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. 

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.

Daily Maintenance for Screw Conveyor

Screw conveyor is bulk material handling equipment, which usually consists of a tube containing either a spiral blade coiled around a shaft (sometimes called an auger), driven at one end and held at the other, it is widely used in chemical, metallurgy, paper making, and construction industries, etc. Below you will see its daily maintenance methods:

1. When operate the screw conveyor, bearings, gears and transmission chain should be added lubricating oil regularly.
2. After machine stops, the spiral blade wear condition should be checked, if wears seriously, please repair welding.

3. The conveying capacity can not be overloaded, or the material can’t be discharged which will cause the screw axis bends and box damages.
4.During the operation of screw conveyor, any shrill noise, please open the cover and check, eliminate the noise timely.
Hope above mentioned maintenance will be helpful!

What is Closed Pipe-type Screw Conveyor?

The closed pipe-type screw conveyor is a pipe with a shaft inside with welded screw blades and passive bearing. The screw’s blades have different pitch which depends on the type of the transported raw material and the planned capacity. This type of conveyor is closed, which means that the screw cannot be accessed directly. Due to the closed structure, the transported raw material does not spill outside the machine during transport. 

The machine can be equipped with a pull screw. In this version, the drive unit is located in the direction of the raw material feeding. Some screw conveyors are equipped with push screws with gear motor installed on the feeding side. The screw conveyor is fitted with an initial or end bearing. Depending on the type of transported raw material, slide or bearing rests are installed. 

 -------------------------------------------------------------------------

Henan Pingyuan Mining Machinery Co., Ltd is the most professional manufacturer of Belt conveyor, andVibrating 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 selection of layout and features of the common screw conveyor

 Screw conveyors are commonly used:

 LS type screw conveyor, GX type screw conveyor etc..

Screw conveyor application scope and characteristics:

(1)A screw conveyor conveying equipment widely used in chemical industry, building materials, food and other departments in the industry. Mainly used for conveying powdery, granular and small shape material. It is not suitable for transporting metamorphic, viscosity, easy to agglomerate material.

(2)Operating temperature-20~50℃; material temperature is less than 200 ℃; conveyor length is less than40m, is no more than 70m.

(3)Compared to screw conveyors and other conveyor equipment and has a simple structure, small cross-sectional dimensions, good sealing performance, you can add more loading and unloading, safe and convenient operation and low manufacturing cost advantages. It has the disadvantage of mechanical wear and tear is more serious and low throughput, high power consumption and the material easily crashed during transport.

Classification and selection of screw conveyor:

(1)There is an entity type screw blade of the screw conveyor, belt surface pattern of spiral surface and blade three.Entity spiral surface become law, 0.8 times the pitch GX type blade diameter, suitable for powdered, granular material transport. D screw surface preparation method, with helical blades of the same pitch diameter, suitable for conveying powder and scrap materials. Spiral blade less, mainly used for conveying viscosity and accessibility of the material, in the transmission process, complete mixing, the mixing process, the spiral blade diameter of a pitch about 1.2 times the times.

(2)There are two Calvinistic and dextrose rotation to the screw blade.

(3)Types of screw conveyor is horizontally fixed screw conveyor, vertical conveyor. Horizontal fixed screw conveyances a type of the most commonly used. Vertical screw conveyor for short distance promotion materials, the conveying height is generally not more than 8 meters, the spiral blade for spiral surface entity, it must use horizon spiral feeding, so as to ensure the necessary feed pressure.

(4)LS, GX type screw conveyor material outlet end, should set the 1/2~1 ring reverse spiral sheet, prevent powdery material plugging end bearing. Above the exit tube spiral piece.

(5)Screw conveyor by the screw machine body, a material inlet and outlet and a driving device of three parts. Screw conveyor bearings, bearing body by the head, tail suspension bearing, spiral, casing, cover and base etc.. The driving device consists of motor, reducer, coupling, base.

(6)Selected according to material characteristics. For powder, granules and small block materials as horizon or inclined conveyor angle ≤ 20 °, optional common screw conveyors, of bulk, heat and equilaterals can choose single pipe (Spiral pipe) screw conveyor, when powdered or fine granular material vertical lifting, the choice of vertical screw conveyor.

(7)Common screw conveyor for conveying explosive, flammable, toxic or corrosive materials. When necessary and manufacturers of negotiation, using special security measures.

(8)The edible material conveying stringent requirements (such as glucose), screw conveyor, spiral casing body, a bearing seat and other material contact parts made of stainless steel, copper, need other materials. The internal can not add the lubricating oil, therefore, must use the powder metallurgical bearings, and have godliness measures, in order to prevent the pollution to the food.

(9)Because the casing screw conveyor is installed, so the larger difference area at ambient temperature, convey material high temperature, long conveying distance, measures must be taken to prevent the casing to temperature changes, the expansion and the damage of equipment. The general case can add asbestos pad thick in the casing flange, to adjust the telescopic casing, or the casing floating support on the base, make the case in the base so as to adjust the telescopic slide freely.

(10)Single screw conveyor drive device can not be used to drive a screw shaft triangular belt or chain drive, in order to avoid the shaft end in the radial force, produce cantilever load, making the whole body from the tug.

(11)Because of the spiral conveyor is very sensitive to overload, so when the design in the hopper (or bins) lower,the feed volume shoddily not be control, may be overloaded and material clogging phenomenon, even damage the drive device, therefore it must be in the spiral convener feed inlet arranged leaf wheel feeder are rigid and feeding device, to ensure the safe operation of the screw conveyor.

(12)When the spiral convener feed, have a certain pressure on the shell, which can make the dust from the inlet overflight, the pollution of the environment, in this case, the feed inlet is required to take pressure and dust measures, or arranged at the flashing valve electric device in the feed inlet, to prevent dust leakage guarantee environment from pollution.

Layout of the form of screw conveyor:

(1)Various driving device:

1)Driving device adopts a motor, reducer combination, which is divided into right and left installed installed two forms.

2)Uses of v-belt transmission for motor, shaft mounted reducer drive unit.

3)The assembly adopts the form of gear motor direct drive.

4)Layout of driving device of vertical screw conveyor.

(2)Screw conveyor arranged in a horizontal installation, if conditions allow the best driving device is arranged on the discharging end position, because the driving device and a material outlet arranged in the coleus (with a thrust bearing) when more reasonable, can make the spiral tube shaft is in tension. In addition, each discretion (section, the middle section, the tail section) arrangement order best follow the spiral section length the size are arranged in order and the spiral section of the same together with the principle, it will bring much convenience to the design, manufacturing and order.

(3)In general layout should also be careful not to make the support base or when discharge port arrange a casing joint flange, inlet should not be arranged in the canopy above the joints and suspension.

 

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. 

    -------------------------------------------------------------------------

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 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.

The Reasons Why Screw shaft of Screw Conveyors Stops Rotating

Generally, if screw shaft of screw conveyors stops rotating, it mainly caused by the following three reasons:

1. The size of conveying material is too big and can't pass through the intermediate bearing, material resistance here is too big which will lead to motor overload and stop operation. Then you must clean up the material inside the screw conveyors .
2. The place of intermediate bearing resistance is large, sealing damages. Material will go into the bearing which will lead to bearing stops rotation or bearing damages.

3. Bearing of gear motor burns out.
If the reducer bearing temperature rises too fast after start-up and along with abnormal noise and reducer vibration, at this time, you should stop the machine quickly and the reason may be caused by the following aspects:
1) If the reducer output shaft bearing temperature is high ,but input shaft bearing temperature is normal. This is because the screw shaft centerline offsets or reducer output shaft bearing damages, or head and tail bearing loosens. Here you need to loosen the coupling between reducer output shaft screw shaft, correct and install.
2) If the bearing temperature of reducer output shaft is normal, but input shaft temperature is high. This is because the motor fixed components loosen or reducer output shaft bearing damages, you need to loosen the coupling between reducer input shaft and the motor, correct and install.
3) If both of reducer output and input bearing temperature are too high. This is due to the loosening of fixed bolts on reducer or both ends of reducer bearing burn out, here you need to loosen the coupling on both sides of reducer ,correct and install.

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.   

Selection condition of the Screw Conveyor

Primary considerations for the selection of a screw conveyor are as follow:

1. Type and condition of the materials to be handled, including maximum particle size, and, if available, the specific bulk density of the material to be conveyed.

2. Quantity of transported material, expressed in pounds or tons per hour.

3. The distance for which the material is to be conveyed.

Below is the necessary information for the selection of a screw conveyor system, presented in a series of five steps. These steps are arranged in logical order, and are pided into separate sections for simplicity. The five steps are:

1. Establishing the characteristics of the material to be conveyed.

2. Locating conveyor capacity (conveyor size and speed) on capacity tables.

3. Selection of conveyor components.

4. Calculation of required horsepower.

5. Checking of components torque capacities (including selection of shaft types and sizes)

For more information, pls do not hesitate to contact us via : 

Web:http:www.pkmachinery.com

Mobilephoe:+86 18338953783

Tel: +86 373 579 9198

Fax: +86 373 507 1699

Address: 289 Yellow River Road, Xinxiang City, Henan Province, China

typical hazard and safeguarding methods of screw conveyor

Screw Conveyors

Hazards:

Screw conveyors are troughs with a revolving shaft with a spiral or twisted plate. In-going nip points for the entire length of the screw conveyor exist between the revolving shaft and trough. Because the trough may be covered and the conveyor may be located at or near floor level, screw conveyors can be particularly dangerous. 

Hazards Controls:

Screw conveyor housing must completely enclose moving elements (screw mechanism and power transmission apparatus), except for loading and discharge points. Permanent affixed grids or polycarbonate can be installed for visibility purposes to allow the operator to monitor the operation. Besides, trough side walls should be higher to prevent workers from reaching into or falling into the trough. If it is an open troughs, workers must be protected by secondary safeguarding methods such as railing or fence. Feeding loading and discharge points can be guarded by enclosures, screening, grating, or some other interruption across the openings which allow the passage of materials but do not allow entry of the body. 

 -------------------------------------------------------------------------

Henan Pingyuan Mining Machinery Co., Ltd is the most professional manufacturer of Belt conveyor, andVibrating 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.

For more information, pls do not hesitate to contact us via : 

Web:http:www.pkmachinery.com

Mobilephoe:+86 18338953783

Tel: +86 373 579 9198

Fax: +86 373 507 1699

Address: 289 Yellow River Road, Xinxiang City, Henan Province, China

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.

For more information, pls do not hesitate to contact us via : 

Web:http:www.pkmachinery.com

Mobilephoe:+86 18338953783

Tel: +86 373 579 9198

Fax: +86 373 507 1699

Address: 289 Yellow River Road, Xinxiang City, Henan Province, China

Introduction of screw conveyor

Henan pingyuan mining machinery Co., Ltd provides three types of screw conveyor which are U - type screw conveyor, pipe screw conveyor and cement screw conveyor.

U- type Screw conveyor

A screw conveyor is one of the most versatile and cost effective mechanical conveyors for handling dry bulk solids such as flakes, grains, powders, seeds and granules. The conveyor provides enclosed transfer while moving materials-horizontally, vertically or at an incline and can deliver materials from one or more inlet points to one or more discharge points. It usually consist of a trough or tube containing either a spiral blade coiled around a shaft, driven at one end and held at the other, or a "shaftless spiral", driven at one end and free at the other. Screw conveyors can be operated with the flow of material inclined upward. When space allows, this is a very economical method of elevating and conveying. As the angle of inclination increases, the capacity of a given unit rapidly decreases.

Pipe screw conveyor

GX tubular screw conveyor is bulk material handling equipment, which usually consists of a tube containing either a spiral blade coiled around a shaft (sometimes called an auger), driven at one end and held at the other. The  main parts include tube, shaft with spiral blades, inlet and outlet chutes, as well as driving device. 

The closed pipe-type screw  conveyor  is a pipe  with a  shaft  inside  with welded  screw blades  and  passive  bearing.The screw’s  blades  have different  pitch which depends  on the type of the  transported  raw  material  and the planned capacity. This  type of conveyor  is closed, which  means that the  screw cannot  be accessed  directly. Due to the closed  structure,  the transported  raw material does not  spill outside the machine during  transport.

The machine can be equipped with a pull screw. In this version, the drive unit is located in the direction of the raw material feeding. Some screw conveyors are equipped with push screws with gear motor installed on the feeding side. The screw conveyor is fitted with an initial or end bearing. Depending on the type of transported raw  material, slide or bearing rests are installed.

Horizontal screw conveyor has the advantages of sealed operation, simple structure. screw conveyor suitable for conveying powdery, granular and small bulk materials horizontally or aslope, such as coal, ash, slag, cement,  food, etc. screw conveyor is an new transportation equipment

Cement Screw Conveyor

Cement screw conveyor is bulk material handling equipment, which usually consists of a tube containing either a spiral blade coiled around a shaft (sometimes called an auger), driven at one end and held at the other. The main parts include tube, shaft with spiral blades, inlet and outlet chutes, as well as driving device.

For more information, pls do not hesitate to contact us via : 

Web:http:www.pkmachinery.com

Mobilephoe:+86 18338953783

Tel: +86 373 579 9198

Fax: +86 373 507 1699

Address: 289 Yellow River Road, Xinxiang City, Henan Province, China