CN214186746U - Direct-drive electric main shaft - Google Patents
Direct-drive electric main shaft Download PDFInfo
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- CN214186746U CN214186746U CN202022725891.0U CN202022725891U CN214186746U CN 214186746 U CN214186746 U CN 214186746U CN 202022725891 U CN202022725891 U CN 202022725891U CN 214186746 U CN214186746 U CN 214186746U
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Abstract
The utility model discloses a direct-drive electric main shaft belongs to the grinding machine field. This direct drive formula electric spindle includes: fixed mounting is at the torque motor in the headstock casing to and with torque motor grafting complex main shaft, main shaft and emery wheel fixed connection, torque motor, main shaft and the coaxial cooperation of emery wheel, the utility model discloses a built-in torque motor drive main shaft and emery wheel for main shaft system overall structure is compact, by torque motor direct drive main shaft system, has saved middle transmission part, very big simplification roll grinder main shaft system's structure, has improved main shaft system's transmission efficiency to and reduced the vibration range and the frequency of main shaft and emery wheel, improved the stability and the grinding precision of lathe.
Description
Technical Field
The utility model belongs to the grinding machine field specifically is a direct drive formula electric spindle.
Background
The main shaft of the existing grinding machine drives a belt to transmit through a common motor to realize transmission of the main shaft, and the problems of overlong transmission chain, low transmission efficiency and low grinding precision caused by large belt vibration exist.
Disclosure of Invention
The purpose of the invention is as follows: a direct drive electric spindle is provided to solve the above problems in the prior art.
The technical scheme is as follows: a direct drive electric spindle comprising: the spindle is fixedly connected with the grinding wheel, and the torque motor, the spindle and the grinding wheel are coaxially matched.
In a further embodiment, the torque motor includes a motor stator fixedly connected to the head frame housing, and a motor rotor accommodated in the motor stator, an inner wall of the motor rotor is fixedly connected to the spindle, the motor rotor is rotatably connected to the motor stator, and in an operating state, the motor rotor and the spindle rotate around a center line of the motor rotor.
In a further embodiment, the direct-drive electric main shaft further comprises at least two bearings sleeved at two ends of the main shaft, the outer walls of the bearings are in butt fit with the head frame shell, the bearings are dynamic and static pressure bearings, the main shaft is supported by the bearing, the centrality of the main shaft can be ensured, the problem that the centrality of the main shaft deviates too much due to the influence of the weight of the grinding wheel on one side of the main shaft is avoided, the main shaft system is optimized through the dynamic and static pressure bearings, so that the grinding speed is higher, the efficiency is higher and the grinding is more stable, the dynamic and static pressure bearings are adopted in the front and the rear radial directions of the main shaft, the throttling principle of the static pressure bearings is utilized, the enough static pressure shaft bearing capacity is generated in the pressure oil cavity, therefore, the abrasion phenomenon of starting and stopping the main shaft is overcome, and after the main shaft is started, the dynamic pressure bearing capacity and the static pressure bearing capacity formed by the shallow cavity step effect are superposed, so that the main bearing capacity is greatly improved, and the main shaft is ensured to have high rotation precision and running stability.
In a further embodiment, the direct-drive electric spindle further comprises a taper sleeve in sleeve connection with one end of the spindle, the inner wall of the taper sleeve is fixedly connected with the spindle, the outer wall of the taper sleeve is in a round table-shaped structure, one end, far away from the spindle, of the outer wall of the taper sleeve is smaller than one end, close to the spindle, of the outer wall of the taper sleeve, the outer wall of the taper sleeve is fixedly connected with the grinding wheel, the outer wall, which is in the round table-shaped structure, of the taper sleeve is fixedly connected with the grinding wheel, and the centricity of the grinding wheel can be guaranteed through the taper.
In a further embodiment, the outer side of the spindle is further sleeved with a shaft sleeve, the inner wall of the shaft sleeve is fixedly connected with the spindle, the outer wall of the shaft sleeve is fixedly connected with the motor rotor, the spindle and the shaft sleeve have interchangeability, the installation and adjustment are convenient and reliable, and meanwhile, the spindle and the shaft sleeve have the characteristics of high rotation precision, good stability, strong dynamic rigidity and difficulty in vibration.
In a further embodiment, the two ends of the main shaft are also fixedly provided with dynamic balancing devices, and idle running elimination, anti-collision control, automatic grinding wheel finishing control, grinding process analysis and optimization and the like can be realized through the pre-balancing function, the full-automatic balancing function and the grinding process vibration monitoring of the dynamic balancing devices.
In a further embodiment, the outer wall of the bearing is provided with a cooling groove, the cooling groove contains cooling liquid or cooling oil, the cooling groove of the bearing is communicated with a cooling system, in an operating state, the cooling liquid or the cooling oil circulates and flows between the cooling groove and the cooling system, the cooling system detects the rotating speed of the main shaft and the temperature of the cooling liquid or the cooling oil in real time, when the temperature exceeds a preset value, the cooling system increases the flow rate of the cooling liquid or the cooling oil, when the temperature is lower than the preset value, the cooling system reduces the flow rate of the cooling liquid or the cooling oil, in a normal operating state, the flowing cooling liquid circulates in the cooling groove, the heat in the operating state of the bearing is taken away, the temperature stability of the main shaft system is ensured, the cooling system intelligently controls the oil amount of the cooling groove according to the rotating speed of the main shaft of the machine tool and the temperature change of the cooling liquid or the cooling oil, if the temperature of the bearing is too high, the cooling system controls and increases the flow of the cooling liquid, ensures that the cooling liquid takes away enough heat, and if the temperature of the bearing is too low, the cooling system controls and reduces the flow of the cooling liquid, and the cooling liquid takes away less heat, thereby ensuring the temperature stability of the machine tool spindle system and ensuring the operation stability of the high-speed spindle system.
In a further embodiment, the cooling groove is an annular cooling groove which is circumferentially opened around the center line of the bearing, and the cooling liquid or the cooling oil can be limited within the range of the outer wall of the bearing through the annular cooling groove, so that the cooling liquid or the cooling oil is prevented from leaking.
Has the advantages that: the utility model discloses a direct drive formula electric spindle through built-in torque motor drive main shaft and emery wheel for main shaft system overall structure is compact, by torque motor direct drive main shaft system, has saved middle transmission part, very big simplification roll grinder main shaft system's structure, has improved main shaft system's transmission efficiency, and has reduced the vibration range and the frequency of main shaft and emery wheel, has improved the stability and the grinding precision of lathe.
Drawings
Fig. 1 is an assembly schematic of the present invention.
Fig. 2 is a schematic view of the bearing according to the present invention.
The reference numerals shown in fig. 1 to 2 are: the device comprises a torque motor 1, a spindle 2, a bearing 3, a taper sleeve 4, a grinding wheel 5, a dynamic balance device 6, a shaft sleeve 7, a headstock shell 8, a cooling system 9, a motor stator 11 and a motor rotor 12.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the present invention.
The applicant finds that a main shaft of an existing grinding machine realizes transmission of the main shaft by driving a belt to transmit through a common motor when the applicant grinds the workpiece by using the grinding machine, and has the problems of overlong transmission chain, low transmission efficiency and low grinding precision caused by large belt vibration.
The direct-drive electric spindle comprises a torque motor 1, a spindle 2, a bearing 3, a taper sleeve 4, a dynamic balance device 6, a shaft sleeve 7, a cooling system 9, a motor stator 11 and a motor rotor 12.
The torque motor 1 is fixedly arranged in the headstock shell 8, the main shaft 2 is in plug-in fit with the torque motor 1, and the main shaft 2 is fixedly connected with the grinding wheel 5.
The torque motor 1 comprises a motor stator 11 fixedly connected with the headstock shell 8 and a motor rotor 12 accommodated in the motor stator 11, the inner wall of the motor rotor 12 is fixedly connected with the spindle 2, the motor rotor 12 is rotatably connected with the motor stator 11, and the torque motor 1, the spindle 2 and the grinding wheel 5 are coaxially matched. In the operating state, the motor rotor 12 and the spindle 2 rotate about the centre line of the motor rotor 12.
The working principle is as follows: under the working state, the torque motor 1 drives the main shaft 2 and the grinding wheel 5 to rotate around the central line of the main shaft 2, the built-in torque motor 1 drives the main shaft 2 and the grinding wheel 5, so that the whole structure of the main shaft 2 system is compact, the torque motor 1 directly drives the main shaft 2 system, a middle transmission part is omitted, the structure of the main shaft 2 system of the roll grinder is greatly simplified, the transmission efficiency of the main shaft 2 system is improved, the vibration amplitude and frequency of the main shaft 2 and the grinding wheel 5 are reduced, and the stability and the grinding precision of the machine tool are improved.
In a further embodiment, the direct drive electric spindle 2 further comprises at least two bearings 3 sleeved at two ends of the spindle 2, the outer walls of the bearings 3 are in abutting fit with the head frame housing 8, wherein the bearings 3 are dynamic and static pressure bearings.
The main shaft 2 is supported by the bearing 3, the centrality of the main shaft 2 can be guaranteed, the problem that the centrality of the main shaft 2 is too large due to the fact that one side of the main shaft 2 is influenced by the weight of the grinding wheel 5 is solved, the main shaft 2 system is optimized through the dynamic and static pressure bearings, the grinding speed is high, the grinding efficiency is high, the main shaft 2 system is stable, the dynamic and static pressure bearings are radially adopted in the front and the back of the main shaft 2, the enough static pressure shaft bearing capacity is generated in a pressure oil cavity by utilizing the throttling principle of the static pressure bearings, the abrasion phenomenon that the main shaft 2 starts and stops is overcome, after the main shaft 2 is started, the dynamic pressure bearing capacity and the static pressure bearing capacity formed by the shallow cavity step effect are superposed, the bearing capacity of the main shaft 2 is greatly improved, and the main shaft 2 is guaranteed to have high rotation precision and running stability.
In a further embodiment, the direct-drive electric spindle 2 further comprises a taper sleeve 4 which is in sleeve joint with one end of the spindle 2, the inner wall of the taper sleeve 4 is fixedly connected with the spindle 2, the outer wall of the taper sleeve 4 is in a circular truncated cone-shaped structure, one end, far away from the spindle 2, of the outer wall of the taper sleeve 4 is smaller than one end, close to the spindle 2, of the outer wall of the taper sleeve 4, and the outer wall of the taper sleeve 4 is fixedly connected with the grinding wheel 5.
The taper can be used for ensuring the centrality of the grinding wheel 5 by fixedly connecting the outer wall of the taper sleeve 4 in a circular truncated cone structure with the grinding wheel 5.
In a further embodiment, a shaft sleeve 7 is further sleeved on the outer side of the main shaft 2, the inner wall of the shaft sleeve 7 is fixedly connected with the main shaft 2, and the outer wall of the shaft sleeve 7 is fixedly connected with the motor rotor 12.
Through the main shaft 2 and the shaft sleeve 7 with interchangeability, the installation and adjustment are convenient and reliable, and the device has the characteristics of high rotation precision, good stability, strong dynamic rigidity and difficulty in vibration.
In a further embodiment, a dynamic balancing device 6 is fixedly arranged at both ends of the main shaft 2.
By the pre-balancing function and the full-automatic balancing function of the dynamic balancing device 6 and the vibration monitoring of the grinding process, idle stroke elimination, anti-collision control, automatic finishing control of the grinding wheel 5, grinding process analysis and optimization and the like can be realized.
In a further embodiment, the outer wall of the bearing 3 is provided with a cooling groove, the cooling groove contains cooling liquid or cooling oil, and the cooling groove of the bearing 3 is communicated with the cooling system 9.
In the working state, the cooling liquid or the cooling oil circularly flows between the cooling tank and the cooling system 9, and the cooling system 9 detects the rotating speed of the main shaft 2 and the temperature of the cooling liquid or the cooling oil in real time.
When the temperature exceeds a predetermined value, the cooling system 9 increases the flow rate of the cooling liquid or the cooling oil.
When the temperature is below a predetermined value, the cooling system 9 reduces the flow of the cooling liquid or cooling oil.
Under the normal operating condition, the cooling liquid that flows is circulating in the cooling tank, take away the heat in the 3 running state of bearing, guarantee the temperature stability of main shaft 2 system, cooling system 9 carries out intelligent control to the oil mass of cooling tank according to 2 rotational speeds of lathe main shaft and the temperature variation of coolant liquid or cooling oil, if the bearing 3 high temperature, cooling system 9 control increases the flow of coolant liquid, guarantee that the coolant liquid takes away abundant heat, if the bearing 3 low temperature is low excessively, cooling system 9 control reduces the flow of coolant liquid, less heat is taken away to the coolant liquid, guarantee the temperature stability of lathe main shaft 2 system, guarantee the operational stability of high-speed main shaft 2 system.
In a further embodiment, the cooling groove is an annular cooling groove opening circumferentially around the centre line of the bearing 3.
The cooling liquid or cooling oil can be limited in the range of the outer wall of the bearing 3 through the annular cooling groove, and the cooling liquid or cooling oil is prevented from leaking.
Claims (7)
1. A direct drive electric spindle, comprising: the spindle is fixedly connected with the grinding wheel, and the torque motor, the spindle and the grinding wheel are coaxially matched;
the spindle further comprises at least two bearings sleeved at two ends of the spindle, the outer walls of the bearings are in butt fit with the headstock shell, and the bearings are dynamic and static pressure bearings.
2. A direct drive electric spindle according to claim 1, wherein the torque motor includes a motor stator fixedly connected to the head frame housing, and a motor rotor received in the motor stator, an inner wall of the motor rotor is fixedly connected to the spindle, the motor rotor is rotatably connected to the motor stator, and in an operating state, the motor rotor and the spindle rotate around a center line of the motor rotor.
3. The direct-drive electric spindle according to claim 1 or 2, further comprising a taper sleeve in sleeve fit with one end of the spindle, wherein an inner wall of the taper sleeve is fixedly connected with the spindle, an outer wall of the taper sleeve is in a circular truncated cone-shaped structure, one end of the outer wall of the taper sleeve, which is far away from the spindle, is smaller than one end of the outer wall of the taper sleeve, which is close to the spindle, and the outer wall of the taper sleeve is fixedly connected with the grinding wheel.
4. The direct-drive electric spindle according to claim 3, wherein a shaft sleeve is further sleeved on the outer side of the spindle, the inner wall of the shaft sleeve is fixedly connected with the spindle, and the outer wall of the shaft sleeve is fixedly connected with a motor rotor.
5. A direct drive electric spindle according to claim 1 or 2, wherein dynamic balancing devices are fixedly mounted at two ends of the spindle.
6. The direct-drive electric spindle according to claim 1, wherein the outer wall of the bearing is provided with a cooling groove, the cooling groove contains cooling liquid or cooling oil, and the cooling groove of the bearing is communicated with a cooling system;
in a working state, cooling liquid or cooling oil circularly flows between the cooling tank and the cooling system, and the cooling system detects the rotating speed of the main shaft and the temperature of the cooling liquid or the cooling oil in real time;
when the temperature exceeds a predetermined value, the cooling system increases the flow of the cooling liquid or the cooling oil;
when the temperature is below a predetermined value, the cooling system reduces the flow of the cooling fluid or oil.
7. A direct drive electric spindle according to claim 6, in which the cooling channel is an annular cooling channel opening circumferentially around the centre line of the bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022725891.0U CN214186746U (en) | 2020-11-23 | 2020-11-23 | Direct-drive electric main shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022725891.0U CN214186746U (en) | 2020-11-23 | 2020-11-23 | Direct-drive electric main shaft |
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| Publication Number | Publication Date |
|---|---|
| CN214186746U true CN214186746U (en) | 2021-09-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022725891.0U Active CN214186746U (en) | 2020-11-23 | 2020-11-23 | Direct-drive electric main shaft |
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| CN (1) | CN214186746U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116372806A (en) * | 2023-06-07 | 2023-07-04 | 华辰精密装备（昆山）股份有限公司 | Grinding wheel variable angle adjusting device, adjusting method and electric spindle grinding system |
| WO2024001048A1 (en) * | 2022-06-27 | 2024-01-04 | 科达制造股份有限公司 | Polishing head driving device and polishing machine |
-
2020
- 2020-11-23 CN CN202022725891.0U patent/CN214186746U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024001048A1 (en) * | 2022-06-27 | 2024-01-04 | 科达制造股份有限公司 | Polishing head driving device and polishing machine |
| CN116372806A (en) * | 2023-06-07 | 2023-07-04 | 华辰精密装备（昆山）股份有限公司 | Grinding wheel variable angle adjusting device, adjusting method and electric spindle grinding system |
| CN116372806B (en) * | 2023-06-07 | 2023-08-29 | 华辰精密装备（昆山）股份有限公司 | Grinding wheel variable angle adjusting device, adjusting method and electric spindle grinding system |
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