The Design of Slotted Type Screen Basket

Slotted Type Screen Basket

The slot is designed in a combination of conical and straight segments. The circumferential width of the conical groove gradually narrows along the flow direction, and its minimum width remains consistent with the width of the straight groove. This design allows the installation part of the vertical bar to be smoothly pressed into the slot, with the tapered section slot playing a precise centering role, while the straight section slot is responsible for further fixing and reinforcement.

The Design of Screen Basket Sieve Gap

The detailed shape design of the sieve gap takes into account the flow characteristics of the pulp. In the circumferential direction, one side of the vertical bar's drainage section is the upstream face, the other side is the downstream face, and the end face of the bar is the top face. Both the upstream and downstream surfaces are inclined against the flow direction of the pulp, and their inclination directions are opposite. The top surface is inclined from the back surface to the upstream surface. The inclination of the upstream side is greater than that of the downstream side, and its length is also longer. This design forms a narrow entrance between the top of the backing surface and the middle of the adjacent facing surface, which helps to efficiently screen the pulp. At the same time, there are chamfers between the top surface and the facing surface, as well as between the top surface and the backing surface, for transition connections to ensure that the pulp can smoothly pass through the sieve gap.

Wear Resistance of Slot Screen Basket

In order to improve the durability and wear resistance of the screen basket, a wear-resistant material treatment layer is provided on its inner top surface. By welding the top middle ring onto the upper flange, the bottom middle ring onto the lower flange, and correspondingly welding the top and bottom of the vertical bars onto the upper and lower flanges, the structural strength of the screen basket is further enhanced. In addition, to meet the requirements of different sizes of screen basket, at least one middle ring is designed as a composite layer middle ring, consisting of two middle rings welded together, thereby ensuring the strength and stability of the screen basket.

Assembly of Screen Basket

The assembly methods of the inner and outer screen basket are different during assembly. For the inner screen basket, first pre install all the installation parts of the vertical bars into the corresponding slots, then insert the expansion sleeve into the screen basket, and press the bars into the slots through the tightening force of the expansion sleeve to complete the assembly. For the outer screen basket, all the installation parts of the vertical bars are pre installed in the slots, and the bars are pressed into the slots for assembly through clamps. After assembly, simply install the upper and lower flanges into the papermaking pressure screen to use.