Extrustion Blow Molding Machine Blow moulding machines can be divided into three categories: extrusion blow moulding machines, injection blow moulding machines and special structure blow moulding machines. Stretch blow molding machines can be classified into each of the above categories. Extrusion Blow Molding Machine is the combination of extruder, blow molding machine and die closing mechanism, which is composed of extruder and blank die head, blow expansion device, die closing mechanism, blank thickness control system and transmission mechanism. The blank die is one of the important components that determine the quality of blow molding products, usually including the side feed die and the center feed die. The storage cylinder type blank die head is often used for large products during blow molding. The minimum volume of the storage tank is 1kg and the maximum volume is 240kg. The parison thickness control device is used to control the parison wall thickness. The maximum control point is 128 points, generally 20~30 points. The extrusion blow molding machine can produce hollow products with a volume range of 2.5ml~104l. Extrustion Blow Molding Machine,Pe Extrustion Blow Molding Machine,Pet Stretch Blow Moulding Machine,Injection Stretch Blow Molding Machine Ningbo Chenwei Machinery Technology Co.,Ltd , https://www.chenweimachine.com
Injection blow molding machine is the combination of Injection Molding Machine and blow molding mechanism, including plasticizing mechanism, hydraulic system, control electrical apparatus and other mechanical components. Common types include three-station injection blow molding machine and four-station injection blow molding machine. The three-station machine has three stations for preforming, blowing and demoulding, each of which is separated by 120 °. The four-station machine has more pre-forming stations, each of which is separated by 90 °. In addition, there is a dual-station injection blow molding machine with 180 ° between stations. The plastic containers produced by the injection blow molding machine are accurate in size and do not need secondary processing, but the mold cost is high.
The special structure blow molding machine is a blow molding machine that uses sheet, molten material and cold blank as parison to blow mold hollow body with special shape and purpose. Due to the different shapes and requirements of the products produced, the structure of the blow molding machine is also different.
The automatic simulation monitoring system for water balance in the northern part of China passed the acceptance test
[ Instrument Network Instrument Development ] The Key Science and Technology Infrastructure Construction Project of the Field Station of the Chinese Academy of Sciences "Lysimeter Group of Water Balance Automatic Simulation Monitoring System in Northern China" was completed and passed the acceptance on June 30th. This is the first key technology infrastructure construction project completed by the Chinese Academy of Sciences field station network.
After three years of construction, the largest water balance automatic simulation monitoring system in China, the Lysimeter group, was completed at Shapotou Station. The Lysimeter group has 36 large-scale weighing lysimeters (diameter 2.28m, surface area 4m2, depth 3.35m). It integrates mobile greenhouses, intelligent precipitation simulation facilities and groundwater control systems to develop Lysimeter group data management information. system.
The project collected aeolian sandy soil and zonal soil and typical sand-fixing shrubs from four different sand areas in northern China and filled them into large-scale lysimeters to simulate the evolution of sandy land under different climatic zones with precipitation and groundwater level changes, and continuously and accurately monitor vegetation-soil. -Precipitation infiltration, groundwater recharge, soil water dynamics, evapotranspiration, plant growth, etc. in the sand system, through the simulation, monitoring and automatic control of various states and real-time transmission of data, realizing the monitoring and simulation of water balance in the northern sand area -Integrated research has improved the research capabilities of ecological hydrology and ecological physiology and ecology in sandy areas of China, and promoted the integration of hydrology, ecology and biogeochemical cycles.
The completed Lysimeter group is the only system that realizes linkage control of precipitation-groundwater synchronous control, simulation-quantization system control, large light steel structure moving greenhouse and precipitation simulator with 20m span. During the construction and equipment commissioning process, the scientific research personnel obtained a set of test data and equipment parameters, and established engineering construction specifications and technical standards. The acceptance expert group believes that the construction of the Lysimeter group will effectively enhance the research capacity of China's national defense sand control and further promote the networking research of key scientific issues in the northern sand area of ​​China.
The key science and technology infrastructure construction project of the Chinese Academy of Sciences field station is an important facility for the forward-looking layout of the field station construction. It is an important task to enhance the research capability and level of field stations and promote the development of field stations.
(Original title: The first key technology infrastructure construction project completed by the Chinese Academy of Sciences field station network)