With the rapid development of the pharmaceutical industry, CNC screw dispensing machines are increasingly used in the production of powder injection preparations. Because the screw filling machine has higher packing dose than the airflow filling machine, the consumption is small, and it is not restricted by the crystal shape of the powder. For those small and bulky powders, they can also be dispensed. Therefore, the screw dispenser is more widely used in the production of preparations. The difference in loading is an important indicator to measure the performance of the packaging machine. A small difference in loading indicates that the machine is good. The following summarizes several factors affecting the loading of the screw packing machine as follows:
First, the screw filling machine is generally controlled by the microcomputer to control the number of steps of the motor, and then control the amount of powder. Therefore, the quality of the microcomputer circuit board plays a decisive role. A good circuit board controls the number of motor revolutions accurately, without missing phase and accurate positioning, so the difference in loading is small and the performance is good.
Second, the screw of the screw packing machine is also an aspect that affects the loading. Especially the pitch of the screw. Theoretically speaking, the smaller the pitch of the screw, the better the loading. However, due to the physical properties of the powder, too small a pitch will affect the loading of the powder with poor fluidity. The difference in the amount of loading will be greater. According to the physical properties of the machine powder in general. It is suitable to select a screw zui having a pitch of 8 to 1 nn. The angle of the screw blades will also affect the loading.
Third, the installation of the screw packing machine will also affect the loading. The mechanical connections of all parts of the repacking machine should be firm and stable. After the repacking machine is cleaned, the installation of the screw is especially important when reinstalling. The installation position of the screw is an important factor affecting the load. The end of the screw should be parallel to the hopper outlet. The screw is not too good for the upper or lower part of the screw.
Fourth, the size of the component hole is also a factor that affects accuracy. If the component pores are too small, the powder coming out of the screw will not easily fall into the vial, causing the gag, causing the loading to be unstable. The component pores are too large to hold the powder and do not work.
5. The influence of the physical properties of the powder. The first is the fluidity of the powder, and the powder with good fluidity is easy to dispense. Powders with poor fluidity will not be easy to dispense. Secondly, the specific volume of the powder affects the accuracy of the powder loading, and the powder with a small specific volume is not easy to be dispensed, and vice versa. The single powder or the mixed powder directly affects the specific volume of the powder, so the single powder is easier to dispense than the mixed powder.
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