Engine deep groove retainer mounting and dismounting device

Abstract

The application belongs to the field of installing and dismounting of a check ring, and discloses an engine deep cavity check ring installing and dismounting device, which comprises a transmission actuating mechanism, a positioning shaft sleeve and a floating mechanism. The transmission positioning mechanism comprises a long pull rod, a short connecting pipe, a long connecting pipe and a taper head pull rod. The rear end of the long pull rod is connected with a pipe joint, the rear end of the long pull rod is connected with the taper head pull rod through a shaft coupling, two pairs of shift fork support shafts, rotary shift forks and a jack pin are symmetrically arranged on the pipe joint. The shift fork support shafts are fixed on the pipe joint, a shift fork spring is arranged between the two pairs of rotary shift forks, and the jack pin is arranged between the taper pull rod and the rotary shift fork. The bottom of the rotary shift fork is provided with a shift pin for shifting the check ring. The positioning shaft sleeve cooperates with the outer end surface of a rotor assembly to form a first repositioning control, the connecting knob drives the positioning shaft sleeve and the floating positioning sleeve to continue to move forward and perform axial fine adjustment, thereby realizing a second repositioning control. The double repositioning control effectively improves the assembly precision.

Description

An engine deep cavity retaining ring installation and removal device Technical Field

[0001] This application belongs to the field of retaining ring installation and removal, and specifically relates to a device for installing and removing engine deep cavity retaining rings. Background Technology

[0002] Retaining rings for holes are typically installed inside round holes in machine parts to fix the axial movement of components within the cavity. The outer diameter of the retaining ring is larger than the inner diameter of the assembled machine part. During installation / removal, snap ring pliers are generally used. The pliers are inserted into the clamping holes of the retaining ring, clamping it to reduce its size and deform it, and then it can be inserted / removed from the designated mounting slot. The retaining ring structure is shown in Figure 1.

[0003] The center of a certain engine rotor assembly has a small-diameter, deep cavity structure. A retaining ring with a hole is installed on a related part at the bottom of the cavity, as shown in Figure 2. Installing / removing this retaining ring requires passing through a 1.8m deep cavity of the rotor assembly (with maximum and minimum inner diameters of 139mm and 118mm respectively) to reach the front face of part 1. The retaining ring must deform while accurately locating the mounting slot. This entire installation and removal operation exceeds the ergonomically perceptible and reachable distance for personnel, and cannot be easily accomplished manually using snap ring pliers.

[0004] Existing methods for clamping retaining rings with snap ring pliers have the following main drawbacks:

[0005] 1) The application environment of the existing snap ring clamping method requires the visibility and accessibility to meet the ergonomic conditions. That is, the operator must not only be able to see the position where the snap ring is to be inserted / removed, but also need to use his / her hands to control the snap ring clamp jaws to insert into the clamp hole and deform the snap ring accordingly in order to insert / remove it. The small-diameter, deep-cavity assembly structure mentioned in this article is obviously no longer applicable.

[0006] 2) Existing snap ring pliers installation methods lack reliable clamping mechanisms. However, since these methods are generally used in positions accessible by hand and sight, even if the snap ring accidentally falls off before reaching the target position, the operator can usually quickly locate the fall point visually and have enough space to remove the snap ring for reinstallation / removal. However, for assembly structures with small diameters, deep cavities, and varied internal shapes, once the snap ring falls off, it is not only difficult to locate visually, but even if the location is found, it is also difficult to remove.

[0007] Therefore, there is an urgent need for a safe and reliable device to enable the installation and removal of the retaining ring in a small-diameter, deep cavity. Summary of the Invention

[0008] The purpose of this application is to provide an engine deep cavity retaining ring installation and removal device to solve the current problem of the difficulty in safely and reliably installing and removing small-diameter, deep-cavity retaining rings.

[0009] The technical solution of this application is: an engine deep cavity retaining ring installation and removal device, including a transmission actuator, a positioning bushing, and a floating mechanism; the positioning bushing and the floating mechanism are both located on the transmission actuator, and the floating mechanism is located at the rear end of the transmission actuator; the transmission positioning mechanism includes a long pull rod, a short connecting pipe, a long connecting pipe, and a conical pull rod; the long pull rod, the short connecting pipe, and the long connecting pipe are coaxially arranged, the long pull rod is located inside the short connecting pipe and the long connecting pipe, the short connecting pipe is located at the front end of the long connecting pipe and the short connecting pipe is inserted into the long connecting pipe; the rear end of the long pull rod is connected to a pipe joint, and the rear end of the long pull rod is connected to the conical pull rod through a coupling; the pipe joint is symmetrically equipped with two pairs of shift fork support shafts, rotating shift forks, and top pins; the shift fork support shafts are fixed on the pipe joint, a shift fork spring is provided between the two pairs of rotating shift forks, and the top pin is located between the conical pull rod and the rotating shift forks; the bottom of the rotating shift fork is provided with a shift pin for moving the retaining ring.

[0010] Preferably, the positioning bushing is fixedly connected to the long connecting pipe, and the end of the positioning bushing has a notch, which forms a multi-claw structure, and each claw is elastic.

[0011] Preferably, the short connecting pipe has an external thread on its outer side, and a connecting knob is threaded onto the short connecting pipe. Turning the knob allows the short connecting pipe to move axially. A compression spring is coaxially arranged inside the connecting knob. A centering sleeve and an inner expansion sleeve are provided between the short connecting pipe and the long connecting pipe. The centering sleeve is coaxially located inside the inner expansion sleeve and is in contact with the outer wall of the long connecting pipe. One end of the compression spring is connected to the inner wall of the connecting knob, and the other end is inserted between the short connecting pipe and the long connecting pipe and connected to the centering sleeve. A locking nut assembly that penetrates the long connecting pipe and fixes the inner expansion sleeve is provided on the outer side of the long connecting pipe.

[0012] Preferably, the inner diameter of the multi-claw at the end of the positioning bushing is smaller than the outer diameter of the inner expansion sleeve.

[0013] Preferably, the front end of the short connecting tube is fixedly connected to a pull rod knob by a positioning pin, the front end of the long pull rod is threadedly connected to the pull rod knob, and an anti-rotation pin is provided between the long pull rod and the short connecting tube; an intermediate support is provided in the middle of the long pull rod and between it and the long connecting tube, and three sets of anti-rotation handles are evenly arranged circumferentially on the outer wall of the short connecting tube.

[0014] Preferably, the front end of the long tie rod is engraved with dimension markings, and the dimension markings on the exposed short connecting pipe change as it moves axially along the short connecting pipe; the rear end of the long tie rod is connected to the conical tie rod via a coupling; the conical tie rod is coaxially located inside the pipe joint.

[0015] Preferably, the floating mechanism includes a spring guide post, a floating positioning sleeve, and a borescope camera; the floating positioning sleeve is fitted onto the pipe joint, and both the front end of the pipe joint and the front end of the floating positioning sleeve are provided with annular flanges, and the spring guide post is connected between the pipe joint and the annular flanges of the floating positioning sleeve.

[0016] The engine deep cavity retaining ring assembly and disassembly device of this application includes a transmission actuation mechanism, a positioning bushing, and a floating mechanism. The transmission positioning mechanism includes a long pull rod, a short connecting pipe, a long connecting pipe, and a conical pull rod. The rear end of the long pull rod is connected to a pipe joint, and the rear end of the long pull rod is connected to the conical pull rod through a coupling. Two pairs of shift fork support shafts, rotating shift forks, and top pins are symmetrically mounted on the pipe joint. The shift fork support shafts are fixed to the pipe joint, and a shift fork spring is provided between the two pairs of rotating shift forks. The top pin is located between the conical pull rod and the rotating shift fork. A shift pin for moving the retaining ring is provided at the bottom of the rotating shift fork. The positioning bushing and the outer end face of the rotor assembly cooperate to form the first positioning control. The positioning bushing and the floating positioning sleeve continue to move forward and make axial fine adjustments by connecting the knob to realize the second positioning control. The assembly accuracy is effectively improved by the dual positioning control. Attached Figure Description

[0017] To more clearly illustrate the technical solutions provided in this application, the accompanying drawings will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application.

[0018] Figure 1 is a schematic diagram of the elastic retaining ring structure in the background art;

[0019] Figure 2 is a schematic diagram of the position of the deep cavity retaining ring in the background art;

[0020] Figure 3 is an isometric view of the overall structure of this application;

[0021] Figure 4 is an isometric view of the cooperation structure of the transmission mechanism and the floating mechanism in this application;

[0022] Figure 5 is a cross-sectional view of the overall structure of this application;

[0023] Figure 6 is an enlarged view of part A in Figure 5;

[0024] Figure 7 is a schematic diagram of the use of the assembly and disassembly device of this application;

[0025] Figure 8 is a partially enlarged schematic diagram of the front end of the assembly / disassembly device of this application;

[0026] Figure 9 is a partially enlarged schematic diagram of the assembly and disassembly device of this application.

[0027] 1. Long pull rod; 2. Positioning pin; 3. Pull rod knob; 4. Anti-rotation pin; 5. Short connecting tube; 6. Anti-rotation handle; 7. Connecting knob; 8. Long connecting tube; 9. Compression spring; 10. Inner expansion sleeve; 11. Locking nut assembly; 12. Positioning bushing; 13. Intermediate support; 14. Coupling; 15. Conical pull rod; 16. Pipe joint; 17. Spring guide post; 18. Floating positioning sleeve; 19. Hole probe camera; 20. Shift fork support shaft; 21. Rotating shift fork; 22. Shift pin; 23. Shift fork spring; 24. Top pin; 25. Retaining ring; 26. Parts; 27. Inner expansion sleeve. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] An engine deep cavity retaining ring installation and removal device mainly needs to solve the following technical problems:

[0030] 1) The assembly components have a small diameter and deep cavity. Under the condition of adapting to these strict dimensions, the present invention needs to ensure that its own structure has sufficient rigidity and strength, and provide a clamping external force for the retaining ring to deform appropriately (excessive deformation will damage the retaining ring, while insufficient deformation will prevent assembly).

[0031] 2) Since the deep cavity structure exceeds the visible range, and the operating device will block more space during the insertion / removal of the retaining ring, causing a further decrease in visibility, the present invention must be able to accurately locate the target position for the operator and clearly prompt the operator on the timing of controlling the contraction / expansion of the retaining ring to achieve insertion / removal. After completing all operations, it is also necessary to help the operator confirm that the retaining ring is installed in place.

[0032] 3) Before passing through the deep cavity to reach the target position, the retaining ring should be reliably clamped to prevent accidental detachment, and the clamping structure should be as simple as possible to ensure operability.

[0033] As shown in Figures 3-5, the device includes a transmission actuator, a positioning bushing 12, and a floating mechanism. Both the positioning bushing 12 and the floating mechanism are located on the transmission actuator, with the floating mechanism situated at the rear end of the transmission actuator.

[0034] It should be noted that in this application, the front end is the end away from the retaining ring 25, and the rear end is the end close to the retaining ring 25.

[0035] The transmission positioning mechanism includes a long pull rod 1, a short connecting tube 5, a long connecting tube 8, and a conical pull rod 15. The long pull rod 1, short connecting tube 5, and long connecting tube 8 are coaxially arranged, with the long pull rod 1 located inside the short connecting tube 5 and the long connecting tube 8.

[0036] The short connecting tube 5 is located at the front end of the long connecting tube 8 and the short connecting tube 5 is inserted into the long connecting tube 8.

[0037] The short connecting pipe 5 has an external thread on its outer side, and a connecting knob 7 is threaded onto the short connecting pipe 5. Turning the knob allows the short connecting pipe 5 to move axially. A compression spring 9 is coaxially arranged inside the connecting knob 7. A centering sleeve 10 and an inner expansion sleeve 27 are provided between the short connecting pipe 5 and the long connecting pipe 8. The centering sleeve 10 is coaxially located inside the inner expansion sleeve 27 and is in contact with the outer wall of the long connecting pipe 8. One end of the compression spring 9 is connected to the inner wall of the connecting knob 7, and the other end is inserted between the short connecting pipe 5 and the long connecting pipe 8 and connected to the centering sleeve 10, so as to achieve mutual stable support between the short connecting pipe 5 and the long connecting pipe 8. A locking nut assembly 11 is provided on the outer side of the long connecting pipe 8, which passes through the long connecting pipe 8 and fixes the inner expansion sleeve 27. The centering sleeve 10 and the locking nut assembly 11 are detachably connected.

[0038] When the connecting knob 7 moves axially along the thread at the front end of the inner expansion sleeve 27, the short connecting pipe 5 and the long connecting pipe 8 will move together with the connecting knob 7 under the support and centering conditions formed by the linear bearings at both ends of the inner cavity of the inner expansion sleeve 27, so that the pipe joint 16 on the long connecting pipe 8 and the pin 22 installed on the pipe joint 16 and other components will axially approach or move away from the retaining ring 25.

[0039] The front end of the short connecting tube 5 is fixedly connected to the pull rod knob 3 by the positioning pin 2. The front end of the long pull rod 1 is threadedly connected to the pull rod knob 3. The pull rod knob 3 is restricted by the positioning pin 2 to rotate only along the axis of the short connecting tube 5. The long pull rod 1 and the short connecting tube 5 are provided with an anti-rotation pin 4 to achieve relative anti-rotation. Therefore, when the pull rod knob 3 is rotated, the pull rod assembly will move axially relative to the connecting tube assembly.

[0040] The long tie rod 1 has an intermediate support 13 between its middle section and the long connecting pipe 8. The rear end of the long tie rod 1 is connected to a pipe joint 16. The long tie rod 1 and the long connecting rod are supported and centered through the cooperation of the intermediate support 13 and the pipe joint 16.

[0041] The long pull rod 1 has dimensional markings engraved on its front end. As it moves axially along the short connecting tube 5, the dimensional markings on the exposed short connecting tube 5 change accordingly. Different dimensional markings can provide the operator with a basis for judging the assembly and use status of the device.

[0042] For ease of operation, three sets of anti-rotation handles 6 are evenly arranged circumferentially on the outer wall of the short connecting pipe 5.

[0043] The rear end of the long pull rod 1 is connected to the conical pull rod 15 via a coupling 14. The conical pull rod 15 is coaxially located inside the pipe joint 16. Referring to Figure 6, the pipe joint 16 is symmetrically equipped with two pairs of shift forks 21, support shafts 20, rotating shift forks 21, and top pins 24. The support shafts 20 of the shift forks 21 are fixed to the pipe joint 16, a shift fork spring 23 is provided between the two pairs of rotating shift forks 21, and the top pin 24 is located between the conical pull rod and the rotating shift forks 21. The bottom of the rotating shift fork 21 is provided with a shift pin 22 for actuating the retaining ring 25.

[0044] From the perspectives of maintainability, production, and assembly processes, a long tie rod 1 and a tapered tie rod 15 are designed to cooperate with the coupling 14 to form a tie rod assembly. When the tie rod assembly moves axially forward, the top pin 24 extends radially under the action of the tapered surface of the tapered tie rod 15 and pushes against the arc surface of the rotating fork 21, pushing the rotating fork 21 to rotate around the axis of the fork 21 support shaft 20. The pin 22 on it moves accordingly, and the pins 22 on both sides gradually move closer together. When the tie rod assembly moves axially backward, the fork spring 23 pushes the rotating fork 21 outward to rotate around the axis of the fork 21 support shaft 20. The top pin 24 then retracts radially along the tapered surface of the tapered tie rod 15, and the pins 22 on both sides gradually move away from each other.

[0045] The positioning sleeve 12 and the floating mechanism are responsible for the axial and radial positioning and support of the entire device on the engine. The positioning sleeve 12 is fixedly connected to the long connecting pipe 8. The end of the positioning sleeve 12 has a notch and is in the form of multiple claws. Each claw is elastic, giving the entire structure a certain degree of elasticity. The inner diameter of the multiple claws at the end of the positioning sleeve 12 is smaller than the outer diameter of the inner expansion sleeve 27 to ensure the elasticity of the positioning sleeve 12. In the free state, each claw expands, and its diameter is smaller than the diameter of the engine cavity it is mating with. In the working state, because the outer diameter of the conical surface of the inner expansion sleeve 27 is larger than the inner diameter of the multiple claws at the end of the positioning sleeve 12, each claw will be subjected to the external support force of the conical surface of the inner expansion sleeve 27. After expanding, it will be firmly supported in the inner cavity of the engine rotor assembly, realizing the first centering and support of the entire device on the engine.

[0046] The floating mechanism includes a spring guide post 17, a floating positioning sleeve 18, and a borescope camera 19. The floating positioning sleeve 18 is fitted onto the pipe joint 16. Both the front end of the pipe joint 16 and the front end of the floating positioning sleeve 18 have annular flanges. The spring guide post 17 connects the pipe joint 16 and the annular flanges of the floating positioning sleeve 18. The floating positioning sleeve 18 abuts against the part 26 equipped with the retaining ring 25. Before the device is installed in place, the floating positioning sleeve 18 is pushed forward by the spring on the spring guide post 17, extending forward to engage with the part 26, providing guidance and support for the installation of the device on the engine. Since the front end of the floating positioning sleeve 18 reaches the part 26, as the retaining ring 25 is further away from or closer to the retaining ring 25, the spring on the spring guide post 17 will shorten or lengthen to adapt to the distance change and continue to play a guiding and supporting role. When the device is installed in place and the retaining ring 25 installation operation begins, the floating positioning sleeve 18 forms the second centering and support for the entire device on the engine.

[0047] As shown in Figures 7-9, during the installation of the retaining ring: the retaining ring 25 is installed inside the floating positioning sleeve 18 and kept in a tight position. Simultaneously, the pin 22 is inserted into the clamping hole of the retaining ring 25. After confirming that the multi-jaw structure of the positioning sleeve 12 is in a free state, the entire device is first inserted into the rotor assembly. During insertion, the positioning sleeve 12 and the floating positioning sleeve 18 provide guidance and centering. When the positioning sleeve 12 is axially pressed against the end face of the rotor assembly, the locking nut assembly 11 is rotated to move the inner expansion sleeve 27 axially until the multi-jaw structure of the positioning sleeve 12 is fully expanded, thus completing the installation. Place the positioning support; then rotate the connecting knob 7 to move the connecting tube assembly to the end face of the floating positioning sleeve 18 against the part 26. Next, rotate the pull rod knob 3 to move the two pins 22 closer together. Check the dimension markings on the front of the pull rod assembly to retract the retaining ring 25 out of the simulation groove. Continue rotating the connecting knob 7 to move the push head assembly to the axial position of the retaining ring 25 in the mounting groove of the part 26. Rotate the pull rod knob 3 to move the two pins 22 away from each other, expanding the retaining ring 25 until it is in place. Confirm the installation by checking the dimension markings on the front of the pull rod assembly in conjunction with the borehole probe image. Rotate the locking nut assembly 11 to release the tension of the positioning sleeve 12 on the rotor assembly, remove the entire device, and complete the installation of the retaining ring 25.

[0048] When disassembling the retaining ring: After confirming that the multi-claw structure of the positioning sleeve 12 is in a free state, first insert the entire device into the rotor assembly. During the insertion process, the positioning sleeve 12 and the floating positioning sleeve 18 will provide guidance and centering. After the positioning sleeve 12 is axially pressed against the end face of the rotor assembly, rotate the locking nut assembly 11 to move the inner expansion sleeve 27 axially, and the multi-claw of the positioning sleeve 12 will fully expand, achieving device positioning and support. Then, rotate the connecting knob 7 to move the connecting tube assembly to the end face of the floating positioning sleeve 18 to abut the part 26. Then, rotate the pull rod knob 3 and move the two pins 22 by checking the dimension markings on the front end of the pull rod assembly. Move the connector assembly to the position where it can be inserted into the clamp hole of the retaining ring 25, and simultaneously rotate the connecting tube assembly to ensure that it is circumferentially aligned with the clamp hole of the retaining ring 25. Continue to rotate the connecting knob 7, and move the push head assembly to the axial position where the retaining ring 25 is located in the mounting groove of part 26. Insert the pin 22 into the clamp hole of the retaining ring 25. Rotate the pull rod knob 3 to move the two pins 22 closer together, shrinking the retaining ring 25 to the position marked on the front end of the pull rod assembly. Then rotate the connecting knob 7 to make the pin 22, along with the shrunken retaining ring 25, retract to the simulated axial position of the floating positioning sleeve 18. Rotate the pull rod knob 3 to move the two pins 22 away from each other, expanding the retaining ring 25 until it enters the simulated groove. Rotate the locking nut assembly 11 to release the tension fixation of the positioning sleeve 12 on the rotor assembly, remove the entire device, and remove the retaining ring 25 from the floating positioning sleeve 18 to complete the disassembly operation.

[0049] The advantages of this application are as follows: 1) Due to factors such as machining errors and deformation of the parts, the axial dimension from the outer cavity of the rotor assembly to the end of part 26 will vary to a certain extent. Therefore, the device implements dual positioning control: First, the end face of the positioning sleeve 12 is fitted with the outer end face of the rotor assembly to perform basic axial positioning of the device. Since the floating positioning sleeve 18 is clamped between the device and the entire device, it can adaptively adjust the axial distance from the aforementioned fitting end face to part 26. This is the first positioning control. On this basis, by rotating the connecting knob 7, the head assembly is driven to continue moving forward relative to the positioning sleeve 12 and the floating positioning sleeve 18 to perform axial fine adjustment, thereby achieving the final axial position adjustment of the top pin 24 inserting into the clamp hole of the retaining ring 25. This is the second positioning control. The assembly accuracy is effectively improved through dual positioning control.

[0050] 2) By rationally designing the relevant moving fit dimensions of the cone head tie rod 15, the top pin 24, and the pipe joint 16, the radial movement stroke of the top pin 24 relative to the head can be accurately controlled, and the movement trajectory of the push pin 22 can be limited. This will control the shrinkage and expansion deformation of the retaining ring 25 within the required size range and prevent the retaining ring 25 from over-expanding or under-shrinking.

[0051] 3) The device uses multiple threaded transmission mechanisms in combination to enable operators to remotely operate the retaining ring 25. Only a small torque is required to provide sufficient clamping for the deformation of the retaining ring 25. In addition, the deformation can be infinitely adjusted and locked in any state, reducing the labor intensity of operators.

[0052] 4) In order to enable the operator to accurately and quickly locate the position of the retaining ring 25 and perform appropriate deformation operations, the design process of the device is carried out by calculating the dimensional chain between the engine and the device to determine the relationship between different operating states and the movement dimensions of the device components, and the operating status prompts are engraved at different size positions on the device surface for the operator to obtain relevant information.

[0053] 5) Equipped with a borescope camera device to visualize the assembly and disassembly operation: When installing the retaining ring 25, in addition to confirming the position of the installation slot and the installation of the retaining ring 25 through the mechanical structure design and markings of the device itself, the operator can also use the borescope to check and inspect, so as to further ensure the reliability and quality of the assembly; when disassembling the retaining ring 25, the operator can use the equipped borescope device to quickly confirm the position of the retaining ring 25 clamp hole and carry out the disassembly operation of the retaining ring 25.

[0054] 6) To ensure reliable clamping of the retaining ring 25, the floating positioning sleeve 18 is equipped with a simulated groove structure. Before the device is installed in place, the retaining ring 25 is stored in the simulated groove. Since the size of the groove is smaller than the outer diameter of the retaining ring 25 in its free state, the elastic deformation force of the retaining ring 25 will keep it tightly attached to the surface of the simulated groove, preventing accidental detachment. When the retaining ring 25 is needed, it can be retracted and deformed using a pull fork and removed from the simulated groove.

[0055] Finally, it should be noted that the accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other.

[0056] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for installing and removing a deep cavity retaining ring for an engine, characterized in that: It includes a transmission actuator, a positioning bushing (12), and a floating mechanism; the positioning bushing (12) and the floating mechanism are both located on the transmission actuator, and the floating mechanism is located at the rear end of the transmission actuator; the transmission positioning mechanism includes a long pull rod (1), a short connecting pipe (5), a long connecting pipe (8), and a conical pull rod (15); the long pull rod (1), the short connecting pipe (5), and the long connecting pipe (8) are coaxially arranged, the long pull rod (1) is located inside the short connecting pipe (5) and the long connecting pipe (8), the short connecting pipe (5) is located at the front end of the long connecting pipe (8) and the short connecting pipe (5) is inserted into the long connecting pipe (8); the rear end of the long pull rod (1) is provided with a pipe joint (16), the long pull rod (1) 1) The rear end is connected to the conical tie rod (15) via a coupling (14). The pipe joint (16) is symmetrically equipped with two shift fork support shafts (20), a rotating shift fork (21), and a top pin (24). The shift fork support shaft (20) is fixed on the pipe joint (16). A shift fork spring (23) is provided between the two rotating shift forks (21). The top pin (24) is located between the conical tie rod and the rotating shift fork (21). The bottom of the rotating shift fork (21) is provided with a shift pin (22) for moving the retaining ring (25). The positioning bushing (12) is fixedly connected to the long connecting pipe (8). The end of the positioning bushing (12) has a notch, which forms a multi-claw structure. Each claw has Elasticity; the short connecting tube (5) is provided with an external thread on the outside, and a connecting knob (7) is threaded onto the short connecting tube (5). Turning the knob can move along the axial direction of the short connecting tube (5). A compression spring (9) is coaxially provided inside the connecting knob (7). A centering sleeve (10) and an inner expansion sleeve (27) are provided on the outside of the long connecting tube (8). The centering sleeve (10) is coaxially provided on the inner side of the inner expansion sleeve (27) and is in contact with the outer wall of the long connecting tube (8). One end of the compression spring (9) is connected to the inner wall of the connecting knob (7), and the other end is inserted between the short connecting tube (5) and the long connecting tube (8) and connected to the centering sleeve (10). The long connecting tube (8) is provided with a through-tube and inner expansion sleeve on the outside. The locking nut assembly (11) is fixed by the expansion sleeve (27); when the connecting knob (7) moves axially along the threaded front end of the inner expansion sleeve (27), the short connecting pipe (5) and the long connecting pipe (8) will move together with the connecting knob (7) under the support and centering conditions formed by the linear bearings at both ends of the inner cavity of the inner expansion sleeve (27); the floating mechanism includes a spring guide post (17), a floating positioning sleeve (18) and a borehole camera (19); the floating positioning sleeve (18) is sleeved on the pipe joint (16), and the front end of the pipe joint (16) and the front end of the floating positioning sleeve (18) are both provided with annular flanges, and the spring guide post (17) is connected between the annular flanges of the pipe joint (16) and the floating positioning sleeve (18).

2. The engine deep cavity retaining ring installation and removal device as described in claim 1, characterized in that: The inner diameter of the multi-claw at the end of the positioning bushing (12) is smaller than the outer diameter of the inner expansion sleeve (27).

3. The engine deep cavity retaining ring installation and removal device as described in claim 1, characterized in that: The front end of the short connecting tube (5) is fixedly connected to the pull rod knob (3) by the positioning pin (2). The front end of the long pull rod (1) is threadedly connected to the pull rod knob (3). The long pull rod (1) is also provided with an anti-rotation pin (4) between it and the short connecting tube (5). The middle part of the long pull rod (1) is provided with an intermediate support (13) between it and the long connecting tube (8). Three sets of anti-rotation handles (6) are evenly arranged along the circumference on the outer wall of the short connecting tube (5).

4. The engine deep cavity retaining ring installation and removal device as described in claim 1, characterized in that: The front end of the long pull rod (1) is marked with a size marking. When it moves along the axial direction of the short connecting pipe (5), the size marking of the exposed short connecting pipe (5) changes accordingly. The rear end of the long pull rod (1) is connected to the conical pull rod (15) through a coupling (14). The conical pull rod (15) is coaxially located inside the pipe joint (16).

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