JPH04339726A - Liquid filling device - Google Patents

Abstract

PURPOSE:To prevent air from mixing in a cylindrical main body on which a chuck valve is arranged, from the outside, when a content is filled in a container from the chuck valve. CONSTITUTION:The title liquid filling device is equipped with a rod shaft 3 which is provided in a cylindrical main body 1 so as to be vertically driven; a first chuck valve 74 which is formed on the rod shaft 3 and discharges a fixed quantity of a liquid content N, which is pressure-filled from a filling cylinder, after reserving the fixed quantity of the liquid content N; and a second chuck valve 75 which is provided on the rod shaft 3, and is arranged at a nozzle part to release the liquid content N, which has been discharged by the first chuck valve 74, in a filling container 80. An elastic member 2 which energizes the rod shaft 3 in the direction to close respective chuck valves 74, 75 is provided.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid filling device, and more particularly to a liquid filling device suitable for filling a container with a highly viscous liquid containing solids.

0002

2. Description of the Related Art Conventionally, liquid filling devices have been used to fill predetermined amounts of various types of liquids containing solids, such as soup, into predetermined containers. FIG. 3 shows a schematic configuration diagram of a conventional liquid filling device 50, and FIG. 4(A) shows a sectional view of a main part of a liquid filling device 70.

As shown in FIGS. 3 and 4(A), a liquid filling device 50 includes a tank 51 for storing contents containing solids such as soup, and a tank 51 for pressurizing and pressure-feeding the contents. It includes a pressurizing section 60 and a filling section 70 that fills a container 80 with a predetermined amount of contents N. The pressurizing section 60 includes a filling piston 62 that is driven by a cam or the like inside a filling cylinder 61.
By driving the air cylinder 64, the content N supplied from the tank 51 via the connecting pipe 52 is transferred to a check valve (not shown) provided in the housing 63 and a pipe 65. Pressure is fed to the filling section 70 via the.

The filling section 70 includes a rod shaft 72 inside a cylindrical main body 71 and is driven vertically by an air cylinder 76 . The rod shaft 72 includes a piston 73 from above,
A first check valve 74 for discharge and a second check valve 75 for controlling opening and closing of the nozzle 71a are each fixed. The first check valve 74 is brought into contact with the valve seat 71b and temporarily stores in the main body 71 a predetermined amount of the content N that is pressure-fed through the pipe 65. The second check valve 75 is in contact with the valve seat 71c, and uses the surface tension of the contents N to remove the last hard part (liquid drip) B of the contents filled into the container 80 from the end surface of the nozzle 71a. Container 80
Try not to fall in any direction. That is, the second check valve 75 prevents liquid drips (droplets) B from staining the outer surface of the container 80.

Next, the speed of the filling piston 62 of the pressurizing section (
That is, the filling speed) and the opening/closing operation of the first check valve 74 of the filling section (that is, the same as the opening/closing operation of the second check valve 75) are determined based on FIGS. 4(B) and (C). explain. As shown in FIG. 4(B), the filling piston 62 (see FIG. 3) starts its upward movement at timing t1, and the filling speed gradually increases. At timing t2, the rising speed of the filling piston becomes constant, and at timing t
The speed remains constant until 3. At timing t3, the speed of the filling piston begins to gradually decrease (i.e., the supply pressure gradually decreases), and at timing t4, the upward movement of the filling piston 62 is completed, pressure feeding is stopped, and a certain amount of content is supplied, One cycle of filling operation is completed. Further, as shown in FIG. 4(C), the first check valve 74 is opened at once at timing t1 to fill the container 80 with the contents N, and at timing t4, the first check valve 74 is closed at once.

[0006]

[Problem to be solved by the invention] However, FIG.
As is clear from B) and (C), at the beginning of filling, there is no problem since the cylindrical body 71 is filled with the filling material, but at the end of filling (indicated by the symbol x), the filling piston 62 Although the filling speed of the contents N supplied by the operation gradually decreases, the opening degree of the first check valve 74 remains open until timing t4. Therefore, if the content is highly viscous, even if the supply speed (filling speed) from the filling piston 62 decreases,
Due to the high viscosity, the falling speed from the nozzle is so high that the container 8
Do not fall towards 0. Therefore, even after the second check valve 75 is closed, no liquid drips and the container 80 is not contaminated.

However, when the content N has a low to medium viscosity, the falling speed of the content N from the nozzle 71a becomes faster than the filling speed, and external air enters the inside of the main body 71 from the nozzle 71a. Mix with contents N. This mixing disrupts the balance of the surface tension, which may cause "liquid dripping" after the nozzle 71a is closed, which may stain the container 80.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a liquid filling device that prevents external air from mixing with the contents, regardless of the viscosity of the contents.

[0009]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a rod shaft provided inside a cylindrical body so as to be driven up and down, and a filling cylinder formed on the rod shaft to which pressure is applied. A first check valve that stores and discharges a fixed amount of the liquid filling to be filled, and a second check valve that is provided on the nozzle portion that is provided on the rod shaft and discharges the discharged liquid filling into the filling container. In the liquid filling device, an elastic member is provided so that the rod shaft is biased in a direction to close each check valve.

0010

[Operation] According to the present invention, the rod shaft is forcibly moved back by the elastic member (spring) almost at the same time that the filling speed of the contents to the upstream side of the first check valve becomes slow. The opening amount gradually becomes smaller. Therefore, the amount of contents passing through the first check valve and the amount of contents filled into the container from the second check valve are approximately equal, and the contents temporarily retained on the upstream side of the second check valve are , no air is mixed in.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below based on the illustrated embodiments. Note that the parts explained in FIG. 3 and FIG. 4(A) are denoted by the same reference numerals, and redundant description will be omitted. As shown in FIG. 1, a partition wall 1a is provided on the upper part of the cylindrical main body 1 of the filling part 10, and a cylindrical part 20 is provided on the partition wall 1a. A compression spring 2 is housed within this cylindrical portion 20. The lower end of this compression spring 2 is placed on the partition wall 1a, and the upper end is locked to a stopper ring 4. The stopper ring 4 is fixed around the rod shaft 3.

That is, the partition wall 1a and the stopper ring 4
The compression spring 2 is disposed between the rod shaft 3 and the compression spring 2, and the rod shaft 3 is pulled upward by the compression biasing force. An air cylinder 5 is disposed at the upper end of the rod shaft 3 to drive the rod shaft 3 up and down. The air cylinder 5 is supplied with compressed air from the air source 9 and driven downward by the operation of the first solenoid valve 6, and is driven upward by the compressed air supplied from the air source 9 by the operation of the second solenoid valve 7. It has become so. The first and second electromagnetic valves 6 and 7 are driven based on control signals from the control section 8.

Next, the operation of the filling section 10 will be explained based on FIGS. 2(A), 2(B), and 2(C). In addition, Fig. 4(B)
, (C) are given the same reference numerals, and duplicate descriptions will be omitted. As shown in FIGS. 2(A), (B), and (C), at timing t1, the filling piston 62
(See Fig. 3) At the same time as the operation starts, the first solenoid valve 6 is turned on and the first check valve 74 is opened all at once, and the contents N
The filling of the container 80 is started. From timing t1 to t
2, the filling speed (filling pressure) of the contents N increases, and during this period, the "supply pressure" of the contents N exceeds the "compression force" of the spring 2, so the nozzle 71a remains open. be done. At timing t2, the filling speed (i.e.
The speed of the filling piston 62) remains constant and the supply of the contents N continues. Eventually, at timing t3, the first
When the operation of the solenoid valve 6 is turned off, the first solenoid valve 6 and the second solenoid valve
Both the solenoid valve 7 and the solenoid valve 7 are turned off, and air pressure is no longer supplied to the air cylinder 5 (the air cylinder is in a free state). That is, only the biasing compression force of the compression spring 2 acts on the rod shaft 3 in the upward direction, but as the filling speed decreases (the portion indicated by the symbol x), the supply pressure of the content N also gradually decreases. Therefore, in the portion indicated by the symbol x, the degree of opening of the first check valve 74 gradually decreases, and the opening degree of the first check valve 74 gradually decreases.
The amount of the contents passing through the nozzle 71a and the amount of the contents discharged outward from the nozzle 71a (that is, filling the container 80) are almost the same. Therefore, air does not enter the main body 1 from the outside, and the contents and air do not mix. This state continues until timing t4. At timing t4, the second solenoid valve 7 is turned on,
The rod shaft 3 is pulled upward and the first check valve 74
and the second check valve 75 simultaneously close their respective valve seats 71b.
, 71a, and the supply of contents is completely stopped.

[0014] By repeating the same operation, the contents of the container 80 are sequentially filled without causing any dripping. It goes without saying that the forced recovery drive using the spring described above can be applied not only when the viscosity of the filler is low, but also when the viscosity of the filler is high.

[0015]

[Effects of the Invention] As explained above, according to the present invention, when the rod shaft is in a free state and the supply amount of the contents is decreasing, the check valve is gradually opened by the operation of the elastic member (spring). As the valve closes, the contents passing through the check valve and the on-off valve become almost equal, preventing air from entering the main body from the outside, and preventing liquid dripping.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a liquid filling device of the present invention.

FIGS. 2A, 2B, and 2C are time charts showing the operation of the liquid filling device.

FIG. 3 is an overall configuration diagram of an apparatus to which a conventional liquid filling apparatus is applied.

FIGS. 4A, 4B, and 4C are side sectional views of a conventional liquid filling device and time charts of check valves and filling speeds.

[Explanation of symbols]

1...Main body (cylindrical body) 1a...Partition wall 2...Spring (elastic member) 3...Rod axis 4...Stopper 5...Air cylinder 6...First solenoid valve 7...Second solenoid valve 8...Control unit 9...Air source 20...Cylinder part 62...Filling cylinder 74...First check valve 75...Second check valve 80...Container B...Liquid dripping N...Contents

Claims (1)

[Claims] 1. A rod shaft provided inside a cylindrical body so as to be driven up and down, and a first valve that stores a fixed amount of liquid filling formed on the rod shaft and is filled under pressure from a filling cylinder, and then discharges the liquid filling. In the liquid filling device, the liquid filling device includes a first check valve and a second check valve provided on the rod shaft and provided at a nozzle portion for discharging the discharged liquid filling into a filling container. A liquid filling device characterized in that an elastic member is provided so as to be biased in a direction to close each check valve.