CN101224831A - Elevator brake control device - Google Patents

Elevator brake control device Download PDF

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Publication number
CN101224831A
CN101224831A CNA2007101621447A CN200710162144A CN101224831A CN 101224831 A CN101224831 A CN 101224831A CN A2007101621447 A CNA2007101621447 A CN A2007101621447A CN 200710162144 A CN200710162144 A CN 200710162144A CN 101224831 A CN101224831 A CN 101224831A
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brake
current
drg
time
unit
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CNA2007101621447A
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CN101224831B (en
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铃木靖孝
深田裕纪
高山直树
古桥昌也
佐藤康一
筱塚广树
松熊利治
岩本晃
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Hitachi Ltd
Hitachi Building Systems Co Ltd
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Hitachi Ltd
Hitachi Building Systems Co Ltd
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  • Elevator Control (AREA)
  • Braking Arrangements (AREA)
  • Maintenance And Inspection Apparatuses For Elevators (AREA)

Abstract

The invention provides an elevator brake control device capable of detecting the abnormity of the direct-current magnetic brake without special device and free from the effect of current staining during the brake operating and the act position of the brake detecting switch. The elevator brake control device comprises: at least above two direct-current magnetic brakes; a brake detecting switches mounted in each direct-current magnetic brake and used for detecting the switching state of the direct-current magnetic brake; a main control unit for commanding the switch of the direct-current magnetic brake; a current detecting unit for detecting the exciting current flowing through the brake coil of the direct-current magnetic brake; a storage cell for storing the normal current value detected by the current detecting unit and a diagnosis cell for diagnosing the state of the direct-current magnetic brake by comparing the normal current value with the abnormal current value.

Description

Control device for lift brake
Technical field
The present invention relates to a kind of control device for lift brake, in the dc electromagnetic brake of this control device for lift brake,, carry out the abnormality detection of dc electromagnetic brake according to the energizing circuit electric current of braking with electromagnet.
Background technology
As this kind device, in No. 2795152 patent of invention of Japan of patent documentation 1 a kind of device is disclosed for example, wherein, method for detecting abnormality as dc electromagnetic brake, the time dependent of the electric current when measuring the drg action continuously changes, and will begin to play the ascending velocity of the current value till movable core begins to move from energising and compare with just often ascending velocity, detect unusually with this.In addition, for example the patent of invention spy of Japan of patent documentation 2 opens in the flat 3-55342 communique and discloses a kind of device, the time that the decline of the exciting current when it detects the drg action takes place, and by should the time and predefined just often and the scope of the decline time of origin when unusual compare, detect unusual thus.
Patent documentation 1: No. 2795152 patent of invention of Japan
Patent documentation 2: Japanese kokai publication hei 3-55342 communique
In dc electromagnetic brake, when producing electromagnetic force when the energising of drg winding, brake pad begins to be braked bulging brake surface and attracts, and braking current begins to produce strain.For this reason, if when being arranged to use a current sensing means to detect the electric current that flows through a plurality of drg windings the apparatus structure, tangible decline may not can appear in the change point of electric current.In addition, in the gap when very little, because the slippage of the electric current when starting is very little, so also be difficult to detect.
In the electric current detecting method that existing continuous detecting electric current time dependent changes, for the electric current that can capture the short time of gap when very little changes, high precision and high-revolving current sensing means need be set, and, also need to adopt high-revolving method of inspection as detecting the method that descends.
In addition, if the operating position of brake verification switch be not arranged on the on all four position of the drop point of braking current on the time, because the operating position difference of the brake verification switch of each brake gear, even so under brake switch moves normal situation, electric current during the action of brake verification switch also difference can occur, thereby causes being used to judge whether unusual current value or the scope of time occurs different each drg.
Summary of the invention
The object of the present invention is to provide a kind of control device for lift brake, this control device for lift brake does not need to set up special device, just can be to the detecting unusually of dc electromagnetic brake, and the influence of the operating position of electric current strain can not be subjected to the drg action time and brake verification switch.
To achieve these goals, disclose a kind of control device for lift brake in technical scheme 1 of the present invention, it has: plural at least dc electromagnetic brake; The brake verification switch, it is separately positioned in each described dc electromagnetic brake, is used to detect the open and-shut mode of drg; Main control unit, it instructs described dc electromagnetic brake to open and close; Current detecting unit, its detection flow through the exciting current of the drg winding of described dc electromagnetic brake; And brake circuit, it makes exciting current flow through described drg winding by described main control unit, this control device for lift brake is characterised in that, further has memory cell, its storage is by the detected current value just often of described current detecting unit, and having a diagnosis unit, the current value of its current value just often during with described brake verification switch motion when unusual compares, to diagnose the state of described dc electromagnetic brake.
According to technical scheme 1, owing to adopted the detection mode of discreteness to detect the exciting current of drg winding, so there is no need exciting current is carried out continuous gauging, its result, can solve the very little problem that is difficult to detect of causing of above-mentioned electric current slippage when starting, and the above-mentioned problem that need carry out high speed detection to electric current.
In addition, disclose a kind of control device for lift brake in technical scheme 2 of the present invention, it has: plural at least dc electromagnetic brake; The brake verification switch, it is separately positioned in each described dc electromagnetic brake, is used to detect the open and-shut mode of drg; Main control unit, it instructs described dc electromagnetic brake to open and close; Current detecting unit, its detection flow through the exciting current of the drg winding of described dc electromagnetic brake; And brake circuit, it makes exciting current flow through described drg winding by described main control unit, this control device for lift brake is characterised in that, further have: time measuring unit, it is measured and to send drg from described main control unit and open and close instruction and play time till described brake verification switch begins to move; Time just often during described brake verification switch motion that memory cell, its storage measure by this time measuring unit; And diagnosis unit, time and described stored time just often during unusual during its described brake verification switch motion that will measure by described time measuring unit compare, to diagnose the state of described dc electromagnetic brake.
According to technical scheme 2, owing to can detect according to the time till beginning to move to the brake verification switch, so can detect unusually with simple structure.
And, a kind of control device for lift brake is disclosed in technical scheme 3 of the present invention, it has: plural at least dc electromagnetic brake; The brake verification switch, it is separately positioned in each described dc electromagnetic brake, is used to detect the open and-shut mode of drg; Main control unit, it instructs described dc electromagnetic brake to open and close; Current detecting unit, its detection flow through the exciting current of the drg winding of described dc electromagnetic brake; And brake circuit, it makes exciting current flow through described drg winding by described main control unit, this control device for lift brake is characterised in that, further have: time measuring unit, it is measured and to send drg from described main control unit and open and close instruction and play time till described brake verification switch begins to move; Memory cell, it is stored the time just often that measures by this time measuring unit and passes through the detected current value just often of described current detecting unit; And diagnosis unit, time during unusual during its described brake verification switch motion that will measure by described time measuring unit and current value and described stored time and current value just often compare, to diagnose the state of described dc electromagnetic brake.
According to technical scheme 3, can more accurately carry out abnormal examination.
In addition, according to any one in the technical scheme 1 to 3, the control device for lift brake of technical solution of the present invention 4 is characterised in that, the relation between the current value of described drg winding of flowing through when stroke by making described dc electromagnetic brake and described brake verification switch motion forms the relation of linear approximation, infers the length of stroke.
According to technical scheme 4, owing to can infer the stroke of brake gear, so when detecting brake gear unusual, can judge that this is which kind of is unusual (as brake pad wear or sneaked into foreign matter etc.) unusually.
In addition, according to any one in the technical scheme 1 to 3, the control device for lift brake of technical solution of the present invention 5 is characterised in that, by the control brake electric current, make its build up time be later than the time constant of described drg winding, current value and opening time when detecting and measuring described brake verification switch motion with this.
According to technical scheme 5, owing to can not be subjected to the influence of the time constant of drg winding, so the exciting current in the time of can be more accurately to the brake verification switch motion detects, thereby more the variation of stroke is inferred on precision ground, but also can in the long time, send the braking current instruction at leisure, so, because the electric current variation slowly, so do not need high-revolving current sensing means.
In addition, according to any one in the technical scheme 1 to 3, the control device for lift brake of technical solution of the present invention 6 is characterised in that to have communication unit, it diagnoses the state of described dc electromagnetic brake device, and time dependent variation or error state are sent to Control Centre.
According to technical scheme 6, because can be when detecting brake gear unusual, send detected abnormal information by communication unit, thus the fault that can accomplish to prevent brake gear in possible trouble, thereby can avoid elevator because of the brake gear et out of order stop the service.
The invention effect
According to the present invention, not needing to set up special device just can be to the detecting of dc electromagnetic brake unusually, and the influence of the operating position of electric current strain can not be subjected to the drg action time and brake verification switch.
Description of drawings
Fig. 1 is structure (during release) instruction diagram that is provided with the brake gear of brake verification switch;
Fig. 2 is structure (during attraction) instruction diagram that is provided with the brake gear of brake verification switch;
Fig. 3 is integral structure figure of the present invention;
Fig. 4 is the electrical circuit diagram of brake gear;
Fig. 5 is the timer-operated exemplary plot of action of response of expression braking current and brake verification switch;
Fig. 6 is that brake pad has produced the dc electromagnetic brake figure when wearing and tearing;
Fig. 7 is the figure that concerns between expression braking current and the stroke;
Fig. 8 be the expression brake verification when switch activated the drg starting current and stroke between the figure that concerns.
Nomenclature
1 motor reel
2 brake wheels
3a, 3b brake pad
4a, 4b brake shoe
5a, 5b armature
6a, 6b spring
7a, 7b iron core
8a, 8b drg winding
9a, 9b brake verification switch
10 elevator control gears
11 brake controllers
12 master control means
13 power supplys
14 on-off elements
15 dc electromagnetic brakes
16 current detecting units
17 time measuring units
18 memory cell
19 diagnosis units
20 communication units
21 Control Centre
22a, the 22b trip distance
The specific embodiment
Followingly one embodiment of the present invention is described with reference to accompanying drawing.
Fig. 1 is structure (during release) instruction diagram that is provided with the brake gear of brake verification switch, Fig. 2 is structure (during attraction) instruction diagram that is provided with the brake gear of brake verification switch, Fig. 3 is integral structure figure of the present invention, Fig. 4 is the electrical circuit diagram of brake gear, Fig. 5 is the timer-operated exemplary plot of action of response of expression braking current and brake verification switch, Fig. 6 is that brake pad has produced the dc electromagnetic brake figure when wearing and tearing, Fig. 7 is the figure that concerns between expression braking current and the stroke, Fig. 8 be the expression brake verification when switch activated the drg starting current and stroke between the figure that concerns.
As shown in Figure 1, dc electromagnetic brake 15 has: with motor reel 1 bonded assembly brake wheel 2; Be installed in drg winding 8a, 8b that being used on iron core 7a, the 7b produces attractive force; The armature 5a, the 5b that when this drg winding 8a, 8b switch on, are attracted; Because this armature 5a, 5b is attracted and the brake shoe 4a, the 4b that move towards the direction left from brake wheel 2; Be installed in brake pad 3a, 3b on this brake shoe 4a, the 4b; Give armature 5a, 5b spring 6a, 6b with recuperability; And detect brake verification switch 9a, the 9b whether armature 5a, 5b are attracted.
In the embodiment in figure 1,2 places about drg is set at, and each drg has brake verification switch 9a, 9b respectively.
When this dc electromagnetic brake 15 flows through drg winding 8a, 8b at electric current, overcome the braking force of spring 6a, 6b and attract each armature 5a, 5b, make brake pad 3a, 3b leave brake wheel 2, thereby make lift car be in the state that can travel.
As shown in Figure 2, after armature 5a, 5b were attracted fully, each brake verification switch 9a, 9b independently carried out work by mechanical action.In addition, when lift car stops, armature 5a, 5b are restored, brake pad 3a, 3b are contacted with brake wheel 2 and produce braking force by cutting off electric current.
The structure of Fig. 3 comprises: be connected the current detecting unit 16 on drg winding 8a, the 8b in the dc electromagnetic brake 15; Obtain the main control unit 12 in the brake controller 11 of current feedback value from this current detecting unit 16; Current instruction value is input to elevator control gear 10 in this main control unit 12; According to the voltage of power supply 13 being carried out conversion and it is applied to on-off element 14 on drg winding 8a, the 8b from the voltage instruction value of main control unit 12 output; Time measuring unit 17 according to signal measurement opening time of brake verification switch 9a, 9b; Store this opening time and by the memory storage 18 of current detecting means 16 detected current values; Diagnosis unit 19 according to the state of this opening time and current value diagnosis brake gear; And the communication unit 20 that communicates with Control Centre 21.
In Fig. 4, the R among the figure is the real component of brake circuit, and drg winding 8a, 8b connect side by side with respect to power supply 13, and current detecting unit 16 is connected in series with respect to power supply 13.
So what current detecting unit 16 was detected is the aggregate value that flows through the exciting current of each drg winding 8a, 8b.
And, in current detecting unit 16, can use the non-contact current sensor that has adopted common Hall unit, make winding run through sensor and carry out current detecting.
Solid line illustration in Fig. 5 (a) response of dc electromagnetic brake 15 braking current just often and brake verification switch 9a, 9b action regularly.
With respect to stair-stepping current-order I *, the exciting current of drg winding 8a, 8b is just often shown in the solid line of Fig. 5 (a), and it is owing to resulting from the ground follow current instruction that lags behind of the time constant of inductance of drg winding 8a, 8b.
But, when brake pad 3a, 3b begin when the brake surface of brake wheel 2 is attracted, as the t of Fig. 5 (a) 1Shown in the time point, electric current begins to produce strain, after attracting fully, and brake verification switch 9a, 9b action, electric current increases and follows command value once more.
At this moment, produce deviation sometimes in the action of 2 brake verification switch 9a, 9b regularly, this is that the hysteresis of the mechanical action that causes owing to the small installation error of the brake verification switch in each drg etc. produces.
The signal of each brake verification switch 9a, 9b is imported in the time measuring unit 17 in the brake controller 11, by obtaining the time difference of this timing when importing with the brake switch signal, obtains t run up time of brake verification switch 9a, 9b 1, t 2, and with this moment drg starting current I 1, I 2Be stored in together in the memory storage 18.
Fig. 6 is illustrated in the dc electromagnetic brake 15 of Fig. 1, situation when having only brake pad 3b that wearing and tearing have taken place, as shown in Figure 6, the stroke 22b between brake pad 3b armature 5b that worn-down right side drg taken place and the iron core 7b and the brake pad 3a armature 5a that is in the left side drg of normal condition compares elongated with stroke 22a between the iron core 7a.
So, when stroke 22b is elongated, magnetic circuit constant between armature 5b and the iron core 7b changes, its result, it is big that time constant becomes, and therefore needs bigger electromagnetic attraction, and the electric current that flows through drg winding 8b when the brake verification switch motion becomes big with just often comparing, and, and cause the rising of braking current to lag behind because time constant becomes big.So, attract drg just to need bigger electric current, the response time of braking current changes.
The t ' opening time of the brake verification switch 9b of worn-down right side drg has taken place in brake pad 3b 2With t opening time just often 2Between bigger difference appears, the state shown in the dotted line the when action of brake verification switch 9a, 9b regularly forms as Fig. 5 (a) unusual.Its reason is, as implied above, 22b is elongated because of stroke, needs the longer time till armature 5b begins to be attracted, thus, and drg starting current I ' 2Also than just often drg starting current I ' 2Bigger.
So, produced when unusual drg starting current I when brake gear 1, I 2T opening time with brake verification switch 9a, 9b 1, t 2To change.
So, in diagnosis unit 19, specified action time and the current value of obtaining according to the observed reading under design value or the normal condition in advance compared, and variation monitors to time dependent, can detect the unusual of brake gear thus.
More accurately detect the unusual of brake gear if desired, can set the braking current instruction for bulb-shaped detect braking current and brake verification switch motion time.
Solid line illustration among Fig. 5 (b) braking current instruction be configured to action when bulb-shaped, the response of braking current just often and brake verification switch 9a, 9b regularly.
At this moment, set for the braking current instruction bulb-shaped, make build up time be later than the time constant of drg winding 8a, 8b, thus, if the spring constant of spring 6a, 6b does not change, then should diminishing of armature 5a, the electric current that taken place when 5b begins to be attracted compared the drg starting current I in the time of can more accurately moving to brake verification switch 9a, 9b with stair-stepping braking current instruction R1, I R2Detect.
The dotted line illustration of Fig. 5 (b) braking current response when braking current instruction is set at unusual (wearing and tearing have taken place brake pad 3b) when bulb-shaped and the action timing of brake verification switch 9a, 9b.
At this moment, the braking current instruction is later than the time constant of drg winding 8a, 8b, and does not also have too much electric current to flow among the drg winding 8b of anomalous lateral, so, the drg starting current I ' during brake verification switch 9a action R1Identical with value just often.
Fig. 7 is the graph of a relation of braking current and stroke, in Fig. 7, relation just often represents with solid line, make drg winding 8a, 8b energising in order to attract armature 5a, 5b after, in a period of time, under the effect of the spring force of spring 6a, 6b, armature 5a, 5b do not move, and from lighting sometime, armature 5a, 5b begin to move, by the operating position of brake verification switch 9a, 9b, contact with iron core 7a, 7b.The relation of relation between electric current during release and the stroke when attracting is opposite, shows hysteresis characteristic as shown in Figure 7.
Situation when the dotted line of Fig. 7 represents that stroke is elongated.Because the energy that armature 5a, 5b are moved increases, so the electric current that flows through is more.Situation when long and short dash line represents that stroke shortens, the situation when elongated with stroke is opposite, can make brake verification switch 9a, 9b action with littler electric current.
Therefore, the drg starting current in brake verification switch 9a, 9b when action and the relation between the stroke are l with the length setting of stroke as shown in Figure 8, when current value is set at i,
Can form the relation of the linear approximation shown in formula l=ai+b.A in the formula, b are constant.
According to above-mentioned normal brake gear, the current value when making brake verification switch activated in advance and the relation of stroke form formulism, then can infer stroke according to measured current value.
In addition, the threshold setting with stroke shown in Figure 8 is Xmin~Xmax in advance, and thus, the threshold value of current value also is confirmed as Imin~Imax, so, when the current value when the brake verification switch motion has exceeded this scope, can be detected. as unusual.
Its result, braking current instruction is being set at when stepped, the opening time of brake verification switch 9a, 9b and the drg starting current of this moment can be compared with specified action time and the current value obtained according to the observed reading under design value or the normal condition in advance, and time dependent changed monitor, can detect the unusual of brake gear thus.
In addition, bulb-shaped by the braking current instruction is set at, can more accurately detect the drg starting current, can infer stroke according to the relation between stroke and the drg starting current.
The diagnostic work of above-mentioned brake gear is undertaken by diagnosis unit 19, is detecting when unusual, sends these abnormal condition by communication unit 20 to Control Centre 21.In addition, by also data being monitored at ordinary times, carry out telemonitoring so can change to time dependent.
Its result can set suitable maintenance cycle aspect the brake pad exchange, the fault that can accomplish to prevent brake gear is in possible trouble, thereby can avoid elevator to stop service because of the brake gear et out of order.

Claims (6)

1. a control device for lift brake has: plural at least dc electromagnetic brake; The brake verification switch, it is separately positioned in each described dc electromagnetic brake, is used to detect the open and-shut mode of drg; Main control unit, it instructs described dc electromagnetic brake to open and close; Current detecting unit, its detection flow through the exciting current of the drg winding of described dc electromagnetic brake; And brake circuit, it makes exciting current flow through described drg winding by described main control unit, and this control device for lift brake is characterised in that,
Further has memory cell, it is stored in advance by the detected current value just often of described current detecting unit, and has a diagnosis unit, the current value of its current value just often during with described brake verification switch motion when unusual compares, to diagnose the state of described dc electromagnetic brake.
2. a control device for lift brake has: plural at least dc electromagnetic brake; The brake verification switch, it is separately positioned in each described dc electromagnetic brake, is used to detect the open and-shut mode of drg; Main control unit, it instructs described dc electromagnetic brake to open and close; Current detecting unit, its detection flow through the exciting current of the drg winding of described dc electromagnetic brake; And brake circuit, it makes exciting current flow through described drg winding by described main control unit, and this control device for lift brake is characterised in that,
Further have: time measuring unit, it is measured and to send drg from described main control unit and open and close instruction and play time till described brake verification switch begins to move; Memory cell, the time just often that its storage measures by this time measuring unit; And diagnosis unit, time and described stored time just often during unusual during its described brake verification switch motion that will measure by described time measuring unit compare, to diagnose the state of described dc electromagnetic brake.
3. a control device for lift brake has: plural at least dc electromagnetic brake; The brake verification switch, it is separately positioned in each described dc electromagnetic brake, is used to detect the open and-shut mode of drg; Main control unit, it instructs described dc electromagnetic brake to open and close; Current detecting unit, its detection flow through the exciting current of the drg winding of described dc electromagnetic brake; And brake circuit, it makes exciting current flow through described drg winding by described main control unit, and this control device for lift brake is characterised in that,
Further have: time measuring unit, it is measured and to send drg from described main control unit and open and close instruction and play time till described brake verification switch begins to move; Memory cell, it is stored the time just often that measures by this time measuring unit and passes through the detected current value just often of described current detecting unit; And diagnosis unit, time during unusual during its described brake verification switch motion that will measure by described time measuring unit and current value and described stored time and current value just often compare, to diagnose the state of described dc electromagnetic brake.
4. as each described control device for lift brake in the claim 1 to 3, it is characterized in that, the relation between the current value of described drg winding of flowing through when stroke by making described dc electromagnetic brake and described brake verification switch motion forms the relation of linear approximation, infers the length of stroke.
5. as each described control device for lift brake in the claim 1 to 3, it is characterized in that, by the control brake electric current, make its build up time be later than the time constant of described drg winding, current value and opening time when detecting and measuring described brake verification switch motion with this.
6. as each described control device for lift brake in the claim 1 to 3, it is characterized in that having communication unit, it diagnoses the state of described dc electromagnetic brake device, and time dependent variation or error state are sent to Control Centre.
CN2007101621447A 2007-01-10 2007-12-21 Elevator brake control device Active CN101224831B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2007002487 2007-01-10
JP2007002487A JP4685803B2 (en) 2007-01-10 2007-01-10 Elevator brake control device
JP2007-002487 2007-01-10

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CN101224831B CN101224831B (en) 2011-04-13

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