Elevator device

Abstract

The present disclosure provides an elevator device capable of preventing abnormal driving of a car caused by overwinding in an elevator in which a compensation rope is not wound around a pulley. The elevator device is provided with: a detection device that detects whether or not the position of the lowermost portion of the compensation rope in the vertical direction reaches a position higher than the normal position by a determination height; and a control device that stops the car when it is determined, on the basis of the detection result of the detection device, that the main cable is in an over-winding state. Typically, the detection device detects whether or not a detection unit disposed so as to span the compensation rope from the upper side of the lowermost portion at the position of the determination height moves upward, and the control device determines an overwinding state on the basis of the detection result and stops the hoist. Alternatively, the detection device detects the upward load applied to the detection unit, and the control device determines that the hoisting machine is in an overwinding state and stops the hoisting machine when the load detection value is greater than the determination value.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to an elevator device provided with a compensating rope. BACKGROUND

[0002] There is known an elevator provided with a compensating rope that is hung down with both ends linked to a car and a counterweight. In the course of ascending of the car of such an elevator, if the counterweight cannot descend due to contact with an obstacle or the like, in the case where the traction force is large, overwinding of the main rope of the car can sometimes be caused further.

[0003] In Patent Literature 1, a technology related to an elevator device that detects such overwinding is disclosed. The elevator device of this technology is provided with a connecting rope that is connected between the car and the counterweight and moves by ascending and descending of the car and the counterweight, a tension pulley that is wound with the connecting rope and can be displaced by being pulled by the connecting rope when the ascending and descending distances of the car and the counterweight are different from each other, a detection section that outputs a detection signal when the displacement amount of the tension pulley reaches a prescribed amount, and a control device that controls driving of a driving device based on input of the detection signal. When an abnormality occurs in which descending of either of the car and the counterweight is stopped by an obstacle and the main rope is overwound, the tension pulley is pulled by the connecting rope and displaced upward. In the technology of Patent Literature 1, overwinding is detected with focus on the displacement amount of this tension pulley.

[0004] PRIOR ART DOCUMENTS

[0005] PATENT LITERATURE

[0006] Patent Literature 1: International Publication No. 2006 / 022015 SUMMARY

[0007] PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] In the elevator device of Patent Literature 1, a structure is disclosed in which the connecting rope and the tension pulley are provided as the compensating rope and the pulley. In an elevator provided with a compensating rope, there is also an elevator that is not provided with a pulley wound with the compensating rope. For an elevator that is not provided with such a pulley, it is not possible to provide the connecting rope as the compensating rope and apply the technology disclosed in Patent Literature 1 to detect overwinding.

[0009] The present disclosure was completed in order to solve the above-described problems, and aims to provide a technology of an elevator device that can prevent abnormal running of a car caused by overwinding in an elevator in which a compensating rope that is hung down with both ends linked to the car and the counterweight is not wound around a pulley.

[0010] MEANS FOR SOLVING THE PROBLEMS

[0011] The elevator device of the present disclosure includes a traction machine including a rope wheel that is rotatable, a main rope that is wound around the rope wheel, a car that is connected to one end of the main rope, a counterweight that is connected to the other end of the main rope, and a compensating rope that is connected to the car and the counterweight at both ends and is suspended in a hoistway, the compensating rope not being wound around a pulley. The elevator device includes a detection device that detects whether a position of a lowermost portion of the compensating rope in a vertical direction reaches a position that is higher than a position in normal times by a determination height, and a control device that stops the car in a case where it is determined based on a detection result of the detection device that the main rope is in an overwinding state.

[0012] Effects of Invention

[0013] According to the technology of the present disclosure, in an elevator in which a compensating rope that is connected to a car and a counterweight at both ends and is suspended is not wound around a pulley, it is possible to prevent abnormal travel of the car caused by overwinding. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a schematic configuration diagram of the elevator device of Embodiment 1.

[0015] Figure 2 is a diagram for explaining an overwinding state of an elevator.

[0016] Figure 3 is a diagram for explaining a configuration of a detection device of the elevator device of Embodiment 1.

[0017] Figure 4 is a diagram showing a part of a function of a control device.

[0018] Figure 5 is a flowchart of a routine showing a process performed in the control device of the elevator device of Embodiment 1.

[0019] Figure 6 is a diagram for explaining a first modification example of the detection device of Embodiment 1.

[0020] Figure 7 is a diagram for explaining a second modification example of the detection device of Embodiment 1.

[0021] Figure 8 is a diagram showing a modification example of a cross-sectional shape in a length direction of a detection portion.

[0022] Figure 9 is a diagram showing a modification example of a hardware resource of a control device.

[0023] Figure 10 is a diagram showing another modification example of a hardware resource of a control device.

[0024] Figure 11is a diagram for explaining the structure of a detection device of the elevator device of Embodiment 2.

[0025] Figure 12 is a flowchart of a routine representing processing executed in the control device of the elevator device of Embodiment 2.

[0026] Figure 13 is a diagram representing a modification example of the configuration of the load detection section.

[0027] Figure 14 is a diagram for explaining the structure of the elevator device of Embodiment 3.

[0028] Figure 15 is a diagram for explaining the structure of a detection device of the elevator device of Embodiment 4.

[0029] Figure 16 is a diagram representing an example of the operation of the detection device of the elevator device of Embodiment 4.

[0030] Figure 17 is a diagram for explaining the structure of a detection device of the elevator device of Embodiment 5.

[0031] Figure 18 is a diagram for explaining the structure of a detection device of the elevator device of Embodiment 6.

[0032] Explanation of Reference Numerals

[0033] 2: car; 3: shaft; 4: counterweight; 5: buffer; 6: main rope; 8: traction machine; 10: control device; 12: compensating rope; 14: guide rail; 20: detection device; 22: base section; 24: detection section; 26: movement detection section; 30: detection device; 32: base section; 34: detection section; 36: load detection section; 36a, 36b, 36c, 36d: load detection section; 40: vibration prevention section; 50: position detection device; 60a, 60b: abnormality detection device; 80: processor; 82: memory; 84: processing circuitry; 86: dedicated hardware; 88: processing circuitry; 102: signal receiving section; 104: determination section; 106: drive control section; 221: first member; 222: second member; 223: third member; 241: first detection section; 242: second detection section; 243: fixed shaft; 244: rotating body. DETAILED DESCRIPTION

[0034] Embodiments will be described below with reference to the accompanying drawings. Furthermore, the same reference numerals are assigned to common elements in each drawing, and overlapping descriptions will be omitted.

[0035] Embodiment 1.

[0036] 1-1. Outline structure of elevator device of embodiment

[0037] Figure 1 Fig. 1 is a schematic configuration view of an elevator device of Embodiment 1. The elevator device of Embodiment 1 is provided in a facility composed of a building or the like having a plurality of floors. In the facility, a hoistway 3 in which an elevator is provided. The hoistway 3 is a space that is long in the up-down direction across the plurality of floors.

[0038] As a main structure, the elevator device is provided with a car 2, a counterweight 4, a main rope 6, a control device 10, a compensating rope 12, and a detection device 20. The car 2 is a device that transports users or the like who get on the inside between the plurality of floors by traveling in the up-down direction as a moving direction in the hoistway 3.

[0039] The counterweight 4 moves up and down in the hoistway 3. The car 2 and the counterweight 4 are suspended to the hoistway 3 by the main rope 6. The main rope 6 is also called a main cable, and is wound around a rope wheel of a hoisting machine 8 provided at an upper portion of the hoistway 3. When the rope wheel of the hoisting machine 8 rotates, the main rope 6 moves in a direction corresponding to the direction in which the rope wheel rotates. The car 2 ascends or descends in accordance with the direction in which the main rope 6 moves. The movement of the car 2 and the counterweight 4 is guided by a guide rail not shown that is fixed in the hoistway 3.

[0040] The control device 10 corresponds to a control panel that controls the operation of the elevator. The operation of the elevator controlled by the control device 10 includes, for example, the opening and closing of a door, the management of registered calls, the traveling of the car 2 in response to the calls, and the stopping of the traveling of the car 2 at the time of an abnormality, reporting, and the like.

[0041] The compensating rope 12 is used to compensate for the weight imbalance of the main rope 6 that occurs due to the position of the car 2 in the up-down direction. The both ends of the compensating rope 12 are connected to the car 2 and the counterweight 4, respectively, and hang down in the hoistway 3. Thereby, the compensating rope 12 is folded back in a U shape in a pit of the hoistway 3 that is lower than each of the up-down ranges of the car 2 and the counterweight 4. The compensating rope 12 is not limited in kind as long as it is composed of a long strip such as a chain or a wire. In addition, the compensating rope 12 of the present embodiment is not wound around a pulley at the lowermost portion of the folded back portion.

[0042] The position of the compensating rope 12 at the lowermost portion of the folded back portion of the U shape is raised by the overwinding of the main rope 6 by the hoisting machine 8. Figure 2 Fig. 2 is a view for explaining an overwinding state of the elevator. During the ascending of the car 2, the counterweight 4 sometimes comes into contact with an obstacle such as a buffer 5 and stops. At this time, if the hoisting machine 8 is driven in the direction in which the car 2 ascends, the car 2 is sometimes further wound up depending on the magnitude of the hoisting force. If such an overwinding state occurs, the position of the car 2 ascends, and therefore the position of the lowermost portion of the compensating rope 12 also ascends.

[0043] The detection device 20 is a device that detects whether the position of the lowermost portion of the compensating rope 12 in the vertical direction reaches a position higher than the normal time when overhauling does not occur by a determination height. The determination height here is a threshold value of the amount of increase in the height of the lowermost portion for determining the overhauling state. Figure 3 is a diagram for explaining the structure of the detection device of the elevator device of Embodiment 1. As shown in Figure 3 , the detection device 20 is provided with a pair of base portions 22, a detection portion 24, and a movement detection portion 26. The pair of base portions 22 are respectively fixed to a pair of rails 14, for example, of the counterweight 4, which is a fixed object in the hoistway 3. The detection portion 24 is disposed at the position of the determination height so as to straddle the compensating rope 12 from the upper side of the lowermost portion of the compensating rope 12 with respect to the base portion 22, and is configured so as to be able to move upward as a whole with respect to the base portion 22. When the lowermost portion of the compensating rope 12 rises due to overhauling and reaches the determination height, the detection portion 24 is lifted upward by the lowermost portion of the compensating rope 12. The movement detection portion 26 is a device for detecting whether the detection portion 24 moves upward, and is disposed at the contact portion of the detection portion 24 and the base portion 22. The detection method of the movement detection portion 26 is not limited. The movement detection portion 26 can be a mechanical switch or a non-contact sensor. The movement detection portion 26 outputs a signal of the detection result to the control device 10 when the movement of the detection portion 24 is detected.

[0044] The control device 10 is provided with a function for performing processing of stopping the travel of the car 2 by accepting the detection result of the movement detection portion 26. Figure 4 is a diagram showing a part of the function provided in the control device. The control device 10 is provided with a signal reception portion 102, a determination portion 104, and a drive control portion 106 as functional blocks for performing processing for realizing various functions related to overhauling. The signal reception portion 102 is a functional block for performing processing of receiving a signal of the detection result output from the detection device 20. The determination portion 104 is a functional block for determining the overhauling state. The drive control portion 106 is a functional block for performing processing of stopping the traction machine 8 to stop the car 2 of the elevator when the overhauling state is determined. Hereinafter, the specific processing performed in the control device 10 will be described using a flowchart.

[0045] 1-2. Specific processing performed in the control device of Embodiment 1

[0046] Figure 5 is a flowchart showing a routine of the processing performed in the control device of the elevator device of Embodiment 1.

[0047] In Figure 5In step S100 of the flowchart shown, the determination section 104 determines whether or not the movement of the detection section 24 is detected based on the detection result received by the signal receiving section 102. As a result, in the case where the determination is not established, the processing of the present routine ends, and in the case where the determination is established, the processing proceeds to step S102. In S102, the drive control section 106 stops the traction machine 8 to stop the car 2.

[0048] According to the operation of the elevator device as described above, in the elevator in which the rope is overwound on the pulley, it is possible to detect the overwinding state to stop the car. Thus, it is possible to prevent the large load from being applied to various devices due to the overwinding.

[0049] 1-3. Modification

[0050] The elevator device of the embodiment can also be modified in the following manner.

[0051] 1-3-1. Detection device 20

[0052] The detection device 20 is not limited to the configuration shown as long as the detection section 24 moves as the lowermost portion of the compensation rope 12 rises. Figure 3 The configuration shown. Figure 6 is a diagram for explaining a first modification of the detection device of Embodiment 1. One end of the detection section 24 of the detection device 20 of the first modification is rotatably fixed to the base section 22. The movement detection section 26 is arranged at the contact portion of the other end of the detection section 24 and the base section. In this configuration, when the overwinding occurs to cause the lowermost portion of the compensation rope 12 to rise, the free end side of the detection section 24 rises, and in conjunction therewith, the movement detection section 26 detects the movement of the detection section 24.

[0053] Figure 7 is a diagram for explaining a second modification of the detection device of Embodiment 1. In the detection device 20 of the second modification, the detection section 24 includes a first detection section 241 and a second detection section 242. One end of each of the first detection section 241 and the second detection section 242 is rotatably fixed to the pair of base sections 22. The movement detection section 26 is arranged at the contact portions of the other ends of the first detection section 241 and the second detection section 242 to each other. In this configuration, when the overwinding occurs to cause the lowermost portion of the compensation rope 12 to rise, the free end side of the first detection section 241 rises, and in conjunction therewith, the movement detection section 26 detects the movement of the detection section 24.

[0054] Alternatively, the detection device 20 can be configured as a non-contact sensor that directly detects whether or not the lowermost portion of the compensation rope reaches the determination height. As such a non-contact sensor, a laser type sensor can be exemplified.

[0055] 1-3-2. Detection section 24

[0056] The cross-sectional shape of the detection portion 24 in the direction perpendicular to the length direction can adopt various shapes. Figure 8 is a drawing showing a modification example of the cross-sectional shape of the detection portion in the length direction. As shown in (A) of Figure 8 , the cross-sectional shape of the detection portion 24 in the length direction can also be configured in an L shape. However, in the case where the compensation rope 12 is vibrated, the shape of the detection portion 24 of (A) can be subjected to a large force in the upward direction by the contact of the compensation rope 12. In this case, there is a possibility that the movement detection portion 26 judges a false detection due to the movement of the detection portion 24 caused by overwinding.

[0057] Therefore, as shown in (B) of Figure 8 , the cross-sectional shape of the detection portion 24 in the length direction can also be configured in a circular shape. According to such a structure, even if the compensation rope 12 contacts due to vibration, the possibility that the size of the force acting in the upward direction is smaller than that of the shape of (A) of the drawing is high. Thereby, it is possible to reduce the possibility that the movement detection portion 26 judges a false detection due to the movement of the detection portion 24 caused by overwinding. In addition, the larger the cross-sectional diameter of the detection portion 24, the more effectively the hooking of the compensation rope 12 is suppressed, and for example, in the case where the compensation rope 12 is a chain, the cross-sectional diameter of the detection portion 24 is preferably larger than the pitch of the chain.

[0058] Further, as shown in (C) of Figure 8 , the detection portion 24 can also be configured to be rotatable around the central axis in the length direction. Such a detection portion 24 can be configured by a fixed shaft 243 of a cylindrical shape and a rotating body 244 of a hollow cylindrical shape rotatable in the circumferential direction with respect to the fixed shaft 243. In addition, the outer diameter cross section of the rotating body 244 can also be configured in a polygonal shape. According to such a structure, even if the compensation rope 12 contacts due to vibration, since the rotating body 244 of the detection portion 24 rotates in the circumferential direction, the possibility that the size of the force acting in the upward direction is smaller than that of the shape of (B) of the drawing is high. Thereby, it is possible to reduce the possibility that the movement detection portion 26 judges a false detection due to the movement of the detection portion 24 caused by overwinding. Further, Figure 8 the modification example of the detection portion 24 shown in

[0059] 1-3-3. Control device 10

[0060] Figure 9 is a drawing showing a modification example of the hardware resources of the control device. The control device 10 is provided with a processing circuit 84 including a processor 80 and a memory 82 as hardware resources. The processing circuit 84 can also include a plurality of processors 80. The processing circuit 84 can also include a plurality of memories 82.

[0061] In the present embodiment, the functions possessed by the control device 10 can be realized by software, firmware, or a combination of software and firmware described as a program. The program is stored in the storage 82. Alternatively, the program can be recorded in a program product such as a computer-readable recording medium. The control device 10 realizes each function by executing the program stored in the storage 82 by the processor 80 (computer).

[0062] The processor 80 is also referred to as a CPU (Central Processing Unit), central processing device, processing device, arithmetic device, microprocessor, microcomputer, or DSP. As the storage 82, a semiconductor memory, a magnetic disk, a floppy disk, an optical disk, a CD, a mini disk, or a DVD can be used. The semiconductor memory includes a RAM, a ROM, a flash memory, an EPROM, an EEPROM, and the like.

[0063] Figure 10 is a diagram showing another modification example of the hardware resources of the control device. In the example shown in Figure 10 The control device 10 has a processing circuit 88 including the processor 80, the storage 82, and the dedicated hardware 86. Figure 10 shows an example in which a part of the functions possessed by the control device 10 is realized by the dedicated hardware 86. The entire functions possessed by the control device 10 can also be realized by the dedicated hardware 86. As the dedicated hardware 86, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC, an FPGA, or a combination thereof can be used. Further, the modification example of the control device 10 can be applied to the elevator devices of the other embodiments described later.

[0064] 2. Embodiment 2

[0065] In Embodiment 2, points different from the example disclosed in Embodiment 1 are described in particular detail. As for the features not described in Embodiment 2, any of the features of the example disclosed in Embodiment 1 can be used.

[0066] 2-1. Features of the elevator device of Embodiment 2

[0067] The elevator device of Embodiment 2 has the same structure as the elevator device of Embodiment 1 except that the detection device 30 is provided instead of the detection device 20 of the elevator device of Embodiment 1. Figure 11 is a diagram for explaining the structure of the detection device of the elevator device of Embodiment 2. As Figure 11As shown, the detection device 30 is provided with a pair of base portions 32, a detection portion 34, and a load detection portion 36. The pair of base portions 32 are respectively fixed to a pair of rails 14 of, for example, the counterweight 4, which is a fixed object in the hoistway 3. The detection portion 34 is fixed to the base portions 22 with both ends spanning the compensating rope 12 from the upper side of the lowermost portion of the compensating rope 12 at a position at which a determination height is determined. When the lowermost portion of the compensating rope 12 rises due to overwinding and reaches the determination height, the detection portion 34 is subjected to a load toward the upper side by the lowermost portion of the compensating rope 12.

[0068] The load detection portion 36 is a device for detecting whether a load toward the upper side is applied to the detection portion 34 from the compensating rope 12. The detection method of the load detection portion 36 is not limited. The load detection portion 36 is, for example, a load sensor disposed at a fixed portion of the detection portion 34 with respect to the base portions 32. The load detection portion 36 detects a load toward the upper side applied to the detection portion 34 and outputs a load detection value as a result of the detection to the control device 10.

[0069] The control device 10 is provided with a function for performing a process of determining an overwinding state by accepting a result of the detection by the load detection portion 36. Hereinafter, a specific process performed in the control device 10 will be described using a flowchart.

[0070] 2-2. Specific process performed in the control device of embodiment 2

[0071] Figure 12 is a flowchart of a routine representing a process performed in the control device of the elevator device of embodiment 2.

[0072] In Figure 12 In step S200 of the flowchart shown, the signal receiving portion 102 receives a detection result from the detection device 20. The detection result here is a load detection value. When the process of step S200 is performed, the process proceeds to step S202.

[0073] In step S202, the determination portion 104 determines whether the load detection value of the detection result received by the signal receiving portion 102 exceeds a determination value. The determination value here is a threshold value for determining that the lowermost portion of the compensating rope 12 reaches the detection portion 34 due to overwinding, and, for example, 0 is used. In a case where the determination is not established, the process of the present routine ends, and in a case where the determination is established, the process proceeds to step S204.

[0074] In step S204, the drive control portion 106 stops the hoisting machine 8 to stop the car 2.

[0075] According to the operation of the elevator device as described above, in the elevator in which the compensating rope 12 is not wound around the pulley, it is possible to detect the overwinding state based on the load applied to the detection portion 34 from the compensating rope 12, and stop the car. Thus, it is possible to prevent a large load from being applied to various devices due to overwinding.

[0076] 2-3. Modified example

[0077] The elevator device of Embodiment 2 can also employ the following modified example.

[0078] 2-3-1. Load detection portion 36

[0079] The configuration of the load detection portion 36 is not limited to the fixed portion of the detection portion 34 with respect to the base portion 32. Figure 13 is a view that shows a modified example of the configuration of the load detection portion 36. When a load is applied to the detection portion 34 from the lowermost portion of the compensating rope 12 due to overwinding, the compensating rope 12 increases in tension due to the reaction. As a result, the first load acting in the downward direction between the car 2 and the compensating rope 12, the second load acting in the downward direction between the counterweight 4 and the compensating rope 12, the third load acting in the downward direction on the terminal of the car 2 side of the main rope 6, and the fourth load acting in the downward direction between the hoisting machine 8 and the building each increase.

[0080] Therefore, as shown in Figure 13 , the load detection portion 36 can also be configured as at least any one of a load detection portion 36a that detects the first load at the connection portion of the compensating rope 12 and the car 2, a load detection portion 36b that detects the second load at the connection portion of the compensating rope 12 and the counterweight 4, a load detection portion 36c that detects the third load at the terminal of the car 2 side of the main rope 6, or a load detection portion 36d that detects the fourth load at the provided portion of the hoisting machine 8.

[0081] In this case, the determination portion 104 of the control device 10 calculates the time change amount of the load detection value of the first load, the second load, the third load, or the fourth load received by the signal reception portion 102, and determines whether the calculated time change amount exceeds a change amount determination value. The change amount determination value here is a threshold value for determining that the lowermost portion of the compensating rope 12 reaches the detection portion 34 due to overwinding, and a value set in advance is used. In such processing, it is also possible to determine the overwinding state, and thus it is possible to prevent a large load from being applied to various devices due to overwinding.

[0082] 3. Embodiment 3.

[0083] In Embodiment 3, points different from the example disclosed in Embodiment 1 are described in particular detail. As for features not described in Embodiment 3, any feature of the example disclosed in Embodiment 1 can be employed.

[0084] 3-1. Features of the elevator device of Embodiment 3

[0085] The compensation rope 12 that is not wound around the pulley sometimes generates vibration within the hoistway 3 in conjunction with the up-and-down movement of the car 2 and the counterweight 4. If the compensation rope 12 comes into contact with the detection portion 24 of the detection device 20 due to the vibration, it is possible that overwinding is erroneously detected. The elevator device of Embodiment 3 is characterized in that it has a structure of a vibration-proof portion of the compensation rope 12 in addition to the structure of the elevator device of Embodiment 1.

[0086] Figure 14 is a view for explaining the structure of the elevator device of Embodiment 3. As shown in Figure 14 , the elevator device is provided with a pair of vibration-proof portions 40. The pair of vibration-proof portions 40 are arranged in the horizontal direction in a manner that spans the compensation rope 12 from above the lowermost portion of the compensation rope 12. The vibration-proof portions 40 are positioned closer to the compensation rope 12 at rest than the detection portion 24 of the detection device 20, and are not limited in shape, arrangement, number, and arrangement structure. The pair of vibration-proof portions 40 are, for example, fixed to a pair of guide rails or the like of the hoistway 3 that are fixed objects.

[0087] Further, the arrangement height of the pair of vibration-proof portions 40 is preferably set to a height that does not come into contact with the compensation rope 12 when the car 2 is stopped due to detection of overwinding. According to such a structure, it is possible to prevent erroneous detection of overwinding due to vibration of the compensation rope 12, and it is possible to prevent the up-and-down movement of the lowermost portion of the compensation rope 12 from being hindered and loads being applied to various devices.

[0088] 3-2. Modified example

[0089] The elevator device of Embodiment 3 can also be in a modified manner as follows.

[0090] The vibration-proof portions 40 can also be configured to be movable upward. According to such a structure, it is possible to prevent the up-and-down movement of the lowermost portion of the compensation rope 12 from being hindered regardless of the arrangement height of the pair of vibration-proof portions 40.

[0091] The elevator device of Embodiment 3 can also be configured to have a structure of the vibration-proof portions 40 in addition to the structure of the elevator device of Embodiment 2.

[0092] 4. Embodiment 4

[0093] In Embodiment 4, points different from the example disclosed in Embodiment 1 are particularly explained in detail. As for features not explained in Embodiment 4, any of the features of the example disclosed in Embodiment 1 can be employed.

[0094] 4-1. Features of the elevator device of Embodiment 4

[0095] When the main rope 6 undergoes annual elongation, the position of the lowermost portion of the compensating rope 12 descends. In this case, the height from the lowermost portion of the compensating rope 12 to the detection portion 24 of the detection device 20 becomes large, and the detection accuracy of the overwinding can decrease. The elevator device of Embodiment 4 is characterized in a structure in which the height of the detection portion 24 of the detection device 20 descends in accordance with the annual elongation of the main rope 6.

[0096] Figure 15 is a view for explaining the structure of the detection device of the elevator device of Embodiment 4. As shown in Figure 15 , the pair of base portions 22 of the detection device 20 are each provided with a first member 221, a second member 222, and a third member 223.

[0097] The first member 221 is fixed to a fixed object in the hoistway 3. The second member 222 is installed to the first member 221 in such a manner that it maintains the relative position with respect to the first member 221 by the frictional force when no external force is applied, and slides downward when a load exceeding a prescribed value toward the lower side is applied. The detection portion 24 is fixed to the second member 222.

[0098] The third member 223 is a planar member that horizontally projects from the second member 222 toward the lowermost portion of the compensating rope 12. The third member 223 extends at least to a position overlapping the lowermost portion of the compensating rope 12 in the vertical projection plane.

[0099] Figure 16 is a view showing an example of the operation of the detection device of the elevator device of Embodiment 4. When the main rope 6 undergoes annual elongation, the lowermost portion of the compensating rope 12 gradually moves downward and comes into contact with the third member 223. If a load of the compensating rope 12 is applied to the third member 223, the detection portion 24 of the third member 223 descends together with the second member 222. Since the detection portion 24 is fixed to the second member 222, the positional relationship in the vertical direction between the lowermost portion of the compensating rope 12 and the detection portion 24 can be maintained even if the main rope 6 undergoes annual elongation. Thus, it is possible to prevent the decrease in the detection accuracy of the overwinding.

[0100] 4-2. Modified Example

[0101] The elevator device of Embodiment 4 can also be adopted in the following modified manner.

[0102] The elevator device of Embodiment 4 is not limited to the combination with the elevator device of Embodiment 1, and can be combined with the structures of the elevator devices of Embodiments 2 or 3.

[0103] 5. Embodiment 5.

[0104] In Embodiment 5, points different from the example disclosed in Embodiment 1 are described in particular detail. As for features not described in Embodiment 5, any of the features of the example disclosed in Embodiment 1 can be employed.

[0105] 5-1. Features of the elevator device of Embodiment 5

[0106] When annual elongation of the main rope 6 or detachment of the compensating rope 12 occurs, the position of the lowermost portion of the compensating rope 12 descends. If such a state is left as it is, there is a possibility that overwinding is erroneously detected. The elevator device of Embodiment 5 is characterized in the structure of detecting the descent of the lowermost portion of the compensating rope 12 due to annual elongation of the main rope 6.

[0107] Figure 17 is a view for explaining the structure of the detection device of the elevator device of Embodiment 5. As shown in Figure 17 , the elevator device of Embodiment 5 is provided with a limit position detection device 50. The limit position detection device 50 is arranged vertically below the lowermost portion of the compensating rope 12, and functions as a contact sensor that detects contact of the lowermost portion. The position of the limit position detection device 50 in the height direction is arranged at a limit position that is a height set in advance below the detection portion 24, with respect to the height of the lowermost portion of the compensating rope 12 at which overwinding is erroneously detected by the detection device 20. The limit position detection device 50 outputs a limit position signal to the control device 10 in a case where contact of the lowermost portion of the compensating rope 12 is detected. The limit position detection device 50 can be a device of other detection methods such as a non-contact sensor, as long as it is a structure that can detect descent of the lowermost portion of the compensating rope 12 to the limit position.

[0108] The control device 10 stops the car 2 in a case where the limit position signal output from the limit position detection device 50 is received. According to such processing, it is possible to prevent a case where overwinding is erroneously detected by the detection device 20.

[0109] 5-2. Modified example

[0110] The elevator device of Embodiment 5 can also employ the following modified example.

[0111] The elevator device of Embodiment 5 is not limited to combination with the elevator device of Embodiment 1, and can be combined with the structure of any of the elevator devices of Embodiments 2 to 4.

[0112] 6. Embodiment 6.

[0113] In Embodiment 6, points different from the example disclosed in Embodiment 1 are described in particular detail. As for features not described in Embodiment 6, any of the features of the example disclosed in Embodiment 1 can be employed.

[0114] 6-1. Features of the elevator device of Embodiment 6

[0115] The elevator device of Embodiment 6 has features in the structure of detecting the falling of the compensating rope 12.

[0116] Figure 18 is a diagram for explaining the structure of the detection device of the elevator device of Embodiment 6. As shown in Figure 18 , the elevator device of Embodiment 6 is provided with at least one of the abnormality detection devices 60a, 60b that detect whether an abnormality in which the compensating rope 12 falls from the car 2 or the counterweight 4 occurs.

[0117] The abnormality detection device 60a is provided at the connection portion of the compensating rope 12 and the counterweight 4. When the compensating rope 12 falls from the car 2, the load applied to the counterweight 4 from the compensating rope 12 increases. The abnormality detection device 60a is configured as, for example, a load detection device that detects the load applied to the counterweight 4 from the compensating rope 12. Alternatively, the abnormality detection device 60a detects whether the compensating rope 12 falls from the counterweight 4 by a contact-type switch or a non-contact-type sensor. The detection result of the abnormality detection device 60a is output to the control device 10.

[0118] The abnormality detection device 60b is provided at the connection portion of the compensating rope 12 and the car 2. When the compensating rope 12 falls from the counterweight 4, the load applied to the car 2 from the compensating rope 12 increases. The abnormality detection device 60a is configured as, for example, a load detection device that detects the load applied to the car 2 from the compensating rope 12. Alternatively, the abnormality detection device 60b detects whether the compensating rope 12 falls from the car 2 by a contact-type switch or a non-contact-type sensor. The detection result of the abnormality detection device 60b is output to the control device 10.

[0119] The control device 10 stops the car 2 of the elevator when receiving the detection result indicating that the falling of the compensating rope 12 is detected from the abnormality detection devices 60a, 60b. According to such processing, it is possible to detect the state in which the detection device 20 cannot detect the overwinding and stop the travel of the car 2.

[0120] 6-2. Modified example

[0121] The elevator device of Embodiment 6 can also employ the following modified example.

[0122] The elevator device of Embodiment 6 is not limited to the combination with the elevator device of Embodiment 1, and can be combined with the structure of any of the elevator devices of Embodiments 2 to 4.

[0123] 7. Other

[0124] The above-described embodiments and the like are merely illustrative and do not limit the present disclosure, and various modifications and replacements can be made to the above-described embodiments and the like without departing from the scope recited in the claims.

[0125] Hereinafter, the modes of the present disclosure are collectively described as an appendix.

[0126] (Appendix 1)

[0127] An elevator device includes a hoisting machine including a rope wheel that is rotatable, a main rope that is wound around the rope wheel, a car that is connected to one end of the main rope, a counterweight that is connected to the other end of the main rope, and a compensating rope that is connected to the car and the counterweight at both ends thereof and is suspended in a hoistway, the compensating rope not being wound around a pulley, wherein

[0128] The elevator device includes:

[0129] a detection device that detects whether a position of a lowermost portion of the compensating rope in a vertical direction reaches a position that is higher than a position in normal times by a determination height, and

[0130] a control device that stops the car in a case where it is determined, based on a detection result of the detection device, that an overwinding state of the main rope occurs.

[0131] (Appendix 2)

[0132] The elevator device according to Appendix 1, wherein

[0133] The detection device includes:

[0134] a base portion that is fixed to a fixed object of the hoistway,

[0135] a detection portion that is configured to straddle the compensating rope from an upper side of the lowermost portion of the compensating rope at the position of the determination height and is movable upward with respect to the base portion, and

[0136] a movement detection portion that detects movement of the detection portion upward,

[0137] The control device includes:

[0138] a determination portion that determines the overwinding state based on a detection result of the movement detection portion, and

[0139] A drive control section stops the traction machine when the determination section determines the overwinding state.

[0140] (Addendum 3)

[0141] The elevator device according to Addendum 1, wherein

[0142] The detection device includes:

[0143] a base fixed to a fixed object of the hoistway;

[0144] a detection section fixed to the base so as to span the compensating rope from above the lowermost portion of the compensating rope at a position of the determination height; and

[0145] a load detection section that detects whether a load toward the upper side is applied to the detection section from the compensating rope,

[0146] The control device includes:

[0147] a determination section that determines the overwinding state based on a detection result of the load detection section; and

[0148] a drive control section that stops the traction machine when the determination section determines the overwinding state.

[0149] (Addendum 4)

[0150] The elevator device according to Addendum 3, wherein

[0151] The load detection section is configured to detect a load toward the upper side applied to the detection section from the compensating rope and output a detected load detection value as the detection result,

[0152] The determination section is configured to determine the overwinding state when the load detection value is greater than a determination value.

[0153] (Addendum 5)

[0154] The elevator device according to any one of Addenda 2 to 4, wherein

[0155] An outer shape of a cross section of the detection section perpendicular to the length direction is circular.

[0156] (Addendum 6)

[0157] The elevator device according to any one of Addenda 2 to 5, wherein

[0158] The detection section is configured to be rotatable around a central axis of the length direction.

[0159] (Addendum 7)

[0160] The elevator device according to any one of appendices 2 to 6, wherein

[0161] The elevator device is provided with a pair of vibration prevention portions that are arranged in a horizontal direction across the inner side of the compensation rope that is hanging down at a position higher than the position of the detection portion.

[0162] (Appendix 8)

[0163] The elevator device according to Appendix 7, wherein

[0164] The pair of vibration prevention portions are configured to be movable upward.

[0165] (Appendix 9)

[0166] The elevator device according to any one of appendices 2 to 8, wherein

[0167] The base portion is provided with:

[0168] a first member that is fixed to a fixed object of the hoistway;

[0169] a second member that is installed to the first member in such a manner that it maintains a relative position with respect to the first member by a frictional force when no external force is applied, and slides downward when a load of a prescribed value or more toward the lower side is received; and

[0170] a third member that protrudes from the second member below the lowermost portion of the compensation rope in such a manner as to overlap at least the lowermost portion of the compensation rope in a vertical projection plane,

[0171] The detection portion is configured to be fixed to the second member.

[0172] (Appendix 10)

[0173] The elevator device according to any one of appendices 2 to 9, wherein

[0174] The elevator device is provided with a limit position detection device that detects whether the lowermost portion of the compensation rope reaches a limit position that is lower than the detection portion,

[0175] The control device is configured to stop the hoisting machine in a case where the limit position detection device detects that the lowermost portion reaches the limit position.

[0176] (Appendix 11)

[0177] The elevator device according to any one of appendices 1 to 10, wherein

[0178] The elevator device is provided with an abnormality detection device that detects whether an abnormality in which the compensation rope falls from the car or the counterweight occurs,

[0179] The control device is configured to stop the traction machine when the abnormality detection device detects the abnormality.

Claims

1. An elevator device comprising: a traction machine having a rotatable sheave; a main rope wound around the sheave; a car connected to one end of the main rope; a counterweight connected to the other end of the main rope; and a compensating rope having its two ends connected to the car and the counterweight respectively and hanging in a shaft, wherein the compensating rope is not wound around a pulley, wherein... The elevator device includes: The detection device detects whether the vertical position of the lowest part of the compensation rope has reached a position higher than the normal position by a predetermined height. as well as A control device that stops the car if it determines, based on the detection result of the detection device, that the main cable is overwound.

2. The elevator device according to claim 1, wherein, The detection device includes: The base, which is fixed to the wellbore; A detection unit, configured to cross the compensation rope from above the lowermost part at the determined height position, and capable of moving upward relative to the base; and A moving detection unit that detects the upward movement of the detection unit. The control device includes: The determination unit determines the overwinding state based on the detection result of the movement detection unit; and The drive control unit stops the traction machine when the determination unit determines that the overwinding state has occurred.

3. The elevator device according to claim 1, wherein, The detection device includes: The base, which is fixed to the wellbore; The detection unit is fixed to the base in such a way that it crosses the compensation rope from the upper side of the lowermost part of the compensation rope at the position of the determined height; as well as The load detection unit detects whether an upward load is applied to it from the compensation rope. The control device includes: The determination unit determines the overwinding state based on the detection result of the load detection unit; as well as The drive control unit stops the traction machine when the determination unit determines that the overwinding state has occurred.

4. The elevator device according to claim 3, wherein, The load detection unit is configured to detect an upward load applied to the detection unit from the compensating rope, and output the detected load value as the detection result. The determination unit is configured to determine the overwinding state when the load detection value is greater than the determination value.

5. The elevator device according to any one of claims 2 to 4, wherein, The cross-section of the detection unit perpendicular to the length direction is circular.

6. The elevator device according to any one of claims 2 to 4, wherein, The detection unit is configured to rotate about a central axis in the length direction.

7. The elevator device according to any one of claims 2 to 4, wherein, The elevator device has a pair of vibration damping parts, which are arranged horizontally, crossing the inside of the hanging compensation rope at a position above the position of the detection part.

8. The elevator device according to claim 7, wherein, The pair of vibration damping parts are configured to move freely upwards.

9. The elevator device according to any one of claims 2 to 4, wherein, The base has: The first component is a fixture fixed to the wellbore; The second component is mounted to the first component in such a way that, when no external force is applied, the second component maintains its relative position to the first component by friction, and when subjected to a load of more than a predetermined value directed downwards, the second component slides downwards. as well as A third component protrudes from the second component below the lowermost portion of the compensating rope, such that it overlaps at least with the lowermost portion of the compensating rope in the vertical projection plane. The detection unit is configured to be fixed to the second component.

10. The elevator device according to any one of claims 2 to 4, wherein, The elevator device includes a limit detection device that detects whether the lowest part of the compensating rope has reached a limit position lower than the detection point. The control device is configured to stop the traction machine when the limit detection device detects that the lowermost part has reached the limit position.

11. The elevator device according to any one of claims 1 to 4, wherein, The elevator system is equipped with an anomaly detection device that detects whether an anomaly has occurred, such as the compensation rope falling off the car or the counterweight. The control device is configured to stop the traction machine when the abnormality detection device detects the abnormality.

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