JPS63120997A - Lubricating fluid supplying device - Google Patents

Abstract

PURPOSE:To make it possible to normally operate a machine tool substantially on the instant by disposing a driving solenoid switching valve for an oil pump and plural timer circuits on a lubricating fluid supplying device. CONSTITUTION:The introduction of a lubricating fluid to/from a machine tool 38a and the like is performed by the opening/closing action of a switching valve 58. In addition, there are provided timers 174, 178, 180 in the machine tool 38a and the like for measuring the predetermined non-operating time. When it is detected that the non-operating state of the machine tool 38a and the like is kept in excess of a predetermined period, the switching valve 58 is opened by the signal prior to the starting of the machine tool 38a and the like so that a lubricating fluid is supplied to the machine tool 38a and the like. With this constitution, the machine tool can be normally operated substantially on the instant.

Description

DETAILED DESCRIPTION OF THE INVENTION 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. When the supply device is provided with a switching valve for driving the oil pump and a timer circuit, and the machine tool etc. is started after the non-energization setting time of the lubricating fluid supply device, which is set in advance by the timer circuit, the oil pump is not driven. The present invention relates to a lubricating fluid supply device that immediately supplies lubricating fluid to the machine tool by continuously opening and closing an electromagnetic switching valve a predetermined number of times, thereby enabling the machine tool to perform normal operation almost immediately.

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.

However, in recent years, even in fields where machine tools such as NC lathes are used, 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 the work is stopped, the air-oil lubrication system Due to its low viscosity, the lubricating air oil from the machine tool disappears 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 or the like is operated after a set energization time, the timer circuit automatically and continuously opens and closes the oil pump drive switching valve a predetermined number of times at high speed, thereby immediately supplying lubricating fluid to the machine tool. An object of the present invention is to provide a lubricating fluid supply device that enables the machine tool to operate in a normal state almost immediately.

In order to achieve the above object, the present invention provides a lubricating fluid supply device that introduces and draws out lubricating fluid to a machine tool by opening and closing a switching valve, and a timer that measures a predetermined non-operating time of the machine tool. Attached to the lubricating fluid supply device, the timer measures the non-operating time of the machine tool, etc., and when it is detected that the machine tool is in a non-operating state for a predetermined set time or more, the signal causes the machine tool to be activated. The present invention is characterized in that the switching valve is opened prior to startup to supply lubricating fluid to the machine tool.

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 pump 10a has piston portions 22a and 26a that are in sliding contact with the cylinder lla, and a piston loft 20.
Contains a. Spring 2 on the piston rond 20a
8a 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. A chamber 16a and a chamber 30a are defined within the cylinder 11a, and the chamber 1
Oil is introduced from the oil tank 40 into the oil inlet 14a of the oil tank 6a via the check valve 12a. Room 16a
A spring-equipped check valve 32a is interposed on the oil outlet 15a side. 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 the mixing pulp 33.
communicates with the 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 the boat 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 is a pressure gauge 52) an electromagnetic switching valve 5
It communicates with a compression pump 56 (not shown) via a boat 58a of No. 8 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 provided, and the output terminal of the float switch 42 is connected to the terminals 104a and 1 in the electric circuit control section 100.
Connected to 04b. Control terminal 5 of the electromagnetic switching valve 58
8c are terminals 106a and 106b of the electric circuit control section 100
Further, operation setting terminals 54b and 54c of the pressure switch 54 are connected to terminals 102a and 102b of the electric circuit control section 100, respectively. 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 numerals 110a and 110b are AC power input terminals, and the outputs of the AC power input terminals are connected to a DC stabilized power supply 170. A first output terminal of the stabilized power supply 170 is introduced into an input terminal of a non-energization determination circuit 176. Further, the second output terminal of the stabilized power supply 170 is connected to the oil pump 1 via an AC power supply start circuit 172 that detects that the AC power supply is supplied.
It is connected to the first input terminal α1 of a supply time setting timer 174 that determines the oil supply times of 0a 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 79 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 the battery 179 is de-energized.

Note that the other end of the batch 79 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 . Further, the output terminal of the de-energization time setting timer 178 is connected to the second input terminal α2 of the supply time setting timer 174, and the abnormal operation determination circuit 154
is connected to one input terminal of the Abnormal operation determination circuit 15
The pressure switches 18a to 1 are connected to the other input terminal of 4.
The output signals of 8e are inputted through amplifiers 150a to 150e and operation determination circuits 152a to 152e, respectively. Incidentally, LEDs 122a to 122e, which are turned on only when the pressure switches 18a to 18e are operated, are connected to the operation determination circuits 152a to 152e.

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.

The output terminal of the external interlock contact control circuit 156 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 3i3e.

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 the reference oscillation signal power j is introduced from the 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 oil level low contact 114 and also to the LED I 20 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, and its operation and effects will now be explained with reference to the flowchart in FIG. 3.

First, AC power is supplied through the AC power input 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. When the stabilized power supply 170 operates and a voltage of 12V DC is applied to the AC power supply start circuit 172, the A
C power-on start circuit 172 sends a supply time setting timer start signal to supply time setting timer 174 . At this time, the supply time setting timer 174 drives the electromagnetic switching valve drive circuit 184 for approximately 1 second (section t1 in FIG. 3) in this embodiment, and conducts the electromagnetic switching valve 58 via the electromagnetic switching valve drive terminal 106. Switch to the side.

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 inside the cylinder lla in the direction of arrow A in FIG.
direction to narrow the chamber 16a.

At this time, the oil stored in the chamber 16a is discharged into the pipe body 36a through the spring-loaded check valve 32a. on the other hand,
The compressed air from the pressure bomb 56 is passed through the variable orifice 34a.
The oil and compressed air are mixed in the mixing pulp section 33 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, the time T shown in FIG. 3a occurs.

At , the pause time setting timer drive signal is introduced from the supply time setting timer 174 to the input terminal of the pause time setting timer 180 , and at this time, the setting time set by the pause time setting timer 180 is determined by the setting time determination circuit 182 . ,
The determination signal is input to the pause time setting terminal α of the supply time setting timer 174. Thereafter, during the pause time tz (6 seconds in the embodiment) shown in FIG.
The air in the spring 2 that is attached to the piston rod 20a is drawn out from the air introduction outlet 25a.
The repulsive force of 8a moves the piston in the direction B in the figure, and as a result, oil is introduced from the oil tank 40 into the chamber 16a and stored therein.

After time T2, 1. ．． 1. Repeat the above action regarding time. In addition, the piston rod 20a was removed during the 1 hour period.
When the oil pump moves in the direction A 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, the pressure switch 18a is shown in FIG. 3b and FIG. 3C.
The operating states of the pump operating LEDs 122a to 122e are shown by hunting portions.

Next, a detailed description of the circuits related to the interlock of abnormal operation of the oil level lowering float switch 42) abnormal operation determination circuit 154, pressure switch 54, etc. will not be described in detail since it is not the gist of the present invention. Oil level drop float switch 42) Oil pump 10a that detects oil level drop
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. Operate.

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 non-ii1 power determination signal to the non-power-on time setting timer 17B. At this time, the de-energized time setting timer 178 starts counting operation by the battery 179 and starts measuring the de-energized time. The de-energization time setting timer 178 is activated 5 times after the de-energization start signal from the de-energization determination circuit 176 arrives.
When the time period (d and t in FIG. 3) has elapsed, an interlock signal is introduced from the de-energization time setting timer 178 to the abnormal operation determination circuit 154, and the abnormal operation determination circuit 154 is connected to the external interlock contact control circuit. 156 and the machine tool 3 through the external interlock connection terminal 112.
An interlock signal is sent to an interlock input terminal (not shown) of 8a, and as a result, the operation of the machine tool is interlocked. At this time, the continuous open/close drive signal is supplied from the de-energization time setting timer 178 to the supply time setting timer 17.
It is introduced into the terminal α2 of 4.

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 Act power supply large-scale power-on is started. The circuit 172 timer start signal is input to the timer start terminal α of the supply time setting timer 174. In this case, as shown in FIG. 3d, the supply time setting timer 174 outputs N
The electromagnetic switching valve 58 is opened and closed twice. In the case of this embodiment, it was preferable that the number of operations be several tens of times. Note that when the Nth drive signal is applied to the control terminal 58c of the electromagnetic switching valve 58, an interlock release preliminary signal is sent from the de-energization time setting timer 178 to the abnormal operation determination circuit 15.
4, the interlock release signal of the abnormal operation determination circuit 154 is input to the external interface 7 and the contact control circuit 15
6 and the external interlock connection terminal 112 to release the interlock of the machine tool 38a.

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 waveforms shown in FIG.
a to 18e and pump operation LED 122a, 1
The operation of 22e is shown. Note that the explanation of the functions related to the other oil pumps 10b to 10e is based on the above-mentioned oil pump 10.
The detailed explanation will be omitted since it performs the same function as the function related to a.

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 oil pump driving electromagnetic switching valve a predetermined number of times via the plurality of timer circuits, 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 accidents 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 58... Solenoid switching valve 100... Electric circuit control section 156... External interlock contact control circuit 1
74... Supply time setting timer 176... De-energization determination circuit 178... De-energization time setting timer 180... Rest time setting timer 186... Reference oscillator

Claims (3)

[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 timer that measures a predetermined non-operation time of the machine tool is attached to the lubricating fluid supply device, and the lubricating fluid supply device The non-operating time of the machine tool, etc. is measured by the timer, and when it is detected that the machine tool is in the non-operating state for more than a predetermined set time, the signal causes the switching valve to be activated prior to starting the machine tool. A lubricating fluid supply device configured to open and deliver lubricating fluid to a machine tool. (2) In the device according to claim 1, when the power supply of the lubricating fluid supply device is energized after a predetermined non-operation time of the machine tool has elapsed, the switching valve is switched during normal operation of the machine tool. A lubricating fluid supply device that opens and closes at a higher speed for a predetermined period of time than a valve opens and closes. (3) The device according to claim 1 or 2, further comprising a first timer that determines a lubricating fluid supply time and a second timer that determines a lubricant supply stop time, When the machine tool is restarted within the operating time, the lubricating fluid supply device operates the switching valve by an operation that alternately combines the supply time and the rest time.