A spindle cooling device and an electric spindle

Abstract

The application provides a main shaft cooling device and an electric main shaft, wherein the main shaft cooling device comprises a sleeve body and a motor cooling sleeve, the motor cooling sleeve is provided with a first cooling flow channel, the sleeve body is provided with a second cooling flow channel, a third cooling flow channel and a liquid inlet, one end of the second cooling flow channel and the third cooling flow channel is connected and communicated with the liquid inlet, the second cooling flow channel is communicated with the first cooling flow channel, so that the cooling liquid is introduced into the first cooling flow channel, and the first cooling flow channel cools the motor cooling sleeve, the sleeve body is further provided with a liquid return flow channel, the liquid return flow channel is communicated with the first cooling flow channel, so that the cooling liquid in the first cooling flow channel is introduced out, the sleeve body is provided with a nozzle for spraying the cooling liquid to the tool at the front end of the main shaft, and the third cooling flow channel is communicated with the nozzle, so that the cooling liquid is introduced into the nozzle. According to the technical scheme of the application, one end of the second cooling flow channel and the third cooling flow channel is connected in parallel, and the cooling efficiency can be improved under the same pressure.

Description

Technical Field

[0001] This invention belongs to the field of electric spindle technology, specifically relating to a spindle cooling device and an electric spindle. Background Technology

[0002] An electric spindle, also known as HVCT, is a new technology in the field of CNC machine tools that integrates the machine tool spindle and the spindle motor.

[0003] Currently, spindles are generally equipped with annular jet cooling channels and motor cooling channels. The annular jet cooling channels are used to cool the cutting tool at the front end of the spindle. The motor cooling channels cool the motor and bearings and other heat-generating components on the spindle. The annular jet cooling channels and motor cooling channels directly affect the overall heat generation of the spindle and the cooling effect during tool machining.

[0004] Patent CN110695759A discloses a spindle cooling device with a ring spray. This structure improves the cooling efficiency of the spindle by adding a partial flange to the water-cooling inner sleeve and thus prioritizing cooling. This structure changes the cooling method of the spindle by adding an external structure of the cooling component. This method increases the difficulty of processing and assembly, making it difficult to control the assembly accuracy within a reasonable range, and thus it cannot be promoted and applied on a large scale.

[0005] Patent CN204053633U discloses a machine tool spindle tool cooling device. This structure forms an airtight groove between the front cover and the locking nut to prevent external cutting fluid from entering the bearing, thus changing the tool cooling method from a single circumferential spray angle. However, since the cooling structure at the spindle heat source acts separately, it does not significantly improve the efficiency of cooling both the overall spindle temperature and the machining tool, indicating limited optimization.

[0006] The aforementioned annular jet cooling channel is typically a single axial channel, exiting from the front end of the spindle to achieve real-time cooling of the cutting tool and workpiece during machining. The motor cooling channel is usually multiple channels with diverse distribution patterns, primarily cooling the temperature field of the spindle bearings and corresponding positions of the motor. In conventional channel designs, more attention is usually paid to the individual roles of each channel, while their combined effect is often overlooked, resulting in the utilization of both channels not being maximized and leaving room for improvement in spindle cooling efficiency. Summary of the Invention

[0007] Therefore, the present invention provides a spindle cooling device and an electric spindle, and the main technical problem to be solved is: how to improve the cooling efficiency of the spindle.

[0008] To solve the above problems, the present invention provides a spindle cooling device, which includes a sleeve and a motor cooling sleeve for mounting on a motor of the spindle, wherein the motor cooling sleeve is provided with a first cooling channel.

[0009] The sleeve is provided with a second cooling channel, a third cooling channel, and a liquid inlet. One end of the second cooling channel and the third cooling channel meet and are connected to the liquid inlet. The second cooling channel is connected to the first cooling channel to introduce coolant into the first cooling channel so that the first cooling channel cools the motor cooling sleeve. The sleeve also has a return channel, which is connected to the first cooling channel to draw out the coolant in the first cooling channel. The sleeve is provided with a nozzle for spraying coolant onto the cutting tool at the front end of the spindle. The third cooling channel is connected to the nozzle to introduce coolant into the nozzle.

[0010] In some embodiments, the sleeve has a cooling shaft section, and the motor cooling sleeve is fitted inside the cooling shaft section;

[0011] The third cooling channel extends along the cooling shaft section and also exchanges heat with the motor cooling jacket through the cooling shaft section to cool the motor cooling jacket.

[0012] In some embodiments, the sleeve is provided with a first annular flow channel, and one end of both the second cooling flow channel and the third cooling flow channel are connected to the first annular flow channel so that they converge through the first annular flow channel;

[0013] The liquid inlet is also connected to the first annular flow channel, so that the junction of the second cooling flow channel and the third cooling flow channel is connected to the liquid inlet through the first annular flow channel.

[0014] In some embodiments, the sleeve is provided with a liquid outlet communicating with the return liquid channel;

[0015] Both the liquid outlet and the return flow channel are connected to the first annular flow channel, so that the liquid outlet is connected to the return flow channel through the first annular flow channel.

[0016] In some embodiments, the second cooling channel extends within the wall thickness of the cooling shaft section, and the inner wall of the cooling shaft section is provided with a first connecting hole that extends to the second cooling channel, and the second cooling channel communicates with the first cooling channel through the first connecting hole;

[0017] And / or, the return liquid channel extends within the wall thickness of the cooling shaft section, and the inner wall of the cooling shaft section is provided with a second connecting hole that extends through the return liquid channel, and the return liquid channel communicates with the first cooling channel through the second connecting hole.

[0018] In some embodiments, the spindle cooling device further includes a front bearing housing for providing support to the rotor shaft at the front end of the spindle;

[0019] The front bearing housing is provided with a fourth cooling channel, which is used to communicate with the second cooling channel to introduce coolant to cool the front bearing housing.

[0020] The fourth cooling channel is also connected to the return channel so that the internal coolant can be drawn out through the return channel.

[0021] In some embodiments, the front bearing housing is sleeved inside the sleeve body and located on one side of the motor cooling sleeve, and the fourth cooling channel includes a first annular groove provided on the outer wall of the front bearing housing, and the first annular groove is provided with a step.

[0022] The first annular groove has a notch at its shoulder, and the first annular groove is connected to the second cooling channel through the notch; wherein, when there are two or more second cooling channels, the number of notches is equal to the number of second cooling channels and corresponds one-to-one, and the flow area of ​​each notch is consistent with the flow area of ​​the corresponding second cooling channel.

[0023] In some embodiments, the spindle cooling device further includes a rear bearing housing for providing support for the rotor shaft at the rear end of the spindle;

[0024] The rear bearing housing is provided with a fifth cooling channel, which is connected to the second cooling channel to introduce coolant from the second cooling channel to cool the rear bearing housing.

[0025] The fifth cooling channel is also connected to the return channel so that the internal coolant can be drawn out through the return channel.

[0026] In some embodiments, the fifth cooling channel is also connected to the third cooling channel to introduce coolant from the third cooling channel to cool the rear bearing housing.

[0027] In some embodiments, the third cooling channel is connected to each nozzle via a second annular channel.

[0028] The present invention also provides an electric spindle comprising the spindle cooling device described in any one of the above-described embodiments.

[0029] The spindle cooling device and electric spindle provided by the present invention have the following beneficial effects:

[0030] 1. The second cooling channel, which forms the motor cooling channel, and the third cooling channel, which forms the ring spray channel, converge at one end and then enter liquid through the same inlet. The two cooling channels form a parallel connection structure at one end. Compared with the series connection, this can reduce the pressure at the inlet under the same flow rate. In other words, if the pressure at the inlet is controlled at a higher level, more cooling flow can be allowed, thereby increasing the cooling efficiency under the same pressure.

[0031] 2. Since the third cooling channel can also cool the motor cooling sleeve when it passes over the cooling shaft section, both the second cooling channel that forms the motor cooling channel and the third cooling channel that forms the ring spray channel can cool the motor cooling sleeve. This makes the motor cooling sleeve cool the motor better, improves the cooling efficiency of the spindle, and extends the service life of the spindle.

[0032] 3. The first cooling channel for cooling the motor, the fourth cooling channel for cooling the front bearing housing, and the fifth cooling channel for cooling the rear bearing housing are connected in parallel between the second cooling channel and the return channel. Compared with the series connection, the pressure at the inlet at the same flow rate can be reduced. In other words, if the pressure at the inlet is controlled at a higher level, a larger cooling flow rate can be allowed, thereby increasing the cooling efficiency at the same pressure. Attached Figure Description

[0033] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0034] Figure 1 This is a cross-sectional view of the spindle cooling device of the present invention, showing the cooling of the motor, the front bearing housing and the rear bearing housing.

[0035] Figure 2 This is a cross-sectional view of the spindle cooling device of the present invention, showing the connection between the liquid inlet and the liquid outlet and the first annular flow channel.

[0036] Figure 3 This is a cross-sectional view of the spindle cooling device of the present invention, reflecting the cooling of the motor cooling jacket.

[0037] Figure 4 This is a schematic diagram of the motor cooling jacket.

[0038] Figure 5 This is a schematic diagram showing the notch groove on the front bearing housing;

[0039] Figure 6 This is a cross-sectional view of the spindle cooling device of the present invention, reflecting the cooling of the rear bearing housing.

[0040] Figure 7 This is a cross-sectional view of the spindle cooling device of the present invention, reflecting the third cooling channel.

[0041] Figure 8 This is a schematic diagram showing the connection between the third cooling channel and the nozzle inside the spindle cooling device of the present invention;

[0042] Figure 9 This is a schematic diagram of the flow channels within the spindle cooling device of the present invention.

[0043] The attached figures are labeled as follows:

[0044] 1. Front end cap; 3. Flange; 4. Front bearing housing; 5. First annular groove; 5a. Step; 6. Notch groove; 7. First channel; 9. Bushing; 11. Second cooling channel; 11a. Third cooling channel; 12. First connecting hole; 21. Plug; 22. First connecting channel; 22a. Second connecting channel; 23. Rear bearing housing; 24. Fifth cooling channel; 25. First annular channel; 26. Liquid inlet; 27. Rear end cap; 28. Second channel; 29. ​​Third channel; 31. 32. Return flow channel; 43. Second connecting hole; 44. Third connecting flow channel; 45. Liquid outlet; 46. Fourth channel; 47. Fifth channel; 58. Second annular flow channel; 59. Sixth channel; 50. Seventh channel; 51. Eighth channel; 60. Nozzle; 71. Connecting groove; 82. Annular groove; 80a. First cooling flow channel; 88. Motor cooling sleeve; 91. Cooling shaft section; 100. Sleeve body; 200. Motor; 201. Rotor shaft at the front end of the main shaft; 202. Rotor shaft at the rear end of the main shaft. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0047] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0048] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the structures, proportions, sizes, etc., shown in the accompanying drawings are only for the purpose of illustrative purposes and to facilitate understanding and reading by those skilled in the art, and are not intended to limit the conditions under which the invention can be implemented. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives achieved by the invention, should still fall within the scope of the technical content disclosed in the invention. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0049] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0050] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0051] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0052] See also Figure 1-9 As shown, according to an embodiment of the present invention, a spindle cooling device is provided, which includes a sleeve 100 and a motor cooling sleeve 88. The motor cooling sleeve 88 is used to be fitted onto the motor 200 of the spindle to cool the motor 200. The motor cooling sleeve 88 is provided with a first cooling channel 80a, through which coolant is introduced to cool the motor cooling sleeve 88. The low-temperature motor cooling sleeve 88, after being fitted onto the motor 200, can cool the motor 200.

[0053] The aforementioned sleeve 100 is provided with a second cooling channel 11 and a third cooling channel 11a (e.g., Figure 7 (As shown) and inlet 26. The second cooling channel 11 and the third cooling channel 11a meet at one end and communicate with the inlet 26. The second cooling channel 11 communicates with the first cooling channel 80a to introduce coolant into the first cooling channel 80a, allowing the first cooling channel 80a to cool the motor cooling jacket 88. The aforementioned jacket 100 also has a return channel 31, which communicates with the first cooling channel 80a to draw out the coolant within the first cooling channel 80a. The aforementioned jacket 100 is provided with a nozzle 60 for spraying coolant onto the cutting tool at the front end of the spindle. The third cooling channel 11a communicates with the nozzle 60 to introduce coolant into the nozzle 60.

[0054] like Figure 7 and Figure 8As shown, the number of nozzles 60 can be two or more, and they are evenly distributed in a circular pattern around the circumference of the sleeve 100. The third cooling channel 11a is connected to each nozzle 60 to introduce coolant into each nozzle 60. Each nozzle 60 sprays coolant onto the cutting tool and the workpiece in a circumferential direction, forming a ring spray, which can improve the cooling effect of the cutting tool and the workpiece.

[0055] In the above example, the second cooling channel 11 forms part of the motor cooling channel. Coolant flows into the second cooling channel 11 from the inlet 26, then flows through the first cooling channel 80a and exits from the return channel 31. As the coolant flows through the first cooling channel 80a, it cools the motor cooling jacket 88, allowing the motor cooling jacket 88 to cool the spindle motor 200 housed inside. Additionally, after flowing into the third cooling channel 11a from the inlet 26, the coolant can be sprayed out through the nozzle 60. The third cooling channel 11a and the nozzle 60 are connected to form an annular spray channel.

[0056] The second cooling channel 11 and the third cooling channel 11a meet at one end and then enter liquid through the same liquid inlet 26. The two cooling channels 11 and 11a form a parallel connection structure at one end. Compared with the series connection, the pressure at the liquid inlet 26 at the same flow rate can be reduced. In other words, if the pressure at the liquid inlet 26 is controlled at a higher level, more cooling flow can be allowed to pass through, further increasing the cooling efficiency.

[0057] like Figure 7 As shown, the aforementioned sleeve 100 has a cooling shaft section 91, and the aforementioned motor cooling sleeve 88 is sleeved inside the cooling shaft section 91, with the outer wall of the motor cooling sleeve 88 facing the inner wall of the cooling shaft section 91. The aforementioned third cooling channel 11a extends along the cooling shaft section 91 and also exchanges heat with the motor cooling sleeve 88 through the cooling shaft section 91 to cool the motor cooling sleeve 88. Specifically, when the coolant flows through the third cooling channel 11a, it can cool the cooling shaft section 91. The cooled cooling shaft section 91 can then exchange heat with the motor cooling sleeve 88 sleeved inside, thereby cooling the motor cooling sleeve 88.

[0058] In the above example, since the third cooling channel 11a can also cool the cold zone sleeve of the motor 200 when it passes over the cooling shaft section 91, both the second cooling channel 11 that constitutes the motor cooling channel and the third cooling channel 11a that constitutes the ring spray channel can cool the motor cooling sleeve 88. This makes the cooling effect of the motor cooling sleeve 88 on the motor 200 better, which can improve the cooling efficiency of the spindle and extend the service life of the spindle.

[0059] To achieve the technical effect of having one end of the aforementioned second cooling channel 11 and third cooling channel 11a converge and connect with the liquid inlet 26, such as Figure 1 , Figure 2 and Figure 7 As shown, the aforementioned sleeve 100 may be provided with a first annular flow channel 25. One end of both the aforementioned second cooling flow channel 11 and the third cooling flow channel 11a are connected to the first annular flow channel 25 so that they converge through the first annular flow channel 25. The aforementioned liquid inlet 26 is also connected to the first annular flow channel 25, so that the confluence end of the second cooling flow channel 11 and the third cooling flow channel 11a is connected to the liquid inlet 26 through the first annular flow channel 25.

[0060] In the above example, by setting the first annular flow channel 25, the technical effect of the second cooling flow channel 11 and the third cooling flow channel 11a converging at one end and communicating with the liquid inlet 26 can be achieved.

[0061] like Figure 1 and Figure 2 As shown, the aforementioned sleeve 100 is provided with a liquid outlet 43 that communicates with the return liquid channel 31. Both the liquid outlet and the return liquid channel 31 are connected to the first annular channel 25, so that the liquid outlet 43 communicates with the return liquid channel 31 through the first annular channel 25.

[0062] In the above example, the inlet 26 and the outlet 43 share the same annular flow channel (i.e., the first annular flow channel 25), which allows some of the coolant to circulate inside the spindle through the first annular flow channel 25, thereby improving the utilization rate of the coolant.

[0063] In a specific application example, the aforementioned second cooling channels 11 can be two or more, and are evenly distributed in a circular pattern around the circumference of the spindle to improve the efficiency of introducing coolant into the motor cooling jacket 88. Similarly, the aforementioned third cooling channels 11a can also be two or more, and are evenly distributed in a circular pattern around the circumference of the spindle to improve the cooling effect of the third cooling channels 11a on the cooling shaft section 91. The aforementioned return channels 31 can also be two or more, and are evenly distributed in a circular pattern around the circumference of the spindle to improve the return efficiency.

[0064] In order to distribute the flow rate reasonably, preferably, the number of the second cooling channel 11, the third cooling channel 11a and the return channel 31 are all equal.

[0065] To achieve the aforementioned technical effect of connecting the second cooling channel 11 with the first cooling channel 80a, such as... Figure 1 and Figure 3As shown, the aforementioned second cooling channel 11 extends within the wall thickness of the cooling shaft section 91. A first connecting hole 12, penetrating the second cooling channel 11, is provided on the inner wall of the cooling shaft section 91. The second cooling channel 11 communicates with the first cooling channel 80a through the first connecting hole 12. Specifically, the first cooling channel 80a includes a groove structure provided on the outer wall of the motor cooling sleeve 88. The opening of the first connecting hole 12 is opposite to the opening of the groove structure, so that the first connecting hole 12 communicates with the groove structure. The first cooling channel 80a communicates with the first connecting hole 12 through the groove structure.

[0066] The first connecting hole 12 mentioned above can extend radially along the main shaft, and the number of the first connecting holes 12 can be two or more, and they are arranged sequentially at intervals along the axial direction of the main shaft.

[0067] To achieve the technical effect of connecting the aforementioned return flow channel 31 with the first cooling flow channel 80a, such as... Figure 1 and Figure 3 As shown, the return flow channel 31 extends within the wall thickness of the cooling shaft section 91. The inner wall of the cooling shaft section 91 is provided with a second connecting hole 32 that extends through the return flow channel 31. The return flow channel 31 communicates with the first cooling flow channel 80a through the second connecting hole 32. Specifically, the first cooling flow channel 80a includes a groove structure provided on the outer wall of the motor cooling sleeve 88. The opening of the second connecting hole 32 is opposite to the opening of the groove structure, so that the second connecting hole 32 communicates with the groove structure. The first cooling flow channel 80a communicates with the second connecting hole 32 through the groove structure.

[0068] The aforementioned second connecting hole 32 can extend radially along the main shaft, and the number of second connecting holes 32 can be two or more, arranged sequentially at intervals along the axial direction of the main shaft.

[0069] like Figure 1 As shown, the aforementioned spindle cooling device also includes a front bearing housing 4, which provides support for the rotor shaft 201 at the front end of the spindle. The front bearing housing 4 is provided with a fourth cooling channel, which communicates with the second cooling channel 11 to introduce coolant to cool the front bearing housing 4. The fourth cooling channel also communicates with a return channel 31 to draw out the internal coolant.

[0070] It should be noted that in this application, the front end of the spindle refers to the tool mounting end of the spindle, and the rear end of the spindle refers to the end of the spindle that is away from the tool mounting end.

[0071] In the above example, by connecting the fourth cooling channel between the second cooling channel 11 and the return channel 31, and since the first cooling channel 80a is also connected between the second cooling channel 11 and the return channel 31, the fourth cooling channel and the first cooling channel 80a are arranged in parallel. Compared with the series connection, the pressure at the inlet 26 at the same flow rate can be reduced. In other words, if the pressure at the inlet 26 is controlled at a higher level, more cooling flow can be allowed to pass through, further increasing the cooling efficiency.

[0072] In a specific application example, such as Figure 1 As shown, the aforementioned front bearing housing 4 is fitted inside the sleeve body 100 and located on one side of the motor cooling sleeve 88. The aforementioned fourth cooling channel includes a first annular groove 5 provided on the outer wall of the front bearing housing 4. The first annular groove 5 has a step 5a, which increases the inner wall area of ​​the first annular groove 5, thereby increasing the contact area between the coolant and the front bearing housing 4 and improving the cooling effect of the coolant on the front bearing housing 4.

[0073] like Figure 1 and Figure 5 As shown, the first annular groove 5 has a notch 6 at its shoulder, and the first annular groove 5 is connected to the second cooling channel 11 through the notch 6. When there are two or more second cooling channels 11, the number of notches 6 is equal to the number of second cooling channels 11 and corresponds one-to-one, and the flow area of ​​each notch 6 is consistent with the flow area of ​​the corresponding second cooling channel 11.

[0074] In the above example, since the flow area of ​​each notch 6 is consistent with the flow area of ​​the corresponding second cooling channel 11, this is beneficial to improving the efficiency of cooling water when passing through the notch 6.

[0075] like Figure 1 As shown, the aforementioned spindle cooling device also includes a rear bearing housing 23, which provides support for the rotor shaft 202 at the rear end of the spindle. The rear end of the spindle refers to the end of the spindle opposite to the tool mounting end. The rear bearing housing 23 is provided with a fifth cooling channel 24, which communicates with the second cooling channel 11 to introduce coolant from the second cooling channel 11 to cool the rear bearing housing 23. The fifth cooling channel 24 also communicates with a return channel 31 to draw out the internal coolant.

[0076] In the above example, by connecting the fifth cooling channel 24 between the second cooling channel 11 and the return channel 31, and since the first cooling channel 80a is also connected between the second cooling channel 11 and the return channel 31, the fifth cooling channel 24 and the first cooling channel 80a are arranged in parallel. Compared with the series connection, the pressure at the inlet 26 at the same flow rate can be reduced. In other words, if the pressure at the inlet 26 is controlled at a higher level, more cooling flow can be allowed to pass through, further increasing the cooling efficiency.

[0077] Furthermore, the aforementioned fifth cooling channel 24 is also connected to the third cooling channel 11a to introduce coolant from the third cooling channel 11a to cool the rear bearing housing 23.

[0078] In the example above, the fifth cooling channel 24 is connected to both the third cooling channel 11a and the second cooling channel 11, which allows for the introduction of more coolant, thereby improving the cooling effect on the rear bearing housing 23.

[0079] In a specific application example, such as Figure 6 As shown, the aforementioned fifth cooling channel 24 can be an annular channel. The fifth cooling channel 24 is connected to the second cooling channel 11 through the first connecting channel 22, and is connected to the third cooling channel 11a through the second connecting channel 22a, and is connected to the return channel 31 through the third connecting channel 41.

[0080] In the above example, since the fifth cooling channel 24 is an annular channel, the rear bearing housing 23 can be cooled in the circumferential direction, thereby improving the cooling effect on the rear bearing housing 23.

[0081] like Figure 7 and Figure 8 As shown, the aforementioned third cooling channel 11a can be connected to each nozzle 60 through the second annular channel 50. The second annular channel 50 is used to collect the cooling water in the preparation area of ​​each nozzle 60, which can improve the uniformity of water spray from each nozzle 60.

[0082] It should be noted that the aforementioned sleeve 100 can be composed of multiple parts. In a specific application example, such as... Figure 1 As shown, the sleeve 100 may include a bushing 9, a front cover 1, a flange 3, and a rear cover 27. The flange 3 is located at one end of the bushing 9, the front cover 1 is located at the end of the flange 3 facing away from the bushing 9, and the rear cover 27 is located at the other end of the bushing 9. The aforementioned nozzle 60 is located on the front cover 1, and the aforementioned cooling shaft section 91 is located on the bushing 9. The aforementioned flow channels can be opened on the corresponding components according to actual conditions.

[0083] The present invention also provides an electric spindle, which may include the spindle cooling device described above. Since the electric bearing uses the aforementioned spindle cooling device, the second cooling channel 11 and the third cooling channel 11a converge at one end and are fed into the same inlet 26. The two cooling channels 11 and 11a form a parallel connection structure at one end, which reduces the pressure at the inlet 26 at the same flow rate compared to a series connection. In other words, if the pressure at the inlet 26 is controlled at a higher level, a larger cooling flow rate can be allowed, further increasing the cooling efficiency.

[0084] For ease of understanding, the overall structure of the present invention will be described below, and its working principle will be explained.

[0085] like Figure 1 Figure 10 shows a schematic diagram of the combined structure of the motor cooling channel (i.e., the aforementioned second cooling channel 11) and the annular spray channel (i.e., the aforementioned third cooling channel 11a), including the parts, channels, movement directions, hole positions, and related structures associated with the motor cooling channel and the annular spray channel. The purpose of this invention is to connect the two individual channels by employing a combined structure of the motor cooling channel and the annular spray channel, thereby improving the overall cooling efficiency and annular spray efficiency of the spindle, overcoming the limitations of individual channels in achieving a single effect, and simultaneously improving the spindle's machining accuracy and service life.

[0086] The overall invention principle is as follows: 1. Motor cooling channel section: This includes a rear bearing cooling section, a motor cooling section, and a front bearing cooling section. Specifically, in the rear bearing cooling section: coolant, such as cooling water, is introduced into the inlet 26 at the rear end cover 27. The inlet 26 can be connected to a water inlet connector. The coolant flows into the first annular channel 25 at the rear end, flowing through all radially corresponding areas. A portion of the coolant then flows into the second cooling channel 11 and, via the first connecting channel 22 radially upwards from the second cooling channel 11, enters the fifth cooling channel 24 on the rear bearing housing 23 to cool the rear bearing housing 23. Another portion of the coolant flows into the third cooling channel 11a and, via the second connecting channel 22a radially upwards from the third cooling channel 11a, enters the fifth cooling channel 24 on the rear bearing housing 23 to cool the rear bearing housing 23. The coolant in the fifth cooling channel 24 flows out through the third connecting channel 41 to the return channel 31, then flows into the first annular channel 25 and exits through the outlet 43. A liquid outlet pipe connector can be connected at outlet 43.

[0087] Motor cooling section: The aforementioned second cooling channel 11, third cooling channel 11a, and return channel 31 all extend axially along the bushing 9, and the number of each is equal. The second cooling channel 11, third cooling channel 11a, and return channel 31 are all evenly distributed in a circular pattern around the bushing 9. A portion of the coolant enters one-third of the second cooling channels 11 within the bushing 9. Each second cooling channel 11 has axial and radial branches. The axial branch flows towards the bearing seat 4, while the radial branch enters the first cooling channel 80a on the motor cooling sleeve 88 via the first connecting hole 12. The first cooling channel 80a includes a groove structure on the motor cooling sleeve 88, comprising annular grooves 80 arranged sequentially at intervals along the axial direction of the motor cooling sleeve 88 and connecting grooves 79 connecting adjacent annular grooves 80. The coolant then flows out through the second connecting hole 32 to the return channel 31, thus cooling the motor.

[0088] Front bearing cooling section: The axial branch of the flow to the front bearing housing 4 reaches the first channel 7, then to the notch groove 6, then to the first annular groove 5, and then enters the return flow channel 31, which accounts for 1 / 3 of the total number of axial flow channels, through the second channel 28 and the third channel 29 for return water cooling, thereby achieving cooling of the front bearing housing 4.

[0089] 2. Annular spray channel section: The coolant flows from the rear annular groove channel 25 into the third cooling channel 11a, then to the fourth channel 48 at the flange, then to the fifth channel 49, and enters the second annular channel 50. Finally, it enters the nozzle 60 through the sixth channel 57, the seventh channel 58 and the eighth channel 59. The nozzle 60 sprays coolant to cool the workpiece and the cutting tool.

[0090] The above-described cooling process achieves the integration of the motor cooling channel and the ring spray channel, saving the need for dedicated channel space designation and avoiding the need for setting up the rear pipeline location.

[0091] It should be noted that, in order to allow the coolant to flow in each channel, plugs 21 can be installed at various points on the sleeve according to actual needs.

[0092] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0093] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A spindle cooling device, characterized in that: It includes a sleeve (100) and a motor cooling sleeve (88) for mounting on a motor (200) on a spindle, wherein the motor cooling sleeve (88) is provided with a first cooling channel (80a); The sleeve (100) is provided with a second cooling channel (11), a third cooling channel (11a) and a liquid inlet (26). One end of the second cooling channel (11) and the third cooling channel (11a) meet and are connected to the liquid inlet (26). The second cooling channel (11) is connected to the first cooling channel (80a) to introduce coolant into the first cooling channel (80a) so that the first cooling channel (80a) cools the motor cooling jacket (88); the jacket (100) also has a return channel (31), which is connected to the first cooling channel (80a) to draw out the coolant in the first cooling channel (80a); The sleeve (100) is provided with a nozzle (60) for spraying coolant to the tool at the front end of the spindle, and the third cooling channel (11a) is connected to the nozzle (60) to introduce coolant into the nozzle (60); The sleeve (100) has a cooling shaft section (91), and the motor cooling sleeve (88) is sleeved on the inner side of the cooling shaft section (91); The third cooling channel (11a) extends on the cooling shaft section (91) and also exchanges heat with the motor cooling jacket (88) through the cooling shaft section (91) to cool the motor cooling jacket (88).

2. The spindle cooling device according to claim 1, characterized in that: The sleeve (100) is provided with a first annular flow channel (25), and one end of both the second cooling flow channel (11) and the third cooling flow channel (11a) are connected to the first annular flow channel (25) so that they converge through the first annular flow channel (25); The liquid inlet (26) is also connected to the first annular flow channel (25), so that the intersection of the second cooling flow channel (11) and the third cooling flow channel (11a) is connected to the liquid inlet (26) through the first annular flow channel (25).

3. The spindle cooling device according to claim 2, characterized in that: The sleeve (100) is provided with a liquid outlet (43) that communicates with the return liquid channel (31); The outlet (43) and the return channel (31) are both connected to the first annular channel (25), so that the outlet (43) is connected to the return channel (31) through the first annular channel (25).

4. The spindle cooling device according to any one of claims 1 to 3, characterized in that: The second cooling channel (11) extends within the wall thickness of the cooling shaft section (91), and the inner wall of the cooling shaft section (91) is provided with a first connecting hole (12) that extends to the second cooling channel (11). The second cooling channel (11) communicates with the first cooling channel (80a) through the first connecting hole (12). And / or, the return flow channel (31) extends within the wall thickness of the cooling shaft section (91), and the inner wall of the cooling shaft section (91) is provided with a second connecting hole (32) that extends through the return flow channel (31), and the return flow channel (31) communicates with the first cooling flow channel (80a) through the second connecting hole (32).

5. The spindle cooling device according to any one of claims 1 to 3, characterized in that: It also includes a front bearing housing (4) for providing support for the rotor shaft (201) at the front end of the main shaft; The front bearing housing (4) is provided with a fourth cooling channel, which is used to communicate with the second cooling channel (11) to introduce coolant to cool the front bearing housing (4); The fourth cooling channel is also connected to the return channel (31) so as to draw out the internal coolant through the return channel (31).

6. The spindle cooling device according to claim 5, characterized in that: The front bearing housing (4) is sleeved on the inner side of the sleeve body (100) and located on one side of the motor cooling sleeve (88). The fourth cooling channel includes a first annular groove (5) provided on the outer wall of the front bearing housing (4). The first annular groove (5) is provided with a step (5a). The first annular groove (5) has a notch (6) at its shoulder, and the first annular groove (5) is connected to the second cooling channel (11) through the notch (6); wherein, when there are two or more second cooling channels (11), the number of notches (6) is equal to the number of second cooling channels (11) and corresponds one-to-one, and the flow area of ​​each notch (6) is consistent with the flow area of ​​the corresponding second cooling channel (11).

7. The spindle cooling device according to any one of claims 1 to 3 and 6, characterized in that: It also includes a rear bearing housing (23) for providing support for the rotor shaft (202) at the rear end of the main shaft; The rear bearing housing (23) is provided with a fifth cooling channel (24), which is connected to the second cooling channel (11) to introduce coolant from the second cooling channel (11) to cool the rear bearing housing (23). The fifth cooling channel (24) is also connected to the return channel (31) so as to draw out the internal coolant through the return channel (31).

8. The spindle cooling device according to claim 7, characterized in that: The fifth cooling channel (24) is also connected to the third cooling channel (11a) to introduce coolant from the third cooling channel (11a) to cool the rear bearing housing (23).

9. The spindle cooling device according to any one of claims 1 to 3, 6, and 8, characterized in that: The third cooling channel (11a) is connected to each nozzle (60) through the second annular channel (50).

10. An electric spindle, characterized in that: Includes the spindle cooling device according to any one of claims 1-9.

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