JPS60161883A - 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 a device for detecting a break in an elevator tail cord that may occur during an earthquake.

[Technical background of the invention and its problems]

Figure 1 shows an overview of the elevator. A car 1 carrying people, luggage, etc. and a train 2 are connected by a lobe 3 and driven by a hoist 4 to raise and lower the passenger car 1. A tail cord 5 is provided for transmitting electrical signals between a control device (not shown) that controls the hoisting machine 4 and the car 1, and for power source for lighting inside the car. The tail cord 5 is usually fixed at one end approximately in the middle of the hoistway, and the other end is fixed at the lower end of the seat 1 and suspended within the hoistway.

In skyscrapers ζ2, the number of which has increased significantly in recent years, the length of the tail cord 5 is naturally long, and some are over 200 meters long. At the entrance of such a building, the tail cord 5 may sway significantly during an earthquake, so there is a risk that it may get caught in other equipment in the hoistway.

If the elevator car 1 is raised or lowered while it is stuck, the tail cord 5 may break and the equipment may be damaged, causing sudden stoppage of the elevator car and other dangers to the passengers inside the elevator car. will require a great deal of time and expense.

FIG. 2 shows the connecting portion between the seat 1 and the tail cord 5, which have been conventionally used. An arm 6 is firmly attached to the seat 1, and a tail cord is firmly attached to the arm 6 by a retainer 7. Therefore, if the tail cord 5 gets caught on equipment in the hoistway, a large force is immediately applied to the tail cord 5, causing an accident such as wire breakage. Furthermore, since there is no device for detecting a catch even after the hoist is pulled, the hoist 4 continues to try to rotate, resulting in serious damage such as breakage of the entire tail cord 5 and damage to the arm 6.

Another conventional diagram is shown in Figure 3, in which the arm 6 is firmly attached to the seat 1. A retainer 7 is attached to the end of the tail cord 5, and a spring seat 8 and a spring 9, which also serve as a striker, are interposed between the retainer 7 and the arm 6. A limit switch 10 that is activated by the lowering of the spring seat 8 is attached to the arm 6. This prevents a sudden increase in tension when the tail cord 5 is pulled, and also detects the slack of the spring 9, which is an elastic body, using a micro switch or the like, and stops the drive of the hoist 4. It is used to control the

In this case, if a large tension is generated in the tail cord 5, serious accidents such as breakage of the tail cord 9 can be prevented by the deflection of the spring 9, but there are the following problems.

When the passenger seat 1 is on the top floor, the weight of the tail cord 5 is directly applied to the spring 9. At this time, it is necessary to set the limit switch 10 so that it does not operate. Considering the case where the tail cord 5 gets caught on other equipment on the lowest floor when the passenger is near the lowest floor, the limit switch 10 should not operate until the tail cord receives a tension equal to approximately the weight of the tail cord. (Second. Naturally, this level of tension will not cause the tail cord 5 to break, but a large load will be applied to the equipment hooked to the tail cord 5. For example, a tail cord of 9 to 91 per meter will be applied. If the hoistway distance is 200 m, the limit switch will not operate until a tension of approximately 9 in 100 is generated. Some of the hoistway equipment is minor equipment such as inspection equipment. Therefore, even with this level of load, &Nfi will occur.

Now, in a skyscraper, the elevator usually has 150
The vehicle is traveling at high speeds of m/min or higher. Therefore, even if the tail cord 5 is caught while traveling at such a high speed, it is difficult for the spring 9 to absorb the tension of the tail cord. Normally, such skyscrapers are equipped with earthquake detectors (
(not shown) is attached to the top of a building or an elevator/machine room to perform controls such as stopping the elevator at the nearest floor as soon as possible in the event of an earthquake. Therefore, in such a case, due to advance control, it is very unlikely that the vehicle will get caught during high-speed driving.

However, in the event of a major earthquake, the extent of the damage inside the hoistway is not known at all, and it takes a great deal of effort to restore the area, especially due to problems with the power of recovery personnel as the elevators in the area and belt are stopped all at once. It takes time. For this reason, it may be possible to temporarily stop the elevator after the earthquake sensor is activated and then automatically restart the elevator after the seismic motion has subsided. This is important for detection during automatic recovery, and it is thought that if reliable detection is not performed, the tail cord will be damaged at the time of detection, further delaying recovery.

Therefore, the presence or absence of a tail cord catch is one of the criteria for determining whether automatic recovery is possible, but conventional detection methods have problems with detection sensitivity, and there is a risk of damage even if an attempt is made to detect it.

[Purpose of the invention]

As described above, the present invention aims to prevent damage, detect an abnormality with as little tension as possible, and perform controls such as stopping the elevator.

[Summary of the invention]

Usually, a plurality of elevator tail cords 5 are used. Normally, equipment in the hoistway is unlikely to have two or three tail cords caught at once. The present invention focuses on this point and attempts to detect the shadow. That is, a rotatable lever is provided at the rider's heel, and the tail cord is attached to the lever so that its weight is approximately balanced with respect to the fulcrum of the lever. If abnormal tension is generated in the tail cord on one side of the fulcrum, the lever will rotate. Detection is made by the operation of this rotational limit switch.

In addition, if the tail cord gets caught in the hoistway after an earthquake, the abnormality will be detected with high sensitivity, and the signal will be used to determine whether or not the system can operate, preventing further damage and automatically restoring the system if normal. .

[Embodiments of the invention]

An embodiment of the present invention will be described below based on the same song. In FIG. 4, a case where there are two tail cords will be described for simplicity. A lever 12 is rotatably attached to a seat 1 using a pin 11 as a fulcrum. The two tail cords 5 are fixed to the retainers 7 at positions approximately equidistant from the fulcrums. Gently hold down the rotation of the lever 12 so that the lever 13 can be balanced. The spring 13 has a structure (not shown) that acts to restrain the lever 12 from rotating in either direction when it rotates reversibly, and stably supports the normal movement of the lever 12.

Further, a limit switch 10 is attached to the fixed side of the seat 1 at one end of the lever 12 at a position facing upward and downward. Since the weight of the tail cord 5 is applied against the pier 11 il, it is not applied against the splash 13. The spring 13 can have a spring constant that suppresses the rotation of the lever 12 due to vibrations caused by normal running. As a result, the limit switch 10 does not operate until a weight approximately equal to the weight of the tail cord is applied, unlike the conventional case, since the limit switch 10 does not sag due to the position 1 when riding on the spring 13. Therefore, the tension of a very small tail cord can be adjusted to operate the limit switch 10.

In other words, regardless of whether the passenger door 1 is at the top or the bottom of the hoistway, the weight of the tail cord 5 is always directly affected by the main weight at the fixed part of the passenger door 1, so it is not affected by any changes in the weight of the tail cord 5. do not have.

By the way, when the tail cord 5 is caught, the balance of the lever 12 is lost and the limit switch 10 is operated, so the sensitivity is extremely good.

For example, a building may be equipped with an earthquake sensor that detects when seismic acceleration exceeding a predetermined level has been received, and a control device that will stop the elevator at the nearest floor and then automatically or manually restore the elevator. For those equipped with a control device that operates at a lower speed than the rated speed before restoration, the abnormality detection device in the tail cord is operated to prioritize and stop the restoration operation, and if there is no abnormality, it is a guideline for restoration. Therefore, switch to normal operation after a trial run.

The above test runs the elevator unmanned at a speed slower than the rated speed. When driving at such slow speeds,
Something like the one shown in Figure 4 will stop the elevator before a sufficiently large force is generated on the tail cord. If the tail cord 5 is detected to be stuck during this trial run, the elevator is immediately stopped and automatic recovery is abandoned, thereby preventing damage to the tail cord 5 and requiring recovery personnel to recover afterward. Significant time and cost savings can be achieved. Furthermore, by attaching the tail cord 5 to a rotatable lever, it becomes possible to detect small tension abnormalities, which prevents damage to equipment in the hoistway, reducing the cost and time required for recovery after an earthquake. can be significantly reduced.

[Other embodiments of the invention]

As shown in Figure 5, if there are three or four tail cords, or if you install them so that the moment of rotation of the fulcrum is equal even if the tail cords are divided into two and hung, the same procedure can be carried out. Effects can be obtained.

Further, as shown in FIG. 6, a lever 12 (: groove 16) is provided at the base of the spring 13 so as to be activated by a certain moment abnormality, and a wedge 14 or the like is pressed against this by a spring 15. In this case, the lever 12 is prevented from rotating under normal conditions, resulting in a highly reliable system.

Incidentally, when there is only one tail cord, the same effect can be easily obtained by providing the lever 12 with an elastic body or a balance weight for maintaining balance.

Further, although the tail cord is suspended in equilibrium on the car side, it can also be provided on the hoistway wall side.

[Overall effect of the invention]

As explained above, by attaching the tail cord to the rider's heel via a movable lever and installing a detector that detects rotation, it will immediately send a signal when abnormal tension occurs due to the tail cord being caught. Since the elevator is not operated based on the judgment made by the control device, damage to the tail cord can be prevented.

On the other hand, the above detection can also be used to determine the restoration of elevators after an earthquake.If there is an abnormality, it can be stopped immediately, and if it is normal, it can be restored immediately.As a result, the detection sensitivity is improved.
This has a remarkable effect on improving operational services.

[Brief explanation of drawings]

Figure 1 is a schematic side view of the elevator, Figure 82 is a partially enlarged side view of a conventional elevator with a tail cord attached, Figure 3 is a view equivalent to Figure 2 showing another conventional example, and Figure 4. Figure 5 is a partially enlarged side view showing the tail cord attached to the rider of the present invention.
Figures (a) and (b) are explanatory diagrams of how to hang the tail cord of the present invention, and Figure 6 is a diagram corresponding to Figure 4 of another embodiment of the present invention. 1. Rider, 5. Tail cord, 10... Limit switch (detection device), 12
...Lever, 13...Spring (elastic member), (7317) Agent Patent attorney Noriyuki Chika (and 1 other person) Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5

Claims (1)

[Scope of Claims] (1) In an elevator equipped with a tail cord hanging down in a hoistway with one end attached to a lifting wall and the other end attached to a passenger seat, the tail cord can be attached, and the tail cord can be freely rotated and balanced. Elevator-0 characterized by comprising a lever provided to hold the lever, and a detection device for detecting the movement of the lever. (3) The abnormality detection device for the tail cord is activated when the elevator resumes operation after being subjected to earthquake acceleration. When,
Elevator-0 according to claim 1, characterized in that the operation is stopped by the signal.