JPH0643371U - Electric hoist - Google Patents

Abstract

(57) [Abstract] [Purpose] The structure of the brake device is simplified, the electric hoist is manufactured in a small size and at low cost, and the tightening and releasing of the brake are easily performed with a small force. [Structure] A pair of brake arms 7 in an electric hoist
At the tip of the pressure screw rods 11 arranged in series.
The casing 12 fixed to the frame is arranged between the tip ends of the brake arms 7 by screwing, and the solenoid 14 surrounding the guide cylinder 13 is arranged in the casing 12, and the length in the guide cylinder 13 is increased. Independent iron cores 15 are movably accommodated on both sides in the 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. It is arranged to directly or indirectly engage the inner end.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electric hoist used when hoisting an elevator or the like.

[0002]

[Prior art]

 Conventionally, as an electric hoist used for hoisting an elevator or the like, an electric hoist having a brake device disclosed in Japanese Utility Model Laid-Open No. 62-153270 is known.

[0003]

[Problems to be solved by the device]

 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]

[Means for Solving the Problems]

 In order to advantageously solve the above-mentioned problems, in the electric hoisting machine of the present invention, the hoisting drive pulley 5 is fixed to the output shaft 4 rotated by the electric motor 1 via the rotating shaft 2 and the speed reducer 3. Then, the base ends of a pair of brake arms 7 facing the member to be braked 6 fixed to the rotating shaft 2 are pivotally attached to the frame 8 by pivots 9, and the tip ends of the brake arms 7 are brake springs. In the electric hoisting machine which is pressed by 10, the pressing screw rods 11 arranged in series are screwed onto the tip end portions of the brake arms 7, and the frame 8 is provided between the tip end portions of the brake arms 7. A casing 12 fixed to the guide cylinder 13 is arranged, a solenoid 14 surrounding the guide cylinder 13 is arranged in the casing 12, and independent iron cores 15 are movably accommodated on both sides of the guide cylinder 13 in the longitudinal direction. Each press An engagement member 16 which faces the rod 11, thereby slidably fitted to each iron core 15, which urchin disposed by directly or indirectly engaged to the inner end of the opposing iron core 15.

[0005]

【Example】

 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. A support / bearing member 20 is interposed between the end of the casing main body 19 of the electric motor 1 and the end of the frame 8, and is supported via a bearing 18 and one side of the cover / support member 20. The other side portion is fitted to the end of the casing body 19 and the end 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 is screwed into the screw holes (not shown) of the frame 8.

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

A braked member 6 having a cylindrical outer surface is fixed to the rotary shaft 2, and a pair of brake arms 7 having arc-shaped brake linings 24 fixed to the inside are arranged on both left and right sides of the braked member 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 bearing screw rod 25 is inserted over the tip end side of each brake arm 7, and the spring rod 25 is attached. A locking nut 26 and a lock nut 27 are screwed into one end of the spring, and a spiral spring is provided between a washer 28 locked to one end of the screw rod 25 and the tip of one brake arm 7. The brake spring 10 is interposed in a compressed state, the brake arm 7 is pressed by the brake spring 10, and the brake lining 24 is pressed against the braked member 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 connected. 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 sides of the guide cylinder 13 are arranged. In addition, an independent iron core 15 is accommodated 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 into the inner small-diameter hole 30 and a large diameter fitted into the outer large-diameter hole 31. The brass engaging 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 the tip end portion of each brake arm 7 and each engaging portion. A weak pressing spring 34 for preventing the engagement member 16 from floating is interposed between the coupling member 16 and the outer end surface of the large-diameter shaft portion 33.

When the solenoid 14 is energized, the iron cores 15 are moved toward each other, and the iron cores 15 cause the brake arms 7 to release the brakes via the engaging members 16 and the pressing screw 11. The brake is released because it is rotated in the direction (see FIGS. 9 and 10).

When the energization of the solenoid 14 is stopped, each brake arm 7 is pressed and rotated in the brake tightening direction by the force of the brake spring 10, and each engagement is performed by each pressing screw 11 at the tip of each brake arm 7. The iron cores 15 are moved via the member 16 in the directions away from each other (see FIGS. 4 and 5).

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

When the solenoid 14 is energized, the iron cores 15 are moved toward each other, and the iron cores 15 move the brake arms 7 via the pressing members 36, the engaging members 16 and the pressing screw rods 11. The brake is released because it is rotated in the brake release direction.

When the energization of the solenoid 14 is stopped, each brake arm 7 is pressed and rotated in the brake tightening direction by the force of the brake spring 10, and each engagement is performed by each pressing screw 11 at the tip of each brake arm 7. The iron cores 15 are moved in directions away from each other via the members 16 and the pressing members 36.

[0015]

[Effect of device]

 According to the present invention, the hoisting drive pulley 5 is fixed to the output shaft 4 which is rotated by the electric motor 1 via the rotary shaft 2 and the speed reducer 3, and is opposed to the braked member 6 fixed to the rotary shaft 2. The base ends of the pair of brake arms 7 are pivotally attached to the frame 8 by pivots 9, and the tip ends of the brake arms 7 are pressed by the brake springs 10. A pressure screw rod 11 arranged so as to be aligned in series is screwed onto the tip portion of 7 and a casing 12 fixed to the frame 8 is arranged between the tip portions of the brake arms 7. A solenoid 14 surrounding the guide cylinder 13 is arranged in the guide cylinder 13, and independent iron cores 15 are movably accommodated on both sides in the guide cylinder 13 in the longitudinal direction, and an engaging member 16 facing each pressing screw 11 is provided. Slide on the iron core 15 Since it is freely fitted and arranged so as to directly or indirectly engage with the inner end portion of the facing iron core 15, the structure of the brake device is simple and the electric hoist can be downsized. At the same time, the brake device can be manufactured at a low cost, and the brake can be easily tightened and released by rotating the brake arm 7 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 Pressing screw rod 12 Casing 13 Guide cylinder 14 Solenoid 15 Iron core 16 Engaging member 17 Rotor Shaft 18 Bearing 19 Casing body 20 Lid / supporting 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 Inside small diameter hole 31 Outside large 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 facing 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 disposed between the tip ends of the solenoids, and a solenoid 14 surrounding the guide cylinder 13 is disposed in the casing 12, and independent iron cores are provided on both sides in the guide cylinder 13 in the longitudinal direction. 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 to directly or indirectly engage with an inner end portion of the facing iron core 15. Electric hoist.