All-round rotating mechanism with locking and unlocking functions

Abstract

The utility model discloses a full-circle rotating mechanism with locking and releasing, which comprises an inner ring, and a locking and releasing ring, an outer ring and a limit retainer ring which are sequentially and coaxially sleeved outside the inner ring, two axial ends of the outer ring respectively abut against the locking and releasing ring and the limit retainer ring, a spiral groove matched with the locking and releasing ring is arranged on the inner ring, and the locking and releasing ring is sleeved on the outer ring. The locking and releasing ring rotates along the spiral line groove to form axial movement, a plurality of ball plungers are distributed on the outer ring in the circumferential direction, and a plurality of pits used for abutting against the steel ball ends of the ball plungers are distributed in the limiting check ring in the circumferential direction. The spiral line meshing transmission mode of the locking and releasing ring is adopted, axial movement can be generated only through rotation action, stepless switching of locking and unlocking is achieved in the axial movement process in cooperation with the ball head plunger and the pit, external tools are not needed, the operation difficulty and efficiency are greatly improved, and the locking and unlocking device can be suitable for narrow space and emergency working conditions.

Description

Technical Field

[0001] This utility model belongs to the field of rotary locking structure technology, and relates to a full-circumference rotary mechanism with locking and releasing function. Background Technology

[0002] Lockable / unlockable rotary mechanisms are widely used in fields such as medical and industrial applications, especially in connecting joints of supports, robotic arms, etc.

[0003] Traditional lockable / unlockable rotary mechanisms generally include mechanical clamping locking mechanisms, indexing plate positioning systems, and elastic preload rotary mechanisms. Among them, low locking / unlocking efficiency and the attenuation of positioning accuracy and locking effect over long-term use are common problems. For example, mechanical clamping and indexing plate locking mechanisms have many locking components, requiring tools or external actuators, resulting in excessively long mode switching times and failing to meet the real-time requirements of frequent working condition switching. Similarly, indexing plate mechanisms are limited by recessed positioning, and locking is maintained by spring force. Likewise, elastic preload rotary mechanisms rely on wave plate spring assemblies or wave springs, and locking is maintained by the friction of friction plates. Over long-term use, all components, including recesses, springs, and friction plates, will wear down, leading to a rapid decrease in positioning accuracy and locking torque. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, this utility model provides a full-circumference rotation mechanism with locking and releasing mechanism.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A locking and releasing full-circumferential rotating mechanism includes an inner ring and a locking ring, an outer ring, and a limiting retaining ring sequentially and coaxially sleeved outside the inner ring. The two ends of the outer ring in the axial direction abut against the locking ring and the limiting retaining ring, respectively. The inner ring is provided with a helical groove for cooperating with the locking ring. The locking ring undergoes axial displacement during rotation along the helical groove. The outer ring is provided with a plurality of ball-head plungers distributed circumferentially. The limiting retaining ring is provided with a plurality of recesses distributed circumferentially for abutting against the ball ends of the ball-head plungers.

[0007] Furthermore, the spiral grooves are distributed along the circumference of the inner ring, and the inner circumference of the locking and releasing ring is provided with a spiral boss for axially abutting against the spiral grooves.

[0008] Furthermore, the pitch of the spiral groove is 5-12mm, and the helix angle is 10°-20°.

[0009] Furthermore, the plurality of ball-head plungers and the plurality of recesses are arranged in a ring array centered on the axis of the inner ring.

[0010] Furthermore, the number of ball-head plungers is set to 6-12, and the pits are distributed with adjacent intervals of less than 10°.

[0011] Furthermore, the ball plunger includes a housing, a steel ball, and a spring. The steel ball is disposed in the opening of the housing and is used to abut against the recess. The spring is disposed inside the housing and abuts against the spring.

[0012] Furthermore, the outer ring is provided with a mounting hole, and the outer shell is threadedly connected to the mounting hole.

[0013] Furthermore, the outer periphery of the inner ring is provided with a plurality of positioning grooves along the circumferential direction, and the inner periphery of the limiting ring is provided with a limiting boss protruding therefrom. The positioning grooves are connected to one axial end of the inner ring to form an opening for the limiting boss to enter axially.

[0014] Furthermore, it also includes a shaft retaining ring, wherein the outer circumference of the inner ring is provided with a mounting groove for engaging and fixing the shaft retaining ring, and the shaft retaining ring abuts against the limiting retaining ring.

[0015] Furthermore, the spring inside the ball plunger is made of 60Si2MnA material with a hardness of HRC48-52; the radius of curvature of the recess is 1.02-1.05 times the radius of the steel ball of the ball plunger, and the depth of the recess is 0.5-1.2mm; the surfaces of the inner ring and the outer ring are both treated with micro-arc oxidation; the inner ring and the locking ring are both made of 20CrMnTi carburized and quenched; the limiting ring is made of 9Cr18MoV stainless steel and cryogenically treated; and a flange interface is also provided on the outer ring.

[0016] In summary, the advantages of this utility model are as follows:

[0017] This invention employs a helical meshing transmission method with a locking and releasing ring, which generates shaft movement with only rotation. In conjunction with the ball plunger and the recess, it achieves stepless switching between locking and unlocking during shaft movement. No external tools are required, greatly improving the ease of operation and efficiency. It is suitable for confined spaces and emergency situations.

[0018] The inner and outer rings and the limiting retaining ring are coaxially arranged, and with the ball head plunger and the full circumferential distribution of the recesses, the outer ring can rotate freely along the entire circumference of the inner ring in the unlocked state. This breaks through the angle dispersion limitation of the traditional indexing plate mechanism. Furthermore, by reasonably setting the number and distribution of the recesses, ultra-high positioning accuracy can be achieved, and the device can stop at any angle.

[0019] By utilizing the high elasticity of the ball plunger, a stable low preload decay is provided. Combined with the action of the ball plunger's steel ball and the groove, rolling friction is formed instead of sliding friction, which greatly reduces wear and effectively ensures the locking positioning accuracy and locking force effect under long-term use cycles. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the full-circumference rotation mechanism of this utility model.

[0021] Figure 2 for Figure 1 A schematic diagram of the explosion structure.

[0022] Figure 3 This is a schematic diagram of the inner ring structure.

[0023] Figure 4 This is a schematic diagram of the outer ring structure.

[0024] Figure 5 This is a schematic diagram of the limit retaining ring.

[0025] Figure 6 This is a schematic diagram of the structure of a ball-head plunger.

[0026] Figure 7 This is a schematic diagram of the mating structure of the ball-head plunger and the limiting retaining ring.

[0027] Figure 8 This is a cross-sectional view of the structure in the unlocked state.

[0028] Figure 9 This is a schematic diagram of the cross-sectional structure in the locked state.

[0029] The markings in the diagram are as follows: 101, Inner ring; 101a, Helical groove; 101b, Positioning groove; 101c, Mounting groove; 102, Locking ring; 102a, Helical boss; 103, Outer ring; 103a, Mounting hole; 103b, Retaining ring groove; 104, Ball plunger; 104a, Steel ball; 104b, Spring; 104c, Housing; 105, Limiting retaining ring; 105a, Recess; 105b, Limiting boss; 106, Shaft retaining ring. Detailed Implementation

[0030] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0031] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0032] In this embodiment of the invention, all directional indicators (such as up, down, left, right, front, back, horizontal, vertical, etc.) are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0033] Due to installation errors and other reasons, the parallel relationship referred to in the embodiments of this utility model may actually be an approximate parallel relationship, and the perpendicular relationship may actually be an approximate perpendicular relationship.

[0034] This embodiment provides a full-circumferential rotation mechanism with locking and releasing, including an inner ring 101, an outer ring 103, a locking and releasing ring 102, a ball-head plunger 104, a limiting retaining ring 105, and a shaft retaining ring 106. It can be used in industrial automation, medical equipment, aerospace and other fields to provide fast locking and releasing that is compatible with full-circumferential continuous rotation and high-precision positioning.

[0035] Specifically, refer to Figure 1 and Figure 2 Both the inner ring 101 and the outer ring 103 are circular ring structures. The outer ring 103 is fitted around the outer circumference of the inner ring 101. Preferably, the inner circumference of the outer ring 103 and the outer circumference of the inner ring 101 form a clearance fit, so that the outer ring 103 can rotate smoothly in the circumferential direction relative to the inner ring 101.

[0036] The inner ring 101 has a front end and a rear end in the axial direction, with the locking and releasing ring 102 located at the front end and the limiting ring 105 located at the rear end. The locking and releasing ring 102 and the limiting ring 105 cooperate with the front end and the rear end of the outer ring 103 in the axial direction, respectively, to control the axial position of the outer ring 103 relative to the inner ring 101. The concentric nested layout of the inner ring 101, the locking and releasing ring 102, and the outer ring 103 has a total axial thickness of ≤25mm and a nesting gap controlled between 0.1-0.3mm, which compresses the axial space by 55% and has a self-centering function.

[0037] Reference Figure 2 and Figure 3The inner ring 101 has a front end ring that protrudes radially around its entire circumference. A locking ring 102 is positioned between the front end ring and the outer ring 103, such that both axial ends of the locking ring 102 abut against the front end ring and the outer ring 103 respectively. Preferably, the inner circumference of the locking ring 102 and the outer circumference of the inner ring 101 form a clearance fit, allowing the locking ring 102 to rotate smoothly circumferentially relative to the inner ring 101. A spiral is provided on the end face of the front end ring that abuts against the locking ring 102. The groove 101a has a spiral surface distributed along the circumference of the front end ring. The inner circumference of the locking ring 102 is provided with a spiral boss 102a. The spiral boss 102a abuts against the spiral surface of the spiral groove 101a in the axial direction of the inner ring 101. When the spiral boss 102a and the spiral surface are in abutting state, the rotation of the locking ring 102 relative to the inner ring 101 will synchronously drive the axial displacement of the locking ring 102 relative to the inner ring 101.

[0038] The spiral groove 101a can be provided with one or more segments. The spiral grooves 101a are distributed in an array in the circumferential direction of the front end ring. A stop block is provided at the beginning or end of the spiral groove 101a to block the spiral boss 102a in the circumferential direction, thereby setting the rotation angle range of the locking and releasing ring 102. The rotation angle range of the locking and releasing ring 102 is ±30°-120°, preferably ±60°.

[0039] Preferably, the pitch of the spiral groove 101a is 5-12mm. For example, when the pitch is 8mm, the axial displacement ΔL = pitch × rotation angle / 360°. The maximum axial displacement is 2.5mm under the unidirectional rotation of the locking ring 102. The cross-sectional shape of the spiral groove 101a is trapezoidal or arc-shaped, the groove depth is 1.5-3mm, the helix angle is 10-20 degrees, the groove width tolerance fit grade is H7 / g6, and the helix angle is less than arctan (coefficient of friction between steel and steel), so as to achieve a self-locking effect and there is no risk of reverse loosening in the locked state.

[0040] Reference Figure 2 and Figure 5 A limiting ring 105 is disposed on the outer periphery of the inner ring 101 and forms a fixed connection with the inner ring 101. Multiple recesses 105a are provided on the end face of the limiting ring 105 facing the outer ring 103. Multiple ball-head plungers 104 are provided on the end face of the outer ring 103 facing the limiting ring 105. The ball-head plungers 104 form a fixed connection with the outer ring 103. The steel balls 104a of the ball-head plungers 104 abut against the end face of the limiting ring 105. By arranging the multiple ball-head plungers 104 and multiple recesses 105a in a circular array centered on the axis of the inner ring 101, and with the array diameter of the ball-head plungers 104 being the same as the array diameter of the recesses 105a, during the rotation of the outer ring 103, a reference... Figure 7The steel ball 104a of the ball plunger 104 moves along the distribution trajectory of the pit 105a and generates a rebound action to press into or out of any pit 105a. The evenly distributed multiple ball plungers 104 and pits 105a form a multi-contact pressure distribution, which can withstand axial impact load ≥500N, improving locking stability and anti-eccentric load capability.

[0041] Reference Figure 6 The ball plunger 104 includes a housing 104c, a steel ball 104a, and a spring 104b. The spring 104b is made of 60Si2MnA material with a hardness of HRC48-52 and a stiffness of 3-8N / mm. It can have an adjustable preload of 10-30N, and the preload decay rate after 10^4 locking cycles is <5%. The maintenance-free period is up to 5000 hours. The housing 104c is made of stainless steel and has external threads.

[0042] The pits 105a are distributed in a ring array, and the number of them should be greater than 36, that is, the interval between adjacent pits 105a is less than 10°. Preferably, 72 pits are used with an adjacent interval of 5°. The radius of curvature of a single pit 105a is the radius of the steel ball 104a multiplied by 1.02 to 1.05, making it slightly larger than the radius of the steel ball 104a. The depth is set to 0.5-1.2mm to ensure that the rolling friction between the steel ball 104a and the pit 105a replaces the sliding friction.

[0043] Reference Figure 4 An annular groove 103b is provided on the end face of the outer ring 103 for embedding the retaining ring 105, which is used to limit the axial positioning of the retaining ring 105, control the nesting gap, and improve the fit accuracy between the structures.

[0044] The end face of the retaining ring groove 103b is provided with multiple mounting holes 103a for mounting and fixing the ball plunger 104. It is recommended that the number of mounting holes 103a corresponding to the ball plunger 104 be set to 6-12, preferably 8. The depth of the mounting holes 103a is preferably 6mm.

[0045] The inner wall of the mounting hole 103a is provided with an internal thread. The ball-head plunger 104 is installed into the mounting hole 103a through the threaded connection, and the axial position of the ball-head plunger 104 relative to the outer ring 103 can be adjusted by controlling the screwing depth.

[0046] It should be added that the contact surfaces of the inner ring 101 and outer ring 103 are treated with micro-arc oxidation, with a film thickness of 20-30μm and a surface hardness ≥HV800. This allows them to withstand a wide temperature range of -40℃ to 120℃, preventing low-temperature brittleness and high-temperature oxidation. They also exhibit salt spray corrosion resistance >500 hours, meeting the requirements of corrosive environments such as marine and chemical plants. The inner ring 101 and locking / releasing ring 102 are made of 20CrMnTi carburized and quenched steel, with a surface hardness of HRC58-62 and a core hardness of HRC30-35. The limiting retaining ring 105 is made of 9Cr18MoV stainless steel, and after cryogenic treatment (-196℃×2h), its dimensional stability is ≤0.005mm / 100℃.

[0047] To ensure reliable connection between the retaining ring 105 and the inner ring 101, and to provide a detachable function, a positioning groove 101b is provided at the rear end of the inner ring 101. The positioning groove 101b connects to the rear end face of the inner ring 101 to form an opening. A retaining boss 105b protrudes from the inner circumference of the retaining ring 105 to mate with the positioning groove 101b. The retaining ring 105 moves coaxially with the inner ring 101, allowing the retaining boss 105b to enter the positioning groove 101b through the opening. Inside, the positioning groove 101b limits the positioning boss 105b to achieve radial rotational limitation between the limiting retaining ring 105 and the inner ring 101; the outer circumference of the rear end of the inner ring 101 is also provided with a mounting groove 101c along the circumferential direction, and the shaft retaining ring 106 is embedded in the mounting groove 101c and abuts against the rear end of the limiting retaining ring 105 to provide axial limitation for the limiting retaining ring 105. Thus, the limiting retaining ring 105 and the inner ring 101 are fixedly installed through radial rotational limitation and axial limitation.

[0048] The number of positioning grooves 101b is set to multiple, and they are distributed in a ring array on the outer periphery of the inner ring 101. The limiting bosses 105b on the inner periphery of the limiting ring 105 are adapted to be multiple in a ring array to ensure installation strength.

[0049] In practical applications, the two components on the device that need to rotate relative to each other are connected to the inner ring 101 and the outer ring 103 respectively. Preferably, the inner circumference of the inner ring 101 and the outer circumference of the outer ring 103 are respectively connected to the components and fixed by screws or other means. In some embodiments, a flange interface may also be added to the outer ring 103 to support the quick assembly and disassembly of the six-axis robot end effector.

[0050] By rotating the locking ring 102, it moves along the spiral groove 101a, forming an axial positional advance and retreat. When the locking ring 102 rotates close to one end of the spiral groove 101a, the locking ring 102 and the outer ring 103 advance towards the limiting retaining ring 105, causing the ball plunger 104 to compress, increasing the elastic force of the internal spring 104b. The steel ball 104a is pressed into the recess 105a with a set pressure to form friction, preventing the outer ring 103 from rotating relative to the inner ring 101, thus creating a locking effect. (Refer to...) Figure 9 As shown, preferably, when the spring 104b is compressed to its limit position, the eight ball-head plungers 104 can generate a total locking force F of 8 × 15 N = 120 N, thereby generating a locking torque M of F × r = 120 N × 0.1 m = 12 N·m, where r is the radius of action.

[0051] When the locking and releasing ring 102 rotates to near the other end of the spiral groove 101a, the locking and releasing ring 102 and the outer ring 103 retract away from the limiting retaining ring 105, causing the spring force of the spring 104b inside the ball plunger 104 to relax. The contact pressure between the steel ball 104a and the recess 105a drops below 2N, so that in this state, the rolling friction coefficient μ of the steel ball 104a relative to the limiting retaining ring 105 is ≤0.08, and the rotational resistance torque T is less than 8×2N×0.08×0.1m=0.128N·m. Thus, the outer ring 103 can rotate relative to the inner ring 101, achieving the unlocking effect. (Refer to...) Figure 8 As shown.

[0052] By switching between locking and unlocking, the inner ring 101 and the outer ring 103 can be positioned at any angle throughout the entire circumference. In the unlocked state, when the outer ring 103 rotates, the steel ball 104a rolls between the recesses 105a, and the collision of the steel ball 104a generates slight tactile feedback to prompt the user on the direction and angle of rotation. When a fixed angle is required, the outer ring 103 and the inner ring 101 are rotated to the target angle position and then the locking state is switched. The steel ball 104a is embedded in the corresponding recess 105a, achieving a repeatability positioning accuracy of ±0.5°.

[0053] In other embodiments, the number of rows of recesses 105a can be adjusted to 360, so that the interval between adjacent recesses 105a is 1°, thereby achieving a positioning accuracy of ±0.1° and a locking torque greater than 15 N·m. This can be applied to the rotating support of a CT scanner to achieve high-precision adjustment.

[0054] In some embodiments, the spiral groove 101a can adopt a variable pitch design, so that the initial pitch of 6mm and the final pitch of 3mm are connected. When the locking and releasing ring 102 rotates along the initial section, the axial displacement distance is large, which is used to achieve fast locking. When the locking and releasing ring 102 rotates along the final section, the axial displacement distance is small, which is used to achieve fine locking force adjustment. The locking process has both fast response and high-precision control, which is suitable for precision instruments with graded locking, such as optical platform adjustment mechanisms. Furthermore, a pressure sensor is embedded at the end of the spiral boss 102a of the locking and releasing ring 102 to obtain the magnitude of the axial locking force. By adding components such as a vibration motor and connecting them to the pressure sensor, a tactile vibration reminder can be triggered when the locking force reaches a set threshold.

[0055] In some embodiments, the rotation of the locking and releasing ring 102 can be controlled by an integrated micro stepper motor. The locking and releasing ring 102 is equipped with an external gear ring, and the motor shaft meshes with the external gear ring through a worm gear. The control signal receiving end supports RS485 or CAN bus communication. Furthermore, a rotary encoder is added to the outer ring 103 to provide real-time feedback on the rotation angle of the outer ring 103, intelligently positioning the rotation of the locking and releasing ring 102, supporting programmed control of the locking / unlocking state, and is suitable for unmanned production lines or high-risk environments, such as robotic arms in nuclear power plants.

[0056] In some embodiments, the ball plunger 104 can be configured as an adjustable preload structure. Specifically, a threaded adjustment knob is added to the housing 104c. By rotating the adjustment knob, the compression of the spring 104b is adjusted, corresponding to an adjustable preload range of ±5N. The knob may have scale markings corresponding to the change in preload, and a locking nut is provided to prevent the knob from loosening. Furthermore, the recess 105a can be set with alternating deep and shallow recesses. A deep recess 105a with a depth of 1.2mm corresponds to a high locking position, and a shallow recess 105a with a depth of 0.6mm corresponds to a low locking position. The angle between the deep recess 105a and the shallow recess 105a is preferably 10°, so that the locking torque can be adjusted in stages within the range of 5-30N·m to meet the needs of multiple scenarios from light load (such as camera gimbals) to heavy load (such as engineering machinery turntables).

[0057] In some embodiments, the inner ring 101 and the locking / releasing ring 102 may be made of Inconel 718 high-temperature alloy, with a 50μm thick Al2O3 ceramic coating sprayed on the surface. The spring 104b is made of Haynes 230 nickel-based alloy, which increases the temperature resistance to 800°C. Radial heat dissipation fins are added to the outer surface of the outer ring 103. The fins are made of copper-tungsten alloy and have graphite lubrication grooves embedded in the spiral grooves for continuous release of solid lubricant. This extends the operating temperature range to -196°C to 800°C and can withstand more than 10^4 thermal cycles, making it suitable for aerospace engine vector nozzle adjustment mechanisms.

[0058] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort should fall within the protection scope of this utility model.

Claims

1. A full rotation mechanism with lock release, characterized by, The device comprises an inner ring, a lock release ring, an outer ring and a limiting ring, the two ends of the outer ring in the axial direction are respectively in contact with the lock release ring and the limiting ring, a helical groove is arranged on the inner ring for cooperating with the lock release ring, the lock release ring forms axial displacement in the rotating action of the helical groove, a plurality of ball head plungers are arranged on the outer ring in the circumferential direction, and a plurality of pits for being in contact with the steel ball end of the ball head plunger are arranged on the limiting ring in the circumferential direction.

2. A full rotation mechanism with lock release according to claim 1, characterized in that The helical groove is distributed along the circumference of the inner ring, and the inner circumferential convex of the lock release ring is provided with a helical convex for being in axial contact with the helical groove.

3. A full rotation mechanism with lock release according to claim 2, characterized in that The helical groove has a pitch of 5-12 mm and a helical angle of 10°-20°.

4. A full rotation mechanism with lock release according to claim 1, wherein The plurality of ball head plungers and the plurality of pits are arranged in a circular array with the axis of the inner ring as the center.

5. A full rotation mechanism with lock release according to claim 4, characterized in that The number of ball head plungers is 6-12, and the pits are arranged at an adjacent interval of less than 10°.

6. A full rotation mechanism with lock release according to claim 1, wherein The ball head plunger comprises a shell, a steel ball and a spring, the steel ball is arranged in the opening of the shell and is used for being in contact with the pit, and the spring is arranged in the shell and is in contact with the spring.

7. A full rotation mechanism with lock release according to claim 6, characterized in that The outer ring is provided with a mounting hole, and the shell is threadedly connected with the mounting hole.

8. A full rotation mechanism with lock release according to claim 1, wherein The outer circumferential of the inner ring is provided with a plurality of positioning grooves in the circumferential direction, the inner circumferential convex of the limiting ring is provided with a limiting convex, and the positioning grooves are connected to one end of the inner ring in the axial direction to form an opening for the limiting convex to enter in the axial direction.

9. A full rotation mechanism with lock release according to claim 1, wherein The device further comprises a shaft ring, the outer circumferential of the inner ring is provided with a mounting groove for clamping and fixing the shaft ring, and the shaft ring is in contact with the limiting ring.

10. A full rotation mechanism with lock release according to claim 1, wherein The spring in the ball head plunger is made of 60Si2MnA material with a hardness of HRC48-52, the curvature radius of the pit is 1.02-1.05 times the radius of the steel ball of the ball head plunger, the depth of the pit is 0.5-1.2 mm, the surfaces of the inner ring and the outer ring are subjected to micro-arc oxidation treatment, the inner ring and the lock release ring are subjected to 20CrMnTi carburizing and quenching, the limiting ring is made of 9Cr18MoV stainless steel and subjected to cryogenic treatment, and the outer ring is further provided with a flange interface.

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