JPH0236333A - Device for sampling suspended liquid for measuring particle size distribution - Google Patents

Abstract

PURPOSE:To accomplish effective sampling by selecting either a bus system or a beaker system in one sampling device. CONSTITUTION:In the case of applying the bus system, a channel switching valve 13 is set so that a tube 8c communicates with an entrance 12 for the liquid of a measur ing system and suspended liquid L is inducted in the bus 1. When a liquid feeding pump 9 is driven in a state where an ultrasonic oscillator 2 and a stirring device 3 are driven, the liquid L is made to cycle, such as the measuring system the pump 9 the tube 8a a discharging pipe 6 the bus 1 the value 13 the measuring system. In the case of applying the beaker system, the device 3 and sucking and discharging pipes 5 and 6 are respectively moved upward by holders 4a and 7a and a beaker placing table 10 is mounted in the bus 1, then a beaker B containing the liquid L is placed on the table 10. Water for transmitting ultrasonic wave is injected in the bus 1. Next, the device 3 and the pipes 5 and 6 are moved downward to be immersed in the beaker B and the valve 13 is set so that a tube 8b communicates with the entrance 12 for the liquid of the measuring system. By driving the oscillator 2, the device 3 and the pump 9 in such a state, the liquid L can be cycled in the measuring system.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a liquid-phase particle size distribution measuring device based on a laser diffraction method, a light scattering method, a liquid-phase sedimentation method, etc. , relates to a sampling device for dispersing and feeding liquid to a measurement system.

<Prior Art> In all of the particle size distribution measurement apparatuses based on the above-mentioned measurement methods, particle size distribution is measured using a suspension in which the powder to be measured is uniformly dispersed in an appropriate medium.

Devices for sampling such suspensions include (
a) Pump and piping for liquid feeding, (magnetic stirrer or propeller stirring device for stirring BL liquid, (
An ultrasonic oscillator for C1 particle dispersion, and a (dl sample tank) are all required.

The configuration of a conventional sampling device of this type is shown in FIGS. 6 to 8.

The apparatus shown in FIGS. 6 and 7 is a type that uses a container such as a beaker B as a sample tank, and the beaker B containing a sample suspension is placed in a bath 62 equipped with an ultrasonic oscillator 61. Then, the suspension is irradiated with ultrasonic waves through the liquid filled in the bath 62. In addition, the suspension in beaker B can be mixed with a propeller stirrer 63 (Fig. 6) or with a stirrer 71.
Magnetic star rough 1 consisting of a and motor 71b
(Fig. 7), the suction and discharge vibros 4 and 65 are immersed in the suspension, and the pump 6
6 to circulate between the measurement system and the measurement system.

On the other hand, the apparatus shown in FIG.
The suspension dispersed by ultrasonic waves in the bath 82 and stirred by the stirrer 83 is transferred to the bath 82 by the drive of the pump 84.
It is sucked in from an outlet 82a provided on the lower surface, passes through a measurement system, and is returned into the bath 82 by a return pipe 85 that opens above the bath 82.

<Problems to be Solved by the Invention> Among the conventional sampling devices described above, the types shown in FIGS. 6 and 7 are superior to the type shown in FIG. 8 in terms of operability, but on the other hand, Large particles or particles with extremely large diameters are difficult to attract, and only relatively fine particles tend to be introduced into the measurement system, which may cause measurement errors. This point can be improved by improving the capacity of the pump 66, but this may cause air bubbles to easily get mixed into the suspension, or the joints of the piping system will need to be pressure resistant, etc. A new problem arises.

In addition, although the type shown in Figure 8 does not have the above-mentioned tendency,
In addition to requiring a relatively large amount of suspension, a sample tank (
There are drawbacks such as difficulty in cleaning the bus 82).

Furthermore, as shown in Figure 7, magnetic star rough There is a problem in some cases.

Means for Solving the Problems> In view of these points, the present invention aims to provide a device that can perform more efficient sampling according to the measurement purpose and conditions, and the present invention has the following features: To explain with reference to FIGS. 1 to 3 corresponding to examples, in the present invention,
A bea force platform 10 is removably provided inside a bus 1 which is provided with a liquid outlet 1a on the bottom surface and can be irradiated with ultrasonic waves by an ultrasonic oscillator 2. A stirring device 3 is placed in the beaker B from above the bath 1.
．． Insert the suction pipe 5 and the discharge vibro,
The structure is such that the support height of the two is variable. and,
The liquid outlet 11 of the measuring system is connected to a discharge vibro, and the liquid inlet 12 of the measuring system is connected to a piping system (which can selectively connect either the suction pipe 5 or the liquid outlet 1a of the bath 1). 8a.

8b, 8c and a flow path switching pulp 13) are provided, and a liquid feeding pump 9 is disposed within this piping system.

Effect> By storing the suspension liquid in the bath 1 with the liquid outlet 1a of the bath 1 communicating with the liquid inlet 12 of the measurement system,
The shape C,) in FIG. 1 is the same type as the conventional type shown in FIG. 8 described above.

In addition, a beaker B or the like containing the suspension is placed on the beaker 10 installed in the bus 1, and the stirring device 3 is placed inside the beaker B. While immersing the suction and discharge pipes 5 and 6 (the state shown in Figure 3), insert the suction pipe 5 into the liquid inlet 12 of the measurement system.
By communicating with each other, a type equivalent to the conventional type shown in FIG. 6 is obtained. Note that the bee force B is attached to and removed from the bath 1 using the stirring device 3. This is possible because the support height of the suction and discharge pipes 5 and 6 is variable.

By being able to use two different types at any time in this way, it is possible to perform optimal sampling according to the measurement purpose and conditions.

<Embodiment> FIG. 1 is an overall configuration diagram of an embodiment of the present invention, and is shown in a state where a bus system (described later) is selected. Further, FIG. 2 is an explanatory diagram of a bead force mounting table 10 that is detachably disposed within the bus 1.

An ultrasonic oscillator 2 consisting of an ultrasonic oscillator 2a and its drive circuit 2b is attached to the bath 1, which has a liquid outlet 1a at the lower end of the funnel shape, and is capable of irradiating ultrasonic waves to the liquid inside. can.

A stirring device 3 consisting of a propeller 3a and its drive motor 3b is inserted into the bus 1 from above the bus 1, and the stirring device 3 can change its support height relative to the bus 1 by a stirring device support mechanism 4. Can be done.

That is, the stirring device 3 is supported by a vertical support 4b via a holder 4a, and the holder 4a is slidable along the support 4b and is attached to the support 4b at at least two height positions. Can be clamped.

A suction pipe 5 and a discharge vibro are inserted into the bath 1 from above the bath 1, and the height of these with respect to the bath 1 can be changed by a pipe support mechanism 7 as well.

That is, the suction pipe 5 and the discharge vibro are fixed to a common holder 7a, and this holder 7a is slidable along the vertical support 7b, and is attached to the support 7b at at least two height positions. Can be clamped.

The discharge vibro is connected to the discharge port of a liquid feed pump 9 through a pipe 8a, and the suction port of this liquid feed pump 9 is connected to a liquid outlet 11 of the measurement system.

Further, the suction pipe 5 is connected to the liquid inlet 12 of the measurement system via a flow path switching valve 13 by a pipe 8b.

A branch pipe 14 is attached to the liquid outlet 1a of the bath 1 described above, and one branch of the branch pipe 14 is connected to the on-off valve 1.
5 to the drain pipe 16, and the other branch is connected to the liquid inlet 12 of the measuring system via the flow path switching valve 13 by a pipe 8c.

The flow path switching valve 13 can selectively connect either the liquid outlet 1a of the bath 1 or the suction pipe 5 to the liquid inlet 12 of the measurement system.

The tubes 8a and 8b are at least partially formed of flexible tubes, such as silicone tubes.

Now, the bus 1 shown in FIG. 1 can be removably mounted therein with a bead force platform 10 as shown in FIG. 2. As shown in FIG. 2, the bee force platform 10 consists of a disk 10a with a large number of small holes and a plurality of hooks 10b...10b fixed to the outer edge of the disk 10a. Hook 10b...10 on the outer edge of the upper end
By multiplying by b, the disc 10a is suspended at an appropriate height within the bus 1.

Next, we will explain how to use it.

In the embodiment of the present invention described above, the bus 1 is
It is possible to select either a method in which the sample tank itself is used as a sample tank (hereinafter referred to as the bus method) or a method in which a bee force or the like is used as a sample tank (hereinafter referred to as the bee force method).

When adopting the bus method, the flow path switching valve 13 is connected to pipe 8C.
and the measurement base liquid volume 12 are set so that they are in communication with each other, and the suspension liquid is poured into the bath 1 as shown in FIG. In this state, if the ultrasonic oscillator 2 and stirrer 3 are driven and the liquid feeding pump 9 is driven, the dispersed and stirred suspension will be distributed between the measurement system - pump 9 - pipe 8a - discharge pipe 6 - bus 1. - Pipe 8C - Flow path switching valve 13 → It will circulate to the measurement system, and the 8th
This is equivalent to the conventional device shown in the figure.

When adopting the bee force method, the agitation device 3 and the suction and discharge pipes 5.6 are moved upward by the slides of the respective holders 4a and 7a and then clamped, and the bee force mounting table 1o is installed in the bath 1. and on top of that suspension I2
Place beaker B etc. containing . Note that water for ultrasonic transmission is injected into the bath 1. Next, the stirring device 3, the suction pipe 5, and the discharge vibro are each moved downward and immersed in the beaker B. The main part of this state is not shown in FIG.

Then, the flow path switching valve 13 is connected to the pipe 8b and the measurement base liquid population 1.
Set so that 2 is connected. If the ultrasonic oscillator 2, stirring device 3, and liquid sending pump 9 are driven in this state, the suspension will be adjusted to the measurement system - pump 9 - pipe 8a -> discharge pipe 6 - beaker B = suction pipe 5 - pipe 8b - Flow path switching valve 13-
It circulates to the measurement system, making it equivalent to the conventional device shown in FIG.

In the above embodiment, the stirring device 3 and the suction and discharge pipes 5 and 6 are moved and clamped by the measurer's operation, but the holders 4a and 7a are moved in conjunction with the flow path switching valve 13. It can also be configured to automatically unclamp, move and clamp. Moreover, it is of course possible to support the stirring device 3 and the suction and discharge pipes 5 and 6 by one support mechanism, and to perform vertical movement and clamping together.

Furthermore, in addition to the suspended structure shown in FIG. 2, the bee force platform 10 may also be supported on the bottom surface of the bus 1, as shown by numeral 20 in FIG. 4, for example.

Furthermore, as a stirring device, in addition to a propeller stirring device, an input type ultrasonic homogenizer 30 as shown in FIG.
can be used. However, in this case, the particles tend to break down (fragmentation), so the use is limited.

<Effects of the Invention> As explained above, according to the present invention, it is possible to easily select either the bus method or the peak force method with one sampling device, so that it is possible to easily select either the bus method or the peak force method with one sampling device. The most efficient sampling can be performed accordingly.

In other words, for example, when the amount of sample is small, the Pea force method,
If you want to increase the sampling amount to reduce sampling errors as much as possible, choose the bus method, or if you want to measure large particles more accurately, choose the bus method, or choose the bus method if you want to measure small particles or the amount of medium used. When there are restrictions and it is desired to measure a large number of samples in a short time, it is possible to use various methods such as the pea-force method, thereby increasing the efficiency of particle size distribution measurement work.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram of an embodiment of the present invention in which a bus system is adopted, Fig. 2 is an explanatory diagram of a bee force mounting table 10 that can be attached and detached within the bus, and Fig. 3 is a diagram in which a p force system is adopted. 1 is a configuration diagram of main parts of an embodiment of the present invention shown in a state where FIGS. 4 and 5 are diagrams showing the main parts of other embodiments of the present invention, respectively. FIG. 6, FIG. 7, and FIG. 8 are explanatory diagrams of conventional devices. 1 ・ ・ 1 a ・ ・ 2 ・ ・ 3 ・ ・ 4 ・ ・ 5 ・ ・ 6 ・ ・ 7 ・ 8a. 9 ・ 10 ・ 11 ・ 12 ・ 13 ・ B ・ L ・ Bath liquid outlet Ultrasonic oscillator Stirring device Stirring device support mechanism Suction pipe Discharge pipe Pipe support mechanism b 3c... Pipe feed night pump. Bee force mounting table measurement system Liquid outlet measurement system Liquid inlet flow path switching valve Bee force 4%, i (((Figure 2Figure 1

Claims (1)

[Claims] A device for supplying a suspension obtained by dispersing a powder to be measured in a medium to a measurement system of a liquid-phase particle size distribution measuring device, which is equipped with a liquid outlet on the bottom surface and is equipped with an ultrasonic A bus capable of irradiating the inside with ultrasonic waves by an oscillator, a removable beaker mount inside the bus, and a beaker that is inserted from above into the bus or the beaker on the beaker mount from above, and whose support height is A variable-strength stirring device, a suction pipe, a discharge pipe, and the discharge pipe are connected to the liquid outlet of the measurement system, and either the suction pipe or the liquid outlet of the bath is connected to the liquid inlet of the measurement system. A suspension sampling device for particle size distribution measurement, characterized by comprising a piping system that can be selectively communicated with, and a liquid sending pump disposed within the piping system.