JPH0148970B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid precision transfer compounding device, and more particularly to a liquid transfer compounding device whose constituent liquids can be precisely metered, for example to determine the distribution of dye liquids in textiles. Regarding equipment.

In conventional well-known liquid blending devices, it was difficult to reduce the measurement error to within ±0.05 g, but with the device of the present invention, it is possible to measure to within ±0.01 g.

In addition, liquids that contain components that tend to precipitate may precipitate if there is a stagnation time in the transfer passage, which may cause discoloration or block the passage. The entire amount of liquid is retreated into the stirring container during each injection operation cycle.

Furthermore, in order to accurately measure a predetermined amount of a certain liquid composition, even more fine adjustment can be made by instantaneous ejection using pulse pressure rather than the usual dripping from a discharge capillary.

The device of the present invention is mainly suitable for use in laboratories or test factories, as described in the following embodiments, but it is of course possible to design a device with an appropriate capacity for production lines based on the same principle. It is.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure and operation of the accompanying drawings showing one embodiment of the present invention will be explained below. Fig. 1 is an overall view of the device when it is stopped, Fig. 2 is a state in which a certain liquid is injected into a collection container (or a mixing container if multiple liquids are mixed) at a normal rate, and Fig. 3 is a state in which a certain liquid is injected at a normal rate. ,
FIG. 4 is an overall view showing a state in which the liquid is being precisely transferred to the collection container, and all of the liquid after precision measurement is being withdrawn.

First, looking at Figure 1, which shows the entire device in a stopped state, the liquid 2 contained in the container 1 is always evenly distributed by the stirrer 4 at the bottom of the liquid, leaving a space 3 at the top of the container. It is being stirred. 5 shows a rotating field that rotates the stirrer induced from outside the container.

The container 1 is sealed by an upper cover 6, and a liquid pipe 7 passing through this cover 6 carries the liquid 2 in the container.
The air pipe 8 opens downward into the space 3 above the liquid level in the container.

A pressure pump 9 and a pressure reduction pump 10 associated with the air line 8 are connected to the air line 8 via conduits 11 and 12, respectively, via a switching valve 13.

The liquid pipe 7 is connected to the liquid injection pump 15 via the flexible pipe 14.
is connected to the inlet 16 of the The liquid injection pump 15 includes a cylinder 19 supported by a horizontal pin 18 on a suitable fixed part 17, and a piston 2 that slides inside the cylinder.
0 and an end cover 21, the piston rod 22 extends outwardly through the end cover 21, and has a flat plate rack 23 secured to its outer end. The liquid inlet 16 to the liquid injection pump 15 is connected to a piston 20 for switching to precision liquid injection, which will be described later.
It opens outward from the stepped portion 19' where the piston 20 starts effective operation with the inner surface of the cylinder 19, that is, in a portion where there is a gap 24 between the piston 20 and the inner surface of the cylinder 19.

At the tip of the flexible tube 26 connected to the discharge port 25 of the cylinder 19 of the liquid injection pump 15, a thin tube 27 is provided at least enough to prevent the liquid from spontaneously dripping.
It opens above 8.

The collection container 28 is supported to generate an electrical signal by an electronic scale 29, for example with an accuracy of at least 0.01 g.

Next, a description will be given of the characteristic mechanism of the present invention, that is, the mechanism of the liquid injection pump 15 for precisely injecting a predetermined amount of the liquid to be handled into the collection container.

According to the apparatus described so far, the liquid 2 in the container 1 is supplied to the container internal space 3 by pressurized air from the pressure pump 9 by switching the switching valve 13 (the position shown in FIG. 2). As a result, the fluid is injected into the collection container 28 via the flexible tube 14, cylinder 19, flexible tube 26, and discharge capillary tube 27, and the switching valve 13 is
It will be understood that by switching to the position shown in the figure, all of the liquid in the flexible tube and cylinder is returned to the container 1 by the suction of the vacuum pump 10. This is done by injecting the liquid into the collection container 28 at a normal rate, and when the planned liquid injection amount is reached, the electronic weighing device 28
This is achieved by switching (rotating in the illustration) the switching valve 13 in response to the signal 9.

Therefore, the planned injection amount of the collection container 28 is, for example,
If the first scheduled amount is set to the first scheduled amount and the second scheduled amount, and the first scheduled amount is the injection amount at the normal speed described above, the subsequent precision injection is performed as the final injection operation at the precise speed described below. It can be seen that it is sufficient to stop pouring the liquid into the collection container at the desired second scheduled amount.

The details of this device will be explained with reference to FIGS. 1 to 4 at the same time. Reference numeral 30 is an electromagnetic solenoid fixed on a fixed base 31, and a rod end frame 36 directly connected to the movable core 32. The plate rack 23 is slidably supported by rollers 35 held by the rollers 35 (only the cross section is shown schematically).

Now, when transferring the liquid 2 to the collection container 28,
By applying current to the solenoid 30, moving the movable core 32 upward, and pushing up the rack 23 directly connected to the piston rod 22 of the liquid injection pump 15,
The rack 23 is engaged with a gear 34 that is directly connected (or connected via a suitable reduction gear) to a pulse motor 33 located above. In addition, explanations of things that can be understood only by illustration, such as the piston packing 37, are omitted.

The pulse motor 33 is operated during the first stroke of the piston 20 (i.e., in FIG. During the stroke from the retracted position up to the end cover 21 as shown in FIG. 2 to the step 19' of the cylinder 19 as shown in FIG.

Before explaining the operation of the apparatus of the present invention, numerical values related to precision liquid injection in the illustrated embodiment are as follows.

The inner diameter of the liquid injection cylinder 19 is 11.4 mm, one rotation of the pulse motor 33 is 500 pulses (therefore, 0.72°/pulse), and the gear 34 is directly connected to the pulse motor shaft.
Assuming that the pitch circle diameter of is 10 mm, the stroke of the piston 20 in one pulse of the pulse motor is calculated as follows.
Since it is 0.0628 mm, the amount of liquid discharged from the cylinder 19 by the piston 20 in one pulse is π/4×11.4 ² ×0.0628=6.41 mm ³ .

Further, by using an electronic scale 29 having an accuracy of about 1 mg, the amount of liquid injected by pulses can be measured within ±0.01 g.

Having described the overall configuration of the apparatus of the present invention, the general operation thereof can be understood, but the overall operation sequence will be explained as follows.

FIG. 1 shows the entire apparatus in a rest state, in which the liquid 2 to be transferred to the collection container 28 is stirred by the stirrer 4 in the container 1 and maintained at a uniform density.

In order to transfer the liquid 2 in the container 1 to the collection container 28, the electromagnet 30 is first activated to engage the rack 23 of the piston rod with the gear 34 of the pulse motor 33, and the air switching valve 13 is turned on to supply air. When the switch is switched to the in position (FIG. 2), air from the pressurizing pump 9 is forced into the upper space 3 inside the container 1.
The liquid 2 inside is a liquid pipe 7, a flexible pipe 14, a gap 24,
It is discharged from the capillary tube 27 via the cylinder 19 and the flexible tube 26, and is injected into the collection container 28 at a relatively high rate. At this time, the piston 20 is in its retracted position as shown in FIG.
0 and the inner surface of the cylinder.

Next, when the liquid in the collection container 28 reaches a certain intermediate planned amount (to proceed to precision injection from now on),
A signal generated by the electronic scale 29 causes the pulse motor 33 to rapidly rotate to advance the piston 20 to the position for precision injection, that is, to the cylinder step 19'. At this time, the pressurization of the liquid by the pressurizing pump 9 is maintained, but the injection of the liquid at the normal rate is interrupted here.

From then on, approximately 0.0064g of liquid is applied for each pulse of the pulse motor 33 (actually approximately 0.007 to 0.008g).
is injected into the collection container 28. FIG. 3 shows the state during this precision injection.

In the figure, only one collection container or compounding container 28 is shown, but by arranging any plurality and also arranging a plurality of liquid transfer devices similar to FIG. 1, it is possible to transfer a plurality of various liquids. It is possible to transfer different formulations to separate formulation containers, which is achieved by computer-controlled control of the switching valve 13, solenoid 30 and pulse motor 33, but the details are Since it is not directly related to the present invention, it will be omitted here.

Next, when the precision injection operation is completed, the pulse motor 33 is reversed at high speed as shown in FIG. 4, and the rack 23 and piston 20 are retreated to the same position as in FIG. 2 (FIG. 4). Flexible tubes 14, 26
All of the liquid in the cylinder 19 flows back into the container 1. Therefore, the liquid does not settle in the flexible tube or cylinder every time the required amount is injected into the collection container, and the density (related to concentration and color) of the liquid injected into the collection container is always maintained at a predetermined value. can be maintained.

As described above, according to the device of the present invention, a large amount of liquid can be transferred quickly and precisely in quantity by combining mass transfer using a pressurized pump and precision transfer using a pulse motor-driven piston. It has a unique technical effect of obtaining.

Furthermore, since all the liquid remaining in the cylinder and liquid transfer pipe is returned to the original container after the liquid transfer is completed, it is possible to prevent dyes and the like from settling.

[Brief explanation of drawings]

FIG. 1 is an overall view showing the liquid precision transfer device of the present invention in a rest state, FIG. 2 is an overall view similar to FIG. 1 showing a normal transfer state, and FIG. 3 is a state during precision transfer. FIG. 4 is an overall view showing a backflow state of liquid after a predetermined amount of liquid has been injected. DESCRIPTION OF SYMBOLS 1...Liquid container, 2...Liquid, 3...Inner space of container, 4...Stirrer, 5...Rotating field, 6...Top cover, 7...Liquid pipe, 8...Air pipe, 9 ...Pressure pump, 10...Decompression pump, 11,12...
Conduit, 13...Switching valve, 14...Flexible pipe, 15...
... Liquid injection pump, 16 ... Pump inlet, 17 ... Fixed part, 18 ... Horizontal pin, 19 ... Cylinder, 1
9'... Cylinder stepped section, 20... Piston, 21
...End cover, 22 ...Piston rod, 23
... Flat plate rack, 24 ... Gap, 25 ... Discharge port, 26 ... Flexible tube, 27 ... Liquid injection thin tube, 28 ...
...Collection container, 29...Electronic scale, 30...Electromagnet, 31...Fixed stand, 32...Movable iron core, 33...
...pulse motor, 34...gear, 35...roller, 36...iron core rod end frame, 37...packet.

Claims (1)

[Claims] 1. A flexible tube 1 connected to a container 1 containing a fluid.
4, a flexible tube 26 that injects liquid into another container 28, and a cylinder 19 that connects both the flexible tubes 14 and 26,
A device having a piston 20 driven by a pulse motor 33 and slidingly fitted into the cylinder 19, creating a gap 24 between the piston 20 and the cylinder 19 when in a position further retracted from the fitted position. The piston 20 is retreated to a position where the gap 24 is created, and a large volume of liquid is measured and injected under pressure by the pressure pump 9, and the piston 20 is advanced to a position where the gap 24 is not created. This is a liquid precision transfer and blending device characterized by a combination of a precision transfer process in which pulse injection is performed while measuring a minute amount. 2 After the precision transfer step, the piston 2
0 to a position where the gap 24 is created, and the liquid in the cylinder 19 and the flexible tubes 14 and 26 is transported back to the container 1 by a vacuum pump 10. 1. The liquid precision transfer and blending device according to 1.