Vibratory Feeder and Portable Belt Conveyor Have Been Delivered

On August 19th, 2015, trommel screen, belt conveyors, vibratory feeder, hopper and gate valve ordered by Kazakhstan client and DY5012 portable belt conveyor ordered by Philippines client have been delivered from our company.

 

On August 26th, 2015, machines oredred by Kazakhstan client will be delivered to Astana, Kazakhstan from port of Xi’an by railway. And as a production line, trommel screen, belt conveyors, vibratory feeder and hopper are mainly used to screen and convey sand.

 

On August 23th, 2015, DY5012 portable belt conveyor ordered by Philippines client will be delivered to Cebu from Qindao port. Our customer has ordered two portable belt conveyors, two spare belts and some spare rollers. And this belt conveyor is used to convey packed bag that weighs 50kg. Due to move easily, it can improve conveying efficiency better. At the same time, our client speaks highly of our service.
PK Machinery is devoted to provide better products and service to our customer. So welcome to your enquiry! 

Troubleshooting for Gyratory Screen

As one of our main product, gyratory screen has been supplied to many plants all over the world and also enjoys a good reputation because of its superior design and quality. Gyratory screen is widely applicable to chemical, food processing, refractory materials, building materials, activated carbon, food, PVC powder and other fine materials.
However, during the operation, we may meet some problems, here PK Machinery will introduce the breakdown reason and method in detail.
 

 

 

Breakdown	Reason	Solution
V-belt heating up	V-belt looseness Through of belt is broken or the surface is rough	Loose the bolt which fastens the motor, adjust the distance between motor and belt pulley Check and repair the belt pulley
Bearing heating up	The grease is excessive or shortage or the quality is bad Bearing is broken Main shaft bends or the inertial force is not balanced The bearing cup is not compatible with other parts Belt is too tight Overload working for a long time	Change the grease Change bearing Correct the main shaft Change the part which coordinate with the bearing Adjust the tightness of the V-belt Reduce the feeding rate
There is no force for motor	Two phase electricity Circle short for the winding Overload working for a long time	Power on the lost phase electricity to ensure it runs under 3 phases Inspect the motor Keep the screen working under the rated load
Fail to start the motor	Low voltage Electrical wiring is too thin Fuse is broken	Start the screen once electricity is normal Change the electrical wiring Change a proper fuse
Violent or wiggly vibration	The rotation shaft bends Bearing is broken	Replace or correct the shaft Replace the bearing
The unqualified size material mixed in the finished material	Screen mesh is broken Screen cover or seal bar is loose	Renew the screen mesh Press the cover and seal bar
Capacity declining	The moisture is too high, block the mesh The opening size is not suitable Rotation speed is low or the V-belt is loose Feeding rate is low The rubber ball is worn out	Reduce the moisture of material Renew the screen mesh Check the belt pulley and the tightness of belt Increase the feeding rate Renew the feeding rate

Test Running Note of Scraper Conveyors (I)

PK Machinery offers horizontal scraper conveyors and inclined scraper conveyors, the angle can range from 0 degree to 90 degrees. Scraper conveyors are widely used for transporting cement , coal, metallurgy, mining, construction material, chemical, grain etc. There are two stages of test running : no-load and load test running. Here PK Machinery will introduce it in details:

Non-load test running

1.Check if there is any remaining tool, iron casting pieces and other hard objects inside the scraper conveyor, if any , please clear up. 

2.Give enough lubrication to all the bearings, driving devices and drive chain etc. 

3.Check if all the scraper conveyor parts are intact, whether the tense of scrapers is suitable or not. 

4.After finish checking the above items, then power on and switch off several times to see if the operation is normal, if normal, run the scraper conveyor continuously.

5. In addition, the head, tail , medium parts and other main structures, workers must be sent to observe the running , if any problems, please solve it without delay.

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What should We Note during the Operation of Gyratory Screen

Gyratory screen is similar to rotex screener, it is designed with gyratory motion which can obvious improves the distribution of the material. Applicable material includes urea, potash, fertilizer, activated carbon, pellet, ceramic powder, sugar, salt, starch and fireproofing material etc. Here PK Machinery will introduce necessary notes before starting up the screen.

 

1. Check the fastened part, safe protection device and lubrication before start-up.
2. Test run without load first for about 3-5mins to see if the rotation direction meets the requirement.
3. Feeding material with normal operation once non-load test run is normal,
4. Check the material discharging condition during running, if any blockage is found, please solve it timely.
5. Check the material distribution on screen mesh is uniform or not, if necessary, stop machine and adjust.
6. If there is abnormal noise or vibration that you have to stop the gyratory screen, please stop machine at once, only when the trouble is eliminated, then you can start up.
7. If gyratory screen is operated in a production line together with other equipment, please start up downstream equipment, then start up the upstream equipment.

Common Material Discharging Ways of Bucket Elevators

PK Machinery mainly offers bucket elevators with belt type,ring chain type and plate chain type which is mainly suitable for feed mills, flour mills, rice mills, oil, starch factory, grain depot, port terminals and other bulk materials conveying industry.

 

According to different discharging ways, bucket elevators also can be divided into: centrifugal type bucket elevator, gravity type bucket elevator and hybrid type bucket elevator. The introduction is described as follows:

1. Centrifugal type: it is using centrifugal force to throw the material away from discharging outlet which is applicable to the material that is dry with fast lifting speed and small particle.
2. Gravity type: under the effect of gravity, the material will discharge along the bucket back , it is suitable for material which is large and fragile.
3. Hybrid type: centrifugal force and gravity force , which is suitable for material with poor fluidity and big humidity .

How to Select the Suitable Belt for TD Belt Bucket Elevators

TD belt bucket elevator uses belt as its traction, there are pitches between buckets, normally ,the buckets will be fixed with belt by bolts. General used belts include: ordinary rubber belt, nylon rubber belt and steel cord rubber belt. Here PK Machinery will introduce how to select the suitable rubber belt :

Ordinary rubber belt adopts cotton as its core, then molded after being coated with rubber vulcanization,. Usually, the ordinary rubber belt is used for bucket elevator with small lifting height.

Nylon rubber belt adopts nylon canvas as its core,then molded after coated with rubber vulcanization, it is usually used for TD belt bucket elevator with the height that is relatively big.

Steel cord rubber belt is made of steel rope as its core and molded after being coated with rubber vulcanization. The strength of steel cord rubber belt can meet the requirement of high rise and large capacity development . In recent years, the demand of hundred meters’ lifting height and high efficiency bucket elevator is increasing day by day, the steel cord rubber belt bucket elevator would be a good choice.

 

Blocking Fault Analysis of Screw Conveyor

Since screw conveyor conveying space is small and it is sensitive to material, intertwining phenomenon is easy to occur when screw shaft rotates, blockage occurs in the place of hanging bearing. So blocking problem is the most common fault of screw conveyor which will affect production and increase power consumption, even the motor will burn out and screw shaft twist off which will affect the normal production. Blocking problem is caused by many reasons, we can take measures to avoid this problems:

 

1. Select reasonable screw conveyor technical parameters, for example, if using low speed screw conveyor the rotating speed can not be too fast.
2. Carry out the operation procedures strictly, non-load start-up and stop to ensure continuous evenly material feeding. 
3. Increase the outlet or extend the chute end dimension to solve the problem of unsmooth discharging or can not discharge material timely .At the same time, you can also install a section of reversed screw blade to avoid blocking. 
4. Clean up the material inside the screw conveyor in order to prevent big impurity or fibrous material enter into thescrew conveyor and occurs blocking.

 

5. Reduce the transverse dimensions of intermediate bearing as much as possible in order to reduce the possibility of material passing through the intermediate bearing.
6. Install a level sensor and blockage sensor which can achieve the purpose of automatic control and alarm. 

Maintenance Method of Portable Belt Conveyor in winter

In winter, portable belt conveyor will work in the outdoor and suffer from rain and snow, in this way, what shall we do to maintain portable belt conveyor to achieve the purpose of long-term steady operation?

1. Maintenance of motor
Concerning the operation process of portable belt conveyor in winter, motor will be the main part we should protect. Although motor damage rate is very low, if motor overloads it will still damage. As we all know, temperature is pretty low in winter, motor lubrication condition is not very good. Therefore, the motor of portable belt conveyor should be checked and maintained regularly .

 

2. Overall antirust processing for the whole machine
Though before leaving factory, portable belt conveyor was already painted again and again, after checking, we found that most of the conveyors are still rusty. This is not the problem of painting, but is the maintenance service of equipment. Especially during winter season, there is lots of rain and snow. In many cases, portable belt conveyors are not properly covered in raining and snowing environment . So in the long run, even using the best painting and steel ,the service life of portable belt conveyor will still reduce. 
In conclusion, the suggestion is to make the conveyor covered and keep the conveyor away from rain and snow to extend the service life.

 

3. Maintenance and replacement of spare parts
Conveyor roller is the most used spare parts of portable belt conveyor, so we need to check the wear condition and bearing using condition of roller frequently. Concerning the damaged roller, you should replace timely.
For conveyor belt, please clear up the belt surface and the accumulated impurities timely in order to avoid long time abrasion.

What is the Impact on Adjusting Vibration Motors Inclined Angle of Linear Vibrating Screen

Linear vibrating screen utilizes vibration motors as vibration power driving the material jump up on screen mesh and do linear movement. Besides, concerning the materials like crushed stone and sintered ore which are difficult to sieve, you can change the material residence time by adjusting the inclination angle of vibration motors according to the production requirements to achieve the purpose of higher screening performance, however, what should we do to adjust the vibration motors according to the needs? Today PK Machinery will introduce the impact on adjusting the motors inclined angle of linear vibrating screen:

1.When the vibration motors’s inclined angle is increased 
the horizontal stress of the materials on the screen will be decreased, the forward speed of the material will be decreased , the exciting force on the screen will be decreased, and all of these conditions will result in low screening efficiency and affect the screening effect. 

2.When the vibration motors’s inclined angle is decreased
The horizontal stress of the materials on the screen will be increased, the forward speed of the material will be increased as well . Although this can achieve in high screening efficiency, but it cannot achieve in good screening effect.

After few times of research work and lab testing by PK machinery’s engineer, the most efficient inclination angle of the vibration motors is at angle of 45 degrees which can make the vibration motors work in best performance by giving out high screening effect and efficiency.

Vibrating Feeder Used for Wooden Chip is Ready for Delivery to Thailand

On 5th August, vibrating feeder ordered by Thailand client will be delivered to Qingdao port. This is a repeat order from our client which is used for feeding. The vibrating feeder is dealing with 13 tons per hour wooden chip, our engineer selected a seated type with a sealed cover to meet the requirement.

The seated type of vibrating feeder is composed of feeding trough body, exciter, spring support and driving device. It is utilizing the centrifugal force produced by the rotation of eccentric block driving the feeding trough body and exciter doing continuous circular or similar like circular movement, which makes material flows continuously to achieve the purpose of feeding.

Established in 1960,PK Machinery has enjoyed more than 50 steady years of successful growth to become an international company in manufacturing screening, elevating ,feeding and conveying equipment ,with abundant engineering design experience, professional technical ability and strict fabricating specification, PK machinery wins the highly praise from clients all over the world, any inquiry please feel free to contact us, we will spare every effort to offer warm-hearted service to you ! 

Application Analysis of Calcium Carbonate Rotary Vibrating Screen

The sealing performance of calcium carbonate rotary vibrating screen is pretty good, non-blocking design and precise screening. Besides, you can also choose ultrasonic vibrating screen instead of common rotary vibrating screen in order to achieve more accurate screening performance, the screening accuracy even can reach 500 mesh.

 In the process of production of calcium carbonate, it mainly includes light calcium carbonate and heavy calcium carbonate, the production process of two kinds of calcium carbonate is the same during crushing and screening. When screening the calcium carbonate, the output rate is designed according to manufacturing production rate per hour, the screening amount is calculated as per the material amount after crushing, the general selection of material granularity is around 100 mesh and the main selection specification is 60 mesh, 80 mesh and 120 mesh etc. In addition, the mesh size is also selected according to the needs of users. In the process of screening, rotary vibrating screen is the best screening equipment, the screen mesh can be replaced with the previous required mesh size in order to achieve the screening requirements.