Screening device

Abstract

A screening arrangement including two side walls, each having an inward facing side and an outward facing side, and a screen holder arrangement extending between the inward facing sides of the side walls for use in connecting a first and a second screening element. The screen holder arrangement includes a first screen connector and a second screen connector. The first screen connector includes a pivotable element arranged to pivot about an axis that is parallel with a longitudinal extension of the first screen connector. The pivotable element includes a connection portion arranged to hold one end of the first screening element. The pivotable element is arranged to pivot between a first position and a second position, where the pivotable element is arranged such that when it is in the second position and a screen is connected to the pivotable element, particles larger than a predetermined size are prevented from passing between the first and second screen connectors.

Claims

1. A screening arrangement including two side walls, each having an inward facing side and an outward facing side, and a screen holder arrangement extending between said inward facing sides of said two side walls for use in connecting a first and a second screening element, said screen holder arrangement comprising: a first screen connector and a second screen connector, wherein said first screen connector comprises a pivotable element arranged to pivot about an axis that is parallel with a longitudinal extension of said first screen connector, wherein said pivotable element comprises a connection portion arranged to hold one end of said first screening element, and said pivotable element is arranged to pivot between a first position and a second position, respectively, wherein said pivotable element is arranged such that when it is in said second position and said first screening element is connected to said pivotable element, particles larger than a predetermined size are prevented from passing between said first and second screen connectors, and wherein a seal is formed between said first and second screen connectors when said pivotable element is in said second position and said first screening element is connected to said pivotable element.

2. The screening arrangement according to claim 1, wherein said seal is formed by means of connection between said first screen connector, said second screen connector, and a portion of said first screening element.

3. The screening arrangement according to claim 1, wherein said first screen connector further comprises an actuator connected to said pivotable element, wherein said actuator is arranged to control the pivot of said pivotable element.

4. The screening arrangement according to claim 3, wherein said actuator comprises a handle arranged on said outward facing side of one of said two side walls, said handle being connected, through said side wall, to said pivotable element.

5. The screening arrangement according to claim 4, wherein said actuator further comprises a sealing element for sealing said inwards facing side of said side wall from said outwards facing side of said side wall.

6. The screening arrangement according to claim 1, wherein said pivotable element is arranged to pivot in an opening direction and a locking direction, between said first position and said second position, respectively.

7. The screening arrangement according to claim 6, wherein said pivotable element is arranged such that when in said second position and with said first screening element connected thereto, said pivotable element is biased against pivoting in said opening direction by tension from said first screening element.

8. The screening arrangement according to claim 1, wherein said second screen connector comprises a fixed beam having a connection portion arranged to hold one end of said second screening element.

9. The screening arrangement according to claim 1, wherein each one of said two side walls comprises a respective first guiding ledge for guiding said first screening element towards said connection portion of said pivotable element.

10. The screening arrangement according to claim 9, wherein said actuator further comprises a sealing element for sealing said inwards facing side of said side wall from said outwards facing side of said side wall, and wherein said first guiding ledge of at least one side wall extends above a portion of said side wall through which said handle is connected to said pivotable element.

11. The screening arrangement according to claim 9, wherein said pivotable element is arranged to pivot in an opening direction and a locking direction, between said first position and said second position, respectively, and wherein said first guiding ledge of at least one side wall extends above a portion of said side wall through which said handle is connected to said pivotable element.

12. The screening arrangement according to claim 1, wherein each one of said two side walls comprises a second guiding ledge for guiding said second screening element towards a connection portion of said second screen connector.

13. The screening device comprising a screening arrangement according to claim 1, and a first and a second screening element connected thereto.

14. A method for connecting a screening element to a screening arrangement, wherein said method comprises the steps of: providing a screening arrangement according to claim 1, providing a first screening element and a second screening element, said first and second screening elements each having a connection portion located at one end of said respective screening element, moving said pivotable element to said first position, inserting said first screening element into a position such that said connection portion of said first screening element is moved past said pivoting element, moving said pivotable element to said second position, withdrawing said first screening element such that said connection portion of said first screening element comes into contact with said connection portion of said pivotable element, thus connecting said first screening element to said first screen connector, connecting said connection portion of said second screening element to said second screen connector.

15. A mobile material processing plant comprising a screening arrangement according to claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The above, as well as additional objects, features and advantages of the present invention, will be better understood through the following illustrative and non-limiting detailed description of exemplary embodiments of the present invention, with reference to the appended drawing, wherein:

(2) FIG. 1 is a perspective view of a screening arrangement according to one exemplary embodiment of the present invention,

(3) FIG. 2 is a perspective view of the screening arrangement of FIG. 1, wherein a first and a second screening element have been connected thereto,

(4) FIG. 3A is a side view of the screen holder arrangement according to one exemplary embodiment of the present invention, wherein the pivotable element of the first screen connector is in the first position,

(5) FIG. 3B is a side view of the screen holder arrangement of FIG. 3A, wherein the pivotable element of the first screen connector is in the first position and a first screening element is inserted into the screen holder arrangement,

(6) FIG. 3C is a side view of the screen holder arrangement of FIG. 3A, wherein the pivotable element of the first screen connector is in the second position and a first screening element is connected thereto,

(7) FIG. 3D is a side view of the screen holder arrangement of FIG. 3A, wherein the pivotable element of the first screen connector is in the second position and a first screening element is connected thereto, and wherein a second screening element is connected to the second screen connector,

(8) FIG. 4 is a side view of a mobile crushing and screening plant.

DETAILED DESCRIPTION OF THE DRAWINGS

(9) In the present detailed description, embodiments of a screening arrangement according to the present invention are mainly discussed with reference to drawings showing a screening arrangement and/or a screening device with components and portions being relevant in relation to various embodiments of the invention. It should be noted that this by no means limits the scope of the invention, which is also applicable in other circumstances for instance with other types or variants of screening arrangements or screening devices than the embodiments shown in the appended drawings. Further, that specific features are mentioned in connection to an embodiment of the invention does not mean that those components cannot be used to an advantage together with other embodiments of the invention.

(10) The invention will now by way of example be described in more detail by means of embodiments and with reference to the accompanying drawings.

(11) FIG. 1 is a perspective view of a screening arrangement 1 according to one exemplary embodiment of the present invention. The screening arrangement 1 comprises two side walls 11, 12, each having an inward facing side 13 and an outward facing side 14. The screening arrangement 1 further comprises an inlet portion 15 for receiving a stream of material to be screened and an outlet portion 16 for discharging the material stream after it has passed the screening arrangement 1, wherein the inlet and the outlet portions 15, 16 are arranged at either end of the screening arrangement 1.

(12) These two side walls 11, 12 are connected to each other by means of a plurality of supporting beams 17 extending between the two side walls 11, 12 in a perpendicular direction thereto. The supporting beams 17 help keep the screening arrangement 1 stable when screening elements 91, 92 connected thereto vibrate.

(13) The screening arrangement 1 further comprises a screen holder arrangement 2 extending between said inward facing sides 13 of said two side walls 11, 12 for use in connecting a first and a second screening element 91, 92 thereto. The screen holder arrangement 2 is arranged between the inlet portion 15 and the outlet portion 16 of the screening arrangement 1. The screen holder arrangement 2 is arranged substantially equidistant from the outlet portion 16 and from the inlet portion 15 of the screening arrangement 1. This is due to the fact that the screening arrangement 1 is configured to be used together with two screening elements 91, 92 having substantially identical outer measurements. However, in other embodiments, the distance between the screen holder arrangement 2 and the inlet portion 15 may be greater, or smaller, than the distance between the screen holder arrangement 2 and the outlet portion 16 of the screening arrangement 1. Thus, different outer measurements may be used for the first screening element 91 and the second screening element 92.

(14) The screen holder arrangement 2 comprises a first screen connector 21 and a second screen connector 22. The first screen connector 21 is arranged below the second screen connector 22. The first screen connector 21 is arranged to allow one end of a first screening element 91 to be connected thereto, and the other end to a first tensioning element arranged adjacent to the outlet portion 16 of the screening arrangement 1. The second screen connector 22 is arranged to allow a second screening element 92 to be connected thereto, and to a second tensioning element arranged adjacent to the inlet portion 15 of the screening arrangement 1. The first and second tensioning elements can be tensioning elements readily available to the person skilled in the field of material screening. Thus, the specific configuration of these will not be described in further detail herein. The first and second screen connectors 21, 22 will be described in greater detail in relation to FIGS. 3a-d.

(15) Each one of the two side walls 11, 12 comprises a first guiding ledge 111 for guiding the first screening element 91 towards the first screen connector 21 of the screen holder arrangement 2.

(16) The first guiding ledges 111 extend perpendicularly from the inward facing sides 13 of the two side walls 11, 12, such that a ridge or sliding track is provided for the first screening element 91 to slide on upon insertion into the screening arrangement 1. This allows a screening element 91 to be inserted into the screening arrangement 1 by a single user, without requiring a second user's assistance in handling the screening element 91 as it is inserted into the screening arrangement 1.

(17) The first guiding ledges 111 extend a distance from the inward facing side 13 of the side walls 11, 12 such that they provide a seal between the side walls 11, 12 and the first screening element 91 when this has been inserted into the screening arrangement 1. This seal is formed by the lateral sides of the first screening element 91, i.e. the sides extending between the outlet portion 16 of the screening arrangement 1 and the screen holder arrangement 2, being covered by the first guiding ledges 111. Thus, material otherwise risking falling off the sides of the screening element 91 are prevented from doing so by the first guiding ledges 111, as these cover a space between the first screening element 91 and the inward facing sides 13 of the side walls 11, 12.

(18) Furthermore, each one of said two side walls 11, 12 comprises a second guiding ledge 112 for guiding said second screening element 92 towards the second screen connector 22. The second guiding ledge 112 is arranged to form a seal between the second screening element 92 and the inward facing sides 13 of the two side walls 11, 12. The second guiding ledge 112 share most features with the first guiding ledge 111, and will therefore not be discussed in greater detail herein.

(19) FIG. 2 is a perspective view of the screening arrangement 1 of FIG. 1, wherein a first and a second screening element 91, 92, have been connected thereto.

(20) What is shown in FIG. 2 could additionally or alternatively be referred to as a screening device 100 comprising a screening arrangement 1, and a first and a second screening element 91, 92 connected thereto. Also illustrated herein is a schematic representation of a material infeed, illustrated as a conveyor belt 3 having a discharge end located at a position above said input end 15 of said screening arrangement 1. Thus, material discharged from the conveyor belt 3 falls down on said second screening element 92 so that it may be screened by the screening device 100.

(21) FIG. 3A is a side view of the screen holder arrangement 2 according to one exemplary embodiment of the present invention. Shown herein is the first screen connector 21, which comprises a fixed element 211 extending between the inward facing sides 13 of the two side walls 11, 12, and a pivotable element 212 also extending between the inward facing sides 13 of the two side walls 11, 12. The pivotable element 212 is arranged such that it may pivot about an axis that is substantially perpendicular with the two side walls 11, 12, between a first position which allows a first screening element 91 to be inserted into the screening arrangement 1, and a second position which locks the first screening element 91 into connection with the first screen connector 21. In FIG. 3A, the pivotable element 212 is in the first position and the first screening element 91 has not been inserted into the screening arrangement 1.

(22) The pivotable element 212 comprises a connection portion 213 arranged to allow a first screening element 91 to be connected thereto. The connection portion 213 is an edge extending between said two side walls 11, 12, the edge being arranged to allow for example a hook-shaped end portion 911 of the first screening element 91 to be connected thereto.

(23) The first screen connector 21 further comprises an actuator, in FIG. 3A illustrated as a handle 214, connected to the pivotable element 212. The handle is arranged to control the pivot of the pivotable element 212, such that a user may move the pivotable element 212 between a first position and a second position. The handle 214 is arranged on the outward facing side 14 of one of the two side walls 11, 12, and connected to the pivotable element 212 by means of a connection joint 215 extending through the side wall 11, 12. The connection joint 215 is a rigid rod configured to translate a rotational movement or pivot of the handle 214 into a pivot of the pivotable element 212, such that a user may actuate the pivotable element 212 from outside the screening arrangement 1.

(24) As is shown in FIGS. 3A-D, the pivotable element 212 is arranged to pivot in an opening direction and a locking direction, between the first position and the second position, respectively. In FIG. 3A, the pivotable element 212 is in the first position and further movement in the opening direction is prevented by the pivotable element 212 abutting a blocking ledge 216 arranged in the pivot path of the pivotable element 212.

(25) The screen holder arrangement 2 shown in FIG. 3A also comprises a second screen connector 22. The second screen connector 22 is arranged to allow a second screening element 92 to be connected thereto, and comprises a fixed beam 221 having a connection portion 222 arranged to hold one end of said second screening element 92. The connecting portion 222 is an edge extending between said two side walls 11, 12, the edge being arranged to allow for example a hook-shaped end portion 921 of the second screening element 92 to be connected thereto. The second screen connector 22 is arranged above the first screen connector 21, such that the pivotable element 212 of the first screen connector 21 may pivot between two extreme positions defined by the blocking ledge 216 on one side, and a lower portion 223 of the fixed beam 221 of the second screen connector 22 on the other side.

(26) FIG. 3B is a side view of the screen holder arrangement 1 of FIG. 3A, wherein the pivotable element 212 of the first screen connector 21 is in the first position and a first screening element 91 is inserted into the screen holder arrangement 1. Here, the first screening element 91 has been inserted into the screening arrangement 1 by means of sliding on the first guiding ledges 111 of the two side walls 11, 12. The first screening element 91 comprises a screening mesh 912, and a hook-shaped end portion 911 for connecting the first screening element 91 to the pivotable element 212. In FIG. 3B, the first screening element 91 has been inserted to a point such that the hook-shaped end portion 911 has moved beyond the connection portion 213 of the pivotable element 212, thus allowing the pivotable element 212 to move to its second position before retracting the first screening element 91, thus connecting the hook-shaped end portion 911 to the connection portion 213 of the pivotable element 212.

(27) FIG. 3C is a side view of the screen holder arrangement 2 of FIG. 3A, wherein the pivotable element 212 of the first screen connector 21 is in the second position and a first screening element 91 is connected thereto.

(28) As shown herein, the pivotable element 212 has been moved to the second position and the first screening element 91 has been connected thereto. Thus, a seal has been formed between the first and second screen connectors 21, 22. This seal is formed by the hook-shaped end portion 911 of the first screening element 91 abutting the pivotable element 212 of the first screen connector 21 and a lower portion 223 of the fixed beam 221 of the second screen connector 22.

(29) As seen in FIGS. 3A-D, the pivotable element 212 is arranged to pivot about an axis that is vertically offset the plane in which the first screening element 91 is arranged to slide into position in. Specifically, the pivotable element 212 is arranged to pivot about an axis that is located below the plane in which the first screening element 91 is arranged to move. Furthermore, the pivotable element 212 is arranged such that tension from the first screening element 91, when connected to the pivotable element 212, causes the pivotable element 212 to be biased towards pivoting in a locking direction. In other words, the connection of the first screening element 91 to the pivotable element 212 further increases the strength of the seal between the first screen connector 21 and the second screen connector 22.

(30) FIG. 3D is a side view of the screen holder arrangement 2 of FIG. 3A, wherein the pivotable element 212 of the first screen connector 21 is in the second position and a first screening element 91 is connected thereto, and wherein a hook-shaped end portion 921 of the second screening element 92 is connected to the second screen connector 22. The second screening element 92 comprises a screen mesh 922 for screening a material held thereon. As is seen herein, there is little risk for material spillage between the second screening element 92 and the first screening element 91, as the first and second connectors 21, 22 are sealed against each other by means of the first end 911 of the first screening element 91. Thus, a screening device 100 with little risk of material spillage between the first screening element 91 and the second screening element 92 is provided.

(31) FIG. 4 is a side view of a mobile crushing and screening plant 9 with which the screening arrangement 1 of FIG. 1 may be used. The screening arrangement 1 may alternatively be used with other types of screening plants 9 than the one shown in FIG. 4.

(32) Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to “a/an/the [element, device, component, means, step, etc.]” are to be interpreted openly as referring to at least one instance of said element, device, component, means, step, etc., unless explicitly stated otherwise. Furthermore, any reference signs in the claims should not be construed as limiting the scope.