Introduction of Motor IP Grade :The Meaning of First Number

Motor IP (INGRESS PROTECTION) grade system is drafted by IEC (INTERNATIONAL ELECTROTECHNICAL COMMISSION ).IP grade is composed of two numbers, the first number represents for anti-invasion grade of external objects and dust, the second the number shows that the sealing degree of anti- invasion of moisture and water, if the number is greater, the degree of protection will be higher.
0: no special protection
1: it can prevent external objects with solid diameter larger than 50 mm entering into the casing.
2: it can prevent external objects with solid diameter larger than12 mm entering into the casing.
3: it can prevent external objects with solid diameter larger than 2.5 mm entering into the casing.
4: it can prevent external objects with solid diameter larger than 1 mm entering into the casing.
5: protection against dust, it can prevent dust from entering to affect the normal operation of the product, and prevent dust contacting the inner casing or parts.
6: sealing against dust, it can completely prevent dust from entering into the casing and prevent the dust contacting the inner casing or parts.

Great Changes in Technology of Conveyor Belt

With the development of scale of mine, belt conveyor has kept on towards large scale and presents features of large capacity and long distance. Belt conveyor with long distance and multi power has achieve successful research and development, it changes the single load-carrying way that is given by rollers and adopts multipoint electric drive. This method can address the traditional problems that are changing conveyor belts frequently and belt breakdown easily. Also, the successful development of this kind of belt conveyor can reduce the cost of equipment greatly. What’s more, its advantages are reducing thenumber of transshipment or fall of ore during operation and avoiding environmental pollution.

 

The successful development of belt conveyor with 1km-100km belt length, adopting multipoint electric drive which can reduce 10%-30% investment and operation cost. Especially, it can decrease belt strength and eliminate risk of tapebreak of upward transport belt conveyor with large angle and long distance. And then it can prolong the lifespan of belt more than 5 times. Multi-power belt conveyor not only can achieve the goal of lower investment, lower consumption and resistance, but also operate stably more than 10 years. In this way can it improve the running rate and economic benefit greatly.

Common Troubleshooting Methods of Vibration Motor

1. after connect the power supply, motor is unable to start, please check:
(1) if power supply is lack of phase;
(2) if motor is loss of phase;
(3) if protective cover is damaged or rub eccentric block.
2. after start-up, there is big motor noise or motor heats, please check:
(1) if the contact surface roughness of vibration machine and motor foundation is in line with the installation requirements;
(2)if the anchor bolts are not tighten up ;
(3) if the vibration acceleration is in line with the requirements;

3. after the adjustment of eccentric block, amplitude changes abnormally please check:
If eccentric block on both ends of the rotor axis is symmetrical;
4. when two vibrating motors of vibration machine vibrate at the same time, if its phase does not conform to the requirements, please adjust the phase sequence of the single unit, don't adjust the total phase sequence of two vibrating motors.

 

Vibrating Feeder

■ Description

►Customer reference list

CUSTOMER REFERENCE LIST (YEAR 2012-2014)
NO.	EQUIPMENT	VENDOR'S SCOPE OF SUPPLY	QUANTITY	TIME
		PROJECT LOCATION
29	Vibrating Feeder	Vietnam	2 Sets	20131107
54	Vibrating Feeder	Pakistan	2 Sets	20140220

► Brief introduction:
Vibrating Feeder is a kind of linear direction feeding equipment, It consists of feed spout, vibration body, vibrating motor, damping device. It can feed material for belt conveyor, vibrating conveyor, bucket elevator, vibrating screen, crusher etc.

► Working principle:The feed process of the vibrating feeder is achieved by the feed spout do line reciprocating vibration periodically which is forced by the special vibrating motor. When the vertical component of the feed spout vibration accelerated speed is bigger than the gravitational acceleration, the material will be upthrow and jumping forward along a parabolic path. Because of the continuous exciting of the vibrating motor, the feed spout will
Vibrating continuously and the material in the feed spout will jumping forward continuously, so that achieves the purpose of feeding material.

► Features:

   1.Smooth operation, large feeding capacity with high efficiency.
   2.Low energy consumption.
   3.Characterized by even feeding, excellent continuity and adjustable vibrating force.
   4.Eccentric block as the main source of vibration.
   5.Double screening and embodies the functions of dirt removing, screening and feeding.

► Advantage:
      Stable vibration, reliable operation and long service life;
      The excitation force and materials quantity moving in the feeder can be adjusted conveniently and easily.
      The vibrating motor, as the excitation source, has low noise, small power consumption, good adjusting performance and without material splash.
      Simple structure, reliable running, convenient installation, light weight, small size, easy maintenance, and the enclosed type can prevent dust pollution.

► Application:

      ZG Vibrating Feeder is a kind of linear direction feeding equipment, which is widely used in pharmaceutical, automotive, electronic, food processing, packaging, glass, steel, construction, recycling, plastic industry etc.
 

► Operation and Maintenance:

      A.Problems occurring in Vibratory Feeders
Four basic malfunctions that bring attention to vibratory feeders need to be concern:
    1.Declining feed rate due to low amplitude. This will occur gradually over a period of time.
    2.A dead spot in the bowl – parts will not feed past a certain point in the bowl, even though they are moving elsewhere in the bowl.
    3.Intermittent operation. The feeder will spontaneously run at excessive amplitude or possibly no amplitude without apparent cause. Included in this category is for a feeder not to work at all.
    4.Noise from the vibrating feeder.

       B.Overhaul and Readjustment of Vibratory Feeders

   Here are the methods to solve the problems:
       1.Remove the bowl, and clean the mating surfaces between the bowl and the top casting of the base.
      These surfaces can accumulate dirt, sometimes, and other material that will make it difficult to draw the bowl tightly down on the top casting of the base. These surfaces should be flat and clean. Using emery paper or a flat file is adequate to recondition the surface.
      2.Operating on one bank of springs at a time, loosen the springs top and bottom and remove them.
      Both ends of each springs, as well as the spacers and mounting surfaces should be thoroughly cleaned with either emery paper, a wire brush or glass bead shot peened.
    3.Examine each spring for cracks and corrosion
The cracks will always occur adjacent to the hole punched in either end, on this type of spring. Sometimes these cracks are not visible to the naked eye, and a simple test is to hit the spring on something solid (dropping it on the floor). Usually this will cause the spring to break thru.
    - Any pitted springs or spaces should be replaced.
    - Reassemble the springs and spaces in the manner in which they were prior to disassembly.
    - Draw up the screw snug.
    - Do this on each remaining banks of springs.

What is the Applicable Material for Drum Screen

Drum screen is a kind of cylinder revolving screening machinery that relies on gravity, its working principle is different with rotary vibrating sieve, linear vibrating screen, drum screen can generate strong exciting force, so if dealing with the proportion of lighter materials, it is not suitable for drum screen, the screen is easy to get blocked due to the irregular shape material, and the most important is the screening effect is bad, so what is the applicable material for drum screen?

 

Drum screen also is often used in mining, sand ,gravel industries, common screen mesh size can be larger than 5 mm, the smallest mesh size should larger than 3 mm, if the mesh size is smaller that is the wire mesh is small ,the service life will be shorter, besides, the drum screen doesn’t do a good job for on sieving fine material and the sieving efficiency is not very good.

 

Except for sandstone, drum screen is also more commonly used for granular material screening, such as: chemical fertilizer, ceramsite and so on. The sieving efficiency is good and easy to handle large-scale capacity. 

commissioning of bucket elevator for glass

How to Maintain Vibrating Screen in Summer

In summer, excess temperature is a hidden danger of daily operation for vibrating screen, generally speaking, working requirements of the environment temperature is not more than 40 ℃, so during the daily operation of vibrating screen, what we should concern about is not only the process of production, but also the degree of temperature that the vibrating screen can bear.

For the outdoor working conditions, a anti-sunshine net or cover should be set up for the vibrating screen.

Long-time sun exposure not only make the machine easy to get aging, but also cause the vibrating screen can not work normally due to the high temperature which will affect the screening efficiency and quality, it will even lead to a serious component damage, such as the damage of vibration motor.

For the indoor working condition or vibrating screen works in an ore processing plant, please pay attention to the adjustment of the indoor temperature, as well as the ventilation and the permeability, generally, a good working temperature is not more than 40 ℃.

Circular Vibrating Screen

 Description

► Introduction 
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.

► Working principleCircular 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.

► 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.

The Classification and Function of Rotary Vibrating Screen Sealing Ring

As we all know, rotary vibrating screen does a good job in food, chemical, ceramic, paper making, metallurgy industries, as well as its components sealing ring which plays an important role to ensure the sealing performance of rotary vibrating screen.

Generally speaking, sealing ring can be divided into two types: U type and V type, it is mainly used for screen frame, net rack and dust cover to ensure better sealing performance and prevent leakage of material, at the same time it can reduce the destructive force to screen frame that rotary vibrating screen brings in vibration.

 

Sealing ring is commonly made of rubber, silicone and polyurethane, if there is no special requirement, it will be equipped with rubber sealing ring; Silicone and polyurethane sealing rings are mainly used for materials with special properties, such as high temperature, oil, corrosive materials. Among three types of sealing rings, the silicone sealing ring has a better sealing effect.

 

 

Inclined soda ash scraper conveyor for Pakistan

Silicon Carbide Rotary Vibrating Screen Site Operation Feedback from Iran Client

We were delighted to receive the feedback from Iran Client concerning the site operation of rotary vibrating screen which was ordered in the year of 2014.

The rotary vibrating screen was designed for 3~5t/h capacity of silicon carbide, the density is 2-3.2 g/cm3,water content:2~5%,material size:<1mm,as per the screening material, our engineer selected 3 units of XZ1200 rotary vibrating screen with 3 layers to meet the requirement, the material of screen mesh is SUS304,mesh size of 1st: 0.106mm, 0.075mm, 0.063mm;mesh size of 2nd unit: 0.18mm,0.15mm, 0.125mm;mesh size of 3rd unit: 0.3mm,0.25mm, 0.212mm.

 

Iran client said that they were quite pleased with the machine, both the screening efficiency and screening accuracy were higher than the vibrating screen they ever used. At the same time, we also received a site photo after the screens were installed from client, they said after being put into use, screens ran quite well as they strictly operated according to the operation manual, furthermore, they expressed that they would like to order some spare parts, such as screen frame, screen mesh ,sealing ring and bouncing ball etc. Both of us hope to cooperate again in the near future.

The Reason Why Circular Vibrating Screen can not Start up or Amplitude is Small

Circular Vibrating Screen is a kind of new and highly effective vibrating screen that does circular vibrations and has multiple layers which is available for smelting , quarry , coal preparation, ore dressing, energy, power, chemical industry, construction material. Here PK Machinery will introduce the problem we may meet during the operation of circular vibrating screen.

The reason why circular vibrating screen can not start up or amplitude is small

1. Low voltage
2. The control circuit of electrical components damage
3. The motor damages
4. The motor occurs failure
5. Too much materials are piled up on screen surface
6. Grease caking inside the motor 

The solution to slove circular vibrating screen can not start up or amplitude is small

1. Change the power supply
2. Replace the electrical components
3. Replace the motor
4. Maintain the motor
5. Clean up the materials on screen surface
6. Clean the motor, add proper grease
 

 

Testing of screw conveyor for Singapore

The Application of Vibrating Screen in Ceramic Industry

Vibrating screen is widely used in abrasive, ceramic building materials, foundry industry, food, paper making, metallurgy, pharmaceutical, environmental industries, however, concerning the ceramic industry, how much do we know ?

 

Exquisite porcelain calcining technology is very strict to the requirement of raw materials, in the screening process of ceramic materials, generally, the particles are required to be sieved in a high precision, due to the choice of the vibrating screen should contain a variety of elements such as: granular distribution, density, water content, viscosity, temperature and capacity, etc., you can select different vibrating screen as per different raw ceramic materials as follows:
1. rotary vibrating screen is suitable for the requirement of high precision material and small production output.

 

2. ultrasonic vibrating screen is suitable for the requirement of high screening efficiency.

 

3. linear vibrating screen is suitable for the requirement of large output and precision is not as good as rotary vibrating sieve.

Linear Vibrating Screen

 Description

►Customer reference list

CUSTOMER REFERENCE LIST (YEAR 2012-2014)
NO.	EQUIPMENT	VENDOR'S SCOPE OF SUPPLY
		PROJECT LOCATION	QUANTITY	TIME
1	Linear Vibrating Screen	Russia	1 Set	20120121
6	Linear Vibrating Screen	Ethiopia	2 Sets	20120428
12	Linear Vibrating Screen	Namibia	3 Sets	20121000
36	Linear Vibrating Screen	Philippines	2 Sets	20140304

► Introduction Linear vibrating screen is designed with dual-vibration motor drive.Two synchronous motors are reversely placed so that the exciter generate reverse excitation force, the exciting force generated by eccentric block cancel each other out on the parallel direction of motor axis,and stack together with the perpendicular direction of motor axis, so its trajectory is linear.Linear vibrating screen is suitable for particle size from 0.074 -5 mm,the maximum size should be less than 10mm.

► Application:
Linear vibrating sieve is widely used in mining, coal, refractories, metallurgy, building materials and other industries. Mineral linear vibrating screen is usually used for the screening and grading materials in large, middle and small particles.

► Feathers
-Less energy consumption,lower noise,longer service life
-The beam and screen box are connected by high strength blot without welding
-High accuracy screening efficiency
-Simple and stable structure, convenient maintenance

► Advantages
     A.Common advantages and features of our Linear Vibrating Screen
         1.Suitable for rough screening with high capacity.
         2.Long travel distance for materials on the screen surface, high screening efficiency.
         3.Parallel transportation of materials while screening.
         4.Adjustable inclination of screen surface.

     B.Drive and Mounting of Linear Vibrating Screen
         Drive is achieved by electric motor with carden shaft to the drive shaft equipped with twin unbalance adjustable weights where required additional v-belt drive can be provided. The number of exciters is increased according to screen width and two models are available with the exciters arranged above the screen or below depending on application.
Each unit is mounted on hollow, reinforced rubber springs which reduce noise levels, reduce dynamic forces, have optimal expansion and contraction properties without the need for bump stops and dispense with the need of a counterswing frame.

► Selection condition

1.What's the capacity you required? 
2.What's the material will be separated? 
3.How many layers do you need? 
4.What's the sieve mesh size of every layer? 
5.What's the particle size distribution?
► Operation and Maintenance

      A.Maintenance of Vibration Motors of the Linear Vibrating Screen

The Linear Vibrating Screen requires limited preventive maintenance. However, there are a few steps to follow to ensure years of trouble free service. In general, you need to complete a common sense inspection of the structure, vibration motors, etc. on a daily basis. Daily inspection on the screens for wear or holes is needed. If damages occur, repair or replace as necessary. The vibrator motors must be greased with lubricating oil. Over greasing causes overheating of the bearings and this must be avoided. Besides, use only prescribed grease in vibrator motor. If different grease is used, vibrator can be damaged and warranty will be voided. Use only prescribed amount of grease to lubricate vibrator. Too much grease will cause the bearings to overheat and result in premature bearing failure.

      B.Precautions during the Installation of Screening Mesh on Linear Vibrating Screen

The process during installation of screening mesh on linear vibrating screen is very important as it will affect the durability and the operation function of the mesh. Here are the precautions during the installation and choosing of screening mesh:

      1.The coarser the diameter of the screening mesh, the better the screening efficiency. Coarser diameter of screening mesh is preferable as the process during the installation of screening mesh is more tedious.

      2.While cutting the screening mesh, make sure that the width of the screening mesh and the mesh frame is consistent. The length of the screening mesh must exceed 50 to 70 mm compare to the mesh frame.

      3.During the process of installation, make sure that the screening mesh is tightening as this will affect the screening efficiency.

      4.While installing the cleaning mesh device with the bouncing balls, the difficulty of screening efficiency and the size of screening mesh must be consider. 

      5.If there is large quantity of materials and if the size of screening mesh is larger, supporting net should be installed under the screening mesh. This is for supporting purposes by reducing the pressure on the screening mesh. Besides, this will prolong the life span of the screening mesh.

      6.After the mesh frame assemble with the screen box of the vibrating screen, remember to slip the extra part of the screening mesh into the discharge port in order to avoid mixing of materials.

      7.During the installation of the platen, pay attention of the flatness of the platen. Then, use the foam sealing tape to seal it. This is to prevent mixing of materials and to extend the life span of the screening mesh.

      8.After that, conduct the screening test by using some materials. Make sure that the movement of the materials is in linear motion while the machine is working. If problems occur, checks whether the screening mesh is being tighten or not.  

      C.Malfunction Analysis of the Linear Vibrating Screen

The principle of the operation of Linear Vibrating Screen is very simple. But, due to time consuming, malfunction of the machine will happen. There are five common malfunction of linear vibrating screen:

      1.Linear vibrating screen might not operate or the vibration amplitude is too low. If you are facing this kind of situations, check the accessibility of the motor and make sure that the voltage of the electrical circuit element is in a normal condition. Besides, you need to make sure that there is no over accumulation of materials on the screen surface. Check the exciter coupling bolts. If the bolts loosed, tighten it. Check whether the grease is caking or not. At the same time, you can clean the overhaul shaker and then adjust the position of the eccentric shaft or the vice eccentric position.

      2.Uneven spreading of materials on the screen surface. This might be cause by low rigidity of the screen box, and loosening of the coupling bolts. Besides that, the horizontal screen box is unable to identify. The problem might be cause by the malfunction of the spring supporting seat and the spring. This problem can be settled by changing a new spring or change the bearing size. Other than that, uneven spreading of the materials might be cause by damage of the screening mesh. Change the screening mesh will do. 

      3.Poor sieving efficiency due to improper operation procedure. Clogging of materials on the sieving mesh and increase in the water content of the materials might reduce the sieving efficiency. Increase in the quantity of the fine materials will affect the sieving efficiency too. Another problem that causes poor sieving efficiency is the screening mesh. Both sides of the screening mesh must tighten. 

      4.Rotation of the linear vibrating slowed down and heat up the bearing. If this kind of situation happened, grease or lubricating oil should be applied. If same thing happen again after the grease oil is added, this might be cause by the quality of the grease oil. Bad quality of grease oil will cause the bearing to jam. 

      5.Cracking at the side wall of the linear vibrating screen, beams broken, damage of some structural part. These usually happened due to long working hours of the