JPS6020276B2 - filling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a filling device, and more particularly, the present invention relates to a filling device, and more particularly, a level detection device that continuously blows out low-pressure air as a liquid level control means for filling a container with a filling liquid to a predetermined liquid level height. The present invention relates to a filling device that is equipped with a pipe and is configured to close a liquid valve by increasing air pressure when the air injection outlet of the level detection pipe is closed with a filling liquid, thereby completing filling of the filling liquid.

This type of filling device is already known, as described in Japanese Patent Publication No. 52-28073, for example.

This type of filling device is configured to close the liquid valve by increasing the air pressure as described above, so there is a slight delay after the filling liquid closes the air outlet of the level detection tube until the liquid valve actually closes. There is a time lag. Therefore, if you increase the filling amount per unit time by shortening the filling time, the amount filled into the container during the above time lag will increase, and as a result, the liquid level height can be controlled with high precision. It was becoming difficult to do so. In view of these points, the present invention provides at least two level detection tubes, and performs high-speed filling by increasing the opening degree of the liquid valve until the first level detection tube detects the liquid level. After the level detection tube detects the liquid level, the pressure of the liquid valve is reduced to perform low-speed filling, and in this state, the liquid level is brought to a predetermined height position by the second level detection tube. The liquid valve is configured to close the liquid valve upon detecting the liquid, thereby making it possible to simultaneously shorten the filling time and control the liquid level with high precision.

The present invention will be described below with reference to the illustrated embodiment. In FIG. 1, 1 is a pipe having a mirror property, such as a vinyl pipe, and the upper end of this pipe 1 is connected to a filling liquid tank (not shown). .

On the other hand, the lower end of the pipe 1 is connected to a liquid injection pipe 3 fixed to the support member 2, and the filling liquid from the tank is supplied to the pipe, and a liquid valve 4 and liquid injection pipe 3, which will be described later, are connected in the middle of the pipe 1. The container B can be filled through the container B. The support member 2 includes first and second level detection tubes 8 and 9 coaxially mounted with iron on the outer circumference of the columnar liquid tube 3.
The gap between the inner circumference of the level detection tube 8 and the outer circumference of the liquid injection tube 3 is defined as the first air passage 10, and the gap between the inner circumference of the second level detection tube 9 and the outer circumference of the first level detection tube 8 is defined as the first air passage 10. is defined as the second air passage 11.

Low-pressure air can be supplied to each of the air passages 10 and 11 separately through a first supply port 12 and a second supply port 13 provided in the support member 2. By the way, the lower end surfaces of each of the level detection tubes 8 and 9 are set above the lower end surface of the liquid liquid tube 3, respectively.
The lower end surface of the second level detecting tube 9 is set to substantially match the predetermined liquid level height of the filling liquid, while the lower end surface of the first level detecting tube 8 is set to substantially match the predetermined liquid level height of the filling liquid. It is positioned below the lower end surface of the level detection tube 9 by a predetermined amount.

This amount is determined by the filling amount during high-speed filling and the level detection tube 8.
, 9 is set in consideration of the inner fold of the container B near the lower end. The liquid valve 4 is equipped with a valve body 14 and a valve actuation mechanism 15 fixed to a machine frame (not shown), and this valve actuation mechanism 15 controls the amount of operation of the valve body 14 in two stages. The opening degree of the valve 4 can be controlled in two stages, large and small.

This valve operating mechanism 15 includes a cylinder 16, a small diameter cylinder 17 which is iron-coupled to the right of the approximately middle part of the cylinder 16, the right opening of the cylinder IS, 17, and the middle part of the cylinder 16. Plate bodies 18, 19 that close respectively
Pistons 20 and 21 are movably mounted in the cylinder 16 and the cylinder 17, respectively.

The right end of the valve body 14 is slidably passed through the intermediate plate 19 and the piston 20 to maintain airtightness, and is connected and fixed to the right piston 21. A spring 22 is elastically mounted between the right plate body 18 and the piston 21, and the spring 22 causes both the pistons 21, 20 and the valve body 14 to
Normally, the left end of the valve body 14 is pressed against the pipe 1 and crushed, thereby closing the liquid valve 4 constituted by this part.

The chamber housing the spring 22 is opened to the atmosphere through a hole 23 made in the right plate 18, and the chamber 24 between the pistons 20 and 21 and the left piston 20 and plate 19 are connected to each other. The chambers 25 between them are respectively pneumatic chambers, and the cylinder 16 is formed with common ports 26 and 27 for introducing air pressure into the respective pneumatic chambers 24 and 25. Furthermore, a bolt 2 for adjusting the stroke amount of the valve body 14 is attached to the right plate body 18.
8, and the stroke amount (1,) of the right piston 21 determined between the left end surface of this bolt 28 and the right end surface of the valve body 14 is made to match the predetermined maximum lift amount of the valve body 14. The opening degree of the liquid valve 4 required for high-speed filling is given by this. Also, the stroke amount of the left piston 20 (12
) is smaller than the above stroke amount (1,), and 1,
The value of -12 is set to give the opening degree of the liquid valve 4 necessary for low-speed filling. In addition, on the left end of the valve body 14,
By providing a round bar-shaped pressing member 29 disposed in a direction perpendicular to the pipu and the valve body 14, this pressing member 29 and a supporting plate 30 fixed to the left end of the cylinder 6 in correspondence with the pressing member 29 can smoothly operate. It is preferable to crush the pipe 1 in a manner that allows the pipe 1 to be crushed in a state in which the pressure member 29 presses the pipe 1 to some extent when the liquid valve 4 is fully open. It is preferable to set the inner diameter of the pipe 1 and the amount of movement of the valve body 14 so that the area can be secured.

Further, 31 indicates the level detection pipes 8, 9 and the valve operating mechanism 1.
This circuit 31 controls the supply of air pressure to the air chamber 24 according to the air pressure value of the air pump and the first level detection tube 8. It is provided with a switching valve to control and a switching valve to control the supply of air pressure to the air pressure chamber 25 according to the air pressure value of the second level detection tube 9.

This pneumatic circuit 31 is similar to the pneumatic control circuit of the above-mentioned publication.
Since it can be easily obtained by providing a set, a detailed explanation of its configuration will be omitted. In the above configuration, in the state before filling, air pressure is not introduced into both air pressure chambers 24 and 25, and the valve body 14 is moved to the left by the spring 22, crushing the pipe 1, and closing the liquid valve 4. There is.

On the other hand, low-pressure air is supplied to both the level detection tubes 8 and 9, and is blown out into the atmosphere from the lower end exits of the respective air passages 10 and 11. In this state, when container B is supplied as shown by the imaginary line in FIG. It is operated in a simulated manner to supply air pressure to each of the air pressure chambers 24 and 25.

Then, due to the air pressure supplied to the air pressure chamber 24, the piston 21 moves to the right against the spring 22 until it hits the bolt 28, so that the liquid valve 4 is opened at a large opening for high-speed filling, as described above. Therefore, the filling liquid in the tank is quickly filled into the container B via the pipe and the liquid injection pipe 3. When the filling liquid progresses and the liquid level closes the air outlet of the first level detection tube 8, the pressure inside the air passage 10 to the first level detection tube 8 increases, and this causes the pressure in the pneumatic circuit 31 to increase. The switching valve operates to stop the supply of air pressure to the air pressure chamber 24.

Then, the piston 21 is moved to the left by the spring 22,
At this time, air pressure is still introduced into the air pressure chamber 25 and the left piston 20' is located at the rightmost end position, so the piston 21 is moved to the left by an amount of 1,112, as described above. In addition, the liquid valve 3 has a low pressure that allows for low-speed filling. The filling amount per unit time during this low-speed filling is preferably 1/3 to 1/9 of the filling amount during high-speed filling, for example.
This low-speed filling causes the level of the filling liquid to rise slowly, and when this closes the air injection outlet of the second level detection tube 9, the supply of air pressure to the air pressure chamber 25 is stopped and the liquid valve 3 is closed. Filling is completed.

FIG. 2 shows another embodiment of the present invention. In this embodiment, a tank (not shown) and the liquid injection pipe 3 described above are connected by a horizontal liquid passage pipe 32, and a valve is connected to the connection part. A seat 33 is provided.

The valve actuating mechanism 15 has its valve body 14 vertically fixed to a machine frame (not shown), and the lower end of the valve body 14 is inserted into a liquid passage pipe 32 while keeping it liquid-tight.
The elastic force of 2 causes the lower end of the valve body 14 to be pressed against the valve seat 3.
3 and the liquid valve 4 is closed. The other configurations are the same as those in FIG. 1, and the same or corresponding parts are designated by the same reference numerals as in FIG. 1.

It is clear that even in such a configuration, substantially the same effects as those shown in FIG. 1 can be obtained. In the above-mentioned embodiment, two level detection tubes 8 and 9 are provided at the same location as the Western liquid pipe 3 to form a triple pipe structure, but it is of course possible to arrange each pipe separately. be.

As described above, the present invention provides a liquid passage that connects a filling liquid tank and a liquid injection pipe for filling the filling liquid into the container, and a liquid passage that is normally energized by a closing device to open and close this liquid passage. A valve, a pneumatic valve actuation mechanism that opens the valve body of this liquid valve in two stages of large opening and small opening, and air injection outlets with different heights for the lower layer and the higher layer to inject the liquid. first and second level detection tubes closed adjacent to the tube; and air pressure for supplying detection air to the first and second level detection tubes and supplying and discharging operating air pressure to the valve operating mechanism. The valve operating mechanism includes a control circuit, and the operating shaft of the liquid valve body is introduced by slidingly inserting the bottom of a stepped cylinder having a larger diameter on the bottom side, and the operating shaft is inserted into the end of the operating shaft. A first piston is attached to the small diameter portion of the cylinder to maintain a stroke amount corresponding to the large opening of the valve body, and the first piston is overlapped with the first piston of the parenthesis and ironed to the large diameter portion of the cylinder. The second piston is slidably mounted on the operating shaft, and the second piston is made to maintain a stroke amount smaller than the stroke amount of the first piston. and detecting an increase in air pressure based on the closure due to the liquid level of the second level detection tube, and selectively applying air pressure to the respective air pressure chambers defined at the bottom side of the cylinder of the first and second pistons in the valve operating mechanism. Since it is equipped with a switching valve mechanism for simulating supply, it is possible to achieve high-speed filling due to the large opening of the liquid valve, i.e., to shorten the filling time, and highly accurate liquid level height control using the second level detection tube when the liquid valve is in a low state. reliably, automatically, and simultaneously by using a valve actuation mechanism consisting of a cylinder and piston mechanism and a pneumatic control circuit that is actuated by the detection pressure of each of the level detection tubes and supplies and discharges operating air pressure to the valve actuation mechanism. The effect of being able to do this is obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG. 2 is a sectional view of another embodiment. 1: Pipe, 3: Liquid injection pipe, 4: Liquid valve, 8, 9: Level detection tube, 10, 11: Air passage, 14: Valve body, 15:
Valve actuation mechanism, 24, 25: pneumatic chamber, 31: pneumatic control circuit. Figure 2 diagram

Claims (1)

[Claims] 1 A liquid passage that communicates between the filling liquid tank and the liquid injection pipe that fills the filling liquid into the container, a liquid valve that is normally energized by a closing device to open and close this liquid passage, and a valve body of this liquid valve that is opened to a wide angle. A valve actuation mechanism using pneumatic pressure that opens the valve in two stages: and a small opening degree, and a first and second air injection outlet opening adjacent to the liquid injection pipe with air injection outlets at different heights at a low position and a high position. A second level detection tube, and a pneumatic control circuit that supplies detection air to the first and second level detection tubes and supplies and discharges operating air pressure to and from the valve operating mechanism, the valve operating mechanism comprising: The operating shaft of the liquid valve valve body is introduced by slidingly inserting the bottom part into a stepped cylinder having a large diameter on the bottom side, and the small diameter part of the cylinder is fitted onto the end of this operating shaft, and the valve body is inserted into the stepped cylinder. A first piston that maintains a stroke amount corresponding to the large opening of the body is attached, and a second piston that overlaps the first piston and fits into the large diameter portion of the cylinder is slidable on the operating shaft. At the same time, the second piston is caused to maintain a stroke amount smaller than the stroke amount of the first piston, and the pneumatic pressure control circuit is provided with a control signal according to the liquid level of the first and second level detection tubes. A switching valve mechanism is provided that detects an increase in air pressure due to closure and selectively supplies and discharges air pressure to each air pressure chamber defined at the bottom side of the cylinder of the first and second pistons in the valve operating mechanism. Characteristic filling equipment.