JPH05213567A - Braking device for elevator - Google Patents

Abstract

PURPOSE:To provide an elevator braking device of high reliability and safety by detecting static force between a brake drum and a brake shoe in the final stage so as to utilize the existence of static force as an elevator control signal. CONSTITUTION:Pressure between the brake drum 5 and brake shoe 8 of an elevator is detected by a pressure sensor 13 to check consistency between an action command to a brake coil 10 and the detection result of the pressure sensor 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator braking device.

[0002]

2. Description of the Related Art In a conventional elevator braking apparatus, FIG. 2 shows the entire structure of the elevator, and FIG. 3 shows only the brake section in an enlarged manner. Elevator car 1
Is connected to the counterweight 3 via the wire rope 2.

A motor 4 rotates a sheave 6 via a coupling 5 by means of a rotational force, and utilizes a frictional force between the sheave and the rope 2 to move the elevator car 1 up and down. The rotating force to the motor 4 is controlled by the control panel 7 and given.

When the elevator is stationary or in the absence of a power source, there is naturally no rotational force of the motor 4 and a mechanical stopping force is required. This mechanical holding device is called a braking device.

In general, a brake shoe 8 made of a material having a high friction coefficient is pressed against a coupling (hereinafter referred to as a brake drum) 5 between a motor 4 and a sheave 6 by a force of a brake spring 9 to obtain a static force. This static force is legally defined and must have a static force of at least 150% of the elevator rated load. When the elevator runs, it is necessary to have a function to remove the static force of the brake device. Generally, the brake coil is instructed by a command from the control panel 7.
A method of applying an electric current to 10 and generating an electromagnetic force that overcomes the force of the brake spring 9 is adopted.

Conventionally, the presence / absence of a static force is determined based on the presence / absence of an electromagnetic force generation command from the control panel 7, and when it is determined that the static force is lost, an elevator running command is output to the motor 4. .. However, when the electric wire up to the brake coil 10 is cut, a running command may be output while the static force remains, and there is a risk of a serious accident such as burnout of the motor 4. Assuming such a case, a method of detecting the movement of the brake lever 11 which moves due to the electromagnetic force of the brake coil 10 by the switch 12 and feeding it back to the control panel 7 as a confirmation signal of the presence or absence of the static force recently. Has been adopted.

[0007]

However, in the conventional detection method as described above, even when the brake lever is operated, a static force may remain between the brake shoe and the brake drum, and an erroneous detection signal is sent to the control panel. Could have been sent. The reason is that in order to generate an electromagnetic force stronger than the static force of the brake spring by the brake coil,
It is difficult to operate a large distance. In addition, since the gap between the brake shoe and the brake drum during traveling should be about 0.3 to 0.5 mm, the movement of the brake lever is small and it is difficult to obtain a reliable movement.

Therefore, an object of the present invention is to detect the presence / absence of a static force, which is the final stage, to detect the static force between the brake shoe and the brake drum, and use it as a signal for elevator control, thereby ensuring safety and reliability. It is to provide a high elevator braking system.

[0009]

In order to achieve the above object, the present invention provides a brake drum that rotates in conjunction with a hoisting motor of an elevator, and a brake that comes into contact with the brake drum to apply rotational braking. A shoe, a brake spring that presses the brake shoe and the brake drum into contact with each other, a brake coil that generates a force that opposes the pressing force of the brake spring when the elevator starts or runs, and a brake coil that is added to the brake shoe. Provided is an elevator brake device including a pressure sensor that detects a pressure from the brake drum, and a control panel that determines an operation command to the brake coil and a detection result from the pressure sensor.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Here, the same portions as those of the conventional configuration will be denoted by the same reference numerals and will be described. FIG. 1 is a schematic diagram showing the configuration of the brake device of the present invention.

In FIG. 1, the brake device is a motor 4
Brake drum 5 that rotates in conjunction with, and brake shoe 8 that is provided on brake lever 11 to keep brake drum 5 stationary, and force is applied to brake lever 11,
A brake spring 9 for generating a static force between the brake drum 5 and the brake shoe 8 and a force that opposes the brake spring 9 based on a command from the control board 7 are generated, so that a space between the brake drum 5 and the brake shoe 8 is generated. It comprises a brake coil 10 for releasing the static force, and a pressure sensor 13 provided inside the brake drum 5 and the brake shoe 8 for detecting the static force. Next, the operation of the brake device will be described.

When the elevator is started, the control panel 7
The current to the brake coil 10 is cut off by a start command from the brake coil 9, and the brake spring 9 pushes the brake lever 11. When the brake lever 11 is pushed by the brake spring 9, a gap is created between the brake shoe 8 provided on the brake lever 11 and the brake drum 5 connected to the motor 4, and the static force is released. At this time, the pressure sensor 13 determines that there is no static force, and the control panel 7 determines that it can be activated. On the contrary, when the elevator is stopped, a current is supplied to the brake coil 10 by a stop command from the control panel 7, and the brake spring 9 is pushed back to push the brake lever 11. When the brake lever 11 is pushed, the brake shoe 8 and the brake drum 5 come into contact with each other, and a static force is generated. At this time, the pressure sensor 13
Detects the pressing force between the brake shoe 8 and the brake drum 5, and determines that there is a static force, and the control panel 7 determines whether or not to stop.

Here, when the command to the brake coil 10 of the control panel 7 and the detection result from the pressure sensor 13 are not consistent, the control panel 7 monitors by an alarm or the like that the brake operation is abnormal. Staff or maintenance personnel.

Since the pressure sensor 13 is provided to detect the pressing force between the brake shoe 8 and the brake drum 5 as described above, the presence / absence of a static force can be reliably determined. The brake release can be surely judged, and conversely, the brake operation can be surely judged when the elevator is stopped, so that safe traveling can be performed. Further, it can be used as a particularly reliable judgment means when inspecting the elevator.

[0015]

As described above, according to the present invention, the presence or absence of the static force of the elevator can be detected in the final stage, so that a safer and more reliable elevator braking device can be provided.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a brake device of the present invention.

FIG. 2 is an overall system diagram of a conventional brake device.

FIG. 3 is a schematic configuration diagram of a conventional brake device.

[Explanation of symbols]

4 ... motor, 5 ... brake drum, 7 ... control panel, 8 ...
Brake shoe, 9 ... Brake spring, 10 ... Brake coil, 13 ... Pressure sensor

Claims (1)

[Claims] 1. A brake drum that rotates in conjunction with a hoisting motor of an elevator, a brake shoe that comes into contact with the brake drum to apply rotational braking, and a brake that presses the brake shoe into contact with the brake drum. A spring, a brake coil that generates a force that opposes the pressing force of the brake spring when the elevator is started or travels, a pressure sensor that detects the pressure applied to the brake shoe from the brake drum, and the brake coil. An elevator braking device comprising an operation command and a control panel for judging a detection result from the pressure sensor.