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.

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. 

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.

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.

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)

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.

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.

 (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.

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.

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.

                                                                                www.pkmachinery.com

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!

 

www.pkmachinery.com

The introduction and application of tension device

Belt conveyor is a transport machine that is driven by friction and it can transport materials continuously. Belt conveyor needs tension force in order to ensure the normal and stable operation of conveyor and meet the friction driving force between the driving drum and the belt. It is very important to choose the proper tension device when we design the belt conveyor.

Functions

1.Tension device can make the belt conveyor have enough initial tension force so that can ensure the necessary friction between belt and driving drum.It also can reserve friction to meet the requirements of friction drive of transmission drum.

2.Tension device can ensure the tension force of minimum tension point in order to satisfy the pendulous restriction conditions of conveying belt so that can make sure of the normal running of conveyor.

3.To provide the necessary route for conveyor belt joint.

Detailed rules and regulations of operational approaches

      When we turn off belt conveyor, the stored energy of conveying belt will release rapidly; and then it will damage its mechanical components and conveying belt itself, especially in the dip angle of belt conveyor and the tension device. When the belt conveyor brakes suddenly, the speed of driving drum will decrease rapidly and the linear displacement will less than the displacement of upstream drum. This characteristics will decrease the mechanical stress of upstream conveying belt and the deformation of belt will smaller, while the mechanical stress of downstream conveying belt will increase as well as deformation. That is to say,when the speed of transmission drum suddenly reduces, the returning conveying belt under the transmission drum caused by the mechanical stress of belt will be strained while returning conveying belt and upward conveying belt below the transmission drum will be relaxed because of the inertia of mechanical equipment. Thus, tension device of conveying belt should pay much attention to its deformation and brake the displacement of upstream position.

How to deal with the phenomenon of bucket elevator returning material too much

The phenomenon of returning material in operating bucket elevator is that the material can’t completely discharge from the bucket elevator but some falls into the inside of machine. When lifting the material, if there is returning so much material, it will reduce production efficiency, increase power consumption and material broken percentage.

 The reasons why there is returning so much material and the approaches to solve them are as following:

1.The speed of hopper is so fast. When the bucket elevator lifts different materials, the speed of hopper is different. In general, lifting dry powder or granular material, the speed is about 1~2m/s; lifting lump material, the speed is about 0.4~0.6m/s; lifting wet powder or granular material, the speed is about 0.6~0.8m/s. If the speed is too fast, the material will be discharged in advance and then causes the phenomenon of feeding material back. At this time, we should bring down the speed of hopper according to the lifting material.

2.The discharge tongue plate in die exit is installed improper. If the discharged tongue plate is far from dumped position, it will cause return material. So we should adjust the position of tongue plate in time.