JPH07744Y2 - Electric hoist - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric hoist used when hoisting an elevator or the like.

[0002]

2. Description of the Related Art Conventionally, as an electric hoist used for hoisting an elevator or the like, an actual open hoist 62-153270 has been used.
An electric hoist having a braking device disclosed in Japanese Patent Publication is known.

[0003]

In the case of the conventional electric hoist, there is a problem that the structure of the brake device is complicated and the manufacturing cost is high, and the brake device is large and heavy.

[0004]

In order to advantageously solve the above problems, in the electric hoisting machine of the present invention, the electric motor 1
The hoisting drive pulley 5 is fixed to the output shaft 4 which is rotated by the rotary shaft 2 and the speed reducer 3, and the base of the pair of brake arms 7 facing the braked member 6 fixed to the rotary shaft 2. The ends are pivotally attached to the frame 8 by means of pivots 9,
In the electric hoist in which the tip of each brake arm 7 is pressed by the brake spring 10, each brake arm 7
At the tip of the pressure screw rods 11 arranged in series.
A casing 12 fixed to the frame 8 is arranged between the front end portions of the brake arms 7, and a solenoid 14 surrounding the guide cylinder 13 is arranged in the casing 12, and the inside of the guide cylinder 13 is Independent iron cores 15 are movably accommodated on both sides in the longitudinal direction, and the engaging members 16 facing the pressing screw rods 11 are slidably fitted to the iron cores 15 and the iron cores 15 facing each other. Is arranged to engage directly or indirectly with the inner end of the.

[0005]

1 to 10 show a first embodiment of the present invention, in which one end of a rotary shaft 2 is connected to a rotor shaft 17 of an electric motor 1 and the rotary shaft 2 is a box-shaped frame. 8 is supported via a bearing 18 and a lid / support member 20 is interposed between the end of the casing body 19 of the electric motor 1 and the end of the frame 8. One side of the lid / support member 20. The other side portion is fitted to the end portion of the casing body 19 and the end portion of the box-shaped frame 8, and a plurality of bolts (not shown) are arranged at intervals in the circumferential direction of the casing body 19. ) Is inserted into the bolt holes (not shown) of the casing body 19 and the lid / support member 20, and the screw holes (not shown) of the frame 8 are also inserted.
It is screwed to.

A drive pinion 21 having spiral teeth is integrally provided at the other end of the rotary shaft 2,
An output shaft 4 extending in a horizontal direction at right angles to is supported by a frame 8 via a bearing 22, and a winding drive pulley 5 for winding a winding rope is fixed to the output shaft 4. A large-diameter driven gear 23 having spiral teeth meshing with the drive pinion 21 is fixed, and the drive pinion 21 and the driven gear 23 constitute a speed reducer 3 composed of a hypoid gear.

A member to be braked 6 having a cylindrical outer surface is fixed to the rotary shaft 2, and a pair of brake arms 7 to which an arcuate brake lining 24 is fixed inside are arranged on both left and right sides of the member to be braked 6, The lower end of each brake arm 7 is pivotally attached to the frame 8 by a pivot 9 parallel to the rotary shaft 2. Further, a spring support screw rod 25 is inserted through the tip end side of each brake arm 7, and the spring rod 2 is attached.
5, a lock nut 26 and a lock nut 27
Washer 2 is screwed and is locked to one end of the screw rod 25.
8 and the tip of one of the brake arms 7, a brake spring 10 made of a spiral spring is interposed in a compressed state, and the brake arm 7 is pressed by the brake spring 10 so that the brake lining 24 is a member to be braked. Pressed on 6.

Pressing rods 11 arranged so as to be aligned in series are screwed onto the tip ends of the respective brake arms 7, and lock nuts 29 are screwed onto the pressing rods 11, whereby the leading end parts of the respective brake arms 7 are described. A casing 12 fixed to the frame 8 is arranged in between, and a brass guide cylinder 13 and a solenoid 14 surrounding the guide cylinder 13 are arranged in the casing 12, and both longitudinal ends of the guide cylinder 13 are arranged. In addition, an independent iron core 15 is housed movably in the longitudinal direction of the guide cylinder 13.

An inner small-diameter hole 30 and an outer large-diameter hole 31 are provided in each iron core 15, and a small-diameter shaft portion 32 fitted in the inner small-diameter hole 30 and a large diameter fitted in the outer large-diameter hole 31. The brass engagement member 16 including the shaft portion 33 is slidably fitted to the iron cores 15 in the longitudinal direction of the guide cylinder 13, and is engaged with the tip end portion of each brake arm 7 and each engagement portion. A weak pressing spring 34 for preventing the engagement member 16 from floating is interposed between the member 16 and the outer end surface of the large-diameter shaft portion 33.

When the solenoid 14 is energized, each iron core 15
Are moved toward each other, and the iron cores 15 rotate the brake arms 7 in the brake releasing direction via the engaging members 16 and the pressing screw 11, so that the brakes are released (Fig. 9 and FIG. 10).

When the energization of the solenoid 14 is stopped, the force of the brake spring 10 causes each brake arm 7 to move.
Are pressed and rotated in the brake tightening direction, and the engaging members 16 are engaged by the pressing screws 11 at the tips of the brake arms 7.
The iron cores 15 are moved in directions in which they separate from each other via (see FIGS. 4 and 5).

11 to 17 show a second embodiment of the present invention, in which each iron core 15 is slidably provided with a shaft-like engaging member 16 extending in the longitudinal direction of the guide cylinder 13. A pair of pressing members 36 are fitted and inserted into the large-diameter holes 35 provided at the inner ends of the iron cores 15.

When the solenoid 14 is energized, each iron core 15
Are moved toward each other, and the iron cores 15 rotate the brake arms 7 in the brake releasing direction via the pressing member 36, the engaging member 16, and the pressing screw 11, so that the brakes are released. To be done.

When the power supply to the solenoid 14 is stopped, the force of the brake spring 10 causes each brake arm 7 to move.
Are pressed and rotated in the brake tightening direction, and the engaging members 16 are engaged by the pressing screws 11 at the tips of the brake arms 7.
Also, the iron cores 15 are moved in directions away from each other via the pressing members 36.

[0015]

According to the present invention, the hoisting drive pulley 5 is fixed to the output shaft 4 rotated by the electric motor 1 via the rotary shaft 2 and the speed reducer 3, and the driven shaft fixed to the rotary shaft 2 is fixed. In the electric hoist in which the base end portions of the pair of brake arms 7 facing the braking member 6 are pivotally attached to the frame 8 by pivots 9 and the tip end portions of the brake arms 7 are pressed by the brake springs 10. A pressing screw 11 arranged so as to be aligned in series is screwed onto the tip of each brake arm 7, and the frame 8 is provided between the tip of each brake arm 7.
A casing 12 fixed to the casing 12 is arranged, and a solenoid 14 surrounding the guide cylinder 13 is arranged in the casing 12,
Independent iron cores 1 on both sides in the longitudinal direction in the guide cylinder 13
5 is movably accommodated, the engaging members 16 facing the pressing screw rods 11 are slidably fitted to the iron cores 15, and directly or indirectly with respect to the inner ends of the facing iron cores 15. Since the brake device has a simple structure, the electric hoist can be downsized, the brake device can be manufactured at low cost, and the rotation of the brake arm 7 can be prevented. The brake can be easily tightened and released with a small force.

[Brief description of drawings]

FIG. 1 is a partially longitudinal side view showing an electric hoist according to a first embodiment of the present invention.

FIG. 2 is a side view showing the electric hoist according to the first embodiment of the present invention.

FIG. 3 is a partial cross-sectional plan view showing the electric hoisting machine according to the first embodiment of the present invention.

FIG. 4 is a vertical cross-sectional front view showing a state in which the brake device in the electric hoisting machine according to the first embodiment of the present invention is operated.

5 is a vertical sectional front view showing a part of FIG. 4 in an enlarged manner. FIG.

6 is a cross-sectional view taken along the line AA of FIG.

7 is a sectional view taken along line BB of FIG.

8 is a cross-sectional view taken along the line CC of FIG.

FIG. 9 is a vertical cross-sectional front view showing a state in which the brake device of the electric hoisting machine according to the first embodiment of the present invention is opened.

FIG. 10 is a vertical sectional front view showing a part of FIG. 9 in an enlarged manner.

FIG. 11 is a vertical sectional front view showing a part of the electric hoist according to the second embodiment of the present invention.

12 is a cross-sectional view taken along line DD of FIG.

13 is a sectional view taken along line EE of FIG.

14 is a sectional view taken along line FF of FIG.

FIG. 15 is a side view of a pressing member used in the second embodiment of the present invention.

16 is a sectional view taken along line GG of FIG.

17 is a sectional view taken along line HH of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric motor 2 Rotating shaft 3 Reduction gear 4 Output shaft 5 Hoisting drive pulley 6 Braking member 7 Brake arm 8 Frame 9 Axis 10 Brake spring 11 Push screw rod 12 Casing 13 Guide cylinder 14 Solenoid 15 Iron core 16 Engaging member 17 Rotor Shaft 18 Bearing 19 Casing main body 20 Lid / support member 21 Drive pinion 22 Bearing 23 Driven gear 24 Brake lining 25 Bearing screw rod 26 Locking nut 27 Lock nut 28 Washer 29 Lock nut 30 Small inner diameter hole 31 Large outer diameter hole 32 Small diameter Shaft 33 Large-diameter shaft 34 Presser spring 35 Large-diameter hole 36 Pressing member

Claims (1)

[Scope of utility model registration request] 1. A rotating shaft 2 and a speed reducer 3 driven by an electric motor 1.
The hoisting drive pulley 5 is fixed to the output shaft 4 which is rotated via the base shaft of the pair of brake arms 7 opposed to the braked member 6 fixed to the rotary shaft 2 with respect to the frame 8. In an electric hoisting machine pivotally attached by a pivot 9 and pressing the tip of each brake arm 7 by a brake spring 10, a pressing screw 11 arranged in series is provided at the tip of each brake arm 7. Screw to each brake arm 7
A casing 12 fixed to the frame 8 is arranged between the front end portions of the two, and a solenoid 14 surrounding the guide cylinder 13 is arranged in the casing 12, and independent iron cores are provided on both sides in the longitudinal direction of the guide cylinder 13. 15 is movably accommodated,
An engaging member 16 facing each of the pressing screw rods 11 is slidably fitted to each iron core 15 and arranged so as to directly or indirectly engage with an inner end portion of the facing iron core 15. Electric hoist.