CN211304794U

CN211304794U - Air cooling structure of air outlet rotor at center of main shaft

Info

Publication number: CN211304794U
Application number: CN201922110957.2U
Authority: CN
Inventors: 叶茂丰
Original assignee: Quanzhou Shengyu Machinery Equipment Co ltd
Current assignee: Quanzhou Shengyu Machinery Equipment Co ltd
Priority date: 2019-11-30
Filing date: 2019-11-30
Publication date: 2020-08-21
Anticipated expiration: 2029-11-30

Abstract

The utility model discloses a main shaft center rotor air-cooling structure of giving vent to anger, including the rotor shaft, the fixed cover in middle part periphery of rotor shaft is equipped with the rotor, the cutter mounting hole has been seted up at the front portion center of rotor shaft, the axial inlet port has been seted up at the rear portion center of rotor shaft, the helicla flute of ventilating has been seted up to the middle part periphery of rotor shaft, the preceding tip lateral wall of axial inlet port is seted up at least one and the helicla flute rear end that ventilates communicates with each other radial inlet port, the rear end portion lateral wall of cutter mounting hole is seted up at least one and is ventilated the communicating radial venthole of helic. When the main shaft works, cooling air is sent into the axial air inlet hole, then enters the ventilation spiral groove from the radial air inlet hole, the rotor is cooled, then enters the cutter mounting hole from the radial air outlet hole, and finally is discharged from the front end of the main shaft. The utility model discloses a blow and take away partly the heat that gives off the rotor, reduce the hot extension length of axle core, guarantee processing plane high accuracy.

Description

Air cooling structure of air outlet rotor at center of main shaft

Technical Field

The utility model belongs to the technical field of the main shaft, concretely relates to main shaft center rotor air-cooling structure of giving vent to anger.

Background

The electric main shaft is a new technology which integrates a machine tool main shaft and a main shaft motor into a whole and appears in the field of numerical control machine tools, and the electric main shaft, a linear motor technology and a high-speed cutter technology can push high-speed processing to a new era. At present, in the machining process of a main shaft, a rotor generates a large amount of heat in the rotating process, so that a shaft core (namely the middle part of a rotor shaft) generates a serious thermal extension phenomenon, the thermal extension length is too large, the precision of a machining plane is reduced, and the machining precision requirement cannot be met.

SUMMERY OF THE UTILITY MODEL

In view of the deficiencies of the prior art, an object of the present invention is to provide a spindle center air-out rotor air-cooling structure capable of improving the phenomenon of thermal extension of the spindle core.

In order to solve the technical problem, the utility model discloses a technical scheme is: the air cooling structure of the air outlet rotor at the center of the main shaft comprises a rotor shaft, wherein a rotor is fixedly sleeved on the periphery of the middle of the rotor shaft, a cutter mounting hole is formed in the center of the front portion of the rotor shaft, an axial air inlet hole is formed in the center of the rear portion of the rotor shaft, an air ventilation spiral groove is formed in the periphery of the middle of the rotor shaft, at least one radial air inlet hole communicated with the rear end of the air ventilation spiral groove is formed in the side wall of the front end portion of the axial air inlet hole, and at least one radial air outlet hole communicated with the front end of the air ventilation spiral groove.

Preferably, still including casing, bearing frame and the hou gai that is the tube-shape, the anterior periphery of rotor shaft is installed in the casing through the front bearing, the rear portion periphery of rotor shaft is installed in the bearing frame through the rear bearing, bearing frame fixed mounting is on the rear end face of casing, the fixed stator that inlays in the inner chamber middle part of casing is equipped with and encircles outside the rotor, back lid fixed mounting is on the rear end face of bearing frame, the through-hole has been seted up at the center of back lid, the air inlet seat is worn to be equipped with to the through-hole department is fixed, the air vent has been seted up at the center of air inlet seat, the front portion of air inlet seat stretches into in the radial air inlet and the two clearance fit, the front end and the radial air inlet of air vent communicate with each other, air.

Preferably, the oil retaining device further comprises a front nut, an oil retaining cover, a small front cover and a small front cover, wherein the front nut is fixedly locked on an external thread on the front portion of the rotor shaft, the oil retaining cover is fixedly installed on the outer edge of the front end of the shell, the small front cover is fixedly installed on the inner edge of the front end of the shell to position the front end face of the outer ring of the front bearing, the small front cover is fixedly installed on the front end face of the small front cover, and the small front cover are in clearance fit with the front nut.

Preferably, a first annular groove with an outward opening is formed in the outer peripheral side of the front portion of the front nut, the diameter of the front side wall of the first annular groove is smaller than that of the rear side wall of the first annular groove, the front sealing cover is provided with a first annular convex portion extending into the first annular groove, a second annular groove with a backward opening is formed in the rear end of the front nut, the length of the outer side wall of the second annular groove is smaller than that of the inner side wall, and the front small cover is provided with a second annular convex portion extending into the second annular groove.

Preferably, a plurality of first oil ducts which are uniformly distributed at intervals are formed in the side wall of the shell, the first oil ducts penetrate through the front end face and the rear end face of the shell, a second oil duct corresponding to one of the first oil ducts is formed in the edge portion of the bearing block, a third oil duct corresponding to the second oil duct is formed in the edge portion of the rear cover, an oil inlet joint is installed at a rear port of the third oil duct, a plurality of rear communicating grooves which are uniformly distributed at intervals and used for communicating the two adjacent first oil ducts are formed in the rear end face of the shell, and a plurality of front communicating grooves which are uniformly distributed at intervals and used for communicating the two adjacent first oil ducts are formed in the rear end face of the oil blocking cover.

Preferably, the rotor shaft further comprises a balance ring, a rear nut and a rear sealing cover, the balance ring is sleeved at the rear part of the rotor shaft, the rear end of the balance ring extends into the bearing seat and abuts against the front end face of the inner ring of the rear bearing, the rear nut is fixedly locked on the external thread of the rear end part of the rotor shaft to abut against the rear end face of the inner ring of the rear bearing, the rear sealing cover is fixedly installed on the rear end face of the bearing seat, and the rear sealing cover covers the rear bearing and the rear nut.

Preferably, the bearing seat further comprises a spring seat, the spring seat is movably embedded in the inner cavity of the bearing seat and abuts against the front end face of the outer ring of the rear bearing, a plurality of seat holes which are uniformly distributed are formed in the spring seat, a spring abutting against an inner flange at the front end of the bearing seat is installed in each seat hole, and a gasket is arranged between each spring and the inner flange at the front end of the bearing seat.

Preferably, a first threading hole for a line to pass through is formed in the bearing seat, a second threading hole is formed in the rear cover, an avoiding notch is formed in the rear sealing cover, and the first threading hole is communicated with the second threading hole through the avoiding notch.

Preferably, the peripheral side wall of the rear cover is provided with an air outlet drain hole.

Compared with the prior art, the utility model discloses following beneficial effect has: when the main shaft works, cooling air is sent into the axial air inlet hole, then enters the ventilation spiral groove from the radial air inlet hole, the rotor is cooled, then enters the cutter mounting hole from the radial air outlet hole, and finally is discharged from the front end of the main shaft. In the processing process of the air-cooling structure of the air-out rotor in the center of the main shaft, part of heat emitted by the rotor is taken away by blowing, the hot extension length of a shaft core (namely the middle part of a rotor shaft) is reduced, and the high precision of a processing plane is ensured.

Drawings

Fig. 1 is a structural sectional view of an embodiment of the present invention.

The labels in the figure are: 1. a rotor; 2. a short circuit ring; 3. a front bearing; 4. a rear bearing; 5. a stator; 6. an air inlet seat; 7. an air inlet joint; 8. an oil inlet joint; 9. a spring seat; 10. a rotor shaft; 11. a cutter mounting hole; 12. an axial air inlet; 13. a ventilation spiral groove; 14. a radial air inlet; 15. a radial air outlet hole; 20. a housing; 21. a first oil passage; 30. a bearing seat; 31. a second oil passage; 32. a first threading hole; 40. a rear cover; 41. a third oil passage; 42. a second threading hole; 43. an air outlet drain hole; 50. a front nut; 60. an oil blocking cover; 61. a front communicating groove; 70. a front small cover; 80. a front sealing cover; 90. a balance ring; 100. a back nut; 110. a rear sealing cover; 111. avoiding the gap.

Detailed Description

In order to make the aforementioned and other features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

As shown in fig. 1, the present embodiment provides a spindle center air outlet rotor air cooling structure, which includes a rotor shaft 10, a rotor 1 is fixedly sleeved on the middle periphery of the rotor shaft 10, a cutter mounting hole 11 is formed in the front center of the rotor shaft 10, an axial air inlet hole 12 is formed in the rear center of the rotor shaft 10, an air ventilation spiral groove 13 is formed in the middle periphery of the rotor shaft 10, at least one radial air inlet hole 14 communicated with the rear end of the air ventilation spiral groove 13 is formed in the side wall of the front end portion of the axial air inlet hole 12, and at least one radial air outlet hole 15 communicated with the front end of the air ventilation spiral groove 13 is formed in the side wall of the rear end portion of the cutter. Wherein, the front and back ends of the rotor 1 are respectively provided with a short circuit ring 2.

In this embodiment, the spindle center air outlet rotor air cooling structure further includes a cylindrical housing 20, a bearing seat 30 and a rear cover 40, the front periphery of the rotor shaft 10 is installed in the housing 20 through front bearings 3 (specifically, two front bearings 3 with a front spacer ring therebetween), the rear periphery of the rotor shaft 10 is installed in the bearing seat 30 through rear bearings 4 (specifically, two rear bearings 4 with a rear spacer ring therebetween), the bearing seat 30 is fixedly installed on the rear end face of the housing 20, a stator 5 surrounding the rotor 1 is fixedly embedded in the middle of the inner cavity of the housing 20, the rear cover 40 is fixedly installed on the rear end face of the bearing seat 30, a through hole is formed in the center of the rear cover 40, an air inlet seat 6 is fixedly inserted in the through hole, a vent hole is formed in the center of the air inlet seat 6, the front of the air inlet seat 6 extends into the radial air inlet 14 and the two are in clearance fit, the front end of the vent hole is communicated with a radial air inlet hole 14, and the rear end of the vent hole is provided with an air inlet joint 7 which is convenient for externally connecting an air inlet pipe.

In this embodiment, the spindle center air outlet rotor air cooling structure further includes a front nut 50, an oil blocking cover 60, a front small cover 70 and a front sealing cover 80, the front nut 50 is fixedly locked on the front external thread of the rotor shaft 10, the oil blocking cover 60 is fixedly installed at the front end outer edge of the housing 20, the front small cover 70 is fixedly installed at the front end inner edge of the housing 20 to position the outer ring front end face of the front bearing 3, the front sealing cover 80 is fixedly installed at the front end face of the front small cover 70, and the front sealing cover 80 and the front small cover 70 are both in clearance fit with the front nut 50, so that the front sealing cover 80 and the front small cover 70 are prevented from interfering with the rotation of the front nut 50.

In this embodiment, the front outer peripheral side of the front nut 50 is provided with a first annular groove (not labeled in the figure) with an outward opening, the diameter of the front side wall of the first annular groove is smaller than that of the rear side wall, the front sealing cover 80 is provided with a first annular protrusion (not labeled in the figure) extending into the first annular groove, the rear end of the front nut 50 is provided with a second annular groove (not labeled in the figure) with a backward opening, the length of the outer side wall of the second annular groove is smaller than that of the inner side wall, the front small cover 70 is provided with a second annular protrusion (not labeled in the figure) extending into the second annular groove, a circuitous blocking structure is formed by the cooperation of the first annular groove with a drop height at the front and rear side walls and the first annular protrusion and the cooperation of the second annular groove with a drop height at the inner and outer side walls, and the inner cavity of the housing 20 of the spindle can effectively prevent impurities such as, the service life of the main shaft is prolonged.

In this embodiment, a plurality of first oil ducts 21 distributed at even intervals are formed in the side wall of the housing 20, the first oil duct 21 penetrates through the front and rear end faces of the housing 20, the edge portion of the bearing block 30 is provided with a second oil duct 31 corresponding to one of the first oil ducts 21, the edge portion of the rear cover 40 is provided with a third oil duct 41 corresponding to the second oil duct 31, an oil inlet joint 8 is installed at a rear port of the third oil duct 41, an external oil inlet pipe is convenient to connect, the rear end face of the housing 20 is provided with a plurality of rear communicating grooves (omitted in the drawing) distributed at even intervals and used for communicating two adjacent first oil ducts 21, the rear end face of the oil blocking cover 60 is provided with a plurality of front communicating grooves 61 distributed at even intervals and used for communicating two adjacent first oil ducts 21, the housing 20 is cooled by cooling oil, and the cooling effect is good.

In this embodiment, this main shaft center rotor air-cooling structure of giving vent to anger still includes compensating ring 90, back nut 100 and rear seal lid 110, compensating ring 90 cover is established at the rear portion of rotor shaft 10, compensating ring 90's rear end stretches into in the bearing frame 30 and withstands the preceding terminal surface of the inner circle of back bearing 4, back nut 100 is fixed to be locked on the rear end portion external screw thread of rotor shaft 10 in order to withhold the inner circle rear end face of back bearing 4, rear seal lid 110 fixed mounting is on the rear end face of bearing frame 30, rear seal lid 110 covers back bearing 4 and back nut 100, avoids in impurity such as dust, water gets into back bearing 4, improves the life of back bearing 4.

In this embodiment, the spindle center air outlet rotor air cooling structure further includes a spring seat 9, the spring seat 9 is movably embedded in an inner cavity of the bearing seat 30 and abuts against a front end face of an outer ring of the rear bearing 4, a plurality of seat holes are formed in the spring seat 9 and are uniformly distributed, a spring (not marked in the figure) abutting against an inner flange at the front end of the bearing seat 30 is installed in each seat hole, a gasket (not marked in the figure) is arranged between the spring and the inner flange at the front end of the bearing seat 30, and the position of the rear bearing 4 is adjusted in a floating manner through the spring and the spring seat 9.

In this embodiment, the bearing seat 30 is provided with a first threading hole 32 through which a line passes, the rear cover 40 is provided with a second threading hole 42, the rear sealing cover 110 is provided with an avoidance notch 111, and the first threading hole 32 is communicated with the second threading hole 42 through the avoidance notch 111 to be connected with the stator 5 through a wire. The peripheral side wall of the rear cover 40 is provided with an air outlet drain hole 43 for conveniently discharging hot air and cooling water.

The working principle of the embodiment is as follows: when the main shaft works, cooling air firstly enters the air inlet seat 6 through the air inlet joint 7, then enters the axial air inlet hole 12, then enters the ventilation spiral groove 13 through the radial air inlet hole 14 to cool the rotor 1, then enters the cutter mounting hole 11 through the radial air outlet hole 15, and finally is discharged from the front end of the main shaft. In the air-cooled structure of the air-out rotor in the center of the main shaft, part of heat emitted by the rotor 1 is taken away by blowing, the thermal extension length of a shaft core (namely the middle part of the rotor shaft 10) is reduced, and the high precision of a processing plane is ensured.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any person skilled in the art should not depart from the technical scope of the present invention, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the scope of the present invention.

Claims

1. The utility model provides a main shaft center rotor air-cooling structure of giving vent to anger, includes the rotor shaft, the fixed cover in middle part periphery of rotor shaft is equipped with the rotor, the cutter mounting hole has been seted up at the anterior center of rotor shaft, its characterized in that: the axial air inlet hole is formed in the center of the rear portion of the rotor shaft, the ventilation spiral groove is formed in the periphery of the middle of the rotor shaft, at least one radial air inlet hole communicated with the rear end of the ventilation spiral groove is formed in the side wall of the front end portion of the axial air inlet hole, and at least one radial air outlet hole communicated with the front end of the ventilation spiral groove is formed in the side wall of the rear end portion of the cutter mounting hole.

2. The spindle center air outlet rotor air cooling structure of claim 1, wherein: still including casing, bearing frame and the hou gai that is the tube-shape, the anterior periphery of rotor shaft passes through the front bearing and installs in the casing, the rear portion periphery of rotor shaft passes through the rear bearing and installs in the bearing frame, bearing frame fixed mounting is on the rear end face of casing, the fixed stator that encircles outside the rotor that inlays in the inner chamber middle part of casing, back lid fixed mounting is on the rear end face of bearing frame, the through-hole has been seted up at the center of back lid, the air inlet seat has been worn to be equipped with to the through-hole department is fixed, the air vent has been seted up at the center of air inlet seat, the front portion of air inlet seat stretches into in the radial air inlet and the two clearance fit, the front end and the radial air inlet of air vent communicate with each other.

3. The spindle center air outlet rotor air cooling structure of claim 2, wherein: the front nut is fixedly locked on the external thread at the front part of the rotor shaft, the oil blocking cover is fixedly arranged at the outer edge of the front end of the shell, the front small cover is fixedly arranged at the front end inner edge of the shell and is used for positioning the front end face of the outer ring of the front bearing, the front sealing cover is fixedly arranged at the front end face of the front small cover, and the front sealing cover and the front small cover are in clearance fit with the front nut.

4. The spindle center air outlet rotor air cooling structure of claim 3, wherein: the front sealing cover is characterized in that a first annular groove with an outward opening is formed in the outer peripheral side of the front portion of the front nut, the diameter of the front side wall of the first annular groove is smaller than that of the rear side wall of the first annular groove, the front sealing cover is provided with a first annular convex portion stretching into the first annular groove, a second annular groove with an inward opening is formed in the rear end of the front nut, the length of the outer side wall of the second annular groove is smaller than that of the inner side wall, and the front small cover is provided with a second annular convex portion stretching into the second annular groove.

5. The spindle center air outlet rotor air cooling structure of claim 3, wherein: the oil-retaining cover is characterized in that a plurality of first oil ducts which are evenly distributed at intervals are formed in the side wall of the shell, the first oil ducts penetrate through the front end face and the rear end face of the shell, a second oil duct corresponding to one of the first oil ducts is formed in the edge portion of the bearing seat, a third oil duct corresponding to the second oil duct is formed in the edge portion of the rear cover, an oil inlet joint is installed at the rear end port of the third oil duct, a plurality of rear communicating grooves which are evenly distributed at intervals and used for communicating the two adjacent first oil ducts are formed in the rear end face of the shell, and a plurality of front communicating grooves which are evenly distributed at intervals and used for communicating the two adjacent first oil ducts are formed in the rear end.

6. The spindle center air outlet rotor air cooling structure of claim 2, wherein: the rear end of the balance ring extends into the bearing seat and abuts against the front end face of the inner ring of the rear bearing, the rear nut is fixedly locked on the external thread of the rear end part of the rotor shaft and abuts against the rear end face of the inner ring of the rear bearing, the rear sealing cover is fixedly installed on the rear end face of the bearing seat, and the rear sealing cover covers the rear bearing and the rear nut.

7. The spindle center air outlet rotor air cooling structure of claim 6, wherein: the spring seat is movably embedded in an inner cavity of the bearing seat and abuts against the front end face of an outer ring of the rear bearing, a plurality of seat holes which are uniformly distributed are formed in the spring seat, a spring abutting against an inner flange at the front end of the bearing seat is installed in each seat hole, and a gasket is arranged between each spring and the inner flange at the front end of the bearing seat.

8. The spindle center air outlet rotor air cooling structure of claim 6, wherein: the bearing seat is provided with a first threading hole for a line to pass through, the rear cover is provided with a second threading hole, the rear sealing cover is provided with an avoidance notch, and the first threading hole is communicated with the second threading hole through the avoidance notch.

9. The spindle center air outlet rotor air cooling structure of claim 2, wherein: and the peripheral side wall of the rear cover is provided with an air outlet drain hole.