EP1666671B1 - Milling device for trench walls - Google Patents

Description

The invention relates to a trench cutter with a trimming frame, at least one bearing plate, which is arranged on the trimming frame, at least one arranged on the bearing plate axis, at least one cutting wheel with a Fräsradnabe, which is rotatably mounted on at least one bearing on the axis, a drive means for rotationally driving the at least one cutting wheel, a drive train arranged at the top of the bearing plate and at least one sealing element arranged between the bearing plate and the cutting wheel for sealing the bearing against the surroundings of the trench wall cutter.

A trench wall cutter according to the preamble of claim 1, for example, from the DE 196 52 022 C2 known. In this known trench cutter a Fräsradantrieb is arranged for rotationally driving the cutting wheels above the bearing plate on the cutter frame. For torque transmission from the cutting wheel drive to the cutting wheels, a drive shaft is provided which extends in a tubular drive train in the bearing plate.

From the EP-A-0 518 293 is a milling frame for a trench wall cutter with oil-lubricated bearing seals for the cutting wheels and with a regulated hydraulic pressure compensation device for the bearing seals described. The bearing seals are connected via lines with a pressure-resistant oil reservoir, wherein vertically below the oil reservoir, a buffer space is present, which is open at the bottom and filled with air, where it is the external pressure is exposed. The oil reservoir and the buffer space are connected to each other via a longitudinally displaceable piston and the piston is biased by a compression spring in the direction of the oil reservoir.

The object of the invention is to provide a particularly reliable and economically operable trench wall cutter.

The object is achieved by a trench cutter with the features of claim 1. Preferred embodiments are given in the dependent claims.

The trench wall cutter according to the invention has at least one lubricating device for feeding Lubricant to the sealing element, and has a Schmiermitteleinführöffnung, which is located above the cutting wheel.

A basic idea of the invention can be seen to provide a lubricating device for lubricating the sealing element, wherein the lubricating device has an insertion opening for lubricant, which is arranged in an area spaced from the Fräsradnabe area. Such an arrangement of the lubricant inlet opening is particularly advantageous if the sealing element is covered by the cutting wheel and / or the bearing plate to the environment. If, in this case, a lubricating device, for example a lubricating nipple, is provided with a lubricant introduction opening directly on the sealing element, it is necessary to supply fresh lubricant, at least partially dismantle the cutting wheel from the cutting wheel hub, which is associated with undesirable downtimes and a comparatively high amount of work. In contrast, can be introduced into the lubricating device in the inventive arrangement of the lubricant inlet opening lubricant without disassembly of the cutting wheel and / or the bearing plate, whereby a particularly labor-consuming and thus economical operation of the trench wall cutter is made possible. In addition, the inventive arrangement of the lubricant inlet opening also allows a continuous supply of lubricant in the lubricating device, whereby a particularly reliable lubrication of the sealing element and thus a particularly reliable milling operation is made possible. According to the invention, the lubricant can be supplied with rotating gear and / or cutting wheel, in particular in the milling operation, which allows a particularly uniform distribution of the lubricant on the sealing element even at low Einpressdrücken. Local overloads on the sealing element can be largely avoided. The lubricant may be, for example, an oil and / or a grease.

Under the drive train can be understood in particular according to the invention arranged between the milling frame and the end shield device, which serves for supplying drive energy from the milling frame to the cutting wheel. For this purpose, for example, a drive shaft may be provided in the drive train, which connects a drive motor arranged on the milling frame with the cutting wheel. Alternatively or additionally, hydraulic pressure lines for supplying a drive motor arranged on the bearing plate for the cutting wheel can also be provided in the drive train. The drive train may be formed as a recess, for example as a bore in the bearing plate.

A structurally particularly simple trench wall cutter is provided according to the invention in that the lubrication device has at least one lubricant supply channel, on which end the lubricant introduction opening is arranged, the lubricant supply channel running at least in sections along the drive train in the bearing plate. In a particularly simple to manufacture trench wall cutter, the lubricant feed channel has a bore which is introduced into the bearing plate. Advantageously, the bore extends from the circumference of the bearing plate in the direction of the axis. At the lubricant inlet opening, a connection device for a lubricant delivery device, for example a pump, may be provided. In particular, the connection device can be designed as a hose connection for connecting a lubricant hose.

The lubricant supply channel may in particular be arranged axially parallel to the drive train, which may be formed, for example, in cross-section at least partially circular, quadrangular or hexagonal. For a particularly easy access to the lubricant inlet opening, however, it may be preferred that the lubricant supply channel forms an acute angle with the drive train. This angle is preferably between 10 and 45 °, preferably between 18 and 28 °, in particular 22.5 °. In order to further improve the accessibility of the lubricant introduction opening, it is preferable provided that it is arranged below an end face of the frame.

A preferred embodiment of the invention is that the lubricant inlet opening is arranged on the circumference of the bearing plate. Such an arrangement of the lubricant introduction opening further simplifies the lubricant supply into the lubricant supply channel and thus to the sealing element. According to the invention, the circumference of the endshield can be understood to mean an outer side of the endshield which circumscribes the endshield, in particular about an axis of rotation of the at least one cutting wheel. The end shield can also be referred to as a milling blade.

A particularly reliable trench wall cutter is characterized in that the lubricating device has at least one preferably at least approximately parallel to the axis extending lubricant outlet channel, on the end and in particular above the sealing element an outlet opening for the lubricant is provided. The lubricant outlet channel is suitably in line connection with the lubricant supply channel and / or the lubricant inlet opening. Advantageously, the outlet opening is arranged in an upper region of the bearing plate above the axis. With such an arrangement, the lubricant can distribute particularly effectively during operation of the cutting wheel on the sealing element and thus ensure a particularly good lubrication. In principle, the outlet opening for the lubricant can be provided outside a sealing space, ie outside such a space, which is separated by the sealing element from the surroundings of the trench wall cutter. In this sealing space that is arranged at least one bearing. The outlet opening can also be arranged within the sealing space. If the outlet opening is outside the sealing space, this is suitably provided in an upper area of the sealing element. If, however, the outlet opening is provided inside the sealing space, this is suitably in a lower area of the sealing element arranged. The lubricant outlet channel advantageously has a bore which, for particularly short cable paths, is suitably at least approximately parallel to the axis of the endshield.

It is particularly advantageous that a step-like lubricant intermediate channel is arranged between the lubricant supply channel and the lubricant outlet channel. The lubricant intermediate channel may have a plurality of, in particular partially closed, holes which open into one another. Due to the step-like design of the intermediate lubricant channel this can be provided spaced from the drive means and / or the gear of the bearing plate. Advantageously, the intermediate lubricant channel runs in sections parallel to the lubricant supply channel and / or the lubricant outlet channel.

For supplying drive energy to the cutting wheel, for example, electrical lines, hydraulic lines and / or other pressure medium lines can be provided on the drive train. In this case, the drive motor may be provided on, in particular in the end shield. However, it is particularly preferred that a drive shaft for rotating driving of the at least one cutting wheel is provided in the drive train. In this case, the drive motor for the cutting wheels spaced from the bearing plate, in particular be provided on the cutter frame, wherein the drive shaft is used for torque transmission from the drive motor to the cutting wheel. According to this embodiment, the end plate can be made particularly compact.

For a particularly effective lubrication, the outlet opening is preferably elongate, in particular ring-segment-like or ring-shaped running along the sealing element. It can also be provided more outlet openings on the sealing element.

A particularly inexpensive and reliable trench wall cutter can be obtained by virtue of the fact that the sealing element is arranged between the bearing plate and the Fräsradnabe. According to this embodiment, the sealing element can be kept particularly small and thus inexpensive. In addition, the sealing space and the sealing surface are particularly small, which further increases the reliability of the trench wall cutter according to the invention. In principle, however, the sealing element can also be provided in the area of the cutting wheel circumference.

It is particularly advantageous that the sealing element has at least one sealing ring, which is preferably arranged coaxially to the axis. The sealing element may be formed, for example, as a lamellar seal or labyrinth seal.

The reliability of the trench wall cutter according to the invention can be further increased by the fact that the sealing element has at least two, in particular frontally opposite sealing rings, one of which is arranged on the cutting wheel and the other on the bearing plate. According to this embodiment, therefore, two corresponding sealing rings are provided, which bear against each other during operation of the trench wall cutter. In principle, however, the sealing rings can also be provided offset from one another. It can also be provided more sealing rings.

A particularly fast Fräsvortrieb can be obtained that on both sides of the bearing plate in each case a cutting wheel, in particular coaxially, is provided, each cutting wheel has its own lubrication device. Suitably, the trench wall cutter has two or four such end shields, each with two cutting wheels. Advantageously, two end shields are provided on the bottom side on the milling frame and optionally two further cutting wheels on the upper side of the milling frame. In principle, however, any number of cutting wheels can be provided. In addition to completely separate lubrication devices for the cutting wheels, the lubricating devices can also have common elements, for example a common lubricant supply channel and / or a common lubricant introduction opening.

Fig. 1

einen Längsschnitt einer erfindungsgemäßen Schlitzwandfräse;

Fig. 2

einen Längsschnitt C-C der Schlitzwandfräse aus Fig. 1;

Fig. 3

einen Längsschnitt D-D der Schlitzwandfräse aus Fig. 1;

Fig. 4

einen Längsschnitt E-E der Schlitzwandfräse aus Fig. 1; und

Fig. 5

einen Längsschnitt E-E einer weiteren Schlitzwandfräse im Detail.

The invention will be explained in more detail with reference to preferred embodiments, which are shown schematically in the figures. In the figures show:

Fig. 1

a longitudinal section of a trench wall cutter according to the invention;

Fig. 2

a longitudinal section CC of the trench wall cutter Fig. 1 ;

Fig. 3

a longitudinal section DD of the trench wall cutter Fig. 1 ;

Fig. 4

a longitudinal section EE of the trench wall cutter Fig. 1 ; and

Fig. 5

a longitudinal section EE another trench cutter in detail.

Equally acting elements are consistently indicated in all figures with the same reference numerals.

Schematic views of a trench cutter according to the invention are shown in FIG Fig. 1 to 4 shown. The trench wall cutter has a bearing plate 10, on each of which an axis 19, 19 'protrudes on both sides. At these axes 19, 19 ', which are arranged coaxially, in each case only a sectionally illustrated cutting wheel 20, 20', each with a Fräsradnabe 21, 21 'rotatably mounted.

The axes 19 and 19 'are each formed on axle elements 18, 18', which are screwed to both sides of the bearing plate 10 at this. The shell-like axle elements 18, 18 'in this case have circular ring-like and sleeve-like sections, which are connected to one another like a step. For fastening the axle elements 18, 18 'on the bearing plate 10, holes 91 are provided in the axle elements 18, 18', which correspond with bores 92 in the bearing plate 10.

At its upper end, the bearing plate 10 has a tubular drive train 12. The drive train 12 serves to supply energy for rotationally driving the cutting wheels 20, 20 '. At its upper end, the bearing plate 10 is attached to a milling frame 1 of the trench cutter shown only in sections. Inside the drive train 12 extends a drive shaft 80, which is operated by a milling frame 1 arranged on the drive motor 2, and from this torque via a arranged in the bearing plate 10 gear 25 to the cutting wheels 20, 20 'passes. Alternatively, the drive motor can also be arranged on the bearing plate 10, wherein then through the drive train 12 hydraulic lines can run to supply energy to the drive motor.

In the following, the execution of the cutting wheels 20, 20 ', their storage and the associated bearing seal and bearing lubrication will be described as an example for the cutting wheel 20. The corresponding devices for the cutting wheel 20 'are formed analogously.

For supporting the Fräsradnabe 21 of the cutting wheel 20 on the axis 19 of the bearing plate 10 has two juxtaposed bearings 31 and 32 are provided, which may for example be designed as a roller bearing. For sealing the bearings 31, 32 with respect to the surroundings of the trench wall cutter, in particular with respect to supporting liquid in the slots to be created, two sealing elements 41 and 42 designed as sealing rings are provided. The sealing element 41 is inserted into the cutting wheel hub 21 and the sealing element 42 is arranged on the bearing plate 10. The two sealing elements 41, 42 are arranged axially next to each other and abut each other for sealing.

For lubricating the two sealing elements 41, 42 a lubricating device is provided. As in particular in the embodiment of Fig. 5 can be seen, this lubricating device an outlet opening 61 for lubricant, which is provided above the two sealing elements 41, 42, ie on the side of the milling frame 1, on the bearing plate 10. The outlet opening 61 is provided outside of a sealing space formed by the sealing elements 41, 42 in the interior of the Fräsradnabe 21.

At the outlet opening 61, a lubricant outlet channel 63 connects, which runs approximately axially parallel to the axis 19 in a ring-like holding element 44, which serves to hold the sealing element 42. From there, the lubricant outlet channel, continue approximately axially parallel to the axis 19, in the axle 18th

In the axle 18, the lubricant outlet channel 63 terminates in a substantially perpendicular to the axis 19 extending channel 72. This vertically extending channel 72 is formed by a sealed to the outside with a closure 75 hole in the axle 18.

The channel 72 in turn opens into a substantially axially parallel to the axis 19 extending channel 71 a. The horizontally extending channel 71 is provided both in the axle 18 and in the milling blade 10. The channels 71, 72 together may also be referred to as lubricant intermediate channel 70. The two channels 71, 72 form in the interior of the axle 18, above the transmission 25, a stepped arrangement.

The channel 71, in turn, opens into a Schmiermittelzuführkanal 53, which extends in the interior of the bearing plate 10 upwards. The Schmiermittelzuführkanal 53 extends along the drive train 12 along and closes with this drive train 12 an angle α of 22.5 °. At the upper end of the drive train 12, the lubricant supply passage 53 terminates in a lubricant introduction port 51, to which, for example, a hose connection may be provided. The lubricant introduction opening 51 is on the outside of the trench wall cutter, below the cutter frame 1 on the circumference 9 of the milling blade 10, that is arranged on the circumferential outer surface.

The channels 53, 71, 72, 63 are used to supply lubricant to the two sealing elements 41, 42. The lubricant can be introduced in the region of the milling frame 1 in the lubricant inlet 51 and is through the channels 53, 71, 72, 61 to the sealing elements 41, 42 passed. The lubricant introduction opening 51 is provided in one of the cutting wheels 20, 20 'spaced area above the milling blade 10, so that the cutting wheels 20, 20' need not be dismantled for the supply of lubricant.

The cutting wheel 20 of Fig. 5 has a cylinder jacket-like shell portion 28, on the circumferential side milling and mixing teeth 29 are arranged for processing and mixing of pending soil material. The jacket section 28 runs coaxially with the cutting wheel hub 19 and radially covers the sealing elements 41, 42 towards the surroundings of the trench wall cutter. The cutting wheel 20 'is formed in an analogous manner.

Claims (9)

1. Trench wall cutter comprising

   - a cutting frame (1),

   - at least one bearing shield (10) arranged on the cutting frame (1),

   - at least one axis (19, 19') arranged on the bearing shield (10),

   - at least one cutting wheel (20, 20') having a cutting wheel hub (21, 21'), which is supported on the axis (19, 19') in a rotatable manner by means of at least one bearing (31, 32),

   - a driving device to drive the at least one cutting wheel (20, 20') in a rotating manner,

   - a drive train (12) arranged at the top of the bearing shield (10) and

   - at least one sealing member (41, 42) arranged between the bearing shield (10) and the cutting wheel (20, 20') to seal the bearing (31, 32) against the area surrounding the trench wall cutter,

   characterized in that

   - at least one lubricating device is provided for feeding lubricant to the sealing member (41, 42), and

   - in that the lubricating device has a lubricant inlet port (51) arranged above the cutting wheel (20, 20'), and

   - in that the lubricating device has at least one lubricant feeding channel (53), at whose end the lubricant inlet port (51) is arranged, the lubricant feeding channel (53) extending at least in portions along the drive train (12) in the bearing shield (10).
2. Trench wall cutter according to claim 1,
   characterized in that
   the lubricant feeding channel (53) includes an acute angle (α) with the drive train (12).
3. Trench wall cutter according to claim 1 or 2,
   characterized in that
   the lubricant inlet port is arranged at the circumference (9) of the bearing shield, below a front face of the cutting frame (1).
4. Trench wall cutter according to claim 1 or 3,
   characterized in that
   the lubricating device has at least one lubricant outlet channel (63), which preferably extends at least approximately parallel to the axis (19, 19') and at whose end an outlet port (61) for the lubricant is provided in particular above the sealing member (41, 42).
5. Trench wall cutter according to claim 4,
   characterized in that
   between the lubricant feeding channel (53) and the lubricant outlet channel (63) a step-shaped lubricant intermediate channel (70) is arranged.
6. Trench wall cutter according to any one of claims 1 to 5,
   characterized in that
   the sealing member (41, 42) is arranged between the bearing shield (10) and the cutting wheel hub (21, 21').
7. Trench wall cutter according to any one of claims 1 to 6,
   characterized in that
   the sealing member (41, 42) has at least one sealing ring, which is preferably arranged coaxially to the axis (19, 19').
8. Trench wall cutter according to any one of claims 1 to 7,
   characterized in that
   the sealing member (41, 42) has at least two sealing rings, in particular disposed opposite each other at the front face, one of which is arranged on the cutting wheel (20, 20') and the other is arranged on the bearing shield (10).
9. Trench wall cutter according to any one of claims 1 to 8,
   characterized in that
   on both sides of the bearing shield (10) a cutting wheel (20, 20') is each provided in particular in a coaxial manner, with each cutting wheel (20, 20') having its own lubricating device.

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