CN203570877U - Lift drum-type brake loosing device and lift drum-type brake - Google Patents

Abstract

The utility model relates to a lift drum-type brake loosing device and a lift drum-type brake. The lift drum-type brake loosing device comprises a first iron core arranged in the mode of being capable of moving back and forth between a first position and a second position, a first coil matched with the first iron core, a second iron core arranged in the mode of being capable of moving back and forth between a third position and a fourth position, and a second coil matched with the second iron core. The first iron core and the second iron core are arranged in a back-to-back mode. A brake loosing groove is formed between the first iron core and the second iron core. The lift drum-type brake loosing device further comprises a first one-way brake loosing rotating shaft and a second one-way brake loosing rotating shaft. The first one-way brake loosing rotating shaft and the second one-way brake loosing rotating shaft are respectively and rotatably arranged in the brake loosing groove. The first one-way brake loosing rotating shaft is matched with the first iron core so as to drive the first iron core to move from the first position to the second position far away from the second iron core. The second one-way brake loosing rotating shaft is matched with the second iron core so as to drive the second iron core to move from the third position to the fourth position far away from the first iron core. The lift drum-type brake loosing device can enable brake devices on the two sides to be loose independently through independent moving of the first iron core and independent moving of the second iron core.

Description

A kind of elevator drum brake brake-releasing gear and elevator drum brake

Technical field

The utility model relates to elevator brake brake-releasing gear and elevator brake, more particularly, relates to a kind of elevator drum brake brake-releasing gear and elevator drum brake.

Background technique

Elevator is the electromechanical equipment that overcomes gravity vertical motion, and break is the very important safety component of elevator, once lose efficacy, may cause used during elevator falling, rush to summit, open the door operation so that personnel are subject to shearing the serious consequences such as injury.So the braking system of elevator, except electric braking, also should have the break of a machine-electric formula frictional in accordance with regulations, it has had both the function of parking braking and service brake.

The main pattern of elevator brake has drum-type and disc type, drum brake due to simple in structure, cost is lower, be widely used in asynchronous motor hoist machine and quite most synchronous machine hoist machine, comprised that most freight elevators and a considerable amount of passenger lift all adopt such break.In these drum brakes, in most designs, be all only equipped with a set of manual brake release, Fig. 7 is to Figure 10 shows that modal a kind of elevator drum brake.

Its by being positioned at break upper end, be assemblied in declutch coil 13 ', 15 ' and two of two groups of a cylinder type cavity 11 ' and be subject to its iron core 12 ', 14 ' of controlling, can outwards moving, and grouping is installed in both sides and can plays two groups of break mechanical components 30 ', 40 ' of independent brake effect and form.Wherein, one group independently break mechanical component 30 ' comprised that the iron core 12 ' gap of declutching adjusts the mechanical parts such as bolt 32 ', holddown spring 34 ', brake arm 31 ' and brake block 33 ', be designated hereinafter simply as one group of brake unit, another group brake unit 40 ' is symmetrical installing.When break is not worked, coil 13 ', 15 ' no electric circuit, under holddown spring 34 ', 44 ' pressure, both sides brake block 33 ', 43 ' is adjacent to brake hub 20 ' (brake hub is connected with driving the traction sheave of elevator lifting), and break is in braking state; While needing releasing brake device, coil 13 ', 15 ' energising, under the effect of electromagnetic force, iron core 12 ', 14 ' opens to both sides, overcome holddown spring 34 ', 44 ' pressure opens the brake arm 31 ', 41 ' being attached thereto, brake block 33 ', 43 ' discharges, brake hub 20 ' brake off state.

Under elevator power failure or fault state, carry out emergency rescue service, in the time of need to manually emitting in elevator cab trapped personnel, need moving elevator car first to the position flushing with floor elevator door, could by personal security in elevator open the door and emit; Maintenance and inspection elevator, also needs manual moving elevator if desired, and aforesaid operations all need to be by the manual emergency operation to elevator.The first step as manual emergency operation, first needs manual release elevator brake, the operation of namely manually declutching.

Elevator drum brake in correlation technique is when manually declutching operation, the spanner 171 ' that needs to declutch vertically inserts the lock-joint that the two-way rotating shaft 17 ' of declutching is positioned at break upper end, operator holds the spanner 171 ' that declutches perpendicular to the two-way rotating shaft 17 ' of declutching, level is pulled the spanner 171 ' that declutches to the left or to the right, make the two-way rotating shaft 17 ' of declutching of brake inside rotate (seeing E '-E ' enlarged view of Fig. 8 and Fig. 9), the pressure that overcomes break both sides holddown spring 342 ' struts the iron core 12 ' of the two-way rotating shaft 17 ' left and right sides of declutching, 14 ', iron core 12 ', 14 ' pushes two ends open is fixed on brake arm 31 ', bolt 32 ' is adjusted in the gap of declutching on 41 ', 42 ', make the brake arm 31 ' of both sides, 41 ' and brake block 33 ', 43 ' opens, whole drum brake is all discharged, brake off state.

At < < elevator, manufacture and install in safety standard > > (GB7588-2003), the machine of elevator-electric formula break is had to following provisions:

When car is loaded with 125% load rating and move downwards with rated velocity, operational brake should be able to make hoist machine shut down.In these cases, the retardation of car should not surpass the retardation that catch block action or car cushion at collision produce.

The break mechanical part that all participations apply braking force to Brake drum or the dish installing of should dividing into groups.If one group of parts is inoperative, should still has enough braking force to make to be loaded with load rating and slow down descending with the descending car of rated velocity.

As can be seen here, important safety parts as elevator, GB7588-2003 is having certain safety redundancy requirement to elevator brake aspect stopping power, can make to be loaded with the car of 125% load rating and shut down with the descending hoist machine of rated velocity when break is normally worked; Aspect reliability, require mechanical part grouping installing, if wherein one group of mechanical part is inoperative, it is descending with the descending car deceleration of rated velocity that another group parts still have enough braking force to make to be loaded with load rating.

But in the daily inspection that elevator brake is carried out, we once found, such device processed due to the gap of declutching adjust bolt 32 ', 42 ' and holddown spring 34 ', 44 ' impacting force adjust not in place, or iron core 12 ', 14 ' inside have corrosion, break flour, or the reason such as brake shoe 33 ', 43 ' wearing and tearing, for a long time in only having one group of brake unit at the state of work.In the initial stage of only having one group of brake unit to work, elevator often also can normally be worked, due to brake block 33 ', 43 ' and brake hub 20 ' between gap very little, the one group of brake block 33 ' many times losing efficacy or 43 ' looks and seems to be still fitted on brake hub 20 ' when elevator brake, above-mentioned situation relies on range estimation often can not to be found easily, to elevator, operation has left sizable potential safety hazard for this, after overload or another group brake unit occur also going wrong, can cause elevator safety accident.

In the process of the test of such drum brake stopping power of check, because two groups of brake units of break move simultaneously, the stopping power of the single group break mechanical part requiring in GB7588-2003 fails to be verified, if exist the usefulness of single group or two groups brake unit to reduce or single group total failure, be also difficult to find according to existing stop test method.

In addition, at < < elevator, manufacture and install in safety standard > > (GB7588-2003), elevator hand device for emergency operation is had to following provisions:

The elevator drive main frame of manual emergency operation equipment is housed, should be able to and need to keeps its releasing orientation with a vitality with hand release brake.

When use is manually declutched, in requisition for using vitality could keep the releasing orientation of break, that is to say, and operator loose one's grip while no longer applying vitality, the spanner 171 ' that declutches is answered return, and brake block 33 ', 43 ' recovers nature, makes break brake sticking brake.Yet, such break adopts the single spanner 171 ' that declutches because design is upper, while once occurring manually declutching in practical operation, there is mechanical jam in the two-way rotating shaft 17 ' of declutching of brake inside, interact and make two groups of brake arms 31 ', 41 ' keep opening return in time, the accident that causes break always to be rushed to summit in the state of opening a sluice gate, elevator coaster out of control with iron core 12 ', 14 '.

Trace it to its cause, the problems referred to above are relevant with the structural feature of such break, and it exists following problem:

1. be while checking one group of mechanical part of break inoperative, whether another group machinery group has enough braking force to make to be loaded with load rating slows down descending with the descending car of rated velocity, designed break should have corresponding testing apparatus, but regrettably such widely used elevator drum brake lacks such testing apparatus.

2. on the other hand, when manually unclamping such break, the iron core 12 ', 14 ' of two groups of braking device only relies on a two-way rotating shaft 17 ' of declutching to open simultaneously, and interacts, this mechanical device that manually declutches is not completely independently in design, and safety reliability is not enough.

Model utility content

The technical problems to be solved in the utility model is, a kind of improved elevator drum brake and brake-releasing gear thereof are provided.

The utility model solves the technological scheme that its technical problem adopts: construct a kind of elevator drum brake brake-releasing gear, comprising can be at the first iron core installed that moves around between primary importance and the second place, the first coil matching with described the first iron core, the second iron core of installing and the second coil matching with described the second iron core can move around between the 3rd position and the 4th position, described the first iron core, the second opposing setting in iron core interval, and be formed with the groove that declutches between described the first iron core, the second iron core, it is characterized in that

This elevator drum brake brake-releasing gear also comprises the first unidirectional declutch rotating shaft and the second unidirectional rotating shaft of declutching in the groove that declutches described in being arranged on rotationally respectively,

Described the first unidirectional rotating shaft of declutching coordinates with described the first iron core, to drive described the first iron core to be moved to the second place away from described the second iron core by described primary importance; Described the second unidirectional rotating shaft of declutching coordinates with described the second iron core, to drive described the second iron core to be moved to the 4th position away from described the first iron core by described the 3rd position.

Preferably, described the first unidirectional rotating shaft side of declutching is provided with at least one first lug boss, the axis that described at least one first lug boss is located at described the first unidirectional rotating shaft of declutching is to the side of described the first iron core end on projection direction, and away from described the second iron core near described the first iron core;

Described the second unidirectional rotating shaft week of declutching is upwards provided with at least one second lug boss, the axis that described at least one second lug boss is located at described the second unidirectional rotating shaft of declutching is to the side of described the second iron core end on projection direction, and away from described the first iron core near described the second iron core.

Preferably, described the first unidirectional rotating shaft horizontal section that declutches is polygonal, described the first unidirectional axle that declutches comprises and the first fitting surface of described the first iron core cooperation and first seamed edge relative with described the first fitting surface, described at least one first lug boss is two, described two the first lug bosses are two corner angle of the bi-side formation that described the first fitting surface is adjacent with its side direction, and described two corner angle lay respectively at the axis of described the first unidirectional rotating shaft of declutching to the both sides of described the first iron core projecting direction.

Preferably, the horizontal section of described the first unidirectional rotating shaft of declutching is acute triangle or isosceles triangle, any one side place face that described the first fitting surface is acute triangle or place, the base face of isosceles triangle.

Preferably, the axis of described the first unidirectional rotating shaft of declutching is less than or equal to described axis to the distance between described the second iron core to the distance of described the first seamed edge.

Preferably, described the second unidirectional rotating shaft of declutching is identical with the structure of described the first unidirectional rotating shaft of declutching, and described the second unidirectional rotating shaft of declutching comprises second fitting surface contiguous with described the second iron core, and described the first fitting surface and the opposing setting of described the second fitting surface.

Preferably, described the first unidirectional rotating shaft of declutching, second unidirectional declutch rotating shaft along described in declutch being laterally arranged side by side of groove.

Preferably, the axis of the axis of described the first unidirectional rotating shaft of declutching and described the second unidirectional rotating shaft of declutching is parallel to each other, and the plane at the two axial lines place end face relative with the second iron core two with described the first iron core parallels.

Preferably, described the first unidirectional declutch rotating shaft and the second unidirectional rotating shaft of declutching is eccentric structure.

The utility model also provides a kind of elevator drum brake, comprises brake-releasing gear,

This break also comprises rotating the first brake arm that is arranged on the Brake drum two opposite sides that are braked and the second brake arm, the first resetting means being connected with described the first brake arm and the second resetting means being connected with described the second brake arm;

Described the first brake arm is connected with described the first iron core, described the first iron core is when described primary importance, described the first brake arm presses and coordinates with described Brake drum, described the first iron core is when the described second place, described the first brake arm is separated with described Brake drum, and described the first resetting means applies the active force towards described primary importance to described the first brake arm;

Described the second brake arm is connected with described the second iron core, described the second iron core is when described the 3rd position, described the second brake arm presses and coordinates with described Brake drum, described the second iron core is when described the 4th position, described the second brake arm is separated with described Brake drum, and described the second resetting means applies the active force towards described the 3rd position to described the second brake arm.

Implement elevator drum brake of the present utility model and brake-releasing gear thereof, there is following beneficial effect: implement the utility model, can make the first iron core and the second iron core outwards mobile separately respectively, and then the braking device that makes brake hub both sides brake sticking brake separately, respectively the stopping power of the brake unit of both sides is detected separately, to improve the Security of detected elevator, prevent that one group of brake unit lost efficacy and the problem that can't find has been eliminated potential safety hazard.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing:

Fig. 1 is the structural representation of the utility model elevator drum brake;

Fig. 2 be the first iron core of brake-releasing gear in Fig. 1 at primary importance, the second iron core the E-E generalized section during in the 3rd position;

Fig. 3 be the first iron core of brake-releasing gear in Fig. 1 at the second place, the second iron core the F-F generalized section during in the 4th position;

Fig. 4 enlarged view during in the 3rd position that is the first iron core in Fig. 2 at primary importance, the second iron core;

Fig. 5 enlarged view during in the 4th position that is the first iron core in Fig. 3 at the second place, the second iron core;

Fig. 6 is the F-F generalized section in Fig. 1;

Fig. 7 is the structural representation of the elevator drum brake in background technique;

Fig. 8 is the first iron core, the local enlarged diagram of the E '-E ' section of the second iron core when closing position in Fig. 7;

Fig. 9 is the first iron core, the local enlarged diagram of the E '-E ' section of the second iron core when opening a sluice gate position in Fig. 7;

Figure 10 is the F '-F ' generalized section in Fig. 7.

Embodiment

For technical characteristics of the present utility model, object and effect being had more clearly, understand, now contrast accompanying drawing and describe embodiment of the present utility model in detail.

As shown in Figure 1, elevator drum brake in embodiment of the present utility model comprises brake-releasing gear 10, the first brake unit 30 that is arranged on rotationally Brake drum 20 two opposite sides that are braked and the second brake unit 40, the two ends of brake-releasing gear 10 are connected with the first brake unit 30, the second brake unit 40 respectively, to drive the first brake unit 30, the second brake unit 40 separated with Brake drum 20.

As shown in Figures 2 and 3, brake-releasing gear 10 comprise housing 11, can between primary importance A and second place B, move around be arranged on the first iron core 12 in housing 11, solderless wrapped connection at first coil 13 in the first iron core 12 outsides, can between the 3rd position C and the 4th position D, move around is arranged on the second iron core 14 in housing 11, solderless wrapped connection at second coil 15 in the second iron core 14 outsides.The first iron core 12 and the second iron core 14 opposing settings in interval, and between the first iron core 12 and the second iron core 14, form the groove 16 that declutches.

The first iron core 12 is connected with the first brake unit 30, the first iron core 12 is when primary importance A, the first brake unit 30 presses and coordinates with Brake drum 20, and when being moved to second place B by primary importance A, the first iron core 12 drives the first brake unit 30 separated with Brake drum 20.The second iron core 14 is connected with the second brake unit 40, the second iron core 14 is when the 3rd puts, the second brake unit 40 presses and coordinates with Brake drum 20, and when being moved to the 4th position D by the 3rd position C, the second iron core 14 drives the second brake unit 40 separated with Brake drum 20.The first coil 13 and the second coil 15 are the in the situation that of its energising, to allow respectively the first iron core 12 and the second iron core 14 produce the magnetic force repelling each other, allow the first iron core 12 move to second place B, the second iron core 14 moves to the 4th position D, reaches the object that the first brake unit 30 and the second brake unit 40 declutch simultaneously.

As shown in Figures 4 to 6, in certain embodiments, this brake-releasing gear 10 also comprises the first unidirectional declutch rotating shaft 17 and the second unidirectional rotating shaft 18 of declutching being arranged on rotationally in the groove 16 that declutches, and the first spanner 171 and the second spanner 181 that vertically insert respectively the lock-joint at housing 11 tops.The first spanner 171 is fixedly connected with the first unidirectional rotating shaft 17 of declutching, and the second spanner 181 is fixedly connected with the second unidirectional rotating shaft 18 of declutching, and drives respectively unidirectional rotating shaft 18 axial rotation that declutch of the first unidirectional rotating shaft 17, second of declutching.

In certain embodiments, the unidirectional rotating shaft 18 of declutching of the first unidirectional rotating shaft 17, second of declutching can be eccentric structure, and the first unidirectional rotating shaft 17 of declutching coordinates with the first iron core 12, and the second unidirectional rotating shaft 18 of declutching coordinates with the second iron core 14.When the first unidirectional rotating shaft 17 of declutching is rotated, its eccentric position drives the first iron core 12 to be moved to the second place B away from the second iron core 14 by primary importance A; When the second unidirectional rotating shaft 18 of declutching is rotated, its eccentric position drives the second iron core 14 to be moved to the 4th position D away from the first iron core 12 by the 3rd position C, realizes the manually unidirectional object declutching.

In certain embodiments, the first unidirectional horizontal section that declutches rotating shaft 17 can be polygonal, the first unidirectional rotating shaft 17 of declutching comprises and the first fitting surface 172 of the first iron core 12 cooperations and first seamed edge 173 relative with the first fitting surface 172, it is the corner angle of the first unidirectional rotating shaft 17 of declutching that the first fitting surface 172 bi-side adjacent with its side direction form respectively two the first lug boss 174, the first lug bosses 174.

As shown in Figure 4, preferably, the transverse cross-sectional shape of the first unidirectional rotating shaft 17 of declutching is acute triangle or isosceles triangle, the first fitting surface 172 is the arbitrary limit of acute triangle place face or is place, the base face of isosceles triangle, so that two the first lug bosses 174 both sides to the first iron core 12 end on projection directions at the axis of the first unidirectional rotating shaft 17 of declutching respectively.

The axis of the first unidirectional rotating shaft 17 of declutching is less than or equal to described axis to the distance between the second iron core 14 to the distance of the first seamed edge 173, prevent in the first unidirectional rotating shaft 17 of declutching during along axis left-right rotation, the second iron core 14 produces movement owing to being subject to the active force that the first seamed edge 173 applies.Two first lug bosses 174 make the first unidirectional declutching during rotating shaft 17 left-right rotation apply respectively active force to the first iron core 12, and the first iron core 12 is moved to second place B fast by primary importance A.

The structure of the second unidirectional rotating shaft 18 of declutching is identical with the structure of the first unidirectional rotating shaft 17 of declutching, it comprises that two the second lug boss 184, the second lug bosses 184 that the second fitting surface 182, second seamed edge 183 relative with the second fitting surface 182 and the first fitting surface 172 bi-side adjacent with its side direction form are respectively also the corner angle of the second unidirectional rotating shaft 18 of declutching.The second fitting surface 182 and the opposing setting of the first fitting surface 172, and the first unidirectional declutch rotating shaft 17 and the second unidirectional rotating shaft 18 of declutching be arranged side by side along the groove 16 that declutches, and the second fitting surface 182 coordinates with the second iron core 14, and the second seamed edge 183 coordinates with the first iron core 12.

Same, the axis of the second unidirectional rotating shaft 18 of declutching is less than or equal to described axis to the distance between described the first iron core 12 to the distance of described the second seamed edge 183, in the second unidirectional rotating shaft 18 of declutching during along axis left-right rotation, two second lug bosses 184 can apply active force to the second iron core 14 respectively, and the second iron core 14 is moved to the 4th position D fast by the 3rd position C.In the present embodiment, the axis of the first unidirectional rotating shaft 17 of declutching and described the second unidirectional axis that declutches rotating shaft 18 are parallel to each other, and 14 liang of relative end faces of the plane at two axial lines place and described the first iron core 12 and the second iron core parallel.Preferably, the axis of the first unidirectional rotating shaft 17 of declutching equals described axis to the distance between the second iron core 14 to the distance of the first seamed edge 173, and the axis of the second unidirectional rotating shaft 18 of declutching equals described axis to the distance between described the first iron core 12 to the distance of described the second seamed edge 183.

Again as shown in Figure 1, the first brake unit 30 comprises the first brake arm 31 arranging rotationally and is arranged on the first link 32, the first brake shoe 33, the first resetting means 34 on the first brake arm 31.One end of the first brake arm 31 is connected with the first iron core 12 by the first link 32, and the other end fixedly mounts rotationally.The first brake shoe 33 is arranged on side relative with Brake drum 20 on the first brake arm 31, when the first iron core 12 is during at primary importance A, by 33 pairs of Brake drums 20 of the first brake shoe, presses friction fit by Brake drum 20 stops.The first resetting means 34 comprise be connected to the second link 341 between the first brake arm 31 and housing 11 and be pressed on the first brake arm 31 outsides and the second link 341 outer ends between Compress Spring 342, the second link 341 is with first brake arm 31 is mobilizable coordinates, and Compress Spring 342 applies the active force towards primary importance A to the first brake arm 31.When the first unidirectional rotating shaft 17 of declutching is rotated, drive the first iron core 12 to be moved to second place B by primary importance A, pressure-driven the first brake arm 31 that the first iron core 12 overcomes Compress Spring 34 opens, make 33 pairs of Brake drums of the first brake shoe 20 keep brake off state, whether the second brake unit 40 can be braked Brake drum 20 separately, to check the braking effect of the second brake unit 40 qualified.

The second brake unit 40 comprises the second brake arm 41 arranging rotationally and is arranged on the 3rd link 42, the second brake shoe 43 and the second resetting means 44 on the second brake arm 41, each part is identical with each design of part of the first brake unit 30, the symmetrical opposite side that is arranged on Brake drum 20.The second brake arm 41 is connected with the second iron core 14, when the second iron core 14 is during at the 3rd position C, by 43 pairs of Brake drums 20 of the second brake shoe, presses friction by Brake drum 20 stops.The second resetting means 44 applies the active force towards the 3rd position C to the second brake arm 41.When the second unidirectional rotating shaft 18 of declutching is rotated, drive the second iron core to be moved to the 4th position D by the 3rd position C, pressure-driven the second brake arm 41 that the second iron core 14 overcomes Compress Spring 44 opens, make 43 pairs of Brake drums of the second brake shoe 20 keep brake off state, whether the first brake unit 30 can be braked Brake drum 20 separately, to check the braking effect of the first brake unit 30 qualified.

Understandable, above-mentioned each technical characteristics can combination in any be used and unrestricted.

The foregoing is only embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model specification and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.

Claims (10)

1. an elevator drum brake brake-releasing gear, comprise first iron core (12) that can move around and install between primary importance (A) and the second place (B), the first coil (13) matching with described the first iron core (12), the second iron core (14) of installing and the second coil (15) matching with described the second iron core (14) can move around between the 3rd position (C) and the 4th position (D), described the first iron core (12), the opposing setting in the second iron core (14) interval, and described the first iron core (12), between the second iron core (14), be formed with the groove that declutches (16), it is characterized in that,

This elevator drum brake brake-releasing gear also comprises the first unidirectional rotating shaft of declutching (17) and the second unidirectional rotating shaft of declutching (18) in the groove (16) that declutches described in being arranged on rotationally respectively,

Described the first unidirectional rotating shaft of declutching (17) coordinates with described the first iron core (12), to drive described the first iron core (12) mobile to the second place (B) away from described the second iron core (14) by described primary importance (A); Described the second unidirectional rotating shaft of declutching (18) coordinates with described the second iron core (14), to drive described the second iron core (14) mobile to the 4th position (D) away from described the first iron core (12) by described the 3rd position (C).

2. elevator drum brake brake-releasing gear according to claim 1, it is characterized in that, described the first unidirectional rotating shaft of declutching (17) side is provided with at least one first lug boss (174), described at least one first lug boss (174) is located at the axis of described the first unidirectional rotating shaft of declutching (17) to the side of described the first iron core (12) end on projection direction, and away from close described the first iron core (12) of described the second iron core (14);

Described the second unidirectional rotating shaft of declutching (18) week is upwards provided with at least one second lug boss (184), described at least one second lug boss (184) is located at the axis of described the second unidirectional rotating shaft of declutching (18) to the side of described the second iron core (14) end on projection direction, and away from close described the second iron core (14) of described the first iron core (12).

3. elevator drum brake brake-releasing gear according to claim 2, it is characterized in that, described the first unidirectional rotating shaft of declutching (17) horizontal section is polygonal, described the first unidirectional axle that declutches comprises and first fitting surface (172) of described the first iron core (12) cooperation and first seamed edge (173) relative with described the first fitting surface (172), described at least one first lug boss (174) is two, described two the first lug bosses (174) are two corner angle of the bi-side formation that described the first fitting surface (172) is adjacent with its side direction, described two corner angle lay respectively at the axis of described the first unidirectional rotating shaft of declutching (17) to the both sides of described the first iron core (12) projecting direction.

4. elevator drum brake brake-releasing gear according to claim 3, it is characterized in that, the horizontal section of described the first unidirectional rotating shaft of declutching (17) is acute triangle or isosceles triangle, any one side place face that described the first fitting surface (172) is acute triangle or place, the base face of isosceles triangle.

5. elevator drum brake brake-releasing gear according to claim 4, it is characterized in that, the axis of described the first unidirectional rotating shaft of declutching (17) is less than or equal to described axis to the distance between described the second iron core (14) to the distance of described the first seamed edge (173).

6. elevator drum brake brake-releasing gear according to claim 5, it is characterized in that, described the second unidirectional rotating shaft of declutching (18) is identical with the structure of described the first unidirectional rotating shaft of declutching (17), described the second unidirectional rotating shaft of declutching (18) comprises second fitting surface (182) contiguous with described the second iron core (14), and described the first fitting surface (172) and the opposing setting of described the second fitting surface (182).

7. elevator drum brake brake-releasing gear according to claim 6, is characterized in that, described the first unidirectional rotating shaft of declutching (17), the second unidirectional rotating shaft of declutching (18) along described in declutch being laterally arranged side by side of groove (16).

8. elevator drum brake brake-releasing gear according to claim 7, it is characterized in that, the axis of the axis of described the first unidirectional rotating shaft of declutching (17) and described the second unidirectional rotating shaft of declutching (18) is parallel to each other, and the plane at the two axial lines place end face relative with the second iron core (14) two with described the first iron core (12) parallels.

9. elevator drum brake brake-releasing gear according to claim 1, is characterized in that, described the first unidirectional rotating shaft of declutching (17) and the second unidirectional rotating shaft of declutching (18) are eccentric structure.

10. an elevator drum brake, is characterized in that, comprises the elevator drum brake brake-releasing gear described in claim 1 to 9 any one,

This break also comprises rotating the first brake arm (31) that is arranged on Brake drum (20) two opposite sides that are braked and the second brake arm (41), the first resetting means (34) being connected with described the first brake arm (31) and the second resetting means (44) being connected with described the second brake arm (41);

Described the first brake arm (31) is connected with described the first iron core (12), described the first iron core (12) is when described primary importance (A), described the first brake arm (31) presses and coordinates with described Brake drum (20), described the first iron core (12) is when the described second place (B), described the first brake arm (31) is separated with described Brake drum (20), and described the first resetting means (34) applies the active force towards described primary importance (A) to described the first brake arm (31);

Described the second brake arm (41) is connected with described the second iron core (14), described the second iron core (14) is when described the 3rd position (C), described the second brake arm (41) presses and coordinates with described Brake drum (20), described the second iron core (14) is when described the 4th position (D), described the second brake arm (41) is separated with described Brake drum (20), and described the second resetting means (44) applies the active force towards described the 3rd position (C) to described the second brake arm (41).

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