Double belt conveyor

Zhongji’s high precision manufacturing methods such as its narrow air gap tolerances and vertical offset between the slats as well as the parallelism between upper and lower chain belts are necessary to achieve a high standard of panel surface appearance.

Main feature:
1. Zhongji’s high precision manufacturing methods such as its narrow air gap tolerances and vertical offset between the slats as well as the parallelism between upper and lower chain belts are necessary to achieve a high standard of panel surface appearance.
2. For the drive unit of the double belt, two electronically controlled DC type motors have been selected, and are mounted separately on the upper and lower slat chain belt. The motor of the lower belt serves as a pilot drive and is electronically synchronized
with the motor of the upper belt to achieve a fully uniform and parallel movement of both slat chain belts. By this electronic synchronization, scratches on panel surface and any decrease of adhesive strength are avoided.
3. By means of several hydraulically operated sets of cylinders, the upper and lower slat chain belts are locked to each other in order to contain the foam’s pressure. Panel thickness is adjusted by exchangeable distance pieces which also serve as limit stops for the upper slat chain belt.
4. The thickness of our slats is over 10~12mm and our slats are the result of our own metal working technology, which assures our product of a 20 year working life with uniform flatness. The slats less than 10mm and without any special metal processing, can not be employed about 2 years after installation. A good quality panel has no variation of thickness, is flat and has no surface scratching,
which can be only produced from a highly precise slat.
Technical parameters:

Length of the distance between axles


Working height of lower chain belt

Approx. 1,250mm

Slat width


Slat length

Upper : 1,220mm

Lower    1,280mm

Number of slats

Approx. 500

Lifting distance of upper chain belt   

  (required during maintenance)

Max. 200 mm

Panel thickness

20 ~ 50mm

Foaming pressure

Max. 0.5 bar/cm2

Deflection of slats

Max. 0.05mm

Power requirement for drive

Approx. 2 × 7.5kw

Production speed Max 8m/min

Specifications (modules):
1. The upper and lower frame are made of welded steel construction.
2. Hardened and ground guiding rails for supporting the bearings of the slat chains in a longitudinal direction
3. Slats made of welded steel construction including roller bearings, pin with PU-bushes, lubricator nipple, etc.
4. Screw jack for lifting and lowering the upper slat chain belt as well as for locking the upper and lower slat chain belt to compensate for the foaming pressure.
5. Returning wheels keep on returning the upper and lower slat conveyor by rotating with chain.
6. A drive unit consisting of two frequency-controlled A.C. motors driving separately the upper and lower slat chain belt, and an electric synchronization system. The lower drive unit serves as a pilot drive for the entire plan.
7. A automatic tension adjustment device to automatically adjust the tension of slat conveyor.
8. One planet gear with clutch and flange for the upper and lower slat chain belt and which also support the motors.

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