CN210548158U - Synchronous carving of axle in-core cooling permanent magnetism mills electric main shaft - Google Patents

Abstract

The utility model provides a synchronous carving of axle core cooling permanent magnetism mills electric main shaft, belong to a vertical carving and mill electric main shaft, this electric main shaft includes rotatable main shaft axle core, a liquid reposition of redundant personnel pivot for cooling main shaft axle core, a rear bearing and front bearing for supporting main shaft axle core, a water jacket casing for cooling stator and bearing, a liquid reflux decompression recovery box that is used for the front coupling of air curtain protection and is used for the coolant liquid circulation, this scheme adopts vertical overall arrangement's main shaft mounting structure, motor stator and rotor control by temperature change cooling simultaneously, can be to the stator, the rotor uses same cooler or two coolers, carry out temperature management to each position of generating heat of main shaft, thereby realize axle length direction accuracy management, reach high-accuracy processing. The utility model provides an electricity main shaft is the electricity main shaft of controllable, high accuracy of thermal extension, high reliability, has advantages such as simple structure, job stabilization are reliable.

Description

Synchronous carving of axle in-core cooling permanent magnetism mills electric main shaft

Technical Field

The utility model belongs to a vertical carving mills electric main shaft, especially relates to a synchronous carving of axle core cooling permanent magnetism mills electric main shaft.

Background

At present, the three-dimensional forming surface processing in the precision mold industry is mainly realized in two ways: one is three-dimensional engraving and milling by a CNC machine tool, and then manually polishing the surface; one is to carve and mill the electrode opposite to the forming surface by a CNC machine tool, then to process the forming surface by an electric spark machine tool by the electrode, and then to polish manually.

The two methods both have a CNC engraving and milling link, and the processing quality of the engraving and milling link directly determines the workload of the subsequent manual link. The CNC lathe of current domestic production, because main shaft rotational speed, the hot extension problem of main shaft, the fineness of processing is not enough, and artifical polishing is with long time, and is efficient with low costs.

Some high-precision die parts can be machined even only by using an imported high-precision CNC machine tool, and the cost is huge. The CNC machine tool using the high-precision, high-speed and low-thermal-elongation electric spindle is the key for improving the machining fineness of the forming surface, but the electric spindle products are missing in China, the foreign technology protection is strict, the technology is basically mastered in several die CNC production enterprises in Japan and Europe, and the technical problem of the high-speed and low-thermal-elongation electric spindle is urgently needed to be solved in China because the machine tool enterprises are missing.

SUMMERY OF THE UTILITY MODEL

To the above defect, the utility model discloses a main shaft mounting structure, motor stator and the cooling of rotor control by temperature change simultaneously of vertical overall arrangement can use same cooler or two coolers to stator, rotor, carries out temperature management to each position that generates heat of main shaft to realize the management of axle length direction precision, reach high-accuracy processing. The utility model provides an electricity main shaft is the electricity main shaft of controllable, high accuracy of thermal extension, high reliability, has advantages such as simple structure, job stabilization are reliable. Particularly, the method can effectively control the thermal elongation of the shaft core, and is suitable for three-dimensional processing of the surfaces of precision die parts, die electrodes and other precision parts.

In order to achieve the above object, the embodiments of the present invention adopt the following technical solutions:

the utility model provides a synchronous carving of interior cooling permanent magnetism of axle mills electricity main shaft includes rotatable main shaft axle core, the liquid reposition of redundant personnel pivot that is used for cooling main shaft axle core, a back bearing and the front bearing that is used for supporting main shaft axle core, a water jacket casing that is used for cooling stator and internal bearing, a preceding coupling that is used for air curtain protection, a back coupling that is used for connecting the coolant liquid, a preceding gland and preceding labyrinth nut that are used for installing the front bearing, and a liquid backward flow decompression that is used for the coolant liquid circulation retrieves the box, wherein: a chuck is mounted at one end of the spindle core through a chuck nut and used for mounting a machining tool, and a cooling cavity is arranged in one end of the spindle core; one end of the liquid diversion rotating shaft is installed in the cooling cavity, the other end of the liquid diversion rotating shaft is provided with a rotary joint group, the center of the liquid diversion rotating shaft is provided with a cooling liquid inflow channel in a penetrating mode, a cooling liquid outflow channel is arranged on an installation table of the liquid diversion rotating shaft, one side of the installation table is close to the rear bearing, the other side of the installation table is provided with a liquid diversion cover, the liquid backflow decompression recovery box is buckled on the installation table and the liquid diversion cover through a recovery box cover, and the rotary joint group is provided with an axle center inner cooling inlet; the rear bearing is arranged at the rear end of the spindle shaft core through a rear bearing seat, and the bearing seat is arranged between the water jacket shell and the liquid reflux pressure-reducing recovery box; the front bearing is arranged at the front end of the spindle shaft core through a front bearing seat, the front bearing seat is arranged in the water jacket shell through an external front gland, the front gland is fixedly arranged through a front labyrinth nut, and a front inner spacer ring and a front outer spacer ring are arranged in the front bearing; a first lead hole is formed in the bearing seat, and a second lead hole is formed in the liquid reflux pressure-reducing recovery box; a motor stator cooling inlet and a motor stator cooling outlet are formed in the side face of the water jacket shell; the stator is arranged in the middle of the water jacket shell, and a power supply U line interface, a power supply V line interface and a power supply W line interface for the stator are arranged on the side surface of the liquid reflux pressure-reducing recovery box; the front pipe joint is arranged on the front pressure cover and is connected with high-pressure gas for gas curtain protection; the rear pipe joint is arranged on the liquid reflux pressure-reducing recovery box and is connected with a cavity inside the liquid reflux pressure-reducing recovery box.

Furthermore, a plurality of water cavities are uniformly arranged inside the water jacket shell, and the water cavities are connected with cooling liquid through a motor stator cooling inlet and a motor stator cooling outlet.

Furthermore, one end of the axle center inner cooling inlet is communicated with a cooling liquid inflow channel of the liquid diversion rotating shaft through threads, and the other end of the axle center inner cooling inlet is connected with the cooling liquid.

Further, still include the cooling bath, set up at inside temperature sensor of cooling bath and circulating pump and be used for the cooling device of cooling liquid temperature control, the circulating pump is used for the coolant liquid to circulate between cooling bath and water jacket casing and cooling chamber, temperature sensor gathers the cooling bath temperature in real time and constitutes temperature closed-loop control with cooling device collaborative work.

Further, the cooling device comprises a semiconductor refrigeration device or a compression cooling device.

Further, the number of the circulation pumps is three, wherein: the first circulating pump is installed in the cooling tank and connected with a cooling inlet of a motor stator, the second circulating pump is installed in the cooling tank and connected with a rotary joint group, and the third circulating pump is installed in the cooling tank and connected with a rear pipe joint.

The utility model discloses a synchronous carving of axle in-core cooling permanent magnetism mills electric main shaft has following beneficial effect:

1. the precision stability is high, compared with the current engraving and milling electric spindle, the thermal elongation of the spindle core can be controlled within 3 microns, and the thermal elongation of the current mainstream engraving and milling electric spindle is measured by taking a wire (10 microns) as a unit.

2. Low cost and high performance: compared with the similar foreign engraving and milling electric spindle, the cost and the selling price of the scheme are only one third, and the functions and the performance of the scheme reach the level of Japanese products at the top of the world.

3. The reliability is high: the consistency of the effect of controlling the thermal elongation in the scheme can reach 100 percent, the quality of the processed molded surface of the spindle product is far higher than that of a carving and milling spindle without a spindle core internal cooling technology, and the processing target can be reliably realized. Meanwhile, the good temperature control enables the temperature of the bearing to be lower and stable, the rotation running precision of the main shaft is improved, and the service life of the main shaft is prolonged.

Drawings

FIG. 1 is a schematic view of the internal structure of the present invention;

FIG. 2 is the schematic diagram of the external structure of the present invention

FIG. 3 is a schematic structural view of the rear pipe joint of the present invention;

fig. 4 is a schematic diagram of the power interface of the present invention.

In the figure, 1-spindle shaft core, 2-liquid shunt rotating shaft, 3-rear bearing, 4-front inner partition ring, 5-front outer partition ring, 6-front bearing, 7-first lead hole, 8-water jacket shell, 9-front bearing seat, 10-stator, 11-second lead hole, 12-front pipe joint, 13-rear bearing seat, 14-rear pipe joint, 15-chuck, 16-chuck nut, 17-front gland, 18-front labyrinth nut, 19-liquid guide cover, 20-liquid reflux decompression recovery box, 21-recovery box cover, 22-return joint group, 23-axis inner cooling inlet, 24-motor stator cooling inlet, 25-motor stator cooling outlet, 26-power U line interface, 27-power V line interface, 28-Power W line interface.

Detailed Description

The invention is further explained according to the attached drawings:

3 as 3 shown 3 in 3 fig. 3 1 3, 3 2 3, 3 3 3 and 3 4 3, 3 wherein 3 fig. 3 1 3 is 3 a 3 sectional 3 view 3 taken 3 along 3 a 3- 3 a 3 of 3 fig. 3 2 3, 3 fig. 3 3 3 is 3 a 3 sectional 3 view 3 taken 3 along 3 b 3- 3 b 3 of 3 fig. 3 2 3, 3 and 3 fig. 3 4 3 is 3 an 3 end 3 view 3 of 3 the 3 electric 3 spindle 3. 3 The technical purpose of the utility model is to overcome present carving and milling electric main shaft axle core thermal extension not well controlled, along with the undulant problem of temperature variation main shaft precision. The technical scheme is as follows: the main shaft designed as a built-in rare earth permanent magnet synchronous high-speed motor drive comprises a rotatable main shaft core 1, a liquid diversion rotating shaft 2 for cooling the main shaft core 1, a rear bearing 3 and a front bearing 6 for supporting the main shaft core 1, a water jacket shell 8 for cooling a stator 10 and an internal bearing, a front pipe joint 12 for air curtain protection, a rear pipe joint 14 for connecting cooling liquid, a front gland 17 and a front labyrinth nut 18 for mounting the front bearing 6, a liquid backflow pressure reduction recovery box 20 for cooling liquid circulation and the like.

Specifically, the flow of the rotor cooling liquid is as follows:

the coolant flows from the coolant pool circulating pump → the rotary joint group 22 → the coolant inflow passage of the liquid split rotary shaft 2 → the spindle core 1 cooling chamber → the coolant outflow passage of the liquid split rotary shaft 2 → the liquid flow guide cover 19 → the liquid reflux decompression recovery box 20 → the coolant pool pumpback → the coolant pool. Wherein, the cooling liquid inflow channel is arranged at the axle center of the liquid diversion rotating shaft 2, and the cooling liquid outflow channel is arranged on the mounting table at the outer side of the liquid diversion rotating shaft 2.

Specifically, the stator cooling liquid flows as follows:

the coolant flows from the cooling pool circulating pump → the motor stator cooling inlet 24 → the water jacket case 8 → the motor stator cooling outlet 25 → the cooling pool. Specifically, the inside of the water jacket case 8 flows in the coolant, and takes away the heat of the inner bearing and the stator 10.

It should be noted that the motor stator cooling inlet 24 and the motor stator cooling outlet 25 are respectively communicated with the water jacket housing 8, a specific pipeline is not shown in the drawing, and the water chambers in the water jacket housing 8 are communicated with each other through an internal thin pipe.

It should be further explained that the cooling liquid is discharged from the cooling tank and enters into the part to be cooled, the cooling liquid is pumped back to the cooling tank of the cooling machine after heat absorption is finished, temperature control is performed through the cooling device, and the cooling liquid enters the inner cavity of the main shaft and the water jacket shell 8 to form a temperature control cycle after being cooled. The electric spindle adopts the design of a sealing piece, a mechanical sealing structure and a special cavity, and can ensure that an inner cooling medium is far away from a dynamic and static matching sealing surface under the action of centrifugal force, thereby ensuring reliable sealing in a pumping forced backflow mode. The pumping forced reflux mode specifically refers to: the working flow of the liquid inlet pump and the liquid return pump is the same, and the liquid level of the liquid return detention cavity is ensured to be constant. The rare earth permanent magnet synchronous electric spindle is reliable in torque output and stable in rotating speed under the control of a matched technical parameter driver.

As shown in fig. 1, a power U line port 26, a power V line port 27, and a power W line port 28 for the stator are provided on the side surface of the liquid reflux decompression recovery box, and electric wires for the stator are connected to the power U line port 26, the power V line port 27, and the power W line port 28 through the first lead hole 7 and the second lead hole 11.

Specifically, the motor stator and the rotor are cooled by controlling the temperature at the same time, the same cooler or two coolers can be used for the stator and the rotor, and the temperature of each heating part of the main shaft is managed, so that the precision management in the length direction of the shaft is realized, and the high-precision machining is realized. The cooler includes the cooling bath, sets up at inside temperature sensor of cooling bath and circulating pump and be used for the cooling device of coolant temperature control, and the end setting of intaking of circulating pump is inside the cooling bath. The temperature sensor collects the temperature of the cooling pool in real time and cooperates with the cooling device to form temperature closed-loop control. An existing cooling machine, such as an AK series industrial water chiller, may also be used, wherein the cooling device may be a semiconductor cooling device or a compression cooling device in the prior art, and the compression cooling device conducts cold through fins.

In specific implementation, the number of the circulating pumps can be three or four, and a plurality of circulating pumps are arranged so as to realize forced backflow of pumping, wherein: the input port of the first circulating pump is communicated with the inside of the cooling pool and the output port is communicated with the cooling inlet 24 of the motor stator, the input port of the second circulating pump is communicated with the inside of the cooling pool and the output port is connected with the rotary joint group 22, the input port of the third circulating pump is connected with the rear pipe joint 14 and the output port is communicated with the inside of the cooling pool, and under individual conditions, a fourth circulating pump can be arranged on a pipeline of the cooling outlet 25 of the motor stator communicated with the cooling pool.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (6)

1. The utility model provides a synchronous carving of interior cooling permanent magnetism of axle mills electricity main shaft, characterized in that, including rotatable main shaft axle core (1), be used for cooling main shaft axle core (1) liquid reposition of redundant personnel pivot (2), be used for supporting rear bearing (3) and front bearing (6) of main shaft axle core (1), be used for cooling stator (10) and internal bearing's water jacket casing (8), be used for the preceding coupling (12) of air curtain protection, be used for connecting back coupling (14) of coolant liquid, be used for installing preceding gland (17) and preceding labyrinth nut (18) of front bearing (6), and be used for the liquid backward flow decompression of coolant liquid circulation to retrieve box (20), wherein:

a chuck (15) is mounted at one end of the spindle core (1) through a chuck nut (16), the chuck (15) is used for mounting a machining tool, and a cooling cavity is formed in one end of the spindle core (1);

one end of the liquid diversion rotating shaft (2) is installed in the cooling cavity, the other end of the liquid diversion rotating shaft (2) is provided with a rotary joint group (22), the center of the liquid diversion rotating shaft (2) is provided with a cooling liquid inflow channel in a penetrating mode, a mounting table of the liquid diversion rotating shaft (2) is provided with a cooling liquid outflow channel, one side of the mounting table is close to the rear bearing (3), the other side of the mounting table is provided with a liquid diversion cover (19), the liquid backflow decompression recovery box (20) is buckled on the mounting table and the liquid diversion cover (19) through a recovery box cover (21), and the rotary joint group (22) is provided with an axle center inner cooling inlet (23);

the rear bearing (3) is arranged at the rear end of the spindle shaft core (1) through a rear bearing seat (13), and the bearing seat (13) is arranged between the water jacket shell (8) and the liquid reflux pressure-reducing recovery box (20);

the front bearing (6) is arranged at the front end of the spindle shaft core (1) through a front bearing seat (9), the front bearing seat (9) is arranged inside the water jacket shell (8) through an external front gland (17), the front gland (17) is fixedly arranged through a front labyrinth nut (18), and a front inner spacer ring (4) and a front outer spacer ring (5) are arranged inside the front bearing (6);

a first lead hole (7) is formed in the bearing seat (13), and a second lead hole (11) is formed in the liquid reflux pressure-reducing recovery box (20); a motor stator cooling inlet (24) and a motor stator cooling outlet (25) are formed in the side face of the water jacket shell (8);

the stator (10) is arranged in the middle of the water jacket shell (8), and a power supply U line interface (26), a power supply V line interface (27) and a power supply W line interface (28) for the stator (10) are arranged on the side surface of the liquid reflux pressure-reducing recovery box (20); the front pipe joint (12) is arranged on the front gland (17) and is connected with high-pressure gas for gas curtain protection;

the rear pipe joint (14) is arranged on the liquid reflux pressure-reducing recovery box (20) and is connected with a cavity inside the liquid reflux pressure-reducing recovery box (20).

2. The in-core cooling permanent magnet synchronous engraving and milling electric spindle according to claim 1, characterized in that a plurality of water cavities are uniformly arranged inside the water jacket shell (8), and the water cavities are connected with cooling liquid through a motor stator cooling inlet (24) and a motor stator cooling outlet (25).

3. The in-core cooling permanent magnet synchronous engraving and milling electric spindle as claimed in claim 2, wherein one end of the in-core cooling inlet (23) is connected with a cooling liquid inflow channel of the liquid diversion rotating shaft (2) through threads, and the other end of the in-core cooling inlet (23) is connected with the cooling liquid.

4. The in-core cooling permanent magnet synchronous engraving and milling electric spindle according to claim 3, further comprising a cooling pool, a temperature sensor and a circulating pump arranged inside the cooling pool, and a cooling device for controlling the temperature of the cooling liquid, wherein the circulating pump is used for circulating the cooling liquid among the cooling pool, the water jacket shell (8) and the cooling cavity, and the temperature sensor is used for acquiring the temperature of the cooling pool in real time and cooperating with the cooling device to form temperature closed loop control.

5. The in-core cooling permanent magnet synchronous engraving and milling electric spindle according to claim 4, wherein the cooling device comprises a semiconductor refrigeration device or a compression cooling device.

6. The in-core cooling permanent magnet synchronous engraving and milling electric spindle according to claim 4, wherein the number of the circulating pumps is three, wherein: the first circulating pump is installed in the cooling pool and is connected with a motor stator cooling inlet (24), the second circulating pump is installed in the cooling pool and is connected with a rotary joint group (22), and the third circulating pump is installed in the cooling pool and is connected with a rear pipe joint (14).

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