CN1011217B - Emergency braking control device for elevator - Google Patents

Abstract

The present invention relates to an emergency brake control device for elevators, which is characterized in that when an elevator generates any abnormal condition, a frictional brake device is driven to brake and stop the running of an elevator chamber; from the angle of the rotating shaft of the driving motor of the elevator, the load of the elevator is detected; when the elevator is braked urgently and the load of the elevator is very large, the braking force rubbing the brake device is reduced to ensure safety under the condition that the moment of inertia of the elevator is reduced.

Description

Emergency braking control device for elevator

The present invention relates to a kind of emergency braking control device for elevator, a kind of emergency stop mechanism that reduces elevator system inertia that is applicable to of more specifically saying so.

In general, the structure of the mechanical system of an elevator system as shown in Figure 1, reducing gear 2 and sheave 3 link with drive motor 1, and clump weight 5 and lifting cabin 6 are hanging by the rope 4 on sheave 3, in order to brake lifting cabin 6 and it to be stopped, be provided with a friction stopping device 7, it is made up of a restraining coil 7C, a brake block 7S and a brake drum 7D usually.Replacing the mode of parts 7S and 7D with disc type brake also is called optical imaging.

In such structure; in the process that cabin 6 turns round under the driving of motor 1; in when, in the elevator abnormal condition taking place; the propulsive effort of motor 1 is cut off, and start brake equipment 7, so that lifting cabin sudden stop; promptly; as described in example, when controlling apparatus for lifts door takes place when unusual, friction stopping device 7 also can be used as the fender guard of cabin 6 emergencies.

Therefore, in an elevator, the system that it adopted is in normal ramp to stop operation, braking force by control friction stopping device 7, produce a lock torque, so that alleviate the impact that puts in place, and when abnormal condition, friction stopping device 7 is unconditionally started, thereby has preferentially guaranteed safety.

As everyone knows, when the moment of inertia of mechanical system shown in Figure 1 diminished, the charge capacity of motor 1 and power consumption can reduce.

Therefore, people consider by keeping a less moment of inertia to save electric energy recently.

Yet, it is found that, when inertia reduced, following point had appearred again.As previously mentioned, when the abnormal condition of elevator, must pass through at first starting friction brake equipment 7, guarantee safety.Yet when moment of inertia hour, cabin 6 can stop suddenly.In this case, slow down when very big, the passenger will be subjected to the impact of a very big danger close.Therefore, people consider to weaken the braking force of friction stopping device 7.Yet in this case, deceleration distance is all elongated.Therefore full load when the elevator band and take place in descending when unusual, when perhaps rising with seldom passenger, elevator can not stop at the end layer, and the impact up or down of generation, may cause serious accident.In addition, when the passenger on the elevator surpasses a fixed load, require friction stopping device 7 to have at least enough braking force to make cabin 6 keep motionless, this point has limited weakening of friction brake force.

Therefore, it is restricted reducing moment of inertia one value.

Main purpose of the present invention provides the emergency braking control device of an elevator, and it makes elevator when abnormal condition, when guaranteeing safety, can reduce moment of inertia.

In device, when the lifter abnormal situation took place, the starting friction brake equipment made the elevator sudden stop.Principal character of the present invention is: the load to elevator detects, and this load is the value that the rotating shaft from the elevator drives motor obtains, and the braking force of friction stopping device is controlled in the load of elevator during according to sudden stop.

Other purposes and feature will be described in detail in the following explanation of embodiment.

Fig. 1 is the basic block diagram of common elevator mechanical system;

Fig. 2 has illustrated a kind of method of definite elevator frictional power square;

Fig. 3,4 and 5 is instruction diagrams, and a kind of method of friction braking moment is determined in each figure explanation according to the present invention.

Fig. 6 and Fig. 7 (a) 7(b) be instruction diagram according to friction braking moment characteristic of the present invention;

Fig. 8 is an embodiment figure according to emergency braking control device for elevator of the present invention;

Fig. 9 is the decision circuit figure of embodiment among Fig. 8;

Figure 10 is the time diagram of the motion process of instruction diagram 8 and Fig. 9;

Figure 11 is the embodiment figure according to a kind of load detector of the present invention;

Figure 12 is another embodiment figure of emergency braking control device for elevator of the present invention.

At this, the relation between a kind of braking force of friction stopping device (hereinafter to be referred as braking force) and the moment of inertia will at first be illustrated.

Relation when load factor when Fig. 2 represents lifting cabin rising operation and running under braking between the deceleration/decel α of lifting cabin.

Deceleration/decel α during running under braking is calculated by following formula

$\mathrm{a\; =\; K\; ·}\frac{T_B{\mathrm{+\; T}}_{\mathrm{LX}}}{J}{\mathrm{(m/a}}^2\mathrm{)\; \dots \dots (1)}$

Wherein

COEFFICIENT K is by the reduction ratio of reducing gear and the diameter of sheave (m) decision,

T _BBe lock torque (Nm),

T _LXBe load moment (Nm)

T _LX＝K（W _LX-W _c）（N·m）

W _LXBe the load factor (Kgf) of lifting cabin,

J is the moment of inertia of elevator system.

As previously mentioned, provided and when running under braking, make the passenger avoid the higher limit α of injured deceleration/decel _ULWith the lower limit α of the deceleration/decel of collision up and down that prevents the at both ends layer _DLTherefore, the deceleration/decel of lifting cabin need satisfy formula α _UL≤ α≤α _DLNo matter how are load factor in the storehouse and service direction.When last lift operations, deceleration/decel need be used L in the drawings according to what obtained by equation (1) ₁The characteristic curve of expression is determined.

Characteristic curve L ₁Slope K ₁With the lower limit α that gets in touch deceleration/decel _DLWith upper limit α _ULCharacteristic curve L ₀Slope K ₀Following relation is arranged:

K ₁≤K ₀

And then, at unloaded N _LThe time, characteristic curve L ₁Deceleration/decel α _N1Satisfy

α _N1≥α _DL

Wherein, K and α _N1Obtain by following formula:

$K_1=\frac{{\mathrm{2\; ·K\; ·T}}_{\mathrm{LF}}}{{\mathrm{J\; ·W}}_{\mathrm{LF}}}\mathrm{\dots \dots (2)}$

T _LFBe the overbalance torque (Nm) of at full load,

T _LOOverbalance torque (Nm) when being zero load,

W _LFIt is the unbalance load (Kg) of at full load.

Like this, must determine moment of inertia J, determine lock torque T with equation (3) with equation (2) _B

The moment of inertia J that calculates from above-mentioned relation becomes very big usually, the big 3-6 of rectilinear system moment of inertia that this moment of inertia calculates than the weight from cabin and clump weight doubly need impose on rotary system on the machine shaft with this moment of inertia by for example increasing brake drum etc. when surpassing kinetic energy.

Consequently, the moment that is used to drive elevator becomes very big, and the energy of electrical consumption also will increase naturally.

To explain basic conception of the present invention below.

Load factor when Fig. 3 illustrates the rising operation and the relation between the deceleration/decel, similar to Fig. 2.

At first set forth a kind of situation, wherein to J ₂, it is minimum that rotor inertia can reduce to functionally, J ₂To aforesaid characteristic curve L ₀Following relation is arranged:

$\frac{J_O}{J_2}{\mathrm{=\; K}}_J\mathrm{\le \; 2}$

Suppose at characteristic curve L ₀Required lock torque T under the situation _BoBe a constant, the characteristic curve L among the figure ₂At non-loaded N _LThe time, deceleration/decel is α _N2=K _Jα _DLAnd have a gradient:

K ₂＝K _J·K _o

Characteristic curve L among the figure ₂Be at above-mentioned rotor inertia J ₂Situation get off to set up.This characteristic curve has surpassed higher extreme value α basically in whole interval _UL

Therefore, lock torque need weaken, so that deceleration/decel can equal smallest limit α at least _DL

This moment lock torque T _B3Become:

${\mathrm{<figure-callout\; id="3"\; label="T\; B"\; filenames="85103125\_DRIMG3.png"\; state="\{\{state\}\}">T</figure-callout>}}_B=\frac{a_{\mathrm{<figure-callout\; id="3"\; label="M"\; filenames="85103125\_DRIMG3.png"\; state="\{\{state\}\}">M</figure-callout>\; 3}}{\mathrm{·J}}_2}{K}{\mathrm{+\; T}}_{\mathrm{LO}}$

α wherein _N3〉=α _DL

One produces lock torque T _B3Characteristic curve such as figure in L ₃Shown in.Here only by the weak lock torque of alkali, characteristic curve L ₃Just has characteristic curve L ₂Same slope, the part of 1. being represented by oblique line surpasses higher extreme value α in the drawings _UL

Thus, by further weakening lock torque, at the load H of a balance _LUnder the situation, deceleration value α _H4Be determined so that be equal to or greater than low extreme value α _DLPerhaps at full and down F _LUnder the situation, a brake value α _F4Be determined so that be equal to or less than limes superiors α _ULUse T _B4As long as expression lock torque in this case is α _H4〉=α _DLThen following formula is set up:

$T_{\mathrm{B4}}=\frac{a_{\mathrm{H\; 4}}{\mathrm{·J}}_2}{K}$

(T here _B3＞T _B4)

Or this situation, the part of 2. being represented by oblique line among the figure becomes naturally less than low extreme value α _DL

Therefore, at the rising run duration, lock torque is for from no-load point N _LTo balanced load H _LRegional internal conversion be T _B3(characteristic curve L ₃) and for equaling and surpassing balanced load H _LThe zone be converted to T _B4, can obtain a characteristic curve L who in Fig. 4, represents thus by solid line _UpIn service in decline, with balanced load H _LAs boundary, load moment is opposite when moving with rising, the characteristic curve L when rising operation like this ₃And L ₄Become characteristic curve L with respect to the balanced load symmetry ₃' and L ₄', as shown in Figure 4.Correspondingly, lock torque is for from no-load point N _LTo balanced load H _LThe interval be transformed into T _B4And for equaling or exceeding balanced load H _LThe interval be transformed into T _B3, obtain the characteristic curve L shown in the dotted line among the figure thus _DN

Also obey K according to the above _J≤ 2, deceleration/decel α can be by obeying formula at two or more phase transition lock torques

α _DL≤α≤α _UL

Below will be noted that relational expression J ₀/ J ₂=K _J＞2 a kind of situations of setting up.

In this case, be similar to K _J≤ 2 situation, the slope ratio characteristic curve L that characteristic curve had _oSlope K _oBig K _JDoubly.For 2＜K _J≤ 3, lock torque is divided into the three or more stages and for 3＜K _J≤ 4 are four or multistage more, and are to change according to load factor.So, can be created in upper limit α _ULWith lower limit α _DLBetween deceleration/decel.

As an example, at K _JRelation under=3 the situation is by shown in Figure 5.

At T _B01, T _B02And T _B03Lock torque is set respectively, thereby has set up graphic characteristic curve L ₀₁, L ₀₂And L ₀₃, they can be changed according to load state.

The purpose of braking is not only that moving elevator is stopped, and its cabin can also be remained on the fixed position.Usually, cabin is remained on the needed moment in fixed position should have such value at least, promptly the cabin that is loading the 180-200% of elevator rated load, nominal load can be remained on the fixed position fully.

If T _BSBe fixing hold torque (or claiming static hold torque), when the lock torque maxim that is provided with by foregoing mode less than T _BSThe time, for example when the maximum of T that is provided with _B2Be T _BS＜T _B2The time, lock torque just further forms, thereby can produce static hold torque T _BS

In a word, when the slope at low inertia be K _JMultiply by slope K _oThe time (this K _oValue is by deceleration upper limit α _ULWith deceleration lower limit α _DLCalculate), lock torque is set as a value at least, and this value is passed through in slope K _JInteger partly add " 1 " and obtain.And then when the maxim of the moment values that is provided with was fixed required moment less than the maintenance elevator, lock torque was configured to also comprise hold torque.

Below method has by way of example been explained principle of the present invention, and purpose is to be convenient to understand, with reference to the load factor in the cabin and with the relation of counterweight weight to load moment T _LXThe definite value process.Yet above method is not restrictive, and the method that load moment acts on the load moment on the S. A. in the time of also can be by the operation of direct detection electrical motor or detects motor current value obtains.According to the load moment of above detection, lock torque can obtain good control.

That is to say that main points of the present invention are that according to the load control brake moment on the motor rotation axis, promptly according to the load control brake moment of elevator, the present invention not method of examined load limits.

Narrate one embodiment of the present of invention in the situation of execution moment shown in Figure 4 conversion now.

Fig. 6 has explained the value (two-stage conversion) of the required lock torque of the structure of Fig. 4.In the drawings, moment T ₂, T ₁And T ₀Following relation is arranged:

T ₂＞T ₁＞T ₀＝0

T ₂Corresponding to T illustrated in fig. 4 _B3, T1 is corresponding to T _B4Lock torque T _o(=0) is corresponding to the operation of elevator.

Moment T under abnormal condition ₁And T ₂Relation shown in Fig. 7 (a) and Fig. 7 (b).As can be seen from Figure 4, rising operating period, at least at balanced load H _LUnder the situation, or between decrement phase, at the most at balanced load H _LUnder the situation, should add moment T ₁; Rising operating period, at the most at balanced load H _LFollowing, or during step-down operation, at least at balanced load H _LNeed the real moment T that adds down, ₂

Fig. 8 has represented the brake control circuit of control torque.Usually, brake request has a retarding spring, and spring force is used for being provided with maximum braking force.At this moment, moment values determines that by electric current this electric current flows through braking magnet coil 7C.Say that more properly when the electric current that flows through coil 7C was very big, the moment of offsetting retarding spring power just produced.

Brake control circuit 8 is made of following part: source of AC AC, be used for changing the rectifier 81 of alternating current, and suppress the resistance 82-84 that electric current flows through coil 7C, contact R ₁₀₁And R ₂₀₁, they are contacts of the relay that will narrate of back.

According to above circuit, work as contact R ₂₀₁When opening, circuit disconnects, consequently the moment T that produces owing to retarding spring power ₂In contact R ₂₀₁Be under the closed condition, when resistance 82 by contact R ₁₀₁During short circuit, lock torque is T _o=0, when resistance 82 inserts, produce moment T ₁The switch of contact is by decision circuit 9 controls, this circuit is accepted from abnormal detector E, rotation direction detecting device DE, Weight detector WD(such as this device according to the load sensor 60 that is installed in the elevator underfloor, determine load factor) and the signal of zero velocity detecting device VD, zero velocity detecting device VD is used for detecting zero velocity according to the signal from speed detector 10.

Now, with reference to the relay sequence shown in Fig. 9, the work of determining circuit 9 is described.

In Fig. 9, R ₁₀Be illustrated in the normal running from starting to the relay that stops all to be in connection; R _10TRepresent relative relay R ₁₀A period of time t lags behind _DAnd open circuited relay, R ₂₀The relay of lock torque is adjusted in expression; And when abnormal detector E detected abnormal condition, the RE relay just disconnected.RE ₁The open contact of expression relay R E; In Fig. 8, R ₁₀₂, R ₁₀₃With symbol R ₁₀₁The expression relay R ₁₀Open contact; R ₁₀T ₁The normal opened contact of expression time relay R10T; Symbol R20 among Fig. 8 ₁The normal opened contact of expression relay R 20.RP ₁Be illustrated in the normal opened contact of the open circuited relay in elevator cutoff altitude position; RHF1 is the normal opened contact of a relay, and when the output of Weight detector WD was not less than balanced load, this relay was connected; RNH ₁Be the normal opened contact of a relay, when the output of installing WD is not more than balanced load H _LThe time, this relay is connected; RUP ₁Be the normal opened contact of a relay, when rotation direction detected dress value DE indication rising or rises operation, this relay was connected; RDN ₁Be the normal opened contact of a relay, when zero velocity detecting device VD indication speed was zero substantially, this relay disconnected.

Figure 10 represents the sequential chart of above-mentioned embodiment, and wherein solid line is corresponding to normal circumstances, and dotted line is corresponding to abnormal condition.

The situation of normal running at first, is described.In Fig. 9, suppose that owing to abnormal operation, abnormality detection relay R E connects, along with its contact RE ₁Close, by a position signal, cutoff altitude detects relay tip RP ₁Also close.Therefore, when starting, operation start button SB, relay R ₁₀, R _10TAnd R ₂₀All enter connection (on) state, and these states are all by contact R 10 ₂Keep.

Like this, in the brake control circuit 8 of Fig. 8, contact R10 ₁And R20 ₁Close, so that braking is removed, electrical motor 1 is started working, thereby elevator 6 is brought into operation.When arriving the parking tier position, cutoff altitude detects relay tip RP ₁Open, and because speed is zero substantially, by the output of zero velocity detecting device VD, zero velocity detects relay tip RV ₁Be opened.Therefore, because contact RP ₁With contact RV ₁Action, relay R ₁₀With relay R 20 ₁Be disconnected.Electric current is cut off by the contact R201 in Fig. 8 braking circuit, and the maximum flexibility moment T of braking is provided ₂

Shown in (A ') among Figure 10, in course of normal operation, t ₀The lock torque in (the initial moment) is T constantly _o(=0), t ₃The lock torque that (stops constantly) is T constantly ₂(maximum flexibility value).

Secondly, the sudden stop when strange phenomena occurring will be described.Let us is considered such a case, promptly at the time of elevator run duration t ₁(as shown in figure 10) abnormal condition have taken place.When abnormal condition took place, abnormal detector E detected relay R E according to sequential working shown in Figure 9 to turn-off it.Relay R 10 is by contact R E ₁Disconnect and time relay R10 _TPostponing time gap t _DTurn-off the back.At this moment, lock torque is adjusted relay R 20 shown in the figure

Between passage situation about opening under, by contact R 10 ₃Turn-off.Yet as under the normal operation situation, the braking circuit 8 shown in Fig. 8 is by contact R 20 ₁Cut off, and provide the maximum lock torque T that is provided with ₂, as in figure T10 shown in (B ') like that.

Between the open-circuit condition of passage have when rising operation and be no more than balanced load HL at the most or have balanced load HL at least during corresponding to decline work.In this case, same, when the emergency situation of deceleration regime, the lifting cabin can be stopped.Deceleration regime is by the characteristic curve L among Fig. 4 ₃Solid line partial sum characteristic curve L ' ₃Dotted portion represented, that is to say that deceleration regime α is in α _UL＞α＞α _ULScope in.

Then, as shown in Figure 9, Between the pent situation of passage under, even when contact R 10 ₃Disconnect.Adjusting relay R 20 is to be in " conducting " state, because from contact R 10T ₁To contact R V ₁Arrive

This road is to be in closed condition.At this moment, relay R 10 is to be in " disconnection " as previously mentioned, equally in braking circuit 8, and contact R 20 ₁Closure and contact R 10 ₁Disconnect.Can make resistance 82 access circuits like this.In other words, applied a numerical value T ₁Lock torque.Therefore, time relay R10T is at time gap t _DThe gap disconnected or because the applying of lock torque, during the speed vanishing, the contact R 10T of time relay R10T ₁Or be used for the contact R V that speed detects ₁Disconnect, so time relay R20 disconnects shown in (C) among Figure 10.Thereby braking circuit is by the contact R 20 of relay R 20 ₁Cut off so that maximum set value T ₂Be added on the lock torque.Therefore, under this condition, the lock torque situation is shown in Figure 10 (C ').

Between passage be that the close circuit state is corresponding to having balanced load HL(contact R HF at least ₁Closure) rising work (contact R UP ₁Closed), perhaps corresponding to being no more than balanced load HL(contact R NH at the most ₁Closure) decline work (contact R DH ₁Closed).The lifting cabin stops when the deceleration/decel state.Deceleration regime be by the solid line of characteristic curve L4 partly and the dotted line of characteristic curve L ' 4 part represented and be presented among Fig. 4.

Because above-mentioned this structure, even when inertia is low, the vibration that stops during sudden stop can be slowed down.On the contrary, inertia can further be lowered.

Simultaneously, for safety, elevator has the forced deceleration switch, and the cutoff altitude of this switch in next level and bottom building is used to provide brake when being exceeded, and when elevator still in when operation, limit switch FLS work is to prevent bump up or down eventually.For example, limit the contact FLS of switch FLS eventually ₁Be connected to a power lead (as shown in Figure 9) so that the maximum torque of setting is added in the work of switch FLS, can guarantee safety in advance thus.

When load sensor 60 misoperations, for example,, still can think load factor still for being balanced load at least although there is not load, therefore, allow rising work to proceed, lock torque is littler than needed numerical value.

In order to reach the purpose that prevents this shortcoming, the most handy interlock circuit or similarly circuit a high reliability is provided, do also to can be obtaining two fault secure structures and set up a load detection part shown in Figure 11 like this.

Figure 11 has expressed an embodiment who constitutes the fault secure Weight detector, and this device makes one and the cooresponding frequency of load detected with a kind of method, and with it as a load signal.

Reference diagram, 61 for the floor surface of lifting cabin 6,62 is the shell of cabin 6, and 63 is the rubber spring plate, a spring or elastic-like material, this elastomeric material is inserted between floor surface 61 and the shell 62, and be restricted according to load, 64 for connecting dish, and it is installed on the floor surface 61, and move according to load, and two hole H that are in diverse location are arranged ₁And H ₂65 is one to connect dish, and it is installed on the shell 62, and is supporting two LED Ps ₁And P ₂, alphabetical P is a frequency generator, this producer is frequency f ₁And f ₂Pulse voltage be added to LED P respectively ₁And P ₂On.In addition, symbol PR represents a receptor, and it is respectively by connecting the hole H of dish 64 ₁And H ₂Detect LED P ₁And P ₂Signal, symbol fD is the frequency decision maker, it is used for judging the frequency signal frequency that receptor PR detects.

Here, hole H ₁Size make LED P ₁Signal just in time pass through and hole H to balanced load from non-loaded in load factor ₂Size make LED P ₂Signal when load factor is no less than balanced load, just in time pass through.LED P ₁The frequency f that generation produces by frequency generator ₁Signal, same LED P ₂Produce frequency f ₂Signal (f ₁≠ f ₂)

In said structure, frequency decision maker fD has a frequency bandwidth △ f, according to detection signal:

f ₁-△f＜f ₁＜f ₁+△f

It provides decision circuit 9 and indication load factor from non-loaded balanced loaded at the most signal in Fig. 8, and according to detection signal:

f ₂-△f＜f ₂＜f ₂+△f

It provides same circuit and the balanced loaded at least load factor of indication.Yet decision circuit 9 is as foregoing, according to these signal control lock torques.When the signal of frequency decision maker fD disappears because of the frequency of an exterior special range or as the damage of the light-emitting diode in the example, load signal contact R HN among Fig. 9 ₁And RHF ₁Disconnect.Equally, do not having under the situation such as service disruption event signal, the control setup operation makes contact R HN ₁And RHF ₁Disconnect, so that the control of the lock torque of present embodiment can be carried out fault secure ideally.

Mention above, in two-stage, show the situation of control brake moment.If the same more level that increases, this braking force can detect load factor according to multistage number and control according to front principle of the present invention.

Secondly, Figure 12 is another embodiment of braking circuit 8, referring to figure, with the difference of explanation with Fig. 8 structure.

Control circuit 8 is made up of a magnetic multi-vibrator 85, is used for according to a frequency incoming signal f ₈, voltage transformer 86 and direct supply of a rectifying circuit 87 controls.

Frequency signal f ₈Be the frequency instruction that lock torque shown in Figure 4 is provided from magnetic multi-vibrator 85, it is sent by the multiple control circuit 11 of magnetic according to the signal of decision circuit 9.

Like this, any fault is arranged or when the multiple control circuit 11 of magnetic continues to provide output or its to be output as zero, then do not have electric current to flow through restraining coil 7C, and lock torque becomes maxim when magnetic multi-vibrator 85.In other words, control setup can become fault-secure device.

Above, mentioned and explained embodiment, yet the present invention is not limited only to this.By way of example, vibration when exception parking can become stable by following mode, be that load factor is constantly by adopting differential converter etc. to detect as load sensor 60, with the signal circuit shown in the with dashed lines among Figure 12 of a differential calculation mechanism one-tenth, produce the frequency signal f of continuous control magnetic multi-vibrator simultaneously with this ₈In the executive routine of differential calculation machine, the illustrated frequency signal of load detection part provides a kind of more perfect fault secure structure among Figure 11 by adopting.In addition, in the foregoing description, elevator stops the back lock torque and is set at maxim, even lock torque can give better controlled so that the lifting cabin keeps stable in the process of shut-down operation according to load.In addition, be the brake drum type although provided friction stopping device, yet this install available disc type brake and make according to similar mode.

According to the present invention, be to set in the time of sudden stop friction brake force according to the load of elevator, so moment of inertia can further reduce, the parking by preventing a speed simultaneously or under abnormal condition up or down collision guarantee safety.Because the minimizing of moment of inertia, thereby, can reach the more expenditure of energy of saving of expection.

Claims (10)

1, emergency braking control device for elevator has the lifting cabin, is dragging in the elevator system of friction stopping device of the electrical motor of cabin and braking cabin operation, and when what abnormal condition elevator had, the starting friction brake equipment made the cabin sudden stop; It is characterized in that: comprising:

Detect the device of elevator charge capacity,

Detect the device of cabin operation exception,

Detect the cabin rotation direction device and

The gradual braking device of controlling above-mentioned friction stopping device comprises: detects the rotation direction of cabin cabin when unusual according to the size of cabin charge capacity with at above-mentioned abnormal condition detecting device, sets the device of the one-level in the multistage brake power,

Whereby, above-mentioned friction stopping device is by the starting of the one-level in the multistage brake of setting.

2, emergency braking control device for elevator as claimed in claim 1, wherein said gradual braking device reduces braking force along with the increase of elevator load.

3, emergency braking control device as claimed in claim 1, also comprise the device that detects cabin speed, above-mentioned gradual braking device is set the determined value that braking force is selected according to elevator charge capacity and cabin rotation direction when abnormal condition detecting device detects the cabin operation exception, detect cabin speed at speed detector and set the maxim that above-mentioned friction stopping device has when being lower than predetermined speed at least or when experiencing a schedule time after abnormal condition detecting device detects the cabin operation exception.

4, emergency braking control device for elevator as claimed in claim 1, wherein the elevator Weight detector detects the size of load according to the direction of cabin weight and elevator operation.

5, emergency braking control device for elevator as claimed in claim 1, wherein gradual braking device produces the maximum braking force that friction stopping device had in the schedule time after abnormal condition appear in elevator or cabin speed when dropping to predetermined speed.

6, emergency braking control device for elevator as claimed in claim 5, wherein above-mentioned friction stopping device is the electro-magnetic braking device that produces braking force according to institute's making alive, and above-mentioned gradual braking device cuts off the power supply of above-mentioned electro-magnetic braking device according to special situation.

7, emergency braking control device for elevator as claimed in claim 1 when elevator Weight detector and gradual braking device break down, produces the maximum braking force that above-mentioned friction stopping device has.

8, emergency braking control device for elevator as claimed in claim 7, wherein above-mentioned elevator Weight detector has output when normal operation, when Weight detector was not exported, above-mentioned gradual braking device produced the maximum braking force that above-mentioned friction stopping device has.

9, emergency braking control device for elevator as claimed in claim 7, wherein above-mentioned gradual braking device has output when normal operation, and when gradual braking device was not exported, above-mentioned friction stopping device was with maximum braking force work.

10, emergency braking control device for elevator as claimed in claim 9, wherein above-mentioned gradual braking device comprises a direct supply (D, C), a multi-vibrator, frequency requirement according to the elevator load, direct supply is transformed into source of AC, and a voltage transformer, its primary winding connects above-mentioned source of AC, and above-mentioned friction stopping device uses the output of above-mentioned transformer secondary output winding to produce braking force as power supply and according to the voltage that provides.

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