CN107598192B - Spindle box system of numerical control machine tool - Google Patents
Spindle box system of numerical control machine tool Download PDFInfo
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- CN107598192B CN107598192B CN201710906810.7A CN201710906810A CN107598192B CN 107598192 B CN107598192 B CN 107598192B CN 201710906810 A CN201710906810 A CN 201710906810A CN 107598192 B CN107598192 B CN 107598192B
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- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 238000005461 lubrication Methods 0.000 claims description 13
- 238000005192 partition Methods 0.000 claims description 10
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- 230000000087 stabilizing effect Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 2
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- 238000003754 machining Methods 0.000 abstract description 19
- 238000001816 cooling Methods 0.000 abstract description 10
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- 230000002265 prevention Effects 0.000 abstract description 6
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Abstract
The invention discloses a numerical control machine tool spindle box system, which comprises a box body and a spindle, wherein the box body is provided with a main shaft; the bearing sealing system, the bearing pre-tightening gap eliminating device and the bearing lubricating system are also included. The bearing sealing system of the numerical control machine tool spindle box system can play a role in dust prevention and pollution prevention protection on bearings, can play a role in cooling and cooling the bearing inner rings and the spindle, can improve the rigidity of the spindle and the bearing inner rings, and can keep the rotation precision of the spindle. The bearing pre-tightening gap eliminating device can automatically eliminate gaps generated by bearing abrasion, so that the rigidity of the first deep groove ball bearing and the second deep groove ball bearing is greatly enhanced, the rigidity of a main shaft system can be greatly improved, and the main shaft rotation precision and the machine tool machining precision are improved.
Description
Technical Field
The invention relates to the technical field of machine tools, in particular to a spindle box of a numerical control machine tool.
Background
The headstock is an important component of a machine tool, and includes a case, a spindle unit, and the like. The spindle unit is generally composed of a spindle, a bearing, a transmission member (gear or pulley), and the like. The main shaft is mainly used for supporting transmission parts such as gears and belt wheels, transmitting motion and torque, driving a workpiece or a cutter to rotate and the like in a machine tool, is used as a numerical control machine tool for high-precision machining, and has high quality requirements on main shaft parts.
In the machining process of the machine tool, the radial stress of the main shaft is large, and the axial stress is relatively small, so the radial bearing for supporting the main shaft is very critical in stress capability. In the prior art, a deep groove ball bearing is often used for supporting a main shaft, and the factors of the reduction of the machining precision caused by the bearing mainly include:
1. gaps exist between the inner ring and the outer ring of the bearing and the steel balls, so that when the main shaft is subjected to radial force, the center of the main shaft can deviate, and the machining precision is reduced.
2. The bearing is worn, so that the bearing clearance is increased, and the machining precision is reduced.
3. The bearing moves at a high speed, the temperature rises, the rigidity of the bearing is reduced, and the machining precision is affected.
The rigidity of the spindle is also an important factor affecting the machining accuracy of the machine tool. During machining, a large amount of heat is generated when metal is cut, the cutting heat is partly taken away by cooling liquid, and the part of the cutting heat is transferred to the main shaft, so that the temperature of the main shaft is increased, the rigidity of the main shaft is reduced, and the machining precision is also affected.
Disclosure of Invention
In view of the above, the present invention aims to provide a headstock system of a numerically controlled machine tool, so as to solve the technical problems of reduced machining precision of the machine tool caused by bearing clearance, bearing wear, bearing and spindle temperature rise, etc.
The invention relates to a numerical control machine tool spindle box system, which comprises a box body and a spindle; the method is characterized in that: the front end of the main shaft is arranged on the bearing seat on the inner side of the box body through two deep groove ball bearings, a first deep groove ball bearing in the two deep groove ball bearings is close to the middle of the box body, and a second deep groove ball bearing is close to the outer side of the box body; the rear end of the main shaft is mounted on the box body through an angular contact bearing;
the bearing sealing system comprises a bearing cover connected to the end face of the bearing seat through a bolt, an annular boss pressed on the first deep groove ball bearing is arranged on the bearing cover, a shaft sleeve part matched with the main shaft is arranged in the middle of the bearing cover, a first sealing ring used for sealing a gap between the shaft sleeve part and the main shaft is arranged in the shaft sleeve part, and a first end cover used for preventing the first sealing ring from falling off is arranged on the end face of the shaft sleeve part; a second sealing ring is arranged on the wall of the shaft hole, matched with the front end of the main shaft, of the box body, the second sealing ring is used for sealing a gap between the front end of the main shaft and the shaft hole on the box body, and a second end cover for fixing the second sealing ring is arranged on the end face of the box body; a third sealing ring is arranged on the box body at a position opposite to the inner ring of the second deep groove ball bearing, and is used for sealing a gap between the box body and the end face of the second deep groove ball bearing; the first sealing ring, the second sealing ring and the third sealing ring are V-shaped sealing rings;
the bearing sealing system further comprises an air pressure sealing system, the air pressure sealing system comprises an air compressor, an air purifier connected with the air compressor, an air dryer connected with the air purifier, a gas pressure stabilizing tank connected with the air dryer, a first pressure regulating valve connected with the gas pressure stabilizing tank, and an air inlet joint connected with the first pressure regulating valve, the air inlet joint comprises an annular pipe, an air inlet nozzle arranged on the annular pipe and communicated with the first pressure regulating valve, and a plurality of air outlet nozzles uniformly arranged on the annular pipe, the air outlet nozzles are arranged on the bearing cover, and the air outlet nozzles are opposite to the end face of the inner ring of the first deep groove ball bearing; the main shaft is provided with a first annular air guide groove and a second annular air guide groove, the first annular air guide groove is close to a gap between the end face of the first deep groove ball bearing and the bearing cover, and the second annular air guide groove is close to a gap between the end face of the second deep groove ball bearing and the box body; the surface of the main shaft is also provided with axial air guide grooves which are communicated with the first annular air guide groove and the second annular air guide groove, and a plurality of axial air guide grooves are uniformly distributed along the circumferential direction of the main shaft;
the numerical control machine tool spindle box system further comprises a bearing pre-tightening gap eliminating device, wherein the bearing pre-tightening gap eliminating device comprises a spacing ring arranged between the first deep groove ball bearing and the second deep groove ball bearing, and two side surfaces of the spacing ring are respectively attached to the outer ring end surfaces of the first deep groove ball bearing and the second deep groove ball bearing; the bearing pre-tightening gap eliminating device further comprises a left permanent magnet ring body and a right permanent magnet ring body which are respectively arranged on the end faces of the inner rings of the first deep groove ball bearing and the second deep groove ball bearing, the opposite faces of the left permanent magnet ring body and the right permanent magnet ring body are homonymous magnetic poles, and the opposite parts of the left permanent magnet ring body and the right permanent magnet ring body are also embedded in the same elastic sealing ring sleeve; the inner rings of the first deep groove ball bearing and the second deep groove ball bearing are pressed against the steel balls under the repulsive force of the left permanent magnet ring body and the right permanent magnet ring body, so that the outer rings of the first deep groove ball bearing, the steel balls and the inner rings are in direct contact, and the outer rings of the second deep groove ball bearing, the steel balls and the inner rings are in direct contact;
the numerical control machine tool spindle box system further comprises a bearing lubrication system, wherein the bearing lubrication system comprises an oil tank, an oil filter, an oil pump, a cooler, a second pressure regulating valve, an oil inlet nozzle and an oil outlet nozzle, an oil inlet of the oil filter is connected with the oil tank, an oil outlet of the oil filter is connected with an oil inlet end of the oil pump, an oil outlet end of the oil pump is connected with an oil inlet of the cooler, an oil outlet of the cooler is connected with the second pressure regulating valve, the oil inlet nozzle is arranged on the top of a bearing seat and used for conveying lubricating oil into the bearing, the oil outlet nozzle is arranged on the bottom of the bearing seat and used for connecting the lubricating oil back to the oil tank; the upper half part and the lower half part of the partition ring are respectively provided with an upper arc-shaped oil groove and a lower arc-shaped oil groove which are mutually separated, the partition ring is also provided with an oil hole penetrating through the partition ring along the radial direction, the upper end and the lower end of the oil hole are respectively positioned in the upper arc-shaped oil groove and the lower arc-shaped oil groove, the bearing seat is provided with an oil inlet channel communicated with the upper arc-shaped oil groove and an oil outlet channel communicated with the lower arc-shaped oil groove, the oil inlet nozzle is arranged on the oil inlet channel, and the oil outlet nozzle is arranged on the oil outlet channel.
Further, the elastic sealing ring sleeve is made of nitrile rubber.
The invention has the beneficial effects that:
1. according to the numerical control machine tool spindle box system, the bearing sealing system can introduce compressed air into the gap between the shaft sleeve part and the spindle and the gap between the front end of the spindle and the shaft hole on the box body, when the machine tool works, the pressure of the compressed air pushes the sealing lips of the first sealing ring and the second sealing ring away from the spindle, and meanwhile, the sealing lip of the third sealing ring pushes the end face of the second deep groove ball bearing, so that the friction resistance of the spindle is reduced, and the service life of the sealing rings can be prolonged. The compressed air can also prevent external pollutants such as dust, cooling water and the like from entering the bearing; when the machine tool is stopped, the sealing lip of the sealing ring is elastically pressed on the main shaft, so that dust, water vapor and the like can be prevented from entering the bearing under static state; therefore, the bearing sealing system can have good protection effect on the friction pair in the bearing, and can prolong the service life of the bearing.
In addition, the compressed air can take away the heat transferred to the spindle during the cutting process from the axial air guide groove on the spindle to the gap between the front end of the spindle and the shaft hole on the box body, so that the spindle can be cooled, the rigidity of the spindle is maintained, and the machining precision of the machine tool is maintained. In addition, in the prior art, lubricating oil is usually led into the bearing for cooling the bearing, and the cooling mode can not prevent heat on the main shaft from being transferred to the bearing inner ring, so that the temperature of the bearing inner ring is greatly influenced by the main shaft, and when the temperature of the bearing inner ring is increased, the rigidity of the bearing inner ring is reduced, which leads to the reduction of the rigidity of a main shaft system, and further reduces the machining precision. The compressed air generated in the bearing sealing system can take away the heat transferred to the spindle by cutting, so that the heat transferred to the inner ring of the spindle box bearing can be reduced, and meanwhile, the heat generated by rotation of the bearing can be partly taken away by the compressed air, so that the bearing sealing system can play a role in dust prevention and pollution prevention protection on the bearing, can play a role in cooling the inner ring of the bearing and the spindle, can improve the rigidity of the spindle and the inner ring of the bearing, and can keep the rotation precision of the spindle.
2. According to the numerical control machine tool spindle box system, the bearing pre-tightening gap eliminating device is arranged, after the first deep groove ball bearing and the second deep groove ball bearing are installed, the inner rings of the first deep groove ball bearing and the second deep groove ball bearing are abutted against the steel balls under the repulsive force action of the left permanent magnet ring body and the right permanent magnet ring body, so that the outer rings of the bearings, the steel balls and the inner rings of the bearings are in gapless contact, gaps generated by bearing abrasion can be automatically eliminated by repulsive force exerted by the permanent magnet ring bodies, the rigidity of the first deep groove ball bearing and the rigidity of the second deep groove ball bearing are greatly improved, the rigidity of the spindle system can be greatly improved, and the spindle rotation precision and the machine tool machining precision are improved.
3. According to the numerical control machine tool spindle box system, the bearing lubrication system is arranged to introduce lubricating oil into the bearing, and the lubricating oil can only flow from the upper half part of the bearing to the lower half part of the bearing through the upper arc-shaped oil groove, the lower arc-shaped oil groove and the oil hole structure on the partition ring and the elastic sealing ring sleeve structure for connecting the left magnetic ring body and the right permanent magnetic ring body, so that the bearing can be well lubricated and cooled, the friction and wear of the bearing can be reduced, the bearing temperature can be reduced, and the bearing can maintain good performance for a long time; and the oil filter in the bearing lubrication system can prevent the lubricating oil from bringing impurities into the bearing, and the cooler can keep the temperature of the lubricating oil stable, so that the lubrication and cooling of the lubricating oil in the bearing can be further improved, the bearing can be kept in a good state, and the machining precision of a machine tool system can be further maintained.
Drawings
Fig. 1 is a schematic structural diagram of a headstock system of a numerical control machine tool according to an embodiment;
FIG. 2 is an enlarged schematic view of the portion P of FIG. 1;
FIG. 3 is a schematic diagram of a pneumatic seal system;
FIG. 4 is a schematic diagram of a bearing lubrication system;
FIG. 5 is a schematic view of the spacer ring.
Detailed Description
The invention is further described below with reference to the drawings and examples.
As shown in the figure, the numerical control machine tool spindle box system of the embodiment comprises a box body 1 and a spindle 2; the front end of the main shaft is mounted on the bearing seat on the inner side of the box body through two deep groove ball bearings, a first deep groove ball bearing 4 of the two deep groove ball bearings is close to the middle of the box body, and a second deep groove ball bearing 5 is close to the outer side of the box body; the rear end of the main shaft is arranged on the box body through an angular contact bearing 6.
The numerical control machine tool spindle box system further comprises a bearing sealing system, wherein the bearing sealing system comprises a bearing cover 7 connected to the end face of a bearing seat through a bolt, an annular boss 8 pressed on a first deep groove ball bearing is arranged on the bearing cover, a shaft sleeve part 9 matched with a spindle is arranged in the middle of the bearing cover, a first sealing ring 10 used for sealing a gap between the shaft sleeve part and the spindle is arranged in the shaft sleeve part, and a first end cover 11 used for preventing the first sealing ring from falling off is arranged on the end face of the shaft sleeve part; a second sealing ring 12 is arranged on the wall of the shaft hole on the box body, which is matched with the front end of the main shaft, the second sealing ring is used for sealing a gap between the front end of the main shaft and the shaft hole on the box body, and a second end cover 13 for fixing the second sealing ring is arranged on the end face of the box body; a third sealing ring 14 is arranged on the box body at a position opposite to the inner ring of the second deep groove ball bearing, and is used for sealing a gap between the box body and the end face of the second deep groove ball bearing; the first sealing ring, the second sealing ring and the third sealing ring are V-shaped sealing rings.
The bearing sealing system further comprises an air pressure sealing system, the air pressure sealing system comprises an air compressor 15, an air purifier 16 connected with the air compressor, an air dryer 17 connected with the air purifier, a gas surge tank 18 connected with the air dryer, a first pressure regulating valve 19 connected with the gas surge tank, and an air inlet connector 20 connected with the first pressure regulating valve, the air inlet connector comprises an annular pipe 201, an air inlet nozzle 202 which is arranged on the annular pipe and communicated with the first pressure regulating valve, and a plurality of air outlet nozzles 203 which are uniformly arranged on the annular pipe, the air outlet nozzles are arranged on a bearing cover, and the air outlet nozzles are opposite to the end face of the inner ring of the first deep groove ball bearing; the main shaft is provided with a first annular air guide groove 21 and a second annular air guide groove 22, wherein the first annular air guide groove is close to a gap between the end face of the first deep groove ball bearing and the bearing cover, and the second annular air guide groove is close to a gap between the end face of the second deep groove ball bearing and the box body; the surface of the main shaft is also provided with an axial air guide groove 23 which is communicated with the first annular air guide groove and the second annular air guide groove, and the axial air guide grooves are uniformly distributed with a plurality of grooves along the circumferential direction of the main shaft. The air inlet connector in the embodiment can uniformly send compressed air to the gap between the end face of the first deep groove ball bearing and the bearing cover, and meanwhile, the second annular air guide groove 22 can uniformly send compressed air to the gap between the end face of the second deep groove ball bearing and the box body, so that stable air pressure seal is formed, and lubricating oil leakage is avoided. Meanwhile, the air purifier in the air pressure sealing system can prevent the compressed air from bringing impurities into the bearing, and the air dryer 17 can prevent the air from bringing moisture into the bearing, so that the bearing can be prevented from being damaged by impurities, moisture and the like. And the gas surge tank can stabilize the air pressure, avoids the fluctuation of sealing performance caused by pressure fluctuation, and can conveniently adjust the air through the first pressure regulating valve, so that the air pressure can lead the first sealing ring, the second sealing ring to be separated from the main shaft and the sealing lip of the third sealing ring to be separated from the end face of the bearing when the machine tool works, thereby ensuring that the air pressure can form reliable sealing and lubricating oil leakage can not occur.
The numerical control machine tool spindle box system further comprises a bearing pre-tightening gap eliminating device, wherein the bearing pre-tightening gap eliminating device comprises a spacing ring 24 arranged between the first deep groove ball bearing and the second deep groove ball bearing, and two side surfaces of the spacing ring are respectively attached to the outer ring end surfaces of the first deep groove ball bearing and the second deep groove ball bearing; the bearing pre-tightening gap eliminating device further comprises a left permanent magnet ring body 25 and a right permanent magnet ring body 26 which are respectively arranged on the inner ring end surfaces of the first deep groove ball bearing and the second deep groove ball bearing, opposite surfaces of the left permanent magnet ring body and the right permanent magnet ring body are homonymous magnetic poles, opposite parts of the left permanent magnet ring body and the right permanent magnet ring body are also embedded in the same elastic sealing ring sleeve 27, and the elastic sealing ring body is in a compression shape after the bearing is installed; the inner rings of the first deep groove ball bearing and the second deep groove ball bearing are pressed against the steel balls under the repulsive force of the left permanent magnet ring body and the right permanent magnet ring body, so that the outer rings of the first deep groove ball bearing, the steel balls and the inner rings are in direct contact, and the outer rings of the second deep groove ball bearing, the steel balls and the inner rings are in direct contact.
The numerical control machine tool spindle box system further comprises a bearing lubrication system, wherein the bearing lubrication system comprises an oil tank 28, an oil filter 29, an oil pump 30, a cooler 31, a second pressure regulating valve 32, an oil inlet nozzle 33 and an oil outlet nozzle 34, an oil inlet of the oil filter is connected with the oil tank, an oil outlet of the oil filter is connected with an oil inlet end of the oil pump, an oil outlet end of the oil pump is connected with an oil inlet of the cooler, an oil outlet of the cooler is connected with the second pressure regulating valve, the oil inlet nozzle is arranged on the top of a bearing seat, the oil inlet nozzle is used for feeding lubricating oil into a bearing, the oil outlet nozzle is arranged on the bottom of the bearing seat, and the oil outlet nozzle is used for connecting the lubricating oil back to the oil tank; the upper half and the lower half of the partition ring are respectively provided with an upper arc-shaped oil groove 35 and a lower arc-shaped oil groove 36 which are mutually separated, the partition ring is also provided with an oil hole 37 which penetrates through the partition ring along the radial direction, the upper end and the lower end of the oil hole are respectively positioned in the upper arc-shaped oil groove and the lower arc-shaped oil groove, the bearing seat is provided with an oil inlet channel 38 communicated with the upper arc-shaped oil groove and an oil outlet channel 39 communicated with the lower arc-shaped oil groove, the oil inlet nozzle is arranged on the oil inlet channel, and the oil outlet nozzle is arranged on the oil outlet channel.
According to the numerical control machine tool spindle box system, the arranged bearing sealing system can introduce compressed air into a gap between the shaft sleeve part and the spindle and a gap between the front end of the spindle and the shaft hole on the box body, when the machine tool works, the pressure of the compressed air pushes the sealing lips of the first sealing ring and the second sealing ring away from the spindle, and meanwhile, the sealing lips of the third sealing ring are pushed to the end face of the second deep groove ball bearing, so that the friction resistance of the spindle is reduced, and the service life of the sealing rings can be prolonged. The compressed air can also prevent external pollutants such as dust, water vapor and the like from entering the bearing; when the machine tool is stopped, the sealing lip of the sealing ring is elastically pressed on the main shaft, so that dust, water vapor and the like can be prevented from entering the bearing under static state; therefore, the bearing sealing system can have good protection effect on the friction pair in the bearing, and can prolong the service life of the bearing.
In addition, the compressed air can take away the heat transferred to the spindle during the cutting process from the axial air guide groove on the spindle to the gap between the front end of the spindle and the shaft hole on the box body, so that the spindle can be cooled, the rigidity of the spindle is maintained, and the machining precision of the machine tool is maintained. In addition, in the prior art, lubricating oil is usually led into the bearing for cooling the bearing, and the cooling mode can not prevent heat on the main shaft from being transferred to the bearing inner ring, so that the temperature of the bearing inner ring is greatly influenced by the main shaft, and when the temperature of the bearing inner ring is increased, the rigidity of the bearing inner ring is reduced, which leads to the reduction of the rigidity of a main shaft system, and further reduces the machining precision. The compressed air generated in the bearing sealing system can take away the heat transferred to the spindle by cutting, so that the heat transferred to the inner ring of the spindle box bearing can be reduced, and meanwhile, the heat generated by rotation of the bearing can be partly taken away by the compressed air, so that the bearing sealing system can play a role in dust prevention and pollution prevention protection on the bearing, can play a role in cooling the inner ring of the bearing and the spindle, can improve the rigidity of the spindle and the inner ring of the bearing, and can keep the rotation precision of the spindle.
According to the numerical control machine tool spindle box system, the bearing pre-tightening gap eliminating device is arranged, after the first deep groove ball bearing and the second deep groove ball bearing are installed, the inner rings of the first deep groove ball bearing and the second deep groove ball bearing are abutted against the steel balls under the repulsive force action of the left permanent magnet ring body and the right permanent magnet ring body, so that the outer rings of the bearings, the steel balls and the inner rings of the bearings are in gapless contact, gaps generated by bearing abrasion can be automatically eliminated by repulsive force exerted by the permanent magnet ring bodies, the rigidity of the first deep groove ball bearing and the rigidity of the second deep groove ball bearing are greatly improved, the rigidity of the spindle system can be greatly improved, and the spindle rotation precision and the machine tool machining precision are improved.
According to the numerical control machine tool spindle box system, the arranged bearing lubrication system introduces lubricating oil into the bearing, and the lubricating oil can only flow from the upper half part of the bearing to the lower half part of the bearing through the upper arc-shaped oil groove, the lower arc-shaped oil groove and the oil hole structure on the spacer ring and the elastic sealing ring sleeve structure for connecting the left magnetic ring body and the right permanent magnetic ring body, so that the bearing can be well lubricated and cooled, the friction and wear of the bearing can be reduced, the bearing temperature can be reduced, and the bearing can maintain good performance for a long time; and the oil filter in the bearing lubrication system can prevent the lubricating oil from bringing impurities into the bearing, and the cooler can keep the temperature of the lubricating oil stable, so that the lubrication and cooling of the lubricating oil in the bearing can be further improved, the bearing can be kept in a good state, and the machining precision of a machine tool system can be further maintained.
In this embodiment, the elastic sealing ring sleeve is made of nitrile rubber. In this embodiment, the first sealing ring, the second sealing ring and the third sealing ring are made of nitrile rubber.
The nitrile rubber for the elastic sealing ring sleeve in the embodiment comprises the following components in percentage by weight:
50-80 parts of nitrile rubber;
6-10 parts of metal fiber;
0.5-1.0 part of stearic acid;
2-3 parts of copper oxide;
0.5-1 part of calcium oxide;
6-10 parts of metal fiber;
5 to 10 percent of dioctyl adipate,
5 to 10 percent of dioctyl sebacate,
3-8 parts of diethyl phthalate
1-3 parts of polyethylene wax
0.5-1.5 parts of promoter
1-3 parts of antiozonant
0-3 parts of anti-aging agent
20-30 parts of carbon black
0.5 to 1.5 portions of antioxidant DDA.
The wear resistance of the nitrile rubber is improved and the rebound performance is improved by adding the metal fiber component into the nitrile rubber in the embodiment. The sealing ring has longer service life and better sealing performance.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (1)
1. A numerical control machine tool spindle box system comprises a box body and a spindle; the method is characterized in that: the front end of the main shaft is arranged on the bearing seat on the inner side of the box body through two deep groove ball bearings, a first deep groove ball bearing in the two deep groove ball bearings is close to the middle of the box body, and a second deep groove ball bearing is close to the outer side of the box body; the rear end of the main shaft is mounted on the box body through an angular contact bearing;
the bearing sealing system comprises a bearing cover connected to the end face of the bearing seat through a bolt, an annular boss pressed on the first deep groove ball bearing is arranged on the bearing cover, a shaft sleeve part matched with the main shaft is arranged in the middle of the bearing cover, a first sealing ring used for sealing a gap between the shaft sleeve part and the main shaft is arranged in the shaft sleeve part, and a first end cover used for preventing the first sealing ring from falling off is arranged on the end face of the shaft sleeve part; a second sealing ring is arranged on the wall of the shaft hole, matched with the front end of the main shaft, of the box body, the second sealing ring is used for sealing a gap between the front end of the main shaft and the shaft hole on the box body, and a second end cover for fixing the second sealing ring is arranged on the end face of the box body; a third sealing ring is arranged on the box body at a position opposite to the inner ring of the second deep groove ball bearing, and is used for sealing a gap between the box body and the end face of the second deep groove ball bearing; the first sealing ring, the second sealing ring and the third sealing ring are V-shaped sealing rings;
the bearing sealing system further comprises an air pressure sealing system, the air pressure sealing system comprises an air compressor, an air purifier connected with the air compressor, an air dryer connected with the air purifier, a gas pressure stabilizing tank connected with the air dryer, a first pressure regulating valve connected with the gas pressure stabilizing tank, and an air inlet joint connected with the first pressure regulating valve, the air inlet joint comprises an annular pipe, an air inlet nozzle arranged on the annular pipe and communicated with the first pressure regulating valve, and a plurality of air outlet nozzles uniformly arranged on the annular pipe, the air outlet nozzles are arranged on the bearing cover, and the air outlet nozzles are opposite to the end face of the inner ring of the first deep groove ball bearing; the main shaft is provided with a first annular air guide groove and a second annular air guide groove, the first annular air guide groove is close to a gap between the end face of the first deep groove ball bearing and the bearing cover, and the second annular air guide groove is close to a gap between the end face of the second deep groove ball bearing and the box body; the surface of the main shaft is also provided with axial air guide grooves which are communicated with the first annular air guide groove and the second annular air guide groove, and a plurality of axial air guide grooves are uniformly distributed along the circumferential direction of the main shaft;
the numerical control machine tool spindle box system further comprises a bearing pre-tightening gap eliminating device, wherein the bearing pre-tightening gap eliminating device comprises a spacing ring arranged between the first deep groove ball bearing and the second deep groove ball bearing, and two side surfaces of the spacing ring are respectively attached to the outer ring end surfaces of the first deep groove ball bearing and the second deep groove ball bearing; the bearing pre-tightening gap eliminating device further comprises a left permanent magnet ring body and a right permanent magnet ring body which are respectively arranged on the end faces of the inner rings of the first deep groove ball bearing and the second deep groove ball bearing, the opposite faces of the left permanent magnet ring body and the right permanent magnet ring body are homonymous magnetic poles, and the opposite parts of the left permanent magnet ring body and the right permanent magnet ring body are also embedded in the same elastic sealing ring sleeve; the inner rings of the first deep groove ball bearing and the second deep groove ball bearing are pressed against the steel balls under the repulsive force of the left permanent magnet ring body and the right permanent magnet ring body, so that the outer rings of the first deep groove ball bearing, the steel balls and the inner rings are in direct contact, and the outer rings of the second deep groove ball bearing, the steel balls and the inner rings are in direct contact;
the numerical control machine tool spindle box system further comprises a bearing lubrication system, wherein the bearing lubrication system comprises an oil tank, an oil filter, an oil pump, a cooler, a second pressure regulating valve, an oil inlet nozzle and an oil outlet nozzle, an oil inlet of the oil filter is connected with the oil tank, an oil outlet of the oil filter is connected with an oil inlet end of the oil pump, an oil outlet end of the oil pump is connected with an oil inlet of the cooler, an oil outlet of the cooler is connected with the second pressure regulating valve, the oil inlet nozzle is arranged on the top of a bearing seat and used for conveying lubricating oil into the bearing, the oil outlet nozzle is arranged on the bottom of the bearing seat and used for connecting the lubricating oil back to the oil tank; the upper half part and the lower half part of the partition ring are respectively provided with an upper arc-shaped oil groove and a lower arc-shaped oil groove which are mutually separated, the partition ring is also provided with an oil hole penetrating through the partition ring in the radial direction, the upper end and the lower end of the oil hole are respectively positioned in the upper arc-shaped oil groove and the lower arc-shaped oil groove, the bearing seat is provided with an oil inlet channel communicated with the upper arc-shaped oil groove and an oil outlet channel communicated with the lower arc-shaped oil groove, the oil inlet nozzle is arranged on the oil inlet channel, and the oil outlet nozzle is arranged on the oil outlet channel;
the elastic sealing ring sleeve is made of nitrile rubber.
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| CN201710906810.7A CN107598192B (en) | 2017-09-29 | 2017-09-29 | Spindle box system of numerical control machine tool |
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| CN109605119B (en) * | 2019-01-23 | 2024-02-09 | 苏州工业职业技术学院 | Lathe headstock main shaft band pulley seal structure |
| CN112620667A (en) * | 2021-01-06 | 2021-04-09 | 江苏合球机械科技有限公司 | Spindle box casting based on resin sand and casting method thereof |
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