IOBP Training Manual - Vibrating Screen

PSSB - IOBP - Operation and Maintenance Manual REV. 0 MEI 2012

Beneficiation Plant

PSSB “Beneficiation Plant”

Vibrating Screen

Manual Instruction

TABLE OF CONTENTS 1. GENERAL 1

2. DESCRIPTION 3

3. HEALTH & SAFETY 10

4. FUNCTIONAL DESCRIPTION 14

5. CONTROL SYSTEM 24

6. INSTALLATION 25

7. COMMISSIONING 35

8. OPERATING INSTRUCTION 36

9. CARE & MAINTENANCE 42

10. SPARE PARTS 50

11. REFERENCES 53

12. APPENDICES 54

PSSB-IOBP OPERATION & MAINTENANCE MANUAL

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VIBRATING SCREEN Date 1-May-2012

1. GENERAL

1.1 About this manual

1.2 Brochures

1.3 Contract data

1.4 Service & repair information


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1. GENERAL

1.1 About this manual

Please read this introduction carefully before installation, using and

maintenance. This is the permanent technical documents of the screen, please keep it

well in case you use it at emergency.

For the purpose of mastering the use and maintenance, the manual provide

comprehensive and detailed information on the availability of such course. As we

seek continuous improvement of our Screen Machine, there may be a few

differences from the actual situation of machine, it is a normal phenomenon, sorry

for the inconvenience caused.

1.2 Brochures

1.3 Contract data

1.4 Service & repair information


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2 DESCRIPTION

2.1 Equipment specification

2.2 Product design

2.3 Intended use

2.4 Design

2.5 Material and maximum working pressure

2.6 Paint specification

2.7 Dimensions

2.8 Performance

2.9 Certificates and test results


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2. DESCRIPTION

The undersize screen refers to the screen with screen mesh less than 1 mm. in

the mineral and processing plant, it may be adopted as the equipment for such

operation as screening classification and dehydration. At the present, the undersize

screens utilized in the mineral processing plant are: fixed undersize screen, high

frequency vibration undersize screen, rectilinear vibration undersize screen, shaking

undersize screen, gyratory undersize screen and cyclone undersize screen. Therein

the high frequency undersize screen is applied the most extensively in the metallic

mineral processing plant and its vibrating modes are mainly divided into

electromagnetic vibration and shock excitation machine vibration. The screen

surfaces are mainly divided into metal woven meshes and nylon meshes. The

effective screening area of the metal woven mesh is large but it is easy to be worn

and its maintenance expense is large; the effective screening area of nylon mesh is

small but it is wear resistant and the maintenance expense is small. The shaking

undersize screen and gyratory undersize screen are mainly used for screening

classification of non-metal and coal.

There is a very large relation between the separation size and screen size selection so

that the suitability of the selected size will have a direct influence on the concentrate

grade and the productivity ratio. At the present, the relatively suitable example of its

application in domestic production is as follow:

Separation size/mm Screen size/mm

d1=0.044 s1=0.10

d2=0.063 s2=0.15

d3=0.074 s5=0.20

d4=0.10 s4=0.25

d5=0.15 s5=0.30


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2.1 Equipment specification

Table 2.1: Technical parameters of each stage of high frequency undersize screen

equipment:

Working

name

Model and

specification

Quantity

(set)

Screen

box layer

number

Screen

surface

area (m2)

Installation

inclination

angle (°)

Total

power

(KW)

One –stage D5F1014 2 5 1.4 x 5 17.5 6.8

Two-stage D5F1014 2 5 1.4 x 5 17.5 6-8

2.1.1 Parameters of Multi-Stack Composite Vibrating Screen（D5MVSk1014d）

11．1. Electromagnetic vibration frequency: 50HZ;

11．2. Electromagnetic vibration Amplitude: 1～1.5mm;

11．3. Electromagnetic vibrating Power (Apparent Power): P1=2.8kW;

11．4. Electromagnetic vibration active power: P1＇=0.52kW;

11．5. Screen Box linear vibrating frequency: 23HZ;

11．6. Screen Box linear vibrating amplitude: 1.5～2mm;

11．7. Vibrating Motor Power: P2=1.84×2=3.68kW;

11．8. Screen Box Inclination: 17.5°;

11．9. Feeding Particle size: ≤8mm;

11．10. Mineral Concentration Processing Capacity: 70～100t/h (Fine

Classification and dewatering)


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2.2 Product design

Composite Vibrating Screen is a new type of solid material screening

equipment developed by LANDSKY TECH TANGSHAN CO.,LTD, it is a

composite vibration consists of the electromagnetic vibration(impact the sieve) and

the linear vibration of screen box. The machine has a high screening effici ency,

simplicity of operation, a stable performance, small power consumption, a small

dynamic load and a self-cleaning function.

This Multi-Stack Composite Vibrating Screen is mainly applicable for Wet

screening process and Dry screening process of fine materials, classification,

dewatering, desliming and Isolation of crude in different industries. Multi-Stack

Composite Vibrating Screen is newly developed from the normal MVS Series

Single-stack and Multi-Stack. It adopt the structure of Multi-Stack Screen, these 5

Stacks combine together to an integral unit and equipped with Vibrating Motors

which provide the power of screen box linear vibration to accomplish Composite

Vibration.

The model Numbers of Multi-Stacks Composite Vibrating Screens are showed as

follows:

D 5 F MVSk 10 14 d

Exciter type

Effective Sieving Length (dm)

Effective Sieving Width (dm)

Electromagnetic High Frequency Vibrating

Screen (Mineral Concentration)

Composite Vibration

Multi-Stack, Stacks of Screen Box


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The appearance and installation size of all kinds of Multi-Stack Composite Vibrating

Screens, please find the weights in the General Assembly Drawing (Please find in

the Documents delivered with the machine)

2.3 Intended use

2.4 Design

Figure 1.1: Side View of Multi Stack Composite vibrating Screen D5FMVSk1014d


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Figure 1.2: Typical Five Deck Derrick Stack Sizer

2.5 Material and maximum working pressure

2.6 Paint specification

2.7 Dimensions

2.8 Performance

Table 2.2: Technology indexes of undersize screen:

Working name Feed

concentration

Undersize

concentration

Oversize

concentration

Undersize

fineness -200

meshes %

One-stage 50 35 60 85

Two-stage 40 36 66 85


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2.9 Certificates and test results


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3 HEALTH AND SAFETY

3.1 General

3.2 Warning & caution sign


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3. HEALTY AND SAFETY

3.1 General

3.2 Warning & caution sign

3.2.1 Personal Safety

Guards, covers and shields are installed around moving parts at the factory to

help protect from injury those working on or near the equipment. Do not modify or

eliminate safety devices installed at the factory. Make sure that everyone working on

or near the equipment is familiar with safety precautions. Owners and operators are

responsible for reading safety information and following safe practices. Think

safety! Act safely!

Wear a protective breathing mask whenever dust and fumes are

above acceptable limits.

Wear protective goggles or safety glasses with side shields to prevent

flying particles from entering eyes.

Hard hats can prevent injury and are required at most work sites. Be

sure to wear yours.

Do not remove any guards, covers or shields when equipment is running.

Replace any guards, covers or shields after adjustment or maintenance.

Never lubricate equipment when it is moving or running.

Report defective machinery and unsafe conditions to your supervisor.


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Always look around equipment before start up to make sure no one is making

adjustments, pulling maintenance or standing close to moving parts. Always

know where your co-workers are.

3.2.2 Work Area Safety

Make certain all electrical equipment is properly grounded. Wet spots

near electric current are especially dangerous. Use ground- fault

interruptible circuits wherever potential shock hazard exists.

Be alert around any pressurized system, be it hydraulic or air. High-

pressure gases and oils can be very dangerous. Know your equipment

and operate it properly.

Know where fire extinguishers and other fire suppression equipment is

located. Learn how to use it.

Grounding connection is a must for the equipment, the Grounding

resistance should be less than 4 Ω, please find below Grounding

Position Drawing for reference (The machine is properly labeled)

Keep equipment clean and free of dirt and grease so it can be checked

for loose, cracked or broken parts. Replace defective parts as soon as

they are discovered.

Frequently check whether the ladder and safety handrail are firm and

reliable; timely handle and report problem found.

During equipment adjustable and checking, the obstructions above the

head, under the foot and all around shall be noted in order to prevent

slipping.

Keep the tread clean; when stepping up and down the ladder, holds


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slipping.



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slipping.



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hands firmly and stand firmly. Starting electric switch with wet hand is

strictly forbidden to avoid electric shock.

It is strictly forbidden to start the equipment which is hung with

overhaul board.

Always use hoisting equipment for heavy loads. Regularly check

hooks, cables, shackles and chains for stretch and wear. Never

overload the lifting capacity of hoists, cranes and lifting devices.

Keep work area neat and as clean as practical.

Keep all warning and caution signs clear and up to date.


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4. FUNCTIONAL DESCRIPTION


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4. FUNCTIONAL DESCRIPTION

4.1 Operational Principle and Structure Characteristics

4.1.1 Operational Principle of Multi-Stack Composite Vibration Screen

The slurry consisting of water and process material is equally distributed to the

dedicated feeders that supply each screen frame. The vibratory action of the motors

provided the G-forces required facilitate the screening processes.

Water and undersize particles pass through each screen panel and flow into an

undersize collection pan. A duct at the lowest part of the pan empties into undersize

manifold that carries the material to the undersize discharge flange. The vibration

conveys larger particles along the top surfaces of the screen panels to the end where

they fall off into the oversize hopper. Oversize material is then discharge through the

flanged port on the undersize of the oversize hopper.

Re-pulp machines are a replaceable rubber-lined re-pulp tray and spray bar between

each screen section. The spray bars continually disperse water into the re-pulp trays

to add free water to the screening operation (Figure 3). This free water facilitates

separation of the undersize material, allowing it to pass through the screen surface

unhindered, thereby increasing the screening efficiency. By utilizing the transitional

area between the two screen panels for the re-pulp process, screening efficiency is

increase without increasing length of the deck.

Figure 4.1: Re-pulp tray operation


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As for MVS electromagnetic vibration HF vibrating screen, its parameter are

centralized and controlled by adopting the computer controlled cabinet and the

vibration frequency may be alternating. Under the program control, the control, the

vibration frequency may be automatically switched as 25HZ and 50Hz, and it may

also be fixed frequency as 25Hz and 50Hz. additionally, the vibration parameters of

the each vibration system may be prepared by software; the vibrating arm and

vibrating screen surface of each vibration system are driven separately and

respectively; the amplitude may be adjusted in segments at any time. Except for

vibration parameters of general operating conditions, the parameter of the

discontinuous instant strong vibration is also needed to clean the screen surface at

any time so as to keep the screen mesh unblocked and improve the working

efficiency.

It has the following characteristics over other undersize screens:

1. There is no rotary part and there is no need to apply lubricating oil.

2. Its structure is simple so that it is convenient for maintenance, its structural

durability is good and the failure rate is low.

3. The resonance principle is applied for the vibrator, it is worked in double

body critical resonance state and the required driving power is small, so there

is no large pickup current and the noise is low when it is started.

4. After starting the vibrator, the amplitude may reach the operation stable

value instantaneously. When it is shut down, its amplitude may disappear

instantaneously. It is allowed to be directly started or shut down under rate d

voltage, current and amplitude.

5. The shock excitation or amplitude of the screen frame is adjustable. The

particle size (namely,-200 mesh percentage content) of the undersize product

may be controlled by changing the exciting force of the screen frame

(adjusting the power supply of the shock excitation). It is very beneficial to

guarantee the concentrate grade of the ore in different crystal sizes.


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6. At the same time of screen frame vibration, the relative vibration also

generates between screen bars of the screen sheet and the screen sheet gap is

difficult to be blocked.

7. On the condition that only start the electromagnetic exciter(The exciter is

mounted inside the box of sideboard of screen box), Alternating current

magnetic force is conveyed to main vibrating screen, force transmission

bolts, vibrating rod and vibrating shaft as the power of make the vibrating

arm under the sieve do a reciprocating swing, the vibration brought by the

vibrating cap in the top of vibrating arm support and impact the sieve whil e

the screen box almost not move, the vibrating system is working under near

resonant condition, only a smaller power is needed for reaching the specified

operation parameter. The screen mesh is vibrated at a high vibrating strength,

and the vibration intensity is 8-10 times that of the acceleration gravity. 2-3

times that of the common vibrating screens. The screen has a high screening

efficiency and a high throughput capacity. Each electromagnetic exciter has

small power consumption; the active power is only 130W. So model of

screen is high performance energy saving product, each screen box has

several vibrating systems in the longitudinal direction(length direction),

which driven by the exciter to impact the Screen Mesh, the screen mesh is

vibrated at a high frequency of 50HZ,the vibrating parameters are regulated

by the control cabinet.

On the condition that only start the vibrating motor, 5 Stacks screen boxes is doing

an integral linear vibration to achieve composite vibration to the screen mesh.


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4.2 Overall Structure of Multi-Stack Composite Vibrating Screen (As shown in

Drawing)

1 Screen Box

1.1 Mesh

1.2 Hook Plate sealing type

3 Control Cabinet

4.3.4 Oversize Collection

4.3.5 Undersize Collection

5 Feeding Box

8 Frames

10 Slurry Distributors

Figure 4.2: Drawing of Multi Stack Composite Vibrating Screen


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Drawing)

1 Screen Box

1.1 Mesh


3 Control Cabinet



5 Feeding Box

8 Frames




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Drawing)

1 Screen Box

1.1 Mesh


3 Control Cabinet



5 Feeding Box

8 Frames




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Table 4.1

Figure 4.3: Major component of Derrick’s Stack Sizer


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Table 4.1



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Table 4.1



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4.3 Structure and Characteristic

Multi-Stack Composite Vibrating Screen shows the advantage in occupying smaller

areas and a high screening efficiency, each electromagnetic vibration of screen box

could be controlled respectively, Multi-Stack screen boxes is doing a integral linear

vibration, each screen box could be fed separately and evenly spread. Oversize and

Undersize materials are collected separately with no interference.

4.3.1 Screen Box

Screen Box consists of Frame, Mesh, Exciter, Transmission System, Hook Plate and

Vibrating Motor.

The model numbers of Multi-Stack Composite Vibrating Screen is reflected in the

numbers of Screen Box and Structure. The numbers of Screen Box decide the

numbers of Stack, each electromagnetic vibration of screen box could be controlled

respectively, each screen box has two exciters, two coils inside each exciter are

parallel connection which could be adjusted by a knob, Intermittent strong vibrating

is also set for screen mesh, cleaning the mesh at periodical time so as to keep the

screen mesh unclogged. The arc shape surface of mesh is helpful to uniform

distribution and increase of utilization ratio.

The function of vibration motor is to bring linear vibration of screen box ass embly,

increase screening efficiency and processing capacity.


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4.3.1.1Mesh

The mesh consists of three layers. The bottom layer is a supporting mesh which

contact the vibrating cap, normally adopt Steel Wire Core Polyurethane Mesh or

Large Aperture Steel Wire Mesh, it play a role of protect the Working Mesh. The

top layer contact the materials is Working Mesh which consist of two layers of mesh

vulcanized together by rubber with different aperture sizes, it has a lightweight and a

high opening rate.

Figure 4.4

Figure 4.5


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4.3.1.1Mesh






high opening rate.

Figure 4.4

Figure 4.5


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4.3.1.1Mesh






high opening rate.

Figure 4.4

Figure 4.5


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1 Shaped Bolt

2 Nut

3 Large Washer

4 Rubber Compression Spring

5 Cushion Block

6 Sideboard

7 Side Hook Plate

8 Working Mesh

9 Supporting Mesh

10 Retractor Plate

4.3.1.2 Hook Plate sealing type

The Working Mesh and Supporting Mesh of Multi-Stack Composite Vibrating

Screen are tightly stretched in transverse direction by hook plate; the meshes also

could be sealed while stretched. The structure as shown below:

Figure 7

4.3.2 Frame

The frame is frame structure overall welded with channel beam, it play a role of

support screen box assembly.

4.3.3 Feeding Box

Convey raw materials, provide a uniform distribution, and make the best of

screening.


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1 Shaped Bolt

2 Nut

3 Large Washer


5 Cushion Block

6 Sideboard

7 Side Hook Plate

8 Working Mesh

9 Supporting Mesh

10 Retractor Plate





Figure 7

4.3.2 Frame



4.3.3 Feeding Box


screening.


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1 Shaped Bolt

2 Nut

3 Large Washer


5 Cushion Block

6 Sideboard

7 Side Hook Plate

8 Working Mesh

9 Supporting Mesh

10 Retractor Plate





Figure 7

4.3.2 Frame



4.3.3 Feeding Box


screening.


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Trough is used to collect the oversized materials of each screen box.


Trough is used to collect the undersized materials of each screen box, it will be

bolted with the Oversize Collection Trough together as an integral unit.

4.3.6 Control Cabinet

The Multi-Stack Composite Vibrating Screen adopted Microcomputer Digital

Control System, it has Soft-Start type, a reliable performance, a simplicity operation

and easy maintenance. The vibrating parameters could be regulated by control

cabinet, please find the details in 《LK-MVS Digital Control Screening System

Cabinet Operation Manual》

4.3.7 Slurry Distributor

Slurry Distributor is used to supply materials to each feeding box of screen machine,

the Feeding Box and Slurry Distributor are connected by hose, make sure there is a

tilt angle with the hose, the position of Slurry Distributor Frame is determined

according to the site conditions.


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5. CONTROL SYSTEM


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6 INSTALLATION

6.1 Delivery, handling and storage

6.2 Foundation requirements

6.3 Installation tools and equipment

6.4 Installation procedure

6.5 Pipe connections and pump sump

6.6 Shaft gland

6.7 Motor and drive


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6. INSTALLATION

6.1 Delivery, handling and storage.

1. Basic principles of storage is to protect the paint layer, cladding material and

coating layer covered the surface of screen’s parts, prevent corrosion,

deformation and mechanical properties change of the parts, and keep the

effective continuity.

2. During the loading and unloading, the hanging should be accorded with hoisting

position indicated on wrap page. Fibre lifting belt should be used to prevent

damage to overcoat if paint surface or coating layer touched.

3. Storing and placing shall be complied with packaging requirements or refer to

relevant standards, wrapping object can only be touched each other to avoid

direct contact with the surface causing deformation or damage to component

part surface.

4. During storage, parts with rubber springs, should ensure that their state is not in

strained condition, to prevent early failure or performance changes of rubber

springs. And the rubber spring should avoid contacting with the materials with

erosion effect to rubber, such as oil and organic solvents.

5. The rubber spring of screen’s component parts should be sealed and dark

storage.

6. Storage location of component parts should avoid direct sunlight to prevent parts

aging or paint fading, able to effectively prevent invasion of rain, snow and

water, and maintain good ventilation. The location temperature is no less than

5℃, and the relative humidity is no more than 60%, otherwise, the vibrating

motor should be removed to keep in other place.

7. Storage conditions and maintenance of electrical control cabinet with special

packaging should be implemented in accordance with "electrical control cabinet

manual".

8. Spare parts kit and special tools’ box should be stored in ventilated, dry, and

shade place.


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9. Composite mesh and polyurethanes mesh (PU mesh) should be avoided mixes

puts with oil or organic solvent, and placed horizontally, packaging should be

able to effectively prevent the mesh deformation by weight pressure.

6.2 Foundation requirements

6.2.1 Preparation for Installation

Infrastructure must meet the requirements, able to withstand greater

than various load on the foundation of screen foot. Load on the foundation of screen

foot:

Feeding end:

Dynamic load of regular work:

Horizontal dynamic load (Lengthways) N,

Vertical dynamic load N;

Resonating dynamic load of screen’s start and stop:


Vertical dynamic load N.

Vertical static load: N.

Discharge end:

Dynamic load of regular work:


Vertical dynamic load N;

Resonating dynamic load of screen’s start and stop:


Vertical dynamic load N.

Vertical static load: N.


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6.2.2 Long term storage

If storage period of rubber spring is more than 6 months, before installation each

spring should be carefully examined, checking the hardness, elasticity, with or

without aging and so on, the one that performance indicators do not meet the

requirements must be replaced. Rubber spare parts in a sealed, dark storage after 24

months must be carried out a performance test before using, it cannot

be installed or used except the test result meet the requirements.

Table 6.1: Rubber spares must meet the following performance indicators:

Item Hardness Appearance Fix location

Main vibrating spring 42

No significant deformation

and damage

Hinge spring 83��

Transmission linkage

place

Hinge axis spring 62 Both ends of

vibrating bar

Shear rubber spring 45��

Damping rubber

block

55��


6.3.0 Installation of multi-stack composite vibrating screen

All the packaging and holder for transport protection should be removed

before screen installation.


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and damage



place


vibrating bar


Damping rubber

block

55��






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and damage



place


vibrating bar


Damping rubber

block

55��






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6.4.1 Installation of chute overs and unders

Chute of overs and unders are assembled at the factory as a whole, not required to

separate while installing, after bottom case installation completed, put the chute on

the square hole of install base (see Figure xx) , and then place “group of frame,

screen box and feed box” on the chute, last fasten the connector through the frame

and the chute. (See overall structure: Figure xx.)

6.4.2 Installation of screen frame, box group and feed box

Before install, remove stationary bush between frame group and screen

box group, gasket between connection beam and frame, and tighten the

connection bolts as well as the bolts combined the shear rubber spring

with frame and screen box. Then remove the secondary support pole.

The frame group and box group are assembled at the factory as a whole connected

by shear rubber spring, feed box is connected with side frame column, and position

of the feed box can be adjusted through change the height of support hole, and

feed box is joined with connection angle steel as one. (See Figure 4)


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Figure 6.1


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S/N SPECIFICATION NAME QUANTITY

1 D5F1014d10.01 Box group 1

2 D5F1014d10.04 Frame 1

3 D5F1014d10.05 Feed box 5

4 D5F1014d10-01

Angle steel for

connection

2

5 GB/T5871-2000 Bolt M16×45 30

6 GB/T41-2000 Nut M16 66

7 GB95-1985 Cushion 16 30

8 GB93-1987 Washer 16 66

9 GB/T93-1987 Washer 12 88

10 GB/T5873-2000 Bolt M12×30 88

11 D5F1014d10.08 Shear rubber spring

spares

22

6.4.3 Installation of mesh

The mesh is horizontally tensioned in screen box, there are two working

meshes and two support meshes on each screen box. First put hook of support mesh

parallel to the side plate, hook downward, the mesh is tiled on the vibrating cap, one

end of the hook is fixed on the angle steel of screen box, the other end with hooks is

buckled together with retractor plate, shaped bolts are passed through the position

block, and rubber spring, a large washer, nut, and o-rubber seal installed in turn,

equably tighten the nut on the retractor plate hooks, and tension the support mesh.

Second put hook of working mesh parallel to the side plate, hook upward, tiled on

the support mesh, note that working mesh should be put in p roper direction, the

mesh strengthening part with vulcanized rubber must correspond to polyurethane

vibrating cap below the support mesh. After mesh positioning, buckle the

hooks together with retractor plate on the sides of screen box, shaped bolts are

passed through the position block, and rubber spring, a large washer, nut, and o-


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rubber seal installed in turn, equably tighten the nut on the retractor plate hooks, and

tension the working mesh. (See figure 3)

Note: the mesh must be paved and proper tension while installed, distorted folds and

other surface irregular must be avoided, so as not to affect the mesh life

or screening effect. While tightening shaped bolts, screwed degree of both sides

should be consistent with the symmetry to prevent deflection of the mesh installation

location. Compression amount of the rubber spring is 1～2mm,

excessive compression will damage normal function of the rubber spring.

When replacing the mesh, shaped bolt shall not be pulled out, just rotated direction

to ensure retractor plate can be taken out.

6.4.4 Access of electric control cabinet

Cable air plugs are inserted into plug seat inside the cabinet, ensuring good

contact and tightening the clips. The power wires are soldered to terminals in.

More use and maintenance information, see "The manual of electric control cabinet

mate with LK-MVS digital control screening system ".

Note: pay attention to the following terms while installation

1. This device must be connected to protective earth, grounding resistance is

less than 4ohms. The screen should be installed ground wire in accordance

with the ground sign location.

2. The control cabinet should be placed in dry and dust-free place, and

be protective, to avoid the vibration and shock. Placed in the open

place, water washout, dust and other harsh conditions are prohibited.

3. A cable from two parallel coils from one exciter on the side of screen is

called one route, some routes are converge in junction box. Usually the


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length of the cable from junction box to the control cab inet is10 meters while

leaving factory (according to the customers’ needs, the length can be

changed before leaving factory), and the cable should be placed on cable

racks to be protected from damage.

Warning! Incorrect tightening will cause improper screen panel

tensioning, resulting in premature wear. Be sure that correct tightening

sequence is followed.

Figure: Check panel tension by lifting the edge

Figure: Check for straight alignment of panel ribs with stringer protectors.


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Figure: Check for consistent number of exposed treads on all draws bolts.

6.5 Pipe connections and pump sump

6.6 Shaft gland

6.7 Motor and drive


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7. COMMISSIONING


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8 OPERATING INSTRUCTION

8.1 Start -up

8.2 Shutdown


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8. OPERATING INSTRUCTION

Once installed, screw tightness and block should be checked, make sure there is no

obstacle to the movements of Multi-Stack Composite Vibrating Screen. Turn on the

current to achieve the start condition. Please find the Electrical Operation at 《LK-

MVS Digital Control Screening System Cabinet Operation Manual》

8.1 Start –up

Re-lubrication should be done if there are more than 24 months since the date of

manufacturer of Vibrating Motor. The operation should be in compliance with

‘Vibrating Screen Operation Manual’.

Hours Empty Running should be done to observe the operation status before

production run. Smooth running or not, is there a strong vibration.

The displayed data are same as the sequence of exciters respectively, and

accomplished independent control. Adjust the amplitude gradually and check

whether the changes of increase and reduce are in compliance with the operations.

Are there any abnormal noises, especially is there any metal impact sound between

Magnetic Plug and Armature inside the box of exciters. If so, please adjust it.

The adjustment of Electromagnetic Exciters: The space between Magnetic Plug and

Armature named Air Gap δ, δ play an important role in the running of Screen

Machine. Normally, δ should be confined between 2.0 – 2.5mm, the vibration force

will be difficult to meet the operating requirements if the δ is too big; It will incur

metal impact sound between Magnetic Plug and Armature if the δ is too small. All

the exciters had been adjusted to its optimum condition before delivery. Amplitude

is set at 70% - 80%, and the amplitude of sieve is set at 1.5 – 2.0mm, the period of


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Transient Vibration is 3 second. The interval of Transient Vibration could be regulated

from 12 seconds to 6 minutes.

Prolong the life of vibrating parts and sieves by making the most of small

amplitude in normal operation.

Variation of δ incurred by vibration or other reason. Check whether the Compression of

Main Vibrating Spring is in the range of 2.0 – 2.5mm when there is δ variation, change

the δ by adjusting Compression of Main Vibrating Spring, and regulate the Air Gap

between clamp and exciter to change the δ if it is still not in the range of 2.0 – 2.5mm

after above procedure. The specific method is to lose the bolt of c lamp in order that

make more space between clamp and the box of exciter, and insert the washers inside

the gap.(The thickness of washer is 0.3mm, please find Drawing -5 for your reference).

Figure 8.1

Warning: Shutdown the machine before adjusts δ, unplug the power. Power

operation is prohibited during adjustment.

After a while of operation, the surface temperature of coil increase to

maximum 50℃, and the temperature of screen box is also high, please do not

touch it to prevent from burned.


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Figure 8.1







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Figure 8.1







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Figure 8.2

The force transmission bolt assembly of Armature consists of two positioning

blocks in the upper and bottom positions respectively, the upper side of the

positioning block is steel plate, and the bottom side is rubber. The rubber side leans

against the Silicon Steel Sheet of force transmission bolt assembly, another side is

screwed to the screen box. Loose the bolt of positioning block before adjust the Air

Gap, fasten the bolt of positioning block after adjustment and tight the nut. The

compression of positioning block should be confined in the range of 1 – 2mm, the

service life will be reduced if it is compressed too tight.

The General Principle is: The Air Gap should be as small as possible on the promise

of required amplitude and no impact between Magnetic Plug and Armature. On the

promise of normal operation, use low current and small amplitude as far as possible,

long interval of Transient Vibration to prevent the sieve and vibrating parts f rom

damage caused by vibration.

Make sure there is no difference with vibrations of different vibrating caps. Check

whether the vibrating cap is closely tied up the sieve, loose the fixing bolt on the

vibrating arm if there is some space between the vibrating cap and the sieve, turn the

vibrating shaft to adjust the position of vibrating cap to tie up the sieve, then tighten

the screw. (As shown in drawing below).


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Figure 8.2




















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Figure 8.2




















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Figure 8.3

8.2 Shutdown

Shutdown the machine after 4 hours running, check the temperature rise of Magnetic

Plug coil, it should not exceed 50℃. Make sure the entire bolt are tightened,

especially the connecting bolts between the vibrating arm and vibrating shaft, it will

influence the vibrating effect if not tight.

Stop feeding before shutting down, stop the machine after all oversized materials

had been cleaned up. The sieve should be protected properly, no tread and strike on

the surface of sieve by iron and other hard objects. Flush by clean water and wash by

nylon brush when clogging.

Regulate the surface amplitudes of each sieve by adjusting the amplitude of exciter

respectively as feeding required.


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Figure 8.3

8.2 Shutdown












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Figure 8.3

8.2 Shutdown












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Table 8.1 shown normal shut down procedure shall be followed each time the

equipment is shut down for maintenance and/or changing of screen panels:


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9 CARE AND MAINTENANCE

9.1 Running checks

9.2 Preventive maintenance & service schedule

9.3 Fault finding

9.4 Lubrication

9.5 Dismantling and assembly


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9. CARE AND MAINTENANCE

9.1 Running checks

Routine maintenance will ensure maximum life and trouble-free operation.

While the maintenance schedule presented in this section is flexible, modifications

should be based on experience with operating the equipment at your facilities. A

maintenance log should be kept to help establish a routine maintenance schedule, as

well as to monitor and adjust the schedule as necessary throughout the equipm ent’s

life.

Consider the following factors when establishing a maintenance schedule:

Duty cycle

Ambient temperature

Operating environment

9.1.1 Routine maintenance

Routine maintenance consists of overall inspection and cleaning.

Table 9.1: The following table lists the recommended routine maintenance

procedures


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9.1.2 Screen Frames

All screen frames include screen tensioning components and the mounting surface for

the screen panels. The upper screen frame (Figure _) also includes mounting provisions for

the vibrator motors. The screen frames are suspended between the side support channels.

During normal operation, the screen frames and tensioning components accumulate residual

mud that should be removed periodically. When replacing stringer protectors a snug fit

against the cross supports but without causing any buckling. After instal lation confirm that

protectors lie flat and no gaps are present between ends of protectors and cross supports.

In addition, the float mounts should be inspected and replaced when damage is evident. Since

these components isolate the vibratory motion of the screen frames from stationary parts of

the machine, deterioration may occur over time.

Figure 9.1: Screen frames and associate components


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Table 9.2

9.2 Preventive maintenance & service schedule

9.2.1 Exciter In operation a）Check the power supply, fuse and coil

b）Check the condition of circuit board is there any loosing or damage.

c）Check the arraying cables contacted properly or not.

d）Make sure the setting of Control Cabinet is correct.


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9.2.2 Displayed amplitude is big while real amplitude is small.

a）Air Gap is too big

b) The type of vibration setting is correct or not

c）Is there any block with the parts of machine.

9.2.3 Small amplitude

Increase the amplitude by adjusting the control cabinet, reduce the δ

9.2.4 Abnormal Metal Clashing a）Adjust the amplitude if it is too big

b）Uneven Air Gap or too small

c）Loosing inside the exciter by offset

9.3 Fault finding

Rapid change draw bolt assembly components (Figure below) should be

replaced if inspection reveals distortion, damaged threads, severe corrosion, or

galling. Thoroughly clean draw bars, removing any built-up material on the edge

that engages the hook strip on the screen panel. Replace any draw bar that ca nnot be

restored to fully serviceable condition.


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Figure 9.2: Rapid change draw bolt assembly components.


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*Torque will vary depending on condition of channel protectors and cross and

side products.

Figure 9.3: Rapid change draw bolt assembly installation


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9.3.1 Ordinary faults and handling methods of high frequency vibration undersize screen

Table 9.3: The ordinary faults and handling methods of high frequency undersize screen

FAULT FAULT CAUSE HANDLING METHOD

The machine does not vibrate after it is

powered on

The fuse is broken The fuse shall be changed The conducting wire of the coil is short-circuited or the joint of the outgoing line is

broken

The short circuit shall be handle or the outgoing line

shall be connected-well

The vibration is weak, the amplitude is small

after adjusting the potentiometer; it is out

of function or the current is higher

The silicon controlled suffers a breakdown

The silicon controlled shall be changed

The air gap is blocked and the plate spring is blocked

The blocking stuff shall be changed

The machine noise is large, the amplitude is

irregular after adjusting the potentiometer and

there is a violent impact sound.

The plate spring is broken The new plate spring shall be changed

The welding at the joints of the vibrator and the screen is broken or the bolt is broken

and loosed

The welding shall be done and the bolt shall be

changed

The screen frame contacts the slot body

The screen frame shall be suspended in place

The iron core impacts with armature iron

The air gap shall be adjusted to the standard

value of 2mm

9.4 Lubrication

9.5 Dismantling and assembly


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10 SPARE PARTS

10.1 Recommended stock of spares

10.2 Storage of spares

10.3 Spares ordering procedure

10.4 Spare parts drawings

10.5 Parts list


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10. SPARE PARTS

10.1 Recommended stock of spares

10.1.1 Wearing Part List

Number Name Model Number 1 Vibrating Cap (Quick

Installation) L=60mm

2 Working Mesh Comment: Working Mesh is consumable

The No 1 of Wearing Part - Vibrating Cap including: The method of replacement:

Take out the damaged cap after remove the bolts if the vibrating caps are worn out,

align the cap with the vibrating arm as the drawing, knock by wooden mallet lightly

till in place.

Figure 9.4


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10.2 Storage of spares

10.3 Spares ordering procedure

10.4 Spare parts drawings

10.5 Parts list

10.5.1 General spare parts

Table 10.1: The general spare parts of MVS Multi Stack Composite Vibrating Screen are as

follows:


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11. REFERENCES

1. Multi-Stack Composite-vibrating Screen D5FMVsk1014d (pdf).

2. Beijing Tieforce Engineering Co., Ltd’s Technical Description of

Beneficiation Process

3. Derrick Stack Sizer SG Motor Maintenance and Operation Manual, Rev 15

Jan 12 (pdf).

4. Cedarapids Operation and Maintenance Manual Flat Screen (pdf).

5. Safety Instruction for Major Equipment Operating (pdf).


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12. APPENDICES


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IOBP Training Manual - Vibrating Screen

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