JPS6372372A - Viscous material emitting apparatus - Google Patents

Abstract

PURPOSE:To easily control emitting quantity by making the residual quantity of a viscous material always constant, by providing the air cut nozzle opened to the inner wall of the emitting port of the viscous material and blowing off air from the nozzle after the finish of the extrusion of the viscous material. CONSTITUTION:A putty material having high specific gravity is used in the correction of unbalance as a viscous material for correction and the viscous material 41 is extruded toward an emitting port 12 by the operation of a pump part 13 for the time proportional to unbalance quantity. When the rotation of a geared motor 16 through a drive circuit 31 is finished, a timer part 33 outputs a signal for operating an air valve 22 to a valve driving circuit 34 after the elapse of a definite short time. The air passing an air pipe 21 and blowing off from an air cut nozzle 11 allows the viscous material accumulated in the emitting port 12 or on the surface thereof to fall and, therefore, the remaining way of the viscous material becomes an almost constant state every time and the accuracy of emitting amount is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a viscous material discharging device for discharging a viscous material such as a putty material for unbalance correction in a fixed amount at a time.

When correcting unbalance, when a predetermined amount of viscous material is ejected using a viscous material discharging device that dispenses a viscous material such as correction putty, some of the viscous material may be ejected. However, it remains without falling from the outlet surface. At times, this viscous material may remain hanging down from the discharge port for a long time, and at other times, it may fall well and not remain hanging down.

This difference in the amount of viscous material that remains without falling means that even when the pump section pumps out the same constant amount, there is a difference in the amount of viscous material that is discharged. In other words, it is an error. In order to reduce the difference and improve the accuracy of the discharge amount, conventionally a method has been adopted in which the radius of the discharge port is made small.

■ becomes 1. As mentioned above, in order to increase the accuracy of the amount of viscous material discharged, it is necessary to reduce the radius of the discharge port. However, in that case, in order to obtain a predetermined discharge amount, the viscous material must be extruded in a thin and long manner, resulting in the inconvenience that it takes a long time to discharge.

The present invention was conceived to solve the above-mentioned disadvantages, and an object of the present invention is to provide a viscous material discharging device that can discharge an accurate amount of viscous material without reducing the radius of the discharge port. .

In order to achieve the above object of η゛, the present invention includes a pump part that pushes out a viscous material, an air cut nozzle that opens in the vicinity of the opening of the inner wall of the discharge port for the viscous material pushed out by the pump part, and a pump part. The viscous material discharge device includes an air valve that sends air to the air cut nozzle after extrusion of the viscous material is completed.

When the pump part pushes out the viscous material from the discharge port and then sends air to the air cut nozzle, the air tends to escape from the discharge port to the outside.

At this time, the viscous material remaining on the side closer to the opening than the air cut nozzle of the discharge port is pushed out together with the outgoing air and falls. As a result, what remains without being pushed out is only the viscous material located on the back side of the air cut nozzle at the discharge port.

Therefore, the amount of viscous material remaining is approximately constant each time, and an amount of viscous material that is more proportional to the amount pushed out by the pump is discharged from the discharge port.

11th Example FIG. 1 is an explanatory diagram showing a schematic diagram of a mechanical part and a block diagram of an electrical configuration of an embodiment of the present invention.

When correcting unbalance, putty material with a large specific gravity is used as a viscous body for correction. The viscous body 41 is housed in the tank part 14, and is composed of a gear pump (the diagram is a schematic diagram, so it does not correspond to the actual shape).
3, the viscous body 41 is sent out and is discharged from the discharge port 12 onto the workpiece 43. Compressed air sent out from the air source 23 passes through the air valve 22 to the air vibrator 21.
Air cut nozzle 1 opens to discharge port 12 through
Blows out from 1.

The unbalance measurement unit 39 is an external device that measures the unbalance of the workpiece 43 and outputs a signal indicating the amount of unbalance, etc. The signal indicating the amount of unbalance is led to the time calculation unit 32, and the pump unit 13 is operated for a predetermined time. is converted into a time signal for Then, it is supplied to the geared motor 16 via the drive circuit 31. In other words, the pump section 13
operates, and the amount of viscous material 411 necessary for correcting the work 43 is
is discharged.

The signal sent from the time calculation section 32 to the timer section 33 is a signal indicating the end of the drive when the geared motor 16 is rotated via the drive circuit 31, and the timer section 33 indicates the end of the drive. When the receiver receives the signal shown, after a certain short time Δ has elapsed, it outputs a signal to the valve drive circuit 34 to operate the air valve 22. Air valve 22
Regarding the function of the compressed air sent to the air cut nozzle 1 through the air vibe 21 when it operates,
A detailed explanation will be given below with reference to FIGS. 2 and 3.

FIG. 2 is a partially cutaway perspective view showing the vicinity of the discharge port 12;
FIG. 3 is a sectional view thereof.

The discharge pipe 17 is gradually narrowed toward the tip, and a disk portion 114 is provided at the tip.

An air travel section 112, which is a donut-shaped cavity, is formed inside this disk section 114.

An air cuff nozzle 11 opens from the air travel section 112 toward an inner wall 121 of the discharge port 12 located at the center thereof.

The air vibe 21 whose one end is connected to the air valve 22 shown in FIG. It is open to the portion 112. In other words, the compressed air from the air passage 211 passes through the air travel section 112 and is discharged from the air cut nozzle 11 through the discharge port 12 to the outside.

The operation of the air blown out from the air cut nozzle 11 will be explained below.

An amount of viscous material 41 corresponding to the amount of unbalance is pushed out from pump section 13 toward discharge port 12 . And pump part 13
, and the delivery of the viscous body 41 is stopped. However, even after the pump section 13 stops operating, a small amount of viscous material 41 remains.
is pushed out from the discharge port 12.

This is because the air bubbles 42 contained in the viscous body 41 are
This is because it is compressed by the delivery pressure during operation, and after the operation stops, it expands in an attempt to return to the original pressure, which is approximately equal to atmospheric pressure. Therefore, air is blown into the air cut nozzle 11 after the short time Δt required for the expansion of the bubbles 42 has elapsed after the pump section 13 has stopped.

The state of the viscous material just before air is blown into the outlet 1
In some cases, most of the liquid on the surface 2 has fallen, and only the part inside the discharge port 12 remains without falling, or even the part hanging down from the surface of the discharge port 12 remains without falling. The amount of viscous material remaining varies. Here air valve 22
When operated to blow air from the air cut nozzle 11, the air flows out in the direction of arrow A, causing the viscous material remaining in the discharge port 12 or on its surface to fall.

The viscous material 41 that remains after being dropped in this way
is only the part located on the back side from the upper surface 114 of the air cut nozzle 11, and the manner in which the viscous material 41 remains remains constant for each circuit. Thereafter, the air valve 22 returns to its original state, air delivery is interrupted, and the operation ends.

Note that the present invention is not limited to the above embodiments, and the viscous body 41 can also be applied to adhesives, clay, etc., for example.

Regarding the air cut nozzle 11, when the radius of the outlet 12 is small, the air pipe 21 can be opened directly into the inner wall 121 of the outlet 12 to form an air cut nozzle as shown in FIG. 4.

Moreover, the pump part 13 is not limited to a gear pump,
Other pumps can be used, such as plunger pumps.

The viscous material discharge device of the present invention is provided with an air cut nozzle that opens on the inner wall of the viscous material discharge port, and air is blown out from the air cut nozzle after the pump section finishes extruding the viscous material. The viscous material that remains without being extruded is only the part of the discharge port on the back side from the air cut nozzle, and the amount of the remaining viscous material is approximately constant. Therefore, it becomes possible to discharge an amount of viscous material that is more proportional to the amount pushed out by the pump section.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a schematic diagram of the mechanical part of an embodiment of the present invention and a block diagram of the electrical configuration,
FIG. 2 is a partially cutaway perspective view showing the discharge port and its vicinity, FIG. 3 is a sectional view of the discharge port, and FIG. 4 is a partial sectional view of another embodiment of the discharge port. DESCRIPTION OF SYMBOLS 11... Air cut nozzle, 12... Discharge port, 13... Pump part, 22... Air valve, 41... Viscous body. Patent applicant Shimadzu Corporation Representative Patent attorney Takaharu Ohnishi Figure 2

Claims (1)

[Claims] (1) A pump part that pushes out the viscous material, an air cut nozzle that is near the opening of the discharge port and opens on the inner wall of the discharge port for the viscous material pushed out by the pump part, and A viscous material discharging device comprising: an air valve that sends air to the air cut nozzle after extrusion is finished.