CN202881319U - Hung muffle tube for vertical bright annealing furnace - Google Patents
Hung muffle tube for vertical bright annealing furnace Download PDFInfo
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- CN202881319U CN202881319U CN 201220473658 CN201220473658U CN202881319U CN 202881319 U CN202881319 U CN 202881319U CN 201220473658 CN201220473658 CN 201220473658 CN 201220473658 U CN201220473658 U CN 201220473658U CN 202881319 U CN202881319 U CN 202881319U
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Abstract
The utility model relates to a hung muffle tube for a vertical bright annealing furnace, wherein a fireproof material and a supporting plate for fixing the fireproof material are respectively fixed in thickness single nodes at upper and lower ends; under a precondition that stresses of various single nodes of muffle materials are within an allowable tensile strength range, the lengths of the various thickness single nodes are determined by the thickness and material specifications of the various single nodes of muffle materials; stresses of the top ends of the various thickness single nodes are respectively determined by weights of the various thickness single nodes; the weight of the upper end thickness single node includes the weights of the fireproof material and the supporting plate for fixing the fireproof material in the upper end thickness single node, and the weight of the lower end thickness single node includes the weights of the fireproof material and the supporting plate for fixing the fireproof material in the lower end thickness single node; and from bottom to top, the stresses of the top ends of the various thickness single nodes are sequentially increased gradually. Stresses on various parts of the muffle tube are rationally distributed, so that thermal-structural coupling stress is rationally distributed when the muffle tube works at high temperature (at about 1150 DEG C); therefore, the anti-bearing ability of the muffle tube is remarkably improved.
Description
Technical field
The utility model relates to a kind of suspension muffle pipe, particularly the suspension muffle pipe in the vertical muffle bright annealing stove.
Background technology
The stepped muffle tube that has a more piece cylinder to consist of in the vertical muffle bright annealing stove stove, muffle tube adopts resistant to elevated temperatures Langaloy material (being generally 601 alloy materials) to make, not material is curling is welded into successively single-unit cylinder muffle tube after circularizing for a plurality of single-unit horses, and the cylindric muffle tube welding of more piece is combined into whole section cylindrical stepped muffle tube.
The upper end of muffle tube is fixed on the body of heater, and the muffle tube that is in suspension status is also bearing from heavy lift when bearing thermal stresses, and in use, muffle tube generation thermal creep and viscous deformation were also lost efficacy gradually.Each the single-unit muffle tube that is welded into whole section muffle tube is unreasonable because of length, Thickness Design, can cause whole section horse stress distribution not unreasonable.When carrying out work under the condition of high temperature, the defectives such as constriction, section deformation, banana-shaped bending, cracking appear in stress distribution irrational whole section muffle tube easily, significantly reduce work-ing life, and namely need change short then half a year.
The technical scheme that Japanese Unexamined Patent Publication No. Hei 3-168588 patent document proposes is the not uniform method of design of static stress at single-unit top of each horse, and Qi Gema not single-unit top strain is 0.1kg/mm2.Because the working temperature of muffle tube is up to 1150 ℃, calculate as can be known by finite element emulation software, adopt the not method of design of the stress equalization at single-unit top of horse, its horse is top heat-structure Coupling stress abnormality under hot conditions not, is significantly higher than the heat of other parts of muffle tube-structure Coupling stress.Thus, the irrational whole section muffle tube of stress distribution easily accelerates to lose efficacy under the high temperature production condition.Here it should be explicitly made clear at this point that at high temperature the heat of muffle tube-structure Coupling stress is only the stress under the real working condition of muffle tube, and the stress distribution situation of the static stress under the normal temperature can not the work of actual response muffle tube the time.
Application number is in 201110437181.0 the Chinese patent application file, has proposed a kind of method of design of suspension muffle for vertical bright annealing furnace.Although this method of design has adopted the not static stress at the single-unit top distribution design method that down successively decreases of each horse, bias toward the monomer stress studies of muffle tube, do not consider the weight of muffle tube two ends and body of heater interconnecting piece and the stress of generation thereof; And because heat insulation needs, horse not upper and lower all can arrange anti-material and the supporting plate of anti-the material with the protection furnace body temperature, and this is an influence factor can't ignoring; This patent application is not owing to remove this error effect, thus can not overall thinking muffle tube relevant connection parts on the impact of its stress, can't accurately reflect the true stress of muffle tube.When working under hot conditions by the muffle tube of this design length manufacturing, be subjected to the impact of muffle tube two ends and body of heater interconnecting piece, its true stress irrational distribution is unfavorable for the use of muffle tube and estimating of work-ing life.
In sum, at present for the design studies of each single-unit length of vertical hanging muffle tube and top strain, existing main research biases toward the static stress research of muffle tube, namely so that each single-unit top strain of muffle tube is approximate equal distribution state; Or bias toward the monomer stress studies of muffle tube pipe shaft, can not consider effectively that muffle tube relevant connection parts are on the impact of its stress.True stress when all can not the actual response muffle tube under hot conditions, working, the accordingly structure of optimization design muffle tube.
The utility model content
Technical problem to be solved in the utility model is: a kind of muffle tube is provided, muffle tube is the stress reasonable layout everywhere, so that muffle tube is when the lower work of high temperature (about 1150 ℃), heat-structure Coupling stress distribution is reasonable, can significantly promote the anti-inefficacy ability of muffle tube.
The technical scheme that its technical problem that solves the utility model adopts is:
A kind of suspension muffle pipe for vertical bright annealing furnace, muffle tube are welded in turn up and down by a plurality of thickness single-units and consist of; It is characterized in that: all be fixed with refractory materials in the thickness single-unit of upper and lower end and reach the fixedly supporting plate of refractory materials; Same thickness single-unit horse not in used single-unit horse not material thickness equate, the horse of different thickness single-unit not the thickness of material by being as thin as thick variation; In the same thickness single-unit used single-unit horse not length of material equate or do not wait; Not material is stressed is allowing within the tensile strength scope under the prerequisite each single-unit horse, and not determine by material thickness and material specification by each single-unit horse for each thickness single-unit length; The stress on each thickness single-unit top is determined by each thickness single-unit weight respectively, upper end thickness single-unit weight comprises that refractory materials reaches the fixedly weight of the supporting plate of refractory materials in the single-unit of upper end, and bottom thickness single-unit weight comprises that refractory materials reaches the fixedly weight of the supporting plate of refractory materials in the single-unit of bottom; And from the bottom to top, each thickness single-unit top stress increases progressively successively.
By technique scheme, each single-unit horse that consists of each the thickness single-unit not permissible stress value of material is σ=0.8 ~ 1.2N/mm
2
By technique scheme, each single-unit horse is material permissible stress value σ=0.9N/mm not
2
By technique scheme, when computed stress with refractory materials in the single-unit of upper and lower end and fixedly the weight of the supporting plate of refractory materials count respectively among the weight of place thickness single-unit muffle tube, fixing refractory materials reaches fixedly that the supporting plate weight of refractory materials always is designated as G in the thickness single-unit of muffle tube bottom
1'; The refractory materials of fixing in the thickness single-unit of muffle tube upper end reaches fixedly, and the supporting plate weight of refractory materials always is designated as G
N'; Mainly comprise the steps:
At first in conjunction with the material specification not of each single-unit horse in the thickness single-unit, determine each thickness single-unit thickness: from the bottom to top each the single-unit horse in the same thickness single-unit not the thickness of material equate and each single-unit horse thickness T of material not in the different thickness single-unit
1, T
2, T
3, T
4... T
NThick by being as thin as, thickness is T
1The single-unit horse not the thickness single-unit one that consists of of material welding be in suspension whole section horse not bottom; Each single-unit horse in the same thickness single-unit not material equal in length or do not wait;
Then, according to each single-unit horse not thickness and the material specification of material, not material is stressed under prerequisite within the permission tensile strength scope guaranteeing each single-unit horse, for so that each the thickness single-unit after the design is longer as much as possible, equal the theoretical maximum length that permissible stress calculates each thickness single-unit by making each thickness single-unit top stress;
Subsequently in conjunction with each single-unit horse not thickness and the maximum length specification of material, divided by each single-unit horse maximum length specification of material not, obtain actual single-unit horse that each thickness single-unit need to weld the not hop count of material and the physical length of each thickness single-unit by the theoretical maximum length of each thickness single-unit;
Again, obtain whole section muffle tube length by the physical length addition of each thickness single-unit;
At last, each thickness single-unit is combined into whole section muffle tube through welding, and the upper end of each the thickness single-unit after welding permissible stress is and increases progressively successively state.
According to technique scheme, when determining each thickness single-unit thickness, according to horse not density p, each thickness single-unit upper end permissible stress σ of material
1, σ
2, σ
3, σ
4... σ
NThe cross-sectional area S of each thickness single-unit and each single-unit horse be the internal-and external diameter specification of material not, so that each thickness single-unit weight is minimum and guarantee to determine the not thickness T of material of each single-unit horse under the prerequisite of mechanical property of muffle tube bottom necessity
1, T
2, T
3, T
4... T
N
According to technique scheme, the length of each thickness single-unit and whole section not specifically by the following method configuration of length of horse:
Thickness is T
1The length collocation method of single-unit one be: set horse not the density of material be ρ, thickness is T
1Single-unit one upper end permissible stress σ
1, the cross-sectional area of single-unit one is S
1, for so that horse not weight is minimum and guarantee the not mechanical property of bottom necessity of horse, select the not thickness of slab T of material of the used single-unit horse of single-unit one
1Actual value; For proof stress in allowable stress range, single-unit one top strain
Single-unit one deadweight G
1=ρ S
1L
1+ G
1'; Not conduct oneself with dignity for reducing horse, so that thin plate is longer as much as possible, get σ
1=σ carries out single-unit one theoretical maximum length L
1Calculating,
Be T in conjunction with thickness
1The single-unit horse specification of material not, by single-unit one theoretical maximum length L
1Divided by the horse of the single-unit one maximum length specification of material not, obtain actual single-unit horse that single-unit one needs the welding not hop count of material and the physical length L of single-unit one
1';
Thickness is T
2The length collocation method of single-unit two be: for proof stress in allowable stress range, single-unit two horses are the stress of upper end not
Not conduct oneself with dignity for reducing horse, so that thin plate is longer as much as possible, get σ
2=σ carries out the theoretical maximum length L of single-unit two
2Calculating,
Be T in conjunction with thickness
2The single-unit two horses specification of material not, by single-unit two theoretical maximum length L
2Divided by the horse of the single-unit two maximum length specification of material not, obtain actual single-unit horse that single-unit two needs welding not material hop count and draw the physical length L of single-unit two
2';
Thickness is T
3The length collocation method of single-unit three be: for proof stress in allowable stress range, make single-unit three top stress equal the theoretical length that permissible stress draws single-unit three
Be T in conjunction with thickness
3The horse specification of material not, draw the physical length L of single-unit three
3';
By parity of reasoning, in like manner can get L
4', L
5', L
6', L
7', L
8', L
9', L
10' ... L
N';
Wherein thickness is T
NThe length collocation method of single-unit N be:
Equal permissible stress for proof stress makes single-unit N top stress in allowable stress range, draw the theoretical length of single-unit N
Be T in conjunction with thickness
NThe single-unit horse specification of material not, draw the physical length L of single-unit N
N';
It is L=L that each thickness single-unit length addition obtains the muffle tube total length
1'+L
2'+L
3'+... + L
N'.
By technique scheme, each thickness single-unit top stress σ
1, σ
2, σ
3, σ
4... σ
NBe successively and increase progressively.
By technique scheme, can by connecting anti-material and the supporting plate of anti-the material to body of heater, reduce anti-material and the supporting plate of anti-material gross weight G
1', G
N' on the impact of muffle tube stress.
Thus, the impact of the utility model overall thinking muffle tube interconnecting piece counter stress, not length and the thickness of each thickness single-unit design to horse, the reasonable layout muffle tube is stress everywhere, each single-unit top strain of muffle tube that assurance is combined into through welding not is and increases progressively successively distribution in lower end to upper end from horse, so that muffle tube is when the lower work of high temperature (about 1150 ℃), heat-structure Coupling stress distribution is reasonable, promotes the anti-inefficacy ability of muffle tube.
Description of drawings
Fig. 1 is the structural representation of the utility model preferred embodiment suspension muffle pipe; Wherein, Reference numeral 1-13 represents 13 single-units of suspension muffle pipe successively; 14 is refractory materials; 15 are the fixing supporting plate of refractory materials; 16 is flange.
Fig. 2 is the utility model preferred embodiment suspension muffle pipe static stress distribution plan (muffle tube structure gradient from left to right, thickness of slab gradient, stress gradient is corresponding one by one respectively).
Embodiment
The utility model is described in further detail below in conjunction with embodiment and accompanying drawing, but do not limit the utility model.
As shown in Figure 1,13 single-units of suspension muffle pipe (by Reference numeral 1 to 13) required the single-unit horse thickness T of material not
1, T
2, T
3, T
4... T
10By being as thin as the thick 5mm of being followed successively by, 6mm, 7mm, 8mm, 10mm, 12mm, 14mm, 17mm, 20mm, 22mm, each single-unit horse not material specification maximum outside diameter is 1710mm behind the full circle in order to be curled into respectively, maximum inner diameter is 1690mm; Single-unit 1-4(Reference numeral 1-4 wherein) thickness equates, is T
1, thereby to be considered as same thickness in when design be T
1Single-unit, this single-unit length is single-unit 1-4 length sum; By that analogy, the follow-up thickness that is respectively is T
2Single-unit, thickness be T
3Single-unit ... .. thickness is T
10Single-unit;
In the present embodiment to each single-unit horse not material get permissible stress 0.8～1.2N/mm
2, preferred σ=0.9N/mm
2
Thickness is T
1Single-unit be in whole section suspension muffle pipe bottom; This single-unit theoretical length is L
1, this single-unit upper end permissible stress is σ to the maximum, and the horse not density of material is ρ, ρ=8.1 * 10
3Kg/m
3, the cross-sectional area of this single-unit is S
1, for so that horse not weight is minimum and guarantee horse mechanical property not, thickness is T
1The thickness of slab T of single-unit
1Get 5mm;
Thickness is T
1Single-unit be T with thickness bottom
10Single-unit topmost all be fixed with refractory materials 14 and the fixing supporting plate 15 of refractory materials; Thickness is T
1Single-unit in refractory materials 14 and fixedly the weight of the supporting plate 15 of refractory materials add up to G
1'=234kg, thickness are T
10Single-unit in refractory materials 14 and fixedly the weight of the supporting plate 15 of refractory materials add up to G
10'=82kg;
Thickness is T
1Single-unit deadweight G
1=ρ S
1L
1+ G
1';
Be proof stress safety, thickness is T
1The single-unit top strain
Not conduct oneself with dignity for reducing horse, so that thin plate is longer as much as possible, get ρ L
1=σ
1=σ,
L
1For thickness is T
1The theoretical maximum length of single-unit, be T in conjunction with thickness
1The horse specification of material not, its length is 2330mm, i.e. thickness T
1Be the not desirable four sections welding of material of horse of 5mm, drawing thickness is T
1The physical length L of single-unit
1'=9320mm.
Be proof stress safety, thickness is that the stress on the single-unit of T2 is
Not conduct oneself with dignity for reducing horse, so that thin plate is longer as much as possible, get σ
2=σ,
L
2For thickness is T
2Single-unit theoretical maximum length, be T in conjunction with thickness
2The horse specification of material not, drawing thickness is T
2The physical length L of single-unit
2'=1790mm.
In like manner can get:
Thickness is T
3Single-unit theoretical maximum length
Be T in conjunction with thickness
3The horse specification of material not, drawing thickness is T
3The physical length L of single-unit
3'=1560mm.
In like manner can get: L
4'=1390mm, L
5'=2260mm, L
6'=1880mm, L
7'=1600mm, L
8'=1960mm, L
9'=1740mm, L
10'=1000mm;
Horse not total length is: L=L
1'+L
2'+L
3'+L
4'+L
5'+L
6'+L
7'+L
8'+L
9'+L
10'=24500mm.
Calculate with finite element method by Computer Simulation through mechanics of materials formula, the stress distribution when Chinese patent application in above-mentioned design result and the background technology is not considered that refractory materials reaches the supporting plate of fixing refractory materials is studied and compares.Each single-unit length, thickness and the top stress data of suspension muffle pipe are shown in front 5 row of table 1 in the utility model, and table 1 rightmost side one is classified the stress distribution situation when Chinese patent application is not considered anti-material and supporting plate thereof in the background technology as.
Table 1
By the above-mentioned contrast in the table 1 as can be known, when the muffle tube overall length is identical with joint number, be based on equally each thickness single-unit upper end permissible stress σ
1, σ
2, σ
3, σ
4... σ
NBe and increase progressively successively design, do not consider refractory materials and fixedly during the supporting plate of refractory materials, stress calculating results shows single-unit 1 top stress minimum, is 0.185N/mm
2Single-unit 13 top stress are maximum, are 0.856N/mm
2
Consider refractory materials and fixedly during the supporting plate of refractory materials, stress calculating results shows single-unit 1 top stress minimum, is 0.271N/mm
2, single-unit 13 top stress are maximum, are 0.882N/mm
2
Obviously, when design muffle tube single-unit length, do not consider and the inner refractory materials that is connected of muffle tube and the fixing supporting plate of refractory materials that the stress value error on each single-unit of gained is large, stressed condition that can not the actual response muffle tube.And the utility model is truly considered the actual weight of single-unit, can the reasonable layout muffle tube stress everywhere, the whole section horse that assurance is combined into through welding be reasonable stress not, the impact of overall thinking muffle tube interconnecting piece counter stress, guarantee that each single-unit top strain of muffle tube not is and increases progressively successively distribution in lower end to upper end from horse, so that muffle tube is when the lower work of high temperature (about 1150 ℃), heat-structure Coupling stress distribution is reasonable, promotes the anti-inefficacy ability of muffle tube.
Embodiment 2:
As shown in table 2, Japanese Unexamined Patent Publication No. Hei 3-168588 patent document in the background technology is based on the design of muffle tube single-unit top static stress equalization, method of design of the present utility model has following obvious difference (left side is the utility model, and the right side is the design based on muffle tube single-unit top static stress equalization):
Table 2
Further, table 3 has been concluded in two kinds of situations the maximum stress on the pure physical construction stress and heat-structure Coupling stress and the comparative analysis result of happening part thereof.Be of a size of the affiliated part thickness of slab in maximum stress unit in the table bracket.
Each main parts size of table 3 (part) maximum stress and position, place
By the contrast and experiment of table 2 and 3 as can be known: two kinds of structure horses are not under deadweight static(al) and thermal stresses effect, the stress difference is little, but in the design of single-unit top static stress equalization, when the muffle tube overall length is identical with joint number, the about 430kg of weight saving can suitably reduce cost.But because the weight of the nonlinearities change characteristics characteristics of its thermal stresses and the upper and lower end supporting plate of anti-the material is larger etc. on the thermal stresses impact, significantly there is certain security risk in loss of weight, thereby still adopts the utility model more safe and reliable.
Above disclosed only is preferred embodiment of the present utility model, certainly can not limit with this interest field of the utility model, and the equivalence of therefore doing according to the utility model claim changes, and still belongs to protection domain of the present utility model.
Claims (3)
1. suspension muffle pipe that is used for vertical bright annealing furnace, muffle tube by a plurality of thickness single-units up and down in turn welding consist of; It is characterized in that: all be fixed with refractory materials in the thickness single-unit of upper and lower end and reach the fixedly supporting plate of refractory materials; Same thickness single-unit horse not in used single-unit horse not material thickness equate, the horse of different thickness single-unit not the thickness of material by being as thin as thick variation; In the same thickness single-unit used single-unit horse not length of material equate or do not wait; Not material is stressed is allowing within the tensile strength scope under the prerequisite each single-unit horse, and not determine by material thickness and material specification by each single-unit horse for each thickness single-unit length; The stress on each thickness single-unit top is determined by each thickness single-unit weight respectively, upper end thickness single-unit weight comprises that refractory materials reaches the fixedly weight of the supporting plate of refractory materials in the single-unit of upper end, and bottom thickness single-unit weight comprises that refractory materials reaches the fixedly weight of the supporting plate of refractory materials in the single-unit of bottom; And from the bottom to top, each thickness single-unit top stress increases progressively successively.
2. suspension muffle pipe according to claim 1 is characterized in that: each single-unit horse that consists of each the thickness single-unit not permissible stress value of material is σ=0.8 ~ 1.2N/mm
2
3. suspension muffle pipe according to claim 1 and 2, it is characterized in that: each single-unit horse is material permissible stress value σ=0.9N/mm not
2
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220473658 CN202881319U (en) | 2012-09-17 | 2012-09-17 | Hung muffle tube for vertical bright annealing furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220473658 CN202881319U (en) | 2012-09-17 | 2012-09-17 | Hung muffle tube for vertical bright annealing furnace |
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| Publication Number | Publication Date |
|---|---|
| CN202881319U true CN202881319U (en) | 2013-04-17 |
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|---|---|---|---|
| CN 201220473658 Expired - Fee Related CN202881319U (en) | 2012-09-17 | 2012-09-17 | Hung muffle tube for vertical bright annealing furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102839261A (en) * | 2012-09-17 | 2012-12-26 | 中冶南方(武汉)威仕工业炉有限公司 | Suspension muffle pipe |
-
2012
- 2012-09-17 CN CN 201220473658 patent/CN202881319U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102839261A (en) * | 2012-09-17 | 2012-12-26 | 中冶南方(武汉)威仕工业炉有限公司 | Suspension muffle pipe |
| CN102839261B (en) * | 2012-09-17 | 2014-03-12 | 中冶南方(武汉)威仕工业炉有限公司 | Suspension muffle pipe |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130417 Termination date: 20150917 |
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| EXPY | Termination of patent right or utility model |