JP2012184043A - Elevator apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator apparatus that is constituted so that a proper dynamic brake force can be generated in a motor of lifting equipment when an elevator car is moved by an offset load.SOLUTION: A rope 19 for connecting the elevator car 12 and a balance weight 18 which are provided in a hoistway 14 so as to be ascendable and descendable is looped over the lifting equipment 17. The elevator apparatus lifts and lowers the elevator car 12 by the rotation of the lifting equipment 17. The elevator apparatus includes a switch 25B that is put into an on-state when electric power supply to the motor of the lifting equipment 17 is shut off, and a dynamic brake circuit 27 that connects a resistance 26 to a feed line 21 via the switch 25B and that brings about the consumption of an electromotive force from the motor. Additionally, a brake 22 of the lifting equipment 17 is released by an operation of a rescue operation switch 23 provided in the elevator car 12 to move the elevator car by the offset load with respect to the balance weight 18. In the movement of the elevator car 12, a dynamic brake control section 11C monitors a rotational speed of the lifting equipment 17, and increases a value of the resistance 26 by a resistance value switching circuit 28 when the rotational speed exceeds a preset speed.

Description

  Embodiments of the present invention relate to an elevator apparatus having a rescue operation function of moving a car stopped between floors to the nearest floor.

  When a power failure occurs during a disaster, power supply to the motor that drives the hoisting machine of the elevator is cut off, and a brake provided in the hoisting machine is operated, so that the operating elevator stops. At this time, if the elevator car stops between the floors, the passenger is trapped in the elevator car stopped between the floors. In such a case, it is necessary to move the car to the nearest floor and rescue the passenger.

  As a method of this rescue operation, it is considered that a brake provided in the hoisting machine is released, and the car is moved by an unbalanced load generated between the car and the counterweight. Recent hoisting machines have a structure in which a sheave for wrapping a rope without a gear mechanism is directly connected to the rotating shaft of a driving motor, so the motor rotates even with a slight uneven load. The method has come to be adopted. In this case, it is known that electric power generated by a motor that rotates with an unbalanced load is caused to flow through a resistor to function as a dynamic brake to suppress the moving speed of the car (for example, see Patent Document 1).

JP 2001-146369 A

  In the above-described dynamic brake, since the value of the resistance that consumes the electric power generated by the motor is constant, it is difficult to set the resistance value. That is, when the resistance value is large, the braking force increases, and the motor does not rotate and the car cannot be moved with a slight uneven load. On the contrary, when the resistance value is small, the braking force is also small, and the moving speed of the car cannot be suppressed.

  The problem to be solved is to provide an elevator apparatus configured so that an appropriate dynamic braking force is generated in a motor of a hoisting machine when a car is moved with an unbalanced load.

  According to the embodiment of the present invention, a rope connecting a car and a counterweight provided in the hoistway so as to be able to move up and down is wound around the sheave of the hoist and the car is rotated by the rotation of the hoist. An elevator device that has a switch that is turned on when power supply to the motor that drives the hoisting machine is cut off, and a resistor is connected to the power supply path to the motor via this switch. The dynamic brake circuit for consuming the electromotive force from the motor, and provided in the car or outside the car, the operation releases the brake of the hoisting machine that is in an operating state when a power failure occurs. Rescue operation switch that moves the car due to an unbalanced load with the counterweight, and when the car moves due to this unbalanced load, the rotation speed of the hoisting machine is monitored, and the rotation speed is set to a preset speed. When obtaining, characterized in that a dynamic brake controller for controlling the resistance value switching circuit in order to increase the value of the resistance of the dynamic braking circuit.

It is a circuit diagram which shows the principal part structure of the elevator apparatus which concerns on one embodiment of this invention. It is a schematic block diagram. It is a figure explaining schematic structure of one embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described.

  First, a schematic configuration of the entire elevator system according to this embodiment will be described with reference to FIG. In FIG. 2, a hoistway 14 is provided in a building 10, and an elevator car (hereinafter simply referred to as a car) 12 and a counterweight 18 are raised and lowered by guide rails (not shown) in the hoistway 14. It is provided as possible. The car 12 and the counterweight 18 are connected to each other by a rope 19 wound around a sheave of the hoisting machine 17, and are driven up and down by the rotation of the hoisting machine 17.

  Hall elevator registration devices 15 are provided in the elevator halls on each floor where the car 12 of the building 10 can stop. In the car 12, a car call registration device 16 for specifying a destination floor by a passenger's operation is provided. The elevator operation control device 11 is connected to the hall call registration device 15 and the car call registration device 16 through the transmission line 13 respectively, and the hoisting machine is operated in response to calls from the hall call registration device 15 and the car call registration device 16. 17 is controlled to move the car 12 to the destination floor.

  FIG. 1 shows a main circuit configuration of a hoisting machine 17 that is operation-controlled by the operation control device 11. The operation control device 11 includes a main circuit control unit 11A, a brake control unit 11B, and a dynamic brake control unit 11C for the hoisting machine 17. The main circuit control unit 11A supplies power to the power supply path 21 in order to rotate the hoisting machine 17 forward or backward in response to the call from the hall call registration device 15 and the car call registration device 16 described above. A rope 19 that connects the car 12 and the counterweight 18 is wound around the sheave of the hoisting machine 17, and these are driven up and down by the rotation of the hoisting machine 17.

  The hoisting machine 17 is provided with a brake 22. The brake 22 is supplied with power to the motor of the hoisting machine 17, and when the hoisting machine 17 raises and lowers the car 12, an electromagnetic coil (not shown) is excited by a command from the brake control unit 11B, and is in an open state (non-braking state). It becomes. On the other hand, when a power failure occurs, the electromagnetic coil is demagnetized, so that the operation state (braking state) is entered, and the hoisting machine 17 is braked to stop the movement of the car 12. Of course, not only at the time of a power failure, but also when the car 12 is landed on the intended floor, braking control is performed by the brake control unit 11B, and the car 12 is stopped at the landing position.

  In the car 12, a rescue operation switch 23 is provided that is operated when confinement occurs during a power failure or the like. This rescue operation switch 23 releases the brake 22 of the hoisting machine 17 that is in an activated state by turning it on, and moves the car 12 due to an unbalanced load with the counterweight 18. The call registration device 16 is provided with other call buttons (not shown).

  Further, although not shown, landing zone detection means is configured between the car 12 and the hoistway 14. The landing zone detection means detects that the car 12 has entered the landing zone when it enters the landing zone of the nearest floor. Then, when the landing zone detecting means detects that the car 12 has entered this landing zone due to the above-described movement due to the unbalanced load, the detection result is notified by the notifying means provided in the car 12. Configure.

  Further, although not shown in the figure, announcement means for announcing the above-described rescue operation by releasing the brake when there is a confinement in the car 12 when a power failure occurs may be provided in the car 12.

  Returning to FIG. 1, the power supply path 21 for the motor of the hoisting machine 17 is provided with switches 25 </ b> A and 25 </ b> B that are turned on / off in conjunction with each other. Among these, one switch 25 </ b> A is turned on when rotating the hoisting machine 17, and supplies power to the motor of the hoisting machine 17. At this time, the other switch 25B is turned off. The other switch 25b is turned on when one switch 25A is turned off and the power supply to the hoisting machine 17 is cut off, and the resistor 26 is connected to the power supply path 21 to form the dynamic brake circuit 27. The dynamic brake circuit 27 is provided with a resistance value switching circuit 28 for switching its resistance value. The resistance value switching circuit 28 switches the resistance value by turning on / off a switch 28a provided in the circuit according to a command from the dynamic brake control unit 11C. The dynamic brake control unit 11C receives the rotational speed of the hoisting machine 17 from a rotation detector 29 provided in the hoisting machine 17, and when this rotational speed exceeds a preset value, the resistance value switching circuit 28 To increase the resistance value of the dynamic brake circuit 27.

  Note that the operation control device 11 is connected to the battery 30 as a power source for securing a certain range of control functions and operation functions even during a power failure.

  In the above configuration, when a power failure occurs due to a disaster or the like during operation of the elevator, the power supply to the hoisting machine 17 is stopped and the brake 22 is operated. Therefore, the car 12 moving in the hoistway 14 is in the hoistway 14. Stop at. In addition, because of the power failure, the operating power of the switches 25A and 25B is lost, so the switch 25A returns to the off state and the switch 25B returns to the on state. For this reason, the dynamic brake circuit 27 including the resistor 26 is connected to the power supply path 21.

  At this time, if the stop position of the car 12 is between the floors, passengers in the car 12 are trapped between the floors. Therefore, it is necessary to move the car 12 to the nearest floor.

  In this case, the rescue operation switch 23 provided in the car 12 is operated. By this operation, the electromagnetic coil of the brake 22 is excited by the power supply from the battery 30, and the brake 22 is released. For this reason, if there is an unbalanced load between the car 12 and the counterweight 18, the hoisting machine 17 is rotated by the unbalanced load, and the car 17 is raised or lowered. At this time, since the dynamic brake circuit 27 is connected to the power supply path 21 to the hoisting machine 17 as described above, the electromotive force generated from the motor due to the rotation of the hoisting machine 17 due to the uneven load is the dynamic brake. It flows through the resistor 26 of the circuit 27 and is consumed. For this reason, the rotation of the hoisting machine 17 is suppressed, and the rapid movement of the car 12 is prevented.

  Here, when the value of the resistor 26 of the dynamic brake circuit 27 is large, the braking force with respect to the motor of the hoisting machine 17 also becomes large. For this reason, when the unbalanced load by the car 12 and the counterweight 18 is small, the hoisting machine 17 does not rotate and the passenger in the car 12 remains in a confined state. The unbalanced load caused by the car 12 and the counterweight 18 varies depending on the number of passengers in the car 12, and there may be only a slight unbalanced load. It is preferable from the viewpoint of rescue of passengers that the hoisting machine 17 rotates and the car 12 moves even under such a slight uneven load.

  Therefore, in the initial state, the value of the resistor 26 of the dynamic brake circuit 27 is set low so that the hoisting machine 17 rotates even with a slight uneven load, and the car 12 is moved by the uneven load. When the car 12 moves due to an unbalanced load, the dynamic brake control unit 11C receives a detection signal from a rotation detector 29 provided in the hoisting machine 17 and monitors the rotation speed. When the speed exceeds a preset speed, the resistance value switching circuit 28 is controlled to increase the value of the resistance 26 of the dynamic brake circuit 27. Therefore, even when the unbalanced load is large, the rotation of the hoisting machine 17 can be effectively suppressed, so that the moving speed of the car does not become an overspeed state.

  Further, when the car 12 enters the landing zone with the nearest floor due to this movement, the landing zone detection means (not shown) formed between the inside of the hoistway 14 enters the landing zone. Is detected and notified by a notification means such as a buzzer. For this reason, the operation by the rescue operation switch 23 is canceled and the brake 22 is operated, so that the car 12 is landed on the nearest floor. Alternatively, the landing control may be automatically performed by operating the brake 22 by the brake control unit 11B based on a detection signal indicating that the vehicle has entered the landing zone. After landing, passengers are rescued by opening the door.

  Thus, by making the value of the resistor 26 of the dynamic brake circuit 27 variable according to the rotational speed of the hoisting machine 17, the car 12 can be moved even if the uneven load is small, and the uneven load is Even if the vehicle speed is large, the moving speed of the car 12 does not become an overspeed state, and a reliable and safe rescue operation can be performed.

  In the above-described embodiment, the resistance value switching circuit 28 switches the resistance value between two levels by one switch 28a. However, a plurality of switches may be provided to switch the value of the resistor 26 in multiple stages. By switching to multiple stages in this way, the moving speed control of the car 12 can be performed more smoothly.

  The release operation of the brake 22 is performed by turning on the rescue operation switch 23. However, even if the rescue operation switch 23 is kept on, the release of the brake 22 is intermittently performed at regular intervals by the timer circuit. You may do it. In this way, intermittently releasing the brake 22 maintains the braking force as compared with the case of continuously releasing the brake 22, so in a state where the unbalanced load is large and the moving speed of the car 12 tends to increase. Since the braking force by the dynamic brake can be assisted, the dynamic brake circuit 27 can have a margin.

  In the above embodiment, the rescue operation switch 23 is provided in the car 12, but other than the car, for example, in the management room or the operation control device 11 in the building 10 to provide an administrator from the outside. The car 12 may be moved by the operation of a person familiar with the rescue operation.

  Although several embodiments of the present invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 10 ... Building 11 ... Operation control apparatus 12 ... Ride car 14 ... Hoistway 17 ... Hoisting machine 18 ... Counterweight 21 ... Feeding path 22 ... Brake 23 ... Rescue operation switch 25A, 25B ... Switch 26 ... Resistance 27 ... Dynamic brake circuit 28 ... Resistance switching circuit

Claims (5)

An elevator device that wraps a rope that connects a car and a counterweight provided in a hoistway so as to be able to move up and down around the sheave of the hoisting machine, and raises and lowers the car by the rotation of the hoisting machine,
It has a switch that is turned on when power supply to the motor that drives the hoisting machine is cut off. A resistor is connected to the power supply path to the motor via this switch, and the electromotive force from this motor is consumed. A dynamic brake circuit,
Rescue provided in the car or outside the car, and the operation releases the brake of the hoisting machine that is activated when a power failure occurs and moves the car due to an unbalanced load with the counterweight An operation switch;
When the car is moved by this unbalanced load, the rotational speed of the hoisting machine is monitored, and when the rotational speed exceeds a preset speed, a resistance value switching circuit is used to increase the resistance value of the dynamic brake circuit. A dynamic brake control unit for controlling
An elevator apparatus comprising:   The elevator apparatus according to claim 1, wherein the brake release of the hoisting machine is intermittently performed every set time of the timer circuit.   A landing zone detecting means for detecting that the car has entered the landing zone of the nearest floor due to the movement of the car due to the unbalanced load, and a notifying means for notifying a detection result by the landing zone detecting means; The elevator apparatus according to claim 1, further comprising:   It has landing zone detection means for detecting that the car has entered the landing zone of the nearest floor due to movement of the car due to the unbalanced load, and the brake control means is based on the landing zone detection means. 3. The elevator apparatus according to claim 1, wherein the elevator apparatus has a function of operating the brake and landing the car on a nearest floor according to a detection result. 4.   5. An announcement means is provided for announcing in the car a rescue operation by releasing the brake when a confinement occurs in the car at the time of a power failure. The elevator apparatus as described in.

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