CN208680558U - Hemispheric gas static-pressure shafting and precision equipment - Google Patents

Abstract

The utility model relates to precision machinery technology field more particularly to a kind of hemispheric gas static-pressure shaftings and precision equipment.The hemispheric gas static-pressure shafting includes main shaft, bearing, motor and outer shaft sleeve；Main shaft is connected with outer shaft sleeve by bearing；Bearing includes bushing and bearing shell；Outer shaft sleeve, bearing shell, bushing and main shaft are successively socketed, and bushing is fixedly connected with main shaft, and bearing shell is fixedly connected with outer shaft sleeve；Bearing shell is made of porous air pervious material；Outer shaft sleeve is provided with the air film air vent being connected to bearing shell, so that gas enters bearing shell through air film air vent and forms pressurized air film between bearing shell and bushing, is suspended in bushing in bearing shell；The inside of outer shaft sleeve is arranged in motor, and the rotor of motor is sleeved on main shaft, and the stator of motor is arranged between rotor and outer shaft sleeve.The precision equipment includes hemispheric gas static-pressure shafting.The purpose of this utility model is to provide hemispheric gas static-pressure shafting and precision equipments, improve the stationarity and precision of main shaft rotation.

Description

Hemispheric gas static-pressure shafting and precision equipment

Technical field

The utility model relates to precision machinery technology fields more particularly to a kind of hemispheric gas static-pressure shafting and precision to set It is standby.

Background technique

With the development of science and technology, the demand of various machine tools is more and more, gets over to machine tool required precision Come higher.The demand of current scientific technological advance is unable to satisfy by traditional manual or automanual operating method, for vehicle, For the machine tools such as milling, mill in the precision machining processes of components, precision, the spindle abrasion degree of main shaft rotation determine zero Part machining accuracy.The main shaft of machine tool equipment is supported mainly by bearing mechanical, and initial precision is not high, with process time Increase, mechanical friction abrasion is quite serious, and the precision of main shaft rotation becomes worse, and the precise processing precision of components much reaches Less than requiring.There is an urgent need to high-accuracy and ultra-precise revolving shaftings for die industry, national defence and military industry.

Therefore, the application provides a kind of new hemispheric gas static-pressure shafting and precision equipment regarding to the issue above, to mention The stationarity and precision of high main shaft rotation, and then guarantee the precision of Precision Machining components.

Utility model content

The purpose of this utility model is to provide hemispheric gas static-pressure shafting and precision equipments, improve the flat of main shaft rotation Stability and precision.

Based on above-mentioned purpose, hemispheric gas static-pressure shafting provided by the utility model, including main shaft, bearing, motor and Outer shaft sleeve；It is connected between the main shaft and the outer shaft sleeve by the bearing；

The bearing includes bushing and bearing shell；The outer shaft sleeve, the bearing shell, the bushing and the main shaft successively cover It connects, and the bushing is fixedly connected with the main shaft, the bearing shell is fixedly connected with the outer shaft sleeve；The bushing is in segment-shaped Or billiard table shape；The bearing shell is in ball shape；

The bearing shell is made of porous air pervious material；The outer shaft sleeve is provided with the air film gas supply being connected to the bearing shell Hole, so that gas enters the bearing shell through the air film air vent and forms pressurized air between the bearing shell and the bushing Film, the bushing and the main shaft can suspend；

The inside of the outer shaft sleeve is arranged in the motor, and the rotor of the motor is sleeved on the main shaft, described The stator of motor is arranged between the rotor of the motor and the outer shaft sleeve.

Optionally, at least provided with a pair of bearing in the axial direction of the main shaft, the main shaft；

The bearing being arranged in pairs is separately positioned on the two sides of the motor.

Optionally, the pairs of bearing is symmetrical arranged about the motor；

The bearing shell and the main shaft interval are arranged.

Optionally, the outer shaft sleeve include outer race section and with the one-to-one bearing shell portions of the bearing；The outer race section It is fixedly connected with the bearing shell portions；

The inside of the outer race section is arranged in the motor；

The bearing shell is fixedly connected with the bearing shell portions, and the bearing shell and the bushing are arranged in the bearing shell portions Inside；

The outer race section and/or the bearing shell portions are provided with the air film air vent；

The bearing shell is provided with the bearing shell air drain being connected to the air film air vent far from the bushing on one side；The axis The quantity of watt air drain is multiple；Multiple bearing shell air drains are arranged along the axially spaced-apart of the main shaft；The bearing shell air drain is in ring Shape.

Optionally, the quantity of the bearing is a pair, respectively first bearing and second bearing；Correspondingly, the bearing shell The quantity of portions is two；

Along the axial direction of the main shaft, the first end of the main shaft is fixedly connected with main shaft disk, the main shaft disk and described the The bushing of one bearing is removable to be fixedly connected；The second end corresponding with first end of the main shaft is fixedly connected with ring flange, institute State ring flange with the bushing of the second bearing is removable is fixedly connected；

The outer race section and the bearing shell portions are connected with coaxial locating ring, and the coaxial locating ring setting is described outer The inside of the inside in set portion and the bearing shell portions.

Optionally, the main shaft is internally provided with main shaft inner cavity, the main shaft inner cavity along the axially extending of the main shaft and Both ends open；

Along the axial direction of the main shaft, the first end of the main shaft is fixedly connected with main shaft disk；The main shaft and first end Corresponding second end is connected with the power air connector being connected to the main shaft inner cavity；The main shaft disk is provided with and the main shaft The main shaft disk chamber of inner cavity connection.

Optionally, the main shaft disk is fixedly connected with vacuum chuck far from the main shaft on one side；The vacuum chuck is remote The bothrium being provided on one side for adsorbing workpiece from the main shaft；The bothrium is connected to the main shaft disk chamber；By described When power air connector is evacuated, the vacuum chuck can adsorb fixed workpiece；

Or,

The intracavitary setting of main shaft disk has the piston for retracting the main shaft disk chamber movement tendency；The piston includes piston Extension and the piston bottom portions being fixedly connected with the piston extension；The piston bottom portions are always positioned at the main shaft disk Intracavitary, the piston extension is used to fix workpiece and can be along the axially extended of the main shaft or the retraction main shaft disk Chamber；When the power air connector supplies, gas enters the main shaft disk chamber by the main shaft inner cavity, the main shaft disk chamber Air pressure can enable some or all of stretching of the piston extension main shaft disk chamber when reaching threshold value.

Optionally, slide bushing is provided between the piston extension and the main shaft disk；

Elastic component is provided between the piston bottom portions and the main shaft disk, the elastic component, which has, enables the piston bottom Portions retract the main shaft disk chamber movement tendency, so that the piston extension has with the piston bottom portions retracts the master Reel chamber movement tendency.

Optionally, the stator quantity of the motor is one or more；

Coolant jacket in a ring is provided between the outer shaft sleeve and the stator of the motor；The coolant jacket and the axis The surface of housing contact is provided with multiple cooling liquid baths having in a ring；Multiple cooling liquid baths are between the axial direction of the main shaft Every setting；

The outer shaft sleeve is provided with the coolant liquid loop head and coolant liquid loop exit being connected to the cooling liquid bath.

Based on above-mentioned purpose, precision equipment provided by the utility model, including the hemispheric gas static-pressure shafting.

Hemispheric gas static-pressure shafting and precision equipment provided by the utility model, are made by using porous air pervious material Bearing shell so that gas through air film air vent enter bearing shell and between bearing shell and bushing formed pressurized air film, with can will Bushing and main shaft suspend, so that main shaft is in and is perhaps substantially at friction-free rotary and avoids or substantially avoided main shaft Abrasion, and then improve main shaft rotation stationarity and precision, ensure that the precision of Precision Machining components；It is in by bushing Segment-shaped or billiard table shape, bearing shell are in ball shape, to improve the bearing capacity of bearing, and then improve hemispheric gas static-pressure shafting Bearing capacity；By the way that motor is arranged in the inside of outer shaft sleeve, and the rotor of motor is sleeved on main shaft, the stator setting of motor Between the rotor and outer shaft sleeve of motor, the stress of main shaft is enabled to compare balance, hence it is evident that reduce the radial force generated by rotor The influence of unbalance loading is caused, to main shaft to further increase the stationarity and precision of the rotation of main shaft.

Detailed description of the invention

It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art Specific embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, it is described below In attached drawing be that some embodiments of the utility model are not paying creativeness for those of ordinary skill in the art Under the premise of labour, it is also possible to obtain other drawings based on these drawings.

Fig. 1 is the first structure diagram of hemispheric gas static-pressure shafting provided by the embodiment of the utility model；

Fig. 2 is the second structural schematic diagram of hemispheric gas static-pressure shafting provided by the embodiment of the utility model；

Fig. 3 is the third structural schematic diagram of hemispheric gas static-pressure shafting provided by the embodiment of the utility model；

Fig. 4 is the right half part schematic diagram of hemispheric gas static-pressure shafting shown in Fig. 3；

Fig. 5 is the enlarged diagram of the piston structure part of hemispheric gas static-pressure shafting shown in Fig. 4.

Icon: 100- main shaft；110- main shaft inner cavity；200- bearing；210- bushing；220- bearing shell；221- bearing shell air drain； 300- motor；310- rotor；320- stator；400- outer shaft sleeve；410- outer race section；420- bearing shell portions；The coaxial locating ring of 430-； 440- coolant jacket；441- cools down liquid bath；500- main shaft disk；510- main shaft disk chamber；600- ring flange；700- power air connector； 800- vacuum chuck；810- bothrium；900- piston；910- piston extension；920- piston bottom portions；930- slide bushing； 940- elastic component.

Specific embodiment

The technical solution of the utility model is clearly and completely described below in conjunction with attached drawing, it is clear that described Embodiment is the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, originally Field those of ordinary skill every other embodiment obtained without making creative work belongs to practical Novel protected range.

It is in the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", " perpendicular Directly ", the orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, and is only For ease of description the utility model and simplify description, rather than the device or element of indication or suggestion meaning must have it is specific Orientation, be constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.In addition, term " the One ", " second ", " third " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.

In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary, It can be the connection inside two elements.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition The concrete meaning of language in the present invention.

Embodiment

Referring to shown in Fig. 1-Fig. 5, present embodiments providing a kind of hemispheric gas static-pressure shafting；Fig. 1-Fig. 3 is this implementation The first structure diagram for the hemispheric gas static-pressure shafting that example provides is to third structural schematic diagram；In order to more clearly show that Structure, Fig. 4 are the right half part schematic diagram of hemispheric gas static-pressure shafting shown in Fig. 3, and Fig. 5 is piston structure shown in Fig. 4 Partial enlarged diagram.

Shown in referring to figures 1-4, hemispheric gas static-pressure shafting provided in this embodiment is applied to accurate and ultraprecise machine Bed field, can also be applied to die industry, national defence and military industry, motion picture machinery, medical instrument, automobile, space flight, electric tool Equal fields.

The hemispheric gas static-pressure shafting includes main shaft 100, bearing 200, motor 300 and outer shaft sleeve 400；100 He of main shaft It is connected between outer shaft sleeve 400 by bearing 200.

Bearing 200 includes bushing 210 and bearing shell 220；Outer shaft sleeve 400, bearing shell 220, bushing 210 and main shaft 100 successively cover It connects, and bushing 210 is fixedly connected with main shaft 100, bearing shell 220 is fixedly connected with outer shaft sleeve 400；Namely outer shaft sleeve 400, bearing shell 220 and bushing 210 all there is through-hole, so as to be socketed main shaft 100 in the through-hole of bushing 210, socked shaft lining in the through-hole of bearing shell 220 210, socked shaft watt 220 in the through-hole of outer shaft sleeve 400.Optionally, bushing 210 is in segment-shaped or billiard table shape；Bearing shell 220 is in ball Annular；That is, bearing shell 220 has cavity corresponding with the shape of bushing 210, so as to have between bearing shell 220 and bushing 210 There is specified gap.Optionally, bearing shell 220 and the interval of main shaft 100 are arranged, so that main shaft 100 is during exercise, main shaft 100 and axis It is not contacted between watts 220, to improve the stationarity and precision of the rotation of main shaft 100.

Bearing shell 220 is made of porous air pervious material；Outer shaft sleeve 400 is provided with the air film air vent being connected to bearing shell 220 (not shown), so that gas enters bearing shell 220 through air film air vent and forms static pressure between bearing shell 220 and bushing 210 Gas film, bushing 210 and main shaft 100 can suspend.It optionally, is sky by the gas that air film air vent supplies Gas, helium, nitrogen or other gases.To a certain extent, the present embodiment bearing 200 can regard gas bearing 200 as.Due to Gas viscosity is low, and viscosity with temperature variation is small, and chemical stability is good, therefore, has friction using the bearing that gas makees lubricant It is small, precision is high, speed is high, temperature rise is low, the service life is long, high-low temperature resistant and atomic radiation, the advantages that host and environmental nonpollution.,

The inside of outer shaft sleeve 400 is arranged in motor 300, and the rotor 310 of motor 300 is sleeved on main shaft 100, motor 300 stator 320 is arranged between the rotor 310 of motor 300 and outer shaft sleeve 400.Optionally, the rotor 310 of motor 300 is fixed It is connected on main shaft 100.Optionally, the rotor 310 of motor 300 is by spline or screw suit on main shaft 100.

Hemispheric gas static-pressure shafting described in the present embodiment, by using bearing shell 220 made of porous air pervious material, with So that gas is entered bearing shell 220 through air film air vent and form pressurized air film between bearing shell 220 and bushing 210, can incite somebody to action Bushing 210 and main shaft 100 suspend, so that main shaft 100 is in and is perhaps substantially at friction-free rotary and avoids or keep away substantially Exempt from the abrasion of main shaft 100, and then improved the stationarity and precision of the rotation of main shaft 100, ensure that Precision Machining components Precision；It is in segment-shaped or billiard table shape by bushing 210, bearing shell 220 is in ball shape, to improve the bearing capacity of bearing 200, into And improve the bearing capacity of hemispheric gas static-pressure shafting；By the way that motor 300, and motor 300 is arranged in the inside of outer shaft sleeve 400 Rotor 310 be sleeved on main shaft 100, the stator 320 of motor 300 be arranged in motor 300 rotor 310 and outer shaft sleeve 400 it Between, enable the stress of main shaft 100 compare balance, hence it is evident that the shadow of unbalance loading caused by reducing the radial force generated by rotor to main shaft It rings, to further increase the stationarity and precision of the rotation of main shaft 100.

In the prior art, motor is rotated by V belt translation driving spindle, and main shaft needs to bear the radial force from motor, The radial force affects the stationarity and precision of main axis to a certain extent, especially in accurate and Ultra-precision Turning field； The rotor 310 of hemispheric gas static-pressure shafting described in the present embodiment, motor 300 is sleeved on main shaft 100, and motor 300 is determined Son 320 is arranged between the rotor 310 of motor 300 and outer shaft sleeve 400, so that the stress that motor 300 acts on main shaft 100 compares Balance, to improve the stationarity and precision of the rotation of main shaft 100, can also improve turning for main shaft 100 substantially without offset loading force Speed.

Shown in referring to figures 1-4, in the optinal plan of the present embodiment, along the axial direction of main shaft 100, at least set on main shaft 100 It is equipped with a pair of bearings 200；

The bearing 200 being arranged in pairs is separately positioned on the two sides of motor 300.By the bearing 200 being arranged to pair, so that main The stress of axis 100 compares balance, to improve the stationarity and precision of the rotation of main shaft 100.

In the optinal plan of the present embodiment, pairs of bearing 200 is symmetrical arranged about motor 300, further to make main shaft 100 stress compares balance, to further increase the stationarity and precision of the rotation of main shaft 100.

In the optinal plan of the present embodiment, outer shaft sleeve 400 include outer race section 410 and with the one-to-one bearing shell of bearing 200 Portions 420；Outer race section 410 is fixedly connected with bearing shell portions 420.By outer race section 410 and bearing shell portions 420, so that hemispheric The structure of gas static-pressure shafting is more reasonable, in order to the production and assembly of hemispheric gas static-pressure shafting.

Optionally, the inside of outer race section 410 is arranged in motor 300；That is: the stator 320 of motor 300 is arranged in motor 300 Rotor 310 and outer race section 410 between.

Optionally, bearing shell 220 is fixedly connected with bearing shell portions 420, and bearing shell 220 and bushing 210 are arranged in bearing shell portions 420 inside；

Optionally, outer race section 410 and/or bearing shell portions 420 are provided with the air film air vent being connected to bearing shell 220；Also It is to say, outer race section 410 is provided with the air film air vent being connected to bearing shell 220 or bearing shell portions 420 are provided with and bearing shell 220 The air film air vent or outer race section 410 and bearing shell portions 420 of connection are provided with the air film air vent being connected to bearing shell 220.It is logical Air film air vent is crossed, so that gas enters bearing shell 220, and permeates bearing shell 220, forms gas between bearing shell 220 and bushing 210 Film, so that main shaft 100 is in or is substantially at friction-free rotary, is kept away so that bushing 210 and main shaft 100 can suspend Exempt from or substantially avoided the abrasion of main shaft 100, and then improve the stationarity and precision of the rotation of main shaft 100, ensure that precision The precision of process component.

Shown in Figure 4, optionally, bearing shell 220 is provided with the axis being connected to air film air vent far from bushing 210 on one side Watt air drain 221；By bearing shell air drain 221, so that the infiltration bearing shell 220 that gas can be more balanced, enters bearing shell 220 and axis Between lining 210 and uniform pressurized air film is formed, and then improves stationarity and precision that main shaft 100 rotates.Optionally, bearing shell The quantity of air drain 221 is multiple；Optionally, multiple bearing shell air drains 221 are arranged along the axially spaced-apart of main shaft；Optionally, bearing shell gas Slot 221 is in a ring.

Shown in referring to figures 1-4, in the optinal plan of the present embodiment, the quantity of bearing 200 is a pair, respectively first axle It holds and second bearing；Correspondingly, the quantity of bearing shell portions 420 is two；Optionally, two bearing shell portions 420 respectively with main shaft 100 both ends are fixedly connected.

The quantity of bearing 200 is a clock synchronization, and the quantity of bushing is two；Optionally, the centre of sphere of ball where two bushings connects Line is the axis of main shaft.

Optionally, along the axial direction of main shaft 100, the first end of main shaft 100 is fixedly connected with main shaft disk 500, main shaft disk 500 with The bushing 210 of first bearing is removable to be fixedly connected；The second end corresponding with first end of main shaft 100 is fixedly connected with ring flange 600, ring flange 600 with the bushing 210 of second bearing is removable is fixedly connected.By main shaft disk 500 in order to jockey, to The workpiece such as process component；It is also convenient for fixed first bearing.It is removable solid by main shaft disk 500 and the bushing 210 of first bearing Fixed connection, in order to adjust the gap between the bushing 210 of first bearing and bearing shell 220, namely is conveniently adjusted first bearing The thickness of the gas film formed between bushing 210 and bearing shell 220, so that the stationarity that main shaft 100 rotates is more preferable, precision is higher. By ring flange 600 in order to the bushing 210 of fixed second bearing, and then fix second bearing.Pass through ring flange 600 and second The bushing 210 of bearing is removable to be fixedly connected, in order to adjust the gap between the bushing 210 of second bearing and bearing shell 220, It is conveniently adjusted the thickness of the gas film formed between the bushing 210 of second bearing and bearing shell 220, so that main shaft 100 rotated Stationarity is more preferable, precision is higher.Optionally, the bushing 210 and main shaft 100 of first bearing pass through screw and main shaft disk 500 respectively Connection；Optionally, ring flange 600 and the bushing 210 of second bearing are connected by screw to；Ring flange 600 and main shaft 100 pass through spiral shell It connects or screw connects.

Optionally, outer race section 410 and bearing shell portions 420 are connected with coaxial locating ring 430, and coaxial locating ring 430 is arranged In the inside of outer race section 410 and the inside of bearing shell portions 420.By coaxial locating ring 430, so that outer race section 410 and bush seat The connection precision in portion 420 is higher, to improve the coaxial performance of outer race section 410 and bearing shell portions 420.Optionally, along main shaft 100 Axial, coaxial locating ring 430 connects bearing shell portions 420 and following coolant jackets 440.

In the optinal plan of the present embodiment, main shaft 100 is internally provided with main shaft inner cavity 110, and main shaft inner cavity 110 is along main shaft 100 axially extending and both ends open；

Along the axial direction of main shaft 100, the first end of main shaft 100 is fixedly connected with main shaft disk 500；Main shaft 100 and first end Corresponding second end is connected with the power air connector 700 being connected to main shaft inner cavity 110；Main shaft disk 500 be provided with in main shaft The main shaft disk chamber 510 that chamber 110 is connected to, so that power air connector 700, main shaft inner cavity 110 and main shaft disk chamber 510 are sequentially communicated, So that the gas source of connection power air connector 700 can supply in main shaft disk chamber 510 or extract the gas of main shaft disk chamber 510, To pass through the workpiece such as fixture, the components to be processed of the pneumatic mode control connection of main shaft disk 500.

Optionally, power air connector 700 is rotatable connector or irrotational connector.Optionally, power supplies Connector 700 is 360 degree of rotatable connectors；In order to connect gas source by power air connector 700.Optionally, pass through power The gas that air connector 700 supplies is air, helium, nitrogen or other gases.

Shown in Figure 2, in the optinal plan of the present embodiment, main shaft disk 500 is fixedly connected on one side far from main shaft 100 Vacuum chuck 800；Vacuum chuck 800 is provided on one side far from main shaft 100 for workpiece such as suction jig, components to be processed Bothrium 810；Bothrium 810 is connected to main shaft disk chamber 510；When being evacuated (namely air-breathing) by power air connector 700, vacuum is inhaled Disk 800 can adsorb the workpiece such as stationary fixture, components to be processed；So that power air connector 700, main shaft inner cavity 110, main shaft Disk chamber 510 and bothrium 810 are sequentially communicated, so that the gas source of connection power air connector 700 can be supplied in bothrium 810 or be taken out The gas for taking bothrium 810 controls the workpiece such as fixture, the components to be processed of the connection of main shaft disk 500 in a manner of through Pneumatic vacuum. When connecting the gas source air-breathing of power air connector 700, vacuum chuck 800 adsorbs stationary fixture, to be processed zero by bothrium 810 The workpiece such as component；When the gas source for connecting power air connector 700 stops suction or supplies, the release absorption of vacuum chuck 800 The workpiece such as fixed fixture, components to be processed.

Optionally, the quantity of bothrium 810 is multiple；Optionally, bothrium 810 is in a ring；Optionally, multiple bothriums 810 are in Annular concentric.

In the present embodiment, main shaft disk 500 can also be fixedly connected with workpiece by other means, connect using other modes are fixed Connect the range that workpiece also belongs to the present embodiment protection.

As shown in figure 3 and figure 4, optionally, in main shaft disk chamber 510 setting has retracts 510 movement tendency of main shaft disk chamber to ginseng , piston 900 for the workpiece such as stationary fixture or components to be processed so that the power of connection power air connector 700 is set It is standby to control piston 900 by pneumatic mode along the axially extended of main shaft 100 or retract main shaft disk chamber 510, so that workpiece Along the axial movement of main shaft 100.Air pressure when connecting the power-equipment gas supply of power air connector 700, in main shaft disk chamber 510 Reach threshold value, air pressure can enable piston 900 move along the direction for stretching out main shaft disk chamber 510, so that stationary fixture or to be processed zero The workpiece such as component are mobile with the mobile direction of piston 900；When connection power air connector 700 power-equipment stop gas supply or When air-breathing, the air pressure in main shaft disk chamber 510 discharges and is lower than certain threshold value, and piston 900 retracts main shaft disk chamber 510, so that fixed The workpiece such as fixture or components to be processed are mobile with the mobile direction of piston 900.

Shown in Figure 5, optionally, piston 900 includes piston extension 910 and is fixedly connected with piston extension 910 Piston bottom portions 920；Piston bottom portions 920 are always positioned in main shaft disk chamber 510, and piston extension 910 is for fixing workpiece And along the axially extended of main shaft 100 or main shaft disk chamber 510 can be retracted, so that the workpiece such as fixture or components to be processed are with work The mobile direction of plug 900 is mobile；When power air connector 700 supplies, gas enters main shaft disk chamber 510 by main shaft inner cavity 110, The air pressure of main shaft disk chamber 510 can enable some or all of stretching main shaft disk chamber 510 of piston extension 910 when reaching threshold value. Optionally, piston extension 910 and piston bottom portions 920 are integrally formed.

Optionally, slide bushing 930 is provided between piston extension 910 and main shaft disk 500；By slide bushing 930, To reduce the frictional force between piston extension 910 and main shaft disk 500, to guarantee the revolving speed of main shaft 100.

Optionally, elastic component 940 is provided between piston bottom portions 920 and main shaft disk 500, elastic component 940, which has to enable, lives It fills in base portion 920 and retracts 510 movement tendency of main shaft disk chamber, so that piston extension 910 has with piston bottom portions 920 retracts master 510 movement tendency of reel chamber.Optionally, elastic component 940 is spring.

Shown in referring to figures 1-4, in the optinal plan of the present embodiment, the quantity of the stator 320 of motor 300 be one or It is multiple；Optionally, the stator 320 of motor 300 is multiple, and it is circumferential that multiple stators 320 are evenly arranged on rotor 310.

Optionally, coolant jacket 440 in a ring is provided between outer shaft sleeve 400 and the stator 320 of motor 300；By cold But set 440 is to cool down stator 320, and then cooling motor 300.

Optionally, the surface that coolant jacket 440 is contacted with outer shaft sleeve 400 is provided with multiple cooling liquid baths 441 having in a ring； Multiple cooling liquid baths 441 are arranged along the axially spaced-apart of main shaft 100；By the way that the multiple of the axially spaced-apart setting along main shaft 100 are arranged Cooling liquid bath 441 in a ring, so that cooling effect is more preferably, preferably to cool down stator 320, and then preferably cooling motor 300。

Optionally, outer shaft sleeve 400 be provided with the coolant liquid loop head (not shown) being connected to cooling liquid bath 441 and Coolant liquid loop exit (not shown).By coolant liquid loop head and coolant liquid loop exit, in order to connect cooling Liquid, to enable the cooling stator 320 of coolant liquid.

The present embodiment also provides a kind of precision equipment.The precision equipment uses above-mentioned hemispheric gas static-pressure shafting.It should Precision equipment can be for example the equipment in the fields such as precision machine tool, motion picture machinery, medical instrument, automobile, space flight, electric tool.

The precision equipment includes hemispheric gas static-pressure shafting, and the raising main shaft with hemispheric gas static-pressure shafting revolves The advantages that stationarity and precision for turning.

Optionally, the workpiece such as the main shaft jockey of hemispheric gas static-pressure shafting, components to be processed.

Finally, it should be noted that the above various embodiments is only to illustrate the technical solution of the utility model, rather than it is limited System；Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should Understand: it is still possible to modify the technical solutions described in the foregoing embodiments, or to some or all of Technical characteristic is equivalently replaced；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution, and this is practical new The range of each embodiment technical solution of type.

Claims (10)

1. a kind of hemispheric gas static-pressure shafting, which is characterized in that including main shaft, bearing, motor and outer shaft sleeve；The main shaft and It is connected between the outer shaft sleeve by the bearing；

The bearing includes bushing and bearing shell；The outer shaft sleeve, the bearing shell, the bushing and the main shaft are successively socketed, and The bushing is fixedly connected with the main shaft, and the bearing shell is fixedly connected with the outer shaft sleeve；The bushing in segment-shaped or Billiard table shape；The bearing shell is in ball shape；

The bearing shell is made of porous air pervious material；The outer shaft sleeve is provided with the air film air vent being connected to the bearing shell, So that gas enters the bearing shell through the air film air vent and forms pressurized air film between the bearing shell and the bushing, The bushing and the main shaft can be suspended；

The bearing shell is provided with the bearing shell air drain being connected to the air film air vent far from the bushing on one side；

The inside of the outer shaft sleeve is arranged in the motor, and the rotor of the motor is sleeved on the main shaft, the motor Stator be arranged between the rotor of the motor and the outer shaft sleeve.

2. hemispheric gas static-pressure shafting according to claim 1, which is characterized in that described along the axial direction of the main shaft At least provided with a pair of bearing on main shaft；

The bearing being arranged in pairs is separately positioned on the two sides of the motor.

3. hemispheric gas static-pressure shafting according to claim 2, which is characterized in that the pairs of bearing is about described Motor is symmetrical arranged；

The bearing shell and the main shaft interval are arranged.

4. hemispheric gas static-pressure shafting according to claim 2, which is characterized in that the outer shaft sleeve include outer race section and With the one-to-one bearing shell portions of the bearing；The outer race section is fixedly connected with the bearing shell portions；

The inside of the outer race section is arranged in the motor；

The bearing shell is fixedly connected with the bearing shell portions, and the bearing shell and the bushing are arranged in the bearing shell portions Portion；

The outer race section and/or the bearing shell portions are provided with the air film air vent；

The quantity of the bearing shell air drain is multiple；Multiple bearing shell air drains are arranged along the axially spaced-apart of the main shaft；The axis Watt air drain is in a ring.

5. hemispheric gas static-pressure shafting according to claim 4, which is characterized in that the quantity of the bearing is a pair, Respectively first bearing and second bearing；Correspondingly, the quantity of the bearing shell portions is two；

Along the axial direction of the main shaft, the first end of the main shaft is fixedly connected with main shaft disk, the main shaft disk and the first axle The bushing held is removable to be fixedly connected；The second end corresponding with first end of the main shaft is fixedly connected with ring flange, the method Blue disk with the bushing of the second bearing is removable is fixedly connected；

The outer race section and the bearing shell portions are connected with coaxial locating ring, and the coaxial locating ring is arranged in the outer race section Inside and the bearing shell portions inside.

6. hemispheric gas static-pressure shafting according to claim 1, which is characterized in that the main shaft is internally provided with main shaft Inner cavity, axially extending and both ends open of the main shaft inner cavity along the main shaft；

Along the axial direction of the main shaft, the first end of the main shaft is fixedly connected with main shaft disk；The main shaft it is corresponding to first end Second end be connected with the power air connector being connected to the main shaft inner cavity；The main shaft disk is provided with and the main shaft inner cavity The main shaft disk chamber of connection.

7. hemispheric gas static-pressure shafting according to claim 6, which is characterized in that the main shaft disk is far from the main shaft Be fixedly connected with vacuum chuck on one side；The suction that is on one side provided with for adsorb workpiece of the vacuum chuck far from the main shaft Slot；The bothrium is connected to the main shaft disk chamber；When being evacuated by the power air connector, the vacuum chuck can be adsorbed Fixed workpiece；

Or,

The intracavitary setting of main shaft disk has the piston for retracting the main shaft disk chamber movement tendency；The piston includes that piston stretches out Portion and the piston bottom portions being fixedly connected with the piston extension；The piston bottom portions are always positioned at the main shaft disk chamber Interior, the piston extension is used to fix workpiece and can be along the axially extended of the main shaft or the retraction main shaft disk chamber； When the power air connector supplies, gas enters the main shaft disk chamber, the gas of the main shaft disk chamber by the main shaft inner cavity Pressure can enable some or all of stretching of the piston extension main shaft disk chamber when reaching threshold value.

8. hemispheric gas static-pressure shafting according to claim 7, which is characterized in that the piston extension and the master Slide bushing is provided between reel；

Elastic component is provided between the piston bottom portions and the main shaft disk, the elastic component, which has, enables the piston bottom portions The main shaft disk chamber movement tendency is retracted, so that the piston extension has with the piston bottom portions retracts the main shaft disk Chamber movement tendency.

9. hemispheric gas static-pressure shafting according to claim 1, which is characterized in that the stator quantity of the motor is one It is a or multiple；

Coolant jacket in a ring is provided between the outer shaft sleeve and the stator of the motor；The coolant jacket and the outer shaft sleeve The surface of contact is provided with multiple cooling liquid baths having in a ring；Multiple cooling liquid baths are set along the axially spaced-apart of the main shaft It sets；

The outer shaft sleeve is provided with the coolant liquid loop head and coolant liquid loop exit being connected to the cooling liquid bath.

10. a kind of precision equipment, which is characterized in that including the described in any item hemispheric gas static-pressure shaftings of claim 1-9.