The main structure and use of the pre-compression device of the tablet press

The main structure of the pre-pressing device of the tablet press: There are two main pressing wheels (with bearings inside the pressing wheels) and two pre-pressing wheels in the grooves on both sides of the upper pressing wheel frame. The main pressing wheel of the tablet press is set on the eccentric shaft. A lever is connected to the hollow sleeve at the outer end of the shaft, and a compression spring is arranged at the right end of the hollow sleeve. When the pressure on the surface of the main pressure roller is too large, the eccentric torque compresses the spring through the lever and then the eccentric shaft rotates, increasing the distance between the upper and lower pressure rollers and reducing the pressure, so as to protect the safe use of the parts and dies, so the top of the upper pressure roller frame is rotated Adjust the screw to make the pressure of the spring just enough. For example, the overload alarm light will automatically flash, and the touch screen fault page of the tablet press will display the fault. Introduction to the use of the pre-compression device of the tablet press: 1. The function of the pre-compression system is to eliminate the air filled by the die, so the main extrusion process can be shortened, which can improve the work efficiency of the tablet press, but the pre-compression should not be too large. The assembly produces a lot of noise and wear on pharma machinery, dies and even no main pressure display. 2. To adjust the pre-pressure, adjust the adjusting nut of the upper pre-compression wheel so that the pre-compression wheel just touches the upper punch and then start the tablet press machine. The pressure wheel turns from turning to just stop, then turn the pre-pressure handwheel counterclockwise, and then make the pre-pressure wheel never turn to just turn. For the production of tablets with the same thickness, it only needs to be adjusted once. The purpose of the pre-compression device of the tablet press is to remove the air in the granules at the beginning of tablet compression, so as to buffer the main pressure and improve the quality and output. The upper preload wheel changes the position of the upper punch entering the middle mold, and the lower preload wheel can adjust the position of the lower punch entering the middle mold to achieve the adjustment effect of preload. Pre-pressing and main pressing Die depth and tablet thickness adjustment During pre-pressing and main pressing, the punching depth and tablet thickness can be adjusted by the handwheel, and the two handwheels of the high-speed tablet press can be Die-in depths obtained distance variations of 0.16 mm and 0.1 mm, respectively. The maximum pressure of the two pressure rollers can reach 20kN and 100kN respectively. The pressure sensor is used in the pressure part to sample and amplify the electrical signal generated by the weak change of pre-pressure and main pressure, and control and adjust the pressure to make the operation automatic. By increasing the number of sets of dies and improving the feed device, it has gradually developed into a high-speed tablet pressing machine. The components of the pressure pharmaceutical tablet press are divided into two parts: pre-compression and main compression. The high-speed tablet press has a relatively independent adjustment mechanism and control mechanism.

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