CN115485436A

CN115485436A - Slot wall milling machine

Info

Publication number: CN115485436A
Application number: CN202180031702.4A
Authority: CN
Inventors: C·施罗佩尔
Original assignee: Bauer Spezialtiefbau GmbH
Current assignee: Bauer Spezialtiefbau GmbH
Priority date: 2020-04-29
Filing date: 2021-03-04
Publication date: 2022-12-16
Also published as: EP3904603B1; EP3904603C0; EP3904603A1; WO2021219279A1; US20230175230A1

Abstract

A slot wall milling machine having: a pair of milling wheels (12); a support end shield (14) at which a pair of milling wheels (12) are rotatably arranged on both sides of the support end shield; a base frame (30) at the underside of which at least one supporting end shield (14) is mounted; and a milling wheel drive (20) for driving the milling wheel (12) via a transmission lubricated with transmission oil in the bearing end shield. According to the invention, at least one heat exchanger (60) is arranged above the bearing end shield (14), and an oil circuit (50) is formed for cooling the transmission oil, to which the at least one heat exchanger (60) above the bearing end shield (14) is connected.

Description

Slot wall milling machine

Technical Field

The invention relates to a groove wall milling machine (or referred to as a groove wall cutter, schlitzwanfr 228se) according to the preamble of claim 1, having: at least one pair of milling wheels; at least one supporting end shield (also known as a lagerstill) at which a pair of milling wheels are rotatably arranged on either side of the supporting end shield; a base frame at the underside of which at least one support end shield is mounted; and a milling wheel drive for driving the milling wheel via a transmission oil-lubricated in the bearing end shield.

Background

A slot wall milling machine of this type is known from EP 1 637 794 B1. In the slot wall milling machine, an oil circuit (214lkreisolauf) is arranged between a milling wheel arranged at the lower end of the bearing end shield and a frame housing with a milling wheel drive. The oil is conveyed by means of the drive shaft from the milling wheel up through the milling end shield to the milling wheel drive in the housing. The oil return takes place via a return line in the bearing end shield. In operation, the bearing end shield is covered on both sides by the mill wheel and is hardly able to flow around by the supporting sludge (or called supporting suspension, stuetz suspension).

Another groove wall milling machine of this type is known from EP 1 580 327 B1. In this slot wall milling machine, the drive torque of the individual drive motors is transmitted via a central drive shaft in the bearing end shield to the sun wheel, from which the torque is distributed to the individual milling wheel pairs.

Disclosure of Invention

The object of the invention is to specify a pocket wall milling machine in which a particularly high milling output can be ensured with reliable lubrication of the transmission components for driving the milling wheel.

According to the invention, this object is achieved by a groove wall milling machine having the features of claim 1. Preferred embodiments of the invention are specified in the dependent claims.

The slot wall milling machine according to the invention is characterized in that at least one heat exchanger is arranged above the bearing end shield, and an oil circuit is formed for cooling the transmission oil, to which oil circuit the at least one heat exchanger above the bearing end shield is connected.

The basic idea of the invention is based on the knowledge that the transmission components in a groove wall milling machine are subjected to considerable forces, in particular during the through-milling of hard soil or rock layers, by means of which strong heating of the transmission oil can be produced. Excessive heating of the transmission oil can cause the lubrication film of the gears that are in contact with each other to break and cause increased wear at the gears and bearings. This can limit the milling output and shorten the service life of the transmission.

In order to overcome this problem, according to the invention, an oil circuit having at least one heat exchanger is provided, through which the transmission oil is conducted. The heat exchanger is arranged here remote from the milling point and the bearing end shield with the gear, i.e. above the bearing end shield. The oil circuit may be formed by means of an oil line.

In this way, according to the invention, targeted cooling takes place at the exposed regions of the housing above the milling wheel and above the bearing end shield in the liquid-filled milling groove. This region offers the possibility of a very large-area wall construction of the preferably plate-shaped heat exchanger at or even above the base frame. A plurality of heat exchangers may also be arranged. In this way, even in the event of intense heating of the transmission oil in the oil circuit, cooling to the desired operating temperature is possible, so that the oil has the desired viscosity for the formation of a stable lubricating film during operation. In this way, particularly high milling powers can be achieved.

A preferred embodiment of the invention provides that the heat exchanger is designed as a plate which is releasably fastened to the base frame or to a holding device above the base frame. The heat exchanger can thus be mounted at the struts of the base frame or at the holding device from which the base frame is suspended. The holding device may be a guide rod, a holding cable and/or a supply line.

According to a development of the invention, it is advantageous if the milling drive is arranged in the housing and the heat exchanger is formed in or at an outer wall of the housing. In compact milling machines without guide plates, such as CSM milling machines, the basic frame is essentially formed by the housing of the milling wheel drive. The heat exchanger can be designed in a compact manner on the housing.

It is advantageous here if the outer wall of the housing is designed as a cooling wall, wherein at least one recess is introduced on the inside of the cooling wall for forming the oil guide channel, in which recess a hose-like or tubular line is arranged. At least one outer wall of the housing can be designed as a cooling wall, in which at least one oil conducting channel is arranged, wherein the oil used for cooling can be conducted through the at least one oil conducting channel in the outer wall of the housing.

A preferred embodiment of the invention is, in particular, that the oil guide channel is designed in the outer wall of the housing in a loop-shaped, preferably meandering manner. Thereby, a particularly intensive and rapid cooling of the oil in the cooling wall can be achieved.

The heat exchanger is in particular designed as a releasably fixed, separate plate. Thus, it is also possible to retrofit or change an existing slot wall milling machine. The plate may be two-piece, wherein the cover plate covers the oil guide channel in the base plate. The cooling plate can also be attached, in particular screwed, to a smooth-surfaced housing wall.

According to a development of the invention, a particularly suitable embodiment is achieved in that, for forming the oil duct channel, at least one recess is introduced on the inside of the cooling wall, in which recess a hose-like or tubular line is arranged. The groove can accordingly run back in a ring or in a meandering manner. In principle, it is also possible to design the groove directly as an oil guide channel by means of a corresponding seal. The use of a hose-like or tubular line, which may be composed of metal (preferably stainless steel) or plastic, results in a particularly simple design with high tightness.

In the slot wall milling machine according to the invention, particularly good cooling can be achieved in that the plate-shaped heat exchanger comprises a metal with high thermal conductivity, in particular aluminum or an aluminum alloy. In particular, metals are provided which have a higher thermal conductivity than steel. A particularly strong cooling effect can thereby be achieved. Thus in the tests, a cooling power of about 3.2kW was obtained in the case of using the steel plate, and a cooling power of about 11.2kW was achieved in the case of using the aluminum plate.

A further preferred embodiment of the invention provides that at least one pump device is provided, by means of which oil can be conveyed in the oil circuit. The pump device can be an electrically or hydraulically driven pump, preferably with a variable delivery volume. In particular, the pump device can be driven by a control device, which varies the delivery flow rate through the oil guide channel as a function of the current oil temperature (which can be detected, for example, by a temperature sensor). Thus, heat dissipation can be performed as required.

A particularly simple embodiment of the groove wall milling machine according to the invention is achieved in that the pump device comprises a shaft driven by the milling drive, which shaft is provided at its outer side with at least one conveying screw (Foerderwendel) for forming a worm pump. The shaft of the pump device can be driven in rotation by the mill wheel drive via a separate drive train.

According to one embodiment variant of the invention, it is particularly advantageous if the shaft is a drive shaft which extends from the mill wheel drive via the bearing end shield to the mill wheel. The drive shaft extends substantially vertically here and is provided at its outer side with a conveying helix, in particular a groove (Rillung), through which oil is conveyed in the shaft channel along the shaft from the milling wheel upwards. This allows the oil supply from the milling wheel to the milling wheel drive to be adjusted without great complexity. The mill wheel drive preferably comprises one or more hydraulic motors.

In order to control the oil flow in a targeted manner, it can be advantageous according to a development of the invention to provide a control valve which blocks the oil supply channel at a first, lower temperature and releases the oil supply channel at a second, higher temperature. The control valve can be operated by the control already mentioned above as a function of the oil temperature. In particular, when the mill wheel drive is started with a low transmission oil temperature, the oil line passage is blocked, so that the transmission oil heats up to the operating temperature as quickly as possible. When a second, higher temperature is exceeded, the control valve can then open and release the oil conducting channel. Thus, the oil can flow into the heat exchanger through the oil guide channel, so that a corresponding cooling can be obtained.

In principle, the at least one cooling wall can be arranged at any point at the outside of the housing or the milling frame. According to one embodiment of the invention, it is particularly advantageous to provide at least two cooling walls, which are arranged at the longitudinal sides of the housing. This makes it possible to sufficiently cool the heat exchanger even in the case of particularly intense heating. The housing may be designed as a grid frame, at or in which one or more cooling plates are arranged.

Drawings

The invention will be further described below on the basis of preferred embodiments, which are schematically shown in the drawings. Wherein:

FIG. 1 shows a front view of a groove wall milling machine according to the invention;

FIG. 2 shows a schematic illustration in partial section of the course of an oil guide channel in the groove wall milling machine of FIG. 1;

FIG. 3 shows an enlarged partial cross-sectional view through a stave used in the present invention; and

fig. 4 shows a schematic view of a part of an oil circuit in a groove wall milling machine according to the invention.

Detailed Description

The slot wall milling machine 10 according to the invention according to fig. 1 has a base frame 30 with a housing 31, at the underside of which two plate-like support end caps 14 are mounted. At the bearing end shield 14, a milling wheel 12 having a plurality of milling teeth 13 is rotatably mounted on both sides for milling away soil material. Furthermore, at the lower side of the base frame 30, a wedge-shaped slurry supply 16 may be arranged between the two pairs of milling wheels 12. During a milling operation, a supporting slurry and a milling slurry can be introduced into the milling flutes formed via the slurry supply 16. The supplied slurry may be provided with a binder, wherein by mixing with milled soil particles (Bodenklein) a so-called soil cement may be formed, which may harden in the milled grooves to form the groove wall sections.

Along the narrow sides of the base frame 30, plate-like adjusting and guiding elements 18 are arranged. In a milling operation, these adjusting and guiding elements can abut against the walls of the milling groove, wherein the groove wall milling machine 10 can be guided and adjusted in the milling groove by adjusting the adjusting elements 18 accordingly. At the upper side of the housing 31 of the base frame 30, cable suspension devices or guide rods are provided in a known manner for holding and vertically adjusting the slot wall milling machine 10 in the milling slot.

To form the heat exchanger 60, a plate-like outer wall 32 is provided on one or preferably both longitudinal sides of the box-shaped base frame 30, which outer wall is designed as a cooling wall 34 shown in more detail in fig. 2 and 3. The stave 34 may form a wall of the housing 31.

According to fig. 3, the heat exchanger 60 with the cooling wall 34 is embodied as a flat plate, preferably made of stainless steel. The cooling wall 34 has an inner side 35 directed toward the housing 31 and an opposite outer side 37, which in the assembled state forms the outer side of the housing 31. Along the inner side 35 of the cooling wall 34, grooves 38 are milled, which are formed in a meandering manner according to the illustration in fig. 2. A line 40 of metal tubing (e.g., copper) extends into the annular groove 38. The line 40 thus forms the oil guide channel 36 in the stave 34. The line 40 has at both ends thereof couplings 42 with which a heat exchanger 60 can be coupled to an oil circuit 50, which is partially schematically shown in fig. 4.

According to the strongly schematic illustration of fig. 4, a partly represented milling wheel drive 20 with a number of bearings is shown. For each support end shield 14, a drive shaft 22, only partially shown, extends downwardly from the mill wheel drive 20 to the underlying mill wheel 12. The drive shaft 22 is provided at its outer side with not shown conveying channels which can convey transmission oil from the region of the milling wheel 12 upwards in the direction of the milling wheel drive 20. The oil flows here through the bearings and gear assemblies of the milling wheel drive 20, which are only schematically represented. The mill wheel drive 20 can preferably comprise at least one hydraulic motor and a driven and distribution gear.

Via a not shown pump arrangement, at least a part of the transmission oil is led via a supply (Vorlauf) 44 of the oil circuit 50 to the upper coupling of the heat exchanger 60 with the meandering oil guiding channel 36 in the cooling wall 34. The heated oil can flow through the serpentine oil guide channel 36 from top to bottom in the cooling wall 34 and in this case dissipate the heat to the cooling wall 34, the free outer side of which is directed toward the trough filled with sludge. The oil guide channel 36 can be formed with a slight gradient of, for example, approximately 15 ° in the cooling wall 34, so that the oil flow can be regulated without great pressure expenditure.

The cooled transmission oil is conducted back to the mill wheel drive 20 via the return 46 of the oil circuit 50. Via the return line 52, the transmission oil can be conducted from the mill wheel drive 20 down to the mill wheel with the distribution transmission. The oil reheated in particular in the region of the distribution gear can then be conducted back up to the mill wheel drive 20 and the heat exchanger 60 above the bearing end shield 14 by the conveying action of the drive shaft 22. In order to control the oil flow through the oil guide channel 36, a control valve 28 is provided at the supply 44 or, as shown, at the return 46. The control valve may control the flow of oil through the oil guide passage 36 at a set temperature and generally block or completely open the flow of oil. This control is effected in dependence on a temperature sensor, not shown, which measures the temperature of the transmission oil at one or more points in the oil circuit 50. The cooling circuit may also have a branching for pressure balancing the transmission assembly.

Claims

1. A slot wall milling machine has

-at least one pair of milling wheels (12),

-at least one supporting end shield (14) at which a pair of milling wheels (12) is rotatably arranged on both sides of the supporting end shield (14),

-a base frame (30) at the lower side of which the at least one supporting end shield (14) is mounted, and

-a mill wheel drive (20) for driving the mill wheel (12) via a transmission in the bearing end shield (14) lubricated with a transmission oil,

it is characterized in that the preparation method is characterized in that,

-at least one heat exchanger (60) is arranged above the supporting end shield (14), and

-for cooling the transmission oil, an oil circuit (50) is configured, at which the at least one heat exchanger (60) above the support end shield (14) is coupled.

2. The slot wall milling machine according to claim 1, characterized in that the heat exchanger (60) is configured as a plate which is releasably fixed at the base frame (30) or at a holding device above the base frame (30).

3. The groove wall milling machine according to claim 1 or 2, characterized in that the milling wheel drive (20) is arranged in a housing (31) and the heat exchanger (60) is arranged in or at an outer wall (32) of the housing (30).

4. The groove wall milling machine according to claim 3, characterized in that the outer wall (32) of the housing (31) is configured as a cooling wall (34), wherein, in order to form an oil guide channel (36), at least one groove (38) is introduced at the inner side of the cooling wall (34), in which groove a hose-like or tubular line (40) is arranged.

5. The groove wall milling machine according to any one of claims 1 to 4, characterized in that the plate-shaped heat exchanger (60) comprises a metal with high thermal conductivity, in particular aluminum or an aluminum alloy.

6. The groove wall milling machine according to any one of claims 1 to 5, characterized in that at least one pump device is provided, by means of which the oil can be transported in the oil circuit (50).

7. The groove wall milling machine according to claim 6, characterized in that the pump arrangement comprises a shaft driven by the mill wheel drive (20), which shaft is provided at its outer side with at least one conveying screw.

8. The groove wall milling machine according to claim 7, characterized in that the shaft is a drive shaft (22) extending from the milling wheel drive (20) through the bearing end shield (14) to the milling wheel (12).

9. The groove wall milling machine according to any one of claims 1 to 8, characterized in that a control valve (28) is provided which blocks the oil guiding channel (36) of the oil circuit (50) to the heat exchanger (60) in the case of a lower first temperature and releases the oil guiding channel (36) in the case of a higher second temperature.

10. The groove wall milling machine according to any one of claims 1 to 9, characterized in that at least two cooling walls (34) are provided, which are arranged at a longitudinal side of the housing (30).