JPH07101644A - Safety device of elevator - Google Patents

Abstract

PURPOSE:To securely prevent mechanics on a car from colliding with a balance weight. CONSTITUTION:A safety device is provided with a detector 11 which detects a car 1 approaching a balance weight 2 when it vertically moves at -low speed by the operation of a controller on the car 1, a low speed traveling stop relay 13 to stop the car 11 by turning off it in accordance with the action of detector 11 to open a usually opened contact 13a, and a restarter 12 to start again the car 1 stopped in accordance with turning-off the low speed traveling stop relay 13. When mechanics on the car 1 approach the balance weight 3, the cage 1 is automatically forced to stop to call their attention. And thereafter, the mechanics restarts the car 1 by the restarter 12.

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 an elevator, which is provided in an elevator having a car upper operation means on an upper part of a car and includes a detecting means for detecting that the car approaches a counterweight.

[0002]

2. Description of the Related Art Generally, in an elevator, an operator gets on a car at the time of maintenance and inspection, and operates a car upper operation means installed at the top of the car to move the car up and down at a low speed It is designed to perform maintenance and inspection of each device and safety device. When the worker does not notice that the above-mentioned worker's body is protruding from the upper part of the car to the side and passes by the counterweight and each device in the hoistway, they are injured by these counterweights and each device in the hoistway. There was a concern.

Therefore, in the past, for example, Japanese Utility Model Laid-Open No. 56-4387 is used.
As described in Japanese Patent Publication No. 0, a protrusion detecting means for detecting the protrusion of the human body laterally from the upper part of the car;
An alarm means for outputting an alarm in response to the detection of the protrusion detecting means, a position detecting means for detecting that the counterweight is located within a predetermined range in the hoistway, and a display means for displaying the detection result of the position detecting means. An elevator safety device provided with and has been proposed.

In this conventional safety device, when the worker's body sticks out from the upper part of the car to the side, an alarm is output from the alarm means in response to the detection of the sticking-out detection means. By hearing this warning sound, he was aware of the danger and returned his body to the top of the car. When the counterweight is located within a predetermined range within the hoistway, the detection result of the position detection means is displayed on the display means,
The worker was to detect the danger by looking at this display.

[0005]

However, the above-mentioned conventional elevator safety device has a problem that the alarm sound output from the alarm means cannot be heard when the ambient noise is large. Also, if the worker on the car is concentrated on the work, or if the worker's attention is distracted due to some reason, he / she may not hear the warning sound,
There is a problem that the display of the display means is not noticed. That is, it has been difficult to prevent a collision with a counterweight of an operator.

The present invention has been made in view of the actual situation in the prior art, and an object thereof is to provide an elevator safety device capable of reliably preventing an accident in which a worker on a car collides with a counterweight. To provide.

[0007]

In order to achieve this object, the present invention provides a car and a counterweight which respectively move up and down in a hoistway, and a car upper part which is installed on an upper part of the car and carries out a driving operation of the car. An elevator safety device provided with an elevator having an operating means, including a detecting means for detecting that the car moves up and down at a low speed by the operation of the car upper operating means and approaches the counterweight, A car stop means for stopping the car in response to the detection and a restart means for restarting the car stopped by the operation of the car stop means are provided.

[0008]

Since the present invention is configured as described above, when the operator gets into the upper part of the car during maintenance and inspection, and the car is moved up and down at a low speed by the operation of the car upper operation means to approach the counterweight, the detection means is detected. The car stopping means is activated in response to the detection of, and as a result, the car is stopped. Then, the operator operates the restarting means to restart the car. As a result, the car automatically stops before the workers on the top of the car pass each other with the counterweight, and at this time the worker can change the work position and work posture on the top of the car. Accidents in which the worker collides with the counterweight can be reliably prevented.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an elevator safety device according to the present invention will be described below with reference to the drawings. 1 is a block diagram of an elevator equipped with an embodiment of the safety device of the present invention, and FIG. 2 is FIG.
FIG. 3 is an electric circuit diagram showing the main configuration of the elevator of FIG.
6 is a flowchart for explaining a processing procedure for controlling the operation of the car by the safety device of FIG.

In general, an elevator is, as shown in FIG.
A car 1 and a counterweight 2, which respectively move up and down in a hoistway (not shown), an electric motor 3 for driving the car 1 and the counterweight 2, and a sheave 3a of the electric motor 3, which are wound around the car 1 and the counterweight. Two
And a control means 5 for controlling the electric motor 3.

The control means 5 is connected to the pulse counter 5a for detecting the position of the car 1 in the hoistway, the torque control means 6 for outputting a rotation control command to the electric motor 3, and the pulse counter 5a. , A memory 7 in which the car 1 stores in advance pulse counter values and the like corresponding to the deceleration start position of each floor, a torque command generator 8 connected to the memory 7 and the torque control means 6, and the torque control means. 6, a steady traveling speed command device 9 for outputting a steady traveling speed command, and a low speed traveling speed command device 10 for connecting to the torque control means 6 and outputting a low speed traveling speed command. Is equipped with.

A rotary encoder 3b is mounted on the electric motor 3, and a pulse signal is sent from the rotary encoder 3b to a pulse counter 5a according to the rotation of the electric motor 3.
Is output to. Then, the position of the car 1 in the hoistway is calculated by the pulse counter 5a based on the pulse signal.

A normally open contact 15a and a normally closed contact 17b are interposed between the torque control means 6 and the steady traveling speed command device 9. A normally open contact 17 is provided between the torque control means 6 and the low speed traveling speed command device 10.
a, a normally-closed contact 15b, a normally-open contact 19a, and a normally-open contact 13a are provided, and a normally-open contact 21a is connected in parallel to the normally-open contact 19a.

In the car 1, as shown in FIG.
A steady low-speed changeover switch 14 having a first output terminal 14a, a second output terminal 14b, and an input terminal 14c is provided, and a steady running relay 15 is connected to the first output terminal 14a, and a second running relay 15 is provided. An on-car low speed relay 17 is connected to the output terminal 14b via a low speed switch 16a provided on the car 1.

On the other hand, above the car 1, the low speed switch 16a, the low speed raising switch 18a to which the low speed raising relay 19 is connected, the low speed lowering switch 20a to which the low speed lowering relay 21 is connected, and the safety relay 23 are provided. A safety switch 22 to be connected is provided. These switches 16a, 18a, 20a, 22 constitute a car upper operation means 16 which is installed on the upper part of the car 1 and operates the car 1.

In such an elevator, when the car 1 approaches the destination floor, the memory 7 stores the pulse counter value corresponding to the deceleration start position of each floor in advance. Command generator 8
The output signal is transmitted to. Further, the torque control means 6 controls the electric motor 3 according to an output signal transmitted from any of the pulse counter 5a, the torque command generator 8, the steady travel speed command device 9, and the low speed travel speed command device 10. A rotation control command related to the rotation direction, start compensation, output of a deceleration command, etc. is output.

As shown in FIG. 1, the safety device of the present embodiment includes a detecting means 11 for detecting that the car 1 is moved up and down at a low speed by the operation of the car upper operation means 16 and approaches the counterweight 2. , A car stopping means for stopping the car 1 in response to the detection of the detecting means 11, for example, the low speed traveling stop relay 13 and the normally open contact 13a, and a restart for restarting the car 1 stopped by the operation of the car stopping means. The starting means 12 is provided.

The detection means 11 includes the memory 7,
It comprises a torque command generator 8 and a counterweight position detection circuit 11a. When the car 1 approaches the counterweight 2, an output signal is transmitted from the memory 7 to the torque command generator 8, and when traveling at low speed, an output signal is output from the torque command generator 8 to the counterbalance position detection circuit 11a. Sent.

The restarting means 12 is constituted by the normally closed contact 23b shown in FIG. 2 which is opened by energizing the safety switch 22, the restart relay 24 connected to the normally closed contact 23b, and the restart relay 24. Normally open contact 24a closed by the bias of
And an RS flip-flop circuit 12a connected to the normally open contact 24a and the counterweight position detecting circuit 11a, and a transistor Tr connected to the output terminal Q of the RS flip-flop circuit 12a. The normally open contact 24a is connected to the power supply Vcc and also connected to the power supply GN via the resistor r1. The low-speed traveling stop relay 13 is connected to the collector side of the transistor Tr, and the power source GN is connected to the emitter side.
Is connected in between.

The counterweight position detecting circuit 11a described above.
As the output signal is transmitted to the balance weight position detection circuit 11a, the detection signal is input to the set terminal S of the RS flip-flop circuit 12a. With this,
The RS flip-flop circuit 12a switches the signal value output from the output terminal Q from "1" to "0". afterwards,
When a reset signal is input to the reset terminal R of the RS flip-flop circuit 12a due to the closing of the normally open contact 24a, the RS flip-flop circuit 12a changes the signal value output from the output terminal Q from "0". Switch to "1". The signal output from the output terminal Q is amplified by the transistor Tr, and then the low speed traveling stop relay 13
Entered in.

In this embodiment, the car 1 is started, stopped and restarted in accordance with the procedure shown in FIG. That is, first, as a procedure S1, the worker at the time of maintenance inspection checks the steady low-speed changeover switch 1 in the car 1.
4 from the first output terminal 14a side to the second output terminal 14b
After switching to the side, get on the car 1 and set the car low speed switch 1 of the car upper operation means 16 installed on the car 1
When 6a is turned on, the circuit of power supply P-input terminal 14c-steady low-speed changeover switch 14-second output terminal 14b-car low-speed switch 16a-car low-speed relay 17-power N is closed, In step S2, the low car relay 17 is energized to open the normally closed contact 17b and close the normally open contact 17a. As step S3, the low speed rise switch 18
When a is operated, the circuit of power supply P-low speed increase switch 18a-low speed increase relay 19-power supply N is closed, so in step S4 the low speed increase relay 19 is energized to close the normally open contact 19a, Low speed traveling speed command circuit 10-
Since the circuit of normally open contact 17a-normally closed contact 15b-normally open contact 19a-normally open contact 13a-torque control means 6 is closed, the torque control means 6 outputs a low speed increase command to the electric motor 3. As a result, in step S5, the car 1 is driven at a low speed by driving the electric motor 3.

Then, in step S6, when the car 1 approaches the counterweight 2, the output signal from the memory 7 is output from the torque command generator 8 based on the information stored in advance.
And the output signal from the torque command generator 8 is balanced because the car 1 is operating at a low speed by the operation of the car upper operation means 16.
Sent to. Accordingly, in step S7, the detection signal is input from the counterweight position detection circuit 11a to the set terminal S of the RS flip-flop circuit 12a, so that the signal value output from the output terminal Q of the RS flip-flop circuit 12a is "1." From "" to "0". As a result, the transistor Tr is turned off and the power source Vcc-low speed traveling stop relay 13-transistor Tr-resistor r2-power source G.
Since the N circuit is opened, the low speed traveling stop relay 13
Is deenergized, the normally-open contact 13a is opened, and the electric motor 3 and the car 1 are stopped in step S8.

Next, in step S9, the safety switch 22
When the power is turned off and then turned on again, the safety relay 23 is deenergized and the normally-closed contact 23b is closed and the power source P-
Since the circuit of normally closed contact 23b-restart relay 24-power supply N is closed, the restart relay 24 is energized, the normally open contact 24a is closed, and the power supply Vcc-normally open contact 24a-RS.
The circuit of the flip-flop circuit 12a is closed. Along with this, a reset signal is input to the reset terminal R, so that the signal value output from the output terminal Q of the RS flip-flop circuit 12a switches from "0" to "1". As a result, the transistor Tr is turned on and the power source Vcc-low speed traveling stop relay 13-transistor Tr-resistor r2-power source G
Since the N circuit is closed, the low speed running stop relay 13 is energized and the normally open contact 13a is closed in step S11. Therefore, in step S12, the low speed increase switch 18a
Is operated again, the normally open contact 19a is closed due to the urging of the low speed rising relay 19, and as a result, the car 1
Is rising again at a low speed.

In the embodiment constructed as described above, the operator above the car 1 approaches the counterweight 2 and the car 1 automatically stops immediately before passing each other.
It is possible to correct the work position and work posture at the upper part, that is, it is possible to reliably prevent an accident in which the worker on the car 1 collides with the counterweight 2.

In this embodiment, the low speed rising switch 18
Although the case where the car 1 is raised at a low speed by the operation of a is illustrated, the same is true when the car 1 is lowered at a low speed by operating the low speed lowering switch 20a instead of the operation of the low speed raising switch 18a.

[0026]

Since the present invention is configured as described above, the operator at the top of the car approaches the counterweight and the car automatically stops immediately before passing each other. Therefore, it is possible to reliably prevent an accident in which the worker on the upper part of the car collides with the counterweight. Therefore, there is an effect that the safety of the worker can be ensured during the operation on the upper part of the car.

[Brief description of drawings]

FIG. 1 is a block diagram of an elevator including an embodiment of a safety device according to the present invention.

FIG. 2 is an electric circuit diagram showing a main configuration of the elevator shown in FIG.

FIG. 3 is a flowchart illustrating a processing procedure for controlling the operation of a car by the safety device in FIG.

[Explanation of symbols]

 1 car 2 counterweight 7 memory 8 torque command generating means 10 low speed traveling speed command device 11 detecting means 11a counterbalance weight position detecting circuit 12 restarting means 12a RS flip-flop circuit 13 low speed traveling stop relay 13a normally open contact 16 car top operation Means 22 Safety switch 23 Safety relay 23b Normally closed contact 24 Restart relay 24a Normally open contact

Claims (1)

[Claims] 1. An elevator having a car and a counterweight respectively moving up and down in a hoistway, and a car upper operating means installed on the upper part of the car and operating the car. The car upper operating means. In the elevator safety device including a detection means for detecting that the car moves up and down at a low speed and approaches the counterweight, a car stop means for stopping the car according to the detection of the detection means, and A safety device for an elevator, comprising: a restarting means for restarting the car stopped by the operation of the car stopping means.