JP2004168434A - Readjustment method of weighing device for elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform readjustment work for the output characteristics of a weighing device (linear former) without using a test weight. <P>SOLUTION: Though the readjustment is conventionally performed by using a test weight without considering how the characteristics A0 its early stages of installation changes with time, this invention looks upon the present characteristics A1 as one obtained by moving the characteristics A0 in parallel. When the output voltage of 1.9 V of the linear former at the load of 0 % is detected, the characteristics A1 can be returned to the characteristics A0 by matching this voltage to 2.1V by adjusting the variable resistance. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a readjustment method of an elevator weighing device for readjusting output characteristics of a linear former used as a weighing device for detecting a load in an elevator car.
[0002]
[Prior art]
FIG. 3 is an explanatory diagram schematically showing a general configuration of an elevator. In this figure, an upper part of a car 1 is fixed to an upper beam 2, and one end of a main rope 3 is attached to the upper beam 2. The other end of the main rope 3 is attached to the counterweight 4 in a state of being wound around the hoisting sheave 5 and the solace sheave 6. The hoisting sheave 5 is driven to rotate by a drive motor 7, and the drive motor 7 is controlled by an elevator control circuit 8 (note that the drive motor 7 is not shown in the drawings. Controlled via an inverter device).
[0003]
A frame member 10 is disposed on the bottom surface side of the floor plate 1a of the car 1 via a plurality of vibration isolating rubbers 9 as elastic members, and the lower surface side of the frame member 10 is fixed to a lower beam 11. At a substantially central position on the bottom side of the floor plate 1a, a linear former 13 as a weighing device having a pair of mounting seats 12, 12 at an upper end and a lower end is disposed. The linear former 13 includes a coil portion 13a fixed at a predetermined position and a core portion 13b inserted through the coil portion 13a, and a relative position change between the coil portion 13a and the core portion 13b. , A voltage signal is output as a load detection signal. That is, when the load on the floor plate 1a increases, the vibration isolating rubber 9 bends and the floor plate 1a itself displaces downward by a very small amount, and accordingly, the position of the core portion 13b through which the coil portion 13a is inserted also moves downward. Displace. Since the voltage level induced in the coil section 13a changes according to the displacement of the core section 13b at this time, the change in the voltage level can be extracted as a voltage signal indicating the change in the load state. This voltage signal is output to a gain control circuit 14 in the elevator control circuit 8, and the gain control circuit 14 performs gain control on the drive motor 7 based on this voltage signal.
[0004]
The configuration in FIG. 3 is a so-called “slippery type” elevator, and the elevator control circuit 8 controls the driving force of the driving motor 7 according to the weight difference between the car 1 and the counter weight 4, The car 1 and the counterweight 4 are moved up and down in opposite directions via a hoisting sheave 5 and a solace sheave 6. In general, when the load in the car 1 is 45% (may be 50% depending on the type of the elevator), the car 1 and the counterweight 4 are balanced. In this balanced state, a voltage signal of 0 V is output from the linear former 13. Then, as the load in the car 1 becomes larger than 45%, the voltage signal increases to the minus side, while as the load in the car 1 becomes smaller than 45%, the voltage signal increases to the plus side.
[0005]
FIG. 4 is a load-voltage characteristic diagram showing a relationship between such a load state in the car 1 and a voltage signal output from the linear former 13. The straight line A0 in this figure shows the characteristics at the time of new installation of the elevator, that is, at the initial stage of installation of the linear former 13, and is 2.1 V at 0% load, 0 V at 45% load, and 100 V at 100% load, respectively. Sometimes, a voltage signal of −2.5 V is output from the linear former 13, and the slope is α.
[0006]
The linear former 13 outputs a voltage signal having the above-described characteristics, and the gain control circuit 14 can appropriately perform gain control on the drive motor 7 based on the voltage signal. It has been secured. However, after a certain period has elapsed from the initial installation time of the linear former 13, the error in the correspondence between the load state and the voltage level as shown in FIG. 4 gradually increases, and the voltage signal changes to the correct load state. It is no longer a representation. For this reason, the gain control circuit 14 cannot perform the gain control properly, and as a result, a comfortable ride comfort in the car 1 cannot be secured. For example, when the car 1 attempts to ascend, the ascent operation is started after descending once, or conversely, when the car 1 is ascended, the ascending operation is started after descending once. (Such a phenomenon is called "hanging"), which results in discomfort to the elevator user.
[0007]
Since the linear former 13 can be considered as a kind of transformer and has a structure that is simple and hard to break down (for example, refer to Patent Document 1 for the structure of the linear former), the error in the load-voltage characteristics as described above. Does not necessarily exist in the linear former 13 itself. The cause lies in the fact that a relative position change between the coil portion 13a and the core portion 13b in the linear former 13 is adopted by utilizing a deformation of the vibration isolating rubber 9 which is an elastic member. I have. That is, when a certain period or more elapses from the initial stage of installation of the linear former 13, the anti-vibration rubber 9 (the material is, for example, natural rubber and the hardness is about 35 to 53 degrees) deteriorates due to aging, A change in the amount of deflection for the same load cannot be avoided. Then, due to the deterioration of the material, the correct correspondence between the load state and the voltage level is impaired, and even if the same load is applied, after a certain period or more, the linear former 13 has a different level from the initial installation time. This results in outputting a voltage signal.
[0008]
In order to cope with such a situation, conventionally, after a lapse of a certain period from the initial installation of the linear former 13, the load-voltage characteristics of the linear former 13 are readjusted by the following method, for example. Had been First, the worker M1 brings in a predetermined number of test weights 16 and sets the load in the car 1 to a 45% load. At this time, the linear former 13 should have output a voltage signal of 0 V at the time of initial installation, but at this time, the position change amount of the core portion 13 b is large due to the deterioration of the material of the anti-vibration rubber 9. , And outputs a negative voltage signal. Therefore, the worker M1 adjusts the resistance value of the variable resistor 15 as the characteristic variable means provided in the gain control circuit 14, and returns the voltage signal swinging to the negative side at the present time to 0 V at the initial installation time. To do. Note that the position of “0 V” at “45% load” on the straight line A0 is referred to as “zero point”, and setting this zero point to a correct position may be referred to as zero point adjustment.
[0009]
Next, the worker M1 loads a larger number of test weights 16 in the car 1, sets the load in the car 1 to 100% load, and determines whether the voltage signal of the linear former 13 at this time is -2.5V. By determining whether the inclination of the characteristic line A0 is α, it is determined whether or not the inclination of the characteristic line A0 is α. Then, after that, all the test weights 16 are carried out from the car 1 and the elevator is actually operated in a state where the load in the car 1 is set to 0% load, and it is confirmed whether the “hanging-down” phenomenon occurs or not. For example, it is verified whether readjustment of the load-voltage characteristic of the linear former 13 has been properly performed. By such a readjustment operation, a correct correspondence between the load state in the car 1 and the voltage level of the voltage signal of the linear former 13 can be recovered, and the gain control circuit 14 controls the gain control for the drive motor 7. It can be done correctly.
[0010]
[Patent Document 1]
JP-A-8-245109 (see paragraphs 0004 and 0005, FIG. 5; however, in this publication, a "differential transformer" is used instead of a "linear former").
[0011]
[Problems to be solved by the invention]
However, the above-described method of adjusting the output characteristics of the linear former involves carrying work to bring a plurality of test weights 16 into or out of the car 1, and thus requires a great deal of labor for the worker M 1. Not only complicates the process but also requires a lot of work time. Further, there is a possibility that the worker M1 may accidentally drop the test weight 16 during the transportation operation, thereby causing an unexpected injury or damaging a building, a property, or the like. Further, the test weight 16 needs to be stored in a predetermined storage location, but a storage location that requires a considerable space for readjustment of the output characteristics of the linear former which is not performed frequently. Had to be secured. As described above, since the conventional readjustment method of the output characteristics of the linear former is based on the premise that the test weight 16 is used, there are many disadvantages for the elevator maintenance company and the user. .
[0012]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a readjustment method of an elevator weighing device that can perform readjustment work without using a test weight.
[0013]
[Means for Solving the Problems]
As means for solving the above-mentioned problems, the invention according to claim 1 is directed to an elevator in a case where the load-voltage characteristic of a linear former attached to a car via an elastic member is readjusted using characteristic changing means. In the readjustment method of the weighing device, the output voltage data of the linear former in the state of 0% load is compared with that at the time of initial installation of the linear former and that at the present time, and the difference between the data at both times is at a certain level. When the output voltage level is within the range that can be adjusted by the variable resistance as described above, the output voltage level at the current point in time of the 0% load state is made to match the output voltage level at the initial point of installation by using the characteristic variable means. Thus, the output characteristics of the linear former from the current 0% load state to the 100% load state are reset.
[0014]
According to a second aspect of the present invention, in the first aspect of the present invention, when the difference between the data at the two points in time is within a certain level or more and cannot be adjusted by a variable resistor, the mounting position of the linear former is set. Is adjusted so that the difference between the data at the two points in time falls below a certain level or falls within a range adjustable by a variable resistor.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a readjustment method of the elevator weighing device according to the embodiment of the present invention will be described. The configuration of the elevator system to which the readjustment method of the present embodiment is applied is the same as that shown in FIG. The readjustment method of the present invention is very simple, and the content of the readjustment method is as follows: the load state in the car 1 is set to a no-load state, that is, 0% load state, and the voltage level of the voltage signal output from the linear former 13 in this state. Is returned to the voltage level at the time of initial installation by adjusting the variable resistor 15.
[0016]
This will be described in more detail with reference to the characteristic diagram of FIG. The straight line A0 in this figure is the same as that in FIG. 4, and shows the characteristics of the linear former 13 at the initial stage of installation. In the conventional readjusting method, as described above, the test weight 16 is brought into the car 1 so as to reproduce the actual load state, and the zero point is adjusted in this state. Conventionally, the reason for performing the readjustment work using the test weight 16 in this manner is that it is impossible to reliably know how the output characteristic A0 of the linear former 13 actually changes due to aging. A simple idea that if a zero-point adjustment operation is performed after a load is actually applied to the floor plate 1a in the interior 1, a reliable adjustment result that does not hinder actual elevator operation will be obtained for the time being. Based on
[0017]
On the other hand, in the present invention, the characteristic A0 at the initial stage of the installation of the linear former 13 changes to A1 indicating the characteristic at the current time due to aging after a certain period of time has elapsed, as indicated by an arrow Y1. It is assumed that the characteristic A1 should only be a translation of the characteristic A0. Such a premise is that due to the structure of the linear former 13, functional deterioration due to aging is not considered in the linear former 13 itself, so that the deterioration from the characteristic A0 to the characteristic A1 is mainly caused by the deterioration of the material of the vibration isolation rubber 9. However, this deterioration of the material is a result of the fact that the elasticity of the anti-vibration rubber 9 is not sufficiently reduced (the loss of the elasticity of the anti-vibration rubber 9 is extremely long for several decades or more). It will take some time).
[0018]
Therefore, if the characteristic A1 is caused by the parallel movement of the characteristic A0, a certain point on the characteristic A1 is specified, and if this point is moved again on the characteristic A1 by adjusting the variable resistor 15, the arrow Y2 As shown by, the entire characteristic A1 can be returned to the characteristic A0. If a point corresponding to 0% load (that is, no load) is selected as one point to be moved by adjusting the variable resistor 15, it is convenient because the test weight 16 does not need to be used as in the related art. For example, if the output voltage at the time of 0% load detected at the present time is 1.9 V, the maintenance worker checks that the output voltage at the time of 0% load at the initial stage of installation was 2.1 V (this The data “2.1V” is always stored as one of the elevator new installation specification data.) By adjusting the variable resistor 15, the output voltage 1.9V is slid to 2.1V. You can do it. In this case, since the characteristic A1 and the characteristic A0 are in a parallel relationship to each other, and it is known that the gradients are both the same α, there is no need to bother to check that the gradient is α.
[0019]
The maintenance worker can end the readjustment work of the output characteristics of the linear former 13 only by the simple work as described above, so that the labor of the maintenance worker performing the readjustment work can be greatly reduced. it can. Also, the time required for the readjustment operation is about 120 minutes according to the conventional method using the test weight, but the readjustment operation of the present invention can reduce the time to about several tens of minutes. . The reliability of the readjustment operation of the present invention has been verified by the present inventors to be the same as that of the conventional method using the test weight.
[0020]
FIG. 1 is a flowchart showing a specific procedure of the readjustment method of the elevator weighing device according to the present embodiment. First, the maintenance worker detects the output voltage D1 (1.9 V in the above example) in the 0% load state at the present time (step 1). Next, the maintenance worker checks the output voltage D0 (2.1V in the above example) in the 0% load state at the time of the initial installation from the stored elevator new installation specification data, and compares this D1 with D0. (Step 2). Then, it is determined whether or not the difference between D1 and D0 is within ± 0.1 V (step 3). If it is within ± 0.1 V, readjustment is unnecessary and the operation is terminated.
[0021]
In the above example, since the difference between D1 and D0 is -0.2 V, the determination result in step 3 is "NO". Therefore, the maintenance worker next determines whether or not the difference of -0.2 V is within a range that can be adjusted by the variable resistor 15 (step 4). In the present embodiment, the voltage difference that can be adjusted by the variable resistor 15 is, for example, up to 0.6 V. If the voltage difference is larger than 0.6 V, the mounting position of the linear former 13 needs to be adjusted. Therefore, in this case, the determination result of step 4 is “YES”. Then, the maintenance worker adjusts the variable resistor 15 to bring the voltage D1 (1.9 V) currently output from the linear former 13 closer to D0 (2.1 V) (step 5), and the difference between the two is ±. The operation is terminated when the voltage falls within 0.1 V.
[0022]
If the determination result in step 4 is "NO", that is, if the difference between D1 and D0 is larger than ± 0.6 V (for example, in such a case, the linear (It is possible that the mounting position of the linear former 13 is greatly displaced or the anti-vibration rubber 9 is severely damaged.) Repair work such as adjusting the mounting position of the linear former 13 or replacing the anti-vibration rubber 9 (Step 6). Then, if it is determined that the difference between D1 and D0 is within ± 0.1 V by such repair work (step 3), the work is terminated as it is. Repeat steps 4 and after.
[0023]
According to such a procedure, the maintenance worker can readjust the output characteristics of the linear former 13 by a simple operation basically only by changing the resistance value of the variable resistor 15.
[0024]
In the above embodiment, the example in which the natural rubber vibration-proof rubber 9 is used as the “elastic member” has been described. However, the present invention is not limited to this, and the elasticity is sufficient to withstand a car load and not to impair ride comfort. It is possible to use another member (for example, a coil spring or the like) as long as the member has.
[0025]
Further, in the above-described embodiment, the configuration has been described in which the linear former 13 is attached to the bottom surface side of the floor plate 1a, and the linear former 13 outputs a voltage signal according to the amount of deformation of the vibration isolating rubber 9, that is, the amount of sinking of the floor plate 1a. A configuration in which the linear former 13 is attached to the upper beam 2 side, and the linear former 13 outputs a voltage signal in accordance with the amount of deformation of a compression spring or the like inserted in the holding member that holds the car 1. (For example, refer to JP-A-2002-154760).
[0026]
【The invention's effect】
As described above, according to the present invention, the readjustment of the output characteristics of the linear former as the weighing device can be performed easily and quickly without using a test weight. Therefore, the labor and work time that the maintenance worker bears during the readjustment operation can be significantly reduced. Also, depending on how the test weights are handled, maintenance personnel can be prevented from being injured unexpectedly or damaging buildings, equipment, etc., and further, it is not necessary to consider the storage location of the test weights. It can bring many benefits to companies and users.
[Brief description of the drawings]
FIG. 1 is a flowchart showing a specific procedure of a method for readjusting an elevator weighing device according to an embodiment of the present invention.
FIG. 2 is a characteristic diagram showing a characteristic A0 at the initial stage of installation of the linear former used in the embodiment of the present invention and a characteristic A1 at the current time.
FIG. 3 is an explanatory diagram schematically showing a general configuration of an elevator to which a conventional method and a method according to an embodiment of the present invention are applied.
FIG. 4 is a load-voltage characteristic diagram showing a relationship between a load state in the car 1 and a voltage signal output from the linear former 13 in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Basket 1a Floor plate 2 Upper beam 3 Main rope 4 Counter weight 5 Hoisting sheave 6 Solase sieve 7 Drive motor 8 Elevator control circuit 9 Anti-vibration rubber (elastic member)
10 Frame member 11 Lower beam 12 Mounting seat 13 Linear former (scaler)
13a Coil part 13b Core part 14 Gain control circuit 15 Variable resistance (characteristic variable means)
16 Test weight M1 Worker A0 Characteristics of linear former at initial stage of installation A1 Characteristics of linear former at present time α Slope of characteristic line

Claims (2)

In the readjustment method of the elevator weighing device when the load-voltage characteristics of the linear former attached to the car via the elastic member are readjusted using the characteristic variable means,
With respect to the output voltage data of the linear former under the 0% load condition, the data at the initial stage of the linear former installation and the current one are compared, and the difference between the data at both times is more than a certain level and can be adjusted by a variable resistor. In this case, the output voltage level at the present time of the 0% load state is made to coincide with the output voltage level at the initial stage of the installation by using the characteristic varying means, so that Reset the output characteristics from 0% load state to 100% load state.
A method for readjusting an elevator weighing device. When the difference between the data at the two points in time is not less than a certain level and is in a range that cannot be adjusted by a variable resistor, the difference between the data at the two points in time is adjusted by adjusting the mounting position of the linear former. Less than or within a range that can be adjusted with a variable resistor,
The method for re-adjusting an elevator weighing device according to claim 1, wherein:

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