SU30143A1 - Device for securing sieves on vibrating screen - Google Patents

Description

The proposed device for fixing the sieve on the vibrating screen is intended to provide such a design of the screening device in which the entire surface of the sieve can be brought into a state of uniform swing. The second object of the invention is such a device in which the sieve has a very high mobility and elasticity so that the oscillatory movements it is given can be fully utilized.

In FIG. 1 is a side view of a wedge device equipped with devices according to the invention; FIG. 2 is a sectional view taken along line 2-2 in FIG. one; FIG. 3 is a top view of the sieve and the surrounding frame; FIG. 4 is a side view of the parts shown in FIG. 3; FIG. 5 is a schematic explanation of the surface movement of the sieve in the devices shown in FIG. 3 and 4; FIG. 6 is a top view of the device in which the method of reinforcing the sieve is modified; FIG. 7 is a side view of the parts shown in FIG. 6; FIG. 8 is a schematic explanation of the movement of the screen in the device shown in FIG. 6 and 7; FIG. 9 is a section through the fastenings of the end of the sieve shown in FIG. 7 on the right side;

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FIG. 10 is a top view of a second modified frame structure for reinforcing the sieve; FIG. 11 is a side view of the portions shown in FIG. ten; FIG. 12 is a side view of part of one of the structures of the sifting device, in which the sieve is reinforced according to FIG. 6 and 7; FIG. 13 shows the upper end of the device according to FIG. 12.

The device (Fig. 1 and 2) consists of two mutually parallel inclined channel beams 7 and 2 located at a known distance from each other, the ends of which are fixed on supports 3 vi 4. Beams /, 2 are connected between themselves by transverse beams so that A rectangular frame is obtained, serving as the frame of the screening device. The lower and upper ends of the stanik are open so that you can load the screened material on the sieve located inside the frame. The lower open end allows you to remove the sifted material, j,

Between the channel beams / and 2 lies a sieve made of wire cloth and reinforced with only two opposite edges. In the drawing, the upper and lower edges of the sieve W are fixed; in most cases, it is the easiest to fasten precisely these edges; the other two, edges 77 and 72, remain completely free and lie at a small distance from the edges of the channel beams 7, 2 and from the projections, so that the sieve can fluctuate freely. Fixed edges of the JO sieve are bent in the form of a hook and clamped in transverse metal holders 13. The latter are hooked to the upper shelves 14 of the channel or angled iron bar 15. The method of fastening both ends of the sieve is the same, the lower end of which is put on the bar 75, and the upper on the same beam 76.

The bars 75 and 16 are attached with their ends to the rods located along the length of the beams 7 and 2 and having the form of bolts 77. Bolts 77 are placed on one side of each beam 7 and 2, and their free ends are provided with a screw thread 18 and have shoulders 19, to which adjoin bars 75 or 16, held in place by nuts 20, screwed onto thread 18. Opposite (inner) ends of bolts 77 are threaded and extend through outwardly extending flanges 27 of support angles 22 fixed to the sides of channel beams 7 and 2. Bolts 77 secured in these supports mind clamping nuts 23, 24, directed towards each other. When the said nuts are clamped, the bolts 77 cannot move in the longitudinal direction. At the same time, they are so long and resilient that they participate in the swing, when the sieve 10 is brought into oscillatory motion.

To vibrate the sieve, an electromagnetic vibrator 25 is used, the bark of which 26 is attached to a metal strip 27, curved in the shape of a letter V. The lower ends of the stirrup 27 are attached to a thin and elastic metal strip 28, which, in turn, is attached directly to sieve 10, with it located across it but may be located longitudinally. The vibrator (Figs. 1 and 2) is fixed on the bridge 29, which covers the entire width of the bed and is attached at its outer ends to the channels 7, 2. The vibrator anchor 26 moves in a plane perpendicular to the sieve plane fO. Depending on the length of the sieve between its fixed ends, one, two, three, and even more electric vibrators or other devices that can drive the sieve into an oscillatory motion can be used.

To insert the sig in the frame, first loosen one pair of bolts 77, i.e. pushing one pair of bolts towards the middle of the beams, so that the distance between the flanges 75 and M bars 75 and 76 is reduced. Then it is easy to hook on the shelf / 3, 14 hook-like curved edges of the grid. The bolts / 7 are then moved along the beam until the sieve is as tight as necessary to communicate the desired vibrations. When the sieve is tensioned, the other two edges of the sieve remain completely free and do not touch any parts of the frame.

When a sieve reinforced according to the invention is brought into oscillation by an electromagnetic vibrator, the entire surface of the sieve receives an oscillating movement in such a way that the amplitude at almost all points of the sieve is the same. The magnitude of the amplitude depends, of course, on various factors, for example, on the nature of the material being sieved, its weight, the nature of the sieve itself and the nature of the vibrations reported to it. For all this, the amplitude of oscillation remains the same over the entire surface of the sieve, and none of the factors listed above can make the magnitude of the amplitude in one place of the sieve more than in another. The reason is that the sieve is completely free to oscillate and can oscillate with great mobility, as schematically shown in fig. 5, where the upper and lower lines represent the upper and lower limits of the amplitude of the screen, shown as a wavy line. The action of the sieve is similar to the action of a completely free moving sheet, performing a wave-like movement that occurs at the place where vibrations are transmitted to the sheet and spreads towards the edges of the sheet without gradually decreasing the amplitude, since the edges of the sheet are completely free and not clamped.

The mobile state of the sieve and the uniform amplitude of its oscillations are obtained due to the free to oscillate position of both pairs of support rods (bolts), on the free ends of which the bars, stretching edges of the sieve are reinforced. Although the internal ends of the bolts 17 are rigidly fastened to the supports 22, the bolts of these thanks to their elasticity can make small oscillations perpendicular to the surface of the sieve, caused by the influence of those oscillations that are communicated by the electromagnetic devices.

The supporting sieves fixed at the free ends of the bolts 77, bars 75 and 16 can also oscillate up and down, as a result of which parts of the sieve located near the bars 75, 16 can have the same amplitude as the central parts of it.

The advantages of the sieve according to the invention, which consist in the uniform amplitude of oscillations over the entire surface of it, have the effect of increasing the productivity of the sifting machine without increasing the machine itself. In addition, due to the movable suspension of the sieve, it is not as easily clogged as the sieves known hitherto, so that the sieve can be positioned with a smaller inclination.

The subject matter of the invention can be made in a variety of designs. For example, in FIG. 10 - P shows a modified structure in which the support rods are composed of leaf springs 40. The springs 40 are attached to the brackets 41 located on the sides of the channel beams of the frame. Like the bolts 77 described above, the springs 40 resiliently support the transverse bars 2, to which the ends of the grid 43 are attached. The springs 40 are located approximately parallel to the frame length and to each other and are directed in opposite directions to the outer ends of the frame. One of the pairs of springs 40 is fixed so that it can be rearranged in the longitudinal direction; Due to this, one of the transverse bars supporting the sieve can be moved to properly tension the mesh. For this purpose, the ends of one pair of springs 40 are attached to the pads 44 inserted into the stationary, its supports 45. The pads 44 can slide with respect to the supports 5 if the bolts 45 inserted into the supports pass through the pads. Once the pads are properly installed, they are secured with nuts 47.

Another embodiment of the invention is shown in FIG. B-7, The constructions described above are mainly intended for relatively heavy sieves with more or less large openings made of very thick wire. The scope of such constructions is limited to some extent by the fact that in order to put on and adjust the sieve, it is necessary to restore the supporting rods or bolts at the two opposite ends of the frame. In cases where the sieves are less rigid and have smaller loops, it is recommended to use a modified design that allows adjustment or insertion of the mesh from one side only, namely from the bottom or top, if desired. But it is better to arrange so that the grid can be rearranged on the upper side, and not on the side to which the sifted material is being removed.

FIG. 12 and 1 | a perspective view of an inclined screen is shown, the frame of which consists of inclined beams 50 located at some distance from each other and parallel to each other, which are suitably connected to each other by transverse beams 51. In this frame is placed a sieve attached with its upper and lower edges to the tensioner, while both side sieves remain completely free. In the depicted example, the use of a sieve having a relatively large length and a relatively small width is assumed. The lower end of the mesh is attached to a channel beam 55 supported by support rods 54, having the same construction as the rods 77. The upper end of the mesh is attached to the transverse beam 55 (Fig. 9 and 12) lying on an iron corner 56 attached to the transverse

frame 57. Several bolts 58, passing through the transverse beam 55 and screwed into the fixed transverse beam 57, are used to translate the transverse beam 55 relative to the frame. The movement of the beam 55 is carried out by rotating the screws 58, which for this purpose are provided with polygonal tips 59 at their protruding ends, on which an appropriate key can be applied to turn the screws. When the net is inserted, its lower end first engages, and then the upper end, over the transverse bars 53, 55. After that, turn the screws 58 (Fig. 13) until the sieve is properly tensioned.

In the devices according to FIG. 12 for loading the sieve of the screened material onto the upper end, a guide sheet 60 is applied, fixed in the frame and sloping at an angle to the surface of the screen. A material is laid on this sheet, which slides over the sheet onto the net. This prevents the material from directly falling onto the net; the material slowly slides down the sheet, rather than falling onto the net suddenly. The upper part 61 of the net is not subjected to any load, as a result of which it can be easier to oscillate, than if the material were applied directly to this part. As a result of the release of the upper fixed end of the sieve from the load, an almost completely uniform oscillation of its entire surface is obtained with an amplitude that is the same in all its points. FIG. 8 is a schematic representation of how the screen sways. Line 63 shows the position of the lower end of the guide sheet 60, and the upper and LOWER dashed lines indicate the upper and lower limits of the span, the sieve. If the screen has a considerable length and width, as schematically shown in FIG. 12, it is desirable to use several electromagnetic vibrators. The drawing shows by way of example three vibrators 64, approximately equal distances from each other, and dividing the grid into equal parts from top to bottom. In this case, the upper boundary of the sieve should be considered as the place where the material falls on it, since part of the grid, covered by sheet 60, does not carry material and does not participate in sifting.

In the device just described, the tension of the grid and its insertion can be carried out from the rear side of the apparatus and there is no need to arrange a free passage on both sides. Such a structure has an advantage in those cases when it is difficult to approach from two opposite sides. In the same design, due to the larger number of adjustment screws located relatively close to each other, the grid can be more evenly stretched. This circumstance is of particular importance if grids of a certain weight are applied.

The image depicted in FIG. L2 device is equipped with a grid having a greater length compared with the width. However, this design is not intended solely for meshes of the specified shape. FIG. B - 7 shows a top and side view of the device in which the lower end of the sieve is attached to supports that can oscillate and the upper one is fixed on a non-oscillating movable bar. This method of reinforcement is also suitable for sieves, the length of which differs little from the width.

The subject of the patent.

Claims (3)

1. A device for fixing the sieve on a vibrating screen, characterized in that the sieve JO is clamped with two opposite ends in cages / 5, grasped by transverse bars / 5 and 16, which are fixed on free, capable of oscillating ends of the rods 17 attached with their other ends to the place the frame lying between the fixed ends of the sieve /, which bars can be relocated independently of each other in the direction of the length of the sieve 10 in order to tension it at the screen (Figures 1-4). 2. The form of execution, the device according to claim 1, characterized in that the rods / 7 are composed of bolts having elasticity along the entire length, or of leaf springs 40 (Figs. 10, 11). 3. The form of the device according to claim 1, characterized in that only one end of the sieve / is fastened (fig. B - 9). to the patent of the in-ing company Kompani V.S. Tyler 30143 2 / 3 to patent in Fig.Z company "Company V.S. Tyler S0143 Fig.5 to patent in j-jf .JS3-f; 5 i / f IV-. ij- ittfe - r 1.,, - f-i c-ii g. U omkJ ; Jjf5 3 frj / --§: T - e Fig ё / x1l s ..HivUFIGH of the company “Company V.S. Tyler No. 30143 to the patent of a company. Company V.S. Tyler, № aoiz PhyoG. V ( -but FIG. it Fig.12 F and r.i3 ao -J-iC jfS