JPS5811013B2 - Semi-liquid pouring amount confirmation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for checking the amount of semi-liquid material poured out in a device for dispensing semi-liquid materials such as grease.

Conventionally, as this type of semi-fluid liquid dispensing device, for example, the first
There are some as shown in Fig. 2 and Fig. 2.

However, this device does not have a means for checking the air contained in the semi-liquid measuring cylinder 8, and therefore has the disadvantage that it is not possible to dispense an accurate amount of the semi-liquid.

That is, in order to pour out a certain amount of semi-fluid material, such as grease G, from the nozzle 2 using this semi-fluid material dispensing device 1, as shown in FIG. At the same time, the solenoid valve 4 is switched to send grease G from the grease tank 5 into the measuring cylinder 8 using the grease pump 6, and the piston rod 8A of the measuring cylinder 8 is moved in the direction of the arrow X.

Then, the dog 9 provided on the piston rod 8A operates the limit switch LS1.

Then, as shown in FIG. 2, the solenoid valves 4, 1
0 is switched, and the solenoid valve 10 is switched, so that the fluid pressure-driven valve 3 is switched and the metering cylinder 8 is switched.
is operated in the direction of arrow X2, and a measured amount of grease is poured out from the nozzle 2.

Note that LS2 is a limit switch provided to confirm the completion of extrusion of the measuring cylinder 8 and switch the solenoid valves 4 and 10 to return the piston of the measuring cylinder to the state shown in FIG. This is an oil pump installed at T and connected to the solenoid valves 4 and 10.

However, in such a semi-fluid material dispensing device, the grease G pumped by the grease pump 6 is put into the measuring cylinder 8, and the grease is injected into the machinery by moving the piston of the measuring cylinder 8. Therefore, if air K is mixed in with grease G as shown in FIG. There was a problem in that the amount of grease G poured out to the machinery was insufficient.

This invention was made by focusing on such conventional problems, and its purpose is to solve the problem when air is mixed in a semi-liquid substance such as grease filled in a measuring cylinder. The system uses the compressibility of air to check the dispensed amount, and its feature is that when the dispensing side of the semi-liquid filled in the measuring cylinder is closed and the piston is pushed toward the dispensing side, The present invention is characterized in that means is provided for detecting whether the piston rod moves by a predetermined amount depending on the amount of air mixed in.

The present invention will be explained below based on the drawings.

3 to 6 show an embodiment in which the present invention is applied to a dispensing device having an automatic circuit.

In each figure, 11 is a pouring amount confirmation device according to the present invention, and a measuring cylinder 12 that can be filled with a certain amount of grease G, etc.
A measuring cylinder device 17 comprising a first dog 13 and a second dog 14 provided on the piston rod 12A, a first limit switch 15 actuated by the first dog 13, and a second limit switch 16 actuated by the second dog 14; A piston rod 12A corresponding to the amount of compression of the air contained in the grease G is provided on the piston rod 12A at a certain distance from the first limit switch 15 in the compression direction of the piston rod 12A.
and an air detection limit switch 18 as means for detecting the movement of the air.

An oil intake/discharge port 12a provided at the end of the measuring cylinder 12 is connected to an oil pump 21 provided in an oil tank 20 via a solenoid valve 19, and a grease intake/discharge port 12b provided at the other end of the measuring cylinder 12 is hydraulically driven. It is connected to a grease pump 23 via a valve 22.

An oil suction/discharge port 24a at one end and an oil suction/discharge port 24b at the other end of a hydraulic cylinder 24 for switching the hydraulically driven valve 22 are connected to the oil pump 21 via a solenoid valve 25, respectively.

26 is a nozzle for dispensing grease G, and this nozzle 26 is connected to the hydraulically driven valve 22 via a stop valve 27 and a shut-off solenoid valve 28.

29 is a drain valve attached to a branch pipe branched from the pipe between the stop valve 27 and the shut-off solenoid valve 28; 30 is an air detection bell; this detection bell 30 is connected via the AND circuit 31 as described above. It is electrically connected to the shut-off solenoid valve 28 and the air detection limit switch 18, so that the detection bell 30 issues an alarm only when the shut-off solenoid valve 28 is open and the limit switch 18 is activated. .

23A is a grease tank. Next, the operation of the embodiment will be explained based on the diagonal configuration.

Now, as shown in FIG. 3, when the solenoid valve 25 is switched to position 25A, oil O from the oil tank 20 is supplied by the oil pump 21 into the hydraulic cylinder 24 of the hydraulically driven valve 22, and the piston is moved to the arrow 24Y1. move in the direction.

Then, the hydraulically driven valve 22 is switched to position 22A, and grease G is supplied into the metering cylinder 12 by the grease pump 23 from the grease tank 23A.

As a result, the piston rod 12 of the metering cylinder 12
A moves in the direction of arrow 12X1, a certain amount of grease G is filled into the measuring cylinder 12, and the first limit switch 15 is activated by the first dog 13 provided on the piston rod 12A.

At this time, the solenoid valve 19 is in position 19A by the spring S, and the oil in the chamber on the left side of the metering cylinder 12 is drained into the oil tank 20.

Next, the fourth limit switch 15 is activated.
As shown in the figure, the solenoid valve 25 is in position 25.
At B, the shutoff solenoid valve 28 is switched to position 28B, and this switching of position 28B causes oil O to be introduced into the hydraulic cylinder 24 of the hydraulically driven valve 22 from its upper oil intake/discharge port 24a, causing the piston to move in the arrow direction. Since it is moved in the 24Y2 direction, valve 2
2 switches to position 22B.

Further, the solenoid valve 19 is operated with an appropriate time delay from the operating wave of the limit switch 15, as shown in FIG. to pump.

Here, if the grease G in the measuring cylinder 12 contains more than the allowable amount of air K, the compressibility of the air K causes the piston rod 12A to move in the direction of the arrow 12X2, and the first dog 13 engages with the air detection limit switch 18, activating it.

By operating this limit switch 18, grease G
It was confirmed that more than the allowable amount of air K was mixed in.

This confirmation signal m and a signal n generated when the solenoid valve 28 is closed can be detected by a detection bell 30 connected via an AND circuit 31.

In other words, if the AND circuit 31 is set so that the detection bell 30 issues an alarm only when the solenoid valve 28 is in the closed state, that is, in the position 28B, and the limit switch 18 is activated, it is possible to detect that air K is mixed in more than the allowable amount. can be notified by sound.

Then, the oil pump 21 is stopped by the signal g from the output terminal of the AND circuit 31, and the shut-off solenoid valve 28 is switched to the position 28A.

Then, the power is turned off, the stop valve 27 is closed, the drain valve 29 is opened, and the piston rod 12A of the metering cylinder 12 is pushed in the 12X2 direction by manual operation, and the grease G mixed with the air K is poured into the drain valve 29.
The grease G mixed with the air K is completely removed from the measuring cylinder 12 by being discharged to the outside.

After removing the grease in this way, the measuring cylinder 12
By keeping the grease flow path from the drain valve 29 to the drain valve 29 relatively short, the grease G
It will be filled with.

After that, close the drain valve 29 again, open the stop valve 27, and turn on the power again solenoid valve 25.
By switching the hydraulically driven valve 22 to position 25A, the solenoid valve 19 is also switched to position 19A as shown in FIG.
Switch to .

Then, as shown in FIG. 3, the piston rod 12A moves in the direction of arrow 12X1 again, grease G is filled into the measuring cylinder 12, and when the first dog 13 engages with the limit switch 15, it is activated. do.

By the operation of this limit switch 15, the solenoid valve 19 is switched to position 19B, and oil O at a constant pressure is forced into the metering cylinder 12, and the piston rod 12A is moved in the arrow 12X2 direction as shown in FIG. try to make it happen.

At this time, if the grease G does not contain air K, the grease G is incompressible, so the piston rod 1
2A cannot move in the arrow 12X2 direction, so the air detection limit switch 18 will not operate.

Therefore, for example, if the limit switch 18 is not activated even after a predetermined period of time has passed after the limit switch 15 is activated, a "no air" confirmation signal is given to the shut-off solenoid valve 28, thereby shifting the shut-off solenoid valve 28 to position 28A. Switch.

Then, the piston rod 12A moves in the direction of the arrow 12X2, and the grease G, which does not contain any air K, which has been metered into the metering cylinder 12, is poured out from the nozzle 26.

(See Figure 6) When the piston rod 12A of the metering cylinder 12 moves in the arrow 12X2 direction as described above, the first dog 15 engages with the air detection limit switch 18 and momentarily activates it. However, when the shut-off solenoid valve 28 is in position 28A, the signal n is not emitted from the valve 28 to the AND circuit 31, so there is no output g from the AND circuit 31.
Therefore, even if the limit switch 18 is momentarily activated, the detection bell 30 will not issue an alarm, and the operation of the oil pump 21 will not stop.

Then, when all the grease G in the measuring cylinder 12 is poured out from the nozzle 26, that is, at the end of the stroke of the piston rod 12A, the second dog 16 provided on the piston rod 12A operates the second limit switch 16, as shown in FIG. let

Therefore, the solenoid valve 19 is in position 19A,
Solenoid valve 25 switches to position 25A and returns to the original state shown in FIG.

Then, by repeating such operations, a fixed amount of grease G that does not contain air K is continuously poured out to the machinery.

As explained above, according to the present invention, the measuring cylinder device is equipped with means for detecting whether or not the piston rod has moved a predetermined amount depending on the amount of air mixed in. It is possible to easily check whether there is an excess or deficiency in the amount of semi-liquid material poured out due to mixed air.
As a result, if the amount to be dispensed is insufficient, it is possible to take measures such as issuing an alarm, so it is possible to prevent a situation in which the amount actually dispensed to machinery is insufficient.

[Brief explanation of drawings]

Figs. 1 and 2 are circuit diagrams of a conventional semi-liquid dispensing device, and Figs. 3 to 6 show an embodiment in which the semi-liquid dispensing amount confirmation device according to the present invention is incorporated into an automatic circuit. An example circuit diagram is shown, respectively. 11... Pour amount confirmation device, 12... Measuring cylinder, 12A... Piston rod, 13...
...1st dog, 14; ...2nd dog, 15
・・・・・・1st limit switch, 16・・・・・・
2nd limit switch, 17...Measuring cylinder device, 18...Air detection limit switch.

Claims (1)

[Claims] 1. A measuring cylinder device configured to pour out the semi-liquid material measured by a measuring cylinder to the outside by pushing the semi-liquid material to the dispensing side with a piston of the measuring cylinder,
Whether or not the piston rod of the measuring cylinder moves a predetermined amount depending on the amount of air mixed in when the dispensing side of the measuring cylinder that weighs a semi-fluid object is closed and the piston is pressed toward the dispensing side. A device for confirming the amount of a semi-liquid poured out, characterized in that it is equipped with a means for detecting the amount of a semi-liquid.