WO2013170856A2

WO2013170856A2 - Big bag system

Info

Publication number: WO2013170856A2
Application number: PCT/DK2013/050142
Authority: WO
Inventors: Mogens Echberg
Original assignee: Mogens Echberg
Priority date: 2012-05-14
Filing date: 2013-05-14
Publication date: 2013-11-21
Also published as: WO2013170856A3

Abstract

A big bag system (2), in particular for use in connection with handling and firing bulk fuel, for example fuel pellets in the form of wood or straw pellets, and including a trolley (4) adapted for transporting a big bag (6), a discharge funnel (8) preferably disposed at a central depression (10) under an emptying position (12) for the big bag (6), and a conveyor (18) established between the discharge funnel (8) and a firing opening (14) of a pellet burner (16), wherein the trolley (4) includes a lift system (20) for the big bag (6) which is adapted with a central emptying opening (24) in a bottom part (22), preferably with a gate (26), and wherein the conveyor is constituted by a suction conveyor (18) known per se.

Description

BIG BAG SYSTEM

Field of the Invention

The present invention concerns a big bag system, in particular for use in connection with handling and firing bulk fuel, for example fuel pellets in the form of wood or straw pellets and of the kind indicated in the preamble of claim 1.

Background of the Invention

Use of solid fuels in the form of wood or straw pellets are much in the rise, making still greater demands to the development of systems for improving and not the least facilitating the handling of fuel pellets, which of course is also associated with the fact that big bags are increasingly used in the delivery of fuel pellets.

Big bags are generally in use to a rapidly rising extent for delivering almost any kind of bulk material, and the size of the big bags has also increased in recent years, in particular in the case of relatively light materials such as fuel pellets in the form of wood or straw pellets.

This development has caused a particular need for developing new transport systems because even relatively light materials in still larger big bags cause serious handling problems.

CA 2 750 654 Al discloses a transport system particularly for transporting fuel in the form of wood pellets for a pellet furnace, which transport system includes a suction conveyor which via a system of flow and return air lines provide for transport of wood pellets from a storage container to the pellet furnace. Object of the Invention

The invention has the purpose of indicating a new and improved big bag system of the kind mentioned in the introduction and which in a relatively simple way can provide a substantial relief in the handling of e.g. fuel pellets in big bags. Description of the Invention

The big bag system according to the invention is peculiar in that the trolley includes a lift system for the big bag which is adapted with a central emptying opening in a bottom part, preferably with a gate, and that the conveyor is constituted by a pipe conveyor. In a relatively simple way it hereby becomes possible to achieve a substantial relief in handling e.g. fuel pellets in big bags. In this connection this has of course additional significance due to the actual increase in size of the type of big bags for fuel pellets in question. The big bag system according to the invention is suitably designed such that that the trolley is designed with a U-shaped trolley frame provided with one trolley wheel at each their side of an open side, and with a third trolley wheel at a central part of an outer side of the trolley frame opposite the open side. The big bag system according to the invention is, for example, intended for use in connection with a big bag having a square measure of up to about 1200 x 1200 mm and a height until 1500-2000 mm, corresponding to a volume of up to 2-3 m³, which big bag is provided with up to four loop-shaped lift straps, e.g. one at each corner. Alternatively, smaller big bags can have one lift strap which like a carrier bag is connected with opposing sides of the big bag.

In one embodiment of the big bag system according to the invention it is, for example, designed such that the lift system is built up on the U-shaped trolley frame and includes a wire-based lift system with four lifting wires with associated yokes with laterally projecting supports and wire wheels at each corner of a three-sided support frame, a number of wire reversing wheels and a number of winch drums with associated drive system or handles. In a second embodiment of the big bag system according to the invention it is e.g. designed such that the lift system is built up on the U-shaped trolley frame and includes a screw spindle based lift system with a lifting spindle at each corner of a three-sided support frame, as the four lifting spindles carry an upper common support frame with laterally projecting supports, which lifting spindles are arranged in connection with mutually interacting telescopic guide members at the corners of the lift system.

In a third, preferred embodiment of the big bag system according to the invention it is e.g. designed such that the lift system is built up on the U-shaped trolley frame and includes a lift system with a hydraulic cylinder arranged in connection with mutually telescopically interacting four-edges profiles, of which one four-edged profile is connected with an upper, horizontally running member which at both sides is provided with projecting supports adapted to receive respective carrier straps of a big bag.

The big bag system according to the invention is relatively flexible with regard to choice of the integrated transport system between bottom of the discharge funnel and the firing opening as the pipe conveyor can either be constituted by a flexible pipe conveyor known per se with built-in screw conveyor or a flexible suction conveyor known per se.

Alternatively, the big bag system according to the invention can be designed such that the pipe conveyor is constituted by a known pipe conveyor with an endless conveyor wire which in a similarly known way is provided with a large number of disc-shaped carrier means. This type of pipe conveyor is originally developed for transport of portions of pig feedstuff in bulk between a silo and a feeding position.

The big bag system according to the invention is preferably designed such that in connection with the third trolley wheel, the trolley is provided with a pivotably arranged drawbar which, spaced apart from the trolley wheel, is provided with a laterally projecting electric motor having a drive disc which by downwards pivoting of the drawbar is arranged to be pressed against the circumference of the trolley wheel with the purpose of moving the trolley when the electric motor is started. It can furthermore be very expedient that the big bag system according to the invention is designed such that in connection with the third trolley wheel, the trolley is provided with a pivotably arranged drawbar which at opposing sides of the trolley wheel at is pivotably suspended spaced apart from and above its wheel axis, and which has a rearward extension operationally connected with a pivotably mounted friction brake which is adapted to be pressed against the circumference of the trolley wheel when the drawbar is pivoted rearwards/upwards.

Description of the Drawing

The invention is explained more closely in the following with reference to the drawing, on which:

Fig. 1 shows a schematic drawing of the mutual disposition of discharge funnel and pellet furnace; Fig. 2 shows a schematic drawing cf. Fig. 1 with an embodiment of a big bag system according to the invention disposed over firing funnel, as seen from the side;

Fig. 3 shows a plan view of an embodiment of a discharge funnel for a big bag system according to the invention, as seen from a side thereof;

Fig. 4 shows a plan view of an embodiment of a discharge funnel for a big bag system according to the invention, as seen from one end; Fig. 5 shows a plan view of the discharge funnel shown in Fig. 3, as seen from the top;

Fig. 6 shows a plan view of an embodiment of lower part of a big bag with discharge opening with slide gate, as seen from a side thereof;

Fig. 7 shows a schematic drawing of a slide gate in the discharge opening, cf. Fig.

6;

Fig. 8 shows a plan view of a big bag with discharge opening and slide gate according to the invention;

Fig. 9 shows a plan view of a preferred embodiment of a trolley for a big bag system according to the invention, as seen from a side thereof;

Fig. 10 shows a plan view of the trolley shown in Fig. 9, as seen from the top; Fig. 1 1 shows a perspective view of a second embodiment of a trolley for big bag system according to the invention;

Fig. 12 shows a perspective view of a further embodiment of a trolley for big bag system according to the invention;

Fig. 13 shows a plan view detail of a wheel box of a trolley for a big bag system according to the invention, as seen from above;

Fig. 14 shows a plan view detail of wheel box, cf. Fig. 13, as seen from one side;

Fig. 15 shows a plan view of the swivelling wheel with associated drawbar of a trolley according to the invention; Fig. 16 shows yet a detail view of the swivelling wheel with associated drawbar of a trolley according to the invention; and

Fig. 17 shows a plan side view of a trolley with a big bag suspended therein for a big bag system according to the invention. Detailed Description of Embodiments of the Invention

In Figs. 1 and 2 are shown a building plan including a furnace compartment 92 with a pellet furnace 16 and a smoke stack 94 as well as a fuel compartment 96 with a discharge funnel 8 which is disposed in a depression 10 under an emptying position 12 such that a trolley 4 with a big bag 6 can be disposed over the discharge funnel 8. Fuel pellets can be conveyed from the bottom of the discharge funnel 8 to a firing opening 14 of the pellet furnace 16 by means of a pipe conveyor 18, as indicated by dotted line tube 9.

Figs. 3-5 show the discharge funnel 8 as seen in Fig. 3 from the right side on Fig. 5 and seen on Fig. 4 from below in Fig. 5. In Fig. 3 appears that before the discharge funnel 8 there is an air intake slot 98 through which conveying air is supplied to an air pump 100 belonging to the pipe conveyor 18. The air pump 100 is connected with a supply pipe 102 connected with the firing opening 14 of the pellet furnace 16 and a return pipe 104 providing for recycling the conveying air. In an alternative embodiment, the discharge funnel 8 can be designed with so small height that it can be placed upon a floor such that the big bag 6 suspended in the trolley 4 anyway can be brought into position over such a discharge funnel with small height.

Fig. 6 shows a lower part of a big bag 6 which in a bottom part 22 is adapted with a central discharge opening 24 with a gate 26 with a gate slide 27, which e.g. as shown is provided with a cord 29 so that the gate slide 27 from a position at one side of the big bag 6 can be pulled out by pulling the cord 29 for opening the discharge opening 24. Fig. 7 shows a section through the gate 26 and gate slide 27. Fig. 8 shows the big bag 6 shown from below.

The big bag 6 could alternatively be designed with a lower open end which can be closed with a tie such that opening the lower end of the bag is simplified as much as possible.

Figs. 9 and 10 show a preferred embodiment of a trolley 4 which is designed with a U- shaped trolley frame 28 provided with one trolley wheel 30 at each their side of an open side 32, and with a third trolley wheel 33 at a central part 34 of an outer side 36 of the trolley frame 28 opposite the open side 32.

Opposite the central part 34 of the outer side 36 of the trolley frame is provided a lift system 70 with a hydraulic cylinder 72 arranged in connection with mutually telescopically interacting four-edges profiles 74, 76, of which the innermost four- edged profile 76 is connected with an upper, horizontal support member 78 which at both sides is provided with projecting supports 80 intended to receive respective carrier straps 37 of a big bag 6.

Fig. 1 1 shows a modified embodiment of a trolley 106 with a wire-based lift system 38 with four lifting wires 40, the outer ends of which connected to a common yoke 42 with laterally projecting supports 43 and wire wheels 44 at each upper corner 46 of a three-sided support frame 48, as the lifting wires 40 via wire reversing wheels 50 are passed to one or more winch drums 52 with associated drive system or handles 54. Fig. 12 shows a further embodiment of a trolley 108 with a spindle-based lift system 56 with a lifting spindle 58 built into each corner 60 of a three-sided support frame 62. The lift system 56 carries an upper common support frame 64 with laterally projecting supports 66. The lifting spindles 58 are arranged in connection with mutually interacting telescopic guide members 68 at the corners 60. The lifting spindles 58 are interconnected by means of chains 67 and chain wheels 69 which are drivingly connected to a common manual drive system 71 with a handle, or other drive system.

Figs. 13 and 14 show details of a wheel box for a front wheel 30, the wheel box designed at the front with a pointed end 110 such that it is easier to wedge itself to space between corresponding trolleys.

Figs. 15 and 16 show that the third wheel 33 is provided with a pivotably arranged drawbar 82 which, spaced apart from the trolley wheel 33, is provided with a laterally projecting electric motor 84 having a drive disc 86 which by downwards pivoting of the drawbar 82 is arranged to be pressed against the circumference of the trolley wheel 33 with the purpose of moving the trolley 4 when the electric motor 84 is started.

In Fig. 16 it is clearly shown that the drawbar 82 at opposing sides of the trolley wheel 33 at 84 is pivotably suspended spaced apart from the wheel axis 86, and that the drawbar 82 has a rearward extension 88 operationally connected with a pivotably mounted friction brake 90 which is adapted to be pressed against the circumference of the trolley wheel 33 when the drawbar 82 is pivoted rearwards/upwards.

Fig. 17 shows an embodiment of a trolley 4 for a big bag 6 which, for example, can have greater length than width, i.e. one which does not have square cross-dimensions.

In a preferred embodiment, the big bag is designed as indicated in claim 3, namely with a square measure of up to about 1200 x 1200 mm and a height of up to about 1600 mm, corresponding to a volume of until about 2.3 m³, and that the big bag 6 is provided with a loop-like lift strap 37 at each of the four corners.

Claims

1. A big bag system (2), in particular for use in connection with handling and firing bulk fuel, for example fuel pellets in the form of wood or straw pellets, and including a trolley (4) adapted for transporting a big bag (6), a discharge funnel (8) preferably disposed at a central depression (10) under an emptying position (12) for the big bag (6), and a conveyor (18) established between the discharge funnel (8) and a firing opening (14) of a pellet burner (16), characterised in that the trolley (4) includes a lift system (20) for the big bag (6) which is adapted with a central emptying opening (24) in a bottom part (22), preferably with a gate (26), and that the conveyor is constituted by a pipe conveyor (18).

2. A big bag system (2) according to claim 1, characterised in that the trolley (4) is designed with a U-shaped trolley frame (28) provided with one trolley wheel (30) at each their side of an open side (32), and with a third trolley wheel (33) at a central part (34) of an outer side (36) of the trolley frame (28) opposite the open side (32).

3. A big bag system according to claim 1 and 2, characterised in that the lift system is built up on the U-shaped trolley frame (28) and includes a wire-based lift system (38) with four lifting wires (40) with associated yokes (42) with laterally projecting supports (43) and wire wheels (44) at each corner (46) of a three-sided support frame (48), a number of wire reversing wheels (50) and a number of winch drums (52) with associated drive system or handles (54).

4. A big bag system according to claim 1 and 2, characterised in that the lift system is built up on the U-shaped trolley frame (28) and includes a spindle-based lift system

(56) with a lifting spindle (58) at each corner (60) of a three-sided support frame (62), as the four lifting spindles (58) carry an upper common support frame (64) with a laterally projecting supports (66), which lifting spindles (58) are arranged in connection with mutually interacting telescopic guide members (68) at the corners of the lift system (56).

5. A big bag system according to claim 1 and 2, characterised in that the lift system is built up on the U-shaped trolley frame (28) and includes a lift system (70) with a hydraulic cylinder (72) arranged in connection with mutually telescopically interacting four-edges profiles (74, 76), of which one four-edged profile (76) is connected with an upper, horizontally running member (78) which at both sides is provided with projecting supports (80) adapted to receive respective carrier straps (37) of a big bag (6).

6. A big bag system according to claim 1 and 2, characterised in that in connection with the third trolley wheel (33), the trolley (4) is provided with a pivotably arranged drawbar (82) which, spaced apart from the trolley wheel (33), is provided with a laterally projecting electric motor (84) having a drive disc (86) which by downwards pivoting of the drawbar (82) is arranged to be pressed against the circumference of the trolley wheel (33) with the purpose of moving the trolley (4) when the electric motor (84) is started.

7. A big bag system according to claim 1 and 2, characterised in that in connection with the third trolley wheel (33), the trolley (4) is provided with a pivotably arranged drawbar (82) which at opposing sides of the trolley wheel (33) at (84) is pivotably suspended spaced apart from and above its wheel axis (86), and which has a rearward extension (88) operationally connected with a pivotably mounted friction brake (90) which is adapted to be pressed against the circumference of the trolley wheel (33) when the drawbar (82) is pivoted rearwards/upwards.