A continuous clay sand mixer

Abstract

The invention belongs to the technical field of sand mixing equipment and relates to a continuous clay sand mixer. A new and old sand bin, a bentonite bin and a pulverized coal bin are arranged above a comprehensive charging hole, a moisture detector connected with a PLC control unit in an electric information mode is arranged under the new and old sand bin, and online detection of moisture of new and old sand before sand mixing can be achieved; after a human-machine control interface presets raw material parameters, the PLC control unit is used for analysis and calculation to control operation of a water pump frequency converter, a bentonite spiral feeding frequency converter and a pulverized coal spiral feeding frequency converter, and water, bentonite and pulverized coal are continuously added to a mixing cage in real time in an online and quantified mode; a return bin with a discharging mechanism is arranged under the mixing cage, so that mixed moulding sand is conveyed to the next production link; the mixer is simple in structure, reasonable in design, scientific in principle, simple in operation, high in sand mixing efficiency, good in sand mixing effect and good in finished product performance, the production efficiency is improved, and production cost is lowered.

Description

Technical field: [0001] The invention belongs to the technical field of sand mixing equipment, and relates to a continuous clay sand mixing machine, which can detect the moisture in the raw sand on-line before sand mixing, and perform bentonite, coal powder and water in the sand mixing process according to the detection results. Carry out continuous real-time quantitative addition. Background technique: [0002] The molding sand used for molding in casting is generally made of molding materials such as casting raw sand, molding sand binder and auxiliary additives in a certain proportion. According to the different binders used, the molding sand can be divided into clay sand and water glass sand. , cement sand and resin sand, among which clay sand, water glass sand and resin sand are more widely used. Usually, molding sand requires high strength and thermal stability, good fluidity, plasticity, air permeability and collapsibility; With the continuous improvement of productio...

AI Technical Summary

Problems solved by technology

[0002] The molding sand used for molding in casting is generally made of molding materials such as casting raw sand, molding sand binder and auxiliary additives in a certain proportion. According to the different binders used, the molding sand can be divided into clay sand and water glass sand. , cement sand and resin sand, among which clay sand, water glass sand and resin sand are more widely used. Usually, molding sand requires high strength and thermal stability, good fluidity, plasticity, air permeability and collapsibility; With the continuous improvement of production automation in the field, the quality requirements for molding sand are also getting higher and higher. At the same time, in response to the national call for energy conservation and emission reduction, it is urgent to improve the existing high energy consumption and low efficiency sand mixers. The traditional intermittent The time required for feeding and unloading the sand mixer is about 30-50 seconds, which greatly reduces the production efficiency per unit time, and is not conducive to the application in the molding sand processing system with a high degree of automation; Although several types of continuous sand mixers reduce energy consumption and production costs to a certain extent, the molded sand prepared has poor fluidity, and online continuous real-time detection and water addition cannot be realized during the preparation process, and different proportions cannot be performed without stopping the machine. The formula ratio of sand is changed. For example, a continuous sand mixer disclosed in Chinese patents 2009101830530 and 2009202343570 is suitable for mixing self-hardening resin sand. The conveying device in the traditional sand mixer is improved to better realize the opposite casting Conveying and mixing of sand; Chinese patents 2011102471231 and 2011203138477 disclose a continuous clay-sand sand mixer, which can complete continuous clay-sand sand mixing, but the control of molding sand moisture cannot realize continuous real-time online detection and addition; therefore Seek to design a new type of continuous clay-sand sand mixer, which can change the formula ratio at any time in a short period of time without stopping the operation when mixing different clay, water, and coal powder ratio sands; mixing The molding sand has good fluidity and plasticity, and is suitable for sand used in the molding process of automatic molding machines; the streamlined structure design effectively reduces power consumption, and the energy consumption is only 1 / 3 to 1 / 4 of the intermittent sand machine with the same capacity. Good economic value and social benefits

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