At present, there are different controversies and different points of view in the development and application of jet spray technology and technology. The choice of what type of mechanical equipment is beneficial to the smooth development of the ready-mixed mortar industry. First of all, it is necessary to understand the characteristics of different structures, and to Different, according to local conditions, the material, machine, and people organically combined.

Wengong specializes in manufacturing extrusion-type, piston-type, and screw-type mortar spraying machines for more than 30 years. Both of them were technologies for the introduction of Germany's Pursmeister in the 1980s and have so far achieved innovation in China. Different types and structures of products have their own advantages and disadvantages. Here, the main components of various products are analyzed.

One, squeeze pump (hose pump)

Squeeze pumps should be low-cost, low-cost applications. It has not been widely accepted by users in the country, but it is favored in Southeast Asia, Hong Kong and Macao, and developed countries in Europe. The reason is that the domestic market lacks understanding of the technology and fails to understand the new technology and new technology of rubber in China in recent years. Breakthrough and application, in fact, the extrusion pump is mature in construction application technology. In the past, the situation that the extrusion tube was explosive and easy to block and affect the work efficiency and cost has been changed. It has brought a brand-new idea for the mortar spraying application of the extrusion type sprayer. Moreover, the extrusion pump technology has long been applied to concrete transportation abroad.

Second, the piston pump

The piston pump products are divided into S-tube valves and gravity ball valves for distribution and sealing pressure control. S-tube valves are used for long-distance spraying and transportation of premixed wet mixed mortar. Nowadays, high-level mortar spraying and conveying combined work machines and high-rise mortar pump all adopt S-valve valves. The joint-operation machine not only has a mortar conveying capacity of more than 100 meters, but also can be directly used for simultaneous spraying operations. In the “31” heavy industry in our construction machinery industry, we have previously tried to use ball valves for high-level wet-mix mortar spraying, but we have not been able to do so. After the improvement, the S-pipe valve was used to create the first 100 meters of wet-mix mortar directly. The new record of the job. Now "XCMG" also applies gravity ball valve distribution and sealing technology for double-cylinder piston pumps for mortar spraying and transportation. This technology application needs time to look forward to.

The single-cylinder piston pump mortar spraying machine uses the gravity ball valve as the distribution sealing pressure control. Its biggest advantage is that the user's investment and construction cost is low. However, the water retention, cohesiveness, and fluidity of the mortar are relatively high, and the consistency of the mortar is required. Greater than the value of other various spray equipment, especially the relatively strict requirements on the aggregate particle size. Because the single-cylinder piston pump sprayer adopts the gravity ball valve structure as its disadvantage, the sand can easily lift the rubber ball in the working cavity and does not return to the position, resulting in blocking the plugging of the pump. This problem needs to be solved.

Secondly, the double-cylinder and triple-cylinder piston pumps have large pressure and large displacement. Since gravity ball valves are used to distribute and seal control structures, most of them are used in pressure grouting in construction projects.

Third, screw pump

The screw-type pump belongs to a working pump with a rotary internal-meshing displacement principle, and is composed of a stator and a rotor. The rotor is a screw with a large lead, a large pitch and a small thread diameter, and the stator is a double-headed spiral elastic bushing. As early as 1930, the French Monoch invented it, so it is also called the Mono pump. The biggest advantage of this structure is that it allows the pumping of mortar containing particles with a maximum particle size of 5mm, which can deliver various types of mixed mortar in a continuous, uniform and constant volume, with strong self-priming ability, reversible, variable, and mortar. Avoid squeezing during transportation and have high stability. It is widely used in mortar coating, floor construction and wall masonry in the interior and exterior of the project. In recent years, the domestic six ministries and commissions jointly issued a "ban order" (to prohibit the mixing of mortar on the construction site) and promote the impact of ready-mixed mortar, jetting process is becoming more mature, the demand for screw mortar spraying machine is also significantly increased.

However, both the domestic and foreign products, the rotor and stator of the screw pump have the problem of easy wear, which increases the construction cost of the investor, and at the same time causes the construction personnel to add certain troubles and man-hour consumption when disassembling and replacing the screw pump. Obviously, it is imminent to improve the wear resistance of the screw pump. In recent years, in the development of thermal product development, in order to improve the use of the screw pump and prolong its service life, it has taken the lead in using high-speed cutting cemented carbide materials to manufacture rotors. At the same time, it has jointly developed a new process for the production of vulcanized natural rubber with Northwestern Polytechnical University. The wear-resistant stator further improves the quality of the rotor and stator, and achieves the goal of reducing the construction cost of the jet. Secondly, the new screw-type sprayer pump body quick installation structure and the national patented "rotor stator stator separator at the construction site" have been introduced, and a series of technological innovations have been made to promote the improvement of the screw pump technology.

At present, Zoomlion has lived up to the expectations and has continued to innovate and optimize on the basis of the original Motek screw pump technology, and is committed to applying and promoting the application of the screw pump pumping mortar technology.

In summary, with the development of the ready-mixed mortar industry in China and the popularization of machine-spray mortar technology, the demand for mortar spray equipment has become more and more popular. At the same time, the practicality and stability of mechanical equipment are also required. Increasingly high and reasonable selection of equipment has indeed reached the point where everyone needs to be cautious. Of course, it is necessary to select equipment in accordance with local conditions, vary from one material to another, and organically combine people, materials, and machines to achieve reasonable results. The investment will produce good returns.