Elevator terminal floor forced deceleration device

Abstract

Disclosed is a terminal floor forced deceleration device for an elevator with which the speed of the impact of a car with a buffer can be reduced even while braking the car by means of a mechanical brake during an emergency stop. The terminal floor forced deceleration device is configured so that, if the speed of a car (1) of an elevator provided with a buffer (300) at a bottom part of a shaft exceeds a prescribed excessive speed threshold that is set according to the position of the car, the supply of power to a hoisting machine (4) is cut and a brake device is operated to decelerate the car. The terminal floor forced deceleration device comprises: an emergency stop device (200) that is provided to the car; an electric operation apparatus (10) that is provided to the car, and that operates the emergency stop device; and a safety control device (100) that operates the electric operation apparatus. The safety control device operates the electric operation apparatus according to the deceleration of the car.

Description

[Technical Field]

[0001] This invention relates to an elevator terminal floor forced deceleration device that slows down the elevator car using a braking device in an emergency. [Background technology]

[0002] At the bottom of the elevator shaft, a buffer is installed as a safety device, corresponding to the elevator's rated speed. As the rated speed increases, the length of the buffer increases. Consequently, the depth of the pit in the elevator shaft increases.

[0003] The length of the buffer can be reduced by suppressing the speed at which the elevator car collides with the buffer during an emergency stop. This collision speed of the elevator car is suppressed by a terminal floor forced deceleration device that forcibly stops the elevator car at the lowest floor, i.e., the terminal floor, if an abnormality occurs in the elevator car's deceleration control.

[0004] Regarding prior art related to terminal floor forced deceleration devices, the technology described in Patent Document 1 is known.

[0005] This conventional elevator system includes means for setting a first set speed which varies depending on the position of the elevator car in the hoistway, means for setting a second set speed which is greater than the first set speed and varies depending on the position of the elevator car in the hoistway, a mechanical brake which operates when the elevator car speed exceeds the first set speed, and an emergency stop device which operates when the elevator car speed exceeds the second set speed.

[0006] If an abnormality occurs while the elevator car is descending, causing it to overspeed, and the car's speed exceeds the first set speed near the lowest floor, the mechanical brakes will engage. This will slow the car down, thus reducing its collision speed with the buffer. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] International Publication No. 2004 / 031064 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] In the conventional technology described above, the magnitude of the collision speed depends on the braking force of the mechanical brake. Therefore, considering fluctuations in braking force due to aging and other factors, the collision speed that the buffer must handle becomes larger.

[0009] Therefore, the present invention provides an elevator terminal floor forced deceleration device that can reduce the collision speed of the elevator car with the buffer while braking the elevator car with a mechanical brake during an emergency stop. [Means for solving the problem]

[0010] To solve the above problems, the elevator terminal floor forced deceleration device according to the present invention, when the speed of the elevator car, which has a buffer at the bottom of the hoistway, exceeds a predetermined overspeed threshold set according to the position of the car, cuts off the power supply to the hoisting machine and activates a braking device to decelerate the car, and comprises an emergency stop device provided on the car, an electric operator provided on the car for operating the emergency stop device, and a safety control device for operating the electric operator, the safety control device is The vehicle is slowed down by activating the braking system. The electric control unit is activated according to the deceleration of the elevator car. [Effects of the Invention]

[0011] According to the present invention, the collision speed of the elevator car with the buffer can be reduced while the elevator car is being braked by mechanical brakes during an emergency stop.

[0012] Other issues, configurations, and effects not mentioned above will be clarified by the following description of the embodiments. [Brief explanation of the drawing]

[0013] [Figure 1] It is a configuration diagram showing the overall configuration of the elevator which is an embodiment. [Figure 2] It is a front view showing the mechanism housed in the housing of the electric operator in the embodiment. The electric operator is in a standby state. [Figure 3] It is a front view showing the mechanism housed in the housing of the electric operator in the embodiment. The electric operator is in an operating state. [Figure 4] It is a functional block diagram showing the configuration of the safety controller in the embodiment. [Figure 5] It is a flowchart showing the processing operation of the safety controller in the embodiment. [Figure 6] It is a graph showing an example of the relationship between the speed and position of the car in the embodiment.

Modes for Carrying Out the Invention

[0014] Hereinafter, embodiments of the present invention will be described with reference to the drawings according to the following examples.

[0015] In each figure, those with the same reference numerals indicate the same constituent elements or constituent elements having similar functions.

[0016] FIG. 1 is a configuration diagram showing the overall configuration of the elevator which is an embodiment of the present invention.

[0017] As shown in FIG. 1, in the embodiment, the car 1 and the counterweight 2 are mechanically connected to one end and the other end of the main rope 3, respectively. The main rope 3 is wound around a sheave provided in the hoisting machine 4. Thereby, the car 1 and the counterweight 2 are suspended in a hoistway provided in a building. That is, the embodiment is a so-called pulley-type elevator. In the embodiment, the hoisting machine 4 is installed in a machine room provided on the hoistway. Further, a buffer 300 is provided at the bottom of the hoistway as a safety device.

[0018] When the motor in the hoisting machine 4 rotates and the sheave is driven to rotate, the main rope 3 is driven linearly by the frictional force between the sheave and the main rope 3. As a result, the elevator car 1 and the counterweight 2 move in opposite directions within the hoistway.

[0019] The elevator car 1 is movably engaged with the guide rail 5 via a guide device (e.g., a guide shoe) not shown. Therefore, the elevator car 1 moves between any floor between the lowest floor FL1 and other floors (such as FL2) while being guided by the guide rail 5. In this embodiment, a general T-shaped guide rail is used as the guide rail 5. The counterweight 2 also moves while being guided by a counterweight guide rail not shown.

[0020] The normal operation of elevator car 1 is controlled by an elevator control device 6 installed in the machine room together with the hoisting machine 4. The hoisting machine 4 is equipped with an AC motor such as a synchronous motor. The speed and position of elevator car 1 are controlled by the inverter device of the elevator control device 6, which drives this AC motor. The elevator control device 6 controls the operation of elevator car 1 based on detection signals from a rotation detector (e.g., a rotary encoder, not shown) that detects the rotation of the hoisting machine 4, and detection signals from a position detection device that detects the position of elevator car 1 in the hoistway.

[0021] The position detection device consists, for example, of a shielding plate fixed inside the elevator shaft and a photoelectric sensor installed in the elevator car 1.

[0022] The hoisting machine 4 is equipped with an electromagnetic brake device (not shown) as a braking device. When the elevator car 1 is decelerated by the elevator control device 6 toward the stopping floor and lands at the stopping floor, the elevator control device 6 transitions the electromagnetic brake device from the open state to the braking state. This maintains the stopped state of the elevator car 1.

[0023] A safety control device (100) (hereinafter referred to as "safety controller 100") is installed on top of the elevator car 1. The safety controller 100 has the function of controlling the emergency stop device 200 installed on the elevator car 1 and the electromagnetic brake device provided on the hoisting machine 4 to bring the elevator car 1 to an emergency stop or to forcibly decelerate the elevator car 1 near the lowest floor FL1, i.e., the terminal floor.

[0024] The safety controller 100 is electrically connected to a position sensor 50 installed on top of the elevator car 1. In this embodiment, the position sensor 50 is composed of an image sensor (for example, a CCD or CMOS sensor). The position sensor 50 acquires a surface image of the guide rail 5, which is a stationary object in the elevator shaft. In this embodiment, the surface image of the tip of the T-shaped base of the guide rail 5 is acquired. The safety controller 100 measures the position and speed of the elevator car 1 based on the surface image of the guide rail 5 acquired by the image sensor 9.

[0025] The safety controller 100 and the elevator control device 6 are electrically connected via a tail code 7, enabling communication and power supply to the safety controller 100.

[0026] If the safety controller 100 determines, based on the detection signal from the position sensor 50, that the elevator car 1 is in an overspeed state, it activates the electromagnetic brake device or emergency stop device 200 provided by the hoisting machine 4 to bring the elevator car 1 to an emergency stop.

[0027] The safety controller 100 activates the emergency stop device 200 by operating the electric actuator 10, thereby raising the lifting rod 21. In this embodiment, the emergency stop device 200 is a known emergency stop device having a wedge-shaped brake.

[0028] In this embodiment, the electric control unit 10 is an electromagnetic control unit and is located on top of the elevator car 1. The electromagnetic control unit includes, for example, a movable piece or movable rod that is actuated by a solenoid or electromagnet. The electric control unit 10 is activated when the position sensor 50 detects a predetermined overspeed state of the elevator car 1. At this time, the lifting rod 21 is raised by the drive mechanism (12, 16, 17, 18, etc.) connected to the operating lever 11. This causes the emergency stop device 200 to enter a braking state.

[0029] The emergency stop devices 200 are positioned one on each side of the elevator car 1. Each emergency stop device 200 has a pair of brakes (not shown) that are movable between a braking position and a non-braking position. In the braking position, they grip the guide rail 5, and as the elevator car 1 descends, they rise relatively, generating a braking force due to the frictional force acting between the brakes and the guide rail 5. As a result, the emergency stop devices 200 activate when the elevator car 1 becomes overspeedy, bringing the elevator car 1 to an emergency stop.

[0030] The elevator in this embodiment is equipped with a so-called ropeless governor system that does not use a governor rope. When the lifting speed of the elevator car 1 exceeds the rated speed and reaches a first overspeed (for example, a speed not exceeding 1.3 times the rated speed), the power supply to the hoisting machine 4 and the power supply to the elevator control device 6 that controls this drive device are shut off. Also, when the lowering speed of the elevator car 1 reaches a second overspeed (for example, a speed not exceeding 1.4 times the rated speed), the electric actuator 10 installed on the elevator car 1 is electrically driven, activating the emergency stop device 200, and the elevator car 1 is brought to an emergency stop.

[0031] In this embodiment, the ropeless governor system consists of the aforementioned position sensor 50 and a safety controller 100 that determines the overspeed state of the elevator car 1 based on the detection signal from the position sensor 50. The safety controller 100 measures the speed of the elevator car 1 based on the output signal from the position sensor 50, and when it determines that the measured speed has reached a first overspeed, it outputs a command signal to shut off the power supply to the hoisting machine 4 and the power supply to the elevator control device 6 that controls the hoisting machine 4. Furthermore, when the safety controller 100 determines that the measured speed has reached a second overspeed, it outputs a command signal to activate the electric actuator 10.

[0032] When the pair of brakes of the emergency stop device 200 are raised by the lifting rod 21, the pair of brakes grip the guide rail 5. The lifting rod 21 is driven by the electric operator 10.

[0033] The configuration and operation of the electric actuator 10 will be described below. The explanation will be given with reference to Figure 1, but for details not shown in Figure 1, please refer to Figure 2 as appropriate.

[0034] As shown in Figure 1, the operating lever 11 and the first actuation piece 16 are connected to form a roughly T-shaped first link member. The operating lever 11 and the first actuation piece 16 constitute the head and foot of the T, respectively. The roughly T-shaped first link member is rotatably supported by a crosshead (not shown) at the connection point between the operating lever 11 and the first actuation piece 16. One end (left side in the figure) of a pair of lifting rods 21 is connected to the end of the first actuation piece 16 that forms the foot of the T, opposite to the connection point between the operating lever 11 and the first actuation piece 16.

[0035] The connecting piece 17 and the second operating piece 18 are connected to form a substantially T-shaped second link member. The connecting piece 17 and the second operating piece 18 constitute the head and foot of the T, respectively. The substantially T-shaped second link member is rotatably supported by a crosshead (not shown) at the connection point between the connecting piece 17 and the second operating piece 18. The other end (left side in the figure) of the pair of lifting rods 21 is connected to the end of the second operating piece 18 that forms the foot of the T, opposite to the connection point between the connecting piece 17 and the second operating piece 18.

[0036] The end of the operating lever 11, which extends from the inside to the outside of the housing (reference numeral 30 in Figure 2), and the ends of the connecting piece 17, specifically the ends closer to the top of the elevator car 1, are connected to one end (left in the figure) and the other end (right in the figure) of the drive shaft 12, which lies on top of the elevator car 1. The drive shaft 12 slides through a fixed part (reference numeral 14 in Figure 2) that is fixed to the crosshead. The drive shaft 12 also passes through a pressing member (reference numeral 15 in Figure 2), and the pressing member is fixed to the drive shaft 12. The pressing member 15 (Figure 2) is located on the side of the fixed part that is connected to the second link member (connecting piece 17, second operating piece 18). An elastic drive spring (reference numeral 13 in Figure 2) is located between the fixed part 14 (Figure 2) and the pressing member 15 (Figure 2), and the drive shaft 12 is inserted through the drive spring 13 (Figure 2).

[0037] When the electric actuator 10 is activated, that is, in this embodiment, when the power supply to the electromagnet is cut off, the electromagnetic force that restrains the movement of the operating lever 11 against the biasing force of the drive spring 13 (Figure 2) disappears. As a result, the biasing force of the drive spring 13 (Figure 2) applied to the pressing member 15 (Figure 2) drives the drive shaft 12 along its longitudinal direction. Consequently, the first link member (operating lever 11, first operating piece 16) rotates, and the second link member (connecting piece 17, second operating piece 18) also rotates. This drives one of the lifting rods 21 connected to the first operating piece 16 of the first link member up, and drives the other lifting rod 21 connected to the second operating piece 18 of the second link member up.

[0038] Figure 2 shows the mechanism housed within the housing 30 of the electric operator 10 in the embodiment, and is a front view in the installed state shown in Figure 1. In Figure 2, the emergency stop device 200 (Figure 1) is in a non-operating state, and the electric operator 10 is in a standby state. In other words, the elevator is in a normal operating state.

[0039] As shown in Figure 2, in the standby state, the armature 34 connected to the operating lever 11 is attracted to the energized electromagnet 35. This restricts the movement of the operating lever 11 against the biasing force of the drive spring 13 (compression spring). The operating lever 11 is connected to the armature 34 via a bracket 38 that is rotatably mounted on the armature 34. At least the portion of the armature 34 that attracts the electromagnet 35 is made of a magnetic material.

[0040] Other mechanical parts (36, 37, 40-42) in Figure 2 will be described later (Figure 3).

[0041] In this embodiment, a flexible cover member 32 is provided in the housing cover 31, which is the upper surface of the housing 30, at the opening through which the operating lever 11 is inserted. For example, the cover member 32 is made of a thin sheet of rubber material. Because the cover member 32 is flexible, the movement of the operating lever 11 when activating the emergency stop device is not hindered.

[0042] The cover member 32 prevents dust and foreign matter from entering the housing 30 and adhering to or coming into contact with the mechanism. This improves the reliability of the operation of the electric actuator in the installation environment (such as inside an elevator shaft). Consequently, the reliability of the operation of the emergency stop device is improved.

[0043] In this embodiment, a plate-shaped member 33 is further provided on the operating lever 11. The plate-shaped member 33 is fixed to the connection between the bracket 38 and the operating lever 11. The flat portion of the plate-shaped member 33 is located within the housing 30, in the space directly below and around the opening through which the operating lever 11 is inserted in the housing cover 31, and covers the mechanism located directly below the opening. This prevents dust and foreign matter from adhering to or coming into contact with the mechanism even if dust or foreign matter enters the housing 30. As a result, the reliability of the operation of the electric operating device in the installation environment (such as inside an elevator shaft) is more reliably improved. Consequently, the reliability of the operation of the emergency stop device is more reliably improved.

[0044] Figure 3 shows the mechanism housed within the housing 30 of the electric operator 10 in the embodiment, and is a front view of the installed state as shown in Figure 1. In Figure 3, the emergency stop device 200 (Figure 1) is in the braking state, and the electric operator 10 is in the operating state. That is, the elevator system is stopped by the emergency stop device 200.

[0045] When the excitation of the electromagnet 35 is stopped by a command signal from the safety controller 100, the attractive force acting on the armature 34 disappears, releasing the biasing force of the drive spring 13 and driving the drive shaft 12. When the drive shaft 12 is driven, the operating lever 11 connected to the drive shaft 12 rotates around the first operating shaft 19, and in conjunction with this, the first operating piece 16 connected to the operating lever 11 rotates around the first operating shaft 19. As a result, the lifting rod 21 connected to the first operating piece is lifted.

[0046] As described above, when the operating lever 11 is rotated, the armature 34 connected to the operating lever 11 moves along the direction of rotation of the operating lever 11. In order to return the electric actuator 10 to the standby state as shown in Figure 2, the armature 34 is returned from the moved position (Figure 3) to the standby position (Figure 2) by the mechanism (36, 37, 40-42) which is not explained in Figure 2, as described below.

[0047] As shown in Figure 3, the electric actuator 10 has a lead screw 36 located on the flat surface of the substrate 40 to drive the armature 34. The lead screw is rotatably supported by a first support member 41 and a second support member 42 fixed to the flat surface of the substrate 40. The electromagnet 35 has a nut portion which screws onto the lead screw 36. The lead screw 36 is rotated by a motor 37.

[0048] To return the electric actuator 10 to the standby state, first, the motor 37 is driven to rotate the lead screw while the electromagnet 35 is energized. The rotation of the motor is converted into linear movement of the electromagnet 35 along the axial direction of the lead screw by the rotation of the lead screw and the nut portion of the electromagnet 35. As a result, the electromagnet 35 approaches the position of the armature 34 shown in Figure 3, and the armature 34 is attracted to the electromagnet 35 by the electromagnetic force acting on it. Once the armature 34 is attracted to the electromagnet 35, the rotation direction of the motor 37 is reversed while the electromagnet 35 is continued to be energized, and the lead screw is reversed. As a result, the armature 34 moves together with the electromagnet 35 to the standby position.

[0049] In this embodiment, the plate-shaped member 33 is fixed to the operating lever 11 within the space inside the housing 30, and therefore moves together with the operating lever 11. In other words, the plate-shaped member 33 does not obstruct the movement of the operating lever 11.

[0050] In this embodiment, the plate-shaped member 33 and the operating lever 11 are fitted together without any gaps or tightly connected using adhesive or a bonding material in order to fix the plate-shaped member 33 to the operating lever 11. As a result, the plate-shaped member 33 and the operating lever 11 are connected to each other without any gaps at their connection points. Therefore, the plate-shaped member 33 reliably prevents dust, foreign matter, etc. from adhering to or coming into contact with the mechanism.

[0051] Next, the terminal floor forced deceleration device provided in the elevator of the embodiment will be described.

[0052] In this embodiment, the terminal floor forced deceleration device is comprised of an electromagnetic brake device and a safety controller 100 provided on the hoisting machine 4, and further includes an electric actuator 10 controlled by the safety controller 100 and an emergency stop device 200 activated by the electric actuator 10.

[0053] Figure 4 is a functional block diagram showing the configuration of the safety controller 100 in the embodiment. Figure 4 also shows the functions of the safety controller 100 related to forced deceleration at the terminal floor and emergency stop.

[0054] In this embodiment, the safety controller 100 is comprised of a computer system such as a microcomputer. The computer system functions as a component by executing a predetermined program.

[0055] As shown in Figure 4, the safety controller 100 includes a position detection unit 101, an overspeed threshold calculation unit 102, a first overspeed determination unit 103, a power cut-off unit 104, a speed detection unit 105, a second overspeed determination unit 106, an electric actuator operation unit 107, a deceleration calculation unit 108, and a deceleration determination unit 109.

[0056] The position detection unit 101 detects the position of the elevator car 1 in the height direction of the elevator shaft based on the detection signal output by the position sensor 50 for detecting the position of the elevator car 1.

[0057] In this embodiment, an image sensor is used as the position sensor 50.

[0058] The position detection unit 101 processes images of the exposed surface of the guide rail 5 acquired by the image sensor to detect the position of the elevator car 1. For example, the position detection unit 101 calculates the image displacement Δd at two points in time (time t and time t+Δt: Δt is, for example, the frame period) using the image correlation method. The position detection unit 101 calculates the travel distance d of the elevator car 1 by successively accumulating the Δd calculated for each Δt, and further calculates the position of the elevator car 1 based on the travel distance d.

[0059] The overspeed threshold calculation unit 102 calculates an overspeed threshold, which is the reference speed of the elevator car when the elevator car 1 is brought to an emergency stop by stopping the hoisting machine 4, according to the position of the elevator car 1 detected by the position detection unit 101.

[0060] The overspeed threshold calculation unit 102 calculates the overspeed threshold using a mathematical formula or table data that represents the relationship between the position of the elevator car 1 and the overspeed threshold. For example, the overspeed threshold V th V is the distance L from the position of the elevator car 1 to the top surface of the buffer 300, the magnitude of deceleration a0 (>0: standard value) due to the electromagnetic brake device (not shown) provided by the hoisting machine 4, and the collision velocity V of the elevator car 1 onto the buffer 300. c Using (tolerance value), the formula "V th =(2a0·L+V c 2 ) 1 / 2 It is calculated by ".

[0061] Overspeed threshold V th The calculated value varies depending on the position of the elevator car 1, but the further away from the lowest floor, the larger the calculated value becomes. Therefore, if the calculated value is equal to or greater than the aforementioned first overspeed, the overspeed threshold calculation unit 102 sets the overspeed threshold to the first overspeed. If the calculated value is less than the first overspeed, the overspeed threshold calculation unit 102 sets the overspeed threshold to the calculated value.

[0062] The first overspeed determination unit 103 determines whether the speed of the elevator car 1 detected by the speed detection unit 105 (described later) is greater than the overspeed threshold set by the overspeed threshold calculation unit.

[0063] When the power cut-off unit 104 receives a determination result from the first overspeed determination unit 103 that the speed of the elevator car 1 is greater than the overspeed threshold, it sends a signal to command the power supply from the power source to the hoisting machine 4 to cut off power. As a result, the drive of the hoisting machine 4 stops, and the electromagnetic brake device equipped with the hoisting machine 4 transitions from the open state to the braking state. Therefore, the elevator car 1 comes to an emergency stop.

[0064] In this embodiment, the AC motor of the hoisting machine 4 is driven at a variable speed by AC power from the inverter device. The inverter device is connected to the power supply via an electromagnetic contactor. The inverter device converts the power from the power supply into AC power to drive the AC motor. When the contacts of the electromagnetic contactor are opened by a signal from the power cutoff unit 104, the power supply from the power supply to the inverter device is cut off.

[0065] The speed detection unit 105 detects the speed of the elevator car 1 based on the detection signal output by the position sensor 50.

[0066] The speed detection unit 105 processes images of the exposed surface of the guide rail 5 acquired by the position sensor 50, i.e., the image sensor, to detect the speed of the elevator car 1. For example, the position detection unit 101, similar to the position detection unit, calculates the image displacement Δd at two points in time (time t and time t+Δt: Δt is, for example, the frame period) using the image correlation method. Furthermore, the speed detection unit 105 calculates the speed of the elevator car 1 (=Δd / Δt) using the calculated image displacement Δd.

[0067] The second overspeed determination unit 106 determines whether the speed of the elevator car 1 detected by the speed detection unit 105 is greater than a preset emergency stop activation threshold. The emergency stop activation threshold is equal to the value of the second overspeed described above.

[0068] When the electric control unit 107 receives a determination result from the second overspeed determination unit 106 that the speed of the elevator car 1 is greater than the emergency stop activation threshold, it sends a signal to command the operation of the electric control unit 10. As a result, the electric control unit 10 is activated, and the emergency stop device 200 is activated. Therefore, the elevator car 1 comes to an emergency stop.

[0069] Furthermore, the electric control unit 107 also sends a signal to command the operation of the electric control unit 10 when it receives a determination result from the deceleration determination unit 109, which will be described later.

[0070] The deceleration calculation unit 108 calculates the deceleration of the car 1 based on the speed (v) of the car 1 detected by the speed detection unit 105.

[0071] Assuming that the displacement of the image between times t0 and t1(=t0 + Δt) is Δd1, and the displacement of the image between times t1 and t2(=t1 + Δt) is Δd2, the speed of the car 1 detected by the speed detection unit 105 is Δd1 / Δt(=v1) at time t1 and Δd2 / Δt(=v2) at time t2. The deceleration calculation unit 108 calculates the deceleration a(=(v2 - v1) / Δt=(Δd2 - Δd1) / (Δt) 2 ) based on v1 and v2. Note that the calculated value of a is negative when the car 1 is decelerating and positive when the car 1 is accelerating.

[0072] The deceleration determination unit 109 determines whether the deceleration calculated by the deceleration calculation unit 108 is smaller than a preset threshold value. First, the deceleration determination unit 109 determines whether the deceleration a calculated by the deceleration calculation unit 108 is negative, that is, whether the car 1 is decelerating. If it is decelerating, it determines whether the magnitude of a(<0) (|a| or -a) is smaller than the threshold value a th (>0).

[0073] In the embodiment, the threshold value a th is set to the magnitude of the deceleration, that is, the standard value (the aforementioned a0), before the braking force of the electromagnetic brake device fluctuates due to aging or the like.

[0074] When the electric actuator operating unit 107 receives from the deceleration determination unit 109 a determination result that the magnitude of the deceleration of the car 1 is smaller than the threshold value a th , it sends a signal instructing the operation of the electric actuator 10. As a result, the electric actuator 10 operates, so the emergency stop device 200 operates, and the collision speed of the car 1 with the buffer 300 is suppressed.

[0075] According to the embodiment, if the braking force of the electromagnetic brake device fluctuates due to aging or other reasons, the emergency stop device 200 suppresses the collision speed of the elevator car 1 with the buffer 300. As a result, the buffer 300 only needs to be able to handle the collision speed when a standard deceleration is obtained, without having to provide a margin to account for fluctuations in braking force.

[0076] In the conventional technology described above, the magnitude of the collision speed depends on the braking force of the mechanical brake. Therefore, considering fluctuations in braking force due to aging and other factors, the collision speed that the buffer must handle becomes larger.

[0077] Figure 5 is a flowchart showing the processing operation of the safety controller 100 in the embodiment. The following explanation will refer to Figure 4 as appropriate.

[0078] When the safety controller 100 starts processing, in step S1 it determines whether the elevator car 1 is descending.

[0079] The image acquired by the position sensor 50 shifts downward and upward within the image frame, respectively, according to the upward and downward movement of the elevator car 1. Therefore, by setting a positive or negative sign for the image shift Δd described above according to the direction of the image shift, the upward and downward movement of the elevator car 1 can be determined according to the positive or negative sign of the speed detected by the speed detection unit 105. In this embodiment, the safety controller 100 uses a second overspeed determination unit 106, which receives the speed detected by the speed detection unit 105, to determine whether the elevator car 1 is descending.

[0080] If the safety controller 100 determines that the elevator car is not descending (NO in step S1), it executes step S1 again. If the safety controller 100 determines that the elevator car is descending (YES in step S1), it then executes step S2.

[0081] In step S2, the safety controller 100 uses the second overspeed determination unit 106 to determine whether the speed of the elevator car 1 detected by the speed detection unit 105 is greater than the emergency brake activation threshold (= second overspeed). If the safety controller 100 determines that the speed of the elevator car 1 is greater than the emergency brake activation threshold (YES in step S2), it then executes step S7. If the safety controller 100 determines that the speed of the elevator car 1 is not greater than the emergency brake activation threshold (NO in step S2), it then executes step S3.

[0082] In step S3, the safety controller 100 uses the first overspeed determination unit 103 to determine if the speed of the elevator car 1 detected by the speed detection unit 105 is equal to the overspeed threshold calculated by the overspeed threshold calculation unit 102 (V as described above). th The safety controller 100 determines whether the speed of the elevator car 1 is greater than the overspeed threshold (YES in step S3), then executes step S4. The safety controller 100 determines that the speed of the elevator car 1 is not greater than the overspeed threshold (NO in step S3), then executes step S1 again.

[0083] In step S4, the safety controller 100 uses the power cut-off unit 104 to cut off the power supply from the power source to the hoisting machine 4. After executing step S4, the safety controller 100 then executes step S5.

[0084] In step S5, the safety controller 100 uses the deceleration calculation unit 108 to calculate the deceleration of the elevator car 1 (a above) based on the speed of the elevator car 1 detected by the speed detection unit 105. After executing step S5, the safety controller then executes step S6.

[0085] In step S6, the safety controller 100 uses the deceleration determination unit 109 to determine if the magnitude of the deceleration of the elevator car 1 calculated in step S5 is a predetermined threshold (as described above a thThe safety controller 100 determines whether the deceleration is less than the threshold (YES in step S6). If the safety controller 100 determines that the deceleration is not less than the threshold (NO in step S6), it then executes step S6 again.

[0086] In step S7, the safety controller 100 activates the electric actuator 10 by sending a signal to command the operation of the electric actuator 10 using the electric actuator actuation unit 107. As a result, if the safety controller 100 executes step S7 after step S2, the emergency stop device 200 is activated and the elevator car 1 is brought to an emergency stop. Also, if the safety controller 100 executes step S7 after step S6, the emergency stop device 200 is activated and the elevator car 1 is braked, thereby suppressing the collision speed of the elevator car 1 with the buffer 3001).

[0087] The safety controller terminates the series of processes after executing step S7.

[0088] Figure 6 is a graph showing an example of the relationship between the speed and position of the elevator car 1 in the embodiment. In Figure 6, the speed and position of the elevator car 1 are denoted as "car speed" and "car position," respectively.

[0089] Figure 6 shows the stopping operation of elevator car 1 at the terminal floor, i.e., the lowest floor.

[0090] During normal operation, elevator car 1 slows down towards the lowest floor due to the deceleration control of the electric motor provided by the hoisting machine 4, and stops at the lowest floor.

[0091] In the event of an abnormality, the elevator car 1 will continue to travel without decelerating. Therefore, if the car speed exceeds the overspeed threshold Vth, the safety controller 100 will cut off the power to the hoisting machine 4 (see "Power Cut-off Unit 104" in Figure 4 and step S4 in Figure 5).

[0092] If the deceleration of elevator car 1 is maintained at the standard value (a0 mentioned above), elevator car 1 will reach the top surface of the buffer at a speed below the buffer's allowable collision speed.

[0093] The magnitude of the deceleration of the elevator car 1 is affected by fluctuations in the braking force of the electromagnetic brake device, which is determined by a threshold (as mentioned above a th If the value is less than (=a0), the electric control unit 10 is activated and the emergency stop device 200 is activated, so the elevator car 1 reaches the top surface of the buffer at a speed within the buffer's collision speed tolerance range.

[0094] In contrast, in the comparative example, the emergency braking device is not activated, and the braking force of the electromagnetic brake system suppresses the collision speed of the elevator car against the buffer. Therefore, a buffer with a large collision speed tolerance is applied, taking into account the decrease in deceleration due to fluctuations in the braking force of the electromagnetic brake system.

[0095] In the terminal floor forced deceleration device according to the above embodiment, at the terminal floor (lowest floor), the speed of the elevator car 1 is subject to an overspeed threshold V corresponding to the position of the elevator car 1. th If the speed exceeds a predetermined threshold a, the power supply to the hoisting machine 4 is cut off, and the electromagnetic brake device equipped on the hoisting machine is activated to decelerate the elevator car, and the amount of deceleration of the elevator car is reduced to a predetermined threshold a. th If the value is smaller than (=standard value a0), the electric actuator 10 is activated to operate the emergency stop device 200. This allows the collision speed of the train car with the buffer to be suppressed even if the braking force of the electromagnetic brake system fluctuates due to aging or other reasons, and therefore the allowable collision speed of the buffer can be reduced.

[0096] It should be noted that the present invention is not limited to the embodiments described above, and various modifications are included. For example, the embodiments described above are explained in detail to make the present invention easier to understand, and are not necessarily limited to those having all the configurations described. In addition, some of the configurations in the embodiments can be added, deleted, or replaced with other configurations.

[0097] For example, in addition to an image sensor, the position sensor 50 may also be a rotation detector (e.g., a rotary encoder) installed on the elevator car that rotates with the movement of the elevator car. Alternatively, any sensor capable of detecting the movement of the elevator car, such as a speed sensor, can be used instead of the position sensor 50. When a speed sensor is used, the position detection unit 101 detects the position by integrating the speed.

[0098] The electric control unit 10 may be installed not only on the top of the elevator car 1, but also on the side or bottom of the elevator car 1.

[0099] The elevator may be a so-called machine-room-less elevator, in which the hoisting machine and elevator control device are installed within the hoistway. [Explanation of Symbols]

[0100] 1... elevator car, 2... counterweight, 3... main rope, 4... hoisting machine, 5... guide rail, 6... elevator control device, 7... tail cord, 10... electric operator, 11... operating lever, 12... drive shaft, 13... drive spring, 14... fixed part, 15... pressing member, 16... actuating piece, 17... connecting piece, 18... actuating piece, 19... actuating shaft, 20... actuating shaft, 21... lifting rod, 30... housing, 31... housing cover, 32... cover member, 33... plate-shaped member, 34... armature, 3 5...Electromagnet, 36...Lead screw, 37...Motor, 38...Bracket, 40...Circuit board, 41...Support member, 42...Support member, 50...Position sensor, 100...Safety controller, 101...Position detection unit, 102...Overspeed threshold calculation unit, 103...First overspeed determination unit, 104...Power cut-off unit, 105...Speed ​​detection unit, 106...Second overspeed determination unit, 107...Electric actuator operation unit, 108...Deceleration calculation unit, 109...Deceleration determination unit, 200...Emergency stop device, 300...Buffer

Claims

1. In a terminal floor forced deceleration device that, when the speed of an elevator car with a buffer at the bottom of the hoistway exceeds a predetermined overspeed threshold set according to the position of the elevator car, cuts off the power supply to the hoisting machine and activates a braking device to decelerate the elevator car, An emergency stop device provided in the aforementioned elevator car, An electric control unit is provided in the elevator car for operating the emergency stop device, A safety control device for operating the aforementioned electric operating device, Equipped with, The safety control device is characterized by activating the electric control unit in accordance with the deceleration of the elevator car, which is slowed down by activating the brake device, and is a terminal floor forced deceleration device.

2. In the terminal floor forced deceleration device according to claim 1, The safety control device is characterized by activating the electric actuator when the deceleration is less than a predetermined threshold, thereby enabling forced deceleration at the terminal floor.

3. In the terminal floor forced deceleration device according to claim 2, The aforementioned safety control device is A position detection unit that detects the position of the elevator car based on the detection signal from the motion sensor, A speed detection unit that detects the speed of the elevator car based on the detection signal of the motion sensor, A deceleration calculation unit calculates the deceleration of the elevator car based on the speed of the elevator car detected by the speed detection unit, A deceleration determination unit that determines whether the deceleration calculated by the deceleration calculation unit is less than the predetermined threshold, A terminal floor forced deceleration device characterized by comprising the above.

4. In the terminal floor forced deceleration device according to claim 2, The terminal floor forced deceleration device is characterized in that the predetermined threshold is set to a standard value for the degree of deceleration by the braking device.

5. In the terminal floor forced deceleration device according to claim 1, The aforementioned safety control device is A terminal floor forced deceleration device characterized by comprising an overspeed threshold calculation unit that calculates the overspeed threshold based on the position of the elevator car.

6. In the terminal floor forced deceleration device according to claim 1, The aforementioned safety control device is If the speed of the elevator car exceeds a predetermined first overspeed, the elevator car will be brought to an emergency stop by the braking device. A terminal floor forced deceleration device characterized in that, if the speed of the elevator car exceeds a predetermined second overspeed, the elevator car is brought to an emergency stop by the emergency stop device.

7. In the terminal floor forced deceleration device according to claim 1, The elevator is equipped with an elevator control device that controls the normal operation of the elevator car. The elevator car is characterized in that, during normal operation, it is controlled to decelerate toward the stopping floor by the elevator control device, thus providing a terminal floor forced deceleration device.

8. In the terminal floor forced deceleration device according to claim 1, The terminal floor forced deceleration device is characterized in that the electric operating device comprises an electromagnet and a mechanism that drives the emergency stop device when the electromagnet is demagnetized.

9. In the terminal floor forced deceleration device according to claim 3, The terminal floor forced deceleration device is characterized in that the aforementioned motion sensor is an image sensor.

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