DE10053845A1 - Improvements for sieve boxes - Google Patents

Abstract

The invention relates to a sieve box 1 comprising at least a first sieve 2 with a first field 21 which is fastened on the sides by means of a tension connection to the anchoring points 26 on the sides of the sieve box and a second field 22 which is connected between cross members 34, 39 at the ends Clamping connection is attached. The first screen field 21 fastened to the sides by means of a tension connection is located at the feed end 11 of the screen box and can be curved around an axis which runs along the screen box. It can be shorter than the second screen field 22 of the first screen. There is also disclosed a sieve box for swingable sieving means, the sieve box being mounted on a base frame via elastic suspension units 51, 52 in such a way that its own weight is borne, means 7, 76 being provided to transmit vibrational forces to the sieve box 1, whereby the transmission means are essentially unloaded if there are no vibrations and no screenings are processed. The sieve box 1 can be mounted on a base frame 6 via elastic suspension units 74, means 7, 76 being provided to transmit vibrational forces to the sieve box 1 and the sieve box comprising sieve side walls 4 which are connected to one another by cross members 32 to 38 which are screwed to the sieve side walls.

Description

The present invention relates to sieve boxes.

Sieve boxes are u. a. in quarries, landfill sites, Use coal, sand and gravel pits, construction sites and the like det to different materials, u. a. Solid waste, smashed rock, coal, sand, gravel, rubble, clay, Sieve peat, compost, sludge, ash and mineral ores.

In a typical sieving device with such a sieve The screenings are first placed in a hopper above given an inclined retaining grid made up of rods hardened steel and retains oversized material. The Oversized material is usually dropped on the floor. The Material that falls through the retention grille reaches one Conveyor, optionally via a coarse screen, and will then promoted upwards and falls on the task or upper End of an inclined sieve box that is inclined downwards is ordered and located either below the conveyor located or as an external extension of the conveyor is seen. The sieve box contains one or more sieves in order separate the material into two or more grain size fractions. The Material is then piled up to transport facilities (the possibly include other funding devices) or to other processing facilities.  

A screen box of a machine with a high throughput has typically a nominal size of 1.5 x 3.0 m; to the Handling the sieves from time to time due to wear or Damage must be replaced, to facilitate and order To secure the sieves in the sieve box, it is known to secure the sieves in to divide two fields, both a size of 1.5 × 1.5 m to have. Such sieve fields are on cross members in the middle of the Sieve box attached and are supported by a movable support kept under tension at each end of the sieve box.

Such an arrangement has been used successfully for years, but it has now been recognized that the conventional arrangement differs has disadvantages, and it is accordingly the task of the present invention, a new and improved Siebka most available.

According to the invention, a sieve box is proposed which has a sieve (hereinafter referred to as "first sieve") with a first field summarizes that is attached to the sides by a clamping connection and a second field that is attached to an end wall by a span connection is attached.

Such an arrangement is new and allows a certain amount sidedness in the arrangement of the sieve fields of the sieve, whereby specific aspects of screen construction their own special Have advantages.

It is particularly preferred that the said on the sides first screen field attached to the up by a tension connection end of the sieve box is provided, because with this configuration ration the advantages achieved by the present invention most obvious.

In embodiments of the invention, in which the said screen box comprises more than one such sieve, it is particularly advantageous  if said first sieve is the upper sieve of the sieve box, because even with this configuration the Er benefits are most noticeable.

Preferably, said first is on the sides by a Clamping connection fastened first screen field arched around an axis that runs along the sieve box. Such an arrangement is by a tension connection to the sides of the screen field simplified compared to a tension connection to the end walls, and it has the advantage that the screenings when they hit one such a curved screen field rather on both sides of the screen box is distributed. Since screenings show a tendency to be in the middle Settling the area of this screen field becomes a uniform one Material distribution across the width of the screen is supported, creating a increased sieving performance is achieved.

In preferred embodiments of the invention, the first field is the first sieve shorter (measured along the sieve box) than that second field of the first sieve. We have noticed that the main cause of damage or wear to the sieve or sieves of the sieve box is the impact of the material to be sieved, if it is from a Conveyor falls on the sieve. Hence the end of the task most affected by the first sieve. The use of this special combination of preferred freely selectable features offers economic advantages that are that the the first field of the sieve can be replaced independently of the second can, and since it is (for a given screen box size) shorter than the second sieve field and therefore shorter than the previously known sieve fields is that it can be easier and cheaper. A suitable size of the by means of a tension connection to the screen th fortified sieve field is one third of the total length of the first sieve, with a particularly preferred one Execution whose length is about a quarter of the total length of the upper sieve. Most of the impact damage fin takes place in this quarter of the screen length, and use this combination of features therefore improves maintenance efficiency.  

To give deformations for the first sieve and one resulting from it de limit deflection, it is advantageous to use the first sieve to be supported by crossbeams on the sieve side walls are consolidated.

Advantageously, said first sieve is made by cross members supported, which comprise a welded lattice, so out leads is that it called the first field of the first sieve carries and at least a middle cross member and at least comprises a central screen frame longitudinal member. The use The use of such a welded grille is very lengthy tion of the useful life of the first field of the first Siebes bei. Furthermore, the or each of the cross members can this Be curved to give the screen field a curvature, if desired.

In the most preferred embodiments of the invention is the Siebka Most elastically mounted on a base, and there are Mit tel provided to vibrate the screen box. Vibrating sieves are known as such and have compared to the Fixed seven has the advantage that it has a much larger maximum Throughput (tons / hour) possible for a certain screen size chen.

Preferably, the sieve box is mon on the base tiert that its own weight by elastic suspension members is worn, with means for transmitting vibration forces are provided on the sieve box, which essentially are unencumbered if no vibrations are generated and none Screenings is processed. This allows lighter elements to Vibration transmission can be used as otherwise possible would, in turn, be weight, material and cost savings and it simplifies the damping of the reaction vibrations on the base and the rest of the device act.  

This feature is actually of particular practical importance tion, regardless of whether a by means of a clamping connection first screen field attached to the sides is present or not and it is assumed that it is a novelty acts. Accordingly, according to the second aspect, the above lying invention a sieve box for vibrating sieve means provided, the screen box by means of elastic suspension units is mounted on the base in such a way that Dead weight is borne and funds are provided to Transfer vibrational forces to the screen box, this Transmission means are essentially unencumbered, if none Vibrations are generated and if no screenings are processed becomes.

In the most advantageous embodiments of the present invention are the sieve box and the sieve side walls by cross beams interconnected, which is screwed to the side walls are. Such cross beams are useful to screen fields during the Support the operation of the screen box. It is known to be cross member to be provided, which are welded to the sieve side walls. Ver screw connections, in particular so-called "huck" screw connections, which as certain advantages are particularly advantageous le versus welding. When a sieve box is made is done by placing crossbeams between a pair of screen side walls welded in, certain inevitable stresses arise in the frame of the sieve box. The constant vibration of the Sieve box is exposed during operation increases these loads with the result that the sieve box shows fatigue fracture and cracks form. The use of screws for loading Strengthening the screen box reduces these disadvantages.

Great importance is attached to this characteristic, and according to a third aspect of the present invention proposed a sieve box, which means on a base elastic suspension units is mounted, whereby means  are provided to apply vibratory forces to the screen box transferred, the screen box comprising screen side walls, the connected by crossbeams on the sides walls are screwed on.

The means for transmitting the swine preferably comprise forces on the sieve box, an eccentric shaft that runs across the Underframe and to the sieve box runs as well as means to drove this wave. This can be very simple and robust Means for transmitting the necessary vibrational forces to be provided.

Such a shaft preferably carries on both sides of the screen box an asymmetrical balance flywheel. This helps the Schwin reaction forces that lead to the base and therefore also to the remaining device to be forwarded to decrease.

The means for transmitting the vibrations are preferred mounted elastically on the base. This measure can if help to reduce the vibration of the base adorn.

In an advantageous embodiment, the vibrations are transmitted de shaft held in a bearing that ela over elastomer blocks is mounted on the base frame. The use of such Elastomer blocks support the damping of vibrations be directed to the base.

It is intended to place a sieve box according to the invention on a Way to use mounted that he from his task end to its discharge end is inclined downwards. So it can Screenings with the help of natural gravity through the screen box fall.

Means are advantageously provided for the angle of this Tendency to change. This allows the incline to be as desired  can be set to optimal throughput of different To achieve grain sizes or types of screenings.

In these embodiments according to the invention, it is advantageous that each side wall of the screen box has suspension brackets, which are close to the end of the task and the discharge sends the sieve box, each of these brackets is arranged in such a way that it prevents the sieve box from moving against a working axis that is opposite a fictional line that slopes the suspension brackets this respective side of the sieve box connects, the acute angle between the fictitious line and the working axis the discharge end is smaller than the acute angle between this line and the work axis of the end of the task. This encourages a good support for the weight of the sieve box the suspensions that relate to these suspension brackets support.

The screen box is preferably tiltable between a first one Inclination angle at which the working axes of the units of the Tasks are essentially vertical, and a second Inclination angle at which the working axes of the units of the End of discharge are essentially vertical.

In an advantageous embodiment, the aforementioned screen box is a multi-layer sieve box, with at least one lower sieve in it is provided below the first sieve. This makes it possible Sieving of materials that are fed into the sieve box in at least three different size classes. The lower sieve can be carried out in the same way, if so desired, or completely on the end walls by means of a tension connection be attached.

A preferred embodiment is only given as an example below described with the accompanying diagrams, where:  

Fig. 1 is a perspective side view from above and from the discharge end, showing a screen box according to the Invention, wherein the screen box is mounted on a base frame;

Fig. 2 is a perspective view of the sieve box according to the invention according to Fig. 1 from above, from the end of the support and from one side;

Fig. 3 is a perspective view of the screen box of Fig. 1 from below, from the feed end and from the other side;

Figures 4a and 4b are side elevations of the other side of the screen box of Figure 1; and

Fig. 5 shows a section along the line VV in Fig. 4a, which also represents the base.

In the drawings, a screen box 1 comprises a first screen 2 with a first field 21 which is fastened to the sides by means of a tension connection and a second field 22 which is fastened to the end walls by means of a tension connection. The sieve fields are in the. Figure to see. 4a and 4b.

The design of the screen box shown is a multi-deck screen box, with a lower screen 23 below the first screen 21 , 22 . This enables the separation of materi al. that is fed to the sieve box, in at least three different size classes. The lower sieve 23 can be designed in the same manner, if desired, or can be completely fastened to the end face by means of a tensioning connection and can be designed as a single sieve field or, as shown, as a sieve 24 , 25 .

The first sieve field 21, which is fastened to the sides by means of a clamping connection, is located at the feed end 11 of the sieve box 1 , since the advantages achieved by the present invention are most obvious in this configuration. A Spannver connection to the sides is carried out in a suitable manner by the sides of the first screen field 21 are attached to the anchoring points 26 .

The first screen field 21 fastened to the sides by means of a clamping connection is shorter (measured along the screen box 1 ) than the second field 22 of the first screen. The main cause of damage or wear on the first sieve of a sieve box is the impact of the sieved material when it falls from a conveyor onto the first sieve. Therefore, the end of the first sieve is most affected. The use of a short first sieve field at the end of the feed offers economic advantages, because the first sieve field can be replaced independently of the second, and because it is (for a given sieve box size) shorter than the second sieve field and therefore shorter than previously known sieve fields it be easier and cheaper. A suitable order of magnitude of the screen field attached to the sides by means of a tension connection is approximately a quarter of the total length of the upper screen, since in this quarter of the screen length most of the impact damage occurs.

In order to limit deformations of the first screen fields 21 , 22 and a consequent deflection, they are supported by cross members 31 to 39 , which are fastened to the screen side walls 4 . The feed end field 24 of the lower sieve 23 is held by the cross members 40 to 43 and the discharge end field 25 of the lower sieve 23 is held by the cross members 44 to 47 .

Apart from the fact that these cross members are screwed to the screen side walls, the arrangement of the lower screen shown in Fig. 4a is a conventional one. On end end 24 of the lower sieve is fixed between the cross members 40 and 43 at the ends by means of a tension connection, while the discharge end field 25 of the bottom sieve between the cross members 44 and 47 is fastened at the ends by means of a tension connection. These sieve fields are supported by intermediate cross members 41 , 42 and 45 , 46 , respectively. These intermediate cross members are located above the levels that contain the respective tensioning connecting elements, so that the two sieve fields are each held in tension in a curvature about a transverse axis. This ensures that the sieve fields are taut and well supported to achieve a long service life and effective screening. The discharge end field 22 of the first screen 2 is held in the same way by means of a clamping connection at the ends between the cross members 34 and 39 and via the intermediate cross members 35 to 38 , these also being arranged such that the discharge end field 22 of the first screen 2 is in a curvature is kept under tension around a transverse axis.

The cross members 31 to 33 are welded to a grid 3 , which serves to support the first screen field 21 of the first screen fastened to the sides by means of a tension connection. The grid 3 comprises at least one central cross member and at least one central screen box frame longitudinal member. The use of such a welded grille greatly increases the useful life of this first field of the first screen. The upper edges of the cross members 31 to 33 of this grid 3 are bent to give the first screen field 21 a curvature, since it is clamped on the sides of the screen box.

The first sieve field 21, which is fastened to the sides by means of a tensioning connection, is arched in this way about an axis which runs along the Siebka most 1 . Such an arrangement is made possible by the fact that the screen field is fastened to the sides by means of a tension connection instead of being fastened to the ends by means of a tension connection, and it has the advantage that if screened material falls onto such a curved screen field, it tends to be on both sides of the screen Sieve box is distributed, which naturally supports an even distribution of material across the width of the sieve, which in turn leads to increased sieving performance.

The screen box 1 is elastically mounted by means of four suspension units 5 on a base frame 6 , and means 7 are seen in order to set this screen box in vibration. Vibrating sieves per se are known and have the advantage over fixed sieves that they enable a much larger maximum throughput (tons / hour) for a certain sieve size.

In the embodiment shown, the sieve box 1 is mounted on the base frame 6 so that its own weight is borne by elastic suspension units, the means 6 for transmitting vibration forces to the sieve box being essentially unloaded when no vibrations are generated and no material to be sieved is processed. As a result, lighter elements can be used for vibration transmission than would otherwise be possible, which in turn results in weight, material and cost savings, and it simplifies the damping of the reaction vibrations that act on the base and the rest of the device.

This feature forms the second aspect of the present inven tion and provides a screen box 1 for swingable screen means, the screen box 1 by means of elastic suspension units 5 is mounted on the base 6 such that its own weight is borne, and means 7 are provided, to transmit vibrational forces to the sieve box 1 , these transmission means being essentially unloaded when there are no vibrations and no material to be screened is being processed.

The means 7 for transmission of vibratory forces to said cleaning shoe 1 comprises a shaft 71 which is transverse to the base frame 6 and the sieve box 1, and is respectively supported in bearings 72, 73, the side walls of the base frame 6 and the screen 4 are mounted. The shaft 71 holding bearings 72 are elastically mounted on the base frame 6 via elastomer blocks 74 in order to reduce the transmission of vibrations to the base frame. A pulley 75 is provided to set the shaft in rotation.

The shaft 71 is eccentric, so that the axis on the bearings 73 on the screen box is offset by a few millimeters from the axis on the bearings 72 on the base frame. An offset of 3 mm results in a vibration amplitude of 6 mm, which is considered suitable for most purposes. The shaft carries an asymmetrical balance flywheel 76 on both sides of the screen box 1 in order to reduce the reaction vibration forces which are transmitted to the base frame and therefore also to the rest of the device. Within the sieve box, the eccentric shaft 71 is surrounded by a housing 77 in order to protect it from the material to be sieved. The housing 77 is screwed to the screen side walls 4 .

In the illustrated embodiment according to the invention, the sieve box 1 comprises sieve side walls 4 , which are connected to one another by cross members 31 to 39 and 40 to 47 and which are “piggybacked” on the sieve sides.

According to the foregoing, the present invention provides a screen box 1 , which is mounted on a base frame 6 via elastic suspension units 5 , means 7 for transmitting vibrational forces to the screen box 1 being seen and the screen box 1 holding screen side walls 4 around, which are connected to one another by cross members 31 to 47 , which are screwed to the screen side walls 4 .

It is intended to use a screen box according to the invention so that it is inclined downwards from its feed end 11 to its discharge end 12 . This allows the screenings to fall through the screen box using natural gravity.

They are means (not shown) for changing the Nei supply angle provided, which are known as such. The This allows inclination to be set as desired optimal throughput of different grain sizes or types of To achieve screenings.

Each side wall of the screen box carries suspension brackets 51 , 52 , which are located near the feed end 11 and the discharge end 12 , respectively, each of which brackets is arranged to support the screen box against work movements along a work axis 53 , 54 opposite to one fictional line 55 is inclined, which connects the suspension brackets on this respective side of the screen box. The acute angle β between the fictitious line 55 and the working axis 54 of the discharge end is smaller than the acute angle α between this line and the working axis 53 of the feed end. As a result, the weight of the sieve box can be borne well by the suspension units based on these suspension brackets, and it is particularly advantageous if the inclination of the sieve box 1 is variable.

The screen box may, for example, be tiltable between a first angle of inclination at which the working axes of the suspension ends 51 of the feed end are substantially vertical and a second angle of inclination at which the working axes of the suspension brackets 52 of the discharge end are substantially vertical.

As can be seen in Fig. 4b, the inclination of the task end field 24 of the lower sieve 23 can be changed, for. B. by 3 ° by lifting the task end of this field. Sometimes it is desirable to increase the inclination of the feed field of a sieve, whether to promote the cutting of the material to be cut if this field is designed as a harp sieve instead of a mesh sieve, or simply to move the material to be moved faster while the second field falls less steeply to enable better screening of the screenings.

Reference list

1

Sieve box

2nd

first sieve

3rd

Grid that supports the first screen field at the end of the task

4

Screen side wall

5

Suspension unit

6

Underframe

7

Vibrator

11

End of task

12th

Discharge end

21

Screen field of the first screen at the end of the task

22

Screen field of the first screen at the end of the discharge

23

lower sieve

24th

Screen field of the lower screen at the end of the task

25th

Screen field of the lower screen at the end of the discharge

26

Anchoring point for the side attachment

30th

Longitudinal member of the grid

31

Cross member of the grid

32

middle cross member of the grid

33

Cross member of the grid

34

End clamp connection cross member for the first screen at the discharge end

35

Intermediate cross member to hold the first sieve at the end of the carrier

36

Intermediate cross member to hold the first sieve at the end of the carrier

37

Intermediate cross member to hold the first sieve at the end of the carrier

38

Intermediate cross member to hold the first sieve at the end of the carrier

39

End clamp connection cross member for the first screen at the discharge end

40

Bottom sieve end-tensioning cross member at the end of the feed

41

Intermediate cross member of the lower sieve at the end of the feed

42

Intermediate cross member of the lower sieve at the end of the feed

43

Bottom sieve end-tensioning cross member at the end of the feed

44

Bottom strainer end-tensioning cross member at the discharge end

45

Intermediate cross member of the lower sieve at the discharge end

46

Intermediate cross member of the lower sieve at the discharge end

47

Bottom sieve end-tensioning cross member at the end of the feed

51

Suspension unit at the end of the task

52

Suspension unit at the end of the discharge

53

Axis of the suspension unit at the end of the task

54

Axis of the suspension unit at the discharge end

71

wave

72

Bearing on the base

73

Bearing on the sieve box

74

Elastomer blocks

75

Pulley

75

flywheel

77

Shaft housing

Claims (21)

1. Sieve box ( 1 ) comprising a sieve ( 2 ) (hereinafter referred to as the first sieve) with a first field ( 21 ) which is fastened to the sides by a tension connection and a second field ( 22 ) which is on an end wall is fastened by a tension connection. 2. Screen box according to claim 1, characterized in that the first field ( 21 ) of the first screen attached to the sides by a tension connection is provided at the feed end ( 11 ) of the screen box. 3. Sieve box according to claim 1 or 2, characterized in that the first, attached to the sides via a clamping connection first sieve field ( 21 ) is curved around an axis which runs along the sieve box ( 1 ). 4. Screen box according to one of the preceding claims, characterized in that the first field ( 21 ) of the first screen is shorter than the second field ( 22 ) of the first screen. 5. Screen box according to claim 4, characterized in that the first field ( 21 ) of the first screen ( 2 ) makes up less than a third of the total length of the first screen. 6. Screen box according to one of the preceding claims, characterized in that the first screen ( 2 ) is held by cross members ( 31 to 38 ) which are attached to the screen side walls ( 4 ). 7. Screen box according to claim 6, characterized in that said first screen ( 2 ) is held by cross members which comprise a welded grid ( 30 , 31 , 32 , 33 ) which is designed to be said first field ( 21 ) of the first screen ( 2 ) carries and comprises at least one central cross member ( 32 ) and at least one central box frame longitudinal member. 8. Screen box according to one of the preceding claims, characterized in that the screen box ( 1 ) via a suspension ( 5 ) is mounted on a base frame ( 6 ) and means ( 7 ) are provided to set the screen box in vibration. 9. Screen box according to claim 8, characterized in that the screen box is mounted in a manner on the base frame that its own weight is supported by elastic suspension elements ( 5 ) and wherein the means ( 7 ) for transmitting vibrational forces to the screen box ( 1 ) are essentially unencumbered if no vibrations are generated and no screenings are processed. 10. Sieve box for vibrating sieve means, characterized in that the sieve box ( 1 ) by means of elastic Aufängungsein units ( 5 ) is mounted on the base ( 6 ) in such a way that its own weight is borne and means ( 7 ) are seen before to vibrational forces to transfer the screen box, these transfer means being essentially unloaded if no vibrations are generated and no screenings are processed. 11. Sieve box according to one of claims 8 to 10, characterized in that the sieve box comprises sieve side walls ( 4 ) which are connected to one another by cross members ( 31 to 38 ) which are screwed to the sieve side walls. 12. Sieve box, which is mounted on a base frame by means of elastic suspension units ( 5 ), characterized in that means ( 7 ) are provided to transmit vibrational forces to the sieve box ( 1 ), the sieve box comprising sieve side walls ( 4 ) through Cross members ( 31 to 38 ) are connected to each other, which are screwed to the screen side walls. 13. Sieve box according to one of claims 8 to 12, characterized in that the means for transmitting vibrational forces to the sieve box an eccentric shaft ( 71 ) which extends transversely to the lower frame ( 6 ) and the sieve box ( 1 ), and means ( 75 ) to drive this shaft. 14. Screen box according to claim 13, characterized in that said shaft ( 71 ) carries an asymmetrical balance flywheel ( 76 ) on both sides of the screen box. 15. Screen box according to one of claims 8 to 14, characterized, that the means for transmitting the vibrations are elastic are mounted on the base.   16. Sieve box according to claim 15, characterized in that the vibration-transmitting shaft ( 71 ) is held by a bearing which is mounted ela stically on the base frame ( 6 ) via elastomer blocks ( 74 ). 17. Sieve box according to one of the preceding claims, characterized in that the sieve box is mounted so that it is inclined downwards from a feed end ( 11 ) to a discharge end ( 12 ). 18. sieve box according to claim 17, characterized, that means are provided to ver the angle of inclination to change. 19. Sieve box according to one of claims 8 to 16 and according to one of claims 17 or 18, characterized in that each side of the sieve box ( 1 ) has suspension brackets ( 51 , 52 ) which are each in the vicinity of the feed end ( 11 ) and the discharge end ( 12 ), each of these brackets being arranged to support the screen box against work movements along a work axis ( 53 , 54 ) inclined to a fictitious line ( 55 ) which the suspension brackets on the respective one Side of the sieve box connects and the acute angle (β) between the fictitious line ( 55 ) and the working axis ( 54 ) of the discharge end is smaller than the acute angle (α) between this line ( 55 ) and the working axis ( 53 ) of the Task. 20. Sieve box according to claims 18 and 19, characterized in that the sieve box ( 1 ) is tiltable between a first inclination angle, in which the working axes ( 53 ) of the feed end units ( 51 ) are substantially vertical, and a second inclination angle , in which the working axes ( 54 ) of the discharge end units ( 52 ) are essentially vertical. 21. Sieve box according to one of the preceding claims, characterized in that said sieve box ( 1 ) is a multi-layer sieve box and comprises at least one lower sieve ( 23 ) which is provided underneath the first sieve ( 2 ).