RU1805320C - Device for determining rigidity of textile materials - Google Patents

Abstract

The invention relates to technical measurements, in particular to devices and methods for testing textile materials. The invention is a device for determining the stiffness of textile materials, can improve measurement accuracy and simplify the design of the device. This is achieved by the fact that the unit for recording the forces acting on the test sample, including the measuring transducer and its fastening system, is made in the form of a fixedly mounted inductor in the hole. The glass tube is tightly installed, the inner diameter of which exceeds the core diameter by no more than 1.0-1.5 mm, the core being a permanent magnet mounted on the end of an L-shaped copper wire, the other end of which is rigidly connected to the movable part of the fastener assembly. 1 ill. ate

Description

The invention relates to methods and devices for testing textile materials.

The purpose of the invention is to improve measurement accuracy and simplify the design.

The drawing shows a device for determining the stiffness of textile materials.

The device consists of a fastener assembly consisting of an upper fixed vise 1 and a lower movable vise 2, between which the test sample 3 is attached; from a loading unit, which is a removable load - a constant current electromagnet 4 located under a movable vice; from the registration unit of the forces acting on the sample, including a copper L-shaped wire 5, one end rigidly connected with a movable vice 2, on

at the other end, a permanent magnet carrier, which acts as a core placed in a fixedly mounted inductor 7, in the opening of which a glass tube 8 is tightly mounted; and from a recording unit including a current amplifier 9. a current limit selector 10 and an oscilloscope 11.

The device operates as follows.

A test sample of material 3 is secured between the upper vise 1 and the lower 2.

After being connected to the network through contact K, the electromagnetic load 4 is pressed against the vise 2. The test sample 3 is loaded until the required pre-tension is obtained, for example, equal to 00

o ate o

to the base at the time of the filament.

When the elastic system of the sample is balanced, the permanent magnet 6 located inside the inductor 7 becomes stationary.

Then, by switching the toggle switch to contact K2, the record of the oscilloscope 11 is turned on and at the same time, the load - the electromagnet 4, which falls,

A short-term load is imparted to the sample, causing vertical reciprocating vibrational motions, which are transmitted to the permanent magnet core 6 through a copper L-shaped wire 5. The core moves along the glass sleeve 8 located in the hole of the inductor 7, creating an electric current. the magnitude of which varies with the amplitude of the oscillation of the permanent magnet 6, which is caused by the vibrations of the test sample 3.

The electrical signal then passes through a current amplifier 9 and a current limit selector 10 to the oscilloscope 11, where the damped oscillations of the test sample are graphically recorded.

Then, on the basis of the obtained graphical record of the damped free vibrations of the test sample, the stiffness coefficient is calculated by which the stiffness of the test material is judged.

The control system, including the nodes of loading, recording of efforts and recording, is a closed electric circuit connected to the power source 12 through the contacts Kch and "2.

When the Ki switch is turned on by the toggle switch, a load electromagnet is connected to the circuit, and by switching the toggle switch to contact K2, i.e. When the oscilloscope recording unit is turned on, the electromagnet is switched off from the electric circuit. The presence of a copper L-shaped wire, as well as the presence of a tightly mounted glass tube in the hole of the inductor, makes the error in measuring the elasticity of the registration system itself extremely small. In addition, the implementation of the inner diameter of the glass tube with an excess of 1.0-1.5 mm in diameter of the core provides the maximum signal and reduces to zero the influence-resistance of the air inside the coil and the friction resistance against the inner surface of the inductor when the core moves - by measurement error.

This increases the measurement accuracy on this device by 2.5-3.0 times in comparison with the prototype and reduces the measurement error to 2-3%, against 5-7% on the prototype. The proposed design of the device does not require special installation in the initial position during repeated testing, in

Claims (1)

Unlike the prototype, which provides greater ease of use. SUMMARY OF THE INVENTION An apparatus for determining the stiffness of textile materials, comprising an assembly fastening the test sample, including a fixed and movable vice, a loading system consisting of cargo electromagnets connected to a moving vice, an vibration recording unit, consisting of an electric oscillation amplifier, an electric vibration limit selector, an oscilloscope, an oscillation transducer and a current source connected to the loads-electromagnets and the oscilloscope, characterized in that, in order to simplify the design of the device and improve the accuracy of the tests, the oscillation transducer in made in the form of an inductor with a core in the form of a permanent magnet connected by a L-shaped copper wire with a movable vice, and a glass tube is installed in the inner hole of the inductor without gap, the inner diameter of which is 1.0-1.5 mm larger than the diameter of the core.