A turbulent flow generator circular to square gradient tube and its preparation method and equipment

Abstract

The invention provides a circle-to-square gradual-change tube of a turbulence generator. The circle-to-square gradual-change tube comprises a circular tube section, a transitional tube section and a polygonal tube section; the transitional tube section is connected with the circular tube section and polygonal tube sections which are respectively located at two sides; the section of the circular tube section is a circle, the section of the polygonal tube section is a polygon, and the section of the transitional tube section gradually varies from a polygon to a circle in a direction from the polygonal tube section to the circular tube section; the circular tube section, the transitional tube section and the polygonal tube section are of an integrally connected structure, wherein the polygonal tube section comprises, but is not limited to, a quadrangle, a pentagon and a hexagon. The circle-to-square gradual-change tube is prepared by using a hydraulic pipe contracting machine and at leasttwo sets of rolling pressing wheels. The size and the appearance of the circular-variable square tube are controlled by equipment, the size is uniform, simplicity and groups of rollers, and the sizeand appearance of the circular-variable square tube is controlled by equipment. The size is uniform, convenience and high efficiency are achieved, and the appearance is attractive. The diameter changing place is connected through the transitional section in a gradual-change mode, so that generation of vortex of a slurry flow is reduced, the uniformity degree of the slurry flow is improved, and theservice life is prolonged. The equipment has a simple structure, manufacturing is convenient, mass production can be realized, and cost is saved.

Description

technical field [0001] The invention belongs to the technical field of papermaking equipment, and in particular relates to a round-to-square gradient tube of a turbulent flow generator and a preparation method and equipment thereof. Background technique [0002] The headbox is the device for the pulp on the paper machine to go online. It is the heart of the paper machine. Its unique function is to transform the pulp flow and water flow in the circular tube into a thin and uniform pulp flow covering the entire width of the paper machine. It is required that the fiber suspension does not The structure and performance of the headbox have a decisive effect on the formation of the paper sheet and the quality of the paper. Its main tasks are: (1) It can effectively disperse fibers, and the high-turbulence headbox can generate high-intensity micro-turbulence, which can effectively disperse fibers, prevent fiber precipitation and re-flocculation, and effectively improve the strength...

AI Technical Summary

Problems solved by technology

[0004] like figure 1 As shown, the previous round-to-square tube was fixed by a section of square tube and a section of round tube through the intermediate transition plate, positioned by the mandrel, and welded. The structure is complex, the mass production efficiency is low, the quality needs to be controlled manually, and the appearance is uneven. Qi, increase the production cost, and the variable diameter is a dead angle, not a gradual process, which will cause eddy currents in the slurry flow and affect the uniformity

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