JPS6283596A - Oil and air lubricating device - Google Patents

Abstract

PURPOSE:To quickly exhaust air by providing an air vent switch to establish an air vent mode, and a driving circuit to continuously drive a pump under a predetermined condition at intervals shorter than working intervals for the lubrication of bearings. CONSTITUTION:A controller 24 is provided with an air vent switch 60, and a driving circuit 20 which functions, when the switch 60 is kept at ON, to continuously drive a pump 38 at intervals shorter than working intervals for the lubrication of bearings 22. The air vent switch 60 is worked to make the driving circuit 20 function, and thereby the pump 38 is driven at the intervals shorter than the working intervals for the lubrication of the bearings 22 to exhaust residual air in an oil path 39. Thus, the residual air can be quickly and easily exhausted out of the oil path.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an oil-and-air lubrication device that supplies oil and air to a bearing for lubrication.

<Prior Art> Conventionally, as shown in FIG. 6, this type of oil and air lubricating device connects a bearing l and an air supply source 2 through an air supply pipe 4, while connecting the air supply pipe 4 with A side passage 5 is provided, and an oil injection valve 9 having an on-off valve 6 and an oil supply source 8 which are opened and closed intermittently sequentially from a position close to the air supply source 2 is provided in this side passage 5, and - the air supply pipe 4 and It has been proposed to provide a gas, oil, and mixer 11 at the confluence of the side paths 5 (see Japanese Patent Laid-Open No. 146792/1983).

The oil and air lubricating device intermittently supplies compressed air from an air supply source 2 to an oil injection 9 through an on-off valve 6 and a side passage 5 that are intermittently opened and closed by a controller or roller 6a or a timer (not shown). After this compressed air is supplied, the oil injection 9 is actuated to transport the lubricating oil from the oil supply source 8 to the air/oil mixer 11, and then the oil/air mixer 11 is supplied with the compressed air from the air supply source 2. The lubricant is mixed with the above-mentioned lubricant well in a non-mist state and is intermittently supplied to the bearing 1 through the air supply pipe 4.

By the way, in the conventional oil and air lubrication device mentioned above,
During initial operation or when piping is removed for repairs, air gets mixed into the side passage 5 between the oil injection pump 9 and the air/oil mixer 11, so even if the oil injection 9 is activated, the above side Unless the residual air in the passage 5 is discharged, a lubrication well cannot be supplied to the air-oil mixer 8, and the bearing 1 cannot be lubricated. For this reason, in the past,
Be sure to bleed air from the starting surface of bearing 1.
Two feet had eliminated residual air. In this air purge work, the time interval at which the controller 6a opens and closes the on-off valve 6 is usually 6.
Since the time is longer than 0 seconds, the air purge operation is slow, and therefore, the oil injection pump 9 must be operated manually several times repeatedly to bleed the air, which is troublesome as it takes time and effort to bleed the air. There was a problem. Furthermore, in the conventional method, the completion of air purge had to be carried out by direct visual inspection by the operator.

<Object of the Invention> Therefore, the object of the present invention is to automatically and quickly and easily discharge residual air to the outside of the oil passage even if air gets mixed into the oil passage during initial operation or during repairs. An object of the present invention is to provide an oil-and-air lubrication device that can quickly restart a bearing.

<Configuration of the invention> In order to achieve the above object, the configuration of this invention is as follows:
As illustrated in the figure, the controller 24 is provided with an air bleed switch 60, and a drive circuit that operates when the air bleed switch 60 is turned on and continuously drives the pump 38 at intervals shorter than the operating interval during lubrication of the bearing 22. 20 is provided, and the air vent switch 60 is actuated to open the drive circuit 20.
The basic feature is that the residual air in the oil passage 39 can be discharged by driving the pump 38 at intervals shorter than the operating interval during lubrication of the bearing 22. More specifically, an air supply source 21 that sends out compressed air, a pump 38 that intermittently discharges the air from the air tank 36, a controller 24 that controls the pump 38, the air discharged from the pump 38, and the air supply i21. The controller 24 is provided with an air-oil mixer 31 that mixes the compressed air fed under pressure and conveys it to the bearing 22, and the controller 24 is provided with an air-bleeding switch 60 for setting an air-bleeding mode. A drive circuit 20 is provided to operate the pump 38 continuously at shorter intervals than the operating interval during lubrication of the bearing 22.
The present invention is characterized in that the pump 38 is driven according to preset conditions by a signal from 0 to remove the air existing in the iih passage 3 passage 9.

<Operation of the Invention> In the above configuration, when the air vent switch 60 in the controller 24 is turned on, the drive circuit 20 is activated to operate the pump 38 under a predetermined condition at a time interval shorter than the operation interval during lubrication of the bearing 22. Drive according to the following. Then, the residual air in the oil passage 39 is gradually discharged, and the pump 3
When the oil passage 39 is driven until the predetermined conditions are satisfied, the residual air in the oil passage 39 is exhausted to the extent that it can be almost ignored. Thereafter, the air is discharged from the pump 38, mixed with air from the air supply source 21 in a non-mist state by the air/oil mixer 31, and conveyed to the bearing 22. Therefore, after the air purge operation is completed, the residual air in the oil passage 39 is exhausted, and the bearing 22 can be operated smoothly.

<Example> Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

FIG. 1 is a hydraulic circuit diagram of an oil and air lubrication system according to an embodiment of the present invention, and FIG. 2 is a block diagram of a controller. In FIG. 1, 21 is an air supply source, 22 is a bearing, 24 is a controller, 31 is an air-oil mixer, and 38 is an air-driven pump as an example of a pump.

The air supply source 21 and the bearing 22 are connected by an air supply path 25. In this air supply path 25, sequentially from the upstream side,
It has a two-position electromagnetic switching valve 26, a check valve 28, and a variable throttle valve 29, which open and close the compressed air from the air supply source 21 intermittently according to signals from the controller 24. Bearing 2 is mixed in a non-mist state.
2. Air and oil mixer 31. A first pressure switch 32.3 and a second pressure switch 32.3=1 are provided to detect the supply pressure of the bearing 22 and output a signal to the controller 24, respectively.

The first pressure switch 32 detects the pressure when both compressed air and lubricating oil are conveyed to the bearing 22, while the second
The pressure sensor 34 detects the pressure when only compressed air is conveyed to the bearing 22. therefore,
The set pressure of the first pressure switch 32 is set to the second pressure switch 3.
It is set higher than the set pressure of No. 4. Further, a third pressure switch 35 is provided in the air supply path 25 on the outlet side of the electromagnetic switching valve 26 to detect air pressure and output a signal to the controller 24. An oil passage 39 connects the air-oil mixer 31 and an air-driven pump 38 connected to an oil tank 36. A fourth pressure switch 41 detects the pressure of this oil passage 39 and outputs a signal to the controller 24.
has been established. Further, another two-position electromagnetic switching valve 42 is provided between the air-driven pump 38 and the air supply path 25, and the electromagnetic switching valve 42 is intermittently opened and closed by a signal from the controller 24. When the valve 42 opens, compressed air is supplied to the air-driven pump 38 and the piston inside the air-driven pump 38 is pressurized, and the lubricating oil sucked from the oil tank 36 is discharged, and the lubricating oil is supplied to the air-oil mixer 31. is being pumped out. The oil tank 36 is provided with a float switch 44 that detects the level of the lubricating oil and outputs the level to the controller 24.

On the other hand, the controller 24, as shown in FIG.
Microcomputer IO1 drive circuit 20, display circuit 3
0, input circuit 40, power supply circuit 50, air vent switch 6
0 and a reset switch 70. The steps shown in FIGS. 3 to 5 are programmed and built into the microcomputer 10, and the microcomputer 10 operates according to this program. The drive circuit 20 has built-in transistors and relays (not shown), and the transistors are turned on and off according to the output of the microcomputer 10, and the relays are turned on and off accordingly. According to the on/off of this relay, the solenoid switching valve 26 or the solenoid switching valve 42 is turned on/off.
Turn off. The display circuit 30 is for indicating the operating status of the hydraulic circuit, and is made up of an integrated circuit and display elements such as light emitting diodes, and the display elements such as the light emitting diodes are turned on or off according to the output of the microcomputer IO. ing. The input circuit 40 is composed of an integrated circuit such as an inverter or a buffer, and is connected to the first to fourth pressure switches 32, 34, 3
5.41 etc. is transmitted to the microcomputer IO. The air vent switch 60 is used to set the controller 24 in an air vent mode. Note that 45 and 46 are check valves shown in FIG.

Next, the operation of the oil and air lubrication system of the present invention will be described in detail below with reference to FIGS. 3 to 5.

First, in step Sl shown in FIG. 3, the input power is turned on. In step S2, what is the internal state of the microcomputer 10 in the controller 24 and the state of the turnout terminal? J.J.
It becomes jlJi. Next, in step S3, the on/off state of the float switch 44 is checked. This is to check the oil level in the t111 tank 36, and if the float switch 4.1 is off, the oil level is insufficient, so a stop signal is sent to the bearing drive device (not shown) in steps S20 and 30. At the same time, a display element to indicate the lack of oil level is lit. This state is at step S40.
This continues until the reset switch 70 is turned on.

If the float switch 44 is on, the amount of oil in the ura tank 36 is sufficient in step S4, so the electromagnetic switching valve 2 is turned on.
6 is turned on by a signal from the controller 24 and switched to the non-pole position Vl.

The compressed air discharged from the air supply source 21 passes through the air supply path 25 and is supplied to the electromagnetic switching valve 42 and the bearing 22, respectively. Next, in step S5, the third pressure switch 3
The on/off status of 5 is checked. This is to check whether the pressure of the discharged compressed air is appropriate. If the third pressure switch 35 is off, there is insufficient pressure, and a stop signal is sent to the bearing drive device. At the same time, the display element for indicating the lack of pressure is lit. This state continues until the reset switch 70 is turned on. On the other hand, if the third pressure switch 35 is on, the pressure is appropriate and the process proceeds to the next step S6. Here, it is checked whether the air vent switch 60 is on or off. If it is on, the air venting routine 1 shown in FIG. 4 is entered, which will be described later. Air vent switch 60
When is set to the off side, no air is vented and normal operation of the bearing 22 is performed. In step S7, the electromagnetic switching valve 42 is turned on, and the electromagnetic switching valve 42 is switched to the symbol position (2). At the same time that the air-driven pump 38 is activated, a timer T2 that defines the operating time of the electromagnetic switching valve 42 is started. Step S8 and Step S
9, the first pressure switch 32 and the fourth pressure switch 4
1 on/off can be checked. At this time, the air-driven pump 38 is operating and lubricating oil is being discharged. After a while, when the pressure in the oil passage 39 increases, the operation is normal, so the first pressure switch 32 and the fourth pressure switch 41 are turned on. If the first pressure switch 32 and the fourth pressure switch 41 are not turned on, the oil passage 39 or the air supply passage 25 may be clogged, or the air-driven pump 38 may be malfunctioning, so a stop signal is sent to the bearing drive device. At the same time, a display element indicating this reason is lit. This state continues until the beam set switch 70 is turned on. First pressure switch 32 and fourth pressure switch 41
If it is turned on, the operation is normal, so a check is then made in step SlO to see if timer T has timed up. This state continues until the timer 'r times out. When the time is up, step S
ll, the electromagnetic switching valve 42 is turned off and the symbol position V2
Simultaneously with switching from symbol position v3 to symbol position v3, timer 'rl, which defines the rest time of electromagnetic switching valve 42, is started. Next, in step SI2, the first. Fourth pressure horn switch 32. [An audience] to see if l11 is off or not. At this time, since the electromagnetic switching valve 42 has been switched to the symbol position V3 on the rest side, the air-driven pump 38 stops operating and no lubricating oil is discharged into the oil passage 39. Therefore, oil path 3
9 and the air supply path 25 are low, so the first
．． The fourth pressure switch 32.41 is not activated. but,
Rashi 1st. When the fourth pressure switch 32.41 is turned on, the first pressure switch 32.41 is turned on. Since it is possible that the fourth pressure switch 32, 41 has failed, the same measures as described above are taken. On the other hand, the first
．． If the fourth pressure switch 32.41 is off, the process proceeds to step S+3, where the on/off status of the second pressure switch 34 is checked. This is a check to see if air is being supplied normally. If the second pressure switch 34 is off, it is considered that there is an abnormality such as clogging of the air supply path 25, and the same measures as described above are taken. When the second pressure switch 34 is on, everything is normal, so the float switch 44 returns to the check position and the same procedure is repeated.

Next, the above-mentioned air purge routine 1 will be explained.

In the air purge routine 1, when the air purge switch 60 is turned on, the air-driven pump 38 is operated a predetermined number of times so that air purge is completed in a short period of time during which the electromagnetic switching valve 42 normally rests. Air is vented. That is, when the air vent switch 60 of the controller 24 is turned on, the electromagnetic switching valve 42 is turned on in step S51, and the air-driven pump 38 is activated.At the same time, the timer T that defines the operating time of the electromagnetic switching valve 42 is activated.
3 is started. Next, in step S52, a check is made to see if the timer T3 has timed up.
When the time has elapsed, the electromagnetic switching valve 42 is turned off and the timer T4 is started in step S53. Then,
In steps S54 to S57, a counter that counts the number of times the electromagnetic switching valve 42 is operated is incremented by one, and a check is made to see if it has reached a predetermined number of times. When the predetermined number of times has been reached, or when the reset switch 70 is turned on, the air purge routine starts, but if the predetermined number of times has not yet been reached, the timer T4 is checked to see if it has timed up, and when the time has elapsed. returns to the beginning and repeats this routine. In this way, the electromagnetic switching valve 42 is operated a predetermined number of times, and the air-driven pump 38 is driven to discharge residual air present in the oil passage 39 to the outside of the oil passage 39. Even if air gets mixed into the oil passage during repairs, turn on the air vent switch 60 of the controller 24 and the air-driven pump 3 will be automatically removed.
8 is driven a predetermined number of times, the residual air in the path 711j is exhausted to the extent that it can be almost ignored, and after that, the bearing 22
Lubricating oil and compressed air are smoothly supplied to the bearing 22, and the bearing 22 is operated smoothly.

Further, FIG. 5 shows an air venting routine 2 of an embodiment different from the air venting routine 1 of the above embodiment.

In this air purge routine 2, the air-driven pump 38 is operated a predetermined number of times by repeating the rest time and operation time explained in the above embodiment, and instead of performing air purge, the number of times the air-driven pump 38 is driven is not specified, First pressure switch 32
or fourth pressure switch 41 or set switch 7
When any one of 0 is turned on, the air purge operation is stopped.

That is, in step S61, the electromagnetic switching valve 42 is turned on, and the electromagnetic switching valve 42 is switched to the symbol position V2,
Compressed air from the air supply source 21 is supplied to the air-driven pump 38
At the same time, the operation timer T3 starts. In step S62, lubricating oil is supplied to the oil path 39 and the air supply path 25 to increase the pressure, and when the first pressure switch 32 or the fourth pressure switch 41 is turned on or the reset switch 70 is turned on, step S62
At 63, the solenoid switching valve 42 is turned off and the symbol position ■
Switches from symbol position 2 to symbol position ■3. On the other hand, when neither the 1.4th pressure switch 32.41 nor the reset switch 70 is turned on, lubricating oil flows through the oil passage 39.
Since the air is not yet sufficiently supplied to the air supply pipe 25, the process proceeds to step S64, where it is checked whether or not the timer T3 has timed out. If the timer T3 has timed up, the electromagnetic switching valve 42 is turned off in step S65, and the electromagnetic switching valve 42 is at the symbol position (3). At the same time, a pause time timer T4 is started.

In step S66, it is checked whether or not the timer T4 has timed up. If the timer has timed up, the process returns to step S61 and repeats the same operation.

<Effects of the Invention> As is clear from the above description, according to the oil and air lubrication device of the present invention, the controller is provided with an air purge switch for setting the air purge mode, and the operating interval during bearing lubrication is A drive circuit is installed that continuously drives the pump at short intervals according to predetermined conditions, and the air release switch is turned on to automatically remove air remaining in the oil passage. Can be discharged off the road. Therefore, according to the present invention, if air gets mixed into the oil passage during initial operation or during repairs, the air can be easily removed and the bearing can be operated quickly.

[Brief explanation of drawings]

Fig. 1 is a hydraulic circuit diagram of an embodiment of the present invention, Fig. 2 is a block diagram of the controller, Fig. 3 is a sequence diagram of the above embodiment, Fig. 4 is a sequence diagram of the air vent routine 1,
FIG. 5 is a Nokens diagram of a different air purge routine 2, and FIG. 6 is a conventional 411 pressure circuit diagram. 20... Drive circuit, 21... Air supply source, 22
・・Bearing, 24-controller, 31・Air-oil mixer, 36・・oil tank, 38・・pump, 39・
・Oil line, 60・Air vent switch. Patent applicant: Koyo Seiko Co., Ltd. Representative: Patent attorney: Mr. Hao and two others Figure 2, Figure 4, Figure 5

Claims (3)

[Claims] (1) An air supply source that delivers compressed air, a pump that intermittently discharges oil from an oil tank, a controller that controls the pump, the oil discharged from the pump, and the compressed air that is pressure-fed from the air supply source. In an oil and air lubricating system consisting of an air-oil mixer that mixes air and oil and transports the mixture to the bearing, the controller is equipped with an air-bleeding switch for setting the air-bleeding mode, and is activated when the air-bleeding switch is turned on to lubricate the bearing. A drive circuit is provided that continuously drives the pump at intervals shorter than the operating interval during the operation.
The oil and air lubrication is characterized in that when air is vented, the air vent switch is operated and the pump is driven according to preset conditions using a signal from the drive circuit to vent the air remaining in the oil passage. Device. (2) Claim 1, wherein the preset condition is that the pump is driven and stopped a predetermined number of times.
Oil-and-air lubrication system as described in section. (3) The preset conditions are determined by detecting the pressure in the pipe of the oil discharged from the pump and the pressure in the pipe between the bearing and the air-oil mixer, and either of these pressures is set in advance. The oil and air lubricating device according to claim 1, wherein the pump is stopped when the pressure is higher than the pressure.