Rotary feeder for granulated bulk material

DESCRIPTION

The invention relates to a compartment impeller gate for bulk granulated merchandise, which is made of a housing containing the compartment impeller in a cylindrical opening, with an intake cassette that ends in an inlet cross section, which , by means of a longitudinal roof-shaped core in its cross-section and with an icy angle path <011 roq.) ocl to the tree) l of the i-oiIoí e of compartments, It is divided into two cross-sectional surfaces of equal length, the longitudinal soul widening in the last zone of the cross-sectional entrance through which the souls of the compartment impeller pass by, so that their lateral edges, first In parallel, they act as deflector edges, which end in sections of the deflector edges of the intake box, similar to each other, which, in plan view from above, they correspond to the V-shaped wings of an arrow indicating the direction of movement of the compartment impeller, extending the sections of the diverting edges, in the inner wall of the cylindrical opening of the housing below the longitudinal core, in a groove about 1.5 times the width and thickness of the maximum grain diameter of the granulate, and the grooves being in the main plane of symmetry of the housing, in anguilla I kill with respect to the impeller shaft of compartments.

From document DE-PS 34 45 710 a compartment impeller gate for bulk granulated merchandise is known, whose casing in the intake case has a longitudinal core, in a roof socket in its cross-section, with an ice-angled path with respect to the ai-bowl of the compartment impeller, which divides the input cross-section into two cross-sectional surfaces of equal length, so that in the compartment impeller chambers, respectively below the longitudinal roof-shaped soul, a hollow slope space is formed. Seen in the direction of travel of the compartment impeller, the longitudinal roof-shaped soul ends on an inclined surface of the intake box, which in turn ends, approximately two diameters of the grain above the ideal envelope surface of the impeller of compartments, in a previous diverting edge, which in the embodiment according to fig. 8, consists of two sections symmetrical with each other, which, in plan view from above, correspond to the two V-shaped wings of an arrow indicating the direction of travel of the compartment impeller. These sections of previous diverting edges are followed, displaced in the direction of travel of the compartment impeller, the corresponding sections of a diverting edge located on the enveloping surface of the compartment impeller, which, therefore, in plan view from It also has the shape of an arrow above which indicates the direction of travel of the compartment impeller. The front diverting edges and the sections of the diverting edges, with the generatrix of the envelope surface of the compartment impeller, comprise an angle that is at least equal to the angle of friction between the bulk material and the material of the gate. This should ensure that that part of the grains of the granulate, which after passing the previous diverting edge, is still in the bag-shaped emptying between said edge and the diverting edge, that is, outside the wrapping surface of the impeller of compartments, is deviated in the hollow space in slope, created previously inside said surface of envelope by means of the soul in the form of roof. In this way the shearing of the grains of the bulk material between the front edges of the front surfaces of the souls of the compartment impeller and the first edge of the gate housing through which said front edges have been rubbing, is largely avoided. in the range of the nominal speed of the impeller of compartments, and a functioning of the gate with little shear is achieved. But if the hollow slope space is observed at a given point in the chamber impeller chamber, said hollow space becomes always smaller, the closer it gets to the V-shaped tip of the diverting edge, on the one hand because the space The hole is filled increasingly by the grains of the granulate already diverted, and on the other hand because the conditions of the slope become more unfavorable, since the V-shaped tip of the deflector edge, seen in the direction of rotation of the compartment impeller, it is already noticeably lower than the highest envelope line of the housing opening. Therefore, the practice has also taught that especially with a decreasing number of revolutions of the compartment impeller, a sufficiently insufficient operation in shears can no longer be ensured. Therefore, this known compartment impeller gate, first of all, is suitable with restrictions for a dosing service that requires a wide range of different speed numbers.

From document DE-PS 40 04 415 another compartment impeller for granulated bulk goods is known, in which a longitudinal roof-shaped soul in the intake box or at the height of the input cross-section is waived and the previous deviating edge does not have an arrow path but parallel to the souls of the compartment impeller. In a configuration of the housing that is similar to that of the gate known by the aforementioned document DE-PS 34 45 710, in the bag-shaped recess between the front diverting edge and the divided diverting edge, a body is provided baffle, which in plan view from above has a substantially V-shaped contour with a tip that indicates against the direction of rotation of the compartment impeller. The deflector body does not extend to the sections of the diverting edges but ends before them, leaving a gap whose width is a muitiplo of the average diameter of the grain of the granulate. Also this gate, in the range of the number of revolutions

EN 2 063 684 A2 nominal of the compartment impeller guarantees a low shear operation, but in any case only on the premise that the degree of filling of the chambers is clearly below 100%, so that a sufficient volume is maintained for the housing of the deviated grains of the granulate. The aforementioned premise is fulfilled in many cases of employment, for example, in operation with a high number of revolutions, with an admission of bulk material previously dosed and / or with a high conlra-pie'úón and a strong current of Leakage air, which results from it, directed in the opposite direction of the admission of bulk material.

The compartment impeller gate of the genre indicated at the beginning has been remarkably used on this side previously and has a housing whose entrance area has characteristics of both the gate according to DE-PS 34 45 710 and also according to the document DE-PS 40 04 415. An operation of this gate, at least quite free of shears, is in any case linked to certain limiting premises. Depending on the respective type of bulk merchandise characterized in particular by its hardness, by its grain shape and by its stacking behavior, as well as depending on the back pressure prevailing on the outlet side of the gates, it could not remain below a certain number of revolutions of the impeller of compartments or so so in the case of an operation with previous dosing.

The invention is based on the mission of creating a ginero compartment impeller gate indicated at the beginning, which works without shears in a wide range of use of bulk goods and operating methods, first of all in the dosing service, with a wide range between the minimum and minimum quantities to be dosed in each unit of time.

This mission is solved in accordance with the invention, because the impeller of compartments, below the longitudinal soul, in each chamber has two spreader separation plates, contained in the radial plane and separated from each other in the width of the longitudinal soul, whose Perimolic edges are on the ideal wrap surface of the compartment impeller, and because the spacer separation plates, in the area of ​​its junction with the respective soul of the rear compartment impeller or that goes there, they have respectively a recess that interrupts the perimitric edge.

By this, since the area of ​​each chamber of the compartment impeller below the roof-shaped soul is free of the bulk merchandise that enters, in any operating condition a sufficient volume is available, in which the grains of the granulate, displaced by the joint action of the leading edge of the soul of the rear compartment impeller of each chamber and of the corresponding flanks of the groove, in the direction of the main plane of symmetry of the housing, they can fall into the separation plates of the chamber through the recesses. Therefore this volume is independent of the properties of the respective bulk merchandise and the operating conditions of the gate. Therefore the gate can start moving without shearing, even from its resting state.

The volume of the space between the chamber separation plates - which eventually reaches the compartment runner aibol must naturally be wide enough to accommodate the maximum number of grains of the granulate diverted or displaced in the direction of the main symmetry plane of the Case. This maximum number of grains of the granulate is fixed by the volume of the grooves in the inner wall of the ai> <- ιΊίira ciiíndirca of the aarcasa. With this, the volume. of the space between the separation plates of the chamber must be at least equal to the volume cited, but is preferably 1.5 to 2 times greater than if by the corresponding measurement of the width of the longitudinal soul and the reciprocal distance of The separating plates of the crab resulting from it, the desired volume is obtained.

Similar considerations can be made (Soltinas the position and the gt'olnclricr form of the recesses in the chamber separation plates, as indicated in more detail in claims 2 to 4.

Under certain operating conditions, for example, with a particularly high number of revolutions of the gate, it may be favorable to arrange the "rear" wall - normally formed by a corresponding section of the soul in question of the compartment impeller - of the space between the plates of separation of the camera displaced relatively with respect to its empties, against the direction of rotation, to further favor the arrow layout of the grooves in the inner wall of the cylindrical opening of the housing. This improvement is directed to claim 5-.

In the drawing is shown simplified esqιlenléltiaullcllte a compartment impeller gate, according to the invention in embodiments chosen by way of example. They indicate:

fig. 1 a longitudinal section, fig 2 a cross section corresponding to the line AA of fig. 1, fig. 3 a cross section corresponding to line BB of fig. 1, fig. 4 a top plan view of the gate according to fig. 1, fig. 5 a half cut corresponding to the CC line of fig. 4, but without impeller compartments, fig. 6 a partial plan view from below, corresponding to arrow X of fig. 1, fig. 7 a cross section corresponding to fig. 3 to lra \ ús. of a second embodiment, fig. 8 a top plan view corresponding to fig. 4 of the second embodiment, and fig. 9 a partial plan view below, corresponding to fig. 6 of the second embodiment.

ES 2 063 684 A2

The compartment impeller gate shown in fig. 1, it has a housing 1, here represented only by its bearing caps, with an intake box 2 and an outlet box 3. In the case 1 there is a compartment impeller, consisting of an orb 4, souls 5 of the impeller of compartments and lateral pushers 4a on both sides, which are however optional. The same compartment impeller gate was represented in figs. two and 3 in cross section corresponding to lines AA or BB of fig. 1. It can be recognized that the housing 1 has a leakage gas purge conduit, which is also optional. The direction of movement or rotation of the compartment impeller was symbolized by an arrow. In the intake case 2, there is a longitudinal core 6 with a straight-angle layout with respect to the shaft 4 of the compartment impeller, which according to fig. one It has a roof-shaped cross section. Said roof-shaped longitudinal core divides the input cross-section into two cross-sectional surfaces 7a and 7b of the same length (compare with Fig. 1). The inlet cross section represents a neck of the shipping surface. 8 of the imitation comparator impeller, which at the same time constitutes the inner wall of the housing bevel in the area of ​​said housing 1.

Each of the chambers limited by the souls 5 of the compartment impeller, is divided, according to fig. 1, by means of two separating plates of the chamber 9a and 9b, which, contained in the radial plane, are exactly arranged below the longitudinal soul 6 and are separated from each other in the width of said longitudinal soul 6 (discounting the thickness of the material of the chamber separation plates). The separator plates of chamber 9a and 9b therefore limit a free space 10 at the beginning of bulk merchandise (compare lambien with fig. 6), which was intended to accommodate the deviated grains of granulate arriving at space 10 through the recesses 11a or 11b at the edges of the perimeter of the separator plates of the chamber, as will be explained below.

As follows from fig. 4, the longitudinal core 6, seen in the direction of travel of the compartment impeller, has parallel lateral edges to approximately the center of the transverse inlet section, but nevertheless widens continuously, so that the corresponding sections of the side edges act there as deflector edges 6a, 6b. These deviating edges 6a, 6b, at points A and B, become, in a small radius, sections 2a, 2b of deviating edges of the admirement box 2, sylclical with each other. These sections 2a, 2b, which, in plan view from above, correspond to the V-shaped wings of an arrow indicating the direction of travel of the compartment impeller, extend into the inner wall of the housing opening, below the longitudinal core 6, in grooves 12a, 12b, which are approximately 1.5 times wider and thicker than the maximum diameter of the granulate and which are located at point C on the main plane of symmetry of the housing , in straight line with respect to the rco 1 <Ί- <ι of compartments. The partial cut indicated in fig. 5 more accurately illustrates the layout of the notches 12a, 12b. This achieves the following: as soon as the intake case, above the cross-sectional surfaces 7a, 7b (fig. 1), it has been filled with the granulate, the soul of the back 5 of the compartment impeller, catching a certain chamber of the compartment impeller, dragging with its previous edge some grains of the granulate, while passing by rubbing the cross section of the entrance. These grains of the granulate, depending on where they are on the corresponding cross-sectional surfaces, are guided either along the diverting edge (6a or 6b) of the longitudinal core 6, or along the corresponding section (2a or 2b) of the deflector edges of the intake box, until reaching the corresponding inflection point (A or B) and there 'are inserted into the corresponding slot (12a or 12b). As soon as now, when the development of the turning of the compartment impeller continues, the emptying (11a or 11b) closest to the respective separation plate of the chamber 9a, 9b, gets to be placed under the groove, the grains of the granulate may fall freely into space 10 between the separator plates of chamber 9a, 9b. Therefore normally no grain of the granulate will reach the inflection point C, where it could be sheared between the section 5a of the corresponding soul 5 of the compartment impeller, which limits the space 10 per det r-ás (compare with fig. 6) and the inner wall of the housing opening.

In this way, the dimensioning 0vtamo of the recesses 11a, 11b is also deduced. The edge of rtrrls of each emptying, seen in the direction of travel, should preferably be in the plane of the leading edge of the corresponding "rear" core of the compartment impeller. In addition, the width of the recesses 11a, 11b, measured in the direction of the peony, should <rVn. be at least equal to the projection of the width of the grooves 12a, 12b on the plane of main symmetry, as without further deduction from fig. 4. The depth of the recesses 11a, 11b, measured in the radial direction of the compartment impeller, must be at least equal to the maximum grain diameter, but on the other hand it should not become unnecessarily large, because then part of the space is it would fill by the bulk metirmivr that enters the lateral chambers.

In figures 7 to that r <esen (iaui. Ι'lniramcnle the variant corresponding to the compartment impeller, of the present proposal in the form of another embodiment. In this case, the central section 5b of the compartment impeller 5, here · in its fnncron as a rear wall or space limiter 10 between the separation plates of the chamber 9a, 9b, esl á. arranged offset against the direction of travel of the compartment impeller by approximately 20% of the width of the chamber measured in the direction of the petmlclfo, discounting the width of the souls, and against the direction of rotation of the compartment impeller. The emptiness situation 11a, 11b, however, remains invariable in this case4

EN 2 063 684 A2 ble. The advantages can be produced, above all, in a very high number of revolutions of the compartment impeller, in which the inertia of the mass of the granulate grains begins to manifest, so that said grains in their broth path that substantially obey the force of gravity, begin to lag behind seemingly behind the turn of the souls of the compartment impeller.

ES 2 063 684 A2