How to Prolong the Life Span of Circular Vibrating Screen?

Circular vibrating screen is widely used for building materials, chemical, food, abrasives, plastic, medicine, chemical fertilizer, metallurgy, glass, food, ceramics etc.

The following are the methods to prolong the life span of circular vibrating screen which might give you some ideas during the operation:

1.The bolts which connected with the body and screen box of circular vibrating screen are strength bolts. It cannot be replaced by using normal bolts to connect with the body and screen box. The fastening of bolts must be checked regularly, at least once a month. Loosen of bolts might occur if any bolt is loosen, which will cause damage to linear vibrating screen.

2. The space between side plates and mesh sieve box must be equal during replacing the woven mesh. First of all, tighten up the flat steel in the middle. At the same time tighten the mesh surface tension and ensure the surface tension is uniform and constant. Then, slightly tap the mesh surface tension along the entire length by using a hammer to check the tension. One of the reasons for woven mesh to damage in shorter period is due to the tension, either not enough or uneven.

3. The temperature of bearing should not exceed 75°C during normal operation. This is because there is a running-in process of new vibrator which might cause the higher temperature, but the temperature will be stable after running for 8 hours. Check the standard, oil level and purity of oil if the temperature remains high. 

Trommel Screen for Wooden Chip will Deliver to Thailand

After one month’s production, trommel screen ordered by Thailand is ready for delivery. The screen is used for wood chip processing and production line. According to the specification and requirement that client gives, our engineer suggest a shaftless type drum screen to meet the requirements.

Trommel screen is widely used in chemical, coal, construction, gold mine, plastic,quarry, recycling, metallurgy, mineral-selecting industries, etc. It can be sealed designed without dust pollution .PK Machinery offer both drum screen with and without shaft, we will suggest suitable one based on the technical data client offers.

Repair Method of Linear Vibrating Screen

The repair methods of linear vibrating screen mainly aim for the common failure, which include:
1. Rotation of vibration motor becomes slow, bearing heating, if this kind of problem appears, add the lubricating oil or grease to solve it.
2. Clogging of screen mesh, it may due to the increase of moisture content in sieve material, it may also due to loosen of both side screen mesh, the solution is to adjust the belt and shaft eccentricity distance.
3. Vibrating screen fails to start, you should check for the accumulation of dust and impurities on motor, and should be promptly removed.
4. Vibrating screen structure damages, such as beam fracture, side panel cracking. This situation needs to check the bolts, spring and eccentric block, then repair it.

 

Rotary Vibrating Screen was Delivered to Ukraine Last Week

Last week, rotary vibrating screen ordered by Ukraine client was finished production. The screen handles 40kg sodium bicarbonate per hour, our client also required to install a ultrasonic generator on the rotary vibrating screen to increase the capacity and screening efficiency, after finishing production, we had a test run and made a report to our client, he was quite satisfied with the performance and also wish to cooperate soon in the near future.

As we all know, rotary vibrating screen is designed as a high-precision screening machine for fine and superfine materials, if you have such problem, please feel free to contact us, we suppler customized order!

PK machinery supplies belt conveyor, bucket elevator, screw conveyor,scraper conveyor etc. for several years. Looking forward to future cooperation, we are glad to be your loyal friends!

What shall we do if YK circular vibrating screen bearing gets hot ?

The working principle of YK circular vibrating screen: it needs exciting force to drive the sieve surface, then it will generate a certain frequency and amplitude which makes the material screened on the sieve surface and get different sizes of material. But in the process of operation, the exciter rotating speed will slow down and the bearing will get hot, if you have such problem, please send the operator to stop the machine and inspect it immediately to ensure the normal operation of circular vibrating screen.

 

YK Circular vibrating screen exciter drives the symmetrical eccentric block structure rotates at a high speed, when the eccentric block falls off after working for a long time or eccentric block size gets inconsistent, it will lead to abnormal speed. So we need to replace the eccentric block timely to ensure same eccentric block sizes and balanceable running .When circular vibrating screen bearings rotate at an abnormal speed, it is easy to occur friction and temperature rise.
When YK circular vibrating screen bearing lacks of lubricating oil or the lubricating oil additive does not comply with the equipment requires ,the sealing device will get blocked, the temperature rising value will exceed specified range. So we need to inspect the equipment lubrication system to ensure it is clean enough, if there is blocking phenomenon, please take down the bearing and clean thoroughly. If sealing gasket gets broken or bearing gets worn, please replace sealing gasket and bearing timely, readjust the circular vibrating screen and start the screening operation .

Different Installation Methods and Characteristics of Linear Vibrating Screen Motor

Linear vibrating screen is 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. But what is the different characteristics of different motor installation methods?

1.Installation on the bottom
Vibrating motor installed on the bottom is not only safe and reliable but also will save a space. But the effective sieving area and the capacity will decrease if installed on the bottom, which would affect the screening efficiency and production progress.

 

2.Installation on both sides 
Motor installed on both sides can decrease the height of the linear vibrating screen. When there is a certain limitation from materials discharging outlet to the ground, you can adopt this of installation.

 

3.Installation on the top 
Vibrating motor installed on the top it is a best way to help customer effectively solve the problem if there is limitation to linear vibrating screen outlet height and width.
Customers can choose the vibrating motor installation method according to production requirements.

Notes of Ultrasonic Vibrating Screen before Using

Ultrasonic vibrating screen is a new sieving equipment compared with rotary vibrating screen, now PK Machinery will introduce the notes before using in details.

1.The input voltage of ultrasonic vibrating screen power supply is AC 220 V, ultrasonic power output is led by case back panel connection box, the red one is "+".When wiring, please pay attention to the voltage polarity, wrong wiring is not allowed.

2.In the condition of meeting the production requirements, lower power grade is better. Maximum current shouldn’t exceed 0.4.

3.When net rack is without load (the net rack is no tension), please do not start up the ultrasonic generator, otherwise it will cause overflow of power and damage of net rack and the oscillator.

4.Screen mesh must be tight, otherwise it will affect the ultrasonic output and the effect of vibration.

5.Oscillator aviation plug docking screws must be tightened and wrapped with insulating tape well, thus it will prevent dust .During operation, please pay attention to protect the connector.

6.Check whether the screw nut of oscillator and cable plug nut is tightened well or not before using, as well as the screw nut of oscillator and the net rack. In process of operation, pay attention to the protection of case and oscillator cables, cables and oscillator socket should be anti-moisture ,no water is allowed to enter in the connection plug and socket.

7.If the material is conductive, please extend the ultrasonic wire, stay the ultrasonic resonance power away from the screening site in order to prevent the material into the power case causing short-circuit.

8. When replace the screen mesh, scraping the residual gum of inner ring (resonance loop) with a sharp wallpaper knife, please do not grind by grinder wheel in order to prevent damage of resonance loop.

9.Each unit of ultrasonic generator includes a resonant power supply, an oscillator and a net rack. Please recognize each part clearly and don't mix with other ultrasonic generator.

What Shall We do to Solve Slow Material Discharging of Rotary Vibrating Screen ?

when we handle material in our daily life, we may encounter such situation : material discharging is slow. It may cause by the reasons as following aspects:
1. Check whether the screen mesh cloth and impurity removal is level or not, or if it is over height, normally it should be higher than about 5 mm, the discharging outlet design is different according to different material types.

2.During operation, check the screen mesh surface or if the discharging outlets are in the level, this has direct relation to the sieving effect. If it is not level, please adjust timely. Rotary vibrating screen is equipped with supporting foundation bolt before leaving factory, customers can adjust the rotary vibrating screen in the level and lower it properly by adjusting the foundation bolt.

3.Besides, the key point is to adjust vibration motor upper and lower eccentric block angle, smaller angle can make the material distribute and spread outwards fast, on the contrary, larger angle will make it slow .Adjustment of the eccentric block vibration motor angle should be around 5 degrees, if you have strict requirements on screening accuracy, the angle should not be too small, otherwise the material will spread outward quickly which is not good to the screening effect. Usually ,the angle of rotary vibrating screen motor upper and lower eccentric block angle is 45 ° before leaving factory.
 

The problem of vibration damping of vibration sieve

Damping vibration sieve, the key lies in the generator is fixed on the damping.

  Energy saving unit with built-in shock absorber is through with the seismic performance of the rubber shock absorber and steel chassis isolation, so unless the occasions with high requirements to be increased again in isolation device between the steel chassis and the foundation,  allow the steel frame and foundation for direct installation

    For a fixed set of non energy saving built-in shock absorbers must isolation device is additionally arranged between the steel frame and foundation for shock absorber.

     Vibration and noise of shock absorber installation can reduce the ground based, there are several different shock absorbers, The spring shock absorber damping effect is best, the isolation efficiency is up to 98%; glass fiber absorber efficiency is 75% ~ 85%;   Rubber shock absorber is 50% ~ 80%. For the geological and environmental special shockproof requirements, The foundation shall be arranged around the width of 25 ~ 30mm is arranged at the bottom of the isolation trench, base isolation layer, then the foundation bottom ramming, withcement,cinder,asphalt paving thickness of about 200mm, and then concrete is poured on the isolation layer.

  Generator shall anchor bolts with M18 diameter steel frame is fixed to the ground, to prevent movement.

    In addition, generating around the unit must set aside sufficient maintenance space, at the end of the outer periphery of cooling water tank, require the distance with the room wall of not less than 1.5m, the height from the top of the unit room roof height distance shall be not less than 1.5m,usually require a real high low voltage 4.5m, this is the minimum distance that must hold for ventilation and heat dissipation and maintenance unit lifting machine. The base station from the ground at least 150mm.

The technical precision screening enough do vibrating screen

1. Screen mesh plug (to increase the anti clogging device).

2. Cast material moisture into the vibrating screen is too large (viscosity, after appropriate input vibration after drying sieve).

3. The vibration sieve surface feeding uneven (add the material divider)

4. The vibration sieve surface material layer is too thick (increasing material divider, control the feeding amount)

5. Often to sieve sieve load and vibration reducing vibration cleaning gently

6. Change the screen box angle

7. Mediation of the vibration sieve feeding quantity

8. Tension screen, narrow transmission leather