WO2013094612A1

WO2013094612A1 - Elevator device and control method therefor

Info

Publication number: WO2013094612A1
Application number: PCT/JP2012/082814
Authority: WO
Inventors: 政之垣尾; 琢夫釘谷
Original assignee: 三菱電機株式会社
Priority date: 2011-12-21
Filing date: 2012-12-18
Publication date: 2013-06-27
Also published as: JP5646061B2; DE112012005403T5; CN103517863B; JPWO2013094612A1; CN103517863A

Abstract

An elevator device wherein a suspension body abnormality detection device detects breakage or stretching of a suspension body from which a cage is suspended as an abnormality of the suspension body. Further, the suspension body abnormality detection device performs detection by distinguishing whether the degree of abnormality of the suspension body is of a first level or of a second level which is higher than the first level. When a first level abnormality of the suspension body has occurred, the elevator control device moves the cage to any of the floors at which the elevator stops, and then moves the cage to a position separated by more than a prescribed distance from the structure below.

Description

Elevator apparatus and control method thereof

The present invention relates to an elevator apparatus in which a car is suspended by a plurality of suspension bodies and a control method therefor.

In the conventional elevator apparatus, when a break of at least one main rope is detected, an operation signal is output from the output unit to the hoisting machine brake, and the car is decelerated and stopped by the hoisting machine brake. Moreover, when the breakage of all the main ropes is detected, an operation signal is output from the output unit to the emergency stop device, and the car is emergency stopped by the emergency stop device (see, for example, Patent Documents 1 and 2).

Japanese Patent No. 4292203 Japanese Patent No. 4641305

In the conventional elevator apparatus as described above, when the breakage of the main rope is detected, the car is immediately stopped by the hoisting machine brake or the emergency stop device, so that the passenger is trapped in the car and the serviceability is deteriorated. Invite. In addition, when the car collides with the car shock absorber, it takes time to return due to the scattering of oil or the like, and this also causes deterioration in serviceability.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an elevator apparatus and a control method therefor that can suppress a decrease in serviceability when a suspension body breaks or extends. To do.

An elevator apparatus according to the present invention includes a hoisting machine having a driving sheave, a plurality of suspension bodies wound around the driving sheave, a car that is suspended in a hoistway by the suspension body, and is raised and lowered by the hoisting machine, An elevator control device that controls the operation of the car, and a suspension abnormality detection device that detects breakage or elongation of the suspension as an abnormality of the suspension. The suspension abnormality detection device has a first degree of abnormality of the suspension. Level, or a second level higher than the first level, and the elevator control device detects the car when any of the first level abnormalities occurs in the suspension. After moving to the stop floor, it is moved to a position more than a predetermined distance away from the structure below.
In addition, the elevator apparatus control method according to the present invention may be configured such that when a suspension abnormality is detected by the suspension abnormality detection device, if the degree of abnormality of the suspension is equal to or lower than a preset level, After moving to such a stop floor, it is moved to a position more than a predetermined distance away from the structure below.
Furthermore, the elevator apparatus according to the present invention is a hoisting machine having a driving sheave, a plurality of suspension bodies wound around the driving sheave, suspended in a hoistway by the suspension body, and lifted and lowered by the hoisting machine. A car, an elevator control device for controlling the operation of the car, and a suspension body abnormality detection device for detecting breakage or elongation of the suspension body as an abnormality of the suspension body. The suspension body abnormality detection device has a first degree of abnormality of the suspension body. Distinguishing whether it is a level of 1 or a second level higher than the first level, the elevator control device detects the car when the abnormality of the first level occurs in the suspension, Move to a position more than a predetermined distance away from the structure below.

The elevator apparatus and the control method thereof according to the present invention can prevent the car from colliding with a structure underneath when the suspension body is broken or stretched, and can suppress deterioration in serviceability.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows the elevator apparatus by Embodiment 1 of this invention. It is a block diagram which shows the starting rope holding | grip apparatus of FIG. It is a block diagram which shows the cage | basket-side rope stop part and break detection apparatus of FIG. It is a flowchart which shows operation | movement of the elevator control apparatus of FIG. It is a schematic block diagram which shows the principal part of the elevator apparatus of the one shaft multicar system by Embodiment 2 of this invention. It is a flowchart which shows operation | movement of the 1st elevator control apparatus of FIG. It is a flowchart which shows operation | movement of the 2nd elevator control apparatus of FIG. It is a block diagram which shows the modification of the fracture | rupture detection apparatus of FIG.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
1 is a block diagram showing an elevator apparatus according to Embodiment 1 of the present invention. In the figure, a machine room 2 is provided in the upper part of the hoistway 1. In the machine room 2, a hoisting machine 3 is installed. The hoisting machine 3 includes a driving sheave 3a, a hoisting machine motor (not shown) that rotates the driving sheave 3a, and a hoisting machine brake 3b that brakes the rotation of the driving sheave 3a.

A plurality of suspension bodies 4 (only one is shown in FIG. 1) are wound around the drive sheave 3a. As each suspension body 4, a rope or a belt is used.

The car 5 and the counterweight 6 are suspended in the hoistway 1 by the suspension body 4, and are raised and lowered in the hoistway 1 by the hoisting machine 3. In the hoistway 1, a pair of car guide rails (not shown) for guiding the raising and lowering of the car 5 and a pair of counterweight guide rails (not shown) for guiding the raising and lowering of the counterweight 6 are installed. Has been.

In the machine room 2, an elevator control device 7 and a safety monitoring device (electronic safety device) 8 are installed. The elevator control device 7 controls the operation of the car 5. The safety monitoring device 8 monitors the state of the elevator device (whether there is an abnormality). The elevator control device 7 and the safety monitoring device 8 each have an independent computer. Thereby, the safety monitoring device 8 monitors the state of the elevator device independently of the elevator control device 7.

In the machine room 2, a governor 9 is installed. The governor 9 has a governor sheave. A loop-shaped emergency stop starting rope (governor rope) 11 is wound around the governor sheave. A tension wheel 10 is provided at the lower part of the hoistway 1. The lower end portion of the emergency stop starting rope 11 is wound around the tension wheel 10.

Further, the emergency stop starting rope 11 is connected to the car 5 and is circulated and moved as the car 5 moves up and down. Thereby, the governor sheave is rotated at a speed corresponding to the traveling speed of the car 5. A governor encoder 12 that is a rotation detector for detecting the rotation amount of the governor sheave is disposed on the same axis as the governor sheave.

An upper hoistway switch 13 for detecting the passage of the car 5 is installed near the upper terminal floor in the hoistway 1. A lower hoistway switch 14 for detecting the passage of the car 5 is installed near the lower terminal floor in the hoistway 1. A switch operating member (rail) 15 for operating the

hoistway switches

13 and 14 is attached to the car 5.

A car destination registration device 16 is provided in the car 5. A hall call registration device 17 is provided in each of the halls on the plurality of stop floors. Signals from the car destination registration device 16 and the hall call registration device 17 are input to the elevator control device 7.

Signals from the governor encoder 12 and the

hoistway switches

13 and 14 are input to the safety monitoring device 8. The safety monitoring device 8 monitors whether the car 5 is traveling at an overspeed. When overspeed traveling is detected, the safety monitoring device 8 outputs a command signal for operating the hoisting machine brake 3b.

The overspeed monitoring standard (threshold value) V1 is set in the safety monitoring device 8. The overspeed monitoring reference V1 is a curve that changes according to the position of the car 5, and is set so as to be continuously lowered toward the terminal end in the vicinity of the lowermost floor and the uppermost floor, that is, in the vicinity of the terminal floor of the hoistway. Has been. Thereby, the overspeed in the vicinity of the end portion can be detected at an early stage, and the safety space in consideration of the collision of the car 5 with the end portion can be reduced.

The safety monitoring device 8 needs to detect the position of the car 5 in order to set the overspeed monitoring reference V1 that changes according to the position of the car 5. Therefore, the safety monitoring device 8 detects the movement distance of the car 5 by the governor encoder 12 after detecting the passage of the car 5 by the signal from the upper hoistway switch 13 or the lower hoistway switch 14. Then, the position of the car 5 is detected.

In addition, the safety monitoring device 8 detects the speed of the car 5 by performing arithmetic processing using the output signal from the governor encoder 12. Then, the safety monitoring device 8 compares the detected speed of the car 5 with the overspeed monitoring reference V1, and determines that it is overspeed running when the detected speed of the car 5 becomes higher than the overspeed monitoring reference V1. Then, a command signal for operating the hoisting machine brake 3b is output.

A car shock absorber 18 is installed just below the car 5 at the bottom of the hoistway 1. A counterweight buffer 19 is installed just below the counterweight 6 at the bottom of the hoistway 1.

The car 5 is equipped with an emergency stop device 20 that engages with the car guide rail to stop the car 5 in an emergency. The emergency stop activation rope 11 is connected to an operating lever of the emergency stop device 20. When the car 5 is descending, the movement of the emergency stop starting rope 11 is stopped, whereby the operating lever is pulled up, and the emergency stop device 20 is braked.

The machine room 2 is provided with a starting rope gripping device 21 as an emergency stop operating device. The start rope gripping device 21 grips the emergency stop start rope 11 in response to an operation signal from the elevator control device 7. At this time, the activation rope gripping device 21 prevents the movement of the emergency stop activation rope 11 in the direction in which the car 5 is lowered, and allows the movement of the emergency stop activation rope 11 in the direction in which the car 5 is raised.

In the lower part of the car 5, first and second

car suspension wheels

22a and 22b are provided. On the upper portion of the counterweight 6, a counterweight suspension wheel 23 is provided. At the upper part of the hoistway 1, a car-side rope stop 24 and a counterweight-side rope stop 25 are provided. The suspension body 4 has a first end connected to the car-side rope stopper 24 and a second end connected to the counterweight-side rope stopper 25.

The suspension body 4 is wound around the first car suspension wheel 22a, the second car suspension wheel 22b, the drive sheave 3a, and the counterweight suspension wheel 23 in order from the first end side. That is, the car 5 and the counterweight 6 are suspended by the suspension body 4 in a 2: 1 roping manner.

The car-side rope stopper 24 is provided with a breakage detection device 26 as a suspension abnormality detection device that detects a breakage of the suspension 4 as an abnormality of the suspension 4. A detection signal from the breakage detection device 26 is input to the elevator control device 7.

FIG. 2 is a block diagram showing the activation rope gripping device 21 of FIG. The portion of the emergency stop activating rope 11 shown in FIG. 2 moves upward when the car 5 rises, and moves downward when the car 5 descends. The first and

second grip portions

31 and 32 that grip (hold) the emergency stop activation rope 11 face each other with the emergency stop activation rope 11 in between. A plurality of gripping force adjustment springs 34 are interposed between the first gripping portion 31 and the fixed portion 33.

The second grip 32 has a base 35, a wedge 36, and a wedge detachment stop 37. The base 35 is provided with an inclined surface 35a that approaches the emergency stop activation rope 11 downward. The wedge 36 is slidable within a predetermined range along the inclined surface 35a. The upward displacement of the wedge 36 is regulated by a wedge detachment stop 37.

A gripping force applying device (actuator) 38 that is actuated in response to the actuation signal and moves the second gripping part 32 in the direction of moving toward and away from the emergency stop activation rope 11 is connected to the base 35. The wedge 36 is brought into contact with the emergency stop activation rope 11 by advancing the second grip 32 by the gripping force adding device 38.

At this time, if the car 5 is lowered, the wedge 36 is displaced obliquely downward along the inclined surface 34a. As a result, the emergency stop activation rope 11 is gripped between the first grip portion 31 and the wedge 36, and the movement of the emergency stop activation rope 11 is restricted. Further, when the car 5 is raised, the wedge 36 is not displaced from the position in contact with the wedge detachment stop 37 toward the first grip portion 31, and the movement of the emergency stop starting rope 11 is allowed.

FIG. 3 is a block diagram showing the car-side rope stop 24 and the breakage detecting device 26 of FIG. Three

rails

41 a, 41 b, 41 c are erected vertically at the upper part of the hoistway 1. A support plate 42 is fixed horizontally to the

rails

41a, 41b, 41c. The first to fourth shackle rods 43a to 43d pass through the support plate. The first end of the corresponding suspension 4 is connected to the lower end of each shackle rod 43a-43d.

Further, a spring pressing member 44 is fixed to each shackle rod 43a to 43d. A shackle spring 45 is provided between each spring pressing member 44 and the support plate 42. Each shackle spring 45 is compressed by a load acting on the corresponding shackle rod 43a to 43d.

The first movable plate 46a is engaged with the

rails

41a and 41b. The second movable plate 46b is engaged with the

rails

41b and 41c. The first and second

movable plates

46 a and 46 b are normally held at predetermined positions above the spring pressing member 44. Further, when the suspension body 4 is broken and the shackle spring 45 is extended, the first and second

movable plates

46a and 46b are pushed up by the spring pressing member 44 and displaced upward.

In the vicinity of the first movable plate 46a, a first detection switch 47a that is operated and opened by an upward displacement of the first movable plate 46a is disposed. The first detection switch 47a detects the breakage of the suspension body 4 connected to the first and

second shackle rods

43a and 43b.

Near the second movable plate 46b, a second detection switch 47b that is operated and opened by an upward displacement of the second movable plate 46b is disposed. The second detection switch 47b detects the breakage of the suspension body 4 connected to the third and

fourth shackle rods

43c and 43d.

The break detection device 26 includes first and second

movable plates

46a and 46b, and first and

second detection switches

47a and 47b. Further, the break detection device 26 distinguishes and detects whether the degree of abnormality of the suspension body 4, that is, the degree of the number of breaks, is the first level or the second level higher than the first level.

In this example, the first level is set when only one of the first and

second detection switches

47a and 47b is operated, and the second level is set when both are operated. Accordingly, when only one of the four suspension bodies 4 is broken, it is the first level, and when three or more suspension bodies 4 are broken, it is the second level. Moreover, when the two suspension bodies 4 are broken, there are cases where the first level is detected and the second level is detected depending on the position of the broken suspension body 4.

The detection signals of the first and second detection switches 47 a and 47 b are input to the elevator control device 7. The elevator control device 7 moves the car 5 to one of the stop floors when the first level of breakage occurs. In other words, when the break detecting device 26 detects breakage of the suspension body 4, the elevator control device 7 sets the car 5 to any one if the degree of the number of breaks of the suspension body 4 is not more than a preset level. Move to the stop floor. In this example, the elevator control device 7 moves the car 5 to the nearest floor when the first level of breakage occurs. The nearest floor is the nearest stopable floor in the traveling direction of the car 5.

Further, when the first level of breakage occurs, the elevator control device 7 moves the car 5 to the nearest floor, and then moves the car 5 to a lower structure (a structure located directly below the car 5). It is moved to a position away from the car shock absorber 18 by a predetermined distance or more. In this example, the predetermined distance is the shortest distance at which the car 5 does not collide with the car shock absorber 18 when all the suspension bodies 4 are broken and the safety device 20 is activated.

Here, the predetermined distance can be determined as follows using, for example, a law. That is, in the Building Standard Law, the emergency stop device 20 starts operating when the speed of the car 5 becomes 1.4 times the rated speed. At this time, it is required to decelerate at a deceleration of 0.2 G or more. The predetermined distance can be determined by giving these conditions in advance or continuously.

Furthermore, if the car 5 is raised when the first level breakage occurs, an operation signal is output to the starting rope gripping device 21.

FIG. 4 is a flowchart showing the operation of the elevator control device 7 of FIG. The elevator control device 7 determines whether or not the first or

second detection switch

47a, 47b is opened when the car 5 is operating normally (step S1) (step S2). If both the first and

second detection switches

47a and 47b are closed, it is determined that the suspension 4 has not been broken, and normal operation is continued.

When the first or

second detection switch

47a, 47b is opened, it is determined that a first level break has occurred, and it is determined whether the car 5 is rising (step S3). If the car 5 is moving up, the starting rope gripping device 21 is operated (step S4), and then the process proceeds to the next step. If the car 5 is not moving up, the process proceeds to the next step.

Next, the elevator control device 7 moves the car 5 to the nearest floor, opens the car door and the landing door, and makes a service stop notification (step S5). In the service stop notification, the passenger is informed that the operation of the elevator apparatus is to be stopped by a warning sound, a guidance broadcast, a message display, etc., and the passenger gets out of the car 5.

Thereafter, the elevator control device 7 determines whether or not the car 5 is at a position separated from the car shock absorber 18 by a predetermined distance or more (step S6), and if it is not separated, the elevator 5 does not collide with the car shock absorber 18. (Step S7). Finally, an emergency stop command is output, and the stopped state of the car 5 is more reliably maintained (step S8).

Here, the safety factor of the suspension 4 is set sufficiently high, and the performance of the suspension 4 is maintained by maintenance. For this reason, even if one of the suspension bodies 4 breaks, the load can be supported by the remaining suspension bodies 4, and the second suspension body 4 breaks after the first suspension body 4 breaks. It seems that there is a certain amount of time until. Using this time, the car 5 can be moved to the nearest floor or moved to a height that does not collide with the car shock absorber 18.

If both the first and

second detection switches

47a and 47b are opened, it is determined that all the suspension bodies 4 may be broken (second level), and the activation rope gripping device 21 is immediately Operate.

In such an elevator apparatus, even if the suspension body 4 breaks, if the degree of breakage is the first level, the car 5 is moved to the nearest floor, so that the occurrence of confinement can be suppressed as much as possible. The decline in sex can be suppressed.

Further, since the car 5 is moved to the nearest floor and then moved to a height at which it does not collide with the car shock absorber 18, even if all the suspension bodies 4 are broken and the car 5 is dropped, the car shock absorber 18 is moved. Collisions are avoided. This prevents damage in the pit (such as oil splattering) due to the collision of the car 5 with the car shock absorber 18, eliminates the trouble of returning, and further suppresses the deterioration of serviceability.

Furthermore, since the starting rope gripping device 21 is operated when the car 5 is moving up, the car 5 can be stopped immediately even if all the suspension bodies 4 break during the movement to the nearest floor. it can.

Embodiment 2. FIG.
Next, FIG. 5 is a schematic configuration diagram showing a main part of a one-shaft multi-car type elevator apparatus according to Embodiment 2 of the present invention. In this example, the first and

second cars

5A and 5B are used as the cars. Accordingly, the hoisting machine 3, the suspension body 4, the counterweight 6, the elevator control device 7, the speed governor 9, the tensioning vehicle 10, the emergency stop starting rope 11, the speed governor encoder 12, and the switch according to the first embodiment. Operation member 15, car destination registration device 16, counterweight buffer 19, emergency stop device 20, starting rope gripping device 21,

car suspension wheels

22a and 22b, counterweight suspension vehicle 23, car side rope stop 24, Two sets of the counterweight side rope stopper 25, the breakage detection device 26, and the like are provided. In FIG. 5, “A” is added to the code of the equipment related to the first car 5 </ b> A, and “B” is added to the code of the equipment related to the second car 5 </ b> B.

The second car (lower car) 5B is arranged directly below the first car (upper car) 5A. That is, when viewed from the first car 5A, the second car 5B is a lower structure (a structure located directly below the first car 5A). The first and

second cars

5A and 5B are raised and lowered independently of each other in the common hoistway 1. The first car 5A is suspended in the hoistway 1 by a plurality of first suspension bodies 4A. The second car 5B is suspended in the hoistway 1 by a plurality of second suspension bodies 4B.

The first emergency stop device 20A is mounted on the first car 5A. A first emergency stop starting rope 11A is connected to the first emergency stop device 20A. The first emergency stop starting rope 11A is gripped by the first starting rope gripping device 21A.

The second emergency stop device 20B is mounted on the second car 5B. A second emergency stop activation rope 11B is connected to the second emergency stop device 20B. The second emergency stop starting rope 11B is gripped by the second starting rope gripping device 21B.

The operation of the first car 5A is controlled by the first elevator control device 7A. The operation of the second car 5B is controlled by the second elevator control device 7B. The first and second

elevator control devices

7A and 7B have independent computers. Moreover, the 1st and 2nd elevator control apparatus 7 can transmit / receive each other's information.

The breakage of the first suspension 4A is detected by the first breakage detection device 26A. A detection signal from the first break detection device 26A is input to the first elevator control device 7A. The breakage of the second suspension body 4B is detected by the second breakage detection device 26B. A detection signal from the second breakage detection device 26B is input to the second elevator control device 7B.

The first elevator control device 7A moves the first and

second cars

5A and 5B to one of the stop floors when the first level of breakage occurs in the first suspension 4A. At least one of the first and

second cars

5A and 5B is moved so that the distance between the first and

second cars

5A and 5B is equal to or greater than a predetermined distance. In this example, the predetermined interval is the shortest time at which the collision of the first and

second cars

5A and 5B does not occur when all the first suspension bodies 4A are broken and the first emergency stop device 20A is activated. Distance. Other configurations and control methods are the same as those in the first embodiment.

Next, FIG. 6 is a flowchart showing the operation of the first elevator control device 7A of FIG. Whether the first or

second detection switch

47a, 47b of the first breakage detection device 26A is opened when the first elevator control device 7A is normally operating the first car 5A (step S11). Is determined (step S12). If both the first and

second detection switches

47a and 47b are closed, it is determined that the first suspension 4A is not broken, and normal operation is continued.

When the first or

second detection switch

47a, 47b is opened, it is determined that a first level of breakage has occurred in the first suspension 4A, and whether or not the first car 5A is rising. Determination is made (step S13). If the first car 5A is rising, after the first activation rope gripping device 21A is operated (step S14), the process proceeds to the next step. If the first car 5A is not rising, it remains as it is. Move on to the next step.

Next, the first elevator control device 7A moves the first car 5A to the nearest floor, opens the car door and the landing door, makes a service stop notification, and passes through the second elevator control device 7B to the second. The car 5B is moved to the nearest floor, the car door and the landing door are opened, and a service stop notification is made (step S15).

Thereafter, the first elevator control device 7A determines whether or not the interval between the first and

second cars

5A and 5B is equal to or greater than a predetermined interval (step S16). And if the space | interval more than a predetermined space is ensured, while outputting the emergency stop command and hold | maintaining the stop state of the 1st car 5A more reliably, also about the 2nd car 5B, it is the 2nd elevator control apparatus. An emergency stop command is output through 7B (step S20).

When the interval between the first and

second cars

5A and 5B is less than the predetermined interval, it is determined whether or not the first car 5A is located on the top floor (step S17). If it is the top floor, the second car 5B is moved downward through the second elevator control device 7B (step S18), and the emergency of the first and

second cars

5A, 5B is ensured after securing a predetermined car interval. A stop command is output (step S20).

When the first car 5A is located on a floor other than the top floor, the first car 5A is moved upward and the second car 5B is moved downward through the second elevator control device 7B (step) S19) After securing a predetermined car interval, an emergency stop command for the first and

second cars

5A, 5B is output (step S20).

Next, FIG. 7 is a flowchart showing the operation of the second elevator control device 7B of FIG. Whether the first or

second detection switch

47a, 47b of the second breakage detection device 26B is opened when the second elevator control device 7B normally operates the second car 5B (step S21). Is determined (step S22). If both the first and

second detection switches

47a and 47b are closed, it is determined that the second suspension 4B is not broken, and normal operation is continued.

When the first or

second detection switch

47a, 47b is opened, it is determined that a first level breakage has occurred in the second suspension body 4B, and whether or not the second car 5B is rising. Determination is made (step S23). If the 2nd cage | basket | car 5B is going up, after operating the 2nd starting rope holding | grip apparatus 21B (step S24), it will transfer to the next step, and if the 2nd cage | basket | car 5B is not going up, it will remain as it is. Move on to the next step.

Next, the second elevator control device 7B moves the second car 5B to the nearest floor, opens the car door and the landing door, makes a service stop notification, and also passes the first elevator control device 7A through the first elevator control device 7A. The car 5A is moved to the nearest floor, the car door and the landing door are opened, and a service stop notification is made (step S25).

Thereafter, the second elevator control device 7B determines whether or not the second car 5B is at a position separated from the car shock absorber 18 by a predetermined distance or more (step S26), and if not, the second car 5B. The first car 5A is moved upward through the first elevator control device 7A, and the second car 5B is moved to a height at which it does not collide with the car shock absorber 18 (step S27). Finally, an emergency stop command is output, and the stopped state of the first and

second cars

5A and 5B is more reliably maintained (step S28).

In such an elevator apparatus, even if the

suspensions

4A and 4B break, if the number of breaks is the first level, the

cars

5A and 5B are moved to the nearest floor, so that the occurrence of confinement is suppressed as much as possible. It is possible to suppress degradation of serviceability.

Further, after the

cars

5A and 5B are moved to the nearest floor, the second car 5B is moved to a height at which it does not collide with the car shock absorber 18, so that all the second suspension bodies 4B are broken and second Even when the car 5B falls, collision with the car shock absorber 18 is avoided. As a result, damage in the pit due to the collision of the second car 5B with the car shock absorber 18 is prevented, and there is no need for return, thereby further reducing deterioration in serviceability.

Further, if the

cars

5A and 5B are rising, the starting

rope gripping devices

21A and 21B are operated, so that even if all the

suspension bodies

4A and 4B break during the movement to the nearest floor, the

cars

5A and 5B 5B can be stopped immediately.

Furthermore, when the first level of breakage occurs in the first suspension 4A, the first and

second cars

5A and 5B are moved to one of the stop floors, respectively, and then the first and second Since at least one of the first and

second cars

5A, 5B is moved so that the distance between the

cars

5A, 5B is equal to or greater than a predetermined distance, the collision between the

cars

5A, 5B can be more reliably prevented. . As a result, early recovery is possible, and deterioration in serviceability can be further suppressed.

In the first and second embodiments, the break detection device is provided in the car-side rope stopper, but it can also be provided in the counterweight-side rope stopper or in both rope stoppers.
In addition, the detection method of the breakage detection device is not limited to the above example, for example, a method using a scale device, a method using a suspension of a suspension provided in a car, a method by image diagnosis, Alternatively, various known detection methods such as a method of detecting the state of the wire of the suspension body can be used.

Further, in the first and second embodiments, the fracture detection device is used as the suspension abnormality detection device. However, the suspension abnormality detection device detects an elongation exceeding a predetermined amount of the suspension as a suspension abnormality. It may be. In this case, the stretch detection device has a second level in which the degree of abnormality of the suspension body, that is, the degree of the number of suspension bodies whose elongation amount has reached or exceeded the threshold is the first level or higher than the first level. It distinguishes and detects. Alternatively, the elongation detection device detects whether the degree of elongation of the most elongated suspension body is the first level or the second level higher than the first level.

Furthermore, in the first and second embodiments, the degree of the number of breaks of the suspension is detected in two stages, but the degree of abnormality of the suspension may be detected in three or more stages. For example, the same number of detection switches as the number of suspensions may be used to accurately detect how many suspensions have broken. It is also possible to appropriately set how many breaks (which level of anomaly) are used to move to the nearest floor.

Further, an elevator control device related to the control of one car may be constituted by a plurality of computers, and monitoring of breakage of the suspension may be executed by a computer different from the car operation control.
Furthermore, the configuration of the activation rope gripping device is not limited to FIG.

Furthermore, as a speed pattern for moving the car to the nearest floor, a pattern different from the speed pattern before the suspension breakage is detected may be used. For example, when the car is moved to the nearest floor, an increase in the number of breaks (aggravation of abnormality) may be suppressed by reducing the speed or reducing the deceleration.
Further, the floor on which the car is moved when the suspension is abnormal is not limited to the nearest floor, and may be, for example, a specific stop floor specified in advance. Further, for example, it may be the closest floor among a plurality of stop floors designated in advance.

Furthermore, an emergency stop device can be attached to the counterweight, thereby avoiding a collision of the counterweight with the counterweight buffer. Moreover, the breakage of the broken suspension body can be prevented. In particular, in a multi-car elevator device, it is possible to prevent other cars from being damaged due to the suspension of the suspension.

Furthermore, in the second embodiment, an elevator apparatus including two cars is shown, but the present invention can also be applied to an elevator apparatus in which three or more cars are lifted and lowered in a common hoistway.
In the first and second embodiments, when the first level of breakage (or elongation) occurs, priority is given to moving the car to the nearest floor, but priority is given to avoiding collision with the structure below. And then move to the nearest floor.

Furthermore, when the first level of fracture (or elongation) occurs, it is not always necessary to carry out all of the above processing. For example, the car may only be moved to the nearest floor, and the occurrence of confinement can be suppressed. Moreover, you may implement only the collision avoidance to a lower structure. For example, after confirming that there are no passengers in the car, it is possible to perform only the collision avoidance operation for the lower structure. Furthermore, it is possible to omit the process of operating the starting rope gripping device while the car is rising, or to omit the process of securing the car interval at a predetermined interval or more.

Furthermore, the layout of the entire elevator apparatus is not limited to the configuration shown in FIG. 1, and the present invention can be applied to, for example, a 1: 1 roping type elevator, machine room-less elevator, and double deck elevator. In addition, for example, an elevator of a type in which a hoisting machine is arranged at the lower part of the hoistway, an elevator using a plurality of hoisting machines for one car, and a plurality of elevators for one car The present invention can also be applied to an elevator using a counterweight.

Further, as the lower structure, the car shock absorber 18 is shown in the first embodiment and the second car 5B is shown in the second embodiment, but the car collides with the lower structure due to breakage of the suspension. It may be another device installed in the hoistway, such as a possible sensor or obstacle.

Here, FIG. 8 is a block diagram showing a modification of the breakage detection apparatus of FIG. A first elongation detection plate 48a is engaged between the support plate 42 of the

rails

41a and 41b and the first movable plate 46a. A second extension detection plate 48b is engaged between the support plate 42 of the

rails

41b and 41c and the second movable plate 46b.

The first and second

extension detection plates

48 a and 48 b are normally held horizontally at a predetermined position above the spring pressing member 44. Further, the first and second

extension detection plates

48a and 48b are pushed up by the spring pressing member 44 and displaced upward when the suspension body 4 is extended by a predetermined amount or more.

In the vicinity of the first stretch detection plate 48a, a first stretch detection switch 49a that is operated and opened by an upward displacement of the first stretch detection plate 48a is disposed. The first extension detection switch 49a detects that an extension of a predetermined amount or more has occurred in the suspension body 4 connected to the first and

second shackle rods

43a and 43b.

Near the second stretch detection plate 48b, a second stretch detection switch 49b that is operated and opened by an upward displacement of the second stretch detection plate 48b is disposed. The second extension detection switch 47b detects that an extension of a predetermined amount or more has occurred in the suspension body 4 connected to the third and

fourth shackle rods

43c and 43d.

The stretch detection device 50 includes first and second

stretch detection plates

48a and 48b, and first and second

stretch detection switches

49a and 49b. When one of the suspensions 4 breaks, the corresponding

extension detection plate

48a or 48b is further displaced upward, the corresponding

movable plate

46a or 46b is displaced upward, and the corresponding

detection switch

47a or 47b is operated. The The distance between the

extension detection plates

48a and 48b and the

movable plates

46a and 46b is defined so that the extension and breakage of the suspension 4 can be distinguished and grasped.

According to such a configuration, the extension and breakage of the suspension body 4 can be detected separately based on the extension amount of the shackle spring 45. Then, the state in which the suspension body 4 is likely to extend and is detected is detected, and the

cars

5, 5A and 5B are controlled as in the first and second embodiments, so that even a single car type elevator apparatus can Even in the case of an elevator apparatus of the type, it is possible to prevent the suspension body 4 from being violated when the suspension body 4 is broken.

In the break detection device 26, the four suspension bodies 4 are divided into two groups of two, and the degree of the number of breaks is the first by the operation of the detection switch 47a and the detection switch 47b corresponding to these groups. Whether it is a level or a second level higher than the first level was distinguished and detected. However, the number of the suspension bodies 4 included in each group is not limited to two, and may be one and three. In addition, since the total number of suspensions varies depending on the elevator apparatus, the suspensions included in each group can be appropriately changed according to the total number of suspensions.

Similarly, also about the elongation detection apparatus 50, the number of groups and the number of the suspension bodies 4 contained in each group can be changed suitably.
In addition, depending on the operating state of the

elongation detection switch

49a or 49b and the

breakage detection switch

47a or 47b, it is detected by distinguishing whether the degree of elongation is the first level or the second level higher than the first level. May be.

Claims

Hoisting machine with drive sheave,
A plurality of suspensions wound around the drive sheave;
A car that is suspended in a hoistway by the suspension and lifted by the hoist,
An elevator control device for controlling the operation of the car, and a suspension abnormality detection device for detecting breakage or elongation of the suspension as an abnormality of the suspension,
The suspension abnormality detection device detects whether the degree of abnormality of the suspension is a first level or a second level higher than the first level,
When the first level abnormality occurs in the suspension body, the elevator control device moves the car to one of the stop floors, and then moves to a position separated from the lower structure by a predetermined distance or more. Elevator device to let you.
2. The elevator apparatus according to claim 1, wherein the lower structure is a car shock absorber disposed immediately below the car at the bottom of the hoistway.
As the car, a first car, a second car that is arranged directly below the first car, and is lifted and lowered in the hoistway independently of the first car, is used.
The lower structure viewed from the first car is the second car,
The elevator control device moves the first and second cars to one of the stop floors when the first level abnormality occurs in the suspension body that suspends the first car. The elevator apparatus according to claim 1 or 2, wherein at least one of the first car and the second car is moved so that an interval between the first car and the second car is equal to or greater than a predetermined distance. .
An emergency stop device mounted on the car, and actuated in response to an operation signal, and the emergency stop device is not operated when the car is raised, and the emergency stop device is activated when the car is lowered. Equipped with an emergency stop actuating device,
The elevator control device outputs an operation signal to the emergency stop actuator if the car is raised when the first level abnormality occurs in the suspension body. The elevator apparatus of any one of these.
A speed governor having a speed governor sheave, and an emergency stop starting rope that is wound around the speed governor sheave and connected to the emergency stop device, and is circulated and moved as the car is raised and lowered. In addition,
The emergency stop actuating device is a starting rope gripping device;
When the activation rope gripping device is operated according to the operation signal, the activation rope gripping device grips the emergency stop activation rope to prevent the movement of the emergency stop activation rope in a direction in which the cage descends, and the cage is raised. 5. The elevator apparatus according to claim 4, wherein the emergency stop starting rope is allowed to move in a direction to travel.
Hoisting machine with drive sheave,
A plurality of suspensions wound around the drive sheave;
A car that is suspended in a hoistway by the suspension and lifted by the hoist,
An elevator control device that controls the operation of the car, and a control method for an elevator device that includes a suspension abnormality detection device that detects breakage or elongation of the suspension as an abnormality of the suspension,
When the suspension abnormality is detected by the suspension abnormality detection device, if the degree of abnormality of the suspension is equal to or lower than a preset level, the car is moved to one of the stop floors. The control method of the elevator apparatus which moves to the position away from the downward structure more than predetermined distance.
Hoisting machine with drive sheave,
A plurality of suspensions wound around the drive sheave;
A car that is suspended in a hoistway by the suspension and lifted by the hoist,
An elevator control device for controlling the operation of the car, and a suspension abnormality detection device for detecting breakage or elongation of the suspension as an abnormality of the suspension,
The suspension abnormality detection device detects whether the degree of abnormality of the suspension is a first level or a second level higher than the first level,
The elevator control device is an elevator device that moves the car to a position separated from a lower structure by a predetermined distance or more when an abnormality of the first level occurs in the suspension body.
When the first level of breakage occurs, the elevator control device moves the car to a position separated from the lower structure by a predetermined distance or more, and then moves the car from the lower structure by a predetermined distance or more. The elevator apparatus according to claim 7, wherein the elevator apparatus is moved to one of the stop floors.