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RD-Series Rollovers are designed for
years of hard work through simple, yet rugged construction. They
have been designed by maintenance and foundrymen for
maintenance and foundrymen.
INDEX
Advantages
- No pit required for most foundry
system installations.
- All primary parts are
replaceable through the Palmer Spare Parts Department or
high-quality industrial supply houses.
- High torque rotation ensures
easy rolling of even the heaviest jobs.
- Easy customization to fit the
application’s exact needs.
- Items requiring preventative
maintenance are readily accessible.
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Safety Braking System
Palmer Manufacturing & Supply, Inc., was recently issued U.S. Patent No. 9,937,552 for its Safety Braking System for Rollover Draw Machines.
This patented braking system is unique to Rollover Draw Machines, as it is employed in conjunction with the regular service brake, although they operate separately. This dual system doubles the reliability and safety of the overall braking system.
Rollovers move and manipulate heavy molds. Our spring-loaded braking system is positioned away from the drum and held open by hydraulic pressure. Therefore, if power is lost, the control system automatically releases the spring which completely stops the system immediately. Additionally, there are encoders located on the mechanical drive and drum that monitor speed. If the speed varies by more than 1% the system also automatically activates the externally compressing bands.
"The Rollover Draw Machine is the heaviest piece of equipment in a no-bake system. We set out to design a safety braking system that would protect operators in the event of a drive or component failure. We are proud to have engineered an industry-first in this regard and to have been awarded this patent," said Jack Palmer, President.
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Power
Components
Rotation is achieved through the use of a
high torque, hydraulic motor direct coupled to a chain drive system. The
system is designed to utilize mechanical advantage for the benefit of
machine operation and component longevity. Speed is controlled using a
simple flow control valve arrangement.
On the standard model, rotational speeds,
acceleration, and deceleration are controlled by manual operator push
button controls.
With the optional PLC control upgrade,
rotational speed, acceleration, and deceleration functions are
controlled by the Allen-Bradley SLC 502 Series PLC in combination with
the hydraulic directional valves and high tolerance proximity sensors.
This heavy duty rotational power
mechanism drives a #120 chain rigid mounted to the main bearing ring of
the unit. Through gear reduction and motor sizing, torque requirements
are easily achieved.
Mechanical stops ensure that the machine
is correctly leveled prior to attempting to draw a mold or core.
Clamping is performed by dual, heavy-duty
hydraulic cylinders for the moving platen. Available clamping pressure
is controlled using pressure reducing valves mounted integrally to the
hydraulic manifold.
Pattern clamp (pre-hydraulic clamp close)
is achieved using industrial airbags attached to a standard lift bar
assembly. The mold box mounting plate is force clamped to two one-inch
thick, fixed width bars attached to the top of the conveyor channel. A
three phase reversing high intensity rotary (standard) or single phase
linear vibrator is also part of this assembly for ease of draw.
Variable width pattern clamping is
optional. Please consult with our factory for your specific
requirements.
The conveyor motors are high efficiency
hydraulic drives. Number 60 chain and sprockets, heavy-wall (0.300”
minimum) solid-shaft rollers, and commercially available outside flange
bearings mounted outside the conveyor frame combine for a virtually
indestructible conveyor which allows easy preventative maintenance and
easily replaceable parts as needed.
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Support
The RD Series does not require a pit in
most applications. The rotating weldment rides on four large diameter,
heavy-duty. fully machined, flanged wheels with external four bolt
flange bearings making for years of smooth operation. The wheels are
supported by a frame utilizing high strength square tubing. Machine
leveling is performed with leveling screws integral to the mounting feet
(included). The frame provides sufficient rigidity such that additional
shimming or support is not required.
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Controls
For the base machine, all functions of
the unit are controlled by the operator eliminating the need for a high
cost PLC.
With optional automatic operation, all
functions are controlled by the system PLC (Allen-Bradley SLC-5XX Series
is standard for this option). Remote high tolerance proximity and
photoelectric sensors provide location and status signals to the PLC.
The machine runs in either manual or fully automatic modes for
flexibility. The fully automated circuitry includes auto-draw and
proof-of-draw cycles. Auto-draw duration and attempt counts are
programmable.
The RD-Series controls can interface
easily with existing systems or interfaced directly with Palmer DURALOOP
or Carousel No-Bake Molding Systems.
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Flexibility
of Design
The RD-Series is easily customized to fit
the requirements of the
no-bake system in which it will operate.
Configuration options include:
| C-Frame: |
In-Line Single Side: |
Barrel: |
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 |
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Sizing
Standard RD Sizes
Include:
|
Model |
Nominal Mold Size |
Standard
Configuration |
|
RD-2000 |
36” x 48” x 24” |
C-Frame |
|
RD-4000 |
48” x 60” x 24” |
C-Frame |
|
RD-6000 |
60” x 60” x 36” |
Barrel |
|
RD-10000 |
72” x 72” x 36” |
Barrel |
|
RD-15000 |
84” x 84” x 36” |
Barrel |
|
RD-20000 |
96” x 96” x 36” |
Barrel |
|
PRD-233 |
120" x 54" x 40.5" |
C-Frame |
Custom sizing is
available.
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