How to solve the problem of material leakage with plate screen changer?

Plate type screen changer structure: Its main filtering components are composed of a slider, positioning pins, feed sealing copper rings, gap adjusting nuts, splitter plates, and discharge sealing copper pads, as shown in Figure 1. The main function of the gap adjusting nut is to seal and tightly fit one end of the feed sealing copper ring and the sliding plate through rotation adjustment, to prevent plastic solution from leaking out between the feed sealing copper ring and the sliding plate; The plastic solution is filtered through a splitter plate, and the filtered plastic solution flows out through the discharge port.

Structure diagram of rapid extrusion screen changer device

The reason for material leakage at the sealing point of the plate type hydraulic screen changer: It is not difficult to see from Figure 1 that when the feeding sealing ring is tightly matched with the sliding plate through the gap adjusting nut, the other end of the feeding sealing copper ring will separate from the bottom end face of the feeding port, creating a certain gap. In this case, in order to truly prevent material leakage, only the outer diameter of the feed sealing copper ring and the precision of the fit of the feed sealing copper ring placement groove are very high. However, in fact, due to machining errors, this high fit is difficult to achieve during machining, and a phenomenon as shown in Figure 2 will occur, resulting in small relative fit gaps. It is not difficult to see from the following figure that when the plastic solution is subjected to slightly higher pressure, it will leak out from the resulting gap

material leakage route

Through the above analysis, it can be confirmed that the plastic solution flows out of the fitting gap under high pressure. To solve this type of material leakage, it is necessary to make the structure more perfect and solve the possible gap problem. Analyzing and designing this situation, the mechanical structure obtained is shown in the following figure

Mechanical structure of leak proof material

This structure mainly consists of a feeding sealing ring, a gap adjusting nut, an intermediate sealing ring, a copper sleeve, and a copper gasket (placed at the bottom of the feeding sealing copper ring groove). The internal thread of the clearance adjusting nut is divided into left thread and right thread. The left thread is connected with the feed seal ring, and the right thread is connected with the middle seal ring. When the gap adjusting nut is placed clockwise, the feed sealing ring and intermediate sealing ring will move towards both sides. To improve the sealing performance of both sides, red copper pads will be added to the outer end of the feed sealing ring, and red copper sleeves will be added to the outer end of the intermediate sealing ring. Due to the soft nature of the red copper, it can better seal the gap adjusting nut under pressure. At the same time, in order to prevent synchronous rotation or twisting of the feed sealing ring and the intermediate sealing ring when the gap adjusting nut rotates, two positioning pins are specially added. The positioning pins run through the feed sealing ring and the intermediate sealing ring, and both ends are connected to the pin holes of the feed sealing copper ring and the pin grooves on the sliding plate. The overall structure is shown in Figure 4

Mechanical structure diagram after design

In addition, the expansion coefficient of red copper is relatively high, and it will generate thermal expansion under high temperature conditions, which can further improve the sealing effect and solve the problem of material leakage in the plate type mesh exchanger.

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