JP2013154994A - Load detection device of elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a load detection device of an elevator which can carry out load detection taking effect of aging deterioration or the like into consideration.SOLUTION: A load detection device of an elevator includes: a load detection part 10 which detects a load on a rope hitch part for mounting and fixing one end of a main rope for hanging a car; a storage part 15 which stores a load value detected by the load detection part 10; a load operating part 18 which operates first load output characteristics of the load detection part from car position information and load value information in an initial state of the elevator; and a corrected value operating part 17 which operates second load output characteristics of the load detection part from car position information and load value information in a predetermined period of the elevator, operates a corrected value for correcting the first load output characteristics to an appropriate value, and outputs the corrected value to the load operating part.

Description

  Embodiments described herein relate generally to an elevator load detection device having an automatic adjustment function of an elevator detection load.

  In an elevator equipped with a load detection device in a rope hitch and having a function of detecting a car load, a change appears in the load detection characteristics due to the season and aging deterioration.

  In the conventional load detection device, in order to solve the above-mentioned problem, a worker or the like periodically brings a weight into the car and raises and lowers the car, and compares the weight of the weight brought in and a detection signal from the load detection device. Thus, the load detection characteristic is calculated to determine whether or not the detected value is correct. And, if necessary, work to adjust the load detection characteristics has occurred.

JP 7-330245 A

  As described above, in the conventional load detection device, it is necessary for an operator to regularly check the load detection characteristics using a weight, which takes time and effort.

  Therefore, an embodiment of the present invention aims to provide an elevator load detection device that can automatically adjust the detection accuracy of the load detection function and can perform load detection in consideration of the influence of aging degradation and the like. To do.

  In order to achieve the above object, an elevator load detection device according to an embodiment of the present invention includes a load detection unit that detects a load applied to a rope hitch unit that attaches and fixes one end of a main rope that suspends a car, and The first load detection unit includes a storage unit that stores a load value detected by the load detection unit, a car control unit that controls the operation of the car, and car position information and load value information in an initial state of the elevator. A load calculation unit for calculating the load output characteristic of the vehicle, a second load output characteristic of the load detection unit from the car position information and the load value information at a predetermined time of the elevator, and calculating the first load output characteristic. And a correction value calculation unit that calculates a correction value for correcting to an appropriate value and outputs the correction value to the load calculation unit.

It is a schematic diagram which shows attachment of the load detection apparatus of the elevator which concerns on the 1st Embodiment of this invention. It is a mimetic diagram showing composition of an elevator load detection device concerning a 1st embodiment of the present invention. (A) It is an output characteristic figure which shows the relationship between the load in a cage | basket | car, and the output voltage by a load detection apparatus. (B) It is an output characteristic figure which shows the relationship of the output voltage by the influence of the rope load with respect to the change of a cage position. It is a flowchart which shows the calculation procedure of the output characteristic by the load detection apparatus which concerns on the 1st Embodiment of this invention. It is a schematic diagram which shows the structure of the load detection apparatus of the elevator which concerns on the 2nd Embodiment of this invention. It is a flowchart which shows the abnormality determination process of the load detection apparatus which concerns on the 2nd Embodiment of this invention.

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

(First embodiment)
FIG. 1 is a schematic view showing attachment of an elevator load detection device according to a first embodiment of the present invention. FIG. 2 is a schematic diagram showing the configuration of the load detector according to the first embodiment of the present invention. FIG. 3A is an output characteristic diagram showing the relationship between the load in the car and the output voltage by the load detection device. FIG. 3B is an output characteristic diagram showing the relationship of the output voltage due to the influence of the rope load on the change in the car position. FIG. 4 is a flowchart showing a procedure for calculating output characteristics by the load detection device according to the first embodiment of the present invention.

  First, the basic configuration of the elevator according to the first embodiment of the present invention will be described with reference to FIG. A main rope 3 is wound around a drive sheave 2 attached to the hoist 1. Both ends of the main rope 3 are fixed to hitch portions 5a and 5b provided in a machine bed 4 installed at an upper portion of a hoistway (not shown). The car 6 is suspended by a car sheave 7 and the counterweight 8 is suspended by a 2: 1 roping system via a support sheave 9.

  The rope hitch 5a is provided with a load detector 10 for measuring the car load. In this embodiment, a load cell is used as the load detection device, and the load detection unit 10 is configured to output a voltage corresponding to the load related to the load detection unit 10. That is, the load detection unit 10 detects an output voltage corresponding to the load. Further, the hoisting machine 1 is provided with a rotation angle detecting unit 11 for detecting the rotation angle of the hoisting machine 1.

  Thus, by suspending the car 6 and the counter weight 8 on the main rope 3, the car 6, the counter weight 8 and the main rope 3 move to the positional relationship between the solid line and the dotted line shown in FIG.

  Next, the configuration of the load detection device according to the present embodiment will be described with reference to FIG.

  First, as a basic configuration, a car control unit 12 that controls the car 6 is connected to the hoist 1. Further, the hoisting machine 1 is provided with a rotation angle detection unit 11 for detecting the rotation angle of the hoisting machine 1. The rotation angle detection unit 11 is connected to a car position / speed detection unit 13 that detects a car position and a car speed from the rotation angle of the hoist 1 detected by the rotation angle detection unit 11.

  Further, the car 6 is normally controlled by including a speed command unit 14 that outputs a speed command to the car control unit 12 according to the car position and the car speed detected by the car position / speed detection unit 13. .

  In the present embodiment, in addition to the above configuration, the storage unit 15 that receives a signal from the load detection unit 10 and stores received data is provided. In addition, the storage unit 15 can switch the connection destination to the correction value calculation unit 17 or the load calculation unit 18 by the switching unit 16. During normal operation of the elevator, the storage unit 15 is connected to the load calculation unit 18, and the load calculation unit 18 is connected to the car 6 based on the output voltage detected by the load detection unit 10 stored in the storage unit 15. Calculate the load capacity inside. The switching unit 16 may be a timer that switches connection when a predetermined time is reached, or may be a switch that an operator or the like can arbitrarily switch.

  As shown in FIG. 3A, the storage unit 15 is preliminarily defined with load output characteristics indicating the relationship between the load applied to the hitch unit 5 and the output voltage of the load detection unit 10 when the elevator is installed. Further, as shown in FIG. 3B, the load on the main rope 3 for suspending the car increases as the car descends from the uppermost floor toward the lowermost floor. The load output characteristics will be described below.

  In the graph shown in FIG. 3A, the load value applied to the hitch unit 5 is shown on the horizontal axis, and the output voltage value of the load detection unit 10 is shown on the vertical axis. The output voltage of the load detection unit 10 increases as the load applied to the hitch unit 5 increases. As shown in FIG. 3A, in the present embodiment, the output voltage value of the load detection unit 10 at the time of NL (NoLoad) and FL (FullLoad) on the uppermost floor and the lowermost floor is measured in advance. A characteristic straight line is created by interval measurement. Here, the calculation will be described assuming that a predetermined load output characteristic is the load output characteristic A.

The load output characteristic A indicates a load output characteristic in an initial state such as when an elevator is installed. First, the car 6 is moved to the top floor in the NL state. After moving to the top floor, the load output value (V ₁ ) at the top floor is measured by NL. The measured load output value (V ₁ ) is stored in the storage unit 15. Next, on the top floor, a weight having a predetermined weight (N) is brought into the car 6 by an operator's hand. Thereafter, the load output value (V ₂ ) on the top floor when the weight is loaded is measured.

Then, the load output characteristic A is calculated by the following formula 1.

  In this way, the load output characteristic A in the initial state such as when the elevator is installed is calculated. Although the case of the top floor has been described here, a characteristic straight line is created by the same procedure on the bottom floor as shown in FIG. Note that the value of the load output characteristic A does not change whether it is the top floor or the bottom floor.

  That is, the load output characteristic refers to the relationship between the load applied to the hitch unit 5 on the uppermost floor and the lowermost floor and the output voltage of the load detection unit 10. This load output characteristic changes in value due to aged deterioration of the main rope 3 or the like. For example, the load load in the car may not be an accurate value due to detection of an output voltage larger than the actual load due to deterioration over time. That is, unless the value of the output characteristic is regularly adjusted, a situation occurs in which the actual load and the value of the load detected by the load detection unit 10 are different. Therefore, it is necessary to adjust the load detection accuracy in order to cope with a change in the detection value of the load detection unit 10 due to a cause such as aging deterioration.

  In this regard, a person has conventionally adjusted the load change using a weight. However, in this embodiment, instead of the operation of adjusting the load detection accuracy using a weight by an operator or the like, the load on the main rope 3 is adjusted. The operation for adjusting the load detection accuracy used will be described.

  Returning to FIG. 2, the correction value calculation unit 17 is connected to the car control unit 12. The correction value calculation unit 17 corrects the load output characteristic to a value corresponding to aged deterioration based on the data output from the storage unit 15 when the load detection accuracy adjustment operation is performed by the car control unit 12. The correction value J is calculated. The correction value calculation unit 17 outputs the calculated correction value J to the load calculation unit 18. When the adjustment operation is performed, the connection destination with the storage unit 15 is switched from the load calculation unit 18 to the correction value calculation unit 17.

  The load calculation unit 18 uses the predetermined load output characteristic A and the correction value J calculated by the correction calculation unit 17 to calculate a load value suitable for the current situation affected by aging degradation or the like. Calculate. That is, even when the main rope or the like is affected by aging, the load detection accuracy can be adjusted to the current state, and the actual load on the car 6 and the load detected by the load detector 10 can be adjusted. Can be minimized.

  Hereinafter, the adjustment operation of the load detection accuracy of the elevator load detection device according to the present embodiment will be described using the flowchart of FIG. 4. Here, the load output characteristic E at the time of adjustment is calculated first. According to the present embodiment, when the load output characteristic E is calculated and the load detection accuracy is adjusted, it is not adjusted using a weight as in the conventional case, but is accompanied by the raising and lowering of the car 6. It is characterized by using a load change amount corresponding to the movement of the main rope 3. This will be specifically described below.

  In order to adjust the load detection accuracy, first, it is confirmed that there are no passengers or luggage in the car 6, that is, the NL (NoLoad) state (S1). After confirming that the vehicle is in the NL state (YES in S1), the car control unit 12 controls the hoist 1 to move the car 6 to the top floor (S2).

After moving to the top floor, the load detection unit 10 measures the load output value (V ₃ ) on the top floor with NL (S3). The measured load output value (V ₃ ) is stored in the storage unit 15 (S4). At this time, the car control unit 12 compares the measured load output value (V ₃ ) with the load output value (V ₁ ) at the time of NL on the top floor measured in advance in the initial state of the elevator, and the difference is It is determined whether it is within a predetermined range (S5).

  If the car control unit 12 determines that the difference exceeds a predetermined range (NO in S5), an abnormality is reported as an abnormality in the load detection unit 10 (S6). When an abnormal report is issued, it is necessary to determine that the load detection device itself is abnormal and to perform detection accuracy adjustment work for the load detection device by an operator or the like. On the other hand, when it is determined that the difference is within the predetermined range (YES in S5), the car control unit 12 lowers the car 6 by Hm (S7).

After the car 6 is lowered by Hm and stopped, the load detector 10 measures the load output value (V ₄ ) at the stop position (S8). The measured load output value (V ₄ ) is stored in the storage unit 15 (S9). At this time, the car control unit 12 compares the measured load output value (V ₄ ) with the load output value (V ₂ ) at the top floor when the weight previously measured in the initial state of the elevator is loaded, It is determined whether or not the difference is within a predetermined range (S10).

  When the car control unit 12 determines that the difference exceeds a predetermined range (NO in S10), an abnormality is reported as an abnormality in the load detection unit 10 (S6). When an abnormal report is issued, it is necessary to determine that the load detection device itself is abnormal and to perform detection accuracy adjustment work for the load detection device by an operator or the like. On the other hand, when it is determined that the difference is within the predetermined range (YES in S10), the correction value calculation unit 17 loads the load value (G) corresponding to the displacement of the main rope 3 due to the car 6 being lowered by Hm. Is calculated (S11).

  Here, the load per unit of the main rope 3 is stored in the storage unit 15 in advance, and the displacement load (G) of the main rope 3 due to the Hm descending is the same as the weight of the loaded weight. Like that. That is, the correction value calculation unit 17 calculates a load value (G) corresponding to the displacement of the main rope 3 when the car 6 is lowered by Hm.

Then, the load output characteristic E is calculated by the following formula 2 (S12).

  As described above, the characteristic in the initial state such as when the elevator is installed, that is, the load output characteristic A is calculated by Expression 1, and the characteristic in the adjustment of the load detection accuracy of the elevator load detection device, that is, the load output characteristic E is calculated by Expression 2. To do.

And the correction value J is calculated from these load output characteristics A and load output characteristics E by the following formula 3 (S13).

The load detection device in the elevator according to the present embodiment uses the correction value J, so that even if there is an effect of deterioration over time, the actual load value on the car 6 and the load detection unit. The deviation of the value of the detected load due to 10 can be suppressed to the minimum, and an accurate loading load on the car 6 can be detected. Specifically, the boarding load D is calculated by the following expression 4 (S14).

  The “output voltage V” in the above equation 4 is an output voltage currently detected by the load detection unit 10. The “load output characteristic A” is a value indicating a relationship between a load applied to the hitch unit 5 and an output voltage detected by the load detection unit 10, which is predetermined in an initial state such as when an elevator is installed as described above. It is. The detected load value in the initial state can be calculated from the output voltage V and the load output characteristic A here. By multiplying this value by the correction value J, the load detection accuracy can be adjusted to the current state in consideration of aging deterioration, and the deviation between the actual boarding load and the detected load can be minimized.

(Second Embodiment)
Next, a second embodiment will be described. FIG. 5 is a schematic diagram showing the configuration of an elevator load detection device according to the second embodiment of the present invention. FIG. 6 is a flowchart showing an abnormality determination process of the load detection device according to the second embodiment of the present invention.

  In the present embodiment, it is possible to determine whether there is an abnormality in the output voltage detected by the load detection unit 10 with reference to the ambient temperature of the load detection unit 10 detected by the temperature detection unit 19.

  As shown in FIG. 5, the elevator load detection device according to this embodiment includes a temperature detection unit 19 in addition to the configuration of the first embodiment. Further, a comparison / determination unit 20 that determines whether or not an abnormality has occurred in the load detection unit 10 from the ambient temperature detected by the temperature detection unit 19 and the correction value calculated by the correction value calculation unit 17 is provided. The temperature detection unit 19 and the comparison determination unit 20 are connected to the storage unit 15.

  This is because when the ambient temperature of the load detection unit 10 increases, the steel material constituting the load detection unit 10 softens, and the strain amount of the load detection unit 10 increases compared to before the ambient temperature increase, resulting in an output voltage value. Is to take advantage of the higher. Conversely, when the ambient temperature of the load detection unit 10 is lowered, the steel material constituting the load detection unit 10 is hardened and the strain amount of the load detection unit 10 is reduced as compared with before the ambient temperature is lowered. As a result, the output voltage value is reduced. It takes advantage of lowering.

  Hereinafter, the abnormality determination process of the load detection unit 10 in the present embodiment will be described using the flowchart of FIG.

  First, when the adjustment operation of the detection accuracy of the load detection device is performed, the ambient temperature of the current load detection unit 10 is measured by the temperature detection unit 19 (S21). And the measurement result is output to the memory | storage part 15 (S22).

  Here, as in the case of calculating the load output characteristic E described in the first embodiment, the load output value at NL when the car 6 is stopped on the top floor is measured, The measured load output value is stored in the storage unit 15. Further, after the car 6 is lowered by Hm and stopped, the load detection unit 10 measures the load output value at the stop position, and the measured load output value is stored in the storage unit 15.

  When the detection accuracy of the load detection device is adjusted again after a predetermined time has elapsed, the car 6 is lowered by Hm from the top floor and stopped again at NL (S23). After stopping, a load output value is measured by the load detection unit 10 (S24). The load detection unit 10 outputs the measured load output value to the storage unit 15 (S25).

  Thereafter, the comparison / determination unit 20 obtains the ambient temperature of the load detection unit 10 and the load output value when the car 6 is lowered by Hm when the detection accuracy adjustment operation of the previous load detection device is performed from the storage unit 15. Receive (S26). Furthermore, the comparison / determination unit 20 calculates the ambient temperature of the load detection unit 10 and the load output value when the car 6 is lowered by Hm when the detection accuracy of the current load detection device is adjusted from the storage unit 15. Is received (S27).

  Then, the comparison / determination unit 20 compares the ambient temperature of the load detection unit 10 measured last time with the ambient temperature of the load detection unit 10 measured this time (S28). Further, the comparison / determination unit 20 compares the load output value when the car 6 measured last time is lowered by Hm with the load output value when the car 6 measured this time is lowered by Hm (S29, S30). .

  First, as a result of comparison, the case where the current ambient temperature is higher than the previous time will be described (YES in S28). If the ambient temperature is high and the load detection value is also higher this time (YES in S29), it is determined that there is no abnormality in the load detection device (S31). On the other hand, if the ambient temperature is high and the load detection value is lower this time (NO in S29), it is determined that an abnormality has occurred in the load detection device (S32).

  Next, as a result of comparison, the case where the current ambient temperature is lower than the previous time will be described (NO in S28). If the ambient temperature is low and the load detection value is lower this time (YES in S30), it is determined that there is no abnormality in the load detection device (S31). On the other hand, if the ambient temperature is low and the load detection value is higher this time (NO in S30), it is determined that an abnormality has occurred in the load detection device (S32).

  As described above, the temperature detection unit 19 that measures the ambient temperature of the load detection unit 10 is provided, and by comparing and determining the relationship between the measured ambient temperature and the load detection value, an abnormality of the load detection device is generated. The presence or absence can be determined.

DESCRIPTION OF SYMBOLS 1 ... Hoisting machine 2 ... Drive sheave 3 ... Main rope 4 ... Machine bed 5 ... Hitch part 6 ... Car 7 ... Car sheave 8 ... Counterweight 9 ... Support sheave 10 ... Load detection part 11 ... Rotation angle detection part 12 Car control unit 13 Car position / speed detection unit 14 Speed command unit 15 Storage unit 16 Switching unit 17 Correction value calculation unit 18 Load calculation unit 19 Temperature detection unit 20 Comparison determination unit

Claims (3)

A load detection unit that detects a load applied to a rope hitch portion that attaches and fixes one end of the main rope that suspends the car; and
A storage unit for storing a load value detected by the load detection unit;
A car control unit for controlling the operation of the car;
A load calculation unit that calculates a first load output characteristic of the load detection unit from car position information and load value information in an initial state of the elevator;
A second load output characteristic of the load detection unit is calculated from car position information and load value information at a predetermined time of the elevator, and a correction value for correcting the first load output characteristic to an appropriate value is calculated. A correction value calculation unit that outputs the correction value to the load calculation unit;
An elevator load detection device comprising: A temperature detector that measures the ambient temperature of the load detector; and
Comparing the load value detected by the load detection unit and the ambient temperature measured by the temperature detection unit with the load value measured last time and the ambient temperature to determine whether there is an abnormality in the load detection unit A determination unit;
The elevator load detection device according to claim 1, further comprising:   2. The elevator according to claim 1, further comprising a reporting unit that issues an abnormality to the outside when the correction value calculated by the correction value calculation unit exceeds a predetermined threshold value. Load detection device.

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