JPH10272409A - Dispensing device - Google Patents

Abstract

(57) Abstract: An object of the present invention is to provide a fixed-quantity discharge device capable of reducing a syringe exchange as much as possible and obtaining a stable discharge amount. A hollow cylindrical main body (12) containing a material to be discharged at a constant rate, and a discharge port (13) provided at a lower end of the main body.
A first syringe 1 having a piston 14 capable of moving up and down in a liquid-tight manner within the main body, and a ventilation passage 15 connected to an upper end of the main body and capable of introducing a negative pressure or a positive pressure.
1, a hollow cylindrical main body 21 in which the above-mentioned material is to be stored, a discharge port 22 provided at the lower end of the main body, a piston 23 which can move up and down in a liquid-tight manner within the main body, Passage 24 which is connected to the upper end of the
An auxiliary second syringe 20 having: a conduction pipe 30 for connecting the space below the piston in the main body of the first syringe with the discharge port of the second syringe; and a valve 31 for opening and closing the conduction pipe. , The fixed-quantity discharge device 10 is configured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixed-quantity discharge device which repeatedly discharges a predetermined amount of a viscous material such as a cream solder or an adhesive.

[0002]

2. Description of the Related Art Conventionally, such a fixed-rate discharge device has, for example, a hollow cylindrical main body for accommodating a material to be discharged at a fixed amount, a discharge port provided at a lower end of the main body, and a liquid-tight inside the main body. It is configured by using a syringe having a piston that can move up and down and an air passage that is connected to the upper end inside the main body and that can introduce a positive pressure.

According to such a metering device, a material to be metered, for example, a viscous material such as a cream solder or an adhesive, is first stored under the piston in the main body. Then, the positive pressure introduced through the ventilation path increases the pressure in the space above the piston in the main body, thereby lowering the piston. Is discharged downward from the discharge port. Here, by appropriately controlling the positive pressure introduced through the air passage, the amount of downward movement of the piston each time is adjusted, and a predetermined amount of material can be discharged.

[0004]

However, in the fixed-quantity discharge device having such a configuration, the capacity of the syringe is relatively small, for example, about 30 cc. It is necessary to replace the syringe with a new syringe filled with, and the production line must be stopped at the time of replacing the syringe, which causes a problem that productivity is reduced.

Further, every time the material in the syringe is discharged,
Since the space capacity in the syringe increases, it is difficult to maintain a constant discharge amount of the material from the syringe due to the positive pressure introduced through the ventilation path, and it is possible to obtain a stable constant discharge amount. There was a problem that it was virtually impossible.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a constant-rate discharge device capable of reducing syringe replacement as much as possible and obtaining a stable discharge amount.

[0007]

According to the present invention, there is provided a hollow cylindrical main body for accommodating a material to be dispensed at a constant rate, for example, a viscous material such as a cream solder, an adhesive, and the like. A discharge port provided, a piston that can move up and down in a liquid-tight manner within the main body, and a ventilation path connected to the upper end inside the main body and through which a negative pressure or a positive pressure can be introduced; A syringe, similarly, a hollow cylindrical main body in which the above-mentioned material is to be stored, a discharge port provided at the lower end of the main body, a piston capable of moving up and down in a liquid-tight manner within the main body, and a top end inside the main body. An air passage connected and capable of introducing a positive pressure;
An auxiliary second syringe having: a conduit connecting the space below the piston in the main body of the first syringe with the discharge port of the second syringe; and a valve for opening and closing the conduit. This is achieved by a quantitative discharge device characterized in that:

[0008] The metering device according to the present invention is preferably provided with a position detecting sensor for detecting upper and lower limit positions of a piston of the first syringe, and based on a detection signal of the position detecting sensor, a second sensor is provided. Upon delivery of material from the first syringe to the first syringe, the valve is opened.

According to the above construction, the positive pressure introduced into the first syringe through the air passage lowers the piston, whereby the material in the first syringe is discharged from the discharge port and the valve is opened. By opening the conduit, the material can be refilled from the second syringe into the first syringe.

[0010] Therefore, by making the capacity of the second syringe sufficiently large compared to the capacity of the first syringe, the material in the first syringe is discharged from the second syringe after the material in the first syringe is discharged. The first syringe is refilled with material.
Thus, when the material in the first syringe runs out, as in the conventional case, there is no need to replace it with a new syringe filled with the material, and the first syringe is used until the material in the second syringe runs out. Can be continuously performed. Thus, when the present fixed-quantity discharge device is used by being incorporated into a production line, the production line needs to be stopped relatively little, and productivity can be improved.

[0011] Further, if the material is replenished from the second syringe to the first syringe after a predetermined number of material discharges from the first syringe, the first syringe during material discharge from the first syringe can be refilled. The volume of material in the syringe will always be kept within a certain range. Therefore, since the various conditions in the first syringe are substantially constant, an accurate discharge amount can be easily adjusted by controlling the positive pressure introduced into the first syringe from the ventilation path. Thus, a stable discharge amount can be realized.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. FIG. 1 shows an embodiment of the constant-rate discharge device according to the present invention. In FIG. 1, a fixed-rate discharge device 10 is for discharging a predetermined amount of an adhesive, for example, in a production line, and two syringes connected in succession, that is, a first syringe 11 for discharging and , A second syringe 20 for replenishment, and a conduit 3 for connecting the first syringe 11 and the second syringe 20.
0 and are included.

The first syringe 11 has a hollow cylindrical main body 12 for accommodating a material to be discharged at a constant rate, a discharge port 13 provided at a lower end of the main body, and a vertically movable liquid-tight inside the main body. It has a piston 14 and an air passage 15 connected to the upper end inside the main body and through which a negative pressure via a negative pressure valve or a positive pressure via a discharge valve can be selectively introduced, respectively. The capacity is selected to be, for example, 30 cc as in the case of a conventional syringe for constant-rate discharge.

Here, the first syringe 11 is attached to the main body 12.
Is closed in a liquid-tight manner by a cap 15a formed integrally with one end of the ventilation path 15,
A conduction tube portion 15b is provided to extend downward from the upper side of the cap 15a through the cap 15a. The conducting tube portion 15b further penetrates the piston 14 in the main body 12, extends below the piston 14, and liquid-tightly defines a space above and below the piston 14 when the piston 14 moves up and down. It has become.

Further, the first syringe 11 is provided with two position detection sensors 16 and 17 for detecting an upper limit position and a lower limit position in one discharge of the piston 14 outside the main body 12 thereof. . This position detection sensor 1
Reference numerals 6 and 17 denote proximity sensors having an arbitrary configuration. For example, coils connected to an oscillation circuit (not shown) are provided based on an oscillation signal from the oscillation circuit when metal embedded in the piston 14 approaches. Thus, the approach of the piston 14 can be detected.

The second syringe 20 has the same configuration as the first syringe 11, and has a hollow cylindrical main body 21 in which the above-mentioned material is to be accommodated, and a discharge port 22 provided at the lower end of the main body. , Piston 2 that can move up and down liquid-tight within the body
3 and an air passage 24 connected to the upper end of the inside of the main body and through which a positive pressure can be introduced via a replenishing valve, the capacity of which is sufficient compared to the capacity of the first syringe 20. Large, for example, 500 cc is selected. here,
The upper end of the main body 21 of the second syringe 20 is liquid-tightly closed by a cap 24a formed integrally with one end of the ventilation path 24.

Further, the discharge port 22 of the second syringe 20 is connected to the upper end of the conduction pipe portion 15b of the first syringe 11 via a rubber tube 25. As a result, the conductive tube portion 15b and the rubber tube 25 allow the conductive tube 30 to communicate the space below the piston 23 of the second syringe 20 with the space below the piston 14 of the first syringe 11.
Will be constituted. The rubber tube 25 has an openable / closable valve 31, for example, a mechanical valve, at an intermediate portion thereof.

A fixed-quantity discharge device 10 according to an embodiment of the present invention.
Is configured as described above, and the operation in the case of material ejection will be described with reference to the time chart of FIG. First, a sufficient amount of adhesive is charged in the first syringe 11, the piston 14 is at the upper limit position corresponding to the position detection sensor 16, and the position detection sensor 16 is turned on. On the other hand, as for the second syringe 20, the replenishment valve for introducing the positive pressure into the ventilation path 24 to the second syringe 20 is closed, and the mechanical valve 31 is also closed.

From this state, a discharge valve for introducing a positive pressure into the ventilation path 15 to the first syringe 11 is opened for a predetermined time at predetermined time intervals corresponding to the production line. As a result, as shown in FIG. 3, a positive pressure is introduced into the internal space above the piston 14 of the first syringe 11 by opening the discharge valve, and based on this positive pressure, the piston 14 moves downward. Move. Therefore,
The adhesive filling the internal space below the piston 14 is pushed downward from the discharge port 13. In this case, by appropriately controlling the opening time of the discharge valve, a fixed amount of the adhesive can be discharged.

Then, for example, the adhesive is discharged three times, the volume of the adhesive in the first syringe 11 is reduced, and the piston 14 is moved to the lower limit position corresponding to the lower position detecting sensor 17. When it reaches (see FIG. 4), the position detection sensor 17 is turned on. This position detection sensor 17
Is turned on, the device origin signal is turned on, the replenishment valve for introducing a positive pressure into the air passage 24 to the second syringe 20 and the mechanical valve 31 are opened, and the first syringe 11 is opened. A negative pressure valve for introducing a negative pressure into the air passage 15 is opened (see FIG. 5).

Accordingly, as shown in FIG. 5, a positive pressure is introduced into the internal space above the piston 23 of the second syringe 20 by opening the replenishing valve, and the piston 23 is moved based on the positive pressure. Move down. Therefore,
The adhesive filling the internal space below the piston 23 is delivered from the discharge port 22 to the internal space below the piston 14 of the first syringe 11 via the conduit 30, and the first syringe The refill of the adhesive in 11 will be performed (see FIG. 6). At this time, the first syringe 1
A negative pressure is introduced into the internal space above the first piston 14 by opening the negative pressure valve, and based on this negative pressure, the piston 14 moves upward as shown in FIG. Thus, the adhesive can be smoothly refilled from the second syringe 20 into the internal space below the piston 14 of the first syringe 11.

When the replenishment of the adhesive is performed and the piston 14 of the first syringe 11 reaches the upper limit position, the upper position detection sensor 16 is turned on, whereby the replenishment valve and the mechanical valve 31 and the negative valve The pressure valve is closed, and the refilling of the adhesive into the first syringe 11 is completed. Thereafter, the apparatus origin signal is turned on, the discharge valve for introducing the positive pressure to the first syringe 11 is opened again, and the adhesive is discharged from the discharge port 13 of the first syringe 11. Become.

Thus, the discharge of a predetermined amount of the adhesive by the first syringe 11 can be performed by controlling the opening of the discharge valve, and the piston 14 of the first syringe 11 is moved between the upper limit position and the lower limit position. As described above, since the adhesive is replenished from the second syringe 20, the capacity of the adhesive in the first syringe 11 is always maintained within a certain range. Therefore, a stable predetermined amount of ejection can be performed.

In the above-described embodiment, a case has been described in which the position detection sensors 16 and 17 use proximity sensors to which an oscillation circuit is applied as an example. However, the present invention is not limited to this. For example, a reed switch that detects a magnet embedded in the piston 14 may be used.

In the above-described embodiment, the discharge port 22 of the second syringe 20 is connected to the upper end of the first syringe 11 through the conduction pipe 30 penetrating the piston 14.
The first syringe 11 is delivered below the piston 14, but is not limited thereto.
Obviously, the zero discharge port 22 may be directly connected to the lower region of the first syringe 11.

[0026]

As described above, according to the present invention, the positive pressure introduced into the first syringe through the air passage lowers the piston, and discharges the material in the first syringe. Discharged from the outlet and the valve opening the conduit allows material to be replenished from the second syringe into the first syringe.

Therefore, by making the capacity of the second syringe sufficiently large as compared with the capacity of the first syringe, the material in the first syringe is discharged from the second syringe after the material in the first syringe is discharged. The first syringe is refilled with material.
Thus, when the material in the first syringe runs out, as in the conventional case, there is no need to replace it with a new syringe filled with the material, and the first syringe is used until the material in the second syringe runs out. Can be continuously performed. Thus, when the present fixed-quantity discharge device is used by being incorporated into a production line, the production line needs to be stopped relatively little, and productivity can be improved.

Further, if the material is replenished from the second syringe to the first syringe after the material is discharged from the first syringe a predetermined number of times, the first syringe in discharging the material from the first syringe can be obtained. The volume of material in the syringe will always be kept within a certain range. Therefore, since the various conditions in the first syringe are substantially constant, an accurate discharge amount can be easily adjusted by controlling the positive pressure introduced into the first syringe from the ventilation path. Thus, a stable discharge amount can be realized.

Thus, according to the present invention, it is possible to provide an extremely excellent fixed-quantity discharge apparatus capable of reducing a syringe exchange as much as possible and obtaining a stable discharge amount.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing a configuration of an embodiment of a fixed-quantity ejection device according to the present invention.

FIG. 2 is a time chart showing the operation of each unit of the fixed-quantity discharge device of FIG.

FIG. 3 is a schematic cross-sectional view showing a state at the time of starting discharge of an adhesive in the constant-rate discharge device of FIG. 1;

FIG. 4 is a schematic cross-sectional view showing a state in which the adhesive is being discharged in the constant-rate discharging device of FIG. 1;

FIG. 5 is a schematic cross-sectional view showing a state at the time of starting refilling of the adhesive in the constant-rate discharge device of FIG. 1;

FIG. 6 is a schematic sectional view showing a state in which the adhesive is being replenished in the constant-rate discharge device of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Fixed amount discharge apparatus 11 1st syringe 12, 21 Main body 13, 22 Discharge port 14, 23 Piston 15, 24 Vent path 15a, 24a Cap 15b Conductive pipe part (conductive pipe) 16 Position detection sensor (upper) 17 Position detection sensor (Downward) 20 second syringe 25 rubber tube (conduction tube) 30 conduction tube 31 mechanical valve

Claims (3)

[Claims] 1. A hollow cylindrical main body for accommodating a material to be discharged at a constant rate, a discharge port provided at a lower end of the main body, a piston capable of moving up and down liquid-tight within the main body, and an upper end inside the main body. A first syringe for discharge having a ventilation passage connected to the main body and through which a negative pressure or a positive pressure can be introduced; a hollow cylindrical main body in which the material is to be accommodated; and a lower end provided in the main body. An auxiliary second syringe having a discharge port provided, a piston movable up and down in a liquid-tight manner in the main body, and an air passage connected to an upper end inside the main body and through which a positive pressure can be introduced; A discharge pipe for connecting a discharge space of the second syringe to a space below the piston in the body of the syringe, and a valve for opening and closing the discharge pipe. 2. The constant-rate discharging device according to claim 1, wherein the material to be discharged at a constant rate is a viscous material such as cream solder or an adhesive. 3. A position detecting sensor for detecting upper and lower limit positions of a piston of the first syringe is provided, and based on a detection signal of the position detecting sensor, a signal from the second syringe to the first syringe is provided. 2. The apparatus according to claim 1, wherein the valve is opened when the material is delivered.