| 摘要 |
The invention relates to a beam, a manner of securing the arms for supporting mirrors to the beam, a frame and a process for manufacturing the beam of a cylindrical parabolic solar collector. The beam (1) of the frame of a cylindrical parabolic solar collector is characterized in that the beam is cylindrical, hollow and has a circular cross-section; is formed by two or more profile parts or portions (2), with a length equal to that of the beam, with a cross-section in the form of a circular sector with an angle equal to the full angle divided by the number of parts forming the beam, with flanges (3) having a planar area of radial direction at the two ends; the flanges have made therein holes which coincide when they face one another, to allow the assembly of through elements. Said profile portions are made of sheet metal and are attached to one another by contacting the flanges such that a closed profile is formed, thereby forming a full beam. The manner of securing the arms (5) for supporting the mirrors (7) to the beam (1) is characterized in that the arms are assembled to one another in pairs and in turn to the beam (1) with the intermediation of the flanges (3) to which they are secured; the arms of each pair being arranged symmetrically with respect to the flanges and sharing securing elements. The process for manufacturing the profile portions (2) is characterized in that: it starts from a strip of sheet metal with a width equal to the length of the neutral fiber of the profile portion to be manufactured; the necessary holes are punched in the flanges; a profiling machine, also known as a cold profile forming machine, wherein the roller trains give the design shape to the profile portion, is fed with the mentioned strip.
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