JPH0975697A - Agitator for liquid mixed with powdery sample - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an agitator which can adequately agitate liquid mixed with a powdery sample insoluble in a solvent and control the absorption of carbon dioxide gas in the air into the solvent by reducing the degree of aeration of the solvent by the agitation of the liquid. SOLUTION: A-rod shaped rotor 14 is set hangingly to the lower end of a rotary rod 12, the upper half of the rotor is formed by a curved surface to make part of the surface of a cylinder, the lower half of the rotor is formed by a plane in a shape of a triangle pole or a plane, and the rotor is inserted into a container 16 so that the lower end approaches or contacts the inner bottom surface of the container.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to fly ash,
In solid state samples such as incineration residue, sludge, and cement solidified substances, the amount of inorganic elements such as lead, cadmium, chromium, and arsenic may be eluted (availability test). The present invention relates to a stirring device for a liquid containing a granular sample, which is used for stirring a liquid in which a solid sample in a granular state is mixed in a solvent in order to elute.

[0002]

2. Description of the Related Art When waste such as fly ash, incineration residue, sludge and cement solidification is left outdoors, rainwater causes toxic heavy metals such as lead, cadmium, chromium and arsenic to elute from the waste. , May cause environmental pollution. Therefore, in order to understand the elution behavior of the inorganic component from the waste, a test called an availability test for measuring the elution possible amount of the specific component from the solid sample is performed. In this test, the solid sample is finely crushed into powder and granules, the powdered and granulated sample is put into a beaker, and distilled water is poured into the beaker to stir the sample mixed liquid. Then, while stirring the sample mixed liquid,
Measure the pH value of the liquid, adjust the pH of the liquid if necessary,
By continuing stirring, specific components are eluted from the sample.

In the above test, a magnetic stirrer has been conventionally used to stir the sample-mixed liquid. In addition, a propeller-type stirrer in which a stirring blade is fixed to the lower end of a rotating rod has also been used in some cases.

[0004]

However, unlike the case where liquids are mixed and stirred, or the liquid is stirred to dissolve a drug in a solvent, most of the water, such as fly ash, is water. It is difficult to uniformly stir a liquid mixed with a powdery or granular sample that does not dissolve in a solvent such as a magnetic stirrer, in which a rotor placed inside the beaker is rotated by a magnet placed outside the beaker. Therefore, there is a limit to the stirring ability, and depending on the sample, it may not be possible to perform sufficient stirring so that all of the sample floats in the liquid and is evenly dispersed near the liquid surface.

On the other hand, in the propeller type agitator, the solution is agitated by the agitating blade, so that the solvent is easily aerated by the agitation. When the solvent is aerated, absorption of carbon dioxide gas in the air into the solvent occurs, which affects the pH value of the solution, and even if the pH of the solution is adjusted, the pH value changes. In addition, the stirring blade is usually placed slightly above the inner bottom surface of the beaker.Therefore, in the case of a powdery granular sample having a large specific gravity, simply swirling it near the bottom of the beaker will spread the sample over the entire liquid. In some cases, it cannot be evenly distributed.

The present invention has been made in view of the above circumstances, and a state in which a sample mixed with a powdery or granular sample that does not dissolve in a solvent is sufficiently stirred so that the sample is evenly dispersed in the entire liquid. It is also an object of the present invention to provide a stirring device capable of suppressing the absorption of carbon dioxide gas into the solvent by reducing the degree of aeration of the solvent by stirring the liquid.

[0007]

The invention according to claim 1 is
A stirrer which stirs the liquid contained in the container in which the powdery and granular sample is mixed in a non-dissolved state was configured as follows.
That is, at the lower end of a rotating rod that is rotatably supported in a vertical position, a rod-shaped rotor is hung vertically, and the upper half of the rotor is curved so as to form a part of a cylindrical surface. Along with the formation, the lower half of the rotor is formed into a flat surface so as to form a triangular prism shape or a flat plate shape, and the rotor is placed in a container.
The stirring device was configured by inserting and arranging the lower end of the rotor so as to be close to or in contact with the inner bottom surface of the container, and connecting the upper end of the rotating rod to the rotating shaft of the motor.

According to a second aspect of the invention, in the agitating device according to the first aspect, a biasing means is interposed between the rotary rod and the rotary shaft of the motor, and the rotary rod serves as the rotary shaft of the motor. It is characterized in that they are connected so as to be urged downward.

According to a third aspect of the present invention, in the agitator according to the first or second aspect, the rotor is arranged on the axis of the rotary rod and a part of the rotor protrudes from the lower end of the rotor. A sliding contact body whose lower end surface contacts the inner bottom surface of the container is slidably attached to the rotor.

In the stirrer according to the first aspect of the invention, the rotating rod is rotated by the motor, and the rotor vertically provided at the lower end of the rotating rod is rotated. Therefore, the stirring capacity is increased by increasing the capacity of the motor. It can also be improved, and since the rotor is arranged so that its lower end is close to or abuts the inner bottom surface of the container,
It can be sufficiently stirred so that all of the sample floats in the liquid and is evenly dispersed to the vicinity of the liquid surface. Since the upper half of the rotor is formed as a curved surface so as to form a part of the cylindrical surface, the liquid surface is less likely to ruffle as compared with the case where the solution is agitated by the stirring blade. Therefore, the degree of aeration of the solvent due to the stirring of the liquid is small, and the absorption of carbon dioxide gas into the solvent is suppressed.

In the structure of the invention according to claim 2, since the rotary rod is elastically held by the rotary shaft of the motor so as to be movable in the vertical direction, the rotary rod and the rotary rod can be adjusted when adjusting the height position of the rotor. Even if the rotor hits the inner bottom surface of the container when the rotor is inserted into the container, the rotor does not damage the bottom of the container. Also,
Even when the rotor is rotated with the lower end of the rotor in contact with the inner bottom surface of the container to stir the solution, the rotor elastically contacts the inner bottom surface of the container, No excessive force is applied to the bottom of the container, and there is no concern that the bottom of the container will be damaged during stirring.

According to the third aspect of the present invention, the rotating rotor does not come into direct sliding contact with the inner bottom surface of the container, and the stationary slidable contact body comes into contact with the inner bottom surface of the container. Since the rotor rotates by sliding with respect to the sliding contact body, the degree of wear of the rotor is reduced as compared with the case where the rotor directly contacts the inner bottom surface of the container and rotates. In particular, when stirring a liquid in which a powdery sample is mixed in a solvent in a non-dissolved state in a container, the powdery sample intervenes between the rotating rotor and the inner bottom surface of the container. Although the degree of wear of the rotor increases, in the configuration of the invention according to claim 3, wear of the rotor does not occur because the granular particles do not exist between the rotating rotor and the inner bottom surface of the container. Can be minimized. Also, the bottom of the container is not damaged by the rotor.

[0013]

Preferred embodiments of the present invention will be described below with reference to the drawings.

1 to 6 show one embodiment of the present invention. FIG. 1 is a front vertical sectional view showing a stirring unit of a stirring device according to the present invention together with a container in which the stirring device is used.

The stirring unit 10 of the stirring device is constructed by vertically arranging a rod-shaped rotor 14 at the lower end of a rotary rod 12, and the lower end of the rotor 14 is close to (or in contact with) the inner bottom surface of the beaker 16. ) Is inserted into the beaker 16.
The rotor 14 is made of, for example, a fluororesin. Inside the beaker 16, in addition to the stirring unit 10, a pH electrode 18 for measuring the pH value of a solution contained in the beaker 16, for example, a liquid in which fly ash is mixed in distilled water.
Is inserted through the lid body 20 of the beaker 16, and the beaker 16 is arranged by inserting almost the entire beaker into the constant temperature layer 22. The description is omitted in this specification.

FIG. 2 is a front view showing the entire structure of the stirring device, and FIG. 3 is a partially enlarged vertical sectional view thereof. The drive unit 24 of the stirring device is a speed control motor 26.
And a gear head 28, and the drive unit 24 is
It is fixed via a spacer 36 on a mounting plate 34 fixed to a cover 32 attached to the apparatus fixing portion. The rotating shaft 30 protruding downward from the gear head 28 of the drive unit 24 is connected to the rotating rod 12 of the stirring unit 10 via the shaft connecting / rotating supporting unit 38, and the rotating rod 12 is hung in a vertical posture. It is lowered and rotatably supported.

The structure of the shaft connecting / rotating support portion 38 will be described with reference to FIG. The shaft connecting / rotating support portion 38 includes an outer cylinder member 40 fixed to the lower surface side of the mounting plate 34, a pair of upper and lower bearings 42, 42 held by the outer cylinder member 40, and a pair of bearings 42, 42. The inner cylinder member 44 rotatably supported about the vertical axis, the retaining nut 46 screwed to the upper end portion of the inner cylinder member 44, and the connecting rod member 48 inserted in the inner cylinder member 44. It consists of The upper end side of the inner cylinder member 44 is closed, and an engaging protrusion 50 is integrally formed on the upper end surface thereof. The engagement protrusion 50 of the inner cylinder member 44 and the rotary shaft 30 of the drive unit 24 are connected by the coupling 52 so that the rotary shaft 30 and the inner cylinder member 44 rotate integrally.

A bush 54 is mounted on the inner peripheral surface of the inner cylinder member 44, and a connecting rod member 48 inserted in the inner cylinder member 44 is slidably engaged in its axial direction. .
A guide groove 56 is formed on the inner cylinder member 44 so as to penetrate from the outer peripheral surface to the inner peripheral surface along the axial direction. Then, the screw shaft portion of the locking screw 58 is arranged so that the head portion is arranged in the guide groove 56 of the inner tubular member 44 and the connecting rod member 4 is formed.
8 and is screwed into the guide groove 56 along the longitudinal direction (axial direction of the inner cylinder member 44) of the guide groove 56.
The vertical direction of the connecting rod member 48 is allowed within the range in which the head of the locking rod moves, and the head of the locking screw 58 comes into contact with and engages with the inner side surface of the guide groove 56, so that the inner cylinder Rotation of the connecting rod member 48 with respect to the member 44 is prevented, and the inner cylindrical member 44 and the connecting rod member 48 rotate together. Further, the head portion of the locking screw 58 abuts and engages with the lower end surface of the guide groove 56, so that the connecting rod member 48 does not fall downward from the inner cylindrical member 44. Further, a concave portion 60 is formed in the axial direction of the upper end surface of the connecting rod member 48, and the lower end side is inserted into the concave portion so that the upper end abuts on the inner upper end surface of the inner cylindrical member 44. A spring 62 is provided. Since the compression coil spring 62 is thus interposed between the inner cylinder member 44 and the connecting rod member 48,
The connecting rod member 48 is always urged downward with respect to the inner cylinder member 44. Therefore, as will be described later, even if the rotor 14 at the lower end of the rotary rod 12 of the stirring unit 10 integrally fixed to the connecting rod member 48 abuts on the inner bottom surface of the beaker 16, the impact is softened. Will be done.

A bulging portion 64 is integrally formed on the lower end side of the connecting rod member 48, and a portion below the bulging portion 64 is a thin cylindrical portion 66. A male screw is threaded on the outer peripheral surface of the tubular portion 66. Also, the tubular portion 6
At the lower end portion of 6, a plurality of split grooves 6 along the axial direction are provided.
8 is formed, and the outer peripheral surface of the lower end portion of the tubular portion 66 is formed into a tapered surface. Then, the upper end portion of the rotating rod 12 of the stirring portion 10 is fitted into the inside of the tubular portion 66, and the tightening nut 70 that is screwed into the male screw of the tubular portion 66 is tightened, whereby the lower end portion of the connecting rod member 48. The upper end portion of the rotating rod 12 is fixed to the connecting rod member 48 and the rotating rod 12 rotate integrally and move integrally in the vertical direction.

Next, as shown in a partial perspective view in FIG. 4, a partial front longitudinal sectional view in FIG. 5, and a partial side view in FIG. 6, respectively, a rotor 14 is attached to the lower end of the rotary rod 12 of the stirring section 10. Is screwed on. As shown in FIG. 6, the rotor 14 has a curved surface such that an upper half portion thereof forms a part of a cylindrical surface, and a lower half portion thereof is flat and has a triangular prism shape. On the lower end side of the central portion of the rotor 14, a sliding contact body 72 is attached at a position on the axis of the rotating rod 12, and the sliding contact body 72 is attached.
Is formed of a small disc portion 74 protruding from the lower end of the rotor 14 and a shaft portion 76 slidably engaged with an engagement hole 78 formed in the central portion of the rotor 14. Since the sliding contact body 72 is slidably attached to the rotor 14, the rotating rotor 14 does not directly contact the inner bottom surface of the beaker 16 but the inner bottom surface of the beaker 16. Since the slidable contact body 72 in a stationary state comes into contact with, the bottom of the beaker 16 is prevented from being damaged by the rotor 14.

In the stirrer having the above-described structure, when the speed control motor 26 of the drive unit 24 is driven, the rotational driving force is transmitted from the rotary shaft 30 to the inner cylinder member 44 via the gear head 28 and integrated with the inner cylinder member 44. The connecting rod member 48 and the rotary rod 12 rotate. And beaker 16
The fly ash mixed liquid is agitated by rotating the rotor 14 at the lower end of the rotary rod 12 in the liquid contained in, for example, the fly ash mixed in distilled water. At this time, rotor 1
Since No. 4 is arranged near the bottom of the liquid so that the lower end thereof is close to or in contact with the inner bottom surface of the beaker 16, all of the fly ash floats in the liquid and is evenly dispersed to near the liquid surface. It is agitated sufficiently to reach the state. In addition, since the upper half of the rotor 14 is formed as a curved surface so as to form a part of the cylindrical surface, the liquid surface is less likely to ruffle as compared with the case where the solution is stirred by the stirring blade. Therefore, the degree of aeration of the solvent by stirring the liquid is reduced,
Absorption of carbon dioxide into distilled water is suppressed.

The shape of the rotor is not limited to that shown in FIG. 6. For example, as in the rotor 80 shown in the side view of FIG. The lower half part may be formed in a flat plate shape.

[0023]

EFFECTS OF THE INVENTION By using the stirrer according to the first aspect of the present invention, the liquid in which the powdery or granular sample that does not dissolve in the solvent is mixed is sufficiently agitated, and the sample is dispersed evenly throughout the liquid. In addition, the degree of aeration of the solvent due to stirring of the liquid is reduced, the absorption of carbon dioxide gas into the solvent is suppressed, and the influence of the absorption of carbon dioxide gas into the solvent on the pH value of the solution is eliminated. Therefore, it is possible to improve the reliability of the test data in the availability test or the like for measuring the elution amount of the specific component from the solid sample.

According to the configuration of the invention of claim 2, it is possible to prevent the bottom of the beaker from being damaged by the rotor.

According to the structure of the third aspect of the present invention, the wear of the rotor can be minimized, and the bottom of the container can be prevented from being damaged by the rotating rotor.

[Brief description of drawings]

FIG. 1 is a front vertical sectional view showing an embodiment of the present invention and showing a stirring section of a stirring device together with a container in which the stirring device is used.

FIG. 2 is a front view showing the overall configuration of the stirring device shown in FIG.

FIG. 3 is a partially enlarged vertical sectional view of the stirring device shown in FIG.

FIG. 4 is a partial perspective view showing a stirring unit of the stirring device shown in FIGS. 1 to 3.

5 is a partial front vertical cross-sectional view of the stirring section shown in FIG.

6 is a partial side view of the stirring unit shown in FIG.

7 is a partial side view showing a stirring unit provided with a rotor having a different shape from the rotor shown in FIGS. 4 to 6. FIG.

[Explanation of symbols]

 10 Stirring Unit of Stirring Device 12 Rotating Rod 14, 80 Rotor 16 Beaker 24 Driving Unit of Stirring Device 26 Speed Control Motor 30 Rotating Shaft 38 Shaft Connecting / Rotating Supporting Unit 40 Outer Cylinder Member 42 Bearing 44 Inner Cylinder Member 48 Connecting Rod Member 52 Coupling 56 Guide groove 58 Locking screw 62 Compression coil spring 66 Cylindrical portion 70 Tightening nut 72 Sliding contact body

Claims (3)

[Claims] 1. A stirrer for stirring a liquid containing a powdery and granular sample mixed in a solvent in a non-dissolved state in a container, wherein a lower end of a rotating rod rotatably supported in a vertical posture. ,
An entire rotor is rod-shaped, the upper half of which is formed as a curved surface so that it forms a part of a cylindrical surface, and the lower half of which is formed as a flat surface so as to form a triangular prism or a flat plate. A child is inserted into the container so that the lower end of the rotor is close to or in contact with the inner bottom surface of the container, and the upper end of the rotating rod is connected to the rotation shaft of the motor. A stirrer for the mixed liquid containing powdery and granular samples. 2. The urging means is interposed between the rotating rod and the rotating shaft of the motor, and the rotating rod is connected so as to be urged downward with respect to the rotating shaft of the motor. Stirrer for liquid containing powdery and granular samples. 3. A slidable contact body, which is arranged on the axis of the rotary rod and has a part projecting from the lower end of the rotor and whose lower end surface contacts the inner bottom surface of the container, is slidable with respect to the rotor. 3. The stirring device for a liquid containing a granular sample according to claim 1 or 2, which is attached to.