JP2000085704A - Measuring and discharging device, and discharging method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an irregular mode of application of a discharged resin liquid when the surge pressure is generated when a discharge valve is opened. SOLUTION: A measuring discharge device is provided with a discharge head 16 storing a valve means 30 in which a fluid inlet 20 and a discharge port 22 are formed to open/close them in an alternately switching manner. The discharge head 16 forms a discharge fluid filling space 18 of the volume for a plurality of shots. The space is formed by communicating a cylinder chamber 18B with the head. A discharge rod 40 capable of continuously discharging the filled liquid by one shot unit is inserted in the cylinder chamber 18B to achieve a plurality of shots when a discharge valve is opened one time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metering apparatus and a discharging method, and more particularly to a discharging apparatus and a discharging method suitable for discharging and supplying a viscous fluid such as a resin material or an adhesive.

[0002]

2. Description of the Related Art A discharge device used for measuring and discharging a resin material or the like is generally operated by opening and closing a discharge valve of a material supplied under pressure. FIG. 4 shows an example of the structure of a two-liquid mixing type dispenser provided with such a discharge device. As shown in the figure, a main material tank 1 and a hardener tank 2 are provided, and a metering and discharging device 3 is provided below each of the tanks 1 and 2. The metering and discharging device 3 employs a configuration in which a required amount of resin is measured and extruded by the action of the extruding piston 5 by the piston mechanism 4, the two liquids are mixed by the action of the mixer 5, and the mixture is discharged from the tip discharge nozzle 6. I have. The principle of weighing in this type of dispenser will be described with reference to FIG. The measuring tube 7 into which the pushing piston 5 is inserted is connected to the tank 1 or 2 so that the material resin 9 can be filled in the measuring tube 7. A check valve 8 is provided at the outlet of the measuring tube 7, and by pushing the pushing piston 5 forward from the home position ((1) in FIG. 1), after the piston 5 passes through the communicating portion with the tanks 1 and 2, the internal pressure is reduced. Rises, the check valve 8 is opened, and the discharge is started (FIG. 2B). The discharge is completed when the piston 5 reaches the forward limit (FIG. 3C). The discharge flow rate is controlled by controlling the stroke of the piston 5. After the discharge, the piston 5 is retracted, whereby the inside of the measuring tube 7 is evacuated, and a new material resin 9 is drawn in by opening the communicating portion with the tanks 1 and 2 (FIG. 4 (4)). Then, the piston 5 returns to the home position, and enters the position for the next shot (FIG. 5 (5)).

[0003]

By the way, in the above-mentioned conventional discharge device, the push-out piston 5 is driven one reciprocation for each shot of discharging the material resin 9, so that the check valve 8 is opened for each discharge operation. Therefore, generation of surge pressure due to the valve opening action of the check valve 8 poses a problem.
FIG. 6 (1) shows a characteristic diagram of the discharge pressure and a plan view and a side view of the discharge resin in the conventional apparatus, and FIG. 6 (2) shows a time chart showing the relationship between the discharge signal and the drive signal of the push-out piston 5. ing. As shown in the figure, the discharge signal and the drive signal of the push-out piston 5 correspond one to one, whereby the resin is discharged and the resin is sucked in by one reciprocating movement of the piston 5. As a result, FIG.
Looking at the discharge pressure characteristic shown in (1), there is a surge pressure due to the opening of the check valve 8 at the beginning of the discharge start. As a result, a large amount of resin is discharged at a large pressure only at the initial stage of each shot. There was a drawback that the application form of the discharged resin was disturbed in the initial stage.

The present invention pays attention to the above-mentioned conventional problems, and when a fluid such as resin is measured and discharged, the discharged fluid can be discharged under a stable pressure. It is an object of the present invention to provide a metering and discharging apparatus and a discharging method which can be finished to a desired level.

[0005]

In order to achieve the above object, a metering / discharging apparatus according to the present invention has a discharge head containing a valve which forms a fluid introduction port and a discharge port and alternately opens and closes them. A discharge fluid filling space for a plurality of shots is formed in the discharge head, and the discharge head is provided with discharge means capable of continuously extruding the fill fluid in one shot unit. In this case, the discharge fluid filling space is formed by a discharge head main body internal space and a cylinder communicating with the discharge head main body, and a discharge rod forming the discharge means is provided in the cylinder, and the discharge rod is moved by a stroke in units of one shot. It should be possible.

Further, according to the discharge method of the present invention, a fluid introduction port and a fluid discharge port opened in a discharge head are alternately opened and closed, and when the fluid introduction port is opened, a discharge target fluid is provided for a plurality of shots. The suction head is collectively suction-filled, and when the fluid discharge port is opened, the discharge rod facing the discharge head is stroke-moved in units of one shot, thereby discharging the filling fluid from the discharge port in units of one shot. It was made.

[0007]

According to the above construction, the ejection fluid is sucked into the ejection head for several shots at a time, and the ejection rod constituting the ejection means is stroked in units of one shot in a state where the ejection port of the ejection head is opened. Move. As a result, the discharge is performed at every stroke of the rod movement. At that time, the check valve does not open and close, so that no surge pressure is generated, and thus the discharge is performed at the desired discharge pressure. Thus, for example, in the case of applying an adhesive or a sealing resin, the application form can be a desired and accurate form, and occurrence of an irregular application form can be prevented.
Further, the discharge rod can be slightly retracted after one stroke to give an operation for preventing dripping.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a specific embodiment in which a metering and discharging apparatus and a discharging method according to the present invention are applied to a two-liquid mixing type dispenser will be described in detail with reference to the drawings. FIG. 2 is a side view of a two-liquid mixing type dispenser.
2, the main agent and the curing agent are metered and supplied, and the mixture is discharged toward the workpiece in a mixed state. A metering / discharging device 14 is provided for each fluid, in which several shots are collectively sucked into a discharge head into which a material is introduced,
With the discharge port of the discharge head open,
By moving the stroke in shot units, the fluid is discharged and fed to the mixing head 12 in units of one shot.

The specific structure of the metering and discharging device 14 will be described in detail with reference to FIG. This device 14 has a discharge head 16 installed in an upright state, and forms a fluid filling space 18 therein. A fluid inlet 20 for introducing a material to be ejected from the tank is formed on the upper side of the head 16, and a fluid outlet 22 is formed on the lower side. A sub-head 24 is attached to the upper part of the discharge head 16, and a sub-chamber 26 communicating with the fluid filling space 18 via the fluid introduction port 20 is formed in the sub-head 24. I am trying to introduce. For this reason, a socket 28 connected to the fluid pipe is opened on the side wall of the sub head 24.

The discharge head 16 is provided with the fluid inlet 2.
Valve means 3 for alternately switching and opening and closing 0 and discharge port 22
0 is attached. This includes a valve body 32 inserted in the fluid filling space 18 and a valve rod 34 integrally connected to the upper end and extending into the sub-chamber 26.
This is vertically operated by a valve opening / closing solenoid valve 36 provided at the upper end of the sub head 24. Fluid filling space 1 between the fluid inlet 20 and the outlet 22
The opening edge on the side of the valve 8 constitutes a valve seat. The valve body 32 rises and closes the fluid introduction port 20 to stop the introduction of the fluid and enter the discharge mode. The discharge mode is stopped by closing the outlet 22, and the fluid filling mode is entered.

The fluid filling space 18 in which the valve body 32 is inserted is formed so as to be able to fill a plurality of shots of fluid at one time. For this reason, the cylinder head 38 is connected to the side wall of the discharge head 16 and the main body internal space 18A is formed.
A volume for a plurality of shots is secured by the cylinder chamber 18B communicating with the cylinder chamber 18B. A discharge rod 40 forming the discharge means is inserted into the cylinder chamber 18B, and the discharge rod 40 is configured to be able to move in strokes in units of one shot. That is, the servomotor 42 is installed below the ejection head 16 and the servomotor 4
2 is provided with a telescopic movement mechanism 44 that can move in parallel with the discharge rod 40, and an output shaft 46 of the telescopic movement mechanism 44 is provided.
Is connected to the rear end of the discharge rod 40. An arbitrary stroke amount can be given to the discharge rod 40 by the servomotor 42, and a prescribed flow rate can be discharged accurately by stroke management corresponding to one set shot.

The operation of the metering and discharging device 14 is as follows. The valve body 3 by the valve opening / closing solenoid valve 36
2 is lowered to close the discharge port 22 and enter the fluid filling mode, and then the discharge rod 40 is retracted by the operation of the servomotor 42. The retraction stroke amount of the discharge rod 40 is, for example, 10 mm for a stroke corresponding to one shot.
, A retreat of 40 mm is performed for four shots. Thus, four shots of the fluid resin are sucked into the fluid filling space 18 of the ejection head 16 at one time.

Thereafter, the valve body 32 is raised by the valve opening / closing solenoid valve 36 to enter the discharge mode. Next, based on the discharge signal, the servo motor 42 is driven to advance the discharge rod 40 by a stroke amount equivalent to one shot, and a predetermined resin fluid is discharged from the discharge port 22. This operation is intermittently repeated for four shots to perform ejection.

FIG. 3A shows the characteristic diagram of the discharge pressure and the form of the applied resin, and FIG. 3B shows the time of the discharge signal, the open / close signal of the valve opening / closing solenoid valve 36, and the operation signal of the discharge servomotor 42. The chart is shown. As shown in these figures, a plurality of shots are intermittently performed by the servomotor 42 while the valve opening / closing solenoid valve 36 opens the discharge port 22. During this shot, the opening / closing valve means 30 opens and closes. do not do. Thus, as can be understood from FIG. 3A, it is understood that no surge pressure is generated in the discharge pressure, and that the applied form of the discharged resin does not have a distorted bulge at the tip.

In the above-described embodiment, the discharge rod 40 is only advanced intermittently in the discharge mode. However, when the discharge fluid has high fluidity, there is a problem of liquid dripping. In such a case, it is possible to perform an operation of slightly retreating after a forward stroke of one shot to prevent dripping due to so-called suction back. Servo motor 42
, The stroke adjustment can be arbitrarily and easily performed.

[0016]

As described above, according to the present invention, the fluid introduction port and the fluid ejection port opened in the ejection head are alternately opened and closed, and a plurality of shots of the fluid to be ejected are made when the fluid introduction port is opened. The discharge fluid is suction-filled into the discharge head at a time, and when the fluid discharge port is opened, the discharge rod facing the discharge head is stroke-moved in units of one shot to discharge the filling fluid from the discharge port in units of one shot. With this configuration, the on-off valve does not need to be opened each time discharge is performed, thereby suppressing generation of a surge pressure due to the valve opening operation, and thereby discharging the discharge fluid at a stable pressure. The application form of the discharge fluid can be beautifully finished.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a metering and discharging device according to an embodiment.

FIG. 2 is a side view of a two-liquid mixing dispenser provided with the metering / dispensing device.

FIG. 3 is a characteristic diagram of a discharge pressure of the discharge device according to the embodiment and a form of a coating resin, and a time chart of a discharge signal, an opening / closing signal of a valve opening / closing solenoid valve, and an operation signal of a discharge servomotor.

FIG. 4 is an explanatory perspective view of a conventional two-liquid mixing dispenser.

FIG. 5 is an operation explanatory view of a conventional metering and discharging device.

FIG. 6 is a characteristic diagram of a discharge pressure of a conventional metering discharge device, a diagram of a form of a coating resin, and a time chart of a discharge signal and a piston drive signal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Device frame 12 Mixing head 14 Metering discharge device 16 Discharge head 18 Fluid filling space 18A Main body internal space 18B Cylinder chamber 20 Fluid introduction port 22 Fluid discharge port 24 Subhead 26 Subchamber 28 Socket 30 Valve means 32 Valve body 34 Valve rod 36 Valve Opening / closing solenoid valve 38 Cylinder head 40 Discharge rod 42 Servo motor 44 Telescopic movement mechanism 46 Output shaft

Claims (3)

[Claims] 1. A discharge head containing a valve that forms a fluid introduction port and a discharge port and alternately opens and closes the discharge head, wherein a discharge fluid filling space for a plurality of shots is formed in the discharge head. A metering / discharging apparatus characterized in that the head is provided with discharging means capable of continuously extruding the filling fluid in one shot units. 2. The discharge fluid filling space is formed by a discharge head main body internal space and a cylinder chamber communicating with the discharge head main body, and a discharge rod forming the discharge means is provided in the cylinder chamber. The metering and discharging device is characterized in that the stroke can be moved. 3. A fluid introduction port and a fluid ejection port opened in the ejection head are alternately opened and closed, and when the fluid introduction port is opened, a plurality of shots of a fluid to be ejected are collectively suction-filled into the ejection head. A discharge rod for discharging the filling fluid from the discharge port for each shot by moving the discharge rod facing the discharge head in a stroke unit when the fluid discharge port is opened. .