At present, jet technology and process in the promotion of the application of different disputes and different points of view, the choice of which structure of mechanical equipment is conducive to the development of the ready-mixed mortar industry, first of all must understand the characteristics of its different structures, different from the machine, according to local conditions, the material, machine, people organic combination. Shandong China Coal Group is specialized in manufacturing extruded, piston and screw mortar spraying machines with a history of more than 30 years, all of which are technology introduced from Germany's pusmeister in the 1980s, and have realized Chinese innovation till now. The products of different types and structures have their own advantages and defects.
1. Piston pump
Piston pump products are divided into s tube valve and gravity ball valve for the distribution of sealing pressure control, pipe valve is used in the wet mix mortar long-distance spraying and delivery. Now the high-rise mortar spraying, conveying combined operation machine and high-rise mortar conveying pump are all using S tube valve, the combined operation machine not only has more than 100 meters of mortar conveying capacity, and can be directly used for simultaneous spraying operations. In our construction machinery industry, sany heavy industry has tried to use ball valves for wet mixed mortar spraying, but failed, after the improvement of S tube valve first created a new record of wet mixed mortar spraying above 100 meters. Now "XCMG" also in the double cylinder piston pump application of gravity ball valve distribution sealing technology for mortar spraying, conveying, the application of this technology still need time to look forward to.
2, screw pump
Screw pump belongs to the rotary internal meshing volumetric principle of the working pump, composed of stator and rotor, the rotor is a large lead, large tooth pitch and small thread inner diameter of the screw, and the stator is a double-headed helix of the elastic bushing, the structure as early as 1930 invented by the French mono, so also known as mono pump. The biggest advantage of this structure is that it allows the mortar with particle size of up to 5mm to be pumped, and it can continuously, uniformly and volumetrously transport all kinds of mixed mortar. At the same time, it has strong self-absorption ability, reversible and variable, so as to avoid extrusion and achieve high stability in the conveying process of mortar. It is widely used in mortar spray coating, floor construction and wall laying technology of engineering interior and exterior walls in foreign countries. In recent years, under the influence of "ban on cash" issued by six ministries and commissions and promotion of premix mortar in China, the machine spraying technology is increasingly mature, and the demand for screw mortar spraying machine is also significantly increased.
However, regardless of domestic and foreign products, screw pump rotor and stator are easy to wear problems, the corresponding increase in the investor's construction costs, at the same time, so that the construction personnel in the demolition and replacement screw pump to increase the trouble and time consumption. Visible, improve the screw pump wear resistance is imminent, no delay. In spin cheong product development achievements in recent years, in order to improve the use effect and prolong the service life of screw pump, pioneered in high speed cutting carbide materials rotor, at the same time and the northwestern polytechnical university to jointly develop new technology of vulcanized natural rubber, high wear resistance of the stator, further improve the quality of the rotor and stator, and realized the purpose of reducing machine spray construction cost. Introduced a new screw sprayer pump screw pump rotating body rapid installation structure and has been granted the national patent "construction site rotor stator separator" and a series of technical innovations, promoting the promotion of screw pump technology.
At present, shandong coal group lives up to expectations, on the basis of the original m-tec screw pump technology, continuous innovation, continuous optimization, is committed to the application and promotion of screw pump jet mortar technology.
To sum up, with the development of the ready-mixed mortar industry in China, the popularity of slurry injection technology, the demand for cement mortar machine spray equipment is more and more popular, at the same time, the practicability and stability requirements for mechanical equipment is becoming more and more high, choose equipment reasonably, adjust measures to local conditions, owing to the different materials, people, material, machine together organically, to achieve a reasonable investment, produce good benefits in return.
Extrusion pump should belong to low investment, low cost in the application of the product, but in China has not been widely accepted by users, and in southeast Asia, Hong Kong and Macao regions and developed countries in Europe quite popular. Investigate its reason, the domestic market lacks the understanding of the technology, failed to understand in recent years due to the application of new techniques, new technologies of rubber mixing, extrusion pump on the construction technology is ripe, so before extruded tube and explosive easy plugging and affect the status of the construction efficiency and cost have been changed, extrusion type sprayer for mortar spraying application has brought a new idea. At present, extrusion pump technology has been applied to concrete conveying in foreign countries.
