JP2000304193A - Control device for intermittent oil supplying and lubricating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change pressure rising monitoring time according to a system scale and to select oil supplying time by working environments by setting a period till a pressure switch is operated after a pump is operated and monitoring the period. SOLUTION: On an oil tank 1, a control device which is connected with a pump 2 and a motor of the pump 2 and controls the operation of the pump 2 is provided. The control device is connected with a float switch FS and a pressure switch PS. As a result, because monitoring time till the pressure switch PS is operated can be set by a timer, monitoring time till pressure is raised to one by which normal oil supply can be performed after the motor of the pump 2 is operated can be properly set, for instance. Therefore, an oil supply mistake for a spindle which instantaneously reaches high speed rotation after it is driven can be prevented and a safety monitoring according to a system is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an intermittent lubrication system for intermittently supplying lubricating oil to a machine tool or the like.

[0002]

2. Description of the Related Art An intermittent lubrication system with a built-in control device includes:
For example, as shown in FIG. 13, a pump 2 and a control device 3 for controlling the operation of the pump 2 are mounted on the oil tank 1, and various control means such as a float switch FS and a pressure switch PS and a control switch are provided on the control device 3. Are connected.

That is, as shown in FIG. 14, an operation preparation completion input terminal SW3 'for operating / stopping the control device and an operation preparation command signal input terminal SW2 for resetting an abnormal state are provided as shown in FIG. , An external interlock take-out terminal IL that outputs an emergency stop signal, a float forecast take-out terminal FO that outputs the timing of refueling the tank, a hydraulic pressure switch input terminal PS ′, and a float switch input terminal FS ′ are provided. The pump 2 is controlled based on detection signals from the pressure switch PS and the float switch FS.

Further, by inputting an operation preparation completion signal to an operation preparation completion input terminal SW3 'of the control device 3, it is possible to interlock with an external machine. You can also set a pause period.

[0005]

However, the above-described control device has the following problems.

[0006] 1. Due to the diversification of needs for intermittent lubricating lubrication systems in recent years, more detailed settings are required according to the system scale, such as changing the pressure monitoring time and selecting the working environment oil replenishment time.

[0007] 2. For example, there is a connection error at the terminal where the operation preparation command signal and the operation preparation completion signal are input,
For example, even if the machine tool is driven but the lubricating oil cannot be supplied due to the runaway of the control device, the lubricant cannot be detected until the equipment is damaged and external changes appear.

[0008] 3. When an abnormal state occurs, resetting clears the abnormal state. Therefore, in the case of a failure that is not reproducible, it is difficult to identify the location of the failure during later maintenance.

4. In the conventional lubrication system, there is a problem that the lubrication monitoring using only the pneumatic pressure is separately performed only by monitoring the hydraulic pressure while the same lubrication is performed, which is inefficient.

An object of the present invention is to make it possible to change the boost monitoring time according to the system scale and to select the oil replenishment time depending on the working environment. Next, it is possible to notify a connection abnormality or runaway of the microprocessor CPU. To do
Then, it is necessary to be able to specify a failure point at the time of maintenance, and to make it possible to incorporate lubrication using air pressure into the same system.

[0011]

According to the present invention, there is provided an oil tank, a pump for sucking and discharging lubricating oil in the oil tank, a pressure switch for detecting a discharge pressure of the oil, A control device for an intermittent oil lubrication device that includes a float switch for detecting an oil level of an oil tank, and controls an intermittent operation of a pump based on a detection signal of the pressure switch and the float switch. In this configuration, a period from when the pump is operated to when the pressure switch is operated is set and monitored.

By adopting such a configuration, the monitoring time until the pressure switch is operated can be set by the timer, so that, for example, the pressure at which normal lubrication can be performed after the pump motor operates. By appropriately setting the monitoring time until it rises, it is possible to prevent refueling errors for those that reach high-speed rotation after driving, for example, a spindle. Stop), and safety monitoring according to the system becomes possible.

[0013] Further, the timer means and the setting means generate an alarm after the float switch detects a decrease in the oil level, and generate an abnormal lubrication when the rise in the oil level is not detected after a predetermined time has elapsed. By adopting the configuration, for example, if an alarm time is set from when the oil level is lowered to when refueling is performed, a refueling error can be prevented even if the refueling time varies depending on the site used by the alarm. .

Further, by adopting a structure in which the float switch detects the upper limit and the lower limit of the oil level of the tank, for example, after the oil level is lowered and the float switch of the lower limit level is activated, the upper limit level is set. By outputting the refueling command signal until the float switch is operated, if this output is used, refueling can be automated. For this reason, it can be used even in an environment where a factory operates automatically.

Further, by adopting a structure in which the pressure switch comprises a pressure switch for detecting a low pressure and a pressure switch for detecting a high pressure, the pressure switch is controlled by using only the pressure switch for detecting the high pressure. If the control using the pressure switch is selected, fine control of the hydraulic pressure can be performed.

Further, by adopting a configuration in which an air mixer is provided in the intermittent oil supply lubricating apparatus and air pressure detecting means is provided in the air mixer, lubrication using both general lubrication and air pressure can be incorporated into the same system. it can.

Further, the control device comprises means for constantly monitoring the connection from power-on to power-off, and means for checking the connection immediately after power-on and for preventing normal operation if the connection is not normal. By adopting the configuration including the check means, the connection abnormality can be notified by monitoring the connection from power-on to power-off. At this time, the connection is checked immediately after the power is turned on, and if the connection is not normal, the operation is prohibited and the damage to the device can be prevented.

Further, by employing a configuration in which the control device is provided with a watchdog timer, runaway of the control device can be detected.

Further, by adopting a configuration in which the control means is provided with a memory means for storing an abnormal state, the cause of a failure having no reproducibility can be specified quickly and accurately.

At this time, an LED for displaying the contents of the memory
By employing the configuration provided with the display lamp, an abnormal state can be specified from the display of the LED display lamp.

Further, by adopting a configuration in which a connection connector is provided in the above-mentioned control device so that it can be connected to an external input device, various settings of the control device and setting of parameters can be performed using the external input device. it can.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. At this time, the same reference numerals are given to the portions described in the conventional example, and the detailed description is omitted.

FIG. 1 shows an intermittent lubricating lubrication system with a built-in control unit according to the present invention.

As shown in FIG. 1, the intermittent oil supply lubricating device includes a pump 2 and a motor M
And a control device 3 'for controlling the operation of the pump 2. The control device 3' includes a float switch FS and a pressure switch PS which will be described later, as shown in FIG.
Are connected.

That is, in this embodiment, the float switch FS is composed of upper and lower level float switches FS-H and FS-L.

The pressure switch PS is connected to the pump 2
Low pressure detection pressure switch P provided on the discharge pipe 4
SL and a pressure switch PS-H for high pressure detection, and a pressure switch PS for detection attached to an air supply pipe 6 connected to an air mixer 5 at the end of the discharge pipe 4.
-A.

As shown in FIG. 2, the control device 3 'is provided with a microprocessor CPU, and as a memory m for storing an abnormal signal, an EE which can be rewritten by electric erasure.
A PROM is provided. As described above, by providing the EEPROM which is a nonvolatile memory, when an abnormal signal is detected, the fact is written by the microprocessor CPU so that the abnormal state can be saved even when the power is turned off. .

The microprocessor CPU is provided with a watchdog timer W. The watchdog timer W outputs an alarm signal when the microprocessor CPU does not respond for a predetermined time.

Further, the microprocessor CPU is the same as that shown in FIG.
As shown in (1), it is connected to a display LED via a drive circuit D.

As shown in FIG. 3, the display LED comprises a plurality of LEDs provided on the display panel of the control device 3 '. When an abnormality occurs, the display of each LED is CK: power supply, HPS: Poor pressure rise, LPS: Poor depressurization, AP
S: Low air pressure, FS: Low oil level, LA: Connection error, MA: Microcomputer error, AS: Lubrication error (shown in the lighting condition table in FIG. 4). It can be used as a monitor display for monitoring.

In addition, the microprocessor CPU has a processing program for connection check, and is connected to a reset switch SW1, a setting DIP switch DS and the like.

The dip switch has ten contacts. In this embodiment, seven contact points 4 to 10 are used to switch the operation mode of the float switch, set the alarm mode at the time of automatic refueling, and monitor the boosting time. Settings, switching of pressure switch operation modes (low pressure and high pressure switches), and setting of connection check.

This embodiment is configured as described above. Next, the operation thereof will be described with reference to the flowcharts of FIGS.

In this control device 3 ', the pressure switch PS
, A detection mode of the tank 1 oil level, a connection abnormality detection mode, an abnormal state display mode, and an abnormality detection mode of the microprocessor CPU. Is performed using the dip switch DS.

Therefore, for each mode, its function and
The setting of the dip switch DS will be described together.

First, a description will be given of a mode for detecting a pressure rise and a pressure release failure by the pressure switch PS with reference to FIG. In this case, by setting the sixth and seventh dip switches, the boost monitoring time can be set as shown in FIGS. For this reason, the setting can be adjusted to the system. Thereafter, when the power is turned on (“processing” 100: the processing is omitted below), the microprocessor CPU of the control device 3 ′ reads the state of the reset switch SW1, and if the switch SW1 is off (110), drives the pump 2 (110). 120), if the pressure switch PS is off (130), it is detected whether or not the pressure switch PS is turned on before the set pressure monitoring time elapses (140). At this time, if the pressure switch PS is off, an abnormal signal is output (150), and the pump 2 is emergency stopped (160). For example, the equipment connected to the lubricating oil device is also emergency stopped.

Then, the AS and HPS of the LED are turned on (170), the abnormal state is stored in the memory m (180), and the operation waits until the reset switch SW1 is operated (19).
0). When the reset switch SW1 is operated, the output of the abnormal signal is stopped (200), the AS and the HPS of the LED are turned off (210), and the state returns to the state where the pump 2 is operated again.

As described above, the monitoring time until the pressure switch PS is operated is set by the timer means, and the pump 2
The safety monitoring can be performed by appropriately selecting the monitoring time from when the motor M is operated to when the pressure rises to the refuelable pressure.
For example, it is possible to detect abnormalities at the time of refueling in a short time even for a spindle that reaches a high-speed rotation immediately after driving, and prevent damage to the equipment. Can be stopped).

On the other hand, if the pressure switch PS is turned on within the pressure monitoring time (140) and is turned on (130), after the elapse of the pressure holding time (250), the pump 2 is stopped (2).
60). If the pressure switch PS is turned off (280) after the elapse of the pause time (270), the state returns to the state where the pump 2 is operated again. Conversely, if the pressure switch is turned on after the elapse of the pause time (280), an abnormal signal is output as a pressure release failure (290), and the pump is stopped emergency (300).
Then, the AS and LPS of the LED are turned on (310), the abnormal state is stored in the memory m (320), and the operation waits until the reset switch SW1 is operated (330). Here, when the reset switch SW1 is operated, the output of the abnormal signal is stopped (340), the AS and LPS of the LED are turned off (350), and the pump 2 returns to the state where the pump 2 is operated again. Therefore, it is possible to prevent an accident due to insufficient pressure release.

Here, the presence or absence of an abnormal state stored in the memory m can be read out in the abnormal state display mode.

That is, at the same time when the power is turned on (10
0), by operating the reset switch SW1 (110), the abnormal state display mode can be entered.

When entering this mode, the microprocessor CPU displays L to indicate that this mode has been entered.
CK and AS of ED are blinked (400). Then, the contents of the memory m are displayed by the LED (410). For example, if each bit of the memory m is a display flag corresponding to the type of abnormality, the bit may be activated when an abnormality occurs, and the display LED is turned on and off according to the content of the bit. Is determined, the contents of the memory m can be displayed. Because you can always display abnormalities like this,
Even if the failure is not reproducible, subsequent maintenance can be easily performed.

When clearing the memory m, when the reset switch SW1 is operated during the abnormal state display mode (420), the contents of the memory m are cleared.
30), stop displaying the abnormal state and turn off the light (44)
0). At this time, only the AS and CK of the LED blink, indicating that the clear operation has been completed. Therefore, it is possible to return to the initial state when the power is turned off (45).
0).

By the way, when the abnormal state is not stored in the memory m, that is, when the previous abnormal state has been cleared or has not been in the abnormal state, the power is turned on with the reset switch SW1 turned on. (That is, during the abnormal state display mode), CK and AS are kept blinking so as to be notified.

Next, in the oil level detection mode, the float switch FS is set using the DIP switches 4 and 5.
Switch the operation mode. The settings are shown in FIG.

For example, the oil level detection mode is a mode in which the No. 4 and No. 5 are turned off, and as shown in FIG. 9, when the lower limit float switch FS-L operates (800), an abnormal signal is output (FIG. 9). 810) Emergency stop of the pump 2 (82)
0). Then, the AS and FS of the LED are turned on (83
0) An abnormal state is notified, and the fact of the abnormal state is stored in the memory m (840). When the oil is supplied to the oil tank 1 by the notification (850) and the reset switch SW1 is operated (860), the output of the abnormality signal is stopped (87).
0), the AS and FS of the LED are turned off, and the process returns to 1 in FIG.

As shown in FIG. 9, by turning off the No. 4 dip switch DS and turning on the No. 5 dip switch, the microprocessor CPU can reduce the oil level and operate the lower limit float switch FS-L. , Upper limit float switch F
Since the refueling command signal is output until the SH is activated, the use of this signal enables non-stop use even in an environment where a plant is automatically operated.

Further, as shown in FIG. 8, by turning on the No. 4 dip switch DS and turning off the No. 5 dip switch, the oil level is lowered, the lower limit float switch FS-L is operated, and the refueling command signal is transmitted. When output, the timer means is started, and if refueling is not completed within an alarm time of, for example, about 15 minutes, the pump 2 is emergency stopped. By doing so, refueling mistakes can be prevented.

In the connection abnormality detection mode, as shown in FIG. 6, the validity / invalidity of the connection check function is switched using the 9th and 10th dip switches DS. When turned on, the connection check function can be used.
And the connection monitoring of SW3 becomes effective. When the switch is off, connection monitoring of the switches SW2 and SW3 is not performed.

That is, in connection monitoring, the ninth is on,
When the number 10 is on, the conduction state of the switches SW2 and SW3 is monitored only when the power is turned on, and the number 9 is on,
When the number 10 is off, the power supply state of the switches SW2 and SW3 is constantly monitored from the time the power is turned on to the time the power is turned off.

Incidentally, the monitoring of the energized state is performed, for example, by the control device 3 'connected to the switches SW2 and SW3.
Is used as an input / output terminal, detection can be performed by passing a current from one terminal of the switches SW2 and SW3 connected to the terminal to the other terminal.

As shown in FIG. 10, when an abnormality is detected (900, 910), an abnormal signal is output (920), the AS and LA of the LED are turned on (930), and the abnormal state is stored in the memory m. (940). Next, the display state is held until the operation completion signal and the operation preparation signal by the switches SW2 and SW3 are input (950, 960). When the operation completion signal and the operation preparation signal are input, the output of the abnormality signal is stopped (970), and the LED is turned off.
AS and LA are turned off (980). Although not shown in FIG. 10, the abnormal signal stored in the memory m can also be displayed in the abnormal state display mode shown in FIG.

In the abnormality detection mode of the microprocessor CPU, when the watchdog timer W detects a runaway of the microprocessor CPU as shown in FIG.
0), with the signal, for example, microprocessor C
The PU is restarted to output an abnormal signal (1100), and the pump 2 is stopped (1200). Then, the AS and MA of the LED are turned on (1300), and the abnormal state is stored in the memory m (1400). Next, the display state is maintained until the reset signal from the switch SW1 is input (15).
00). Then, the output of the abnormal signal is stopped (170
0) The AS and MA of the LED are turned off (1600), and the process returns to 1 in FIG.

Next, there is an air pressure detection function mode. In this mode, the air pressure of the air supply pipe 6 connected to the air mixer 5 of FIG. 1 is monitored, and when the air pressure of the air pressure detection pressure switch PS-A decreases for 5 seconds or more, the external interlock is performed. An abnormal signal is output from the extraction terminal. Therefore, an abnormal signal is output with this signal, and the pump 2 is stopped. Then, the AS and APS of the LED are turned on, and the abnormal state is stored in the memory. Next, the reset is activated, and when the air pressure is normal, the output of the abnormal signal is stopped, and the AS and APS of the LED are turned off.

As described above, the abnormality of the air pressure is also detected, and the lubrication using both the general lubrication and the air pressure can be incorporated in the same system.

Incidentally, the above-described dip switch DS
If the function setting switch of the intermittent oil supply lubrication device is incorrectly set, serious damage may be caused to a machine tool or the like. For this reason, it is necessary to prevent the user from mistakenly setting the device by installing it in a place where the setting cannot be easily changed or in a place where it is hard to see.

However, when such a device is devised, it is presumed that, for example, when the setting of many intermittent lubricating and lubricating devices must be changed in a factory or the like, the work becomes difficult.

If the intermittent oil lubrication system becomes multifunctional, the number of setting items increases, and the number of switches DS also inevitably increases. However, the control device 3 'of the intermittent lubrication device
Also, there is a tendency to be compact, and if the number of switches DS is large, the size per switch DS is also small, so that setting change becomes more difficult.

Therefore, FIG. 12 shows a second embodiment in which a connection connector CN is provided in place of the DIP switch DS of the control device of the first embodiment to enable connection with an external input device I.

That is, the connector CN is connected to the microprocessor CPU inside the control device, and the connector CN connected to the microprocessor CPU
Is connected to an external input device I such as a personal computer via an interface f.

By doing so, for example, while viewing the display screen of the personal computer I, data is exchanged with the internal microprocessor CPU to make various settings and parameters (pressure holding time, pressure switch, etc.) of the control device 3 '. , Etc., to detect the pressure).

Further, as shown in FIG.
For example, when the switch is connected to the B side, the normal operation is performed. When the switch is connected to the A side, the setting can be changed from the external input device I via the interface f. The input device I can be used freely and safely.

As described above, by allowing the external input device I to change the settings and parameters of the control device 3 ', when the necessity of the change arises, the change can be easily made, and Since the setting cannot be changed without the interface, it is possible to prevent the setting from being changed accidentally (unintentionally).

At this time, since the external input device I can be used with good operability regardless of the miniaturization of the control device 3 ', the operability at the time of change can be improved.

Therefore, the setting can be efficiently changed even when a large number of intermittent lubricating and lubricating device controllers are used in a large-scale system such as a factory. In other words, since the setting of the control device 3 'can be easily and safely changed according to the mechanical and electrical changes, the control device 3' can be used for a machine that must cope with any situation such as a general-purpose machine tool. In addition, it is possible to provide the control device 3 ′ of the intermittent lubrication lubrication device that can be further adapted.

[0066]

As described above, according to the present invention, it is possible to change the boosting monitoring time according to the system scale and to select the oil replenishment time according to the working environment. In addition, since abnormality in connection or runaway can be reported, the user can use the apparatus with peace of mind, and can identify a failure point during maintenance. Therefore, maintenance can be facilitated, and lubrication using air pressure can be incorporated in the same system.

At this time, a connection connector is provided in the control device so that it can be connected to an external input device.
It is possible to provide a control device of an intermittent lubricating lubrication device that can easily and safely change a setting.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment.

FIG. 2 is a circuit block diagram of the embodiment.

FIG. 3 is a front view of a main part of the embodiment.

FIG. 4 is a diagram illustrating the operation of the embodiment.

FIG. 5 is a flowchart of an embodiment.

FIG. 6 is an operation explanatory view of the embodiment.

FIG. 7 is a diagram illustrating the operation of the embodiment.

FIG. 8 is a diagram illustrating the operation of the embodiment.

FIG. 9 is a flowchart of an embodiment.

FIG. 10 is a flowchart of the embodiment.

FIG. 11 is a flowchart of an embodiment.

FIG. 12 is a circuit block diagram of a second embodiment.

FIG. 13 is a block diagram of a conventional example.

FIG. 14 is a circuit block diagram of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Oil tank 2 Pump 3 Control device 3 'Control device 5 Air mixer CN Connector f Interface FS Float switch FS-H Upper limit float switch FS-L Lower limit float switch PS Pressure switch PS-A Pressure switch for air pressure detection PS- H Pressure switch for high pressure detection PS-L Pressure switch for low pressure detection I External input device w Watchdog timer

Claims (10)

[Claims] An oil tank, a pump for sucking and discharging lubricating oil in the oil tank, a pressure switch for detecting a discharge pressure of the oil tank, and a float switch for detecting an oil level in the oil tank; A control device for an intermittent lubricating device that controls an intermittent operation of a pump based on detection signals of a switch and a float switch, wherein a timer means and a setting means thereof are provided, and from when the pump operates to when the pressure switch operates. The control device of the intermittent lubrication system that sets and monitors the period of time. 2. The system according to claim 1, wherein the timer means and the setting means generate an alarm after the float switch detects a decrease in the oil level, and generate a lubrication abnormality if the rise of the oil level is not detected after a predetermined time has elapsed. The control device for an intermittent oil lubrication device according to claim 1. 3. The control device for an intermittent lubrication system according to claim 1, wherein the float switch detects an upper limit and a lower limit of an oil level in the tank. 4. A control device for an intermittent lubrication system according to claim 1, wherein said pressure switch comprises a pressure switch for detecting a low pressure and a pressure switch for detecting a high pressure. 5. The intermittent lubricating device according to claim 1, wherein an air mixer is provided in the intermittent lubricating device, and an air pressure detecting means is provided in the air mixer. Control device. 6. A connection comprising means for constantly monitoring the connection of the control device from power-on to power-off, and means for checking the connection immediately after power-on and not transferring to normal operation if the connection is not normal. The control device for an intermittent lubrication system according to any one of claims 1 to 5, further comprising a check unit. 7. The control device for an intermittent refueling lubrication device according to claim 1, wherein the control device includes a watchdog timer. 8. The control device for an intermittent refueling lubrication system according to claim 1, wherein said control means includes a memory means for storing an abnormal state. 9. The control device for an intermittent refueling lubrication device according to claim 8, further comprising an LED display lamp for displaying the contents of the memory. 10. A connector is provided on the control device,
The control device for an intermittent lubricating device according to any one of claims 1 to 9, wherein the control device can be connected to an external input device.