Screener Options

 Options:

You can chose from the options on the following pages:

Segmented Screen Inserts

 

Segmented screening inserts

 
 

The idea of segmented screens is based on dividing the screening surface into one round central segment and 6 to 8 outer segments like the segments of an orange. The bouncing ball cleaning system is also segmented so that screening inserts segmented in this way can operate effectively. Segmented screening inserts are protected by international patents.

Reduction in spare part costs

Segmenting the screen frames has a particularly advantageous effect in larger tumbler screening machines in terms of operating, maintenance and spare parts costs: If there is a screen tear, it is no longer necessary to replace the entire screening insert, but only the segment affected.

The smaller screen segments can withstand significantly higher loadings, and therefore achieve significantly longer service lives.

Simple handling

In the past, changing large screens used to require several people. Changing a screen segment is something that can be done by one person, and the downtime of a screening machine is reduced significantly. The sequence of benefits is added to by easier storage and less expensive transport of the smaller individual segments.

 

Hinged Cover for Round Screeners

 

A hinged cover makes many things easier

 
 

Screening machines with a hinged cover as an individual machine variant meet the requirements for rapid access to the screening inserts.

Benefit

When there are frequent product changes, the cleaning procedure can be performed more rapidly, whilst the risk of damaging the mesh cloth (which is usually delicate) is significantly reduced.

Easy to operate, quick-clamping elements ensure rapid locking of the cover and a high degree of seal integrity. As the seals settle with age, the reduction in contact pressure forces can be compensated straightforwardly by means of adjustment.

Retrofitting possible

Vibration and tumbler screening machines up to medium sizes can be equipped with the hinged cover system.

 

 

Quick Clamping System

 

Quick-clamping systems

 
 

Quick clamps enable the torque required for reliable operation of the screening machine to be set on the clamping elements. In machines with more than three decks, an additional spring pack is installed to compensate for the natural settling of the seals.

 

Benefit

When there are frequent product changes, tumbler screening machines can be changed over in a short time by using the quick clamps. The clamps can be unlocked without tools and provide quick access to the screen deck for changing the screening inserts.

 

Flexibility for your production

Quick access to the screening systems from Allgaier have made it possible to provide additional, flexible machine variants with high levels of operating comfort and which help you to reduce your production costs.

 

 

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Deck Lifting Systems

 

Deck Lifting Systems

 
 

The easily operated, mobile lifting device from Allgaier significantly accelerates the process of screen changes and screen inspection in tumbler screening machines.

Dock and go

The patented, highly flexible docking system consists of three or four pneumatically operated lifting cylinders with lifting rods, depending on the machine size. They can be quickly and easily attached to the clamping bolt holders provided as standard, and taken into operation using pushbutton control.

Following the lifting procedure, the lifting cylinders and holders are removed again. This means no additional weight is imposed on the machine.

Retrofitting possible

The system can be retrofitted easily.

Video of the exchange of screens at a TSM 1200 with QUICK CLAMPS and pneumatic lifting device

 

Drive Synchronization

 

Drive Synchronization - Neutralizes Vibration

 
 

The problem

If several tumbler screeners are operated in parallel in a building or a shared steel structure without the building statics having been configured accordingly, dynamic residual forces can arise and generate resonance vibration which, in the worst-case scenario, can result in connection elements to the screeners shearing off.

The solution

Our electronically controlled drive synchronization provides the remedy by damping up to 95 % of the horizontal residual forces. The recirculating balancing weights of the tumbler screening machines are positioned in relation to one another so that the imbalances cancel one another out, and the stability of steel fabrications or decks is not impaired.

Synchronization takes place using a central electronic control unit according to the master/slave principle.

Retrofitting possible

The control system can be retrofitted, and can encompass two or more tumbler screeners.

    

 

Fine Balancing

 

Improved Fine Balancing for Tumbler Screeners

 
 

Our newly developed fine balancing procedure called Multi Balance enables residual imbalances in tumbler screening machines to be almost entirely eliminated.

 

Benefit

Less risk of vibration and resonance effects in steel structures or concrete buildings.

 

Retrofitting possible

The new balancing system can also be retrofitted to older tumbler screening machines.

 

Process Monitoring

 

Process monitoring for Screeners

 
 

Our newly developed patented system monitors the material outfeed from all of our screening machines.

Fault notification without omission

A proximity-type signal transmitter detects the height of the outfeed layer. Overload, blockage or screen breakage can be detected quickly by a change in the outfeed layer height, therefore this allows any deviation from the optimum operating condition to be detected immediately, and faulty production avoided.

 

 

Ultra Sonic Screen Cleaning

 

Ultrasonic screening system

 
 

To achieve a greater separation precision with ultrafine mesh screens combined with an optimum screening performance, Allgaier equips its tumbler and vibration screening machines with an ultrasonic system.

Benefits

By imposing a high-frequency vibration on the screen fabric, friction and adhesion forces in the product mat are overcome and production without disruptions is guaranteed. Acoustic propagation across the entire screen area means that even large screen fabrics can be activated effectively and kept clear.

Various possible applications

This technology is successfully used in applications such as processing difficult products in the chemical and pharmaceutical industries.

Retrofitting possible

The ultrasonic technology can be retrofitted at any time and is also optionally available in a segmented version.

 

 

Ultra Sonic Air Cleaning

 

Ultrasonic Air Cleaning - Optimizes Ultra Fine Screening

 
 
 

The combination of ultrasonic and air cleaning was first shown at the POWTECH 2007 and used for keeping the screen fabric clear, enables Allgaier to optimize the performance of tumbler screening machines quite decisively.

Increase in separating precision

Tumbler screening machines are particularly suited to screening products with fine and ultrafine particles. In this case, products that are difficult to screen are screened with the support of ultrasonic or air purification devices. Superimposing ultrasonic and air cleaning in the marginal area of the round screening insert proves particularly effective. The marginal particles are screened in this zone. The air loosens the screening material, whilst microvibrations generated by ultrasound overcome the forces holding the particles together, thereby increasing the separation precision.

Improved yield

The highly effective combination of both cleaning processes significantly improves yield. Tests with ultrafine polyamide powder that is difficult to screen revealed an increase in yield of +65 % compared to screening with ultrasound support alone or +43 % compared to screening with air cleaning alone.

The throughput also increases when using the ultrasonic/air cleaning process, namely by +68 % compared to the ultrasonic cleaning and +86 % compared to air cleaning.

Even finer

The new combination cleaning process means ultrafine screening is possible with mesh widths down to 0.032 mm using tumbler screening machines. Ultrasonic air cleaning allows economical screening of products with a sharply defined separation precision. The complicated and cost-intensive process of fractionation using sifters can be dispensed with.

Varied uses

Application areas include: plastics, cellulose, powder coatings, toner, wax, metals, pearlite, silicon, abrasives, coke, gypsum, quartz sand, enamel powder, starch, rice flour, etc.

Retrofitting possible

The combination of ultrasonic and air cleaning has been protected by a utility model and can be retrofitted to existing tumbler screening machines without difficulty.

 

Download the PDF here:

Ultrasonic/Air-cleaning combo optimizes fine screening

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