JP4295067B2 - Elevator scale device characteristic measurement system - Google Patents

Description

  The present invention relates to an elevator balance device characteristic measurement system for measuring characteristics of a balance device that detects a load in an elevator car.

  Conventionally, when the operator switches to the load detection adjustment mode using the changeover switch provided on the operation panel in the car and the operator operates the landing button with no load in the car, the control device writes the output data of the load detector to the RAM. Next, the operator operates the operation button on the operation panel in the car and inputs the weight data of the worker, the control device writes the output data of the load detector in the RAM, and the gain coefficient and the data are obtained from these data. There is one that calculates load data of overload and writes it to the EEPROM together with load data of no load (see, for example, Patent Document 1).

JP 07-330245 A

  In the system for calculating the characteristics of the conventional elevator scale device as described above, it is necessary for an operator to get on and off the car instead of the weight, and the weight of one person is lighter than the rated load capacity of the car. There is a limit to the accuracy of the calculation results, and there are problems such as requiring a large number of people to increase the weight.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a system that can easily measure the characteristics of an elevator scale device without requiring any weight.

The present invention provides a load cell for measuring a tension for fixing the cab to a state where the cab is not moved, with one end attached to the elevator cab and the other end attached to the elevator pitch, and monitoring the output of the load cell. The car frame outside the room is pulled up by driving the hoisting motor, and a load corresponding to the load in the car room is applied to the weighing device for measuring the load in the car room provided between the car frame and the car room. An elevator balance device characteristic measurement system that measures the output characteristics of the scale device from the output of the scale device at that time, and calculates the output of the load cell corresponding to two or more different loads applied to the scale device. Based on the integrated value of the output difference, means for obtaining a difference between the calculated output and the output of the load cell. Means for driving the hoisting motor, means for storing the output from the weighing device when the output difference becomes zero, for each of the two or more different loads, and the two or more different loads Means for calculating an output characteristic of the scale device based on the output from the scale device stored in the elevator scale device characteristic measuring system .

  In this invention, without loading a test weight including a person in the cage, the same output is generated in the weighing device, and the output characteristics (gain and offset) of the weighing device are automatically detected, stored and controlled. It can be set in the panel, and measurement and adjustment of the output characteristics of the scale device can be easily performed without requiring labor.

Embodiment 1 FIG.
FIG. 1 is a diagram showing an example of the overall configuration of an elevator balance device characteristic measurement system according to the present invention. The sheave 1 moves an elevator car composed of a car frame 6 and a car room 7 up and down. The joint shaft 2 transmits the power from the hoisting motor 3 to the sheave 1. The main rope 4 is hung on the sheave 1 with both ends tied to an elevator car (6, 7) and a suspension weight 5. The scale devices 8a and 8b detect the load in the car, that is, the car room 7. The load cell 21 measures the tension, and one end is fixed to the pit floor by a fixing device 22 made of, for example, a wire rope. The A / D converter 20 performs analog / digital conversion of the signal.

  The control panel 12 shows the configuration of the entire control panel related to the elevator balance device characteristic measurement system of the present invention. The A / D converter 11 converts the analog signal output value (voltage value) of the scale devices 8a and 8b into a digital signal, and the scale value storage device 10 stores the values of the scale devices 8a and 8b, and the scale gain / offset. The calculation device 9 calculates the output characteristics of the scale devices 8a and 8b, and the overload detection device 9a detects an overload (overload) in the cab 7 described later. Further, the load data calculation device 19 is, for example, 50, 100, 110% of the rated load of the car input by the input device 30 (may be held as a fixed value if the rated load of the car does not change). And a signal indicating this is output, and the multiplier 18 multiplies the calculated signal by a constant K and outputs it. The comparator 18a compares the output of the multiplier 18 and the output of the A / D converter 20, and the zero detector 17 detects that the input signal from the comparator 18a has become 0 (zero), and holds it. The signal generator 16 sends a hold signal so as to store the scale value in the scale value storage device 10 at that timing. The integrator 15 integrates the output of the comparator 18a, the torque calculation device 14 calculates the corresponding torque based on the constant of the hoisting motor 3, and the inverter drive device 13 uses the output of the torque calculation device 14 as a basis. A voltage is applied to the hoisting motor 3 to generate torque.

  Next, the operation will be described. The elevator car frame 6 is suspended by the main rope 4 in balance with the suspension weight 5. The scale devices 8a and 8b are installed on the car frame 6, and the car room 7 is installed on the scale devices 8a and 8b. Therefore, the load in the car room 7 is detected by determining the amount of sinking of the car room 7 using the weighing devices 8a and 8b.

  When measuring the output characteristics of the elevator scale device, store the output value of the scale device when a load equivalent to 50% of the rated load is applied to the cab and the output value when a load equivalent to 100% is applied, The output characteristics (gain and offset) of the scale device are calculated. In the present invention, the car room 7 is fixed to a pit floor or the like using the load cell 21, and the output value of the load cell 21 is taken into the control panel 12 and monitored, and is 50%, 100%, 110% of the rated load capacity in the car. By generating a rising torque in the hoisting motor 3 until it becomes equal to the corresponding value, the load is applied to the weighing devices 8a and 8b without the operator getting on or off the car instead of the weight. To automatically calculate the output characteristics (gain and offset) of the scale device. The inside of the car means the inside of the car room 7.

The operation for setting the automatic weighing device is shown below.
(1) Store the scale value equivalent to 50% and the scale value equivalent to 100% First, as Step 1, the cab 7 is fixed to the pit floor using the fixing device 22. At this time, the load cell 21 is attached so that the tension of the fixing device 22 can be measured.
Next, as step 2, the output of the load cell 21 is taken into the elevator control panel 12 via the A / D converter 20.

  Next, as step 3, inside the control panel 12, the load data calculation device 19 calculates a load of 50%, 100%, and 110% with respect to the rated load capacity of the elevator, and then multiplies the constant K by the multiplier 18 and outputs it. Is done. Here, the fixed constant K is a normalization coefficient for matching the output voltage on the load cell 21 side, the conversion coefficient of the A / D converter 20 and the weighting per digital value.

Next, as Step 4, the output of the load cell 21 and the output of the load data calculation device 19 are compared by the comparator 18 a and the difference is input to the integrator 15. The output signal of the integrator 15 is converted into a torque value corresponding to a constant of the hoisting motor 3 by the torque calculating device 14 and output to the inverter driving device 13, and the inverter driving device 13 controls driving of the hoisting motor 3 according to this. To do. As a result, the hoisting motor 3 is supplied with power from the inverter driving device 13 and generates torque.
For example, when the rated load is 1000 kg and the load is 50%, a difference occurs until the output value of the load cell 21 corresponds to 500 kg, and the difference is integrated by the integrator 15. When the output value of the load cell 21 being monitored becomes equivalent to 500 kg, the difference from the output value via the multiplier 18 (multiplied by the constant K) from the load data calculation device 19 becomes 0, and the output of the integrator 15 The value is a constant value. As a result, the hoisting motor 3 is supplied with power via the motor torque calculating device 14 and the inverter driving device 13, and the torque generated by the hoisting motor 3 is equivalent to 50% of the rated load capacity.

Next, as step 5, the zero detecting device 17 detects that the difference between the load cell 21 side and the load data calculating device 19 side is zero, and the result is held in the scale storage device 10 via the hold signal generating device 16. It is sent as a signal, and the scale value at that time is stored in the scale storage device 10.
Next, as Step 6, Steps 3 to 5 are also automatically performed for a load equivalent to 100% of the rated load of the car. Thereby, a scale value equivalent to 50% and a scale value equivalent to 100% can be stored. The load data calculation device 19 receives, for example, a hold signal from the hold signal generation device 16 and switches load calculation such as 50% or 100% based on the hold signal.

(2) Automatic calculation of output characteristics (gain and offset) of scale device The automatic calculation method will be described with reference to FIG. FIG. 2 is a graph showing the relationship between the output voltages of the scale devices 8a and 8b with respect to the load in the car, which is the load in the car room 7. The vertical axis 23 is the scale device output voltage, the horizontal axis 28 is the car load, and the relationship between the car load and the scale device output voltage is shown by a straight line 27. Reference numeral 31 denotes the car room 7, that is, when the car is unloaded, reference numeral 24 is the car load corresponding to 50%, reference numeral 25 is the car load equivalent to 100%, and reference numeral 26 is a car load 110 described later. It shows the balance device output voltage at the time equivalent to%.

  As shown in FIG. 2, the output voltage of the scale device increases in proportion to the increase in the car load. Therefore, the inclination of the straight line 27 becomes the scale device gain 29. Further, the output voltage value of the scale device indicated by reference numeral 31 when the car is unloaded (0% load) is the offset value of the scale device indicated by reference numeral 31a. That is,

Weighing device gain (Change amount of weigher output voltage per 1% load in car)
= {(Balance device output voltage at 100% load)-(50% load balance device output voltage)} / 50

Can be calculated by

  Weighing device offset = (50% load weighing device output voltage)-(Weighing device gain) x 50

Can be calculated.

  As described above, when scale values corresponding to 50% and 100% of the rated load capacity are stored in the scale storage device 10, the scale gain / offset calculation device 9 obtains the gain and offset of the scale device by the above calculation. These are done automatically.

(3) Confirmation of overload When the load data calculation device 19 calculates and outputs a load of 110% in addition to a load of 50% and 100% of the rated load capacity, the hoisting motor 3 has a torque equivalent to 110%. And the scale devices 8a and 8b generate an output equivalent to the case where a load equivalent to 110% is loaded in the car. At this time, it is automatically confirmed that an overload is detected in the existing control system of the control panel 12. For example, the overload detection device 9a of a part of the existing control system of the control panel 12 exceeds the reference scale value when the load in the car is equivalent to 100% of the rated load capacity, and the scale value from the scale devices 8a and 8b exceeds. To detect overload.

  The scale gain / offset calculating device 9, the overload detecting device 9 a, the hold signal generating device 16, the zero detecting device 17, the load data calculating device 19, the multiplier 18, the comparator 18 a, and the torque calculating device 14 in the control panel 12. The part comprising the integrator 15 may be constituted by a computer that operates according to a program. FIG. 3 shows an operation flowchart of an example relating to automatic detection / storage of a scale value for a load corresponding to 50% described in the above item (1). In step S101, 50% load automatic balance device adjustment (actually automatic detection and storage, the same applies hereinafter) is started. Here, the automatic weighing device adjustment means that the weighing device is adjusted by correcting the setting of internal information relating to the weighing device by detecting and storing the output characteristics of the weighing device in the control panel 12. Next, in step S102, the signal of the load cell 21 via the A / D converter 20 is input to the control panel 12 side and monitored. In step S103, the output signals of the scale devices 8a and 8b are input. In step S104, the load data calculation device 19 calculates a load value corresponding to a 50% load. Next, a difference between the load cell 21 side and the load data calculating device 19 side is calculated in step S105, and if the difference is 0 (zero) in step S106, a hold signal (50% hold signal for 50% load) is determined in step S107. ) Is turned on.

  Next, in step S108, an integrated value of the difference is obtained by adding the difference for each program processing (in a predetermined cycle). After the integrated value is converted into a torque command value of the hoisting motor 3 in step S109, the inverter is driven. Output to the device 13. Next, when the 50% hold signal is turned on in step S107 in steps S110 and S111, the signals of the scale devices 8a and 8b are stored in the scale storage device 10. Next, in step S112, the 50% hold signal is turned off. In step S113, if the scale value at 50% load has been stored (set), the 50% load automatic weighing device adjustment process is completed in step S114. To do. The operation related to the detection and storage of the scale value for the load equivalent to 100% (automatic scale adjustment) is performed in the same procedure.

  FIG. 4 shows an example of an operation flowchart regarding calculation (automatic adjustment) of output characteristics (gain and offset) of the weighing apparatus described in the above item (2). In step S201, calculation of the scale device gain and offset is started. If the setting (storing) of the weighing device output signal at the time of the load corresponding to the 50% and 100% loads described above is completed in step S202, the weighing device output is performed according to the calculation formula described earlier in steps S203 and S204. The scale device output signal gain and offset, that is, the scale device gain and offset are calculated from the signal, and the process is completed in step S205.

  With the above process, the equivalent output is generated in the weighing device without loading the test weight including people in the cage, and the output characteristics (gain and offset) of the weighing device are automatically detected and stored. It becomes possible to set in the control panel, and the measurement and adjustment of the output characteristics of the scale device can be easily performed without requiring labor.

It is a figure which shows an example of the whole structure of the elevator balance apparatus characteristic measurement system by this invention. It is a figure which shows the relationship of the output voltage of the scale apparatus with respect to the load in a cage | basket | car which is a load in a cage | basket | car room. It is a figure which shows an example of the operation | movement flowchart regarding the automatic detection and the memory | storage of the balance value with respect to the load equivalent to 50% of the rated load in a cage in the elevator balance apparatus characteristic measurement system by this invention. It is a figure which shows an example of the operation | movement flowchart regarding calculation (automatic adjustment) of the output characteristic (gain and offset) of the balance apparatus in the elevator balance apparatus characteristic measurement system by this invention.

Explanation of symbols

  1 sheave, 2 joint shaft, 3 hoisting motor, 4 main rope, 5 lifting weight, 6 car frame, 7 car room, 8a, 8b weighing device, 9 weighing gain / offset calculating device, 9a overload detecting device, 10 scale storage device, 11, 20 A / D converter, 12 control panel, 13 inverter drive device, 14 torque calculation device, 15 integrator, 16 hold signal generator, 17 zero detection device, 18 multiplier, 18a comparison 19 load data calculation device, 21 load cell, 22 fixing device, 30 input device.

Claims (4)

There is a load cell that measures the tension that is fixed to the elevator car cage with one end attached to the elevator car pitch and the other end is fixed at the elevator pitch, and the output of the load cell is monitored while the load cell is monitored. The car frame is driven upward by driving the hoisting motor, and a load corresponding to the load in the car room is applied to the weighing device for measuring the load in the car room provided between the car frame and the car room. An elevator scale device characteristic measurement system for measuring the output characteristics of the scale device from the output of the scale device ,
Means for calculating and sequentially outputting the output of the load cell corresponding to two or more different loads applied to the scale device;
Means for obtaining a difference between the calculated output and the output of the load cell;
Means for driving the hoisting motor based on the integrated value of the output difference;
Means for storing the output from the scale device when the output difference becomes zero for each of the two or more different loads;
Means for calculating an output characteristic of the scale device based on the output from the scale device stored for the two or more different loads;
An elevator balance device characteristic measurement system comprising: Claim means for calculating the output characteristic, and calculates the gain and offset of the weighing device based on the respective outputs from the weighing device obtained for the two or more different loads 1 The elevator balance device characteristic measurement system described in 1. The elevator balance device characteristic measurement according to claim 1 or 2 , wherein two or more different loads applied to the scale device are equivalent to 50% and 100% of the rated load capacity of the cab. system. 4. The elevator balance device characteristic measurement system according to claim 3 , further comprising means for applying a load exceeding the rated load capacity of the cab to the balance device to confirm overload detection.

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