Positioning device for bearing ring machining lathe

Abstract

The utility model belongs to bearing production technical field, concretely relates to a kind of positioning device for bearing ring machining lathe;Including: telescopic component;Limiting component, the limiting component is set in the telescopic component;Clamping jaw component, multiple the clamping jaw component is distributed in the limiting component with the limiting component axis as center in conical shape, and the limiting component can contact multiple clamping jaw component from inside, so that clamping jaw component rotates with contact position as rotating center and opens and closes;Multiple the clamping jaw component end portion close to limiting component is provided with spring, and spring is tightly gripped multiple clamping jaw component in limiting component;Sleeve, the telescopic component can drive the limiting component moves along the sleeve axis, when the limiting component drives multiple the clamping jaw component retract the sleeve, multiple the clamping jaw component mutually close;When the ring is clamped to lathe machining position, it can be clamped ring, and the end face of ring can also be positioned.

Description

Technical Field

[0001] This utility model belongs to the field of bearing manufacturing technology, and specifically relates to a positioning device for a lathe used in bearing ring machining. Background Technology

[0002] Bearings are essential components in modern machinery. They consist of two inner and outer rings of different sizes, and a roller between them. Bearing production involves processing the blank through cutting, heating, forging, punching, rolling, and quenching. After forming, the end faces and inner holes of the bearings need to be ground to remove external metal filings and shape them into standard rings. Modern machine tools (grinding machines, boring machines) require clamping and positioning the bearings during grinding to ensure a stable posture and machining based on the positioning position. However, the clamps used can only grip the bearings from the side, failing to ensure the plane containing the end face is perpendicular to the bearing's axis. If the end face is not perpendicular to the axis, the ground bearing will be skewed, meaning the outer and inner walls are not perpendicular to the cross-section, rendering the bearing unusable.

[0003] For example, CN211331381U discloses a bearing ring clamp, including a chuck body, a jaw seat, and jaws. The jaw seat is fixed to the upper surface of the chuck body. Each jaw seat has a jaw fixed to it, and the jaws are fixed to the jaw seat by a pin axially positioned on the chuck body. The jaws can rotate around the pin. Each jaw includes a clamping surface, and the clamping surfaces of the jaws are distributed on the outer surface of the same cylindrical cavity. The jaws are connected by springs. When the bearing ring is subjected to force, the jaws and springs can transmit and release the force, thus preventing damage to the jaws and releasing the force on the bearing ring, reducing its deformation. While this method can achieve clamping and reduce the impact on the ferrule, it requires manual or other means to press the ferrule against the upper surface of the base during clamping and positioning. This ensures that the end face of the ferrule is tightly against the upper surface of the base for positioning. Only when the end face is tightly against the base can the axis of the ferrule and the axis of rotation of the fixture remain aligned. This prevents the ferrule from rotating eccentrically when the fixture rotates, avoiding damage during tool cutting and grinding, and preventing the axis of the machined surface of the ferrule from shifting from the axis of the ferrule. Therefore, the above solution requires repeated movement and pressure to achieve end face positioning. Furthermore, the ferrule is prone to moving away from the upper surface of the base due to the pressure of the clamping surface during clamping, making it impossible to ensure that the end face of the ferrule is tightly against the upper surface of the base. Summary of the Invention

[0004] Based on this, this application provides a positioning device for a lathe used in machining bearing rings, in order to solve the technical problem in the prior art that can only clamp the rings but cannot ensure that the end face of the ring is perpendicular to the axis of the ring.

[0005] The technical solution to the above-mentioned technical problems in this application is as follows: A positioning device for a bearing ring machining lathe, comprising: Telescopic components; A limiting component, wherein the limiting component is disposed on the telescopic component; The gripper assembly comprises multiple gripper assemblies arranged in a cone shape around the axis of the limiting assembly, and the limiting assembly is able to contact the multiple gripper assemblies from the inside, so that the gripper assemblies can rotate and open and close around the contact position as the rotation center; springs are provided at the ends of the multiple gripper assemblies near the limiting assembly, and the springs tightly clamp the multiple gripper assemblies to the limiting assembly. The sleeve, the telescopic component can drive the limiting component to move along the sleeve axis, and when the limiting component drives the multiple gripper components to retract the sleeve, the multiple gripper components close together. The positioning part is disposed on the open side of the sleeve, and a plurality of the gripper assemblies extend through the positioning part. When the plurality of gripper assemblies clamp the ferrule, they pull the end face of the ferrule to contact the positioning part.

[0006] Preferably, the limiting component includes an inner plate connected to the telescopic component and a bottom ring detachably connected to the inner plate. A limiting ring is connected to the bottom ring, the axis of the limiting ring coincides with the axis of the inner plate, and space is reserved between them for the movement of the gripper component.

[0007] Preferably, the gripper assembly includes gripping arms and grooves disposed at the lower ends of the gripping arms, with the lower ends of the multiple gripping arms circumferentially distributed within the space, and springs embedded in the multiple grooves, with a gap between the lower ends of the gripping arms and the limiting ring.

[0008] Preferably, the inner side of the clamping arm is provided with an arc-shaped groove, and the side end of the inner plate is an arc surface. When the multiple clamping arms are closed, the groove surface contacts the side end of the inner plate.

[0009] Preferably, the upper end of the clamping arm is provided with a clamping piece, and each clamping piece has at least one protrusion on its inner side.

[0010] Preferably, the middle part of the clamping piece is rotatably connected to the upper end of the clamping arm, and a torsion spring is provided at the rotatable connection.

[0011] Preferably, the lower side of the clamping arm is formed with a contact surface, and the limiting ring has a recessed surface for contact with the contact surface.

[0012] Preferably, the positioning part includes multiple blades detachably connected to the sleeve, and a positioning ring is provided in the middle of the multiple blades.

[0013] Preferably, the inner side of the sleeve is provided with an inclined surface, and the open end of the sleeve is provided with a recess for blade embedding.

[0014] Compared with the prior art, this application has at least the following advantages: This application provides a positioning device for a lathe used in machining bearing rings. A telescopic assembly drives a limiting assembly to move. During the retraction of the limiting assembly into the sleeve, the inner wall of the sleeve restricts the gripper assemblies, causing a closing process between the multiple gripper assemblies. When the outer ends of the multiple gripper assemblies contact the outer wall of the ring, they interact and generate friction. At this point, the ring is not fully clamped. Therefore, as the limiting assembly continues to move inwards into the sleeve, the multiple gripper assemblies continue to be restricted by the inner wall of the sleeve, gradually clamping the ring. During this continued clamping process (i.e., the process from the gripper assemblies contacting the ring to clamping it), because clamping is required, the gripper assemblies continue to move inwards into the sleeve. Because it is movable, friction pulls the ferrule along with it, causing the end face of the ferrule to contact the positioning part during this process. This contact ensures that the end face of the ferrule is positioned on the positioning part during clamping, with the end face of the ferrule in close contact with the surface of the positioning part. This allows for both clamping and positioning of the ferrule's end face when it is clamped to the machine tool's machining position, ensuring that the axis of the ferrule is aligned with the rotation axis of the multiple gripper assemblies. This prevents the ferrule from rotating eccentrically. No manual assistance or pressure is needed to ensure the end face of the ferrule is firmly against the positioning part, achieving automatic clamping and positioning without human intervention. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the positioning device for a lathe used in the machining of bearing rings according to this application; Figure 2 This is a sectional view of the positioning device for a lathe used in the machining of bearing rings according to this application; Figure 3 This is a schematic diagram of the sleeve in this application; Figure 4 This is a schematic diagram of the recessed stage of this application; Figure 5 This is a schematic diagram of the positioning ring in this application; Figure 6 This is a schematic diagram of the inner panel of this application; Figure 7 This is a schematic diagram of the limiting ring of this application; Figure 8 This is a schematic diagram of the curved surface of this application; Figure 9This is a schematic diagram of the telescopic component of this application; Figure 10 This is a schematic diagram of the clip in this application; Figure 11 This is a schematic diagram of the clamping arm of this application.

[0016] In the diagram: Sleeve 100; Inclined surface 110; Recessed platform 120; Positioning ring 200; Blade 210; Clamping arm 300; Groove 310; Embedded groove 320; Abutting surface 330; Clamping piece 340; Protrusion 350; Spring 360; Telescopic assembly 400; Connecting pipe 410; Inner plate 500; Arc surface 510; Bottom ring 520; Limiting ring 530; Recessed surface 540. Detailed Implementation

[0017] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0018] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," "top," "bottom," "end," "top," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0020] Please refer to Figure 1 and Figure 11 In one specific embodiment of this application, A positioning device for a bearing ring machining lathe, comprising: Telescopic component 400; A limiting component is disposed on the telescopic component 400; The gripper assembly comprises multiple gripper assemblies arranged in a conical shape around the axis of the limiting assembly, and the limiting assembly is able to contact the multiple gripper assemblies from the inside, allowing the gripper assemblies to rotate and open and close around the contact position; a spring 360 is provided at the end of the multiple gripper assemblies near the limiting assembly, and the spring 360 clamps the multiple gripper assemblies tightly to the limiting assembly. The sleeve 100, the telescopic component 400 can drive the limiting component to move along the axis of the sleeve 100, and when the limiting component drives the multiple gripper components to retract the sleeve 100, the multiple gripper components close to each other. The positioning part is disposed on the open side of the sleeve 100, and a plurality of the gripper assemblies extend through the positioning part. When the plurality of gripper assemblies clamp the ferrule, they pull the end face of the ferrule to contact the positioning part.

[0021] The telescopic component 400 can be a hydraulic cylinder, a pneumatic cylinder, or a device or facility capable of driving the telescopic movement of the limiting component. The limiting component can be an inner support, a connecting plate, or a mounting base that allows the gripper assembly to connect. The gripper assembly can be a gripping arm or gripper capable of rotating around a point, or a clamp capable of rotating and clamping the collar from the outside by being pressed against the inner wall of the sleeve 100. The positioning part can be a positioning plane, a platform, or a flat plate capable of surface contact.

[0022] During use, the sleeve 100 and the telescopic assembly 400 are installed on the machine tool. The telescopic assembly 400 drives the limit assembly to move, causing the limit assembly to move within the sleeve 100. When the limit assembly retracts (e.g. Figure 2 In the middle, the telescopic component 400 drives the limiting component to move downwards, using the inner wall surface of the sleeve 100 (the sleeve 100 remains stationary) to restrict the gripper assembly, causing the gripper assembly to rotate along the virtual center, resulting in a closing process between multiple gripper assemblies. Conversely, when the telescopic component 400 drives the limiting component to move upwards relative to the sleeve 100 (e.g., ... Figure 2When the sleeve 100 is in its initial state, the restriction on the gripper assembly by the inner wall of the sleeve 100 is gradually released. At the same time, under the action of the spring 360, the multiple gripper assemblies open up to each other. That is to say, in the initial state, most of the multiple gripper assemblies are located outside the sleeve 100, and the spring 360 is in the contracted state, which tightly clamps the ends of the multiple gripper assemblies inside the sleeve 100 to the limiting assembly. At this time, the multiple gripper assemblies remain open. When clamping the collar, the collar is moved between the multiple gripper assemblies. Then, the telescopic assembly 400 drives the limiting assembly to move inward into the sleeve 100. At this point, multiple gripper assemblies move inwards towards the sleeve 100, with more of them entering the sleeve 100. The sleeve 100 then contacts the gripper assemblies via its inner wall, causing them to close together. The inner sides of these gripper assemblies then contact the limiting component and rotate (forming a lever structure with the contact point as the fulcrum), causing the ends inside the sleeve 100 to move away from each other, stretching the spring 360°. When the outer ends of the gripper assemblies contact the outer wall of the collar, they interact and generate friction. However, the collar is not yet fully closed at this point. The clamping is complete, so as the limiting component continues to move inward into the sleeve 100, the multiple gripper assemblies continue to clamp the ring further under the constraint of the inner wall of the sleeve 100. During this continued clamping process (that is, the process of the gripper assemblies contacting and clamping the ring), because clamping is required, the gripper assemblies still move inward into the sleeve 100. Therefore, the friction force will pull the ring to move together, so that the end face of the ring contacts the positioning part during this process. By utilizing the contact between the end face of the ring and the positioning part, the end face of the ring is fixed during clamping. The collar is positioned on the positioning part, meaning the axis of the collar is perpendicular to the surface of the positioning part. At this time, the end face of the collar is in close contact with the surface of the positioning part, and the gripper assembly clamps the collar. The telescopic assembly 400 is closed, maintaining the state of clamping and positioning the collar. When the collar is released, the telescopic assembly 400 drives the limiting assembly to extend from the sleeve 100. At this time, the sleeve 100 reduces the restriction on the gripper assembly. As the gripper assembly extends out of the sleeve 100, the spring 360 contracts, and the outer ends of the multiple gripper assemblies move away from each other to open, thereby releasing the clamped collar.

[0023] Using the above method, when clamping the ferrule to the machining position on the machine tool, the ferrule can be clamped and its end face can be positioned, ensuring that the axis of the ferrule is aligned with the rotation axis of the multiple gripper assemblies. This prevents the ferrule from rotating eccentrically. The pulling action of the ferrule during clamping by the multiple gripper assemblies ensures that the end face of the ferrule is tightly pressed against the positioning part, thus completing the positioning. No manual assistance or pressure is required to press the end face of the ferrule against the positioning part, achieving automatic clamping and positioning without human intervention, thus automating the clamping and positioning of the ferrule.

[0024] Specifically, an embodiment of the limiting component in the above process is provided: The limiting component includes an inner plate 500 connected to the telescopic component 400, and a bottom ring 520 detachably connected to the inner plate 500. A limiting ring 530 is connected to the bottom ring 520. The axis of the limiting ring 530 coincides with the axis of the inner plate 500, and space is reserved between them for the movement of the gripper component.

[0025] The movable end of the telescopic assembly 400 is provided with a connecting pipe 410, and the bottom ring 520 is connected to the connecting pipe 410. When the movable end of the telescopic assembly 400 drives the connecting pipe 410 to move along the telescopic direction of the movable end, the connecting pipe 410 can drive the inner plate 500 to move along the axis of the sleeve 100. The ends of multiple gripper assemblies located inside the sleeve 100 are arranged around the inner plate 500 and are bound by springs 360. Figure 7 and Figure 8 The multiple gripper assemblies are initially pressed against the cylindrical surface at the lower end of the inner plate 500. At this time, the outer ends of one side of the multiple gripper assemblies contact the limiting ring 530, which restricts the opening angle of the multiple gripper assemblies. The other ends of the multiple gripper assemblies are at their maximum opening range at this time. When the inner plate 500 moves towards the sleeve 100, the inner wall of the sleeve 100 restricts the multiple gripper assemblies, causing them to close as they move towards the sleeve 100. At this time, as the inner sides of the gripper assemblies contact the edge of the inner plate 500, the gripper assemblies... The 500 edge forms a lever, meaning that when the other end of the multiple gripper assemblies closes to clamp the collar, the ends of the multiple gripper assemblies bound to the spring 360 move away from the lower cylindrical surface of the inner plate 500 and open. The spring 360 will be stretched. When the movable end of the telescopic assembly 400 drives the connecting tube 410 to extend the inner plate 500 out of the sleeve 100, the spring 360 itself contracts and pulls the ends of the multiple gripper assemblies to move closer to the lower cylindrical surface of the inner plate 500 to reset. Then, when the other end of the multiple gripper assemblies extends out of the sleeve 100, it opens and releases the clamped collar.

[0026] The above method enables the clamping and loosening of the ring during actual use.

[0027] Specifically, an embodiment of the gripper assembly in the above process is provided: The gripper assembly includes a gripper arm 300 and a groove 320 disposed at the lower end of the gripper arm 300. The lower ends of the multiple gripper arms 300 are circumferentially distributed in the space. The spring 360 is embedded in the multiple grooves. A gap is left between the lower end of the gripper arm 300 and the limiting ring 530.

[0028] Spring 360 is embedded in groove 320 at the lower end of clamping arm 300. In other words, by winding one spring 360 in multiple grooves 320, the lower ends of multiple clamping arms 300 are bound to the cylindrical surface at the lower end of inner plate 500. At the same time, the elasticity of spring 360 keeps the other end of multiple clamping arms 300 open in the initial state. When the middle of the inner side of clamping arm 300 is squeezed by sleeve 100 from the outside, it contacts the edge of inner plate 500, thus forming a fulcrum and causing clamping arm 300 to rotate.

[0029] Additionally, to make the fulcrum of the clamping arm 300 smoother, such as Figure 8 and Figure 11 In this application, the inner side of the clamping arm 300 is provided with an arc-shaped groove 310, and the side end of the inner plate 500 is an arc surface 510. When the multiple clamping arms 300 are closed, the groove 310 surface contacts the side end of the arc surface 510.

[0030] As the clamping arm 300 is restricted by the sleeve 100, and as the clamping arm 300 moves toward the inner plate 500, the arc groove 310 contacts the arc surface 510. By fully contacting the arc surfaces of the two, a fulcrum is formed when the two contacts. Then, as the clamping arm 300 continues to close, the clamping arm 300 clamps the collar in the form of a lever.

[0031] In the above manner, the clamping arm 300 can be rotated smoothly in the form of a lever to clamp the ring. In actual application, the opening range of the clamping arm 300 is close to the outer diameter of the ring. Therefore, in the whole process of clamping the ring, the rotation clamping form of the clamping arm 300 has a very small displacement and a small rotation amplitude, which can achieve the clamping effect of the ring while ensuring a small overall volume.

[0032] In actual production, impurities on the outer wall of the ferrule cause it to be non-circular. Furthermore, the ferrule may be deformed by collisions during processing and transportation, resulting in a non-circular outer wall. Therefore, in order to adapt to the outer wall when clamping the ferrule, the clamping arm 300 in this application is provided with a clamping piece 340 at its upper end, and each clamping piece 340 has at least one protrusion 350 on its inner side.

[0033] When multiple clamping arms 300 approach and contact the outer wall of the ferrule, as multiple clamping plates 340 approach the ferrule, the protrusions 350 on the inner side of the clamping plates 340 contact the outer wall of the ferrule, making point contact with the outer wall. By utilizing the multiple protrusions 350 on the multiple clamping plates 340 to make contact at different positions on the outer wall of the ferrule, the clamping process is achieved. Utilizing point contact can reduce the impact of irregularities on the outer wall surface on the clamping effect and improve the clamping effect on the ferrule.

[0034] In practical applications, in order to increase the number of clamping points, several protrusions 350 are provided on the inner side of the clamping plate 340. When the number of protrusions 350 is greater than or equal to two, the clamping and limiting ability of the ferrule can be better when at least two protrusions 350 are in contact with the outer wall surface of the ferrule. Therefore, in order to increase the number of contact points of the protrusions 350, in this application, the middle part of the clamping plate 340 is rotatably connected to the upper end of the clamping arm 300, and a torsion spring is provided at the rotatable connection.

[0035] When the clamping arm 300 moves the clamping plate 340 close to the outer wall of the ferrule, one of the protrusions 350 on the inner side of the clamping plate 340 will first contact the outer wall of the ferrule. At this time, under the action of the outer wall of the ferrule, the clamping plate 340 can rotate around the rotation position, so that the other protrusion 350 on the inner side of the clamping plate 340 contacts the outer wall of the ferrule. This causes part of the outer wall of the ferrule to be stuck between the two protrusions 350, thereby increasing the contact points and limiting points when clamping the ferrule, and making the clamping effect of the ferrule better.

[0036] In order to limit the opening range of the multiple clamping arms 300 when they open, the lower side of each clamping arm 300 is formed with a contact surface 330, and the limiting ring 530 is provided with a recessed surface 540 for contact with the contact surface 330. That is, when the multiple clamping arms 300 open, the contact surfaces 330 on the lower side of the multiple clamping arms 300 will contact the recessed surface 540. At this time, the surface contact restricts the outer side of the multiple clamping arms 300 and will not continue to open. This is the maximum opening range among the multiple clamping arms 300.

[0037] Specifically, an embodiment of the positioning unit in the above process is provided: The positioning part includes a plurality of blades 210 detachably connected to the sleeve 100, and a positioning ring 200 is provided in the middle of the plurality of blades 210.

[0038] Multiple blades 210 are detachably connected inside the sleeve 100 and can be installed by bolts or embedding. The positioning ring 200 is located at the open end of the sleeve 100. When multiple protrusions 350 contact the outer wall of the collar, the friction generated causes the clamping arms 300 to move towards the inside of the sleeve 100 along with the middle plate 500, pulling the collar towards the positioning ring 200. This allows the end face of the collar to contact the positioning ring 200. Thus, during the clamping process of the multiple clamping arms 300, the collar is pulled backward and moved to fit tightly against the positioning ring 200, making the axis of the collar coincide with the axis of rotation of the multiple clamping arms 300 following the rotation of the machine tool. This ensures stable rotation of the collar, and when the machine tool cuts and grinds the collar, the axis of the arc surface where the cutting and grinding surface is located coincides with the axis of the collar, resulting in a regular cylindrical collar.

[0039] In a preferred embodiment, the inner side of the sleeve 100 is provided with a bevel 110, and the open end of the sleeve 100 is provided with a recess 120 for embedding the blade 210.

[0040] By embedding the blade 210 into the recess 120, the positioning ring 200 can be installed into the sleeve 100. Furthermore, to enhance the installation firmness, a threaded hole can be made in the recess 120, and then a hole can be made in the blade 210. A bolt is then passed through the hole in the blade 210 and screwed into the bolt hole, thereby installing the blade 210 into the recess 120, enhancing the connection firmness and preventing loosening during use.

[0041] Here, a complete implementation process for the clamping ring process described above is provided: The sleeve 100 and the telescopic assembly 400 are installed on the rotating mechanism (rotary disk or related structure) of the machine tool. The collar is then moved between multiple clamping arms 300, so that multiple clamping plates 340 are located around the outer wall of the collar. The telescopic assembly 400 then moves inwards towards the sleeve 100 via the connecting pipe 410, causing the bottom ring 520 to pull the inner plate 500 back into the sleeve 100. At this time, the inclined surface 110 on the inner wall of the sleeve 100 (which remains stationary, only rotating with the rotating mechanism of the machine tool, without telescopic movement) contacts the outer surface of the multiple clamping arms 300. When the clamping arms 300 enter the sleeve 100, they are pressed inwards, and the ends of the clamping arms 300 near the collar gradually close, thus bringing the clamping plates 340 closer to the outer wall of the collar. When the protrusion... When the protrusion 350 contacts the outer wall of the collar, friction is generated between them. However, the collar is not fully clamped at this time. As the multiple clamping arms 300 continue to move into the sleeve 100, the protrusion 350 gradually clamps the collar. During this process, as the telescopic component 400 continues to retract, it will pull the collar towards the positioning ring 200 while further clamping it (using the friction generated between the protrusion 350 and the outer wall of the collar, but not fully clamped at this time). This will bring the end face of the collar into contact with the positioning ring 200, so that the end face of the collar can be tightly attached to the positioning ring 200. At this time, the multiple protrusions 350 achieve the effect of clamping the collar, so the collar can be tightly attached to the positioning ring 200 while being clamped.

[0042] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A positioning device for a lathe used in machining bearing rings, characterized in that, include: Telescopic components; A limiting component, wherein the limiting component is disposed on the telescopic component; The gripper assembly comprises multiple gripper assemblies arranged in a cone shape around the axis of the limiting assembly, and the limiting assembly is able to contact the multiple gripper assemblies from the inside, so that the gripper assemblies can rotate and open and close around the contact position as the rotation center; springs are provided at the ends of the multiple gripper assemblies near the limiting assembly, and the springs tightly clamp the multiple gripper assemblies to the limiting assembly. The sleeve, the telescopic component can drive the limiting component to move along the sleeve axis, and when the limiting component drives the multiple gripper components to retract the sleeve, the multiple gripper components close together. The positioning part is disposed on the open side of the sleeve, and a plurality of the gripper assemblies extend through the positioning part. When the plurality of gripper assemblies clamp the ferrule, they pull the end face of the ferrule to contact the positioning part.

2. The positioning device for a bearing ring machining lathe as described in claim 1, characterized in that, The limiting component includes an inner plate connected to the telescopic component and a bottom ring detachably connected to the inner plate. A limiting ring is connected to the bottom ring, the axis of the limiting ring coincides with the axis of the inner plate, and space is reserved between them for the movement of the gripper component.

3. The positioning device for a bearing ring machining lathe as described in claim 2, characterized in that, The gripper assembly includes gripping arms and grooves disposed at the lower ends of the gripping arms. The lower ends of the multiple gripping arms are circumferentially distributed in the space, and springs are embedded in the multiple grooves. A gap is left between the lower ends of the gripping arms and the limiting ring.

4. The positioning device for a bearing ring machining lathe as described in claim 3, characterized in that, The inner side of the clamping arm is provided with an arc-shaped groove, and the side end of the inner plate is an arc surface. When the multiple clamping arms are closed, the groove surface contacts the side end of the inner plate.

5. The positioning device for a bearing ring machining lathe as described in claim 3, characterized in that, The upper end of the clamping arm is provided with clamping plates, and each clamping plate has at least one protrusion on its inner side.

6. The positioning device for a bearing ring machining lathe as described in claim 5, characterized in that, The middle part of the clamping piece is rotatably connected to the upper end of the clamping arm, and a torsion spring is provided at the rotatable connection.

7. The positioning device for a bearing ring machining lathe as described in claim 3, characterized in that, The lower side of the clamping arm is formed with a contact surface, and the limiting ring has a recessed surface for contact with the contact surface.

8. The positioning device for a bearing ring machining lathe as described in claim 1, characterized in that, The positioning part includes multiple blades detachably connected to the sleeve, and a positioning ring is provided in the middle of the multiple blades.

9. The positioning device for a bearing ring machining lathe as described in claim 8, characterized in that, The inner side of the sleeve is provided with an inclined surface, and the open end of the sleeve is provided with a recess for blade embedding.

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