Coarse Material Washers

GreyStone coarse material washers feature a unique adjustable screw shaft design, giving producers precise control over product specifications. The line consists of both single and twin screw models that process up to 2″ feed material. A variety of screw diameter sizes, from 24″ to 44″, are available with production capacities up to 500 TPH.

Coarse Material Washer Features

  • Motor and Drive Assembly
  • Shaft-Mounted Gear Box Drive
  • Shafting
  • Shaft and Flights
  • Adjustable Screw Shaft
  • Standard Ni-Hard Adjustable Wear Shoes
  • Adjustable Paddle
  • External Bearing
  • Large Heavy Duty Tub
  • Rising Current Belly Pan
  • Heavy Duty Skid Frame
  • Send Us A Sample

MOTOR AND DRIVE ASSEMBLY

The shaft-mounted gear reduction is totally enclosed within an oil-bath gear box. The reduction is designed with easy service and customer convenience in mind. By simply changing the drive pulley on the motor, you may increase or decrease the speed to custom-tailor the washing action on your material. All electric motors are 230-460 Volt, 3-phase. Parts required for routine maintenance are standard, off-the-shelf components for easy replacement.

SHAFT-MOUNTED GEAR BOX DRIVE

A greatly improved drive is used on all GreyStone washers. Based on the use of standard, direct, shaft-mounted speed reducers, the drive provides several significant advantages.

  • The drive is fully enclosed, with all gears running in a sealed oil bath.
  • Maintenance is economical since only stock reducers are used.
  • The drive is simplified by reducing the number of shafts, bearings, and other components.
  • The transmission is highly efficient because of the direct shaft arrangement, with V-belt drive to electric motor and belt guard.
  • Falk or Dodge shaft-mounted gear reduction drives are used and are readily available.

SHAFTING

The heavy stub of mirror-smooth, heat-treated shafting is fitted into a stainless steel spacing sleeve. Shaft and sleeve are driven through a heavy duty rubber gasket that fits snugly between the connecting disc and tub. A specially designed slinger fits perpendicular to the shaft between the roller bearing and sleeve and turns with the shaft, adding further protection to the outside mounted bearing from the seal leakage which may follow extensive use.

SHAFT AND FLIGHTS

The spiral-type, half pitch steel flights are welded to a heavy tubular steel shaft. Each spiral screw flight is formed by a special machine to ensure a uniform spiral. The shaft flanges are precision ground after they have been welded onto the heavy tubular steel shaft.

ADJUSTABLE SCREW SHAFT

The adjustable screw shaft makes a unique design. This will allow you to control the clearance between the belly pan and screw flights.

STANDARD NI-HARD ADJUSTABLE WEAR SHOES

Ni-Hard Wear Shoes are standard on GreyStone Coarse Material Washers.

ADJUSTABLE PADDLE

GreyStone paddles are made of heavy duty Ni-Hard. Paddle mounting bases are constructed to give years of trouble-free service life. Water is induced into the tub through the perforated belly pan. Sufficient water should be used to wash out and carry extraneous material out over the overflow flume at the lower tub end. Soluble clay and dust from gravel or crushed stone are eliminated from the material by this abrading washing action. For tougher washing requirements, more paddles can be added to the screw shaft to replace the flights. In this application, the material which is fed into the washer will be retained longer in the scrubbing area for more thorough cleaning. With the addition of more paddles on the screw shaft, your capacity will be reduced and horsepower requirements will be increased. GreyStone Coarse Material Washers are standard 1/2 pitch screw flights. The 2nd and 3rd screw flights are replaced with paddles. If additional paddles are needed to meet your job requirements, the 5th and 6th screw flights can be replaced with our optional paddle arrangement. For specific or severe washing problems that cannot be accomplished with a coarse material washer, please refer to the complete GreyStone line of Log Washers.

EXTERNAL BEARING

GreyStone Coarse Material Washers have externally mounted pillow block bearings that are standard, off-the-shelf components for easy replacement.

LARGE HEAVY DUTY TUB

Strong and rigidly constructed screw washers are designed to provide years of maintenance-free service. GreyStone tubs are all welded construction and are made of heavy steel plate with angle iron skid frame. GreyStone machines have a heavy belly pan which is curved to fit tightly to the screw shaft. During operation, this feature keeps sand from slipping back and increases your production. This feature allows you to make a field adjustment of the clearance between the spiral flight and the belly pan for closer tolerances.

RISING CURRENT BELLY PAN

The rising current water enters the pool from the bottom and filters up, separating fines, dirt and other extraneous matter, which is carried to the top and forced out with the overflow.

HEAVY DUTY SKID FRAME

GreyStone washers are equipped with a heavy duty skid frame. Pull a GreyStone to where it’s needed without using a crane…an Exclusive GreyStone Feature.

SEND US A SAMPLE

Send us a sample of your pit run material for a free examination and recommendation for the best equipment selection to meet your requirements.

Coarse Material Washer Specifications

SINGLE SCREWS
Size Screw Diameter Tub Length Tons/hr RPM hp Max

Mat’l

Size

Water

Req.

G.P.M.

Empty

Est.

Weight

24″ x 18′ 24″ 18′ 60-75 40 15 2″ 300-400 7,500
30″ x 18′ 30″ 18′ 100-125 35 20 2″ 300-500 8,600
30″ x 24′ 30″ 24′ 100-125 35 25 2″ 250-500 10,550
36″ x 18′ 36″ 18′ 150-175 30 25 2″ 400-600 10,880
36″ x 28′ 36″ 28′ 150-175 30 30 2″ 400-600 13,830
44″ x 20′ 44″ 20′ 200-250 26 30 2″ 500-750 14,200
44″ x 32′ 44″ 32′ 200-250 26 50 2″ 500-750 18,300
TWIN SCREWS
Size Screw

Diameter

Tub

Length

Tons/hr RPM hp Max

Mat’l

Size

Water

Req.

G.P.M.

Empty

Est.

Weight

30″ x 18′ 30″ 18′ 200-250 35 2-20 2″ 500-700 13,080
30″ x 24′ 30″ 24′ 200-250 35 2-25 2″ 600-1000 18,900
36″ x 18′ 36″ 18′ 250-300 30 2-25 2″ 700-1200 16,000
36″ x 28′ 36″ 28′ 250-300 30 2-30 2″ 700-1200 21,900
44″ x 20′ 44″ 20′ 450-500 26 2-30 2″ 1000-1500 27,000
44″ x 32′ 44″ 32′ 450-500 26 2-50 2″ 1000-1500 35,000

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