Cooling structure for an electric spindle and electric spindle

Abstract

The application provides a cooling structure for an electric spindle and the electric spindle, wherein the cooling structure comprises two or more cooling flow channels which are not communicated with each other, each of the cooling flow channels is arranged on the electric spindle, and each of the cooling flow channels receives external cooling medium through a different cooling medium inlet. According to the technical scheme of the application, since the cooling flow channels are not communicated with each other and each of the cooling flow channels receives external cooling medium through a different cooling medium inlet, the electric spindle can selectively make part or all of the cooling flow channels work under different heat generation conditions, such as different machining and testing conditions, so as to adapt to the heat generation requirement of the electric spindle, thereby achieving the purpose of adjusting the cooling capacity of the cooling structure.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electric spindles, and particularly relates to a cooling structure for an electric spindle and the electric spindle. BACKGROUND

[0002] At present, the spindle generally has a ring spray cooling flow channel and a bearing cooling flow channel. The bearing cooling flow channel is mostly realized in a cooling mode of giving an axial and circumferential flow channel to the periphery of the spindle bearing. The ring spray cooling flow channel is realized by giving a circumferentially arranged ring spray flow channel outlet at the spindle end cover.

[0003] The prior art discloses an electric spindle comprising a ring spray cooling flow channel and a bearing cooling flow channel. The ring spray cooling flow channel and the bearing cooling flow channel are communicated so that they can be liquid-in through the same liquid inlet hole and liquid-out through the same liquid outlet hole. The ring spray cooling flow channel and the bearing cooling flow channel cooperate to directly affect the heating of the electric spindle bearing and the cooling effect during part machining.

[0004] The electric spindle has different heating amounts under different working conditions such as machining conditions, non-machining conditions and test conditions, respectively. The cooling structure of the existing electric spindle can only provide a single cooling amount and cannot adjust the cooling amount according to different working conditions. Therefore, the problem needs to be solved. SUMMARY

[0005] Therefore, the present application provides a cooling structure for an electric spindle and the electric spindle, which can solve the technical problem that the cooling structure of the electric spindle in the prior art can only provide a single cooling amount and cannot adjust the cooling amount according to different working conditions.

[0006] In order to solve the above problems, the present application provides a cooling structure for an electric spindle, which comprises two or more cooling flow channels that are not communicated with each other. Each of the cooling flow channels is arranged on the electric spindle, and each of the cooling flow channels receives external cooling medium through a different cooling medium inlet.

[0007] In some embodiments, each of the cooling flow channels comprises a first cooling flow channel;

[0008] The first cooling flow channel has a first cooling medium inlet, the first cooling flow channel has two or more parallel first cooling branch sections, one end of each of the first cooling branch sections is communicated with the first cooling medium inlet, and the other end of each of the first cooling branch sections is communicated with a nozzle. Each of the nozzles is arranged at the front end of the electric spindle to spray cooling medium to the tool.

[0009] And / or, the first cooling flow channel has a first circumferential cooling branch section, the first circumferential cooling branch section is sequentially connected by two or more first linear flow channels, each of the first linear flow channels is sequentially arranged along the circumference of the electric spindle, and each of the first linear flow channels has at least one end penetrating the outer wall of the electric spindle.

[0010] In some embodiments, when the first cooling flow channel has two or more parallel first cooling branch sections, and the other end of each of the first cooling branch sections is communicated with a nozzle, the other end of each of the first cooling branch sections is communicated with the corresponding nozzle through a different connecting groove section; each of the connecting groove sections extends along the circumference of the electric spindle, and each connecting groove section is communicated with two or more nozzles sequentially arranged along the circumference of the electric spindle; and each of the nozzles is arranged around the electric spindle.

[0011] In some embodiments, when the first cooling flow channel has two or more parallel first cooling branch sections, and the first cooling flow channel has a first circumferential cooling branch section extending along the circumference of the electric spindle; the first circumferential cooling branch section is sequentially connected by two or more first linear flow channels, each of the first linear flow channels has at least one end penetrating the outer wall of the electric spindle,

[0012] Each of the first cooling branch sections extends along the axial direction of the electric spindle, and each of the first cooling branch sections is sequentially and spacedly arranged along the circumference of the electric spindle; each of the first cooling branch sections is communicated through the first circumferential cooling branch section.

[0013] In some embodiments, each of the two adjacent first linear flow channels in the first circumferential cooling branch section intersects to form a first intersection, the number of the first intersections is equal to the number of the first cooling branch sections, and each first cooling branch section is communicated with the first circumferential cooling branch section through a corresponding first intersection.

[0014] In some embodiments, when the first cooling flow channel has two or more parallel first cooling branch sections, each of the first cooling branch sections is arranged on the front bearing seat of the electric spindle;

[0015] When the first cooling flow channel has a first circumferential cooling branch section, the first circumferential cooling branch section is arranged on the front bearing seat of the electric spindle.

[0016] In some embodiments, each of the cooling flow channels includes a second cooling flow channel, the second cooling flow channel has a second circumferential cooling branch section, the second circumferential cooling branch section is sequentially connected by two or more second linear flow channels, each of the second linear flow channels is sequentially arranged along the circumference of the electric spindle; wherein at least one end of each of the second linear flow channels penetrates the outer wall of the electric spindle, and the openings of each of the second linear flow channels on the outer wall of the electric spindle are closed by a closing member;

[0017] The second cooling flow channel further includes a cooling medium inlet section and a cooling medium outlet section, both of which extend along the axial direction of the electric spindle, and one of them is connected in series at one end of the second circumferential cooling branch section, and the other is connected in series at the other end of the second circumferential cooling branch section.

[0018] In some embodiments, at least part of the cooling flow channels flow through the same part of the electric spindle.

[0019] In some embodiments, when each of the cooling flow channels includes a first cooling flow channel, and each of the cooling flow channels includes a second cooling flow channel, each of the cooling flow channels further includes a third cooling flow channel, the third cooling flow channel simultaneously flows through the front bearing seat and the rear bearing seat of the electric spindle, the first cooling flow channel flows through the front bearing seat, and the second cooling flow channel flows through the rear bearing seat.

[0020] In some embodiments, when the first cooling flow channel has two or more parallel first cooling branch sections, each of the first cooling branch sections extends along the axial direction of the electric spindle, and each of the first cooling branch sections is sequentially and spaced arranged along the circumference of the electric spindle,

[0021] The third cooling flow channel has two or more third cooling branch sections extending along the axial direction of the electric spindle, each of the third cooling branch sections is sequentially and staggered arranged along the circumference of the front bearing seat with each of the first cooling branch sections; the first cooling flow channel can flow through the front bearing seat through each of the first cooling branch sections, and the third cooling flow channel can flow through the front bearing seat through each of the third cooling branch sections.

[0022] In some embodiments, the third cooling flow channel has a third circumferential cooling branch section, each of the third circumferential cooling branch sections is connected by a third circumferential cooling branch section; wherein the third circumferential cooling branch section is sequentially connected by two or more third linear flow channels, each of the third linear flow channels is sequentially arranged along the circumference of the front bearing seat, and each of the third linear flow channels has at least one end penetrating the outer wall of the electric spindle.

[0023] In some embodiments, each two adjacent third straight flow channels in the third circumferential cooling branch section intersect to form a second intersection, the number of the second intersections is equal to the number of the third cooling branch sections, and each of the third cooling branch sections communicates with the third circumferential cooling branch section through a corresponding second intersection.

[0024] In some embodiments, the third cooling flow channel has a sleeve cooling branch section on the sleeve of the electric spindle, the sleeve cooling branch section is in series with the cooling branch section of the third cooling flow channel on the front bearing seat.

[0025] The third cooling flow channel further has a cooling medium outflow section in series with the sleeve cooling branch section, and the third cooling flow channel section can flow through the rear bearing seat through the cooling medium outflow section.

[0026] The application further provides an electric spindle, which can comprise the cooling structure for electric spindle according to any one of the above.

[0027] The cooling structure for electric spindle and the electric spindle provided by the application have the following beneficial effects:

[0028] 1. Since the cooling flow channels are not communicated with each other, and each cooling flow channel receives external cooling medium through a different cooling medium inlet, the electric spindle can selectively operate part or all of the cooling flow channels to adapt to the heat generation requirement of the electric spindle under different heat generation conditions such as different machining and testing conditions, so as to achieve the purpose of adjusting the cooling capacity of the cooling structure.

[0029] 2. Since each first cooling flow channel is separately communicated with the nozzle to spray cooling medium, such design can avoid the problem of poor machining tool cooling effect caused by uneven water spraying effect of a single first cooling flow channel.

[0030] 3. Since the first circumferential cooling branch section is connected by two or more first straight flow channels in sequence, the first circumferential cooling branch section can be machined by drilling holes on the outer wall of the electric spindle. Compared with the prior art which adopts two parts to form a circumferential cooling flow channel by sleeving, the present application directly processes a circumferential cooling flow channel on a part by drilling, without the need for cooperation with other parts, so as to simplify the part machining process and reduce the types of parts assembly and machining cost. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. The drawings in the following description are only exemplary, and for those skilled in the art, other drawings can be derived from the provided drawings without creative labor.

[0032] Figure 1 is a front view of the electric spindle of the present application;

[0033] Figure 2 is a left view of the electric spindle of the present application;

[0034] Figure 3 is a schematic view of the cooling structure for the electric spindle of the present application;

[0035] Figure 4 is a sectional view of the electric spindle of the present application at G-G in Figure 2

[0036] is a sectional view of the electric spindle of the present application at C-C in Figure 5 Figure 1 is a sectional view of the electric spindle of the present application at A-A in

[0037] Figure 6 Figure 1 is a sectional view of the electric spindle of the present application at M-M in

[0038] Figure 7 is a sectional view of the electric spindle of the present application at H-H in Figure 1

[0039] is a sectional view of the electric spindle of the present application at E-E in Figure 8 Figure 2 is a sectional view of the electric spindle of the present application at F-F in

[0040] Figure 9 Figure 1 is a sectional view of the electric spindle of the present application at D-D in

[0041] Figure 10 is a sectional view of the electric spindle of the present application at B-B in Figure 2

[0042] is a sectional view of the electric spindle of the present application at D-D in Figure 11 Figure 1 is a sectional view of the electric spindle of the present application at B-B in

[0043] Figure 12 Figure 1 is a sectional view of the electric spindle of the present application at B-B in

[0044] The reference signs are as follows:

[0045] ​​​​​​1, front bearing seat; 2, shaft sleeve; 3, third cooling medium inlet; 55, rear bearing seat; 56, cooling medium outflow section; 57, pipeline disc; 59, third cooling medium outlet; 66, first cooling medium inlet; a, first intersection; b, first linear flow channel; c, first cooling branch section; d, second linear flow channel; 88, front end flange; 89, connecting groove section; 90, nozzle; 93, front end cover; 96, cooling water jacket; 103, second cooling medium outlet; 104, second cooling medium inlet; 105, cooling medium outlet section; 106, cooling medium inlet section; e, third cooling branch section; f, third linear flow channel; g, second intersection; 1a, first cooling flow channel; 2a, second cooling flow channel; 3a, third cooling flow channel; 10a, first circumferential cooling branch section; 11a, second circumferential cooling branch section; 12a, third circumferential cooling branch section. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0047] In the description of the present application, it should be understood that the orientation words such as "front, rear, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component.

[0048] For purposes of the description hereinafter, spatial relations terms, such as "above", "below", "upper", "lower", and the like, can be used with respect to the device or feature under discussion. These spatial relation terms are used only to illustrate the relative spatial relationship between the device or feature under discussion and other devices or features as shown in the figures. It will be understood that the spatial relation terms are intended to encompass different orientations of the device or feature in use or operation in addition to the orientation depicted in the figures. For example, if a device or feature shown in the figures is turned over, elements described as "above" or "below" other elements or features would then be oriented "below" or "above" the other elements or features. Accordingly, the exemplary spatially relative terms are intended to encompass all possible orientations in use or operation of the devices or features. The devices or features can be positioned in other ways (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0049] In addition, it should be noted that the use of "first", "second", and the like, herein does not imply any particular ordering, but rather serves merely to identify various components. Thus, the use of "first" and "second" in the present disclosure does not necessarily imply that the components so designated are limited to the relative ordering of the components as described herein.

[0050] With reference to the drawings Figures 1-12 As shown, according to embodiments of the present application, a cooling structure for an electric spindle is provided, which includes two or more cooling flow channels that are not in communication with each other, each of the cooling flow channels is disposed on the electric spindle, and each of the cooling flow channels receives external cooling medium through a different cooling medium inlet.

[0051] In the above example, since each of the cooling flow channels is not in communication with each other, and each of the cooling flow channels receives external cooling medium through a different cooling medium inlet, the electric spindle can selectively operate some or all of the cooling flow channels to adapt to the heat generation requirement of the electric spindle under different heat generation conditions, such as different machining and testing conditions, thereby achieving the purpose of adjusting the cooling capacity of the cooling structure.

[0052] In addition, by providing the cooling flow channels that are not in communication with each other, each of the cooling flow channels can be used simultaneously, thereby increasing the utilization rate of the flow channels and the cooling efficiency. When each of the cooling flow channels is used individually, the utilization rate of water, electricity, hydraulic fluid, and gas under different testing and machining conditions can be saved. Since each of the cooling flow channels can be used together and individually, the cooling structure of the present application can match the use efficiency and space utilization under different conditions, and can prolong the service life of the electric spindle.

[0053] In some embodiments, as Figures 3 to 4As shown, each of the aforementioned cooling channels includes a first cooling channel 1a. The first cooling channel 1a has a first cooling medium inlet 66, through which it receives external cooling medium. The first cooling channel 1a has two or more parallel first cooling branch sections c, one end of each first cooling branch section c being connected to the first cooling medium inlet 66, and the other end of each first cooling branch section c being connected to a nozzle 90 (e.g., ...). Figure 8 (As shown). Each nozzle 90 is designed to be mounted on the front end of the electric spindle to spray cooling medium onto the tool. In a specific application example, each nozzle 90 may be mounted on the front end cover 93 of the electric spindle.

[0054] In the above example, the external cooling medium flows into the first cooling channel 1a through the first cooling medium inlet 66, and then splits into multiple streams that flow into each of the first cooling branch sections c, and are ejected from the nozzles 90 at the ends of each of the first cooling branch sections c to cool the tool. Since the first cooling channel 1a is connected to the nozzles 90 to cool the tool, in some applications, the first cooling channel 1a can also be called an annular spray cooling channel.

[0055] Since each first cooling channel 1a is individually connected to a nozzle 90 to spray the cooling medium, this design avoids problems such as poor cooling effect on the machining tool due to uneven water spraying effect of a single first cooling channel 1a. In addition, since the nozzles 90 at the ends of multiple first cooling channels 1a simultaneously realize the circumferential spraying function of the electric spindle, its circumferential spraying efficiency is also higher.

[0056] In addition, since each of the first cooling branch sections c is set in parallel, the cooling efficiency is relatively high.

[0057] In some implementations, such as Figures 7 to 8 As shown, the other end of each of the aforementioned first cooling branch sections c is connected to a corresponding nozzle 90 via different connecting groove sections 89. Each connecting groove section 89 extends circumferentially along the electric spindle, and each connecting groove section 89 is connected to two or more nozzles 90 arranged sequentially along the circumferential direction of the electric spindle, with each nozzle 90 arranged around the electric spindle.

[0058] In the above example, by providing a connecting groove 89 extending circumferentially along the electric spindle at the end of the first cooling branch section c, it is beneficial to enable the first cooling branch section c to be simultaneously connected to two or more nozzles 90 through the connecting groove 89, thereby improving the water spraying efficiency.

[0059] In a specific application example, each of the aforementioned first cooling branch sections c can be installed on the front bearing housing 1 of the electric spindle to cool the front bearing housing 1 of the electric spindle.

[0060] like Figure 4As shown, the aforementioned first cooling medium inlet 66 can also be arranged on the front bearing seat 1. In one specific application example, the first cooling medium inlet 66 can be arranged on the radial surface of the front bearing seat 1.

[0061] In some embodiments, as shown, Figures 5 to 6 As shown, the aforementioned first cooling flow channel 1a can have a first circumferential cooling branch section 10a, which is formed by two or more first linear flow channels b connected in sequence, each first linear flow channel b is arranged along the circumference of the electric spindle in sequence, and each first linear flow channel b penetrates the outer wall of the electric spindle at least at one end.

[0062] When the first circumferential cooling branch section 10a is formed by two first linear flow channels b connected in sequence, the first circumferential cooling branch section 10a forms a semi-ring shape. If a complete ring shape is desired, the first circumferential cooling branch section 10a is formed by at least three first linear flow channels b connected in sequence, and the first circumferential cooling branch section 10a is in a polygonal structure. In one specific application example, the aforementioned first circumferential cooling branch section 10a can be formed by four first linear flow channels b connected in sequence to form a quadrilateral structure.

[0063] In the above example, since the first circumferential cooling branch section 10a is formed by two or more first linear flow channels b connected in sequence, the first circumferential cooling branch section 10a can be machined by drilling holes in the outer wall of the electric spindle. Compared with the prior art of forming a circumferential cooling flow channel by using two parts in a sleeve fit, the present application directly machines a circumferential cooling flow channel on a part by drilling, without the need for cooperation with other parts, thereby simplifying the part machining process and reducing the number of parts and machining costs.

[0064] It should be noted that the through hole formed by each first linear flow channel b on the outer wall of the electric spindle can be closed by a closure member to allow the cooling medium to flow in the first circumferential cooling branch section 10a.

[0065] In one specific application example, the aforementioned first circumferential cooling branch section 10a can be arranged on the front bearing seat 1 of the electric spindle to cool the front bearing seat 1. The number of first circumferential cooling branch sections 10a can be two or more, and they are arranged in sequence along the axial direction of the front bearing seat 1, which can improve the cooling effect of the front bearing seat 1 in the circumferential direction.

[0066] In some embodiments, when the first cooling flow channel 1a has two or more parallel first cooling branch sections c, and the first cooling flow channel 1a has a first circumferential cooling branch section 10a extending along the circumference of the electric main shaft, the first circumferential cooling branch section 10a is connected by two or more first linear flow channels b in sequence, each first linear flow channel b has at least one end penetrating the outer wall of the electric main shaft, each first cooling branch section c extends along the axial direction of the electric main shaft, and each first cooling branch section c is arranged in sequence and spaced apart in the circumferential direction of the electric main shaft. Each first cooling branch section c is connected by the first circumferential cooling branch section 10a.

[0067] In the above example, since the first cooling branch section c extends along the axial direction of the electric main shaft, the first cooling branch section c is an axial cooling flow channel, and since the first circumferential cooling branch section 10a extends along the circumferential direction of the electric main shaft, the first circumferential cooling branch section 10a is a circumferential cooling flow channel. The combination of the first cooling branch section c and the first circumferential cooling branch section 10a improves the cooling efficiency of the axial and circumferential flow channels.

[0068] When the number of third circumferential cooling branch sections 12a is two or more, each third circumferential cooling branch section 12a is connected by each third cooling branch section e, and forms a parallel structure, thereby improving the circumferential cooling efficiency.

[0069] In order to achieve the effect that each first cooling branch section c is connected by the first circumferential cooling branch section 10a, in some embodiments, as shown in Figures 5 to 6 Each of the two adjacent first linear flow channels b in the first circumferential cooling branch section 10a intersects to form a first intersection a. The number of first intersections a is equal to the number of first cooling branch sections c, and each first cooling branch section c is connected to the first circumferential cooling branch section 10a by a corresponding first intersection a.

[0070] In the above example, the first cooling branch section c can be machined at the first intersection a of the two adjacent first linear flow channels b in the first circumferential cooling branch section 10a, and the connection between each first cooling branch section c and the first circumferential cooling branch section 10a can be achieved.

[0071] In some embodiments, as shown in Figure 3 and Figure 9As shown, the aforementioned cooling flow channels include the second cooling flow channel 2a, which has a second circumferential cooling branch section 11a formed by two or more second linear flow channels d connected in series, and each of the second linear flow channels d is arranged along the circumferential direction of the main shaft. At least one end of each of the second linear flow channels d penetrates the outer wall of the main shaft, and the opening of each of the second linear flow channels d on the outer wall of the main shaft is closed by a closure member.

[0072] As shown, the second cooling flow channel 2a further includes a cooling medium inlet section 106 and a cooling medium outlet section 105, and the second cooling flow channel 2a includes a second cooling medium inlet 104 located at the cooling medium inlet section 106 and a second cooling medium outlet 103 located at the cooling medium outlet section 105. Figure 3

[0073] The cooling medium inlet section 106 and the cooling medium outlet section 105 both extend along the axial direction of the main shaft, and one of them is connected in series at one end of the second circumferential cooling branch section 11a, and the other of them is connected in series at the other end of the second circumferential cooling branch section 11a.

[0074] In the above example, the cooling medium flows into the second cooling flow channel 2a from the cooling medium inlet section 106, then flows through the second circumferential cooling branch section 11a, and then flows out from the cooling medium outlet section 105. Among them, the cooling medium inlet section 106 and the cooling medium outlet section 105 are both axial cooling sections, the second circumferential cooling branch section 11a is a circumferential cooling section, and the cooling medium inlet section 106, the cooling medium outlet section 105 and the second circumferential cooling branch section 11a cooperate to improve the cooling efficiency of the axial and circumferential flow channels.

[0075] In addition, since the second circumferential cooling branch section 11a is formed by connecting two or more second linear flow channels d in series, the second circumferential cooling branch section 11a can be machined by drilling holes in the outer wall of the main shaft. Compared with the prior art of forming a circumferential cooling flow channel by sleeving two parts, the present application directly machines a circumferential cooling flow channel on a part by drilling, without the need for cooperation with other parts, thereby simplifying the part machining process and reducing the number of parts and machining costs.

[0076] ​In one specific application example, the second circumferential cooling branch section 11a described above can be arranged on the rear bearing seat 55 of the motorized spindle, and the cooling medium inlet section 106 and the cooling medium outlet section 105 both flow through the rear bearing seat 55 and both penetrate the rear end surface of the piping disc 57. The cooling medium inlet section 106, the cooling medium outlet section 105, and the second circumferential cooling branch section 11a cooperate to cool the rear bearing seat 55. In one specific application example, the aforementioned second circumferential cooling branch section 11a can be formed by four second linear flow channels d connected in series.

[0077] In some embodiments, at least part of the cooling flow channels flow through the same component of the motorized spindle.

[0078] In the example described above, part of the cooling flow channels can flow through the same component with a large amount of heat generation, such as the front bearing seat 1 or the rear bearing seat 55, so that the cooling effect on the component with a large amount of heat generation can be improved.

[0079] In some embodiments, when the cooling flow channels include the first cooling flow channel 1a, and the cooling flow channels include the second cooling flow channel 2a, as shown in Figure 10 the cooling flow channels further include the third cooling flow channel 3a, the third cooling flow channel 3a simultaneously flows through the front bearing seat 1 and the rear bearing seat 55 of the motorized spindle, the first cooling flow channel 1a flows through the front bearing seat 1, and the second cooling flow channel 2a flows through the rear bearing seat 55.

[0080] In the example described above, both the third cooling flow channel 3a and the first cooling flow channel 1a can cool the front bearing seat 1, so that when the third cooling flow channel 3a and the first cooling flow channel 1a are used simultaneously, the cooling effect on the front bearing seat 1 can be improved. Both the third cooling flow channel 3a and the second cooling flow channel 2a can cool the rear bearing seat 55, so that when the third cooling flow channel 3a and the second cooling flow channel 2a are used simultaneously, the cooling effect on the rear bearing seat 55 can be improved.

[0081] In some embodiments, when the first cooling flow channel 1a has two or more first cooling branch sections c in parallel, each first cooling branch section c extends in the axial direction of the motorized spindle, and each first cooling branch section c is arranged in the circumferential direction of the motorized spindle in sequence and is spaced apart, wherein, as shown in Figure 10 the third cooling flow channel 3a has two or more third cooling branch sections e extending in the axial direction of the motorized spindle, and each third cooling branch section e is arranged in the circumferential direction of the motorized spindle in sequence and is staggered with each first cooling branch section c. The first cooling flow channel 1a can flow through the front bearing seat 1 through each first cooling branch section c, and the third cooling flow channel 3a can flow through the front bearing seat 1 through each third cooling branch section e.

[0082] In the above example, by arranging each third cooling branch section e and each first cooling branch section c in the front bearing seat 1 in a staggered manner in the circumferential direction, each third cooling branch section e and each first cooling branch section c can be evenly arranged in the circumferential direction of the front bearing seat 1, so that each third cooling branch section e and each first cooling branch section c can provide better circumferential cooling effect for the front bearing seat 1 when each of the first cooling branch section c and the third cooling branch section e is used alone.

[0083] In the above example, each third cooling branch section e is arranged in parallel, so that the cooling efficiency is higher.

[0084] In some embodiments, as shown in Figure 11 and Figure 12 The third cooling flow channel 3a has a third circumferential cooling branch section 12a, and each third cooling branch section e is connected through the third circumferential cooling branch section 12a. The third circumferential cooling branch section 12a is connected by two or more third linear flow channels f, each third linear flow channel f is arranged in the circumferential direction of the front bearing seat 1, and each third linear flow channel f penetrates the outer wall of the motorized spindle at least at one end.

[0085] In the above example, the third circumferential cooling branch section 12a is connected by two or more third linear flow channels f, so that the third circumferential cooling branch section 12a can be machined by drilling holes in the outer wall of the motorized spindle. Compared with the prior art which forms a circumferential cooling flow channel by using two parts in a sleeve joint, the present application directly machines a circumferential cooling flow channel on a part by drilling, without the need for cooperation with other parts, thereby simplifying the part machining process and reducing the number of parts and machining costs.

[0086] It should be noted that the penetration hole of each third linear flow channel f formed in the outer wall of the motorized spindle can be closed by a closure member to allow the cooling medium to flow in the third circumferential cooling branch section 12a. In a specific application example, the third circumferential cooling branch section 12a can be connected by four third linear flow channels f in sequence to form a quadrilateral structure. The third circumferential cooling branch section 12a and the first circumferential cooling branch section 10a can be distributed at an angle of 45 degrees in the circumferential direction of the front bearing seat 1.

[0087] In some embodiments, the number of third circumferential cooling branch sections 12a can be two or more, and each third circumferential cooling branch section 12a is arranged in the axial direction of the front bearing seat 1 in sequence, so that the cooling effect in the circumferential direction of the front bearing seat 1 can be improved. Each third circumferential cooling branch section 12a is connected through each third cooling branch section e, and forms a parallel structure, so that the circumferential cooling efficiency is higher.

[0088] To achieve the effect that each third cooling branch section e is communicated with the third circumferential cooling branch section 12a, in some embodiments, as shown in Figure 11 and Figure 12 each two adjacent third linear flow passages f in the third circumferential cooling branch section 12a intersect to form a second intersection g. The number of second intersections g is equal to the number of third cooling branch sections e, and each second intersection g corresponds to one third cooling branch section e. Each third cooling branch section e is communicated with the third circumferential cooling branch section 12a through the corresponding second intersection g.

[0089] In the above example, the third cooling branch section e can be machined at the second intersection g of each two adjacent third linear flow passages f in the third circumferential cooling branch section 12a, and the communication between each third cooling branch section e and the third circumferential cooling branch section 12a can be achieved.

[0090] In some embodiments, the third cooling flow passage 3a further has a sleeve cooling branch section on the sleeve 2, which is in series with the cooling branch section of the third cooling flow passage 3a on the front bearing seat 1. The third cooling flow passage 3a further has a cooling medium outflow section 56, which is in series with the sleeve cooling branch section, and the third cooling flow passage 3a can flow through the rear bearing seat 55 through the cooling medium outflow section 56.

[0091] In the above example, the cooling medium outflow section 56 of the third cooling flow passage 3a and the second circumferential cooling branch section 11a of the second cooling flow passage 2a cooperate, so that both the third cooling flow passage 3a and the second cooling flow passage 2a can cool the rear bearing seat 55.

[0092] In some embodiments, as shown in Figure 10 the sleeve cooling branch section comprises circumferential annular flow passages arranged on the outer surface of the sleeve 2, the number of circumferential annular flow passages is two or more, and the circumferential annular flow passages are arranged in sequence and spaced along the axial direction of the sleeve 2, and a shoulder is formed between each two adjacent circumferential annular flow passages. Each shoulder is provided with a water passage connecting the adjacent two circumferential annular flow passages, and the water passages on the adjacent two shoulders are arranged staggered in the circumferential direction of the sleeve 2. In a specific application example, each water passage extends in the circumferential direction of the sleeve 2, and each water passage corresponds to a central angle of 180 degrees.

[0093] It should be noted that, as shown in Figure 10 the outer side of the sleeve 2 can be sleeved with a cooling water jacket 96, which can ensure the flow of the cooling medium in the sleeve cooling branch section.

[0094] In a specific application example, as shown in Figure 10As shown, the third cooling flow channel 3a has a third cooling medium inlet 3 which can be arranged on the radial surface of the front bearing seat 1, and a third cooling medium outlet 59 arranged on the pipeline disc 57.

[0095] In some embodiments, the present application also provides an electric spindle which can include the cooling structure for electric spindle according to any one of the above. Since the electric spindle adopts the cooling structure, the cooling flow channels are not connected to each other, and each cooling flow channel receives external cooling medium through a different cooling medium inlet, so that the electric spindle can selectively operate part or all of the cooling flow channels under different heat conditions to adapt to the heat demand of the electric spindle, so as to achieve the purpose of adjusting the cooling capacity of the cooling structure.

[0096] For the convenience of understanding, the overall structure of the present application is described below, and the working principle is described.

[0097] In a specific application example, the present application has three cooling flow channels which are not connected to each other, namely the first cooling flow channel 1a, the second cooling flow channel 2a and the third cooling flow channel 3a. The first cooling flow channel 1a can cool the front bearing seat 1 and can realize ring spray cooling. The second cooling flow channel 2a can cool the rear bearing seat 55. The third cooling flow channel 3a can cool the front bearing seat 1, the rear bearing seat 55 and the shaft sleeve 2.

[0098] The first cooling flow channel 1a, the second cooling flow channel 2a and the third cooling flow channel 3a are described in detail below.

[0099] I. The first cooling flow channel 1a can cool the front bearing seat 1 and can realize ring spray cooling.

[0100] As shown in FIG. 1, the first cooling flow channel 1a can be arranged on the front bearing seat 1, and the first cooling medium inlet 1 and the first cooling medium outlet 5 can be arranged on the pipeline disc 57. Figure 3 and Figure 8As shown, the cooling medium flows from the first cooling medium inlet 66 of the front bearing seat 1 into the first flow channel 67, and then reaches the first intersection 68, and enters the second flow channel 69, the third flow channel 72 and the fourth flow channel 73 respectively; the cooling medium entering the second flow channel 69 reaches the second intersection 70, and enters the second flow channel 69 (straight), the third flow channel 72 and the fourth flow channel 73 respectively; the cooling medium entering the third flow channel 72 and the fourth flow channel 73 reaches the third intersection 74 and the fourth intersection 75 respectively, and then flows along the fifth flow channel 100 and the sixth flow channel 101, the seventh flow channel 76 and the eighth flow channel 77 respectively, and then the seventh flow channel 76 and the eighth flow channel 77 converge at the fifth intersection 78; similarly, the cooling medium reaching the second intersection 70 enters two flow channels similar to the third flow channel 72 and the fourth flow channel 73, and then reaches a place similar to the third intersection 74 and the fourth intersection 75 respectively, and then converges with the aforementioned axial fifth flow channel 100 and the sixth flow channel 101 while flowing along the seventh flow channel 76 and the eighth flow channel 77, and converges at the sixth intersection 80; then, the cooling medium entering the second flow channel 69 straightly reaches the seventh intersection 71, and then enters the ninth flow channel 82 and the tenth flow channel 83 respectively, and then converges with the axial fifth flow channel 100 and the sixth flow channel 101 at the eighth intersection 84 and the ninth intersection 85 respectively, and then enters the eleventh flow channel 86 and the twelfth flow channel 87 respectively, and converges at the tenth intersection 81. Then, the cooling medium converging at the fifth intersection 78, the sixth intersection 80 and the tenth intersection 81 flows out of the front bearing seat 1 along the axial thirteenth flow channel 79 and enters the front end flange 88. The cooling medium entering the front end flange 88 from the axial second flow channel 69, the fifth flow channel 100, the sixth flow channel 101 and the thirteenth flow channel 79 respectively is connected with the groove segments 89 respectively, and finally is sprayed out from the nozzles 90 at the front end of the groove segments 89 respectively, wherein each groove segment 89 is connected with two nozzles. At this time, the cooling medium of the first cooling flow channel ends its journey.

[0101] It should be noted that the second flow channel 69, the thirteenth flow channel 79, the fifth flow channel 100 and the sixth flow channel 101 are the first cooling branch section c. The third flow channel 72, the fourth flow channel 73, the seventh flow channel 76, the eighth flow channel 77, the ninth flow channel 82, the tenth flow channel 83, the eleventh flow channel 86 and the twelfth flow channel 87 are the first straight flow channel b. The first intersection 68, the second intersection 70, the seventh intersection 71, the third intersection 74, the fourth intersection 75, the fifth intersection 78, the sixth intersection 80, the tenth intersection 81, the eighth intersection 84 and the ninth intersection 85 are the first intersection a.

[0102] II. The second cooling flow channel 2a can cool the rear bearing seat 55.

[0103] As Figure 3 , Figure 9As shown, an independent stream of cooling medium enters the cooling medium inlet section 106 from the second cooling medium inlet 104 of the rear pipe plate 57, then enters the 14th flow channel of the rear bearing housing 55, and flows clockwise along the 15th flow channel 112, the 16th flow channel 111, and the 17th flow channel 109 in sequence. The cooling medium then exits the rear bearing housing 55, enters the cooling medium outlet section 105 of the rear pipe plate 57, and finally exits through the second cooling medium outlet 103 of the rear pipe plate 57. At this point, the cooling medium journey in the second cooling channel ends.

[0104] It should be noted that the 14th flow channel, 15th flow channel 112, 16th flow channel 111 and 17th flow channel 109 mentioned above are all the aforementioned second straight flow channel d.

[0105] Third, the third cooling channel 3a can cool the front bearing housing 1, the rear bearing housing 55 and the bushing 2.

[0106] like Figure 3 , Figures 10-12 As shown, an independent stream of cooling medium enters from the third cooling medium inlet 3 of the front bearing housing 1 and begins to flow into the 18th flow channel 4. The cooling medium then reaches the 11th intersection point 5 and enters the 19th flow channel 6, 20th flow channel 9, and 21st flow channel 10 respectively. The cooling medium entering the 19th flow channel 6 reaches the 12th intersection point 7 and enters the 19th flow channel 6 (straight ahead), 20th flow channel 9, and 21st flow channel 10 respectively. The cooling medium entering the 20th flow channel 9 and 21st flow channel 10 reaches the 13th intersection point 11 and the 14th intersection point 12 respectively, and then flows axially into the 22nd flow channel 9. Flow through channels 7 and 23 (98), 24 (13), and 25 (14), then channels 24 (13) and 25 (14) converge at intersection 15. Similarly, the cooling medium reaching intersection 7 enters two other channels similar to channels 20 (9) and 21 (10), reaching points similar to intersections 13 (11) and 14 (12), then intersects with the aforementioned axial channels 22 (97) and 23 (98), and flows along channels similar to channels 24 (13) and 25 (14), converging at intersection 16 (17). Figure 2As shown, the cooling medium entering the 19th flow channel 6 straightly reaches the 17th intersection 8, and then enters the 26th flow channel 60 and the 27th flow channel 61 respectively, and then meets the axial 22nd flow channel 97 and the 23rd flow channel 98 respectively to the 18th intersection 62 and the 19th intersection 63, and then enters the 28th flow channel 64 and the 29th flow channel 65 respectively, and then converges to the 20th intersection 18. Then, the cooling medium converging to the 15th intersection 15, the 16th intersection 17 and the 20th intersection 18 flows along the axial 30th flow channel 16 out of the front bearing seat 1 into the 31st flow channel 19 of the shaft sleeve 2, and then enters the 1st gap flow channel 20, the 2nd gap flow channel 21, the 3rd gap flow channel 22, the 4th gap flow channel 23, the 5th gap flow channel 24, the 6th gap flow channel 25, the 7th gap flow channel 26, the 8th gap flow channel 27, the 9th gap flow channel 28, the 10th gap flow channel 29, the 11th gap flow channel 30, the 12th gap flow channel 31, the 13th gap flow channel 32, the 14th gap flow channel 33, the 15th gap flow channel 34, the 16th gap flow channel 35, the 17th gap flow channel 36, the 18th gap flow channel 37, the 19th gap flow channel 38, the 20th gap flow channel 39, the 21st gap flow channel 40, the 21st gap flow channel 41, the 23rd gap flow channel 42, the 24th gap flow channel 43, the 25th gap flow channel 44, the 26th gap flow channel 45, the 27th gap flow channel 46, the 28th gap flow channel 47, the 29th gap flow channel 48, the 30th gap flow channel 49, the 31st gap flow channel 50, the 32nd gap flow channel 51, the 33rd gap flow channel 52, the 34th gap flow channel 53, the 35th gap flow channel 54 of the shaft sleeve 2 and the cooling water jacket 96 in sequence, and then flows out of the shaft sleeve 2 into the cooling medium outflow section 56 of the rear bearing seat 55, and finally flows out of the rear bearing seat 55 into the flow channel 58 of the rear end pipeline disc 57, and then flows out of the third cooling medium outlet 59 of the rear end pipeline disc 57. At this time, the cooling medium journey of the third cooling flow channel ends.

[0107] It should be noted that the 19th flow channel 6, the 30th flow channel 16, the 22nd flow channel 97 and the 23rd flow channel 98 are all the third cooling branch section e. The 20th flow channel 9, the 21st flow channel 10, the 24th flow channel 13, the 25th flow channel 14, the 26th flow channel 60, the 27th flow channel 61, the 28th flow channel 64 and the 29th flow channel 65 are all the third straight flow channel f. The 11th intersection 5, the 12th intersection 7, the 17th intersection 8, the 13th intersection 11, the 14th intersection 12, the 15th intersection 15, the 16th intersection 17, the 20th intersection 18, the 18th intersection 62 and the 19th intersection 63 are all the second intersection g.

[0108] It is easy for those skilled in the art to understand that the advantageous technical features of the above-mentioned modes can be freely combined and superimposed without conflict.

[0109] The above merely describes preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above merely describes preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A cooling structure for an electric spindle, characterized in that: It includes two or more unconnected cooling channels, each of which is disposed on the electric spindle, and each of which receives external cooling medium through different cooling medium inlets; Each of the cooling channels includes a first cooling channel (1a), a second cooling channel (2a), and a third cooling channel (3a). The third cooling channel (3a) flows through both the front bearing housing (1) and the rear bearing housing (55) of the electric spindle. The first cooling channel (1a) flows through the front bearing housing (1), and the second cooling channel (2a) flows through the rear bearing housing (55). The first cooling channel (1a) is used to cool the front bearing housing (1) of the two bearing housings (1 and 55). The second cooling channel (2a) is used to cool the rear bearing housing (55) of the two bearing housings (1 and 55). The third cooling channel (3a) is used to cool both the front bearing housing (1) and the rear bearing housing (55). The first cooling channel (1a) has a first cooling medium inlet (66), and the first cooling channel (1a) has two or more parallel first cooling branch sections (c). One end of each first cooling branch section (c) is connected to the first cooling medium inlet (66), and the other end of each first cooling branch section (c) is connected to a nozzle (90). Each nozzle (90) is used to be installed at the front end of the electric spindle to spray cooling medium onto the tool. And / or, the first cooling channel (1a) has a first circumferential cooling branch section (10a), which is formed by connecting two or more first straight channels (b) in sequence. Each first straight channel (b) is arranged in sequence along the circumference of the electric spindle, and each first straight channel (b) penetrates the outer wall of the electric spindle at least at one end.

2. The cooling structure for an electric spindle according to claim 1, characterized in that: When the first cooling channel (1a) has two or more parallel first cooling branch sections (c), and the other end of each first cooling branch section (c) is connected to a nozzle (90), the other end of each first cooling branch section (c) is connected to the corresponding nozzle (90) through different connecting groove sections (89); wherein, each connecting groove section (89) extends along the circumference of the electric spindle, and each connecting groove section (89) is connected to two or more nozzles (90) arranged sequentially along the circumference of the electric spindle; and each nozzle (90) is arranged around the electric spindle.

3. The cooling structure for an electric spindle according to claim 1 or 2, characterized in that: When the first cooling channel (1a) has two or more parallel first cooling branch sections (c), and the first cooling channel (1a) has a first circumferential cooling branch section (10a), the first circumferential cooling branch section (10a) extends circumferentially along the electric spindle; the first circumferential cooling branch section (10a) is formed by two or more first straight-line channels (b) connected sequentially, and each first straight-line channel (b) penetrates at least one end through the outer wall of the electric spindle, Each of the first cooling branch sections (c) extends along the axial direction of the electric spindle, and each of the first cooling branch sections (c) is arranged sequentially at intervals in the circumferential direction of the electric spindle; each of the first cooling branch sections (c) is connected through the first circumferential cooling branch section (10a).

4. The cooling structure for an electric spindle according to claim 1 or 2, characterized in that: Within the first circumferential cooling branch section (10a), each pair of adjacent first straight flow channels (b) intersect to form a first junction (a). The number of first junctions (a) is equal to the number of first cooling branch sections (c), and they correspond one-to-one. Each first cooling branch section (c) is connected to the first circumferential cooling branch section (10a) through the corresponding first junction (a).

5. The cooling structure for an electric spindle according to claim 1 or 2, characterized in that: When the first cooling channel (1a) has two or more parallel first cooling branch sections (c), each of the first cooling branch sections (c) is disposed on the front bearing seat (1) of the electric spindle; When the first cooling channel (1a) has a first circumferential cooling branch section (10a), the first circumferential cooling branch section (10a) is disposed on the front bearing housing (1) of the electric spindle.

6. The cooling structure for an electric spindle according to claim 1, characterized in that: The second cooling channel (2a) has a second circumferential cooling branch section (11a), which is formed by two or more second straight channels (d) connected in series. Each second straight channel (d) is arranged in sequence along the circumference of the electric spindle. At least one end of each second straight channel (d) penetrates the outer wall of the electric spindle, and the openings of each second straight channel (d) on the outer wall of the electric spindle are all closed by a sealing member. The second cooling channel (2a) further includes a cooling medium inlet section (106) and a cooling medium outlet section (105). Both the cooling medium inlet section (106) and the cooling medium outlet section (105) extend along the axial direction of the electric spindle, and one of them is connected in series at one end of the second circumferential cooling branch section (11a), while the other of them is connected in series at the other end of the second circumferential cooling branch section (11a).

7. The cooling structure for an electric spindle according to any one of claims 1-2 and 6, characterized in that: At least a portion of each of the cooling channels flows through the same component of the electric spindle.

8. The cooling structure for an electric spindle according to claim 7, characterized in that: When the first cooling channel (1a) has two or more parallel first cooling branch sections (c), each of the first cooling branch sections (c) extends along the axial direction of the electric spindle, and each of the first cooling branch sections (c) is arranged sequentially at intervals in the circumferential direction of the electric spindle, The third cooling channel (3a) has two or more third cooling branch sections (e) extending axially along the electric spindle. Each of the third cooling branch sections (e) and each of the first cooling branch sections (c) are arranged alternately in the circumferential direction of the front bearing housing (1). The first cooling channel (1a) can flow through each of the first cooling branch sections (c) through the front bearing housing (1), and the third cooling channel (3a) can flow through each of the third cooling branch sections (e) through the front bearing housing (1).

9. The cooling structure for an electric spindle according to claim 8, characterized in that: The third cooling channel (3a) has a third circumferential cooling branch section (12a), and each of the third cooling branch sections (e) is connected through the third circumferential cooling branch section (12a); wherein, the third circumferential cooling branch section (12a) is formed by connecting two or more third straight-line channels (f) in sequence, each of the third straight-line channels (f) is arranged in sequence along the circumference of the front bearing housing (1), and each of the third straight-line channels (f) penetrates the outer wall of the electric spindle at least at one end.

10. The cooling structure for an electric spindle according to claim 9, characterized in that: Within the third circumferential cooling branch section (12a), each pair of adjacent third straight-line flow channels (f) intersect to form a second junction (g). The number of second junctions (g) is equal to the number of the third cooling branch sections (e), and they correspond one-to-one. Each third cooling branch section (e) is connected to the third circumferential cooling branch section (12a) through the corresponding second junction (g).

11. The cooling structure for an electric spindle according to claim 7, characterized in that: The third cooling channel (3a) has a bushing cooling branch section located on the bushing (2) of the electric spindle, and the bushing cooling branch section is connected in series with the cooling branch section of the third cooling channel (3a) on the front bearing housing (1). The third cooling channel (3a) also has a cooling medium outlet section (56), which is connected in series with the bushing cooling branch section, and the third cooling channel (3a) section can flow through the rear bearing housing (55) through the cooling medium outlet section (56).

12. An electric spindle, characterized in that: The cooling structure for an electric spindle includes any one of claims 1-11.

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