JPS5954925A - Constant quantity measuring device - Google Patents

Abstract

PURPOSE:To obtain a highly accurate device, which has a simple structure and can be applied to fluid having any property, by conducting a current intermittently, through a coil controlling the opening and closing of two selector valves, thereby operating the piston type measuring device. CONSTITUTION:Every time a pair of control pulses are oscillated by a control pulse oscillator 18, a piston 9-2 performs one reciprocal operation. At every time of the operation, a fluid 2, which has a volume obtained by multiplying the cross sectional area of the piston 9-2 by the moving distance of the piston, is pushed out of a nozzle 21. Namely, a control device for selector valves 7 and 8 and a coil 9-5 is formed by a relay 16, the control pulse oscillator 18, and a T bistable element 19. By said control device, the selector valves are controlled, an exciting current for the coil 9-5 is intermittently controlled, and a piston type measuring device 9 is operated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a quantitative metering device, particularly to an improvement of a piston-type quantitative metering device capable of delivering minute amounts of various fluids.

Nowadays, various types of adhesives are used in automatic production lines in various industries.

Therefore, it is necessary to accurately supply and apply the appropriate amount of these adhesives to the surface of the parts to be adhered, but the automatic quantitative measuring devices conventionally used for this purpose have many problems. can be,
A solution is requested □.

The same situation applies to equipment that performs pouring, addition, packaging, and other operations of various additives, dyes, drugs, seasonings, etc. There are a wide range of areas in which the apparatus can be used.

Quantitative measuring devices are widely used, for example, in packaging devices for various plastic materials, high-viscosity or low-viscosity fluid products, and other fields. The piston-type metering device used includes:
The structure is complex and expensive, there are many restrictions on the properties of the fluid to be measured, there is a negative pressure inside the device during operation, which may cause air bubbles to get mixed in, and fluid leakage is inevitable. There were many other problems.

Another object of the present invention is to improve this known piston-type quantitative metering device, which has a simple structure and is completely sealed, so that it can be used with fluids of any nature, and is free from fluid leakage and air bubbles. It is an object of the present invention to provide an economical, safe, and highly accurate quantitative needle metering device that is free from the fear of oxidation, requires less power, and is economical.

Note that in this specification, fluids include not only ordinary gases and liquids but also various adhesives and other polymeric substances, such as high viscosity or plastic substances such as molasses, miso, mayonnaise, and toothpaste.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be explained below in comparison with a conventionally known structure with reference to the drawings.

The drawing is an explanatory diagram showing an embodiment of the quantitative measuring device according to the present invention, and in the drawing, 1 indicates a storage tank containing a fluid 2;
3 is a high pressure air tank, 4 is a pressure control valve 4.5 is an air line, 6 is a temperature control device, 7 is a first switching valve, 8 is a second switching valve, 9 is a piston type meter, 10 is a stop valve, 11 is a fluid supply pipe, 12 and 13 are fluid delivery pipes, 14 and 15 are fluid transfer pipes, 10 is a relay, 17 is a power supply, 18 is a control pulse oscillator, 19 is a T bistable element, 20
is a counter, 21 is a nozzle, 22 is a fluid container 23.23
It is a conveyor that transports.

In this embodiment, the fluid 2 to be measured is stored in a storage tank 1, and is applied to a desired pressure by a fluid supply device consisting of the storage tank 1, high pressure air tank 3, pressure control valve 4, and airline 5. After being pressurized and brought to a constant temperature by the temperature control device 6, it is supplied into the piston chamber from the flow hole 9-3b of the piston-type meter 9 via the fluid supply pipe 11.

The piston type lightweight device 9 consists of a cylinder side wall member 9-1, a piston 9-2, cylinder lids 9-3 and 9-4, a coil 9-5.0, and rings 9-6 and 9-7.

A cylinder lid body 9-3 and 9-4 is removed from each end of the cylinder side wall member 9-1 to form a cylinder,
A piston 9-2 is slidably inserted into a piston chamber 9-1a formed therein, and a cylinder side wall member 9
A coil 9-5 is placed in an annular groove near one end of -1.
is wound to form a piston type measuring device 9.

Thus, the cylinder lid body 9-3 is connected to the first piping connection portion 9-3.
The cylinder cover body 9-4 has a second pipe connection part 9-4a and a communication hole 9-4b.

The first pipe connection 9-3a leads to the storage tank 1 by a fluid supply pipe 11 and to the second pipe connection 9 by a fluid transfer pipe 14.15 in which a second switching valve 8 is inserted.
-4a, and the second pipe connection 9-4a communicates with the nozzle 21 by means of fluid delivery pipes 12, 13, which also have a second switching valve 7.

Also, the position, number of turns, rated current, etc. of the coil 9-5 are such that when it is energized and excited, the piston 9-2 is attracted to the coil 9-5 side and moves rightward to the end position 9 as shown by the dotted line. -2
It is configured to be held at α.

In the state shown, the first switching valve 7 is open and the second switching valve 8 is closed, so that the pressure of the fluid 2 supplied from the storage tank 1 causes the piston 9-2 to move in the direction shown in FIG. It is moved to the left movement end position shown by the solid line inside, and the flow hole 9-4b is closed.

In this state, the control pulse oscillator 18 outputs one control pulse, the T-bistable element 19 is reversed, the coil 16-1 of the relay 16 is energized, and the conductor piece 16 is inverted.
-2 is switched to the b contact side, the coil 9-5 is energized and excited, the first switching valve 7 is closed, and the second switching valve 8 is opened.

At this time, in order to prevent negative pressure from occurring within the device, the circuit may be configured so that first the first switching valve 7 is closed, then the second switching valve 8 is opened, and then the coil 9-5 is energized. Recommended.

In this case, the piston 9-2 is attracted to the right in the figure, so the fluid on the right side of the piston 9-2 flows through the flow hole 9-3b.
through the fluid transfer pipe 14 and the second switching valve 8
and the fluid transfer pipe 15, and are transferred into the piston chamber on the left side of the piston 9-2.

When moving this piston 9-2, the piston 9-2
The electromagnetic force acting on the coil 9-5 and the resistance force due to the internal friction of the fluid need only be balanced, and the air pressure in the storage tank 1 does not affect the movement of the piston 9-2, so the electromagnetic force due to the coil 9-5 is approximately It doesn't have to be something big.

When the piston 9-2 reaches the right end of its movement, that is, the position 9-2a indicated by the dotted line, its right end surface touches the flow hole 9.
Since it comes into contact with the entrance of -3b and stops, the transfer of the fluid 2 also stops.

Next, when the control pulse oscillator 18 oscillates the next pulse, the relay 16 returns to the illustrated state again, the first switching valve 7 is opened, the first switching valve 7 is closed, and at the same time, the coil 9-5 is closed. The energization is cut off, and the electromagnetic force restraining the piston 9-2 disappears.

In this case, the air pressure in the storage tank 1 is applied to the right end surface of the piston 9-2, but the pressure on the left end surface disappears, so the piston 9-2 is pushed to the left and moves. - The fluid 2 on the left side is sent out sequentially through the fluid delivery pipe 12, the first switching valve 7, and the fluid delivery pipe 13, and is sent out from the tip of the nozzle 21 into a fluid container that is sequentially transported by the conveyor 22. 23. It is injected into the inside of 23.

The injection of fluid 2 then stops when the piston 9-2 reaches the end of its movement to the left as shown.

Thereafter, each time the control pulse oscillator 18 oscillates a pair of control pulses, the above cycle is repeated and the piston 9-
2 makes one reciprocation, and each time, a volume of fluid 2 obtained by multiplying the cross-sectional area of the piston 9-2 by its moving distance is pushed out from the nozzle 21.

In other words, in this embodiment, the relay 16, the control pulse oscillator 18, and the T-bis staple element 19 form a control device for the switching valve 7.8 and the coil 9-5. The piston type meter 9 is controlled by controlling the switching valve and intermittently controlling the excitation current of the coil 9-5.
It operates.

Piston-type meters have extremely high volumetric efficiency, and the volume of the fluid to be measured can be set to any value with high precision by appropriately determining the cross-sectional area or travel distance of the piston. .

In the device of the present invention, quantitative measurement is performed each time the piston makes one reciprocation, so it is possible to perform quantitative measurement of small amounts easily, with high efficiency, and with high precision.

In particular, in this embodiment, the fluid to be measured is sealed inside the device, and there is no need to use a pump, etc., which is often problematic when pressurizing the fluid. The desired fluid can be quantitatively measured efficiently, accurately, and without contamination.

Note that the configuration of the present invention is not limited to the embodiment on the ridge, and for example, the switching valve used is not limited to the spring offset electromagnetic type as shown in the figure, but may be of the mechanically operated type as described above. All other valves having equivalent functions can be substituted, and the devices for controlling these valves are also limited to those consisting of the above-mentioned relay 16, control pulse oscillator 18, T-bistable element 19, etc. In addition, the piston type meter, the shape of the fluid supply device,
Regarding the configuration, etc., the design can be freely changed using widely known components within the scope of the purpose of the present invention,
The present invention encompasses all of them.

[Brief explanation of drawings]

The drawing is an explanatory view showing one embodiment of the quantitative measuring device according to the present invention. 1------------Storage tank 2---
−−−−−−−−−−−−Fluid 3−−−−−−−−−−
−−−−−High pressure nib tank. 4---------------Pressure control valve 5------
−−−−−−−−−−−−Airline 6−−−−−−−
−−−−−−−−−Temperature control snow making 7−−−−−−−−−−
------First switching valve 8----------------------
--Second switching valve 9-----Piston type meter 9-1-------Cylinder side wall member 9-2-- -------------Piston 9-3, 9-4---Cylinder lid 9
-3a------First piping connection part 9-
3b, 9-4b------Flow hole 9-4a----
-----------Second piping connection 9-5------
---------Coil 11-----------
Fluid supply pipe 12.13------Fluid delivery pipe 14.15---Fluid transfer pipe 16-
−−−−−−−−−−−−−Relay 17−−−−−−−
-----------Power supply 18----------------------
Control pulse oscillator 19---------T
Bias table element 20---------
---Kakunta 21---------- Nozzle 22--------- Conveyor 23-
−−−−−−−−−−−−−Fluid container patent applicant Oval Equipment Industry Co., Ltd. Agent (7524) Shotabe Mogami

Claims (1)

[Scope of Claims] A quantitative measuring device characterized by comprising the components described in (a) to (d) below. (a) a cylinder defining a piston chamber therein and having first and second piping connections communicating with the piston chamber, and a piston slidably fitted into the piston chamber; and a coil provided coaxially with the cylinder and capable of attracting and holding the piston at one end of its movement when energized. (b) A device for supplying the fluid to be metered. (c) First piping w of the fluid supply device and piston meter? Fluid supply pipe that connects the connecting part. (d) A fluid delivery tube connected to the second piping connection of the piston meter. (e) A fluid transfer tube connecting the first piping connection and the second piping connection of the piston meter. (f) a first two-position valve inserted into the fluid delivery i; (g) A second Nivot two-position cut-off valve inserted into the flow collection transfer pipe. (h) A control device that operates the piston-type measuring device by intermittently energizing the coil of the piston-type measuring device and controlling the opening and closing of the first and second NIVOT position switching valves.