SU117346A1 - Time relay to conveyor bakery oven drives - Google Patents

Description

The known time relays to the drives of conveyor bread-baking furnaces, which include a magnetic starter and a contact pair connected to the electric motor, and a screw pause mechanism with a plate spring and a mechanism for controlling the activation of the electric motor, do not have sufficient accuracy of operation.

The described time relay improves reliability and accuracy of operation.

This is achieved by the fact that the mechanism for controlling the activation of an electric motor is made in the form of a hingedly suspended, closed at the ends, tubular rocker arms, partially filled with liquid oil and inside divided by a partition with a calibrated orifice into two halves, additionally connected with each other by an inclined set overflow pipe.

FIG. 1 shows a time relay circuit; in fig. 2 - tubular rocker.

The time relay is connected to the electrical circuit of the electric motor driving the baking oven conveyor. It contains a magnetic starter (not shown in the drawing), a contact pair / and 2 and a pause mechanism 3 for adjusting the pause shutter speed, which has screw 4 with a button 5, a plate clip 6 and a signal lamp 7 with contacts 8.

The mechanism for controlling the activation of the electric motor is made in the form of a tubular rocker arm 10 freely illuminated on the axis 9, which is closed at the ends by the plugs 11, into one of which the sliding roller 12 is embedded on the axis.

The tube of the rocker arm 10 is partially filled with liquid oil and inside is divided by a partition (coupling) 13 equipped with a calibrated orifice. The partition 13 divides the tubular arm into two halves.

№ 117346

which complement & 1 communicates with each other by the inclined overflow nozzle 14. In the upper part of the rocker arm 10 there are two tubes 15 for communication with the atmosphere.

With the horizontal position of the tubular rocker 10, the liquid oil is in the left half of the tube. Gradually, through the hole in the partition 13, the oil flows from the left half of the tube to the right. When STOiM is right, half of the rocker tube is lowered and the slip roller 12 rests on the spring 6 of the pause mechanism 3. As the load on the leaf spring 6 increases, it straightens, the rocker 10 breaks off and sharply closes the contacts / and 2. The magnetic starter works, and electric motor drives the baking oven conveyor. At this time, the cam 16 of the main gear 17 of the conveyor, with its rotating roller, presses the left end of the tubular rocker arm 10, as a result of which the liquid oil in the tube flows from the right half to the left. Bringing the left part of the rocker tube to the lower extreme position, the cam 16 jumps off the rocker arm and it assumes a horizontal position. At this moment, the cam 18 of the gear 17 interacts with the limit switch / I and the furnace conveyor stops.

Subject invention

Time relay to conveyor bakery oven drives, including a magnetic starter and contact pair connected to an electric motor, a screw pause mechanism with a plate spring and a mechanism for controlling the activation of an electric motor, in order to increase reliability and accuracy of operation, a mechanism for controlling the activation of an electric motor made in the form of a pivotally illuminated, closed at the ends, tubular rocker, partially filled with liquid oil and inside a divided burnout dkoy calibrated hole into two halves, additionally communicating between themselves obliquely mounted overflow pipe.