SU898296A1 - Device for investigation of substance solidification peocess - Google Patents

Description

(54) DEVICE FOR INVESTIGATING THE PROCESS OF CIVING MATTERS

The invention relates to devices based on dynamic methods for measuring the physicomechanical characteristics of vegetation and can be used in chemical, aeronautical, radio engineering and other industries for studying the structural features of media in the course of their curing.

A device for curing a curing process is known. The test substance is applied to an elastic cantilever, a fixed substrate, which is subjected to a forced deformation when the generator is operated in the form of an electric motor with an adjustable number of revolutions. Measuring the gap of the plate from the exciting voltage and the amplitude of its displacement, all the characteristics of the medium under study are calculated in the process of its structuring 1,

The drawback of the device is a large error. The determination of a6i is the absolute value of the physicomechanical characteristics associated with the uncertainty of the shape of the sample under study ..

The closest in essence to the proposed invention is a device for studying the process of curing substances (polymers), containing an elastic sensitive element fixed at one end in a fixed clamp, an inertial element with a movable clamp in which the second end is fixed

10 elastic element stimulating and recording converters, information processing unit. The study of the curing process of polymers is carried out as follows. Elastic

15 sensitive element made of a bundle of quartz, carbon or slag high modulus fibers is impregnated with the test substance, which is a 20% solution

20 of the polymer in the solvent and, as the solvent dries, the logarithmic decrement and oscillation period, the combined oscillatory system are measured, calculating the physicomechanical characteristics (dynamic modulus, loss modulus, etc.) of the test medium 12 based on the experimental results.

The disadvantage of known devices

30 is a large error in the determination of physicomechanical characteristics, and in most cases it is completely impossible to obtain their absolute values, which is due to the uncertainty of the shape and size of the sample under study. In addition, the required long-term sample preparation makes the device of low express and inconvenient to operate.

The purpose of the invention is to improve the accuracy, speed of measurement and ease of use.

The goal is achieved by the fact that the proposed device for the study of the curing process of substances containing an elastic sensing element fixed at one end in a fixed clamp, an inertial element with a movable clamp in which the second end of the elastic sensing element is fixed, exciting and recording converters and an information processing unit, wherein the sensing element is made in the form of two detachable plates with protrusions forming a rectangular internal volume, filled with substance under investigation.

FIG. 1 shows the construction of the measurement transducer; in fig. 2 and 3 - one and second split plates of the sensitive element, respectively; “And FIG. 4 - the proposed sensitive element in the collection; on league. 5 and b are other possible embodiments of the sensitive element showing the optimality of the proposed design (Fig. 4).

The measuring transducer contains an elastic sensing element 1 (Fig. 1), one end fixed in a fixed clamp 2, an inertial element 3 with a movable clamp 4 in which the second end of the elastic sensing element 1 is fixed, the excitation transducers including Katum 5 and attached in diametrically opposite the positive points of the inertial element 3, the cores 6, the recording converters comprising the light source 7, the photodetector B, and the optical shutter 9 attached to the inertial element 3. The elastic sensing element 1 and the inertial element 3 form an oscillating system that performs torsional oscillations. The damping of another kind of oscillation is carried out using a sliding bearing formed by the needle 10 in the center of the inertial element 3 and the cylindrical sleeve 11. The temperature is maintained and maintained by the thermal chamber T The oscillation parameters are measured using the information processing unit 12, where the signal c) of the receiver 8 arrives.

The sensing element 1 consists of two plates assembled by overlap (Fig. 4), each of which is a two-step rectangular parallelepiped and consists of steps 13 and 14 (Figs. 2 and 3). The study of the curing process is carried out as follows. The overlapping sensitive element i is collected and the test medium is placed in volume 15 between parallel planes of elastic elements 14. Surpluses are removed mechanically using any scraper. Depending on the initial state of the medium (high viscosity), the volume can be filled before the plates are assembled. The sensor element filled with the medium is placed at one end into the stationary 2, and the other into the movable 4 terminals of the measuring transducer. The oscillatory system containing elastic sensitive 1 and inertial 3 elements with the help of excitatory transducers (Katuyki 5, cores 6) applies a torque, after removing which the system makes free oscillations, to deform the medium under study in a volume 15 between parallel planes of elastic elements 14. At the output of the photodetector 8, exponentially decaying electrical oscillations are generated, whose parameters (logarithmic decrement and period) are measured using information processing unit 12.

The calculation of the physicomechanical characteristics (dynamic modulus, loss modulus, tangent of the angle of mechanical loss, etc.) is made according to the classical formulas for inverse memory. The physicomechanical characteristics are calculated in this case with a sufficiently high accuracy, since the shape of the sample is determined by the geometric dimensions of the cavity, which is formed by parallel planes of elastic elements and edges of the second stage of a two-step parallelepiped.

Due to the fact that the sensitive element is collapsible and it takes a short time to fill it with the medium, the device has high express speed and is convenient to use, since the sensitive element is used repeatedly and does not require special metering devices to fill it. The proposed sensing element, being detachable, has a high quality factor, which is achieved by small and permanent losses during repeated clamping in the movable and stationary clamps.

Volume 15 for filling with the test medium can be obtained not only with the help of two two-stage parallelepipeds (Fig. 4), but also.

for example, by attaching the plate 16 to a three-step parallelepiped 17 (FIG. 5) or by means of two three-step parallelepipeds 18, 19 (FIG. 6). The height of the steps 13 placed in the clamps is chosen from the condition of providing a good surface voltage of the liquid sample in the gap between parallel planes, i.e., a reliable holding of the medium in the cavity 15. Practically, for example, for water this height is chosen within 0.4 - 0.5 mm for media with higher viscosity, respectively, of large values, not more than 2.5-3 mm. The deformation of the medium in the specified cavity is equivalent to the deformation in the narrow gap of the viscometer, which significantly increases the sensitivity. °

The application of the proposed sensing element distinguishes this device from the known one, since it allows determining the absolute values of the physicomechanical characteristics of the medium during its curing with sufficiently high accuracy and rapidity. In addition, the convenience of operation is greatly improved, since the sensitive element is technologically advanced and allows its repeated use.

Invention Formula

A device for examining the process of curing substances, comprising an elastic sensing element fixed at one end in a fixed clamp, an inertial element with a movable clamp in which the second end of the elastic sensing element is fixed, the excitation and recording transducers and

0 an information processing unit, characterized in that, in order to improve the accuracy, expressness of measurements and ease of operation, the sensitive element is made in

Figure 5 shows two detachable plates with protrusions forming between the plates a rectangular internal volume filled with the substance under study.

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Sources of information taken into account in the examination

1. Author's certificate of the USSR 307317, cl. G 01 N 11/16, 1971.

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2. Malkin A.Ya., Askadsky A., A.

and Kovriga V.V. Methods for measuring the mechanical properties of polymers. M., Himi, 1979, p. 185-188 (prototype).

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Claims (1)

Claim A device for studying the curing process of substances, containing an elastic sensitive element fixed at one end in a fixed clamp, an inertial element with a movable clamp, in which the second end of the elastic sensitive element is fixed, exciting and recording transducers, and an information processing unit, πηη e with the fact that, in order to improve accuracy, express measurements and ease of operation, the sensitive element is made in the form of two detachable plates with protrusions forming between the layer we rectangular internal volume filled with the test substance.