Rail derailment detection device for lifting body

Abstract

To provide an elevating body derailment detection device that can suppress a decline in work efficiency of maintenance personnel.SOLUTION: An elevating body derailment detection device includes a wire 8, a suspension member 9, a detection circuit 14, an arm, and a detection unit 24a. The wire 8 is arranged in parallel with an elevating direction of an elevating body. The suspension member 9 is provided at one end of the wire 8, and is provided with a first conductive part. The detection circuit 14 includes second conductive parts 20a, b that are electrically connected to a first conductor part 19, and a current flows through the first conductive part 19. The arm is arranged on the elevating body, has a hollow part through which the wire 8 is to be passed in parallel with the elevating direction. When the elevating body derails from the guide rail, the hollow part contacts the wires 8 to move the suspension member 9 so as to electrically disconnect the first conductor part 19 from the second conductor parts 20a, b. When the first conductor part 19 is electrically disconnected from the second conductor parts 20a, b, the detection unit 24a detects that the elevating body has derailed from the guide rail.SELECTED DRAWING: Figure 2

Description

Technical Field

[0004] , , ,

[0005] , , ,

[0001] The present disclosure relates to a derailment detection device for an elevator.

Background Art

[0002] Conventional derailment detection devices for elevators include first and second electric wires arranged parallel to the elevating direction of the elevator over substantially the entire length of the hoistway, first and second contacts mounted on the elevator, and a detection unit that detects when the elevator has deviated from the guide rail. The first electric wire is at a positive potential, and the second electric wire is at a ground potential. When the elevator deviates from the guide rail, the first and second contacts mounted on the elevator contact the first and second electric wires, and the first electric wire is electrically connected to the second electric wire through the first and second contacts and the weight frame. The detection unit detects that the elevator has deviated from the guide rail when the first electric wire reaches the same potential as the second electric wire (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The elevator derailment detection device according to this disclosure comprises a wire arranged parallel to the direction of movement of an elevator that moves up and down along a guide rail provided in a hoistway, a suspension member provided at one end of the wire and having a first conductor portion, a detection circuit having a second conductor portion electrically connected to the first conductor portion and through which current flows, and an arm portion provided on the elevator that has a hollow portion through which the wire passes parallel to the direction of movement, and when the elevator derails from the guide rail, the hollow portion contacts the wire to move the suspension member and electrically disconnects the first conductor portion and the second conductor portion. A second conductor section is provided, supporting the suspension member, and a pair of valves that open due to the weight of the suspension member when the wire breaks, electrically disconnecting the first conductor section and the second conductor section. When the first conductor and the second conductor are electrically disconnected, the lifting body has come off the guide rail. , or the wire has been broken. It includes a detection unit that detects [something]. [Effects of the Invention]

[0007] The rail detachment detection device for elevators according to this disclosure can suppress a decrease in the work efficiency of maintenance personnel. [Brief explanation of the drawing]

[0008] [Figure 1] This is a diagram showing the configuration of an elevator system equipped with a rail detachment detection device for the lifting body in Embodiment 1. [Figure 2] This is a diagram showing the configuration of the rail detachment detection device for the lifting body in Embodiment 1. [Figure 3] This is a diagram showing the configuration of the rail-detachment detection device for the lifting body when a wire breaks in Embodiment 1. [Figure 4] This is a cross-sectional view of the arm portion of the rail detachment detection device for the lifting body in Embodiment 1. [Figure 5] This is a diagram showing the configuration of the rail-detachment detection device for the lifting body in Embodiment 1, which detects when the lifting body detaches from the guide rail. [Figure 6] This is a flowchart showing the control of the control unit of the rail detachment detection device for the lifting body in Embodiment 1. [Figure 7] This is a diagram showing the configuration of the rail detachment detection device for the lifting body in Embodiment 2. [Figure 8] This flowchart shows the control of the control unit of the rail detachment detection device for the lifting body in Embodiment 2. [Modes for carrying out the invention]

[0009] Embodiment 1. The elevator system equipped with a rail detachment detection device for the lifting body according to Embodiment 1 will be described in detail below. Note that the same reference numerals in each drawing represent the same or equivalent components.

[0010] As shown in Figure 1, the elevator system comprises a lifting body, guide rails, a hoisting machine 5, a deflection wheel 6, a suspension system 7, and a device for detecting when the lifting body has come off the rails. As shown in Figure 1, a machine room 2 is provided at the top of the hoistway 1. Inside the hoistway 1 are the lifting body, a car 3a, and a counterweight 3b. In the following description, unless otherwise specified, the car 3a and the counterweight 3b will be referred to as the lifting body 3. Also inside the hoistway 1 are the guide rails, a car guide rail 4a and a counterweight guide rail 4b. In the following description, unless otherwise specified, the car guide rail 4a and the counterweight guide rail 4b will be referred to as the guide rail 4. The car 3a moves up and down inside the hoistway 1 along the car guide rail 4a. The counterweight 3b moves up and down inside the hoistway 1 along the counterweight guide rail 4b.

[0011] The machine room 2 is equipped with a hoisting machine 5 and a deflector wheel 6. The hoisting machine 5 has a drive sheave 5a and a motor (not shown), and the motor rotates the drive sheave 5a. A suspension body 7 is wrapped around the drive sheave 5a and the deflector wheel 6. A cage 3a is connected to one end of the suspension body 7, and a counterweight 3b is connected to the other end of the suspension body 7. The lifting body 3 moves up and down within the hoistway 1 as the drive sheave 5a rotates.

[0012] The lifting body derailment detection device includes a wire 8, a hanging lower member 9, a pair of valves 10, a spring 11, a switch 12, an arm portion 13, a detection circuit 14, and a control device 15. As shown in FIG. 1, the wire 8 is provided in the hoistway 1 and is arranged parallel to the lifting direction of the lifting body 3 which is in the vertical direction. A hanging lower member 9 is provided at one end of the wire 8. The other end of the wire 8 is fixed to the ceiling of the hoistway 1.

[0013] The hanging lower member 9 is provided at one end of the wire 8. The hanging lower member 9 is formed in a rectangular parallelepiped shape by an insulator such as rubber, and one end of the wire 8 is attached to its upper surface. As shown in FIG. 2, a first conductor portion 19 of the detection circuit 14 described later is provided on the hanging lower member 9.

[0014] As shown in FIG. 2, the pair of valves 10 is composed of one valve 10a and the other valve 10b, and is installed so that one valve 10a and the other valve 10b face each other. The pair of valves 10 is formed in a plate shape by an insulator such as rubber. One end of the pair of valves 10 is rotatably attached to the column portion 16. On the other end side of the pair of valves 10, a pair of second conductor portions 20 described later are respectively provided. The pair of valves 10 is configured to support the hanging lower member 9 when the wire 8 is not broken, and to rotate and open by the weight of the hanging lower member 9 when the wire 8 is broken. When the pair of valves 10 opens in this way, as shown in FIG. 3, the hanging lower member 9 drops from the pair of valves 10.

[0015] As shown in FIG. 2, the spring 11 which is an elastic member biases the pair of valves 10 so that a pair of second conductor portions 20 described later provided on the pair of valves 10 contact a first conductor portion 19 described later provided on the hanging lower member 9. One end of the spring 11 is fixed to the pair of valves 10, and the other end of the spring 11 is fixed to the column portion 16.

[0016] The switch 12, which is a sensor, detects that the hanging lower member 9 has fallen. As shown in FIG. 3, the switch 12 is provided on the floor of the lifting path 1 so as to be pressed by the hanging lower member 9 when the wire 8 is disconnected and the hanging lower member 9 falls from the pair of valves 10. In other words, the switch 12 is provided on the floor of the lifting path 1 so as to face the lower surface of the hanging lower member 9. The switch 12 detects that the hanging lower member 9 has fallen when it is pressed by the hanging lower member 9. Further, when the switch 12 is pressed by the hanging lower member 9, it outputs a drop detection signal, which is an electric signal indicating that the drop of the hanging lower member 9 has been detected, to the detection unit 24a described later via an input / output interface (not shown).

[0017] FIG. 4 shows a cross-sectional view of the arm portion 13. As shown in FIGS. 1 and 4, the arm portion 13 is formed in a columnar shape having a hollow portion 13a and is provided on the counterweight 3b via a support member 17. Therefore, the arm portion 13 moves up and down in the lifting path 1 as the counterweight 3b moves up and down. Since the wire 8 extends continuously from the upper end to the lower end within the movable range of the arm portion 13, the up and down movement of the arm portion 13 is not hindered by the wire 8.

[0018] As shown in FIG. 4, the arm portion 13 has an annular hollow portion 13a through which the wire 8 passes parallel to the lifting direction of the lifting body 3. When the counterweight 3b is moving up and down along the counterweight guide rail 4b, that is, when the counterweight 3b has not come off the counterweight guide rail 4b, the wire 8 and the hollow portion 13a are not in contact. On the other hand, when the counterweight 3b comes off the counterweight guide rail 4b, the hollow portion 13a contacts the wire 8 and pulls the wire 8. When the wire 8 is pulled, as shown in FIG. 5, the hanging lower member 9 provided at one end of the wire 8 moves upward.

[0019] As shown in FIG. 2, the detection circuit 14 has a first electric wire 18, a first conductor portion 19, a pair of second conductor portions 20, and a second electric wire 21. A current supplied from a power supply unit 23 described later flows through the first electric wire 18. The first electric wire 18 is electrically connected to one of the second conductor portions 20a described later. Further, the first electric wire 18 is covered with a coating made of an insulator.

[0020] The first conductor portion 19 is provided on the suspension member 9. The first conductor portion 19 is formed in a plate shape from a conductor such as copper and is fixed to the lower surface of the suspension member 9.

[0021] The pair of second conductors 20 consists of one second conductor 20a and the other second conductor 20b. The pair of second conductors 20 are made of a conductor such as copper and are provided on the pair of valves 10 so as to cover a portion of the surface of the other end of the pair of valves 10 that is not attached to the column portion 16. Specifically, the pair of second conductors 20 are formed in a U-shape so as to follow the upper, side, and lower surfaces of the other end of the pair of valves 10 and are provided on the other end of the pair of valves 10. The pair of second conductors 20 are electrically connected to the first conductor 19 of the suspension member 9 by contacting it.

[0022] The second wire 21 is electrically connected to the other second conductor portion 20b. The second wire 21 is electrically connected to the first wire 18 via the first conductor portion 19 and the pair of second conductor portions 20. Therefore, the current supplied to the first wire 18 flows to the second wire 21 via the first conductor portion 19 and the pair of second conductor portions 20. In other words, current flows through the detection circuit 14 via the first conductor portion 19 and the pair of second conductor portions 20. Furthermore, the second wire 21 is covered with a sheath made of an insulating material.

[0023] The detection circuit 14 is equipped with an ammeter 22 that measures the current flowing through the second wire 21. When the current value is 0 amperes, the ammeter 22 outputs a current non-detection signal, which is an electrical signal indicating that no current is detected flowing through the second wire 21, to the detection unit 24a (described later) via an input / output interface (not shown).

[0024] As shown in Figure 1, the control device 15 is installed in the machine room 2. As shown in Figure 2, the control device 15 comprises a power supply unit 23 and a control unit 24. The power supply unit 23 is a battery that supplies current to the first electric wire 18.

[0025] The control unit 24 is a device such as a control board composed of a processor including a semiconductor integrated circuit, memory, and input / output interfaces, and controls the entire elevator system. The control unit 24 includes a detection unit 24a and a car control unit 24b.

[0026] The detection unit 24a includes a software module that detects when the counterweight 3b has come off the counterweight guide rail 4b or when the wire 8 has broken, based on a current no-detection signal obtained from the ammeter 22 and a fall detection signal obtained from the switch 12. The detection unit 24a also includes a software module that outputs a train operation stop control command to the car control unit 24b based on the detection. Furthermore, the detection unit 24a includes a software module that outputs a rail derailment detection signal or a wire break detection signal to the alarm 25, which will be described later, based on the detection. The rail derailment detection signal is an electrical signal indicating that the counterweight 3b has come off the rail. The wire break detection signal is an electrical signal indicating that a break in the wire 8 has been detected.

[0027] The cage control unit 24b includes a software module that controls the operation of the elevator body 3 by controlling the hoisting machine 5.

[0028] The alarm 25 is a device that notifies elevator maintenance personnel, etc. For example, it could be an information terminal of a management company that manages the elevator system, an information center of an elevator system maintenance company, or a portable information terminal held by a maintenance worker performing maintenance on the elevator system.

[0029] Next, the operation of this embodiment will be described. Figure 6 is a flowchart showing the control in the control unit 24 of the control device 15.

[0030] In step S1, the detection unit 24a detects that the counterweight 3b has come off the counterweight guide rail 4b or that the wire 8 has broken, based on the current non-detection signal obtained from the ammeter 22. Specifically, the detection unit 24a determines whether or not it has received the current non-detection signal output from the ammeter 22. If the detection unit 24a has not received the current non-detection signal, step S1 is repeated. When the detection unit 24a receives the current non-detection signal, it detects that the counterweight 3b has come off the counterweight guide rail 4b or that the wire 8 has broken, and proceeds to step S2.

[0031] Here, the ammeter 22 outputs a no-current-detection signal in the following two cases. The first is when the counterweight 3b comes off the counterweight guide rail 4b. Specifically, when the counterweight 3b comes off the counterweight guide rail 4b, the hollow portion 13a of the arm portion 13 pulls the wire 8, so that the suspension member 9 provided at one end of the wire 8 moves upward, as shown in Figure 5. When the suspension member 9 moves, the first conductor portion 19 and the pair of second conductor portions 20 of the detection circuit 14 become electrically disconnected, and no current flows in the second wire 21. At this time, the current value measured by the ammeter 22 becomes 0 amperes, and the ammeter 22 outputs a no-current-detection signal.

[0032] The second case is when wire 8 breaks. Specifically, when wire 8 breaks, the suspension member 9 falls from the pair of valves 10, as shown in Figure 3. When the suspension member 9 falls, the first conductor part 19 and the pair of second conductor parts 20 of the detection circuit 14 become electrically disconnected, and no current flows through the second wire 21. At this time, the current value measured by the ammeter 22 becomes 0 amperes, and the ammeter 22 outputs a no-current-detection signal.

[0033] Therefore, in step S1, when the first conductor portion 19 and the pair of second conductor portions 20 are electrically disconnected, the detection unit 24a receives a current non-detection signal from the ammeter 22, thereby detecting that the counterweight 3b has come off the counterweight guide rail 4b or that the wire 8 has broken.

[0034] In step S2, when the detection unit 24a detects that the counterweight 3b has come off the counterweight guide rail 4b or that the wire 8 has broken, it outputs an operation stop control command to the car control unit 24b. When the detection unit 24a outputs an operation stop control command to the car control unit 24b, the car control unit 24b controls the hoisting machine 5 to stop the operation of the lifting body 3.

[0035] In step S3, the detection unit 24a detects, based on the fall detection signal obtained from the switch 12, that the counterweight 3b has come off the counterweight guide rail 4b or that the wire 8 has broken. Specifically, the detection unit 24a determines whether or not it has received the fall detection signal output from the switch 12. The switch 12 outputs a fall detection signal when the wire 8 is broken. In other words, when the wire 8 is broken and the suspension member 9 falls from the pair of valves 10, the switch 12 is pushed down by the suspension member 9 and outputs a fall detection signal. Therefore, when the detection unit 24a receives the fall detection signal, it detects that the wire 8 is broken and proceeds to step S5. On the other hand, when the detection unit 24a has not received the fall detection signal, it detects that the counterweight 3b has come off the counterweight guide rail 4b and proceeds to step S4.

[0036] In step S4, when the detection unit 24a detects that the counterweight 3b has come off the counterweight guide rail 4b, it outputs a rail detachment detection signal to the alarm unit 25. The control unit 24 then terminates processing.

[0037] In step S5, when the detection unit 24a detects that the wire 8 has been broken, it outputs a wire break detection signal to the alarm unit 25. The control unit 24 then terminates the process.

[0038] As described above, in the elevator detachment detection device according to Embodiment 1, when the counterweight 3b detaches from the counterweight guide rail 4b, the wire 8 is pulled by the arm portion 13, and the suspension member 9 moves upward, causing the first conductor portion 19 and the pair of second conductor portions 20 of the detection circuit 14 to become electrically disconnected. The detection unit 24a detects that the counterweight 3b has detached from the counterweight guide rail 4b when the first conductor portion 19 and the pair of second conductor portions 20 are electrically disconnected. With this configuration, there is no need to pass current through the wire 8, which is arranged parallel to the lifting direction of the elevator 3. Therefore, when maintenance personnel work in the elevator shaft 1, they do not need to take care not to come into contact with the wire 8, and a decrease in the work efficiency of maintenance personnel can be suppressed.

[0039] Furthermore, the rail derailment detection device for the lifting body according to Embodiment 1 includes a pair of valves 10 that open due to the weight of the suspension member 9 when the wire 8 breaks, electrically disconnecting the first conductor portion 19 and the pair of second conductor portions 20. The detection unit 24a detects that the counterweight 3b has come off the counterweight guide rail 4b or that the wire 8 has broken when the first conductor portion 19 and the pair of second conductor portions 20 are electrically disconnected. Therefore, it is possible to detect a malfunction of the rail derailment detection device for the lifting body, namely the breakage of the wire 8.

[0040] Furthermore, the rail detachment detection device for the lifting body according to Embodiment 1 is equipped with a switch 12 that detects when the suspension member 9 has fallen. The detection unit 24a detects that the wire 8 has been broken when the first conductor part 19 and the pair of second conductor parts 20 are electrically disconnected and the switch 12 detects that the suspension member 9 has fallen. Also, the detection unit 24a detects that the counterweight 3b has come off the counterweight guide rail 4b when the first conductor part 19 and the pair of second conductor parts 20 are electrically disconnected and the switch 12 has not detected that the suspension member 9 has fallen. In this way, the detection unit 24a can distinguish and detect the rail detachment of the counterweight 3b or the breakage of the wire 8, allowing maintenance personnel to prepare according to the cause of the abnormality when performing maintenance work.

[0041] Furthermore, the elevator derailment detection device according to Embodiment 1 includes a spring 11 that biases a pair of valves 10 so that a pair of second conductors 20 contact the first conductor 19. The wire 8 and suspension member 9 vibrate due to vibrations in the building in which the elevator device is installed, or due to the up and down movement of the elevator 3. When the wire 8 and suspension member 9 vibrate, the first conductor 19 provided on the suspension member 9 may temporarily lose contact with the pair of second conductors 20 provided on the pair of valves 10, resulting in an electrical disconnection. In this way, even though the counterweight 3b has not derailed or the wire 8 has not broken, if the first conductor 19 and the pair of second conductors 20 become electrically disconnected, the detection unit 24a may mistakenly detect the derailment of the counterweight 3b or the wire 8 as broken. However, the spring 11 biases the pair of valves 10 so that the pair of second conductors 20 contact the first conductor 19, thereby preventing the first conductor 19 and the pair of second conductors 20 from becoming electrically disconnected, and preventing the detection unit 24a from mistakenly detecting the detachment of the counterweight 3b from the rail or the breakage of the wire 8.

[0042] Although an example has been described in which the suspension member 9 and the pair of valves 10 are made of an insulator, they may also be covered with a film made of an insulator after they have been formed. By making the surfaces of the suspension member 9 and the pair of valves 10 insulators in this way, maintenance personnel do not need to take care to avoid contact with the suspension member 9 and the pair of valves 10 when working in the elevator shaft 1, and a decrease in the work efficiency of the maintenance personnel can be suppressed.

[0043] In addition, although an example has been described in which the arm portion 13 is attached to the counterweight 3b and it is detected when the counterweight 3b comes off the counterweight guide rail 4b, the arm portion 13 may also be attached to the cage 3a and it may be detected when the cage 3a comes off the cage guide rail 4a.

[0044] Although an example has been described in which the hollow portion 13a of the arm portion 13 is an annular shape, it may also be an elliptical annular shape or a polygonal annular shape, etc.

[0045] Note that the sensor does not have to be the switch 12, as long as it can detect that the suspension member 9 has fallen. For example, it may be a photoelectric sensor or ultrasonic sensor, etc., that is installed on the floor of the elevator shaft 1 so as to face the lower surface of the suspension member 9 and measures the distance to the suspension member 9.

[0046] Furthermore, the pair of second conductor portions 20 do not have to be formed in a U-shape, as long as they can be electrically connected to the first conductor portion 19; for example, they may be formed in a plate shape or an L-shape.

[0047] Although the power supply unit 23 has been described as a battery, it may also be a rechargeable battery that is charged from an external source, or a power supply circuit that converts AC current supplied from a commercial power source (not shown) into DC current or converts voltage.

[0048] Embodiment 2. Embodiment 1 described a rail detachment detection device for a lifting body that includes a switch 12 for detecting when the suspension member 9 has fallen. Embodiment 2 describes a rail detachment detection device for a lifting body that does not include a switch 12. Specifically, it differs from Embodiment 1 in that the detection unit 24a does not distinguish and detect rail detachment of the counterweight 3b or cutting of the wire 8, so the differences will be explained below.

[0049] As shown in Figure 7, the rail detachment detection device for the lifting body in this embodiment does not include a switch 12.

[0050] The detection unit 24a includes a software module that detects, based on a current non-detection signal obtained from the ammeter 22, that the counterweight 3b has come off the counterweight guide rail 4b or that the wire 8 has broken. The detection unit 24a also includes a software module that outputs a train car stop control command to the car control unit 24b based on this detection. Furthermore, the detection unit 24a includes a software module that outputs an abnormality detection signal to the alarm 25 based on this detection. The abnormality detection signal is an electrical signal indicating that the counterweight 3b has come off the rail or the wire 8 has broken.

[0051] Next, the operation of this embodiment will be described. Figure 8 is a flowchart showing the control in the control unit 24 of the control device 15. Step S6 is a process that is executed instead of steps S3 to S5 of Embodiment 1, so it will be described.

[0052] In step S6, when the detection unit 24a detects that the counterweight 3b has come off the counterweight guide rail 4b or that the wire 8 has broken, it outputs an abnormality detection signal to the alarm unit 25. The control unit 24 then terminates processing.

[0053] As described above, in the elevator detachment detection device according to Embodiment 2, when the counterweight 3b detaches from the counterweight guide rail 4b, the wire 8 is pulled by the arm portion 13, and the suspension member 9 moves upward, causing the first conductor portion 19 and the pair of second conductor portions 20 of the detection circuit 14 to become electrically disconnected. The detection unit 24a detects that the counterweight 3b has detached from the counterweight guide rail 4b when the first conductor portion 19 and the pair of second conductor portions 20 are electrically disconnected. With this configuration, there is no need to pass current through the wire 8, which is arranged parallel to the lifting direction of the elevator 3. Therefore, when maintenance personnel work in the elevator shaft 1, they do not need to take care not to come into contact with the wire 8, and a decrease in the work efficiency of maintenance personnel can be suppressed.

[0054] The various aspects of this disclosure are summarized below as an appendix. (Note 1) A wire positioned parallel to the direction of movement of a lifting body that moves up and down along a guide rail installed in the elevator shaft, A suspension member provided at one end of the aforementioned wire, and having a first conductor portion provided therein, A detection circuit having a second conductor portion electrically connected to the first conductor portion, through which current flows; An arm is provided on the lifting body and has a hollow section through which the wire passes parallel to the lifting direction, and when the lifting body deviates from the guide rail, the hollow section comes into contact with the wire to move the suspension member, and electrically disconnects the first conductor section and the second conductor section, When the first conductor portion and the second conductor portion are electrically disconnected, a detection unit detects that the lifting body has come off the guide rail. A rail detachment detection device for a lifting body equipped with the following features. (Note 2) The second conductor portion is provided, and a pair of valves are provided to support the suspension member and open due to the weight of the suspension member when the wire breaks, thereby electrically disconnecting the first conductor portion and the second conductor portion. Furthermore, The detection unit detects that the lifting body has come off the guide rail or that the wire has broken when the first conductor and the second conductor are electrically disconnected. A rail detachment detection device for the lifting body as described in Appendix 1. (Note 3) A sensor that detects when the suspension member falls, Furthermore, The detection unit detects that the wire is broken when the first conductor and the second conductor are electrically disconnected and the sensor detects that the suspension member has fallen, and detects that the lifting body has come off the guide rail when the first conductor and the second conductor are electrically disconnected and the sensor does not detect that the suspension member has fallen. A rail detachment detection device for the lifting body as described in Appendix 2. (Note 4) The second conductor portion provided on the pair of valves is electrically connected to the first conductor portion provided on the suspension member by contacting it. An elastic member that biases the pair of valves so that the second conductor portion contacts the first conductor portion, A rail detachment detection device for a lifting body as described in Appendix 2 or 3, further comprising the above. [Explanation of symbols]

[0055] 1 Hoistway, 3a Car, 3b Counterweight, 4a Car guide rail, 4b Counterweight guide rail, 8 Wire, 9 Suspension member, 10a One valve, 10b Other valve, 11 Spring, 12 Switch, 13 Arm, 14 Detection circuit, 15 Control device, 18 First wire, 20a One second conductor part, 20b Other second conductor part, 21 Second wire, 22 Ammeter, 24 Control unit, 24a Detection unit

Claims

1. A wire positioned parallel to the direction of movement of a lifting body that moves up and down along a guide rail installed in the elevator shaft, A suspension member provided at one end of the aforementioned wire, and having a first conductor portion provided therein, A detection circuit having a second conductor portion electrically connected to the first conductor portion, through which current flows, An arm is provided on the lifting body and has a hollow section through which the wire passes parallel to the lifting direction, and when the lifting body deviates from the guide rail, the hollow section comes into contact with the wire to move the suspension member, and electrically disconnects the first conductor section and the second conductor section, The second conductor portion is provided, supporting the suspension member, and a pair of valves that open due to the weight of the suspension member when the wire breaks, electrically disconnecting the first conductor portion and the second conductor portion. A detection unit that detects when the first conductor and the second conductor are electrically disconnected, that the lifting body has come off the guide rail or that the wire has broken, A rail detachment detection device for a lifting body equipped with the following features.

2. A sensor that detects when the suspension member falls, Furthermore, The detection unit detects that the wire is broken when the first conductor and the second conductor are electrically disconnected and the sensor detects that the suspension member has fallen, and detects that the lifting body has come off the guide rail when the first conductor and the second conductor are electrically disconnected and the sensor does not detect that the suspension member has fallen. A rail detachment detection device for a lifting body according to claim 1.

3. The second conductor portion provided on the pair of valves is electrically connected to the first conductor portion provided on the suspension member by contacting it. An elastic member that biases the pair of valves so that the second conductor portion contacts the first conductor portion, A lifting body detachment detection device according to claim 1 or 2, further comprising:

4. A wire arranged parallel to the direction of movement of a lifting body that moves up and down along a guide rail provided in the elevator shaft, A suspension member provided at one end of the aforementioned wire, and having a first conductor portion provided therein, A detection circuit having a second conductor portion electrically connected to the first conductor portion, through which current flows, An arm provided on the lifting body, which electrically disconnects the first conductor portion and the second conductor portion when the lifting body deviates from the guide rail, The second conductor portion is provided, supporting the suspension member, and a pair of valves that open due to the weight of the suspension member when the wire breaks, electrically disconnecting the first conductor portion and the second conductor portion. A detection unit that detects when the first conductor and the second conductor are electrically disconnected, that the lifting body has come off the guide rail or that the wire has broken, A rail detachment detection device for a lifting body equipped with the following features.

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