JPH04154502A - Device for filling liquid - Google Patents

Abstract

PURPOSE:To perform filling operation with high accuracy by, after a liquid has been injected into a container by means of an injection means such as a dispenser, etc., sucking the liquid by a sucking means under negative pressure to bring the liquid level in the container to a level of predetermined height. CONSTITUTION:Containers 12 spaced at proper intervals are intermittently conveyed in a direction as indicated by an arrow by means of a conveyor means 10. A molten resin 14 is injected from a needle pipe 17 into the container 12 positioned below a syringe 16. The quantity of injection at this moment is made slightly larger than a required quantity. As a result, the resin 14 stand up above the rim of the container 12 and the container is brought to a position below a sucking vessel 18 by means of the means 10. The vessel 18 is moved vertically by a drive device 26 through an arm 28 within a range of height adjusted by an adjustment pin 30 and when a needle pipe 19 at the lower end of the vessel 18 is lowered and the arm 28 makes contact with the upper end of the pin 30, the resin 14 above the rim of the container 12 is sucked through the pipe 19.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a fluid filling device for precisely filling a container, such as a small mold for molding resin, with a fluid such as a molten resin.

[Conventional technology]

Conventionally, when filling a mold with molten resin, a constant volume dispenser is used to measure and inject the resin. (Problems to be Solved by the Invention) In such conventional dispensers, it is difficult to control the filling amount due to fluctuation factors such as the pressure during resin discharge, the viscosity of the fluid, and the expansion and contraction of the tube that is the resin discharge conduit. Precise control was not possible. In particular, the smaller the mold to be filled with resin and the smaller its capacity, the greater the influence of the above fluctuation factors, making it impossible to fill resin with high precision using conventional dispensers. To solve this problem, it is possible to use a gear pump, but due to factors such as the viscosity of the liquid resin, it is still not possible to fill the mold with high precision. There is a problem that there is variation in the amount, which causes variation in the shape of the finished product.Furthermore, it is possible to use a sensor to detect the liquid level of the resin discharged into the mold. In this case, there is a problem that the equipment becomes expensive and, in the case of transparent resin, the liquid level cannot be detected.This invention was made in view of the above conventional problems, and The purpose of the present invention is to provide a fluid filling device that can fill fluid such as resin with high precision, and in particular, prevents variations in the amount of filling even when the container (mold) to be filled is small. Means for Solving] The present invention comprises an injection means for injecting fluid into a container to be filled with fluid, a suction port that is accessible to the liquid level of the container into which the fluid is injected, and a negative pressure is applied. a suction means to be
The above object is achieved by a fluid filling device comprising a vertical movement means for moving the suction port of the suction means up and down relative to the container from above to a fixed position. Further, the above object is achieved by forming the suction port at the tip of a needle connected to the lower end of the suction means. Furthermore, the above object is achieved by providing a plurality of the suction ports. [Operations and Effects] In this invention, after injecting fluid into a container using an injection means such as a dispenser, the fluid is sucked by a suction means to which negative pressure is applied so that the liquid level in the container becomes a constant height,
Thereby, the level of the fluid in the container can be adjusted with high precision, and filling can be performed with high precision. The injection means for injecting the fluid only needs to inject an approximate amount larger than the capacity of the container, and the suction means can also be used as long as it suctions the fluid at a certain height, so these can be constructed at low cost. can do. [Examples] Examples of the present invention will be described below with reference to the drawings. In this embodiment, as shown in FIG.
Container 1 as a resin mold is conveyed in the direction of the arrow by
2, a syringe 16 for injecting the resin 14 in a molten state;
Container 1 after resin 14 is injected from this syringe 16
2 and a suction container 18 that sucks resin of a certain height or more, a fluid filling device 20 is constructed. The syringe 16 is connected to a dispenser 22 and is adapted to inject a little more resin into the container 12 than the required resin filling 1 into the container 12. A needle vibrator 17 is vertically attached to the lower end of the syringe 16, and resin is injected into the container 12 from the lower end of the needle vibrator 17. The suction container 18 is composed of a syringe connected to a suction device 24 that generates negative pressure, and a needle vibrator 19 similar to that of the syringe 16 is vertically attached to the lower end of the syringe. The raised molten resin 14 is sucked. As shown in FIG. 2, the suction container 18 is supported at the tip of an arm 28 that moves up and down in the vertical direction by a drive device 26. An arm height adjustment bin 3 is located below the arm 28.
0 is placed. This arm height adjustment bin 30 has a micrometer 30A.
are integrally attached, and its height can be finely adjusted. Next, the fluid filling device 20 fills the container 12 with resin 1.
The process of precision filling 4 will be explained. The conveying means 10 intermittently conveys the containers 12 at appropriate intervals in the direction of the arrow in the figure. The molten resin 14 is injected from the needle vibrator 17 into the container 12 which is stopped at a position below the syringe 16 . The amount of injection at this time is slightly larger than the required amount. Therefore, the resin 14 rises up from the container 12 as shown in the figure, and is transported to a position below the suction container 18 by the transport means 10. Here, the suction container 18 is moved up and down by the drive device 26 via the arm 28 within a height range adjusted by the arm height adjustment bin 30, and the needle vibrator 19 at the lower end of the suction container 18 is moved up and down by the drive device 26 via the arm 28. Arm height adjustment bin 30
When the resin 14 descends until it touches the upper end of the container 12, the excess amount of the resin 14 that has risen from the container 12 is sucked out. As mentioned above, the lower limit position of the needle pipe 19 at the lower end of the suction container 18 is always finely adjusted to a constant level by the arm 28 and the arm direct adjustment bin 30, so that the amount of remaining resin in the container 12 is kept precisely constant. It will be controlled. According to the inventor's experiments, the internal volume of the container 12 is 0.05
In the case of cc, 60 pieces were filled, but all 60 pieces were evenly distributed, and no significant variation could be confirmed. In the above embodiments, filling the container 12 with resin and sucking out excess resin are performed using syringes each having a needle pipe attached to the lower end, but the present invention is not limited to this. , the resin 14 is placed in the container 12
The means for injecting the resin 14 into the container 12 may be any means as long as it can inject a roughly constant amount, and the means for suctioning the resin 14 rising from the container 12 may be any means that can similarly perform suction at a constant height position. For example, the present invention is not limited to the configuration of the above embodiment. However, when the resin is suctioned with a needle pipe, the amount of resin can be controlled with higher precision. Further, in the above embodiment, the suction container 18 moves up and down with respect to the container 12, but it is sufficient that these can move up and down relative to each other. It may also be made to move up and down relative to it. Further, in the above embodiment, one needle pipe 19 is attached to the suction container 18, that is, one resin suction port is provided, but as shown in FIG. When filling the container 32 with s1 mairi, it is preferable to provide a plurality of suction ports (needles) to uniformly suck the liquid.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of a fluid filling device according to the present invention, FIG. 2 is a side view showing a suction means of the same embodiment, and FIG.
The figure is a sectional view showing a second embodiment of a fluid filling device compatible with different containers. 12.32... Container, 14... Resin, 16... Syringe, 17.19... Needle pipe, 18... Suction container, 20... Fluid filling device, 22... Dispenser, 24... Suction device, 26... Drive device, 28... Arm, 30... Arm height adjustment bin.

Claims (3)

[Claims] (1) Injection means for injecting fluid into a container to be filled with fluid, suction means provided with a suction port that can access the liquid level of the container into which the fluid is injected, and to which negative pressure is applied; A fluid filling device comprising: vertical movement means for vertically moving a suction port of a suction means relative to the container from above to a certain position. (2) The fluid filling device according to claim 1, wherein the suction port is formed at the tip of a needle connected to the lower end of the suction means. (3) The fluid filling device according to claim 1 or 2, wherein the number of the suction ports is plural.