Main components of the rotary tablet press
Rotary tablet press is a multi-punch tablet press widely used in the pharmaceutical industry. Because the punch is relatively large in output, it is suitable for mass production. Because of its many punches, the structure is relatively responsible. Today we will tell Everyone rotates the main components of the tablet press. 1 turntable section 3 pressure roller part Imported Premium Chain Extender properties of the products. Chain extenders are alcohols or amines with low molecular weight multifunctional groups containing hydroxyl or amino groups. Common alcohols chain extenders include 1,4 dibutanediol (BDO), 1,6 dihexanediol, glycerol, trimethylolpropane, diethylene glycol (DEG), triethylene glycol, neopentyl glycol (NPG), sorbitol, diethylaminoethanol (DEAE), etc. Amine chain extenders include MOCA and formaldehyde modified liquid MOCA, ethylenediamine (DA), N, N-dihydroxyl (diisopropyl) aniline (HPA), etc. There is hydroquinone two (-hydroxyethyl) ether (HQEE), used as a polyurethane adhesive chain extender, its products heat resistance, hardness and elasticity are higher than the general use of chain extender. [1] Imported Premium Chain Extender,Textile Auxiliary Agent,Pvc Resin Heat Stabilizer,Premium Chain Extender Xingbang High Molecular Materials Co., Ltd. , https://www.chemicaladditive.com
The rotary table of the rotary tablet press is a circular disk, and the punch holes and the middle die holes are evenly distributed around the periphery. When it rotates under the driving of the main shaft, each punch moves up and down along the curved guide rail, thereby completing the pressing process. The turntable is the main working part of the tablet press. In the continuous work process, the analysis and solution of common faults are as follows:
(1) The long-term wear of the punch hole or the middle die hole causes the coaxiality of the two holes to meet the requirements: during the use, the punch and the middle die hole may have different shaft phenomena due to different degrees of wear, so that the punch The frictional resistance of the up and down movement increases, and in severe cases, the film cannot be normally pressed. If the wear is not serious, the coaxiality can be restored by reaming the rod hole with a reamer, and the turntable needs to be replaced when the wear is severe.
(2) The upshift of the turntable affects the filling or filming: the upshift of the turntable is generally caused by the looseness of the taper locking block of the fixed turntable, which can be solved by tightening the taper locking block. If there is a problem with the fastening screw, replace it immediately.
(3) The loosening of the middle die top wire causes the middle die to move up, and the feeder is worn out: the middle die moves up, mostly due to the looseness of the middle die top wire, and the middle die top wire can be solved. The middle die top wire is a wearing part, which can not be tightened by long-term wear and should be replaced in time.
2 rail section
The guide rail is an important part of the trajectory movement of the ram, and most of the faults are caused by the lack of lubrication. Its common fault analysis and solutions:
(1) Guide rail wear: The punch is curved on the guide rail and works normally by sliding friction, so the wear of the guide rail is one of the common maintenance faults of Zui. The guide rail is divided into the upper rail and the lower rail assembly, and the punch and the guide rail are worn. The lighter can be restored to normal with the oil stone grinding guide rail, and the wearer is only solved by replacing the guide rail.
(2) Loose rail components: The rail components may loosen after continuous operation, and should be tightened in time, and attention should be paid to make the guide rails smooth and smooth.
(3) The lower guide rail wears over the bridge plate, causing the punch to wear the guide rail main body: the lower guide rail crosses the bridge plate to protect the main body of the guide rail. If it is worn, the light is repaired with the oil stone, and the wear is severe and can only be replaced.
The pressure roller part can be divided into an upper pressing wheel and a lower pressing wheel, and is also a device for adjusting the pressure of the tablet and increasing the protection. Its common fault analysis and solutions:
(1) Wear of the pressure roller: The outer circle of the pressure roller is seriously worn, which will cause the resistance of the tail of the punch to be large, and the pressure roller must be replaced again. When the inner hole of the pressure roller and the pressure roller shaft are seriously worn, the pressure roller or the pressure roller shaft must also be replaced. In addition, the pressure roller shaft sometimes breaks and deforms, mainly due to excessive pressure. Most of them are caused by excessive adjustment of the material due to difficult pressure. At this time, the pressure roller shaft needs to be replaced, the material is adjusted, and the pressure is adjusted again.
(2) Oil roller shaft bearing lacks oil or damage: Regularly lubricate and maintain the pressure roller shaft bearing, and replace it in time for damage.
4 adjustment system (pressure regulation, filling adjustment)
The adjustment system includes pressure regulation system and filling adjustment system, common fault analysis and solution:
(1) Adjustment failure: Under normal circumstances, the adjustment failure is caused by the looseness of the handwheel screw, which makes the handwheel adjustment not work, or the adjustment of the worm wheel is stuck. In this case, check the adjustment handwheel and the worm wheel, and tighten the screws. Lubricate the rotating worm gear and other measures to solve.
(2) Unstable filling, the main reasons are: 1) material factors, uneven granulation or poor material flow; 2) stencil wear caused by different types or total height difference; 3) improper adjustment of hopper height, behind the feeder Insufficient grid packing; 4) The filling front rail in the filling rail assembly is seriously worn, and the jump is generated. At this time, the filling rail assembly should be replaced; 5) the lifting rod in the filling rail assembly is seriously worn, resulting in large adjustment gap and filling rail jitter. At this time, the filling rail assembly should be replaced; 6) the bottom surface of the feeder is seriously worn, resulting in uneven gap between the bottom surface of the feeder and the turntable; 7) the scraping board is seriously worn, resulting in poor powder scraping effect, and the scraping board should be replaced at this time; The under-crushing effect is poor, resulting in a plug.
(3) The tablet is loose or the appearance quality of the tablet is not good: the tablet is loose or the appearance quality is not good, mainly caused by small pressure, uneven particles, low water content or difficult to press the material composition. The solution is to adjust the pressure hand. The wheel increases the pressure, adjusts the particles and the ingredients of the excipients, and the particles are dried to be sprayed with 75% ethanol.
(4) When the tablet is pressed, the vibration of the machine has a loud sound: when the tablet is pressed, the machine has a loud sound due to the uneven pressure on both sides, and the adjustment pressure is solved.
5 feeding part
The feeding part includes two parts, the feeder and the hopper, and the frequently occurring fault analysis and solution:
(1) Leakage powder: The phenomenon of powder leakage is generally caused by the excessive gap between the bottom surface of the feeder or the scraper plate and the turntable. Adjusting the gap between the feeder or the scraper plate and the plane of the turntable will solve the problem. There must be a gap between the scraper and the turntable, which is usually measured with a feeler gauge. When installing the screws, it must be flat, to ensure the installation accuracy, to prevent the gap from being too large or too small to cause leakage or grinding the rotating table. You can pad a piece of paper when it is fixed, and then pull it out after fastening.
(2) Insufficient flash or material: The reason for the occurrence of flash or insufficient material is mainly due to the mismatch between material flow rate and turntable speed. When the rotation speed of the turntable is low and the material flow rate is fast, the flashing phenomenon occurs; when the rotation speed of the turntable is high and the material flow velocity is slow, the shortage of the material occurs. At this time, the material flow rate should be properly adjusted according to the rotation speed of the turntable.
6 overload protection system
Common fault analysis and solution of overload protection system: The main reason for frequent alarm is the pressure of the tablet pressure overload or the setting pressure of the overload protection spring is too small. The solution is to adjust the pressure handwheel, reduce the pressure or increase the overload protection spring setting. pressure.
7 gearbox
The gearbox is composed of a worm gear, a worm and a box. The common fault analysis and solution: the oil leakage of the gearbox is mainly caused by the looseness of the flange screw or the aging of the oil seal. The solution is to tighten the flange screw or replace the oil seal and seal it. glue.
8 tablet press mould
The tablet press often needs to change the mold during use. The abrasive tool is directly related to the quality of the product. Many equipment failures are caused by improper adjustment of the mold replacement. Before installing the tablet press, the power of the tablet press must be cut off, the cover plate, the lower rail, the hopper, and the feeder should be removed. Open the right door, gradually clean the turning surface, the die hole and the mounting die, and apply some vegetable oil outside the middle die and the punch to adjust the thickness to 5 mm or more.
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