JPH0826620A - Rescue device of elevator - Google Patents

Abstract

PURPOSE:To rescue safely passengers confined in an elevator car in a power failure condition, in an elevator having a cage moving vertically along a rotating ball screw rod. CONSTITUTION:In an elevator in which a ball nut 4 provided to a cage 2 is screwed to a ball screw rod 3 extended along the floors, and the ball screw rod 3 is rotated regularly and reversely by an electric motor 5 with brake, a centrifugal brake 7 is provided at the terminal end at the opposite side to the electric motor connecting side of the ball screw rod 3, and a battery to release the brake of the electric motor 5 in a power failure condition is also provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is directed to an elevator for moving a cage up and down by a ball screw rod which is rotated by an electric motor. This type of elevator is relatively small and is generally used for home use. The present invention relates to a rescue device that moves a cage to the entrance and exit of a floor in the event of an emergency that stops in the middle of the floor due to a power outage or a failure of an electric motor.

[0002]

2. Description of the Related Art Elevators have means for moving the cage to the floor entrance and exit to rescue the occupants when an accident occurs in which the occupants are trapped in the middle of the floor due to a power failure or the like. It is provided.

Conventionally, the following several types of methods are generally known. (A) DC motor system, an AC motor (induction motor) is used for normal operation, but a DC motor driven by the DC power source of the battery is provided separately for emergency use, and in an emergency, the clutch is connected by the battery power source. A method of switching from an AC motor to a DC motor and moving to a nearby floor. (B) Inverter type, uninterruptible power supply device, that is, a device that normally supplies commercial AC power and converts the DC of the built-in battery into AC by an inverter to supply power to the load in an emergency. A method of automatically switching to a desired floor without stopping the cage. (C) Desk brake system, the cage is placed on the output shaft of an electric motor with a brake that normally moves up and down, and in an emergency, the brake of the electric motor is released and the desk brake is clamped by electromagnetic force or hydraulic pressure for braking. A method of lowering the cage to the bottom while hanging it by its own weight and the occupant's own weight. (D) Applying the principle of generating a large braking force when a DC voltage is applied to an induction motor that rotates by inertial force on the load side, an electric brake system, detects the absence of AC voltage application due to a power failure, etc. A system that switches to a battery that is used and applies a DC voltage to brake.

[0004]

Each of the above-mentioned systems has a complicated facility, requires another starting force such as a battery, and has a large starting force, and is a relatively small elevator for home use. Had the problem of being very expensive. Moreover, with the method (C), it is difficult to adjust the braking torque according to the load.

An object of the present invention is to solve the above problems and to provide a rescue device having a simple structure and capable of safely lowering the cage to the lowest stage.

[0006]

Means for Solving the Problems The solution according to the present invention is an elevator in which a ball nut provided on a cage is screwed onto a ball screw rod standing upright on each floor, and the ball screw rod is rotated forward and backward by a motor with a brake. A centrifugal brake is provided at the end of the ball screw rod on the opposite side of the electric motor connecting side, and a battery for releasing the brake of the electric motor at the time of power failure is provided.

[0007]

[Function] During an emergency, when the elevator stops, the electric motor stops due to a power failure and the brakes are applied, and the cage stops in the middle of the floor. Although the cage falls while rotating the ball screw rod, the centrifugal force of the centrifugal brake operates more as the rotational speed of the ball screw rod increases, so the rotational speed of the ball screw rod is controlled. If you adjust the centrifugal force so that it will not operate during normal operation, the cage will fall at a speed that is almost the same as during normal operation.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Explaining from the outline of an elevator equipped with a rescue device of the present invention, as shown in FIG. 1, a cage 2 is provided in a tower 1 over three floors so that it can be moved up and down, and its raising and lowering is performed. A ball screw rod 3 extending up to the third floor is provided so as to be upright and rotatable, and a ball nut 4 protruding from the cage 2
Is engaged with the ball screw rod 3, and the electric motor 5 with a brake connected to the upper end of the ball screw rod 3 is driven to raise and lower the cage 2 and stop at the target floor.

If a power failure happens or the electric motor 5 breaks down during the operation of the elevator, the electric motor 5 is braked and the cage 2 is stopped in the middle of the floor. In that state, an occupant can escape from the cage 2. Disappear.
Therefore, in order to rescue the occupant, the brake of the electric motor 5 is released and the cage 2 is lowered by its own weight to the lowest stage at a safe speed.

Since a power source is required to release the brake of the electric motor 5, a backup battery 6 is provided at an appropriate position near the control panel 15, and a "power failure" as shown in the flow chart of FIG. If "the power is not restored" for a predetermined time, for example, 20 seconds, and if the "emergency button" provided in the cage 2 is manually pressed during that time, the backup battery will be used after "the set time has elapsed". The "brake release of the electric motor" is performed by the power source 6 and the cage 2 is "fallen" by its own weight.

As described above, when the cage 2 is lowered, it is accelerated and falls rapidly. Therefore, a centrifugal brake 7 is provided at the lower end of the ball screw rod 3 so that the falling speed can be reduced. The centrifugal brake 7 may use an existing product, but the ball screw rod 3 is the electric motor 5 and the braking is not applied at a normal rotation speed, but the centrifugal force is adjusted so that the braking is applied at a speed higher than that. Use a mechanism that allows As an example thereof, as shown in FIGS. 3 and 4, a brake drum 8 penetrating the ball screw rod 3 is fixed to the steel tower 1, and a plate 9 is attached to the ball screw rod 3 to form the brake drum 8.
A plurality of links 1 are fixed to the plate 9 so as to be opposed to the inner circumference of the plate and fixed.
0 is rotatably supported substantially at the center in the longitudinal direction, and a brake shoe 11 curved in an arc shape is rotatably supported at one end of each link 10, and a shaft for supporting the brake shoe 11 is provided. Next link 10 to plate 9
The springs 12 for return movement are installed between the shafts supported by the springs, and each spring 12 is hooked like a hook. Further, a counterweight 13 is attached to the tip end of the link 10 on the opposite side to the above to set the operation of centrifugal force to a predetermined value.

Therefore, as shown in FIG. 2, the brake is released, the car 2 and the occupant's own weight start "descent", and the vehicle is gradually accelerated.
Is operated at a speed higher than the normal ascending / descending speed of the cage 2, so that the operation decelerates the descending speed of the cage 2 and the descending speed is almost the same as the normal time. When descending as described above and "arriving at the lowermost stage", the buffer spring 14 is provided at the bottom of the steel tower 1 as shown in Fig. 1. Therefore, the cage 2 hits the buffer spring 14 to reduce the impact at the time of stop. Stop. After that, the passenger can manually "open" the door to "escape" to the lowest floor.

The control shown in FIG. 2 is of a manual type in which an emergency button provided in the cage 2 is pushed by an occupant, but it is not necessarily required to be done manually, and after a lapse of a predetermined time during no voltage application. Alternatively, the brake of the electric motor 5 may be automatically released by the power source of the backup battery 6.

[0014]

The elevator rescue device according to the present invention comprises a backup battery for releasing the brake of the electric motor for raising and lowering the cage, and a centrifugal brake provided on the ball screw rod for raising and lowering the cage. The structure is simple and the equipment cost is low.

Further, since the backup battery only releases the brake of the electric motor and does not drive the ball screw rod, very small electric power is sufficient, it is miniaturized, and a large space dedicated for the battery is required. do not do.

Furthermore, since the cage descends by its own weight and the acceleration is mechanically decelerated by the centrifugal brake, no external input is required for rescue, and a reliable rescue operation is obtained. It is what is done.

Further, since the centrifugal brake is capable of adjusting its operating force, if the centrifugal brake is adjusted so as not to operate at a normal ascending / descending speed, even if acceleration is applied when falling by its own weight,
Since it can be braked and lowered at almost the same speed as in normal times, the cage is not damaged and the occupant can be safely rescued.

[Brief description of drawings]

FIG. 1 is a perspective view showing an elevator provided with a rescue device according to the present invention.

FIG. 2 is a flowchart showing the sequence from the occurrence of power failure to rescue.

FIG. 3 is a plan view showing the internal structure of a centrifugal brake.

FIG. 4 is a vertical sectional view of the same.

[Explanation of symbols]

 1 Steel tower 2 Cage 3 Ball screw rod 4 Ball nut 5 Electric motor with brake 6 Battery 7 Centrifugal brake

Claims (1)

[Claims] 1. A ball nut (4) provided on a cage (2) is screwed onto a ball screw rod (3) standing upright on each floor, and the ball screw rod (3) is provided with an electric motor (5) with a brake.
A battery (6) for releasing the brake of the electric motor (5) in the event of a power failure in an elevator that rotates in the forward and reverse directions by installing a centrifugal brake (7) at the end of the ball screw rod (3) on the side opposite to the electric motor connecting side. An elevator rescue device characterized by being equipped with.