application includes: a lifting cone 2 and a stopping pin 1, wherein the lifting cone 2 includes a conical portion 22 with circular end faces and a tightening hole 24 located on the conical portion 22, and the tightening hole 24 is used to enable the lifting cone 2 to move in the stopping pin 1 and avoid forming a dead space; the stopping pin 1 includes a stopping portion 12 and a gap portion 13, the stopping portion 12 is used to limit the displacement of the stopping pin 1, the gap portion 13 is used to change the diameter of the stopping pin 1 under the action of an external force, and the maximum inner diameter of the stopping pin 1 is matched with the outer diameter of the conical portion 22, and the fixing assembly is used to limit the movement of the lifting cone 2 in the stopping pin 1; the rotating part includes a pin hole 4, and a groove 42 matching the stopping portion 12 is provided in the pin hole 4, and the inner diameter 41 of the pin hole 4 is matched with the maximum outer diameter of the stopping pin 1.

[0054] When assembling the device, the lifting cone 2 is placed in the pin hole 4, and then the stop pin 1 is placed into the pin hole 4 from the gap between the lifting cone 2 and the pin hole 4, and the stop portion 12 enters the groove 42, and the lifting cone 2 is rotated under the action of external force by tightening the hole 24, that is, it moves in the stop pin 1, and the moving direction is the direction in which the diameter of the stop pin 1 gradually increases until the diameter of the stop pin 1 is maximized and fits the inner wall of the pin hole 4. At this time, the movement of the lifting cone 2 in the stop pin 1 can be limited by the fixing component, that is, the lifting cone 2 and the stop pin 1 are fixed at the position where the diameter of the stop pin 1 is maximized and fits the inner wall of the pin hole 4, thereby connecting the two rotating components. During disassembly, the lifting cone 2 is rotated by tightening the hole 24 under the action of external force until the diameter of the stop pin 1 is minimized and it leaves the inner wall of the pin hole 4, the stop pin 1 is removed from the pin hole 4, and then the lifting cone 2 is removed from the pin hole 4.

[0055] Therefore, the embodiment of the present invention allows the stop pin 1 to be deformed through the gap portion 13 of the stop pin 1, that is, the diameter can change under the action of external force. During assembly, the stop pin 1 gradually increases in diameter under the action of the jacking cone 2, and the jacking cone 2, the stop pin 1 and the pin hole 4 are in a tightly fitted state, that is, the stop pin 1 is in a tensioned state. At this time, it can play the role of connecting the two rotating parts, and the stop portion 12 can be used to prevent the pin device from being disengaged from the pin hole and becoming ineffective under the high-speed rotation of the rotating part (such as the rotor). During disassembly, since the external force of the jacking cone 2 on the stop pin 1 disappears, the diameter of the stop pin 1 gradually decreases, and the stop portion 12 of the loosened stop pin 1 can be moved out of the groove 42 by simple tools such as a wooden hammer, thereby removing the stop pin 1 from the pin hole 4. The problem of difficulty in disassembling the pin in the prior art is avoided, and damage to the pin device is also avoided.

[0056] Furthermore, the stop pin 1 of the present invention can realize the function that its diameter can be changed under the action of external force through various structures. For example, in one feasible manner, Figure 3A and Figure 3B As shown, the gap portion 13 of the stop pin 1 is two through gaps axially arranged on the stop pin 1, and the two through gaps divide the stop pin 1 into two parts. Figure 3B The direction indicated by the middle axial arrow. That is, the stop pin 1 is a structure with a through split 13 in the middle, and the matching relationship between the stop pin outer diameter 14 and the pin hole inner diameter 41 can be selected as a transition fit H7 / js6. With the through split 13, the stop pin 1 can be smoothly installed in the groove 42 in the pin hole 4. When the stop pin 1 is two parts, the two parts can be installed in the pin hole 4 respectively during assembly, and the stop parts 12 on the two parts can be respectively inserted into the groove 42.

[0057] In another possible approach, Figure 4A and Figure 4B As shown, the slit portion 13 is a first through slit 130 axially arranged on the stop pin 1, and the angle between the first through slit 130 and the diameter direction of the stop pin 1 is 0°. Figure 4B The axial direction is as shown by the arrow. The diameter direction of the stop pin 1 is as shown in Figure 4A The direction indicated by the arrow in the middle diameter direction. That is, the single-side radial slit method is adopted.

[0058] In another possible approach, Figure 5A and Figure 5B As shown, the slit portion 13 is a second through slit 131 axially arranged on the stop pin 1, and the second through slit 131 has a preset angle with the diameter direction of the stop pin 1. Figure 5B The axial direction is as shown by the arrow. The diameter direction of the stop pin 1 is as shown in Figure 5A The direction indicated by the arrow in the middle diameter direction. That is, the single-side oblique slit method is adopted, and the slit line is a circular arc.

[0059] The two opening methods of the first through slit 130 and the second through slit 131 utilize the deformation elasticity of the stop pin 1. During the installation stage, a wooden hammer can be used to gently tap downward until the stop portion 12 is inserted into the groove 42 in the pin hole 4.

[0060] Furthermore, the fixing assembly includes a threaded portion 25 connected to the end of the cone portion 22 with the largest diameter, a nut 3 matched with the threaded portion 25, and an anti-rotation sink 43 arranged at the bottom of the pin hole 4, wherein the threaded portion 25 has a diameter smaller than the cone portion 22, and the displacement of the nut 3 is limited by the anti-rotation sink 43, while the movement of the jacking cone 2 in the stop pin 1 is limited by the engagement between the nut 3 and the threaded portion 25. In addition, the tightness of the pin device in the present invention is adjustable, and the tightening torque of the nut can be adjusted as needed according to the strength and vibration calculation results. That is, the tightness of the pin device can be adjusted by the tightness of the thread tightening between the threaded portion 25 of the jacking cone 2 and the nut 3, which solves the problem that the tightness of the pin device in the prior art cannot be adjusted.

[0061] At this time, when assembling the pin device, first screw the lifting cone 2 and the nut 3 together, then place them in the pin hole 4, and confirm that the nut is in the anti-rotation sink 43. After the above work is completed, install the stop pin 1 into the pin hole 4. If the pin structure shown in Figure 3 is selected, the two halves of the stop pin 1 can be respectively installed in the groove 42, and then the lifting cone 2 can be rotated and raised piece by piece using a tool until the stop pin 1 is tightened, that is, the diameter of the stop pin 1 is the largest and fits the inner wall of the pin hole 4. If the pin structure shown in Figures 4 and 5 is selected, the stop pin 1 can be placed behind the mouth of the pin hole 4, and tapped lightly with a wooden hammer to observe the depth of the stop pin 1 inserted into the pin hole 4. After the stop part 12 is inserted into the groove 42, the lifting cone 2 can be rotated and raised piece by piece through the tightening hole 24 using a tool until the stop pin 1 is tightened. For the above installation and assembly process, please refer to. Fig. 9 During disassembly, screw the lifting cone 2 downward until it contacts the top of the nut 3. At this time, the tensioning effect of the lifting cone 2 on the stop pin 1 disappears. After the above work is completed, the stop pin 1 can be removed from the pin hole 4 using conventional tools. After long-term operation, if adhesion occurs in the thread or other positions, the lifting cone 2 can be hit with a tool to deform the necking section 23 or the threaded portion 25 to successfully complete the disassembly work.

[0062] It can be understood by those skilled in the art that the jacking cone 2 and the nut 3 are screwed together, and then placed in the pin hole 4, and the nut 3 is confirmed to be in the anti-rotation sink 43, that is, the nut 3 can be fixed by the anti-rotation sink 43, and when the jacking cone 2 rotates, the nut 3 does not move, and the jacking cone 2 is rotated by the tightening hole 24 under the action of external force, then the threaded portion 25 on the end with the largest diameter of the jacking cone 2 rotates in the nut 3, and the jacking cone 2 moves by the length corresponding to the number of threads after the threaded portion 25 rotates several times, and during this rotation process, once the external force disappears, the threaded portion 25 of the jacking cone 2 and the nut 3 are engaged at the position where the external force disappears, and the engagement between the threads forms a fixed component that limits the movement of the jacking cone 2, that is, prevents the jacking cone 2 from falling back to its original position. In addition, in order to prevent the thread between the threaded portion 25 and the nut 3 from loosening, it is preferred to use a fine pitch thread.

[0063] The threaded portion 25 can be arranged on the necking section 23, the diameter of the necking section 23 is smaller than the conical section 22, and the necking section 23 is connected to the end with the largest diameter of the conical section 22. It is understandable that the threaded portion 25 and the necking section 23 can be the same component, or an external thread of a preset length can be arranged on the necking section 23 away from the end with the largest diameter of the conical section 22, and the external thread section is used as the threaded portion 25. One purpose of the threaded portion 25 or the necking section 23 is to bend and deform the threaded portion 25 or the necking section 23 by hammering after the entire device is difficult to disassemble after running for a period of time, so as to disassemble the entire pin.

[0064] In addition, the internal thread 32 of the nut 3 matches the threaded portion 25 on the jacking cone 2. The thread type can be an MJ thread or a UNJ thread. Under the same thread major diameter, the pitch should be as small as possible to enhance the self-locking performance of the thread. Non-standard pitch can be used when necessary. Referring to FIG. 7 , the stop structure 31 of the nut 3 can be a hexagonal structure. Figure 8 When assembling the pin assembly of the embodiment of the present invention, the nut 3 needs to be placed in the anti-rotation sink 43 at the bottom of the pin hole 4. The anti-rotation sink 43 is located at the bottom of the pin hole 4 and can be a hexagonal structure with a side length slightly larger than the stop structure 31 of the nut 3 to ensure that the nut 3 can move properly at the bottom of the pin hole, so that the nut 3 and the jacking cone 2 can maintain good concentricity with the pin hole 4 during the tightening process. The anti-rotation sink 43 and the stop structure 31 of the nut 3 can also be designed as other structural forms besides hexagonal, such as runway type, quadrilateral, etc., according to the specific use environment and processing methods.

[0065] Further, see Fig.10The fixing assembly also includes an anti-loosening pin 26 arranged on the end of the cone portion 22 with the smallest diameter, and an anti-loosening platform 15 arranged at one end of the stop pin 1, wherein the anti-loosening pin 26 includes at least two first protrusions 26a arranged at intervals, and the anti-loosening platform 15 includes at least two second protrusions 15a arranged at intervals, and the movement of the jacking cone 2 in the stop pin 1 is limited by clamping the first protrusion 26a in the interval gap of the second protrusion 15a. After the thread screwing work in the fixing assembly is completed, the first protrusion 26a of the anti-loosening pin 26 is tapped to deform it and enter the interval gap of the second protrusion 15a of the anti-loosening platform 15 (i.e., the groove formed between the second protrusions 15a), thereby achieving the purpose of thread anti-loosening. When disassembling, use a wooden hammer to knock the anti-loosening pin out of the above-mentioned groove.

[0066] In addition, the cone angle of the conical portion 22 is 2-4°, the inner wall of the stop pin 1 is a conical surface matched with the outer wall 21 of the conical portion 22, and the cone angle of the conical surface is 2-4°.

[0067] See also Figure 6 In order to improve the convenience of installing the stop pin 1, both sides of the stop part 12 are at a certain angle. The stop part 12 is a stop protrusion angle 122. The angle of the stop protrusion angle 122 can be 30°~45°, and the height of the stop protrusion angle 122 is 0.5-0.7mm; the structural characteristics of the groove 42 in the pin hole 4 are similar to the stop protrusion 12, except that the concave height of the groove 42 is slightly higher than the stop protrusion height by about 0.2mm. That is, the height of the groove 42 in the pin hole 4 is 0.7-0.9mm. All transitions in the above two structures of the stop (i.e., the stop part 12 and the groove 42) must have a smooth transition. The specific size must be determined based on the selected pin structure, material and specific use environment of the pin, and determined after finite element strength analysis.

[0068] The tightening hole 24 is disposed at the center of the end of the conical portion 22 with the smallest diameter, and the tightening hole 24 is a hexagonal structure or a dodecagonal structure.

[0069] When manufacturing the pin device provided by the embodiment of the present invention, the outer sides of the threaded portion 25 and the conical portion 22 are silver-plated. The stop pin 1 is manufactured by laser cutting after precision turning. The outer side of the stop pin 1 and the inner side of the pin hole are sandblasted to increase the surface roughness so that the outer surface of the stop pin and the inner surface of the pin hole have a preset roughness. In addition, the outer surface of the lifting cone is plated with lubricating material. In order to ensure good concentricity between the various parts of the pin hole 4, during manufacturing, after the rotating parts to be connected meet their respective positioning requirements and are well fixed, they are processed into place by collaborative drilling and reaming.

[0070] A specific usage scenario of the structure of the present invention is as follows Fig.11 and Fig.12 As shown. Fig.11 As shown, the sealing rotating member 5 is sleeved on the turbine shaft 6, and the centering and axial positioning are achieved through the sleeve rotor radial positioning surface 71 and the sleeve rotor axial positioning surface 72. The connection structure plays the role of fixing, positioning and transmitting torque.

[0071] Another specific use scenario of the pin device of the present invention is as follows Fig.13 and Fig.14 As shown. The disc-type tie rod rotor 10 is a widely used structure in gas turbine rotors. In this rotor, long bolts 93 evenly distributed in the circumference press the multi-stage wheels tightly, and the torque is transmitted by the end surface friction. At the same time, in this type of rotor, it is also a common structure to use pins between the wheels to assist in torque transmission. Fig.14 As shown, for the convenience of description, the two adjacent wheels are referred to as the left wheel 8 and the right wheel 9. The wheels are provided with an axial positioning surface 92 and a radial positioning surface 91 to respectively ensure the axial positioning and centering between the wheels. After the wheel disc parts are drilled with pin holes, the pin assembly structure of the present invention can be used to achieve the purpose of auxiliary torque transmission.

[0072] Another embodiment of the present invention provides a method for using the pin device described above. Specifically, during assembly, the lifting cone 2 is placed in the pin hole 4, and then the stopping pin 1 is placed into the pin hole 4 from the gap between the lifting cone 2 and the pin hole 4, and the stopping portion 12 enters the groove 42, and the lifting cone 2 is moved under the action of external force through the tightening hole 24 until the diameter of the stopping pin 1 is maximized and fits the inner wall of the pin hole 4; at this time, the movement of the lifting cone 2 in the stopping pin 1 is limited by the fixing component; during disassembly, the lifting cone 2 is moved through the tightening hole 24 under the action of external force until the diameter of the stopping pin 1 is minimized and leaves the inner wall of the pin hole 4, the stopping pin 1 is removed from the pin hole 4, and then the lifting cone 2 is removed from the pin hole 4.

[0073] It will be appreciated by those skilled in the art that the features described in the various embodiments and / or claims of the present invention may be combined and / or combined in various ways, even if such combinations and / or combinations are not explicitly described in the present invention. In particular, the features described in the various embodiments and / or claims of the present invention may be combined and / or combined in various ways without departing from the spirit and teachings of the present invention. All of these combinations and / or combinations fall within the scope of the present invention.

[0074] Although the present invention has been shown and described with reference to specific exemplary embodiments of the present invention, it should be understood by those skilled in the art that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined by the appended claims and their equivalents. Therefore, the scope of the present invention should not be limited to the above-mentioned embodiments, but should be determined not only by the appended claims, but also by the equivalents of the appended claims.

Claims

1. A pin device suitable for connecting rotating parts, characterized in that: The device comprises: a lifting cone (2), a stop pin (1) and a fixing assembly, The lifting cone (2) comprises a conical portion (22) with circular end faces and a tightening hole (24) located on the conical portion (22), the tightening hole (24) being used to enable the lifting cone (2) to move in the stop pin (1); the stop pin (1) comprises a stop portion (12) and a slit portion (13), the stop portion (12) being used to limit the displacement of the stop pin (1), the slit portion (13) being used to change the diameter of the stop pin (1) under the action of an external force, and the maximum inner diameter of the stop pin (1) being matched with the outer diameter of the conical portion (22); the fixing assembly being used to limit the movement of the lifting cone (2) in the stop pin (1); The rotating component comprises a pin hole (4), a groove (42) matching with the stopper (12) is arranged in the pin hole (4), and the inner diameter of the pin hole (4) matches with the maximum outer diameter of the stop pin (1); The fixing assembly comprises a threaded portion (25) connected to the end of the conical portion (22) with the largest diameter, a nut (3) matched with the threaded portion (25), and an anti-rotation sink (43) arranged at the bottom of the pin hole (4), wherein the threaded portion (25) has a diameter smaller than that of the conical portion (22), the anti-rotation sink (43) limits the displacement of the nut (3), and the engagement of the nut (3) with the threaded portion (25) limits the movement of the lifting cone (2) in the stop pin (1); An anti-loosening pin (26) is arranged on the end of the conical portion (22) with the smallest diameter, and an anti-loosening platform (15) is arranged at one end of the stop pin (1), wherein the anti-loosening pin (26) includes at least two first protrusions (26a) arranged at intervals, and the anti-loosening platform (15) includes at least two second protrusions (15a) arranged at intervals, and the movement of the lifting cone (2) in the stop pin (1) is restricted by clamping the first protrusion (26a) in the interval gap of the second protrusion (15a).

2. The device according to claim 1, characterized in that The slit portion (13) is two through slits axially arranged on the stop pin (1), and the two through slits divide the stop pin (1) into two parts.

3. The device according to claim 1, characterized in that The slit portion (13) is a first through slit (130) axially arranged on the stop pin (1), and the angle between the first through slit (130) and the diameter direction of the stop pin (1) is 0°.

4. The device according to claim 1, characterized in that The slit portion (13) is a second through slit (131) axially arranged on the stop pin (1), and the second through slit (131) has a preset angle with respect to the diameter direction of the stop pin (1).

5. The device according to claim 1, characterized in that The cone angle of the conical portion (22) is 2-4°, the inner wall of the stop pin (1) is a conical surface that matches the outer wall of the conical portion (22), and the cone angle of the conical surface is 2-4°.

6. The device according to claim 1, characterized in that The stop portion (12) is a stop convex angle, the angle of the convex angle is 30-45 degrees, and the height of the convex angle is 0.5-0.7 mm; the recessed height of the groove (42) in the pin hole (4) is 0.7-0.9 mm.

7. The device according to claim 1, characterized in that The tightening hole (24) is arranged at the center of the end of the conical portion (22) with the smallest diameter, and the tightening hole (24) is a hexagonal structure or a dodecagonal structure.

8. A method of using the pin device according to any one of claims 1 to 7, characterized in that: During assembly, the lifting cone (2) is placed in the pin hole (4), and then the stop pin (1) is inserted into the pin hole (4) from the gap between the lifting cone (2) and the pin hole (4), and the stop portion (12) is inserted into the groove (42). The lifting cone (2) is moved by tightening the hole (24) under the action of an external force until the diameter of the stop pin (1) is maximized and fits the inner wall of the pin hole (4); at this time, the movement of the lifting cone (2) in the stop pin (1) is limited by the fixing assembly; During disassembly, the lifting cone (2) is moved by tightening the hole (24) under the action of external force until the diameter of the stop pin (1) is minimized and the stop pin (1) is separated from the inner wall of the pin hole (4). The stop pin (1) is removed from the pin hole (4), and then the lifting cone (2) is removed from the pin hole (4).

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