JP2002154760A - Overload detecting device for elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately detect an overload independently of an elevating position of a car. SOLUTION: Quantity of a change of a load of a compensating rope and a tail cord to be applied to a car 1 and to be changed in response to an elevating position of the car 1 is previously stored in a correction data memory unit 35. When an overload is really detected, a load detection value correction unit 33 corrects a detection value of the load with a linear homer 17 on the basis of the correction data, and an overload judging unit 34 judges an overload when a detection value after the correction exceeds the predetermined limit value. With this structure, an overload is judged after the correction corresponding to the quantity of a change of the load to be changed in response to the elevating position of the car 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overload detecting device for an elevator, which detects an overload when a load equal to or more than a rated load is loaded on the elevator car, and more particularly to a lift position of the elevator car. The present invention relates to a technique for accurately detecting an overload regardless of the above.

[0002]

2. Description of the Related Art FIG. 5 is a perspective view showing the structure of an elevator car. Car 1 for loading passengers and cargo
Is supported by a car frame composed of a vertical frame 2, a lower beam 3, an upper beam 4, and the like. At the center of the upper surface of the upper beam 4, a retaining plate 5 for retaining a plurality of main ropes 6 for suspending the car 1 is fixed.
Each of the plurality of main ropes 6 has a stopper 7 attached to the lower end thereof, and is connected to the stopper plate 5 by the stopper 7.

FIG. 6 is a sectional view showing the structure of the upper beam center portion of the upper beam 4 in detail. The stoppers 7 attached to the lower ends of the plurality of main ropes 6 respectively penetrate in a non-contact manner so that the tip rods 11 pass through the through holes 5 a provided in the stopper plate 5 so as to pass through the compression springs 8. A spring receiver 9 for receiving the compression spring 8 and a double nut 10 for stopping the spring are provided at the end.

A detecting plate 14 is fixed to the tip rod 11 above the retaining plate 5. An overload detection limit switch 15 is fixed to the lower end of the detection plate 14, and an overload detection limit switch cam 16 is mounted on the upper surface of the retaining plate 5 at a position corresponding to the overload detection limit switch 15.
Is fixed. Further, a linear homer 17 is fixed to the center of the upper surface of the retaining plate 5, and the linear homer rod 18 is fixed thereto.
Are fixed to the detection plate 14.

In such a configuration, when the load of the car 1 changes due to a passenger or a load, the compression spring 8 is moved through the car frame by the vertical frame 2, the lower beam 3, the upper end 4 and the like and the retaining plate 5. , The compression spring 8 contracts, and the gap A between the car-side restraint plate 5 and the main rope-side detection plate 14 increases. Due to the change in the gap size A, the overload detection limit switch cam 16 fixed to the retaining plate 5 moves downward, and the load of the car 1 exceeds, for example, 110% of the normal rated load. At this point, an overload is detected by the overload detection limit switch.

The detection of the overload is intended to prevent the occurrence of an accident in which the landing position of the car 1 becomes inaccurate due to overloading and the so-called canned state or the like occurs in advance. Is detected, a buzzer or indicator light installed in the car 1 warns of overload, and the automatic closing of doors is stopped to activate the elevator until the overloaded condition is resolved. I try not to.

Further, the linear changer 17 detects a continuous change amount of the gap dimension A between the retaining plate 5 and the detection plate 14, and detects the loaded load in the car 1 based on the detected value to operate the elevator. The control amount of the torque applied to the driven hoist and the selection control of the elevator operation pattern are performed.

FIG. 7 is a sectional view showing the structure of the entire elevator. The car 1 is arranged inside the hoistway 26,
The hoisting machine 20 is installed inside the machine room 25 above the hoistway 26.
And a control panel 22. The car 1 is suspended by a main rope 21 wound up by a hoisting machine 20. At the other end of the main rope 21, a counterweight 27 for balancing the car 1 is suspended. A compensating rope 23 is suspended from the car 1 and the counterweight 27 so as to adjust the predetermined amount of torque generated by the motor of the hoisting machine 20 in accordance with the elevation position of the car 1.

The control panel 22 manages call signals and the like when calling the car 1 on each floor. A tail cord 24 containing a signal line used for that purpose is suspended from the control panel 22. The other end of the tail cord 24 is fixed to the lower surface of the car 1.

[0010]

[Problems to be Solved by the Invention] However, the car 1
Not only the load of the passenger and the load, but also the load of the compensating rope 23 and the tail cord 24, and the above-described overload limit switch 15 and linear former 17 detect these loads. Become. That is, when the car 1 is stopped on the lower floor, the load applied to the car 1 by the compensating ropes 23 and the tail cord 24 is small, and when the car 1 is stopped on the upper floor, Since the load becomes large, it becomes impossible to accurately detect the overload of the car 1.

For this reason, even if the overload detection limit switch 15 detects that the overload is not detected by the overload detection limit switch 15 at the lowest floor, the same load amount is detected by the overload detection limit switch at the top floor. In some cases, the elevator doors do not close and the elevator cannot be started.

Further, the overload detection limit switch 15 and the linear former 17 are changed due to environmental changes such as temperature and humidity, changes in the spring constant and deflection of the compression spring 8 due to long-time use of the elevator, and deterioration of other equipment. In some cases, the load on the car 1 cannot be accurately detected, and the landing accuracy of the car 1 becomes unstable, which may cause a failure accident.

The present invention has been made in view of the above, and an object of the present invention is to provide an elevator overload detection device capable of accurately detecting an overload regardless of the elevator position of a car. is there.

Another object of the present invention is to provide an elevator overload detecting device capable of preventing erroneous detection of a load due to environmental changes, equipment deterioration, and the like.

Still another object of the present invention is to provide an elevator overload detection device capable of preventing occurrence of a failure accident due to erroneous load detection.

[0016]

According to a first aspect of the present invention, there is provided an elevator overload detecting apparatus for detecting a load applied to a car of an elevator. Correction data storage means for storing, as correction data, the amount of change in the load applied to the car that varies depending on the elevation position; correction means for correcting the value detected by the load detection means using the correction data; and the correction means Determining means for determining that an overload has occurred when the detected value corrected by exceeds a predetermined limit value,
It is characterized by having.

In the present invention, the amount of change in the load of the compensating rope, the tail cord, etc. on the car, which varies depending on the position of the car, is stored as correction data, and the actual amount of overload detection is stored. In this case, the load detection value by the load detection means is corrected using this correction data, and when the corrected detection value exceeds a predetermined limit value, it is determined that the load is overloaded, Since the overload is determined after making a correction corresponding to the amount of change in the load that changes depending on the elevation position of the car, the overload can be accurately detected regardless of the elevation position of the car.

Here, as the load detecting means, for example, a linear former capable of continuously detecting a change in load is used. Also, as the predetermined limit value,
For example, it is set so as to be one hundred and several ten percent of the normal rated load capacity.

According to a second aspect of the present invention, in the elevator overload detecting apparatus according to the first aspect, the correction data includes:
The car is stopped on each floor from the lowest floor to the top floor with no load, and the load at the lowest floor is obtained by subtracting the load at the lowest floor from the load detected at each floor by the load detecting means. And

According to a third aspect of the present invention, in the elevator overload detecting apparatus according to the first or second aspect, when the load applied to the car exceeds a predetermined limit value, it is detected that the car is overloaded. An overload detection unit is provided, and the correction unit and the determination unit operate when an overload is detected by the overload detection unit.

In the present invention, when the overload is detected by the overload detection means as a rough guide, the correction means and the judgment means are operated, so that it is necessary to accurately determine the overload. In a state where no normal load is loaded, the correction means and the judgment means do not need to operate, so that power consumption can be reduced accordingly.

Here, as the overload detecting means, for example, an overload detecting limit switch or the like is used. Further, as the predetermined limit value, the same value as the predetermined limit value described in claim 1 or a different value may be used.

The present invention described in claim 4 provides the present invention according to claims 1 to 3
In the elevator overload detection device according to any one of the above, the correction data is obtained again by the method according to claim 2, wherein the storage unit newly obtains the stored correction data. It can be updated by the corrected data.

In the present invention, the stored correction data is updated with the correction data obtained again, so that correction data corresponding to environmental changes such as temperature and humidity, equipment deterioration, and the like can be obtained. Therefore, erroneous detection of a load due to an environmental change, deterioration of equipment, or the like can be prevented.

The present invention according to claim 5 provides the invention according to claim 3 or 4.
In the elevator overload detection device described above, when the correction data is updated, the newly obtained correction data is compared with the previous correction data, and when the difference between the two exceeds a predetermined value, the load detection means And a comparing and judging means for judging that there is an abnormality in the load detection by the means. The overload is determined using the detection result of the overload detecting means.

In the present invention, when it is determined that there is an abnormality in the detection by the load detecting means, the detection result by the overload detecting means is used instead of using the corrected detection value by the load detecting means. Is used to determine the overload, it is possible to prevent the occurrence of a failure accident due to erroneous detection of the load.

According to a sixth aspect of the present invention, in the elevator overload detecting apparatus according to the fifth aspect, when the comparison and determination means determines that there is an abnormality, the inspection and adjustment of the load detection means is required. It has a notifying means for notifying.

According to the present invention, when it is determined that there is an abnormality in the detection by the load detecting means, it is notified that the inspection and adjustment are necessary, thereby prompting the early inspection and adjustment. It is possible to prevent the occurrence of a failure accident due to erroneous detection of the load.

The present invention according to claim 7 provides the present invention according to claim 5 or 6.
In the elevator overload detection device according to the above, when the difference between the newly obtained correction data and the previous correction data exceeds a value set to be larger than the predetermined value according to claim 5, the elevator It is characterized by having operation stop means for stopping operation.

In the present invention, when the difference between the newly obtained correction data and the previous correction data exceeds a value set to be larger than a predetermined value, load detection is performed. Since the operation of the elevator is stopped because it is presumed that a serious abnormality has occurred in the detection by the means, it is possible to prevent the occurrence of a failure accident due to erroneous detection of the load.

The present invention according to claim 8 provides the present invention according to claim 6 or 7.
In the elevator overload detection device according to the above, after the inspection and adjustment of the load detection means, when the comparison and determination means again determines that there is an abnormality, a notification that the inspection and adjustment of the load detection means need to be performed again is performed. It has a notifying means.

The present invention described in claim 9 provides the present invention according to claims 3 to 8
In the elevator overload detection device according to any one of the above, a detection value storage means for storing in advance a detection value by the load detection means when an overload is detected by the overload detection means, this detection value Comparing the detection value stored in the storage means with the detection value by the load detection means when an overload is detected by the overload detection means during use of the elevator, and when the difference between the two exceeds a predetermined value; A comparing and judging means for judging that there is an abnormality in the load detection by the load detecting means, and a notifying means for notifying that the inspection and adjustment of the load detecting means are necessary when it is judged that the load detecting means is abnormal. , Is characterized by having.

In the present invention, the value detected by the load detecting means when the overload is detected by the overload detecting means stored in advance and the value detected by the overload detecting means during the actual use of the elevator. Compares the value detected by the overload detector when overload is detected, and if the difference between the two exceeds a predetermined value, determines that inspection and adjustment of the load detector is necessary and reports that fact. By doing so, it is possible to prevent erroneous detection of a load due to environmental changes, deterioration of equipment, and the like, and it is possible to prevent a failure accident caused by erroneous detection of a load.

According to a tenth aspect of the present invention, in the elevator overload detecting apparatus according to the ninth aspect, the detected value stored in the detected value storing means and the overload detecting means during the use of the elevator. If the difference from the value detected by the load detection means when the load is detected exceeds a value set to be larger than the predetermined value according to claim 9, the vehicle has operation stop means for stopping operation of the elevator. It is characterized by the following.

According to the present invention, the detection value detected by the load detection means when the overload is detected by the overload detection means is compared with the detection value stored in the detection value storage means during use of the elevator. If the difference from the detected value exceeds a value set to be larger than the predetermined value according to claim 9, it is presumed that a serious abnormality has occurred in the detection by the load detecting means, so that the elevator , The occurrence of a failure accident due to an erroneous load detection can be prevented.

[0036]

Embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment] FIG. 1 is a block diagram showing the configuration of an elevator overload detecting apparatus according to one embodiment. The overload detection device shown in FIG. 1 has a configuration including an overload detection limit switch 15, a linear former 17, and an overload detection control device 30. The overload detection limit switch 15 and the linear homer 17 are disposed at the positions shown in FIG. 6, and the overload detection control device 30 is disposed, for example, inside the control panel 22 shown in FIG.

The overload detection control device 30 includes an input conversion circuit 31, an input processing unit 32, a load detection value correction unit 33,
The configuration includes an overload determination unit 34 and a correction data storage unit 35.

The overload detection limit switch 15 is used to set a load applied to the car 1 to a predetermined limit value, for example, a normal rated value, when the car 1 is at the lowest floor position in the initial adjustment when the elevator is installed. Adjustment is made to detect overload when the load exceeds 110%. Then, when the load applied to the car 1 on each floor exceeds the predetermined value, it is detected that the load is excessive as a tentative measure, and the detection result is notified to the load detection value correction unit 33.

As shown in FIG. 6, the linear former 17 continuously detects the variation of the gap dimension A between the car-side restraint plate 5 and the main rope-side detection plate 14, and this variation is A load signal indicating a detection value based on the input signal is sent to the input conversion circuit 31.

The input conversion circuit 31 converts the load signal from the linear homer 17 from an analog signal to a digital signal, and sends the digital signal to the input processing unit 32.

The input processing section 32 performs signal processing such as noise removal and amplitude adjustment on the digitalized load signal, and sends the signal to the load detection value correction section 33.

The load detection value correction section 33 receives a notification of a detection result when an overload is detected on an arbitrary floor by the overload detection limit switch 15 and is sent from the input processing section 32 as described later. The corrected load signal is corrected using the correction data stored in the correction data storage unit 35, and the corrected load signal is sent to the overload determination unit 34. In addition, when the detection result is not notified from the overload detection limit switch 15, the operation is not performed.

The overload judging section 34 judges that an overload has occurred when the detected value in the corrected load signal from the load detection value correcting section 33 exceeds a predetermined limit value, and automatically closes the door to that effect. The operation stop device 36 and the alarm device 37 are notified. As the predetermined limit value, it is desirable to use the same value as the limit value used in the overload detection limit switch 15, but it is not limited to this. Also, when there is no notification of the detection result from the overload detection limit switch 15, the same operation as the load detection value correction unit 33 is not performed.

The automatic door closing operation restricting device 36 is disposed, for example, inside the control panel 22, and stops the automatic closing operation of the door of the car 1 when an overload is notified.

The alarm device 37 is disposed, for example, as a buzzer or an indicator light on the upper wall of the car 1 and, when receiving an overload notification, informs a person inside the car 1 of the fact.

The correction data storage unit 35 stores, as correction data, the amount of change in the load applied to the car 1 that varies depending on the position of the elevator.

Next, the correction data will be described with reference to FIG. FIG. 7A is a graph showing the load when the overload detection limit switch 15 starts detecting the overload. The vertical axis indicates the load of the car 1, the horizontal axis indicates the vertical position of the car 1, the solid line indicates the load on the car 1 when overload detection is started, and the broken line indicates the predetermined value of the overload detection limit switch 15. Limit value (overload limit value)
Are respectively shown. In the figure, the amount of change in the load that changes according to the position of the car 1 ascending and descending is shown as an overload detection error.

As shown in the figure, the higher the elevation position of the car 1, the greater the load of the compensating rope 23 and the tail cord 24 is applied to the car 1. The loaded load of the car 1 at the time when the detection of the overload shown starts is reduced. Therefore, the overload detection limit switch 15 detects an overload when the load on the car exceeds the value indicated by the solid line. However, actually, even if the car 1 is loaded on the car 1 up to the overload limit value indicated by the broken line, no problem occurs.

FIG. 5B is a graph showing the detected value of the load by the linear homer 17 when no load is performed. The vertical axis represents the value detected by the linear homer 17, the horizontal axis represents the vertical position of the car 1, the solid line represents the value detected by the linear homer 17 due to the change in the vertical position of the car 1, and the broken line represents the value detected by the linear homer 17 when the lowest floor stops. Are respectively shown.

As shown in the figure, even when the car 1 is in a non-loaded state, the higher the elevation position of the car 1, the greater the load on the compensating rope 23 and the tail cord 24. Therefore, the value detected by the linear homer 17 increases accordingly. At this time, the difference between the detected value of the linear homer 17 on each floor and the detected value of the linear homer 17 when the lowest floor stops is equivalent to the load caused by the compensating rope 23 and the tail cord 24 that changes depending on the position of the car 1 ascending and descending. The difference is stored in advance in the correction data storage unit 35 as correction data.

Next, the operation of the present embodiment will be described with reference to FIG.
This will be described with reference to FIG. FIG. 3 is a flowchart illustrating a flow of a process in the overload detection device.

In step 1 (referred to as S1 in the figure, the same applies hereinafter), if the elevator is stopped and the door is open, the process proceeds to step 2; otherwise, the process waits until the door is opened.

In step 2, when an overload is detected by the overload detection limit switch 15, the detection result is notified to the load detection value correction unit 33 and the process proceeds to step 3, and otherwise, the process returns to step 1. .

In step 3, first, the load detection value correction unit 3
At 3, the correction processing of the load detection value by the linear former 17 is performed. In this correction processing, the correction data corresponding to the floor at that time is read from the correction data storage unit 35, and the correction data is subtracted from the detection value of the linear homer 17. The detected value corrected in this manner is compared with a predetermined limit value by the overload judging section 34. If it exceeds the predetermined limit value, the process proceeds to step 4; otherwise, the process returns to step 1.

In step 4, the overload judging section 34 judges that the overload is present because the corrected detected value exceeds the predetermined limit value.
By notifying to the alarm device 37, the reduction of the load and the like is urged.

Therefore, according to the present embodiment, the amount of change in the load applied to the car 1 that varies depending on the position of the car 1 ascending and descending is stored in advance in the correction data storage unit 35 as correction data, and the actual excess At the time of load detection, the load detection value correction unit 33 corrects the value detected by the linear homer 17 using this correction data, and the overload determination unit 34 determines if the corrected detection value exceeds a predetermined limit value. Since it is determined that the load is a load, an overload is determined after performing a correction corresponding to the amount of change in the load that changes depending on the position of the car 1, regardless of the position of the car 1. Overload can be accurately detected.

Further, according to the present embodiment, when there is no notification of the detection result of overload detection from the overload detection limit switch 15 as a tentative measure, the load detection value correction unit 33 and the overload determination unit 34 operate. Since the load detection value correction unit 33 and the overload determination unit 34 do not need to operate when a normal load that does not need to be accurately determined is loaded, the load detection value correction unit 33 and the overload determination unit 34 do not need to operate. Power consumption can be reduced.

[Second Embodiment] FIG. 4 is a block diagram showing a configuration of an elevator overload detecting apparatus according to the present embodiment. The overload detection device for an elevator shown in the figure includes an overload detection control device 40 instead of the overload detection control device 30 in FIG.

The overload detection control device 40 includes an input conversion circuit 31, an input processing unit 42, and a load detection value correction unit 43.
, An overload judging unit 44, a correction data storage unit 45, a comparison judging unit 46, a correction stop command output unit 47, an alarm command output unit 48, and an operation stop command output unit 49. The input processing unit 42, the load detection value correction unit 43, the overload determination unit 44, and the correction data storage unit 45 have the same functions as those shown in FIG. 1 and also have other functions. The reference numerals different from those in FIG. In addition, the same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted here.

Next, the function of the elevator overload detecting device of the present embodiment will be described only for the points different from those shown in the first embodiment.

The correction data storage unit 45 updates the correction data based on a correction data update command from the elevator control device 50. This elevator control device 50 outputs a correction data update command to the correction data storage unit 45 when the car 1 is in a no-load state after the completion of the parking operation (pause operation) of the elevator, and the lowest floor of the car 1 Stop operation is performed on each floor from to the top floor.

At this time, the linear homer 17 detects the load applied to the car 1 for each floor from the lowest floor. The input processing unit 42 obtains new correction data by subtracting the detection value at the lowest floor from the detection value of the linear homer 17 on each floor, sends it to the correction data storage unit 45, and updates the old correction data. Load detection value correction unit 43
Then, the detection value of the linear homer 17 is corrected using the updated correction data.

In the comparison / determination section 46, the correction data storage section 4
5, the new correction data from the input processing unit 42 is compared with the old correction data from the correction data storage unit 45, and if the difference exceeds a predetermined value, the linear homer 17 is updated. It is determined that there is an abnormality in the load detection based on the above, and the fact is notified to the correction stop command output unit 47 and the warning command output unit 48. If the difference exceeds a predetermined value which is set to a larger value, it is determined that there is a serious abnormality in the load detection by the linear homer 17 and the operation stop command output unit 49 is notified of the fact.

When receiving a notification from the comparison / determination unit 46 that the load detection by the linear homer 17 is abnormal, the correction stop command output unit 47 outputs a correction stop command to the load detection value correction unit 43, and The correction of the detection value by 17 is not performed. At this time, when the load detection value correction unit 43 receives a notification of the detection result when the overload is detected from the overload detection limit switch 15, the load detection value correction unit 43 sends the notification to the overload determination unit 43 as it is.
The overload judging section 44 judges that an overload has occurred when the notification is received.

In the alarm command output unit 48, the comparison judgment unit 46
, A warning command is output to the warning device 51, and a buzzer, an indicator light, or the like notifies that the inspection and adjustment are necessary.

The operation stop command output unit 49 outputs an operation stop command to the operation stop control device 52 when the notification indicating that the detection by the linear homer 17 is abnormal is received from the comparison determination unit 46, and the operation of the elevator is performed. Pause.

After the inspection and adjustment by the inspector and the like, if the comparison / determination unit 46 determines that the load detection by the linear homer 17 is again abnormal, the warning command output unit 48
Outputs an alarm command to the alarm device 51 to notify that the inspection and adjustment are necessary again. Similarly, the correction stop command output unit 47 outputs the correction stop command to the load detection value correction unit 43, and the operation stop command output unit 49 outputs the operation stop command to the operation stop control unit 52.

Therefore, according to the present embodiment, by updating the correction data stored in the correction data storage section 45, the load caused by environmental changes such as temperature and humidity, deterioration of equipment, etc. Can be prevented from being erroneously detected.

Further, according to the present embodiment, when the correction data is updated, when the difference between the new correction data and the previous correction data exceeds a predetermined value by the comparison / determination unit 46, the linear former 17 is used. It is determined that there is an abnormality in the load detection, the load detection value correction unit 42 does not correct the detection value by the linear homer 17, and the overload determination unit 44 uses the notification of the detection result by the overload detection limit switch 15 to notify By judging the load, it is possible to prevent the occurrence of a failure accident due to erroneous detection of the load.

Further, according to the present embodiment, when the difference between the new correction data and the previous correction data exceeds a predetermined value, it is determined that there is an abnormality in the load detection by the linear former 17 and the alarm device is provided. Since the 51 is notified of the fact, it is possible to perform the inspection and adjustment of the overload detection device at an early stage, and it is possible to prevent the occurrence of a failure accident due to the erroneous detection of the load. .

Further, according to the present embodiment, when the difference between the new correction data and the previous correction data exceeds a predetermined value which is set to a larger value, serious abnormality is detected in the load detection by the linear former 17. It is determined that there is a fault, and the operation stop control device 52 stops the operation of the elevator, thereby preventing the occurrence of a failure accident due to instability of landing accuracy due to erroneous detection of load. it can.

[Third Embodiment] The basic configuration of an elevator overload detecting apparatus according to the present embodiment is the same as that of FIG.
6 is different only in that a new function is added, and only the added function will be described here.

In addition to storing the correction data, the correction data storage unit 45 stores the load by the linear homer 17 when the overload detection limit switch 15 detects an overload immediately after the initial adjustment and the inspection adjustment of the linear homer 17 are completed. Is stored. In this regard, the correction data storage unit 4
Reference numeral 5 also functions as a detection value storage unit.

In the comparison / determination section 46, the correction data storage section 4
5 is compared with the load value detected by the linear homer 17 when an overload is detected by the overload detection limit switch 15 during actual use of the elevator, and the difference between the two values is a predetermined value. If it exceeds, it is determined that there is an abnormality in the load detection by the linear former 17, and the warning command output unit 48 is notified of that fact. If the difference between the two exceeds a predetermined value which is set to a larger value, it is determined that there is a serious abnormality in the load detection by the linear homer 17 and the operation stop command output unit 49 is notified of the fact.

In the warning command output unit 48, the comparison judgment unit 46
When a notification is received from the controller, a warning command is output to the alarm device 51 to notify the user of the warning command and to urge inspection and adjustment.

The operation stop command output unit 49 outputs an operation stop command to the operation stop control unit 52 to stop the operation of the elevator when receiving the notification from the comparison determination unit 46.

Therefore, according to the present embodiment, the value detected by the linear former 17 when the overload is detected by the overload detection limit switch 15 stored in the correction data storage section 45 in advance and the actual elevator When the overload is detected by the overload detection limit switch 15 during use, the value detected by the linear homer 17 is compared with the detected value. If the difference between the two exceeds a predetermined value, the linear homer 17 needs to be inspected and adjusted. And informs the user of this fact, which can prevent erroneous detection of load due to environmental changes or deterioration of equipment, and prevent failures caused by erroneous detection of load. Can be prevented.

Further, according to this embodiment, when the difference between the two exceeds a predetermined value which is set to a larger value, it is determined that there is a serious abnormality in the load detection by the linear homer 17 and the operation of the elevator is determined. By stopping the
It is possible to prevent a failure accident due to erroneous load detection from occurring.

[0080]

As described above, according to the elevator overload detecting apparatus of the present invention, the amount of change in the load applied to the car, which changes depending on the position of the car, is stored as correction data. At the time of actual overload detection, the load detection value by the load detection means is corrected using this correction data, and if the corrected detection value exceeds a predetermined limit value, it is determined that the load is overload. By doing so, the overload is determined after making a correction corresponding to the amount of change in the load that changes depending on the elevator position of the car, so it is necessary to accurately detect the overload regardless of the elevator position of the car Can be.

Further, according to the elevator overload detecting apparatus of the present invention, the stored correction data is updated with the re-obtained correction data, so that the stored correction data can be updated in response to environmental changes and equipment deterioration. The corrected data can be used, so that erroneous detection of a load due to an environmental change, equipment deterioration, or the like can be prevented.

According to the apparatus for detecting overload of an elevator according to the present invention, when it is determined that there is an abnormality in load detection, an overload detecting means is used instead of using the corrected detected value of load. To judge overload by using the detection result of the above, and to notify that the inspection and adjustment are necessary, or to stop the operation of the elevator to prevent the occurrence of failure accident due to erroneous detection of load. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an elevator overload detection device according to a first embodiment.

FIG. 2A shows an overload detection limit switch 15;
FIG. 6B is a graph showing a load at which overload detection is started, and FIG.
7 is a graph showing a detected value of a load according to Example 7;

FIG. 3 is a flowchart showing a flow of a process performed by the elevator overload detection device.

FIG. 4 is a block diagram illustrating a configuration of an elevator overload detection device according to a second embodiment.

FIG. 5 is a three-dimensional view showing a configuration of an elevator car according to the related art.

FIG. 6 is a cross-sectional view showing in detail a structure of a central portion of an upper beam of an upper beam of a car in the related art.

FIG. 7 is a cross-sectional view showing the configuration of an entire elevator according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Riding car 2 Vertical frame 3 Lower beam 4 Upper beam 5 Detention plate 5a Through hole 6 Main cable 7 Detention tool 8 Compression spring 9 Spring receiver 10 Double nut 11 Tip rod 14 Detection plate 15 Overload detection limit switch 16 Over Load detection limit switch cam 17 Linear homer 18 Linear homer rod 20 Hoisting machine 21 Main rope 22 Control panel 23 Compensating rope 24 Tail cord 25 Machine room 26 Hoistway 27 Counterweight 30, 40 Overload detection control device 31 Input conversion Circuits 32, 42 Input processing unit 33, 43 Load detection value correction unit 34, 44 Overload determination unit 35, 45 Correction data storage unit 36 Automatic door closing operation suppression device 37 Alarm device 46 Comparison determination unit 47 Correction stop command output unit 48 Alarm command output unit 49 Operation stop command output unit 50 Elevator control device 51 Warning device 52 Operation suspension control device

Claims (10)

[Claims] 1. A load detecting means for detecting a load applied to a car of an elevator, a correction data storing means for storing, as correction data, an amount of change in a load applied to the car which varies according to an elevation position, Correction means for correcting the detection value by the load detection means using the correction data, and determination means for determining that the load is overload when the detection value corrected by the correction means exceeds a predetermined limit value. An overload detection device for an elevator, comprising: 2. The correction data, wherein the car is stopped and operated on each floor from the lowest floor to the top floor in a state of no loading, and the load detecting means detects the load on each floor from the lowest floor to the lowest floor. The elevator overload detecting device according to claim 1, wherein the device is obtained by subtracting the load of (1). 3. An overload detecting means for detecting an overload when the load applied to the car exceeds a predetermined limit value, wherein the correcting means and the judging means detect the overload. 3. The overload detecting device for an elevator according to claim 1, wherein the device operates when an overload is detected by the means. 4. The correction data is obtained again by the method according to claim 2, wherein the storage unit is capable of updating stored correction data with newly obtained correction data. The elevator overload detection device according to any one of claims 1 to 3, wherein: 5. When the correction data is updated, the newly obtained correction data is compared with the previous correction data, and if the difference between the two exceeds a predetermined value, the load detection means detects abnormal load detection. A comparison / determination unit that determines that there is a fault. When the comparison / determination unit determines that there is an abnormality, the overload detection is performed instead of using the detection value corrected by the correction unit. 5. The overload detecting device for an elevator according to claim 3, wherein the overload is determined using a detection result by the means. 6. An overload of an elevator according to claim 5, further comprising a notifying means for notifying that the inspection and adjustment of said load detecting means is necessary when said comparing and judging means judges an abnormality. Detection device. 7. An operation for suspending operation of an elevator when a difference between the newly obtained correction data and a previous correction data exceeds a value set to be larger than a predetermined value according to claim 5. 6. The apparatus according to claim 5, further comprising a pause unit.
Or the overload detection device for an elevator according to 6. 8. A re-notification means for notifying that the load detection means needs to be checked and adjusted again when the comparison and determination means determines that the load detection means is abnormal again after the inspection and adjustment of the load detection means. The elevator overload detecting device according to claim 6 or 7, wherein: 9. A detection value storage means for preliminarily storing a value detected by the load detection means when an overload is detected by the overload detection means, and a detection value stored in the detection value storage means. When the overload is detected by the overload detection means during use of the elevator, the detected value is compared with a value detected by the load detection means, and when the difference between the two exceeds a predetermined value, the load is detected by the load detection means. A comparison / determination unit for determining that there is an abnormality; and a notification unit for notifying that the inspection and adjustment of the load detection unit is necessary when the comparison / determination unit determines that there is an abnormality. Item 9. The elevator overload detecting device according to any one of Items 3 to 8. 10. The difference between the detected value stored in said detected value storage means and a value detected by said load detection means when an overload is detected by said overload detection means during use of an elevator. The elevator overload detecting device according to claim 9, further comprising operation stop means for stopping the operation of the elevator when a value set to a value larger than the predetermined value is exceeded.