SU661628A1 - Apparatus for enhancing solenoid operability - Google Patents

Description

one

The invention relates to devices for increasing the operability of contacts of electromagnetic relays during their operation, for example, on automatic telephone exchanges.

During equipment operation, as a result of interaction of the material of the contacts of electromagnetic relays, such as silver, with aggressive components of the environment, poorly conducting films are formed on the contact parts, which leads to an increase in the resistance of the contacts and, consequently, to a deterioration of the conditions of the passage of signals with low levels voltage and current through them.

Mechanical removal of films from the surface of contact parts (cleaning) by various methods is laborious and inefficient, since the films on the surface of contact parts are quickly restored.

Technical solutions are known, according to which, to prevent the formation of poorly conducting films, a thin layer of noble metals, such as gold, is applied onto the surface of the contact parts by the electric spark method 1, 2. This method 1 and device 2 make it possible to apply a protective layer of noble metal to the surface contact parts, without dismantling the equipment, which makes it possible to use them in operating conditions. The device 2 contains an electromagnetic vibrator of crushed U-shaped iron, on the bark of which is located for fastening a movable electrode of a noble metal. The stationary electrode is fixed to the housing and serves as a support for the upgraded contact details. A movable electrode, made in the form of a noble metal strip with a cross section of 1 X 4 mm and a length of 50 mm, is located in the holder groove and is pressed to the holder with a screw. During operation of the device, as the precious metal is consumed, the clamp is loosened and the noble metal strip is manually moved along the groove to its original position. This device is primarily intended for applying a noble metal alloy to

Claims (1)

0 contact-detail relay type and on cuts knives decade-shagovyl seekers. The design of the electrodes and the method of their attachment do not allow this device to apply noble metals on the contact parts of other relays, in particular the relay RZS-14, having smaller dimensions, another design of contact details and limited access to them. In addition, the use of a movable electrode of the noble IU. talles in the form of a 1 x 4 mm strip creates additional difficulties, since such bands are not produced by the industry and must be made to special orders. The limitation of the length of the electrodes reduces the utilization rate of the noble metal, as a result of which technological waste compresses, is 10-15 ° / o. Operation with the device is also hampered by the fact that in order to move the electrode as it is consumed, it is necessary to unscrew the fixing screw of the electrode each time and manually advance it. And to adjust the gap between the electrode and the contact, a moving or stationary electrode must be bent. The aim of the invention is to reduce the size of the device and discourage the use of it to improve the performance of compact relays. For this, the movable electrode holder is made in the form of a tube, and a noble metal wire passing inside the tube is used as a movable electrode. ; To advance the noble metal wire inside the tube, it can be made with a slot, and a knurled drum interacting through the slot with a moving electrode can be additionally installed on the outside of the tube near the slot. The stationary electrode can be made in the form of one of the arms of the lever, the other arm of which is spring-loaded and rests on a screw stop. The device can be equipped with a tube installed at the end of the tube opposite to its working end, the coil on which is wound with a wire of a noble metal. FIG. Gschematically depicted device; in fig. 2 - device layout. The device for improving the operability of the relay contacts is made in the form of a pistol and contains an electromagnetic vibrator 1, the bark 2 of which is rigidly connected to the holder of a movable electrode made in the form of a tube 3. A wire 4 of a noble metal, which is a movable electrode, passes through tube 3. The tube 3 is made with a slot, around which on the outer side of the tube there is a drum 5 with a thread that contacts the noble metal wire 4 through the slot in tube 3 and serves to pull the wire inside the tube 3. The axis b of the drum 5 with knurling in the outer side can be driven into rotational motion, while moving the movable electrode to its original position for operation. The fixed electrode 7 serves as a holder or support for the contact piece to be improved 8. Through the rotary cylinder 9, the fixed electrode 7 is connected to the lever 10, which serves to adjust the distance between the wire 4 and the fixed electrode 7. The lever 10 is pressed upwards by the spring 11, and on top of it presses the screw 12, which provides the required distance between the wire 4 and the stationary electrode 7. The reserve of the wire 4 of noble metal is wound on the coil 13. The device operates as follows. Before starting work, screw 12 adjusts the gap between the wire 4 and the fixed electrode 7, which is necessary to improve the specified contact piece 8. The device approaches the relay so that the contact piece 8 is fixed in the fixed electrode 7. When the electromagnetic vibrator 1 is turned on, the end of the wire 4 protruding from the tube 3 vibrates over the surface of the contact part 8. An electric spark occurs between the wire 4 and the surface of the contact part 8, resulting in a wire transfer material ton on the contact surface of the part, ennobling it. The whole process takes 5-10 seconds. As the material of the moving electrode is consumed, it is necessary to twist the axis 6 of the drum 5 with knurling to move the wire 4 through the channel of the tube 3. The device has a simple structure that is convenient and reliable in operation. Its dimensions are reduced. By reducing the size and changing the design of the electrodes, it was possible to improve the contact details of different relays, including small-sized relays with difficult access to contacts and relays with contact details of different heights. In the device as a moving electrode can be used wire from a noble metal, in particular gold wire with a diameter of 0.7 mm according to GOST 7222-54, produced by industry. By increasing the length of the electrode (the wire margin is wound on the roll), the utilization rate of the precious metal is increased. Thanks to the introduction of a knurled drum, which fixes and advances the wire in the tube, as well as the introduction of adjustment of the distance between the electrodes, the conditions for working with the device were made easier. Claims 1. Device for enhancing the performance of contacts of electromagnetic relays by applying to their surface