In the past few years, the topics of dumping and transportation that have been repeatedly discussed have become the focus of the industry once again with the official announcement of the first batch of recommended models for road dumping and transportation in the Ministry of Transport. Some people in the industry believe that the shipment of suspension and transportation in 2012 is expected to enter a substantive stage of development.
Hang-and-hung transport, that is to use the front (trailer) trailer trailer to the destination, after the trailer off the trailer, replaced by a new trailer transported to another destination of transport, it set the car train transportation and loading and unloading hanging in one It is a centralized reflection of the organization, scale, networking, informationization, and standardization of the road freight industry. It has matured in developed countries and regions such as Europe and the United States.
According to relevant statistics, after the implementation of drop-and-hook transportation, companies can reduce the purchase cost or rental cost of the front vehicle by more than 50%, increase the average vehicle transportation productivity by 30% to 50%, reduce the cost by 30% to 40%, and reduce fuel consumption by 20% to 30%. . However, this kind of intensive and efficient transport organization model has been developing very slowly in China.
According to an expert who was involved in the development of related standards for dumping and transporting, in 2009, China had a total of 9.07 million trucks in operation, but only 290,000 tractors and only 330,000 trailers, accounting for only 3.2% and 3.6% respectively. . The ratio of the number of tractors and trailers is only 1:1.14. The number of tractors and trailers is small, and the ratio of trailers to trailers is low. Compared with the level of development of suspension of transport by developed countries, there is a significant gap.
At the beginning of January this year, the "Circular on Further Promoting the Healthy and Stable Development of the Road Transportation Industry" issued by the General Office of the State Council proposed that special funds be included in the funds for the purchase of vehicles to support the development of suspension of transportation. According to informed sources, the investment direction of related funds is mainly for large-scale projects and demonstration projects of pilot enterprises and the Ministry of Transport.
According to the "Recommended Types of Road Dropping and Transport Vehicles (First Batch)" formally announced by the Ministry of Transport on January 18th, a total of 16 vehicle models from 11 vehicle manufacturers were selected. Among them, FAW Jiefang, Dongfeng Commercial Vehicles, China National Heavy Duty Truck and Futian Auman have two types of tractors, SAIC Iveco Hongyan and each Beifang Heavy Duty Truck 1 tractors, and others are all dedicated vehicles.
Although people in the industry believe that with the promotion of policies, the development of drop-and-hook transportation is expected to enter the right path, and related beneficiary companies have already “hurryâ€, but in an interview with reporters for a number of heavy truck companies and distributors, most of them are interested in this new policy. The response was dull. Many companies believe that only the recommended models do not implement policy support, and the suspension of the transport trials has little practical effect.
“Without changing the logistics structure, it will be impossible to develop suspension and transportation.†A person in charge of the Brand Department of a heavy truck company believes that the current concentration of the domestic logistics industry is very low, and the industry management is also chaotic. The suspension and transportation needs to be scaled to do it. . The integration process of the domestic logistics industry needs at least five years or more, and it will not have any material impact on the heavy truck companies in the short term.
Relying on its own air distribution system, the compressed air enters the front and rear air chambers of the piston (hammer) alternately, so that the piston reciprocates continuously. The alloy ball teeth break the rock. According to the structural characteristics of the gas distribution system, the DTH hammer is divided into two types: valve type and valveless type. (1) DTH hammer with valve. The air flow is controlled by the valve plate, and can be divided into side exhaust and central exhaust according to the exhaust mode. The side-exhaust valve DTH hammer is the earliest used, and its exhaust gas is discharged from the side of the hammer head. The exhaust gas of the central exhaust valve DTH hammer is discharged from the central hole of the hammer head. In comparison, the effect of removing cuttings by the central exhaust method is good, the service life of the hammer head is long, and the drilling efficiency is high. (2) Valveless DTH hammer. There is no valve plate, and its gas distribution system consists of a group of holes arranged on the cylinder wall, which automatically distributes gas during the movement of the piston. In the total stroke of the piston movement, one section relies on the expansion of compressed air to do work. Under the same pressure conditions, the consumption of compressed air is only 2/3 of that of the valved DTH hammer. According to the working pressure, the DTH hammer is divided into low pressure DTH hammer (0.5~0.7MPa), medium pressure DTH hammer (0.56~1.05MPa) and high pressure DTH hammer (0.56~2.46MPa), which are suitable for different working conditions.
Down The Hole Bits,Dth Hammer,Down Hole Hammer Bits,Down Hole Hammer Drill Bits
Gansu Lanzhou and Wuwei International Land Port Management and Operation Co.Ltd. , https://www.gslwyygs.com