JPH048740B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vibrating movable part of an apparatus for measuring the apparent viscosity of liquids, gases, etc.

(Prior Art) As previously disclosed in Japanese Patent Application Laid-Open No. 59-107236, the present applicant attached sensitive members to both legs of a vibrating body that was driven to vibrate at a resonance frequency in the air.
A sensitive member that vibrates in opposite phase is inserted into a viscous body with a known viscosity, and a relationship in which the change in response amplitude value is linear exponentially due to the viscosity difference is determined in advance, and this relationship is used to We developed a method to determine the viscosity of a sample whose viscosity is unknown from the measured amplitude value.

(Problems to be Solved by the Invention) In the above-mentioned prior art, as shown in FIG. As a result, a deviation occurs in the excitation direction, producing a Y component as shown in Figure 4, which causes a vertical reaction y to the pointing member.
Therefore, as shown in FIG. 5B, the amplitude X ₂ becomes small, and a constant amplitude value cannot be obtained due to the difference in the support state. Therefore, when the amplitude value changes, there is a problem that the inverse phase relationship between the viscous resistance of the sample and the amplitude value no longer holds, making viscosity measurement impossible.

(Technical means for solving the problem) The present invention has been made by focusing on the above-mentioned problem, and involves inserting a sensitive plate attached to the tips of a pair of leaf springs into a measurement sample, and using an electromagnetic vibration source to generate a signal with an opposite phase. In a viscosity measuring device configured to measure the viscosity of a sample to be measured based on the response amplitude of a detection part while vibrating oppositely to each other, a recess is formed inwardly between a pair of leaf springs to fix a magnet part; It is characterized in that the center of gravity of the vibrating movable part is located on the central axis of the leaf spring.

(Example) Hereinafter, a detailed explanation will be given based on an example. 1 in FIG. 1 is an upper box fixed to a support rod 2, and both mounting surfaces of a support member 3 made of a hard material that does not cause corrosion and fixed to the lower surface of the upper box 1 are smooth surfaces 3a. The upper parts of a pair of leaf springs 4 are fixed with high-tensile bolts 5, and a disk-shaped sensitive plate 6 is attached to the tip.
The upper part of the aluminum support plate 7 is fixed to the leaf spring 4. A recess 7a is formed inside the middle of the support plate 7 to fix the magnet part 8, a coil part 9 is fixed to both sides of the tip of the support member 3, and the magnet part 8 is fitted into the coil part 9 to form an electromagnetic vibration source. are doing. As shown in FIG. 3, the center of gravity G of the vibrating movable portion of the leaf spring 4 below the point P which comes into contact with the lower surface of the support member 3 is located on the central axis A--A of the leaf spring 4. Reference numeral 10 in FIG. 1 is a sample container, which, as shown in FIG. 2, consists of an inner container 11 made of glass and an outer container 12 made of stainless steel. The upper container lid 1 is removably attached to the tip of the support member 3 with an attachment member 13.
4 with a clamp 15. Outer container 12
A window 12a is formed in which the inside can be seen through. The gap through which the sensitive plate 6 of the container top lid 14 passes is made small to reduce the transfer of heat from the sample to the outside air. Reference numeral 16 in FIG. 1 denotes a temperature sensor using a platinum resistance temperature sensor, which is inserted into the center hole 3b of the support member 3 and fixed with a mounting bolt 17. The temperature of the sample is directly detected. A displacement sensor 18 is fixed to the support member 3 and is designed to detect the amount of relative displacement of the vibrating leaf spring 4 and send a signal to the preamplifier in the upper box 1. 21 is a viscosity display section, 20 is a sample temperature display section, and each code is 2.
2 and 23 to the upper box 1. 24 is the main switch, 25 and 26 are operation buttons, and 27 is a range switch button.
The viscosity measurement range of 100,000 MPa/s is set in 5 levels, which are selected according to the viscosity of the measurement sample. 29
28 is a viscosity display window, and 28 is a temperature display window. In addition,
The temperature and viscosity display sections can also be housed in one box.

Next, the effect will be explained. Magnet part 8,
An electromagnetic vibration source consisting of a coil section 9 causes the pair of leaf springs 4 to vibrate in opposite phases. The leaf spring 4 vibrates about a point P, which is in contact with the lower surface of the support member 3, as a fulcrum.
At this time, the center of gravity G of the vibrating movable part below point P is plate spring 4
Since it coincides with the central axis A-A of the vibration direction, no Y component perpendicular to the vibration direction is generated, and the X components also cancel each other out, so that no reaction occurs on the support member 3. The amplitude value attenuated by the sensitive plate 6 due to the viscosity difference of the measurement sample is detected by the displacement sensor 18, converted to absolute viscosity by the arithmetic circuit, and digitally displayed on the viscosity display window 29. On the other hand, the sample in the middle part of the pair of sensitive plates 6 hardly moves, and the temperature sensor 1 inserted in that part
6 accurately detects the sample temperature in the inner container 11, and the detected sample temperature is digitally displayed on the temperature display window 28.

FIG. 6 shows the results of continuous measurement of viscosity and temperature. Three types of standard solutions for viscometer calibration were used as samples, and A shows the measurement results for JS200, B for JS100, and C for JS50. For measurements, the sample was preheated to approximately 60°C in a constant temperature water bath, and then the temperature and viscosity were continuously measured while allowing it to cool naturally. As a result,
It can be seen that the viscosity of all three types of samples increases as the temperature decreases. In this way, the present viscometer can continuously measure viscosity as a function of temperature.

(Effects) The present invention inserts a sensitive plate attached to the tips of a pair of leaf springs into a sample to be measured, and while causing them to vibrate in opposite phases with an electromagnetic vibration source, the viscosity of the sample to be measured is determined based on the response amplitude of the detection section. In the viscosity measuring device configured to measure the viscosity, a recess is formed inwardly between a pair of leaf springs to fix the magnet part, and the center of gravity of the vibrating movable part is positioned on the central axis of the leaf spring. Therefore, no vertical reaction occurs on the plate spring support member of the vibrating movable part, and therefore, the required amplitude X ₁ is obtained as shown in Figure 5A, and there is an inverse correlation between the viscous resistance of the sample and the amplitude value. This relationship always holds true, allowing accurate viscosity measurements. 7-1, 7-2, 7-3 in Figure 7,
When the actual viscosity and measured viscosity are compared for each measurement range as shown in 7-4 and 7-5, each measurement range has the characteristic that the measured viscosity is accurate within 1% of the actual viscosity.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view of an embodiment of the present invention, Fig. 2 is an exploded front view of the sample container section of Fig. 1, Fig. 3 is a front view of the vibrating movable part of Fig. 1, and Fig. 4 is a front view of the vibrating movable part of Fig. 1. Fig. 3 is an explanatory diagram of the operation, Fig. 5 is a comparison diagram of response amplitude values between the present invention and a conventional device, Fig. 6 is a comparison diagram of sample temperature and measured viscosity of the present invention, and Fig. 7 is a comparison diagram of the sample temperature and measured viscosity of the present invention. It is a comparison diagram of actual viscosity and measured viscosity for each measurement range. 1... Upper box, 3... Support member, 4...
Leaf spring, 6... Sensitive plate, 7... Support plate, 8... Magnet part, 9... Coil part, G... Center of gravity of moving movable part, A-A... Leaf spring center axis.

Claims (1)

[Claims] 1. A sensitive plate attached to the tips of a pair of leaf springs was inserted into the sample to be measured, and the viscosity of the sample was measured based on the response amplitude of the detection section while causing opposing vibrations in opposite phases using an electromagnetic vibration source. In the viscosity measuring device, a recess is formed in the middle of a pair of leaf springs to fix the magnet part, and the center of gravity of the vibrating movable part is positioned on the central axis of the leaf spring. movable part.