The Cause of Bearing Premature Failure

Bearings is a small part which can fix and reduce load coefficient of friction during the processing of mechanical transmission. No matter vibrating screen, belt conveyor, bucket elevator or scraper chain conveyor, bearing is always one of their important parts. However, there is premature failure phenomenon during using. So we will introduce the cause of the bearing premature failure.
Improper installation
A big number of the premature failure bearings are cause by improper installation or the users haven’t realized to use correct installation tools. For correct and effective installation and disassembly,different installations may require mechanical, hydraulic or heating method. Based on professional engineering service technical knowledge, special tools and professional installation, you can get maximum machine trouble-free operation time.
Improper lubrication
Although we do not need to consider this problem if using” free- maintenance” bearing, there are still 36% bearing premature failures are due to incorrect technical parameters of lubricant. Inevitable result is that the bearing lacks of correct lubricant, which will fail prematurely. As bearing is the most difficult part to be accessed in the whole machine, neglecting lubrication may cause all kinds of problems
Pollution
Bearing is a precision part, they can not work efficiently if they can not keep away from the pollutant. At least 14% of all bearing premature failures are due to pollution problem. 

2016 PK Machinery will Write a New Chapter

As an old saying goes: a year's plan stars with spring. Along with the festive sound of firecrackers, PK Machinery has hold the opening ceremony in this spring. At the beginning, the leader gave a speech to stress that hoped all staff could be united as one to greatly promote the development of our company and believed that we can make a great achievement in 2016.

After that, we also received a red envelope, all of us are permeated with a smile on faces and our vision of the future. At the same time, we invited drum corps and dance group to show performances to celebrate the opening ceremony. The scene was very lively and exciting. 
New year has new atmosphere, we believe our business will reach a new level! 

Rotary & Linear Vibrating Screens for Pegmatite were Delivered to Namibia

Yesterday,linear vibrating screen and rotary vibrating screen were dispatched to Namibia from Qingdao China,before leaving factory,client came to PK Machinery for inspection all items and watched the trial run,he spoke highly our equipment and expressed his desire to cooperate again in the near future.
The screens handle 50 tons pegmatite material per hour feeding rate in total,detailed information shown as follows:

Linear vibrating screen
Model:2ZSH1536
QTY:3 units
Construction:carbon steel
Type:vibration exciter type
Deck: double deck with opening 1 and 0.5mm
Motor:Y132M2-6,2*5.5kw,380V50Hz3phase

Rotary vibrating screen
Model:XZS-1800-2S
Deck:double deck with opening 0.210 and 0.09mm
Construction:material contacts parts are SUS304

Hope above information can be helpful if you have similar sieving problems.Further information please click:www.pkmachinery.com

2015 Winter Games was Held at PK Machinery

Last week, for the purpose of arousing the staff’s enthusiasm effectively and enriching their lives, PK Machineryhas carried out winter games. Meanwhile, this winter games have achieved great success.

In the beginning, the leader of our PK Machinery gave a speech to present the spirit of our company and explain activity rules, after that we started games competition. This winter games include 6 items which were tug-of-war contests, rope skipping, set shot, hold the ball race, across the “river” by touching the bricks and ride a bicycle slowly. All of us were involved in the winter games and the atmosphere during the games kept warm and high all the time. In the end of the winter games, we selected the winners of each game and awarded prizes for them. Through this winter games, we became a more united and stronger team.

During our working time, we also have many activities like this. PK Machinery has done better and better to enrich our life and promote our company to develop better.

How to debug linear vibration sieve?

1. Linear vibrating screen generally adopts three-phase alternating current. Please ensure correct power supply connection ,no conductive material, specialized alternating current socket.
2. The base must be fixed firmly by bolt to guarantee a same height difference front and back supporting seat , the feeding end and discharge end in a horizontal plane, otherwise screening effect will not reach the requirements of qualified products.
3. Check the flatness of screen mesh, ensure screen mesh is installed on the frame correctly, keep the screen mesh in the same horizontal plane to prevent screen tilt, and screening materials not up to the ideal state.
4. Check the each component of linear vibrating screen to ensure they’re firm and reliable, all the bolts must be tightened without looseness.
5. Ensure there is 30-50mmgap between linear vibrating screen and the surrounding fixtures, and check whether screw is locked well or not.
6. Take off the transportation support before starting up the linear vibrating screen, and add the support again until the vibrating screen operation becomes normal.
7. Pay attention to observe the material trajectory after starting up, adjust the screening state according to the material screening trajectory. 

5 methods to solve vibration motor frequent trip problem

Almost everyone knows the basic operation of vibration motor, but there are some points we need notice in the process of operation,especially the vibration motor frequent trip problem, according to our technical personnel’s experience, now we introduce some methods to avoid the trip for your reference:
1.Capacity unconformity or aging of vibration motor air switch and overcurrent protective device, just change the switch will solve the problem.
2. The wire cable skin of vibration motor is broken ,this is mostly due to wear and tear during long period use,it can be wrapped with tape.
3. Bearing damages or lacks oil,lead to overload trip.Thus we should replace the bearing timely.
4. Vibration motor power supply doesn’t work,or circuit breaker gets aging.
5. The magnetic circuit performance of vibration motor decline,causing too much current.
The above several problems are relatively simple to handle,according to the corresponding reasons, users themselves can solve them through adopting corresponding methods. If the trip of vibration motor is not caused by the above several reasons, please do not hesitate to contact with us,our engineer will solve the problem for you.

Factors affecting the efficiency of screw conveyor

Main factors influencing the efficiency of screw conveyor:

1. Material viscosity, easy caking. Material viscosity,material is prone to sticking to the blades and conveyoron the inner wall, making large resistance change in thematerial handling process, a direct impact onproductivity.

2. Spiral pipe diameter size. Under the same conditions,of large diameter conveyor transmission efficiency thandiameter small throughput and higher efficiency.

3. Angle of screw conveyor and transmission distance.

4. Material particle size, temperature, moisture,abrasion and corrosion. Specific parameter can refer to:technical parameters of screw conveyor and conveying calculation formula.

5. Screw conveyor speed. Screw conveyor speed relates to the motor of the conveyor's size. Screw conveyor speed has a close relationship with material properties. High speed screw conveyor Assembly is strict, but also better balance.

What Factors that Affect the Screw Conveyor Conveying Efficiency ?

The factors are listed as follows:
1.The material has great viscosity and is easy to agglomerate. 
The viscous material is easy to stick on the screw blade and the inner wall of the screw conveyor, which will increase the resistance in the process of conveying, and directly affect the production efficiency.
2.The diameter size of the screw pipe.
Under the same conditions, conveying efficiency of the screw conveyor with larger diameter is higher than the conveyor with small diameter.

3.The dip angle and transportation distance of screw conveyor.
4.The particle size, temperature, moisture, abrasion and corrosion of the material.
Specific parameters can refer to: Screw conveyors and conveying technical parameters calculation formulas.
5.The rotate speed of the screw conveyor.
The rotating speed of the screw conveyor is related to the power of conveyor motor . The working speed of screw conveyor has a close relationship with the material characteristics. High speed screw conveyor requires strict assembly, and demands a better balance. 
Further information,please click:www.pkmachinery.com

Introduction of Circular Vibrating Screen

Circular Vibrating Screen is a kind of new and highly effective vibrating screen that does circular vibrations and has multiple layers. Circular vibrating screen adopts cylinder postures eccentric block to produce strong exciting force. Its main body is connected by high strength screw bolts. A circular, elliptical vibration motion is created in order to sieve the materials efficiently. It is composed of screen box, screen mesh cloth, suspension (or support) device, underframe and motor.

circular virating screen

► Working principle
Circular vibrating screen separator uses eccentric block(YK type)/eccentric shaft(YA type) to produce strong exciting force, due to the unbalanced centrifugal force of inertia of the weights on the exciter, screen box vibrates, it can obtain different amplitudes by changing the exciter eccentric weight.
► Application
Ore circular vibrating screen is available for smelting , quarry , coal preparation, ore dressing, energy, power, chemical industry,construction material.
► Features
   1.Simple structure, easy maintenance, high production efficiency
   2.Using large clearance bearings and lubricated with thin oil, little noise and long service life
   3.Sieve beam and screen box adopts high strength bolt connection, no welding processing
   4.Small amplitude, high frequency, large dip angle structure to enable high screening efficiency and great handling capacity.

circular vibrating screen

► Advantage

    A.Common features and performance of our Circular Vibrating Screen

        1.High screening efficiency 

        2.Strong vibration force created

        3.Adoption of punching sieve or steel made screening mesh in order to prevent blockage.

        4.Screen body connected by using high strength screw bolts.

        5.Adopts spring steel woven mesh or perforated sieve-plate, which is helps to prolong the service life and prevent blockage.

        6.Rubber vibration spring is used to reduce noise pollution and provide smooth vibration operation. 

 

    B.Drive and Mounting of Circular Vibrating Screen
 

 Drive is by electric motor and cardan shaft to the main drive shaft equipped with a single unbalance weight where required additional v-belt can be provided. The drive shaft is mounted on heavy duty roller bearing sets, lubricated with grease or oil. Like the linear vibratory screens, circular vibrating screens are mounted on reinforced rubber springs to prove the same benefits in performance and longer lifespan.

What Should We Pay Attention to the Selection of Vibrating Screen Coupling

Vibrating screen coupling is commonly used in mechanical transmission components. It is used to put two shaft coupling together, a component which cannot separate with rotation and transmission torque of two shafts when the vibrating screen is running; only after the machine stop and after joint apart, two shafts can be separated. Coupling is a kind of standard part, when using we can choose coupling according to the requirements of national standards and the using requirements.

 

Due to the manufacturing and installation error, two shafts of coupling connection may occur deformation after bearing and the influence of temperature change, often cannot guarantee strict centring, however, there is some degree of relative displacement. So choose cross coupling between the reducer and the clutch, oldham coupling is composed of two end surface fluted half coupling and the middle plate of protruding teeth both sides. Because convex teeth can slide in groove, so it can compensate for the relative displacement between the two shafts in installation and operation. This kind material of coupling parts can be available for 45# steel, work surface needs heat treatment to improve its hardness. It is also available for Q275 steel when the requirement is lower, no heat treatment is required. In order to reduce friction and tear, when using we should lubricate from the oil hole in the middle.
Because sliding pair is consist of half coupling and the middle plate, which can't occur relative rotation, therefore, angular velocity of the drive shaft and the driven shaft should be equal. But when there are relative displacement between the two shafts, middle plate will generate a lot of centrifugal force, which will increase the dynamic load and wear. Therefore when we choose coupling, we should pay attention to that working speed shall not be greater than the specified value. 

Introduction of Gyratory Vibrating Screen

►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. 

gyratory vibrating screen

► 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.

gyratory vibrating screen motor

► 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.