JPH05278965A - Elevator cage load detector - Google Patents

Abstract

PURPOSE:To reduce an installation space by forming one elastic body in a hollow structure, and enclosing the other elastic body therein in an elevator cage load detector to detect a change of a load in a cage according to the bending of these elastic bodies while interposing a plurality of the two-kind elastic bodies under the cage. CONSTITUTION:In an elevator cage load detector, a cage support device 50 is interposed between a cage floor receiving frame 3 and a cage floor 7, and this displaces flexibly according to a load in a cage 11, and thereby, a light load applying switch 10A and a heavy load applying switch 10B are operated in order by respective operation parts 9A and 9B of an actuator 8. In this case, the cage support device 50 is composed of a rubber vibration isolator 50a having a hollow part and a rubber vibration isolator 50b which is arranged in such a shape as being enclosed in the hollow part and has a clearance between it and the floor receiving frame 3 so as not to operate when a light load is applied, and a spring constant of the rubber vibration isolator 50a is set small, on the one hand, a spring constant of the rubber vibration isolator 50b is set large. Thereby, an installation space of the cage support device 50 can be reduced, and high detecting accuracy can be also obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load detecting device for detecting a load on an elevator car.

[0002]

2. Description of the Related Art First, a conventional load detecting device will be described with reference to FIG.

The car frame 1 of the elevator car is the hoisting rope 2.
Is suspended by the bottom beam of the car frame 1,
A floor support frame 3 is provided, and an anti-vibration rubber (spring) 6 is provided above it.
The car floor 7 is supported via. A car side wall 4 is provided on the car floor 7, and a ceiling wall is mounted on the side wall 4. An actuator 8 is provided on the lower surface of the car floor 7, and the actuator 8 has actuating portions 9A and 9B whose vertical positions are different from each other. 10B is attached. The switch 10A is a switch that operates under a light load, and the switch 10B is a switch that operates under a heavy load. The switches 10A and 10B are connected to a control device (not shown). The light load switch 10A is provided to prevent unnecessary movement of the elevator when a large number of destination floor registration buttons in the car 11 are pressed by mischief. That is, when a predetermined number or more of destination floor registration buttons are registered when the number of people in the car 11 is small (the switch 10A is not operating), a control device (not shown) determines that the call is a prank call and the destination floor All registrations are canceled and unnecessary movement of the elevator is prevented.

The heavy load switch 10B stops the operation of the elevator when the load of the car exceeds the allowable load weight,
It is used to ring a buzzer that informs a person in the car 11 that he / she is overriding.

The function of the conventional load detecting device as described above will be described with reference to the characteristic graph of FIG.

In the figure, the horizontal axis is the load (k) in the car 11.
g), and the vertical axis shows the amount of flexure of the anti-vibration rubber 6 (in the drawing, the spring constant is entered as 100 kg / mm) in a load-deflection diagram L.

From the figure, when the load is 500 kg, the switch 1 is set so that the detection load range a is within an error range of ± 10%.
When 0B is installed, as shown in the deflection range b, 5 mm ±
Installation accuracy within 0.5 mm is required. When the light load operating point of the switch 10A is set to 50 kg with such installation accuracy, the load detection error range becomes 0 kg to 100 kg as shown by C in the figure, and only ± 100% detection accuracy is obtained for 50 kg. Detection accuracy at light load is ± 10
The switch 10A having the deflection range d in order to obtain
It is necessary to make the installation accuracy of 10 times or more (0.5 mm ± 0.005) of the installation accuracy of the switch 10B, and the installation position adjusting mechanism becomes very complicated and expensive. Further, since the anti-vibration rubber 6 itself has hysteresis, it is difficult to improve the overall accuracy even if a high-precision switch is used.

Further, the spring constant of the anti-vibration rubber 6 is lowered,
There is also a method to increase the amount of flexure and improve the apparent accuracy, but since the product of the car and the level difference in the sky become large and it becomes a very dangerous state when getting on and off the car, lower the spring constant. There is a limit to that.

On the other hand, there is a method of improving the load-deflection characteristic by using two kinds of springs having different spring constants (Japanese Patent Publication No. 2-41506).

This is to arrange a plurality of anti-vibration rubbers having different characteristics in parallel or in series, which will be described with reference to FIGS. 5, 6 and 8.

FIG. 5 is a view in which different types of spring characteristics are arranged in parallel, and vibration isolating rubbers (springs) 6A and 6B are arranged in parallel between the floor receiving frame 3 mounted on the car frame 1 and the car floor 7. To place. The configurations of the actuator 8, the operating portions 9A and 9B, and the switches 10A and 10B are the same as those in the above-described example.

The operation of the detection device having such a configuration will be described with reference to FIGS.

When the load is light, first, the vibration-proof rubber 6A having a low spring constant has a raised characteristic as shown in the load-deflection diagram e of FIG. 8, and a large deflection can be obtained even with a slight load. When a certain load is reached, the vibration-proof rubber 6B having a high spring constant (the characteristic of the load-deflection line f of FIG. 8) bends, and the combined characteristics of the two types of vibration-proof rubber (the load-deflection line diagram of FIG. 8). L2).

For example, the amount of flexure of the anti-vibration rubber 6A is 2.78.
When the vibration reaches 6 mm, the rubber vibration isolator 6B begins to come into contact with the composite load-deflection curve L2.
If a deflection of mm can be obtained, the detection error range a under heavy load in FIG. 4 can be obtained. On the other hand, when the load is light, if the switch 10A is installed as shown in the range d, the switch 10A
The load detection range c is 45 to 55 kg, and a detection accuracy of ± 10% can be obtained for 50 kg.

FIG. 6 shows an anti-vibration rubber 6 having different spring characteristics.
D and 6E are arranged in series, and a characteristic graph at that time is shown in FIG.

In the figure, two types of anti-vibration rubbers 6D and 6E having different spring constants are installed in series between the floor plate 7 and the floor receiving frame 3, and a stopper 6C is interposed between the anti-vibration rubbers. I'm sorry. In such a structure, when a load acts on the car 11, the vibration isolator 6D first hits the flexure (for light load) stopper 6C, and then the heavy antivibration rubber 6E flexes. This state is shown in FIG.

For example, the spring constant of the anti-vibration rubber 6D is set to 22.2.
Anti-vibration rubber, spring constant of 6E is 200 kg
/ Mm, both anti-vibration rubbers 6D and 6E will flex under light load (composite spring constant at this time is 20kg / mm)
It is shown in Figure L3. After that, the car floor 7 hits the stopper 6C, and thereafter, only the vibration-proof rubber 6E bends. By using such a load-deflection diagram, the same operation and effect as described in FIG. 5 can be obtained.

[0018]

However, in the case of FIG. 5, different types of anti-vibration rubbers 6A and 6B are separately arranged in parallel, so that a wide space on the plane is required and the structure is limited. Is difficult to attach, and there are drawbacks such as an increase in weight when additional members are added.

Further, in the case of the structure shown in FIG. 6, since different kinds of anti-vibration rubbers 6D and 6E are stacked in series, the floor receiving frame 3
Then, there are drawbacks such that the size of the car floor 7 in the height direction becomes large, the height of the entire car becomes high, and the influence on the hoistway becomes large.

In order to solve the above-mentioned problems, the present invention can be constructed with a flat space and height which are substantially the same as those when using one type of conventional anti-vibration rubber in terms of space and light load. The present invention provides a load detection device for an elevator car, which can ensure detection accuracy under heavy load.

[0021]

[Means for Solving the Problems]
The main body of the light load anti-vibration rubber is configured to be hollow, and the heavy load anti-vibration rubber is built in the hollow portion of the light load anti-vibration rubber to reduce the space required for the two types of elastic bodies.

[0022]

With this configuration, when a light load is applied to the car, the light load anti-vibration rubber interposed between the car floor and the floor receiving frame is bent, and the actuator further operates the switch. As the load increases, the anti-vibration rubber for heavy loads also acts, and both light and heavy loads act and detect according to the load-deflection characteristics that match the composite spring constant, and the switch is activated by the actuator to detect heavy load. Becomes

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described based on the embodiments shown in FIGS.

A car support device 50 is interposed between the car floor receiving frame 3 and the car floor 7 so as to bend in accordance with the load in the car 11. The structure of the car support device 50 comprises a vibration isolating rubber 50a having a hollow portion and a vibration isolating rubber 50b having a clearance between the floor supporting frame 3 and the hollow vibration isolating rubber 50a so as not to act under a light load. To provide.

The anti-vibration rubber 50A has a small spring constant and the anti-vibration rubber 50b has a large spring constant.

With this construction, the car floor 7 is supported by the anti-vibration rubber 50a when no load is applied, and the car floor 7 bends as the load increases. Eventually, the anti-vibration rubber 50B hits the floor receiving frame, and the anti-vibration rubber 50a and 50b will bend simultaneously.

In this case, the characteristics shown in FIG. 8 can be obtained by appropriately selecting the spring constants of the anti-vibration rubbers 50a and 50b.

Another embodiment of the present invention will be described with reference to FIG.

In the figure, an anti-vibration rubber 51a is attached to the car floor 7 and is integrally connected to an anti-vibration rubber 51b having a space 52. One end of the anti-vibration rubber 51B is provided with an integrated clearance with the car floor 7, and the other end is attached to the floor receiving frame 3 with a bolt or the like.

The operation in this case has the same characteristics as those obtained in FIG.

[0031]

With the above configuration and operation, two types of anti-vibration rubbers used for load detection of light load and heavy load are provided in one main body, and the other anti-vibration rubber is built in the hollow part. As a result, the overall mounting space can be reduced to the same level as conventional heavy vibration-proof rubber.

A load-deflection diagram having the same characteristics as those in FIGS. 5 and 8 can be obtained.

Thus, it is possible to provide the load detection of the elevator having a good space factor and a high detection accuracy.

[Brief description of drawings]

1 is a front view of an elevator car according to the invention, FIG.

FIG. 2 is a partial detailed view of FIG.

3 is an equivalent view of FIG. 2 according to another embodiment of the present invention,

FIG. 4 is a front view of a car using a conventional load detection device (using one type of spring),

FIG. 5 is a front view of a car using a conventional load detection device (using two types of springs).

FIG. 6 is a partial front view of a car according to another embodiment of the related art,

FIG. 7 is a load-deflection characteristic diagram of load detection using one type of conventional spring,

FIG. 8 is a load-deflection characteristic diagram of load detection by two types of springs,

FIG. 9 is a load-deflection diagram by two types of springs arranged in series.

[Explanation of symbols]

 1 ... Car frame 2 ... Hoisting rope 3 ... Floor support frame 6a, 6b, 6D, 6E, 50a, 50b, 51a, 51b ... Spring (rubber) 7 ... Car floor 9A, 9B ... Operating part 10A, 10B ... Switch

Claims (1)

[Claims] 1. An elevator having two different spring constants under a car.
In a load detection device for an elevator car, in which a plurality of types of elastic bodies are interposed, and a change in the load of the car is detected according to the bending of the elastic bodies due to the load of the car, one of the two types of elastic bodies A load detecting device for an elevator car, characterized in that an elastic body is made hollow and another elastic body is built in this hollow portion.