JPH02229995A - Lubricating fluid feed device - Google Patents

Abstract

PURPOSE:To prevent the occurrence of an obstacle due to the excessive feed of lubricating fluid and deficiency in circulating fluid by a method wherein when it is detected that a precision machine is in an inoperative state during non-energization, in prior to the starting thereof, the lubricating fluid in an amount conforming to that during non-energization is fed to the precision machine. CONSTITUTION:Resulting from disconnection of a power source, a signal from a non- energization deciding circuit 176 is introduced to a non-energization time set timer 178 to start measurement of a non-energization time. After elapse of a specified time, an abnormal motion deciding circuit 154 interlocks the precision machine through a terminal 112. With the power source turned ON again, by means of a signal from a source turn-on start circuit 172, a feed time set timer 174 is set according to a time set by the non-energization time set timer, and the opening and closing motion of a solenoid switching valve is effected N times per one second. By means of an N-th signal, the abnormal motion deciding circuit 154 releases the precision machine from interlocking, and a switching valve feeds oil intermittently N times. This constitution supplies air oil to the precision machine, and thereafter brings the precision machine into a normal operating state.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a lubricating fluid supply device configured to intermittently supply a predetermined amount of lubricating fluid to a machine tool, etc. Specifically, a lubricating fluid supply device is provided with a switching valve for driving an oil pump and a timer circuit, and the machine tool, etc. is started after a preset de-energization time of the lubricating fluid supply device, which is set in advance by the timer circuit. In this case, a lubricating fluid supply device that immediately supplies lubricating fluid to the machine tool by continuously opening and closing the electromagnetic switching valve for driving the oil pump a predetermined number of times, and as a result, the machine tool can be brought into normal operation almost immediately. Regarding.

Spindles installed in cutting machines such as machining centers and NC lathes have relatively large shaft diameters, and
It is generally driven at low speed rotation. Therefore, grease is mainly used as a lubricating medium.

[Problems to be Solved by the Invention] However, in recent years, even in the field of use of machine tools such as NC lathes, there has been a demand for higher speed equipment in order to improve work efficiency. However, the conventional grease lubrication system cannot meet this demand because it cannot tolerate the deterioration of rotational accuracy due to deterioration of the lubricating grease during high-speed rotation.

In order to solve this problem, it is possible to use a micro-mist lubrication method that has a proven track record in grinding machines, etc., but this method raises issues of safety when supplying micro-mist and deterioration of the working environment due to exhaust mist. It has not yet been adopted.

Therefore, an air-oil lubrication system was developed to improve this problem.This system is extremely suitable for high-speed rotation due to the low viscosity of air-oil, but once work is stopped, the air-oil lubrication system is Due to its viscosity, the lubricating air oil disappears from the machine tool in a short period of time, making it easy to run out of oil. Therefore, if the machine tool is restarted in this state, there is a risk that the machine tool may be burnt out due to frictional resistance or the like before oil is supplied to the spindle or the like constituting the machine tool.

The present invention has been made in order to overcome the above-mentioned disadvantages, and includes an oil pump drive switching valve and a timer circuit disposed in the air oil supply device as a lubricating fluid. When a machine tool, etc. is operated after a set energization time, an amount of lubricating fluid corresponding to a length corresponding to the non-energization time is immediately supplied, and as a result, the machine tool is operated in a normal state almost immediately. The object of the present invention is to provide a lubricating fluid supply device that makes it possible.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a lubricating fluid supply device that introduces and draws out lubricating fluid to and from a machine tool by opening and closing operations of a switching valve. A non-energizing time setting timer for measuring a predetermined non-operating time is attached to the lubricating fluid supply device, and the non-energizing time setting timer measures the non-operating time of the machine tool, etc., so that the machine tool etc. When a non-operating state is detected, the machine tool is configured to supply lubricating fluid in an amount corresponding to the non-energizing time to the machine tool prior to starting the machine tool in response to a signal from the non-energizing time setting timer. It is characterized by

[Function] The present invention provides that, when power is stopped to a machine tool and the machine tool is restarted with power, a predetermined amount of lubricating fluid is supplied for a predetermined period of time corresponding to the de-energization time before the machine tool is operated. By supplying lubricating fluid to the machine tool, it is possible to prevent troubles caused by an oversupply of lubricating fluid and a shortage of circulating fluid, and to quickly start up the machine tool.

[Embodiments] Next, preferred embodiments of the lubricating fluid supply device according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a pneumatic/electrical circuit diagram of a lubricating fluid supply device according to the present invention, in which reference numeral 10a indicates an oil pump. The oil bomb 10a has piston portions 22a, 26a and a piston rod 20 that are in sliding contact with the cylinder lla.
Contains a. A spring 28 is attached to the piston rod 20a.
a is locked, one end of the spring 28a is seated on the cylinder lla, and the other end is pressed against the piston portion 26a. cylinder l
A chamber 16a and a chamber 30a are defined in la, and chamber 16a and chamber 30a are defined within la.
Oil is introduced from the oil tank 40 through the check valve 12a to the oil inlet 14a. A spring-loaded check valve 32a is interposed on the oil outlet 15a side of the chamber 16a. In this case, the internal pressure of the chamber 16a is detected by a pressure switch 18a, and the output signal of the pressure switch 18a is introduced into the electric circuit control section 100.

On the other hand, the other end of the oil outlet spring-equipped check valve 32a is connected to a variable orifice 34 constituting a mixing valve 33.
communicates with a transparent tube 36a via a, and the tube 36a
The other end communicates with a machine tool 38a whose details are not shown. An air introduction outlet 25a is provided for the chamber 30a in the cylinder 11a, and the air introduction outlet 25a communicates with a port 58b of the electromagnetic switching valve 58. In addition,
In this case, the other oil pumps 10b to 10e are constructed in the same manner as the oil pump 10a, and detailed explanation thereof will be omitted by adding b to e to the same reference numerals.

The variable orifice 34a includes a pressure gauge 52 and an electromagnetic switching valve 5.
It communicates with a compression pump 56 (not shown) via a pressure switch 58a and a pressure switch 54.

A pressure detection terminal 54a of the pressure switch 54 faces a conduit connected to the compression pump 56.

On the other hand, a float switch 4 is provided in the oil tank 40.
2 is arranged, and the output terminal of the float switch 42 is connected to the terminals 104a and 104a in the electric circuit control section 100.
4b. Control terminal 58 of the electromagnetic switching valve 58
c are terminals 106a and 106b of the electric circuit control section 100
Further, the pressure gas and the operation setting terminals 54b and 54C of the switch 54 are connected to the electric circuit control section 100, respectively.
It is connected to the terminals 102&, 102b. A down time setting timer setting knob 124 in the electric circuit control section 100 is used to determine the down time when air oil is intermittently supplied to the machine tool.

Next, in FIG. 2, reference numeral 110a. 110b
is an AC power supply terminal, and the output of the AC power supply terminal is connected to the DC stabilized power supply 170. The first output terminal of the stabilized power supply 170 is connected to the non-energization determination circuit 1760.
Introduced to human power terminal. Also, the second of the stabilized power supply 170
The output terminal of the AC
It is connected via a power-on start circuit 172 to a first input terminal α of a supply time setting timer 1 to 4 that determines the oil supply time of the oil pumps 10a to 10e.

Although not shown, the DC power of the stabilized power supply 170 is also supplied to each of the other blocks.

The output signal of the de-energization determination circuit 176 is input to the first input terminal of the de-energization time setting timer 178, which sets the de-energization time to 5 hours, for example.

A battery 179 is connected to the second input terminal of the de-energized time setting timer 178, and the battery 179 operates the de-energized time setting timer 178 only when de-energized. Note that the other end of the battery 179 is grounded. An output signal from a reference oscillator 186 that oscillates based on the crystal oscillator 118 is introduced into the clock input terminal of the non-energization time setting timer 178 . In addition, the de-energization time setting timer 17
The output terminal of 8 is connected to the second input terminal α2 of the supply time setting timer 174, and the abnormal operation determination circuit 1
It is connected to one input terminal of 54. The output signals of the pressure switches 18a to 18e are connected to the other input terminals of the abnormal operation determination circuit 154 through amplifiers 150a to 150e, respectively.
and is inputted through the operation determination circuits 152a to 152e. Note that the operation determination circuits 152a to 152e
are connected to LEDs 122a to 122e that are turned on only when the pressure switches 18a to 18e are operated. The output terminal of the abnormal operation determination circuit 154 is connected to one input terminal of an external interlock contact control circuit 156. The pressure detection signal from the pressure switch 54 is connected to the other input terminal of the external interlock contact control circuit 156 via one output terminal of the pressure rise determination circuit 158. Note that an LED that lights up when the pressure increases is connected to the other output terminal of the pressure increase determination circuit 158. and the external interlock contact control circuit 156
The output terminal of is connected to the external interlock connection terminal 112. The external interlock connection terminal 112 is connected to interlock terminals of the machine tools 38a to 38e.

One output terminal of the supply time setting timer 174 is connected to an input terminal of a pause time setting timer 180. The other output terminal of the supply time setting timer 174 is connected to the electromagnetic switching drive terminal 106 via the electromagnetic switching valve drive circuit 184. The output signal of the pause time setting timer 180 is passed through the setting time determination circuit 182 to the third output signal of the supply time setting timer 174.
is connected to input terminal α3 of. Note that a reference oscillation signal is introduced from a reference oscillator 186 to the clock input terminals of the supply time setting timer 174 and the rest time setting timer 180, similarly to the de-energization time setting timer 178.

On the other hand, the output signal of the float switch 42 is transmitted to the terminal 10.
4 and is introduced into the oil level abnormally low contact circuit 162 through the interface 160. Abnormally low oil level contact circuit 16
The output signal No. 2 is connected to the low oil level contact 114 and also to the LED 120 that lights up when the oil level is low.

The lubricating fluid supply device according to the present invention is basically constructed as described above.Next, its operation and effects will be explained with reference to the time chart shown in FIG. 3.

First, AC power is supplied through the AC power supply terminals 110a and 110b after a de-energization time that is shorter than a predetermined time (5 hours in this embodiment) determined by the de-energization time setting timer 178. Stabilized power supply 170 operates and AC1t
When a DC 12V voltage is applied to the power-on start circuit 172, the AC power-on start circuit 172 sends a supply time setting timer start signal to the supply time setting timer 174. At this time, the supply time setting timer 174 is set for about 1 second (section t in FIG. 3) in this embodiment, and the solenoid switching valve drive circuit 18
4 to switch the electromagnetic switching valve 58 to the conducting side via the electromagnetic switching valve drive terminal 106.

When the electromagnetic switching valve 58 is switched to the conducting side, compressed air is introduced into the chamber 30a of the oil pump 10a, and the piston rod 20a moves within the cylinder lla in the eight directions of arrows in FIG. 1 to narrow the chamber 16a. .

At this time, the oil stored in the chamber 16a is led out to the pipe body 36a through the spring-loaded check valve 32a. on the other hand,
Compressed air from the pressure pump 56 passes through the variable orifice 34a.
The oil and compressed air are introduced into the pipe body 36a through the mixing valve section 33, and the oil and compressed air are mixed to form an air-oil mixed fluid and introduced into the machine tool 38a. After the electromagnetic switching valve 58 operates for about 1 second, at time T1 shown in FIG. Pre-speech pause time setting timer 18
The set time set to 0 is determined by the set time determination circuit 182, and the determination signal is manually inputted to the pause time setting terminal α3 of the supply time setting timer 174. Thereafter, during the pause time t2 (6 seconds in the embodiment) shown in FIG. As a result, the piston moves in the direction B in the figure due to the repulsive force of the spring 28H attached to the piston rod 20a, and as a result, oil is introduced from the oil tank 40 into the chamber 16a and stored therein.

After time T2, the above-mentioned actions related to times t1 and t2 are repeated. In addition, during the above-mentioned 1 hour, the piston rod 20a
When the oil pump moves in eight directions in the figure, the internal pressure in the chamber 16a increases, and at that time, the pressure switch 18a is activated and the oil pump operation LED 122a is turned on via the amplifier 150a and the operation determination circuit 152a. In this case, since the pressure is normal, the abnormal operation determination circuit 154 does not operate. In addition, FIG. 3b1 and FIG. 3C show the operating state of the pressure switch 18a and the pump operating L E Ds 122a to 1.
The operating state of 22e is shown by hatching.

Next, a detailed description of circuits related to interlocking of abnormal operations such as the oil level low float switch 42, abnormal operation determination circuit 154, pressure switch 54, etc. is not the gist of the present invention, but Oil level drop float switch 42 that detects oil level drop, oil pump 10a
The abnormal operation determination circuit 154 operates when the pressure in the inner chamber 16a increases abnormally, and the pressure switch 54 operates when the pressure of compressed air introduced from the compression pump to the oil pump 10a increases above a predetermined level. do.

Next, a description will be given of the characteristic operation according to the present invention during a predetermined non-energizing time (5 hours in the example) after the power is turned off.

Now, when the AC power is cut off, the output signal of the stabilized power supply 170 becomes 0 volts, and at that time, the de-energization determination circuit 176
introduces the de-energization determination signal to the de-energization time setting timer 178. At this time, the non-energizing time setting timer 178 is backed up by the battery 179 and starts counting, and starts measuring the non-energizing time. De-energized time setting timer 1
Reference numeral 78 indicates that an interlock signal from the de-energization time setting timer 178 is activated abnormally when, for example, 5 hours (time related to d1t in FIG. 3) have elapsed since the de-energization start signal from the de-energization determination circuit 176 arrived. The abnormal operation determination circuit 154 is connected to the external interlock connection terminal 1 via the external interlock contact control circuit 156.
An interlock signal is sent to an interlock manual terminal (not shown) of the machine tool 38a through 12, and as a result,
Machine tool operations are interlocked.

Also, at this time, a continuous opening/closing drive signal is introduced from the de-energization time setting timer 178 to the terminal α2 of the supply time setting timer 174.

When the AC power is turned on again in this state, the stabilized power supply 170 operates, the de-energization determination circuit 176 operates, the de-energization time setting timer 178 is reset, and the AC power-on start circuit 172 operates. A timer start signal is input from the timer start terminal α1 of the supply time setting timer 174 to the timer start terminal α1. The supply time setting timer 174 is set according to the time of the de-energization time setting timer. In this case, as shown in FIG. 3d, N
The electromagnetic switching valve 58 is opened and closed twice.

As for the number of times of operation, when 5 hours have elapsed as in the present example, it is preferable to operate several tens of times. Note that when the N-th drive signal is applied to the control terminal 58C of the electromagnetic switching valve 58, an interlock release preliminary signal is input from the de-energization time setting timer 178 to the abnormal operation determination circuit 154.
The interlock release signal from the abnormal operation determination circuit 154 releases the interlock of the machine tool 38a through the external interlock contact control circuit 156 and the external interlock connection terminal 112.

Therefore, as shown in FIG. 3d, the electromagnetic switching valve 58 is
By performing the operation of supplying oil intermittently, the machine tool 38a continues to be inactive for a long period of time, and as a result, the machine tool 38a, which has been in a state where it is out of oil, is instantly replenished with air oil. . After this, the machine tool will work normally.

In this case, the waveform shown in FIG.
a to 18e and bomb operation LED 122aS12
2e operation is shown. Note that the description of the functions related to the other oil bombs 10b to 10e is based on the above-mentioned oil bomb 10a.
The detailed explanation will be omitted since it performs the same function as that related to .

As described above, according to the present invention, by disposing the oil pump drive electromagnetic switching valve and a plurality of timer circuits in the lubricating fluid supply device, when the device is operated after a preset de-energization time, the lubricating fluid supply device can be operated immediately after the operation. By continuously opening and closing the electromagnetic switching valve for driving the oil pump a predetermined number of times corresponding to the non-energized time of the device via the plurality of timer circuits, the amount corresponding to the length of the non-energized time is of lubricating fluid can be immediately supplied to the machine tool. Therefore, it is possible to operate the machine tool almost immediately. That is, since air oil is always supplied when the machine tool is restarted, there is no risk of an accident such as burnout of the spindle due to friction or the like.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments, and various improvements and changes in design are possible without departing from the gist of the present invention. Of course.

[Brief explanation of the drawing]

FIG. 1 is a pneumatic/electrical circuit diagram according to the present invention, FIG. 2 is a detailed circuit block diagram of an electrical control section according to the present invention, and FIG. 3 is a pneumatic/electrical circuit diagram of the pneumatic/electrical circuit shown in FIGS. 1 and 2. 5 is a timing chart showing the operation of main parts. 10a...Oil pump 38a...Machine tool 4
0... Oil tank 42... Float switch 52... Pressure gauge 54... Pressure switch 5... Solenoid switching valve 100... Electric circuit control section 156... External interlock contact control circuit 17
4... Supply time setting timer 176... De-energization determination circuit 178... De-energization time setting timer 180... Rest time setting timer 186... Reference oscillator FIG. 3

Claims (1)

[Claims] (1) In a lubricating fluid supply device that introduces and draws out lubricating fluid to a machine tool by opening and closing a switching valve, a de-energization time setting timer that measures a predetermined non-operating time when the machine tool is de-energized is connected to the lubricating fluid. Attached to the supply device, the non-operating time of the machine tool, etc. is measured by the non-energizing time setting timer, and when it is detected that the machine tool is in the non-operating state when the machine tool is de-energized, the non-energizing time setting timer 1. A lubricating fluid supply device characterized in that the lubricating fluid supply device is configured to supply lubricating fluid in an amount corresponding to a non-energized time to a machine tool prior to starting the machine tool in response to a signal from the machine tool.