High-speed motorized spindle core cooling device and using method thereof

Abstract

The invention relates to the technical field of motorized spindle cooling, in particular to a high-speed motorized spindle core cooling device and a using method thereof.The high-speed motorized spindle core cooling device comprises a spindle core, a liquid distribution disc and a liquid supply disc used for supplying liquid to the liquid distribution disc; the shaft core is provided with a plurality of first passages and a plurality of second passages, and the liquid distribution disc is provided with a plurality of flow guide passages; the liquid supply disc is provided with a plurality of drainage pipes corresponding to the flow guide channels, one ends of the drainage pipes are fixed to the liquid supply disc, and sealing rings are arranged on the outer cylindrical faces of the other ends of the drainage pipes and embedded into the flow guide channels. A sliding sleeve is arranged on the outer side of the liquid supply disc, the sliding sleeve is fixedly connected with the liquid supply disc, the sliding sleeve and the liquid distribution disc are arranged in a sliding mode, a driving piece is arranged on the sliding sleeve, and the driving piece drives the sliding sleeve to drive the liquid supply disc to move in the direction close to or away from the liquid distribution disc, so that the drainage pipe does telescopic motion in the flow guide channel, and the flowing speed of cooling liquid is increased; the cooling efficiency is improved, the temperature rise in the motorized spindle is reduced, the performance of the motorized spindle is improved, and the service life of the motorized spindle is prolonged.

Description

Technical Field

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

[0002] The electric spindle is a technology that integrates the machine tool spindle and the spindle motor in the field of CNC machine tools. The electric spindle drives the tool to rotate and process the workpiece. However, during the operation of the electric spindle, the motor and bearings will generate a lot of heat. If the generated heat is not discharged in time, a complex temperature field will be formed inside the electric spindle, causing a sharp rise in temperature and severe thermal deformation, which will affect the service life, precision 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 use method thereof, which effectively solves the problems in the background technology.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a high-speed electric spindle shaft core cooling device, comprising: a shaft core and a liquid separation plate arranged at a middle position of the shaft core, and a liquid supply plate for supplying liquid to the liquid separation plate; The shaft core is provided with a plurality of first passages and a plurality of second passages, and the liquid separation disk is provided with a plurality of flow guide passages; A plurality of drainage tubes corresponding to the flow guide passage are arranged on one end surface of the liquid supply plate facing the liquid separation plate, one end of the drainage tube is fixed on the liquid supply plate, and a sealing ring is arranged on the outer cylindrical surface of the other end and is embedded in the flow guide passage; A sliding sleeve is provided on the outer side of the liquid supply disk, the sliding sleeve is fixedly connected to the liquid supply disk and is slidably arranged with the liquid separation disk, and a driving member is provided on the sliding sleeve, the driving member drives the sliding sleeve to move axially and simultaneously drives the liquid supply disk to move toward or away from the liquid separation disk, so that the drainage tube can perform telescopic movement in the diversion passage.

[0005] Further, a plurality of the first passages and a plurality of the second passages are staggered in the circumferential direction, and the liquid inlets are located in different radial cross sections; The liquid separation disk is provided with a plurality of the flow guide passages communicating with the plurality of the first passages, and a plurality of the flow guide passages communicating with the plurality of the second passages.

[0006] Furthermore, the liquid inlets of the plurality of the first passages and the plurality of the second passages are located in the same radial cross section and are evenly and staggeredly arranged along the circumferential direction; The plurality of diversion passages connect the plurality of the first passages and the plurality of the second passages; The included angle between two adjacent flow guide 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 guide passages is equal to the included angle between the adjacent first passage and the second passage.

[0007] Further, a plurality of the first passages and a plurality of the second passages are arranged in one-to-one correspondence, and the corresponding first passages and the second passages are located in the same axial cross section; An auxiliary flow channel is provided on the flow guide passage, and the auxiliary flow channel is communicated with the second passage.

[0008] Further, the diversion 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; The plurality of drainage holes form a confluence groove.

[0009] 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; The drainage holes are all arranged correspondingly at the positions of the grooves.

[0010] Furthermore, the groove and the protrusion form a wave-shaped flow-aiding surface; The distance between the protrusion and the drainage hole is smaller than the distance between the groove and the drainage hole, and a drainage gap is formed at the connection between the groove and the protrusion, and the drainage gap gradually becomes smaller toward the end of the protrusion.

[0011] Furthermore, the shaft core is provided with a stepped shaft at the liquid inlet corresponding to the first passage and the second passage; The liquid separation plate comprises a step groove for the step shaft to be embedded in, and an end face bearing is arranged between the step shaft and the opposite end faces of the step groove.

[0012] Furthermore, the inner hole of the sliding sleeve at one end of the liquid separation plate is provided with a step hole, and the end surface of the liquid separation plate away from the liquid supply plate extends outwardly with a stop edge, and the stop edge and the step surface of the step hole form an annular space; A distance sensor is provided in the annular space. The distance sensor is arranged on the stop edge and is used to monitor the moving distance of the sliding sleeve.

[0013] The present invention also provides a method for using the high-speed electric spindle core cooling device as described above, comprising: The liquid supply tray obtains the coolant through an external pipeline and stores the coolant in the liquid supply tray; The coolant in the liquid supply tray is injected into the liquid distribution tray through a plurality of drainage tubes; As the electric spindle rotates at high speed, when the guide passage is aligned with the first passage and the second passage, the sliding sleeve drives the liquid supply plate toward the liquid separation plate under the driving force of the driving member, and at this time, the drainage pipe generates a boosting force on the coolant in the guide passage; The liquid distribution plate utilizes the boosting force to distribute the coolant to the multiple first passages and the multiple second passages through the multiple flow guide passages, so as to realize the cooling of the shaft core.

[0014] The beneficial effects of the present invention are as follows: the present invention effectively solves the problem of heat generated by the electric spindle when it runs at high speed by precisely controlling the flow and distribution of the coolant, thereby improving the performance and service life of the electric spindle, and by intermittently aligning the liquid supply and the water flow to impact the outer cylindrical surface of the shaft core, the cooling and centering effect of the shaft core is achieved. At the same time, through the boosting effect of the guide tube, the flow speed of the coolant is accelerated and the flow path of the liquid is shortened, thereby further improving the cooling efficiency, reducing the temperature rise inside the electric spindle, improving the performance of the electric spindle, and extending the service life of the electric spindle. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is an isometric schematic diagram of a high-speed electric spindle core cooling device in an embodiment of the present invention; Figure 2 It is a left side view of the high-speed electric spindle core cooling device in the embodiment of the present invention; Figure 3 for Figure 2 AA section view in; Figure 4 for Figure 2 BB cross-section view in; Figure 5 for Figure 3 CC section view in; Figure 6 It is a structural schematic diagram of a shaft core cooling device in an embodiment of the present invention; Figure 7 is a schematic diagram of a second distribution of the first passage and the second passage in an embodiment of the present invention; Figure 8 Schematic diagram of the positions of the first passage, the second passage and the flow guide passage in an embodiment of the present invention; Fig. 9 Schematic diagram of a third distribution of the first passage and the second passage in an embodiment of the present invention; Fig.10 Schematic diagram of the structure of a liquid separation plate with grooves and protrusions in an embodiment of the present invention; Fig.11 This is a schematic diagram of a first flow guiding state of a liquid separation plate having grooves and protrusions in an embodiment of the present invention; Fig.12 Schematic diagram of a second flow guiding state of a liquid separation plate with grooves and protrusions in an embodiment of the present invention.

[0017] Figure numerals: 1, shaft core; 1a, first passage; 1b, second passage; 11, stepped shaft; 2, liquid separation plate; 23, stepped groove; 24, stop edge; 21, flow guide 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 tube; 4a, sealing ring; 5, sliding sleeve; 51, stepped hole; 6, end face bearing. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0021] like Figures 1 to 6 The cooling device for the shaft core 1 of the high-speed electric spindle shown comprises: the shaft core 1, a liquid separation plate 2 arranged at the middle position of the shaft core 1, and a liquid supply plate 3 for supplying liquid to the liquid separation plate 2; The shaft core 1 is provided with a plurality of first passages 1a and a plurality of second passages 1b, and the liquid separation plate 2 is provided with a plurality of flow guide passages 21; a plurality of drainage tubes 4 corresponding to the flow guide passages 21 are provided on one end surface of the liquid supply plate 3 facing the liquid separation plate 2, one end of the drainage tube 4 is fixed on the liquid supply plate 3, and a sealing ring 4a is provided on the outer cylindrical surface of the other end and is embedded in the flow guide passage 21; A sliding sleeve 5 is provided on the outer side of 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 separation plate 2. A driving member is provided on the sliding sleeve 5, and the driving member drives the sliding sleeve 5 to move axially, and simultaneously drives the liquid supply plate 3 to move toward or away from the liquid separation plate 2, so that the drainage tube 4 can perform telescopic movement in the diversion passage 21. It should be noted that the driving member (not shown in the figure) can be directly driven by a cylinder or an oil cylinder, or can be driven by a non-contact electromagnetic drive or a permanent magnet ring motor. This driving form is an existing structure and will not be repeated here.

[0022] The implementation process of the preferred embodiment of the present 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 separation plate 2 through multiple drainage tubes 4, and the liquid separation plate 2 distributes the coolant to multiple first passages 1a and multiple second passages 1b through multiple diversion passages 21; the liquid outlets of the multiple first passages 1a are located at the front end of the shaft core 1, and the liquid outlets of the multiple second passages 1b are located at the rear end of the shaft core 1, the front end refers to the end for installing the tool, and a return liquid plate is set corresponding to the two liquid outlets to recycle the coolant; as the electric spindle rotates at high speed, The coolant in the multiple guide passages 21 intermittently aligns and supplies liquid to the first passage 1a and the second passage 1b to achieve cooling of the shaft core 1. When the guide passage 21 is aligned with the first passage 1a and the second passage 1b, the sliding sleeve 5 drives the liquid supply disk 3 toward the liquid separation disk 2 under the driving force of the driving member, and the drainage tube 4 boosts the coolant in the guide passage 21; and when the shaft core 1 rotates to the point where the guide passage 21 is no longer connected to the first passage 1a or the second passage 1b, the water flow formed by the guide passage 21 will impact the outer cylindrical surface of the shaft core 1, thereby centering the shaft core 1.

[0023] The present invention effectively solves the problem of heat generated by the electric spindle when it runs at high speed by precisely controlling the flow and distribution of the coolant, thereby improving the performance and service life of the electric spindle. The present invention also achieves cooling and centering of the shaft core 1 by intermittently aligning the liquid supply and the water flow to impact the outer cylindrical surface of the shaft core 1. At the same time, the flow rate of the coolant is accelerated and the flow path of the liquid is shortened through the boosting effect of the guide tube, thereby further improving the cooling efficiency, reducing the temperature rise inside the electric spindle, improving the performance of the electric spindle, and extending the service life of the electric spindle.

[0024] In a preferred embodiment of the present invention, multiple first passages 1a and multiple second passages 1b are staggered in the circumferential direction, and the liquid inlets are located in different radial cross-sections; the liquid separation plate 2 is provided with multiple flow guide passages 21 connected to the multiple first passages 1a, and multiple flow guide passages 21 connected to the multiple second passages 1b.

[0025] Due to the staggered arrangement of the first passage 1a and the second passage 1b, the coolant can cover the entire circumference of the shaft core 1 more evenly, improving the cooling efficiency, and the design of the liquid inlet with different radial sections helps to achieve uniform temperature distribution inside the shaft core 1, reducing the risk of local overheating, and the design of the guide passage 21 on the liquid separation plate 2 allows the coolant to contact the heat source of the shaft core 1 more directly, enhancing the heat exchange effect. As the electric spindle rotates, the confluence groove 21c concentrates and distributes the coolant, so that the guide passage 21 is intermittently aligned with the first passage 1a and the second passage 1b to supply liquid, achieving a dynamic cooling effect, which is particularly important for high-speed electric spindles.

[0026] In a second preferred embodiment of the present invention, the distribution of the first passage 1a and the second passage 1b is set, specifically, as follows: Figure 7-8 As shown, the liquid inlets of the multiple first passages 1a and the multiple second passages 1b are located in the same radial section and are evenly and staggeredly arranged along the circumferential direction; so that the coolant can more evenly cover the entire circumference of the shaft core 1, and the multiple flow guide passages 21 connect the multiple first passages 1a and the multiple second passages 1b; and the angle between two adjacent flow guide passages 21 is equal to the angle between two adjacent first passages 1a or two 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 flow guide passage 21, so that the liquid medium quickly passes through the confluence groove 21c into the cooling circuit of the shaft core 1, thereby accelerating the flow speed of the cooling liquid. In another arrangement form, the angle between two adjacent flow guide passages 21 is equal to the angle between the adjacent first passages 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, and the heat exchange efficiency is improved.

[0027] As a third preferred embodiment of the present invention, Fig. 9 As shown, a plurality of first passages 1a and a plurality of second passages 1b are arranged one by one, and the corresponding first passages 1a and second passages 1b are located in the same axial section; an auxiliary flow channel 22 is provided on the flow guide passage 21, and the auxiliary flow channel 22 is connected to the second passage 1b. Through the design of the auxiliary flow channel 22, the flow path of the coolant can be increased, and this design helps to achieve temperature and speed changes of the cooling water in a shorter time, shorten the thermal reaction time, and improve the cooling efficiency.

[0028] In a preferred embodiment of the present invention, the diversion passage 21 includes a horizontal through hole 21a arranged parallel to the drainage tube 4, and a drainage hole 21b arranged at one end of the horizontal through hole 21a away from the drainage tube 4; the plurality of drainage holes 21b form a confluence groove 21c.

[0029] The plurality of drainage holes 21 b form a confluence groove 21 c, which helps to concentrate and distribute the coolant, so that the coolant can be more evenly distributed to different parts of the electric spindle, thereby achieving a more effective cooling effect.

[0030] Based on the above embodiments, Fig. 9 and Fig.10 As shown, the confluence groove 21c includes grooves c1 and protrusions c2 arranged at intervals along the circumferential direction, and sealing rings 4a are arranged on both sides of the confluence groove 21c to prevent coolant leakage and ensure the stability and reliability of the cooling system. The drainage holes 21b are all arranged corresponding to the groove c1 position.

[0031] When the cooling medium enters the corresponding first confluence groove 21c and the second confluence groove 21c through the multiple drainage holes 21b of the liquid separation plate 2, as the shaft core 1 rotates continuously, when the drainage hole 21b at the groove c1 corresponds to the first passage 1a or the second passage 1b, the cooling medium quickly passes through the first passage 1a or the second passage 1b, thereby accelerating the flow rate of the liquid.

[0032] Preferably, if Figure 10-12 As shown, the groove c1 and the protrusion c2 form a wavy flow-aiding surface; the wavy flow-aiding surface formed by the continuous groove c1 and the protrusion c2 can increase the turbulence of the coolant entering the first passage 1a or the second passage 1b, reduce the dead zone in the flow of the coolant, 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 between the groove c1 and the protrusion c2, and the flow-guiding gap gradually becomes smaller toward the end of the protrusion c2.

[0033] When the first passage 1a or the second passage 1b rotates to the groove c1 position, 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 protrusion c2 position, 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 guide gap, thereby accelerating the flow rate of the cooling medium. By increasing the flow rate and flow rate, the flow characteristics of the cooling medium are optimized, the convective heat exchange intensity in the flow channel can be significantly enhanced, and the temperature uniformity of the microchannel heat sink is effectively improved, thereby improving the performance and service life of the electric spindle.

[0034] In the present invention, during the liquid separation process of the liquid separation plate 2, the liquid supply plate 3 will produce axial movement relative to the liquid separation plate 2, and the coolant in the diversion passage 21 will be boosted through the drainage tube 4. In order to prevent the liquid separation plate 2 from axial movement due to the boosting force, preferably, the shaft core 1 is provided with a step shaft 11 at the liquid inlet corresponding to the first passage 1a and the second passage 1b; the liquid separation plate 2 includes a step groove 23 for the step shaft 11 to be embedded, and an end face bearing 6 is provided between the step shaft 11 and the relative end faces of the step groove 23.

[0035] The step shaft 11 is provided to provide precise positioning, thereby ensuring the position accuracy of the separator plate 2 on the shaft core 1, thereby ensuring the alignment accuracy of the guide passage 21 with the first passage 1a and the second passage 1b; and through the limitation of the end bearing 6, the separator plate 2 is prevented from being affected by the rotation of the shaft core 1 and making circular motion, thereby effectively ensuring the reliability of the position of the separator plate 2 and reducing the decrease in cooling efficiency and potential mechanical failures caused by position changes.

[0036] In a preferred embodiment of the present invention, a step hole 51 is provided in the inner hole of the sliding sleeve 5 located at one end of the liquid separation plate 2, and a stop edge 24 is extended outward from the end surface of the liquid separation plate 2 away from the liquid supply plate 3, and the stop edge 24 and the step surface of the step hole 51 form an annular space; and a distance sensor is provided in the annular space, and the distance sensor is arranged on the stop edge 24, for monitoring the moving distance of the sliding sleeve 5.

[0037] By setting a distance sensor (not shown in the figure), the position of the liquid supply plate 3 is monitored in real time, and the position of the drainage tube 4 in the diversion channel is further controlled to prevent the drainage tube 4 from detaching from the diversion channel, thereby ensuring the drainage reliability of the drainage tube 4 and allowing the coolant to flow smoothly from the liquid supply plate 3 to the liquid separation plate 2, which helps to maintain the continuity and stability of the cooling system.

[0038] The present invention also provides a method for using the high-speed electric spindle core 1 cooling device, comprising: The liquid supply tray 3 obtains the coolant through an external pipeline and stores the coolant in the liquid supply tray 3; The coolant in the liquid supply plate 3 is injected into the liquid separation plate 2 through a plurality of drainage pipes 4; As the electric spindle rotates at high speed, when the guide passage 21 is aligned with the first passage 1a and the second passage 1b, the sliding sleeve 5 drives the liquid supply plate 3 toward the liquid separation plate 2 under the driving force of the driving member, and the drainage tube 4 generates a boosting force on the coolant in the guide passage 21; The liquid distribution plate 2 utilizes the boosting force to distribute the coolant to the multiple first passages 1 a and the multiple second passages 1 b through the multiple flow guide passages 21 , thereby cooling the shaft core 1 .

[0039] The above steps ensure that the coolant can be effectively transferred from the liquid supply plate 3 to the liquid distribution plate 2, and the coolant is distributed to the first passage 1a and the second passage 1b of the shaft core 1 through the thrust force to achieve cooling of 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.

[0040] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A high-speed electric spindle core cooling device, characterized in that: include: An axis core, a liquid separation plate arranged at a middle position of the axis core, and a liquid supply plate for supplying liquid to the liquid separation plate; The shaft core is provided with a plurality of first passages and a plurality of second passages, and the liquid separation disk is provided with a plurality of flow guide passages; A plurality of drainage tubes corresponding to the flow guide passage are arranged on one end surface of the liquid supply plate facing the liquid separation plate, one end of the drainage tube is fixed on the liquid supply plate, and a sealing ring is arranged on the outer cylindrical surface of the other end and is embedded in the flow guide passage; A sliding sleeve is provided on the outer side of the liquid supply disk, the sliding sleeve is fixedly connected to the liquid supply disk and is slidably arranged with the liquid separation disk, and a driving member is provided on the sliding sleeve, the driving member drives the sliding sleeve to move axially and simultaneously drives the liquid supply disk to move toward or away from the liquid separation disk, so that the drainage tube can perform telescopic movement in the diversion passage.

2. The high-speed electric spindle core cooling device according to claim 1 is characterized in that: A plurality of the first passages and a plurality of the second passages are staggered in the circumferential direction, and the liquid inlets are located in different radial cross sections; The liquid separation disk is provided with a plurality of the flow guide passages communicating with the plurality of the first passages, and a plurality of the flow guide passages communicating with the plurality of the second passages.

3. The high-speed electric spindle core cooling device according to claim 1 is characterized in that: The liquid inlets of the plurality of the first passages and the plurality of the second passages are located in the same radial cross section and are evenly and staggeredly arranged along the circumferential direction; The plurality of diversion passages connect the plurality of the first passages and the plurality of the second passages; The included angle between two adjacent flow guide 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 guide 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: A plurality of the first passages and a plurality of the second passages are arranged in one-to-one correspondence, and the corresponding first passages and the second passages are located in the same axial cross section; An auxiliary flow channel is provided on the flow guide passage, and the auxiliary flow channel is communicated with the second passage.

5. The high-speed electric spindle core cooling device according to any one of claims 1 to 4, characterized in that: The diversion passage comprises 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; The plurality of drainage holes form a confluence groove.

6. The high-speed electric spindle core cooling device according to claim 5, characterized in that: 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; The drainage holes are all arranged correspondingly at the positions of the grooves.

7. The high-speed electric spindle core cooling device according to claim 6, characterized in that: The groove and the protrusion form a wave-shaped flow-aiding surface; The distance between the protrusion and the drainage hole is smaller than the distance between the groove and the drainage hole, and a drainage gap is formed at the connection between the groove and the protrusion, and the drainage gap gradually becomes smaller toward the end of the protrusion.

8. The high-speed electric spindle core cooling device according to claim 1, characterized in that: The shaft core is provided with a stepped shaft at the liquid inlet of the first passage and the second passage corresponding to the first passage; The liquid separation plate comprises a step groove for the step shaft to be embedded in, and an end face bearing is arranged between the step shaft and the opposite end faces of the step groove.

9. The high-speed electric spindle core cooling device according to claim 1, characterized in that: The sliding sleeve is located at one end of the liquid separation plate and has a stepped hole in its inner hole. The liquid separation plate extends outwardly from the end surface away from the liquid supply plate, and the resisting edge and the stepped surface of the stepped hole form an annular space. A distance sensor is provided in the annular space. The distance sensor is arranged on the stop edge and is used to monitor the moving distance of the sliding sleeve.

10. A method for using the high-speed electric spindle core cooling device as claimed in claim 1, characterized in that: include: The liquid supply tray obtains the coolant through an external pipeline and stores the coolant in the liquid supply tray; The coolant in the liquid supply tray is injected into the liquid distribution tray through a plurality of drainage tubes; As the electric spindle rotates at high speed, when the guide passage is aligned with the first passage and the second passage, the sliding sleeve drives the liquid supply plate toward the liquid separation plate under the driving force of the driving member, and at this time, the drainage pipe generates a boosting force on the coolant in the guide passage; The liquid distribution plate utilizes the boosting force to distribute the coolant to the multiple first passages and the multiple second passages through the multiple flow guide passages, so as to realize the cooling of the shaft core.

Images