SU425747A1 - MECHANICAL RELAY - Google Patents

Description

The invention relates to the field of automation, namely to the design of a mechanical relay. A mechanical relay is known predominantly for controlling a welding or welding machine that contains a driven shaft mounted in a housing and a control cam rigidly connected to a rotating element acting on stationary electrical contacts, as well as a switching electromagnet consisting of a fixed coil and a spring-loaded core. The aim of the invention is to simplify the design of the mechanical relay. This is achieved by the fact that the bark of an electromagnet is made in the form of a ring mounted coaxially with a roller, inside of which is a driven shaft, which interacts with a rotating element. FIG. 1 shows the proposed relay in section; in fig. 2 shows a section along A-A in FIG. 1. The proposed relay contains an electromagnet consisting of a coil 1 with poles 2 and 3 of a magnetic core and a ring 4 made in the form of a ring, connected with springs 5 and limiters 6. Anchor 4 has a plate spring 7 that interacts with ring 8, to a ball planetary-friction gearbox consisting of a driven shaft 9, balls 10, a pivoting element 11 with a control cam 12. The treadmills for balls are made on the ring 8 and the central pole 2 of the magnetic circuit of the electromagnet. The rotary element 11 is connected by a return spring 13 to the body 14 of the mechanical relay and is located under the bracket 15 on which the plate springs 16, 17 and the microswitch 18 are fixed. Outside the microswitch is closed by a casing 19 equipped with a directional arrow 20, a spring stop 21 and a stopper 22. Flange 23 for fastening the mechanical relay closed by a button 24. The end of the driven shaft 9 interacts with the drive shaft 25 of the main mechanism. At the moment of turning on the coil 1 of the electromagnet, the bark 4 is attracted to the poles 2 and 3, the ring 8 is carried away by the plate spring 7. The ring 8 presses against the balls 10 and eliminates the gaps between the balls 10 and the driven shaft 9, as well as between the balls 10 and the electromagnet poles 2 . The drive shaft 25 drives the driven shaft 9 through the ball 9, which rolls along the treadmills of the ring 8 and the electromagnet pole 2 and rotates the rotary element I with the control cam 12. After the predetermined number of revolutions of the driven shaft 9

The cam 12 reaches the spring 17 and switches the microswitch 18. In the case of continued rotation of the drive shaft 25 when the electromagnet is on, the control cam 12 will rest against the bracket 15 and stop. The failure of the mechanical relay is prevented by slipping the surface of the drive shaft 25 relative to the mating surface of the driven shaft 9. When the electromagnet is turned off, the measles 4 returns to their original position under the action of the springs 5, the mechanical force closure of the ring 8, balls 10, pole 2 and the driven shaft 9 stops and pivots the element And with the control cam 12 under the action of the spring 13, releasing the spring 17 of the microswitch 18, returns to the initial position up to the spring stop 21. Reset the specified number of revolutions of the lead until the microswitch 18 is turned off, the casing 19 carrying the stop 21 and the arrow 20 moving relative to the scale 24 are rotated. The casing 19 is fixed relative to the flapping 23 by the stopper 22. The driven shaft 9 is pressed against the torpedo shaft 25 by a spring 16.

Subject invention

Mechanical relay mainly for controlling welding or surfacing

a machine containing a driven shaft mounted in the housing and a control cam rigidly connected to the pivot element acting on the fixed electrical contacts, as well as a switching electromagnet consisting of a fixed coil and a spring-loaded core relative to it, in order to simplify the design , The electromagnet measles is made in the form of a ring mounted coaxially

with a coil, inside which is located the driven shaft, interacting with the rotary element.

23

/five

fff

/ 7

FIG. 2