JPH04109977U - Safety devices in elevators - Google Patents

Abstract

(57) [Summary] (with amendments) [Purpose] To easily and accurately detect overload of elevators and escalators during construction work, to issue a warning in the event of overload to improve safety, and to provide power supply for control circuits. Aim to save labor in the department. [Structure] A control circuit 1 that configures a bridge circuit by attaching strain gauges 9 and 9a to all sides of the back surface of the bottom plate of the cage 3, and calculates the load weight using the unbalanced output of the bridge circuit.
5, and the DC power supply is turned off after a certain value of the loaded weight.
Provide an automatic power recovery circuit that turns on and off.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention improves safety by detecting overload of elevators during construction work using a simple mechanism. This invention relates to safety devices in elevators that improve safety.

0002

[Conventional technology]

Traditionally, lead elevators were used for lifting and lowering personnel and equipment to high places during construction work. Installed in elevators that control the raising and lowering of cages in a direct space, or in truck beds. Although there are condors installed at the tip of the boom that swings up and down, such lifting and lowering The aircraft is not equipped with a simple payload detection device, and therefore a large number of personnel and equipment cannot be used. It was extremely dangerous if loaded.

0003

[Problem that the idea aims to solve]

This invention enables simple and accurate detection of the weight of personnel, equipment, etc. inside the cage, and Elevator that issues a warning when a load is applied, improves safety, and saves labor in the power supply section of the control circuit. The aim is to provide safety equipment during disembarkation.

0004

[Means to solve the problem]

This invention is based on the above conventional technology and is not equipped with a load weight detection device. In view of the danger of this problem, we have installed stress on the back of the bottom plate on which personnel and equipment such as cages are directly placed. In elevators that are equipped with safety devices consisting of in-gauges to improve safety. The purpose of this invention is to provide a safety device that eliminates the above-mentioned drawbacks.

[0005] As a safety device for elevators, there are Configure a bridge circuit by pasting strain gauges on all sides of the bottom plate of the gauge, and A control circuit is provided to calculate the loaded weight using the unbalanced output of the bridge circuit.

[0006] In addition, other safety devices include , automatic power return circuit that controls the DC power supply on and off after a certain value of loaded weight. Set up a road.

[0007]

[Effect]

In this invention, the bottom plate of the cage rises due to the weight of people, equipment, etc. on the bottom plate of the cage. Complain the bridge circuit composed of strain gauges by flexing downwards. This change is calculated as the load weight by the control circuit, and the automatic power return circuit The power supply unit is controlled to turn on and off at a certain value of the load applied to the bottom plate.

[0008]

【Example】

An embodiment of the present invention will be described below based on the drawings. Reference numeral 1 indicates an elevator according to the present invention, and the elevator 1 is an elevator that is a vertically elongated space. A cage 3 is arranged in elevator hall 2 so that it can be raised and lowered freely, and A cable 5 is hung on a hoisting machine 4 provided at the top, and a cage 3 is attached to one end and a loose piece is attached to the other end. The cage 3 is controlled to move up and down through the operation of the hoisting machine 4.

[0009] Incidentally, the basic configuration of the elevator 1 is not limited to the above embodiment, and for example, a truck (Fig. A gondola (not shown) is attached to the tip of a boom (not shown) installed on the cargo platform (not shown). The gondola may be raised and lowered by swinging the boom.

0010 7 is a safety device, and the safety device 7 is a metal device on which the personnel, equipment, etc. of the cage 3 are directly placed. Strain gauges are installed on all sides of the back side of the bottom plate 8 (corresponding to the corners of the square as appropriate). 9, 9a... to form a bridge circuit 10, and input terminals 11, 9a of the bridge circuit 10, Connect the power supply unit 12 that applies DC voltage to 11a, and connect the bridge to output terminals 13 and 13a. Appropriate application that calculates the output value according to the unbalanced state of circuit 10 to the loaded weight of personnel, equipment, etc. A control circuit 15 having an amplifier circuit 14 is connected thereto.

[0011] In addition, as the power supply unit 12, AC100V, AC200V, DC12V, DC12 4 V power supply, especially when using DC power supply, the bridge circuit 10 If the detected loaded weight is less than a certain value (10 kg or less in this example), Turns off the DC power supply, and turns it on when the above certain value is exceeded. An automatic power return circuit 16 is provided.

0012 Next, we will explain the operation of the safety device in the elevator according to the present invention. The bottom plate 8 of the cage 3 may slightly move vertically due to the weight of personnel, equipment, etc. placed on the bottom plate 8. By bending, the resistance value of strain gauges 9, 9a... changes, and Accordingly, the bridge circuit 10 becomes unbalanced, and this change is controlled via the amplifier circuit 14. input to the circuit 15, and the control circuit 15 activates an alarm device (not shown) as appropriate. It gives a warning.

[0013] In addition, if the load applied to the bottom plate 8 is below a certain value by the power automatic return circuit 16, the power is turned off. Power source 12 is turned off to reduce consumption of the DC power supply.

[0014]

[Effect of the idea]

In short, the present invention is based on the back surface of the bottom plate 8 of the cage 3 that is disposed in the elevator A bridge circuit 10 is constructed by pasting strain gauges 9, 9a... on all sides, and the bridge A control circuit 15 is provided to calculate the load weight using the unbalanced output of the cage circuit 10. 3, the bottom plate 8 bends in the vertical direction due to the weight of personnel, equipment, etc. placed on the bottom plate 8. Therefore, the bridge circuit 10 composed of strain gauges 9, 9a... is made unbalanced, The control circuit 15 calculates this change to the loaded weight, and if the loaded weight is overloaded, If the entire bottom plate 8 is bent, a warning can be issued to ensure safety. By detecting the uneven load of personnel, equipment, etc. can also be detected accurately.

[0015] In addition, in the control circuit 15 having the power supply unit 12 which is a DC power supply, a fixed value of the loaded weight An automatic power return circuit 16 is installed to control the DC power supply ON/OFF based on the Eliminate power consumption when the elevator 1 is not in use, and connect the control circuit 15 only when it is in use. Its practical effects are enormous, such as reducing the power consumption of the power supply unit 12 by operating it. It is.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view of an elevator according to the present invention.

FIG. 2 is a circuit diagram of a safety device.

FIG. 3 is a schematic perspective view of the cage.

FIG. 4 is a partial cross-sectional view of a location where the bottom plate of the cage is attached.

[Explanation of symbols]

1 Elevator 3 Cage 8 Bottom plate 9, 9a... Strain gauge 10 bridge circuit 15 Control circuit 16 Power automatic recovery circuit

Claims (2)

[Scope of utility model registration request] [Claim 1] A control circuit that configures a bridge circuit by attaching strain gauges to all sides of the bottom plate of a cage that is disposed in an elevator so that it can be raised and lowered, and calculates the loaded weight using the unbalanced output of the bridge circuit. A safety device for an elevator, characterized by being provided with. [Claim 2] In a control circuit having a power supply unit that is a DC power source, the DC power source is turned on when the load weight reaches a certain value.
- The safety device for an elevator according to claim 1, further comprising an automatic power return circuit for OFF control.