CN202356181U

CN202356181U - Safe electromagnetic sucker circuit

Info

Publication number: CN202356181U
Application number: CN2011204921981U
Authority: CN
Inventors: 王世立
Original assignee: YUNNAN QUJING SHUANGYOU STEEL CO Ltd
Current assignee: YUNNAN QUJING SHUANGYOU STEEL CO Ltd
Priority date: 2011-12-01
Filing date: 2011-12-01
Publication date: 2012-08-01
Anticipated expiration: 2021-12-01

Abstract

The utility model provides a safe electromagnetic sucker circuit. The safe electromagnetic sucker circuit is characterized in that an isolation transformer T2 is connected among a transformer T1 and main loop fusers FU1-3 in the electromagnetic sucker circuit in series through an isolation switch SQ and a breaker QF; and the isolation transformer T2 and the system transformer T1 are same in power. When an electromagnetic sucker has phenomena, such as insulation reduction or one-point ground connection (body contact), the safe electromagnetic sucker circuit disclosed by the utility model is safe and reliable to use, protects a rolling motor bearing and a rolling mechanical bearing and human security of workers, and does not influence the work. The safe electromagnetic sucker circuit disclosed by the utility model is widely used for protecting technical equipment for absorbing iron metal impurities in magnetic selection, logistics loading, travelling and transporting and various crashing.

Description

A kind of safe magnechuck circuit

Technical field

The utility model relates to a kind of safe magnechuck circuit.

Background technology

Magnechuck is absorbed extensive use in the production field such as ferrous metal foreign material protection plant equipment in magnetic separation, logistics loading and unloading, driving carrying and various fragmentation; But the operating circuit of magnechuck exist with its work system in the motor bearings, mechanical bearing Insulation Problems of relevant apparatus be difficult for the difficulty that effectively solves, and then jeopardize the staff personal safety, cause the damage of corresponding mechanical device.Because transformer T1 output voltage 380V or 220V that system uses, its neutral dotted line N is ground connection E.During driving 1 was used, motor bearings M, the mechanical bearing G of magnechuck coil L and rolling often broke down, and can not use, and the personal safety that influences work and staff does not have guarantee.Magnechuck coil L in use in case the appearance insulation reduces or one point earth (body contact), gently then burns out fuse F U, diode V; Heavy then burn out motor bearings M, the mechanical bearing G of magnechuck coil L and rolling.When using the driving magnechuck; If the low or one point earth (body contact) of insulation appears in magnechuck coil L at a point place; Hull current I will up walk to steel wire rope 5 in face of the direction of dotted line 8, to motor bearings wheel M, the mechanical bearing wheel G place of driving dolly 6 or driving cart 2; The neutral dotted line N of electric current I and system transformer T1 forms short circuit, and magnechuck coil L heating is burnt out, and the time that the maintenance return-to-factory needs is long, buys new concentration of expensive; As long as the motor bearings of dolly 6 or cart 2 wheel M, mechanical bearing wheel G roll (work); Will produce short circuit current at the neutral dotted line N of transfer point b place and system transformer T1; Cause arcing or spark, time length will burn out motor bearings M, mechanical bearing G, to staff's also not guarantee of personal safety; Can not use, most importantly influence work and personal safety problem.

Summary of the invention

The utility model purpose provides a kind of safe magnechuck circuit, to solve the deficiency of using the magnechuck technology in existing broken produce, drive a vehicle carrying or the loading and unloading.

A kind of safe magnechuck circuit; The technical scheme that adopts is that system transformer T1 and between major loop fuse F U1-3 in the magnechuck circuit is connected to isolating transformer T2 through isolating switch SQ, circuit breaker Q F; And each item technical parameter of isolating transformer T2 and system transformer T1 is identical; To being connected with the rectification circuit that V1-3 constitutes through A.C. contactor KM between magnechuck coil L, in the loop of magnechuck coil L and A.C. contactor KM, also be serially connected with the power-off protecting circuit of the magnechuck coil L of fly-wheel diode V4 and continued flow resistance R formation at FU1-3.

In the such scheme, the thickness in elementary with the secondary coil turn of the transformer T1 in isolating transformer T2 and the magnechuck circuit and line footpath equates, constitutes the matching structure of 1:1, its secondary coil and ground partition; Isolate the three phase mains of system transformer T1, neutral conductor N (zero line) with the earth 4.

Magnechuck is in each production field magnetic separation, logistics loading and unloading, driving carrying and various fragmentation, and is of many uses in the work such as absorption ferrous metal foreign material protection plant equipment.Magnechuck is when insulation reduction or one point earth phenomenons such as (body contacts) occurring, and present technique can make the safe and reliable use of magnechuck, motor bearings, mechanical bearing that protection is rolled, and protection staff's personal safety does not influence work.And used and the isolating transformer of system transformer, the ability to work of magnechuck is not descended as 1:1.

Description of drawings

Fig. 1 adds magnechuck control work electrical schematic diagram behind the isolating transformer.

Fig. 2 does not add isolating transformer, the current trend figure during the magnechuck fault.

The specific embodiment

Below in conjunction with accompanying drawing,, technical scheme is specified as embodiment.

With reference to Fig. 1, be MW1800 with the solenoid, the magnechuck of electric current 91A is an example; When selecting 1:1 isolating transformer T2 for use, power must be done isolating transformer T2 to SC-50KVA transformer greater than the power of magnechuck L; Be connected in the three phase mains major loop, shell E wants reliable ground.Major loop fuse F U1-3 uses the device of RL1-100A to be serially connected on secondary a that voltage is the isolating transformer of 380V, b, three contacts of c, and isolating switch SQ and supporting fuse QF be the primary coil of the secondary and isolating transformer T2 of welding system transformer T1 respectively.System transformer zero line N joins through earth point E and the earth, and isolating transformer T2 connects the earth through earth point E.The other end at major loop fuse F U1-3 respectively meets commutation diode V1, V2 and a V3; 3 diodes and connect the back its two poles of the earth be connected with A.C. contactor KM respectively; Three commutation diodes are with 2P-200A-1200V specification, and A.C. contactor is with CJ20-160A/380V specification.In the solenoid L holding circuit that constitutes by fly-wheel diode V4 and continued flow resistance R, use the pipe of 2P-100A-1000V and the resistance R of coupling.Fuse F U3 is connected in series fuse F U5 to the circuit of the coil that exchanges contactor KM, fuse F U1 connects K switch and fuse F U4, the wherein device of FU4-5 usefulness RL1-15A to exchanging in the contactor KM coil circuit.

The course of work: control corresponding mechanism is that the three-phase alternating-current supply of system transformer is through isolating switch SQ; To moulded case circuit breaker QF; Being come out afterwards to go here and there the isolating transformer T2 of 1:1 in major loop by QF, is direct current through FU1-3 fuse to the V1-3 diode rectification; The branch of gauge tap K/close, KM main contacts branch/close make magnechuck L get the electrician and do and situation about stopping.Control corresponding mechanism be the three-phase alternating-current supply of system transformer through isolating switch SQ, to moulded case circuit breaker QF, by QF come out the back the isolating transformer T2 of 1:1 string in major loop, process FU1-3 fuse is a direct current to the V1-3 diode rectification; The branch of gauge tap K/close, KM main contacts branch/close make magnechuck L get the electrician and do and situation about stopping.

With reference to Fig. 1,2, add isolating transformer: during installation, be contained in T2 isolating transformer 10 on the crossbeam platform 7 on driving top (or other suitable position can), magnechuck circuit elements device control cabinet 11 is then adorned on the next door, convenient good wiring.Because that install additional is the isolating transformer T2 of 1:1, that is to say that the thickness in the coil turn of its primary and secondary and line footpath all equates; Secondary discord ground links to each other, and isolates the three phase mains of system transformer, neutral conductor N (zero line) with the earth 4, and secondary voltage does not change.Magnechuck mainly is a solenoid, and it is that three phase mains (two power supplys are also arranged) is a direct current through diode rectification, supplies with magnechuck work; During use; If appearring in a point place of magnechuck L, insulation reduces or one point earth (body contact); The neutral conductor N (zero line) of hull current I that is produced and system transformer T1 does not constitute the loop; Just can not produce short circuit current, when the cart 2 mechanical bearings wheel G of motor bearings wheel M, driving rolls and track 3 contact positions can not cause arcing or spark yet.After having added isolating transformer T2, insulation reduces or the magnechuck L of one point earth also can for a long time safe and reliable use, and motor bearings wheel M, mechanical bearing are taken turns G and also played a protective role, and has protected staff's safety simultaneously.

Method of operating is: under being used of driving and other machinery, and the G isolating switch, QF plastic casing breaker closing, power supply is through isolating transformer T2, and passing through FU1-3 fuse again is direct current to the V1-3 diode rectification; When needing magnechuck L work; As long as closed the K gauge tap, the KM coil gets electric, and KM main contacts closed electromagnetic sucker gets the electrician and does; Break off the K gauge tap; L magnechuck dead electricity quits work, and the inductive current of this moment is just through diode V4 and resistance R and magnetic-disc coil L formation demagnetization loop.

Utilize the secondary discord of isolating transformer ground to link to each other; Voltage does not change this principle; Being used with magnechuck L in the isolating transformer T2 of 1:1 string and the major loop; Utilize the secondary discord of isolating transformer ground to link to each other, voltage does not change this principle, solves magnechuck deficiency at work; (link to each other during phenomenon problems such as the appearance insulation is not enough, ground connection because of the secondary discord of isolating transformer ground; When ground connection occurring and the earth do not constitute the loop); Also can be normally, use for a long time; Motor bearings, mechanical bearing and the staff's of magnechuck and rolling personal safety has also been protected in better guarantee running in proper working order.As long as according to the power of magnechuck, select suitable 1:1 isolating transformer T2 (power must greater than the power of magnechuck) just can make the use of the magnechuck L safety and reliability of insulate reduction or one point earth.

If do not add isolating transformer: when in operating room 8, manipulating driving 1 magnechuck with reference to Fig. 2; If the low or one point earth (body contact) of insulation appears in magnechuck coil L at a point place; Hull current I will up walk to steel wire rope 5 in face of the direction of dotted line 9, to motor bearings wheel M, the mechanical bearing wheel G place of driving dolly 6 or driving cart 2; The neutral dotted line N of electric current I and system transformer T1 forms short circuit, and magnechuck coil L heating is burnt out, and the time that the maintenance return-to-factory needs is long, buys new concentration of expensive; As long as the motor bearings of dolly 6 or cart 2 wheel M, mechanical bearing wheel G are along track 3 rollings (work); Will produce short circuit current at the neutral dotted line N of transfer point b place and system transformer T1; Cause arcing or spark, time length will burn out motor bearings M, mechanical bearing G, to staff's also not guarantee of personal safety; Can not use, most importantly influence work and personal safety problem.

The present technique beneficial effect is: simple to operate, equipment is simple, and is easy for installation, easy to maintenance; Safe and reliable, equipment is oversimplified, improve the equipment operating efficiency; Reduce the magnechuck fault, thereby protected motor bearings, the mechanical bearing of magnechuck and rolling; The purpose that guarantees safe production, protection staff's personal safety.

Claims

1. the magnechuck circuit of a safety; It is characterized in that transformer T1 and between major loop fuse F U1-3 in the magnechuck circuit are serially connected with isolating transformer T2 through isolating switch SQ, circuit breaker Q F, and isolating transformer T2 is identical with each item technical parameter of system transformer T1.

2. a kind of safe magnechuck circuit according to claim 1 is characterized in that coil turn and the thickness in line footpath of the primary and secondary of the transformer T1 in isolating transformer T2 and the magnechuck circuit equates the matching structure of formation 1:1.

3. a kind of safe magnechuck circuit according to claim 1 is characterized in that at major loop fuse F U1-3 to being connected with the rectification circuit that commutation diode V1-3 constitutes through A.C. contactor KM between magnechuck coil L.

4. a kind of safe magnechuck circuit according to claim 1 is characterized in that in the loop of magnechuck coil L and A.C. contactor KM, also being serially connected with the power-off protecting circuit of the magnechuck coil L that fly-wheel diode V4 and continued flow resistance R constitute.