WO2023047561A1

WO2023047561A1 - Elevator device

Info

Publication number: WO2023047561A1
Application number: PCT/JP2021/035262
Authority: WO
Inventors: 洋輔久保; 秀隆座間; 康司伊藤; 智久早川
Original assignee: 株式会社日立製作所
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2023-03-30
Also published as: JPWO2023047561A1; CN117940361A

Abstract

Disclosed is an elevator device with an electric emergency stop device, which enables reduction in occupied space and is suitable for space saving. This elevator device comprises: a car (1); an emergency stop device (2) that is provided to the car; a drive mechanism (12 to 17) that is provided to the car and operates the emergency stop device; and an electric actuator (10) that operates the drive mechanism. The drive mechanism has a drive rod (12) that is connected to the emergency stop device and that operates the emergency stop device. The drive rod has a torsion spring portion (13), and when the electric actuator operates, the drive rod is rotated by the biasing force of the torsion spring portion, and the rotation of the drive rod causes the emergency stop device to operate.

Description

elevator equipment

The present invention relates to an elevator apparatus equipped with an electrically operated safety device.

The elevator system is equipped with a governor and an emergency stop device to constantly monitor the ascending and descending speed of the car and to emergency stop the car that has fallen into a predetermined overspeed condition. In general, the car and the governor are connected by a governor rope, and when an overspeed condition is detected, the governor restrains the governor rope and activates the emergency stop device on the car side to bring the car to an emergency stop. there is

In such an elevator system, it is difficult to save space and reduce costs because a long governor rope is laid in the hoistway. In addition, when the governor rope swings, the structures in the hoistway and the governor rope tend to interfere with each other.

In response, an emergency stop device that does not use a governor rope has been proposed.

The technology described in Patent Document 1 is known as a conventional technology related to a safety device that does not use a governor rope.

In this prior art, a drive shaft that drives the safety device and an operating mechanism that operates the drive shaft are provided on the car. The operating mechanism includes a movable iron core mechanically connected to the drive shaft via a connecting piece, and an electromagnet that attracts the movable iron core. The drive shaft is biased by a drive spring, but normally the movement of the drive shaft is restrained by the operating mechanism because the electromagnet is energized and the movable iron core is attracted.

In the event of an emergency, the electromagnet is demagnetized and the restraint on the drive shaft is released, and the drive shaft is driven by the biasing force of the drive spring. As a result, the lifting rod of the safety device is pulled up, so that the safety device operates to bring the car to an emergency stop.

Also, when returning the safety device to its normal state, move the electromagnet closer to the movable iron core that was moved in the event of an emergency. When the electromagnet contacts the movable core, the electromagnet is energized and the movable core is attracted to the electromagnet. Further, the electromagnet is driven while the movable iron core is attracted to the electromagnet, and the movable iron core and the electromagnet are returned to the normal standby position. The movement mechanism of the electromagnet has a feed screw shaft with which the electromagnet is screwed, and a motor for rotating the feed screw shaft.

WO2020/110437

In the conventional technology described above, since the operating mechanism is configured to pull up the lifting rod of the safety device, the degree of freedom in installing the operating mechanism is limited and the installation space for the operating mechanism increases.

In the above conventional technology, the drive mechanism including the drive shaft and the operating mechanism occupy a large space. This limits the freedom of installation of the drive and actuation mechanisms in the car.

Therefore, the present invention provides an elevator apparatus equipped with an electric emergency stop device that can reduce the occupied space and is suitable for space saving.

In order to solve the above problems, an elevator apparatus according to the present invention includes a car, a safety device provided in the car, a drive mechanism provided in the car for operating the safety device, and a drive mechanism for operating the safety device. an electric actuator, wherein the drive mechanism has a drive rod connected to the safety device and operating the safety device, the drive rod having a torsion spring portion, and the electric actuator When operated, the driving rod rotates due to the biasing force of the torsion spring portion, and the rotation of the driving rod causes the safety device to operate.

According to the present invention, the space occupied by the drive mechanism of the safety device can be reduced.

Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

1 is a schematic configuration diagram of an elevator apparatus that is an embodiment; FIG. FIG. 2 is a view in the direction of arrow A in FIG. 1, showing the configuration of the safety device in the example. FIG. 2 is a configuration diagram showing the mechanical structure of the electric actuator 10 (FIG. 1) when the safety device 2 is in a non-operating state; FIG. 4 is a plan view showing the mechanical structure of the electric actuator shown in FIG. 3; Fig. 2 is a configuration diagram showing the mechanical structure of the electric actuator 10 (Fig. 1) when the safety device 2 is in an operating state; FIG. 6 is a plan view showing the mechanical structure of the electric actuator shown in FIG. 5;

Hereinafter, an elevator apparatus that is one embodiment of the present invention will be described by way of an example using the drawings. In each figure, the same reference numbers denote the same components or components with similar functions.

FIG. 1 is a schematic configuration diagram of an elevator system that is one embodiment of the present invention.

As shown in FIG. 1, the elevator system includes a car 1, a safety device 2, a drive mechanism (12 to 17) for operating the safety device 2, and an electric actuator 10 for operating the drive mechanism. I have.

The car 1 is suspended in a hoistway provided in the building by a main rope 3 that is wound around a car under pulley 5 that is provided at the bottom of the car 1 . Further, the car 1 is slidably engaged with the guide rails 4 via a guide device (not shown). When the main rope 3 is friction-driven by a driving device (hoisting machine, not shown), the car 1 ascends and descends in the hoistway. The elevator apparatus of this embodiment is a so-called machine room-less elevator in which a drive device (hoisting machine: not shown) and an elevator control device (not shown) are installed in the hoistway.

A speed detection device (not shown) is provided in the car 1 and constantly detects the ascending/descending speed of the car 1 in the hoistway. Therefore, the speed detector can detect that the elevator car 1 has exceeded a predetermined overspeed.

In this embodiment, the speed detection device is provided with an image sensor, and detects the speed of the car 1 based on the image information of the surface condition of the guide rail 4 acquired by the image sensor. For example, the speed detection device calculates the speed from the moving distance of the image feature amount in a predetermined time.

Note that the speed detection device may calculate the speed of the car based on the output signal of a rotary encoder that rotates as the car moves.

The electric actuator 10 is an electromagnetic actuator in this embodiment and is arranged at the bottom of the car 1 . The drive mechanism (12-17) is also arranged below the car 1. As shown in FIG.

When the electric actuator 10 is actuated, the drive rod 12 that drives the safety device 2 rotates around the central axis in the longitudinal direction due to the biasing force of the spring portion 13 . When the drive rod 12 rotates, a brake (described later) of the safety device 2 is pushed up. As a result, the safety device 2 operates.

As shown in FIG. 1, the drive rod 12 is arranged below the car 1. The drive rod 12 is rotatably supported below the car 1 by a first support portion 16 and a second support portion 17 .

In this embodiment, the spring portion 13 is made of a torsion coil spring. The drive rod 12 is inserted through the spring portion 13 . One end of the spring portion 13 , ie, the torsion coil spring, is fixed to a locking portion 14 on the surface of the drive rod 12 . Also, the spring portion 13 , that is, the other end of the torsion coil spring is fixed to a fixing portion 15 positioned below the car 1 .

Therefore, as will be described later, when the electric actuator 10 operates and the drive rod 12 rotates, the spring portion 13 receives a torsional moment and stores bending elastic energy around the central axis of the spring portion 13 . In this embodiment, the drive rod 12 is inserted through the spring portion 13 , so the central axis of the spring portion 13 substantially coincides with the rotational central axis of the drive rod 12 . Therefore, when the bending elastic energy of the spring portion 13 is released, the drive rod 12 rotates due to the biasing force of the spring portion 13 as described above.

The details of the configuration and operation of the electric actuator 10 will be described later.

The safety devices 2 are arranged one by one on the left and right sides of the car 1. A pair of brake elements included in each safety device 2 is movable between a braking position and a non-braking position, and sandwiches the guide rail 4 at the braking position. Furthermore, when the safety device 2 rises relative to the car 1 due to the descent of the car 1, the frictional force acting between the brake shoe and the guide rail 4 produces a braking force. As a result, the safety device 2 is actuated when the car 1 is in an overspeed condition to bring the car 1 to an emergency stop.

The elevator system of this embodiment has a so-called ropeless governor system that does not use a governor rope. ), the power supply to the drive (hoist) and to the control device controlling this drive is cut off. Further, when the descending speed of the car 1 reaches a second overspeed (for example, a speed not exceeding 1.4 times the rated speed), the electric actuator 10 provided in the car 1 operates the safety device 2. Then, the car 1 is brought to an emergency stop.

In this embodiment, the ropeless governor system is composed of the aforementioned speed detection device and a safety control device that determines the overspeed state of the car 1 based on the output signal of the speed detection device. This safety control device measures the speed of the car 1 based on the output signal of the speed detection device, and when it is determined that the measured speed has reached the first overspeed, the power supply of the drive device (hoisting machine) and It outputs a command signal for shutting off the power supply of the control device that controls this drive device. Further, when the safety control device determines that the measured speed has reached the second overspeed, it outputs a command signal for operating the electric actuator 10 .

FIG. 2 is a view from the arrow A in FIG. 1, showing the configuration of the safety device 2 in this embodiment.

As shown in FIG. 2, a pair of brakes 201 are placed on a pedestal 202 . When the push-up rod 203 fixed to the pedestal 202 is driven upward in the figure, the pedestal 202 pushes up the brake shoe 201 to the braking position. The rotational force of the drive rod 12 is converted into driving force for moving the push-up rod 203 upward by the first link portion 101, the second link portion 102, and the third link portion that are rotatably connected to each other. be done.

The end of the drive rod 12 is connected to the central portion of the first link portion 101 in the longitudinal direction. One end portion in the longitudinal direction of the first link portion 101 and one end portion in the longitudinal direction of the second link portion 102 are rotatably connected to each other at the connection portion 110 . The other longitudinal end of the second link portion 102 and one longitudinal end of the third link portion 103 are rotatably connected to each other at a connecting portion 111 . A central portion in the longitudinal direction of the third link portion 103 is rotatably supported by a fixed shaft 115 . The ends of drive rods 12 are connected. The other end in the longitudinal direction of the third link portion 103 and the one end in the longitudinal direction of the push-up rod 203 are rotatably connected to each other at the connecting portion 112 .

When the drive rod 12 rotates in the direction of the arrow in the drawing, the push-up rod 203 is driven upward by the first to third link portions (101, 102, 103). As a result, the brake shoe 201 placed on the pedestal fixed to the push-up rod 203 is pushed up to the braking position.

The configuration and operation of the electric actuator 10 will be described below.

FIG. 3 is a configuration diagram showing the mechanical structure of the electric actuator 10 (FIG. 1) when the safety device 2 is in a non-operating state. 4 is a plan view showing the mechanical structure of the electric actuator shown in FIG. 3. FIG. Since the safety device 2 is in a non-operating state, the electric actuator is in a non-operating state (standby state). That is, the elevator installation is in normal operation.

As shown in FIGS. 3 and 4, the electric operating section includes an operation lever 11 connected to the drive rod 12, a movable member 34 rotatably engaged with the operation lever 11, and an electromagnetic force that attracts the movable member 34. It has an electromagnet part 35 that The electromagnet portion 35 has two electromagnet core portions 35A whose magnetic pole surfaces face the movable member 34, and an electromagnet support plate 35B to which the two electromagnet core portions 35A are fixed. At least the portion of the movable member 34 that is attracted to the electromagnet portion 35 is made of a magnetic material.

The electric actuator includes a feed screw 36 (for example, a trapezoidal screw) rotatably supported by a first support member 41 and a second support member 42 fixed to a base portion 50 provided at the bottom of the car 1. , and a motor 37 that drives a feed screw 36 to rotate. The feed screw 36 is screwed with a feed nut 35C provided in the electromagnet portion 35 . When the motor 37 rotates the feed screw 36, the rotating feed screw 36 and the feed nut 35C provided in the electromagnet 35 cause the rotation of the motor 37 to linearly move the electromagnet 35 along the axial direction of the feed screw 36. is converted to

The base part 50 is formed by bending a plate-like member, and has a fixed part fixed to the car 1 and a convex part projecting downward from the car 1 . The feed screw 36 , the movable member 34 , the electromagnet portion 35 and the motor 37 are positioned below the convex portion of the base portion 50 . The drive rod 12 is positioned in the space between the lower portion of the car 1 and the convex portion of the base portion 50 . One longitudinal end of the operating lever 11 is connected to the drive rod 12 . The operating lever 11 passes through an opening 50C in the convex portion of the base portion 50. As shown in FIG. The other end of the operating lever 11 in the longitudinal direction is connected to the movable member 34 .

As shown in FIGS. 3 and 4, in the standby state, the movable member 34 is attracted to the electromagnet section 35 which is excited. The electromagnet part 35 is located at a predetermined position in the standby state. At this time, the biasing force of the spring portion 13 (FIG. 1) acts on the drive rod 12 so as to rotate it in the direction of the arrow shown in FIG. At this time, since the movable member 34 is attracted to the electromagnet portion 35 , the movement of the movable member 34 and the operating lever 11 and the rotation of the drive rod 12 are restrained against the biasing force of the spring portion 13 . .

FIG. 5 is a configuration diagram showing the mechanical structure of the electric actuator 10 (FIG. 1) when the safety device 2 is in an operating state. 6 is a plan view showing the mechanical structure of the electric actuator shown in FIG. 5. FIG. Since the safety device 2 is in the operating state, the electric actuator is in the operating state. That is, the elevator installation is at rest.

In the standby state described above, when the excitation of the electromagnet portion 35 is stopped by a command from the safety control device (not shown), the attractive force acting on the movable member 34 disappears, so that the biasing force of the spring portion 13 (FIG. 1) As a result, the drive rod 12 rotates in the direction of the arrow shown in FIG. At this time, since the operating lever 11 rotates together with the driving rod 12 , the movable member 34 connected to the operating lever 11 moves away from the electromagnet portion 35 along the longitudinal direction of the feed screw 36 . In addition, the electromagnet part 35 stays at a predetermined position in the standby state.

When the drive rod 12 rotates, the push-up rod 203 (Fig. 2) of the safety device 2 is driven upward. As a result, the safety device 2 operates.

Here, the operation of the electric actuator when returning from the operating state shown in FIGS. 5 and 6 to the standby state shown in FIGS. 3 and 4 will be described.

　In order to return the electric actuator to the standby state, first, the motor 37 is driven to rotate the feed screw 36 . Rotation of the motor 37 is converted into linear movement of the electromagnet portion 35 along the axial direction of the feed screw 36 by the rotating feed screw 36 and the feed nut 35C provided in the electromagnet portion 35 . As a result, the electromagnet part 35 approaches the movable member 34 positioned at the operating position as shown in FIGS.

When contact between the electromagnet part 35 and the movable member 34 is detected by a switch or sensor (not shown) or the load current of the motor 37, the electromagnet part 35 is excited and the motor 37 is stopped. The movable member 34 is attracted to the electromagnet portion 35 by the action of electromagnetic force. When the movable member 34 is attracted to the electromagnet portion 35, the direction of rotation of the motor 37 is reversed while the excitation of the electromagnet portion 35 is continued, and the feed screw 36 is reversed. As a result, the movable member 34 moves together with the electromagnet portion 35 to a predetermined position in the standby state as shown in FIG.

When a switch or sensor (not shown) detects that the electromagnet part 35 or the movable member 34 has reached a predetermined position in the standby state, the motor 37 is stopped. The excitation of the electromagnet part 35 is continued.

While the movable member 34 is moving from the operating position (FIGS. 5 and 6) to the predetermined position (FIGS. 5 and 6) in the standby state, the operating lever 11 causes the driving rod 12 to move in the direction opposite to the direction of the arrow shown in FIG. direction. Therefore, the spring portion 13 (FIG. 1), which is a torsion coil spring, receives a torsional moment and stores bending elastic energy around the central axis of the spring portion 13 . Therefore, the spring portion 13 releases elastic energy when the electric actuator 10 is actuated, and then stores elastic energy when the electric actuator returns to the standby state.

According to the embodiment described above, the space occupied by the drive mechanism of the safety device 2 and the electric actuator 10 can be reduced. Therefore, the drive mechanism and the electric actuator 10 can be installed in a narrow space like the lower part of the car 1.

In this embodiment, both the longitudinal direction of the drive rod 12 in the drive mechanism and the longitudinal direction of the feed screw 36, that is, the longitudinal direction of the electric actuator are parallel to the lower surface of the car 1 (for example, the car floor surface). are arranged so that As a result, the space occupied by the drive mechanism of the safety device 2 and the electric actuator 10 can be reliably reduced.

A torsion bar spring (torsion bar) may be used instead of the torsion coil spring. In this case, for example, at least part of the drive rod 12 is constituted by a torsion bar spring.

It should be noted that the present invention is not limited to the above-described embodiments, and includes various modifications. For example, the above-described embodiments have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the described configurations. Moreover, it is possible to add, delete, or replace a part of the configuration of the embodiment with another configuration.

For example, if the safety device is installed above the car 1, the electric actuator 10 may be provided above the car.

Also, the elevator device may have a machine room.

DESCRIPTION OF SYMBOLS 1... Car, 2... Emergency stop device, 3... Main rope, 4... Guide rail, 5... Under-car pulley, 10... Electric actuator, 11... Operation lever, 12... Drive rod, 13... Spring part, 14... Locking portion 15 Fixed portion 16 First support portion 17 Second support portion 34 Movable member 35 Electromagnet portion 35A Electromagnet core portion 35B Electromagnet support plate 35C Feed Nut 36 Feed screw 37 Motor 41 First support member 42 Second support member 50 Base portion 50C Opening 101 First link portion 102 Second Link part 103... Third link part 110... 111... Connection part 112... Connection part 115... Fixed shaft 201... Brake shoe 202... Pedestal part 203... Push-up rod

Claims

car and
a safety device provided in the car;
a drive mechanism provided in the car for operating the safety device;
an electric actuator that operates the drive mechanism;
In an elevator installation comprising
The drive mechanism has a drive rod connected to the safety device to operate the safety device,
The drive rod has a torsion spring portion,
When the electric actuator operates, the driving rod rotates due to the biasing force of the torsion spring portion,
An elevator apparatus, wherein the safety device is operated by the rotation of the drive rod.
The elevator installation of claim 1, wherein
The electric actuator is
a lever portion connected to the drive rod;
a movable member rotatably connected to the lever;
an electromagnet that attracts the movable member in a standby state;
with
The elevator apparatus according to claim 1, wherein, in the standby state, when the electric actuator is operated to stop the excitation of the electromagnet portion, the driving rod is rotated by the urging force of the torsion spring portion.
An elevator installation according to claim 2, wherein
The electric actuator is
a feed screw that screws together with the electromagnet;
and a motor for rotating the feed screw.
An elevator installation according to claim 3, wherein
An elevator apparatus, wherein the electromagnet moves along the axial direction of the feed screw when the feed screw is rotated by the motor.
In the elevator installation according to claim 4,
The elevator apparatus according to claim 1, wherein the movable member moves together with the electromagnet section by being attracted to the electromagnet section.
In the elevator installation according to claim 5,
An elevator apparatus according to claim 1, wherein a torsion moment is applied to said torsion spring portion by said lever portion when said movable member attracted to said electromagnet portion moves together with said electromagnet portion.
The elevator installation of claim 1, wherein
The elevator apparatus, wherein the torsion spring section has a torsion coil spring.
The elevator installation of claim 1, wherein
The elevator apparatus, wherein the torsion spring portion is a torsion bar spring that constitutes the drive rod.
The elevator installation of claim 1, wherein
An elevator apparatus, wherein the drive mechanism and the electric actuator are provided below the car.