Circulating cooling system for motorized spindle

Abstract

The utility model discloses a circulating cooling system for an electric spindle, which belongs to the technical field of electric 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, a rotor arranged in the closed space and a motor arranged in the rotor, 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 a 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 cooling flow of the cooling liquid is adjusted by obtaining the temperature of the mixed cooling liquid discharged by the first cooling sub-flow-channel group and the second cooling sub-flow-channel group, so that the effect of cooling the rotating shaft by the cooling liquid is optimal, the technical problem of poor circulating cooling effect is solved, and the machining precision and stability of the 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 circulating cooling system. Background Art

[0002] In the process of modern mechanical manufacturing, 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 motor of the electric spindle is built-in and the shell 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, and 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 fit 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, 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 circulating 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] It 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 first 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 obtaining the temperature of the mixed coolant after being discharged from the first cooling sub-channel group and the second cooling sub-channel group to adjust the cooling flow rate of the coolant, the cooling effect of the coolant on the rotating shaft is optimized, the technical problem of poor circulating cooling effect is solved, and thus the machining accuracy and stability of the electric spindle are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of a circulating cooling system for an electric spindle of the present utility model;

[0018] Figure 2 is a (partial) structural block diagram of a circulating cooling system for an electric spindle of the present utility model.

[0019] Among them, the meanings of the reference numerals are as follows:

[0020] 1, stator;

[0021] 2, first end cover;

[0022] 3, second end cover;

[0023] 4, rotor; 41, rotating shaft;

[0024] 5, first cooling channel;

[0025] 6, second cooling channel; 61, first cooling sub-channel group; 62, second cooling sub-channel group;

[0026] 7, first circulation channel;

[0027] 8, second circulation channel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] 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 with reference to the accompanying 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 of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.

[0029] Reference to "embodiment" herein 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 with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0030] Please refer to Figure 1 - Figure 2 , a first aspect of the present utility model provides an electric spindle circulating 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, a closed space is formed after the stator 1 is connected to the first end cover 2 and the second end cover 3 on both sides. 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. Here, it should be noted 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 to the central axis, and the radial direction is perpendicular to the axial direction.

[0031] Furthermore, a closed space is formed after the stator 1 is connected to the first end cover 2 and the second end cover 3 on both sides, 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 collisions from damaging the internal structure of the electric spindle cooling system, thereby 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 to 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.

[0032] 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.

[0033] 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. These energies are dissipated in the form of heat, resulting in a decrease in mechanical efficiency.

[0034] 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 can be cooled down. 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 improved. Exemplarily, the coolant can be cooling oil, which has the characteristics of local non-magnetic conductivity, non-flammability, non-conductivity, and good heat conduction. Using cooling oil as the coolant has no impact on the magnetic circuit of the motorized spindle cooling system and has a higher heat dissipation efficiency.

[0035] 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 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.

[0036] 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.

[0037] 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 one side of the rotating shaft 41 close to the first end cover 2, and the second cooling sub-channel group 62 is located on one side of the rotating shaft 41 close to the second end cover 3.

[0038] 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 to discharge the cooled coolant in the enclosed space. The second circulation channel 8 is disposed at the bottom of the enclosed space and is used to guide the cooled coolant discharged from the first cooling sub-channel group 61 into the first circulation channel 7.

[0039] In some embodiments, the electric spindle cooling system further includes: a temperature sensor and a controller electrically connected to the temperature sensor. Among them, the temperature sensor is disposed in the first circulation channel 7 and is used to obtain the real-time temperature value of the coolant mixed after being discharged from the first cooling sub-channel group 61 and the second cooling sub-channel group 62 respectively; the controller is used to adjust the coolant flow rate entering the first cooling channel 5 according to the real-time temperature value fed back by the temperature sensor. Exemplarily, when the real-time temperature value obtained by the temperature sensor is greater than the preset value, 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 preset value, 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.

[0040] By obtaining the temperature of the coolant mixed after being discharged from the first cooling sub-channel group 61 and the second cooling sub-channel group 62, and adjusting the cooling flow rate of the coolant, the cooling effect of the coolant on the rotating shaft can be optimized, thereby improving the cooling effect of the electric spindle cooling system. After the operator cools the coolant discharged from the first circulation channel 7 and then re-injects it into the first cooling channel 5, the circulating cooling process of the electric spindle can be realized.

[0041] Finally, it should be noted that: What is disclosed in the embodiments of the present invention is only the preferred embodiments of the present invention, and is only used to illustrate the technical solutions of the present invention, rather than limiting them; Although the present invention 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 invention.

Claims

1. A circulating cooling system for an electric spindle, 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 comprises 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 comprises 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; 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 mixed after being discharged through the first cooling sub-flow channel group and the second cooling sub-flow channel group respectively, 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.

2. The circulating cooling system for an electric spindle according to claim 1, wherein further comprising a first circulation flow channel, which is disposed on one side close to the second cooling sub-flow channel group, connects the closed space with the outside, and is used to discharge the coolant in the closed space.

3. The circulating cooling system for an electric spindle according to claim 2, characterized in that, further comprising a second circulation flow channel, which is disposed at the bottom of the closed space and is used to guide the cooled coolant discharged from the first cooling sub-flow channel group to the first circulation flow channel.

4. The circulating cooling system of an electric spindle according to claim 3, characterized in that, the temperature sensor is disposed in the first circulation flow channel.

5. The circulating cooling system of an electric spindle according to claim 3, 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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