JPS6126305Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention detects the position digitally, and when controlling the elevator according to the detected position, the operation is restored to normal after recovery from an abnormal condition such as a power outage. This invention relates to an elevator control device that makes it possible to.

It is well known that conventional elevator operations are controlled based on scale models of the hoistway and the car, which is a moving object. In other words, since a type of tracing control operation is performed using an analog scale model, there are significant restrictions on the scale of the model in terms of accuracy and processing technology. As scale models have become larger, their production and installation have become problematic. In conjunction with this situation, advances in electronic components have led to attempts to control elevators using logical calculation methods based on digital position information.

In an elevator controlled using the digital logic operation method described above, the detected position signal indicates the position of the car and the distance traveled. Generally, in an elevator control system, when an abnormal condition such as a power outage occurs and the control function deteriorates or is lost, an emergency stop occurs for safety reasons, and a mechanical brake is used to stop the car from moving. stop. However, even if the brake is operated, it is impossible for the hoist and the car to stop instantaneously due to their inertia, and they continue to move until the brake force overcomes the inertia and then stop. Under such conditions, it is important to know where on the hoistway the car is stopped.

When a conventional elevator control device stops in such a state, as a means of returning to normal operation after the abnormal situation has been avoided, the stopping position of the car is unknown. The machine is moved in a predetermined direction by a signal from a special position detector installed in the hoistway.
Either the car is stopped at a specific floor and then returned to normal operation, or the car is manually moved to the nearest floor by visual inspection, the car is stopped, and then normal operation is resumed. There is.

Further, even in elevators that are controlled by digital position signals that do not use a scale model, it is necessary to take the above-mentioned normal operation recovery means.

The details of this invention will be explained below with reference to the illustrated embodiments. In the figure, reference numeral 1 denotes an elevator car, which is supported by a hoisting rope 4 wrapped around a pull sheave 3 provided on the shaft of a drive motor 2. 5 is a counterweight, which is connected to the other end of the rope 4. 6 is a loop-shaped speed governor rope connected to the top of car 1, and the speed governor sheave 7 is placed above the highest operating point of car 1 in the hoistway, and the pulley is placed at the bottom of the hoistway. It is wrapped around 8. 9 is provided on the shaft of the governor sheave 7 and is connected to the cage 1.
10 is a management control unit that calculates the amount of movement of car 1 in response to calls within the car and at the landing; 11 is a pulse generator that generates pulses according to the amount of movement of car 1 from pulse generator 9; The management control unit 1 receives the corresponding pulse signal as the movement amount of the car 1.
A logic operation section 12 has a function of controlling the speed by performing arithmetic operations and comparison operations with the movement amount given by 0, and a logic operation section 12 converts the moving speed signal of car 1 given from this logic operation section 11 into an analog quantity. The converting digital-to-analog conversion section 13 is a drive motor control section that receives a speed signal converted into an analog quantity in this digital-to-analog conversion section 12 and controls the drive motor 2 thereby, and rotates the drive motor 2. The car 1 is moved up and down via the index sheave 3 and rope 4.
As the car 1 moves, the governor sheave 7 is rotated by the governor rope 6 connected thereto, and the pulse generator 9 is driven. generate a number. The amount of movement per pulse unit may be arbitrary, but it is better to make it as small as possible in order to improve calculation accuracy.

In the above configuration, elevator operation is maintained normally unless an abnormality such as a power outage occurs, but once a power outage occurs, the contents of the pulse generator 9, management control unit 10, and logic operation unit 11 become unclear. Therefore, considering the coasting of the car after a power outage, it becomes impossible to determine the stopping position of the car 1 in the hoistway. However, according to the present invention, since the storage device 14 and the power supply device 15 are provided,
It is possible to simplify the treatment after the power is restored. Since the power supply device 15 only needs to supply power to the storage device 14 and the pulse generator 9, it may be a small-capacity storage battery or a generator capable of supplying power only until the car 1 completely stops after a power outage.

The storage device 14 cumulatively stores the pulses from the pulse generator 9, that is, stores where the car 1 is located with respect to the lowest point or the highest point of the hoistway. If the power supply by the power supply device 15 is cut off after a certain period of time, it is necessary to have something that can permanently store it, and if the power supply continues during the power outage period, it needs to have something that can store it temporarily. That's fine.

In short, according to the elevator control device according to this invention, by storing the movement amount of the car after a power outage, that is, the pulse signal of the pulse generator 9 in the storage device 14, the car 1 can be accurately stopped in the hoistway. You can know the location. Therefore, after the power is restored, it is easy to determine the amount of movement of the car 1 by calculating the storage contents of the storage device 14 and the amount of movement given by the management control section 10 in the logic operation section 11.

That is, the elevator can resume normal operation in response to a call at the same time as the power is restored. Of course, although not shown, by also storing the call state immediately before the power outage, it is possible to automatically return to the operating state immediately before the power outage immediately after the power outage is restored.

As described above, this invention provides a storage device that stores the amount of inertial movement of the elevator car after a power outage, and also supplies power to the storage device and pulse generator from the uninterruptible auxiliary power supply during the power outage. Therefore, the car position after a power outage can be reliably memorized, and operation can be easily resumed after the power outage is restored.

Furthermore, this idea supplies power only to the pulse generator and storage device until the car stops due to a power outage, so the capacity of the auxiliary power supply can be reduced, which eliminates the need for a large-scale auxiliary power supply. This is unnecessary and can be made inexpensive.

[Brief explanation of the drawing]

The figure is a block diagram of an elevator control system showing one embodiment of this invention. In the figure, 1...Elevator car, 2...Drive motor, 9...Pulse generator, 10...Management control section, 11...Logic operation section, 12...Digital-to-analog conversion section, 13...Drive motor control unit, 14
... Storage device, 15 ... Power supply device.

Claims (1)

[Scope of utility model registration request] A pulse generator that generates pulse signals according to the amount of movement of the elevator car as it moves, a management control unit that calculates the amount that the car should move in response to calls inside the car and in the hall, and pulses from the pulse generator. and a logic operation unit that generates a control signal for the elevator car based on the amount of movement command from the management control unit and the amount of movement of the elevator car from the pulse generator, after the power supply for driving the elevator car is in a power outage state. a storage device that stores the pulse signals of the pulse generator, and an uninterruptible auxiliary power supply that supplies power only to the pulse generator and the storage device in the power outage state until the car completely stops after the power outage. Elevator control equipment.