CN212121674U

CN212121674U - Pneumatic automatic tool changing superspeed electric spindle

Info

Publication number: CN212121674U
Application number: CN202020500119.6U
Authority: CN
Inventors: 叶茂丰
Original assignee: Quanzhou Shengyu Machinery Equipment Co ltd
Current assignee: Quanzhou Shengyu Machinery Equipment Co ltd
Priority date: 2020-04-08
Filing date: 2020-04-08
Publication date: 2020-12-11
Anticipated expiration: 2030-04-08

Abstract

The utility model discloses a pneumatic automatic tool changing hypervelocity electricity main shaft, which comprises a housin, the dabber, lid and cylinder are connected to the back, the dabber rotates and installs in the casing, the axial through-hole has been seted up at the center of dabber, slide in the axial through-hole and wear to be equipped with the pull rod, install the belleville spring that makes the pull rod reset backward in the rear portion of axial through-hole, HSK draws the claw is installed to the front end of pull rod, back connection lid fixed mounting is in the rear end of casing, the broach inlet port has been seted up on the connection lid of back, the cylinder body fixed mounting of cylinder is in the rear end of connection lid, well core rod position. The electric spindle adopts the HSK pull claw with high precision and strong cutter clamping force, so that the safety is improved when a workpiece is machined at high speed; meanwhile, the special design of the air cylinder is adopted, and the distance between the pull rod and the piston can be effectively increased through the first spring under the condition of sudden power failure or insufficient air supply pressure, so that high-speed friction is avoided, the protection effect is achieved, and the service life of the electric spindle is prolonged.

Description

Pneumatic automatic tool changing superspeed electric spindle

Technical Field

The utility model belongs to the technical field of the main shaft, concretely relates to pneumatic automatic tool changing hypervelocity electricity main shaft.

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, a pull claw of a pneumatic tool changing electric spindle has the defects of low precision and weak tool clamping capacity, and a cylinder of the pneumatic tool changing electric spindle generally consists of a cylinder body, a cylinder cover and a piston; in the tool changing process, if power failure or insufficient air supply pressure occurs suddenly, the pull rod of the electric spindle is contacted with the piston to generate high-speed friction, the electric spindle is easy to damage, and the service life is shortened.

SUMMERY OF THE UTILITY MODEL

In view of the deficiencies of the prior art, an object of the present invention is to provide a pneumatic automatic tool changing super high speed motorized spindle to solve the above technical problem.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a pneumatic automatic tool changing ultra-high-speed electric spindle comprises a shell, a mandrel, a rear connecting cover and a cylinder, wherein the mandrel is rotatably arranged in the shell, an axial through hole is formed in the center of the mandrel, a pull rod penetrates through the axial through hole in a sliding mode, a disc spring enabling the pull rod to reset backwards is arranged in the rear portion of the axial through hole, an HSK (high speed kinematic) pull claw is arranged at the front end of the pull rod, the rear connecting cover is fixedly arranged at the rear end of the shell, and a broach air inlet hole is formed in the rear connecting cover; the cylinder includes the inner casing body, cylinder body, the sealed lid of back and piston, cylinder body fixed mounting is in the rear end of back connection lid, the rear end of the inner casing body is installed in the front end of cylinder body, the inner casing body front end is worn to locate in the rear end of back connection lid, set up the broach intake duct in leading to the cylinder body in the inner casing body, the broach intake duct is linked together with the broach inlet port, piston slidable mounting is in the middle part of cylinder body, well core rod of piston passes the inner casing body and is located the pull rod behind, a plurality of evenly distributed's first spring locating hole has been seted up to the rear end face of the inner casing body, install the first spring that withstands the piston backward in the first spring locating hole, the sealed rear end of installing in the cylinder body of back, the knife loosening inlet port has been seted up on the sealed lid.

Preferably, the back is connected and is covered still to have seted up main shaft center inlet port, still set up the first main shaft center intake duct that is linked together with main shaft center inlet port in the endotheca body, the gas outlet of first main shaft center intake duct is located the central through-hole inside wall of the endotheca body, second main shaft center intake duct has been seted up in the well core rod of piston, the gas outlet of second main shaft center intake duct is located well core rod front end face of piston, the annular air inlet of second main shaft center intake duct aligns with the gas outlet of first main shaft center intake duct when well core rod of piston stretches out completely.

Preferably, the cylinder body includes a plurality of series connection's sub-cylinder body in proper order, interior cover body installs in the front end of the sub-cylinder body of front most, the sealed rear end of installing in the sub-cylinder body of front most, the cylinder body has the slip chamber that distributes around a plurality of in proper order, the piston includes a plurality of sub-pistons, sub-piston slidable mounting is in the slip intracavity that corresponds, and the well core rod of the sub-piston of front most passes the interior cover body and is located the pull rod directly behind, and well core rod of all the other sub-pistons all stretches into adjacent preceding slip intracavity, and the air vent of two adjacent slip chambers of intercommunication is all seted up at the center of all the other sub-pistons, the gas outlet and the most preceding slip chamber of broach intake duct are linked together, the pine sword intake port is linked together with.

Preferably, the cylinder still includes the back lid, the back sealed lid is installed in the rear end of cylinder body and is fixed its rear side by the jump ring, the back lid is detained and is established in the rear end of cylinder body, the back lid is through a plurality of evenly distributed's screw and back sealed lid fixed connection.

Preferably, the rear end periphery of pull rod is provided with the response platform, install in the front end of back connection lid and cooperate with the sensor that the response pull rod stretches out with the response platform, still install in the front end of back connection lid and be used for responding to cylinder piston well core rod and stretch out in order to produce the proximity switch of automatic tool changing signal.

Preferably, electricity main shaft still includes interior nut, front nut, balanced nut, oil baffle lid, atmoseal ring and preceding sealed lid, the anterior periphery of dabber is installed in the front end of casing through the front bearing, interior nut fixed mounting is in the front end of casing and withstands the outer lane front end face of front bearing, front nut fixed mounting is in the front portion of dabber and withstands the inner circle front end face of front bearing, balanced nut fixed mounting is on the front portion of dabber and withstands front nut front end face, oil baffle lid fixed mounting is in the front end outer fringe of casing, atmoseal ring fixed mounting is in the front end inner edge department of casing, preceding sealed lid fixed mounting is in the front side of atmoseal ring, front nut respectively with interior nut, atmoseal ring clearance fit, balanced nut and atmoseal ring clearance fit.

Preferably, the fixed cover in middle part periphery of dabber is equipped with the rotor, both ends all are provided with the short circuit ring around the rotor, the fixed stator that inlays and be equipped with and rotor matched with in middle part in the casing.

Preferably, the electric spindle further comprises a bearing seat, a steel ball retainer, a balance ring, a rear nut, a balance gland, a spring seat and a middle sealing cover, the periphery of the bearing seat is arranged in the shell in a sliding way through a steel ball retainer, the periphery of the rear part of the mandrel is arranged in the bearing seat through a rear bearing, the balance ring is sleeved at the rear part of the mandrel and props against the front end face of the inner ring of the rear bearing, the rear nut is fixedly arranged at the rear part of the mandrel and props against the rear end face of the inner ring of the rear bearing, the balance gland is fixedly sleeved at the rear end of the mandrel, the spring seat is arranged in the shell and positioned at the front side by a step in the shell, a plurality of second spring positioning holes which are uniformly distributed are formed in the front end surface of the bearing seat, a second spring which is forwards propped against the rear side of the spring seat is arranged in each second spring positioning hole, the middle sealing cover is fixedly arranged on the rear end face of the bearing seat and covers the rear bearing and the rear nut.

Compared with the prior art, the utility model discloses following beneficial effect has: the electric spindle belongs to an ultra-high-speed electric spindle, the rotating speed of the electric spindle reaches 30000 r/m, the electric spindle is used for high-precision part machining, and the HSK pull claw with high precision and strong cutter clamping force is adopted, so that the safety is improved when a workpiece is machined at a high speed; meanwhile, the special-design cylinder is adopted, the first spring is additionally arranged on the cylinder to realize piston resetting, and the distance between the pull rod and the piston can be effectively increased under the condition of sudden power failure or insufficient air supply pressure in the tool changing process, so that high-speed friction cannot be generated, the protection effect is achieved, and the service life of the electric spindle is prolonged.

Drawings

Fig. 1 is a cross-sectional view of the overall structure of the electric spindle according to the embodiment of the present invention.

Fig. 2 is an enlarged view of the front structure of the electric spindle according to the embodiment of the present invention.

Fig. 3 is an enlarged view of the rear structure of the electric spindle according to the embodiment of the present invention.

Fig. 4 is a sectional view of a cylinder structure according to a first embodiment of the present invention.

The labels in the figure are: 1. a housing; 2. a mandrel; 3. a rear connecting cover; 5. a pull rod; 6. a disc spring; 7. a broach air inlet hole; 8. a main shaft center air inlet hole; 9. a third main shaft center air inlet channel; 10. an induction table; 11. a sensor; 12. a proximity switch; 13. an inner nut; 14. a front nut; 15. a balance nut; 16. an oil blocking cover; 17. an air seal ring; 18. a front sealing cover; 19. a front bearing; 20. an axial air passage; 21. a transition gas passage; 22. a radial air passage; 23. a rotor; 24. a stator; 25. a short circuit ring; 26. a bearing seat; 27. a steel ball retainer; 28. a balance ring; 29. a back nut; 30. a balance gland; 31. a spring seat; 32. a middle sealing cover; 33. a rear bearing; 34. a second spring positioning hole; 35. a second spring; 100. a cylinder; 110. an inner sleeve body; 111. a broach air intake; 112. a first spring positioning hole; 113. a first spindle center inlet; 120. a cylinder body; 121/122, sub-cylinder body; 130. a rear sealing cover; 131. a cutter loosening air inlet hole; 140. a piston; 141/142/143/144, sub-piston; 145. an air duct; 146. a seal ring; 147. an air guide groove; 148. a second spindle center inlet channel; 150. a first spring; 160. a rear cover; 170. a clamp spring; 180. sealing the spacer; 190. and (4) exhausting holes.

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 to 4, the present embodiment provides a pneumatic automatic tool changing ultrahigh-speed motorized spindle, which includes a housing 1, a mandrel 2, a rear connection cover 3 and a cylinder 100, wherein the mandrel 2 is rotatably installed in the housing 1, an axial through hole is formed in the center of the mandrel 2, a pull rod 5 is slidably inserted into the axial through hole, an HSK pull claw (omitted in the drawing) is installed at the front end of the pull rod 5, a disc spring 6 for returning the pull rod 5 backward is installed in the rear portion of the axial through hole, the rear connection cover 3 is fixedly installed at the rear end of the housing 1, and a broach air inlet 7 is formed in the rear connection cover 3; the cylinder 100 includes an inner jacket body 110, a cylinder body 120, a rear packing cap 130 and a piston 140, the cylinder body 120 is fixedly installed at the rear end of the rear connection cover 3, the rear end of the inner sleeve body 110 is installed at the front end of the cylinder body 120, the front end of the inner sleeve body 110 is arranged in the rear end of the rear connecting cover 3 in a penetrating way, a broach air inlet channel 111 leading to the cylinder body 120 is arranged in the inner sleeve body 110, the broach air inlet channel 111 is communicated with a broach air inlet hole 7, the piston 140 is slidably arranged in the middle of the cylinder body 120 and is positioned right behind the pull rod 5, the central rod of the piston 140 passes through the inner sleeve body 110, the rear end surface of the inner sleeve body 110 is provided with a plurality of first spring positioning holes 112 which are uniformly distributed, a first spring 150 is installed in the first spring positioning hole 112 and is pressed against the piston 140 backwards, the rear sealing cover 130 is installed at the rear end of the cylinder body 120, and a cutter loosening air inlet hole 131 is formed in the rear sealing cover 130.

In the embodiment, in order to cool the inner cavity of the electric spindle, the rear connecting cover 3 is further provided with a spindle center air inlet hole 8, a first main shaft center air inlet channel 113 communicated with the main shaft center air inlet hole 8 is also arranged in the inner sleeve body 110, the air outlet of the first main shaft central air inlet 113 is positioned on the inner side wall of the central through hole of the inner sleeve body 110, a second main shaft central air inlet channel 148 is formed in the central rod of the piston 140 (specifically the foremost sub-piston 141 described below), the outlet of the second main shaft center air inlet channel 148 is located on the central shaft front end surface of the piston 140 (which may be specifically the foremost sub-piston 141 described below), the annular inlet of the second main shaft center inlet channel 148 is aligned with the outlet of the first main shaft center inlet channel 113 when the center rod of the piston 140 (which may be specifically the foremost sub-piston 141 described below) is fully extended.

In this embodiment, the cylinder 120 includes a plurality of (two in the figure) sub-cylinders 121, 122 connected in series in sequence, the inner sleeve 110 is installed at the front end of the foremost sub-cylinder 121, the rear seal cover 130 is installed at the rear end of the rearmost sub-cylinder 122, the cylinder 120 has a plurality of (four in the figure) sliding cavities distributed in sequence, the piston 140 includes a plurality of (four in the figure) sub-pistons 141, 142, 143, 144, the sub-pistons 141, 142, 143, 144 are slidably installed in the corresponding sliding cavities, a central rod of the foremost sub-piston 141 passes through the inner sleeve 110, central rods of the remaining

sub-pistons

142, 143, 144 all extend into the adjacent foremost sliding cavity, the centers of the remaining

sub-pistons

142, 143, 144 are all provided with an air duct 145 communicating the adjacent two sliding cavities, and an air outlet of the air duct of the broach 111 is communicated with the foremost sliding cavity, the cutter loosening air inlet hole 131 is communicated with the rearmost sliding cavity. The foremost sub-cylinder 121 itself is formed with two sliding cavities, and the last sub-cylinder 122 is divided into two sliding cavities by a clamp spring 170 and a sealing spacer 180. When the cutter is changed, a certain air pressure is introduced into the cutter loosening air inlet hole 131, at this time, the air pressure passes through the plurality of

sub-pistons

144, 143, 142 and 141 and the

sub-cylinder bodies

122 and 121 from back to front, the

next sub-piston

144, 143 and 142 pushes up the

previous sub-piston

143, 142 and 141, so that the foremost sub-piston 141 is burst out to generate strong propelling force at the working moment, and the central rod of the foremost sub-piston 141 is pushed out; a certain air pressure is introduced into the broach air inlet 111, and then the air pressure passes through the plurality of

sub-cylinders

121 and 122 and the

sub-pistons

141, 142, 143 and 144 from front to back, so that the

sub-pistons

141, 142, 143 and 144 are quickly returned.

An annular sealing groove is formed in the outer peripheral side of the piston 140 (specifically, each of the

sub-pistons

141, 142, 143, and 144), a sealing ring 146 (such as a star-shaped sealing ring) is embedded in the annular sealing groove, and the piston 140 (specifically, each of the

sub-pistons

141, 142, 143, and 144) is in sealing contact with the inner wall of the cylinder body 120 (specifically, the corresponding sub-cylinder bodies 121 and 122) through the sealing ring 146; an air guide groove 147 is formed in the center of the rear end face of the piston 140 (specifically, each sub-piston 141, 142, 143, 144), the size of the air guide groove 147 is larger than the outer diameter of the central rod, compressed air can be well guided to enter an air channel 145 in the piston 140 (specifically, the

rest sub-pistons

142, 143, 144) through the air guide groove 147, and the

next sub-piston

142, 143, 144 pushes the

previous sub-piston

141, 142, 143 to advance layer by layer. Among them, the cylinder block 120 is preferably made of an aluminum material, and the piston 140 is preferably made of a stainless steel material, because the air compressor generates a large amount of moisture, the stainless steel piston is prevented from rusting, and has high rigidity.

In this embodiment, the cylinder 100 further includes a rear cover 160, the rear sealing cover 130 is installed in the rear end of the cylinder body 120 and fixed at the rear side thereof by another clamp spring 170, the rear cover 160 is fastened to the rear end of the cylinder body 120, and the rear cover 160 is fixedly connected to the rear sealing cover 130 by a plurality of uniformly distributed screws.

Specifically, the inner sleeve 110 is embedded between the rear end of the rear connecting cover 3 and the front end of the foremost sub-cylinder 121, the rear sealing cover 130 is installed in the rear end of the rearmost sub-cylinder 122, and the center rod of the foremost sub-piston 141 is located right behind the pull rod 5 to push the pull rod 5 to advance. In addition, a main shaft center air inlet hole 8 communicated with the first main shaft center air inlet channel 113 is further formed in the rear connecting cover 3, and cooling air enters the inner cavity of the shell 1 after passing through the main shaft center air inlet hole 8, the first main shaft center air inlet channel 113 and the second main shaft center air inlet channel 148 in sequence, so that the motor is cooled; the center of pull rod 5 runs through and sets up third main shaft center intake duct 9 relative with second main shaft center intake duct 148 gas outlet, and the cooling air loops through main shaft center inlet port 8, first main shaft center intake duct 113, second main shaft center intake duct 148 and third main shaft center intake duct 9 after to installing the cutter that HSK draws the claw and blow the cooling.

In the present embodiment, the rear end of the pull rod 5 is provided with an induction table 10 at the periphery, and the front end of the rear connection cover 3 is internally provided with a sensor 11 which is matched with the induction table 10 to induce the extension of the pull rod 5, wherein the sensor 11 is preferably, but not limited to, an inductive sensor, such as model BD 1-S3-P3; and a proximity switch 12 (with an unlimited model) for sensing that a center rod of the piston 140 (particularly, the foremost sub-piston 141) extends out to generate an automatic tool changing signal is further installed in the front end of the rear connecting cover 3, and when the piston 140 (particularly, the foremost sub-piston 141) moves in a telescopic way to trigger the proximity switch 12, the proximity switch 12 generates an automatic tool changing signal.

In this embodiment, the electric spindle further includes an inner nut 13, a front nut 14, a balance nut 15, an oil blocking cover 16, an air sealing ring 17 and a front sealing cover 18, the front periphery of the mandrel 2 is installed in the front end of the housing 1 through front bearings 19 (specifically, two front bearings 19 are provided with a front spacer ring therebetween), the inner nut 13 is fixedly installed in the front end of the housing 1 and abuts against the outer ring front end surface of the front bearings 19, the front nut 14 is fixedly installed in the front of the mandrel 2 and abuts against the inner ring front end surface of the front bearings 19, the balance nut 15 is fixedly installed on the front of the mandrel 2 and abuts against the front end surface of the front nut 14, the oil blocking cover 16 is fixedly installed at the front end outer edge of the housing 1, the air sealing ring 17 is fixedly installed at the front end inner edge of the housing 1, the front sealing cover 18 is fixedly installed at the front side of the air sealing ring 17, and the front nut 14 is respectively connected with the inner nut 13, the front, The air seal ring 17 is in clearance fit, and the balance nut 15 is in clearance fit with the air seal ring 17. The balance nut 15 and the front nut 14, the gas seal ring 17 and the inner nut 13 form a circuitous blocking structure, so that impurities such as dust and cooling water can be effectively prevented from entering the shell 1, and the service life of the electric spindle is prolonged.

In this embodiment, an axial air passage 20 is formed in the side wall of the housing 1, the axial air passage 20 penetrates through the front end surface and the rear end surface of the cylindrical housing 1, a transition air passage 21 communicated with the axial air passage 20 is formed in the oil blocking cover 16, a radial air passage 22 communicated with the transition air passage 21 is formed in the air sealing ring 17, an air outlet of the radial air passage 22 is formed in the front end surface of the air sealing ring 17 and faces the rear side surface of the front sealing cover 18, impurities such as dust, cooling water and the like can be well prevented from entering the inner cavity of the housing 1 through an air sealing structure, and the service life of the electric spindle is prolonged.

In this embodiment, the fixed cover in middle part periphery of dabber 2 is equipped with rotor 23 (like the copper rotor), both ends all are provided with short circuit ring 25 around rotor 23, the fixed stator 24 who is equipped with rotor 23 matched with of middle part in the casing 1 that inlays, stator 24 surrounds outside rotor 23, stator 24 includes the coil, rotor 23 and stator 24 have constituteed the motor.

In this embodiment, the electric spindle further includes a bearing seat 26, a steel ball retainer 27, a balance ring 28, a rear nut 29, a balance gland 30, a spring seat 31 and a middle seal cover 32, the outer periphery of the bearing seat 26 is slidably mounted in the housing 1 through the steel ball retainer 27, and the bearing seat 26 can slide back and forth relative to the housing 1 through the steel ball retainer 27; the rear portion periphery of dabber 2 passes through rear bearing 33 (specifically two, is provided with back spacer ring between two rear bearing 33) and installs in bearing frame 26, balanced ring 28 cover is established at the rear portion of dabber 2 and is withstood the preceding terminal surface of inner circle of rear bearing 33, back nut 29 fixed mounting is at the rear portion of dabber 2 and withstands the inner circle rear end face of rear bearing 33, balanced gland 30 fixed cover is established at the rear end of dabber 2, spring holder 31 is installed in casing 1 and is fixed a position its front side by the step in the casing 1, a plurality of evenly distributed's second spring locating hole 34 has been seted up to the preceding terminal surface of bearing frame 26, install the second spring 35 that withstood spring holder 31 rear side forward in the second spring locating hole 34, well sealed lid 32 fixed mounting is on the rear end face of bearing frame 26 and covers rear bearing 33 and back nut 29.

The working principle of the embodiment is as follows: before tool changing, only compressed air with preset air pressure is sent from a tool release air inlet hole 131 of the air cylinder 100, the compressed air sequentially enters the sub cylinder bodies 122 and 121 from back to front and sequentially pushes the sub pistons 144, 143, 142 and 141 to move forwards from back to front, the next sub piston 144, 143 and 142 props against the previous sub piston 143, 142 and 141, so that the foremost sub piston 141 is instantaneously exploded to generate strong propelling force, the central rod of the foremost sub piston 141 collides against the pull rod 5, the HSK pull claw is extended forwards, and the original tool is released to fall off; when the tool is changed, the HSK pull claw automatically grabs a new tool by using an external manipulator, then compressed air with preset air pressure is sent in only from the pull tool air inlet 7 on the rear connecting cover 3, the compressed air enters the foremost sub-cylinder 121 through the pull tool air inlet 111 on the inner sleeve body 110, the plurality of sub-pistons 141, 142, 143 and 144 are sequentially pushed from front to back to move backwards and return, so that the foremost sub-piston 141 returns, the pull rod 5 retracts backwards under the action of the belleville spring 6, so that the HSK pull claw retracts backwards, and the new tool is clamped and fixed, and the effect of quickly changing the tool is achieved. Because the first spring 150 is additionally arranged, the distance between the pull rod 5 and the piston 140 (particularly the foremost sub-piston 141) can be effectively increased under the condition of sudden power failure or insufficient air supply pressure in the tool changing process, so that high-speed friction cannot be generated, a protection effect is achieved, and the service life of the electric spindle is prolonged.

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 pneumatic automatic tool changing hypervelocity electricity main shaft which characterized in that: the core shaft is rotatably arranged in the shell, an axial through hole is formed in the center of the core shaft, a pull rod penetrates through the axial through hole in a sliding mode, a disc spring enabling the pull rod to reset backwards is arranged in the rear portion of the axial through hole, an HSK pull claw is arranged at the front end of the pull rod, the rear connecting cover is fixedly arranged at the rear end of the shell, and a broach air inlet hole is formed in the rear connecting cover; the cylinder includes the inner casing body, cylinder body, the sealed lid of back and piston, cylinder body fixed mounting is in the rear end of back connection lid, the rear end of the inner casing body is installed in the front end of cylinder body, the inner casing body front end is worn to locate in the rear end of back connection lid, set up the broach intake duct in leading to the cylinder body in the inner casing body, the broach intake duct is linked together with the broach inlet port, piston slidable mounting is in the middle part of cylinder body, well core rod of piston passes the inner casing body and is located the pull rod behind, a plurality of evenly distributed's first spring locating hole has been seted up to the rear end face of the inner casing body, install the first spring that withstands the piston backward in the first spring locating hole, the sealed rear end of installing in the cylinder body of back, the knife loosening inlet port has been seted up on the sealed lid.

2. The pneumatic automatic tool changing ultra-high speed motorized spindle according to claim 1, wherein: the rear connecting cover is further provided with a main shaft center air inlet hole, a first main shaft center air inlet channel communicated with the main shaft center air inlet hole is further formed in the inner sleeve body, an air outlet of the first main shaft center air inlet channel is located on the inner side wall of a center through hole of the inner sleeve body, a second main shaft center air inlet channel is formed in a center rod of the piston, an air outlet of the second main shaft center air inlet channel is located on the front end face of the center rod of the piston, and an annular air inlet of the second main shaft center air inlet channel is aligned with an air outlet of the first main shaft center air inlet channel when the center rod.

3. The pneumatic automatic tool changing ultra-high speed electric spindle according to claim 1 or 2, characterized in that: the cylinder body includes a plurality of series connection's of proper order sub-cylinder body, interior cover body installs in the front end of the sub-cylinder body of foremost, the sealed rear end of installing in the sub-cylinder body of rearmost, the cylinder body has the slip chamber that distributes in proper order around a plurality of, the piston includes a plurality of sub-pistons, sub-piston slidable mounting is in the slip intracavity that corresponds, and the well core rod of foremost sub-piston passes the interior cover body and is located the pull rod directly behind, and well core rod of all the other sub-pistons all stretches into adjacent preceding slip intracavity, and the air vent of two adjacent slip chambeies of intercommunication is all seted up at the center of all the other sub-pistons, the gas outlet and the foremost slip chamber of broach intake duct are linked together, the pine sword intake port is linked together with.

4. The pneumatic automatic tool changing ultra-high speed electric spindle according to claim 1 or 2, characterized in that: the cylinder still includes the back lid, the back sealed lid is installed in the rear end of cylinder body and is fixed its rear side by the jump ring, the back lid is detained and is established in the rear end of cylinder body, the back lid is through a plurality of evenly distributed's screw and back sealed lid fixed connection.

5. The pneumatic automatic tool changing ultra-high speed motorized spindle according to claim 1, wherein: the rear end periphery of pull rod is provided with the response platform, install in the front end of back connection lid and cooperate with the sensor that the response pull rod stretches out with the response platform, still install in the front end of back connection lid and be used for responding to cylinder piston well core rod and stretch out in order to produce the proximity switch of automatic tool changing signal.

6. The pneumatic automatic tool changing ultra-high speed motorized spindle according to claim 1, wherein: still include interior nut, front nut, balanced nut, oil baffle lid, atmoseal ring and preceding sealed lid, the anterior periphery of dabber is installed in the front end of casing through the front bearing, interior nut fixed mounting is in the front end of casing and withstands the terminal surface before the outer lane of front bearing, front nut fixed mounting is in the anterior of dabber and withstands the inner circle front end face of front bearing, balanced nut fixed mounting is on the anterior of dabber and withstands the front nut front end face, oil baffle lid fixed mounting is in the front end outer fringe of casing, atmoseal ring fixed mounting is at the front end inner margin department of casing, preceding sealed lid fixed mounting is in the front side of atmoseal ring, front nut respectively with interior nut, atmoseal ring clearance fit, balanced nut and atmoseal ring clearance fit.

7. The pneumatic automatic tool changing ultra-high speed motorized spindle according to claim 1, wherein: the fixed cover of middle part periphery of dabber is equipped with the rotor, both ends all are provided with the short circuit ring around the rotor, the fixed stator that is equipped with rotor matched with of middle part in the casing is inlayed.

8. The pneumatic automatic tool changing ultra-high speed motorized spindle according to claim 1, wherein: also comprises a bearing seat, a steel ball retainer, a balance ring, a back nut, a balance gland, a spring seat and a middle sealing cover, the periphery of the bearing seat is arranged in the shell in a sliding way through a steel ball retainer, the periphery of the rear part of the mandrel is arranged in the bearing seat through a rear bearing, the balance ring is sleeved at the rear part of the mandrel and props against the front end face of the inner ring of the rear bearing, the rear nut is fixedly arranged at the rear part of the mandrel and props against the rear end face of the inner ring of the rear bearing, the balance gland is fixedly sleeved at the rear end of the mandrel, the spring seat is arranged in the shell and positioned at the front side by a step in the shell, a plurality of second spring positioning holes which are uniformly distributed are formed in the front end surface of the bearing seat, a second spring which is forwards propped against the rear side of the spring seat is arranged in each second spring positioning hole, the middle sealing cover is fixedly arranged on the rear end face of the bearing seat and covers the rear bearing and the rear nut.