Elevator device and control method of elevator device

Abstract

Disclosed is an elevator apparatus capable of performing a safe operation when a motor-driven operator malfunctions, and a control method for the elevator apparatus. The elevator apparatus includes a car, an emergency stop device provided on the car, a motor-driven operator (10) that operates the emergency stop device, a safety control device (103) that operates the motor-driven operator if an overspeed of the car is detected, and an elevator control device (7) that controls operation of the car. If a malfunction of the motor-driven operator is detected, the elevator control device causes the car to be emergency stopped, and determines an operating state of the emergency stop device based on an overspeed detection signal transmitted from the safety control device.

Description

Technical Field

[0001] The present invention relates to an elevator device including an electric operator that activates an emergency stop device, and a control method for the elevator device. Background Technology

[0002] An emergency stop device that operates electrically without using a speed limiter rope has been proposed. As prior art relating to such an emergency stop device, the technology described in Patent Document 1 is known.

[0003] In this prior art, the car is equipped with a drive shaft for driving the emergency stop device and an electric actuator for operating the drive shaft. The electric actuator includes a mover mechanically connected to the drive shaft and an electromagnet that attracts the mover. The drive shaft is subjected to force by a drive spring, but normally, the electromagnet is energized and attracts the mover, thus limiting the movement of the drive shaft by the electric actuator.

[0004] In an emergency, the electromagnet is demagnetized, the restriction on the drive shaft is released, and the drive shaft is driven by the force of the drive spring. This activates the emergency stop device, bringing the car to an emergency stop.

[0005] Furthermore, when restoring the emergency stop device to its normal state, the electromagnet is moved and brought close to the mover that was moved during the emergency. The electromagnet includes a feed nut that engages with the feed screw shaft. When the motor rotates the feed screw shaft, the electromagnet moves toward the mover. After the electromagnet comes into contact with the mover, the mover is attracted to the electromagnet. Then, with the mover attracted to the electromagnet, the electromagnet is moved to return both the mover and the electromagnet to their normal standby position.

[0006] During the maintenance of electric emergency stop devices, it is necessary not only to check mechanical parts such as brake components (wedges), but also to check electrical equipment such as electromagnets and motors of the electric actuator for any abnormalities or deterioration.

[0007] As a prior art for improving the maintainability of electrical equipment, the technology described in Patent Document 2 is known.

[0008] The prior art includes: a mover detection switch for detecting the position of the mover; and a safety control device for detecting faults in the electric operator based on the position detection signal from the mover detection switch. When the electric operator is in standby mode, the safety control device issues a command to cut off the power supply to the first electromagnet, and then detects faults in the second electromagnet based on the position detection signal.

[0009] Existing technical documents

[0010] Patent documents

[0011] Patent Document 1: Japanese Patent Application Publication No. 2021-130550

[0012] Patent Document 2: International Publication No. 2023 / 058198 Summary of the Invention

[0013] The technical problem that the invention aims to solve

[0014] The technology described in the aforementioned patent document 2 does not take into account the situation where the electric operator malfunctions during normal operation of the elevator device.

[0015] Therefore, the present invention provides an elevator device that can perform safe actions when the electric operator malfunctions, and a control method for the elevator device.

[0016] Technical solutions to solve technical problems

[0017] To solve the above-mentioned technical problems, the elevator device of the present invention includes: a car; an emergency stop device installed on the car; an electric operator that activates the emergency stop device; a safety control device that activates the electric operator if an overspeed is detected in the car; and an elevator control device that controls the operation of the car. If a malfunction of the electric operator is detected, the elevator control device causes an emergency stop of the car, and determines the operating status of the emergency stop device based on an overspeed detection signal sent from the safety control device.

[0018] To solve the above-mentioned technical problems, the elevator device control method of the present invention is a control method for an elevator device including the following components: a car; an emergency stop device installed on the car; and an electric operator that operates the emergency stop device. In this control method, if a malfunction of the electric operator is detected, the car is brought to an emergency stop, and the operating status of the emergency stop device is determined based on the overspeed state of the car.

[0019] Invention Effects

[0020] According to the present invention, safe operation of elevator devices including electric actuators can be achieved.

[0021] The problems, structures, and effects beyond those described above become clearer through the following description of the implementation methods. Attached Figure Description

[0022] Figure 1 This is a simplified structural diagram of an elevator device as an example.

[0023] Figure 2 This is a top view showing the mechanism of the electric actuator in the embodiment.

[0024] Figure 3 This is a flowchart illustrating the safe operation of the elevator control device when the electric actuator malfunctions in the embodiment. Detailed Implementation

[0025] Hereinafter, an elevator device according to one embodiment of the present invention will be described with reference to the accompanying drawings. In the drawings, structural elements with the same reference numerals represent the same structural elements or structural elements having similar functions.

[0026] Figure 1 This is a simplified structural diagram of an elevator device as an embodiment of the present invention.

[0027] like Figure 1 As shown, the elevator device includes a car 1, speed sensors (5, 6), electric operator 10, drive mechanism (12-20), upper pull rod 21, and emergency stop device 2.

[0028] The car 1 is suspended in an elevator shaft located within a building by a main rope (not shown). The car 1 is slidably engaged with guide rail 4 via a guide device (not shown). If the main rope is driven by friction from a drive unit (traction machine: not shown), the car 1 moves up and down within the elevator shaft.

[0029] In this embodiment, a speed sensor is mounted on the car 1, including a rotary detector 6 and a roller 5 connected to the rotary shaft of the rotary detector 6. In this embodiment, the roller 5 is connected to the rotary shaft of the rotary detector 6 in such a way that the rotary shaft of the roller 5 is coaxial with the rotary shaft of the rotary detector 6. For example, a rotary encoder can be used as the rotary detector 6.

[0030] Roller 5 contacts guide rail 4. Therefore, roller 5 rotates when car 1 rises and falls, thus rotating detector 6. The safety control device, described later, monitors the operating speed of car 1 based on the rotation position signal output by rotation detector 6 as it rotates.

[0031] In addition, an image sensor can also be used as a speed sensor. In this case, the position and speed of the car 1 are detected based on image information of the surface state of the guide rail 4 acquired by the image sensor. For example, the speed can be calculated based on the distance traveled by image feature quantities within a specified time.

[0032] In this embodiment, the electric actuator 10 is an electromagnetic actuator and is disposed on the upper part of the car 1. The electromagnetic actuator includes a movable element or movable rod that operates, for example, via a solenoid or electromagnet. When the speed sensors (5, 6) detect a predetermined overspeed state of the car 1, the electric actuator 10 is activated. At this time, the pull rod 21 is pulled up by the drive mechanism (12-20) mechanically connected to the operating lever 11. As a result, the emergency stop device 2 is in a braking state.

[0033] The drive mechanism (12~20) will be described later.

[0034] Emergency stop devices 2 are arranged one on each side of the car 1. Each emergency stop device 2 has a pair of wedge-shaped brake elements (not shown) that can move between a braking position and a non-braking position, clamping the guide rail 4 in the braking position. Furthermore, as the car 1 descends, the brake elements rise relative to the car 1, and braking force is generated by the friction between the brake elements and the guide rail 4. Thus, when the car 1 enters an overspeed state, the emergency stop device 2 activates, thereby bringing the car 1 to an emergency stop.

[0035] The elevator device in this embodiment includes a so-called cordless speed governor system that does not use a speed governor rope. If the lifting speed of the car 1 exceeds the rated speed and reaches a first overspeed (e.g., a speed not exceeding 1.3 times the rated speed), the power supply to the drive unit (traction machine) and the power supply to the control device controlling the drive unit are cut off. Furthermore, if the descent speed of the car 1 reaches a second overspeed (e.g., a speed not exceeding 1.4 times the rated speed), the electric operator 10 installed on the car 1 is electrically driven, and the emergency stop device 2 is activated, thereby bringing the car 1 to an emergency stop.

[0036] In this embodiment, the cordless speed limiter system comprises the aforementioned speed sensors (5, 6) and a safety controller that determines the overspeed state of the car 1 based on the output signals of the speed sensors. This safety control device measures the speed of the car 1 based on the output signals of the speed sensors. If it determines that the measured speed has reached a first overspeed, it outputs a command signal to cut off the power to the drive unit (traction machine) and the power to the elevator control device controlling the drive unit. Furthermore, if it determines that the measured speed has reached a second overspeed, the safety control device outputs a command signal to activate the electric operator 10.

[0037] Furthermore, in this embodiment, although Figure 1 Although not shown in the figure, the safety control device is located on the upper part of the car 1 together with the electric operator 10.

[0038] The drive mechanism (12-20) that drives the upper pull rod 21 will be described below.

[0039] The operating lever 11 and the first actuating member 16 of the electric actuator 10 are connected and form a generally T-shaped first linkage member. The operating lever 11 and the first actuating member 16 respectively form the head and foot of the T-shape. The generally T-shaped first linkage member is rotatably supported on the upper beam 50 via the first actuating shaft 19 at the connection between the operating lever 11 and the first actuating member 16. The end of one of the pair of pull rods 21 (left side in the figure) is connected to the end of the first actuating member 16, which is the foot of the T-shape, on the opposite side of the connection between the operating lever 11 and the first actuating member 16.

[0040] Connector 17 and second actuating member 18 are connected to form a generally T-shaped second linkage member. Connector 17 and second actuating member 18 respectively form the head and foot of the T-shape. The generally T-shaped second linkage member is rotatably supported on the upper beam 50 via the second actuating shaft 20 at the connection between connector 17 and second actuating member 18. The end of the other of the pair of upper pull rods 21 (left side in the figure) is connected to the end of the second actuating member 18, which is the foot of the T-shape, on the opposite side of the connection between connector 17 and second actuating member 18.

[0041] The ends of the operating lever 11 extending from the inside of the housing 30 to the outside and the two ends of the connector 17, which are closer to the upper part of the car 1 than the second actuating shaft 20, are respectively connected to one end (left side in the figure) and the other end (right side in the figure) of the drive shaft 12 spanning the car 1. The drive shaft 12 slidably passes through the fixing part 14 fixed to the upper beam 50. In addition, the drive shaft 12 passes through the pressing member 15, which is fixed to the drive shaft 12. The pressing member 15 is located on the side of the second linkage member (connector 17, second actuating member 18) of the fixing part 14. The drive spring 13, which is an elastic body, is located between the fixing part 14 and the pressing member 15, and the drive shaft 12 is inserted into the drive spring 13.

[0042] When the electric actuator 10 is in operation, i.e., when the energization to the electromagnet is cut off in this embodiment, the electromagnetic force that restricts the movement of the operating lever 11 against the force of the drive spring 13 disappears. Therefore, the drive shaft 12 is driven along its length by the force applied to the pressing member 15 by the drive spring 13. Consequently, the first linkage member (operating lever 11, first actuating member 16) rotates about the first actuating axis 19, and the second linkage member (connecting member 17, second actuating member 18) rotates about the second actuating axis 20. As a result, one pull rod 21 of the first actuating member 16 connected to the first linkage member is driven and pulled up, and the other pull rod 21 of the second actuating member 18 connected to the second linkage member is driven and pulled up.

[0043] Figure 2 This refers to the mechanism of the electric actuator 10 in this embodiment, and is... Figure 1 The top view in the settings state. Additionally... Figure 2 The mechanism of the electric actuator 10 shown is in Figure 1 It is stored inside the basket.

[0044] Figure 2 The circuit structure for driving and controlling the electric actuator 10 is also described in the document.

[0045] Figure 2 (excluding the double-dotted section), Emergency Stop Device 2 ( Figure 1The elevator is in a non-braking state, and the electric operator 10 is in a standby state. In other words, the elevator is in a normal operating state.

[0046] like Figure 2 As shown, in the standby state, the movers (34a, 34b, 34c), which are movable components connected to the operating lever 11, are attracted by electromagnetic force to the electromagnets 35a and 35b, which are energized by the coil. Thus, the movement of the movers is counteracted by the drive shaft 12 ( Figure 1 The force F exerted by the operating lever 11 on the drive spring 13 of the mover is limited. Therefore, the electric actuator 10 counteracts the force of the drive spring 13, limiting the drive mechanism (12-20). Figure 1 (The movement of)

[0047] The mover has an adsorption part 34a that is adsorbed onto the magnetic pole surfaces of electromagnets 35a and 35b; and a support part 34b fixed to the adsorption part 34a and connected to an operating rod 11. The operating rod 11 is rotatably connected to the support part 34b of the mover via a connecting bracket 38. In the electric actuator 10, a mover detection switch 109 is provided at the position of the adsorption part 34a of the mover when in standby mode.

[0048] The mover also has a cam portion 34c fixed to the adsorption portion 34a. When the mover is in the standby position, the cam portion 34c operates the mover detection switch 109. When the mover detection switch 109 is operated by the cam portion 34c, it transitions from an on state to an off state, or from an off state to an on state. Therefore, it is possible to detect whether the mover is in the standby position based on the state of the mover detection switch 109. In this embodiment, the safety control device 103 determines whether the mover is in the standby position based on the state of the mover detection switch 109.

[0049] Furthermore, in this embodiment, the mover detection switch 109 is in the ON state when operated by the cam portion 34c.

[0050] In this embodiment, at least the adsorption portion 34a of the mover (34a, 34b, 34c) is made of a magnetic material. Soft magnetic materials such as low-carbon steel and palmite alloys (iron / nickel alloys) are preferably used as the magnetic material.

[0051] Figure 2 The other departments (36, 37, 39, 41) will be described later.

[0052] Electromagnets 35a and 35b are energized by a DC power supply 300. The energizing circuits for electromagnets 35a and 35b are configured as follows.

[0053] One end of the coil of electromagnet 35a is connected via fuse 107a to one end of the series connection of electrical contacts 104 and 105. Figure 2The middle part is the electrical contact 105 side. One end of the coil of the electromagnet 35b is connected to the series connection end of the electrical contacts 104 and 105 via the fuse 107b. Figure 2 The middle part is the side of electrical contact 105. The other end of the series connection of electrical contacts 104 and 105 ( Figure 2 The middle contact (on the 104 side) is connected to the high potential (positive terminal) of the DC power supply 300.

[0054] The other ends of the coils of electromagnets 35a and 35b are connected to each other and connected to the low potential (negative terminal) of DC power supply 300.

[0055] Therefore, as Figure 2 As shown, the coils of electromagnets 35a and 35b are connected in parallel via fuses 107a and 107b. One end of the parallel connection is connected to the high potential (positive terminal) of the DC power supply 300 via the series connection of electrical contacts 104 and 105. The other end of the parallel connection is connected to the low potential (negative terminal) of the DC power supply 300.

[0056] In this embodiment, the DC power supply 300 is composed of a rectifier or power conversion device that converts AC power from the commercial single-phase AC power supply 200 into DC power. The commercial single-phase AC power supply 200 may be one phase of a commercial three-phase AC power supply 400 that supplies power to the traction machine 500 and the elevator control device 7 that drives and controls the traction machine 500.

[0057] The DC power supply 300 serves as a power source for actuating the electromagnets 35a and 35b, the safety control device 103, the rotation detector 6, and the electrical contacts 104 and 105, as well as for generating the response signal (S0) described later.

[0058] The output of the DC power supply 300 is connected to a battery 111 for short-term compensation of power supply to the load during power outages or voltage drops. Thus, the commercial single-phase AC power supply 200 can maintain DC power supply during momentary power outages or voltage drops.

[0059] In addition, fuses 107a and 107b are respectively installed in the excitation circuit to protect electromagnets 35a and 35b from overcurrent.

[0060] The opening / closing of electrical contacts 104 and 105 is controlled by safety control device 103. In the standby state of electric operator 10, safety control device 103 controls electrical contacts 104 and 105 to be in the closed state. As a result, the coils of electromagnets 35a and 35b are energized, and electromagnets 35a and 35b generate electromagnetic force.

[0061] Furthermore, electrical contacts 104 and 105 are respectively composed of normally open contacts found in, for example, electromagnetic relays, electromagnetic contactors, and electromagnetic switches. In the excitation circuits of electromagnets 35a and 35b, multiple ( Figure 2 The device has two electrical contacts. As described later, when multiple electrical contacts are controlled to the open state to activate the emergency stop device 2, the energizer is cut off even if one contact fails to make contact. Therefore, the reliability of the operation of the electric actuator 10 is improved. Furthermore, a failure to make contact may occur, for example, due to contact welding.

[0062] Other electrical equipment sections (37, 112) will be described later.

[0063] via Figure 2 The signal line 106 shown is input to the safety control device 103. The response signal from the excitation circuit represents the potential of the high potential (positive terminal) of the DC power supply 300, which is connected to the parallel connection of the coils of electromagnets 35a and 35b via the series connection of electrical contacts 104 and 105.

[0064] Therefore, if electromagnets 35a and 35b are energized, the response signal indicates a high potential of the DC power supply 300; if electromagnets 35a and 35b are not energized, the response signal indicates a low potential of the DC power supply 300. Based on the potential indicated by such response signals, the safety control device 103 detects the energization status of electromagnets 35a and 35b, and simultaneously detects faults in electrical contacts 104 and 105.

[0065] Next, the operation of the electric actuator 10 when the emergency stop device 2 is in operation will be explained.

[0066] If the safety control device 103 detects a specified overspeed state (the aforementioned second overspeed speed) in the car 1 based on the rotational position signal S from the rotational detector 6, it outputs a disconnect command to the electrical contacts 104 and 105 respectively. Upon receiving the disconnect command, the electrical contacts 104 and 105 change from the on state (…). Figure 2 The electromagnetic force acting on the mover (34a, 34b, 34c) disappears because the excitation of electromagnets 35a and 35b stops. Consequently, the restriction on the mover caused by the attraction of the mover's adsorption part 34a by electromagnets 35a and 35b is released, and the mover moves freely due to the force of the driving spring 13. Figure 2 (F in the middle), from the standby state position ( Figure 2 It moves to position P in the direction of the force of the driving spring 13 (to the right in the diagram). Furthermore, Figure 2 The mover is represented by a double-dotted line.

[0067] With the restriction on the moving part being released, the drive shaft 12 is pressed by the push member 15 of the drive shaft 12. Figure 1 The drive shaft 12 is driven by the force exerted by the drive spring 13 (Fig. 1) on the fixed part 14 (Fig. 1) in the direction toward the pressing member 15 (Fig. 1). When the drive shaft 12 is driven, the first linkage member (operating lever 11 and first actuating member 16) connected to the drive shaft 12 is activated. Figure 1 ) around the first motion axis 19 ( Figure 1 ) rotates. This causes the upper pull rod 21 (connected to the first actuating element 16) to rotate. Figure 1 The drive shaft 12 is pulled up. Additionally, when the drive shaft 12 is driven, the second linkage member connected to the drive shaft 12 (operating lever 17 and second actuating member 18) is pulled up. Figure 1 ) around the second motion axis 20 ( Figure 1 ) rotates. This causes the upper pull rod 21 (connected to the second actuator 18) to rotate. Figure 1 (It) was pulled up.

[0068] Next, the reset action of the electric actuator 10 will be explained.

[0069] In order to restore the working state of the electric actuator 10 driven by the demagnetization of electromagnets 35a and 35b to position P, the actuator 10 is restored to its original working state. Figure 2 In the standby state where the mover is attracted by electromagnets 35a and 35b as shown, as described below, the mover (34a, 34b, 34c) is moved from the moving position (…) by means of the mechanism parts (36, 37, 39, 41) and the electrical equipment parts (37, 112), which are omitted from the description. Figure 2 The position P in the middle is restored to the position when in standby mode. Figure 2 ).

[0070] The electric actuator 10 has a feed screw 36 for driving the actuator. The feed screw 36 is coaxially connected to the rotating shaft of the electric motor 37 and is rotatably supported by a support member 41. Electromagnets 35a and 35b are fixed to an electromagnet support plate 39 having a feed nut portion (not shown). The feed nut portion of the electromagnet support plate 39 is screwed onto the feed screw 36. The feed screw 36 is rotated by the electric motor 37. The electric motor 37 is driven by a motor control device 112.

[0071] The motor control device 112 includes a drive circuit for the motor 37, which controls the rotation of the motor 37 according to control commands from the elevator control device 7. The motor 37 can be a DC (direct current) motor or an AC (alternating current) motor.

[0072] The elevator control device 7 controls the operation of the car 1 and has information related to the operating status of the elevator system. In this embodiment, as described above, the elevator control device 7 also has the function of controlling the motor 37 of the electric operator 10.

[0073] Furthermore, in this embodiment, the elevator control device 7 includes: a power converter 70 such as an inverter device driving the motor 501 of the traction machine 500; a control unit that controls the motor 501 by controlling the power converter 70; a DC power supply for the braking device 502 of the traction machine 500; and a control unit that controls the opening and closing of the braking device 502. The elevator control device 7 receives AC power from a commercial three-phase AC power supply 400 via normally open contacts provided by electromagnetic contactors, electromagnetic switches, etc. Under normal conditions, the normally open contacts are in the closed state.

[0074] The elevator control device 7 controls the motor 501 based on the detection signal of the rotation detector 510 (e.g., a rotary encoder) that detects the rotation of the motor 501, and the motor current detected by the current sensor 520, thereby controlling the operation of the car 1.

[0075] When the safety control device 103 determines that the speed of the car 1 has reached the first overspeed speed mentioned above, it outputs a command signal Sc, which sends a command to the electromagnetic contactor or electromagnetic switch to open the normally open contact. As a result, the power supply from the commercial three-phase AC power supply 400 to the elevator control device 7 is cut off, thus stopping the drive control of the motor 501, and simultaneously putting the braking device 502 into braking mode. Therefore, the car 1 comes to an emergency stop.

[0076] The reset action of the electric operator 10 is performed when the elevator device is restored after the emergency stop device 2 is activated or the car 1 is stopped due to a power outage.

[0077] When the electric operator 10 is returned to standby mode, the elevator control device 7 sends a rotation command for the motor 37 to the motor control device 112. Upon receiving the rotation command, the motor control device 112 drives the motor 37 to rotate the feed screw 36. Through the interaction between the rotating feed screw 36 and the feed nut portion of the electromagnet support plate 39, the rotation of the motor 37 is converted into linear movement of the electromagnets 35a and 35b along the axial direction of the feed screw 36. Consequently, the electromagnets 35a and 35b approach position P of the mover (34a, 34b, 34c) and come into contact with it.

[0078] In order to control the motor 37, the motor control device 112 monitors the motor current flowing through the motor 37. As described above, when the electromagnets 35a and 35b come into contact with the mover, the load on the motor 37 increases, and therefore the motor current increases. When the motor current increases and exceeds a predetermined value, the motor control device 112 determines that the electromagnets 35a and 35b have come into contact with the mover. The motor control device 112 sends this determination result to the safety control device 103 and the elevator control device 7.

[0079] If the safety control device 103 receives a judgment result from the motor control device 112, it outputs a connection command signal to the electrical contacts 104 and 105 as control command signals S1 and S2, respectively. Through the connection command signal, the electrical contacts 104 and 105 transition from an open state to an on state. As a result, the electromagnets 35a and 35b are energized. The adsorption part 34a of the mover is attracted by the electromagnetic force of the energized electromagnets 35a and 35b.

[0080] If the elevator control device 7 receives the above-mentioned determination result from the motor control device 112, it sends a reverse command to the motor control device 112 for the motor 37. If the motor control device 112 receives the reverse command, it reverses the rotation direction of the motor 37, causing the feed screw 36 to rotate in the opposite direction. As a result, the mover attracted by the electromagnets 35a and 35b bears the force of the drive spring 13 and moves together with the electromagnets 35a and 35b toward the standby position. Figure 2 )move.

[0081] From the moment the electric actuator 10 operates and the mover (34a, 34b, 34c) moves to position P, the cam portion 34c of the mover (34a, 34b, 34c) separates from the mover detection switch 109 just before the electric actuator 10 is about to complete its reset action. Therefore, at this time, the mover detection switch 109 is in the off state.

[0082] When the movers (34a, 34b, 34c) attracted by electromagnets 35a and 35b move from position P to the standby position, the mover detection switch 109 is activated by the cam portion 34c of the mover. When the mover detection switch 109 is activated, the elevator control device 7 determines that the mover is in the standby position. Based on this determination, the elevator control device 7 sends a stop command to the motor control device 112 for the motor 37. If the motor control device 112 receives the stop command, it stops the rotation of the motor 37.

[0083] If the elevator control device 7 detects a fault in the electric operator 10 during normal operation of the car 1 (not in an overspeed state and not in a power outage state), it stops the power converter 70 from supplying power to the motor 501 and simultaneously activates the braking device 502 to bring the car 1 to an emergency stop.

[0084] In this embodiment, the elevator control device 7 detects faults in the electric operator 10 via the mover detection switch 109. The elevator control device 7 monitors the on / off state of the mover detection switch 109. If a transition from the on state to the off state is detected, that is, if the mover (34a, 34b, 34c) is detected moving from the standby position during normal operation, it is determined that the electric operator 10 has malfunctioned.

[0085] The elevator control device 7 has a rescue operation function, but depending on the working status of the emergency stop device 2, it may be difficult to move the car 1. Therefore, before performing a rescue operation, the working status of the emergency stop device 2 is determined. In this embodiment, the elevator control device 7 determines the working status of the emergency stop device 2 based on the presence or absence of an overspeed detection signal from the safety control device 103.

[0086] As described above, if the safety control device 103 determines that the descent speed of the car 1 measured by the speed sensors (5, 6) has reached the second overspeed, it outputs a command signal to activate the electric operator 10. The safety control device 103 sends this command signal as an overspeed detection signal to the elevator control device 7. Furthermore, the safety control device 103 and the elevator control device 7 are communicatively connected to each other.

[0087] If the elevator control device 7 does not receive an overspeed detection signal from the safety control device 103, it is determined that the emergency stop device 2 is not working, or that it is working not because of the car 1 overspeeding but because of a malfunction of the electric operator 10.

[0088] When the emergency stop device 2 is not working, the elevator control device can perform rescue operations.

[0089] When the emergency stop device 2 is activated due to a malfunction of the electric actuator 10, the elevator control system can perform an upward rescue operation. However, if the car 1 is moved downwards, a wedge effect will occur in the brake of the emergency stop device 2, preventing the car 1 from moving and thus preventing a rescue operation.

[0090] Therefore, in this embodiment, when the elevator control device 7 does not receive an overspeed detection signal from the safety control device 103, it operates as a rescue mechanism, causing the car 1 to move from the stopped position to the nearest floor above. After the elevator control device 7 stops the car at the nearest floor, it opens the car door and the landing door of the car 1.

[0091] Figure 3 This is a flowchart illustrating the safe operation of the elevator control device 7 when the electric actuator 10 malfunctions in this embodiment. Refer to the relevant documentation as appropriate. Figure 1 , 2 Please provide an explanation.

[0092] In this embodiment, the control unit of the elevator control device 7 includes a computer system such as a microcomputer, which performs safety actions by executing a prescribed program.

[0093] In step S301, the elevator control device 7 determines whether the mover detection switch 109 is in the off state during normal operation of the car 1 (not in an overspeed state and not in a power outage state).

[0094] During normal operation of the car 1, when the mover detection switch 109 changes from the ON state to the OFF state, the movers (34a, 34b, 34c) of the electric operator 10 malfunction. Therefore, in step S301, the elevator control device 7 determines whether the electric operator 10 has malfunctioned.

[0095] If the elevator control device 7 determines that the actuator detection switch 109 is not in the off state (No in step S301), that is, in the on state, then it executes step S301 again. That is, the elevator control device 7 continuously monitors for malfunctions of the electric operator 10. Furthermore, if the elevator control device 7 determines that the actuator detection switch 109 is in the off state (Yes in step S301), then it proceeds to step S302.

[0096] In step S302, the elevator control device 7 causes the traction machine 500 to stop urgently. In this situation, the elevator control device 7 issues a command to stop the motor 501 and simultaneously issues a command to activate the braking device 502. Therefore, the car 1 is brought to an emergency stop. After executing step S302, the elevator control device 7 proceeds to step S303.

[0097] In step S303, the elevator control device 7 determines, based on the overspeed detection signal from the safety control device 103, whether the safety control device 103 has detected the aforementioned second overspeed. As described above, if the descent speed of the car 1 reaches the second overspeed, the electric operator 10 activates the emergency stop device 2. Therefore, in step S303, the elevator control device 7 determines whether the emergency stop device 2 is not activated, or whether the activation is due to a malfunction of the electric operator 10 rather than the car overspeed.

[0098] If the elevator control device 7 determines that the safety control device 103 has not detected the second overspeed (Yes in step S303), that is, if it determines that the emergency stop device 2 is not working or that the emergency stop device 2 is working due to a malfunction of the electric operator 10, then it proceeds to step S304. Alternatively, if the elevator control device 7 determines that the safety control device 103 has detected the second overspeed (No in step S303), that is, if it determines that the emergency stop device 2 is working due to the overspeed of the car 1, it keeps the car 1 in an emergency stop state and ends the series of processes. Afterwards, the elevator system enters a state awaiting technician operation.

[0099] In step S304, the elevator control device 7 determines whether the current position of the car 1 is between the top floor and the floor before the top floor.

[0100] If the emergency stop device 2 is not activated, rescue operations can be performed in both the vertical and horizontal directions. Even if the emergency stop device 2 is activated due to a malfunction of the electric operator 10, rescue operations can still be performed upwards. Therefore, if the elevator control device 7 determines that the safety control device 103 has not detected the second overspeed (No in step S303), it can perform an upward rescue operation.

[0101] When the rescue operation is executed at the nearest floor, if the car 1 is located between the top floor and the floor preceding it, the car 1 will be moved to the top floor. If the car 1 stops at the top floor, it will be difficult for technicians to perform recovery work after the rescue operation. In particular, in this embodiment, the drive mechanism of the emergency stop device 2 and the electric actuator 10 are located on the car 1, making recovery work even more difficult. Therefore, in this embodiment, before executing the rescue operation, it is determined whether the current position of the car 1 is between the top floor and the floor preceding it, and whether it is the nearest floor above the emergency stop position of the car 1.

[0102] If the elevator control device 7 determines that the position of the car 1 is not between the top floor and the floor before it, i.e., the nearest floor is not the top floor (yes in step S304), then it proceeds to step S305. Alternatively, if the elevator control device 7 determines that the position of the car 1 is between the top floor and the floor before it, i.e., the nearest floor is the top floor (no in step S304), then it keeps the car 1 in an emergency stop state and ends the series of processes. Afterwards, the elevator system enters a state awaiting technical personnel.

[0103] In step S305, the elevator control device 7 releases the braking device 502, causing the emergency-stopped car 1 to restart its upward (UP) direction towards the nearest floor. After executing step S305, the elevator control device 7 then executes step S306.

[0104] In step S306, the elevator control device 7 drives the car door of the car 1, which has stopped at the nearest floor, to open the car door and the landing door that is engaged with the car door. Then, the car 1 remains stopped at the nearest floor and enters a dormant state. After executing step S306, the elevator control device 7 completes a series of processes. Afterward, the elevator enters a state awaiting technician operation.

[0105] According to the above embodiment, if a malfunction of the electric operator 10 is detected during normal operation of the car 1, the car 1 will be brought to an emergency stop. The working status of the emergency stop device will be determined based on whether the car 1 is in an overspeed state. Therefore, after an emergency stop, accurate and safe operation of the elevator system (in this embodiment, upward rescue operation) or accurate and safe handling of the elevator system can be achieved. Thus, the safety of an elevator system equipped with an electric emergency stop device is improved.

[0106] This invention is not limited to the embodiments described above, but also includes various modifications. For example, the above-described embodiments are detailed for ease of understanding and illustration of the invention, and the invention is not necessarily limited to including all the structures described. Furthermore, for a part of the structure of the embodiments, other structures can be added, deleted, or replaced.

[0107] For example, as long as reliability can be ensured, there can be only one electrical contact.

[0108] Alternatively, the excitation current based on a DC power supply can be used as the response signal from the excitation circuit. In this case, the excitation current is detected by a current sensor, and when the excitation current is detected, the safety control device determines that there is a connection fault in the electrical contacts. Conversely, if the current detection value is zero, the safety control device determines that the electrical contacts are normal.

[0109] In addition, other position detection sensors can be used to replace the mover detection switch 109, such as photoelectric position sensors, magnetic position sensors, proximity sensors (capacitive and inductive types), etc.

[0110] In addition, the electric operator 10 can be installed not only at the top of the car 1, but also at the bottom or side.

[0111] In addition, elevator equipment can be equipment with a machine room or so-called machine room-less elevators without a machine room.

[0112] Label Explanation

[0113] 1…Car, 2…Emergency stop device, 4…Guide rail, 5…Roller, 6…Rotation detector, 7…Elevator control device, 10…Electric operator, 11…Operating lever, 12…Drive shaft, 13…Drive spring, 14…Fixing part, 15…Pressing component, 16…First actuating component, 17…Connecting part, 18…Second actuating component, 19…First actuating shaft, 20…Second actuating shaft, 21…Pull rod, 30…Housing, 34a…Adsorption part, 34b…Support part, 34c…Cam part, 35a, 35b…Electromagnets, 36…Feed screw, 37…Motor, 38…Connecting bracket, 39…Electromagnetic support plate, 41…Supporting component, 50…Upper beam, 70…Power converter, 103…Safety controller, 104, 105…Electrical contacts, 106…Signal line, 107a, 107b…Fuse, 109…Motor detection switch, 111…Battery, 112…Motor control device, 200…Commercial single-phase AC power supply, 300…DC power supply, 400…Commercial three-phase AC power supply, 500…Traction machine, 501…Motor, 502…Brake device, 510…Rotation detector, 520…Current sensor.

Claims

1. An elevator device, comprising: The car; An emergency stop device is installed on the car. An electric actuator that activates the emergency stop device; A safety control device that activates the electric actuator if it detects that the car is speeding. as well as An elevator control device that controls the operation of the elevator car, characterized in that... If a malfunction is detected in the electric actuator, the elevator control device will bring the car to an emergency stop, and The elevator control device determines the working status of the emergency stop device based on the overspeed detection signal sent from the safety control device.

2. The elevator device as described in claim 1, characterized in that, If the overspeed detection signal is not received, the elevator control device executes an upward rescue operation of the car.

3. The elevator device as described in claim 2, characterized in that, Upon receiving the overspeed detection signal, the elevator control device keeps the car stationary.

4. The elevator device as described in claim 2, characterized in that, The rescue operation is a move to the nearest floor.

5. The elevator device as described in claim 4, characterized in that, The nearest floor is not the top floor.

6. The elevator device as claimed in claim 1, characterized in that, Includes a drive mechanism that drives the emergency stop device. The electric actuator activates the drive mechanism. The electric actuator includes: A mover, which is mechanically connected to the drive mechanism; and An electromagnet attracts the mover in its standby position, thereby restricting the movement of the drive mechanism, and is demagnetized when the car reaches a predetermined overspeed, thereby activating the drive mechanism.

7. The elevator device as described in claim 6, characterized in that, The elevator control device detects the fault in the electric operator based on the movement of the actuator from the standby position.

8. A control method for an elevator device, the elevator device comprising: The car; An emergency stop device is installed on the car. An electric actuator that activates the emergency stop device, the control method being characterized in that... If a malfunction of the electric actuator is detected, the car is brought to an emergency stop, and the working status of the emergency stop device is determined based on the overspeed status of the car.

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