FI12926Y1 - Discharge device for a silo - Google Patents

Abstract

A pivotable unloading device (2) arranged in the silo (1) for transferring the substance stored in the silo at the bottom (3) of the silo towards the outlet (4) in the middle of the silo, the unloading device comprising a pivot frame (5) mounted on the silo bottom (3) to turn around; an unloading screw (6) supported on the pivot frame (5) for rotation about a horizontal longitudinal axis; a drive mechanism (8) for turning the pivot frame (5) and rotating the discharge screw (6), the drive mechanism (8) comprising at least one electric motor (9) and a gearbox (10); and a slip ring package (11) for conducting an electric current to the electric motor of the drive mechanism; wherein the slip ring package (11) is located above the unloading screw (6); and wherein a substantially closed protective cover (12) is arranged above the unloading screw (6) along its entire length, which is supported at one end fixedly on the silo wall structure (7) and at the other end mounted on the top of the pivot frame (5), characterized in that the slip ring package (11) is placed in the space between the protective canopy (12) and the upper part of the pivot frame (5), the outer rings (11b) of the slip ring package (11) being fixed to the non-rotating support (13) of the protective canopy (12) and the inner rings (11a) of the slip ring package (11) 5). In addition, protection requirements 2-8.

Description

BACKGROUND OF THE INVENTION The invention relates to a pivotable unloading device disposed in a silo for transferring material stored in the silo to an outlet in the center of the silo at the bottom of the silo, the unloading device comprising a pivot frame mounted on the silo bottom for pivoting about a vertical pivot axis; an unloading screw supported on the pivot frame for rotation about a horizontal longitudinal axis; a drive mechanism for turning the pivot frame and rotating the discharge screw, the drive mechanism comprising at least one electric motor and a gearbox; and a slip ring package for conducting electric current to the electric motor of the drive mechanism; wherein the slip ring package is located above the unloading screw; and wherein a substantially closed canopy is arranged above the discharge screw along its entire length, which is supported at one end fixedly on the wall structure of the silo and at the other end mounted on the upper part of the pivot frame.

In rotating discharge devices, which are in a silo, the electric current is led by a slip ring package comprising slip rings, which is usually below the discharge screw, by current technology. The material unloaded from the silo then flows through the slip ring package, as can be seen, for example, in FI 114544 and EN

107378. This significantly increases the diameter of the slip ring package, increasing its weight and cost. Another disadvantage of placing the slip ring package under the unloading screw is that it increases the height of the structure below the unloading device.

Some solutions, as seen in U.S. Pat. No. 3,391,809, have a slip ring solution in which the material does not flow through the slip ring package, but in this case the unloading screw cannot dismantle in the 360 degree sector because the support of the slip ring package covers part of the circular sector.

N In current solutions, the drive mechanism with its electric motors and gearboxes generally has to be located below the discharge screw, in which case = the transmission has to be carried out generally by chain drive, as described, for example, in J 4585385 and FI 114544.

E 30 In addition, current screwdrivers leave material at the bottom of the silo - and no solution has been proposed to control the flow through the outlets, cf. publication = US 4701093.

An unloading device of the type mentioned at the beginning is disclosed in U.S. Pat. No. 4,655,666, in which the slip ring package is placed above the unloading screw.

In the solutions described above, the frame structure and the unloading screw of the unloading device become relatively heavy. This structural burden is compounded by the fact that currently the discharge screws are typically directly under the flow of material from the filling, in which case the rotating screw must withstand the pressure of the material of the full silo.

SUMMARY OF THE INVENTION It is therefore an object of the invention to solve the problems described above. This object is achieved by a discharge device according to the invention, characterized in that the slip ring package is placed in the space between the protective roof and the upper part of the pivot frame, the outer rings of the slip ring package being attached to

When the slip ring package is positioned in this way, it allows the disassembly screw gearbox portion to be placed on the disassembly screw shaft, thus avoiding the use of a power transmission chain. At the same time, the entire drive can now be placed in the turntable, so that the drive does not take up space below the bottom of the silo. The power supply from the outside of the silo to the slip ring package can be implemented along the inside of the canopy.

The arrangement of the components of the discharge device according to the invention makes the discharge device lighter and lower and enables energy to be turned and rotated by the discharge screw.

The canopy also allows the discharge screw to be kept below the canopy during the filling phase of the silo and at the beginning of emptying, thus avoiding stresses, especially when filling the silo.

N When the discharge screw is further provided with a support structure extending over its entire length, on which the end of the discharge screw on the wall structure side of the silo is = supported and one end of which is fixed to the pivot frame, this structure extends along its entire length near the bottom of the silo. E 30 as a scraper and allows more accurate emptying of the silo. Support structure - also helps to further lighten the unloading screw.

= Other preferred embodiments of the invention are the subject of dependent claims.

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BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described in more detail by means of a preferred embodiment with reference to the accompanying drawings, in which Figure 1 shows an overview of a silo and a discharge device arranged therein; Fig. 2 shows the unloading device shown in Fig. 1 in section in the lower part of the silo shown; Fig. 3 shows the upper part of the pivot frame in more detail in section above it; Figure 4 shows in more detail the slip ring package shown in Figure 3; Figure 5 shows the lower part of the silo with its discharge devices seen from above; and Figure 6 is a bottom oblique view of the lower part of the silo with its components below it.

DETAILED DESCRIPTION OF THE INVENTION Referring to the drawings, there is shown an embodiment of the invention according to the invention of a pivotable unloading device 2 placed in a silo 1 for transferring material stored in a silo 1 towards the outlet 4 in the middle of the silo.

The unloading device 2 has a cylindrical substantially closed pivot frame 5 mounted in the middle of the silo base 3, which is mounted on its outer circumference on the silo base 3 for pivoting about a centrally vertical pivot axis.

In this pivot frame 5, a release screw 6 is supported to rotate about its horizontal longitudinal axis.

The unloading screw 6 extends radially over the base 3 towards the silo wall structure 7 and, when turned, sweeps over the base 3 when the pivot frame 5 turns it on the surface of the base 3.

During this turning movement, the AN unloading screw 6, while rotating, moves the material on the bottom 3 of the silo towards the bottom 3 and at the same time N towards the above-mentioned outlet 4 in the middle of the turning frame 5. A drive mechanism 8 is provided for turning the pivot frame 5 and rotating the discharge screw 6, comprising at least one electric motor 9 and a gearbox 10. The drive mechanism 8 with its electric motors 9 and gearboxes 10 is known per se and will not be described in more detail here except for its position. = in relation to.

Instead, the invention relates in particular to the arrangement N of a slip ring package 11, by means of which an electric current is conducted to the electric motor (s) 9 of the drive mechanism 8.

Now in this solution according to the invention, the slip ring package 11 is placed above the unloading screw 6. At the same time, above the discharge screw 6, a substantially closed canopy 12 is arranged along its entire length, which is supported at one end fixedly on the silo wall structure 7 and at the other end mounted on the upper part of the turning frame 5. In this case, the slip ring package 11 is placed in the space between the protective canopy 12 and the upper part of the pivot frame 5, the outer rings 11b of the slip ring package 11 being fixed to the non-rotating support 13 to the pivot frame 5 by means of a connecting part 5a. The slip ring principle itself for conducting electricity is known per se, so it will not be described in more detail here. The power supply E from the outside of the silo 1 to the slip ring package 11 can now be realized along the inside of the canopy 12. At the same time, in the filling stage of the silo 1 and in the initial stage of emptying, the discharge screw 6 is located below the protective canopy 12. When the unloading screw 6 is further provided with a support structure 14 extending along its entire length, on which the end of the unloading screw 6 on the silo wall structure 7 is supported and the other end of which is fixed to the pivot frame 5, the unloading screw 6 can be made considerably lighter. In addition, this support structure 14 of the unloading screw 6 extends along its entire length close to the upper surface of the silo bottom 3, whereby at the same time it acts as a scraper of the silo bottom 3 when the unloading screw 6 turns.

Thanks to the new arrangement of the slip ring package 11 described above, the drive mechanism 8 is now also mounted inside the pivot frame 5 at least substantially above the silo bottom 3, the gearbox portion 10a driving the gearbox discharge screw 6 being arranged on the shaft of the discharge screw 6. Now, below the bottom 3 of the silo and its outlet 4, there are essentially no components related to the use of the discharge screw 6 AN, whereby the structure of the discharge device 2 is also optimal for the removal of the substance to be removed from the silo 1. Preferably, in the silo bottom 3, between the discharge opening 4 30 located in the middle of the silo base 3 and the silo wall structure 7, discharge openings 15 smaller than the discharge opening 4 and conveyors 16, 17 below the silo bottom are further arranged for conveying the material from the discharge openings 15. The conveyors comprise screw conveyors 16 and at least one conveyor belt 17 which receives the material brought in by the screw conveyors 16. When the silo 1 is emptied, the substance there flows from the discharge openings 15 of the silo S 35 to the screw conveyors 16, which control the discharge speed. Municipality-

When the so-called natural emptying ends when the silo 1 is emptied, the use of the discharge screw 6 begins. The above description of the invention is only intended to illustrate the basic idea according to the invention. Its details can be implemented within the scope of the accompanying protection requirements. o

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Claims (8)

Protection requirements A pivoting unloading device (2) placed in a silo (1) for moving material stored in the silo on the bottom (3) of the silo in the direction of an outlet opening (4) in the middle of the silo, the unloading device comprising a pivoting frame (5) which is mounted centrally with the support of the bottom of the silo (3) for pivoting about a vertical axis of rotation; a discharge screw (6) supported in the pivot frame (5) for rotation about a horizontal longitudinal axis; an operating machinery (8) for pivoting the pivot frame (5) and rotating the discharge screw (6), which operating machinery (8) comprises at least one electric motor (9) and a gearbox (10); and a slip ring package (11) for conducting electric current to the electric motor of the operating machinery; wherein the slip ring package (11) is located above the discharge screw (6); and above the discharge screw (6) is arranged over its entire length a substantially closed protective roof (12), which from its one end is fixedly supported in the wall construction (7) of the silo and from its other end is mounted at the upper part of the pivot frame (5), and characterized in that the slip ring package (11) is located in a space between the protective roof (12) and the upper part of the swivel frame (5), the outer peripheries (11b) of the slip ring package (11) of the slip ring package (11) being attached to the non-rotating support (13) and the inner peripheries (11a) of the slip rings of the slip ring package (11) are attached to the rotating pivot frame (5). Unloading device according to protection requirement 1, characterized in that the supply of electricity (E) from outside the silo (1) to the slip ring package (11) is carried out along the inner side of the protection roof (12). ? Unloading device = according to - protection requirement 1 or 2, 9 30 characterized by the filling phase of the attisilons (1) and at the beginning of the emptying the E discharge screw (6) is located below the protective roof (12). Unloading device according to one of the preceding protective claims, characterized in that the drive machinery (8) is located inside the swing frame (5) N at least substantially above the bottom (5) of the silo, the gearbox section (10a) S driving the gearbox screw (10) discharging screw (10) 6) is located on the shaft of the discharge screw (6). Unloading device according to one of the preceding protective claims, characterized in that the discharge screw (6) is equipped with a support structure (14) extending over its entire length, in which the end of the discharge screw located on the side of the silo wall structure (7) is supported and each other end is attached to the swing frame (5). Unloading device according to protection requirement 5, characterized in that the support structure (14) of the discharge screw (6) extends over its entire length in the vicinity of the surface of the bottom (3) of the silo and then functions as a scraper for the bottom of the silo. Unloading device according to one of the preceding protection claims, characterized in that unloading openings (15) which are smaller than the outlet opening, (4) are arranged at the bottom (3) of the silo between the outlet opening (4) in the middle of it and the wall construction (7) of the silo. and conveyors (16, 17) located below the bottom (3) of the silo for transporting the material coming from the unloading openings (15). Unloading device according to claim 7, characterized in that the conveyors comprise - screw conveyors (16) and at least one conveyor belt (17), which receives the material which the screw conveyors (16) carry with them. N O N <+ IN O I a a ~ 3 O N O N> ”