JP5164995B2 - Elevator equipment - Google Patents

Description

  The present invention relates to an elevator apparatus that detects a slip of a suspension body with respect to a drive sheave and stops a car.

  In the conventional elevator protection device, slipping of the tow rope with respect to the sheave is detected based on the rotational speed of the pulley that is rotated as the car travels and the command travel speed in the speed command generator. When the set value is exceeded, the sheave is emergency stopped (for example, see Patent Document 1).

  Further, in the conventional elevator safety brake device, when the speed of the car detected by the speed sensor exceeds a threshold value, a start signal is generated by the safety control device. When the activation signal is generated, the friction brake is pressed against the guide rail, and the car is braked (see, for example, Patent Document 2).

JP 59-230981 A JP 2002-532366 A

  In the conventional elevator protective device and safety brake device as described above, rope slip at a low speed cannot be detected, and there is a risk that the rope life will be reduced or the rope will break due to cumulative friction with the sheave. there were.

  The present invention has been made to solve the above-described problems, and can prevent damage to the suspension body caused by excessive sliding of the suspension body with respect to the drive sheave, and can also prevent suspension caused by minute sliding of the suspension body. An object of the present invention is to provide an elevator apparatus that can prevent cumulative body damage.

  The elevator apparatus according to the present invention is mounted on a hoisting machine having a driving sheave, a suspension body wound around the driving sheave, a car suspended by the suspension body, and lifted and lowered by the hoisting machine. An emergency stop device for emergency stopping the car in response, a first speed detector for generating a signal corresponding to the rotational speed of the hoist, a second speed detector for generating a signal corresponding to the traveling speed of the car, and Based on the signals from the first and second speed detectors, a slippage degree value, which is a value related to the degree of slippage of the suspension relative to the drive sheave, is calculated, and when the slippage degree value exceeds the first threshold value, the hoisting machine And a slip monitoring device for stopping the emergency stop device by an operation signal when the car stops at a predetermined floor and the slippage degree value exceeds a second threshold value corresponding to a slippage degree larger than the first threshold value.

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 principal part of the elevator apparatus of FIG. It is a flowchart which shows operation | movement of the slip determination part of FIG. It is a block diagram which shows the principal part of the elevator apparatus by Embodiment 2 of this invention. It is a flowchart which shows operation | movement of the slip determination part of FIG. It is a block diagram which shows the principal part of the elevator apparatus by Embodiment 3 of this invention. It is a flowchart which shows operation | movement of the slip determination part of FIG.

Preferred embodiments of the present invention will be described below 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 hoisting machine 1 is provided at the upper part of the hoistway. The hoist 1 includes an electric motor 2, a drive sheave 3 that is rotated by the electric motor 2, and a hoisting machine brake 4 that brakes the rotation of the drive sheave 3. In this example, the drive sheave 3 is directly connected to the rotating shaft of the electric motor 2 and is rotated integrally with the rotor of the electric motor 2. During normal operation, the hoisting machine brake 4 holds the stopped state when the rotation of the electric motor 2 and the drive sheave 3 is stopped (stationary holding).

  The hoisting machine 1 is provided with a first speed detector 5 that generates a signal corresponding to the rotational speed of the hoisting machine 1, that is, the rotational speed of the drive sheave 3. As the first speed detector 5, for example, an encoder (winding machine encoder) provided on the rotating shaft of the electric motor 2 is used.

  A baffle 6 is provided in the vicinity of the hoist 1. A suspension body 7 is wound around the drive sheave 3 and the deflecting wheel 6. The suspension body 7 includes a plurality of main ropes. As the main rope, for example, a rope having a circular cross section or a belt having a flat cross section can be used.

  A car 8 is connected to the first end of the suspension body 7. A counterweight 9 is connected to the second end of the suspension body 7. That is, the car 8 and the counterweight 9 are suspended in the hoistway by the suspension body 7 and are raised and lowered by the hoisting machine 1. A pair of car guide rails 10 for guiding the raising and lowering of the car 8 and a pair of counterweight guide rails (not shown) for guiding the raising and lowering of the counterweight 9 are installed in the hoistway.

  An emergency stop device 11 that engages with the car guide rail 10 to make the car 8 emergency stop is mounted on the lower part of the car 8. The emergency stop device 11 has an emergency stop drive unit 11a for operating the emergency stop device 11 in accordance with an electrical operation signal. For example, an electromagnetic actuator is used as the emergency stop drive unit 11a.

  A speed governor 12 is provided in the upper part of the hoistway. The governor 12 includes a governor sheave 13 and a rope gripping device 14. A governor rope 15 is wound around the governor sheave 13. Both ends of the governor rope 15 are connected to the emergency stop device 11 via a connecting rod 16. The lower end of the governor rope 15 is wound around a tension wheel 17 provided at the lower part of the hoistway.

  The governor rope 15 is circulated as the car 8 moves up and down. Thereby, the governor sheave 13 is rotated at a speed corresponding to the traveling speed of the car 8. When the traveling speed of the car 8 reaches a preset first overspeed, this is detected by the governor 12 and the car 8 is suddenly stopped by the hoisting machine 1. At this time, energization to the electric motor 2 is cut off, and the hoisting machine brake 4 frictionally brakes the rotation of the electric motor 2 and the drive sheave 3.

  When the traveling speed of the car 8 reaches a preset second overspeed (second overspeed> first overspeed), this is detected by the governor 12 and controlled by the rope gripping device 14. The machine rope 15 is gripped, and the circulation of the governor rope 15 is stopped. As a result, the emergency stop device 11 is mechanically operated via the connecting rod 16, and the car 8 is emergency stopped by the emergency stop device 11.

  The speed governor 12 is provided with a second speed detector 18 that generates a signal corresponding to the rotational speed of the speed governor sheave 13, that is, a signal corresponding to the traveling speed of the car 8. As the second speed detector 18, for example, an encoder (governor encoder) provided on the rotating shaft of the governor sheave 13 is used.

  Signals from the first and second speed detectors 5 and 18 are input to an emergency stop operation command device 19 which is a slip monitoring device. Based on the signals from the first and second speed detectors 5, 18, the emergency stop operation command device 19 calculates a slippage degree value that is a value relating to the slippage degree of the suspension body 7 with respect to the drive sheave 3. In the first embodiment, the emergency stop operation command device 19 calculates the sliding speed of the suspension body 7 with respect to the drive sheave 3 as the slippage degree value.

  Moreover, the emergency stop operation command device 19 stops the car 8 at a predetermined floor by the hoist 1 when the sliding speed of the suspension body 7 exceeds the first speed threshold (first threshold). Furthermore, when the slip speed of the suspension body 7 exceeds a second speed threshold value (second threshold value) that is larger than the first speed threshold value, the emergency stop operation command device 19 sends an operation signal to the emergency stop drive unit 11a. Output.

  FIG. 2 is a block diagram showing a main part of the elevator apparatus of FIG. The emergency stop operation command device 19 includes a slip speed calculation unit 20 and a slip determination unit 21. The sliding speed calculation unit 20 calculates the sliding speed of the suspension body 7 with respect to the drive sheave 3 based on the signals from the first and second speed detectors 5 and 18. Specifically, assuming that the detection speed of the first speed detector 5 is V1, and the detection speed of the second speed detector 18 is V2, the slip speed δV is obtained by δV = | V1-V2 |. .

  The slip determination unit 21 receives the calculation result from the slip speed calculation unit 20 and information related to the elevator operation status. The information on the elevator operation status includes information on whether or not an emergency stop signal has been generated, that is, information on whether or not the hoisting machine brake 4 is in an emergency braking operation. The slip determining unit 21 compares the slip speed obtained by the slip speed calculating unit 20 with the first and second speed thresholds, and commands the various safety device operating units 22 according to the comparison result and the elevator operation status. Is output.

  Here, the emergency stop operation command device 19 has, for example, a microcomputer. The functions of the slip speed calculation unit 20 and the slip determination unit 21 are realized by a microcomputer. In addition, a program for realizing the functions of the slip speed calculation unit 20 and the slip determination unit 21 is stored in the storage unit of the microcomputer.

  FIG. 3 is a flowchart showing the operation of the slippage determining unit 21 of FIG. The slip determination unit 21 first determines the presence or absence of an emergency stop signal (step S1). When the emergency stop signal is not generated, it is determined whether the slip speed exceeds the first speed threshold value Va (step S2). If the slip speed is equal to or less than the first speed threshold Va, normal operation is continued.

  When the sliding speed exceeds the first speed threshold Va, +1 is counted for the cumulative number C1 exceeding the first speed threshold Va (step S3), and a designated floor stop command is generated (step S4). When the designated floor stop command is generated, the car 8 is moved to a predetermined floor and stopped. The floor on which the car 8 is stopped is, for example, a preset floor such as an entrance floor or the nearest floor.

  After outputting the designated floor stop command, the slip determination unit 21 determines whether the slip speed exceeds the second speed threshold value Vb (step S5). When the sliding speed exceeds the second speed threshold value Vb, a hoisting machine emergency stop command and an emergency stop operation command (operation signal) are generated in order to suppress damage to the suspension body 7 (step S6). When the hoisting machine emergency stop command is generated, the energization to the electric motor 2 is interrupted, and the hoisting machine brake 4 brakes the rotation of the drive sheave 3. When the emergency stop operation command is generated, the emergency stop device 11 is braked by the emergency stop drive unit 11a.

  On the other hand, if the sliding speed does not exceed the second speed threshold value Vb, it is determined whether or not the cumulative number C1 exceeds a preset specified value α (step S7). When C1 is α or less, the operation of the car 8 is returned to the normal operation after the car 8 is stopped on the designated floor. If C1 exceeds α, it is determined that damage to the suspension body 7 may be accumulated, and an emergency stop operation command is generated after the car 8 is stopped on the designated floor (step S8). Waiting for maintenance inspection by maintenance personnel.

  The above is the operation when the emergency stop signal is not generated, but even when the emergency stop signal is generated, it is first determined whether or not the slipping speed exceeds the first speed threshold value Va (step S9). . If the slip speed is equal to or lower than the first speed threshold Va, it is determined whether the slip speed exceeds the second speed threshold Vb (step S11).

  If the slip speed exceeds the first speed threshold Va, the cumulative number C1 is incremented by +1 (step S10), and then it is determined whether the slip speed exceeds the second speed threshold Vb (step S10). Step S11).

  When the sliding speed exceeds the second speed threshold value Vb, an emergency stop operation command is generated in order to suppress damage to the suspension body 7 (step S12). When the sliding speed does not exceed the second speed threshold value Vb, it is determined whether or not the cumulative number C1 exceeds a preset specified value α (step S13). When C1 is equal to or less than α, the emergency stop device 11 remains inactive and waits for an emergency stop state to be recovered by an emergency stop signal. If C1 exceeds α, it is determined that there is a possibility that damage to the suspension body 7 has accumulated, and an emergency stop operation command is generated after an emergency stop by the hoist 1 (step S14). Waiting for maintenance inspection by an employee.

  The emergency stop operation command device 19 periodically performs the determination operation as described above at a predetermined cycle.

  In such an elevator apparatus, the sliding speed of the suspension body 7 with respect to the drive sheave 3 is calculated based on the signals from the first and second speed detectors 5 and 18, and the sliding speed is set to the first speed threshold value Va. When it exceeds, the car 8 is stopped at the designated floor by the hoisting machine 1, and when the slip speed exceeds the second speed threshold value Vb, the emergency stop device 11 is operated by outputting an operation signal to the emergency stop drive unit 11a. Damage to the suspension body 7 due to excessive sliding of the suspension body 7 with respect to the sheave 3 can be suppressed, and cumulative damage to the suspension body 7 due to minute sliding of the suspension body 7 can be prevented.

In addition, when the slip speed exceeds the first speed threshold Va during the emergency braking operation of the hoisting machine brake 4, priority is given to the emergency braking operation by the hoisting machine brake 4 over the designated floor stopping operation. Can be improved.
Furthermore, if the number of times C1 at which the sliding speed exceeds the first speed threshold value Va exceeds a preset specified value α, the emergency stop device 11 is operated after the car 8 is stopped on a predetermined floor, so Accumulated damage of the suspension body 7 caused by a slippage can be detected at an early stage, and a decrease in service of the elevator apparatus can be prevented.

  Note that the number of times C1 at which the slip speed exceeds the first speed threshold Va is a numerical value representing the cumulative slip amount, and may be, for example, an accumulated value of the slip speed δV. In this case, for example, when the cumulative value of the slip speed δV exceeding the first speed threshold Va exceeds a preset specified value, the emergency stop device 11 is operated after the car 8 is stopped at a predetermined floor. .

Embodiment 2. FIG.
Next, FIG. 4 is a block diagram showing a main part of an elevator apparatus according to Embodiment 2 of the present invention. In the second embodiment, the emergency stop operation command device 19 calculates the slip distance of the suspension body 7 with respect to the drive sheave 3 as the slippage degree value. Moreover, the emergency stop operation command device 19 stops the car 8 at a predetermined floor by the hoist 1 when the sliding distance of the suspension body 7 exceeds the first distance threshold (first threshold). Furthermore, when the slippage distance of the suspension body 7 exceeds the second distance threshold value (second threshold value) that is larger than the first distance threshold value, the emergency stop operation command device 19 sends an operation signal to the emergency stop drive unit 11a. Output.

  Furthermore, the emergency stop operation command device 19 includes a slip distance calculation unit 23 and a slip determination unit 21. The slip distance calculator 23 calculates the slip distance of the suspension body 7 with respect to the drive sheave 3 based on the signals from the first and second speed detectors 5 and 18.

Specifically, assuming that the detection speed at the first speed detector 5 is V1, the detection speed at the second speed detector 18 is V2, and the time of traveling for a certain distance is Δt, the slip distance δX is:
δX = ∫ | V1-V2 | dt or δX = ∫ | V1-V2 | Δt
Is required.

  Further, the slip distance calculation unit 23 returns the slip distance δX to the initial value every time the car 8 is started. Here, the slip distance calculation unit 23 resets the slip distance δX that is output immediately before the car 8 starts running from the normal stop state. This prevents malfunction due to error accumulation.

  The slip determination unit 21 compares the slip distance obtained by the slip distance calculation unit 23 with the first and second distance threshold values, and instructs the various safety device operation units 22 according to the comparison result and the elevator operation status. Is output.

  Here, the emergency stop operation command device 19 has, for example, a microcomputer. The functions of the slip distance calculation unit 23 and the slip determination unit 21 are realized by a microcomputer. Further, a program for realizing the functions of the slip distance calculation unit 23 and the slip determination unit 21 is stored in the storage unit of the microcomputer. Other configurations are the same as those in the first embodiment.

  FIG. 5 is a flowchart showing the operation of the slippage determining unit 21 of FIG. The slip determination unit 21 first determines the presence or absence of an emergency stop signal (step S21). When the emergency stop signal is not generated, it is determined whether the slip distance exceeds the first distance threshold value Xa (step S22). If the slippage distance is equal to or less than the first distance threshold value Xa, normal operation is continued.

  When the slippage distance exceeds the first distance threshold value Xa, +1 is counted as the cumulative number C2 of exceeding the first distance threshold value Xa (step S23), and a designated floor stop command is generated (step S24). When the designated floor stop command is generated, the car 8 is moved to a predetermined floor and stopped. The floor on which the car 8 is stopped is, for example, a preset floor such as an entrance floor or the nearest floor.

  After outputting the designated floor stop command, the slippage determining unit 21 determines whether or not the slippage distance exceeds the second distance threshold value Xb (step S25). When the slippage distance exceeds the second distance threshold value Xb, a hoisting machine emergency stop command and an emergency stop operation command (operation signal) are generated in order to suppress damage to the suspension body 7 (step S26). When the hoisting machine emergency stop command is generated, the energization to the electric motor 2 is interrupted, and the hoisting machine brake 4 brakes the rotation of the drive sheave 3. When the emergency stop operation command is generated, the emergency stop device 11 is braked by the emergency stop drive unit 11a.

  On the other hand, if the slippage distance has not exceeded the second distance threshold value Xb, it is determined whether or not the cumulative number C2 has exceeded a preset specified value β (step S27). When C2 is equal to or less than β, the operation of the car 8 is returned to the normal operation after the car 8 is stopped on the designated floor. If C2 exceeds β, it is determined that damage to the suspension body 7 may be accumulated, and an emergency stop operation command is generated after the car 8 is stopped at the designated floor (step S28). Waiting for maintenance inspection by maintenance personnel.

  The above is the operation when the emergency stop signal is not generated, but even when the emergency stop signal is generated, it is first determined whether or not the slippage distance exceeds the first distance threshold value Xa (step S29). . If the slip distance is equal to or less than the first distance threshold value Xa, it is determined whether or not the slip distance exceeds the second distance threshold value Xb (step S31).

  If the slippage distance exceeds the first distance threshold value Xa, the cumulative number C2 is counted as +1 (step S30), and then it is determined whether the slippage distance exceeds the second distance threshold value Xb (step S30). Step S31).

  When the slippage distance exceeds the second distance threshold value Xb, an emergency stop operation command is generated in order to suppress damage to the suspension body 7 (step S32). If the slippage distance has not exceeded the second distance threshold value Xb, it is determined whether or not the cumulative number C2 has exceeded a preset specified value β (step S33). When C2 is less than or equal to β, the emergency stop device 11 remains inactive and waits for an emergency stop state to be recovered by an emergency stop signal. If C2 exceeds β, it is determined that there is a possibility that damage to the suspension body 7 has accumulated, and after an emergency stop by the hoisting machine 1, an emergency stop operation command is generated (step S34), and maintenance is performed. Waiting for maintenance inspection by an employee.

  The emergency stop operation command device 19 periodically performs the determination operation as described above at a predetermined cycle.

  In such an elevator apparatus, the slip distance of the suspension body 7 with respect to the drive sheave 3 is calculated based on the signals from the first and second speed detectors 5 and 18, and the slip distance is set to the first distance threshold value Xa. If it exceeds, the car 8 is stopped at the designated floor by the hoisting machine 1, and when the slip distance exceeds the second distance threshold value Xb, the emergency stop device 11 is operated by outputting an operation signal to the emergency stop drive unit 11a. Damage to the suspension body 7 due to excessive sliding of the suspension body 7 with respect to the sheave 3 can be suppressed, and cumulative damage to the suspension body 7 due to minute sliding of the suspension body 7 can be prevented.

In addition, when the slip distance exceeds the first distance threshold value Xa during the emergency braking operation of the hoisting machine brake 4, the emergency braking operation by the hoisting machine brake 4 is prioritized over the designated floor stopping operation. Can be improved.
Further, when the number of times C1 at which the slip distance exceeds the first distance threshold value Xa exceeds a preset specified value β, the emergency stop device 11 is operated after the car 8 is stopped at a predetermined floor, so that Accumulated damage of the suspension body 7 caused by a slippage can be detected at an early stage, and a decrease in service of the elevator apparatus can be prevented.

  Note that the number of times C1 at which the slip distance exceeds the first distance threshold value Xa is a numerical value representing the cumulative slip amount, and may be, for example, an accumulated value of the slip distance δX. In this case, for example, when the cumulative value of the slip distance δX exceeding the first distance threshold value Xa exceeds a preset specified value, the emergency stop device 11 is activated after the car 8 is stopped at a predetermined floor. .

Embodiment 3 FIG.
Next, FIG. 6 is a block diagram showing a main part of an elevator apparatus according to Embodiment 3 of the present invention. In the third embodiment, the emergency stop operation command device 19 calculates the slip distance and the slip speed of the suspension body 7 with respect to the drive sheave 3 as the slip degree value. The emergency stop operation command device 19 stops the car 8 at a predetermined floor by the hoist 1 when the sliding distance of the suspension body 7 exceeds the distance threshold (first threshold). Furthermore, when the slip speed of the suspension body 7 exceeds the speed threshold value (second threshold value), the emergency stop operation command device 19 outputs an operation signal to the emergency stop drive unit 11a.

  Here, the speed threshold is set so as to correspond to a degree of slip greater than the distance threshold. That is, the speed threshold is set to be larger than a value obtained by dividing the distance threshold by the unit time (specified time).

  Further, the emergency stop operation command device 19 includes a slip speed calculation unit 20, a slip distance calculation unit 23, and a slip determination unit 21. The sliding speed calculation unit 20 calculates the sliding speed of the suspension body 7 as in the first embodiment. The slip distance calculator 23 calculates the slip distance of the suspension body 7 as in the second embodiment.

  The slip determination unit 21 compares the slip distance determined by the slip distance calculation unit 23 with a distance threshold, compares the slip speed determined by the slip speed calculation unit 20 with a speed threshold, and compares the comparison result with the elevator operating status. In response to this, a command is output to the various safety device operating sections 22.

  Here, the emergency stop operation command device 19 has, for example, a microcomputer. The functions of the sliding speed calculation unit 20, the sliding distance calculation unit 23, and the slip determination unit 21 are realized by a microcomputer. In addition, a program for realizing the functions of the sliding speed calculation unit 20, the sliding distance calculation unit 23, and the slip determination unit 21 is stored in the storage unit of the microcomputer. Other configurations are the same as those in the first embodiment.

  FIG. 7 is a flowchart showing the operation of the slippage determining unit 21 of FIG. The slip determination unit 21 first determines the presence or absence of an emergency stop signal (step S41). When the emergency stop signal is not generated, it is determined whether or not the slip distance exceeds the distance threshold value Xc (step S42). If the slippage distance is less than or equal to the distance threshold value Xc, normal operation is continued.

  When the slippage distance exceeds the distance threshold value Xc, +1 is counted for the cumulative number C3 exceeding the distance threshold value Xc (step S43), and a designated floor stop command is generated (step S44). When the designated floor stop command is generated, the car 8 is moved to a predetermined floor and stopped. The floor on which the car 8 is stopped is, for example, a preset floor such as an entrance floor or the nearest floor.

  After outputting the designated floor stop command, the slip determination unit 21 determines whether the slip speed exceeds the speed threshold value Vc (step S45). When the slip speed exceeds the speed threshold value Vc, a hoisting machine emergency stop command and an emergency stop operation command (operation signal) are generated in order to suppress damage to the suspension body 7 (step S46). When the hoisting machine emergency stop command is generated, the energization to the electric motor 2 is interrupted, and the hoisting machine brake 4 brakes the rotation of the drive sheave 3. When the emergency stop operation command is generated, the emergency stop device 11 is braked by the emergency stop drive unit 11a.

  On the other hand, if the sliding speed does not exceed the speed threshold value Vc, it is determined whether or not the cumulative number C3 exceeds a preset specified value γ (step S47). When C3 is γ or less, the operation of the car 8 is returned to the normal operation after the car 8 is stopped on the designated floor. If C3 exceeds γ, it is determined that damage to the suspension body 7 may be accumulated, and an emergency stop operation command is generated after the car 8 is stopped at the designated floor (step S48). Waiting for maintenance inspection by maintenance personnel.

  The above is the operation when the emergency stop signal is not generated, but even when the emergency stop signal is generated, it is first determined whether or not the slip distance exceeds the distance threshold value Xc (step S49). If the slip distance is equal to or less than the distance threshold value Xc, it is determined whether or not the slip speed exceeds the speed threshold value Vc (step S41).

  If the slippage distance exceeds the distance threshold value Xc, the cumulative number C3 is incremented by 1 (step S50), and then it is determined whether the slippage speed exceeds the speed threshold value Vc (step S51).

  When the sliding speed exceeds the speed threshold value Vc, an emergency stop operation command is generated in order to suppress damage to the suspension body 7 (step S52). When the sliding speed does not exceed the speed threshold value Vc, it is determined whether or not the cumulative number C3 exceeds a preset specified value γ (step S53). When C3 is equal to or less than γ, the emergency stop device 11 remains inactive and waits for an emergency stop state to be recovered by an emergency stop signal. If C3 exceeds γ, it is determined that damage to the suspension body 7 may be accumulated, and an emergency stop operation command is generated after the emergency stop by the hoist 1 (step S54). Waiting for maintenance inspection by an employee.

  The emergency stop operation command device 19 periodically performs the determination operation as described above at a predetermined cycle.

  In such an elevator apparatus, the slip distance and slip speed of the suspension body 7 with respect to the drive sheave 3 are calculated based on the signals from the first and second speed detectors 5 and 18, and the slip distance determines the distance threshold value Xc. If it exceeds, the car 8 is stopped at the designated floor by the hoisting machine 1, and if the slip speed exceeds the speed threshold value Vc, an operation signal is output to the emergency stop drive unit 11a and the emergency stop device 11 is operated. Damage to the suspension body 7 due to excessive sliding of the suspension body 7 can be suppressed, and cumulative damage to the suspension body 7 due to minute sliding of the suspension body 7 can be prevented.

Further, when the slip distance exceeds the distance threshold value Xc during the emergency braking operation of the hoisting machine brake 4, priority is given to the emergency braking operation by the hoisting machine brake 4 over the designated floor stop operation, so that the reliability can be improved. Can do.
Further, when the number of times C3 at which the slip distance exceeds the distance threshold value Xc exceeds a preset specified value γ, the emergency stop device 11 is operated after the car 8 is stopped at a predetermined floor, so that a slight slip occurs. It is possible to detect the accumulated damage of the suspended body 7 at an early stage and prevent the service of the elevator apparatus from being lowered.

In addition, although the 1: 1 roping elevator apparatus was shown in FIG. 1, other roping systems may be used.
The operation signal is not limited to an electrical signal, and may be an optical signal, for example.
Further, the second speed detector is not limited to the governor encoder, and for example, a sensor that directly detects the traveling speed of the car or a sensor that detects the moving speed of the suspension can be used. .

Claims (5)

Hoisting machine with drive sheave,
A suspension wound around the drive sheave,
A car that is suspended by a suspended body and raised and lowered by the hoisting machine,
An emergency stop device that is mounted on the car and that stops the car in response to an operation signal.
A first speed detector for generating a signal corresponding to the rotational speed of the hoisting machine;
A second speed detector for generating a signal corresponding to the traveling speed of the car, and a value relating to the degree of slippage of the suspension relative to the drive sheave based on the signals from the first and second speed detectors. When the slippage degree value exceeds a first threshold value, the car is stopped at a predetermined floor by the hoisting machine, and the slippage degree value is larger than the first threshold value. A slip monitoring device that activates the emergency stop device by the activation signal when a second threshold corresponding to the degree is exceeded,
The slip monitoring device calculates a slip speed and a slip distance of the suspension with respect to the drive sheave as the slip degree value, compares the slip distance with a distance threshold that is the first threshold, and calculates the slip speed. The elevator apparatus compared with the speed threshold value which is said 2nd threshold value.   The elevator apparatus according to claim 1, wherein the slip monitoring apparatus returns the slip distance to an initial value every time the car is started. The hoisting machine is provided with a hoisting machine brake for braking the rotation of the drive sheave,
If the slippage degree value exceeds the first threshold during the emergency braking operation of the hoisting machine brake, the emergency braking operation by the hoisting machine brake is prioritized over the operation of stopping the car at a predetermined floor. The elevator apparatus according to claim 1.   The slip monitoring device operates the emergency stop device after stopping the car on a predetermined floor when the number of times the slippage degree value exceeds the first threshold exceeds a predetermined value set in advance. The elevator apparatus according to claim 1.   The slip monitoring device operates the emergency stop device after stopping the car at a predetermined floor when the cumulative value of the slippage degree value exceeding the first threshold exceeds a predetermined value set in advance. The elevator apparatus according to claim 1.

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