RU74390U1 - DEVICE FOR DETERMINING THE TORQUE OF YARN AND THREADS - Google Patents

Abstract

A device for determining the torque of yarn and threads containing a fixed support having a device for turning the end of the thread associated with the test sample, connected in series with an auxiliary sample that does not have twist, but is close in thickness and stiffness to the test sample, block, load, a sensitive element made in the form of a self-loading arrow attached at the junction point of the test and auxiliary samples, and an arrow deflection angle meter located in the immediate block Soest from it. Using this device allows to increase the accuracy of determining the magnitude of the torque of yarn and threads and its relaxation process. 3 ill.

Description

The utility model relates to spinning textile industry.

The measurement of the torque of yarn and threads is necessary when studying the conditions of their formation and evaluating the parameters of product quality. It allows you to reveal the causes of the formation of succrutin yarn and predict its suitability for subsequent technological operations.

A device for measuring the torque of a moving yarn and thread is known, in which the test sample is looped into the feed rollers and the movable load roller. Under the action of the load, the loop with the movable roller rotates, forming an angle, the change of which is recorded using electrotensometric equipment [1]. However, during the measurement process, a measurement error occurs due to a change in the geometric position of the yarn loop in space and a change in the angle of inclination of the yarn branches, and, consequently, the total resulting torque component from the yarn branches to the movable roller. In addition, to ensure the accuracy of measurements, a constant calibration of the strain gauge is necessary, which cannot be done without stopping the measurement process. Therefore, long-term measurement of the torque of a moving yarn and thread leads to an increase in measurement error.

The prototype is a device for determining the torque of yarn and threads, containing: a support, an electro-strain gauge, a block, a load [2]. However, the presence of tensometric equipment also does not allow the measurement process to be carried out in a long-term mode (more than

30-40 minutes). The duration of the measurement process is necessary to assess the relaxation parameter of yarn and thread after the technological process of its formation, the change of which can occur over a period of time from several hours to several days. The presence of tensometric equipment suggests a periodic calibration process and is applicable for short-term measurement of any parameter. In addition, this device is inconvenient to use in a production environment.

The technical result of the invention is to increase the accuracy of determining the magnitude of the torque of the yarn and threads and its relaxation process.

The specified technical result is achieved by the fact that in the device for determining the torque of yarn and threads, comprising: a fixed support having a device for turning the end of the thread associated with the test sample, connected in series with an auxiliary sample that does not have twist, but close in thickness and stiffness to the test sample, block and load, according to the utility model, the sensing element is made in the form of a self-loading arrow attached at the junction of the test and auxiliary image tsov and located in close proximity to the measuring instrument of an angle of deviation of an arrow.

Figure 1 shows a General view of the inventive device;

figure 2 shows the meter angle of deviation of the self-loading arrows;

figure 3 presents a diagram of the power load of the self-loading arrows. The device includes: a device 1 for turning the end of the thread installed in the support 2 having a fixing screw 3, and connected with the test sample of yarn or thread 4, connected in series with the auxiliary sample 5, without twist, but close in thickness and stiffness to the subject sample 4, (for example, fishing line) (figure 1). At the junction of test 4 and auxiliary 5 samples, a self-loading arrow 6 is fixed, which is a thin

a cylindrical rod, in the immediate vicinity of which the deflection angle meter 7 of the arrow 6 is installed. The meter 7 is an angular scale 8 and the deflection angle limiter 9 of the arrow 6 (FIG. 2). Subject 4 and auxiliary 5 samples are loaded with axial tensile force by means of load 10, and auxiliary 5 is thrown over block 11.

The device operates as follows. The loose end of the test sample 4 (a piece of yarn or thread) under the action of an elastic torque M _kr tends to deflect the self-loading arrow 6 from a vertical position. The deflection angle of the arrow 6 is determined by the angle degree scale 8 of the meter 7, which has a limiter 9 of the deflection angle of the arrow 6 to 90 °. The limiter 9 is necessary to prevent the self-loading arrow 6 from turning over and untwisting the turns of the yarn test sample 4. The self-loading arrow 6 tends to occupy a vertical position under the action of its own weight P _c , but it has a torque M _cr from the side of the yarn test sample 4. As a result, arrow 6 starts to deviate from a vertical position until a balancing torque arises in it from the action of a force of weight P _s (Fig. 3). The magnitude of the torque M _cr , which has a test sample of yarn or thread 4 is calculated by the formula:

M _cr = P _s L _s / 2sinα

where: M _cr - the torque of the test yarn or thread (SN mm);

P _with - the weight of the self-loading arrows (SN);

L _c is the length of the self-loading arrow (mm);

α is the angle of deviation of the self-loading arrow from the vertical position (degrees).

In the event that, when measuring the magnitude of the torque, the arrow 6 rests against the limiter 9 and the measurement process is interrupted, it is necessary to use the self-loading arrow 6 with a large dead weight P _c to carry out the measurement process.

Information sources

1. S. - G.S. Zareckas. A device for measuring the torque of a moving thread // Copyright certificate No. 3666368. - Published on January 16, 1973., Bulletin No. 7.

2. Marigolds Yu.K. A method for determining the torque of a thread and yarn // Patent for the invention of the Russian Federation No. 2225466. - Published 2004. Bulletin No. 7.

Claims (1)

A device for determining the torque of yarn and threads containing a fixed support having a device for turning the end of the thread, connected to the test sample, connected in series with an auxiliary sample that does not have twist, but which are close in thickness and stiffness to the test sample, block and load, characterized in that the sensitive element is made in the form of a self-loading arrow attached at the junction of the test and auxiliary samples and located in the immediate vicinity of the meter By dividing the angle of deviation of the arrow.