CN206339107U - Furnace temperature control system is melted in a kind of electric smelting - Google Patents

Abstract

Melt furnace temperature control system the utility model discloses a kind of electric smelting, including stove door switch, solid-state relay, heater strip, thermocouple, the stationary contact of stove door switch and solid-state relay input control end connection, another input control end connection of the movable contact and solid-state relay of stove door switch, stove door switch movable contact is closed with stationary contact when fire door is closed, disconnected in oven door opening, one output end of solid-state relay is connected with mains supply, another output end of solid-state relay is connected with heater strip, the heating unit temperature that the temperature detecting unit detection heater strip of thermocouple is located at, the output end of thermocouple is connected with the main control module of electric melting furnace.Improved by circuit, need originally one or two month be accomplished by change mechanical heating furnace door switch can with long-time steady operation, save cost, add system work stability.

Description

Furnace temperature control system is melted in a kind of electric smelting

Technical field

The utility model belongs to inspection assay device control field, is related to a kind of temperature control system of electric melting furnace.

Background technology

Traditional electricity melting furnace is to control temperature program(me) by microcomputer system, completes to heat and cools, turnover sample, sample shake The processes such as dynamic stirring.Machinery heating door switch is that the maximum node of stove heat device electric current is melted in electric smelting, is also the part of most critical, is Upper lower heater is controlled respectively by two groups of contacts.Its part includes movable contact, stationary contact, compression spring, antagonistic spring. Mechanical heater switch, which is frequently switched on, causes contact to be struck sparks heat ageing, ablation, and easy loose contact, adhesion cause heater to lose Control, causes accessory damage or electric melting furnace to scrap.

Utility model content

The purpose of this utility model is to provide a kind of electric smelting and melts furnace temperature control system, efficiently solves electric smelting and melts furnace temperature Out-of-control phenomenon.

To achieve the above object, the utility model uses following technical proposals：

Furnace temperature control system, including stove door switch, solid-state relay, heater strip, thermocouple are melted in a kind of electric smelting, and fire door is opened The stationary contact of pass and solid-state relay input control end connection, the movable contact of stove door switch and solid-state relay it is another Individual input control end connection, stove door switch movable contact is closed when fire door is closed with stationary contact, disconnected in oven door opening, solid-state One output end of relay is connected with mains supply, and another output end of solid-state relay is connected with heater strip, thermocouple The heating unit temperature that is located at of temperature detecting unit detection heater strip, the output end of thermocouple and the master control mould of electric melting furnace Block is connected.

Further, the heating unit of electric melting furnace includes upper strata heater strip and lower floor's heater strip, and the temperature of thermocouple is examined The mold temperature that unit detection is located between upper strata heater strip and lower floor's heater strip is surveyed, stove door switch includes the first machinery heating and opened Pass and the second mechanical heater switch, solid-state relay include the first solid-state relay and the second solid-state relay, and the first machinery adds Input of the movable contact and stationary contact of thermal switch respectively with the first solid-state relay is connected, the output end of the first solid-state relay It is connected with upper strata heater strip；The input of the movable contact and stationary contact of second mechanical heater switch respectively with the second solid-state relay Connection, the output end of the second solid-state relay is connected with lower floor heater strip.

The beneficial effects of the utility model are,

The utility model to original electric melting furnace by carrying out track remodelling, the machinery that will be connected originally with electrical heating wire Heating furnace door switch is changed to mechanical heating furnace door switch control solid-state relay, and the heating of solid-state relay control electrical heating wire is moved Make, in the circuit after improvement, mechanical heating furnace door switch flows only through tens milliamperes of low current, it is to avoid original mechanical heating furnace Contact struck sparks heat ageing, ablation, easily contact that what door switch directly constituted that loop flows through that high current causes with heating wire cause Bad, adhesion.Originally in circuit, mechanical heating furnace door switch is broken down, and the main control module of electric melting furnace is detected without electricity Stream is flowed through, and work can be automatically stopped, in holding state.Solid-state relay is electronic switch, with fast, noiseless, the nothing of reaction The advantage of loss, is improved by circuit, need originally one or two month be accomplished by change mechanical heating furnace door switch can grow Time stable operation, saves cost, adds the stability of system work.

Brief description of the drawings

Fig. 1 be electric melting furnace track remodelling before conspectus；

Fig. 2 is conspectus after electric melting furnace track remodelling.

Embodiment

As shown in figure 1, before electric melting furnace track remodelling, the stationary contact of the first stove door switch is connected with upper strata electrical heating wire, The movable contact of first stove door switch is connected with power supply, constitutes heating circuit, stationary contact and the lower floor's electricity of the second stove door switch Heater strip is connected, and the movable contact of the second stove door switch is connected with mains supply, constitutes heating circuit, the fire door when fire door is closed Switch closure, line conduction, when door opened, stove door switch disconnects, and circuit disconnects, and stops heating, and thermocouple detection is located at upper Layer heater strip and lower floor's heater strip between mold temperature, main control module detection mold temperature, higher than setting temperature when, control Stove door switch stops heating, and during less than design temperature, master control module controls stove door switch is begun to warm up.

As shown in Fig. 2 furnace temperature control system, including the first mechanical heater switch, the second machinery heating are melted in a kind of electric smelting Switch, the first solid-state relay, the second solid-state relay, upper strata heater strip, lower floor's heater strip, thermocouple, the first machinery heating Input of the movable contact and stationary contact of switch respectively with the first solid-state relay is connected, the output end point of the first solid-state relay It is not connected with upper strata heater strip and power line；The movable contact and stationary contact of second mechanical heater switch respectively with the second solid-state relay The input connection of device, the output end of the second solid-state relay is connected with lower floor's heater strip and power line respectively, the temperature of thermocouple The mold temperature that detection unit detection is located between upper strata heater strip and lower floor's heater strip is spent, output end and the electric smelting of thermocouple are melted The main control module connection of stove.

Solid-state relay (referred to as " SSR "), is a kind of new noncontacting switch device being all made up of solid state electrical components Part, it utilizes the switching characteristic of electronic component (such as switch triode, bidirectional triode thyristor semiconductor devices), can reach contactless No-spark make-and-break contact purpose, therefore be otherwise known as " noncontacting switch ".Solid-state relay is that a kind of four end has Source device, two of which terminal is input control end, and two ends are output-controlled end in addition, and its existing amplification driving effect has again Buffer action, is well suited for driving high power switch formula executing agency.After track remodelling, mechanical heating furnace door switch control is solid In state relay, the heating action of solid-state relay control electrical heating wire, the circuit after improvement, mechanical heating furnace door switch only flows Cross tens milliamperes of low current, it is to avoid original mechanical heating furnace door switch directly flows through high current with heating wire composition loop and made Into the contact that causes struck sparks heat ageing, ablation, easy loose contact, adhesion.Originally in circuit, mechanical heating furnace door switch hair Raw failure, the main control module of electric melting furnace detects no electric current and flowed through, and work can be automatically stopped, in holding state.Solid-state Relay is electronic switch, with fast, noiseless, loss-free advantage is reacted, is improved by circuit, one or two is needed originally The mechanical heating furnace door switch for being accomplished by the moon changing can save cost with long-time steady operation, add the steady of system work It is qualitative.

It is not new to this practicality although above-mentioned embodiment of the present utility model is described with reference to accompanying drawing The limitation of type protection domain, one of ordinary skill in the art should be understood that on the basis of the technical solution of the utility model, ability Field technique personnel need not pay the various modifications that creative work can make or deform still in protection model of the present utility model Within enclosing.

Claims (2)

1. furnace temperature control system is melted in a kind of electric smelting, it is characterised in that including stove door switch, solid-state relay, heater strip, thermoelectricity It is even, the stationary contact of stove door switch and solid-state relay input control end connection, the movable contact of stove door switch and solid-state after Another input control end connection of electrical equipment, stove door switch movable contact is closed with stationary contact when fire door is closed, in oven door opening When disconnect, an output end of solid-state relay is connected with mains supply, another output end and heater strip of solid-state relay Connection, the temperature detecting unit of thermocouple detects the heating unit temperature that heater strip is located at, the output end of thermocouple and electric smelting Melt the main control module connection of stove.

2. furnace temperature control system is melted in a kind of electric smelting as claimed in claim 1, it is characterised in that the heating unit of electric melting furnace Including upper strata heater strip and lower floor's heater strip, the temperature detecting unit detection of thermocouple is located at upper strata heater strip and lower floor's heater strip Between mold temperature, stove door switch includes the first mechanical heater switch and the second mechanical heater switch, and solid-state relay includes First solid-state relay and the second solid-state relay, the movable contact and stationary contact of the first mechanical heater switch respectively with the first solid-state The input connection of relay, the output end of the first solid-state relay is connected with upper strata heater strip；Second mechanical heater switch The input of movable contact and stationary contact respectively with the second solid-state relay is connected, and output end and the lower floor of the second solid-state relay add Heated filament is connected.