The Structure Principle and Maintenance Points of Screw Conveyor

 Spiral conveyor machine is a conveying equipment that uses the rotation of spiral blades to push bulk materials forward along the casing.

1. The structure of the screw conveyor

It is composed of a driving device, a casing, a cover plate, a screw shaft, a screw blade, a material inlet, a material outlet and other components.

1. Spiral blade: It can be divided into several forms such as full-blade type, belt-blade type, paddle type and tooth type.

Full-leaf type: Simple structure, strong conveying capacity, suitable for conveying dry granular or powdery materials with good scattering properties. It is the most widely used blade type.

Paddle type spiral blade: It has a strong mixing and stirring effect while completing the conveying operation. For example, it is used for round sieve for separating blades and kernel shells of the mixer of the rolling mill.

2. Casing: There are two types of "U" row casings and round casings. The circular casing is mainly used for the feed of sealing equipment. The screw auger of the round casing is also called the sealed screw auger.

3. Screw shaft: hollow, made of steel pipe, high strength, light weight, and easy to connect. Use a small section of solid shaft at the shaft-to-shaft connection and where the bearing is installed. Extend the solid shaft into the hollow shaft at the connection, and use high-strength bolts to pierce the hollow shaft and the solid shaft in a mutually perpendicular direction to fix the connecting screw shaft.

Second, the use characteristics of Screw Conveyor

Advantages: simple structure, low manufacturing cost, easy maintenance, good airtightness of the machine tank, multi-point feeding and multi-point unloading, one conveyor can convey materials in two directions at the same time, and it can also be used in the transportation process Processes such as mixing, stirring, loosening, heating and cooling of materials.

Disadvantages: During the conveying process, the friction between the material and the shell and the spiral body and the stirring and turning of the spiral body on the material cause the groove and the spiral blade to be easily worn, and at the same time, it has a certain crushing effect on the material, and the transmission power consumption is large. The screw conveyor is sensitive to overload and needs to feed evenly, otherwise it is prone to blockage. When the screw conveyor is inclined or vertically arranged, its conveying efficiency will be greatly reduced; the conveying length is limited.

Therefore, it is often used for horizontal and short distance transportation. The conveying length is generally less than 40m, and the vertical conveying height is generally no more than 8m; it is not suitable for conveying long-fiber-like, hard and bulky, easily bonded and easily broken materials.

3. Correct operation and maintenance of Screw Conveyor for cement

Screw conveyor is a general purpose conveying equipment used to convey powder, granular, and small block materials. Various bearings are working in dust. Therefore, the reasonable operation and maintenance of the screw conveyor under such working conditions are more effective. In a big sense, the main requirements for the operation and maintenance of the screw conveyor are as follows:

1. The screw conveyor should start without load, that is, start when there is no material in the shell, and start feeding the screw conveyor after starting. Before and after driving, you should always check whether the reducer is driving smoothly. If there is any abnormality, stop and check immediately and try to eliminate it. Check the condition of the screw cover and whether there are sediments or other debris in the screw. It is forbidden to drive when the screw is blocked.

2. During the initial feeding of the screw conveyor, the feeding speed should be gradually increased until the rated conveying capacity is reached, and the feeding should be uniform, otherwise it is easy to cause the congestion of the conveyed materials, the overload of the driving device, and the entire machine will be damaged early.

3. In order to ensure the no-load starting requirements of the screw conveyor, the conveyor should stop feeding before stopping, and stop running after the material in the casing is completely discharged.

4. Do not mix hard and bulky materials into the conveyed materials to avoid the screw jam and damage the screw machine.

5. In use, always check the working status of each part of the screw machine, pay attention to whether the fasteners are loose, if you find that the parts are loose, you should immediately tighten the screws to re-tighten them.

6. Special attention should be paid to whether the screws between the screw connection shafts are loose, dropped or cut. If such a phenomenon is found, stop immediately and correct it. If the blades are worn out, replace the spiral blades. If abnormal noise or high temperature is found when working, please stop and check.

7. The cover of the screw conveyor should not be removed when the machine is running. All personnel are prohibited from crossing the equipment during the operation of the screw conveyor, opening the cover, and not allowing human bodies or other sundries to enter the equipment. It is strictly forbidden to perform maintenance and overhaul operations while the equipment is in operation. When the equipment is overhauled, it is necessary to strictly implement the power-off, lock-out and tag-out regulations, and conduct two-way verification to avoid accidents. Screw conveyors are widely used in grain, food and oil processing enterprises, and many safety accidents have occurred, which should arouse the great attention of the employees of oil processing plants.

8. Regularly refuel the reducer; change the bearing oil regularly, and do a good job of daily maintenance.

Everything You Need to Know about Industrial Dust Removers

 Industrial Dust Collector is also known as Industrial vacuum cleaner. Industrial Dust Collector is an equipment used for Industrial use to collect and absorb waste media particles, Dust smoke, oil and water, etc. generated in production, operation and transportation. Industrial vacuum cleaners adopt AC power source, with large power. They are generally divided into mobile and fixed types.

Industrial dust collector is an equipment used for industrial use to collect and absorb waste medium particles, dust, smoke, oil and water produced during production, operation and transportation.

The main equipment used for separating dust particles in daily industry are gravity settling dust collector, inertial dust collector, electric dust collector, wet dust collector, filter dust collector and cyclone dust collector.

1. How it works

Industrial dust collector

Through the fan or air pump to make the machine internal air is drawn out, so the machine internal and external pressure difference, that is, the so-called negative pressure, the higher the negative pressure, the stronger the suction. Vacuum cleaner is actually very simple mechanical equipment, mainly composed of a vortex pump or fan convulsions, sundry after suction nozzle and vacuum tube into the machine, first enter a filter bag, generally is non-woven fabric, after primary filter, carry a small dust in the air through a special filter, again by the secondary filter, then through the fan discharge outlets, basically filtration efficiency can reach above 99%.

2. Classification and application scope

The Industrial dust collecting system has a large number of types and can be used separately or in a supporting manner. So the scope of application varies by category. When choosing to use a vacuum cleaner, also want to be optimistic about the type, according to the characteristics of dust removal to choose the appropriate type.

Industrial Dust Collector

3. Maintenance and maintenance editing

Check before use: open the barrel cover to check whether the dust bag is fastened, whether the suction nozzle is secured, and cover the barrel cover. Check the power voltage, if necessary, pay attention to the positive and negative rotation of the motor.

Replace the belt: some industrial vacuum cleaners with belt type transmission need to replace the new conveyor belt. Open the back door of the vacuum cleaner for replacement. If the belt is loose, open the side door and adjust the control nut to the proper position.

Notes during use: Common (non-explosion-proof) machines are strictly prohibited to be used in inflammable and explosive places; Non-special material filter bag shall not absorb burning fire and ultra-high temperature waste. It is strictly prohibited to use in the absence of dust bag or filter, otherwise it will directly cause damage to the fan; When the filter bag and filter are damaged, they should be replaced in time and cannot be used any more. The suction hose shall not be crushed, trampled or worn; The temperature in the shell of the rear box is high, especially after working for a long time, pay attention to scald; Too much debris should be cleaned in the dust bucket timely and filter bags and filters should be cleaned regularly to ensure smooth operation; When the vacuum cleaner is overloaded, the thermal relay in the control box will automatically cut off the power supply. At this time, the power plug must be unplugged to find out the cause. After the thermal relay is reset, it will be used in line. After the work is finished, the power should be cut off and placed in a cool and dry place. This can effectively extend the service life of the industrial dust collector.

4. Troubleshooting editor

Large noise - Causes: serious bearing wear, shaft bending, blade shaft deformation or displacement, loose fasteners, motor wear (brush, rotor, bearing, etc.), fan blade loose or damaged, etc.

Motor overheat - Causes: continuous working time is too long, too much spark is generated due to wear of brush and commutes, too much ash is stuck on the filter, dust collecting room is full of ash, etc.

Drop in suction -- Causes: motor failure, brush wear, dust filter dampened, dust collecting room full, hose and dust inlet or exhaust outlet blocked, pipeline leakage, poor interface seal, etc.

Fuse (pipe) connection fuses -- Causes: short circuit in power cord, plug, seat, motor coil, and vacuum cleaner internal connection.

Case is electrified -- Cause: the power cord is aging, so there is leakage to the ground, and the internal circuit of the vacuum cleaner comes into contact with the case.

We are Industrial Dust Collector Exporter, and if you are interested in our products, please feel free to contact us.

Classification of Screw Conveyors

 Screw conveyor, commonly known as auger, is a widely used conveying equipment in the mineral, feed, grain and oil, and construction industries. It is used to convey high temperature powder or solid particles and other chemical and building materials products.

The screw conveyor uses the rotating screw blades to push the material for conveying by the screw conveyor. The force that the material does not rotate with the screw conveyor blades is the material's own weight and the frictional resistance of the screw conveyor casing to the material. The spiral blades welded on the rotating shaft of the screw conveyor have solid surface, belt surface, blade surface and other types according to the different materials to be conveyed. The screw shaft of the screw conveyor has a thrust bearing at the end of the material movement direction to give the axial reaction force of the screw with the material. When the length of the machine is long, an intermediate suspension bearing should be added.

2: Classification of screw conveyors

The screw conveyor is divided into two types: horizontal screw conveyor and vertical screw conveyor.

Screw conveyors can be divided into horizontal screw conveyors, vertical screw conveyors, bendable screw conveyors, and spiral tube (roller conveyor) conveyors according to the characteristics and structure of the conveyed materials.

(1) Vertical screw conveyor

The speed of the spiral body of the vertical screw conveyor is higher than that of the ordinary screw conveyor. The added material generates friction with the casing under the action of centrifugal force, which prevents the material from rotating with the screw blades and overcomes the material drop The gravity, so as to realize the vertical transportation of materials. The machine has a small conveying volume, a small conveying height, a high speed, and a large energy consumption. It is especially suitable for conveying powdery and granular materials with good fluidity, mainly used for lifting materials, and the lifting height is generally not more than 8 meters.

(2) Horizontal screw conveyor

When the material is added to the fixed tank, due to the gravity of the material and the friction between the material and the tank, the material accumulated in the lower part of the tank does not rotate with the spiral body, but only moves forward under the push of the rotating spiral blade, like The non-rotating nut moves in translation along the rotating screw to achieve the purpose of conveying materials. The machine is convenient for loading and unloading at multiple points, and can complete mixing, stirring or cooling functions at the same time during the conveying process. Sensitive to overload, easy to block; material is broken and lost, the structure of the horizontal screw conveyor is simple, easy to install, maintain and troubleshoot. It is suitable for horizontal or slightly inclined (below 20º) continuous and uniform conveying of loose materials. The working environment temperature is -20—+40℃, and the conveying material temperature is -20—+80℃. Its speed is lower than that of a vertical conveyor, and it is mainly used for conveying materials horizontally or at a small angle. The conveying distance is generally not more than 70 meters.

Screw Conveyor

(3) Spiral tube (roller conveyor) conveyor

Spiral conveyor machine is a cylindrical casing welded with continuous spiral blades, and the casing rotates with the spiral blades. Due to the centrifugal force and friction, the added material rotates and is lifted by the shell together, and then slides down the spiral surface under the gravity of the material, so that the material rotates with the spiral tube to realize the forward movement of the material, as if not rotating The screw moves in translation along the rotating nut to achieve the purpose of conveying materials.

The machine has low energy consumption and low maintenance costs; when feeding at the end, it can meet the requirements of uneven feeding, and can complete various process requirements such as conveying, stirring and mixing at the same time. When the material enters too much, it will not cause jamming; it is convenient for more Point loading and unloading can transport materials with higher temperature. It is suitable for horizontal conveying of high-temperature materials; it has good adaptability to materials with high temperature, uneven feeding, anti-fragmentation requirements, anti-pollution requirements, and processes that require multiple points of loading and unloading. Practice has proved that it is effective in conveying materials such as cement clinker, dry limestone, phosphate rock, ilmenite powder, coal and slag.

The particle size of the material added from the end feed port should not be greater than 1/4 of the spiral diameter; the particle size of the material fed from the middle feed port should not be greater than 30 mm. To ensure that the cylinder does not deform, the feeding temperature must be controlled below 300°C. The machine wears extremely severe blades and troughs when conveying abrasive materials. The screw conveyor designed this time is mainly used for conveying silicon powder, which is very abrasive, so it is not suitable to use the screw conveyor.

(4) Flexible screw conveyor

The spiral mandrel of the machine is flexible, so the transmission line can be arranged according to the space curve according to the needs. According to the different length ratios of the horizontal and vertical (large inclination) sections in the layout, the working principle is designed according to the ordinary screw conveyor or the vertical screw conveyor. It is used in the occasions where the conveying line needs to be arranged randomly according to the space curve to avoid material reloading; when too much material or hard material enters the casing, the spiral body will float freely without jamming; the noise is low. Mainly used to complete the horizontal and vertical transportation of materials at the same time. In vertical conveying, the speed is generally required to be higher than 1000r/min.

 

What Is the Difference Between a Screw Conveyor and a Case Elevator?

 Screw conveyors and box elevators have some key functions in common, but there are many functions that separate the two vertical conveyors.

Let's explore the difference between screw conveyor and box elevator. But first, let us define what screw conveyors and box elevators are and describe their uses.

What is a spiral conveyor machine?

Screw conveyors have a wide range of names, including belt inclined conveyors, screw lifts, vertical conveyors, vertical lifts, spiral curves, spirals and even screw conveyors, which is a special brand name.

Screw conveyor is a broad term used to describe two types of material handling conveyor equipment, each of which belongs to a separate material handling category and can meet different industrial markets. One type of screw conveyor is a bulk material conveying screw conveyor, and the other is a belt or slat conveyor.

The bulk material conveying screw conveyor uses a closed screw screw to vertically move loose bulk particles and powders. Belt or slat conveyors use belts or slats to vertically move packed or unpackaged boxes, packages, parcels, pallets, totes and other items.

Both screw conveyors transport products vertically rather than horizontally. Each type of screw conveyor is suitable for better serving certain industries. Among them, the screw conveyor is especially valued by the agriculture, chemical processing, consumer goods and food processing industries, while the belt or slat conveyor is mainly used for packaging and Assembly, package handling and general manufacturing.

Box elevator, also called box elevator, is a machine that can lift boxes, cartons and other packages vertically. With the help of the box elevator, the box enters the machine through the conveyor belt, and the double scraper rises vertically to lift the box from the feeding conveyor belt and move it to the discharge height.

Like screw conveyors, box lifts take up the least floor space. Although it is a functional machine, the design of the box lift is outdated and its throughput capacity is very limited. They often suffer rapid wear and tear, which can stop operation and require time-consuming maintenance and repair time.

Screw Conveyors

What is the difference between a screw conveyor and a case elevator?

Screw conveyors and boxes lift each transported product vertically instead of horizontally. However, the screw conveyor has a leading and forward-looking design. This improved design enables screw conveyors to move loads faster and more reliably than box elevators.

Screw conveyors provide continuous material flow. The load does not need to be synchronized to

Increase flights, increase throughput and eliminate bottlenecks.

Another advantage of screw conveyors is that they require significantly less maintenance compared to box elevators. In terms of increasing uptime, this can save companies a lot of money and time.