JPH02310284A - Abnormality detecting method for elevator door - Google Patents

Abstract

PURPOSE:To easily confirm any abnormal part by open-close actuating a door with a motor, which is controlled by an inspection speed command at a low speed, and obtaining at this time the deviation between a motor speed and the inspection speed command so as to judge the door in abnormality when a difference between this speed deviation and the reference deviation is not within the specified value. CONSTITUTION:A mode is placed in an inspection mode, and by an inspection speed command VP of low speed with fixed torque stored in a ROM232, a motor 1 is rotated to open-or close-actuate a door. When the motor 1 is rotated, a pulse is generated in accordance with rotation of the motor 1 from a pulse encoder 22 and measured by a pulse counter unit 235, while a motor speed VT is calculated by a CPU231. While a position of the door is calculated from a counting content of the counter unit 235. Thereafter, a speed deviation epsilonbetween a speed command UP and the motor speed VT is calculated, next by successively reading a reference deviation value epsilon0 stored in the ROM232 matching with a movement of the door, the value epsilon0 is compared with the above described speed deviation epsilon, when a relation is epsilon>epsilon0, abnormality is judged and displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for detecting an abnormality in an elevator door.

[Prior Art] First, the general configuration of an elevator door device will be described with reference to FIG.

In FIG. 4, 1 is a door drive motor, 2 is a deceleration mechanism, and the deceleration mechanism 2 and the drive motor 1 are connected by a drive belt 3. Reference numeral 4 indicates a door opening/closing belt wound between a driving pulley 5 and a driven pulley 6 attached to the output shaft of the speed reduction mechanism 2. Reference numeral 7 indicates a single-opening elevator door, and this door 7 is moved horizontally to the door hanger case. The hanger plate 8 is supported in a suspended state by a hanger plate 8 that can be supported, and the hanger plate 8 is connected to the heald 3 . 9 is a threshold, and the lower end of the door 7 is engaged with this threshold 9 via legs 10.

Further, 11 is a metal fitting for holding the door 7 fully closed, 12 is a locking member that locks on the metal fitting 11 when the door 7 is fully closed, 13 is a metal fitting for holding the door 7 fully open, and 14 is a metal fitting 13 for holding the door 7 fully open. It is a locking member that locks. Further, 15 is a door control box.

In the elevator door device configured as above,
When the drive motor 1 is rotated forward or backward, the rotation is transmitted to the speed reduction mechanism 2 via the drive belt 3, and the rotation decelerated by the speed reduction mechanism 2 is converted into horizontal linear motion by the belt 4. Ru. When the belt 4 runs horizontally, the door 7 moves and opens or closes the door. In FIG. 4, the solid line shows the state when the door is fully closed, and the broken line shows the state when the door is fully opened.

Further, when the door 7 is fully closed, the locking member 12 locks on the metal fitting 11, and when the door 7 is fully opened, the locking member 14 locks on the metal fitting 1.
Lock at 3. This maintains the door 7 in a fully closed or fully open state, prevents the door 7 from moving easily, and ensures safety when there is no force to open or close the door.

In such a door device, if the door opening/closing force is increased more than necessary, it may cause safety problems such as injuries to passengers when they come into contact with the door when the door is closed. It is limited to a certain amount of force. Moreover, if the holding force for holding the door 7 in the fully closed position and the fully open position is made too large, it will adversely affect the normal opening and closing of the door, and if it is made too small, the original function will be impaired.

Furthermore, even during normal door opening and closing, if the door 7 is deformed or the door 7 is improperly hung, the door opening/closing force will be suppressed.
Problems arise with the operability of the door.

In other words, the door cannot be opened and closed smoothly.

Therefore, it is necessary to measure the load when the door opens and closes, and adjust the dimensions of each problematic part based on the measurement results. However, when installing or maintaining an elevator after it has been shipped from the factory, the above adjustments cannot be made, so it is possible to set the dimensions of each part to arbitrary values and adjust the dimensions of each part on site. We try to manage mechanical loads.

However, such an adjustment method is difficult and time-consuming, and there are problems in that it cannot be adequately controlled due to variations in mechanical parts.

Conventionally, as a method for detecting an abnormality when an abnormality occurs in the door opening/closing operation due to deformation of the door, improper hanging of the door, etc., a method disclosed in Japanese Patent Publication No. 61-50877, for example, is known.

This abnormality detection method uses a current detector to detect the current flowing through the drive motor during door opening/closing, samples this current value at a certain frequency, and writes the sampling result to memory. The motor current value is compared with the current value stored in the memory, and it is determined whether or not there is an abnormality in the door opening/closing operation based on whether the difference between these values is within a specified value.

[Problems to be Solved by the Invention] However, the conventional elevator door abnormality detection method as described above is performed under normal door opening/closing operations, so the door moves quickly during normal door opening/closing, and Due to the inertial force, it is difficult to accurately grasp the mechanical load on the door during the door opening/closing process, and it is also difficult to determine abnormalities.

This invention was made in order to solve the above-mentioned problems, and it is possible to easily and accurately grasp the mechanical load situation of the door during the door opening/closing process, and to easily check abnormalities of the elevator door. The purpose is to provide an anomaly detection method.

[Means for Solving the Problem] The elevator door abnormality detection method according to the present invention opens and closes the elevator door by a motor controlled by a low-speed inspection speed command, and Find the deviation between the changing motor speed and the speed command for inspection, compare this speed deviation with a standard deviation stored in memory in advance, and if the difference in the comparison result is not within the specified value, an abnormality is detected with the door. It is determined that there is.

[Function 1] When the motor is rotated in response to the inspection speed command and the door is opened/closed, the motor speed changes depending on the mechanical load at the position where the door has moved. The speed deviation obtained from the difference between this motor speed and the speed command for inspection is compared with a reference deviation to determine whether the value of the difference is within a specified value. When the value is outside the specified value, it is determined that there is an abnormality in the door, and when it is within the specified value, it is determined that the door is normal.

Therefore, in the present invention, since the door is opened and closed at a low speed based on the low speed inspection speed command, the mechanical load situation on the door can be easily and accurately grasped, and abnormalities on the door can be easily confirmed.

[Example] Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is an overall configuration diagram showing an example of an elevator door control device to which the abnormality detection method of the present invention is applied.

In the figure, a drive motor 1 opens and closes the door in the same way as in Figure 4.
is connected to a power source 21 via a power circuit 20 that controls power to it. A pulse encoder 22 that generates pulses according to the rotation of the drive motor 1 is directly connected to the drive motor 1 . 23 is a door control circuit equipped with a door inspection function, and is composed of a microcomputer. That is, a CPU (central processing unit) 231 that controls the whole. ROM 232 for storing speed command data for normal door opening/closing, speed command data for inspection, etc. A RAM 233 and an input/output port 234 for storing calculation results from the CPU 231 and other data. and a pulse counter unit 235 that counts pulses from the pulse encoder 22 to detect the position of the door, and these are connected to the CPU 231 via a bus 236.

The input/output port 234 is connected to a position switch 24 that detects the fully closed position and fully open position of the door, and an elevator control panel 25. The elevator control panel issues commands to the input/output boat 234 to open and close the door.

Door inspection mode commands, etc. are output. Further, a PWM (pulse width modulation) unit 26 is connected to the bus 236 via an interface 237 . The PWM unit 26 sends out a pulse width modulated signal based on a PWM command calculated based on the speed pattern of the ROM 232 and the speed signal from the pulse counter unit 235, and this signal is converted into a gate signal by the gate signal generation circuit 27. is converted into power circuit 2
It is set to be output as 0. 28 is an inspection result display means connected to the bus 236 via an interface 238. A current detector 29 detects the current flowing through the drive motor 1 during door opening/closing operations, and this current detector 29 is connected to the lotus 236 via an A-D converter 30 and an interface 239.

Next, the operation of this embodiment configured as described above will be explained with reference to FIGS. 2 and 3.

FIG. 2 is a flowchart showing the procedure of door opening/closing operations in this embodiment, and FIG. 3 is a waveform diagram for explaining the operation at the time of inspection.

In FIG. 2, when the power is turned on, the door control circuit shown in FIG. 1 is initialized (step SL).

In the next step S2, it is determined whether the door control circuit is in the inspection mode. If it is not the inspection mode, the process advances to step S3 and a normal door opening/closing routine is executed.

That is, when a door open or door close command is sent from the elevator control panel 25, this command is sent to the C through the input/output mode 234.
At the same time as being taken into the PU231, the RO is
A speed pattern for opening or closing the door is read from M232. Along with this, the CPU 231 outputs a PWM command according to the speed pattern to the PWM unit 26. and,
The pulse width modulation signal output from the PWM unit 26 is converted into a gate signal by the gate signal generation circuit 27,
By applying this gate signal to the power circuit 20, the power supplied to the drive motor 1 is controlled, the motor 1 is rotated according to the speed pattern, and the door is opened or closed.

Furthermore, when the motor 1 rotates, the pulse encoder 22 operates to generate pulses corresponding to the rotation of the motor 1, which are output to the pulse counter unit 235. The pulse counter unit 235 scans pulses l-L, and its count value is taken into the CPU 231 at a predetermined calculation cycle. The actual motor speed taken into the CPU 231 and the speed command value are compared and calculated, and the calculation result is output as an actual speed command to the PWM unit 26, and the speed of the motor l is controlled according to the speed pattern. Further, when the door reaches the fully open or fully closed position, the position switch 24 is activated and outputs a fully open position signal or a fully closed position signal, and when this signal is taken into the CPU 231 through the input/output port 234,
Motor 1 stops.

Further, in step S2 of FIG. 2, if it is determined that the door control circuit is in the inspection mode, that is, the elevator control panel 25 is switched to the inspection mode during maintenance and inspection of the elevator, then step S4
Then, the speed command for inspection (■) stored in the ROM 232 is read out.

This speed command (2) is a low speed command with a constant torque as shown in FIG. 3(a).

When a speed command V for inspection is generated, this command causes
PWM unit 26. The motor 1 is rotated by controlling the power circuit 20 via the gate signal generation circuit 27,
Open or close the door.

When the motor 1 rotates, the pulse encoder 22 operates, and the pulse encoder 22 generates pulses corresponding to the rotation of the motor 1. These pulses are counted by the pulse counter unit 235, and the counted value is set to a predetermined value. Imported into the CPU 231 at the calculation cycle (step S5
). Then, in the next step S6, the motor speed ■
Calculate 7.

Furthermore, in the next step S7, the position of the door is calculated from the count contents of the pulse counter unit 235.

After that, the process moves to step S8, and the speed command (■) is issued.

and the motor speed V, the speed deviation (V, -Va) = ε is calculated.

In the next step S9, the standard deviation value ε is stored in the ROM 232 in advance. is sequentially read out in accordance with the movement of the door, and in the next step SIO, it is determined whether or not there is an abnormality by comparing it with the deviation value ε based on the detected speed sequentially calculated according to the position of the door.

That is, the deviation value ε due to the detected speed is the standard deviation value ε.

If it is larger than that, it is determined that there is an abnormality and the process proceeds to step Sll.
The inspection results are displayed on the display means 28.

Also, the deviation value ε is the standard deviation value ε. It is determined to be normal when it is equal to or smaller than.

Next, a specific example of whether the installation and maintenance status of the door is normal or abnormal will be explained with reference to FIG.

First, a case will be described in which the installation and maintenance conditions of the door are normal.

As mentioned above, when the door is fully opened/closed, the mechanical load caused by the door opening/closing force due to the engagement and disengagement of the metal fittings and the locking member, the distortion of the door, the gap between the sill and the door legs, etc., as shown in Figure 3. A mechanical load as shown by curve 40a in FIG. 4B occurs. Therefore,
When the door under such a load condition is fully opened and closed by the motor 1 controlled by the speed command Va shown in Fig. 3(a), C
Motor detection speed v obtained from the calculation result of PU231
P becomes as shown by the curve 41a in FIG. 3(C). Further, the speed deviation value ε between the detected motor speed (2) and the speed command Va becomes a curve 42a in FIG. 3(d).

Then, the deviation standard value ε is determined in advance through an evaluation test or the like.

(corresponding to the curve 42c in FIG. 3(d)) is stored in the ROM 232, and the detected speed deviation value ε and the reference deviation value ε are set in accordance with the movement of the door. Compare with. Here, the detected speed deviation value ε is the reference deviation value ε. If it is larger than , it is judged as abnormal. Therefore, when comparing the curve 42a and the curve 42C, the detected speed deviation value ε is the reference deviation value ε. Since it is smaller, it is judged that there is no abnormality.

Next, a case where the installation and maintenance conditions are abnormal will be described.

In this case as well, the motor 1 is rotated in accordance with the inspection speed command vi shown in FIG. 3(a) to open and close the door. The mechanical load associated with fully opening and closing the door at this time is curve 4 in Figure 3 G).
0b, which is larger than normal. Therefore, the rotational speed of the motor 1 decreases, and the detected speed V becomes as shown by the curve 41b in FIG. 3(C), and the speed command V.

The speed deviation value ε from the detected speed ■ is as shown by the curve 42b in FIG. 3(d).

Here, the speed deviation value ε and the standard deviation value ε. As shown in FIG. 3(d), the deviation value is larger than the standard deviation value when the door is fully opened, near the beginning of closing, and during constant running (center portion), and is determined to be abnormal. The result determined to be abnormal is displayed on the inspection result display means 28, and a request for readjustment is also displayed. In addition, since the readjustment request display uses a low speed command for inspection, it is possible to determine at a glance where the problem is between fully open and fully open the door, reducing readjustment work time. can do.

In this embodiment as described above, the torque is constant.

The door is opened and closed using a low-speed inspection speed command, and the deviation value ε between the motor speed and the speed command at this time and the standard deviation value ε are calculated.
. Since the door load is determined and displayed, it is possible to accurately grasp the mechanical load situation of the door, and to check abnormalities at a glance, so that the door can be re-installed. Adjustments can also be made easily.

In the above embodiment, a case has been described in which the abnormality determination is compared with the upper limit of the standard deviation, but the present invention is not limited to this, and a lower limit standard deviation may be provided and the upper and lower limits may be used for comparative determination. In this case, the accuracy of abnormality detection can be further improved.

Further, in the above embodiment, the speed deviation due to the detected speed was used as the object of abnormality determination, but the same can be done by using the current flowing through the morph.

[Effects of invention As described above, according to the present invention, the torque is constant.

Fully open/close the door using a low-speed inspection speed command, compare the speed deviation obtained from the motor speed and speed command at this time with a predetermined standard deviation, and if the speed deviation is not within the standard deviation value. Since the elevator door is configured to determine that there is an abnormality, the mechanical load situation on the door can be easily and accurately grasped, and the abnormality can be easily confirmed.

[Brief explanation of drawings]

Fig. 1 is an overall configuration diagram of a door control circuit to which the elevator door abnormality detection method according to the present invention is applied, Fig. 2 is a flowchart showing the operating procedure in this embodiment, and Fig. 3 (
a) to (d) are explanatory diagrams of operations during abnormality inspection, and FIG. 4 is a schematic diagram of the elevator door device. DESCRIPTION OF SYMBOLS 1... Drive motor, 7... Door, 20... Power circuit, 23...-Door control circuit, 25... Elevator control panel, 26... PWM unit, 27... Gate signal generation Circuit, 28...Display means. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] The elevator door is opened and closed by a motor controlled by a low-speed inspection speed command, and the deviation between the motor speed, which changes as the door operation progresses, and the inspection speed command is calculated, and this speed deviation is stored in memory in advance. A method for detecting an abnormality in an elevator door, comprising: comparing the difference between the comparison results and a standard deviation stored in the standard deviation, and determining that there is an abnormality in the door when the difference between the comparison results is not within a specified value.