Self-adapting coaxial and concentric positioning device for inner and outer rings of self-lubricating joint bearing

Abstract

The application provides a self-lubricating joint bearing inner and outer ring self-adapting coaxial and concentric positioning device, and belongs to the technical field of joint bearing manufacturing tooling. The device comprises a mounting base, an inner ring centering assembly, a transmission assembly and an outer ring self-adapting clamping assembly. The inner ring centering assembly is matched with the inner hole of the inner ring of the joint bearing to be machined through a central positioning shaft to realize inner ring centering. The transmission assembly comprises a screw rod with opposite screw thread segments, two clamping sliding blocks are matched with the corresponding screw thread segments respectively, and the clamping sliding blocks drive the clamping pieces to act on the outer ring from the opposite sides synchronously, so that the outer ring is self-adaptively centered relative to the inner ring. The device can also be adapted to different specifications of bearings through replaceable central positioning shafts, adjustable clamping pieces and T-shaped sliding blocks, and has high positioning precision and wide application range.

Description

Technical Field

[0001] This invention belongs to the field of tooling technology for manufacturing spherical plain bearings. Specifically, it relates to an adaptive coaxial and concentric positioning device for the inner and outer rings of a self-lubricating spherical plain bearing, and more particularly to a device for achieving adaptive coaxial and concentric positioning of the inner and outer rings in the injection molding process of a molded self-lubricating spherical plain bearing. Background Technology

[0002] Molded self-lubricating spherical plain bearings consist of an outer ring and an inner ring, with a self-lubricating material layer placed between the outer spherical surface of the inner ring and the inner spherical surface of the outer ring. During manufacturing, the outer ring is typically plastically deformed and wrapped around the inner ring using a hollow extrusion process. After extrusion, an annular gap is left between the inner and outer ring spherical surfaces to fill the self-lubricating material. The self-lubricating material is then injected into this gap using an injection molding process, and after high-temperature curing, a solid lubricating layer is formed.

[0003] This injection molding process requires extremely high precision in the relative position of the inner and outer rings. If the inner and outer rings are not concentric or misaligned, it will directly lead to uneven lubrication layer thickness, and in severe cases, localized material shortages or inner ring misalignment and jamming, causing irreversible damage to the bearing's load-bearing capacity, wear life, and self-lubricating reliability. Existing manual alignment methods rely on operator visual inspection and repeated adjustments using shims, resulting in low efficiency, poor accuracy, and difficulty in ensuring consistency. Some existing positioning fixtures use a unilateral pushing method, which easily causes lateral misalignment of the outer ring, failing to achieve true self-adaptive alignment. Furthermore, for bearing specifications with different end-face height differences, existing devices often require complete replacement of the clamping assembly, lacking adaptability. Therefore, there is an urgent need to develop a process device that can quickly and accurately achieve coaxial concentric positioning using an outer ring self-adaptive alignment method, and can flexibly adapt to different bearing specifications.

[0004] Currently, the relevant existing technologies include: Chinese patent application CN110253352A discloses an integrated fixture for clamping and grinding the inner and outer rings of a bearing. The fixture has a first clamping groove housing a thrust ball bearing and a second clamping groove housing a grinding pad. The bearing ring is placed within the second clamping groove. A bolt clamping adjustment device is located on the outside of the second clamping groove, connected to the grinding pad for fixing and adjusting it. One end of a flange top post is connected to a disc structure and contacts the bearing ring, while the other end has a connecting post. This fixture, by providing two clamping grooves, places the bearing ring within them. An arc-shaped grinding pad is placed on the outside, and the two sides of the bearing ring perpendicular to its circumference are fixed by the thrust of the thrust ball bearing and the flange top post. The outer ring is ground, and the flange top post is removed to directly grind the inner ring. This achieves grinding of the inner and outer cylindrical surfaces of the bearing ring in a single clamping operation, solving the coaxiality error problem that occurs with secondary clamping. However, as a traditional passive clamping mechanism without an active centering mechanism, it cannot achieve active transmission adaptive coaxial and concentric machining.

[0005] Therefore, the existing technology has the following defects and needs to be improved: the existing manual centering method is inefficient, has poor accuracy and insufficient consistency; the single-sided push-type positioning fixture is prone to causing the outer ring to be misaligned, making it difficult to achieve adaptive coaxial and concentric positioning of the inner and outer rings; at the same time, the existing device has poor adaptability to bearings of different specifications and the tooling is not versatile enough. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide a self-lubricating spherical bearing inner and outer ring adaptive coaxial concentric positioning device.

[0007] The self-lubricating spherical bearing inner and outer ring adaptive coaxial concentric positioning device provided by the present invention is used to position the inner ring and outer ring of the spherical bearing to be processed. The self-lubricating spherical bearing inner and outer ring adaptive coaxial concentric positioning device includes: a mounting base, a transmission assembly, an inner ring centering assembly, and an outer ring adaptive clamping assembly. The mounting base includes: a disc and a T-shaped base with a supporting surface; the T-shaped base is fixedly mounted on the disc; The transmission assembly includes a lead screw, which passes through the T-shaped base; The lead screw has a first threaded section and a second threaded section, which are located on the left and right sides of the T-shaped base, respectively, and the threads of the first threaded section and the second threaded section have opposite directions. The inner ring centering assembly includes a central positioning shaft, which is located in the middle of the support surface. The outer diameter of the central positioning shaft forms a clearance fit with the inner hole of the inner ring of the spherical bearing to be processed. The outer ring adaptive clamping assembly includes two clamping sliders and a clamping bar disposed on the clamping sliders. The two clamping sliders are respectively disposed on the left and right sides of the T-shaped base. Both clamping sliders are provided with threaded holes. The threaded holes of the two clamping sliders are respectively screwed into the first threaded section and the second threaded section. The clamping bar cooperates with the clamping sliders to clamp the outer side of the outer ring of the spherical bearing to be processed.

[0008] Preferably, the T-shaped base includes: a vertical web and left and right wing plates of the T-shaped base extending horizontally from the top of the vertical web to both sides of the plane of the vertical web. A threaded hole is provided at the center of the lower end face of the vertical web. A connecting hole is provided at the center of the disk, and a bolt passes through the connecting hole and connects with the threaded hole. The supporting surface is formed by the upper surfaces of the left and right wing plates of the T-shaped base.

[0009] Preferably, a bearing mounting hole is provided at the center of the vertical web, a rolling bearing is installed in the bearing mounting hole, and a smooth shaft section is provided at the middle of the lead screw, the smooth shaft section being rigidly connected to the inner ring of the rolling bearing; The transmission assembly further includes a drive nut and a pin. The drive nut is fixedly connected to one end of the lead screw. Corresponding positions of the drive nut and the lead screw are provided with through holes in the radial direction, and the pin passes through the through holes.

[0010] Preferably, the inner ring centering assembly further includes a positioning pin, which is fixedly installed at the lower end of the central positioning shaft. A cylindrical mounting groove is provided at the center of the supporting surface, and the shape of the positioning pin matches the cylindrical mounting groove. The cylindrical mounting groove is a blind hole structure, and the inner wall of the cylindrical mounting groove and the outer circular surface of the positioning pin are fitted with a small clearance, the small clearance being 0.002mm to 0.015mm. The central positioning shaft is a replaceable positioning shaft, and different central positioning shafts have different outer diameters.

[0011] Preferably, the clamping slider is provided with a plurality of positioning holes, the plurality of positioning holes are arranged along the length direction of the clamping slider, and the clamping rod is detachably inserted into the positioning holes.

[0012] Preferably, each clamping slider is provided with two clamping bars, and the two clamping bars on the same clamping slider are arranged symmetrically back and forth. The clamping bar includes a rigid metal core and an elastic material layer covering the outside of the rigid metal core.

[0013] Preferably, the height of the working section of the clamping bar is greater than the height of the outer ring end face of the spherical bearing to be processed relative to the supporting surface of the T-shaped base; The elastic material layer is a nitrile rubber layer or a fluororubber layer.

[0014] Preferably, the self-lubricating spherical bearing inner and outer ring adaptive coaxial concentric positioning device further includes: a T-shaped slider, wherein the left and right wing plates of the T-shaped base are symmetrically provided with waist-shaped grooves, and the ventral surface of the T-shaped slider is inserted into the waist-shaped grooves. The T-shaped slider moves along the groove of the waist-shaped groove. The wing surface of the T-shaped slider contacts the outer ring end face of the spherical bearing to be processed. The height of the T-shaped slider is consistent with the height difference on one side between the outer ring end face and the inner ring end face of the spherical bearing to be processed.

[0015] Preferably, the T-shaped slider includes multiple replaceable T-shaped sliders. The ventral surfaces of all the T-shaped sliders match the waist-shaped grooves. The multiple T-shaped sliders have different wing surface heights. Any one of the T-shaped sliders is inserted into the waist-shaped groove, and the wing surface height of the T-shaped slider is consistent with the height difference on one side of the outer ring end face and the inner ring end face of the corresponding specification of the spherical bearing to be processed.

[0016] A method for operating a self-lubricating spherical plain bearing inner and outer ring adaptive coaxial concentric positioning device according to the present invention, characterized in that it includes: Step S1: According to the specifications of the spherical bearing to be processed, select a T-shaped slider with an appropriate wing height and a central positioning shaft with an appropriate bearing inner diameter. Rotate the drive nut to make the lead screw rotate, driving the left and right clamping sliders to move in opposite directions to the maximum opening of the clamping assembly. Step S2: Insert the spherical plain bearing to be processed from top to bottom, so that the inner hole of the inner ring of the spherical plain bearing to be processed mates with the central positioning shaft. At the same time, insert the positioning pin at the lower end of the central positioning shaft into the cylindrical mounting groove. At this time, the inner ring of the spherical plain bearing to be processed is centered. Simultaneously, install the two T-shaped sliders in the waist-shaped grooves respectively, and make contact with the end face of the outer ring of the spherical plain bearing to be processed. Step S3: According to the outer diameter of the outer ring of the spherical bearing to be processed, insert the four clamping bars into the corresponding positioning holes; Step S4: Tighten the drive nut in the reverse direction, the lead screw rotates, and drives the left and right clamping sliders to move towards each other synchronously through the reverse thread sections on both sides; during this process, the elastic material layer of the four clamping bars contacts the outer circular surface of the outer ring of the spherical bearing to be processed from both the left and right sides at the same time. Step S5: Continue to tighten the drive nut. Under the action of symmetrical and equal thrust, the outer ring of the spherical plain bearing to be processed will be adaptively pushed to a position that is completely coaxial and concentric with the already centered inner ring of the spherical plain bearing to be processed, regardless of its initial position. At this time, the annular gap between the inner and outer rings of the spherical plain bearing to be processed reaches circumferential uniformity, and the positioning is completed. Step S6: After positioning is completed, the device and the workpiece can be transferred together to the injection molding station for injection molding; Step S7: After the injection molding material has cooled and solidified, loosen the drive nut in the opposite direction to release the clamping slider, and then remove the finished bearing upwards.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention, by setting a synchronous adjustment structure with symmetrical reverse threads, transforms a single drive input into synchronous, equidistant, and reverse displacement outputs of clamping components on both sides, so that the clamping force and clamping position on both sides remain symmetrical and consistent, thereby reducing the skew error caused by manual unilateral adjustment, realizing the adaptive centering positioning of the outer ring of the spherical bearing relative to the inner ring, and improving the positioning accuracy and repeatability of the coaxial and concentric adjustment of the inner and outer rings of the bearing. 2. This invention, by setting an adjustable clamping bar, a replaceable T-shaped slider, and a replaceable central positioning shaft, enables the clamping bar to be adapted to bearings with different outer diameters, enables the T-shaped sliders with different wing heights to be adapted to bearings with different inner and outer ring end face height differences, and enables the central positioning shaft to be adapted to bearings with different inner diameters. This improves the device's adaptability to bearings of different specifications, expands the device's applicable range, and reduces the tooling investment cost required for positioning bearings of different specifications. 3. This invention, by setting a positioning structure in which a cylindrical mounting groove cooperates with a positioning pin, and combining it with a disc base to form a unified and stable mounting foundation, enables the central positioning shaft to maintain reliable positioning accuracy and support rigidity when replaced or reassembled. At the same time, it facilitates the connection of the device with different equipment platforms, thereby improving the overall structural stability, the consistency of positioning reference, and the positioning reliability when reused. Attached Figure Description

[0018] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the self-lubricating spherical bearing inner and outer ring adaptive coaxial concentric positioning device according to an embodiment of the present invention; Figure 2 for Figure 1 The front view and AA sectional view of the embodiment shown; Figure 3 for Figure 1 Left view and BB sectional view of the embodiment shown.

[0019] The diagram shows: Detailed Implementation

[0020] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0021] like Figures 1 to 3 As shown, this embodiment of the invention provides a self-lubricating spherical bearing inner and outer ring adaptive coaxial concentric positioning device, including: a mounting base, a transmission assembly, an inner ring centering assembly, and an outer ring adaptive clamping assembly.

[0022] The aforementioned mounting base includes a base assembly and a T-shaped base 3, the T-shaped base 3 being equipped with a T-shaped slider 10. The base assembly includes a disc 1, with a connecting hole at its center. The T-shaped base 3 includes a vertical web and left and right wing plates extending horizontally from the top of the web to both sides of the web plane. A bearing mounting hole is located at the center of the web surface, and a rolling bearing 9 is rigidly mounted in the bearing mounting hole. A threaded hole is located at the center of the lower end face of the web, which is fixedly connected to the connecting hole of the disc 1 by bolts, thereby lowering the center of gravity of the entire device and providing stable support. The aforementioned transmission assembly includes a lead screw 6, the optical axis section of which is rigidly connected to the inner ring of the rolling bearing 9, allowing the lead screw 6 to rotate freely around its own axis.

[0023] Furthermore, in the transmission assembly, the aforementioned lead screw 6 has symmetrically arranged first and second threaded sections with opposite thread directions on both sides of its optical axis section. A drive nut 7 is fixedly connected to one end of the lead screw 6. A through hole is provided radially at a corresponding position on the drive nut 7 and the lead screw 6, and a pin 8 passes through the corresponding through hole to achieve a keyed connection between the drive nut 7 and the lead screw 6. In a more specific embodiment, the drive nut 7 is a knurled nut for ease of manual operation.

[0024] Furthermore, the aforementioned inner ring centering assembly includes: a central positioning shaft 4 and a positioning pin fixedly installed at the lower end of the central positioning shaft 4; the outer diameter of the central positioning shaft 4 is precisely clearance-fitted with the inner hole of the inner ring of the spherical bearing 11 to be processed, thereby achieving radial rigid centering of the inner ring of the spherical bearing 11. The upper surfaces of the left and right wing plates of the T-shaped base 3 of the present invention together form a support surface, and a cylindrical mounting groove is provided at the center of the support surface. The shape of the aforementioned positioning pin is precisely fitted with the cylindrical mounting groove to ensure that the axis of the aforementioned central positioning shaft 4 is perpendicular to and precisely aligned with the rotation axis of the lead screw 6 in space. Furthermore, waist-shaped grooves are provided on both sides of the cylindrical mounting groove, extending symmetrically laterally along the left and right wing plates. Furthermore, the aforementioned cylindrical mounting groove is a blind hole structure, and its inner wall is fitted with the outer circular surface of the positioning pin with a small clearance. Specifically, the range of the small clearance can be selected between 0.002mm and 0.015mm.

[0025] Furthermore, the aforementioned outer ring adaptive clamping assembly includes a set of clamping sliders 2, each consisting of two clamping sliders respectively disposed on the left and right sides of the web surface of the T-shaped base 3. Each of the two clamping sliders 2 has a threaded hole at its center, used to engage with the first and second threaded sections of the lead screw 6. Specifically, the lead screw 6 passes through the set of clamping sliders 2 and is clamped within the T-shaped base 3. Each clamping slider 2 also has an even number of positioning holes 12 for detachably mounting several clamping rods 5. In the working state, two clamping rods 5 are symmetrically mounted on both the left and right clamping sliders 2, forming four symmetrical clamping points on the outer ring of the spherical plain bearing 11 to be processed. More specifically, the working section height of the clamping rods 5 is greater than the height of the end face of the outer ring of the spherical plain bearing 11 relative to the supporting surface of the T-shaped base 3. The clamping bar 5 adopts a composite structure, with a rigid metal core inside and an elastic material layer on the outside, which forms an elastic protection on the outer ring surface of the spherical bearing 11 to be machined while applying driving force; specifically, the elastic material layer is an oil-resistant and heat-resistant nitrile rubber or fluororubber material.

[0026] The present invention provides a T-shaped slider 10 that is adapted to a T-shaped base 3. The ventral surface of the T-shaped slider 10 can be fully inserted into the waist-shaped groove of the T-shaped base 3, and can move along the groove direction within the waist-shaped groove. The height of the head wing surface of the T-shaped slider 10 is consistent with the height difference on one side between the outer ring end face and the inner ring end face of the spherical bearing 11 to be processed, so that the outer ring of the spherical bearing 11 to be processed is properly supported in the height direction, and the clamping force height corresponds to the center height plane of the spherical bearing 11 to be processed. During the movement along the waist-shaped groove, the wing surface of the T-shaped slider 10 can contact the position of the outer ring end face of the spherical bearing 11 to be processed. By changing the T-shaped slider 10 with different wing surface heights, spherical bearings 11 to be processed with different height differences on one side of the inner and outer ring end faces can be adapted. In a more specific embodiment, the number of positioning holes 12 on the clamping slider 2 is multiple, arranged along the length direction of the clamping slider 2. By installing the clamping rod 5 in the positioning holes 12 at different positions, it is possible to adapt to the spherical bearings 11 to be processed with different outer diameter specifications.

[0027] Furthermore, the self-lubricating spherical bearing inner and outer ring adaptive coaxial concentric positioning device provided by the present invention achieves adaptive coaxial concentricity in the following manner: the inner ring of the spherical bearing 11 to be processed is uniquely and precisely radially positioned via the central positioning shaft 4; when the drive nut 7 is rotated, the lead screw 6 drives the left and right clamping sliders 2 to move synchronously and at the same speed towards each other along the waist-shaped groove through the threaded sections on both sides with opposite directions; four symmetrically installed clamping bars 5 simultaneously contact and push the outer ring of the spherical bearing 11 to be processed from the left and right sides; since the thrust on both sides is equal in magnitude, opposite in direction, and collinear in line of action, the outer ring of the spherical bearing 11 to be processed will be adaptively pushed to a position completely coaxial and concentric with the precisely concentric inner ring of the spherical bearing 11 to be processed in any initial eccentricity or offset state.

[0028] The invention will now be further described with reference to a more specific embodiment: In this embodiment, the aforementioned disc 1 is made of steel and has sufficient mass and base area to ensure the overall stability of the device; a countersunk connection hole is provided in the center of the disc 1. The web and left and right wing plates of the T-shaped base 3 are integrally formed; a precision bearing mounting hole is bored at the upper center of the web, and a double-row angular contact ball bearing 9 is press-fitted into the hole as a rolling bearing; a threaded hole is machined at the center of the lower end face of the web, and a bolt is passed through the connection hole of the disc 1 and screwed into the threaded hole to rigidly connect the T-shaped base 3 and the disc 1 into one piece; the upper surface of the wing plate is a precision-machined support surface for supporting the workpiece; a cylindrical mounting groove is precision-machined at the geometric center of the support surface, and the groove is a blind hole structure for precise engagement with the positioning pin of the central positioning shaft 4. Waist-shaped grooves are also symmetrically machined on the left and right wing plates, penetrating their inner and outer sides.

[0029] The lead screw 6 of the transmission assembly has a smooth shaft section in the middle, which forms a rigid connection with the inner ring of the rolling bearing 9 without relative rotation through a shrink sleeve. The lead screw 6 has a left-handed first thread section on the left side of the smooth shaft section and a right-handed second thread section on the right side. A drive nut 7, which is a knurled nut, is fitted at the outermost end of the second thread section for easy manual operation. A through hole is drilled radially on the outer cylindrical surface of the drive nut 7, and a corresponding through hole is provided on the lead screw 6. A pin 8 passes through the through hole, thus achieving a keyed connection between the drive nut 7 and the lead screw 6. Rotating the drive nut 7 drives the lead screw 6 to rotate synchronously.

[0030] The inner ring centering assembly includes a central positioning shaft 4. The outer diameter of the central positioning shaft 4 is ground to fit the inner ring of the spherical plain bearing 11 with a precision clearance fit of H7 / g6, based on the inner hole size of the inner ring. A locating pin 41 is integrally machined at the lower end of the central positioning shaft 4. The outer surface of the locating pin 41 has a precision small clearance fit with the inner wall of the cylindrical mounting groove. During operation, the inner ring of the spherical plain bearing 11 is fitted onto the central positioning shaft 4, and the locating pin 41 is inserted into the cylindrical mounting groove. The radial position of the inner ring of the spherical plain bearing 11 is then uniquely and precisely determined.

[0031] In the outer ring adaptive clamping assembly, the left and right clamping sliders 2 are symmetrically structured, each with a threaded hole machined at its center. These holes engage with the first and second threaded sections respectively, guiding translation under threaded engagement. The ventral surface of the T-slider 10 can be fully inserted into the waist-shaped groove. The height of the wing surface of the T-slider 10 is precisely designed to match the height difference on one side between the outer and inner ring end faces of the spherical plain bearing 11 to be processed. This ensures that the outer ring end face of the spherical plain bearing 11 is always radially symmetrical at its center position, guaranteeing that the clamping force acts horizontally on the center height plane of the bearing assembly. By replacing the T-slider 10 with different wing surface heights, spherical plain bearings with different height differences on one side of the inner and outer ring end faces can be adapted without replacing the entire clamping assembly.

[0032] Each clamping slider 2 has a row of equidistant positioning holes 12 on its upper part, with an even number of holes. The clamping rods 5 are composed of an inner high-strength steel metal core and an outer layer of nitrile rubber elastic material coated by vulcanization. In use, according to the outer diameter of the outer ring of the spherical bearing 11 to be processed, two symmetrical positioning holes 12 are selected on each of the left and right clamping sliders 2, and two clamping rods 5 are inserted into each hole, for a total of four clamping rods 5, forming a completely symmetrical clamping layout, creating four symmetrical clamping points on the outer ring of the spherical bearing 11 to be processed.

[0033] Furthermore, the working method of the self-lubricating spherical bearing inner and outer ring adaptive coaxial concentric positioning device of the present invention includes: Step S1: According to the specifications of the bearing to be processed, select a T-shaped slider 10 with an appropriate wing height and a central positioning shaft 4 with an appropriate bearing inner diameter, rotate the drive nut 7 to make the lead screw 6 rotate, and drive the left and right clamping sliders 2 to move in opposite directions to the maximum opening. Step S2: Insert the spherical plain bearing 11 from top to bottom, so that the inner hole of the inner ring of the spherical plain bearing 11 mates with the central positioning shaft 4. At the same time, insert the positioning pin at the lower end of the central positioning shaft 4 into the cylindrical mounting groove. At this time, the inner ring of the spherical plain bearing 11 is centered. Simultaneously, install the two T-shaped sliders 10 into the waist-shaped grooves and make contact with the end face of the outer ring of the spherical plain bearing 11.

[0034] Step S3: According to the outer diameter of the outer ring of the spherical bearing 11 to be processed, insert the four clamping rods 5 into the corresponding positioning holes 12; Step S4: Tighten the drive nut 7 in the opposite direction, and the lead screw 6 rotates, driving the left and right clamping sliders 2 to move in opposite directions synchronously through the reverse thread sections on both sides; during this process, the elastic material layer of the four clamping rods 5 simultaneously contacts the outer circular surface of the outer ring of the spherical bearing 11 to be processed from the left and right sides. Step S5: Continue to tighten the drive nut 7. Under the action of symmetrical and equal thrust, the outer ring of the spherical bearing 11 to be processed will be adaptively pushed to a position that is completely coaxial and concentric with the already centered inner ring of the spherical bearing 11 to be processed, regardless of its initial position. At this time, the annular gap between the inner and outer rings of the spherical bearing 11 to be processed reaches circumferential uniformity, and the positioning is completed. Step S6: After positioning is completed, the device and the workpiece can be transferred together to the injection molding station for injection molding; Step S7: After the injection molding material has cooled and solidified, loosen the drive nut 7 in the opposite direction, release the clamping slider 2, and then remove the finished bearing upwards.

[0035] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. 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. Therefore, they should not be construed as limitations on this application.

[0036] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A self-lubricating spherical bearing inner and outer ring adaptive coaxial concentric positioning device, characterized in that, The self-lubricating spherical bearing inner and outer ring adaptive coaxial and concentric positioning device for positioning the inner and outer rings of the spherical bearing (11) to be processed includes: a mounting base, a transmission assembly, an inner ring centering assembly and an outer ring adaptive clamping assembly. The mounting base includes: a disc (1) and a T-shaped base (3) with a supporting surface; the T-shaped base (3) is fixedly mounted on the disc (1); The transmission assembly includes a lead screw (6) which passes through the T-shaped base (3); The lead screw (6) has a first threaded section and a second threaded section, the first threaded section and the second threaded section are located on the left and right sides of the T-shaped base (3) respectively, and the thread directions of the first threaded section and the second threaded section are opposite; The inner ring centering assembly includes a central positioning shaft (4), which is located in the middle of the support surface. The outer diameter of the central positioning shaft (4) forms a clearance fit with the inner ring inner hole of the spherical bearing (11) to be processed. The outer ring adaptive clamping assembly includes two clamping sliders (2) and a clamping bar (5) disposed on the clamping sliders (2). The two clamping sliders (2) are respectively disposed on the left and right sides of the T-shaped base (3). Both clamping sliders (2) are provided with threaded holes. The threaded holes of the two clamping sliders (2) are respectively screwed into the first threaded section and the second threaded section. The clamping bar (5) cooperates with the clamping sliders (2) to clamp the outer side of the outer ring of the spherical bearing (11) to be processed.

2. The self-lubricating spherical bearing inner and outer ring adaptive coaxial concentric positioning device according to claim 1, characterized in that, The T-shaped base (3) includes: a vertical web and left and right wing plates of the T-shaped base (3) extending horizontally from the top of the vertical web to both sides of the plane of the vertical web. A threaded hole is provided at the center of the lower end face of the vertical web. A connecting hole is provided at the center of the disk (1), and a bolt passes through the connecting hole and connects with the threaded hole. The supporting surface is formed by the upper surfaces of the left and right wing plates of the T-shaped base (3).

3. The self-lubricating spherical bearing inner and outer ring adaptive coaxial concentric positioning device according to claim 2, characterized in that, A bearing mounting hole is provided at the center of the vertical web, and a rolling bearing (9) is installed in the bearing mounting hole. The lead screw (6) has a smooth shaft section at the middle position, and the smooth shaft section is rigidly connected to the inner ring of the rolling bearing (9). The transmission assembly further includes a drive nut (7) and a pin (8). The drive nut (7) is fixedly connected to one end of the lead screw (6). The drive nut (7) and the lead screw (6) are provided with through holes in the radial direction at corresponding positions. The pin (8) passes through the through holes.

4. The self-lubricating spherical bearing inner and outer ring adaptive coaxial concentric positioning device according to claim 2, characterized in that, The inner ring centering assembly also includes a positioning pin (41), which is fixedly installed at the lower end of the central positioning shaft (4). A cylindrical mounting groove is provided at the center of the supporting surface, and the shape of the positioning pin (41) matches the cylindrical mounting groove. The cylindrical mounting groove is a blind hole structure, and the inner wall of the cylindrical mounting groove and the outer circular surface of the positioning pin (41) are in a small clearance fit, the small clearance range being 0.002mm to 0.015mm; The central positioning shaft (4) is a replaceable positioning shaft, and different central positioning shafts (4) have different outer diameters.

5. The self-lubricating spherical bearing inner and outer ring adaptive coaxial concentric positioning device according to claim 1, characterized in that, The clamping slider (2) is provided with a plurality of positioning holes (12), which are arranged along the length direction of the clamping slider (2), and the clamping rod (5) is detachably inserted into the positioning holes (12).

6. The self-lubricating spherical bearing inner and outer ring adaptive coaxial concentric positioning device according to claim 5, characterized in that, Each clamping slider (2) is provided with two clamping rods (5), and the two clamping rods (5) on the same clamping slider (2) are arranged symmetrically back and forth; The clamping bar (5) includes a rigid metal core and an elastic material layer covering the outside of the rigid metal core.

7. The self-lubricating spherical bearing inner and outer ring adaptive coaxial concentric positioning device according to claim 6, characterized in that, The working section height of the clamping bar (5) is greater than the height of the outer ring end face of the spherical bearing (11) to be processed relative to the supporting surface of the T-shaped base (3); The elastic material layer is a nitrile rubber layer or a fluororubber layer.

8. The self-lubricating spherical bearing inner and outer ring adaptive coaxial concentric positioning device according to claim 2, characterized in that, Also includes: The T-shaped slider (10) has symmetrical waist-shaped grooves on its left and right wing plates, and the ventral surface of the T-shaped slider (10) is inserted into the waist-shaped grooves. The T-shaped slider (10) moves along the groove of the waist-shaped groove. The wing surface of the T-shaped slider (10) contacts the outer ring end face of the spherical bearing (11) to be processed. The height of the wing surface of the T-shaped slider (10) is consistent with the height difference on one side between the outer ring end face and the inner ring end face of the spherical bearing (11) to be processed.

9. The self-lubricating spherical bearing inner and outer ring adaptive coaxial concentric positioning device according to claim 8, characterized in that, The T-slider (10) includes a plurality of replaceable T-sliders (10). The ventral surfaces of all of the T-shaped sliders (10) are matched with the waist-shaped grooves. Multiple T-shaped sliders (10) have different wing surface heights. Any one of the T-shaped sliders (10) is inserted into the waist-shaped groove, and the wing surface height of the T-shaped slider (10) is consistent with the height difference on one side of the outer ring end face and the inner ring end face of the corresponding specification of the spherical bearing (11) to be processed.

10. A method for operating a self-lubricating spherical plain bearing inner and outer ring adaptive coaxial concentric positioning device according to any one of claims 1 to 9, characterized in that, include: Step S1: According to the specifications of the spherical bearing (11) to be processed, select a T-shaped slider (10) with an appropriate wing height and a central positioning shaft (4) with an appropriate bearing inner diameter, rotate the drive nut (7) to make the lead screw (6) rotate, and drive the left and right clamping sliders (2) to move in opposite directions to the maximum opening of the clamping assembly. Step S2: Insert the spherical plain bearing (11) to be processed from top to bottom, so that the inner hole of the inner ring of the spherical plain bearing (11) to be processed is engaged with the central positioning shaft (4). At the same time, insert the positioning pin (41) at the lower end of the central positioning shaft (4) into the cylindrical mounting groove. At this time, the inner ring of the spherical plain bearing (11) to be processed is centered. At the same time, install the two T-shaped sliders (10) in the waist-shaped groove respectively, and contact the end face of the outer ring of the spherical plain bearing (11) to be processed. Step S3: According to the outer diameter of the outer ring of the spherical bearing (11) to be processed, insert the four clamping bars (5) into the corresponding positioning holes (12); Step S4: Twist the drive nut (7) in the opposite direction, and the screw (6) rotates, driving the left and right clamping sliders (2) to move in opposite directions through the reverse thread sections on both sides; during this process, the elastic material layers of the four clamping bars (5) simultaneously contact the outer circle surface of the outer ring of the spherical bearing (11) to be processed from the left and right sides. Step S5: Continue to tighten the drive nut (7). Under the action of symmetrical and equal thrust, the outer ring of the spherical bearing (11) to be processed will be adaptively pushed to a position that is completely coaxial and concentric with the inner ring of the spherical bearing (11) that has been centered. At this time, the annular gap between the inner ring and the outer ring of the spherical bearing (11) to be processed reaches circumferential uniformity, and the positioning is completed. Step S6: After positioning is completed, the device and the workpiece can be transferred together to the injection molding station for injection molding; Step S7: After the injection molding material has cooled and solidified, loosen the drive nut (7) in the opposite direction, release the clamping slider (2), and then remove the finished bearing upwards.

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