WO2023170873A1

WO2023170873A1 - Elevator system

Info

Publication number: WO2023170873A1
Application number: PCT/JP2022/010630
Authority: WO
Inventors: 篤志柴田
Original assignee: 三菱電機株式会社
Priority date: 2022-03-10
Filing date: 2022-03-10
Publication date: 2023-09-14

Abstract

The present invention provides an elevator system that can detect rope slippage without measuring the amount of rotation of a rotary shaft of a hoisting machine. The elevator system comprises a car, a main rope which suspends the car, a sheave around which the main rope is wound, a brake that brakes the sheave, a governor encoder that outputs a movement signal according to the movement amount of the car, and a detection device that detects an occurrence of rope slippage of the main rope slipping on the surface of the sheave, wherein the detection device comprises: a rotation estimation unit that estimates, on the basis of the operating state of the brake, a stop time at which the sheave stops; and a slippage detection unit that detects the occurrence of rope slippage, in which the main rope slips on the surface of the sheave, on the basis of the stop time estimated by the rotation estimation unit and the movement signal outputted from the governor encoder according to the amount of car movement.

Description

elevator system

The present disclosure relates to an elevator system.

Patent Document 1 discloses an elevator system. In the elevator system, a pulse signal indicating the amount of rotation of the drive shaft of the hoist and a pulse signal indicating the amount of rotation of the governor sheave are output. The computing device of the elevator system can detect rope slippage, which is a phenomenon in which the main rope slips on the surface of the sheave, based on the difference between the amount of rotation of the drive shaft and the amount of rotation of the governor sheave.

Japanese Patent Application Publication No. 2013-023367

However, in the elevator system described in Patent Document 1, it is necessary to measure the amount of rotation of the rotating shaft of the hoist. However, for example, if a device that measures the amount of rotation of the rotating shaft breaks down, rope slippage cannot be detected.

The present disclosure has been made to solve the above problems. An object of the present disclosure is to provide an elevator system that can detect rope slippage without measuring the amount of rotation of a rotating shaft of a hoist.

The elevator system according to the present disclosure includes a car, a main rope for hanging the car, a sheave around which the main rope is wound, a brake for braking the sheave, and outputs a movement signal according to the amount of movement of the car. An elevator system comprising: a governor encoder that detects the occurrence of rope slippage in which the main rope slides on the surface of the sheave; a rotation estimation unit that estimates a stop time at which the sheave stopped based on the rotation estimation unit, and a movement signal output from the governor encoder according to the stop time estimated by the rotation estimation unit and the movement amount of the car, The apparatus further includes a slip detection section that detects occurrence of rope slip in which the main rope slides on the surface of the sheave.

According to the present disclosure, the stop time at which the sheave stopped is estimated based on the operating state of the brake, and the occurrence of rope slippage is detected based on the stop time and the movement signal. Therefore, rope slippage can be detected without measuring the amount of rotation of the rotating shaft of the hoist.

1 is a diagram showing an outline of a building provided with an elevator system in Embodiment 1. FIG. 1 is a diagram schematically showing an electromagnetic brake device of an elevator system in Embodiment 1. FIG. FIG. 3 is a diagram showing part of state information created by the detection device of the elevator system in Embodiment 1. FIG. It is a figure which shows a part of state information and the result estimated by the rotation estimator in Embodiment 1 which the detection apparatus of the elevator system produces. FIG. 3 is a diagram showing information detected by a slip detector of the elevator system in Embodiment 1. FIG. 3 is a flowchart for explaining an overview of the operation of the detection device of the elevator system in Embodiment 1. FIG. 1 is a hardware configuration diagram of a detection device of an elevator system in Embodiment 1. FIG. FIG. 2 is a diagram showing an outline of a building provided with an elevator system according to a second embodiment. FIG. 7 is a diagram showing an outline of an electromagnetic brake device of an elevator system in Embodiment 2. FIG. FIG. 7 is a diagram showing information detected by a rotation estimator of the elevator system in Embodiment 2. FIG.

Embodiments for carrying out the present disclosure will be described with reference to the accompanying drawings. In each figure, the same or corresponding parts are given the same reference numerals. Duplicate explanations of the relevant parts will be simplified or omitted as appropriate.

Embodiment 1.
FIG. 1 is a diagram showing an outline of a building in which an elevator system according to the first embodiment is installed.

As shown in FIG. 1, the elevator system 1 is installed in a building (not shown). The hoistway 2 passes through each floor of the building. A machine room (not shown) is provided directly above the hoistway 2. The hoist 3 is provided in the machine room. The shaft body 4 is provided on the hoisting machine 3. The sheave 5 is connected to the shaft body 4 so as to be coaxial with the shaft body 4. The main rope 6 is wound around the sheave 5.

The brake device 7 can brake the rotation of the sheave 5. For example, the brake device 7 is a drum type brake. The brake device 7 includes a brake target 8, an electromagnetic brake device 9, and a brake controller 10.

When the brake device 7 is a drum-type brake, the braked body 8 is a brake drum. The braked body 8 is connected to the shaft body 4 so as to be coaxial with the shaft body 4 . The braked body 8 can rotate in synchronization with the sheave 5. The electromagnetic brake device 9 is provided adjacent to the braked body 8 . The electromagnetic brake device 9 can brake the rotational motion of the braked body 8 . Brake controller 10 is electrically connected to electromagnetic brake device 9 . Brake controller 10 controls electromagnetic brake device 9 .

The car 11 is suspended on one end of the main rope 6 inside the hoistway 2. The counterweight 12 is suspended on the other end side of the main rope 6 inside the hoistway 2 .

The governor 13 is provided from the hoistway 2 to the machine room. The governor 13 includes a governor sheave 14, a governor rope 15, and a governor encoder 16.

The governor sheave 14 is rotatably provided in the machine room. The governor rope 15 is formed into an endless shape. The governor rope 15 is wound around the governor sheave 14 so that it can move in synchronization with the rotation of the governor sheave 14. A portion of the governor rope 15 is attached to the car 11. Governor encoder 16 is provided on governor sheave 14 . The governor encoder 16 outputs a movement signal according to the amount of rotation of the governor sheave 14.

The elevator control device 17 is provided in the machine room. The elevator control device 17 is electrically connected to the hoisting machine 3, the brake controller 10, and the governor encoder 16. Elevator control device 17 may control elevator system 1 as a whole.

The elevator system 1 further includes a detection device 20. The detection device 20 is provided in the machine room. The detection device 20 is electrically connected to the brake device 7, the governor encoder 16, and the elevator control device 17. The detection device 20 detects the occurrence of rope slippage, which is a phenomenon in which the main rope 6 slips on the surface of the sheave 5. The detection device 20 includes a brake state acquirer 21, a rotation estimator 22, and a slip detector 23.

The brake state acquisition device 21 is provided in the electromagnetic brake device 9 as a brake state acquisition section. The brake state acquisition device 21 acquires state information indicating the operating state of the brake device 7 from the electromagnetic brake device 9 .

The rotation estimator 22, as a rotation estimator, estimates the state of the sheave 5 based on the state information acquired by the brake state acquirer 21. Specifically, the rotation estimator 22 estimates whether or not the rotation of the sheave 5 has stopped.

As a slip detection section, the slip detector 23 can detect the occurrence of rope slip based on the result estimated by the rotation estimator 22 and the movement signal from the governor encoder 16. At this time, the slip detector 23 calculates the current speed of the car 11 based on the movement signal. When the slip detector 23 detects that rope slip has occurred, it transmits information indicating that rope slip has occurred to the brake controller 10 and the elevator control device 17.

When the elevator system 1 normally operates, the elevator control device 17 controls the hoisting machine 3 based on information such as the current flowing through the hoisting machine 3. The hoist 3 rotates a shaft body 4. The sheave 5 and the braked body 8 rotate in synchronization with the shaft body 4. The main rope 6 moves following the rotational movement of the sheave 5 due to the frictional force generated between the sheave 5 and the main rope 6. The car 11 and the counterweight 12 follow the movement of the main rope 6 and move up and down in opposite directions. The governor rope 15 moves following the car 11. The governor sheave 14 rotates following the movement of the governor rope 15. Governor encoder 16 outputs a movement signal corresponding to the amount of movement of car 11 to elevator control device 17 . The elevator control device 17 uses information such as signals from the governor encoder 16 to grasp the position of the car 11.

When stopping the car 11, the elevator control device 17 sends a command to the brake controller 10 to brake the sheave 5. When the brake controller 10 receives the command, it transmits a command to the electromagnetic brake device 9 to brake the body 8 to be braked. The electromagnetic brake device 9 applies braking force to the brake target 8 based on a command from the brake controller 10 . The rotational speed of the braked body 8 is reduced by the applied braking force. The rotational speed of the sheave 5 is reduced in synchronization with the braked body 8. That is, the electromagnetic brake device 9 indirectly applies a braking force to the sheave 5 via the braked body 8 and the shaft body 4, thereby braking the rotational movement of the sheave 5. The speed of the main rope 6 and the speed of the car 11 are reduced following the deceleration of the rotational speed of the sheave 5. Thereafter, the braked body 8 and the sheave 5 stop. The main rope 6 and the car 11 stop.

Although not shown, the hoisting machine 3 is provided with a hoisting machine encoder that outputs a signal according to the amount of rotation of the shaft body 4. The elevator control device 17 detects the position of the car 11 based on information such as a signal from the hoist encoder and a movement signal from the governor encoder 16, and operates the car 11. When an abnormality occurs in the hoist encoder and the signal is no longer output, the elevator control device 17 brings the car 11 to an emergency stop. In this case, for example, the elevator control device 17 stops the car 11 in the same manner as in normal operation. At this time, rope slippage in which the main rope 6 slips on the surface of the sheave 5 may occur.

For example, if rope slippage occurs, the main rope 6, car 11, and counterweight 12 may move even after the sheave 5 has stopped. In this case, the detection device 20 detects that rope slippage has occurred. The detection device 20 transmits a signal to the brake device 7 and the elevator control device 17 indicating that rope slippage has occurred. The elevator control device 17 performs an operation to recover from a state in which rope slippage has occurred. Specifically, for example, the elevator control device 17 corrects the currently estimated position of the car 11 based on a position detection device (not shown).

Next, the electromagnetic brake device 9 will be explained using FIG. 2.
FIG. 2 is a diagram showing an outline of the electromagnetic brake device of the elevator system in the first embodiment.

As shown in FIG. 2, the electromagnetic brake device 9 includes a movable body 30, a brake coil 31, a pressing body 32, and a brake power source 33.

For example, the movable body 30 includes a brake shoe and a magnet. The movable body 30 is adjacent to the braked body 8, which is not shown in FIG. The movable body 30 is provided so as to be movable between a contact position where the brake shoe contacts the brake target 8 and a non-contact position where the brake shoe does not contact the brake target 8.

The brake coil 31 is an electromagnetic coil. Although not shown, the brake coil 31 is provided so as to surround a magnet that is a part of the movable body 30 that is located in a non-contact position.

The pressing body 32 is a spring. For example, the pressing body 32 is provided between the movable body 30 and the brake coil 31 in a contracted state. The pressing body 32 applies an urging force to the movable body 30 from the non-contact position to the contact position.

The brake power supply 33 forms a closed circuit with the brake coil 31. The brake power supply 33 supplies power to the brake coil 31. The voltage applied from the brake power source 33 to the brake coil 31 is also referred to as a brake voltage. The current that actually flows through the brake coil 31 is also called a brake current. The brake power supply 33 controls the brake voltage based on a command from the brake controller 10 (not shown in FIG. 2). Specifically, the command from the brake controller 10 includes a voltage command value that commands a brake voltage value. The brake power supply 33 applies a brake voltage that is a voltage command value to the brake coil 31.

The brake controller 10 sends a command to the brake power source 33 to turn the brake voltage ON so that the sheave 5 is in an unbraked state. The brake power supply 33 applies a brake voltage corresponding to the ON voltage to the brake coil 31. The brake coil 31 generates magnetic force using a brake current. The brake coil 31 attracts the magnet of the movable body 30 by the magnetic force. The movable body 30 receives an attractive force from the contact position toward the non-contact position due to the magnetic force. The movable body 30 is held in a non-contact position by the resultant force of the suction force and the urging force from the pressing body 32. This state is a suction state in which the braking force of the brake device 7 does not act on the braked body 8 .

When the sheave 5 is brought into a braked state, the brake controller 10 sends a command to the brake power source 33 to turn the brake voltage to the OFF voltage. The brake power supply 33 does not apply voltage to the brake coil 31 so as to correspond to the OFF voltage. That is, the brake power supply 33 sets the voltage value applied to the brake coil 31 to zero.

In this case, the brake coil 31 does not generate magnetic force that becomes an attractive force. When the movable body 30 is in the non-contact position, it is moved to the contact position by the urging force from the pressing body 32. The brake shoe of the movable body 30 is pressed against the braked body 8 by the urging force from the pressing body 32 at the contact position. At this time, a braking force, which is a frictional force between the braked body 8 and the movable body 30, is generated in the braked body 8. This state is a falling state in which the braking force of the brake device 7 acts on the braked body 8 . That is, the falling state is a state in which the sheave 5 is indirectly braked. When the braked body 8 is rotating, the braked body 8 is decelerated and stopped by the braking force. When the braked body 8 and sheave 5 are in a stopped state in which they are not moving, the braked body 8 and sheave 5 are maintained in their stopped state by the braking force.

The brake state acquisition device 21 is electrically connected to a closed circuit including a brake coil 31 and a brake power source 33. Further, the brake state acquisition device 21 is provided so as to be able to acquire a command input from the brake controller 10 to the brake power supply 33. The brake state acquisition device 21 creates information in which a command from the brake controller 10 to the brake power source 33, a brake voltage value, a brake current value, and a time are associated with each other as state information of the brake device 7. The brake state acquisition device 21 transmits the created state information to the rotation estimator 22.

Next, the operation of the detection device 20 will be explained using FIGS. 3 to 5.
FIG. 3 is a diagram showing part of the status information created by the detection device of the elevator system in the first embodiment. FIG. 4 is a diagram showing part of the state information created by the detection device of the elevator system and the results estimated by the rotation estimator in the first embodiment. FIG. 5 is a diagram showing information detected by the slip detector of the elevator system in the first embodiment. Note that in FIGS. 3 to 5, illustration of each device included in the elevator system 1 is omitted. In FIGS. 3 to 5, information regarding the operation when the brake device 7 brings the car 11 to an emergency stop is shown.

The upper graph in FIG. 3 is a graph representing the relationship between time t and brake voltage command value. In the explanations in FIGS. 3 to 5, the time t is expressed as the elapsed time from the base point time, which is the leftmost time in the upper graph of FIG. The unit of time t is second [s]. Note that the time t may be an absolute time. The unit of the brake voltage command value is volt [V].

The lower graph in FIG. 3 is a graph representing the relationship between time t and brake current value. The unit of the brake current value is ampere [A].

At the base point time, the brake voltage command value is Von. At this time, the brake current value is Aon. The movable body 30 is held in a non-contact position.

At time _t0 , when the brake device 7 brings the car 11 to an emergency stop, the brake controller 10 sends a command to the brake power supply 33 to switch the brake voltage command value to 0, which is the OFF voltage. That is, at time _t0 , which is the command time, the brake voltage command value becomes 0. At time _t0 , the brake voltage value becomes 0. That is, the brake voltage is cut off. Therefore, after time _t0 , the brake current value starts to gradually decrease from Aon.

After time _t0 , the attractive force applied to the movable body 30 decreases as the brake current value decreases. When the suction force is lower than the urging force of the pressing body 32, the movable body 30 moves from the non-contact position to the contact position. At this time, as the magnet of the movable body 30 moves, the magnetic field inside the brake coil 31 changes. An induced current flows through the brake coil 31 due to the generation of a back electromotive force according to the change in the magnetic field. Therefore, at time t _0.5 after time t ₀ , the brake current increases due to the induced current.

After time _t0.5 , the movable body 30 reaches the contact position at time _t1 . The movable body 30 stops at the position where it is pressed against the braked body 8. That is, time _t1 is the time when the brake device 7 starts braking the sheave 5. At this time, since the movable body 30 stops, the magnetic field inside the brake coil 31 does not change. Therefore, at time ₁ , the increase in the brake current due to the induced current stops. After time _t1 , the brake current decreases again.

The rotation estimator 22 estimates the time t ₁ at which the brake device 7 starts braking the sheave 5 based on the time course of the brake current value included in the state information. Specifically, the rotation estimator 22 sets the time t ₁ to be the time after time t _0.5 when the brake current value increases after time t ₀ and when the brake current value starts decreasing. presume. Further, the rotation estimator 22 calculates a time T ₁ from time t ₀ to time t ₁ .

The upper graph in FIG. 4 is a graph representing the relationship between time t and brake voltage command value, similar to the upper graph in FIG. 3. The middle graph in FIG. 4 is a graph showing the relationship between time t and brake current value, similar to the lower graph in FIG.

The lower graph in FIG. 4 is a graph showing the relationship between time t and the sheave rotation estimate indicating the rotation state of the sheave 5 estimated by the rotation estimator 22. For example, the rotation estimator 22 estimates the rotational state of the sheave 5 using two values: a "rotating" state and a "stopped" state. If the "rotation" state is estimated, the sheave rotation estimate is 1. If the state is estimated to be "stopped", the estimated sheave rotation value is 0. For example, at time _t1 , the sheave rotation estimate is 1.

The rotation estimator 22 stores the braking time _T2 in advance. The rotation estimator 22 estimates time t 2 when the braking time T ₂ has elapsed from time t ₁ as the stop time when the sheave 5 stops _. In this case, the rotation estimator 22 transmits information including the stop time _t2 and the estimated sheave rotation value 0 to the slip detector 23 as the estimation result of the state of the sheave 5.

The braking time _T2 is the time expected to be required from when the brake device 7 starts braking the sheave 5 until the sheave 5 stops. For example, the braking time _T2 changes depending on conditions such as the condition of the material of the part where the movable body 30 contacts the braked body 8, the condition of the urging force of the pressing body 32 to press the movable body 30 against the braked body 8, etc. . For example, the braking time _T2 is measured during a test of the elevator system 1 before shipping, and is stored in the detection device 20.

The upper graph in FIG. 5 is a graph representing the relationship between time t and the estimated sheave rotation value, similar to the lower graph in FIG. 4. The lower graph in FIG. 5 shows the car speed of the car 11 calculated by the slip detector 23. For example, the unit of car speed is [m/min].

Since the brake device 7 starts braking the sheave 5 from time _t1 , the car speed decreases from time _t1 . When the slip detector 23 receives estimation result information from the rotation estimator 22, it detects whether rope slip has occurred. The slip detector 23 detects that rope slip has occurred when the car 11 is moving at the stop time _t2 included in the information of the estimation result, that is, when the car speed is not 0.

Note that the slip detector 23 may detect the occurrence of rope slip when it receives a movement signal from the governor encoder 16 after the stop time _t2 without calculating the car speed.

Next, the operation performed by the detection device 20 will be explained using FIG. 6.
FIG. 6 is a flowchart for explaining an overview of the operation of the detection device of the elevator system in the first embodiment.

The detection device 20 performs an operation to monitor rope slippage at an arbitrary timing.

In step S01, the detection device 20 determines whether the brake device 7 has started braking the sheave 5. Specifically, the detection device 20 determines that the brake device 7 has started braking the sheave 5 when detecting a time corresponding to time _t1 .

If it is determined in step S01 that the brake device 7 has not started braking the sheave 5, the operation of step S01 is repeated.

If it is determined in step S01 that the brake device 7 has started braking the sheave 5, the operation in step S02 is performed. In step S02, the detection device 20 waits for a braking time _T2 from time _t1 .

After that, the operation of step S03 is performed. In step S03, the detection device 20 estimates that the sheave 5 has stopped. The detection device 20 creates information indicating the stop result including the stop time _t2 .

After that, the operation of step S04 is performed. In step S04, the detection device 20 determines whether the car 11 is moving at the stop time _t2 .

If it is determined in step S04 that the car 11 is not moving at the stop time _t2 , the detection device 20 determines that rope slippage has not occurred, and ends the operation of the flowchart.

If it is determined in step S05 that the car 11 has moved at stop time _t2 , the operation in step S05 is performed. In step S05, the detection device 20 detects that rope slippage has occurred. The detection device 20 transmits information indicating that rope slippage has occurred to the elevator control device 17 and the like.

After that, the detection device 20 ends the operation of the flowchart.

According to the first embodiment described above, the elevator system 1 includes the detection device 20. The detection device 20 includes a rotation estimator 22 that is a rotation estimation section and a slip detector 23 that is a slip detection section. The detection device 20 estimates the stop time based on the operating state of the brake device 7. The detection device 20 detects the occurrence of rope slippage based on the estimated stop time and the movement signal from the governor encoder 16. Therefore, rope slippage can be detected without measuring the amount of rotation of the shaft body 4. As a result, even if the device that measures the amount of rotation of the shaft body 4 fails, it is possible to detect rope slippage when an emergency stop is performed due to the failure. That is, it is not necessary to take safety measures such as adding a device such as duplicating the device for measuring the amount of rotation of the shaft body 4. The installation cost of these devices and the installation space for these devices can be reduced.

Furthermore, rope slippage can be detected in an elevator system in which a device for measuring the amount of rotation of the shaft body 4 is not provided. Therefore, in such an elevator system, it is possible to perform control to recover from a rope slipping state. Further, the detection device 20 shown in the first embodiment is more effective especially in a low speed range than a method in which the rotational speed of the shaft body 4 calculated based on the current value flowing through the hoisting machine is used to detect rope slippage. High accuracy in detecting rope slippage.

Furthermore, the detection device 20 of the elevator system 1 estimates the time when the prescribed braking time T ₂ has elapsed from the time t ₁ as the stop time t ₂ . The detection device 20 detects that rope slippage has occurred when it is detected that the car 11 is moving at the estimated time based on the movement signal. Therefore, the detection device 20 can estimate the stop time _t2 based on the information representing the operating state of the brake device 7.

Furthermore, the detection device 20 of the elevator system 1 further includes a brake state acquisition device 21 that is a brake state acquisition unit. The detection device 20 creates state information as information representing the operating state of the brake device 7. The detection device 20 estimates time _t1 based on the state information. Therefore, the detection device 20 can estimate time t ₁ and time t ₂ more accurately.

Further, the detection device 20 of the elevator system 1 detects the time after the command time t ₀ when the brake device 7 starts decreasing the brake current value after the brake current value increases at time t _0.5 . It is estimated that it is time _t1 when braking of the sheave 5 is started. Therefore, the detection device 20 can be applied to the existing electromagnetic brake device 9.

Note that the brake device 7 may be a brake device that uses a disc brake system instead of a drum type brake device. In this case, the braked body 8 may be a brake disc. The movable body 30 may be a brake shoe.

Note that the elevator system 1 may be an elevator system that is not provided with a machine room.

Next, an example of hardware constituting the detection device 20 will be described using FIG. 7.
FIG. 7 is a hardware configuration diagram of the detection device of the elevator system in the first embodiment.

Each function of the detection device 20 can be realized by a processing circuit. For example, the processing circuit includes at least one processor 100a and at least one memory 100b. For example, the processing circuitry includes at least one dedicated hardware 200.

When the processing circuit includes at least one processor 100a and at least one memory 100b, each function of the detection device 20 is realized by software, firmware, or a combination of software and firmware. At least one of the software and firmware is written as a program. At least one of software and firmware is stored in at least one memory 100b. At least one processor 100a realizes each function of the detection device 20 by reading and executing a program stored in at least one memory 100b. At least one processor 100a is also referred to as a central processing unit, processing unit, arithmetic unit, microprocessor, microcomputer, or DSP. For example, the at least one memory 100b is a non-volatile or volatile semiconductor memory such as RAM, ROM, flash memory, EPROM, EEPROM, etc., a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, a DVD, etc.

If the processing circuitry comprises at least one dedicated hardware 200, the processing circuitry may be implemented, for example, in a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC, an FPGA, or a combination thereof. Ru. For example, each function of the detection device 20 is realized by a processing circuit. For example, each function of the detection device 20 is collectively realized by a processing circuit.

Regarding each function of the detection device 20, some parts may be realized by dedicated hardware 200, and other parts may be realized by software or firmware. For example, functions provided by the rotation estimator 22 are realized by a processing circuit as dedicated hardware 200, and functions other than those provided by the rotation estimator 22 are realized by at least one processor 100a and stored in at least one memory 100b. It may also be realized by reading and executing a program. The same applies to the functions provided by the brake state acquisition device 21 and the slippage detector 23.

In this way, the processing circuit realizes each function of the detection device 20 using the hardware 200, software, firmware, or a combination thereof.

Embodiment 2.
FIG. 8 is a diagram showing an outline of a building in which an elevator system according to the second embodiment is installed. FIG. 9 is a diagram schematically showing an electromagnetic brake device of an elevator system according to the second embodiment. Note that parts that are the same as or equivalent to those in Embodiment 1 are given the same reference numerals. Description of this part will be omitted.

As shown in FIG. 8, in the second embodiment, the brake device 7 is provided with a brake switch 34. The brake switch 34 outputs a signal corresponding to the operating state of the brake device 7. For example, the elevator control device 17 grasps the operating state of the brake device 7 based on a signal from the brake switch 34.

In the second embodiment, the detection device 20 does not need to include the brake state acquisition device 21. Detection device 20 receives a signal from brake switch 34. The detection device 20 determines the operating state of the brake device 7 based on the signal from the brake switch 34 and detects rope slippage.

As shown in FIG. 9, the brake switch 34 is provided adjacent to the movable body 30. The brake switch 34 is a switch that detects whether the brake device 7 is in a suction state or a falling state.

The brake switch 34 is provided at a position where the switch portion of the brake switch 34 contacts the movable body 30 when the movable body 30 is not in contact with the braked body 8 .

When the movable body 30 is in the contact position, the switch portion of the brake switch 34 does not come into contact with the movable body 30. In this state, the signal of the brake switch 34 is turned OFF. That is, the signal state of the brake switch 34 becomes a signal state in which the brake device 7 is in a falling state, which indicates that the movable body 30 is sufficiently far away from the brake coil 31. Note that the position of the brake switch 34 is adjusted to a position where the brake switch 34 separates from the movable body 30 when the movable body 30 contacts the braked body 8, which is not shown in FIG. Therefore, the time when the signal of the brake switch 34 turns OFF can be regarded as the time when the movable body 30 is pressed against the brake target body 8, and the time when the brake device 7 starts braking the sheave 5. .

Although not shown, when the movable body 30 is in contact with the switch portion of the brake switch 34, the signal of the brake switch 34 is turned ON. That is, the signal state of the brake switch 34 becomes a signal state in which the brake device 7 is in the attracted state, which indicates that the movable body 30 is attracted to the brake coil 31.

Next, the operation of the detection device 20 in the second embodiment will be explained using FIG. 10.
FIG. 10 is a diagram showing information detected by the rotation estimator of the elevator system in the second embodiment. Note that in FIG. 10, illustration of each device included in the elevator system 1 is omitted.

The upper graph in FIG. 10 is a graph representing the relationship between time t and brake voltage command value.

The lower graph in FIG. 10 is a graph representing the relationship between time t and the signal output by the brake switch 34. When the brake device 7 is in the "suction" state, the signal has a value of 1 indicating ON. When the brake device 7 is in the "fall" state, the signal has a value of 0 indicating OFF.

At command time _t0 , the brake voltage command value changes from Von to 0. The movable body 30 starts moving from the non-contact position to the contact position. However, since the movable body 30 is not in contact with the braked body 8, the signal output by the brake switch 34 is 1 indicating the suction state until the falling time _T1 has elapsed.

Thereafter, the movable body 30 comes into contact with the braked body 8. At this point, the signal output by the brake switch 34 goes from 1 to 0.

In the second embodiment, the rotation estimator 22 detects time t ₁ when the brake device 7 starts braking the sheave 5 based on the signal from the brake switch 34 . That is, the rotation estimator 22 sets the time when the signal from the brake switch 34 changes from 1 to 0 as time _t1 .

Thereafter, the rotation estimator 22 estimates time t ₂ based on time t ₁ and time T ₂ as in the first embodiment.

According to the second embodiment described above, the detection device 20 estimates time t ₁ based on the signal from the brake switch 34 . Therefore, the detection device 20 can detect the occurrence of rope slippage without having the brake state acquisition device 21.

Note that, if the detection device 20 can acquire a signal indicating that the brake device 7 has started braking the sheave 5 like the brake switch 34, the elevator system in which the brake device 7 is a brake device other than an electromagnetic brake type is detected. can be applied to.

As described above, the detection device according to the present disclosure can be used in an elevator system.

1 Elevator system, 2 Hoistway, 3 Hoisting machine, 4 Shaft, 5 Sheave, 6 Main rope, 7 Brake device, 8 Braked body, 9 Electromagnetic brake device, 10 Brake controller, 11 Car, 12 Counterweight , 13 Governor, 14 Governor sheave, 15 Governor rope, 16 Governor encoder, 17 Elevator control device, 20 Detection device, 21 Brake status acquisition device, 22 Rotation estimator, 23 Slip detector, 30 Movable body , 31 Brake coil, 32 Pressing body , 33 Brake power supply, 34 Brake switch, 100a Processor, 100b Memory, 200 Hardware

Claims

basket,
a main rope for hanging the basket;
a sheave around which the main rope is wound;
a brake that brakes the sheave;
a governor encoder that outputs a movement signal according to the amount of movement of the car;
a detection device that detects that rope slippage occurs in which the main rope slides on the surface of the sheave;
An elevator system comprising:
The detection device includes:
a rotation estimation unit that estimates a stop time at which the sheave stops based on the operating state of the brake;
Rope slippage in which the main rope slides on the surface of the sheave is occurring based on the stop time estimated by the rotation estimator and a movement signal output from the governor encoder according to the amount of movement of the car. a slip detection section that detects that
Elevator system with.
The rotation estimation unit estimates a time when a prescribed braking time has elapsed from a time when the brake started braking the sheave as the stop time when the sheave stopped;
The slip detection unit detects that the rope slip has occurred when it is detected that the car is moving at the stop time based on the movement signal from the governor encoder. 1. The elevator system according to 1.
a brake state acquisition unit that creates state information including a current value flowing through a brake coil of the brake and a time associated with the current value as information indicating the operating state of the brake;
further comprising;
The elevator system according to claim 2, wherein the rotation estimation section estimates a time when the brake starts braking the sheave based on the state information acquired by the brake state acquisition section.
The brake state acquisition unit creates the state information further including a command time when a command to cut off the voltage applied to the brake coil was sent to the brake;
The rotation estimation unit estimates a time after the command time when the current value included in the status information starts decreasing after increasing as the time when the brake starts braking the sheave. The elevator system according to claim 3.
The elevator system according to claim 2, wherein the rotation estimation unit estimates the time when the brake starts braking the sheave based on a signal indicating the operating state of a brake switch provided on the brake.