JPS6117749B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for loading an elevator cab.

If the load of the elevator exceeds the rated value,
Not only is an excessive load placed on the drive system such as the electric motor, but the braking force of the electromagnetic brake that holds the elevator in place while the elevator is stopped is insufficient, causing the car to descend downwards with the door still open. A serious accident will occur.

Therefore, a weighing device is generally installed under the floor of the elevator car room, and the rated load is 1.05 to 1.11.
When the number doubles, an alarm will be generated.

In addition, especially in gearless elevators, when the electromagnetic brake is released at startup, if the load is large, the car will momentarily sink, but if the load is small, it will rise suddenly, although slightly, making the ride uncomfortable. In order to generate this, the load is detected and a current is passed through the motor in advance to generate rotational force, thereby compensating for the rotational force due to the unbalanced load.

This weighing device generally has a configuration as shown in FIGS. 1 and 2.

In Figure 1, 1 is the upper beam, 2 is the main rope, and 3
A vertical pillar, 4 is an emergency stop, 5 is a support frame, 6 is a brace, 7 is an elastic body such as anti-vibration rubber, 8 is a floor frame, and a side wall is erected around this edge to form a car compartment 9. are doing.
Further, the upper beam 1, the vertical pillar 3, and the support frame 5 form a frame body on which the car room 9 is placed. Also,
In FIG. 2, 10 is a weighing device, and 11 is a continuous load detection device.

When the load becomes 1.05 to 1.10 times the rated load and the elastic body 7, such as anti-vibration rubber, bends, a switch on the weighing device 10 is pressed to issue an alarm.

In addition, in gearless elevators, etc., the weighing device 10
In addition, a continuous load detection device 11 composed of a differential transformer or the like is provided to continuously detect the deflection of an elastic body such as anti-vibration rubber, and its output is used to adjust the input current of the motor.

The basic way to check whether this weighing device operates as expected is to load it with a load and check, but the cost of transporting and loading the load is high, and the time required to check it is also large. cause trouble to

Therefore, instead of transporting and loading the load, a method of creating the load equivalently has been adopted. Examples are shown in FIGS. 3 to 5. This conventional method will be explained below.

In Fig. 3, 20 is a rod, 21 is a spring, 2
2 is a washer and 23 is a nut.

The rod 20 is fixed to the lower beam of the floor frame 8 with bolts and nuts, passes through the support frame 5, and is stopped by a washer 22 and a nut 23 via a spring 21. By tightening the nut 23, the rod 20 is connected to the floor frame 8 and the support frame 5. During this time, a compressive load is applied to compressively deform the elastic body 7 such as vibration isolating rubber.

This method has problems with workability because the work must be done under the floor of the car. In particular, high-speed elevators have deep pits, making work difficult.

Next, in FIG. 4, 31 is a rod, 32 is a screw portion, 33 is a load cell, 34 is a holding plate, and 35 is a support plate.

By rotating the threaded portion 32, the rod 3
1 is expanded and contracted, a load is generated between the upper beam 1 and the floor frame 8 via the press plate 34 and the support plate 35, and the elastic body 7, such as vibration isolating rubber, is pressed and compressed and deformed.

This method cannot be used unless there is a suitable hole in the ceiling of the car. Furthermore, even if a hole is made, it is not always possible to implement this method because various devices are generally interposed between the ceiling of the car room and the upper beam. Another disadvantage is that the device is large and difficult to handle.

The method shown in FIG. 5 was devised to improve the drawbacks of the methods shown in FIGS. 3 and 4, and was previously filed.

In FIG. 5, 41 is a threaded portion for generating a load, 42 is a rod, 43 is a support plate, 44 is a load detection device, and 45 is a presser plate.

This method uses a screw section 41 between the upper beam and the car ceiling.
This generates a load and applies the load to the elastic body 7 such as vibration isolating rubber.

Since the operation is performed on the car ceiling, the operation is safe and easy.

However, since a screw jack consisting of a threaded portion 41 and a rod 42 is required to generate a load, the device is expensive and the load is not large enough to be easily carried.

Further, any of the systems shown in FIGS. 3 to 5 has a problem in inspecting the unbalanced load compensator that compensates for the instantaneous movement of the elevator due to the unbalanced load when the electromagnetic brake is released at the time of starting the elevator.

That is, the continuous load detection device 11 shown in FIG.
If there is, it is possible to apply a compressive load to the elastic body 7 such as anti-vibration rubber and measure the relationship between the load and the output of the detector 11, but if the motor current adjusted by the output of the detector 11 is It is impossible to confirm whether the value is appropriate to compensate for the rotational force generated by the unbalanced load, since no load is actually loaded and the rotational force due to the unbalanced load is not generated.

In particular, with the method shown in Figure 3, work must be done under the floor of the car, so it is dangerous to run current through the motor, and it is difficult to confirm what kind of compensation current flows through the motor. .

The purpose of the present invention is to provide a method that can generate a desired load with an extremely inexpensive and lightweight device without using a load generating device such as a screw jack, and can inspect a load detecting device and an unbalanced load compensating device. It is in.

In order to compress and deform the elastic body 7, such as vibration-proof rubber, by applying a load, it is sufficient to create a displacement between the floor frame 8 and the support frame 5 of the car room.

Support frame 5 supporting the elevator car
It can be moved up and down by an electric motor via the vertical pillar 3, upper beam 1 and rope 2. Therefore, it was thought that if the cage 9 was connected to the wall inside the tower by some method, it would be possible to generate a predetermined load using an electric motor.

An embodiment of the present invention will be described below with reference to FIG. In FIG. 6, 50 is a hook attached to the wall of the elevator hoistway, 51 is a reinforcing angle at the top of the car room, 52 is an end for attaching a rope 53 that connects the car room 9 to the wall, 54 is a spring, 5
5 is a load cell, 56 is a weight for detecting the angle between the rope 53 and the vertical line and correcting the output of the load cell to determine the vertical load; A fuse 58 is designed to be disconnected, and 58 is a device for synthesizing the outputs of the load detectors to detect the vertical load applied to the car compartment 9.
Reference numeral 9 denotes an operation panel for maintenance operation provided in the ceiling of the car room.

For verification of the weighing device, a device composed of 52 to 57 is attached to the hook 50 and the angle 51.

Next, operate the driving panel 59 to move the electric motor and lift the support frame 5 little by little via the main rope 2 and the upper beam 1, the spring 54 will stretch, and the vibration-proof rubber A load is applied to 7.

The total value of the magnitude of this load is measured by a load meter 58.

If you mistakenly continue upward operation for a relatively long time, a large load will be applied to the cab. Therefore, a so-called safety fuse 57 with a weakened strength is provided in a portion of the rope 53 to prevent the safety fuse from breaking before an excessive load is applied to the car compartment.

By the way, when an excessive load is applied to the car, an overcurrent also flows through the motor, so in this test, the safety fuse 57 was disconnected by setting the overcurrent relay of the motor to an appropriately low value. It is possible to prevent an excessive load from being applied to the car by activating the overcurrent relay beforehand.

Of course, if the system of the load cell 58 is normal, the load cell 58
operates and generates an alarm, at the same time cutting off the motor circuit.

In this method, an unbalanced load rotational force is generated, similar to when a load is actually loaded. If the motor stops rotating while an unbalanced load rotational force is being generated, it means that the motor is generating rotational force and the magnitude of the rotational force is opposite to the rotational direction of the unbalanced load rotational force. This is because the absolute values are equal. Therefore, the current flowing through the motor at this time completely compensates for the rotational force due to the unbalanced load.

From this, when there is a continuous load detection device 11 shown in FIG. Even if the command is returned to zero, the current flowing through the motor will remain at that value.

In this way it is possible to check the performance of the unbalanced load compensator.

By the way, although Fig. 6 shows the use of a load meter to detect the load, there is a certain degree of error, such as when verifying the weighing device, it is sufficient to confirm that it operates at 1.05 to 1.10 times the rated load. forgiven.

Therefore, it is often possible to measure the load by measuring the input current of the motor.

In particular, in DC gearless elevators, there is no reduction gear, so there is almost no difference between the rotational force generated by the motor and the force applied to the main rope, and since the hoisting motor is a DC motor, the motor input current and motor generation Since there is a proportional relationship between rotational forces,
By calibrating in advance, the load can be determined with considerable accuracy, and in this case, the load meter can be omitted. An ammeter is required to measure the input current of a motor, but ammeters are cheaper and easier to handle than load meters, and they are generally installed as equipment in elevators in many cases.

FIG. 7 shows another embodiment of the invention. In the figure, 61 is a hook attached to the floor frame. A hook 61 on the floor frame and a hook 50 attached to the hoistway wall are connected by a device consisting of 53 to 57.

This is adopted when the walls of the car room 9 cannot sufficiently bear the load.

However, in implementing this method, it may be troublesome to attach the device to the hook 61.

FIG. 8 shows a method for attaching to this hook 61.

In the figure, 71 is a steel wire, and 72 is an angle to which the steel wire 71 is attached. With the elevator in the position shown, the device consisting of 52 to 55 is attached to the hook 50 on the hoistway wall.

Next, put the mounting terminal 52 into the steel wire 71,
When the elevator is operated upward, it will be installed as shown in Figure 7.

Finally, one of the major features of the present invention is that the device is small and lightweight, making it convenient to carry.

That is, the rope 53 shown in FIG. 6 accounts for a large proportion of the weight of the apparatus of the present invention.

The cross-sectional area of this rope 53 is 20 kg, which is approximately 1/10 of the tensile strength of the steel wire that makes up the rope.
f/mm ² , it will be 20mm ² when the target is a 6-seater machine with a rated load of 380Kgf, which is installed in a relatively large number of units, and if the number of ropes is 4, it will be 1.
It can be seen that the book is sufficiently thin and lightweight at 5 mm ² .

According to the present invention, a load can be generated without using a conventional screw jack or the like, and the device can be a lightweight and easily portable device made of ropes, springs, etc.

It also has excellent workability because it can be operated from behind the ceiling of the car room.

Furthermore, it becomes possible to verify the unbalanced load compensator, which was not possible with conventional methods.

In addition, in the case of a DC gearless elevator or the like, the load can be measured by measuring the input current of the electric motor, and a load meter can be omitted.

[Brief explanation of the drawing]

Figure 1 is an overview of the elevator car, Figure 2 is a diagram showing the weighing device and continuous load detection device, Figures 3~
FIG. 5 shows a conventional method for applying a load to a cab, and FIG. 6 shows an example of a method for applying a load to a car according to the present invention. FIG. 7 shows another embodiment of the invention, and FIG. 8 shows an embodiment in which the apparatus of the invention is installed in the form shown in FIG. 1...Upper beam, 2...Main rope, 3...Vertical pillar,
4... Emergency stop, 5... Support frame, 6... Bracing,
7... Elastic body such as anti-vibration rubber, 8... Floor frame, 9...
Car room, 10... Weighing device, 11... Continuous load detection device, 20... Rod, 21... Spring, 22...
Washer, 23... Nut, 31... Rod, 32...
...Threaded part, 33... Load cell, 34... Holding plate, 3
5... Support plate, 41... Threaded portion, 42... Rod, 43... Support plate, 44... Load cell, 45...
Presser plate, 50...Hook, 51...Angle, 5
2... Attachment end, 53... Rope, 54...
Spring, 55... Load cell, 56... Weight for angle detection, 57... Safety fuse, 58... Combined load cell, 59... Operation panel for maintenance operation, 61...
Hook attached to the floor frame, 71... Steel wire, 72...
...Angle for attaching steel wire.

Claims (1)

[Claims] 1 A frame suspended by a main rope in the hoistway, an elastic body installed on this frame, and a chamber placed on the frame via the elastic body to compress the elastic body. a weighing device located between the cage and the frame and activated when the elastic body is compressed by a predetermined amount; and a hoisting machine driven by an electric motor for winding the main rope. In the elevator, the car and the wall of the hoistway are connected, and in this state, the electric motor is driven to lift the frame and create a relative displacement between the frame and the car. A method for applying a load to an elevator car, characterized in that the elastic body is compressively deformed.