JP6088816B2 - Lubricating oil recovery device - Google Patents

Description

  The present invention relates to a lubricating oil recovery device for recovering lubricating oil supplied to, for example, a spindle device of a machine tool.

  2. Description of the Related Art Conventionally, for example, a spindle device of a machine tool is provided with a lubricating oil supply device that supplies lubricating oil to the bearings by jetting the bearings to lubricate the bearings. However, if only lubricating oil is supplied, it will be excessively supplied, resulting in poor lubrication. Therefore, conventionally, as disclosed in, for example, Patent Document 1, a lubricating oil suction passage is formed in the main shaft device, and the suction device is directly connected to the suction passage to recover the lubricating oil of the bearing. . In view of cost and the like, there is a case where the air is directly discharged from the suction path to the atmosphere without installing a suction device or the like.

JP 2003-232371 A

However, if the suction device is directly connected to the suction path formed in the main shaft device, there is a problem that the pressure balance in the lubrication portion such as the bearing may be lost. That is, if the suction pressure of the suction device is too large, the lubricating oil of the bearing will be sucked more than necessary, while if the suction pressure is too small, a sufficient amount of lubricating oil cannot be sucked. Lubrication failure will occur. In addition, if a suction device capable of finely changing the suction pressure is prepared, the cost increases.
Furthermore, when directly discharged into the atmosphere, there is a problem that the atmosphere is polluted by the lubricating oil of the main spindle device, resulting in a deterioration of the working environment.

  Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a lubricating oil recovery device that can easily prevent the occurrence of poor lubrication and does not cause deterioration of the working environment. Is.

In order to achieve the above object, the invention according to claim 1 of the present invention is characterized in that a rotating shaft, a bearing supporting the rotating shaft, and lubricating oil supplied to the bearing are discharged out of the fuselage. For a rotating shaft device having a lubricating oil discharge path, a recovery tank for recovering the lubricating oil discharged from the lubricating oil discharge path, and interposed between the recovery tank and the lubricating oil discharge path, A lubricating oil recovery device comprising a suction device for sucking lubricating oil from a bearing into the lubricating oil discharge passage, wherein a relay device having a space inside is interposed between the suction device and the lubricating oil discharge passage. The relay device and the lubricating oil discharge passage are connected by a first flow path, the relay device and the suction device are connected by a second flow path, and an internal space and outside air are communicated to the relay device. A communication part is provided, and suction is performed by the suction device. The time, takes in outside air through the communicating portion in the relay device, the lubricating oil has reached the relay device via the first flow path, wherein the recovery tank side through the second flow path with the outside air It can be collected.
The invention described in claim 2 is characterized in that, in the invention described in claim 1, the relay device is installed outside a processing space in which the rotating shaft device is installed.
Furthermore, the invention described in claim 3 is characterized in that the relay device is provided with an opening degree adjusting mechanism capable of adjusting the opening degree of the communication portion, and the intake amount of outside air can be adjusted.

According to the present invention, by interposing a relay device having a communication portion between the suction device and the lubricating oil discharge passage, when the lubricating oil in the bearing is sucked by the suction device, the relay device is connected via the communication portion. Lubricating oil that has taken in outside air and has reached the relay device via the first flow path can be recovered along with the outside air to the collection tank side via the second flow path. That is, at the time of suction, the suction pressure is adjusted by taking in outside air in the relay device. Therefore, without adjusting the suction pressure on the suction device side, the lubricating oil can be collected smoothly and surely without breaking the pressure balance at the bearing, and it is easy for the bearing to cause poor lubrication. And it can prevent effectively. Further, it is not necessary to prepare an expensive device that can change the suction pressure, and the cost can be reduced. Furthermore, since the lubricating oil is not released to the atmosphere, the working environment is not deteriorated.
In addition, according to the invention described in claim 2, since the relay device is installed outside the processing space, it is possible to prevent foreign matter from being mixed into the lubricating oil without sucking chips or coolant scattered by the processing. Can be prevented.
Furthermore, according to the invention described in claim 3, since the opening adjustment mechanism capable of adjusting the opening of the communication portion is provided in the relay device so that the intake amount of the outside air can be adjusted, the lubricating oil to the bearing can be adjusted. The suction pressure can be easily finely adjusted according to the supply pressure and the like, and as a result, the occurrence of poor lubrication can be prevented more easily and effectively.

It is explanatory drawing which showed the outline of the main axis | shaft apparatus, the lubricating oil supply apparatus, and the lubricating oil collection | recovery apparatus. It is explanatory drawing which showed the detail of the relay apparatus of a lubricating oil collection | recovery apparatus.

  Hereinafter, a lubricating oil recovery apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an explanatory diagram showing an outline of the spindle device 1, the lubricating oil supply device 2, and the lubricating oil recovery device 3. FIG. 2 is an explanatory view showing details of the relay device 4 of the lubricating oil recovery device 3. In FIG. 1, a drain tube 33 described later is omitted.
The spindle device 1 is configured in substantially the same manner as a conventionally known spindle device represented by Patent Document 1, and the spindle 12 can be rotated in a housing 10 via a plurality of bearings 11, 11. Support. Further, in the housing 10, lubricating oil supply passages 13, 13... For supplying lubricating oil from the outside of the machine body to the bearing 11, and a lubricating oil discharge path 14 for discharging the lubricating oil from the bearing 11 to the outside of the machine body, 14.. Are provided, and a nozzle 15 for ejecting the lubricating oil in a mist shape is installed at the end of each lubricating oil supply passage 13 on the bearing 11 side. On the other hand, the lubricating oil supply device 2 also has a conventionally well-known configuration, and includes a supply tank 20 in which lubricating oil is stored, a supply tube 21 that connects the supply tank 20 and the lubricating oil supply paths 13, 13. 21... And a drive device (not shown), and the lubricating oil in the supply tank 20 can be supplied to the bearing 11 in the form of a mist through the supply tube 21, the lubricating oil supply path 13, and the nozzle 15. ing. In addition, S is a processing space, and the supply tank 20 is installed outside the processing space S. The operations of the spindle device 1, the lubricating oil supply device 2, and the lubricating oil recovery device 3 described later are controlled by an NC device (not shown).

Here, the lubricating oil collection | recovery apparatus 3 used as the principal part of this invention is demonstrated.
The lubricating oil recovery device 3 includes a recovery tank 6 for recovering the lubricating oil discharged from the lubricating oil discharge passage 14, a relay device 4 interposed between the lubricating oil discharge passage 14 and the recovery tank 6, and a relay device 4. Between the suction device 5 and the recovery tank 6 and connecting the suction device 5 for sucking the lubricating oil in the bearing 11, the relay device 4 and the lubricating oil discharge passages 14, 14. A suction tube 32 that connects the relay device 4 and the suction device 5, a drain tube 33 that discharges the drain in the relay device 4, and a recovery tube 34 that connects the suction device 5 and the recovery tank 6 are provided. The relay device 4 includes a relay tank 41 having a space inside and opening on the upper surface, and a cover 42 covering the opening of the relay tank 41. The cover 42 is in a state in which a gap 43 is formed between the cover 42 and the upper surface of the relay tank 41 (that is, a state in which the space in the relay tank 41 communicates with the space outside the relay tank 41 through the gap 43). It is attached with.

Further, the cover 42 is provided with a cylinder device (opening adjustment mechanism) (not shown) that expands and contracts under the control of the NC device and moves the cover 42 close to / separating from the relay tank 41. And the space | interval of the clearance gap 43 (namely, the opening degree of a communication part) can be adjusted by making the cover 42 approach / separate.
Further, the discharge tanks 31, 31... And the drain tube 33 are connected to the relay tank 41, and the suction tube 32 is connected to the cover 42. The relay device 4 is installed outside the processing space S.

  And in the said lubricating oil collection | recovery apparatus 3, a suction | attraction force generate | occur | produces when the suction device 5 act | operates under control by NC apparatus, The mist-like lubricating oil which exists in the bearing 11 is made into the lubricating oil discharge path 14, Recovery is performed in the recovery tank 6 via the discharge tube 31, the relay device 4, the suction tube 32, the suction device 5, and the recovery tube 34. At this time, in the relay device 4, since the gap 43 is provided between the relay tank 41 and the cover 42, outside air is taken into the relay device 4 through the gap 43. The mist-like lubricating oil that has reached the relay tank 41 via the discharge tube 31 is collected from the suction tube 32 to the collection tank 6 together with the outside air. Further, the lubricating oil accumulated in the relay tank 41 is collected from the drain tube 33. Further, when it is desired to adjust the suction pressure by the supply pressure of the lubricating oil to the bearing 11, the cylinder device is driven to bring the cover 42 closer to / separated from the relay tank 41, and the amount of outside air taken into the relay device 4 Can be adjusted.

According to the lubricating oil recovery device 3 having the above configuration, the mist-like lubricating oil present in the bearing 11 is removed from the lubricating oil discharge passage 14 via the relay device 4 having the gap 43 that can take in outside air. In order to recover to the recovery tank 6, when a suction force is generated to recover the lubricating oil, outside air is taken in the relay device 4 and the suction pressure is adjusted. Therefore, even if the suction pressure is not adjusted on the suction device 5 side, the lubricating oil can be collected smoothly and reliably without breaking the pressure balance at the bearing 11, and poor lubrication occurs at the bearing 11. The situation can be easily and effectively prevented. Further, it is not necessary to prepare an expensive device that can change the suction pressure, and the cost can be reduced. Furthermore, since the lubricating oil is not released to the atmosphere, the working environment is not deteriorated.
In addition, an opening adjustment mechanism for moving the cover 42 closer to or away from the relay tank 41 is provided, so that the interval of the gap 43 can be adjusted simply by moving the cover 42, that is, the amount of outside air taken in can be finely adjusted. Further, the suction pressure can be easily adjusted according to the supply pressure of the lubricating oil to the bearing 11, and as a result, the occurrence of poor lubrication can be prevented more easily and effectively.

Furthermore, since the drain tube 33 is connected to the relay tank 41, the lubricating oil liquefied in the relay tank 41 can be recovered from the drain tube 33, and more reliable recovery of the lubricating oil can be realized. it can.
In addition, since the relay device 4 is installed outside the processing space S, it is possible to prevent foreign matter from being mixed into the lubricating oil without sucking chips, coolant, etc. scattered by processing.

  Note that the lubricating oil recovery apparatus according to the present invention is not limited to the aspect of the above embodiment, and the configuration according to the relay apparatus or the like is appropriately changed as necessary without departing from the gist of the present invention. can do.

For example, in the above-described embodiment, the gap 43 between the relay tank 41 and the cover 42 in the relay device 4 is a communication portion that communicates the space inside the relay device 4 with the outside air, but the relay tank 41 and the cover 42 are slit. It is also possible to adopt a configuration in which the communication portion is provided by forming the slab.
Moreover, in the said embodiment, the cylinder apparatus which adjoins / separates the cover 42 to the relay tank 41 is employ | adopted as an opening degree adjustment mechanism which adjusts the opening degree of a communication part, However, an adjustment valve is provided in a communication part, NC Adjust the opening of the communicating part by changing the attitude of the regulating valve by the device, or slidably attach a shielding plate that can cover the slit formed in the relay device, and change the covering ratio of the slit by the shielding plate Of course, it is possible to adopt other configurations such as adjusting the opening of the communicating portion. Note that it is possible to appropriately change whether the opening degree of the communication portion can be adjusted by an NC device or the like or can be manually adjusted by an operator.

Furthermore, it is also possible to employ a relay device that does not include an opening adjustment mechanism. Even in this case, it is possible to effectively prevent the occurrence of poor lubrication by preparing in advance a plurality of types of relay devices with different opening degrees of the communicating portion and using them properly according to the pressure situation at the bearing. In addition, since the relay device can be manufactured at a much lower cost than the suction device, there is also a cost advantage.
Furthermore, the shape and number of the lubricating oil discharge passages 14 and the like in the spindle device 1 can be changed as appropriate, and the number of the discharge tubes 31 can be changed as appropriate accordingly. Further, there is no problem even if only one relay device 4 is provided for one discharge tube 31 instead of connecting a plurality of discharge tubes 31 to one relay device 4.

In the above embodiment, the suction device 5 is interposed between the relay device 4 and the recovery tank 6, the relay device 4 and the suction device 5 are connected by the suction tube 32, and the suction device 5 and the recovery tank 6 are connected by the recovery tube. However, it is also possible to configure the suction device 5 so as to be integrated with the relay device 4 or the collection tank 6.
In addition, although the said embodiment demonstrated the lubricating oil collection | recovery apparatus which collect | recovers lubricating oil from the bearing 11 of the main shaft apparatus 1, it can utilize suitably also for apparatuses other than a main shaft apparatus.

  1 .... Spindle device (rotary shaft device) 3 .... Lubricating oil recovery device 4 .... Relay device 11 .... Bearing 12 .... Spindle (rotating shaft) 14, ... Lubricant oil discharge path 31, ... Discharge tube (first flow path), 32 .. Suction tube (second flow path), 33 .. Drain tube, 41 .... Relay tank, 42 ... Cover, 43 ... Clearance (communication part), S ...・ Processing space.

Claims (3)

A rotary shaft device having a rotary shaft, a bearing supporting the rotary shaft, and a lubricating oil discharge passage for discharging the lubricating oil supplied to the bearing to the outside of the machine body is discharged from the lubricating oil discharge passage. A lubricating oil comprising a recovery tank for recovering the lubricating oil, and a suction device that is interposed between the recovery tank and the lubricating oil discharge passage and sucks the lubricating oil from the bearing into the lubricating oil discharge passage A recovery device,
A relay device having a space inside is interposed between the suction device and the lubricating oil discharge passage, and the relay device and the lubricating oil discharge passage are formed as a first flow path, and the relay device and the suction device . Is connected to the second flow path, and the relay device is provided with a communication portion that communicates the internal space with the outside air,
When sucked by the suction device, outside air is taken in the relay device via the communication portion, and the lubricating oil that has reached the relay device via the first flow path passes through the second flow path together with the outside air. A lubricating oil recovery device that can be recovered to the recovery tank side .   The lubricating oil recovery apparatus according to claim 1, wherein the relay device is installed outside a processing space in which the rotating shaft device is installed.   The lubricating oil recovery device according to claim 1 or 2, wherein the relay device is provided with an opening adjustment mechanism capable of adjusting the opening of the communication portion, so that the intake amount of outside air can be adjusted.

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