Elevator device

Abstract

An elevator in which a sheave is not wound around a compensating rope is provided with a technology of an elevator device capable of preventing abnormal running of a car due to overwinding. 【Solution means】The elevator device includes a detection device that detects that the vertical position of the lowermost part of the compensating rope has reached a position higher by a determination height than the normal position, and 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. Typically, the detection device detects that a detection part arranged to straddle the compensating rope from above the lowermost part has moved upward at the position of the determination height, and the control device determines the overwinding state based on the detection result and stops the hoist. Alternatively, the detection device detects an upward load applied to the detection part, and the control device determines the overwinding state and stops the hoist when the load detection value is greater than the determination value.

Description

Technical Field

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

Background Art

[0002] An elevator including a compensating rope whose both ends are respectively connected to a car and a counterweight and is suspended is known. In the ascending process of the car of such an elevator, when the counterweight cannot descend due to contact with an obstacle or the like, overwinding may occur in which the main rope of the car is further wound up when the traction is large.

[0003] Patent Document 1 discloses a technique related to an elevator apparatus that detects such overwinding. The elevator apparatus of this technique includes a connecting rope connected between a car and a counterweight and moved by the ascending and descending of the car and the counterweight, a tension pulley around which the connecting rope is wound and displaceable 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 unit that outputs a detection signal when the displacement amount of the tension pulley reaches a predetermined amount, and a control device that controls the drive of the drive device based on the input of the detection signal. When an abnormality occurs in which the descending of either the car or the counterweight is blocked by an obstacle and the main rope is overwound, the tension pulley is displaced upward by being pulled by the connecting rope. In the technique of Patent Document 1, overwinding is detected by paying attention to the displacement amount of this tension pulley.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the elevator apparatus of Patent Document 1, a configuration is disclosed in which a connecting rope and a deflector sheave are replaced with a compensating rope and a sheave. There are elevators equipped with a compensating rope that do not have a sheave wound around the compensating rope. Such an elevator without a sheave cannot detect overwinding by applying the technology disclosed in Patent Document 1 using the connecting rope as the compensating rope.

[0006] The present disclosure has been made to solve the above-described problems, and an object thereof is to provide a technology for an elevator apparatus that can prevent abnormal running of a car due to overwinding in an elevator in which a sheave is not wound around a compensating rope whose both ends are connected to the car and the counterweight, respectively, and the compensating rope is suspended.

Means for Solving the Problems

[0007] The elevator apparatus of the present disclosure includes a hoisting machine having a rotatable rope sheave, a main rope wound around the rope 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 both ends are connected to the car and the counterweight, respectively, and suspended in a hoistway. In an elevator in which a sheave is not wound around the compensating rope, a detection device that detects that the vertical position of the lowermost part of the compensating rope has reached a position higher by a determination height than the normal position, and 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. And in the above configuration, the detection device includes a base fixed to a fixture in the hoistway, a detection unit disposed so as to straddle the compensating rope from above the lowermost part of the compensating rope at the position of the determination height and movable upward with respect to the base, and a movement detection unit that detects that the detection unit has moved upward. The control device includes a determination unit that determines an overwind state based on the detection result of the movement detection unit, and a drive control unit that stops the hoisting machine when the overwind state is determined by the determination unit. The base includes a first member fixed to a fixture in the hoistway, a second member attached to the first member so as to maintain a relative position with respect to the first member by frictional force when no external force is applied and slide downward when receiving a downward load equal to or greater than a specified value, and a third member protruding from the second member so as to overlap at least the lowermost part of the compensating rope in the vertical projection plane below the lowermost part of the compensating rope. The detection unit is configured to be fixed to the second member. Alternatively, in the above configuration, the detection device includes a base fixed to a fixture in the hoistway, a detection unit fixed to the base so as to straddle the compensating rope from above the lowermost part of the compensating rope at the position of the determination height, and a load detection unit that detects that an upward load has been applied to the detection unit from the compensating rope. The control device includes a determination unit that determines an overwind state based on the detection result of the load detection unit, and a drive control unit that stops the hoisting machine when the overwind state is determined by the determination unit. The base includes a first member fixed to a fixture in the hoistway, a second member attached to the first member so as to maintain a relative position with respect to the first member by frictional force when no external force is applied and slide downward when receiving a downward load equal to or greater than a specified value, and a third member protruding from the second member so as to overlap at least the lowermost part of the compensating rope in the vertical projection plane below the lowermost part of the compensating rope. The detection unit is configured to be fixed to the second member.

Effects of the Invention

[0008] According to the technology of the present disclosure, it is possible to prevent abnormal running of a car due to overwinding in an elevator in which a sheave is not wound around a compensating rope whose both ends are connected to the car and the counterweight, respectively, and the compensating rope is suspended.

Brief Description of the Drawings

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Embodiments for Carrying Out the Invention

[0010] Hereinafter, embodiments will be described with reference to the drawings. In the drawings, the same reference numerals are assigned to common elements, and redundant descriptions are omitted.

[0011] Embodiment 1. 1-1. Schematic Configuration of the Elevator Apparatus According to the Embodiment FIG. 1 is a schematic configuration diagram of an elevator apparatus according to Embodiment 1. The elevator of the elevator apparatus according to Embodiment 1 is installed in a facility such as a building having a plurality of floors. In the facility, an elevator hoistway 3 is provided. The elevator hoistway 3 is a vertically long space extending over a plurality of floors.

[0012] The elevator apparatus mainly includes 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 passengers and the like inside it between a plurality of floors by traveling in the vertical direction, which is the moving direction, in the elevator hoistway 3.

[0013] The counterweight 4 moves up and down in the elevator hoistway 3. The car 2 and the counterweight 4 are suspended in the elevator hoistway 3 by the main rope 6. The main rope 6 is also called a main cable and is wound around the sheave of a hoisting machine 8 installed at the upper part of the elevator 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 according to 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) fixed in the elevator hoistway 3.

[0014] The control device 10 corresponds to a control panel that controls the operation of the elevator. The operations of the elevator controlled by the control device 10 include, for example, opening and closing of the doors, management of registered calls, running of the car 2 in response to calls, and stopping and reporting of the car 2 when an abnormality occurs.

[0015] The compensating rope 12 is for compensating the weight imbalance of the main rope 6 caused by the vertical position of the car 2. Both ends of the compensating rope 12 are respectively connected to the car 2 and the counterweight 4 and are suspended in the hoistway 3. Thereby, the compensating rope 12 is folded back in a U shape in the pit of the hoistway 3, which is further below the respective elevating ranges of the car 2 and the counterweight 4. The compensating rope 12 is not limited to its type as long as it is composed of a long body such as a chain or a wire, for example. Note that a sheave is not wound around the lowermost part of the compensating rope 12 of the present embodiment where it is folded back.

[0016] The lowermost position formed at the U-shaped folded part of the compensating rope 12 rises due to overwinding of the main rope 6 by the hoisting machine 8. FIG. 2 is a diagram for explaining the overwinding state of the elevator. During the ascent of the car 2, the counterweight 4 may come into contact with an obstacle such as a buffer 5 and stop. At this time, when the hoisting machine 8 is driven in the direction of raising the car 2, depending on the magnitude of the traction, the car 2 may be further wound up. When such an overwinding state occurs, since the position of the car 2 rises, the lowermost position of the compensating rope 12 rises accordingly.

[0017] The detection device 20 is a device that detects that the vertical position of the lowermost part of the compensating rope 12 has reached a position higher by the determination height than in the normal state where overwinding has not occurred. The determination height here is a threshold value for the amount of increase in the height of the lowermost part for determining the overwinding state. FIG. 3 is a diagram for explaining the configuration of the detection device of the elevator device according to 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 pair of guide rails 14 of the counterweight 4, for example, as a fixed object in the hoistway 3. The detection unit 24 is disposed on the base 22 so as to straddle the compensating rope 12 from above the lowermost part of the compensating rope 12 at the determination height position, and is configured to be movable upward as a whole with respect to the base 22. When the lowermost part of the compensating rope 12 rises due to overwinding and reaches the determination height, the detection unit 24 is lifted upward by the lowermost part 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 portion between the detection unit 24 and the base 22. There is no limitation 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 the 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 executing a process of stopping the travel of the car 2 in response to the detection result of the movement detection unit 26. FIG. 4 is a diagram showing a part of the functions provided in the control device. The control device 10 includes a signal reception unit 102, a determination unit 104, and a drive control unit 106 as functional blocks for executing processes for realizing various functions related to overwinding. The signal reception unit 102 is a functional block for executing a process of receiving the detection result signal output from the detection device 20. The determination unit 104 is a functional block for determining the overwinding state. The drive control unit 106 is a functional block for executing a process of stopping the hoisting machine 8 and stopping the elevator car 2 when the overwinding state is determined. Hereinafter, the specific processes performed in the control device 10 will be described using a flowchart.

[0019] 1-2. Specific Processing Performed in the Control Device of Embodiment 1 FIG. 5 is a flowchart showing a routine of processing executed in the control device of the elevator device according to Embodiment 1.

[0020] In step S100 of the flowchart shown in FIG. 5, the determination unit 104 determines whether the movement of the detection unit 24 has been detected based on the detection result received by the signal reception unit 102. As a result, if the determination is not established, the processing of this routine ends, and if the determination is established, the processing proceeds to step S102. In S102, the drive control unit 106 stops the hoist 8 to stop the car 2.

[0021] According to the operation of the elevator device as described above, in an elevator in which a sheave is not wound around the compensating rope, an overwind state can be detected and the car can be stopped. Thereby, it is possible to prevent a large load from being applied to various devices due to overwinding.

[0022] 1-3. Modification The elevator device of the embodiment may adopt the following modified modes.

[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 modification of the detection device of Embodiment 1. In the detection device 20 of the first modification, one end of the detection unit 24 is rotatably fixed to the base 22. A movement detection unit 26 is arranged at the contact part between the other end of the detection unit 24 and the base. In such a configuration, when an overwind occurs and the lowermost part of the compensating rope 12 rises, the free end side of the detection unit 24 rises, and accordingly, the movement detection unit 26 detects the movement of the detection unit 24.

[0024] FIG. 7 is a diagram for explaining a second modification of the detection device according to the first embodiment. In the detection device 20 of the second modification, the detection unit 24 includes a first detection unit 241 and a second detection unit 242. One ends of the first detection unit 241 and the second detection unit 242 are rotatably fixed to a pair of base portions 22, respectively. A movement detection unit 26 is disposed at a contact portion between the other ends of the first detection unit 241 and the second detection unit 242. In such a configuration, when overwinding occurs and the lowermost portion of the compensating rope 12 rises, the free end side of the first detection unit 241 rises, and accordingly, 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 that the lowermost portion of the compensating rope has reached the determination height. Examples of such a non-contact sensor include a laser sensor.

[0026] 1-3-2. Detection Unit 24 The cross-sectional shape perpendicular to the longitudinal direction of the detection unit 24 can adopt various shapes. FIG. 8 is a diagram showing a modification of the cross-sectional shape in the longitudinal direction of the detection unit. As shown in (A) in FIG. 8, the detection unit 24 may be configured to have an L-shaped cross-sectional shape in the longitudinal direction. However, when the compensating rope 12 sways, there is a possibility that a large upward force may act on the detection unit 24 in (A) due to contact with the compensating rope 12. In this case, there is a possibility that the movement detection unit 26 may misdetect by determining that it is the movement of the detection unit 24 due to overwinding.

[0027] Therefore, as shown in (B) of FIG. 8, the detection unit 24 may be configured to have a circular cross-sectional shape in the longitudinal direction. According to such a 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 in (A) of the figure. Thereby, the possibility that the movement detection unit 26 misdetects by determining that the detection unit 24 has moved due to overwinding can be reduced. Note that the larger the cross-sectional diameter of the detection unit 24, the more effective it is in suppressing the snagging of the compensating rope 12. For example, when the compensating rope 12 is a chain, it is preferable that the cross-sectional diameter of the detection unit 24 is larger than the pitch of the chain.

[0028] In addition, as shown in (C) of FIG. 8, the detection unit 24 may be configured to be rotatable about the central axis in the longitudinal direction. Such a detection unit 24 can be composed of a cylindrical fixed shaft 243 and a hollow cylindrical rotating body 244 that is rotatable in the circumferential direction with respect to the fixed shaft 243. Note that the outer diameter cross-section of the rotating body 244 may be configured to have a polygonal shape. According to such a configuration, even if the compensating rope 12 comes into contact due to swinging, the rotating body 244 of the detection unit 24 rotates in the circumferential direction, increasing the possibility that the magnitude of the force acting upward is even smaller than that of the shape in (B) of the figure. Thereby, the possibility that the movement detection unit 26 misdetects by determining that the detection unit 24 has moved due to overwinding can be reduced. Note that the modified example of the detection unit 24 shown in FIG. 8 can also be applied to the elevator apparatuses of other embodiments described later.

[0029] 1-3-3. Control Device 10 FIG. 9 is a diagram showing a modified example of the hardware resources of the control device. The control device 10 includes a processing circuit 84 including a processor 80 and a memory 82 as hardware resources. A plurality of processors 80 may be included in the processing circuit 84. A plurality of memories 82 may be included in the processing circuit 84.

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

[0031] The processor 80 is also referred to as a CPU (Central Processing Unit), a central processing unit, a processing unit, an arithmetic unit, a microprocessor, a microcomputer, or a DSP. As the memory 82, a semiconductor memory, a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, or a DVD may be adopted. The adoptable semiconductor memories include RAM, ROM, flash memory, EPROM, and EEPROM, etc.

[0032] FIG. 10 is a diagram showing another modification example of the hardware resources of the control device. In the example shown in FIG. 10, the control device 10 includes a processing circuit 88 including a processor 80, a memory 82, and dedicated hardware 86. FIG. 10 shows an example in which a part of the functions of the control device 10 is realized by the dedicated hardware 86. All of the functions of the control device 10 may 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 adopted. Note that the modification example of the control device 10 can also be applied to the elevator devices of other embodiments described later.

[0033] 2. Embodiment 2. In Embodiment 2, the points different from the example disclosed in Embodiment 1 will be described in particular detail. Regarding the features not described in Embodiment 2, any features of the example disclosed in Embodiment 1 may be adopted.

[0034] 2-1. Features of the Elevator Device According to Embodiment 2 The elevator device according to Embodiment 2 has the same configuration as the elevator device according to Embodiment 1, except that it includes a detection device 30 instead of the detection device 20 of the elevator device according to Embodiment 1. FIG. 11 is a diagram for explaining the configuration of the detection device of the elevator device according to Embodiment 2. 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 pair of guide rails 14 of a counterweight 4, for example, as a fixed object in the hoistway 3. Both ends of the detection unit 34 are fixed to the base 22 so as to straddle the compensating rope 12 from above the lowermost part of the compensating rope 12 at the position of the determination height. When the lowermost part of the compensating rope 12 rises due to overwinding and reaches the determination height, the detection unit 34 receives an upward load by the lowermost part of the compensating rope 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 the fixing portion of the detection unit 34 to the base 32. The load detection unit 36 detects the upward load applied to the detection unit 34 and outputs a load detection value, which is the detection result, to the control device 10.

[0036] The control device 10 has a function for executing a process of determining an overwinding state in response to the detection result of the load detection unit 36. Hereinafter, the specific process performed in the control device 10 will be described using a flowchart.

[0037] 2-2. Specific Process Performed in the Control Device According to Embodiment 2 FIG. 12 is a flowchart showing a routine of a process executed in the control device of the elevator device according to Embodiment 2.

[0038] In step S200 of the flowchart shown in FIG. 12, the signal receiving unit 102 receives the detection result from the detection device 20. The detection result here is the load detection value. When 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 the determination value. The determination value here is a threshold for determining that the lowermost part of the compensating rope 12 has reached the detection unit 34 due to overwinding, and for example, 0 is used. If the determination is not established, the process of this routine ends. If the determination is established, the process proceeds to step S204.

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

[0041] According to the operation of the elevator device as described above, in an elevator in which a sheave is not wound around the compensating rope 12, an overwinding state can be detected based on the load applied from the compensating rope 12 to the detection unit 34, and the car can be stopped. Thereby, it is possible to prevent a large load from being applied to various devices due to overwinding.

[0042] 2-3. Modification The elevator device of the second embodiment may adopt the following modified modes.

[0043] 2-3-1. Load detection unit 36 The arrangement of the load detection unit 36 is not limited to the fixing part to the base part 32 of the detection unit 34. FIG. 13 is a diagram showing a modification of the 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 overwinding, the tension of the compensating rope 12 increases due to the reaction. As a result, the first downward load acting between the car 2 and the compensating rope 12, the second downward load acting between the counterweight 4 and the compensating rope 12, the third downward load acting on the terminal on the car 2 side of the main rope 6, and the fourth downward load acting between the hoisting machine 8 and the building all increase respectively.

[0044] Therefore, as shown in FIG. 13, the load detection unit 36 may be configured as at least any one of a load detection unit 36a that detects the first load at the connection part between the compensating rope 12 and the car 2, a load detection unit 36b that detects the second load at the connection part between the compensating rope 12 and the counterweight 4, a load detection unit 36c that detects the third load at the terminal on the car 2 side of the main rope 6, or a load detection unit 36d that detects the fourth load at the installation part 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 of the load detection value of the first load, the second load, the third load, or the fourth load received by the signal reception unit 102, and determines whether the calculated amount of change over time exceeds the change amount determination value. The change amount 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 overwinding, and a preset value is used. Even in such processing, the overwinding state can be determined, so that a large load can be prevented from being applied to various devices due to overwinding.

[0046] 3. Embodiment 3. In Embodiment 3, the points different from the example disclosed in Embodiment 1 will be described in particular detail. For the features not described in Embodiment 3, any of the features of the example disclosed in Embodiment 1 may be adopted.

[0047] 3-1. Features of the elevator device of Embodiment 3 When the compensating rope 12 around which the sheave is not wound is swayed in the hoistway 3 as the elevator car 2 and the counterweight 4 move vertically. If the compensating rope 12 contacts the detection unit 24 of the detection device 20 due to the sway, there is a risk of false detection of overwinding. The elevator apparatus according to Embodiment 3 is characterized in that, in addition to the configuration of the elevator apparatus according to Embodiment 1, it further includes a configuration of a vibration damper for the compensating rope 12.

[0048] FIG. 14 is a diagram for explaining the configuration of the elevator apparatus according to Embodiment 3. As shown in FIG. 14, the elevator apparatus includes a pair of vibration dampers 40. Each of the pair of vibration dampers 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. The vibration damper 40 is not limited in its shape, arrangement, number, and installation structure as long as it is closer to the compensating rope 12 at rest than the detection unit 24 of the detection device 20. The pair of vibration dampers 40 are respectively fixed to fixed objects in the hoistway 3 such as a pair of guide rails of the counterweight 4.

[0049] Note that the installation height of the pair of vibration dampers 40 is preferably set such that the compensating rope 12 does not come into contact therewith when the car 2 stops due to overwinding detection. According to such a configuration, it is possible to prevent false detection of overwinding due to the sway of the compensating rope 12 and to prevent the vertical movement of the lowermost part of the compensating rope 12 from being hindered and causing a load on various devices.

[0050] 3-2. Modification The elevator apparatus according to Embodiment 3 may adopt the following modified modes.

[0051] The vibration damper 40 may be configured to be movable upward. According to such a structure, it is possible to prevent the vertical movement of the lowermost part of the compensating rope 12 from being hindered regardless of the installation height of the pair of vibration dampers 40.

[0052] In addition to the configuration of the elevator apparatus according to the second embodiment, the elevator apparatus according to the third embodiment may be configured to further include the configuration of the anti-sway unit 40.

[0053] 4. Embodiment 4. In Embodiment 4, differences from the example disclosed in Embodiment 1 will be described in particular detail. For features not described in Embodiment 4, any features of the example disclosed in Embodiment 1 may be adopted.

[0054] 4-1. Features of the elevator apparatus according to Embodiment 4 When secular elongation occurs in the main rope 6, the position of the lowermost part of the compensating rope 12 drops. In this case, the height from the lowermost part of the compensating rope 12 to the detection unit 24 of the detection device 20 increases, and there is a risk that the overwind detection accuracy decreases. The elevator apparatus according to Embodiment 4 is characterized by a structure that lowers the height of the detection unit 24 of the detection device 20 in accordance with the secular elongation of the main rope 6.

[0055] FIG. 15 is a diagram for explaining the configuration of the detection device of the elevator apparatus according to Embodiment 4. As shown in FIG. 15, each of the pair of bases 22 of the 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 fixture in the hoistway 3. The second member 222 is attached to the first member 221 so as to hold the relative position with respect to the first member 221 by frictional force when no external force is applied, and to slide downward when a load equal to or greater than a specified value exceeding the downward frictional force is applied. The 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 part of the compensating rope 12. The third member 223 extends to at least a position overlapping the lowermost part of the compensating rope 12 in the vertical projection plane.

[0058] FIG. 16 is a diagram showing an operation example of the detection device of the elevator apparatus according to the fourth embodiment. When secular elongation occurs in the main rope 6, the lowermost part of the compensating rope 12 gradually moves downward and contacts the third member 223. When the load of the compensating rope 12 is applied to the third member 223, the third member 223 and the detection unit 24 descend together with the second member 222. Since the detection unit 24 is fixed to the second member 222, even if secular elongation occurs in the main rope 6, the vertical positional relationship between the lowermost part of the compensating rope 12 and the detection unit 24 is maintained. This prevents a decrease in the accuracy of overwind detection.

[0059] 4-2. Modification The elevator apparatus according to the fourth embodiment may adopt the following modified modes.

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

[0061] 5. Fifth Embodiment In the fifth embodiment, the points different from the example disclosed in the first embodiment will be described in particular detail. For the 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 Apparatus According to the Fifth Embodiment When secular elongation of the main rope 6 or detachment of the compensating rope 12 occurs, the position of the lowermost part of the compensating rope 12 drops. If such a state is left unattended, there is a risk of false detection of overwind. The elevator apparatus according to the fifth embodiment is characterized in that it has a configuration for detecting the descent of the lowermost part of the compensating rope 12 due to secular elongation of the main rope 6.

[0063] FIG. 17 is a diagram for explaining the configuration of the detection device of the elevator apparatus according to Embodiment 5. As shown in FIG. 17, the elevator apparatus according to Embodiment 5 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 the lowermost contact. The position of the limit detection device 50 in the height direction is set to a limit position that is lower by a preset height than the detection unit 24, as the height of the lowermost part of the compensating rope 12 where the detection device 20 may erroneously detect overwinding. When the limit detection device 50 detects the contact of the lowermost part of the compensating rope 12, the limit detection device 50 outputs a limit signal to the control device 10. The limit detection device 50 may be a device of another detection method such as a non-contact sensor as long as it has a structure capable of detecting that the lowermost part of the compensating rope 12 has descended to the limit position.

[0064] When the control device 10 receives the limit signal output from the limit detection device 50, the control device 10 stops the elevator car 2. According to such processing, it is possible to prevent the detection device 20 from erroneously detecting overwinding.

[0065] 5-2. Modification The elevator apparatus according to Embodiment 5 may adopt the following modified aspects.

[0066] The elevator apparatus according to Embodiment 5 is not limited to the combination with the elevator apparatus according to Embodiment 1, and may be combined with the configuration of any of the elevator apparatuses according to Embodiments 2 to 4.

[0067] 6. Embodiment 6. In Embodiment 6, the points different from the example disclosed in Embodiment 1 will be described in particular detail. Regarding the features not described in Embodiment 6, any of the features of the example disclosed in Embodiment 1 may be adopted.

[0068] 6-1. Features of the Elevator Apparatus According to Embodiment 6 The elevator apparatus according to Embodiment 6 is characterized in having a configuration for detecting the detachment of the compensating rope 12.

[0069] FIG. 18 is a diagram for explaining the configuration of the 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 abnormal detection devices 60a and 60b that detect an abnormality in which the compensating rope 12 has fallen off from the car 2 or the counterweight 4.

[0070] The abnormal detection device 60a is provided at the connection portion between the compensating rope 12 and the counterweight 4. When the compensating rope 12 falls off from the car 2, the load applied to the counterweight 4 from the compensating rope 12 increases. The abnormal 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 abnormal detection device 60a detects that the compensating rope 12 has fallen off from the counterweight 4 by a contact switch or a non-contact sensor. The detection result of the abnormal detection device 60a is output to the control device 10.

[0071] The abnormal detection device 60b is provided at the connection portion between the compensating rope 12 and the car 2. When the compensating rope 12 falls off from the counterweight 4, the load applied to the car 2 from the compensating rope 12 increases. The abnormal 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 abnormal detection device 60b detects that the compensating rope 12 has fallen off from the car 2 by a contact switch or a non-contact sensor. The detection result of the abnormal detection device 60b is output to the control device 10.

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

[0073] 6-2. Modification The elevator device according to Embodiment 6 may adopt the following modified modes.

[0074] The elevator device according to Embodiment 6 is not limited to the combination with the elevator device according to Embodiment 1, and may be combined with the configuration of any of the elevator devices according to Embodiments 2 to 4.

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

[0076] Hereinafter, aspects of the present disclosure will be collectively described as appendices.

[0077] (Appendix 1) A hoist including 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 both ends connected to the car and the counterweight, respectively, and suspended in a hoistway. In an elevator in which no sheave is wound around the compensating rope, a detection device that detects that the vertical position of the lowermost part of the compensating rope has reached a position higher by a determination height than the normal position; a control device that stops the car when an overwind 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 is a base fixed to a fixture in the hoistway; a detection part disposed so as to straddle the compensating rope from above the lowermost part of the compensating rope at the position of the determination height and movable upward with respect to the base; a movement detection part that detects that the upward movement of the detection part has been detected; and includes The control device is 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 overwinding state is determined by the determination unit; and The elevator device according to Supplementary Note 1. (Supplementary Note 3) The detection device includes a base fixed to a fixed object in the hoistway; a detection unit fixed to the base so as to straddle the compensating rope from above the lowermost part of the compensating rope at the position of the determination height; a load detection unit that detects that an upward load has been applied to the detection unit from the compensating rope; and The control device includes 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 overwinding state is determined by the determination unit; and is the elevator device according to Supplementary Note 1. (Supplementary Note 4) The load detection unit is configured to detect an upward load applied from the compensating rope to the detection unit and output the detected load detection value as the detection result, and the determination unit is configured to determine the overwinding state when the load detection value is greater than a determination value. The elevator device according to Supplementary Note 3. (Supplementary Note 5) The detection unit is the elevator device according to any one of Supplementary Notes 2 to 4, wherein the outer shape of a cross section perpendicular to the longitudinal direction is circular. (Supplementary Note 6) The detection unit is the elevator device according to any one of Supplementary Notes 2 to 5, and is configured to be rotatable about a central axis in the longitudinal direction. (Supplementary Note 7) The elevator apparatus according to any one of Appendices 2 to 6, comprising a pair of anti-sway portions arranged horizontally, straddling the inside of the suspended compensating rope above the position of the detection portion. (Appendix 8) The pair of anti-sway portions are configured to be movable upward. The elevator apparatus according to Appendix 7. (Appendix 9) The base portion a first member fixed to a fixture in the hoistway; a second member attached to the first member so as to hold the relative position with respect to the first member by frictional force when no external force is applied and slide downward when receiving a load equal to or greater than a specified value downward; a third member protruding from the second member so as to overlap at least the lowermost portion of the compensating rope in a vertical projection plane below the lowermost portion of the compensating rope; The detection portion is fixed to the second member. The elevator apparatus according to any one of Appendices 2 to 8, configured as such. (Appendix 10) Comprising a limit detection device for detecting that the lowermost portion of the compensating rope has reached a limit position below the detection portion; When the limit detection device detects that the lowermost portion has reached the limit position, the control device stops the hoisting machine. The elevator apparatus according to any one of Appendices 2 to 9, configured as such. (Appendix 11) Comprising an abnormality detection device for detecting an abnormality in which the compensating rope has fallen off from the car or the counterweight; When the abnormality detection device detects the abnormality, the control device stops the hoisting machine. The elevator apparatus according to any one of Appendices 1 to 10, configured as such.

Explanation of Signs

[0078] 2 carriages, 3 hoistways, 4 counterweights, 5 buffers, 6 main ropes, 8 hoisting machines, 10 control devices, 12 compensating ropes, 14 guide rails, 20 detection devices, 22 bases, 24 detection parts, 26 movement detection parts, 30 detection devices, 32 bases, 34 detection parts, 36 load detection parts, 36a, 36b, 36c, 36d load detection parts, 40 anti-sway parts, 50 limit detection devices, 60a, 60b abnormality detection devices, 80 processors, 82 memories, 84 processing circuits, 86 dedicated hardware, 88 processing circuits, 102 signal receiving parts, 104 determination parts, 106 drive control parts, 221 first members, 222 second members, 223 third members, 241 first detection parts, 242 second detection parts, 243 fixed shafts, 244 rotating bodies

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 having both ends 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 for detecting that the vertical position of the lowermost part of the compensating rope has reached a position higher by a determination height than the normal position; a control device for stopping the car when an overwinding state of the main rope is determined based on the detection result of the detection device; comprising; the detection device is a base fixed to a fixture in the hoistway; a detection part disposed so as to straddle the compensating rope from above the lowermost part of the compensating rope at the position of the determination height and movable upward with respect to the base; a movement detection part for detecting that the detection part has moved upward; comprising; the control device is a determination part for determining the overwinding state based on the detection result of the movement detection part; a drive control part for stopping the hoist when the overwinding state is determined in the determination part; comprising; the base is a first member fixed to a fixture in the hoistway; a second member attached to the first member so as to maintain a relative position with respect to the first member by frictional force when no external force is applied and slide downward when receiving a load equal to or greater than a specified value downward; a third member protruding from the second member so as to overlap at least the lowermost part of the compensating rope in a vertical projection plane below the lowermost part of the compensating rope; the detection part is fixed to the second member an elevator device configured as such.

2. 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 having both ends 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 for detecting that the vertical position of the lowermost part of the compensating rope has reached a position higher by a determination height than the normal position; a control device for stopping the car when an overwinding state of the main rope is determined based on the detection result of the detection device; comprises, the detection device is, a base fixed to a fixture in the hoistway, a detection unit fixed to the base so as to straddle the compensating rope from above the lowermost part of the compensating rope at the position of the determination height, a load detection unit that detects that an upward load has been applied to the detection unit from the compensating rope, comprises, the control device is, 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 hoisting machine when the overwinding state is determined by the determination unit, comprises, the base is, a first member fixed to a fixture in the hoistway, a second member attached to the first member so as to hold the relative position with respect to the first member by frictional force when no external force is applied and slide downward when receiving a load equal to or greater than a specified value downward, a third member protruding from the second member so as to overlap at least the lowermost part of the compensating rope in a vertical projection plane below the lowermost part of the compensating rope, the detection unit is fixed to the second member an elevator device configured as such.

3. The load detection unit is configured to detect an upward load applied from the compensating rope to the detection unit and output the detected load detection 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 The elevator device according to claim 2, configured as such.

4. The detection unit has an outer shape with a circular cross-section perpendicular to the longitudinal direction. The elevator device according to claim 1 or claim 2.

5. The detection unit is configured to be rotatable around the central axis in the longitudinal direction. The elevator device according to claim 1 or claim 2.

6. Above the position of the detection unit, a pair of anti-sway portions arranged side by side horizontally, straddling the inside of the suspended compensating rope. The elevator device according to claim 1 or claim 2.

7. The pair of anti-sway portions are configured to be movable upward The elevator device according to claim 6.

8. A limit detection device that detects that the lowermost part of the compensating rope has reached a limit position below the detection unit is provided, The control device stops the hoisting machine when the limit detection device detects the arrival of the lowermost part at the limit position. The elevator apparatus according to claim 1 or claim 2, configured as such.

9. An abnormality detection device for detecting an occurrence of an abnormality in which the compensating rope has fallen off from the car or the counterweight, wherein the control device stops the hoisting machine when the abnormality detection device detects the abnormality. The elevator apparatus according to claim 1 or claim 2, configured as such.

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