JPH0477630B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a quantitative supply valve that has dual functions of large quantity supply and small quantity (or trace quantity) supply. Automatic supply of dye solution in color mixing equipment, automatic mixing of ink, paint, etc.
Alternatively, the present invention relates to a metered supply valve that can be applied to a wide range of applications such as metered mixing of various chemical solutions.

(Prior Art) Conventionally, the color of a dye liquor has been adjusted by manually measuring and mixing powder dyes of several colors based on a given color sample. For this reason, although it requires considerable skill and time, the color matching accuracy is not perfect and the reproducibility is insufficient, so several corrections are required to match the color of one color paste. Ta.

In recent years, computer color matching devices and the like have become widespread, and color analysis has come to be automatically performed on color samples, and automatic color matching devices are also being put into practical use. That is, based on the weight of raw materials analyzed by a computer color matching device, the dye stock solution is dissolved to a certain concentration and stored in a tank, and a predetermined amount is drawn out into a measuring container.
Supply control of the dye stock solution is generally performed using a solenoid valve.

(Problems to be solved by the invention) However, dye stock solutions have problems in terms of measurement efficiency.
It is desirable to use a highly concentrated liquid, and it generally has a high viscosity ranging from several hundred to several thousand centipoises. Therefore, it is difficult to perform faithful and precise opening and closing operations, that is, starting and stopping the supply, with solenoid valves. be. In addition, even after the liquid supply is cut off, the raw liquid may drip from the supply port and contaminate the measuring device.
Alternatively, there is often a disadvantage that measurement accuracy is reduced.

Such drawbacks occur not only in the automatic color mixing of dye solutions, but also in the automatic mixing of inks, paints, etc., quantitative blending of various chemical solutions, and the like.

Therefore, the technical problem of the present invention is to enable smooth and accurate opening/closing operations even when the liquid to be supplied has high viscosity and high pressure, and to perform dual functions of large-volume supply and small-volume supply. To provide a metered dispensing valve.

Other technical problems of the present invention are that, while having the above-mentioned functions, the structure is extremely compact and integrated, the operation is reliable, there are few failures, and the present invention is resistant to liquids containing flammable or flammable components. It also provides a metering valve that can be used.

Still another technical object of the present invention is to provide a metered supply valve in which dripping of liquid is prevented by so-called suction.

(Means for solving the problem) In the quantitative supply valve of the present invention, the casing 1
A large-diameter opening/closing plunger 2 and a small-diameter opening/closing plunger 3 are provided in the casing coaxially with each other, slidable in the axial direction, and telescopically. A small quantity supply nozzle 5 is arranged coaxially with the large quantity supply nozzle 4 and one end of the large diameter plunger 2, and a small quantity supply nozzle 5 is disposed coaxially with the large quantity supply nozzle 4 and one end of the large diameter plunger 2. A liquid supply port 19 is provided which is connected to the small-volume supply nozzle 5 through the liquid passage section 26 of the small-diameter plunger 3, and is connected to the large-diameter plunger 2 and connected to the large-volume supply nozzle 4 at the other end of the casing 1. A large air cylinder mechanism 6 that drives the large diameter plunger 2 between an open position on the side of the small amount supply nozzle 5 and a closed position on the opposite side, and a large air cylinder mechanism 6 that is connected to the small diameter plunger 3 and between the open position on the side of the small quantity supply nozzle 5 and the closed position on the opposite side. A small air cylinder mechanism 7 for driving a small diameter plunger is provided between the two. Preferably, a small air cylinder 7 is connected coaxially and in series between the piston rod 37 of the large air cylinder 6 and the large diameter plunger 2, and the large quantity supply nozzle 4 and the small quantity supply nozzle 5 are respectively connected to the casing 1. It is preferable that the large-diameter plunger 2 is provided so as to be replaceable.

Furthermore, each of the large air cylinder 6 and the small air cylinder 7 continues to move beyond the closed position of the large diameter plunger 2 and the small diameter plunger 3, and the liquid is supplied to each of the large quantity supply nozzle 4 and the small quantity supply nozzle 5. Preferably, the stroke range is set to prevent backlash.

(Function) In the quantitative supply valve of the present invention, a large-volume supply nozzle, a small-volume supply nozzle, and a large-diameter plunger and a small-diameter plunger for opening and closing these passages are provided coaxially and integrally within the casing. Therefore, a valve with dual functions of large quantity supply and small quantity supply is compactly integrated.

Moreover, since the large-diameter plunger and small-diameter plunger for opening and closing are operated by air pressure, it is possible to use even high-viscosity or high-pressure liquid as the supply liquid, and the timing of the opening and closing operation may be delayed. It can be performed accurately and reliably without any problems, and there are few failures.

Furthermore, after the liquid supply is completed, both the large-diameter plunger and the small-diameter plunger move away from the nozzle, creating a negative pressure inside the nozzle, which is a so-called suction effect, which effectively prevents the liquid from dripping from the nozzle. Ru.

Furthermore, the tip nozzle can be replaced at will with one having a suitable diameter and shape depending on the viscosity of the liquid to be supplied and other factors. Moreover, since the quantitative supply valve of the present invention does not have any electrical elements, it can be safely applied to oil-based and solvent-based products.

(Example) Structure In FIG. 1 showing an example of the metered supply valve of the present invention, this metered supply valve roughly speaking consists of a casing 1; a large-diameter opening/closing plunger 2 provided in the casing 1; A small diameter opening/closing plunger 3 disposed within the large diameter plunger; a large quantity supply nozzle 4 attached to one end of the casing 1; a small quantity supply nozzle 5 attached to one end of the large diameter plunger 2; provided at the other end of the casing 1. It consists of a large air cylinder 6 for driving a large plunger and a small air cylinder 7 for driving a small plunger, which are housed in a cover case 9.

The casing 1 is made of a hollow cylindrical body, and one end thereof is provided with a large screwed nozzle attachment part 10, and the other end has a flange 11 for attaching a cover. On the inner surface of the casing 1, there is a liquid passage section 12 with a large inner diameter on the nozzle installation side.
On the opposite side there is a large plunger 2 and a slidable cylindrical portion 13 with a small diameter.

The large-diameter opening/closing plunger 2 also consists of a hollow cylindrical body as a whole, and one end thereof is provided with a small-diameter threaded tip 14 for attaching a small nozzle, and the other end is provided with a small-diameter threaded tip 14 for connecting to a small air cylinder. A flange portion 15 is provided. The cylindrical portion of the large plunger 2 includes a large diameter tip 16 and a large diameter root 1.
7, and a small diameter liquid passage section 18 is provided between the two. The large-diameter tip portion 16 and root portion 17 are housed within the casing 1 so as to slide on the cylindrical portion 13 of the casing 1 .

A threaded liquid supply port 19 is provided between the flange portion of the casing 1 and the nozzle mounting portion. Moreover, the cylindrical portion 13 of the casing 1
Two O-rings 20a, 20b are provided on the nozzle side and flange side of the large plunger 2.
Liquid-tight sealing is possible between the large-diameter tip portion 16 and the O-ring 20a and between the large-diameter root portion 17 and the O-ring 20b.

On the inner surface of the large plunger 2, there is a liquid passage section 2 with a large diameter on the nozzle installation side, and a space 22 with a large diameter on the opposite side. small cylindrical part 23
There is. The small-diameter opening/closing plunger 3 is made of a cylindrical member as a whole, and has a large-diameter tip 24 and a large-diameter root 25, with a small-diameter liquid passage section 26 provided between the two. The large-diameter tip portion 24 and root portion 25 are housed within the large plunger 2 so as to be able to slide on the cylindrical portion 23 of the large plunger 2.

The small-diameter liquid passage portion 18 of the large plunger 2 is provided with a liquid communication port 27 that penetrates toward the inner surface of the large plunger 2, and the inner surface of the cylindrical portion 23 of the large plunger 2 is provided with a nozzle side and a flange. Two O-rings 20c and 20d are provided on the sides, and liquid-tight is provided between the large diameter tip 24 of the small plunger 3 and the O-ring 20c and between the large diameter root 25 and the O-ring 20d. It is now possible to seal the

The large discharge nozzle 4 is provided with a large diameter orifice 28, and the small discharge nozzle 5 is provided with a small diameter orifice 28.
Nine rods are provided, and these are arranged coaxially. It will be understood that the large plunger 2 and the small plunger 3 are provided coaxially and slidably in the axial direction within the casing 1, and that the large plunger 2 and the small plunger 3 are also slidable relative to each other. .

The liquid passage section 18 of the large plunger 2 is connected to the liquid supply port 1
On the other hand, the liquid passage section 26 of the small plunger 2 is connected to the liquid supply port 19 through a liquid communication port 27 provided in the large plunger. In the state shown by the solid line, the liquid passage section 1 of the large plunger 2
8 is closed by the engagement between the large diameter tip 16 and the O-ring 20a, and the liquid passage section 26 of the small plunger 3 is also closed by the engagement between the large diameter tip 24 and the O-ring 20c. .

The large plunger 2 is movable with a stroke of S ₁ from the valve-closed position shown by the solid line in the drawing to the valve-open position shown by the two-dot chain line.
Since the large diameter tip 16 of the large plunger 2 moves into the large diameter liquid passage section 12 of the casing 1, the liquid passes through the liquid supply port 19, the liquid passage section 18, and the liquid passage section 12, and is discharged from the large diameter orifice 28. will be done.

Similarly, the small plunger 3 can be moved with a stroke of S ₂ from the closed position shown by the solid line in the drawing to the open position shown by the two-dot chain line. Since the tip portion 24 moves into the large diameter liquid passage section 21 inside the large plunger 2, the liquid passes through the liquid supply port 19, the liquid communication port 27, the liquid passage section 26, and the liquid passage section 21, and then flows from the small diameter orifice 29. It will be discharged.

Inside the cover case 9, a small air cylinder 7 for driving a small plunger and a large air cylinder 6 for driving a large plunger are provided with the following mechanism. First, flange 15 of large plunger 2
A small air cylinder 7 is fixed to the holder with fastening means such as bolts 30. Further, the small air cylinder 7 is provided with a piston 31 that can reciprocate by a stroke _S2 , and the piston rod 32 is attached to the root portion 25 of the small plunger 3 at the position of the large diameter space 22 of the large plunger mentioned above. On the other hand, Natsu 33
It is concluded by means such as.

The large air cylinder 6 is fixed to a pedestal 34 fixed in the cover case 9 by a fastening means such as a bolt 35, and a piston 36 that can reciprocate by a stroke S ₁ is provided inside the large air cylinder 6. ing. A small air cylinder 7 is connected to a piston rod 37 fixed to this piston 36 via a spacer 8. The large air cylinder 6 is provided with an air nipple 39 for the valve opening stroke and an air nipple 40 for the valve closing stroke, which are connected to the air tube 38. Similarly, for the small air cylinder 7, the air tube 41
An air nipple 42 for the valve opening stroke and an air nipple 43 for the valve closing stroke are provided, which are connected to the valve opening stroke.

It will thus be clear that in the embodiment shown in the drawings, the large air cylinder 6 and the small air cylinder 7 are also arranged coaxially with the plungers. Further, the small air cylinder 7 is connected in series between the piston rod 37 of the large air cylinder 6 and the large plunger 2, and as the piston rod 37 of the large air cylinder 6 moves in stroke, the small air cylinder 7 also connects to the large plunger. It will also be clear that the stroke movement can be made with 3.
In order to enable stroke movement of the small air cylinder 7, a long hole 44 is provided in the cover case 9, and air nipples 42, 43 are provided in the small air cylinder 7 through this long hole 44. . It will also be clear that as the piston rod 32 in the small air cylinder 7 strokes, the small plunger 3 can move relatively in strokes within the large plunger 2.

A liquid feeding manifold 45 is attached to the liquid supply port 19 of the casing 1.
In contrast, the liquid sending pipe 46 and the return pipe 4
7 is provided and by constantly circulating the liquid,
Care is taken to prevent the formation of precipitates and other changes in the quality of the liquid.

Operation The quantitative supply valve of the present invention is driven and controlled by air pressure, and the operation of each cylinder is controlled by a solenoid valve (not shown) located at a different location.

First, the metered supply valve is in the operation stop position shown, and even in this case, liquids such as dye liquid, paint, ink, etc. are in a circulating state from the liquid sending pipe 46 through the return pipe 47.

Large air cylinder 6 is activated by the supply start signal.
Air pressure is supplied through the valve opening stroke air nipple 39 to move the piston 36 and therefore the piston rod 37 downward (to the left in the figure). The small air cylinder 7 integrally connected to this and the large plunger 2 connected to this also move downward (to the left in the figure), and the liquid passage 18 and liquid passage 12 communicate with each other, passing through the large diameter orifice 28. A large amount of liquid is supplied. In this case, the small air cylinder 7 does not operate, but the piston rod 32 of the small air cylinder 7 and the small plunger 3 integrally connected thereto also move in the same way as the large plunger 2 while maintaining the positional relationship shown in the figure. The liquid passage 26 of the plunger 3 is in a closed state.

Upon receiving the signal indicating the completion of the large amount supply, the air nipple 40 for the valve closing stroke is activated for the large air cylinder 6.
Air pressure is supplied through the piston rod 3.
7. Move the small air cylinder 7 and large plunger 2 back upwards (to the right in the figure). In this case, since air pressure is still being supplied to the small air cylinder 7 through the air nipple 43 for the valve closing stroke, the piston rod 32 of the small air cylinder 7 and the small plunger 3 also have the same positional relationship as the large plunger 2. Move back while holding.

Next, air pressure is supplied to the small air cylinder 7 through the air nipple 42 for the valve opening stroke in response to a small amount (trace amount) supply signal, and the piston 3
1. Move the piston rod 32 and the small plunger 3 integrally connected thereto by a stroke S ₂ downward (to the left in the figure). As a result, the liquid passage 26
and the liquid passage 21 are connected, and the small diameter orifice 29
A small amount (trace amount) of liquid is supplied through.

At the stage when the desired precise quantity has been supplied, air pressure is supplied to the small air cylinder 7 through the valve closing stroke nipple 43 in response to this end signal, and the air pressure is supplied to the small air cylinder 7 above the piston rod 32 and the small plunger 3 ( The return movement to the right side in the figure is performed, the liquid passage 26 is closed, and the supply operation is completed.

When both the large plunger 2 and the small plunger 3 return upward, their retracting action causes the liquid passage 12 and the liquid passage 21 to become negative pressure due to volume expansion, and due to the so-called suction action, the liquid is removed from the orifice 28 and the orifice 29. This will prevent the liquid from dripping.

In the embodiment shown in FIG. 1, the valve is opened by the downward movement of each plunger 2, 3 (movement to the left in the figure), and the valve is closed by the upward movement of each plunger 2, 3 (movement to the right in the figure). However, it goes without saying that the movement of the plungers 2 and 3 and the opening/closing valve operation can be performed in the reverse order.

In another embodiment shown in FIG. 2, the orifice surface (inner surface 28) of the large-volume discharge nozzle 4 and the outer surface 48 of the small-volume (trace) discharge nozzle 5 are slidably provided. Amount (trace amount) discharge nozzle 5
On the outer surface 48 of the
- A ring 20e is provided.

In the state shown in the figure, the large plunger 2 is at the lowest position (the leftmost position in the figure), and between the large diameter tip 16 of the large plunger and the casing 1, and between the large nozzle 4 and the small nozzle 5. The liquid passages 12 and 18 are respectively blocked. From this state, the large plunger 2 moves upward (moves to the right in the figure), the orifice 28 opens, and the passages 12 and 18
By contacting them, large quantities can be supplied.
In the illustrated embodiment, the most advanced orifice 2
Since the liquid is shut off at position 8, the operation can be performed reliably even with high viscosity liquid, and dripping of the liquid is also prevented.

A small-diameter orifice 29 is provided inside the nozzle 5 for discharging a small amount (trace amount), as in the case of FIG. A packing 49 is provided which is engageable with the.

In the illustrated state, the small plunger 3 is also in the lowest position (the leftmost position in the figure), and there is a gap between the leading edge 50 of the small plunger and the packing 49, and between the large diameter root portion 25 of the small plunger and the through hole 27. The liquid passage 26 is blocked between the two. From this state, the small plunger 3 moves upward (moves to the right in the figure), the orifice 29 opens, and the through hole 27
By locating the passage 26 in the
supply becomes possible.

(Operations and Effects of the Invention) According to the quantitative supply valve of the present invention, the dual functions of large quantity supply and small quantity (trace amount) supply can be reliably performed by stroke movement using air pressure of compact parts arranged coaxially. It has many advantages: it can be performed with high precision, has few failures, is excellent in safety, and also prevents liquid from dripping from the nozzle.

[Brief explanation of the drawing]

FIG. 1 is a sectional side view of one embodiment of the quantitative supply valve of the present invention, and FIG. 2 is a partially sectional side view of another embodiment. 1 is a casing, 2 is a large plunger, 3 is a small plunger, 4 is a large nozzle, 5 is a small nozzle, 6
is a large cylinder and 7 is a small cylinder.

Claims (1)

[Claims] 1. A casing 1, a large-diameter opening/closing plunger 2 and a small-diameter opening/closing plunger 3 provided coaxially with each other in the casing so as to be able to slide in the axial direction and in a telescoping manner. A large-volume supply nozzle 4 is disposed coaxially at one end of the casing 1 and a small-volume supply nozzle 5 is disposed coaxially at one end of the large-diameter plunger 2. A liquid supply port 1 which is connected to the large quantity supply nozzle 4 through the liquid supply nozzle 4 and connected to the small quantity supply nozzle 5 through the liquid passage section 26 of the small diameter plunger 3.
9 is provided at the other end of the casing 1, and a large air cylinder mechanism is connected to the large diameter plunger 2 and drives the large diameter plunger 2 between an open position on the mass supply nozzle 4 side and a closed position on the opposite side. 6 and a small air cylinder mechanism 7 connected to the small diameter plunger 3 and driving the small diameter plunger between an open position on the side of the small quantity supply nozzle 5 and a closed position on the opposite side. valve. 2 A small air cylinder 7 is installed between the piston rod 37 of the large air cylinder 6 and the large diameter plunger 2.
2. The metering valve according to claim 1, wherein the valves are connected coaxially and in series. 3. The quantitative supply valve according to claim 1, wherein the large quantity supply nozzle 4 and the small quantity supply nozzle 5 are provided replaceably with respect to the casing 1 and the large diameter plunger 2, respectively. 4 Large air cylinder 6 and small air cylinder 7
each of the large diameter plunger 2 and the small diameter plunger 3 continue to move beyond the closed position,
2. The quantitative supply valve according to claim 1, wherein each of the large quantity supply nozzle 4 and the small quantity supply nozzle 5 has a stroke range set so as to prevent liquid back-up.