JP2011057319A - Elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To keep a ride comfort in a constantly comfortable state by properly correcting the load value to be detected by a load sensor in a car. <P>SOLUTION: An elevator control panel 6 starts the time measurement by a timer when the measured time by a timer A reaches the predetermined value, and a car 2 is stopped with its door closed, and turns on an offset correction starting switch when the measured time reaches the predetermined value. Then, the load signal is output from a load signal output unit as a door closure stand-by load signal. The elevator control panel 6 adds the differential value to the predetermined offset correction quantity if the differential value of the door closure stand-by load value indicated by the door closure stand-by load signal output from the load signal output unit subtracted from the non-loaded torque load signal conversion value stored in a load signal storage device 12 in advance is within a predetermined load displacement. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an elevator having an adjustment function of a load detection device that detects a load in a car.

  Conventionally, load control is performed by determining the load value in the car using a load sensor in the car based on the sinking amount of the vibration isolating rubber attached to the car frame of the car. Thus, if the load value detected by the car load sensor deviates from the actual load value, the car is lifted or dropped.

  As a method for preventing such lifting and hanging, it is conceivable that a maintenance person periodically corrects the deviation of the output value by the car load sensor. In addition, since it takes a lot of time and labor to make corrections by the maintenance staff themselves, as disclosed in Patent Document 1, for example, when the car is stopped for a certain period of time with the door closed. There are some that automatically determine the value of the load sensor in the car when it is determined that the car is not loaded.

  Furthermore, as disclosed in Patent Document 2, for example, by analyzing an image taken by a security camera in a car, the presence or absence of passengers or luggage in the car is recognized, and the car is loaded with no load and no load. In some cases, when the determination is made, the load detection value is automatically adjusted by the in-car load sensor.

JP 2004-277063 A JP 2008-137751 A

  In the method disclosed in Patent Document 1 described above, when the car is stopped for a certain period of time, it is assumed that the car is not loaded, but considering the case where luggage is placed in the car, It is difficult to reliably determine that the inside of the car is not loaded, and if the load detection value is corrected in a state where the car is not loaded, the ride comfort is worsened. Furthermore, since the initial value of correction is a load signal in a no-load state, if this initial value is abnormal, the abnormality is not improved even after correction.

  Further, the method disclosed in Patent Document 2 described above requires a complicated process of analyzing the presence / absence of loading in the car with a security camera. Moreover, it cannot be implemented in an elevator that does not have a security camera.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an elevator that can maintain a comfortable ride at all times by appropriately correcting a load value detected by a load sensor in a car.

  That is, the elevator according to the present invention includes a car that is wound around a sheave and connected to a counterweight via a rope and suspended, a hoist that rotates the sheave, and a load value of the car. A load detecting device for detecting; and a holding means for holding a non-loading torque load signal conversion value based on a torque command at zero speed when the car that has traveled in an unloaded state stops. The difference between the load value detected by the load detection device and the stored no-load torque load signal converted value is within a certain range when the car is closed and in a standby state for a predetermined time or more in a predetermined cycle. In this case, a correction means for correcting an offset amount of the load value of the car based on the difference is provided.

  According to the present invention, it is possible to always keep the ride comfort in a comfortable state by appropriately correcting the load value detected by the load sensor in the car.

The figure which shows the structural example of the elevator in the 1st Embodiment of this invention. The figure which shows an example of the normal driving | running | working waveform of an elevator. The figure for demonstrating the state of the load signal with respect to the loading state of an elevator. The block diagram which shows the structural example concerning the conversion from the detection voltage by the load sensor of an elevator to a load signal and a balance torque. The figure for demonstrating the state of the load signal with respect to the loading state of a passenger car when the vibration-proof rubber of an elevator deteriorates. The figure which shows an example of the driving | running | working waveform of an elevator when vibration-proof rubber deteriorates. The block diagram which shows the structural example which concerns on the offset amount correction | amendment of the elevator in the 1st Embodiment of this invention. The flowchart which shows an example of the processing operation which concerns on the offset amount correction | amendment of the elevator in the 1st Embodiment of this invention. The block diagram which shows the structural example which concerns on the offset amount correction | amendment of the elevator in the 2nd Embodiment of this invention. The flowchart which shows an example of the processing operation which concerns on the offset amount correction | amendment of the elevator in the 2nd Embodiment of this invention. The flowchart which shows an example of the processing operation for confirmation of the appropriateness of the offset amount correction amount by the elevator in the 3rd Embodiment of this invention. The figure which shows an example of the driving | running | working waveform which concerns on confirmation of the appropriateness of the offset amount correction amount by the elevator in the 3rd Embodiment of this invention. The flowchart which shows an example of the processing operation for confirmation of the appropriateness of the offset amount correction amount by the elevator in the 4th Embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
First, a first embodiment of the present invention will be described.
FIG. 1 is a diagram illustrating a configuration example of an elevator according to the first embodiment of the present invention.
The elevator includes a hoist 1, a car 2, a rope 3, a lifting weight 4, an anti-vibration rubber 5, an elevator control panel 6, a load sensor 7, an overload detection switch 8, a car frame 9, a tail cord 10, and a pulse. A generator 11 is provided.

  The car 2 is connected to a suspension weight 4 via a rope 3 wound around a sheave provided on the rotating shaft of the hoist 1. As the sheave is rotated by driving the hoist 1, the car 2 moves up and down in the hoistway together with the suspension weight 4 by the frictional force between the sheave and the rope 3.

The anti-vibration rubber 5 is installed on the floor side of the car between the car 2 and the car frame 9, and expands and contracts according to the loaded load in the car 2.
The load sensor 7 is installed between the car 2 and the car frame 9 on the floor side of the car 2 and is connected to the elevator control panel 6 via the tail cord 10. The load sensor 7 includes a differential transformer, a gap sensor, and the like, and outputs a voltage signal for calculating a load signal to the elevator control panel 6 via the tail cord 10 based on the amount of expansion and contraction of the vibration isolating rubber 5.

The pulse generator 11 is installed on the rotating shaft of the hoisting machine 1, detects the shaft rotation of the hoisting machine 1, and generates a number of pulse signals proportional to the rotational angle.
The elevator control panel 6 counts up and down the pulse signal generated by the pulse generator 11, detects the position in the hoistway of the car 2 based on the number of accumulated pulses obtained as a result of the count, and performs car position control. Do.

  A remote monitoring device 13 is installed at a maintenance center outside the elevator. The remote monitoring device 13 is connected to the elevator control panel 6 via a communication cable such as a LAN. The remote monitoring device 13 inputs elevator abnormality information issued from the elevator control panel 6. Thus, elevator abnormality information can be transmitted to maintenance personnel in the maintenance center.

  The elevator control panel 6 has a load signal storage device 12. The elevator control panel 6 obtains a load signal in the car 2 based on a signal from the load sensor 7, calculates a load value, and stores it in the load signal storage device 12.

The overload detection switch 8 is mounted between the car 2 and the car frame 9 on the floor side of the car 2 so that it operates when the load in the car 2 reaches 105% of the rated load. Switch. When the overload detection switch 8 is operated, this operation signal is output to the elevator control panel 6 via the tail cord 10.
When the elevator control panel 6 receives a signal from the overload detection switch 8, the elevator control panel 6 considers that the car 2 is full and waits for the door to open, or makes an announcement or the like prompting the user to get off by an alarm device (not shown). .

FIG. 2 is a diagram illustrating an example of a normal traveling waveform of the elevator. FIG. 2 shows waveforms of the car speed 14 and the torque command value 15 with the elapsed time from the start of travel of the car 2 to the stop.
A balance torque 16 that is a torque command value 15 at the start of traveling of the car 2 is suspended from the car 2 when the elevator control panel 6 releases the braking device of the hoist 1 when the car 2 starts to travel. This torque is used to prevent the car 2 from being lifted or dropped due to an imbalance due to a weight difference from the counterweight 4.
Further, the equilibrium torque 17 that is the torque command value 15 at the start of traveling of the car 2 is the torque at the zero speed when the car 2 stops, and the weight of the car 2 and the suspension weight 4 This is a torque for compensating for the difference.

FIG. 3 is a diagram for explaining the state of the load signal with respect to the loaded state of the elevator. FIG. 4 is a block diagram showing a configuration example relating to conversion from a voltage detected by a load sensor by a general elevator control panel to a load signal and a balance torque.
As shown in FIG. 4, a general elevator control panel includes a load sensor detection voltage output unit 23, an offset amount addition unit 24, a load signal conversion gain multiplication unit 25, a load signal output unit 26, a torque conversion gain multiplication unit 27, A car position compensation torque adding unit 28 and a balancing torque output unit 29 are provided.

The load sensor detection voltage 18 shown in FIG. 3 is a voltage detected by the load sensor 7 and output from the load sensor detection voltage output unit 23. The load sensor detection voltage 18 is converted into the voltage 20 after the offset amount addition shown in FIG. 3 by adding the offset amount 19 shown in FIG. 3 by the offset amount addition unit 24.
This offset amount 19 is an amount artificially adjusted so that the load sensor detection voltage 18 becomes a reference value when the load in the car 2 is BL (50% of the rated load).

The voltage 20 after the addition of the offset amount is multiplied by the load signal conversion gain 21 by the load signal conversion gain multiplication unit 25 to be converted into the load signal 22 shown in FIG. 3 and output by the load signal output unit 26. From this load signal 22, the weight difference between the car 2 and the suspension weight 4 is obtained.
The load signal conversion gain 21 is WT_NL (load signal representing the NL state) shown in FIG. 3 when NL (no load state), and WT_FL (FL state) shown in FIG. 3 when FL (100% of the rated load). Is a gain that has been artificially adjusted so that

Then, the load signal 22 from the load signal output unit 26 is converted by the torque conversion gain multiplication unit 27 into a torque necessary for balancing the car 2 and the suspension weight 4.
Further, this converted torque affects the car position compensation torque, that is, the car 2 and the suspension weight 4 based on the car position information obtained based on the detection result of the pulse generator 11. The torque for ignoring the weight difference of the rope 3 to be added by the car position compensation torque adding unit 28 becomes the balance torque 16 and is output by the balance torque output unit 29.

FIG. 5 is a diagram for explaining the state of the load signal with respect to the loaded state of the car when the vibration-proof rubber of the elevator is deteriorated.
When the anti-vibration rubber 5 is damaged due to aging or the like, the load signal 22 shown in FIG. 3 is displaced to the load signal 22a shown in FIG. In the load signal 22a, an inclination 30 which is an inclination of the initial load signal 22 with respect to the horizontal axis shown in FIG. 5, that is, the axis of the ratio of the load amount in the car to the maximum load amount, is generated as an offset amount deviation 19a. Is displaced to an inclination 30a.
Here, due to the characteristics of the vibration isolating rubber 5, the inclination 30a is an inclination that does not greatly deviate from the inclination 30 due to secular change, and it is assumed that the inclination 30≈the inclination 30a.

FIG. 6 is a diagram illustrating an example of a traveling waveform of the elevator when the vibration isolating rubber of the car is deteriorated.
The waveforms of the car speed 14 and the torque command value 15 shown in FIG. 6 are waveforms when the load signal is displaced from the initial load signal 22 to the load signal 22a as shown in FIG.
When the load signal is displaced, the balance torque 16 calculated from the load signal as described above is naturally not an appropriate value. In this case, as shown by the car speed 14 and the torque command value 15 in FIG. 6, the car 2 is lifted or dropped at the start of traveling, which adversely affects the riding comfort.

FIG. 7 is a block diagram illustrating a configuration example relating to the offset correction of the elevator according to the first embodiment of the present invention.
As shown in FIG. 7, the elevator control panel 6 of the elevator according to the first embodiment includes the load sensor detection voltage output unit 23, the offset amount addition unit 24, the load signal conversion gain multiplication unit 25, and the load signal shown in FIG. In addition to the output unit 26, the torque conversion gain multiplication unit 27, the car position compensation torque addition unit 28 and the balance torque output unit 29, and the load signal storage device 12 shown in FIG. 1, an offset correction start switch 31, an offset amount correction amount addition A unit 33, an equilibrium torque output unit 34, a torque conversion gain calculation unit 35, and an abnormality report unit 36.

FIG. 8 is a flowchart illustrating an example of a processing operation related to the offset correction of the elevator according to the first embodiment of the present invention.
The process shown in FIG. 8 is a process of automatically correcting a deviation 19a of the offset amount of the load signal when the anti-vibration rubber 5 is damaged due to aging or the like.
The elevator control panel 6 has a timer A and a timer B that measure a predetermined time. The offset correction start switch 31 is off in the initial state. First, the elevator control panel 6 starts time measurement by the timer A (step S1), the measured time reaches a predetermined time predetermined for the timer A (YES in step S2), and the car 2 is When the operation is stopped with the door closed (YES in step S3), time measurement by the timer B is started (step S4).

  The elevator control panel 6 turns on the offset correction start switch 31 when the time measured by the timer B reaches a predetermined time predetermined for the timer B (YES in step S5) (step S6). Then, the load signal 22a is output from the load signal output unit 26 as a door closing standby load signal.

  Here, the predetermined time of the measurement time by the timer A is, for example, 24 hours, and the predetermined time of the measurement time by the timer B is, for example, about 5 minutes. These predetermined times can be arbitrarily set. As described above, the measurement time by the timer B is set to about 5 minutes. When the car 2 is closed and stopped for about 5 minutes, there is no person in the car 2 and there is no load. This is because the possibility of the state is high, and the expansion / contraction state of the vibration-proof rubber 5 is considered to be in a stable state.

  The elevator control panel 6 subtracts the door closing standby load value indicated by the door closing standby load signal output from the load signal output unit 26 from the no-load torque load signal converted value stored in the load signal storage device 12. The calculated difference value ΔWT is calculated (step S7).

  The no load torque load signal converted value is obtained by outputting the balance torque 17 when the car 2 is not loaded and stops at the intermediate position of the hoistway by the balance torque output unit 34. The conversion gain calculation unit 35 calculates a torque conversion gain that is a gain for converting the load signal into torque.

  Since the balance torque 17 is a torque necessary for the balance between the car 2 and the suspension weight, if the no-load torque load signal converted value becomes equal to the door closing standby load value, the balance torque 16 becomes the balance torque. 17 can output an appropriate balance torque 16 when the braking device of the hoisting machine 1 is released when the car 2 starts to travel, thereby preventing the car 2 from being lifted or dropped. it can.

  The elevator load control panel 6 calculates the torque load signal converted value at the time of no-loading in advance. Specifically, after the above-described offset amount 19 and load signal conversion gain 21 have been artificially adjusted, the maintenance person confirms that the car 2 is not loaded, and the elevator control panel 6 performs elevator control. By outputting a no load torque load signal conversion value calculation command to the panel 6, the no load torque load signal conversion value is calculated. This command can be given to the elevator control panel 6 using a dedicated console, personal computer, or the like.

  If the difference value ΔWT obtained in the process of step S7 is ± ΔWT_MAX, that is, within a predetermined load displacement (NO in step S8), the elevator control panel 6 sets the difference value to a predetermined offset amount correction amount (WT_offset) 32. ΔWT is added by the offset amount correction amount adding unit 33 (step S9). This value is added to the sum of the output value from the load sensor detection voltage output unit 23 and the output value from the offset amount addition unit 24.

The predetermined load displacement ± ΔWT_MAX described above is a value determined by the rated load of the car 2, for example, 3% of the rated load of the car 2.
Also, the initial value of the offset amount correction amount (WT_offset) 32 is 0, and this difference is added and updated when there is a difference between the no-load torque load signal converted value and the door closing standby load value. The

  In other words, the offset amount correction amount (WT_offset) 32 is added to the load sensor detection voltage 18 output by the load sensor detection voltage output unit 23 by the offset amount correction amount addition unit 33, so that The offset amount shift 19a shown in FIG. 5, which is the offset amount of the load signal shifted due to the influence of the change, is corrected, and the torque load signal converted value at the time of unloading becomes equal to the load value at the time of door closing standby.

  On the other hand, when the difference value ΔWT does not fall within ± ΔWT_MAX (YES in step S8), the elevator control panel 6 determines that the waiting car 2 is not unloaded, and makes this determination a predetermined number of times. If not performed continuously (NO in step S11), the difference value ΔWT is not added to the offset amount correction amount (WT_offset) 32, and the measurement times by the timer A and timer B are cleared (step S10). The offset amount is not corrected until the next cycle.

  As described above, when it is determined that the difference value ΔWT does not fall within ± ΔWT_MAX for a predetermined number of times (YES in step S11), the elevator control panel 6 determines that the elevator itself is abnormal and the offset Without adding the difference value ΔWT to the amount correction amount (WT_offset) 32, an abnormality is reported by the abnormality reporting unit 36 (step S12), and elevator abnormality information is output to the remote monitoring device 13. After step S9 or S12, the process proceeds to step S10.

  The predetermined number of times described above can be arbitrarily set. In this way, when the difference value ΔWT does not fall within ± ΔWT_MAX for a predetermined number of times in succession, the baggage is accidentally placed in the car 2 during the predetermined time measurement by the timer B. Thus, it is possible to prevent abnormal reports from being frequently issued.

  As described above, the elevator according to the first embodiment of the present invention has the door closing standby load value indicated by the door closing standby load signal output from the load signal output unit 26 from the no-load torque load signal converted value. By subtracting the difference value as an offset amount correction amount, even if the offset amount of the load signal deviates from an appropriate value due to secular change of the anti-vibration rubber 5 in the car frame 9, it is automatically corrected. Can do. Further, since the comparison target with the load signal for correcting the offset amount is a load signal converted from the equilibrium torque 17 which is a torque necessary for balancing the car 2 and the suspension weight 4, it is appropriate. A load signal can be obtained and an appropriate balance torque 16 can be output. Therefore, the car 2 can be prevented from being lifted or dropped with high accuracy.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In addition, the description of the same part as what was shown in FIG. 1 among the structures of the elevator in each following embodiment is abbreviate | omitted.
FIG. 9 is a block diagram illustrating a configuration example relating to the offset correction of the elevator according to the second embodiment of the present invention.
As shown in FIG. 9, the elevator control panel 6 of the elevator according to the second embodiment of the present invention includes a hoistway intermediate position travel command unit 37, a door closing standby torque output unit in addition to the configuration shown in FIG. 7. 38, and an equilibrium torque storage device 39. The elevator control panel 6 includes a first abnormality reporting unit 41 and a second abnormality reporting unit 42 instead of the abnormality reporting unit 36 shown in FIG.

  In this embodiment, when the car 2 that has once entered the door-closed standby state travels to a predetermined position and stops, the equilibrium torque, which is a torque command at zero speed, and the car 2 when not loaded are stopped. The balance torque recorded in advance as a torque command value at zero speed is compared to determine whether the door closing standby state is a no-loading state. In this embodiment, the elevator control panel 6 further includes a load signal storage device 12a.

FIG. 10 is a flowchart illustrating an example of a processing operation related to the offset correction of the elevator according to the second embodiment of the present invention.
In the present embodiment, when the processing from steps S1 to S6 described in the first embodiment is performed and the offset correction start switch 31 is turned on, the load indicated by the load signal from the load signal output unit 26 is displayed. The value is stored in the load signal storage device 12a as a door closing standby load value.

  When the load signal from the load signal output unit 26 is input, the hoistway intermediate position travel command unit 37 outputs a hoistway intermediate position travel command for causing the car 2 to travel to the hoistway intermediate position (step S21).

  Thereby, the passenger car 2 travels to the intermediate position of the hoistway. The door closing standby equilibrium torque output unit 38 outputs an equilibrium torque 17 that is a torque command at zero speed when the car 2 stops at the intermediate position of the hoistway.

  The elevator control panel 6 is a difference obtained by subtracting the door closing standby equilibrium torque 17 output from the door closing standby torque output unit 38 from the no-load equilibrium torque 17 stored in advance in the equilibrium torque storage device 39. The value ΔTM is calculated (step S22).

  The elevator control panel 6 determines that the above-described difference value ΔTM is ± ΔTM_MAX, that is, if it does not fall within the predetermined torque displacement (YES in Step S23), the standby car is not loaded, and this If the determination has not been made continuously a predetermined number of times (NO in step S24), the measurement time by the timer A and timer B is cleared (step S10), and the offset amount correction is not performed until the next cycle.

  When the elevator control panel 6 continuously determines that the difference value ΔTM does not fall within ± ΔTM_MAX as described above (YES in step S24), the elevator car in the standby state is not loaded. Therefore, it is determined that the elevator itself is abnormal under a condition other than the above, and the first abnormality reporting unit 41 issues an abnormality without correcting the offset amount correction amount (WT_offset) 32 (step S25). As a result, the abnormality information is output to the remote monitoring device 13. After the process of step S25, the process proceeds to step S10.

  The predetermined number of times described above can be arbitrarily set. In this way, when the difference value ΔTM is not continuously within ± ΔTM_MAX for a predetermined number of times, an abnormal alarm is issued for the first time, so that the baggage happens to be placed in the car 2 at the time of the predetermined time measurement by the timer B. Thus, it is possible to prevent abnormal reports from being frequently issued.

  On the other hand, if the difference value ΔTM calculated in the process of step S22 is within ± ΔTM_MAX (NO in step S23), the elevator control panel 6 determines that the car 2 is in an unloaded state, and the first implementation Similarly to the embodiment, the difference value ΔWT obtained by subtracting the door load standby load value stored in the load signal storage device 12a as described above from the no-load torque load signal converted value stored in advance in the load signal storage device 12 is obtained. Calculation is performed (step S26).

  If the calculated difference value ΔWT is within ± ΔWT_MAX (NO in step S8), the elevator control panel 6 adds the difference value ΔWT to the offset amount correction amount (WT_offset) 32. The offset amount correction amount addition unit 33 adds this value to the load sensor detection voltage 18 output from the load sensor detection voltage output unit 23 by the offset amount correction amount addition unit 33 (step S9).

  This value is added to the sum of the output value from the load sensor detection voltage output unit 23 and the output value from the offset amount addition unit 24. As a result, the offset amount deviation 19a of the load signal shifted due to the secular change of the anti-vibration rubber 5 is corrected, and the no-load torque load signal converted value becomes equal to the standby load value.

  On the other hand, when the difference value ΔWT calculated in the process of step S26 does not fall within ± ΔWT_MAX (YES in step S8), the elevator control panel 6 loads under the condition that the waiting car is unloaded. It is determined that an abnormality has occurred in the sensor 7 or the transmission of the load signal, and the second abnormality notification unit 42 issues an abnormality without correcting the offset amount correction amount (WT_offset) 32 (step S27). As a result, the abnormality information is output to the remote monitoring device 13. After step S9 or S27, the process proceeds to step S10.

  As described above, the elevator according to the second embodiment of the present invention includes the torque command in the zero speed state when the car 2 travels from the door closing standby state and stops at the intermediate position of the hoistway, By comparing the torque command in the zero speed state when the vehicle is not loaded, it can be determined more reliably whether the car 2 is in the unloaded state. If the difference between the load value at the time of door closing and the time torque load signal converted value does not fall within a certain range, it can be determined that the load sensor 7 or load signal transmission is abnormal.

  Further, this elevator has a load value at the time of waiting for the door closed due to an abnormality in the load sensor 7 or the transmission of the load signal although the inside of the car 2 is not actually in the no-load state. Even in such a case, it is possible to accurately determine whether or not the car 2 is in the unloaded state by comparing the torque commands as described above. Therefore, it is possible to prevent unnecessary correction of the offset amount of the load signal.

(Third embodiment)
Next, a third embodiment of the present invention will be described.
In the third embodiment, in the elevator apparatus described in the first embodiment and the second embodiment, after the correction of the offset amount of the load signal, the passenger determines whether or not the correction result is appropriate. It is characterized by a function to check before use.

FIG. 11 is a flowchart illustrating an example of a processing operation for confirming the suitability of the offset amount correction amount by the elevator according to the third embodiment of the present invention.
FIG. 12 is a diagram illustrating an example of a traveling waveform related to confirmation of appropriateness of the offset correction amount by the elevator according to the third embodiment of the present invention.
In this embodiment, when the elevator control panel 6 confirms the update of the offset amount correction amount (WT_offset) 32 by the offset amount correction amount adding unit 33 (YES in step S31), the elevator control panel 6 outputs a travel command (step S32).

  When the elevator control panel 6 releases the braking device after the travel command is output (YES in step S33), the elevator control panel 6 does not operate until the predetermined time, that is, until the torque command amount change diagnosis time shown in FIG. (NO in S34), it is determined whether or not the amount of change in the torque command is within the predetermined abnormality detection threshold shown in FIG. 12 (step S36).

  Considering that the processing after step S31 is processing for determining whether the car 2 is lifted or dropped after correction of the offset amount, the car 2 depends on the amount of change in the torque command during acceleration. In order to prevent erroneous detection, the torque command amount change amount diagnosis time is set to a very short time, and is a time from when the braking device is released until the car 2 starts to move when the car 2 is not lifted or dropped. Things are desirable.

  The elevator control panel 6 is in a state where the change amount of the torque command is within the abnormality detection threshold (YES in Step S36), and when the above-described predetermined time has passed (YES in Step S34), the offset amount correction amount ( It is determined that the update of (WT_offset) 32 is normal (step S35). When the offset amount correction amount (WT_offset) 32 is updated again, the processing after step S32 is performed again.

On the other hand, the elevator control panel 6 updates the offset amount correction amount (WT_offset) 32 when the amount of change in the torque command does not fall within the abnormality detection threshold before the predetermined time elapses (YES in step S36). The subsequent counter torque 16 is not an appropriate value, and it is determined that the car 2 is lifted or dropped, and an abnormality is reported by the abnormality reporting unit 36 (step S37). Abnormal information is output.
Then, the elevator control panel 6 makes the update of the offset correction amount (WT_offset) 32 abnormal, and returns this value to the value before correction (step S38).

  The above-mentioned abnormality detection threshold value is obtained by converting the lifting or hanging of the car 2 into the amount of change in the torque command. Therefore, the abnormality detection threshold value indicates that the user feels the size of the lifting or hanging. It is desirable to set a value corresponding to the degree that can be achieved.

  As described above, in the elevator according to the third embodiment of the present invention, it is determined whether the correction result of the offset amount of the load signal is valid and whether the car 2 is lifted or dropped. Appropriate judgment can be made based on the amount. Therefore, even if the car 2 is lifted or dropped because the offset amount is corrected by mistake for some reason, this occurrence is detected before the elevator user actually uses the car 2. Thus, an abnormal alarm can be issued.

  Furthermore, when it is determined that the car 2 is lifted or dropped, the corrected offset amount can be returned to the value before correction, so that the user is not adversely affected. Complaints and the like regarding poor riding comfort due to the lifting or dropping of the car 2 can also be prevented.

  The determination as to whether the car 2 is lifted or dropped is not limited to the above-described change amount of the torque command, and may be performed using, for example, the change amount of the car speed 14. Good.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described.
In this embodiment, when the load signal offset amount correction amount exceeds a certain value, the abnormality reporting unit 36 performs abnormality reporting.

  In each embodiment described so far, the offset amount correction amount (WT_offset) 32 to be corrected at a certain period is for correcting the amount of sag due to secular change of the anti-vibration rubber 5, and is proportional to the amount of sag. It will increase.

  Lifting and hanging due to a balance torque abnormality due to a load signal shift can be prevented by offset amount correction. However, the overload detection switch 8 described in the first embodiment is mounted at a position that operates when the load of the car 2 is about 105% of the rated load during elevator installation and adjustment. The detection position of the overload detection switch 8 remains the same as when it is attached and does not change even after the offset amount is corrected.

  Therefore, if the amount of sag of the anti-vibration rubber 5 is further increased, even if the overload detection switch that needs to operate when the load value of the car 2 reaches about 105% of the rated load is less than 105%. Even if the car 2 is not full, the door 2 waits for the door to open and an announcement is made to prompt the user to get off.

  Conventionally, a maintenance person adjusts the mounting position of the overload detection switch 8 when it is found by the user's notification that the operation at the time of fullness is performed even though the car 2 is not full. However, the elevator operation must be stopped for this adjustment, which may cause complaints.

FIG. 13 is a flowchart illustrating an example of a processing operation for confirming the suitability of the offset amount correction amount by the elevator according to the fourth embodiment of the present invention.
In the present embodiment, when the offset amount correction amount (WT_offset) 32 exceeds the predetermined upper limit value WT_offset_max of the offset amount correction amount (YES in step S41), the elevator control panel 6 sags the vibration isolating rubber 5. It is determined that the overload detection switch 8 operates under a predetermined condition in which the passenger car 2 whose amount further increases is not full, and an abnormality is reported by the abnormality reporting unit 36 (step SS42), and the remote monitoring device 13 is notified. Abnormal information is output.

  The value of WT_offset_max can be arbitrarily set by the user. This value is, for example, an offset amount correction amount (WT_offset) that corrects the state of the sag amount due to the anti-vibration rubber 5 leaning to the extent that 75% of the rated load of the car 2 operates at full capacity. ) 32.

  As described above, the elevator according to the fourth embodiment of the present invention can notify the maintenance staff of the maintenance center that it is necessary to readjust the mounting position of the overload detection switch 8. Therefore, it can be readjusted by the maintenance staff at the mounting position of the overload detection switch 8 before giving the user unpleasant feeling.

  The present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be omitted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Hoisting machine, 2 ... Riding car, 3 ... Rope, 4 ... Suspension weight, 5 ... Anti-vibration rubber, 6 ... Control panel, 7 ... Load sensor, 8 ... Overload detection switch, 9 ... Car frame, 10 ... tail code, 11 ... pulse generator, 12, 12a ... load signal storage device, 13 ... remote monitoring device, 14 ... car speed, 15 ... torque command value, 16 ... balance torque, 17 ... balance torque, 18 ... load sensor detection Voltage, 19, 19a ... offset amount, 20 ... load signal voltage after offset amount addition, 21 ... load signal conversion gain, 22, 22a ... load signal, 23 ... load sensor detection voltage output unit, 24 ... offset amount addition unit, 25 ... Load signal conversion gain multiplication unit, 26 ... Load signal output unit, 27 ... Torque conversion gain multiplication unit, 28 ... Car position compensation torque addition unit, 29 ... Balance torque output unit, 31 ... Offset Correction start switch 32 ... offset amount correction amount (WT_offset) 33 ... offset amount correction amount addition unit 34 ... equilibrium torque output unit 35 ... torque conversion gain calculation unit 36 ... abnormality alarm unit 37 ... lift Road intermediate position travel command unit, 38... Balanced torque output unit during door closing standby, 39... Equilibrium torque storage device, 41... First abnormality reporting unit, 42.

Claims (5)

A car that is wrapped around a sheave and connected to a counterweight via a rope.
A hoist that rotates the sheave;
A load detection device for detecting a load value of the car;
Holding means for holding a no-load torque load signal converted value based on a torque command at zero speed when the car that has traveled in the no-load state is stopped;
In a case where the car is closed and waiting for a predetermined time or more in a predetermined cycle, the difference between the load value detected by the load detection device and the held no-load torque load signal converted value is within a certain range. An elevator comprising, in some cases, correction means for correcting an offset amount of the load value of the car based on the difference. The correction means includes
If the difference between the load value detected by the load detection device and the held no-load torque load signal converted value is not within a certain range, the offset amount is not corrected until the next cycle of the predetermined cycle,
An abnormality reporting means for issuing an abnormality when a difference between the load value detected by the load detection device and the held no-load torque load signal converted value is not within a certain range over a predetermined number of times in the predetermined period; The elevator according to claim 1 provided. A car that is wrapped around a sheave and connected to a counterweight via a rope.
A hoist that rotates the sheave;
A load detection device for detecting a load value of the car;
A load value holding means for holding a no-load torque load signal converted value based on a torque command at zero speed when the car that has traveled in the no-load state is stopped;
Torque command value holding means for holding a torque command value at zero speed when the car that has traveled in an unloaded state in the car stops;
Holds the torque command value at zero speed and the torque command value when the car is driven to a predetermined position and stopped at a predetermined period when the car is closed and waiting for a predetermined time or longer. The load value detected by the load detection device when the difference between the torque command values held by the means is within a certain range, and when the car has been closed and waited for the predetermined time or more by the load detection device, and the load value holding means. And a correction means for correcting an offset amount of the loaded load value of the car based on the difference when the difference from the stored torque load signal converted value at no load is within a certain value. Elevator. Torque command value at zero speed and the held torque command when the car is traveling to a predetermined position and stopped when the car is closed and waiting for a predetermined time or more in a predetermined cycle First anomaly reporting means for issuing an anomaly that the car is not unloaded when a difference in values is not within a certain number of times of the predetermined period;
Torque command value at zero speed and the held torque command when the car is traveling to a predetermined position and stopped when the car is closed and waiting for a predetermined time or more in a predetermined cycle A load value detected when the difference between the values is within a certain range, and when the car is closed and waited for the predetermined time or more by the load detection device, and the held no-load torque load signal converted value The elevator according to claim 3, further comprising: a second abnormality notification unit that performs abnormality detection of the detected load value when the difference between the two is not within a certain range. An overload detection device installed at a position that operates when a load of the car reaches a predetermined value exceeding a rated load;
Readjustment of the installation state of the overload detection device when the correction amount of the offset amount of the loaded load value of the car by the correction unit exceeds a predetermined value under the condition that the overload detection device does not operate. The elevator according to any one of claims 1 to 4, further comprising a notification means for performing a prompting notification.

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