SU1622446A1 - Antiballon device for weft in shuttleless loom - Google Patents

Abstract

The invention relates to static electricity protection in the textile industry, can be applied to shuttleless weaving machines, and allows an increase in the effectiveness of the neutralization of static electricity charges. The cylinder limiter is a cylindrical plate with a bore thread guide for the weft yarn. The shield-screen is made up of alternating strips of insulating 3 and smoke-filled conductive 4 material. The thickness of the insulation material is 1-2 mm. In the process of winding the weft yarn, electrostatic charges of the same sign as on the winding yarn reversed on sectors of the insulation material, while on sectors of metal, charges of opposite magnitude are charged. threads. 1 hp f-ly, 2 ill. (L with

Description

1

This invention relates to static electricity protection in the textile industry and can be applied to shuttleless looms.

The purpose of the invention is to increase the efficiency of neutralization of static electricity charges.

FIG. 1 shows a balloon limiter, a general perspective view; in fig. 2 - an expanded flat image of the shield-shield and the electrical connection of the metal plates between themselves.

The shield-screen of the loom system is a cylindrical plate 1 with a thread guide-hole 2 for the weft yarn. The shield-screen is made of alternating strips of insulating 3 and grounded conductive 4 material. The thickness of the insulation material is I 2mm.

Removal of the charges generated by friction against the walls of the shield-screen of the thread, is carried out due to conductive grounded strips

The magnitude of the force of attraction of the thread to the sginka of the shield-screen, caused by electrification, can be determined by the formula

 + +

Emergency

in"

V (O

L Y -, / 9

 Y / Y-V Ј 1-1 2/21 + 2/7. e is the surface charge density at the shield of the shield-screen;

t is the linear density of the charges on the filament;

the dielectric constant of the shield shield material;

k ,, is the dielectric constant;

(h) the distance between the thread and the outer surface of the shield;

(i-j) is the distance between the thread and the inner surface of the shield;

n is the number of arithmetic members

amounts. shield wall thickness

LIIYIH shield-screen conductive (). about formula (1) takes the form

/ - #L / r $ e0 2.,

 J C-0 -Ј

As can be seen from the formula (1), the strength of the two components, the first (the strength of the action between the charge, IMH on the thread and ke-screen)

/ 7 (O S G) 1

  9

L. CQ

and second (force of interaction with charges on a thread and charges-images in the wall of the shield-screen)

Ј-4 "S /

FH.CЈZ

o

2le „1

Ј + 4

i + 2 "A

2/1 2

i4i

(p + i:

2 (

When the shield is conducted (when), this force is maximum and

fo2 t -3fe7 Ј

(five).

As can be seen from formula (1), the force F0 Foi + / 7u2 In the case of shield panels made of alternating strips of insulating and grounded conductive material, i.e., the force of attracting the thread to the wall of the shield screen becomes very small such that / roi- 0 and.

g

(delivered / roi,

L & o

since the surface density of the charge on the wall of the earth-conductive shield is a screen. Reducing the thickness of the insulator strips to 1 2 mm () leads to an increase in the formula (3) from the starch

20

9- с: у, Ј- 2 «+ i 2А, + 2лЛ and as it is with a minus sign, then the value

. Ј.-f- -U.25

B trf W (e + l) Z ()

l - 0 h Ј + i

jL

H2L, + 2 / gL

.

Thus Fo - / 7oi +.

o The thickness of the insulator strips cannot be less than I mm, since in this case the mechanical strength of the structure is reduced. With an increase in thickness above 2 mm, the effectiveness of charge neutralization decreases.

5 In the process of winding the weft yarn, electrostatic charges of the same sign as on the winding yarn are formed on the lecturers of insulating material, while charges on the sectors of the metal are opposite to those on the yarn. The force of interaction between charges on a thread and their reflections on sectors of metal is directed to the shield and contributes to the attraction of the thread to it. The interaction of the charges arising on

5 sectors of insulating material and threads, leads to the appearance of a force directed in the opposite direction. When these two forces are equal to each other, then electrostatic forces practically do not act on the winding-up thread.

0

Claims (1)

Invention Formula . A cylinder limiter for a weft yarn to a shuttleless loom containing a grounded metal plate with a central screen with a thread guide located in the center, characterized in that in order to increase the effectiveness of neutralizing the charges of static electricity, the screen consists of sectors converging to the thread guide and additionally has sectors of insulating material alternating through one with metal sectors and rigidly connected with the latter, with all sectors of the same shape. 2. A balloon limiter according to Claim 1, characterized in that the thickness of the sectors of the insulating material is 1-2 mm. /