Merry Christmas and Happy New Year

New Year is coming soon, here PK Machinery wishes everyone a happy new year.
New year is approaching, in order to appreciate the trust and support of customers, many shopping malls launch a variety of promotions, for example, super big sale, discounts and other promotions. Of course, not only daily commodities have such promotions, in our PK Machinery also has such activities. Promotional activities are as follows:
1.In accordance with different configurations, we can quote our customers best discount based on the original price as to vibrating screen and conveying equipment.
2.We will provide free site planning and design for customers in need.
In order to thank the support of our customers, Henan Pingyuan Mining Machinery Co., Ltd puts forward a favourable activity, not exaggerate, not cheating. And we just want to give a gift to our customers in the New Year.
Henan Pingyuan Mining Machinery Co., Ltd wish you happy Christmas. 

How to solve inflexible rotation problem of conveyor roller?

To ensure accuracy during conveyor roller manufacturing process 
Such as the inner hole precision of punch bearing housing should reach grade 3, dimensional tolerance,coaxial degree and ovality of the pipe body two ends must conform to the national standard,can not exceed the tolerance.
Sealing and lubrication
in addition to ensure the quality of manufacture, also require better lubrication materials, such as lithium base grease which can improve the bearing lubrication performance, this is very necessary to prolong the service life of roller.
Bearing seat adopts labyrinth seal structure of centripetal ball bearing supporting and plastic sealing ring, which can guarantee reasonable bearing stress of roller during operation,but also ensure good dust prevention effect, small resistance, and convenient installation and easy maintenance, it can effectively reduce the conveyor operation cost at the same time. 

Xiaohe Training Courses were Held in PK Machinery

Those days, many companies including PK Machinery have attended training courses which sponsored by Xiaohe Training. Aiming at improving the working ability of staff and promoting the development of foreign trade team even increasing business performance of foreign trade department, we actively participate in this training courses.
This training courses will last one month. Ant it contains many very useful lessons, such as SEO, Google Adwords, Youtube markting and others. Not only the lecturers are very enthusiastic and responsible for the class, but also the learners are very hardworking and attaching importance to this training courses. Every day we have finished our lessons in the daytime, we all review the knowledge what we have learned at night. Devoting so much energy to the courses, we all believe PK Machinerywill achieve great success in the near future. 

Operation and Maintenance of YA Circular Vibrating Screen

1.Before starting up circular vibrating screen, please check whether the fastening bolts are loose or not, if there is looseness,please tighten at once.
2.Non-load running for 4 to 6 hours to achieve the requirements of smooth screen body , no yaw and abnormal sound , the vibrator bearing temperature is less than or equal to 75℃.
3.After non-load running, please tighten the screw bolt again.
4.Once the operation becomes normal, check the fixture condition of the fastening bolts regularly.
5.Check the wearing parts frequently, the damping spring which is damaged spring or without elasticity,please replace timely. If the screen occurs fracture or wear, please tighten or replace the spring at once. The adjustment,use and maintenance of vibration source, please refer to vibration source instructions. (please oil the vibration motor after using for 3 months, oil the exciter every month, repair every half year, overhaul every year).
6.Stop feeding the material before stopping running the machine, stop the machine after the material on screen surface are completely discharged. 

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.

The advantages and Principles of Vibratory Feeders

Vibratory feeders(as known as vibrating feeders,vibration feeders) is suitable for metal and coal feeding system. The materials will be discharged evenly onto the belt conveyor from bunker by using vibratory feeders and will form into a appropriate thickness and width of material layer. Applicable materials can be coal, ore, sandstone, sandy soil and other powder raw materials in food and chemical plant.

Working principle:

The feeding process of vibratory feeders is achieved by the feeding chute doing linear reciprocating vibration periodically which is forced by the special vibrating motor. When the vertical weight of the feeding chute vibration accelerated speed is bigger than the gravitational acceleration, the material will be upthrown and jumped forward along a parabolic path. The feeding chute will vibrate and the material inside the feeding chute will jump forward continuously due to the continuous exciting of the vibrating motor, so that it can achieve the purpose of material feeding. 

The characteristics of the vibratory feeders mainly include the following parts:

1. It can easily control the discharge capacity. You can also control the discharge capacity (tons/hour) by using a inverter.
2. It applies to a wide range of materials, such as powder, granule, block and other materials.
3. Low maintenance cost , because of adopting resonance principle, so the vibration feeder has less power consumption and less wear characteristics.
4. It can be used in special conditions: according to different working condition, the vibrating feeder can be equipped with dust cover, liner plate, sealing part etc.
5. Smooth vibration and reliable operation.
6. Special grid design which can prevent material blockage. The clearance between grids can be adjustable.
7.Frequency conversion motor is optional, you can change the capacity by adjusting the motor frequency which is easy to control the feeding rate without starting motor frequently.

Site Application of Trommel Screen and Inclined Belt Conveyors

Trommel screen and inclined belt conveyors is widely used in conveying and screening industry.They are specifically for processing bulk materials such as coal, construction material, stone, sand, compost, woodchip, soil and related products.

In real manufacturing process, trommel screen and inclined belt conveyors are the most important parts in the production line. At the same time , it is in response to customer demand for handling larger volumes. Also, as modern production system, it can not only save energy and optimize throughput requirements, but also improve the efficiency of production and provide suitable solutions across a wide range of sectors for our customers. It is also another option to our customers to save more costs.

We have been in manufacturing belt conveyor, vibrating screen, bucket elevator, screw conveyor, scraper conveyorfor many years. With the development of our company, we will manufacture higher quality products to meet our customers’ requirements better.

Structures and Features for Three types of Rotary Vibrating Screen Net Rack

Rotary vibrating screen is designed as a high-precision screening machine it is widely used for sugar, salt, wheat flour, rice flour, pigment, medicine powder, ceramic, silica sand, metallurgy zinc powder, aluminum powder, iron powder, calcium powder etc.

The net rack is the important component of rotary vibrating screen, here we will introduce the structures and features of three common net racks for rotary vibrating screen.

1.U-shaped net rack 
It belongs to the very commonly used model of rotary vibrating screen, first use the pressurized tooling to fix the thick wire diameter of screen mesh in the U-shaped groove, this layer is called meshed net, then the working net is tiled above the meshed net and clamped it. The advantage of this type of net rack is the replacement of working net in a faster rate, the framework of meshed net supports the working net to ensure the flatness of screen surface and prevent the impulsive force of material causing damage of working net, at the same time also will avoid the damage of working net due to the strike of bouncing ball that on the screen plate. The only disadvantage of this type of net rack is the overlapping part of meshed net and working net, which will influence the screen area.

 

2.Snap fastener net rack 
Rotary vibrating screen has two flanges: convex and concave. The concave flange is welded inside the screen frame, while the convex flange is a movable component, the screen mesh is placed between two flanges and locked up with the screw, the screen surface will tension naturally. Generally, this net rack structure is designed for the screen mesh with 12 mesh-30 mesh.

3.Dual A net rack
It also known as the single net with dual clamp net rack or light weight net rack structure. Rotary vibrating screenwith this net rack is using two ring shaped circular hoop fix tension screen mesh. The main advantage of this type net rack is higher screening rate. 

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. 

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.

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.

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.