Hess Expert

4-belt single wood sanding machine
Ø Grinding at the bottom/top
Ø With 2 offset grinding units each (bottom and top)
Ø Grinding units (bottom and top) connected in series according to the Dressing principle
Ø Pre-sanding with coarse grit (calibrate)
Ø Regrinding with fine grit (finish)
Ø Central motorized height adjustment of the lower grinding units
Ø Central motorized and synchronous height adjustment of the entire upper
Grinding and brushing units including the upper transport units
Ø Oscillating sanding belt utilization (during the sanding process)
Ø Absolute power connection thanks to 5.5 KW motors and large dimensions drive drums
Ø Oxide ceramic grinding shoe for
- exact surface geometry
- no adjustment work
- permanent dimensional accuracy
- completely maintenance and wear-free

Basic structure:
Stable, heavy welded construction made of strong-walled rectangular profiles additional, statically calculated reinforcements for optimal
Vibration dampening.

Staggered grinding units with large dimensions
Belt drive drums for slip-free belt running.
Two-point suction for direct and flying dust with sealing brushes and integrated sanding belt blow-off
Device to increase the service life of the sanding belts.
Grinding units in heavy steel plate construction as the basis for vibration-damped, quiet tape running.
Absolutely backlash-free guides as ball linear sets hardened and ground shafts.
Height adjustment of the grinding units via hardened and ground special linear guides as well as pre-tensioned ones Guide carriage.
Permanent precision thanks to dust and dirt protection
Ball linear sets and guide carriages.
Large-sized pre-grinding rollers as contact rollers.
Contact rollers and Sanding shoes in a balanced ratio to the sanding belt grain load.
The large drive drums guarantee full transmission the 5.5 kW drive power of the grinding motors on the sanding belt.
Therefore Slip-free, stable running and optimal heat dissipation.
This makes it the strongest
Chip removal possible. Automatic machine stop activation in the event of a belt break.
Visual display on the control panel and via flashing lights on the machine.
Sanding shoes for finish completely maintenance-free and wear-free made of oxide ceramic with optimal heat dissipation.
Grinding belt tension via appropriately sized compression springs.
Sanding belt relaxation for belt changing using a pneumatic device sensitive, distortion-free placement of new tapes.
Upper grinding unit and brush device centrally motorized
Height adjustable with digital display in the control panel for the motorized Grinding thickness adjustment.

Brushing and finishing device, for better surface finish, integrated into the basic machine.
Two special brush rollers 150 mm Æ arranged one above the other in synchronous function for advance thrust.
Separate height adjustment of the brush rollers on precise
Carriage guides for post-correction of wear.
Additional transport roller for Removal or further transport of the workpiece from the automatic grinding machine with the conveyor belt.

Wooden guide in the inlet area for hard guide and bearings mounted on both sides pressure rollers.
Safe transport of profiled workpieces on calibrated ones Conveyor belts with infinitely adjustable feed speed.
Automatic machine stop triggering by wood thickness control device.
Visual display on the control panel and via flashing lights on the machine.

Inlet table via fine-running, precise threaded spindle for lower
Grinding chip removal via digital display in the control panel (resolution 0.01 mm) motor adjustable.
The long column table guide guarantees absolute Parallel adjustment.
The flight circle coordination to the exit table is carried out by
Height adjustment of the lower grinding units via precise threaded spindle
Scale display (resolution 0.1 mm).

Oscill setup. Utilization of the sanding belt to increase service life
Sanding belts and improvement of the surface finish through motorized sanding and brush unit transverse displacement.

Clear, user-friendly arrangement of all electrical functions and operating and display elements in the control panel:
Grinding unit below (pre-grinding regrinding), grinding unit on top, (pre-grinding-regrinding), automatic.
Star- Triangle start control of the grinding motors, belt utilization oscillation, brushing
and finish device (bottom = top), central height adjustment with digital
Dimension display, height adjustment of the infeed table with digital dimension display,
Operating display, fault display. Stop and emergency stop button.

2 potential-free contacts for pre-machine feed stop in the event of a malfunction.
Electrical protection of all motors against overload

Technical data :
Sanding belt speed 25 m/sec.
Grinding width 190 mm
Grinding thickness 4 - 180 mm
Shortest workpiece length 280 mm
Feed speed continuously adjustable 5 - 25 m/min.
Sanding belt dimensions 200 mm width, 1850 mm length
Electrical equipment according to VDE
Electrical connection 380 V., 3/N, 50 Hz.
Pneumatic connection R 3/8", 6 bar, 80 NL
Total connected load approx. 26 kW (at maximum load)
=Grinding units 4 x 5.5 kW
=Brushing and finishing device 2 x 0.75 kW
=feed 1.1 kW
=central height adjustment 0.55 kW
=Height adjustment Inlet table 0.06 kW
=Grinding belt utilization oscillation 0.12 kW
Exhaust air volume 3 x at least 2500 m³/h, 20 - 25 m/sec.
Suction connection piece 3 x 180 mm diameter, at the top of the machine housing
External dimensions
2450mm width
1900mm height
1200mm depth
Working height 830 mm
Weight: approx. 4200 kg

Paint finish: RAL 7013 stone gray with RAL 1018 zinc yellow
If the transport facilities for delivery and removal are not available are supplied, the customer must ensure that delivery is possible
the wood guide and the transverse push-off for possible removal are installed.
Danger ! The height settings of the infeed and outfeed
Equipment must be precisely coordinated with the grinding machine.

Workpiece blow-off device after
Brushing and finishing device using flat jet nozzles, below and arranged at the top
with solenoid control valve, separate maintenance unit and pressure control, with control for automatic.
Shutdown if no workpiece transport takes place.
Maximum air consumption: 4000 NL/h at 4 bar (only for workpiece transport)