Conveyor sled assembly
A conveyor sled assembly is utilized to supply proppant in support of oilfield hydraulic fracturing operations. The conveyor sled assembly includes precisely positioned components where tolerances between components are so small as to prevent significant spillage at component junction boundaries. This manner of fitting proppant pods onto the conveyor sled assembly increases predictability of which pods will discharge their proppant load first. This enhances reliability of the overall proppant delivery system.
1. A conveyor sled system comprising:
an elongate frame providing a plurality of individual loading stations along a length of the frame;
a conveyor belt running the length of the frame,
a proppant pod residing on the elongate frame at one of the individual loading stations, the proppant pod being a discrete unit that is selectively removable from the conveyor during normal conduct of a hydraulic fracturing operation,
the conveyor belt being operable for receipt of proppant from the individual loading stations and for delivery of the proppant to a discharge chute,
the conveyor belt having sidewalls with interior partitions that rise upwardly from a loadbearing surface of the conveyor belt;
each of the loading stations having a first gate valve assembly positioned for discharge of proppant into the interior partitions of the conveyor belt,
the first gate valve assembly residing proximate a first gap in close proximity to the upper ends of the interior partitions of the conveyor belt,
the first gap presenting a first tolerance ranging from ¼ to 1/32 of an inch, the first tolerance being effective for preventing spillage of proppant in significant quantities at a lower junction residing below the first gate valve assembly and between the first gate valve assembly and the upper ends of the interior partitions of the conveyor belt.
2. The conveyor sled system of claim 1 , wherein
the first gate valve assembly is positioned on the elongate frame to present an upper junction above the gate valve assembly remote from the lower junction,
the upper junction residing in a position of alignment with a proppant pod when the proppant pod is placed on the elongate frame such that the upper junction resides in close proximity to a discharge opening of the proppant pod across a second gap at the upper junction with second tolerances effective for preventing spillage of proppant in significant quantities through the upper junction.
3. The conveyor sled system of claim 2 , wherein the first and second tolerances range from ¼ to 1/32 of an inch.
4. The conveyor sled assembly of claim 1 wherein the conveyor belt assembly includes a discharge chute and the conveyor belt is operated in a direction that carries proppant from the plurality of individual loading stations towards the discharge chute and through the discharge chute.
5. The conveyor sled assembly of claim 4 wherein the discharge chute is preceded by a rising section of the conveyor belt that is shrouded by a conduit that is configured to mitigate spillage and provide a dust control function.
6. The conveyor sled assembly of claim 5 further including a dolly attached to the elongate frame proximate the rising section of the conveyor belt, and a fifth wheel connector mounted on the frame at a position remote from the dolly, the dolly and the fifth wheel connector providing, in combination, a mechanism for trailerless road transport of the conveyor sled assembly.
7. The conveyor sled assembly of claim 6 further comprising a truck having a fifth wheel assembly built for mating engagement with the fifth wheel connector,
the conveyor sled assembly including an unloading leg
the unloading leg being pivotally mounted to the elongate frame proximate the fifth wheel connector at a suitable position for facilitating mating engagement between the fifth wheel connector and the fifth wheel assembly of the truck,
the unloading leg having a pivotal range of motion permitting the unloading leg to contact a ground surface for establishing ground-based support of the elongate frame on the unloading leg;
there being a selectively extensible cylinder provided for pivoting of the unloading leg according to the pivotal range of motion.
8. The conveyor sled assembly of claim 1 further comprising skirting rigidly affixed to the elongate frame for rigidification thereof, the skirting also being constructed and arranged for purposes of dust control.