Gyratory Screen

■ Description

►Customer reference list

CUSTOMER REFERENCE LIST (YEAR 2012-2014)
NO.	EQUIPMENT	VENDOR'S SCOPE OF SUPPLY	QUANTITY	TIME
		PROJECT LOCATION
13	Gyratory Screen	Srilanka	1 Set	20121024
25	Gyratory Screen	Australia	1 Set	20130800
33	Gyratory Screen	Iran	1 Sets	20140129
40	Gyratory Screen	Guyana	6 Sets	20140500
43	Gyratory Screen	Srilanka	1 Set	20140700

►IntroductionGyratory Screen is a new developed equipment particularly for urea .The main function is to provide accurate separation of materials without product deterioration, thereby resulting greater product yields at higher production rates. This machine consists of top cover, top screen fame, spacer, bottom screen fame, the base space and the screen box. The unique gyratory motion of the near horizontal screen surface and the available screen mesh cleaning system secure the gyratory vibrating screen quality as a high capacity product that efficiently developed for materials screening purposes.

► Application

As one of new type and high standard screening equipment, gyratory screen can be used to screen of raw materials and bean curd in large scale grease factory, and screen or classify large granular urea, powder materials or granulated feed in feed mill. Also, it can be used for preliminary cleaning of raw material in feed mill as well as classifying intermediate products after regrinding in middle-sized feed mill. What's more, gyratory screen can be widely used to screen and classify materials or finished products for grain, sodium bicarbonate, large granular urea, urea granules, ceramsite, zirconia, reduced iron powder, barite, spice, plastic, mining industry, rubber, wood industry, plywood, medicine, sugar, mining, papermaking, chemical, refractory materials, building materials, activated carbon, food, PVC powder and other fine materials etc..With the development of market circulation economy, it is increasing to be used in waste plastic industry to classify, and also can do size grading for materials with broken.

► Working principle
Gyratory screen adopts to Rotex technology,we also call it Rotex screen. which obviously improves the distribution of the material, thus it will enhance the screening efficiency and the effective utilization of the screen surface, also reduce the powder content of the final material .This design is totally enclosed without dust pollution,it not only improve the operation environment but also reduce the dynamic ratio and foundation load effectively.

Gyratory Reciprocating Motion The Gyratory Reciprocating Motion gradually diminishes along the length of the machine to an elliptical path and finally to a nearly straight line motion at the discharge end. 1. Circular motion at feed end  Spreads the material across the full width of the screen surface Stratifies the material Aggressively conveys material forward 2. Changing to elliptical motion at centre  Long stroke elliptical action Enhances product stratification Conveys material at high capacity 3. Straight-line motion at discharge end Removes near-size particles Improves screening efficiency No vertical component ensures material is in constant contact with the screen surface

►Features

1.Reasonable design,simple structure,stable operation

2.Fully enclosed and energy-saving design

3.Self-cleaning device (bouncing balls) of each layer,anti blockage

4.No vertical movement,screen cloth with long service life

5.Fully enclosed structure, no dust pollution

►Advantages

1.All components are easily accessible and removable for ease of disassembly and cleaning.

2.No vertical vibration, longer life span of mesh (6 – 12 months).

3.Every layer is installed an anti-blocking and cleaning facility and able to clean mesh while sieving. 

4.Exterior is designed for easy cleaning. Exterior permanent joints are either welded continuously, or strip welded and filled with epoxy.

5.Lower headroom permits operation in confined areas, reducing cost of building and maintenance.

6.Less conveying equipment is required for elevating material to the feed point.

7.Greater product yields at higher production rates.

8.Low energy consumption.

9.High screening efficiency.

10.Create low noise pollution.

►Selection condition

1.Material to be processed.

2.Granule size of the materials(Mesh size).

3.Moisture content ,density.

4.Granule size proportion if possible to get,the number of lays.

5.Capacity (tons or kg per hour ).

6.Local power supply(voltage and frequency).

The Advantage of using Wooden Screen Frame for Vibrating Screen

Vibrating screen wooden screen frame and plate have the advantages of sufficient strength, high opening hole rate and less blockage etc. When vibrating screen vibrates, the different shapes and sizes materials will pass through the screening plate under the action of vibration, material separation in order to achieve classification purpose.
Vibrating screen wooden screen frame and plate is commonly used for linear vibrating screen, it is convenient to replace screen mesh, you can also add bouncing balls which will increase the rate of passing through the screen mesh to prevent the blockage effectively, it is suitable for powder material screening. Wooden screen frame includes cypress screen frame, white pine screen frame and the Korean pine screen frame. The first one is an economic, the cost of the last two is 3 times higher than first one.

Wooden screen frame is an important working parts to complete the screening process, and it should be selected reasonably as per the requirement of screening equipment and working environment in order to achieve the best effect.

Cement bucket elevator

 Description

►Customer reference list

CUSTOMER REFERENCE LIST (YEAR 2012-2014)
NO.	EQUIPMENT	VENDOR'S SCOPE OF SUPPLY
		PROJECT LOCATION	QUANTITY	TIME
15	Bucket Elevator	Russia	1 Set	20121119
22	Bucket Elevator	Russia	4 Set	20130516
31	Bucket Elevator	Yemen	1 Set	20131200
35	Bucket Elevator	Philippines	2 Sets	20140304
39	Bucket Elevator	Mauritius	1 Set	20140500
44	Bucket Elevator	Thailand	1 Set	20140723
53	Bucket Elevator	Australia	3 Sets	20140220

►Brief Introduction
NE type bucket elevator’s traction configuration is plate chain , which is used for vertically transporting powder , granular and block material , and also high grinding material , such as coal powder , slag , limestone , cement raw material , cement clinker , cement , coal , dry clay etc , material temperature is less than 250℃. Max. Lifting height can be 40m .It is special for cement,so we also call it cement bucket elevator.

►Working Principle
    Hopper scoops up materials from the stone bucket below, then is lifted to the top with the conveyor belt or chain, and next it is downward rolled over bypass the wheel on the top and the materials are dumped into the accept slot now by bucket chain or hoist conveyor, and the whole process is over. The driving band of bucket elevator with driver is commonly made of rubber, and it is installed below or above the drive roller and the divert roller. The chain-drive bucket elevator is generally equipped with two parallel transmission chain, on which above or below is a drive sprocket and a divert sprocket. Continuous Chain or Belt Bucket Elevator for Cement are generally equipped with chassis to prevent the dust flying into the bucket elevator.

►Features
    1. Cement bucket elevator machine adopt plate chain, gravity discharge material;
    2. Chain is the superior alloy steel high strength plate chain, wear-resisting and steady.
    3. Adopt several kinds driving group to drive, there are maintains frame and guardrail on driven platform;
    4. There are rail and backstop, to prevent chain swing while running;
    5. There install the anti-return rubber plate at the discharge outlet;
    6. Bottom part has the self-tension device.

►Advantage 

    1.Low driving power, inflow feeding, induction unloading, high-volume hopper intensive arrangement. There is almost no feed back and excavating circumstance when materials are lifted, so invalid power is little.

    2.Wide lifting range, little materials type and property requirement can not only lift general powder and granule materials, but also lift high polishing materials. Sound seal and little circumstance pollution.

    3.Good running reliability, the advanced design principle and handling method assure reliability of whole machine running, the non-fault time exceed 20 thousand hours. Stable running make it reach higher lifting height.

    4.The life is long, inflow feeding, non excavating with hopper and there is few extrusion and collision circumstance between materials. There is little materials sprinking during feeding and discharging to reduce machinery abrasion.

    5.wide application bucket elevator as one of material handling equipment  is used in powder, graininess and patch delivering upward unpolishing and subpolishing scattered materials whose density is less than 1.5t/m, such as coal, grail, dust coke.

►Selection condition 

    1. What is the conveying material and its physical characteristics? such as bulk density, feeding size, temperature, mositure content etc.

    2. What is the processing capacity of the elevator?

    3. What is the lifting height of the elevator (distance between inlet and outlet)?  

The Advantages of GTS Drum Screen

 Here PK Machinery would like to introduce the advantages of GTS drum screen :
1. wide application and adaptability
2. material feeding method is simple and varied
3. high screening efficiency ,it can be equipped with comb type cleaning structure
4. large screening capacity, easy to be large-scale
5. small energy consumption, long service life, less maintenance
6. low noise, good working environment

GTS drum screen structure: the main structure of drum screen is the sieving drum, which is inclined, the external drum is sealed by a sealing cover to prevent environmental pollution.
Drum screen can be equipped with comb clearing structure, in the process of screening ,the comb cleaning and the drum screen do relative movement to achieve the continuous screening purpose which will make drum screen clean and keep it from sticky, blockage and not not affect the sieving effect.

Pipe Screw Conveyor

 Description

►Customer reference list

CUSTOMER REFERENCE LIST (YEAR 2012-2014)
NO.	EQUIPMENT	VENDOR'S SCOPE OF SUPPLY	QUANTITY	TIME
		PROJECT LOCATION
9	Screw Conveyor	Ukraine	2 Sets	20120829
19	Screw Conveyor	Britain	4 Sets	20130503
21	Screw Conveyor	Zambia	2 Sets	20130508
26	Screw Conveyor	Ukraine	2 Sets	20130924
30	Screw Conveyor	Vietnam	2 Sets	20131108
37	Screw Conveyor	Philippines	2 Sets	20140304
50	Screw Conveyor	Russia	3 Sets	20141103

► Brief Introduction
    GX tubular screw conveyor is bulk material handling equipment, which usually consists of a tube containing either a spiral blade coiled around a shaft (sometimes called an auger), driven at one end and held at the other. The main parts include tube, shaft with spiral blades, inlet and outlet chutes, as well as driving device.

    The closed pipe-type screw conveyor is a pipe with a shaft inside with welded screw blades and passive bearing. The screw’s blades have different pitch which depends on the type of the transported raw material and the planned capacity. This type of conveyor is closed, which means that the screw cannot be accessed directly. Due to the closed structure, the transported raw material does not spill outside the machine during transport. 

    The machine can be equipped with a pull screw. In this version, the drive unit is located in the direction of the raw material feeding. Some screw conveyors are equipped with push screws with gear motor installed on the feeding side. The screw conveyor is fitted with an initial or end bearing. Depending on the type of transported raw material, slide or bearing rests are installed. 

    Horizontal screw conveyor has the advantages of sealed operation, simple structure. screw conveyor suitable for conveying powdery, granular and small bulk materials horizontally or aslope, such as coal, ash, slag, cement, food, etc. screw conveyor is an new transportation equipment

► Working principle
    The screw conveyor consists of power device, gear box, coupling, screw axis and hanging bearing. The screw axis is made of several sections which connected with spline. Hence, the conveyor hold large load capacity and convenient to dismounting. It is open a besel on the casing to ensure a safe operation. 

The material moves along the spiral within the tube. The unique action of the flexible spiral conveyor eliminates the risk of the product separation that can take place in conventional pneumatic conveying systems where mixed materials have components of different densities and particle size.

► Features:

1.Simple structure, good sealing, large capacity, long service life.
2.Convenient installation and maintenance, as well as easy operation.
3.Working temperature is -20~50℃, with material temperature below 200 ℃.
4.Suitable for horizontal and slightly inclined transport of powdery, granular and small lump materials, such as coal, ash, clinker, cement, grain, etc.
5.Widely used in construction, chemical, power, metallurgy, coal and grain industries, etc.

► Advantage :
    1.It can be sealed to prevent the escape of dust or fumes from inside the conveyor; or prevent dust contamination from outside the conveyor.
    2.It can be used to control the flow of material in processing operations which depend upon accurate batching
    3.It can be utilized in the horizontal, vertical or any inclined position depending upon the characteristics of the product being conveyed.
    4.It can be used as a mixer or agitator to blend dry or fluid ingredients, provide crystallization or coagulant action, or maintain solutions in suspension.
    5.Screw conveyors can have multiple conveyor outlets, making discharge to multiple outlets cost effective.
    6.It can be jacketed to serve as a drier or cooler by running hot or cold water through the jacket.
    7.It can be made out of a variety of materials to resist corrosion, abrasion or heat, depending upon the product being conveyed.
    8.It can be outfitted with multiple inlet and discharge points.

► Maintenance :

    1.General Inspection
Routine periodic inspection of the entire conveyor must be established to ensure continuous maximum operating performance. Keep the area around the conveyor and its drive clean and free of obstacles to provide easy access and avoid functional interference of components.
     2.Power Lock Out
Lock out power to the motor before attempting any maintenance. Use a padlock and tag on the drive's controls. Do not remove padlock or tag, nor operate conveyor, until all covers and guards are securely in place.
     3.Removing Screw Sections
Screw sections are typically removed starting with the end opposite the drive when necessary. Remove trough end, screw sections, coupling shafts, and hangers until damaged or worn section is removed. Reassemble conveyor in reverse order.
     4.Coupling Bolts
Periodically remove and inspect one of the drive shaft coupling bolts for damage or wear. Also inspect the coupling bolt hole. The drive shaft coupling bolts transmit more power than successive coupling bolts and will typically indicate the greatest wear. An accurate torque wrench should always be used when tightening coupling bolts. Excessive torque will stretch the bolt and significantly compromise its strength.
     5.Lubrication
Lubricate end bearings, hanger bearings and drive components at the frequency and quantity specified by the individual component's manufacturer. Most types of hanger bearings require lubrication and wear is reduced significantly with a frequent lubrication schedule. Frequency of schedule depends on temperature, type of bearings, type of lubrication, product conveyed, trough load, screw weight, etc.)

     6.Screw Bushings/Internal Collars
The bushing at each end of a screw will wear over time. When possible, check for excessive shaft movement that indicates bushings need to be replaced. Longer and heavier screws typically have greater bushing wear.

  ► Selection condition :
Primary considerations for the selection of a screw conveyor are as follow:
1.Type and condition of the materials to be handled, including maximum particle size, and, if available, the specific bulk density of the material to be conveyed.
2.Quantity of transported material, expressed in pounds or tons per hour.
3.The distance for which the material is to be conveyed.
Below is the necessary information for the selection of a screw conveyor system, presented in a series of five steps. These steps are arranged in logical order, and are divided into separate sections for simplicity.
    The five steps are:
1.Establishing the characteristics of the material to be conveyed.
2.Locating conveyor capacity (conveyor size and speed) on capacity tables.
3.Selection of conveyor components.
4.Calculation of required horsepower.
5.Checking of components torque capacities (including selection of shaft types and sizes)
 

The Selection of Corrugated Sidewall Conveyor Belt

Corrugated sidewall belt is used for pulling and carrying purposes for corrugated sidewall conveyor. It consists of a baseband, corrugated sidewall and baffle. The corrugated sidewall connects with both sides of baseband while the baffle connects with both side of corrugated wall accordingly to a certain space.
1. Baseband 
The baseband appearance of corrugated sidewall belt is the same with ordinary belt ,but its lateral stiffness is greater than ordinary belt. Usually corrugated sidewall belt adopts special belt as its baseband, the tensile materials (core layer) can be divided into four kinds: cotton canvas, nylon canvas, polyester canvas and steel wire.
2. Corrugated sidewall
This series of products using S-type of corrugated sidewall.
3. Baffle
a) This series of product is recommended to use type T, type TS (B), type TC, type TCS (B) and type C baffles.
b) Type T and type TS (B) baffles are only suitable for conveyor angle β≤40 ° while type TC and type TCS (B) and type C of baffles are suitable for conveyors with any transmission angle.
c) Type C baffle is suitable for conveying viscous materials. On the other hand, if the conveying angle and material density are greater, then type TCS (b) baffle should be used.
d) The spacing between baffles is integral multiple of waveform of the corrugated sidewall. The spacing between baffles (TS) and height (H) are related to conveying angle β.  

Belt bucket elevator

■ Description

►Customer reference list

CUSTOMER REFERENCE LIST (YEAR 2012-2014)
NO.	EQUIPMENT	VENDOR'S SCOPE OF SUPPLY
		PROJECT LOCATION	QUANTITY	TIME
15	Bucket Elevator	Russia	1 Set	20121119
22	Bucket Elevator	Russia	4 Set	20130516
31	Bucket Elevator	Yemen	1 Set	20131200
35	Bucket Elevator	Philippines	2 Sets	20140304
39	Bucket Elevator	Mauritius	1 Set	20140500
44	Bucket Elevator	Thailand	1 Set	20140723
53	Bucket Elevator	Australia	3 Sets	20140220

►Introduction

It is designed for transporting vertically for granular, powder and small block of grinding suction smaller disperses the shape material. It adopts belt as the traction component , can reach to max.40 meters . Capacity could be approx. 4~238m3/h .

►Working Principle
The bucket is filled with material and is conveyed to the head terminal, and then the material is thrown from the outlet under the action of centrifugal force according to the parabolic design. The driving device drives pulley to operate the bucket belt in circular motion from bottom to up. After discharging, the empty bucket is back to the boot by conveying and be filled again, and then lifted up to do parabolic motion such repeated cycle. The material is lifted from bottom to the top to the specified height to reach conveying vertically.

►Features

    1.Smooth transmission – no impact caused due to the traction member
    2.Less noise pollution – good sealing sound system
    3.Greater conveying speed due to smooth transmission
    4.Longer life span
    5.Low cost compared with other conveyor for powder materials.

►Advantages

    1.Uses 1 to 4 rows of closely spaced heavy duty seamless steel buckets
    2.Designed steel cord high temperature elevator belt.
    3.Capable of belt speed up to 2.3 m/s
    4.Achieve far greater capabilities per case size then chain (up to double times)
    5.Saves 33% of components costs
    6.Much lower capital investment
    7.Belt wear less than chain
    8.Reduced maintenance and spares cost
    9.Reduces down time and maintenance costs
    10.Throughputs up to 1300 TPH and over
 

►Application

    The vertical belt bucket elevator is widely used in mining , metallurgy , chemicals , power plant , agriculture and quarry etc industries for handling products such as cement, raw meal, alumina, coke, foundry sand, wood chips and other materials.

►Maintenance
    A general belt bucket elevator inspection every six months, mainly on the hopper and belt tightening bolt joints check processing, tightening or replacing bolts. Each belt test once a year to confirm the age of the plastic surface of the belt and the belt strength. Adjust the level of the cylinder head and tail roller to correct the belt deviation. If the deviation is caused by drum plastic surface wear, re-roll the car hanging plastic and rubber surfaces. The rear bearing need to regularly check. Generally, after a long time usage, it will cause wear on slip ring seal. This can cause the bearing oil drip and caused bearing damage. Generally, a good slip ring seal can be used for many years.

    A.Check belt for tears, cuts and etc
Sudden signs of unusual damage call for immediate action.
    B.Check cups for loose or missing bolts
A loose dangling cup is the necessary lever to start a busted belt rip.
    C.Replace belt cups
Cups with a pronounced forward bend hold the belt in a vertical arc, which is a contradiction of forces. When the belt is bent in a horizontal arc around the pulleys, this will cause lengthwise cracks to appear at the bolt holes.
    D.Check belt tension
This is a possible source of drive slippage and excessive wear. Belts running loose in a leg are put to severe flex due to lack of full contact with the boot pulley. A loose belt may swing causing the cups to catch and tear the belt.
    E.Check alignment 
Belts not running true due to out-of-plumb pulleys, idlers or casing cause edge wear and pave the way for costly accidents.
    F.Check slippage on drive pulleys
Proper lagging of pulleys can increase efficiency and belt life appreciably.
    G.Check bucket elevators for uneven loading
This can cause the belt to crawl across the head pulley and cause edge wear or break the belt fabric.
    H.Check boot for water
A belt allowed to sit in water will rot and tear very easily.
    I.Check discharge throat
The throat to the down leg should be closed as much as possible with a piece of rubber belting adjusted close to the cups. This will prevent back legging.

►Selection condition
    1.What are the conveying material and its physical characteristics?
(bulk density, feeding size, temperature, moisture content and etc)
    2. What is the processing capacity of the elevator?
    3. What is the lifting height of the elevator (distance between inlet and outlet)?

How to Identify Counterfeit and Genuine Bearings of Vibration Motor

Due to the special structure principle of vibration motor, the quality and lifespan of vibration motor directly affected by bearings, of course will be embodied in the price level of vibration motor. So it is really necessary to choose a good bearing manufacturer, the following methods will help us identify counterfeit bearings:
1. Packaging
Formal original packing of genuine bearing is comparatively normative which includes inner and outer packaging with unified standard and clear writing. However, the counterfeit bearing packaging material is inferior, printing is rough.
2. Color
Specific parts of genuine bearing present a certain color, for example: chamfer is black, if there is any other colors, it may be counterfeit bearings.

 

3. Appearance 
The writing letters of genuine bearing outer packing adopt special carving or spraying technology design, however, the counterfeit bearing printing is blurry.
4. Material 
Material selection of the genuine bearing is standard steel material, however counterfeit bearing adopts cheap ,fake inferior and unqualified material in order to reduce the manufacturing cost, the weight is light.
5. Processing technology
Genuine bearing manufacturing process is fine which can rotate smoothly However counterfeit bearing manufacturing process is poor with coarse surface ,it can not rotate smoothly.

Gyratory Screen used for Tea was Delivered to India

On September 11th, 2015, one set gyratory screen ordered by our Indian customer was delivered from Qingdao Port. This kind of machine is used to screen tea and its capacity is 100-150kg/h. According to our customer’s requirements, the engineer selected model 5PXZS1236 to meet the needs.

 

Gyratory screen has 5 layers and the size of screen of every layer is 8 mesh, 10 mesh, 12 mesh, 16 mesh, 20 mesh respectively. So this type can meet customer’s demand well. Actually, this business can realize our mutual benefit.

 

In addition, PK Machinery has abundant experience in doing business with foreign customers and exportingvibrating screen, belt conveyor, bucket elevator, scraper conveyor and screw conveyor for many years. We anticipate your enquiry sincerely.

Bucket Elevator Holdback Problems during Operation

While using bucket elevator, sometimes there is abnormal holdback operation phenomenon during operation, do you know the reason?
In fact, during the operation of bucket elevator, sometimes there will be operation stopping inevitably due to malfunction or heavy-loading, even the breakage of link chain or belt could occur, then cause reversal. The reverse operating can cause collision of the bucket and material that remain in the bottom, this could easily cause deformation of bucket and will not function well due to severe damage. Overloading situation is easy to occur if not pay attention to feeding capacity.
Under normal circumstances, the bucket of bucket elevator will lift the material from the bottom to the discharge port which is located on top of bucket elevator and then throw out. In order to ensure the production, when designing and manufacturing equipment, manufacturers just consider that the equipment will not reverse under the non-load condition, because bucket of lower part is two more than upper part, which will be much heavier than the upper. In order to prevent the breakage of belt or link chain or reversal occur in the bucket and link chain, especially when the bucket elevator is under the overload condition, the backstop should be installed at the external of bucket elevator in order to avoid the problem of overload.

 

The bucket elevator holdback consists of reverse rod, revolving shaft, retracting spring and dowel pin etc. In the process of normal operation of bucket elevator, the reverse rod will be upswing after hit by the sleeve, it will fall under the action of retracting spring force, then upswing after hit by another sleeve, not affecting the normal operation of equipment. If there is reversal of bucket elevator, the dowel pin will halt the reverse rod, so it will no longer swing down, and the sleeve will also be blocked by the reverse rod, hence the whole link chain could not reverse. If there is too much material spilled inside the body of machine and fall on the reverse rod, it will cause the failure of holdback. 

If there is too much materials outside the bucket elevator, it will affect the rotation axis of screw. We may see there will be stacked with material in the pit of bucket elevator on the user’s site, which will seriously affect the operation of the relevant parts of holdback.