CN211565119U - High-speed machining electric spindle with adjustable pre-tightening force of bearing group - Google Patents
High-speed machining electric spindle with adjustable pre-tightening force of bearing group Download PDFInfo
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- CN211565119U CN211565119U CN201922158149.3U CN201922158149U CN211565119U CN 211565119 U CN211565119 U CN 211565119U CN 201922158149 U CN201922158149 U CN 201922158149U CN 211565119 U CN211565119 U CN 211565119U
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Abstract
The utility model relates to a high-speed processing electric main shaft with adjustable bearing group pretightening force, an adjustable pretightening device is arranged on a rear bearing group and consists of a pretightening action ring, an elastic compression body, an air source, a proportion pressure regulating device, a collecting device and a control unit, and the elastic compression body acts on the outer ring of the rear bearing group through the pretightening action ring; the air source is generated by a main air source branch of the numerical control machine tool, compressed air is input into the main shaft through an air channel in the rear bearing seat, the air pressure acts on the rear bearing group through the pre-tightening action ring, and the pressure value is automatically adjusted through the proportional pressure adjusting device at the input end; the collecting device collects the rotating speed or temperature parameters of the rear bearing group and feeds collected data back to the control unit, and the control unit controls the proportional pressure regulating device to regulate pressure. The utility model discloses a mode of elastic element and gas pressure mixed pretension has realized the intelligent regulation of bearing pretightning force, and simple structure, easy to maintain, control accuracy are high.
Description
Technical Field
The utility model belongs to the lathe main shaft field, in particular to bearing group pretightning force adjustable high-speed processing electricity main shaft.
Background
The main shaft bearing is an important component of the electric main shaft and determines the performance of the whole main shaft system. In order to improve the rigidity and the rotation precision of the main shaft bearing, the main shaft bearing needs to be pre-tightened, and the traditional pre-tightening mode is constant-pressure pre-tightening, namely the pre-tightening force is a constant value. In actual production and machining, in order to ensure higher machining efficiency and precision, a high-speed machine tool is required to have functions of low-speed heavy cutting and high-speed light cutting at the same time, an electric spindle is required to have the characteristics of high rigidity and high-speed rotation at the same time, and due to the fact that the pre-tightening force of constant-pressure pre-tightening is a constant value, the pre-load cannot be changed and adjusted, and the requirements of the high rigidity and the high-speed rotation of the electric spindle are difficult to meet. Therefore, an adjustable pre-tightening technology is applied to a spindle system in the industry, namely the variable pre-tightening technology is adopted to determine the pre-tightening force required by the machine tool spindle under different working conditions, the pre-tightening force is applied to the spindle bearing system in an adjustable pre-tightening force applying mode, the rigidity of the low-speed spindle can be improved by applying larger pre-tightening force, and the heat effect caused by the spindle rotating at high speed can be reduced by applying smaller pre-tightening force.
At present, an adjustable pre-tightening device of a main shaft bearing is mostly realized by adopting a hydraulic system, and has the characteristics of large operation range and large operation force, but the hydraulic system is often complex in structure and high in maintenance cost, the accurate relation between the rotating speed and the pre-tightening force of a main shaft is difficult to formulate, and the precision is difficult to control.
Disclosure of Invention
An object of the utility model is to overcome prior art not enough, provide a bearing group pretightning force adjustable high-speed processing electricity main shaft that simple structure, easy to maintain, control accuracy are high.
In order to solve the technical problem, the utility model discloses a realize through following technical scheme: a bearing group pre-tightening force adjustable high-speed processing electric main shaft is composed of a sleeve, a stator, a rotor, a front bearing group, a rear bearing seat and a rear bearing gland, wherein the stator is installed on the inner wall of the sleeve, the rotor composed of a rotor mandrel and a rotor core is concentrically arranged in a stator hole and is supported and rotated by the front bearing group and the rear bearing group; the air source is generated by a main air source branch of the numerical control machine tool, compressed air is input into the main shaft through an air channel in the rear bearing seat, the air pressure acts on the rear bearing group through the pre-tightening action ring, and the pressure value is automatically adjusted through the proportional pressure adjusting device at the input end; the collecting device collects the rotating speed or temperature parameters of the rear bearing group and feeds collected data back to the control unit, and the control unit controls the proportional pressure regulating device to regulate pressure.
According to the high-speed machining electric spindle with the adjustable pre-tightening force of the bearing set, the collecting device is arranged at the rear end of the rear bearing set and is tightly pressed on the inner ring of the rear bearing set through the rear bearing pressing nut.
According to the high-speed machining electric spindle with the adjustable pretightening force of the bearing group, the control unit can be a control module of a numerical control system of a machine tool or an independent control system.
According to the high-speed machining electric spindle with the adjustable pre-tightening force of the bearing group, the pre-tightening action ring is internally provided with the annular groove, the annular groove and the rear bearing seat form an annular sealing cavity, and the gas channel is communicated with the annular sealing cavity; the elastic compression bodies are uniformly arranged in the annular sealing cavity.
According to the high-speed machining electric spindle with the adjustable pre-tightening force of the bearing group, the pre-tightening force of the rear bearing group is generated by the gas pressure provided by the gas source and the elasticity of the elastic compression body together or only by the elasticity of the elastic compression body.
Compared with the prior art, the beneficial effects of the utility model reside in that: the utility model discloses a mode of elastic element and gas pressure mixed pretension, but according to main shaft bearing's parameter state automatically regulated with it the pretightning force that matches, realized the intelligent regulation of bearing pretightning force, can satisfy the characteristic requirement of the high rigidity of electricity main shaft and high-speed rotation simultaneously. The utility model discloses an atmospheric pressure is realized, and the air supply need not additionally to increase annexes such as cylinder by the main air supply branch production of digit control machine tool, and overall structure is simple, easy to maintain to easily realize higher control accuracy.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic diagram of the pretightening force adjustment control of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the utility model discloses a high-speed processing electricity main shaft of bearing group pretightning force adjustable comprises sleeve 1, stator 2, rotor 3, preceding bearing group 4, rear bearing group 5, rear bearing seat 6 and rear bearing pressure mother 7. Stator 2 installs on sleeve 1's inner wall, and rotor 3 that comprises rotor dabber and rotor core sets up in stator 2's stator hole with one heart to it is rotatory through preceding bearing group 4 and the 5 supports of back bearing group, and back bearing frame 6 installs in sleeve 1's tail end, and back bearing group 5 sets up in the back bearing frame, compresses tightly fixedly through back bearing gland 7.
Referring to fig. 1 and 2, in order to adjust the pre-tightening force of the rear bearing set 5, an adjustable pre-tightening device is disposed on the rear bearing set 5, and the adjustable pre-tightening device is composed of a pre-tightening action ring 8, an elastic compression body 9, an air source 10, a proportional pressure adjusting device 11, a collecting device 12, and a control unit 13. The pre-tightening action ring 8 is arranged at the front end of the rear bearing group 5 and acts on the outer ring of the rear bearing group 5; the pre-tightening action ring 8 is provided with an annular groove which forms an annular sealing cavity with the rear bearing seat 6, the elastic compression body 9 is uniformly arranged in the annular sealing cavity, and the elastic force of the elastic compression body is used as part of the pre-tightening force and is transmitted to the rear bearing group 5 through the pre-tightening action ring 8. The rear bearing seat 6 is provided with a gas channel 14 communicated with the annular sealing cavity, a gas source 10 generated by a main gas source branch of the numerical control machine tool is introduced into the annular sealing cavity through the gas channel 14, and the other part of the formed gas pressure as a pre-tightening force acts on the rear bearing group 5 through the pre-tightening acting ring 8. The proportional pressure regulating device 11 is installed at the input end of the gas source 10 and used for regulating the pressure value of gas input into the annular sealing cavity by the gas source. The acquisition device 12 is arranged at the rear end of the rear bearing group 5 and is tightly pressed on the inner ring of the rear bearing group 5 through the rear bearing gland 7, and during work, the acquisition device 12 acquires the rotating speed or temperature parameter of the rear bearing group 5 and feeds acquired data back to the control unit 13, and the control unit 13 in the embodiment is integrated in a machine tool numerical control system and is uniformly controlled by the machine tool numerical control system. After receiving the data acquisition signal of the acquisition device 12, the control unit 13 analyzes and calculates the data, and controls the proportional pressure regulating device 11 to output a corresponding pressure value. Thereby realizing the adjustment of the pretightening force.
According to the difference of the rotation speed of the rear bearing set, the pre-tightening force of the rear bearing set 5 can be generated by the gas pressure provided by the gas source 10 and the elastic force of the elastic compression body 9, or can be generated by the elastic force of the elastic compression body 9 only. When the rotating speed of the rear bearing set 5 is lower than a threshold value, a large pre-tightening force is required, the control unit 13 controls the output of the proportional pressure regulating device 11 to regulate the gas pressure generated by the compressed gas, and at the moment, the pre-tightening force of the rear bearing set 5 is generated by the gas pressure provided by the gas source 10 and the elastic force of the elastic compression body 9. When the rotating speed of the rear bearing set 5 is higher than a threshold value, the temperature rise needs to be effectively controlled, the pretightening force does not need to be too large, the control unit 13 can control the gas pressure output by the proportional pressure regulating device 11 to be zero, and at the moment, the pretightening force of the rear bearing set 5 is completely generated by the elasticity of the elastic compression body 9.
Although the present invention has been described in detail, the present invention is not limited thereto, and those skilled in the art can make various modifications according to the principle of the present invention. Therefore, modifications made in accordance with the principles of the present invention should be understood to fall within the scope of the present invention.
Claims (5)
1. A bearing group pretightening force adjustable high-speed processing electric main shaft is composed of a sleeve, a stator, a rotor, a front bearing group, a rear bearing seat and a rear bearing gland nut, wherein the stator is arranged on the inner wall of the sleeve; the air source is generated by a main air source branch of the numerical control machine tool, compressed air is input into the main shaft through an air channel in the rear bearing seat, the air pressure acts on the rear bearing group through the pre-tightening action ring, and the pressure value is automatically adjusted through the proportional pressure adjusting device at the input end; the collecting device collects the rotating speed or temperature parameters of the rear bearing group and feeds collected data back to the control unit, and the control unit controls the proportional pressure regulating device to regulate pressure.
2. The high-speed machining electric spindle with the adjustable bearing set pretightening force according to claim 1, wherein the collecting device is arranged at the rear end of the rear bearing set and is tightly pressed on an inner ring of the rear bearing set through a rear bearing pressing nut.
3. The high-speed machining electric spindle with the adjustable bearing set pretightening force according to claim 2, wherein the control unit can be a control module of a numerical control system of a machine tool or an independent control system.
4. The high-speed machining electric spindle with the adjustable pre-tightening force of the bearing set according to claim 1, 2 or 3, characterized in that an annular groove is formed in the pre-tightening action ring and forms an annular sealing cavity with the rear bearing seat, and the gas channel is communicated with the annular sealing cavity; the elastic compression bodies are uniformly arranged in the annular sealing cavity.
5. The high-speed machining motorized spindle with the adjustable pre-tightening force of the bearing set as claimed in claim 4, wherein the pre-tightening force of the rear bearing set is generated by both the gas pressure provided by the gas source and the elastic force of the elastic compression body, or only the elastic force of the elastic compression body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922158149.3U CN211565119U (en) | 2019-12-05 | 2019-12-05 | High-speed machining electric spindle with adjustable pre-tightening force of bearing group |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922158149.3U CN211565119U (en) | 2019-12-05 | 2019-12-05 | High-speed machining electric spindle with adjustable pre-tightening force of bearing group |
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| Publication Number | Publication Date |
|---|---|
| CN211565119U true CN211565119U (en) | 2020-09-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922158149.3U Active CN211565119U (en) | 2019-12-05 | 2019-12-05 | High-speed machining electric spindle with adjustable pre-tightening force of bearing group |
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| CN (1) | CN211565119U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112792369A (en) * | 2021-02-09 | 2021-05-14 | 广州市昊志机电股份有限公司 | Electric spindle and machine tool |
| CN112917185A (en) * | 2019-12-05 | 2021-06-08 | 北京精雕科技集团有限公司 | High-speed machining electric spindle with adjustable pre-tightening force of bearing group |
-
2019
- 2019-12-05 CN CN201922158149.3U patent/CN211565119U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112917185A (en) * | 2019-12-05 | 2021-06-08 | 北京精雕科技集团有限公司 | High-speed machining electric spindle with adjustable pre-tightening force of bearing group |
| CN112792369A (en) * | 2021-02-09 | 2021-05-14 | 广州市昊志机电股份有限公司 | Electric spindle and machine tool |
| CN112792369B (en) * | 2021-02-09 | 2022-04-29 | 广州市昊志机电股份有限公司 | Electric spindle and machine tool |
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Denomination of utility model: A high-speed machining electric spindle with adjustable preload of bearing group Effective date of registration: 20230801 Granted publication date: 20200925 Pledgee: China CITIC Bank Corporation Limited Beijing Branch Pledgor: BEIJING JINGDIAO TECHNOLOGY GROUP Co.,Ltd.|BEIJING JINGDIAO PRECISION MACHINERY MANUFACTURING Co.,Ltd. Registration number: Y2023110000317 |