CN2096550U

CN2096550U - Lifting electromagnet controllor

Info

Publication number: CN2096550U
Application number: CN 91218261
Authority: CN
Inventors: 郑显玉
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-07-19
Filing date: 1991-07-19
Publication date: 1992-02-19

Abstract

The utility model relates to a lifting electric magnet controller which is composed of an alternating current power supply, a switch, a breaker, a rectification circuit and a magnetizing circuit whose on-off is controlled by a contactor. The magnetizing circuit provides direct current for an electric magnet. The utility model is characterized in that the lifting electric magnet controller is also provided with a demagnetizing circuit whose on-off is controlled by the contactor. The demagnetizing circuit provides alternating current for the electric magnet. The rectification circuit is also connected with a protective circuit which is composed of two diodes which are connected in series along the reverse direction. The utility model uses back electromotive force generated by the alternating current in the coil to impulse magnetic force generated by direct current voltage. Simultaneously the magnetic force of alternating current can be quickly eliminated. The discharge rate is enhanced. The circuit performance is reliable, the use is safe, and electrical energy is saved.

Description

Lifting electromagnet controllor

The utility model relates to a kind of device of controlling the lifting electromagnet magnetic variable.

Smelting, casting, industries such as communications and transportation are widely used to be used to carry the lifting electromagnet with magnet conductivity object, its control setup mainly is by source of AC, voltage transformer, bridge rectifier circuit, be serially connected with the open contact of the DC contactor at lifting electromagnet two ends, starter button, formation such as change-over swith and indicator lamp, its weak point is, adopt direct current (DC) oppositely to import and carry out demagnetization in the magnet coil, its demagnetization speed is slow, inefficiency, also having residue residual magnetism voltage simultaneously exists, make after the electromagnet outage still some residual materials of sticking, this not only influences the effect of suction next time, also can cause the material electromagnet that clashes, thereby damage electromagnet easily, influence its service life.

The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, provides a kind of demagnetization speed fast, safe and reliable lifting electromagnet control setup.

Technical solution of the present utility model is: the lifting electromagnet controller comprises that source of AC, rectifying circuit, open contact are serially connected in the AC contactor C between power supply and the rectifying circuit, the master cock K of contactless switch C ₁, two open contacts are serially connected in the magnet coil two ends and link to each other with rectifying circuit and constitute the magnetize DC contactor C in loop of a DC supply ₁, change-over swith K and demagnetization loop, its special character is, described demagnetization loop provides the loop of alternating current for one to electromagnet, it is by ac power supply and be serially connected in the contactless switch C at source of AC and magnet coil two ends ₂Two open contacts constitute, when the lifting electromagnet discharging, connect this loop, utilize alternating current to produce counter potential in coil, impact the magnetic force that vdc produces, make it to rapidly disappear, alternating current has the fast characteristics of disconnected magnetic simultaneously, and magnetic can break rapidly after the outage, thereby can increase work efficiency, also can make electromagnet after outage, no longer include the residue residual magnetism.

Described rectifying circuit is to be made of three unidirectional rectifier diodes.One end of three diodes links to each other with three contacts of AC contactor C respectively, the other end all with the DC contactor C that is connected magnet coil one end ₁Open contact link to each other, provide direct current (DC) by three diodes to electromagnet.Also be provided with a bar protective circuit on rectifying circuit, it is made of the diode of two anti-phase serial connections, and with the open contact of AC contactor C, rectifier diode also connects mutually.Be not reversed voltage, over voltage, rush current puncture with the protection rectifier diode.The punching voltage of protection diode should be less than the punching voltage of rectifier diode.

The open contact two ends of the DC contactor on ac power supply circuit and be connected to resistance with its direct current time relay sj that is connected in series mutually ₂Open contact, it lags behind contactless switch C ₂Disconnect, to eliminate the electric arc that contactless switch produces.

The utility model compared with prior art has following characteristics:

1. utilize alternating current to produce counter potential in coil and impact the magnetic force that vdc produces, can eliminate interchange magnetic force rapidly again simultaneously, improved discharge rate, do not have the residue residual magnetism, thereby do not have defective material absorption.

2. directly adopt three unilateral diode rectifications that have protective circuit, voltage transformer and bridge rectifier circuit need be set, reduced element, reduced cost.

3. circuit performance is reliable, and is safe in utilization, saves electric energy.

4. improved the service life of electromagnet.

Fig. 1 is schematic circuit diagram of the present utility model.

Be described in further detail below in conjunction with accompanying drawing:

As shown in Figure 1, power supply is a three-phase four-wire system, and the mouth of open contact CA, CB, CC, rectifier diode DA, DB, DC three rectifier diode DA, DB, DC that is serially connected with fuse, AC contactor C on three-phase power line A phase line, B phase line, the C phase line respectively successively is through fuse and DC contactor C ₁Open contact C ₁-- ₁One end links to each other, open contact C ₁-- ₁The other end link to each other with magnet coil one end, the other end of coil is through another open contact C of DC contactor ₁-- ₂N links to each other with ground wire, and polyphone constitutes direct current power supply loop thus.With diode D ₁, D ₂, D ₃, D ₄, D ₅, D ₆Anti-phase in twos connection is that cathode terminal links to each other; its anode links to each other with rectifier diode DA, DB, the negative electrode of DC and the end of open contact CA, CB, CC on each phase line respectively; constitute the protective circuit of rectifier diode; the normally closed contact of the current relay IL that is serially connected with AC contactor C, K switch and shields between two phase line A, C is used to connect the power supply of direct current power supply loop.Ac power supply circuit is by the DC contactor C that is serially connected between A, the B phase line ₂Open contact C ₂-- ₁, magnet coil, resistance SR and another open contact C ₂-- ₂Constitute.At the magnet coil two ends and be connected to mutually the resistance FR and the diode of serial connection, the diode two ends also are connected to the normally closed contact C of DC contactor ₁-- ₃, the discharge loop when constituting demagnetization.At open contact C ₂-- ₁, C ₂-- ₂Two ends and be connected to resistance and the open contact SJ of the direct current time relay that is connected in series with it ₂, in order to eliminate DC contactor contact C ₂-- ₁, C ₂-- ₂The electric arc that produces during disconnection.

DC contactor C ₁And C ₂By change-over swith K ₂Link to each other with direct supply, at DC contactor C ₁, C ₂Two ends respectively and be connected to time relay sj ₁, SJ ₂, in K switch ₂With contactless switch C ₁, C ₂Between be serially connected with C respectively ₂Normally closed contact C ₂-- ₃With time relay open contact SJ ₁-- ₁Open contact SJ ₁-- ₁Two ends and be connected to the open contact of intermediate relay J.Between C phase line and zero line N, be serially connected with the normally closed contact of exchange time relay J Js and direct current time relay, also be serially connected with the open contact JJs and the AC intermediate relay J of exchange time relay simultaneously.

Working process of the present utility model is: during work with K ₁Closure is connected AC contactor C, unidirectional rectifying circuit conducting, and the conducting coefficient is 0.675, the direct-flow no load voltage of output is 256.5 volts, when being used for suction, with change-over swith K ₂Be allocated to the ON shelves, DC contactor C ₁Work, open contact C ₁-- ₁, C ₁-- ₂Closure, normally closed contact C ₁-- ₃Disconnect, connect direct current power supply loop, electromagnet charging sticking material, DC relay SJ simultaneously ₁Closure, exchange time relay J Js obtains electricity and connects, and intermediate relay J obtains electricity and connects, in order to DC contactor C ₁Start working after the release.During discharging, with K switch ₂Be connected to the OFF shelves, because the time-lag action of time relay JJs generally was set in 0.5 second--about 1.2 seconds, direct current (DC) is connected by relay J, DC contactor C ₂Open contact C ₂-- ₁, C ₂-- ₂Closure is connected ac power supply circuit, and 380 volts of alternating current are sent in the magnet coil, in order to eliminate the magnetic force that direct current (DC) produces, the normally closed contact C of while contactless switch ₁-- ₃The closed discharge loop of connecting assists to eliminate the magnetic force that direct current (DC) produces, and when time that the overtime relay is set, the open contact of JJs disconnects, and intermediate relay J discharges, and has disconnected the power supply of DC contactor, C ₂Open contact disconnect, the AC erasing loop disconnects, the very fast disappearance of the magnetic force that alternating current produces in magnet coil, thereby unload material.Time relay sj ₂Lag behind contactless switch C ₂Disconnect, to eliminate DC contactor contact C ₂-- ₁, C ₂-- ₂The electric arc that produces.

Claims

1, a kind of lifting electromagnet controller comprises that source of AC, rectifying circuit, open contact are serially connected in the AC contactor C between power supply and the rectifying circuit, the master cock K of contactless switch C ₁, two open contacts are serially connected in the magnet coil two ends and link to each other with rectifying circuit and constitute the magnetize DC contactor C in loop of a DC supply ₁, change-over swith K and demagnetization loop, it is characterized in that described demagnetization loop provides the loop of alternating current for one to electromagnet, it is made of ac power supply and two open contacts being serially connected in the contactless switch at source of AC and magnet coil two ends.

2, lifting electromagnet controller according to claim 1 is characterized in that rectifying circuit is to be made of three unidirectional rectifier diodes.

3, according to claim 1,2 described lifting electromagnet controllers, it is characterized in that the in addition protective circuit of a rectifier diode, it is made of the diode of two anti-phase serial connections, and with the open contact of AC contactor C, rectifier diode mutually and connect.

4, lifting electromagnet controller according to claim 1 is characterized in that the DC contactor C on ac power supply circuit ₂The open contact two ends and the direct current time relay sj that is connected to resistance and is connected in series with it ₂Open contact.