Vibrating Screen: 七月 2015

2015年7月24日星期五

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.

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Henan Pingyuan Mining Machinery Co., Ltd is the most professional manufacturer of Belt conveyor, and Vibrating screen, Bucket elevator, Screw conveyor, Scraper conveyor using the world's most advanced technology, we are willing to serve every company to meet your custom needs. Our goal is "be the future global leader of mining machinery industry". If you have any question, please feel free to consult us (E-mail: info@pkmachinery.com) we will give you accurate and timely service.

2015年7月23日星期四

How to reduce noise during application and operation of rotary vibrating screen effectively(2)

This article is the continuation of previous one. PK Machinery will introduce you how to reduce noise during application of rotary vibrating screen continuously.

5.Rotary vibrating screen might locate at location that is nearby the other hard devices.

Solution: make sure the place nearby the rotary vibrating screen is clean to prevent the interference of the other equipment. Rotary vibrating screen should be placed at location which is 10 cm away from the other devices.

6. The screening body of rotary vibrating screen is uneven.
Solution: place the screening body steadily or add anchor bolts to fix.

7.The damage of vibration motor or exciter bearing of rotary vibrating screen will cause adverse effects.

Solution: replace the bearing or add lubricating oil regularly.

8. The looseness of other fasteners.
Solution: Check the fasteners regularly and tighten it if it is loosen.

The maintenance of components must be done regularly to solve the problems that occurred during the operation of rotary vibration screen equipment. The life span of rotary vibrating screen will be extended and increase the screening efficiency by solving those problems. Hence, it increases the economic benefits.

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2015年7月22日星期三

How to reduce noise during application of rotary vibrating screen effectively(1)

Rotary vibrating screen is a powder screening equipment with high accuracy. There are various noise might occur during the operation. The louder the noise will cause the greater damage to rotary vibrating screen, thus it is very important to find out the reasons of noise, analyze the reasons and find out the solutions to solve the problem effectively. The following are the reasons and effective solutions for noise occurs in rotary vibrating screen:

1.In order to fix rotary vibrating screenequipment during the process of transportation, the bolts will be added with the means of transport. However, the bolts that connected to rotary vibrating screen equipment might be left and causing noise during operation.

Solution: remove the bolts

2.The clamp bolts are not tighten.
Solution: check and tighten up the clamp bolts.

3.The clamp bolts are not completely jointed.
Solution: open and re-joint the clamp bolts, ensure the clamp bolts are jointed completely.

4.Due to the operation of rotary vibrating screen, the plate that is used for supporting the bouncing ball might be deviated from its place or it might be damaged.

Solution: re-locate the plate to its original place if it is deviated, or replace a new place if it is damaged.

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Henan Pingyuan Mining Machinery Co., Ltd is the most professional manufacturer of Belt conveyor, and Vibrating screen, Bucket elevator, Screw conveyor, Scraper conveyor using the world's most advanced technology, we are willing to serve every company to meet your custom needs. Our goal is "be the future global leader of mining machinery industry". Have any questions, please contact us without any hesitation.

2015年7月21日星期二

Suggestions for Reasonable and Effective Use of Rotary Vibration Screen

1. After complete installation of rotary vibrating screen, test run by putting in small amount of material, after confirmation of no creating any problem in installation and able to complete the screening, then it is ready used for formal production.

2. Screen mesh is one of the important components in the screening equipment. It plays the key role in screening efficiency and accuracy. Hence, inspect regularly for the tensioning or wearing on screen mesh, timely replace the screen mesh.

3. Rotary vibrating screen is relied on the vibrating motor as power source, thus vibrating motor is also very important, user should regularly add grease to the motor to avoid abrasion due to lacking of grease, and even burned.

4. Vibrating screen equipment will vibrate continuously during operation, so you should always check the loosening for some of the connection components in the equipment, such as clamp bolts, anchor bolts etc. Please check and tighten the components and parts of rotary vibrating screen regularly.

5. Rotary vibrating screen equipment will vibrate continuously during operation, thus do not place hard objects next to the equipment to avoid scratching or even lacerate the screen surface.

6. Vibrating screen uses bouncing ball, rubber strip and others rubber components, which can be damaged easily. The user should regularly check the damage of components, as damage will cause the leakage or mixing phenomenon during screening process, so please inspect and replace without delay.

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2015年7月18日星期六

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.

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Maintenance of Linear Vibrating Screen

Linear vibrating screen is one of the most commonly used vibration screen. Its maintenance and repair is essential, as good maintenance strategy and maintenance method can effectively prolong the lifespan of linear vibrating screen. So, let us take a look at the maintenance strategies and maintenance methods of linear vibrating screen.

The maintenance strategies of linear vibrating screen can be divided into three phases, before use, in use and after use.

Maintenance before use: linear vibrating screen should equip with electrical protection device; for initially use, anchor bolts should be checked each time before using in order to prevent loosening; check for damage on the screen mesh etc..

Maintenance in use: check the rotation of motor, if does not meet the requirement, adjust the power phase sequence; check unusual of the vibration; examine the stability of current.

Maintenance after use: periodically check the lubricate situation of machinery components, every two weeks operation, need to add the lubricating oil; after a total operation of one thousand five hundreds hours, check the wear of bearing; if long time do not use it, insulation resistance should be measured before use.

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The Installation and Maintenance of Vibrating Feeder

1. The vibrating feeder is used for dosing, quantitative feeding to ensure uniform and stable feeding and to prevent material flow automatically, the vibrating feeder should be horizontal installed; For general material continuous feeding, it can be installed down-dip 10; For viscous material or material with larger water content ,the vibrating feeder can be installed down-dip 15.

2. After installation, it should leave with 20 mm of interval for vibrating feeder, the suspension device adopts flexible connection.

3. Before test run, all bolts should be tighten up, especially the anchor bolt of vibration motor, it shall be retightened after continuously operation for 3 to 5 hours .

4. The two vibrating motors must rotate in reverse during test run, if there is any abnormal phenomenon, please stop immediately and solve the problem.

5. During operating, the amplitude, current of vibration motor and surface temperature of motor should be regularly checked . The front and back amplitude must be uniform and no side shaking, the current of vibrating motor should be stable, if there is any abnormal phenomenon, please stop immediately and solve the problem.

6. The lubrication of vibration motor bearing is the key point for the normal operation of the whole feeding machine. The second-rate molybdenum 2 # grease should be refilled periodically on the bearing, normally fill the grease every two months, and fill once a month during the high temperature season. The motor should be repaired every six months to change the internal bearing.

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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 .

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The Effective Way to Install the Screen Mesh of Linear Vibrating Screen

A. Please pay attention to the coarser mesh size, because the installation of the linear vibrating screen mesh is relatively complicated.

B. When cutting the mesh, keep the screen width and rack width the same, the length must be 50-70 mm longer than net rack.

C. When installing the mesh, please tight the screen mesh, because screen mesh tightness is one of the important factors that affects the screening efficiency.

D. When add the bouncing balls, it is important to check the screening difficulty of materials, please don’t add bouncing balls without consideration.

E. If material density or mesh size is superfine, you should install an extra screen mesh with a suitable size under the screen mesh, its purpose is to support the upper screen mesh, and reduce the material pressure to screen mesh and prolong the service life.

F. After finishing installing the net rack on the screen box as per requirement, do remember to put the extra screen mesh into the corresponding discharging outlet to avoid material mixing phenomenon.

G. After whole installation finishes, you should test run with few materials to check the material distribution and screening efficiency. If material moves forward evenly and classify accurately, no material mixing phenomenon, then the machine can be put into use. On the other contrary, if there is material off tracking, accumulation or uneven phenomenon, you should adjust the screen surface roughness and uniformity. If there is material mixing phenomenon, you should check whether screen mesh sealing is tight nor not, but if there is uneven material conveying or material mixing phenomenon, you should adjust the linear vibrating screen correspondingly。

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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.

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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.

ultrasonic-vibrating-screen manufacturer

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What is the Impact of Uneven Rotary Vibrating Screen Material Feeding?

Rotary vibrating screen is widely used in food, chemical, metal and other industries. But some users may ignore rotary vibrating screen uneven feeding problems in the process of screening. Here PK Machinery will introduce the serious impact brought by uneven material feeding.

1.Low screening efficiency

During operation, material feeding is not even can greatly reduce the screening efficiency, if feeding load exceeds the screen can withstand, the material will have no enough time to be screened and will discharge directly from outlet, thus superfluous fine material will discharge from coarse material discharging outlet which will greatly reduce the sieving efficiency.

2.Reducing the service life of screen mesh cloth

During operation, material feeding is not even or feeding load exceeds the screen can withstand, screen mesh cloth will damage quickly due to the serious stress.

3.Reducing the service life of the vibration motor

During operation, material feeding is not even or feeding load exceeds the screen can withstand, it will dramatically increase the load of vibrating motor which will cause motor damage and reduce the service life of the machine.

rotary vibrating screen material feeding

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How to Solve the Problem of Rotary Vibrating Screen Fails to Start-up?

As a fine screening equipment, rotary vibrating screen wins a high praise from customers. Rotary vibrating screen may fail to run properly due to various reasons in use process which will bring lots of inconvenience. Here PK Machinery will analyze the reasons:

1. First you need to confirm with the customer the correct voltage and frequency with three-phase power supply.
2. If the motor is damaged, you need to replace the motor.
3. If the control circuit of electrical components is damage, you need to replace the electrical components.
4. If voltage is insufficient, you can solve it by changing the power supply.
5. If there is too much material accumulated on the screen surface, you need to clear the materials on screen surface.
6. If vibrating motor breaks down, you can troubleshoot by inspecting the motor.
7. If grease inside the motor get thick lumped, you need to clean the motor then add proper grease.

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What Proper Rotary Vibrating Screen Phase Angle Can Reach Best Screening Efficiency?

Rotary vibrating screen adopts counter weight mounted on the upper and lower motor shaft end, driving the motor rotation movement into horizontal, vertical, inclined three dimensional movement, then transfer the movement to the screen mesh surface. Different phase angles result to different screening effect. Customers also can adjust the proper phase angle according to the needs, but what shall we do to adjust the proper phase angle to meet our needs?

1. Phase angle of 0 degree: material moves from the center line and flows to the circumferential direction in straight line. This is mainly used for coarse screening

2. Phase angle of 15 degrees : the material begins to do swirling motion. This is mainly used for common screening.

3. Phase angle of 45 degrees: materials move as the longest swirling motion. This is mainly used for screening of precision material, high cohesion materials and material with large moisture content.

4. Phase angle above 90 degrees: materials move together to the center. This is mainly used for special screening purposes.

Normally the phase angle is 45 degrees before leaving factory, customers can adjust the angle according to the need.

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How to Solve Rotary Vibrating Screen Clamp Gets Hot and Current Rises Problems?

Rotary vibrating screen model:XZS-1500-3
Screening material: calcium carbonate
Mesh size: mesh#100, mesh#200 and mesh#325.

Customer: The stainless clamps is very hot. Especially in the screen mesh 325. We were forced to stop the operation. What can you suggest we will do?

PK Machinery: You said the stainless clamps is very hot, normally it is caused by bolt looseness of clamp, please tighten the bolt of the clamp.

Customer: When it is loaded with the material for screening, the current will rise from 7.5amperes to 15 amperes. It even rises to 30 amperes and the circuit breaker of 15 amp broke. How much current reading is the normal operation?

PK Machinery: Please check whether the power wires and grounding wires are well connected or not .

Concerning the current rising, normally, current rises when the machine starts to run for seconds, it will become normal later soon.

Customer: We tried to work on the machine. Tighten the clamps, and check on the wires. Its is doing well. Thanks very much!

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