Buhler DFTA 12 Operating Instructions Manual

Bühler AG

CH-9240 Uzwil, Switzerland

Phone +41 71 955 11 11

Fax +41 71 955 33 79

www.buhlergroup.com

Operating instructions

DFTA-66620-2-en-1803

Throw sifter

DFTA 12, DFTA 13, DFTA 23

2 Throw sifter

Preface

The operating instructions have to be handed over to those persons who are

responsible for the operation and the supervision of the machine.

This operating manual includes the information necessary for the operator for instal-

lation, operation and maintenance.

We have refrained from describing tasks requiring no special knowledge.

Instructions for repairs exceeding the normal maintenance tasks are not provided.

Important information

• Procedures upon receipt

Inspect the equipment visually in accordance with the delivery contract as soon

as it has been received.

•Storage

Equipment that is not installed immediately must be stored protected from

weather and other influences.

• Installation

The assembly and installation of the machine and machine equipment must

only be carried out by observing all installation instructions provided.

• Design variants

If different designs are described in the documentation provided, only the infor-

mation concerning the version supplied will apply. We reserve the right to make

modifications due to technical progress up to the time of delivery.

• Duty of instruction

Only trained specialists are permitted to commission the system or carry out

maintenance work on it. Prior to initial start-up, the operating personnel are

required to become familiar with the documentation provided.

Additional documents

Designation Identification number

Spare parts catalog DFTA-8011-1

Throw sifter Table of contents 3

Table of contents

1 Safety ........................................................................................................................ 5

1.1 Explanation of safety instructions ................................................................................................. 5

1.2 Safety of personnel....................................................................................................................... 5

1.3 Designated use............................................................................................................................. 6

1.3.1 ATEX authorisation........................................................................................................... 6

1.4 Connecting to the electrical mains................................................................................................ 7

1.5 Safety concept.............................................................................................................................. 7

1.6 Spare and wear parts ................................................................................................................... 7

2 Description ............................................................................................................... 9

2.1 Identification ................................................................................................................................. 9

2.1.1 Identification plate ............................................................................................................ 9

2.1.2 Specification key............................................................................................................... 9

2.1.3 Design variants................................................................................................................. 9

2.2 Design ........................................................................................................................................ 10

2.2.1 DFTA 12 model............................................................................................................... 10

2.2.2 DFTA 13, DFTA 23 models. ........................................................................................... 11

2.3 Function...................................................................................................................................... 12

2.4 Technical data............................................................................................................................. 13

2.4.1 Ambient conditions .........................................................................................................13

2.4.2 Connected load .............................................................................................................. 13

2.4.3 Aspiration ....................................................................................................................... 13

2.4.4 Weights .......................................................................................................................... 13

2.4.5 Determining the mesh widths......................................................................................... 13

2.4.6 Standard mesh widths.................................................................................................... 13

2.4.7 Noise data ...................................................................................................................... 13

2.5 Dimensioned drawings ............................................................................................................... 14

2.5.1 DFTA 12 ......................................................................................................................... 14

2.5.2 DFTA 13 ......................................................................................................................... 15

2.5.3 DFTA 23 ......................................................................................................................... 16

3 Transport ................................................................................................................ 17

3.1 Crane suspension....................................................................................................................... 17

3.1.1 DFTA 12 ......................................................................................................................... 18

3.1.2 DFTA 13, DFTA 23 ......................................................................................................... 18

3.2 Transport weights and volumes .................................................................................................. 18

4 Installation .............................................................................................................. 19

4.1 Site requirements ....................................................................................................................... 19

4.2 Installation .................................................................................................................................. 19

4.3 Product inlet................................................................................................................................ 19

4.4 Product outlet ............................................................................................................................. 20

4.5 Energy connections .................................................................................................................... 20

4.5.1 Vibrator motors............................................................................................................... 20

4 Table of contents Throw sifter

4.5.2 Electrical diagram ........................................................................................................... 21

4.6 Earthing ...................................................................................................................................... 22

5 Commissioning.......................................................................................................23

5.1 Checks before start-up ............................................................................................................... 23

5.2 Verifying EC conformity .............................................................................................................. 23

5.3 Vibrator motors ........................................................................................................................... 24

5.3.1 Direction of rotation ........................................................................................................ 24

5.3.2 Adjusting the stroke for DFTA 12 / 13 / 23 ...................................................................... 25

6 Operation.................................................................................................................27

6.1 Product inlet................................................................................................................................ 28

6.1.1 Product distribution over entire width.............................................................................. 28

6.1.2 Adjusting the gates ......................................................................................................... 28

6.1.3 Distribution over one and two sieve decks for DFTA 13 and DFTA 23............................ 28

6.2 Throw sifters ............................................................................................................................... 29

6.2.1 Changing sieves for DFTA 12 and DFTA 13 ................................................................... 29

6.2.2 Changing sieves for DFTA 23 ......................................................................................... 30

6.3 Faults and troubleshooting.......................................................................................................... 31

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

7.1 Maintenance plan ....................................................................................................................... 33

7.2 Cleaning...................................................................................................................................... 33

7.3 Changing the sieve clothing........................................................................................................ 34

7.4 Sieve clamping............................................................................................................................ 36

8 Decommissioning...................................................................................................39

8.1 Disassembly ............................................................................................................................... 39

8.2 Disposal ...................................................................................................................................... 39

9 After-sales service..................................................................................................41

9.1 Spare parts ................................................................................................................................. 41

9.2 Contact ....................................................................................................................................... 41

Throw sifter Safety 5

1 Safety

The machine was designed and manufactured in compliance with recognised safety

regulations. In spite of this, inappropriate use can put the user at risk of injury. For

this reason, safety has been given the highest priority.

1.1 Explanation of safety instructions

The corresponding safety instructions are indicated as follows:

1.2 Safety of personnel

• Protective covers, hoods and gates must be installed and closed at all times.

Open or missing safety covers are danger spots for crush and cut injuries.

• Always keep safety devices in good working condition. Never bypass or disable

any safety devices.

• The system must be brought to a standstill before any maintenance work may

be carried out on the machine!

Make sure that all energy sources such as:

–Electricity

–Air

are switched off and disconnected. The lockable safety switch, which interrupts

the power at all poles, must be set to “0” and locked.

Danger!

Indicates an imminently hazardous situation which, if not avoided, can result

in death or grave injury.

Caution!

Indicates a potentially dangerous situation which, if not avoided, can result in prop-

erty damage and production failures.

Explosion hazard!

Indicates a potentially explosive situation which, if not avoided, can result in seri-

ous or fatal injuries and extensive property damage.

Note:

Indicates important information or instructions which, if not observed, can impair

the correct function of the machine and make it impossible to attain performance

parameters.

6 Safety Throw sifter

1.3 Designated use

The machine is designed solely for sieving animal feed and milling industry prod-

ucts. Any other use shall be considered noncompliant use.

1.3.1 ATEX authorisation

In areas where there is a risk of explosion, only machines and devices that are

approved for this purpose may be used (see identification plate).

If this symbol appears on the identification plate, the machine may be used in an Ex

zone.

This symbol is followed by the ATEX ID, which indicates the Ex zone in which the

machine may be used and the internal zone to which it may be connected.

Before machines with internal Ex zone can be connected to an installation, it must

be ensured on the installation side that no effective sources of ignition, metal parts

or stones can enter the machine from the installation.

Example:

2/3D means that the machine may be connected on the process side to an

Ex zone 21 and installed (used) in an Ex zone 22.

II 3/3D EEx c T=135°C x (Example)

Identifier for operating instructions

Maximum surface temperature to be expected in

normal operation at full load

Ignition protection class (if standard is applied)

D for dust / G for gas

External category

Internal category

Device group

Ex symbol

External category:

- = May not be installed in an Ex zone

* = Does not contain its own external source of ignition

1 = Conforms to ATEX category 1, connection to zone 20 or 0 is permitted

2 = Conforms to ATEX category 2, connection to zone 21 or 1 is permitted

3 = Conforms to ATEX category 3, connection to zone 22 or 2 is permitted

Internal category:

- = May not be connected to an Ex zone

* = Does not contain its own internal source of ignition

(A2) = (Assembly) with ignition protected devices conforming to ATEX category 2

1 = Conforms to ATEX category 1, connection in zone 20 or 0 is permitted

2 = Conforms to ATEX category 2, connection in zone 21 or 1 is permitted

3 = Conforms to ATEX category 3, connection in zone 22 or 2 is permitted

Throw sifter Safety 7

1.4 Connecting to the electrical mains

• Observe the regulations of the local safety authorities.

• The power supply must be fuse-protected in accordance with locally applicable

codes and regulations.

• Check that the operating voltage and frequency correspond to the specifications

provided on the identification plate and in the control cabinet.

• The electrical wiring to the control system must be connected according to the

wiring diagram to ensure that the phase conductors are really switched in the

case of single-phase power supplies.

1.5 Safety concept

The machine is normally part of an installation, and therefore has to be integrated

into the safety concept of the installation.

1.6 Spare and wear parts

Only original spare and wear parts may be used.

If this is not complied with, safe operation is no longer guaranteed, particularly if the

machine is used in an Ex zone.

8 Safety Throw sifter

Throw sifter Description 9

2 Description

2.1 Identification

2.1.1 Identification plate

The data indicated by “” have been imprinted on the identification plate according

to the specific machine.

2.1.2 Specification key

2.1.3 Design variants

Note:

Do not remove or cover up the identification plate.

Fig. 2.1

II */** EEx * T=*°C *

2

3

4

1

(1) Place of manufacture

(2) Type

(3) Machine No.

(4) Definition of ATEX ID

DFTA – 12

DFTA – 12 - Ex

Machine approved for use in potentially explosive

zone

Sieve area per sieve bottom = 1.2 m

2

Code

Machine type

Sieve area per sieve bottom

[m

2

]

12 1.2

13 1.3

23 2.3

10 Description Throw sifter

2.2 Design

2.2.1 DFTA 12 model

The machine consists of the dust-tight sieve housing which is supported on a frame

by hollow rubber springs. The machine is equipped with two sieve decks. The

clamping levers immediately release the slide-in sieve frames when unclamped,

which allows quick sieve changes. The sieve frame is supported on four hollow rub-

ber springs. This prevents vibrations from being transmitted to the housing.

Fig. 2.2

5

4

3

2

1

6

7

8

9

3

(1) Aspiration hood

(2) Sleeve

(3) Clamping levers for clamping the sieve

(4) Sieve deck (sieve with sieve frame)

(5) Door

(6) Frame

(7) Hollow rubber spring

(8) Vibrator motor

(9) Tension lock

Throw sifter Description 11

2.2.2 DFTA 13, DFTA 23 models

The machine consists of the dust-tight sieve housing which is supported on a frame

by hollow rubber springs. The machine is equipped with three sieve decks or option-

ally two sieve decks with a blind bottom between them (double flow system). The

clamping levers immediately release the slide-in sieve frames when unclamped,

which allows quick sieve changes. The sieve frame is supported on four hollow rub-

ber springs (7). This prevents vibrations from being transmitted to the housing.

Fig. 2.3

3

919

4

58

3672

3

(1) Aspiration hood

(2) Sleeve

(3) Clamping levers for clamping the sieve

(4) Sieve deck (sieve with sieve frame)

(5) Door

(6) Frame

(7) Hollow rubber spring

(8) Vibrator motor

(9) Transition piece

12 Description Throw sifter

2.3 Function

Product must be fed into the machine in metered quantities. In the inlet, the product

is evenly spread out over the entire sieve width of the machine. Oscillation of the

entire sieve box is achieved by means of vibrator motors. The sieve vibrations move

the product over the sieves and keep the sieves clean. This operating principle

allows high throughput rates and guarantees good sifting quality.

Fig. 2.4 DFTA 12

Fig. 2.5 DFTA 13 / DFTA 23

3 fractions

Aspiration

Aspiration Aspiration

4 fractions

2 fractions double flow system

(with blind bottom)

Throw sifter Description 13

2.4 Technical data

2.4.1 Ambient conditions

Temperature range: +5 to +50 °C.

2.4.2 Connected load

The connected load is specified according to customer and country.

2.4.3 Aspiration

To achieve good performance when operating the machine, connect the machine to

an aspiration system.

Required air volume:

•10 m3/min (DFTA 12)

•12 m3/min (DFTA 13)

•15 m3/min (DFTA 23)

2.4.4 Weights

2.4.5 Determining the mesh widths

Choosing the correct sieve mesh width is critical for performance and sifting quality.

Choose the mesh widths for the sieve deck according to the following formula:

MW = desired grain size of throughs / 0.8

Select the closest standard mesh width.

Application limit: 2 mm (smallest possible mesh width).

2.4.6 Standard mesh widths

2.4.7 Noise data

Machine type DFTA 12 DFTA 13 DFTA 23

Weights [kg] 330 670 880

Standard mesh widths in [mm]

2.0 2.5 3.15 3.55 4.0 5.0 7.1 9.0 11.0 25.0

Measured data

Equivalent sound pressure level in the machine area L

eq

=77dB (A)

14 Description Throw sifter

2.5 Dimensioned drawings

2.5.1 DFTA 12

Fig. 2.6

Throw sifter Description 15

2.5.2 DFTA 13

Fig. 2.7

16 Description Throw sifter

2.5.3 DFTA 23

Fig. 2.8

Throw sifter Transport 17

3 Transport

Allow personnel to transport the system only if they are familiar with the task and

have received proper training.

3.1 Crane suspension

The machine is shipped completely assembled and ready for connection. For trans-

port, the sieve box is fastened in place by four transport stabilisation devices (1) and

(2) that are attached to the sides. These devices are marked with yellow paint and

must be removed before commissioning the machine.

Danger!

Never walk beneath suspended loads.

Caution!

Check to ensure that the crane and lifting gear are designed such that they can

bear the load, and verify their maximum permitted load.

Hoist the machine at the specified suspension points only.

(Refer to Fig. 3.3,



18)

Fig. 3.1

1

2

(1) Upper transport stabilisation device (2) Lower transport stabilisation device

18 Transport Throw sifter

3.1.1 DFTA 12

Fasten the ropes to the frame; two ropes on the inlet side and one rope on the outlet

side.

3.1.2 DFTA 13, DFTA 23

Lift at the specified suspension points only.

3.2 Transport weights and volumes

Buhler DFTA 12 Operating Instructions Manual

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