CN113043031A

CN113043031A - Numerical control machine tool turntable

Info

Publication number: CN113043031A
Application number: CN202110318610.6A
Authority: CN
Inventors: 罗国栋; 刘群; 刘中启; 赵金刚; 单既强; 闫方清; 王文广
Original assignee: Himile Mechanical Science and Technology Shandong Co Ltd
Current assignee: Shandong Haomai Cnc Machine Tool Co ltd
Priority date: 2021-03-25
Filing date: 2021-03-25
Publication date: 2021-06-29
Anticipated expiration: 2041-03-25
Also published as: CN113043031B

Abstract

The invention relates to a numerical control machine tool turntable, which comprises: a housing; a motor; a central shaft disposed in the housing and drivingly coupled to the motor, whereby the motor is capable of driving the central shaft to rotate; and the sealing unit is arranged in the joint of the central shaft and the shell, and fluid sealing is provided between the central shaft and the shell, wherein the shell comprises a brake pressing ring fixed in the shell, the numerical control machine turntable further comprises an isolation protection unit, the isolation protection unit comprises an isolation groove and a liquid cavity, the isolation groove is arranged on the central shaft, the liquid cavity is a gap between the shell and the brake pressing ring, the shell further comprises a main leakage passage and a front end leakage passage, and the front end leakage passage is used for communicating the isolation protection unit with the main leakage passage in a fluid mode.

Description

Numerical control machine tool turntable

Technical Field

The invention relates to a numerical control machine tool turntable, in particular to a numerical control machine tool turntable with a leakage protection and leakage detection structure.

Background

The existing numerical control machine tool rotary table adopts a direct drive motor, and no intermediate transmission link exists in the transmission process, so that no transmission abrasion exists, the structure is simple, and the maintenance is convenient.

The numerical control machine tool rotary table is mainly used for machining parts, and the parts are driven to rotate to an angle suitable for cutting through the rotary table. The front end of the turret, in particular the junction of the central shaft with the housing, is therefore generally subject to the risk of infiltration of liquids such as cutting fluids, the present numerically controlled machine turrets having a sealing unit to prevent the infiltration of liquids, but the seal is difficult to avoid in case of failure. In addition, the motor of digit control machine tool revolving stage can send a large amount of heats when using, thereby need let in the cooling water to motor housing and cool off the motor, but the condition of revealing can appear in the circulation of cooling water.

The direct-drive turntable on the market at present has the defects that liquid protection is unreliable and liquid permeating into the turntable cannot be effectively monitored. The problem that the bearing in the rotary table is lubricated to lose efficacy, the motor is soaked in water to be damaged, the inside of the rotary table is rusted and the like is caused by the fact that cooling liquid leaks or external cutting liquid permeates into the rotary table frequently in the rotary table of the numerical control machine.

Therefore, there is still a need for further improvements of existing numerically controlled machine turrets.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: preventing liquid from entering the interior of the turntable in the event of a seal leak. In order to solve the above problems, the present invention provides a numerical control machine turret, comprising: a housing; a motor; a central shaft disposed in the housing and drivingly coupled to the motor, whereby the motor is capable of driving the central shaft to rotate; and the sealing unit is arranged in the joint of the central shaft and the shell and provides fluid seal between the central shaft and the shell, wherein the numerical control machine turntable further comprises an isolation protection unit, the isolation protection unit comprises an isolation groove and a liquid cavity body, the isolation groove is arranged on the central shaft and the liquid cavity body is arranged on the shell, the shell further comprises a main leakage passage and a front end leakage passage, and the front end leakage passage is used for communicating the isolation protection unit with the main leakage passage in a fluid mode.

According to one aspect of the invention, the housing further comprises a brake collar fixed therein, and the compliant chamber of the isolation and protection unit is a gap between the housing and the brake collar, the isolation and protection unit further comprising an inclined surface configured on the brake collar and forming a preset angle with the vertical direction.

According to an aspect of the present invention, the housing further includes a front end cap disposed at a front end of the housing and shielding the sealing unit from being exposed to an external environment, and wherein the compliant chamber is constituted by a gap between the front end cap and the brake ring.

According to one aspect of the invention, the sealing unit comprises a sealing member and a sealing chamber housing the sealing member, the sealing chamber being defined by a counter-sunk platform on the central shaft and a counter-sunk platform on the front end cover.

According to one aspect of the invention, the electric machine is disposed in a housing and includes a rotor drivingly coupled to a housing stator and to the central shaft, and the housing further includes a rear end cap disposed at a rear end of the housing and shielding the electric machine from exposure to an external environment.

According to one aspect of the invention, the housing further comprises at least one motor leakage path, the at least one motor leakage path being in fluid communication with a seal for sealing the motor, and the primary leakage path being in fluid communication with the at least one motor leakage path.

According to one aspect of the present invention, the at least one motor leakage path includes a first motor leakage path and a second motor leakage path.

According to one aspect of the invention, the housing further includes a vent in fluid communication with an environment external to the housing, and the primary leak path is in fluid communication with the vent to vent leaked liquid into the environment external to the housing.

According to an aspect of the invention, the numerically controlled machine turntable further comprises a leakage cavity, and the main leakage pathway is in fluid communication with the leakage cavity to discharge leaked liquid into the leakage cavity.

According to one aspect of the invention, a liquid detection element is provided in the leakage chamber and sends a leakage signal to the control system of the numerically controlled machine turret upon detecting the presence of liquid.

Compared with the existing numerical control machine tool rotary table, the numerical control machine tool rotary table can be realized only by adding the isolation protection unit with a simple structure, has good universality and is easy to realize in the assembling process. Inside adding the isolated groove and having prevented that liquid from getting into the revolving stage on the center pin, cutting fluid and the motor coolant liquid through following the liquid cavity and revealing the passageway and guaranteeing to leak can derive digit control machine tool revolving stage shell to can in time inform the operator when the leakage condition, reduce the risk of revolving stage sealing failure.

Drawings

Fig. 1 is a schematic view of a numerically controlled machine tool turret according to a preferred embodiment of the present invention;

fig. 2 is a partially enlarged view of a turn table of the numerically controlled machine tool of fig. 1.

List of reference numerals:

10 outer casing

11 front end cover

12 rear end cap

13 sink table

15 brake clamping ring

20 electric machine

21 rotor

22 stator

30 center shaft

31 sink table

40 sealing unit

41 seal

42 sealed cavity

50 isolation protection unit

51 isolation groove

52 bevel

53 compliant cavity

60 main leakage path

61 front end leakage path

62 first motor leakage path

63 second Motor leakage pathway

65 machining hole

70 leaking out of the cavity.

Detailed Description

The present invention is further described in the following description with reference to specific embodiments and the accompanying drawings, wherein the details are set forth in order to provide a thorough understanding of the present invention, but it is apparent that the present invention can be embodied in many other forms different from those described herein, and it will be readily appreciated by those skilled in the art that the present invention can be implemented in many different forms without departing from the spirit and scope of the invention.

In an embodiment of the invention, the "axial direction" is defined as the direction of the rear end cap-central axis-front end cap, and is the negative of the axial direction towards the rear end cap.

In an embodiment of the invention, the "vertical direction" is defined as the direction of the housing-central axis-leakage path and is the negative of the vertical direction towards the leakage path.

Fig. 1 is a schematic view of a numerically controlled machine tool turret according to a preferred embodiment of the present invention, which includes a housing 10 disposed at the outermost side, a motor 20 disposed in the housing 10, a center shaft 30 inserted in the housing 10 from the front, and a sealing unit 40 disposed in a connection of the center shaft 30 and the housing 10.

In one embodiment, the motor 20 is disposed in the housing 10 and includes a stator 22 and a rotor 21, the stator 22 being fixed to the housing 10, the rotor 21 being drivingly coupled with the central shaft 30, whereby the motor 20 is capable of selectively driving the central shaft 30 in rotation. Further, in the preferred embodiment, the housing 10 also includes a rear end cap 12, the rear end cap 12 being disposed at the rear end of the housing 10 and shielding the motor 20 from exposure to the environment. It will be appreciated that the motor 20 may be located outside the numerically controlled machine turret and still be drivingly coupled to the central shaft 30.

Fig. 2 is a partially enlarged view of a turn table of the numerically controlled machine tool of fig. 1. In a preferred embodiment, the sealing unit 40 includes a sealing member 41 and a sealing cavity 42 accommodating the sealing member 41. The seal 41 is a rotary seal, such as an O-ring, star ring, quad ring, backbone oil seal, or the like, and is preferably a backbone oil seal. As shown in fig. 2, a sealing member 41 is installed at the center shaft 30 near the front side of the housing 10 for sealing between the rotating center shaft 30 and the housing to prevent external cutting fluid from entering the inside of the turn table of the numerical control machine.

In one embodiment, the housing 10 further includes a front cover 11, and the front cover 11 is disposed at a front end of the housing 10 and shields the sealing unit 40 from being exposed to the environment. A seal chamber 42 containing a seal 41 is defined by a counter 31 on the central shaft 30 and a counter 13 on the front end cap 11.

In a preferred embodiment of the invention, the housing 10 further includes a brake collar 15 secured therein, which is secured to the housing 10 by fasteners.

In a preferred embodiment of the present invention, as shown in fig. 1, 2, the housing 10 further includes an isolation guard unit 50. The isolation guard unit 50 includes at least one isolation groove 51 configured on the center shaft 30 in the form of a ring groove or a plurality of ring grooves arranged side by side in the axial direction by machining. In addition, the isolation protection unit 50 further includes a compliant cavity 53, which is a gap between the housing 10 and the brake compression ring 15. In the preferred embodiment, a gap is defined between the side surface of the front end cover 11 and the side surface of the brake pressing ring 15, and the distance between the side surfaces is greater than or equal to 0.5mm, and the gap is the compliant cavity 53.

According to the numerically controlled machine tool turret of the present invention, when the sealing unit 40 is slightly leaked, the cutting fluid flows toward the inside of the turret along the central axis 30, i.e., toward the negative direction in the axial direction. At this time, the separation grooves 51 on the central shaft 30 can block the penetration of the liquid, accumulate in the separation grooves 51 by the surface tension of the liquid, and no longer continue to flow along the central shaft toward the inside of the turntable; when the amount of the liquid that has permeated is accumulated to a certain amount, the liquid drops from the separation groove 51 by the action of gravity, flows into the liquid flowing chamber 53, and continues to flow downward along the liquid flowing chamber 53 by the action of gravity, that is, flows in a negative direction in the vertical direction. Therefore, the conditions that the working of the turntable component is not facilitated, such as rusting of the brake pad soaked in water, service life loss of the bearing soaked in water, burning of the motor soaked in water and the like caused by liquid permeation due to failure of the sealing structure, can be avoided.

Furthermore, in a preferred embodiment of the present invention, isolation guard unit 50 preferably further comprises a ramp 52. The ramp 52 is configured on the brake collar 15 and is at a predetermined angle to the vertical in the range of 0 ° to 90 °, and preferably in the range of 30 ° to 60 °. According to the numerically controlled machine tool turret of the present invention, when a slight leakage occurs in the sealing unit 40, the separation groove 51 of the central shaft 30 can block the penetration of the liquid, and the liquid is dropped from the separation groove 51 onto the inclined surface 52 by the gravity, and the inclined surface 52 guides the dropped liquid to easily flow into the down-flow cavity 53.

In one embodiment, housing 10 further includes a main leakage path 60 and a front end leakage path 61. The front end leakage path 61 may be fluidly routed as desired such that one end of the front end leakage path 61 is in fluid communication with the downstream cavity 53 of the isolation and protection unit 50 and the other end is in fluid communication with the main leakage path 60 to fluidly communicate the downstream cavity 53 with the main leakage path 60. In one embodiment, a primary leak path 60 may be configured in the bottom of housing 10 for conducting leaked liquid out of the numerically controlled machine turntable housing. In a preferred embodiment, as shown in FIG. 1, the primary leakage path 60 is disposed parallel to the axial direction of the center shaft 30 and is configured near the bottom side of the housing 10.

In one embodiment, the housing 10 further includes at least one motor leakage path having one end in fluid communication with a sealing unit for sealing the motor 20 and the other end in fluid communication with the main leakage path 60. When the sealing unit for the motor fails and cooling water for cooling the motor housing leaks, at least one motor leakage path can drain the leaked cooling liquid to the main leakage path 60 in time. In a preferred embodiment, as shown in FIG. 1, the housing 10 includes a first or pre-motor leakage path 62 and a second or post-motor leakage path 63, which communicate to the front and rear ends of the motor stator 22, respectively.

In one embodiment, as shown in fig. 1, the housing 10 may further include a machined hole 65 at the bottom for machining the first motor leakage path 62 and sealing it after machining.

In one embodiment, as shown in fig. 1, the numerically controlled machine turret may further include a leakage cavity 70. A leakage cavity 70 is provided at the bottom of the housing 10 from the rear attachment, and the primary leakage path 60 is in fluid communication with the leakage cavity 70 to discharge leaked liquid into the leakage cavity 70. It will be appreciated that the leak chamber 70 may be eliminated and the primary leak path 60 fluidly connected to the external environment to vent the housing 10 to the external environment of the housing 10. It will be appreciated that the leakage cavity 70 may be located elsewhere in the housing or within the housing as desired. Preferably, a liquid detection element is provided in the leakage chamber 70, which outputs a leakage signal when the presence of liquid is detected, and transmits the leakage signal to a control system of the numerically controlled machine turret. The system can change light, color and sound, and inform an operator in time, so that the risk of sealing failure of the rotary table is reduced.

By adopting the numerical control machine tool turntable, the separation groove is added on the central shaft, so that the permeated liquid is blocked and does not continuously flow inwards along the central shaft, and the permeated liquid can drip after accumulating a certain amount and flows into the liquid flowing cavity.

The leakage cutting fluid and the motor cooling fluid can be led out of the rotary table shell of the numerical control machine tool through the fluid cavity and the leakage passage, and the working condition of the rotary table parts such as a brake pad, a bearing and a motor cannot be influenced by the penetration of the fluid.

In addition, the numerical control machine tool rotary table is additionally provided with a liquid leakage detection structure, so that an operator can be informed in time in case of leakage, the risk of sealing fault of the rotary table is reduced, the leakage condition of the rotary table can be found in time and maintained in time in the using process, and greater loss is avoided.

While various embodiments have been described above, it should be understood that they have been presented by way of example only, and not limitation. It will be apparent to those skilled in the relevant art that the disclosed subject matter can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, and not restrictive.

Claims

1. A numerically controlled machine turret, comprising:

a housing (10);

a motor (20);

a central shaft (30), said central shaft (30) being disposed in said housing (10) and being drivingly coupled with said motor (20), whereby said motor (20) is capable of driving said central shaft (30) in rotation; and

a sealing unit (40), the sealing unit (40) being provided in a junction of the center shaft (30) and the housing (10),

it is characterized in that the preparation method is characterized in that,

digit control machine tool revolving stage still includes isolation protection unit (50), isolation protection unit (50) are including isolation groove (51) and in the same direction as liquid cavity (53), isolation groove (51) set up on center pin (30), in the same direction as liquid cavity (53) set up on shell (10), and

the housing (10) further includes a main leakage path (60) and a front end leakage path (61), the front end leakage path (61) fluidly communicating the isolation barrier unit (50) with the main leakage path (60).

2. Numerically controlled machine tool turret according to claim 1,

the housing (10) further comprises a brake clamping ring (15) fixed therein, and the compliant cavity (53) of the isolation protection unit (50) is a gap between the housing (10) and the brake clamping ring (15),

the isolation protection unit (50) further comprises an inclined surface (52), wherein the inclined surface (52) is formed on the brake pressing ring (15) and forms a preset angle with the vertical direction.

3. Numerically controlled machine tool turret according to claim 2,

the housing (10) further comprises a front end cap (11), the front end cap (11) is arranged at the front end of the housing (10) and shields the sealing unit (40) from being exposed to the external environment, and the liquid guiding cavity (53) is formed by a gap between the front end cap (11) and the brake pressing ring (15).

4. Numerically controlled machine tool turret according to claim 3,

the sealing unit (40) comprises a sealing element (41) and a sealing cavity (42) for accommodating the sealing element (41), wherein the sealing cavity (42) is defined by a sunken platform (31) on the central shaft (30) and a sunken platform (13) on the front end cover (11).

5. Numerically controlled machine tool turret according to claim 1,

the electric motor (20) is disposed in the housing (10) and includes a stator (22) fixed to the housing (10) and a rotor (21) drivingly coupled with the central shaft (30), and

the housing (10) further comprises a rear end cap (12), the rear end cap (12) being disposed at a rear end of the housing (10) and shielding the motor (20) from exposure to an external environment.

6. Numerically controlled machine tool turret according to claim 1,

the housing (10) further includes at least one motor leakage path (62, 63), the at least one motor leakage path (62, 63) being in fluid communication with a seal for sealing the motor (20), and the primary leakage path (60) being in fluid communication with the at least one motor leakage path (62, 63).

7. Numerical control machine turret according to claim 6,

the at least one motor leakage path (62, 63) includes a first motor leakage path (62) and a second motor leakage path (63).

8. Numerical control machine turret according to claim 7,

the housing (10) further comprises a machining hole (65), and the machining hole (65) is used for machining the first motor leakage path (62) and is sealed after machining.

9. Numerically controlled machine tool turret according to claim 1,

the numerically controlled machine turret further comprises a leakage cavity (70) and the primary leakage path (60) is in fluid communication with the leakage cavity (70) to discharge leaked liquid into the leakage cavity (70).

10. Numerically controlled machine tool turret according to claim 9,

and a liquid detection element is arranged in the leakage cavity (70), and the liquid detection element sends a leakage signal to a control system of the numerical control machine turntable when detecting that liquid exists.