JPH0398984A - Safety device for elevator door - Google Patents

Abstract

PURPOSE:To detect an obstacle at a mechanical type safety dead zone, by forming at the upper and lower end portions of a safety shoe projecting portions projecting in an opening/closing direction, and providing at projecting portions a photoelectric device which transmits/receives a light signal in an up and down direction. CONSTITUTION:Limit switches 12 of a mechanical type safety are provided at safety shoes 11 at the opening/closing portions of cage doors 10, and at the same time, projecting portions 11a, 11b projecting in an opening/closing direction are formed at the upper and lower end portions of one safety shoe 11. And a light projector 19a and a light receiver 19b are provided at respective projecting portions, and light in an up and down direction is transmitted/received as a photoelectric tube device 19. When there is an obstacle between boors 11, 11, the obstacle is inspected by the contact of limit switches 12 during a closing action, but no inspection is made when the obstacle such as a small chain is at a dead zone. At this time, light in the up and down direction inspects this obstacle. Accordingly, there will be no dead zone, and an accident is prevented beforehand.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a safety device for an elevator door that stops or opens the elevator door when an obstacle is detected during the elevator door's closing direction.

(Prior Art) Mechanical safety, photoelectric tube safety, touchless safety, ultrasonic safety, etc. are generally known as safety devices for elevators.

Here, FIG. 9 shows an example in which a mechanical safety is used, and FIG. 10 shows an example in which a photoelectric tube type safety is used. In FIG. 9, 10 is a car door, 11 is a safety shoe, and 12 is a J misoto switch that is activated when the safety shoe 11 comes into contact with an obstacle. Also, the first
In figure 0, 10 is the car door, 11 is the safety shoe,
13 has a light emitter 13a on one side of the safety shell 11 and a light receiver 13b on the other side, 600 to 1200 m from the floor.
This is a photoelectric tube device installed at a height of n++e.

All of these safety devices for elevator doors perform controls such as stopping or opening the door when an obstacle is detected between the door being opened and the door being closed. FIG. 11 shows a configuration example of a door control device in such a safety device, and this door control device has a door control function in an elevator control device 14 consisting of a microcomputer (hereinafter referred to as CPU) installed in an elevator machine room. When an obstacle is detected by the above-mentioned limit switch 12 or photoelectric tube device 13 on the elevator door side 15, a control command such as a door stop command or an opening command is sent to the controller 17 of the electric motor 16 that drives the elevator door to open and close. Output.

In this case, the CPU 14 generally performs calculations on the door call registration circuit, safety circuit, etc. in series, and performs control by repeating these steps. In addition, a controller 17 of the electric motor 16
The controller controls the speed, rotation direction, and stop of the electric motor 16 by switching the current direction of the electric motor 16 and controlling the rotational speed according to commands from the CPU 14.

Note that 18 is a cable connecting the CPU 14 of the elevator service room and the elevator door side 15.

Next, the control operation of the elevator door safety device will be explained based on the functional blocks shown in FIG.

If the limit switch 12 or photoelectric tube device 13 is activated by some obstacle while the screen 10 is moving in the closing direction, a detection signal is output in step A, and this detection signal is sent to the interface of the machine room control panel. The acquisition takes place in a first step B of the CPU 14 via the circuit. Next, in the second step C, a door close stop command is issued, and the elevator door side 15 is sent via the interface circuit.
It is transferred to the controller 17 of. Therefore, in step D, the controller 17 issues a current cutoff command to the motor 16,
The current of the electric motor 16 is cut off.

Next, when a door opening command is issued by the CPU 14 in the third step E, this door opening command is transmitted to the controller 17 on the elevator door side 15 via the interface circuit. Therefore, in step F, the motor current is switched so that the motor 16 operates in the door opening direction, and the door 10 is reopened.

Then, after a certain period of time has elapsed after the door has been opened, the door 10 is closed again, and the above operation is repeated.

By the way, in the case of a photoelectric safety device for elevator doors, it is decided that the emitter 13a and the receiver 13b should be installed at a height of 600 to 1200 mm above the floor, so there are certain limitations. It can only detect obstacles within a certain range.

On the other hand, although not mentioned above, in the case of non-contact type safety devices such as touchless door safety and ultrasonic door safety, the detection range is determined by the position of the door in consideration of their respective characteristics as shown in Figure 13. Because of this, it can only detect obstacles within a limited range, similar to the case with photoelectric safety.

Therefore, at present, we have no choice but to rely on mechanical safety as a safety device for elevator doors, but when the door is completely closed, the safety shoe 11 attached to the opening/closing tip of the door is Since the limit switches 12 are pressed together, a dead zone is provided in which the circuit is disconnected 50 to {00 meters before the door is completely closed, as shown in FIG. 13.

(Problem to be solved by the invention) However, in this mechanical safety, if a dead zone is provided 50 to 100 mm before the door is completely closed,
If there is an obstacle in this dead zone, it cannot be detected.

For example, even if a chain to which a handbag, dog, etc. is tied is caught between the safety straps at the opening/closing end of the door, it cannot be detected, so if the elevator is operated in that state, there is a risk of an accident.

In addition, mechanical safety devices have a detection sensitivity that operates when they make strong contact with an obstacle, so when an arm or the like is caught between the safety shoes, a very strong force is applied, which is very dangerous.

The present invention provides safety for elevator doors that can reliably detect obstacles in the dead zone of the mechanical safety and prevent accidents of being caught between the safety shoes at the opening/closing tip of the door. The purpose is to provide equipment.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention incorporates a non-contact type safety shoe into a safety shoe provided at the opening/closing tip of an elevator door that is driven to open/close by an electric motor. , a safety device for an elevator door in which at least one of the mechanical safeties is attached to detect the presence or absence of an obstacle when the door is operated in the door closing direction; A photoelectric device is provided, in which one of the convex portions is provided with a light emitting portion that emits an optical signal in the vertical direction, and the other of the convex portions is provided with a light receiving portion that receives this optical signal. When this is detected, the electric motor is controlled so that the operation of the elevator door in the closing direction is stopped or opened again.

(Function) Therefore, in the elevator door safety device having such a configuration, light (!) is transmitted and received in the vertical direction to the gate formed at the bottom end of the safety shoe and protruding in the door closing direction.
Since a photoelectric device is provided to detect obstacles from above and below, it is possible to detect obstacles in a dead zone that cannot be detected by a non-contact safety or a mechanical safety.

(Length example) An embodiment of the present invention will be described below with reference to the drawings.

Figure 1(a). (b) shows a configuration example of the elevator door safety device according to the present invention, FIG. 1(a) is a view seen from the back side of the door, and FIG. 1(b) is a detailed view of section A in FIG. be. In this embodiment, as shown in FIGS. 1(a) and 1(b), a mechanical safety, in this case a limit switch 12, is used which is activated when an obstacle comes into contact with the safety shoe 11 provided at the opening/closing tip of the double car door 10. In the elevator door safety device provided, the safety shoe 11 on one car door 10 side
Convex portions 11a and 1lb are formed at the bottom end of the soil to project in the door closing direction, and a projector 19a that emits light (. A light receiver 19b for receiving a signal is provided respectively.In this case, the light projector 19a and the light receiver 19b constitute one phototube device.

In addition, Fig. 2 shows the circuit configuration of a control device that controls opening and closing of the elevator door in the elevator door safety device having such a structure, and the same parts as in Fig. 11 are given the same symbols and their explanations are given. This will be omitted and the different parts will be described here. That is, in Fig. 2, the CP installed in the machine room
In addition to inputting the detection signal of the limit switch 12 to U14, a detection signal obtained by light reception by the light receiver 19b of one phototube device is manually inputted via the interface circuit of the control panel.

Next, the operation of the elevator door safety device constructed as described above will be explained.

First, the operation of a typical elevator is carried out as shown in the flowchart shown in FIG. 3 by a control device installed in a machine room. That is, in step 31, it is determined whether or not there is an elevator call, and if there is a call, the elevator is operated toward the destination floor in step 32, and when it is confirmed that the destination floor has been reached in step 33, the door 10 is opened in step 34. is opened to allow passengers to board. Next, in step 35, if it is determined that a certain period of time has elapsed or that the door close button in the car has been pressed, the door closing operation is started in step 36, and at that time, in step 37, the door is closed (details will be described later). It is determined whether there is an obstacle in the closing direction. If there is no obstacle, the door closing operation is completed in step 38, and if there is an obstacle, the process returns to step 34, and J7i! 10 in the opening direction.

Next, to describe the operation when there is an obstacle during the door closing operation using the flow shown in Figure 4, the door IO moves in the door closing direction from the A-A- position shown in Figures 5 and 6. shall be taken as a thing. First, in step 41, it is determined whether or not the door 10 is in the closing operation, and if it is in the closing operation, in step 42, the obstacle detection function is performed using a mechanical safety (limit switch 12 that operates when the safety shoe is pushed). becomes effective from the door open position A-A-. And step 43
It is determined whether or not there is an obstacle while the door 10 is closed to the B-B=C-C'' position. If there is an obstacle, the door is reopened in step 44 based on a detection signal generated by the operation of the limit switch 12. Further, if it is determined in step 43 that there is no obstacle, the process proceeds to step 45, and the door is
- It is determined whether the D-1 position has been reached. Then, when it is determined in step 45 that the door has reached the DD- position, the mechanical safety is disabled in step 46. The state of the door 10 at this time is shown in FIG.

In this case, the phototube device 19 consisting of a light emitter 19a and a light receiver 19b provided on the convex portions at both the upper and lower ends of the safety shoe 11 detects obstacles from above and below, and is therefore in an effective state at step 47.

Therefore, even though the mechanical safety is disabled when the door reaches the D--D- position, a single phototube device determines whether an obstruction is present at step 48. If it is determined in step 48 that there is an obstacle, the process returns to step 44 and the door rear is opened, and if it is determined that there is no obstruction, the door is closed in step 49.

The above operation is shown in FIG. 8 using a diaphragm. In other words, the mechanical door safety is effective while the door 10 is from the A-A'' position to the D-D- position;
From the D-position until the door is completely closed (50 to 100
mm) is set as a dead zone. On the other hand, since one phototube device detects obstacles from above and below using a light emitter 19a and a light receiver 19b, it is possible to effectively detect obstacles even in the dead zone of a mechanical door safety.

In this way, in this embodiment, obstacles are detected from above and below using the phototube device 19 consisting of the light emitter 19a and the light receiver 19b provided on the convex portions at both the upper and lower ends of the safety shoe 11, so that the door 10 is Obstacles can be detected even when the mechanical door safety is moving in the closing direction from the DD position, which is the dead zone. Therefore, for example, diameter 5
Even in the case where a dog tied to a chain of about 1.5 mm is on the hall side and a passenger is in the basket pile, the chain is detected and the door reopens, thereby preventing accidents caused by being caught in the dog.

In addition, in the above embodiment, the mechanical safety and the phototube device 1 are
9, but in place of the mechanical safety, there is a touchless safety, an ultrasonic safety, or a phototube safety that transmits and receives optical signals in the horizontal direction at a height of 600-120011111 from the floor. It may also be used in combination.

Here, in the case of touchless safety and ultrasonic safety, the door 10 is moved from A-A- to B as shown in FIG.
-B- position and from the D-D- position until the door 10 is completely closed, it is disconnected from the circuit and becomes ineffective, and in the case of a phototube safety, the door 10 is 1
When 0 reaches the C-C- position, it is disconnected from the circuit and becomes ineffective, but if one phototube device is used to detect obstacles from above and below, n° becomes ineffective even in these ineffective zones. It can be made to work.

[Effects of the Invention] As described above, according to the present invention, it is possible to detect obstacles in the entire range until the elevator door is completely closed, thereby preventing accidents caused by objects such as chains or handbags being caught. It is possible to provide a highly safe elevator door safety device because it can prevent I-hikes and can detect objects without coming into contact with them, unlike mechanical door safety systems that have poor operational sensitivity.

[Brief explanation of drawings]

1(a) and 1(b) show an embodiment of the elevator door safety device according to the present invention, in which (a) is a view seen from the rear side of the door; (b) is a diagram showing details of part A of (a), the second
The figure is a block diagram of the control device in the same embodiment, Figures 3 and 4 are flowcharts for explaining the operation of the same embodiment, and Figures 5 to 7 show how to close the door until an obstacle is detected. The position of each door during directional operation is shown; Figure 5 is a top view, Figure 6 is a top view, and Figure 6 is a top view.
The figure is the front view, Figure 7 is the state diagram before the door is completely closed,
The eighth garden is a diaphragm that shows the detection range of various safety devices,
Figures 9 and 10 are diagrams showing configuration examples of conventional elevator door safety devices as seen from the rear side of the door, Figure 11 is a block diagram of a control device in the conventional safety device, and Figure 12 is a control device for elevator doors. FIG. 13 is a block diagram for explaining the door control function according to the present invention, and FIG. 13 is a diaphragm showing the detection range by various conventional safety devices. 10...Car door, 11...Safety shoe, 11a, llb...Protrusion, 12...
...Limit switch, 14...Door control device,
One...Phototube device, 1. 9 a...
- Emitter, 19b...Receiver.

Claims (1)

[Claims] A non-contact safety shoe is installed on the opening/closing tip of the elevator door, which is driven to open/close by an electric motor.
In an elevator door safety device in which at least one of the mechanical safeties is attached to detect the presence or absence of an obstacle during door closing direction operation, a convex portion protruding in the door closing direction is formed at the upper and lower ends of the safety shoe, and this A photoelectric device is provided in which one of the convex portions is provided with a light emitting portion that emits an optical signal in the vertical direction, and the other of the convex portions is provided with a light receiving portion that receives the optical signal, and an obstacle is detected by this photoelectric device. A safety device for an elevator door, characterized in that the electric motor is controlled so that the closing direction movement of the elevator door is stopped or the elevator door is reopened.