CN100343156C

CN100343156C - Electromagnetic braking apparatus

Info

Publication number: CN100343156C
Application number: CNB2003101029333A
Authority: CN
Inventors: 小野哲志; 西野义则; 森内明
Original assignee: Hitachi Ltd
Current assignee: Hitachi Ltd
Priority date: 2003-10-31
Filing date: 2003-10-31
Publication date: 2007-10-17
Anticipated expiration: 2023-10-31
Also published as: CN1611440A

Abstract

The present invention relates to an electromagnetic brake device for reducing problems caused by the retardation of slide parts, which comprises a first lever and a second lever (3a, 3b) of brake shoes (2a, 2b), brake springs (5a, 5b), an electromagnetic coil (9), a first rod type iron core, a second rod type iron core, an electric magnet part (7), a first pushing rod (11) of the first rod type iron core and a second pushing rod (13) of the second rod type iron core (12), wherein the brake shoes (2a, 2b) are positioned at the periphery or the inner surrounding surface of a brake drum; the brake springs (5a, 5b) apply brake force to the first lever and the second lever; the first rod type iron core and the second rod type iron core are arranged to carry out corresponding approach movement by energizing to the electromagnetic coil; the first rod type iron core and the second rod type iron core are respectively connected with the first lever and the second lever; by the approach movement in energization, the first lever and the second lever resist the brake force to enable the first pushing rod and the second pushing rod to move, and then, the electric magnet part (7) is formed; the first pushing rod (11) of the first rod type iron core is connected with the first rod type iron core, the second pushing rod (13) of the second rod type iron core (12) is connected with the second rod type iron core (12), and the first pushing rod (11) and the second pushing rod (13) are supported by the slide parts (22, 23) which are mutually dependent.

Description

Electro-magnetic braking device

Technical field

The present invention relates to electro-magnetic braking device, particularly relate to the electro-magnetic braking device that is suitable for as the electro-magnetic braking device use of elevator.

Background technology

With reference to the summary description figure of Fig. 4 in the past elevator is described with electro-magnetic braking device.In Fig. 4, the 1st, brake wheel, and the outer peripheral face that is provided with at this brake wheel 1 has a pair of

brake shoe

2a, 2b, a pair of

main lever

3a, 3b that its lower end is supported rotationally.Cross bar 4 is set on the top of this

main lever

3a, 3b with connecting, retarding

spring

5a, 5b is arranged in the arranged outside of this cross bar 4.6a, 6b are the nuts for fixing described retarding spring 5a, 5b.The 7th, electromagnet portion, this electromagnet portion 7 is by the housing 8 that suitably supports and form shell; Be fixed on the magnet coil 9 on this housing 8; First, second bar

type iron core

10,12 that relatively is provided with in the inboard of this magnet coil 9; First,

second push rod

11,13 that these first, second bar

type iron cores

10,12 is connected to described

main lever

3a, 3b constitutes.And the first bar type iron core 10 and first push rod 11 are maintained on the sliding part 16 of sliding

part

14,15 and magnet coil 9, and the second bar type iron core 12 and second push rod 13 are maintained on the sliding part 17 of sliding

part

14,15 and magnet coil 9.

Below, with reference to Fig. 5 (a) and (b) magnet coil 9 connections to electromagnet portion 7, the regular event when cutting off the electricity supply are described.Shown in Fig. 5 (a), work as energized, after magnet coil was energized, first, second bar

type iron core

10,12 was attracted each other.Thus, by first,

second push rod

11,13 extruding main lever 3a, 3b.By the effect of this extruding, retarding

spring

5a, 5b are compressed, and

main lever

3a, 3b rotate, and brake shoe is decontroled from brake wheel 1, discharges braking.

Under the normal condition that does not have retardance, after power supply disconnects, shown in Fig. 5 (b), because the energising to magnet coil is cut off, so first, second bar

type iron core

10,12 is no longer attracted each other, under the effect of retarding spring,

main lever

3a, 3b are pressed in

brake shoe

2a, 2b on the brake wheel 1, reach the braking of 100% lock torque.In addition, first, second bar

type iron core

10,12 moves to the direction of leaving mutually shown in Fig. 5 (b).And shown in Fig. 5 (c), when in A portion retardance taking place, though the first bar type iron core 10 is failure to actuate, the second bar type iron core 12 moves.So, because the effect of the retarding spring 5b of main lever 3b, on brake wheel 1, apply 50% lock torque by brake shoe 2.And take place in D portion under the situation of retardance, the second bar type iron core 12 is failure to actuate, but the first bar type iron core 10 moves, and by the effect of the retarding spring 5a of main lever 3a, can guarantee 50% lock torque.Particularly under the situation of the electromagnetic braking of elevator, owing to be to brake mobile the stopping of elevator box after, 50% lock torque also can be used as sufficient braking and works again.

But in described technology, if the retardance of B portion takes place, shown in Fig. 5 (d), two sides of the first bar type iron core 10 and second push rod 13 can not move.So lock torque is 0%, i.e. braking becomes wide-open state, and elevator box or counterweight become the personal breakneck state that falls.Make lock torque become 0% too when in addition, the retardance of C portion takes place.

Summary of the invention

Even the object of the present invention is to provide a kind of generation retardance, also can avoid making braking become the electro-magnetic braking device of the great state of affairs of wide-open state owing to lock torque becomes 0%.

In order to reach described purpose, electro-magnetic braking device of the present invention comprises: first, second lever with brake shoe of the periphery that is positioned at brake wheel or inner peripheral surface; Retarding spring to this first, second lever brake activation power; By magnet coil be configured to by carry out to this coil electricity relative near move first, the second bar type iron core and respectively with these first, the second bar type iron core and described first, second lever connects individually, approaching moving during by energising, make described first, second lever resistance braking force and mobile first, the electromagnet portion that second push rod constitutes is characterized in that: by first push rod and second push rod that be connected in described second bar type iron core and this second bar type iron core of separate sliding part support and connection in the described first bar type iron core and this first bar type iron core.

Owing to have such structure, even have a position retardance to occur at sliding part, other bar type iron core can move, and can not brake the problem of complete akinesia.

Description of drawings

Fig. 1 is all summary description figure of the electro-magnetic braking device of one embodiment of the present invention.

Fig. 2 is the instruction diagram of operating state of the electromagnet portion of presentation graphs 1.

Fig. 3 is all summary description figure of the electro-magnetic braking device of other embodiment of the present invention.

Fig. 4 is all summary description figure of electro-magnetic braking device in the past.

Fig. 5 is the instruction diagram of operating state of the electromagnet portion of presentation graphs 4.

Among the figure: 1-brake wheel, 2a, 2b-brake shoe, 3a, 3b-main lever, 5a, 5b-retarding spring, 7-electromagnet portion, 8-housing, 9-magnet coil, 10,12,30,31-bar type iron core, 11,13,35, the 36-push rod, 20,21,37, the 38-carriage, 22,23,40,41,42, the 43-sliding part

The specific embodiment

Below, the embodiment to electro-magnetic braking device of the present invention describes with reference to accompanying drawing.

Fig. 1 is all summary description figure of the electro-magnetic braking device of one embodiment of the invention, and Fig. 2 is the instruction diagram of operating state of the electromagnet portion of presentation graphs 1, and Fig. 3 is all summary description figure of the electro-magnetic braking device of other embodiments of the invention.

In Fig. 1～Fig. 2, with the same object of the expression of Fig. 4 prosign.20, the 21st, the carriage that is provided with on housing 8 is supporting

push rod

11,13 by this

carriage

20,21, is supported making it and can slide by sliding

part

22,23.

Then, the normal action during to energized and power cut-off on the magnet coil 9 of electromagnet portion 7 describes with reference to Fig. 2 (a) and (b).Shown in Fig. 2 (a), power connection, after magnet coil 9 was energized, first, second bar

type iron core

10,12 was attracted each other.Thus, by first,

second push rod

11,13 extruding main lever 3a, 3b.By the effect of this extruding, retarding

spring

5a, 5b are compressed,

main lever

3a, 3b rotation, and brake shoe is decontroled from brake wheel 1, discharges braking.

In the normal condition that does not have retardance, after power supply disconnects, shown in Fig. 2 (b), because the energising to magnet coil 9 is cut off, so first, second bar

type iron core

10,12 is no longer attracted each other, by the effect of retarding spring,

main lever

3a, 3b are pressed in

brake shoe

2a, 2b on the brake wheel, and lock torque 100% is applied in the braking.In addition, shown in Fig. 2 (b), first, second bar

type iron core

10,12 moves to the direction of leaving mutually.

And shown in Fig. 2 (c), when the retardance of A portion took place, the first bar type iron core 10 was failure to actuate, but the second bar type iron core 12 moves.So, because the effect of the retarding spring 5b of main lever 3b, on brake wheel 1, apply 50% lock torque by brake shoe 2.The situation of D portion retardance, the second bar type iron core 12 is failure to actuate, but the first bar type iron core 10 moves, and by the effect of the retarding spring 5a of main lever 3a, can guarantee 50% lock torque.

Then, under the B portion situation that just sliding part 22 takes place to block, shown in Fig. 2 (d), push rod 13 can not slide, but bar type iron core 10 and push rod 11 can slide.Therefore, main lever 3a is to the direction action of closing brake shoe 2a, and braking is partly closed, and applies 50% lock torque.In addition, when C portion, that is, and when retardance takes place in sliding part 23, push rod 11 can not move, but bar type iron core 12 and push rod 13 can move, therefore, main lever 3b is to the direction action of closing brake shoe 2b, and braking is similarly half off status with Fig. 2 (d), applies 50% lock torque.So the casing of elevator not shown in the figures or counterweight can freely not fall.

Then, with reference to Fig. 3 other embodiment of the present invention are described.In Fig. 3, with the same object of the expression of Fig. 4 prosign.30,31 expression bar type iron cores, in described bar type iron core 30, built-in electromagnetic coil 32.In described bar

type iron core

30,31,

push rod

33,34 and

strut bar

35,36 are set respectively.37, the 38th, carriage described

push rod

33,34, is being supported

strut bar

35,36 by these bracket support, forms sliding part 40～43.

In this embodiment, when retardance took

place sliding part

40 or 41, though push rod 34 can not move, bar type iron core 30, push rod 34, strut bar 35 moved, and can realize the semi-brake of drg.When retardance took

place sliding part

42 or 43, though push rod 33 can not move, bar type iron core 31, push rod 34, strut bar 36 moved in addition, can realize that half closes braking.Like this, in this embodiment, also can apply 50% lock torque.So, scheme unshowned elevator box or counterweight and can freely not fall.

According to the present invention, no matter block at any position of the sliding part of bar type iron core, though be half off status, the bar type iron core still can slide, and can keep 50% lock torque.So, can reach and avoid making casing or counterweight to be in the remarkable result of free-falling worst-status.

Claims

1. electro-magnetic braking device comprises:

First, second lever with brake shoe of the periphery that is positioned at brake wheel or inner peripheral surface;

Retarding spring to this first, second lever brake activation power;

Undertaken relative to approaching first, second bar type iron core that moves by switching on and respectively these first, second bar type iron cores are connected individually with described first, second lever with being configured to by magnet coil to this magnet coil, approaching moving during by energising, make described first, second lever resistance braking force and electromagnet portion that first, second mobile push rod constitutes, it is characterized in that:

By first push rod and second push rod that be connected in described second bar type iron core and this second bar type iron core of separate sliding part support and connection in the described first bar type iron core and this first bar type iron core.

2. electro-magnetic braking device as claimed in claim 1, it is characterized in that: the both sides at the housing that covers described first, second bar type iron core and magnet coil are provided with carriage, the sliding part of described first, second push rod is set on this carriage, and the sliding part of described first, second bar type iron core is set on described magnet coil.