CN2483367Y - Non-contact control device for starting electromagnet - Google Patents

Abstract

The utility model relates to a lifting electromagnet control device without contact. The technical features of the utility model are that: a dc contactor is replaced by a SCR, and the SCR adopts auto-trigger type, which makes the line simple, installation and maintenance convenient, working safely and reliable; utilizing ac to demagnetize makes demagnetization and breaking magnet fast; during the whole process from excitation to demagnetization, one SCR is made in conducting state all the time, the overvoltage produced by electromagnet can be reduced to one half, discharging resistance can be properly increased, which makes demagnetization speed accelerated further; getting rid of the contactor large current contact in parallel connected with a diode in discharge circuit realizes contactless in real sense.

Description

The lifting electromagnet non-contact controlling device

The utility model relates to a kind of lifting electromagnet control setup, particularly a kind of lifting electromagnet non-contact controlling device of being made up of silicon control.

The lifting electromagnet non-contact controlling device that generally uses all is to be direct current (DC) with AC rectification earlier at present, for electromagnet provides working power, controls the excitatory and reverse degaussing of forward of electromagnet with the contact of DC contactor; And be provided with the electromagnet discharge loop that is composed in series with discharging resistance again by after rectifier diode and the parallel connection of the excitatory DC contactor normally closed interlock of forward, the effect of this normally closed interlock is that the remanent magnetism for the reverse degaussing of electromagnet provides discharge loop, but closure is the instantaneous large-current that flows through in the discharge loop in the real work, the frequent scaling loss of this normally closed interlock.Because magnet coil is big inductive load, in the switching process of and oppositely degaussing excitatory, produce over voltage during the power supply micro breaks, make that the normally open contact arcing of DC contactor is long to cause frequent scaling loss at forward, maintenance load increases, and the magnet coil insulation is damaged.In order to limit this over voltage, discharging resistance can not select greatly, and the restriction of resistance makes degaussing speed cross influence loading and unloading slowly.

For addressing these problems, common way is to utilize silicon control to replace DC contactor.Chinese patent ZL91217702.0 proposes to replace with four silicon controls the scheme of four normally open contacts of forward and reverse DC contactor; Chinese patent ZL94232081.6 proposes to replace four normally open contacts of forward and reverse DC contactor to replace the scheme of power rectifier diode again with four silicon controls; Make the performance of device obviously be better than original control setup, but still exist forward excitatory in reverse degaussing switching process the power supply discontinuous problem, the big electric current normally closed interlock of the DC contactor of original discharge loop still keeps, and the little problem of discharging resistance still is not resolved, easily produce over voltage in the former control setup so still exist, the frequent scaling loss of DC contactor, the slow shortcoming of loading and unloading.Owing to remain with big electric current normally closed interlock, really realized contact pointless control so can not say so.

The purpose of this utility model be to provide a kind of and can make that the electromagnet suction is many, blowing is fast, produce the lifting electromagnet non-contact controlling device that over voltage is low, circuit is simple, installation and maintenance are convenient, safe and reliable.

The purpose of this utility model is achieved in that the excitatory silicon control that utilizes of electromagnet forward not only replaces rectifier diode but also replace DC contactor, and a silicon control in parallel is done afterflow usefulness at the magnet coil two ends; Oppositely degaussing then utilizes Group of Silicon Controlled Rectifier to become alternating-current switch to feed the method for alternating current to electromagnet, the hold concurrently forward silicon control of alternating-current switch of the silicon control that a commutating phase is wherein used, and make this silicon control in the whole process of reverse degaussing, be in conducting state in that forward is excitatory always, solved the excitatory problem that power supply is interrupted in reverse degaussing switching process of forward; Activation patterns is voluntarily adopted in silicon controlled control, and it is very simple and reliable to make it trigger circuit, and its action is all carried out according to setting program.

Description of drawings:

Accompanying drawing 1 is a lifting electromagnet non-contact controlling device embodiment electrical schematic diagram.

The lifting electromagnet non-contact controlling device of present embodiment is made up of the excitatory silicon-controlled rectifying switch circuit of forward, reverse degaussing SCR AC switch circuit, discharge circuit, programming control trigger circuit.The excitatory silicon-controlled rectifying switch circuit of forward is by two forward silicon control KG ₁, KG ₂With an afterflow silicon control KG ₄Form; Oppositely degaussing SCR AC switch circuit is by a reverse silicon control KG ₃With a forward silicon control KG ₂Reverse parallel connection, KG ₂For the excitatory silicon-controlled rectifying switch circuit of forward with oppositely degaussing SCR AC switch circuit is shared; Discharge loop is composed in series by a rectifier diode Z and a discharging resistance FR; The programming control trigger circuit are by a supply transformer B, a double-throw two pole switch K, three intermediate relay J ₁, J ₂, J ₃Form with a time relay sj.

It is novel to describe this use below in conjunction with accompanying drawing in detail by embodiment.

In an embodiment, the excitatory silicon-controlled rectifying switch circuit of forward directly with 380 volts of power supply power supplies of three-phase alternating current, adopts two-phase formula silicon controlled rectifier, silicon control KG ₁With silicon control KG ₂Anode connect three-phase alternating-current supply respectively B mutually with A mutually, negative electrode connects together and is connected to the end of magnet coil QZ, the C phase of another termination source of AC of QZ, afterflow silicon control KG ₄Be connected in parallel on the QZ two ends, wherein negative electrode and KG ₁, KG ₂Negative electrode link to each other.Silicon control KG ₁Anode meet diode Z ₁Anode, Z ₁Negative electrode receive relay J ₁Normal opened contact J _1-1An end, J _1-1Another termination KG ₁The control utmost point; Silicon control KG ₂Anode meet diode Z ₂Anode, Z ₂Negative electrode receive relay J ₂Normal opened contact J _2-1An end, J _2-1Another termination KG ₂The control utmost point; Silicon control KG ₄Anode meet diode Z ₄Anode, Z ₄Negative electrode receive relay J ₁Normal opened contact J _1-4An end, J _1-4Another termination KG ₄The control utmost point.In the reverse degaussing SCR AC switch circuit, silicon control KG ₃With silicon control KG ₂Reverse parallel connection connects, silicon control KG ₃Anode meet diode Z ₃Anode, Z ₃Negative electrode receive relay J ₂Normal opened contact J _2-3An end, J _2-3Another relay termination J ₃Normally closed contact J _3-5An end, J _3-5Another termination KG ₃The control utmost point, diode Z ₂Negative electrode and diode Z ₃Negative electrode connect together.Be connected in parallel on electromagnet QZ two ends, the other end of discharging resistance FR and silicon control KG after the negative electrode of rectifier diode Z and the series connection of discharging resistance FR one end ₄Negative electrode link to each other the anode of Z and KG ₄The anode composition discharge circuit that connects together.Voltage transformer B becomes 220 volts of alternating current with 380 volts of alternating current, 1,2 end short circuits of K switch and and relay J ₁Normal opened contact J _1-3An end, the open circuited normally closed contact S of the time-delay of time relay sj _J-1One end connects together and inserts an end of 220 volts of source of ACs; The 3 relay termination J of K ₃Normal opened contact J _3-1An end, J _3-1Another termination J ₁Coil one end, J ₁220 volts of source of AC other ends of another termination of coil, 4 ends of K, relay J ₁Normal opened contact J _1-3The other end, relay J ₃One end of coil connects together J ₃220 volts of source of AC other ends of another termination of coil; The time-delay of time relay sj disconnects normally closed contact SJ _-1The other end and relay J ₁Normal opened contact J _1-2An end and relay J ₂Normal opened contact J _2-2An end connect together J _1-2The other end and J _2-2The other end and relay J ₂One end relay J of coil ₁Normally closed contact J _1-5An end link to each other J ₂The other end of 220 volts of source of ACs of another termination of coil, J _1-5The other end and an end of time relay sj link to each other, the other end of 220 volts of source of ACs of another termination of SJ coil is formed programming control jointly and is triggered the loop.

The working process of present embodiment:

The total power switch DK that closes is for device is sent into 380 volts of three-phase alternating-current supply wait work.When needing suction K switch is closed, 220 volts of source of ACs of voltage transformer B output are powered relay J through K ₃The energising adhesive, normally closed contact J _3-5Disconnect KG ₃The triggering loop, J _3-1Closure make J ₁The energising adhesive, normally closed contact J _1-5The electric power loop of turnoff time relay SJ; J _1-1, J _1-2, J _1-3, J _1-4Closed simultaneously, J _1-1The closed KG that connects ₁Triggering loop KG ₁Conducting, J _1-4The closed KG that connects ₄The triggering loop, KG ₄Conducting, J _1-2Closure makes J ₂The energising adhesive, J _2-1Connect KG ₂The triggering loop, KG ₂Conducting, rectifier switch circuit have vdc output, the excitatory suction of electromagnet QZ forward; Though rectifier switch output is a discontinuous pulsating dc voltage, because electromagnet QZ coil itself is a big inductive load, when electromagnet QZ both end voltage zero passage, QZ is by afterflow silicon control KG ₄Discharge makes the electric current that flows through among the QZ keep constant, so electromagnet QZ has reached the many purposes of suction.Because J _3-5Disconnect back J earlier ₁So the adhesive of could switching on is KG in the suction process ₃, KG ₁, KG ₄Not conducting simultaneously, thereby power supply A, B phase and the mutually short circuited fault of B, C can not take place.J _2-3Closure be KG ₃Conducting ready.When needing blowing, the K switch disconnection is got final product; Relay J ₁J at first cuts off the power supply _1-1, J _1-2, J _1-3, J _1-4Disconnect J _1-5Closure, J _1-1Disconnect KG ₁The triggering loop, J _1-4Disconnect KG ₄The triggering loop, J _1-2Disconnect the back because J _2-2Self-insurance, J ₂The adhesive of still switching on, KG ₂Conducting still, KG ₁, KG ₄Because of bearing reverse voltage failure-free shutoff rapidly, J _1-3Disconnection make J ₃Outage, normally closed contact J _3-5Closure is connected KG ₃Triggering loop KG ₃Conducting, the SCR AC switch circuit is sent into alternating current to electromagnet QZ, utilizes alternating current to produce counter potential in electromagnet QZ, offsets the magnetic force that direct current produces rapidly, discharge loop also can effectively assist to eliminate the magnetic force that direct current (DC) produces simultaneously, so electromagnet has reached the fast purpose of blowing.J _1-5Closure, make time relay sj energising, SJ _-1The time-delay beginning reaches schedule time SJ _-1Disconnect, make J ₂, SJ outage, J _2-1Disconnect KG ₂The triggering loop, KG ₂End J _2-3Disconnect KG ₃The triggering loop, KG ₃End, AC emagnetization finishes, and control setup recovers virgin state, waits for and working next time.

Because the utility model is excitatory in the whole process of Opposed crossing degaussing at forward, silicon control KG ₂-directly be in conducting state, excitatory and the Opposed crossing degaussing is shared by forward, thus excitatory in the degaussing switching process, the phenomenon of exciting current instantaneous interruption can not appear, because KG at this moment ₂Power path not disconnect, so the electric current that sparks that flows through in discharge loop is the former KG of flowing through ₁Electric current, this value reduces 1/2nd than original device, therefore transient overvoltage reduces by 1/2nd, can suitably strengthen the value of discharging resistance FR in view of the above, to reduce discharge time constant て, (て=L/FR, the inductance value of L---QZ), accelerate dispensing speed, also can reduce to flow through in the demagnetization process simultaneously the electric current of FR, with the depowering loss.Alternating current also has the fast characteristics of disconnected magnetic, the promptly disconnected magnetic of outage, the remanent magnetism problem that does not have reverse degaussing, so in the discharge loop with the big electric current normally closed interlock cancellation of two DC contactor extremely in parallel, thereby make lifting electromagnet non-contact controlling device of the present utility model realize that oncontacting truly reveals.

Claims (4)

1. a lifting electromagnet non-contact controlling device is made up of the excitatory silicon-controlled rectifying switch circuit of forward, reverse degaussing SCR AC switch circuit, discharge circuit, programming control trigger circuit, it is characterized in that:

The excitatory silicon-controlled rectifying switch circuit of forward is by two forward silicon control KG ₁, KG ₂Be connected into two-phase formula SCR rectification circuit and give electromagnet QZ excitatory, afterflow silicon control KG in parallel at the QZ two ends again ₄Form; Anti-phase degaussing SCR AC switch circuit is by a reverse silicon control KG ₂With a forward exciting circuit forward silicon control KG ₂Reverse parallel connection is formed, and sends into the alternating current degaussing for electromagnet QZ; Discharge circuit is composed in series by a rectifier diode Z and a discharging resistance FR; The programming control trigger circuit are by a supply transformer B, double-throw two pole switch K, three intermediate relay J ₃, J ₂, J ₃, a time relay sj form.

2. lifting electromagnet non-contact controlling device according to claim 1 is characterized in that silicon control KG ₁, KG ₂, KG ₃, KG ₄All adopt activation patterns voluntarily, KG ₁Anode meet diode Z ₁Anode, Z ₁Negative electrode succeed electrical equipment J ₁Normal opened contact J _1-1An end, J _1-1Another termination KG ₁The control utmost point; KG ₂Anode meet diode Z ₂Anode, Z ₂Negative electrode succeed electrical equipment J ₂Normal opened contact J _2-1An end, J _2-1Another termination KG ₂The control utmost point; KG ₃Anode meet diode Z ₃Anode, Z ₃Negative electrode succeed electrical equipment J ₂Normal opened contact J _2-3An end, J _2-3Another relay termination J ₃Normally closed contact J _3-5An end, J _3-5Another termination KG ₃The control utmost point; KG ₄Anode meet diode Z ₄Anode, Z ₄Negative electrode succeed electrical equipment J ₁Normal opened contact J _1-4An end, J _1-4Another termination KG ₄The control utmost point.

3. lifting electromagnet non-contact controlling device according to claim 1 is characterized in that the diode Z in the reverse degaussing SCR AC switch circuit ₂With diode Z ₃Negative electrode connect together.

4. lifting electromagnet non-contact controlling device according to claim 1 is characterized in that forward rectification thyristor KG ₂To the whole process of Opposed crossing degaussing, be in conducting state from forward is excitatory all the time.

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