JPH0138519Y2 - - Google Patents

Description

[Detailed description of the invention] The invention relates to a viscoelasticity measuring device,
Its purpose is to accurately measure the viscoelasticity of liquids with low viscosity.

The principles of conventional liquid viscoelasticity measuring devices are explained in the first, second, and
This will be explained with reference to FIG. In FIG. 1, the sample container 1 is rotated in a certain direction, vibrated, or moved by superimposing rotation and vibration. This motion is transmitted to the inner cylinder 5 via the sample 8 and rotates the inner cylinder 5. The angle of rotation is detected by a position sensor 3 that is equivalent to a photodiode that receives the reflected light from the mirror 2, and the converted electric signal is sent between the magnets 6 and sent to the coil 4 fixed to the inner cylinder 5. Feedback in the direction of canceling the rotation of. The viscoelasticity of the sample is measured from the coil current value (proportional to the rotational force) at that time. FIG. 2 shows a state in which the inner tube 5 and the sample 8 are contained in the sample container 1 of FIG.

However, in such a conventional viscoelasticity measuring device, when the sample is small, the contact area with the sample is small, and the rotational force applied to the inner cylinder of the sample is small. Particularly in cases where a film is formed on the sample surface, there is a drawback that the measurement error increases because the influence of the film on the rotational force cannot be ignored. Conventionally, in the laboratory, in order to reduce such errors, a method was used in which a fixed ring 7 was installed as shown in Figure 3 to block the rotational force due to the liquid surface film of the sample 8. The addition of the fixed ring 7 to block the influence of the above complicates the manufacturing of the measuring device and the setting during measurement, and it is also troublesome to always put the same sample into the sample container 1. Furthermore, since the conventional cylinder 5 uses a solid rod as shown in FIGS. 1, 2, and 3, it also has the disadvantage of having a low natural frequency and a narrow measurable frequency range.

The disadvantage of such conventional measuring devices is that according to the present invention, a sample has a hollow suspended cylinder with a degassing hole, a convex portion extending from the center of the bottom surface to the cylinder, and an annular wall portion surrounding this convex portion. a container;
This is improved by a double cylindrical liquid material viscoelasticity measuring device in which notches are provided around the top of the convex portion and on the inner surface of the top of the annular wall portion.

The present invention will be explained in detail with reference to FIGS.
A hollow suspended cylinder 10 with a deaeration hole 9 is shown in FIG.
Compared to the conventional inner cylinder 5, the hollow cylindrical shape reduces the weight, which increases the natural frequency and has the advantage of expanding the measurable vibration range.Furthermore, since it comes into contact with the sample inside and outside the cylinder, The contact area increases and sensitivity improves. In order to further reduce the influence of the liquid surface, the sample container 11 has a convex portion 12 extending from the center of the bottom surface to the hollow suspended cylinder 10 and an annular wall portion 14 surrounding this convex portion. Notches 13 are provided around the top of the extending convex portion 12 and on the inner surface of the top of the annular wall portion 14 surrounding the convex portion. As a result, the mouth of the sample container expands, and as shown in FIG. 3, the influence of film formation on the liquid surface can be reduced without adding the fixed cylinder 7. It is advantageous to provide an overflow hole 15 in the upper part of the sample container 11 in order to automatically set a constant sample at all times. This makes it possible to easily set a fixed sample and improve measurement efficiency.

[Brief explanation of the drawing]

Figure 1 is a diagram explaining the principle of a conventional viscoelasticity measurement device.
FIG. 2 is a sectional view for explaining the state in which a sample is contained in a sample container, FIG. 3 is a similar sectional view with a fixed cylinder added, and FIG. 4 is a sectional view of an embodiment of the present invention. In the figure, 9: deaeration hole, 10: hollow suspended cylinder, 1
1: sample container, 12: convex portion, 14: annular wall portion, 13: notch portion.

Claims (1)

[Scope of utility model registration request] a sample container having a hollow suspended cylinder having a degassing hole, a convex portion extending from the center of the bottom surface into the cylinder, and an annular wall portion surrounding the convex portion; A double cylindrical liquid substance viscoelasticity measuring device characterized in that a notch is provided in the top inner surface of the annular wall portion.