Shaftless screw conveyors are ideal for bulk materials with high moisture content that have a tendency to adhere to the center pipe of a conventional shafted screw conveyor. Innovative design features of the shaftless spiral allow a screw conveyor to provide higher throughput rates and low speeds and offer a resistance to conveying materials that would tend to stick or tangle with a shafted spiral. Using the latest in materials and manufacturing technology, hundreds of jms bio screw screw conveyor system conveyors are still in operation. Reliable operation with no end or intermediate bearings.
Pdf design of screw feeding system with shaft less fights. One of the main reason to use a shaftless conveyor is the ability to handle different type of material. There are several applications for material handling equipment in the wastewater industry. At screw conveyor corporation we stand behind everything we specify, manufacture and sellfrom complete customized bulk material handling equipment to replacement parts.
All dimensions and tolerances are based on carbon steel fabrication. Shaftless screw conveyors are suitable to transport clogging materials, such as sludges or screenings, which otherwise would tend to stick to the shaft of the screw. Guide index download guide pdf horizontal screw conveyors inclined screw conveyors shaftless screw conveyors vertical screw conveyors horizontal screw conveyors horizontal screw conveyors are the most widely used type of screw conveyor. Since 1978, our screw conveyor systems have been installed in many of the largest and most complex dewatered sludge cake applications in north america. Publications cema conveyor equipment manufacturers.
Screw conveyors for the abovementioned materials are of the type utough and shaftless screw spiral. Shaftless screws are available from 6 to 24 diameters in single flight and 9 to 24 diameter in double flight configurations. Typical costs of material handling equipment components jms. Kws designs and manufactures kws shaftless screw conveyors. Screw conveyor 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. Lower capital cost and lower overall maintenance are realized from equipment designed to require fewer parts. The transport of sticky materials, like muds, requires a selfcleaning solution as the shaftless screw conveyors. These are cylindrical tanks with conical bottoms used for free flowing dried sludge with bin activators and air locks or live bottom screws for dewatered sludge. Shaftless spiral conveyors eliminate the central shaft and allow a much higher fill rate resulting in lower rpms, more efficient conveying and consequently less wear. Due to the absence of intermediate bearings, obstaclefree material handling is guaranteed.
Bulk handling equipment screw conveyor corporation. When the screw conveyor is working, the motor drives the rotating spiral blade to transport the material, so that the material moves in the direction of the outlet, and then. Conclusion on shafted screw conveyors vs shaftless screw conveyors. Without a shaft, no intermediate or end bearings are required. The first type of screw conveyor was the archimedes screw, used since ancient times to pump irrigation water. Applications and materials transported by shaftless spiral conveyor from spirac. Martin offers a variety of configurations to efficiently handle most any material. Endtoend and side connections not possible on shafted screw conveyors are common solutions available in the shaftless design. For many facilities, space is at a premium, which is why the shaftless spiral conveyor is. Engineered shaftless screw conveyors usssc wamgroup. Shaftless screw conveyor calculations engineering guide. Shaftless screw conveyors shown without cover for illustration uroses only. The latter being the only option if the screw conveyor requires flights of hardox plate. Better performance is achieved through zeroclearance between the trough and spiral.
Shaftless spiral the shaftless spiral allows higher filling rates and lower rpms resulting in less wear and consequently less maintenance and down time. Take a look at our case studies section to know more about how we used those products to solve their problems. Conventional screw feeder or screw conveyor idea is taken with its. For example, our unique shaftless vertical screw conveyor design is used in many wastewater treatment facilities for elevating dewatered biosolids. It eliminates hanger bearings and end bearings to reduce maintenance and increase efficiency enabling direct transfer to another conveyor. To enable complete transport solutions, both vertical and horizontal versions of the screw conveyor are available. Pneumatic shafted screw custom conveyor corp continuously invests in the equipment and skilled staff for quality, product improvement and growth. Kws shaftless screw conveyors are designed to handle almost any bulk material, from dry and free flowing to sticky and sluggish. Shaftless screw conveyors can convey stingy, sticky, wet, and lumpy materials.
Shaftless spiral conveyors spirac solid handling solutions. Shaftless spiral conveyors ssc worm on pipe,worm feeder,worm. The trough liner is the spirals replaceable bearing surface. A wide variety of shaftless screw conveyor options are available to you, such as material feature, structure, and material. Usually, they are produced from shaftless spirals, however, they can also be produced from welded flights. Martin can help size and select the conveyor that meets your needs. Shaftless screw conveyors from lackeby products are developed and designed for ef. Shaftless screw conveyer material handling solutions. Construction the conveyor body can be constructed of 304 or 316 stainless steel. Several conveyor sections can be connected in series, up to a total transport length of 80m. Martin offers a complete line of material handling solutions available to the marketplace. The ssc shaftless screw conveyor is an alternative concept to the traditional shafted screw conveyor.
Hi, i am interested in designing up a series of shaftless screw conveyors to convey after centrifuge 25% dry solids wastewater sludge and would like to know where to find the necessary calculations for power requirements etc. The shaftless screw conveyor is the ideal solution to convey and meter the sludge or bulk materials coming out of centrifuges, presses and mixers. The shaftless screw conveyors and components shall be designed and constructed in accordance with the conveyor equipment manufacturers association cema standard no. Spirac shaftless screw conveyors with horizontal, inclined and vertical orientation with no intermediate or end bearings, low rpm and low power usage is a spacesaving, extremely reliable conveying option. This product works well when moving sticky products and large sized lumps. Shaftless screw conveyor manufacturer bulk material. With her beautiful curves, controlled and disciplined gait and the smooth delivery. Scl designs and supplies vertical screw conveyors to meet the needs of many industries, such as chemical, minerals processing, food, wood products and wastewater treatment. Kws shaftless screw conveyors efficiently convey dry, semifluid or sticky materials. This allows for direct connections and optimizes layout design flexibility.
Both designs have their pros and cons, and the final choice typically comes down to what material the screw conveyor conveying, and owner preference. Kws shaftless screw conveyors are a wise investment. Shaftless screw conveyors from lackeby products are developed and designed for efficient transport and minimal maintenance. The working range of the conveyor is typically between 0 and 30, with decreasing efficiency proportional to the increasing inclination. Download a copy of the orthman screw conveyor catalog link to pdf or the. These recommended substandards are issued in conjunction with cema standard no. Custom conveyors shafted screw conveyors efficiently convey dry to semifluid and free flowing to sluggish materials. Shafted screw conveyors date to archimedes and are still one of the most widely used and simplest devices for the movement of material. Since our ssc shaftless spiral conveyors do not require end bearings this allows for direct connections and optimizes layout design flexibility. Shaftless screw conveyors designed to transport materials which are sticky, slushy, stringy and plug forming, irregular and archforming.
Pdf screw conveyor engineering guide pt lunga mkafane. Our conveyor products are designed to efficiently handle most varieties of dry, free flowing bulk materials. Material is conveyed by an extraheavyduty shaftless screw that slides on a wearresistant liner inside. Cemc offers a variety of products and services ranging from stock components and stainless steel screw conveyors to fea analysis and repairs. Screw conveyors is a comprehensive manual of engineering and.
Please follow manufacturing safety guidelines when oerating conveyors. The ssc shaftless screw or spiral conveyor is an alternative concept to the traditional shafted screw conveyor. Schrage rohrkettensystem gmbh conveying systems 83,339 views. The only connection point in a shaftless screw conveyor is at the drive end of the screw conveyor. Shaftless screw conveyor engineering guide kws shaftless screw conveyors are highly efficient at metering and conveying a variety of bulk materials.
Shaftless screw conveyor engineering guide bulk material. If conducted, it would be the most sought out title in the conveyor world. Material handling screw conveyors and bucket elevators. Stainless shaftless screw conveyors shaftless vertical. Whether the application is conveyance or storage of dewatered biosolids, sludge, screenings or grit, it is important to consider such factors as volume, solids, density, of the substrate when choosing the right equipment for the job. The shaftless flighting often lies inside of a trough and is. Used to convey bulk materials from one part of a process to another, horizontal screw conveyors are. Function the shaftless spiral makes a screw conveyor particularly suitable for materials. Inclined and vertical shaftless conveyors also tend to have greater deflection when compared to horizontal shaftless screw conveyors of the same length. Shafted screw conveyors are compact and easily adapted to congested layouts. Ideal for conveying dry to semifluid bulk materials free flowing to sluggish. We offer many proprietary conveyor components including radius formed trough tooling, cema tolerances, and the worlds highest quality spirals. Shaftless screw conveyor product description shaftless screw conveyors are ideal for moving sticky andor stringy materials that otherwise tend to build up on a standard screw s pipe or wrap around it.
A continuous flight directly supported by the casing is the common application. The model tf shaftless screw conveyor is utilized for the transport of screenings, grit or sludge in municipal and industrial wastewater treatment applications. The cylindrical shape is the most economical per volume to manufacture. The shaftless design provides a nonclogging conveying surface by eliminating. Screw conveyors are a standard go to in wastewater treatment plants in both shafted and shaftless forms. Due to the absence of intermediate bearings, obstaclefree material handling is. Ssc shaftless screw or spiral conveyors are an alternative concept to traditional shafted screw conveyors. Every kws shaftless screw conveyor is designed for long life and minimal downtime using the calculations described above. The ssc shaftless screw or spiral conveyor is an alternative concept to the. You can also choose from conveyor system, inclining conveyor, and roller conveyor shaftless screw conveyors, as well as from stainless steel, carbon steel, and plastic shaftless screw conveyors there are 1,357 suppliers who sells shaftless screw conveyors on, mainly located in asia.
It can now replace the traditional shafted screw conveyor in most applications. Shaftless flight is heavier gauge helicoid flight that is produced to outside diameter and pitch specifications with an open center. The shaftless screw conveyor also known as a ribbon screw conveyor is an improvement to the typical screw design, as it allows material to flow through the auger as well as around it. Typical costs of material handling equipment components. With spirac solids handling solutions, you can have total confidence in a global leader. Shaftless screw conveyor engineering guide located on our website. At mlm, we have the expertise and experience to provide a total system solution for all your sludge transport and handling needs utilizing some of the worlds most reliable mlspaans bhs shafted screw conveyors and ml shaftless screw conveyors, and integrating. Contact north americas top screw conveyor company today. Shaftless screw conveyor spirac jci industries inc.
Features and benefits low rpm for long life expectancy from minimal wear of components virtually maintenance free. Shafted screw conveyers material handling solutions. Martins shaftless screw eliminates jamming and buildup typical in shafted screw conveyors for greater uptime, higher efficiency, and lower maintenance. Shaftless screw conveyor design standards engineering guide. The only machined bearings in a shaftless are in the gear reducer. Martins shaftless screw eliminates jamming and buildup typical in shaftedscrew conveyors for greater uptime, higher efficiency, and lower maintenance. Shaftless screw conveyors kws shaftless screw conveyors are a wise investment. Flexible screw conveyor or flexible screws by formpak. The ssc shaftless spiral conveyor has provided efficient and reliable transport of various difficult to transport materials for decades. Shaftless screw conveyors consists of a screw, without internal shaft, driven by a power transmission, rotating inside a trough carrying material loaded through one or more hoppers, to one or more exhaust ports, possibly equipped with shutoff sliding valve.
Shaftless screw conveyors are the ideal solution for hardtotransport materials ranging from irregularly shaped. Motridal is able to provide this type of conveyor with any size and length technically feasible. Ssc shaftless spiral screw conveyors offer large volume capacity and the possibility of handling particularly difficult. Feb 20, 2015 screw conveyors for the abovementioned materials are of the type utough and shaftless screw spiral. The shaftless screw is available in highstrength alloy steel or stainless steel. Single and double screw conveyors are commonly used to transfer bulk material solids. A conveyor screw is either right hand or left hand depending on the form of the helix. We have it onsite at rubyanna wwtp, recommend them for any plants for the future or even retrofitting. Maintenance is significantly reduced when compared to traditional conveying methods. Bulk materials discharged from centrifuges, filter presses or mixers can easily be metered or conveyed using a shaftless screw conveyor. Screw conveyor dimensional not for distribution standards. Kws shaftless screw conveyors are successfully used throughout the chemical, food, minerals processing and wastewater treatment industries for conveying everything from catalysts to dewatered biosolids kws developed the industry standards for shaftless screw conveyors and continues to create new and improved design standards.
For vertical transport applications we supply screw conveyors with a tube casing. Shafted screw conveyors vs shaftless screw conveyors jms. Endtoend and side connections not possible on shafted screw conveyors are common solutions available in our shaftless design. Applications and materials transported by shaftless spiral. This is the first part of a paper that describes some of the necessary knowledge for the design and application of the horizontal and slightly inclined shaftless screw conveyors hsscs, and. Jms can design shafted screw conveyors or shaftless screw conveyors in multiple configurations to meet the needs of your process, and provide heat tracing and insulation if desired. When designing a shaftless screw for use in various types of equipment i. Shaftless screw conveyors are often used by atara equipment to solve some of the difficulties our customers may be encountering. However, a screw may also be used to heat or cool a product as it is being conveyed. They 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. This may seem like a small change, but it makes a huge difference in practice as it increases the efficiency, flexibility, complexity, and range of.
Spiracs horizontal, inclined and vertical shaftless spiral conveyors with no intermediate or end bearings, low rpms and low power usage are an extremely reliable conveying option. Although the spirals can be made out of many different materials, the primary material is a special steel from sweden which has mechanical properties that give the. Our shaftless design provides a nonclogging conveying surface that allows difficulttoconvey materials to become easytoconvey. We provide a full line of conveyance systems for maximum flexibility and performance. The 2015 edition, the screw conveyor section revised and modified substandards 300001 18inch dimensions were added to the table, 300020 cema 216 hanger bearings dimensions and tolerances were added, 300021 cema 226 hanger bearings dimensions and tolerances. Screw conveyors shall comply with ansiasme safety standards b15. Ssc shaftless screw spiral conveyors have been specially designed for handling of difficult heterogeneous materials like urban solid waste, screenings and floating matter, dewatered, thickened, conditioned sludge, packaged food, waste from. Kws designs and manufactures shaftless screw conveyors to meet the needs of many industries, such as chemical, rendering, wood products and wastewater treatment. About 72% of these are conveyors, 7% are material handling equipment parts. Shaftless screw conveyors with high material thickness are often installed at treatment plants for transportation of sludge.
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