• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A method is provided for the separation of bulk material (2) containing earth material (21) and stone material (22) by means of an excavation screen (1). The method comprises the steps of feeding the bulk material (2) into a cylindrical drum screen (40) through a feed opening (43) of the drum screen (40); Comminution of the earth material (21) and optionally detachment of the earth material (21) from the stone material (22) by means of helically arranged sharp-edged structures (45a, 45b), in particular thorns or teeth, on the inner wall of the rotating drum screen (40); dry sieving of the comminuted earth material (21) from the drum screen (40); Conveying the stone material (22) from the feed opening (43) to a discharge opening (44) of the drum screen (40); and discharge of the stone material (22) separated from the earth material (21) and optionally separate discharge of the earth material (21) that has been screened out.
    公开号:CH716128A1
    申请号:CH00382/20
    申请日:2020-03-31
    公开日:2020-10-30
    发明作者:Diggelmann Walter
    申请人:Kibag Man Ag；
    IPC主号:
    专利说明:

    Technical area
    The present invention is in the field of construction. In particular, the invention relates to a method for separating bulk material, as well as an excavation screening system for carrying out such a method.
    State of the art
    Stone material, especially unbound mixture or gravel, is an important and versatile raw material used in construction, for example as an aggregate for concretes, as bulk material or as a base layer in road construction. When excavating a construction pit, the so-called bulk material is often stored in excavation dumps and / or transported to a local gravel washing plant in order to separate the excavated earth from the stone material. Known gravel washing systems have the disadvantage that after a first sorting out of coarse stones, the stone material has to be washed with water in a wet process in order to free the stone material from unwanted components such as wooden parts, clay and loam. The wet process is problematic as it is relatively expensive due to the large amount of water required and also pollutes the environment. Often the wet method only achieves poor results when excavating, since the proportion of loamy earth material that is firmly adhering to the stone material in the bulk material is relatively high and can only be separated from the stone material with great effort.
    For this reason, dryer screen systems are sometimes used in which the bulk material can be separated anhydrous. The approach here is to mechanically separate the earth material from the stone material. A conventional sieving process is only suitable to a limited extent, as the bulk material often contains a relatively high proportion of hardened clumps of clay which, due to their size and strength, cannot be separated from the stone material by means of a sieving process.
    In order to take account of this fact, excavation screens were developed in which the bulk material is applied to rotating spiral rollers. Such a system is disclosed in EP 1 570 919 A1 or EP 2 914 386, for example. The interlocking spiral rollers grind the clumps of earth into relatively fine earth material, which falls through gaps between the individual rollers and is thus separated from the stone material. The disadvantage here, however, is that a relatively large proportion of stone material with a small grain size falls through between the crevices and thus cannot be separated from the earth material. This reduces the overall yield of the stone material. In addition, with very loamy bulk material, several passes are often necessary in order to be able to completely separate the stone material from the earth material.
    Presentation of the invention
    While the excavation sieve systems known in the prior art provide satisfactory results for bulk material with a low proportion of clay and in particular can effectively separate hardened clay lumps from the stone material, the separation of bulk material with a high proportion of clay and / or sticky clay is problematic. It was observed here that earth material that adheres to the stone material cannot be easily separated from it by common mechanical means, such as spiral rollers. Without such a separation, however, only poor quality stone material is obtained, which cannot be used in construction. For example, it is necessary to carry out several sieves with the same material. However, since this is associated with an increased expenditure of time, only specifically selected bulk material, which has a low proportion of clay, can often be used for the preparation of stone material. Due to the availability of resources, the processing of bulk material was not economically viable in the past. This process only became interesting because of today's shortage of materials and space.
    It is therefore the general object of the invention to further develop the prior art in the field of excavation screening systems and the method for separating bulk material and preferably to overcome one or more disadvantages in the prior art.
    In some preferred embodiments of the invention, a method for separating bulk material is provided which can efficiently separate even bulk material with a high clay content and / or earth material adhering to the stone material of the bulk material.
    In some embodiments, a method for separating bulk material is provided which completely separates hardened clumps of the earth material from the stone material.
    In preferred embodiments, a method for separating bulk material is provided, which can be carried out cost-effectively.
    In addition, an excavation screen is provided for carrying out the embodiments of the method according to the invention described here.
    A first aspect of the invention relates to a method for the separation of bulk material comprising earth material and stone material. The process comprises the following steps:Feeding the bulk material into a substantially cylindrical drum screen through a feed opening of the drum screen;Comminution of the earth material and optionally detachment of the earth material from the stone material by means of helically arranged sharp-edged structures, in particular thorns or teeth, on the inner wall of the rotating drum screen;dry sieving of the crushed earth material from the drum screen;Conveying the stone material from the feed opening to a discharge opening of the drum screen; andRemoval of the stone material separated from the earth material.
    The person skilled in the art understands that the term “dry sieving” in the context of the invention is to be understood in such a way that no additional water is added or used. The bulk material can, however, still contain earth-moist earth materials, which do not have to be dried first in order to separate them from the stone material. In addition, the list of process steps should not be understood as a strict sequence of the individual steps. The removal of the stone material separated from the earth material merely describes that the stone material is conveyed out of the drum screen through the discharge opening and thus does not necessarily require the presence of an additional discharge device, e.g. a conveyor belt, ahead.
    In addition, it is clear to the person skilled in the art that the term “cylindrical drum screen” also includes tubular bodies with edges. In particular, a cylindrical drum screen can have a polygonal, for example a four-, five-, six-, seven- or octagonal cross-section.
    Furthermore, helically arranged sharp-edged structures denote structures which are arranged in such a way that they describe a helix within the drum screen. The coil can be physically present, for example as an exchangeable belt. However, it is also possible that the sharp-edged structures are present individually and are only arranged on an imaginary helical line within the drum screen. For example, it is possible for the sharp-edged structures to be connected directly to the drum screen, for example by welding, screwing or riveting. Sharp-edged structures in the sense of the present invention are able to crush earth material. For example, knives, teeth, thorns or similar structures can be used as sharp-edged structures. The sharp-edged structures preferably include knives and / or teeth. In preferred embodiments, the sharp-edged structures can consist of a hardened metal or a hardened ceramic, in particular hardened steel.
    The combination of the helically arranged sharp-edged structures and the drum screen has proven to be particularly advantageous, since both the sharp-edged structures and the stone material thrown and thrown up by the rotation of the drum screen crushed hardened clumps of the earth material. The sharp-edged structures act on the one hand as a conveying device and on the other hand as a cutter, which crushes the earth material. Furthermore, hardened clumps of the earth material can be impaled through the sharp-edged structures. The stone material thrown through the rotating drum screen can break up such impaled clumps and thus loosen them again from the sharp-edged structures. In addition, the sharp-edged structures detach soil material adhering to the stone material, especially when the soil material is still moist. Furthermore, the helical arrangement simultaneously serves to convey the stone material within the drum screen, which continuously transports the stone material remaining in the drum screen from the supply opening to the discharge opening. The stone material emerging through the discharge opening typically only has a residual soil content of 0 to 5% after a single passage.
    The method steps for separating the bulk material are preferably carried out at the site of the excavation. This means that the bulk goods do not have to be transported or temporarily stored. The excavation screen is therefore preferably designed as a mobile excavation screen.
    In preferred embodiments, the bulk material can be pre-sorted before being fed into the drum screen, with coarse stone material with a grain size of more than 300 mm being sorted out. These therefore do not get into the drum screen.
    In some embodiments, the duration of the stone material for 1 m 3 bulk material through the drum screen is 40 to 60 seconds. The cycle time can be set here, for example, by the speed of rotation of the drum screen, the inclination or the arrangement of the sharp-edged structures.
    In some embodiments, 3 m 3 bulk material can be separated per minute.
    In further embodiments, the bulk material is fed to the drum screen in the undried state. This has the advantage that an additional, time-consuming drying step can be dispensed with. By means of the method according to the invention, it is easily possible to detach and separate even moist earth material which adheres relatively strongly to the stone material directly from the stone material.
    In some embodiments, the drum screen rotates at a speed of 1 to 5 m / s, preferably 2 to 3 m / s. Such a rotational speed is high enough that enough energy is provided to grind or comminute hardened clumps of the earth material. At the same time, however, the speed of rotation is low enough that the stone material is thrown within the drum screen and is not only arranged on the inner wall of the drum screen due to the centrifugal force during the separation.
    In further embodiments, a part of the earth material adhering to the sharp-edged structures is detached from the sharp-edged structures by means of an inner brush arranged within the drum screen. The inner brush can also be arranged to be movable, in particular rotatable. The use of such a brush is particularly advantageous when separating earth-moist bulk material in order to prevent the sharp-edged structures from sticking together. However, it was found that the stone material in the bulk material, which is thrown by the rotation of the drum screen, leads to the sharp-edged structures being cleaned.
    [0023] The inner brush preferably extends along the entire length of the drum screen. Furthermore, it can be advantageous if the inner bust is arranged in the upper region of the drum screen. Optionally, the soil resulting from the brushing can be collected and transported away directly by means of a conveying device arranged at least partially within the drum screen.
    In some embodiments, the drum screen is inclined prior to the feeding of the bulk material such that the discharge opening is arranged offset vertically upwards relative to the feed opening. The inclination can be 0 to 5 °, preferably 1 to 2 °. This ensures that the bulk material is only conveyed by the helical arrangement of the sharp-edged structures and not by gravity. Thus, the bulk material remains inside the drum screen long enough so that the stone material can essentially be completely separated from the earth material. As a result, better results were achieved in comparison to a planar arrangement or an arrangement with a discharge opening that is lowered relative to the feed opening.
    In further embodiments, an outer brush rests on the outer wall of the rotating drum screen, the outer brush brushing off soil material adhering to the drum screen or at least partially clogging the drum screen. The external brush itself is typically rotatable.
    In some embodiments, the excavation screening system additionally has a nozzle device with one or more air pressure nozzles. The nozzle device steams up the screen openings of the drum screen with compressed air. The pressurized air is preferably applied before, after and / or during the sieving out of the comminuted earth material. In this way it is avoided that soil material clogs the sieve openings of the drum sieve, or soil material that blocks the sieve openings is removed from the sieve.
    The screen openings of the cylindrical drum screen are the openings in the cylinder jacket which define the mesh size of the drum screen and not the significantly larger feed and / or discharge opening.
    The application of compressed air to the sieve openings has proven to be particularly advantageous, since very moist soil material, such as is often present, for example, in spring or autumn, can be efficiently removed from the sieve openings. Particularly when removing relatively moist soil, a nozzle device has proven to be significantly more advantageous than other devices for removing soil, such as e.g. To brush. The nozzle device is preferably arranged outside the drum screen so that the compressed air is directed towards the central axis of the cylindrical drum screen. In some embodiments, the one or more air pressure nozzles are aligned with the screen openings of the drum screen. Typically, the nozzle device can comprise a compressor for providing the compressed air.
    In further embodiments, the nozzle device has a plurality of air pressure nozzles arranged one behind the other in the conveying direction and the air pressure nozzles are acted upon sequentially one after the other in the conveying direction or against the conveying direction with compressed air in such a way that only a single air pressure nozzle is acted upon with compressed air at any point in time. Typically, compressed air is applied to the air pressure nozzles sequentially one after the other in the conveying direction or against the conveying direction in such a way that after the air pressure nozzle has been applied to a first air pressure nozzle, the air pressure nozzle directly adjacent in or against the conveying direction is immediately charged with compressed air. The sequential application of compressed air can significantly reduce the energy consumption of the nozzle device.
    [0030] The method according to the invention can preferably be carried out with an excavation screen in accordance with one of the embodiments described here.
    Another aspect of the invention relates to an excavation screen for separating bulk material comprising earth and stone material, in particular for carrying out the method according to the invention according to one of the embodiments described here. The excavation screening system comprises a feed device for feeding bulk material, which contains at least earth material and stone material. In addition, the excavation screen has an essentially cylindrical drum screen with an inner wall and an outer wall. The drum screen comprises a feed opening, a discharge opening, as well as sharp-edged structures, in particular spikes and / or teeth, arranged in a helical manner on the inner wall of the drum screen. The sharp-edged structures serve to crush and separate soil material.
    [0032] The excavation sieve system can preferably have a discharge device for discharging the stone material and optionally also the earth material. A conveyor belt, for example, can be used as the feed and / or discharge device. However, manual supply or removal is also possible, for example by means of shovels or excavators. The feed device and / or the discharge device preferably comprises a receiving funnel or a sliding plate.
    In preferred embodiments, the drum screen and / or the sharp-edged structures are made of metal, preferably steel.
    [0034] The sharp-edged structures can preferably be detachably connected to the drum screen. For example, the sharp-edged structures can be attached to a helical belt, e.g. made of metal, which can be detachably attached to the inner wall of the drum screen. It is also possible to releasably connect the sharp-edged structures to the drum screen by means of snap-in connections or screw connections.
    [0035] The sharp-edged structures are preferably structures that are formed separately from one another.
    In further embodiments, the sharp-edged structures can have a triangular contour and / or be designed in the shape of a shovel. The sharp-edged structures can also have a curvature.
    In some embodiments, the excavation screen has a sorting device for pre-sorting the bulk material before it is fed to the drum screen. The sorting device is arranged in front of the feed opening of the drum screen in the conveying direction. For example, the sorting device can have a coarse-meshed grid or several struts, which stone material with a predetermined minimum grain size, e.g. of more than 300 mm, can sort out.
    In some embodiments, the sharp-edged structures have an angle of 0 to 45 °, preferably 20 to 35 °, to a cross-sectional plane through the cylindrical drum screen. The cross-sectional plane is arranged at right angles to the inner wall of the drum screen and parallel to the discharge opening. The arrangement of the sharp-edged structures with such an angle leads to a more efficient conveyance of the bulk material within the drum screen in the direction of the discharge opening.
    In some embodiments, the excavation screen also has an outer brush resting against the outer wall of the drum screen to prevent clogging and soil material from sticking to the drum screen.
    In some embodiments, the excavation screening system additionally has a nozzle device with one or more air pressure nozzles. The nozzle device is designed to fog the screen openings of the drum screen with compressed air. This ensures that soil material which clogs the sieve openings of the drum sieve is removed from the sieve openings. The screen openings of the cylindrical drum screen are the openings in the cylinder jacket which define the mesh size of the drum screen and not the significantly larger feed and / or discharge opening. The application of compressed air to the sieve openings has proven to be particularly advantageous, since very moist soil, as is often the case in spring or autumn, can be efficiently removed from the sieve openings. Especially when removing relatively moist soil that clogs the sieve openings, a nozzle device has proven to be significantly more advantageous than other devices for removing soil, such as e.g. To brush. The nozzle device is preferably arranged outside the drum screen, so that the compressed air is directed towards the central axis of the cylindrical drum screen and the removed soil can be blown back into the interior of the drum and screened out downstream. In some embodiments, the one or more air pressure nozzles are aligned with the screen openings of the drum screen. Preferably, the nozzle device extends along the entire length of the drum screen. Furthermore, the nozzle device is designed in such a way that compressed air can be applied to essentially all of the screen openings. Typically, the nozzle device can comprise a compressor for providing the compressed air.
    In further embodiments, the nozzle device has several air pressure nozzles arranged one behind the other in the conveying direction and a control unit. The control unit is designed to apply compressed air to the air pressure nozzles sequentially one after the other in the conveying direction or against the conveying direction in such a way that only a single air pressure nozzle is acted upon or can be acted upon with compressed air at any one time. Typically, the control unit is designed to apply compressed air to the air pressure nozzles sequentially one after the other in the conveying direction or against the conveying direction in such a way that, after the application of compressed air to a first air pressure nozzle, the air pressure nozzle directly adjacent in or opposite to the conveying direction is directly acted upon with compressed air or can be acted upon. The sequential application of compressed air can significantly reduce the energy consumption of the nozzle device.
    In further embodiments, the sharp-edged structures have a tilt angle of 70 ° to 130 °, preferably 80 to 110 °, to the inner wall of the drum screen in the direction of the discharge opening of the drum screen. As a result, on the one hand, the bulk material is conveyed more efficiently from the feed opening in the direction of the discharge opening and, on the other hand, the separation of soil material adhering to the stone material and the comminution of hardened clumps of the soil material are improved.
    In some embodiments, the helically arranged sharp-edged structures form a helix with a pitch of 150 mm to 400 mm, preferably 200 mm to 300 mm. This avoids that the bulk material merely jumps onto the sharp-edged structures, which would worsen the separation and sifting out of the earth material.
    In further embodiments, the sharp-edged structures are divided into a first group and a second group. The sharp-edged structures of the first group are larger than the sharp-edged structures of the second group. The sharp-edged structures of the first group and the sharp-edged structures of the second group are preferably each arranged helically. For example, the first group can form a first helix and the second group can form a second helix. The two coils are preferably congruent to one another and thus offset to one another by a certain proportion of the pitch. The smaller sharp-edged structures enable an improved comminution of the earth-like material, but have a significantly smaller share in the conveyance of the bulk material compared to the larger sharp-edged structures. The sharp-edged structures of the second group preferably have a maximum of 1/3 the size of the sharp-edged structures of the first group.
    In further embodiments, the drum screen has a mesh size of a maximum of 30 mm, preferably 15 mm to 30 mm. In contrast to the systems with spiral rollers known in the prior art, the yield of stone material is increased, since sieving with such a mesh size is technically not easily possible in these systems.
    In some embodiments, the length of the drum screen can have a length of 1 m to 8 m, preferably 3 m to 6 m. The person skilled in the art understands that the length of the drum screen corresponds in the geometric sense to the cylinder height.
    In further embodiments, the cylindrical drum screen has a diameter of 0.5 m to 4 m, preferably 1 to 3 m.
    In preferred embodiments, the length of the drum screen corresponds to at least three times the diameter of the drum screen.
    In some embodiments, the excavation screening system has a conveying device for conveying earth material, which is arranged at least partially within the drum screen. Such a conveying device can typically be arranged in an upper region of the drum screen and serve for the additional removal of separated earth material.
    In further embodiments, the excavation screen has an inner brush arranged within the drum screen. The inner brush is arranged in such a way that it comes into contact with the sharp-edged structures and can thereby free them from adhering earth material.
    In some embodiments, the excavation screening system comprises a drive motor for rotating the drum screen. In addition, the inner and / or the outer brush can optionally also be driven with this or another drive motor. Instead of a drive motor, the excavation screening system can also have a manual drive, e.g. a hand crank.
    In further embodiments, the excavation screening system comprises a lifting device for selectively raising or lowering the feed opening relative to the discharge opening. A hydraulic lifting device is preferably used here.
    In some embodiments, the removal device comprises a first conveyor system for removing the stone material and a second conveyor system for removing the earth material. Typically, the discharge and / or feed device can be a conveyor belt. The person skilled in the art understands that the second conveyor system is preferably arranged below the drum screen and extends along the entire length of the drum screen. The first conveying device can be arranged in such a way that the stone material can be picked up and transported away directly on the discharge device.
    Brief explanation of the figures
    [0054]<tb> <SEP> FIG. 1 shows a schematic side view of an excavation screen according to an embodiment of the invention;<tb> <SEP> FIG. 2 shows a schematic side view of an excavation screening installation according to a further embodiment of the invention;<tb> <SEP> FIG. 3 shows a schematic plan view of the discharge opening of an excavation screen according to a further embodiment of the invention;<tb> <SEP> FIG. 4 shows a schematic side view of an excavation screening system according to a further embodiment of the invention;<tb> <SEP> FIG. 5 shows a schematic side view of an excavation screening system according to a further embodiment of the invention.
    Ways of Carrying Out the Invention
    FIG. 1 shows an excavation screen 1 for separating bulk material 2, which contains at least soil material 21 and stone material 22. The excavation screen 1 comprises a feed device 30 which, in the embodiment shown, is designed as a conveyor belt. Furthermore, the excavation screen system 1 comprises a drum screen 40 with a feed opening 43 and a discharge opening 44, as well as an inner wall and an outer wall 42. For a better overview, only part of the drum screen is shown as a screen structure in FIG. The person skilled in the art understands that the screen structure extends essentially over the entire jacket surface of the cylindrical drum screen 40 and that this thus forms the inner and outer walls. The inner wall of the drum screen 40 has helically arranged sharp-edged structures 45a and 45b which are attached to a helical belt 45. The feed device 30 continuously delivers bulk material 2, which is fed to the drum screen 40 through the feed opening 43. The drum screen 40 rotating by the drive 50 separates the earth material 21 from the stone material 22 and sifts it out. A discharge device comprising a first conveyor system 51 for removing the stone material 22 and a second conveyor system 52 for removing the separated earth material 21 conveys the stone material and the earth material to separate destinations. Within the drum screen 40, the sharp-edged structures 45a and 45b act on the one hand as a conveying device for the bulk material in the direction of the discharge opening 44 and, on the other hand, as a milling cutter for comminuting the soil material 21.
    FIG. 2 shows an excavation screen 1 with a feed device 30 which, in the embodiment shown, is designed as a funnel. The bulk material 2 is introduced into the drum screen through the feed opening 43 of a cylindrical drum screen 40 by means of the funnel. The drum screen 40 has helically arranged sharp-edged structures 45a and 45b directly attached to the inner wall 41. In the present case, the sharp-edged structures are designed as knives. An outer brush 47 rests on the outer wall 42 of the drum screen and prevents the drum screen from clogging with soil. As shown in FIG. 2, the discharge opening 44 is increased relative to the supply opening 43 by an angle of inclination α. The inclination can be, for example, 0 to 5 °. In this way, the earth material 21 can be retained and screened out, while only the stone material 22 is conveyed to the discharge opening 44 by means of the sharp-edged structures. The relative increase in the discharge opening can be achieved by a hydraulic lifting device 48.
    In FIG. 3, a front view of an excavation sieve system 1 onto the discharge opening 44 is shown. The sharp-edged structures 45a and 45b are each arranged helically on the inner wall 41 of the drum screen 49. In the interior of the drum screen, an inner brush 46 is also provided, to which the drum screen is arranged to be relatively movable. The inner brush 46 is located in the upper area of the drum screen. When the drum screen 40 rotates, the inner brush 46 comes into contact with the sharp-edged structures and cleans them of adhering earth material. Below the inner brush, a conveying device arranged inside the drum can be provided for conveying or transporting away brushed earth material. For example, a conveyor belt can be attached underneath the inner brush, which catches the brushed off soil and transports it away.
    FIG. 4 shows a roughly schematic side view of a drum screen 40 as it can be used in some of the embodiments of the excavation screen system described here. The drum screen 40 shown has sharp-edged structures which are arranged helically on the inner wall and which can be designed as teeth. The sharp-edged structure 45a is arranged at an angle of β to the cross-sectional plane E through the cylindrical drum screen. The angle can be, for example, 0 to 45 °, in particular 30 °. The cross-sectional plane E is arranged at right angles to the inner wall 41 of the drum screen 40 and parallel to the discharge opening 44.
    FIG. 5 shows an excavation screen system 1, a drum screen 40 with screen openings 49 in a partially sectioned view, as well as a feed opening 43 and a discharge opening 44. The excavation screen system has a nozzle device 60 with a plurality of air pressure nozzles 61a (for reasons of clarity, only one is Nozzle 61a provided with a reference number), which are arranged to apply compressed air to the sieve openings 49 of the drum sieve 40. As shown, the nozzle device is arranged outside of the drum screen, so that the compressed air is directed towards the central axis of the cylindrical drum screen. The individual air pressure nozzles are aligned with the screen openings 49, are arranged as directly above the screen openings.
    List of reference symbols
    1 excavation screen 2 bulk material 21 earth material 22 stone material 30 feed device 40 drum screen 41 inner wall 42 outer wall 43 feed opening 44 discharge opening 45 helical belt 45a, 45b sharp-edged structures 46 inner brush 47 outer brush 48 lifting device 49 sieve openings 50 drive motor 51 first conveyor system 52 second conveyor system 60 nozzle device 61a Air pressure nozzle
    权利要求:
    Claims (21)
    [1]
    1. A method for the separation of bulk material comprising earth material and stone material by means of an excavation sieve, comprising the steps:- Feeding the bulk material into a cylindrical drum screen through a feed opening of the drum screen;- Comminution of the earth material and optionally detachment of the earth material from the stone material by means of helically arranged sharp-edged structures, in particular thorns or teeth, on the inner wall of the rotating drum screen;- dry sieving of the crushed earth material from the drum sieve;- Conveying the stone material from the feed opening to a discharge opening of the drum screen; and- Removal of the stone material separated from the earth material.
    [2]
    2. The method according to claim 1, characterized in that the passage time of the stone material for 1 m <3> bulk material through the drum screen is 40 to 60 seconds.
    [3]
    3. The method according to any one of the preceding claims, wherein the bulk material is fed to the drum screen in an undried state.
    [4]
    4. The method according to any one of the preceding claims, wherein the drum screen rotates at a speed of 1 to 5 m / s, preferably 2 to 3 m / s.
    [5]
    5. The method according to any one of the preceding claims, wherein a part of the soil adhering to the sharp-edged structures is detached from the sharp-edged structures by means of an inner brush arranged within the drum screen.
    [6]
    6. The method according to any one of the preceding claims, wherein the drum screen is inclined prior to feeding the bulk material in such a way that the discharge opening is arranged offset upwards relative to the feed opening.
    [7]
    7. The method according to any one of the preceding claims, wherein an outer brush rests against the outer wall of the rotating drum screen to avoid clogging of the drum screen and / or wherein the excavation screen system additionally has a nozzle device with one or more air pressure nozzles, the nozzle device applying compressed air to the screen openings of the drum screen .
    [8]
    8. The method according to claim 7, wherein the nozzle device has a plurality of air pressure nozzles arranged one behind the other in the conveying direction and the air pressure nozzles are acted upon sequentially one after the other in the conveying direction or against the conveying direction with compressed air in such a way that only a single air pressure nozzle is acted upon with compressed air at any point in time.
    [9]
    9. Excavation screen (1) for separating bulk material (2), comprising a feed device (30) for feeding bulk material (2) comprising earth material (21) and stone material (22) and a cylindrical drum screen (40) with an inner wall (41) and an outer wall (42), the drum screen (40) comprising:- A feed opening (43) and a discharge opening (44);- Sharp-edged structures (45a, 45b) arranged helically on the inner wall (41), in particular thorns or teeth, for comminuting and separating earth material (21).
    [10]
    10. excavation screen (1) according to claim 9, wherein the sharp-edged structures (45a, 45b) have an angle of 0 to 45 °, preferably 20 to 35 °, to a cross-sectional plane (E) through the cylindrical drum screen (40), wherein the Cross-sectional plane (E) is arranged at right angles to the inner wall (41) of the drum screen (40) and parallel to the discharge opening (44).
    [11]
    11. Excavation screen (1) according to one of claims 9 or 10, wherein the excavation screen (1) additionally has an outer brush (47) resting against the outer wall (42) of the drum screen (40) and / or wherein the excavation screen also has a nozzle device (60 ) with one or more air pressure nozzles (61a) and wherein the nozzle device (60) is designed to fog screen openings (49) of the drum screen (40) with compressed air.
    [12]
    12. Excavation screen (1) according to claim 11, wherein the nozzle device (60) has a plurality of air pressure nozzles (61a) arranged one behind the other in the conveying direction and a control unit and wherein the control unit is designed to sequentially sequentially successively in the conveying direction or opposite to the air pressure nozzles (61a) To apply compressed air to the conveying direction in such a way that only a single air pressure nozzle (61a) is subjected to compressed air at any point in time.
    [13]
    13. excavation screen (1) according to one of claims 9 to 12, wherein the sharp-edged structures (45a, 45b) to the inner wall (41) of the drum screen (40) in the direction of the discharge opening (44) of the drum screen (40) a tilt angle of 70 ° to 130 °, preferably 80 to 110 °.
    [14]
    14. excavation screen (1) according to one of claims 9 to 13, wherein the sharp-edged structures (45a, 45b) form a helix with a pitch of 150 mm to 400 mm, preferably 200 mm to 300 mm.
    [15]
    15. Excavation screen (1) according to one of claims 9 to 14, wherein the sharp-edged structures (45a, 45b) are divided into a first group and a second group, the sharp-edged structures (45a, 45b) of the first group being larger than that sharp-edged structures (45a, 45b) of the second group.
    [16]
    16. Excavation screen (1) according to one of claims 9 to 15, wherein the cylindrical drum screen (40) has a mesh size of a maximum of 30 mm, preferably 15 mm to 30 mm, and / or wherein the cylindrical drum screen (40) has a length of 1 m up to 8 m, preferably 3 m to 6 m, and / or wherein the cylindrical drum screen (40) has a diameter of 0.5 m to 4 m, preferably 1 to 3 m.
    [17]
    17. Excavation screen (1) according to one of claims 9 to 16, wherein the excavation screen (1) has a conveying device for conveying earth material which is at least partially within the drum screen (40).
    [18]
    18. Excavation screen (1) according to one of claims 9 to 17, wherein the excavation screen (1) has an inner brush (46) arranged within the drum screen (40).
    [19]
    19. Excavation screen (1) according to one of claims 9 to 18, additionally comprising a drive motor (50) for rotating the drum screen (40).
    [20]
    20. Excavation screen (1) according to one of claims 9 to 19, additionally comprising a lifting device (48) for selectively increasing or lowering the discharge opening (44) with respect to the supply opening (43).
    [21]
    21. Excavation screen (1) according to one of claims 9 to 20, wherein the discharge device comprises a first conveyor system (51) for removing the stone material and a second conveyor system (52) for removing earth material.
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    同族专利:
    公开号 | 公开日
    CH716116A2|2020-10-30|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE3720490A1|1987-06-20|1988-12-29|Kapuschinski Hannes J|Screen device|
    US5248042A|1991-06-18|1993-09-28|Ossi Rissanen|Resilient wire-wrapped, and adjustably tensioned screen drum with drum overload-preventing feedback control|
    WO2013128310A1|2012-02-16|2013-09-06|Ecocentro Tecnologie Ambientali S.P.A.|Rotary drum washer for street sweeping waste and contaminated|
    WO2013166821A1|2012-05-07|2013-11-14|西安交通大学|System for sorting and separating strip objects in municipal solid waste|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CH00555/19A|CH716116A2|2019-04-25|2019-04-25|Process for the separation of bulk material comprising earth material and stone material as well as excavation sieve for carrying out the process.|
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