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The ITR HMM 060 hammer mill is a complete grinding plant installed on a detachable platform, equipped with an extraction conveyor belt. Despite being the smallest of the HMM series of mills

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Advantages and Disadvantages of Hammer Crusher: Advantages: big crushing ratio (usually 10-25, even can reach up to 50), strong production ability, uniform product size, less powder rate, low energy consumption, simple structure, light weight, easy operat. View Details Send Enquiry disadvantage hammer crusher. Disadvantages Of A Jaw Crusher

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For New InstallationsIf you dont currently have a washer/dryer machine in your RV, you will need to install a dryer vent so that you can vent the dryer outdoors. Its always a good idea to hire a professional for a task like this if youre not confident in your DIY skills since you will need to cut into the wall and through the exterior of your RV.Westland VID403A Deluxe Dryer Vent KitWhat Youll Need For The InstallationVent KitMounting Brackets for holding the unit in place4 Hole SawWhat If I Dont Want To Install A Vent?Maybe you dont have the space or dont want to cut a hole in the side of your camper. Whatever the reason, there are alternatives that you can consider which dont require venting.Its hard to beat the convenience of having the all-in-one solution of the washer/dryer combo, but if youre willing to hang dry your clothes you can avoid products that produce heat and use a spin dryer instead.Panda Spin DryerThe Panda Portable Spin dryer weighs 22 lbs and is essentially a standalone machine that does a washing machines spin cycle. If you hand wash your clothes with a non-electric mini washing machine, such as the Laundry Alternative Wonderwash, then you can use this machine to remove as much water from the laundry as possible to shorten drying time.Obviously, you will need to hang dry the laundry to complete the drying process, but this method doesnt generate heat, uses minimal electricity, and can be used in even the smallest RV or camper as long as you have a 110-120V power source.Another Possible Solution for an RVNow, if you want to flip this problem on its head, then you could get a portable washing machine that has a spin cycle. Once your laundry has been spun as dry as possible, you can hang it up just like with the spin dryer situation above, and this avoids having to manually wash your laundry.Giantex Portable Mini Compact Twin Tub Washing MachineThe Giantex Portable Twin Tub Washer has a wash capacity of 11 pounds, and a separate spin capacity of 6.6 pounds. Its powered by a standard 3-prong 110V plug. You run water into the washbasin with a separate hose or sink spray nozzle.Features:120V / 60Hz / 260w washing power and 140w spinner powerDimensions: 28.35 H x 14 W x 24.8 DMax Wash Capacity: 11 lbsWeighs 28 lbsSpinner RPM: 1300Check Current PriceThere are many possibilities when it comes to laundry in an RV, but the space you have available and the sacrifices youre willing to make are what ultimately decides what product best fits your needs. Without a doubt, an all-in-one solution like a washer/dryer combo is the most convenient long-term way of keeping your laundry clean on the road, but its one of the most expensive solutions weve outlined here.If youre in a smaller RV and usually rely on laundromats or machines at campgrounds, then maybe one of the simpler solutions is best for you for occasionally washing laundry on the road.Indoor Dryer Vent OptionsMost compact ventless dryers have a filter like the one shown below. Its inside the drum and acts as the first stage of filtration for the dryers exhaust, which helps to keep your ambient air clean.Dryer filter inside portable dryerDryer filter removed for cleaningThese filters usually need to be cleaned at least once a week, but this really depends on how frequently you use the dryer.Now, this isnt enough filtration to vent the portable dryer indoors. You will need to attach an indoor dryer vent to the dryers exhaust port. Weve got a few models shown below that will work with any dryer.We highly recommend the BetterVent Indoor Dryer Vent. You dont have to deal with adding water to the lint trap (or emptying it), as its merely a set of filters for the air to pass through. You will need to clean out the filters after every few loads.The Deflecto and Dundas models use a reservoir of water to trap lint. After every one or two loads, you will need to add water and possibly clean out the trap.BetterVent Indoor Dryer VentDoes not use water. Double filter system. Needs to be mounted vertically on wall; parts are included for installation.Check Current PriceReplacement FiltersCheck Current PriceThe indoor dryer vents below are alternatives to the BetterVent, and at the time this article was updated they were significantly cheaper. However, they use water to capture lint and some people find them more inconvenient to use than the BetterVent style dryer vent.Other Vent OptionsDeflecto Dryer Lint TrapUses water to capture lint. Transition duct, 2 clamps, and lint trap are included. Vertically mount on the wall; parts are included for installation.Check Current PriceRemember, these types of attachments do not get rid of the heat. If you live in an area with hot summer weather, then consider getting a dehumidifier to keep in the same room with your ventless dryer. Obviously, the smaller the dryer and the shorter the length of your drying cycle the less heat and humidity you will have to deal with.Dryer Comparison Tables by CapacityWeve grouped the dryers by the capacity of the drum, which is usually provided by the manufacturer in units of cubic feet. You might also see dryer capacity given by the maximum weight of a load.Choose a CapacityMore Info on Dryer Capacity and Size1.0+ Cu.Ft. Capacity Dryers2.0+ Cu.Ft. Capacity Dryers3.0+ Cu.Ft. Capacity DryersTop 120V Compact Washer/Dryer CombosMore Info on Dryer Capacity and SizeAll of the portable tumble dryers shown below have a 24-inch width. The larger capacity means the dryer as more depth and/or height.Taking measurements of the area youre going to install the dryer is your first task. Keep in mind the pipes and hoses as well. Generally, the standard exhaust vent is 4 inches in diameter. Dont forget to leave room for the door to open and close!The measurements we include in our product tables below:Overall Dimensions (WxDxH)Drum VolumeCapacity can also be shown in terms of the weight of the wet clothes being loaded. We include the drum volume when its provided by the manufacturers specifications, but if we cant find documentation, we will include the clothes weight if its provided.A good rule-of-thumb is you can fit about 3 lbs of wet laundry per cubic foot of dryer capacity.If youre considering a washer/dryer combo model, then keep in mind that theyre usually larger than a standalone dryer or washer. Among washer/dryer combos and the standalone dryers within the same capacity range, we typically see the height and depth (how far it sticks out from the wall) being the dimensions that account for their larger size. Once you pick a width that you can work with, start looking at height and depth.1.0+ Cu. Ft. Capacity DryersThere arent a ton of options in this size category, but these models have all the essential features and support ventless drying. Only the Panda comes with the ventless kit, but if you prefer the other models, the kit can be purchased separately. Overall we think the Panda is an excellent choice for the 1.0+ CuFt category.Magic ChefPandaCostwayDimensions (WxLxH)19.5" x 16.1" x 23.8"19.5" x 16" x 23.8"19.5" W x 16.5" D x 24" HBody Volume4.32 Cu. Ft.4.3 Cu. Ft.4.46 Cu. Ft.Drum Volume1.5 Cu. Ft.1.5 Cu. Ft.1.5 Cu. Ft.Wattage850850850Temp Settings444Cycle SettingsAdjustable TimerAdjustable TimerAdjustable TimerVentlessYes; Indoor Kit Not IncludedYes; Indoor Kit IncludedYes; Indoor Kit Not IncludedWeight37.5 lbs37.537.5Model#MCSDRY15WPAN725SF23598-CYPECheck Current PriceCheck Current PriceCheck Current PriceMagic ChefDimensions (WxLxH)19.5" x 16.1" x 23.8"Body Volume4.32 Cu. Ft.Drum Volume1.5 Cu. Ft.Wattage850Temp Settings4Cycle SettingsAdjustable TimerVentlessYes; Indoor Kit Not IncludedWeight37.5 lbsModel#MCSDRY15WCheck Current PricePandaDimensions (WxLxH)19.5" x 16" x 23.8"Body Volume4.3 Cu. Ft.Drum Volume1.5 Cu. Ft.Wattage850Temp Settings4Cycle SettingsAdjustable TimerVentlessYes; Indoor Kit IncludedWeight37.5Model#PAN725SFCheck Current PriceCostwayDimensions (WxLxH)19.5" W x 16.5" D x 24" HBody Volume4.46 Cu. Ft.Drum Volume1.5 Cu. Ft.Wattage850Temp Settings4Cycle SettingsAdjustable TimerVentlessYes; Indoor Kit Not IncludedWeight37.5Model#23598-CYPECheck Current PriceAll three of these models operate at the same wattage and can be vented indoors. In addition to the lent filter, there is an exhaust filter that must be cleaned as well. The exhaust filter helps make sure no lint makes it out of the dryer if youre venting it indoors.The heat generated by these models is similar to a small space heater of similar wattage. Its not too uncomfortable, and indeed is significantly less heat than a standard, full-size dryer. You can expect full loads to take 1.5 to 2.5 hours to completely dry, but this depends on the temperature setting you use, type of fabric, and wetness.The dry cycle settings for all three models are essentially the same. You get 4 different temperature settings with an adjustable timer.Cool (0-20mins)Warm (20-120mins)Hot (120-200mins)Air Dry (0-80mins)The times shown above are the timer settings youll want to use when drying a load to achieve the desired temperature. There are warmup and cooldown periods, so if youre going to dry a load in an hour, you will want to set it to one of the higher settings to make sure it dries at a hotter temperature than if you had just set the timer to an hour.One thing to be aware of is that you can overdry your laundry with a timed dryer. Many of the more sophisticated units, especially in the washer/dryer combo section below, have sensors that automatically detect the moisture level and heat within the dryer to determine when your laundry is finished. Youre not going to get that with these portable dryers. Its best to get an idea of how long a typical load takes and check the dryer around the 1.5 hour mark.If you have space, jumping into the 2.0+ CuFt category is recommended. You wont want to get the smallest possible dryer, but instead, see how much you can squeeze into your space.2.0+ Cu. Ft. Capacity DryersTable could not be displayed.The Panda PAN40SF is the model you saw in our tests earlier. We highly recommend this dryer and it includes the wall-mount brackets and only requires you to buy an indoor dryer vent if you plan on venting indoors.The features and settings on these three dryers are almost exactly the same; however, the Haier doesnt have an adjustment knob for the timed dry and instead has 5 different pre-programmed times.It may not be evident until you actually have one of these compact dryers in front of you and you start loading it that you realize how big the jump from 1.5 CuFt to 2.5 CuFt capacity really is. Drying large blankets is impossible for smaller dryers. Just to reinforce what was stated above, if you have the space to spare then get the largest compact dryer you can reasonably fit. Youll be thankful.3.0+ Cu. Ft. Capacity DryersMagic ChefPandaWhirlpoolDanbyCostwayDimensions (WxLxH)23.6" x 21.5" x 32.2"23.6" x 21.2" x 26"23.88" x 20.75" x 32.5"23.62" x 21.44" x 32.45"23.75" x 22.5" x 27"Body Volume9.46 Cu. Ft.8.45 Cu. Ft.9.29 Cu. Ft.9.5 Cu. Ft.8.35 Cu. Ft.Drum Volume3.5 Cu. Ft.3.75 Cu. Ft.3.4 Cu. Ft.3.2 Cu. Ft.3.21 Cu. Ft.Wattage 015001500Temp Settings34334Cycle Settings4Adjustable Timer3; Adjustable Timer47; Adjustable TimerVentlessOptional; Indoor Kit Not IncludedOptional; Kit IncludedOptional; Kit Not IncludedOptional; Kit Not IncludedOptional; Kit Not IncludedWall MountYes; Brackets IncludedYes; Bracket IncludedNoYes; Bracket IncludedNoWeight48.4 lbs48 lbs91 lbs57.3 lbs57.2 lbsModel#MCSDRY35WPAN60SFLDR3822PQDDY060WDB23047-CYWH-CSCheck Current PriceCheck Current PriceCheck Current PriceCheck Current PriceCheck Current PriceMagic ChefDimensions (WxLxH)23.6" x 21.5" x 32.2"Body Volume9.46 Cu. Ft.Drum Volume3.5 Cu. Ft.Wattage1500Temp Settings3Cycle Settings4VentlessOptional; Indoor Kit Not IncludedWall MountYes; Brackets IncludedWeight48.4 lbsModel#MCSDRY35WCheck Current PricePandaDimensions (WxLxH)23.6" x 21.2" x 26"Body Volume8.45 Cu. Ft.Drum Volume3.75 Cu. Ft.Wattage1500Temp Settings4Cycle SettingsAdjustable TimerVentlessOptional; Kit IncludedWall MountYes; Bracket IncludedWeight48 lbsModel#PAN60SFCheck Current PriceWhirlpoolDimensions (WxLxH)23.88" x 20.75" x 32.5"Body Volume9.29 Cu. Ft.Drum Volume3.4 Cu. Ft.Wattage1500Temp Settings3Cycle Settings3; Adjustable TimerVentlessOptional; Kit Not IncludedWall MountNoWeight91 lbsModel#LDR3822PQCheck Current PriceDanbyDimensions (WxLxH)23.62" x 21.44" x 32.45"Body Volume9.5 Cu. Ft.Drum Volume3.2 Cu. Ft.Wattage1500Temp Settings3Cycle Settings4VentlessOptional; Kit Not IncludedWall MountYes; Bracket IncludedWeight57.3 lbsModel#DDY060WDBCheck Current PriceCostwayDimensions (WxLxH)23.75" x 22.5" x 27"Body Volume8.35 Cu. Ft.Drum Volume3.21 Cu. Ft.Wattage1500Temp Settings4Cycle Settings7; Adjustable TimerVentlessOptional; Kit Not IncludedWall MountNoWeight57.2 lbsModel#23047-CYWH-CSCheck Current PriceThe Panda PAN60SF is one of the highest-rated models in this category, and from our experience with the PAN40SF we can say that the performance and quality are great for a dryer in this price range. You must purchase an indoor dryer vent if you want to vent indoors, just like the other models weve reviewed in this article.For a modest weight and size increase, you get quite a bit more capacity than with the PAN40SF, so if youve got the space to spare then getting the largest portable dryer you can fit is the best option.Top 120V Compact Washer/Dryer CombosWestland SplendideWestland SplendideEquatorLGDimensions (WxLxH)23.5" x 22.25" x 33.12"23.4" x 22" x 33.75"23.5" x 22" x 33.5"23.5" x 26" x 34"Drum Volume15 lbs Wash / 11 lbs Dry Capacity15 lbs Wash / 11 lbs Dry Capacity13 lbs Wash / 11 lbs Dry Capacity2.3 cu. ft.Temp Settings5555Cycle Settings13131414VentlessYes, CondensingYes, Indoor Vent Kit Not IncludedYes, CondensingYes, CondensingWeight148 lbs148 lbs157 lbs156 lbsElectrical120V, 10.5 Amps120V, 10.5 Amps120V, 13 Amps120V, 10 AmpsModel#WDC7100XCWD2100XCEZ4400NWM3488HWCheck PriceCheck PriceCheck PriceCheck PriceOne thing to keep in mind about washer/dryer combos is that theyre heavy. Significantly heavier than either a washer or dryer alone. That means your not going to be able to mount these on the wall.Many washer/dryer combos using ventless condensing technology for the dryer, but you can also get a standard heat pump as well such as the WD2100XC above.How does a condensing dryer work?Ambient air is pulled into the dryer and heated by a heating element, similar to a standard heat pump dryer, and hot air circulates the drum and evaporates moisture from the laundry. The hot and humid air is circulated through the condenser which cools it and water is collected under the condenser which is then pumped out of the drain hose. The drain hose can be put into the washer drain.This results in less humid air being exhausted into the room than with a standard heat pump and this method uses a less intense heat so that fabric isnt damaged.Now, if youre buying for an RV you generally dont want a condensing dryer. For such small living spaces, you dont want the dryer exhausting air back into the RV, so youll want to stick with a standard vented dryer like the Splendide WD2100XC.For an apartment, these are an extremely compact and efficient option if you have very limited space and no dryer vent connection, but youll need a drain for the washer and condenser function.Final ThoughtsWe would love to hear your thoughts and experiences with any of the dryers weve discussed above. What worked for your apartment or RV?Leave a comment below or contact us through email if you have any questions

The ITR HMM 060 hammer mill is a complete grinding plant installed on a detachable platform, equipped with an extraction conveyor belt. Despite being the smallest of the HMM series of mills

Advantages and Disadvantages of Hammer Crusher: Advantages: big crushing ratio (usually 10-25, even can reach up to 50), strong production ability, uniform product size, less powder rate, low energy consumption, simple structure, light weight, easy operat. View Details Send Enquiry disadvantage hammer crusher. Disadvantages Of A Jaw Crusher

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Plates IV.5 to IV.8 illustrate various hammer mills manufactured in both developed and developing countries. Table IV.3 indicates the physical characteristics of a selected number of hammer mills. IV.3 Stone mills In a typical stone mill, a conical or pyramid-shaped hopper holds the whole grain which enters the milling chamber through a feed valve. In some models, a shaking device and a screen prevent large impurities from entering the milling chamber. The milling of the grain is achieved by the shearing action of the flat surface of two millstones which are identical in size and construction. One stone is fixed to the milling chamber door while the other is mounted on a rotating drive shaft connected to an external energy source (e.g. an electric motor, diesel engine, or tractor engine). Figure IV.5 illustrates the basic design of a stone mill. The grain from the hopper is fed, through the central hole in the rotating stone, into the gap between the two stones. As the rotating stone moves against the stationary stone, the grain is ground as it travels from the centre to the periphery of the stones. The two millstones may be set either horizontally with a vertical rotary shaft, or vertically with a horizontal rotary shaft. The vertical type is more common. It is shown in figure IV.5. The diameter of the millstones varies according to model type and size. Generally, because of the weight of the stones and the relative difficulty in supporting them in an upright position, vertical millstones are smaller in diameter (20 to 56 cm) than horizontal millstones (61 to 71 cm). There are exceptions, however; some manufacturers produce vertical millstones of 71 cm and 81 cm diameter, while some horizontal millstones are only 30 cm and 41 cm in diameter. In the horizontal type, the crushed grain is moved to the periphery of the stones by centrifugal forces, whereas gravity assists the movement of crushed grain between the vertical millstones. Table IV.3 Characteristics of selected hammer mills produced by manufacturers listed in Appendix I1 Manufacturer Model Type of hammers Number of hammers Use/maintenance Power (hp) Rotation (rpm) Suggested engine2 Output (kg/hr) Cyclone attachment ALVAN BLANCH ESSEXMAJOR Reversible 3-10 100-300 ETS CHAMPENOIS REQUIN 4 24 Reversible* 7.5 3,000 E 500-1,000 COMIA-FAO BNT 4000 7.5-8-10 4,000 E, H 75-150 DDD PRESIDENT MM 6 Re-useable** 3 3,000 E, 3 60-100 MM/F 9 Re-useable** 2.5-3 3,000 E, 2.5 Z2 12 Re-useable** 5.5 3,000 E, 5.5 200-300 C2 24 Re-useable** 7.5 3,000 E 250-500 B 30 Re-useable** 10 3,000 E 300-800 MP 7.5,10 E 200-500 ELECTRA BABY Swinging 6 Reversible* 4.5; 7; 7.5 6,000 E: 4.5-7.5D: 14; P: 7.5 150-700 MINI Swinging 6 Reversible* 2-3 3,000 P VS1 6,000 H: 14 Yes GONRAD T20 Swinging 20 Reversible* 4-8 5,000 E, H Yes T24 Swinging 24 Reversible* 16-20 3,000 E Yes LAW HBU4 Swinging 4 4; 7.5 E 100-600 EF 7.5 3,000 E 250 Yes Centaures Swinging Welding 12,15,25 3,000 E 500-2,000 Yes HPB Swinging 4 6-15 100-600 B15C 5.5 3,000 E: 4kW 150-250 NDUMEE ND20 12-25 4,000 ND30 16-100 3,600 GM40 25-100 2,000-2,600 PROMILL B2L Interchangeable 2.3.4,5.5 1,500-3,000 B4C Swinging 12 7.5,10,15,20,25 3,000 RENSON BM12/55 12 Reversible* 5.5 3,000 E 100-500 A5 15 5.5 2,800 E 300 B10 24 7.5 E 500 C15 36 10 E 700 SECA ARGOUD ALPIN Swinging 6 Reversible* 4-5.5 6,000 P: 7.5D: 14 150-800 STOUT 27 Swinging 24 4 faces 3,000 400-1,500 EUROP 76 4 faces 5.5 3,000 E 600 Yes MIRACLE 71 4 faces 7.5 3,000 E, D 250-400 SKJOLD SB Swinging 16 Reversible* 4-10 3,800 E, D: 11 300 Yes AM2 Swinging 12 10-13 3,800 E, D 120-250 Yes BM2 Swinging 12 Reversible* 7.5-10 2,900 400 Yes TIXIER REIXITBM Swinging 15, 18 Reversible 5.5-7.5 3,000 E 150-700 TOY BA Swinging 5.5; 7.5; 10 3,000 150-500 T1 12 Reversible* 5.5; 7.5; 8-10 E, P, D Yes SACM PM 73 6 6,000 E, H 100-200 BU 69 10 4,500 E, H 150-300 D. SECK Fixed 6 Reversible 12 3,200 E, D SISMAR (SISCOMA) E, P, D 250-360 1 Source: GRET (1983) 2 Letters in this column designate the following engines: E for electric engines, D for diesel engines, H for heat engines and P for petrol engines. The numbers designate the capacity of the engine in hp. * 4 faces ** 3 faces Figure IV.5 Diagrammatic representation of a mechanical stone mill with vertical grinding stones Plate IV.5 Kusinja hammer mill The Kusinja maize mill is designed to be powered by diesel motors of between 10-20 hp, and the milling capacity will vary according to the power source. With a 10 hp motor, the capacity would be 150 kg/hr, with a 20 hp motor, 400 kg/hr.Price: US$1,280 Manufactured by: Brown and Clapperton (Malawi) Source: Commonwealth Secretariat (1981) Plate IV.6 Atom hammer mill The Atom maize mill is a small size hammer mill designed to be powered by a 5-7 hp diesel engine. It is fitted with reversible hammers, screens and sealed bearings. The average capacity is about 180 kg per hour. Manufactured by: Brown and Clapperton (Malawi) Source: Commonwealth Secretariat (1981) Plate IV.7 Manik hammer mill Manik grinding mills are especially useful for grinding maize. The mills are manufactured in 4 sizes. The hammers are reversible, and can be used on 4 different faces before replacement. Output: 90 to 1,100 kg per hourPower required: 8 to 60 hpPrices: US$370 to US$690 Manufactured by: Manik Engineers (Tanzania) Source: Commonwealth Secretariat (1981) Plate IV.8 Ndume power-driven hammer mill The Ndume hammer mills are especially suitable for grinding maize into meal. There are 5 models: the ND20, ND30 and GM40. The hammers are reversible and replaceable. From the mill housing, a fan blows the meal up into an overhead screened hopper. The ND20 has the lowest capacity and can be driven from small power sources of 12-25 hp. The ND30 has double the capacity of the ND20, and is fitted with a special overhead screen which allows oversize meal particles to fall back into the mill for regrinding. The ND30 can be driven from small power sources of 16 hp. The GM40 is specially designed for power take-off from tractors. Outputs: 200 kg to 950 kg per hourPrices: US$690 to US$1,300 Manufactured by: Ndume Ltd. (Kenya) Source: Commonwealth Secretariat (1981) The capacities of electric motors used in stone mills vary between 0.4 kW and 15 kW according to mill capacity and the diameter of the millstones. The motor capacity governs, in turn, the speed of rotation of the millstones within an optimum range of 600 to 800 rpm. The smaller diameter stones rotate faster than those of larger diameter. Thus, in a typical horizontal mill, the optimum rotation speed may be reduced to 400 or 500 rpm for stone diameters exceeding 61 cm. The output of ground material depends upon the capacity of the motor, the speed of rotation, the diameter of the millstones, the variety of the grain and the desired fineness of the ground material. The average output of a vertical stone mill is 80 kg per kW per hour, while it may reach 107 kg per kW per hour in a horizontal mill equipped with large diameter stones. Thus, the average hourly output of stone mills varies between 33 kg and 1,600 kg per hour, depending on the motor capacity, the position (vertical or horizontal) and diameter of the millstones, the type of grain and the required fineness of the ground material. Millstones are made out of one of the following materials: - natural stones; - small pieces of natural stones embedded in a matrix of cement or other suitable material. Other ingredients, such as emery, may also be added in the matrix; and - artificial stones made of emery or carborundum, or a mixture of the above two materials embedded in a matrix of magnesium oxychloride cement. The carborundum may additionally be heat-treated or vitrified to increase its durability. All types of millstones are usually enclosed within a supporting and protecting metal band. They are grooved to allow the shearing of the grain, as well as to assist the movement of the latter to the stones' periphery. The casing of most stone mills is made out of cast iron although some models are made with a wooden frame. A large number of developing countries manufacture stone mills for local use or for export to neighbouring countries. In many cases, the motor of these mills is imported. Plates IV.9 to IV.14 illustrate various types of stone mills manufactured in developed and developing countries, while table IV.4 provides the characteristics of a selected number of mills. IV.4 Efficiency of plate, hammer and stone mills A comparison of the efficiency of the plate, hammer and stone mills shows that hammer mills are generally better suited than plate or stone mills for fine grinding. A plate mill generally consumes more power than a hammer mill during fine grinding, especially with grain at high initial moisture content. Plate mills would therefore seem to be more expensive to operate. A more efficient use of plate mills requires that the grain be pounded before milling: this is unnecessary with the hammer mill. Cyclones fitted to the large hammer mills cool the mill parts and the ground material. Their provision in plate mills or stone mills is unusual. However, as an increase in the temperature of ground maize may impair its nutritional characteristics and shelf-life, manufacturers of stone mills recommend an optimum rotation speed of the millstones which should not be exceeded by more than 25 per cent. IV.5 Maintenance of plate, hammer and stone mills All types of mechanical grinders require regular maintenance if they are to perform the grinding operation efficiently at all times. All moving parts require lubrication on a regular basis (e.g. weekly). Most hammers, plates and millstones are reversible. Thus, they may be used for an extended period of time before sharpening, regrinding, dressing or replacement is necessary. Generally, the hammers need to be resharpened each week while the plates require regrinding every three to four weeks. Where excessive wear has taken place on some types of steel hammers, the tips can be returned to approximately their original dimensions by welding further metal. Using the correct materials, the new part may be made harder and thus more durable than the original. Natural stones wear more quickly than artificial stones and therefore need to be reversed or replaced more regularly. They are, however, cheaper to purchase. It should be emphasised that the life of the milling parts, whether hammers, plates or stones, will be prolonged if foreign matter of mineral origin (e.g. fragments of stone or metal or sand) are removed from the grain prior to milling. Table IV.4 Characteristics of selected stone mills produced by manufacturers listed in Appendix I1 Manufacturer Model Millstones Use/maintenance Power (hp) Rotation (rpm) Suggested engine2 Output (kg/hr)3 Material Diameter (mm) ABC HANSEN CO. DIAMANT Artificial stone 250-550 1 E or D6 to 30 FARMERS'FAVORITE Artificial stone 600,700 10 425 E or D6 to 30 600 BENTALL 200 L090SUPERB Cast steel 267 5 600 D: 11 250 ETS CHAMPENOIS CLB Cast steel 260 Reversible 4-6 850 E: 4, H: 4-6 60-180 NOVA Cast steel 160 Reversible 2.5-3 500-600 E: 3, H: 3 30 DIAMANT H4 Corundum 500 Re-sharpen 3-4 550-600 120 DIAMANT H6 Corundum 700 Re-sharpen 6-7 240 V.300 Bakelite or metal 300260 Replaceable 5.5-7.5 600-700 E 280-400 V.400 Vit. cor. 400 Replaceable 5.5-7.5 500-600 E, D, P 280-400 Metal 390 JUNIOR Hard cast steel 95 Reversible 0.5-7.5 100-125 E, H 25 COMIA FAO BA 318 Vitrified corundum 300 Non-interchangeable 4-6 750 E: 4, H: 5-6D, P 80 MB 317 Vitrified corundum Non-interchangeable 5-6 900 E: 5.5, H: 6 200 ECLIPSE B30 Corundum 300 4-6 700-750 150-350 DANDEKARMACHINE WORKS DS style Natural stone 160 6-8 E 250 DDD PRESIDENT Nr. 4/5/6/7 Natural stone 3-20 100-1,200 Nr. 4/5 GM Natural stone 5.5-7.5 R. HUNT & CO PREMIER 1A Steel 254 Reversible 4 600 D: 7 150 PREMIER 2A Steel 305 Reversible 6 600 D: 11 200 IRUSWERKE B/3/4/5/6 210-600 1.5-10 E 50-500 RM/2/3/4/5/6 210-600 2-10 E 50-500 RK/2/3/4/5/6 210-600 2-7.5 E 40-200 CR2/3/4/5/6 210-600 2-10 E, D 40-250 MOULIS(CRICKET) D4 Corundum 200-400 Non-revers. 2 E, P 100-400 RENSON & Cie LE MODERNE Corundum 300 4-5 400-600 E: 7.5,P; D: 7.5-11 200-300 AVIMAT Cast steel 90 .5 E: 5 60-120 SILEX 113 Corundum 6-8 E: 4 350-600 A320 Steel 320 4 750 600-1,000 SACM MF 75 6-10 800-1,000 E, H 250 SAMAP P220/380(horiz. stones) Stone 200 Interchang. 4 2,800 E 80-100 SECA ARGOUD C300 Corundum 300 2-5 350 E: 3 250-400 l/h D400 Corundum 400 4-8 350 E: 5 150-200 l/h B205 Vit. corund. 200 3-4 350 E: 3/4 100 l/h SICO GAUBERT JUNIOR 170 Cor./emery 200 1-2 450 E 50-200 SENIOR 170 Cor./emery 300 3 450 E 150-400 SIMON FRERES N2GCV Metal 218 1.5 85-200 NGC 51 Metal 250 2-4 200-400 SKJOLD KKE 16 6 650 D 300-400 TIXIER FRERES REIXIT M9CV Vit. corund. 250 3 700-800 150 REIXIT M10CV Vit. corund. 250 3 700-800 150-180 REIXIT M11CV Vit. corund. 300 5 700-800 200-300 REIXIT M12CV Vit. corund. 300 5 700-800 200-300 YAMAR Corundum 400-500 Corundum 600-700 1 Source: GRET (1983) 2 Letters in this column designate the following engines: E for electric engines, D for diesel engines, H for heat engines, and P for petrol engines. The numbers designate the capacity of the engines in hp. 3 Output in kg/hr unless otherwise stated. Plate IV.9 Horizontal stone mill Output: 120-150 kg per hourPower required: 3-4 hp Manufactured by: Etablissements Champenois (France) Source: FAO (1979) Plate IV.10 Stone mill fitted with natural stones Stone diameter: 400 mmOutput: 225-270 kg per hourPower required: 6-8 hp Manufactured by: Dandekar Brothers (India) Source: ITDG (1976) Plate IV.11 Modern stone mill Equipped with agitator feed from 35 litres capacity hopper.300 mm diameter grinding wheelsScrew adjustment for fineness of grinding.Output: 200-300 kg per hourPower required: 4-5 hp Manufactured by: Renson and Co. (France) Source: ITDG (1976) Plate IV.12 Kisan stone mill Stone mill for various grainsPower required: 1 hp electric motor Manufactured by: Kisan Krishi Yantra Udyog (India) Source: FAO (1979) Plate IV.13 R 2 grinding mill - Vertical millstones: 210 mm diam.- Power required: 2 hp- Output of fine grist: 100 kg/hr Manufactured by: Iruswerke Dusslingen (Federal Republic of Germany) Source: ITDG (1976) Plate IV.14 Diamant vertical stone mill - Special composition millstones- Constant feed rate from hopper to give uniform grinding- Millstone diameter: 300 mm to 500 mm- Output: 100 kg to 650 kg per hour- Power required: 2 hp to 10 hp Manufactured by: A.B.C. Hansen Co. A/S (Denmark) Source: ITDG (1976)

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