CN203474155U

CN203474155U - Elevator overspeed protection device

Info

Publication number: CN203474155U
Application number: CN201320553015.1U
Authority: CN
Inventors: 郑世云; 伍克林; 李彬
Original assignee: Chongqing Macro Lift Co Ltd
Current assignee: Chongqing Macro Lift Co Ltd
Priority date: 2013-09-06
Filing date: 2013-09-06
Publication date: 2014-03-12
Anticipated expiration: 2023-09-06

Abstract

The utility model discloses an elevator overspeed protection device for solving the problem that elevator overspeed protection cannot be achieved due to the fact that contacts of a direct star sealing device are easily burnt out. The elevator overspeed protection device comprises a control part and a primary loop part, the control part comprises a controller and a rectifier, the primary loop part comprises frequency changers, operation contactors and a permanent magnetic synchronization tractor, each frequency changer is connected with input ends of three phases of windings of the permanent magnetic synchronization tractor, one operation contactor is connected to the circuit between each frequency changer and the permanent magnetic synchronization tractor in series, the control part further comprises a star sealing contactor coil and a delay circuit connected with the star sealing contactor coil in parallel, a normally-closed contact of the star sealing device is connected to the circuit between each operation contactor and the input ends of the two phases of the windings of the permanent magnetic synchronous tractor in parallel, and a normally-opened contact of a star sealing contactor is connected with the coil of each operation contactor in series. According to the elevator overspeed protection device, the independent star sealing contactors and the delay circuit are adopted, so that the contacts of the star sealing contactors are easily burnt out, and the star sealing contactors are effectively protected.

Description

Elevator overspeed protecting device

Technical field

The utility model relates to elevator technology, is specifically related to a kind of elevator overspeed protecting device.

Background technology

The engine installation of elevator lifting is towing machine, towing machine mainly comprises permanent magnetic synchronous traction machine and traditional worm and gear towing machine, and because permanent magnetic synchronous traction machine has energy-conservation, the plurality of advantages such as noise is low, ride comfort, substitute rapidly traditional worm and gear towing machine, occupied the market share of elevator drive main frame 95%.

The overspeed protection device of tradition worm and gear towing machine adopts safety tongs to protect as overspeed descending, and wire holder is as up-running over-speed protection, the drg that the protection device for over-speed ascending that permanent magnetic synchronous traction machine adopts is self.

But this overspeed protection device of permanent magnetic synchronous traction machine also has the following disadvantages: compare traditional worm and gear main frame, it is large more than more than 10 times that elevator brake moment is wanted, very high to elevator brake requirement, causes elevator brake easily to lose efficacy; Because permanent magnetic synchronous traction machine does not have drop-gear box, unlike traditional worm and gear towing machine, there is mechanical self-latching, once misfunctioning of brake, elevator will accelerate rapidly, the car that slips operation.

Permanent magnetic synchronous traction machine adopts directly envelope star to realize up-running over-speed protection conventionally; so-called envelope star; be permanent magnetic synchronous traction machine by three-phase winding leading-out wire by wire or series resistance by star connection; directly envelope star is all connected in series and moves contactless switch between three phase winding input ends of frequency converter and permanent magnetic synchronous traction machine; when elevator promptly stops ladder because of fault; the normally closed contact adhesive of operation contactless switch; motor short circuit; rotor resistance is very large; and then stop motor to continue to drive cage operation, to reach the object of overspeed protection.

Although directly envelope star can make elevator enter the starlike state of envelope fast; if but promptly stopped because of fault at elevator terraced in the situation that; because motor is also at High Rotation Speed; directly Feng Xinghui produces very large short circuit current; to make to seal star burning of contact; directly envelope star device loses protective effect, to passenger, brings great potential safety hazard.

Utility model content

The utility model provides a kind of elevator overspeed protecting device, cannot realize the problem of elevator overspeed protecting function to solve the direct envelope star device contact easy burn-out existing in prior art.

In order to solve the problems of the technologies described above, the utility model adopts following technical scheme:

Elevator overspeed protecting device, comprise control part and major loop part, described control part comprises controller and rectifier, controller connects the input end of rectifier, major loop partly comprises frequency converter, operation contactless switch and permanent magnetic synchronous traction machine, described frequency converter joins with three phase winding input ends of permanent magnetic synchronous traction machine respectively, series operation contactless switch on the circuit between frequency converter and permanent magnetic synchronous traction machine, control part also comprise envelope star contactor coil and with the time delay circuit of envelope star contactor coils from parallel connection of coils, described time delay circuit comprises electric capacity and the resistance of serial connection, the normally closed contact of envelope star contactor in parallel between operation contactless switch and permanent magnetic synchronous traction machine winding input end, in control part, the open contact of envelope star contactor is connected with the coil of operation contactless switch.

The principle of the utility model overspeed protection device is as follows:

When elevator is out of service:

Controller cuts off output, through time delay, the coil adhesive of the envelope star contactor between operation contactless switch and permanent magnetic synchronous traction machine winding input end, form closure state, permanent magnetic synchronous traction machine three phase winding short circuits, thereby make permanent magnetic synchronous traction machine produce magnetic field, and then the generation lock torque contrary with rolling direction, if elevator brake lost efficacy, overbalance due to lift car and counterweight, to cause elevator to slip car to a side who lays particular stress on, now owing to having adopted described utility model device, elevator traction motor is the envelope star safety guard-safeguard state after time delay, at this moment elevator dragging wire rope drives towing machine rotation and produces the lock torque contrary with elevator rolling direction, reach and hinder elevator and slip the object that vehicle speed accelerates, and then elevator is slipped to vehicle speed be stabilized in a very low scope, thereby actv. protection passenger and lift facility.

In the situation that the normally closed contact adhesive of envelope star contactor, the open contact of envelope star contactor, in off-state, disconnects the loop between frequency converter and towing machine, thereby avoids after towing machine three phase winding short circuits, frequency converter continues output, and causes frequency converter to damage.

Permanent magnetic synchronous traction machine is through the time delay Feng Xinghou of this device, can avoid that High Rotation Speed causes moment heavy current impact, reached envelope star object, reached again delay protection effect.

Elevator operation: controller is controlled output, and rectifier is converted to direct current (DC) by alternating current, the normally closed contact of envelope star contactor disconnects, open contact adhesive, and the normally closed contact adhesive of operation contactless switch is connected the loop between frequency converter and towing machine, drive motor rotation, and then elevator brings into operation.

To sum up; the utility model adopts and independently seals star contactor and time delay circuit, and when elevator promptly stops ladder because of fault, time delay circuit will provide the continuous electric current of short time to envelope star contactor; make to seal star contactor time delay; and first allow drg work, after deceleration of elevator, then the normally closed contact adhesive that makes to seal star contactor; elevator is carried out to overspeed protection; like this, the contact of envelope star contactor is easy burn-out not, actv. tamper seal star contactor.

Further, in order to give circuit protection when envelope star contactor disconnects, at the two ends of described envelope star contactor, be also parallel with diode.

Accompanying drawing explanation

Fig. 1 be in the utility model elevator overspeed protecting device embodiment control part circuit diagram;

Fig. 2 is that in the utility model elevator overspeed protecting device embodiment, major loop partly seals the circuit diagram of star contactor in normally off;

Fig. 3 is that in the utility model elevator overspeed protecting device embodiment, major loop partly seals the circuit diagram of star contactor in normally open.

The specific embodiment

Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:

As Fig. 1, elevator overspeed protecting device shown in Fig. 2, comprise control part and major loop part, control part comprises controller 1 and rectifier 2, controller 1 connects the input end of rectifier 2, major loop partly comprises frequency converter 4, operation contactless switch 5 and permanent magnetic synchronous traction machine 3, frequency converter 4 joins with three phase winding input ends of permanent magnetic synchronous traction machine 3 respectively, equal series operation contactless switch 5 on the circuit between each frequency converter 4 and permanent magnetic synchronous traction machine 3, control part also comprises envelope star contactor 6 and the time delay circuit in parallel with envelope star contactor 6, two ends at envelope star contactor 6 are also parallel with diode 9, time delay circuit comprises electric capacity 8 and the resistance 7 of serial connection, as shown in Figure 2, a normally closed contact 61 of envelope star contactor 6 in parallel on circuit between operation contactless switch 5 and a phase winding input end of permanent magnetic synchronous traction machine 3, another normally closed contact 62 of envelope star contactor 6 in parallel on circuit between operation contactless switch 5 and another phase winding input end of permanent magnetic synchronous traction machine 3.

Principle of work when elevator is out of service is as follows:

Controller cuts off output, through time delay, the coil adhesive of the envelope star contactor between operation contactless switch and permanent magnetic synchronous traction machine winding input end, form normally off, permanent magnetic synchronous traction machine three phase winding short circuits, thereby make permanent magnetic synchronous traction machine produce magnetic field, and then the generation lock torque contrary with rolling direction.

And in the situation that the normally closed contact adhesive of envelope star contactor, the loop between frequency converter and towing machine disconnects, thereby avoids after towing machine three phase winding short circuits, frequency converter continues output, and causes frequency converter to damage.

As shown in Figure 3, for major loop partly seals the circuit diagram of star contactor in normally open, its open contact 63 as shown in the figure.

Wherein, the effect of each several part in foregoing circuit structure: controller, control inputs, output;

Rectifier, is converted to direct current (DC) by the alternating current of controller input;

Resistance, buffer action, can current limliting filling, during side's electricity;

Electric capacity, stored energy, when controller cuts off output, gives envelope star contactor a very short freewheel current, and the time delay of envelope letter contactless switch is disconnected;

Diode gives circuit protection when envelope star contactor disconnects;

Frequency converter, has output during elevator operation, drives permanent magnetic synchronous traction machine rotation;

Operation contactless switch, during elevator operation, the adhesive of operation contactless switch, allows the loop between frequency converter and motor connect;

Envelope star contactor, when elevator is out of service, the normally closed contact adhesive of envelope star contactor, makes motor three phase winding short circuits;

Permanent magnetic synchronous traction machine, drives elevator to move up and down while normally moving; During misfunctioning of brake, a square tube of being laid particular stress on by car or counterweight is crossed steel rope and is driven its rotation.

The utility model utilizes permanent magnetic synchronous traction machine to carry the feature in magnetic field; time delay short circuit permanent magnetic synchronous traction machine three phase windings; the braking torque that utilizes generating to produce slows down and slips car; allow elevator in the situation that of misfunctioning of brake; with very low speed operation; speed can be less than 0.1 meter per second, to reach the object of protection passenger and device security.

Claims

1. elevator overspeed protecting device, comprise control part and major loop part, described control part comprises controller and rectifier, controller connects the input end of rectifier, major loop partly comprises frequency converter, operation contactless switch and permanent magnetic synchronous traction machine, described frequency converter joins with three phase winding input ends of permanent magnetic synchronous traction machine respectively, equal series operation contactless switch on the circuit between each frequency converter and permanent magnetic synchronous traction machine, it is characterized in that, control part also comprise envelope star contactor coil and with the time delay circuit of envelope star contactor coils from parallel connection of coils, described time delay circuit comprises electric capacity and the resistance of serial connection, the normally closed contact of all parallel connection envelopes star contactor on the wherein circuit between two phase winding input ends of operation contactless switch and permanent magnetic synchronous traction machine, in control part, the open contact of envelope star contactor is connected with the coil of operation contactless switch.

2. elevator overspeed protecting device according to claim 1, is characterized in that, at the two ends of described envelope star contactor, is also parallel with diode.