CN214290854U

CN214290854U - Turning liquid static pressure electric spindle

Info

Publication number: CN214290854U
Application number: CN202022984565.1U
Authority: CN
Inventors: 郑良钢; 陈铮; 刘怀丽
Original assignee: Jiangsu Lingchen Precision Machinery Co Ltd
Current assignee: Jiangsu Lingchen Precision Machinery Co Ltd
Priority date: 2020-12-11
Filing date: 2020-12-11
Publication date: 2021-09-28
Anticipated expiration: 2030-12-11

Abstract

The utility model discloses a turning hydrostatic pressure motorized spindle, which comprises a spindle box, a spindle core, an oil supply system, a motor device and at least one bearing; the bearing is connected in the main shaft box, the front end part of the shaft core is rotatably connected in the bearing, and an oil cavity is arranged between the outer peripheral part of the shaft core and the bearing; the oil supply system is communicated with the oil cavity and is suitable for injecting oil with certain pressure into the oil cavity so as to enable the shaft core to float in the bearing; the motor device is connected with the rear end part of the shaft core and is suitable for acting after oil is injected into the oil cavity so as to drive the shaft core to rotate in the bearing. The utility model discloses can reduce the degree of difficulty of dismouting, save the time of dismouting, can reduce time cost and cost of labor.

Description

Turning liquid static pressure electric spindle

Technical Field

The utility model relates to a turning hydrostatic pressure electricity main shaft.

Background

At present, an electric spindle is a new technology for integrating a machine tool spindle and a motor into a whole, the motor is usually arranged between two bearings in the existing electric spindle, the structure of the electric spindle is complicated due to the arrangement mode, when the motor needs to be maintained due to faults, the whole electric spindle needs to be disassembled, the difficulty of disassembly and assembly maintenance is increased, the disassembly and assembly time is wasted, and the time cost and the labor cost are increased.

Disclosure of Invention

The utility model aims to solve the technical problem that overcome prior art's defect, provide a turning hydrostatic pressure electricity main shaft, it can reduce the degree of difficulty of dismouting, saves the time of dismouting, can reduce time cost and cost of labor.

In order to solve the technical problem, the technical scheme of the utility model is that: a hydrostatic turning spindle comprising:

a main spindle box;

at least one bearing connected in the headstock;

the front end part of the shaft core is rotatably connected in the bearing, and an oil cavity is arranged between the outer peripheral part of the shaft core and the bearing;

the oil supply system is communicated with the oil cavity and is suitable for injecting oil with certain pressure into the oil cavity so as to enable the shaft core to float in the bearing;

and the motor device is connected with the rear end part of the shaft core and is suitable for acting after oil is injected into the oil cavity so as to drive the shaft core to rotate in the bearing.

Further, there is provided a concrete structure of the oil supply system, the oil supply system including:

the oil supply pipeline is arranged in the main shaft box;

the oil inlet pipeline corresponds to the bearing and is arranged in the corresponding bearing, one end of the oil inlet pipeline is communicated with the oil supply pipeline, and the other end of the oil inlet pipeline is communicated with the corresponding oil cavity;

and the oil pump is suitable for pumping oil into the oil supply pipeline and then into the oil cavity.

Further, in order to recycle the oil, a recovery cavity for recovering the oil leaked from the oil cavity is arranged in the main shaft box;

an oil inlet of the oil pump is connected with the recovery cavity;

and an oil outlet of the oil pump is connected with the oil supply pipeline.

And further in order to detect the oil pressure in the oil cavity, a pressure detection hole which is communicated with the oil cavity and is suitable for installing a pressure gauge is arranged in the bearing.

Further, there is provided a concrete structure of the motor device, wherein the motor device is provided with two bearings, one of which is a front bearing mounted on a front end portion of the spindle box, and the other of which is a rear bearing mounted on a rear end portion of the spindle box;

the motor device comprises a jacket, a stator and a rotor; wherein,

the outer sleeve is connected to the rear bearing and sleeved outside the rear end part of the shaft core;

the stator is arranged between the outer sleeve and the shaft core and connected to the outer sleeve;

the rotor is installed between the stator and the shaft core and connected to a rear end portion of the shaft core.

Further, in order to improve the cooling effect, a spiral cooling groove is provided between the outer peripheral portion of the stator and the outer sleeve;

the jacket is provided with a cooling inlet communicated with one end part of the spiral cooling groove and a cooling outlet communicated with the other end part of the spiral cooling groove.

Further, in order to read the rotating speed of the shaft core, a magnetic grid drum is directly or indirectly connected to the shaft core;

and a reading head which is suitable for being matched with the magnetic grid drum to read the rotating speed of the shaft core is directly or indirectly connected to the stator.

Furthermore, a rear end cover is connected to the outer sleeve, an installation cavity is formed in the rear end cover, and the magnetic grid drum and the reading head are both located in the installation cavity;

and/or the shaft core is connected with a dynamic balance ring which is suitable for adjusting the balance grade of the shaft core during rotation.

In order to further improve the sealing performance, the rear end cover is provided with a shaft hole matched with the shaft core, and a rear sealing gap is formed between the shaft hole and the shaft core in a matched manner;

a front sealing gap is formed between the front bearing and the shaft core in a matching manner;

the rear end cover is also provided with an air inlet hole communicated with the rear sealing gap, the air inlet hole is also communicated with the front sealing gap through a gas pipeline, and the air inlet hole is suitable for being connected with gas to form gas seal in the front sealing gap and the rear sealing gap;

and a sealing ring is also arranged in the rear sealing gap.

Further to define the axial position of the spindle, the front bearing includes a front axial portion fittingly connected in the main spindle housing and a front radial portion connected to a front end portion of the front axial portion and extending outward;

the rear bearing comprises a rear axial part which is connected in the main shaft box in a matching way and a rear radial part which is connected to the rear end part of the rear axial part and extends outwards;

the shaft core is provided with a boss part positioned between the front axial part and the rear axial part, and the boss part is used for being matched with the front axial part and the rear axial part to limit the axial position of the shaft core;

an adjusting pad suitable for adjusting the distance between the front bearing and the rear bearing in the axial direction of the shaft core is mounted between the spindle box and the front radial portion and/or between the spindle box and the rear radial portion.

After the technical scheme is adopted, the oil supply system injects oil with certain pressure into the oil cavity, and when the pressure of a resultant formed by the pressure of the oil in the oil cavity is balanced with the load on the shaft core, the shaft core floats in the bearing along the radial direction of the shaft core; the motor device then drives the shaft core to rotate in the bearing. The motor device is connected with the rear end of the shaft core, the bearing is connected with the front end of the shaft core, when the motor device is needed to be maintained due to faults, only the motor device needs to be directly disassembled, the bearing does not need to be disassembled, the difficulty of disassembling and assembling maintenance is reduced, the disassembling and assembling time is saved, the time cost is saved, and the labor cost is also saved.

Drawings

Fig. 1 is a first schematic structural view of a turning liquid static pressure spindle of the present invention;

fig. 2 is a schematic structural view of a turning hydrostatic pressure motorized spindle of the present invention;

fig. 3 is a schematic structural diagram of the bearing of the present invention;

fig. 4 is a schematic structural diagram of the rear end cap of the present invention.

Detailed Description

In order that the present invention may be more readily and clearly understood, the following detailed description of the present invention is provided in connection with the accompanying drawings.

As shown in fig. 1 and 2, a hydrostatic spindle for turning comprises:

a main spindle box 1;

at least one bearing 2, wherein the bearing 2 is connected in the main spindle box 1;

a shaft core 3, the front end of the shaft core 3 is rotatably connected in the bearing 2, and an oil chamber 4 is arranged between the outer periphery of the shaft core 3 and the bearing 2;

an oil supply system communicating with the oil chamber 4 and adapted to inject oil of a certain pressure into the oil chamber 4 to float the shaft core 3 in the bearing 2; specifically, when the resultant hydraulic pressure formed by the pressure of the oil in the oil chamber 4 is balanced with the load on the shaft core 3, the shaft core 3 floats in the bearing 2 in the radial direction thereof;

a motor device 100, wherein the motor device 100 is connected with the rear end part of the shaft core 3 and is suitable for acting after oil is injected into the oil chamber 4 so as to drive the shaft core 3 to rotate in the bearing 2; specifically, motor device 100 with the back end connection of axle core 3, bearing 2 with the preceding end connection of axle core 3 works as when motor device 100 trouble needs the maintenance, only need directly disassemble motor device 100 can, and need not dismantle bearing 2 has reduced the degree of difficulty of dismouting maintenance, has saved dismouting time, has practiced thrift the time cost, has still saved the cost of labor. More specifically, when the oil supply system is not in operation, there is no oil in the oil chamber 4, and the motor device 100 is not allowed to start.

As shown in fig. 1, the oil supply system is configured, for example and without limitation, as follows:

an oil supply pipeline 5 arranged in the main spindle box 1;

the oil inlet pipeline 6 corresponds to the bearing 2 and is arranged in the corresponding bearing 2, one end part of the oil inlet pipeline 6 is communicated with the oil supply pipeline 5, and the other end part of the oil inlet pipeline 6 is communicated with the corresponding oil cavity 4;

the oil pump 7 is connected with the oil supply pipeline 5, and the oil pump 7 is suitable for pumping oil into the oil supply pipeline 5 and further into the oil cavity 4 so as to form certain oil pressure in the oil cavity 4 and further enable the shaft core 3 to float; specifically, the oil inlet pipelines 6 correspond to the bearings 2 one by one.

As shown in fig. 1 and 2, a recovery chamber 8 for recovering oil leaked from the oil chamber 4 may be provided in the spindle head 1;

an oil inlet of the oil pump 7 is connected with the recovery cavity 8;

an oil outlet of the oil pump 7 is connected with the oil supply pipeline 5; specifically, the oil outlet of the oil pump 7 is connected with the oil supply pipeline 5 through an oil conveying pipe, and a filter is connected in the oil conveying pipe so as to filter out impurities in oil liquid and ensure that the oil liquid is clean.

Further specifically, axle core 3 with be formed with behind the bearing 2 normal running fit and be located bearing 2 with oil pocket 4 between the axle core 3 and being located bearing 2 with between the axle core 3 and being located oil pocket 4 oil blanket all around, fluid in the oil pocket 4 is followed flow to after flowing in the oil blanket in retrieving the chamber 8, because the damping action in the little clearance of oil blanket, fluid is followed receive very big resistance when the oil blanket flows, make fluid in the oil pocket 4 continues to keep certain pressure, thereby can with axle core 3 floats. The oil sealing surface is a working surface surrounding an oil cavity 4 in the hydrostatic bearing 2 and the hydrostatic bearing 2, and the oil sealing surface is an existing concept.

As shown in fig. 3, a pressure detection hole 9 communicating with the oil chamber 4 and adapted to mount a pressure gauge is provided in the bearing 2 so as to detect the oil pressure in the oil chamber 4 by the pressure gauge.

As shown in fig. 1 and 2, the bearing 2 may be provided with two bearings, one of which is a front bearing 10 mounted on the front end portion of the spindle head 1, and the other of which is a rear bearing 11 mounted on the rear end portion of the spindle head 1;

the motor apparatus 100 is, for example, but not limited to, a structure including a housing 12, a stator 13, and a rotor 14; wherein,

the outer sleeve 12 is connected to the rear bearing 11 and sleeved outside the rear end part of the shaft core 3;

the stator 13 is arranged between the outer sleeve 12 and the shaft core 3 and is connected to the outer sleeve 12;

the rotor 14 is installed between the stator 13 and the shaft core 3 and is coupled to a rear end portion of the shaft core 3.

As shown in fig. 1 and 2, a spiral cooling groove 15 may be provided between the outer circumferential portion of the stator 13 and the outer jacket 12;

the outer sleeve 12 is provided with a cooling inlet 16 communicated with one end part of the spiral cooling groove 15 and a cooling outlet 17 communicated with the other end part of the spiral cooling groove 15, so that the motor device can be cooled.

As shown in fig. 2, a magnetic grid drum 18 is directly or indirectly connected to the shaft core 3;

a reading head 19 which is suitable for being matched with the magnetic grid drum 18 to read the rotating speed of the shaft core 3 is directly or indirectly connected to the stator 13; in this embodiment, the shaft core 3 is provided with a magnetic grid mounting spacer 20, the magnetic grid drum 18 is connected to the magnetic grid mounting spacer 20, the stator 13 is provided with a connecting plate 21, and the reading head 19 is connected to the connecting plate 21; specifically, the specific structures of the grating drum 18 and the reading head 19 are well known in the prior art, and are not described in detail in this embodiment.

As shown in fig. 1, 2 and 4, the outer casing 12 is further connected with a rear end cover 22, an installation cavity 23 is arranged in the rear end cover 22, and both the magnetic grid drum 18 and the reading head 19 are located in the installation cavity 23;

the shaft core 3 is connected with a dynamic balance ring 24 which is suitable for adjusting the balance grade when the shaft core 3 rotates; specifically, the rear end cover 22 is further provided with an encoder outlet hole 43 and a motor outlet hole 44.

As shown in fig. 2, the rear end cap 22 may be provided with a shaft hole 25 adapted to the shaft core 3, and a rear sealing gap 26 is formed between the shaft hole 25 and the shaft core 3 in a matching manner;

a front sealing gap 27 is formed between the front bearing 10 and the shaft core 3 in a matching way;

the rear end cover 22 is further provided with an air inlet hole 28 communicated with the rear sealing gap 26, the air inlet hole 28 is further communicated with the front sealing gap 27 through an air pipeline, the air inlet hole 28 is suitable for introducing air to form air seal in the front sealing gap 27 and the rear sealing gap 26 so as to isolate the internal and external environments of the turning hydrostatic pressure electric spindle, so that external impurities are not easy to enter the interior of the turning hydrostatic pressure electric spindle, and the liquid in the interior is not easy to leak to the exterior; a sealing ring is also mounted in the rear sealing gap 26.

As shown in fig. 1 and 2, the front bearing 10 may include a front axial portion 29 fittingly coupled in the headstock 1 and a front radial portion 30 coupled to a front end portion of the front axial portion 29 and extending outward;

the rear bearing 11 may include a rear axial portion 31 fittingly coupled in the headstock 1 and a rear radial portion 32 coupled to a rear end portion of the rear axial portion 31 and extending outward;

a boss part 33 is arranged on the shaft core 3 and is positioned between the front axial part 29 and the rear axial part 31, and the boss part 33 is used for being matched with the front axial part 29 and the rear axial part 31 to limit the axial position of the shaft core 3;

an adjusting pad 34 adapted to adjust a distance between the front bearing 10 and the rear bearing 11 in the axial direction of the spindle core 3 is installed between the spindle head 1 and the front radial portion 30 and/or between the spindle head 1 and the rear radial portion 32; specifically, by adjusting the distance between the front bearing 10 and the rear bearing 11, the distance between the front axial portion 29 and the rear axial portion 31 can be adjusted, and further, the end surface gap between the boss portion 33 and the front axial portion 29 and the end surface gap between the boss portion 33 and the rear axial portion 31 can be adjusted.

In this embodiment, the adjusting pad 34 is disposed between the main spindle box 1 and the rear radial portion 32, the gas pipeline includes a first pipeline 35 disposed in the rear end cover 22, a second pipeline 36 disposed in the outer sleeve 12, a third pipeline 37 disposed in the rear radial portion 32, a fourth pipeline 38 disposed in the adjusting pad 34, a fifth pipeline 39 disposed in the main spindle box 1, and a sixth pipeline 40 disposed in the front radial portion 30, and the first pipeline 35, the second pipeline 36, the third pipeline 37, the fourth pipeline 38, the fifth pipeline 39, and the sixth pipeline 40 are connected end to form the gas pipeline.

In this embodiment, the turning hydrostatic spindle further includes a front end cap 41 sleeved on the shaft core 3 and abutting against the front radial portion 30, and a transition flange 42 connected to the shaft core 3 and adapted to limit the front end cap 41 on the shaft core 3 to prevent the front end cap 41 from falling off.

The working principle of the utility model is as follows:

the oil supply system injects oil with certain pressure into the oil cavity 4, and when the resultant pressure formed by the pressure of the oil in the oil cavity 4 is balanced with the load on the shaft core 3, the shaft core 3 floats in the bearing 2 along the radial direction; the motor arrangement 100 then drives the shaft core 3 in rotation in the bearing 2. Wherein, motor device 100 with the back end connection of axle core 3, bearing 2 with the preceding end connection of axle core 3, work as when motor device 100 trouble needs the maintenance, only need directly disassemble motor device 100 can, and need not dismantle bearing 2 has reduced the degree of difficulty of dismouting maintenance, has saved dismouting time, has practiced thrift the time cost, has still saved the cost of labor.

The above-mentioned embodiments further explain in detail the technical problems, technical solutions and advantages solved by the present invention, and it should be understood that the above only is a specific embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

In the description of the present invention, it is to be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the present disclosure, unless otherwise expressly stated or limited, the first feature may comprise both the first and second features directly contacting each other, and also may comprise the first and second features not being directly contacting each other but being in contact with each other by means of further features between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.

Claims

1. A hydrostatic turning spindle, comprising:

a main spindle box (1);

at least one bearing (2), wherein the bearing (2) is connected in the main spindle box (1);

the front end part of the shaft core (3) is rotatably connected in the bearing (2), and an oil cavity (4) is arranged between the outer peripheral part of the shaft core (3) and the bearing (2);

an oil supply system communicating with the oil chamber (4) and adapted to inject oil under pressure into the oil chamber (4) to float the shaft core (3) in the bearing (2);

the motor device (100) is connected with the rear end part of the shaft core (3) and is suitable for acting after oil is injected into the oil cavity (4) so as to drive the shaft core (3) to rotate in the bearing (2).

2. The turning hydrostatic motorized spindle of claim 1, wherein the oil supply system comprises:

an oil supply pipeline (5) arranged in the spindle box (1);

the oil inlet pipeline (6) corresponds to the bearing (2) and is arranged in the corresponding bearing (2), one end part of the oil inlet pipeline (6) is communicated with the oil supply pipeline (5), and the other end part of the oil inlet pipeline (6) is communicated with the corresponding oil cavity (4);

and the oil pump (7) is connected with the oil supply pipeline (5), and the oil pump (7) is suitable for pumping oil into the oil supply pipeline (5) and then into the oil cavity (4).

3. The hydrostatic turning spindle according to claim 2, characterized in that a recovery chamber (8) for recovering oil leaked from the oil chamber (4) is provided in the spindle head (1);

an oil inlet of the oil pump (7) is connected with the recovery cavity (8);

and an oil outlet of the oil pump (7) is connected with the oil supply pipeline (5).

4. The hydrostatic turning spindle according to claim 1, characterized in that the bearing (2) has a pressure detection hole (9) therein communicating with the oil chamber (4) and adapted to receive a pressure gauge.

5. The turning hydrostatic motorized spindle of claim 1,

the two bearings (2) are arranged, one of the bearings is a front bearing (10) arranged on the front end part of the spindle box (1), and the other bearing is a rear bearing (11) arranged on the rear end part of the spindle box (1);

the motor device (100) comprises an outer casing (12), a stator (13) and a rotor (14); wherein,

the outer sleeve (12) is connected to the rear bearing (11) and sleeved outside the rear end part of the shaft core (3);

the stator (13) is arranged between the outer sleeve (12) and the shaft core (3) and is connected to the outer sleeve (12);

the rotor (14) is installed between the stator (13) and the shaft core (3) and connected to a rear end portion of the shaft core (3).

6. The turning hydrostatic motorized spindle of claim 5,

a spiral cooling groove (15) is arranged between the outer peripheral part of the stator (13) and the outer sleeve (12);

and the outer sleeve (12) is provided with a cooling inlet (16) communicated with one end part of the spiral cooling groove (15) and a cooling outlet (17) communicated with the other end part of the spiral cooling groove (15).

7. Hydrostatic turning spindle according to claim 5, characterized in that a magnetic grid drum (18) is directly or indirectly connected to the spindle core (3);

a reading head (19) which is suitable for being matched with the magnetic grid drum (18) to read the rotating speed of the shaft core (3) is directly or indirectly connected to the stator (13).

8. The turning hydrostatic motorized spindle of claim 7,

the outer sleeve (12) is further connected with a rear end cover (22), an installation cavity (23) is formed in the rear end cover (22), and the magnetic grid drum (18) and the reading head (19) are located in the installation cavity (23);

and/or a dynamic balance ring (24) suitable for adjusting the balance grade of the shaft core (3) during rotation is connected to the shaft core (3).

9. The turning hydrostatic motorized spindle of claim 8,

the rear end cover (22) is provided with a shaft hole (25) matched with the shaft core (3), and a rear sealing gap (26) is formed between the shaft hole (25) and the shaft core (3) in a matched manner;

a front sealing gap (27) is formed between the front bearing (10) and the shaft core (3) in a matching manner;

the rear end cover (22) is further provided with an air inlet hole (28) communicated with the rear sealing gap (26), the air inlet hole (28) is further communicated with the front sealing gap (27) through an air pipeline, and the air inlet hole (28) is suitable for introducing air to form air seal in the front sealing gap (27) and the rear sealing gap (26);

a sealing ring is also mounted in the rear sealing gap (26).

10. The turning hydrostatic motorized spindle of claim 5,

the front bearing (10) comprises a front axial part (29) which is matched and connected in the spindle box (1) and a front radial part (30) which is connected on the front end part of the front axial part (29) and extends outwards;

the rear bearing (11) comprises a rear axial part (31) which is matched and connected in the spindle box (1) and a rear radial part (32) which is connected on the rear end part of the rear axial part (31) and extends outwards;

a boss portion (33) is arranged on the shaft core (3) and located between the front axial portion (29) and the rear axial portion (31), and the boss portion (33) is used for being matched with the front axial portion (29) and the rear axial portion (31) to limit the axial position of the shaft core (3);

an adjusting pad (34) suitable for adjusting the distance between the front bearing (10) and the rear bearing (11) in the axial direction of the shaft core (3) is mounted between the spindle box (1) and the front radial portion (30) and/or between the spindle box (1) and the rear radial portion (32).