Elevator device

Abstract

The invention discloses an elevator device capable of improving the reliability of an emergency stop device operated by an operation mechanism provided with a magnet part. This elevator device is provided with: an elevator car (3); and an emergency stop system having an emergency stop device (20) provided in the elevator car and an operating mechanism (30) for operating the emergency stop device, the elevator car being lifted while being guided by the guide rails (5A, 5B), the operating mechanism having: an operating lever connected to a brake provided in the emergency stop device; and a magnet part which is arranged on the operation rod, the operation mechanism enables the magnet part to be attracted to the guide rail when the emergency stop device is operated, the emergency stop system is provided with a permanent magnet part (51), and a magnetic pole part of the permanent magnet part is exposed in the lifting channel.

Description

Technical Field

[0001] The present invention relates to an elevator device provided with an emergency stop device which operates electrically. Background Art

[0002] In an elevator device, a speed governor and an emergency stop device are provided in order to always monitor the lifting speed of the elevator car and to stop the elevator car in an emergency if it falls into a prescribed overspeed state. Usually, the elevator car and the speed governor are connected by a speed governor rope. When an overspeed state is detected, the speed governor brakes the speed governor rope, thereby lifting the brake of the emergency stop device on the elevator car side. As a result, the emergency stop device is activated and the elevator car stops in an emergency.

[0003] In such an elevator device, since the speed governor rope as a long object is laid in the hoistway, it is difficult to save space and reduce costs. In addition, when the speed governor rope vibrates, the structure in the hoistway and the speed governor rope are prone to interfere.

[0004] On the other hand, an emergency stop device which does not use a speed governor sling has been proposed.

[0005] As a conventional technology related to an emergency stop device that does not use a speed governor sling, the technology described in Patent Document 1 is known.

[0006] In this prior art, an operating mechanism for actuating an emergency stop device is provided in an elevator car. The operating mechanism includes an operating rod connected to a brake member and an electromagnet portion for actuating the operating rod. The operating rod includes a permanent magnet portion.

[0007] Normally, since the permanent magnet portion is attracted by the electromagnet portion, the brake element is fixed to the elevator car via the operating rod.

[0008] In an emergency, the current flowing through the electromagnet is controlled so that the electromagnet generates a repulsive force. As a result, the permanent magnet moves away from the electromagnet and is attracted to the guide rail. As a result, the brake is released from the elevator car and fixed to the guide rail via the operating lever. At this time, as the elevator car continues to descend, the brake is lifted relative to the elevator car.

[0009] Prior art literature

[0010] Patent Literature

[0011] Patent Document 1: U.S. Patent Application Publication No. 2020 / 0048042 Summary of the invention

[0012] Problems to be solved by the invention

[0013] In the above-mentioned prior art, magnetic foreign matter such as magnetic dust such as iron powder adheres to the adsorption surface of the permanent magnet part, and in an emergency, the adsorption force between the permanent magnet and the guide rail may be reduced. Therefore, the reliability of the emergency stop device may be reduced.

[0014] Therefore, the present invention provides an elevator device capable of improving the reliability of an emergency stop device operated by an operating mechanism including a magnet portion.

[0015] Means for solving problems

[0016] In order to solve the above-mentioned problems, the elevator device of the present invention comprises: an elevator car; and an emergency stop system, which has an emergency stop device installed in the elevator car and an operating mechanism for actuating the emergency stop device. The elevator car is raised and lowered while being guided by a guide rail, wherein the operating mechanism comprises: an operating rod connected to a brake member provided in the emergency stop device; and a magnet portion installed on the operating rod. When the operating mechanism actuates the emergency stop device, the magnet portion is adsorbed on the guide rail. The emergency stop system has a permanent magnet portion, and the magnetic pole portion of the permanent magnet portion is exposed in the lifting channel.

[0017] Effects of the Invention

[0018] According to the present invention, since the permanent magnet portion attracts magnetic foreign matter, the reliability of the emergency stop device is improved.

[0019] Other problems, structures, and effects than those described above will become clear from the following description of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of an elevator device as an embodiment.

[0021] Figure 2 1 is a structural diagram showing the mechanical structure of the emergency stop device and the operating mechanism in this embodiment.

[0022] Figure 3 yes Figure 2 A top view of the emergency stop device 20 in FIG.

[0023] Figure 4 It is a structural diagram showing the positional relationship between the permanent magnet portion and the electromagnet portion in the embodiment.

[0024] Figure 5 It is a structural diagram showing the operation of the emergency stop device and the operating mechanism in an emergency in the embodiment.

[0025] Figure 6 It is a structural diagram showing the appearance of an operating mechanism in an elevator apparatus as a first modified example.

[0026] Figure 7It is a structural diagram showing the mechanical structure of a permanent magnet portion and an electromagnet portion in an elevator device as a second modified example.

[0027] Figure 8 yes Figure 7 30 in a top view. DETAILED DESCRIPTION

[0028] Hereinafter, an elevator device as one embodiment of the present invention will be described based on an embodiment with reference to the drawings. It should be noted that in each of the drawings, the same structure as the reference numeral represents the same component or a component having a similar function.

[0029] Figure 1 This is a schematic structural diagram of an elevator device as one embodiment of the present invention.

[0030] The elevator device has a hoisting machine installed on the upper part of the hoisting passage. An elevator car 3 is connected to one end of a main rope 2 wound around a traction wheel 1 of the hoisting machine and a direction conversion pulley 8, and a counterweight 4 is connected to the other end of the main rope 2.

[0031] The elevator car 3 is suspended by the main rope 2 in the hoistway. When the hoist is driven by the motor and the traction sheave 1 rotates, the main rope 2 is driven. As a result, the elevator car 3 is raised and lowered in the hoistway along a pair of elevator car guide rails 5A and 5B provided in the hoistway. In addition, the counterweight 4 is raised and lowered in the hoistway in the opposite direction to the elevator car 3 along a pair of counterweight guide rails 6A and 6B provided in the hoistway.

[0032] An emergency stop device 20 and an operating mechanism 30 are arranged at the lower part of the elevator car 3. The emergency stop device 20 stops the elevator car 3 from rising and falling by clamping the elevator car guide rails 5A and 5B with brakes (described later) in an emergency, and the operating mechanism 30 activates the emergency stop device 20. It should be noted that in the present embodiment, one emergency stop device 20 is provided on the left and right sides of the lower part of the elevator car 3. In addition, the operating mechanism 30 is provided below the emergency stop device 20, and one operating mechanism 30 is provided on the left and right sides of the lower part of the elevator car 3.

[0033] like Figure 1 As shown in the A-direction view recorded in the figure, in the emergency stop system composed of the emergency stop device 20 and the operating mechanism 30, the emergency stop device 20 and the operating mechanism 30 are arranged side by side in the vertical direction. In this embodiment, the operating mechanism 30 is located below the emergency stop device 20. A permanent magnet sheet 51 is arranged on the upper part of the emergency stop system, in this embodiment, on the upper part of the emergency stop device 20.

[0034] The magnetic pole surface of the permanent magnet piece 51 is exposed in the lifting passage. Thus, the permanent magnet piece 51 attracts magnetic foreign matter such as magnetic dust such as iron powder relatively close to the upper part of the emergency stop device 20 in the lifting passage. Thus, the intrusion of magnetic foreign matter into the emergency stop device 20 and the operating mechanism 30 can be suppressed.

[0035] In addition, as shown in the view in the direction of arrow A, the side portion of the operating mechanism 30 is covered by the cover member 40. This can suppress the intrusion of foreign matter including magnetic foreign matter into the operating mechanism.

[0036] The speed detection device (not shown) is arranged in the elevator car 3 and always detects the lifting speed of the elevator car 3 in the lifting passage. Therefore, the lifting speed of the elevator car 3 exceeding the prescribed overspeed can be detected by the speed detection device.

[0037] For example, the speed detection device includes an image sensor, and detects the speed of the elevator car 3 based on image information of the surface state of the elevator car guide rail 5A or 5B obtained by the image sensor. It should be noted that the speed detection device can also be provided in the elevator car 3, and the speed of the elevator car 3 is calculated based on the output signal of the rotary encoder that rotates with the movement of the elevator car 3.

[0038] The elevator device of this embodiment is equipped with a so-called ropeless speed governor system that does not use a speed governor rope. When the lifting speed of the elevator car 3 exceeds the rated speed and reaches a first overspeed (for example, a speed not exceeding 1.3 times the rated speed), the power supply of the motor of the hoist and the power supply of the control device that controls the motor are cut off. In addition, when the lifting speed of the elevator car 3 reaches a second overspeed (for example, a speed not exceeding 1.4 times the rated speed), the emergency stop device 20 provided in the elevator car 3 is actuated to cause the elevator car 3 to stop urgently.

[0039] In this embodiment, the ropeless speed governor system is composed of the aforementioned speed detection device and a safety control device (not shown), and the safety control device determines the overspeed state of the elevator car 3 based on the output signal of the speed detection device. The safety control device measures the speed of the elevator car 3 based on the output signal of the speed detection device, and when it is determined that the measured speed has reached a first overspeed, it outputs a command signal for cutting off the power supply of the motor of the hoisting machine and the power supply of the control device for controlling the motor. In addition, when it is determined that the measured speed has reached a second overspeed, the safety control device outputs a command signal for operating the operating mechanism 30.

[0040] Figure 2 2 is a structural diagram showing the mechanical structure of the emergency stop device 20 and the operating mechanism 30 in this embodiment. It should be noted that: Figure 2 Equivalent to Figure 1(A direction view) is a partial enlarged view. It should be noted that Figure 1 The cover member 40 in Figure 2 Not shown in the figure ( Figure 5 , 7 Same thing).

[0041] Figure 2 The emergency stop device 20 in the elevator is in a non-operating state. That is, the elevator car 3 is in a normal operating state.

[0042] In an emergency, a pair of wedge-shaped brake members 22 in the emergency stop device 20 are moved from the frame 21 by the operating mechanism 30. Figure 2 The non-braking position shown is moved toward a braking position above the non-braking position.

[0043] The brake piece 22 is sandwiched and pressed by a pair of guide members 23 fixed in the frame body 21 at the braking position.

[0044] The operating mechanism 30 includes an operating rod 34 for operating a pair of brake members 22, and an electromagnet portion 33 for operating the operating rod 34. One end of the operating rod 34 is rotatably connected to the permanent magnet portion 32. The other end of the operating rod 34 is rotatably connected to one of the pair of brake members 22. It should be noted that the electromagnet portion 33 is fixed in the frame 31.

[0045] The permanent magnet part 32, the electromagnet part 33 and the operating rod 34 are located on one side of the left and right sides of the elevator car guide rail 5A in the frame 31. In addition, the permanent magnet part 32 is located between the electromagnet part 33 and the elevator car guide rail 5A. The brake 22 connected to the operating rod 34 is located on one side of the left and right sides of the elevator car guide rail 5A together with the permanent magnet part 32, the electromagnet part 33 and the operating rod 34.

[0046] The pair of brake members 22 are connected to each other via a connecting member 36. The connecting member 36 is connected to each brake member 22 via a connecting pin. As a result, the pair of brake members 22 operate in an integrated manner. The operating rod 34 is rotatably connected to one of the pair of brake members 22 via a connecting pin. The operating rod 34 extends downward from the connection portion with the brake member 22 and is rotatably connected to the permanent magnet portion 32 located directly below the brake member 22 to which the operating rod 34 is connected.

[0047] like Figure 2 As shown, in the non-operating state of the emergency stop device 20, the permanent magnet portion 32 is attracted by the electromagnet portion 33. Therefore, the permanent magnet portion 32 is away from the elevator car guide rail 5A, so there is a gap between the permanent magnet portion 32 and the elevator car guide rail 5A. Therefore, in combination with the fact that the permanent magnet portion 32 can rotate around the connection portion between the brake member 22 and the operating rod 34 together with the operating rod 34, the permanent magnet portion 32 can move between the electromagnet portion 33 and the elevator car guide rail 5A.

[0048] In the frame 31, a sliding member 37 made of a low friction material such as resin is provided on one side of the left and right sides of the elevator car guide rail 5A opposite to the side where the permanent magnet portion 32 is arranged. The sliding member 37 can support the elevator car guide rail 5A in an emergency when the permanent magnet portion 32 is repelled by the electromagnet portion 33 and collides with the elevator car guide rail 5A.

[0049] In this embodiment, a plate-shaped or sheet-shaped permanent magnet piece 51 is fixedly installed adjacent to the elevator car guide rail 5A on the upper part of the frame 21 of the emergency stop device 20. It should be noted that a gap is provided between the permanent magnet piece 51 and the elevator car guide rail 5A in such a manner that the permanent magnet piece 51 and the elevator car guide rail 5A do not contact each other when the elevator car 3 is moving or stopped.

[0050] A pair of front and back flat surfaces perpendicular to the thickness direction of the permanent magnet piece 51 constitute magnetic pole surfaces. One flat surface is fixed to the upper portion of the frame 21, and the other flat surface is exposed in the lifting passage.

[0051] Figure 3 yes Figure 2 It is a top view of the emergency stop device 20 in FIG. It should be noted that in the figure, a T-shaped cross section is shown for the elevator car guide rail.

[0052] like Figure 3 As shown, the permanent magnet pieces 51 are provided on both sides of the head of the T-shaped elevator car guide rail 5A passing through the notch of the frame 21, adjacent to the notch and the head of the elevator car guide rail 5A.

[0053] In this embodiment, the permanent magnet piece 51 is placed on the frame 21 in such a manner that the flat surface of the permanent magnet piece 51 contacts the upper surface of the frame 21 of the emergency stop device 20. Figure 4 As shown, the flat surface of the permanent magnet piece 51 may cover a part of the notch.

[0054] It should be noted that various magnets such as metal magnets, resin magnets, and rubber magnets can be applied as the permanent magnet pieces 51 .

[0055] Figure 4 1 is a structural diagram showing the positional relationship between the permanent magnet portion 32 and the electromagnet portion 33 in this embodiment.

[0056] The electromagnet part 33 includes a magnetic core 33a and coils 33b disposed above and below the magnetic core 33a. One of the two magnetic pole faces of the magnetic core 33a faces one of the two magnetic pole faces of the permanent magnet part 32. The other magnetic pole face of the permanent magnet part 32 faces Figure 3 The sides of the elevator car guide rails not shown in the figure are opposite.

[0057] Figure 5 2 is a structural diagram showing the operation of the emergency stop device 20 and the operating mechanism 30 in this embodiment in an emergency. It should be noted that the operation state changes along the arrows in the figure.

[0058] As shown in the left figure, the brake member 22 is normally located in the non-braking position of the lower part of the emergency stop device 20 away from the guide member 23. The permanent magnet portion 32 is attracted to the magnetic pole surface of the electromagnet portion 33 by the electromagnetic force generated by the electromagnet portion 33. Therefore, the position of the brake member 22 is maintained in the non-braking position in the emergency stop device 20 fixed to the elevator car 3. That is, the brake member 22 is fixed to the elevator car 3 via the operating rod 34.

[0059] It should be noted that the coil 33b ( Figure 4 ) is normally energized in such a way as to attract the permanent magnet portion 32.

[0060] As described above, when the safety control device determines that the descending speed of the elevator car 3 has reached the second overspeed (for example, a speed not exceeding 1.4 times the rated speed), it outputs a command signal for operating the operating mechanism 30. When the control device of the electromagnet portion 33 receives the command signal, it causes the current to flow through the coil 33b in the opposite direction to the normal direction ( Figure 4 ). As a result, the permanent magnet portion 32 receives a repulsive force from the electromagnet portion 33 and moves from the electromagnet portion 33 to the elevator car guide rail 5A. Therefore, as shown in the center figure, the permanent magnet portion 32 is attracted to the elevator car guide rail 5A by the magnetic force of the permanent magnet portion 32.

[0061] Therefore, the fixing of the brake member 22 to the elevator car 3 is released, and the brake member 22 is fixed to the elevator car guide rail 5A via the operating rod 34 .

[0062] In the state where the brake member 22 is fixed to the elevator car guide rail 5A, the elevator car 3 continues to descend, so the brake member 22 is relatively pushed up from the non-braking position (center figure) at the bottom of the emergency stop device 20 to the braking position clamped by the pair of guide members 23 as shown in the right figure. The pair of brake members 22 are clamped by the pair of guide members 23 at the braking position, thereby clamping the elevator car guide rail 5A. Thus, the elevator car 3 is braked by the friction force generated between each brake member 22 and the elevator car guide rail 5A.

[0063] The permanent magnet piece 51 is in contact with the frame body ( Figure 2 , 3Magnetic foreign matter is adsorbed at the notch portion of the upper surface of the elevator car guide rail 5A through which the elevator car guide rail 5A passes and at a position adjacent to the elevator car guide rail 5A. This can prevent magnetic foreign matter from entering the operating mechanism 30 via the emergency stop device 20. Therefore, the attachment of magnetic foreign matter to the magnetic pole surface of the permanent magnet portion 32 of the operating mechanism 30 is prevented.

[0064] This can prevent a decrease in the attraction force when the permanent magnet portion 32 is attracted to the elevator car guide rail 5A as described above. Therefore, the reliability of the operation of the emergency stop device 20 is improved.

[0065] Figure 6 1 is a structural diagram showing the appearance of an operating mechanism in an elevator device as a first variant of this embodiment. Figure 6 and Figure 1 (Viewed in the direction of A) corresponds to the local enlarged view.

[0066] In this modification, in addition to the permanent magnet pieces 51 in the aforementioned embodiment, a plate-like or sheet-like permanent magnet piece 52 is fixedly provided on the outer surface of the dustproof cover member 40 covering the side of the operating mechanism 30. The permanent magnet pieces 52 are provided on both sides of the elevator car guide rail 5A passing through the central part of the frame 31, respectively, along the longitudinal direction of the elevator car guide rail 5A, so as to be adjacent to the elevator car guide rail 5A.

[0067] A pair of front and back flat surfaces perpendicular to the thickness direction of the permanent magnet piece 51 constitute magnetic pole surfaces. One flat surface is fixed to the outer surface of the cover member 40, and the other flat surface is exposed in the lifting passage.

[0068] According to this modification, similarly to the aforementioned permanent magnet piece 51, the permanent magnet piece 52 absorbs magnetic foreign matter, thereby being able to suppress the intrusion of magnetic foreign matter from the side of the operating mechanism 30 into the operating mechanism 30. Therefore, it is possible to suppress the attachment of magnetic foreign matter to the magnetic pole surface of the permanent magnet portion 32 of the operating mechanism 30, thereby improving the reliability of the operation of the emergency stop device 20.

[0069] Figure 7 It is a structural diagram showing the mechanical structure of a permanent magnet portion and an electromagnet portion in an elevator device as a second modified example of the present embodiment.

[0070] In this modified example, the operating mechanism 30 is disposed above the emergency stop device 20. It should be noted that the structures of the emergency stop device 20 and the operating mechanism 30 are the same as those of the above-mentioned embodiment ( Figure 2 )same.

[0071] In this modification, when the permanent magnet portion 32 and the electromagnet portion 33 operate in an emergency as in the embodiment, the brake member 22 is relatively lifted from the non-braking position at the bottom of the emergency stop device 20 to the braking position sandwiched by the guide member 23 .

[0072] In this embodiment, a plate-shaped or sheet-shaped permanent magnet piece 53 is fixedly installed adjacent to the elevator car guide rail 5A on the upper part of the frame 31 of the operating mechanism 30. It should be noted that a gap is provided between the permanent magnet piece 53 and the elevator car guide rail 5A in such a manner that the permanent magnet piece 53 and the elevator car guide rail 5A do not contact each other when the elevator car 3 is moving or stopped.

[0073] A pair of front and back flat surfaces perpendicular to the thickness direction of the permanent magnet piece 53 constitute magnetic pole surfaces. One flat surface is fixed to the upper portion of the frame 31, and the other flat surface is exposed in the lifting passage.

[0074] Figure 8 yes Figure 7 30 in a top view.

[0075] like Figure 8 As shown, the permanent magnet pieces 53 are provided on both sides of the head of the T-shaped elevator car guide rail 5A passing through the notch of the frame 31, adjacent to the notch and the head of the elevator car guide rail 5A.

[0076] In this modification, the plate-shaped permanent magnet piece 53 is placed on the frame 31 so that the flat surface of the permanent magnet piece 53 contacts the upper surface of the frame 31 of the operating mechanism 30. The flat surface of the permanent magnet piece 53 may cover a part of the notch.

[0077] According to the above-mentioned embodiment, by providing a permanent magnet piece with a magnetic pole surface exposed in the lifting channel in the emergency stop system composed of the emergency stop device 20 and the operating mechanism 30 of the emergency stop device 20, magnetic foreign matter is prevented from intruding into the operating mechanism 30. As a result, the reliability of the operation of the emergency stop device 20 is improved.

[0078] It should be noted that according to the research of the inventors, most magnetic foreign objects fall from the top of the elevator car, or approach the elevator car from the top of the elevator car as the elevator car moves. Figure 2 )、Second Modification Example( Figure 7 ) By providing a permanent magnet sheet on the upper part of the emergency stop system composed of the operating mechanism 30 of the emergency stop device 20, it is possible to more reliably prevent magnetic foreign matter from intruding into the operating mechanism 30.

[0079] It should be noted that the present invention is not limited to the aforementioned embodiments, and includes various modifications. For example, the aforementioned embodiments are described in detail to explain the present invention in an easy-to-understand manner, but are not necessarily limited to having all the structures described. In addition, other structures can be added, deleted, or replaced to a part of the structure of the embodiment.

[0080] For example, the permanent magnet pieces 51, 52, and 53 may be detachably provided. This facilitates replacement of the permanent magnet pieces 51 and 52 during maintenance. Alternatively, only the permanent magnet piece 52 may be provided out of the permanent magnet pieces 51 and 52 in the first modified example.

[0081] In addition, an electromagnet portion may be used instead of the permanent magnet portion 32 in the operating mechanism 30. In addition, the permanent magnet portion 32 and the electromagnet portion 33 may be used as the electromagnet portion and the permanent magnet portion, respectively.

[0082] In addition, the elevator apparatus may have a machine room, or may be a so-called machine room-less elevator.

[0083] Description of reference numerals:

[0084] 1…traction sheave, 2…main rope, 3…elevator car, 4…counterweight, 5A, 5B…guide rails for elevator car, 6A, 6B…guide rails for counterweight, 8…direction change pulley, 20…emergency stop device, 21…frame, 22…brake member, 23…guide member, 30…operating mechanism, 31…frame, 32…permanent magnet portion, 33…electromagnet portion, 33a…magnetic core, 33b…coil, 34…operating rod, 35…connecting pin, 36…connecting member, 37…sliding member, 40…cover member, 51, 52, 53…permanent magnet pieces.

Claims

1. An elevator device, comprising: elevator cars; and An emergency stop system includes an emergency stop device provided in the elevator car and an operating mechanism for actuating the emergency stop device. The elevator car is guided by the guide rails while ascending and descending in the elevator passage. It is characterized in that The operating mechanism has: an operating lever connected to a brake member provided in the emergency stop device; and a magnet portion, which is provided on the operating rod, When the emergency stop device is activated, the operating mechanism causes the magnet portion to be attracted to the guide rail. The emergency stop system includes a permanent magnet portion, and a magnetic pole portion of the permanent magnet portion is exposed in the lifting passage.

2. The elevator device according to claim 1, characterized in that: The permanent magnet portion is disposed on an upper portion of the emergency stop system.

3. The elevator device according to claim 2, characterized in that: The emergency stop device and the operating mechanism are arranged side by side in the vertical direction.

4. The elevator device according to claim 3, characterized in that: The operating mechanism is located below the emergency stop device. The permanent magnet portion is disposed on an upper portion of the emergency stop device.

5. The elevator device according to claim 3, characterized in that: The operating mechanism is located above the emergency stop device. The permanent magnet portion is arranged on the upper portion of the operating mechanism.

6. The elevator device according to claim 1, characterized in that: The operating mechanism has a cover member that covers a side portion of the operating mechanism.

7. The elevator device according to claim 6, characterized in that: The cover member includes the permanent magnet portion.

8. The elevator device according to claim 6, characterized in that: The cover member has another permanent magnet portion.

9. The elevator device according to claim 1, characterized in that: The permanent magnet portion is adjacent to the guide rail.

10. The elevator device according to claim 1, characterized in that: The operating mechanism includes an electromagnet portion, The magnet portion is normally attracted by the electromagnet portion and is away from the guide rail. When the emergency stop device is actuated, the magnet portion moves toward the guide rail due to the repulsive force generated by the electromagnet portion and is attracted to the guide rail.

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