Support apparatus for proppant storage containers
A support apparatus includes a frame assembly with an elevated load surface for supporting a modular proppant container in a position above a ground level. A chute assembly is supported by the frame assembly beneath the elevated load surface. A gate actuator has a coupling configured to engage with a gate assembly of the modular proppant container supported on the elevated load surface and a drive mechanism extending between the frame assembly and the coupling to selectively position the coupling for adjusting the gate assembly. The support apparatus may include a base frame section having a recessed region beneath the elevated load surface providing a feed station, an on-board subsystem attached to the frame assembly for operating the support apparatus in a stand-alone mode or an in-situ weigh station configured to measure the weight of the modular proppant container supported on an elevated surface in the rectangular container bay.
1. A support apparatus for unloading a modular proppant container having a gate assembly comprising:
a frame assembly including an upper frame section having a pair of and a plurality of posts fastened to the upper frame section in spaced relationship and extending downwardly therefrom, the upper frame section having two longitudinal beams and two cross beams forming a rectangular container bay configured to support the modular proppant container in a position above a ground level;
an in-situ weigh station configured to measure the weight of the modular proppant container supported on an elevated surface in the rectangular container bay, the in-situ weigh station including:
a scale located at each corner of the rectangular container bay, each scale including a base plate rigidly attached to the upper frame section and a load cell positioned on top of the base plate;
a weighing platform including an upper plate resting on top of the load cell at each corner of the rectangular container bay and a rectangular frame extending between the upper plate of adjacent load cells; and
a load cell processor configured to receive an input data signal from each load cell representing the vertical load between the base plate and the upper plate, compute a total weight on the in-situ weigh station and send an output data signal representing the total weight;
a chute assembly supported by the frame assembly beneath the elevated load surface, the chute assembly having a funnel section formed by a wall tapering from an inlet at a top of the wall subjacent to the elevated load surface to an outlet below the inlet, a chute section extending downwardly from a first end at the outlet of the funnel section to a second end opposite the first end and terminating at a feed station below the elevated surface; and
a gate actuator including a coupling configured to engage with the gate assembly of a modular proppant container supported on the elevated load surface and a drive mechanism extending between the frame assembly and the coupling to selectively position the coupling for adjusting the gate assembly.
2. The support apparatus according to claim 1 , wherein the rectangular frame of the weighing platform comprises a horizontal flange extending above the longitudinal beams and the cross beams and a vertical flange set inside the upper longitudinal beams and the cross beams, wherein the weighing platform floats on top of the four scales within the in-situ weigh station.
3. The support apparatus according to claim 1 , wherein the in-situ weigh station further comprises a plurality of retainers extending from the weighing platform and configured to engage the upper frame section for preventing the upper plate from lifting off of the load cell when the modular proppant container is removed from the support apparatus.
4. The support apparatus according to claim 3 , wherein each retainer comprises a J-shaped catch extending downward from the rectangular frame beneath at least one of the longitudinal beam and the cross beams to impede upward displacement of the weighing platform when the modular proppant container is removed from the support apparatus.
5. The support apparatus according to claim 3 , wherein each retainer comprises a pin extending downwardly from a bottom of the upper plate and through a hole formed in the base plate and a stop formed on an end of the pin opposite the upper plate to impede any significant upward displacement of the weighing platform when the modular proppant container is removed from the support apparatus.