CN1075438A - A kind of continuous-heating furnace for forging - Google Patents

Abstract

The invention belongs to the fixed heating furnace of the mobile furnace charge of a kind of machinery, particularly a kind of continuous-heating furnace for forging, mainly solved the heating furnace of prior art, production capacity immobilizes, coal consumption height, the thermal efficiency are low, blackness in the flue gas, flue dust is high and be not suitable for the shortcoming of continuous heating plurality of specifications furnace charge, major technique is characterised in that, is respectively equipped with movable chokes wall at the body of heater bringing-up section and the preheating section of heating furnace.Change structure in the stove by regulating the chokes wall, change the length and width ratio between bringing-up section, preheating section and the stove tail expansion segment, with adopt rectangular preiection and height arch ring in bringing-up section, improve the thermal efficiency, reduce smoke pollution etc., the present invention has nominal production capacity in a big way adjusting is arranged, and can heat the various sizes furnace charge continuously, advantages such as coal consumption is few, and the thermal efficiency height of stove and smoke pollution are few.

Description

A kind of continuous-heating furnace for forging

The invention belongs to the fixed heating furnace of the mobile furnace charge of a kind of machinery, particularly a kind of continuous-heating furnace for forging.

The continuous furnace that prior art is used, after body of heater formed, the nominal production capacity of heating furnace was fixing, and the furnace charge specification of heating is had certain restriction, in producing, need, production capacity is bigger variation along with use has, and the furnace charge specification of heating is more, and when needing to produce continuously, as when cooperating wedge straight-bar machines unit to use, prior art just can not satisfy the use needs, and prior art also exists coal consumption height, the thermal efficiency low, shortcomings such as smoke pollution is serious, operator's labour intensity height.

The objective of the invention is to design a kind of production capacity can adjust within the specific limits with actual production, and can be adapted to the needs that plurality of specifications heats furnace charge, the continuous furnace that coal consumption is few, the thermal efficiency is high, smoke pollution is little, operating machine degree is high, to overcome the deficiencies in the prior art, satisfy and produce needs.

The object of the present invention is achieved like this, heating furnace is by the body of heater of heating furnace, the combustion chamber, discharging opening, flue and feeding pusher constitute, the body of heater of heating furnace is by bringing-up section, preheating section and stove tail expansion segment are formed, in the body of heater bringing-up section of heating furnace and preheating section, be respectively equipped with and go up, preceding chokes wall that sagging translation is moving and back chokes wall, the body of heater width of heating furnace, adopt the width of the width of bringing-up section greater than preheating section, the body of heater stove tail expansion segment of heating furnace adopts length short, the structure that width is big, the length of expansion segment is below percent 8.5 of bringing-up section and preheating section total length, and self length-width ratio of expansion segment is 1: 3-1: 5.

Present invention is described below in conjunction with accompanying drawing.

Accompanying drawing 1 is principal section structural representation of the present invention.

Accompanying drawing 2 is the present invention's cross-sectional view of bowing.

Accompanying drawing 3, accompanying drawing 4, accompanying drawing 5 are the cutaway view of accompanying drawing 1, partial schematic diagram and partial enlarged drawing.

Referring to accompanying drawing, for steel rolling, forge, the continuous furnace that cross wedge rolling unit etc. use, the body of heater bringing-up section of heating furnace and the length of preheating section ratio and furnace height are poor, be two most critical structural parameters of decision heating furnace thermal technology feature, it depends on the thermal regulation of heating furnace, (temperature, pressure and heating system), and the thermal regulation of heating furnace, be again to work out according to the requirement and the thermal source condition of the heat processing technique of metal, continuous furnace of the prior art, after heating furnace forms, some parameters promptly become changeless, theory and practice proves, heating furnace is worked under nominal production capacity, unit consumption is minimum, no matter heating furnace is to decide to work under the production capacity being higher than nominal production capacity or being lower than, all be uneconomical or irrational and the latter is even more important, change and kind for satisfying output, the needs of production of many specifications, bring into play the service efficiency of heating furnace to greatest extent, the present invention has increased and can go up in the body of heater bringing-up section 1 of heating furnace, the preceding chokes wall 8 that sagging translation is moving, scientific and reasonable solution the nominal production capacity of heating furnace, can be with actual production, adjust variation issue within the specific limits, the setting and the operation principle of preceding chokes wall 8 are as follows, at first according to the scope of heating furnace needs production capacity, increase the length of bringing-up section 1, shorten the same length of preheating section 2 simultaneously, preceding chokes wall 8 promptly is arranged on about the extension position that bringing-up section 1 increases.When needs improve the nominal production capacity of heating furnace, the height of chokes wall 8 before only needing to improve, just can strengthen the length ratio of bringing-up section 1 and preheating section 2, increase the heat capacity of heating furnace simultaneously, when needs reduce the nominal production capacity of heating furnace, the height of chokes wall 8 before only needing to reduce, just can dwindle the length ratio of bringing-up section 1, reduce the heat capacity of heating furnace simultaneously, in flow-disturbing wall 8 height, bringing-up section 1 is also adjusted to a certain extent with the furnace height difference of preheating section 2 before adjusting, can guarantee like this that heating furnace cheats to remain under the specified production capacity eventually within the specific limits to work, and make unit consumption minimum, reduce production costs.

The body of heater stove tail expansion segment of continuous furnace, just for enlarging the airflow area, reduce air velocity, make the easy break-in of air-flow and do not emerge from steel import, the area of stove tail expansion segment is to determine according to the air-flow velocity of flue gas, for enlarging the area of expansion segment, prior art mainly is that the length of taking to increase the stove rear realizes, owing to air-flow and flue gas are always sought short circuit and are gone, increased the length of stove tail expansion segment, so adverse consequences that prior art can cause the effective heated length of heating furnace to shorten, for solving the problems of the technologies described above, the body of heater expansion segment 3 of heating furnace of the present invention adopts the width that increases expansion segment 3, the technical measures of the length of suitable shortening expansion segment 3 and the thickness of attenuate stove tail end wall 13, realize the expansion effect of expansion segment 3, the length of general expansion segment 3 accounts for below percent 8.5 of bringing-up section 1 and preheating section 2 total lengths, and self length-width ratio of expansion segment 3 is 1: 3-1: 4 effects are more satisfactory.For after solving expansion segment 3 length and dwindling, air-flow, flue gas has little time reduction of speed and directly goes out charging aperture 6, charging aperture 6 operating conditions are worsened, afterbody being provided with at preheating section 2 can be gone up, the back chokes wall 7 that sagging translation is moving, smoldering with regard to good solution charging aperture 6 like this makes expansion segment 3 become the problem of invalid bringing-up section with the cold air suck-back, back chokes wall 7 operation principles are as follows, utilize the Throttle Principle in the hydrodynamics, the kinetic energy and the pressure loss of air-flow are fallen, when air-flow warp chokes wall 7 later, sudden contraction, expansion again then, make air-flow after warp chokes wall 7 later, form " dovetail " shape, and enter expansion segment 3, adjust the height of chokes wall 7, the pressure that can guarantee charging aperture 6 places is zero-pressure, make the i.e. suck-back cold air not of charging aperture 6, the flue gas of also can not emerging, back chokes wall 7 can and be produced needs and regulate according to different environment, preceding chokes wall 8 and back chokes wall 7, all be to adopt the steel fibre castable refractory to water tears to form, and save cooling water pipe, for not taking the body of heater effective width of heating furnace, before chokes wall 8 and back chokes wall 7 respectively with the side wall groove 14 of bringing-up section 1, the side wall of preheating section 2 recessed 15 connects.

According to thermal technology's theory, the bringing-up section of continuous furnace, the main radiant heat transfer that relies on, and pre-section 2 mainly is to rely on convection heat transfer' heat-transfer by convection, strengthen the bulk of bringing-up section, can reduce the flow velocity that flame passes through, prolong the big flame radiant heat transfer time, improve the rate of leaving over of bringing-up section heat, improve the thermal efficiency of heating furnace, prior art mainly is that employing bringing-up section and preheating section are wide, by increasing the bringing-up section height, realize strengthening the bulk of bringing-up section, the shortcoming of this way is, because thermal current all is toward the eminence drift, cause thermal current along furnace roof and mistake, the speed that thermal current passes through in bringing-up section is slow unlike preheating section, makes flame can not be full of burner hearth, furnace roof and be heated and be separated with one deck low temperature gas-bearing formation between the furnace charge reduces hot working effect.The present invention adopts the size way of widening bringing-up section 1, effectively solve flame and be full of burner hearth, make high temperature gas flow press close to be heated furnace charge, increase radiation and convection heat transfer' heat-transfer by convection, improve the purpose of the thermal efficiency of heating furnace, the width of bringing-up section 1 is widened in employing, can also be when not influencing hot working efficiency, make the thermal-flame air-flow in the hot time lengthening of analysing of bringing-up section 1, draw according to Hydrodynamics Theory, the time that prolongs is directly proportional with the recruitment of furnace width, narrow heating furnace, adopt the not wide structure technology of body of heater, effect can be good more, the side wall of bringing-up section 1 is provided with a plurality of rectangular preiections 5, with the arch ring 9 of just being separated by and arranging, the length that can be equivalent to have increased the fender area of bringing-up section 1 like this and increase bringing-up section 1, rectangular preiection 5 arch rings 9 can also make the thermal current direction constantly change, make the flue dust major part that contains in the hot gas be thrown out of and drop in the stove, reach dust removing effects, in order to satisfy the needs that plurality of specifications is heated the furnace charge heating, in bringing-up section 1, the furnace bottom of preheating section 2 and stove tail expansion segment 3 is provided with the slide rail A of band " V " type groove, also be provided with " V " type projection corresponding with slide rail A on 12 bases of cutting somebody's hair of pusher, so no matter be heated the furnace charge diameter, all can " V " type groove on slide rail A in, being cut somebody's hair by pusher 12 promotes to advance, when arriving tapping hole 10, reach required hot processing temperature.

The embodiment of the invention is through facts have proved, have following good effect and can heat the plurality of specifications furnace charge continuously, and be not subjected to concrete size restrictions, heating furnace can be adjusted nominal production capacity according to needs of production, and make the production unit consumption remain on floor level, can be stabilized in 95kg standard coal/ton product, the blackness of flue gas is low, flue dust is few, facts have proved at the outlet flue place, can reach 0.5 lingemann grade without any dust arrester blackness of exhaustion, flue dust reaches 185 milligrams/m3, furnace operation is convenient, and thermal efficiency advantages of higher is a kind of more satisfactory continuous furnace structure, can extensively use steel rolling, forge, particularly be applicable to cooperate wedge straight-bar machines group to use.

Claims (4)

1, a kind of continuous-heating furnace for forging is made of body of heater, combustion chamber, discharging opening, flue and the feeding pusher of heating furnace, and the body of heater of heating furnace is made up of bringing-up section, preheating section and stove tail expansion segment, it is characterized in that:

In the body of heater bringing-up section 1 and preheating section 2 of a, described heating furnace, be respectively equipped with can be upper and lower vertical preceding chokes wall that moves 8 and back chokes wall 7,

Body of heater bringing-up section 1 width of b, described heating furnace is greater than the width of preheating section 2,

Body of heater stove tail expansion segment 3 length of c, described heating furnace are below percent 8.5 of bringing-up section 1 and preheating section 2 total lengths, and the length-width ratio of stove tail expansion segment 3 is 1: 3-1: 5,

2, continuous-heating furnace for forging according to claim 1, it is characterized in that, on body of heater bringing-up section 1 preheating section 2 of described heating furnace and the furnace bottom of stove tail expansion segment 3, be provided with the slide rail 4 of band " V " type groove, on cutting somebody's hair 12 bases, pusher also is provided with " V " type projection corresponding with slide rail 4

3, according to claim 1 and 2 described continuous-heating furnace for forging, it is characterized in that the arch ring 9 of described body of heater section 1 furnace roof is the layout of just being separated by, on the side wall of bringing-up section 1, be provided with a plurality of rectangular preiections 5,

4, according to claim 1 and 2 described continuous-heating furnace for forging, it is characterized in that, described before chokes wall 8 and back chokes wall 7, respectively with the side wall groove 14 of bringing-up section 1, the side wall groove 15 of preheating section 2 connects, and preceding chokes wall 8 and back chokes wall 7 water the material cast and form for steel fibre is fire-resistant.

Images