How to Judge the Failure According to the Noise of Belt Conveyor?

1.When there is severe roller eccentricity 
There always occurs abnormal noise with periodic vibration when belt conveyor rollers runs, especially the return roller. The reason is that its length is bigger, weight is heavier and the noise is bigger .There are two main reasons of the noise:
1. the seamless steel tube wall thickness is not even which generates large centrifugal force;
2. the center of two bearing ends hole center and the outer circle center has big deviation which leads to large centrifugal force.

 

2.When the two axis of coupling are not concentric
The coupling of high speed motor of driving device and reducer or coupling with brake wheel occurs the abnormal noise, along with the vibration same with motor rotation frequency. Please adjust the motor and gearbox position timely in order to avoid fracture of gearbox input shaft.

3.Bend pulley and abnormal noise of the driving drum
During operation, the noise of turnabout pulley and driving pulley is small, the bearing usually damages when there is noise, please replace the bearing timely.

 

  

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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.

Do You know the Solution if Motor Base of Bucket Elevator Vibrates?

(1) The bucket elevator motor itself rotates abnormally, please take down the rotor and check the static balance.
(2) The installation precision of gearbox and the motor is poor, the centring exceeds the required range, please readjust the centring.
(3) The installation precision of motor base is not good enough, levelness exceeds the specified requirements, motor, please take down the motor and machine the motor base again.

 

(4) There is error in installation of sprocket, please readjust to guarantee the concentricity of large and minor sprocket. 
(5) The sprocket tooth profile is poor, please take down the sprocket and machine the tooth profile again, to ensure the consistency of the tooth profile.
(6) The tightness degrees of sprocket is inappropriate ,please adjusted length and maintain moderate tightness.

Introduction of Three Types of Belt Conveyor Cleanser

1.P type alloy rubber cleanser
It is installed in the place of head pulley, the installation position of P type alloy rubber cleanser is similar to the spring cleanser, compared with the spring cleanser, it is mainly with the help of rubber elasticity, at the same time the hard alloy scraper cleanser presses close to conveyor belt surface after material separates from the conveyor belt, cleaning the material which is stuck on the conveyor belt.

2. H type alloy rubber cleanser 
It is installed in the place of head pulley and close to the conveyor belt, the cleaning principle of H type alloy rubber cleanser and P type alloy rubber cleanser is the same.

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3.hard alloy scraper cleanser 
Hard alloy scraper cleanser is installed in the place of head pulley, the material of scraper is hard alloy, it has two types: single piece and double piece. You can adjust the counter weight to change scraper stress to conveyor beltto achieve the effect of cleaning materials.
 

What Should We Note When Screw Conveyor Conveys Material?

Screw conveyor normally works in the environment which is full of dust, so the bearing also works in the dust which leads the bearing wears seriously, therefore lubrication on a regular basis is an essential job in our daily operation. In the process of conveying material, we must pay attention to the following six items:

1.When screw conveyor starts to convey materials, please increase the material gradually and evenly, don't feed the material to the rated capacity one time, otherwise it will cause blockage, driving device overloads and will short the service life of screw conveyor.
2.Make sure there are no materials with large block and hardness, otherwise the screw conveyor will be stuck by materials and damages.

3.Start up the screw conveyor without load, feed the materials after the screw conveyor starts up.
4.Shut down the screw conveyor when there is no material, stop feeding material before shutting down the screw conveyor.
5.Check equipment parts regularly, take protective measures in advance.
6.During operation, must not to take down the cover plate or it will cause so as not to cause personal injury.

What shall we do if YK circular vibrating screen bearing gets hot ?

The working principle of YK circular vibrating screen: it needs exciting force to drive the sieve surface, then it will generate a certain frequency and amplitude which makes the material screened on the sieve surface and get different sizes of material. But in the process of operation, the exciter rotating speed will slow down and the bearing will get hot, if you have such problem, please send the operator to stop the machine and inspect it immediately to ensure the normal operation of circular vibrating screen.

 

YK Circular vibrating screen exciter drives the symmetrical eccentric block structure rotates at a high speed, when the eccentric block falls off after working for a long time or eccentric block size gets inconsistent, it will lead to abnormal speed. So we need to replace the eccentric block timely to ensure same eccentric block sizes and balanceable running .When circular vibrating screen bearings rotate at an abnormal speed, it is easy to occur friction and temperature rise.
When YK circular vibrating screen bearing lacks of lubricating oil or the lubricating oil additive does not comply with the equipment requires ,the sealing device will get blocked, the temperature rising value will exceed specified range. So we need to inspect the equipment lubrication system to ensure it is clean enough, if there is blocking phenomenon, please take down the bearing and clean thoroughly. If sealing gasket gets broken or bearing gets worn, please replace sealing gasket and bearing timely, readjust the circular vibrating screen and start the screening operation .

Chongqing Chamber of Commerce Visited PK Machinery Company

On 22rd June, Chongqing Chamber of Commerce came to PK Machinery company to for mutual learning exchange and promoting development.

They visited our workshop and watched the test running of gyratory screen, bucket elevator,scraper conveyor,vibrating screen etc., we also analyzed and discussed the machinery market situation in the next five years. The chairman from Chongqing Chamber of Commerce spoke highly of our belt conveyor rollers production line and production ability capacity and was satisfied with our products and he also expressed his wish that PK Machinery would take a big stride forward in mining machinery industry!

After visiting our workshop, we had a deep discussion on social media marketing in the multimedia conference room, PK Machinery showed what we were doing at present concerning social media, Chongqing Chamber of Commerce also shared their achievements with us, both of us benefited a lot from this meeting.

 

There goes a saying :If you want to go fast, then go yourself, if you want to go further, let's go together! PK Machinery welcome friends from all over the world to communicate with us at any time!

How to Clean the Remaining Material of the Screw Conveyor?

 There are two kinds of screw conveyer : tubular type and trough type. According to different designs , the cleaning method is also different.

Tubular screw conveyor: it has two cleaning methods since the casing is a steel pipe: water injection cleaning and ventilation cleaning. Water injection cleaning means that inject a large amount of water at the inlet and wash the internal tube, flushing the remaining water out of screw conveyor. Ventilation cleaning which uses the air pump or fan to bring the air inside the tube and blow the material out of the tube. The two methods are very convenient to clean up the material inside the tube.

Trough screw conveyor: since the casing is trough type and there is cover plate on the trough casing, so please take down the fixed bolts when clean the material and remove the cover plate, then start to clean up the material. It is very easy to clean the kind of material, you can also clean it directly by air pump.

After completing operation of screw conveyor, a certain amount of material can not be discharged thoroughly, only when you make sure the machine stops running, you can start to clean the screw conveyor, otherwise there will be accident.

What Problems Will be in the Material Lifting Process of Bucket Elevator?

In the material lifting process of bucket elevator, there may be such problems: insufficient material lifting rate, insufficient material discharging rate and material leakage phenomenon, only they are resolved timely ,the bucket elevator can have best effects .The reasons and solutions are as follows:

(1) insufficient lifting rate:

The material is likely to be caked on the bucket or chute, clean and remove the materials regularly according to caking condition. There is also possibility that the storage capacity of bucket elevator upstream equipment is insufficient which causes less feeding material, as result, the bucket elevator can not reach the design capacity, so we should try to improve the production capacity of upstream equipment. If the speed is slow, we have to change the speed ratio of the sprocket. Or it is caused by improper or wrong material calculation, check the calculator and material proportion, calculate again.

(2) insufficient material discharging rate:

The capacity of bucket elevator downstream equipment is small, make the discharge chute block, so we should improve the capacity of the downstream equipment of bucket elevator. It may also cause by small chute size or inappropriate chute angle ,so adjust the discharging chute. There is also a possibility that the material is caked on the chain bucket or inside the chute, so we need to remove material and maintain the bucket elevator periodically.

(3) material leakage phenomenon:

If the material leaks from the gap of head section and bottom section, please add the sealing gasket or glue with sealant . Replace new sealing gasket ,glue with sealant and tight the flange bolts if there gasket of bucket elevator flange is broken. If it is caused by large material feeding height difference and feeding pressure, please change the material feeding method and add the feeding buffer device.

 

How to Trouble Shoot Bucket Elevator Belt Problems?

As a continuous conveying machinery for loose materials conveying equipment, bucket elevator has been widely used in food, feed, chemical and other industries, it is applicable to vertical conveying for powder, granular and small lump materials. The advantages of bucket elevator are: simple structure, high efficiency, low malfunction, etc. However, failure always happens in our daily operation which will affect the working performance. Here we will talk about the failures and troubleshooting of bucket elevator.

1.bucket belt deviation
A. Failure cause : the main reason of bucket belt deviation is that when bucket belt is stretched, the adjustment is not timely or not appropriate .
B. Troubleshooting: adjust the tensioning device or gravity tensioning device at the bottom of the elevator, make the hopper with appropriate tightness and keep two axis of bucket elevator under parallel.

2. bucket belt slip
A. Failure cause: bucket belt is too long or balance weight is too light.
B. Troubleshooting :if the bucket belt is too long, you can cut a section of belt and hang it well; If the balance weight is too light, you should add balance weight until you belt slip phenomenon is eliminated.

Do You Know Why There is Conveyor Belt Deviation Phenomenon?

Belt conveyor is a common conveying equipment widely used for metallurgy, chemical, electric power, coal, mining, port etc. In the process operation, conveyor belt deviation happens a lot. Here PK Machinery will analyze the reason as follows:
1.there is attached object on the surface of pulley or roller .
2.both driving pulley and the turnabout pulley have external surface error in manufacturing .
3.the head driving pulley is not parallel with tail pulley.

4.the diameter of driving pulley and the tail pulley is different.
5.the center line of driving pulley and tail pulley is not vertical to the conveyor center line.

 

6.the feeding position is not straight.
7.pulley center is not in the center line of conveyor.
8.roller installation is not straight.
9.bad frame rigidity which will easily lead to the deformation.
10.unstaight conveyor belt joint and belt aging metamorphism will cause deviation on both sides.
11.unilateral bearing rotation is not flexible, or it is stained with sundry.
12.abrasion condition on both sides of guide pulley is different .
13.deviation adjusting device damages and doesn’t work well.

 

14. the pulley wrapped with belt is not parallel with the transmission drum.
15.conveyor belt borders on both sides of the centerline are not overlapped, or conveyor belt edges get worn seriously.
16.feeder, discharger and sweeper have installation error.
17.abrasion condition of pulley two ends is different.
18.conveyor belt take-up device doesn’t have enough tension.
19.the layout of feeding direction and conveyor height is not reasonable.
20.roller support gets worn and deflected seriously. 

 

Do You Really Know How to Maintain Bucket Elevator Chain and Belt?

Compared with the belt of bucket elevator, the chain is easier to maintain, so let's first talk about how to maintain the chain of bucket elevator. The chain is made of metal material, the biggest impact is the tensile strength between the scratches and the material in our daily operation, so we need to do two things when we maintain the bucket elevator.
1.Wipe with oil on the surface of the chain, the oil will form a protective layer on the chain surface, thus it can extend the period of the chain scratches cycle when bucket elevator works.
2.The molding of each chain ring is not made one time, we can find there is welding place on each ring of the chain, so we must pay attention to the usage condition of the welding place when we maintain the bucket elevator, if there is crack ,please repair welding timely.

Next we will introduce the maintenance method bucket elevator belt, as we know the belt is soft so it is easy to affected by buckets and conveying materials, sometimes there may have tearing phenomenon, here we have three solutions to solve the problems. 
The first method is hot vulcanizing, it is a method by using of vulcanizing machine, hot vulcanizing material to repair seamlessly with high strength, this method can make the belt eliminate damage and recover completely .
The second method is to cold patching, which is mainly use special belt cold bonding agent ,glue and special tools to repair in filling type, if there is a small area of tearing, this method is very effective. The third method is mechanical repair using by rivet, screws or clip to connect the tearing parts or layer peeling parts together, but one shortage of this method is temporary usage, it can’t use for long-term.

Conveyors Designed for Pakistan Soda Ash Plant were Finished Production

Project name: Dense ash plant expansion project 
Equipment name ,model and quantity:11 units of MS320 scraper conveyor,3 units of TB250 Bucket elevator,4 units of LS315 screw conveyor.

After three months’ production, scraper conveyor, bucket elevator and screw conveyor designed for Pakistan soda ash plant finally have been finished!

With rich engineering design experience and professional technical ability, PK machinery wins the highly praise from clients. We are sure this cooperation will lead a big step and build a solid foundation in Middle East market!

 

PK machinery is a professional manufacturer which has been engaged in designing and fabricating belt conveyor, bucket elevator, screw conveyor, vibrating screen etc. for several years. Further information please click: www.pkmachinery.com.Glad to be your loyal friend!

 

Further information plese click:http://www.pkmachinery.com/news/conveyors-for-pakistan-soda-ash-plan.html 

The Effective Way to Install the Screen Mesh of Linear Vibrating Screen

A. Please pay attention to the coarser mesh size, because the installation of the linear vibrating screen mesh is relatively complicated.
B. When cutting the mesh, keep the screen width and rack width the same, the length must be 50-70 mm longer than net rack.

 

C. When installing the mesh, please tight the screen mesh, because screen mesh tightness is one of the important factors that affects the screening efficiency.
D. When add the bouncing balls, it is important to check the screening difficulty of materials, please don’t add bouncing balls without consideration.
E. If material density or mesh size is superfine, you should install an extra screen mesh with a suitable size under the screen mesh, its purpose is to support the upper screen mesh, and reduce the material pressure to screen mesh and prolong the service life.

 

F. After finishing installing the net rack on the screen box as per requirement, do remember to put the extra screen mesh into the corresponding discharging outlet to avoid material mixing phenomenon.
G. After whole installation finishes, you should test run with few materials to check the material distribution and screening efficiency. If material moves forward evenly and classify accurately, no material mixing phenomenon, then the machine can be put into use. On the other contrary, if there is material off tracking , accumulation or uneven phenomenon, you should adjust the screen surface roughness and uniformity .If there is material mixing phenomenon, you should check whether screen mesh sealing is tight nor not, but if there is uneven material conveying or material mixing phenomenon, you should adjust the linear vibrating screen correspondingly.
 

Different Installation Methods and Characteristics of Linear Vibrating Screen Motor

Linear vibrating screen is dual-vibration motor drive. Two synchronous motors are reversely placed so that the exciter generate reverse excitation force, the exciting force generated by eccentric block cancel each other out on the parallel direction of motor axis, and stack together with the perpendicular direction of motor axis, so its trajectory is linear. But what is the different characteristics of different motor installation methods?

1.Installation on the bottom
Vibrating motor installed on the bottom is not only safe and reliable but also will save a space. But the effective sieving area and the capacity will decrease if installed on the bottom, which would affect the screening efficiency and production progress.

 

2.Installation on both sides 
Motor installed on both sides can decrease the height of the linear vibrating screen. When there is a certain limitation from materials discharging outlet to the ground, you can adopt this of installation.

 

3.Installation on the top 
Vibrating motor installed on the top it is a best way to help customer effectively solve the problem if there is limitation to linear vibrating screen outlet height and width.
Customers can choose the vibrating motor installation method according to production requirements.

The Reason and Solution to Bucket Elevator Material Accumulation

(1) Uneven material feeding. When feeding is too much, the feeding rate exceeds the lifting capacity which makes material remain in surplus and accumulation, besides, the materials inside the base elevates gradually, the running resistance of the buckets increase gradually and reach a certain extent, the rubber belt will slip which will cause machine shut-down or motor burn-down.
Solution: Control the feed rate strictly, non-load operation first then open the gate of material incoming gradually. Observe material rising condition by the front inspection door. When material surface reaches bottom wheel unparallel axis line, the material feeding gate can’t be wide open any more.

(2) Large material returning flow will make material can’t flow to discharge pipe and return to the base, thus the base material is increased and will lead to blockage.
Solution: reduce material backflow.

(3) When machine suddenly shut down due to power failure or other faults, the mass weight of lifting branch and the returning branch is unequal, which makes the bucket elevator reversed, the material inside the buckets return back to the base, it will lead to base blockage when you start the machine up again. 
Solution: Installing a holdback device in the side of the elevator shaft to prevent bucket elevator reversals.

(4) Rubber belt slipping will reduce the lifting capacity of the bucket elevator, thus the material inside the base will increase and block. 
Solution: increase the tension, prevent belt slip.

(5) Big foreign lumped material enters into the base and causes blockage.
Solution: Install guard fences at bucket elevator inlet to prevent accidents.

Operation Procedures of Link Chain Bucket Elevator

Please operate strictly according to the following steps:
1. Non-load running

After the completion of the installation work, then you can run without load. Before non-load test, please guarantee the chain rotates on the sprocket jogged run for around two weeks or more, when there is no touching or abnormal sound ,you can continue non-load running. During non-load running, please check the current and voltage of the main motor and make record, measure the temperature rising of the gearbox bearing parts and each bearing of bucket elevator head &tail section at the same time.
After the non-load running for 4 hours, if there is no abnormal phenomenon, you can stop, and tighten all bolts once more which fixed the buckets. Because buckets are in the right position now during non-load running, after tightening the screws well, non-load running once again for more than 4 hours, then stop. Tight the bucket connecting bolts again, then weld the bolts and nuts well by spot welding.

 

2. Load operation

Bucket elevator already meets the load operation after finishing non-load running, you can run with load after confirming there is no problem with other connected devices. At the start of the load operation the load should be increased from minimum to maximum gradually. In the process of load operation, the please measure the motor current ,voltage and the bearing temperature rising condition and make record, in order to make assessment of trial run, performance, and working condition for the whole machine.

3. Operation
1) Start-up
Bucket elevator will meet the normal operation conditions when load linkage test running is completed. 1-3 minutes non-load running is required before the normal work, then increase the feed rate gradually after operation becomes stable till reach full load operation.

2) Shut-down
Please confirm there is no remaining material inside the buckets after stopping feeding , then running for a period of time again and stop running to ensure that materials in the buckets are all discharged.