Production process system for producing multi-product machine-made sand

Abstract

The invention discloses a production process system for producing multi-product machine-made sand. The production process system comprises a raw material bin, a machine-made sand vertical mill, a combined-type powder concentrator, a vibrating screen, a cyclone and a circulating fan, wherein the raw material bin, the machine-made sand vertical mill and the combined-type powder concentrator are connected in sequence, a bottom discharging port of the combined-type powder concentrator is connected with the vibrating screen, the vibrating screen returns oversize products to the machine-made sand vertical mill, an air outlet of the combined-type powder concentrator is connected with the cyclone, and an air outlet of the cyclone is connected with the circulating fan; and a plurality layers of screens with different pore sizes are arranged on the vibrating screen. The cone angle of each grinding roller of the machine-made sand vertical mill is not larger than 20 degrees, and the total projection area of the grinding rollers on a grinding disc accounts for 20-35% of the area of the grinding disc. A retention ring is a cut-through screening and retention assembly or a cross-type retention ring, auxiliary discharging assemblies arranged on the grinding disc and are located behind each grinding roller in the rotation direction of the grinding disc. By means of the process system, production of the multi-product machine-made sand can be achieved, and scale production is facilitated; and meanwhile, the effect of environmental protection is better, and ultraclean discharge can be achieved.

Description

technical field [0001] The invention belongs to the technical field of vertical mill sand making, and in particular relates to a production process system for producing multi-product machine-made sand. Background technique [0002] With the continuous development of the economy, the awareness of environmental protection has gradually become popular among the people. In the field of building materials, concrete is one of the materials used on a large scale. As the aggregate of concrete, sand and gravel play the role of skeleton in concrete. Aggregate is divided into coarse aggregate and fine aggregate. Coarse aggregate refers to aggregate with a particle size greater than 5mm, mainly natural rock or pebble; fine aggregate refers to aggregate with a particle size below 4.75mm, mainly river sand and machine-made sand. Generally speaking, river sand or machine-made sand is called fine sand according to different particle sizes, 0.075-1.18mm is called fine sand, 1.18-2.36mm is ...

AI Technical Summary

Problems solved by technology

[0005] 1. The content of fine powder (less than 0.075mm) is too high in the manufacturing process, resulting in low sand forming rate, high energy consumption, waste of resources and low efficiency;

[0006] 2. There is accumulation of fine powder in the extension of the grinding disc, which causes excessive grinding in the accumulation area, poor operation stability of the vertical mill, poor equipment reliability, and high frequency of shutdown and maintenance;

[0007] 3. In the existing vertical mill, it can be seen from the drawings that tire rollers are used. There is an upward arc-shaped transition surface on the grinding disc of this grinding structure, which leads to poor fluidity of materials on the grinding disc;

[0008] 4. Does not involve auxiliary discharge, resulting in excessive fine powder content in the machine-made sand

[0009] As a more efficient and energy-saving grinding equipment, it is feasible to produce machine-made sand in principle, but to increase the particle size of the product from less than 0.075mm to less than 4.75mm, it is necessary to redesign the original vertical mill to solve the traditional The problem of high fine powder content, poor product circularity and high production energy consumption in machine-made sand crushing equipment

[0010] In addition, the current machine-made sand production system using crushers has poor sphericity and cannot produce multi-product machine-made sand according to demand (the so-called multi-product machine-made sand refers to a single machine-made sand product with multiple specifications), and dust is collected on site The effect is also poor, and the production is serious, which does not meet the requirements of green production

Images