Mobile collapsible storage silo

Abstract

A collapsible storage silo having an expanded configuration includes: (a) a shell for circumscribing storage space and comprising a plurality of concentrically nested tubular members that are collapsible; (b) a lift system operable to slidably expand the plurality of concentrically nested tubular members to place the silo in its expanded configuration; and (c) a mast operable to support the lift system. The mast is pivotable between horizontal and vertical positions relative to a frame. A winch attaches to the mast and a cable extends between the winch and an outermost tubular member to expand the silo such that inwardly and outwardly projecting lips of nested members engage each other and a conical hopper engages an innermost tubular member. A flexible inner liner attaches between an outermost tubular member and the hopper. A collapsible roof has a flexible roof membrane and a plurality of radially extending foldable rib members.

Claims

1. A collapsible storage silo having an expanded configuration, the silo comprising: a frame; a mast attached to the frame and being pivotable between horizontal and vertical positions relative to the frame; a shell for circumscribing storage space of the silo, the shell comprising a plurality of concentrically nested tubular members that are collapsible; and a lift system comprising a lift element operatively connected between the mast and the shell so as to be operable to slidably expand the plurality of concentrically nested tubular members to place the silo in the expanded configuration; the mast being operable to support the lift system.

2. The silo of claim 1 wherein the frame includes a plurality of retractable outriggers.

3. The silo of claim 1 wherein the mast is centrally disposed within the plurality of concentrically nested tubular members when the silo is in its expanded configuration.

4. The silo of claim 1 wherein each said concentrically nested tubular member comprises at least one of a lower lip and an upper lip, wherein a lower lip of one of said concentrically nested tubular members and an upper lip of an adjacent one of said concentrically nested tubular members engage each other when the silo is in the expanded configuration.

5. The silo of claim 4 wherein the lower lip is inwardly projecting and the upper lip is outwardly projecting.

6. The silo of claim 1 wherein the lift system comprises a winch attached to the mast and the lift element comprises a lift cable extending between the winch and the plurality of concentrically nested tubular members.

7. The silo of claim 6 wherein the plurality of concentrically nested tubular members comprise an outermost tubular member among the concentrically nested tubular members, and wherein the lift cable extends between the winch and said outermost tubular member.

8. The silo of claim 1 wherein each said concentrically nested tubular member comprises at least one of an inwardly projecting lower lip and an outwardly projecting upper lip, wherein an inwardly projecting lower lip of one of said concentrically nested tubular members and an outwardly projecting upper lip of an adjacent one of said concentrically nested tubular members engage each other when the silo is in the expanded configuration, the plurality of concentrically nested tubular members comprise an outermost tubular member among the concentrically nested tubular members, and wherein the lift system comprises a winch attached to the mast and the lift element comprises a lift cable extending between the winch and said outermost tubular member.

9. The silo of claim 1 wherein the plurality of concentrically nested tubular members comprise an outermost tubular member among the concentrically nested tubular members, the silo further comprising a flexible inner liner attached to said outermost tubular member.

10. The silo of claim 9 wherein the plurality of concentrically nested tubular members comprise an innermost tubular member among the concentrically nested tubular members, the silo further comprising a conical hopper dimensioned for engaging said innermost tubular member when the silo is in the expanded configuration, the flexible inner liner being attached between said outermost tubular member and the conical hopper.

11. The silo of claim 1 comprising a collapsible roof attached to the mast.

12. The silo of claim 11 wherein the collapsible roof comprises a flexible roof membrane and a plurality of radially extending foldable rib members for supporting the flexible roof membrane.

13. The silo of claim 1 wherein the mast is a tubular mast and comprises an auger disposed within the tubular mast, the auger being operable to move granular material along and within the tubular mast.

14. The silo of claim 1 further comprising a control unit comprising a control selected from the group consisting of an electrical control and a hydraulic control.

15. A method of deploying a collapsible storage silo from a collapsed configuration to an expanded configuration, the method comprising: (a) deploying a collapsible roof of the silo; (b) pivoting a mast of the silo to a vertical position relative to a frame of the silo; and (c) when the mast is in the vertical position, operating a lift system comprising a lift element operatively connected between the mast and a plurality of concentrically nested tubular members of the silo so as to slidably expand the plurality of concentrically nested tubular members of the silo, thereby placing the silo in the expanded configuration.

16. The method of claim 15 wherein the lift system comprises a winch attached to the mast and the lift element comprises a lift cable extending between the winch and the plurality of concentrically nested tubular members, the method further comprising operating the lift system by operating the winch until lower and upper lips of adjacent tubular members among the concentrically nested tubular members engage each other and an innermost tubular member among the concentrically nested tubular members at its lower lip engages a hopper attached to the frame.

17. The method of claim 15 comprising deploying the collapsible roof of the silo by: (a) extending foldable rib members of the roof to extend an overlying roof membrane; and (b) locking the roof in a deployed configuration of the collapsible roof of the silo.

18. The method of claim 15 further comprising deploying a plurality of outriggers attached to the frame prior to pivoting the mast.

Description

BRIEF DESCRIPTION OF THE FIGURES

(1) These and other features of the invention will become more apparent in the following detailed description in which reference is made to the appended drawings.

(2) FIG. 1 is a perspective view of a mobile collapsible storage silo in accordance with an embodiment of the present invention shown in a collapsed configuration for transportation;

(3) FIG. 2 is a perspective view of the mobile collapsible storage silo of FIG. 1 shown in a transport configuration with one of the vertical screw systems exposed;

(4) FIG. 3 is a perspective view of the mobile collapsible storage silo of FIG. 1 shown in a deployed operational configuration;

(5) FIG. 4 is a perspective view of the mobile collapsible storage silo of FIG. 1 showing exposed vertical screw systems;

(6) FIG. 5 is a perspective view showing multiple mobile collapsible storage silos of FIG. 1, each in an operational configuration;

(7) FIG. 6 is a perspective view of the mobile collapsible storage silo of FIG. 1 showing the lower material feeding mechanism and chutes for fitting to the input connection of the vertical screw mechanisms;

(8) FIG. 7 is a close-up perspective view of the coaxially nested outer shell sections of the mobile collapsible storage silo FIG. 1 that are attached to the conical bottom section and shown in a collapsed configuration;

(9) FIG. 8 is a close-up perspective view of the base showing the hopper bottom chute mechanism of the mobile collapsible storage silo of FIG. 1;

(10) FIG. 9 is a close-up perspective view of the coaxially nested outer shell sections of the mobile collapsible storage silo FIG. 1 shown in isolation in a collapsed configuration;

(11) FIG. 9a is a close-up longitudinal section of the coaxially nested outer shell sections of the mobile collapsible storage silo FIG. 1 shown in isolation in an extended configuration and showing a detailed view of the connecting feature of the nesting shell sections;

(12) FIG. 9b is a close-up of the connecting features of the nesting shell sections shown in FIG. 9a;

(13) FIG. 10 is a perspective view of the nesting shell sections in a raised configuration of the mobile collapsible storage silo of FIG. 1 with the roof portion removed;

(14) FIG. 11 is a perspective view of the mobile collapsible storage silo of FIG. 1 in which both silo structures are in the deployed configuration but the silo structure on the right is shown with the collapsible nested shell members removed to expose the mast structure;

(15) FIG. 12 is a side view of the mast and collapsible roof structure of the mobile collapsible storage silo FIG. 1 shown in isolation both in a deployed configuration and a collapsed transport configuration;

(16) FIG. 13 illustrates the mast lifting system of the mobile collapsible storage silo of FIG. 1 in three views in which (a) is a longitudinal section of a silo structure showing the tubular members, the mast, the roof structure and the lifting winch system, (b) is a perspective close-up view of the topmost tubular member, the lifting frame and the lift tables, and (c) as a close-up section view showing the topmost tubular member, the lifting frame, lift cables and the winch system;

(17) FIG. 14 further illustrates the mast lifting system shown in FIG. 13 in two views in which (a) is a longitudinal section of a silo structure showing the tubular members, the mast, the roof structure removed, and the exposed lifting winch system, and (b) is a longitudinal section of a silo structure showing the tubular members, the mast, the roof structure and the lifting winch system; and

(18) FIG. 15 illustrates the mobile collapsible storage silo of FIG. 1 in a collapsed configuration for transportation in two views in which (a) the roof system deployed and (b) the roof system is collapsed for transport.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

(19) Referring to FIGS. 1-15, there is shown a mobile collapsible storage silo 100 in accordance with an embodiment of the present invention. Mobile collapsible storage silo 100 comprises a frame assembly 10 on which is mounted at least one collapsible outer silo shell assembly 2 comprising a plurality of concentrically nested tubular shell members 30, wherein each tubular member 30 is received within its adjacent tubular member to enable the silo shell assembly 2 to collapse into itself as shown in FIGS. 1, 2, 4, 6-7 and 9 whereby each tubular member is nested within its adjacent tubular member.

(20) Referring particularly to FIGS. 9a, 9b and 14b, a flexible inner liner 6 is provided within the shell assembly 2 for preventing particulate matter stored within the silo from soiling and interfering with the tubular members 30.

(21) Within the space circumscribed by the outer shell assembly 2 is provided a central mast/loading system 13 that is capable of being raised and lowered at a rotation and locking mechanism 17 pivot. The mast/loading system 13 comprises an elongate tubular housing 32 within which is a screw or auger 25 that is journaled for rotation within the tubular housing 32. As the auger 25 rotates within the housing 32 it moves particulate material along the length of the housing and thereby provides a high-rate loading system by which particulate matter may be loaded into the silo as will be further described. In addition, the mast/loading system 13 also provides an elevating and supporting mechanism for the raising and lowering of the silo shell assembly 2.

(22) Mobile collapsible storage silo 100 further comprises a sloped conical base assembly 12 connected to the frame 10 and having a chute system 18 capable of discharging into at least one conveying system 7 for the discharge of materials from the silos.

(23) Mobile collapsible storage silo 100 further includes a collapsible roof structure 1 that covers the top of the silo shell 2 in the deployed configuration to prevent rain or other debris from falling into the silo structure. The collapsible roof 1 is generally similar in construction to that of an umbrella wherein a flexible roof membrane 34 supported on radially extending foldable rib members 36.

(24) A lifting system is also included, which may comprise a cable winch 38 mounted at the upper end of the mast assembly 13 just below the roof system 1, and the auger drive system 14, such as lower motor 22 and upper motor 26, for rotating the auger 25. Extending from the cable winch 38 are cables 40 which extend downward and attached to the topmost tubular member 19 of the outer shell assembly 2. For example, the lift cables 40 may be attached to a lifting frame 42 that is connected to the topmost tubular member 19. Once the mast system 13 is lifted from the horizontal and secured into the vertical position via the rotation and locking mechanism 17, such that the lower motor 22 engages the lower end 23 of the auger 25, the cables 40, which extend from the lifting winch and connect to the outer shell sections, are spooled in to raise the entire shell assembly to the fully vertical position.

(25) The shell sections or tubular members as shown in FIG. 9b are configured in such way as to allow each tubular member 30 to contact and engage with the tubular member 30 below via overlapping edges 20 and 21. As the topmost tubular member 19 is raised, the lower lip 20 of the topmost member engages with the upper lip 21 of the tubular member below and proceeds to raise and connect each shell member progressively until all shell members are extended upward to a limit provided by the innermost shell's lower lip coming into contact with the conical bottom edge 12.

(26) A fabric or flexible membrane 6 forms a tubular and complete inner liner of each silo shell 2. This tubular liner remains on the inside of the shell sections and is effectively raised and lowered by the same methods as the outer shell. The flexible membrane is attached to the upper rim of the topmost/outer shell member 19 and, at the bottom, to the top of the conical hopper 12 which is attached to the frame assembly 10 via supporting members 3.

(27) Once in the vertical and deployed configuration, the silo unit becomes a rigid structure caused by the resulting tension between the upper end of the mast and the frame assembly 10 provided by the lifting force exerted on the shell sections by the winch lines extending from the lifting system and transferred through the interconnecting shell member lips 20 and 21 and terminating at the top of the conical hopper section 12 and then through the supporting members 3 to the skid base 10.

(28) In the illustrated embodiments, the frame assembly 10 is shown as a skid, but it may likewise be a trailer with wheels, or other movable structure. The frame 10 includes a plurality of retractable outriggers 5 that may be deployed to provide additional stability to the collapsible storage silo structure. The outriggers 5 may deployable by mechanical or hydraulic means as is known in the art. In the illustrated embodiments, the frame 10 supports two silo structures 2 but it will be apparent to persons skilled in the art that other embodiments may have one silo structure, or more than two silo structures.

(29) In the illustrated embodiment, there is also provided a control unit 16 on frame assembly 10 that houses various electric and/or hydraulic controls for the mobile collapsible storage silo 100, such as for example controls for one or more of the mast lifting system, the roof deployment system, the silo shell raising system, the outrigger deployment system, the auger drive system, the material feed systems, and any other electric or hydraulic system provided on the mobile collapsible storage silo. In some embodiments, the controls may be provided in a simple control panel, or they may be dispersed individually at various locations on the mobile storage silo.

(30) The deployment steps of the collapsible storage silo 100 from the collapsed transport configuration are as follows. The outriggers 5 are deployed to provide additional lateral stability to the assembly. The collapsible roof 1 is deployed by extending the foldable rib members 36 to extend the overlying roof membrane 34, and the structure is locked into place. The mast 13 is raised from the horizontal position into the vertical position and locked into place via the rotation and locking mechanism 17. Winch 38 attached to lift cables 40 that attach to the upper ring of topmost/outer shell section 19 are retracted until all shell members are listed resulting in a fully deployed silo shell to as shown in FIG. 3. Particulate material, such as for example fracking proppant, sand, grain, and the like, may then the delivered to inlet hopper 8 of the lower feed conveyors 15, which conveys the material to the inlet of the vertical screw conveyor/mast 13. The vertical screw conveyor receives the material from the outlet of feed conveyor(s) 15 and the screw assembly or auger 25, being driven by drive motors 26 and 22 located at the top and bottom, respectively, of the mast assembly 13 rotate in such a way to elevate the material vertically to the top of the mast assembly 13 where it is discharged from the housing via ports 24. The particulate material then falls to the bottom of the silo envelope/liner 6 and as the cavity is filled and the level moves upward. The materials are contained by the fabric tubular liner 6 and supported by the metal shell sections 2 with the weight being supported by the conical hopper to the supporting members to the frame assembly 10.

(31) Discharge of the material takes place first by the opening of discharge gates 18 allowing material to flow into discharge conveyor(s) 7. When the collapsible storage silos 100 are deployed in multiples, the discharge conveyors 7 may be configured in such a way to be able to discharge at outlet 27 and into inlet 4 of the next unit when deployed in a lineal configuration.

(32) The collapsible storage silo 100 may be configured into the collapsed transport configuration by first emptying the silo structures 2 of all materials. The tension on the winch cables is released thereby lowering the shell sections 30 as per FIG. 1. The masts are then rotated to the horizontal and the roof structure is retracted as per FIG. 1. The collapsible storage silo unit is thus ready for transport.

(33) While specific embodiments of the invention have been described, such embodiments are illustrative of the invention only and should not be taken as limiting its scope. In light of the present disclosure, many modifications will occur to those skilled in the art to which the invention relates, and the invention, therefore, should be construed in accordance with the accompanying claims.