A kind of inside expanding blind hole joint bearing dismounting device

Abstract

This invention discloses an internally expanding blind bore spherical plain bearing disassembly device, comprising a guide rod, an expanding claw, an expanding pin, an impact device, a buffer device, and a drive device. The expanding claw is located at the front end of the guide rod and is used to extend into the spherical plain bearing and engage with the inner ring of the bearing. The expanding pin is sleeved inside the guide rod, capable of axial movement and compressing the expanding claw to cause it to expand radially. One end of the buffer device is connected to the limiting flange of the guide rod, and the other end contacts the impact device. The drive device is connected to the impact device and is used to drive the impact device to move axially along the guide rod. The buffer device transmits the pulling force to the expanding claw, causing the spherical plain bearing to separate from the bearing housing. This invention uses the expanding claw to grip the bearing from the inside, replacing the traditional hammering method and avoiding damage to the shaft and bearing housing. The buffer device converts the driving force into a smooth pulling force, avoiding impact loads. It is suitable for the confined space of blind bores, is safe and reliable to operate, and saves time and effort.

Description

Technical Field

[0001] This invention relates to the field of bearing technology, specifically to a disassembly device for an internally expanding blind bore spherical plain bearing. Background Technology

[0002] Plain spherical bearings are critical connecting components in heavy machinery fields such as aviation, aerospace, and petroleum equipment, and are widely used in the moving joints of various equipment. In practical use, plain spherical bearings require periodic replacement to ensure equipment reliability due to long-term exposure to alternating loads, wear, or corrosion. However, disassembling plain spherical bearings has always been a technical challenge in maintenance work, especially when they are installed in blind hole structures inside the lugs of the equipment, making disassembly even more difficult.

[0003] Currently, the disassembly of spherical plain bearings mainly relies on traditional manual operations, including direct hammering, simple jacking, and heat disassembly. Direct hammering is simple to operate, but it easily causes permanent damage such as shaft end face deformation, thread damage, and shaft bending, while also posing a safety hazard due to flying metal fragments. Simple jacking uses tools such as hydraulic jacks to directly push the bearing; however, due to the lack of dedicated bushing protection, uneven force can easily occur, causing deformation or scoring of the bearing housing bore, affecting the assembly accuracy of new bearings. Heat disassembly expands the bearing housing bore through heating to achieve disassembly, but improper heating may lead to annealing of the shaft surface and a decrease in hardness, and open flame heating poses a fire risk. These traditional methods are not only inefficient and extremely time-consuming, but also heavily dependent on the operator's experience and physical strength, making it difficult to guarantee the safety and reliability of the disassembly process.

[0004] More importantly, when spherical plain bearings are installed in blind bore structures, traditional tools struggle to apply force from the back of the bearing. Existing disassembly methods often fail to effectively target the inner ring of the bearing, leading to disassembly failure or secondary damage to surrounding structures. Therefore, there is an urgent need for a disassembly device specifically designed for blind bore spherical plain bearings, capable of reliably applying force in confined spaces and efficiently and safely completing the disassembly of spherical plain bearings without damaging the bearing housing bore or adjacent components. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides an internal expansion type blind hole spherical bearing disassembly device. It uses a gripper to pull instead of traditional knocking, which does not damage the shaft and seat hole. The electric push rod drive saves time and effort, is suitable for narrow blind hole spaces, and is safe and reliable to operate.

[0006] This invention is achieved through the following technical solution: An internally expanding blind bore spherical plain bearing disassembly device includes: Guide rod; An expandable chuck is located at the front end of the guide rod and is used to extend into the interior of the spherical bearing and engage with the inner ring of the bearing. An expansion pin is sleeved inside the guide rod, and can move along the axial direction of the guide rod and squeeze the expansion claw, causing the expansion claw to expand radially. An impact device is fitted onto the guide rod; The buffer device has one end connected to the guide rod and the other end in contact with the impact device, and is used to transmit tensile force and buffer impact load; A drive device, connected to the impact device, is used to drive the impact device to move axially along the guide rod, and transmits the tensile force to the expansion jaw through the buffer device, so that the spherical bearing separates from the bearing seat.

[0007] Preferably, the expandable gripper includes multiple grippers arranged at intervals along the circumferential direction, and each gripper has a protruding locking block extending towards the inner ring of the bearing at its end for hooking onto the end face of the inner ring of the spherical bearing.

[0008] Preferably, one end of the plurality of grippers is fixedly connected to the front end of the guide rod, and the other end extends obliquely toward the axis, so that the plurality of grippers are arranged in a conical shape, and the maximum outer diameter formed at the front end in the natural state is smaller than the inner diameter of the inner ring of the spherical bearing.

[0009] Preferably, the expansion pin includes a shaft and a pressing rod; the shaft is sleeved inside the guide rod, with one end extending to the outside of the guide rod and the other end connected to the pressing rod, and the front end of the pressing rod is provided with a pressing structure for pressing the expansion claw.

[0010] Preferably, the extrusion structure is a conical or spherical surface disposed at the front end of the extrusion rod.

[0011] Preferably, the expansion pin is connected to the guide rod via a threaded structure, and the expansion pin is controlled to move axially along the guide rod by rotation.

[0012] Preferably, the buffer device includes a limiting flange, a spring, and a spring support; The limiting flange is fixedly installed at the front end of the guide rod; the spring support is installed between the limiting flange and the impact device; the spring is sleeved on the spring support, with one end abutting against the impact device and the other end abutting against the limiting flange.

[0013] Preferably, the buffer device further includes multiple springs, which are evenly distributed circumferentially between the limiting flange and the impact device.

[0014] Preferably, the driving device is one of an electric push rod, a hydraulic cylinder, a pneumatic cylinder, or a manual hydraulic pump; The driving device is connected to the impact device and is used to drive the impact device to move axially along the guide rod.

[0015] Preferably, there are multiple driving devices, which are evenly distributed along the circumferential direction of the guide rod axis. The driving end of each driving device is connected to the impact device to synchronously drive the impact device to move along the axial direction of the guide rod.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: The internal expansion type blind bore spherical plain bearing disassembly device provided in this application solves the technical problem of difficult disassembly of spherical plain bearings in blind bores through a structural design that combines expansion gripping with buffer force transmission. After the expansion claw is inserted into the inner ring of the spherical plain bearing, the expansion pin is moved axially to make its front end squeeze the claw, forcing the claw to expand radially and tightly engage with the end face of the bearing inner ring, thus achieving effective gripping of the bearing from inside the blind bore. The drive device drives the impact device to move axially along the guide rod, and the buffer device converts the driving force into a smooth pulling force and transmits it to the expansion claw, applying a continuous pulling force to the bearing inner ring, so that the spherical plain bearing overcomes the interference fit friction and is smoothly pulled out of the blind bore. The expandable jaws grip the bearing from the inside, replacing the traditional hammering method and completely avoiding impact damage to the shaft and housing bore, ensuring the assembly accuracy of the new bearing. It is suitable for narrow spaces such as inside the lugs and deep holes, solving the technical problem that traditional tools cannot apply force from the back. The buffer device effectively absorbs the impact load at the moment of start-up, avoiding secondary damage to the bearing and housing bore caused by rigid impact. The drive device provides a smooth and continuous pulling force, and one person can complete the operation, saving time and effort. The overall structure is compact and easy to operate, eliminating safety hazards such as metal fragments flying and tool slippage, significantly improving the safety and reliability of disassembly operations. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the spherical bearing disassembly device of the present invention; Figure 2 This is a schematic diagram of the installation of the guide piston, expansion pin, and buffer device of the present invention; Figure 3 This is a cross-sectional view of the guide rod of the present invention; Figure 4 This is a schematic diagram of the gripper structure of the present invention; Figure 5 This is a schematic diagram of the expansion pin structure of the present invention; In the diagram: 1. Handle; 2. Guide piston; 3. Guide rod; 4. Impact device; 5. Limit flange; 6. Expansion pin; 7. Operating handle; 8. Spring support; 9. Spring; 10. Electric push rod; 11. Push rod bracket; 12. Motor. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of the embodiments of this application, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0024] In the description of the embodiments of this application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0025] The spherical plain bearing is installed in a blind hole within the equipment's lug. The bearing consists of an outer ring and an inner ring. The outer ring is fixed to the blind hole seat using an interference fit, while the inner ring mates with the shaft for rotational connection. Disassembly requires applying a pulling force from the inner ring to pull the entire bearing out of the blind hole, while avoiding damage to the seat and adjacent components. Because the blind hole structure restricts the space for applying force from the back, traditional tools are difficult to use effectively on the inner ring. This embodiment is designed to address this technical challenge.

[0026] An internally expanding blind bore spherical plain bearing disassembly device includes a guide rod 3, an expanding chuck, an expanding pin 6, an impact device 4, a buffer device, and a drive device.

[0027] The expandable claw is set at the front end of the guide rod, and the expansion pin 6 is sleeved inside the hollow guide rod 3. The expansion pin 6 can move along the axial direction of the guide rod 3 and squeeze the expandable claw, so that the expandable claw 1 opens and engages with the inner ring of the spherical bearing. One end of the buffer device is fixedly connected to the guide rod 3, and the other end can contact the impact device 4. The driving end of the drive device is connected to the impact device, and the fixed end of the drive device abuts against the bearing seat. The drive device can drive the impact device 4 to move along the axial direction of the guide rod, so that the spherical bearing separates from the bearing seat.

[0028] This internally expanding blind bore spherical plain bearing disassembly device inserts an expanding claw into the bearing. Axial movement of the expanding pin causes its front end to press against the expanding claw, forcing it to open and tightly engage with the bearing's inner ring end face, effectively gripping the bearing from inside the blind bore. A drive unit moves an impact device axially along a guide rod, and a buffer device smoothly transmits the pulling force to the expanding claw, applying continuous tension to the bearing's inner ring. This allows the spherical plain bearing to overcome interference fit friction and be smoothly pulled out of the blind bore. This device uses expanding claws to grip the bearing from the inside, replacing the traditional hammering method, without damaging the shaft or housing bore, ensuring the assembly accuracy of the new bearing. It is suitable for confined spaces such as inside lugs and deep holes, solving the technical problem of traditional tools being unable to apply force from the back. The electric push rod drive saves time and effort, allowing one person to operate it. The buffer device transmits the pulling force, avoiding impact loads and eliminating safety hazards such as flying metal fragments and tool slippage, ensuring safe and reliable operation.

[0029] In some embodiments, the expandable claw 1 includes a plurality of grippers 1 arranged circumferentially at intervals, and the ends of the grippers 1 are provided with protruding locking blocks extending toward the inner ring of the bearing.

[0030] Specifically, the multiple grippers are arranged in a circumferential array around the axis of the guide rod, with gaps between adjacent grippers to provide them with a certain radial elastic deformation capability. Each gripper has an outward-protruding locking block at its front end (i.e., towards the bearing inner ring), which hooks onto the end face of the spherical plain bearing's inner ring. When the expansion pin moves forward, its front end presses against the rear inner wall of each gripper, forcing the grippers to expand radially outward simultaneously. The locking blocks at the ends of each gripper move outward accordingly, making tight contact with the end face of the spherical plain bearing's inner ring and forming a locking engagement. The multiple grippers are evenly distributed circumferentially, resulting in multiple contact points with the bearing inner ring during gripping, ensuring uniform force distribution and preventing bearing misalignment or slippage caused by single-point force. The gaps between the grippers provide good elastic recovery capability; the grippers can naturally retract after the expansion pin retracts, facilitating removal from the bearing inner ring. The protruding locking block design increases the contact area with the bearing inner ring's end face, improving gripping stability and reliability, making it suitable for disassembling spherical plain bearings with large interference fits.

[0031] Furthermore, one end of each of the multiple grippers is fixed to the end of the guide rod, while the other end is inclined. The multiple grippers are arranged in a conical shape and form an inner diameter smaller than that of the inner ring of the spherical bearing, so as to ensure that the expansion claw can extend into the inner ring of the spherical bearing.

[0032] The roots of the multiple grippers are fixedly connected to the front end face of the guide rod. Each gripper gradually extends outward from its root towards its front end, forming a conical structure that is smaller at the front and larger at the back. The maximum outer diameter of the front end (i.e., the free end) of this conical structure in its natural state is smaller than the inner diameter of the spherical bearing's inner ring, ensuring that the gripper can extend into the bearing's inner ring without obstruction. Once the gripper is in place, pushing the expansion pin moves it forward. The conical surface at the front end of the expansion pin contacts and presses against the inner wall of the rear end of each gripper, forcing the gripper's front end to open outward. This further expands the conical structure, causing the gripper's end catch to engage tightly with the bearing's inner ring end face. The conical arrangement allows the grippers to be in a contracted state in their natural state, facilitating insertion into the narrow space of the bearing's inner ring.

[0033] Furthermore, the guide rod is a hollow rod structure and is connected to the space enclosed by multiple grippers. The expansion pin 6 is coaxially arranged in the guide rod, driving the expansion pin 6 to move so that its end enters the expansion claw 1, squeezing the multiple grippers and causing the expansion claw 1 to engage with the inner ring of the spherical bearing.

[0034] In some embodiments, the expansion pin 6 includes a shaft, a guide piston 2, and a pressing rod; the shaft is sleeved inside the guide rod, one end of which is connected to the operating handle, and the other end is fixedly connected to the guide piston; the pressing rod is disposed at the front end of the guide piston, and the front end of the pressing rod is provided with a pressing structure for pressing the expansion claw.

[0035] Specifically, the shaft passes axially through the hollow guide rod, with its rear end extending out of the guide rod and fixedly connected to the operating handle for easy manual control. The guide piston is fixedly connected to the front end of the shaft and slides against the inner wall of the guide rod, ensuring the straightness and stability of the expansion pin's movement. The extrusion rod is located at the front end of the guide piston, with an extrusion structure machined at its front end. This extrusion structure engages with the rear inner wall of each gripper of the expansion claw. When the operating handle is pushed forward, the shaft drives the guide piston and extrusion rod to move forward synchronously. The conical surface at the front end of the extrusion rod contacts the inner wall of each gripper, generating radial extrusion force, forcing multiple grippers to expand outward simultaneously. When the operating handle is pulled backward, the extrusion rod retracts, the conical surface disengages from the inner wall of the gripper, and the gripper naturally retracts back into its original position under its own elasticity. The sliding fit between the guide piston and the inner wall of the guide rod ensures the linearity of the expansion pin movement, avoiding uneven gripping caused by skewing; the shaft, guide piston, and extrusion rod are linked as a whole, resulting in high transmission efficiency and sensitive operation response; the way the tapered surface at the front end of the extrusion rod engages with the gripper achieves a gradual and controllable expansion force, making it easy for operators to adjust the gripping force according to the actual situation.

[0036] Furthermore, the front end of the extrusion rod is provided with an extrusion structure, which is used to extrude the inner wall of each gripper of the expansion claw when the expansion pin moves forward, forcing the gripper to expand outward; the extrusion structure is a conical surface provided on the extrusion rod, or a spherical surface located at the front end of the extrusion rod.

[0037] When the extrusion structure uses a conical surface, this conical surface is located at the front end of the extrusion rod, and its taper matches the inner wall of the rear end of each gripper. As the expansion pin moves forward, the conical surface gradually contacts the inner wall of the gripper and generates radial extrusion force. As the moving distance increases, the extrusion force gradually increases, causing the grippers to expand outward synchronously and uniformly. This conical surface structure has the advantages of uniform force distribution and a stable and controllable expansion process.

[0038] When the extrusion structure uses a spherical surface, this surface is located at the very front of the extrusion rod and is hemispherical or approximately hemispherical. As the expansion pin moves forward, the spherical surface initially makes point contact with the inner wall of the gripper. As the moving distance increases, the contact point gradually expands, generating a progressive radial extrusion force. This spherical structure has self-centering properties, ensuring uniform force distribution on each gripper even with minute gaps between the expansion pin and the guide rod, preventing misalignment due to assembly errors. Simultaneously, the contact between the spherical surface and the inner wall of the gripper is line or point contact, resulting in low friction and smoother movement, which helps improve operational ease and gripping accuracy.

[0039] Furthermore, the expansion pin is connected to the guide rod via a threaded structure. The expansion pin is controlled to move axially along the guide rod by rotation, thereby controlling the opening and closing of the expansion claw.

[0040] Specifically, the outer surface of the expansion pin is provided with an external thread, and the inner wall of the guide rod is provided with an internal thread that mates with the external thread. The expansion pin and the guide rod are connected by a threaded pair. During operation, the expansion pin is rotated relative to the guide rod by rotating the operating handle or the drive device. Utilizing the helical transmission principle of the threaded pair, the rotational motion is converted into axial movement of the expansion pin.

[0041] The threaded connection enables precise feed control of the expansion pin, allowing operators to accurately adjust the expansion degree of the gripper as needed. This prevents damage to the bearing inner ring due to over-expansion or insecure gripping due to insufficient expansion. The threaded pair has a self-locking characteristic, ensuring that the expansion pin remains in its current position even when the operating handle is released during gripping, guaranteeing a stable and reliable grip without requiring continuous holding force from the operator. Compared to direct push-pull operation, the threaded screw-in method is significantly more labor-saving, especially suitable for disassembly scenarios requiring high gripping force. The feed rate is controllable and quantifiable, facilitating operator mastery and repeatability, thus improving operational standardization and consistency.

[0042] In some embodiments, the guide rod is provided with a piston cavity that cooperates with the guide piston. The guide piston is slidably disposed in the piston cavity to guide the expansion pin to move axially along the guide rod. By being coaxial with the expansion pin, the guide piston ensures that the axis of the expansion pin coincides with the axis of the guide rod during the movement, so that the squeezing force of the front end of the expansion pin on each gripper of the expansion claw is evenly distributed, ensuring that each gripper expands and opens synchronously and evenly.

[0043] In some embodiments, the buffer device includes a limiting flange 5, a spring 9, and a spring support 8; The limiting flange is fixedly installed at the front end of the guide rod (the end away from the gripper) to limit the compression stroke of the spring. The spring support is set between the limiting flange and the impact device. The spring is sleeved on the spring support, with one end abutting against the impact device and the other end abutting against the limiting flange. One end of the spring support is connected to the limiting flange, and the other end is inserted into the impact device. When the drive device pushes the impact device to move axially along the guide rod, the impact device moves along the spring support and compresses the spring. The spring generates elastic force and transmits it through the limiting flange and the guide rod to the expansion pawl, applying a smooth tension to the inner ring of the spherical bearing.

[0044] As an elastic element, the spring can convert the thrust generated by the drive device into a smooth tension, effectively absorbing and buffering the impact load at the moment of start-up, and avoiding damage to the bearing and seat hole caused by rigid impact. The spring support plays a guiding and positioning role for the spring, preventing the spring from bending or deviating during compression, and ensuring that the direction of the tension is always consistent with the axis of the guide rod. The limit flange limits the maximum compression stroke of the spring, preventing over-compression from causing spring failure or device damage.

[0045] Furthermore, multiple springs are evenly distributed around the circumference between the limiting flange 5 and the impact device 4.

[0046] Furthermore, the spring can also be replaced by a rubber elastomer. The rubber elastomer is placed between the impact device and the limiting flange. It uses the elastic deformation of the rubber material to transmit tension and absorb impact. It has the advantages of simple structure, low cost and maintenance-free operation, and is suitable for disassembling small spherical bearings.

[0047] In some embodiments, the driving device is an electric push rod, including a motor 12 and an electric push rod 10. The motor drives the push rod to move linearly, and the extended end of the push rod is connected to the impact device to push the impact device to move axially along the guide rod.

[0048] Specifically, one end of the electric push rod is fixedly mounted on the push rod bracket 11, which is connected to the guide rod. The input end of the electric push rod is connected to the motor, and the output end is connected to the impact device. The fixed end of the electric push rod is used to fix it to the bearing seat. After the motor starts, the rotational motion is converted into the linear motion of the push rod through the reduction mechanism. The push rod pushes the impact device forward, and the impact device transmits the thrust to the guide rod, thereby causing the spherical bearing to separate from the bearing seat.

[0049] In some embodiments, the driving device is a hydraulic cylinder, including a hydraulic cylinder body and a piston rod. The piston rod is connected to the impact device, and the extension and retraction of the piston rod are controlled by a hydraulic system to drive the impact device to move axially along the guide rod.

[0050] The driving device is a pneumatic cylinder, including a cylinder body and a piston rod. The piston rod is connected to the impact device, and compressed air drives the piston rod to extend and retract, thereby driving the impact device to move axially along the guide rod.

[0051] The driving device is a manual hydraulic pump, which generates hydraulic driving force by manually pressurizing, driving the piston rod of the hydraulic cylinder to extend and push the impact device to move axially along the guide rod.

[0052] Furthermore, there are multiple driving devices, which are evenly distributed along the circumferential direction of the guide rod axis. The driving end of each driving device is connected to the impact device to synchronously drive the impact device to move along the axial direction of the guide rod, so that the impact device is subjected to balanced force.

[0053] Multiple drive devices (such as electric actuators, hydraulic cylinders, or pneumatic cylinders) are arranged in a circular array around the axis of the guide rod. The fixed end of each drive device abuts against the bearing housing, and the drive end is connected to the impact device. During operation, all drive devices act synchronously, jointly pushing the impact device to move axially along the guide rod. Because the multiple drive devices are evenly distributed, the driving force forms a resultant force on the impact device. The direction of this resultant force coincides with the axis of the guide rod, making the impact device symmetrical and balanced in force, avoiding the off-center load and jamming phenomena that may occur with unilateral drive.

[0054] Multiple drive units drive synchronously, which can output a larger total driving force and is suitable for disassembling spherical bearings with large interference fit and high disassembly resistance; the driving force is evenly distributed, which ensures that the impact device moves smoothly along the guide rod and avoids bending of the guide rod or skeletal deviation caused by uneven force; even if a single drive unit fails, the remaining drive units can still maintain basic operation, which has a certain degree of redundancy and reliability.

[0055] Example 1 See Figure 1-5 This embodiment provides a disassembly device for an internally expanding blind bore spherical plain bearing, the structure of which is as follows: Figure 1 As shown, it is mainly used for disassembling the spherical bearing installed in the blind hole inside the device ear plate.

[0056] The internal expansion blind hole spherical bearing disassembly device provided in this embodiment mainly consists of a guide rod 3, an expansion claw 1, an expansion pin 6, a guide piston 2, an impact device 4, a buffer device, and a drive device.

[0057] The guide rod 3 is a hollow tubular structure, with its front end fixedly connected to the expansion claw 1, and its interior has a piston cavity that cooperates with the guide piston 2.

[0058] The expandable gripper 1 includes six grippers arranged at intervals along the circumference. One end of each gripper is fixedly connected to the front end face of the guide rod 3, and the other end extends obliquely towards the center. The six grippers are arranged in a conical shape, with the maximum outer diameter of their front ends being smaller than the inner diameter of the spherical bearing inner ring. Each gripper end is provided with a protruding locking block extending towards the bearing inner ring for hooking onto the end face of the spherical bearing inner ring.

[0059] The expansion pin 6 is sleeved inside the guide rod 3, with its rear end extending out of the guide rod 3 and fixedly connected to the operating handle 7, and its front end fixedly connected to the guide piston 2. The guide piston 2 is slidably disposed in the piston cavity of the guide rod 3, slidingly engaging with the inner wall of the piston cavity, and is used to guide the expansion pin 6 to move axially along the guide rod 3. By being coaxial with the expansion pin 6, it ensures that the axis of the expansion pin 6 coincides with the axis of the guide rod 3 during movement, so that the squeezing force of the front end of the expansion pin 6 on each gripper of the expansion claw 1 is evenly distributed.

[0060] The front end of the expansion pin 6 is provided with a compression structure, which is a conical surface in this embodiment. When the operating handle 7 is pushed forward, the expansion pin 6 moves forward, and the conical surface at its front end contacts and compresses the inner wall of the rear end of each gripper of the expansion claw 1, forcing each gripper to expand outward and opening up, so that the locking block at the end of the gripper is tightly engaged with the end face of the inner ring of the spherical bearing.

[0061] The buffer device includes a limiting flange 5, a spring 9, and a spring support 8. The limiting flange 5 is fixedly installed at the front end of the guide rod 3 to limit the compression stroke of the spring 9. The spring support 8 is located between the limiting flange 5 and the impact device 4, and the spring 9 is installed inside the spring support 8, with one end abutting against the impact device 4 and the other end abutting against the limiting flange 5.

[0062] The driving device includes an electric push rod 10, a push rod bracket 11, and a motor 12. The electric push rod 10 is fixedly mounted on the push rod bracket 11, with its input end connected to the motor 12 and its output end connected to the impact device 4. The push rod bracket 11 is fixedly connected to the guide rod.

[0063] Before use, first retract the expansion pin 6 to its root using the operating handle 7, so that each gripper of the expansion claw 1 naturally contracts under its own elasticity, and the maximum outer diameter formed at the front end is smaller than the inner diameter of the spherical bearing inner ring. Insert the front end of the expansion claw 1 into the spherical bearing, so that the gripping block at the end of the gripper passes over the end plane of the spherical bearing inner ring.

[0064] Then push the operating handle 7 forward, the expansion pin 6 moves forward, and the conical surface at its front end squeezes the inner wall of the rear end of each gripper of the expansion claw 1, forcing each gripper to expand outward synchronously and evenly, and the locking block at the end of the gripper makes close contact with the inner ring end plane of the spherical bearing and locks it firmly.

[0065] The motor 12 is started, driving the electric push rod 10 forward. The electric push rod 10 pushes the impact device 4 forward, compressing the spring 9, which generates a spring force. This spring force is transmitted to the expansion claw 1 through the limiting flange 5, guide rod 3, and guide piston 2, applying a smooth pulling force to the inner ring of the spherical plain bearing. Under the continuous action of the spring force, the spherical plain bearing is smoothly pulled out of the blind hole, completing the disassembly.

[0066] After disassembly, the expansion pin 6 is retracted by operating the handle 7. The conical surface at the front end of the expansion pin 6 disengages from the inner wall of the gripper, and each gripper naturally retracts back into its original position under its own elasticity. The outer diameter of the front end of the expansion claw 1 shrinks, and the device can be removed from the inner ring of the bearing.

[0067] This embodiment utilizes a conical arrangement of multiple grippers, allowing the claws to easily extend into the inner ring of the bearing in their natural state. Under the action of the expansion pin, they expand synchronously and uniformly, achieving reliable gripping of the blind-hole spherical plain bearing. A guide piston ensures the linearity and alignment of the expansion pin's movement, resulting in even force distribution on each gripper and preventing misalignment. A spring buffer device converts the thrust of the drive unit into a smooth pulling force, effectively absorbing impact loads and preventing damage to the bearing and housing from rigid impacts. The electric push rod drive saves time and effort, allowing for operation by a single person. The overall structure is compact, easy to operate, safe, and reliable, effectively solving the technical problems of difficult disassembly of blind-hole spherical plain bearings, easily damaged components, and significant operational safety hazards in existing technologies.

[0068] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A disassembly device for an internally expanding blind bore spherical plain bearing, characterized in that, include: Guide rod; An expandable chuck is located at the front end of the guide rod and is used to extend into the interior of the spherical bearing and engage with the inner ring of the bearing. An expansion pin is sleeved inside the guide rod, and can move along the axial direction of the guide rod and squeeze the expansion claw, causing the expansion claw to expand radially. An impact device is fitted onto the guide rod; The buffer device has one end connected to the guide rod and the other end in contact with the impact device, and is used to transmit tensile force and buffer impact load; A drive device, connected to the impact device, is used to drive the impact device to move axially along the guide rod, and transmits the tensile force to the expansion jaw through the buffer device, so that the spherical bearing separates from the bearing seat.

2. The disassembly device for an internally expanding blind bore spherical plain bearing according to claim 1, characterized in that, The expandable chuck includes multiple grippers arranged at intervals along the circumference. Each gripper has a protruding locking block extending towards the inner ring of the bearing at its end, used to hook onto the end face of the inner ring of the spherical bearing.

3. The disassembly device for an internally expanding blind bore spherical plain bearing according to claim 2, characterized in that, One end of each of the multiple grippers is fixedly connected to the front end of the guide rod, and the other end extends obliquely toward the axis, so that the multiple grippers are arranged in a conical shape, and the maximum outer diameter formed at the front end in the natural state is smaller than the inner diameter of the inner ring of the spherical bearing.

4. The disassembly device for an internally expanding blind bore spherical plain bearing according to claim 1, characterized in that, The expansion pin includes a shaft and a pressing rod; the shaft is sleeved inside the guide rod, with one end extending to the outside of the guide rod and the other end connected to the pressing rod, and the front end of the pressing rod is provided with a pressing structure for pressing the expansion claw.

5. The disassembly device for an internally expanding blind bore spherical plain bearing according to claim 4, characterized in that, The extrusion structure is a conical or spherical surface located at the front end of the extrusion rod.

6. The disassembly device for an internally expanding blind bore spherical plain bearing according to claim 1, characterized in that, The expansion pin is connected to the guide rod via a threaded structure, and the expansion pin is controlled to move axially along the guide rod by rotation.

7. The disassembly device for an internally expanding blind bore spherical plain bearing according to claim 1, characterized in that, The buffer device includes a limiting flange, a spring, and a spring support; The limiting flange is fixedly installed at the front end of the guide rod; the spring support is installed between the limiting flange and the impact device; the spring is sleeved on the spring support, with one end abutting against the impact device and the other end abutting against the limiting flange.

8. The disassembly device for an internally expanding blind bore spherical plain bearing according to claim 7, characterized in that, The buffer device also includes multiple springs, which are evenly distributed along the circumference between the limiting flange and the impact device.

9. The disassembly device for an internally expanding blind bore spherical plain bearing according to claim 1, characterized in that, The driving device is one of an electric push rod, a hydraulic cylinder, a pneumatic cylinder, or a manual hydraulic pump. The driving device is connected to the impact device and is used to drive the impact device to move axially along the guide rod.

10. The disassembly device for an internally expanding blind bore spherical plain bearing according to claim 9, characterized in that, The driving device comprises multiple devices, which are evenly distributed along the circumferential direction of the guide rod axis. The driving end of each driving device is connected to the impact device to synchronously drive the impact device to move axially along the guide rod.

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