Installation of Bridge-breaking Feeding Bin and Feeder

One of basic reference data for the control system of the extruder is the material flow rate, and the addition level of water, steam and other liquids in the system shall refer to the material flow rate, therefore the stability of material flow will directly affect that of the whole extruder producing. To ensure stable materials flow, weighing feeding is used in this system, namely, put the whole feeding bin and feeder onto the weighing sensor, so as to form a closed-loop control among weighing sensor, frequency-converted feeder and computer, and then realize feeding.

A basic requirement to the weighing feeding of the feed extruder is a flexible connection between upper and lower interface, namely, the flexible connection between bridge-breaking feeding bin and pneumatic gate at upper part of the bin, as well as the flexible connection between feeder outlet and conditioner inlet, canvas is usually used as the material for flexible connection for this two parts.



Installation of weighing sensor is another important factor affecting the feeding. There are generally two methods for sensor installation: hanging installation and supporting installation, which will be used as required in the site. Necessary measures shall be taken to ensure stability of bin body while hanging installation is used. During production of extruding machine, falling down of materials, when feeding to the feeding bin, will make the whole bin body waggled, the waggling extent and time will closely related to the length of sensor's tie bar. Although the control procedure uses the data prior to feeding for the data in the period of material entering the bin, waggling of the body will be also caused after material enters the bin, the weighing accuracy of sensor will be directly affected, and thus the control procedure will also be influenced, therefore it is required to equip with a limit device at the lower part of bin, and this device shall not affect weighting.



The another method is supporting installation, which will not cause waggling, but the whole bin body on the extruding machinery tends to translocation, therefore sensor should be fixed on a bracket during installation, and it is required to mount limit blocks at both sides of each ear of the feeding bin, so as to prevent the whole bin body from translocation.

It is necessary to pay attention to the position of access door during installation of bridge-breaking feeding bin, and the maintenance platform should be mounted at the lower part of access door while ensuring that the access door can be opened.

MY56×2A Twin-Screw Extruder

The extruder is mainly composed of a feeder, a different diameter cylinder conditioner, an extruding device, simple pipeline system and electric control, see following picture.



The feeder is mainly used for feeding the material to conditioner in a certain amount, the equipped motor is of the frequency conversion speed control motor, and the rotation speed can be adjusted based on actual production situation.

The feeder of the extruding machinery is mainly composed of a convertor motor, a feeding bin, an anti-bridge device, a screw conveying device and a discharging out let, see following picture. The working procedure is: material in the feeding bin is pulled forward along the axial of the screw conveying device by the convertor motor, and then drop into the conditioner through the discharging outlet. At the same time, the anti-bridge shaft drove by the chain is rotating in the feeding bin to prevent generating blockage.



The conditioner on the extruding machine is made of complete stainless steel and mainly composed of a speed reducer motor, a feeding inlet, a water inlet, a steam inlet, a stirring shaft, a conditioning cylinder and a discharging outlet. Main features are shown as follows: two agitator shafts with different diameters and rotation speeds agitate the material through back cross movement, the agitation efficiency is good at that the material, steam, water or other liquid can be sufficiently mixed; and a housing with large volume is used so that the material can be kept long enough under a certain temperature and moisture content in the conditioner on the purpose for ripening.



Advantages of conditioning:
a. The production capacity can be improved.
The partially cooking material with steam needs a very less mechanical energy for heating products to the maximum temperature, therefore, as for a device with designated power, and the production capacity is greater than dry feed extruder with the same power.
b. The forming capability is greater.
The use of steam and water can make the water content of material be improved, and this will greatly improve the forming performance and final quality of the products.
c. The abrasion of extruding parts is reduced.
The cooked material has the corresponding temperature and ripeness, therefore, too much higher pressure and abrasion in the machine chamber are not required, and also the water can be used for lubricating, these can greatly reduce abrasion, so that service life of machine chamber and screw can be increased.
d. The gelatinization of product can be improved.
The steam cooking can improve gelatinization of produce, make it more taste and easier for absorption.