CN211071844U - High-load high-rigidity quick cooling type electric spindle - Google Patents

Abstract

The utility model discloses a high-load high-rigidity quick cooling type motorized spindle, which comprises a steel cylinder, front bearing seat and rear bearing seat, be equipped with the fore bearing in the front bearing seat, be equipped with the rear bearing room in the rear bearing seat, be equipped with the rear bearing in the rear bearing room, be equipped with the water-cooling endotheca in the steel cylinder, be equipped with stator module in the water-cooling endotheca, wear to be equipped with the rotor in the stator module, the rear end of rear bearing seat is fixed with the back of the body lid, the rear end of back of the body lid is fixed with coolant liquid injection joint and coolant liquid discharge joint, fore bearing cooling water course has been seted up to the lateral wall of front bearing seat, fore bearing cooling water course encircles in the front bearing seat, the outside cover of front bearing seat is equipped with the water-cooling. The utility model discloses cooling circuit is reasonable, can preferentially cool off the front bearing part fast to the cooling effect is better.

Description

High-load high-rigidity quick cooling type electric spindle

Technical Field

The utility model relates to an electricity main shaft especially relates to a high rigidity quick cooling formula electricity main shaft of high load.

Background

The electric spindle is an important driving device applied to machine tool equipment and used for carrying out precision machining. In the existing electric spindle, because a large amount of heat is generated in the working process, a cooling mechanism must be designed for the electric spindle, and the existing cooling mechanism of the electric spindle generally cools a front bearing part and a stator part separately, so that the cooling channel of the electric spindle is complex, the number of cooling loops is large, and the production, the manufacturing and the maintenance of the spindle are not facilitated. In addition, because the heat generation of the front end of the main shaft is large during the working process, the cooling capacity of the front end part of the main shaft is insufficient due to the conventional cooling mode, and the machining requirements of large load and high rigidity cannot be met.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in, to prior art's not enough, it is reasonable to provide a cooling circuit, can preferentially cool off fast to the front bearing part to the high rigidity quick cooling formula electricity main shaft of high load that the cooling effect is better.

In order to solve the technical problem, the utility model adopts the following technical scheme.

A high-load high-rigidity quick cooling type electric spindle comprises a steel cylinder, wherein a front bearing seat and a rear bearing seat are respectively arranged at the front end and the rear end of the steel cylinder, a front bearing is arranged in the front bearing seat, a rear bearing chamber is arranged in the rear bearing seat, a rear bearing is arranged in the rear bearing chamber, a water-cooling inner sleeve is arranged in the steel cylinder, a stator assembly is arranged in the water-cooling inner sleeve, a rotor is arranged in the stator assembly in a penetrating manner and is rotatably connected with the rotor, the front end and the rear end of the rotor respectively penetrate through the front bearing and the rear bearing, a back cover is fixed at the rear end of the rear bearing seat, a cooling liquid injection joint and a cooling liquid discharge joint are fixed at the rear end of the back cover, sequentially communicated cooling liquid injection channels are formed in the back cover, the rear bearing seat, the steel cylinder and the front bearing seat, a front bearing cooling water channel is formed in the outer side, the outside cover of front axle bearing is equipped with the water-cooling overcoat, the water-cooling overcoat cover in front bearing cooling water course, the coolant liquid injection joint the coolant liquid injection passageway with the entry in front bearing cooling water course communicates in proper order, stator cooling water course has been seted up to the lateral wall of water-cooling endotheca, rear bearing cooling water course has been seted up to the lateral wall of rear bearing room, the rear axle bearing cover in rear bearing cooling water course, the export in front bearing cooling water course stator cooling water course rear bearing cooling water course with the coolant liquid discharge joint communicates in proper order, the coolant liquid that coolant liquid injection joint was poured into is in proper order right the front axle bearing stator module with the rear bearing cools off the back, via the coolant liquid discharge joint discharges.

Preferably, at least two water-proof rings are formed in the front bearing cooling water channel, the outer ring surface of each water-proof ring abuts against the inner wall of the water-cooling jacket, first openings are formed in the water-proof rings, and the first openings of two adjacent water-proof rings are symmetrically arranged on two sides of the front bearing seat.

Preferably, a plurality of annular flanges are arranged between two adjacent water-proof rings, second openings are respectively formed in two sides of each annular flange, and a gap is formed between the outer annular surface of each annular flange and the inner wall of the water-cooling jacket.

Preferably, the front end of the front bearing seat is provided with an illegal flange end, the rear end of the front bearing seat is provided with a flange end, the inlet of the front bearing cooling water channel is close to the illegal flange end of the front bearing seat, and the outlet of the front bearing cooling water channel is close to the flange end of the front bearing seat.

Preferably, a movable gap is arranged between the rear bearing chamber and the rear bearing seat, two sealing rings are sleeved on the outer side of the rear bearing chamber and are respectively arranged on the front side and the rear side of the rear bearing cooling water channel, and the sealing rings are clamped between the rear bearing chamber and the rear bearing seat.

Preferably, a plurality of oil gas injection joints and an oil gas discharge joint are fixed on the back cover, a plurality of oil gas injection channels which are sequentially communicated are formed in the rear bearing seat, the steel cylinder and the front bearing seat, a plurality of front bearings are arranged in the rear bearing seat, first through holes are formed in outer rings of the front bearings, input ends of the plurality of oil gas injection channels are respectively communicated with the plurality of oil gas injection joints, output ends of the plurality of oil gas injection channels are respectively communicated with the first through holes of the front bearings, an inner spacer ring and an outer spacer ring are arranged between two adjacent front bearings, the inner spacer ring is clamped between the inner rings of the two front bearings, the outer spacer ring is clamped between the outer rings of the two front bearings, a discharge gap is formed between the inner spacer ring and the outer spacer ring, a second through hole is formed in the front bearing seat, the steel cylinder and the rear bearing seat, the oil gas channels which are sequentially communicated are formed in the front bearing seat, the, the second through holes of the outer spacer rings are communicated with the input end of the oil-gas discharge channel, and the output end of the oil-gas discharge channel is communicated with the oil-gas discharge joint.

Preferably, a bearing pressing plate is fixed to the front end of the front bearing seat and abuts against the outer ring of the front bearing, an oil gas collecting tank is arranged on the rear side of the bearing pressing plate and faces towards the space between the inner ring and the outer ring of the front bearing, a plurality of oil gas guide grooves are formed in the rear end face of the bearing pressing plate and communicated between the oil gas collecting tank and the oil gas discharge channel.

Preferably, an outer flange is formed on the outer ring surface of the inner spacer ring, a rear inclined surface is formed at the rear end of the outer flange, an annular rear oil groove is formed in the rear end surface of the outer spacer ring, the annular rear oil groove faces the outer flange, and the annular rear oil groove is communicated with the second through hole.

Preferably, a pull rod penetrates through the rotor, the front end of the pull rod is connected with a cutter handle assembly, and the rear end of the pull rod is located in the back cover.

Preferably, the rear end of back of the body lid is fixed with the cylinder cover, be equipped with hydro-cylinder and the two sliding connection in the cylinder cover, the rear end of hydro-cylinder is fixed with the cylinder cap, be equipped with the piston in the hydro-cylinder, the center department of piston is equipped with hollow piston rod, the front end of piston rod passes the hydro-cylinder and extend to in the back of the body lid, the rear end of piston rod passes the cylinder cap, the rear end of pull rod passes the piston rod, be fixed with first oil pressure joint and second oil pressure joint on the back of the body lid, annular hydraulic oil groove has been seted up to the lateral wall of hydro-cylinder, the cylinder cover in hydraulic oil groove, first hydraulic oil passageway and second hydraulic oil passageway have been seted up in the hydro-cylinder, first oil pressure joint, hydraulic oil groove, first hydraulic oil passageway and the rear side cavity of piston communicates in proper order, second oil pressure joint, The second hydraulic oil channel is communicated with the front side cavity of the piston in sequence, and the piston is driven to move back and forth by loading hydraulic oil to the first oil pressure joint or the second oil pressure joint.

In the high-load high-rigidity quick cooling type electric main shaft disclosed by the utility model, the outer side wall of the front bearing seat is provided with a front bearing cooling water channel, the cooling liquid injected by the cooling liquid injection joint is transmitted to the front bearing cooling water channel through the cooling liquid injection channel, thereby preferentially cooling the front bearing block and the front bearing therein, so that the front bearing portion is maintained in a cooled state, thereby meeting the processing requirements of large load and high rigidity, and simultaneously, the utility model cools the front bearing, the stator component and the rear bearing by the cooling liquid injected by the cooling liquid injection joint in turn, the cooling device adopts a mode of firstly cooling the part with high heat productivity and then cooling the part with low heat productivity, the cooling loop is more reasonable in arrangement, and the cooling requirement of the main shaft is better met, so that the cooling device is suitable for popularization and application in the field.

Drawings

Fig. 1 is a partial sectional view of an electric spindle according to the present invention;

fig. 2 is a partial sectional view of the electric spindle of the present invention;

fig. 3 is a partial sectional view of the motorized spindle of the present invention;

FIG. 4 is a perspective view of the front bearing block;

FIG. 5 is a cross-sectional view of the front bearing block;

fig. 6 is a partial sectional view of the electric spindle of the present invention;

fig. 7 is a partial sectional view of the motorized spindle of the present invention;

fig. 8 is a partial sectional view six of the motorized spindle of the present invention;

FIG. 9 is an enlarged view of portion A of FIG. 6;

FIG. 10 is a block diagram of an outer spacer ring;

FIG. 11 is a block diagram of an inner spacer ring;

FIG. 12 is a structural view of a bearing retainer plate;

FIG. 13 is a cross-sectional view of the bearing press plate;

FIG. 14 is a first cross-sectional view of a portion of the front bearing block;

FIG. 15 is a second cross-sectional view of the front bearing block portion;

FIG. 16 is a structural view of the annular nozzle plate;

FIG. 17 is a cross-sectional view of a cylinder portion;

fig. 18 is an internal structural view of the rotor.

Detailed Description

The present invention will be described in more detail with reference to the accompanying drawings and examples.

The utility model discloses a high-load high-rigidity quick cooling type electric spindle, which is shown by combining figures 1 to 18 and comprises a steel cylinder 1, wherein a front bearing seat 2 and a rear bearing seat 3 are respectively arranged at the front end and the rear end of the steel cylinder 1, a front bearing 20 is arranged in the front bearing seat 2, a rear bearing chamber 30 is arranged in the rear bearing seat 3, a rear bearing 31 is arranged in the rear bearing chamber 30, a water-cooling inner sleeve 10 is arranged in the steel cylinder 1, a stator assembly 11 is arranged in the water-cooling inner sleeve 10, a rotor 4 is arranged in the stator assembly 11 in a penetrating way and is rotationally connected with the stator assembly and the rotor 4, the front bearing 20 and the rear bearing 31 are respectively penetrated by the front end and the rear end of the rotor 4, a back cover 5 is fixed at the rear end of the rear bearing seat 3, a cooling liquid injection joint 50 and a cooling liquid discharge joint 51 are fixed at the rear end of the back cover 5, the rear bearing seat 3, the steel cylinder 1 and the, front bearing cooling water course 21 has been seted up to the lateral wall of front bearing frame 2, front bearing cooling water course 21 surround in front bearing frame 2, the outside cover of front bearing frame 2 is equipped with water-cooling overcoat 22, water-cooling overcoat 22 cover in front bearing cooling water course 21, coolant liquid injection joint 50 coolant liquid injection passageway 12 with the entry of front bearing cooling water course 21 communicates in proper order, stator cooling water course 13 has been seted up to the lateral wall of water-cooling endotheca 10, rear bearing cooling water course 32 has been seted up to the lateral wall of rear bearing room 30, rear bearing frame 3 rear bearing cooling water course 32 covers, the export of front bearing cooling water course 21 stator cooling water course 13 rear bearing cooling water course 32 with coolant liquid discharge joint 51 communicates in proper order, the coolant liquid that coolant liquid injection joint 50 was injected is right in proper order front bearing 20, front bearing, After cooling the stator assembly 11 and the rear bearing 31, the coolant is discharged through the coolant discharge joint 51.

In the electric spindle, a front bearing cooling water channel 21 is arranged on the outer side wall of the front bearing seat 2, the coolant injected by the coolant injection joint 50 is transferred to the front bearing cooling water passage 21 through the coolant injection passage 12, so that the front bearing block 2, and the front bearing 20 therein, is preferentially cooled, so that the front bearing portion is maintained in a cooled state, thereby meeting the processing requirements of large load and high rigidity, and simultaneously, the cooling liquid injected by the cooling liquid injection joint 50 of the utility model cools the front bearing 20, the stator assembly 11 and the rear bearing 31 in turn, the cooling device adopts a mode of firstly cooling the part with high heat productivity and then cooling the part with low heat productivity, the cooling loop is more reasonable in arrangement, and the cooling requirement of the main shaft is better met, so that the cooling device is suitable for popularization and application in the field.

As a preferable structure, at least two water-proof rings 23 are formed in the front bearing cooling water channel 21, an outer annular surface of each water-proof ring 23 abuts against an inner wall of the water-cooling jacket 22, first openings are formed in the water-proof rings 23, and the first openings of two adjacent water-proof rings 23 are symmetrically arranged on two sides of the front bearing block 2. Under the action of the water-proof ring 23, the extension length of the front bearing cooling water channel 21 is prolonged.

In order to further improve the heat exchange capacity, in this embodiment, a plurality of annular flanges 24 are disposed between two adjacent water-proof rings 23, second openings are respectively disposed on two sides of the annular flanges 24, and a gap is disposed between an outer circumferential surface of the annular flange 24 and an inner wall of the water-cooling jacket 22. The plurality of annular flanges 24 contribute to increase the contact area of the coolant with the front bearing housing 2, so that the heat exchange capacity is further improved.

In this embodiment, it is preferable to inject the cooling liquid from the front end, please refer to fig. 4 and 5, specifically, an illegal flange end is formed at the front end of the front bearing seat 2, a flange end is formed at the rear end of the front bearing seat 2, an inlet of the front bearing cooling water channel 21 is close to the illegal flange end of the front bearing seat 2, and an outlet of the front bearing cooling water channel 21 is close to the flange end of the front bearing seat 2. The structure is beneficial to enabling the temperature of each bearing to be in a consistent state after the whole bearing group operates.

As a preferable mode, a movable gap is provided between the rear bearing chamber 30 and the rear bearing seat 3, two sealing rings are sleeved on the outer side of the rear bearing chamber 30, the two sealing rings are respectively arranged on the front side and the rear side of the rear bearing cooling water channel 32, and the sealing rings are clamped between the rear bearing chamber 30 and the rear bearing seat 3. The structure enables the rear bearing chamber 30 and the rear bearing seat 3 to be in a floating relation, and after the cooling liquid is fully distributed around the rear bearing chamber 30, the rear bearing chamber 30 and the rear bearing 31 can be automatically aligned and kept at the position coaxial with the rotor 4.

The oil-gas lubrication mode is preferably adopted in the front bearing part of the utility model, specifically speaking, a plurality of oil-gas injection joints and an oil-gas discharge joint are fixed on the back cover 5, a plurality of oil-gas injection channels 15 which are communicated in sequence are arranged in the rear bearing seat 3, a plurality of front bearings 20 are arranged in the rear bearing seat 3, a first through hole 200 is arranged on the outer ring of each front bearing 20, the input ends of the plurality of oil-gas injection channels 15 are respectively communicated with the plurality of oil-gas injection joints, the output ends of the plurality of oil-gas injection channels 15 are respectively communicated with the first through hole 200 of each front bearing 20, an inner spacer ring 25 and an outer spacer ring 26 are arranged between two adjacent front bearings 20, the inner spacer ring 25 is clamped between the inner rings of the two front bearings 20, the outer spacer ring 26 is clamped between the outer rings of the two front bearings 20, and a gap is arranged between the inner spacer ring 25 and the outer spacer ring 26, the outer spacer ring 26 is provided with a second through hole 260, the front bearing seat 2, the steel cylinder 1 and the rear bearing seat 3 are internally provided with an oil-gas discharge passage 16 which is communicated in sequence, the second through holes 260 of the outer spacer rings 26 are communicated with the input end of the oil-gas discharge passage 16, and the output end of the oil-gas discharge passage 16 is communicated with the oil-gas discharge joint. The oil-gas lubrication mode can enable the outer circular surface of the front bearing and the inner hole of the front bearing seat to form an oil film, and the oil-gas lubrication effect is achieved.

As a preferable structure, a bearing pressing plate 201 is fixed at the front end of the front bearing seat 2, the bearing pressing plate 201 abuts against the outer ring of the front bearing 20, an oil-gas collecting groove 202 is formed in the rear side of the bearing pressing plate 201, the oil-gas collecting groove 202 faces between the inner ring and the outer ring of the front bearing 20, a plurality of oil-gas guide grooves 203 are formed in the rear end face of the bearing pressing plate 201, and the oil-gas guide grooves 203 are communicated between the oil-gas collecting groove 202 and the oil-gas discharge passage 16. The oil and gas collection groove 202 collects oil and gas at the front end of the front bearing 20 and discharges the oil and gas into the oil and gas discharge passage 16.

In order to guide oil and gas, in this embodiment, an outer flange 250 is formed on an outer annular surface of the inner spacer ring 25, a rear inclined surface 251 is formed at a rear end of the outer flange 250, an annular rear oil groove 261 is formed on a rear end surface of the outer spacer ring 26, the annular rear oil groove 261 faces the outer flange 250, and the annular rear oil groove 261 is communicated with the second through hole 260.

Regarding the structure inside the rotor 4, in this embodiment, a pull rod 7 is inserted into the rotor 4, a tool holder assembly 8 is connected to the front end of the pull rod 7, and the rear end of the pull rod 7 is located inside the back cover 5.

The action of loosening and clamping the cutter of the embodiment preferably adopts a static pressure driving mode, specifically, an oil cylinder sleeve 60 is fixed at the rear end of the back cover 5, an oil cylinder 61 and an oil cylinder cover 62 are arranged in the oil cylinder sleeve 60 and are in sliding connection with each other, an oil cylinder cover 62 is fixed at the rear end of the oil cylinder 61, a piston 63 is arranged in the oil cylinder 61, a hollow piston rod 64 is arranged at the center of the piston 63, the front end of the piston rod 64 penetrates through the oil cylinder 61 and extends into the back cover 5, the rear end of the piston rod 64 penetrates through the oil cylinder cover 62, the rear end of the pull rod 7 penetrates through the piston rod 64, a first oil pressure joint 66 and a second oil pressure joint 67 are fixed on the back cover 5, an annular hydraulic oil groove 68 is formed in the outer side wall of the oil cylinder 61, the oil cylinder sleeve 60 covers the hydraulic oil groove 68, a first hydraulic oil passage 610 and a second hydraulic oil passage, the first oil pressure joint 66, the hydraulic oil tank 68, the first hydraulic oil channel 610 and the rear cavity of the piston 63 are sequentially communicated, the second oil pressure joint 67, the second hydraulic oil channel 611 and the front cavity of the piston 63 are sequentially communicated, and the piston 63 is driven to move back and forth by loading hydraulic oil to the first oil pressure joint 66 or the second oil pressure joint 67.

As a preferred structure, the outer diameter of the water-cooling outer sleeve 22 gradually increases from front to back, so that the water-cooling outer sleeve 22 is tapered. The conical design can ensure that the front end of the main shaft can extend into a narrower space, thereby avoiding the occurrence of shaking and fracture caused by overlong knife handle and cutter.

In this embodiment, it is preferable that the front end of the spindle relates to an air seal structure, specifically, a dust ring 210 is fixed at the front end of the bearing pressure plate 201, a ring spray plate 211 is fixed at the front end of the dust ring 210, a dust cover 212 is sleeved on the rotor 4, the bearing pressure plate 201, the dust ring 210 and the ring spray plate 211 are all surrounded by the dust cover 212, gaps are provided between the dust cover 212 and the bearing pressure plate 201, between the dust ring 210 and the ring spray plate 211, a waterproof cover 214 is sleeved on the rotor 4, the waterproof cover 214 is located at the inner side of the ring spray plate 211, a gap is provided between the waterproof cover and the ring spray plate 211, an air seal joint is provided on the back cover 5, sequentially communicated air seal channels are provided in the back cover 5, the back bearing seat 3, the steel cylinder 1, the front bearing seat 2, the bearing pressure plate 201 and the dust ring 210, a plurality of air seal guide grooves 213 are provided on the back end face of the, the air seal guide groove 213 is communicated between the air seal channel and the gap on the inner side of the annular spraying plate 211.

In order to ensure the air sealing effect and prevent dust, water and the like from entering the gap, the present embodiment preferably designs an air bag structure for temporarily storing the air flow, specifically, a first annular air bag 215 is formed between the dust cover 212 and the annular spraying plate 211, and a second annular air bag 216 is formed between the waterproof cover 214 and the annular spraying plate 211.

In order to detect the thermal deformation degree of the rotor 4 during operation, in this embodiment, a displacement sensor 217 is fixed to a front end surface of the dust-proof ring 210, and a sensing end of the displacement sensor 217 faces the dust-proof cover 212.

In this embodiment, a central air blowing structure is preferably adopted, specifically, a central air duct 70 is arranged at the center of the pull rod 7, the rear end of the central air duct 70 is communicated with a rotary joint 9, a plurality of L-shaped air ducts 40 are formed in the rotor 4, the front end opening of the L-shaped air duct 40 faces the tool holder assembly 8, the front end of the pull rod 7 is connected with a hollow front connecting rod 71, a plurality of side holes 710 are formed in the side wall of the front connecting rod 71, the side holes 710 are communicated with the central air duct 70, the rear end opening of the L-shaped air duct 40 faces the front connecting rod 71, and when the pull rod 7 is pushed forward, the rear end opening of the L-shaped air duct 40 is communicated with the side holes 710.

The above is only the embodiment of the present invention, and is not intended to limit the present invention, and all modifications, equivalent replacements or improvements made within the technical scope of the present invention should be included within the protection scope of the present invention.

Claims (10)

1. A high-load high-rigidity quick cooling type electric spindle is characterized by comprising a steel cylinder, wherein a front bearing seat and a rear bearing seat are respectively arranged at the front end and the rear end of the steel cylinder, a front bearing is arranged in the front bearing seat, a rear bearing chamber is arranged in the rear bearing seat, a rear bearing is arranged in the rear bearing chamber, a water-cooling inner sleeve is arranged in the steel cylinder, a stator assembly is arranged in the water-cooling inner sleeve, a rotor is arranged in the stator assembly in a penetrating mode and is connected with the stator assembly in a rotating mode, the front end and the rear end of the rotor respectively penetrate through the front bearing and the rear bearing, a back cover is fixed at the rear end of the rear bearing seat, a cooling liquid injection joint and a cooling liquid discharge joint are fixed at the rear end of the back cover, sequentially communicated cooling liquid injection channels are formed in the back cover, the rear bearing seat, the steel cylinder and the front, the front bearing cooling water course encircle in the front bearing seat, the outside cover of front bearing seat is equipped with the water-cooling overcoat, the water-cooling overcoat cover in front bearing cooling water course, the coolant liquid injection joint the coolant liquid injection passageway with the entry in front bearing cooling water course communicates in proper order, stator cooling water course has been seted up to the lateral wall of water-cooling endotheca, rear bearing cooling water course has been seted up to the lateral wall of rear bearing room, the rear bearing cover in rear bearing cooling water course, the export of front bearing cooling water course the stator cooling water course rear bearing cooling water course with the coolant liquid discharge joint communicates in proper order, the coolant liquid that the coolant liquid injection joint was injected is right in proper order the front bearing stator module with the rear bearing cools off the back, via the coolant liquid discharge joint discharges.

2. The high-load high-rigidity rapid cooling type motorized spindle according to claim 1, wherein at least two water-isolating rings are formed in the front bearing cooling water channel, outer ring surfaces of the water-isolating rings abut against an inner wall of the water-cooling jacket, first openings are formed in the water-isolating rings, and the first openings of two adjacent water-isolating rings are symmetrically arranged on two sides of the front bearing seat.

3. The high-load high-rigidity rapid cooling type electric spindle according to claim 2, wherein a plurality of annular flanges are provided between two adjacent water-proof rings, second openings are provided on both sides of each annular flange, and a gap is provided between an outer circumferential surface of each annular flange and an inner wall of the water-cooling jacket.

4. A high-load high-rigidity rapid-cooling electric spindle according to claim 1, wherein the front end of the front bearing block is formed with a non-flange end, the rear end of the front bearing block is formed with a flange end, the inlet of the front bearing cooling water passage is close to the non-flange end of the front bearing block, and the outlet of the front bearing cooling water passage is close to the flange end of the front bearing block.

5. The high-load high-rigidity rapid cooling electric spindle according to claim 1, wherein a clearance is provided between the rear bearing chamber and the rear bearing seat, two sealing rings are sleeved outside the rear bearing chamber, the two sealing rings are respectively provided on the front side and the rear side of the rear bearing cooling water channel, and the sealing rings are clamped between the rear bearing chamber and the rear bearing seat.

6. The high-load high-rigidity quick-cooling electric spindle of claim 1, wherein a plurality of oil-gas injection joints and an oil-gas discharge joint are fixed on the back cover, a plurality of oil-gas injection passages sequentially communicated with each other are formed in the rear bearing seat, the steel cylinder and the front bearing seat, a plurality of front bearings are arranged in the rear bearing seat, first through holes are formed in outer rings of the front bearings, input ends of the plurality of oil-gas injection passages are respectively communicated with the plurality of oil-gas injection joints, output ends of the plurality of oil-gas injection passages are respectively communicated with the first through holes of the front bearings, an inner spacer ring and an outer spacer ring are arranged between two adjacent front bearings, the inner spacer ring is clamped between the inner rings of the two front bearings, the outer spacer ring is clamped between the outer rings of the two front bearings, gaps are formed between the inner spacer ring and the outer spacer ring, and second through holes are formed in the outer spacer ring, the front bearing seat, the steel cylinder and the rear bearing seat are internally provided with oil-gas discharge channels which are communicated in sequence, the second through holes of the outer spacer rings are communicated with the input end of the oil-gas discharge channel, and the output end of the oil-gas discharge channel is communicated with the oil-gas discharge joint.

7. The high-load high-rigidity quick-cooling electric spindle according to claim 6, wherein a bearing pressing plate is fixed to a front end of the front bearing seat, the bearing pressing plate abuts against an outer ring of the front bearing, an oil-gas collecting groove is formed in a rear side of the bearing pressing plate, the oil-gas collecting groove faces between the inner ring and the outer ring of the front bearing, a plurality of oil-gas guide grooves are formed in a rear end face of the bearing pressing plate, and the oil-gas guide grooves are communicated between the oil-gas collecting groove and the oil-gas discharge passage.

8. The high-load high-rigidity rapid cooling electric spindle according to claim 6, wherein an outer flange is formed on an outer annular surface of the inner spacer ring, a rear inclined surface is formed on a rear end of the outer flange, an annular rear oil groove is formed on a rear end surface of the outer spacer ring, the annular rear oil groove faces the outer flange, and the annular rear oil groove is communicated with the second through hole.

9. The high-load high-rigidity rapid cooling type electric spindle according to claim 1, wherein a pull rod penetrates through the rotor, a tool shank assembly is connected to the front end of the pull rod, and the rear end of the pull rod is located in the back cover.

10. The high-load high-rigidity rapid cooling type motorized spindle of claim 9, wherein an oil cylinder sleeve is fixed at the rear end of the back cover, an oil cylinder and an oil cylinder cover are arranged in the oil cylinder sleeve and are in sliding connection with each other, an oil cylinder cover is fixed at the rear end of the oil cylinder, a piston is arranged in the oil cylinder, a hollow piston rod is arranged at the center of the piston, the front end of the piston rod penetrates through the oil cylinder and extends into the back cover, the rear end of the piston rod penetrates through the oil cylinder cover, the rear end of the pull rod penetrates through the piston rod, a first oil pressure joint and a second oil pressure joint are fixed on the back cover, an annular hydraulic oil groove is formed in the outer side wall of the oil cylinder, the oil cylinder sleeve covers the hydraulic oil groove, a first hydraulic oil passage and a second hydraulic oil passage are formed in the oil cylinder, the first oil pressure joint, the hydraulic oil groove, the first hydraulic oil passage and the rear cavity of the piston are sequentially communicated, the second oil pressure joint, the second hydraulic oil channel and the front cavity of the piston are sequentially communicated, and the piston is driven to move back and forth by loading hydraulic oil to the first oil pressure joint or the second oil pressure joint.

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