The ring die and the pressing roller of the biomass pellet mill rotate at a constant speed, and the working state of each instant is basically the same. If the amount of feed material is unchanged, the energy consumption should also be relatively stable, and the current will be reflected on the motor. Also relatively stable.
When the biomass pellet mill machine is working, we adjust the feeding amount as long as the material thickness in the feeding area is less than the maximum starting point of the pressing area, it will directly affect the length of the effective working area of the pressing area and the pressing area, and cause the current to flow.
The fluctuation and the change of the hourly output of the biomass pellet mill, and if the thickness of the material layer in the feeding area is greater than the maximum starting point of the pressing area, in addition to increasing the thickness of the material layer in the feeding area, it will not affect the hourly output and energy consumption per unit time.
If there is any impact, it will no longer cause changes in current and biomass pellet mill output. Because the thickness of the material layer in the feeding zone exceeds the maximum starting point of the pressing zone, the interval between the pressing zone and the pressing zone is constant without any change.
In the interval where the multi-feed material is located, the clamping angle is greater than the critical friction angle, and the material will not be squeezed into the pressing area.
In this way, with the increase of the feeding amount of the biomass pellet mill, the balance of in and out is broken, and the in is greater than the out, and the material layer in the feeding area is It will accumulate thicker and thicker until all the gaps are filled and blocked to the feed port, so that the biomass pellet machine cannot work normally. At this time, the current will increase.
In the actual work of the biomass pellet mill, with the adjustment of the feeding amount, the instantaneous output and the current of the main motor will change accordingly. And when the feeding thickness does not exceed the maximum starting point of the pressing area, it will not cause more and more material layers in the feeding area due to the increase in the amount of powder we feed.
As has been said before, the area that can cause instantaneous output and energy consumption changes should be the two areas of work and material layers – the compression area and the biomass pellet machine extrusion area, so we think that the third area mentioned above- – The reasonable existence of the feeding area has certain conditions.
That is to say, the fed material layer is distributed in the compaction area, the extrusion area and the feeding area whose total thickness does not exceed the maximum entry point of the compaction area.
The biomass pellet mill will work normally under the allowable power. If the amount is too large and exceeds the thickness of the maximum starting point of the compaction area, the material layer will accumulate and gradually increase, and the biomass pellet making machine will not work normally. Current is fluctuating.
Through the above analysis, let’s discuss some phenomena exhibited by the biomass pellet mill under two possible working conditions:
When the power of the main motor is not large enough compared with the corresponding biomass pellet mill granulation parameters, the thickness of our feed is at the end of the extrusion zone and the maximum entry point of the compression zone (this will vary with the raw materials, compression ratio, effective length-diameter ratio, humidity, pressure rollers and other variable factors to adjust accordingly), generally will not exceed the maximum starting point, with the increase of the feeding amount, the compression area will change accordingly.
The length of the interval will be shortened, and the interval length of the squeeze area will gradually increase accordingly, and the current of the main motor will also gradually increase until it reaches the maximum allowable use.
If the current reaches the protection value we set, and the thickness of the feeding material has not exceeded the thickness of the maximum starting point of the biomass pellet machine pressing area, if the feeding amount is increased, the safety system will act, and the excess powder will be discharged. In order to ensure the normal function of biomass pellets.
Suppose the power of the main motor is very large or the motor fails to overload after the thickness of the feeding material exceeds the thickness of the maximum starting point of the pressing area due to the comprehensive changes of many variables.
At this time, the powder fed to the people cannot increase the time output, nor will it cause the increase of the main motor current, but can only continue to increase the powder pile accumulated in the machine until the inner cavity of the biomass pellet press machine is blocked.
Cause the biomass pellet mill to not work properly. Of course, this special phenomenon rarely occurs in actual production (if the raw material moisture is too large, the effective aspect ratio is too small, the pressure roller is severely worn and the gap is not adjusted properly, the raw material is replaced, etc., this phenomenon may occur), this is our undesired conditions.
In-depth analysis of the first commonly used working state, it is not difficult to know that on the premise that the relevant conditions are unchanged, with the change of the feeding amount, the interval length of the compression zone and the extrusion zone is within a certain range Corresponding changes are also made (the feed flow rate is reduced, the length of the extrusion zone is reduced, and the length of the compression zone is prolonged; otherwise, the extrusion zone is extended and the compression zone is shortened), and the feeding amount does not exceed the pressure.
When the thickness of the maximum starting point of the tight area is concerned, the lengths of the above two intervals are not a constant value when this article is written. The larger the extrusion zone length value, the higher the biomass pellet maker production efficiency and the longer the pellet length per extrusion per roller.
Therefore, it is concluded that the factors of current instability under the condition of controlling the feeding amount need to be investigated from the moisture content of the raw material, the effective aspect ratio is too small, the pressure roller is severely worn and the gap is not adjusted properly, and the raw materials are replaced.