By Sanjeewa Dharmarathna - Understanding Mill Operation
Link to Pingle
Grinding by rollers instead of stones was started in Europe (Hungary) in the eighteenth century and the first flour mill was built using roller mills in England in the grinding zone or path in a roller mill is through a pair of rolls (usually porcelain in initial days). In spite of this grinding zone being shorter as well as it requires several repeated stages of grinding to achieve the same reduction, Roller mill became popular because of its grinding or milling efficiency.
ADVANTAGES OF ROLLER MILLS OVER STONE MILLS
· Smooth and continuous operation
· Better control over milling/grinding results
· Better yields of low ash flours/whiter flours
· Better separation of by-product (bran) from product
· Less power consumption for a given capacity
· Sophisticated and better safety controls
· No manual redressing only machine made flutes are used
· Better control over feeding, grinding and discharging
· Flexible in operation
· Less space requirement for a given capacity
· Less down time, easy maintenance and easy to operate.
· Bigger the capacity more the benefits
· Hygienic and safe products
Though the roller mill started with one pair of rolls in the earlier days, modern day roller mill will have two pairs of rolls as a standard design. Each pair of rolls formed as an independent unit and two such independent units are positioned back to back to form a modern day roller mill.
In this paper I am going to discuss in detail of every part of the roller mill in terms of design, maintenance, operation, future developments and advancements of roller body.
Modern day roller mill frames are made out of either mild steel or cast iron. And the main rolls are made of closed grain cast iron, centrifugally cast, deeply chilled on the outside to give a very hard and durable outer surface retaining its soft core. Importance is roller grinding helps for control grinding due to line contact rather than space contact in chakki mills.
These rolls are normally 250/300 mm diameter and run opposite to each other at differential speeds. The length of the rolls is usually 600 mm to mm. One of the main roll is driven by an electric motor using V belt or flat belt and this roll transmits the drive to the other roll using a set of gears or toothed belt.
Materials will meet at the nip of the two rolls. Through the nip angle, hand guard is provided for the safety of operator. Fabricated housing is provided as rigid enough to absorb vibrations and to optimize it, ribs and vibration pads are provided.
Top of the roller body, there is inspection glass, it helps to supervision the properties of incoming stocks. In addition to that it act as a buffer for mill balancing.
Common parts of a Roller Body
1. Break roll feed box
2. Feed inlet
3. Middle wall
4. Impulse transmitter
5. Feed gate segment
6. Feeding device
7. Break feed roll
8. Inspection window
9. Fast rotating break roll
10. Throw out lever
11. Hand wheel
12. Roll cleaning segment
13. Pneumatic conveying pipe
14. Product outlet
Different Types of roller bodies, Based on roll positioning
The roller mill contains two cylindrical rolls, rotating in an opposite direction with different speed. The arrangements of grinding rolls are horizontal, vertical or diagonal and parallel to each other. There are main three types of arrangement of rolls in roller body.
a) Horizontal roller positioning
b) Vertical roller positioning
c) Diagonal roller positioning
Horizontal position
In this arrangement of the rolls, the stock can directly fed into the grinding zone. The width of the roller mill is more and requires more floor space compared to the vertical or diagonal arrangement.
The advantages of this roller mill over others are:
The disadvantages are
Vertical position
This type of roller mill is unsatisfactory because of the even and steady stock feeding to grinding rolls is difficult. The guiding plate guides the product to the nip of the roll, the fine particles and flour tending to stick on the plate and influences the regular feeding. The ground stock leaving the rolls is difficult to reach for the sampling.
The advantages of this roller mill over others are
The disadvantages of this roller mill are
Diagonal position
This arrangement of rolls is in between horizontal and vertical position. The advantage is the reduction in the width of the machine as well as good feeding of the stock to the rolls without guiding plates. To achieve optimum grinding action the better diagonal angles lie between 28 and 55.
The advantages of this roller mill over others are
Though there is no specific disadvantage with this type of roller mill, modem day mechanisms of roll gap setting is more suitable for horizontal roll arrangement. Therefor horizontal roller arrangement is popular in worldwide.
Operation
The product is fed through the feed glass via distributor and it’s distributed over the whole length of feed rolls in a regular layer. The feed rolls supply the product from hopper into nip of rolls. The feed rolls are driven from a separate AC motor or V-belt fitted on roll (old). The gap between the rolls is adjusted according to the type of product and grain size. The rolls run on differential speed. The fast roll supported with bearing is fixed on the body whereas the slow roll supported with bearing is adjustable to achieve the rolls gap. The engagement and disengagement of the rolls is done with pneumatically or a hand lever (old). The roll cleaning is performed by brush or scraper. The product is taken out from discharge hopper after grinding. The provision for direct lifting with pneumatic system is also provided on customer's choice.
Feeding Mechanism in Roller bodies
It is extremely important to distribute the product over the entire roller length. During operation, particularly smooth roll, wear out faster, when there is no product in between them. They loose their dimness and hence the grinding efficiency drops.
The glass cylinder above the feed housing is used for a better supervision. The feed housing and the glass cylinder should be chosen as big as possible in order to provide for a free flowing of bulky products and to act as a buffer in case of building up to product. Most of the infestation can be found in the feed housing. Hence the same should be very easily accessible and cleaning should not be a problem.
The rolls are fed by the feed rolls and have separate drives for it with speed control device to regulate the stock to the pair of rolls. It is very important to distribute the stock evenly and over entire roller length during the operation.
The feeding system consists of the feed rolls and its type depends on stock. For the coarser stock, break passages, the rear shaft bladed worm is provided for the distribution of stock from center to both sides and front feed roll with different types of horizontal grooves are provided with certain spiral to feed the stock to the rolls. In break roll bodies, above the front feed roll, the adjustable feed gate is provided for the feed control.
In reduction roller passages and scratch passages, feed rolls are different than break roller bodies. Front feed rolls are provided with circumference grooves and back feed rolls are provided with horizontal grooves. In between two feed rolls, a plate is provided to hold the materials for some time. As well as feed gate is provided above the back feed rolls.
· B1 passage front feed roll has 3% spiral
· B2, B3, B4, front 2 flutes per cm to 3 flutes per cm with 4% spiral
· Reduction: back longitudinal grooves 8% spiral front 5 flutes per cm
The rate of stock entering the main rolls depends on the extent to which feed gate is open. The load sensors in the feed housing continuously check the rate of incoming stock and fluctuation in the rate is programmed to increase or decrease the rpm of the feed rolls.
The sensor element in the feed housing react upon fluctuation in capacity and transmit the force created by the product to the feed segment which intern open more or close. The bearing points of the feeding mechanism should work with as little resistance as possible. This is particularly important for light products such as coarse break stock from B4 or B5. Hence necessary attentions should be paid to the careful maintenance of these elements.
The feed roll speed regulator (four speed) is used to regulate the speed of the dosing feed rolls, to suit the kind of material and the quantity passing through the mill. Speed regulation can be most valuable, when quit different products are to be ground with the same roller mills. E.g. In combined mills (durum – soft wheat) of simply for reacting upon fluctuations in moisture of the wheat on the first break.
In old roller bodies, a lever mechanism is there to control the speed of feed rolls. Lever position “1” indicates highest speed and lever position “4” indicates lowest speed. Care should be taken to uncouple the feed rolls before changing over to another speed.
Advancement of feed rolls
Earlier gear system was there. 1, 2, 3 and 4. 1 is higher position, 4 is lower position.
But automation has developed for control the feed rate by changing feed roll rpm and feed gate adjustment. A separate VFD used AC drive motor is used for adjusting feed roll rpm. Sensors are provided inside the feed inlet to sense quantum of product incoming to roller body. According to that, feed roll rpm changes. Max changes can be happen 4-5%.
Break system and reduction system
Roller mill generally used in break system will have flutes or grooves on its surface for breaking the grain to release endosperm from the bran layers. Whereas the roller mill used in reduction system will have smooth surface for grinding the endosperm into flour. These rolls are provided with scrapers or brushes to clean the surface clean.
Fluted rolls for the break, Scratch passages and smooth rolls for the reductions passages are used. Both of them are identical except for their surface hardness (Brinell). Rolls that are casted by the normal way are getting softer each time they are re-fluted which is not desired. For this reason, high grade rolls are centrifugally casted using two different alloys. Outer layer is made up of chill casting of high density and wear resisting. The second layer consists of cast iron. The outer hard later has a thickness off approximately 15mm. These rolls maintain similar characteristics even after being re-fluted several times.
Rolls used in milling industry are hollow. The two axles are made of steel shaft with a conical seat (small taper) and pressed with a great pressure into the roll. By doing so, the roll has more material at its both ends than in the center section. On account of the grinding work roll gets wormed up and two ends are expanding correspondingly more. For this reason, smooth rolls are slightly tapered, Roll taper: Between 0.01 mm and 0.04 mm.
which differs according to:
Factors influencing the grinding action
The magnitude of grinding forces imposed on the grains during roller mill grinding varies according to the grinding conditions. The grinding conditions such as feeding stock, grain characteristics, differential of roll speed, gap between roll, roll surface and roll rpm influences the magnitude of each type of stress
a) Diameter and length
The roll diameter ranges from 252 to 300 mm in diameter mostly used commercially. The larger diameter rolls increase the grinding effect and are preferred for flaking operation. Small diameter rolls are preferred to minimize the compression in favor of more shear action. Most mills use standard size rolls of mm in length.
b) Flute profile
Flutes are the fine cuts into the surface of the roll. The flute consist of front face, back face, ground, and one land. The angle made by the front and back face to the depth of flute is called as front and back angle respectively. The cutting action of the flute increases as the angle decreases and depth of corrugation decreases as angle increases.
c) Spiral of flute
The angle of inclination of the flute to the horizontal line on the surface of the roll is called as a spiral. The spiral effects the cutting action and controls the grinding. The higher spiral increases the grinding action.
d) Disposition of roll
Rolls can be operated in four different combinations in the pair and it is known as a disposition of the roll. These four methods are
(A) Sharp to sharp,
Contact us to discuss your requirements of Wheat/Maize Pneumatic Roller Mill. Our experienced sales team can help you identify the options that best suit your needs.
(B) Dull to sharp,
(C) Sharp to dull and
(D) Dull to dull disposition.
When front face or back face of the flute involves in grinding, the action is called as sharp or dull respectively. In dull to dull deposition, the back face of the fast roll flute and back face of slow roll flutes are involved the grinding action. Similarly for sharp to sharp, the front face of the fast and slow roll are involved in grinding work. Dull to dull is least severe in action while as sharp to sharp is most severe of the four possibilities. Dull to dull action have more scrapping and less of cutting while sharp to sharp has more cutting and less scrapping action. Dull to sharp and sharp to dull has an intermediate effect on grinding.
e) Differential
The differential is the ratio between the speeds of rolls. The slow roll has the holding action against the fast roll. Differentials created the shearing force. The fast roll is driven by the motor, which drives the slow roll with gears, chains, or belts. The break rolls operated at the differential of 1:2.5 and reduction rolls 1:1.25.
f) Land
Land part of the flute is the portion of roll surface remaining between the two cut. The objective of land is to provide strength to the flute. It also controls the grinding action, too much land leads to reduced capacity of the roll. The land is expressed in mm or as a percentage of roll circumferences.
g) Revolution per minutes (rpm)
The circumferential velocity of the roll surface influences the capacity of the roll as the thickness of material in the grinding zone. Today’s roller mill with antifriction bearings runs at higher rpm (500 rpm). High rpm of roll produces more fine particles and power requirement increases as a square of the speed. It is advisable to run the roll at lowest rpm necessary to handle the capacity.
Influence of the roll surface to the grinding result:
Polished roll = little flour with low ash content
Matt-roll = more flour with normal ash content
Rough surface roll = more flour with higher ash content
Fine fluted roll = lot of flour with high ash content
Bearing of roller body
The main rolls are run on double row spherical roller bearings with grease lubrication. The gap between the rolls can be adjusted by moving the one roll precisely using hand wheels.
Positioning of the fast and slow rotating Roll:
In horizontal arrangement of the grinding rolls, any roll can be selected as fixed. Usually the inner roll is selected as fixed, because of the better adjustability of the outer roll. when front roll is movable, rod length can be kept minimum and the range of movability is more than back roll.
Two possibilities exist for the vertical and diagonal arrangements.
(a) The upper roll is fixed and fast rotating:
This is the most common arrangement, because the weight of the lower-adjustable roll and the grinding pressure (product pressure) are acting in the same direction, which provides for a stable roll clearance.
(b) The lower roll is fixed and fast rotating:
In this arrangement the weight of the upper-adjustable roll and the grinding pressure are acting each other (they could also become nearly equal) which results in a fluctuation of the roll clearance. If a hard foreign particle gets between the rolls, not only the spring tension has to overcome but also the weight of the upper roll. With this arrangement, a readjustment of the roll clearance has to be done more frequently.
Setting of grinder rolls:
The engaging and disengaging of the rolls can be done Electro pneumatically or hydraulically. From the product sensor in the feed housing, signal reaches the hydraulically or Electro pneumatically controlled piston which in turn engages or disengages the rolls. It is also possible to engage or disengage all the rolls from a control board by a push button or a computer software. This is particularly helpful when the mill is stropped and started at full lord, the automatic engaging and disengaging prevents the rolls being damaged. In case of an interruption of the product feed, the rolls remain in working position thus are damaged.
Roll drives
The roller mill is driven form a transmission shaft by flat belts (old) or by an individual motor with v belts. For direct drive, flat as well as v-belts can be used. Resent construction have the pulley embodied in the housing.
For producing the differential speed of the rolls, toothed belts, helical gears or chain wheels are used. The chain drives as well as the gears are partially immersed in an oil bath.
The problem behind the gear mechanism is, If the distance of the axles become smaller due to rolls re-fluting, one helical gear wheel must be changed. No change is necessary for the chain drive because the system can be adapted to the new conditions by a tension device.
Gear wheels (helical) of one tooth less is used after every 3 mm reduction in roll diameter. Maximum reduction of the roll diameter 12 mm i.e. 250 to 238 mm taper corrected helical gears. After reduction of 6mm in diameter replace the big wheel (58) by one with 56 teeth. Flank play 0.2 to 0.3 mm for all gear wheels.
Chain dive: No change of wheels required.
Rolls in Pilot plants
For mills with smaller capacities, particularly for school mills, roller mills with subdivided rolls can be built. The different passages are subdivided on the feed rolls, grinding rolls and at the outlet by partition walls. For the making it possible to flute subdivided rolls correspondingly for each passages separately, a circumferential groove of about 35 mm width has to be provided on the roll between the individual passages where the fluting tool stops or starts in order to facilitate the setting of the rolls, the diameter of the first break roll is 0.4 mm smaller than the one of the adjacent break roll.
Roll manufacturing process
The roll surface can be smooth or fluted with grooves to produce cutting or shearing action. Rolls are made of cast iron and rapidly cooled to harden the outer surface for longer life. Rolls are manufactured by centrifugal casting method and double pouring technique by spinning the mould, rotating around its axis, to hold the molten metal against the outer wall of the mould. Dense, heavy, molten metal is poured into the mould to form the hard outer wall, and then a softer, shock-absorbing molten metal is added. The outer chilled harden cast layer is about 10-15 mm. Actual grinding takes place in between two rolls and subjected the particle to shear and compression forces, generated by the corrugation on the roll surfaces and pressure by rolls while pulling the particles towards the nip of roll.
Forces on Rolls
There are two main types of forces between two rolls in roller bodies. Compression force and sheer force. When adjusting rolls, rolls get close each other, in that moment, compression forces act on each rolls. This compression force is responsible for cut open the grain as well as for reduction of particle size of endosperm.
Rolls rotate at different RPM in different pair of rolls. While one role rotates fast, other roll rotates slowly. For break rolls RPM ratio is 1:2.5 and for break rolls it is 1:1.25 in between pair of rolls. This different RPM of rolls forms sheer forces in between rolls. Sheer force is responsible for to scrape the endosperm from bran and germ.
Roll bearings
Either sleeve bearing or roller bearing are used. Roller bearing require less power (1.3hp) per pair than sleeve bearings (4.7hp) in empty run. Roller bearings require less maintenance and are extremely robust. For this reason, today this type of bearing is almost exclusively built-in.
The upper bearing body is solidly screwed on to the stand whereby the lower bearing is fixed onto a lever arm. Via this arm, the roll is engaged and the grinding gap is set. The movable bearing must be able to give way when a solid object gets between the two rolls. A tensioning spring is installed to absorb this abnormal, short timed pressure.
Removal of the roller bearing
Rolls are supported by the roller bearing at both the ends. Bearing may be straight or taper. Bearing that are mounted on the roll journal having straight bore can be removed by using bearing puller.
Bearing having taper bore are to be removed using “press off” device which is supplied along with the machine. This device is nothing but an oil injector with press of ring accessory. Before using this device for removal of bearing, shaft nut (lock nut) and securing plate are to be removed. Ring of the press off device is to be pushed on to the roll until the rubber socket fits into the milled portion on the journal. Screw at the opposite side of the journal is tightened. Piston pin in the injector is removed by unlocking the covering cap. Ordinary machine oil is poured, piston is placed back and top cover of the device is tightened. Oil is injected by turning the handle provided until bearing ejects from its seating.
Installing the roller bearing:
On the end of the axle place the dust-packing and bearing cover. Insert the bearing, securing plate and shaft nut (lock nut). Tight the locknut using the locknut-tightening device provided along with the machine, until a clearance of 0.035 to 0.045mm between the roller element and the outer race of the bearing. Rotate the rolls by hand and should run smoothly.
Roller surface:
Hardness measurement: Very hard ball (diameter 10mm) is pressed into the surface of the roll with Kg for 30 seconds. Diameter of the indent is measured and the hardness can be read from the table.
For fluted rolls 480 to 520 Brinell = kg/mm2
For smooth rolls 420 to 480 Brinell
Smooth rolls with polished (shiny) surface have a tendency to produce flakes and less flour, winding also might take place when the scrappers are not 100% perfect.
Surface treatment with oil and emery / quartz sand. Today it is sand blasted.
Advancement of roller body
Eight roller body, wide inlet, variable speed control of feed rolls, stable roll pack, maintenance free bearing, pneumatic engagement, and disengagement of rolls, automatic roll gap adjustment are the considerable advancements in today roller body.
Eight roller body
Reduce pneumatic lifting, reduce plansifter sections, reduce space, reduce maintenance, installment and operation cost, preventing moisture loss of the product, reduce power consumption.
Disadvantages are courser semolina production is not there, Ash content of the product is comparatively high. condensation can be happen in reduction passages.
Engage and disengage system
Sensors are provided inside the feed inlet. Sense the incoming product and according to that send signal to pneumatic engagement and disengaging system. Double acting piston’s action works on back fast and fixed roll to engagement and disengagement process. When piston received signals, it moves. According to movement, acentric pin move forward or backward. This acentric pin has connect with a bracket. Roll has fixed on that bracket. Due to series of movement of system, roll can be moved forward or backward. This process called pneumatic engagement and disengagement process
Sensor technology
Standard on the roller mills are automatic grinding gap adjustment and the online particle size measuring sensor. Temperature monitoring of the rollers and bearings also ensure maximum operating safety and high production uptime.
The Online particle size measuring sensor continuously measures the particle size distribution in the ground product and compares the measured actual value with the target value. The control system records the deviations and automatically adjusts the milling gap to the target value. The result is a consistent product quality with minimized energy consumption. The sensor-controlled milling gap adjustment automates this former manual procedure and enables millers to invest more time in their core tasks.
Temperature monitoring
In the new roller mill, the modern sensor technology not only checks the particle size but also the temperatures of the rolls and roll bearings. When contact pressure is too high, there is winding or dry running, causing the rolls to increasingly heat up. This can be prevented by constant temperature monitoring of the roller surfaces. Continuous measurement of the roll temperature ensures consistent product quality, particularly where there are few operators. Thanks to the temperature sensors in the roll bearings, wear and tear or lack of grease is recognized early. Preventive temperature monitoring of the rolls and roll bearings thereby ensures maximum operational safety and high finished product quality.
Speed, Easy Use, Safety and Precision, Sturdy frame, high grinding capacity
Similago II (model name) which is designed for high, continuous and consistent grinding of cereals such as wheat, maize (corn), rye, spelt, barley and sorghum ensures a consistent grind thanks to the a uniform feed rate across the grinding rolls. The steel used in the machine is a special quality high carbon steel. The bearings and the grinding rolls are directly mounted on to the frame. The sturdy construction gives the roller body the ability to perform high capacity grinding. The internal product contact parts are made from stainless steel which also stops the adhering and accumulation of the product and condensation.
With new generation roller body, easy and fast change of the rolls can be performed in 20 minutes. No special tools or lifting devices are required as the standard tools can perform easily.
The grinding rolls are mounted on self-aligning double row roller bearings which are housed in 25 mm thickness housing. Roll temperature is kept low by the air circulation provided by the aero dynamic design of chamber structure. The universal frame allows the use of grinding rolls with either a diameter of 250 mm or 300 mm.
The feed roll speed is controlled automatically by the capacitance sensor in the feed box which sends a signal to feed roll drive motor invertor via a PLC according to the product level in the feed box. No calibration is required. This ensures a perfect and uniform product feed to the grinding rolls.
The poly carbonate inspection glass on the feed box can be easily removed from the outside without the need to dismantle the feed spouts and related parts, for cleaning. For inspection purposes, double walled inspection door which can be opened and closed easily due to a weight system avoiding the use of latches. This enables the doors to be dismounted / mounted to from the machine without the use of fasteners.
A user friendly touch screen operator interface panel between the operator and microprocessor which is mounted on both sides allows the continuous and changing and monitoring of all the operating parameters together with alarms and graphical system visualization. New Generation roller body which was developed after all the details were revised meticulously promises speed, easy use, safety, hygiene and precision in addition to its stainless steel structure and innovative design.
Superior time Roller use of Centrifugal impactor
One of the most outstanding innovations in the recent time is Superior Time roller.
The new Superior Time roller body breaks down medium and fine durum wheat and regrinding passage plates. The breaking down action, obtained through knocking, increases productivity and at the same time improves yield and the degree of water absorption in the flour. Internally manufactured in stainless steel, it is characterized by a flat rotor, with 3 series of screwed in pins to break up the plates. The rotor is dynamically balanced and fitted on the motor shaft. It can be assembled on the floor or suspended from the ceiling.
Easy Roll Adjustment, Less Waiting Time, Easy Use - Multimilla machine
It is possible to make roll gap & paralleship adjustment easily with the accurate gravity indicators. Roll cleaning brushes and knives can be adjusted easily and high-degree roll cleaning can be obtained.
With central greasing system, it is possible to grease roll housings without stopping the roller mill which decreases the idle time. While the electric cabinet provides Easy access to high quality electric and electronic components isolated aluminum product control gate provides light weight and easy to use, noise-free and heat-free product control gate.
Control panel with high isolation in Multimilla enables easy access and control of all parameters to control the roller mill. Touch-screen panel is also available on request. Safety locks prevent unauthorized access to dangerous places the gates designed with safety locks to secure working environment. The cycle of feeding rolls are regulated automatically by invertor controlled gear motor. Along with automatic inverter control, the feeder rolls cycle is regulated manually by digital setting device.
Single time belt system with long life provides easy montage and dismantling. Belt sizes for all roller mill types and cycle are standard. Pneumatic control system of Multimilla consists of strong and durable component. As it is maintenance free it is easy to montage and dismantle. Strong disc sprigs enables optimum roll grinding pressure for a constant roll space and provides high milling quality.
Taper bush pulleys provide easy montage and dismantling and longer lifespan. Sphero-cast roll housings have enduring and durable housings. Aluminum housing covers prevents high temperature due to their special structure. Eccentric belt tension system is easy to adjust belt tensioning system.
The main chassis is made of gray cast iron, increasing resistance and durability as well as absorbing the vibration and shocks.
Feeding rolls housing and roll covers are made of high-resistant aluminum extrusion profiles with bolt-connection method. Thanks to the feedıng roll packs wıth lınear ball bearıngs, it is possible to obtain easy cleaning for the back of feeding rolls which enables maximum hygiene at minimum time. Feeding roll cycles are adjusted automatically by means of special level probes. Easy access and fast cleaning and maintenance with the completely-openable front cover.
Adjustable pneumatic system in the machine creates negative pressure around the rolls and provides dust absorption. In addition, dusty air is evacuated from the inlet hopper to the outlet hopper by using pneumatic system. Changing grinding rolls in the machine takes only 20 minutes, thanks to completely dismantle grinding group which minimizes the idle & stop time of mill and creates time for an efficient production.
LEONARDO 02 - Maximum energy saving, high performance
With the new LEONARDO 02, the mechanical project begins with uninnovative roll drive unit. Each roll will be driven by mean of a coaxial directly coupled electric motor. This drive will have modular and variable speed; will be belt free, therefore with highest energy efficiency. The motor stator will fitted on the machine frame while the rotor will be coupled with the rolls shaft. This arrangement will provide a unique saving ensuring both the highest milling performance and the highest power saving.
The power consumption of the Leonardo 02 roller mill will be 30 % compared with the conventional roller mill belt drive mechanism. It is thought that the 30 % power saving will create a high impact on the flour production costs reduction and will allow to get access to government funds for improving the energetic efficiency of the milling plant.
The newly developed drive arrangement will avoid the need of V and toothed belts , pulleys , motor chairs and machines floor fixtures such us Single Shaft motor suspension. This will cause not only a saving on the material and cost of the machine itself, but also on the required installation time. The absence of belts will definitely kill the need of wearing spares and the maintenance costs as well. Although the overall dimension of the machinery is equal to the conventional one both the additional saving on the number of building floors and Sensible noise reduction is reached.
Want more information on Pingle Group Wheat Flour Milling Machine? Feel free to contact us.