Improved motorized spindle structure

Abstract

The utility model relates to an improved motorized spindle structure which comprises a steel cylinder, a rotating shaft penetrates into the steel cylinder, a motor rotor and a motor stator are arranged between the rotating shaft and the inner wall of the steel cylinder, a cooling water channel is arranged on the wall body of the steel cylinder, and the cooling water channel comprises a plurality of axial water channel sets and a plurality of transfer water channels; each axial water channel group comprises at least two parallel axial water channels, the axial water channels axially extend from one end of the steel cylinder to the other end of the steel cylinder, the transfer water channels are respectively arranged at two ends of the steel cylinder, and each transfer water channel is only communicated with two adjacent axial water channel groups; wherein the two axial water channel sets serve as a water inlet channel and a water outlet channel respectively, and cooling water flowing in from the water inlet channel enters the water outlet channel after passing through the whole cooling water channel. According to the technical scheme, the circulation amount of the cooling water in the cooling water channel is increased, and the contact area of the cooling water and the wall body of the steel cylinder is increased, so that the heat dissipation effect is improved, and long-time operation of the motorized spindle can be maintained.

Description

Technical Field

[0001] The present application relates to an electric spindle, and more particularly to an improved electric spindle structure. Background Art

[0002] The electric spindle of CNC machine tools is the core of the development of CNC machine tool technology. The electric spindle has the advantages of compact structure, low vibration, low noise, high dynamic precision and good stability. The electric spindle is equipped with a motor rotor and a motor stator. The heat generated when rotating at high speed is very high. The heat generated needs to be dissipated in time to avoid overheating. The motor rotor and the motor stator are usually located inside a steel cylinder, so a steel cylinder is needed for heat dissipation. A cooling water channel is opened on the wall of the steel cylinder, and cooling water is input from the water inlet. After the cooling water enters the cooling water channel, it is finally output from the water outlet. The steel cylinder is usually equipped with a cooling water channel, and its heat dissipation effect is relatively general and needs to be improved. Utility Model Content

[0003] The purpose of the present application is to overcome the above-mentioned deficiencies of the prior art and provide an improved electric spindle structure to enhance the heat dissipation effect.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solutions: an improved electric spindle structure, which includes a steel cylinder, a rotating shaft is inserted into the steel cylinder, a motor rotor and a motor stator are arranged between the rotating shaft and the inner wall of the steel cylinder, and a cooling water channel is arranged on the wall of the steel cylinder. The cooling water channel includes a plurality of axial water channel groups and a plurality of transfer water troughs; each group of axial water channel groups includes at least two parallel axial water channels, and the axial water channels extend axially from one end of the steel cylinder to the other end of the steel cylinder. The transfer water troughs are respectively arranged at both ends of the steel cylinder, and each transfer water trough is only connected to two adjacent groups of axial water channel groups; the two groups of axial water channel groups serve as an inlet and a drain respectively, and the cooling water flowing in from the inlet passes through the entire cooling water channel and enters the drain.

[0005] Compared with the prior art, the beneficial effects of the present application are as follows: multiple groups of axial water channel groups are arranged in the steel cylinder wall, the axial water channel groups are connected by a transfer water trough, each group of axial water channel groups includes at least two axial water channels, the flow rate of cooling water in the cooling water channel is increased, and the contact area between the cooling water and the steel cylinder wall is increased, so the heat dissipation effect is enhanced and improved, which is conducive to maintaining the long-term operation of the electric spindle.

[0006] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a cross-sectional view of the electric spindle.

[0008] Figure 2 Expanded view of the steel cylinder of the electric spindle.

[0009] Figure 3 This is a view from the rear end of the steel cylinder of the electric spindle.

[0010] Figure 4 for Figure 1 A magnified view of area A.

[0011] Figure 5 This is a rear-end view of the dust ring.

[0012] Figure 6 This is a cross-sectional view of the electric spindle.

[0013] Figure 7 This is the front view of the back cover.

[0014] Figure 8 This is a three-dimensional view of the rear bearing seat.

[0015] It should be noted that the products shown in the above views have been appropriately reduced / enlarged to suit the size of the drawings and for clarity of the views, and there is no restriction on the size of the products shown in the views. DETAILED DESCRIPTION

[0016] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0017] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0018] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0019] The embodiment of the present application is an electric spindle structure, and its specific structure is as follows Figure 1-8 The front end direction of the electric spindle is Figure 1 The Z direction is opposite to the rear end direction.

[0020] like Figure 1As shown, the electric spindle structure includes a steel cylinder 10, a rotating shaft 20 is inserted into the steel cylinder 10, and a motor rotor 91 and a motor stator 92 are arranged between the rotating shaft 20 and the inner wall of the steel cylinder 10. When the rotating shaft 20 rotates, the rotating shaft 20 and the motor rotor 91 rotate synchronously, and the heat generated will be transferred to the steel cylinder 10, which needs to be dissipated and cooled by the steel cylinder 10. Figure 2 As shown, a cooling water channel is provided in the wall of the steel cylinder 10, and the cooling water channel includes a plurality of axial water channel groups 110 and a plurality of transfer water tanks 12. Specifically, there are 8 axial water channel groups and 7 transfer water tanks 12. The transfer water tanks 12 are respectively provided at both ends of the steel cylinder 10, and each transfer water tank 12 is only connected to two adjacent axial water channel groups 110. Each transfer water tank 12 is provided with a sealing cover plate 121 to prevent the cooling water from flowing out. Figure 2 In the example, each axial water channel group 110 includes two parallel axial water channels 11 , and the axial water channels 11 extend axially from one end of the steel cylinder 10 to the other end of the steel cylinder 10 . Figure 2 The two outermost axial water channel groups 110 are used as the water inlet channel 13 and the water discharge channel 14 respectively. The cooling water flowing in from the water inlet channel 13 flows through the entire cooling water path and then enters the water discharge channel 14. That is, the cooling water in the water inlet channel 13 flows through the entire cooling water path. Figure 2 All axial water channels 11 and transfer water tanks 12 between the water inlet channel 13 and the water outlet channel 14 ensure that the cooling water has sufficient contact area and contact time with the steel cylinder 10 to ensure the heat dissipation effect. Figure 3 As shown, the axial waterway group 110 is distributed around the center of the steel cylinder 10, the intervals between adjacent axial waterway groups 110 are basically the same, and the transfer tank 12 is arc-shaped. The interval between the water inlet 13 and the drainage channel 14 is large, the purpose is to leave space for the air inlet 19.

[0021] In other embodiments, each axial water channel set 110 may also include more than two axial water channels 11 .

[0022] In some embodiments, in combination Figure 1 and Figure 4 As shown, the electric spindle structure also includes a dust ring 31, which is arranged at the front end of the electric spindle, and the rotating shaft 20 passes through the dust ring 31. The dust ring 31 is made of stainless steel to avoid rust and corrosion. Figure 4 As shown, a waterproof cover 32 and a dust cover 33 are provided between the dust ring 31 and the rotating shaft 20. The waterproof cover 32 and the dust cover 33 are both fixedly connected to the rotating shaft 20, and the waterproof cover 32 is provided at the front end of the dust cover 33. Figure 4As shown, the dustproof ring 31 is provided with an air inlet 311, an air storage groove 312, an outer ring groove 313 and an inner ring groove 314. The air inlet 311 is used to introduce compressed gas. The air inlet 311 is connected to the air inlet 19 on the inner wall of the steel cylinder 10. The compressed air flows from the air inlet 19 to the air inlet 311. The air storage groove 312 connects the air inlet 311 and the outer ring groove 313. The air storage groove 312 is used to store air and adjust the front air pressure, which ensures the stability of the air seal pressure to a certain extent. Figure 4 and Figure 5 As shown, the outer annular groove 313 is provided on the rear end face of the dust ring 31, and the inner annular groove 314 is provided on the inner wall of the dust ring 31 facing the dust cover 33. The outer annular groove 313 is connected to the inner annular groove 314 through 10 through holes 315 evenly distributed around the central axis of the dust ring 31, so as to ensure uniform discharge of compressed gas. Figure 4 As shown, an air-sealing gap 316 is left between the inner wall of the dustproof ring 31 and the outer walls of the dustproof cover 33 and the waterproof cover 32, and the inner ring groove 314 is connected to the air-sealing gap 316. The compressed gas passes through the air inlet 311, the air storage groove 312, the outer ring groove 313, the through hole 315, and the inner ring groove 314 in sequence, and finally enters the air-sealing gap 316 to achieve an air-sealing effect and prevent external dust, impurities, etc. from entering the interior of the electric spindle. In addition, as Figure 4 As shown, the outer wall of the dust cover 33 is provided with a water-shedding groove 331 , the outer wall of the waterproof cover 32 is provided with a water-shedding groove 321 , and the inner wall of the dust ring 31 is provided with a water-retaining groove 317 .

[0023] In some embodiments, in combination Figure 1 and Figure 4 As shown, the electric spindle structure also includes a front bearing assembly 41, a bearing pressure plate 43 and a front bearing seat 42. The front bearing seat 42 is fixed to the front end of the steel cylinder 10 and the rotating shaft 20 passes through the front bearing seat 42. The front bearing assembly 41 is fixed between the front bearing seat 42 and the rotating shaft 20. The dust ring 31 is fixed to the front end of the front bearing seat 42, and the bearing pressure plate is sandwiched between the dust ring 31 and the front bearing assembly. Specifically, as shown in FIG. Figure 4 As shown, the bearing pressure plate 43 is provided with an inner convex ring 431, and the dust cover 33 is provided with an outer convex ring 332. The outer convex ring 332 is inserted into the annular groove 432 on the outer side of the inner convex ring 431, and the inner convex ring 421 is inserted into the annular groove 333 on the inner side of the outer convex ring 332. A labyrinth gas seal gap 330 is formed between the bearing pressure plate 43 and the dust cover 33. The labyrinth gas seal gap 330 is connected to the inner annular groove 314, so the compressed gas will also enter the labyrinth gas seal gap 330 from the inner annular groove 314, which can prevent dust, impurities, etc. from entering the front bearing group 41, thereby improving the sealing effect.

[0024] In some embodiments, Figure 6As shown, the electric spindle structure also includes a rear bearing assembly 52 and a rear bearing seat 51. The rear bearing seat 51 is fixed to the rear end of the steel cylinder 10. The rotating shaft 20 passes through the rear bearing seat 51, and the rear bearing assembly 52 is fixed between the rear bearing seat 51 and the rotating shaft 20. A bearing pressure ring 53 is fixed on the rotating shaft 20, and the bearing pressure ring 53 presses the rear end of the rear bearing assembly 52, and the preload disc 54 presses against the front end of the rear bearing assembly 52, thereby fixing the rear bearing assembly 52 front and back. Figure 6 As shown, an encoding gear 61 is also fixed on the rotating shaft 20, and an encoder 62 is installed and fixed on the rear bearing seat 51. The detection end of the encoder 62 faces the encoding gear 61. The encoder 62 and the encoding gear 61 are used to measure the rotation speed and number of revolutions of the rotating shaft 20. Figure 6 As shown, a fixing nut 63 for fixing the encoding gear 61 is screwed into the rear end of the rotating shaft 20, and an annular air-avoiding groove 611 is provided on the rear end surface of the encoding gear 61, and the front end of the fixing nut 63 is placed in the air-avoiding groove 611 and the fixing nut 63 is pressed against the encoding gear 61. A cylindrical extension section 612 is provided at the front end of the encoding gear 61, and the cylindrical extension section 612 abuts against the bearing pressure ring 53.

[0025] In addition, if Figure 8 As shown, the rear bearing seat 51 is provided with a mounting position 510 for the encoder 62. Figure 6 and Figure 7 As shown, the electric spindle structure also includes a back cover 70, which is fixed to the rear end of the rear bearing seat 51, and the back cover 70 is provided with a clearance position 71 for avoiding the encoder 62. Figure 1 As shown, a front air duct 75 is provided in the rear bearing seat 51 and the back cover 70, and the front air duct 75 is connected to the air inlet duct 19 of the steel cylinder 10. An air inlet connector 72 is provided on the side wall of the back cover 70, and the air inlet connector 72 is connected to the front air duct 75 of the back cover 70.

[0026] In the electric spindle structure of the above embodiment, multiple groups of axial water channel groups 110 are arranged in the wall of the steel cylinder 10, and the axial water channel groups 110 are connected through the transfer water tank 12. Each group of axial water channel groups 110 includes at least two axial water channels 11. The flow rate of cooling water in the cooling water channel is improved, and the contact area between the cooling water and the wall of the steel cylinder 10 is increased. Therefore, the heat dissipation effect is improved, which is conducive to maintaining the long-term operation of the electric spindle.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0029] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0030] The above examples are only used to further illustrate the technical content of this application so that readers can understand it more easily, but they do not mean that the implementation methods of this application are limited to these. Any technical extension or re-creation made based on this application is protected by this application. The scope of protection of this application shall be subject to the claims.

Claims

1. An improved electric spindle structure, comprising a steel cylinder, a rotating shaft passing through the steel cylinder, a motor rotor and a motor stator arranged between the rotating shaft and the inner wall of the steel cylinder, characterized in that: The steel cylinder wall is provided with a cooling water channel, which includes a plurality of axial water channel groups and a plurality of transfer water tanks; Each group of the axial water channel groups includes at least two parallel axial water channels, and the axial water channels extend axially from one end of the steel cylinder to the other end of the steel cylinder. The transfer water tanks are respectively arranged at both ends of the steel cylinder, and each transfer water tank only connects two adjacent groups of axial water channel groups; The two axial water channel groups serve as an inlet channel and a drain channel respectively. The cooling water flowing in from the inlet channel passes through the entire cooling water channel and then enters the drain channel.

2. The improved electric spindle structure according to claim 1, characterized in that: Each of the transfer water tanks is provided with a sealing cover plate.

3. The improved electric spindle structure according to claim 1, characterized in that: There are 8 axial water channel groups and 7 transfer water tanks.

4. The improved electric spindle structure according to claim 1, characterized in that: The electric spindle structure also includes a dustproof ring, which is arranged at the front end of the electric spindle. The rotating shaft passes through the dustproof ring. A waterproof cover and a dustproof cover are arranged between the dustproof ring and the rotating shaft. The waterproof cover and the dustproof cover are fixedly connected to the rotating shaft. The waterproof cover is arranged at the front end of the dustproof cover.

5. The improved electric spindle structure as claimed in claim 4, characterized in that: The dustproof ring is provided with an air inlet, an air storage groove, an outer ring groove and an inner ring groove. The air inlet is used to introduce compressed gas. The air storage groove is connected with the air inlet and the outer ring groove. The outer ring groove is arranged on the rear end surface of the dustproof ring. The inner ring groove is arranged on the inner wall of the dustproof ring facing the dustproof cover. The outer ring groove is connected with the inner ring groove through a plurality of through holes evenly distributed around the central axis of the dustproof ring. An air-sealing gap is left between the inner wall of the dustproof ring and the outer walls of the dustproof cover and the waterproof cover, and the inner ring groove is connected with the air-sealing gap.

6. The improved electric spindle structure as claimed in claim 5, characterized in that: The outer walls of the dustproof cover and the waterproof cover are respectively provided with water-shedding grooves, and the inner wall of the dustproof ring is provided with a water-retaining groove.

7. The improved electric spindle structure as claimed in claim 5, characterized in that: The electric spindle structure also includes a front bearing group, a bearing pressure plate and a front bearing seat. The front bearing seat is fixed at the front end of the steel cylinder and the rotating shaft passes through the front bearing seat. The front bearing group is fixed between the front bearing seat and the rotating shaft. The dust ring is fixed at the front end of the front bearing seat. The bearing pressure plate is clamped between the dust ring and the front bearing group. The bearing pressure plate is provided with an inner convex ring, and the dust cover is provided with an outer convex ring. The outer convex ring is inserted into the annular groove on the outer side of the inner convex ring, and the inner convex ring is inserted into the annular groove on the inner side of the outer convex ring. A labyrinth air seal gap is formed between the bearing pressure plate and the dust cover, and the labyrinth air seal gap is connected to the inner ring groove.

8. The improved electric spindle structure as claimed in claim 1, characterized in that: The electric spindle structure also includes a rear bearing group and a rear bearing seat. The rotating shaft passes through the rear bearing seat. The rear bearing group is fixed between the rear bearing seat and the rotating shaft. A bearing pressure ring is fixed on the rotating shaft, and the bearing pressure ring tightly presses the rear end of the rear bearing group. An encoding gear is also fixed on the rotating shaft, and an encoder is installed and fixed on the rear bearing seat. The detection end of the encoder faces the encoding gear.

9. The improved electric spindle structure as claimed in claim 8, characterized in that: A fixing nut for fixing the encoding gear is screwed into the rear end of the rotating shaft, and an annular air avoidance groove is provided on the rear end surface of the encoding gear. The front end of the fixing nut is placed in the air avoidance groove and the fixing nut is pressed against the encoding gear.

10. The improved electric spindle structure as claimed in claim 8, characterized in that: The electric spindle structure also includes a back cover, which is fixed to the rear end of the rear bearing seat, and the back cover is provided with an avoidance position for avoiding the encoder.

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