Multi-pitch square-hole sieve

Abstract

The invention provides a multi-pitch square-hole sieve. The square-hole sieve comprises a platform, a sieve frame, a sieve mesh and a pitch adjusting device; the bottom of the sieve frame is arrangedon the platform; the top of the sieve frame is provided with an upper opening and the bottom of the sieve frame is provided with a lower opening; the diameter of the sieve frame is gradually reduced from top to bottom; the sieve mesh is composed of a plurality of criss-crossing filaments; a plurality of guiding grooves are formed on the four walls of the sieve frame, and the spacing of the adjacent guiding grooves is gradually reduced from top to bottom; both ends of the filaments penetrate through the guiding grooves and are connected to the pitch adjusting device; and the pitch adjusting device is installed on the platform and can adjust the filaments to slide along the guiding grooves. According to the multi-pitch square-hole sieve, square hole pitch can be increased or decreased uniformly through the pitch adjusting device, thus, the square-hole sieve can meet the needs of different pitches in the sieving analysis experiment, and at the same time, the space resources occupied by the allocation of a plurality of square-hole sieves are effectively reduced.

Description

technical field [0001] The invention relates to the technical field of engineering detection, in particular to a square-hole sieve with multiple holes. Background technique [0002] Ordinary concrete is mixed with cement, sand, stones and water in an appropriate proportion, poured into shape, and then hardened to a dry density of 2000-2800kg / m 3 Concrete, referred to as concrete. In concrete, the total content of sand and stone accounts for about 65%-75% of the concrete volume. The sand fills the voids of the stones, together forming a hard skeleton, and can inhibit the shrinkage caused by the hardening and drying of the cement slurry. Sand and gravel are called the aggregates of concrete. [0003] In order to ensure the quality of concrete, the materials used should be selected reasonably. Each component material must meet certain technical property requirements, and its technical properties must also be tested so that it can meet the requirements of concrete and then mee...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the defects in the prior art, the present invention provides a square-hole screen with a multi-hole distance, which solves the problem of the existing square-hole screen, one square-hole screen corresponds to one hole distance, and multiple square holes are required when the multi-hole distance is used. Sieve, very inconvenient technical problem

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