Application and Difference of Shaft and Shaftless Trommel Screen

There are 2 kinds structure of trommel screen. One is trommel screen with shaft, the other is shaftless trommel screen. Generally both of them can be applied in some common bulk material, however, for material with special property, we must pay more attention to select a more suitable model according to the application working condition.
Trommel screen with shaft: 
The drum is installed aslope on the main frame. The motor and gearbox connect the drum through a coupling and rotates around an axis. After the material fed into the drum, the material can move forward and rotate due to the inclination and rotation of drum. The qualified material will be discharged from the bottom hopper, and the unqualified material will be discharged from the end outlet. As the material rotates in the drum, which make the blocked material bounced out of the aperture to prevent the mesh blocking.
Trommel screen with shaft is generally used for screening granular material with large density, such as: sand, coal, limestone, fertilizer, compost and mineral, etc.

 

Shaftless trommel screen: 
The shaftless trommel screen is installed horizontally. The drum is rotated driven by motor wheel gear or motor chain. Generally the rotate speed is very slow and the drum length can be designed longer, which can increase the screening efficiency. In the drum internal wall, there is a delivery plate ( sometimes screw type) to make the material move forward. The material which is larger than mesh size will be discharged at the end outlet, and the material which is smaller than mesh size will be discharged at the bottom discharge hopper. If the material is household garbage, we can also add a cutting tool, which can rive some plactis bags, etc. 
Shaftless tromme screen is generally used for screeninig material with small density, such as: waste, wooden chips, activated carbon, fertilizer, construction material, chemical material, etc.  

Do not Ignore the Unbalance Motor Vibration Phenomenon of Vibration Table!

Do not Ignore the Unbalance Motor Vibration Phenomenon of Vibration Table!

Vibration motor is not as what you imagine, only plus a few springs on the equipment, and put on a few motors, it will become a veritable vibration equipment, then will be used for vibration production? In fact, sometimes the question is much more serious than the imagination, the theory and practice is the only way which can reach truth. Next Henan Pingyuan Mining Machinery Co., Ltd will explain to you: The unbalance vibration phenomenon of the vibration motor for vibration table.

The problem of vibration which cannot meet the vibration motor in the running of the equipment, also can never be solved, that is uneven and unbalance of the vibration. The influence of the unbalanced vibration in the screening equipment is less, while the influence will often appear in making the vibration table. However in the reality, the unbalanced force of vibration equipment is often neglected by us.
1. In the use of a single vibration motor on the vibration table, it can appear the problem of motor rotation, the material will move on the surface of vibration table.
2. In the use two vibrating motors, it will change the uniform vibration point of the vibration table. Due to counter rotation of two motors , it will offset the power in the middle of the vibration table. If the vibration amplitude around the platform is 5mm, the vibration amplitude in the center of the table can't be over 3mm. 

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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.

How to Prolong the Lifespan of Vibration Motor

1. Make sure the wiring and insulation work of vibration motor is well done in order to prevent the lack of phase and short circuit .

2. Anchor bolt reinforcement work should be done frequently, take necessary prevention measures, such as using a double nut fastening to ensure vibration motor base and the floor contact well.

3. Attach great importance to the cover sealing of vibration motor, the dust inside the protection cover should be cleaned up frequently.

4. Strengthen the daily maintenance of vibration motor, remove the dust on the motor surface frequently, and reduce the impact on the vibrating motor due to the poor heat dissipation in order to make it work in a good condition.

 

5. Please pay attention to the symmetry when adjusting the vibration block, the gravity connection center line of vibration block on both sides should be parallel to axis.

6. Check whether there is crack on motor appearance, all fastening screws and parts are complete and the fixed situation of the motor are in good condition or not.

7. Check whether the ventilation and bearing lubrication condition of vibration motor is normal or not.

8. Pull out the motor axis and check if rotor can rotate freely and whether there is noise during rotation.

9. Check whether the grounding device is reliable or not. 

 

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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. 

Please do not hesitate to contact us if you have any inquiries about our company or products. We are ready to serve you better. 

Address: 289 Yellow River Road, Xinxiang City, Henan Province, China. 

Tel: +86 373 579 9198

Fax: +86 373 507 1699

Email Address: info@pkmachinery.com

Official Website: http://www.pkmachinery.com/