A high-speed electric spindle core cooling device and its usage method

Abstract

The present invention relates to the technical field of electric spindle cooling, and particularly relates to a high-speed electric spindle core cooling device and a using method thereof, including: a spindle core, a liquid distribution plate, and a liquid supply plate for supplying liquid to the liquid distribution plate; the spindle core has a plurality of first passages and a plurality of second passages, and the liquid distribution plate is provided with a plurality of guiding passages; the liquid supply plate is provided with a plurality of drainage tubes corresponding to the guiding passages, one end of the drainage tube is fixed on the liquid supply plate, and the outer cylindrical surface of the other end is provided with a sealing ring and is embedded in the guiding passage; a sliding sleeve is arranged on the outer side of the liquid supply plate, the sliding sleeve is fixedly connected with the liquid supply plate and is slidably arranged with the liquid distribution plate, a driving member is arranged on the sliding sleeve, and the driving member drives the sliding sleeve to drive the liquid supply plate to move towards or away from the liquid distribution plate, so that the drainage tube makes a telescopic movement in the guiding passage, accelerating the flow rate of the cooling liquid, improving the cooling efficiency, reducing the temperature rise inside the electric spindle, improving the performance of the electric spindle, and prolonging the working life of the electric spindle.

Description

Technical Field

[0001] The present invention relates to the technical field of electric spindle cooling, and particularly relates to a high-speed electric spindle core cooling device and a using method thereof. Background Art

[0002] An electric spindle is a technology that integrates a machine tool spindle and a spindle motor in the field of numerical control machine tools. The electric spindle drives a cutting tool to rotate for workpiece machining. However, during the operation of the electric spindle, a large amount of heat is generated by the motor and bearings. If the generated heat is not removed in time, a complex temperature field will be formed inside the electric spindle, resulting in a sharp rise in temperature, serious thermal deformation, and affecting the service life, accuracy, and reliability of the electric spindle. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a high-speed electric spindle core cooling device and a using method thereof, which can effectively solve the problems in the background art.

[0004] To achieve the above object, the technical solution adopted by the present invention is: a high-speed electric spindle core cooling device, including: a spindle core, a liquid distribution plate disposed at the middle position of the spindle core, and a liquid supply plate for supplying liquid to the liquid distribution plate;

[0005] The spindle core is provided with a plurality of first passages and a plurality of second passages, and the liquid distribution plate is provided with a plurality of guide flow passages;

[0006] One end surface of the liquid supply plate facing the liquid distribution plate is provided with a plurality of drainage tubes corresponding to the guide flow passages. One end of the drainage tube is fixed on the liquid supply plate, and the outer cylindrical surface of the other end is provided with a sealing ring and is embedded in the guide flow passage;

[0007] A sliding sleeve is provided outside the liquid supply plate. The sliding sleeve is fixedly connected to the liquid supply plate and is slidably arranged with the liquid distribution plate. A driving member is provided on the sliding sleeve. The driving member drives the sliding sleeve to move axially and synchronously drives the liquid supply plate to move towards or away from the liquid distribution plate, so that the drainage tube makes a telescopic movement in the guide flow passage.

[0008] Further, the plurality of first passages and the plurality of second passages are arranged in a staggered manner along the circumferential direction, and the liquid inlets are located in different radial cross-sections;

[0009] The liquid distribution plate is provided with a plurality of guide flow passages communicating with the plurality of first passages and a plurality of guide flow passages communicating with the plurality of second passages.

[0010] Further, the liquid inlets of the plurality of first passages and the plurality of second passages are located in the same radial cross-section and are evenly distributed and staggered along the circumferential direction;

[0011] A plurality of the flow guiding passages communicate with a plurality of the first passages and a plurality of the second passages;

[0012] And the included angle between two adjacent flow guiding passages is equal to the included angle between two adjacent first passages or two adjacent second passages, and the included angle between two adjacent flow guiding passages is equal to the included angle between an adjacent first passage and the second passage.

[0013] Furthermore, a plurality of the first passages and a plurality of the second passages are arranged in one-to-one correspondence, and the corresponding first passage and the second passage are located in the same axial cross-section;

[0014] An auxiliary flow channel is provided on the flow guiding passage, and the auxiliary flow channel communicates with the second passage.

[0015] Furthermore, the flow guiding passage includes a horizontal through hole arranged in parallel with the drainage tube, and a drainage hole arranged at one end of the horizontal through hole away from the drainage tube;

[0016] A plurality of the drainage holes form a confluence groove.

[0017] Furthermore, the confluence groove includes grooves and protrusions arranged at intervals along the circumferential direction, and sealing rings are arranged on both sides of the confluence groove;

[0018] The drainage holes are correspondingly arranged at the positions of the grooves.

[0019] Furthermore, the grooves and the protrusions form a wavy flow assisting surface;

[0020] The distance between the protrusion and the drainage hole is smaller than the distance between the groove and the drainage hole, and a flow guiding gap is formed at the connection between the groove and the protrusion, and the flow guiding gap gradually becomes smaller in the direction towards the end of the protrusion.

[0021] Furthermore, a stepped shaft is provided at the liquid inlet of the shaft core corresponding to the first passage and the second passage;

[0022] The liquid distribution plate includes a stepped groove for the stepped shaft to be embedded, and a face bearing is provided between the opposite end faces of the stepped shaft and the stepped groove.

[0023] Furthermore, a stepped hole is provided in the inner hole at one end of the sliding sleeve located in the liquid distribution plate, and a resisting edge extends outward from the end face of the liquid distribution plate away from the liquid supply plate, and an annular space is formed between the resisting edge and the stepped surface of the stepped hole;

[0024] And a distance sensor is provided in the annular space, and the distance sensor is arranged on the resisting edge for monitoring the moving distance of the sliding sleeve.

[0025] The present invention also provides a method for using the high-speed electric spindle core cooling device as described above, including:

[0026] The liquid supply tray obtains the coolant through an external pipeline and stores the coolant in the liquid supply tray;

[0027] The coolant in the liquid supply tray is injected into the liquid distribution tray through a plurality of drainage pipes;

[0028] As the electric spindle rotates at a high speed, when the flow guiding passage is aligned with the first passage and the second passage, the sliding sleeve drives the liquid supply tray to move towards the liquid distribution tray under the driving force of the driving member. At this time, the drainage pipe generates a boosting force on the coolant in the flow guiding passage;

[0029] The liquid distribution tray uses the boosting force to distribute the coolant to a plurality of first passages and a plurality of second passages through a plurality of flow guiding passages, realizing core cooling.

[0030] The beneficial effects of the present invention are as follows: By precisely controlling the flow and distribution of the coolant, the present invention effectively solves the heat problem generated when the electric spindle operates at a high speed, improves the performance and service life of the electric spindle, and realizes the cooling and centering of the core by intermittently aligning the liquid supply and the water flow impacting the outer cylindrical surface of the core. At the same time, through the boosting effect of the drainage pipe, the flow rate of the coolant is accelerated, the liquid flow path is shortened, the cooling efficiency is further improved, the temperature rise inside the electric spindle is reduced, the performance of the electric spindle is improved, and the working life of the electric spindle is extended. Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0032] Figure 1 Is an axonometric schematic diagram of the high-speed electric spindle core cooling device in the embodiment of the present invention;

[0033] Figure 2 Is a left view of the high-speed electric spindle core cooling device in the embodiment of the present invention;

[0034] Figure 3 Is Figure 2 The cross-sectional view taken along line A-A in

[0035] Figure 4 Is Figure 2 The cross-sectional view taken along line B-B in

[0036] Figure 5 IsFigure 3 C-C cross-sectional view;

[0037] Figure 6 Schematic structural diagram of the shaft core cooling device in the embodiment of the present invention;

[0038] Figure 7 Second distribution schematic diagram of the first passage and the second passage in the embodiment of the present invention;

[0039] Figure 8 Schematic diagram of the positions of the first passage, the second passage and the flow guiding passage in the embodiment of the present invention;

[0040] Figure 9 Third distribution schematic diagram of the first passage and the second passage in the embodiment of the present invention;

[0041] Figure 10 Schematic structural diagram of the liquid distribution plate with grooves and protrusions in the embodiment of the present invention;

[0042] Figure 11 First guiding state schematic diagram of the liquid distribution plate with grooves and protrusions in the embodiment of the present invention;

[0043] Figure 12 Second guiding state schematic diagram of the liquid distribution plate with grooves and protrusions in the embodiment of the present invention.

[0044] Reference numerals: 1, shaft core; 1a, first passage; 1b, second passage; 11, stepped shaft; 2, liquid distribution plate; 23, stepped groove; 24, resisting edge; 21, flow guiding passage; 21a, horizontal through hole; 21b, drainage hole; 21c, confluence groove; c1, groove; c2, protrusion; 22, auxiliary flow channel; 3, liquid supply plate; 4, drainage pipe; 4a, sealing ring; 5, sliding sleeve; 51, stepped hole; 6, end face bearing. Detailed implementation manners

[0045] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0046] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manner.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this invention belongs. The terms used in the description of this invention are for the purpose of describing specific embodiments only and are not intended to limit the invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0048] As Figures 1 to 6 shown in the high-speed electric spindle core 1 cooling device, which includes: the core 1, a liquid distribution plate 2 arranged at the middle position of the core 1, and a liquid supply plate 3 for supplying liquid to the liquid distribution plate 2;

[0049] The core 1 has a plurality of first passages 1a and a plurality of second passages 1b, and a plurality of guiding passages 21 are provided on the liquid distribution plate 2; one end face of the liquid supply plate 3 facing the liquid distribution plate 2 is provided with a plurality of drainage tubes 4 corresponding to the guiding passages 21. One end of the drainage tube 4 is fixed on the liquid supply plate 3, and an outer cylindrical surface of the other end is provided with a sealing ring 4a and is embedded in the guiding passage 21;

[0050] A sliding sleeve 5 is arranged outside the liquid supply plate 3. The sliding sleeve 5 is fixedly connected to the liquid supply plate 3 and is slidably arranged with the liquid distribution plate 2. A driving member is arranged on the sliding sleeve 5. The driving member drives the sliding sleeve 5 to move axially and synchronously drives the liquid supply plate 3 to move towards or away from the liquid distribution plate 2, so that the drainage tube 4 makes a telescopic movement in the guiding passage 21. It should be noted that the driving member (not shown in the figure) adopted can be in the form of direct driving by a cylinder or an oil cylinder, or can also be driven by a non-contact electromagnetic drive or a permanent magnet ring motor. This driving form is a conventional structure and will not be elaborated here.

[0051] The implementation process of the preferred embodiment of this invention is that the liquid supply plate 3 obtains the coolant through an external pipeline. The coolant in the liquid supply plate 3 is injected into the liquid distribution plate 2 through a plurality of drainage tubes 4. The liquid distribution plate 2 distributes the coolant to a plurality of first passages 1a and a plurality of second passages 1b through a plurality of guiding passages 21; and the liquid outlets of the plurality of first passages 1a are located at the front end of the core 1, and the liquid outlets of the plurality of second passages 1b are located at the rear end of the core 1. The front end refers to the end for installing the tool. A liquid return plate is arranged corresponding to the two liquid outlets to recycle the coolant; as the electric spindle rotates at a high speed, the coolant in the plurality of guiding passages 21 intermittently supplies liquid to the first passages 1a and the second passages 1b to achieve cooling of the core 1. When the guiding passage 21 is aligned with the first passage 1a and the second passage 1b, the sliding sleeve 5 drives the liquid supply plate 3 to move towards the liquid distribution plate 2 under the driving force of the driving member, and the drainage tube 4 boosts the coolant in the guiding passage 21; and when the core 1 rotates to a position where the guiding passage 21 is not connected to the first passage 1a or the second passage 1b, the water flow formed by the guiding passage 21 at this time will impact the outer cylindrical surface of the core 1 to play a centering role for the core 1.

[0052] By precisely controlling the flow and distribution of the coolant, the present invention effectively solves the heat problem generated by the motorized spindle during high-speed operation, improves the performance and service life of the motorized spindle, and realizes the cooling and centering functions of the shaft core 1 by intermittently aligning the liquid supply and the water flow impacting the outer cylindrical surface of the shaft core 1. At the same time, through the boosting effect of the diversion pipe, the flow rate of the coolant is accelerated, the liquid flow path is shortened, the cooling efficiency is further improved, the temperature rise inside the motorized spindle is reduced, the performance of the motorized spindle is improved, and the working life of the motorized spindle is extended.

[0053] In a preferred embodiment of the present invention, a plurality of first passages 1a and a plurality of second passages 1b are arranged alternately in the circumferential direction, and the liquid inlets are located in different radial cross-sections; a plurality of guiding passages 21 communicating with the plurality of first passages 1a and a plurality of guiding passages 21 communicating with the plurality of second passages 1b are provided on the liquid distribution disk 2.

[0054] Due to the alternating arrangement of the first passage 1a and the second passage 1b, the coolant can more evenly cover the entire circumference of the shaft core 1, improving the cooling efficiency. The design of the liquid inlets in different radial cross-sections helps to achieve a uniform temperature distribution inside the shaft core 1, reducing the risk of local overheating. The design of the guiding passages 21 on the liquid distribution disk 2 enables the coolant to more directly contact the heat source of the shaft core 1, enhancing the heat exchange effect. As the motorized spindle rotates, the collection and distribution of the coolant by the confluence groove 21c enables intermittent alignment of the guiding passages 21 with the first passage 1a and the second passage 1b for liquid supply, realizing a dynamic cooling effect, which is particularly important for a high-speed rotating motorized spindle.

[0055] In the second preferred solution of the present invention, the distribution of the first passage 1a and the second passage 1b is set. Specifically, as Figures 7 - 8 shown, the liquid inlets of a plurality of first passages 1a and a plurality of second passages 1b are located in the same radial cross-section and are arranged alternately and evenly in the circumferential direction; the coolant can more evenly cover the entire circumference of the shaft core 1, and a plurality of guiding passages 21 communicate with a plurality of first passages 1a and a plurality of second passages 1b; and the included angle between two adjacent guiding passages 21 is equal to the included angle between two adjacent first passages 1a or two adjacent second passages 1b. When the shaft core 1 rotates, the first passage 1a or the second passage 1b can be intermittently aligned with the first drainage hole 21b of the guiding passage 21 to quickly pass the liquid medium through the confluence groove 21c into the cooling circuit of the shaft core 1, accelerating the flow rate of the cooling liquid. In another setting form, the included angle between two adjacent guiding passages 21 is equal to the included angle between the adjacent first passage 1a and the second passage 1b. By optimizing the flow and distribution of the coolant, the contact between the coolant and the shaft core 1 is made more uniform, improving the heat exchange efficiency.

[0056] As the third preferred mode of the present invention, as Figure 9As shown, a plurality of first channels 1a and a plurality of second channels 1b are arranged in one-to-one correspondence, and the corresponding first channel 1a and second channel 1b are located in the same axial cross-section; an auxiliary flow channel 22 is provided on the flow guiding channel 21, and the auxiliary flow channel 22 is communicated with the second channel 1b. Through the design of the auxiliary flow channel 22, the flow path of the coolant can be increased. This design helps to realize the temperature change and speed change of the cooling water in a shorter time, shorten the heat reaction time, and improve the cooling efficiency.

[0057] In a preferred embodiment of the present invention, the flow guiding channel 21 includes a horizontal through hole 21a arranged in parallel with the drainage pipe 4, and a drainage hole 21b provided at one end of the horizontal through hole 21a away from the drainage pipe 4; a plurality of drainage holes 21b form a confluence groove 21c.

[0058] A plurality of drainage holes 21b form a confluence groove 21c, which helps to concentrate and distribute the coolant, so that the coolant can be more evenly distributed to different parts of the motorized spindle, achieving a more effective cooling effect.

[0059] On the basis of the above embodiments, as Figure 9 and Figure 10 shown, the confluence groove 21c includes grooves c1 and protrusions c2 arranged at intervals in the circumferential direction, and sealing rings 4a are provided on both sides of the confluence groove 21c; to prevent coolant leakage, ensure the stability and reliability of the cooling system, and the drainage holes 21b are correspondingly arranged at the positions of the grooves c1.

[0060] When the cooling medium enters the corresponding first confluence groove 21c and second confluence groove 21c through the plurality of drainage holes 21b of the liquid distribution plate 2, as the shaft core 1 continuously rotates, when the drainage hole 21b at the groove c1 corresponds to the first channel 1a or the second channel 1b, the cooling medium quickly passes through the first channel 1a or the second channel 1b, accelerating the flow rate of the liquid.

[0061] Preferably, as Figures 10 - 12 shown, the grooves c1 and the protrusions c2 form a wavy flow assisting surface; the continuous grooves c1 and the protrusions c2 form a wavy flow assisting surface, which can increase the turbulence of the coolant entering the first channel 1a or the second channel 1b, reduce the dead zone in the coolant flow, and ensure that the coolant can reach the heating area more effectively. The distance between the protrusion c2 and the drainage hole 21b is smaller than the distance between the groove c1 and the drainage hole 21b, and a flow guiding gap is formed at the connection of the groove c1 and the protrusion c2, and the flow guiding gap gradually becomes smaller in the direction towards the end of the protrusion c2.

[0062] When the first passage 1a or the second passage 1b rotates to the position of the groove c1, at this time, the drainage hole 21b is aligned with the first passage 1a or the second passage 1b, and a large amount of cooling medium is introduced into the first passage 1a or the second passage 1b through the groove c1, increasing the flow rate of the cooling medium. When the shaft core 1 rotates to make the first passage 1a or the second passage 1b rotate to the position of the protrusion c2, at this time, the drainage hole 21b corresponds to the outer cylindrical surface of the shaft core 1, and the cooling medium flowing out of the drainage hole 21b is quickly sent into the first passage 1a or the second passage 1b through the diversion gap, thereby accelerating the flow rate of the cooling medium. By increasing the flow rate and velocity, the flow characteristics of the cooling medium are optimized, the convective heat transfer intensity in the flow channel can be significantly enhanced, and the temperature uniformity of the microchannel heat sink can be effectively improved, thereby improving the performance and working life of the motorized spindle.

[0063] In the present invention, during the liquid separation process of the liquid separation disc 2, the liquid supply disc 3 will relatively move axially, and the coolant in the diversion passage 21 is boosted through the drainage pipe 4. In order to prevent the liquid separation disc 2 from axially moving due to the influence of the boosting force, preferably, the shaft core 1 is provided with a stepped shaft 11 at the liquid inlet of the first passage 1a and the second passage 1b; the liquid separation disc 2 includes a stepped groove 23 for the stepped shaft 11 to be embedded, and an end face bearing 6 is provided between the relative end faces of the stepped shaft 11 and the stepped groove 23.

[0064] Through the setting of the stepped shaft 11, an accurate positioning function is provided, ensuring the position accuracy of the liquid separation disc 2 on the shaft core 1, thereby ensuring the alignment accuracy of the diversion passage 21 with the first passage 1a and the second passage 1b; and through the limitation of the end face bearing 6, the liquid separation disc 2 is prevented from performing circular motion due to the rotation of the shaft core 1, effectively ensuring the reliability of the position of the liquid separation disc 2, and reducing the decrease in cooling efficiency and potential mechanical failures caused by position changes.

[0065] In a preferred embodiment of the present invention, the sliding sleeve 5 is provided with a stepped hole 51 in the inner hole at one end of the liquid separation disc 2, and a resisting edge 24 extends outward from the end face of the liquid separation disc 2 away from the liquid supply disc 3, and an annular space is formed between the resisting edge 24 and the stepped surface of the stepped hole 51; and a distance sensor is provided in the annular space, and the distance sensor is arranged on the resisting edge 24 for monitoring the moving distance of the sliding sleeve 5.

[0066] Through the setting of the distance sensor (not shown in the figure), the position of the liquid supply disc 3 is monitored in real time, and the position of the drainage pipe 4 in the diversion channel is further controlled to prevent the drainage pipe 4 from detaching from the diversion channel, ensuring the drainage reliability of the drainage pipe 4, enabling the coolant to flow smoothly from the liquid supply disc 3 to the liquid separation disc 2, and contributing to maintaining the continuity and stability of the cooling system.

[0067] The present invention also provides a use method of a cooling device for a high-speed motorized spindle shaft core 1, including:

[0068] The liquid supply tray 3 obtains the coolant through an external pipeline and stores the coolant in the liquid supply tray 3;

[0069] The coolant in the liquid supply tray 3 is injected into the liquid distribution tray 2 through a plurality of drainage pipes 4;

[0070] As the electric spindle rotates at a high speed, when the fluid guiding passage 21 is aligned with the first passage 1a and the second passage 1b, under the driving force of the driving member, the sliding sleeve 5 drives the liquid supply tray 3 to move towards the liquid distribution tray 2. At this time, the drainage pipe 4 generates a boosting force on the coolant in the fluid guiding passage 21;

[0071] The liquid distribution tray 2 uses the boosting force to distribute the coolant to a plurality of first passages 1a and a plurality of second passages 1b through a plurality of fluid guiding passages 21, thereby cooling the shaft core 1.

[0072] The above steps ensure that the coolant can be effectively transmitted from the liquid supply tray 3 to the liquid distribution tray 2, and the coolant is distributed to the first passage 1a and the second passage 1b of the shaft core 1 through the boosting force, so as to cool the shaft core 1. This design helps to improve the cooling efficiency and stability of the electric spindle, thereby improving the performance and service life of the electric spindle.

[0073] Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-speed electric spindle core cooling device, characterized in that, Comprising: A shaft core, a liquid distribution plate disposed at the middle position of the shaft core, and a liquid supply plate for supplying liquid to the liquid distribution plate; The shaft core has a plurality of first passages and a plurality of second passages, and a plurality of guide flow passages are provided on the liquid distribution plate; One end face of the liquid supply plate facing the liquid distribution plate is provided with a plurality of drainage tubes corresponding to the guide flow passages. One end of the drainage tube is fixed on the liquid supply plate, and a sealing ring is provided on the outer cylindrical surface of the other end and is embedded in the guide flow passage; A sliding sleeve is provided outside the liquid supply plate. The sliding sleeve is fixedly connected to the liquid supply plate and is slidably disposed with the liquid distribution plate. A driving member is provided on the sliding sleeve. As the electric spindle rotates at a high speed, the coolant in the plurality of guide flow passages intermittently supplies liquid to the first passage and the second passage. When the guide flow passage is aligned with the first passage and the second passage, the driving member drives the sliding sleeve to move axially, and synchronously drives the liquid supply plate to move towards or away from the liquid distribution plate, so that the drainage tube makes a telescopic movement in the guide flow passage; The guide flow passage includes a horizontal through hole arranged in parallel with the drainage tube, and a drainage hole arranged at one end of the horizontal through hole away from the drainage tube; a plurality of the drainage holes form a confluence groove; The confluence groove includes grooves and protrusions arranged at intervals in the circumferential direction. The drainage holes are all correspondingly arranged at the positions of the grooves, and the grooves and the protrusions form a wavy flow assisting surface.

2. The high-speed electric spindle core cooling device according to claim 1, wherein, The plurality of first passages and the plurality of second passages are arranged alternately in the circumferential direction, and the liquid inlets are located in different radial cross-sections; The liquid distribution plate is provided with a plurality of the guide flow passages communicated with the plurality of first passages and a plurality of the guide flow passages communicated with the plurality of second passages.

3. The high-speed motorized spindle core cooling device according to claim 1, characterized in that, The liquid inlets of the plurality of first passages and the plurality of second passages are located in the same radial cross-section and are evenly distributed and arranged alternately in the circumferential direction; The plurality of guide flow passages communicate the plurality of first passages and the plurality of second passages; And the included angle between two adjacent guide flow passages is equal to the included angle between two adjacent first passages or two second passages, and the included angle between two adjacent guide flow passages is equal to the included angle between the adjacent first passage and the second passage.

4. The high-speed electric spindle core cooling device according to claim 1, characterized in that, The plurality of first passages and the plurality of second passages are arranged in one-to-one correspondence, and the corresponding first passage and the second passage are located in the same axial cross-section; An auxiliary flow channel is provided on the guide flow passage, and the auxiliary flow channel is communicated with the second passage.

5. The high-speed electric spindle core cooling device according to claim 1, characterized in that, Sealing rings are arranged on both sides of the confluence groove.

6. The high-speed electric spindle core cooling device according to claim 1, characterized in that, The distance between the protrusion and the drainage hole is smaller than the distance between the groove and the drainage hole, and a diversion gap is formed at the connection between the groove and the protrusion, and the diversion gap gradually becomes smaller in the direction towards the end of the protrusion.

7. The high-speed electric spindle core cooling device according to claim 1, characterized in that, Step shafts are provided at the liquid inlets of the shaft core corresponding to the first passage and the second passage; The liquid distribution plate includes a step groove for the step shaft to be embedded, and an end face bearing is provided between the opposite end faces of the step shaft and the step groove.

8. The high-speed electric spindle core cooling device according to claim 1, wherein, The sliding sleeve is provided with a stepped hole in the inner hole at one end of the liquid distribution plate. The end face of the liquid distribution plate away from the liquid supply plate extends outward to form a resisting edge, and an annular space is formed between the resisting edge and the stepped surface of the stepped hole. A distance sensor is arranged in the annular space. The distance sensor is arranged on the resisting edge and is used for monitoring the moving distance of the sliding sleeve.

9. A method for using the high-speed electric spindle core cooling device as described in claim 1, characterized in that, It includes: The liquid supply plate obtains the coolant through an external pipeline and stores the coolant in the liquid supply plate. The coolant in the liquid supply plate is injected into the liquid distribution plate through a plurality of drainage pipes. As the electric spindle rotates at a high speed, when the flow guiding passage is aligned with the first passage and the second passage, the sliding sleeve drives the liquid supply plate to move towards the liquid distribution plate under the driving force of the driving member. At this time, the drainage pipes generate a boosting force on the coolant in the flow guiding passage. The liquid distribution plate uses the boosting force to distribute the coolant to a plurality of first passages and a plurality of second passages through a plurality of flow guiding passages, realizing axial core cooling.

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