CN2031503U - Double chamber heating furnace for forging with pre-heating and heating alternative circulating function - Google Patents

Abstract

The utility model provides a double chamber heating furnace for forging with preheating and heating alternative circulating function. The utility model can solve the continuous production of heating the middle and small batch forging stocks. The utility model integrates two whole ball-shaped heating chambers into a whole and also comprises a burning chamber, a gate valve, an air distributor, a heat exchanger and a flue. The utility model can heat the stock not only by alternative preheating and heating with two chambers but also by high temperature heating with two chambers at the same time, so the utility model is an ideal device for saving energy and high efficiently forging and heating.

Description

Double chamber heating furnace for forging with pre-heating and heating alternative circulating function

The utility model relates to a kind of forge furnace, is in a kind of being applicable to, small lot carbon steel and alloy steel forging blank heating, reaches the novel Forging Heat Equipment of continuous production and high thermal efficiency.

At present, forge furnace can be divided into cell-type discontinuous and continous way two big classes by nature of production both at home and abroad.In, the heating of the forging of small lot all adopts cell-type discontinuous heating furnace, the cold burden of promptly periodically in stove, packing into, through in warm preheating---high temperature heating, the forging of coming out of the stove one by one then.The thermal efficiency of this heating furnace is very low, generally only reaches 10～20%.And the design thermal efficiency of this kind forge furnace is 28%.Simultaneously, because the discontinuous production of heating furnace must make forging equipment also be in the discontinuous production status, reduced the rate of starting of forging equipment.And continuous-type furnace is to push cold burden from an end continuously, automatically come out of the stove for forging and pressing from the other end of stove, though can make full use of the energy, the higher thermal efficiency is arranged, can produce continuously, but only be applicable to the heating of the forge piece blank reheating in enormous quantities of same specification, as bearing, automobile industry etc., for in the single-piece, small lot forge piece blank reheating heating, can't adopt this heating furnace.

The purpose of this utility model is to provide a kind of improved heating furnace at the deficiency of prior art, and it has high thermal efficiency, in realizing, the continuous alternate cycles heating of small lot carbon steel and alloy steel forging blank.

Task of the present utility model is finished as follows: the preheating of two chambers---and heating alternate cycles forge furnace is made up of body of heater and the fuel feeding that communicates with the body of heater heating clamber, air feed and the smoke evacuation system of heating forge piece blank reheating, body of heater by two sizes identical and communicate can realize preheating---heating sphere or rectangle heating clamber alternately joins together, body of heater is a five-layer structure, inwall is an aluminum phosphate matter precast block housing, the middle level is the sial insulation quilt, skin is an insulating brick, and outermost layer is asbestos board and outer cover of steel plate.Upper of furnace body is furnished with two cover bridge shape flues, the through type efflux heat-exchanger top that has the slidingtype expansion joint links to each other with the air slide valve with three kinds of intake adit positions with bridge shape flue, the bottom communicates with the underground flue that Flue valve is housed, burner and air slide valve that delivery valve is housed join, and are installed in the burner passage port of heating clamber.Two heating clambers are respectively equipped with burner port separately, and exhaust opening has the main channel between two Room, is provided with recirculation line between the two burner ports.

When entering duty, two heating clambers can be alternately as low, middle temperature preheating of blank or high temperature heating, when management system during for a Room fuel feeding wherein, air feed burning, the discharge flue of this chamber is closed, close fuel feeding, the air feed system of another chamber simultaneously, open this chamber discharge flue, each gate valve opens and closes extent control makes last chamber be in the pressurized firing state, one Room, back is in little negative pressure smoke evacuation state, so just formed of the high temperature heating of last chamber to blank, one Room, back utilizes from the next burner gas residual heat of last chamber stream carries out cold blank, low-temperature prewarming.When last indoor blank reaches forging temperature, come out of the stove one by one, another batch cold burden of promptly packing into after finishing, and change management system, can carry out the high temperature heating to a back Room blank of preheating, and the last chamber of the cold blank of packing into has just become preheating chamber, thereby realizes preheating---the continuous production that heat cycles replaces.Alternate cycles heating furnace design thermal efficiency is 33%, and the actual measurement thermal efficiency reaches 30%.Because the continuous supplying blank of heating furnace makes the rate of starting of forging equipment improve 35%, obtains good economic effect.

Below in conjunction with accompanying drawing the utility model is carried out concrete description.

Fig. 1 is the cutaway view of a kind of concrete structure of the utility model.

Fig. 2 is the cutaway view of Fig. 1 along the A-A line.

Fig. 3 is the cutaway view of Fig. 2 along the B-B line.

Fig. 4 is that K among Fig. 2 is to view.

Fig. 5～7th, fundamental diagram of the present utility model.

With reference to Fig. 1～7, describe concrete structure of the present utility model in detail.The port of burner separately in two heating clambers 1 of this stove and 2 is separately installed with burner 3 and 4, by gate valve 5 and 6 control fuel feeding, and air slide valve 17 control air feeds.Bridge- type flue 9 and 10 are arranged at two fire doors 7 and 8 top, and furnace gas leads to underground flue 13 and 14 after by heat exchanger 11 and 12, and smoke evacuation program and size are to be controlled by mechanical flue valve 15 and 16.Flame furnace gas main channel 18 is arranged between two Room, the burner passage port of two Room has recirculation line 19, high-temperature furnace gas in the heating clamber can enter in the preheating chamber by main channel 18, and the part low temperature furnace gas in the preheating chamber can be inhaled into heating clamber by recirculation line 19, play the preceding too high effect of furnace temperature of burner of adjusting, the life-span of having improved burner hearth.The structure of body of heater is, inwall is an aluminum phosphate matter precast block hemispherical shell 20, and the middle level is an alumina silicate insulation quilt 21, and skin is an insulating brick 22, and outermost layer is asbestos board 23 and sealing outer cover of steel plate 24.This body of heater has high radiation and convection, heat-transfer intensity, and overflow gas, heat loss of its heat radiation, accumulation of heat, furnace wall is all very little, the intensity height, and the life-span is long.

According to the specification switch of heating blank, two heating clambers can be designed to rectangle, also can be designed to sphere.As adopt smoke evacuation, then heat exchanger 11 and 12 can be installed in door upper part, at this moment, the dish-shaped gate valve that flue shutter adopts heat resisting steel to make.

When heating clamber 1 heats as high temperature, heating clamber 2 as in, at this moment (see figure 5) opens gate valve 5 during low-temperature prewarming, closing gate valve 6, make fuel oil flow to burner 3, air slide valve 17 forwards the cold air that air blast is sent here to and leads to and lead to burner 3 after heat exchanger 12 is heated to 250 °～350 ° by fume afterheat, fuel-oil atmozation and burning formation thermal-flame are sprayed into heating clamber 1, and heating clamber 1 promptly is in the high temperature heated condition.Flame furnace gas heat enters heating clamber 2 along main stem 18 between two Room after being absorbed a part by blank, and blank is carried out preheating, during heating clamber 2 promptly is in, the low-temperature prewarming state.The heat of furnace gas is absorbed by blank once more in Room 2, forms 750～1000 ℃ flue gas, to heat exchanger 12, air is carried out preheating by fire door 8 top bridge shape flues 10 rows.At this moment flue-gas temperature drops to 400～500 ℃, and via the logical gate 16 of the cigarette of opening, underground flue 14 rows are discharged in the air to chimney.And in the Room 2 sub-fraction in the furnace gas of lower temperature via recirculation line 19 burned devices before high velocity air suck Room 1, the preceding too high phenomenon of temperature of the burner of can adjusting like this, also made full use of simultaneously the energy, cigarette gate 15 is in closed condition in this process, and the thermal-flame in the Room 1 can not be discharged from bridge shape flue 9 and underground flue 13.

When heating clamber 2 is done the high temperature heating, during heating clamber 1 is done, low-temperature prewarming (Fig. 6), open gate valve 6 this moment, gate valve 5 is closed, flue valve 15 is opened, 16 close, rotary air distributing valve 17 is to making cold air lead to the position of burner 4 through heat exchanger 11, at this moment burner 4 work, make heating clamber 2 be in the high temperature heated condition, the flame furnace gas enters Room 1 by Room 2, and during Room 1 is in, the low-temperature prewarming state, flue gas is discharged through heat exchanger 11, underground flue 13 and gate 15 by fire door 7 top bridge shape flues 9.Whole preheating---alternate cycles has taken place in heating schedule, promptly soon the preheated charge in the former Room 2 is heated to forging temperature, and the blank of packing into after in the Room 1 is carried out preheating, has so just reached the purpose that alternately heats blank continuously.

When two chambers all are used as high-temperature heater (Fig. 7), then gate valve 5,6 to be opened simultaneously, flue valve is opened air slide valve simultaneously and is gone to 11,12, two burners 4,5 of two heat exchangers, simultaneously duty.At this moment, two chambers all are in the high temperature heated condition, and this situation is when the big blank of heating, in two Room preheatings---and adopt two chambers high temperature heating simultaneously of a period of time in the heating alternation procedure, can shorten the heat time heating time of blank, guarantee production continuously.

Claims (3)

1, a kind of pair of chamber preheating--heating alternate cycles forge furnace, by the body of heater of heating forge piece blank reheating and the fuel feeding that communicates with the body of heater heating clamber, air feed and smoke evacuation system are formed, it is characterized in that, body of heater is to realize preheating--heating two sizes heating clamber identical and that communicate alternately joins together, upper of furnace body is furnished with two cover bridge shape flues, the through type efflux heat-exchanger top that has the slidingtype expansion joint links to each other with the air slide valve with three kinds of intake adit positions with bridge shape flue, the bottom communicates with the underground flue that flue valve is housed, burner and air slide valve that the fuel feeding gate valve is housed join, and are installed in the burner passage port of heating clamber.

2, forge furnace according to claim 1 is characterized in that, two heating clambers are respectively equipped with burner port, exhaust opening separately, between two Room the main channel are arranged, and are provided with recirculation line between the two burner ports.

3, forge furnace according to claim 1 is characterized in that, heating clamber is sphere or rectangle, body of heater is a five-layer structure, inwall aluminum phosphate matter precast block housing, and the middle level is the alumina silicate insulation quilt, skin is an insulating brick, and outermost layer is asbestos board and outer cover of steel plate.

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