High-speed grinding machine for bearing roller way

Abstract

The invention relates to the technical field of machining, in particular to a high-speed grinding machine for a bearing roller way, an online electrolytic dressing module is arranged on one side of a grinding wheel, and rotation and axial reciprocating motion of a conductive column are matched with a spiral conductive structure, so that dressing is synchronously completed in the grinding process of the grinding wheel, and discharging positions are dispersed in the axial direction of the grinding wheel; meanwhile, a grinding fluid circulating system and a movable filtering module are arranged, powder in grinding fluid is collected in a classified mode, and through alternate work of a main filter screen and an auxiliary filter screen, the problems of attachment of the grinding powder and filtering blockage are solved, frequent replacement of the filter screens is avoided, and the grinding wheel sharpening uniformity, the grinding machining stability and the bearing machining consistency are improved.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and in particular to a high-speed grinding machine for bearing rollers. Background Technology

[0002] Bearings are critical basic components in mechanical equipment, playing a vital role in supporting rotating bodies, reducing friction, and ensuring rotational accuracy. To ensure stable equipment operation, bearings require regular maintenance and even batch replacement, which places high demands on the consistency of machining and the predictability of lifespan for bearings in the same batch. Grinding with abrasive wheels is involved throughout the entire bearing machining process, and the condition of the abrasive wheel directly affects the surface quality and precision of the bearing; dulling of the abrasive grains can easily lead to problems such as vibration and burning. Electrolytic dressing of the grinding wheel can restore the effective grinding edge and chip removal space, thereby ensuring the stability and consistency of bearing machining quality.

[0003] Existing grinding wheel dressing devices often result in grinding powder adhering to the electrolytic electrodes, affecting the uniformity of electrode discharge and the dressing effect. In order to avoid wasting grinding fluid, existing bearing grinding machines are usually equipped with grinding fluid recovery devices. These devices contain filters to remove grinding powder from the fluid. However, because the filters are fixed in place, debris in the coolant is easily trapped in the filter pores during filtration, causing blockage and requiring frequent cleaning.

[0004] Based on the above-mentioned technical problems, the present invention proposes a high-speed grinding machine for bearing rollers. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a high-speed grinding machine for bearing rollers to solve the above-mentioned technical problems.

[0006] The present invention is achieved through the following technical solution: a high-speed bearing roller grinding machine, including a bed, an installation platform fixedly mounted on the bed, a measuring device, a first spindle, a second spindle and an electromagnetic clamp for fixing the bearing to be ground on the installation platform;

[0007] The first spindle is used to drive the grinding wheel. An online sharpening module for electrolytic sharpening of the grinding wheel is provided on the shaft box on one side of the grinding wheel. The online sharpening module includes a discharge sharpening unit, a conductive rotation unit, an electrolyte circulation unit, and a reciprocating motion unit that drives the conductive column to move axially back and forth. A grinding fluid circulation system is provided on the side of the first spindle. The system includes a supply tank, a return tank, a connecting pipe between the two, and a grinding fluid filtration module. The grinding fluid filtration module includes a housing, a grinding fluid flow channel inside the housing, a slidable filter assembly inside the housing, a powder collection assembly fixedly arranged below the housing, and a drive assembly for driving the filter assembly to move within the housing.

[0008] Furthermore, the discharge sharpening unit includes a positive electrode for electric sparking that is slidably disposed above the grinding wheel and in contact with the conductive shaft of the grinding wheel, and a negative electrode for electric sparking that is fixedly disposed on the shaft box for forming a discharge circuit during the grinding wheel sharpening process.

[0009] Furthermore, the conductive rotating unit includes an arc-shaped outer shell disposed near the working surface of the grinding wheel, and a conductive column rotatably disposed within the arc-shaped outer shell. The conductive column is mounted on the shaft box by a mounting block, and its surface is provided with a threaded conductive structure to realize multi-point tip discharge. The threaded conductive structure is electrically connected to the negative electrode of the electric spark through a brush. Furthermore, the reciprocating motion unit includes a spring assembly disposed on the back of the mounting block and a drive assembly disposed at the center of the conductive post, the spring assembly being connected to the conductive post; it also includes an insulating guide strip disposed at an incline below the conductive post, the insulating guide strip having a protrusion that engages with the threaded conductive structure on the surface of the conductive post, and an elastic telescopic structure at its bottom, the end of the insulating guide strip having a wedge-shaped surface that engages with the conductive post; the drive assembly includes a drive rod for driving the conductive post to rotate, the drive rod being slidably disposed inside the conductive post.

[0010] Furthermore, the electrolyte circulation unit is located below the conductive column, including an electrolyte nozzle that is tilted upward toward the working surface of the grinding wheel, an adsorption and recovery device located below the conductive column and closely attached to the inner wall of the arc-shaped outer shell, and an electrolyte circulation port is provided at the bottom of the arc-shaped outer shell.

[0011] Furthermore, the filter assembly includes a main filter device and a secondary filter device that are slidably arranged along the flow direction axis; the main filter device includes a mounting plate and a main filter screen symmetrically arranged on both sides of the mounting plate and rotatably connected to the mounting plate, and a coil spring is provided between the main filter screen and the mounting plate so that the main filter screen unfolds toward the inner wall of the housing in its natural state.

[0012] Furthermore, the secondary filtration device includes a slidably disposed secondary filter screen, which is connected to the mounting plate via a rod, and a spring telescopic rod is provided between the secondary filter screen and the rod.

[0013] Furthermore, the mounting plate has a magnetic block on the liquid outlet side of the main filter screen, and a gap is reserved between the magnetic block and the main filter screen; the magnetic block is connected to the mounting plate through a spring telescopic rod one, the main rod of the spring telescopic rod one is fixedly connected to the magnetic block, and the end of the spring telescopic rod one is fixedly connected to the drive assembly; the elastic coefficient of the spring telescopic rod two is equal to the elastic coefficient of the spring telescopic rod one, and the elastic coefficient of the spring telescopic rod two is less than the elastic coefficient of the coil spring.

[0014] Furthermore, the powder collection assembly includes a non-magnetic collection chamber and a magnetic collection chamber distributed along the flow direction; the non-magnetic collection chamber is located in front of the electrolyte outlet pipe, and the magnetic collection chamber is located behind the electrolyte outlet pipe; funnel-shaped powder overflow prevention baffles are provided at the openings of the non-magnetic collection chamber and the magnetic collection chamber.

[0015] Furthermore, the housing is provided with a limiting structure, which includes a first stop for limiting the extreme position of the secondary filter screen and a second stop for limiting the extreme position of the main filter screen; the first stop is located on the inner wall side of the housing behind the grinding fluid inlet; the second stop is located on the inner wall side of the housing above the magnetic collection chamber.

[0016] The beneficial effects of this invention are as follows: A high-speed bearing roller grinding machine includes a bed, on which a mounting platform is fixedly installed. A measuring device, a first spindle, a second spindle, and an electromagnetic clamp for fixing the bearing to be ground are provided on the mounting platform. The first spindle drives a grinding wheel. An online sharpening module for electrolytic sharpening of the grinding wheel is installed on a shaft box on one side of the grinding wheel. The online sharpening module includes a discharge sharpening unit, a conductive rotation unit, an electrolyte circulation unit, and a reciprocating motion unit that drives the conductive column to move axially back and forth. This invention, by installing an online electrolytic sharpening module on one side of the grinding wheel, enables the grinding wheel to be sharpened synchronously during bearing grinding, and the rotation and axial reciprocating motion of the conductive column, in conjunction with the surface of the grinding wheel, achieves this. The spiral conductive structure disperses the discharge area along the grinding wheel axis, thereby improving the uniformity of electrolytic sharpening and suppressing discharge accumulation at the grinding wheel edge. Simultaneously, the rotation of the conductive pillars and the circulation of the electrolyte create continuous disturbance in the sharpening area, effectively reducing the adhesion of grinding powder to the electrodes and the sharpening area, ensuring a continuous and stable sharpening process. Furthermore, by incorporating a movable grinding fluid filter assembly and main and auxiliary filter devices, along with the separate collection of magnetic and non-magnetic powders, backwashing the filter screen without disassembling the filter equipment effectively reduces filter module clogging, decreases the frequency of filter module replacement, and improves the cleanliness and operational reliability of the grinding fluid circulation system, thus enhancing the overall stability and consistency of bearing grinding. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall device; Figure 2This is a schematic diagram of the position of the first spindle; Figure 3 This is a schematic diagram showing the location of the online sharpening device; Figure 4 This is a schematic diagram of a conductive pillar structure; Figure 5 This is a schematic diagram of the cross-section of the conductive column; Figure 6 for Figure 3 Enlarged view of point A in the middle; Figure 7 This is a schematic diagram showing the location of the grinding fluid filtration module; Figure 8 This is a cross-sectional schematic diagram of the grinding fluid filtration module; Figure 9 A schematic diagram of the main filtration device.

[0018] In the diagram: 1. Bed; 11. Mounting platform; 12. Measuring device; 13. Second spindle; 14. Electromagnetic clamp; 2. First spindle; 21. Grinding wheel; 22. Positive EDM electrode; 23. Negative EDM electrode; 3. Online sharpening module; 31. Arc-shaped shell; 32. Conductive post; 33. Insulating guide strip; 34. Electrolyte nozzle; 35. Absorbent sponge; 36. Drive rod; 37. Slide drive block; 4. Supply tank; 41. Return tank; 42. Electric push rod; 43. Magnetic collection chamber; 44. Non-magnetic collection chamber; 5. Grinding fluid filtration module; 51. Housing; 52. Connecting rod; 53. Spring telescopic rod II; 54. Secondary filter screen; 55. Stop block I; 56. Stop block II; 6. Mounting plate; 61. Main filter screen; 62. Coil spring; 63. Spring telescopic rod II; 64. Magnetic block. Detailed Implementation

[0019] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1 like Figure 1-9 As shown, this embodiment discloses a high-speed grinding machine for bearing rollers, including a bed 1, an installation platform 11 fixedly installed on the bed 1, and a measuring device 12, a first spindle 2, a second spindle 13, and an electromagnetic clamp 14 installed on the installation platform 11. The electromagnetic clamp 14 is used to fix the bearing to be ground. The electromagnetic clamp 14 is slidably mounted on the mounting platform 11, and a guide rail and screw drive device are installed between the electromagnetic clamp 14 and the mounting platform 11. The guide rail and screw drive device are mounted on the mounting platform 11.

[0022] The measuring device 12 installed on the mounting platform 11 is used to collect data, and a leveling and height adjustment device is installed at the bottom of the measuring device 12.

[0023] like Figure 2-3 The first spindle 2, mounted on the mounting platform 11, drives the grinding wheel 21. A horizontal adjustment device, a lead screw slide structure, is installed below the first spindle 2. The grinding wheel 21 is fixedly connected to the first spindle 2 via a grinding wheel conductive shaft, and an insulation device is provided between the grinding wheel conductive shaft and the first spindle 2. An EDM positive electrode 22, which is a wear-resistant brush, is mounted on the grinding wheel conductive shaft. The EDM positive electrode 22 is slidably connected to the shaft box, and a spring is installed above the EDM positive electrode 22 to ensure a tight fit between the EDM positive electrode 22 and the grinding wheel conductive shaft. An EDM negative electrode 23, made of copper, is fixedly mounted on the shaft box on one side of the grinding wheel 21. An insulating mounting plate is provided between the shaft box and the EDM negative electrode 23.

[0024] like Figure 3-6An online sharpening module 3 is installed on the negative electrode 23 of the EDM on one side of the grinding wheel 21. The online sharpening module 3 includes an arc-shaped shell 31, which is fixedly installed on the headstock and close to the working surface of the grinding wheel 21. A conductive post 32 is installed inside the arc-shaped shell 31. The conductive post 32 is installed on the headstock through a mounting block 24. The conductive post 32 is rotatably connected to the mounting block. A brush is installed between the conductive post 32 and the mounting block 24. The conductive post 32 is connected to the negative electrode 23 of the EDM through the brush. A spring assembly is installed on the back of the mounting block 24. The spring assembly is rotatably connected to the conductive post 32. A drive rod 36 is installed inside the conductive post 32. The drive rod 36 is connected to an external drive, which is a stepper motor. The external drive is connected to the drive rod 36 through a coupling. The outer end of the drive rod 36 extends to the outside of the conductive post 32. The outer end of the drive rod 36 is rotatably connected to the mounting block 24. A sliding drive block 37 is installed between the inner end of the drive rod 36 and the conductive post 32. The drive rod 36 is slidably installed in the sliding groove of the sliding drive block 37. The sliding drive block 37 is non-conductive and is fixedly connected to the conductive post 32. The conductive post 32 has a uniform threaded conductive structure on its surface, forming a uniform multi-point tip discharge between the thread edge and the working surface of the grinding wheel 21. An insulating block is fixedly installed at the outer end of the conductive post 32. An insulating guide strip 33 is installed below the conductive post 32. The insulating guide strip 33 is installed at a downward angle and has uniform protrusions on it. The protrusions can scrape off the grinding powder adhering to the surface of the conductive post. An elastic telescopic rod is installed at the bottom of the insulating guide strip 33. The end of the insulating guide strip 33 has a wedge-shaped surface that contacts the insulating block.

[0025] An adsorption and recovery device is installed between the arc-shaped outer shell 31 below the conductive post 32 and the grinding wheel 21. This device includes a micro-nano adsorption sponge 35 and an electrolyte nozzle 34, which is installed at an upward angle towards the grinding wheel 21. The electrolyte is a weakly conductive electrolyte used for EDM sharpening. The adsorption sponge 35 is positioned close to the inner wall of the arc-shaped outer shell 31 to absorb excess electrolyte and impurities generated during grinding, preventing them from splashing. An electrolyte circulation port is located at the bottom of the arc-shaped outer shell 31, and a collection container is installed below the electrolyte drain port to collect excess electrolyte discharged from the arc-shaped outer shell 31 for recycling.

[0026] When sharpening the grinding wheel 21, the electrolyte nozzle 34 sprays electrolyte onto the grinding wheel 21. The grinding wheel 21 rotates upward carrying the electrolyte. When it is above the center of the grinding wheel 21, a portion of the electrolyte flows downward under the action of gravity, wetting the entire surface of the grinding wheel 21. When the conductive post 32 is driven by the external drive rod 36 to rotate, it achieves axial displacement through the threaded pair structure and stores force for the spring assembly, and can also scrape off the dust adhering to the surface of the conductive post 32. When the conductive post 32 presses against the wedge-shaped surface of the insulating guide strip 33, the insulating guide strip 33 moves downward, causing the protrusion to disengage from the threaded groove on the surface of the conductive post 32. The conductive post 32 is reset under the action of the spring assembly. During the sharpening process of the grinding wheel 21, the conductive post 32 reciprocates within a specific range of motion. The threaded conductive structure on the surface of the conductive post 32 forms a uniform tip discharge phenomenon between itself and the working surface of the grinding wheel 21, which can effectively remove the bonding agent between the abrasive grains on the surface of the grinding wheel 21, making the abrasive grains protrude, thereby achieving the purpose of sharpening the grinding wheel. During the sharpening process, the grinding wheel 21 rotates, and some of the electrolyte and grinding dust are thrown towards the inner wall of the arc-shaped outer shell 31 under the action of centrifugal force. Under the action of gravity, the electrolyte flows down the inner wall of the arc-shaped outer shell 31 and flows through the conductive column 32. Due to the inclined installation of the insulating guide strip 33, the electrolyte will flow down along the insulating guide strip 33 to the surface of the adsorption sponge 35. The dust and debris are isolated by the adsorption sponge 35, and the electrolyte enters the electrolyte collection device through the sponge.

[0027] like Figure 7-9 As shown, a liquid supply tank 4 is installed on the side of the first spindle 2. The liquid supply tank 4 is connected to the bottom of the return tank 41 through a pipe. A grinding fluid filter module 5 is installed between the return tank 41 and the liquid supply tank 4.

[0028] The grinding fluid filtration module 5 includes a housing 51, which is fixedly connected to the fluid supply pipeline via a flange. A filter assembly is installed inside the housing 51, a powder collection assembly is installed at the bottom of the housing 51, and a drive assembly is installed at the end of the housing 51.

[0029] The filtration assembly includes a main filtration unit and a secondary filtration unit. The main filtration unit includes a mounting plate 6, on which main filter screens 61 are symmetrically mounted. The frame of the main filter screen 61 is made of metal. The main filter screen 61 and the mounting plate 6 are rotatably connected via a pivot. When the main filter screen 61 is unfolded, its outer diameter is equal to the inner diameter of the housing 51. A coil spring 62 is installed between the main filter screen 61 and the mounting plate 6. Under the action of the coil spring 62, the main filter screen 61 is in a vertically unfolded state, with its edges tightly against the inner wall of the housing 51. A magnetic block 64 is installed behind the bottom main filter screen 61. The top of the magnetic block 64 is tightly against the frame of the main filter screen 61, and a liquid passage gap is reserved between the magnetic block 64 and the main filter screen 61. A spring telescopic rod 63 is installed between the magnetic block 64 and the main filter screen 61. The main rod of the spring telescopic rod 63 is fixedly connected to the magnetic block 64, and the secondary rod is fixedly connected to the main filter screen 61.

[0030] The secondary filtration device includes a secondary filter screen 54. The frame of the secondary filter screen 54 is made of metal. The secondary filter screen 54 is slidably installed inside the housing 51. The outer diameter of the secondary filter screen 54 is equal to the inner diameter of the housing 51. During operation, the secondary filter screen 54 is in close contact with the end wall of the device. A connecting rod 52 is installed between the mounting plate 6 and the secondary filter screen 54. One end of the connecting rod 52 is fixedly connected to the mounting plate 6, and the other end is connected to the secondary filter screen 54 via a second spring telescopic rod 53. The elastic coefficient of the second spring telescopic rod 53 is equal to that of the first spring telescopic rod 63. The second spring telescopic rod 53 is rotatably connected to the secondary filter screen 54. A coil spring is installed between the second spring telescopic rod 53 and the secondary filter screen 54. Under the force of the coil spring, the secondary filter screen 54 tilts downward.

[0031] The drive assembly includes an electric push rod 42, and the bottom of the main rod of a spring telescopic rod 63 is fixedly connected to the working end of the electric push rod 42. When the electric push rod 42 drives the main filter screen 61 to move, the spring force of the spring telescopic rod 63 is greater than the frictional force between the main filter screen 61 and the pipe wall.

[0032] like Figure 8 The powder collection assembly shown, installed below the housing 51, includes a magnetic collection chamber 43 and a non-magnetic collection chamber 44. The non-magnetic collection chamber 44 is located in front of the grinding fluid outlet, while the magnetic collection chamber 43 is located behind the grinding fluid outlet. Funnel-shaped baffles are installed at the powder inlets of both the magnetic and non-magnetic collection chambers 43 to prevent powder from escaping. When the grinding fluid filtration module 5 is operating, the main filter screen 61 is positioned at the collection port of the non-magnetic collection chamber 44. When magnetic powder needs to be collected, the electric push rod 42 drives the main filter to move to the collection port of the magnetic collection chamber 43.

[0033] A first baffle 55 and a second baffle 56 are fixedly installed on the inner wall of the housing 51. The first baffle 55 is installed at the straight pipe behind the grinding fluid inlet, and the second baffle 56 is installed on the inner wall of the housing 51 above the magnetic collection chamber 43. In order to avoid blocking the flow of powder, both the first baffle 55 and the second baffle 56 are installed on the side wall of the housing 51.

[0034] During the filtration process, the main filter device is positioned above the non-magnetic collection chamber 44, the secondary filter screen 54 is tightly attached to the end wall of the device, and the magnetic block 64 is tightly attached to the main filter screen 61 behind it. Grinding fluid is introduced from the grinding fluid inlet, and the grinding powder is blocked by the main filter screen 61. The non-magnetic powder falls into the non-magnetic collection chamber 44 below under the action of gravity, while the magnetic powder is adsorbed onto the surface of the main filter screen 61 under the action of the magnetic block 64.

[0035] After the operation is completed, the magnetic powder needs to be collected. First, the grinding fluid circulation is turned off, and the electric push rod 42 is started, driving the main filter and the auxiliary filter to move forward synchronously until the main filter 61 touches the second stop 56 and the auxiliary filter 54 touches the first stop 55, reaching the magnetic powder collection position. At this time, the electric push rod 42 is driven to retract. Since the main filter 61 is blocked by the second stop 56 and the auxiliary filter 54 is blocked by the first stop 55, the spring telescopic rod 63 and the spring telescopic rod 62 are stretched, and the magnetic block 64 will gradually separate from the main filter 61. After the magnetic block 64 separates from the main filter 61, the magnetic powder falls into the magnetic powder collection chamber 43 below under the action of gravity. After the magnetic powder falls off, the electric push rod 42 continues to retract, overcoming the elastic force of the coil spring 62. Under the action of the second stop 56, the main filter screen 61 deflects towards the center, and the end of the main filter screen 61 contacts the connecting rod 52. At this time, the grinding fluid continues to flow. The grinding fluid filtered by the secondary filter screen 54 backwashes the main filter screen 61, thus cleaning the main filter screen 61. After cleaning is completed, the main filter device and the secondary filter device are reset under the action of the electric push rod 42. During the reset process of the secondary filter screen 54, the top of the screen tilts downward under the action of the coil spring. During this process, the powder debris blocked on the secondary filter screen 54 will automatically fall into the housing 51.

[0036] Example 2 Tests revealed that if the edge of the grinding wheel is not a circular arc, the discharge at the edge will be more concentrated during the sharpening process, resulting in excessive sharpening of the grinding wheel edge. Therefore, the threaded conductive structure on the surface of the conductive post 32 adopts a variable pitch structure in the axial direction of the conductive post, with the pitch in the middle being smaller than that at both ends, which can effectively overcome the problem of excessive sharpening of the grinding wheel edge.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high speed grinder for bearing rollers comprising a bed (1), characterized in that, The mounting platform (11) is fixedly arranged on the lathe bed (1), and a measuring device (12), a first main shaft (2), a second main shaft (13) and an electromagnetic clamp (14) for fixing a bearing to be ground are arranged on the mounting platform (11); The first main shaft (2) is used for driving a grinding wheel (21), and an on-line dressing module (3) for electrolytic dressing of the grinding wheel is arranged on a shaft box on one side of the grinding wheel (21), and the on-line dressing module (3) comprises a discharge dressing unit, a conductive rotating unit, an electrolyte circulating unit and a reciprocating unit; The grinding fluid circulating system is arranged on the side of the first main shaft (2), and the system comprises a liquid supply tank (4), a liquid return groove (41) and connecting pipelines and a grinding fluid filtering module (5) arranged between the liquid supply tank (4) and the liquid return groove (41); the grinding fluid filtering module (5) comprises a shell (51), a grinding fluid flow channel is arranged in the shell (51), a filtering assembly is slidably arranged in the shell (51), a powder collecting assembly is fixedly arranged below the shell (51), and the grinding fluid filtering module (5) further comprises a driving assembly for driving the filtering assembly to move in the shell (51).

2. A high speed bearing roller grinder as claimed in claim 1 wherein, The discharge dressing unit comprises an electric spark anode (22) which is slidably arranged above the grinding wheel (21) and in contact with a conductive shaft of the grinding wheel, and an electric spark cathode (23) which is fixedly arranged on the shaft box and used for forming a discharge loop during dressing of the grinding wheel.

3. A high speed bearing roller grinder as claimed in claim 2, wherein, The conductive rotating unit comprises an arc-shaped shell (31) arranged close to a working surface of the grinding wheel (21), and a conductive column (32) which is rotatably arranged in the arc-shaped shell (31) and is arranged on the shaft box through a mounting block (24), and a screw thread conductive structure for realizing multi-point tip discharge is arranged on the surface of the conductive column (32), and the screw thread conductive structure is electrically connected with the electric spark cathode (23) through a brush assembly.

4. A high speed bearing roller grinder as claimed in claim 3, wherein, The reciprocating unit comprises a spring assembly arranged on the back of the mounting block (24) and a driving assembly arranged in the center of the conductive column (32), and the spring assembly is connected with the conductive column (32); the reciprocating unit further comprises an insulating guide strip (33) which is arranged below the conductive column (32) and is inclined, the insulating guide strip (33) is provided with a protrusion matched with the screw thread conductive structure on the surface of the conductive column (32), and the bottom of the insulating guide strip (33) is provided with an elastic expansion structure, and the end of the insulating guide strip (33) is provided with a wedge surface matched with the conductive column (32); the driving assembly comprises a driving rod (36) for driving the conductive column (32) to rotate, and the driving rod (36) is slidably arranged in the conductive column (32).

5. A high speed bearing roller grinder as claimed in claim 3, wherein, The electrolyte circulating unit is arranged below the conductive column (32) and comprises an electrolyte nozzle (34) which is upwardly inclined and faces the working surface of the grinding wheel (21), further comprises an adsorption recovery device which is arranged below the conductive column (32) and closely contacts the inner wall of the arc-shaped shell (31), and an electrolyte circulating port is arranged at the bottom of the arc-shaped shell (31).

6. A high speed bearing roller grinder as claimed in claim 1 wherein, The filter assembly comprises a main filter device and a secondary filter device arranged axially along the flow direction; the main filter device comprises a mounting plate (6) and main filter screens (61) symmetrically arranged on both sides of the mounting plate (6) and rotationally connected with the mounting plate (6), a coil spring (62) being arranged between the main filter screens (61) and the mounting plate (6) to make the main filter screens (61) expand towards the inner wall of the shell (51) in a natural state.

7. A high speed bearing roller grinder as claimed in claim 6 wherein, The secondary filter device comprises a secondary filter screen (54) arranged slidingly, the secondary filter screen (54) being connected with the mounting plate (6) through a rod member, and a spring telescopic rod II (53) being arranged between the secondary filter screen (54) and the rod member.

8. A high speed bearing roller grinder as claimed in claim 6, wherein, The mounting plate (6) is provided with a magnetic block (64) on the liquid outlet side of the main filter screen (61), a gap being reserved between the magnetic block (64) and the main filter screen (61); the magnetic block (64) is connected with the mounting plate (6) through a spring telescopic rod I (63), the female rod of the spring telescopic rod I (63) is fixedly connected with the magnetic block (64), and the end of the spring telescopic rod I (63) is fixedly connected with a driving assembly; the spring coefficient of the spring telescopic rod II (53) is equal to the spring coefficient of the spring telescopic rod I (63), and the spring coefficient of the spring telescopic rod II (53) is smaller than the spring coefficient of the coil spring (62).

9. A high speed bearing roller grinder as defined in claim 1 wherein, The powder collecting assembly comprises non-magnetic collecting bins (44) and magnetic collecting bins (43) distributed along the flow direction; the non-magnetic collecting bins (44) are arranged in front of the electrolyte outlet pipes, and the magnetic collecting bins (43) are arranged behind the electrolyte outlet pipes; funnel-shaped powder anti-overflow partitions are arranged at the bin opening positions of the non-magnetic collecting bins (44) and the magnetic collecting bins (43).

10. A high speed bearing roller grinder as claimed in claim 9, wherein, The shell (51) is internally provided with a limiting structure, the limiting structure comprising a stop block I (55) for limiting the position of the secondary filter screen (54) and a stop block II (56) for limiting the position of the main filter screen (61); the stop block I (55) is arranged on the side surface of the inner wall of the shell (51) behind the grinding fluid inlet pipe; the stop block II (56) is arranged on the side surface of the inner wall of the shell (51) above the magnetic collecting bin (43).

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