RU35896U1 - STAND FOR TESTING SEAMS AND MATERIALS - Google Patents

Description

STAND FOR TESTING SEAMS AND MATERIALS

The useful model relates to materials science in the clothing industry, in particular, to devices for testing thread, glue and other types of compounds in sewing products, as well as materials whose quality indicators determine the durability and endurance of compounds and material.

A known method of testing thread seams for strength and stability, the device for the implementation of which 1, contains a rubber membrane, a sample with a seam, a clamping ring, a base and a channel for connecting a manometer and compressed air supply, an air distributor to provide a pulsating voltage of the sample and a meter for determining cyclic deflection of the sample. The strength of the filament joints in pressure units of the loading agent is determined by forcing the sample, then the same sample is subjected to cyclic membrane fatigue and the values of cyclic deflections are compared.

The disadvantage of this device is the impossibility of creating using it test conditions close to real, that is, in reality, more complex forces act on the connection in the products, both in magnitude and in character, in some cases they are the result of the addition of constantly acting and variable forces. For example, in a garment such as a backpack, a constant force, depending on the weight of the backpack, and a variable force, depending on walking, terrain, speed, etc., act on the straps of the backpack when walking. In addition, the stretching of the seam in the device occurs unevenly in length, forces with a different value act on each section of the seam. The maximum value of the force will be in the middle of the seam in the center of the rubber membrane. In addition, the device allows testing of only ANIMAL seams, and studies with yuteevye, welded

compounds, as well as with a variety of materials is impossible.

Closest to the proposed stand, taken as a prototype, is a device for studying the deformation properties of flat fibers containing materials 2, which contains a loading spindle, a mechanism for raising and lowering the loading spindle, a two-arm lever, swing, pivot on the axis of the selsyn sensor, rod, articulated connected to a two-arm lever. The loading spindle is equipped with a thin-walled ring with strain gauge resistance sensors, allowing them to measure the total stress and its relaxation that occurs during various cycles of deformation of the material, and crosswise arranged movable clamps holding the sample in a plane perpendicular to the action of the loading spindle, which have strain gauge resistance sensors that allow register stresses arising in mutually perpendicular directions during sample deformation.

The disadvantage of this device is the impossibility of creating test conditions close to real, that is, in reality more complex forces act on the connection in the products, both in magnitude and character, in some cases they are the result of the addition of constantly acting and variable forces. In addition, deformation of the sample occurs only at four points in mutually perpendicular directions. According to the test, it is impossible to judge the complete deformation of the material sample, since in other directions the deformation of the material is not taken into account. In addition, the device only tests materials under biaxial tension, and testing thread, glue, and welded joints is impossible.

The task to which the claimed utility model is directed is to increase the accuracy of test results by bringing experimental research closer to real ones, as well as expanding the possibility of testing, that is, testing both material, and thread, glue, or another type of connection of a garment.

2 The problem is solved in that in the test bench for seams

and materials we contain, we have a means for creating a constant force, equipped with clamps for the test material, which is connected with the measuring system; strain sensors, unlike the prototype, means for creating a constant force are functionally connected through the test material fixed in the clamps, a generator and equipped with strain gauges connected through an amplifier with a means for displaying information, a beam, and the generator and beam are made with the possibility of a fixed movement along the axis, pairs llelnoy test material, and the output shaft of the generator is configured to commit reciprocating translational oscillations.

In addition, the task is solved in that an oscilloscope is used as a means for displaying information.

The figure 1 shows a diagram of the proposed device.

The test material 1 is fixed with a screw pair 2 to the clamps 3, one of which is connected to the movable element 4 of the mechanical oscillation generator 5, which can be fixed on the frame 6 when the desired force is reached, which is determined on the oscilloscope 7 in the form of an electrical signal, As sensors, for example, strain gauge elements 8 are used, the signal from which first passes the required amplification through the strain gauge 9, while the sensors are glued to the strain gauge 10, the lower end of which is installed in a vice 11, placed on a fixed base.

The device operates as follows. The test material (sample) 1 is fixed using clamps 3, one of which is connected to the movable element 4 of the generator of mechanical vibrations 5, which performs reciprocating vibrations when the stand is turned on, thereby achieving a variable load component, then the generator or vice 11 is moved with the sensors 8 relative to generator until a certain constant force acts on the sample. There is also control of the constant and variable components of the force by constant tension to

3 buoy force with subsequent fixation in a given form and

signal amplitude. The measuring system is formed by sensors 8, amplifier 9 and oscilloscope 7.

The test result will be the number of strains that the product experiences for a certain period of time, for example, for one month, for one year. When repeating by testing these amounts of tension with constant monitoring, the deformation properties of the materials are determined using a measuring system. At the same time, a constantly acting force is controlled. With a certain amount of tension in the product, a deformation of the material, fibers will occur, therefore, we can judge the loss of presentation of the product. Continuing the tension, there will be an expansion of the joints, fibers of the material. This product will need repair. Ultimately, there will be a gap or tearing of the product material. Knowing the number of cycles before losing the presentation of the product, the manufacturer will be able to take measures to change it, and by the time of the gap, you can determine the life of the product as a whole.

Sources of information taken into account during the examination:

1. The certificate of authorship .№ 1462190, publ. in B. No. 8, 1989

2. Patent of the Russian Federation, N 2077718, publ. in B. No. 11, 1997 - prototype.

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Claims (2)

1. Test bench for seams and materials, containing means for creating a constant force, equipped with clamps for the test material, connected with a measuring system including strain gauges, characterized in that the means for creating constant effort is functionally connected through the clamped test material, the generator and equipped with strain gauges connected through the amplifier with a means for displaying information beam, and the generator and beam are made with the possibility of fixed movement along an axis parallel to the test material, and the output shaft of the generator is configured to perform reciprocating vibrations. 2. The stand according to claim 1, characterized in that an oscilloscope is used as a means for displaying information.