JP7562006B2 - Elevator Equipment - Google Patents

Description

The present invention relates to an elevator system equipped with an electrically operated emergency stop device.

Elevator systems are equipped with a governor and an emergency stop device to constantly monitor the ascending and descending speed of the car and bring the car to an emergency stop if it becomes overspeeding to a certain extent. Generally, the car and the governor are connected by a governor rope, and when an overspeeding state is detected, the governor restrains the governor rope to activate the emergency stop device on the car side and bring the car to an emergency stop.

In such elevator systems, it is difficult to reduce space and costs because a long governor rope is laid inside the hoistway. Also, if the governor rope sways, it is likely to interfere with structures in the hoistway.

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

The technology described in Patent Document 1 is known as conventional technology relating to an emergency stop device that does not use a governor rope.

In this conventional technology, a drive shaft that drives the emergency stop device and an operating mechanism that operates the drive shaft are provided on the car. The operating mechanism includes a movable iron core that is 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 under normal circumstances, the electromagnet is energized and the movable iron core is attracted, so that the movement of the drive shaft is restricted by the operating mechanism.

In the event of an emergency, the electromagnet is demagnetized, releasing the drive shaft, and the drive shaft is driven by the force of the drive spring. This causes the lifting rod of the emergency stop device to be pulled up, activating the emergency stop device and bringing the car to an emergency stop.

When returning the emergency stop device to its normal state, the electromagnet is moved closer to the movable iron core that moved in the emergency. When the electromagnet comes into contact with the movable iron core, electricity is passed through the electromagnet, and the movable iron core is attracted to the electromagnet. With the movable iron core attracted to the electromagnet, the electromagnet is driven to return the movable iron core and electromagnet to their normal standby positions. The electromagnet movement mechanism includes a feed screw shaft into which the electromagnet screws, and a motor that rotates the feed screw shaft.

International Publication No. 2020/110437

In the above-mentioned conventional technology, the operating mechanism is configured to pull up the lifting rod of the emergency stop device, which limits the freedom of installation of the operating mechanism and increases the installation space required for the operating mechanism.

Therefore, the present invention provides an elevator system equipped with an electric emergency stop device that allows for greater freedom in installation and is suitable for space saving.

In order to solve the above problems, the elevator system according to the present invention comprises a car, an emergency stop device provided in the car, and an electric actuator provided in the car for operating the emergency stop device, the electric actuator comprising a movable member, an electromagnet which attracts the movable member when the electric actuator is in a standby state, a rod connected to the movable member, and a brake shoe actuation member connected to the end of the rod, and when excitation of the electromagnet is stopped and the rod is driven, the brake shoe of the emergency stop device is pushed up by the brake shoe actuation member.

According to the present invention, the space occupied by the operating mechanism of the emergency stop device can be reduced and the freedom of installation location of the operating mechanism is increased.

Issues, configurations and effects other than those described above will become clear from the description of the embodiments below.

1 is a schematic configuration diagram of an elevator apparatus according to an embodiment of the present invention; FIG. 2 is a front view showing a mechanism of the electric actuator according to the embodiment. FIG. 2 is a front view showing a mechanism of the electric actuator according to the embodiment. FIG. 2 is a side view showing a mechanism of the electric actuator according to the embodiment. FIG. 11 is a side view showing a mechanism of an electric actuator according to a modified example.

An elevator device according to one embodiment of the present invention will be described below by way of example with reference to the drawings. In each drawing, the same reference numbers indicate the same components or components with similar functions.

Figure 1 is a schematic diagram of an elevator system according to one embodiment of the present invention.

As shown in Figure 1, the elevator system includes a car 1, an electric actuator 10, a drive mechanism (12, 100, etc.), and an emergency stop device 2.

The car 1 is suspended by a main rope (not shown) in a hoistway provided in a building, and is slidably engaged with a guide rail 4 via a guide device (not shown). When the main rope is frictionally driven by a drive device (hoist: not shown), the car 1 rises and falls in the hoistway.

A speed detection device (not shown) is provided in the car 1 and constantly detects the ascent/descent speed of the car 1 in the elevator. Therefore, the speed detection device can detect when the ascent/descent speed of the car 1 exceeds a predetermined overspeed.

In this embodiment, the speed detection device includes an image sensor and detects the speed of the car 1 based on 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 travel distance of the image feature in a given time.

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

In this embodiment, the electric actuator 10 is an electromagnetic actuator and is disposed at the bottom of the car 1. The drive mechanism (12, 100, etc.) is also disposed at the bottom of the car 1.

When the electric actuator 10 is actuated, the brake 200 of the emergency stop device 2 is pushed up by the brake actuation member 100. In other words, the brake 200 is actuated by the brake actuation member 100. This causes the emergency stop device 2 to operate.

Details of the electric actuator 10 and drive mechanism (12, 100, etc.) will be described later.

The emergency stop devices 2 are arranged on the left and right sides of the car 1. The pair of brakes 200 provided on each emergency stop device 2 are movable between a braking position and a non-braking position, and clamp the guide rail 4 in the braking position. Furthermore, when the emergency stop device 2 rises relative to the car 1 due to the descent of the car 1, a braking force is generated by the frictional force acting between the brakes 200 and the guide rail 4. As a result, the emergency stop device 2 operates when the car 1 falls into an overspeed state, and brings the car 1 to an emergency stop.

The elevator system of this embodiment is equipped with a so-called ropeless governor system that does not use a governor rope, and when the ascent/descent speed of the car 1 exceeds the rated speed and reaches a first overspeed (e.g., a speed not exceeding 1.3 times the rated speed), the power supply to the drive device (hoist) and the power supply to the control device that controls this drive device are cut off. Also, when the descent speed of the car 1 reaches a second overspeed (e.g., a speed not exceeding 1.4 times the rated speed), the electric actuator 10 provided in the car 1 activates the emergency stop device 2, and the car 1 is brought to an emergency stop.

In this embodiment, the ropeless governor system is composed of the above-mentioned 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 determines that the measured speed has reached a first overspeed, it outputs a command signal to cut off the power supply to the drive device (hoist) and the power supply to the control device that controls this drive device. In addition, when the safety control device determines that the measured speed has reached a second overspeed, it outputs a command signal to operate the electric actuator 10.

As described above, when the pair of brake shoes provided in the emergency stop device 2 are activated by the brake shoe activation member 100, the pair of brake shoes clamp the guide rail 4.

Figure 2 is a front view showing the electric actuator 10 and the drive mechanism in this embodiment in the installed state shown in Figure 1. In Figure 2, the emergency stop device is in a non-braking state, and the electric actuator 10 is in a non-operating state (standby state). In other words, the elevator system is in a normal state.

When the elevator device is in normal operation, the electric actuator 10 is in a standby state. In the standby state, the movable member 34 is attracted to the excited electromagnet 35. This restricts the movement of the connection bracket 38 that connects the movable member 34 and the pressing member 15 (spring seat) against the biasing force of the drive spring 13 (compression spring). At least the part of the movable member 34 that is attracted to the electromagnet 35 is made of a magnetic material.

The rod 21 passes through the pressing member 15. The pressing member 15 is fixed to the rod 21. The fixed member 14 is fixed to a structural member (not shown) of the car 1 located under the car, such as a car bottom frame. The rod 21 passes through the fixed member 14 in a slidable manner. The rod 21 is inserted into the drive spring 13. The drive spring 13 is located between the fixed member 14 and the pressing member 15. One end and the other end of the drive spring 13 abut against the fixed member 14 and the pressing member 15, respectively. When the electric actuator 10 is in a standby state, the drive spring 13 is pressed by the fixed member 14 and the pressing member 15. Therefore, the drive spring 13 is compressed and stores elastic energy. In other words, the drive spring 13 stores a biasing force.

A rod 21 is connected to each of the pair of left and right brake actuator members 100. Each rod 21 can operate in conjunction with the others via a link mechanism consisting of a link 12 and a link retaining pin 30.

In this embodiment, the brake shoe actuation member 100 has a tapered portion, and the tapered surface contacts the bottom of the brake shoe 200.

In this embodiment, the brake shoe activation member 100 is made of a bar-shaped metal member. The metal member may be a bulk member or a plate-shaped member that has been bent and formed. Note that as long as it has sufficient strength to support and push up the brake shoe 200, it is not limited to a bar-shaped metal member, and members of various shapes and materials may be used.

Figure 3 is a front view showing the electric actuator 10 and the drive mechanism in this embodiment in the installed state shown in Figure 1. In Figure 3, the safety device is in a braking state and the electric actuator 10 is in an operating state. In other words, the elevator system is in a stopped state.

When excitation of the electromagnet 35 is stopped by a command from a safety control device (not shown), the attractive force acting on the movable member 34 disappears, and the biasing force of the drive spring 13 is released to drive the rod 21. At this time, the rod 21 that is not connected to the connection bracket 38 is also driven in conjunction with the link mechanism. As a result, the tapered surface of the brake shoe actuation member 100 pushes up the brake shoe 200.

To return the electric actuator 10 to the standby state, the electric actuator 10 is operated as described below.

The electric actuator 10 has a feed screw 36 (e.g., a trapezoidal screw) located on a flat surface of the substrate to drive the movable member 34. The feed screw 36 is rotatably supported by a first support member 41 and a second support member 42 fixed on the flat surface of the substrate. The electromagnet 35 has a nut portion, which is screwed into the feed screw 36. The feed screw 36 is rotated by a motor 37.

The base plate may be a plate-like member such as a metal plate, or a flat surface of the steel material that constitutes the cage bottom frame.

To return the electric actuator 10 to the standby state, first, the motor 37 is driven to rotate the feed screw 36. The rotating feed screw 36 and the nut portion of the electromagnet 35 convert the rotation of the motor 37 into linear movement of the electromagnet 35 along the axial direction of the feed screw 36. As a result, the electromagnet 35 approaches the movable member 34 and comes into contact with the movable member 34. When the contact between the electromagnet 35 and the movable member 34 is detected by a switch (not shown) or the load current of the motor 37, the electromagnet 35 is excited and the motor 37 is stopped. The movable member 34 is attracted to the electromagnet 35 by the action of an electromagnetic force. When the movable member 34 is attracted to the electromagnet 35, the direction of rotation of the motor 37 is reversed while continuing to excite the electromagnet 35, and the feed screw 36 is reversed. As a result, the movable member 34 moves to the standby position together with the electromagnet 35.

Figure 4 is a side view showing the mechanism of the electric actuator 10 in this embodiment in the installed state shown in Figure 1. That is, Figure 4 is a view from point A in Figure 2.

As shown in FIG. 4, the rod 21 extends toward the area directly below the pair of brake shoes 200. Therefore, the brake shoe actuation member 100 connected to the end of the rod 21 is in direct contact with the brake shoes 200.

Note that the emergency stop device in this embodiment does not have a lifting rod whose longitudinal direction extends in the height direction of the car, unlike emergency stop devices according to known technology. The other configurations are the same as those of emergency stop devices according to known technology. For example, as shown in FIG. 4, the brake shoe 200 and an elastic body such as a leaf spring that presses against the brake shoe 200 are stored in a housing 201 (or a frame body).

Figure 5 is a side view similar to Figure 4, showing the mechanical parts of the electric actuator 10 in a modified elevator system.

In this modified example, a lever 203 is connected to the lower part of the pair of brake shoes 200. The lever 203 extends from the side of the pair of brake shoes 200, i.e., from the lower part of the brake shoes 200, in a direction perpendicular to the longitudinal direction of the rod 21. The end of the extension of the lever 203, i.e., the free end, contacts the tapered surface of the brake shoe actuation member 100.

In this modified example, the lever 203 is pushed up by the brake shoe actuation member 100, thereby pushing up the brake shoe 200.

According to the above-described embodiment, the brake shoe 200 is pushed up by the brake shoe actuation member 100, thereby reducing the space occupied by the emergency stop device's operating mechanism (electric actuator 10 and drive mechanism (12, 200, etc.)) and improving the freedom of installation position of the operating mechanism.

Note that the present invention is not limited to the above-described embodiments, and includes various modified examples. For example, the above-described embodiments have been described in detail to clearly explain the present invention, and are not necessarily limited to those having all of the configurations described. In addition, it is possible to add, delete, or replace part of the configuration of the embodiments with other configurations.

For example, if the emergency stop device is installed above the car, the electric actuator may be provided on the car.

The elevator system may have a machine room or may be a so-called machine room-less elevator.

1...car, 2...emergency stop device, 4...guide rail, 10...electric actuator, 12...link, 13...drive spring, 14...fixed member, 15...pressure member, 21...rod, 30...link retaining pin, 34...movable member, 35...electromagnet, 36...feed screw, 37...motor, 38...connecting bracket, 41...support member, 42...support member, 100...brake actuator member, 200...brake, 203...lever

Claims (5)

A car,
First and second safety devices are provided on both the left and right sides below the car;
An electric actuator provided in the car for operating the safety device;
In an elevator installation comprising:
The electric actuator comprises:
A movable member;
an electromagnet that attracts the movable member when the electric actuator is in a standby state;
A first rod connected to the movable member;
a first brake actuator member connected to an end of the first rod;
a second rod that can be linked with the first rod by a link mechanism;
a second brake actuator member connected to an end of the second rod;
Equipped with
When the excitation of the electromagnet is stopped and the first rod is driven, the brake shoe of the first emergency stop device is pushed up by the first brake shoe actuation member, and the second rod linked to the first rod is driven, so that the brake shoe of the second emergency stop device is pushed up by the second brake shoe actuation member,
The electric actuator comprises:
a feed screw that is engaged with the electromagnet;
a motor that rotates the forward feed screw;
The electric actuator is provided below the elevator car,
An elevator apparatus, wherein the first and second rods and the feed screw are arranged parallel to each other in a longitudinal direction. 2. The elevator system according to claim 1,
the first and second brake actuator members have tapered surfaces;
An elevator apparatus, characterized in that the brake shoe is pushed up by the tapered surface. In the elevator system according to claim 2,
An elevator apparatus, characterized in that the tapered surface is in direct contact with a lower portion of the brake shoe. In the elevator system according to claim 2,
An elevator apparatus, characterized in that the tapered surface is connected to the brake shoe and contacts a lever extending laterally from the brake shoe. 2. The elevator system according to claim 1,
An elevator apparatus, wherein the first and second rods are driven by a spring force.

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