Reusable, flexible, lightweight, low cost flexible intermediate bulk containers (FIBCs) for the delivery of granular proppant material for fracing that will allow the transport of higher weights of proppant, such as sand, per truck load. The invention includes a container made of a high strength, flexible material with a top opening for loading and deploying the proppant. The container can be lifted and deployed with a fork truck or crane. Alternatively, proprietary deployment systems, such as a conveyor system, can be used to quickly and efficiently deploy the proppant from the container at a desired site.

Reusable, flexible, lightweight, low cost flexible intermediate bulk containers (FIBCs) for the delivery of granular proppant material for fracing that will allow the transport of higher weights of proppant, such as sand, per truck load. The invention includes a container made of a high strength, flexible material with a top opening for loading and deploying the proppant. The container can be lifted and deployed with a fork truck or crane. Alternatively, proprietary deployment systems, such as a conveyor system, can be used to quickly and efficiently deploy the proppant from the container at a desired site.

A pivot frame assembly pivotably mountable in a fork-carriage apparatus includes: (a) a lower cross member; (b) an upper cross member; (c) a pair of laterally spaced apart first and second side members connecting the upper and lower cross members; (d) a fork assembly mounting shaft supported by the first and second side members; and (e) a reinforced central support member laterally intermediate the first and second side members and connecting the upper and lower cross members.

A pivot frame assembly pivotably mountable in a fork-carriage apparatus includes: (a) a lower cross member; (b) an upper cross member; (c) a pair of laterally spaced apart first and second side members connecting the upper and lower cross members; (d) a fork assembly mounting shaft supported by the first and second side members; and (e) a reinforced central support member laterally intermediate the first and second side members and connecting the upper and lower cross members.

A fork-carriage apparatus for a lift truck and configured for pulling a load, including: (a) a mounting frame assembly; (b) a side shifter frame assembly slidably mounted to the mounting frame assembly; (c) a pivot frame assembly pivotably mounted to the side shifter frame assembly for translating therewith; (d) a fork assembly mounted to the pivot frame assembly for pivoting therewith; and (e) at least one load-pulling connector mounted to the pivot frame assembly and configured to connect the load to the fork-carriage apparatus for pulling the load.

A fork-carriage apparatus for a lift truck and configured for pulling a load, including: (a) a mounting frame assembly; (b) a side shifter frame assembly slidably mounted to the mounting frame assembly; (c) a pivot frame assembly pivotably mounted to the side shifter frame assembly for translating therewith; (d) a fork assembly mounted to the pivot frame assembly for pivoting therewith; and (e) at least one load-pulling connector mounted to the pivot frame assembly and configured to connect the load to the fork-carriage apparatus for pulling the load.

A pantograph assembly may include a mast carriage assembly comprising a trunnion cross-member and a trunnion shaft coupled to the trunnion cross-member, and a pantograph mechanism coupled to the trunnion shaft.

A pantograph assembly may include a mast carriage assembly comprising a trunnion cross-member and a trunnion shaft coupled to the trunnion cross-member, and a pantograph mechanism coupled to the trunnion shaft.

The present disclosure discloses a hydraulic control system. The hydraulic control system may include a hydraulic module, a PLC control module, a hydraulic valve group control module, a manipulation module, and an action module. The manipulation module is connected with the PLC control module and is configured to input an operation instruction to the PLC control module; the PLC control module is respectively connected to the hydraulic module and the hydraulic valve group control module, and is configured to output a control signal corresponding to the operation instruction to the hydraulic valve group control module, and control the activation of the hydraulic module to provide hydraulic pressure to the hydraulic valve group control module; and the action module is connected with the hydraulic valve group control module, and is configured to perform an action corresponding to the control signal.

The present disclosure discloses a hydraulic control system. The hydraulic control system may include a hydraulic module, a PLC control module, a hydraulic valve group control module, a manipulation module, and an action module. The manipulation module is connected with the PLC control module and is configured to input an operation instruction to the PLC control module; the PLC control module is respectively connected to the hydraulic module and the hydraulic valve group control module, and is configured to output a control signal corresponding to the operation instruction to the hydraulic valve group control module, and control the activation of the hydraulic module to provide hydraulic pressure to the hydraulic valve group control module; and the action module is connected with the hydraulic valve group control module, and is configured to perform an action corresponding to the control signal.