DW single hydraulic prop is a support product of stoping working face developed in the early 1980s, which has been popularized and applied for more than 20 years, and it is a supporting support equipment of high-grade stoping working face. There are two types of DW single hydraulic prop: internal injection type and external injection type. The internal injection type single hydraulic prop relies on the hydraulic oil inside the cylinder to work in the internal circulation, this kind of prop because of its internal structure is complex, the initial support force is small and uneven, the production cost is high, the labor intensity is big and other shortcomings, except for the working conditions such as the point column, generally no longer used, so the use is very small. The external injection type single hydraulic prop relies on the pressure fluid output from the emulsion pump station for initial support. When the roof is pressed or unloaded, the emulsion is discharged into the coal face through the safety valve on the three-use valve or the unloading valve, and the prop drops. When the work is repeated, the pressure fluid of the emulsion pump station is used for the initial bracing and the circulation is in turn. Because the initial support force is supported by the pressure of the pump station, the initial support force of the working face pillar is even, which ensures the roof of the stoping face is smooth and safe, and also reduces the labor intensity of the workers, so the external injection type single hydraulic prop has been widely used. The external injection single hydraulic prop used in China is mainly DW type prop, which is the most used prop product in China. At present, there are more than 50 whole column factories and more than 30 parts factories (such as three-use valves). DW single hydraulic prop specification is not connected to the extension section of the prop, the maximum support height is 630-200mm; With the increase of mining height, DW22 and DW25 struts were developed after welding the extended section on the movable column, and the maximum support height was 2240mm and 2500mm, respectively. With the further increase of the mining height, the extension section of the live column is also impossible to increase too long. Later, the extension section is welded in the lower part of the oil cylinder, and DW28, DW31 and DW35 type pillars are developed. The maximum support height is 2800 mm, 3150 rain and 3500 rain respectively, thus forming the single hydraulic prop series of DW06 - DW35 type. Through the promotion and application of single support equipment and the gradual lengthening of DW single hydraulic prop twice, it is shown that DW single hydraulic prop can be widely used not only on the thin working face of coal seam, but also on the thick working face of coal seam.
In the use of various types of outside type single hydraulic prop are emulsion was used as working medium, because of the technology and economy in our country and the environmental protection consciousness and there are considerable gaps when compared with developed countries, so our country use emulsion as the working medium of individual hydraulic prop are still a lot of use, and also with working face the working environment and groundwater pollution. Although the various types of internal injection single hydraulic prop used in China have solved the environmental problems, but its initial support force is small and uneven, labor intensity is large, and can not be widely used. In order to realize the B2B platform leader of China's industrial and mining equipment industry is now the environmental protection support of underground working surface, China's relevant support researchers have also made a lot of efforts. As our country was born in 1994 in the spiral prop is an example, the note inside the prop is a kind of single hydraulic prop, its structure is simple, low cost, its 5 is used as the working medium of hydraulic oil, hydraulic oil inside the prop to cycle to work, solve the environmental problems, but the initial supporting force are implemented by people with the help of a screw lift, the intensity of labor is larger, so the usage is very few.
Status of DW single hydraulic prop abroad
The overseas props are mainly represented by Germany SS and HS series props and Poland gig-shc external injection props. Over the past 20 years, it has been widely used in Germany, Poland and other places. The piston technology principle, structure and process characteristics, use method and existing problems are basically the same as the external injection single hydraulic prop currently used in China. Precisely, in our country currently used outside type structure and technical principle of single hydraulic prop, are all imported from abroad in the 80 s after digestion, after many years of application and practice, our country has carried on the improvement and development of science and technology, and even some prop products in technology have catch up with and surpass the prop products abroad. Therefore, the technical structure and principle of the props of countries like Germany and Poland are basically at the same level as that of our country. Because Germany and other places have taken some compulsory measures on environmental protection, their use of emulsion as the working medium of external injection single hydraulic prop has been greatly restricted. In order to seek the method of environmental protection type support, also took some measures and methods. Therefore, Germany developed a monomer helical silicone oil prop, which is actually an internal injection type of single hydraulic prop, which uses silicone oil as a liquid spring to maintain a certain constant increase of drag drop, and the initial bracing force is supported by the lifting force of the screw, with great labor intensity.
Shandong China Coal Group is mainly engaged in the production and operation of mining machinery parts, DW single hydraulic prop, machinery equipment, machinery and electrical equipment manufacturing and sales, the company is large, new technology, excellent products, welcome new and old customers to purchase!!
