Mepu K-SERIES Manual de usuario

MEPU Oy

Mynämäentie 59, 21900 Yläne, Finland

p. +358(2) 275 4444, [email protected]

www.mepu.com

K-SERIES MOBILE DRYER

OPERATING MANUAL

M180k, M205k, M240k, M275k, M300k, M365k and M420k

ID: D00125-2019_EN Rev.A

D00125-2019_EN 1

TABLE OF CONTENTS

1FOREWORD...............................................................................................................................3

1.1 WARRANTY AND WARRANTY TERMS ......................................................................3

2Important information for mobile dryer operators.......................................................................4

3Basics of grain drying..................................................................................................................5

4Technical specification of the mobile dryer.................................................................................6

4.1 Hopper and feeding auger conveyor....................................................................................7

4.2 Elevator................................................................................................................................7

4.3 Pre-cleaner and spreader......................................................................................................7

4.4 Grain bin ..............................................................................................................................7

4.5 Drying cells..........................................................................................................................8

4.6 Exhaust air cases and exhaust air aspirators ........................................................................8

4.7 Feeding apparatus ................................................................................................................8

4.8 Bottom trough, and bottom aspirator, sampling unit.........................................................10

4.9 Dryer furnace .....................................................................................................................10

4.10 Electrical equipment ..........................................................................................................10

4.11 Frame .................................................................................................................................10

5Deploying and positioning of a mobile dryer. ...........................................................................11

5.1 Mobile dryer deployed indoors..........................................................................................11

5.2 Power supply......................................................................................................................12

5.3 Electrical switchboard........................................................................................................13

5.4 Oil.......................................................................................................................................16

5.5 Smokestack ........................................................................................................................16

5.6 Dryer furnace .....................................................................................................................17

6Operating the dryer ....................................................................................................................19

6.1 Filling the dryer..................................................................................................................19

6.2 Drying ................................................................................................................................20

6.3 Emptying the dryer.............................................................................................................21

6.4 Dryer settings.....................................................................................................................22

6.4.1 Setting the filling delay..................................................................................................22

6.4.2 Cooling timer................................................................................................................23

6.4.3 Work/ pause time relay................................................................................................24

6.4.4 Setting the burner thermostat.....................................................................................25

6.4.5 Setting of the drying thermostat.................................................................................26

6.4.6 Setting of the feeding apparatus.................................................................................27

6.4.7 Setting of the pre-cleaner aspirator............................................................................27

6.4.8 Setting the spreader disc..............................................................................................28

6.4.9 Setting the air flow rate...............................................................................................29

6.4.10 Drying of partial batches.............................................................................................30

6.4.11 Cleaning the central channel after drying a partial batch.......................................32

6.5 Drying of different grain varieties .....................................................................................32

6.6 Aspects to be noted in respect of hot air dryers.................................................................32

7Maintenance...............................................................................................................................33

8Malfunctions ..............................................................................................................................35

D00125-2019_EN 2

9Concise operating instructions...................................................................................................37

9.1 In the beginning of the drying season make the following checks....................................37

9.2 Filling.................................................................................................................................37

9.3 Drying ................................................................................................................................37

9.4 Emptying............................................................................................................................38

9.5 After the drying season ......................................................................................................38

10 Technical data ............................................................................................................................39

11 User settings...............................................................................................................................42

12 Declaration of conformity..........................................................................................................44

3 D00125-2019_EN

1FOREWORD

This Manual contains instructions for operating a K-series mobile dryer.

Before starting to use the dryer please read the Manual carefully, and familiarise yourself with the

operations and precautions, in order to ensure that you use the unit efficiently and safely.

Keep this Manual at hand, and review it always with any new employees. If you need additional

information or help, please call your machine dealer or the Mepu Oy service number.

1.1 WARRANTY AND WARRANTY TERMS

This product is intended for professional use. Installation, operating and maintenance of the

equipment presumes general skills and understanding of machinery and equipment, which a

professional farmer is expected to have.

The warranty period is one (1) year in agricultural use. The warranty period starts from the

delivery of the product. The warranty period for the furnace and the heat exchanger is seven

(7) years.

The warranty does not cover any damages caused by misuse or any other damages resulting

from the same.

The warranty covers faults caused by poor workmanship and materials. Damaged parts are

repaired or replaced with serviceable parts. If however it is established that the damage is

not covered by the warranty, we shall charge for any expenses connected with the same.

Warranty repairs do not extend the warranty period.

The warranty does not cover consequential damages, resulting losses, lost profit, shipping

costs, travel expenses, down time, modification of the original structure of the equipment or

any other economic losses.

The warranty shall apply in the event that the equipment has been installed, operated and

maintained observing the instructions of the manufacturer and any effective regulations.

The warranty does not cover premature wear or damage of parts resulting from negligent

maintenance.

Any matters related to warranty and possible expenses have to be pre-agreed with Mepu Oy before

performing any repairs.

4 D00125-2019_EN

2Important information for mobile dryer operators

Avoid falling down

After having installed the grain silo fasten the ladder and back rails as well as the roof

guardrails. Be particularly careful when working on the roof in rain, or if the roof is

covered with ice.

Disconnect the dryer power cable from the network when you:

-Remove protective covers to carry out maintenance or adjustment work.

-Clean the bottom part of the elevator or the auger conveyor channel.

-Adjust the tension of the elevator chain or the conveyor V-belts.

-Go into the grain silo to adjust the spreader disc.

-Open the burner for maintenance.

Fire hazard; make sure that the dryer and its surroundings are clean

-The discharge pipes of the pre-cleaner and the bottom aspirator must be led

sufficiently far from the dryer, and preferably take them via the cyclone to the

debris bin. The air sucked into the furnace must be absolutely clean.

-Damp and partially dusty air from the side air channels must be led sufficiently

far away from the dryer, so that it is not mixed into the furnace intake air.

-Mixing exhaust air with furnace intake air significantly reduces drying efficiency.

-It is advisable to check the cleanliness of the internal bottom of the furnace and

the exhaust air channels every 100 hours. Moreover, at the end stage of every

grain batch being dried, open the discharge lever, which is situated between the

feeding apparatus and the elevator at the back of the dryer.

Avoid oil spills

Having adjusted the burner pressure make absolutely sure that you have closed the

pressure gauge tap. If the tap is left open the pressure gauge can be damaged and fuel

oil could spill into the environment. Protect the oil hoses between the oil tank and the

burner such that they cannot be damaged by moving objects or people around the

dryer.

Additional lighting

The drying season is at the end of summer, when evenings and nights are already dark.

Therefore make sure that there is sufficient additional lighting around the dryer to

ensure work safety.

Filling and emptying of the dryer

When you fill or empty the dryer make sure that no bystanders are threatened by the

risk of being run over by the moving units or get crushed between the trainer and the

hopper.

Extinguishing equipment

During the working season there must be a 12 kg ABE-3 type fire extinguisher on the

dryer.

Operating instructions

Remember to read the operating instructions before installation of or operating the

unit.

5 D00125-2019_EN

3Basics of grain drying

The keeping quality of harvested grain depends on its moisture content and the grain temperature

achieved by the method of storage. Under the conditions in Scandinavia and the northern

hemisphere, the moisture content of grain after harvesting varies typically between 15–45%, which

requires taking measures to improve the keeping quality of grain. The climatic conditions in the

northern hemisphere prevent from achieving sufficiently low moisture content figures if just natural

drying processes are used. During the harvesting season the relative air humidity can reach as high

as 80–90%. Thus drying methods where no auxiliary equipment is used cannot produce low

moisture contents. Therefore grain has to be handled applying various methods in order to improve

its keeping quality. The established handling methods include various drying techniques and –in a

smaller scale –freezing of grain.

The functioning of dryers is based on strong air flows circulating through the grain batch being

dried, and subsequently discharging the air into the atmosphere. Dissipation of moisture can be

facilitated by increasing the temperature of the grain being processed. The homogeneity of drying

quality can be increased by circulating and cooling the grain during the drying process.

However, there are certain basic rules involved in the drying process, which should be observed to

prevent drop of grain properties, such as germinative capacity or baking properties. The most

important aspects that need to be monitored are grain temperature, circulation rate and air flow.

These values vary by individual grain types and the case-by-case temperature settings must be

determined through experience. The values are also affected by some dryer-specific aspects.

Approximate drying air temperatures:

Seed grain 50 … 60o C

Bread grain 60 … 70o C

Fodder grain … 80o C

Recommended grain temperature:

Below 45o C … germinative capacity drops

If drying is carried out in hot weather, make sure that the grain is circulated and dried property in

order to avoid overheating.

6 D00125-2019_EN

4Technical specification of the mobile dryer

7 D00125-2019_EN

4.1 Hopper and feeding auger conveyor

Grain is loaded into the filling hopper equipped with a bottom conveyor, which feeds

grain to the elevator. In rubber flap elevator models, the feeding auger conveyor

features a manual disconnect switch, which allows disconnecting the auger conveyor

from the rest of the removal equipment for the time of drying. The standard filling

hopper is a 1.3m3 longitudinal hopper, which allows to dump the grain from the side,

either from right or left. In bucket elevator models, the feeding auger operates with its

own motor.

4.2 Elevator

Mobile dryers equipped with a rubber flap elevator:

Grain is lifted to the top of the dryer with a chain elevator. There is a 2-way divider at

the top of the elevator, which allows feeding the grain either into the pre-cleaner and

from there into the dryer, or into the discharge pipe. The bottom conveyor of the dryer

is also powered by the elevator motor.

In a smaller model (180), the top of the elevator can be turned town to reduce the

transport height.

Mobile dryers equipped with a bucket elevator:

The elevator is the Skandia bucket elevator featuring steel buckets. In this case the

bottom conveyor is always equipped with its own motor.

The bottom trough under the bottom cone is equipped with a rotation sensor. The

rotation sensor stops the unit when the dryer gets clogged.

4.3 Pre-cleaner and spreader

From the elevator, grain flows directly along the trough into the pre-cleaner, from

where the grain will move directly to the

spreader. The task of the motor-driven spreader

disc is to spread the grain evenly throughout the

grain bin. The vertically adjustable spreader disc

is connected to the top conveyor via a bevel gear.

4.4 Grain bin

Moist grain swells when its temperature rises.

When the drying process progresses the volume

of grain is reduced significantly. The grain bin of

the mobile dryer is optimised to function under

any conditions. The purpose of a large grain bin is

to act as a buffer when the grain level varies,

which happens due to pre-cleaning and drying of

the grain.

Guardrails and the access platform included in the standard delivery are attached to the

top of the grain bin. There is an inspection hatch at the rear of the bin, which is used to

monitor the dryer filling process. The standard delivery set also includes a rotating

level guard, which stops the filling process when the dryer is full. The manhole on the

roof gives access into the bin for adjusting the spreader disc or cleaning the insides of

the grain bin.

8 D00125-2019_EN

4.5 Drying cells

The drying cells have many air ducts. The drying process is uniform, because air is

blown into the central channel between the drying cells, from where moist air is

discharged through the drying cells towards the sides into the exhaust air cases. In the

rear part of the central channel there is a cleaning/ inspection hatch. There are shutters

preventing air flow installed between the cells for drying of partial batches.

4.6 Exhaust air cases and exhaust air aspirators

The task of the exhaust air cases is to collect the humid air from the drying cells, which

is then lead through the exhaust channels towards the sides of the dryer. One of the

exhaust channels features a thermostat that measures the exhaust air temperature. The

digital display of the thermostat is located in the electrical switchboard.

The exhaust air aspirators for the exhaust air cases are available as optional equipment.

The aspirators serve to reduce condensation of moisture in the exhaust air cases. The

aspirators also improve ventilation inside the dryer.

4.7 Feeding apparatus

During the drying process grain flows from the rotating feed rollers evenly down into

the conical base. There are six speed rollers in the dryer. At both ends of the feeding

apparatus there are movable hatches for cleaning the feed rollers.

The volume of the feeding apparatus is 0.81 cubic metres. The shafts feature with ball

bearings at each ends, and a nylon sliding contact bearing at the centre. There is a

hatch underneath each feed roller, which is opened when the dryer is unloaded.

The five blade feed roller functions smoothly, even when the grain humidity is high,

and the feed rate stays uniform in terms of volume throughout the entire drying

process, regardless of the moisture content of grain. However, it is important to note

that the flow increases in terms of weight towards the end of the drying process as the

grain size is reduced.

The steep-angled feed troughs ensure even drying process and reliable circulation

under any circumstances. The structure of the feeding apparatus is very tight, allowing

to dry even small seeds (such as turnip rape).

The feeding apparatus features a bottom hatch shut-off mechanism to open and close

the bottom hatches. The opening mechanism is operated either with a cam.

9 D00125-2019_EN

The feeding apparatus with a cam operated bottom hatch opening mechanism features

a separate cam for opening and closing every bottom hatch. In such a feeding

apparatus the second and the fifth cam (see Figure) has an intermediate position, which

can be used to control the flow of grain into the bottom trough when the hatches are

opened with the cam.

CLOSED INTERMEDIATE POSITION OPEN

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