Collecting unit for collecting a substance and method for assembling the collecting unit

A method for assembling a collecting unit for collecting substance, said collecting unit comprises a detachable frame structure and a collector arrangement, the method comprising:

• assembling the detachable frame structure using a plurality of legs and a hub having plurality of holes on a surface, wherein a first end of each of said plurality of legs is inserted in one hole of the plurality of holes, wherein at-least two legs of the plurality of legs is lesser in length as compared to other legs of the plurality of legs, assembling the detachable frame structure further comprises:
• accommodating a leg cord inside each leg from the plurality of legs such that a first cord end of the leg cord is attached to a connector tip, and a second cord end of the leg cord is attached, within the hub, to a second cord end of a leg cord accommodated inside other leg oppositely inserted in the detachable frame structure;
• connecting each corner of a collapsible plane of the collector arrangement with the detachable frame structure using a connecting assembly attached to each corner of the collapsible plane, wherein the connecting assembly is used to establish connection between each corner of the collapsible plane and a second end of each of the plurality of legs such that corners of a first edge of the collapsible plane is connected with the at least two legs of the plurality of legs;
• and
• defining geometry of the collapsible plane using a geometry defining mechanism of the collector arrangement having a first side of the collapsible plane for collecting the substance and a bottom side facing the hub, by establishing connection between a center of the second side of the collapsible plane with the detachable frame structure, for collecting the substance.