JPH0752902A - Liquid charger - Google Patents

Abstract

PURPOSE:To enable the prevention of liquid dripping by operating a sack bag with thrust members when liquid charging is stopped. CONSTITUTION:In a liquid charger, a liquid passage 6 to guide liquid from a tank 1, holding liquid to be charged, to a charging nozzle 5, a flexible tube 3 is provided throughout a specified section of the passage 6, and movable thrust members to thrust the flexible tube 3 are provided. Liquid flow rate is controlled at the flexible tube 3 in a plurality of steps with the thrust members when charging is started, and at least one of the downstream thrust members is retracted when charging is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid filling machine capable of accurately filling liquid into a container such as an ampoule or a bottle.

[0002]

2. Description of the Related Art Conventionally, a liquid is introduced from a tank storing a liquid to be filled in a container to a filling needle through a conduit, and an opening / closing valve provided in the conduit is opened to inject the liquid into the container at the pressure of the liquid. In the liquid pressure filling method, the liquid filling is started by opening the opening / closing valve, and then the liquid pressure upstream of the opening / closing valve is measured, and the measured pressure is determined according to a predetermined pressure-filling time function. There is a liquid pressure filling method (see Japanese Patent Publication No. 46392/1989) characterized in that a filling time is calculated by a calculator and the on-off valve is opened for a time according to the calculation result.

[0003]

However, in the opening / closing method of the opening / closing valve in the above-mentioned conventional technique, one pushing frame (opening / closing valve) is moved forward and backward by the operation of the air cylinder. When the viscosity of the liquid to be filled is low even when the liquid is advanced to the closed state, there is a problem that there is a high risk of liquid dripping. In view of this point, an object of the present invention is to provide a liquid filling machine that does not cause dripping even if the viscosity of the filling liquid is low.

[0004]

In order to solve the above-mentioned problems, the present invention provides a liquid passage for guiding the liquid from a tank storing a liquid to be filled to a filling nozzle, and the liquid passage is provided in a certain section of the liquid passage. In a liquid filling machine provided with a flexible tube and a movable pressing member for pressing the flexible tube, a plurality of the pressing members are provided, and the flow rate of the flexible tube is set in a plurality of stages by the pressing member at the time of filling. A technical means of controlling and moving at least one of the downstream pressing members from the forward movement position to the backward movement position when the filling is stopped is adopted.

[0005]

As a result of adopting the above technical means, the present invention moves at least one of the plurality of pressing members on the downstream side from the advanced position to the retracted position when the filling is stopped to cause the suck back phenomenon, and It acts to prevent dripping.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. The embodiment shown in FIG. 1 is an embodiment according to the present invention and is a schematic front view for explaining the whole image. Reference numeral 1 denotes a tank storing a liquid to be filled, a flow rate sensor 2 through a liquid passage 6 for guiding the liquid in the tank 1, and a flexible tube 3 at an appropriate fixed section. The flexible tube 3
Is provided with a filling control valve 4 composed of a plurality of pressing members,
The container 5 is filled with the liquid from the nozzle 5 via the plurality of pressing members. The control device 8 is provided so that the pressing degree of the plurality of pressing members can be controlled by the information signal from the flow rate sensor 2.

Here, the specific construction and operation of the filling control valve 4 of the present invention will be described in detail with reference to FIGS. First, the configurations of the flexible tube 3 and the filling control valve 4 will be described with reference to FIG. As you can see from Figure 1,
From the tank 1 that stores the liquid to be filled, to the flow sensor 2,
A liquid passage 6 is connected to the nozzle 5. This nozzle 5
A flexible tube 3 is provided over a certain section on the upstream side of, and a filling control valve 4 composed of a plurality of pressing members for pressing the flexible tube 3 (hereinafter referred to as a filling control valve composed of two pressing members. Described). Various configurations can be adopted for the filling control valve 4 including the two pressing members as long as the flexible tube 3 can be pressed and closed, and the pressing can be released and opened. Such a first pressing member 9 resists the spring 12 when the actuating member 11 is pressed and dents the flexible tube 3 to be fully closed, and when the pressing of the actuating member 11 is released, the spring 12 is pressed.
The stroke of the piston is determined so that it will be fully opened. The second pressing member 10 has the same structure, and the stroke is determined so that the piston can fully open and half open the flexible tube 3.

Next, the operation of the filling control valve 4 will be described with reference to FIGS.
This will be described in detail with reference to FIG. First, the nozzle 5 is inserted up to near the bottom of the container 7 by an elevator drive device (not shown) and stopped. At this time, the filling control valve 4 is in a state where the first pressing member 9 fully closes the flexible tube 3 and the second pressing member 10 fully opens the flexible tube 3 (see FIG. 2). Then, the first pressing member 9 is brought into a state where the flexible tube 3 is fully opened from the state of FIG. 2 and the filling is started (FIG.
The nozzle 5 rises at a constant speed. When the flow sensor 2 detects that the filled liquid has reached a predetermined value, the second pressing member 10 moves forward to bring the flexible tube 3 into a half-open state (see FIG. 4). The flow rate of the filling liquid flowing out from the nozzle 5 is smaller than that in the state of FIG. Then, when the flow rate sensor 2 detects that the flow rate to be filled flows, the first pressing member 9 advances and the filling is completed (see FIG. 5). Next, as the second pressing member 10 retracts, the internal volume of the flexible tube 3 is increased, a suck back phenomenon occurs, the filling liquid in the nozzle 5 is pulled up, and liquid dropping is prevented. .

As described above, in the present embodiment, the valve is controlled by the filling flow rate by using the flow rate sensor. Instead of the flow rate sensor, a sensor is provided near the tip of the nozzle and the valve is controlled by the height of the nozzle. Is also good. Also, as a filling machine,
It can also be applied to weight filling machines and timer filling machines.

[0010]

As a result of adopting the above configuration, the present invention provides
The following effects can be obtained. (1) By providing a plurality of pressing members, suck back can be activated when the liquid filling is stopped, and liquid dripping can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic front view of a filling machine using a filling control valve of the present invention.

FIG. 2 is a partial cross-sectional view showing the operation when sucking back at the end of liquid filling in the embodiment.

FIG. 3 is a partial sectional view showing an operation at the time of full filling in the embodiment.

FIG. 4 is a partial sectional view showing an operation at the time of filling a small amount in the embodiment.

FIG. 5 is a partial sectional view showing the operation of the valve at the end of filling in the embodiment.

[Explanation of symbols]

1 ... Tank 2 ... Flow sensor 3 ... Flexible tube 4 ... Filling control valve 5 ... Nozzle 6 ... Liquid passage 7 ... Container 8 ... Control device 9 ... First pressing member 10 ... Second pressing member 11 ... Operating member 12 ... Spring

Claims (1)

[Claims] 1. A liquid passage for guiding a liquid from a tank storing a liquid to be filled to a filling nozzle is provided, a flexible tube is provided in a certain section of the liquid passage, and the flexible tube is movable by pressing. In a liquid filling machine provided with a different pressing member, a plurality of the pressing members are provided, the flow rate of the flexible tube is controlled in a plurality of stages by the pressing member during filling, and at least one of the downstream pressing members is stopped when filling is stopped. A liquid filling machine characterized in that one is moved from a forward position to a backward position.