JP2788369B2 - Elevator speed monitoring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator speed monitoring device.

[0002]

2. Description of the Related Art As one of safety devices for elevators, there is a governor device that is legally required. It constantly monitors the elevator speed, 130% of rated speed
This is a device with a function to shut off the safety circuit and stop the elevator in an emergency. Also, the main rope is cut,
Due to mechanical factors, if the speed does not decrease just by shutting off the safety circuit, and if the speed further increases, there is also a function to stop the basket mechanically when it reaches 140% of the rated speed, This is for worst-case situations where the main rope breaks as described above. However, not only in such a worst case but also in the event of an emergency stop due to a speed of 130% of the rated speed due to some factor, a serious shock will be given to the passengers. To prevent this from happening,
Generally, various control monitoring circuits are provided to detect abnormalities before the operation of the governor device and to slow down the elevator and stop at the nearest floor so that passengers do not feel uncomfortable. Has been taken.

In particular, if the vehicle approaches the lowest floor and the highest floor (terminal floor) and is within a distance (deceleration distance) required for decelerating from the rated speed and stopping, unless the speed is equal to or lower than the rated speed, the vehicle passes the terminal floor. As a result, the vehicle stops outside the travelable range. In this case, a safety switch provided in the hoistway, which detects that the car has stopped outside the travelable range, operates to shut off a safety circuit in the control panel and put the elevator into a permanent stop state.
To return to normal from this state, an elevator service company inspector with specialized knowledge short-circuits the safety switch that detects out-of-travel range and manually drives it into the travel range. It was necessary to carry out dangerous work, such as returning to work. This return operation takes time, resulting in a decrease in the efficiency of service to passengers.

As a precautionary measure in such a case, a limit switch for detecting an elevator car position is provided at a certain distance from the terminal floor, and when this switch is operated, the elevator speed is equal to or less than a certain ratio of the rated speed. Otherwise,
A method of forcibly decelerating by outputting a deceleration command from the control panel to the motor has been adopted.

[0005]

However, the method of detecting the control abnormality by the combination of the operation of the distance detection switch from the terminal floor in the hoistway and the speed condition, the detection of the distance is mechanical and the swing of the car, etc. However, there is a problem that there is a possibility that accurate detection cannot be performed due to limitations due to mechanical factors.

[0006] It is therefore an object of the present invention, the speed of the elevator
From pulse generators and pulse generators that cause control abnormalities
Car speed and car position are calculated using
It is an object of the present invention to provide an elevator speed monitoring device capable of monitoring an abnormality of a pulse calculation means or a proximity switch at any position within a range where a car can normally travel, and performing a safe and reliable abnormality detection operation.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a pulse generator for generating a pulse signal synchronized with the travel of an elevator car, and a pulse generator based on the pulse signal from the pulse generator. Pulse calculating means for calculating the speed and position of the car, a switch provided on each floor for issuing an operation signal when the car reaches a certain floor, a speed change during normal running between all floors, and a car A travel data storage unit that stores a position change and an operation signal timing of the switch, and a car speed, a car position, and an operation timing of the switch when the car is actually traveling are input and stored in the travel data storage unit. The pulse generator, the pulse calculation means or
An elevator speed monitoring device, comprising: a comparison judging means for judging an abnormality of the switch .

[0008]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a system configuration diagram of an elevator speed monitoring device according to one embodiment of the present invention.

In FIG. 1, an elevator car 1 is connected to a counterweight 3 via a wire rope 2,
Utilizing the frictional force between the sheave 5 of the hoisting machine 4 and the wire rope 2, the sheave 5 is rotated by the rotational force of the motor 6 to move up and down. A safety switch 7 is provided near the lowermost floor and the uppermost floor of the hoistway to detect the entry of the car out of the operable range of the car and to emergency stop the elevator.
Also, it is provided near the bottom floor and the top floor of the hoistway,
Limit switch 8 for detecting abnormal speed of the car and forcibly decelerating it, and control panel 9 for controlling the operation of the elevator
A pulse generator 10 attached to the shaft of the motor 6 for generating a pulse proportional to the rotation direction and number of the motor 6, a detection plate 11 provided on the hoistway for detecting the position of the car, The provided proximity switch 12 is provided. The control panel 9 is provided with an arithmetic circuit 13 for calculating the running distance and speed from the cumulative frequency and number of pulses from the pulse generator 10 and for inputting the operation signal of the proximity switch 12 and checking the consistency. I have. FIG. 2 is a block diagram of the arithmetic circuit 13.

The arithmetic circuit 13 receives a pulse signal from the pulse generator 10 and calculates a speed of the car and a pulse count value (car position), and a normal operation during all floor-to-floor operations. The state, that is, the speed change and pulse count value of all travel types and the travel data storage unit 15 that stores the operation timing of the proximity switch 12 as travel pattern data, and the current car speed, pulse count value and proximity switch 12 A comparison unit 16 for inputting data corresponding to the current traveling pattern stored in the traveling data storage unit 15 and comparing and calculating a deviation to check the consistency, and a car call or Based on a driving command determined by a control device (not shown) that controls the operation of the elevator based on the landing call, the data of the next driving pattern is compared. The command to output to the section 16 is output to the traveling data storage section 15, and the result of the consistency judgment from the comparing section 16 is input. If there is any abnormality, the command to stop the elevator at the nearest floor is operated by the elevator. A pulse control unit 17 for converting a pulse signal into speed data, and a counting unit for counting pulses of the pulse signal. It consists of nineteen. 3 to 6 show waveforms of the speed and the count value processed by the pulse from the pulse generator 10 attached to the shaft of the motor 6. FIG.

Normally, the pulse signal from the pulse generator 10 is
As shown in FIGS. 3 (a) and 3 (b), they are input as a paired and two-phase waveform. … (A), (A). The traveling direction can be obtained by detecting the direction of rotation based on the difference between the phases of the two-phase waveforms (a) and (b) as shown in FIG. 3 and counting the speed based on the frequency. At this time, FIGS. 4 and 5 show waveforms of the result calculated by the pulse calculation unit 14, and FIG. 4 shows a waveform when the car is raised.
Shows the waveform when the car descends. Here, a waveform A represents a speed waveform during traveling, and a waveform B represents a change in the pulse count value. FIG. 6 shows the operation of the operation signal from the proximity switch 12, but this waveform must be the same if the traveling floor is the same. Next, the operation of the arithmetic circuit 13 will be described with reference to FIGS.

First, FIG. 7 shows the structure of a hoistway as an embodiment.
Show. Number of floors to stop, elevator speed 60m / min, acceleration / deceleration
0.5m / sec^Two , 1-2 floor height 3m, 2-3 floor height 2.5
m, 3-4 floor height 3.5m, 4-5 floor height 3m, 5-6 floor height 2.
5 m, 1 pulse per 5 mm, 6 from the first floor
The traveling pattern when traveling to the floor is shown in FIG.

When passing the 2-5 floor, 60 m / min, that is, 1
m / sec, the operation timing of the proximity switch 12 becomes a value obtained by dividing the height of each floor by the speed, and 2.5 m / 1 for the 2-3 floor.
m / sec = 2.5 sec. It can be calculated in the same way when passing through the 3-5th floor. At this time, the speed is constant at 1 m / sec, and the pulse count number increases at a constant gradient.

Further, the vehicle is accelerating up to the second floor, and assuming that the acceleration is constant from the start, the traveling pattern up to the second floor in FIG. 8 is obtained. Similarly, since the vehicle is decelerating to the 5th to 6th floors, it can be represented by the pattern after passing through the 5th floor in FIG.

Therefore, the comparison unit 16 sequentially stores the current speed,
The pulse count value and the operation signal of the proximity switch 12 are sent. The comparing unit 16 sequentially compares the transmitted real-time data with the data transmitted from the traveling data storage unit 15, determines whether there is any abnormality based on the operation result, and simultaneously determines the abnormal part. I do.

For example, if the operation and the speed of the proximity switch match, and the pulse count value does not match, the pulse generator 10 and the proximity switch 12 will be required because the speed is also obtained by converting the frequency of the pulse. No abnormality is found, and it can be determined that the counting unit 19 has an abnormality. Similarly, abnormal combinations as shown in Table 1 can be made, and each can be judged.

[0017]

[Table 1]

As shown in Table 1 above, when an abnormal part can be determined from the contents of the abnormality, the data of the abnormal part is sent to the main controller 17 and a deceleration command is output. The unit 17 outputs a nearest floor stop signal to a control device (not shown) that controls the operation of the elevator, and stops the car 1 to the nearest floor. At this time, the main control unit 17 simultaneously stores the error code corresponding to the abnormal location, and notifies the inspector who has performed the failure investigation with a display (not shown) or the like, so that the failure can be efficiently dealt with. To do.

FIG. 9 is a diagram showing an example of a traveling pattern at the time of service between floors. In actual running, if the acceleration changes in a straight line, the riding comfort is not good. Therefore, the acceleration is generally rounded, which also changes depending on the elevator adjuster. For this reason, it is necessary to store the correct running pattern data in the running data storage unit 15 when the respective floors are actually run after the adjustment is completed.

[0020]

According to the present invention, the speed control of an elevator
Pulse generators that cause abnormalities
Calculate the speed and position of the car based on the
It is possible to provide an elevator speed monitoring device capable of monitoring an abnormality of the loose calculation means or the proximity switch at any position within a range where the car can normally travel, and performing a safe and reliable abnormality detection operation.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of an elevator speed monitoring device of the present invention.

FIG. 2 is a block diagram of an arithmetic circuit according to the present invention.

FIG. 3 is a waveform diagram of a pulse signal of the pulse generator of the present invention.

FIG. 4 is an output waveform diagram of a pulse calculation unit of the present invention.

FIG. 5 is an output waveform diagram of a pulse calculation unit of the present invention.

FIG. 6 is an operation timing chart of the proximity switch of the present invention.

FIG. 7 is an explanatory diagram of the operation of the arithmetic circuit of the present invention.

FIG. 8 is an operation explanatory diagram of the arithmetic circuit of the present invention.

FIG. 9 is a diagram illustrating the operation of the arithmetic circuit according to the present invention.

[Explanation of symbols]

1 ... Cage, 10 ... Pulse generator, 12 ... Proximity switch, 14 ...
Pulse calculation unit, 15: running data storage unit, 16: comparison unit.

Continuation of the front page (51) Int.Cl. ⁶ identification code FI B66B 5/02 B66B 5/02 V (58) Investigation field (Int.Cl. ⁶ , DB name) B66B 5/06 B66B 1/36 B66B 3 / 00 B66B 3/02 B66B 5/02

Claims (1)

(57) [Claims] 1. A pulse generator for generating a pulse signal synchronized with the traveling of an elevator car, a pulse calculating means for calculating a car speed and a car position based on a pulse signal from the pulse generator, A switch that issues an operation signal when the car reaches a certain floor, a speed change during normal running between all floors, a car position change, and a running data storage unit that stores an operation signal timing of the switch, The car speed, the car position, and the operation timing of the switch when the car is actually traveling are input and compared with the traveling data stored in the traveling data storage unit, and the previous operation is performed .
The pulse generator, the pulse calculation means or the switch.
A speed monitoring apparatus for an elevator, comprising: a comparison judging means for judging an abnormality of a switch .