High-precision machine tool headstock assembly

Abstract

The utility model relates to the technical field of machine tool headstock assemblies, in particular to a high-precision machine tool headstock assembly which comprises a spindle box and a spindle, a shaft hole is formed in the surface of the spindle box, a bearing outer ring is fixed to the inner wall of the shaft hole, a bearing inner ring is fixedly arranged on the surface of the spindle in a sleeved mode, and a liquid inlet and a liquid outlet are formed in the surface of the spindle box. A liquid inlet pipe, an oil storage tank and a liquid return pipe are fixed on the surface of the spindle box; an oil pump is mounted on the surface of the oil storage tank; the high-precision machine tool headstock assembly has the advantages that the heat dissipation efficiency of the bearing outer ring and the bearing inner ring is improved, and the situations that the lubricating performance is reduced and abrasion is aggravated due to the fact that the temperature of lubricating oil between the bearing outer ring body and the bearing inner ring body is high are avoided; and the service lives of the bearing outer ring and the bearing inner ring are prolonged.

Description

Technical Field

[0001] This utility model relates to the technical field of machine tool headstock components, specifically a high-precision machine tool headstock component. Background Technology

[0002] The high-precision machine tool headstock assembly is one of the important components of a machine tool, mainly used to support, center, clamp, and rotate the workpiece to achieve machining. It typically consists of components such as the spindle box, base plate, spindle, chuck, motor, and transmission system.

[0003] In the prior art, the spindle box has a shaft hole, and the spindle is installed in the shaft hole by bearings, which can reduce the friction between the shaft hole and the spindle. A series of gears and transmission devices are set in the spindle box, and the different speeds and directions of rotation of the spindle can be switched through these devices.

[0004] However, in the existing technology, the spindle box, which is an important component of the headstock assembly of high-precision machine tools, lacks an efficient heat dissipation mechanism for the bearings. When the spindle rotates at high speed for a long time, the relative motion between the inner bearing ring sleeved and fixed on the spindle and the inner bearing ring fixed on the shaft hole wall will cause the bearing itself and the lubricating oil to continuously generate high temperatures. When the temperature accumulates and causes the lubricating oil to overheat, the lubricating ability of the lubricating oil will decrease, and a large degree of wear will occur between the inner and outer bearing rings, resulting in a sharp decrease in the service life of the bearing. Utility Model Content

[0005] The purpose of this invention is to provide a high-precision machine tool headstock assembly to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a high-precision machine tool headstock assembly, comprising: a spindle box and a spindle, a shaft hole is formed on the surface of the spindle box, an outer bearing ring is fixed on the inner wall of the shaft hole, an inner bearing ring is fitted and fixed on the surface of the spindle, an inlet and a outlet are formed on the surface of the spindle box, an inlet pipe, an oil reservoir and a return pipe are fixed on the surface of the spindle box, and an oil pump is installed on the surface of the oil reservoir.

[0007] Preferably, the oil pump is connected to one end of the inlet pipe, and the other end of the inlet pipe is connected to the inlet port.

[0008] Preferably, a return port is provided on the surface of the oil storage tank, and the end of the return pipe away from the spindle box is fixed to the surface of the oil storage tank and connected to the return port. The end of the return pipe fixed to the spindle box is connected to the drain port.

[0009] Preferably, a sealing ring mounting seat is installed on the surface of the spindle box by screws, and a sealing ring is fixed on the surface of the sealing ring mounting seat. Both the sealing ring mounting seat and the sealing ring are circular ring structures. There is a gap between the inner ring of the sealing ring mounting seat and the spindle, and the inner ring of the sealing ring is sleeved on the surface of the spindle body.

[0010] Preferably, the surface of the oil tank is provided with several sets of heat dissipation fins, which are arranged in a linear array, and a cooling fan is installed at one end of the heat dissipation fins by screws.

[0011] Preferably, the cooling fan is an axial fan with adjustable airflow.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] The high-precision machine tool headstock assembly proposed in this utility model uses an oil pump to pump lubricating oil stored in an oil reservoir into the shaft hole. After the shaft hole is filled with lubricating oil, the lubricating oil overflows from the drain port and flows back into the oil reservoir. On the one hand, the original lubricating oil in the oil reservoir is at a lower temperature. After entering the shaft hole, it comes into direct contact with the outer and inner rings of the bearing, which can immediately lower the temperature of the outer and inner rings. On the other hand, when the lubricating oil permeates through the gap between the outer and inner rings, it can squeeze out the lubricating oil with a higher temperature between the outer and inner rings and replace it with a lower temperature lubricating oil. Finally, the lubricating oil continuously circulates between the oil reservoir and the shaft hole, carrying the heat in the shaft hole to the oil reservoir. This increases the heat dissipation area and improves the heat dissipation efficiency of the outer and inner rings of the bearing. It prevents the lubrication performance from decreasing and the wear from accelerating due to the high temperature of the outer and inner rings and the lubricating oil between them, thus extending the service life of the outer and inner rings of the bearing. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic cross-sectional view of the present invention.

[0016] Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A in the middle.

[0017] In the diagram: 1. Spindle box; 2. Shaft hole; 3. Spindle; 4. Bearing outer ring; 5. Bearing inner ring; 6. Liquid inlet; 7. Liquid inlet pipe; 8. Oil reservoir; 9. Oil pump; 10. Liquid return pipe; 11. Liquid drain; 12. Sealing ring mounting base; 13. Sealing ring; 14. Heat dissipation fins; 15. Heat dissipation fan; 16. Liquid return port. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clear and complete, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of this utility model, and are merely used to explain the embodiments of this utility model. They are not intended to limit the embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0019] Example 1: Please refer to Figures 1 to 3 This utility model provides a technical solution: a high-precision machine tool headstock assembly, including: a spindle box 1 and a spindle 3. A shaft hole 2 is provided on the surface of the spindle box 1, and a bearing outer ring 4 is fixed on the inner wall of the shaft hole 2. A bearing inner ring 5 is sleeved and fixed on the surface of the spindle 3. An inlet 6 and a outlet 11 are provided on the surface of the spindle box 1. An inlet pipe 7, an oil tank 8, and a return pipe 10 are fixed on the surface of the spindle box 1. An oil pump 9 is installed on the surface of the oil tank 8. The oil pump 9 is connected to one end of the inlet pipe 7, and the other end of the inlet pipe 7 is connected to the inlet 6. An outlet 16 is provided on the surface of the oil tank 8. The end of the return pipe 10 away from the spindle box 1 is fixed on the surface of the oil tank 8 and connected to the outlet 16. The end of the return pipe 10 fixed on the spindle box 1 is connected to the outlet 11.

[0020] In actual use, when the spindle 3 rotates at high speed in the shaft hole 2 opened on the surface of the spindle box 1, the spindle 3 drives the inner ring 5 of the bearing to rotate at high speed, while the outer ring 4 of the bearing is fixed on the inner wall of the shaft hole 2 and remains stationary. Therefore, a high-speed relative motion occurs between the outer ring 4 of the bearing and the inner ring 5 of the bearing. This high-speed relative motion causes the lubricating oil between the outer ring 4 of the bearing and the inner ring 5 of the bearing to generate high temperature. At this time, the oil pump 9 starts and pumps the lubricating oil stored in the oil tank 8 into the shaft hole 2 through the inlet pipe 7 and the inlet port 6. After the shaft hole 2 is filled with lubricating oil, under the action of oil pressure, the lubricating oil overflows from the drain port 11 and flows back to the oil tank 8 through the return pipe 10 and the return port 16. On the one hand, the original lubricating oil in the oil tank 8 is at a low temperature, and after entering the shaft hole 2, it reacts with the outer ring 4 of the bearing and the inner ring 5 of the bearing. The direct contact between the inner ring 5 and the outer ring 4 and inner ring 5 of the bearing allows the temperature to drop immediately. On the other hand, when the lubricating oil penetrates through the gap between the outer ring 4 and inner ring 5, it can squeeze out the lubricating oil with a higher temperature between the outer ring 4 and inner ring 5 and replace it with lubricating oil with a lower temperature. This prevents the lubricating oil between the outer ring 4 and inner ring 5 from having a high temperature, which would lead to a decrease in lubrication performance. Finally, the lubricating oil continuously circulates between the oil reservoir 8 and the shaft hole 2, carrying the heat in the shaft hole 2 to the oil reservoir 8. This increases the heat dissipation area and improves the heat dissipation efficiency of the outer ring 4 and inner ring 5 of the bearing. It also prevents the outer ring 4 and inner ring 5 from becoming insufficiently lubricated and experiencing accelerated wear due to overheating, thus extending the service life of the outer ring 4 and inner ring 5 of the bearing.

[0021] Example 2: Based on Example 1, in order to seal the shaft hole 2, a sealing ring mounting seat 12 is installed on the surface of the spindle box 1 by screws, and a sealing ring 13 is fixed on the surface of the sealing ring mounting seat 12. Both the sealing ring mounting seat 12 and the sealing ring 13 are circular ring structures. There is a gap between the inner ring of the sealing ring mounting seat 12 and the spindle 3, and the inner ring of the sealing ring 13 is sleeved on the shaft surface of the spindle 3.

[0022] A sealing ring mounting seat 12 is installed on the surface of the spindle box 1, and a sealing ring 13 is fixed on the surface of the sealing ring mounting seat 12. The sealing ring mounting seat 12 is made of metal material, which makes the installation more secure. The sealing ring 13 is made of rubber material. There is a gap between the inner ring of the sealing ring mounting seat 12 and the spindle 3 to prevent wear between the inner ring of the sealing ring mounting seat 12 and the spindle 3. The inner ring of the sealing ring 13 is in close contact with the shaft body of the spindle 3, and the outer ring of the sealing ring 13 is in close contact with the hole wall at the opening of the shaft hole 2, thereby sealing the gap between the shaft hole 2 and the spindle 3 and preventing the lubricating oil in the shaft hole 2 from leaking.

[0023] Example 3: Based on Example 2, in order to further improve the heat dissipation efficiency of the outer ring 4 and the inner ring 5 of the bearing, several sets of heat dissipation fins 14 are provided on the surface of the oil tank 8. The several sets of heat dissipation fins 14 are arranged in a linear array. One end of the heat dissipation fins 14 is equipped with a cooling fan 15 by screws. The cooling fan 15 is an axial flow fan and its airflow is adjustable.

[0024] A large number of heat dissipation fins 14 are provided on the surface of the oil reservoir 8 to further increase the heat dissipation area. At the same time, a cooling fan 15 is installed at one end of the heat dissipation fins 14. The cooling fan 15 blows air onto the heat dissipation fins 14, which increases the airflow speed around the heat dissipation fins 14 and improves the speed at which the heat dissipation fins 14 dissipate heat to the surrounding air. This makes the cooling speed of the lubricating oil that circulates back into the oil reservoir 8 faster, and further makes the temperature of the lubricating oil in the oil reservoir 8 lower when it enters the shaft hole 2. This makes the temperature on the surface of the bearing outer ring 4 and the bearing inner ring 5 transferred to the lubricating oil faster, thus improving the cooling efficiency of the bearing outer ring 4 and the bearing inner ring 5.

[0025] In actual use, when the spindle 3 rotates at high speed in the shaft hole 2 opened on the surface of the spindle box 1, the spindle 3 drives the inner ring 5 of the bearing to rotate at high speed, while the outer ring 4 of the bearing is fixed on the inner wall of the shaft hole 2 and remains stationary. Therefore, a high-speed relative motion occurs between the outer ring 4 and the inner ring 5 of the bearing. This high-speed relative motion causes the lubricating oil between the outer ring 4 and the inner ring 5 of the bearing to generate high temperature. At this time, the oil pump 9 starts and pumps the lubricating oil stored in the oil tank 8 into the shaft hole 2 through the inlet pipe 7 and the inlet port 6. After the shaft hole 2 is full of lubricating oil, under the action of oil pressure, the lubricating oil overflows from the drain port 11 and flows back to the oil tank 8 through the return pipe 10 and the return port 16. On the one hand, the original lubricating oil in the oil tank 8... The lubricating oil, being at a lower temperature, enters the shaft hole 2 and directly contacts the outer ring 4 and inner ring 5 of the bearing, immediately reducing their temperature. Furthermore, as the lubricating oil permeates through the gap between the outer and inner rings, it displaces the already hot lubricating oil between them, replacing it with cooler oil. This prevents the lubricating oil between the outer and inner rings from becoming too hot and causing a decrease in lubrication performance. Finally, the lubricating oil continuously circulates between the oil reservoir 8 and the shaft hole 2, carrying heat from the shaft hole 2 to the oil reservoir 8, increasing the heat dissipation area and improving the heat dissipation efficiency of the outer and inner rings, preventing the shaft hole from becoming too hot and causing a decrease in lubrication performance. The outer bearing ring 4 and inner bearing ring 5 suffer from insufficient lubrication and accelerated wear due to overheating, thus extending their service life. A sealing ring mounting seat 12 is installed on the surface of the spindle housing 1, and a sealing ring 13 is fixed to the surface of the sealing ring mounting seat 12. The sealing ring mounting seat 12 is made of metal, making the installation more secure. The sealing ring 13 is made of rubber. A gap is left between the inner ring of the sealing ring mounting seat 12 and the spindle 3 to prevent wear between the inner ring of the sealing ring mounting seat 12 and the spindle 3. The inner ring of the sealing ring 13 is tightly attached to the shaft body of the spindle 3, and the outer ring of the sealing ring 13 is tightly attached to the hole wall at the opening of the shaft hole 2, thereby sealing the gap between the shaft hole 2 and the spindle 3. The lubricating oil in the shaft hole 2 is sealed to prevent leakage. A large number of heat dissipation fins 14 are provided on the surface of the oil reservoir 8 to further increase the heat dissipation area. At the same time, a cooling fan 15 is installed at one end of the heat dissipation fins 14. The cooling fan 15 blows air onto the heat dissipation fins 14, which increases the airflow speed around the heat dissipation fins 14 and increases the speed at which the heat dissipation fins 14 dissipate heat to the surrounding air. This makes the lubricating oil that circulates back into the oil reservoir 8 dissipate heat faster, and further makes the temperature of the lubricating oil in the oil reservoir 8 lower when it enters the shaft hole 2. This makes the temperature on the surface of the bearing outer ring 4 and the bearing inner ring 5 transfer to the lubricating oil faster, thus improving the cooling efficiency of the bearing outer ring 4 and the bearing inner ring 5.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high precision machine tool head assembly comprising: The utility model provides a main shaft box (1) and main shaft (3), the surface of main shaft box (1) is set up with shaft hole (2), the inner wall of shaft hole (2) is fixed with bearing outer ring (4), the surface of main shaft (3) is set up with fixed bearing inner ring (5), it is characterized by: the surface of main shaft box (1) is set up with liquid inlet (6) and liquid outlet (11), the surface of main shaft box (1) is fixed with liquid inlet pipe (7), oil tank (8) and liquid return pipe (10), the surface of oil tank (8) is installed with oil pump (9).

2. A high precision machine tool head assembly according to claim 1, characterised in that: The oil pump (9) is connected with one end of the liquid inlet pipe (7), and the other end of the liquid inlet pipe (7) is connected with the liquid inlet (6).

3. A high precision machine tool head assembly according to claim 1, wherein: The surface of the oil tank (8) is provided with a liquid return port (16), and one end of the liquid return pipe (10) away from the main shaft box (1) is fixed on the surface of the oil tank (8) and connected with the liquid return port (16). One end of the liquid return pipe (10) fixed on the main shaft box (1) is connected with the liquid outlet (11).

4. A high precision machine tool head assembly according to claim 1, wherein: The surface of the main shaft box (1) is provided with a sealing ring mounting seat (12) mounted by screws, and the surface of the sealing ring mounting seat (12) is fixed with a sealing ring (13). The sealing ring mounting seat (12) and the sealing ring (13) are both circular ring structures. There is a gap between the inner ring of the sealing ring mounting seat (12) and the main shaft (3), and the inner ring of the sealing ring (13) is sleeved on the surface of the shaft body of the main shaft (3).

5. A high precision machine tool head assembly according to claim 1, wherein: The surface of the oil tank (8) is provided with a plurality of groups of heat dissipation fins (14), which are linearly arranged. One end of the heat dissipation fin (14) is provided with a heat dissipation fan (15) mounted by screws.

6. A high precision machine tool head assembly according to claim 5, wherein: The heat dissipation fan (15) is an axial flow fan, and the air volume can be adjusted.

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