High-speed electric spindle of grinding machine

Abstract

The high-speed motorized spindle comprises an outer shell, the inner wall of the outer shell is rotationally connected with a motorized spindle body through a bearing, an oil inlet groove is formed in the inner wall of the outer shell, one end of the oil inlet groove is in sealed connection with an external oil pipe, and an oil guide groove is formed in the side, close to the bearing, of the inner wall of the outer shell. An oil spraying opening is formed in one side of the oil guide groove. According to the device, lubricating oil is injected into the oil inlet groove from an external oil pipe and then guided into the oil guide groove, the lubricating oil is evenly sprayed out of the bearing from four oil spraying openings and evenly sprayed on the bearing, the situation that the lubricating oil is accumulated at the bottom of the periphery of the bearing due to single-point spraying, and consequently a large amount of leakage is caused is avoided, and the flowing-out lubricating oil is collected through the flow guide plate; and finally, the lubricating oil flows out of the drainage pipe, so that the effects that the bearing lubricating oil is sprayed more uniformly, the leakage amount of the lubricating oil is reduced, and meanwhile, the leaked lubricating oil can be collected are achieved.

Description

Technical Field

[0001] This application relates to the field of electric spindles, and more particularly to a high-speed electric spindle for grinding machines. Background Technology

[0002] Currently, grinding of workpieces in industrial production is mainly carried out on grinding machines. Different types of grinding machines need to be selected according to different processing requirements, such as internal grinding machines, external grinding machines, surface grinding machines, and end face grinding machines. As one of the core components of a grinding machine, the stability of the spindle operation has a significant impact on the quality of the processed workpiece. Traditional grinding machines only provide simple lubrication to the bearings supporting the spindle without taking other measures to improve the spindle's load-bearing capacity. This leads to the spindle being prone to unstable operation and seriously affects the quality of the processed workpiece. Based on this situation, how to enhance the stability of the grinding machine spindle and improve the processing quality of the workpiece has become an increasingly urgent problem for relevant technical personnel to solve.

[0003] However, existing electric spindles generate a lot of heat during operation due to prolonged high-speed rotation. Cooling is usually achieved by injecting circulating water into the electric spindle and housing. While this effectively cools the electric spindle, the housing also generates a lot of heat after prolonged operation, causing the internal temperature of the electric spindle to rise even higher. To prevent overheating, lubricating oil is sprayed onto the bearings to reduce friction and lower the temperature. However, single-point lubrication can lead to excessive lubrication at a single location, resulting in significant lubrication leakage. Utility Model Content

[0004] To address the issues of excessive heat generated by the outer casing during prolonged operation, leading to ever-increasing internal electric spindle temperature, and excessive lubricating oil leakage at single points due to point-jet lubrication, this application provides a high-speed electric spindle for grinding machines.

[0005] The high-speed electric spindle of a grinding machine provided in this application adopts the following technical solution: it includes an outer shell, an electric spindle body is rotatably connected to the inner wall of the outer shell via a bearing, an oil inlet groove is provided on the inner wall of the outer shell, one end of the oil inlet groove is sealed to an external oil pipe, an oil guide groove is provided on the inner wall of the outer shell near the bearing, an oil spray nozzle is provided on one side of the oil guide groove, a cooling sleeve is fixed to the outer wall of the outer shell, a flange is fixed to the outer wall of the cooling sleeve, a guide plate is fixed to the bottom of the flange near the electric spindle body, a water storage tank is provided on the inner wall of the outer shell, and a second water inlet pipe and a second water outlet pipe are provided at one end of the outer shell.

[0006] By adopting the above technical solution, lubricating oil is injected into the oil inlet groove through an external oil pipe. An oil guide groove is opened on the inner wall of the outer casing near the bearing. An oil spray nozzle is opened on one side of the oil guide groove. The oil spray nozzle can directly spray the external lubricating oil onto the outside of the bearing. A first water inlet pipe is fixed through the other end of the outer wall of the cooling sleeve. The first water inlet pipe is located near the electric spindle body and can prioritize cooling the electric spindle body side.

[0007] Preferably, the oil guide groove is arranged in a circular shape, and four oil injection ports are provided, which are located on the outer wall of the oil guide groove and are arranged in a circumferentially equidistant manner.

[0008] By adopting the above technical solution, lubricating oil is injected into the oil tank through an external oil pipe and then guided into the oil guide groove. The lubricating oil injected through the external oil pipe is under pressure, which sprays the lubricating oil evenly from four oil spray nozzles onto the bearing. This ensures that the lubricating oil is sprayed evenly onto the bearing, preventing single-point spraying that would cause the lubricating oil to accumulate at the bottom of the bearing and thus leak in large quantities.

[0009] Preferably, the guide plate is inclined and arc-shaped, and a through hole is provided in the middle of the bottom of the guide plate, and a drainage pipe is fixed at the bottom of the through hole.

[0010] By adopting the above technical solution, when the bearing rotates at high speed, some lubricating oil will still be affected by centrifugal force and splash onto the inner wall of the outer casing, and then flow out from the gap between the electric spindle and the outer casing. The lubricating oil that flows out is collected by the guide plate, then guided to the through hole, and finally flows out from the drainage pipe. It is easy to collect, and can be reused after subsequent filtration and processing, saving costs.

[0011] Preferably, multiple water storage tanks are provided, and the multiple water storage tanks are arranged equidistantly in a circle. The multiple water storage tanks are interconnected, and one end of two of the water storage tanks is respectively connected to the second water inlet pipe and the second water outlet pipe.

[0012] By adopting the above technical solution, cooling water is injected from the second inlet pipe, and the water flow fills multiple water storage tanks. The cooling water in the water storage tanks absorbs the heat inside the outer shell, and the water that has absorbed the heat flows out from the second outlet pipe.

[0013] Preferably, the inner wall of the cooling jacket is provided with a water channel, the cross-section of the water channel is semi-circular, and the water channel is spiral.

[0014] By adopting the above technical solution, the spiral water channel can make the cooling jacket and the outer shell fully contact each other as much as possible, and the water inside the water channel passes through the entire outer shell.

[0015] Preferably, a first drain pipe is fixedly inserted through one end of the outer wall of the cooling sleeve, and a first water inlet pipe is fixedly inserted through the other end of the outer wall of the cooling sleeve. The first drain pipe and the first water inlet pipe are respectively connected to the two ends of the water channel through a sealed connection.

[0016] By adopting the above technical solution, cooling water is injected from the first water inlet pipe, passes through the water flow channel, absorbs heat from the outside of the outer casing, and is then discharged from the first drain pipe.

[0017] Preferably, the length of the cooling sleeve is matched with the length of the outer shell, and both ends of the cooling sleeve are fixed with sealing rings.

[0018] By adopting the above technical solution, the cooling sleeve can cover a large area of ​​the outer shell, and the sealing ring can fill the gap between the cooling sleeve and the outer shell to prevent water leakage.

[0019] In summary, this application includes at least the following beneficial technical effects:

[0020] 1. This application injects lubricating oil into an oil tank through an external oil pipe, and then guides it into an oil guide groove. The lubricating oil is evenly sprayed onto the bearing from four oil spray nozzles, ensuring uniform spraying and preventing single-point spraying that would cause lubricating oil to accumulate at the bottom of the bearing periphery, resulting in significant leakage. The outflowing lubricating oil is collected by a guide plate, then channeled to a through hole, and finally flows out from a drainage pipe. This achieves the effect of more uniform lubricating oil spraying, reducing the amount of lubricating oil leakage, and simultaneously collecting any leaked lubricating oil.

[0021] 2. This application achieves the effect of fully cooling the electric spindle housing by injecting cooling water into the second inlet pipe, the cooling water in the water tank absorbing the heat inside the housing, the water that has absorbed the heat then flowing out from the second outlet pipe, and then injecting cooling water into the first inlet pipe again, passing through the water flow channel. The spiral water flow channel ensures that the cooling jacket and the housing are in full contact. The water inside the water flow channel passes through the entire housing, absorbing the heat outside the housing, and then is discharged from the first drain pipe, thereby achieving the effect of fully cooling the electric spindle housing and reducing the impact of excessive housing temperature on the electric spindle. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a high-speed electric spindle for a grinding machine according to an embodiment of this application;

[0023] Figure 2 This is a schematic diagram of the structure of the outer shell in an embodiment of this application;

[0024] Figure 3 This is a schematic diagram of the internal structure of the outer shell in an embodiment of this application;

[0025] Figure 4 This is a schematic diagram of the cooling sleeve structure in an embodiment of this application;

[0026] Reference numerals in the attached drawings: 1. Outer shell; 2. Cooling jacket; 3. Water channel; 4. First drain pipe; 5. First water inlet pipe; 6. Flange; 7. Electric spindle body; 8. Guide plate; 9. Through hole; 10. Drain pipe; 11. Oil inlet groove; 12. Bearing; 13. Oil guide groove; 131. Oil spray nozzle; 14. Second water inlet pipe; 15. Second water outlet pipe; 16. Water storage tank; 17. Sealing ring. Detailed Implementation

[0027] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0028] This application discloses a high-speed electric spindle for a grinding machine, including a housing 1. An electric spindle body 7 is rotatably connected to the inner wall of the housing 1 via a bearing 12. An oil inlet groove 11 is formed on the inner wall of the housing 1, with one end sealed to an external oil pipe. Lubricating oil is injected into the oil inlet groove 11 through the external oil pipe. An oil guide groove 13 is formed on the inner wall of the housing 1 near the bearing 12, and an oil spray nozzle 131 is formed on one side of the oil guide groove 13. The oil spray nozzle 131 can directly spray external lubricating oil onto the outside of the bearing 12. A cooling sleeve 2 is fixed to the outer wall of the outer casing 1. A flange 6 is fixed to the outer wall of the cooling sleeve 2. A guide plate 8 is fixed to the bottom of the flange 6 near the side of the electric spindle 7. A water storage tank 16 is opened on the inner wall of the outer casing 1. A second water inlet pipe 14 and a second water outlet pipe 15 are provided at one end of the outer casing 1. A first drain pipe 4 is fixed through one end of the outer wall of the cooling sleeve 2. A first water inlet pipe 5 is fixed through the other end of the outer wall of the cooling sleeve 2. The first water inlet pipe 5 is located near the side of the electric spindle 7, so that the side of the electric spindle 7 can be cooled first.

[0029] Reference Appendix Figure 3 The oil guide groove 13 is arranged in a circular shape, and four oil spray nozzles 131 are provided. The four oil spray nozzles 131 are located on the outer wall of the oil guide groove 13 and are arranged in a circumferentially equidistant manner. Lubricating oil is injected into the oil tank 11 from the external oil pipe and then introduced into the oil guide groove 13. When the lubricating oil is injected from the external oil pipe, it is under pressure, which sprays the lubricating oil evenly from the four oil spray nozzles 131 onto the bearing 12. This ensures that the lubricating oil can be sprayed evenly on the bearing 12, and there will be no single-point spray that would cause the lubricating oil to accumulate at the bottom of the outer periphery of the bearing 12, resulting in a large amount of leakage.

[0030] Reference Appendix Figure 2The guide plate 8 is inclined and arc-shaped. A through hole 9 is opened in the middle of the bottom of the guide plate 8. A drainage pipe 10 is fixed at the bottom of the through hole 9. When the bearing 12 rotates at high speed, some lubricating oil will still be affected by centrifugal force and splash onto the inner wall of the outer shell 1. Then it will flow out from the gap between the electric spindle body 7 and the outer shell 1. The lubricating oil flowing out is collected by the guide plate 8 and then drained into the through hole 9. Finally, it flows out from the drainage pipe 10. It is easy to collect and can be reused after subsequent filtration and processing, saving costs.

[0031] Reference Appendix Figure 3 The system includes multiple water storage tanks 16, which are arranged equidistantly in a circle and interconnected. Two of the water storage tanks 16 are connected at one end to the second inlet pipe 14 and the second outlet pipe 15, respectively. Cooling water is injected from the second inlet pipe 14, and the water flows to fill the multiple water storage tanks 16. The cooling water in the water storage tanks 16 absorbs the heat inside the outer shell 1, and the water that has absorbed the heat flows out from the second outlet pipe 15.

[0032] Reference Appendix Figure 4 The cooling sleeve 2 has a water channel 3 on its inner wall. The cross-section of the water channel 3 is semi-circular and spiral. The spiral water channel 3 can make the cooling sleeve 2 fully contact the outer shell 1 as much as possible. The water inside the water channel 3 passes through the entire outer shell 1.

[0033] Reference Appendix Figure 1 and 4 One end of the outer wall of the cooling sleeve 2 is fixed with a first drain pipe 4, and the other end of the outer wall of the cooling sleeve 2 is fixed with a first water inlet pipe 5. The first drain pipe 4 and the first water inlet pipe 5 are respectively connected to the two ends of the water channel 3 through a sealed connection. Cooling water is injected from the first water inlet pipe 5, passes through the water channel 3, absorbs the heat from the outside of the outer shell 1, and is then discharged from the first drain pipe 4.

[0034] Reference Appendix Figure 1 and 4 The length of the cooling sleeve 2 is matched with the length of the outer shell 1, and both ends of the cooling sleeve 2 are fixed with sealing rings 17, so that the cooling sleeve 2 can wrap the outer shell 1 over a large area. The sealing rings 17 can fill the gap between the cooling sleeve 2 and the outer shell 1 to prevent water leakage.

[0035] The implementation principle of a high-speed electric spindle for a grinding machine according to an embodiment of this application is as follows: First, the entire assembly is installed and fixed using flange 6. When the electric spindle body 7 rotates, lubricating oil is injected into the oil groove 11 through an external oil pipe, and then guided into the oil guide groove 13. The lubricating oil injected through the external oil pipe is pressurized, causing it to be evenly sprayed onto the bearing 12 from four oil spray nozzles 131. This ensures that the lubricating oil is evenly sprayed onto the bearing 12, preventing single-point spraying that could cause lubricating oil to accumulate at the bottom of the bearing 12's periphery, resulting in significant leakage. When the bearing 12 rotates at high speed, some lubricating oil will still be affected by centrifugal force and splash onto the inner wall of the outer casing 1, then flow out from the gap between the electric spindle body 7 and the outer casing 1. The guide plate 8 collects the outflowing lubricating oil and guides it out through the through hole 9, and finally out through the drain pipe 10. It is easy to collect the oil and can be reused after subsequent filtration, saving costs. At the same time, during operation, cooling water is injected from the second water inlet pipe 14, and the water flow fills multiple water storage tanks 16. The cooling water in the water storage tanks 16 absorbs the heat inside the outer shell 1. After absorbing the heat, the water flows out from the second water outlet pipe 15. Cooling water is injected from the first water inlet pipe 5 and passes through the water flow channel 3. The spiral water flow channel 3 can make the cooling jacket 2 and the outer shell 1 fully contact each other as much as possible. The water inside the water flow channel 3 passes through the entire outer shell 1, absorbs the heat outside the outer shell 1, and is then discharged from the first drain pipe 4.

[0036] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-speed electric spindle for a grinding machine, comprising a housing (1), wherein an electric spindle body (7) is rotatably connected to the inner wall of the housing (1) via a bearing (12), characterized in that: The inner wall of the outer casing (1) is provided with an oil inlet groove (11), one end of which is sealed to an external oil pipe. The inner wall of the outer casing (1) is provided with an oil guide groove (13) near the bearing (12), and an oil spray nozzle (131) is provided on one side of the oil guide groove (13). A cooling sleeve (2) is fixed to the outer wall of the outer casing (1), and a flange (6) is fixed to the outer wall of the cooling sleeve (2). A guide plate (8) is fixed to the bottom of the flange (6) near the electric spindle body (7). A water storage tank (16) is provided on the inner wall of the outer casing (1), and a second water inlet pipe (14) and a second water outlet pipe (15) are provided at one end of the outer casing (1).

2. A high-speed electric spindle for a grinding machine according to claim 1, characterized in that: The oil guide groove (13) is arranged in a circular shape, and there are four oil injection ports (131). The four oil injection ports (131) are located on the outer wall of the oil guide groove (13) and are arranged in a circumferentially equidistant manner.

3. A high-speed electric spindle for a grinding machine according to claim 1, characterized in that: The guide plate (8) is inclined and arc-shaped. A through hole (9) is provided in the middle of the bottom of the guide plate (8), and a drainage pipe (10) is fixed at the bottom of the through hole (9).

4. A high-speed electric spindle for a grinding machine according to claim 1, characterized in that: Multiple water storage tanks (16) are provided, and the multiple water storage tanks (16) are arranged equidistantly in a circle. The multiple water storage tanks (16) are interconnected, and one end of two of the water storage tanks (16) is connected to the second water inlet pipe (14) and the second water outlet pipe (15) respectively.

5. A high-speed electric spindle for a grinding machine according to claim 1, characterized in that: The cooling sleeve (2) has a water channel (3) on its inner wall. The cross-section of the water channel (3) is semi-circular and spiral.

6. A high-speed electric spindle for a grinding machine according to claim 5, characterized in that: One end of the outer wall of the cooling sleeve (2) is fixed with a first drain pipe (4), and the other end of the outer wall of the cooling sleeve (2) is fixed with a first water inlet pipe (5). The first drain pipe (4) and the first water inlet pipe (5) are respectively connected to the two ends of the water channel (3) in a sealed manner.

7. A high-speed electric spindle for a grinding machine according to claim 6, characterized in that: The length of the cooling sleeve (2) is matched with the length of the outer shell (1), and both ends of the cooling sleeve (2) are fixed with sealing rings (17).

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