The concrete mixer truck is composed of a special chassis for the vehicle chassis and concrete mixing and transportation. The chassis of the concrete mixer truck produced in China uses the second type of universal chassis provided by the vehicle manufacturer. Its specialized agencies mainly include power take-off devices, front and rear brackets for mixing drums, speed reducers, hydraulic systems, mixing drums, operating mechanisms, and cleaning systems. The working principle is that the power of the chassis of the vehicle is taken out through the power take-off device, and the variable pump of the hydraulic system is driven, the mechanical energy is converted into hydraulic energy and transmitted to the quantitative motor, the motor then drives the speed reducer, and the speed reducer drives the stirring device to perform the concrete Stir. 1. Power take-off device The domestic concrete mixer truck uses the power of the main engine. The function of the power take-off device is to remove the engine power by manipulating the power take-off switch, and the hydraulic system drives the mixing drum. The mixing drum rotates forward during the feeding and transportation process to facilitate the feeding and stirring of the concrete. Rotate and cut off the power connection with the engine after the work is completed.
The engine power taken out by the power takeoff is converted into hydraulic energy (displacement and pressure), and then the motor output is mechanical energy (rotation speed and torque), which provides power for the rotation of the mixer drum. 3. Reducer The speed of the motor output in the hydraulic system is decelerated and transmitted to the mixing drum.
The stirring device is mainly composed of a mixing drum and its auxiliary supporting parts. The mixing drum is a concrete loading container, and the concrete moves in the direction of the spiral of the blades as it rotates, and is subjected to mixing and stirring during continuous lifting and turning. During feeding and transportation, the mixing drum rotates forward and the concrete moves inward along the blades. When the material is discharged, the mixing drum is reversed and the concrete is discharged outward along the blades.
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Aluminum extruded finned tubes using the form of the base tube covered with aluminum tube(the base tube can be carbon steel, stainless steel, copper) through machine extrusion, forming a tube fin, the fin base and the tube outer wall is close fitting, this fin tubing control can make finned tubes with high heat transfer coefficient and heat transfer performance.
Aluminum extruded finned tubes, also called [integral finned tubes" using the form of the base tube covered with aluminum tube(the base tube can be carbon steel, stainless steel, copper) through machine extrusion, forming a tube fin, the fin base and the tube outer wall is close fitting, this fin tubing control can make finned tubes with high heat transfer coefficient and heat transfer performance. Extruded finned tube can be made of iron, copper or aluminum tube by compound rolling, which has the advantages of tight bonding, small thermal resistance, good heat transfer performance, high strength, small flow loss, strong anti-corrosion performance, not easy to deformation under long-term hot and cold working conditions, long working life and so on.
Extruded finned tube manufacturing process
Pipe line--compressing or rolling--strip peeling--washing--pressure test--blast blowing--packaging.
The extruded fin tube is formed by a bimetallic tube consisting of an aluminum outer tube and an inner tube of almost any material. The fin is formed by rolling the material from the outside of the outer tube to provide an integrated fin with excellent heat transfer performance and life. The extruded fins provide excellent corrosion protection for the base tube.
The production method of the composite finned tube mainly includes the extrusion method: the bimetallic composite tube is lined with a mandrel, and driven by the rotation of the roller blade, the composite tube is processed on the outer surface through the cavity formed by the rolling groove and the core head Out fins. The heat transfer tube produced by this method is an organic whole with its outer tube and fins, so there is no problem of contact heat loss, and it has good performance and high heat transfer efficiency.
Extruded finned tube advantage
Compared with the ordinary wound finned tube, the contact thermal resistance remains stable in a large range with the temperature change, so the heat transfer performance of the bimetallic aluminum extruded finned tube is better than the spiral fin tube in the limit tube wall temperature range.
In addition, compared with the coiled tube, the bimetallic aluminum extruded fin tube has outstanding corrosion resistance and high strength, it can withstand 4.0MPa water pressure cleaning, the fins still do not fall down, the base of the bimetallic aluminum extruded tube. The tube can be selected according to the corrosion of the fluid in the tube and the processing technology. The base tube can be carbon steel, copper, stainless steel, etc.
Extruded finned tube applications
Extruded finned tubes are the main equipment for air coolers and are commonly used as heat exchangers in power plants (electric, nuclear, thermal and geothermal). Steam condensate system. Chemical and petrochemical industries. Food processing plants and refrigeration technology. Industry (steel mills, incinerators, gas compression facilities). Petrochemical, power plant and power plant renovation, air conditioning and refrigeration, boilers, finned tube economizers and air preheaters. Maximum working temperature is 280°C-300°C.
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Murphy Thermal Energy Co., Ltd. , https://www.murphyfinnedtube.com