Electromechanical switching apparatus for elevator installations utilization load in concrete mixers. (Machine-translation by Google Translate, not legally binding)

摘要

Electromechanical maneuver for lifting device for use in concrete loading installations in concrete mixers, of the type that are powered by a three-phase main line with a differential general switch for a motor of a hydraulic pump with its corresponding three-phase thermal relay, and from which a single-phase power supply is derived to 220 volts for switchgear, and from this other single-phase, low-voltage power supply through the corresponding transformer, inserting in the main single-phase line the corresponding thermal relay; characterized in that in the main line are interposed, first in series, two emergency switches for cutting the power, one located in the cabin of the elevator, interlocked, and another in the control panel; then, in parallel, there are two supplies for a relay for connecting the hydraulic pump motor, a pilot light for the three-phase thermal relay, a de-energized maneuver relay, another for lowering maneuvers, the coils for both up-and-down solenoid valves and lowering, an auxiliary climb-up auxiliary relay, another down-turn auxiliary relay, a down-direction override safety relay, a down-direction safety override warning light, a truck presence relay and a timed relay of no truck presence; of the single-phase line of small voltage are parallel unlocking relays of two separate electrolocks for opening access doors to the cabin and access to the work area; in the supply to the motor relay of the pump is interposed, in parallel, two open contacts at rest of the up and down relays, and in series an auxiliary open contact at rest of the three-phase thermal relay, also feeding this line in parallel light of operation of the motor, in whose branch an open contact is interposed at rest of the relay of the motor of the pump; in the power supply to the tripping pilot light of the three-phase thermal relay a contact is inserted, closed at rest, of said relay; in the supply of the rise maneuver relay, two closed contacts at rest of the auxiliary relays for rising operation and the descending relay are inserted in series in series with the previous ones, and in parallel with each other, two pushbuttons in the cockpit and control panel, an auxiliary contact open at rest of feedback of the relay itself and an open contact at rest of the time relay of the presence of the truck; in the supply line of the down-link relay, three open contacts in standby of the down-switch auxiliary relay, the down-over-over-time safety relay and the relay in the presence of the truck, and a closed contact are interposed first and in series. At rest of the up-link relay, and in series with the previous ones in parallel between each other, push-buttons in the cockpit and control panel and a feedback contact of the relay itself; in the supply lines to the coils of both up and down solenoid valves, respectively, normally open contacts of the up and down relays are interposed; in the power line of the auxiliary relay for the rise maneuver, a cabin travel limit switch, open at rest, is inserted; in the supply line of the auxiliary relay for downward maneuvering, a closed contact at rest activated by a sensing photocell is inserted into a part of the truck; in the power supply of the overtravel over-travel safety relay, a closed contact is interposed at rest and activated by a second detection sensor of the truck when descending in overtravel of the cab; in the power supply of the actuation light of the overcurrent safety relay on lowering, a closed contact is inserted at rest of the overturning safety relay on descent; in the supply of the truck's presence relay an open contact is interposed at rest and activated by a photocell that detects the presence of the truck under the platform; in the feeding of the timed relay of the non-presence of the truck, two closed contacts are interposed at rest of the relay in the presence of the truck and of the auxiliary relay for maneuvering in descent; in the power supply of the door access door latch relay, an open contact is inserted at rest of the maneuvering relay on the rise and a button on the access to the cabin; in the power supply to the latch relay of the access door to the work area, a closed contact is put in series at rest of the auxiliary maneuver relay in rise, another open contact in rest of the relay of presence of the truck, as well as a pushbutton accessible from an area near the access door to the work area. (Machine-translation by Google Translate, not legally binding)