LT3837B - Flat bolter - Google Patents

Abstract

Invention applies to solid material sorting, namely to the big or square riddles, that consist of many sieve stacks made, for example, of more than 20 sieve boxes. The proposition is to make frames of sieves without holding the framework and after stretching, they put on or into the frames of the sieve. As a result between the sieve's fabric and flat background the brick forms an empty space for the product to pass and to remove the same. Cleaners of the sieve are put-on or put-in on a flat background brick. The best sieve frames are made of metal. The sieve cleaners clean the fabric of the sieve and remove the product from the background brick. In addition there are proposed sieve cleaners with two, three or four branches.

Description

The invention relates to a flat screen grate device, which consists of a flat screen grate having a screening box with a base brick, a ground product unloading device, a mounting frame, as well as free-moving cleaning elements.

The flat screen, namely the large flat screen or the square flat screen, is a large cube with large flat elements and has a special separating device, which is characterized by coarse, medium and fine milling in the flour industry and used in various cereals such as wheat, rye, corn, barley, etc. for sorting.

It is known that many types of separation technology, such as .chemical industry, need to reduce the moisture content of products to prevent the separation equipment from clogging with this product. Conversely, grinding products require the optimum moisture content of the milling products, but as flour mills require repeated grinding and sieving, moisture is defined by permeation and not by the maximum possible sieving effect.

It is known that many milling fractions have poor flowability or sifting due to high humidity. This can be seen working in a home kitchen with a flour sieve.

Flat screen sieves use sieves with all possible hole sizes, from the smallest. For example, 80 microns to the largest. In all cases, efforts are made to achieve maximum sifting efficiency without clogging the sieve holes. Maximum throughput must be achieved as well as the highest possible quality of grinding of the product. In contrast to the classic sifting method, sifting the flour through a sieve assembly produces a closed layer of the product up to several cm in size. This results in the additional downward pressure (weight force) of the small, fine particles on the sieve assembly resulting in higher throughput and higher throughput. On the contrary, larger particles of product remain on top, with the layer sliding off the sieve. The method of sieving this thick layer causes great difficulty in grinding wet products, which causes clogging of the sieve holes.

Over the last 100 years, increasingly efficient flat screen sieves have been developed and sieve cleaning has steadily improved. Many forms and variants of materials have been tested, some of which have been used in practice. In the area of the inset plate sieves, some shapes, including the most widely used 5-10 centimeter stretches of textile belts with a metal saga in the middle, have survived. Sieve material squeegees are placed between the sieve material sets and the grating screen and secured. In this way, the underside of the sieve frame has a metal mesh which is the liner for the wipers. In most cases, the metal mesh has slight waves, which is why

The -3metal saga receives strong shocks to the metal mesh. Thanks to the fluctuating and rotating motion of the entire flat screen, the belt section gets intense free movement, which generates a lot of noise and keeps the sieve holes from clogging. The metal mesh as well as the metal saga play an important role in the movement of the screen material in the squeegee. The disadvantage of this method is the clearly audible noise generated during movement. Different shapes of plastic that work in the same way are also known for use in sieve cleaning.

Another challenge facing flat screen sieves is the complete release of its base plate. The finely ground product falling through the sieve must be removed from the baseplate in a minimum of time and must pass through the side slits. There is also a separate category of cleaning elements, also known as base cleaners. Triangles and quadrangles, rhombuses or polygons gained the greatest use.

Many factors affect the quality of a flat screen work. The newly wrapped sieve frame works better because not only wear but also sieve tension is important. However, experience has shown that a flat screen has performance limitations even in the best condition. There is also a limit to the intensity of the oscillatory movements, i.e. maximum acceleration, on the one hand, with the maximum permissible forces in the flat screen casing, and, on the other, the character of the movement of the product. Excessive acceleration forces prevent the product from moving freely. The specific quality of the individual sieving fractions determines the performance of the device.

-4VFR patent no. The description of 2506981 proposes to give the surface of the base plate a saw blade so that the product is driven off automatically in the shortest possible time with the appropriate impact forces. In some specific cases, this achieves some advantages, but the realization of such solution in production has not happened. Ultra-fine heavy fractions can be expected to clog the base brick or sieve grid. Cleaning a flat screen in a mill is time consuming. Recently, the aim is to create machining machines that can either be self-cleaning or can be easily cleaned at low cost.

The present invention seeks to improve productivity while improving equipment and solving a set of cleaning issues within a sieve box.

The solution according to the invention is characterized in that the sieve frame has only one-sided cover and preferably at least one-way plate compartments, forming an appropriate amount of sieve and brick base cleaning fields, and the cleaning element (or cleaning elements) in the base brick (insert) in the cleaning field (s).

As is well known, most sieve sets in the mill change and the dairy sieves are replaced. As a result, an appropriate number of reserve sieve boxes are held behind the flat screen so that they can be quickly replaced.

So far, experts have believed that independent, targeted optimization of the mesh fabric and sieve base should yield maximum results, but

-5this invention proves the opposite. By combining the volume of the screen cloth wipers available so far with the volume of the base wiper, the resulting cleaning field can be selected as the free space for passage of the product and the removal of the product to a greater than each but smaller than both. In this way, the efficiency of both functions is increased, which, together with the proper combination of the cleaning elements, is also one of the main factors due to the extremely positive effect of sifting, as well as the increase in sifting efficiency with identical sifting quality. Thanks to this, there are some unexpected issues that can be solved, including:

- rapid replacement of sieve frames;

-Quick replacement of screen cleaners

- Easy cleaning of the whole flat screen sieve

- increasing the efficiency of a flat screen,

-reduction of structure height and so on.

The invention makes it possible to realize a whole range of especially preferred constructions. The sieve box and sieve frame have the best overlapping strip sections in the case of breakdown, and are also designed for two-sided unloading of finely ground product. The sieve frame may have additional transverse sections to form several cleaning fields and an appropriate number of elements. For example,

2-9, preferably 6-12, roughly square, for cleaning fields. It is further proposed to use a sieve frame with a minimum height dimension so that

It is a special advantage that the inserted sieve frame is made of metal, especially aluminum or other light metal. The new frame to be inserted must be sufficiently rigid and shall not cause any deformation of the frame even without screwing it into the sieve box. This gives you several advantages at once. The sieve frame can now be easily cleaned as it is easily removed from the sieve box and especially because the sieve fabric can now be cleaned at low cost such as brushes or compressed air. If the embedded frame is made of metal, this part can be treated with water, hot steam, etc., which has hitherto been hampered by its wooden construction.Also, the embedded frame can be made of metal and wood, but this is irrational due to the high cost. It is useful to fit the sieve frames and the boxes together so that the frame is in or on the box or can be placed in the box, and in all cases, a quick connection can have the corresponding advantages.

The mesh frame is made of lightweight metal profiles by welding. The solid box shape and mass wooden box mesh frame is made in a known manner and has 1 to 3 side channels, and the contact surfaces of the product are best covered with plastic.

The base brick of the sieve frame can be made of metal, i. of metal sheet. In special cases, the base brick may be made of plastic.

-7Next, the preferred one, being the nucleus of the invention, is a cleaning element which, when placed on the main brick, can be placed in three-dimensional fields. The cleaning element has an oscillating support, preferably made of a non-metallic material, and the support is located in the vertical axis of the cleaning element so as to result in a long change in the mesh fabric and substrate cleaning operations as a result of appropriate oscillatory movements. Many effective forms have been found for this.

In the first embodiment, the cleaning member is in the form of a boomerang with two protruding branches which have an upwardly directed means for cleaning the mesh fabric, more preferably, the cleaning member having a front portion facing the protruding branches for cleaning the base and elongated groove.

In the second embodiment, the cleaning member is comprised of three branches, in addition, at least two of the branches are provided with a top screen fabric cleaning means and one branch has an outwardly elongated front for cleaning the base and elongated groove.

In the third embodiment, the cleaning member is comprised of four branches and at least one branch has an elongated front portion for cleaning the base and an elongated groove.

In all cases, it is essential that the cleaning element is made of an elastic spring material, most likely plastic-free metal.

-8This results from the fact that each stroke of the ram on the sides or strips of the sieve box, respectively, due to the action of the spring, moves the sieve cleaner in some other way. Relevant continuous motions, including oscillatory motions, statistically indicate that any part, be it a part of a base brick or a sieve, is cleaned at a high relative frequency, which removes even the smallest amount of finely ground product. The size of the sieve squeegee shall be chosen so that it has a fixed mass and, at its maximum horizontal size, represents more than 50% of the corresponding minimum size of the individual fields. Optimal cleaning is achieved in all proven shapes, with the fields created in the horizontal projection having a square shape, since then the wipers optimally clean the surface in all directions and easily unload the product.

So far, the optimum function is obtained when the branches have a roof-shaped cross-section with a top at the top and a wide section at the bottom. Not only does this keep the product moving with the base brick, it also helps prevent the product from sticking to the cleaning element and staying clean. The top of the branch has a variety of cleaning products such as brushes and bumps and / or cleaning scrapers. The substrate is optimally cleaned when only one branch has a liquid branch.

The sieve squeegee shall be slightly below the height distance between the base and the sieve assembly, despite the fact that the base and the sieve fabric are treated in the same way, the sieve fabric in the middle shall have a fluctuating support such that the outer ends of the branches

-9 for machining both surfaces with constant alternation of up and down movements

Further, particularly advantageous fulfillment is when the branches have an impact-reflecting plastic head at their outer ends. This head is, on the one hand, a fabric cleaner and protrudes in the shape of protrusions or brushes and, on the other hand, minimizes the height of the mesh frame structure and, moreover, supports the bouncing motion of the cleaning element to prevent damage to the element. .

Accordingly, in a further preferred embodiment of the invention, the device has a plurality of flat screen sieve headers, each of which comprises a plurality of base box mesh boxes, these frames, as well as screen channels, which are rectangular or square. Frames covered with a sieve cloth can be replaced with respect to the sieve box and the sieve boxes above the base brick together with the sieve frames provide space for passage and removal of the product, which can accommodate sieve squeegees over a flat base brick; frame noise to reduce the sound pressure of the noise source.

While it has not been possible to significantly reduce the noise of a large flat screen, the invented flat screen noise level appears to be slightly higher than 72 dB (A) compared to the 84 dB (A) state-of-the-art flat screen. of non-metallic material as well as non-metallic sieve frames

-10frame binder for material cleaners, now any conditional movement between metal parts has been eliminated.

The invention will now be described in detail with reference to the accompanying drawings, in which:

FIG. 1 - sieve frame with horizontal slide on sieve box;

Fig. 2 is a plan view of a sieve box with an inserted sieve frame partially without sieve fabric;

Figure 3 is a sectional view taken along the line of Figure 2;

Fig. 4 is a section b-b of Fig. 4; 2;

Fig. 5 is a plan view of a mounted sieve frame;

Fig.6 - section c-c according to Fig. 5, assembling a plurality of mounted frames together into a headquarters;

Fig.7 - The sieve box headstock moving with the upper mounting frame;

Fig.8 - Large flat screen with built-in sieve head;

FIG. 9 is a plan view of a boomerang-shaped sieve cleaner;

FIG. 9a is an arrow view of Fig. 9;

FIG. 9b is a side view b arrow 9;

FIG. 9c - sieve cleaner in slot cleaning position;

FIG. 10 is a plan view of a three-sieve sieve

FIG. 10a is a three branch sieve cleaner in the slot cleaning position;

FIG. 10b is a sectional view J-J of FIG. 10th

FIG. 10c is a sectional view H-H of FIG. 10;

FIG. 11 - four branch sieve cleaner in angular position;

-11Fig. 11a is a screen cleaner in the slit and screen cleaning position;

FIG. 11 b - Sieve cleaner in sieve cleaning position.

The sieve will now be described in accordance with Figs. 1-4.

The grate box 1 has a plurality of drainage channels, two of which are for lowering the sieve products for the respective coarse mill products 2A and 2A ', as well as the drainage channel 2F for the grating product, respectively, for the fine mill product.

Sieve frame 3 Fig. 1 is slightly inclined and is in horizontal position of sieve frame 3 on a sieve box. The inside surface of the sieve box 1 is covered with a flat base brick 4 in the lower part of the sieve frame so that the finely ground product or the product under the grill can only be removed through the slots 5 of the base brick 4 (Fig. 3).

The screen brackets 6, 6 'respectively 6', are placed on the base brick 4 before the screen frame 3 is mounted. The screen 6, 6 'respectively, performs a dual function, the spacer support 7 The spacer support 7 must be scraped under the grid. According to FIG. 1-4, the finely ground product is removed only through the conduit 2F so that the finely ground product moves along the entire length of the substrate in the respective longitudinal direction shown by arrow 8 to the slotted holes 5. Box 1, immediately above the substrate, has strips 9, which divide the surface of the base brick 4 into three longitudinal fields. These strips 9, in particular, increase the stability of the base brick 4. Sieve frame 3

I

-12 also have strips 9 'which are precisely positioned above the base brick strips 9. In addition, the sieve frames have transverse strips 10.

FIG. In the example shown in Figures 1-4, not only are the spatial fields B, D, and F formed by the strips 9 of the base brick, but also the additional spatial fields A, C and E thanks to the additional sieve frame 3 dividing strips 10. ... F) The number is determined by the appropriate division of the inserted sieve frame. The main factor is that in each field formed in this way, a cleaning element 6 is inserted, which leaves a loose sieve fabric at the top and a substrate at the bottom.

FIG. 3 and 4 show Figs. č cuts, placing two boxes 1 on top of each other. Each box 1 is provided with a frame 3 such that there is a space 12 between the sieve fabric 11 and the base brick 4 for passage and removal of the product, in which the sieve cleaners 6, 6 'and so on can move freely. The intermediate support 7 of the squeegees 6 and 6 'here performs the additional function of shifting the finely ground product from field B to field A, from field D to field C, from field F to field E, which is possible without additional operations the strips 10 are arranged only in the sieve frames 3 and not in the base brick, so that at the respective location above the base brick a crack 13 is formed. The protruding upwardly brushed mesh 11 is always cleaned over the entire sieve area. The sieve cleaner has an oscillating support 14 in its central part so that the sieve cleaner performs its function alternately by means of easy oscillatory movements up, down and, despite the friction and inertia forces, can move freely on a flat base brick 4.

I

-13The multi-branch design of the cleaning elements 6 and 6 'has the great advantage that any flat part of the mesh fabric, just like the brick base part, is always kept in a clean state, including the outer corners. The cleaning elements ensure optimum operation in all spatial directions. . The relatively high weight of the sieve squeegee as well as the smooth surface of the base brick results in intensive movement of the squeegees 6 and 6 '. For longer operating periods of the squeegees, the squeegee can keep the mesh fabric and base brick clean.

FIG. Figure 5 shows an almost ideal square section with 9 fields, showing the sieve cloth 11 on only one side of the sieve frame. The length of the cleaning field is L and the width is P. The tension on the sieve requires considerable forces.

Another difference of the present invention is that the sieve frames are made of thin and light metal strips, in part this applies to the frame profiles 15, 16, 17. As can be seen from Figs. 6, the sieve frames 3 are covered on one side only, namely, by a tensioned sieve cloth. The opposite side of the sieve frame is open, so that the sieve fabric 11 is equally accessible and can be easily cleaned from both sides only by inserting or replacing the sieve frames. The entire frame of light metal can be made as a monolithic structure obtained by die-casting metal or more rationally than a welded structure. It is very important that the frame allows only minimal bending in the elastic part under the action of the tension forces that hold the tensioned mesh fabric in operation. The curvature is shown symbolically in Figs. Line 5 18. To replace the sieve it is necessary to prepare a large number of reserve sieve frames 3 with different tension. Thanks to this sieve, the frames are strong enough. have thin profiles and their thorium compared to known ones

These frames take up little space when stored in a spare parts warehouse, as shown in Figs. 6. It is also expedient to produce strips 9 and 9 'from the respective hollow or solid metal profile. The exclusive metal frame has special advantages. Such a frame has a high bending stiffness if the corresponding value of the elastic coefficient is selected.However, the sieve frame can also be made of metal, wood or by joining metal with plastic.

FIG. Fig. 7 shows a staff 19 of eight stacked sieve boxes 1 with three sieve screens.

FIG. Figure 8 shows a complete flat screen with the doors removed at 20 sieve locations and showing all sieve strainer 19. The strainer strainer 19 has 24 boxes in a known sieve 1. The sieve box found can increase the number of sieve boxes and sieve frames by at least 10% in volume and at the same height of the screen, all the flat screen 21 has a pivoting actuator not shown in the drawing, which gives all rotary motion; for this purpose, the screen 21 is suspended on the rods 22 as a self-balancing pendulum. The product is fed through the inlet nozzles 23 and 23 'and so on. into the sieve racks, and the sorted product is removed by the discharge nozzles 24 and 24 '.

FIG. 9, 9a, 9c depicted as a cleaning element a boomerang 25 which has two mutually spaced arms 26, 26 'respectively.

-15 The abutment at the top has protrusions 27 which serve to clean the mesh fabric. A boomerang 25 having a pivoting support 14 in the vertical axis S, which is a dimension X equal to several millimeters, protruding from the two supports 28 and 28 '. In addition, the boomerang 25 has an elongated front portion 29 opposite the two arms 26 and 26'. the respective portion could displace the fine mill product through the slot 5 as shown in FIG. 9c. In order to obtain lateral portions 30, such as sieve frame 3 pushes, during the crack cleaning, the boomerang 25 has an impact field 31 in the direction 29 of the front portion. For proper operation of the cleaning element, only the oscillation support 14 and the supports 28 and 28 ' , as well as the edge 32 of the front 29 being at the same height. This results in a free interaction between operational elements, resulting in a uniform number of operational applications with high precision in statistical methods. FIG. 9c also depicts bumps 27 for cleaning the mesh fabric and cleaning the front slit 5.

FIG. 10 shows a star 33 having, which has three branches 34, 34 'and 34 disposed at an angle of 120 ° to each other. Cleaning means, such as the protector 27 of the protrusion 27, each branch has an impact head 35 which itself has an impact part for cleaning the sieve. As can be seen from the two sections H-H and J-J shown in the drawings, the cross sections 34, 34 'and 34 of the branches are roof-shaped. The two branches 41 and 41 'are made identical, and the branch 41 additionally has a front part 29.

FIG. 11-11b shows a star 36 with four branches. Branches 37 and 37 'made identical, branch 37 very similar to other branches,

-16 but has a cleaning edge 38 in place of the cleaning bumps. The branch .37 has an additional front 29 for the star 33.

FIG. 11a illustrates bumps 27 for cleaning the mesh fabric; 11b the brushes which are placed on the branch 37 and clean the sieve fabric 11. FIG. 11 shows a star-shaped squeegee 36 in the cleaning position of one of the 4 corners of the base of a sieve box. Due to the relative motion BS between the star-shaped squeegee 36 and the flat screen or base 4, the grain pile 39 of the arrow slides in the direction of the arrow BG directly into the oblong hole 5. Cleaning elements with even greater number of branches can be constructed. in terms of speed.

Claims (15)

DEFINITION OF INVENTION. 1. A flat sieve consisting of a sieve having a screening box with a base brick, a fine mill and a coarse material unloader, a mounted sieve frame and a free-moving cleaning element, characterized in that the sieve frame is covered on one side only and has , preferably, at least one-way strip compartments for forming an appropriate number of cleaning fields, in addition, the cleaning element (s) located on the base brick may be placed in the cleaning field (s). 2. A flat screen according to claim 1, characterized in that the sieve box and the sieve frame have overlapping strip sections, preferably for two-way unloading of a finely ground product. 3. A flat screen according to claim 1 or 2, characterized in that the sieve frame additionally has transverse compartments for forming a plurality of cleaning fields and an appropriate number of cleaning elements, more preferably a plurality of cleaning fields are formed approximately in a square shape. A flat screen according to one of claims 1 to 3, characterized in that the sieve frame has a minimum possible height and is made as a freely replaceable insertion frame. 185. The flat screen according to one of claims 1 to 4, characterized in that the sieve frame is a metal frame, preferably a one-piece metal frame. A flat screen according to any one of claims 1 to 5, characterized in that the sieve box is made of wood and forms an outer frame having 1 to 3 channels, in addition, the product-contacting surfaces are covered with plastic and the base of the sieve box is made of metal or plastic. 7. A flat screen according to one of claims 1 to 6, characterized in that the sieve frame with the sieve fabric is a lid of the sieve box from above. 8. A flat screen according to one of claims 1 to 7, characterized in that the cleaning element is combined at the top as a screen cloth cleaner and at the bottom as a base cleaner and preferably having a pendulum support in its vertical axis. 9. A flat screen according to claim 8, characterized in that the cleaning element is in the form of branches and has mesh fabric cleaning means which are applied on the outer ends of the branches and in addition have elastic properties due to their shape and construction material. 10. A flat screen according to claim 8 or 9, characterized in that the cleaning element is a boomerang shape with two protruding branches, which have upwardly protruding mesh fabric cleaning means, more preferably, in front of the protruding branches, the cleaning element has a front part and for slit cleaning. -1911. A flat screen according to claim 8 or 9, characterized in that it is a three-pointed star-shaped, in addition, at least two of the branches have fabric cleaning means and one of the branches has an elongated front for cleaning the gap. A flat screen according to claim 8 or 9, characterized in that it is made with four branches and at least one branch has a front part for cleaning the base and the slot. 13. A flat screen according to one of claims 8 to 12, characterized in that the screen cleaner has two or more branches and the base cleaning agent, at its maximum horizontal size, represents more than 50% of the mini- mum size of the respective field taken. A flat screen according to one of claims 8 to 13, characterized in that the branches have a square cross-sectional roof. A flat screen according to one of claims 8 to 14, characterized in that the branches have one at the top with different cleaning agents, such as brushes or bumps and / or cleaning edges. A flat sieve according to one of claims 1 to 15, comprising a plurality of sieve strainers in a sieve body, each consisting of a plurality of base box sieve boxes, as well as sieve frames and sieve channels, having a rectangular or square shape, that the sieve frames with tensioned sieve fabric can be replaced with respect to the sieve box, and The 20-box base brick, together with the sieve frame, provides free space for passage and removal of the product, which can include sieve squeegees on a flat-base brick, and the grate frames are grille-free to reduce the sound power of the noise source.