Spiral shaft screening device

Abstract

Spiral wave sieve device (1) comprising the following: several spiral wave screen modules (50), each comprising several rotatable spiral shafts (10, 20, 30, 40) whose axes of rotation (11, 21, 31, 41) are arranged parallel to each other and form a conveying plane (E), wherein the spiral wave screen modules (50) are configured to separate a material mixture into at least a first fraction (I), a second fraction (II) and a third fraction (III) and to transport the first fraction (I) along the conveying plane (E) in a first conveying direction (x) transverse to the axes of rotation (11, 21, 31, 41) and the second fraction (II) along the conveying plane (E) in a second conveying direction (y) along the axes of rotation (11, 21, 31, 41), wherein screen gaps are formed between the spiral waves (10, 20, 30, 40) through which the third fraction (III) is discharged in a third conveying direction (z), in particular the direction of gravity, transverse to the conveying plane (E), wherein the spiral wave screen modules (50) are arranged successively in the first conveying direction (x) transverse to the axes of rotation (11, 21, 31, 41) and the conveying plane (E) of a spiral wave screen module (50) following in the first conveying direction (x) is arranged or movable in the direction of gravity offset downwards with respect to the conveying plane (E) of the preceding spiral wave screen module (50).

Description

[0001] The invention relates to a spiral wave sieve device with which, for example, solid mixtures such as waste, municipal waste or natural stones, in particular cardboard and paper, can be sorted, in particular divided into different fractions.

[0002] European patent EP 1 570 919 B1 discloses a spiral wave screen for sorting essentially solid materials, particularly waste. The screen separates the material to be sorted into three fractions: long pieces, cubic pieces, and small pieces. It comprises several interlocking spiral rollers rotating about their longitudinal axis and arranged parallel to each other, at least approximately in the same plane. The material to be sorted is fed laterally to the spiral rollers via a feed device. The rotating spiral rollers convey long pieces transversely to the axial direction of the spiral rollers in a first conveying direction. Cubic pieces are conveyed longitudinally to the axial direction of the spiral rollers in a second conveying direction by the design and rotation of the spiral rollers, resulting in a separation into two fractions above or within the conveying plane of the spiral rollers.The material is separated into a long fraction and a fraction of cubic parts. Smaller parts fall through the gaps between the spiral rollers and form the third fraction.

[0003] US patent US 10,406,560 B1 describes a spiral wave screen device with multiple interlocking spiral waves. The spiral waves have a hub and a helical structure projecting from the hub surface, which winds at least 360° around the longitudinal axis of the spiral wave. The outer edge of the helical section and the hub surface of the interlocking spiral waves can, for example, be polygonal and aligned such that the gap formed between the outer edge of the helical section and the hub surface remains essentially constant when the waves are rotated in the same direction. This design, for example, polygonal, enhances the screening effect. Given the complex geometry of the outer edge of the helical section and the hub surface, manufacturing the spiral waves is challenging.Furthermore, it is necessary that the adjacent, interlocking spiral shafts be precisely aligned with each other in terms of their relative angular position in order to keep the gap between the outer edge of the helix and the hub surface essentially constant, which makes changes to the sieve width to adjust the fractions impossible.

[0004] The invention is based on the objective of providing a spiral wave screen device that is simple and cost-effective to manufacture and offers efficient screening performance. In particular, the spiral wave screen device should also be flexibly adaptable to the material to be sorted and / or with regard to the sizes of the fractions into which the material to be sorted is to be separated.

[0005] The problem is solved by the spiral wave sieve device according to claim 1. Advantageous embodiments are described in the dependent claims, the description, and the figures.

[0006] The invention relates to a spiral wave screen device with which, in particular, mixtures of solids (hereinafter referred to as "material to be sorted"), such as cardboard, paper, waste, municipal solid waste, or natural stones, can be sorted, especially into different fractions. The material to be sorted can be sorted with the spiral wave screen device, for example, according to size and / or shape. With the spiral wave screen device, the material to be sorted can be separated, for example, into three fractions, in particular long pieces, cubic pieces, and small pieces – similar to EP 1 570 919 B1. The spiral wave screen device comprises several spiral waves, which are assigned to one or more spiral wave screen modules, each of the spiral waves being rotatable about an associated axis of rotation. The axis of rotation of each spiral wave corresponds to its longitudinal or central axis.The material to be sorted can be fed onto the spiral shafts laterally via a feeding device, either to the side of the spiral shafts or to their axes of rotation. The rotating spiral shafts convey a first fraction, particularly elongated pieces, transversely to the direction of the spiral shafts' axes of rotation in a first conveying direction. A second fraction, particularly cubical pieces, is conveyed longitudinally to the direction of the spiral shafts' axes of rotation in a second conveying direction, resulting in a separation into two fractions above or within the conveying plane of the spiral rollers, such as a fraction of elongated pieces and a fraction of cubical pieces. Smaller pieces fall downwards through the spaces between the spiral shafts due to gravity, forming the third fraction.

[0007] The spiral wave screen device comprises several spiral wave screen modules, each containing several spiral wave modules that are rotatable about their axes of rotation or that rotate during operation. Each spiral wave has an axis of rotation about which it can rotate. The spiral wave modules, or rather their axes of rotation, are arranged parallel to each other.

[0008] For example, multiple spiral shafts can be provided per spiral shaft screen module, such as at least two, exactly two, exactly three, exactly four, or exactly five spiral shafts per spiral shaft screen module. For example, multiple spiral shaft screen modules can be provided that have a different number of spiral shafts. Alternatively, the spiral shaft screen modules can have the same number of spiral shafts.

[0009] A first spiral shaft can have a first axis of rotation, a second spiral shaft a second axis of rotation, an optionally provided third spiral shaft a third axis of rotation, and an optionally provided fourth spiral shaft a fourth axis of rotation, and so on. The axes of rotation of the spiral shafts within a spiral shaft screen module can be arranged parallel to each other and preferably in a common plane, which may correspond to, or at least approximately correspond to, the conveying plane or be parallel to it. In particular, the axes of rotation of the spiral shafts of one spiral shaft screen module can be arranged parallel to the axes of rotation of another or all other spiral shaft screen modules. The plane in which the axes of rotation of one spiral shaft screen module lie can be offset, in particular parallel to, the plane in which the axes of rotation of another, in particular adjacent, spiral shaft screen module lie.This allows the material to be sorted, which is transported at a module outlet in one conveying direction, particularly the first conveying direction, with a height offset to the module inlet of the subsequent spiral wave screen module. This allows the material to be accelerated by gravity and fall from one spiral wave screen module onto the next, where it is separated upon impact. This impact and separation process allows the material to be even more effectively divided into individual fractions.

[0010] In general, the spiral wave screen modules can be arranged successively in a conveying direction, particularly in a first conveying direction, transversely to the axes of rotation, wherein a conveying plane, i.e., the plane in which the material to be sorted is transported and sorted by means of the spiral waves, is arranged, particularly in a first and second conveying direction, offset downwards in the direction of gravity with respect to the conveying plane, particularly at a module outlet, of a preceding spiral wave screen module. This allows the material to be separated by the up-and-down movement in the direction of gravity and then divided into fractions.

[0011] The first conveying direction, in which a first fraction is transported along the conveying plane, extends transversely, and in particular perpendicularly, to the axes of rotation. The second conveying direction, in which a second fraction is transported along the conveying plane, extends along, and in particular parallel to, the axes of rotation. A third conveying direction extends in the direction of gravity transversely to the axes of rotation, i.e., in the direction in which the third fraction falls downwards through the screen gaps formed between the spiral shafts. The material to be sorted can be divided into three fractions by the spiral shaft screen device based on its size and / or geometry: a first fraction in the first conveying direction, a second fraction in the second conveying direction, and a third fraction in the third conveying direction.The first fraction may, for example, contain predominantly elongated components, while the second fraction contains predominantly round or more cuboid or cube-shaped components. Smaller components are conveyed in the third direction by gravity and fall through the sieve gaps between the spiral shafts.

[0012] The spiral shaft has a hub, in particular cylindrical or circular cylindrical, from the outer surface of which a helix protrudes radially and winds along and around the longitudinal axis for at least one revolution, preferably for several revolutions.

[0013] The spiral shafts can be mounted so as to rotate freely around their respective axis of rotation and can have a free end. Each spiral shaft can be mounted so as to rotate freely at the end opposite the free end, in particular by means of one or more rotary bearings and / or on the side where a drive or gearbox of the spiral shaft screen module is located.

[0014] Each spiral wave screen module can have a drive, in particular a motor, such as an electric motor, with which the spiral wave shafts of the spiral wave screen module can be driven, in particular via a gearbox. Alternatively, one drive, in particular a motor, such as an electric motor, can be provided for several spiral wave screen modules, which can drive the spiral wave shafts of several spiral wave screen modules via a gearbox.

[0015] The gearbox can have a traction drive, such as a chain or belt drive, with a circulating traction element, for example, a chain or a belt. The traction element couples the drive to the spiral shafts, or at least a portion of the spiral shafts per spiral shaft screen module, in such a way that rotation of the drive is transmitted to the spiral shafts. A chain drive has the advantage over a belt drive that it is slip-free and the spiral shafts can be positioned at a defined angular angle to each other.

[0016] Each of the spiral shaft modules can have a module frame on which the spiral shafts are rotatably mounted, and in embodiments may include the motor and gearbox, which, for example, form a motor-gearbox unit.

[0017] For example, a control system can be configured to separately control the rotational speed of the drives of the spiral wave screen modules. Specifically, the control system can be configured so that the spiral waves of a preceding spiral wave screen module rotate at a different speed—that is, a higher or lower speed—than the spiral waves of the subsequent spiral wave screen module. This allows the material to be accelerated or decelerated during the transition from one spiral wave screen module to the next, thereby separating and efficiently sorting the material. For instance, the material can be separated if the spiral waves of a spiral wave screen module rotate at a higher speed than those of the preceding spiral wave screen module.Alternatively, the material to be sorted can be accumulated, for example, if the spiral shafts of a spiral shaft screen module have a lower rotational speed than the preceding spiral shaft screen module. This allows acceleration of the material to be sorted not only in the direction of gravity, but also perpendicular to it in the first and second conveying directions.

[0018] Depending on the nature of the material to be sorted, the rotational speed of the spiral shafts and / or the speed difference between the spiral shafts of different spiral shaft screen modules can be adjusted. This makes the system more flexible overall and adaptable to the material being sorted, especially if a separate motor is provided for each spiral shaft screen module to drive the spiral shafts of that module.

[0019] Further training systems may include at least one actuator that allows the inclination of the conveying planes of the spiral wave screen modules, or of the plane in which the axes of rotation of the spiral waves of a spiral wave screen module lie, to be changed relative to the horizontal plane of gravity. This allows, for example, the adjustment of the drop height with which the material to be sorted falls from the module outlet of an preceding spiral wave screen module onto the module inlet of a subsequent spiral wave screen module.

[0020] For example, each spiral wave screen module can be equipped with an actuator so that the spiral wave screen modules can be adjusted or pivoted separately with respect to the inclination of their respective conveying plane, particularly by means of a control system. The actuator can be arranged between the module frame of its spiral wave screen module on the one hand and, for example, a main frame or a machine frame on which the spiral wave screen modules are pivotably mounted relative to it, in order to adjust the inclination of the spiral wave screen modules with respect to the main frame and the horizontal. For example, the spiral wave screen modules can be adjusted by means of the actuator(s) so that they can be moved between a position in which the conveying planes of the spiral wave screen modules form a common conveying plane and / or the axes of rotation of the spiral shafts of several spiral wave screen modules lie in a common plane.In particular, the spiral wave screen modules can be moved from this position to a position in which the conveying plane at the module inlet of a subsequent spiral wave screen module is offset downwards in the direction of gravity relative to the conveying plane at the module outlet of a preceding spiral wave screen module by means of the at least one actuator. The spiral wave screen modules can be moved back and forth between these positions by means of the at least one actuator, in particular to achieve optimal separation and sorting depending on the properties of the material to be sorted.

[0021] For example, each spiral wave screen module can have a pivot axis about which it can be pivoted by means of its own or a common actuator. The pivot axis can be formed by a pivot bearing located between the respective spiral wave screen module, in particular its module frame, and a main frame or machine base. For example, a separate actuator can be provided for each spiral wave screen module. This allows the spiral wave screen modules to be flexibly adjusted with respect to their inclination relative to the horizontal and to each other. Alternatively, a common actuator can be provided for several spiral wave screen modules. This reduces the number of actuators required, which can contribute to cost savings.

[0022] For example, the spiral wave screen device can have the main frame on which the spiral wave screen modules can pivot, in particular about their respective pivot axis in relation to the frame.

[0023] Alternatively, the spiral wave screen modules can be fixedly mounted on the main frame, with the inclination of the conveying plane or the plane in which the axes of rotation of a spiral wave screen module are arranged being adjusted by means of the actuator, which can adjust the main frame. For example, the main frame can have a pivot axis about which it can be pivoted by means of its actuator, together with the spiral wave screen modules, which are not moved relative to each other. The pivot axis can, for example, be arranged parallel to one of the axes of rotation of the spiral wave screen modules. The pivot axis can be formed by a pivot bearing arranged between the main frame and a machine frame. The actuator can be arranged between the main frame and the machine frame to pivot the main frame relative to the machine frame.

[0024] In advanced training systems, at least one of the modules can have at least two or exactly two spiral shafts coupled to the drive in such a way that they can be driven at the same speed. The two spiral shafts can be so close to each other in terms of their axial distance that the helixes of the two spiral shafts interlock. Alternatively, they can be spaced apart so that they do not interlock, in which case the same speed is not necessarily required.

[0025] For example, in the case of two spiral shafts coupled to the drive so that they can be driven at the same speed, an adjusting device, in particular a rotary angle adjusting device, can be provided with which a relative angular position between the spiral shafts can be set. The adjusting device can, for example, be contained in or arranged in a gearbox provided between the two spiral shafts and the drive.In a transmission designed as a traction drive, particularly a chain drive, the adjusting device can include an adjusting element, such as a sliding element, a wheel, or a sprocket, which can act on the section of the traction element located between a drive wheel of one spiral shaft and a drive wheel of the other spiral shaft. This section is adjustable transversely to its direction of travel, allowing it to be deflected transversely to its direction of travel, thereby changing its length. This change in the length of the section, in turn, alters the relative angular position between the drive wheels and thus between the two spiral shafts.

[0026] When the helixes of two adjacent spiral shafts interlock, a gap exists between the helixes of one and the other. This gap, referred to as the screen gap, determines the size of the screen gap, which fraction of the material to be sorted (the third fraction) passes through the screen plane and which fraction is conveyed in the second direction. If the two spiral shafts operate at the same speed, the size of the screen gap remains constant. However, if the angular position of one spiral shaft is changed relative to the angular position of the other, the size of the screen gap between the helixes of the two spiral shafts changes. This allows the screen gap to be increased or decreased, particularly by moving the adjustable adjusting element. This can be done while the spiral shaft screening device is stationary or, alternatively, during operation.Thus, the spiral wave sieve device is flexible and adaptable to the material to be sorted and its sieve width.

[0027] For example, at least one of the spiral wave screen modules can have at least a first, second, third, and fourth spiral wave in the conveying direction, particularly the first conveying direction, wherein each spiral wave has a helix projecting radially from the wave and winding around and along the axis of rotation, with a gap formed between adjacent helix turns, wherein the helixes of the first and second spiral waves mutually engage in their gaps, and the helixes of the third and fourth spiral waves mutually engage in their gaps. The third and subsequent spiral waves can be spaced so far apart that their helixes do not or also engage with each other.Further developments may include at least one adjustment device, particularly one mentioned above, with which a relative angular position between the first and second spiral shafts and / or the third and fourth spiral shafts and / or between the second and third spiral shafts can be adjusted. A first such adjustment device may be provided for adjusting the relative angular position between the first and second spiral shafts, and a second such adjustment device may be provided for adjusting the relative angular position between the third and fourth spiral shafts. Optionally, a third such adjustment device may be provided between the second and third spiral shafts for adjusting the relative angular position between the second and third spiral shafts.

[0028] The invention has been described with reference to several examples and embodiments. Embodiments of the invention are described below with reference to figures. The features disclosed therein advantageously further define the subject matter of the claims individually and in any combination thereof. The figures show: Fig. 1 a perspective view of a spiral wave sieve device, Fig. 2 a side view of the spiral shaft sieve device in a first configuration, Fig. 3 a side view of the spiral shaft sieve device in a second configuration, Fig. 4 a side view of the spiral shaft sieve device in a third configuration, Fig. 5 a top view of several spiral waves, Fig. 6 the view from Fig. 5 spiral shafts with their rotational angular positions offset from each other, Fig. 7 a top view of several spiral shafts in a further embodiment and Fig. 8 the view from Fig. 7 spiral shafts with their rotation angle positions shifted relative to each other.

[0029] The Fig. Figure 1 generally shows a spiral wave screen device 1, which includes a feed device 2, designed as a conveyor belt in the example shown, and a [missing element] in the material flow direction (see arrow at the feed device in Figure 1). Fig. 1) The feed device 2 has a screen shaft unit 3 downstream of it. The feed device 2 supplies the material to be sorted to the screen shaft unit 3. The feed device 2, designed as a conveyor belt, has, for example, a frame on which rollers, one or more of which are rotatably driven by a motor 7, such as an electric motor, are rotatably mounted. An endless conveyor belt 8 is arranged on the rollers, and the rotation of the rotatably driven rollers conveys the material to be sorted, located on the upper side of the conveyor belt 8, to the screen shaft unit 3. At the end of the feed device 2 or the conveyor belt 8 facing the screen shaft unit 3, the material to be sorted is guided onto the screen shaft unit 3, in particular, discharged.This end can be arranged in the direction of gravity above a conveying level E of the screen shaft unit 3 in order to drop the material to be sorted onto the screen shaft unit 3. Alternatively, as in the . Fig. Figures 2 to 4 show that the end should be positioned at approximately the same height as the conveyor level E if discharge is not desired. The screen shaft unit 3 is designed to divide the material to be sorted into several fractions, such as three or at least three, and to transport and discharge the divided fractions in different directions and / or at different locations, thus separating them from one another.

[0030] A first fraction I is separated by the sieve wave unit 3 in a first direction (x-direction), a second fraction in a second direction (y-direction), and a third fraction in a third direction (z-direction), as shown in Fig. Figure 1 shows the output. The screen shaft unit 3 comprises several spiral screen shaft modules 50, each having several rotatable spiral shafts 10, 20, 30, 40. In the example shown, each spiral screen shaft module 50 has four spiral shafts 10, 20, 30, 40. Alternatively, versions with fewer, such as two or three, or more, such as five, spiral shafts per spiral screen shaft module 50 are possible. A first spiral shaft 10 is rotatable about a first axis of rotation 11, a second spiral shaft 20 about a second axis of rotation 21, a third spiral shaft 30 about a third axis of rotation 31, and a fourth spiral shaft 40 about a fourth axis of rotation 41. The axes of rotation 11, 21, 31, 41 of the spiral shafts 10, 20, 30, 40 of a spiral screen shaft module 50 are arranged parallel to each other and lie in a common plane.

[0031] Each of the spiral wave screen modules 50 has a module frame 51 and a motor-gearbox unit 52 attached to it for driving the spiral shafts 10, 20, 30, 40. The spiral shafts 10, 20, 30, 40 have a free end and are rotatably mounted on the module frame 51 about the respective axis of rotation 11, 21, 31, 41 by means of at least one rotary bearing, such as two rotary bearings, in particular a fixed bearing and a floating bearing, or a support bearing arrangement with two rotary bearings, e.g., in an O-arrangement. The motor-gearbox unit 52 is arranged on the side of the spiral wave screen module 50 or the module frame 51 where it is located. Between the free end and the side where the spiral shafts 10, 20, 30, 40 are mounted or the motor-gear unit 52, the spiral shafts each have helixes 13, 23, 33, 43.The spiral shafts 10, 20, 30, 40 are supported without bearings, meaning that the free end is not supported by bearings. By rotating the spiral shafts 10, 20, 30, 40 using the motor of the motor-gearbox unit 521, a portion of the material to be sorted, namely a second fraction, is transported in the y-direction towards the free end and discharged there. The discharge occurs when the second fraction falls from the free end, for example, onto a conveyor that removes the second fraction, or into a container or storage area where the second fraction is temporarily stored. In the example shown, the free ends of the spiral shafts 10, 20, 30, 40 of the spiral shaft screen modules 50 are arranged on the same side of the screen shaft unit 3. This allows the spiral shaft screen modules 50 to discharge the second fraction II in the same direction, here the y-direction.

[0032] A first fraction I of the material to be sorted is placed in conveying levels E (see e.g. Fig. 2 to 4) are transported by means of the rotating spiral shafts 10, 20, 30, 40 in the x-direction, which is perpendicular to the axes of rotation 11, 21, 31, 41, and discharged at the end of the last spiral shaft screen module 50. The discharge occurs when the second fraction falls from the last or fourth spiral shaft 40 of the last spiral shaft screen module 50, for example, onto a conveyor that transports the first fraction away, or into a container or storage area where the first fraction is temporarily stored.

[0033] During transport of the material to be sorted over the screen shaft unit 3, the material is separated and sorted according to size and / or geometry into a first fraction I and a second fraction II, which are discharged in the x and y directions, respectively. A third fraction III, consisting of smaller parts than the first and second fractions, is sorted out during transport over the screen shaft unit 3 by falling in the z direction (direction of gravity) through the gaps between the spiral shafts 10, 20, 30, 40, specifically onto a conveyor, into a container, or into a storage area where the third fraction is temporarily stored.

[0034] The spiral waves 10, 20, 30, 40 exhibit, as for example in the Fig. Figures 5 to 8 each show a circular cylindrical hub 12, 22, 32, 42, whose central axis is the axis of rotation 11, 21, 31, 41 of the respective spiral shaft 10, 20, 30, 40. A helix 13, 23, 33, 43 projects radially from the hub 12, 22, 32, 42 and winds around it and along the axis of rotation 11, 21, 31, 41 with a pitch P, in particular in a helical shape. The pitch P is the distance that the helix 13, 23, 33, 43 travels in one revolution. The helix 12, 22, 32, 42 extends to the free end of the spiral shaft 10, 20, 30, 40, specifically over the entire effective length of the respective spiral shaft 10, 20, 30, 40. In the examples shown, the spiral shafts 10, 20, 30, 40 each have a single, multi-turn helix 13, 23, 33, 43. Alternatively, the spiral shafts 10, 20, 30, 40 can each have several multi-turn helixes 13, 23, 33, 43, similar to a multi-start thread.

[0035] Between adjacent spiral shafts 10, 20, 30, 40, sieve gaps are formed, the sieve widths of which determine the size of the proportions of the material to be sorted that are assigned to the individual fractions.

[0036] The spiral shafts 10, 20, 30, 40 can be set in rotation by means of a drive, in particular a motor. For example, a common drive, such as an electric motor, can be provided that drives the spiral shafts 10, 20, 30, 40 of all or at least several spiral shaft screen modules 50, for example via a gearbox that transmits the rotation of the drive to the spiral shaft screen modules 50, in particular the spiral shafts 10, 20, 30, 40. In the example shown, however, the spiral shaft screen modules 50 each have a drive, similar to drive 7, such as an electric motor, with which the spiral shafts 10, 20, 30, 40 of the spiral shaft screen module 50 to which the drive belongs are driven or – more specifically – rotated, for example via a gearbox. The gearbox and / or the drive are arranged in a gearbox and drive housing of the spiral shaft screen module 50 and form the motor-gearbox unit 52.The rotation of the drive, in particular an electric motor, is transmitted via the gearbox to the spiral shafts 10, 20, 30, 40, in particular by reduction, meaning that the spiral shafts 10, 20, 30, 40 have a lower rotational speed than the drive. Preferably, the spiral shafts 10, 20, 30, 40 of a spiral shaft screen module 50 can be coupled to each other and / or to the drive in such a way that they rotate at the same speed.

[0037] For example, the spiral wave screen device 1 can be configured such that the spiral shafts 10, 20, 30, 40 of a spiral wave screen module 50 rotate at the same speed during operation as the spiral shafts 10, 20, 30, 40 of an adjacent, in particular a preceding and / or subsequent, spiral wave screen module 50 or all other spiral wave screen modules 50. Alternatively, the spiral wave screen device 1 can be configured such that the spiral shafts 10, 20, 30, 40 of a spiral wave screen module 50 rotate at a different, in particular a higher or lower, speed during operation than the spiral shafts 10, 20, 30, 40 of an adjacent, in particular a preceding or subsequent, spiral wave screen module 50. The material to be sorted can, for example, be separated if the spiral shafts 10, 20, 30, 40 of a spiral wave screen module 50 rotate at a higher speed than the previous spiral wave sieve module 50.Alternatively, the material to be sorted can be accumulated, for example, if the spiral shafts 10, 20, 30, 40 of a spiral shaft screen module 50 rotate at a lower speed than the preceding spiral shaft screen module 50.

[0038] The Fig. Figures 2 to 4 show further developments of the device. Fig. 1. The module inlet of the spiral wave screen module 50, which immediately follows the feed device 2, is in the versions from the Fig. 1 to 4 are arranged at approximately the same height as the end of the feed unit 2 facing the screen shaft unit 3. This allows the material to be gently discharged from the feed unit 2 onto the screen shaft unit 3. Alternatively, if the module inlet of the spiral shaft screen module 50, which immediately follows the feed unit 2, is arranged lower than the end of the feed unit 2 facing the screen shaft unit 3, the material to be sorted can fall from the feed unit 2 onto the spiral shaft screen module 50 and thus be discharged less gently onto the screen shaft unit 3, resulting in increased separation of the material to be sorted.

[0039] In the Fig. In the embodiment shown in Figure 2, the conveying plane E of the respective spiral wave screen module 50 has an angle greater than 0° and less than 15° or less than 10° with respect to the horizontal, for example, an angle of 7°. This arrangement lifts the material to be sorted against the direction of gravity during transport through the spiral wave screen module 50 in the first conveying direction (x-direction). The module inlet of the immediately following spiral wave screen module 50 is – as shown in the Fig. 2, Fig. 3 and Fig. Figure 5 shows the spiral wave screen module 50, offset downwards in the direction of gravity relative to its discharge. This causes the material to be sorted, transported in the first conveying direction (x-direction), to fall by gravity from the discharge of one spiral wave screen module 50 onto the inlet of the following spiral wave screen module 50. This separates the material, allowing it to be further separated into its fractions by the action of the spiral waves 10, 20, 30, 40 as described herein. By arranging a sufficient number of spiral wave screen modules 50 in succession in the first conveying direction, the process of the material falling from the discharge of one spiral wave screen module 50 onto the inlet of the following spiral wave screen module 50 can be repeated multiple times.The module outlet of the last spiral wave screen module 50 arranged in the first conveying direction can be arranged higher or at the same height in the direction of gravity with respect to the end of the feed device 2.

[0040] In the Fig. In the embodiment shown in Figure 3, the conveying planes E of the spiral wave screen modules 50 have an angle of 0° or approximately 0° with respect to the horizontal, i.e., that the conveying planes E run parallel to the horizontal with respect to the direction of gravity. This arrangement prevents the material to be sorted from being lifted during transport through the spiral wave screen module 50 in the first conveying direction (x-direction) against the direction of gravity. Instead, the material to be sorted is conveyed in the conveying plane E in the first conveying direction parallel to the horizontal through the respective spiral wave screen module 50. The module inlet of the subsequent spiral wave screen module 50 is – as shown in the Fig. Figure 3 shows the spiral wave screen module 50 being offset downwards in the direction of gravity relative to its discharge. This causes the material to be sorted, transported in the first conveying direction (x-direction), to fall by gravity from the discharge of one spiral wave screen module 50 onto the inlet of the following spiral wave screen module 50. This separates the material, allowing it to be further separated into its fractions by the action of the spiral waves 10, 20, 30, 40 as described herein. By arranging a sufficient number of spiral wave screen modules 50 in succession in the first conveying direction, the process of the material falling from the discharge of one spiral wave screen module 50 onto the inlet of the following spiral wave screen module 50 can be repeated multiple times.The module outlet of the last spiral wave screen module 50 arranged in the first conveying direction can be arranged lower in the direction of gravity with respect to the end of the feed device 2.

[0041] In the Fig. In the embodiment shown in Figure 4, the conveying planes E of the spiral wave screen modules 50 have an angle of 0° or approximately 0° with respect to the horizontal, i.e., that the conveying planes run parallel to the horizontal with respect to the direction of gravity, with the spiral wave screen modules 50 being arranged such that their conveying planes E form a common conveying plane E. This arrangement prevents the material to be sorted from being lifted during transport through the spiral wave screen module 50 in the first conveying direction (x-direction) against the direction of gravity. Instead, the material to be sorted is conveyed in the conveying plane E in the first conveying direction parallel to the horizontal through the respective spiral wave screen module 50. The module inlet of a subsequent spiral wave screen module 50 is – as shown in the Fig. Figure 3 shows the spiral wave screen module 50 being at the same height in the direction of gravity with respect to the module outlet of the preceding spiral wave screen module 50. This ensures a gentle transfer from one spiral wave screen module 50 to the following spiral wave screen module 50.

[0042] In the in the Fig. 2 to 4 shown embodiments of the device Fig. 1. The spiral wave screen modules 50 or their module frames 52 can be fixedly arranged on a main frame 4 of the screen shaft unit 3, for example a common one, meaning that they are fixed with respect to the frame 4 regarding the inclination of their respective conveying plane E and cannot be adjusted. The screen shaft unit 3 can be configured according to the configuration in Fig. 2, Fig. 3 or Fig. 4. The device can be constructed without the inclination of the conveyor levels E being adjustable. This makes the device less flexible in adapting to the material being sorted, but it is more cost-effective to manufacture compared to designs where the inclination of the conveyor levels E is adjustable, for example by means of an actuator 6, 53.

[0043] In further developments, the spiral wave screen modules 50 can be arranged such that they can be adjusted or pivoted with respect to the inclination of their respective conveying plane E in the first conveying direction relative to the horizontal. This can be implemented by opening a locking element, such as a clamp or a screw, and adjusting the inclination of the conveying plane E, for example by pivoting the main frame 4 and / or the module frame 51 of the spiral wave screen modules 50 about a pivot axis S, S 50can be pivoted. Alternatively, this can be implemented by providing at least one actuator 6, 53, such as at least one pneumatic or hydraulic cylinder or a spindle drive, with which the inclination of the conveying plane E can be adjusted, in particular steplessly, for example by pivoting the main frame 4 or the spiral wave screen modules 50 or their respective module frames 53 about a pivot axis S, S 50 be swung.

[0044] In one embodiment of the spiral wave screen device 1, the main frame 4, including the spiral wave screen modules 50 arranged thereon, can be made from between the Fig. 2 and Fig. The spiral wave screen 1, as shown in Figure 3, can be pivoted back and forth about a pivot axis S relative to the machine frame 5 or a foundation on which the spiral wave screen 1 is mounted, i.e., pivoted so that the conveying planes E are adjusted in their inclination with respect to the horizontal. By means of an actuator 6, in particular attached to the main frame 4, such as a pneumatic or hydraulic cylinder or a spindle drive, the main frame 4, including the spiral wave screen modules 50 arranged thereon, can be pivoted so that the conveying planes E are adjusted in their inclination with respect to the horizontal. By means of the actuator 6, the frame 4 can be adjusted, for example, between angles of 0° and 10° or 0° and 15° with respect to the horizontal, in particular steplessly. This allows the screen unit 3 to be flexibly adapted to different material mixtures to be sorted.

[0045] Alternatively or additionally, the spiral wave screen modules 50 can be arranged on the main frame 4 such that, with respect to the main frame 4, they are positioned with respect to the inclination of the conveying planes E between the sections in the Fig. 2 and Fig. The 4 positions shown are adjustable, especially around the swivel axes S 50 swiveling. Each of the spiral wave screen modules 50 or their respective module frame 51 can be swiveled about a pivot axis S provided for each spiral wave screen module 50. 50 be pivotably arranged on the main frame 4. The pivot axis S 50The pivot bearing can be formed by a pivot bearing located on the main frame 4 and the respective spiral wave screen module 50 or the respective module frame 51. By means of an actuator or actuators 53, such as a pneumatic or hydraulic cylinder or a spindle drive, one or more, preferably all, spiral wave screen modules 50 or their module frames 51 can be pivoted about the respective pivot axis S. 50 The conveying plane E of each spiral shaft screen module 50 can be pivoted so that its inclination relative to the horizontal is adjusted. The pivot axes S 50 The 50 spiral wave screen modules are arranged parallel to each other. The pivot axes S 50 In the example shown, they are arranged parallel to the pivot axis S.

[0046] In the Fig. 4 The conveying planes E have an angle of 0° with respect to the horizontal. In particular, the spiral wave screen modules 50 can be pivoted into a position such as the one shown in Fig. Figure 4 shows the conveying levels E of the spiral wave screen modules 50 forming a common conveying level E. In this position, as shown in Fig. Figure 4 shows that the conveying plane E has an angle of 0° with respect to the horizontal, or alternatively another angle, for example between 0° and 15° or 0° and 10°. By means of the actuator 53 or actuators 53, the spiral wave screen modules 50 can be adjusted, for example, between angles of 0° and 10° with respect to the horizontal, in particular steplessly. This allows the screen wave unit 3 to be flexibly adapted to different material mixtures to be sorted. In the Fig. 2. The conveying levels E have an angle of 7° with respect to the horizontal, for example. By adjusting the inclination of the conveying levels E from a position such as in Fig. In the common conveying plane E shown in Figure 4, a distance arises between the conveying planes E of one spiral wave screen module 50 and the conveying plane E of the respective subsequent spiral wave screen module 50, in particular also a distance in the vertical direction, i.e. in the direction of gravity.

[0047] These are modifications of the ones in the Fig. The device shown in Figures 2 to 4 is possible in which the main frame 4 is not pivotable relative to the machine frame 5 and the spiral wave screen modules 50 are each pivotable relative to the main frame 4 by means of an actuator 53. The main frame 4 can then be fixedly mounted relative to the machine frame 5, i.e., not pivotable. Alternatively, modifications of the device shown in the Fig. The device shown in Figures 2 to 4 is possible in which the spiral wave screen modules 50 are not pivotable relative to the main frame 4, and the main frame 4 together with the spiral wave screen modules 50 are pivotable relative to the machine frame 5 by means of the actuator 6. The main frame 4 can then form the module frames 51, or the module frames 51 can be fixedly mounted relative to the main frame 4, i.e., not pivotable.

[0048] The spiral shafts 10, 20, 30, 40 exhibit – as can be seen, for example, from the Fig. As can be seen in Figures 5 to 8, each has a hub 12, 22, 32, 42 with its respective axis of rotation 11, 21, 31, 41 as its central axis. A helix 13, 23, 33, 43 extends radially from the hub 12, 22, 32, 42 and winds around the hub 12, 22, 32, 42 along the axis of rotation 11, 21, 31, 41. The helix 13, 23, 33, 43 can be made of a flat strip-like material welded onto the hub 12, 22, 32, 42. The spiral shafts can be configured as a screw conveyor. In the example shown, a single helix 13, 23, 33, 43 winds around its hub 12, 22, 32, 42 with several turns. Versions with more than one helix, such as two helixes, are also possible, which wind around the hub with several turns in the manner of a multi-start thread.

[0049] In the in the Fig. 5 and Fig. 6. Two configurations of the spiral shafts 10, 20, 30, 40 are used for the applications in the Fig. Figures 1 to 4 show embodiments of the spiral wave screen module 50. The first spiral wave 10 and the second spiral wave 20 are arranged side by side such that their helixes 13, 23 interlock. One helix of one helix 13, 23 engages, in particular, in a gap between two adjacent helixes of the other helix 13, 23. Similarly, the third spiral wave 30 and the fourth spiral wave 40 are arranged side by side such that their helixes 33, 43 interlock. One helix of one helix 33, 43 engages, in particular, in a gap between two adjacent helixes of the other helix 33, 43. The second spiral wave 20 and the third spiral wave 30 are arranged side by side such that their helixes 23, 33 do not interlock.A helix of one helix 23, 33 is arranged between the two adjacent helixes of the other helix 22, 33, but does not engage in the space between the two adjacent helixes. Accordingly, the center distance a. 12 between the first and second axes of rotation 11, 21 of the first and second spiral shaft 10, 20 and / or the center distance a 34 between the third and fourth axes of rotation 31, 41 of the third and fourth spiral shaft 30, 40 smaller than the center distance a 23 between the second and third axes of rotation 21, 31 of the second and third spiral shaft 20, 30. For example, the axis distances a 12 and a 34 be the same size. Because the axle spacing a 23 The sieve size between the second and third spiral shaft (20, 30) is larger than the sieve size between the first and second spiral shaft (10, 20) and / or between the third and fourth spiral shaft (30, 40).

[0050] Between the flank of one of the two adjacent helixes and a flank of the intervening helix facing that flank, a region is formed, called the sieve gap, the size of which determines the size of the third fraction III, i.e., what proportion of the material to be sorted falls downwards in the third direction. In the Fig. 5 and Fig. In the example shown in Figure 6, a sieve gap for the third fraction III is formed between the flank of one of the two adjacent helixes of helix 23 and a flank of the helix of helix 13 arranged between them, between the flank of one of the two adjacent helixes of helix 43 and a flank of the helix of helix 33 arranged between them, and between the flank of one of the two adjacent helixes of helix 33 and a flank of the helix of helix 23 arranged between them.Because the center-to-center distance between the second and third axes of rotation 21, 31 is greater than the center-to-center distance between the first and second axes of rotation 11, 21 and / or the third and fourth axes of rotation 31, 41, the sieve gap for the third fraction III between the second and third spiral shaft 20, 30 is larger than between the first and second spiral shaft 10, 20 and / or the third and fourth spiral shaft 30, 40. In the Fig. 5 and Fig. In the example shown, the sieve gaps formed between the first and second spiral wave 10, 20 for the third fraction III and the sieve gaps formed between the third and fourth spiral wave 30, 40 for the third fraction III are of the same size.

[0051] In the Fig. In the example shown in Figure 5, the spiral shafts 10, 20, 30, 40 are arranged such that the spiral thread located between two adjacent turns of one spiral shaft 10, 20, 30, 40 is located centrally or approximately centrally between the two adjacent turns of the adjacent spiral shaft 10, 20, 30, 40. For example, the spiral thread of the first spiral shaft 10, located between two adjacent turns of the second spiral shaft 20, is located centrally or approximately centrally between the two adjacent turns. The spiral thread of the third spiral shaft 30, located between two adjacent turns of the fourth spiral shaft 40, is located centrally or approximately centrally between the two adjacent turns. The spiral thread of the second spiral shaft 20, located between two adjacent turns of the third spiral shaft 30, is located centrally or approximately centrally between the two adjacent turns.

[0052] In the Fig. In the example shown in Figure 6, the spiral shafts 10, 20, 30, 40 are arranged such that the spiral turn located between two adjacent turns of one spiral shaft 10, 20, 30, 40 is arranged off-center or offset from one of the two adjacent turns of the adjacent spiral shaft 10, 20, 30, 40. For example, the spiral turn of the first spiral shaft 10, located between two adjacent turns of the second spiral shaft 20, is arranged off-center between the two adjacent turns. The spiral turn of the third spiral shaft 30, located between two adjacent turns of the fourth spiral shaft 40, is arranged off-center between the two adjacent turns. The spiral turn of the second spiral shaft 20, located between two adjacent turns of the third spiral shaft 30, is arranged off-center between the two adjacent turns. This results in a configuration that differs from the configuration shown in Figure 6. Fig. 5 enlarged sieve gap for the third fraction III. The spiral shafts 10, 20, 30, 40 and their center distances can be found in the configurations from the Fig. 5 and Fig. The 6 components are identical, with only the arrangement of the spiral shafts 10, 20, 30, 40 differing from each other. This allows the sieve gap for the third fraction III to be adjusted without having to produce different spiral shafts 10, 20, 30, 40.

[0053] The arrangement of the spiral shafts 10, 20, 30, 40 relative to each other for adjusting the screen gap for the third fraction III can be carried out, for example, during the assembly of the spiral shaft screen device 1. If the screen gap for the third fraction III is to be changed, the spiral shaft screen device 1 can be adjusted, for example, from the configuration shown. Fig. 5 into the configuration Fig. 6 or vice versa, can be manually converted, whereby the rotation angles of the spiral shafts 10, 20, 30, 40 to each other are changed to adjust the sieve gap for the third fraction III.

[0054] In advantageous embodiments, at least one adjusting device, such as a rotary angle adjusting device, can be provided for each spiral shaft screen module 50, which is arranged, for example, in the gearbox of the spiral shaft screen module 50, and which is configured to adjust the rotary angles of the spiral shafts 10, 20, 30, 40 relative to each other, for example, from the configuration Fig. 5 into the configuration Fig. 6 or vice versa, without having to dismantle or modify the spiral shaft screen device 1. The adjustment of the rotation angles of the spiral shafts 10, 20, 30, 40 relative to each other can be carried out at standstill or during operation, i.e., during the rotation of the spiral shafts 10, 20, 30, 40. For example, a control unit can be provided which causes the adjustment device to change the rotation angles between the spiral shafts 10, 20, 30, 40. In particular, a value for the particle size of the third fraction can be specified to the control unit, whereby the control unit causes the adjustment device to set the rotation angles between the spiral shafts 10, 20, 30, 40 accordingly.For example, the control system can include a memory in which a rotation angle ratio between the spiral shafts 10, 20, 30, 40 is assigned to specific particle sizes for the third fraction III, wherein the control system is configured to select the appropriate rotation angle ratio between the spiral shafts based on an input of a desired particle size for the third fraction III, for example by a user, and to cause the adjustment device to set this rotation angle ratio between the spiral shafts.

[0055] In the Fig. 7 and Fig. Figure 8 shows a modification in which the spiral wave screen module 50 has at least three spiral waves 10, 20, 30 or optionally four spiral waves 10, 20, 30, 40 (see Figure 8). Fig. 7, in which a small part of the helix 43 is shown).

[0056] In contrast to the statements from the Fig. 5 and Fig. 6. The execution process is based on the following: Fig. 7 and Fig. 8 not only the first and second spiral shafts 10, 20 and optionally the third and fourth spiral shafts 30, 40, but also the second and third spiral shafts 20, 30 interlock. A turn of one helix 23, 33 engages, in particular in a gap, between two adjacent turns of the other helix 23, 33. The second spiral shaft 20 and the third spiral shaft 30 are arranged side by side such that their turns 23, 33 interlock. The center distance a 12The distance between the first and second axes of rotation 11, 21 of the first and second spiral shaft 10, 20, the center distance between the third and fourth axes of rotation 31, 41 of the optional third and fourth spiral shaft 30, 40, and the center distance between the second and third axes of rotation 21, 31 of the second and third spiral shaft 20, 30 are equal. Therefore, the screen opening between the second and third spiral shaft 20, 30 is equal to the screen opening between the first and second spiral shaft 10, 20 and / or between the third and fourth spiral shaft 30, 40.

[0057] In the Fig. In the example shown in Figure 7, the spiral shafts 10, 20, 30, 40 are arranged such that the spiral thread located between two adjacent turns of one spiral shaft 10, 20, 30, 40 is located centrally or approximately centrally between the two adjacent turns of the adjacent spiral shaft 10, 20, 30, 40. For example, the spiral thread of the first spiral shaft 10, located between two adjacent turns of the second spiral shaft 20, is located centrally or approximately centrally between the two adjacent turns. The spiral thread of the third spiral shaft 30, located between two adjacent turns of the fourth spiral shaft 40, is located centrally or approximately centrally between the two adjacent turns. The spiral thread of the second spiral shaft 20, located between two adjacent turns of the third spiral shaft 30, is located centrally or approximately centrally between the two adjacent turns.

[0058] In the Fig. In the example shown in Figure 8, the spiral shafts 10, 20, 30, 40 are arranged such that the spiral thread located between two adjacent turns of one spiral shaft 10, 20, 30, 40 is arranged off-center or offset from one of the two adjacent turns of the adjacent spiral shaft 10, 20, 30, 40. For example, the spiral thread of the first spiral shaft 10, located between two adjacent turns of the second spiral shaft 20, is arranged off-center between the two adjacent turns. The spiral thread of the third spiral shaft 30, located between two adjacent turns of the fourth spiral shaft 40, is arranged off-center between the two adjacent turns. The spiral thread of the second spiral shaft 20, located between two adjacent turns of the third spiral shaft 30, is arranged off-center between the two adjacent turns. This results in a configuration that differs from the configuration shown in Figure 8. Fig. 7 enlarged sieve gap for the third fraction III. The spiral shafts 10, 20, 30, 40 and their center distances can be found in the configurations from the Fig. 7 and Fig. The 8 components are identical, with only the arrangement of the spiral shafts 10, 20, 30, 40 differing from each other. This allows the sieve gap for the third fraction III to be adjusted without having to produce different spiral shafts 10, 20, 30, 40.

[0059] The arrangement of the spiral shafts 10, 20, 30, 40 relative to each other for adjusting the sieve gap for the third fraction III can be, as in the design from the Fig. 5 and Fig. 6, for example during the assembly of the spiral shaft screen device, by manual conversion or by means of at least one adjustment device provided for each spiral shaft screen module 50, such as a rotary angle adjustment device. Reference symbol list 1 spiral wave sieve device 2 Feeding device / Conveyor belt 3 sieve shaft unit 4 main frames 5 machine frame 6 Actuator 7 engine 8 Conveyor belt 10 first spiral shaft 11 first axis of rotation 12 hub 13 Wendel 20 second spiral shaft 21 second axis of rotation 22 hub 23 Wendel 30 third spiral shaft 31 third axis of rotation 32 hub 33 Wendel 40 fourth spiral shaft 41 fourth axis of rotation 42 hub 43 Wendel 50 spiral shaft sieve module 51 module frames 52 Engine-gearbox unit 53 Actuator a 12 axle spacing a 23 axle spacing a 34 axle spacing S swivel axis S 50 Swivel axis s 23 gap D2 Outer diameter of the helix d2 Outer diameter of the hub P Slope of the helix First faction II second faction III third faction E funding level x first direction of flow y second direction of conveyance third funding direction QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] EP 1 570 919 B1 [0002, 0006] US 10 406 560 B1

[0003]

Claims

[1] Spiral wave sieve device (1) comprising the following: several spiral wave screen modules (50), each comprising several rotatable spiral shafts (10, 20, 30, 40) whose axes of rotation (11, 21, 31, 41) are arranged parallel to each other and form a conveying plane (E), wherein the spiral wave screen modules (50) are configured to separate a material mixture into at least a first fraction (I), a second fraction (II) and a third fraction (III) and to transport the first fraction (I) along the conveying plane (E) in a first conveying direction (x) transverse to the axes of rotation (11, 21, 31, 41) and the second fraction (II) along the conveying plane (E) in a second conveying direction (y) along the axes of rotation (11, 21, 31, 41), wherein screen gaps are formed between the spiral waves (10, 20, 30, 40) through which the third fraction (III) is discharged in a third conveying direction (z), in particular the direction of gravity, transverse to the conveying plane (E), wherein the spiral wave screen modules (50) are arranged successively in the first conveying direction (x) transverse to the axes of rotation (11, 21, 31, 41) and the conveying plane (E) of a spiral wave screen module (50) following in the first conveying direction (x) is arranged or movable in the direction of gravity offset downwards with respect to the conveying plane (E) of the preceding spiral wave screen module (50). [2] Spiral shaft sieve device (1) according to the preceding claim, wherein each spiral shaft sieve module (50) has a drive, for example an electric motor, with which the spiral shafts (10, 20, 30, 40) of the spiral shaft sieve module (50) can be driven, in particular via a gearbox, such as a chain or belt drive. [3] Spiral shaft screen device (1) according to one of the preceding claims, wherein a control is provided which is configured to control the rotational speed of the drives of the spiral shaft screen modules (50) separately and / or in such a way that the spiral shafts (10, 20, 30, 40) of a preceding spiral shaft screen module (50) have a different rotational speed than the spiral shafts (10, 20, 30, 40) of the subsequent spiral shaft screen module (50). [4] Spiral wave screen device (1) according to one of the preceding claims, wherein at least one actuating element (6, 53) is provided with which an inclination of the conveying planes (E) of the spiral wave screen modules (50) can be changed with respect to the horizontal, such as between 0° and 15° or between 0° and 10°. [5] Spiral wave sieve device (1) according to the preceding claim, wherein an actuating element (53) is provided for each spiral wave sieve module (50). [6] Spiral wave sieve device (1) according to the preceding claim, wherein the spiral wave sieve modules (50) can be moved by means of the actuators (53) into a position in which the conveying planes (E) of the spiral wave sieve modules (50) form a common conveying plane (E). [7] Spiral wave screen device (1) according to claim 5 or 6, wherein each spiral wave screen module (50) is mounted via a pivot bearing which has a pivot axis (S 50 ) is connected to a main frame (4) about which it can be pivoted by means of its actuator (53) to change the inclination of the conveying plane (E) with respect to the horizontal. [8] Spiral wave screen device (1) according to one of the preceding claims, wherein the spiral wave screen modules (50) are arranged on a main frame (4) and the main frame (4) is adjustable by means of the actuating element (6) to jointly change the inclination of the conveying planes (E) of the spiral wave screen modules (50) with respect to the horizontal. [9] Spiral wave screen device (1) according to claim 4 or 8, wherein the offset between the conveying planes (E) between the subsequent and preceding spiral wave screen modules (50) remains constant during adjustment. [10] Spiral wave sieve device (1) according to claim 4, 8 or 9, wherein the main frame (4) is pivotable about a pivot axis (S) by means of the actuating element (6), which is arranged by a pivot bearing, in particular between the main frame (4) and a machine frame (5). [11] Spiral wave screen device (1) according to one of the preceding claims, wherein at least one of the spiral wave screen modules (50) has at least two spiral shafts (10, 20, 30, 40) which are coupled to the drive in such a way that they can be driven at the same speed, wherein an adjustment device is provided with which a relative angular position between these spiral shafts (10, 20, 30, 40) can be adjusted. [12] Spiral wave screen device (1) according to one of the preceding claims, wherein at least one of the spiral wave screen modules (50) has at least one first, second, third and fourth spiral wave (10, 20, 30, 40) in the conveying direction (x), wherein the spiral waves (10, 20, 30, 40) each have a helix (13, 23, 33, 43) extending radially from a hub (12, 22, 32, 42) which winds around and along the axis of rotation (11, 21, 31, 41), wherein a space is formed between adjacent helix turns, wherein the helixes (13, 23) of the first and second spiral wave (10, 20) engage each other in their spaces and the helixes of the third and fourth spiral wave (30, 40) engage each other in their spaces. [13] Spiral shaft sieve device (1) according to claim 12, wherein at least one adjustment device is provided with which a relative angular position between the first and second spiral shaft (10, 20) and / or the third and fourth spiral shaft (30, 40) and / or between the second and third spiral shaft (20, 30) can be adjusted. [14] Spiral wave sieve device (1) according to claim 12 or 13, wherein the second and third spiral shafts (20, 30), whose axes of rotation (21, 31) are parallel to each other, are spaced apart from each other so that their helixes (23, 33) do not engage each other in their spaces. [15] Spiral wave sieve device (1) according to claim 12 or 13, wherein the helixes (23, 33) of the second and third spiral shaft (20, 30), whose axes of rotation (21, 31) are parallel to each other, engage in their intersecting spaces. [16] Spiral shaft sieve device (1) according to one of the preceding claims, wherein the spiral shafts (10, 20, 30, 40) are cantilevered and have a free end. [17] Spiral wave sieve device (1) according to one of the preceding claims, further comprising a feed device (2) for the material to be sorted, wherein one end of the feed device (2) is arranged such that the material to be sorted can be discharged from the feed device (2) onto one of the spiral wave sieve modules (50). [18] Spiral wave sieve device (1) according to one of the preceding claims, further comprising at least one discharge device for at least one of the fractions (I, II, III) of the sorted material. [19] Spiral wave screen device (1) according to one of the preceding claims, wherein a spiral wave screen module (50) has at least two or exactly two spiral waves (10, 20) or exactly four spiral waves (10, 20, 30, 40).

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