Mill Liner Handlers

Mill Liner Handlers

PaR Systems, Inc. 707 County Road E West Shoreview, Minnesota 55126-7007 USA

Toll Free: 1.800.464.1320 Tel: 1.651.484.7261 Fax: 1.651.483.2689 www.par.com

Trusted Partner

Since 1961

PaR Systems is an

integrated group of

businesses that

specialize in custom

engineered systems.

Clients come to PaR

for solutions that

add real value for

their customers.

PaR has developed

and delivered mill

liner handlers for

mines around the

world, including:

Alcoa – Australia

Amax – Colorado

Anglo-American

– South Africa

ASARCO – Arizona

Bouganville Copper

– New Guinea

Bullfrog Mines – Nevada

CIE, Brighton – China

Codelco – Chile

Cypres-Pima Mining

– Arizona

ESSAR, MN Steel

– Minnesota

Hanna Mining

– Missouri

Highland Valley Copper

– Canada

Montos Blancos

– Mexico

ORMD, Mamut Copper

– Malaysia

Sharon Steel Continental

– New Mexico

SNIM – Africa

Liner handler capacities are available up to 10,000 pounds, and larger.

FAST, EASY, SAFE RELINING

Whether your grinding mill is a large ball or

rod mill, semi-autogenous or autogenous,

you can reline your mill faster, easier, and

safer with PaR Systems’ mill liner handlers.

PaR understands your mill lining

requirements; since 1961, PaR has been

designing and installing liner handlers

world-wide.

PaR offers a standard range of mill liner

handlers to fit your application; from the

MLH 123 which is designed for 36-inch

trunnion openings and loads up to 2,000

pounds, to the MLH 1023 with a wrist

capacity of 10,000 pounds. Even larger

capacity handlers are available upon

request.

ON-TIME DELIVERY

PaR can deliver your mill liner handler with

your unique requirements to fit your

schedule.

ASSEMBLY NOT REQUIRED

PaR mill liner handlers are delivered fully

assembled. The operator’s seat is typically

mounted on the boom. Depending on the

configuration, the hydraulic grapple lifts,

tilts, and orients a liner for aligning and

bolting into position. As old liners are freed

from the mill, they are hydraulically lifted

and placed on the handler’s roller

conveyor/cart. The conveyor/cart transfers

old liners outside and brings new liners

inside.

The operator usually relines two or three

rows below the horizontal and above the

charge level before inching the mill to the

next two or three rows to be relined. The

knuckled boom and 360-degree boom

rotation make it easy to reline both sides of

the mill before inching the mill to the next

few rows to be relined.

Designed for Complete Safety



DESIGN BENEFITS

• The MLH 123 trolley-mounted boom and grapple provide exact positioning of liners against the mill. The MLH

523 and MLH 1023 accomplish the same task, but the boom is fixed to the end of the beam.

• The outside support stand and the inside runway support roller add to the handler’s structural rigidity and

boom control. Slide pads are used on high capacity machines.

• The boom’s extended reach and freedom to rotate 360 degrees allow 180 degrees of the mill to be relined

without repositioning the mill.

• All mill liner handlers come standard with manually operated hydraulic controls, with optional proportional

joystick controls available.

• All control circuits are equipped with ground fault protectors for worker safety.

• Load-supporting hydraulics are fitted with velocity fuses to lock motion in the event of a line break.

• Solid rubber tires provide sure traction for maneuvering on uneven floors and around obstructions.

-2-



FIVE MODELS OF MILL LINER HANDLERS

The MLH 123 at 2,000-lb. capacity is used in large diameter rod and ball mills with trunnion diameters greater than

36 inches. The 2,000-lb. capacity MLH 240 is designed to reline both large ball and small semi-autogenous (SAG)

mills with the same machine. The new MLH 520 replaces the previous MLH 320 for large SAG and autogenous (AG)

mills. The MLH 320 has been a dependable workhorse in the industry for over 40 years, and was designed to

handle loads up to 4,000 pounds.

The new MLH 520 now has a 5,000-lb. capacity due to its redesigned knuckle. Models MLH 523 and MLH 1023

feature high capacity wrists that are capable of handling liners up to 5,000 and 10,000 pounds, respectively. Many

components from the five different models can be intermixed to meet the mill’s unique requirement. A wide

variety of custom stands and boom motions have been developed and delivered over the last forty years, many

which can be adapted as necessary. Larger capacity handlers are available upon request.

DESIGN FLEXIBLITY

In order to effectively install liners, the boom "bounce" must be minimized. The operator cannot finely control the

liner if the boom is oscillating by several inches. The major component of the handler flexibility is the torsional

stiffness of the runway beam. Multiple torque cavities in the runway structure and a design based on the mill

opening and load, produces a beam as rigid as the space will allow.

PaR mill liner handlers are designed for each unique application, as opposed to simply varying the stand height and

the boom length for a particular mill size. The inner and outer booms are adjusted to provide the best match, the

stands are adapted to meet the space requirements, optional boom motions are provided, and a range of options

are available to meet specific customer requirements.

PaR has provided a wide variety of stands for special applications; 12-foot wide

stands have been used to bridge discharge sumps. When overhead crane

access is available, the rear drive wheel and front wheels are replaced

with wheels that ride on the feed chute rails. The handler is then

lowered onto the feed chute rails and pushed into position

by a fork lift. PaR works with its clients to customize a

solution to satisfy any space constraints.

MAJOR COMPONENTS

• Grapple

• Boom

• Boom Base

• Controls

• Runway Beam

• Liner Cart/Conveyor

• Stand

• Wheel Drive System

• Hydraulic System

• Electrical Controls

-3-

Five Models Handle All Requirements



SPECIFICATIONS

Mill Diameter

feet (meters)

Minimum

Trunnion Dia.1,2

inches (millimeters)

Load Capacity

pounds (kilograms)

Hydraulic

Pressure

psi (bar)

Hydraulic Flow

gpm (lpm)

Maximum Power

Requirement3

hp (kilowatts)

MLH 123 12-18 (4-6) 36 (900) 2,000 (900) 2,000 (137) 15 (60) 20 (15)

MLH 240 16-30 (4.9-9) 50 (1,270) 2,000 (900) 2,000 (137) 10 (40) 20 (15)

MLH 520 18-40 (5.5-12) 54 (1,370) 5,000 (1,800) 2,000 (137) 15 (60) 20 (15)

MLH 523 18-40 (5.5-12) 74.5 (1,892) 5,000 (1,800) 3,000 (207) 18 (72) 40 (30)

MLH 1023 24-40 (7-12) 80 (2,032) 10,000 (4,536) 3,000 (207) 30 (120) 75 (56)

MLH 123 Motion Actuator Travel Speed 4

Boom Rotate Hydraulic Motor/Ring Gear 360 degrees 2 rpm

Boom Elevate Dual Hydraulic Cylinder 90 degrees 1 rpm

Boom Extend Hydraulic Cylinder 16” (40 mm) 5”/second (0.13 mm/sec.)

Grapple Rotate 1 Rotary Actuator/ Manual 150 degrees 3.5 rpm

Grapple Pivot Hydraulic Cylinder 90 degrees 4 rpm

Trolley Hydraulic Motor As Required 24 fpm (7.2 m/minute)

MLH 520 Motion Actuator Travel Speed 4

Boom Rotate Hydraulic Motor/Ring Gear 360 degrees 2 rpm

Boom Elevate Dual Hydraulic Cylinder 90 degrees 1 rpm

Boom Extend Hydraulic Cylinder 34-46” (86-117 cm) 20 fpm (6 m/minute)

Liner Cart Hydraulic Motor As Required 20 fpm (6 m/minute)

1 The grapple rotate may be manually operated or powered, depending on the trunnion opening.

2 Smaller trunnion diameter is available with reduced lifting capacity.

3 The power requirement is customized for the available power supply.

4 Maximum speed is listed. The control system provides proportional control from zero to the adjustable maximum speed.

CODES AND STANDARDS

Protective Coatings: The standard color is OSHA Safety Yellow. The standard paint is a self-priming two part

epoxy. Special paint and colors are available.

Electrical Standards – Robot Controller: ANSI/NFPA 70, National Electric Code® and UL 508A, Industrial Control Panels

Materials: ASTM

Welding: ASME Section IX Welding or ANSI/AWS D1.1 Structural Welding Code

Construction: ASIC Manual of Steel Construction

QA (PaR’s QAMP-2): ISO 9001/2000 ANSI/ISO/ASQ/Q9001-20005

5 The Quality Management System is applicable to “Design, Manufacture, Integration, and Servicing of Industrial Robots, Material

Handling Systems and Manipulators”.

Copyright October 2011 PaR Systems, Inc. All rights reserved.

-4-

Trusted Partner – Since 1961

Documents

Mill Liner Handlers