JPH0354832Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a cooling device for lubricated parts such as screw bearings and nuts that drive tables of machine tools.

Conventional technology The lubricating method for bearing nuts, etc. is oil, oil, etc. as shown in Figure 2.
A pneumatic system, that is, a device that pumps a minute amount of oil using pressurized air, is often used. In addition, there are JP-A-59-227352 and JP-A-60-62438 which cool only the nut portion of a ball screw. Furthermore, there is a device that cools the bearing part, such as Japanese Patent Publication No. 17658/1983.

Problems to be solved by the invention The first problem is that the intermittent device itself is expensive;
Also, it is prohibited to mix in garbage during piping work, and sufficient care must be taken. Since the intermittent oil supply device merely supplies oil, it is difficult to suppress the temperature rise of the lubricated portion. Particularly when driving with a ball screw, temperature rises in the bearings and nuts have become a problem when rotating at high speeds. Furthermore, in the case where only the nut portion is cooled, lubrication is not taken into account.
Furthermore, the cooling of the bearing is performed in a separate system and in a separate chamber from the lubrication, which is not rational.

The present invention was devised in view of the problems of the conventional technology, and includes a cooling device with a reasonable structure that uses the oil supply pipe during the period when the oil supply is stopped, and also maintains the temperature of the lubricating part by restricting the flow rate. The purpose is to provide a constant cooling device.

Means for Solving the Problems In order to achieve the above-mentioned objects, the present invention provides an intermittent lubrication device for lubricating the bearing and nut portions of a feed screw, and a pressurized air supply connected to the lubrication pipe of the intermittent lubrication device. and a switching valve that opens the pipeline of the pressurized air supply source when refueling of the intermittent oil supply device is interrupted, and performs lubrication and cooling alternately.
Furthermore, the hydraulic pressure supplied is made higher than the air pressure, and a switching valve is used instead, or a one-way valve is interposed in the air passage together with the switching valve. Furthermore, air control means is provided to keep the temperature of the lubricating section constant.

Function: When the intermittent lubrication system is not refueling, the air pipe is opened and air is blown to the lubricated parts to cool them. If the oil supply pressure is high, the one-way valve is closed by the oil pressure during oil supply, and the valve is opened by air pressure when the oil supply is stopped to blow out air. Furthermore, the temperature of the lubricated parts is always constant due to the air control means which provide optimum cooling.

Embodiment Hereinafter, an embodiment of the present invention will be described based on FIG. A drive screw 2 whose both ends are rotatably supported on a bed (not shown) by bearings 1, 1 is rotated by a motor (not shown). A nut 3 provided under a table (not shown) placed on the bed is a drive screw 2.
They are screwed together and their movement is controlled by their rotation. Bearing 1,
1 and the lubricating part of the nut 3, oil supply pipes 4, 5,
6 are branched from the intermittent oil supply device 8 from the pipe line 7 and are connected to each other. This intermittent oil supply device 8 uses a timer or the like to turn the pump on and off at regular intervals.
This is a device that supplies oil. A pipe line 9 is connected in the middle of the pipe line 7, and is connected to a pressure air source via a one-way valve 10 and a switching valve 11 to prevent lubricating oil from escaping. The switching valve 11 is opened in synchronization with the oil supply stop period determined by the oil timer.

The oil that operates the pressurized air source and the intermittent oil supply device 8 with the switching valve 11 closed is supplied from the pipes 7 to 4,
The oil is supplied to the lubricating parts of the bearings 1, 1 and the nut 3 via 5 and 6. At the same time as the timer ends the oil supply period, the switching valve 11 is opened and the one-way valve 10 is opened, and the pressurized air is blown onto the lubricated parts of the bearings 1, 1 and the nut 3 via the pipes 9, 7 and 4, 5, 6. As the drive screw 2 rotates, heat is generated in the rolling portion, but the temperature rise of the drive screw is suppressed by cooling the drive screw by blowing air. The switching valve 11 is closed again by the operation of the timer, oil is supplied, and oil supply and cooling are repeated. Note that the one-way valve 10 can also be omitted.

When the oil supply pressure of the intermittent oil supply device 8 is made higher than the cooling air pressure, the cooling air is left open and the one-way valve 10 is automatically closed at the time of refueling to prevent oil from escaping during refueling. When refueling is finished, the one-way valve 10 is opened using cooling air pressure to blow out pressurized air for cooling. In this case, the switching valve 11 can be omitted.

In addition, a comparison circuit compares the temperature detected by installing a temperature sensor in the lubricating part with a predetermined set temperature, and if the temperature of the lubricating part exceeds the set temperature, the solenoid valve for cooling air opens. The actuator causes the throttle valve in the middle of the circuit to approach full opening, sending a large amount of air to the lubricating section. In addition, if the temperature of the lubricating part is lower than the set temperature, the cooling of the lubricating part is eased by reducing the amount of air by closing the solenoid valve or throttling the throttle valve close to fully closed. It is possible to keep the temperature constant due to the amount of heat generated.

Effects Since the present invention is configured as described above, the cooling device of claim 1 can omit special piping work and conduits to the cooling section, allowing efficient cooling at low cost. .

In addition to the effects of the first aspect, the cooling device according to the second aspect does not require synchronizing the operating oil supply time of the switching valve, and the valve itself can be omitted, making the system even simpler.

In the cooling device of claim 3, in addition to the effects of claims 1 and 2, the temperature of the lubricating part is always kept constant during operation by air control means that opens and closes the supply of cooling air or limits the flow rate based on the signal from the temperature sensor. It is possible to keep it.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a cooling device of the present invention, and FIG. 2 is an explanatory diagram of a conventional cooling device. 1...Bearing, 2...Drive screw, 3...Nut,
4, 5, 6, 7, 9...Pipe line, 8...Intermittent oil supply device, 10...One-way valve, 11...Switching valve.

Claims (1)

[Claims for Utility Model Registration] (1) An intermittent lubrication device for lubricating the bearing and nut portions of a feed screw, a compressed air supply source connected to a lubrication pipe of the intermittent lubrication device, and A cooling device for a drive screw lubricating section, characterized in that it includes a switching valve that opens the pipeline of the pressurized air supply source when refueling is interrupted, and performs lubrication and cooling alternately. (2) The drive according to claim 1, wherein the supply oil pressure of the intermittent oil supply device is higher than the air pressure of the air supply source, and a one-way valve that is closed by the supply oil pressure is provided in place of the switching valve or together with the switching valve. Cooling device for screw lubrication section. (3) The machine according to claim 1 or 2, further comprising an air control means for controlling the air supply source on and off according to the operating state of the machine to perform optimal cooling according to the amount of heat generated. Cooling device for drive screw lubrication section.