JPS61124488A - Safety device for door of elevator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in an elevator door safety device, and more particularly to a failure detection technique for a door safety device provided for the safety of passengers getting on and off the elevator.

[Technical background and problems of the invention]

Conventionally, a mechanical safety is provided to prevent elevator passengers from getting caught in the elevator door while getting on or off the elevator, but this mechanical safety can only be detected when the elevator collides with a passenger. Therefore, in recent years, electric safeties such as phototube safeties that can detect passengers even if they do not collide have been installed.

This electric safety has more factors that can cause failures and malfunctions than mechanical safeties. For example, in the photoelectric safety mentioned above, malfunctions may occur due to axis misalignment between the emitter and receiver, or dust. If the door is prevented from opening due to a malfunction, the elevator will not be able to move, so as a countermeasure, we detect failures and malfunctions of the first electric safety, and disable the operation of the electric safety, thereby preventing the failure of the elevator system. Safety failure detection devices are increasingly being installed to prevent this.

FIG. 3 shows an example of a conventional elevator door control configuration diagram of a portion related to the present invention.

In the figure, 1 is an elevator control device, 2 is a door control device that directly controls the elevator door, 3 is an elevator door, and 4(a) is an output contact of a mechanical safety (not shown), which is turned on during operation. 5(a) The output contact of an electric safety (not shown) is turned on during operation. 6(a) is a door open detection contact based on the answer back from the door, and is turned on when the door is open.

FIG. 4 shows the elevator control device described in FIG. 3,
In the figure, 7 is a power supply for the microcomputer, 8 is an input circuit, into which signals from each safety contact 4ia), 5 (al) and door open detection contact 6(a) are input.9 is a microprocessor, and 110 is an output circuit. circuit, 11 memory one circuit,
The bus lines are data and address bus lines.

Figure 5 shows the operation flow for opening the electric safety door.

The operation of the above configuration will be described.

When the elevator arrives in response to a call, the control device shown in FIG. 3 inputs the position to the input circuit 8 shown in FIG. A door opening command is output to the control device 2. Then, when door 3 starts to open, door open contact 6 (
a) closes. When the door opens, passengers begin boarding and alighting, and the electric safety system detects the presence of a person and operates. 70 in Figure 5
-, the fixed door opening time (this value is based on the Ma
x (about 15 seconds), the electric safety is activated when someone gets on or off, and a door opening command is output, so the door continues to open. However, if the door continues to be opened for more than the previous value, the electrical safety failure or malfunction detection circuit is configured so that the door will close because the door opening command will not be output even if the electrical safety operates.

However, as shown in FIG. 5, the mechanical safety remains effective even when the electric safety becomes ineffective.

As mentioned above, conventional electric safety failure and malfunction detection circuits were invalidated based on the time elapsed since the door was opened, regardless of whether the electric safety operated normally or abnormally after the door was opened. . This is unavoidable when a malfunction occurs, but when it is normal, it is a problem for passengers. This causes inconveniences such as shocks caused by the mechanical safety hitting the body, and mental anguish caused by the doors closing and getting caught.

Also, if the electric safety is turned off due to a malfunction, it will pose a safety problem, but as an elevator system, there is no problem with a malfunction that makes the elevator system inoperable. However, if the on state continues, the elevator door will remain open and you will be unable to move from that floor forever. In this case, it is necessary to detect the failure and disable the electric safety even if it is on, so that the elevator system does not fail.

[Purpose of the invention]

The present invention was developed in view of the above points, and by determining whether the electric safety is roaring or not, and disconnecting it only when it is defective, it prevents the elevator door from opening and becoming stuck. To provide an elevator door safety device capable of providing safer service to passengers.

[Summary of the invention]

In the present invention, if the electric safety remains on for a certain period of time, for example, a maximum value of 15 seconds, which is impossible in normal operation, it is considered to be a failure, and if it is repeatedly turned on and off, it is considered to be normal, and it is considered to be a failure. If this occurs, the door will not open even if the electric safety is activated.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention when a microcomputer is used, and 12 in the figure is 5(a).
13 is a door open detection input storage area according to 4(a), 14 is an input storage area for mechanical safety, and 15 is a count that counts the time that the IE pneumatic safety is on. timer, 17
16 is a comparison circuit between the count timer 15 and the constant value 17; The mechanical safety ON output when the door is opened by the output of 13, the output judgment circuit for issuing a door opening command by turning on the electric safety when there is no door opening output of the comparison circuit 14 or 16, and the count circuit 15 mentioned above. Counting is started when the door open detection human power 13 is turned on, and cleared when it is turned off. FIG. 2 shows the processing flow.

In Fig. 1, when the door open detection input is inputted to the microcomputer by 4(a), the on state is stored in 13, and when the electric safety 5 operates, the on state is stored in 12 by the contact 5(a). be done. Then, 15 starts counting when the electric safety is turned on and the door is opened. This counter 15 has an electric safety off (12
13 is off) or the door is open (13 is off). The output of the electrical safety input storage 12 is connected to the door open output determination circuit 18, and when the output of the count circuit 15 is less than the set value of the constant value setting section [7], the output from the comparison circuit 16 is turned off. Therefore, when the door open detection 13 is determined, an ON output is output from the determination circuit 18, and since this is connected to the door control circuit 2, the door open command is detected again and the door reopens. But counter 1
When the value of 5 becomes greater than or equal to the set value of constant value setting part t7,
The ON output from the comparator circuit 16 makes the electrical safety output 120 ON thereafter invalid. However, the output 14 of the mechanical safety is determined by the comparison circuit 16 depending on the condition with the door open detection 13.
is valid regardless of the output of

As mentioned above, if the electric safety remains on for a certain period of time due to a failure or malfunction, the door opening command will no longer be issued due to the electric safety turning on, and the electric safety will no longer be turned on. , after a predetermined period of time, the elevator closes and the elevator can move to another floor.

Since the counter 15 does not count up while the electric safety continues to turn on and off, the door open signal 18 is output by the ON output of the electric safety input storage 12.

As described above, compared to the above-mentioned method that simply disables the electric safety regardless of failure or malfunction within a certain period of time after the door is opened, it is determined that the failure or malfunction is due to the ON state, which creates a situation where passengers getting on and off the vehicle are much more dangerous. This also prevents the elevator from becoming stuck due to failure or malfunction of the electric safety.

Although the present invention deals with the case where the on state continues, malfunctions that repeatedly turn on and off are also possible, and the present invention may malfunction.
A conventional door open time duration counting circuit can also be used as a backup for the malfunction detection circuit, and a method of setting the count circuit set time of the present invention to the conventional door open time counting circuit set time can also be configured in the package.

〔Effect of the invention〕

As explained above, according to the elevator door safety device of the present invention, it is possible to prevent the elevator door from opening and becoming stuck in the event of failure or malfunction of the electric safety, and to provide safer service to passengers. be able to.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is an operation flowchart of FIG. 1, FIGS. 3 to 5 are diagrams of a conventional example, and FIG. 3 is an elevator door control configuration. FIG. 4 shows an operation flowchart of the elevator control device, and FIG. 5 shows an operation flowchart of the electric safety. 4(a)...Mechanical safety contact 5(a)...Electric safety contact 6(a)...Door open detection contact 12...Electrical safety input storage section 13-...Door open detection input storage Part 14: Mechanical safety input storage unit 15, count timer 16, comparison circuit 17, constant value setting unit 18, output judgment circuit (7317) Agent: Patent attorney Nori: Yu Chika (
1 other person) Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] An elevator door safety device that uses both a mechanical safety and an electric safety includes an electric safety input storage section that inputs the operation output of the electric safety, a door open detection input storage section that inputs the door open detection output, and a count timer that inputs the output of the input storage section and counts the time that the electric safety is in the operating state; a constant value setting section that sets the number of hours for determining a failure when the electrical safety continues to be in the operating state; A comparison circuit that compares the output of the count timer and the output of the constant value setting section and outputs an output when the output time of the count timer is long, and an output that outputs a door opening command using the operation output of the electric safety when there is no output from the comparison circuit. An elevator door safety device characterized by comprising a determination circuit.