SU1751234A1 - Device for controlling slide wedge of loom - Google Patents

Abstract

SUMMARY OF THE INVENTION: The device comprises a housing 1, an additional housing 2, coils 6, 7 of electromagnets, measles 10, a rod 13, a sliding wedge 14, two buttons, two resistors. 2 Il.

Description

The invention relates to a knit machine industry and relates to wedge systems, mainly circular machines.

In the known electromagnetic device for controlling the sliding gate wedge of knitting machines (prototype), the solenoid encompasses a permanent magnet with a weak coercive field and a large part of the core connected by a rod with a sliding gate wedge. When the solenoid is de-energized, the sliding wedge is pressed into the operating position by the spring. When the solenoid is excited by the switching element, it magnetizes the permanent magnet, which attracts the measles, with the result that the sliding wedge is sunk in the housing, occupying an inoperative position. When a demagnetizing impulse enters the solenoid, the sliding wedge is pushed from the body into the working position by a spring.

The disadvantages of such a device include a decrease in reliability due to the use of springs that are subject to fatigue phenomena. In addition, in the idle position of the sliding wedge, when it is recessed in the housing and attracted by a permanent magnet against the action of the spring, the solenoid must be constantly excited. If, however, the solenoid de-energizes, which may occur, for example, as a result of disturbances in the electric circuit, the permanent magnet is demagnetized and the sliding wedge is pressed by the spring to the working position at the moment not provided for by the program, which can lead to serious disturbances in the process. unkeep (needle sticking, needle needle breakage, web defects, etc.)

The aim of the invention is to improve the reliability of the sliding wedge

This goal is achieved by the fact that a ring permanent magnet is placed coaxially with an electromagnet in a device for controlling a sliding wedge of knitted machines in the case, in addition, the device is equipped with an additional case with an electromagnet coaxially placed in it and a ring permanent magnet, a nonmagnetic sleeve and a rod for a rigid interconnections of both housings and cores, respectively, resistors and a switching element, made in the form of switches, the first terminals of which are combined and connected to the negative th Schiessl

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power supply, the positive machine is connected to the midpoints of the coils of the electromagnets, and the second outputs of the switches are connected to the leads of the coils of the electromagnets.%

 FIG. 1 shows the device section; in fig. 2 - electrical circuit diagram of the switching element.

The device consists of a housing 1 and an additional housing 2, which are connected by a transition sleeve 3 of a nonmagnetic material. Solenoids 6 and an additional solenoid 7 with permanent magnets 8 and 9 are fastened in the housings using nuts 4 and 5. Inside the solenoids there is a bark 10 consisting of a core 11 and an additional core 12. The core 11 is connected by an actuating rod 13 to the gate valve 14, and a rod 15 of a non-magnetic material with an additional core 12, on the other side of which a guide rod 16 is installed. The sleeve 17 is integral with the housing 1 and is a guide for the sliding wedge 14, it is also intended for fastening the device inblock or sector of wedges knitting machine.

The device works as follows.

In the working position, the sliding wedge 14 is extended from the wedge case (Fig. 1), and the core 11 contacts the case 1, as a result of which the power lines of the permanent magnet 8 are closed through the metal and it fixes the bore 10 with the sliding wedge 14 in the working position.

The power lines of the permanent magnet 9 are closed through the air gap, therefore its fixing force is 10 - T5 times less than the force of the magnet 8, it can be practically neglected. When, in accordance with a given program, it is necessary to turn off the sliding wedge, i.e., to apply it to the inoperative position, in which it is recessed in the wedge case, impulses come from the switching element to the solenoids. The main impulse enters the additional solenoid 7 via button 15 (FIG. 2), and the auxiliary impulse through button 15 and resistor 16 enters the solenoid 6. In this case, the additional core 12 is pulled (Fig. 1) and the core 11 is pushed out against the action of the magnet 8, as a result of which the additional core 12 is pressed against the end of its body 2, the power lines of the permanent magnet 9 are closed through the metal and it fixes the bark 10 with the sliding wedge 14 in the idle position. When the sliding wedge is subsequently turned on, the main pulse is fed through the buttons 17 and 6, and the auxiliary - through 17 and the resistor 18 to the solenoid 7 (Fig. 2). As can be seen from FIG. 2, the positive power bus is connected to the midpoints of the coils of the electromagnets. When turned on 15, the current in the solenoids 6 and 7 passes from left to right through the right half of the coils. At the same time, the current passes through the solenoid 7 freely. This current is fundamental and serves to move the core. The current passing through the solenoid 6 has a much smaller value, since it passes through the resistance 16. This current is auxiliary and serves to neutralize the forces of the action of a permanent magnet on its core. When you turn on the 17 current in the solenoids passes from right to left through the left half of the coils. At the same time through the solenoid 6 passes the main current, and through the solenoid 7 - auxiliary. The circuit in FIG. 2, when one electromagnet is switched on, a small current pulse is applied to the other electromagnet to break the magnetic circuit of the permanent magnet, which is necessary for the movement of the core.

Compared to the prototype device, this device has a higher reliability in operation, since it does not require the use of springs subject to mechanical wear. In addition, the reliability of operation is enhanced by the fact that in such a device after the arrival of pulses from the control circuit i and switching the sliding wedge, the solenoids remain de-energized, while in the prototype device there is a solenoid that holds the measles with the sliding wedge in the off position against the action of the spring, must be constantly excited.

It should also be noted that in the proposed solution the permanent magnets do not depend on electromagnets and fix the moving cores in the selected position by their magnetic fluxes, which do not change depending on the presence or absence of current in the solenoids. In the prototype device, a permanent magnet is an integral part of an electromagnet, and its magnetic flux is either amplified or weakened by a solenoid.

Claims (1)

Invention Formula The control unit for the sliding wedge of the knitting machine, comprising a housing with an electromagnet installed in it, the measles of which is kinematically connected with the sliding wedge, and a switching element, characterized in that contains an annular permanent magnet placed in a housing coaxially with an electromagnet, an additional case with an electromagnet and an annular permanent magnet coaxially placed in it, a nonmagnetic sleeve and a rigid coupling rod between both cases and Korea, respectively, and resistors, and the switching element is designed as switches, the first outputs of which are combined and connected to the negative power rail, are polo The main bus is connected to the midpoints of the coils of electromagnets, the second output of the first switch is connected to the first output of the additional coil of the electromagnet and through the first resistor to the first output of the coil of the electromagnet, and the second output of the second switch is connected to the second output of the coil of the electromagnet and through the second resistor to the second output of the coil additional electromagnet. .sixteen 12 - / -Gu TO Fmg one kA 48 Ltbl  -tV - /five Fi. & ±