RU1798400C - Device for pulling out filament - Google Patents

Abstract

SUMMARY OF THE INVENTION: A device for pulling a thread comprises a pressure roller, a feed roller, exhaust thread conductors, each of which is fixed to the first corner with screws, and an additional thread guide. The latter is installed in the cold drawing area of the thread, is screwed to one of the bushings mounted on the second corner. The second corner is connected to the first corner by means of a bolt. The device comprises an exhaust disk and an accompanying roller. 4 ill.

Description

The invention relates to the production of man-made filaments, and in particular to devices for drawing a melt-formed chemical filament.

The purpose of the invention is to improve performance while improving yarn quality.

Figs. 1 and 2 show an embodiment of a device with a multistage change in the position of the filament conductor in the horizontal direction with an Ii / I0 ratio of 1-3; in FIG. 3 is a variant of a device with a single-stage change in the position of the filament conductor in the vertical direction with an I / 10 ratio of 1-5; in FIG. 4 shows the dependence of the change in relative strength P on the value of H / I0.

The criterion for justifying the interval 1-5 is the realization of the maximum possible strain rate of the thread and the convenience of servicing the workplace when refueling the thread on an additional thread conductor.

An increase in the ratio of more than 1 increases the efficiency of the device. In this case, an increase in Ii / I0 leads to a decrease in the strain rate, which makes it possible to fully realize the strength properties of the thread. If the ratio Ii / I0 is increased to 5, the strain rate decreases noticeably and the strength properties of the thread increase. However, with a further increase in the II / IQ ratio, certain difficulties arise in threading the thread onto an additional thread guide (see Fig. 3), because in this case, the thread conductor is at a sufficiently large distance from the exhaust ducts and from the exhaust biscuit.

The proposed device (Fig. 1 and 2) for pulling the yarn 1 contains a pressure roller 2, a feed roller 3, two exhaust thread conductors 4, each of which is fixed to the corner 5 with screws 6, as well as an additional thread conductor 7, representing a rotating roller or a fixed glass or meso G

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ceramic coated sticks designed to increase the length of the cold draw zone. An additional thread conductor 7 in the first embodiment (Fig. 2) is fastened with a screw 8 in one of the bushings 9 mounted on the corner 10, which is connected to the corner 5 by means of a bolted connection. 11.

, An additional thread conductor 7 in the second embodiment (Fig. 3), simultaneously playing the role of the second exhaust thread guide 4, is screwed to the movable rod 13 with a piston 14 moving vertically inside the cylinder 15, into which, depending on the direction of movement rod 13 up and down, compressed air is supplied to one of the nozzles 16.

The device also includes an exhaust disk 17 and an accompanying roller 18,

The device operates as follows.:

The formed thread 1 enters the pinch roller 2, covers it with two to three turns, and, passing the feed roller 3, the thread is threaded to the exhaust thread conductor 4 (Fig. 3 or the exhaust thread conductors 4 (Fig. 1, 2). envelopes them and then goes to an additional thread conductor 7, after which the thread is fed to the exhaust disk 17V

In a section of length And between the additional thread guide 7 and the exhaust disk 17, the thread is drawn at a strain rate,, which is inversely proportional to the length H of the cold drawn draw zone. With an increase in the length And of the cold draw zone, the tension of the thread in this section decreases, which leads to a decrease in the tensile stress and, therefore, an increase in the length L of the neck in the thread during its transition from an unextracted to a partially elongated state. An increase in the length L of the neck in the thread with an increase in the length H of the cold draw zone ultimately leads to a decrease in the rate of deformation of the thread in this section. The regulation of the strain rate s by changing the length h of the cold drawing zone to the value Ii / I0 3 can be achieved by moving the position of the additional thread guide 7 in the horizontal direction relative to the exhaust disk 17 (Fig. 1). In this case, the thread conductor 7 is installed in one of the bushings 9, which can be located

along the length of the corner 8, for example, at a distance of 80 mm from each other in an amount of three, which is a sufficient condition for carrying out the control process of drawing

filaments with the set strain rate. When; if it is required to lower the strain rate to lower values, the number of sleeves 9 can be increased. It has been experimentally established that

an increase in the length AND of the stretch zone of the thread relative to its initial length 0 should correspond to the ratio M / I0 1-5. In order to conveniently thread the thread on the thread conductor 7 and to obtain higher H / I0 values exceeding the value 3, the position of the thread conductor 7 (Fig. 3) is changed in the vertical direction. In this case, the thread conductor 7 is mounted on the rod 13, the piston 14

which, using compressed air supplied to the lower fitting 16 of the cylinder 15, will occupy the upper position.

The use of the inventive device for drawing the thread allows to increase

physical and mechanical properties of an elongated thread. In FIG. 6 shows the test results of the 187 tex technical thread obtained from the KVSh-250-KA spinning and drawing machine at the Grodno POKHV, in which the prototype of the exhaust mechanism was used. From the FIG. 4 graphs show that with increase

- the length of the zone of deformation of the filament from Io (li / I0 1) in the prototype to li (H / lo 5) the absolute strength P of the filament rises to 3 g / tex in relative units of strength, which confirms the advisability of using the claimed device in the technology threads.

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Formula and Device for drawing a chemical thread, containing an exhaust disk and exhaust thread conductors, characterized in that, in order to improve operational properties while improving the quality of the thread, it contains an additional thread conductor installed in the area between the exhaust

with respect to them, the ratio of the maximum distance between the additional conductors and the exhaust disk to the distance between the exhaust conductors and the exhaust disk is 1-5.

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