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Rotary tablet press is a multi-printing machine with wide application in production. Although its models are different, the pressing mechanism and principle are basically the same, mainly composed of power part, transmission part and working part. The power part is powered by an electric motor, the first stage of the transmission is a pulley, and the second stage is a machine (also called a middle plate) that drives the tablet press by the worm.
The working part includes: a machine for punching the die, a pressure roller, a sheet weight regulator, a pressure regulator, a hopper, a powder feeder, a vacuum cleaner and a protective load. The machine is mounted on the central axis of the machine base, and the machine table The upper layer is the upper punching disc, the upper punch is inserted into the disc to be lifted and lowered; the middle is a fixed die die plate, which constitutes a turntable having a plurality of die holes; the lower layer is a lower punching turntable, and the lower punch is inserted into the disk, along the The undershooting track can be raised and lowered; above the upper punching wheel, there is a vertical pressing wheel perpendicular thereto, and there is a lower pressing wheel at a corresponding position below the machine table, and each time the machine table rotates, each upper punch passes the previous one. The pressure roller is pressed down once, and the lower punch is pressed up once by the lower pressing wheel, at which time the upper and lower punches extrude the particles into tablets in the die hole.
The punch can rotate when it rotates (the individual types cannot rotate). There is a fixed powder feeder on the mold plate, and the hopper is placed on top of it. The granules are continuously added to the powder feeder. The mold plate rotates once, and each die passes through the duster once and once. The material is pressed once.
The pressure regulator adjusts the position of the lower pressing wheel. When the lower pressing wheel is raised, the distance between the upper and lower pressing wheels is shortened, the distance between the upper and lower punches is also shortened, and the pressure is increased; otherwise, the pressure is lowered. The sheet weight adjuster is mounted on the lower rail. It is a copper swash plate that can adjust the height and lowering, so that the undershoot can be raised or lowered to adjust the filling amount of the particles in the die hole. The excess particles can be scraped off by the scraper to ensure The film is accurate.
Problems encountered in the use of rotary tablet presses
Zyzhan guide: Rotary tablet press is a tablet press which is improved by the disadvantage of uneven pressure distribution caused by one-side pressurization of single punching machine. It is a widely used tablet press in production. This tableting machine has a reasonable feeding mode, small difference in tablet weight, high efficiency and low noise. Since the upper and lower punches are uniformly pressurized at the same time, the air in the drug particles has a sufficient time to escape from the die hole, which improves the density uniformity of the tablet and reduces the phenomenon of splitting.