Screw Conveyor: 七月 2015

2015年7月21日星期二

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.

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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". If you have any question, please feel free to consult us (E-mail: info@pkmachinery.com) we will give you accurate and timely service.

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.

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Debugging of Screw Conveyor

All the hanging bearings of screw conveyor should be hanging on the connecting shaft reliably without stuck and bending of screw. When installation, adjusting the gaskets number of hanging bearing to make no gap in subdivision surface while a proper radial gap between bearings and connecting shaft.

Hanging bearing should be installed in the center of connecting shaft, the distance between end face and two screw pipes should be over 10mm when D≦400mm and over 20mm when D≧500mm.

To adjust the accumulative error between chassis and screw, there should be padding asbestos lining between the flange of the chassis when installation. Padding waterproof canvas between chassis and cover according to the requirements for sealing.

When the difference of center heights of driving gear reducer shaft at low speed and screw conveyor is too much, using the gaskets to adjust the height of driving unit.

When no-loading running, if there is oil leakage phenomenon, removing the bearing and adjusting the tightness of spring in sealing ring until no leakage.

When no-loading running, overheating of hanging bearing indicates the installation position of hanging bearing is improper which leads the locking of connecting shaft, there should be loosing the fasten bolt and adjusting the position of hanging bearing.

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The application and layout of LSY screw conveyor

LSY screw conveyor is widely used in chemical industry, metallurgical industry and paper, construction and other industries of loose material’s conveying, such as cement, coal, carbon black, soda ash, flour, grains and paper pulp, etc. Because the machine can move at will, as well as can transport continuously at the level, tilt, vertical anywhere, it is especially applicable to the field of mobile operation, such as concrete mixing plant, material storage operation and other situation. All of those advantages can embody this machinery’s advanced nature and superiority.

LSY screw conveyor belongs to stationary type. It is combined as a whole by the drive motor reducer casing pipe helix which linked together in turn. The shaft end and spirochete connect by involute spline (or rectangular spline). And it is convenient for installation,has large carrying capacity, safe and reliable. Conveyor shell is made of steel pipe for whole paragraphs by flange connection, so it has good overall rigidity. Then it can choose work position, work attitude and dismantling moving at will. Feed and discharge port can be made needed angle according to the job site situation and connection with other equipment. Its screw blade is the overall connection blade which is made by disc steel belt, and the rotation surface has a high accuracy. Also, the size of inner hole and external diameter is accurate, and the condition of transportation is best (if it adopts monolithic welding blade, it must meet the above requirements).

All material is suitable for the occasion of screw conveyor can use LSY screw conveyor to transport continuously, whether it is horizontal, inclined or vertical state. Especially when convey at inclined and vertical, it can be fixed directly instead of form a complete set of equipment connection. And it makes full use of space but does not need foundation. It has good sealing, no dust and pollution leakage phenomenon. That is to say it can not only do not waste material but also create a good working environment. This machinery has small diameter, high speed, and especially is suitable for the inclined and vertical transmission. In view of the above structure features and performance, LSY screw conveyor will get widely application. It is not only the GX screw conveyor updated products, but also can replace other forms of conveying machinery on many occasions.

The use of model: First, when the material is suitable for screw conveyor, users can confirm the screw conveyor model specifications, location and length according to their requirements and the process arrangement. Concrete mixing station and capacity of screw conveyor angle shall not be more than 50 °, otherwise it will greatly reduce the delivery efficiency. Feed and discharge port are connected by flange, bag link, universal excuse. The shell joint sets up waterproof device. The craft porthole is also carefully modified, it can avoid accident which due to rainwater caused tube material agglomerate plugging material and braised machine.

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Common Troubles and Solutions of Screw Conveyor

1. Connecting bolts are easy to be broken.

Connecting bolts in head section support the torque of load motor of screw conveyor which is composed of several screws. And connecting bolts in middle and tail sections support lower torque. So bolts in head section is easy to be broken.

Solution: Use high-strength bolt in head section, or use three connecting bolts if necessary to ensure the normal operating and avoid the connecting bolts are too short.

2. Hanger bearings are easy to wear.

There are many factors affecting the wear of hanger bearing, such as working environment, conditions, property of conveying materials, structure type of hanger bearing, quality, etc. Especially when hanger bearings are buried in materials in operation, and the sealing and lubrication are not good, it is easy cause that materials enter bearing and shaft neck contact surface and make wear quickly.

Solution: Select bearings with wear resistance and high quality, and ensure good sealing and lubrication to extend the service life of hanger bearings.

3. Screw is broken because of improper installation position of hanger bearing.

Solution: Install hanger bearing which is concentric with connecting shaft, and ensure that all hanger bearings concentricity and keep the coaxility of screws. The hanger bearings should secure connection, and keep a proper gap with connecting shaft to ensure the flexible rotation of screws.

4. Blocking in inlet.

It is easy to occur blocking for materials with strong arch feature, high humidity, big blocks, etc. Especially in the situation of non-uniform feeding.

Solution: Don’t feeding the material non-conformity to the requirement. And keep uniform feeding without beating inlet.

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Common trouble of screw conveyor

Common trouble of screw conveyor

1. Screw conveyor blockage

2. Screw conveyor give out noise

3. Screw conveyor bearing heating

Screw conveyor troubleshooting

1) Screw conveyor blockage

Strict enforcement of operation rules, make sure that when the machine start and stop it is no-load and feeding continuous and even or increase the outlet. The reason doing this is that solve the problem of blockage or too late to discharge avoid screw conveyor blockage.

2) Screw conveyor motor burning out

If the incoming material is too large then it will result in the motor loading is too large, the motor will heating and burning out. In order to avoid motor heating result in motor burning out you should keep feeding uniformly and finish the conveying before the machine stop.

3) Screw conveyor gives out too much noise

If the inner shaft or both axes head occurs bend will caused friction between screw blade and tube wall. The reducer and motor will be burn out if you do not deal with the problem of screw conveyor gives out too much noise immediately.

If you start the screw conveyor occurs problem of excessive noise, you should stop the machine immediately. Then take out the inner shaft of the screw conveyor to check out that whether the spindle nose bend or shaft bend. After confirming the problem then you just need to adjust it.

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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.

Troubleshooting of Screw Conveyor

1. Connecting bolt broken easily

As for the screw conveyor made up of couple sections, the connecting bolt located in the head section bearing the full motor torque, while the rear screw segments and the connecting bolt bearing the decreasing torque. Therefore, the connecting bolt located in the head section broken easily.

Solution: Using the high-strength bolt in the head section, if necessary, you can also adopt three bolt connect, so that insure the screw conveyor can normal operation and avoid the connecting bolt become shorten

2. Suspension bearing wear easily

There are many factors can affect the suspension bearing wear, such as working environment, working conditions, the characteristic of conveying material, suspension bearing structure, quality etc. Especially when operation the suspension buried in the material, if sealed and lubricated is not good enough then the material particle will easily fall into the connecting surface of bush and journal, which will make wear faster.

Solution: choose the wear-resistance bush and assurance the quality; besides you also should keep good seal and lubricated to extend the work life of the suspension bearing.

3. Suspension bearing installed improper makes the screw locked or bending

Solution: Suspension bearing should be mounted concentric with the connecting shaft and insure that all suspension bearings concentricity to insure that wire helix of each segment.

There should leave some place between end and the screw shaft end usually is 10-20mm; Each suspension bearing halves should be connected firmly, tight, and it should be keep proper radial clearance to ensure screw flexible rotation.

4. Too many materials piled up in the inlet

Too many materials piled up in the inlet actually mean that the screw conveyor emerge blockage trouble. For strong bagging feature, humidity, large bulk material, especially under the case that can’t feed uniformly, this trouble is easily to happen.

Solution: You are not allowed to feeding materials that can’t meet the conveying request; feeding should be uniform; In order to avoid trough distortion you are not allowed to beat the charging port.

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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.

Maintenance of Screw Conveyor

1. Check operating status of screw conveyor components regular when in use, pay attention to fasteners. If any looseness of fasteners, tight screw at once.

2. When beginning feeding by screw conveyor, should increase the feeding speed gradually to reach the rated capacity. Feeding smooth, otherwise there may be blocking in transporting materials and overload of drive device which may cause premature damage of machine.

3. To ensure requirement of non-load start, no feeding before stopping screw conveyor, and it will stop after materials in casing are completely transported.

4. No large size materials to avoid the blocking and damage of screw conveyor.

5. Pay special attention to the screw between connection shaft. If any looseness, falling down or breakage, stop the machine at once and correct it.

6. Don’t remove the cover of screw conveyor when operating to avoid accidents.

7. Add lubricating oil regular for components of screw conveyor.

(1) Reducer should be added HQ-10 lubricating oil, and change oil 3-6 month once.

(2) Bearing boxes on both ends of conveyor should use 5g lithium base lubricating grease half a month once.

(3) Hanging bearing should use lubricating grease every 3-5 month once.

8. Check every abnormal phenomenon of screw conveyor and solve the problems.

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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.

2015年7月20日星期一

Screw Conveyor Of Henan Pingyuan Mining Machinery Co., Ltd

As for the material handing technology, the screw conveyor produced by our company has a wider application area. In order to solve the problem of large angle transmission materials, they not only focus on improve the appearance of the equipment but pay more attention to improve the structural design.

Structure design features of screw conveyor:

1.Large conveying capacity, efficient screw conveyor can conveying mass of materials in a smaller space, transportation capacity up to 6m^3/h--600m^3/h.

2. Low energy consumption, by means of internal friction of materials it. can pulling materials instead of push the materials forward, so that it can save 50% power compared with belt conveyor. Our suggestion is that the actual conveying capacity should not less than the minimum conveying capacity in the table 1 and also the 1.2 times of the actual conveying capacity should not greater than the maximum conveying capacity in the table.

3.Sealing and safety, Screw conveyors are totally enclosed so that dust can seamlessly drill, stable performance and reliable operation.

4.Long service life, screw conveyor layout flexible, can be elevated, ground or pit layout, horizontal or climbing (≤ 15 °)installation, and can be installed level and climbing on the same plane. Screw conveyors can have multiple inlet and discharge points. Bulk materials can be conveyed and distributed to various locations as required

5. Low-cost, saving power, durable, less maintenance,less cost (about one-tenth of the screw conveyor), it can ensure the normal work of mainframe, to increase output, reduce consumption and improve efficiency.

As the screw conveyor has different formsof design and manufacturing methods, so we can classify the screw conveyor such as tubular screw conveyor, trough screw conveyor, vertical screw conveyor and so on. Now we'll compare their advantages and disadvantages for your reference.

Screw conveyor can be designed to tubular screw feeder conveyor, trough screw conveyor, vertical screw conveyor according to the practical needs. In order to choose the right type of screw conveyor, we should consider the following factors: the actual use site, the characteristics, yield, etc.

(1) Body of tubular screw feeder is made of tubular, so that the conveying distance and the capacity of the screw conveyor is restricted. It apply to conveying little capacity and short distance materials.

(2) LS series of trough screw conveyor can be designed based on the conveying distance of the users, besides it has larger capacity and longer conveying distance compared with tubular screw feeder. But one disadvantage of LS seriesis that the screw conveyor conveying angle is generally not too large, mostly horizontal, or less than 15 °inclination angle, not suitable for large-angle material transport.

(3) Screw feeder can achieve material handling less than 90 degrees.

(4) The vertical screw conveyor is used for vertical transport of material, but the inlet is different from screw feeder. Vertical screw conveyors are used for vertical transport of materials, but vertical screw conveyors are usually fixed compared with the tubular screw feeders.

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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.

Why is there always happening blocking phenomenon for cement screw conveyor?

Cement screw conveyor always happens blocking phenomenon when conveying cement, which causes abnormal operation and the delaying for a project.

The blocking of screw conveyor is mainly caused by the following four aspects:

1. The power is too small, which cannot do high strength work normally.

2. The pitch between blade and blade is too small, so that when design, it is better to use gradual pitch to make it convenient of material feeding and discharging through widening the pitch between inlet and outlet.

3. The angle of elevation is too high. Generally speaking, 30 degree angle is the best.

4. The machine must be protected from water when in use. If water into inside of the machine, the cement will agglomeration. So must clean the machine regular to prevent blockages.

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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.

Safety Precaution of Cement Screw Conveyor

Safety must be considered a basic factor in machinery operation at all times. Most accidents are the result of carelessness or negligence. The following safety instructions are basic guidelines and should be considered as minimum provisions.

1. Conveyors and all other rotating and vibrating equipment shall not be operated unless all covers and/or guards for the equipment and drive unit are in place. If the equipment shall not be operated unless all covers and/or guards for the equipment and drive unit are in place. If the equipment is to be opened for inspection cleaning, maintenance or observation, the electric power to the motor driving the conveyor must be locked out and tagged out in such a manner that the equipment cannot be restarted by anyone; however remote from the area, until equipment cover or guards and drive guards have been properly replaced.

2. Feed openings for shovel, front loaders or other manual or mechanical equipment shall be constructed in such a way that the equipment opening is covered by a grating. If the nature of the material is such that a grating cannot be used, then the exposed section of the equipment is to be guarded by a railing or fence and there shall be a warning sign posted.

3. Do not attempt any maintenance or repairs of the equipment until power has been locked out and tagged out.

4. Control stored energy: Use safety blocks between dangerous parts that could move and injure. Always operate conveyor in accordance with these instructions and those contained on the caution labels affixed to the equipment.

5. Do not place hands or feet in the equipment.

6. Never walk on equipment covers, grating or guards.

7. Do not use equipment for any purpose other than that for which it was intended.

8. Do not poke or prod material into the equipment with a bar or stick inserted through the openings.

9. Keep area around equipment drive and control station free of debris and obstacles.

10. Always regulate the feeding of material into the unit at a uniform and continuous rate.

11. Do not attempt field modification of equipment or components.

12. Equipment is not normally manufactured or designed to handle materials that are hazardous to personnel. These materials which are hazardous include those that are explosive, flammable, toxic, or otherwise dangerous to personnel. Equipment may be designed to handle these materials. Equipment is not manufactured or designed to comply with local, state or federal codes for unfired pressure vessels.

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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.

Check List in Case of Screw Feeder Trouble

1.General questions Fault description

· Ask plant operator when and under which circumstances feeder stops. Does feeder start without problems after long periods of non-operation?

· Do weather conditions negatively influence feeder operation?

· If valve is fitted to feeder outlet check the center line of the valve shaft is parallel with the center line of the feeder, as would be fitted in normal circumstances.

2.Silo check

· Is the silo equipped with a deflecting or bridge breaking cone?

· Does silo include a fluidization system? If so how does it operate? Automatically at intervals while feeder is turned on? Manually for emergency in case of bridging?

· Is silo cone equipped with a vibrator or knocker? How does it work?

3.Electric equipment check

· Is a drop in voltage possible through the contemporary starting of various machines?

· Is the plant equipped with a generator?

· Check main supply of motor.

· Check electric motor is correctly wired and make sure wires are tightly fastened

· Check adjustment of thermal cutout in the control panel and compare with data on the motor plate.

· Check motor rotation.

· Read amperage with feeder running empty, then with filled feeder starting, as well as with full feeder running

· Check cross section of mains cables are suitable for the installed drive power.

4.Mechanical parts check

· Is breather plug of gear reducer functioning?

· Check outlet is free of crusts. Describe outlet (e.g. vertical or angular).

· Check weigh hopper vent is functioning correctly and check correct dimensioning of same.

5.Feeder check

· Are feeder parts correctly assembled? Do all inspection hatches point downwards?

· Does feeder bend? Stretch a string. If necessary additional supports must be fitted.

· Shut silo outlet valve. Empty feeder.

· Open inspection hatches. Check intermediate bearings are okay and correctly mounted.

· Turn feeder by hand using a spanner on the outlet end bearing shaft. If you don’t feel any resistance and don’t hear any grinding noise it is most certain that feeder is mechanically sound.

· Shut inspection hatches. Start feeder. Read amperage, voltage, cycles and screw r.p.m with empty feeder running. Compare ammeter reading with motor plate data.

· Repeat starting procedure with feeder at full load and read amperage, voltage and cycles.

6.Material check

· Material description

· Bulk density

· Particle size

· Humidity

· Flow ability (make material slide down a metal plate by varying the angle from low to steep)

· Compressive material

· Abrasive material

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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.

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