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Complete cooling with no worries
- Long lasting operation with no need for maintenance
- Reduction of vibration and noise to minimum levels
- No need for adjustment
Screw coolers are used to reduce temperature of powder material.
Cooling takes place in two parts of the cooler. The first part is made of double screw, placed in two pipes located next to each other. The heat of material is carried away by water flowing through the double wall of the pipes, cover and hollow shafts of the screw. The cooled material is mixed by blades welded to the screw. They move with small allowance over the trough bed and provide for high intensity cooling. The cooled material passes to the second part of the cooler with pipe screw consisting of pipe and screw. The pipe has a double wall. The cooling water passes through the double wall of the pipe as well as the hollow shaft.
Transition cone, which is covered by glass-cloth from outside, ensures the discharge of material between the first and second parts of the cooler and at the second part outlet into the turnstile of the pneumatic transportation. Flanges with removable ends are welded to the trough and pipe. Screws are carried in anti-friction bearings located in separate or flange housings.
First part of the screw cooler is driven by two slip gear-boxes with el.motors of SEW. Operation revolutions of both el.motors are adjusted during trial run of the cooler, or it is possible to adjust the revolutions according to the immediate output of the rotation kiln.
The cooling water is brought to and taken away from the screw by a rotation conduit screwed onto the shaft ends. This solution enables long lasting operation without need for maintenance. However, the shafts must always, during rotation, be filled with water to avoid their damage.
The cooler parts are made of material 17 251, the parts which are cooled by water from 17 240. Both cooler parts are located on supporting steel structures, which enable screw cooler inclination within a small range, thus the speed of material passage and cooling intensity can be altered.
During trial run, the need for inclination change of both parts of the cooler is checked.
The design reduces the vibrations and noise level of the cooling unit to the minimum levels. It is anchored to the steel structure by supporting lugs. It is the supporting structure that makes the change of cooler inclination possible by shifting the supporting legs. The carrying structure is fixed to the concrete floor by anchoring bolts.
The cooler does not need adjustment; it works within the set production parameters. Operation revolutions can be adjusted by frequency converters according to operation experience and the output of the rotation kiln, in which the product is being cooled.
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