What is the selection notice of rotary vibrating screen?

1.Size of working area: rotary vibrating screen is circular, sieve surface area will effect of screening yield, so screening efficiency and yield can be improved by increasing the screening area. So the size of the field is one of the keys to the vibration screening.
2.Material characteristics: material properties,flowability and size.
3.Construction material : because of the different sieving materials, the construction material is also different, for example: food, salt, sugar and other related food industries, the whole machine material is SUS304. One reason is that hardness,thickness and wear resistance of 304 material are better, besides, polished stainless steel is bright like a mirror, the surface is clean and health, maintenance is very convenient which do not affect the material quality after screening. If the material is chemical, metallurgical and other raw materials, you can choose Q235 material, which not only save cost but also not affect the use.
4.Screen mesh can be divided into two kinds: stainless steel and carbon steel.
The shape and size of rotary vibrating screen are different generally based on the actual application and the on-site condition, and can be designed according to the requirements of clients to meet special circumstances. Common types of rotary vibrating screen: XZS-800mm, XZS-1000mm, XZS-1200mm, XZS-1500mm, XZS-1800mm, etc. 

What factors affect vibrating screen purchase?

Please consider the following factors when purchase vibrating screen
A.Physical property of the material
Including material particle size, shape, moisture content, bulk density ,property ,etc. When the particle size is fine and mesh size is small, the screen efficiency will be lower, we need to select larger model for same capacity; when the moisture content is big, in general, the screen efficiency will be lower. However,if the mesh size is bigger, the influence of moisture content will be less; when the material with corrosion property, the material contacts parts usually need to be SUS 304 or whole machine is SUS304.

 

B.Screen surface character and structure
In general, if the material do vertical movement on the screen surface (such as linear vibrating screen,etc), the screen efficiency will be higher and the capacity is larger. If the material do reciprocating movement on the screen surface (such as gyratory screen,etc),the screen efficiency and capacity will be lower.
For certain material, the screen efficiency and capacity rate are determined by the mesh size. The screen efficiency is determined by the screen surface length, the longer screen surface length is, the higher screen efficiency will be; the capacity rate is determined by the screen surface width, the bigger screen surface width is, the higher capacity rate will be. 
C.Production condition
The screen efficiency will be lower when the load on the vibrating screen is big.Uniform feeding material also has a big influence on the screen efficiency. (For this question, PK Machinery designs a distributor above the inlet of vibrating screen to achieve uniform material feeding).
Only when we take all above factors into consideration,will we get a suitable vibrating screen that can meet our production efficiency. 

How to Select the Driven Device for Linear Vibrating Screen ?

Linear vibrating screen can achieve dry and wet screening,and also can achieve automation work on the working site. Here PK Machinery will talk about the driven device selection for linear vibrating screen. 
With regard to the material like ceramic, food, etc with small density,capacity and vibrating screen model, generally the screen surface length is <3000mm, screen surface width is <1200mm, and the weight of the vibrating screen is relative light, under such circumstances, the driven device of 2 sets vibrating motors rotate oppositely at the same time will be adopted. Motor installation on the bottom, upside or both sides of the screen equipment can be optional.

While the material like coal, mineral, building material, etc with large density, capacity and the required vibrating screen model, generally the screening surface length is >3600mm, screen surface width is >1500mm, and the weight is heavy. Under such circumstances, the driven device of 2 sets motors drive 2 sets vibrating exciter will be adopted. Vibrating exciters will rotate in different directions which can be installed on the bottom or the upside, then produce vibrating exciting force to achieve screening. 
If the working site’s installation space is limited, or there are some special requirements, we could optimize the design. 
If you have  any interest,welcome to contact us via info@pkmachinery.com or www.pkmachinery.com 

What's the Special Role of Vibrating Screen Bouncing Ball?

When the vibrating screen works, have you ever noticed that the bouncing balls beat up and down on the sieve mesh? Why this phenomenon occurs on the sieve mesh? What's special role of bouncing ball? Today we will take a brief look.
These bouncing balls are an essential part of vibrating screening machines.Its role is beating the sieve mesh up and down avoid adhesion material blocking the sieve mesh which can improve screening efficiency and accuracy.

Bouncing balls are generally divided into different diameters: φ10, φ15, φ20, φ25, φ28, φ30, φ40, φ50, φ60 and so on, commonly used ones are φ25 and φ28 , φ40, φ50and φ60 mainly used for mine vibrating screen.
According to the material,bouncing ball can be classified into several types: rubber ball, silicone ball, PTFE ball bouncing, according to different materials of bouncing balls, the application and function is also different.
Natural rubber bouncing ball：it is suitable for general material screening process;
Silicone bouncing ball：good elasticity., mainly used for food, medicine and other materials screening;
PTFE bouncing ball : It can soak in the oil , mainly applied to oily liquid materials screening.
The bouncing balls should be selected based on different material properties to meet customer requirements in different conditions. Though bouncing ball is a small accessory, it is the key to solve the problem of screening.

The Tin Powder Screening Problem for Ultrasonic Vibration Sieve

1.The output powder efficiency of ultrasonic vibration sieve is low, there is no finish powder or less after sieving, if this kind of situation appears, we need to check the performance of ultrasonic acoustic, whether it is due to the poor quality, resulting in screen mesh blockage, causing the finished powder cannot be sieved out.
2.Larger and smaller size of tin powder exceed the standard, when confronted with the problem, we first need to check screen mesh of ultrasonic vibration screen, uneven powder size mostly may be due to poor quality of screen mesh, aperture size is not same when manufacturers make the screen mesh, or some parts of screen mesh are damaged after long time use, here it requires us select standard and qualified screen mesh from the regular manufacturers, regular check of screen damage is also required.

3. The oxygen content of tin powder is excessive of the standard, it is mainly because of poor sealing ,which lead to air leakage, it is necessary to ensure good sealing and check whether the sealing ring and other sealing place are qualified or not, vibration sieve rubber sealing ring after long time use, it will occur deformation or a series of problems which results in the increase of oxygen content in tin powder. Therefore, check the sealing ring regularly, especially in the case of high temperature in the summer.
4. Unstable ultrasonic vibration screen will cause the screen mesh heating and screen plugging seriously, before using ultrasonic vibration sieve, please select and set the vibration motor power well, check the equipment adjustment flexibility and check if discharging outlet is smooth or not.

 

For points listed above, you will find the tin screening is a impregnable problem. As a senior research, development and production manufacturer, Henan Pingyuan Mining Machinery Co.,Ltd has devoted to solve all the screening problem, we are sure we will be the best choice, more information please click: www.pkmachinery.com

Difference between ultrasonic vibration sieve and ordinary rotary vibrating screen

Compared with rotary vibrating screen, ultrasonic vibration sieve is equipped with a ultrasonic generator, with self-cleaning function ,the mesh is not easy to block, it is no need to add bouncing balls and other anti blockage device. Ultrasonic vibrating screen is particularly suitable for screening fine powder and light weight material with mesh size larger than 300 mesh. 

 

Ultrasonic screening system is composed of ultrasonic resonant power supply, oscillator and resonance ring. The ultrasonic resonant powder supply will generate longitudinal oscillating wave which will transmit to the resonance ring to produce a resonance, and then the vibration will be transmitted to the screen mesh evenly through the resonance ring. While material on the screen mesh does three dimensional vibration movement in the low-frequency, it will overlap the ultrasonic vibration which can prevent the mesh plug and improve the screening yield and screening quality. 
The performance characteristics of ultrasonic vibrating screen: it can sieve the heavy, light, ultra-fine, strong adsorption powder (almost all of the powder is effective) that ordinary rotary vibrating screen can’t sieve. Compared with ordinary rotary vibrating screen, the material passing rate of ultrasonic vibrating screen will be increased by 50%-400%, the performance is as follows:
(1). Reduce screen mesh cleaning time;
(2). No pollution of powder that generated by bouncing ball and other auxiliary materials;
(3). Keep the screen mesh size, stable precision screening; 
(4). Reduce the material stuck on screen mesh size;
(5). Reduce screening frequency.

The Introduction of rotary vibrating screen

► Introduction and working principle：Rotary vibrating screen is designed as a high-precision screening machinery. Round vibrating sieve is composed of vertical motor,and eccentric weight installed at two ends.We can produce horizontal, vertical, inclined motions by adjusting the upper and lower eccentric weight.Diameter can be ranged from 400mm to 2000mm, with single or multiple screening decks.

► Working Principle：

XZ Rotary Vibrating Screen is a vertical-motor system, with eccentric hammers being installed on top and bottom of the machine, where the motor acts as the vibratory source. The direction of the eccentric hammers may change its rotational mode either in horizontal, vertical and inclined movement onto the sieving screener surface. The trajectories of the materials on the sieving machine can be change by adjusting the phase angle on both top and bottom parts.

Running Track of Rotary Vibrating Screen

► Application :
    Powder rotary vibrating screen is widely used in many kind of industries
    Food industry: sugar, salt, alkali, glucose powder, monosodium glutamate, soy milk, yeast, wheat starch, wheat flour, rice flour, skimmed milk powder, fruit juice, dehydrated vegetables, thick, pineapple juice, soy sauce, corn starch.
    Chemical industry: pigment, medicine powder, oil, rubber, plastic, epoxy resin, PVC resin, polyethylene powder, vinyl chloride resin, aggregate grains,cosmetics.
    Ceramic industry: glass powder, refractory material, silica sand, spray soil particles, mud, grinding materials, nano brick materials, artificial graphite, kaolin, lime hydrate, mica, aluminum oxide, calcium carbonate Oxygen, diamond powder
    Metallurgy mining industry: lead oxide, zinc powder, aluminum powder, iron powder.
Pollution treatment: waste water, waste oil, pig dried urine, dyeing wastewater.
Other industries: carbon black, pearl powder, light calcium, additive, etc..

► Features
-Layers can be up to five layers
-Fully enclosed design,continuous operation,small volume and low noise
-Self-cleaning device(bouncing balls),avoiding blockage, mesh size can reach to 500 mesh ( 0.028 mm)
-High precision, high efficiency, powder, granule and mucus are applicable

► Advantage :

1. Low energy consumption, low noise, 
2. High screening accuracy, large capacity, simple structure. 
3. Fully enclosed structure, good sealing, prevent dust spillover, automatic discharge, more suitable for assembly line work. 
4. Screen body parts are used copper plate and section welded together (part group between body for bolt connection) overall stiffness is good, strong and reliable. 
5. Unique design of screen structure, convenient and quickly to change screen (only 3 to 5 minutes); And her mother screen fully supporting the fine screen, so fine screen can be long life, so as to reduce the consumables cost of the fine screen; In addition this design allows to using all kinds of screen (nylon, special dragon, PP network).  

► Selection condition :

To choose the most suitable machine for you ,please provide us more detail information as the followings:

1．Material: 

  -Material name:_____

  -Feeding size:_____mm

  -Material density:_____t/m3

  -Material distribution:_____%

  -Separation destination:_____

2．Screen machine

  -Capacity:_____t/h

  -Screen deck: _____ 

3．Particle size distribution of each layer:  

  -Opening size:_____mm

  -Construction material:_____

A lot customers only knows the micron term and don’t know the meaning of mesh when purchasing a rotary vibrating screen. In fact, the conversion of micron into mesh is simple. Let’s PK Machinery explain the specific conversion method. 

At first, let’s us briefly understand what is mesh definition. The mesh refers to the number of inches of screen holes per square. 50 holes per square inch refer to the 50 mesh. The bigger the number of mesh means the more holes per square inch. Besides, it also used to express the screen mesh particle size. The higher the number of mesh means the smaller the particle size. 

The powder particle size is known as particle size. The granularity means particles can pass through the screen mesh size with 1 inch (25.4 mm) the number of mesh width of the screen mesh representation is known as mesh. There is no unified standard size of powder technology in the world. Each enterprise has its granularity index definition and representation. Different country has different screen size. Hence, it is difficult to be standardized.

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. 

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 ℃.

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.