Screen cylinder and multistage pulp pressure screen with same

Abstract

The invention provides a composite type screen cylinder and a multistage pressure screen with the same. The screen cylinder comprises at least two screen cylinder units which are sequentially arranged along the axial direction, wherein axial center lines of various screen cylinder units are coincident with each other; the inside diameters of the screen cylinder units are progressively increased along the axial direction; bottom ends of the previous stage of screen cylinder units are connected with top ends of the next stage of screen cylinder units through connectors; various screen cylinders connected with the connectors can realize the overall movement relative to a pressure screen shell; and liquid flow channels are arranged between two stages of screen cylinders. The screen cylinder has the advantages of simple structure and convenience in disassembly, washing and maintenance when applied to the multistage screen. Moreover, the composite type screen cylinder can be assembled and disassembled as a whole, so that the problem of complex operation of assembly and disassembly in the prior art when the screen cylinders on the lower layer are washed or maintained is solved.

Description

technical field [0001] The invention relates to the field of papermaking machinery, in particular to a screen drum and a multistage pulp pressure screen with the screen drum. technical background [0002] Papermaking is an indispensable daily consumer product in human daily life. However, papermaking is an industry with large investment, high energy consumption, serious pollution and large consumption of raw materials. For the paper industry, raw material resources are the most critical issue. At present, wood is generally used as raw material for papermaking, but the wood that can be cut down and used as raw material for papermaking generally needs to be at least 30 years old, so the supply of raw materials for papermaking is particularly tight. In order to solve the above problems, my country has implemented the medium and long-term development plan of "large-scale development of fast-growing poplar and integration of forestry, pulp and paper" in the northern region, and...

AI Technical Summary

Problems solved by technology

[0007] It can be seen that the multiple screen drums provided in the pulp multi-stage screen in the prior art do not have any connection relationship between the multiple screen drums, so that each screen drum constitutes a first-stage screening, and when the pulping multi-stage screen is used It is necessary to clean the screen drum for a period of time or when the screen drum breaks down, especially when a screen drum far away from the top cover needs to be cleaned or fails, after the top cover needs to be opened, all the screen drums located on the upper layer of the screen drum Only when all the screen drums are completely disassembled can the lower screen drums be taken out for cleaning or maintenance, and after the processing is completed, multiple screen drums need to be put into the shell in turn for installation, which greatly increases the cleaning or maintenance costs. Difficulty of operation

[0008] Moreover, in the field of papermaking technology, there are many factors that easily cause screen drum clogging and need to be cleaned or repaired, including: first, changes in the quality, concentration, and temperature of waste paper pulp; second, pulp feeding during pulping and pulp pressure changes; third, the water volume and pressure of the dilution water change; fourth, the rotor rotor is worn during the production process, making it impossible to scrape off the slurry adhering to the screen drum immediately

Therefore, due to the above factors, the frequency of cleaning or maintenance of the screen drum is very frequent in actual engineering use.

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