zhangxiaosan
Legenda soseske
Pridružen/-a: 27.09. 2016, 06:54
Prispevkov: 1069
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 Objavljeno: 02 Dec 2016 07:15 Naslov sporočila: Development of Asphalt Concrete Paver |
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Foreign asphalt concrete pavers
Issue an automatic screed control. It is by moving the hinge point of the traction beam to change the screed position of the screed. As the paver's working width was small during this period, both longitudinal and cross-slope controllers were used for leveling operations. Early semi-automatic leveling system, the system cross slope using automatic adjustment, longitudinal slope using the original hand adjustment device to control; late manual slope adjustment mechanism has also been replaced by automatic devices, there has been automatic ironing control system, the system work The characteristic is relatively perfect, and the leveling effect is good.
How it works: The automatic screed control system consists of sensors, control box, operation panel, the implementing agencies (hydraulic motors or hydraulic cylinder) and other components. Before the paving, first set the required paving thickness, work, the control panel, the longitudinal and slope sensors generate electrical pulse signal and transmitted to the control box, the control box sends an electrical signal to the motor or cylinder to make the appropriate action To change the screed position of the screed, so that is achieved automatically compensate for unevenness of the road base.
Sensor: This period of automatic leveling system used in the regulation of two stages: the initial majority of paver with switch control mode, the sensors are mostly hydraulic follower (ie rotary valve) to open, close and dead zone Three kinds of work in response to grass-roots level of uneven signal; in the late, with the development of electronic sensing technology and extensive application of the gradual emergence of the potentiometer, strain gauge, Hall sensors and other types of sensors, with the corresponding pulse Adjust the way to achieve the proportion of a pulse control.
�� There are many paver production companies abroad, a wide range of functional. Many companies from the early development of a single product to the present, the existing set of production technology to meet a variety of road construction. Based on the application of the automatic leveling system in the paver and the replacement of the mechanical transmission by hydraulic technology, we can understand the development of the paver from three historical stages.
Pavers in the 30's and 50's of the 20th century
This is the first type of asphalt mixture paver, US BLAW2
KNOX, BARBER2GREENE is the representative of the production paver of this period, before
In the early 1930s produced orbital paver, the track as a benchmark to ensure the smoothness of the road; the latter in 1937 launched a drag paver, which consists of traction devices and floating screed device, Simple structure, small size. The performance of the equipment is simple and can not be controlled according to the demand. In the leveling performance, only the leveling property of the floating screed is adopted, and the leveling effect is poor. |
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