JP4839862B2 - Elevator abnormality detection device and elevator repair method - Google Patents

Description

  The present invention relates to a 2: 1 roping type elevator apparatus in which a main rope is folded upward by a return wheel provided under an elevator car, an abnormality detection apparatus for detecting an abnormality of the main rope, and an existing elevator to the above-mentioned The present invention relates to an elevator renovation method for newly installing an abnormality detection device.

  The main rope that suspends the elevator and the counterweight in the elevator hoistway is raised and lowered in the event of a large shake caused by an earthquake or when the car is greatly shaken by a passenger's mischief, etc. It may get caught by protrusions such as equipment provided in the road. If the car continues to move up and down in such a state, an excessive load acts on the main rope, and there is a possibility that various types of elevator equipment may be damaged, or the main rope may come off from the wrapped return wheel. For this reason, as conventional techniques for preventing the above-described problems, a load weight detecting means for detecting the load weight of the car provided under the car floor, and a car provided between the end of the main rope and the car for suspending the car. A total weight detecting means for detecting the total weight of the car, and based on the detection result by the loaded weight detecting means and the detection result by the total weight detecting means, the abnormality of the load acting on the main rope is determined, and the car is An emergency stop has been proposed (see, for example, Patent Document 1).

JP-A-11-79589

  When judging from the load acting on the main rope that the main rope has been caught by the protrusion in the hoistway due to the shaking of the earthquake, etc., as described in Patent Document 1, the judgment criterion is based on the load weight of the car It will be different. For this reason, in the thing of patent document 1, after considering the detection result by a loading weight detection means, the abnormality of the load which acts on a main rope must be judged based on the detection result by a total weight detection means, and elevator control It was necessary to provide a program for judging the abnormality in the panel. Therefore, for example, in the case where the one described in Patent Document 1 is made to correspond to an existing elevator, it is necessary to change the program in the control panel, which causes high cost and deterioration of workability. It was.

  Moreover, when applying the thing of the said patent document 1 to the elevator apparatus of the 2: 1 roping method by which the main rope was turned up by the return wheel provided under the elevator car, the main rope end part was connected. A total weight detector for detecting the total weight of the car had to be installed at the top of the hoistway and the like. For this reason, for example, in a machine room-less elevator apparatus in which no machine room is provided at the top of the hoistway, there may be a case where a sufficient installation space cannot be secured at the top of the hoistway.

  The present invention has been made to solve the above-described problems, and its object is to provide a 2: 1 roping type elevator apparatus in which a main rope is folded upward by a return wheel provided under the elevator car. In the elevator, the abnormality of the main rope that suspends the car can be reliably detected, and the abnormality detection device of the elevator that can easily cope with the existing elevator device, and the above abnormality detection device are newly installed in the existing elevator It is to provide an elevator renovation method.

  The elevator abnormality detection device according to the present invention is wound around a car turn-down car and a car turn-down car that are rotatably provided at the lower part of one side of the car, as to ascend and descend in the elevator hoistway. The movable side, which is suspended from the car lowering wheel, is suspended along the side surface of the car, and the lower end of the movable side of the suspension side. A first detection device that detects a displacement amount displaced in a direction away from one side of the car and an upper part on one side of the car, and passes near the upper part of the car on the movable side of the suspension means. A part thereof includes a second detection device that detects a displacement amount displaced in a direction along one side surface of the car on the vertical projection plane.

  The elevator abnormality detection device according to the present invention includes a car that moves up and down in an elevator hoistway, a car turn-down vehicle that is rotatably provided at a lower part on one side of the car and a lower part on the other side, and each car. Suspension means that is wound around a turnover car and suspends a car, and the movable side folded back from each car turnover car is arranged along one side and the other side of the car, and one of the car A first detection device that is provided at each of a lower portion on the side surface side and a lower portion on the other side surface and that detects a displacement amount of each movable side lower end portion of the suspension means displaced in a direction away from one side surface or the other side surface of the car; A part of each movable side of the suspension means that passes through the vicinity of the upper part of the car in the direction along the one side or the other side of the car on the vertical projection plane is provided at the upper part of the one side and the upper part of the other side. Detect the amount of displacement It is obtained by a second detector.

  Further, the elevator repair method according to the present invention includes a car turn-down vehicle that is rotatably provided at the lower part of one side of the car, and a car turn-down car that is wound up and down in the elevator hoistway. Suspends the car, and the movable side folded back upward from the car turnover car has a suspension means arranged along one side of the car. , A first detection device for detecting a displacement amount in which the movable side lower end of the suspension means is displaced in a direction away from one side surface of the car, and on the upper side surface side of the car, on the movable side of the suspension means, A second detection device that detects the amount of displacement of a part of the cage passing in the vicinity of the upper portion of the car in a direction along one side of the car on the vertical projection plane is newly installed, and the suspension detected by the first detection device. The displacement amount of the means in a predetermined direction and the second A safety circuit relay is installed to stop the car by operating the emergency stop device of the car when any one of the displacements of the suspension means detected by the detection device exceeds a predetermined value. .

  The present invention relates to a car turning up and down in an elevator hoistway, a car turn-down car provided rotatably at a lower part of one side of the car, a car being wound around the car turn-down car, The movable side folded upward from the turnover wheel is provided on the suspension means arranged along one side of the car and the lower part of one side of the car, and the lower end of the movable side of the suspension means is one side of the car. A first detection device for detecting a displacement amount displaced in a direction away from the vehicle, and a part of the movable side of the car that passes through the vicinity of the upper part of the car, and a part of the moving part of the suspension means is vertically projected. The main rope is folded upward by the return wheel provided under the elevator car by the second detection device that detects the amount of displacement displaced in the direction along one side of the upper car. 2: 1 roping type elevator Also in the apparatus, it is possible to reliably detect the abnormality of the main rope for suspending the car.

  In order to explain the present invention in more detail, it will be described with reference to the accompanying drawings. In addition, in each figure, the same code | symbol is attached | subjected to the part which is the same or it corresponds, The duplication description is simplified or abbreviate | omitted suitably.

Embodiment 1 FIG.
FIG. 1 is a schematic diagram showing the configuration of an elevator apparatus according to Embodiment 1 of the present invention, FIG. 2 is a detail view of a main part of the elevator abnormality detection apparatus according to Embodiment 1 of the present invention, and FIG. 3 is shown in FIG. FIG. 3 is an AA arrow view of the elevator abnormality detection device, and FIG. 3 shows the entire elevator device. In FIG. 1 to FIG. 3, 1 is an elevator hoistway, 2 is a car that moves up and down in the hoistway 1, 3 is arranged on the back side of the car 2 on the vertical projection plane, and in the hoistway 1 in conjunction with the car 2 It is a counterweight that moves up and down, and the car 2 and the counterweight 3 are lifted and lowered in the hoistway 1 in opposite directions by being suspended in a fishing bottle manner by the main rope 4. The main rope 4 can be replaced by other suspension means such as a belt.

  Reference numeral 5 denotes a pair of car guide rails for restricting the movement of the car 2 in the horizontal direction and guiding the raising and lowering direction. The car 2 has one side 2a and the other side 2b opposite to the one side 2a. They are arranged so as to face each other. Reference numeral 6 denotes a car door that opens and closes a car doorway (not shown) formed on the front side surface of the car 2 orthogonal to the side surfaces 2a and 2b so as to avoid interference with the car guide rail 5. .

  Reference numeral 7 denotes a car turn-down wheel that is rotatably provided at the lower part of the side surface 2a of the car 2 so that the rotation axis is parallel to the side surface 2a of the car 2. A car turnback wheel 9 is rotatably provided on the lower side of the other side 2b of the car 2 so as to be parallel to the rotation axis of the car turnover wheel 7, and 9 is rotatably provided on the upper portion of the counterweight 3. The counterweight return wheel 10 is provided as a driving sheave for a hoisting machine (not shown) provided in a pit portion in the hoistway 1, and 11 and 12 are provided rotatably at the top of the hoistway 1. It is a top return car. The main rope 4 having one end elastically connected to the hoistway fixing body 13 at the top of the hoistway 1 is provided with a counterweight return wheel 9, a top return wheel 11, and a driving sheave 10 from the one end side. The top turn wheel 12, the car turnback wheel 7 and the car turnover wheel 8 are sequentially wound and changed in direction, and the other end is elastically connected to another hoistway fixing body 14 at the top of the hoistway 1. It is supported.

  That is, in the elevator apparatus, a hoisting machine that drives the car 2 is provided in the hoistway 1, and the main rope 4 is folded upward by the car lowering wheels 7 and 8 provided in the lower part of the car 2. In addition, a 2: 1 roping type machine room-less elevator apparatus is shown. And by having the said structure, as for the main rope 4, the movable side 4a turned up from the car lowering wheel 7 has the one side surface 2a of the cage | basket | car 2 and a slight gap | interval in this one side surface 2a. Further, the movable side 4b folded upward from the car lowering wheel 8 is arranged along the other side surface 2b with a slight gap from the other side surface 2b of the car 2.

  Here, the car turn-down wheel 7 is arranged on the vertical projection plane in order to prevent the movable side 4a of the main rope 4 folded back from the car turn-down wheel 7 from contacting the one side surface 2a of the car 2. The outer end portion is disposed so as to protrude from the one side surface 2a of the car 2 to the outside of the car 2 by a predetermined distance. Then, in order to prevent the main rope 4 wound around the car turnback wheel 7 from coming off due to vibration or the like when the car 2 is raised or lowered, the main rope 4 is a rope groove 15 (FIGS. 1 to 5) of the car turnover wheel 7. The main rope disengagement stoppers 16 and 17 facing the main rope 4 with a slight gap are provided at a part away from the car lower wheel 7 (not shown in FIG. . Note that the car turn-back wheel 8 has the same configuration as the car turn-over wheel 7, and the outer end protrudes from the other side surface 2 b of the car 2 to the outside of the car 2 by a predetermined distance on the vertical projection plane. The main rope detachment stoppers 18 and 19 are provided on the side and the lower side thereof so as to face the main rope 4 with a slight gap.

  In the elevator apparatus having the above-described configuration, the detection device 20 (first detection device) is provided at the lower portion on the one side surface 2a side and the other side surface 2b side of the car 2, and the upper portion on the one side surface 2a side of the car 2 and the other. The detection device 21 (second detection device) is provided on the upper side of the side surface 2b. Since the configuration on the side surface 2a side of the cage 2 and the configuration on the other side surface 2b side are symmetrical, only the configuration and operation on the one side surface 2a side will be described below, and the configuration on the other side surface 2b side and The operation is omitted.

  Here, in the detection device 20, the movable side 4 a of the main rope 4 which is folded upward from the car turnback wheel 7 and reaches from the car turnback wheel 7 to the top return wheel 12 is moved up and down due to shaking during an earthquake. When the car 2 is raised in this state when it is caught by a projection such as equipment installed in the road 1, it is prepared based on the experimental result that the main rope stopper 16 is first deformed and broken. In the direction above the main rope detachment stop 16 and in the vicinity of the main rope detachment prevention 16 and the lower end of the movable side 4a of the main rope 4 is separated from the one side surface 2a of the car 2 In the embodiment, the amount of displacement displaced in the “frontage direction” is detected. When detecting that the amount of displacement in the frontage direction at the lower end of the movable side 4a of the main rope 4 exceeds a predetermined value, the detection device 20 sends an operation signal to a safety circuit relay (not shown). Is output. An emergency stop device for the car 2 is operated by a safety circuit relay (not shown) to which an operation signal is input from the detection device 20, and the car 2 is stopped in the hoistway 1.

  Here, the detection device 20 has, for example, a predetermined gap with the lower end of the movable side 4a of the main rope 4 and is disposed to face the lower end of the movable side 4a from the direction of the outside of the car 2. The detector 22 is configured to be movable in a direction away from the one side surface 2a of the car 2, and one end portion of the detector 22 is rotatably fixed, so that the detector 22 is attached to one side surface of the car 2. It is comprised from the support part 23 supported by the lower part of 2a. FIG. 4 is a detailed view of part B when the elevator abnormality detection device shown in FIG. 3 is operating, and shows the operating state of the detection device 20. In FIG. 4, for example, when the car 2 rises in a state where the movable side 4 a of the main rope 4 is caught by a protrusion in the hoistway 1, the movable side 4 a of the main rope 4 is separated from the one side surface 2 a of the car 2. First, the lower end of the movable side 4a of the main rope 4a comes into contact with the detector 22. Here, when the car 2 continues to rise, the detector 22 is urged outward by the lower end of the movable side 4a of the main rope 4, and the detector 22 moves (rotates) outward from one end. When the amount of movement (rotation amount) of the detector 22 generated by the biasing of the lower end of the movable side 4a of the main rope 4 reaches a predetermined value, an internal switch (not shown) is operated to the safety circuit relay. Operation signal is output. That is, the detection device 20 having the above-described configuration is configured so that the lower end of the movable side 4a of the main rope 4 is moved by the amount of movement of the detector 22 generated when the lower end of the movable side 4a of the main rope 4 biases the detector 22 outward. Detect displacement.

  On the other hand, the detection device 21 is provided at the upper part of the car 2 based on the fact that when the movable side 4a of the main rope 4 is swayed, the swaying away from the car side return wheel 7 is large. Yes, a portion of the movable side 4a of the main rope 4 that passes near the upper portion of the car 2 is a direction along one side 2a of the car 2 on the vertical projection plane (hereinafter referred to as “depth direction” in the embodiment). ) Is detected. And if this detecting device 21 detects that the amount of displacement in the depth direction of the part of the main rope 4 exceeds a predetermined value, it outputs an operation signal to the safety circuit relay. Note that the emergency stop device of the car 2 is operated by the safety circuit relay to which the operation signal is input from the detection device 20, and the car 2 is stopped in the hoistway 1.

  Here, FIG. 5 is a detail view of the main part of the elevator abnormality detection device according to Embodiment 1 of the present invention, and FIG. 6 is a CC arrow view of the elevator abnormality detection device shown in FIG. An example of the device 21 is shown. 5 and 6, the detection device 21 includes a projector 24 disposed opposite to a part of the movable portion 4 a of the main rope 4 that passes near the upper portion of the car 2, and the main rope 4. And a light receiver 25 disposed so as to be opposed to the light projector 24, with the light projector 24 being provided by the support portion 26 and the light receiver 25 being provided by the support portion 27 on the one side surface 2a of the car 2. Supported at the top. The light projector 24 and the light receiver 25 are arranged so that the light emitted from the light projector 24 faces the frontage direction, and the light receiver 25 detects the light from the light projector 24, so that The amount of displacement in the depth direction is detected. When a plurality of main ropes 4 are wound around the car turnback wheel 7, a pair of light projectors 24 and light receivers 25 are provided for each main rope 4, and the displacement amount of each main rope 4. Are detected independently.

  FIG. 7 is a detailed view of a portion D during operation of the elevator abnormality detection device shown in FIG. 6, and shows the operation state of the detection device 21. In FIG. 7, when a swing occurs on the movable side 4 a of the main rope 4, the movable side 4 a of the main rope 4 is also displaced along the one side surface 2 a of the car 2. And among the movable part 4a of the main rope 4, when the displacement amount of the depth direction of the part which passes the upper part vicinity of the cage | basket 2 exceeds predetermined value, it is interrupted by the movable side 4a of the main rope 4 until then The emitted light from the projector 24 is detected by the light receiver 25, and an operation signal is output to the safety circuit relay.

  Next, the operation of the elevator abnormality detection apparatus having the above configuration will be briefly described. FIG. 8 is a flowchart showing the operation of the elevator abnormality detection apparatus according to Embodiment 1 of the present invention, and shows the operation during an earthquake. In FIG. 8, when an earthquake occurs during normal operation of the elevator (step S101), the shaking of the earthquake is detected by an earthquake detector or the like, and the car 2 is urgently stopped in the hoistway 1. In the following, a case will be described in which the movable side 4a of the main rope 4 is caught by equipment or the like installed in the hoistway 1 due to the shaking of the earthquake (step S102). After the emergency stop of the car 2, in the elevator apparatus, a rescue operation for rescuing passengers in the car 2 and a diagnostic operation for diagnosing whether there are any abnormalities in the various devices of the elevator are performed (step S103).

  Specifically, the car 2 is moved to the nearest landing, the passenger is lowered, and then the car 2 is run at a low speed from the nearest terminal floor to the other terminal floor to diagnose the operation of various devices. If the displacement in the depth direction has already occurred due to the movable side 4a of the main rope 4 being caught by equipment or the like (step S104), the displacement is detected by the detection device 21 (step S105), and the safety circuit After the operation (step S106), the elevator is stopped (step S107).

  Further, when the car 2 is in an emergency stop state, even when the movable side 4a of the main rope 4 is not displaced, the car 2 is displaced to the movable side 4a of the main rope 4 when the rescue operation or the diagnostic operation is performed. When this occurs (step S104), the displacement is detected by the detection devices 20 and 21 (step S105), and after the safety circuit is operated (step S106), the elevator is stopped (step S107).

  FIG. 9 is a flowchart showing another operation of the elevator abnormality detection apparatus according to Embodiment 1 of the present invention, and shows the operation when the car 2 is shaken for some reason. In FIG. 9, during normal operation of the elevator (step S201), when the passengers in the car 2 are violated (step S202) and the car 2 is shaken or vibrated (step S203), the main rope that suspends the car 2 4 is oscillated on the movable side 4a (step S204). Then, when the detection device 20 or the detection device 21 is operated by this shaking (step S205), the elevator is stopped after the safety circuit operation (step S206) (step S207). The operations of the detection devices 20 and 21 and the operation of the safety circuit relay in FIGS. 8 and 9 are as described above, and the details thereof are omitted here.

  According to the first embodiment of the present invention, the displacement of the movable side 4a of the main rope 4 can be reliably detected by the detection device 20 and the detection device 21, and the main rope 4 is The 2: 1 roping type elevator apparatus folded upward can be easily accommodated. Therefore, the secondary disaster after the earthquake can be prevented in advance. Moreover, it is possible not only after the earthquake but also to easily cope with the swing of the main rope 4 that occurs when the passengers in the car 2 violate during normal operation, and a safer elevator device can be provided. .

  Moreover, since the detecting devices 20 and 21 for detecting the displacement of the main rope 4 are provided in the car 2, even a machine room-less elevator in which sufficient space is not secured at the top of the hoistway 1 can be easily handled. It is possible. The detection means 20 and 21 are not limited to the above configuration, and any configuration may be used as long as the displacement amount in the predetermined direction on the movable side 4a of the main rope 4 can be detected.

  Further, unlike the conventional abnormality detection device, it is not necessary to change the program in the elevator control panel, so that the detection devices 20 and 21, the safety circuit relay, and the connection are added even when the existing elevator is used. Thus, it is possible to complete the elevator repair work, and it is possible to provide an inexpensive service with good workability. That is, the car 2 that moves up and down in the elevator hoistway 1, the car turn-down cars 7 and 8 that are rotatably provided on the lower part of the side face 2 a and the lower part of the other side face 2 b, and the car turn-down car 7. The movable sides 4a and 4b, which are wound around the car 2 and suspended from the car lowering wheels 7 and 8, are folded along the one side 2a and the other side 2b of the car 2. The existing lower (machine room-less) elevator provided with the suspension means, the movable side lower end of the suspension means on the lower side of the one side 2a and the other side 2b of the car 2, and the one side 2a of the car 2 Alternatively, a detection device 20 that detects the amount of displacement displaced in the direction away from the other side surface 2b is newly provided, and the car 2 on the upper side of the side surface 2a and the upper side of the other side surface 2b of the car 2 is placed on the movable side of the suspension means. A part of it that passes near the top of the A detection device 21 for detecting a displacement amount displaced in the direction along the one side surface 2a or the other side surface 2b of the upper cage 2 is newly provided, and the displacement amount in the predetermined direction of the suspension means detected by the detection device 20 and detection A safety circuit relay for stopping the car 2 by operating the emergency stop device of the car 2 when any one of the displacement amounts of the suspension means detected by the device 21 exceeds a predetermined value is newly provided. What is necessary is just to comprise.

It is the schematic which shows the structure of the elevator apparatus in Embodiment 1 of this invention. It is principal part detail drawing which shows the abnormality detection apparatus of the elevator in Embodiment 1 of this invention. It is an AA arrow line view of the abnormality detection apparatus of the elevator shown in FIG. FIG. 4 is a detailed view of a B section during operation of the elevator abnormality detection device shown in FIG. 3. It is principal part detail drawing which shows the abnormality detection apparatus of the elevator in Embodiment 1 of this invention. It is CC arrow line view of the abnormality detection apparatus of the elevator shown in FIG. FIG. 7 is a detailed view of a D section during operation of the elevator abnormality detection device shown in FIG. 6. It is a flowchart which shows operation | movement of the abnormality detection apparatus of the elevator in Embodiment 1 of this invention. It is a flowchart which shows the other operation | movement of the abnormality detection apparatus of the elevator in Embodiment 1 of this invention.

Explanation of symbols

1 hoistway, 2 cage, 2a one side, 2b other side, 3 counterweight,
4 main rope, 4a movable side, 4b movable side, 5 guide rail for car,
6 cage doors, 7 basket downturn cars, 8 car downturn cars, 9 counterweight return cars,
10 drive sheaves, 11 top return wheel, 12 top return wheel, 13 hoistway fixed body,
14 hoistway fixed bodies, 15 ropes, 16 main rope stoppers,
17 Main rope stopper, 18 Main rope stopper, 19 Main rope stopper,
20 detectors, 21 detectors, 22 detectors, 23 support parts,
24 projector, 25 light receiver, 26 support section, 27 support section

Claims (7)

The car going up and down in the elevator hoistway,
A car turn-down wheel provided rotatably at a lower part on one side of the car;
Suspension means that is wound around the car turnover wheel and suspends the car, and the movable side folded upward from the car turnover car is disposed along one side of the car;
A first detection device that is provided at a lower portion on one side of the car and that detects a displacement amount of a movable side lower end of the suspension means displaced in a direction away from one side of the car;
Displacement amount provided in the upper part of one side of the car and part of the movable side of the suspension means passing in the vicinity of the upper part of the car is displaced in the direction along the one side of the car on the vertical projection plane A second detection device for detecting
An elevator abnormality detection device comprising: The car going up and down in the elevator hoistway,
A car turn-down wheel provided rotatably at one side and the other side of the car;
Suspensions that are wound around the respective car turn-down wheels to suspend the car, and whose movable sides folded upward from the respective car turn-down wheels are arranged along one side and the other side of the car, respectively. Means,
A first side that is provided at each of a lower portion on one side surface of the car and a lower portion on the other side surface and detects a displacement amount of each movable side lower end portion of the suspension means displaced in a direction away from one side surface or the other side surface of the car. A detection device;
A part of each of the movable side of the suspension means that is provided on one upper side of the car and on the other side of the car, and passes through the vicinity of the upper part of the car. A second detection device for detecting a displacement amount displaced in a direction along the other side surface;
An elevator abnormality detection device comprising:   When either one of the displacement amount of the suspension means detected by the first detection device and the displacement amount of the suspension means detected by the second detection device exceeds a predetermined value The elevator abnormality detection device according to claim 1 or 2, further comprising a safety circuit relay that operates an emergency stop device for a car to stop the car. The first detector is
A detector that is arranged to face the lower end of the movable side of the suspension means and is movable in a direction away from one side or the other side of the car;
A support part for supporting the detector on a lower part of one side of the cage or a lower part of the other side;
With
The movable-side lower end of the suspension means is determined by the amount of movement of the detector generated by urging the detector when the movable-side lower end portion of the suspension means is displaced in a direction away from one side surface or the other side surface of the car. The elevator abnormality detection device according to any one of claims 1 to 3 , wherein a displacement amount of the part is detected. The second detector is
A projector disposed opposite to a part of the movable side of the suspension means that passes near the upper part of the car;
A light receiver disposed opposite the projector with the suspension means in between;
With
The elevator according to any one of claims 1 to 4 , wherein the amount of displacement of the part of the suspension means is detected by the light receiver detecting light emitted from the projector. Anomaly detection device . The hoistway, the abnormality detecting device for an elevator according to any one of claims 1 to 5, characterized in that the hoisting machine of the elevator is provided. The car going up and down in the elevator hoistway,
A car turn-down wheel provided rotatably at a lower part on one side of the car;
Suspension means that is wound around the car turnover wheel and suspends the car, and the movable side folded upward from the car turnover car is disposed along one side of the car;
To an existing elevator equipped with
A first detection device that detects the amount of displacement of the movable side lower end portion of the suspension means displaced in a direction away from one side surface of the car is provided at a lower portion on one side surface of the car;
An amount of displacement of a part of the movable side of the suspension means that passes near the upper part of the car in the direction along the one side of the car on the vertical projection plane is detected at the upper part of the side of the car. A second detection device is installed,
Either the amount of displacement in the predetermined direction of the suspension means detected by the first detection device or the amount of displacement in the predetermined direction of the suspension means detected by the second detection device exceeds a predetermined value. And a safety circuit relay for stopping the car by operating an emergency stop device for the car in a case where the car is stopped.

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