DE102014108167B4 - Inrun track ice cutter for a ski jump - Google Patents

Abstract

Inrun track ice cutter for a ski jump to create ruts with a rutting surface
with a right-hand milling head (1) and a left-hand milling head (1) which are each arranged on a drive shaft (2) rotatable about a rotation axis (A) arranged parallel to the groove surface and each have a plurality of milling blades (3), the milling blades (3) describe during a rotation of the left milling head (1) a left Fräskopfmesserumfang and at a rotation of the right milling head (1) describe a right Fräskopfmesserumfang,
characterized in that
on the right milling head (1) and on the left milling head (1) along the right Fräskopfmesserumfangs and along the left Fräskopfmesserumfangs three or more than three cutting blades (3) are mounted, each of the cutting blades (3) at an angle of more than 10 ° is arranged to an imaginary radius line between the cutting blade (3) and the axis of rotation (A).

Description

The invention relates to a run-track ice cutter for a ski jump. Such inrun track ice cutters for the ski jumping sport have at least one right-hand milling head and one left-hand milling head, which are each arranged on a drive shaft rotatable about a rotation axis and each have a plurality of milling blades. The milling blades describe a left Fräskopfmesserumfang in a rotation of the left milling head and a right Fräskopfmesserumfang with a rotation of the right milling head. After the inrun track of a ski jumping facility has been frozen, run-up marks with defined surface profiles are milled into their iced surfaces by rotation of the milling heads and along the run-up track in the direction of the track course. The surface profiles usually have longitudinal grooves which extend along the inrun track. These longitudinal grooves are important because over the longitudinal grooves the skydives do not contact the underlying ice. Sectionwise so there is air in the longitudinal grooves in the jump skis. The ski jumper can thereby achieve higher startup speeds.

From the DE 10 2009 052 924 B3 and the DE 10 2007 038 383 A1 Such inrun track ice makers are known. A disadvantage of the known start-track ice milling is, in particular, that the milled rut surfaces viewed along the start-up direction are not flat enough. It has been found that the rotating milling heads of the known inrun ice scraper, as viewed along the start-up direction, mill the ice in a slight wave motion. This is disadvantageous for ski jumpers, because this wave contour along the start-up direction on the jump animal in an irritating manner is noticeably disturbing.

The present invention is therefore based on the object to provide an ice cutter for the inrun of a ski jump, which overcomes the disadvantages mentioned.

This object is achieved by an ice cutter with the features of claim 1.

According to the invention, three or more than three cutting blades are mounted on the right-hand milling head and on the left-hand milling head, respectively, along the right-hand milling cutter's circumference and along the left-hand milling cutter's circumference. Furthermore, each of the cutting blades is arranged at an angle of attack of more than 10 ° to an imaginary radius line between the cutting blade and the axis of rotation.

Experiments have found that providing the milling heads, each with at least three cutting blades each with an angle of attack of more than 10 ° to an imaginary radius line between the cutting blade and axis of rotation makes it possible to mill starting tracks with rut surfaces, viewed along the direction of entry for the ski jumper as be sufficiently flat and thus ensure a quiet start on the hill. The groove surface is the imaginary plane of the flat areas next to the longitudinal grooves of the inrun track. The run-up skis glides on these areas and has no mechanical contact with the ice in the area of the longitudinal grooves because of the longitudinal grooves.

The ice maker may be wired with power, or wirelessly powered by a battery or by a fuel-burning engine, and has appropriate means for receiving power from a battery or fuel. The ice maker is particularly suitable for ice working in ruts with ice layers up to 10 cm in thickness. The profile characterizing the run-up track surfaces is determined by the structural design of the cutting blades. This usually depends on weather conditions. If a high volume of liquid, such as rain, is expected, a greater number of longitudinal grooves is preferred. During milling, the ice planer along the infeed direction of the inrun track d. H. following the track course moves and is preferably in particular on the side walls of the track grooves and / or on a track adjacent to the inrun track system.

The right or left milling head processes respectively the right and left ruts of the inrun track. The milling heads are preferably designed in each case such that they can be inserted from above into the track groove to be machined.

The cutting blades preferably comprise a stable water-resistant material such as steel. The cutting knives are preferably designed such that, when passing along the inrun track, they process the entire track width which is parallel to the axis of rotation and perpendicular or substantially perpendicular to the course of the inrun track. The cutting blades are inserted obliquely in relation to an imaginary radius line between the cutting blade and the rotation axis, so that they work the run-in track during milling paddle or blade-shaped.

The milling heads each have the at least three rigidly mounted, radially aligned cutting blades which, depending on the position of the axis of rotation, strike more or less obliquely on the ice over the track surfaces to be machined during milling. In this case, pointing away from the rut track wegbewegende cutter in reverse Direction preferably the same position as on the ice impacting cutting blades. Ie. the cutting blades are arranged on the milling head such that, during milling, a cutting blade striking the ice is arranged in a reversed position relative to a cutting blade moved away from the rut. Therefore, the ice can first be pushed down and then pushed up out of the rut and thrown out. Directional information described in the application refers to the operational installation position of the ice cultivator.

In a preferred embodiment, the right-hand milling head and the left-hand milling head have, in the region between adjacent milling blades, a milling-ice receiving section which extends from the adjacent milling blades and curves inwards towards the axis of rotation. Ice detached from the reamers by the cutter blades may be received in the cutter ice storage section. Thus, the ice, if it is not completely ejected from the rut, does not interfere with further milling. A jam of milled ice material could in extreme cases push the cutter upwards away from the inrun track, which, viewed in the start-up direction, can lead to unevenness in the rut surface.

Preferably, the cutting blades of the right milling head and the left milling head are evenly distributed over the right milling cutter blade periphery and over the left milling cutter blade periphery. By means of the uniform distribution of the cutting blades, a uniform removal of ice from the rut can be achieved at a constant speed of movement of the inrun track ice mill. In particular, in this embodiment, depending on the position of the axis of rotation over the rut surfaces, the cutters strike more or less obliquely on the ice, while milling cutters moving away from the rut are arranged in reverse position to them, the paddle-like throwing off of ice the ruts are supported advantageously. In particular, in an even number of cutting blades preferably two cutting blades are arranged on the milling head diametrically to each other.

In a preferred embodiment, the right milling head and the left milling head are coaxially arranged on the same drive shaft. They are thus rotatable about a common axis of rotation. As a result, a simple construction of the inrun ice scraper with only one axis to be driven and a uniform processing of the left and right inrun track can be realized.

Preferably, the right hand milling head and the left hand milling head continue to have the same number of cutting blades and are arranged along the common axis of rotation at an angle of 360 ° divided by twice the number of cutting blades out of phase. As a result, the cutting blades of the right and left milling heads always come alternately in material engagement with the ice on the inrun track. In this configuration, the drive axle does not experience at the same time on both milling heads an upward force directed away from the inrun track. The simultaneity of the material interference favors in the starting direction the formation of unevenness of the rut surfaces.

The milling cutters preferably have teeth for forming grooves in the groove inside surface. The number and shape of the serrations can vary depending on the rut dimensions. By means of the spikes, ruts are milled into the rut surface along the approach direction.

In a preferred embodiment, the cutting blades are each constructed from a plurality of Fräsmessklingen. Viewed in the direction of the right Fräsmessumfangs and in the direction of the left Fräsmesserumfangs the majority of Fräsmessklingen are flush next to each other on the right milling head and the left milling head fixed. Viewed in the direction of rotation of the milling heads, rear cutter blades with their milling edge protrude in the radial direction beyond the cutting edges of front cutter blades with a projection. The supernatant is preferably 0.5 to 3 mm. By this configuration, when milling a double or multiple blade effect can be exploited. The front cutter blade breaks a comparatively large amount of ice during the material intervention. The immediately following rear cutter blade blades cut a significantly lower ice volume in comparison. The surface of the brittle ice is much smoother after being cut or broken by means of the rear cutter blades compared to the front cutter blades.

If the cutting blades have teeth, they are formed on the Fräsmessklingen. The cutter blades are then preferably arranged such that the serrations of the front and front cutter blades overlap each other in overlapping areas such that the serrations of the front cutter blades completely overlap with the serrations of the rear cutter blades, but the rear cutter blades extend beyond the front cutter blades in the overhang. The supernatant preferably each forms an exposed edge portion of the rear cutter blades which is not covered by the front cutter blades and which conforms to the contour of the front cutter blades. The prongs of the front and rear cutter blades are preferably in contact with each other, ie not offset arranged to each other. The contour and the number of teeth of the front and rear cutter blades are preferably the same.

In a preferred embodiment, the cutting blades are fixed via Messerfixiermittel releasably fixed to the right milling head and the left milling head. On the one hand, it is easy to replace faulty cutting blades. On the other hand, instead of the cutting blades, other milling cutters such as differently shaped or size-varying milling cutters or other devices such as brushes can also be fastened to the milling head, which extends the useful radius of the ice planer. The embodiment enables a layered processing of the track inner surfaces. For example, in a milling process with a first milling cutter for "rough milling" d. H. Milling for the removal of much ice from the rut, for example with an acceptable smooth rutting surface and in a further milling process with a second cutter for "fine milling" d. H. Milling machines are used to produce ruts with an extremely smooth rutting surface. Furthermore, can be adjusted by this embodiment using a single ice mill different depths. Examples of knife fixing means are screws and the like. The cutting blades and the milling heads each have suitable recesses for receiving the Messerfixiermittel.

Preferably, the ice grinder has a plurality of cutting blades for replacing the mounted cutting blade, wherein the angle of attack is variable by the structural design of the releasably fixed cutting blade. The angle of attack is variable, for example, by variations in thickness of the cutting blades.

Alternatively or additionally, the Messerfixiermittel are designed such that, alternatively or in addition to the cutter blades brushing devices are fixed to the milling heads, with which a milled inrun track can brush out. With the brushing devices, the milled rutting surface surfaces can be further smoothed and / or cleaned with their grooves.

In a preferred embodiment, the milling heads and / or the cutting blades are formed heatable. If the milling head and / or the cutting blades are heated during milling, they will prevent the possibility of ice formation. It is also conceivable that other components of the run-track ice grinder are heated, so that the milling heads and / or cutting blades are heated indirectly in this way.

Hereinafter, by way of example, possible embodiments of the milling head of the ice griller will be described with reference to the figures. The same or similar elements are denoted by the same reference numerals.

It shows:

1 a schematic perspective view of a first embodiment of a milling head;

2 a schematic perspective view of a second embodiment of the milling head;

3 a schematic perspective view of a third embodiment of the milling head; and

4 a schematic perspective view of a fourth embodiment of the milling head;

1 shows a schematic perspective view of a first embodiment of a milling head 1 , The milling head 1 has a bore (not visible) in the center, in which a drive shaft 2 is arranged, which is rotatable about an axis of rotation A and the milling head 1 drives during milling. At the milling head 1 are three cutting blades 3 arranged along a Fräskopfmesserumfangs. Each of the cutting blades 3 is at an angle of more than 10 ° to an imaginary radius line between the cutting blade 3 and the rotation axis A is arranged. Each of the cutting blades 3 each has a front cutter blade 30 and a rear cutter blade 31 on, with regard to the Fräsmesserumfangs considered the Fräsmessklingen 30 . 31 flush next to each other on the milling head 1 using knife fixatives 4 such as screws are fixed. In the direction of rotation of the milling head 1 The rear cutter blades protrude 31 with its milling edge in the radial direction over the milling edges of front cutter blades 30 with a supernatant U out. The cutter blades 30 . 31 each have spikes 33 on, with which ruts can be produced in the track to be machined. The spikes 33 the front cutter blades 30 are overlapping to the tines of the rear cutter blades 31 arranged so that the cutter blades 30 and 31 except in the supernatant U of the rear cutter blade 31 rest on each other. The front cutter blades 30 obscure in each case in plan view from their side on the cutting blade 3 the rear cutter blades 31 except the supernatant U of the rear cutter blades 31 that blades an exposed edge area of the rear cutter blades 31 forms the contour of the front Fräsmesserklinge 30 is adjusted. The contour and the number of spikes 33 are with the cutter blades 30 and 31 equal. The milling head 1 also has milling ice storage sections 10 suitable for picking up milled ice during milling.

2 shows a schematic perspective view of a second embodiment of the milling head 1 , The milling head 1 corresponds to that in the 1 shown milling head 1 with the difference that the cutting blades 3 each in addition to the front cutter blade 30 and to the rear cutter blade 31 another rear cutter blade 32 seen in the direction of the Fräsmesserumfangs considered with the Fräsmessklingen 30 . 31 flush next to each other on the milling head 1 is fixed. In the direction of rotation of the milling head 1 viewed the other rear cutter blade protrudes 32 with its milling edge in the radial direction over the milling edges of the front Fräsmesserklinge 30 and the rear cutter blade 31 out. There is thus a projection U both between the other rear cutter blade 32 and the rear cutter blade 31 as well as between the rear cutter blade 31 and the front cutter blade 30 , The spikes 33 the other rear cutter blade 32 are with respect to the tines of the rear cutter blade 31 arranged as it is with respect to the rear cutter blade 31 and front cutter blade 30 in 1 is described.

3 shows a schematic perspective view of a third embodiment of the milling head 1 , The milling head 1 corresponds to that in the 1 shown milling head 1 with the difference that the cutting blades 3 in each case only a single cutter blade 30 each having means of the fixing 4 on the milling head 1 is attached.

4 shows a schematic perspective view of a fourth embodiment of the milling head 1 , The milling head 1 corresponds to that in the 3 shown milling head 1 with the difference that the milling head 1 along its Fräskopfmesserumfangs four cutting blades 3 and four milling ice receiving sections each 10 having. Two blades each 3 are arranged diametrically to each other.

LIST OF REFERENCE NUMBERS

1

milling head

10

Fräseisaufnahmeabschnitt

2

drive shaft

3

Removal Bits

30

front cutter blade

31

rear cutter blade

32

another rear cutter blade

33

Pink

4

Messerfixiermittel

A

axis of rotation

U

Got over

Claims (11)

Inrun track ice cutter for a ski jumping hill for the creation of ruts with a rutting surface with a right milling head ( 1 ) and a left-hand milling head ( 1 ), which in each case on a about a parallel to the rutting surface arranged axis of rotation (A) rotatable drive shaft ( 2 ) are arranged and in each case a plurality of cutter blades ( 3 ), wherein the cutting blades ( 3 ) during a rotation of the left milling head ( 1 ) describe a left Fräskopfmesserumfang and with a rotation of the right milling head ( 1 ) describe a right Fräskopfmesserumfang, characterized in that the right milling head ( 1 ) and on the left milling head ( 1 ) along the right Fräskopfmesserumfangs and along the left Fräskopfmesserumfangs three or more than three cutting blades ( 3 ), each of the cutting blades ( 3 ) at an angle of attack of more than 10 ° to an imaginary radius line between the cutting blade ( 3 ) and rotation axis (A) is arranged. Inrun track ice machine according to claim 1, characterized in that the right-hand milling head ( 1 ) and the left milling head ( 1 ) in the area between adjacent cutter blades ( 3 ) one of the adjacent cutter blades out, inwardly to the axis of rotation (A) out arched Fräseisaufnahmeabschnitt ( 10 ) exhibit. Inrun track ice cutter according to claim 1 or 2, characterized in that the cutting blades ( 3 ) of the right milling head ( 1 ) and the left milling head ( 1 ) are evenly distributed over the right hand cutter blade circumference and over the left hand cutter blade periphery. Inrun track ice machine according to claim 3, characterized in that the right-hand milling head ( 1 ) and the left milling head ( 1 ) coaxially on the same drive shaft ( 2 ) are arranged and are thus rotatable about a common axis of rotation (A). Inrun track ice machine according to claim 4, characterized in that the right-hand milling head ( 1 ) and the left milling head ( 1 ) the same number of cutting blades ( 3 ) and are arranged along the common axis of rotation (A) viewed at an angle of 360 ° divided by twice the number of cutting blades out of phase. Inrun track ice machine according to one of the preceding claims, characterized in that the cutting blades ( 3 ) each of a plurality of Fräsmessklingen ( 30 . 31 . 32 ) are constructed, wherein viewed in the direction of the right Fräsmesserumfangs and in the direction of the left Fräsmesserumfangs the plurality of Fräsmessklingen ( 30 . 31 . 32 ) flush next to each other on the right-hand milling head ( 1 ) and on the left milling head ( 1 ) are fixed and wherein in the direction of rotation of the milling heads ( 1 ) regards rear cutter blades ( 31 . 32 ) with its milling edge in the radial direction over the milling edges of front cutter blades ( 30 ) protrude with a supernatant (U). Inrun track ice cutter according to claim 6, characterized in that the supernatant (U) is 0.5 to 3 mm. Inrun track ice machine according to one of the preceding claims, characterized in that the cutting blades ( 3 ) via knife fixing agent ( 4 ) detachable on the right milling head ( 1 ) and on the left milling head ( 1 ) are fixed. Inrun track ice cutter according to claim 8, characterized in that the ice mill comprises a plurality of cutter blades ( 3 ) for replacing the mounted cutting blades ( 3 ), wherein the angle of attack by the structural design of the releasably fixed cutting blade ( 3 ) is changeable. Inrun track ice machine according to one of claims 8 or 9, characterized in that the blade fixing means ( 4 ) are formed such that as an alternative or in addition to the cutting blades ( 3 ) Brushing devices on the milling heads ( 1 ) are fixable with which a milled inrun track can brush out. Inrun track ice mill according to one of the preceding claims, characterized in that the milling heads ( 1 ) and / or the cutting blades ( 3 ) are formed heated.

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