Outer ring polishing and receiving device for thin-wall bearing with flange

By combining the gripping and moving mechanism with the circular center interlocking block, the deformation problem of the outer ring of the thin-walled bearing during the grinding process was solved, achieving high-precision and high-efficiency grinding results.

CN223749222UActive Publication Date: 2026-01-02ZHEJIANG XCC GRP CO LTD
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Patent Information

Application Number
CN202520155801.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-01-23
Publication Date
2026-01-02
Estimated Expiration
2035-01-23

AI Technical Summary

Technical Problem

In the existing technology, the outer ring of flanged thin-walled bearings is prone to deformation during the grinding process, resulting in poor machining accuracy and quality.

Method used

A circular center interlocking block is used to grip and move the outer ring for grinding, avoiding clamping deformation. Precise grinding is achieved through the cooperation of lifting cylinder, rotary servo motor and moving mechanism.

Benefits of technology

The outer ring is not easily deformed during the polishing process, which ensures the processing accuracy and quality, and improves the processing effect and efficiency.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

The outer ring polishing and receiving device comprises a vertical limiting plate fixed to the front portion of a machine frame, a vertical guide through hole extending downwards is formed in the middle of the top face of the vertical limiting plate, and a right inclined guide plate is fixed to the upper portion of the front wall face of the vertical limiting plate on the right side of the vertical guide through hole. A horizontal fixing plate is fixed to the top face of the vertical limiting plate, a lifting oil cylinder is fixed to the middle of the top face of the horizontal fixing plate, the bottom end of a push rod of the lifting oil cylinder extends out of the bottom face of the horizontal fixing plate and is fixedly provided with a lifting block, and the lifting block is inserted into the vertical guide through hole in a sleeved mode. The left side wall and the right side wall of the lifting block are close to the inner side walls of the corresponding vertical guide through holes, and the front wall face of the lifting block and the front wall face of the vertical limiting plate are located on the same vertical plane. The outer ring is grabbed and moved through the circular center inserting block to be polished, the outer ring cannot be deformed, and the machining effect is good.
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Description

TECHNICAL FIELD

[0001] The utility model relates to bearing processing equipment technical field more specifically, it is an outer ring polishing and receiving device for flange thin wall bearing. BACKGROUND

[0002] The outer ring of the existing flange thin wall bearing needs to be polished during the processing, and the existing method is generally automatic feeding and discharging, which adopts a receiving block to receive the material, then, after descending, the outer ring is pushed to the position in front of the grinding wheel by a pushing mechanism and clamped in the corresponding position, the pushing force control is difficult during pushing, and since it is a thin wall bearing, the thickness of the outer ring is thin, clamping after pushing by the pushing block can easily deform the outer ring, thereby affecting the processing precision and the quality of the subsequent product. UTILITY MODEL CONTENTS

[0003] The utility model discloses a kind of outer ring polishing and receiving devices for flange thin wall bearing, the outer ring thereof is polished by round central plug-in block grabbing and moving, which will not deform the outer ring, and the processing effect is good.

[0004] The technical problem of the utility model is solved by the following scheme:

[0005] An outer ring polishing and receiving device for flange thin wall bearing, comprising a vertical limiting plate fixed to the front of the rack, a vertical guide hole extending downward is formed in the top surface of the vertical limiting plate, a right oblique guide plate is fixed to the front wall surface of the vertical limiting plate on the right side of the vertical guide hole, the left end of the right oblique guide plate is lower than the right end, a horizontal fixed plate is fixed to the top surface of the vertical limiting plate, a lifting oil cylinder is fixed to the top surface of the horizontal fixed plate, the bottom end of the push rod of the lifting oil cylinder extends out of the bottom surface of the horizontal fixed plate and is fixed with a lifting block, the lifting block is inserted into the vertical guide hole, the left and right side walls of the lifting block are close to the inner side walls of the corresponding vertical guide holes, and the front wall surface of the lifting block is in the same vertical plane as the front wall surface of the vertical limiting plate.

[0006] A forwardly extending lower support portion is formed on the lower front wall surface of the lifting block, and the top surface of the lower support portion corresponds to the top surface of the left end of the right oblique guide plate.

[0007] A grabbing and moving mechanism is installed behind the vertical limiting plate (10) below the vertical guide hole, the front end of the connecting shaft of the grabbing and moving mechanism extends out of the front end of the front-rear extending hole formed on the vertical limiting plate and is fixed with a vertically upward extending grabbing rod, and the upper end of the grabbing rod is movably connected with a round central plug-in block through a hinge shaft, and the round central plug-in block is in front of the lower part of the vertical guide hole.

[0008] The right side of the vertical limiting plate is formed with a groove, the left side wall of the groove is an arc wall surface, a moving mechanism is fixed on the rack at the rear of the vertical limiting plate, a face grinding motor is fixed on the moving block of the moving mechanism, the front end of the output shaft of the face grinding motor is fixed with a grinding wheel, and the left side wall of the grinding wheel is close to and matched with the left side wall of the groove.

[0009] The front wall surface of the vertical limiting plate at the lower part of the vertical guide through hole is fixed with a leftward and downward obliquely extending discharge guide plate, the front end top surface of the discharge guide plate is fixed with a material blocking plate, and the right part of the discharge guide plate is directly above the front part of the vertical guide through hole.

[0010] The front side wall top surface of the right obliquely extending guide plate is fixed with an obliquely extending guide material blocking plate.

[0011] The upper part of the lifting block is formed with an upward extending upper extension part, the top surface of the upper extension part is fixed with a vertical guide rod, and the vertical guide rod is inserted into the corresponding vertical guide through hole formed in the horizontal fixed plate.

[0012] The circular center plug-in block corresponds to the center through hole of the outer ring to be machined, the outer side wall at the front part of the circular center plug-in block is formed with a radially extending edge.

[0013] The grabbing moving mechanism comprises a rear support frame fixed on the rear wall surface of the vertical limiting plate, a telescopic oil cylinder is fixed on the rear wall surface of the rear wall plate of the rear support frame, the front end of the push rod of the telescopic oil cylinder is fixed with a fixed connecting plate, a rotary servo motor is fixed on the front wall surface of the fixed connecting plate, and the connecting rotating shaft at the front part of the rotary servo motor is inserted into the guide sleeve fixed on the inner side wall of the through hole in the vertical limiting plate.

[0014] A plurality of guide rods are fixed on the rear wall surface of the front end plate of the rotary servo motor, the guide rods are inserted into and matched with the corresponding guide sleeves fixed on the front wall surface of the rear wall plate of the rear support frame.

[0015] The rear wall surface of the vertical limiting plate is fixed with an elastic anti-collision plate, the front wall surface of the front end plate of the rotary servo motor corresponds to the rear wall surface of the elastic anti-collision plate, and the connecting rotating shaft is inserted into the middle through hole of the elastic anti-collision plate.

[0016] The moving mechanism comprises a vertical blocking plate fixed at the front of the horizontal fixed plate of the frame, the vertical blocking plate is behind the lower part of the grinding wheel, a connecting block is fixed in the middle of the rear wall surface of the vertical blocking plate, a rear fixed plate is fixed on the top surface of the horizontal fixed plate at the rear of the vertical blocking plate, the two ends of the front-rear extending moving screw are movably connected to the connecting block and the rear fixed plate through bearings, an adjusting servo motor is fixed on the rear wall surface of the rear fixed plate, the output shaft of the adjusting servo motor is a spline shaft, the spline shaft is inserted into the spline hole at the rear end of the moving screw and drives the moving screw to rotate, a moving block is screwed on the moving screw, a horizontal mounting plate is fixed on the top surface of the moving block, an end surface polishing motor is fixed on the top surface of the horizontal mounting plate, a plurality of guide sliding blocks are fixed on the bottom surface of the horizontal mounting plate at the left and right parts, front-rear extending guide rails are fixed on the top surface of the horizontal fixed plate at the left and right parts, the guide rails are inserted into and matched with the front-rear extending guide grooves formed in the middle of the bottom surface of the corresponding guide sliding blocks.

[0017] A vertical blocking strip is fixed on the front wall surface of the vertical limiting plate below the left end of the right oblique guide plate, and a discharging interval is formed between the bottom end of the vertical blocking strip and the bottom end of the vertical guide through hole.

[0018] A discharging interval is formed between the bottom end of the front vertical blocking strip and the bottom end of the vertical guide through hole.

[0019] The protruding effect of the utility model is:

[0020] Compared with the prior art, the outer ring is grabbed and moved for polishing through the circular center insertion block, so that the outer ring will not be deformed, and the processing effect is good. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 is a local structure schematic view of the utility model;

[0022] Fig. 2 is a local structure schematic view of the grabbing moving mechanism of the utility model;

[0023] Fig. 3 is a local structure schematic view of the moving mechanism of the utility model;

[0024] Fig. 4 is a local structure schematic view of the lifting block. DETAILED DESCRIPTION

[0025] Embodiment, see as Figs. 1 to 4The outer ring grinding and receiving device of the flange thin-wall bearing is characterized by comprising a vertical limiting plate 10 fixed on the front of a frame, a vertical guide through hole 11 extending downward is formed in the middle of the top surface of the vertical limiting plate 10, a right oblique guide plate 12 is fixed on the upper front wall surface of the vertical limiting plate 10 at the right side of the vertical guide through hole 11, the left end of the right oblique guide plate 12 is lower than the right end, a horizontal fixed plate 13 is fixed on the top surface of the vertical limiting plate 10, a lifting oil cylinder 14 is fixed on the middle of the top surface of the horizontal fixed plate 13, the bottom end of the push rod of the lifting oil cylinder 14 extends out of the bottom surface of the horizontal fixed plate 13 and is fixed with a lifting block 15, the lifting block 15 is inserted into the vertical guide through hole 11, the left and right side walls of the lifting block 15 are close to the inner side walls of the corresponding vertical guide through holes 11, and the front wall surface of the lifting block 15 is in the same vertical plane as the front wall surface of the vertical limiting plate 10.

[0026] A forward extending lower supporting part 151 is formed on the lower front wall surface of the lifting block 15, the top surface of the lower supporting part 151 corresponds to the top surface of the left end of the right oblique guide plate 12, and a left blocking part 152 extending upward is formed on the left part of the top surface of the lower supporting part 151.

[0027] A grabbing and moving mechanism 20 is installed at the back of the vertical limiting plate 10 below the vertical guide through hole 11, the front end of the connecting rotating shaft 21 of the grabbing and moving mechanism 20 extends out of the front end of the front and back extending through hole formed on the vertical limiting plate 10 and is fixed with a vertically upward extending grabbing rod 22, the upper end of the grabbing rod 22 is movably connected with a circular central plug-in block 23 through a hinge shaft, and the circular central plug-in block 23 is located in front of the lower part of the vertical guide through hole 11.

[0028] A groove is formed at the right lower part of the vertical limiting plate 10, the left side wall of the groove is an arc-shaped wall surface, a moving mechanism 30 is fixed on the frame at the back of the vertical limiting plate 10, an end face grinding motor 40 is fixed on the moving block 31 of the moving mechanism 30, the front end of the output shaft of the end face grinding motor 40 is fixed with a grinding wheel 41, and the left side wall of the grinding wheel 41 is close to the left side wall of the groove and cooperates with the left side wall.

[0029] Further, a discharging guide plate 50 extending obliquely leftward and downward is fixed on the front wall surface of the vertical limiting plate 10 below the vertical guide through hole 11, a blocking plate 51 is fixed on the front end top surface of the discharging guide plate 50, and the right part of the discharging guide plate 50 is directly above the front part of the vertical guide through hole 11.

[0030] Further, an oblique guide blocking plate is fixed on the top surface of the front side wall of the right oblique guide plate 12.

[0031] Further, a left-right extending guide groove is formed on the rear wall surface of the right oblique guide plate 12, and a rear guide groove is formed on the rear part of the left support part 151 and the rear part of the left blocking part 152, which are communicated with each other and correspond to the guide groove. A left-right extending guide groove is formed on the rear part of the discharge guide plate 50.

[0032] Further, an upward extending upper extension part is formed on the upper front wall surface of the lifting block 15, and a vertical guide rod 1 is fixed on the top surface of the upper extension part and inserted into a corresponding vertical guide through hole formed on the horizontal fixing plate 13.

[0033] Further, a first proximity switch 2 is fixed on the front wall surface of the vertical limiting plate 10 on the left side of the vertical guide through hole 11 corresponding to the left side wall of the outer ring 100 to be processed placed on the lower support part 151.

[0034] A second proximity switch 3 is fixed on the front wall surface of the vertical limiting plate 10 on the left side of the bottom part of the vertical guide through hole 11 corresponding to the left side wall of the outer ring 100 to be processed placed on the lower support part 151.

[0035] Further, a circular center plug block 23 corresponding to the center through hole of the outer ring 100 to be processed is provided, and a radially extending edge is formed on the outer side wall of the front part of the circular center plug block 23.

[0036] Further, the grabbing moving mechanism 20 comprises a rear support frame 24 fixed on the rear wall surface of the vertical limiting plate 10, a telescopic oil cylinder 25 fixed on the rear wall surface of the rear wall plate of the rear support frame 24, a fixed connecting plate fixed on the front end of the push rod of the telescopic oil cylinder 25, a rotary servo motor 26 fixed on the front wall surface of the fixed connecting plate, and a connecting rotating shaft 21 of the front part of the rotary servo motor 26 inserted into a guide sleeve fixed on the inner side wall of the through hole of the vertical limiting plate 10.

[0037] Further, a plurality of guide rods 261 are fixed on the rear wall surface of the front end plate of the rotary servo motor 26 and inserted into and matched with corresponding guide sleeves 4 fixed on the front wall surface of the rear wall plate of the rear support frame 24.

[0038] A rear wall surface of the vertical limiting plate 10 is fixed with an elastic anti-collision plate 5, a front wall surface of the front end plate of the rotary servo motor 26 corresponds to a rear wall surface of the elastic anti-collision plate 5, and the connecting rotating shaft 21 is inserted into a middle through hole of the elastic anti-collision plate 5.

[0039] The moving mechanism 30 comprises a vertical blocking plate 32 fixed at the front of the horizontal fixed plate of the frame, the vertical blocking plate 32 is behind the lower part of the grinding wheel 41, the middle of the rear wall surface of the vertical blocking plate 32 is fixed with a connecting block, the top surface of the horizontal fixed plate behind the vertical blocking plate 32 is fixed with a rear fixed plate, the two ends of the front-rear extending moving screw 33 are movably connected to the connecting block and the rear fixed plate through bearings, the rear wall surface of the rear fixed plate is fixed with an adjusting servo motor 34, the output shaft of the adjusting servo motor 34 is a spline shaft, which is inserted into the spline hole at the rear end of the moving screw 33 and drives the moving screw 33 to rotate, the moving block 31 is screwed on the moving screw 33, the top surface of the moving block 31 is fixed with a horizontal mounting plate, the end face polishing motor 40 is fixed on the top surface of the horizontal mounting plate, the bottom surface of the horizontal mounting plate is fixed with a plurality of guide sliding blocks 35 at the left and right parts, the top surface of the horizontal fixed plate is fixed with front-rear extending guide rails at the left and right parts, the guide rails are inserted into and matched with the front-rear extending guide grooves formed in the middle of the bottom surface of the corresponding guide sliding blocks 35.

[0040] The front wall surface of the lower vertical limiting plate 10 at the left end of the right oblique guide plate 12 is fixed with a vertical blocking strip 6, the bottom end of the vertical blocking strip 6 has a discharging interval with the bottom end of the vertical guide through hole 11, the front wall surface of the horizontal fixed plate 13 is fixed with a front vertical blocking strip 7, the front vertical blocking strip 7 is in front of the vertical guide through hole 11, the lower part of the side wall of the front vertical blocking strip 7 is fixed with a side connecting block, and the side connecting block is fixed on the vertical blocking strip 7; the vertical blocking strip 6 and the vertical blocking strip 7 can limit and protect the falling outer ring 100.

[0041] The bottom end of the front vertical blocking strip 7 has a discharging interval with the bottom end of the vertical guide through hole 11.

[0042] All the electric components of the embodiment are electrically connected with the control host through the electric connecting lines, and are controlled by the control host, all the oil cylinders are connected with the hydraulic system through the connecting pipes, and are controlled by the hydraulic system, and the hydraulic system is controlled by the control host to operate, and all of them are conventional structures, which will not be described in detail here.

[0043] In use, the pre-processing equipment of the embodiment moves the outer ring 100 to be processed to the right inclined guide plate 12, the radially extending edge is inserted into the corresponding guide groove, then the right inclined guide plate 12 moves to the left, and finally is on the top surface of the lower support part 151 and leans against the left stop part 152, and the radially extending edge is in the corresponding rear guide groove, at this time, the first proximity switch 2 senses the outer ring 100; and sends the sensing signal to the control host, and the control host controls the corresponding control valve of the hydraulic system to operate, so that the push rod of the lifting oil cylinder 14 pushes and moves the lifting block 15 downward to the bottom of the vertical guide hole 11, at this time, the upper part of the vertical guide rod 1 is at the left end of the right inclined guide plate 12, which blocks the subsequent outer ring 100 from being unloaded; and the second proximity switch 2 senses the outer ring 100, which means that it has been moved to the position, at this time, the circular center plug block 23 is in front of the outer ring 100, then the push rod of the telescopic oil cylinder 25 is retracted, and the circular center plug block 23 is inserted into the middle hole of the outer ring 100, at this time, the front end surface of the outer ring 100 is close to or leans against the rear end surface of the radially extending edge of the circular center plug block 23, which realizes limiting, then the outer ring 100 is moved to the right by the operation of the rotary servo motor 26, when moving, the rear wall surface leans against the front wall surface of the vertical limiting plate 10 and moves along the vertical limiting plate 10 until it moves to the front end surface of the grinding wheel 41, at this time, the grinding wheel 41 is in a rotating state by the operation of the end surface grinding motor 40, and the grinding wheel 41 moves forward by the operation of the adjusting servo motor 34, so as to grind the rear end surface of the outer ring 100.

[0044] The circular center plug block 23 of the embodiment is made of self-lubricating wear-resistant material, and there is a gap between the middle hole of the outer ring 100 and the outer side wall of the circular center plug block 23, so that the insertion into the outer ring 100 is convenient and effective.

[0045] At this time, the push rod of the lifting oil cylinder 14 is retracted to the original position, so as to receive the subsequent outer ring 100.

[0046] After grinding, the outer ring 100 is moved in the opposite direction by the operation of the rotary servo motor 26, and is moved above the discharge guide plate 50, the discharge guide plate 50 of the embodiment can be made of a material whose movement is less than the metal material of the outer ring 100 or a polytetrafluoroethylene plate fixed on the top surface, then the push rod of the telescopic oil cylinder 25 pushes, so that the outer ring 100 is separated from the circular center plug block 23, and falls to the discharge guide plate 50 and moves to the receiving end of the subsequent equipment along the discharge guide plate 50 (which is a subsequent conventional processing equipment or conveying equipment, which will not be described here), the processing effect is good and stable, and the outer ring 100 is not easy to deform during processing, which ensures the processing precision.

[0047] Then, the servo motor 34 is adjusted to move the grinding wheel 41 back to the original position, and then the subsequent machining of the outer ring 100 is performed, which has good machining effect and high efficiency.

[0048] Finally, it should be pointed out that the above embodiments are only more representative examples of the present application. Obviously, the present application is not limited to the above embodiments, but can have many variations. Any simple modification, equivalent change and modification made according to the technical essence of the present application to the above embodiments shall be considered to fall within the protection scope of the present application.

Claims

1. A flange thin-wall bearing outer ring polishing and receiving device, comprising a vertical limiting plate (10) fixed on the front of a frame, characterized in that: The top surface of the vertical limiting plate (10) is formed with a vertical guide through hole (11) extending downward, the right side of the vertical guide through hole (11) is fixed with a right inclined guide plate (12) on the upper part of the front wall surface of the vertical limiting plate (10), the left end of the right inclined guide plate (12) is lower than the right end, the top surface of the horizontal fixing plate (13) is fixed with a lifting oil cylinder (14), the bottom end of the push rod of the lifting oil cylinder (14) extends out of the bottom surface of the horizontal fixing plate (13) and is fixed with a lifting block (15), the lifting block (15) is inserted into the vertical guide through hole (11), the left and right side walls of the lifting block (15) are close to the inner side walls of the corresponding vertical guide through hole (11), and the front wall surface of the lifting block (15) is in the same vertical plane as the front wall surface of the vertical limiting plate (10). The lower part of the front wall surface of the lifting block (15) is formed with a forward extending lower supporting part (151), the top surface of the lower supporting part (151) corresponds to the top surface of the left end of the right inclined guide plate (12), and the left part of the top surface of the lower supporting part (151) is formed with an upward extending left blocking part (152). The rear of the vertical limiting plate (10) below the vertical guide through hole (11) is provided with a grabbing moving mechanism (20), the front end of the connecting rotating shaft (21) of the grabbing moving mechanism (20) extends out of the front end of the front and rear extending through hole formed on the vertical limiting plate (10) and is fixed with a vertically upward extending grabbing rod (22), the upper end of the grabbing rod (22) is movably connected with a circular central plug-in block (23) through a hinged shaft, and the circular central plug-in block (23) is located in front of the lower part of the vertical guide through hole (11). The right lower part of the vertical limiting plate (10) is formed with a groove, the left side wall of the groove is an arc-shaped wall surface, a moving mechanism (30) is fixed on the rack at the rear of the vertical limiting plate (10), an end face polishing motor (40) is fixed on the moving block (31) of the moving mechanism (30), the front end of the output shaft of the end face polishing motor (40) is fixed with a grinding wheel (41), and the left side wall of the grinding wheel (41) is close to the left side wall of the groove and cooperates with the left side wall.

2. The outer ring grinding and receiving device for the thin-wall bearing with flange according to claim 1, characterized in that: The front wall surface of the vertical limiting plate (10) below the vertical guide through hole (11) is fixed with a left and downward inclined discharging guide plate (50), the front end top surface of the discharging guide plate (50) is fixed with a blocking plate (51), and the right part of the discharging guide plate (50) is directly above the front part of the vertical guide through hole (11) and is directly below the front part of the vertical guide through hole (11).

3. The outer ring grinding and receiving device for the thin-wall bearing with flange according to claim 1, characterized in that: The front side wall top surface of the right inclined guide plate (12) is fixed with an inclined guide blocking plate.

4. The outer ring grinding and receiving device for the thin-wall bearing with flange according to claim 1, characterized in that: The rear wall surface of the right inclined guide plate (12) is formed with a left and right extending guide groove, the rear part of the corresponding lower supporting part (151) and the rear part of the left blocking part (152) are formed with a communicated rear guide groove, and the rear guide groove corresponds to the guide groove.

5. The outer ring grinding and receiving device for flange thin-wall bearing according to claim 1, characterized in that: The upper front wall surface of the lifting block (15) is formed with an upward extending upper extension, and the top surface of the upper extension is fixed with a vertical guide rod (1) on the right side, which is inserted into the corresponding vertical guide hole of the horizontal fixed plate (13).

6. The outer ring grinding and receiving device for a flange thin-wall bearing according to claim 1, characterized in that: The front wall surface of the vertical limiting plate (10) on the left side of the vertical guide hole (11) opposite to the left end of the right inclined guide plate (12) is fixed with a first proximity switch (2), which corresponds to the left side wall of the outer ring (100) to be processed placed on the lower support part (151); The front wall surface of the vertical limiting plate (10) on the left side of the bottom of the vertical guide hole (11) is fixed with a second proximity switch (3), which corresponds to the left side wall of the outer ring (100) to be processed placed on the lower support part (151).

7. The outer ring grinding and receiving device for flange thin-wall bearing of claim 1, wherein: The circular center plug-in block (23) corresponds to the center through hole of the outer ring (100) to be processed, and the outer side wall of the front part of the circular center plug-in block (23) is formed with a radially extending edge.

8. The outer ring grinding and receiving device for a flange thin-wall bearing according to claim 1, characterized in that: The grabbing moving mechanism (20) includes a rear support frame (24) fixed on the rear wall surface of the vertical limiting plate (10), and the rear wall surface of the rear wall plate of the rear support frame (24) is fixed with a telescopic oil cylinder (25), the front end of the push rod of the telescopic oil cylinder (25) is fixed with a fixed connection plate, the front wall surface of the fixed connection plate is fixed with a rotary servo motor (26), and the front part of the connecting rotating shaft (21) of the rotary servo motor (26) is inserted into the guide sleeve fixed on the inner side wall of the through hole of the vertical limiting plate (10).

9. The flange bearing outer race grinding and receiving device of claim 8, wherein: The rear wall surface of the front end plate of the rotary servo motor (26) is fixed with a plurality of guide rods (261), which are inserted into and matched with the corresponding guide sleeves (4) fixed on the front wall surface of the rear wall plate of the rear support frame (24).