JPS59227678A - Safety device for elevator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an elevator safety device that can detect an abnormality even if a car or a train stalls.

FIG. 1 is a block diagram showing the configuration of a conventional elevator. In the figure, 1 is a cage, 2 is a counterweight provided via a rope 3, 4 is a sheave, and 5 is an electric motor.

A pulse generator 6 is connected to the rotating shaft of the electric motor 50, and the pulse generator 6 generates pulses proportional to the rotational speed of the electric motor 5. The pulses generated by this pulse generator 6 are sent to the counter 7.
The microcomputer 8 reads the counted value and detects the current position of the car 1.

The pulse generator 6 is configured to generate one pulse every time the car 1 moves, for example, 10 steps. Therefore, the microcomputer 8
For example, read the value of counter 7 every 50 m IIe, add this read value to the current position of the car one cycle before when car 1 is going up, subtract it when car 1 is going down, and apply the calculation result to car 1's current position. Store as current position.

In this way, the microcomputer 8 controls the elevator according to the position of the car 1, including when the car is traveling and when it is landing on the floor.

Now, in an elevator configured as shown in Fig. 1, when the output torque of the motor 5 decreases due to a drop in the power supply voltage, or when the load in the car 1 becomes excessive, the motor 5 The rotation speed has become abnormally low.
By monitoring the number of pulses of the pulse generator 6 by the microcomputer 8, an abnormality can be detected.

However, if the emergency stop (not shown) of the car 1 or the sheave 2 malfunctions, the lobe 3 and sheave 4 may Even if the microcomputer 8 monitors the slippage, the motor 50 rotation speed, or the number of pulses of the pulse generator 6, the abnormality cannot be detected.

In an elevator with the configuration shown in Figure 1, one car or nine
There was a problem where stalls in Aiomoshi 2 could not be checked.

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional technology, and even if the emergency stop of the car or stationary weight malfunctions and the car or stationary line stalls, The purpose of the present invention is to provide an elevator safety device that can detect such abnormalities.

Embodiments of the elevator safety device of the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram showing the configuration of a microcomputer applied to one embodiment of the present invention.The configuration of the parts other than the microcomputer 8 is the same as that of the conventional example shown in FIG. This will be explained using them together.

In the microcomputer 8 in FIG. 2, 81 is an input capo that receives the output of the counter 7 in FIG.
pU, 84 represents a read-only memory ROM containing programs to be executed by the CPU 83, fixed data stored in advance, etc., and 85 represents a read/write memory RAM for storing various data.

Figure 3 shows the contents of the microcomputer 8 (D ROM84).
It is a flowchart diagram showing the execution of a program stored in advance in the
) is executed only once.

In step 31, read the value of counter 7, and read/write memo! Store the value in the DP address of J RAM85,
A reset signal is output to the counter 7, and the counter 7 is cleared.

Next, in step 32, the traveling direction of car 1 is identified, and DIR is set to 1 or - depending on whether it is ascending, descending, or otherwise.
Set to 1.0.

In step 32, if it is determined that the car 1 is ascending, it is set to DIR (HrlJ) in step 33 and proceeds to step A. If it is descending in step 32, the process moves from step 32 to step 37, in which it is descending. If so, DIR is set to "-1" in the step song, and if it is determined in step 37 that the vehicle is neither rising nor descending, DIR is set to "0" in step 39.

As described above, if car 1 is ascending, the process advances to step 34, and the current position FSY of car 1 is FSY=FSY.
Set to +DIRXDP.

Here, FSY indicates the current value of the car stored in the RAM 85 and calculated by the microcomputer 8. In this step 34, the current FSY is calculated based on the FSY of the microcomputer 8 one calculation cycle before.

In step A 36, FSY is compared with fixed data F8ZT and FSZB previously stored in the ROM 84, and if FSY≧F8ZT or FSY≦FSZB, an emergency stop command ESTOP f r I J is set.

Here, FSZT and FSZB are values set by converting to the running pulse of car 1 with the lowest floor as a reference, and FSZT is the position above the top floor, FSZ
B represents a position below the lowest floor, and represents a position that the car 1 cannot normally reach.

Now, a case will be described in which the car 1 or the mating weight 2 is prevented from running due to a malfunction such as an emergency stop, and the rope 3 continues to cling to the sheep 4.

Even at this time, the electric motor 5 continues to rotate, so the pulse generator 6 generates running pulses.

Therefore, since the flowchart in FIG. 3 is executed only once in each calculation period (for example, 50m5ec),
If this calculation is repeated tens to hundreds of times, the current position tF8Y of car 1 will continue to increase while ascending and decrease while descending.
Eventually, FSY≧FSZT or FSY≦FSZB, and in step 40, the emergency stop command ESTOP becomes "1", and the emergency stop command can be issued to the outside.

Furthermore, the present invention attempts to detect the stall of the car 1 or the train 2 by a program, which is different from a program that is executed by the microcomputer 8 and controls normal elevator running. It is sufficiently small, and can be easily realized by using the same microcomputer 8 and only slightly increasing the capacity of the ROM 84.

In other words, it can be said that it is an inexpensive device because it requires almost no additional hardware devices.

As described above, according to the elevator safety device of the present invention, the current position of the car is detected by a pulse generator that generates pulses proportional to the number of rotations of the electric motor, and the current position of the car is thereby detected. In an elevator that controls the movement and landing of sheep, even if the emergency stop of the car or mating weight malfunctions and the rope continues to touch the sheep, this will be detected and the emergency stop will be activated. Since a command is issued to stop the elevator, even if the car or the elevator stalls, the abnormality can be detected.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional elevator control device, FIG. 2 is a detailed diagram of the microcomputer II (D) in the elevator safety device of the present invention, and FIG. 3 is a detailed diagram of the elevator safety device 1 of the present invention.・Cage, 2... Matching weight, 3... Rope, 4... Sheep, 5... Electric motor, 6... Pulse generator, 7... Counter, 8... Microcomputer, 81...Input port, 82...Output port, 83...CPU. 84...ROM, 85...RAM 0The same reference numerals in the drawings indicate the same or equivalent parts. Person Masuo Oiwa (2 others) t 1 Figure JP-A-59-227678 (4) t a Figure

Claims (1)

[Claims] In an elevator, the current position of the car is detected by pulses generated as the car moves from a pulse generator connected to an electric motor that drives the elevator car, and the movement of the elevator is controlled thereby. An elevator safety device characterized by comprising a microcomputer that detects an abnormal state when υ is larger than the first predetermined value or when any of the above current positions is smaller than the second predetermined value. .