JP2002018676A - Machine tool main shaft bearing lubrication waste oil discharge device - Google Patents

Abstract

[PROBLEMS] To provide a device for inexpensively discharging waste lubricating oil supplied to a bearing of a main shaft of a machine tool to a predetermined position. An oil pan (4) is attached to an end of a bearing sleeve (2) of a main shaft (3) of a machine tool, and one end of a flexible pipe (9) as a discharge pipe is inserted into the oil pan (4). The other end of the large-diameter pipe 6 as a pipe is connected to a waste oil discharge position. The air pipe 8 is inserted into the large-diameter pipe 6 with a gap between the large-diameter pipe 6 and the inner periphery of the large-diameter pipe 6.
The water flow pump 11 is formed by keeping the end 8b of the large diameter pipe 6 inside the large diameter pipe 6. Then, by supplying high-speed air to the air pipe 8 and discharging it in the large-diameter pipe 6, a negative pressure is generated by the principle of the water flow pump 11 to suck and discharge the waste oil in the oil pan 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for discharging used lubricating waste oil when lubricating oil is supplied to a bearing supporting a main shaft of a machine tool.

[0002]

2. Description of the Related Art A conventional example (A) for discharging lubricating waste oil supplied to a bearing of a main shaft of a machine tool is shown in FIG.
No. 4,284,104 is known. This actual opening 64
In No.-42841, the lubricating oil supplied to the bearing 102 of the main shaft 101 is supplied to the discharge port 10 provided below the bearing 102.
3 and is forcibly discharged by being sucked by a pump. At this time, the lubricating waste oil that has flowed down without being completely discharged is collected in the oil pocket 104, is sucked by the pump from the discharge port 105, and is forcibly discharged.

A conventional example (B) is known from Japanese Utility Model Laid-Open No. 1-175147 shown in FIG. In Japanese Utility Model Laid-Open Publication No. 1-175147, when oil and air supplied to the bearing 112 of the main shaft 111 for cooling are sucked by the pump 113, when the pump 113 fails or when the pipe is clogged, the bearing 112 and the pump are connected. The inlet pressure of a safety valve 114 provided between the safety valve 114 and the safety valve 114 becomes high.
Operates to release oil and air to the outside. FIG. 6 using oil air as a lubricant is known as a conventional example (C). In this, a joint 122 is attached to the lower end of the spindle head 121 to discharge used oil air out of the machine. Further, as a conventional example (D), a gutter is provided from a tip end of a main shaft for discharging lubricating waste oil, and the gutter is pulled to a position separated from a workpiece and discharged.

[0004]

In the prior arts (A) and (B) described in the prior art, a suction pump is installed to forcibly discharge the lubricating waste oil, so that it becomes expensive. Had a problem. Further, the conventional example (C) has a problem that the lubricating waste oil discharged from the joint drops on the workpiece and is not preferable. Further, the conventional example (D) has a problem that the gutter can be installed only in the flow direction of the lubricating waste oil, the work and the gutter may interfere with each other, and the machining is restricted. SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems of the related art, and has as its object to provide a device for inexpensively discharging waste lubricating oil supplied to a bearing of a main shaft of a machine tool to a predetermined position. It is intended to provide.

[0005]

In order to achieve the above object, an apparatus according to the present invention is provided with a used bearing supplied to a bearing at an end of a bearing sleeve or a bearing housing of a main shaft of a machine tool. An oil pan receiving lubricating waste oil is attached, a discharge pipe is inserted into the oil pan, one end of which is inserted and the other end is piped to a waste oil discharge position, an air pipe through which air flows is provided, and an end of the air pipe and a discharge pipe are provided. And the ends of the oil pipes are connected in the same direction of the flow of the air and the waste oil. By supplying high-speed air to the air pipe, a negative pressure is generated on the discharge pipe side, and the waste oil in the oil pan is sucked. To discharge.

According to the first aspect of the present invention, since the discharge pipe and the air pipe are connected in the same flow direction, the lubricating waste oil can be discharged using high-speed air by utilizing the viscosity of the fluid by the principle of a water flow pump. It is possible to discharge waste oil to a desired position freely and inexpensively.

According to a second aspect of the present invention, the connection is such that the other end of the connection is inserted into the air pipe or the discharge pipe with a gap between the inside of the discharge pipe and the inside thereof. It is. According to the device of the second aspect, the air in the discharge pipe that is in contact with the laminar air discharged from the air pipe also flows as a laminar flow, so that the waste oil can be discharged smoothly.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings, taking an example in which oil-air lubrication is performed on a vertical machining center. FIG. 1 is a schematic explanatory view showing an overall view of a lubricating waste oil discharging device, and FIG. 2 is an enlarged explanatory view of a piping portion. A spindle sleeve 2 is provided on a spindle head 1 of the vertical machining center. A spindle 3 supported by a bearing (not shown) is mounted in the spindle sleeve 2 so as to be rotatable and indexable.

An appropriate number of discharge ports 2a for lubricating waste oil are provided on the outer periphery of the cylindrical lower end portion of the main spindle sleeve 2, and a plurality of holes 4 communicating with each of the plurality of discharge ports 2a.
a, and an oil pan 4 having a frame-shaped cross section connecting these discharge ports 2 a is attached to a lower end portion of the spindle sleeve 2. Then, the used oil air is discharged into the oil pan 4 from the discharge port 2a. The oil pan 4 has a number of small-diameter holes 4b formed in the upper surface of the cross-sectional frame. The air of the oil air is spontaneously discharged into the atmosphere from the small-diameter holes 4b, and only the oil is stored in the oil pan 4. .

A T-shaped joint 5 as a joint for connecting a pipe is attached to the spindle head 1. One end of a large-diameter pipe 6 is connected to a discharge port 5a on the side of the T-shaped joint 5 as a discharge pipe. I have. The large-diameter pipe 6 is bent along the spindle head 1 so as not to interfere with a workpiece (not shown) or other devices (not shown), and is led into a chip conveyor (not shown). An air solenoid valve 7 is attached to the spindle head 1, and high-pressure air is sent to the air solenoid valve 7 from an air source (not shown). The air solenoid valve 7 can be freely provided other than the spindle head 1.

In the machining center, immediately before and after the tool T is attached to and detached from the tip of the main spindle 3, air is blown against the shank portion of the normal tool T to blow off foreign substances to perform cleaning. Therefore, the air source is always secured and there is no need to install a new air source. The supplied high-pressure air is throttled by an air passage in the air solenoid valve 7, and the pressure energy of the high-pressure air is converted into velocity energy by a nozzle effect, and becomes high-speed air to flow out of the outlet 7 a of the air solenoid valve 7. One end 8a of the air pipe 8 is connected to the outlet 7a. The air pipe 8 has an intermediate portion fixed at the inlet 5b on the side of the T-shaped joint 5, and the other end 8b passes through the inside of the T-shaped joint 5 to form a large-diameter pipe 6.
And reaches a predetermined position with a gap between it and the inner circumference thereof.

Therefore, the portion from the position of the discharge port 5a of the T-shaped joint 5 to the position of the other end 8b of the air pipe 8 has a double pipe structure of the air pipe 8 and the large diameter pipe 6, so that a so-called water flow pump 11 is formed. You. Right angle side 5c of T-shaped joint 5
Is connected to one end of a flexible pipe 9 as a discharge pipe, and the other end is inserted into the oil pan 4 to take in foreign matter into the flexible pipe 9 so as not to block the gap of the double pipe structure. Is attached to the oil pan 4 with a pipe stop 10 with a slight gap δ from the bottom surface of the oil pan 4.

[Operation] When a workpiece is machined by a machining center, an oil-air lubrication device (not shown) is operated, and the bearing of the main shaft 3 is lubricated by oil-air. Then, the used oil air is discharged from the discharge port 2a into the oil pan 4. The discharged air is oil pan 4
Is released into the atmosphere through the small-diameter hole 4b, and only the used lubricating waste oil remains in the oil pan 4. The air solenoid valve 7 is actuated every fixed time during which a predetermined amount of lubricating waste oil is accumulated in the oil pan 4 or every time a suitable number of workpieces are processed.

The high-pressure air sent from an air source (not shown) is converted into high-speed air by a nozzle effect in a passage in the air solenoid valve 7, and at high speed becomes a laminar flow in the air pipe 8, and flows through the large-diameter pipe 6. Will be released. The flow velocity of the air near the end 8b of the air pipe 8 in the large-diameter pipe 6 will be described with reference to a velocity distribution diagram shown in FIG. The air flows in the air pipe 8 in a laminar flow and the center portion flows at the highest speed Vo. The speed of the air in contact with the wall surface in the air pipe 8 is low due to friction with the wall surface, and the speed v
It becomes 1 and a speed gradient occurs as shown in FIG.

In this state, with respect to the flow of the air discharged from the end 8b of the air pipe 8, the air in the portion of the large diameter pipe 6 which is in contact with the air from the air pipe 8 is pulled by the viscosity of the fluid. As a result, the air flows at a speed v2 slightly lower than the speed of the air from the air pipe 8. However, the air near the wall surface of the large-diameter pipe 6 has a slow flow velocity v3 and a very large velocity gradient.

In this way, the air in the large diameter pipe 6 also flows in the same direction by multiplying the flow of the air in the air pipe 8 as a whole. The space in 5 and the space in flexible pipe 9 are closed spaces into which air does not flow from the other.

Accordingly, as the air in the large diameter pipe 6 flows, the closed space becomes negative pressure, and the lubricating waste oil remaining in the oil pan 4 is sucked into the flexible pipe 9. The air is discharged into the large-diameter pipe 6 while being mixed with the air in the T-shaped joint 5 and the flexible pipe 9, and is sent to a conveyor (not shown) by the air discharged from the air pipe 8. Thereafter, when all the air in the T-shaped joint 5 and the flexible pipe 9 is discharged, only the lubricating waste oil is discharged through the large-diameter pipe 6 together with the high-speed air of the air pipe 8. As described above, this apparatus uses the so-called water flow pump 11, and discharges waste oil according to the principle.

In the above description, the oil tank is attached to the lower part of the spindle sleeve. However, the oil tank may be attached to the bearing housing instead of the spindle sleeve. In the above description, the case where oil air is supplied to the bearing of the main shaft of the machine tool has been described. However, the present invention is not limited to oil air, and it is needless to say that the present invention is also applicable to the case where lubricating oil is simply supplied. Further, in the present invention, the vertical machining center has been described as an example, but it is needless to say that the present invention can be applied to other machine tools.

[0019]

Since the apparatus according to the present invention is constructed as described above, the following effects can be obtained. Since the discharge pipe and the air pipe have the same flow direction and are connected to each other, the lubricating waste oil can be discharged at high speed by utilizing the viscosity of the fluid by high-speed air. In addition, the waste oil can be freely discharged to a desired position.

In the apparatus according to the second aspect, the air in the discharge pipe in contact with the laminar air discharged from the air pipe also flows as a laminar flow, so that the waste oil can be discharged smoothly.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing an entire lubricating waste oil discharging device of the present invention.

FIG. 2 is an enlarged explanatory view of a pipe portion of FIG. 1;

FIG. 3 is a velocity distribution diagram of an air flow in the vicinity of a double pipe section according to the present invention.

FIG. 4 is an explanatory diagram of a conventional example (A).

FIG. 5 is an explanatory diagram of a conventional example (B).

FIG. 6 is an explanatory diagram of a conventional example (C).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main shaft head 2 Bearing sleeve 3 Main shaft 4 Oil pan 5 T-joint 5a T-joint outlet 6 Large diameter pipe 7 Air solenoid valve 7a Outlet of air solenoid valve 8 Air pipe 9 Flexible pipe 11 Water flow pump

Claims (2)

[Claims] An oil pan for receiving used lubricating waste oil supplied to a bearing is attached to a bearing sleeve of a main shaft of a machine tool or an end of a bearing housing, one end is inserted into the oil pan, and the other end is inserted. A discharge pipe is provided to the waste oil discharge position, an air pipe through which air flows is provided, and the end of the air pipe and the end of the discharge pipe are connected in the same direction of air and waste oil flow. A drainage device for lubricating bearing lubrication of a main shaft of a machine tool, wherein a negative pressure is generated on the discharge pipe side by supplying air to suck and discharge the waste oil in an oil pan. 2. The connection according to claim 1, wherein the other end of the air pipe or the discharge pipe is inserted into the discharge pipe with a gap between the air pipe and the discharge pipe.
A bearing lubrication waste oil discharging device for a spindle of a machine tool as described in the above.