JPS6052070B2 - Elevator rail derailment detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a rail derailment detection device for detecting so-called "rail derailment" in which an elevator car or counterweight derails from a guide rail during an earthquake or the like.

The rail derailment detection device is a detection device that detects when an elevator is subjected to seismic force during an earthquake and the roller guide or guide shoe that guides the car or counterweight has derailed from the guide rail, allowing the elevator passengers to be rescued safely. .

Conventionally, there is a system as shown in Fig. 1 as a rail deviation detection device.

In FIG. 1, a conducting wire 8 is stretched between the top and bottom of the hoistway 2, and a sensing body 9 is attached from the car 4 and the counterweight 5 so as to surround the conducting wire 8. Figure 2 shows details of the mounting relationship. A voltage is applied to the sensing body 9 installed on the car 4 and the counterweight 5 through conductors such as conductive wires and hanging ropes 3. Therefore, when the car 4 or the counterweight 5 comes off the rail and the sensing body 9 and the conductor 8 come into contact, the conductor and the sensing body are installed in the car or the counterweight, and then through the cable 12 or the hanging rope, etc. An electrical loop circuit is constructed, and relays and the like operate. For example, the signals generated by this relay, etc., such as opening and closing of contacts, are used as signals for emergency control in the event of an earthquake, such as stopping the elevator or operating the elevator at low speed to the nearest floor. However, the conventional methods described above have the following drawbacks. Generally, the height of the hoistway of elevators installed in buildings, towers, etc. reaches 100 to 2,507 TL.
Even in such a high case, the conductor runs from the top to the bottom.
It is necessary to stretch it without providing intermediate support. Conductive wires that are stretched from top to bottom over such a long span can resonate and sway considerably due to slight shaking of the building due to wind pressure, or wind pressure when the elevator is running. Due to this shaking of the conductor, even if the elevator car or counterweight does not come off the rails, the conductor comes into contact with the sensing body, forming a loop circuit, which may cause the above-mentioned relay to operate unnecessarily. On the other hand, even during an earthquake, the baskets and counterweights vibrate laterally in response to the lateral shaking of the building. At this time, if large vibrations occur due to an earthquake, rail derailment will occur, but
Rail derailment does not occur within the vibration amplitude required for rail derailment. However, even when the rail does not come off, as mentioned above, the cage,
Also, due to the horizontal oscillation of the counterweight, the conducting wire and the sensing body may come into contact, resulting in malfunction. Furthermore, in the event of an earthquake, the conductor itself will sway considerably as the building responds to the earthquake.

This, combined with the lateral vibration of the sensor due to the shaking of the car and counterweight, makes malfunctions more likely to occur at any time. Once a malfunction occurs in this manner, the elevator car may stop or land at the nearest floor, causing the elevator to cease normal service, which has a very large impact.

On the other hand, if a car or a counterweight actually derails from the guide rail, it is required to reliably configure a loop circuit to perform emergency operation control. The present invention has been made in consideration of the above-mentioned problems, and when the conductor and the sensing body come into contact, it can be caused by an instantaneous contact caused by the vibration of one car or a weight or the vibration of the conductor. To provide an improved elevator derailing detection device that correctly detects derailing by determining whether the counterweight is in continuous contact due to actually derailing.

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 3A and 3B show the current flowing through the loop circuit when the sensing body contacts the conducting wire in the case of instantaneous contact and the case of continuous contact, respectively. In other words, Fig. 3a shows that even though the rail does not come off as described above, the conductor sways or the cage or the weight is displaced due to the deflection of the guide rail, causing the conductor to momentarily break off. This shows how the sensor contacts the sensor and current flows.

On the other hand, FIG. 3b shows a case where the conducting wire and the sensing body are in contact for a certain period of time or more, and this contact can be considered to mean that the basket or counterweight has actually come off the rail. Detecting the condition shown in FIG. 3b above is easily possible by using a time-limited relay.

FIG. 4 shows the simplest time-limited relay circuit. In Fig. 4, LS is a contact that opens and closes when the conductor and the sensing body come into contact with each other and come apart, and R1
is a resistor connected in series to relay X, and C is a capacitor connected in parallel.

Now, if the voltage applied to the circuit is ■1, will C be a contact after the discharge is completed? The voltage V2 across the coil of relay X when closed is expressed using operator S as shown in the following equation. R2 here
is the resistance value of the relay coil. Electric FEV2 according to the above formula
The rise of is shown in FIG. For example, if R1 and C are selected so that the attraction operation voltage (3) of the relay becomes V3+0.63V2, the time until the relay operates almost coincides with the time constant T=4.2 in the above equation. In other words, the relay is activated only when the conducting wires R1+R2 are in contact with the sensing body for a time T or longer, and this relay operation delay time T is determined by the instantaneous contact time shown in Figure 3a to distinguish between instantaneous contact and continuous contact, and the relay is activated. Rails can be detected correctly.

FIG. 7 shows another improved embodiment of the time-limiting relay circuit used in the present invention.

That is, the circuit configuration shown in FIG. 4 includes the following problems. For example, a contact point? When the capacitor C opens and closes with a lapse of time as shown in Figure 6a, even if the contact opens, the amount of electricity accumulated in the capacitor C is discharged by the circuit made up of the parallel capacitor C and the resistance R2 of the relay. It takes a certain amount of time for the voltage across the relay ■2 to drop to zero. In other words, will it contact again before the discharge is completed and V2 = 0? When the capacitor is closed, the charge in the capacitor is accumulated in sequence, and the relay is operated in an instantaneous closing time T1 shorter than the set time T, as shown in FIG. 6b. FIG. 7 shows a circuit devised to solve the above problem, which operates in accordance with the opening and closing operations of the contact LS.

A relay Xp is added and connected in parallel with the normally closed contact capacitor C of the relay Xp. In this way, when contact LS closes, contact Xp opens and performs the same operation as shown in Figure 4, and when contact LS opens, contact Xp closes,
The charge accumulated in the capacitor C is quickly discharged.
Therefore, if the circuit configuration shown in FIG. 7 is used, even if the contact LS is opened and closed as shown in FIG. When closed, the terminal voltage V3 of the relay X is always zero, and the operating time T of the relay X can be kept constant. Although the case where a simple time-limiting relay circuit is used has been described above, it is possible to use a thyristor or the like as the transistor in the time-limiting relay circuit according to the present invention, thereby making it possible to set the time more easily and over a wide range.

As explained above, according to the present invention, in an elevator that ascends and descends while a car or a counterweight is guided by a guide rail, a conductive wire stretched parallel to the guide rail in the hoistway and attached to the car or counterweight, When detecting contact with a sensor moving close to the conductive wire to detect the elevator car or counterweight coming off the rails, inserting a delay circuit into the detection output circuit can prevent the contact from occurring instantaneously. In this way, it is possible to obtain an elevator derailment detection device that correctly detects the occurrence of derailment and is free from malfunctions.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the general configuration of an elevator equipped with a rail derailment detection device, Fig. 2 is a diagram showing the attachment relationship between the conducting wire 8 and the sensing body 9 in Fig. 1, and Fig. 3 A and b are each showing the conducting wires. Fig. 4 shows the configuration of a simple time-limited relay used in the present invention. The circuit diagram, FIG. 5 is a diagram showing the rise of the relay coil voltage in FIG. 4, FIGS. 6A and b are diagrams showing the relationship between the detected current and relay coil voltage in the circuit of FIG. The figure is a diagram showing another embodiment of the time-limiting relay circuit used in the present invention. 1...Hoisting machine, 2...Hoistway, 4...
... Elevator car, 5 ... Counterweight, 6 ... Guide rail, 7 ... Guide roller, 8 ... Conductor, 9 ...・Sensor, L
S: Equivalent contact point that indicates contact between the conductor and the sensing body.

Claims (1)

[Claims] 1. In an elevator that raises and lowers a car or a counterweight guided by guide rails, there is a conductor that runs parallel to the guide rail in the hoistway, and a conductor that is attached to the elevator car or counterweight that approaches the said conductor as the elevator goes up and down. 1. A derailing detection device for an elevator, comprising: a sensing body that moves in parallel with the conductive wire; and a delay circuit that generates an output when the conductive wire and the sensing body are in contact with each other for a certain period of time or more.