JP2005306557A - Adjustment device of elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adjustment device capable of carrying out balance adjustment of a counter weight without using a test weight. <P>SOLUTION: This adjustment device of an elevator precisely detects an electric current of an electric motor corresponding to a balance load from which in-tower loss is removed and computes the balance load from previously known characteristics of the electric motor by finding an average electric current of the electric motor at the time of upward driving and downward driving at constant speed in travelling in a no-load state. This conversion is carried out by using a table to convert a live load to the electric current. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an elevator adjusting device for simplifying elevator installation work, particularly counterweight overbalance adjustment work.

  In the case of a general elevator, as shown in FIG. 7, a car 2 is suspended on one side of the main rope 1 and a counterweight 3 is suspended on the other side, and the sheave 5 is rotated by the electric motor 4 to raise and lower the car 2. However, the weight of the counterweight 3 is determined in advance so as to be just balanced with the counterweight 3 at the time of the loaded load corresponding to half of the weight of the car 2 plus the rated load.

When determining the load, first load the test weight into the car 2 to obtain a substantially balanced state, then perform the ascending operation and the descending operation, and the motor current value (current detected at the speed detector) It has been proposed to calculate the difference of the detection weight by the detector 6 by the control circuit 7 and to confirm the exact weight of the counterweight 3. Here, 8 is a speed detector, and 9 is a power converter such as an inverter. (See Patent Document 1)
Japanese Patent No. 2502189

  However, even in this way, it is necessary to collect many test weights in the unit of 20 kg and bring them to the installation site in order to carry out the confirmation work after making a balanced and balanced state once. In addition, various expenses and labor are indispensable and extremely complicated.

  The present invention relates to an elevator apparatus comprising an electric motor for driving an elevator car, a sheave connected to the electric motor, and an elevator car and a counterweight suspended from the sheave via a main rope. An average current confirmation device is provided for outputting the average current of the motor during ascending operation and descending operation in constant speed running at the vehicle, and the car load is compared with the recommended current value based on the characteristics of the motor. A conversion device for converting to a load is provided.

  Since the present invention does not require any test weight to be brought to the site, and only electrical adjustment is required, it is completely free from complicated field work during installation adjustment.

  The present invention accurately detects the motor current corresponding to the balance load excluding the tower loss by obtaining the average current of the motor during the ascending operation and descending operation in constant speed running in a no-load state, The balance load is calculated from the known characteristics of the motor.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an overall configuration diagram showing an embodiment of the present invention. FIG. 2 is a load characteristic in which the vertical axis indicates the motor current I when the constant speed rises and falls at a constant speed, and the horizontal axis indicates the car load. Figure 3 shows the load characteristics of the motor in which the weights to be placed in the car in advance are loaded in units of 100 kilograms and the motor current at that time is plotted. Fig. 3 shows the recommended current value for the balance load created based on this load characteristic. FIG. 4 shows the conversion factor between the differential current value (difference between the balanced current I ₃ described later and the recommended current value described above) and the load load. The table is shown (the power supply voltage is divided into 200 V system and 400 V system). FIG. 5 is a flowchart for explaining the operation of the apparatus of the present invention.

In the figure, the same reference numerals as in FIG. 7 indicate the same thing, but 10 is the average of the motor current (in the vicinity where the car 2 and the counterweight 3 pass each other) when the car 2 is running at low speed when there is no load. An average current check device for calculating an average value I ₂ of the value I ₁ and the motor current during the low-speed descent operation (the vicinity where the car 2 and the counterweight 3 pass each other), 11 is a balanced current I ₃ = (I ₁ + I ₂ ) / 2, a comparison device 12 that compares the output I ₃ of the calculation device 11 with the recommended current value I ₀ (i _{1 to} i ₃₀ ) known from the table shown in FIG. 3, and outputs the difference 12a. , 13 is a conversion device for converting the weight of the adjustment weight corresponding to the output of the comparison device 12 from the conversion coefficient shown in FIG. 4, and indicates, for example, the excess / deficiency load for the current counterweight 3 by display.

Next, the operation of the device of the present invention will be described. First, as shown in FIG. 5, the car 2 is lifted at a low speed a plurality of times with no load, and the motor current is measured near the car 2 and the counterweight 3, and the average value I _{1 is obtained.} Ask for. Next, while the car 2 is in an unloaded state, the descent operation is performed several times at a low speed, the motor current in the vicinity where the car 2 and the counterweight 3 pass each other is measured, and the average value I ₂ is obtained. Then, I ₃ is calculated by the calculation device 11, and the balanced current is obtained in a form that cancels out the travel loss in the tower. Next, the comparison device 12 compares the recommended current value I ₀ and the balanced current I ₃ to obtain a difference, and this current difference is multiplied by a conversion coefficient K (K _{1 to} K ₈ ) that matches the elevator specifications to obtain a load load component. Convert to. This result is an overbalance load, that is, an excess / deficiency load of the counterweight. If this load is added to or deleted from the counterweight 3, the balance adjustment is completed.

  By the way, according to the experiment, an excess / deficiency balance load can be detected with an error of about ± 10 kilograms, so that almost sufficient accuracy can be obtained and a detection level that is practically satisfactory can be achieved.

In the above description, an example in which a table that stores recommended current values and converted numerical values is prepared in advance has been described. However, this may be calculated directly from Equation 1 below. That is, in the graph shown in FIG. 6, it may be calculated directly from the measured value at the site. That is, if it is grasped how much the load W intersecting with the horizontal axis in FIG. 6 deviates from the ideal load W ₀ , this means an excess / deficiency load. Here, the same reference numerals as those described above indicate the same, but the motor current I is expressed by Equation 1.
Formula 1

I = (W−W ₀ ) / K + (I ₃ −I ₀ ) = W ′ / K + (I ₃ −I ₀ )
Here, W ₀ is an ideal balance load according to the elevator specification, I ₃ is a measured calculation value, I ₀ (recommended current value: i _{1 to} i ₃₀ ), K (conversion factor: K _{1 to} K ₈ ) By substituting zero as the set value and obtaining the value of W ′, the excess / deficiency balance load can be calculated.

According to the present invention, since everything can be electrically processed, field work with good workability can be performed.

  As long as the electric motor according to the present invention is an electric motor that does not have a reduction gear, the present invention can be easily implemented even if it is a synchronous motor or a DC motor.

It is a whole block diagram which shows one Example of this invention. It is a figure which shows the load characteristic of the electric motor whose rated load of a cage | basket | car is 1000 kilograms. 6 is a table showing recommended current values created based on load characteristics. It is a table | surface table | surface which shows the conversion factor of a difference electric current value and a loading load. It is a flowchart figure for demonstrating operation | movement of this invention apparatus. It is a figure which shows the load characteristic of the electric motor in arbitrary sites. It is a block diagram which shows a prior art.

Explanation of symbols

2 Elevator car 3 Counterweight 4 Electric motor 10 Average current confirmation device 11 Calculation device 12 Comparison device 13 Conversion device

Claims (3)

In an elevator apparatus comprising an electric motor for driving an elevator car, a sheave connected to the electric motor, and the elevator car and a counterweight suspended in a shelving manner via a main rope to the sheave,
An average current confirmation device is provided for outputting the average current of the motor during ascending and descending operations at constant speed in a no-load state, and the output of the average current confirmation device is compared with the recommended current value from the characteristics of the motor. An elevator adjustment device comprising a conversion device for converting the load into the car load. The elevator adjustment apparatus according to claim 1, wherein the conversion device includes a table that converts a loaded load with respect to an electric current. The elevator adjustment device according to claim 1 or 2, wherein an output of the conversion device is displayed by a display device.

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