Internal grinding machine for machining precision bearing

Abstract

The invention belongs to the technical field of bearing grinding, and particularly relates to an internal grinding machine for machining precision bearings, which comprises a base table and a worktable mounted at the top of the base table, a fixed clamping component and an adjustable driving component are mounted in the worktable, and the output end of the driving component is connected with a grinding component. The grinding assembly comprises a grinding ring and a push plate, a grinding block is vertically and slidably installed in the grinding ring and connected with the push plate through a pull rope, the push plate is connected with the air cylinder, the grinding ring is connected with the transmission sleeve, a limiting block is installed on the push plate, and the limiting block abuts against the grinding block. A push plate is pushed through an air cylinder, the push plate moves to drive a limiting block to break away from limiting of a polishing block, at the moment, the push plate downwards pulls the polishing block through a pull rope, the polishing block is shrunk into a polishing ring, the overall diameter of a polishing assembly is reduced, the polishing assembly can be used for polishing the interior of a small-size inner circle more easily, and the situation that the polishing assembly collides with the inner circle and is damaged when moving is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of bearing grinding, and in particular relates to an internal grinding machine for machining precision bearings. Background Art

[0002] The inner circle of the bearing is an important component in the bearing that has a raceway and is used to support rolling elements. It is often used in power equipment because it needs to support the axial or radial load of the transmission shaft during the high-speed rotation of the bearing. Therefore, in order to reduce its wear during use and extend the service life of the bearing and improve its stability during operation, it has extremely high requirements for its processing accuracy.

[0003] Most of the grinding machines in the prior art use a grinding head to grind the inner wall of an inner circle. Since the sizes of the inner circles to be grinded are different, when the size of the inner circle is small, it is difficult for the grinding head to enter the inner circle. In addition, the grinding head is a wearable consumable, which causes the shape of the grinding head to change due to the different wear amounts when grinding the inner wall of the inner circle. At this time, if the outer diameter of the grinding head is used as the feed standard of the internal grinder, the grinding head is likely to hit the edge of the inner circle when entering the inner circle, thereby damaging the inner circle. Summary of the invention

[0004] The purpose of the present invention is to provide an internal grinding machine for machining precision bearings in view of the deficiencies of the prior art, so as to solve the technical problems in the prior art.

[0005] The purpose of the present invention can be achieved through the following technical solutions: an internal cylindrical grinder for processing precision bearings, which includes a base and a workbench installed on the top of the base, a fixed clamping assembly and an adjustable driving assembly are respectively installed in the workbench, the output end of the driving assembly is connected to the grinding assembly, the driving assembly includes a transmission sleeve and a cylinder, the cylinder is installed inside the transmission sleeve, the grinding assembly includes a grinding ring and a push plate, a grinding block is vertically slidably installed in the grinding ring, the grinding block is connected to the push plate by a pull rope, the push plate is connected to the cylinder, the grinding ring is connected to the transmission sleeve, a limit block is installed on the push plate, and the limit block presses the grinding block.

[0006] As a further optimization or improvement of this solution, the bottom of the grinding block is connected to the grinding ring via a return spring, and a pressure block is installed at the bottom of the grinding block.

[0007] As a further optimization or improvement of this solution, a shift assembly is installed on the workbench, and the shift assembly includes a longitudinal screw rod and a transverse screw rod. The longitudinal screw rod and the transverse screw rod are driven by a transmission box and a motor respectively, and the transmission box is installed on the drive assembly, and the transverse screw rod and the longitudinal screw rod are connected by a transmission block.

[0008] As a further optimization or improvement of the present solution, the grinding assembly also includes a chip collecting rubber ring, a moving wheel and a fixed frame. The chip collecting rubber ring, the moving wheel and the fixed frame are installed in sequence inside the grinding ring. The fixed frame is fixed on the push plate, and the moving wheel is installed inside the fixed frame. When the transmission sleeve drives the grinding ring to rotate, the chip collecting rubber ring, the moving wheel, the fixed frame and the push plate will rotate synchronously with the grinding ring.

[0009] As a further optimization or improvement of the present solution, the chip collecting rubber ring includes a plurality of chip collecting cavities and chip collecting ports thereon, and the grinding ring also includes a collecting cavity, which is arranged between the grinding blocks and is connected to the chip collecting port.

[0010] As a further optimization or improvement of the present solution, the grinding assembly also includes a transmission ring and a cam. The transmission ring is installed on the axis of the moving wheel, and a fixed cam is installed inside the transmission ring. When the transmission sleeve drives the grinding ring to rotate, the moving wheel and the transmission ring thereon rotate accordingly. When the transmission ring passes through the fixed and non-rotating cam, the moving wheel moves downward and squeezes the lower half of the chip collection rubber ring.

[0011] As a further optimization or improvement of this solution, the moving wheel is connected to the fixed frame via a connecting spring.

[0012] Beneficial effects of the present invention:

[0013] (1) The grinding assembly on the output end of the driving assembly is controlled by the shifting assembly to move toward the inner circle. When the grinding assembly approaches the inner wall of the inner circle, the cylinder is started. At this time, the cylinder pushes the push plate through the fixed frame. The movement of the push plate drives the limit block to break away from the limit of the grinding block. At this time, the push plate pulls the grinding block downward through the pull rope, so that the grinding block shrinks into the grinding ring, and the overall diameter of the grinding assembly is reduced, making it easier to carry out small-sized inner circles, avoiding the grinding assembly from hitting the inner circle and damaging it when moving.

[0014] (2) When the grinding block in the present invention contracts toward the inside of the grinding ring, the grinding block will drive the pressure block at the bottom thereof to press the chip collection cavity, so that the air inside the chip collection cavity is blown out through the chip collection port and the collection cavity. Since the grinding ring is close to the inner circle as a whole, the gas blown out from the chip collection cavity will blow off the dust and debris on the edge and inner wall of the inner circle, so that the chip collection cavity pre-cleans the inner circle. This avoids dust and debris being sandwiched between the grinding block and the inner wall of the inner circle, causing the grinding block to scratch the inner wall of the inner circle during the grinding process.

[0015] (3) When the debris produced by the grinding block of the present invention is thrown to the upper part of the grinding ring, the opening of the collecting chamber is gradually enlarged, so the debris can be accumulated in the collecting chamber. As the moving wheel rotates, the transmission ring on it will rotate synchronously. Since the cam is in a fixed state, the inner wall of the transmission ring will move downward as a whole when passing through the protruding part of the cam. The downward movement of the moving wheel will pull down the chip collecting chamber to deform it. At this time, the debris accumulated in the collecting chamber will be accelerated to enter the chip collecting chamber through the chip collecting port, so that the collecting chamber can collect the debris in the upper part of the grinding ring, thereby preventing the debris in the upper part of the grinding ring from being thrown between the grinding block and the inner wall of the inner circle and scratching the inner wall of the inner circle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is a front view of the overall structure of the present invention.

[0019] Figure 3 This is a schematic diagram of the connection between the drive assembly and the grinding assembly.

[0020] Figure 4 This is an exploded view of the overall structure of the polishing component.

[0021] Figure 5 It is a schematic diagram of the chip collecting rubber ring structure.

[0022] Figure 6 Schematic diagram of the contracted state of the grinding block.

[0023] Figure 7 For along Figure 6 Dashed line section view.

[0024] Figure 8 This is a schematic diagram of the pre-cleaning working state of the present invention.

[0025] Fig. 9 The present invention is a schematic diagram of the working state of collecting debris Figure 1 .

[0026] Fig.10 The present invention is a schematic diagram of the working state of collecting debris Figure 2 .

[0027] Fig.11 The present invention is a schematic diagram of the working state of collecting debris Figure 3 .

[0028] The following are marked in the figure: 1. base; 2. workbench; 3. shifting assembly; 31. transmission box; 32. longitudinal screw; 33. transverse screw; 34. transmission block; 35. motor; 4. driving assembly; 41. transmission sleeve; 42. cylinder; 5. clamping assembly; 51. clamping head; 6. grinding assembly; 61. grinding ring; 611. grinding block; 612. collecting chamber; 613. reset spring; 614. pressure block; 615. pull rope; 62. chip collecting rubber ring; 621. chip collecting chamber; 622. chip collecting port; 63. moving wheel; 64. fixed frame; 65. push plate; 66. limit block; 67. cam; 68. connecting spring; 69. transmission ring. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-Figure 6 A kind of internal cylindrical grinding machine for processing precision bearings, which includes a base 1 and a workbench 2 installed on the top of the base 1, a fixed clamping assembly 5 and an adjustable driving assembly 4 are respectively installed in the workbench 2, the output end of the driving assembly 4 is connected to the grinding assembly 6, the driving assembly 4 includes a transmission sleeve 41 and a cylinder 42, the cylinder 42 is installed inside the transmission sleeve 41, the grinding assembly 6 includes a grinding ring 61 and a push plate 65, a grinding block 611 is vertically slidably installed in the grinding ring 61, the grinding block 611 is connected to the push plate 65 through a pull rope 615, the push plate 65 is connected to the cylinder 42, the grinding ring 61 is connected to the transmission sleeve 41, a limit block 66 is installed on the push plate 65, and the limit block 66 presses the grinding block 611.

[0031] Specifically, the bottom of the grinding block 611 is connected to the grinding ring 61 via a return spring 613 , and a pressing block 614 is installed at the bottom of the grinding block 611 .

[0032] It should be noted that the use of the present invention is as follows:

[0033] In the first step, the inner circle to be polished is placed on the clamping assembly 5 and fixed by the clamping head 51, and then the driving motor 35 and the transmission box 31 adjust the position of the driving assembly 4;

[0034] In the second step, the grinding assembly 6 on the output end of the driving assembly 4 is controlled by the shifting assembly 3 to move toward the inner circle. When the grinding assembly 6 approaches the inner wall of the inner circle, the cylinder 42 is started. At this time, the cylinder 42 pushes the push plate 65 through the fixed frame 64. Figure 6As shown, the push plate 65 moves to drive the limit block 66 to break away from the limit of the grinding block 611. At this time, the push plate 65 pulls the grinding block 611 downward through the pull rope 615, so that the grinding block 611 shrinks into the grinding ring 61, so that the overall diameter of the grinding assembly 6 is reduced, making it easier to perform small-sized inner circles, and avoiding the grinding assembly 6 from hitting the inner circle and causing damage when moving;

[0035] The third step is Figure 6 and Figure 8 As shown, when the grinding block 611 contracts toward the inside of the grinding ring 61, the grinding block 611 will drive the pressing block 614 at the bottom thereof to press the chip collecting cavity 621, so that the air inside the chip collecting cavity 621 is blown out through the chip collecting port 622 and the collecting cavity 612. Since the grinding ring 61 is close to the inner circle as a whole, the gas blown out from the chip collecting cavity 621 will blow off the dust and debris on the edge and inner wall of the inner circle, so that the chip collecting cavity 621 pre-cleans the inner circle. This prevents dust and debris from being sandwiched between the grinding block 611 and the inner wall of the inner circle, causing the grinding block 611 to scratch the inner wall of the inner circle during the grinding process.

[0036] Step 4: After the inner circle of the grinding ring 61 is formed, the cylinder 42 pulls the push plate 65 toward the transmission sleeve 41 through the fixed frame 64. At this time, the grinding block 611 is reset under the action of the reset spring 613. At the same time, the push plate 65 drives the limit block 66 to press the grinding block 611 to limit it, and the pressure block 614 also returns to its initial position.

[0037] In the fifth step, the driving assembly 4 is started, and the driving assembly 4 drives the grinding ring 61 to rotate through the transmission sleeve 41. The grinding ring 61 will drive the chip collecting rubber ring 62, the moving wheel 63, the fixed frame 64 and the push plate 65 to rotate synchronously. At this time, the grinding block 611 on the grinding ring 61 grinds the inner wall of the inner circle. When the grinding debris is thrown to the upper half of the grinding ring 61, the opening of the collection chamber 612 is gradually increased, so the debris can be accumulated in the collection chamber 612; as the moving wheel 63 rotates, the transmission ring 69 on it will be driven to rotate synchronously. Since the cam 67 is in a fixed state, when the inner wall of the transmission ring 69 passes through the protruding part of the cam 67, the moving wheel 63 will move downward as a whole, for example Figure 9-10 The downward movement of the moving wheel 63 will pull down the chip collecting cavity 621 to deform it. At this time, the debris accumulated in the collecting cavity 612 will be accelerated into the chip collecting cavity 621 through the chip collecting opening 622, so that the collecting cavity 612 collects the debris in the upper half of the grinding ring 61, and prevents the debris in the upper half of the grinding ring 61 from being thrown between the grinding block 611 and the inner wall of the inner circle and scratching the inner wall of the inner circle; as the grinding ring 61 rotates, the chip collecting cavity 621 with the debris rotates to the lower half of the grinding ring 61, for example Figure 10-11 Under the action of the moving wheel 63, the moving wheel 63 squeezes the chip collecting cavity 621, so that the debris inside the chip collecting cavity 621 is discharged.

[0038] See also Figure 1 A shift assembly 3 is installed on the workbench 2, and the shift assembly 3 includes a longitudinal screw rod 32 and a transverse screw rod 33. The longitudinal screw rod 32 and the transverse screw rod 33 are driven by a transmission box 31 and a motor 35 respectively, and the transmission box 31 is installed on the driving assembly 4, and the transverse screw rod 33 and the longitudinal screw rod 32 are connected by a transmission block 34.

[0039] It should be noted that the transmission box 31 and the longitudinal screw rod 32 cooperate to drive the driving assembly 4 to push, the transverse screw rod 33 and the motor 35 cooperate to drive the driving assembly 4 to move horizontally, and the longitudinal screw rod 32 and the transverse screw rod 33 are transmitted and cooperated through the transmission block 34.

[0040] See also Figure 3-Figure 7 The grinding assembly 6 also includes a chip collecting rubber ring 62, a moving wheel 63 and a fixed frame 64. The chip collecting rubber ring 62, the moving wheel 63 and the fixed frame 64 are installed in sequence inside the grinding ring 61. The fixed frame 64 is fixed on the push plate 65, and the moving wheel 63 is installed inside the fixed frame 64; when the transmission sleeve 41 drives the grinding ring 61 to rotate, the chip collecting rubber ring 62, the moving wheel 63, the fixed frame 64 and the push plate 65 will rotate synchronously with the grinding ring 61.

[0041] Specifically, the chip collecting rubber ring 62 includes a plurality of chip collecting cavities 621 and chip collecting ports 622 thereon, and the grinding ring 61 also includes a collecting cavity 612 . The collecting cavity 612 is arranged between the grinding blocks 611 , and the collecting cavity 612 is communicated with the chip collecting port 622 .

[0042] Specifically, the grinding assembly 6 also includes a transmission ring 69 and a cam 67. The transmission ring 69 is installed on the axis of the moving wheel 63, and a fixed cam 67 is installed inside the transmission ring 69. When the transmission sleeve 41 drives the grinding ring 61 to rotate, the moving wheel 63 and the transmission ring 69 thereon rotate accordingly. When the transmission ring 69 passes through the fixed cam 67, the moving wheel 63 moves downward and squeezes the lower half of the chip collecting rubber ring 62.

[0043] Specifically, the moving wheel 63 is connected to the fixing frame 64 via a connecting spring 68 .

[0044] It should be noted that when the driving component 4 drives the grinding block 611 to grind the inner wall of the inner circle, the clamping component 5 will drive the inner circle to rotate, thereby accelerating the grinding efficiency of the inner circle by the grinding block 611. However, the rotation of the clamping component 5 will drive the debris generated by the grinding block 611 to swing along the inner wall of the inner circle, and it is very easy to throw the debris onto the grinding ring 61, causing the debris to be sandwiched between the grinding block 611 and the inner wall of the inner circle, thereby easily scratching the inner wall of the inner circle.

[0045] It should be noted that, since the grinding ring 61 is in a rotating state when the grinding block 611 is grinding the inner wall of the inner circle, the debris polished by the grinding block 611 will only splash onto the upper part of the grinding ring 61. If the lower part of the grinding ring 61 is splashed with debris, the grinding ring 61 will throw the debris off under the action of rotational inertia and gravity.

[0046] When the inner wall of the inner circle is polished by the present invention, Figure 9-11 As shown, when the grinding debris is thrown to the upper half of the grinding ring 61, the debris can be accumulated in the collecting chamber 612 because the opening of the collecting chamber 612 is gradually enlarged; as the moving wheel 63 rotates, the transmission ring 69 on it will rotate synchronously. Since the cam 67 is in a fixed state, when the inner wall of the transmission ring 69 passes through the protruding part of the cam 67, the moving wheel 63 will move downward as a whole, for example Figure 9-10 The downward movement of the moving wheel 63 will pull down the chip collecting cavity 621 to deform it. At this time, the debris accumulated in the collecting cavity 612 will be accelerated into the chip collecting cavity 621 through the chip collecting opening 622, so that the collecting cavity 612 collects the debris in the upper half of the grinding ring 61, and prevents the debris in the upper half of the grinding ring 61 from being thrown between the grinding block 611 and the inner wall of the inner circle and scratching the inner wall of the inner circle; as the grinding ring 61 rotates, the chip collecting cavity 621 with the debris rotates to the lower half of the grinding ring 61, for example Figure 10-11 Under the action of the moving wheel 63, the moving wheel 63 squeezes the chip collecting cavity 621, so that the debris inside the chip collecting cavity 621 is discharged.

[0047] Since the chip collecting chamber 621 needs to continuously collect the grinding chips thrown on the upper half of the grinding ring 61, if the chips are not discharged from the chip collecting chamber 621 in time, as the grinding ring 61 rotates, the collection chamber 612 will throw out the chips inside it under the action of rotational inertia, aggravating the splashing of inner circle chips.

[0048] The implementation principle of the present invention is: the inner circle to be polished is placed on the clamping assembly 5 and clamped and fixed by the clamping head 51 , and then the driving motor 35 and the transmission box 31 adjust the position of the driving assembly 4 .

[0049] The grinding assembly 6 on the output end of the driving assembly 4 is controlled by the shifting assembly 3 to move toward the inner circle. When the grinding assembly 6 approaches the inner wall of the inner circle, the cylinder 42 is started. At this time, the cylinder 42 pushes the push plate 65 through the fixed frame 64. Figure 6 As shown, the push plate 65 moves to drive the limit block 66 to disengage from the limit on the grinding block 611. At this time, the push plate 65 pulls the grinding block 611 downward through the pull rope 615, so that the grinding block 611 shrinks into the grinding ring 61, and the overall diameter of the grinding component 6 is reduced, making it easier to perform small-sized inner circles, and avoiding the grinding component 6 from hitting the inner circle and damaging it when moving.

[0050] like Figure 6 and Figure 8 As shown, when the grinding block 611 shrinks toward the inside of the grinding ring 61, the grinding block 611 will drive the pressure block 614 at its bottom to press the chip collecting chamber 621, so that the air inside the chip collecting chamber 621 is blown out through the chip collecting port 622 and the collecting chamber 612. Since the grinding ring 61 is close to the inner circle as a whole, the gas blown out from the chip collecting chamber 621 will blow off the dust and debris on the edge and inner wall of the inner circle, so that the chip collecting chamber 621 can pre-clean the inner circle. Avoid dust and debris being caught between the grinding block 611 and the inner wall of the inner circle, which may cause the grinding block 611 to scratch the inner wall of the inner circle during the grinding process; after the grinding ring 61 is polished, the cylinder 42 pulls the push plate 65 toward the transmission sleeve 41 through the fixed frame 64. At this time, the grinding block 611 is reset under the action of the reset spring 613. At the same time, the push plate 65 drives the limit block 66 to press the grinding block 611 to limit it, and the pressure block 614 also returns to its initial position.

[0051] The driving assembly 4 is started, and the driving assembly 4 drives the grinding ring 61 to rotate through the transmission sleeve 41. The grinding ring 61 will drive the chip collecting rubber ring 62, the moving wheel 63, the fixed frame 64 and the push plate 65 to rotate synchronously. At this time, the grinding block 611 on the grinding ring 61 grinds the inner wall of the inner circle. When the grinding debris is thrown to the upper half of the grinding ring 61, the opening of the collection chamber 612 is gradually increased, so the debris can be accumulated in the collection chamber 612; as the moving wheel 63 rotates, the transmission ring 69 on it will be driven to rotate synchronously. Since the cam 67 is in a fixed state, when the inner wall of the transmission ring 69 passes through the protruding part of the cam 67, the moving wheel 63 will move downward as a whole, for example Figure 9-10 The downward movement of the moving wheel 63 will pull down the chip collecting cavity 621 to deform it. At this time, the debris accumulated in the collecting cavity 612 will be accelerated into the chip collecting cavity 621 through the chip collecting opening 622, so that the collecting cavity 612 collects the debris in the upper half of the grinding ring 61, and prevents the debris in the upper half of the grinding ring 61 from being thrown between the grinding block 611 and the inner wall of the inner circle and scratching the inner wall of the inner circle; as the grinding ring 61 rotates, the chip collecting cavity 621 with the debris rotates to the lower half of the grinding ring 61, for example Figure 10-11 Under the action of the moving wheel 63, the moving wheel 63 squeezes the chip collecting cavity 621, so that the debris inside the chip collecting cavity 621 is discharged.

[0052] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. An internal grinding machine for machining precision bearings, characterized in that: The invention comprises a base (1) and a workbench (2) installed on the top of the base (1), wherein a fixed clamping assembly (5) and an adjustable driving assembly (4) are respectively installed in the workbench (2), and the output end of the driving assembly (4) is connected to a grinding assembly (6), wherein the driving assembly (4) comprises a transmission sleeve (41) and a cylinder (42), wherein the cylinder (42) is installed inside the transmission sleeve (41), and the grinding assembly (6) comprises a grinding ring (61) and a push plate (65), wherein a grinding block (611) is vertically slidably installed inside the grinding ring (61), and the grinding block (611) is connected to the push plate (65) via a pull rope (615), wherein the push plate (65) is connected to the cylinder (42), and the grinding ring (61) is connected to the transmission sleeve (41), and a limit block (66) is installed on the push plate (65), and the limit block (66) presses against the grinding block (611).

2. An internal grinding machine for machining precision bearings according to claim 1, characterized in that: The bottom of the grinding block (611) is connected to the grinding ring (61) via a return spring (613), and a pressing block (614) is installed at the bottom of the grinding block (611).

3. The internal grinding machine for machining precision bearings according to claim 1, characterized in that: A shift assembly (3) is installed on the workbench (2), and the shift assembly (3) comprises a longitudinal screw rod (32) and a transverse screw rod (33). The longitudinal screw rod (32) and the transverse screw rod (33) are driven by a transmission box (31) and a motor (35) respectively, and the transmission box (31) is installed on the driving assembly (4). The transverse screw rod (33) and the longitudinal screw rod (32) are connected via a transmission block (34).

4. The internal grinding machine for machining precision bearings according to claim 1, characterized in that: The grinding assembly (6) further comprises a chip collecting rubber ring (62), a moving wheel (63) and a fixed frame (64); the chip collecting rubber ring (62), the moving wheel (63) and the fixed frame (64) are sequentially installed inside the grinding ring (61); the fixed frame (64) is fixed on the push plate (65), and the moving wheel (63) is installed inside the fixed frame (64); when the transmission sleeve (41) drives the grinding ring (61) to rotate, the chip collecting rubber ring (62), the moving wheel (63), the fixed frame (64) and the push plate (65) will rotate synchronously with the grinding ring (61).

5. An internal grinding machine for machining precision bearings according to claim 4, characterized in that: The chip collecting rubber ring (62) comprises a plurality of chip collecting cavities (621) and chip collecting ports (622) thereon, and the grinding ring (61) further comprises a collecting cavity (612), wherein the collecting cavity (612) is arranged between the grinding blocks (611), and the collecting cavity (612) is communicated with the chip collecting port (622).

6. An internal grinding machine for machining precision bearings according to claim 5, characterized in that: The grinding assembly (6) further comprises a transmission ring (69) and a cam (67). The transmission ring (69) is mounted on the axis of the moving wheel (63), and a fixed cam (67) is mounted inside the transmission ring (69). When the transmission sleeve (41) drives the grinding ring (61) to rotate, the moving wheel (63) and the transmission ring (69) thereon rotate accordingly. When the transmission ring (69) passes the fixed cam (67), the moving wheel (63) moves downward and squeezes the lower half of the chip collecting rubber ring (62).

7. An internal grinding machine for machining precision bearings according to claim 6, characterized in that: The moving wheel (63) is connected to the fixed frame (64) via a connecting spring (68).

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