JPH0796432B2 - Linear motor drive elevator - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a brake device for a rope type elevator that moves up and down by a linear motor.

[Conventional technology]

8 to 10 (a) and (b) show a conventional traction type elevator apparatus, in which (1) is an elevator hoistway provided inside a building (not shown), and (2) is In the machine room provided in the upper part of the hoistway (1), a plurality of through holes (2a) are formed in the floor of the machine room (2) as shown in FIG.

(3) is a plurality of large and small sheaves rotatably arranged in the machine room (2).
As shown in Fig. 10, a plurality of special V-shaped grooves (3a) having a V-shaped cross section or undercut grooves (3b) having a funnel-shaped cross section are engraved in parallel, and these V-shaped grooves (3a) or The undercut groove (3b) serves to ensure proper friction between the sheave (3) and a main rope (4) described later.

(4) is a main rope wound around the V-shaped groove (3a) or undercut groove (3b) of the sheave (3), and the main rope (4) penetrates the through hole (2a). Are arranged in the hoistway (1). (5) is an elevator car that is attached to one end of the main rope (4), and (6) is a counterweight that is suspended from the other end of the main rope (4).

(7) is a normal rotary motor arranged in the machine room (2), and the output shaft of this motor (7) is installed at the center of the large diameter sheave (3) as shown in FIG. The sheave (3) is rotated by the drive of the motor (7) to move the elevator car (5) up and down.

Reference numeral (8) is a brake wheel interposed between the motor (7) and the sheave (3). As shown in FIG. 8, the brake wheel (8) includes the sheave (3) and the motor (3). It is arranged so as to be coaxial with 7). (9) is a curved brake shoe arranged so as to face the circumferential surface of the brake wheel (8), and (10) is an actuator (motor) for moving the brake shoe (9).
Then, based on the drive of this actuator (10), the brake shoe (9) is brought into pressure contact with or separated from the brake wheel (8) to stop or rotate the sheave (3) (Fig. 8). reference).

Therefore, the sheave (3) rotates based on the drive of the energized motor (7), and the main rope (4) is rubbed with the V-shaped groove (3a) or the undercut groove (3b) to cause the sheave to move. It is sent out in the rotation direction of (3) to raise or lower the elevator car (5).

And when the elevator car (5) approaches the target floor,
By driving the actuator (10) based on the stop of the motor (7), the brake shoe (9) is pressed against the brake wheel (8) to stop the sheave (3) and the main rope (4).
Stops due to friction with the V-shaped groove (3a) or the undercut groove (3b) and stops the elevator car (5) at the target floor.

However, in this type of elevator, since the friction between the sheave (3) and the main rope (4) plays an important role, the sheave (3) has the above-mentioned special V-shaped groove ( 3a) or the undercut groove (3b) was carved so that slippage did not occur between the sheave (3) and the main rope (4).

However, if the V-shaped groove (3a) or the undercut groove (3b) is engraved on the peripheral surface of the sheave (3), the friction force can be secured, but the main rope (4) has the thin V-shaped groove. (3a) or the undercut groove (3b) bites into the undercut groove (3b), resulting in a very short life.

Therefore, in the past, as shown in FIGS. 11 and 12, a linear motor was used instead of the motor (7) to correct the above-mentioned harmful effects. FIG. 11 is a diagram showing a conventional linear motor type elevator, and FIG. 12 is an operation characteristic diagram of the linear motor type elevator.

In the figure, (11) is a primary winding (fixed portion) of a linear motor vertically installed via a mounting member on a side wall of a hoistway (1) in a building, and the primary winding (11) and the counterweight mentioned above. Together with (6) constitutes a linear motor, the primary winding (11) is energized by being energized to cause the counterweight (6) to rise and the elevator car (5) to descend. It is like this. Thus, the counterweight (6) has a function as a secondary conducting wire (movable part) of the linear motor in addition to the function as a counterweight.

On the other hand, in FIG. 12, (a) is a brake release point or acceleration start point, (b) is a rated speed arrival point, (c) is a deceleration start point, (d) is a brake engagement point, and (e) is a system. It is a stopping point. Other parts are the same as those shown in FIGS. 8 to 10 (a) and (b).

Therefore, to lower the elevator car (5), the 12th
At the point (a) in the figure, the brake shoe (9) is opened, and the primary winding (11) is energized to generate a moving magnetic field from the bottom to the top to raise the counterweight (6). Then, the main rope (4) is sent out to the elevator car side via the sheave (3) to lower the elevator car (5). At this time, the friction is not involved between the sheave (3) and the main rope (4).

And when the elevator car (5) approaches the target floor,
At the point (c) in FIG. 12, the power supply to the primary winding (11) is stopped to start decelerating the elevator car (5) and the counterweight (6), but a point (d) slightly after this deceleration. Drive the actuator (10) to stop the elevator car (5) and the counterweight (6). In this braking, the brake shoe (9) is brought into pressure contact with the brake wheel (8) to stop the sheave (3) and maintain the stopped state, and friction force is used.

Although the conventional linear motor type elevator as described above can certainly eliminate the friction when the elevator car (5) is moved up and down, it requires a frictional force to stop and hold the sheave ( There was no choice but to engrave V-shaped groove (3a) or undercut groove (3b) in 3).

As a prior art document of this type, Japanese Patent Laid-Open No. 121568/1982
No. 62-38272, Japanese Utility Model Publication No. 54-139461.

[Problems to be Solved by the Invention]

The conventional linear motor type elevator is configured as described above, and the friction force is indispensable for stopping and holding the elevator car (5) and the counterweight (6). A special V-shaped groove (3a) or an undercut groove (3b) has to be engraved on the peripheral surface, which causes a problem that the life of the main rope (4) is extremely shortened.

The present invention has been made in view of the above points, and an object of the present invention is to provide a linear motor drive elevator in which the V-shaped groove or the undercut groove can be omitted and the main rope can be used for a long period of time.

[Means for Solving the Problems] In order to achieve the above-mentioned object in the present invention, a rotatable sheave arranged at an upper part of an elevator hoistway and an elevator hoistway wound around the sheave. The main ropes arranged inside,
An elevator car connected to one end of the main rope, a counterweight connected to the other end of the main rope, and a linear motor that is arranged opposite to the counterweight or the elevator car to move up and down the elevator car by being excited. The linear motor drive elevator is configured by a primary winding and a braking mechanism that holds and holds the main rope stopped by demagnetizing the primary winding of the linear motor.

[Action]

According to the present invention, a rotatable sheave arranged on the upper part of the elevator hoistway, a main rope wound on the sheave and arranged in the elevator hoistway, and one end of the main rope A connected elevator car, a counterweight connected to the other end of the main rope, and a primary winding of a linear motor that moves up and down the elevator car by being opposed to the counterweight or the elevator car and excited. Since the linear motor drive elevator is composed of a braking mechanism that holds and holds the main rope stopped by demagnetizing the primary winding of the linear motor, the V-shaped groove or the undercut groove is omitted and the main rope is long-term. It can be used for a long time.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to an embodiment shown in FIGS. 1 to 4. In the drawings, (3) is a plurality of sheaves of large and small sizes arranged rotatably in a machine room (2). Then, although this sheave (3) has a normal semicircular steel groove, unlike the conventional example, it does not have a V-shaped groove (3a) or undercut groove (3b) of a special shape.

(12) is a braking mechanism according to the present invention arranged in a machine room (2). This braking mechanism (12) is used for a large diameter sheave (3) as shown in Figs. A pair of plate-shaped brake shoes (12a), (12b) for holding the wound main rope (4), and brakes attached to the opposing surfaces of the pair of brake shoes (12a), (12b), respectively. It consists of a lining (12c). Further, (13) is an actuator composed of a reciprocating rod, and one end of this actuator (13) is attached to one (12a) of the pair of brake shoes (12a), (12b). 13)
The movable brake shoe (12a) is superposed on the fixed brake shoe (12b) via the main rope (4) and is held by the movable brake shoe (12a). Other parts are the same as the conventional example.

Therefore, to lower the elevator car (5), the fourth
At the point (a) in the figure, the brake shoes (12a) and (12b) are opened, and the primary winding (11) is energized to generate a moving magnetic field from the bottom to the top to raise the counterweight (6). .
Then, the main rope (4) is sent out to the elevator car side via the sheave (3) to lower the elevator car (5). At this time, no friction is generated between the sheave (3) and the main rope (4) as in the conventional example.

Then, when the elevator car (5) approaches the target floor,
At point (c) in FIG. 4, the current supply to the primary winding (11) is controlled to start to decrease, and the elevator car (5) and the counterweight (6) start to slow down. Then, when the elevator car (5) approaches the target floor, the current is controlled so that the elevator car (5) stops at the stop target position, and the elevator car (5) is stopped. Also in this case, no friction is involved between the sheave (3) and the main rope (4). Then, the actuator (13) is driven in synchronization with the stop of the elevator car (5), and the pair of brake shoes (12
The a) and (12b) are made to hold the main rope (4) which is completely stopped, and the stopped state is maintained.

In the above operation, the brake shoes (12a), (12b)
There is no relative sliding movement between the main rope (4) and the main rope (4) or between the sheave (3) and the main rope (4), and therefore the sheave (3), the main rope (4) and the brake shoe. (12a), (1
It is possible to completely prevent the occurrence of wear in 2b). Furthermore, since the brake linings (12c) are heavy-weighted on the brake shoes (12a) and (12b), the brake shoes (12a) and (1
It is possible to prevent the main ropes (4) from being damaged even if 2b) is accidentally operated and pinched.

However, according to the present invention, when the main rope (4) and the elevator car (5) are stopped, the friction between the sheave (3) and the main rope (4) is not used at all, and the stop is performed by the current control of the linear motor. Since it is made to do so, it is not necessary to engrave the V-shaped groove (3a) or the undercut groove (3b) of a special shape on the peripheral surface of the sheave (3), and the main rope (4) is used for a long time. It becomes possible to do.

Next, FIGS. 5 to 7 show another embodiment of the present invention. In this case, instead of omitting the fixed brake shoe (12b), the fixed brake shoe is attached to the sheave (3). I am trying to play the role of (12b).

In this embodiment, when stopping the elevator car (5), the brake lining (12) of the brake shoe (12a) is
The friction between the c), the main rope (4) and the ordinary rope groove of the sheave (3) is used, but especially the main rope (4) is bitten into the rope groove of the sheave (3). Since it is not necessary to process the rope groove into the above-mentioned special shape, it is possible to expect the same effect as that of the above-mentioned embodiment. Further, according to this embodiment, the sheave (3) is made to function as the brake shoe (12b), so that the structure of the braking mechanism (12) can be simplified.

〔The invention's effect〕

As described above, according to the present invention, it is possible to provide a linear motor drive elevator in which the V-shaped groove or the undercut groove having a special shape is omitted and the main rope can be used for a long time.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing an embodiment of a linear motor drive elevator according to the present invention, FIG. 2 is an enlarged view showing a braking mechanism and an actuator according to the present invention, and FIG. 2 is a sectional explanatory view of FIG. 2, FIG. 4 is an operation characteristic diagram of a linear motor drive elevator according to the present invention, FIG. 5 is an explanatory view showing another embodiment of the linear motor drive elevator according to the present invention, and FIG. FIG. 7 is an enlarged view showing a braking mechanism according to another embodiment of the present invention.
6 is a sectional explanatory view of FIG. 6, FIG. 8 is an explanatory view showing a conventional traction type elevator, FIG. 9 is an explanatory view of a main part of FIG. 8, and FIGS. 10 (a) and 10 (b) are V-shaped. 11 is an explanatory view showing a groove and an undercut groove, FIG. 11 is an explanatory view showing a conventional linear motor type elevator, and FIG. 12 is an operation characteristic diagram of a conventional linear motor type elevator. In the figure, (1) is the elevator hoistway, (2) is the machine room,
(3) is a sheave, (4) is a main rope, (5) is an elevator car, (6) is a counterweight, (11) is a primary winding of a linear motor, (12) is a braking mechanism, and (13) is It is an actuator. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A rotatable sheave disposed on an upper part of an elevator hoistway, a main rope wound on the sheave and arranged in the elevator hoistway, and connected to one end of the main rope. The elevator car, a counterweight connected to the other end of the main rope, and a primary winding of a linear motor that is placed facing the counterweight or elevator car to move the elevator car up and down by excitation. A linear motor drive elevator comprising: a braking mechanism that holds and holds a main rope stopped by demagnetizing a primary winding of the linear motor.