Elevator system

Abstract

To provide a technology of an elevator device capable of preventing abnormal traveling of a car due to excessive winding in an elevator in which a sheave is not wound around a compensation rope.SOLUTION: An elevator device includes a detection device for detecting that a vertical position of a lowermost part of a compensation rope reaches a position higher than a normal position by a determination height, and a control device for stopping a car when an over-winding state of a main rope is determined based on a detection result of the detection device. Typically, the detection device detects that a detection part arranged so as to straddle the compensation rope from the upper side of the lowermost part at the position of the determination height has moved upward, and the control device determines the over-hoisting state based on the detection result and stops the hoisting machine. Alternatively, the detection device detects an upward load applied to the detection unit, and the control device determines the over-hoisting state and stops the hoisting machine when a load detection value is larger than a determination value.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to an elevator apparatus including a compensating rope. [Background technology]

[0002] Elevators are known that have a compensating rope that hangs down and is connected at both ends to a car and a counterweight. If the counterweight comes into contact with an obstacle or other obstacle during the elevator car's ascent and becomes unable to descend, the car's main rope may become overwound if the traction force is strong.

[0003] Patent Document 1 discloses a technology related to an elevator system that detects such overwinding. The elevator system of this technology includes a connecting rope connected between the car and the counterweight and moved by the elevation of the car and the counterweight; a tension wheel around which the connecting rope is wound and which is pulled by the connecting rope and displaced when the elevation distances of the car and the counterweight are different; a detector that outputs a detection signal when the displacement of the tension wheel reaches a predetermined amount; and a controller that controls the drive of the drive unit based on the input of the detection signal. If an abnormality occurs in which the descent of either the car or the counterweight is blocked by an obstacle and the main rope becomes overwinded, the tension wheel is pulled by the connecting rope and displaced upward. The technology of Patent Document 1 detects overwinding by focusing on the displacement of the tension wheel. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2006 / 022015 Summary of the Invention [Problem to be solved by the invention]

[0005] The elevator system in Patent Document 1 discloses a configuration in which the connecting rope and tension pulley are configured as a compensating rope and sheave. Some elevators equipped with compensating ropes do not have sheaves around which the compensating rope is wound. In such elevators without sheaves, the technology disclosed in Patent Document 1 cannot be applied to detect overwinding by using the connecting rope as a compensating rope.

[0006] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a technology for an elevator device that can prevent abnormal running of a car due to overwinding in an elevator in which a compensating rope is suspended and connected at both ends to a car and a counterweight, respectively, and no sheave is wound around the compensating rope. [Means for solving the problem]

[0007] The elevator system of the present disclosure includes a hoist equipped with 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 whose ends are connected to the car and the counterweight, respectively, and which hangs down in a hoistway, and in an elevator in which no sheave is wound around the compensating rope, the elevator system also includes a detection device that detects when the vertical position of the bottom of the compensating rope has reached a position that is higher than its normal position by a determination height, and a control device that stops the car when it is determined that the main rope is overwound based on the detection result of the detection device. [Effects of the Invention]

[0008] According to the technology disclosed herein, in an elevator in which a compensating rope is suspended with both ends connected to a car and a counterweight, and no sheave is wound around it, it is possible to prevent abnormal running of the car due to overwinding. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic configuration diagram of an elevator device according to a first embodiment. [Figure 2] FIG. 1 is a diagram illustrating an overwinding state of an elevator. [Figure 3] 1 is a diagram for explaining the configuration of a detection device of the elevator apparatus according to the first embodiment. [Figure 4] FIG. 2 is a diagram illustrating some of the functions of the control device. [Figure 5] 3 is a flowchart showing a processing routine executed in the control device of the elevator apparatus in the first embodiment. [Figure 6] FIG. 10 is a diagram illustrating a first modified example of the detection device according to the first embodiment. [Figure 7] FIG. 10 is a diagram illustrating a second modified example of the detection device according to the first embodiment. [Figure 8] 10A and 10B are diagrams showing modified examples of the cross-sectional shape of the detection unit in the longitudinal direction. [Figure 9] FIG. 10 is a diagram illustrating a modification of the hardware resources of the control device. [Figure 10] FIG. 10 is a diagram illustrating another modified example of the hardware resources of the control device. [Figure 11] FIG. 10 is a diagram for explaining the configuration of a detection device of an elevator apparatus according to a second embodiment. [Figure 12] 10 is a flowchart showing a processing routine executed in a control device of an elevator apparatus in a second embodiment. [Figure 13] 10A and 10B are diagrams illustrating modified examples of the arrangement of the load detection unit. [Figure 14] FIG. 10 is a diagram for explaining the configuration of an elevator apparatus according to a third embodiment. [Figure 15] FIG. 10 is a diagram for explaining the configuration of a detection device in an elevator apparatus according to a fourth embodiment. [Figure 16] 13 is a diagram illustrating an example of the operation of the detection device of the elevator apparatus according to the fourth embodiment. [Figure 17] FIG. 10 is a diagram for explaining the configuration of a detection device of an elevator apparatus according to a fifth embodiment. [Figure 18] FIG. 13 is a diagram for explaining the configuration of a detection device in an elevator apparatus according to a sixth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment will be described with reference to the drawings. Note that elements common to the various drawings are given the same reference numerals and redundant explanations will be omitted.

[0011] Embodiment 1 1-1. Schematic configuration of the elevator device according to the embodiment FIG. 1 is a schematic configuration diagram of an elevator device according to a first embodiment. An elevator of the elevator device according to the first embodiment is installed in a facility consisting of a building or the like having multiple floors. An elevator shaft 3 is provided in the facility. The shaft 3 is a vertically long space spanning multiple floors.

[0012] The elevator system mainly comprises a car 2, a counterweight 4, a main rope 6, a control device 10, compensating ropes 12, and a detection device 20. The car 2 travels up and down in the elevator shaft 3, which is the direction of travel, to transport passengers and other people inside the car between multiple floors.

[0013] The counterweight 4 moves up and down the hoistway 3. The car 2 and counterweight 4 are suspended in the hoistway 3 by a main rope 6. The main rope 6 is also called the main line and is wound around a sheave of a hoisting machine 8 installed at the top of the hoistway 3. When the sheave of the hoisting machine 8 rotates, the main rope 6 moves in a direction corresponding to the direction in which the sheave rotates. The car 2 rises or falls depending on the direction in which the main rope 6 moves. The movement of the car 2 and counterweight 4 is guided by guide rails (not shown) fixed inside the hoistway 3.

[0014] 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, opening and closing of the doors, management of registered calls, running of the car 2 in response to calls, stopping running of the car 2 when an abnormality occurs, issuing an alarm, etc.

[0015] The compensating ropes 12 are used to compensate for weight imbalances in the main ropes 6 caused by the vertical position of the car 2. The compensating ropes 12 are connected at both ends to the car 2 and the counterweight 4, respectively, and are suspended within the hoistway 3. As a result, the compensating ropes 12 are folded back into a U-shape within the pit of the hoistway 3, which is further below the liftable ranges of the car 2 and the counterweight 4. There are no limitations on the type of compensating rope 12, as long as it is made of a long body such as a chain or wire. Note that the compensating ropes 12 in this embodiment do not have a sheave wound around them at the folded-back bottom.

[0016] The position of the lowest part formed at the U-shaped turnback portion of the compensating ropes 12 rises as the hoist 8 overwinds the main ropes 6. Figure 2 is a diagram for explaining an overwinding state of an elevator. While the car 2 is rising, the counterweight 4 may come into contact with an obstacle such as a buffer 5 and stop. In this case, if the hoist 8 is driven in a direction to raise the car 2, the car 2 may be further wound up depending on the magnitude of traction. When such an overwinding state occurs, the position of the car 2 rises, and the position of the lowest part of the compensating ropes 12 rises accordingly.

[0017] The detection device 20 detects when the vertical position of the bottom of the compensating rope 12 reaches a position higher by a judgment height than normal when no overwinding occurs. The judgment height here is a threshold value for the amount of elevation of the bottom for determining an overwinding state. FIG. 3 is a diagram illustrating the configuration of the detection device of the elevator apparatus of the first embodiment. As shown in FIG. 3, the detection device 20 includes a pair of bases 22, a detection unit 24, and a movement detection unit 26. Each of the pair of bases 22 is fixed to a fixed object in the hoistway 3, for example, a pair of guide rails 14 of the counterweight 4. The detection unit 24 is disposed on the base 22 from above the bottom of the compensating rope 12 at the judgment height, straddling the compensating rope 12, and is configured to be movable upward relative to the base 22. When the bottom of the compensating rope 12 rises due to overwinding and reaches the judgment height, the detection unit 24 is lifted upward by the bottom of the compensating rope 12. The movement detection unit 26 is a device for detecting that the detection unit 24 has moved upward, and is disposed at the contact point between the detection unit 24 and the base 22. There are no limitations on the detection method of the movement detection unit 26. The movement detection unit 26 may be a mechanical switch or a non-contact sensor. When the movement detection unit 26 detects movement of the detection unit 24, it outputs a signal of the detection result to the control device 10.

[0018] The control device 10 has a function for receiving the detection result of the movement detection unit 26 and executing a process to stop the travel of the car 2. FIG. 4 is a diagram showing some of the functions of the control device. The control device 10 has a signal receiving unit 102, a determination unit 104, and a drive control unit 106 as functional blocks for executing processes to realize various functions related to over-hoisting. The signal receiving unit 102 is a functional block for executing a process to receive a detection result signal output from the detection device 20. The determination unit 104 is a functional block for determining an over-hoisting state. The drive control unit 106 is a functional block for executing a process to stop the hoisting machine 8 and stop the elevator car 2 when an over-hoisting state is determined. Specific processes performed by the control device 10 will be described below using a flowchart.

[0019] 1-2. Specific processing performed by the control device of the first embodiment FIG. 5 is a flowchart showing a processing routine executed in the control device of the elevator apparatus according to the first embodiment.

[0020] 5, the determination unit 104 determines whether movement of the detection unit 24 has been detected based on the detection result received by the signal receiving unit 102. If the determination is negative, the processing of this routine is terminated, and if the determination is positive, the processing proceeds to step S102. In S102, the drive control unit 106 stops the hoisting machine 8 to stop the car 2.

[0021] According to the operation of the elevator system as described above, in an elevator in which the sheave is not wound around the compensating rope, an overwinding state can be detected and the car can be stopped, thereby preventing a large load from being applied to various equipment due to overwinding.

[0022] 1-3. Variations The elevator apparatus according to the embodiment may employ the following modified aspects.

[0023] 1-3-1.Detection device 20 The detection device 20 is not limited to the configuration shown in FIG. 3 as long as the detection unit 24 moves as the lowermost part of the compensating rope 12 rises. FIG. 6 is a diagram for explaining a first modified example of the detection device of embodiment 1. In the detection device 20 of the first modified example, one end of the detection unit 24 is rotatably fixed to the base 22. A movement detection unit 26 is disposed at the contact point between the other end of the detection unit 24 and the base. In this configuration, when overwinding occurs and the lowermost part of the compensating rope 12 rises, the free end side of the detection unit 24 rises, and the movement detection unit 26 detects the movement of the detection unit 24.

[0024] 7 is a diagram illustrating a second modified example of the detection device of Embodiment 1. In the detection device 20 of the second modified example, the detection unit 24 includes a first detection unit 241 and a second detection unit 242. One end of the first detection unit 241 and one end of the second detection unit 242 are rotatably fixed to the pair of bases 22, respectively. A movement detection unit 26 is disposed at the contact portion between the other ends of the first detection unit 241 and the second detection unit 242. In this configuration, when overwinding occurs and the bottom part of the compensating rope 12 rises, the free end side of the first detection unit 241 rises, and the movement detection unit 26 detects the movement of the detection unit 24.

[0025] Alternatively, the detection device 20 may be configured as a non-contact sensor that directly detects when the bottom of the compensating rope reaches the reference height. An example of such a non-contact sensor is a laser sensor.

[0026] 1-3-2.Detection unit 24 The cross-sectional shape of the detection unit 24 perpendicular to the longitudinal direction may have various shapes. FIG. 8 shows modified examples of the cross-sectional shape of the detection unit in the longitudinal direction. As shown in (A) in FIG. 8, the cross-sectional shape of the detection unit 24 in the longitudinal direction may be L-shaped. However, if the compensating rope 12 sways, the shape of the detection unit 24 in (A) may cause a large upward force to act upon contact with the compensating rope 12. In this case, the movement detection unit 26 may erroneously determine that the movement of the detection unit 24 is due to overwinding.

[0027] Therefore, as shown in Figure 8 (B), the detection unit 24 may be configured with a circular cross-sectional shape in the longitudinal direction. With this configuration, even if the compensating rope 12 comes into contact due to swinging, the magnitude of the force acting upward is more likely to be smaller than that of the shape shown in Figure 8 (A). This reduces the possibility that the movement detection unit 26 will mistakenly determine that the movement of the detection unit 24 is due to over-winding. Note that the larger the cross-sectional diameter of the detection unit 24, the more effectively it can prevent the compensating rope 12 from getting caught. For example, if the compensating rope 12 is a chain, it is preferable that the cross-sectional diameter of the detection unit 24 be larger than the pitch of the chain.

[0028] As shown in FIG. 8(C), the detection unit 24 may be configured to be rotatable around a central axis in the longitudinal direction. Such a detection unit 24 may be configured with a cylindrical fixed shaft 243 and a hollow cylindrical rotor 244 that can rotate circumferentially around the fixed shaft 243. The rotor 244 may have a polygonal outer cross section. With this configuration, even if the compensating rope 12 comes into contact with the compensating rope 12 due to swing, the rotor 244 of the detection unit 24 rotates circumferentially, increasing the likelihood that the magnitude of the upward force acting thereon will be even smaller than in the shape shown in FIG. 8(B). This reduces the likelihood that the movement detection unit 26 will erroneously determine that the movement of the detection unit 24 is due to overwinding. The modified example of the detection unit 24 shown in FIG. 8 may also be applied to elevator systems of other embodiments described later.

[0029] 1-3-3.Control device 10 9 is a diagram showing a modified example of the hardware resources of the control device. The control device 10 includes, as its hardware resources, a processing circuit 84 including a processor 80 and a memory 82. The processing circuit 84 may include multiple processors 80. The processing circuit 84 may also include multiple memories 82.

[0030] In this embodiment, the functions of the control device 10 can be realized by software written as a program, firmware, or a combination of software and firmware. The program is stored in memory 82. Alternatively, the program may 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 memory 82 by a processor 80 (computer).

[0031] The processor 80 is also called a CPU (Central Processing Unit), central processing unit, processing unit, arithmetic unit, microprocessor, microcomputer, or DSP. The memory 82 may be a semiconductor memory, a magnetic disk, a flexible disk, an optical disk, a compact disk, a minidisk, or a DVD. Usable semiconductor memory includes RAM, ROM, flash memory, EPROM, EEPROM, etc.

[0032] FIG. 10 is a diagram showing another modified example of the hardware resources of the control device. In the example shown in FIG. 10, the control device 10 includes a processor 80, a memory 82, and a processing circuit 88 including dedicated hardware 86. FIG. 10 shows an example in which some of the functions of the control device 10 are realized by the dedicated hardware 86. All of the functions of the control device 10 may also be realized by the dedicated hardware 86. The dedicated hardware 86 may be a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC, an FPGA, or a combination thereof. Note that the modified example of the control device 10 may also be applied to elevator devices of other embodiments described below.

[0033] 2. Embodiment 2 In the second embodiment, differences from the example disclosed in the first embodiment will be described in particular detail. For features not described in the second embodiment, any of the features of the example disclosed in the first embodiment may be adopted.

[0034] 2-1. Features of the elevator device according to the second embodiment The elevator apparatus of the second embodiment has the same configuration as the elevator apparatus of the first embodiment, except that it includes a detection device 30 instead of the detection device 20 of the elevator apparatus of the first embodiment. FIG. 11 is a diagram for explaining the configuration of the detection device of the elevator apparatus of the second embodiment. As shown in FIG. 11, the detection device 30 includes a pair of bases 32, a detection unit 34, and a load detection unit 36. Each of the pair of bases 32 is fixed to a fixed object within the hoistway 3, for example, to a pair of guide rails 14 of the counterweight 4. The detection unit 34 has both ends fixed to the bases 22 so as to straddle the compensating ropes 12 from above the lowermost part of the compensating ropes 12 at the judgment height. When the lowermost part of the compensating ropes 12 rises due to over-hoisting and reaches the judgment height, the detection unit 34 receives an upward load from the lowermost part of the compensating ropes 12.

[0035] The load detection unit 36 ​​is a device for detecting that an upward load has been applied to the detection unit 34 from the compensating rope 12. There is no limitation on the detection method of the load detection unit 36. The load detection unit 36 ​​is, for example, a load sensor disposed at a portion where the detection unit 34 is fixed to the base 32. The load detection unit 36 ​​detects an upward load applied to the detection unit 34, and outputs the detection result, that is, a load detection value, to the control device 10.

[0036] The control device 10 has a function for executing a process for determining an overwinding state based on the detection result of the load detection unit 36. Specific processes performed by the control device 10 will be described below with reference to a flowchart.

[0037] 2-2. Specific processing performed by the control device of the second embodiment FIG. 12 is a flowchart showing a processing routine executed in the control device of the elevator apparatus according to the second embodiment.

[0038] 12, the signal receiving unit 102 receives a detection result from the detection device 20. The detection result here is a load detection value. After the process of step S200 is executed, the process proceeds to step S202.

[0039] In step S202, the determination unit 104 determines whether the load detection value of the detection result received by the signal receiving unit 102 exceeds a determination value. The determination value here is a threshold value for determining that the lowermost part of the compensating rope 12 has reached the detection unit 34 due to over-hoisting, and is, for example, 0. If the determination is not established, the processing of this routine is terminated, and if the determination is established, the processing proceeds to step S204.

[0040] In step S204, the drive control unit 106 stops the hoisting machine 8 to stop the car 2.

[0041] According to the operation of the elevator device as described above, in an elevator in which no sheave is wound around the compensating rope 12, an overwinding state can be detected based on the load applied from the compensating rope 12 to the detector 34, and the car can be stopped. This makes it possible to prevent a large load from being applied to various equipment due to overwinding.

[0042] 2-3. Variations The elevator system of the second embodiment may employ the following modified aspects.

[0043] 2-3-1. Load detection unit 36 The arrangement of the load detection unit 36 ​​is not limited to the fixed part of the detection unit 34 to the base 32. Fig. 13 shows a modified arrangement of the load detection unit 36. When a load is applied to the detection unit 34 from the lowermost part of the compensating rope 12 due to over-hoisting, the tension of the compensating rope 12 increases due to a reaction. As a result, the following increases: a first downward load acting between the car 2 and the compensating rope 12; a second downward load acting between the counterweight 4 and the compensating rope 12; a third downward load acting on the end of the main rope 6 on the car 2 side; and a fourth downward load acting between the hoisting machine 8 and the building.

[0044] Therefore, as shown in FIG. 13, the load detection unit 36 ​​may be configured as at least one of a load detection unit 36a that detects a first load at the connection between the compensating rope 12 and the car 2, a load detection unit 36b that detects a second load at the connection between the compensating rope 12 and the counterweight 4, a load detection unit 36c that detects a third load at the end of the main rope 6 on the car 2 side, or a load detection unit 36d that detects a fourth load at the installation portion of the hoisting machine 8.

[0045] In this case, the determination unit 104 of the control device 10 calculates the amount of change over time in the load detection value of the first load, the second load, the third load, or the fourth load received by the signal receiving unit 102, and determines whether the calculated amount of change over time exceeds a change amount determination value. The change amount determination value here is a threshold value for determining that the lowest part of the compensating rope 12 has reached the detection unit 34 due to over-winding, and a preset value is used. Even in this process, an over-winding state can be determined, making it possible to prevent a large load from being applied to various devices due to over-winding.

[0046] 3. Embodiment 3 In the third embodiment, differences from the example disclosed in the first embodiment will be described in particular detail. For features not described in the third embodiment, any of the features of the example disclosed in the first embodiment may be adopted.

[0047] 3-1. Features of the elevator device of the third embodiment The compensating rope 12 without the sheave wound around it may sway in the hoistway 3 as the elevator car 2 and counterweight 4 move up and down. If the compensating rope 12 comes into contact with the detecting unit 24 of the detecting device 20 due to the sway, there is a risk of an overwinding being erroneously detected. The elevator device of the third embodiment is characterized in that, in addition to the configuration of the elevator device of the first embodiment, it further includes a configuration for preventing the compensating rope 12 from swaying.

[0048] FIG. 14 is a diagram illustrating the configuration of an elevator apparatus according to a third embodiment. As shown in FIG. 14, the elevator apparatus includes a pair of sway prevention units 40. Each of the pair of sway prevention units 40 is arranged horizontally side by side so as to straddle the compensating rope 12 from above the lowermost part of the compensating rope 12. There are no limitations on the shape, arrangement, number, or installation structure of the sway prevention units 40, as long as they are positioned closer to the compensating rope 12 when stationary than the detecting unit 24 of the detecting device 20. The pair of sway prevention units 40 are each fixed to a fixed object in the hoistway 3, such as a pair of guide rails of the counterweight 4, for example.

[0049] The installation height of the pair of sway prevention units 40 is preferably set to a height that prevents the compensating rope 12 from coming into contact with them when the car 2 stops due to over-winding detection, for example. This configuration prevents erroneous detection of over-winding due to the swaying of the compensating rope 12, and also prevents the up-and-down movement of the bottom of the compensating rope 12 from being hindered, thereby preventing loads from being placed on various devices.

[0050] 3-2. Variations The elevator system of the third embodiment may employ the following modified aspects.

[0051] The anti-sway portions 40 may be configured to be movable upward. With this structure, regardless of the installation height of the pair of anti-sway portions 40, it is possible to prevent the movement of the lowermost portion of the compensating rope 12 in the up and down direction from being impeded.

[0052] The elevator apparatus of the third embodiment may be configured to further include the configuration of a vibration prevention unit 40 in addition to the configuration of the elevator apparatus of the second embodiment.

[0053] 4. Embodiment 4 In the fourth embodiment, differences from the example disclosed in the first embodiment will be described in particular detail. For features not described in the fourth embodiment, any of the features of the example disclosed in the first embodiment may be adopted.

[0054] 4-1. Features of the elevator device of the fourth embodiment When elongation occurs in the main ropes 6 over time, the position of the bottom of the compensating ropes 12 drops. In this case, the height from the bottom of the compensating ropes 12 to the detecting unit 24 of the detecting device 20 increases, which may reduce the accuracy of overwinding detection. The elevator apparatus of the fourth embodiment is characterized by a structure that lowers the height of the detecting unit 24 of the detecting device 20 in accordance with the elongation of the main ropes 6 over time.

[0055] Fig. 15 is a diagram illustrating the configuration of a detection device of an elevator apparatus according to embodiment 4. As shown in Fig. 15, each of a pair of bases 22 of detection device 20 includes a first member 221, a second member 222, and a third member 223.

[0056] The first member 221 is fixed to a fixed object in the elevator shaft 3. The second member 222 is attached to the first member 221 so that it maintains its position relative to the first member 221 by frictional force when no external force is applied, and slides downward when a load equal to or greater than a specified value that exceeds the downward frictional force is applied. A detection unit 24 is fixed to the second member 222.

[0057] The third member 223 is a planar member that protrudes horizontally from the second member 222 toward the lowermost portion of the compensating rope 12. The third member 223 extends to a position that overlaps at least with the lowermost portion of the compensating rope 12 in a vertical projection plane.

[0058] FIG. 16 is a diagram illustrating an example of the operation of the detection device of the elevator apparatus according to the fourth embodiment. When elongation occurs in the main ropes 6 over time, the lowermost part of the compensating rope 12 gradually moves downward and comes into contact with the third member 223. When the load of the compensating rope 12 is applied to the third member 223, the detecting part 24 of the third member 223 moves downward together with the second member 222. Because the detecting part 24 is fixed to the second member 222, the vertical positional relationship between the lowermost part of the compensating rope 12 and the detecting part 24 is maintained even if elongation occurs in the main ropes 6 over time. This prevents a decrease in the accuracy of over-winding detection.

[0059] 4-2. Variations The elevator system of the fourth embodiment may employ the following modified aspects.

[0060] The elevator apparatus of the fourth embodiment is not limited to being combined with the elevator apparatus of the first embodiment, and may be combined with the configuration of the elevator apparatus of the second or third embodiment.

[0061] 5. Embodiment 5. In the fifth embodiment, differences from the example disclosed in the first embodiment will be described in particular detail. For features not described in the fifth embodiment, any of the features of the example disclosed in the first embodiment may be adopted.

[0062] 5-1. Features of the elevator device of the fifth embodiment If the main ropes 6 elongate over time or the compensating ropes 12 fall off, the position of the lowest part of the compensating ropes 12 will drop. If this state is left unattended, there is a risk of an over-hoisting being erroneously detected. The elevator apparatus of the fifth embodiment is characterized by a configuration that detects the descent of the lowest part of the compensating ropes 12 due to elongation of the main ropes 6 over time.

[0063] FIG. 17 is a diagram illustrating the configuration of a detection device of an elevator apparatus according to a fifth embodiment. As shown in FIG. 17, the elevator apparatus according to the fifth embodiment includes a limit detection device 50. The limit detection device 50 is disposed vertically below the lowermost part of the compensating rope 12 and functions as a contact sensor that detects contact of the lowermost part. The limit detection device 50 is disposed at a height limit position that is a predetermined height below the detection unit 24, which is the height of the lowermost part of the compensating rope 12 at which the detection device 20 may erroneously detect over-hoisting. When the limit detection device 50 detects contact of the lowermost part of the compensating rope 12, it outputs a limit signal to the control device 10. The limit detection device 50 may be a device using another detection method, such as a non-contact sensor, as long as it is configured to detect that the lowermost part of the compensating rope 12 has descended to the limit position.

[0064] The control device 10 stops the elevator car 2 when it receives a limit signal output from the limit detection device 50. This process can prevent the detection device 20 from erroneously detecting overwinding.

[0065] 5-2. Variations The elevator system of the fifth embodiment may employ the following modified aspects.

[0066] The elevator system of the fifth embodiment is not limited to being combined with the elevator system of the first embodiment, and may be combined with the configuration of any of the elevator systems of the second to fourth embodiments.

[0067] 6. Embodiment 6 In the sixth embodiment, differences from the example disclosed in the first embodiment will be described in particular detail. For features not described in the sixth embodiment, any of the features of the example disclosed in the first embodiment may be adopted.

[0068] 6-1. Features of the elevator device of the sixth embodiment The elevator apparatus of the sixth embodiment is characterized by a configuration for detecting the detachment of the compensating rope 12.

[0069] Fig. 18 is a diagram for explaining the configuration of a detection device of the elevator apparatus according to embodiment 6. As shown in Fig. 18, the elevator apparatus according to embodiment 6 includes at least one of abnormality detection devices 60a and 60b that detect the occurrence of an abnormality in which the compensating rope 12 falls off the car 2 or the counterweight 4.

[0070] The abnormality detection device 60a is provided at the connection between the compensating ropes 12 and the counterweight 4. When the compensating ropes 12 fall off the car 2, the load applied from the compensating ropes 12 to the counterweight 4 increases. The abnormality detection device 60a is configured, for example, as a load detection device that detects the load applied from the compensating ropes 12 to the counterweight 4. Alternatively, the abnormality detection device 60a detects that the compensating ropes 12 have fallen off the counterweight 4 by a contact switch or a non-contact sensor. The detection result of the abnormality detection device 60a is output to the control device 10.

[0071] The abnormality detection device 60b is provided at the connection between the compensating ropes 12 and the car 2. When the compensating ropes 12 fall off the counterweight 4, the load applied from the compensating ropes 12 to the car 2 increases. The abnormality detection device 60a is configured, for example, as a load detection device that detects the load applied from the compensating ropes 12 to the car 2. Alternatively, the abnormality detection device 60b detects that the compensating ropes 12 have fallen off the car 2 by a contact switch or a non-contact sensor. The detection result of the abnormality detection device 60b is output to the control device 10.

[0072] The control device 10 stops the elevator car 2 when it receives a detection result from the abnormality detection devices 60a, 60b indicating that the compensating rope 12 has fallen off. According to this processing, it is possible to detect a state in which the detection device 20 cannot detect overwinding and stop the running of the car 2.

[0073] 6-2. Variations The elevator system of the sixth embodiment may employ the following modified aspects.

[0074] The elevator system of the sixth embodiment is not limited to being combined with the elevator system of the first embodiment, and may be combined with the configuration of any of the elevator systems of the second to fourth embodiments.

[0075] 7.Other Although the preferred embodiments have been described in detail above, the present disclosure is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the claims.

[0076] Various aspects of the present disclosure are summarized below as appendices.

[0077] (Appendix 1) An elevator comprising: a hoist 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 whose ends are connected to the car and the counterweight, respectively, and suspended in a hoistway, wherein no sheave is wound around the compensating rope; a detection device that detects when the vertical position of the bottom of the compensating rope reaches a position that is higher by a determination height than the normal position; a control device that stops the car when an overwinding state of the main rope is determined based on the detection result of the detection device; An elevator device comprising: (Appendix 2) The detection device includes: a base portion fixed to a fixed object of the elevator shaft; a detection unit disposed at the judgment height position so as to straddle the compensating rope from above the lowermost portion of the compensating rope, the detection unit being movable upward relative to the base; a movement detection unit that detects that the detection unit has moved upward; Equipped with The control device a determination unit that determines the overwinding state based on the detection result of the movement detection unit; a drive control unit that stops the hoist when the determination unit determines that the overwinding state is present; and Equipped with 10. The elevator apparatus of claim 1. (Appendix 3) The detection device includes: a base portion fixed to a fixed object of the elevator shaft; a detection unit fixed to the base so as to straddle the compensating rope from above the lowermost portion of the compensating rope at the determination height; a load detection unit that detects that an upward load is applied to the detection unit from the compensating rope; Equipped with The control device a determination unit that determines the overwinding state based on the detection result of the load detection unit; a drive control unit that stops the hoist when the determination unit determines that the overwinding state is present; and 2. The elevator apparatus of claim 1, comprising: (Appendix 4) the load detection unit is configured to detect an upward load applied to the detection unit from the compensating rope, and to output the detected load detection value as the detection result, The determination unit When the load detection value is greater than a determination value, the overwinding state is determined. 4. The elevator apparatus according to claim 3, configured as follows: (Appendix 5) 5. The elevator apparatus according to claim 2, wherein the detection unit has a circular cross section perpendicular to the longitudinal direction. (Appendix 6) 6. The elevator apparatus according to claim 2, wherein the detection unit is configured to be rotatable about a central axis in a longitudinal direction. (Appendix 7) 7. The elevator apparatus according to any one of Supplementary Note 2 to Supplementary Note 6, further comprising a pair of anti-sway units arranged horizontally above the position of the detection unit and spanning the inside of the hanging compensating rope. (Appendix 8) The pair of vibration-preventing portions are configured to be movable upward. 8. The elevator apparatus of claim 7. (Appendix 9) The base portion is a first member fixed to a fixed object in the elevator shaft; a second member attached to the first member so as to maintain a relative position with respect to the first member by friction when no external force is applied, and to slide downward when a downward load equal to or greater than a specified value is applied; a third member protruding from the second member below the lowest portion of the compensating rope so as to overlap at least the lowest portion of the compensating rope in a vertical projection plane, The detection unit is fixed to the second member. 9. The elevator apparatus according to any one of Supplementary Note 2 to Supplementary Note 8, configured as follows: (Appendix 10) a limit detection device that detects when the lowermost part of the compensating rope reaches a limit position below the detection part, The control device stops the hoist when the limit detection device detects that the bottom has reached the limit position. 10. The elevator apparatus according to any one of Supplementary Note 2 to Supplementary Note 9, configured as follows: (Appendix 11) an abnormality detection device that detects the occurrence of an abnormality in which the compensating rope falls off from the car or the counterweight, The control device stops the hoist when the abnormality detection device detects the abnormality. 11. The elevator apparatus according to claim 1, wherein the elevator apparatus is configured as follows: [Explanation of symbols]

[0078] 2 car, 3 elevator shaft, 4 counterweight, 5 buffer, 6 main rope, 8 hoist, 10 control device, 12 compensating rope, 14 guide rail, 20 detection device, 22 base, 24 detection unit, 26 movement detection unit, 30 detection device, 32 base, 34 detection unit, 36 load detection unit, 36a, 36b, 36c, 36d load detection unit, 40 sway prevention unit, 50 limit detection device, 60a, 60b abnormality detection device, 80 processor, 82 memory, 84 processing circuit, 86 dedicated hardware, 88 processing circuit, 102 signal receiving unit, 104 determination unit, 106 drive control unit, 221 first member, 222 second member, 223 third member, 241 first detection part, 242 second detection part, 243 fixed shaft, 244 rotating body

Claims

1. An elevator comprising: a hoist 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 whose ends are connected to the car and the counterweight, respectively, and suspended in a hoistway, wherein no sheave is wound around the compensating rope; a detection device that detects when the vertical position of the bottom of the compensating rope reaches a position that is higher by a determination height than the normal position; a control device that stops the car when an overwinding state of the main rope is determined based on the detection result of the detection device; An elevator device comprising:

2. The detection device includes: a base portion fixed to a fixed object of the elevator shaft; a detection unit disposed at the judgment height position so as to straddle the compensating rope from above the lowermost portion of the compensating rope, the detection unit being movable upward relative to the base; a movement detection unit that detects that the detection unit has moved upward; Equipped with The control device a determination unit that determines the overwinding state based on the detection result of the movement detection unit; a drive control unit that stops the hoist when the determination unit determines that the overwinding state is present; and Equipped with 2. The elevator system of claim 1.

3. The detection device includes: a base portion fixed to a fixed object of the elevator shaft; a detection unit fixed to the base so as to straddle the compensating rope from above the lowermost portion of the compensating rope at the determination height; a load detection unit that detects that an upward load is applied to the detection unit from the compensating rope; Equipped with The control device a determination unit that determines the overwinding state based on the detection result of the load detection unit; a drive control unit that stops the hoist when the determination unit determines that the overwinding state is present; and The elevator system of claim 1 .

4. the load detection unit is configured to detect an upward load applied to the detection unit from the compensating rope, and to output the detected load detection value as the detection result, The determination unit When the load detection value is greater than a determination value, the overwinding state is determined.

4. The elevator apparatus according to claim 3, wherein the elevator apparatus is configured as follows:

5. The elevator apparatus according to any one of claims 2 to 4, wherein the detection unit has a circular cross section perpendicular to the longitudinal direction.

6. The elevator apparatus according to claim 2 , wherein the detection unit is configured to be rotatable about a central axis in a longitudinal direction.

7. 5. The elevator apparatus according to claim 2, further comprising a pair of sway prevention units arranged side by side in a horizontal direction above the position of the detection unit and spanning an inner side of the hanging compensating rope.

8. The pair of vibration-preventing portions are configured to be movable upward.

8. The elevator system according to claim 7.

9. The base portion is a first member fixed to a fixed object in the elevator shaft; a second member attached to the first member so as to maintain a relative position with respect to the first member by friction when no external force is applied, and to slide downward when a downward load equal to or greater than a specified value is applied; a third member protruding from the second member below the lowest portion of the compensating rope so as to overlap at least the lowest portion of the compensating rope in a vertical projection plane, The detection unit is fixed to the second member. The elevator apparatus according to any one of claims 2 to 4, wherein the elevator apparatus is configured as follows:

10. a limit detection device that detects when the lowermost part of the compensating rope reaches a limit position below the detection part, The control device stops the hoist when the limit detection device detects that the bottom has reached the limit position. The elevator apparatus according to any one of claims 2 to 4, wherein the elevator apparatus is configured as follows:

11. an abnormality detection device that detects the occurrence of an abnormality in which the compensating rope falls off from the car or the counterweight, The control device stops the hoist when the abnormality detection device detects the abnormality. The elevator apparatus according to any one of claims 1 to 4, wherein the elevator apparatus is configured as follows:

Images