Based on our 40 years of experience in innovative design and provision of leadingedge conveying technology, spirac is able to adapt easily to changing industry. It enables higher trough loading and lower rpms, maximizing the volume of materials conveyed. Material is conveyed by an extraheavyduty shaftless screw that slides on a lowfriction. The video shows the operating principle of shaftless screw conveyors and examples of application. Kws designs and manufactures shaftless screw conveyors to meet the needs of many industries, such as chemical, rendering, wood products and wastewater treatment.
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. The ssc shaftless screw or spiral conveyor is an alternative concept to the traditional shafted screw conveyor. Typical costs of material handling equipment components jms. To enable complete transport solutions, both vertical and horizontal. Shaftless spirals reduce maintenance needs, as they can work filled to a far greater degree in conveyors. 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. One of the main reason to use a shaftless conveyor is the ability to handle. Screw conveyors are performing their assigned tasks in virtually all types of industries and, in addition, special designs are being developed for use. Screw conveyor basic design calculation cema conveyor equipment manufacturer association approach. With her beautiful curves, controlled and disciplined gait and the smooth delivery. We have it onsite at rubyanna wwtp, recommend them for any plants for the future or even retrofitting. Typical costs of material handling equipment components. The only machined bearings in a shaftless are in the gear reducer. Gimat presents a new generation of shaftless screw conveyors that compliments its well known and highly valued range of flexible screw conveyors a shaftless screw.
Shaftless screw conveyor design standards engineering guide. Suitable for a wide range of moisture content and viscosities. Since 1978, our screw conveyor systems have been installed in many of the largest and most complex dewatered sludge cake applications in north america. A wide variety of shaftless screw conveyor options are available to. The model tf shaftless screw conveyor is utilized for the transport of screenings, grit or sludge in municipal and industrial wastewater treatment applications. 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. Conventional screw feeder or screw conveyor idea is taken with its functionality instead its a shiftless functioning here. Shaftless screw conveyer material handling solutions. 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.
Used to convey bulk materials from one part of a process to another, horizontal screw conveyors are. Shafted screw conveyors vs shaftless screw conveyors jms. The orthman shaftless screw is engineered and designed to convey difficult to move products that would normally be a problem for a typical screw conveyor. Shaftless screws are available from 6 to 24 diameters in single flight and 9 to 24 diameter. Spirac shaftless screw conveyors with horizontal, inclined and vertical orientation with no intermediate or end bearings, low rpm and low power usage is a space. Shaftless screw design and calculation myth assumption. Pdf screw conveyor engineering guide pt lunga mkafane. Finally, the kws shaftless screw conveyor design allows for greater. Similar to ribbon screws, used for conveying sticky, gummy or. However, a screw may also be used to heat or cool a product as it is being conveyed. The screw conveyors shall be shaftless, screwtype units designed to transfer dewatered sludge from the centrifuges to the hopper. The ssc shaftless spiral conveyor has provided efficient and reliable transport of various difficult to transport materials for decades. 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 ssc shaftless screw conveyor is an alternative concept to the traditional shafted screw conveyor. Single and double screw conveyors are commonly used to transfer bulk material solids. The screw conveyor design procedure on the following page gives ten stepbystep instructions for properly designing. Shaftless spiral conveyors spirac solid handling solutions. Kws shaftless screw conveyors are designed to handle almost any bulk material, from dry and freeflowing to sticky and sluggish. Martin shaftless conveyors simple, pipeless design employs fewer parts than conventional shafted screw conveyors, reducing lifetime maintenance costs. Material handling screw conveyors and bucket elevators. If conducted, it would be the most sought out title in the conveyor world. This allows for direct connections and optimizes layout design flexibility. The screw conveyor design procedure on the following page gives ten stepbystep instruc tions for. Shaftless screw conveyors are ideal for bulk materials with high. In the description that follows, the expression shaftless screw conveyor, shaftless thread and shaftless screw will often be employed to designate a screw. Calculate helical screw conveyor in flat form using solidworks sheet.
When designing a shaftless screw for use in various types of equipment i. Applications and materials transported by shaftless spiral. Shaftless conveyors simple, pipeless design employs fewer parts than. About 72% of these are conveyors, 7% are material handling equipment parts. Free download cema safety best practice sbp005 design. Our organisaon is a trusted manufacturer and supplier of a superior quality range of screw conveyor.
Inclined and vertical shaftless conveyors also tend to have greater deflection when compared to horizontal shaftless screw conveyors of the same length. Screw conveyor segments screw conveyor segments are manufactured to your specifications. Shaftless screw conveyors designed to transport materials which are sticky, slushy, stringy syaftless plug forming. Cema safety committee, pdf, sbp 005, design and application of personnel barriers adjacent to elevated unit handling conveyors. The only connection point in a shaftless screw conveyor is at the drive end of the screw conveyor. Pdf design of screw feeding system with shaft less fights. The screw conveyors shall be shaftless, screw type units designed to transfer dewatered sludge from the centrifuges to the hopper. Screw conveyor basic design calculation cema conveyor. The shaftless design gives the opportunity to convey.
Due to this fact the calculation and design of such conveyors demands a lot of experience. 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. The trough liner is the spirals replaceable bearing surface. The material is conveyed by a heavyduty screw flighting without centre pipe which simply slides on a special wear. They are available with an outer diameter between 30 mm and 3. This heavy duty screw is manufactured in one continuous helix which rides on the bottom of the housing on a replaceable liner eliminating the need for hanger bearing supports. 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. Shaftless screw conveyor calculations engineering guide. The shaftless screw conveyors and components shall be designed and constructed in accordance with the conveyor equipment manufacturers association cema. Shaftless screw conveyor spirac jci industries inc. Martins shaftless screw eliminates jamming and buildup typical in shaftedscrew conveyors for greater uptime, higher efficiency, and lower maintenance.
Martins shaftless screw eliminates jamming and buildup typical in shafted screw conveyors for. Hydroscrew shaftless screw conveyors represent a new idea in bulk solids handling. Higher trough loading allows for lower operating speeds. 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. Screw conveyor shaftless screw conveyor manufacturer. The well known analytical models and standards for the calculation and the design of screw conveyors 15 or.
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