CN201128243Y - Efficient energy-saving hydraulic coal rod squeezer - Google Patents
Efficient energy-saving hydraulic coal rod squeezer Download PDFInfo
- Publication number
- CN201128243Y CN201128243Y CNU2007200653056U CN200720065305U CN201128243Y CN 201128243 Y CN201128243 Y CN 201128243Y CN U2007200653056 U CNU2007200653056 U CN U2007200653056U CN 200720065305 U CN200720065305 U CN 200720065305U CN 201128243 Y CN201128243 Y CN 201128243Y
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- hydraulic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
- B30B11/22—Extrusion presses; Dies therefor
- B30B11/30—Extrusion presses; Dies therefor using directly-acting fluid pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
- B30B11/22—Extrusion presses; Dies therefor
- B30B11/221—Extrusion presses; Dies therefor extrusion dies
Abstract
The utility model discloses a hydraulic coal column machine which includes a round cylinder, an extrusion device arranged in the round cylinder and a die arranged at the outlet of the round cylinder; the extrusion device is driven by a driving device; the driving device is a hydraulic driving device; the hydraulic driving device is controlled by a hydraulic system controller; the extrusion device is a piston arranged in the cylinder; the piston is driven by high-pressure hydraulic oil in a hydraulic oil cylinder and controlled by the hydraulic system controller to have reciprocating straight movement in the cylinder. With the working principle of high-speed and high-pressure extrusion of the hydraulic oil cylinder piston, the main working part for extrusion and shaping of the coal column machine is the hydraulic oil cylinder, which greatly reduces the diameter of the cylinder, greatly improves the production capability of the single machine, saves production space and machine maintenance cost for the users, effectively improves the production efficiency of the single machine and reduces the cost consumption.
Description
Technical field
The utility model relates to a kind of chemical industry equipment, particularly a kind of special equipment of fine coal system rod.It is applicable to each big-and-middle-sized chemical industry (nitrogen, phosphorus, potash fertilizer), steam power plant, smelting, pottery, coal gas enterprise fine coal system rod technology.
Background technology
Machine for producing coal bars is a kind of extrusion principle that utilizes, with the coal dust that is mixed with the sodium humate bonding agent equipment that is squeezed into coal, once in the early 1980s of extensive use in the small-sized nitrogen of China, phosphorus, potash fertilizer chemical enterprise.But because its output is little, efficient is low, the incompatibility large-scale industrial production is eliminated gradually.Along with rising steadily of current market lump coal price, each nitrogen, phosphorus, potash fertilizer chemical enterprise are heavily walked the road of the relatively low type coal gas of cost again one after another under the pressure of the pressure of surviving.The coal rod spiral squeezing type machine for producing coal bars machine type that is adopted has the spiral squeezing type machine for producing coal bars; forms such as pneumatic extrusion type machine for producing coal bars; the power of extruding of spiral squeezing type machine for producing coal bars is pushed fine coal by helical blade to discharge opening; because helical blade only has portion of energy to be converted into axial propelling movement power in rotary course; produce in the head place to extrude power limited; therefore the spiral squeezing type machine for producing coal bars only is provided with a circle extrusion cavities to guarantee the product quality of moulded coal on head usually; after the extrusion cavities wearing and tearing increase; the power of extruding descends; the briquette prod difficult quality is up to standard; need to change; usually head is a monoblock type, needs integral replacing.Though spiral squeezing type machine for producing coal bars separate unit production capacity strengthens greatly, power consumption is big, failure rate of machinery is high but still exist, defectives such as complete machine cost height, the consumable accessory consumption is big, production environment is abominable, as improvement to the spiral squeezing type machine for producing coal bars, the inventor has applied for Chinese patent ZL200620051837.X, high-efficiency energy-saving pneumatic extrusion type machine for producing coal bars, it has the little advantage of energy input.But energy-saving pneumatic extrusion type machine for producing coal bars promotes the compressed air of the motive force of cylinder from air compressor because of its extruding, and the maximum pressure that common cylinder can bear is in 1Mpa; Be subjected to the restriction of its pressure, the cylinder bore of the energy-saving pneumatic extrusion type machine for producing coal bars that production capacity is 3～4t/h reaches 600mm usually, and the cylinder bore of the energy-saving pneumatic extrusion type machine for producing coal bars that production capacity is 5～8t/h reaches 700mm usually; But be subjected to condition restriction such as the use material of cylinder and manufacturing and processing equipment, maximum gauge is big greater than the cylinder manufacture difficulty of 700mm, the cost height; And energy-saving pneumatic extrusion type machine for producing coal bars need be equipped with corollary equipments such as screw-rod air compressor, air accumulator and gs-oil separator, increased subscriber equipment cost and maintenance cost greatly.In addition, because its head is connected by gripping mechanism with cylindrical shell, gripping mechanism is two identical, semicircular mutually, as to have groove open-close type snap rings, head and cylindrical shell are respectively equipped with the boss rank and place in the groove of snap ring and be coaxial docking, two snap rings upper end is fixed on the cylindrical shell, the lower end detachably is connected into one and forms domain shape, and head and cylindrical shell are connected into one.This knot is still in its weak point, promptly because head is divided into left and right sides two parts, between left side head and the right head tens discharging sleeves are housed, for guaranteeing the correct assembling of discharging sleeve in the middle of left head and right head, the tolerance that requires pitch-row between the datum hole of left head and right head assembling discharging sleeve is ± 0.025mm, required precision is very high, its processing and assembling have been put forward very high requirement, general common metal cutting processing mechanical apparatus can't reach its requirement, need to adopt the processing of numerical control metal cutting processing mechanical apparatus, cause the processing cost height.
In sum, existing energy-saving pneumatic extrusion type machine for producing coal bars needs further to improve.
The utility model content
The purpose of this utility model is the deficiency at above-mentioned energy-saving pneumatic extrusion type machine for producing coal bars, a kind of high-efficiency and energy-saving type machine for producing coal bars is provided, and it has the advantage that unit production capacity is big, cost is low, floor space is little, corollary equipment is few, equipment cost is low and maintenance cost is low.
The technical solution of the utility model is: a kind of high-efficiency and energy-saving type fluid pressure type machine for producing coal bars, comprise circular cylinder body, place pressurizing unit in the circular cylinder body, be arranged at the head in circular cylinder body exit, pressurizing unit is driven by drive unit, described drive unit is a fluid pressure drive device, described fluid pressure drive device is controlled by the HYDRAULIC CONTROL SYSTEM device, described pressurizing unit is the piston that places in the cylindrical shell, and piston is driven, is controlled at by the HYDRAULIC CONTROL SYSTEM device and makes to come and go rectilinear motion in the cylindrical shell by the oil of the high-pressure and hydraulic in the hydraulic jack.
As to further improvement of the utility model, the inner surface of described circular cylinder body and the outer surface of piston are lined with wearing layer.
As to further improvement of the utility model, described wearing layer is a sodium rice super wear resistance composite.
As to further improvement of the utility model, described wearing layer is the hard chrome material of high-wearing feature.
As to further improvement of the utility model, described head is connected by gripping mechanism with circular cylinder body, the open-close type snap ring that the structure of described gripping mechanism is made up of two semicircles, the connecting bolt and the set bolt of the connecting plate by the snap ring upper part are fixed on the deck, again by the tightening plate and the bolted at position under the snap ring with unclamp.
As to further improvement of the utility model, described head is the combination head, is constituted by annular head that has flange and the discharge rod sleeve that has extrusion cavities that is arranged at its center.
As to further improvement of the utility model, extrusion cavities on the excellent sleeve of described discharge is 25 types, 3 circles, 30 types, 4 circles, 40 types, 5 circles, 50 types, 6 circles, 60 types, 7 circles, and being its quantity of the equally distributed extrusion cavities of hexagon is 19 on 25 types, 37 on 30 types, 62 on 40 types, 93 on 50 types, 130 on 60 types.
As to further improvement of the utility model, described HYDRAULIC CONTROL SYSTEM device is made up of oil cylinder, choke valve, solenoid directional control valve, overflow valve, cooler, pump, fuel tank, the empty filter of motor, net filter oil ga(u)ge, net filter, motor, pressure meter switch, Pressure gauge, counter and journey controller, and high-pressure and hydraulic oil is provided by the hydraulic oil pumping plant.
As to further improvement of the utility model, described pump is plunger displacement pump or gear pump or vane pump.
Operation principle of the present utility model is: primer fluid pressing system control device, and the hydraulic oil promotion oil cylinder by the output of HYDRAULIC CONTROL SYSTEM device drives piston and does high speed and high pressure compressional movement back and forth; To be mixed with the coal dust of sodium humate bonding agent simultaneously, enter in the cylindrical shell by feeding device, thereby make it under the effect of piston, going out the excellent sleeve hole of head extrudes from combination, formation has certain mechanical strength (from 2 meters high-altitude free-falling, 70% is not broken), the cross section is circular or quincuncial coal rod product.
The beneficial effects of the utility model are:
1, the utility model is compared with energy-saving pneumatic extrusion type machine for producing coal bars, owing to utilize the operation principle of hydraulic cylinder piston high speed and high pressure extruding, the main working parts of its machine for producing coal bars extrusion modling is a hydraulic jack, its operating pressure is 25～30Mpa, (cylinder bore of the energy-saving pneumatic extrusion type machine for producing coal bars that production capacity is 3～4t/h is 600mm to have dwindled the diameter of cylinder body greatly, and the cylinder diameter of the high-efficiency and energy-saving type fluid pressure type machine for producing coal bars that production capacity is 3～4t/h is 125mm), make unit production capacity improve greatly: energy-saving pneumatic extrusion type machine for producing coal bars has only 25 types, two kinds of types of 30 types, production capacity respectively is 25 types, 3～4t/h, 30 types, 5～7/h, high-efficiency and energy-saving type fluid pressure type machine for producing coal bars has 25 types, 30 types, 40 types, 50 types, five kinds of types of 60 types, separate unit production capacity respectively is 25 types, 3～5t/h, 30 types, 5～8/h, 40 types, 10～14t/h, 50 types, 18～23t/h, 60 types, 26～32t/h, for the user has saved a large amount of production sites and flight-line maintenance expense, effectively raise unit production efficiency and reduce cost consumption.
2, owing to adopt the HYDRAULIC CONTROL SYSTEM device, the user need not to be equipped with corollary equipments such as screw-rod air compressor, air accumulator and gs-oil separator again, has reduced the cost of investment of equipment and the maintenance cost of equipment effectively.
3, owing to utilize the operation principle of hydraulic cylinder piston high speed and high pressure extruding, the main working parts of its machine for producing coal bars extrusion modling is a hydraulic jack, its operating pressure is 25～30Mpa (operating pressure of energy-saving pneumatic extrusion type machine for producing coal bars cylinder is 1Mpa), thereby the coal that extruding is come out rod intensity is higher: the coal rod intensity of coming out from the head rod outlet reaches 480～520N, (energy-saving pneumatic extrusion type machine for producing coal bars is 360～420N from the excellent intensity of coal that the head rod outlet comes out only to need the air-dry back of 30～40 minute short time just can directly advance the stove burning, just can advance the stove burning after 2～3 hours time of need is air-dry), thus coal rod product quality and production efficiency further improved.
4, owing to adopted monoblock type combination head, simplified handpiece structure, reduced the processing of equipment and the requirement of assembling, general common metal cutting processing mechanical apparatus can reach its requirement, need not to adopt the processing of numerical control metal cutting processing mechanical apparatus, reduced processing cost effectively.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is a cross-sectional view of the present utility model;
Fig. 3 is a unit mahine header structure schematic diagram of the present utility model;
Fig. 4 is a HYDRAULIC CONTROL SYSTEM device fundamental diagram of the present utility model.
Among the figure: 1-makes up head, 1.1-go out excellent sleeve, 1.2-head, the 2-snap ring, the 3-gripping mechanism, the 4-cylindrical shell, the 5-feeding device, the 6-piston, the 7-hood, the 8-support, the 9-hydraulic jack, the 10-hydraulic control device, the 11-oil cylinder, the 12-choke valve, the 13-solenoid directional control valve, the 14-overflow valve, the 15-cooler, the 16-pump, the 17-fuel tank, the empty filter of 18-motor, 19-net filter oil ga(u)ge, the 20-net filter, the 21-motor, the 22-pressure meter switch, the 23-Pressure gauge, the 24-counter, the 25-journey controller.
The specific embodiment
Embodiment 1: a kind of high-efficiency and energy-saving type fluid pressure type machine for producing coal bars, as Fig. 1, Fig. 2, shown in Figure 3, form by pressurizing unit, cylindrical shell 4, feeding device 5, gripping mechanism 3, snap ring 2, combination head 1, hood 7, support 8 and HYDRAULIC CONTROL SYSTEM device 10; Combination head 1 is located at cylindrical shell 4 exits, square bucket-shaped feeding device 5 is located at cylindrical shell 4 tops, the diameter of cylindrical shell 4 is Φ 25cm (25 type), pressurizing unit is the piston 6 that places in the cylindrical shell 4, the outer surface of the inner surface of cylindrical shell 4 and piston 6 all is lined with sodium rice super wear resistance composite, combination head 1 is connected by gripping mechanism 3 and snap ring 2 with cylindrical shell 4, the open-close type snap ring 2 that gripping mechanism 3 is made up of two semicircles, the connecting bolt and the set bolt of the connecting plate by snap ring 2 upper parts are fixed on the deck, again by the tightening plate and the bolted at position under the snap ring with unclamp.Combination head 1 is constituted by annular head 1.2 that has flange and the discharge rod sleeve 1.1 that has extrusion cavities that is arranged at its center, and the extrusion cavities of discharging on the excellent sleeve is 25 types, 3 circles, and being its quantity of the equally distributed extrusion cavities of hexagon is 19 on 25 types.Piston 6 is driven by the oil of the high-pressure and hydraulic in the hydraulic jack 9 under 10 controls of HYDRAULIC CONTROL SYSTEM device, makes to come and go rectilinear motion in cylindrical shell 4; High-pressure and hydraulic oil is provided by HYDRAULIC CONTROL SYSTEM device 10; HYDRAULIC CONTROL SYSTEM device 10 is made up of oil cylinder 11, choke valve 12, solenoid directional control valve 13, overflow valve 14, cooler 15, plunger displacement pump 16, fuel tank 17, the empty filter 18 of motor, net filter oil ga(u)ge 19, net filter 20, motor 21, pressure meter switch 22, Pressure gauge 23, counter 24 and journey controller 25.Combination head 1 is connected by gripping mechanism 3 and snap ring 2 with cylindrical shell 4.
Embodiment 2: a kind of high-efficiency and energy-saving type fluid pressure type machine for producing coal bars, as Fig. 1, Fig. 2, shown in Figure 3, form by pressurizing unit, cylindrical shell 4, feeding device 5, gripping mechanism 3, snap ring 2, combination head 1, hood 7, support 8 and HYDRAULIC CONTROL SYSTEM device 10; Combination head 1 is located at cylindrical shell 4 exits, square bucket-shaped feeding device 5 is located at cylindrical shell 4 tops, the diameter of cylindrical shell 4 is Φ 60cm (60 type), and pressurizing unit is the piston 6 that places in the cylindrical shell 4, and the outer surface of the inner surface of cylindrical shell 4 and piston 6 all is lined with the wearing layer of the hard chrome material of high-wearing feature; Combination head 1 is connected by gripping mechanism 3 and snap ring 2 with cylindrical shell 4.The open-close type snap ring 2 that gripping mechanism 3 is made up of two semicircles, the connecting bolt and the set bolt of the connecting plate by snap ring 2 upper parts are fixed on the deck, again by the tightening plate and the bolted at position under the snap ring with unclamp.Combination head 1 is constituted by annular head 1.2 that has flange and the discharge rod sleeve 1.1 that has extrusion cavities that is arranged at its center, and the extrusion cavities of discharging on the excellent sleeve is 60 types, 7 circles, and being its quantity of the equally distributed extrusion cavities of hexagon is 130 on 60 types.Piston 6 is driven by the oil of the high-pressure and hydraulic in the hydraulic jack 9 under 10 controls of HYDRAULIC CONTROL SYSTEM device, makes to come and go rectilinear motion in cylindrical shell 4; High-pressure and hydraulic oil is provided by HYDRAULIC CONTROL SYSTEM device 10; HYDRAULIC CONTROL SYSTEM device 10 is made up of oil cylinder 11, choke valve 12, solenoid directional control valve 13, overflow valve 14, cooler 15, gear pump 16, fuel tank 17, the empty filter 18 of motor, net filter oil ga(u)ge 19, net filter 20, motor 21, pressure meter switch 22, Pressure gauge 23, counter 24 and journey controller 25.
The utility model comprises and not only is limited to above-mentioned embodiment, so long as adopt hydraulic jack to promote the version of piston extruding and discharging in cylindrical shell, all belongs to protection domain of the present utility model.
Claims (9)
1, a kind of high-efficiency and energy-saving type fluid pressure type machine for producing coal bars, comprise circular cylinder body, place pressurizing unit in the circular cylinder body, be arranged at the head in circular cylinder body exit, pressurizing unit is driven by drive unit, it is characterized in that: described drive unit is a fluid pressure drive device, described fluid pressure drive device is controlled by the HYDRAULIC CONTROL SYSTEM device, described pressurizing unit is the piston that places in the cylindrical shell, and piston is driven, is controlled at by the HYDRAULIC CONTROL SYSTEM device and makes to come and go rectilinear motion in the cylindrical shell by the oil of the high-pressure and hydraulic in the hydraulic jack.
2, by the described high-efficiency and energy-saving type fluid pressure type of claim 1 machine for producing coal bars, it is characterized in that: the inner surface of described circular cylinder body and the outer surface of piston are lined with wearing layer.
3, by the described high-efficiency and energy-saving type fluid pressure type of claim 2 machine for producing coal bars, it is characterized in that: described wearing layer is a sodium rice super wear resistance composite.
4, by the described high-efficiency and energy-saving type fluid pressure type of claim 2 machine for producing coal bars, it is characterized in that: described wearing layer is the hard chrome material of high-wearing feature.
5, by the described high-efficiency and energy-saving type fluid pressure type of claim 1 machine for producing coal bars, it is characterized in that: described head is connected by gripping mechanism with circular cylinder body, the open-close type snap ring that the structure of described gripping mechanism is made up of two semicircles, the connecting bolt and the set bolt of the connecting plate by the snap ring upper part are fixed on the deck, again by the tightening plate and the bolted at position under the snap ring with unclamp.
6, by the described high-efficiency and energy-saving type fluid pressure type of claim 5 machine for producing coal bars, it is characterized in that: described head is the combination head, is constituted by annular head that has flange and the discharge rod sleeve that has extrusion cavities that is arranged at its center.
7, by the described high-efficiency and energy-saving type fluid pressure type of claim 6 machine for producing coal bars, it is characterized in that: the extrusion cavities on the excellent sleeve of described discharge is 25 types, 3 circles, 30 types, 4 circles, 40 types, 5 circles, 50 types, 6 circles, 60 types, 7 circles, and being its quantity of the equally distributed extrusion cavities of hexagon is 19 on 25 types, 37 on 30 types, 62 on 40 types, 93 on 50 types, 130 on 60 types.
8, by each described high-efficiency and energy-saving type fluid pressure type machine for producing coal bars of claim 1～6, it is characterized in that: described HYDRAULIC CONTROL SYSTEM device is made up of oil cylinder, choke valve, solenoid directional control valve, overflow valve, cooler, pump, fuel tank, the empty filter of motor, net filter oil ga(u)ge, net filter, motor, pressure meter switch, Pressure gauge, counter and journey controller, and high-pressure and hydraulic oil is provided by the hydraulic oil pumping plant.
9, high-efficiency and energy-saving type fluid pressure type machine for producing coal bars according to claim 8 is characterized in that: described pump is plunger displacement pump or gear pump or vane pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200653056U CN201128243Y (en) | 2007-12-04 | 2007-12-04 | Efficient energy-saving hydraulic coal rod squeezer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200653056U CN201128243Y (en) | 2007-12-04 | 2007-12-04 | Efficient energy-saving hydraulic coal rod squeezer |
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| Publication Number | Publication Date |
|---|---|
| CN201128243Y true CN201128243Y (en) | 2008-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200653056U Expired - Fee Related CN201128243Y (en) | 2007-12-04 | 2007-12-04 | Efficient energy-saving hydraulic coal rod squeezer |
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| Country | Link |
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| CN (1) | CN201128243Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102358058A (en) * | 2011-10-11 | 2012-02-22 | 湖南力威液压设备有限公司 | Hydraulic coal bar machine |
-
2007
- 2007-12-04 CN CNU2007200653056U patent/CN201128243Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102358058A (en) * | 2011-10-11 | 2012-02-22 | 湖南力威液压设备有限公司 | Hydraulic coal bar machine |
| CN102358058B (en) * | 2011-10-11 | 2014-04-16 | 湖南力威液压设备有限公司 | Hydraulic coal bar machine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: CHEN ZHANGSONG Free format text: FORMER OWNER: WANG GUANGSHENG Effective date: 20100514 Owner name: CHEN LIYOU LIU DONGHUA |
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| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 412001 NO.2, ZHOUJIATANGSANHU, SHIFENG DISTRICT, ZHUZHOU CITY, HUNAN PROVINCE TO: 412000 NO.243, SHANGPING GROUP, YUETANG VILLAGE, BAITUTAN TOWN, LILING CITY, HUNAN PROVINCE |
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| TR01 | Transfer of patent right |
Effective date of registration: 20100514 Address after: 412000 Liling city of Hunan province Baitutan Town Group No. 243 Ping Village on the oak Patentee after: Chen Zhangsong Patentee after: Chen Liyou Patentee after: Liu Donghua Address before: Zhuzhou City, Hunan province 412001 Shifeng District No. 2 retail Zhou Jia Tang Patentee before: Wang Guangsheng |
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| ASS | Succession or assignment of patent right |
Owner name: HU'NAN XINXIANGNENG EQUIPMENT MANUFACTURING CO., L Free format text: FORMER OWNER: CHEN ZHANGSONG Effective date: 20101227 Free format text: FORMER OWNER: CHEN LIYOU LIU DONGHUA |
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| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 412000 NO.243, SHANGPING GROUP, LITANG VILLAGE, BAITUTAN TOWN, LILING CITY, HU'NAN PROVINCE TO: 412007 TIANTAI JINGU INDUSTRIAL PARK, HUANGHE SOUTH ROAD, TIANYUAN DISTRICT, ZHUZHOU CITY, HU'NAN PROVINCE |
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| TR01 | Transfer of patent right |
Effective date of registration: 20101227 Address after: 412007 Hunan province Zhuzhou city Tianyuan district the Yellow River road Tiantai Jingu Industrial Park Patentee after: Hunan Xin Xiang Neng Equipment Manufacturing Co., Ltd. Address before: 412000 Liling city of Hunan province Baitutan Town Group No. 243 Ping Village on the oak Co-patentee before: Chen Liyou Patentee before: Chen Zhangsong Co-patentee before: Liu Donghua |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081008 Termination date: 20151204 |
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| EXPY | Termination of patent right or utility model |