Development status and trend of domestic stabilize

2022-07-30
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Development status and trend of domestic stabilized soil mixers introduction: the production and sales of stabilized soil mixers in China have shown a downward trend in recent years, and the market has shrunk seriously. The annual demand for stabilized soil mixers has decreased from 500 ~ 600 units in previous years to less than 100 units. What is the reason for the continued downturn in the market? What is the way out for stabilized soil mixer? Where is the breakthrough? These problems deserve deep reflection in the industry

the production and sales of stabilized soil mixers in China have shown a downward trend in recent years, and the market has shrunk seriously. The annual demand for stabilized soil mixers has decreased from 500 ~ 600 units in previous years to less than 100 units. What is the reason for the continued downturn in the market? What is the way out for stabilized soil mixer? Where is the breakthrough? These problems deserve deep reflection in the industry

1. Misunderstanding of the concept of stabilized soil mixer

in the road machinery industry, Conceptually speaking, stabilized soil mixer is mainly used for the construction of new road pavement base. It belongs to the category of road construction machinery, and is very similar to the road cold regeneration machine in terms of machine structure and function. It is a kind of two configurations or usages for setting up shifts and scoring and evaluating shifts. At present, the international market of single purpose stabilized soil mixer is very small. In foreign countries, this kind of machinery is generally named jointly, which is called Road stabilized soil mixer/road regenerator. However, in China, this single-purpose stabilized soil mixer is formed without necessary auxiliary material adding devices, which greatly limits the use space and market of stabilized soil mixer

stabilized soil mixer and road milling machine are two different models. Generally, stabilized soil mixer is mainly used for pavement base operation, and sometimes also includes surface course. The purpose of material cutting is to mix the paving material with the stabilizer, and the cutting and mixing depth is 300 ~ 400mm; The main working object of the milling machine is the road surface. The main purpose is to remove the road surface materials. The milling depth is less than 100mm, and then the materials are transported away for recycling. Generally, the milling machine is equipped with a recycling device. The difference is that the stabilized soil mixer is generally used for the construction of new roads, while the milling machine is generally used for the overhaul of roads. The milling machine requires high cutting precision, so the two machines are different in overall structure. Although some manufacturers in China publicize that the milling rotor installed in the mixer produced by themselves can be used for road milling, due to the structural limitations of the mixer, the milling and cutting accuracy is too low, and no construction unit will use it in the maintenance of grade highways

to sum up, the stabilized soil mixer and the road cold regenerator should be classified as one product. The road cold regenerator is a stabilized soil mixer equipped with a filling agent supply device, which can be used as an optional equipment of the stabilized soil mixer. Of course, the stabilized soil mixer can be equipped with mixing rotors of various tools, such as hoe shaped tools (also known as ship slurry type tools), bullet shaped tools, etc, It can be used for mixing materials with different hardness, and even mixing old pavement for road regeneration

2. Development history of stabilized soil mixers in China

stabilized soil mixers in China started in the late 1980s. At that time, there were two types of stabilized soil mixers in the world. One was a medium horsepower stabilized soil mixer represented by Japanese companies such as Niigata. The engine power was about 149kw. The mixing cutter was of sheet structure. The mixing rotor was mechanically driven and driven by chains on both sides to mix; One is the high-power full hydraulic stabilized soil mixer represented by German BMW. This mixer adopts high-grade hydraulic components and has advanced performance, representing the development trend of stabilized soil mixer in the world. Both types of mixers are imported in a small amount in China. However, due to the limited understanding of stabilized soil mixers in China, China only focuses on the latest international development technology trend, and does not properly develop medium and small power stabilized soil mixers according to China's national conditions, which makes the development of stabilized soil mixers one-sided. At that time, some Chinese manufacturers, such as luojian and Shaanxi Huashan, used the technology of BMW high-power full hydraulic stabilized soil mixer for reference, and developed a post mounted full hydraulic stabilized soil mixer with mixing device of about 224kw in China through surveying and mapping. Later, with the improvement of highway construction requirements, the stabilized soil mixer of 269kw or even more than 298kw was developed successively. After 2000, the central mixer was trial produced. In recent years, the road cold recycling machine was developed. Later, some other domestic construction machinery manufacturers followed suit. At the peak, more than 10 manufacturers produced more than 20 types of stabilized soil mixers

3. Reasons for the shrinking of the stabilized soil mixer Market in China

first of all, the stabilized soil mixer on the market in China generally has a power of more than 224kw, and most of them adopt full hydraulic transmission, i.e. hydraulic walking transmission, hydraulic working transmission, rear mounted working device, without filling and dosing supply device. The performance of this stabilized soil mixer can not meet the needs of high-grade highway construction. When stabilized soil mixers are used for mixing, the proportion, particle gradation and water content of the mixing materials cannot be accurately controlled after excluding the impact of exchange losses (tax deduction) from business and financing activities, which is not comparable to stabilized soil plant mixing equipment. However, the evenness, flatness and compactness of the pavement after mixing and forming by road mixers are not comparable to stabilized soil pavers. In addition, domestic stabilized soil mixers are driven by full hydraulic pressure, and product failures occur frequently, The product quality reliability is too low. The stabilized soil mixer has a single function, short service time and low machine utilization rate. It is generally resisted by the road construction department with the largest use of stabilized soil mixer. Instead, stabilized soil plant mixing equipment is used. In addition, the construction technology of highway pavement base with stabilized soil paver makes the stabilized soil mixer lose a huge market and user

secondly, for low-end users such as county and township roads, the price of China's high-power full hydraulic stabilized soil mixer is high, and the use cost is too high. As all stabilized soil mixers in China adopt hydraulic traveling transmission, hydraulic working rotor transmission, high-power international brand diesel engines, and the main components are imported directly from abroad, the manufacturing and production cost of the machine is too high. The price of a complete mixer often reaches 700000 ~ 800000 yuan, and some even millions, which seriously deviates from the value of the product and its object of use. On the one hand, the vast county and township roads urgently need this kind of equipment to realize the mechanization of road construction. On the other hand, this product makes users "look at the machine and sigh" because of its high price. In addition, the dust and lime flying caused by the on-site mixing of the stabilized soil mixer and the poor construction site environment are also important reasons why users do not accept this equipment

at present, the stabilized soil mixer is only used in a small amount on highways and some low-grade highways or auxiliary highways of municipal construction departments

4. The way out and Development Countermeasures of stabilized soil mixer in China

domestic stabilized soil mixer must develop on two legs, one is to take the road of high-power and high-performance stabilized soil mixer/regenerator, the other is to develop a mechanically driven stabilized soil mixer/regenerator that meets the national conditions of China for small and medium-sized users and county roads

it should be said that there is still a certain market for the development of high-power and high-performance stabilized soil mixer/regenerator, but users have higher and higher requirements for the performance and quality of this type of machine, which requires relevant manufacturers to make great efforts to develop and tackle quality problems. The author believes that the central stabilized soil mixer/regenerator should be designed and developed. The central stabilized soil mixer has the characteristics of good stability during mixing and high flatness of stabilized soil. Equip the machine with additive spraying device, including water and emulsified asphalt, and study the mixing/regeneration process to achieve the best mixing quality. At the same time, the reliability of the stabilized soil mixer is emphatically solved. Although the sales volume of this product is not very large, the manufacturer should not do nothing because of its small profits. Some characteristics of the stabilized soil mixer/regenerator are unmatched by other products. Compared with other operation modes, this type of mixer/regenerator can save a lot of transportation costs and reduce construction costs. Although the sales volume is small, the profit margin of high-performance products can be very high. This requires powerful enterprises to enter, solve the problem of product reliability, master key technologies through product experimental research, and improve the working performance and operation quality of the machine

at present, the largest market of stabilized soil mixer in China is the construction of rural county and township roads. In recent years, the state has increased investment in county-level rural roads. According to the rural road construction plan of the Ministry of communications, the country will invest 418.7 billion yuan during the "Eleventh Five Year Plan", so that the total mileage of county-level rural roads in China will reach 3.1 million km in 2010 and 3.7 million km in 2020. " During the 11th Five Year Plan period, 300000 km of county and township roads will be newly built and 1.2 million km of reconstructed roads will be built, so that all towns and villages in China will be paved with asphalt or cement pavement. The huge market will certainly need a large number of machinery and equipment suitable for rural road construction

the author believes that the configuration principles suitable for rural road construction machinery in China are: (1) the requirements of road construction and technical standards must be met. (2) Alternative machinery is not encouraged. (3) Properly reduce the specification of mechanical equipment. Relevant professionals put forward the basic configuration of construction machinery for rural roads in China, especially the development of 74.6 ~ 134kw medium-sized stabilized soil mixer. However, there is no stabilized soil mixer of this specification in China at present. It is an urgent task for the pavement machinery industry to develop road construction and maintenance machinery including mixer/regenerator suitable for county and township roads, so there are huge business opportunities

5. Market demand for agricultural mixer/regenerator

rural roads are an important part of national roads and the infrastructure for the development of rural local economy. However, at present, the development status of rural roads in China is still far behind the overall development level of national transportation. There are a series of problems such as poor baseline shape, low pavement grade, and difficult to regularize and standardize maintenance operations, resulting in a considerable number of rural roads being overloaded in the "sick" state. Most of the branch roads for mines and tourism in China are in rural counties and townships. Rural roads are used for the shipment of mineral products and the import and export of tourism routes. However, the load of large heavy-duty mines and large tourism vehicles often greatly exceeds the design bearing capacity of the road, resulting in frequent damage to many road sections. A large number of subsidence, cracks and other diseases have occurred in some roads within one year of opening to traffic. Due to the untimely maintenance and treatment, the whole road section has been basically damaged in less than 2-3 years and can not be used normally. This phenomenon is common in many areas of China

the biggest reason for the early failure of county and township roads in China, especially rural roads, is that the subgrade is not stabilized. Some asphalt pavements are simply compacted on the subgrade and then paved with crushed stone layer as the seepage layer, and then paved with asphalt. Many rigid cement concrete pavements are simply paved with cement concrete after the subgrade is formed. In this way, the road settlement, water immersion and cracking can be found everywhere due to the instability of the pavement base, and the lack of appropriate equipment is an important reason for this phenomenon. At present, there are several methods for pavement base treatment of county and township roads: (1) the subgrade is not subject to stabilization treatment, but only to general compaction treatment after the foundation is completed. This phenomenon is common in rural roads. Obviously, this method can stabilize the road subgrade

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