FI128813B - Screening, crushing or mixing blade arrangement arranged in a bucket of a working machine - Google Patents

Abstract

The present invention relates to a screening, crushing or mixing blade arrangement arranged in a machine bucket (1), comprising one or more non-circular rotatable shafts (4) and transmission means for rotating the shafts. Each shaft is provided with a plurality of interchangeable blades (5) which are freely displaceable in the longitudinal direction of the shaft, which blades are mounted either directly on the shaft and / or by means of a separate holder, the blades (5) extending radially outwards from the shaft. The blades and / or holders have a non-circular mounting hole (8) substantially corresponding to the cross-section of the shaft. The shaft (4) is provided with at least one thinning point (10) and the mounting hole (8) of each blade (5) and / or holder is formed discontinuously on its inner surface (8a) by providing a mounting hole (9) opening radially outwards in the mounting hole (8). dimensioned so that the blade (5) and / or the holder can be inserted into the shaft (4) at the shaft thinning point (10) through said mounting hole (9) and moved in the longitudinal direction of the shaft (4) to the desired position on the shaft.

Description

The present invention relates to a screening, crushing or mixing blade arrangement arranged in a machine bucket, comprising one or more non-circular rotatable shafts and transmission means for rotating the shafts. fitted with a plurality of interchangeable blades which are freely displaceable in the longitudinal direction of the shaft, which blades are mounted either directly on the shaft and / or by means of a separate holder, the blades extending radially outwards from the shaft, the blades and / or holders having a shaft cross-section substantially non-circular mounting hole.

The arrangement according to the invention is suitable for use, for example, in connection with a screen arranged in the bucket of a working machine disclosed in DE202006001257 U1, which screen is particularly suitable for screening soils. The implement can be, for example, an excavator, a wheel loader, a telehandler or other suitable mobile implement. The screen has a screen surface with slots, below which there are rotatable shafts of polygonal cross-section, on which protruding blades rotating with the shafts are mounted, which extend through the slots of the screen surface above the screen surface. The blades are axially displaceable along the respective shafts and can be replaced by disassembling the shafts from the screen and then removing the replaceable blades from the shafts and installing new blades. Figures 1 and 2 schematically show a screening arrangement mounted on the bucket 1 of a mobile work machine according to the prior art. The arrangement comprises a screen surface 2 arranged in the load space inside the bucket 1, with> 25 slots3 which determine the screening roughness. The ends of the separate> screen plates forming the screen surface are fixed in place by fastening strips 7 which keep the screen plates O at a distance from each other corresponding to the desired screen slot 3. The screen slots 3 continue N uniformly all the way between the fastening strips of the opposite ends of the screen plates, = thereby creating unnecessary obstacles to the flow of material. The channel of the screen surface is rotatable shafts 4, on which are arranged blades 5 extending outwards from the shaft in the radial direction N, which in the mounted state of the screen extend through the slots 3 of the screen surface 3. The shafts are connected to a transmission device arranged inside the housing 6 on the side of the bucket 1 for rotating the shafts. The transmission device can be on either side of the bucket 1.

A similar screening arrangement is also used, for example, in screen crushers where special crushing blades are used and in mixers where special mixing blades are used.

- In these prior art solutions, the replacement of the blades requires the removal of the shafts from the bucket, which is relatively laborious, because first the transmission equipment has to be dismantled and then the shaft can be removed from the bucket. This is difficult especially in construction site conditions.

The object of the present invention is to provide a solution by which the workload required for the replacement of blades can be substantially reduced and the replacement of blades can also be carried out in construction site conditions without lifting aids.

To achieve this object, the arrangement according to the invention is characterized in that the shaft is provided with at least one thinning point and that the mounting hole of each blade and / or holder is formed discontinuously on its inner surface by providing a mounting opening radially outwardly dimensioned so as to: the blade can be inserted into the shaft through the mounting hole mentioned at the point of thinning the shaft and moved in the longitudinal direction of the shaft to the desired position on the shaft.

The invention will now be described with reference to the accompanying drawings, in which: Figure 1 shows a screen bucket according to the prior art in a schematic> 25 principle view,> Figure 2 shows the screen bucket according to Figure 1 with the screen surface removed, Figure 3 shows a schematic diagram of an embodiment of the arrangement according to the invention. Fig. 4 shows a detail of the arrangement according to Fig. 3 in an enlarged view during the installation of the blades,

Fig. 5 shows a detail of the arrangement of Fig. 3 in an enlarged view with the blades mounted in place, Fig. 6 shows an exploded view of the shaft of the system according to the invention at one end, and Fig. 7 shows a schematic view of an embodiment of a screening blade used in the arrangement. Figures 1 and 2 show a screen bucket arranged at a distance from a mobile work machine according to the prior art, which has been described in more detail in the introduction above.

Fig. 3 shows a schematic schematic diagram of an embodiment of an arrangement according to the invention, in which a screening blade assembly arranged on three shafts 4 is shown.

The assembly is arranged in a screen space 17 between the side walls 16a, 16b inside the bucket body. The shafts 4 extend between said space and further in part 4a (Fig. 6) to a transmission device arranged inside the housing 6.

In the embodiment shown, the shaft 4 is provided with a thinning point 10 of circular cross-section in the end region adjacent to the side wall 16a of the shaft 4 towards the screen space 17.

The thinning point 10 can also be made round.

Figure 3 also shows a fender 18, which is described in more detail in the applicant's European patent EP2216448B1. The fender can also be omitted in the arrangement according to the present invention. > 25 - Fig. 4 shows the arrangement according to Fig. 3 in a slightly enlarged view. > An embodiment of the blade 5 included in the arrangement is shown in more detail in Fig. 0 7. In the exemplary embodiment shown, the blade 5 is formed as a plate-like screening K blade and has a thickness-extending mounting hole 8 having an inner surface 8a corresponding to the cross-sectional shape of the shaft 4.

The thickness S of the blade 5 is preferably dimensioned to substantially correspond to the width of the screen slot 3.

The blades 5 can also be arranged two or more in parallel in a correspondingly enlarged gap 3 between two screen plates.

The mounting hole 8 is made discontinuous in the circumferential direction of its inner surface 8a by forming a radially outwardly opening mounting hole 9, the width W of which is dimensioned so that the blade 5 can be pushed onto the shaft 4 at the thinning point 10. When the blade 5 is pushed into the shaft thinning point. 10 and the mounting hole 8 is mounted aligned with the outer surface of the shaft 4, the blade 5 can be moved in the axial direction of the shaft 4 to the desired position on the shaft 4.

- The cross-section of the shaft 4 and the corresponding design of the inner surface 8a of the mounting hole 8 are preferably made so that the blade and / or the blade holder can be placed at different angular positions with respect to the shaft 4 along the circumferential dimension of the shaft and locked against rotation. If necessary, a securing member (not shown) closing the mounting opening 9 can also be arranged in the blade 5 or in the blade holder, whereby the mounting hole 8 is uniform in its inner surface along the entire circumference, ensuring that the blade or blade holder remains on the shaft. The thinning point 10 of the shaft 4 can also be used, for example, to mount spacers or other possibly necessary members on the shaft by forming - a mounting hole 8 similar to the blade 5. This can be applied, for example, to a shaft mounting blade holders on which replaceable blade pieces can then be mounted. replacement can be done without removing the holders from the shaft. This solution makes it possible to change the holders relatively easily to other types of holders, e.g. to change the screening blades to a crushing or mixing blade, whereby the possibility of using the device is diversified with relatively small measures. By implementing, for example, a screen crusher with the holder solution according to the invention, welding of the holders to the shaft of the drum and possible problems arising therefrom are avoided. Fig. 5 shows a situation in which the blades 5 are mounted on the shaft 4 and the> 25 thinning point 10 is covered by cover pieces 11a, 11b locked in the end flange 14 shown in Fig. 6, which rests on the shaft and protrudes with the shaft. The cover pieces 11a, 11b are shaped in their outer surface to correspond to the appearance of the shaft 4, whereby, if necessary, a blade 5 can also be moved on them. + 30 S Figure 6 shows an exploded view of some parts belonging to the arrangement. The outermost end portion 4a of the shaft 4D extends inside the transmission apparatus. Of the transmission equipment, only the gears 12, the bearing 13, the seal 15 are shown N and its operation and structure will not be described in more detail in this connection.

In the above embodiment, the shaft 4 is shown to extend in its end region 4a inside the transmission device, whereby its disassembly requires disassembly of the transmission device. The shaft can also be made more easily detachable by dimensioning it to extend only between the inner surfaces 16a and 16b of the screen space 17 and by providing the shaft ends with a design that allows them to engage with the respective end of the transmission shaft, the covers 11a, 11b acting as a shaft and as interlocking members of the output shaft. In addition to the above-provided solution with a screen surface, the solution according to the invention is also suitable for applications without a screen surface, such as, for example, in a screening, crushing or mixing bucket according to US7913430B2.

o

O OF

O <Q

NN

I Jami a

LO OF LO

LO o o

OF

Claims (8)

Patent claims A screening, crushing or mixing blade arrangement arranged in a bucket (1) of a work machine comprising one or more non-circular rotatable shafts (4) and transmission means for rotating the shafts, each shaft being provided with a plurality of replaceable, longitudinal freely displaceable blades (5), the blades being mounted either directly on the shaft and / or by means of a separate bracket, the blades (5) extending radially outwardly from the shaft (4), and the blades and / or the brackets having a non-circular mounting heel (8) substantially corresponding to the shaft cross-section, characterized in that the shaft (4) is provided with at least one thinning point (10) and that the mounting heel (8) for each blade (5) and / or hopper is formed discontinuously on its inner surface (8a) by providing a radially outwardly opening mounting hall (9) which is dimensioned so that the blade (5) and / or the holder can be moved to the shaft (4) through said mounting height! (9) in the thinning point (10) of said shaft and - movable in the longitudinal direction of the shaft (4) to the desired position on the shaft. Arrangement according to Claim 1, characterized in that the mounting opening (9) can be closed by means of a separate closing piece. Arrangement according to claim 1 or 2, characterized in that the design of the outer surface of the shaft (4) and the corresponding design of the inner surface (8a) of the mounting heel (8) are designed so that the blade and / or the holder can be placed in different angular positions relative to the shaft along the circumferential dimension of the shaft (4) and is shape-readable against rotation. o 25 O Arrangement according to one of Claims 1 to 3, characterized in that a root canal is formed on the shaft (4) in the region of each of the shaft (4) and / or at the point x between the ends of the shafts (4). => 30 - Arrangement according to one of Claims 1 to 4, characterized in that the thinning (10) made on the S-axis (4) has a circular or non-circular cross section. > N Arrangement according to one of Claims 1 to 5, characterized in that the arrangement further comprises cover pieces (11a, 11b) which can be mounted at the thinning point of the shaft. Arrangement according to one of the preceding claims, characterized in that the arrangement comprises intermediate parts which can be mounted on the shaft (4) between the blades (5) and / or the blade plates, with a corresponding peripheral discontinuous mounting hall (8). Arrangement according to one of the preceding claims, characterized in that the shaft (4) is arranged to be replaced without removing the transfer elements from the bucket. O N O N O <Q + O I jami a LO N LO LO o o N