A stacking coating method for side casting coating of a grain column

Abstract

The present invention discloses a stacking coating method for side casting coating of drug columns. First, plugging pieces are fixed at both ends of each drug column to be coated. The plugging pieces are discs whose diameter matches the outer diameter of the coated drug column product. The outer ring of the plugging piece is provided with drainage notches evenly distributed around the circumference. Each drug column to be coated is sequentially placed into the inner cavity of the coating mold, and the drainage notch of the upper end plugging piece of the lower drug column to be coated is aligned with the drainage notch of the lower end plugging piece of the upper drug column to be coated. Then, coating liquid is poured into the inner cavity of the coating mold until the coating liquid page is higher than the upper end plugging piece of the top drug column to be coated. After the coating liquid is solidified and formed, the stacked drug columns are taken out of the coating mold, and each drug column is cut and separated along the position of the plugging piece, and then the coating layer of the end of each drug column is removed by lathing to obtain a drug column product after side coating. The coating method of the present invention can realize the simultaneous side coating of multiple drug columns, and the coated drug column products have good consistency.

Description

Technical Field

[0001] The invention relates to a stacking coating method for side casting coating of a drug column, belonging to the technical field of drug charge coating. Background Art

[0002] Many charges are coated on the side by casting. The specific coating method is: according to the size of the charge and the coating layer, a special cylindrical mold and a positioning core rod are designed and processed. The mold is made of 45# steel and the inner wall is coated with a tetrafluoroethylene isolation layer. The end face of the drug column is glued with a nitro paint cloth coating sheet of a specified size to block the hole to ensure that the coating agent does not flow into the inner hole; insert the special core rod into the inner hole of the other end of the drug column to prevent the drug column from shaking in the mold and block the inner hole at the other end; pour the coating agent into the mold from the center of the upper end of the mold, slowly insert the prepared drug column into the mold, and when the bottom of the drug column contacts the coating agent, release the drug column and let it fall naturally. Place the special shaped copper block with the plane facing down on the drug column, and pressurize the drug column with a spiral pressure device. When the spiral rotates to the limit nut, stop pressurizing; put the mold after casting into an oven with a temperature of 70℃±2℃ for high-temperature curing, take out the mold after curing for more than 5h, and remove the mold after cooling naturally for more than 1h.

[0003] This coating method has the following defects: the coating mold design is difficult and the processing cycle is long; the mold is highly specific and basically cannot be used for other charges, and the mold idle rate is high; each mold can only cast and coat a single column of powder at a time, the operation is complicated, and the coating efficiency is low. Summary of the invention

[0004] The purpose of the present invention is to solve the problems of traditional grain side casting and coating process, such as difficulty in coating mold design, complex operation, only being able to cast and coat a single grain at a time, and low coating efficiency, and to provide a stacking coating method for grain side casting and coating.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] The stacking coating method for the side casting coating of a drug column of the present invention comprises the following specific coating steps:

[0007] 1) Adhere plugging pieces at both ends of each drug column to be coated to seal both ends of the inner hole of the drug column to be coated; the plugging piece is a round piece whose diameter matches the outer diameter of the coated drug column product, and the outer circle of the plugging piece is provided with drainage notches evenly distributed around the circumference;

[0008] 2) placing each of the to-be-coated medicine columns in turn into the inner cavity of a coating mold whose inner cavity diameter matches the outer diameter of the coated medicine column product, and aligning the drainage notch of the upper end plugging piece of the lower to-be-coated medicine column with the drainage notch of the lower end plugging piece of the upper to-be-coated medicine column;

[0009] The inner cavity diameter of the coating mold matches the outer diameter of the coated drug column product, and the inner cavity length of the coating mold is greater than the sum of the axial lengths of the multiple drug columns placed therein;

[0010] 3) pouring the coating liquid into the inner cavity of the coating mold until the coating liquid reaches a level higher than the upper end plug of the topmost drug column to be coated;

[0011] 4) After the coating liquid is solidified and formed, the stacked grains are taken out from the coating mold, each grain is cut and separated along the position of the plugging piece, and then the coating layer at the end of each grain is removed by lathing to obtain a grain product with side coating.

[0012] Beneficial Effects

[0013] The coating method of the present invention can realize the simultaneous side coating of multiple drug columns, thereby improving the coating efficiency. The coated drug column products have good consistency, and the coating mold used has a simple structure and can be widely used in the field of drug column side coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the casting coating process of the coating method of the present invention;

[0015] In the figure, 1-the drug column to be coated, 2-the coating mold, and 3-the plug. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Example

[0018] Figure 1 It is a schematic diagram of the casting coating process of the coating method of the present invention;

[0019] The stacking coating method for the side casting coating of a drug column of the present invention comprises the following specific coating steps:

[0020] 1) A plugging piece 3 is fixed at both ends of each drug column 1 to be coated, so that both ends of the inner hole of the drug column 1 to be coated are sealed; the plugging piece 3 is a round piece whose diameter matches the outer diameter of the coated drug column product, and the outer circle of the plugging piece 3 is provided with drainage notches evenly distributed around the circumference;

[0021] 2) placing each of the to-be-coated drug columns 1 in turn into the inner cavity of a coating mold 2 whose inner cavity diameter matches the outer diameter of the coated drug column product, and aligning the drainage notch of the upper end plugging piece 3 of the lower to-be-coated drug column 1 with the drainage notch of the lower end plugging piece 3 of the upper to-be-coated drug column 1;

[0022] The inner cavity diameter of the coating mold 2 matches the outer diameter of the coated drug column product, and the inner cavity length of the coating mold 2 is greater than the sum of the axial lengths of the multiple drug columns placed therein;

[0023] 3) pouring the coating liquid into the inner cavity of the coating mold 2 until the coating liquid reaches a level higher than the upper end plugging piece 3 of the topmost drug column 1 to be coated;

[0024] 4) After the coating liquid is solidified and formed, the stacked drug columns are taken out from the coating mold 2, and each drug column is cut and separated along the position of the plug 3, and then the coating layer at the end of each drug column is removed by lathing to obtain a drug column product with side coating.

Claims

1. A stacking coating method for side casting coating of a drug column, characterized in that The specific coating steps are as follows: 1) Adhere plugging pieces at both ends of each drug column to be coated to seal both ends of the inner hole of the drug column to be coated; the plugging piece is a round piece whose diameter matches the outer diameter of the coated drug column product, and the outer circle of the plugging piece is provided with drainage notches evenly distributed around the circumference; 2) placing each of the to-be-coated medicine columns in turn into the inner cavity of a coating mold whose inner cavity diameter matches the outer diameter of the coated medicine column product, and aligning the drainage notch of the upper end plugging piece of the lower to-be-coated medicine column with the drainage notch of the lower end plugging piece of the upper to-be-coated medicine column; The inner cavity diameter of the coating mold matches the outer diameter of the coated drug column product, and the inner cavity length of the coating mold is greater than the sum of the axial lengths of the multiple drug columns placed therein; 3) pouring coating liquid into the inner cavity of the coating mold until the liquid level of the coating liquid is higher than the upper end plugging piece of the topmost drug column to be coated; 4) After the coating liquid is solidified and formed, the stacked grains are taken out from the coating mold, each grain is cut and separated along the position of the plugging piece, and then the coating layer at the end of each grain is removed by lathing to obtain a grain product with side coating.

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