JPH11335027A - Weighing device for elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically correct a deviation in an initial set value of a weighing device for an elevator. SOLUTION: This weighing device is composed of a load detecting means 9 for detecting a carrying load of an elevator, a memory means 22 for storing therein an initial signal from the load detecting means 9 as an initial set value in a no-load condition of an elevator, a comparing means 23 for comparing the initial value stored in the memory means 22 with an output value from the load detecting means 9 in a no-load condition thereafter, and a reset means 24 for making the output value of the load detecting means 9 coincident with the initial set value so as to eliminate a difference if this difference is present in the result of comparison by the comparing means 23. With this arrangement, the elevator car can run smoothly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator weighing apparatus, and more particularly to an elevator for detecting a load of an elevator car in order to obtain a signal necessary to balance a counterweight according to the load. The present invention relates to a weighing device.

[0002]

2. Description of the Related Art FIG. 4 is a perspective view showing the structure of a general rope-type elevator car. A floor frame 2 is provided under the floor of the car 1, and the floor frame 2 is sandwiched between vibration-proof rubbers 3 by a floor receiving frame 4.
, And the floor receiving frame 4 is fixed to the frame 5. The frame 5 is provided so as to surround the car 1 and includes a lower beam 5a, an upper beam 5b, and a pair of vertical beams 5c. The car 1 and the main cable 6 are connected by fixing the main cable 6 to the upper beam 5b. In addition, upper beam 5
The shackle rod 7 connected to the main rope 6 is fixed to the upper beam 5b via a spring 8, as shown in FIG. It is done by being done.

FIGS. 6 and 7 show an elevator weighing device provided in a general rope type elevator car. Referring to these drawings, two types of elevator weighing devices having different installation positions will be described. I do.

First, FIG. 6 shows an example in which an elevator weighing device is provided under the floor of the car 1, and is an enlarged view of the vicinity of the lower beam 5a viewed from the direction of arrow A in FIG. As shown in this figure, an anti-vibration rubber 3 which is an elastic body is interposed between a floor frame 2 under the floor of the car 1 and a floor receiving frame 4,
A differential transformer 9 is provided between the floor frame 2 and the lower beam 5a. As shown in an enlarged manner in FIG. 8, the differential transformer 9 includes a differential transformer main body 9a and a differential transformer movable section 9.
b. And the differential transformer body 9a
Is fixed to the lower beam 5a, and the differential transformer movable portion 9b is fixed to the floor frame 2. This differential transformer 9 is provided for detecting the load of the car 1 and is used to
When the car 1 is placed on the car 1, the vibration isolating rubber 3 shrinks and the floor frame 2 lowers, so that the gap L between the differential transformer main body 9a and the differential transformer movable section 9b shrinks. The operation will be described later.

On the other hand, FIG. 7 shows an example in which an elevator weighing device is provided above the car 1, and an arrow A in FIG.
It is an enlarged view near the upper beam 5b seen from the direction. As shown in FIG. 5 and also in FIG. 7, a shackle rod 7 is attached to the upper beam 5b via a spring 8 which is an elastic body, and the main rope 6 is fixed by the shackle rod 7. . A differential transformer 9 is provided between the upper beam 5b and the shackle rod 7. That is, the differential transformer main body 9a is fixed to the upper beam 5b, and the differential transformer movable portion 9b is fixed to the shackle rod 7. Therefore, when the passenger 10 rides on the car 1, the spring 8 contracts, and the gap L between the differential transformer main body 9a and the differential transformer movable portion 9b contracts.

FIG. 9 shows a displacement characteristic of an elastic body such as the vibration isolating rubber 3 or the spring 8. When a load is taken along a horizontal axis and a displacement is taken along a vertical axis, the elastic body is subjected to an applied force, that is, a load. It can be seen that the displacement changes in proportion to the load. Then, the displacement of the elastic body is converted into an AC voltage by the differential transformer 9. FIG. 10 is a characteristic diagram of the differential transformer 9. When the horizontal axis indicates the gap dimension L between the differential transformer main body 9a and the differential transformer movable portion 9b and the vertical axis indicates the AC output voltage, the differential transformer 9 shows that the output voltage changes in proportion to the gap L, and also changes in the plus direction and the minus direction.

As described above, the elevator weighing device detects the displacement of an elastic body such as the vibration isolating rubber 3 or the spring 8 by the differential transformer 9, and controls the elevator device by using the detected displacement as a load signal. Is sent to a control panel (not shown) for performing the operation. Then, the control panel converts the load signal (AC voltage) sent from the differential transformer 9 into a form that is easy to handle, and performs load correction in accordance with the load.

As is well known, an elevator car 1 and a counterweight (shown in FIGS. 1 and 2 described later) are fixed to both ends of a main rope 6 engaged with a sheave in a machine room. The main rope 6 is moved by the rotation of the sheave, and as the car 1 rises, the counterweight decreases accordingly, and conversely, as the car 1 lowers, the counterweight rises accordingly. For example, in the case of a lift-type elevator, the car 1 and the counterweight are designed to be balanced in a state of 45% of the total load. In other words, in the unloaded state where no one is on the car 1, the counterweight is heavier than the car 1,
In order to lower the car 1, it is necessary to apply an extra driving force to the car in the direction of the car by the weight of the counterweight. Conversely, when there are many people in car 1, car 1 is heavier than the counterweight, so car 1
In order to raise the weight of the car 1, it is necessary to additionally apply a driving force corresponding to the weight of the car 1 in the direction of the counterweight.

FIG. 11 is a characteristic diagram for explaining the relationship between the load signal as the output signal of the differential transformer 9 and the load on the car 1. Here, the load signal output as an AC voltage from the differential transformer 9 is converted into a DC voltage in a form that is easy to handle for control (hereinafter, referred to as a load conversion signal voltage). Gain adjustment)
And the position b (zero adjustment) of the zero point of the voltage can be adjusted. The characteristic line indicated by the solid line in FIG. 11 will be described.
% And put the car 1 and the counterweight in a state of equilibrium. In this state, adjust the position b of the zero voltage point so that the load conversion signal voltage becomes zero, and then fully load the car 1 The weight α corresponding to the load is put on the load conversion signal voltage and the voltage gradient α is adjusted so that the load conversion signal voltage becomes the set voltage (for example, 10 V). As a result, the load on the car 1 can be accurately determined from the load conversion signal voltage. The characteristic line indicated by the broken line will be described later.

FIG. 12 is a characteristic diagram showing the relationship between the load conversion signal voltage and the load. The characteristic line shown by a solid line in this figure indicates the relationship between the adjusted load conversion signal voltage and the load. (That is, in the initial setting state). From this characteristic diagram, if the load conversion signal voltage indicates 10 V, it indicates that the specified full load (100% load) is on the car 1, and the load conversion signal voltage indicates 0V. It means that 45% of the total load is on the car 1, and the load conversion signal voltage is -8.2.
If V is shown, car 1 has no load (0%)
You can see that. In other states, since the load conversion signal voltage is proportional to the load, the load can be immediately known by reading the voltage. Therefore, the control panel of the elevator apparatus knows the loaded load of the car 1 from this load conversion signal voltage, and automatically applies a force corresponding to the rise or fall of the car 1 in the car direction or the counterweight direction. To control the elevator car operation smoothly. Also in this figure, the characteristic line shown by the broken line will be described later.

[0011]

By the way, for example, when the vibration isolating rubber 3 interposed between the floor frame 2 and the floor receiving frame 4 becomes weak and loses elasticity due to aging, etc., Since the vibration isolating rubber 3 shrinks even when no load is applied, the gap L between the differential transformers 9 changes. That is, the gap L between the differential transformer main body 9a and the differential transformer movable portion 9b
However, if the load changes due to a factor other than the load on the car 1, a load signal different from the actual load is output from the differential transformer 9,
In the control panel, a force not corresponding to the load is applied in the direction of the car or the counterweight. for that reason,
The operation of the elevator car was not smooth, which resulted in poor ride comfort and breakdown.

This state will be described with reference to FIG. 11. When the position b of the zero point of the load conversion signal voltage moves parallel to the characteristic line shown by the solid line by δ as shown by the characteristic line shown by the broken line. This is the state at the position b '. That is, in more detail with reference to FIG. 12, the position of the zero point of the load conversion signal voltage is changed from the characteristic line in the initial setting state shown by the solid line to the characteristic line shown by the broken line due to aging and the like. And δ
Will be translated. Therefore, for example, when the loading load is 80%, the load conversion signal voltage is 10 V in the characteristic line shown by the broken line, which is a voltage corresponding to the specified full loading load (100%). In the control panel, a force corresponding to the total load (100%) is applied in the direction of the car or the counterweight even though the actual load is 80%.

As described above, when the output of the differential transformer 9 comes out of the initial setting state, it is necessary to adjust the load conversion signal voltage again. To do so, since the voltage gradient α does not change, the position b ′ of the zero point of the load conversion signal voltage translated in parallel by δ may be returned to the point b. Therefore, as described above, the weight of 45% of the specified total load is placed on the car 1 so that the car 1 and the counterweight are in a balanced state, and the zero point of the voltage is set so that the load conversion signal voltage becomes zero. The position b is adjusted (however, it is not necessary to adjust the voltage gradient α).

This work is not performed much because a weight must be arranged each time and work time is required. Normally, when the load conversion signal voltage is first adjusted (at the time of initial setting), a load conversion signal voltage value in a state where no load is applied (0%) is recorded (for example, -8.2 V), and the load conversion signal voltage is recorded. If the position of the zero point of the signal voltage is shifted and the load conversion signal voltage is, for example, -4.5 V in a state where no load is applied (0%), as indicated by a characteristic line shown by a broken line, The voltage value (-8.2 V) recorded at the time of setting is restored.

The former method of adjusting by putting a weight of 45% of the total load is to return the point b 'to the point b in FIG. 11, and the latter is adjusted in a state where there is no load (0%). In FIG. 11, the point a ′ is returned to the point a in FIG. 11. As a result, the same is performed, and it can be said that the latter is superior because the weight is not used.

However, both adjustment methods have to be performed manually, which is troublesome and inefficient. The present invention has been made to solve such a problem.

[0017]

According to a first aspect of the present invention, there is provided a load detecting means for detecting a loaded load of an elevator and transmitting a signal corresponding to the load, and a load detecting means for detecting a load according to the load. Storage means for storing an initial signal as an initial setting value, and comparing means for comparing the initial setting value stored in the storage means with an output value of the load detecting means in a no-load state of the elevator thereafter,
If there is a difference in the comparison result by this comparing means,
Reset means for making the output value of the load detecting means coincide with the initial set value so that the difference is eliminated.

As a result, the correction work conventionally performed manually can be automated, so that the work time can be shortened, and the reset work for matching the initial set value with a short cycle can be carried out, so that the lift of the elevator car can be reduced. Operation can be smooth.

According to a second aspect of the present invention, in the configuration of the first aspect, the load detecting means is provided between the floor frame and the support frame of the elevator via a plurality of elastic bodies, The loaded load is detected based on the displacement of the elastic body.

According to this, the installation position of the load detecting means is specifically shown, and the same effect as the first aspect of the invention can be obtained.

According to a third aspect of the present invention, in the configuration of the first aspect, the load detecting means is provided between the support frame of the elevator and the main rope supported on the support frame via an elastic body. And the load is detected based on the displacement of the elastic body.

Thus, the installation position of the load detecting means different from that of the second aspect is specifically shown. Even in this case, the same effect as that of the first aspect can be obtained.

According to a fourth aspect of the present invention, in the configuration according to any one of the first to third aspects, the load detecting means is specified to be a differential transformer.

[0024] Thereby, the invention can be more easily implemented.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an elevator weighing apparatus according to the present invention will be described below in detail with reference to FIGS.

FIG. 1 is a flowchart showing the operation of an elevator weighing apparatus according to the present invention. First, the basic concept of the present invention will be described with reference to this flowchart.

In step 1, as described above with reference to FIG.
A weight of 5% is put on the car 1 so that the car 1 and the counterweight are in a balanced state. In this state, the position b of the zero voltage point is adjusted so that the load conversion signal voltage becomes zero.
Then, the work of adjusting the voltage gradient α so that the load conversion signal voltage becomes the set voltage (for example, 10 V) is completed by placing a weight corresponding to the entire load. Next, the process proceeds to step 2, in which a load conversion signal voltage in a state where no load is loaded on the car 1 is stored in an initialization load signal storage device provided in a control panel described later. Then, the elevator is operated normally (step 3).

Next, in step 4, the load conversion signal voltage at that time is measured at a time such as when the elevator is at rest, such as at night. That is, at this time, no passenger is on the car 1, and the car 1 is empty and has no load. The load conversion signal voltage at this time is compared with the load conversion signal voltage previously stored in the initially set load signal storage device (step 5). If the comparison results match, the process returns to step 3 to continue normal operation of the elevator. If the comparison results do not match, the process proceeds to step 6 and the load conversion signal voltage measured in step 4 is calculated. Correction is made so as to match the load conversion signal voltage stored in the initial setting load signal storage device. That is, as shown in FIG. 11, when the load conversion signal voltage measured in step 4 is like a ', the voltage is adjusted to return it to a.

It is an object of the present invention to automatically correct the output error of the differential transformer 9 due to the secular change of the vibration isolating rubber 3 and the spring 8.

Next, a specific embodiment of the elevator weighing apparatus according to the present invention will be described.

FIG. 2 shows, as a first embodiment of the present invention, an elevator weighing apparatus in which a differential transformer 9 is provided under the floor of a car 1 of an elevator. 6, a floor frame 2 is provided under the floor of the car 1, and the floor frame 2 is fixed to the floor receiving frame 4 by damping the rubber cushion 3, and the floor receiving frame 4 is provided with the lower beam 5a. It is fixed to. 7, one end of the main rope 6 is fixed to a shackle rod 7 fixed to the upper beam 5b via a spring 8, and the other end of the main rope 6 is fixed to a counterweight 11. As shown in FIG. I have. The main rope 6 is hooked on the sheave 12 in the machine room. The rotation of the motor 13 connected to the sheave 12 causes the sheave 12 to rotate, and the car 1 moves up and down according to the rotation direction. I do.

The differential transformer 9 for detecting how many people are in the car 1 and the load on the car 1 has a differential transformer main body 9a fixed to the lower beam 5a and a differential transformer movable section 9b connected to the floor frame 2 Is provided below the floor of the car 1. The load signal from the differential transformer 9 (which is an AC voltage) is
Is transmitted to a control panel 20 for controlling an elevator device installed in a machine room.

The control panel 20 includes a load signal arithmetic unit 21 for converting a load signal of an AC voltage sent from the differential transformer 9 into a load conversion signal in the form of a DC voltage which is easy to handle for control. Position b of zero voltage point described in FIG.
And an initial load signal storage device 22 for storing the value of the correct load conversion signal after the adjustment of the voltage gradient α is completed,
A load signal determining device 23 that compares the value of the correct load conversion signal with the value of the current load conversion signal to determine whether the current load conversion signal is a normal value; and the current load signal is not normal. A load signal reset device 24 that returns the value to a normal value when it is determined that the load conversion signal is normal, and a motor control device 25 that controls the motor 13 to send a force corresponding to the load conversion signal are provided.

Next, the operation of the present invention configured as described above will be described.

As described above as the prior art, when the passenger 10 rides on the car 1, the anti-vibration rubber 3 contracts and the floor frame 2 lowers, so that the gap L between the differential transformer main body 9a and the differential transformer movable section 9b is reduced. Shrink. The amount of shrinkage is proportional to the load (passenger), and this amount of shrinkage is transmitted as a load signal from the differential transformer 9 to the control panel 10 in the machine room. This load signal is an AC voltage and is difficult to control as it is (that is, the output voltage is different due to the individual characteristics of the differential transformer 9 or the amount of change in the voltage is different, and the AC is difficult to handle on the control board). ).
To any shape by. Specifically, the voltage is converted into a DC voltage, and the voltage gradient α (gain adjustment) and the position b (zero adjustment) of the zero voltage point are changed as shown in FIG.
Then, the load conversion signal is transmitted to the motor control device 25, and the motor control device 25 applies a force corresponding to the load to the motor 1.
3

However, when the gap L between the differential transformer main body 9a and the differential transformer movable part 9b changes due to a factor other than the load, the correct load conversion signal shown by the solid line in FIG. 11 is displaced as shown by the broken line. Would be. Therefore, the present invention stores a normal load conversion signal at the time of initial setting,
When the load conversion signal is displaced due to a cause other than the load, the value of the point a (unloaded state) shown in FIG.
At the time of the operation of the elevator,
The load conversion signal supplied from the load signal calculation device 21 in the unloaded state and the normal load conversion signal at the time of initial setting stored in the initial setting load signal storage device 22 are:
The comparison is made by the load signal determination device 23. As a result, when there is an error equal to or more than the specified value (for example, 30 kg), the load signal reset device 24 outputs a value of the load conversion signal when the output of the load signal calculating device 21 is normal (for example,-).
8.2 V).

In the normal operation state of the elevator, since the load conversion signal does not greatly deviate within several hours, the load conversion signal is compared with the initial setting value stored in the initial load signal storage device 22. Comparison and error correction
It is sufficient to carry out about once a day. For example, if the car 1 is stopped during a time period when the elevator is not operating much, such as at midnight, the car is in the unloaded state, and the value of the load conversion signal from the load signal determination device 23 at this time and the initial set load The value of the load conversion signal at the time of initial setting stored in the signal storage device 22 is compared to determine whether or not there is an error equal to or greater than a reference, and the load signal reset device 24 operates according to the determination result. I do. Thus, the elevator is always operated properly.

FIG. 3 shows, as a second embodiment of the present invention, a differential transformer 9 between an upper beam 5b of an elevator car 1 and a shackle rod 7, similarly to the one shown in FIG.
1 shows an elevator weighing apparatus provided with the following.
The second embodiment differs from the first embodiment described with reference to FIG. 2 only in the position where the differential transformer 9 is provided, and other configurations and operations are the same. In FIG. 3, the same portions as those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof will be omitted.

According to the present invention, the initial value of a normal load conversion signal is stored, and when the load conversion signal is deviated due to aging or the like, the original normal load conversion signal is restored. Therefore, it is needless to say that the present invention is not limited to the elevator weighing device using the differential transformer 9 but can be applied to various means for detecting a load using a change in an elastic body.

[0040]

As described above in detail, according to the first aspect of the present invention, when the load conversion signal is deviated due to aging or the like, the load conversion signal which has been conventionally performed manually is used. Since the reset operation for returning to the initial set value can be automated, the operation time required for inspection and adjustment can be extremely reduced. In addition, by performing the inspection and the reset operation in a short cycle, for example, every day, the operation of the elevator car can be performed smoothly, and the occurrence of failure can be reduced.

In the second and third aspects of the present invention, the load detecting means is specifically shown in the configuration of the first aspect of the present invention. The same effect as described above can be obtained. Further, in the invention according to claim 4, in the configuration according to any one of claims 1 to 3, the load detection means is specified to a differential transformer. The same effect as that of the invention can be obtained.

[Brief description of the drawings]

FIG. 1 is a flowchart showing the operation of an elevator weighing device according to the present invention.

FIG. 2 is a configuration explanatory view showing a first embodiment of an elevator weighing device according to the present invention.

FIG. 3 is a configuration explanatory view showing a second embodiment of the elevator weighing apparatus according to the present invention.

FIG. 4 is a perspective view illustrating a configuration of a car of a general rope type elevator.

FIG. 5 is an enlarged view of a portion P in FIG. 4;

6 is an enlarged view of the vicinity of a lower beam viewed from the direction of arrow A in FIG. 4, showing an example in which an elevator weighing device is provided under the floor of a car.

FIG. 7 is an enlarged view of the vicinity of the upper beam seen from the direction of arrow A in FIG. 4, showing an example in which an elevator weighing device is provided above the car.

FIG. 8 is an enlarged perspective view of the differential transformer.

FIG. 9 is a characteristic diagram showing displacement characteristics of an elastic body such as a vibration-proof rubber or a spring.

FIG. 10 is a characteristic diagram showing a relationship between a displacement of a differential transformer and an output voltage.

FIG. 11 is a characteristic diagram shown for explaining a relationship between a load signal, which is an output signal of a differential transformer, and a load on a car;

FIG. 12 is a characteristic diagram showing a relationship between a load conversion signal voltage and a load.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Basket 3 Anti-vibration rubber 6 Main cable 7 Shackle rod 8 Spring 9 Differential transformer 9a Differential transformer main body 9b Differential transformer movable part 11 Counterweight 12 Sheave 13 Motor 14 Tail code 20 Control board 21 Load signal calculating device 22 Initial Set load signal storage device 23 Load signal judgment device 24 Load signal reset device 25 Motor control device

Claims (4)

[Claims] 1. A load detecting means for detecting a loaded load of an elevator and transmitting a signal corresponding to the load; a storing means for storing an initial signal of the load detecting means in an unloaded state of the elevator as an initial set value; A comparing means for comparing the initial setting value stored in the storage means with an output value of the load detecting means in a subsequent no-load state of the elevator; and when a difference occurs in the comparison result by the comparing means, ,
An elevator weighing device, comprising: reset means for causing an output value of the load detecting means to match the initial set value so that the difference is eliminated. 2. The apparatus according to claim 1, wherein the load detecting means is provided between the floor frame and the support frame of the elevator via a plurality of elastic bodies, and detects a loaded load by a displacement of the elastic bodies. Item 2. The elevator weighing device according to Item 1. 3. The load detecting means is provided between a support frame of the elevator and a main rope supported on the support frame via an elastic body, and detects a loaded load based on a displacement of the elastic body. The elevator weighing device according to claim 1, wherein 4. The elevator weighing apparatus according to claim 1, wherein said load detecting means is a differential transformer.