Log bandmills

Bandsaw
Technology
Log bandmills
Log bandmill modules with highest precision and
flexibility for quality-orientated large log sawing
TM
TM
Bandsaw
Log bandmills
Technology
Log Carriages
EW 1000
The headblocks
The log turners
welded steel construction and are moved on precision ma-
single chain arm turners or V-type double arms to provide
The headblocks are made in extra heavy, shock-resistant
chined block supports. All lumber supports are hard-chrome
plated and exchangeable. All headblocks have independent
positioning by means of servo-hydraulic setworks with very
Log turners are on board mounted and are available as
The headblock forms a unit with an own axle and a pair of
for fast turning in both directions. The spacing of the log-
allows the spacing of the headblocks to be customized to suit
turners can be customized to individual requirements.
wheels, to avoid any flexing of the carriage frame. This design
the individual requirements.
The hydraulic system
All movements for log/lumber manipulation on the carriage are
hydraulic and the required supply of hydraulic power is provided from a stationary power unit. This reduces the carriage
masses required to be moved and increases the dynamics.
high setting speeds and can therefore be adapted to every log
The slab turners
The carriage drive
The power supply system
re can be adjusted stepless by remote control from the opera-
half-sawn logs or slabs.
bandmill with an own drive system to have always constant
to the carriage via a top-mounted low wear Flex Power Chain.
shape. The clamping is done hydraulically. The applied pressutor panel to suit the sawing requirements. To keep a low build
The slab turners allow the fast turning and putting upright of
height, each headblock is equipped with two upper dogs, which
The carriage frame and running drive
independently from the headblocks. This function allows to ad-
tributes significantly to the accuracy of the sawn lumber. The
are applied according to log size. The dogs can be adjusted
just the dog standout position stepless and to pull the lumber
against the vertical supports to ensure dimensional accuracy of
even the last board being sawn.
The high precision of the carriage running drive and track conwheels are made of tempered, wear resisting special steel
and are generously sized with a diameter of 300 mm and wide
wheel faces.
The carriage drive is generally done separate from the log
drive situations, i.e. with frequency converter drives. The
choice available is between a compact hydrostatic drive
system with a gearless low revolution drive motor or a highly
dynamic electric drive system with a frequency-converter
controlled gear motor. Both drive concepts are equipped with
a strongly dimensioned steel rope and winch drum. With the
Hydraulic, electric power and bus control cables are connected
The central oil lubrication
The automatic central oil lubrication supplies all slide move-
ments of carriage and rails and thus reduces the maintenance
work drastically.
electric drive system, a regenerative drive concept is available
as an option.
V-On-board log turner
Log carriage EW 1000
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Slab turner
.
TM
Bandsaw
Log bandmills
Technology
Log bandmills Modul EBB
1400, 1600, 1800 (optional with double cut, slabber)
The bandmill wheels
The saw blade guides
Controls and comfort of operation
Options
quality spheroid graphite iron. The surface hardness of this
the saw blade out of the vertical line during the cut. To avo-
• Windows operator interface with menu-driven controls
• Extensive operation messages displayed in plain
• Automatic positioning of the log or cant
Due to the high stresses, both wheels are made from high
material allows years of operation without needs to regrind
the wheels. The design of the wheels has been optimized
by FiniteElements computer calculations. The solid bottom
wheel with it‘s higher momentum always pulls the band
through the cut.
The wheel inclination
For precise alignment of the sawblade running the top wheel
is tilted with an electric motor with remote control.
The saw guides are cartridge type pressure guides,pressing
id any collision between clamped log and the saw blade
during the return move of the carriage for the next cut, the
bandmill with the saw is set back hydraulically, controlled
by an initiator sensor. The top guide is height adjustable
with a hydraulic cylinder. The bandmill is set on guides and
can be fitted optionally with a servo-hydraulic setwork.
Thus the maximum opening between headblock and bandsaw can be increased to 1400 mm for oversize logs. The
bandmill is optionally available with wheels for double cut
action.
• Industrial type PC, operator terminal and color monitor
• Permanent display of all important values and parameters
language, with test and service functions
• Ergonomically designed, comfortable operator’s control chair
• Quick and easy operation, full operator control
and overridefunctions
board dimensions and next cut dimension with hot keys.
automatic selection of the required carriage knees and • “Optiline”-system with real-time display of the saw line and display of selected sawing dimensions on the log or cant
• Log scanning
• Optimization for center products and side boards
• Production and shift reports
• Software for processing of custom sawn timber
• Automatic carriage feed speed control based on sawing • Automatic knee setting for next cut, selection of fixed • Automatic positioning of the carriage for reloading and • Double cut action set-up
log turners
speed, saw performance and motor load (option only available with frequency converter control for drive motors)
• 17°slanted bandmill and carriage
• Reduced wiring work, short start-up times and easy maintenance and trouble-shooting because of
decentralized control design.
Ergonomic operator cabin and controls
Log bandmill EBB 1800 for double cut action, slabber unit PF 19 and carriage EW 1000
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Circular saw unit for vertical and horizontal rip-cuts
.
TM
Bandsaw
Log bandmills
Technology
Tandem–Log bandmills Modul EBB V/2
Tandem-Log bandmills (optional with double-cut action, slabber)
The systems
The Tandem Log bandmills can, together with the slabber
The patented version EBB VR/2 + PF 19 (Tandem-Log
V/2 + PF 19 (Tandem Log bandmill and slabber unit) cuts
the forward pass of the carriage and if desired or necessary
unit open the log and saw off 2 boards in one pass. The EBB
only on the forward pass of the carriage.The first bandmill
has a servo-hydraulic setwork for positioning. The second
bandmill is pulled back hydraulically for the return pass of
the carriage by an initiator.
Bandmill with double cut action and slabber unit) cuts on
on the return pass as well. Both bandmills have servo-
hydraulic setworks.The first saw entering the log makes the
outer cut. The respective second saw makes the inner cut.
The use of the EWD Tandem Bandmill system with forward
and backward sawing action can increase the sawn volume performance, compared to a conventional single band
headrig by up to 250 % (please see the production comparison on the next page).
The operation
The application
saw or both saws for a pass, depending on the individual
breakdown machines. They can however –in the double cut
The operator can always decide if he wants to use just one
circumstances. Logs can be processed in a semi-automatic
mode, based on a selected sawing pattern, if the log quality
does not require a grade sawing breakdown.
The Tandem Log Bandmills are normally used as primary
mode –also do the resawing. Based on the sawmill size and
production program, a Tandem Log bandmill system can
be combined with an automatic edger system with sawing
heights up to 120 mm or a combination edger/gang system with sawing heights up to 225 mm or a resawing center
with highly flexible single arbor circular saws with sawing
heights up to 225 mm or double arbor circular resaws with
sawing height of up to 360 mm.
Sawing two products at each pass forward and backward
Tandem-Log Bandmill EBB 1800 with forward/backward sawing, slabber unit PF 19 and carriage EW 1000
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Resawing in forward and backward mode
.
TM
Bandsaw
Log bandmills
Productivity comparison
Log bandmill layouts
of the log bandmill versions under identical conditions
Layout samples
D=50
D =cm
50 cm
D = 40
D=40
cmcm
Saw pattern
Technology
Tandem headrig
D=60
cm60 cm
D=
EBB 1800 VR/2 + PF19 with combination op-
timizing edger/gang system Optimes Line and
BNK 6. Larger cants are resawn on the tandem headrig
Equipment
100%
3
2
1
100%
100%
4
EBB V/1
Tandem headrig
EBB VR/2 + PF19 with flexible double arbor
123%
117%
119%
gang and optimizing edger system OptimesLine.
When processing large logs only, the mill capacity exceeds 50.000 m² log intake/year and
shift.
PF 19 + EBB V/1
154%
142%
148%
177%
184%
214%
PF 19 + EBB VR/1
Tandem headrig
EBB VR/2 + PF19 S in combination with a second primary breakdown machine, i.e. a frame
saw or a double arbor circular saw DWK SG.
PF 19 + EBB V/2
Cants are processed by a flexible double arbor
resaw DWK6, boards are sent to an automatic
192%
207%
269%
optimizing edger system OptimesLine.
PF 19 + EBB VR/2
1
2
Only primary breakdown
Only primary breakdown
3
4
Primary and secondary breakdown
The comparativfigures are based on calculations
Modul headrig size: EBB 1800
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.
Bandsaw
Log bandmills
TM
Log bandmills-Module EBB
Technical data
Functions and technical components
Bandsaw carriage, Log bandmills-Modules, Slabber PF 19
The hydraulic strain system
Carriage
The sawing accuracy of a bandsaw depends heavily on the bandsaw strain system. The EWD strain system offers
a very fast reaction time and instantaneous shockabsorption. One short stroke, quick reaction hydraulic cylinder
provides strain, which can be adjusted infinitely to create the saw strain from 0 - 200 N/mm². The saw strain is then
automatically kept constant, even when encountering different sawing loads, such as changing log density or knots.
Headblock opening
EW 1000
vertical / horizontal max.
mm
1000 / 1400
Headblock set speeds max.
mm/s
500
Track width
Carriage speed max.
Carriage drive power
mm
m/min
kW
Log bandmill Modules
30 - 45
EBB 1400
EBB 1600
EBB 1800
1400
1600
1800
Saw blade width
mm
180/206
206/250
206/250
Saw blade strain max.
Saw blade speed max.
The saw strain is directly transferred to the machine frame by utilizing the dead arbor concept. The drive shaft is thereby
200
mm
Saw blade thickness max.
The wheel bearings
1300
Wheel diameter
Wheel face width
Drive motor size
Technology
mm
mm
N/mm²
m/s
kW
160/200
1,47
200
55
55 - 75
190/230
1,65
200
55
75 - 90
190/230
1,83
200
55
90 - 132
not loaded with bending stresses. Advantage: minimum bearing wear, highest precision and smooth running.
a Bottom wheel
aClamping cylinder
Slabbber
c Dead arbor
cLarge log dog
Slabber head diameter
mm
1240
Chipping depth max.
mm
190
dSmall log dog
d Machine frame
e Drive pulley
No. of main knives
Chipping height above log support max.
Set distance incl. park situation
Feed speed

b c
PF 19
bDog travel cylinder
b Drive shaft
d
e
Drive motor size
c
d
b
Machine weight w/ drive motor (132 kW)
pcs.
mm
mm
m/min
kW
t
3, 4, 6
670
0 - 850
20 - 150
75 - 132 (@ 1500 rpm)
5
a
Due to constant product improvements or developments the illustrations and specifications contained in this brochure are subject to change without notice.
10
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11.
Custom-made solutions
Custom-made
solutions
Custom-made solutions
Custom-made solutions
Bandsaw
Technology
Edger Optimizer
Technology
CircularSaw & Profiling Technology
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Esterer WD GmbH
Estererstraße 12
84503 Altötting, Germany
phone: +49 (0)86 71 - 5 03 - 0
fax: +49 (0)86 71 - 5 03 - 386
e-mail: [email protected]
internet:www.ewd.de
Esterer WD GmbH
Täleswiesenstraße 7
72770 Reutlingen, Germany
phone: +49 (0)71 21 - 56 65 - 0
fax: +49 (0)71 21 - 56 65 - 400
e-mail: [email protected]
internet:www.ewd.de
© Esterer WD GmbH – rev. 002_09
TM