CN211889026U

CN211889026U - High-speed closed-loop control center goes out water electricity main shaft

Info

Publication number: CN211889026U
Application number: CN202020396495.5U
Authority: CN
Inventors: 朱旭斌; 翟海华; 倪淋秋; 翟会兴
Original assignee: Jiangsu Huadiao Machinery Co ltd
Current assignee: Jiangsu Huadiao Machinery Co ltd
Priority date: 2020-03-25
Filing date: 2020-03-25
Publication date: 2020-11-10
Anticipated expiration: 2030-03-25

Abstract

The utility model discloses a high-speed closed-loop control center water outlet electric spindle, which comprises a casing, wherein a stator is arranged on the inner wall of the casing, a rotating shaft is coaxially connected in the casing through a pair of bearing assemblies, and a rotor matched with the stator is arranged on the outer wall of the rotating shaft; the left end of the machine shell is coaxially connected with an end cover, the end cover is coaxially connected with a front cover, the front cover is connected with a dust cover, the front cover is provided with a groove, a sealing ring is arranged in the groove, and a plurality of V-shaped grooves are formed in the outer side surface of the sealing ring; the pair of bearing assemblies comprises a front bearing assembly and a rear bearing assembly, the left end of the rotating shaft is connected with the end cover through the front bearing assembly, and the right end of the rotating shaft is connected with the shell through the rear bearing assembly; the front bearing assembly is arranged at the left end of the rotating shaft in an interference fit mode and locked through a sealing cover, and the sealing cover is connected with the rotating shaft. The electric main shaft adopts compressed air to perform air curtain sealing and labyrinth sealing combination, thereby achieving better sealing effect. The electric spindle can be widely applied to deep hole, tapping and high-speed milling of various materials.

Description

High-speed closed-loop control center goes out water electricity main shaft

Technical Field

The utility model belongs to the technical field of electromechanical engineering, concretely relates to high-speed closed-loop control center goes out water electricity main shaft.

Background

At present, with the continuous development and the gradual improvement of the electric spindle technology, the electric spindle is selected by more and more industries. However, the electric spindle is easy to feed dust and liquid in the using process and the service life of the electric spindle is influenced, so that the using cost of the electric spindle is increased. And when the electric spindle is used in the deep hole machining and cutting process, a large amount of heat can be generated, and the service performance of the cutter and the machining quality of the surface of a workpiece can be influenced. The cutter and the workpiece cannot be cooled well, and the durability of the cutter and the machining precision of the workpiece can be reduced, so that the electric spindle with long service life and high machining quality is urgently needed in the market.

Disclosure of Invention

The utility model provides a high-speed closed-loop control center goes out water electricity main shaft has solved the above-mentioned technical problem who adds the electric main shaft into dirt feed liquor man-hour.

In order to solve the technical problem, the utility model discloses the technical scheme who adopts is: a high-speed closed-loop control center water outlet electric spindle comprises a machine shell, wherein a stator is arranged on the inner wall of the machine shell, a rotating shaft is coaxially connected in the machine shell through a pair of bearing assemblies, and a rotor matched with the stator is arranged on the outer wall of the rotating shaft; the left end of the shell is coaxially connected with an end cover, the end cover is coaxially connected with a front cover, the front cover is connected with a dust cover, the front cover is provided with a groove, a sealing ring is arranged in the groove, and a plurality of V-shaped grooves are formed in the outer side surface of the sealing ring; the pair of bearing assemblies comprises a front bearing assembly and a rear bearing assembly, the left end of the rotating shaft is connected with the end cover through the front bearing assembly, and the right end of the rotating shaft is connected with the shell through the rear bearing assembly; the front bearing assembly is arranged at the left end of the rotating shaft in an interference fit mode and locked through a sealing cover, and the sealing cover is connected with the rotating shaft.

Furthermore, a pulling claw, a push rod and a disc spring are arranged in the rotating shaft, one end of the pulling claw is connected with a cutter, the other end of the pulling claw is connected with the push rod, the disc spring is coaxially installed on the push rod, and a cutter cooling water channel is arranged in the push rod.

Further, the cutter cooling water channel is connected with a water inlet of the central water inlet mechanism, the pull claw is connected with the cutter through the cutter handle, and an internal water channel communicated with the cutter cooling water channel is arranged in the cutter handle. The cooling device has the effects of cooling the cutter and the machined part, reducing the cutting temperature, reducing the thermal deformation of the workpiece and the cutter, and being beneficial to improving the machining precision and the finish degree and prolonging the service life of the cutter.

Furthermore, a connecting body is arranged on the right end face of the shell, the connecting body and the shell are coaxially mounted, and the connecting body is sequentially connected with a front cylinder, a middle cylinder and a rear cylinder from left to right; the pistons of the front cylinder, the middle cylinder and the rear cylinder are respectively a front piston, a middle piston and a rear piston, the front piston is slidably mounted between the front cylinder and the connecting body, the middle piston is slidably mounted between the middle cylinder and the front cylinder, and the rear piston is slidably mounted between the rear cylinder and the middle cylinder; the output end of the rear piston is connected with the middle piston, the output end of the middle piston is connected with the front piston, and the output end of the front piston is connected with the push rod. The design of 3 groups of cylinders is adopted, so that the main shaft can be normally exchanged when the air pressure is 0.5MPa, and the air pressure requirement on an air source of an air path is reduced.

Further, a sliding sleeve is coaxially installed in the rear cylinder, and the left end of the sliding sleeve is connected with the front piston; the right end of the rear cylinder is coaxially provided with a rear cover, and the rear cover is in contact with the right end of the sliding sleeve.

Further, the back bearing assembly with the right-hand member interference fit of rotation axis is connected and through the installation of lock through the nut locking, the lock through the nut with still be equipped with spacer and encoder gear between the back bearing assembly.

Further, a sensor mounting seat is arranged on the inner side wall of the connecting body, and a sensor is connected to the sensor mounting seat.

Furthermore, air curtain channels which are sequentially communicated are arranged in the front cover, the end cover, the shell, the connecting body, the front air cylinder, the middle air cylinder and the rear air cylinder; and the port of the air curtain channel in the front cover is connected with the air curtain nozzle.

Furthermore, a first annular groove, a first spiral groove, a second spiral groove and a second annular groove are arranged on the outer side surface of the machine shell, the starting points of the first spiral groove and the second spiral groove are arranged according to 180 degrees, the first spiral groove and the second spiral groove are communicated with the first annular groove, and the first spiral groove and the second spiral groove are also communicated with the second annular groove; and a fourth water inlet channel and a fourth water discharge channel are also arranged on the shell, the fourth water inlet channel is communicated with the first spiral groove, and the fourth water discharge channel is communicated with the second spiral groove. The double-helix cooling channel of the electric spindle is formed, and the cooling effect is improved.

Furthermore, the shell is connected to the machine shell in an interference fit mode, and the rotor is a squirrel-cage cast copper rotor. The copper rotor plays the roles of reducing the loss of the rotor, improving the strength of the rotor, improving the overall efficiency of the motor and reducing the temperature rise of the rotor.

The utility model discloses the beneficial effect who reaches: the sealing cover, the dust cover, the sealing ring and the front cover are assembled to form an air curtain air storage cavity, and a clearance labyrinth structure is formed among the front cover, the sealing cover and the sealing ring. Compressed air flows to the air curtain gas storage cavity along a plurality of V-shaped grooves which are all arranged on the sealing ring after being sprayed out from the air curtain nozzle through the air curtain channel, and the compressed air in the air curtain gas storage cavity can be sprayed out from an air curtain annular outlet (namely a gap between the sealing cover and the dust cover) after reaching a certain force storage degree, so that the effect of effectively preventing dust and liquid entering of the electric spindle is achieved.

Drawings

FIG. 1 is a cross-sectional view of the mechanism of the present invention;

FIG. 2 is a view of the present invention from the direction A;

FIG. 3 is a cross-sectional view of the air curtain passage of the present invention;

FIG. 4 is a cross-sectional view of the air inlet and return path of the present invention

Fig. 5 is a schematic view of the first view angle of the housing of the present invention;

fig. 6 is a second view angle outline diagram of the housing of the present invention;

FIG. 7 is a cross-sectional view of the channel of the outgoing line of the power supply and encoder of the present invention;

fig. 8 is a schematic structural view of the sealing ring of the present invention;

fig. 9 is the enlarged schematic view of the air curtain air storage cavity of the present invention.

In the figure: 1-sealing cover; 2-a dust cover; 3-a sealing ring; 4-front cover; 5-end cover; 6-front spacer assembly; 7-a housing; 8-a housing; 9-a rotating shaft; 10-a stator; 11-a rotor; 12-a push rod; 13-spring seats; 14-a first pre-tensioned spring; 15-a bearing cap; 16-a rear spacer assembly; 17-spacer bush; 18-an encoder gear; 19-a lock nut; 20-a sensor mount; 21-a linker; 22-a preceding cylinder; 23-front piston; 24-middle cylinder; 25-a middle piston; 26-a rear cylinder; 27-rear piston; 28-rear cover; 29-mounting a sleeve; 30-water pipe connection; 31-a pre-tightening seat; 32-a second pre-tightening spring; 33-a first contact pad; 34-a second contact pad; 35-pressing a cap; 36-bearing shaft cap; 37-an inner spacer assembly; 38-an inner bearing assembly; 39-a positioning ring; 40-an axial core; 41-a sliding sleeve; 42-a sensor; 43-a rear bearing assembly; 44-disc spring; 45-pulling the claw; 46-a front bearing assembly; 47-a knife handle; 48-clamping plate; 49-encoder readhead; a 50-O-shaped ring; 021-gas curtain gas storage chamber; 041-ring groove; 072 — first annular groove; 073-first helical groove; 074-second annular groove; 077-second helical groove; 401-tool cooling water channel; 277-water inlet of the central water inlet mechanism; 371-internal waterway channels; 276-an air inlet; 279-air return port; 287-a return air channel; 247-a first return air channel; 227-a second return air channel; 272-air curtain inlet; 281-seventh air curtain channel; 241-a first air curtain passage; 221-a second air curtain channel; 211-third air curtain channel; 275-encoder line interface; 285-encoder line outgoing channel; 245-a first encoder line exit channel; 225-second encoder line exit channel; 215-third encoder line outgoing channel; 271-power line interface; 284-power line outlet channel; 244-first power line exit channel; 224-a second power line exit channel; 214-a third power line outlet channel; 078-fourth power line outlet channel; 274-position switch interface; 273-water inlet; 075-fourth water inlet channel; 278-a water discharge port; 283-a drainage channel; 243-first drain channel; 223-a second drainage channel; 213-third drainage channel; 076-fourth drainage channel; 071-fourth air curtain channel; 051-fifth air curtain channel; 043-sixth curtain gas passage; 042-air curtain nozzle.

Detailed Description

The present invention will be further described with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, a high-speed closed-loop control center water outlet electric spindle comprises a machine shell 7, wherein a stator 10 is arranged on the inner wall of the machine shell 7 in an interference manner, a rotating shaft 9 is coaxially connected in the machine shell 7 through a pair of bearing assemblies, a rotor 11 is arranged on the outer wall of the rotating shaft 9 in a coaxial interference manner, and the rotor 11 is matched with the stator 10 to enable the rotating shaft 9 to rotate. The left end of the machine shell 7 is coaxially connected with the end cover 5, and the machine shell 7 is connected with the end cover 5 through screws. The end cover 5 is coaxially connected with the front cover 4, and the end cover 5 is connected with the front cover 4 through screws. The dust cover 2 is connected to the front cover 4, and the dust cover 2 is connected with the front cover 4 through screws. The front cover 4 body is provided with a groove, and the sealing ring 3 is coaxially assembled in the groove in an interference manner. As shown in fig. 8, the outer side surfaces of the seal rings 3 are each provided with a plurality of V-shaped grooves. An annular groove is formed in the groove of the front cover. In this embodiment, the pair of bearing assemblies includes a front bearing assembly 46 and a rear bearing assembly 13, the left end of the rotary shaft 9 is connected to the end cover 5 through the front bearing assembly 46, and the right end of the rotary shaft 9 is connected to the housing 7 through the rear bearing assembly 42. The front bearing assembly 46 is arranged at the left end of the rotating shaft 9 in an interference fit mode, the sealing cover 1 is further coaxially arranged at the left end of the rotating shaft 9, the sealing cover 1 is in contact with the front bearing assembly 46, and the front bearing assembly 46 is arranged at the left end of the rotating shaft 9 in an interference fit mode and is locked through the sealing cover 1. As shown in fig. 9, the front cover 4, the sealing cover 1, the dust cover 2, and the sealing ring 3 are assembled to form an air curtain air storage cavity 021, the sealing cover 1 and the dust cover 2 form an air curtain annular outlet, and a gap labyrinth structure is formed among the front cover 4, the sealing cover 1, and the sealing ring 3.

In this embodiment, the rotor 11 is a squirrel-cage cast copper rotor, and compared with the conventional cast aluminum rotor, the cast copper rotor has smaller rotor loss and higher rotor strength, so that the overall efficiency of the motor is improved, and the temperature rise of the rotor is reduced. And a power supply leading-out wire of the stator 10 is connected into a machine tool driving system.

The spring seat 13 is arranged at the right end of the machine shell 7, the first pre-tightening spring 14 is arranged in a fixing hole in the spring seat 13, pre-tightening force is provided for the front bearing assembly and the rear bearing assembly through the first pre-tightening spring 14, so that the axial rigidity and the radial rigidity of the bearing system are increased, the rear spacing ring assembly 16 is arranged between the rear bearing assemblies 43, the rear bearing assemblies 43 are provided with bearing covers, and the bearing covers are located between the rear bearing assemblies 43 and the spring seat 13. Between the front bearing assemblies 46 is mounted the front cage assembly 6.

A pulling claw 45, a push rod 12 and a disc spring 44 are arranged in the rotating shaft 9, one end of the pulling claw 45 is connected with a cutter, the other end of the pulling claw 45 is connected with the push rod 12, the disc spring 44 is coaxially arranged on the push rod 12, a cutter cooling water channel 401 is arranged in the push rod 12, and the cutter cooling water channel 401 is connected with a water inlet 277 of the central water inlet mechanism. The pulling claw 45 is connected with the cutter through the cutter handle 47, and an internal water channel 371 communicated with the cutter cooling water channel 401 is arranged in the cutter handle 47. In this embodiment, the pull claw 45 is internally provided with M10 × 1 internal threads, the front end of the push rod 12 is provided with M10 × 1 external threads, and the rear end of the push rod 12 is provided with an octagonal joint. The pulling claw 45 is in threaded connection with the push rod 12 by M10 x 1. The pull claw 45, the push rod 12 and the disc spring 44 are assembled to form a knife handle locking mechanism, and the locking mechanism is used for locking the knife handle 47 and the rotating shaft 9 through pulling force formed by prepressing of the disc spring 44 inside the locking mechanism.

The right end face of the machine shell 7 is provided with a connecting body 21, the connecting body 21 and the machine shell 7 are coaxially installed, the connecting body 21 is sequentially connected with a front cylinder 22, a middle cylinder 24 and a rear cylinder 26 from left to right, and the rear cylinder 26, the middle cylinder 24, the front cylinder 22 and the connecting body 21 are connected through screws. The pistons of the front cylinder 22, the middle cylinder 24 and the rear cylinder 26 are respectively a front piston 23, a middle piston 25 and a rear piston 27, the front piston 23 is slidably mounted between the front cylinder 22 and the connecting body 21, the middle piston 25 is slidably mounted between the middle cylinder 24 and the front cylinder 22, and the rear piston 27 is slidably mounted between the rear cylinder 26 and the middle cylinder 24. The output end of the rear piston 27 is connected with the middle piston 25, the output end of the middle piston 25 is connected with the front piston 23, and the output end of the front piston 23 is connected with the push rod 12. The design of 3 groups of cylinders is adopted, so that the main shaft can be normally exchanged when the air pressure is 0.5MPa, and the air pressure requirement on an air source of an air path is reduced.

A sliding sleeve 41 is coaxially arranged in the rear cylinder 26, and the left end of the sliding sleeve 41 is connected with the front piston 23; the right end of the rear cylinder 26 is coaxially installed with a rear cover 28, the rear cover 28 is in contact with the right end of the sliding sleeve 41, and the rear cover 28 is used for pressing the sliding sleeve 41. The rear bearing assembly 43 is connected with the right end of the rotating shaft 9 in an interference fit mode and is installed in a locking mode through a nut 19 through a lock, and a spacer 17 and an encoder gear 18 are further arranged between the lock and the rear bearing assembly 43 through the nut 19. The casing 7 is also provided with an encoder reading head 49, the encoder reading head 49 and the encoder gear 18 form a detection device for detecting the rotation position and the speed, and the real-time operation data of the main shaft is fed back to a machine tool system, so that the control of the machine tool and the trimming of cutting parameters are facilitated.

As shown in fig. 4, the sliding sleeve 41 and the front piston 23 are sealed by an O-ring 50. The front cylinder and the connecting body are sealed by adopting an O-shaped ring 50, a first air inlet cavity is formed among the front piston 23, the front cylinder 22 and the sliding sleeve 41, the front piston 23 and the front cylinder 22 are sealed by adopting the O-shaped ring 50, and a first air return cavity is formed between the connecting body 21 and the front piston 23 and is sealed by adopting the O-shaped ring 50. The middle cylinder 24 and the front cylinder 22 are sealed by adopting an O-shaped ring 50, a second air inlet cavity is formed among the middle piston 25, the middle cylinder 24 and the sliding sleeve 41 and is sealed by adopting the O-shaped ring 50, and a second air return cavity is formed between the middle piston 25 and the front cylinder 22 and is sealed by adopting the O-shaped ring 50. The rear cylinder 26 and the middle cylinder 24 are sealed by adopting O-shaped rings, a third air inlet cavity is formed among the rear cylinder 26, the rear piston 27 and the sliding sleeve 41 and is sealed by adopting the O-shaped rings 50, and a third air return cavity is formed between the rear piston 27 and the middle cylinder 24 and is sealed by adopting the O-shaped rings 50. And an O-shaped ring is used for sealing between the rear cylinder 26 and the sliding sleeve 41.

When the tool is in operation, 0.5-0.7MPa of compressed air enters the first air inlet cavity, the second air inlet cavity and the third air inlet cavity from the air inlet 276 at the same time, the three groups of pistons are pushed to move forwards at the same time, the pistons push the push rod 12 to compress the disc springs 44 in the pistons, the push rod 12 drives the pull claws 45 to move forwards and open automatically at the same time, and at the moment, the spindle is in a tool unloading state and can be taken down or put on the tool shank 47. When air is fed, the air in each air return pipeline and the air return cavity is synchronously discharged. After the tool unloading state is completed, the tool changing mechanism performs resetting action. Compressed air simultaneously enters the first air return cavity, the second air return cavity and the third air return cavity from the air return opening 279, the piston is pushed to move backwards, the disc spring 44 resets simultaneously, the push rod 12 drives the pull claw 45 to move backwards to lock the tool shank 47 through the pretightening force of the disc spring 44, and at the moment, the main shaft is in a broach state. And when the air returns, the air in each air inlet pipeline and the air inlet cavity is synchronously discharged.

The connecting body 21, the front cylinder 22, the front piston 23, the middle cylinder 24, the middle piston 25, the rear cylinder 26, the rear piston 27, the rear cover 28 and the sliding sleeve 41 form a tool changing mechanism. As shown in fig. 2 and 3, the rear cylinder 26 is provided with an air inlet 276, an air return port 279, an air return channel 287, an air curtain air inlet 272, a seventh air curtain channel 281, a power line interface 271, a power line leading-out channel 284, an encoder line interface 275, an encoder line leading-out channel 285, a position switch interface 274, a position switch line leading-out channel, a water inlet 273, a water inlet passage, a water outlet 278 and a water outlet 283. The middle cylinder is provided with a first air return channel 247, a first air curtain channel 241, a first power line leading-out channel 244, a first encoder line leading-out channel 245, a first position switch line leading-out channel, a first water inlet channel and a first water discharging channel 243. The front cylinder is provided with a second air return channel 227, a second air curtain channel 221, a second power line leading-out channel 224, a second encoder line leading-out channel 225, a second position switch line leading-out channel, a second water inlet channel and a second water drainage channel 223. The connector is provided with a third air curtain channel 211, a third power line leading-out channel 214, a third encoder line leading-out channel 215, a third position switch leading-out channel 216, a third water inlet channel and a third water discharge channel 213. A fourth power line outlet channel 078, a fourth water inlet channel 075 and a fourth water discharge channel 076 are further arranged on the machine shell.

The air return port 279, the air return channel 287, the first air return channel 247, and the second air return channel 227 are connected in this order. The air curtain air inlet 272, the seventh air curtain channel 281, the first air curtain channel 241, the second air curtain channel 221 and the third air curtain channel 211 are communicated in sequence. As shown in fig. 7, the encoder wire interface 275, the encoder wire lead-out channel 285, the first encoder wire lead-out channel 245, and the second encoder wire lead-out channel 225 are sequentially connected, and the spindle encoder wire is led out to the outside of the spindle through the channels and used for connection with a machine tool control system. The power line interface 271, the power line leading-out channel 284, the first power line leading-out channel 244, the second power line leading-out channel 224, the third power line leading-out channel 214 and the fourth power line leading-out channel 078 are sequentially communicated, and a spindle power line is led out of the spindle through the channels and is used for being connected with a machine tool control system. The position switch interface 274, the position switch wire leading-out channel, the first position switch wire leading-out channel and the second position switch wire leading-out channel are sequentially connected, and the spindle position switch wire is led out to the outside of the spindle through the channels and is used for being connected with a machine tool control system. The water inlet 273, the water inlet channel, the first water inlet channel, the second water inlet channel, the third water inlet channel and the fourth water inlet channel 075 are communicated in sequence. The drain port 278, the drain passage 283, the first drain passage 243, the second drain passage 223, the third drain passage 213, and the fourth drain passage 076 are connected in this order.

The central water inlet mechanism is coaxially mounted at the right end of the rear cover 28 by a clamping plate 48. The central water inlet mechanism comprises a mounting sleeve 29, a water pipe joint 30, a pre-tightening seat 31, a second pre-tightening spring 32, a first contact piece 33, a second contact piece 34, a pressing cap 35, a bearing shaft cover 36, an inner spacer assembly 37, an inner bearing assembly 38, a positioning ring 39 and a shaft core 40. The installation sleeve 29 is installed in the rear cover 28, the installation sleeve 29 and the rear cover 28 are fixed in a limiting mode through the clamping plate 48, the water pipe joint 30 is installed on the installation sleeve 29, the pre-tightening seat 31 is installed in the installation sleeve 29 in a sliding fit mode, the guide pin and the second pre-tightening spring 32 are installed between the pre-tightening seat 31 and the installation sleeve 29, the pre-tightening seat 31 is further provided with the first contact piece 33 in an interference fit mode, the second contact piece 34 and the shaft core 40 are installed in a coaxial interference fit mode, and the inner bearing assembly 38 and the bearing shaft cover 36 are fixedly installed inside the installation sleeve 29 through the positioning ring 39. An inner spacer assembly 37 is arranged between the inner bearing assemblies 38, and the shaft core 40 and the inner bearing assemblies 38 are coaxially arranged in an interference fit mode and are locked through the pressing cap 35.

The push rod 12 is internally provided with a cutter cooling water channel 401, and an octagonal joint at the rear end of the push rod 12 is inserted into the central water inlet mechanism shaft core 40. When the water-saving device works, the push rod 12 and the rotating shaft 9 rotate at a high speed, and the central water inlet mechanism is driven by the octagonal joint on the push rod 12 to rotate at a high speed. When the tool cooling water spraying device works, the tool cooling water enters from a water inlet 277 on the central water inlet mechanism, passes through a water channel inside the central water inlet mechanism and a water channel 371 inside the push rod 12, and then is sprayed out of a cooling water outlet on the tool shank 47 to the tool. The water inlet 277 on the central water inlet mechanism, the water path inside the central water inlet mechanism, the cutter cooling water channel 401 and the cooling water outlet on the cutter handle 47 form a central water outlet structure, which is used for cooling the cutter and the machined part, reducing the cutting temperature, reducing the thermal deformation of the workpiece and the cutter, being beneficial to improving the machining precision and the finish and prolonging the service life of the cutter. The cutter cooling water pressure is 0.5-7 MPa.

As shown in fig. 5 to 6, a first annular groove 072, a first spiral groove 073, a second spiral groove 077 and a second annular groove 074 are arranged on the outer side surface of the casing 7, starting points of the first spiral groove 073 and the second spiral groove 077 are arranged at 180 degrees, the first spiral groove 073 and the second spiral groove 077 are communicated with the first annular groove 072, and the first spiral groove 073 and the second spiral groove 077 are also communicated with the second annular groove 074. A fourth power line leading-out channel 078, a fourth water inlet channel 075 and a fourth water discharging channel 076 are further arranged on the machine shell 7, the fourth water inlet channel 075 is communicated with the first spiral groove 073, and the fourth water discharging channel 076 is communicated with the second spiral groove 077. The shell 8 is connected to the machine shell 7 in an interference fit mode, and after the shell 8 and the machine shell 7 are assembled, the first spiral groove 073, the second spiral groove 077, the first annular groove 072, the second annular groove 074, the fourth water inlet channel 075 and the fourth water discharge channel 076 jointly form a main shaft double-spiral cooling channel.

During operation, cooling water enters from the water inlet 273, passes through the water inlet channel, the first water inlet channel, the second water inlet channel, the third water inlet channel, the spindle double-helix cooling channel, the third water discharge channel 213, the second water discharge channel 223, the first water discharge channel 243 and the water discharge channel 283, and then flows to the water tank from the water discharge port 278, so that a circulating cooling pipeline of the spindle is formed. For cooling the stator 10, the rear bearing assembly 43 and the front bearing assembly 46 mounted inside the casing 7.

The inner side wall of the connecting body 21 is provided with a sensor mounting seat 20, and the sensor mounting seat 20 is connected with a sensor 42. In this embodiment, the sensors 42 are two sets of position sensors, and are connected to a machine tool control system to feed back the tool loading or unloading state of the spindle in real time. When the system detects a tool loading signal, the main shaft can normally run, and when a tool unloading signal or no signal is detected, the system alarms that the main shaft cannot start to work, so that misoperation in the tool changing process is prevented, and safe and stable operation of equipment is ensured.

Air curtain channels which are communicated in sequence are arranged in the front cover 4, the end cover 5, the machine shell 7, the connecting body 21, the front air cylinder 22, the middle air cylinder 24 and the rear air cylinder 26; the port of the air curtain channel in the front cover is connected with the air curtain nozzle. Specifically, the connecting body 21, the front cylinder 22, the middle cylinder 24 and the rear cylinder 26 are respectively provided with a third air curtain passage 211, a second air curtain passage 221, a first air curtain passage 241 and a seventh air curtain passage 281; a sixth air curtain passage 043 is arranged in the front cover 4, and the port of the sixth air curtain passage 043 is connected with an air curtain nozzle 042; a fifth air curtain channel 051 is arranged in the end cover 5; a fourth air curtain passage 071 is provided in the housing 7. The sixth air curtain passage 043, the fifth air curtain passage 051, the fourth air curtain passage 071, the third air curtain passage 211, the second air curtain passage 221, the first air curtain passage 241 and the seventh air curtain passage 281 are communicated in sequence.

The utility model discloses in, sealed lid 1, dust cover 2, sealing ring 3 and protecgulum 4 assembly back form air curtain gas storage cavity 021, form clearance labyrinth structure between protecgulum 4, sealed lid 1, the sealing ring 3. The excircle of the sealing ring is provided with a plurality of V-shaped grooves, an annular groove 041, an air curtain nozzle 042 and a sixth air curtain channel 043 are arranged in the front cover 4, and an annular air curtain is formed after the front cover 4 and the sealing cover 3 are assembled. When the electric spindle works, 0.05-0.1MPa of compressed air enters from the air curtain air inlet 272, is sprayed out from the air curtain nozzle 042 through the air curtain channel and then flows into the air curtain air storage cavity 021 along a plurality of V-shaped grooves which are all arranged on the sealing ring 3, the compressed air in the air curtain air storage cavity 021 can be sprayed out from an air curtain annular outlet (namely a gap opening between the sealing cover 1 and the dust cover 2) after reaching a certain force accumulation degree, the spindle is sealed by adopting a non-contact air curtain, and therefore the effect of effectively preventing dust and liquid from entering the electric spindle is achieved.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be considered as the protection scope of the present invention.

Claims

1. A high-speed closed-loop control center water outlet electric spindle is characterized by comprising a machine shell, wherein a stator is arranged on the inner wall of the machine shell, a rotating shaft is coaxially connected in the machine shell through a pair of bearing assemblies, and a rotor matched with the stator is arranged on the outer wall of the rotating shaft;

the left end of the shell is coaxially connected with an end cover, the end cover is coaxially connected with a front cover, the front cover is connected with a dust cover, the front cover is provided with a groove, a sealing ring is arranged in the groove, and a plurality of V-shaped grooves are formed in the outer side surface of the sealing ring; an annular groove is formed in the groove of the front cover;

the pair of bearing assemblies comprises a front bearing assembly and a rear bearing assembly, the left end of the rotating shaft is connected with the end cover through the front bearing assembly, and the right end of the rotating shaft is connected with the shell through the rear bearing assembly;

the front bearing assembly is arranged at the left end of the rotating shaft in an interference fit mode and locked through a sealing cover, and the sealing cover is connected with the rotating shaft.

2. The high-speed closed-loop control center water outlet electric spindle as claimed in claim 1, wherein a pulling claw, a pushing rod and a disc spring are arranged in the rotating shaft, one end of the pulling claw is connected with a cutter, the other end of the pulling claw is connected with the pushing rod, the disc spring is coaxially mounted on the pushing rod, and a cutter cooling water channel is arranged in the pushing rod.

3. The high-speed closed-loop control center water outlet electric spindle according to claim 2, wherein the cutter cooling water channel is connected with a water inlet of a center water inlet mechanism, the pull claw is connected with the cutter through a cutter handle, and an internal water channel communicated with the cutter cooling water channel is arranged in the cutter handle.

4. The high-speed closed-loop control center water outlet electric spindle according to claim 2, wherein a connector is arranged on a right end face of the housing, the connector is coaxially mounted with the housing, and a front cylinder, a middle cylinder and a rear cylinder are sequentially connected to the connector from left to right;

the pistons of the front cylinder, the middle cylinder and the rear cylinder are respectively a front piston, a middle piston and a rear piston, the front piston is slidably mounted between the front cylinder and the connecting body, the middle piston is slidably mounted between the middle cylinder and the front cylinder, and the rear piston is slidably mounted between the rear cylinder and the middle cylinder;

the output end of the rear piston is connected with the middle piston, the output end of the middle piston is connected with the front piston, and the output end of the front piston is connected with the push rod.

5. The high-speed closed-loop control center water outlet electric spindle of claim 4, wherein a sliding sleeve is coaxially installed in the rear cylinder, and the left end of the sliding sleeve is connected with the front piston; the right end of the rear cylinder is coaxially provided with a rear cover, and the rear cover is in contact with the right end of the sliding sleeve.

6. The high-speed closed-loop control center electric spindle as claimed in claim 1, wherein the rear bearing assembly is connected with the right end of the rotating shaft in an interference fit manner and is locked and installed by a lock via a nut, and a spacer bush and an encoder gear are further arranged between the lock via the nut and the rear bearing assembly.

7. The high-speed closed-loop control center water outlet electric spindle according to claim 4, wherein a sensor mounting seat is arranged on the inner side wall of the connecting body, and a sensor is connected to the sensor mounting seat.

8. The high-speed closed-loop control center water outlet electric spindle of claim 4, wherein air curtain channels which are sequentially communicated are arranged in the front cover, the end cover, the machine shell, the connecting body, the front air cylinder, the middle air cylinder and the rear air cylinder; and the port of the air curtain channel in the front cover is connected with the air curtain nozzle.

9. The high-speed closed-loop control center water outlet electric spindle as claimed in claim 1, wherein a first annular groove, a first spiral groove, a second spiral groove and a second annular groove are arranged on the outer side surface of the housing, the starting points of the first spiral groove and the second spiral groove are arranged at 180 degrees, the first spiral groove and the second spiral groove are communicated with the first annular groove, and the first spiral groove and the second spiral groove are also communicated with the second annular groove; and a fourth water inlet channel and a fourth water discharge channel are also arranged on the shell, the fourth water inlet channel is communicated with the first spiral groove, and the fourth water discharge channel is communicated with the second spiral groove.

10. The high-speed closed-loop control center water outlet electric spindle of claim 1, wherein the housing is connected with a shell in an interference fit manner, and the rotor is a squirrel-cage cast copper rotor.