Elevator device

Abstract

Disclosed is an elevator device which is provided with an electric emergency braking device and which can be smoothly restored when power is restored. This elevator device is provided with: a car; an emergency brake device provided in the car; and an electric operator (10) for operating the emergency braking device, the elevator device being provided with: a first control device (103) for detecting and storing the traveling state of the car during a power failure period; and a second control device (7) that, on the basis of the travel state stored by the first control device, restores the electric operator that operates with power failure to a standby state.

Description

Technical Field

[0001] The present invention relates to an elevator device having an electric emergency braking device. Background Art

[0002] In an elevator device, in order to always monitor the ascending / descending speed of a car and to urgently stop the car that has fallen into a specified overspeed state, a governor and an emergency braking device are provided. Generally, the governor is coupled to the car by a governor rope. When an overspeed state is detected, the governor restrains the governor rope, whereby the emergency braking device on the car side is actuated to urgently stop the car.

[0003] In such an elevator device, since the governor rope, which is a long strip, is laid in a hoistway, it is difficult to save space and reduce costs. In addition, when the governor rope vibrates, interference is likely to occur between the structures in the hoistway and the governor rope.

[0004] On the other hand, an emergency braking device that performs electrical work without using a governor rope has been proposed. As prior art related to such an electric emergency braking device, the technique described in Patent Document 1 is known.

[0005] In this prior art, a drive shaft for driving an emergency braking device and an electric operator for operating the drive shaft are provided on a car. The electric operator has a movable iron core mechanically connected to the drive shaft and an electromagnet that attracts the movable iron core. The drive shaft is biased by a drive spring, but normally, the electromagnet is energized to attract the movable iron core, so the movement of the drive shaft is restrained by the electric operator.

[0006] In an emergency, the electromagnet is demagnetized to release the restraint on the drive shaft, and the drive shaft is driven by the acting force of the drive spring. Thereby, the emergency braking device operates and the car stops urgently.

[0007] In addition, when returning the emergency braking device to the normal state, the electromagnet is moved closer to the movable iron core that has moved in an emergency. The electromagnet has a feed nut screwed onto a feed screw shaft. When the feed screw shaft is rotated by a motor, the electromagnet moves toward the movable iron core. After the electromagnet abuts against the movable iron core, the movable iron core is attracted by the electromagnet. And in a state where the movable iron core is attracted by the electromagnet, the electromagnet is moved to return the movable iron core and the electromagnet to the standby position in normal times.

[0008] Prior Art Documents

[0009] Patent Documents

[0010] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2021-130550 Summary of the Invention

[0011] Problems to be Solved by the Invention

[0012] In the above prior art, when the power supply of the electromagnet of the electric actuator disappears due to a power outage, the emergency braking device operates as in the case of overspeed state detection. Therefore, it is difficult for the elevator device to resume operation when the power supply is restored.

[0013] Accordingly, the present invention provides an elevator device having an electric emergency braking device and capable of smoothly resuming operation when the power supply is restored.

[0014] Means for Solving the Problems

[0015] To solve the above problems, the elevator device of the present invention includes: a car; an emergency braking device provided in the car; and an electric actuator that operates the emergency braking device, wherein the elevator device has: a first control device that detects and stores the traveling state of the car during a power outage; and a second control device that returns the electric actuator that operates during a power outage to a standby state based on the traveling state stored by the first control device.

[0016] Advantages of the Invention

[0017] According to the present invention, it is possible to smoothly resume an elevator device having an electric emergency braking device when the power supply is restored.

[0018] Problems, configurations, and effects other than those described above will become apparent from the following description of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic configuration diagram of an elevator device according to an embodiment.

[0020] Figure 2 is a top view showing a mechanism portion of an electric actuator in the embodiment.

[0021] Figure 3 is a motion state diagram showing an example of the motion of a car in the embodiment during a power outage and when the power supply is restored.

[0022] Figure 4 is a motion state diagram showing another example of the motion of a car in the embodiment during a power outage and when the power supply is restored.

[0023] Figure 5 is a flowchart showing a processing operation during a power outage of a safety control device in the embodiment.

[0024] Figure 6 is a flowchart showing a processing operation for restoring an electric actuator by an elevator control device in the embodiment. DETAILED DESCRIPTION OF THE INVENTION

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

[0026] Figure 1 It is a schematic structural diagram of an elevator device according to an embodiment of the present invention.

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

[0028] The car 1 is suspended in a hoistway of a building by a main rope (not shown) and is engaged with a guide rail 4 in a slidable manner via a guiding device (not shown). When the main rope is frictionally driven by a driving device (a hoist: not shown), the car 1 moves up and down in the hoistway.

[0029] In this embodiment, the speed sensors are provided on the car 1 and include: a rotation detector 6, and a roller 5 connected to the rotation axis of the rotation detector 6. In this embodiment, the roller 5 is connected to the rotation axis of the rotation detector 6 such that the rotation axis of the roller 5 is coaxial with the rotation axis of the rotation detector 6. As the rotation detector 6, for example, a rotary encoder can be applied.

[0030] The roller 5 is in contact with the guide rail 4. Therefore, when the car 1 moves up and down, the roller 5 rotates, and thus, the rotation detector 6 rotates. Based on the rotation position signal output by the rotation detector 6 as it rotates, a safety control device described later monitors the traveling speed of the car 1.

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

[0032] The electric operator 10 is an electromagnetic operator in this embodiment and is disposed above the car 1. The electromagnetic operator has, for example, a movable piece or a movable rod that operates by a solenoid or an electromagnet. When a specified overspeed state of the car 1 is detected by the speed sensors (5, 6), the electric operator 10 operates. At this time, the hoisting rod 21 is lifted by the drive mechanism (12 - 20) mechanically connected to the operating rod 11. As a result, the emergency braking device 2 enters a braking state.

[0033] In addition, the drive mechanism (12 - 20) will be described later.

[0034] An emergency braking device 2 is arranged on each of the left and right sides of the car 1. A pair of wedge-shaped braking members (not shown) provided in each emergency braking device 2 are movable between a braking position and a non-braking position, and clamp the guide rail 4 in the braking position. Moreover, when the braking members relatively rise with respect to the car 1 due to the descent of the car 1, a braking force is generated due to the frictional force acting between the braking members and the guide rail 4. Thus, the emergency braking device 2 operates when the car 1 gets into an overspeed state, and makes the car 1 stop urgently.

[0035] The elevator device of this embodiment has a so-called main shaft governor system that does not use governor ropes. When the lifting and lowering speed of the car 1 exceeds the rated speed and reaches the first overspeed (for example, a speed not exceeding 1.3 times the rated speed), the power supply of the driving device (hoist) and the power supply of the control device that controls the driving device are cut off. In addition, when the descending speed of the car 1 reaches the second overspeed (for example, a speed not exceeding 1.4 times the rated speed), the electric operator 10 provided on the car 1 operates electrically to make the emergency braking device 2 operate, and the car 1 stops urgently.

[0036] In this embodiment, the main shaft governor system is composed of the above speed sensors (5, 6) and a safety control device that determines the overspeed state of the car 1 based on the output signals of the speed sensors. The safety control device measures the speed of the car 1 based on the output signals of the speed sensors, and when it determines that the measured speed reaches the first overspeed, it outputs a command signal for cutting off the power supply of the driving device (hoist) and the power supply of the control device that controls the driving device. In addition, when the safety control device determines that the measured speed reaches the second overspeed, it outputs a command signal for making the electric operator 10 operate.

[0037] In addition, in this embodiment, although not shown in Figure 1 , the safety control device and the electric operator 10 are arranged on the upper part of the car 1.

[0038] Hereinafter, the drive mechanism (12 - 20) for driving the lifting rod 21 will be described.

[0039] The operating rod 11 of the electric operator 10 is connected to the first working piece 16 to form a substantially T-shaped first link member. The operating rod 11 and the first working piece 16 respectively form the head and the foot of the T. The substantially T-shaped first link member is supported rotatably via the first working shaft 19 at the connecting portion of the operating rod 11 and the first working piece 16 by the crosshead 50. At the end of the first working piece 16 that forms the foot of the T and is opposite to the connecting portion of the operating rod 11 and the first working piece 16, the end of one (the left side in the figure) of the pair of lifting rods 21 is connected.

[0040] The connecting piece 17 is connected to the second working piece 18 to form a second link member in a substantially T shape. The connecting piece 17 and the second working piece 18 respectively form the head and the leg of the T shape. The substantially T-shaped second link member is supported rotatably on the crosshead 50 via the second working shaft 20 at the connecting portion of the connecting piece 17 and the second working piece 18. At the end of the second working piece 18 that forms the leg of the T shape and is on the side opposite to the connecting portion of the connecting piece 17 and the second working piece 18, the end of the other (the left side in the figure) of the pair of lifting rods 21 is connected.

[0041] The end of the operating rod 11 extending from the inside of the housing 30 to the outside and the end of the connecting piece 17 that is closer to the upper part of the car 1 than the second working shaft 20 among the two end parts are respectively connected to one end (the left side in the figure) and the other end (the right side in the figure) of the drive shaft 12 horizontally disposed on the car 1. The drive shaft 12 penetrates through the fixing portion 14 fixed to the crosshead 50 in a slidable manner. In addition, the drive shaft 12 penetrates through the pressing member 15, and the pressing member 15 is fixed to the drive shaft 12. Further, the pressing member 15 is located on the side of the second link member (connecting piece 17, second working piece 18) of the fixing portion 14. The drive spring 13 as an elastic body is located between the fixing portion 14 and the pressing member 15, and the drive shaft 12 is inserted through the drive spring 13.

[0042] When the electric actuator 10 operates, that is, when the power supply to the electromagnet is cut off in this embodiment, the electromagnetic force that restrains the movement of the operating rod 11 by overcoming the acting force of the drive spring 13 disappears. Therefore, by the acting force of the drive spring 13 applied to the pressing member 15, the drive shaft 12 is driven along the length direction. Accordingly, the first link member (operating rod 11, first working piece 16) rotates around the first working shaft 19, and the second link member (connecting piece 17, second working piece 18) rotates around the second working shaft 20. As a result, one of the lifting rods 21 connected to the first working piece 16 of the first link member is driven to lift, and the other lifting rod 21 connected to the second working piece 18 of the second link member is driven to lift.

[0043] Figure 2 is a top view showing the arrangement state of the mechanism portion of the electric actuator 10 of this embodiment. In addition, Figure 1 the mechanism portion of the electric actuator 10 shown Figure 2 is stored in the housing 30 in Figure 1 The circuit structure for driving and controlling the electric actuator 10 is also described in

[0044] Figure 2 In

[0045] In Figure 2 (wherein, except for the double-dashed line portion), the emergency braking device 2 ( Figure 1)It is a non-braking state, and the electric operator 10 is in a standby state. That is, the elevator device is in a normal operating state.

[0046] As Figure 2 shown, in the standby state, the movable parts, i.e., the movable members (34a, 34b, 34c) connected to the operating lever 11, are attracted to the electromagnets 35a, 35b whose coils are energized and excited by electromagnetic force. Thus, the driving spring 13 ( Figure 1 ) acting on the movable members via the drive shaft 12 ( Figure 1 ) and the operating lever 11 is overcome, and the movement of the movable members is restricted. Therefore, the electric operator 10 overcomes the acting force of the driving spring 13 and restricts the movement of the drive mechanism (12 - 20: Figure 1 ).

[0047] The movable members have: an adsorption part 34a that adsorbs to the magnetic pole surfaces of the electromagnets 35a, 35b; a support part 34b that is fixed to the adsorption part 34a and is connected to the operating lever 11. The operating lever 11 is connected to the support part 34b of the movable members in a rotatable manner via a connection bracket 38. In the electric operator 10, a movable member detection switch 109 is provided at the position where the adsorption part 34a of the movable members is located during standby.

[0048] The movable members further have a cam part 34c fixed to the adsorption part 34a. When the movable members are in the standby position, the cam part 34c operates the movable member detection switch 109. When the movable member detection switch 109 is operated by the cam part 34c, it changes from the on state to the off state, or from the off state to the on state. Therefore, it is possible to detect whether the movable members are in the standby position based on the state of the movable member detection switch 109. In this embodiment, the safety control device 103 determines whether the movable members are in the standby position based on the state of the movable member detection switch 109.

[0049] In addition, in this embodiment, the movable member detection switch 109 is in the on state when operated by the cam part 34c.

[0050] In this embodiment, among the movable members (34a, 34b, 34c), at least the adsorption part 34a is made of a magnetic material. As the magnetic material, soft magnetic materials such as low-carbon steel or permalloy (iron / nickel alloy) are preferably used.

[0051] Regarding Figure 2 the other mechanism parts (36, 37, 39, 41), they will be described later.

[0052] The electromagnets 35a and 35b are excited by a DC power supply 300. In the excitation circuit of the electromagnet 35a, one end of the coil of the electromagnet 35a is connected to the high-potential side of the DC power supply 300 via the electrically connected contacts 104a, 105a and the fuse 107a connected in series, and the other end of the coil of the electromagnet 35a is connected to the low-potential side of the DC power supply 300. In the excitation circuit of the electromagnet 35b, one end of the coil of the electromagnet 35b is connected to the high-potential side of the DC power supply 300 via the electrically connected contacts 104b, 105a and the fuse 107b connected in series, and the other end of the coil of the electromagnet 35b is connected to the low-potential side of the DC power supply 300.

[0053] In the present embodiment, the DC power supply 300 is composed of a rectifying device and a power conversion device that convert AC power from a commercial single-phase AC power supply into DC power. The commercial single-phase AC power supply 500 may also be one phase of a commercial three-phase AC power supply 400 that supplies power to the hoist 200 and the elevator control device 7 that drives and controls the hoist 200.

[0054] The DC power supply 300 is a power supply that is used not only to operate the electromagnets 35a and 35b, but also to operate the safety control device 103, the rotation detector 6, the electrically connected contacts 104a, 104b, 105a, and 105b, and is a power supply for generating the response signals (106a, 106b) described later.

[0055] A battery 111 is connected to the output of the DC power supply 300 to compensate for the power supply to the load for a short time in the event of a power outage or a voltage drop. Thus, in the case of an instantaneous power outage or an instantaneous voltage drop of the commercial single-phase AC power supply 500, the supply of DC power is maintained.

[0056] In addition, the fuses 107a and 107b are provided in the excitation circuit for overcurrent protection of the electromagnets 35a and 35b, respectively.

[0057] The electrically connected contacts 104a, 105a, 104b, and 105b are controlled to be turned on / off by the safety control device 103. In the standby state of the electric operator 10, the safety control device 103 controls each of the electrically connected contacts 104a, 105a, 104b, and 105b to be in the on state. Thus, the coils of the electromagnets 35a and 35b are energized, and therefore, the electromagnets 35a and 35b generate electromagnetic forces.

[0058] In addition, the electrically connected contacts 104a, 105a, 104b, and 105b are respectively composed of normally open contacts of, for example, electromagnetic relays, electromagnetic contactors, electromagnetic switches, etc. In each excitation circuit of the electromagnets 35a and 35b, a plurality of (in Figure 2In the middle, two electric contacts are connected in series. Thus, when multiple electric contacts are controlled to be in the open state in order to operate the emergency braking device 2 as described later, even if a closed fault occurs in one contact, the power supply to the electromagnet will be cut off. Therefore, the reliability of the operation of the electric actuator 10 is improved. In addition, for example, a closed fault occurs due to welding of the contacts.

[0059] Regarding the other electrical equipment parts (37, 112), they will be described later. In addition, the signal lines 106a and 106b are used to input the response signals from the respective excitation circuits of the electromagnets 35a and 35b to the safety control device 103.

[0060] The response signal input to the safety control device 103 via the signal line 106a (hereinafter referred to as "response signal (106a)") represents the potential of one end of the coil of the electromagnet 35a that is connected to the high-potential side of the DC power supply 300 via the electric contacts 104a and 105a. Therefore, if the electromagnet 35a is energized, the response signal (106a) represents the potential of the high-potential side of the DC power supply 300 (high potential (HIGH)), and if the electromagnet 35a is not energized, the response signal (106a) represents the potential of the low-potential side of the DC power supply 300 (low potential (LOW)). Based on the potential represented by such a response signal (106a), the safety control device 103 detects the energized state of the electromagnet 35a.

[0061] The response signal input to the safety control device 103 via the signal line 106b (hereinafter referred to as "response signal (106b)") represents the potential of one end of the coil of the electromagnet 35b that is connected to the high-potential side of the DC power supply 300 via the electric contacts 104b and 105b. Therefore, if the electromagnet 35b is energized, the response signal (106b) represents the potential of the high-potential side of the DC power supply 300 (high potential (HIGH)), and if the electromagnet 35b is not energized, the response signal (106b) represents the potential of the low-potential side of the DC power supply 300 (low potential (LOW)). Based on the potential represented by such a response signal (106b), the safety control device 103 detects the energized state of the electromagnet 35b.

[0062] Next, the operation of the electric actuator 10 when the emergency braking device 2 operates will be described.

[0063] When the safety control device 103 detects a specified overspeed state (the above-mentioned second overspeed) of the car 1 based on the rotation position signal S from the rotation detector 6, it outputs disconnection commands to the electric contacts 104a, 105a, 104b, and 105b respectively. According to the disconnection commands, the electric contacts 104a, 105a, 104b, and 105b change from the closed state ( Figure 2) is changed to the disconnected state. Therefore, the excitation of the electromagnets 35a and 35b stops, and the electromagnetic force acting on the movable member (34a, 34b, 34c) disappears. As a result, the restraint of the movable member caused by the adsorption of the adsorption portion 34a of the movable member by the electromagnets 35a and 35b is released, and the movable member is moved by the force of the driving spring 13 ( Figure 2 F) and from the standby position ( Figure 2 ) moves to position P in the direction of the urging force of the drive spring 13 (right direction in the figure).

[0064] In addition, Figure 2 In FIG. 1 , the movable part after the movement is indicated by a two-dot chain line.

[0065] As the restraint of the movable member is released, the driving shaft 12 is pressed by the pressing member 15 ( Figure 1 ) is borne by the fixing portion 14 ( Figure 1 ) toward the pressing part ( Figure 1 ) direction, drive spring 13 ( Figure 1 ) is driven by the force of the driving shaft 12. When the driving shaft 12 is driven, the first connecting rod component (operating rod 11 and first working piece 16) connected to the driving shaft 12: Figure 1 ) around the first working axis 19 ( Figure 1 ) rotates. As a result, the lifting rod 21 ( Figure 1 ) is lifted. In addition, when the drive shaft 12 is driven, the second connecting rod member (connecting piece 17 and second working piece 18) connected to the drive shaft 12: Figure 1 ) around the second working axis 20( Figure 1 ) rotates. As a result, the lifting rod 21 ( Figure 1 ) was promoted.

[0066] Next, the recovery operation of the electric operating device 10 will be described.

[0067] In order to restore the electric operator 10 from the working state where the movable element is moved to the position P by demagnetizing the electromagnets 35a and 35b, Figure 2 The movable member is in a standby state where the movable member is attracted by the electromagnets 35a and 35b. As described below, the movable member (34a, 34b, 34c) is moved from the moving position ( Figure 2 position P) returns to the standby position ( Figure 2 ).

[0068] The electric actuator 10 has a feed screw 36 for driving a movable member. The feed screw 36 is coaxially connected to the rotating shaft of the motor 37 and is supported by a support member 41 so as to be rotatable. The 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 motor 37. The motor 37 is driven by a motor control device 112.

[0069] The motor control device 112 has a drive circuit for the motor 37 and controls the rotation of the motor 37 according to a control command from the elevator control device 7. The motor 37 can be either a DC motor or an AC motor.

[0070] The elevator control device 7 controls the operation of the car 1 and has information related to the operating state of the elevator device. In the present embodiment, as described above, the elevator control device 7 also has a function of controlling the motor 37 provided in the electric actuator 10.

[0071] In addition, in the present embodiment, the elevator control device 7 includes: a power conversion device such as an inverter device for driving the motor 201 of the hoist 200, a control unit for controlling the motor 201 by controlling the power conversion device, a DC power supply for the brake device 202 of the hoist 200, and a control unit for controlling the opening and closing of the brake device 202. AC power is supplied to the elevator control device 7 from a commercial three-phase AC power supply 400 via normally open contacts of electromagnetic contactors, electromagnetic switches, etc. Normally, the normally open contacts are closed.

[0072] When the safety control device 103 determines that the speed of the car 1 has reached the above-described first over-speed, it outputs a command signal Sc, commands an electromagnetic contactor or an electromagnetic switch, etc. through Sc 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. Therefore, the drive control of the motor 201 stops, and the brake device 202 enters a braking state. Therefore, the car 1 stops urgently.

[0073] The monitoring device 600 monitors the operating state of the elevator device based on the information possessed by the elevator control device 7. When an abnormality occurs in the elevator device, the monitoring device 600 sends an abnormality report signal or information related to the abnormal operating state to a monitoring server 801 provided in a control center 800 via a communication network 700, where the control center 800 is located at a location geographically far from the installation site of the elevator device.

[0074] When the electric actuator 10 is restored to the standby state, the elevator control device 7 issues a rotation command for the motor 37 to the motor control device 112. When receiving the rotation command, the motor control device 112 drives the motor 37 to rotate the feed screw 36. Through the feed nut portion provided on the rotating feed screw 36 and the electromagnet support plate 39, the rotation of the motor 37 is converted into a linear movement of the electromagnets 35a and 35b along the axial direction of the feed screw 36. As a result, the electromagnets 35a and 35b approach the movement position P of the movable members (34a, 34b, 34c) and abut against the movable members.

[0075] The motor control device 112 monitors the motor current in order to control the motor 37. As described above, when the electromagnets 35a and 35b abut against the movable members, the load on the motor 37 increases, and thus the motor current increases. If the motor current increases and exceeds a specified value, the motor control device 112 determines that the electromagnets 35a and 35b are in contact with the movable members. The motor control device 112 transmits this determination result to the safety control device 103 and the elevator control device 7.

[0076] When receiving the determination result from the motor control device 112, the safety control device 103 outputs energization commands to the electric contacts 104a, 105a, 104b, and 105b respectively. According to the energization commands, the electric contacts 104a, 105a, 104b, and 105b change from the off state to the on state. Therefore, the electromagnets 35a and 35b are energized. The electromagnetic force generated by the energized electromagnets 35a and 35b acts, and the adsorption portion 34a in the movable members is adsorbed by the electromagnets 35a and 35b.

[0077] When the elevator control device 7 receives the above determination result from the motor control device 112, it transmits a reverse rotation command for the motor 37 to the motor control device 112. When receiving the reverse rotation command, the motor control device 112 reverses the rotation direction of the motor 37 and reverses the feed screw 36. As a result, the movable members adsorbed by the electromagnets 35a and 35b are driven by the biasing force of the drive spring 13 and move together with the electromagnets 35a and 35b toward the standby position ( Figure 2 )).

[0078] From the time when the electric actuator 10 operates and the movable members (34a, 34b, 34c) move to the position P until before the electric actuator 10 completes the restoration operation ( Figure 3 ), the cam portion 34c provided on the movable members (34a, 34b, 34c) is separated from the movable member detection switch 109. Therefore, at this time, the movable member detection switch 109 is in the off state.

[0079] When the movable members (34a, 34b, 34c) adsorbed by the electromagnets 35a and 35b reach the standby position from the position P, the movable member detection switch 109 is operated by the cam portion 34c provided on the movable member. When the movable member detection switch 109 is operated, the elevator control device 7 determines that the movable member is in the standby position. Based on this determination result, the elevator control device 7 sends a stop command for the motor 37 to the motor control device 112. When receiving the stop command, the motor control device 112 stops the rotation of the motor 37.

[0080] Next, a schematic operation of the elevator device of the present embodiment during a power outage and during power restoration will be described.

[0081] The safety control device 103 detects the voltage between the output terminals of the DC power supply 300 and detects a power outage based on the decrease in the detected voltage. When the safety control device 103 detects a power outage, it stores the speed, traveling direction, and position of the car 1 detected based on the rotation position signal S from the rotation detector 6 in the non-volatile storage device 130. At this time, the safety control device 103 continues to detect the speed, traveling direction, and position of the car 1 using the stored power of the battery 111.

[0082] Since the data representing the traveling state of the car 1 at the time of power outage, such as speed, traveling direction, and position, is stored in the non-volatile storage device 130, it will be retained and not deleted even during the power outage. In addition, as the non-volatile storage device, a semiconductor memory such as an EPROM or a magnetic memory is used.

[0083] In addition, the safety control device 103 in the present embodiment has a function of detecting the traveling direction and position of the car 1 based on the rotation position signal S in addition to the function of detecting the speed of the car 1 based on the rotation position signal S of the rotation detector 6. The traveling direction of the car 1 is detected based on the rotation direction of the rotation detector 6 represented by the rotation position signal S.

[0084] During power restoration, the safety control device 103 sends the data related to the traveling state of the car 1 during the power outage stored in the non-volatile storage device 130 to the elevator control device 7. In addition, the safety control device 103 detects the voltage between the output terminals of the DC power supply 300, and when it detects power restoration by the restoration of the detected voltage, or according to an instruction from the elevator control device 7, it sends data to the elevator control device 7.

[0085] When the power supply is restored, the elevator control device 7 determines whether the electric actuator 10 can perform a normal restoration operation based on the data received from the safety control device 103 and related to the running state of the car 1 during the power outage. When the elevator control device 7 determines that it is a running state in which the restoration operation can be performed, it causes the motor control device 112 to operate, thereby restoring the electric actuator 10 to the standby state.

[0086] When the biting of the braking member into the guide rail 4 in the emergency braking device 2 is large, it is difficult for the electric actuator 10 to perform a normal restoration operation. When the car 1 enters an overspeed state during descent, the emergency braking device 2 operates. And when, as the car 1 descends, the braking member bites deeply into the guide rail 4 and a large frictional force is generated, the car 1 stops emergently. After the car 1 stops emergently, in order to safely release the operating state of the emergency braking device 2, it is necessary to release the biting state of the braking member relative to the guide rail, so the operation of professional technicians is required.

[0087] As described above, when the running direction of the car 1 is the downward direction and the speed is high, the biting of the braking member in the emergency braking device 2 is large, and it is difficult for the electric actuator 10 to perform a normal restoration operation. Therefore, in this embodiment, the elevator control device 7 determines whether the electric actuator 10 can perform a normal restoration operation based on the running direction and speed of the car 1 during the power outage, and determines whether to operate the car 1 to release the operating state of the emergency braking device 2.

[0088] For example, when the elevator control device 7 determines that the car 1 descends at a low speed during the power outage, it controls the hoist 200 to make the car 1 perform an upward operation, safely releases the operating state of the emergency braking device 2, and then gives an instruction to the motor control device 112 to perform the restoration operation of the electric actuator 10.

[0089] Figure 3 It is an operation state diagram showing an example of the operation of the car 1 in this embodiment during the power outage and when the power supply is restored.

[0090] When a power outage occurs, the car 1 travels in the downward direction. The electromagnet 35a in the electric actuator 10 is demagnetized due to the power outage, so the electric actuator 10 operates and the movable member (only the adsorption portion 34a is shown in Figure 4 moves from the standby position. The car 1 descends at a low speed, so when it is braked by the braking device 202, it stops below the position at the time of the power outage.

[0091] When the power supply is restored, in order to release the operating state of the emergency braking device 2 before the restoration operation of the electric actuator 10, the car 1 automatically operates in the upward direction through the elevator control device 7 and stops.

[0092] When the operating state of the emergency braking device 2 is released, the electric operator 10 drives the electromagnet 35a to return the movable member to the standby position, thereby restoring to the standby state.

[0093] Figure 4 It is an operation state diagram showing other examples of the operation of the car of this embodiment during a power outage and when power is restored.

[0094] During a power outage, the car 1 travels in the upward direction. Therefore, similar to the example of Figure 3 , the electric operator 10 operates, but in fact, the braking member in the emergency braking device 2 does not bite into the guide rail 4. Therefore, when power is restored, the restoration operation of the electric operator 10 is performed without operating the car 1.

[0095] Figure 5 It is a flowchart showing the processing operation of the safety control device 103 in this embodiment during a power outage. Refer to Figure 2 for appropriate explanation.

[0096] The safety control device 103 in this embodiment has a computer system such as a microcomputer. This computer system executes a prescribed program, whereby the safety control device 103 performs processing during a power outage.

[0097] In step S301, the safety control device 103 determines whether the power supply voltage for the electromagnets 35a and 35b of the electric operator 10 is less than a prescribed threshold value. Thereby, the safety control device 103 detects the occurrence of a power outage.

[0098] In this embodiment, the safety control device 103 detects the DC output voltage of the DC power supply 300. The safety control device 103 determines whether the detected value of the DC output voltage is less than a prescribed threshold value.

[0099] When the safety control device 103 determines that the power supply voltage is less than the prescribed threshold value (step S301 is), that is, when it determines that a power outage has occurred, it then executes step S302. When the safety control device 103 determines that the power supply voltage is not less than the prescribed threshold value (step S301 is no), that is, when it determines that no power outage has occurred, it executes step S301 again and continues to monitor the power supply voltage.

[0100] In step S302, the safety control device 103 uses the non-volatile storage device 130 to store the data of the traveling direction, speed, and position of the car 1, that is, the data related to the traveling state of the car 1, and holds the data. During the power outage, the safety control device 103 successively detects the traveling state by the stored power of the battery 111 and writes the data into the non-volatile storage device 130.

[0101] Next, in step S303, the safety control device 103 cuts off the power supply from the battery 111 to the electromagnets 35a and 35b, causing the electric actuator 10 to operate. At this time, similar to the case where the second overspeed is detected, the safety control device 103 outputs disconnection commands to the electric contact points 104a, 105a, 104b, and 105b respectively.

[0102] If the voltage of the battery 111 drops due to a power outage, the electric actuator 10 operates. At this time, the power supply from the battery 111 to the safety control device 103 and the speed sensors (5, 6) also disappears. Therefore, the safety control device 103 cannot detect the running state of the car 1. In contrast, according to step S303, by cutting off the power supply to the electromagnets 35a and 35b, the remaining stored power in the battery 111 can be used to continue the operation of the safety control device 103 or the speed sensors (5, 6). Therefore, during the period from the occurrence of the power outage until the car 1 is braked and stopped by the braking device 202, the safety control device 103 can detect the running state of the car 1 and write data to the non-volatile storage device 130.

[0103] In this way, during a power outage, the safety control device 103 detects the running state of the car 1 and holds the detected data. Thus, when the power supply is restored, the elevator control device 7 can use the data held by the safety control device 103 to restart the operation of the car 1.

[0104] Moreover, in this embodiment, as described below, the elevator control device 7 uses the data held by the safety control device 103 to restore the electric actuator 10 that operates during a power outage.

[0105] Figure 6 It is a flowchart showing the processing operation of the elevator control device 7 in this embodiment for restoring the electric actuator 10. For appropriate reference Figure 2 An explanation will be given.

[0106] The elevator control device 7 in this embodiment independently has a computer system such as a microcomputer from the safety control device 103. By executing a prescribed program by this computer system, the elevator control device 7 executes the restoration process of the electric actuator 10.

[0107] When commercial three-phase AC power supply 400 supplies power to the elevator device, the elevator control device 7 determines in step S401 whether the movable member detection switch 109 is turned off. That is, the elevator control device 7 determines whether the electric operator 10 is operating. When the elevator control device 7 determines that the movable member detection switch 109 is not turned off and the electric operator 10 is not operating (No in step S401), it ends the recovery process of the electric operator 10. When the elevator control device 7 determines that the movable member detection switch 109 is turned off and the electric operator 10 is operating (Yes in step S401), it then executes step S402.

[0108] In step S402, the elevator control device 7 determines whether data related to the traveling state of the car 1 during a power outage, that is, data on the traveling direction, speed, and position, is stored in the non-volatile storage device 130 in the safety control device 103. Therefore, in step S402, the elevator control device 7 determines whether the above-mentioned ( Figure 5 ) power outage process performed by the safety control device 103 has been executed.

[0109] For example, if the elevator control device 7 can obtain data from the non-volatile storage device 130, it determines that the data is stored; if it cannot obtain the data, it determines that the data is not stored.

[0110] When the elevator control device 7 determines that the data on the traveling direction, speed, and position is not stored (No in step S402), it skips steps S403 and S404 and then executes step S405. In this case, it is presumed that the electric operator 10 is not related to the power outage and operates for emergency stop. Therefore, in step S405, the elevator control device 7 reports an abnormality to the monitoring server 801 provided in the control center 800 using the monitoring device 600 and sets the elevator device to a standby state.

[0111] When the elevator control device 7 determines that the data on the traveling direction, speed, and position is stored (Yes in step S402), it then executes step S403.

[0112] In step S403, based on the data related to the traveling state of the car 1 obtained from the non-volatile storage device 130 of the safety control device 103, the elevator control device 7 determines whether the traveling direction of the car 1 at the time of power outage is the downward direction, that is, the traveling direction in which the braking member of the emergency braking device 2 may bite into the guide rail 4. The traveling direction in which the braking member of the emergency braking device 2 may bite into the guide rail 4 means the traveling direction in which the recovery operation of the electric operator 10 may become difficult.

[0113] When the elevator control device 7 determines that the traveling direction is the downward direction and the restoration operation of the electric operator 10 may become difficult (Yes in step S403), step S404 is then executed. In addition, when the elevator control device 7 determines that the traveling direction is not the downward direction, that is, the upward direction or the car 1 has stopped and the electric operator 10 can perform the restoration operation (No in step S403), step S406 is then executed.

[0114] In step S404, the elevator control device 7 determines whether the speed of the car 1 at the time of power failure is equal to or higher than a specified threshold value based on the data related to the traveling state of the car 1 obtained from the non-volatile storage device 130 of the safety control device 103. At this time, the elevator control device 7 determines whether the biting of the brake member of the emergency braking device 2 that has been operated by the electric operator 10 into the guide rail 4 is large and whether the restoration operation of the electric operator 10 is difficult.

[0115] When the elevator control device 7 determines that the speed of the car 1 is equal to or higher than the threshold value (Yes in step S404), that is, when it determines that the restoration operation of the electric operator 10 is difficult, step S405 is then executed. In S405, the elevator control device 7 reports an abnormality to the monitoring server 801 provided in the control center 800 using the monitoring device 600, and sets the elevator device to a standby state.

[0116] In addition, when the elevator control device 7 determines that the speed of the car 1 is not equal to or higher than the threshold value (No in step S404), that is, when it determines that the electric operator 10 can perform the restoration operation, step S406 is then executed.

[0117] In step S406, the elevator control device 7 determines whether the current position of the car 1 is lower than the position of the car 1 before power failure stored in the non-volatile storage device 130 based on the data related to the traveling state of the car 1 obtained from the non-volatile storage device 130 of the safety control device 103.

[0118] In addition, in the present embodiment, the elevator control device 7 uses the stop position of the car 1 at the time of power failure stored in the non-volatile storage device 130 as the current position of the car 1. In addition, when there are multiple pieces of position data before stopping, the position before stopping of the car 1 at the time of power failure is the position indicated by one of the multiple pieces of data. Therefore, in step S406, the elevator control device 7 determines whether the car has descended during the power failure.

[0119] After the emergency braking device 2 is operated by the electric operator 10 and the car 1 descends, the braking member of the emergency braking device 2 bites into the guide rail 4. When the biting of the braking member occurs, before the electric operator 10 is restored, it is necessary to operate the emergency braking device 2 in the upward direction to release the biting of the braking member, that is, the operating state of the emergency braking device 2. Therefore, in step S406, the elevator control device 7 determines whether the car 1 descends during a power outage, and determines whether the car 1 operates in the upward direction before the electric operator 10 is restored.

[0120] When the elevator control device 7 determines that the current position of the car 1 is below a position before the car 1 stops during a power outage stored in the non-volatile storage device 130 (step S406 is), that is, when it is determined that the car 1 needs to operate in the upward direction, step S407 is then executed. In addition, when the elevator control device 7 determines that the current position of the car 1 is not below a certain position before the car 1 stops during a power outage stored in the non-volatile storage device 130 (step S406 is no), that is, when it is determined that the car 1 does not need to operate in the upward direction, step S407 is skipped and step S408 is then executed.

[0121] In step S407, the elevator control device 7 operates the car 1 to rise (UP). At this time, the elevator control device 7 controls the upward operation of the car 1 according to the position of the car 1 stored in the non-volatile storage device 130.

[0122] In this embodiment, the elevator control device 7 operates the car 1 to rise (UP) to a position higher than the current position (the stop position stored in the non-volatile storage device 130 in this embodiment), for example, a position as described above (step S406) or the position with the highest height from the current position, and then stops the car 1. Thus, the operating state of the emergency braking device 2 can be reliably released.

[0123] After the elevator control device 7 executes step S407, step S408 is then executed.

[0124] In step S408, as described above, the elevator control device 7 uses the motor control device 112 to rotate the restoration motor ( Figure 2 the motor 37 therein) forward and backward, thereby restoring the electric operator 10 to the standby state.

[0125] As described above, according to this embodiment, the safety control device 103 that controls the electric actuator 10 to operate the emergency braking device 2 detects and stores the traveling state of the car 1 during a power outage. When the power supply is restored, the elevator control device 7 restores the electric actuator 10 to the standby state according to the traveling state of the car 1 stored in the safety control device 103. Thus, even if the electric actuator 10 operates due to a power outage, the elevator device can be smoothly restored when the power supply is restored.

[0126] In addition, in the above embodiment, the safety control device 103 detects and stores the traveling state of the car 1 during a power outage, but a control device for detecting the traveling state during a power outage may be provided independently of the safety control device 103. In addition, since the safety control device 103 has a function of urgently stopping the car 1 according to the traveling state of the car 1, even if it further has a function of performing Figure 5 the power outage processing as shown, the number of components such as a microcomputer will not increase.

[0127] The present invention is not limited to the above embodiments and also includes various modification examples. For example, the above embodiments are examples described in detail for easy understanding of the present invention and do not have to be limited to having all the structures described. In addition, for a part of the structure of the embodiment, other structures can be added, deleted, or replaced.

[0128] For example, other position detection sensors can be applied instead of the movable member detection switch 109, such as a photoelectric position sensor, a magnetic position sensor, a proximity sensor (capacitive type, inductive type), etc.

[0129] In addition, the electric actuator 10 can be provided not only above the car 1 but also below or on the side of the car 1.

[0130] In addition, the elevator device may have a machine room or may be a so-called machine-roomless elevator without a machine room.

[0131] Symbol Explanation

[0132] 1…Carriage, 2…Emergency braking 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…Fixed part, 15…Pressing member, 16…First working piece, 17…Connecting piece, 18…Second working piece, 19…First working shaft, 20…Second working shaft, 21…Lifting rod, 30…Housing, 34a…Adsorption part, 34b…Supporting part, 34c…Cam part, 35a, 35b…Electromagnet, 36…Feed screw, 37…Motor, 38…Connecting bracket, 39…Electromagnet support plate, 41…Supporting member, 50…Crosshead, 103…Safety control device, 104a, 105a, 104, 105b…Electric contact, 106a, 106b…Signal line, 107a, 107b…Fuse, 109…Movable part detection switch, 111…Battery, 112…Motor control device, 200…Hoist, Motor…201, Braking device…202, 300…DC power supply, 400…Commercial three-phase AC power supply, 500…Commercial single-phase AC power supply, 600…Monitoring device, 700…Communication network, 800…Control center, 801…Monitoring server.

Claims

1. An elevator device, comprising: a car; an emergency braking device provided in the car; and an electric operator that operates the emergency braking device, characterized in that the elevator device has: a first control device that detects and stores the running state of the car during a power outage; and a second control device that returns the electric operator that operates during the power outage to a standby state according to the running state stored by the first control device.

2. The elevator device according to claim 1, characterized in that the second control device makes the car run in the upward direction before returning the electric operator to the standby state according to the running state.

3. The elevator device according to claim 1, characterized in that the running state includes the running direction and speed of the car, and the second control device returns the electric operator to the standby state according to the running direction and the speed.

4. The elevator device according to claim 3, characterized in that when the running direction is not the downward direction, and when the running direction is the downward direction and the speed is less than a specified threshold value, the second control device returns the electric operator to the standby state.

5. The elevator device according to claim 2, characterized in that the running state includes the position of the car, and the second control device makes the car run in the upward direction before returning the electric operator to the standby state according to the position.

6. The elevator device according to claim 5, characterized in that when the current position of the car is below a position during the power outage, the second control device makes the car run in the upward direction.

7. The elevator device according to claim 2, characterized in that the running state includes the running direction, speed and position of the car, the second control device returns the electric operator to the standby state according to the running direction and the speed, and the second control device makes the car run in the upward direction before returning the electric operator to the standby state according to the position.

8. The elevator device according to claim 1, characterized in that during the power outage, power from a battery is supplied to the first control device.

9. The elevator device according to claim 8, characterized in that the power from the battery is supplied to the electric operator, and the first control device cuts off the power supply to the electric operator during the power outage to make the electric operator work.

10. The elevator device according to claim 1, characterized in that the electric operator has an electromagnet, and the electric operator operates when the electromagnet is demagnetized.

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