• B100     100-250# Batch
• B300     250#-500# Batch
• B500     500#-1000# Batch

In all aspects of the B-Series design the operators and maintenance personnel that will be working on the machine were of utmost priority.  The design is simple, rugged, and easy to maintain.  This is the premise on which Palmer Mfg. has grown and is certainly the basis for the B-Series.

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Drive   

		The mixing blade assembly is powered by a 10 to 25 HP drive based on the size of the unit.  The drive is integrally coupled to a right angle gearbox that drives the mixing blade.  The included variable frequency drive ties directly to the drive motor for simple adjustment of high and low rotational speed of the blade.
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The primary mixing gearbox is mounted directly under the floor of the mixing chamber eliminating difficult to reach and maintain seal-sets below the mixer.  All chamber sealing is accomplished inside the body of the mixer.  With no chains, belts, or extraneous seals to maintain, the B-Series provides greater mixing up-time and minimal preventative maintenance time. The mixing blade can be removed from the primary rotation shaft (leaving the shaft in the mixing chamber) or the entire blade / shaft assembly can be removed together.  The keyed drive shaft simply drops in from the top and is retained from the bottom side of the gearbox. RETURN TO TOP

Mixing Chamber

		The mixing chamber is built of three primary components:  a heavy wall outer body (3/4” minimum thickness) comprises the external shell.  A ½” thick abrasion resistant inner lining coupled with a 1” thick abrasion resistant floor significantly reduce liner changes.
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Poured urethane inner linings are available as optional components.  Either the wall liner or floor liner or both can be produced from urethane. Two massive mixing chamber doors allow easy access to both sides of the mixer allowing easy cleaning and replacement of wear parts.   As required, the lid is removable for rebuild or replacement of interior liners. RETURN TO TOP

Discharge Door

		Door seal is maintained using a heavy-duty, high load air cylinder coupled with a heavy-duty linkage for positive door closure.  This door sealing method is not only simple, but rugged.
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The discharge chute is constructed of 1/2” thick steel with a ultra-high molecular weight polyethylene liner, preventing sticking and build-up of sand.  The liner is easily replaceable for maintenance as required.   RETURN TO TOP

Mixing Cycle 

1. The mixer is started in low speed and the butterfly valve opens regulating sand flow into the mixing chamber.  Low speed is used during fill to minimize airborne dust.  If installed, the powder feeder will feed in material during the sand filling to ensure homogeneous dry mixing. 
2. The resin components are then injected utilizing low-pressure air assist.  The air assist is constantly active to ensure that the jet ports do not clog. 
3. Once resins are injected, the mixer accelerates to the high speed mix for the necessary mixing duration. 
4. After the mixing time has expired, the mixer switches to low speed and the discharge door opens.  Low speed discharge reduces slinging of mixed sand onto components outside the mixer body.  Once the majority of the sand is discharged, the mixer shifts to high speed for final emptying and the door closes. 
5. A small batch of scrubbing sand is introduced to the mixing chamber for cleaning at high speed.  This sand will be used as part of the next batch. 
6. Once the cleaning cycle is complete, the mixer shuts down until called for the next batch.

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Controls

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Pumping System

The pumping system is housed in a separate NEMA enclosure to protect he components from the plant environment.  The system will consist of: 

The DC volt gearhead motors provide consistent output RPM across their full output range. 

The pumps are direct coupled to the drive motors to eliminate the inaccuracy found in chain, belt, and gear reduction couplings.  The direct in-line coupling also eliminates all side load on pump bearings and packing, extending the life of the pump. 

Fast response air actuated ball valves provide instant routing of chemicals to the mixing chamber. 

A low-pressure air jet system provides a low CFM airflow to help introduce the chemicals into the mixing chamber and keep the mixing chamber resin ports clear.  The air jet system is fully adjustable via flow controls located in the electrical enclosure. 

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B-Series Options to Consider 

Fixed Volume Sand Metering System – Sand of a known and consistent density can be metered into the batch mixing system by a fixed, known volume.  An upper sand flow valve opens to allow sand into a fixed volume chamber.  When the mixer calls for sand, the upper butterfly closes and the lower butterfly opens.  This low cost sand metering system is the ultimate in simplicity.  Sand volume is adjusted using a variable height sand feed pipe.  Accuracy is 2% or better based on weight 

Integrated Triple Load Cell Weighing System – The standard operation of the mixer uses timed fill rate.  An optional, PLC controlled three-load cell system can be installed for sand addition with accuracy of 0.5% or better. 

Flo-Watch Liquid Monitoring System - This system provides positive displacement flow meters for Parts 1 and 2.  Based on the calibrated sand weight, the liquid pumps are run until the preset binder level requirements have been met.  The accuracy of these flow meters completely offsets the need for high maintenance, cumbersome, fixed volume chemical addition cylinders.  This option includes the standard resin recirculation option 

Powder Feeder - This flexible hopper volumetric feeder is used to add powder materials to the mixing chamber 

SCS Core Sand Delivery System – This option allows the mixer to remain stationary while a car delivers mixed sand to one of multiple core machines.  This option also allows a batch of sand to be mixed while the shuttle car is delivering, reducing core machine waiting time.  These systems are standard from Palmer Manufacturing.  Advise our sales department of your exact needs for a precise quote. 

Dual Discharge Doors – Dual discharge doors are available as a standard option.  The second door can lead to a clean-out chute or, depending on the installation, can feed a second core machine.  Doors are located 180° apart. 

Mobile Batch Mixer Operation – This option is used when a single batch mixer is used to feed multiple core machines.  The standard mixer is mounted to a transfer car powered by a 1-hp drive for primary motion.  Generally, the PLC system that governs the transfer car is also utilized for high-end batching sequences used for individual core machines.  Consult our factory for application specific costing of a mobile system.   

Urethane Liner – Poured bottom and side liners area available.  Either or both liners can be replaced with urethane.  Liners are easily replaced and are held in place with cast-in studs nutted on the outside of the mixing chamber.   

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