JP5436421B2 - Elevator equipment - Google Patents

Description

  The present invention relates to an elevator apparatus capable of carrying out a rescue operation in which a car is moved to a landing floor by controlling a brake device when the car is stopped between floors due to a failure of the operation control device or a power failure.

  In a conventional elevator rescue operation device, the brake is released when the control device fails, and the car travels using an unbalance between the load on the car side and the load on the counterweight. At this time, the moving distance or speed of the car is detected, and the brake is braked based on the detection result (see, for example, Patent Document 1).

JP 2005-247512 A

  In the case of the conventional rescue operation device for failure as described above, when a failure occurs in the sensor for detecting the moving distance or speed or the arithmetic device for controlling the brake, the car is appropriately moved to the landing floor. The car could move to the end of the hoistway.

  The present invention has been made to solve the above problems, and can prevent the car from running away due to a malfunction of the brake control device during the rescue operation of the car, thereby improving the reliability. An object of the present invention is to obtain an elevator apparatus that can perform the above.

  An elevator apparatus according to the present invention includes a hoisting machine having a drive sheave, suspension means wound around the drive sheave, a car suspended by the suspension means and lifted and lowered by the hoisting machine, a counterweight, and a car traveling Rescue by controlling the brake device to be braked and the brake device, and when the car is stopped between the floors, the car is moved to the landing floor using the unbalance between the load on the car side and the load on the counterweight. A brake control device that performs driving is provided, the brake control device includes first and second calculation units that execute the same calculation processing for performing rescue operation independently of each other, and the first and second The computing unit detects a failure of the first and second computing units by comparing the computation results of each other.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows the elevator apparatus by Embodiment 1 of this invention. It is a circuit diagram which shows the brake device of FIG. 1, a brake control apparatus, and a brake electric power feeder. It is a circuit diagram which shows the brake device, brake control apparatus, and brake electric power feeder of the elevator apparatus by Embodiment 2 of this invention.

Preferred embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
1 is a block diagram showing an elevator apparatus according to Embodiment 1 of the present invention. In the figure, the car 1 and the counterweight 2 are suspended in the hoistway by the suspension means 3 and are raised and lowered in the hoistway by the driving force of the hoisting machine 4. As the suspension means 3, a plurality of ropes or a plurality of belts are used.

  The hoisting machine 4 includes a driving sheave 5 around which the suspension means 3 is wound, a hoisting motor 6 that rotates the driving sheave 5, and a brake device 7 that brakes the rotation of the driving sheave 5. The brake device 7 includes a brake drum 8 that is coaxially coupled to the drive sheave 5, a brake shoe 9 that is in contact with and separated from the brake drum 8, a brake spring that presses the brake shoe 9 against the brake drum 8 and applies a braking force, An electromagnetic magnet that releases the braking force by pulling the brake shoe 9 away from the brake drum 8 against the brake spring is provided.

  The hoisting machine motor 6 is provided with a hoisting machine encoder unit 10 that generates a signal corresponding to the rotational speed of the drive sheave 5 (a signal related to the speed of the car 1). The hoisting machine encoder unit 10 includes first and second hoisting machine encoders 10a and 10b (FIG. 2) as first and second speed detectors that generate independent detection signals.

  An upper hoistway switch 11 is provided near the upper terminal floor of the hoistway. A lower hoistway switch 12 is provided in the vicinity of the lower terminal floor of the hoistway. The hoistway switches 11 and 12 are used as position correction switches for detecting the absolute position of the car 1 and correcting the car position information. An operation cam 13 for operating the hoistway switches 11 and 12 is attached to the car 1.

  A car shock absorber 14 and a counterweight shock absorber 15 are installed at the bottom (pit) of the hoistway. The car shock absorber 14 is disposed directly below the car 1. The counterweight buffer 15 is disposed directly below the counterweight 2.

  A governor sheave 16 is provided in the upper part of the hoistway. A tension wheel 17 is provided at the lower part of the hoistway. A governor rope 18 is wound around the governor sheave 16 and the tension wheel 17. Both ends of the governor rope 18 are connected to the car 1. The governor rope 18 is circulated as the car 1 moves up and down. Thereby, the governor sheave 16 is rotated at a speed according to the traveling speed of the car 1.

  The governor sheave 16 is provided with a governor encoder unit 19 that generates a signal corresponding to the rotational speed of the governor sheave 16, that is, the speed of the car 1. The governor encoder unit 19 includes first and second governor encoders that generate independent detection signals.

  The brake device 7 is controlled by the brake control device 20. Signals from the hoisting machine encoder unit 10, the hoistway switches 11 and 12, and the governor encoder unit 19 are input to the brake control device 20. In addition, a signal corresponding to the current of the electromagnetic magnet of the brake device 7 is input to the brake control device 20.

  The brake control device 20 controls the braking force of the brake device 7 so that the deceleration of the car 1 does not become excessive when the car 1 is brought to an emergency stop.

  In addition, the brake control device 20 performs braking according to a command from the outside when the car 1 is stopped between floors due to a failure or power failure of an operation control device (not shown) that controls the operation of the car 1. A rescue operation is performed in which the car 7 is automatically moved to the landing floor by controlling the device 7. In the rescue operation of the car 1, the car 1 travels at a low speed to a predetermined landing floor (for example, the nearest floor) by utilizing an unbalance between the load on the car 1 side and the load on the counterweight 2.

  Electric power is supplied to the electromagnetic magnet of the brake device 7 by the brake power supply device 21. Supply of electric power to the brake device 7 by the brake power supply device 21 is controlled by the brake control device 20.

  FIG. 2 is a circuit diagram showing the brake device 7, the brake control device 20, and the brake power supply device 21 of FIG. The electromagnetic magnet of the brake device 7 is provided with first and second brake coils (electromagnetic coils) 22a and 22b.

  By passing a current through these brake coils 22 a and 22 b, the electromagnetic magnet is excited, an electromagnetic force for releasing the braking force of the brake device 7 is generated, and the brake shoe 9 is separated from the brake drum 8. In addition, by energizing the brake coils 22a and 22b, the excitation of the electromagnetic magnet is released, and the brake shoe 9 is pressed against the brake drum 8 by the spring force of the brake spring. Furthermore, the braking force of the brake device 7 is controlled by controlling voltage commands to the brake coils 22a and 22b.

  A circuit in which a first discharge resistor 23a and a first discharge diode 24a are connected in series is connected in parallel to the first brake coil 22a. A circuit in which a second discharge resistor 23b and a second discharge diode 24b are connected in series is connected in parallel to the second brake coil 22b.

  One end of the first brake coil 22a and one end of the second brake coil 22b are connected to a power source via first and second electromagnetic switches 25 and 26. The first and second electromagnetic switches 25 and 26 are connected in series. The other end of the first brake coil 22a is connected to the grounding part via the first brake coil control switch 27a. The other end of the second brake coil 22b is connected to the grounding part via the second brake coil control switch 27b.

  The first electromagnetic switch 25 is opened and closed by the first drive coil 28a. One end of the first drive coil 28a is connected to a power source. The other end of the first drive coil 28a is connected to the grounding part via the first electromagnetic switch control switch 29a.

  The second electromagnetic switch 26 is opened and closed by the second drive coil 28b. One end of the second drive coil 28b is connected to a power source. The other end of the second drive coil 28b is connected to the grounding part via the second electromagnetic switch control switch 29b. Semiconductor switches are used as the control switches 27a, 27b, 29a, and 29b, respectively.

  The brake control device 20 includes first and second calculation units 30a and 30b that execute the same calculation process for performing the rescue operation independently of each other. The first arithmetic unit 30a controls opening and closing of the first brake coil control switch 27a and the first electromagnetic switch control switch 29a. The second arithmetic unit 30b controls opening and closing of the second brake coil control switch 27b and the second electromagnetic switch control switch 29b.

  The first and second arithmetic units 30a and 30b are each constituted by a microcomputer. A two-port RAM 31 is connected between the first and second arithmetic units 30a and 30b. The first and second arithmetic units 30a and 30b have failed in at least one of the first and second arithmetic units 30a and 30b by comparing the calculation results of each other via the two-port RAM 31. Monitor whether or not.

  A signal from the first hoisting machine encoder 10a is input to the first arithmetic unit 30a. A signal from the second hoisting machine encoder 10b is input to the second arithmetic unit 30b. The first and second arithmetic units 30a and 30b compare each other's input signals via the two-port RAM 31, so that at least one of the first and second hoisting machine encoders 10a and 10b has failed. Monitor whether it has occurred.

  A rescue operation command device (brake release device) 32 that generates a rescue operation command is connected to the first and second arithmetic units 30a and 30b. The connection part of the rescue operation command device 32 is provided, for example, at a landing button device on a specific floor. When the rescue operation is performed, the maintenance button removes the cover of the landing button device, and the rescue operation command device 32 is connected to the exposed connection portion.

  The first and second arithmetic units 30a and 30b store similar programs for performing rescue operation. When a command to start the rescue operation is input by the rescue operation command device 32, the first and second arithmetic units 30a and 30b open the first and second brake coil control switches 27a and 27b, and the car 1 The car 1 is raised or lowered by imbalance between the load on the side and the load on the counterweight 2. However, when the load on the car 1 side and the load on the counterweight 2 are balanced, rescue is performed by manual operation separately.

  When the rescue operation is started, the first and second arithmetic units 30a and 30b calculate and monitor the speed of the car 1 based on the signals from the hoisting machine encoders 10a and 10b. Then, the first and second brake coil control switches 27a and 27b are controlled so that the speed of the car 1 does not exceed a preset speed (lower than the rated speed).

  That is, if the detected speed does not reach the target speed, the applied voltage signal transmitted to the brake coil control switches 27a and 27b is increased to reduce the braking force. When the detected speed reaches the target speed, the applied voltage signal transmitted to the brake coil control switches 27a and 27b is reduced to increase the braking force.

  Thereafter, when it is detected by the landing detection device (not shown) that the car 1 has moved to the landing position, the first and second arithmetic units 30a and 30b The control switches 27a and 27b and the first and second electromagnetic switch control switches 29a and 29b are opened, and the car 1 is stopped.

  During rescue operation, the difference between the signals from the first and second hoisting machine encoders 10a and 10b or the difference between the calculation results by the first and second arithmetic units 30a and 30b exceeds a preset threshold value. The first and second arithmetic units 30a and 30b determine that some failure has occurred, and open the first and second electromagnetic switch control switches 29a and 29b.

  When at least one of the first and second electromagnetic switch control switches 29a and 29b is opened, energization to the first and second brake coils 22a and 22b is cut off, and the car 1 is stopped. Rescue operation is forcibly stopped.

  The brake control device 20 and the brake power supply device 21 are provided with a battery (not shown), so that a rescue operation can be performed even during a power failure.

  In such an elevator apparatus, the brake control apparatus 20 is provided with first and second calculation units 30a and 30b that execute the same calculation process for performing the rescue operation independently of each other. Since the second calculation units 30a and 30b detect the failure of the first and second calculation units 30a and 30b by comparing the calculation results of each other, the malfunction of the brake control device 20 during the rescue operation of the car 1 Thus, the car 1 can be prevented from running out of control and the reliability can be improved.

  Moreover, since the 1st and 2nd calculating parts 30a and 30b implement rescue operation based on the signal from mutually different hoisting machine encoders 10a and 10b, the failure of hoisting machine encoders 10a and 10b is also detected. And the reliability can be further improved.

  Further, the first and second arithmetic units 30a and 30b compare the signals from the first and second hoisting machine encoders 10a and 10b with each other to thereby compare the first and second hoisting machine encoders 10a and 10b. Therefore, it is possible to distinguish between the failure of the arithmetic units 30a and 30b and the failure of the hoisting machine encoders 10a and 10b, and to smoothly recover from the failure.

  Furthermore, the first and second electromagnetic switches 25 and 26 are connected in series between the first and second brake coils 22a and 22b and the power source, and the first and second arithmetic units 30a and 30b are connected. Since the first and second electromagnetic switches 25 and 26 are opened when a failure is detected, the rescue operation can be stopped more reliably and promptly when a failure is detected.

Embodiment 2. FIG.
3 is a circuit diagram showing a brake device 7, a brake control device 20, and a brake power supply device 21 of an elevator apparatus according to Embodiment 2 of the present invention. In this example, the first and second electromagnetic switches 25 and 26 are connected in parallel to the power source. Accordingly, when the first electromagnetic switch 25 is opened, the energization to the first brake coil 22a is cut off, and when the second electromagnetic switch 26 is opened, the energization to the second brake coil 22b is performed. Is cut off. Other configurations are the same as those in the first embodiment.

  Even with such a circuit configuration, it is possible to prevent the car 1 from running out of control due to a malfunction of the brake control device 20 during the rescue operation of the car 1, and to improve the reliability.

In the first and second embodiments, the first and second hoisting machine encoders 10a and 10b are used as the first and second speed detectors. However, the present invention is not limited to this. First and second governor encoders may be used.
In the first and second embodiments, a double system configuration using the first and second arithmetic units 30a and 30b is used. However, a triple or more multiplexed system may be used.
Further, in the first and second embodiments, the brake device 7 that brakes the rotation of the drive sheave 5 and brakes the car 1 is shown. However, the present invention is not limited to this. A brake that brakes the car 1 (rope brake), a brake that is mounted on the car 1 and engages with a guide rail to brake the car 1 (car brake), or the like may be used.
Furthermore, the number of brakes is not limited to one, and a plurality of brakes may be used.
In the first and second embodiments, the car 1 is moved up and down by one hoisting machine 4, but an elevator apparatus using a plurality of hoisting machines may be used.

Claims (4)

Hoisting machine with drive sheave,
Suspension means wound around the drive sheave,
A car and a counterweight suspended by the suspension means and raised and lowered by the hoisting machine;
The brake device that brakes the traveling of the car, and the brake device is controlled, and when the car is stopped between floors, an unbalance between the load on the car side and the load on the counterweight is used. Equipped with a brake control device that performs rescue operation to move the car to the landing floor,
The brake control device includes first and second calculation units that execute the same calculation process for performing the rescue operation independently of each other,
The brake device has a brake coil that generates an electromagnetic force for releasing the braking force,
Between the brake coil and the power source, a first switch opened and closed by the first calculation unit and a second switch opened and closed by the second calculation unit are connected in series,
It said first and second calculating unit, by comparing the mutual operation result to detecting a failure of said first and second operational unit, at the time of failure detection, the first calculation unit in the first An elevator apparatus that opens a switch, and wherein the second calculation unit opens the second switch .   The elevator apparatus according to claim 1, wherein the first and second arithmetic units automatically stop the rescue operation when a failure is detected. First and second speed detectors for generating signals relating to the speed of the car independently of each other;
The first calculation unit controls the brake device based on a signal from the first speed detector during a rescue operation,
The elevator apparatus according to claim 1, wherein the second calculation unit controls the brake device based on a signal from the second speed detector during a rescue operation.   The said 1st and 2nd calculating part detects the failure of the said 1st and 2nd speed detector by comparing the signal from the said 1st and 2nd speed detector with each other. Elevator device.

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