Safety system for elevator

Abstract

To prevent the progress of component deterioration by detecting operation abnormality in starting operation for shifting an emergency stop operation device to a standby state.SOLUTION: The emergency stop operation device includes a movable guide member displaceable between an operation position and a normal position, and an actuator for holding the movable guide member energized to the side of the operation position at the normal position. The safety monitoring device cuts off the supply of electric power to the actuator when abnormal running of the car is detected, whereby the safety gear actuating device actuates the safety gear. When the elevator is started, the safety gear actuating device is set in a standby state by displacing the movable guide member from the actuating position to the normal position by a starting operation including the descent of the car. The safety monitoring device outputs an abnormality detection signal when the lowering distance of the car exceeds a threshold value before the movable guide member is displaced to the normal position by the starting operation.SELECTED DRAWING: Figure 18

Description

[Technical Field]

[0001] The present disclosure relates to an elevator safety system with a safety stop device. [Background technology]

[0002] Patent Document 1 discloses a technology relating to an elevator system that includes an emergency stop device installed in the car and an electric trigger that activates the emergency stop device. When the car goes into an overspeed state, the emergency stop device is activated by an electric trigger installed on the top of the car, and grips the car guide rail to brake the car.

[0003] The electric trigger includes a stator having a solenoid core and a mover inserted into the solenoid core so that it can move in and out. An elastic member applies a biasing force to the mover so that the mover is pushed out of the solenoid core. When the electric trigger is in a non-operating state, the mover is held in an attracted state by an electromagnetic force greater than the biasing force. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2021 / 166144 Summary of the Invention [Problem to be solved by the invention]

[0005] There are known emergency stop actuators, such as the electric trigger described in Patent Document 1, that activate an emergency stop device when the power supply to the actuator is cut off. When starting an elevator, the emergency stop actuator must perform a startup operation by applying a force greater than the biasing force to transition the emergency stop actuator to a standby state. Relying solely on the force of the actuator during such startup requires a large capacity, so it is possible to utilize the force generated by the relative displacement between the car and the guide rail. However, when startup involves car movement, technology is needed to monitor the car's travel so that it does not deviate from the startup operation's intended travel.

[0006] The present disclosure has been made to solve the above-mentioned problems, and aims to provide an elevator safety system that can detect operational abnormalities and prevent the progression of component deterioration during the startup operation that transitions the emergency stop operating device to a standby state. [Means for solving the problem]

[0007] The elevator safety system of the present disclosure comprises an emergency stop device that brings an elevator car moving up and down along a guide rail to an emergency stop, a movable guide member that is displaceable between an operating position and a normal position, an operating spring that urges the movable guide member toward the operating position, and an actuator that receives power and holds the movable guide member in the normal position against the operating spring, the emergency stop operating device that activates the emergency stop device when the power supply to the actuator is cut off and the movable guide member is displaced to the operating position, and a safety monitoring device that cuts off the power supply to the actuator if abnormal running of the car is detected, and when the elevator is started up, the emergency stop operating device is configured to displace the movable guide member from the operating position to the normal position based on the force received from the guide rail due to the start-up operation including the lowering of the car, and the safety monitoring device is configured to output an abnormality detection signal if the descent distance of the car exceeds a threshold value before the start-up operation displaces the movable guide member to the normal position. [Effects of the Invention]

[0008] According to the elevator safety system of the present disclosure, it is possible to detect operational abnormalities and prevent the progression of component deterioration during the startup operation that transitions the emergency stop operating device to a standby state. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic diagram showing an elevator according to an embodiment. FIG. [Figure 2] FIG. 2 is a front view showing the car of FIG. 1. [Figure 3] 3 is a side view showing a main part of the safety device of FIG. 2. [Figure 4] FIG. 4 is a side view showing an operating state of the safety device of FIG. 3. [Figure 5] FIG. 3 is a front view showing the safety gear operating device of FIG. 2. [Figure 6] 6 is a front view showing a state immediately after the start of the operating action of the safety gear operating device of FIG. 5.

[0023] FIG. [Figure 7] 7 is a front view showing a state in which the operating wedge of FIG. 6 is displaced upward relative to the movable guide member. [Figure 8] 8 is a front view showing a state in which the operating wedge of FIG. 7 is further displaced upward relative to the movable guide member. FIG. [Figure 9] FIG. 9 is a front view showing the state of the safety gear operating device when the car has descended from the state shown in FIG. 8. [Figure 10] 3 is a front view showing a state in which the lifting rod of FIG. 2 is lifted up. FIG. [Figure 11] 10 is a front view showing a state immediately after the start of the return operation of the safety gear actuating device of FIG. 9.

[0023] FIG. [Figure 12] FIG. 12 is a front view showing the state of the safety gear operating device when the car in FIG. 11 has risen further. [Figure 13] 13 is a front view showing a state in which the operating wedge of FIG. 12 is displaced downward. FIG. [Figure 14] FIG. 1 is a front view showing the state of the safety gear operating device immediately after the elevator starts. [Figure 15] 15 is a front view showing a state in which the operating wedge of FIG. 14 is displaced upward relative to the movable guide member. FIG. [Figure 16] 16 is a front view showing a state in which the operating wedge of FIG. 15 is displaced downward. FIG. [Figure 17] 1 is a diagram showing the configuration of an elevator safety system according to an embodiment. [Figure 18] 4 is a flowchart showing a control routine for a startup operation executed in the safety system according to the embodiment. [Figure 19] FIG. 2 is a diagram illustrating an example of hardware resources of a safety monitoring device. [Figure 20] FIG. 10 is a diagram illustrating another example of hardware resources of the safety monitoring device. DETAILED DESCRIPTION OF THE INVENTION

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

[0011] Embodiment 1. Overall configuration of the elevator safety system according to the embodiment Figure 1 is a schematic diagram showing an elevator according to an embodiment. In the figure, a machine room 2 is provided above a hoistway 1. In the machine room 2, a hoisting machine 3, a deflector sheave 4, an elevator control device 5, and a safety monitoring device 6 are installed.

[0012] The hoist 3 has a drive sheave 7, a hoist motor (not shown), and a hoist brake (not shown). The hoist motor rotates the drive sheave 7. The hoist brake keeps the drive sheave 7 stationary. The hoist brake also brakes the rotation of the drive sheave 7.

[0013] A suspension body 8 is wound around the drive sheave 7 and the deflector sheave 4. A plurality of ropes or belts is used as the suspension body 8. A car 9 is connected to a first end of the suspension body 8. A counterweight 10 is connected to a second end of the suspension body 8.

[0014] The car 9 and counterweight 10 are suspended by a suspension body 8, and move up and down in the hoistway 1 by rotating the drive sheave 7. The drive sheave 7 is provided with a car movement detector 13 that generates a signal corresponding to the movement of the car 9. As the car movement detector 13, for example, an encoder or resolver that generates a signal corresponding to the rotation of the drive sheave 7 is used. The car movement detector may be configured as a governor encoder provided on the governor sheave, a linear encoder mounted on the car 9, a roller encoder provided on the roller shaft of a roller pressed against the car guide rail 11 from above the car 9, or the like. The detection signal output from the car movement detector 13 is sent to the safety monitoring device 6 and the elevator control device 5.

[0015] A pair of car guide rails 11 and a pair of counterweight guide rails 12 are installed in the hoistway 1. The car 9 moves up and down in the hoistway 1 along the pair of car guide rails 11. The counterweight 10 moves up and down in the hoistway 1 along the pair of counterweight guide rails 12. Only one car guide rail 11 and one counterweight guide rail 12 are shown in FIG. 1.

[0016] The elevator control device 5 functions as a travel control device that controls the operation of the car 9 by controlling the hoisting machine 3 based on the detection signal output from the car movement amount detection device 13.

[0017] The safety monitoring device 6 monitors for abnormal running of the car 9. Typically, the safety monitoring device 6 monitors whether the speed of the car 9 has reached an excessive speed based on a detection signal output from the car movement amount detection device 13. The safety monitoring device 6 also monitors whether the acceleration of the car 9 has reached an excessive acceleration based on the detection signal. The excessive speed and excessive acceleration are judgment values ​​for detecting abnormal running of the elevator car 9. The excessive speed and excessive acceleration are preset in the safety monitoring device 6 as judgment values.

[0018] The functions of the elevator control device 5 and the safety monitoring device 6 can each be realized by a computer. The functions of the elevator control device 5 and the safety monitoring device 6 will be described in detail later.

[0019] An emergency stop device 20 is provided under the car 9. The emergency stop device 20 grips the pair of car guide rails 11 to bring the car 9 to an emergency stop. The main parts of the emergency stop device 20 will be described later.

[0020] The safety monitoring device 6 generates an operation command signal when the speed of the car 9 reaches an excessive speed and when the acceleration of the car 9 reaches an excessive acceleration. The operation command signal is a signal that activates the safety device 20.

[0021] The car 9 is equipped with a safety device actuating device 30. The safety device actuating device 30 has an actuating device main body 31 and a lifting rod 32.

[0022] The operating device main body 31 is installed on the top of the car 9. The lifting rod 32 is connected between the operating device main body 31 and the safety device 20. The transmission mechanism of the embodiment is composed of the lifting rod 32. The operating device main body 31 lifts the lifting rod 32 in response to an operation command signal from the safety monitoring device 6, and activates the safety device 20. The main parts of the safety device operating device 30 will be described later.

[0023] 2. Configuration of the emergency stop device 20 Fig. 2 is a front view showing the car 9 of Fig. 1. The safety device 20 has an operating lever 21, an interlocking lever 22, a connecting rod 23, and an operating state detection device 50.

[0024] The operating lever 21 is rotatable around a horizontal operating lever shaft 21a together with the operating lever shaft 21a relative to the car 9. The interlocking lever 22 is rotatable around a horizontal interlocking lever shaft 22a together with the interlocking lever shaft 22a relative to the car 9.

[0025] The connecting rod 23 is rotatably connected to the operating lever 21 and the interlocking lever 22. The connecting rod 23 transmits the rotation of the operating lever 21 to the interlocking lever 22, causing the interlocking lever 22 to rotate in conjunction with the operating lever 21. At this time, the direction of rotation of the interlocking lever 22 about the interlocking lever shaft 22a is opposite to the direction of rotation of the operating lever 21 about the operating lever shaft 21a.

[0026] The upper end of the lifting rod 32 is connected to the actuator body 31. The lower end of the lifting rod 32 is rotatably connected to the operating lever 21. When the lifting rod 32 is pulled up, the operating lever 21 rotates counterclockwise in FIG. 2, and the interlocking lever 22 rotates clockwise in FIG. 2.

[0027] Fig. 3 is a side view showing the main part of the safety device 20 of Fig. 2. Fig. 4 is a side view showing the safety device 20 of Fig. 3 in an operating state.

[0028] 2, the safety device 20 has a safety frame 24, a pair of wedge guides 25, a pair of wedge guide springs 26, a pair of wedge members 27, and a pair of wedge connecting links 28. In FIG. 3, the pair of wedge connecting links 28 are omitted.

[0029] The emergency stop frame 24 is fixed to the bottom of the car 9. Each wedge guide spring 26 is provided between the corresponding wedge guide 25 and the emergency stop frame 24. Each wedge member 27 is connected to the operating lever shaft 21a via a corresponding wedge connecting link 28.

[0030] When the safety device 20 is inactive, each wedge member 27 faces the car guide rail 11 at a distance. When the safety device 20 is active, the pair of wedge members 27 are moved upward relative to the safety frame 24 by rotation of the operating lever shaft 21a. At this time, each wedge member 27 is guided by the corresponding wedge guide 25 and approaches the car guide rail 11, coming into contact with the car guide rail 11.

[0031] When each wedge member 27 comes into contact with the car guide rail 11, a braking force is generated in the direction opposite to the falling direction of the car 9, and the car 9 is stopped. The magnitude of the braking force is the product of the pressing force of the pair of wedge members 27 against the car guide rail 11 by the pair of wedge guide springs 26 and the coefficient of friction between each wedge member 27 and the car guide rail 11.

[0032] 3 and 4 is also provided on the interlocking lever shaft 22a side. When the safety device 20 is activated, the safety device 20 simultaneously grips the pair of car guide rails 11.

[0033] The activation state detection device 50 is a device for detecting the activation state of the emergency stop device 20. The emergency stop device 20 switches from an inactivated state to an activated state when the activation lever 21 rotates counterclockwise in FIG. 2 and the pull-up rod 32 is pulled up. The activation state detection device 50 is, for example, a mechanical switch installed in a position where it can detect that the activation lever 21 has rotated counterclockwise in FIG. 2. With this configuration, the activation state detection device 50 outputs an ON signal when the emergency stop device 20 is activated, and outputs an OFF signal when the emergency stop device 20 is deactivated. The signal output from the activation state detection device 50 is sent to the safety monitoring device 6.

[0034] 3. Configuration of the emergency stop operating device 30 Fig. 5 is a front view showing the safety gear actuator 30 of Fig. 2. The actuator body 31 has a fixed frame 40, a lifting frame 41, a lateral movement frame 42, a plurality of return springs 43, a movable guide member 44, a plurality of operating springs 45, an actuator 46, an operating wedge 47, a braking member 48, a plurality of main springs 49, and a position detection device 52.

[0035] The fixed frame 40 is fixed to the upper part of the car 9. The lifting frame 41 is provided inside the fixed frame 40. The lifting frame 41 is displaceable in the vertical direction relative to the car 9 between a non-raised position and a raised position.

[0036] The non-raised position is a position where the lifting frame 41 is placed on the bottom surface of the fixed frame 40, as shown in Fig. 5. The lifted position is a position where the lifting frame 41 is raised above the bottom surface of the fixed frame 40, as shown in Fig. 10, which will be described later. In other words, the lifted position is a position higher than the non-raised position.

[0037] The fixed frame 40 regulates the horizontal displacement of the lifting frame 41 and also guides the vertical displacement of the lifting frame 41.

[0038] The lifting frame 41 is displaced from the non-raised position to the raised position, thereby lifting the lifting rod 32 and activating the safety device 20. At this time, the lifting rod 32 transmits the upward displacement of the lifting frame 41 to the safety device 20.

[0039] The lateral movement frame 42 is provided inside the lifting frame 41. The lateral movement frame 42 is displaceable in the horizontal direction relative to the lifting frame 41, i.e., in the front-to-rear direction of the car 9, between a first horizontal position and a second horizontal position. The front-to-rear direction of the car 9 is a direction perpendicular to a line connecting the centers of the pair of car guide rails 11 when viewed from directly above the car 9, and is a direction parallel to the Y-axis in FIG.

[0040] The first horizontal position is the position shown in Fig. 5. The second horizontal position is a position where the actuator 46 is farther from the car guide rails 11 than at the first horizontal position, as shown in Fig. 8, which will be described later. The lifting frame 41 guides the horizontal displacement of the lateral movement frame 42.

[0041] The plurality of return springs 43 are provided between the lifting frame 41 and the lateral movement frame 42. Furthermore, the plurality of return springs 43 are each compressed when the lateral movement frame 42 is displaced to the second horizontal position. As a result, the plurality of return springs 43 generate a force that returns the lateral movement frame 42 to the first horizontal position.

[0042] The movable guide member 44 is provided inside the lateral movement frame 42. The movable guide member 44 is displaceable in the horizontal direction relative to the lateral movement frame 42, i.e., in the front-to-rear direction of the car 9, between a normal position and an operating position.

[0043] The normal position is the position shown in Fig. 5. The operating position is a position where the movable guide member 44 is closer to the car guide rail 11 than the normal position, as shown in Fig. 6, which will be described later. In the following description, the state where the movable guide member 44 is displaced to the normal position is referred to as the "normal state."

[0044] The movable guide member 44 also has a guide surface 44a. The guide surface 44a faces a side surface of the car guide rail 11. The guide surface 44a is inclined with respect to the car guide rail 11 so as to approach the car guide rail 11 as it extends upward.

[0045] The plurality of operating springs 45 are provided between the lateral movement frame 42 and the movable guide member 44. The plurality of operating springs 45 are compressed when the movable guide member 44 is located in the normal position.

[0046] The actuator 46 is provided between the horizontal movement frame 42 and the movable guide member 44. As the actuator 46, for example, a solenoid is used.

[0047] During normal operation of the car 9, the actuator 46 generates a force that holds the movable guide member 44 in the normal position against the plurality of operating springs 45. When the supply of electricity to the actuator 46 is cut off, the plurality of operating springs 45 displace the movable guide member 44 to the operating position.

[0048] The operating wedge 47 is provided between the movable guide member 44 and the car guide rail 11. The operating wedge 47 is displaceable in the vertical direction relative to the movable guide member 44 along the guide surface 44a.

[0049] The braking member 48 is provided inside the lateral movement frame 42. The braking member 48 faces the car guide rail 11 on the opposite side of the car guide rail 11 from the movable guide member 44. During normal operation of the car 9, a gap is provided between the operating wedge 47 and the braking member 48 and the car guide rail 11 so as not to interfere with the running of the car 9.

[0050] A plurality of main springs 49 are provided between the lateral movement frame 42 and the braking member 48 .

[0051] The position detector 52 is a device that detects whether the movable guide member 44 has been displaced to its normal position. The position detector 52 is, for example, a mechanical switch that outputs an ON signal when the movable guide member 44 is in its normal position and outputs an OFF signal when the movable guide member 44 is displaced from the normal position toward its operating position. The detection signal output from the position detector 52 is sent to the safety monitor 6.

[0052] 4. Operations realized by the emergency stop device 20 and the emergency stop operating device 30 The safety device 20 and safety actuating device 30 described above realize the operating operation, the returning operation, and the starting operation by utilizing the relative displacement of the car 9 with respect to the car guide rail 11. These operations will be described in detail below.

[0053] 4-1.Operation First, the operating operation of the safety device 20 and the safety actuator 30 will be described. The operating operation is an operation for operating the safety device 20 and the safety device 20 to bring the car 9 to an emergency stop. Fig. 6 is a front view showing the state of the safety device actuator 30 in Fig. 5 immediately after the start of the operating operation. When the safety monitoring device 6 generates an operation command signal while the car 9 is descending, power to the hoisting machine 3 is cut off. In addition, power to the actuator 46 is cut off, the movable guide member 44 is displaced to the operating position, and the operating wedge 47 comes into contact with the car guide rail 11.

[0054] 6 is displaced upward relative to the movable guide member 44. When the operating wedge 47 comes into contact with the car guide rail 11, the operating wedge 47 is displaced upward relative to the movable guide member 44 along the guide surface 44a due to the frictional force acting between the operating wedge 47 and the car guide rail 11. This causes the movable guide member 44 to be pushed back toward the normal position against the multiple operating springs 45.

[0055] 7 is displaced further upward relative to the movable guide member 44. After the movable guide member 44 returns to its normal position, when the operating wedge 47 is displaced further upward relative to the movable guide member 44, the lateral movement frame 42 is displaced in a direction in which the braking member 48 comes into contact with the car guide rail 11.

[0056] After the braking member 48 comes into contact with the car guide rail 11, when the operating wedge 47 is displaced to the upper end of the guide surface 44a, the lateral movement frame 42 is displaced to the second horizontal position, and the plurality of return springs 43 and the plurality of main springs 49 are compressed. As a result, the car guide rail 11 is sandwiched between the operating wedge 47 and the braking member 48.

[0057] Figure 9 is a front view showing the state of the safety gear operating device 30 when the car 9 is lowered from the state shown in Figure 8. When the car 9 is lowered from the state shown in Figure 8, the lifting frame 41 is displaced upward from the non-raised position to the raised position. As a result, the lateral movement frame 42 is also displaced upward, and the lifting rod 32 is raised.

[0058] In this way, by the movable guide member 44 being displaced to the operating position, the operating wedge 47 comes into contact with the car guide rail 11 and is displaced upward relative to the movable guide member 44 along the guide surface 44a, and the lateral movement frame 42 is displaced horizontally relative to the lifting frame 41. As a result, the car guide rail 11 is sandwiched between the operating wedge 47 and the braking member 48, the multiple main springs 49 are compressed, and the lifting frame 41 is displaced to the lifting position.

[0059] Fig. 10 is a front view showing a state in which the lifting rod 32 of Fig. 2 is lifted. When the lifting rod 32 is lifted, the operating lever 21 and the interlocking lever 22 each rotate, and the safety device 20 is activated. This brings the car 9 to an emergency stop.

[0060] 4-2.Return operation Next, the return operation of the emergency stop device 20 and the emergency stop operating device 30 after an emergency stop of the car 9 will be described. The return operation is an operation for returning the emergency stop device 20 and the emergency stop operating device 30 after an emergency stop to the standby state before the emergency stop. When the emergency stop device 20 and the emergency stop operating device 30 are caused to perform the return operation, current is applied to the actuator 46, and the movable guide member 44 is held in the normal position. Next, the hoisting machine 3 lifts the car 9 from the state shown in FIG. 10.

[0061] Fig. 11 is a front view showing the state immediately after the start of the return operation of the safety gear actuating device 30 in Fig. 9. Since the car guide rail 11 is sandwiched between the operating wedge 47 and the braking member 48, when the fixed frame body 40 rises due to the rise of the car 9, the lateral movement frame body 42 descends relative to the fixed frame body 40 and the car 9.

[0062] As a result, the lifting rod 32 descends relative to the car 9, the operating lever 21 rotates clockwise in FIG. 10, and the interlocking lever 22 rotates counterclockwise in FIG.

[0063] Figure 12 is a front view showing the state of the safety gear operating device 30 when the car 9 in Figure 11 has risen further. When the car 9 has risen further, the lifting frame 41 returns to the non-raised position, the operating lever 21 and the interlocking lever 22 return to the positions shown in Figure 2, and the pair of wedge members 27 return from the state in Figure 4 to the state in Figure 3.

[0064] Figure 13 is a front view showing a state in which the operating wedge 47 in Figure 12 has been displaced downward. When the car 9 rises further from the state in Figure 12, a gap is created between the operating wedge 47 and the car guide rail 11, and the operating wedge 47 falls along the guide surface 44a.

[0065] As a result, each return spring 43 is restored to its original position, the horizontal movement frame 42 is returned to the first horizontal position, and the braking member 48 moves away from the car guide rail 11.

[0066] 4-3.Startup operation Next, a description will be given of the start-up operation of the emergency stop device 20 and the emergency stop actuating device 30. The start-up operation is an operation for setting the emergency stop device 20 and the emergency stop actuating device 30 to a standby state when the elevator is started.

[0067] Figure 14 is a front view showing the state of the emergency stop operating device 30 immediately after the elevator is started. When the elevator is started, the lifting frame 41 is in the non-raised position, so the operating lever 21 and interlocking lever 22 are in the positions shown in Figure 2, and the pair of wedge members 27 are in the state shown in Figure 3. In addition, the movable guide member 44 is displaced to the operating position by the biasing force of multiple operating springs 45, and the operating wedge 47 is in contact with the car guide rail 11. During the start-up operation, electricity is supplied to the actuator 46, but the actuator 46 cannot generate a force that would displace the movable guide member 44 in the operating position to the normal position, so the positions of the movable guide member 44 and the operating wedge 47 do not change.

[0068] 15 is a front view showing a state in which the operating wedge 47 of FIG. 14 is displaced upward relative to the movable guide member 44. When the car 9 is lowered in the state of FIG. 14, the operating wedge 47 is displaced upward relative to the movable guide member 44 along the guide surface 44a due to the frictional force acting between the operating wedge 47 and the car guide rail 11. As a result, the movable guide member 44 is pushed back toward the normal position against the multiple operating springs 45, and is held in the normal position by the actuator 46.

[0069] Figure 16 is a front view showing a state in which the operating wedge 47 in Figure 15 has been displaced downward. When the car 9 is raised from the state in Figure 15, a gap is created between the operating wedge 47 and the car guide rail 11, and the operating wedge 47 falls along the guide surface 44a. This sets the safety device 20 and the safety actuating device 30 to a standby state.

[0070] In such an elevator safety device 30, a movable guide member 44, a plurality of operating springs 45, an actuator 46, an operating wedge 47, a braking member 48, and a main spring 49 are provided on a horizontally moving frame 42. The horizontally moving frame 42 is capable of being displaced in the horizontal direction.

[0071] Therefore, during the return operation, the car 9 is raised to drop the operating wedge 47, return the lateral movement frame 42 to the first horizontal position, and separate the braking member 48 from the car guide rail 11. This makes it possible to reduce the driving force and range of motion required of the actuator 46, and to reduce the capacity of the actuator 46.

[0072] Furthermore, since the lateral movement frame 42 is displaceable in the horizontal direction, the safety device 20 can be stably operated even when the distance between the normal position and the operating position varies.

[0073] The car 9 is also provided with a fixed frame 40. The fixed frame 40 guides the vertical displacement of the lifting frame 41. This allows the lifting frame 41 to be stably displaced between the non-raised position and the lifted position, and the safety device 20 to be stably operated.

[0074] Furthermore, during the start-up operation, by lowering the car 9, the frictional force acting between the operating wedge 47 and the car guide rail 11 displaces the operating wedge 47 upward along the guide surface 44a relative to the movable guide member 44, thereby pushing the movable guide member 44 back to the normal position. This makes it possible to reduce the driving force and range of motion required for the actuator 46.

[0075] 5. Features of the safety system of the embodiment In the emergency stop operating device 30, the frictional force between the operating wedge 47 and the car guide rail 11 can decrease due to factors such as deterioration of parts or adhesion of oil to the car guide rail 11. In this case, the descent distance of the car 9 required for the start-up operation may increase, or the start-up may fail. If such a condition is left unattended, there is a risk that the device will deteriorate further, so it is necessary to detect it early and take measures.

[0076] The safety system of this embodiment is characterized by its operation of detecting abnormal operation during startup. The configuration and operation of the safety system will be described below.

[0077] 17 is a diagram showing the configuration of an elevator safety system according to an embodiment. The safety system mainly comprises a position detection device 52, an operation status detection device 50, a car movement amount detection device 13, a safety monitoring device 6, an elevator control device 5, a safety stop operating device 30, and a safety stop device 20. The safety monitoring device 6 comprises a power supply control unit 61, a movement distance calculation unit 62, a position detection unit 63, an abnormality determination unit 64, and a signal output unit 65 as functional blocks that perform processing to realize various functions.

[0078] The power supply control unit 61 is a functional block for controlling the power supplied to the actuator 46 of the safety gear actuation device 30 .

[0079] The movement distance calculation unit 62 is a functional block for calculating the movement distance of the car 9 based on the detection signal output from the car movement amount detection device 13. This processing will be referred to as "movement distance calculation processing" hereinafter.

[0080] The position detection unit 63 is a functional block for detecting that the movable guide member 44 has been displaced to its normal position based on the detection signal output from the position detection device 52. This processing will be referred to as "position detection processing" hereinafter.

[0081] The abnormality determination unit 64 is a functional block for determining whether or not there is an operational abnormality during the startup operation. Typically, the abnormality determination unit 64 determines that there is an operational abnormality when the downward movement distance of the car 9 during the startup operation exceeds a threshold value. This processing is hereinafter referred to as "abnormality determination processing." The threshold value here is the limit value of the downward movement distance of the car 9 that is permitted during the startup operation, and a predetermined value is used.

[0082] The signal output unit 65 is a functional block for outputting various signals. Examples of signals output from the signal output unit 65 include an abnormality detection signal indicating an operation abnormality during startup, a signal for instructing the car 9 to travel, and a signal for supplying power to the actuator 46.

[0083] The safety monitoring device 6 executes the startup operation according to the following flowchart to determine whether or not there is an operational abnormality during the startup operation. Figure 18 is a flowchart showing a control routine for the startup operation executed in the safety system according to the embodiment. The routine shown in Figure 18 is executed by the safety monitoring device 6 when the elevator is started up.

[0084] In step S100, it is determined whether or not the inoperative state of the emergency stop device 20 has been detected. Here, it is determined whether or not an OFF signal indicating the inoperative state of the emergency stop device 20 has been transmitted from the operation state detection device 50. As a result, if the emergency stop device 20 is in an inoperative state, it is determined that the elevator is starting up, and the process proceeds to step S102. On the other hand, if the emergency stop device 20 is in an activated state, it is determined that it is not in a normal state at startup, and the process proceeds to step S116.

[0085] In step S102, the power supply control unit 61 supplies power to the actuator 46, and the process proceeds to step S104. In step S104, the movement distance calculation unit 62 starts movement distance calculation processing, and starts calculating the movement distance of the car 9 from the current time. After the process of step S104 is performed, the process proceeds to step S106.

[0086] In step S106, a command to perform slow-speed down travel, which causes the car 9 to descend at a slow speed by a specified distance, is output to the elevator control device 5. Upon receiving the command to perform slow-speed down travel, the elevator control device 5 controls the hoist 3 to lower the car 9. After the processing of step S106 is performed, the processing proceeds to step S108.

[0087] In step S108, the position detection unit 63 executes a position detection process to determine whether the movable guide member 44 has been displaced to the normal position. If the determination is affirmative, the process proceeds to step S112; if the determination is negative, the process proceeds to step S110.

[0088] In step S110, the abnormality determination unit 64 executes an abnormality determination process to determine whether the movement distance calculated by the movement distance calculation process exceeds a threshold value. If the determination is affirmative, it is determined that an abnormal operation has occurred, and the process proceeds to step S116. In step S116, the signal output unit 65 outputs an abnormality detection signal to the elevator control device 5. Upon receiving the abnormality detection signal, the elevator control device 5 controls the brake of the hoisting machine 3 to bring the car 9 to an emergency stop. Once step S116 is executed, the process of this routine ends. On the other hand, if the determination in step S110 is negative, the process returns to step S106.

[0089] In step S112, a command to perform slow-speed up travel, which causes the car 9 to rise a specified distance at a slow speed, is output to the elevator control device 5. In response to the command to perform slow-speed up travel, the elevator control device 5 controls the hoist 3 to raise the car 9. As a result, a gap is created between the operating wedge 47 and the car guide rail 11, and the operating wedge 47 falls along the guide surface 44a. This sets the safety device 20 and the safety actuating device 30 to a standby state. After the processing of step S112 is performed, the processing proceeds to step S114. In step S114, a startup operation completion signal indicating completion of the startup operation is output to the elevator control device 5. Upon receiving the startup operation completion signal, the elevator control device 5 starts normal travel. After the processing of step S114 is performed, the processing of this routine ends.

[0090] According to the above-described start-up operation, an operational abnormality during the start-up operation can be detected and the car 9 can be brought to an emergency stop. This makes it possible to prevent deterioration of the emergency stop operating device 30 and also to complete the start-up operation without the presence of an operator.

[0091] 6. Modifications of the embodiment The elevator safety system of the embodiment may be modified as follows.

[0092] 6-1. Hardware resources of safety monitoring device 6 19 is a diagram showing an example of hardware resources of a safety monitoring device. The safety monitoring device 6 includes, as hardware resources, a processing circuit 74 including a processor 70 and a memory 72. The processing circuit 74 may include multiple processors 70. The processing circuit 74 may also include multiple memories 72.

[0093] In this embodiment, the functions of the safety monitoring device 6 can be realized by software written as a program, firmware, or a combination of software and firmware. The program is stored in the memory 72. The safety monitoring device 6 realizes each function by executing the program stored in the memory 72 by the processor 70 (computer).

[0094] The processor 70 is also called a CPU (Central Processing Unit), central processing unit, processing unit, arithmetic unit, microprocessor, microcomputer, or DSP. The memory 72 may be a semiconductor memory, a magnetic disk, a flexible disk, an optical disk, a compact disk, a minidisk, or a DVD. Usable semiconductor memory includes RAM, ROM, flash memory, EPROM, EEPROM, etc.

[0095] Fig. 20 is a diagram showing another example of hardware resources of a safety monitoring device. In the example shown in Fig. 20, the safety monitoring device 6 includes a processing circuit 78 including, for example, a processor 70, a memory 72, and dedicated hardware 76. Fig. 20 shows an example in which some of the functions of the safety monitoring device 6 are realized by the dedicated hardware 76. All of the functions of the safety monitoring device 6 may also be realized by the dedicated hardware 76. The dedicated hardware 76 may be a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC, an FPGA, or a combination thereof.

[0096] 6-2. Position detection device 52 The position detector 52 is not limited in its location and in the configuration of the detector means, as long as it is configured to be able to detect that the movable guide member 44 has been displaced to the normal position.

[0097] 6-3. Operational state detection device 50 The activation state detection device 50 is not limited in its location or in the configuration of its detection means, as long as it is configured to be able to detect whether the safety device 20 is in an activated state or an inactivated state.

[0098] 6-4. Safety monitoring device 6 Furthermore, the safety monitoring device 6 may monitor only either the excessive speed of the car 9 or the excessive acceleration of the car 9 .

[0099] A part or all of the processing performed in the safety monitoring device 6 may be performed in the elevator control device 5.

[0100] The slow speed reduction command output in step S106 of the routine shown in Fig. 18 may be a command to continue traveling without setting the travel distance to a specified distance. In this case, if the determination is not established in the abnormality determination process in step S110, the process may proceed to step S108.

[0101] 6-5. Emergency stop operating device 30 The connection point of the lifting rod 32 to the actuator body 31 is not limited to the lateral movement frame 42. For example, the upper end of the lifting rod 32 may be rotatably connected to the movable guide member 44. Alternatively, the upper end of the lifting rod 32 may be rotatably connected to the brake member 48.

[0102] Elevator The overall layout of the elevator is not limited to the layout shown in Figure 1. For example, the roping system may be a 2:1 roping system.

[0103] The elevator may also be a machine room-less elevator, a double-deck elevator, a one-shaft multi-car elevator, etc. In a one-shaft multi-car elevator, an upper car and a lower car located directly below the upper car each independently ascend and descend in a common elevator shaft.

[0104] 7.Other Although the preferred embodiments have been described in detail above, the present disclosure is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the claims.

[0105] Various aspects of the present disclosure are summarized below as appendices.

[0106] (Appendix 1) An emergency stop device that brings the elevator car up and down along the guide rails to an emergency stop; a safety device operating device comprising: a movable guide member displaceable between an operating position and a normal position; an operating spring that urges the movable guide member toward the operating position; and an actuator that receives power and holds the movable guide member at the normal position against the operating spring, the safety device operating when the power supply to the actuator is cut off and the movable guide member is displaced to the operating position; a safety monitoring device that cuts off the supply of power to the actuator when abnormal running of the car is detected, When the elevator is started, the safety stop operating device is configured to displace the movable guide member from the operating position to the normal position based on a force received from the guide rail due to a start-up operation including a lowering of the car, The safety monitoring device includes: If the descending distance of the car exceeds a threshold value before the movable guide member is displaced to the normal position by the activation operation, an abnormality detection signal is output. An elevator safety system configured as follows: (Appendix 2) 2. The elevator safety system of claim 1, wherein the safety monitoring device is configured to supply the power to the actuator when the elevator is started. (Appendix 3) a travel control device that controls the travel of the car in accordance with an operation command output from the safety monitoring device; a position detection device that detects a normal state in which the movable guide member is displaced to the normal position, When the elevator is started, the safety monitoring device outputs an operation command to the travel control device to lower the car until the position detection device detects the normal state, and when the position detection device detects the normal state, outputs an operation command to the travel control device to temporarily raise the car and then stop it. 3. The elevator safety system of claim 1 or 2, configured so that (Appendix 4) 4. The elevator safety system of claim 3, wherein the travel control device is configured to bring the car to an emergency stop upon receiving the abnormality detection signal. (Appendix 5) An elevator safety system as described in any one of Supplementary Note 1 to Supplementary Note 3, wherein the safety monitoring device is configured to detect the abnormal running of the car when the speed or acceleration of the car reaches a judgment value. (Appendix 6) The safety gear operating device is a lifting frame that is displaceable in the vertical direction between a non-raised position and a lifting position that is a position higher than the non-raised position and that is displaceable from the non-raised position to the lifting position; a transmission mechanism that transmits vertical displacement of the lifting frame relative to the car to the safety device and activates the safety device; a horizontally movable frame provided on the lifting frame so as to be displaceable in a horizontal direction relative to the lifting frame between a first horizontal position and a second horizontal position; a return spring provided between the lifting frame and the lateral movement frame and generating a force to return the lateral movement frame to the first horizontal position, the movable guide member has a guide surface that faces the guide rail and is inclined with respect to the guide rail so as to approach the guide rail as it goes upward, and is provided on the lateral movement frame so as to be displaceable in a horizontal direction relative to the lateral movement frame between the normal position and the operating position, the operating spring is provided between the lateral movement frame and the movable guide member, The safety gear operating device is an operating wedge provided between the movable guide member and the guide rail, the operating wedge being displaceable in the vertical direction relative to the movable guide member along the guide surface; a braking member provided on the lateral movement frame and facing the guide rail on the opposite side of the guide rail from the movable guide member; a main spring provided between the lateral movement frame and the braking member, The elevator safety system of any one of Appendix 1 to Appendix 5 is configured such that, when the movable guide member is displaced to the operating position, the operating wedge contacts the guide rail and displaces upward relative to the movable guide member along the guide surface, the lateral movement frame displaces horizontally relative to the lifting frame, the guide rail is sandwiched between the operating wedge and the braking member, the main spring is compressed, and the lifting frame is displaced to the lifting position. (Appendix 7) An elevator safety system as described in Appendix 6, further comprising a fixed frame body provided on the car to guide the upward and downward displacement of the lifting frame body. (Appendix 8) 8. An elevator safety system according to claim 6 or 7, wherein the transmission mechanism is connected between the lateral movement frame and the emergency stop device. [Explanation of symbols]

[0107] 1 elevator shaft, 2 machine room, 3 hoisting machine, 4 deflector, 5 elevator control device, 6 safety monitoring device, 7 drive sheave, 8 suspension body, 11 car guide rail, 12 counterweight guide rail, 13 car movement amount detection device, 20 emergency stop device, 21 operating lever, 21a operating lever shaft, 22 interlocking lever, 22a interlocking lever shaft, 23 connecting rod, 24 emergency stop frame, 25 wedge guide, 27 wedge member, 28 wedge connecting link, 30 emergency stop operating device, 31 operating device body, 32 lifting rod, 40 fixed frame body, 41 lifting frame body, 42 horizontally moving frame body, 44 movable guide member, 44a guide surface, 46 actuator, 47 Operating wedge, 48 braking member, 50 operating state detection device, 52 position detection device, 61 power supply control unit, 62 movement distance calculation unit, 63 position detection unit, 64 abnormality determination unit, 65 signal output unit, 70 processor, 72 memory, 74 processing circuit, 76 dedicated hardware, 78 processing circuit

Claims

1. An emergency stop device that brings the elevator car up and down along the guide rails to an emergency stop; a safety device operating device comprising: a movable guide member displaceable between an operating position and a normal position; an operating spring that urges the movable guide member toward the operating position; and an actuator that receives power and holds the movable guide member at the normal position against the operating spring, the safety device operating when the power supply to the actuator is cut off and the movable guide member is displaced to the operating position; a safety monitoring device that cuts off the supply of power to the actuator when abnormal running of the car is detected, When the elevator is started, the safety stop operating device is configured to displace the movable guide member from the operating position to the normal position based on a force received from the guide rail due to a start-up operation including a lowering of the car, The safety monitoring device includes: If the descending distance of the car exceeds a threshold value before the movable guide member is displaced to the normal position by the activation operation, an abnormality detection signal is output. An elevator safety system configured as follows:

2. The elevator safety system according to claim 1 , wherein the safety monitoring device is configured to supply the power to the actuator when the elevator starts up.

3. a travel control device that controls the travel of the car in accordance with an operation command output from the safety monitoring device; a position detection device that detects a normal state in which the movable guide member is displaced to the normal position, When the elevator is started, the safety monitoring device outputs an operation command to the travel control device to lower the car until the position detection device detects the normal state, and when the position detection device detects the normal state, outputs an operation command to the travel control device to temporarily raise the car and then stop it.

3. The elevator safety system according to claim 1 or 2, which is configured as follows:

4. 4. The elevator safety system according to claim 3, wherein the travel control device is configured to bring the car to an emergency stop upon receiving the abnormality detection signal.

5. 3. The elevator safety system according to claim 1, wherein the safety monitoring device is configured to detect the abnormal running of the car when the speed or acceleration of the car reaches a judgment value.

6. The safety gear operating device is a lifting frame that is displaceable in the vertical direction between a non-raised position and a lifting position that is a position higher than the non-raised position and that is displaceable from the non-raised position to the lifting position; a transmission mechanism that transmits vertical displacement of the lifting frame relative to the car to the safety device and activates the safety device; a horizontally movable frame provided on the lifting frame so as to be displaceable in a horizontal direction relative to the lifting frame between a first horizontal position and a second horizontal position; a return spring provided between the lifting frame and the lateral movement frame and generating a force to return the lateral movement frame to the first horizontal position, the movable guide member has a guide surface that faces the guide rail and is inclined with respect to the guide rail so as to approach the guide rail as it goes upward, and is provided on the lateral movement frame so as to be displaceable in a horizontal direction relative to the lateral movement frame between the normal position and the operating position, the operating spring is provided between the lateral movement frame and the movable guide member, The safety gear operating device is an operating wedge provided between the movable guide member and the guide rail, the operating wedge being displaceable in the vertical direction relative to the movable guide member along the guide surface; a braking member provided on the lateral movement frame and facing the guide rail on the opposite side of the guide rail from the movable guide member; a main spring provided between the lateral movement frame and the braking member, 3. The elevator safety system of claim 1, wherein when the movable guide member is displaced to the operating position, the operating wedge contacts the guide rail and displaces upward relative to the movable guide member along the guide surface, the lateral movement frame displaces horizontally relative to the lifting frame, the guide rail is sandwiched between the operating wedge and the braking member, the main spring is compressed, and the lifting frame is displaced to the lifting position.

7. 7. The elevator safety system according to claim 6, further comprising a fixed frame provided on the car for guiding the vertical displacement of the lifting frame.

8. 7. The elevator safety system according to claim 6, wherein the transmission mechanism is connected between the lateral movement frame and the safety device.

Images