JPH06115846A - Abnormality detecting device for elevator - Google Patents

Abstract

PURPOSE:To realize reliable decision of the occurrence of abnormality by deciding that abnormality occurs to a load detector when a difference between the value of a load signal and the value of a preceding load signal exceeds a given value in case a car door is in a closed state, in detection of an overload state in a car from the output of a load detector. CONSTITUTION:A load detector (a differential transformer) 5 to detect a load being a load in an elevator car 4 is provided. After an output signal therefrom is ADD-converted at 8e through a moving cable 7 by means of a CPU 8a of an arithmetic controller 8, the digital signal is inputted as a metered value VX. In the CPU 8a, when it is detected that the door of an elevator is in a closed state the metered value VX is compared with a metered value VF determined at a preceding computing period to effect decision of ¦VX-VF¦>=VS, wherein VS is a given value based on which the occurrence of abnormality is decided. When a decision result is NO, it is decided that the load detector 5 is normal, and when it is YES, it is decided that abnormality occurs. Further, in this case, in case an elevator is not in a closed state, above decision is not carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator abnormality detecting device, and more particularly to an elevator abnormality detecting device for detecting an abnormality of a load detector for detecting the weight of an elevator car.

[0002]

2. Description of the Related Art A technique disclosed in Japanese Patent Application Laid-Open No. 3-162374 can be cited as one related to this type of conventional elevator abnormality detecting device. This will be described with reference to FIGS. 3 to 6.

FIG. 3 is a hardware configuration diagram showing an elevator control system. In the figure, 1 is a sheave driving an elevator, 2 is a sheave, and 3 is a sheave 1 and a sheave 2.
The rope 4 wound around the rope, 4 is an elevator car that is suspended at one end of the rope 3 and moves up and down by the rotation of the sheave 1, 5 is a load detector that detects the load that is the load in the elevator car 4, and 6 is the rope A counterweight, which is a counterweight suspended at the other end of 3, a moving cable 7 that can move in accordance with the elevation of the elevator car 4, 8 is an arithmetic controller arranged in a machine room, and a CPU (Central processing unit)
8a, a ROM 8b that is a read-only memory, a RAM 8c that is a readable / writable memory, a bus 8d that is a passage for various information, and an analog / digital converter 8e that performs signal conversion between analog signals and digital signals. ing. Reference numeral 9 is an electric motor for driving the hoisting machine.

In the elevator of this construction, the total weight of the elevator car 4 (self-weight + load in the car) is the load detector 5
Is measured as an analog amount by the moving cable 7 and input to the arithmetic and control unit 8, and the analog / digital converter 8e converts the analog amount into a digital amount.
Read by U8a. Then, after various arithmetic processing is performed, a predetermined signal corresponding to the arithmetic result is output to various drive units of the elevator via an output circuit (not shown). A predetermined program is stored in the ROM 8b of the arithmetic and control unit 8, and is read and executed by the CPU 8a at any time. In addition, the RAM 8c stores information about each elevator and CP.
The calculation result in U8a is also temporarily stored.

The load detector 5 will be described below.
FIG. 4 is a configuration diagram showing a load detector of the elevator. In the figure, 3a is a shackle connected to the tip of the rope 3, and the rope 3 is connected to an elevator car 4 by using this shackle 3a. 3b is a shackle spring that contracts in proportion to the total weight of the elevator car 4 (self-weight + load in the car), 4a is an upper beam arranged above the elevator car 4, and 5a is proportional to the amount of contraction of the shackle spring 3b. The upper beam 4a has a shackle spring 3b and a differential transformer 5a built therein.

FIG. 5 is a characteristic diagram showing the relationship between the load in the elevator car and the measured value of the differential transformer. As described above, even if the load inside the car is 0%, the weight value VX of the differential transformer 5a produces an output V0 in order to calculate the own weight.

Next, the operation of the conventional elevator abnormality detection device will be described. FIG. 6 is a flowchart showing an abnormality detection program for a conventional elevator abnormality detection device. This program is stored in the ROM 8b of the arithmetic controller 8, and the CPU 8a repeatedly calculates this program. In the figure, first, in step S1, the measured value VX of the differential transformer 5a is read into the CPU 8a via the analog / digital converter 8e. Next, in step S2, it is determined whether or not the measured value VX is within the range of V0 to V0L. That is, it is determined that V0≤VX≤V0L. Here, V0L is a measured value corresponding to an assumed overload (for example, 120%). At this time, if the measured value VX of the differential transformer 5a is out of the specified range, it is determined that the load detector 5 is abnormal, and an abnormality flag is set in step S3.
Exit this program and take further action.

[0008]

However, in the conventional elevator abnormality detecting device as described above, the output of the load detector 5 is from 0% in the cage load to overload (120%, for example).
Even if there was an abnormality within the range corresponding to, this abnormality could not be detected. Therefore, for example, in the case of a failure that shows a value lower than the actual load, even if a load that exceeds the overload is applied, it may not be determined to be overload, and there is a risk of a very dangerous state.

[0009] Therefore, an object of the present invention is to provide an elevator abnormality detecting device capable of surely detecting an abnormality of a load detector for detecting a load in a car of an elevator.

[0010]

An elevator abnormality detecting apparatus according to the invention of claim 1 uses a load detector for detecting a load inside a car of the elevator, and a load signal output from the load detector. An arithmetic controller that periodically calculates a predetermined program, controls the speed of the elevator car, and detects an overload condition in the car; and a door closing determination means that determines that the door of the elevator is in the door closed state. And when the door closing determination means determines that the door is closed, the difference between the value of the load signal input to the arithmetic controller and the value of the load signal input in the previous arithmetic cycle is predetermined. An abnormality determining means for determining that the load detector is abnormal when the value is equal to or more than a value is provided.

According to a second aspect of the present invention, there is provided an abnormality detecting apparatus for an elevator, wherein a load detector for detecting a load inside the elevator car and a load signal output from the load detector are used to periodically execute a predetermined program. And the first mode judgment for judging that the elevator car is in a stop state just before starting after controlling the speed of the elevator car and detecting an overload condition in the car Means, a second mode determination means for determining that the elevator car is in acceleration travel, a third mode determination means for determining that the elevator car is in constant speed travel, and the elevator car for deceleration travel A fourth mode determining means for determining that the elevator car is in the middle, a fifth mode determining means for determining that the elevator car is just before stopping and opening the door, and the first mode The difference of the second mode load signal, the difference between the second mode and the load signal of the third mode, the difference between the third mode and the load signal of the fourth mode, the fourth mode and the fifth
An abnormality determining means for determining that the load detector is abnormal when any one or more of the difference between the load signals of the modes is equal to or less than a predetermined value.

[0012]

In the elevator abnormality detecting apparatus according to the first aspect of the present invention, the overload state in the elevator car is detected by periodically calculating a predetermined program using the load signal output from the load detector. When the elevator door is in the door closed state, if the difference between the value of this load signal and the value of the load signal at the previous calculation cycle is a predetermined value or more, it is determined that the load detector is abnormal. Since it is a thing, despite the cage state that the output of the load detector does not change,
If the output of the load detector changes rapidly in a short time,
It is judged that the load detector is abnormal.

In the elevator abnormality detecting apparatus according to the second aspect of the present invention, the overload state in the elevator car is detected by periodically calculating a predetermined program using the load signal output from the load detector. When the elevator car closes the door and starts accelerating and accelerating, accelerating and constant speed, constant speed and decelerating, decelerating and immediately after stopping. If any one or more of the differences is less than or equal to a predetermined value, it is determined that the load detector is abnormal. Therefore, even if the operation state of the elevator car changes, the output of the load detector is almost the same. If it does not change, it is determined that the load detector is abnormal.

[0014]

Embodiments of the present invention will be described below. 3 to 5 are common to the respective embodiments of the present invention, the description thereof will be omitted here.

<First Embodiment> FIG. 1 is a flow chart showing an abnormality detecting program of an elevator abnormality detecting apparatus according to a first embodiment of the present invention. This program is stored in a ROM 8b of an arithmetic controller 8. The CPU 8a repeatedly calculates this program. In the figure, first,
In step S11, the measured value VX of the differential transformer 5a is read into the CPU 8a via the analog / digital converter 8e. Next, in step S12, it is determined whether the elevator door is in the door closed state. If the door is closed, step S13
Then, it is judged whether or not the absolute value of VX-VF is equal to or larger than a predetermined value VS. That is, | VX-VF | ≥VS is determined. Here, VF is the measured value VX in the previous calculation cycle set in step S14, and VS is a predetermined value for judging an abnormality. This predetermined value VS is set to a value exceeding the load change value due to the vibration generated by passengers in the car that may occur when the elevator is in the door closed state, the acceleration of the elevator, the deceleration, and the like. Normally, since | VX-VF | <VS, the measured value VX is set to VF in step S14, this program is ended, and the program is repeated again at a predetermined cycle. However, in step S13, | VX −VF | ≧
In the case of VS, it is determined that the load detector 5 is in an abnormal state, the abnormal flag is set in step S15, the program is terminated, and the subsequent steps are taken. If the elevator is not in the door closed state in step S12, the above step S
The determination of 13 is not performed, and the program is terminated as it is.

The abnormality of the load detector 5 can be judged by executing the series of programs shown in FIG. 1 above. Essentially, if the load detector 5 is normal, passengers get on and off when the elevator door is closed. Is not performed, there is almost no difference between the value VX of the load signal input from the load detector 5 to the calculation controller 8 and the value VF at the immediately preceding calculation cycle immediately before that.
Although it should be smaller than the predetermined value VS, the output suddenly changes (| VX-VF | ≥VS) because it is considered that an abnormality has occurred in the load detector 5.

As described above, the elevator abnormality detecting apparatus of this embodiment detects the load in the elevator car by the differential transformer 5a which outputs a voltage signal proportional to the contraction amount of the shackle spring 3b. Detector 5
And a load signal output from the load detector 5 to periodically calculate a predetermined program to control the speed of the elevator car and detect an overload condition in the car. 1 and the door closing judgment means for judging that the door of the elevator is in the door closed state in step S12 of FIG. 1, and the above-mentioned calculation when the door closing judgment means judges that the door is in the door closed state. When the difference | VX-VF | between the value VX of the load signal input to the controller 8 and the value VF of the load signal input in the previous calculation cycle is greater than or equal to the predetermined value VS (determination in step S13 of FIG. 1). If YES), it is determined that there is an abnormality in the load detector 5, and an abnormality determination unit that sets an abnormality flag in step S15 of FIG. 1 is provided.

That is, the elevator abnormality detecting apparatus of the present embodiment detects the overload state in the elevator car by periodically calculating a predetermined program using the load signal output from the load detector 5. When the door of the elevator is closed, the load detector 5 is determined to be abnormal if the difference between the value of the load signal and the value of the load signal at the previous calculation cycle is equal to or more than a predetermined value. To do.

Therefore, the load detector 5 can be used in a short time regardless of the cage state in which the output of the load detector 5 does not change.
If the output of the load detector 5 suddenly changes, it is determined that the load detector 5 is abnormal. Therefore, the output of the load detector 5 that could not be detected by the conventional abnormality is 0% in the cage load to overload (for example, 120 It is also possible to detect an abnormality within the range corresponding to (%). Therefore, even in the case of a failure indicating a value lower than the actual load, the abnormality of the load detector 5 can be reliably determined, and the safety of the elevator is enhanced.

<Second Embodiment> FIG. 2 is a flow chart showing an abnormality detecting program for an elevator abnormality detecting apparatus according to a second embodiment of the present invention. This program is stored in the ROM 8b of the arithmetic controller 8. The CPU 8a repeatedly calculates this program.

In the figure, first, in step S21, the measured value VX of the differential transformer 5a is read into the CPU 8a via the analog / digital converter 8e. Next, step S
In each process from 22 to step S26, the operation mode of the elevator is determined. That is, in step S22,
It is determined whether or not the elevator car is completely closed and is stopped just before starting. In step S23, it is determined whether or not the elevator car is accelerating, and in step S24, the elevator car is driven at a constant speed. It is determined whether or not the vehicle is traveling, and in step S25, it is determined whether or not the elevator car is traveling in deceleration. In step S26, it is determined whether or not the elevator car is stopped and is just before opening the door. to decide. Then, in each processing from step S27 to step S30, the measured value VX in each operation mode of the elevator
Are stored as measured values in the operation mode. That is, in step S27, the measured value VX is stored as the measured value V1 immediately before starting, in step S28, the measured value VX is stored as the measured value V2 during acceleration, and in step S29, the measured value VX is stored at constant speed. Medium weight value V3
In step S30, the measured value VX is stored as the measured value V4 during deceleration. Also, step S
The abnormality of the load detector 5 is determined in each processing from 31 to step S34. That is, when the absolute value of the difference between the measured value VX in the operation mode at that time and the measured values V1 to V4 in the operation mode immediately before that is less than or equal to the predetermined values VS1 to VS4, it is determined that the load detector 5 is abnormal. to decide. It should be noted that each of the predetermined values VS1 to VS4 is lower than the load change value that changes due to the influence of acceleration or deceleration while the elevator is stopped or traveling at low speed, or during acceleration traveling or deceleration traveling. Set to each value. Specifically, in step S31, it is determined whether or not the absolute value of VX-V1 is less than or equal to a predetermined value VS1, and in step S32, VX
It is determined whether or not the absolute value of X-V2 is less than or equal to the predetermined value VS2. In step S33, it is determined whether or not the absolute value of VX-V3 is less than or equal to the predetermined value VS3. In step S34, the absolute value of VX-V4 is determined. Is below a predetermined value VS4. In each of the processes of steps S31 to S34 described above, the load detector 5
If it is determined to be abnormal, the abnormality flag is set in step S35, the program is terminated, and the subsequent processing is performed.

The abnormality of the load detector 5 can be determined by executing the series of programs shown in FIG. 2 above. The reason is that if the load detector 5 is normal, the load detector 5 is weighed according to the operating state of the elevator. The value VX changes greatly, and the difference between the load signal values immediately before starting and during acceleration, during acceleration and constant speed, during constant speed and deceleration, and during deceleration and immediately after stopping |
VX -V1 to V4 | should be larger than the predetermined values VS1 to VS4, but its output hardly changes (| VX -V1
.About.V4 | .ltoreq.VS1 to VS4) because it can be considered that the load detector 5 is abnormal.

As described above, the elevator abnormality detecting apparatus of this embodiment detects the load inside the elevator car by the differential transformer 5a which outputs a voltage signal proportional to the contraction amount of the shackle spring 3b. A load detector 5 similar to the above and a load signal output from the load detector 5 are used to periodically calculate a predetermined program to control the speed of the elevator car and detect an overload condition in the car. The same operation controller 8 as in the above-described first embodiment, first mode determination means for determining in step S22 of FIG. 2 that the elevator car has completed the door closing and is being stopped immediately before starting, and the elevator. Figure 2 shows that the car is accelerating
The second mode determining means for determining in step S23, the third mode determining means for determining in step S24 of FIG. 2 that the elevator car is traveling at a constant speed, and the elevator car during decelerating traveling. Step S of FIG.
25, a fourth mode determining means, a fifth mode determining means for determining in step S26 in FIG. 2 that the elevator car has just stopped and opened the door, and the first mode and the second mode. Load signal difference | VX-V1 |, load signal difference between the second and third modes | VX-V2 |, load signal difference between the third and fourth modes | VX-V3
|, The difference between the load signals of the fourth mode and the fifth mode | VX −
The difference of at least one of V4 | is a predetermined value VS1 to VS
When 4 or less (step S31 to step S in FIG. 2)
If YES in any of the determinations in 34), it is determined that the load detector 5 is abnormal, and an abnormality determination unit that sets an abnormality flag in step S35 of FIG. 2 is provided.

That is, the elevator abnormality detecting apparatus of this embodiment detects an overload state in the elevator car by periodically calculating a predetermined program using the load signal output from the load detector 5. When the elevator car closes the door and is stopped just before starting, the value of the load signal when the elevator car is accelerating, and the value of the load signal when the elevator car is running at constant speed. If at least one of the differences between the value of the load signal while the elevator car is decelerating and the value of the load signal immediately before the elevator car stops and opens the door is less than or equal to a predetermined value, The load detector 5 is determined to be abnormal.

Therefore, when the output of the load detector 5 hardly changes even when the operating condition of the elevator car changes, it is determined that the load detector 5 is abnormal, and thus it has not been possible to detect the abnormality in the past. It is also possible to detect an abnormality within the range in which the output of the load detector 5 corresponds to the in-car load of 0% to the overload (for example, 120%). Therefore, even in the case of a failure indicating a value lower than the actual load, the abnormality of the load detector 5 can be reliably determined, and the safety of the elevator is enhanced.

By the way, in the above description, the elevator abnormality detecting device has been described by dividing it into two embodiments, the first embodiment and the second embodiment. However, combining both embodiments, one elevator abnormality detecting device. It doesn't matter. That is, when the elevator is in the door closed state, when the difference between the value of the load signal input from the load detector 5 to the arithmetic controller 8 and the value in the previous arithmetic processing is a predetermined value or more, the load detection is performed. Difference between load signals immediately before starting the elevator car and during acceleration traveling, during acceleration traveling and constant speed traveling, during constant speed traveling and deceleration traveling, during deceleration traveling and immediately after stopping May be determined to be abnormal when the load detector 5 is abnormal.

[0027]

As described above, the elevator abnormality detecting device according to the first aspect of the present invention includes the load detector, the arithmetic controller, the door closing determining means, and the abnormality determining means. The value of this load signal when the door of the elevator is closed when detecting the overload condition in the elevator car by periodically calculating a predetermined program using the load signal output from If the difference between the value of the load signal and the value of the load signal at the previous calculation cycle is greater than or equal to a predetermined value, it is determined that the load detector is abnormal, and the output of the load detector does not change, regardless of the cage state, When the output of the load detector suddenly changes in a short time, it is determined that the load detector is abnormal. Therefore, the abnormality of the load detector can be reliably determined, and the safety of the elevator is enhanced.

An elevator abnormality detecting device according to a second aspect of the present invention is a load detector, a calculation controller, a first mode determining means, a second mode determining means, and a third mode determining means.
A fourth mode determination means, a fifth mode determination means, and an abnormality determination means are provided, and the load signal output from the load detector is used to periodically calculate a predetermined program to detect an error in the elevator car. When detecting the load condition, the load signal immediately before starting and during acceleration running, during acceleration running, during constant speed running, during constant speed running and deceleration running, during deceleration running and immediately after stopping when the elevator car is closed If any one or more of the differences in the values of the above are less than or equal to a predetermined value, it is determined that the load detector is abnormal, and the output of the load detector is changed even if the operation state of the elevator car changes. When there is almost no change, it is determined that the load detector is abnormal, so that the load detector can be reliably determined and the elevator safety is improved.

[Brief description of drawings]

FIG. 1 is a flowchart showing an abnormality detection program of an elevator abnormality detection device according to a first embodiment of the present invention.

FIG. 2 is a flow chart showing an abnormality detecting program of an elevator abnormality detecting device according to a second embodiment of the present invention.

FIG. 3 is a hardware configuration diagram showing an elevator control system.

FIG. 4 is a configuration diagram showing a load detector of an elevator.

FIG. 5 is a characteristic diagram showing the relationship between the load in the elevator car and the measured value of the differential transformer.

FIG. 6 is a flowchart showing an abnormality detection program of a conventional elevator abnormality detection device.

[Explanation of symbols]

 1 sheave 2 sheave 3 rope 3a shackle 3b shackle spring 4 elevator car 4a upper beam 5 load detector 5a differential transformer 6 counterweight 7 moving cable 8 arithmetic controller 8a CPU 8b ROM 8c RAM 8d bus 8e analog / digital Converter 9 Electric motor

Claims (2)

[Claims] 1. A load detector for detecting a load inside a car of an elevator, and a load signal output from the load detector is used to periodically calculate a predetermined program to control the speed of the elevator car. An arithmetic and control unit for detecting an overload state in the car, a door closing determination means for determining that the elevator door is in a door closed state, and the door closing determination means for determining that the door is in a door closed state. When the difference between the value of the load signal input to the arithmetic and control unit and the value of the load signal input in the previous arithmetic cycle is a predetermined value or more, an abnormality determining means for determining an abnormality of the load detector. An elevator abnormality detection device comprising: 2. A load detector for detecting a load in an elevator car and a load signal output from the load detector are used to periodically calculate a predetermined program to control the speed of the elevator car. An arithmetic and control unit for detecting an overload condition in the car, a first mode judging means for judging that the elevator car is in the state of being closed just before the start of the elevator car, and the elevator car is accelerating. Second mode determining means for determining that the elevator car is traveling at a constant speed, third mode determining means for determining that the elevator car is traveling at a constant speed, and fourth mode determining means for determining that the elevator car is traveling at a decelerating speed. A fifth mode determining means for determining that the elevator car is just before stopping and opening the door; a difference between load signals in the first mode and the second mode;
Any one or more of a difference between the load signals of the mode and the third mode, a difference between the load signals of the third mode and the fourth mode, and a difference of the load signals of the fourth mode and the fifth mode are predetermined. An abnormality detecting device for an elevator, comprising: abnormality determining means for determining that the load detector is abnormal when the value is less than or equal to a value.