Electric spindle cooling system

Abstract

The utility model discloses a motorized spindle cooling system, which belongs to the technical field of motorized spindle cooling, and comprises a stator, a first end cover and a second end cover which are respectively connected with two sides of the stator, and a rotor arranged in the closed space, and the stator is connected with the first end cover and the second end cover which are arranged on two sides of the stator to form the closed space. The first cooling flow channel is formed in the rotor; the rotor comprises a rotating shaft; the rotating shaft is further provided with a second cooling flow channel, and the second cooling flow channel is communicated with the first cooling flow channel and the outer surface of the rotating shaft. The technical problem that the circulating cooling effect is poor is solved, the cooling effect of the electric spindle cooling system can be improved, and therefore the machining precision and stability of an electric spindle are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric spindle cooling, and particularly relates to an electric spindle cooling system. Background Art

[0002] In the modern mechanical manufacturing process, the error caused by thermal deformation reaches 50%. Especially in high-speed and high-precision machining, this proportion is as high as 60% - 80%. As a key component of high-speed and high-precision CNC machine tools, the performance of the electric spindle directly affects the machining accuracy of the machine tool. Since the electric spindle motor is built-in and the housing is closed, the heat generated by the power loss of the motor and the heat generated by the friction of the front and rear bearings cannot be effectively exported in time. A large amount of heat accumulates at the shaft core rotor, resulting in the thermal expansion of the shaft core bearing rotor part, serious thermal deformation, changing the original clearance between parts, and the formed error is superimposed on the machining center point (TCP), ultimately reducing the machining accuracy of the electric spindle.

[0003] The traditional electric spindle usually uses a coolant (water or oil) to circulate and cool the motor stator and the electric spindle housing. However, the circulating cooling effect is poor, and usually only one end of the electric spindle can be cooled, thus affecting the machining accuracy and stability of the electric spindle. Summary of the Utility Model

[0004] To solve the above problems, the utility model provides an electric spindle cooling system, including: a stator, a first end cover and a second end cover respectively connected to both sides of the stator,

[0005] Wherein, after the stator is connected to the first end cover and the second end cover on both sides, a closed space is formed, and further includes a rotor arranged in the closed space, and a first cooling flow channel opened in the rotor;

[0006] The rotor includes a rotating shaft;

[0007] A second cooling flow channel is further arranged on the rotating shaft, and the second cooling flow channel is communicated with the first cooling flow channel and the outer surface of the rotating shaft;

[0008] The second cooling flow channel includes a first cooling sub-flow channel group and a second cooling sub-flow channel group;

[0009] The first cooling sub-flow channel group is located on one side of the rotating shaft close to the first end cover, and the second cooling sub-flow channel group is located on one side of the rotating shaft close to the second end cover;

[0010] In some embodiments, the electric spindle cooling system further includes: a temperature sensor, and a controller electrically connected to the temperature sensor. Wherein, the temperature sensor is used to obtain the real-time temperature value of the coolant discharged through the first cooling sub-flow channel group, and the controller is used to adjust the coolant flow rate entering the first cooling flow channel according to the real-time temperature value fed back by the temperature sensor.

[0011] In some embodiments, the electric spindle cooling system further includes a first circulation channel, which is arranged on one side close to the second cooling sub-channel group, connects the enclosed space with the outside, and is used to discharge the coolant in the enclosed space.

[0012] In some embodiments, the electric spindle cooling system further includes a second circulation channel, which is arranged at the bottom of the enclosed space and is used to guide the cooled coolant discharged from the first cooling sub-channel group into the first circulation channel.

[0013] In some embodiments, the temperature sensor is arranged in the second circulation channel.

[0014] In some embodiments, the first cooling sub-channel group and the second cooling sub-channel group are arranged radially.

[0015] By adopting the above technical solutions, the present utility model mainly has the following technical effects:

[0016] By adjusting the cooling flow rate of the coolant through the temperature of the coolant discharged from the first cooling sub-channel group, on the one hand, the electric spindle can be cooled, and on the other hand, the side of the first cooling channel far from the coolant inlet can be fully cooled, thereby further improving the cooling effect of the electric spindle cooling system and improving the machining accuracy and stability of the electric spindle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cooling schematic diagram of an electric spindle cooling system of the present utility model.

[0018] Among them, the meanings of the reference numerals are as follows:

[0019] 1, stator;

[0020] 2, first end cover;

[0021] 3, second end cover;

[0022] 4, rotor; 41, rotating shaft;

[0023] 5, first cooling channel;

[0024] 6, second cooling channel; 61, first cooling sub-channel group; 62, second cooling sub-channel group;

[0025] 7, first circulation channel;

[0026] 8, second circulation channel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the specification drawings in the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0028] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present utility model. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive of other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0029] Please refer to Figure 1 , a first aspect of the present utility model provides an electric spindle cooling system, including: a stator 1, a first end cover 2 and a second end cover 3 respectively connected to both sides of the stator 1. Among them, after the stator 1 is connected to the first end cover 2 and the second end cover 3 on both sides, a closed space is formed. The electric spindle cooling system further includes a rotor 4 provided in the closed space, and a first cooling flow channel 5 opened in the rotor 4. It should be noted here that in the present utility model, the "axial direction" refers to the direction where the rotation center axis of the rotor is located, that is, the direction common with the central axis, and the "radial direction" is perpendicular to the axial direction.

[0030] Furthermore, after the stator 1 is connected to the first end cover 2 and the second end cover 3 on both sides, a sealed space is formed, which can effectively prevent foreign objects from entering the interior of the electric spindle cooling system, and at the same time can also prevent mechanical collision from damaging the internal structure of the electric spindle cooling system, thus playing a good protective role. Among them, the stator 1 is the stationary fixed part in the electric spindle cooling system, and can generate a rotating magnetic field after passing current; the rotor 4 is the rotating part of the electric spindle cooling system, and can obtain an electromagnetic torque and rotate under the action of the rotating magnetic field generated by the stator 1 based on the electromagnetic induction phenomenon. Among them, the rotor 4 includes a rotating shaft 41.

[0031] Furthermore, the rotor 4 is respectively connected to the first end cover 2 and the second end cover 3 through bearings, so as to use the first end cover 2 and the second end cover 3 to play a role in fixing the rotor 4. In addition, circular through holes for the rotor 4 to pass through are provided in the centers of the first end cover 2 and the second end cover 3, so that the rotor 4 can extend out of the closed space through the circular through holes to be connected to other transmission components or parts.

[0032] In some embodiments, the output end of the rotor 4 can be connected to a load such as a milling machine. By directly connecting the rotor 4 to the load, compared with connecting the milling machine to the motor via a gearbox, the power loss caused by the gearbox can be reduced. Exemplary power loss can be the energy lost due to internal friction, rotation, and vibration in the gearbox during the transmission process. This energy is dissipated in the form of heat, resulting in a decrease in mechanical efficiency.

[0033] Further, the first cooling channel 5 is formed in the rotating shaft 41, and the first cooling channel 5 is arranged along the axial direction of the rotating shaft 41. The first cooling channel 5 is used to introduce a coolant. By absorbing the heat on the rotor 4 through the coolant, the rotor 4 is cooled. By reducing the temperature inside the motor, the thermal deformation of the rotating shaft 41 due to excessive temperature can be avoided, which may affect the machining accuracy of the motorized spindle. Furthermore, by improving the machining accuracy and stability of the rotating shaft 41 during operation, the machining accuracy and stability of the motorized spindle can be enhanced. Exemplarily, the coolant can be a cooling oil, which has the characteristics of partial non-magnetic conductivity, non-flammability, non-conductivity, and good heat conduction. Using cooling oil as the coolant has no influence on the magnetic circuit of the motorized spindle cooling system and has a higher heat dissipation efficiency.

[0034] Further, a second cooling channel 6 is also provided on the rotating shaft 41. The second cooling channel 6 is arranged along the radial direction of the rotating shaft 41 and is connected to the first cooling channel 5 and the outer surface of the rotating shaft 41. After the coolant entering the first cooling channel 5 cools the rotating shaft 41, under the action of the high-speed rotation of the rotor 4, it will leave the rotating shaft 41 through the second cooling channel 6 and enter the enclosed space.

[0035] In some preferred embodiments, the second cooling channel 6 includes a first cooling sub-channel group 61 and a second cooling sub-channel group 62 arranged radially. By providing the first cooling sub-channel group 61 and the second cooling sub-channel group 62, on the one hand, the contact area between the coolant and the rotating shaft 41 can be effectively increased, thereby enhancing the cooling effect. On the other hand, the cooled coolant in the rotating shaft 41 can be discharged, realizing the circulating cooling process of the coolant.

[0036] In some more preferred embodiments, the first cooling sub-channel group 61 and the second cooling sub-channel group 62 are arranged in the enclosed space, and the first cooling sub-channel group 61 is located on the side of the rotating shaft 41 close to the first end cover 2, and the second cooling sub-channel group 62 is located on the side of the rotating shaft 41 close to the second end cover 3.

[0037] Furthermore, the electric spindle cooling system further includes a first circulation channel 7 and a second circulation channel 8. The first circulation channel 7 is disposed on one side close to the second cooling sub-channel group 62, connecting the enclosed space to the outside, and is used for discharging the cooled coolant in the enclosed space. The second circulation channel 8 is disposed at the bottom of the enclosed space and is used for guiding the cooled coolant discharged from the first cooling sub-channel group 61 into the first circulation channel 7.

[0038] In some embodiments, the electric spindle cooling system further includes a temperature sensor and a controller electrically connected to the temperature sensor. The temperature sensor is used to obtain the real-time temperature value of the coolant discharged from the first cooling sub-channel group 61, and the controller is used to adjust the coolant flow rate entering the first cooling channel 5 according to the real-time temperature value feedback by the temperature sensor. Exemplarily, when the real-time temperature value obtained by the temperature sensor is greater than the temperature threshold, the coolant flow rate entering the first cooling channel 5 can be increased; when the real-time temperature value obtained by the temperature sensor is less than or equal to the temperature threshold, the coolant flow rate entering the first cooling channel 5 can be maintained. In some embodiments, the temperature sensor is disposed in the second circulation channel 8.

[0039] The reason is as follows: As the coolant advances in the first cooling channel 5, the cooling effect on the side of the first cooling channel 5 close to the coolant inlet is better than that on the side far from the coolant inlet. Even in the cooling process of the electric spindle cooling system, there may be a phenomenon that the side of the first cooling channel 5 close to the coolant inlet is fully cooled while the side far from the coolant inlet is not fully cooled. In the long run, this will seriously affect the working performance of the electric spindle. Therefore, by measuring the temperature of the coolant discharged from the first cooling sub-channel group 61, the temperature of the coolant discharged from the first cooling sub-channel group 61 is kept below the temperature threshold, so as to ensure that the coolant still has a cooling effect when discharged from the first cooling sub-channel group 61.

[0040] By fully cooling the side of the first cooling channel 5 far from the coolant inlet, the cooling effect of the electric spindle cooling system is improved, and the machining accuracy and stability of the electric spindle are enhanced.

[0041] Finally, it should be noted that: What is disclosed in the embodiments of the present utility model is only the preferred embodiments of the present utility model, which are only used to illustrate the technical solutions of the present utility model and are not intended to limit them; Although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: They can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. An electric spindle cooling system, characterized in that, Comprising: A stator, a first end cover and a second end cover respectively connected to both sides of the stator, wherein, after the stator is connected to the first end cover and the second end cover on both sides, a closed space is formed, further comprising a rotor disposed in the closed space, and a first cooling flow channel opened in the rotor; The rotor includes a rotating shaft; A second cooling flow channel is further provided on the rotating shaft, and the second cooling flow channel is communicated with the first cooling flow channel and the outer surface of the rotating shaft; The second cooling flow channel includes a first cooling sub-flow channel group and a second cooling sub-flow channel group; The first cooling sub-flow channel group is located on one side of the rotating shaft close to the first end cover, and the second cooling sub-flow channel group is located on one side of the rotating shaft close to the second end cover.

2. The electro-spindle cooling system according to claim 1, wherein, Further comprising: A temperature sensor, and a controller electrically connected to the temperature sensor, wherein the temperature sensor is used to obtain the real-time temperature value of the coolant discharged through the first cooling sub-flow channel group, and the controller is used to adjust the coolant flow rate entering the first cooling flow channel according to the real-time temperature value fed back by the temperature sensor.

3. The electro-spindle cooling system according to claim 2, wherein Further comprising a first circulation flow channel, which is disposed on one side close to the second cooling sub-flow channel group, and communicates the closed space with the outside, for discharging the coolant in the closed space.

4. The electro-spindle cooling system according to claim 3, characterized in that, Further comprising a second circulation flow channel, which is disposed at the bottom of the closed space, for guiding the cooled coolant discharged from the first cooling sub-flow channel group to the first circulation flow channel.

5. The electro-spindle cooling system according to claim 4, characterized in that, The temperature sensor is disposed in the second circulation flow channel.

6. The electro-spindle cooling system according to claim 4, characterized in that, The first cooling sub-flow channel group and the second cooling sub-flow channel group are radially arranged.

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