Three Types of Conveyor Belt Stretching

1. Elastic stretching
   1. Happens at the time of belt conveyor system acceleration or braking deceleration;
   2.  Happens at the time when pulling stress disappears, and can almost be fully recovered.

2. Structural stretching
   1. The possibility due to the conveyor belt fabric type is higher than that due to the textile type.
   2. In the fabrics that weaved according to traditional types, the frizzy

Yarn is easily to stretch when the belt conveyor system is loaded, certain part of this conveyor belt stretching is unable to be recovered.

3. Permanent change in length (permanent stretching)

Mainly caused by the fundamental fabric structure stretching, unrecoverable elastic stretching or structural stretching.

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Function of Comb Roller

Comb roller is also named comb sweep roller,it not only has a good leakproofness，but also has many omnibus characteristic，such as wear resistance,fatigue durability,corrosion resistance,ageing resistance,tear resistance,buffer performance,good elasticity,etc.It is usually installed on the return segment,the structure of comb roller is more complex than ordinary roller,as shown in the following drawings,there are some quantity of rubber rings on the roller surface,to avoid the direct contact between roller and belt,so it makes a good protection for rollers,in addition,the maintenance cost of comb roller is much lower,once roller wears,only need to change the rubber rings.
The comb roller also can protect the belt,during conveying,some material will spatter on the return belt inner surface,if don’t clear them in time, they will wear the roller and belt,even cause the belt deviation,however,comb will solve this trouble,because there are intervals between rubber rings,the material which spattered will fall into the intervals,they will not wear the belt,and because of the comb roller structure,the material will be cleaned up.

What’s the Developing Trend of Belt Conveyor?

Low-end products occupy a large proportion in belt conveyor industry, with the daily improvement of the technology, changes would be made in the future development of the belt conveyor manufacturer. The forthcoming belt conveyor system should contain the following 5 features:

1. High conveying capacity and speed;

This also means high productivity and low manufacture cost in unit time.

2. Long service time;

The abrasion between the conveyor belt and the roller is the main reason that restricts the service time of the belt conveyor. It needs further improvement in the future design.

3. Low cost of production;

Adopting non-roller support or non-contact support is the most efficient way to lower the belt conveyor cost.

4. Low power consumption ;

80% of the belt conveyor power is consumed in friction wastage. To reduce friction wastage, the most efficient way is adopting non-contact type belt conveyor.

5. More intelligent.

It would be closely associated with microcomputer and intelligent operation would be reached in the future.

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How to Correctly Make Maintenance for Belt Conveyors

As we all know, correct and proficient operation is the guarantee for the efficient working of the belt conveyor.

Excluding the impact from the sundries in the material, in order to improve the conveying efficiency, operators should pay attention to the following points:

1. Make fix and appropriate installation of the belt conveyor machine.
2. Check the belt conveyor before operation.

Make sure the protecting device is all ready, the belt tension is adjust to appropriate degree and so on.

3. The belt conveyor should start with non-load and then be fed after its normal operation.
4. If there are several belt conveyors operate in series, then they should be started in order from the discharging port. Do not feed materials until all conveyors are operated normally.
5. The working condition of the belt conveyor machine. The temperature of the conveying material should between 50℃ and -10℃, and materials with acid and alkali should not be conveyed.

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The Use Skill of Corrugated Sidewall Belt Conveyor

Corrugated sidewall belt conveyor is widely used in material handling industry. It has a lot of advantage, higher transportation capacity, the material is not easy to leak, slide prevention etc, it is welcomed by the masses of customers. So what are the use skill of corrugated sidewall belt conveyor in the process of using ?Here, Henan Pingyuan Mining Machinery Co., Ltd answers for you.
1.It is strictly prohibited to use different belt together.
2.The transport direction of the material and the dropping speed of material should be consistent with belt conveyor.
3.Non-load machine start, in order to avoid motor overload and large angle conveyor belt skid, before shutdown, all material should be unloaded completely.
4.When using corrugated sidewall belt, you should prevent belt folding and hard objects pressing, it should be curly using and preservation.
5.Corrugated sidewall belt tension should not be too big, please guarantee that it is used under the minimum tension.
6.In the using of corrugated sidewall belt, if there is a sliding or pulling up phenomenon, you should timely troubleshooting, adjust the tension system, keep the elastic device is flexible.
7.If there is belt deviation or sinusoidal running , you should adjust it timely.

Type and Feature of Belt Conveyor Tension Device

Tension Device is one of the core compositions in the belt conveyor, mainly used to supply certain tension force for the normal operation of the conveyor belt. Therefore, selecting proper tension device is the key to design belt conveyor. There are three types of tension device, in the following the feature of these three device would be introduced.

1. Screw-type tension device

The screw type tension device is installed at the tailing pulley of the belt conveyor and adjust the tension of the conveyor belt through regulating the screw to make it move.

It is generally applied in the belt conveyor with belt length less than 60 meters and small power. The series of belt conveyor tension device including 500mm and 800mm there stow kind.

2. Vehicle-type tension device

The vehicle-type tension device means installing the tail pulley on the movable vehicle, and use the steel rope to connect the vehicle and heavy hammer separately through the revising pulley, this automatically tension the conveyor belt by the gravity of the heavy hammer.

3. Vertical hammer type tension device

The vertical hammer type tension device is installed between the transmission pulley and the tailing pulley, and should be close to the site with least tension. It reacts quickly when the belt conveyor starts working with good tension effect. 

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The Pulley Diameter Analysis of the Belt Conveyor

In the designing of belt conveyor, the correct selection of pulley diameter is of great significance. The conveying belt use conditions improve with the increase of the pulley diameter. However, with the same other conditions, increasing the pulley diameter will correspondingly increase its weight, the transmission ratio,amount and size of the reducer. Therefore, the pulley diameter should not be too small to ensure delivery with normal operating conditions. Thus, traditional pulley diameter directly affects the whole cost and weighting the driving device of the conveyor belt.

In the selection of the pulley diameter, the factors below are generally considered:

1. The thickness of the conveying belt and the bending stress related to the thickness when it enlaces the pulley.
2. The total stress that the conveyor belt bears, including the pulling stress and the bending stress.
3. The maximum or average unit stress between the conveyor belt and the pulley surface.
4. The circle times that the conveyor belt bears bending load, the enlacing methods and number of its rolling the pulley.
5. The type of the conveyor belt and installation site.

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How to Select Model of Belt Conveyor

Belt conveyor is a continuous material delivering machinery by rubbing the drive with its main constitute including the frame, conveying belt, pulley, roller, the tightness adjusting device and the gearing device. It can deliver the

material from the primary feeding port to the ending discharging port.

Several aspects listed below are what we should pay attention to in the selection of thebelt conveyor.

1. Weight of the conveying material, external;
2. Dimensions, and handing method;
3. The length of the conveying line and its complex degree;
4. The working condition of belt conveyer and its work shift;
5. the running speed and productivity of the belt conveyor;
6. Special technological requirements.

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Brief Introduction of Belt conveyor Sweeper Type

Belt conveyor sweeper is one important part of belt conveyor, there are totally three types of belt conveyor sweeper: carbide belt conveyor sweeper, H type alloy rubber belt conveyor cleaner, P type alloy rubber belt conveyor cleaner.

1.Carbide belt conveyor sweeper

The Carbide belt conveyor sweeper is installed at the head pulley with the texture of scraper adopting carbide alloy. There are generally two types of it: single piece belt conveyor sweeper and double pieces belt conveyor sweeper. It realizes thoroughly material cleaning by changing the pressure beard by the conveying belt from the scraper through adjusting the balancing weight.

2.H type alloy rubber belt conveyor cleaner

It is installed at the head place of the pulley close to the conveying belt, principally applying the rubber elasticity. Meanwhile, the scraper texture is changed to Carbide scraper from rubber. It is placed close to the surface of the conveyor belt after the separation of the material with the conveyor belt.

3.P type alloy rubber belt conveyor cleaner

It is also installed at the head place of the pulley with the installation site similar to that of the spring sweeper. Besides, it shares the sweeping principle with the H type alloy rubber cleanser.

For more information, please visit http://www.pkbeltconveyor.com.

Step Analysis for the Installation Process of Belt Conveyor

There are seven steps in the installation process of belt conveyors, here are some tips analyzed by experts from PK machinery.

1 .Installation of the belt conveyor landing leg and intermediate frame

Please confirm the Centerline by using the theodolite before installation, then according to the centerline to find pile point location of each landing leg. If there is embedded iron, adjustment should be made according to the location of the embedded iron in order to facilitate the installation, each landing leg should be firmly welded with the embedded iron.

2 .Installation of the counterweight device

In this process we need to ensure the parallelism between the two force columns, and meanwhile ensure its verticality. Considering the safety, protective railings shall be immediately installed after finishing the installation of this device.

3 .Installation of the headstock, tailstock and drive device base

Firstly we should verify the install elevation and confirm the centerline. Then pay attention to the sizing block location and its number not more than 5 blocks. The thinner sizing block should be placed among the thicker ones and be firmly welded.

4 .Installation of the roller and carrier roller

Before the installation, we should check the rotary condition of the bearing and repair or change it in time if there is any problems in the rotating.

5 .The Unit Installation

The unit axis deviation is 0.02 mm; the radial error of coupling is 0.05 mm, the Clearance between the half couplings is 3 ~ 5 mm. the levelness and usage of the sizing block should also meet the specification requirements.

6 .The belt installation

The belt installation should be operated by the manufacture or the professional.

7. Oil the belt conveyor and make debugging

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Suggestions on Lubricating Points and System of Belt Conveyor

As we all know, regular maintenance and proper maintaining methods is essential in the daily operation of the belt conveyor.  Poor maneuverability would appear if the equipment has been used for long time, therefore we need to clean and lubricate the conveyor. Here our experts share some suggestions on the Lubricating points and methods with you.

  1.Lubricating Points

The lubricating points contains motor bearings, roller bearings, shaft sleeve bearings, bearing, gear reducer, the roller bearing and so on.

Roller is the most commonly used rotating parts of the belt conveyor, its quality and service life has a great influence on the belt conveyor running efficiency and reliability. The roller is equipped with bearing. Due to the gear reducer, its structure is relatively concentrated, with many parts needed lubrication, such as bearing pedestal, bearing gear and the meshing gear. In contrast, the structure of the roller bearing and motor bearings is relatively dispersed, especially the belt conveyor with long conveying distance. Each part is singly equipped with lubricating device.

2.Lubricating system

•  Manual lubrication system

The manual cleaning separator grease station should be installed in the center of the lubricating system. The distributer should be fixed in the device which needs lubrication, with its installing station convenient for observation and maintenance. Cold rolled seamless steel tube can be generally chosen as to the texture of the lubricating pipeline.

• Electric lubrication system

The electric lubrication is generally installed in the central part of the electric lubrication system, and usually need to set up special lubricating state with assurance of tidy and clean. The differential pressure switch is generally installed at the end of the main pipe line, behind the switch there should be installed a distributor. The piezometer however is commonly installed near the switch. The requirement for the texture is same as that of the Manual lubrication system.

Do you Know About the Installation and Adjustment of the Pull Cord Switch on the Belt Conveyor?

Do you know about the installation and adjustment of the Pull Cord Switch on the belt conveyor?
Pull Cord Switch is commonly known as "emergency stop switch". When the belt conveyor need downtime, Pull Cord switch action will stop the conveyor. Pull Cord Switch can be divided into manual reset and automatic reset. Automatic reset: after action, it can automatically return to the initial position, may lead to error start. Manual reset: after action, the self-locking device can maintain the operating position, it need to manually reset handle to make its return to the initial position.
Pull Cord Switch should be installed on both sides of the conveyor where has a maintenance channel, installation position should ensure that the maintenance person operates conveniently in the event of an emergency.
1.Pull Cord Switch is fixed on the rack.
2.The distance of the two switches on one side is about 50 m, the two switches are connected by the diameter 4mm of wirerope, elastic should be moderate.
3.To reduce the influence of the weight of wire rope on switches, we install supporting ring on the frame every 3 m to support the steel wire rope.
4.The other end of the rope is in tension spring (with rope buckle), In a way not affecting the normal use, using tightener to pull the rope tension on both sides, and to ensure that tension is balanced on both sides.
(Note: The climbing section of the conveyor, should try to shorten the Switch spacing distance and the pull rope length.)

What are Types Of Belt Conveyor Pulley Surface Coating?

 Belt conveyor pulleys play an important role in belt conveyor, such as transmitting traction for belt conveyor; changing direction of the conveyor belt; increasing the friction etc. Pulley surface coating on one hand,it can protect the conveyor belt from debris hurt ,on the other hand it can increase the friction between the conveyor belt and pulley, ensure normal conveyor belt running direction. 
There are 3 types of surface coating which we commonly used: smooth surface coating, herringbone coating, diamond coating. Usually, Smooth surface coating is used for bend pulley which can increase the service life of pulley, reduce the friction between conveyor belt and pulley cylinder, then the pulley surface will not be corroded by material. Herringbone coating is commonly used for the transmission pulley, since the transmission pulley drives running of conveyor, strong friction will generate on the transmission pulley, so we adopt herringbone coating. Herringbone coating is suitable for the belt conveyor which conveys material in one way,while the diamond coating can be applied to the reversible belt conveyor, which can realize the unloading material bidirectionally.

Belt Conveyor Trippers Were on Their Way to Thailand

“All products meet clients’ specific requirements” is what we have promised.

Right before 5 days ago, we reached an agreement with our clients from Thailand, promising to deliver belt conveyor with tripper and circular vibrating screen what they had reserved. The belt conveyor with tripper refers to a particular equipment worked for wooden chip production line which will be settled at the top of warehouse to reach a maximum utilization rate of its space. 

Besides, their belt width are 1000mm and 650mm, length 25mm and 42mm.While circular vibrating screen is available for separating wooden chip with a size scale larger than 50mm, and stone size smaller than 4mm.

In addition, our clients are in need of metal detector, permanent magnet and drum separator as well. The permanent magnet settled at the feeding end is designed for isolating metals from material, while metal detector and drum separator are applied to eliminate the metal appeared in the production line.

What Causes the Failure of Belt Conveyor Components and the Solution

Basically, we cannot avoid the failing in work of belt conveyor. The following several points are common phenomenon of belt conveyor components failure analyzed by PK Machinery. We hope to bring you some assistance.

1. The belt fails in rotating;

The drive pulley belt slips and turns without moving forward after the starting of the belt conveyor motor. The belt failing in rotating is due to the insufficient belt tension, overlong of the belt, inappropriate adjustment of the tension equipment, too frequent start-up and the coal piled up at the end of the belt conveyor.

2. Belt is easy to break ;

This problem is mainly caused by the large belt joint, poor belt buckle quality, long time use of the belt and the unprofessional belt maintenance. In this case, we should tighten the tension equipment, change high quality belt in time and improve the maintenance level.

3. Abnormal sound from the reducer

One possible reason is that the abrasive wear of the bearing and gear causes a large gap between them. Or it is because the screw is too loose. In this case, we should replace the bearing, mend the gap and maintain or replace the reducer.

4. Temperature of the reducer rises too fast

It is due to the over mount of lubricant, poor heat dispersion, speed reducer burying in coal. The lubricant oil amount should be reduced and the coal should be removed to solve this problem.

5. Lubricant leakage of the reducer

The main reason includes the sealing ring is damaged, the reducer surface is not flat and the bolt is too loose. In this condition, we should change the sealing ring, tighten the connecting surface and the bearing cap bolts.

6. The roller failed in rotating

If the coal powder falls into the roller sealing ring, it will block the conveyor roller and cause strong stress, then the roller would not rotate and even bend. And thus bring damage to the roller bearing. If this happened, we should replace the roller, lower the height of discharging point and the landing point, or use impact roller at the landing point.

Key Factors to Avoid Belt Skid of Movable Belt Conveyor

Movable belt conveyor is a portable continuous conveying equipment, which has the advantage of convenient movement, high efficiency and easy operating. It can convey bulk material, and bagged material is also in its working range.The lift angle and height is allowed to adjust. Belt skid problems may sometimes be meet in the daily operation, PK machinery is an expert in solving this problem, here are two suggestions:

1. Adjust the belt tightness of the conveyor.

The tightness is a key factor to impact the operation of portable belt conveyor. You can tighten the belt through screw tensioning or hydraulic tensioning to solve the belt skid problem. It probably causes permanent deformation to the belt if the tension range is not enough, in this case, we need to cut a piece of belt off and then vulcanize the belt.

2. If large range of tightness is required while using nylon or EP belt, we can also vulcanize the belt to solve belt skip problem and thus reduce damage to the conveying belt.

We PK Machinery is the most professional manufacturer of  Vibrating screen, Bucket elevator, Screw conveyor, Scraper conveyor.Possessing the world’s most advanced technology, we are ready to meet any needs of customer with the goal of being the future global leader of mining machinery industry. Any questions of you will be highly appreciated, please contact us without hesitation.

How to Extend the Service Time of Belt Conveyor

One main factor of impacting the belt conveyor service time is the conveyor belt quality. Therefore high quality of conveyor belt is required in purchasing. Another main factor is that the sweeper is highly reliable to make sure no more material adhered to the return belt, in case they are next sent to the surface of the drive pulley and bend pulley, thus bring damage to the belt and shorten its service time:

Due to how to greatly expand the service time of the belt conveyor, Followings are some suggestions:

1. Avoid belt slipping on the drive conveyor pulley. Please find the reason and give prompt adjust if slipping appears.
2. Check the conveyor belt joints frequently. Damaged conveyor belt joints should be repaired or replaced in time.
3. Check the service condition of the belt conveyor roller regularly. Properlubricating grease should be added into the sealing machine in the maintenance, and also inflexible rotating rollers should be replaced immediately.
4. High quality of lubrication should be added into all rotating parts of belt conveyor periodically according to the requirement.
5. Ensure the good work condition of the cleaning device and replace damaged parts in time.
6. Regularly check the conveyor belt tensity. Prompt tension is needed if the belt is loose. Meanwhile please notice the belt position, timely adjust should be made when it’s off tracking.

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Why will Belt Conveyor Pulley Wear?

Belt conveyor is a kind of common conveyor equipment, often used in a variety of material transportation with large throughput, stable performance. In the process of using, pulley may occur wearing, this phenomenon is caused by two reasons:
One reason is that the design gap between roller bracket and pulley is too small, at the same time, building foundation hole vertical distance is less than the pulley support distance.In the process of belt running, overlarge belt tension will result in the change of its traction.Return accretion has not been cleared up, which will form accumulation debris and occur rubber friction.For design factors,as the space between pulley stents and pulley is too small, and the base hole of the vertical distance is less than the pulley support distance, it is not easy to handle timely, which is the main cause of pulley rubber lining wear.
Work environment factor is the second reason leads to rubber lining equipment damage phenomenon.

Belt Conveyor Safety Operation Regulation

Belt conveyor is a kind of continuous conveying equipment. Can be widely used for quarry, coal, steel, chemical and other kinds of industries. Operating the belt conveyor safety, not only can make sure the safety of the operator, but also can longer the service life of the belt conveyor. PK machinery will introduce the safety operation regulation of the belt conveyor:

1. The belt conveyor should start without load and should not feed material until it operating regularly. Forbidden feed the material before starting.
2. Fixed belt conveyor should be installed on fixed foundation. Before the mobile belt conveyor operating officially, wheels should be holdback through triangular wedge or brake. To avoid move during operating, there should be an 1 meter channel between each machine if multi-set belt conveyor operating parallelly.
3. Before using the belt conveyor, we must check whether all the moving parts, belt buckles and bearing device is normal or not; whether the protective equipment is completely or not. Belt tensioning degree should be adjusted to the appropriate level before starting.
4. Forbidden stand on the conveyor belt.
5. If multiply sets belt conveyor connection with each other one by one, we should start the one in discharge end first, then start the other sets according to their order. You can feed the material once all of the equipment operating normally.

Belt running deviation and skid processing method of belt conveyor

• Running deviation has many reasons, according to the different reasons , we need to different treatment:

1. Adjust the carrying idler group.
2. Install the self-aligning roller group.
3. Tension adjustment, tension adjustment is an important link of belt conveyor running deviation.
4. Adjust the driving drum and redirection roller position. And the adjustment of the redirection roller driving drum is an important part of the belt running deviation adjustment.
5. Two-way adjust deviation of belt conveyor.

• Belt skid treatment method:

1. Adjustable tension when the belt conveyor in skid trip to increase tension. Sometimes tensioning trip has not enough, however, belt in the permanent deformation , the belt can be cut part to and sulfide.
2. In the use of nylon belt or EP,tension travel is longer,  when tension trip has not enough, sulfide or increase tension to solve.
3. Heavy hammer tensioning belt conveyor belt skid can add weight to solve,  added until not skid. But should add not too much, avoid belt  bear too much unnecessary tension and reduce the service life of the belt.

Guide Rail Makes Tripper or Bucket Elevator Perform Better

Guide rail is made of metal or other material to become groove or ridge which is a device that can withstand, fix and guide mobile device or reduce their friction. Longitudinal groove or ridge on the surface of guide rail is used for guiding or fixing machine parts. Moreover, it is also known as sliding rail or linear guides, used in the occasion of linear reciprocating motion. It has a higher rated load and can assume certain torque. At the same time, high-precision linear motion can be achieved in the case of high load.
Guide rail provides a precise operation track for the conveyor tripper car. Matched with the belt conveyor, conveyor tripper car can achieve the aim of discharging materials at any points in the certain length of belt conveyor through moving back and forth on the guide rail.

In general, guide rail is installed in the head, tail and middle part of chain bucket elevator. Also, it is usually made of wear-resistant steel and its surface is quite smooth, so on the one hand it can lessen the friction between chain and guide rail and reduce components depreciation rates, on the other hand it can prevent the chain being off tracking, so as to achieve the purpose of conveying materials efficiently.
PK Machinery adopts the best quality guide rail which is manufactured by Ma'anshan Iron&Steel that is best rail manufacturer in China, and it is used for conveyor tripper car and bucket elevator.

Matters should be noted during belt sway switch installation and adjustment

Matters should be noted during belt sway switch installation and adjustment 

Belt sway switch is used to check the belt running deviation of the belt conveyor, it is a safe protection device of automatic alarm and stop when the belt running deviation appears.Belt sway switch is fixed on the conveyor belt bracket, action bar is at the side of the belt, when the belt running deviation appears, force the action bar deviation, and touch the alarm micro switch. If the belt running deviation continues,will touch another group of contact, and the conveyor will be protective to stop.
In the installation and adjustment of belt sway switch, what matters should we pay attention to? PK Machinery will answer for you!
1. Belt sway switch should be located on both sides of the conveyor belt, the vertical roll should be vertical with conveyor belt edge flat, and both sides of the conveyor belt are located at 1/3 height of vertical roll.
2.The distance between the vertical roll of belt sway switch and the normal position of conveyor belt should be 50 ~ 100 mm.
3.The quantity of belt sway switch ought to be determined according to the length of the conveyor, types and arrangement. Commonly it is located on the conveyor head, tail, convex segment, concave segment and the middle position.(Note: when the conveyor is longer, a pair of belt sway switch can be located every 30 ~ 35 m.)
4.Belt sway switch connects the conveyor middle frame through the mounting bracket, switch bracket will be welded with conveyor frame after the installing completion of the conveyor, and belt sway switch shall be bolted in the bracket.