SU1300291A1 - Device for measuring high reversible deformations of polymeric fibres and films - Google Patents

Abstract

The invention relates to a measurement technique, to means of testing polymer fibers and films, which have the property of changing their geometrical dimensions under the influence of an acidic or alkaline medium. The aim of the invention is to expand the range of forces applied to the sample and to increase the accuracy by stabilizing the applied force, regardless of the deformation of the investigated No. Slab (L p 00 o SG

Description

sample. When the sample 2 is extended, the rotor of the synchro sensor 7 is rotated by an angle proportional to the deformation of the sample. After the sample elongation is completed, chamber 1 is filled with acid and the change in size of sample 2 is fixed by the device 13. Use

one

The invention relates to a measuring technique, to means of testing polymer fibers and films, by the property of changing its geometrical dimensions under the influence of acids or an alkaline medium, and allows determining the deformation of the samples for a given force applied to it.

The aim of the invention is to expand the range of forces applied to the sample and to increase accuracy by stabilizing the applied force, regardless of the strain of the sample under investigation.

The drawing shows a schematic diagram of the device.

The device contains a thermostated chamber 1 filled with an acid or alkaline solution and designed to place sample 2 in it, a fixed stand 3 placed inside chamber 1, with the free end of which one end of sample 2 is connected, flexible pull 4, one horse of which is connected to the sample 2, and the second end is fixed on the pulley 5, the shaft 6, on which the pulley 5 is fixed, the selsyn sensor 7, the stator of which is fixed on the frame 8, and the rotor is connected to the shaft 6, the generator 9, the stator of which is connected to the shaft 6, the engine 10 whose stator is fixed stationary on the frame 8, and its rotor is connected to the rotor of the generator 9, selsyn receiver 11, the windings of which are connected to the windings of the selsyn sensor 7 according to a transformer circuit, phase detector 12, the first input of which is connected to the winding of the power supply of the selsyn sensor 7, the second input - with the power supply winding of the selsyn-receiver 11, automatic self-recording compensation device 51, the device 13, whose input of the soy device of the loading device in the form of coaxially mounted direct current motor 10 and generator 9 allows to smoothly change the load, The applied force does not depend on the deformation of the sample. 2. 1 Il.

five

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dinene with the output of the phase-sensitive detector 12, and the rotor of its executive motor is connected to the rotor of the selsyn-receiver 11, resistors 14, loads of the generator 9, current indicator 15 connected in series to the output of the generator 9, engine power supply unit 16, capacity 17 for acid and capacity 18 for alkali, pipelines 19 and 20, connecting vessels 17 and 18 with chamber 1 through a shut-off valve, and switch 21 for switching on the load of the generator 9. The device operates as follows.

Sample 2 is fixed between the pillar 3 and the grip 4 and placed in the chamber 1, with this rotor of the selsyn-sensor 7 is in the zero position and, accordingly, the output of the automatic self-recording compensating device 13 is also the zero position, the required speed is set to the Engine 10 and the switch 21 is connected re-

generator 14 is 9.

The reactive moment of the stator of the generator 9 through the shaft 6, the pulley 5 and the flexible rod 4 is applied to the sample 2. After this, the chamber 1 is filled with an alkaline medium at a given temperature. Sample 2 swells and elongates under the action of force, which causes the rotor of the selsyn sensor 7 to rotate by an angle proportional to the deformation of the fiber or film sample under study. After the sample has been extended, which corresponds to a straight line at the output of the automatic self-recording compensating device 13, the alkaline solution is removed from chamber 1 and filled with acid from tank 17. The sample under the action of acid settles and changes its

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the deformation is fixed by the device 13. Then the cycles are repeated.

Using the proposed design of a loading device in the form of an engine generator allows a sample to be applied with a load from 1 to 40 g, which can be altered during the experiment, the amount of applied force does not depend on the deformation of the sample, which will improve the accuracy of strain measurement in a wide range of applications to sample effort.

Claims (1)

Invention Formula A device for measuring high reversible deformations of polymer fibers and films for a given load force in an acidic or alkaline liquid medium, containing a thermostatically controlled working chamber filled with a liquid medium with a given acidity index, designed to hold the test fiber or film in it, the measuring unit containing automatic self-recording compensating device, selsyn sensor and connected to it by the transformer circuit sel4. Editor K. Voloshchuk Order 1UO / 39 Compiled by V. Zaikin Tehred N.Glushchenko Proofreader S. Cherni Circulation 678 Subscription VNIPPI State Committee of the USSR on inventions and postcards 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 A syn receiver, the output of which is connected via a phase-sensitive detector to the input of an automatic recording compensation instrument, the rotor of the executive motor of which is rigidly connected to the rotor of the selsyn-receiver, and I have The fixed grip and movable grip with flexible pull, characterized in that, in order to expand the range of applied forces and improve accuracy by stabilizing the load, the loading unit is designed as a coaxially mounted DC motor, the stator of which is fixed, generator, load resistors generator and load current indicator of the generator, the rotor of which is rigidly connected to the rotor of the engine, the generator stator is rigidly connected to the rosin of the selsyn-sensor, the stator of which is fixedly fixed, and the generator output is connected to series-connected load resistors and a generator load current indicator, and the device is equipped with a pulley connected to a flexible rod and mounted on the shaft of the selsyn-sensor.