CN201873735U - Unit with functions of continuous hot galvanizing and continuous annealing - Google Patents
Unit with functions of continuous hot galvanizing and continuous annealing Download PDFInfo
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- CN201873735U CN201873735U CN2010206226051U CN201020622605U CN201873735U CN 201873735 U CN201873735 U CN 201873735U CN 2010206226051 U CN2010206226051 U CN 2010206226051U CN 201020622605 U CN201020622605 U CN 201020622605U CN 201873735 U CN201873735 U CN 201873735U
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Abstract
The utility model relates to the field of strip steel processing and discloses a unit with functions of continuous hot galvanizing and continuous annealing. The unit comprises a heating section, a rapid cooling section, a hot tension roller chamber, a zinc pot, a first cooling device, a second cooling device, a third cooling device, a fourth cooling device, a circulating air cooling device, a water quenching device, a wringing device and a drying device, and is characterized in that an ageing section area used for continuous annealing is arranged at the hot tension roller chamber and the circulating air-cooling device in a way of parallel connection. Due to the simple improvement for the existing continuous hot galvanizing unit, the unit realizes the two functions of continuous hot galvanizing and continuous annealing, so that the operation efficiency of the unit is improved, and the investment cost is greatly saved. Furthermore, the unit with the functions of continuous hot galvanizing and continuous annealing has the advantages of having simple structure, being convenient to install, and having low cost, high space utilization rate, simple operation and good using effect.
Description
Technical field
The utility model relates to band steel manufacture field, in particular a kind of unit with continuous hot galvanizing and continuous annealing function.
Background technology
The zinc-plated process for treating surface that is meant in effects such as the surface of metal, alloy or other material plating one deck zinc are attractive in appearance to play, antirust.
At present steel galvanization is mainly adopted Continuous Hot Dip Galvanizing, 1450 Continuous Hot Dip Galvanizing for example, its zinc-plated flow process mainly comprises degreasing-heating, and--cold soon--zinc-plated-air-cooled--this several steps of passivation--is extracted--in shrend.
But the zinc-plated unit of prior art does not have the continuous annealing function.The industrialization continuously dip coat zinc product and the annealing product of prior art is to adopt on the different unit of function to produce (promptly not producing) on same lines, increased production cost and facility investment.
Therefore, prior art has yet to be improved and developed.
The utility model content
In view of above-mentioned the deficiencies in the prior art, the purpose of this utility model is to provide a kind of unit with continuous hot galvanizing and continuous annealing function, it has continuous annealing and zinc-plated two kinds of functions, and its have simple in structure, easy for installation, cost is low, space availability ratio is high, simple to operate, the good advantage of result of use.
The technical solution of the utility model is as follows:
A kind of unit with continuous hot galvanizing and continuous annealing function, comprise heating zone that order is provided with, fast cold section, thermotension roller chamber, zinc pot, first refrigerating unit, second refrigerating unit, the 3rd refrigerating unit, the 4th refrigerating unit, recirculating air device for cooling, granulating unit, wiping arrangement, drying unit, wherein, be arranged in parallel the timeliness section district that is used for continuous annealing in described thermotension roller chamber and recirculating air device for cooling place.
Described unit with continuous hot galvanizing and continuous annealing function, wherein, described first refrigerating unit and second refrigerating unit, be arranged side by side with the 3rd refrigerating unit and the 4th refrigerating unit, and at described first refrigerating unit and second refrigerating unit, and be provided with interstice coverage between described the 3rd refrigerating unit and the 4th refrigerating unit, described timeliness section district is arranged in the described interstice coverage.
Described unit with continuous hot galvanizing and continuous annealing function wherein, is provided with 1# deflector roll, 2# deflector roll successively between described second refrigerating unit and the 3rd refrigerating unit; Described 1# deflector roll and vertical setting of described second refrigerating unit, described 2# deflector roll and vertical setting of described the 3rd refrigerating unit, and described 1# deflector roll and described 2# deflector roll be arranged in parallel.
Described unit with continuous hot galvanizing and continuous annealing function wherein, is provided with the manhole case between thermotension roller chamber and timeliness section district, be used for the mutual conversion between continuous annealing and the zinc-plated two kinds of functions.
Described unit with continuous hot galvanizing and continuous annealing function, wherein, the continuous annealing that constitutes by described heating zone, fast cold section, thermotension roller chamber, manhole case, timeliness section district, recirculating air device for cooling, granulating unit, wiping arrangement, drying unit, be provided with furnace roller completely, along being with the steel traffic direction with a lines arranged in form.
Described unit with continuous hot galvanizing and continuous annealing function, wherein, described timeliness section district comprises upper and lower 18# furnace roller, 19# furnace roller, 20# furnace roller, 21# furnace roller, 22# furnace roller, 23# furnace roller, 24# furnace roller, 25# furnace roller, 26# furnace roller, 27# furnace roller, 28# furnace roller and the 29# furnace roller that is provided with at interval successively; Described 29# furnace roller and described 28# furnace roller be arranged in parallel, and described 29# furnace roller and vertical setting of described recirculating air device for cooling.
Described unit with continuous hot galvanizing and continuous annealing function wherein, also is provided with the 30# furnace roller on the vertical line between described 29# furnace roller and the described recirculating air device for cooling.
Described unit with continuous hot galvanizing and continuous annealing function wherein, is provided with the 15# furnace roller between described thermotension roller chamber and described timeliness section district, described 15# furnace roller and vertical setting the in described thermotension roller chamber, and be arranged in parallel with described 18# furnace roller.
Described unit with continuous hot galvanizing and continuous annealing function wherein, is disposed with first carrying roller and second carrying roller between described 18# furnace roller and described 15# furnace roller.
Described unit with continuous hot galvanizing and continuous annealing function, wherein, the zinc-plated all fronts that are made of described heating zone, fast cold section, thermotension roller chamber, zinc pot, first refrigerating unit, second refrigerating unit, 1# deflector roll, 2# deflector roll, the 3rd refrigerating unit, the 4th refrigerating unit, recirculating air device for cooling, granulating unit, wiping arrangement, drying unit are provided with furnace roller, along band steel direct of travel with a lines arranged in form.
Wherein, 1. continuous hot galvanizing technical process:
Uncoiling, degreasing, kink etc. → heating zone → fast cold section → thermotension roller chamber → zinc pot → first refrigerating unit → second refrigerating unit → the 3rd refrigerating unit → the 4th refrigerating unit → recirculating air device for cooling → granulating unit → wiping arrangement → drying unit → levelling machine, straightener, kink, rolling etc.
2. continuous annealing process flow process:
Uncoiling, degreasing, kink etc. → heating zone → fast cold section → thermotension roller chamber (only working the effect that turns to) → 15# furnace roller → timeliness section (18# furnace roller → 19# furnace roller → 20# furnace roller → 21# furnace roller → 22# furnace roller → 23# furnace roller → 24# furnace roller → 25# furnace roller → 26# furnace roller → 27# furnace roller → 28# furnace roller → 29# furnace roller → 30# furnace roller) → recirculating air device for cooling → granulating unit → wiping arrangement → drying unit → levelling machine, straightener, kink, rolling etc.
Tradition continuous zinc coating unit and continuous annealing unit are independently to separate, this equipment machine set system is by changing in thermotension roller chamber, first can be transformed into the 15# furnace roller enters the timeliness section again, thereby realize the continuous annealing function: second can be transformed into the zinc pot enters four refrigerating units more successively, thereby realizes zinc-plated function.
Unit with continuous hot galvanizing and continuous annealing function provided by the utility model, the simple modifications by to existing zinc-plated unit realizes that it has continuous annealing and zinc-plated two kinds of functions, has improved the operating rate of unit, and the cost of can reducing investment outlay greatly.And the utility model is simple in structure, easy for installation, cost is low, space availability ratio is high, simple to operate, result of use good.
Description of drawings
Fig. 1 is the set structure synoptic diagram that the utility model embodiment 1 has continuous hot galvanizing and continuous annealing function.
Fig. 2 is the unit synoptic diagram that the utility model embodiment 2 has continuous hot galvanizing and continuous annealing function.
Embodiment
The utility model provides a kind of unit with continuous hot galvanizing and continuous annealing function, and is clearer, clear and definite for making the purpose of this utility model, technical scheme and effect, below with reference to accompanying drawing and give an actual example the utility model is further described.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
A kind of unit of the utility model embodiment with continuous hot galvanizing and continuous annealing function, by simple modifications to existing zinc-plated unit, realize that it has continuous annealing and zinc-plated two kinds of functions, as shown in Figure 1, described unit with continuous hot galvanizing and continuous annealing function comprises the heating zone 100 that order is provided with, fast cold section 110, thermotension roller chamber 120, zinc pot 130, first refrigerating unit 140, second refrigerating unit 150, the 3rd refrigerating unit 160, the 4th refrigerating unit 170, recirculating air device for cooling 180, granulating unit 190, wiping arrangement 200, drying unit 210.In the present embodiment, be arranged in parallel the timeliness section district 300 that is used for continuous annealing in described thermotension roller chamber 120 and recirculating air device for cooling 180 places.
Wherein, described recirculating air device for cooling 180 adopts frequency conversion fan, and model is: HTH-12No6.5A is along 225, and power is: 45KW, rotating speed is: 2900rpm, air quantity is: 33000m
3/ h, pressure: 3300Pa.Described first refrigerating unit 140, second refrigerating unit 150, the 3rd refrigerating unit 160, the 4th refrigerating unit 170 adopt cool wind box, and irreversible cold wind is adopted in its cooling, is used for the progressively cooling to the band steel of processing.
Described granulating unit 190 is used for by high pressure water the band steel of processing further being sprayed quick cooling, and two cover water pumps are set within it, be one main with and one standby, water pump employing power: 30KW; Flow: 173m
3/ h, the water pump of lift: 38m.
As shown in Figure 1, described wiping arrangement 200 is vertical wiping arrangement, is used for the band steel of processing is extracted, and it compresses, unclamps four groups of solenoid control of employing, four groups of magnetic valve independent control.
Described drying unit 210 is used for the band steel of shrend is dried.
Further, as shown in Figure 1, described first refrigerating unit 140 and second refrigerating unit 150, be arranged side by side with the 3rd refrigerating unit 160 and the 4th refrigerating unit 170, and at described first refrigerating unit 140 and second refrigerating unit 150, and be provided with interstice coverage 220 between described the 3rd refrigerating unit 160 and the 4th refrigerating unit 170, described timeliness section district 300 is arranged in the described interstice coverage 220.
Further, as shown in Figure 1, between described second refrigerating unit 150 and the 3rd refrigerating unit 160, be provided with 1# deflector roll 401,2# deflector roll 402 successively; Described 1# deflector roll 401 and the 150 vertical settings of described second refrigerating unit, described 2# deflector roll 402 and the 160 vertical settings of described the 3rd refrigerating unit, and described 1# deflector roll 401 be arranged in parallel with described 2# deflector roll 402.
The unit that has continuous hot galvanizing and continuous annealing function described in the present embodiment, by simple modifications to existing zinc-plated unit, realize that it has continuous annealing and zinc-plated two kinds of functions, as shown in Figure 1, when realizing the continuous annealing function, mainly by described heating zone 100, fast cold section 110, thermotension roller chamber 120, manhole case 101, timeliness section district 300, recirculating air device for cooling 180, granulating unit 190, wiping arrangement 200, the continuous annealing that drying unit 210 constitutes completely, and its continuous annealing is provided with furnace roller completely, along band steel traffic direction with a lines arranged in form.
Wherein, described timeliness section district 300 comprises upper and lower 18# furnace roller, 19# furnace roller, 20# furnace roller, 21# furnace roller, 22# furnace roller, 23# furnace roller, 24# furnace roller, 25# furnace roller, 26# furnace roller, 27# furnace roller, 28# furnace roller and the 29# furnace roller that is provided with at interval successively.
Described 29# furnace roller and described 28# furnace roller be arranged in parallel, and described 29# furnace roller and described recirculating air device for cooling 180 vertical settings.Further, as shown in Figure 1, on the vertical line between described 29# furnace roller and the described recirculating air device for cooling 180, also be provided with the 30# furnace roller.
Described unit with continuous hot galvanizing and continuous annealing function, as depicted in figs. 1 and 2, between described thermotension roller chamber 120 and described timeliness section district 300, the 15# furnace roller is set, described 15# furnace roller and the 120 vertical settings of described thermotension roller chamber, and be arranged in parallel with described 18# furnace roller.
As shown in Figure 1, owing to need between described 18# furnace roller and described 15# furnace roller, to be provided with first refrigerating unit 140 and second refrigerating unit 150, so the space of certain distance need be set between described 18# furnace roller and described 15# furnace roller, and, between described 18# furnace roller and described 15# furnace roller, be disposed with first carrying roller 501 and second carrying roller 502 in order to realize normal transmission with steel.
Further embodiment as shown in Figure 2, can be provided with a cover tensiometer 610 in the 26th band steel transfer roller position in timeliness section district 300, is used to show the tension force size.And thermopair 601, thermopair 602 and the thermopair 603 that temperature-measuring range is 0～500 degree is set respectively at front portion, middle part and the rear portion of timeliness section district 300 timeliness sections, be respectively applied for the temperature of measuring timeliness section different positions band steel.
In addition, two cover pressure units can also be set at the lower region in timeliness section district 300 be respectively pressure unit 604 and pressure unit 605, as shown in Figure 2.Described pressure unit mainly is made up of load cell (being also referred to as pressure transmitter), metering circuit and process web member three parts.Physical pressure parameters such as the gas that it can be experienced load cell, liquid are transformed into the electrical signal (as 4 ~ 20mADC etc.) of standard, and secondary instruments such as indicator alarm, registering instrument, setter are measured to supply with, indication and process are regulated.
As shown in Figure 2, preferable, at timeliness section district 300 outlet units one plate temperature instrument 620 is set, be used for the displays temperature size.And in described recirculating air device for cooling 180, pressure unit 606 is set.
In this enforcement, as depicted in figs. 1 and 2, when realizing zinc-plated function, main zinc-plated all fronts that constitute by described heating zone 100, fast cold section 110, thermotension roller chamber 120, zinc pot 130, first refrigerating unit 140, second refrigerating unit 150,1# deflector roll 401,2# deflector roll 402, the 3rd refrigerating unit 160, the 4th refrigerating unit 170, recirculating air device for cooling 180, granulating unit 190, wiping arrangement 200, drying unit 210, and be provided with furnace roller in these zinc-plated all fronts, along band steel direct of travel with a lines arranged in form.
In the present embodiment, as shown in Figure 1, be provided with 3# deflector roll 404 in described the 4th refrigerating unit 170 outlet, described 3# deflector roll 404 and the 170 vertical settings of described the 4th refrigerating unit, and conveyer line is parallel on the lower end conveyer line that described 3# deflector roll 404 are set and the 30# furnace roller.
Further, as depicted in figs. 1 and 2, be provided with manhole case 101, be used for the mutual conversion between continuous annealing and the zinc-plated two kinds of functions in thermotension roller chamber 120 and 300 in timeliness section district.Be provided with seal cover board 102 in the described manhole case 101, described seal cover board 102 is used for blocking connecting the square hole that moves back the band steel exports when continuous annealing converts to when zinc-plated; Because the square hole that the band steel passes through when having a company to move back in the manhole case 101, so will block it to square hole with seal cover board 102 when zinc-plated, gas leakage must not be arranged, otherwise can influence furnace atmosphere, cause band rigidity energy bad.
Therefore the continuous hot galvanizing technical process of the utility model embodiment mainly comprises: uncoiling, degreasing, kink etc. → heating zone 100 → fast cold section 110 → thermotension roller chamber, 120 → zinc pot, 130 → the first refrigerating units, 140 → the second refrigerating units 150 → the 3rd refrigerating unit 160 → the 4th refrigerating unit 170 → recirculating air device for cooling 180 → granulating unit 190 → wiping arrangement 200 → drying unit 210 → levelling machine, straightener, kink, rolling etc.
And the continuous annealing process flow process of the utility model embodiment mainly comprises: uncoiling, degreasing, kink etc. → heating zone 100 → fast cold section 110 → thermotension roller chamber 120(only works the effect that turns to) → 15# furnace roller 400 → timeliness section 300(18# furnace roller → 19# furnace roller → 20# furnace roller → 21# furnace roller → 22# furnace roller → 23# furnace roller → 24# furnace roller → 25# furnace roller → 26# furnace roller → 27# furnace roller → 28# furnace roller → 29# furnace roller → 30# furnace roller) → recirculating air device for cooling 180 → granulating unit 190 → wiping arrangement 200 → drying unit 210 → levelling machine, straightener, kink, rolling etc.(annotate: the content that overstriking indicates is the distinct device and the technology of two units)
Tradition continuous zinc coating unit and continuous annealing unit are independently to separate, the utility model equipment unit is by 120 conversions in thermotension roller chamber, first, can be transformed into the 15# furnace roller and enter timeliness section district 300 again, thereby realize the continuous annealing function: second, can be transformed into the zinc pot and enter four refrigerating units more successively, thereby realize zinc-plated function.
In sum, unit with continuous hot galvanizing and continuous annealing function provided by the utility model, the simple modifications by to existing zinc-plated unit realizes that it has continuous annealing and zinc-plated two kinds of functions, improved the operating rate of unit, and the cost of can reducing investment outlay greatly.And the utility model is simple in structure, easy for installation, cost is low, space availability ratio is high, simple to operate, result of use good.
Should be understood that; application of the present utility model is not limited to above-mentioned giving an example; for those of ordinary skills, can be improved according to the above description or conversion, all these improvement and conversion all should belong to the protection domain of the utility model claims.
Claims (10)
1. unit with continuous hot galvanizing and continuous annealing function comprises heating zone that order is provided with, fast cold section, thermotension roller chamber, zinc pot, first refrigerating unit, second refrigerating unit, the 3rd refrigerating unit, the 4th refrigerating unit, recirculating air device for cooling, granulating unit, wiping arrangement, drying unit; It is characterized in that, be arranged in parallel the timeliness section district that is used for continuous annealing in described thermotension roller chamber and recirculating air device for cooling place.
2. according to the described unit of claim 1 with continuous hot galvanizing and continuous annealing function, it is characterized in that, described first refrigerating unit and second refrigerating unit, be arranged side by side with the 3rd refrigerating unit and the 4th refrigerating unit, and at described first refrigerating unit and second refrigerating unit, and be provided with interstice coverage between described the 3rd refrigerating unit and the 4th refrigerating unit, described timeliness section district is arranged in the described interstice coverage.
3. according to the described unit of claim 2 with continuous hot galvanizing and continuous annealing function, it is characterized in that, the continuous annealing that is made of described heating zone, fast cold section, thermotension roller chamber, manhole case, timeliness section district, recirculating air device for cooling, granulating unit, wiping arrangement, drying unit is provided with furnace roller completely, along band steel traffic direction with a lines arranged in form.
4. according to the described unit of claim 3, it is characterized in that, between thermotension roller chamber and timeliness section district, be provided with the manhole case, be used for the mutual conversion between continuous annealing and the zinc-plated two kinds of functions with continuous hot galvanizing and continuous annealing function.
5. according to the described unit of claim 3, it is characterized in that, between described second refrigerating unit and the 3rd refrigerating unit, be provided with 1# deflector roll, 2# deflector roll successively with continuous hot galvanizing and continuous annealing function; Described 1# deflector roll and vertical setting of described second refrigerating unit, described 2# deflector roll and vertical setting of described the 3rd refrigerating unit, and described 1# deflector roll and described 2# deflector roll be arranged in parallel.
6. according to the described unit of claim 2 with continuous hot galvanizing and continuous annealing function, it is characterized in that described timeliness section district comprises upper and lower 18# furnace roller, 19# furnace roller, 20# furnace roller, 21# furnace roller, 22# furnace roller, 23# furnace roller, 24# furnace roller, 25# furnace roller, 26# furnace roller, 27# furnace roller, 28# furnace roller and the 29# furnace roller that is provided with at interval successively; Described 29# furnace roller and described 28# furnace roller be arranged in parallel, and described 29# furnace roller and vertical setting of described recirculating air device for cooling.
7. according to the described unit of claim 6, it is characterized in that, on the vertical line between described 29# furnace roller and the described recirculating air device for cooling, also be provided with the 30# furnace roller with continuous hot galvanizing and continuous annealing function.
8. according to the described unit of claim 6 with continuous hot galvanizing and continuous annealing function, it is characterized in that, between described thermotension roller chamber and described timeliness section district, the 15# furnace roller is set, described 15# furnace roller and vertical setting the in described thermotension roller chamber, and be arranged in parallel with described 18# furnace roller.
9. according to the described unit of claim 6, it is characterized in that, between described 18# furnace roller and described 15# furnace roller, be disposed with first carrying roller and second carrying roller with continuous hot galvanizing and continuous annealing function.
10. according to the described unit of claim 1 with continuous hot galvanizing and continuous annealing function, it is characterized in that, the zinc-plated all fronts that are made of described heating zone, fast cold section, thermotension roller chamber, zinc pot, first refrigerating unit, second refrigerating unit, 1# deflector roll, 2# deflector roll, the 3rd refrigerating unit, the 4th refrigerating unit, recirculating air device for cooling, granulating unit, wiping arrangement, drying unit are provided with furnace roller, along band steel direct of travel with a lines arranged in form.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206226051U CN201873735U (en) | 2010-11-24 | 2010-11-24 | Unit with functions of continuous hot galvanizing and continuous annealing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206226051U CN201873735U (en) | 2010-11-24 | 2010-11-24 | Unit with functions of continuous hot galvanizing and continuous annealing |
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| Publication Number | Publication Date |
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| CN201873735U true CN201873735U (en) | 2011-06-22 |
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| CN2010206226051U Expired - Fee Related CN201873735U (en) | 2010-11-24 | 2010-11-24 | Unit with functions of continuous hot galvanizing and continuous annealing |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104264090A (en) * | 2014-09-28 | 2015-01-07 | 江苏大力神科技股份有限公司 | Zinc spangle controlling device |
| CN110385562A (en) * | 2018-11-07 | 2019-10-29 | 西马克工程(中国)有限公司 | Preheating section, eventually cold section of spray box processing method |
| CN112095061A (en) * | 2020-08-31 | 2020-12-18 | 广州Jfe钢板有限公司 | Production switching production channel and switching method for two different steel plate products |
| CN113293279A (en) * | 2021-05-31 | 2021-08-24 | 马鞍山钢铁股份有限公司 | Continuous annealing furnace outlet section structure and strip steel discharging and cooling process |
| CN113811627A (en) * | 2019-04-29 | 2021-12-17 | 法孚斯坦因公司 | Treatment line for the continuous treatment of metal strips with the dual purpose of producing annealed and dip-coated or uncoated strips, and corresponding cooling tower and method of switching from one configuration to another |
-
2010
- 2010-11-24 CN CN2010206226051U patent/CN201873735U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104264090A (en) * | 2014-09-28 | 2015-01-07 | 江苏大力神科技股份有限公司 | Zinc spangle controlling device |
| CN110385562A (en) * | 2018-11-07 | 2019-10-29 | 西马克工程(中国)有限公司 | Preheating section, eventually cold section of spray box processing method |
| CN110385562B (en) * | 2018-11-07 | 2021-07-16 | 西马克工程(中国)有限公司 | Preheating section and final cooling section spray box processing method |
| CN113811627A (en) * | 2019-04-29 | 2021-12-17 | 法孚斯坦因公司 | Treatment line for the continuous treatment of metal strips with the dual purpose of producing annealed and dip-coated or uncoated strips, and corresponding cooling tower and method of switching from one configuration to another |
| CN112095061A (en) * | 2020-08-31 | 2020-12-18 | 广州Jfe钢板有限公司 | Production switching production channel and switching method for two different steel plate products |
| CN113293279A (en) * | 2021-05-31 | 2021-08-24 | 马鞍山钢铁股份有限公司 | Continuous annealing furnace outlet section structure and strip steel discharging and cooling process |
| CN113293279B (en) * | 2021-05-31 | 2023-03-10 | 马鞍山钢铁股份有限公司 | Continuous annealing furnace outlet section structure and strip steel discharging cooling process |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110622 Termination date: 20141124 |
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| EXPY | Termination of patent right or utility model |