EP1946852A1 - Screening machine - Google Patents

Abstract

The machine (1) has a housing (2), and screen decks (5-7) disposed on two sidewalls (3, 4). The screen decks include cross-members and longitudinal members that are respectively mounted on the sidewalls and the cross-members. The screen decks receive a screen lining (8) to be exchanged, where the longitudinal members are clamped to the cross-members from two different directions by removable mounting ties.

Description

The present invention relates to a screening machine, in particular a vibrating screen or vibrating screen machine, which is provided for classifying, screening and final washing of bulk materials and the like.

In the prior art, a vibrating sifter has become known which comprises a housing with two side walls, between which one or more screening decks are arranged. A screen deck is supported by the transverse struts or transverse members, on which longitudinal struts are welded, which hold the actual sieve bottom. In order to securely receive the longitudinal struts on the cross struts, support angles are usually welded to the cross struts, to which the longitudinal struts are then welded.

The cross braces are exposed to vibration loads in very high loads, so it can despite considerable wall thicknesses after some operation to breaks on the cross braces, resulting in a non-negligible downtime for the machine and a corresponding repair by itself. Therefore, the dimensions of the cross braces have been increased in the prior art to reduce downtime.

A disadvantage of welded connections between the longitudinal struts and the cross struts is the local weakening of the cross struts at the welds, which promotes fracture.

From the US 4,840,728 a vibration screening machine has become known in which the longitudinal struts are screwed to the cylindrical cross braces by means of U-shaped brackets to avoid stresses due to welds.

A disadvantage of this known Vibrationssiebmaschine, however, that the cylindrical cross braces have only a low stiffness in the loads occurring, so thick-walled cross braces must be used, which contribute to a high total weight of the vibratory machine. Another disadvantage is that the clamps are clamped by the tensile stress only in one direction on the crossbars, which can result in a continuous displacement of the mounting bracket by the constantly occurring vibrations during operation, resulting in undefined loading conditions or thinning.

It is therefore the object of the present invention to provide a screening machine which enables a reliable hold of the longitudinal struts on the cross struts and in which a relatively low weight of the cross struts is made possible with high durability.

This object is achieved by a device having the features of claim 1. Preferred developments are subject of the dependent claims.

The screening machine according to the invention is intended in particular for screening bulk materials and the like. The screening machine has a housing and at least two side walls, on which at least one screen deck is arranged. The screen deck has attached to the side walls cross struts and attached to the cross struts longitudinal struts on which a screen cover is added exchangeable or interchangeable. The longitudinal struts are clamped by releasable fastening anchor on the cross struts. The fastening anchors are clamped from two different directions to the cross braces to ensure a secure fit of the longitudinal struts to the crossbars even with continuous operation of a vibrating sieve.

The screening machine according to the invention has many advantages. With the screening machine according to the invention, a reduced failure frequency of the transverse struts is achieved with reduced total weight. The inventive clamping of the longitudinal struts by means of fastening anchors a firm connection between the longitudinal and the transverse struts is achieved without exposing the material of the cross struts by a welding process increased thermal stresses. Despite the clamp connection a reliable and durable attachment is achieved because the clamping takes place from two different directions.

In a preferred embodiment of the invention, the fastening anchor encloses the cross-brace by clamping and has two connecting means, a counter-plate and a holding plate, with which the screen lining is connected. The counter-plate can be manufactured or connected in one piece with a connecting means. On the retaining plate, the longitudinal strut is securely and releasably - indirectly or directly - attached.

Preferably, at least one and in particular substantially all transverse struts of the screening machine according to the invention have a substantially rectangular cross-section. It points a cross strut has a bottom, two side surfaces and a top side. Preferably, the height of the cross member is greater than the width of the cross member to achieve increased rigidity in the vertical direction. The vertical direction is the particularly loaded direction from which the material to be screened or classified falls back onto the screen surface.

Advantageously, the backing plate of the fastening anchor is pressed against an underside of the transverse strut to produce the clamping on the transverse strut in one direction.

Preferably, a fastening anchor comprises at least one clamping piece in order to ensure the clamping on the transverse strut. In particular, the clamping piece causes a clamping contact of the fastening anchor on a side surface or front or back of the cross member.

In particular, the clamping piece is used for a two-dimensional clamping, namely on the one hand to a clamping in the vertical direction by the backing plate pressed against the underside of the cross member and the retaining plate is pressed against the top of the cross member, as well as a clamping in the horizontal direction, in the the clamping piece is pressed against a side surface of the transverse strut to produce a particularly strong connection.

Preferably, the clamping piece comprises two mutually corresponding clamping parts, which have inclined sliding surfaces.

The connecting means of the fastening anchor are preferably hollow and serve to guide fastening screws, preferably with the screw heads on the counter-plate abut and extend with their threaded parts through the hollow connecting means and the holes of the retaining plate. On the top of the retaining plate, the protruding threads of the fastening screws are provided with nuts, and the fastening anchor is fastened to the transverse strut.

Between a connecting means and the holding plate, the clamping piece is preferably provided, which has two mutually corresponding clamping parts, which are provided with inclined sliding surfaces. Central through the clamping parts of the clamping piece, the fastening screw extends such that upon screwing the fastening screw, the two clamping parts of the clamping piece on the inclined clamping surfaces move against each other, wherein a clamping member is pressed against the side surface of the cross member. By tightening the fixing screw by means of the clamping piece is a length adjustment of a mounting leg and a clamping in the vertical direction and also a clamping in the horizontal direction of the mounting anchor on the cross member.

In all embodiments, the lateral distance between two different fastening anchors on a transverse strut is preferably adjustable. Preferably, a fastening anchor can be clamped at almost any desired point of a transverse strut. This makes it possible to use different screen modules as a screen covering. For example, the lateral distance can be set to a width of 30 cm. If necessary, the distance of 30 cm to e.g. 12 inches can be varied to use systems from the imperial or Anglo-Saxon measurement system.

This also makes it possible to offer the same machine dimensions for the Anglo-Saxon area or American and continental European space. Only at the assembly the fixing anchor is determined, which lateral distance is mounted.

At the same time it is possible to attach a wear protection device between two mounting anchors on a cross strut to protect the cross strut against shocks and shocks by the screened material.

Preferably, a fastening profile is arranged on at least one fastening anchor or on at least one connecting means, to which in turn at least one attachment can be fastened. In particular, the fastening profile is designed such that the attachment can be clamped to the fastening profile.

Particularly preferably, at least one attachment is a wear protection device, e.g. to protect the cross brace.

Such an embodiment offers very significant advantages. The cross straps of the sifter should be protected from impacts, bumps and abrasion by classified material which has passed through the sifting lining and could fall on or fall along the crossbeams to increase its life. If, however, fastening means for receiving wear protection elements are welded to the transverse struts, this weakens the structure of the cross struts. Therefore, an arrangement of wear protection elements on the fastening profile is very advantageous, especially if the wear protection elements are attached by clamping the fastening profiles, since then a simple replacement is possible.

The fastening profiles serve in particular as wear protection for the screws and are then hollow inside, to centrally receive the thread on the mounting profile.

In preferred developments, the counterplate supports the fastening profile from below. In particular, the counter plate prevents at least slipping off of the wear protection to protect the lateral surfaces of the transverse strut. For this purpose, the counter-plate may have lateral shoulders on which the particular approximately plate-shaped lateral wear protection can be supported.

Preferably, at least one attachment can also be attached to the retaining plate. In particular, at least one attachment is a wear protection device, which is designed in particular as an upper wear protection device for the top of the cross member. In particular, a generally approximately plate-shaped upper wear protection device has lateral protective elements which protrude downwards on the longitudinal sides in order to ensure overlapping of the upper wear protection device and the lateral wear protection devices, so that no bulk material passes between the upper and the lateral wear protection devices.

In all embodiments, the screening machine according to the invention is in particular designed such that the connection points of the transverse struts are arranged with the side walls on a grid with fixed pitch. As a result, a flexible and variably extensible construction of the screening machine according to the invention is achieved.

Further advantages and possible applications emerge from the exemplary embodiment which will be described below with reference to the enclosed figures:

Fig. 1

eine schematische perspektivische Ansicht einer erfindungsgemäßen Schwingmaschine;

Fig. 2

eine schematische Ansicht einer Seitenwand der Schwingsiebmaschine nach Fig. 1;

Fig. 3

eine schematische Seitenansicht der Seitenwand mit eingeblendetem Raster;

Fig. 4

eine teilweise geschnittene Seitenansicht der Schwingsiebmaschine nach Fig. 1;

Fig. 5

eine perspektivische Unteransicht eines Siebdecks bei weggelassener Seitenwand;

Fig. 6

eine Seitenansicht eines Befestigungsankers für die Längsstreben für eine Schwingsiebmaschine nach Fig. 1;

Fig. 7

einen stark schematischen vertikalen Querschnitt durch eine Querstrebe;

Fig. 8

einen weiteren schematischen Querschnitt durch eine Querstrebe mit sichtbarer Verstärkungseinheit;

Fig. 9

eine schematische perspektivische Aufsicht auf einen Teil der Maschine mit einer Querstrebe; und

Fig. 10

einen schematischen horizontalen Querschnitt durch eine Querstrebe.

Show:

Fig. 1

a schematic perspective view of a vibrating machine according to the invention;

Fig. 2

a schematic view of a side wall of the vibrating screen after Fig. 1 ;

Fig. 3

a schematic side view of the side wall with faded in grid;

Fig. 4

a partially sectioned side view of Schwingsiebmaschine after Fig. 1 ;

Fig. 5

a perspective bottom view of a screen deck with the side wall omitted;

Fig. 6

a side view of a fastening anchor for the longitudinal struts for a vibrating screen after Fig. 1 ;

Fig. 7

a highly schematic vertical cross section through a cross member;

Fig. 8

a further schematic cross section through a transverse strut with visible reinforcement unit;

Fig. 9

a schematic perspective view of a part of the machine with a cross strut; and

Fig. 10

a schematic horizontal cross section through a transverse strut.

With reference to the Fig. 1-10 Now, an embodiment of the present invention will be explained. In Fig. 1 is an overall view a screening machine 1 according to the invention shown, which is designed as Schwingsiebmaschine.

The screening machine 1 is here in the embodiment, in particular for classifying bulk material such. Gravel, grit, gravel, sand, building rubble or limestone used, but can also be intended for screening or classification of other bulk materials or serve.

The screening machine 1 has a housing 2 with side walls 3 and 4, between which in this example three screening decks 5, 6 and 7 are arranged. The screen covering 8 of a screen deck can be used as a tensioned wire mesh or as a perforated plate with e.g. downwards conically enlarging holes or in particular be designed as a rubber or plastic covering, are provided in accordance with the classification specification corresponding holes.

At the in perspective view Fig. 1 Rear end of the screening machine 1, a material supply 10 is provided at which the bulk material to be classified is supplied to the screening machine. The classified bulk material passes depending on the fine grain on the screen decks 6 or 7 or falls all the way down or remains on the screen deck 5 until it is on the respective Feinkornabfuhr 12 or 13 or the coarse grain 11 is derived.

The sifting machine 1 is designed here as a circular free-standing sifter and has a drive 19 and four resilient support systems 47, on which the screening machine 1 is mounted relative to the ground.

On the side walls 3 and 4 horizontal and vertical reinforcing units 29 and 28 are provided, which are designed as bent sheet metal profiles.

The reinforcement units 28, 29, which are approximately rectangular in cross-section, are formed on three sides by the bent metal sheets and on one side by the side walls 3, 4 of the screening machine 1 and increase the rigidity of the side walls considerably, so that a complicated doubling of the side walls in loaded areas can be omitted, which reduces the overall weight of the screening machine and the cost of materials and still increases the reinforcing effect.

The reinforcing units 28, 29, together with the transverse struts and the side walls, form reinforcing frames, of which only some reinforcing frames 61 to 64 are shown in FIG Fig. 1 are shown by thick dotted lines.

The reinforcing frame 61 is formed by two vertical reinforcing units 28 and by the three horizontal transverse struts 23 which hold the three screening decks 5, 6 and 7 at this longitudinal position. The vertical reinforcing frame 61 and the other vertical reinforcing frames in the other vertical reinforcing units 28 result in a particularly vibration-resistant construction of the screening machine 1.

Longitudinal reinforcing frames 62 and 63 are formed by the horizontal and longitudinal reinforcing units 29 and the transverse strut 23 associated with the respective screening deck 5 and 7, respectively. Further longitudinal reinforcement frames are formed by the further longitudinal reinforcement units 29 and the associated transverse strut 23, so that a high rigidity is achieved in this plane as well.

In the third dimension, lateral reinforcing frames are formed, of which the lateral reinforcing frame 64 is shown by way of example with a thick dotted line.

The existing in all three dimensions reinforcing frame 61 to 64 lead to a tremendous increase in the vibration stiffness of the screening machine 1, the weight increases only moderately.

This also contributes to the fact that individual screw simultaneously the cross member on the side wall and a reinforcing unit attach to the side panel so that optimum connection is achieved.

In the intended construction, the screening machine has a screen inclination angle 18, which in the exemplary embodiment is between about 10 and 30 degrees.

All fastening points 14 on the side wall 3 and the side wall 4 are aligned along a grid 15, which has grid points 16.

The grid points are aligned along an x-y coordinate system, wherein the x-coordinate x is aligned here parallel to the lower or upper edge of the side wall 3 and 4 respectively. The grid spacing 21 between two grid points in the x direction can be equal to the grid spacing 22 in the y direction, but can also be independent of the grid spacing 22 in the x direction.

The y-coordinate has to the x-coordinate system angle 17, which is here in the embodiment between about 60 and 80 degrees. Thus, there is no right-angled x, y coordinate system, but the angle is different between about 10 and 30 degrees of 90 degrees.

Here in the exemplary embodiment, all fastening points 14 are selected based on the grid points 16, it being noted that the grid points 16 may also be virtual points, so that not everyone in Fig. 3 shown grid point 16 must be visible on the side wall 3 or 4 of the screening machine.

In the screening machine 1, all attachment points 14 for attachment of the transverse struts 23 on the side walls 3, 4 are aligned with the grid, so that the axial distance of individual attachment points on a transverse strut 23 is equal to the multiple of the grid spacing.

Likewise, the distance in the x or y direction of an attachment point 14 of a transverse strut 23 to an attachment point 14 of another cross member 23 is equal to the multiple of the grid spacing, so that a modular and systematic design of the machine results, which allows a simple adaptation of other modules , because regardless of the size of the machine, the most diverse assemblies can be grown.

In Fig. 5 is a perspective bottom view of two transverse struts 23 at weggeschnittener side wall 3 is shown. The transverse struts 23 are fastened to the side wall 3 via flanges 32. At the transverse struts 23 25 fastening anchors 9 are provided in a respective lateral distance in order to connect the longitudinal struts 31 with the transverse struts 23 firmly, but releasably.

Due to the screwed connection between the longitudinal struts 31 and the cross braces 23 welding stresses are avoided, so that with a constant wall thickness of the cross braces 23 a higher reliability and durability can be achieved.

The attachment of a fastening anchor 9 to a cross member 23 is in Fig. 6 shown enlarged on average. Against the underside 23 a of the transverse strut 23, the counter-plate 37 is pressed by means of the clamping force of the screws 38. The screws 38 bear with their screw heads 39 on the underside of the counter-plate 37, while their threads extend upward, where they are performed through holes in the holding plate 34 and secured on top with nuts 46. Protective elements may be provided to protect the threaded ends and nuts 46 from damage due to falling classified material.

Attachment profiles 53 can be attached to the screws 38 in order to arrange wear protection elements thereon.

Between the connecting means designed as a fastening screw 38 and the lower edge of the holding plate 34 is a clamping piece 40 provided with clamping parts 41 and 42, which are each wedge-shaped, wherein the inclined surfaces slide on each other. Here in the exemplary embodiment, the clamping part 42 is formed integrally with the holding plate 34.

The fastening screw 38 extends through an axial hole in the clamping piece 40, so that when tightening the screw 38, the clamping member 41 moves axially in the direction of the holding plate 34, whereby the fastening part 41 is pressed against a side surface 23 b of the cross member 23. As a result, a double pressure is achieved, namely, on the one hand, the counter-plate 37 is pressed against the underside 23a of the cross member 23 and on the other hand, the clamping member 41 is pressed against the clamping part 42 of the holding plate 34 and against the side surface 23b of the cross member 23, so that a Particularly reliable fit of the mounting anchor 9 is achieved on the cross member 23. In addition, a corresponding clamping piece 40 may also be provided on the other side of the transverse strut 23 in order to exert pressure on the transverse strut 23 also from the other side.

The respective flange 32 fixed to the two ends of the transverse strut 23 has holes 23 through which screws are passed to connect the flange 32 to one of the side walls 3, 4.

The longitudinal struts 31 are connected by screws 44 and 45 with the holding plate 34. Each longitudinal strut 31 is here designed as a C-profile and extends in the longitudinal direction in each case from one transverse strut 23 to the next cross strut 23. A significant advantage of the screening machine 1 is that each longitudinal strut at each end 31a via two screw 44, 46 and 45, respectively 46 is connected to a fastening anchor 9 or to a transverse strut 23. This allows a transmission of bending moments from one longitudinal strut 31 to the next longitudinal strut 31, as well as on the transverse struts 23, whereby the vibration stiffness is increased.

On each transverse strut 23 wear protection devices 51 are provided on the side surfaces 23b as wear protection plates, which are clamped to fastening profiles 53. The fastening profiles 53 are clipped onto the threaded areas of the screws 38 with clip areas 53a and serve on the one hand as wear protection for the threaded areas of the screws 38 and on the other as profiles on which other components and in particular lateral wear protection plates 51 can be clamped. For this purpose, the fastening profiles 53 mushroom-shaped lugs 53b on each side, to which the wear protection plates 51 can be clamped with mushroom-shaped grooves.

On the upper side 23c of the transverse struts 23, upper wear protection plates 52 protect the cross strut against impacts, impacts or the direct abrasive attack of the bulk material. On the longitudinal sides, lateral protective strips 52a are provided on the upper wear protection plates 52 which project downwards and overlap the lateral wear protection plates 51 to securely prevent bulk material falling from above from the cavity 51b between lateral wear protection plates 51 and the transverse strut 23.

A slipping down of the only clamped side wear protection plates 51 is effectively prevented by widened paragraphs 37a on the backing plate 37, which support the side wear plates 51 optionally from below.

Both the lateral wear protection plates 51 and the upper lateral wear protection plates 52 are received on the mounting anchors, so that the fastening anchors 9 fulfill a double function in a very advantageous manner by supporting the screen covering on the longitudinal struts 31 and reliably protect the cross struts 23 from wear. In addition, the fact that each longitudinal strut is secured at each end 31 a with two screws on the fastening anchor 9, a rigid connection of the longitudinal struts 31 with each other and with the Cross struts 23 allows, which also contributes to the rigidity of the screening machine 1.

The screening machine shown in the embodiment allows a modular design and a modular expansion of the screening machine, with a variable screen width can be selected by the flexible attachment of the longitudinal struts 31 to the cross braces 23, which screen lining systems of different manufacturers can be used.

Claims (18)

Sieving machine (1), in particular for sieving bulk goods and the like,
with a housing (2) and at least two side walls (3, 4) on which at least one screen deck (5-7) is arranged,
wherein the screen deck (5-7) has transverse struts (23) fastened to the side walls (3, 4) and longitudinal struts (31) fastened to the cross struts (23), on which a screen covering (8) is exchangeably received,
characterized,
in that the longitudinal struts (31) are clamped on the transverse struts (23) from two different directions by means of releasable fastening anchors (9). The screening machine (1) according to claim 1, wherein the fastening anchor (9) clampingly surrounds the transverse strut (23) and comprises connecting means (38), a counter-plate (37) and a holding plate (34). Screening machine (1) according to claim 1 or 2, wherein the transverse struts (23) have a rectangular cross section with a bottom (23a) and two side surfaces (23b). Screening machine (1) according to the preceding claim, wherein the counter-plate (37) is pressed against a lower side (23a) of the transverse strut (23). Screening machine (1) according to one of the preceding claims, wherein at least one connecting means (38), a clamping piece (40) is provided. Screening machine (1) according to one of the preceding claims, wherein the clamping piece (40) is pressed against a side surface (23b) of the transverse strut (23). Screening machine (1) according to the preceding claim, wherein the clamping piece (40) comprises two mutually corresponding inclined sliding surfaces (41, 42). Screening machine (1) according to one of the preceding claims, wherein the connecting means (38) are designed as fastening screws. Screening machine (1) according to one of the preceding claims, wherein the screw heads (39) or nuts rest against the counterplate (37). Screening machine (1) according to one of the preceding claims, wherein the lateral distance between two fastening anchors (9) on a transverse strut (23) is adjustable. Screening machine (1) according to one of the preceding claims, wherein a wear protection device (43) is accommodated between two fastening anchors (9) of a transverse strut (23). Screening machine (1) according to one of the preceding claims, wherein a fastening profile is arranged on a connecting means, to which at least one attachment can be attached. Screening machine (1) according to the preceding claim, wherein the fastening profile is formed so that the attachment can be clamped. Screening machine (1) according to one of the preceding claims 12 or 13, wherein at least one attachment is a wear protection device. Screening machine (1) according to one of the preceding claims 12 to 14, wherein the counter-plate supports the fastening profile from below. Screening machine (1) according to one of the preceding claims, wherein an attachment can be attached to the holding plate (34). Screening machine (1) according to the preceding claim, wherein at least one attachment is a wear protection device. Screening machine (1) according to one of the preceding claims, wherein the attachment points (14) of the transverse struts (23) on the side walls on a fixed grid (15) are arranged.

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