CN2212579Y - Electromagnet contactless controller for lifting - Google Patents

Abstract

The utility model relates to a lifting electromagnet contactless controller which is composed of an exciting loop, a demagnetizing loop, a follow current loop and a discharging loop which adopt the method of the two-phase half-wave rectification. A contactless thyristor is utilized to replace a contactor with a contact. The utility model decreases electric elements, reduces the manufacture cost, improves the service life greatly and decreases the volume and the weight of the device simultaneously.

Description

Electromagnet contactless controller for lifting

The utility model relates to a kind of lifting electromagnet non-contact controlling device.

At present the lifting electromagnet control setup that uses partly is made up of the control circuit that alternating current changes galvanic rectifier power source partial sum control direct current (DC) break-make into substantially.Rectifier power source has two kinds of patterns, and a kind of is to adopt voltage transformer step-down, bridge rectifier mode, and shortcoming is that volume is big, equipment heavy, and used no device is more, the manufacturing cost height.Another kind is to adopt two half-wave bridge rectifier circuits, is characterized in that volume is little, in light weight, and big inductive load is had better practicability.The control circuit part then is to adopt the contact circuit that has of relay and contactor control to constitute.Owing to adopt relay and contactor control that the contact is arranged, make its reliability lower, and service life is short, need often to change contactless switch, thereby increased use cost.

The purpose of this utility model provides a kind of lifting electromagnet non-contact control circuit.

The utility model is by adopting controlled thyristor to replace uncontrollable rectifier diode, is direct current (DC) with AC rectification, utilizes the controllability of thyristor to realize its conducting simultaneously and ends.Its effect is identical with the closed and disconnected of contactless switch.

Accompanying drawing 1 is the electrical schematic diagram of lifting electromagnet non-contact controlling device.

Describe the utility model in detail below in conjunction with accompanying drawing.

The utility model is by energizing loop, and degaussing loop and afterflow, discharge loop adopt the mode of two phase half-wave rectifications to constitute.Thyristor KP ₁And KP ₃Anode connect three-phase alternating-current supply respectively appoint two-phase 5 and 6, KP ₁And KP ₃Negative electrode receive an end 8 of electromagnet C winding, KP jointly ₁Gate pole and negative electrode receive binary pair KG respectively ₁3 and 4 ends, KP ₃Gate pole and negative electrode receive binary pair KG respectively ₂3 ' and 4 ' end, another 7 connections mutually of the other end 10 of electromagnet C winding and three-phase alternating-current supply, formation energizing loop; Thyristor KP ₂Anode and current-limiting resistance R ₁Receive 8 ends after the series connection, KP ₂Negative electrode and KP ₁Anode link KP ₂Gate pole and negative electrode receive KG respectively ₁1 and 2 ends, thereby constitute the degaussing loop; Discharging resistance R ₂With 8 and 10 two ends that are connected in parallel on electromagnet C winding after flywheel diode ZP connects, at R ₂The open contact of 8 and 11 a two ends control contactor JC in parallel, at the normally closed contact of 11 and 10 two ends of ZP JC in parallel, the continuous current circuit of the open contact of JC and ZP composition electromagnet C.R ₂, ZP and contactless switch normally closed contact form discharge loop.

When requiring big degaussing voltage, between 6,9 two ends, increase by a thyristor KP ₄, KP ₄Anode and KP ₂Anode link KP ₄Negative electrode respectively with KP ₃Anode and KG ₂2 ' end link KP ₄Gate pole receive KG ₂1 ' end, thereby make entire circuit quicken degaussing.

The principle of work of lifting electromagnet non-contact controlling device.

The three-phase alternating-current supply of 380V is received on the control setup, when excitatory, binary pair KG ₁And KG ₂Send signal, make thyristor KP ₁And KP ₃Be subjected to the forward voltage effect and unidirectional conducting, KP ₂And KP ₄Then end, the normally closed contact of contactless switch JC disconnects, the open contact closure.Work as KP ₁And KP ₃Naturally turn-off when bearing reverse voltage, inductive load electromagnet C afterflow by the open contact discharge of the contactless switch JC of diode ZP and closure state, electric current is continuous in the maintenance electromagnet, finishes once excitatory circulation.In whole excitatory process, electromagnet or bear KP ₁And KP ₃Forward voltage, or by ZP and closed JC open contact afterflow, the electric current that keeps electromagnet to pass through flows to 10 ends from 8 ends, makes electromagnet by the excitatory load that picks up.During unloading, binary pair KG ₁And KG ₂Make KP ₁And KP ₃Lose gate voltage, utilize the reverse voltage that exchanges, make KP ₁And KP ₃Naturally turn-off, the normally closed contact closure of contactless switch JC, open contact disconnect, and electromagnet is by flywheel diode ZP and discharging resistance R ₂Discharge, meanwhile, KP ₂And KP ₄The conducting that is triggered makes the electromagnet two ends add that reverse voltage carries out degaussing, when remanent magnetism reduces to extremely weak, unloads load.KP then ₂And KP ₄Also lose gate voltage, the reverse voltage that utilize to exchange and shutoff naturally, the degaussing electric energy in the electromagnet passes through R again ₂Put with the normally closed contact of JC.So far finish a working cycle process.

The utility model has the advantages that: utilize the characteristic of IGCT that DC power supply apparatus and the control device of the lifting electromagnet of present use are organically combined, both realized that alternating current changed galvanic effect into, realize again control work of electromagnet whether purpose, but also realized contactless control. Replace the contactor that the contact is arranged with contactless IGCT, not only reduced electric no part, reduced manufacturing cost, also greatly improved service life, also reduced simultaneously the volume and weight of equipment, compare with control cabinet with former lifting electromagnet rectifier device, volume be its 1/3rd, weight be its 1/5th. Easy to install, easy to maintenance, reduced the use cost of equipment.

Claims (2)

1, a kind of lifting electromagnet non-contact controlling device is to adopt the mode of two phase half-wave rectifications to constitute by energizing loop, degaussing loop and afterflow, discharge loop, it is characterized in that:

Thyristor KP ₁And KP ₃Anode connect three-phase alternating-current supply respectively appoint two-phase 5 and 6, KP ₁And KP ₃Negative electrode receive an end 8 of electromagnet C winding, KP jointly ₁Gate pole and negative electrode receive binary pair KG respectively ₁3 and 4 ends, KP ₃Gate pole and negative electrode receive binary pair KG respectively ₂3 ' and 4 ' end, another 7 connections mutually of the other end 10 of electromagnet C winding and three-phase alternating-current supply, formation energizing loop; Thyristor KP ₂Anode and current-limiting resistance R ₁Receive 8 ends after the series connection, KP ₂Negative electrode and KP ₁Anode link KP ₂Gate pole and negative electrode receive KG respectively ₁1 and 2 ends, thereby constitute the degaussing loop; Discharging resistance R ₂With 8 and 10 two ends that are connected in parallel on electromagnet C winding after flywheel diode ZP connects, at R ₂The open contact of 8 and 11 a two ends control contactor JC in parallel, at the normally closed contact of 11 and 10 two ends of ZP JC in parallel, the continuous current circuit of the open contact of JC and ZP composition electromagnet C, R ₂, ZP and contactless switch JC normally closed contact form discharge loop.

2, lifting electromagnet non-contact controlling device according to claim 1 is characterized in that increasing by a thyristor KP between 6,9 two ends when requiring big degaussing voltage ₄, KP ₄Anode and KP ₂Anode link KP ₄Negative electrode respectively with KP ₃Anode and KG ₂2 ' end link KP ₄Gate pole receive KG ₂1 ' end.

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