Safety system of elevator

Abstract

The invention provides a safety system of an elevator, which can detect abnormal operation and prevent the development of deterioration of parts in the starting operation of transferring an emergency stop working device to a standby state. The emergency stop working device is provided with: a movable guide member that is displaceable between a working position and a normal position; and an actuator that holds, at the normal position, the movable guide member that is biased toward the operating position side. When abnormal driving of the elevator car is detected, the safety monitoring device cuts off power supply to the actuator, so that the emergency stop working device enables the emergency stop device to work. When the elevator is started, the emergency stop working device shifts the movable guide member from the working position to the normal position through a starting action including descending of the elevator car and sets the movable guide member to a standby state. The safety monitoring device outputs an abnormality detection signal when the descending distance of the car exceeds a threshold value until the movable guide member is displaced to the normal position by the activation operation.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a safety system of an elevator having an emergency stop device. BACKGROUND

[0002] In Patent Literature 1, a technology related to an elevator device having an emergency stop device provided to a car and an electric trigger that operates the emergency stop device is disclosed. When the car becomes an overspeed state, the emergency stop device is operated by the electric trigger provided to an upper portion of the car and is worked to hold a car guide rail and brake the car.

[0003] The electric trigger has a fixed member having a solenoid core and a movable member that is inserted into the solenoid core in an enterable and exitable manner. The movable member is applied with an acting force that causes the movable member to protrude from the solenoid core to the outside by an elastic member. Then, the electric trigger is held in a state of attracting the movable member by an electromagnetic force that is greater than the acting force in a non-acting state.

[0004] Patent Literature 1: International Publication No. 2021 / 166144

[0005] As the electric trigger of Patent Literature 1, an emergency stop operating device that operates the emergency stop device when a supply of power to an actuator is cut off is known. The emergency stop operating device needs to perform a start-up operation that applies a force that is greater than the acting force to shift the emergency stop operating device to a standby state at the time of start-up of the elevator. In such a start-up operation, when only the force of the actuator is relied on, the capacity needs to be increased, and therefore, it is considered to utilize a force that is generated due to relative displacement of the car and the guide rail. However, in a case where movement of the car is accompanied in the start-up operation, a technology that performs monitoring so that running of the car does not deviate from running for the start-up operation is required. SUMMARY

[0006] The present disclosure is achieved in order to solve the problems as described above, and an object thereof is to provide a safety system of an elevator that can detect an abnormal operation and prevent development of deterioration of a component in a start-up operation that shifts an emergency stop operating device to a standby state.

[0007] The elevator safety system disclosed herein includes: an emergency stop device that causes the elevator car, which moves up and down along the guide rails, to an emergency stop; an emergency stop operating device comprising: a movable guide member capable of shifting between a working position and a normal position; a working spring that applies a force to the movable guide member toward the working position; and an actuator that receives a power supply and resists the working spring to hold the movable guide member in the normal position, wherein the emergency stop operating device operates when the power supply to the actuator is cut off and the movable guide member shifts to the working position; and a safety monitoring device that cuts off the power supply to the actuator when abnormal car movement is detected, wherein, when the elevator starts, the emergency stop operating device is configured to shift the movable guide member from the working position to the normal position based on the force received from the guide rails by the starting action including the descent 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 during the period until the movable guide member shifts to the normal position by the starting action.

[0008] According to the elevator safety system disclosed herein, during the activation action that switches the emergency stop device to standby mode, abnormal operation can be detected to prevent the development of component deterioration. Attached Figure Description

[0009] Figure 1 This is a schematic structural diagram of an elevator according to an embodiment.

[0010] Figure 2 It is shown Figure 1 The front view of the car.

[0011] Figure 3 It is shown Figure 2 A side view of the main parts of the emergency stop device.

[0012] Figure 4 It is shown Figure 3 A side view of the emergency stop device in operation.

[0013] Figure 5 It is shown Figure 2 Front view of the emergency stop device.

[0014] Figure 6 It is shown Figure 5 The main view of the state immediately after the emergency stop device has started operating.

[0015] Figure 7 It is shown Figure 6 The front view of the working wedge after it has been moved upward relative to the movable guide component.

[0016] Figure 8 It is shown Figure 7 The front view of the working wedge after it has been further moved upward relative to the movable guide component.

[0017] Figure 9 It shows the car from Figure 8 A front view of the emergency stop device's status when its condition deteriorates.

[0018] Figure 10 It shows that it was mentioned Figure 2 The main view showing the state of the lifting rod.

[0019] Figure 11 It is shown Figure 9 The main view of the state immediately after the emergency stop device has started its reset action.

[0020] Figure 12 It is shown Figure 11 A front view showing the status of the emergency stop device as the car rises further.

[0021] Figure 13 It is shown Figure 12 The main view of the state after the working wedge has been shifted downwards.

[0022] Figure 14 This is a front view showing the status of the emergency stop device immediately after the elevator has started.

[0023] Figure 15 It is shown Figure 14 The front view of the working wedge after it has been moved upward relative to the movable guide component.

[0024] Figure 16 It is shown Figure 15 The main view of the state after the working wedge has been shifted downwards.

[0025] Figure 17 This is a diagram illustrating the structure of an elevator safety system according to an embodiment.

[0026] Figure 18 This is a flowchart illustrating the control routine for the startup action executed in the safety system of the embodiment.

[0027] Figure 19 This is a diagram illustrating an example of the hardware resources of a security monitoring device.

[0028] Figure 20 This is another example of the hardware resources of a security monitoring device.

[0029] Label Explanation

[0030] 1: Hoistway; 2: Machine Room; 3: Traction Machine; 4: Deflector Sheave; 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 Detection Device; 20: Emergency Stop Device; 21: Working Rod; 21a: Working Rod Shaft; 22: Linkage Rod; 22a: Linkage Rod Shaft; 23: Connecting Rod; 24: Emergency Stop Frame; 25: Wedge Guide; 27: Wedge Component; 28: Wedge Connecting Rod; 30: Emergency Stop Working Device; 31: Working Device Main body; 32: Lifting rod; 40: Fixed frame; 41: Lifting frame; 42: Laterally moving frame; 44: Movable guide component; 44a: Guide surface; 46: Actuator; 47: Working wedge; 48: Braking component; 50: Working status detection device; 52: Position detection device; 61: Power control unit; 62: Movement distance calculation unit; 63: Position detection unit; 64: Anomaly determination unit; 65: Signal output unit; 70: Processor; 72: Memory; 74: Processing circuit; 76: Dedicated hardware; 78: Processing circuit. Detailed Implementation

[0031] The embodiments will now be described with reference to the accompanying drawings. Furthermore, elements shared across the drawings will be labeled with the same reference numerals, and repeated descriptions will be omitted.

[0032] Implementation

[0033] 1. Overall structure of the elevator safety system according to the implementation method

[0034] Figure 1 This is a schematic structural diagram of an elevator according to an embodiment. In the diagram, a machine room 2 is provided above the hoistway 1. The machine room 2 is equipped with a traction machine 3, a deflector sheave 4, an elevator control device 5, and a safety monitoring device 6.

[0035] The traction machine 3 includes a drive sheave 7, a traction machine motor (not shown), and a traction mechanism brake (not shown). The traction machine motor rotates the drive sheave 7. The traction mechanism brake keeps the drive sheave 7 stationary. Furthermore, the traction mechanism brakes the rotation of the drive sheave 7.

[0036] A suspension body 8 is wound on the drive sheave 7 and the deflector sheave 4. Multiple ropes or belts are used as the suspension body 8. A car 9 is connected to the first end of the suspension body 8. A counterweight 10 is connected to the second end of the suspension body 8.

[0037] The car 9 and counterweight 10 are suspended by the suspension body 8 and move up and down within the hoistway 1 by rotating the drive sheave 7. A car movement detection device 13 is provided on the drive sheave 7 to generate a signal corresponding to the movement of the car 9. The car movement detection device 13 can be, for example, an encoder or a rotary transformer that generates a signal corresponding to the rotation of the drive sheave 7. The car movement detection device can also be configured as a speed governor encoder mounted on the speed governor sheave, a linear encoder mounted on the car 9, or a roller encoder mounted on the roller shaft of a roller pressed from the car 9 onto the car guide rail 11. The detection signal output from the car movement detection device 13 is sent to the safety monitoring device 6 and the elevator control device 5.

[0038] A pair of car guide rails 11 and a pair of counterweight guide rails 12 are installed inside the hoistway 1. The car 9 moves up and down within the hoistway 1 along the pair of car guide rails 11. The counterweight 10 moves up and down within the hoistway 1 along the pair of counterweight guide rails 12. Figure 1 Only one car guide rail 11 and one counterweight guide rail 12 are shown in the diagram.

[0039] The elevator control device 5 functions as a travel control device that controls the traction machine 3 based on the detection signal output from the car movement detection device 13, thereby controlling the operation of the car 9.

[0040] Safety monitoring device 6 monitors for abnormal movement of car 9. Typically, safety monitoring device 6 monitors whether the speed of car 9 has reached an excessive speed based on the detection signal output from car movement detection device 13. Furthermore, safety monitoring device 6 monitors whether the acceleration of car 9 has reached an excessive acceleration based on the detection signal. Excessive speed and excessive acceleration are judgment values ​​used to detect abnormal movement of elevator car 9. Excessive speed and excessive acceleration are preset as judgment values ​​in safety monitoring device 6.

[0041] The functions of elevator control device 5 and safety monitoring device 6 can be implemented by computers. The functions of elevator control device 5 and safety monitoring device 6 will be described in detail later.

[0042] An emergency stop device 20 is provided at the lower part of the car 9. The emergency stop device 20 holds a 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.

[0043] If the speed of car 9 reaches an excessive speed or the acceleration of car 9 reaches an excessive acceleration, the safety monitoring device 6 generates a working command signal. The working command signal is a signal that activates the emergency stop device 20.

[0044] The car 9 is equipped with an emergency stop device 30. The emergency stop device 30 has a working device body 31 and a lifting bar 32.

[0045] The main body 31 of the working device is located on the upper part of the car 9. A lifting rod 32 connects the main body 31 of the working device and the emergency stop device 20. The transmission mechanism in this embodiment is constituted by the lifting rod 32. The main body 31 of the working device lifts the lifting rod 32 according to the working command signal from the safety monitoring device 6, thereby activating the emergency stop device 20. The main components of the emergency stop working device 30 will be described later.

[0046] 2. Structure of emergency stop device 20

[0047] Figure 2 It is shown Figure 1 The front view of the car 9. The emergency stop device 20 has a working lever 21, a linkage lever 22, a connecting rod 23, and a working status detection device 50.

[0048] The working rod 21 is capable of rotating about the horizontal working rod axis 21a, and together with the working rod axis 21a, relative to the car 9. The linkage rod 22 is capable of rotating about the horizontal linkage rod axis 22a, and together with the linkage rod axis 22a, relative to the car 9.

[0049] The connecting rod 23 is rotatably connected to both the working rod 21 and the linkage rod 22. Furthermore, the connecting rod 23 transmits the rotation of the working rod 21 to the linkage rod 22, causing the linkage rod 22 to rotate in conjunction with the working rod 21. At this time, the rotation direction of the linkage rod 22 about the linkage rod axis 22a is opposite to the rotation direction of the working rod 21 about the working rod axis 21a.

[0050] The upper end of the lifting rod 32 is connected to the main body 31 of the working device. The lower end of the lifting rod 32 is rotatably connected to the working rod 21. By lifting the lifting rod 32, the working rod 21 moves along... Figure 2 Rotating counterclockwise, linkage 22 along Figure 2 Rotate clockwise.

[0051] Figure 3 It is shown Figure 2 Side view of the main parts of the emergency stop device 20. Figure 4 It is shown Figure 3 A side view of the emergency stop device 20 in its working state.

[0052] Emergency stop device 20 Figure 2 In addition to the structure shown, it also includes an emergency stop frame 24, a pair of wedge guides 25, a pair of wedge guide springs 26, a pair of wedge components 27, and a pair of wedge connecting rods 28. Figure 3 In the middle, a pair of wedge connecting rods 28 are omitted.

[0053] The emergency stop frame 24 is fixed to the lower part of the car 9. Each wedge guide spring 26 is disposed between the corresponding wedge guide 25 and the emergency stop frame 24. Each wedge component 27 is connected to the working rod shaft 21a via the corresponding wedge connecting rod 28.

[0054] When the emergency stop device 20 is not in operation, each wedge component 27 is positioned opposite the car guide rail 11 at intervals. When the emergency stop device 20 is in operation, the pair of wedge components 27 move upward relative to the emergency stop frame 24 by the rotation of the working rod shaft 21a. At this time, each wedge component 27 is guided by the corresponding wedge guide 25 to approach and contact the car guide rail 11.

[0055] When each wedge component 27 contacts the car guide rail 11, a braking force is generated in the opposite direction to the falling direction of the car 9, causing the car 9 to stop. The magnitude of the braking force is the product of the pressing force of the pair of wedge components 27 against the car guide rail 11 generated by the pair of wedge guide springs 26 and the coefficient of friction between each wedge component 27 and the car guide rail 11.

[0056] In addition, a coupling is also provided on the side of the linkage shaft 22a. Figure 3 and Figure 4 The structure shown is the same. Moreover, when the emergency stop device 20 is activated, the emergency stop device 20 simultaneously holds a pair of car guide rails 11.

[0057] The working status detection device 50 is used to detect the working status of the emergency stop device 20. The emergency stop device 20 is located along the working rod 21... Figure 2 When the lifting rod 32 is lifted by rotating counterclockwise, the system switches from a non-working state to a working state. The working state detection device 50 is, for example, installed to detect when the working rod 21 rotates counterclockwise. Figure 2 A mechanical switch that rotates counterclockwise to move to a specific position. Based on this structure, when the emergency stop device 20 is in the activated state, the operational status detection device 50 outputs an ON signal; when the emergency stop device 20 is in the deactivated state, the operational status detection device 50 outputs an OFF signal. The signal output from the operational status detection device 50 is sent to the safety monitoring device 6.

[0058] 3. Structure of the emergency stop device 30

[0059] Figure 5 It is shown Figure 2The front view of the emergency stop working device 30. The working device body 31 has a fixed frame 40, a lifting frame 41, a lateral moving frame 42, multiple return springs 43, a movable guide component 44, multiple working springs 45, an actuator 46, a working wedge 47, a braking component 48, multiple main springs 49 and a position detection device 52.

[0060] The fixed frame 40 is fixed to the upper part of the car 9. The lifting frame 41 is disposed inside the fixed frame 40. In addition, the lifting frame 41 can be moved vertically relative to the car 9 between the non-rising position and the lifting position.

[0061] like Figure 5 As shown, the non-rising position is the position where the frame 41 is lifted and placed on the bottom surface inside the fixed frame 40. (As described later...) Figure 10 As shown, the lifting position is the position where the lifting frame 41 floats up from the bottom surface inside the fixed frame 40. That is, the lifting position is a position higher than the non-lifting position.

[0062] The fixed frame 40 restricts the horizontal movement of the lifting frame 41 and guides the vertical movement of the lifting frame 41.

[0063] The lifting frame 41 is moved from the non-rising position to the lifting position, thereby raising the lifting rod 32 and activating the emergency stop device 20. At this time, the lifting rod 32 transmits the upward displacement of the lifting frame 41 to the emergency stop device 20.

[0064] The lateral moving frame 42 is disposed inside the lifting frame 41. Furthermore, the lateral moving frame 42 can move horizontally relative to the lifting frame 41, i.e., along the longitudinal direction of the car 9, between a first horizontal position and a second horizontal position. The longitudinal direction of the car 9 is perpendicular to the straight line connecting the centers of the pair of car guide rails 11 when viewed from directly above. Figure 5 The direction parallel to the Y-axis.

[0065] The first horizontal position is Figure 5 The location shown. As described later. Figure 8 As shown, the second horizontal position is the position where the actuator 46 is further away from the car guide rail 11 compared to the first horizontal position. Lifting the frame 41 guides the lateral movement of the frame 42, causing it to shift horizontally.

[0066] Multiple return springs 43 are disposed between the lifting frame 41 and the lateral moving frame 42. Furthermore, the multiple return springs 43 are compressed by the displacement of the lateral moving frame 42 towards the second horizontal position. Thus, the multiple return springs 43 generate a force that returns the lateral moving frame 42 to the first horizontal position.

[0067] The movable guide member 44 is disposed inside the transversely moving frame 42. Furthermore, the movable guide member 44 is capable of shifting relative to the transversely moving frame 42 in the horizontal direction, i.e., in the front-to-back direction of the car 9, between the normal position and the working position.

[0068] The usual location is Figure 5 The location shown. As described later. Figure 6 As shown, the working position is a position where the movable guide member 44 is closer to the car guide rail 11 than the normal position. In the following description, the state in which the movable guide member 44 is moved to the normal position is referred to as the "normal state".

[0069] Furthermore, the movable guide member 44 has a guide surface 44a. The guide surface 44a faces the side of the car guide rail 11. In addition, the guide surface 44a is inclined relative to the car guide rail 11 in such a way that it approaches the car guide rail 11 as it goes upward.

[0070] Multiple working springs 45 are disposed between the laterally moving frame 42 and the movable guide member 44. Furthermore, the multiple working springs 45 are compressed when the movable guide member 44 is in its normal position.

[0071] Actuator 46 is disposed between the laterally moving frame 42 and the movable guide member 44. A solenoid is used as an example of actuator 46.

[0072] During normal operation of the car 9, the actuator 46 generates a force that resists the plurality of working springs 45 and holds the movable guide member 44 in its normal position. When the energization to the actuator 46 is cut off, the plurality of working springs 45 displace the movable guide member 44 to its working position.

[0073] The working wedge 47 is disposed between the movable guide member 44 and the car guide rail 11. In addition, the working wedge 47 can be moved vertically relative to the movable guide member 44 along the guide surface 44a.

[0074] Braking component 48 is disposed inside the transversely moving frame 42. Furthermore, braking component 48 is positioned opposite the car guide rail 11 on the side opposite to the movable guide component 44. During normal operation of the car 9, gaps are provided between the working wedge 47 and the braking component 48 and the car guide rail 11, so as not to obstruct the movement of the car 9.

[0075] Multiple main springs 49 are disposed between the transverse moving frame 42 and the braking component 48.

[0076] The position detection device 52 is a device that detects the displacement of the movable guide member 44 to its normal position. The position detection device 52 is, for example, a mechanical switch that outputs an ON signal when the movable guide member 44 is in its normal position and an OFF signal when it has shifted from its normal position toward its working position. The detection signal output from the position detection device 52 is sent to the safety monitoring device 6.

[0077] 4. Actions performed in the emergency stop device 20 and the emergency stop working device 30

[0078] The aforementioned emergency stop device 20 and emergency stop working device 30 achieve working, resetting, and starting actions by utilizing the relative displacement of the car 9 relative to the car guide rail 11. These actions will be described in detail below.

[0079] 4-1. Work Actions

[0080] First, the operation of the emergency stop device 20 and the emergency stop working device 30 will be explained. The working operation is the action used to activate the emergency stop working device 30 and the emergency stop device 20 to bring the car 9 to an emergency stop. Figure 6 It is shown Figure 5 The front view shows the state immediately after the emergency stop device 30 has started operating. During the descent of the car 9, when the safety monitoring device 6 generates a work command signal, the power supply to the traction machine 3 is cut off. Furthermore, the power supply to the actuator 46 is cut off, the movable guide member 44 moves to the working position, and the working wedge 47 contacts the car guide rail 11.

[0081] Figure 7 It is shown Figure 6 The front view shows the working wedge 47 after it has been displaced upward relative to the movable guide member 44. When the working wedge 47 contacts the car guide rail 11, the working wedge 47 is displaced upward relative to the movable guide member 44 along the guide surface 44a by means of the frictional force acting between the working wedge 47 and the car guide rail 11. As a result, the movable guide member 44 is pushed back to its normal position against the multiple working springs 45.

[0082] Figure 8 It is shown Figure 7 The front view of the working wedge 47 after it has been further moved upward relative to the movable guide member 44. After the movable guide member 44 returns to its normal position, when the working wedge 47 is further moved upward relative to the movable guide member 44, the lateral moving frame 42 moves in the direction where the braking member 48 contacts the car guide rail 11.

[0083] After the braking component 48 contacts the car guide rail 11, when the working wedge 47 moves to the upper end of the guide surface 44a, the lateral moving frame 42 moves to the second horizontal position, and the multiple return springs 43 and multiple main springs 49 are compressed respectively. As a result, the car guide rail 11 is clamped between the working wedge 47 and the braking component 48.

[0084] Figure 9 It shows that the car 9 is from Figure 8 A front view of the emergency stop device 30 in its state during descent. When the car 9 descends... Figure 8 When the state is lowered, the lifting frame 41 moves upward from the non-rising position to the lifting position. As a result, the horizontally moving frame 42 also moves upward, and the lifting rod 32 is lifted.

[0085] Thus, by moving the movable guide member 44 to the working position, the working wedge 47 contacts the car guide rail 11 and moves upward relative to the movable guide member 44 along the guide surface 44a, while the lateral moving frame 42 moves horizontally relative to the lifting frame 41. As a result, the car guide rail 11 is clamped between the working wedge 47 and the braking member 48, the multiple main springs 49 are compressed, and the lifting frame 41 moves to the lifting position.

[0086] Figure 10 It shows that it was mentioned Figure 2 The front view shows the state of the lifting rod 32. When the lifting rod 32 is lifted, the working rod 21 and the linkage rod 22 rotate respectively, and the emergency stop device 20 is activated. As a result, the car 9 comes to an emergency stop.

[0087] 4-2. Reset Action

[0088] Next, the reset operation of the emergency stop device 20 and the emergency stop working device 30 after the emergency stop of the car 9 will be explained. The reset operation is used to return the emergency stop device 20 and the emergency stop working device 30 to their standby state before the emergency stop. When the emergency stop device 20 and the emergency stop working device 30 are reset, the actuator 46 is energized, holding the movable guide member 44 in its normal position. Next, the car 9 is moved from the traction machine 3... Figure 10 The state is rising.

[0089] Figure 11 It is shown Figure 9 The front view shows the state immediately after the emergency stop device 30 has just begun its reset action. Because the working wedge 47 and the braking component 48 clamp the car guide rail 11, the lateral moving frame 42 descends relative to the fixed frame 40 and the car 9 as the fixed frame 40 rises due to the rise of the car 9.

[0090] Therefore, the lifting rod 32 descends relative to the car 9, and the working rod 21 moves along... Figure 10 Rotate clockwise, and linkage 22 along Figure 10 Rotate counterclockwise.

[0091] Figure 12 It is shown Figure 11 A front view of the emergency stop device 30 in its state when the car 9 rises further. When the car 9 rises further, the lifting frame 41 returns to the non-rising position, and the working lever 21 and the linkage lever 22 return to their original positions. Figure 2 At the position shown, a pair of wedge components 27 from Figure 4 Status return Figure 3 The state.

[0092] Figure 13 It is shown Figure 12 The main view of the state after the working wedge 47 has been shifted downwards. When the car 9... Figure 12 When the state rises further, a gap is generated between the working wedge 47 and the car guide rail 11, and the working wedge 47 falls along the guide surface 44a.

[0093] As a result, each reset spring 43 resets, the lateral moving frame 42 returns to the first horizontal position, and the braking component 48 leaves the car guide rail 11.

[0094] 4-3. Starting Action

[0095] Next, the activation actions of the emergency stop device 20 and the emergency stop working device 30 will be explained. The activation action is used to set the emergency stop device 20 and the emergency stop working device 30 to a standby state when the elevator starts.

[0096] Figure 14 This is a front view showing the state of the emergency stop device 30 immediately after the elevator starts. When the elevator starts, the frame 41 is in a non-ascending position; therefore, the positions of the working rod 21 and the linkage rod 22 are... Figure 2 At the position shown, the pair of wedge components 27 are in the following state: Figure 3 The movable guide member 44 is moved to the working position by means of the force of multiple working springs 45, and the working wedge 47 contacts the car guide rail 11. During the start-up operation, the actuator 46 is energized, but the actuator 46 cannot generate a force to move the movable guide member 44 from the working position to the normal position. Therefore, the positions of the movable guide member 44 and the working wedge 47 do not change.

[0097] Figure 15 It is shown Figure 14 The front view of the working wedge 47 after it has been moved upward relative to the movable guide member 44. When in Figure 14When the car 9 is lowered in the specified state, the working wedge 47 is displaced upward relative to the movable guide member 44 along the guide surface 44a by means of the frictional force acting between the working wedge 47 and the car guide rail 11. As a result, the movable guide member 44 is pushed back towards the normal position against the multiple working springs 45 and held in the normal position by the actuator 46.

[0098] Figure 16 It is shown Figure 15 The main view of the state after the working wedge 47 has been shifted downwards. When from... Figure 15 When the car 9 rises, a gap is created between the working wedge 47 and the car guide rail 11, and the working wedge 47 falls along the guide surface 44a. As a result, the emergency stop device 20 and the emergency stop working device 30 are set to standby mode.

[0099] In such an elevator emergency stop device 30, a movable guide member 44, multiple working springs 45, an actuator 46, a working wedge 47, a braking member 48, and a main spring 49 are disposed in a transverse moving frame 42. Moreover, the transverse moving frame 42 is capable of shifting in the horizontal direction.

[0100] Therefore, during the reset operation, by raising the car 9, the working wedge 47 can be lowered, the lateral moving frame 42 can be returned to the first horizontal position, and the braking component 48 can be disengaged from the car guide rail 11. As a result, the required driving force and range of motion of the actuator 46 can be reduced, and the actuator 46 can be miniaturized.

[0101] Furthermore, the lateral moving frame 42 can be moved horizontally, so the emergency stop device 20 can operate stably even if there is a deviation in the distance between the normal position and the working position.

[0102] Furthermore, a fixed frame 40 is provided in the car 9. The fixed frame 40 guides the lifting frame 41 to move in the vertical direction. Therefore, the lifting frame 41 can be stably moved between the non-rising position and the lifting position, and the emergency stop device 20 can operate stably.

[0103] Furthermore, during the start-up operation, by lowering the car 9, the working wedge 47 can be moved upward relative to the movable guide member 44 along the guide surface 44a by the frictional force acting between the working wedge 47 and the car guide rail 11, thereby pushing the movable guide member 44 back to its normal position. As a result, the driving force and range of motion required by the actuator 46 can be reduced.

[0104] 5. Features of the security system in the implementation method

[0105] Sometimes, due to component deterioration or oil adhering to the car guide rail 11, the friction between the working wedge 47 and the car guide rail 11 may decrease in the emergency stop device 30. In this case, the descent distance of the car 9 required for the starting action may be prolonged, or the device may fail to start. If this condition is left unchecked, the device may deteriorate further; therefore, it is necessary to detect and take countermeasures as early as possible.

[0106] The safety system of this embodiment is characterized by detecting abnormal actions during the startup process. The structure and operation of the safety system will be described below.

[0107] Figure 17 This diagram illustrates the structure of an elevator safety system according to an embodiment. As the main structure, the safety system includes a position detection device 52, an operating status detection device 50, a car movement detection device 13, a safety monitoring device 6, an elevator control device 5, an emergency stop device 30, and an emergency stop device 20. As a functional block for processing various functions, the safety monitoring device 6 includes a power control unit 61, a movement distance calculation unit 62, a position detection unit 63, an anomaly determination unit 64, and a signal output unit 65.

[0108] The power control unit 61 is a functional block for controlling the power supplied to the actuator 46 of the emergency stop device 30.

[0109] The travel distance calculation unit 62 is a function block used to calculate the travel distance of the car 9 based on the detection signal output from the car travel amount detection device 13. Hereinafter, this process is referred to as "travel distance calculation process".

[0110] The position detection unit 63 is a functional block used to detect the displacement of the movable guide member 44 to its normal position based on the detection signal output from the position detection device 52. Hereinafter, this process is referred to as "position detection process".

[0111] The anomaly determination unit 64 is a function block used to determine whether there is an operational anomaly during the start-up operation. Typically, if the downward movement distance of the car 9 exceeds a threshold during the start-up operation, the anomaly determination unit 64 determines that there is an operational anomaly. Hereinafter, this process is referred to as "anomaly determination processing". The threshold here is a boundary value of the allowable downward movement distance of the car 9 during the start-up operation, and a predetermined value is used.

[0112] The signal output unit 65 is a function block for outputting various signals. Examples of signals output from the signal output unit 65 include an abnormality detection signal indicating an operational malfunction during startup, a signal indicating the movement of the car 9, and a signal for supplying power to the actuator 46.

[0113] The safety monitoring device 6 determines whether there are any abnormal actions during the startup process by performing a startup action according to the following flowchart. Figure 18 This is a flowchart illustrating the control routine for the startup action executed in the safety system of the embodiment. Figure 18 The routine shown is executed by safety monitoring device 6 when the elevator starts.

[0114] In step S100, it is determined whether the emergency stop device 20 is detected to be in a non-operating state. Here, it is determined whether an OFF signal indicating that the emergency stop device 20 is in a non-operating state has been sent from the operating state detection device 50. As a result, if the emergency stop device 20 is in a non-operating state, it is determined that the elevator is in the process of starting, and the process proceeds to step S102. On the other hand, if the emergency stop device 20 is in an operating state, it is determined that it is not the normal state for starting, and the process proceeds to step S116.

[0115] In step S102, power is supplied to the actuator 46 in the power control unit 61, and the process proceeds to step S104. In step S104, the travel distance calculation unit 62 begins the travel distance calculation process, calculating the travel distance of the car 9 from the current moment. After step S104 is completed, the process proceeds to step S106.

[0116] In step S106, the elevator control device 5 is output a command to cause the car 9 to descend at a slow speed for a specified distance. Upon receiving the command, the elevator control device 5 controls the traction machine 3 to lower the car 9. After step S106 is completed, the process proceeds to step S108.

[0117] In step S108, position detection processing is performed in the position detection unit 63 to determine whether the movable guide member 44 has moved to its normal position. As a result, if the determination is true, the process proceeds to step S112; if the determination is false, the process proceeds to step S110.

[0118] In step S110, anomaly determination processing is performed in the anomaly determination unit 64 to determine whether the movement distance calculated by the movement distance calculation process exceeds a threshold. If the determination is successful, an abnormal action is identified, and the process proceeds to step S116. In step S116, an anomaly detection signal is output to the elevator control device 5 from the signal output unit 65. Upon receiving the anomaly detection signal, the elevator control device 5 controls the brake of the traction machine 3 to bring the car 9 to an emergency stop. When step S116 is completed, the process of this routine ends. On the other hand, if the determination in step S110 is unsuccessful, the process returns to step S106.

[0119] In step S112, an instruction is output to the elevator control device 5 to cause the car 9 to rise at a slight speed for a specified distance. Upon receiving the instruction, the elevator control device 5 controls the traction machine 3 to raise the car 9. This creates a gap between the working wedge 47 and the car guide rail 11, causing the working wedge 47 to fall along the guide surface 44a. Consequently, the emergency stop device 20 and the emergency stop working device 30 are set to standby mode. After step S112 is completed, the process proceeds to step S114. In step S114, a start-up completion signal, indicating the completion of the start-up action, is output to the elevator control device 5. Upon receiving the start-up completion signal, the elevator control device 5 begins normal operation. The process ends after step S114 is completed.

[0120] Based on the above starting action, abnormalities in the starting action can be detected, causing the car 9 to stop urgently. This prevents deterioration of the emergency stop device 30, and furthermore, the starting action can be completed without the presence of an operator.

[0121] 6. Variations in the implementation method

[0122] The elevator safety system described in the implementation can also be applied in the following variations.

[0123] 6-1. Hardware Resources of Security Monitoring Device 6

[0124] Figure 19 This diagram illustrates an example of the hardware resources of a security monitoring device. As hardware resources, the security monitoring device 6 has a processing circuit 74, which includes 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.

[0125] In this embodiment, the functions of the security monitoring device 6 can be implemented by software, firmware, or a combination of software and firmware described as a program. This program is stored in the memory 72. The security monitoring device 6 implements its functions by having the processor 70 (computer) execute the program stored in the memory 72.

[0126] 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 can also be a semiconductor memory, magnetic disk, floppy disk, optical disk, compact disk, mini-disk, or DVD. Suitable semiconductor memories include RAM, ROM, flash memory, EPROM, and EEPROM.

[0127] Figure 20 This diagram illustrates another example of the hardware resources required for a security monitoring device.Figure 20 In the example shown, the security monitoring device 6 has, for example, a processing circuit 78 that includes a processor 70, a memory 72, and dedicated hardware 76. Figure 20 An example is shown of a portion of the functions of the security monitoring device 6 implemented by dedicated hardware 76. All the functions of the security monitoring device 6 can also be implemented by dedicated hardware 76. The dedicated hardware 76 can be a single circuit, a composite circuit, a programmable processor, a parallel programmable processor, an ASIC, an FPGA, or a combination thereof.

[0128] 6-2. Position detection device 52

[0129] The position detection device 52 only needs to be configured to detect the movable guide member 44 moving to the normal position, and its configuration and the structure of the detection unit are not limited.

[0130] 6-3. Working status detection device 50

[0131] The working status detection device 50 only needs to be configured to detect whether the emergency stop device 20 is in a working state or a non-working state, and its configuration and the structure of the detection unit are not limited.

[0132] 6-4. Safety monitoring device 6

[0133] In addition, the safety monitoring device 6 can also monitor only either the excessive speed of the car 9 or the excessive acceleration of the car 9.

[0134] The processing performed by the safety monitoring device 6 can also be part or all of the processing performed by the elevator control device 5.

[0135] exist Figure 18 The slow descent command output in step S106 of the example shown can also be a command to continue driving without determining the travel distance to the specified distance. In this case, if the exception determination process in step S110 does not confirm that the determination is valid, the process can proceed to step S108.

[0136] 6-5. Emergency stop device 30

[0137] The connection point of the lifting rod 32 relative to the main body 31 of the working device is not limited to the lateral moving frame 42. For example, the upper end of the lifting rod 32 may also be rotatably connected to the movable guide member 44. Alternatively, the upper end of the lifting rod 32 may also be rotatably connected to the braking member 48.

[0138] 6-6. Elevator

[0139] The overall layout of the elevator is not limited to Figure 1The layout. For example, the rope winding method can also be a 2:1 rope winding method.

[0140] In addition, elevators can also be machine-room-less elevators, double-decker elevators, and single-shaft multi-car elevators. A single-shaft multi-car elevator is one in which the upper car and the lower car, located directly below the upper car, move independently up and down in a common shaft.

[0141] 7. Other

[0142] The preferred embodiments have been described in detail above. However, this disclosure is not limited to the embodiments described above, and various modifications and substitutions can be made to the embodiments described above without departing from the scope of the claims.

[0143] The following is a summary of the various methods disclosed herein.

[0144] (Postscript 1)

[0145] An elevator safety system, wherein the elevator safety system has:

[0146] An emergency stop device that brings the elevator car to an emergency stop as it moves up and down the guide rails.

[0147] An emergency stop device comprising: a movable guide member capable of shifting between a working position and a normal position; a working spring applying a force to the movable guide member toward the working position; and an actuator receiving a power supply and resisting the working spring to hold the movable guide member in the normal position, wherein the emergency stop device is activated when the power supply to the actuator is cut off and the movable guide member shifts to the working position; and

[0148] The safety monitoring device, upon detecting abnormal movement of the car, cuts off the power supply to the actuator.

[0149] When the elevator starts, the emergency stop device is configured to move the movable guide member from the working position to the normal position based on the force received from the guide rail by the starting action involving the descent of the car.

[0150] The safety monitoring device is configured to output an abnormality detection signal if the descent distance of the car exceeds a threshold during the period until the movable guide member is moved to the normal position by the actuation action.

[0151] (Postscript 2)

[0152] According to the elevator safety system described in Appendix 1, wherein...

[0153] When the elevator starts, the safety monitoring device is configured to supply power to the actuator.

[0154] (Note 3)

[0155] According to Appendix 1 or 2, the elevator safety system has the following features:

[0156] A driving control device that controls the movement of the car according to action commands output from the safety monitoring device; and

[0157] A position detection device that detects the normal state of the movable guide component shifting to the normal position.

[0158] When the elevator starts, the safety monitoring device is configured to output a command to the travel control device to lower the car during the period until the position detection device detects the normal state, and to output a command to the travel control device to temporarily raise the car and then stop it when the position detection device detects the normal state.

[0159] (Note 4)

[0160] According to the elevator safety system described in Appendix 3, wherein...

[0161] The driving control device is configured to bring the car to an emergency stop upon receiving the abnormality detection signal.

[0162] (Note 5)

[0163] The elevator safety system according to any one of Appendices 1 to 3, wherein...

[0164] The safety monitoring device is configured to detect the abnormal movement of the car when the car's speed or acceleration reaches a predetermined value.

[0165] (Note 6)

[0166] The elevator safety system according to any one of Appendices 1 to 5, wherein,

[0167] The emergency stop device has the following features:

[0168] The frame is lifted so that it can move vertically between a non-rising position and a lifted position, which is a position above the non-rising position, and move from the non-rising position to the lifted position.

[0169] A transfer mechanism that transfers the vertical displacement of the lifting frame relative to the car to the emergency stop device, thereby activating the emergency stop device;

[0170] A laterally movable frame, which is disposed on the lifting frame in a manner that allows it to shift horizontally relative to the lifting frame between a first horizontal position and a second horizontal position; and

[0171] A return spring, disposed between the lifting frame and the lateral moving frame, generates a force that returns the lateral moving frame to the first horizontal position.

[0172] The movable guide member has a guide surface that faces the guide rail and is inclined relative to the guide rail as it moves upward. The movable guide member is disposed in the lateral moving frame such that it can be horizontally displaced relative to the lateral moving frame between the normal position and the working position.

[0173] The working spring is disposed between the lateral moving frame and the movable guide component.

[0174] The emergency stop device has the following features:

[0175] A working wedge is disposed between the movable guide member and the guide rail, and can be moved in the vertical direction relative to the movable guide member along the guide surface;

[0176] A braking component, disposed in the laterally movable frame, and positioned opposite the guide rail on the side opposite to the movable guide component; and

[0177] The main spring is disposed between the lateral moving frame and the braking component.

[0178] The emergency stop device is configured such that the movable guide member moves to the working position, the working wedge contacts the guide rail and moves upward relative to the movable guide member along the guide surface, the lateral moving frame moves horizontally relative to the lifting frame, the guide rail is clamped between the working wedge and the braking member, the main spring is compressed, and the lifting frame moves to the lifting position.

[0179] (Note 7)

[0180] According to the elevator safety system described in Appendix 6, wherein...

[0181] The elevator's safety system also includes a fixed frame, which is installed in the car and guides the lifting frame to move in the vertical direction.

[0182] (Postscript 8)

[0183] According to the elevator safety system described in Appendix 6 or 7, wherein...

[0184] The transmission mechanism is connected between the lateral moving frame and the emergency stop device.

Claims

1. A safety system for an elevator, wherein, The elevator's safety system has the following features: An emergency stop device that brings the elevator car to an emergency stop as it moves up and down the guide rails. An emergency stop device comprising: a movable guide member capable of shifting between a working position and a normal position; and a working spring that applies a force to the movable guide member toward the working position. And an actuator that receives a power supply and resists the working spring to hold the movable guide member in the normal position, and when the power supply to the actuator is cut off and the movable guide member is moved to the working position, the emergency stop device activates the emergency stop device. as well as The safety monitoring device, upon detecting abnormal movement of the car, cuts off the power supply to the actuator. When the elevator starts, the emergency stop device is configured to move the movable guide member from the working position to the normal position based on the force received from the guide rail by the starting action involving the descent of the car. The safety monitoring device is configured to output an abnormality detection signal if the descent distance of the car exceeds a threshold during the period until the movable guide member is moved to the normal position by the actuation action.

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

3. The elevator safety system according to claim 1 or 2, wherein, The elevator's safety system has the following features: A driving control device that controls the movement of the car according to the action commands output from the safety monitoring device; as well as A position detection device that detects the normal state of the movable guide component shifting to the normal position. When the elevator starts, the safety monitoring device is configured to output a command to the travel control device to lower the car during the period until the position detection device detects the normal state, and to output a command to the travel control device to temporarily raise the car and then stop it when the position detection device detects the normal state.

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

5. The elevator safety system according to claim 1 or 2, wherein, The safety monitoring device is configured to detect the abnormal movement of the car when the car's speed or acceleration reaches a predetermined value.

6. The elevator safety system according to claim 1 or 2, wherein, The emergency stop device has the following features: The frame is lifted so that it can move vertically between a non-rising position and a lifted position, which is a position above the non-rising position, and move from the non-rising position to the lifted position. A transfer mechanism that transfers the vertical displacement of the lifting frame relative to the car to the emergency stop device, thereby activating the emergency stop device; A laterally movable frame is disposed on the lifting frame in such a way that it can be shifted horizontally relative to the lifting frame between a first horizontal position and a second horizontal position; as well as A return spring, disposed between the lifting frame and the lateral moving frame, generates a force that returns the lateral moving frame to the first horizontal position. The movable guide member has a guide surface that faces the guide rail and is inclined relative to the guide rail as it moves upward. The movable guide member is disposed in the lateral moving frame such that it can be horizontally displaced relative to the lateral moving frame between the normal position and the working position. The working spring is disposed between the lateral moving frame and the movable guide component. The emergency stop device has the following features: A working wedge is disposed between the movable guide member and the guide rail, and can be moved in the vertical direction relative to the movable guide member along the guide surface; A braking component is disposed in the lateral moving frame and is opposite to the guide rail on the side opposite to the movable guide component. as well as The main spring is disposed between the lateral moving frame and the braking component. The emergency stop device is configured such that the movable guide member moves to the working position, the working wedge contacts the guide rail and moves upward relative to the movable guide member along the guide surface, the lateral moving frame moves horizontally relative to the lifting frame, the guide rail is clamped between the working wedge and the braking member, the main spring is compressed, and the lifting frame moves to the lifting position.

7. The elevator safety system according to claim 6, wherein, The elevator's safety system also includes a fixed frame, which is installed in the car and guides the lifting frame to move in the vertical direction.

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

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