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.

Common Failure Diagnosis and Troubleshooting of Motorized Pulley(2)

This article will introduce common failure diagnosis and troubleshooting of motorized pulley to you continuously.

5.Oil leakage of junction box (internal driver). 
Troubleshooting method: Check whether the oil level is too high or not. Remove the junction box and tighten the grease seal plug.

6. Big pulley noise.
Troubleshooting method: If noise of newly installed pulley is big, please increase the support rigidity and check the pulley, shaft coupling, motor installation coaxality simultaneously. The method is to remove the pulley from the stand, test run the pulley separately. If the noise becomes smaller, it indicates that the support rigidity needs to be increased.

7.Pulley doesn’t rotate after the backstop pulley is connected to the power supply. 
Troubleshooting method: Power supply sequences have errors, the power supply should be disconnected immediately and change the sequences of power supply in order to get the correct sequences of connection.

8. Pulley is reversed when the backstop pulley is disconnected to the power supply. 
Troubleshooting method: Check if backstop device is fault or wear and tear.

 

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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.

Common Failure Diagnosis and Troubleshooting of Motorized Pulley(1)

The motorized pulley should be checked regularly and eliminated trouble timely. The common failure and troubleshooting of motorized pulley will be introduced as shown as below:

1.The current of motor is low, and the cylindrical body doesn’t rotate.
Troubleshooting method: Motor should be checked regularly to know whether it is normal or not. If motor is normal, it indicates that there might be broken in coupling pin shaft ,after changing the coupling pin shaft and start the machine to prevent the more severe consequences.

2.Oil leakage in pulley ends and coupling rotating parts. 
Troubleshooting method: Tighten the spring coil or replace the grease seal.

3.Oil leakage in end cover. 
Troubleshooting method: Tighten the oil plug and change to grease resistant rubber gasket.

4.Oil leakage in the connection parts of cover and cylinder body. 
Troubleshooting method: Check whether the connecting bolts are loosen or not and check if the ventilation plug and air outlet are blocked, unclogging it or clean it if it is blocked.

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.

 

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.

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.

Two-way Pull Cord Switch of Belt Conveyor Protection Devices

The two-way cord switch adopts the world’s leading dual bearing transmission structure in order to avoid the friction exists on drive shaft directly when the s pull cord switch is switched on, causing the increasing gap, improper seal or stuck phenomenon, which will prolong the life-span of pull cord switch. Precise painting applied on the surface of two-way pull cord switch of belt conveyor protection devices which is not easily to fall off. The driving shaft is made of stainless steel material with high intensity, the surface of shaft is smooth. The lever is made precisely to avoid the welding. Besides, the bronze cushion is built internally which makes smooth surface of lever and higher intensity. This product has several advantages, which are longer life-span, flexible, practical ,safe and reliable operation, easier maintenance and so on.

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!

The Reasons for Bucket Elevator Head and Tail Wheel Wears Seriously

1.Serious wear problem is caused by the lack of lubricating oil in head to tail wheel, lubricating oil is used to reduce the effect of friction between the components, the working load of bucket elevator is focused on the two wheels, if lacks of lubricating oil, the friction will become greater, the hole that connect sprocket and main axis will be worn seriously, the head wheel and tail wheel will work in unstable condition, the lifted material will also fall down, so the head wheel and tail wheel must be well lubricated.

2. Material particles that conveyed by the bucket elevator is relatively large, the hardness is relatively higher, there will be few materials falling off from equipment during operation, since the sprocket is bigger, the material is very easy to hit the head wheel and tail wheel, after a long period of time the wheels will be deformed, so the material size of conveying material must match with selected bucket elevator. 

3. Unsuitable construction material selection of tail wheel and head wheel, processing quality is not qualified, it is sure to have some troubles when use it, in addition, the strength for head wheel and tail wheel of the bucket elevator to bear is very large, low quality will surely has serious wear and tear with faster rate, so we must accurately calculate the pressure of sprockets to bear when the choosing head wheel and tail wheel and select appropriate metal material for processing technology to produce durable sprockets.

Features and Notes of Steel Cord Belt Bucket Elevators (2)

This article is the continuation of previous one which is more knowledge about features and notes of steel cord belt bucket elevators.

4. Middle casing: The design for casing is optimized with double channel in order to prevent the eddy current interference which caused by the belt with relatively high speed, and strengthening angle steel attached to middle casing. The casing of elevator should be checked regularly in order to examine if there is abnormal noise, and frayed or damaged.

 

5. Lower part device: Gear and rack tensioning devices have been used to adjust the tension synchronously. The tail pulley is designed with automatic centering device and attached with an anti-belt-deviation device and instrument that control the level of material. The step for checking the device must be done in order to examine the base of steel cord belt bucket elevator, to check whether it is damage, crack and whether the bolts are loosen or not.

6. Protection device: There are anti-belt-deviation in head and tail section of the main device. The signal will be sent to the control room when the belt deviation occur, and hence the power supply for the main device can be cut off immediately. There are material level control instrument and rotary switch at the tail section of steel cord belt bucket elevator. All the inspection exits must be check whether it is closed and sealed properly.

Features and Notes of Steel Cord Belt Bucket Elevators(1)

1. Operation component: Special structure design that has been used in this part includes the high intensity tear-resistant steel cord belt with a customized belt joint and bucket fastener which enables the longer lasting of steel cord belt, the design and layout of bucket are reasonable with different arrangement to ensure the materials can loading and unloading continuously. The steel cord belt bucket elevator should be checked regularly to prevent abnormal noise or vibration.

 

2. Operation parts: The decelerator with hard tooth surface orthogonal shaft connected directly with the elevator shaft, with the help of hydraulic coupling to overhaul the machine and non-return device, structure of transmission device is compact which can achieve the flexible starting. The inspection must be done regularly to check whether the discharging of material flow of chute is normal, accumulated or blockage or not, and check whether the pressure in bucket elevators are negative or not.

 

3. Upper part device: The pulley is designed with automatic centering device. The material used for pulley is rubber capsule with high performance which has longer life span, the frictional force will be larger. The step to check whether any leakage occur in the elevator and decelerator, and the condition of lubricate oil level should be done regularly.

The Development Trend of Belt Conveyor

1. Larger scale
It includes several aspects, such as large transmission capacity and single equipment with long length .Now the world's longest length of hydraulic conveying equipment is more than four hundred kilometers, the longest length of belt conveyor is almost 15 km, and there is also a belt conveyor which can connect two cities together. The world's major developed countries are also researching and studying conveyors with long distance and large capacity of continuous conveying ability structure.

2.Higher performance and better functions
Working in the extreme temperature environment, or the working environment which is corrosive and radioactive, and the belt conveyor can carry inflammable,explosive,high temperature and viscous material.

3. Enable the conveyor to meet the requirements of the automatic control.

 

4. Reduce the consumption of energy to the greatest extent, calculation standards will be based on 1 ton materials transfer the energy dissipations of 1 km, this is one of the most important development trend in the future.

5.Reduce pollution of belt conveyor during operation to reach the goal of protecting the ecological environment.

PK Machinery company is also on the way to this future trend, we offer belt conveyor, bucket elevators, screw conveyor, scraper conveyor and vibrating screen etc. With abundant engineering design experience, professional technical ability and strict fabricating specification, PK Machinery will be the future global leader of mining machinery industry!

The Traction Components and Tensioning Methods of Bucket Elevators

This article is the continuation of previous one which is more knowledge about traction components and tensioning methods of bucket elevators.

3.Heavy hammer tensioning, heavy hammer directly putting the force on the part of lower bearing housing via its supportive stand, This resulted with the lower part is tied up with the respective components throughout its sprocket. By comparing to the hammer lever tensioning method, it has the same tensioning achievement, but it is heavier. Therefore, it has often been used at the plate chain elevator which has heavier components. Occupied smaller space and it is an automatic tensioning method.

4.Compound tensioning, it is a combination of heavy hammer and mechanical spring, the pressure is applying on the bearing at the lower part of the machine. And this causes the lower drive wheel to tie up. A set of compression spring is added in the between of heavy hammer and lower bearing, so that the tail part wheel axis contains certain buffering effect to overcome the pressure when it is overload. However, please remind that both sides of the hammer block have to be equal weight to prevent imbalance.

screw conveyor

The Traction Components and Tensioning Methods of Bucket Elevators

The components of bucket elevator traction include rubber belt, ring chain, plate chain etc. In respect to TD rubberbelt bucket elevator, TH ring chain bucket elevator, and NE plate chain bucket elevator, the selected tensioning methods are different. This is due to the function of each bucket elevator is different. Currently, the common uses of tensioning methods are screw tensioning, heavy hammer lever tensioning, heavy hammer tensioning, compound tensioning etc.

1.Screw tensioning, the screw rod is installed at the bottom of machine, the nuts are fixed on the U-shaped slot of the supporting plate, the supporting plate can be adjusted horizontally by rotating the screw rod, the lower mechanical bearing is fixed on the supporting plate which can cause the lower pulley to tie up the component. This tensioning method is suitable for rubber belt bucket elevator, the rubber belt has certain elasticity which can adjust the tensioning screw rod to ensure the stability of rubber belt after being stretched.

2.The force of the heavy hammer lever tensioning is applied on the supporting plate, the lower bearing is fixed on the supporting plate, so that the lower part of the sprocket is tied up with the respective components. This is an automatic tensioning device. Since heavy hammer lever contains certain degree of mobility, therefore it must always maintain the tension of the compartment for good operation. Usually it is applied to the chain drive of the elevator. In order to have an efficient result, chain skidding and slipping off have to be avoided.

If you want to know more about the components of bucket elevators traction, please pay attention to our the latest FAQ.
It is published by PK machinery company.( www.pkmachinery.com)

Vehicle Type Tensioning Device of Belt Conveyor

Vehicle type tensioning device of the belt conveyor is that the tail wheel is mounted on a moving vehicle. The reversing pulley is connected by wire rope, and it is respectively connected to mobile vehicles and heavy hammer, by the effect of gravity, the hammer will cause automatic tension of conveyor belt. Practice has proved that it is appropriate to take great value of the effective stroke. Vehicle type tensioning device has a wide range of applications, which is not affected by the length of the belt conveyor. The conveyor belt tension can be adjusted automatically, which has simple operation and reliable structure, so the design of tensioning device should give priority to the use of the vehicle type.

Vertical Type Tensioning Device of Belt Conveyor

Vertical type tensioning device is installed between the driving pulley and tail wheel, it should be closed to the minimum belt tension place (driving pulley).When the rubber belt conveyor runs, the structure drives the conveyor belt passing by 90 degree turnabout pulley, then passing by the 180 degree turnabout pulley, tensioning the rubber belt through the heavy hammer which is hanging on the frame. The effective tensioning travel is same with vehicle type tensioning device.

 

Vertical type tensioning device is suitable for the situation that is difficult to adopt vehicle type tensioning device. The advantage is that it utilizes the space of belt conveyor length which is easy to arrange. The defect is that if adopts this type of tensioning device, the turnabout pulley quantity will increase, material will be easily to fall into the place between rubber belt and pulley, which speeds the abrasion of rubber belt and pulley surface . Especially when transporting materials is damp or with larger viscosity ,the abrasion phenomenon will be more serious.

Bucket Elevator Maintenance Notes

1.During operation, all doors must be fully closed; there must be appropriate lighting facility in the place of the lower and upper section inspection doors which open frequently ,if there is failure during operation, please stop the bucket elevator at once and eliminate the failure, if there are any defects are not suitable to eliminate immediately, the impact to the work is nor too much, please keep it in the maintenance record and eliminate the failure when troubleshooting, the supervisor should always check the working condition of each part, but when the machine is running ,all cleaning and repairing work is not allowed.

2.The bucket elevator should be started up without load, and stop the machine before all materials inside the buckets are all discharged. 
3.The tension device of lower bucket elevator section should be appropriately adjusted, keeping the belt with normal working tension, the supervisor should always observe the working situation of bucket and belt, damaged buckets should be removed.

 

4.The bucket elevator can not reverse, if reverses, the chain will run off track, and it is very troublesome to eliminate this problems.
5.Even feeding, increasing the feeding rate suddenly is not allowed .The feeding rate can not exceed the transmission capacity of bucket elevator, otherwise it will be easy to cause material accumulation at the bottom.
6.Add lubricating oil appropriately in time.
7.Replace the chain and bucket which are badly worn or damaged timely.