CN2181079Y

CN2181079Y - Reverseble electronic delay, link-locking device for contactor

Info

Publication number: CN2181079Y
Application number: CN 94202244
Authority: CN
Inventors: 罗时旺
Original assignee: Guilin Machine-Tool Electric Appliances Factory Guangxi Zhuang Nationality Auto
Current assignee: Guilin Machine-Tool Electric Appliances Factory Guangxi Zhuang Nationality Auto
Priority date: 1994-01-26
Filing date: 1994-01-26
Publication date: 1994-10-26
Anticipated expiration: 2004-01-26

Abstract

The utility model provides a reversible electronic delay interlocking device for a contactor, mainly composed of two groups of symmetrical electronic switches, a delaying triggering switch, a signal detection switch and interlocking switches. The utility model uses the electronic switches to switch on an electromagnetic coil in a delaying mode to prolong the switching time; the electronic interlocking switches are used to interlock to prevent two contactors from the simultaneous attraction; accordingly, the failures of short circuit of an electric arc and metallic direct short circuit can be completely avoided. The device has good reliability, high generalization degree, high operation frequency and easy electromechanical integration realization, and an independent power supply does not need; the utility model is suitable for the reversible switching and the star and angle switching of various motors for the industrial production.

Description

Reverseble electronic delay, link-locking device for contactor

The utility model relates to the control technology of motor, specifically a kind of reversible conversion electron time-delay, interlock of contactor.

But the air type electromagnetic contactor is generally adopted in the motor inverse conversion of using in the industrial production, the conversion of star angle, and its arc-extinguishing medium is an air, and the power that drives the main contact closure is the electromagnetic attraction that the solenoid energising produces.For preventing arc short circuit or metallicity direct short-circuit, prior art is used following two kinds of schemes: 1, use the star angle conversion of rotating, plug braking and the threephase motor of two contactor wheel current control motor, for preventing that two contactors are in on-position simultaneously at synchronization, can between two contactors, increase electric or mechanical interlocking.Select adhesive long contactor operate time, prolong conversion action time,, increase auxiliary relay in case of necessity and solve as satisfying the time requirement of branch deenergizing arc extinguishing.2, adopt the action of " stopping-starting " two-step method manual operation control transformation.Utilize the manually operated time interval in two steps to prolong conversion action time.It is limited that the former prolongs conversion action time, make control circuit complicated and increase auxiliary relay, in frequent conversion, because the duration of electric arc conduction state is at random, multiple factor affecting such as voltage, electric current, phase place, contact temperature when being subjected to disjunction, by the technical specification regulation, the electric arc maximum length in time allows to reach 0.1 second, even increase the still difficult time requirement of satisfying arc extinguishing fully of auxiliary relay, so still difficulty avoids the arc short circuit fault to take place fully; Latter's complex operation is easily made mistakes, and can not be suitable for the occasion use that travel switch, limit switch and other electrical equipment are controlled automatically.

The purpose of this utility model provides a kind of time-delay of reversible conversion electron, interlock of contactor, and it can avoid arc short circuit fully, prevents that two contactors from connecting simultaneously and metallicity direct short-circuit fault takes place.

In order to achieve the above object, the technical scheme that the utility model is taked is: the two ends that are connected power supply after the solenoid 1KM of a contactor and rectifier A, electronic switch A, detector A connect mutually, electronic switch A is used to control the break-make of 1KM, and the running current signal that detector A is used to take out 1KM is delivered to the control end i of interlocking switch A ₁, a time-delay trigger A is connected the control end G of electronic switch A ₁, be used to provide the time-delay trigger impulse.Make the conducting of electronic switch A on-delay, prolong conversion action time.After connecting mutually, the solenoid 2KM of a contactor and rectifier B, electronic switch B, detector B be connected the two ends of power supply, electronic switch B is used to control the break-make of 2KM, and the running current signal that detector B is used to take out 2KM is delivered to the control end i of interlocking switch B ₂, a time-delay trigger B is connected the control end G of electronic switch B ₂, be used to provide the time-delay trigger impulse.Make the conducting of electronic switch on-delay, prolong conversion action time.Described electronic switch A is controlled by interlocking switch B, and electronic switch B is controlled by interlocking switch A, reciprocal interlocks, and electronic switch A conducting B ends, and B conducting A cuts, thereby avoids arc short circuit and prevent that metallicity direct short-circuit fault from taking place.

The utility model has the advantages that: 1, good reliability, can avoid arc short circuit fully and prevent the contactor misoperation; 2, generalization degree height, the contactor of various model specifications all can use; 3, adaptability is strong, but can be used for inverse conversion, the conversion of star angle, both has been fit to the manual control of push-button switch, also is fit to the automatic control of travel switch, limit switch and other electrical equipment; 4, little, simple in structure, the power consumptive province of volume, cost low, realize machine easily---electrical integrated; 5, flexible for installation, wiring is few, easy to use.

Fig. 1 is the reversible conversion electron time-delay of this contactor, the structural representation of interlock.

Fig. 2 is the operation principle block diagram.

Fig. 3 is a circuit diagram.

The contrast accompanying drawing describes in further detail the utility model below.

In Fig. 1, the 1st, the binding post, the 2nd of connecting with contactor coil 1KM, the binding post of connecting with contactor coil 2KM, the 3rd, power supply terminal, the 4th, housing, the 5th, printed circuit board, the 6th, base, the 7th, install and fix the hole.

Fig. 2 is the operation principle block diagram.From scheming as seen, it is by two groups of symmetrical electronic delays---and interlocking switch constitutes, and forms with bridge rectifier, electronic switch, time-delay triggering, input and interlocking switch again for every group.The operation if solenoid 2KM has switched on, electric current I forms the loop through 2KM → 2 → rectifier B → electronic switch B → detector B → 3, and detector B detects running current signal driving interlocking switch B locking stops triggering, and electronic switch A ends; When the 2KM outage, 1KM gets when electric, and the 2KM electric current is zero (main contact disconnection arcing), and the signal voltage of detector B also is zero, make interlocking switch B unlocking, time-delay trigger A trigger, the electric arc between about 0.2S(2KM main contact extinguishes) after, trigger electronic switch A conducting, 1KM has electric current to pass through and adhesive, meanwhile, detector A sends interlocking signal, drives interlocking switch A locking time-delay trigger B is quit work.Because electronic switch speed is exceedingly fast (the microsecond order of magnitude), the interlocking process is almost finished in moment, be that 1KM is just by also not adhesive of electric current, 2KM is interlocked, so a conducting can only be arranged and another ends at synchronization two electronic switches, thereby prevent arc short circuit and metallicity direct short-circuit.More than be the situation that exchanges control,, bridge rectifier can be omitted if be used in DC control.

Fig. 3 is a circuit diagram.From scheming as seen, it by about electronic switch, time-delay triggering, input, the electronic interlocking switch that reciprocal interlocks of two groups of symmetries constitute.Identical because of the circuit on both sides, for ease of describing, only the left side wherein is illustrated for one group.Electronic switch is thyristor V ₁Delay trigger circuit is by R ₁, C ₁The RC circuit of forming constitutes, its charge constant=R ₁C ₁＞0.2S adjusts R ₁Can change the time constant of RC, C ₁Charging voltage be about 0.2S from the time that rises to trigger voltage (about 0.7V) above freezing, the time constant of choose reasonable RC can satisfy time-delay and triggering requirement.R ₃Make the input usefulness of running current, it and pressure limiting diode V ₃After the parallel connection again with V ₁, U ₁, 1KM is in series and inserts the two ends of power supply, as long as there is electric current to pass through, just can detect the signal of running current, at V ₁Conduction period, flow through the pressure drop that the electric current of R3 and V3 produces and be about 0.7V on these two elements, this voltage plays two effects, and the one, be that the base stage of triode V5 provides forward current to interlocking switch, make V5 by by becoming conducting, make C ₂Two terminal shortcircuits are with V ₂Locking prevents to mislead; The 2nd, at V ₁Conduction period is raised its cathode potential, thereby makes C ₁On voltage remain on about 0.7V, at V ₁The current cycle zero passage moment, R ₃And V ₃On voltage be zero, C ₁On voltage can make V ₁Keep conducting, R ₅, R ₇Be current-limiting resistance, RV ₁Be piezo-resistance, U ₁Be bridge rectifier.

The circuit and the left side on the right are just the same, conversely, and the circuit working on the right, interlocking switch V ₆Just the V on the left side ₁Locking, two contactors take turns to operate, and " collision " accident can not take place.

In frequent conversion, C ₁And C ₂By V6 and V5 discharge, in time perform time-delay and prepare respectively, can reduce delay time error, allow the frequency of operation height.

Claims

1, a kind of reversible conversion electron time-delay, interlock of contactor comprise contactor, it is characterized in that it also comprises:

-and rectifier A, electronic switch A, the detector A of the solenoid 1KM of contactor series connection, after connecting mutually, they are connected the two ends of power supply, electronic switch A is used to control the break-make of 1KM, and the running current signal that detector A is used to take out 1KM is delivered to the control end i of interlocking switch A ₁, a time-delay trigger A is connected the control end G of electronic switch A ₁, be used to provide delay triggering signal, make the conducting of electronic switch A on-delay;

-and rectifier B, electronic switch B, the detector B of the solenoid 2KM of contactor series connection, after connecting mutually, they are connected the two ends of power supply, electronic switch B is used to control the break-make of 2KM, and the running current signal that detector B is used to take out 2KM is delivered to the control end i of interlocking switch B ₂, a time-delay trigger B is connected the control end G of electronic switch B ₂, be used to provide delay triggering signal, make the conducting of electronic switch B on-delay;

-described electronic switch A is controlled by interlocking switch B, and electronic switch B is controlled by interlocking switch A, reciprocal interlocks, and electronic switch A conducting B ends, and B conducting A ends.