A cooling method for vertical electric spindle

Abstract

The present invention discloses a cooling method for a vertical electric spindle, belonging to the technical field of electric spindle cooling, comprising: a stator, a first end cover and a second end cover respectively connected to the stator; wherein the stator, the first end cover and the second end cover are connected to form a closed space; further comprising a rotor arranged in the closed space, a first cooling channel arranged through the first end cover, and a second cooling channel arranged through the second end cover; a temperature sensor for obtaining the temperature of the coolant after cooling. The present invention solves the technical problem of poor circulating cooling effect, improves the machining accuracy and stability of the electric spindle, and achieves the technical effect of fully cooling the cooling system of the vertical electric spindle.

Description

Technical Field

[0001] The invention relates to the technical field of electric spindle cooling, and in particular to a vertical electric spindle cooling method. Background Art

[0002] In the modern machinery manufacturing process, the error caused by thermal deformation is as high as 50%, especially in high-speed and high-precision machining, the proportion is as high as 60% to 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. Because the electric spindle motor is built-in and the housing is closed, the heat generated by the motor power loss and the heat generated by the friction of the front and rear bearings cannot be effectively and timely discharged, and a large amount of heat accumulates in the shaft core rotor, causing the shaft core bearing rotor part to expand due to heat, resulting in serious thermal deformation, changing the matching clearance between the original parts, and the resulting error is superimposed on the machining center point (TCP), which ultimately reduces the machining accuracy of the electric spindle.

[0003] Traditional electric spindles usually use coolant (water or oil) to circulate and cool the motor stator and the electric spindle housing. However, the traditional cooling method does not adjust the coolant flow rate according to the heating of the electric spindle. There is overcooling or insufficient cooling during the cooling process, resulting in poor cooling effect, which affects the machining accuracy and stability of the electric spindle. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a vertical electric spindle cooling method, based on a vertical electric spindle cooling system, the vertical electric spindle cooling system comprises:

[0005] A stator, a first end cover and a second end cover respectively connected to the stator;

[0006] Wherein, the stator, the first end cover and the second end cover are connected to form a closed space;

[0007] Also included is a rotor disposed in the enclosed space, a first cooling channel disposed through the first end cover, and a second cooling channel disposed through the second end cover;

[0008] A temperature sensor is used to obtain the temperature of the coolant after cooling;

[0009] The vertical electric spindle cooling method comprises the following steps:

[0010] Preset the first cooling after the coolant temperature sequence,

[0011] The first post-cooling coolant temperature sequence is a sequence obtained by arranging the first post-cooling coolant temperature values ​​in chronological order when the system is operating normally;

[0012] determining a second post-cooling coolant temperature sequence based on a second post-cooling coolant temperature value at at least one moment,

[0013] The second cooling coolant temperature sequence is a sequence of second cooling coolant temperature values ​​at at least one moment arranged in chronological order;

[0014] Determine coolant adjustment information at at least one time point based on the second cooling coolant temperature sequence, the first cooling coolant temperature sequence, and the dynamic threshold set,

[0015] The dynamic threshold value set is a threshold value set used to determine whether the coolant flow needs to be adjusted when the vertical electric spindle is working;

[0016] The flow rate of the coolant is adjusted based on the coolant adjustment information.

[0017] In some embodiments, the first cooling channel includes: a first cooling sub-channel, and a second cooling sub-channel connected to the first cooling sub-channel;

[0018] The first cooling sub-channel is arranged to penetrate the first end cover and is used to introduce external cooling liquid into the closed space; the second cooling sub-channel is an annular structure, and a through hole is arranged at the bottom thereof.

[0019] In some embodiments, the first end cover comprises: a first sealing ring, a first sealing ring is further provided on the first sealing ring, and the first sealing ring and the first sealing ring are sleeved on the rotor;

[0020] The second end cover comprises: a second sealing ring and a third sealing ring, the third sealing ring is sleeved on the rotor, and the second sealing ring is matched with the third sealing ring.

[0021] In some embodiments, a first annular structure is disposed on the top of the second sealing ring, a second annular structure is disposed on the bottom of the third sealing ring, and the second annular structure is sleeved on the outer circumference of the first annular structure;

[0022] It also includes: a third end cover connected to the stator,

[0023] The third end cover is provided with a receiving groove and a third cooling channel connected to the receiving groove;

[0024] A second sealing ring is also provided at the connection between the third end cover and the second end cover.

[0025] In some embodiments, determining coolant adjustment information at at least one time point includes:

[0026] Determine the temperature deviation value based on the first cooling coolant temperature sequence and the second cooling coolant temperature sequence,

[0027] Temperature deviation value = coolant temperature value after the second cooling - coolant temperature value after the first cooling;

[0028] Coolant adjustment information is generated based on the temperature deviation value and the dynamic threshold set.

[0029] In some embodiments, the dynamic threshold set is set based on the processing accuracy, specifically in the following manner: ,

[0030] in, is the dynamic threshold; is the basic threshold; is the accuracy grade; is the adjustment factor.

[0031] In some embodiments, generating coolant adjustment information based on the temperature deviation value and the dynamic threshold set includes:

[0032] When the temperature deviation value is greater than the first adjustment threshold, generating first coolant adjustment information;

[0033] When the temperature deviation value is less than the first adjustment threshold, second coolant adjustment information is generated.

[0034] In some embodiments, generating the first coolant adjustment information includes:

[0035] calculating a first coolant flow rate;

[0036] The calculation method of the first coolant flow rate is:

[0037] ,

[0038] in, For the Coolant flow rate during a sampling period; For the Coolant flow rate during a sampling period; is the proportional gain; is the differential gain; For the Temperature deviation value of each sampling period; For the Temperature deviation value of each sampling period; is the sampling period, that is, the time interval between two consecutive sampling points.

[0039] In some embodiments, generating the second coolant adjustment information includes:

[0040] calculating the second coolant flow rate;

[0041] The second coolant flow rate is calculated as follows:

[0042] ,

[0043] in, For the Coolant flow rate during each sampling period; For the Coolant flow rate during a sampling period; is the proportional gain; is the integral gain; is the differential gain; It is the accumulated value of all deviations from the beginning to the current moment; For the Temperature deviation value of each sampling period; For the Temperature deviation value of each sampling period; is the sampling period, that is, the time interval between two consecutive sampling points.

[0044] By adopting the above technical solution, the present invention mainly has the following technical effects:

[0045] Based on the working process of the vertical electric spindle cooling system, the temperature deviation value is determined by the coolant temperature sequence after cooling, and the coolant adjustment information is generated according to the temperature deviation value and the dynamic threshold set, which solves the technical problem of poor circulating cooling effect, improves the machining accuracy and stability of the electric spindle, and achieves the technical effect of fully cooling the vertical electric spindle cooling system. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 A cooling schematic diagram of a vertical electric spindle cooling system of the present invention;

[0047] Figure 2 for Figure 1 A magnified view of part A;

[0048] Figure 3 for Figure 1 A magnified view of part B;

[0049] Figure 4 for Figure 3 Enlarged view of part C;

[0050] Figure 5 The present invention is a flow chart of a vertical electric spindle cooling method.

[0051] The meanings of the reference numerals are as follows:

[0052] 1. Stator;

[0053] 2. first end cover; 21. first sealing ring; 22. first sealing ring;

[0054] 3. Second end cover; 31. Second sealing ring; 311. First annular structure; 32. Third sealing ring; 321. Second annular structure;

[0055] 4. rotor; 41. rotating shaft; 42. fixing groove;

[0056] 5. first cooling channel; 51. first cooling sub-channel; 52. second cooling sub-channel;

[0057] 6. Second cooling channel;

[0058] 7. The third end cover; 71. The receiving groove; 72. The third cooling channel; 73. The second sealing ring. DETAILED DESCRIPTION

[0059] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the specification of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0061] See also Figure 1-Figure 4 The present invention provides a vertical electric spindle cooling method based on a vertical electric spindle cooling system, the vertical electric spindle cooling system comprising: a stator 1, a first end cover 2 and a second end cover 3 respectively connected to the top and the bottom of the stator 1; wherein the stator 1 is connected with the first end cover 2 at the top and the second end cover 3 at the bottom to form a closed space; the electric spindle cooling system further comprises a rotor 4 arranged in the closed space, a first cooling channel 5 arranged through the first end cover 2, and a second cooling channel 6 arranged through the second end cover 3.

[0062] Furthermore, the stator 1 is connected with the first end cover 2 and the second end cover 3 to form a closed space, which can effectively prevent foreign matter from entering the interior of the vertical electric spindle cooling system, and can also prevent mechanical collision from damaging the internal structure of the vertical electric spindle cooling system, thereby playing a good protective role. Among them, the stator 1 is a stationary fixed part of the vertical electric spindle cooling system, which can generate a rotating magnetic field after current is passed; the rotor 4 is the rotating part of the vertical electric spindle cooling system, which can obtain electromagnetic torque and rotate under the action of the rotating magnetic field generated by the stator 1 based on the electromagnetic induction phenomenon.

[0063] Furthermore, the rotor 4 is connected to the first end cover 2 and the second end cover 3 respectively through bearings, so that the first end cover 2 and the second end cover 3 play a role in fixing the rotor 4. In some embodiments, a stepped fixing groove 42 is provided on the rotating shaft 41 of the rotor 4, and the rotating shaft 41 is connected to the bearing through the fixing groove 42, so as to prevent the bearing from being displaced along the rotating shaft 41 when the vertical electric spindle cooling system is working. In addition, a circular through hole for the rotor 4 to pass through is provided in the center 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 hole to be connected with other transmission components or parts.

[0064] 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 to connecting the milling machine to the motor via a gearbox, the power loss caused by the gearbox can be reduced. An exemplary power loss may be the energy lost by the gearbox during the transmission process due to internal friction, rotation, vibration, etc., which is dissipated in the form of heat energy, thereby resulting in a decrease in mechanical efficiency.

[0065] Furthermore, the first cooling channel 5 is arranged to penetrate the first end cover 2. In some embodiments, the first cooling channel 5 is used to introduce the coolant into the closed space, and the coolant absorbs the heat on the stator 1 and / or the rotor 4, thereby cooling the stator 1 and / or the rotor 4, thereby reducing the temperature inside the vertical electric spindle, and avoiding the stator 1 and / or the rotor 4 from being thermally deformed due to excessive temperature, which affects the machining accuracy of the vertical electric spindle. On the other hand, the machining accuracy and stability of the vertical electric spindle can be improved by improving the machining accuracy and stability of the rotor 4 during operation. Exemplarily, the coolant can be cooling oil, which has the characteristics of being partially non-magnetic, non-flammable, non-conductive and having good thermal conductivity. Using cooling oil as a coolant has no effect on the magnetic circuit of the electric spindle cooling system, and has higher heat dissipation efficiency.

[0066] In some embodiments, the first cooling channel 5 includes: a first cooling sub-channel 51, and a second cooling sub-channel 52 connected to the first cooling sub-channel 51; wherein, the first cooling sub-channel 51 is arranged to pass through the first end cover 2, and is used to introduce external coolant into the closed space; the second cooling sub-channel 52 is an annular structure, and a through hole is provided at the bottom; the coolant entering the first cooling channel 5 first enters the second cooling sub-channel 52 through the first cooling sub-channel 51, and then disperses circumferentially into the closed space through the through holes in the second cooling sub-channel 52, and contacts the stator 1 and / or the rotor 4, thereby cooling the stator 1 and / or the rotor 4 in the closed space.

[0067] Furthermore, the second cooling channel 6 is arranged through the second end cover 3. In some embodiments, the second cooling channel 6 is used to discharge the coolant after cooling the stator 1 and / or the rotor 4 in the closed space, thereby realizing a circulating cooling process of the coolant.

[0068] In some embodiments, the first end cover 2 also includes: a first sealing ring 21, the first sealing ring 21 is connected to the first end cover 2, and a first sealing ring 22 is also provided on the first sealing ring 21. The first sealing ring 21 and the first sealing ring 22 are sleeved on the rotor 4 to enhance the sealing performance of the connection between the first end cover 2 and the rotor 4.

[0069] In some embodiments, the second end cover 3 also includes: a second sealing ring 31, which is connected to the second end cover 3; and a third sealing ring 32, which is sleeved on the rotor 4, and the second sealing ring 31 is adapted to the third sealing ring 32 to enhance the sealing performance at the connection between the second end cover 3 and the rotor 4.

[0070] In some more preferred embodiments, a first annular structure 311 is provided on the top of the second sealing ring 31, and a second annular structure 321 is provided on the bottom of the third sealing ring 32, and the second annular structure 321 is sleeved on the outer periphery of the first annular structure 311; by designing the second annular structure 321 to be sleeved on the first annular structure 311, when the vertical electric spindle cooling system is working, the coolant will move downward along the second annular structure 321, thereby preventing the coolant from entering the connection between the second end cover 3 and the rotor 4, thereby enhancing the sealing of the connection between the second end cover 3 and the rotor 4.

[0071] Furthermore, the vertical electric spindle cooling system also includes: a third end cover 7 connected to the stator 1. In some embodiments, the third end cover 7 is provided with an annular receiving groove 71, and a third cooling channel 72 connecting the receiving groove 71 with the outside; wherein, the receiving groove 71 is provided below the second cooling channel 6, for receiving the cooled coolant discharged from the second cooling channel 6; it should be noted that the cooled coolant refers to the coolant after cooling the stator 1 and / or the rotor 4, and the third cooling channel 72 is used to discharge the cooled coolant in the receiving groove 71 to the external structure of the vertical electric spindle cooling system.

[0072] In some more preferred embodiments, a second sealing ring 73 is further provided at the connection between the third end cover 7 and the second end cover 3 to enhance the sealing performance of the connection between the third end cover 7 and the second end cover 3 .

[0073] Furthermore, the electric spindle cooling system also includes a temperature sensor. In some embodiments, the temperature sensor can be disposed in the receiving groove 71 or in the third cooling channel 72 to obtain the temperature of the coolant after cooling.

[0074] See also Figure 5 , the vertical electric spindle cooling method comprises the following steps:

[0075] S1, preset a first cooling liquid temperature sequence;

[0076] The first post-cooling coolant temperature sequence is a sequence obtained by arranging the first post-cooling coolant temperature values ​​at at least one moment in time in chronological order, wherein the chronological order may be chronological order or chronological reverse order.

[0077] In some embodiments, the first post-cooling coolant temperature value may be a temperature parameter representing the coolant temperature of the vertical electric spindle cooling system after cooling the stator 1 and / or the rotor 4 within a certain period of time.

[0078] In some embodiments, the first post-cooling coolant temperature sequence is a sequence obtained by arranging the first post-cooling coolant temperature values ​​in chronological order during normal operation.

[0079] In some embodiments, the temperature value of the coolant after the first cooling can be measured by a temperature sensor.

[0080] In some embodiments, the first cooling coolant temperature sequence can be obtained by processing the first cooling coolant temperature value at at least one moment through mathematical fitting, artificial intelligence, etc.

[0081] In some embodiments, the coolant temperature sequence after the first cooling can be determined by establishing a database based on industry experience, historical data and other information.

[0082] S2, determining a second cooling coolant temperature sequence based on a second cooling coolant temperature value at at least one moment;

[0083] The second post-cooling coolant temperature value may be a temperature parameter when the vertical electric spindle cooling system is working, and the second post-cooling coolant temperature sequence is a sequence obtained by arranging the second post-cooling coolant temperature value at at least one moment in time in chronological order. For example, the second post-cooling coolant temperature sequence includes the second post-cooling coolant temperature value 1, the second post-cooling coolant temperature value 2, the second post-cooling coolant temperature value N, etc. when the vertical electric spindle cooling system is working.

[0084] In some embodiments, the second post-cooling coolant temperature value can be measured by a temperature sensor when the vertical electric spindle cooling system is working.

[0085] S3, determining coolant adjustment information at at least one time point based on the second cooling coolant temperature sequence, the first cooling coolant temperature sequence, and the dynamic threshold set;

[0086] The dynamic threshold set refers to a threshold set used to determine whether the cooling liquid flow rate of the vertical electric spindle cooling system needs to be adjusted when it is working. In some embodiments, the dynamic threshold set can be set based on the processing accuracy or processing time requirements. For example, in application scenarios with higher processing accuracy requirements, the dynamic threshold is smaller. In some embodiments, the dynamic threshold set is set based on the processing accuracy, specifically in the following manner:

[0087] ,

[0088] in, is the dynamic threshold; is the basic threshold; is the accuracy grade; is the adjustment factor.

[0089] In some embodiments, by setting a dynamic threshold set, false alarms caused by the mismatch between the threshold and the processing scenario are greatly reduced. On the other hand, the vertical electric spindle cooling system can also generate coolant adjustment information in time during processing, especially when dealing with high-precision processing, thereby improving processing accuracy.

[0090] In some embodiments, the coolant adjustment information can be obtained by comparing the coolant temperature sequence after the second cooling and the coolant temperature sequence after the first cooling to determine the deviation between the coolant temperature value after the second cooling and the coolant temperature value after the first cooling at the same working time, and comparing the deviation with the temperature threshold in the dynamic threshold set. When one or more data exceeds the threshold in the dynamic threshold set, the coolant adjustment information is generated.

[0091] In some more preferred embodiments, determining the coolant adjustment information at at least one time point includes:

[0092] S301, determining a temperature deviation value based on a first cooling coolant temperature sequence and a second cooling coolant temperature sequence;

[0093] In some embodiments, the temperature deviation value can be determined by the first cooling coolant temperature value and the second cooling coolant temperature value at the same working moment; in some embodiments, the temperature deviation value = the second cooling coolant temperature value - the first cooling coolant temperature value.

[0094] S302, generating coolant adjustment information based on the temperature deviation value and the dynamic threshold set;

[0095] In some embodiments, when the temperature deviation value exceeds a threshold in the dynamic threshold set, coolant adjustment information is generated.

[0096] The generating of coolant adjustment information based on the temperature deviation value and the dynamic threshold set includes:

[0097] When the temperature deviation value is greater than the first adjustment threshold, generating first coolant adjustment information;

[0098] When the temperature deviation value is less than the first adjustment threshold, generating second coolant adjustment information;

[0099] In some embodiments, generating the first coolant adjustment information includes:

[0100] calculating a first coolant flow rate;

[0101] The calculation method of the first coolant flow rate is:

[0102] ,

[0103] in, For the Coolant flow rate during a sampling period; For the Coolant flow rate during a sampling period; is the proportional gain; is the differential gain; For the Temperature deviation value of each sampling period; For the Temperature deviation value of each sampling period; is the sampling period, that is, the time interval between two consecutive sampling points.

[0104] In some embodiments, generating the second coolant adjustment information includes:

[0105] calculating the second coolant flow rate;

[0106] The second coolant flow rate is calculated as follows:

[0107] ,

[0108] in, For the Coolant flow rate during a sampling period; For the Coolant flow rate during a sampling period; is the proportional gain; is the integral gain; is the differential gain; It is the accumulated value of all deviations from the beginning to the current moment; For the Temperature deviation value of each sampling period; For the Temperature deviation value of each sampling period; is the sampling period, that is, the time interval between two consecutive sampling points.

[0109] In some embodiments, when the temperature deviation value exceeds the threshold value in the dynamic threshold set, it can be determined whether to introduce an integral term according to the size of the temperature deviation value, so as to improve the cooling performance of the vertical electric spindle cooling system. Specifically, when the temperature deviation value is large, that is, the error is large, the integral effect is cancelled to avoid overshoot and oscillation caused by integral accumulation; when the temperature deviation value is small, that is, the error is small and close to the set value, the integral control is introduced to eliminate the static error and improve the control accuracy, thereby improving the control accuracy of the coolant flow.

[0110] S4, adjusting the flow rate of the coolant based on the coolant adjustment information;

[0111] In some embodiments, the flow rate of the coolant refers to the flow rate of the coolant entering the first cooling channel 5 .

[0112] In some embodiments, after the coolant adjustment information is obtained, the flow rate of the coolant flowing into the first cooling channel 5 can be adjusted by controlling the opening of the flow valve.

[0113] Finally, it should be noted that the embodiments disclosed in the present invention are only preferred embodiments of the present invention, which are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A vertical electric spindle cooling method, characterized in that: Based on a vertical electric spindle cooling system, the vertical electric spindle cooling system comprises: A stator, a first end cover and a second end cover respectively connected to the stator; Wherein, the stator, the first end cover and the second end cover are connected to form a closed space; Also included is a rotor disposed in the enclosed space, a first cooling channel disposed through the first end cover, and a second cooling channel disposed through the second end cover; A temperature sensor is used to obtain the temperature of the coolant after cooling; The vertical electric spindle cooling method comprises the following steps: Preset the first cooling after the coolant temperature sequence, The first post-cooling coolant temperature sequence is a sequence obtained by arranging the first post-cooling coolant temperature values ​​in chronological order during normal operation. The first post-cooling coolant temperature value is a temperature parameter characterizing the coolant of the vertical electric spindle cooling system after cooling the stator and / or the rotor within a period of time. The first post-cooling coolant temperature value is measured by a temperature sensor; determining a second post-cooling coolant temperature sequence based on a second post-cooling coolant temperature value at at least one moment, The second post-cooling coolant temperature sequence is a sequence obtained by arranging the second post-cooling coolant temperature values ​​at at least one moment in time in chronological order, the second post-cooling coolant temperature value is a temperature parameter when the vertical electric spindle cooling system is working, and the second post-cooling coolant temperature value is measured by a temperature sensor when the vertical electric spindle cooling system is working; Determine coolant adjustment information at at least one time point based on the second cooling coolant temperature sequence, the first cooling coolant temperature sequence, and the dynamic threshold set, The dynamic threshold value set is a threshold value set used to determine whether the coolant flow needs to be adjusted when the vertical electric spindle is working. The dynamic threshold set is set based on the processing accuracy, specifically: , in, is the dynamic threshold; is the basic threshold; is the accuracy grade; is the adjustment factor; adjusting the flow rate of the coolant based on the coolant adjustment information; Determining the coolant adjustment information at at least one time point includes: Determine the temperature deviation value based on the first cooling coolant temperature sequence and the second cooling coolant temperature sequence, Temperature deviation value = coolant temperature value after the second cooling - coolant temperature value after the first cooling; generating coolant adjustment information based on the temperature deviation value and the dynamic threshold set; The generating of coolant adjustment information based on the temperature deviation value and the dynamic threshold set includes: When the temperature deviation value is greater than the first adjustment threshold, generating first coolant adjustment information; When the temperature deviation value is less than the first adjustment threshold, generating second coolant adjustment information; The generating the first coolant adjustment information comprises: calculating a first coolant flow rate; The calculation method of the first coolant flow rate is: , in, For the Coolant flow rate during each sampling period; For the Coolant flow rate during each sampling period; is the proportional gain; is the differential gain; For the Temperature deviation value of each sampling period; For the Temperature deviation value of each sampling period; is the sampling period, i.e., the time interval between two consecutive sampling points; The generating the second coolant adjustment information comprises: calculating the second coolant flow rate; The second coolant flow rate is calculated as follows: ， in, For the Coolant flow rate during a sampling period; For the Coolant flow rate during each sampling period; is the proportional gain; is the integral gain; is the differential gain; It is the accumulated value of all deviations from the beginning to the current moment; For the Temperature deviation value of each sampling period; For the Temperature deviation value of each sampling period; is the sampling period, that is, the time interval between two consecutive sampling points.

2. A vertical electric spindle cooling method according to claim 1, characterized in that: The first cooling channel comprises: a first cooling sub-channel, and a second cooling sub-channel connected to the first cooling sub-channel; The first cooling sub-channel is arranged to penetrate the first end cover and is used to introduce external cooling liquid into the closed space; the second cooling sub-channel is an annular structure, and a through hole is arranged at the bottom thereof.

3. A vertical electric spindle cooling method according to claim 1, characterized in that: The first end cover comprises: a first sealing ring, a first sealing ring is further provided on the first sealing ring, and the first sealing ring and the first sealing ring are sleeved on the rotor; The second end cover comprises: a second sealing ring and a third sealing ring, the third sealing ring is sleeved on the rotor, and the second sealing ring is matched with the third sealing ring.

4. A vertical electric spindle cooling method according to claim 3, characterized in that: A first annular structure is provided on the top of the second sealing ring, a second annular structure is provided on the bottom of the third sealing ring, and the second annular structure is sleeved on the outer circumference of the first annular structure; It also includes: a third end cover connected to the stator, The third end cover is provided with a receiving groove and a third cooling channel connected to the receiving groove; A second sealing ring is also provided at the connection between the third end cover and the second end cover.

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