JPH0366555B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial 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 and the like built into cutting machines such as machining centers and NC lathes have relatively large shaft diameters and are generally driven at low speeds. Therefore, grease is mainly used as a lubricating medium.

[Problem to be solved by the invention]

However, in recent years, even in fields where machine tools are used, such as NC lathes, there has been a demand for faster equipment in order to improve work efficiency. However, the conventional grease lubrication system cannot meet this demand because it cannot tolerate deterioration in 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.
This method has not yet been adopted because of the problems of safety when supplying micro mist and deterioration of the working environment due to exhaust mist.

Therefore, an air-oil lubrication system was developed to improve this problem, but this system is extremely suitable for high-speed rotation due to the low viscosity of air oil, but once the work is stopped, the 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 before oil is supplied to the spindle and 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 a supply device for air oil as a lubricating fluid. When operating a machine tool, etc. after a set energization time, an amount of lubricating fluid corresponding to the length of the non-energization time is immediately supplied, so that the machine tool is almost immediately operated in a normal state. An object of the present invention is to provide a lubricating fluid supply device that enables the following.

[Means to solve the problem]

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 an electromagnetic switching valve, which determines whether the machine tool is in an energized or de-energized state. an energization determination circuit; a first timer that receives a de-energization determination signal derived from the energization determination circuit and measures a de-energization time of the machine tool; and a de-energization time of the machine tool measured by the first timer. a second timer that sets a lubricating fluid supply time according to the lubricating fluid supply pump; and an electromagnetic valve drive circuit that receives a setting output signal from the second timer and drives an electromagnetic switching valve connected to the lubricating fluid supply pump. , when the machine tool is re-energized, the lubricating fluid supply time setting output signal is derived from the second timer according to the output signal of the energization determination circuit before starting, and the solenoid valve drive circuit is controlled to operate the solenoid valve drive circuit. The lubricating oil is supplied to the machine tool by energizing it a number of times according to the non-energization time of the machine tool.

[Effect]

The present invention provides a method for supplying a predetermined amount of lubricating fluid to the machine tool for a predetermined period of time corresponding to the de-energization time before starting the machine tool when the machine tool is de-energized and then restarted. By supplying lubricating fluid, it is possible to prevent troubles caused by excessive supply of lubricating fluid and insufficient circulating fluid, and to quickly start up the machine tool.

〔Example〕

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 10
a indicates an oil pump. The oil pump 10
a is a piston portion 22 that comes into sliding contact with the cylinder 11a;
a, 26a and a piston rod 20a.
A spring 28a is locked to the piston rod 20a, one end of the spring 28a is seated on the cylinder 11a, 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 oil is introduced from an oil tank 40 into an oil inlet 14a of the chamber 16a via a check valve 12a. 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 the pressure switch 18a;
The output signal of a is introduced into the electric circuit control section 100.

On the other hand, the oil outlet spring-loaded check valve 32
The other end of a communicates with a transparent tube 36a via a variable orifice 34a constituting the mixing valve 33, and the other end of the tube 36a communicates with a machine tool 38a whose details are not shown. Said cylinder 1
Air introduction outlet 25a for chamber 30a in 1a
The air introduction outlet 25a communicates with the 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 is connected to a pressure gauge 52, a port 58a of an electromagnetic switching valve 58, and a pressure switch 5.
4, it communicates with a compression pump 56 (not shown). Pressure detection terminal 54 of the pressure switch 54
a faces the pipe line connected to the compression pump 56.

On the other hand, a float switch 42 is disposed in the oil tank 40, and the float switch 42
The second output terminal is connected to terminals 104a and 104b in the electric circuit control section 100. The control terminal 58c of the electromagnetic switching valve 58 is connected to the terminals 106a and 106b of the electric circuit control section 100, and further connected to the operation setting terminal 54 of the pressure switch 54.
b and 54c are connected to terminals 102a and 102b of the electric circuit control section 100, respectively. Downtime setting timer setting knob 1 in the electric circuit control unit 100
Reference numeral 24 is for determining a pause time when air oil is intermittently supplied to the machine tool.

Next, in FIG. 2, reference numerals 110a, 1
10b is an AC power input terminal, and the output of the AC power input terminal is 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 AC
The oil pump 10 is connected to the oil pump 10 via an AC power-on start circuit 172 that detects that the power is turned on.
It is connected to the first input terminal α ₁ of a supply time setting timer 174 that determines the oil supply time from a to 10e. Note that the DC power source of the stabilized power source 170 is
Although not shown in the figure, it is also supplied to each of the other blocks.

The output signal of the de-energization determination circuit 176 is, for example,
It is introduced into the first input terminal of a non-energizing time setting timer 178, which sets the non-energizing time to 5 hours. A battery 179 is connected to the second input terminal of the de-energized time setting timer 178.
79 is the de-energization time setting timer 17 only when de-energized.
Operate 8. Note that the other end of the battery 179 is grounded. The de-energization time setting timer 17
The output signal of a reference oscillator 186 which oscillates based on the crystal oscillator 118 is introduced into the clock input terminal of 8. Further, the output terminal of the de-energization time setting timer 178 is connected to the second input terminal α ₂ of the supply time setting timer 174 and also to one input terminal of the abnormal operation determination circuit 154 . The output signals of the pressure switches 18a to 18e are sent to the other input terminal of the abnormal operation determination circuit 154 via amplifiers 150a to 150e, respectively.
2a to 152e. 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 input to the other input terminal of the external interlock contact control circuit 156 and the pressure increase determination circuit 15
It is connected via one output terminal of 8. In addition,
The other output terminal of the pressure increase determination circuit 158 is connected to an LED that lights up when the pressure increases. The external interlock contact control circuit 15
Output terminal 6 is external interlock connection terminal 11
Connected to 2. 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 connected to the third input terminal α ₃ of the supply time setting timer 174 via the setting time setting circuit 182. 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 input to the oil level abnormally low contact circuit 162 via the terminal 104 and the interface 160. The output signal of the abnormally low oil level contact circuit 162 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 of FIG. 3.

First, after a de-energizing time that is shorter than a predetermined time (5 hours in this embodiment) determined by the de-energizing time setting timer 178, the AC power is connected to the AC power input terminal 11.
It is supplied through 0a and 110b. Stabilized power supply 1
70 is activated and the AC power supply start circuit 172 is activated.
When the DC 12V voltage is applied, the AC power supply start circuit 172 sends a supply time setting timer start signal to the supply time setting timer 174. At this time,
In this embodiment, the supply time setting timer 174 is set for approximately 1 second (t ₁ period in FIG. 3), and the supply time setting timer 174
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 11a in the direction of arrow A in FIG. 1 to narrow the chamber 16a. . At this time, the oil stored in the chamber 16a passes through the spring-loaded check valve 32a to the pipe body 36.
It is derived to a. On the other hand, compressed air from the pressure pump 56 is introduced into the pipe body 36a through the variable orifice 34a, and the oil and compressed air are mixed in the mixing valve section 33 to become 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 T ₁ shown in FIG. The set time set by the down time setting timer 180 is determined by the set time determining circuit 182, and the determination signal is input to the down time setting terminal α ₃ of the supply time setting timer 174. Thereafter, during the pause time t ₂ (6 seconds in the embodiment) shown in FIG. 3a, the electromagnetic switching valve 5
8 becomes inactive, the oil pump 10
The air in the chamber 30a of the piston rod 20a is led out from the air introduction outlet 25a.
The piston moves in the direction B in the figure due to the repulsive force of the spring 28a, which is engaged with the chamber 16a.
Oil is introduced from the oil tank 40 and stored. After time T ₂ , the above-mentioned actions related to hours t ₁ and t ₂ are repeated. Note that when the piston rod 20a moves in the direction A in the figure during the t ₁ hour period, the chamber 16
When the internal pressure inside a increases, the pressure switch 18a is activated, and the oil pump operation LED 12 is activated via the amplifier 150a and the operation determination circuit 152a.
Turn on 2a. In this case, since the pressure is normal, the abnormal operation determination circuit 154 does not operate. In addition,
3b and 3c show the operating status of the pressure switch 18a and the pump operating LEDs 122a to 1.
The operating state of 22e is shown by hatching.

Next, a detailed description of the circuits related to the interlock for abnormal operation such as the oil level lowering 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, chamber 16a in oil pump 10a
The abnormal operation determination circuit 154 operates when the pressure of the oil pump 10a 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. .

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 stabilized power supply 17
The output signal of 0 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. The de-energization time setting timer 178 starts the de-energization time setting timer 1 when, for example, 5 hours (d, t3 in FIG. ₃ ) have elapsed since the de-energization start signal from the de-energization determination circuit 176 arrived.
An interlock signal is introduced from 78 to the abnormal operation determination circuit 154, and the abnormal operation determination circuit 154
sends an interlock signal to an interlock input terminal (not shown) of the machine tool 38a through the external interlock contact control circuit 156 and the external interlock connection terminal 112, so that the operation of the machine tool is interlocked. Also, at this time, a continuous opening/closing drive signal is introduced from the non-energizing time setting timer 178 to the terminal α ₂ of the supply time setting timer 174.

If AC power is turned on again under this condition,
When the stabilized power supply 170 operates, the de-energization determination circuit 176 operates, and the de-energization time setting timer 178
is reset, and at the same time, a timer start signal is input from the AC power supply start circuit 172 to the timer start terminal α ₁ of the supply time setting timer 174 . 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. When 5 hours elapsed as in the present example, it was preferable to perform this operation several dozen times. Note that the N-th drive signal is applied to the control terminal 58c of the electromagnetic switching valve 58.
When the interlock release preliminary signal is input from the de-energization time setting timer 178 to the abnormal operation determination circuit 154, the abnormal operation determination circuit 15
The interlock release signal of 4 passes through the external interlock contact control circuit 156 and the external interlock connection terminal 112 to release the interlock on the machine tool 38a.

Therefore, as shown in FIG. 3d, the electromagnetic switching valve 58 intermittently supplies oil N times, so that it remains inactive for a long time, and as a result, it is left in an oil-depleted state. Machine tool 3
8a is instantly replenished with air oil. After this, the machine tool will work normally. In this case, the waveforms shown in FIGS.
a to 18c and pump operation LED 122a,
122e. Note that a detailed explanation of the operations related to the other oil pumps 10b to 10e will be omitted since they perform the same operations as those related to the oil pump 10a described above.

〔Effect of the invention〕

As described above, according to the present invention, by disposing the oil pump drive electromagnetic switching valve and the 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 in response to the non-energization time of the device;
An amount of lubricating fluid corresponding to the length of the non-energized time 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 drawings]

Fig. 1 is an air/electrical circuit diagram according to the present invention;
The figure is a detailed circuit block diagram of the electric control section according to the present invention, and FIG. 3 is a timing chart showing the operation of the main parts of the air/electric circuit diagram shown in FIGS. 1 and 2. 10a...Oil pump, 38a...Machine tool, 4
0...Oil tank, 42...Float switch, 5
2... Pressure gauge, 54... Pressure switch, 58... Solenoid switching valve, 100... Electric circuit control section, 156... External interlock contact control circuit, 174... Supply time setting timer, 176... Non-energized constant circuit, 178... Non-energized Time setting timer, 180... Pausing time setting timer,
186...Reference oscillator.

Claims (1)

[Scope of Claims] 1. A lubricating fluid supply device that introduces and draws out lubricating fluid to a machine tool by opening and closing an electromagnetic switching valve, comprising: an energization determination circuit that determines whether the machine tool is in an energized or de-energized state; a first timer that measures a de-energized time of the machine tool in response to a de-energized determination signal derived from the de-energized determination circuit; and a lubricating fluid according to the de-energized time of the machine tool measured by the first timer. a second timer for setting the supply time of the lubricating fluid; and an electromagnetic valve drive circuit that receives a setting output signal from the second timer and drives an electromagnetic switching valve connected to the lubricating fluid supply pump, When the machine is reenergized, a lubricating fluid supply time setting output signal is derived from the second timer based on the output signal of the energization determination circuit before the machine is started, and the solenoid valve driving circuit is set to the non-energized time of the machine tool. A lubricating fluid supply device characterized in that it supplies lubricating oil to a machine tool by energizing it a number of times according to. 2. In the device according to claim 1,
When the power supply of the lubricating fluid supply device is energized after the non-operating time of the machine tool has elapsed, the electromagnetic switching valve is operated according to the non-energizing time compared to the opening/closing operation of the electromagnetic switching valve during normal operation of the machine tool. A lubricating fluid supply device that opens and closes at high speed a number of times. 3. The device according to claim 1 or 2, further comprising a second timer that determines the lubricant supply time and a third timer that determines the lubricant supply stop time, and wherein the supply time is determined during the energization operation. A lubricating fluid supply device comprising operating the electromagnetic switching valve by a normal operation in which periods of rest and rest are alternately combined.