CN114247638A

CN114247638A - Screening machine

Info

Publication number: CN114247638A
Application number: CN202111573985.3A
Authority: CN
Inventors: 李金川; 李军; 许创
Original assignee: Jiangsu XCMG Construction Machinery Institute Co Ltd
Current assignee: Jiangsu XCMG Construction Machinery Institute Co Ltd
Priority date: 2021-12-21
Filing date: 2021-12-21
Publication date: 2022-03-29

Abstract

The invention discloses a screening machine, which comprises: a housing; an inlet; the screen is obliquely arranged in the shell relative to the horizontal plane and comprises a plurality of screen bars; the first bearing part is used for bearing fine materials; the second bearing part is used for bearing coarse materials; a mobile device, comprising: the movable frame is positioned below the screen; the plurality of material ejecting parts are arranged on the movable frame and are arranged at intervals along a first direction; the two ends of the first connecting frame rod are respectively hinged with the movable frame and the shell; the driving device is in driving connection with the first connecting frame rod and is used for driving the first connecting frame rod to rotate relative to the shell; the mobile device is configured to: in the material ejecting state, the driving device drives the first connecting frame rod to rotate relative to the shell, so that the acting force of the material ejecting part entering the corresponding first gap on the contacted material on the screen enables the material to have a movement trend of moving upwards along the direction vertical to the inclined surface of the screen and a movement trend of moving downwards along the inclined direction of the screen.

Description

Screening machine

Technical Field

The invention relates to the field of material screening machinery, in particular to a screening machine.

Background

The material that places such as ore dressing factory, coal preparation factory, coking plant often have narrow and small space needs sieve the operation, and current screening machine needs the screen cloth to have great inclination (the angle needs to be greater than the material pile angle), and the requirement in narrow and small space is often difficult to satisfy to prior art's screening machine. Meanwhile, large materials are easy to clamp in the screen, so that the screening efficiency is reduced, and the screen needs to be cleaned regularly.

Disclosure of Invention

The invention aims to provide a screening machine which can meet the requirement of a narrow space and has a good screening effect.

The invention discloses a screening machine, which comprises:

a housing;

the inlet is arranged on the shell and used for inputting materials to be screened;

the screen is used for screening materials, is obliquely arranged in the shell relative to the horizontal plane, is positioned below the inlet, and comprises a plurality of screen bars arranged at intervals along a first direction, and the upstream of the screen is higher than the downstream of the screen along the oblique direction of the screen;

the first bearing part is arranged on the shell and used for bearing fine materials passing through the screen mesh in the materials;

the second receiving part is arranged on the shell and used for receiving coarse materials which do not pass through the screen and move downwards along the inclined direction of the screen;

the mobile device, has the liftout state, includes:

the movable frame is positioned below the screen;

the plurality of ejection parts are arranged on the movable frame and are arranged at intervals along a first direction, and each ejection part corresponds to a first gap between a pair of adjacent screen bars;

the two ends of the first connecting frame rod are respectively hinged with the movable frame and the shell;

the driving device is in driving connection with the first connecting frame rod and is used for driving the first connecting frame rod to rotate relative to the shell;

wherein the mobile device is configured to: in the material ejecting state, the driving device drives the first connecting rod to rotate relative to the shell, so that the acting force of the material ejecting part entering the corresponding first gap on the contacted material on the screen causes the material to have a movement trend of moving upwards perpendicular to the inclined surface of the screen and a movement trend of moving downwards along the inclined direction of the screen.

In some embodiments, the driving device includes a crank, and a connecting rod hinged to the crank and the first link rod at two ends, respectively, the crank, the connecting rod, the first link rod and the housing form a crank-rocker mechanism, and the crank is disposed upstream of the first link rod along an oblique direction of the screen.

In some embodiments, the movable device further includes a second side link hinged to the movable frame and the housing at two ends, and a connecting line between a hinge point of the second side link and the movable frame and a hinge point of the housing is parallel to and equal to a connecting line between a hinge point of the first side link and the movable frame and a hinge point of the first side link and the housing.

In some embodiments, the drive device further comprises an eccentric disposed on the housing, the eccentric comprising an eccentric shaft forming the crank.

In some embodiments, the driving device further includes a driving motor disposed on the housing, and the driving motor is configured to drive the eccentric rotating shaft to rotate.

In some embodiments, the driving device further comprises a first sprocket fixedly connected to the eccentric shaft, a second sprocket drivingly connected to the driving motor, and a chain connecting the first sprocket and the second sprocket.

In some embodiments, the ejector is a strip-shaped plate arranged parallel to the screen bars, and the first gap between a pair of adjacent screen bars corresponds to one of the strip-shaped plates.

In some embodiments, the strip-shaped plate is located in a first gap between corresponding adjacent screen bars, and a second gap and a third gap are formed between the strip-shaped plate and two screen bars on two sides of the corresponding first gap, and the second gap and the third gap are both configured to allow fine materials to pass through and not allow coarse materials to pass through; when the screening machine works, the strip-shaped plate is not lower than the two corresponding screen bars on two sides of the first gap along the direction vertical to the inclined surface of the screen.

In some embodiments, the screen panel includes an upper end plate located upstream in an inclined direction of the screen panel and a lower end plate located downstream, the two ends of the screen bars are connected to the upper end plate and the lower end plate, respectively, and the connection ends of the screen bars and the lower end plate are bent downward in a direction perpendicular to the inclined surface of the screen panel.

In some embodiments, an access panel is removably attached to the housing.

According to the screening machine provided by the invention, the movable frame with the material ejecting part is arranged below the screen, when the screening machine works, the driving device drives the first connecting frame rod to rotate, the first connecting frame rod drives the material ejecting part to stir coarse materials through the first gap through the movable frame, and a force which acts on the coarse materials in the upward direction perpendicular to the inclined surface of the screen and in the downstream direction along the surface of the screen is provided for the coarse materials, so that the coarse materials can be disturbed, the fine materials can enter the screen to be screened more, the movement of the coarse materials from the surface of the screen to the downstream direction can be accelerated, and the requirement of the screen for setting a larger inclination angle is reduced.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

figure 1 is a schematic structural view of a screening machine according to an embodiment of the present invention;

figure 2 is a schematic illustration of an explosive structure of the sizer shown in figure 1;

FIG. 3 is a schematic illustration of the configuration of the housing of the sizer shown in FIG. 1;

FIG. 4 is a schematic diagram of the construction of a screen of the sizer shown in FIG. 1;

FIG. 5 is a schematic illustration of a portion of the mobile of the sizer shown in FIG. 1;

FIG. 6 is a schematic illustration of a portion of the screen machine shown in FIG. 1;

FIG. 7 is a schematic view of an alternate angular configuration of the structure of FIG. 6 in one state;

FIG. 8 is a schematic view of another angular configuration of the structure of FIG. 6 in another state;

figure 9 is a schematic diagram of the eccentric of the sizer shown in figure 1.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The upper part and the lower part of the application are both referred to the position of the screening machine in normal working. As shown in fig. 1 and 2, the screening machine of the present embodiment includes a housing 1, an inlet 11, a screen 2, a first receptacle 12, a second receptacle 13, and a mobile device.

The inlet 11 is arranged on the shell 1, and the inlet 11 is used for inputting materials to be screened;

as shown in fig. 1, 2, 4 and 6, a screen 2 is used for screening materials, and the screen 2 is provided in the housing 1 to be inclined with respect to a horizontal plane. The screen 2 is located below the inlet 11, and the screen 2 receives the material input from the inlet 11 and screens the material. The screen 2 comprises a plurality of screen bars 21 spaced apart in a first direction, which in the embodiment shown is perpendicular to the inclined surface of the screen 2. A first gap is formed between adjacent screen bars 21. In the direction of inclination of the screen 2, the upstream of the screen 2 is higher than the downstream. The screen 2 is obliquely arranged, so that coarse materials in the materials which cannot pass through the screen can slide or roll to the lower part under the action of gravity, and fine materials in the materials pass through the screen 2 through the first gap.

The first receiving part 12 is arranged on the shell 1, and the first receiving part 12 is used for outputting fine materials which pass through the screen 2 in the materials. The fine material passes through the screen 2 and reaches the first receiving part 12, the first receiving part 12 can be a collecting device, the fine material is collected and then processed in the next step, and the first receiving part 12 can also be an output port for outputting the fine material to other devices.

The second receiving portion 13 is provided on the housing 1, and the second receiving portion 13 is used for outputting coarse material which does not pass through the screen 2 and moves downstream along the inclination direction of the screen 2. The coarse material slides or rolls down along the inclined surface of the screen 2 and reaches the second receiving part 13, the second receiving part 13 may be a collecting device for collecting the coarse material and then performing the next processing, and the first receiving part 13 may also be an output port for outputting the coarse material to other devices.

The movable device has a material ejecting state. The movable device comprises a movable frame 31, a plurality of lifters 32, a first link rod 41 and a driving device. The liftout state is the state when liftout portion stirred the material on the screen cloth.

The movable frame 31 is located below the screen 2. The plurality of lifters 32 are provided on the movable frame 31, the plurality of lifters 32 are arranged at intervals in the first direction, and each lifter 32 corresponds to a first gap between a pair of adjacent screen bars 21. As shown in fig. 8, when the ejector 32 is in the ejecting state, the ejector 32 is located in the first gap.

Two ends of the first linking rod 41 are respectively hinged with the movable frame 31 and the shell 1; the driving device is in driving connection with the first linking rod 41, and the driving device is used for driving the first linking rod 41 to rotate relative to the housing 1.

Wherein the mobile device is configured to: in the ejecting state, the driving device drives the first frame rod to rotate relative to the housing 1, so that the acting force of the ejecting part 32 entering the corresponding first gap on the contacted material on the screen 2 causes the material to have a moving trend of moving upwards in the direction perpendicular to the inclined surface of the screen 2 and a moving trend of moving downwards in the inclined direction of the screen 2.

The inclined surface of the screen 2 refers to the upper surface, i.e. the surface which is in contact with the coarse material during screening operation. In the ejecting state, when the first link rod 41 rotates relative to the housing 1, the first link rod 41 drives the movable frame 31 to rotate, the movable frame 31 rotates to drive the ejecting portion 32 to rotate, the ejecting portion 32 moves towards the direction protruding out of the screen 2, the ejecting portion 32 contacts with the coarse material, the rotating ejecting portion applies a tangential force tangential to the coarse material in the rotating direction, the tangential force enables the coarse material to have a movement tendency that the material moves upwards along the direction perpendicular to the inclination direction of the screen 2 and a movement tendency that the material moves downwards along the inclination direction of the screen 2, that is, the acting force of the ejecting portion on the material in the ejecting state can be decomposed into component forces in two directions, namely upwards along the direction perpendicular to the inclination direction of the screen 2 and downwards along the inclination direction of the screen 2. In the embodiment shown in fig. 6 to 8, during the rotation of the first link rod 41, in the material ejecting state, as shown in fig. 8, the material ejecting portion 32 protrudes upward in the direction perpendicular to the inclined surface of the screen cloth 2 and moves over the surface of the screen bars 21, and in the non-material ejecting state, the material ejecting portion 32 falls back to the position flush with the screen bars 21 in the direction perpendicular to the inclined surface of the screen cloth 2. In some embodiments, not shown in the figures, the lifters 32 may also be located below the screen cloth 2 in a non-lifted state, not in the first gaps, in a direction perpendicular to the inclined surface of the screen cloth 2, in which lifters 32 only enter the corresponding first gaps. In the liftout state, liftout portion 32 can surpass or not surpass grating 21, and when not surpassing grating 21, liftout portion 32 contacts with the part that coarse material card was gone into in the first clearance, and liftout portion 32 stirs coarse material.

The screening machine of this embodiment, through the adjustable shelf 31 that has liftout portion 32 in the setting of screen cloth 2 below, at the screening machine during operation, drive arrangement drives first rack pole 41 and rotates, first rack pole drives liftout portion 32 through adjustable shelf 31 and stirs thick material, give thick material one simultaneously at the inclined surface of perpendicular to screen cloth 2 upwards and along the power that screen cloth 2 surface acted on to the downstream direction, thereby can disturb thick material, make thin material leave thick material, make more thin material sieve in getting into screen cloth 2, improve the screening effect, can also promote thick material to follow the downstream direction's of screen cloth 2 surface motion simultaneously, reduce the requirement that screen cloth 2 set up great inclination.

In some embodiments, as shown in fig. 1, 5, 7 and 8, the driving device comprises a crank, a connecting rod 52 hinged at both ends to the crank and the first link rod 41, respectively, the crank, the connecting rod 52, the first link rod 41 and the housing 1 form a crank-rocker mechanism, and the crank is disposed upstream of the first link rod 41 in the tilting direction of the screen 2.

In the crank rocker mechanism that forms, casing 1 is the frame, first side link 41 is the rocker, the first side link 41 of articulate rotation drive swings back and forth, first side link 41 of pivoted drives adjustable shelf 31 and rotates, thereby it rotates to drive liftout portion 32, when the liftout state, liftout portion 32 rotates to the material contact on the surface with screen cloth 2, make the material on screen cloth 2 surface have along the direction of the inclined surface of perpendicular to screen cloth 2 toward the motion trend of top motion and along the incline direction of screen cloth 2 toward the motion trend of downstream. Owing to form crank rocker mechanism, the rocker that the first connecting rod 41 of this embodiment formed has the snap-back characteristic at reciprocating motion in-process, thereby in a cycle of crank uniform velocity pivoted, first hack lever 41 is more than (working direction is anticlockwise in the example of fig. 7, also the downstream wobbling direction of the incline direction of toward screen cloth 2) first hack lever 41 is faster when swinging along the direction opposite with working direction, time is less than, thereby first hack lever 41 drives liftout portion 32 and upwards takes up than more than along the direction of the incline surface of perpendicular to screen cloth 2, promptly mobile device can carry out the liftout to the material on screen cloth 2 surface in more times, further improve the screening effect to the material.

In some embodiments, as shown in fig. 1, 2, 5, 7 and 8, the mobile device further includes a second side link 42 hinged to the mobile frame 31 and the housing 1 at two ends, respectively, and a connecting line of a hinge point of the second side link 42 to the mobile frame 31 and a hinge point to the housing 1 is parallel to and equal to a connecting line of a hinge point of the first side link to the mobile frame 31 and a hinge point to the housing 1. Namely, the first side link 41, the movable frame 31, the second side link 42 and the housing constitute a parallelogram mechanism. With this arrangement, the movable frame 31 can be driven to rotate more stably, and the movable device can operate more stably and effectively. In the embodiment shown in the figures, the first side link 41 is mounted to the housing 1 through a first bearing 411 to be hinged with the housing 1, and the second side link 42 is mounted to the housing 1 through a second bearing 421 to be hinged with the housing 1.

In some embodiments, as shown in fig. 1 to 2 and 5 to 9, the driving device further comprises an eccentric device 51 provided on the housing 1, the eccentric device 51 comprising an eccentric rotating shaft 511, the eccentric rotating shaft 511 forming a crank. The eccentric rotary shaft 511 is mounted to the housing 1 through a rotary shaft bearing 512. The crank for driving the link 52 to rotate is formed by driving the eccentric rotary shaft 511 to rotate in the portion where the rotary shaft bearing 512 is engaged.

In some embodiments, as shown in the figure, the driving device further includes a driving motor 71 disposed on the housing 1, and the driving motor 71 is used for driving the eccentric rotating shaft 511 to rotate.

In some embodiments, as shown, the driving device further includes a first sprocket 73 fixedly connected to the eccentric shaft 511, a second sprocket 72 drivingly connected to the driving motor 71, and a chain 74 connecting the first sprocket 73 and the second sprocket 72. The drive motor 71 is drivingly connected to the second sprocket 72 via a coupling.

In some embodiments, as shown in fig. 5 to 8, the lifters 32 are strip-shaped plates arranged in parallel with the screen bars 21, and the first gap between a pair of adjacent screen bars 21 corresponds to one strip-shaped plate. Liftout portion 32 is set up to the BAR shaped plate, and under the liftout state, liftout portion 32 can be to the material liftout of more positions with exert the effort, further helps improving the screening effect.

In some embodiments, the strip-shaped plate is located in the first gap between the corresponding adjacent screen bars 21, and the strip-shaped plate and two screen bars 21 on both sides of the corresponding first gap form a second gap and a third gap, and the size of each of the second gap and the third gap is configured to allow fine material to pass through and not allow coarse material to pass through; when the screening machine works, the strip-shaped plate is not lower than the two screen bars 21 on the two sides of the corresponding first gap along the direction vertical to the inclined surface of the screen 2. In this embodiment, the screening size is determined by the strip-shaped plate and the screen bars together, the strip-shaped plate is located between two adjacent screen bars 21, the size of the gap between the strip-shaped plate and the screen bars on the two sides is the screening size, the fine material passes through the screen mesh through the second gap and the third gap, and the coarse material cannot pass through the second gap and the third gap. At the in-process of screening machine work, along the perpendicular direction of the inclined surface with screen cloth 2, the bar board is higher than or minimum and two grating 21 parallel and level of the first clearance both sides that correspond to second clearance and third clearance can not the grow, help guaranteeing that the thin material that sieves out satisfies the standard, guarantee the screening effect.

In some embodiments, as shown in fig. 2, 4 and 6, the screen 2 includes an upper end plate 22 located upstream and a lower end plate 23 located downstream in the direction of inclination of the screen 2, the ends of the screen bars 21 are connected to the upper end plate 22 and the lower end plate 23, respectively, and the connecting ends of the screen bars 21 and the lower end plate 23 are bent downward in the direction perpendicular to the inclined surface of the screen 2. I.e. the screen bars 21 extend from upstream to downstream, will bend downwards as they approach the lower end plate 23, and the lower end plate 21, which is connected to the screen bars 21, will also be located below the inclined surface of the screen cloth 2. This arrangement helps to avoid blockage by the lower end plate 23 when coarse material moves downstream away from the inclined surface of the screen 2 and leaves the screen from the downstream end of the rider bar 21, reducing jamming caused by the lower end plate 23. In the embodiment shown in the figures, the upper end plate 22 and the lower end plate 23 are fixedly connected to the housing 1.

In some embodiments, as shown in figures 1 and 2, the screening machine further includes an access panel 61 removably attached to the housing 1. Set up and overhaul apron 61, overhaul the apron through dismantling, can maintain the screening machine in order to obtain great maintenance space, at the during operation, install and overhaul apron 61 and can protect the screening machine.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.

Claims

1. A screening machine, comprising:

a housing (1);

the inlet (11) is arranged on the shell (1) and is used for inputting materials to be screened;

the screen (2) is used for screening materials, is obliquely arranged in the shell (1) relative to the horizontal plane and is positioned below the inlet (11), and comprises a plurality of screen bars (21) which are arranged at intervals along a first direction, and the upstream of the screen (2) is higher than the downstream along the oblique direction of the screen (2);

the first bearing part (12) is arranged on the shell (1) and is used for bearing fine materials which pass through the screen (2) in the materials;

the second receiving part (13) is arranged on the shell (1) and is used for receiving coarse materials which do not pass through the screen (2) and move downwards along the inclined direction of the screen (2);

the mobile device, has the liftout state, includes:

a movable frame (31) located below the screen (2);

the ejection parts (32) are arranged on the movable frame (31) and are arranged at intervals along a first direction, and each ejection part (32) corresponds to a first gap between a pair of adjacent screen bars (21);

the two ends of the first connecting frame rod (41) are respectively hinged with the movable frame (31) and the shell (1);

the driving device is in driving connection with the first connecting frame rod (41) and is used for driving the first connecting frame rod (41) to rotate relative to the shell (1);

wherein the mobile device is configured to: in the material ejecting state, the driving device drives the first connecting rod (41) to rotate relative to the shell (1), so that the acting force of the material ejecting part (32) entering the corresponding first gap on the contacted material on the screen (2) enables the material to have a motion trend of moving upwards along the direction vertical to the inclined surface of the screen (2) and a motion trend of moving downwards along the inclined direction of the screen (2).

2. The screening machine according to claim 1, characterized in that said drive means comprise a crank, a connecting rod (52) hinged at both ends to said crank and to said first link rod (41), respectively, said crank, said connecting rod (52), said first link rod (41) and said casing (1) forming a crank-rocker mechanism and being arranged upstream of said first link rod (41) in the direction of inclination of said screen (2).

3. The screening machine according to claim 2, characterized in that said mobile means further comprise a second side link (42) hinged at both ends to said mobile frame (31) and to said casing (1), respectively, the connection of the hinge point of said second side link (42) to said mobile frame (31) and to the hinge point of said casing (1) being parallel and equal to the connection of the hinge point of said first side link (41) to said mobile frame (31) and to the hinge point of said casing (1).

4. A screening machine according to claim 2, characterized in that the drive means further comprise an eccentric (51) provided on the casing (1), the eccentric (51) comprising an eccentric shaft (511), the eccentric shaft (511) forming the crank.

5. A screening machine according to claim 4, characterised in that the drive means further comprise a drive motor (71) provided on the housing (1), the drive motor (71) being adapted to drive the eccentric rotor shaft (511) in rotation.

6. A screening machine according to claim 5, characterised in that the drive means further comprise a first sprocket wheel (73) fixedly connected to the eccentric shaft (511), a second sprocket wheel (72) drivingly connected to the drive motor (71) and a chain (74) connecting the first sprocket wheel (73) and the second sprocket wheel (72).

7. A screening machine according to claim 1, characterised in that the ejector (32) is a strip arranged parallel to the screen bars (21), the first gap between a pair of adjacent screen bars (21) corresponding to one of the strips.

8. A screening machine according to claim 7, characterised in that the strip is located in a first gap between corresponding adjacent screen bars (21) and forms a second and a third gap with two screen bars (21) on either side of the corresponding first gap, the second and third gaps each being dimensioned to allow the passage of fine material and not coarse material; when the screening machine works, the strip-shaped plates are not lower than the two corresponding screen bars (21) on two sides of the first gap along the direction vertical to the inclined surface of the screen (2).

9. A screening machine according to claim 1, characterised in that the screen cloth (2) comprises an upper end plate (22) located upstream and a lower end plate (23) located downstream in the direction of inclination of the screen cloth (2), the two ends of the screen bars (21) being connected to the upper end plate (22) and the lower end plate (23), respectively, the ends of the screen bars (21) connected to the lower end plate (23) being bent downwards in a direction perpendicular to the inclined surface of the screen cloth (2).

10. A screening machine according to claim 1, further comprising an access panel (61) removably attached to the housing (1).