Factors affecting the accuracy of capsule filling machine

After years of experimentation and thinking, Liaoning Tianyi Machinery Co., Ltd. summarized the phenomenon that the volume of the capsule filling machine appeared in the filling project is not accurate. Systematic analysis of the filling control accuracy of the capsule filling machine and the influencing factors of the filling structure and the influencing factors of the filling material itself enable the operator to have a countermeasure understanding.

Most of the domestic capsule filling machines are mainly filled type quantitative method, and the filling amount is determined by the thickness of the measuring plate, which is related to the bulk density of the filling material. At the same time, the accuracy of the filling capacity control is related to the influencing factors of the filling structure and the influencing factors of the filling material itself.

1. Analysis of influencing factors of filling structure For the capsule filling machine of the filling type quantitative method, the filling amount of each capsule can be expressed by the following formula: W=kψρλV=kψρλπ/4×D2h, where W is for each capsule. Filling weight, mg; k is the filling rod preset coefficient, which is related to the initial pre-adjustment position of the five-position filling rod; ψ is the filling coefficient of the material; ρ is the bulk density of the material, mg/mm3; λ is the filling rod pressure Influence coefficient; D is the diameter of each metering hole in the metering disc, mm; h is the thickness of the metering disc, mm. The above formula can be simplified to Table 1 according to the different metering apertures configured for different capsule models.

Table 1 relationship between capsule model and capsule filling weight

Capsule model
0#
1#
2#
3#
4#
Measuring hole diameter mm
Φ6.3
Φ5.65
Φ5.2
Φ4.8
Φ4.3
Filling weight of each capsule W (mg)
31.16 kψρh
25.06 kψρh
21.03 kψρh
18.09 kψρh
14.51 kψρh


It can be seen that when the thickness h of the metering disc is constant, the variable factors affecting the accuracy of the filling capacity are related to k, ψ, ρ, λ.

1.1. Filling rod preset position coefficient k.

Because there are six station filling holes and corresponding filling rods on the general metering disc, and the initial pre-adjusting position of the filling rod (ie, the depth at which the punch is pressed into the filling hole) (as shown in Figure 1), five of them are considered. The station filling rods participate in the compaction of the material, and a station filling rod presses the powder column in the metering hole into the capsule body. However, the initial pre-adjustment position of the five station filling rods determines the weight of the powder cylinder that is pressed into the metering orifice. As shown in the figure, the depth of the pre-adjustment position of the filling rod into the metering hole is set to Δhi, and the depth Δhi of the pressing pre-positioning position is different, and the influence on the filling accuracy is also different. For this purpose, the filling rod preset coefficient k is introduced. According to the theoretical analysis and actual statistics, the preset position coefficient k of the filling rod can be obtained close to the following formula: k=1+ΣΔhi/5.5h, where k is the filling rod preset position coefficient k; h is the thickness of the metering disc, Mm; Σ Δhi refers to the sum of the filling rods of the first station to the fifth station, respectively, into the pre-adjusted position depth, Σ Δhi = Δh1 + Δh2 + Δh3 + Δh4 + Δh5 (mm). In general, the larger the pre-adjusted position depth sum ΣΔhi, the larger each capsule is loaded on the same metering disc. However, if the amount of ΣΔhi is too large, it will cause the filling to be too tightly compressed, resulting in a phenomenon of “stuffing powder”. According to the experience of use, the recommended range is 0 ≤ Σ Δhi ≤ 0.35% h, and Δh1 to Δh5 in Δhi are arranged in descending order. When the theoretical volume of the metering hole in the metering disc is close to the capsule loading, the amount of Δh1 to Δh4 can be selected to be small or close to 0, but Δh5 is selected to be 1-0.5mm slightly to reduce the "flying" of the metering disc during intermittent rotation. Powder phenomenon.

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