JPH0733349A - Safety device for operation on elevator car - Google Patents

Abstract

PURPOSE:To provide a safety device for the operation on an elevator car capable of surely informing a worker of the approach of a balance weight during the operation on the car. CONSTITUTION:This safety device for the operation on a car 1 is provided with balance weight detecting devices 3b, 5, 7 detecting the prescribed distance at which the car 1 and a balance weight 2 pass each other and a crawling operation circuit (crawling travel speed command device 11 and crawling travel command relay 15) further decelerating the low speed operation when the balance weight detecting devices 3b, 5, 7 are operated during the low speed operation on the car 1.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Generally, each device in an elevator hoistway,
For maintenance and inspection of safety devices and the like, an operator rides on a car of an elevator, operates a driving operation switch on the car to move the car up and down, and stops the car as needed to perform inspection. At this time, when passing the counterweight and each device in the hoistway,
If the operator is driving the elevator without noticing that his body is protruding from the top of the car, he or she may be injured by the counterweight or equipment in the hoistway.
As described in JP-A-43870, a safety device during operation on a car detects a body protruding from a car by a detection device and outputs a warning, and a range where a balance weight is provided in a hoistway is constant. It has been proposed to provide a circuit for detecting and displaying the position inside by another detecting device.

[0003]

The above-mentioned safety device for driving on a car detects a body protruding from the car by a detection device and issues an alarm, and the operator notices the alarm and a driving operation switch. Was operated to stop the elevator. Therefore, when the external noise is large, there are problems that the alarm sound cannot be heard and the display is not noticed. Also, if the worker is concentrated on the work while traveling, or if the worker's attention is distracted by the simple work of simply driving the elevator on the car, the alarm sound may be missed or displayed. There was a problem that I did not notice.

SUMMARY OF THE INVENTION An object of the present invention is to provide a safety device for driving on an elevator car which can surely inform an operator when driving on a car that the counterweight is approaching.

[0005]

In order to achieve the above object, the present invention provides an elevator car having an alarm device for issuing an alarm when a car and a counterweight connected to each other via a main rope pass each other. In the safety device during upper operation, the balance weight detection device that detects a predetermined distance between the car and the balance weight and the balance weight detection device operates when the elevator is traveling at low speed on the car. And a fine speed operation circuit for further decelerating the low speed operation.

[0006]

With this structure, when the counterweight approaches while traveling at a low speed on the elevator car, the vehicle runs at a very low speed, which is a speed lower than the low speed. As a result, the worker can surely know the approach of the counterweight by switching the speed from the low speed to the very low speed, so that the safety of the worker during the car operation can be secured.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In the figure, a car 1 and a counterweight 2
Is wound around a sheave 3a connected to the motor 3 via a rope 4, and a rotary encoder 3b is attached to the rotary shaft of the motor 3 to output a pulse corresponding to rotation to a pulse counter 5. This pulse counter 5
Calculates the position of the car 1 by adjusting the pulse. Further, the motor 3 controls the rotation by the torque control means 6 such as which direction the operation is performed or how much the start compensation is performed.

The memory 7 connected to the pulse counter 5 sends a signal to the torque command generator 8 which commands the starting compensation value by observing the balance between the car 1 and the counterweight 2 when the torque control means 6 is started. The value of the pulse counter 5 for outputting or for storing the car 1 and the counterweight 2 adjacent to each other is stored in advance. Further, the torque control means 6
Is a normally closed contact 12 which will be described later by the steady running speed command device 9.
A low speed traveling speed command device 10 connected via b1 and used for traveling during maintenance work on a car or in a car is connected to a normally open contact 12a2 described later and a normally open contact 13a2 described later connected in parallel. A closed contact 13b1 and a normally-closed contact 15b1 described below are connected in series and connected to the torque control means 6, and the torque control means 6 sends a low speed traveling speed command via a normally-open contact 15a1 described later. Device 1
It is connected to a slow speed traveling speed command device 11 for traveling the car 1 at a speed half that of zero.

Further, as shown in FIG. 2, between the power supplies P and N,
Contact SW1 of a maintenance switch (not shown) provided in the car 1, normally open contacts 12a1, 12a2, and normally closed contact 12
b1 are connected in series. Similarly, the power source P-N
Contact SW2 of a not-shown car maintenance switch, which is a changeover switch provided on the car 1 for performing a low speed operation on the car, a normally open contact 12a1, and a normally open contact 13a.
1, 13a2 and an on-car operation switching relay 13 having a normally closed contact 13b1 are connected in series. Similarly, the normally open contact 13a1 between the power sources P and N and the normally open contact 14a of the not-shown counterweight adjoining detection relay that urges when the car 1 previously stored in the memory 7 is located at a predetermined position adjacent to the counterweight 2. And a slow speed command relay 15 having a normally open contact 15a1 and a normally closed contact 15b1 are connected in series.

Next, the operation will be described. Now the worker
When a maintenance switch (not shown) in the car 1 is operated, PS
W1-12-N circuit is formed and low speed operation command relay 1
2 urges and 10-12a2-13b1-15b1-6
The low speed operation is performed inside the car 1 by the circuit.

Further, when a not-shown car maintenance switch on the car 1 is operated, P-SW2-12a1-13-
The N circuit is formed, and the car operation switching relay 13 is energized, so that the circuit of 10-12a2-13a2-15b1-6 enables low speed operation on the car 1.

When the car 1 and the counterweight 2 which are stored in the memory 7 in advance are located adjacent to each other, the counterweight adjoining detection relay (not shown) is activated to close the normally open contact 14a. -13a1-14a-15-
The circuit of N is formed, the low speed travel command relay 15 is energized, the circuit of 10-12a2-13b1-15b1-6 is opened, and the circuit of 11-15a1-6 is formed instead. 1 is half the speed of low speed operation, and travels in a section previously stored in the memory 7.

[0014]

According to the present invention, when the counterweight approaches while traveling at a low speed on the elevator car, the vehicle runs at a slow speed which is lower than the low speed. With this, the operator can surely know the approach of the counterweight by switching the speed from the low speed to the low speed,
It is possible to ensure the safety of workers when operating on the car.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a safety device for operating an elevator car according to the present invention.

FIG. 2 is a car traveling speed switching circuit of the safety device of FIG.

[Explanation of symbols]

 1 basket 2 counterweight 3b rotary encoder 5 pulse counter 7 memory 11 speed command device for slow speed running 15 slow speed running command relay

Claims (1)

[Claims] Claim: What is claimed is: 1. In a safety device during operation on an elevator car, comprising: an alarm device for issuing an alarm when a car and a counterweight connected to each other via a main rope pass each other. A counterweight detection device that detects a predetermined distance, and a slow-speed operation circuit that further slows the low-speed operation while the elevator is traveling at low speed on the car while the counterweight detection device is operating. A safety device when operating on an elevator car, characterized by being equipped with.