Double-grinding-wheel direct-drive type dynamic pressure main shaft and oil supply system thereof

Abstract

The utility model discloses a double-grinding-wheel direct-drive type dynamic pressure main shaft and an oil supply system thereof, and relates to the field of grinding machine equipment. Comprising a dynamic pressure main shaft, a grinding carriage and an oil supply mechanism, the dynamic pressure main shaft is installed on one side of the grinding carriage, the oil supply mechanism is installed on the dynamic pressure main shaft and the grinding carriage, and the dynamic pressure main shaft comprises a main shaft shell, a bearing seat, a main shaft and a dynamic pressure bearing; wherein the main shaft shell is installed on one side of the grinding carriage, a dynamic pressure main shaft right side oil return hole is formed in the main shaft shell, the bearing seat is connected with the main shaft shell, a dynamic pressure main shaft left side oil return hole is formed in the bearing seat, and the main shaft is arranged in the main shaft shell and the bearing seat. The dynamic pressure main shaft can be used on the composite grinding center, two grinding wheels can be arranged on one grinding wheel main shaft, and the service life, stability and the like of the grinding wheel main shaft of the composite grinding center are prolonged. Meanwhile, the oil supply mechanism is arranged on the grinding wheel frame of the grinding wheel spindle, so that the length of an oil supply pipeline of the dynamic pressure spindle can be reduced, and the complexity of an oil supply system is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of grinding machine equipment, and particularly relates to a double-grinding-wheel direct-drive hydrodynamic spindle and its oil supply system. Background Art

[0002] As the parts used in various industries are developing towards high precision, and with the increasingly fierce competition among enterprises, new requirements are put forward for industrial mother machines, namely fast efficiency, high precision, long life, and good stability. For a compound grinding center, the spindle used to configure the grinding wheel is a core component, and its rotational speed, precision, life, and stability are crucial for the compound grinding center.

[0003] The spindles used to configure the grinding wheels are generally divided into rolling bearing spindles and sliding bearing spindles. During the working process of the rolling bearing spindle, due to the rolling elements in the bearing rolling in the raceway, damage will inevitably occur, and after the damage, it will directly affect the precision and stability of the spindle. While in the hydrodynamic spindle of the sliding bearing spindle, the spindle and the bearing do not contact during operation, and are separated by an oil film in the middle, only contacting during startup and shutdown, with less wear, good vibration absorption performance, and good impact resistance performance.

[0004] Only one grinding wheel can be configured on the existing direct-drive hydrodynamic spindle, while usually two grinding wheels are configured on one grinding wheel spindle in a compound grinding center, so it cannot be used in a compound grinding center. At the same time, the existing oil supply system of the hydrodynamic spindle is relatively complex. Generally, the oil flows out from the oil tank outside the machine tool, reaches the hydrodynamic spindle, and then returns to the oil tank from the hydrodynamic spindle, with a relatively long length of the oil supply pipe. Summary of the Utility Model

[0005] Utility Model Objective: The utility model aims to provide a double-grinding-wheel direct-drive hydrodynamic spindle and its oil supply system to solve the above problems existing in the prior art.

[0006] Technical Solution: In the first aspect of the utility model, a double-grinding-wheel direct-drive hydrodynamic spindle is proposed. The hydrodynamic spindle includes a spindle housing, a bearing housing, a spindle, and a hydrodynamic bearing.

[0007] Among them, the spindle housing is installed on one side of the grinding wheel frame. A right oil return hole for the hydrodynamic spindle is opened on the spindle housing. The bearing housing is connected to the spindle housing. A left oil return hole for the hydrodynamic spindle is opened on the bearing housing. The spindle is arranged in the spindle housing and the bearing housing. Hydrodynamic bearings are connected between the spindle and the spindle housing and the bearing housing respectively. Bearing oil grooves are opened on the surface of the hydrodynamic bearing, and bearing oil inlet holes are processed radially on the bearing oil grooves. Hydraulic oil flows in from the bearing oil inlet holes and reaches the bearing oil grooves to contact the surface of the spindle.

[0008] In a further embodiment of the first aspect, the hydrodynamic spindle further includes a torque motor. The torque motor is installed between the spindle and the spindle housing. The stator of the torque motor is installed on the spindle housing, and the rotor of the torque motor is installed on the spindle and is used to drive the spindle to rotate.

[0009] In a further embodiment of the first aspect, the hydrodynamic spindle further includes an encoder; the encoder is installed between the spindle and the spindle housing and is used to detect the rotational speed of the spindle.

[0010] In a further embodiment of the first aspect, the hydrodynamic spindle further includes a sealing end cover and a sealing ring; the sealing end cover is installed between the spindle, the spindle housing and the bearing seat, and the sealing ring is installed between the sealing end cover and the spindle and is used to prevent impurities and waste liquid from entering the interior of the hydrodynamic spindle.

[0011] In the second aspect of the present utility model, a fuel supply system is proposed. The fuel supply system is used to supply oil to the double-grinding-wheel direct-drive hydrodynamic spindle described in any one of the above embodiments. The fuel supply system includes a grinding wheel frame and a fuel supply mechanism. The grinding wheel frame is installed on one side of the hydrodynamic spindle, and the fuel supply mechanism is installed on the grinding wheel frame and the hydrodynamic spindle. The fuel supply mechanism includes a motor bracket, a motor, an internal gear pump, a manifold block, and a hydraulic oil treatment component.

[0012] Among them, the motor bracket is installed on the grinding wheel frame, the motor is installed on the motor bracket, the internal gear pump is connected to the driving end of the motor, the internal gear pump is connected to the grinding wheel frame through a conduit, the manifold block is installed on the hydrodynamic spindle and is communicated with the oil inlet hole on the hydrodynamic spindle, a throttle valve is installed on the manifold block, and the hydraulic oil treatment component is connected between the manifold block and the internal gear pump through a conduit;

[0013] The motor is used to drive the internal gear pump to work. The internal gear pump is used to pump out the hydraulic oil in the grinding wheel frame. The pumped-out hydraulic oil is processed by the hydraulic oil treatment component and then enters the manifold block for flow distribution and then enters the hydrodynamic spindle.

[0014] In a further embodiment of the second aspect, the hydraulic oil treatment component includes a fixed block and a filter; the fixed block is installed on the grinding wheel frame, the fixed block is connected to the internal gear pump through a conduit, the filter is installed on the fixed block, and the filter is used to filter the hydraulic oil pumped out by the internal gear pump to improve the cleanliness of the hydraulic oil entering the hydrodynamic spindle.

[0015] In a further embodiment of the second aspect, the hydraulic oil treatment assembly further includes a cooler; the cooler is installed on the grinding wheel headstock, and the cooler is connected to the fixed block through a conduit. The cooler is used to cool the hydraulic oil filtered by the filter to reduce the temperature of the hydraulic oil entering the hydrodynamic spindle.

[0016] In a further embodiment of the second aspect, the oil supply mechanism further includes a liquid level switch and a liquid level gauge; the liquid level switch includes a high liquid level switch and a low liquid level switch installed at a predetermined position on the grinding wheel headstock. The high liquid level switch and the low liquid level switch are used to detect the high and low liquid levels of the hydraulic oil in the grinding wheel headstock respectively. The liquid level gauge is installed on one side of the grinding wheel headstock, and the liquid level gauge is used to observe the liquid level of the hydraulic oil inside the grinding wheel headstock.

[0017] In a further embodiment of the second aspect, a left oil return hole of the grinding wheel headstock is provided at a predetermined position on the grinding wheel headstock. The left oil return hole of the grinding wheel headstock is communicated with the right oil return hole of the hydrodynamic spindle. A right oil return hole of the grinding wheel headstock is provided at a predetermined position on the grinding wheel headstock. The right oil return hole of the grinding wheel headstock is communicated with the left oil return hole of the hydrodynamic spindle. An oil outlet hole of the grinding wheel headstock is provided at a predetermined position on the grinding wheel headstock. The oil outlet hole of the grinding wheel headstock is connected to the internal gear pump through a conduit for discharging the hydraulic oil of the grinding wheel headstock.

[0018] Based on the dual-grinding-wheel direct-drive hydrodynamic spindle disclosed in the first aspect and the oil supply system disclosed in the second aspect, a third aspect of the present invention discloses an oil supply method for a dual-grinding-wheel direct-drive hydrodynamic spindle, and the oil supply method is as follows:

[0019] The hydraulic oil is pumped out by the internal gear pump and first reaches the oil inlet hole of the fixed block. After being filtered by the filter, it reaches the oil outlet hole of the fixed block.

[0020] Next, the hydraulic oil reaches the oil distribution block after being cooled by the cooler. After being split and flowing into the hydrodynamic bearing, it flows to the right oil return hole and the left oil return hole of the hydrodynamic spindle below the hydrodynamic spindle.

[0021] Finally, it returns to the inside of the grinding wheel headstock from the right oil return hole and the left oil return hole of the hydrodynamic spindle through the corresponding left oil return hole and right oil return hole of the grinding wheel headstock respectively.

[0022] Beneficial effects: The present invention discloses a dual-grinding-wheel direct-drive hydrodynamic spindle and its oil supply system. By setting the hydrodynamic spindle, it can be used on a composite grinding center. Two grinding wheels can be configured on one grinding wheel spindle, which increases the service life and stability of the grinding wheel spindle of the composite grinding center, etc. At the same time, by installing the oil supply mechanism on the grinding wheel headstock of the grinding wheel spindle, the length of the oil supply pipeline of the hydrodynamic spindle can be reduced, and the complexity of the oil supply system can be reduced, etc. Description of the Drawings

[0023] Figure 1 This is a schematic cross-sectional structure diagram of the hydrodynamic spindle of the present utility model.

[0024] Figure 2 This is a schematic diagram of the oil groove and oil inlet of the hydrodynamic bearing of the present utility model.

[0025] Figure 3 This is a schematic diagram of the hole positions of the grinding wheel headstock of the present utility model.

[0026] Figure 4 This is a schematic diagram of the oil supply mechanism of the present utility model.

[0027] The reference numerals in the figure are as follows: 1, spindle; 2, spindle housing; 201, right oil return hole of the hydrodynamic spindle; 3, bearing housing; 301, left oil return hole of the hydrodynamic spindle; 4, hydrodynamic bearing; 401, bearing oil inlet hole; 402, bearing oil groove; 5, torque motor; 6, encoder; 7, sealing ring; 8, grinding wheel headstock; 801, left oil return hole of the grinding wheel headstock; 802, right oil return hole of the grinding wheel headstock; 803, oil outlet hole of the grinding wheel headstock; 804, motor mounting hole; 805, fixing block mounting hole; 806, cooler mounting hole; 807, high liquid level switch mounting hole; 808, low liquid level switch mounting hole; 809, liquid level gauge mounting hole; 810, hydrodynamic spindle mounting hole; 811, grinding wheel cover mounting hole; 9, motor; 10, motor bracket; 11, internal gear pump; 12, fixing block; 13, filter; 14, cooler; 15, high liquid level switch; 16, low liquid level switch; 17, oil distribution block; 18, throttle valve; 19, liquid level gauge. Specific embodiments

[0028] In the following description, numerous specific details are given to provide a more thorough understanding of the present utility model. However, it is obvious to those skilled in the art that the present utility model can be implemented without one or more of these details. In other instances, in order to avoid confusion with the present utility model, some well-known technical features are not described.

[0029] The applicant believes that only one grinding wheel can be configured on the existing direct-drive hydrodynamic spindle, while in a compound grinding center, usually two grinding wheels are required to be configured on one grinding wheel spindle, resulting in the inability of the existing direct-drive hydrodynamic spindle to be used in a compound grinding center, which has certain deficiencies.

[0030] For this reason, the applicant proposes a double-grinding-wheel direct-drive hydrodynamic spindle, as Figure 1 - Figure 2 shown, which includes a spindle housing 2, a bearing housing 3, a spindle 1, a hydrodynamic bearing 4, a torque motor 5, an encoder 6, a sealing end cover, and a sealing ring 7.

[0031] Specifically, the main shaft housing 2 is installed on one side of the grinding wheel headstock 8. A hydrodynamic main shaft right oil return hole 201 is provided on the main shaft housing 2. The bearing housing 3 is connected to the main shaft housing 2. A hydrodynamic main shaft left oil return hole 301 is provided on the bearing housing 3. The main shaft 1 is arranged inside the main shaft housing 2 and the bearing housing 3. Hydrodynamic bearings 4 are connected between the main shaft 1 and the main shaft housing 2 and the bearing housing 3 respectively. A torque motor 5 is installed between the main shaft 1 and the main shaft housing 2. An encoder 6 is installed between the main shaft 1 and the main shaft housing 2 for detecting the rotation speed of the main shaft 1. A sealing end cover is installed between the main shaft 1 and the main shaft housing 2 and the bearing housing 3. A sealing ring 7 is installed between the sealing end cover and the main shaft 1 to prevent impurities and waste liquid from entering the inside of the hydrodynamic main shaft.

[0032] In this application, the hydrodynamic bearing 4 includes a left hydrodynamic bearing and a right hydrodynamic bearing. The left hydrodynamic bearing is installed between the main shaft 1 and the bearing housing 3, and the right hydrodynamic bearing is installed between the main shaft 1 and the main shaft housing 2. The main shaft 1 is connected to the bearing housing 3 and the main shaft housing 2 respectively through the left hydrodynamic bearing and the right hydrodynamic bearing. One grinding wheel can be installed at each end of the main shaft 1, which can be applied to a compound grinding center, increasing the service life and stability of the grinding wheel spindle of the compound grinding center, etc. The stator of the torque motor 5 is installed on the main shaft housing 2, and the rotor of the torque motor 5 is installed on the main shaft 1, which plays a role in driving the main shaft 1 to rotate. The encoder 6 is installed on the right side of the hydrodynamic main shaft and has the function of detecting the rotation speed of the main shaft 1, and is a key component for forming a closed-loop control. By cooperating with a numerical control system, etc., the rotation speed of the main shaft 1 can be accurately controlled, further improving the precision of the ground workpiece. In this application, there are two sealing rings 7, which are respectively installed at both ends of the hydrodynamic main shaft to prevent grinding fluid and impurities from entering the inside of the hydrodynamic main shaft.

[0033] In addition, bearing oil grooves 402 are provided on the surface of the hydrodynamic bearing 4. Bearing oil inlet holes 401 are machined radially on the bearing oil grooves 402. Hydraulic oil flows in from the bearing oil inlet holes 401 and reaches the bearing oil grooves 402 to contact the surface of the main shaft 1. Preferably, there are four bearing oil grooves 402 on the inner surface of the hydrodynamic bearing 4 in this application, and bearing oil inlet holes 401 are machined radially on each bearing oil groove 402.

[0034] During operation, the hydraulic oil flows in from the bearing oil inlet holes 401 and reaches the bearing oil grooves 402 to contact the surface of the main shaft 1. The main shaft 1 is in contact with the hydrodynamic bearing 4 when it is stationary. When the main shaft 1 rotates, an oil film can be formed between the main shaft 1 and the hydrodynamic bearing 4 by using the wedge effect load-bearing mechanism, separating the main shaft 1 and the hydrodynamic bearing 4. At this time, the main shaft 1 and the hydrodynamic bearing 4 are not in contact. Therefore, the main shaft 1 only contacts the hydrodynamic bearing 4 at the moment of starting and completely stopping during operation, resulting in minor wear, and no wear occurs during the rest of the working cycle. Therefore, it has the advantages of long service life and high precision.

[0035] Meanwhile, the applicant further found through research that the existing hydrodynamic spindle oil supply system is relatively complex. Generally, oil is discharged from an oil tank outside the machine tool, reaches the hydrodynamic spindle, and then returns to the oil tank from the hydrodynamic spindle, resulting in problems such as a relatively long length of the oil supply pipe.

[0036] Therefore, the applicant proposes an oil supply system for supplying oil to the double-grinding-wheel direct-drive hydrodynamic spindle in the above embodiment, which includes a grinding wheel carriage 8 and an oil supply mechanism. The grinding wheel carriage 8 is installed on one side of the hydrodynamic spindle, and the oil supply mechanism is installed on the grinding wheel carriage 8 and the hydrodynamic spindle, as Figure 4 shown. The oil supply mechanism includes a motor support 10, a motor 9, an internal gear pump 11, a hydraulic oil treatment component, a manifold block 17, a throttle valve 18, a liquid level switch, and a liquid level gauge 19.

[0037] Among them, the motor support 10 is installed on the grinding wheel carriage 8, the motor 9 is installed on the motor support 10, the internal gear pump 11 is connected to the driving end of the motor 9, the internal gear pump 11 is connected to the grinding wheel carriage 8 through a conduit, the manifold block 17 is installed on the hydrodynamic spindle and is connected to the oil inlet hole on the hydrodynamic spindle, the throttle valve 18 is installed on the manifold block 17, the liquid level switch includes a high liquid level switch 15 and a low liquid level switch 16 installed at a predetermined position on the grinding wheel carriage 8, the liquid level gauge 19 is installed on one side of the grinding wheel carriage 8, and the hydraulic oil treatment component includes a fixing block 12, a filter 13, and a cooler 14. Among them, the fixing block 12 is installed on the grinding wheel carriage 8, the fixing block 12 is connected to the internal gear pump 11 through a conduit, the filter 13 is installed on the fixing block 12, the cooler 14 is installed on the grinding wheel carriage 8, the cooler 14 is connected to the fixing block 12 through a conduit, and the manifold block 17 is connected to the cooler 14 through a conduit.

[0038] In the present application, the motor bracket 10 is mounted on the grinding wheel frame 8, the motor 9 is mounted on the motor bracket 10, and plays the role of driving the internal gear pump 11. The internal gear pump 11 is mounted on the motor 9, and the hydraulic oil inside the grinding wheel frame 8 can be pumped out after being driven by the motor 9. The fixed block 12 is mounted on the grinding wheel frame 8, and the filter 13 is mounted on the fixed block 12 to filter the hydraulic oil pumped out by the internal gear pump 11 to ensure the cleanliness of the hydraulic oil entering the dynamic pressure spindle. The cooler 14 is mounted on the grinding wheel frame 8 to cool the hydraulic oil filtered by the filter 13 to reduce the temperature of the hydraulic oil entering the dynamic pressure spindle, thereby reducing the temperature of the entire dynamic pressure spindle. The internal temperature of the dynamic pressure spindle, there are two liquid level switches, one is a high liquid level switch 15, the other is a low liquid level switch 16, which are respectively installed on the grinding wheel frame 8 to detect the high and low liquid levels of the hydraulic oil inside the grinding wheel frame 8. The oil separator 17 is installed on the dynamic pressure spindle and is connected to the oil inlet hole of the spindle 1. The hydraulic oil cooled by the cooler 14 enters the oil separator 17, and the oil is divided into two paths in the oil separator 17, which respectively enter the bearing oil inlet hole 401 of the left dynamic pressure bearing and the bearing oil inlet hole 401 of the right dynamic pressure bearing. The liquid level meter 19 is installed on the side of the grinding wheel frame 8 to observe the current liquid level of the hydraulic oil inside the grinding wheel frame 8.

[0039] like Figure 3 - Figure 4 As shown, a left side oil return hole 801 of the grinding wheel frame is opened at a predetermined position on the grinding wheel frame 8, and the left side oil return hole 801 of the grinding wheel frame is connected with the right side oil return hole 201 of the dynamic pressure spindle. A right side oil return hole 802 of the grinding wheel frame is opened at a predetermined position on the grinding wheel frame 8, and the right side oil return hole 802 of the grinding wheel frame is connected with the left side oil return hole 301 of the dynamic pressure spindle. A grinding wheel frame oil outlet hole 803 is opened at a predetermined position on the grinding wheel frame 8, and the grinding wheel frame oil outlet hole 803 is connected to the internal gear pump 11 through a conduit for exporting the hydraulic oil of the grinding wheel frame 8.

[0040] In the present application, the right oil return hole 201 and the left oil return hole 301 of the dynamic pressure spindle below the dynamic pressure spindle are respectively connected to the left oil return hole 801 and the right oil return hole 802 of the grinding wheel frame 8 on the grinding wheel frame.

[0041] In addition, motor mounting holes 804, fixed block mounting holes 805, cooler mounting holes 806, high liquid level switch mounting holes 807, low liquid level switch mounting holes 808, liquid level gauge mounting holes 809, dynamic pressure spindle mounting holes 810 and grinding wheel cover mounting holes 811 are provided at corresponding positions on the grinding wheel frame 8, wherein the motor mounting holes 804, fixed block mounting holes 805, cooler mounting holes 806, high liquid level switch mounting holes 807, low liquid level switch mounting holes 808 and liquid level gauge mounting holes 809 are used for installing the motor 9, fixed block 12, cooler 14, high liquid level switch 15, low liquid level switch 16 and liquid level gauge 19 respectively, and the dynamic pressure spindle mounting holes 810 and grinding wheel cover mounting holes 811 are used for installing the dynamic pressure spindle and the grinding wheel cover respectively.

[0042] During operation, the flow direction of the hydraulic oil in the hydrodynamic spindle oil supply system is as follows: The hydraulic oil is pumped out by the internal gear pump 11, reaches the oil inlet hole of the fixed block 12, passes through the filter 13 and then reaches the oil outlet hole of the fixed block 12. After being cooled by the cooler 14, it reaches the oil distribution block 17. After being distributed and entering the hydrodynamic bearing, it flows to the right oil return hole 201 of the hydrodynamic spindle and the left oil return hole 301 of the hydrodynamic spindle below the hydrodynamic spindle, and then returns to the inside of the grinding wheel frame 8 via the corresponding left oil return hole 801 of the grinding wheel frame and the right oil return hole 802 of the grinding wheel frame respectively from the right oil return hole 201 of the hydrodynamic spindle and the left oil return hole 301 of the hydrodynamic spindle.

[0043] The hydrodynamic spindle of the present application can be configured with two grinding wheels, so it can be applied to a compound grinding center, improving the service life and stability of the grinding wheel spindle of the compound grinding center. At the same time, setting the oil supply mechanism on the grinding wheel frame 8 can reduce the length of the oil supply pipeline of the hydrodynamic spindle, reduce the complexity of the oil supply system, and also reduce the assembly difficulty and procurement cost.

[0044] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as a limitation of the present invention itself. Various changes in form and detail may be made without departing from the spirit and scope of the present invention defined by the appended claims.

Claims

1. A dual-grinding-wheel direct-drive hydrodynamic spindle, characterized in that, Comprising: A main shaft housing, on which a hydrodynamic main shaft right oil return hole is provided; A bearing housing, connected to the main shaft housing, and a hydrodynamic main shaft left oil return hole is provided on the bearing housing; A main shaft, disposed within the main shaft housing and the bearing housing, and hydrodynamic bearings are connected between the main shaft and the main shaft housing and the bearing housing respectively; Bearing oil grooves are provided on the surface of the hydrodynamic bearing, and bearing oil inlet holes are machined radially on the bearing oil grooves. Hydraulic oil flows in from the bearing oil inlet holes and reaches the contact between the bearing oil grooves and the surface of the main shaft.

2. The hydrodynamic spindle with double grinding wheels and direct drive according to claim 1, characterized in that: The hydrodynamic main shaft further includes a torque motor; The torque motor is installed between the main shaft and the main shaft housing; The stator of the torque motor is installed on the main shaft housing, and the rotor of the torque motor is installed on the main shaft, for driving the main shaft to rotate.

3. A double-grinding-wheel direct-drive hydrodynamic spindle according to claim 1, characterized in that: The hydrodynamic main shaft further includes an encoder; The encoder is installed between the main shaft and the main shaft housing, for detecting the rotational speed of the main shaft.

4. A dual-grinding-wheel direct-drive hydrodynamic spindle according to claim 1, wherein: The hydrodynamic main shaft further includes a sealing end cover and a sealing ring; The sealing end cover is installed between the main shaft, the main shaft housing and the bearing housing, and the sealing ring is installed between the sealing end cover and the main shaft, for blocking impurities and waste liquid from entering the interior of the hydrodynamic main shaft.

5. An oil supply system for supplying oil to the double-grinding-wheel direct-drive hydrodynamic spindle according to any one of claims 1 to 4, characterized in that: Comprising a grinding wheel headstock and an oil supply mechanism, the grinding wheel headstock is installed on one side of the hydrodynamic main shaft, the oil supply mechanism is installed on the grinding wheel headstock and the hydrodynamic main shaft, and the oil supply mechanism includes: A motor bracket, installed on the grinding wheel headstock; A motor, installed on the motor bracket; An internal gear pump, connected to the driving end of the motor, and the internal gear pump is connected to the grinding wheel headstock through a conduit; A manifold block, installed on the hydrodynamic main shaft and communicating with the oil inlet hole on the hydrodynamic main shaft, and a throttle valve is installed on the manifold block; A hydraulic oil treatment assembly, connected between the manifold block and the internal gear pump through a conduit; The motor is used to drive the internal gear pump to work. The internal gear pump is used to pump out the hydraulic oil in the grinding wheel headstock. The pumped-out hydraulic oil is processed by the hydraulic oil treatment assembly and then enters the manifold block for splitting and then enters the hydrodynamic main shaft.

6. The fuel supply system according to claim 5, wherein: The hydraulic oil treatment assembly includes a fixing block and a filter; The fixing block is installed on the grinding wheel headstock, the fixing block is connected to the internal gear pump through a conduit, and the filter is installed on the fixing block; The filter is used to filter the hydraulic oil pumped out by the internal gear pump, improving the cleanliness of the hydraulic oil entering the hydrodynamic main shaft.

7. The oil supply system according to claim 6, characterized in that: The hydraulic oil treatment assembly further includes a cooler; The cooler is installed on the grinding wheel headstock, and the cooler is connected to the fixing block through a conduit; The cooler is used to cool the hydraulic oil filtered by the filter, reducing the temperature of the hydraulic oil entering the hydrodynamic main shaft.

8. The fuel supply system according to claim 5, characterized in that: The oil supply mechanism further includes a liquid level switch and a liquid level gauge; The liquid level switch includes a high liquid level switch and a low liquid level switch installed at a predetermined position on the grinding wheel headstock; The high liquid level switch and the low liquid level switch are used to detect the high and low liquid levels of the hydraulic oil in the grinding wheel headstock respectively; The liquid level gauge is installed on one side of the grinding wheel headstock; The liquid level gauge is used to observe the liquid level of the hydraulic oil inside the grinding wheel frame.

9. The fuel supply system according to claim 5, wherein: The grinding wheel frame is provided with a left oil return hole, a right oil return hole and an oil outlet hole at predetermined positions on the grinding wheel frame. The left oil return hole of the grinding wheel frame is connected to the right oil return hole of the dynamic pressure spindle, and the right oil return hole of the grinding wheel frame is connected to the left oil return hole of the dynamic pressure spindle; The oil outlet hole of the grinding wheel frame is connected to the internal gear pump through a conduit, and is used for exporting the hydraulic oil of the grinding wheel frame.

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