DE2240051A1 - Stretched elastic sieve supported on frame - gives predetermined sag during vibration increasing vibration amplitude - Google Patents

Abstract

A sieve is made of elastic material, as described in 2126276, stretched over a supporting frame which exceeds, in each field of the sieve, the dimensions of the corresponding portion of the sieve itself by an amount equal to the intended stretch. The sieve therefore does not fit onto the frame until it is stretched and assembled on it. In the present patent, which is an addition, the difference in length between the elastic sieve and its supporting frame which determines the stretch is so selected, in conjunction with the residual tensile cross-section in the perforated zone, and the elasticity or shore hardness of the material used for the sieve, that wmeh the predetermined depth of material is placed upon the sieve and the sieve is accelerated or vibrated, a desired concave shape of sieve is achieved in each sieving zone. The amplitude is considerably increased when the sieve is vibrated. In an example using 50 mm depth of hard stone on a 250 mm length with supports at 170 mm intervals a maximum sag of 8 mm during vibration was achieved.

Description

r _t | f Albert Wehner, Obering. 7881 Willaringen 2,

ί-., Vi? 't> y Wieladingen

;: - 4 '| ^ € α | House 35

Subject: August 10, 1972

"Stretched elastic sieve bottom"

Under file number P 21 26 276.0 a zoned strained sieve tray has become known, which consists of 2 main parts, a so-called "tension grille" and the actual elastic sieve bottom.

When assembling the overall arrangement, for. .in a sieve machine, The tension grille and sieve bottom form a unit.

Instead of the so-called "tension grille", a so-called "Clamping or frame grid" according to the German patent application P 19 57 065.1 use over the then the actual elastic sieve bottom is stretched.

The principle of this sieve bottom is always maintained when a support structure tailored to the desired expansion of the individual zones of the actual elastic sieve bottom, in this case the tension grille or the tension or frame grille with the actual elastic sieve bottom is built into the sieving machine and working elements then form the effective installation unit.

It has now been found that such sieve bottom by new Inventively coordinated shapes both in the case of the tension grille, the tension or frame grille, as well as can still be improved significantly and advantageously for the individual sieve bottom parts | here these are inventive To carry out measures in terms of production technology as well as assembly technology and screening technology.

409809/0156

I 2240ObI

"Stretched elastic sieve bottom"

This results in economic advantages that these sieve tray inventions make use of! make highly recommended on all raw ^'one material sectors.

The manufacturing-related "-" advantages result e.g. from that the frame grids can be attached with oinero and detachable special plug-in part can be provided * which makes it possible to also use rigid and very stable materials for insert the frame, which in connection with the plug-in part makes it extremely easy to assemble when attaching of the actual elastic sieve bottom on - m frame grid results. This assembly, which used to be very difficult can now also be saturated by unskilled workers.

By attaching special connection profiles, e.g. for gluing or clipping the elastic sieve bottom on the frame - as the invention suggests - these special, preferably elastic connecting profiles underneath the support and fastening strips on the actual one, free of sieve openings Sieve bottom attached! / SBrden ^ the assembly times both ^ ei the original equipment as well as the later exchange the actual sieve bottom on the tension or frame grille, which can be used several times, is essential lowered.

By introducing individual molded and on a single zone section aligned elastic sieve bottom parts with complementary profile approaches gemäsa of the invention are provided, is a more economical production and also utilization of the actual Given sieve bottom.

From a seventh technical point of view, there is another Proposal of this invention - as has already been confirmed by experiments - considerable advantages with regard to climbing

AQS809 / 0156

"Stretched elastic sieve bottom»

rang of the specific sieve performance and the self-cleaning process? like this elastic sieve bottom. This increase in performance compared to known elastic sieve bottom is achieved according to the invention in that between 2 transverse struts, which are an elastic zone ^^ Se ^ Bf according to the intended load in an application, an adjustment to the present sieve load occurs in such a way that in connection with the loading of the zone by the material to be screened and the effective coraponer ^ th of the screening machine in question result in precalculated movements of the screen base within the zone. These movements take place at the rate of the sieving machine frequency, whereby the concave sag is determined on the one hand by the mass of the material to be sieved and on the other hand by the acceleration through the sieve machine in its ends. This concave, oscillating stretching of the pre-tensioned sieve bottom zones, which increases the prescribed elongation length when the sieve bottom is at rest, practically becomes the oscillating movement of the individual sieve perforations within the tensioned sieve zone. This movement essentially counteracts clogging and the movements of the sieve gcnrgchichx) due to the effect aST \ biasing energy j ^ t the sieved material is loosened up considerably and the specific sieving performance is increased.

In addition to the load caused by the material to be screened, the selected ones have an influence on the magnitude of the advantages achieved elastic corrugated fabric is one dimension, with a Influence by — the chosen screen size: given is .. The dimensioning of the perforated fields can be done so, that the expansion of the webs xb Spannrihtuiig taken into account becomes - in the rest position, they are thicker than the head gates.

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"Tensioned el -.- jt ^ eehe r sieve bottom"

JJinflusf; also has the chosen premonition in the rest position of the elastic Uj-ebbcdens. Uti to make this clear, here is a "load example from test practice:

In an oiebguttelcsturg by H & rtnubotter, it results in a layer high ^ vrm 50 ram on - ^l / O "^ length and a u-3fltsab ;; t, and the cross struts ir, the zone u- \ 170 mi:.; At an acceleration g by the öiebpiaschine of Figure 6; at a GiebTaattenstürke of 4 -am bt = irke) at a selected perforation, within the ^L: Total of 50 mm ?? still a supporting cross section of 4 cn 'has', tin naxi-G- jiler sag v / ährer.d of the operation of 8 ima. The bias of you >> bodenq.uer3chniti: eG be rug thereby Cs. 10 ·; ί ir.d die HHrt '; det! Liebb' -. dcr.q. switch. 70 "'shore.

In practical terms, this means for the sieve bottom that the amplitude of the sieve neater was at its maximum sag of the sieve bottom and the sieve bottom even in it carries out relative movements, which favorable in terms of opinion and freedom from clogging impact.

409809/0156

"Stretched elastic sieve bottom"

Fig. 1} shows a frame grid according to the invention, which is provided with a plug-in part, which makes it possible to achieve a precisely predetermined expansion of the screen mat (1) with simple installation by folding it over. The clamping grid frame with its parts (2) and (2 ¹ ) is able to bring the screen mat (1) with the attachment profiles (4) onto the cross struts (5) by folding down the plug-in part (? ') after the plug-in segment (3) has clicked into place, the sieve bottom layer is properly tensioned and suitable for use

Fig. 2) to he ^ eÜÄ. The frame profiles (2) and (2 «) are all executed in profiles in the 7 shown. Angular profiles and U-profiles are ideal here and also pipe profiles. The front ends form the terminal strip or clamping bracket (6).

Pig. 3) shows the corresponding top view of Pig. 2)

Pig. 4-) shows the design of a frame grille in solid profiles made of plastic, whereby the frame parts (2 ") and (2 ^IM ) secure themselves at the plug-in point by a simple bevel when the stirrup (2" ^! ) Is over the guide tab (3 ¹ ) is folded down.

The attachment profiles (4), which belong to the actual screen mat and are vulcanized on here or can be glued on, lie on the cross struts (5 ') »whereby they go through here Clamping, gluing, bolting and the like to ensure an exchangeable connection.

- 6 409809/0156

"Spanned elastic sieve bottom

Pig. 5)

6) and

7) show in 'examples the possibilities, shapes and types of fastening with Aofsatprofilen (O provided sieve mat (1) on the cross struts (5)

In Fig. 5) the attachment profile (4) consists of fester U-shaped profile, the Bowohl on the sieve mat (1) as can be glued to the cross brace (5). The attachment profile (4) in Pig. 6) works after gluing or vulcanizing on the Siebuatte (1) as a clamping pro ^ il bsi more appropriate Shaping of the cross strut (5).

In Pig. 7) the attachment profile (4) consists of a-n simple rectangular cross-section, after which Gluing a countersunk hole to the head of the Can accommodate bolt (7). The cross strut (5) can in this case consist of a full profile, e.g. be 'designed' from plastic.

Fig. 8)
9)

»10) and

"11) show further examples of KIe mns ic he runge η with a correspondingly interacting design of the attachment profile (4) and cross strut (5). So The attachment profile (4) closes in Fig. 8) with its side grooves behind the wuxb * - like ends of the cross strut profile (5) »In Fig. 9), the attachment profile is formed with undercut mandrel attachments (8) provided, d ^ e during assembly in holes in the cross strut profile (5) should be taken.

- 7 - /, 09809/0156

fl.

"Tight, elastic sieve bottom

The similar principle is followed in Fig. 10 with external entrapment approaches.
Pig. 11) is comparable with the principle according to Pig- ü), but here the support is more elastic and more elastic due to the external profile.

the transverse strut profile from (5) and (5 ") cheaper to manufacture.

12)
15)
14)
15)

16) and

17) show the above-mentioned inventive I- ^T a3snahmen in A.bf orraung single zone portions that are both in production-technical and economic respects:

A special design of the long sides of the zone sections makes sense advantageous stage arrangement given, the 3 Has major advantages;

1) sinfi defective zones exchangeable,

2) is an intruder, of wedging grain at the point of impact through the Overlapping of the zone sections is not possible,

3) the puncture of the Aufsetzprufil with continuous sieve mats is taken over by the corresponding shape of the individual Z :; neri pU ich;: e itig.

409809/0156

"Tight elgr; ticcher sieve bottom

In Fi ^. l-ί) is the front brew of the sieve- ^ oner.ab.: c ^; ji! ttfto (l ¹ ) 7-shaped PxUagebJldet, w be 'the protruding ^ <; henkel (I " ¹ ) d je Gto:; ü-Jtf: ll'-' alt de", wir.}: oIiYr: .iyexi Hir .tercude i.IC'icr vt.r:; ctilier>i; t. TI «ber. A Klenrj- ■ ΐηά Klcbebeie.-ligunr de · vertical 3chenrcel vi (I" ¹ ) and (I ") kar.n for example., Where j ^ e ι. · · F. Ku". Ir * iZduvr. () -; «r J'che-'ir; · '> i ^' it. -: t '· il ^ enpr fil (* -.) werweu'ltt" - / erflen. I · P '. : ■) iai /.a^ ^ nte ^. 'Irhica by Fip. 1Γ) '".' - 7 ·" Ί · ~; rr, f; · Te äe ^ ⁷ on «. ri>'r chnittes τα? - <iw _fc uero. nitt.sver'i i:: - ;. k ?, (l " ^{! l} ) provided, π '.β n ^ hfjn de · * ^r urteL" one: i ^; h ^r , r »sn ElriCti-L '. t it abe? ·> · .ΐ * iuerhtre ¹ -, a .or; etr! ocVe .. r; - '. t.-otrebenprof il (S) <il ·. ·· It.

Fig. 1- ^ ur.d 15) ..tirf.i Vidtre tared by i ir, (_ o, eitigtn υ Λί. '·:! ":. ·! -R. ^ En of b_elr..'. I ¹ -. r s. "b- .. ... p '· ^: . ^; .fc, which after their. · ^ erenr.e ^ [, L ^ eri Yer- -ciebur-jj a ·: ^T T-shaped AoI's sentence on the .'... brir.trer.ev. (3) erTaöglicL- = n. Here, d'fi leg (1 ") scv / ie the tongue and groove-like training at 1 ( "*) a securing Pr II» =.

VLs. l ^c ) shows the GeofeiütansicVit trjnes S'iebzorienabstieges itn Schj.itt, as it is used for example in Fi £> 15) ./Orden. Fig. 17) shows a corresponding top view of the entire zone section.

Fig. 18) shows, '.as with a tension grid e.g. nae-h Fir. i) also one made of single sieve zone sections designed and connected by gluing Can be used with a matt finish.

- 9 409809/015 6

"Tensioned gate elastic love floor"

Pig. 19) indicates the use of a sleb ^ onen ;; uö: iminengesei; ^ th Sieve mat for ^ inen Zc. ^ Itter sieve bottom at.

Pig. 20) shows a measurement of the dimensions of a pull grate, which makes it possible to keep the height of a pull grate sieve bottom very low . hold, ie that the required high cross-section of the cross struts (:?) no longer have any influence on the installation height. By attaching an expediently under 45 ° angled end flap [5 ^% ) on the dtr ^ uerstrebe (5), the support height in the screening machine is practically reduced to the thickness of the connection ^{flap (5 1} ) + the thickness of the drawstring (10) and the Thickness of the actual sieve (1).

Pig. 21) gives an overview of the clamping of a Tension grid sieve bottom as a transverse tensioner in a sieving machine.

Pig. 22) shows at the top in a relaxed position and at the bottom in a tensioned position a tensioning principle suitable for Rahwengitter-oiebboden, in which a wave-like deformed resilient pressure band (13), which is connected to the cross struts (5) sweeps, is evenly pressed into place by pressing on a pressure rail (14) the frame (2 ^IM ) can be clamped to fit. The elastic sieve plate (1) can in this case in the desired elongation of the cross bars (5) be pre-attached when the tab carries at tightening of the pressure rail (14) (5 ^r) in the cutout (12) the respective clamping path.

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Pig.

23) shows the arbfcitsv / ui.-jfe of an elastic zone, <3i3 according to the present invention is. Diesre .; education is ge-r.'ma der envisaged load, to which it is coordinated, carried out.

The concave sag D ^ results in sicr. after Load from the material to be sieved already in the resting position. The concave sag D results from the run the sieving machine by the acceleration of the

Good to be screened.

By appropriate coordination ν> n bearing Zugq.uer cut, the chosen shore hardness, des elastic sieve mat sales material in connection the desired movements can be calculated and achieved with the loading of the material to be sieved, such as the example described at the beginning shows hard gravel sieving.

1409809/0156,

Claims (1)

"Scanned elastic sieve bottom"
-Expectations - Claim Yl) J: äitbboder; iiit one-n made of elastic material ^ ütufi "existing seventh day, the zo ^ en- wise! uit νυη Sieböffnun ^ en free or fastening - ^ strips pass i:; t, and which is mounted on Kahtu grids odex support grids, whose support bars are set up in a division around the lia'oS of the expansion in the individual zones are, aic the "onen dec ela ^ t see 'thieves, which is only in the context of its tension noiitae ^ declaration of the zones of the fragile lattice or spanning, characterized by the fact that the stretching of the, elastic Si the defining long-term difference between the elaütischea sieve base: and the supporting grid .'n connection with the remaining cross-section within the £ β1οοΐΓ., 3ϊΐ ijiebzonen, the Elaste old ^: it or It is agreed that by achieving a basti'iute, de -, sieVboden-burdening sieve material even with consideration of the sieving machine speed, we can achieve a desired long-term persistence within each individual sist ^ one d. - 12 - 409809/0156 "So-called elastic sieve bottom" Address 2): -Expectations- Stretched elastic sieve bottom according to claim I) - characterized in that in addition " ^v " of the stretching on the outer Crosspieces of the associated clamping .I- or lattice ~ special Verbindungsprofile.auf are adhered to the screen openings free of contact or attachment strip or vulcanized on or <ufgefor at ^r, which are then in turn clamped, glued or stuck on the transverse struts of the frame or clamping grating . Claim;>): Tensioned elastic sieve bottom according to speeches 1) and 2), characterized in that that closed zone parts made of elastic materials with perforated fields and with fastening strips free of sieve openings prepared and used in such a way that they complement each other's profile approaches Attachment grooves or angles for the cross struts of the frame or tension grids form. Claim 4): Tensioned elastic sieve bottom according to claims 2) and 3)> characterized in that the attachment or attachment profiles forming the grooves undercut the points bfjw. are accepted on which the tension straps of the tension grids or the 409809/0156 "Stretched elastic sieve bottom" - Α i ". S ρ r U c Pr jf _ lc de r Ry ":. ■ · ..j L ·.». · R , where · Ι.'έ Tragq ..; = - ·. '! "' T '·. Ui 'Quer;l;!E> r tlci Zug ^ itter through in · "., Nt angled Anc-chluijtlaschen (7i ^' · ^ -0 '<-iter the support height of the Zugb" -ier * .;'. Spatmgittern are led. Claim 5): Tense elaotic biebboden after the Claims 1), 2) and 3) »dad'txc ^ marked, that the tension de ^ elastic Sieve bottom on a ribbed grille is relieved that part of de .; RahTjiengitters have the shape of a plug-in bracket receives, with which it is possible to bring the clamping edges as close as possible to one another, that the elastic sieve bottom is still without stretching and that it is then turned over the stirrup as an effective Hontag ^ relief proves (7ig- 4 and Ic). Claim 6) Tensioned elastic sieve bottom according to claims 1), 2) and 4), characterized in that that a frame is set up to accommodate a tension grille. in the case of the spring band that connects it in convex waves rests and by a pressure strip that is mounted on the frame, a Tensioning of the elastic sieve bottom in the manner prescribed according to claim 1) by pressing the convex arches of the spring hinge takes place (Fig. 22). 40SB09 / 0156