Multifunctional telescopic servo waterwheel electric spindle

Abstract

The invention relates to the technical field of numerical control machine tools, in particular to a multifunctional telescopic servo waterwheel electric spindle, which is non-contact waterproof, dustproof and sealed, and can quickly and comprehensively cool the heat of a tool and a workpiece during a cutting process, thereby improving the surface processing quality of the workpiece and extending the life of the tool; the spindle comprises a sleeve, a spindle, a stator and rotor assembly, an electric spindle encoder and a cooling system, a front bearing group and a rear bearing group are respectively installed at the front and rear of the spindle, the front bearing group and the rear bearing group together with the sleeve and the bearing end covers at both ends of the sleeve constitute an integral sealed cavity, a waterproof cover is fixed on the spindle and can rotate with the spindle, the waterproof cover and the front pressure cover groove form a labyrinth waterproof structure, an air-sealed annular groove and a labyrinth sealing groove are arranged between the waterproof cover and the front pressure cover, and the cooling system comprises coolant channels evenly arranged on the sleeve and eight cooling nozzles arranged on the box body.

Description

Technical Field

[0001] The invention relates to the technical field of numerically controlled machine tools, in particular to a multifunctional telescopic servo waterwheel electric spindle. Background Art

[0002] As we all know, the electric spindle is an integrated spindle unit with a high-speed motor built into the spindle box. The motor's rotor drives the spindle to rotate together, realizing mechatronics. Traditional electric spindles are used at the front end of machine tool spindles, and the bearings and stators and rotors inside are strictly required to be water-proof.

[0003] Most of the servo water wheel spindles on the market use external motors and transmission belts for transmission. The transmission structure is complex, occupies a large volume, has poor stability, and the parts are easy to break, making replacement troublesome. In addition, when an ordinary electric spindle with a stator is working, a large amount of heat will be generated due to the eddy currents of the stator, the high-speed operation of the bearings, and the frequent and repeated expansion and contraction friction of the sleeve. If the heat cannot be dissipated in time, it will not only cause a sharp temperature rise and thermal deformation, affecting the maximum speed that the electric spindle can reach, but also the thermal deformation will cause changes in the rotation accuracy and feed accuracy, and will also cause damage to the bearings. Therefore, it is necessary to ensure the cooling of the stator, bearings, and sleeves during the processing process.

[0004] Most of the servo waterwheel spindles and electric spindles with stators on the market use a labyrinth (ordinary) sealing structure. However, the labyrinth seal is very poor when running at low speeds. In addition, the gap between the spindle and the end cover of the ordinary spindle is large, resulting in poor labyrinth sealing effect. Summary of the invention

[0005] 1. Technical issues to be solved

[0006] In view of the deficiencies in the prior art, the present invention provides a non-contact waterproof, dustproof, sealed, and multifunctional telescopic servo water wheel electric spindle which can quickly and comprehensively cool the heat of the tool and the workpiece as well as the cooling of its own sleeve and box body during the processing, thereby improving the surface processing quality of the workpiece and extending the life of the tool and the electric spindle of the present invention. The motor is built into the sleeve of the spindle, and the structure is more precise, the size is small, the transmission structure is simpler, and the working efficiency is higher.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a multifunctional telescopic servo water wheel electric spindle, comprising a housing, a sleeve, a spindle, a stator-rotor assembly, an electric spindle encoder, an electric spindle unit cooling system and an annular spray cooling system on the housing, the front and rear of the spindle are respectively installed with a front bearing group and a rear bearing group, a front pressure cover is arranged on the front bearing group, the sleeve and the front pressure cover located at the front end of the sleeve and the push plate at the rear end together constitute an integral sealing chamber, the stator-rotor assembly is installed between the front bearing group and the rear bearing group, and the stator-rotor assembly is connected to the spindle and can drive the spindle to rotate, the front bearing group is provided with a front pressure cover, and a waterproof cover is clamped on one side of the front pressure cover through a chuck locating pin, the waterproof cover is fixed on the spindle and can As the spindle rotates, the protruding edge designed on the waterproof cover forms a double maze with the inner and outer sides, so that the waterproof cover can block a large amount of cutting fluid. The electric spindle encoder is installed on the shaft wall diameter of the electric spindle, and the front pressure cover and the sleeve are fixed by a hollow hexagon socket screw and multiple hexagon socket screws, and anti-leakage O-ring seals are provided between the sleeve and the front pressure cover and the push plate. The cooling system includes coolant channels evenly arranged on the sleeve and eight cooling nozzles arranged on the box body. During work, the coolant and cooling gas pass through the cooling channels on the box body and then cool the workpiece through the nozzles, and the box body itself is also cooled. Coolant inlets and high-pressure universal nozzles are respectively provided on both sides of the coolant channel.

[0009] Preferably, the double labyrinth sealing structure includes an air-sealed annular groove and a labyrinth sealing groove arranged between the waterproof cover and the front pressure cover, an intercepting groove and a drainage hole are arranged around the labyrinth sealing groove, and a plug is arranged between the intercepting groove and the drainage hole, and the gap between the protruding edge of the waterproof cover and the groove of the front pressure cover is 0.05mm.

[0010] Preferably, the double labyrinth sealing structure includes an inclined annular groove designed at the contact point between the waterproof cover and the bottom of the front pressure cover, a water-throwing groove is provided between the waterproof cover and the main shaft, and the water-throwing groove corresponds to the intercepting groove on the front pressure cover, and a plurality of drainage outlets are provided below the intercepting groove, and the drainage outlets are communicated with the drainage holes.

[0011] Preferably, the box body is provided with a waste oil drain port and a lubricating oil inlet, and the waste oil drain port can discharge oil from the axial or radial drain port according to the installation direction of the waterwheel electric spindle.

[0012] Preferably, the bearings of the front bearing group and the rear bearing group are angular contact bearings, and single-row cylindrical roller bearings, double-row cylindrical roller bearings, etc. can also be selected according to actual working conditions.

[0013] Preferably, eight groups of coolant channels are provided, and the coolant inlets of the eight groups of coolant channels can be 8 coolant inlets, 8 air inlets, or 4 liquid and 4 air inlets.

[0014] Preferably, a push plate is provided at the rear end of the sleeve on the bearing end cover of the sleeve, and the push plate is provided with a sleeve cooling inlet, a sleeve cooling outlet, an air seal inlet, an encoder aviation socket and a power aviation socket, and the encoder aviation socket and the power aviation socket are both located behind the push plate, and an electric spindle encoder is installed on the shaft wall of the electric spindle.

[0015] Preferably, the front gland and the sleeve are fixed by 7+1 hollow hexagon socket screws.

[0016] Preferably, the push plate is provided with a first channel, a second channel and a third channel at the bottom, and a process hole is provided on each side of the push plate. The first channel and the third channel are connected to the cooling inlet and the cooling outlet through the process holes on the side of the push plate respectively, and the second channel is connected to the airtight seal inlet.

[0017] Preferably, the spindle front end interface can be provided with NT, BT, HSK, ER spreader structure.

[0018] (III) Beneficial effects

[0019] Compared with the prior art, the present invention provides a multifunctional telescopic servo waterwheel electric spindle, which has the following beneficial effects:

[0020] 1. The multifunctional telescopic servo waterwheel electric spindle can block a large amount of cutting fluid through the waterproof cover. The waterproof cover and the pressure cover groove form a labyrinth waterproof structure, and the gap between the protruding flange of the waterproof cover and the pressure cover groove is 0.05mm, which is relatively small, so the probability of water and dust entering is very low, and the waterproof and dustproof effects are relatively good; at the same time, the gas cavity designed in the front cover is entered through the hollow hexagon socket screw to gather gas, and then enters the designed O-shaped annular groove through the small air hole to form an annular gas sealing ring, which effectively prevents a small amount of dust and liquid that may enter from entering the spindle.

[0021] 2. The multifunctional telescopic servo waterwheel electric spindle has 8 ring-spray cooling channels circumferentially distributed around the outer periphery of the box body hole, so that the coolant can take away the heat caused by friction when passing through the 8 cooling channels, dissipate the heat of the box body, reduce the thermal deformation of the box body, improve the processing accuracy, and ensure the processing stability. At the same time, the coolant can flush the tool and the workpiece during the cutting process, so that the dust and oil mist are integrated with the coolant and finally discharged together with the coolant, achieving the best dust reduction and oil mist removal effect.

[0022] 3. The coolant cools the tool and the workpiece through the rotary joint and the hollow pull rod passing through the spindle. The tool itself is hollow, and the coolant also cools the tool itself. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention;

[0024] Figure 2 for Figure 1 A top view of a cross section;

[0025] Figure 3 A perspective view of the present invention;

[0026] Figure 4 It is a schematic diagram of the right structure of the present invention;

[0027] Figure 5 for Figure 3 Partial schematic diagram of the waterproof structure in the middle and front ends;

[0028] Figure 6 for Figure 3 A partial schematic diagram of another example of the middle and front waterproof structure;

[0029] Figure 7 for Figure 4 A partial schematic diagram of the middle push plate;

[0030] Figure 8 for Figure 7 AA section view;

[0031] Fig. 9 for Figure 7 Bottom view of

[0032] Fig.10 for Fig. 9 BB cross-sectional view.

[0033] In the figure: 1. sleeve; 2. spindle; 3. stator and rotor assembly; 4. electric spindle encoder; 5. cooling system; 6. front bearing assembly; 7. rear bearing assembly; 8. front gland; 9. waterproof cover; 10. hexagon socket screw; 11. housing; 12. O-ring; 13. gas sealing annular groove; 14. labyrinth sealing groove; 15. intercepting groove; 16. drainage hole; 17. plug; 18. coolant channel; 19. coolant inlet; 20. high pressure valve Towards the nozzle; 21, waste oil discharge port; 22, lubricating oil inlet; 23, sleeve cooling inlet; 24, sleeve cooling outlet; 25, airtight seal inlet; 26, encoder aviation socket; 27, power aviation socket; 28, push plate; 29, throttle tooth groove; 30, annular groove; 31, water throwing trough; 32, drain outlet; 33, gas channel; 34, groove; 36, process hole; 37, first channel; 38, second channel; 39, third channel. DETAILED DESCRIPTION

[0034] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0035] See also Figure 1-4 A multifunctional telescopic servo waterwheel electric spindle comprises a sleeve 1, a spindle 2, a stator-rotor assembly 3, an electric spindle encoder 4 and a cooling system 5. The front and rear parts of the spindle 2 are respectively provided with a front bearing group 6 and a rear bearing group 7. The front interface of the spindle can be provided with NT, BT, HSK, ER spreading knife structures. The front bearing group 6 and the rear bearing group 7 together with the sleeve 1 and the bearing end covers at both ends of the sleeve 1 form an integral sealed cavity. The stator-rotor assembly 3 is installed between the front bearing group 6 and the rear bearing group 7, and the stator-rotor assembly 3 is connected to the spindle 2 and can drive the spindle. 2 rotates, a front pressure cover 8 is arranged on the front bearing assembly 6, and a waterproof cover 9 is clamped on one side of the front pressure cover 8 through a chuck positioning pin, wherein the waterproof cover 9 is positioned with the outer circle of the front end of the spindle by the inner hole and is fixed to the front end of the spindle by 6 hexagon socket screws, and rotates simultaneously with the spindle, which can effectively block a large amount of water from the axial direction (mainly axial water) and the radial direction, and block a large amount of cutting fluid. Further, the electric spindle encoder 4 is installed on the shaft wall of the electric spindle 2, and the cooling system 5 includes coolant channels 18 evenly arranged on the sleeve 1, and the coolant channels 18 have two ends. The sides are respectively provided with a coolant inlet 19 and a high-pressure universal nozzle 20. When the coolant passes through the 8 cooling channels, it can take away the heat caused by friction, dissipate the heat of the box body, reduce the thermal deformation of the box body, improve the processing accuracy, and ensure the processing stability. The sleeve 1 is provided with a waste oil drain port 21 and a lubricating oil inlet 22, and the waste oil drain port 21 can drain oil from the axial or radial drain port 21 according to the installation direction of the waterwheel electric spindle 2, which is convenient for the use of the electric spindle 2. The bearings of the front bearing group 6 and the rear bearing group 7 are selected as angular contact bearings, which can also be adjusted according to the actual working conditions. Single-row cylindrical roller bearings, double-row cylindrical roller bearings, etc. are selected to improve selectivity. The coolant channel 18 and the coolant inlet 19 of the eight groups of coolant channels 18 can be selected to have 8 coolant inlets, 8 air inlets, or 4 liquids and 4 airs. The cooling method can be adjusted according to needs. The bearing end cover of the sleeve 1 is provided with a sleeve cooling inlet 23, a sleeve cooling outlet 24, an air seal inlet 25, an encoder aviation socket 26 and a power aviation socket 27, and the encoder aviation socket (26) and the power aviation socket (27) are both located behind the push plate (28).

[0036] Please refer to Figure 5In a waterproof structure of the present application, an air-sealed annular groove 13 and a labyrinth sealing groove 14 are provided between the waterproof cover 9 and the front pressure cover 8, an intercepting groove 15 and a drainage hole 16 are provided around the labyrinth sealing groove 14, and a plug 17 is provided between the intercepting groove 15 and the drainage hole 16. If water enters the labyrinth sealing groove 14, it will eventually enter the intercepting groove 15 and flow out from the drainage hole 16. The protruding edge designed on the waterproof cover 9 forms a double labyrinth with the inner and outer sides so that the waterproof cover 9 can block a large amount of cutting fluid. The waterproof cover 9 and the groove of the front pressure cover 8 form a labyrinth waterproof structure, and the gap between the protruding flange of the waterproof cover 9 and the groove of the front pressure cover 8 is 0.05mm. The 0.05mm gap is relatively small, so the probability of water and dust entering is very low, and the waterproof and dustproof effect is better.

[0037] Please refer to Figure 6 In another waterproof structure of the present application, an inclined annular groove 30 is designed at the contact point between the waterproof cover 9 and the bottom of the front pressure cover 8, which plays the role of rotational diversion, and diverts the water to the drainage hole 16 at the front pressure cover 8 for discharge. A water-throwing groove 31 is provided between the waterproof cover 9 and the main shaft, and the water-throwing groove 31 corresponds to the intercepting groove 15 provided on the front pressure cover 8. A plurality of drainage ports 32 are provided below the intercepting groove 15. After the water in the water-throwing groove 31 is thrown to the intercepting groove 15, it is discharged from the drainage port 32 below the intercepting groove 15. When the cutting fluid pressure is large, a small amount of body fluid may be rebounded to the waterproof cover 9 by other objects.

[0038] Preferably, a gas channel 33 is provided on the sleeve 1, and dry compressed air is passed into the gas channel 33. The hollow hexagon socket screw 10 enters the groove 34 at the front pressure cover and forms an annular cavity with the waterproof cover 9. The gas is compressed in the annular cavity to form a high-pressure area. After entering the gap between the front pressure cover 8 and the waterproof cover 9, it flows out to the outside, forming an air curtain seal that blows air from the inside to the outside. An O-ring 12 is sleeved on the gas channel 33. The O-ring 12 is located between the sleeve 1 and the front pressure cover 8 and the push plate 28. The hollow hexagon socket screw 10 enters the gas cavity designed in the front cover, gathers gas, and then enters the designed annular groove 13 with an O-shaped cross-section from the small air hole to form an annular gas sealing ring, which effectively prevents a small amount of dust and liquid that may enter, and it is difficult for liquid to enter the groove 34.

[0039] Preferably, a triangular throttling tooth groove 29 is provided on the upper inner wall of the waterproof cover 9, and the gap between the waterproof cover and the front pressure cover at the throttling tooth groove 29 is about 0.1 mm. The two produce a step-by-step throttling effect through the viscous friction of the medium and the conversion of energy, avoiding the direction of direct high-pressure flushing. The gap between the waterproof cover and the front pressure cover is set on the back of the flushing direction, and only a small amount of rebounded liquid will pass through, which greatly reduces the probability of water ingress.

[0040] See also Figure 7-10A first channel 37, a second channel 38 and a third channel 39 are provided at the bottom of the push plate 28, and a process hole 36 is provided on each side of the push plate. The first channel 37 and the third channel 39 are respectively connected to the cooling inlet 23 and the cooling outlet 24 through the process holes on the side of the push plate, and the second channel 38 is connected to the airtight seal inlet 25, so that the coolant inlet and outlet are connected to the sleeve cooling cycle inlet and outlet. The coolant in the cooling process enters the push plate 28 through the cooling inlet 23, reaches the sealing cavity of the push plate 28 and the sleeve 3 through the first channel 37, and enters the coolant channel 18 connected to the sealing cavity. At this time, the coolant entering the coolant channel 18 evenly arranged on the sleeve 3 returns to the sealing cavity after cooling the sleeve 3, passes through the push plate and reaches the cooling outlet 24, forming a circulating cooling, and the airtight seal gas enters the second channel 38 through the airtight seal inlet 25, reaches the sealing cavity of the push plate 28 and the sleeve 3, and then enters the gas channel 33.

[0041] In summary, the multifunctional telescopic servo waterwheel electric spindle can block a large amount of cutting fluid through the waterproof cover 9 when in use. The waterproof cover 9 and the gland groove form a labyrinth waterproof structure. At the same time, the design of the process hole and the hexagonal conical screw plug allows the gas to enter the airway of the sleeve 1 and transmit the gas forward to the front gland. The hollow hexagonal screw 10 also plays a role in fixing and guiding the gas with the gland. The gas enters the gas cavity designed in the front cover through the hollow hexagonal screw 10 to gather gas, and then enters the designed O-shaped annular groove 13 through the small air hole to form an annular gas sealing ring, which effectively prevents a small amount of powder that may enter. Dust and liquid enter; and by setting 8 ring-spray cooling channels distributed circumferentially around the outer periphery of the box body hole, the coolant can take away the heat caused by friction when passing through the 8 cooling channels, dissipate the heat of the box body, reduce the thermal deformation of the box body, improve the processing accuracy, and ensure the processing stability. During the cutting process, the coolant can flush the tool and the workpiece, so that the dust and oil mist are merged with the coolant and finally discharged with the coolant, achieving the best dust reduction and oil mist removal effect. All radial size gaps of this sealing structure are controlled within 0.1mm, producing a step-by-step throttling effect, and multiple drainage holes in two places to achieve a labyrinth throttling seal + air seal to prevent liquid.

[0042] Those skilled in the art should understand that, in the disclosure of the present invention, the orientation or position relationship indicated by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0043] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0044] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present invention.

Claims

1. A multifunctional telescopic servo waterwheel electric spindle, characterized in that: The invention comprises a sleeve (1), a main shaft (2), a housing (11) and a cooling system (5), wherein a front bearing group (6) and a rear bearing group (7) are respectively installed at the front and rear of the main shaft (2), wherein a front gland (8) is arranged on the front bearing group (6), the sleeve (1) and the front gland (8) located at the front end of the sleeve (1) and a push plate (28) at the rear end together form an integral sealing cavity, and a waterproof cover (9) is clamped on one side of the front gland (8), wherein a protruding edge of the waterproof cover (9) forms a double maze with the inner and outer sides of the front gland (8), and the front gland (8) and the push plate (28) are connected to each other. The sleeve (1) is fixed, the waterproof cover (9) and the groove of the front pressure cover (8) form a labyrinth waterproof structure, an O-ring (12) is provided between the sleeve (1) and the front pressure cover (8) and the push plate (28), an airtight annular groove (13) and a labyrinth sealing groove (14) are provided between the waterproof cover (9) and the front pressure cover (8), a cut-off groove (15) and a drainage hole (16) are provided around the labyrinth sealing groove (14), and a plug (17) is provided between the cut-off groove (15) and the drainage hole (16), the cooling system (5) comprises A coolant channel (18) is provided on the cylinder (1), and a coolant inlet (19) and a high-pressure universal nozzle (20) are respectively provided on both sides of the coolant channel (18). A gas channel (33) is provided on the box body (11). The front gland (8) and the box body (11) are fixed by a hollow hexagon socket screw and a plurality of hexagon socket screws, and the output end of the hollow hexagon socket screw (10) is inserted into the gas channel (33) on the box body (11), and dry compressed gas is introduced into the gas channel (33). The hollow hexagon socket screw (10) enters The groove (34) at the front gland forms an annular cavity with the waterproof cover (9), and the gas is compressed in the annular cavity to form a high-pressure area. The gas enters the gap between the front gland (8) and the waterproof cover (9) and then flows out to the outside, forming an air curtain seal that blows air from the inside to the outside. The hollow hexagon socket screw (10) enters the gas cavity designed in the front gland (8), gathers the gas, and then enters the designed annular groove (13) with an O-shaped cross section from the small air hole to form an annular gas sealing ring. The gap between the protruding flange of the waterproof cover (9) and the groove of the front gland (8) is 0.05 mm.

2. A multifunctional telescopic servo waterwheel electric spindle, characterized in that: The invention comprises a sleeve (1), a main shaft (2), a housing (11) and a cooling system (5), wherein a front bearing group (6) and a rear bearing group (7) are respectively installed at the front and rear of the main shaft (2), wherein a front gland (8) is arranged on the front bearing group (6), the sleeve (1) and the front gland (8) located at the front end of the sleeve (1) and a push plate (28) at the rear end together form an integral sealing cavity, and a waterproof cover (9) is clamped on one side of the front gland (8), and a protruding edge on the waterproof cover (9) forms a sealing cavity with the inner and outer sides of the front gland (8). A double labyrinth, wherein the front gland (8) is fixed to the sleeve (1), the waterproof cover (9) and the groove of the front gland (8) form a labyrinth waterproof structure, an inclined annular groove (30) is designed at the contact point between the waterproof cover (9) and the lower part of the front gland (8), a water-throwing groove (31) is provided between the waterproof cover (9) and the main shaft, and the water-throwing groove (31) corresponds to the intercepting groove (15) on the front gland (8), a plurality of drainage ports (32) are provided below the intercepting groove (15), and the drainage ports (32) are communicated with the drainage holes (16), and the cooling system (5) comprises a coolant channel (18) uniformly arranged on the sleeve (1), a coolant inlet (19) and a high-pressure universal nozzle (20) are respectively arranged on both sides of the coolant channel (18), a gas channel (33) is arranged on the box body (11), the front gland (8) and the box body (11) are fixed by a hollow hexagon socket screw and a plurality of hexagon socket screws, and the output end of the hollow hexagon socket screw (10) is inserted into the gas channel (33) on the box body (11), and the gas channel (33) is passed through Dry compressed gas and the hollow hexagon socket screw (10) enter the groove (34) at the front gland and form an annular cavity with the waterproof cover (9). The gas is compressed in the annular cavity to form a high-pressure area, enters the gap between the front gland (8) and the waterproof cover (9), and then flows out to the outside, forming an air curtain seal that blows air from the inside to the outside. The hollow hexagon socket screw (10) enters the gas cavity designed in the front gland (8), gathers gas, and then enters the designed annular groove (13) with an O-shaped cross section from the small air hole to form an annular gas sealing ring.

3. The multifunctional telescopic servo waterwheel electric spindle according to any one of claims 1 or 2, characterized in that: The sleeve (1) is provided with a waste oil discharge port (21) and a lubricating oil inlet (22), and the waste oil discharge port (21) can discharge oil from an axial or radial discharge port according to the installation direction of the waterwheel electric spindle.

4. The multifunctional telescopic servo waterwheel electric spindle according to any one of claims 1 or 2, characterized in that: A triangular throttling tooth groove (29) is provided above the inner wall of the waterproof cover (9).

5. The multifunctional telescopic servo waterwheel electric spindle according to any one of claims 1 or 2, characterized in that: A stator-rotor assembly (3) is installed between the front bearing assembly (6) and the rear bearing assembly (7), and the stator-rotor assembly (3) is connected to the main shaft (2) and drives the main shaft (2) to rotate.

6. The multifunctional telescopic servo waterwheel electric spindle according to any one of claims 1 or 2, characterized in that: The cooling liquid channels (18) are provided in eight groups.

7. The multifunctional telescopic servo waterwheel electric spindle according to any one of claims 1 or 2, characterized in that: The bearing end cover of the housing (11) is provided with a sleeve cooling inlet (23), a sleeve cooling outlet (24), a gas seal inlet (25), an encoder aviation socket (26) and a power aviation socket (27), and the encoder aviation socket (26) and the power aviation socket (27) are both located behind the push plate (28), and an electric spindle encoder (4) is installed on the shaft wall of the electric spindle (2).

8. The multifunctional telescopic servo waterwheel electric spindle according to any one of claims 1 or 2, characterized in that: The push plate (28) is provided with a first channel (37), a second channel (38) and a third channel (39) at the bottom, and a process hole (36) is provided on each side of the push plate. The first channel (37) and the third channel (39) are respectively connected to the cooling inlet (23) and the cooling outlet (24) through the process holes on the side of the push plate, and the second channel (38) is connected to the airtight seal inlet (25).

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