JPH0466491A - Ropeless linear motor elevator - Google Patents

Abstract

PURPOSE:To instantly stop a cage in the case that the motive force is abnormally reduced by detecting the acceleration of the cage with an accelerometer and monitoring the cage with a monitoring part, and also operating a braking device when the acceleration is larger than the specified value. CONSTITUTION:A cage 11 is stopped by the frictional force caused between respective shoes 25, 26, 35 and 36, and respective rails 12 by means of energizing force of a spring. Meanwhile, the cage 11 is operated such that a motive body 14 moves a first brake device 13 and an operating lever 29 upwardly through motive force, thus releasing the braking. After that, the motive force is increased and the plunger is moved upwardly, thus releasing the braking of a second brake device 15. In elevation of the cage 11, when the motive force is abnormally reduced, and the output voltage from an accelerometer 17 of the cage 11 exceeds the specified value Va, no signal is outputted from a comparator 18 thereby applying no current to a transister 19. Thus, a relay contact B1 is released by a relay coil B. Therefore, the current-carrying for an electromagnetic coil 16 is stopped, thereby stopping the case 11 by the brake device 15 with safety. Furthermore, the power supply of the motive body 14 is cut-off by the relay contact B2.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a ropeless linear motor elevator-1, particularly a ropeless linear motor elevator in which a car moves up and down in a hoistway using the propulsive force of a linear motor without using a lobe. - related to

[Prior Art] FIG. 5 is a block diagram showing a conventional ropeless linear motor elevator similar to that shown in, for example, Japanese Utility Model Application No. 136476/1983.

In the figure, a plurality of coils (2) are arranged along the vertical direction on both side walls of the elevator 1-8 (1), and rails (3) extending in the vertical direction are provided. A plurality of permanent magnets (5) are provided on both sides of the elevator (4), which moves up and down in the hoistway (1) along the rail (3), so as to face the coil (2). .

In the conventional ropeless linear motor elevator as described in -1-, a synchronous linear motor is refined by a coil (2) and a permanent magnet (5), and the propulsive force of this linear motor is used to move the car (4). moves up and down along the rail (3).

[Problem to be solved by the invention] - In the conventional ropeless linear motor elevator refined as described in F, it is necessary to install a device that applies emergency braking when the propulsion force is abnormally reduced due to a failure etc. However, there was a problem in that safety was insufficient.

Furthermore, as is clear from the fact that rope-type elevators have come into widespread use despite the invention of a reliable emergency stop device in case the robes break, safety is insufficient as described above. Conventional ropeless linear motor elevators have had the problem of being difficult to put into practical use.

This invention was made with the aim of solving the above-mentioned problems, and it is possible to immediately stop the car when the propulsive force is abnormally reduced, thereby increasing safety. It is an object of the present invention to provide a ropeless linear motor elevator that can be operated and has sufficient practicality.

[Means for Solving the Problems] The ropeless linear motor elevator according to the present invention includes an accelerometer that detects the acceleration of the car, and a monitor that monitors whether the acceleration detected by the accelerometer is larger than a predetermined value. The car is equipped with a braking device that stops the car in accordance with the output from the monitoring unit when the part and the acceleration are larger than a predetermined value.

[Operation] In this invention, the accelerometer and the monitoring section detect and monitor the acceleration of the car, and when the acceleration is larger than a predetermined value, the braking device stops the car in accordance with the output from the monitoring section. .

[Example code] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram illustrating a main part of a ropeless linear motor elevator according to an embodiment of the present invention.

In the figure, a car (11) moves up and down along a rail (12) provided in a hoistway (not shown), as in the conventional case.

A propulsion body (14) is attached to the upper part of the car (11) via a first braking device t (13). This propulsion body (14) is a coil (not shown) provided in the hoistway.
The car (11) is moved up and down by the propulsive force of a linear motor made up of these coils and permanent magnets. Further, the first braking device (13) applies a brake when no propulsive force is generated in the propelling body (14), and releases the brake when a propulsive force is generated.

On the other hand, a second braking device (15) is attached to the lower part of the car (11) as a braking device of the present invention. This second braking device (15) is provided with an electromagnetic coil (16), and the brake is released by the electromagnetic force of this electromagnetic coil (16). In addition, the electromagnetic coil (16) has a contact (A) and a relay contact (B1).
It is connected to the power supply (E) via. Normally, the relay contact (B1) is closed, and the contact (A) connects and disconnects between the electromagnetic coil (16) and the power source (E).

The car (11) detects the acceleration of the car (11),
An accelerometer (17) is provided that outputs a voltage signal corresponding to the magnitude of the acceleration. This accelerometer (17)
The output signal is input to a comparator (18) as a monitoring unit connected to an accelerometer (17). Comparator (18
), a signal is output only when the input signal from the accelerometer (1)) is smaller than a predetermined value (for example, ■, ). This comparator (18) compares the output voltage of the accelerometer (17) with a predetermined value V, and determines whether the acceleration of the car (11) is larger than a predetermined value (value corresponding to V). is being monitored. The comparator (18) includes a transistor (
19), a relay coil (B) for opening and closing the relay contact (B1) is connected. Transistor (
19) is conductive when there is an output from the comparator (18), and is non-conductive when there is no output.

Further, the relay coil (B) opens the relay contact (B1) when the output signal from the comparator (18) disappears.

In addition, the cage (11) is provided with a relay contact (B2) that responds to the relay coil (B), and a comparator (18).
), the power to the propelling body (14) is cut off.

Next, FIG. 2 is a configuration diagram showing the first braking device (13) of FIG. 1.

In the figure, the first braking device F (13) includes first and second levers (23) and (24) that are rotatable about first and second fulcrums (21) and (22), respectively. ) is attached. First and second shoes (25) and (26) that are pressed against the rail (12) are attached to one end of each lever (23) and (24).

At the other end of each lever (23), (24), there is a first lever that biases each lever (23), (24) so as to press each shoe (25), (26) against the rail (12). and second springs (27) and (28).

Further, an operation bar (29) extends from the propelling body (12) into the first braking device F (13). A protrusion (29a) extends from the middle of the operation bar (29) to the left and right.
) stands out. Above and below this protrusion (29m),
Two bolts (30) are arranged, and the protrusion (2
9a) comes into contact with the bolt (30), the operation bar (29) and the first braking device (13) of the propelling body (14)
) relative vertical movement range is limited. 1i
A first operation section (29b) that protrudes left and right is provided at the lower end of the operation bar (29).

In this first operation section (29b), the operation bar (29) is the first brake bag! (13), each lever (23) moves against each spring (27), (28).
.

(24) and separate the shoes (25) and (26) from the rail (12).

Next, FIG. 3 is a configuration diagram showing the second brake bag 7 (15) of FIG. 1.

In the figure, the second braking device 1 (15) includes third and fourth levers (33) and (34) that are rotatable about third and fourth fulcrums (31) and (32), respectively. > is attached. Third and fourth shoes (35), (36) that are pressed against the rail (12) are attached to one end of each lever (33>, (34).

At the other end of each lever (33), (34), there is a third lever that biases each lever (33), (34) so as to press each shoe (35), (36) against the rail (12). and fourth springs (37) and (38).

Moreover, inside the electromagnetic coil (16), the electromagnetic coil (1
A plunger (39) that moves upward by the electromagnetic force of 6) is provided so as to be able to move up and down. At the lower end of the plunger (39), there is a second operation part (39a) extending left and right.
is provided, and when the plunger (39) moves, the second operating part (39) is activated by each spring <37),
Rotate each lever (33) (34) against the rail (38) and move each shoe (35), (36) to the rail (12).
).

Next, the operation will be explained. First, while the car (11) is stopped, the first brake bag! In (14), the propellant (14)
Since no propulsive force is generated, the operation bar (29) is in a lowered state. Therefore, the first and second shoes (25) and (26) are pressed against each rail (12) by the spring forces of the first and second springs (27) and (28). In addition, in the second brake bag W (15), the contact (A) is open, and the electromagnetic coil (16)
Since the plunger (39) is not energized, the plunger (39)
is in a downward position. For this reason, the third and fourth
The third and fourth shoes (35) and (36) are connected to each rail (12) by the spring force of the springs (37) and (38).
is pressed against. Each shoe like this (25)
, (26), (35).

The car (11) is stopped due to the frictional force between the car (36) and each rail (12).

Next, when starting up the car (11), whether ascending or descending, the propelling body (14) first moves upward with respect to the first brake bag W (1, 3) due to the propulsive force. Along with this, the operation bar (29) moves upward and the first brake bag is opened! (13) The brake is released. Thereafter, when the propulsive force of the propelling body (14) increases and becomes balanced with the car (11), the contact (A) is formed and the electromagnetic coil (16) is excited. As a result, the plunger (39) moves upward and the second brake bag ri! ? The brake of (15) is also released, and the brake of car (11)
starts to rise and fall smoothly.

Also, when the car (11) approaches the destination floor, the contact point (A)
is released, and the second braking device (+5) causes the car (11
) is stopped. Thereafter, the car (11) is stopped more reliably by gradually reducing the propulsive force of the propelling body (14) and applying the braking force of the first brake bag 7I (13).

By the way, if the propulsive force of the propelling body (14) is abnormally reduced for some reason while the car (11) is being raised or lowered, the car (11)
) acceleration increases rapidly. When the acceleration is larger than a predetermined value, that is, the output voltage from the accelerometer (17) exceeds a predetermined value, the comparator (18) no longer outputs a signal, and the transistor (19) becomes non-conductive. . Then, the relay coil (B) causes the relay contact (
B1) is released, the electromagnetic coil (16) is de-energized and the car (11) is safely stopped by the second braking device F (15). Furthermore, the power to the propellant (14) is cut off by the relay contact (B2).

Here, FIG. 4 is an rWJ diagram showing the relationship between the speed and acceleration of the car (11) and time from the start to the stop of the elevator as described above. ) is suppressed to about 0.1 g (g is gravitational acceleration). However, if a failure occurs in the propulsion body (14) and the propulsion force is abnormally reduced, the car (1)
The acceleration of immediately exceeds 0.1 g (for example, I
g) 3 Therefore, if the acceleration of the car (11) is detected by the accelerometer (17) as described above, and the detected acceleration is constantly monitored by the comparator (18), the propellant (14 If there is an abnormality in the car (1), promptly and safely
1) can be stopped.

In the J-biped embodiment, a comparator (18) is used as the monitoring unit, but a microcomputer may also be used, for example.

Further, in the above embodiment, the output from the comparator (18) is cut off when the acceleration of the car (11) is greater than a predetermined value, but conversely, a signal is output only when an abnormality occurs and the second The braking device (15) may be activated.

Furthermore, in the above embodiment, the accelerator clock (17) is
Although the accelerometer shown in 11) outputs a voltage signal according to the acceleration, it is sufficient that the accelerometer can output an output according to the acceleration, and is not limited to the above embodiment.
Further, the accelerometer (17) may be mounted on the car (11) side or on the hoistway side as long as it can detect the acceleration of the car (11).

Furthermore, in the above embodiment, a second braking device (15) is shown which applies the brake by spring force and releases the brake by electromagnetic force, but the braking device controls the car according to the output from the monitoring section. It is not limited to the above embodiments as long as it can be stopped. Furthermore, the mounting position of the braking device is not limited to the lower part of the car (11).

Further, - in the above embodiment, a propellant (14) that generates a propulsive force;
Although a ropeless linear motor elevator is shown which is installed above the car (11) and separately from the car (11), it may also be installed integrally with the side of the car as in the past. ) is not particularly limited. Also,
If it constitutes a linear motor, the propellant (14)
The structure of is also not limited to the above embodiment.

Further, in the ropeless linear motor elevator of the above embodiment, the first braking device (13) that operates depending on the presence or absence of the propulsive force of the propelling body (14) is used, but the first braking bag! (1
3) may be omitted.

Furthermore, in the above embodiment, when the acceleration of the car (11) exceeds a predetermined value, the relay contact (B2) activates the propelling body (14).
) is shown, but it may also be manually shut off without using the relay contact (B2).

[Effects of the Invention] As explained above, the ropeless linear motor elevator of the present invention uses an accelerometer to detect the acceleration of the car, and a monitoring unit to monitor the magnitude of this acceleration to detect abnormal propulsion force. When the acceleration decreases to a predetermined value, the braking device stops the car in accordance with the output from the monitoring unit, making it possible to stop the car immediately if the propulsive force decreases abnormally. This has the effect of increasing safety and sufficiently increasing practicality.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, FIG. 2 is a configuration diagram showing the first braking device in FIG. 1, and FIG. 3 is a configuration diagram showing the second braking device in FIG. 1. , FIG. 4 is a relationship diagram showing an example of the relationship between the speed and acceleration of the car and time from start to stop of the elevator shown in FIG. 1, and FIG. 5 is a configuration diagram showing a conventional example. In the figure, (11) is a ladder, (15) is a second braking device (braking device), (17) is an accelerometer, and (18) is a comparator (monitoring unit). In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] an accelerometer that detects the acceleration of the car; a monitoring unit that monitors whether the acceleration detected by the accelerometer is greater than a predetermined value; A ropeless linear motor elevator, comprising: a braking device that stops the car depending on the output.