JPH0459579A - Brake device of ropeless elevator - Google Patents

Abstract

PURPOSE:To prevent generation of an abnormal large deceleration in an emergent stopping by detecting the load in a cage, and controlling the control force corresponding to the detected load amount. CONSTITUTION:A differential transformer 12 which detects the load in a cage 2 converts the amount corresponding to the clearance with the floor of the cage 2 displaced by pressing an armature by bending the cage 2 floor, into an electric signal. A cage load detecting circuit 13 converts the weight of passengers in the cage 2 into the bending amount of the cage 2 floor, and the load in the cage 2 is detected depending on the output voltage of the differential transformer 12 which has converted the bending into the electric signal. And depending on this detecting output, the braking force of brake devices 10A to 10D is controlled. As a result, an abnormal large deceleration in the cage 2 in an emergent stopping can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a braking device for a ropeless elevator that does not use lobes.

(Prior Art) Figure 's4 is a block diagram showing a braking device for a ropeless elevator that has already been proposed. In the figure, (1) is the hoistway, (2) is the car, (3) is the floor, and (21) and (22) are the upper part that guides the car (2) along the rails (5) and (8). They are a guide roller and a lower guide roller. (10
) is a braking device to be described later, and braking shoes are provided at the bottom of the car (2) facing the rails (5) and (6), respectively. (30) is installed in the hoistway (1) or the primary side coil of the near motor, (40) is the height (2)
A permanent magnet is disposed on the side surface of the linear motor so as to face the primary coil (30) of the linear motor, and constitutes the secondary side of the linear motor. (100) A variable voltage variable frequency control device (hereinafter referred to as a VVVF device) that drives the primary coil (30) of the beam near motor. Regarding the VVVF device (100), for example, Japanese Patent Laid-Open No. 61-17028
Since this is disclosed in Publication No. 7, etc., the details will be omitted here.

Moreover, FIG. 5 shows the braking device of this elevator, and this braking device (10) consists of braking shoes (10a) provided on opposite sides of the guide rail (6).
Spring (10b) that presses the brake system (10a) against the guide rail via the lever (IOC);
c) It is fixed to the bottom of the car (2), and when it is energized, it attracts the rondo (10r) against the spring and releases the brake shoe (
10a) in the open position! Magnet device (10d)
, a rond (10r), and a pin (10p) fixed to the car (2) and rotatably supporting the lever (10c).

Next, we will discuss the operation. When a start command is issued, the electromagnetic device (10d) is energized and the braking device (10) is brought into an open state. The VVVF device (100) generates alternating current of a predetermined voltage frequency in accordance with a predetermined speed command signal and applies it to the negative side coil (30), and the resulting moving magnetic field drives the car (2) up and down. When arriving at the destination floor, the braking device (10) stops the heel (2) and the VVV
The F device (100) de-energizes the negative side coil (30).

Normally, this braking device holds the car (2) on the guide rail by deenergizing the electromagnetic device (10d) each time the car (2) stops at the destination floor.

In addition, when an emergency stop is made using the emergency stop button, etc., the VVVF
The device (100) works to de-energize the secondary coil (30) and actuate a braking device to hold the car.

[Problem to be solved by the invention]

Since the braking device of a conventional ropeless elevator is configured in this way, the acceleration inside the car when an emergency stop is applied is as follows. That is, the braking force F6 of the braking device is set so that even when the car is under the rated load W, when the elevator makes an emergency stop, the elevator can be decelerated and stopped at a predetermined deceleration α. Next, this braking force F and the car internal speed α8 at which the car makes an emergency stop when there is no load inside the car are extremely large values as shown below, and the mlE that is applied to the passengers in the car becomes a problem.

Now, assuming that the cage plate is Wc and the gravitational acceleration is g, the braking force FB is set as follows.

Fa= (Wc+11r) X (1+αr/g)
(1) Also, this braking force F, when an emergency stop is applied when there is no load on the inside, becomes the following equation.

Fa=11cX(1+αs/g) (2
) We; Wr, α, = g + 2 α, (3) α, = 0.4 g is set, so α8 = 1.
This is a large value of 8g.

This invention was made in order to solve the problems of the conventional method as described above, and provides a braking device for a ropeless elevator that can prevent the deceleration from becoming abnormally large during an emergency stop even if the load inside the car changes. It provides:

(Means for Solving the Problems) A braking device for a ropeless elevator according to the present invention is provided in a ropeless elevator in which an elevator car is directly driven by a linear motor. and a braking force control means for variably controlling the braking force in accordance with the braking force.

[Effect]

In this invention, the load inside the car is measured by the car own load detection means, and the braking force of the braking device is controlled by the braking force control means based on the output thereof, thereby reducing the deceleration inside the car at the time of an emergency stop. Make sure it does not become abnormally large.

〔Example〕

The present invention will be explained below based on illustrated embodiments.

FIG. 1 shows an embodiment of the present invention, and FIGS. 2 and 3 are diagrams for explaining its operation.

In Figure 1, (IOA), (IOB), (
IOC) and (IOD) are braking devices with the same structure as the braking device shown in Figure 5, (11) is a vibration isolating rubber that displaces according to the load inside the car, and (12) shows the load inside the car due to the displacement of the floor of the car. This is a differential transformer that detects the displacement of the armature due to the deflection of the car floor, which converts the amount of displacement between the armature and the car floor into an electrical signal. (13) is a car that converts the weight of passengers inside the car into the amount of deflection of the car floor, and detects the load inside the car based on the output voltage of the differential transformer (12) that converts the amount of deflection into an electrical signal. The internal load detection circuit (14) is an electromagnetic relay that operates in response to the output of the internal car load detection circuit;
(14a) is a normally closed contact of the electromagnetic relay, and (15) is a circuit that drives the electromagnet device (10d) of the braking device.

Note that (2a) and (2b) indicate the car frame and the car room.

Fig. 2 shows the operation of the car load detection circuit (13) and the electromagnetic relay (14). In the figure, when the car load is 1/2 of the rating, that is, 0.5WF or less, The electromagnetic relay (14) is energized, and when the voltage exceeds 0.5 W, the electromagnetic relay (14) is de-energized. Furthermore, FIG. 3 shows the braking force of the braking device corresponding to the load inside the car.

Next, the operation will be explained. Braking device (IOA) above
, (IOB), (IOC), and (100) are equal, and the combined braking force when all four are activated is set to be F6 in equation (1). now,
Load W inside the car is 0.5W, <WS2.0W.

At this time, the electromagnetic relay (14) is not excited, so its contact (14a) is closed. Therefore, in case of an emergency stop, the braking device (10^), (IOB), (IOC)
, (IOD) everything works. The braking force at this time becomes FB as shown in FIG.

Next, if the car load W is 0≦1. At the time of OWr, the electromagnetic relay (14) is energized, so its contact (14a) is opened. Therefore, in the event of an emergency stop, the braking devices Cl0A), (IOB), and (10C) are activated. The braking force at this time is FB as shown in Figure 3.
This results in 75% of the braking force.

In the above embodiment, the braking force is switched in one step, but it is not limited to - steps, and can be made smaller than the deceleration by increasing the number of switching steps.

Further, although a method in which a plurality of braking devices are provided as a means for varying the braking force is used, a similar effect can be obtained by a method in which the braking force is varied by controlling the current in the electromagnet coils of the - number of braking devices.

〔Effect of the invention〕

As described above, according to this invention, the braking force of the braking device is changed according to the load inside the car (car weight), so even if the load inside the car changes, the deceleration during an emergency stop is large. You can prevent this from happening.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of the present invention, Figs. 2 and 3 are operational characteristic diagrams of the relay and braking device, Fig. 4 is a block diagram of a conventional example, and Fig. 5 is a block diagram of the braking device. It is. (2): Basket, (IOA) to (100): Braking device, (12): Differential transformer, (13): Basket whitefish load detection circuit, (14): Electromagnetic relay, (15): Magnet drive circuit . In each figure, the same reference numerals indicate the same or corresponding parts. [==

Claims (1)

[Claims] A ropeless elevator in which an elevator car is directly driven by a linear motor, characterized by comprising a load detection means for detecting the load in the car, and a braking force control means for variably controlling the braking force according to the detected load amount. Braking device for ropeless elevators.