CN107940991A - A kind of segmented car type furnace and transfiguration combined method - Google Patents
A kind of segmented car type furnace and transfiguration combined method Download PDFInfo
- Publication number
- CN107940991A CN107940991A CN201711350755.4A CN201711350755A CN107940991A CN 107940991 A CN107940991 A CN 107940991A CN 201711350755 A CN201711350755 A CN 201711350755A CN 107940991 A CN107940991 A CN 107940991A
- Authority
- CN
- China
- Prior art keywords
- fire door
- segmented
- trolley
- burner hearth
- car type
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
- F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
- F27B9/26—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace on or in trucks, sleds, or containers
- F27B9/262—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace on or in trucks, sleds, or containers on or in trucks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
Abstract
The present invention relates to a kind of segmented car type furnace and transfiguration combined method.Segmented car type furnace includes rear fire door, preceding fire door, segmented trolley, furnace wall, fire door, which is equipped with, afterwards can make the driving device that it is moved in burner hearth, fire door is moved to the suitable position of the burner hearth with the trolley afterwards, and preceding fire door and rear fire door block the forward and backward outlet of the burner hearth and surround the segmented trolley with the furnace wall.Method includes step：Determine the quantity of segmented trolley, segmented trolley is moved to the designated position of the burner hearth of segmented car type furnace；Rear fire door is set to run to the afterbody of trolley, the forward and backward outlet of preceding fire door and rear fire door closure burner hearth simultaneously surrounds segmented trolley with furnace wall.The present invention realizes that transfiguration provides quick succinct operating technology for heat-treatment furnace, heating furnace or annealing furnace, so that transmission device is easy to off-line maintenance during overhaul of the equipments, accomplish maintenance off-line, while also can guarantee that on-bne repair and the security safeguarded, and it is compact-sized, easy to operate.
Description
Technical field
The present invention relates to segmented car type furnace technical field, more particularly to a kind of segmented car type furnace and transfiguration combination side
Method.
Background technology
Segmented car type furnace be from standard car type furnace change, be primarily adapted for use in steel mill, special steel, mechanical processing, change machine,
Heavy industry, metallurgical smelting, casting, forging, flange ring, steel member, wire drawing, environmental protection equipment, machinery support enterprise, loading machine, bavin
The heat treatment department heating of the industries such as oil machine, military project is used.
The problem of trolley segmentation transfiguration of segmented car type furnace and oven door sealing, be the key of variable displacement type segmented car type furnace
Property technology, is related to whether whole stove can run well and the problem of furnace output, warp of the simul relation to whole project
Ji benefit.
Fixing fire door in the prior art can only move with the movement of fire door, and when discharging, trolley can only be with stationary furnace
The opposite direction movement of door, if over fixed fire door positive direction movement will make cylinder in oven door sealing and other original papers because
Fire box temperature is excessive to cause sealing device to be burnt.Moved for fire door after preventing when furnace temperature is excessive along burner hearth direction scaling loss of walking
Water-tight equipment on dynamic furnace wall, rear fire door can only be moved with the movement of trolley, greatly limit the direction of travel of trolley.This
When transfiguration operability of the structure for trolley also unobvious, trolley need transfiguration some it is directly exposed outside furnace body not
Easy to operation and walking.
Meanwhile the prior art also has the problem of maintenance inconvenience, because furnace temperature is higher, when equipment component breaks down on fire door
When be not easy to on-bne repair, can only generally wait temperature lower after off-line maintenance, this make it that stove production efficiency is relatively low, and yield is not
Height, influences operation and the economic benefit of whole project.
The prior art also there are the ineffective activity of transfiguration, either mainly meets big blank or mainly meets adding for small blank
Heat or heat treatment, the utilization rate of stove is relatively low, hinders the production requirement that enterprise is flexibly invested so that production equipment repeats
Build, cause the waste of resource, improve production cost.
Therefore, in order to improve the operability of trolley transfiguration so that capital equipment is easy to online maintenance, while can in time
Meet the production requirement of big blank and small blank, improve the utilization rate and production efficiency of trolley, economize on resources and cost, it is necessary to
A kind of effective transfiguration technology of segmented trolley is provided.
The content of the invention
In view of the above-mentioned problems, the present invention is intended to provide a kind of segmented car type furnace and transfiguration combined method, to solve trolley
Transfiguration is not easy operational problem, and capital equipment is not easy to on-bne repair, cannot meet big blank and small blank at the same time
Production requirement, resource and it is with high costs the problem of.
The present invention provides a kind of segmented car type furnace, and the segmented car type furnace includes rear fire door, preceding fire door, segmented platform
Car, furnace wall, the rear fire door, which is equipped with, can make the driving device that it is moved in burner hearth, and the rear fire door is moved to the trolley
The suitable position of the burner hearth, the preceding fire door and it is described after fire door block the burner hearth forward and backward outlet and with the furnace wall
Surround the segmented trolley.
Above-mentioned segmented car type furnace, it is described after fire door be equipped with sealing device, the sealing device include sealing strip and
Sealing driving, it is described to seal driving for driving the sealing strip to stretch out so as to seal the rear seam between fire door and the furnace wall
Gap, or withdraw the sealing strip.
Further, the sealing device be arranged in it is described after fire door top and both sides, including upper seal modules, side be close
Module and angle seal modules are sealed, the angle seal modules are connected the upper seal modules and side seal module.
Preferably, the sealing is driven to cylinder driving.
The preceding fire door of the segmented car type furnace be along burner hearth cross section it is traversing so as to blocking the preceding outlet of the burner hearth
Traversing fire door, fire door is arranged on the other end of the burner hearth, the traversing fire door connection institute after the traversing fire door is relatively described
Furnace wall is stated, the traversing fire door, furnace wall and rear fire door surround to form burner hearth successively, and the segmented trolley is located in the burner hearth
Form the segmented car type furnace.
Above-mentioned segmented car type furnace, the segmented trolley can be one or more.Each trolley can be connected at more
It is integral.
Above-mentioned segmented car type furnace, it is preferable that the driving device of fire door and the segmented trolley is electricity after described
Machine gear reducer drives or sprocket wheel chain drive.
The present invention also provides a kind of method combined using above-mentioned segmented car type furnace transfiguration, the described method includes following
Step：
Determine the quantity of segmented trolley, the segmented trolley is moved to the finger of the burner hearth of the segmented car type furnace
Positioning is put；
The rear fire door is set to run to the afterbody of the trolley, the preceding fire door and the rear fire door block the burner hearth
Forward and backward outlet simultaneously surrounds the segmented trolley with the furnace wall.
Above-mentioned method, the method further include：When opening the rear fire door, start the sealing device of the rear fire door,
The sealing strip on the rear fire door is set to be separated with the furnace wall；When closing the rear fire door, start the sealing dress of the rear fire door
Put, the gap after making the sealing strip sealing described between fire door and the furnace wall.
Above-mentioned method, when the segmented trolley is more, first will more segmented trolleys connection, then by institute
State the designated position that more segmented trolleys are moved to the burner hearth of the segmented car type furnace.
The segmented car type furnace and transfiguration technology of the present invention, segmented trolley and rear fire door isolated operation so that rear fire door
With trolley can flexible combination with split, be easy to implement way traffic, and the big I of segmented trolley is optionally combined to adapt to not
With the demand of blank, the sealing control of rear fire door is flexible, is integrally improved operability and the flexibility of trolley transfiguration so that main
Equipment is wanted to improve the utilization of trolley easy to online maintenance, while disclosure satisfy that the production requirement of big blank and small blank in time
Rate and production efficiency, have saved resource and cost, and a kind of effective transfiguration technology is provided for segmented trolley field.
Brief description of the drawings
Fig. 1 is the car type furnace structure diagram of more segmented trolley compositions of the embodiment of the present invention；
Fig. 2 is the car type furnace and trolley structure schematic diagram formed after more segmented trolleys of the embodiment of the present invention are split；
Fig. 3 is furnace door sealing device structure diagram after the embodiment of the present invention；
Fig. 4 is fire door movement schematic diagram after the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and examples, the embodiment of the present invention is described in more details, so as to energy
The advantages of enough more fully understanding the solution of the present invention and various aspects.However, specific embodiments described below and implementation
Example is for illustrative purposes only, rather than limitation of the present invention.
The segmented car type furnace of the present invention is a kind of key that transfiguration is realized in heat-treatment furnace, heating furnace or annealing furnace field
Equipment.
As shown in Figure 1, the segmented car type furnace of the present invention includes rear fire door 1, preceding fire door 2, segmented trolley 3, segmented
Trolley 4, furnace wall 5, it is described after fire door 1 be equipped with and can make the driving device that it move in burner hearth 6, it is described after fire door 1 with described
Car is moved to the suitable position of the burner hearth 6, and the preceding fire door 2 and the rear fire door 1 block the forward and backward outlet of the burner hearth 6
And surround the segmented trolley 3, segmented trolley 4 with the furnace wall 5.Certain segmented trolley can be such as the present embodiment
More composition monoblock types or single segmented trolley is split as according to the demand of blank as shown in Figure 2.
Wherein, the preceding fire door 2 of the segmented car type furnace be along burner hearth cross section it is traversing so as to blocking the burner hearth
The traversing fire door of preceding outlet, the relatively described rear fire door 1 of the traversing fire door are arranged on the other end of the burner hearth 6, the traversing stove
Door connects the furnace wall 5, and the traversing fire door, furnace wall 5 and rear fire door 1 surround to form burner hearth successively, the segmented trolley 3 with
4 form the segmented car type furnace in the burner hearth.
Above-mentioned segmented car type furnace, it is described after fire door 1 be equipped with sealing device, the sealing device include sealing strip and
Sealing driving, the sealing driving be used to driving the sealing strip to stretch out so as to seal it is described after between fire door 1 and the furnace wall 5
Gap, or withdraw the sealing strip.
Preferably, the sealing is driven to cylinder driving.
Specifically, the sealing device be arranged in it is described after fire door 1 top and both sides, including upper seal modules, side be close
Module and angle seal modules are sealed, the angle seal modules are connected the upper seal modules and side seal module.
As shown in figure 3, the structure of rear fire door 1, in addition to Motorized drive unit 11, sealing device includes oven door sealing bar one
12nd, oven door sealing bar 2 13, oven door sealing bar 3 14, oven door sealing bar 4 15, oven door sealing bar 5 16 and cylinder driving.Wherein
Oven door sealing bar 3 14 is upper seal modules, and oven door sealing bar 1 forms side seal module, fire door with oven door sealing bar 5 16
Sealing strip 2 13 forms angle seal modules with oven door sealing bar 4 15.
As shown in Fig. 2, when segmented trolley is used alone for the moment, starting the button of segmented trolley 1 first makes segmentation
Formula trolley 1 proceeds to the designated position of burner hearth 6, and then restarting Motorized drive unit 11 makes rear fire door 1 run to what is specified
Position, the compression sealing strip of fire door 1 after finally starting.First start oven door sealing bar 1, oven door sealing bar three in the present embodiment
14th, the button of oven door sealing bar 5 16, makes them push ahead at the same time, restarts oven door sealing bar 2 13, oven door sealing bar four
15 button, is made them while advanced to be fitted closely with furnace wall 5 with all sealing strips on fire door 1 after ensureing, avoid the occurrence of Lou
Fiery phenomenon.
The direction of motion of fire door 1 is bidirectional-movement after in the present invention, as shown in figure 4, it is to subtract that can take at the both ends of stroke
The pattern of speed movement, is the pattern that travels at the uniform speed in interlude.
In order to overhaul conveniently, the running part of rear fire door 1 should be arranged under ventilated environment or power section be done heat-insulated
Protection.
The method combined using above-mentioned segmented car type furnace transfiguration, the method mainly include step：Determine segmented
The quantity of trolley, makes the segmented trolley be moved to the designated position of the burner hearth of the segmented car type furnace；Make the rear stove
Door runs to the afterbody of the trolley, the preceding fire door and it is described after fire door block the burner hearth forward and backward outlet and with it is described
Furnace wall surrounds the segmented trolley.
When using monoblock type trolley, as shown in Figure 1, first connect segmented trolley 1 and segmented trolley 24,
Wherein middle with the segmented trolley 24 usable fibers cotton 7 of segmented trolley 1 as sealing material make two sections of trolleys connect after not
Hot barometric pressure is flowed into the steel construction region of trolley in permission stove, to ensure the safety and stability of trolley operation.
Segmented trolley is made of multiple Motorized drive units, each segmented trolley can realize front and rear operating, whole
Also multiple power units can be made during the operation of body formula while concentration drives to ensure the uniformity of trolley operation together.
Monoblock type trolley is driven to the designated position of furnace body by electrical control, as shown in Fig. 2, then restarting power
Driving unit 11 makes rear fire door 1 reach the position specified, the compression sealing strip of fire door 1 after finally starting.First start oven door sealing
Bar 1, oven door sealing bar 3 14, the button of oven door sealing bar 5 16, make them push ahead at the same time, restart oven door sealing
The button of bar 2 13, oven door sealing bar 4 15, makes them while advances to ensure that all sealing strips on fire door and furnace wall 5 are close
Fitting, avoids the occurrence of leakage fire phenomenon.
It should be noted that segmented trolley can be divided into 2 sections or multistage according to the requirement of technique, the trolley being each segmented
It can be operated alone or integrally be driven according to the requirement of technique, the driving unit of each segmented trolley leads to when entirety drives
Cross electric PLC and realize chain, the overall type of drive for controlling trolley, ensures that the walking manner of each segmented trolley is consistent.
Fire door 1 is combined with segmentation or the afterbody of integral trolley after being driven by motor, when after fire door 1 close to trolley afterbody
When stopped by travel switch or close to switch control with fire door 1 after ensureing and trolley according to predetermined position, prevent to touch
Hit.
When rear fire door 1 reaches the position specified, oven door sealing bar enables each sealing strip and furnace body after start button is opened
It is sealed around to protect the key equipment on fire door.
For fire door after movable type sealing device form can include it is following several：Air-cylinder type sealing device, hydraulic cylinder
Formula sealing device, Electrohydraulic push rod formula sealing device.The sealing device of air-cylinder type can be used for the occasion of bad environments, small investment fortune
Row maintenance cost is low；The sealing device of hydraulic cylinder type can be used for the occasion of bad environments but cost of investment is higher, operation
Maintenance cost is also high；Electrohydraulic push rod formula sealing device is only used for the occasion being not affected by high temperatures for the more demanding of environment.
The present invention preferably makes oven door sealing bar at the uniform velocity be moved on rear fire door to ensure that operating steadily for oven door sealing bar can by cylinder
Lean on.
For better seal, oven door sealing bar and fire resisting material of furnace body should use refractory fiber cotton.
For the ease of maintenance, the key equipment on fire door is evenly arranged on fire door and carries out thermal insulation protection, this transmission dress
Off-line maintenance can be met or meet on-bne repair by putting.Transmission device can be overhauled by fire door staircase during maintenance, both may be used
Accomplish maintenance off-line, while also can guarantee that on-bne repair and the security safeguarded.
Fire door driving and transmission device can include diversified forms afterwards：Motor reducer and cylinder drive form, decelerating through motor
Machine and Driven by Hydraulic Cylinder form, motor reducer and Electrohydraulic push rod drive form etc..
For segmented car type furnace the method for operation can include it is following several：Trolley drives from walking manner, sprocket wheel chain
Flowing mode, roller belt type of drive etc..Segmented trolley can be not only used for motor reducer and voluntarily go through the motions in the present invention
It can be used for sprocket chain strips etc..It is simple in structure wherein voluntarily to walk the method for operation, convenient operating maintenance, overall operation is stablized,
Area occupied is small, suitable for the longer stove of stroke；Requirement of the sprocket wheel chain type of drive to environment is less strict；Roller belt drives
Flowing mode is suitable for heavy duty.
Compared with prior art, segmented trolley of the invention is more flexible.The segmented trolley of the present invention can basis
Production scale required minimum and maximum blank designs the length of trolley, according to the big of blank when heating shove charge each time
The small suitable segmented trolley of selection, avoids causing the utilization rate of the energy and stove not high because blank is improper.The present invention
Segmented trolley and rear fire door can flexible bidirectional-movement, it is easy to accomplish transfiguration is combined, preferably solve trolley transfiguration this
Problem.
Oven door sealing and rear fire door self-powered dynamic sealing are fixed on trolley, and difference lies in fixed fire door can only be with trolley
Mobile and move, when discharging, trolley can only be moved with the opposite direction of fixed fire door, if over the positive direction of fixed fire door
Movement will make the cylinder in oven door sealing cause sealing device to be burnt because fire door temperature is excessive with other original papers, but self-powered
Dynamic fire door can be with furnace body direction random advance or retrogressing, using upper more convenient flexible.
For the Motorized drive unit of fire door after guarantee and the Motorized drive unit of segmented trolley, can be put at driving unit
Normally opened compressed air line is put, to ensure the normal operation of equipment.Only power source need to be used as just by the compressed air of plant area
It can make cylinder even running.
In addition, the present invention's is compact-sized, transmission torque is big, and investment is less.
All driving units in the present invention both can with field control can also remote control, can fully achieve automatic
Change.
Finally it should be noted that：Obviously, above-described embodiment is only intended to clearly illustrate example of the present invention, and simultaneously
The non-restriction to embodiment.For those of ordinary skill in the field, can also do on the basis of the above description
Go out other various forms of changes or variation.There is no necessity and possibility to exhaust all the enbodiments.And thus drawn
Among the obvious changes or variations that Shen goes out is still in protection scope of the present invention.
Claims (10)
1. a kind of segmented car type furnace, the segmented car type furnace includes rear fire door, preceding fire door, segmented trolley, furnace wall, it is special
Sign is that the rear fire door, which is equipped with, can make the driving device that it is moved in burner hearth, the rear fire door and the segmented trolley
Be moved to the suitable position of the burner hearth, the preceding fire door and it is described after fire door block the burner hearth forward and backward outlet and with institute
State furnace wall and surround the segmented trolley.
2. segmented car type furnace according to claim 1, it is characterised in that fire door is equipped with sealing device, institute after described
Stating sealing device includes sealing strip and sealing driving, and the sealing driving is used to drive the sealing strip to stretch out so as to seal described
Gap between fire door and the furnace wall afterwards, or withdraw the sealing strip.
3. segmented car type furnace according to claim 2, it is characterised in that the sealing device is arranged in the rear fire door
Top and both sides, including upper seal modules, side seal module and angle seal modules, the angle seal modules linking is described close
Seal module and side seal module.
4. segmented car type furnace according to claim 2, it is characterised in that the sealing is driven to cylinder driving.
5. segmented car type furnace according to claim 1, it is characterised in that the preceding fire door of the segmented car type furnace is edge
Burner hearth cross section it is traversing so as to blocking the traversing fire door of the preceding outlet of the burner hearth, fire door after the traversing fire door is relatively described
Arranged on the other end of the burner hearth, the traversing fire door connects the furnace wall, and the traversing fire door, furnace wall and rear fire door close successively
Enclose to form burner hearth, the segmented trolley, which is located in the burner hearth, forms the segmented car type furnace.
6. segmented car type furnace according to claim 1, it is characterised in that the segmented trolley is one or more.
7. segmented car type furnace according to claim 1, it is characterised in that fire door and the segmented trolley after described
Driving device is motor reducer driving or sprocket wheel chain drive.
A kind of 8. method combined using the transfiguration of claim 1 to 7 any one of them segmented car type furnace, it is characterised in that
It the described method comprises the following steps：
Determine the quantity of segmented trolley, the segmented trolley is moved to the specific bit of the burner hearth of the segmented car type furnace
Put；
Make it is described after fire door run to the afterbody of the trolley, the preceding fire door and it is described after fire door block the burner hearth before,
Export afterwards and surround the segmented trolley with the furnace wall.
9. according to the method described in claim 8, it is characterized in that, the method further includes：
When opening the rear fire door, start the sealing device of the rear fire door, make the sealing strip on the rear fire door and the stove
Wall separates；
When closing the rear fire door, start the sealing device of the rear fire door, fire door and institute after making the sealing strip sealing described
State the gap between furnace wall.
10. according to the method described in claim 8, it is characterized in that, when the segmented trolley be more when, first will be described more
Platform segmented trolley connects, then the more segmented trolleys are moved to the specific bit of the burner hearth of the segmented car type furnace
Put.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711350755.4A CN107940991A (en) | 2017-12-15 | 2017-12-15 | A kind of segmented car type furnace and transfiguration combined method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711350755.4A CN107940991A (en) | 2017-12-15 | 2017-12-15 | A kind of segmented car type furnace and transfiguration combined method |
Publications (1)
| Publication Number | Publication Date |
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| CN107940991A true CN107940991A (en) | 2018-04-20 |
Family
ID=61944378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711350755.4A Pending CN107940991A (en) | 2017-12-15 | 2017-12-15 | A kind of segmented car type furnace and transfiguration combined method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109708466A (en) * | 2019-01-22 | 2019-05-03 | 武汉重工铸锻有限责任公司 | Variable capacity tunnel type connecting rod heating furnace and heating means |
| CN110468272A (en) * | 2019-08-30 | 2019-11-19 | 武汉一冶钢结构有限责任公司 | A kind of large-scale heat-treatment furnace of transfiguration packaged type |
| CN114480814A (en) * | 2021-12-31 | 2022-05-13 | 丹阳市恒泰电炉有限公司 | Furnace body structure of sectional type mobile tempering furnace |
-
2017
- 2017-12-15 CN CN201711350755.4A patent/CN107940991A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109708466A (en) * | 2019-01-22 | 2019-05-03 | 武汉重工铸锻有限责任公司 | Variable capacity tunnel type connecting rod heating furnace and heating means |
| CN110468272A (en) * | 2019-08-30 | 2019-11-19 | 武汉一冶钢结构有限责任公司 | A kind of large-scale heat-treatment furnace of transfiguration packaged type |
| CN110468272B (en) * | 2019-08-30 | 2021-02-09 | 武汉一冶钢结构有限责任公司 | Large-scale heat treatment furnace with movable variable volume |
| CN114480814A (en) * | 2021-12-31 | 2022-05-13 | 丹阳市恒泰电炉有限公司 | Furnace body structure of sectional type mobile tempering furnace |
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