A raceway rib superfinishing device

Abstract

The utility model discloses a raceway baffle edge super-precision grinding device, including baffle edge grinding mechanism, raceway grinding mechanism, servo electric drive mechanism, baffle edge grinding mechanism includes horizontal slide, and the top of horizontal slide is installed with baffle edge grinding seat, and baffle edge grinding seat is installed with baffle edge grinding assembly through angle adjusting structure, raceway grinding mechanism includes raceway grinding slide, and the top of raceway grinding slide is installed with adjusting frame, and the adjusting frame is installed with raceway grinding seat and the adjusting assembly for adjusting raceway grinding seat angle, and raceway grinding seat is installed with raceway grinding assembly, servo electric drive mechanism includes servo electric drive main shaft in the area below grinding station and the lower pressure subassembly in the area above grinding station, and the lower pressure subassembly is used for pressing on the top end face of bearing steel ring.

Description

Technical Field

[0001] This utility model belongs to the field of bearing processing, specifically a raceway edge ultra-precision grinding device. Background Technology

[0002] Tapered roller bearings consist of an inner ring, an outer ring, and rollers between them. During the manufacturing process, the raceway surfaces of both the inner and outer rings need to be ground. For the inner ring, the flange on one side of the raceway surface also needs to be ground. Traditional inner ring grinding requires two separate machines to process the flange and raceway surface, necessitating two clamping operations. This leads to datum deviations and results in substandard inner ring accuracy. Therefore, equipment for grinding the bearing inner ring flange and raceway has been developed. However, existing equipment for grinding the bearing inner ring flange and raceway has the following problems:

[0003] 1. Existing flange and raceway grinding equipment does not have the capability to adjust the grinding angle of the flange and raceway when performing ultra-precision operations on the inner ring of bearings;

[0004] 2. Existing edge and raceway grinding equipment does not have the capability to adjust the grinding stroke of the edge and raceway when performing ultra-precision operations on the inner ring of bearings. Utility Model Content

[0005] To solve the above-mentioned technical problems, the inventors, through practice and summarization, derived the technical solution of this utility model, which adopts the following technical solution:

[0006] A raceway edge ultra-precision grinding device, comprising:

[0007] The edge grinding mechanism includes a transverse slide, a edge grinding seat is mounted on the top of the transverse slide, and an edge grinding component is mounted on the edge grinding seat via an angle adjustment structure.

[0008] The raceway grinding mechanism includes a raceway grinding slide, an adjustment frame is mounted on the top of the raceway grinding slide, a raceway grinding seat and an adjustment component for adjusting the angle of the raceway grinding seat are mounted on the adjustment frame, and a raceway grinding component is mounted on the raceway grinding seat.

[0009] The servo electric drive mechanism includes a servo electric drive spindle located in the area below the grinding station and a pressing assembly located in the area above the grinding station. The pressing assembly is used to press against the top end face of the bearing steel ring.

[0010] Preferably, the angle adjustment structure includes a worm and a worm wheel mounted on a side-grinding seat, the worm and worm wheel cooperating, a drive gear mounted on the rotating shaft of the worm wheel, an operating lever provided at one end of the worm, an arc-shaped rack meshing with the drive gear mounted on the side-grinding assembly, an arc-shaped slot mounted on the side-grinding seat, a clamping bolt mounted in the arc-shaped slot, and the clamping bolt mounted on the side-grinding assembly.

[0011] Preferably, the flange grinding assembly includes a first grinding drive assembly and a flange grinding assembly, and the raceway grinding assembly includes a second grinding drive assembly and a raceway grinding assembly;

[0012] Both grinding drive assembly one and grinding drive assembly two are fixed bases. A servo motor is mounted on the fixed base. An eccentric drive shaft is mounted on the output end of the servo motor. One end of the eccentric drive shaft is rotatably mounted on the fixed base. An eccentric sleeve, an adjusting sleeve, and a locking nut are mounted on the eccentric drive shaft. Rolling elements are mounted on the outer side of the eccentric sleeve. The adjusting sleeve is axially slidingly fitted on the eccentric drive shaft, and the side in contact with the eccentric sleeve is an annular toothed surface. The locking nut is used to press the adjusting sleeve so that the corresponding ends of the eccentric sleeve and the adjusting sleeve are in contact and remain relatively stationary.

[0013] A movable frame is fitted on the outer side of the rolling element. The movable frame is slidably fitted on the fixed seat. The movable frame is used to install the edge grinding assembly or the raceway grinding assembly. A guide body is installed on the fixed seat, and one end of the guide body is inserted into the movable frame. An elastic body is fitted on the outer side of the guide body.

[0014] Preferably, the edge grinding assembly includes a mounting plate mounted on a movable frame via a rotating shaft. The movable frame is provided with an angle adjustment groove, and the mounting plate limits the angle of the mounting plate relative to the movable frame by a locking bolt in the angle adjustment groove.

[0015] Preferably, an adjusting screw is rotatably mounted on the movable frame. The adjusting screw is used to adjust the angle of the mounting plate relative to the movable frame. The mounting plate is used to mount the edge grinding part.

[0016] The mounting plate is equipped with long bolts, the ends of which are connected to the edge grinding parts. The position of the edge grinding parts relative to the mounting plate is adjustable along the length of the long bolts.

[0017] Preferably, the adjustment assembly includes an operating shaft, a worm shaft, and a worm wheel seat. The operating shaft and the worm shaft form a transmission engagement through gear transmission. The worm shaft and the worm wheel seat form a transmission engagement. The worm wheel seat is rotatably mounted on the adjustment frame and fixed on the raceway grinding seat.

[0018] Preferably, the pressing assembly includes a frame, with vertically arranged pressing slides installed on both sides of the frame. A pressing cylinder is installed on the top of the pressing slide, along with the piston end of the pressing cylinder and the pressing slide. A pressing component is installed on the pressing slide, and the bottom of the pressing component is provided with a socket body inserted into the bearing steel ring and a pressing rolling body pressed against the top surface of the bearing steel ring.

[0019] Preferably, a rear positioning arc-shaped seat is independently provided on the rear side of the servo drive spindle, the center of which is on the axis of the servo drive spindle, and two radially arranged adjusting support rollers are installed on the rear positioning arc-shaped seat.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. This utility model uses a single clamping to complete the machining of the inner ring's flange and raceway surface. The pressing rolling element (self-aligning bearing) of the top pressing assembly presses the inner ring onto the servo electric drive spindle. The servo electric drive spindle drives the inner ring to rotate. At the same time, the flange grinding mechanism grinds the flange surface on the left side, and the raceway grinding mechanism grinds the raceway surface on the right side, finally completing the rough and fine grinding operations.

[0022] 2. The driving mechanism of the raceway grinding mechanism and the flange grinding mechanism of this utility model adopts a combination structure of eccentric drive shaft and eccentric sleeve to realize the reciprocating motion of the grinding workpiece (oilstone). When the flange width and the raceway surface width are different, the stroke of the oilstone can be adaptively adjusted by adjusting the angular offset of the eccentric sleeve relative to the eccentric drive shaft, thereby completing the processing of flanges and raceway surfaces of different widths. At the same time, compared with the traditional swing arm transmission method, it can reduce the overall vibration inertia. An elastic body is set between the moving frame and the fixed seat to ensure that the moving frame and the rolling element are always in close contact, reducing its vibration and inertia at the reversing pole. The rolling element (bearing) can effectively reduce the friction between the two. In addition, both the raceway grinding mechanism and the flange grinding mechanism are equipped with an angle adjustment structure to adaptively adjust the tilt angle of the flange grinding workpiece and the raceway surface grinding assembly relative to the bearing steel ring, so as to realize the processing of the bearing steel ring flange and raceway surface at different angles.

[0023] 3. This utility model uses rolling elements (bearings) mounted on the outer side of the eccentric sleeve to drive the corresponding structure to achieve reciprocating motion. The spring component is used to ensure that the outer circumferential surface of the bearing and the corresponding structure are always in contact without abnormal noise or vibration, thus ensuring the quality and precision of the ground surface. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0025] Figure 2This is a structural diagram of the edge grinding mechanism of this utility model;

[0026] Figure 3 This is a schematic diagram of the overall structure of the edge grinding assembly of this utility model;

[0027] Figure 4 This is a schematic diagram of the angle adjustment structure of this utility model;

[0028] Figure 5 This is a schematic diagram of the overall structure of the raceway grinding mechanism of this utility model;

[0029] Figure 6 This is a schematic diagram of the structure of the fixing base of this utility model;

[0030] Figure 7 for Figure 6 The main view;

[0031] Figure 8 for Figure 7 Cross-sectional view at point AA;

[0032] Figure 9 This is a schematic diagram of the overall structure of the pressing component of this utility model;

[0033] Figure 10 for Figure 1 A magnified view of a section at point A in the middle;

[0034] Figure 11 This is a diagram showing the position distribution of the rear-mounted positioning arc-shaped seat and the servo electric drive spindle.

[0035] Figure 12 This is a cross-sectional view of the bearing inner ring structure.

[0036] In the picture:

[0037] 200. Edge grinding mechanism; 210. Transverse slide table; 220. Edge grinding seat; 230. Edge grinding assembly; 231. Edge grinding assembly; 232. Fixed seat; 233. Servo motor; 234. Eccentric drive shaft; 235. Eccentric sleeve; 236. Adjusting sleeve; 237. Locking nut; 238. Rolling element; 239. Moving frame; 2310. Guide body; 2311. Mounting plate; 2312. Angle adjustment groove; 2313. Locking bolt; 2314. Adjusting screw; 2315. Elastic body; 2316. Edge grinding part; 2137. Long bolt; 240. Angle adjustment structure; 241. Operating lever; 242. Drive gear; 243. Arc rack; 244. Arc groove; 245. Clamping bolt;

[0038] 300. Raceway grinding mechanism; 310. Raceway grinding slide; 320. Adjusting frame; 330. Raceway grinding seat; 340. Adjusting assembly; 341. Operating shaft; 342. Worm shaft; 343. Worm gear seat; 350. Raceway grinding assembly; 351. Raceway grinding assembly;

[0039] 400. Pressing assembly; 410. Frame; 420. Pressing slide plate; 430. Pressing cylinder; 440. Pressing component; 441. Socket; 442. Pressing rolling element;

[0040] 500. Servo-driven electric spindle; 501. Rear positioning arc-shaped seat; 502. Adjustable support roller. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0042] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "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 utility model 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 utility model.

[0043] Example 1

[0044] like Figures 1 to 9 As shown, a raceway edge ultra-precision grinding device includes:

[0045] like Figure 2 As shown, the edge grinding mechanism 200 includes a transverse slide 210, a edge grinding seat 220 mounted on the top of the transverse slide 210, and an edge grinding assembly 230 mounted on the edge grinding seat 220 via an angle adjustment structure 240. The angle adjustment structure 240 adjusts the inclination angle of the edge grinding assembly 230 relative to the edge surface to be processed. The transverse slide 210 is used to adjust the transverse position of the edge grinding seat 220 to move closer to or further away from the edge surface to be processed on the bearing steel ring, thereby achieving edge grinding operations at different angles.

[0046] like Figure 5As shown, the raceway grinding mechanism 300 includes a raceway grinding slide 310, an adjusting frame 320 mounted on the top of the raceway grinding slide 310, a raceway grinding seat 330 mounted on the adjusting frame 320, and an adjusting component 340 for adjusting the angle of the raceway grinding seat 330. A raceway grinding component 350 is mounted on the raceway grinding seat 330. The raceway grinding slide 310 is used to laterally adjust the position of the adjusting frame 320 to move closer to or further away from the raceway surface to be processed. The adjusting component 340 is used to adjust the tilt angle of the raceway grinding seat 330 relative to the raceway surface to be processed on the bearing steel ring, thereby achieving grinding operations on raceway surfaces at different angles.

[0047] like Figure 1 and Figure 9 As shown, the servo-driven mechanism includes a servo-driven spindle 500 located below the grinding station and a pressing assembly 400 located above the grinding station. The pressing assembly 400 is used to press against the top end face of the bearing steel ring. The pressing assembly 400 presses the top surface of the bearing steel ring onto the servo-driven spindle 500. Through the pressing operation, the servo-driven spindle 500 rotates at high speed, causing the flange grinding mechanism 200 and the raceway grinding mechanism 300 to perform processing operations on the left and right sides respectively, thereby achieving simultaneous processing of the flange and raceway.

[0048] Example 2

[0049] Based on the above solutions, such as Figure 2 , 4 As shown, the angle adjustment structure 240 includes a worm and a worm wheel mounted on the edge grinding seat 220. The worm and worm wheel cooperate, and a drive gear 242 is mounted on the rotating shaft of the worm wheel. An operating lever 241 is provided at one end of the worm. An arc-shaped rack 243 that meshes with the drive gear 242 is mounted on the edge grinding assembly 230. An arc-shaped slot 244 is mounted on the edge grinding seat 220, and a clamping bolt 245 is installed in the arc-shaped slot 244. The clamping bolt 245 is mounted on the edge grinding assembly 230. By rotating the operating lever 241, the arc-shaped rack 243 is rotated by the drive gear 242 at a certain angle. Due to the self-locking nature of the worm and worm wheel, the angle can remain relatively stable after adjustment. After adjusting the angle, in order to ensure the stability of the edge grinding assembly 230 relative to the edge grinding seat 220, the clamping bolt 245 is used to complete the position and angle restriction operation.

[0050] Example 3

[0051] Based on the above solutions, such as Figure 3 As shown, the edge grinding assembly 230 includes a first grinding drive assembly and an edge grinding assembly 231, and the raceway grinding assembly 350 includes a second grinding drive assembly and a raceway grinding assembly 351.

[0052] like Figures 6 to 8 As shown, both grinding drive assembly one and grinding drive assembly two are fixed bases 232. A servo motor 233 is mounted on the fixed base 232. An eccentric drive shaft 234 is mounted on the output end of the servo motor 233. One end of the eccentric drive shaft 234 is rotatably mounted on the fixed base 232. An eccentric sleeve 235, an adjusting sleeve 236 and a locking nut 237 are mounted on the eccentric drive shaft 234. A rolling element 238 is mounted on the outer side of the eccentric sleeve 235. The adjusting sleeve 236 is axially slidingly fitted on the eccentric drive shaft 234, and the side that contacts the eccentric sleeve 235 is an annular toothed surface. The locking nut 237 is used to press the adjusting sleeve 236 so that the corresponding ends of the eccentric sleeve 235 and the adjusting sleeve 236 contact each other and remain relatively stationary.

[0053] A movable frame 239 is fitted on the outer side of the rolling element 238. The movable frame 239 is slidably fitted on the fixed seat 232. The movable frame 239 is used to install the edge grinding assembly 231 or the raceway grinding assembly 351. A guide body 2310 is installed on the fixed seat 232, and one end of the guide body 2310 is inserted into the movable frame 239. An elastic body 2315 is fitted on the outer side of the guide body 2310.

[0054] Since the stroke of the moving frame 239 needs to be adjusted when processing flanges and raceway surfaces of different widths, the locking nut 237 is first unlocked to release the squeezing force on the adjusting sleeve 236. The adjusting sleeve 236 slides axially relative to the eccentric drive shaft 234, adjusting the angle of the eccentric sleeve 235 relative to the eccentric drive shaft 234 by a certain amount. Then, the angle of the eccentric sleeve 235 is limited by the annular toothed surface of the adjusting sleeve 236. Finally, the locking nut 237 is pressed and fixed, thereby completing the adjustment of the eccentricity and the stroke.

[0055] Example 4

[0056] Based on the above solutions, such as Figure 3 As shown, the edge grinding assembly 231 includes a mounting plate 2311 mounted on a movable frame 239 via a rotating shaft. The movable frame 239 has an angle adjustment groove 2312. The mounting plate 2311's angle relative to the movable frame 239 is limited by a locking bolt 2313 within the angle adjustment groove 2312. An adjusting screw 2314 is rotatably mounted on the movable frame 239. The adjusting screw 2314 is used to adjust the angle of the mounting plate 2311 relative to the movable frame 239. The mounting plate 2311 is used to mount the edge grinding component 2316. Loosening the locking bolt 2313 and then adjusting the screw 2314 adjusts the position and angle of the mounting plate 2311. After rotating the edge grinding component 2316 around the rotating shaft by a certain angle and adjusting it, the locking bolt 2313 is used to lock and fix it in place.

[0057] like Figure 3As shown, a long bolt 2317 is mounted on the mounting plate 2311. The end of the long bolt is connected to the edge grinding component 2316. The position of the edge grinding component 2316 relative to the mounting plate 2311 along the length of the long bolt 2317 is adjustable. The distance and position of the edge grinding component 2316 relative to the mounting plate 2311 can be adjusted by adjusting the long bolt 2317.

[0058] Example 5

[0059] Based on the above solutions, such as Figure 5 As shown, the adjustment assembly 340 includes an operating shaft 341, a worm shaft 342, and a worm gear seat 343. The operating shaft 341 is connected to the worm shaft 342 via gear transmission, and the worm shaft 342 is connected to the worm gear seat 343. The worm gear seat 343 is rotatably mounted on the adjustment frame 320 and fixed to the raceway grinding seat 330. The angle of the raceway grinding seat 330 is adjusted by adjusting the angle of the worm gear seat 343 via the operating shaft 341 through the gear and worm shaft 342, thereby solving the problem of adjusting the angle of the raceway grinding part 351 relative to the raceway surface.

[0060] Example 6

[0061] Based on the above solutions, such as Figure 9 As shown, the pressing assembly 400 includes a frame 410, with vertically arranged pressing slide plates 420 installed on both sides of the frame 410. A pressing cylinder 430 is installed on the top of the pressing slide plate 420. The piston end of the pressing cylinder 430 and the pressing slide plate 420 are connected. A pressing component 440 is installed on the pressing slide plate 420. The bottom of the pressing component 440 is provided with a socket body 441 that is inserted into the bearing steel ring and a pressing rolling element 442 (self-aligning bearing) that is pressed against the top surface of the bearing steel ring. The pressing cylinder 430 drives the pressing slide plate 420 and the pressing component 440 to move downward, and the bearing steel ring is pressed against the top surface of the top plate 506 of the servo electric drive spindle 500 by the pressing rolling element 442.

[0062] Example 7

[0063] Based on the above solutions, such as Figure 10 , 11 As shown, a rear positioning arc-shaped seat 501 is independently provided on the rear side of the servo electric drive spindle 500. The center of the rear positioning arc-shaped seat 501 is on the axis of the servo electric drive spindle 500. Two radially arranged adjusting support rollers 502 are installed on the rear positioning arc-shaped seat 501. The adjusting support rollers 502 are in contact with the surface of the bearing steel ring.

[0064] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. The substitutions may be replacements of some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made based on the technical solution and inventive concept of this utility model should all be covered within the protection scope of this utility model.

Claims

1. A device for ultra-precision grinding of raceway guard edges, characterized in that, include: The edge grinding mechanism (200) includes a transverse slide (210), an edge grinding seat (220) is mounted on the top of the transverse slide (210), and an edge grinding assembly (230) is mounted on the edge grinding seat (220) via an angle adjustment structure (240). The raceway grinding mechanism (300) includes a raceway grinding slide (310), an adjustment frame (320) is mounted on the top of the raceway grinding slide (310), a raceway grinding seat (330) and an adjustment component (340) for adjusting the angle of the raceway grinding seat (330) are mounted on the adjustment frame (320), and a raceway grinding component (350) is mounted on the raceway grinding seat (330). The servo electric drive mechanism includes a servo electric drive spindle (500) located in the area below the grinding station and a pressing assembly (400) located in the area above the grinding station. The pressing assembly (400) is used to press against the top end face of the bearing steel ring.

2. The ultra-precision grinding device for raceway flanges according to claim 1, characterized in that, The angle adjustment structure (240) includes a worm and a worm wheel mounted on the edge grinding seat (220). The worm and the worm wheel cooperate, and a drive gear (242) is mounted on the rotating shaft of the worm wheel. An operating lever (241) is provided at one end of the worm. An arc-shaped rack (243) that meshes with the drive gear (242) is mounted on the edge grinding assembly (230). An arc-shaped slot (244) is mounted on the edge grinding seat (220), and a clamping bolt (245) is installed in the arc-shaped slot (244). The clamping bolt (245) is mounted on the edge grinding assembly (230).

3. The ultra-precision grinding device for raceway flanges according to claim 1, characterized in that, The edge grinding assembly (230) includes a grinding drive assembly one and an edge grinding assembly (231), and the raceway grinding assembly (350) includes a grinding drive assembly two and a raceway grinding assembly (351); Both grinding drive assembly one and grinding drive assembly two are fixed bases (232). A servo motor (233) is mounted on the fixed base (232). An eccentric drive shaft (234) is mounted on the output end of the servo motor (233). One end of the eccentric drive shaft (234) is rotatably mounted on the fixed base (232). An eccentric sleeve (235), an adjusting sleeve (236) and a locking nut (237) are mounted on the eccentric drive shaft (234). A rolling element (238) is mounted on the outer side of the eccentric sleeve (235). The adjusting sleeve (236) is axially slidingly fitted on the eccentric drive shaft (234) and the side that contacts the eccentric sleeve (235) is an annular tooth surface. The locking nut (237) is used to press the adjusting sleeve (236) so that the corresponding ends of the eccentric sleeve (235) and the adjusting sleeve (236) contact each other and remain relatively stationary. A movable frame (239) is fitted on the outer side of the rolling element (238). The movable frame (239) is slidably fitted on the fixed seat (232). The movable frame (239) is used to install the flange grinding assembly (231) or the raceway grinding assembly (351). A guide body (2310) is installed on the fixed seat (232), and one end of the guide body (2310) is inserted into the movable frame (239). An elastic body (2315) is fitted on the outer side of the guide body (2310).

4. The ultra-precision grinding device for raceway flanges according to claim 3, characterized in that, The edge grinding assembly (231) includes a mounting plate (2311) mounted on a movable frame (239) via a rotating shaft. An angle adjustment groove (2312) is provided on the movable frame (239). The mounting plate (2311) limits the angle of the mounting plate (2311) relative to the movable frame (239) by a locking bolt (2313) in the angle adjustment groove (2312).

5. The ultra-precision grinding device for raceway flanges according to claim 4, characterized in that, An adjusting screw (2314) is rotatably mounted on the movable frame (239). The adjusting screw (2314) is used to adjust the angle of the mounting plate (2311) relative to the movable frame (239). The mounting plate (2311) is used to mount the edge grinding part (2316). A long bolt (2317) is mounted on the mounting plate (2311). The end of the long bolt is connected to the side grinding part (2316). The position of the side grinding part (2316) relative to the mounting plate (2311) along the length direction of the long bolt (2317) is adjustable.

6. The ultra-precision grinding device for raceway flanges according to claim 1, characterized in that, The adjustment assembly (340) includes an operating shaft (341), a worm shaft (342), and a worm wheel seat (343). The operating shaft (341) is connected to the worm shaft (342) via gear transmission. The worm shaft (342) and the worm wheel seat (343) are connected to each other via transmission. The worm wheel seat (343) is rotatably mounted on the adjustment frame (320) and fixed on the raceway grinding seat (330).

7. The ultra-precision grinding device for raceway flanges according to claim 1, characterized in that, The pressing assembly (400) includes a frame (410), and vertically arranged pressing slides (420) are installed on both sides of the frame (410). A pressing cylinder (430) is installed on the top of the pressing slide (420). The piston end of the pressing cylinder (430) and the pressing slide (420) are connected. A pressing component (440) is installed on the pressing slide (420). The bottom of the pressing component (440) is provided with a socket (441) inserted into the bearing steel ring and a pressing rolling element (442) pressed against the top surface of the bearing steel ring.

8. The ultra-precision grinding device for raceway flanges according to claim 1, characterized in that, The servo drive spindle (500) is independently provided with a rear positioning arc seat (501) on its rear side. The center of the rear positioning arc seat (501) is on the axis of the servo drive spindle (500). Two radially arranged adjustment support rollers (502) are installed on the rear positioning arc seat (501).

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