EP3333319B1 - Actuation unit for locking a component of a construction machine and construction machine with such an actuation unit - Google Patents

Description

The invention relates to an actuating unit for locking a component of a construction machine, in particular road milling machine or surface miner, wherein the actuating unit has a holding part for fastening the actuating unit to the construction machine. Moreover, the invention relates to a self-propelled construction machine, in particular road milling machine or surface miner, with at least one such actuator unit.

The known construction machines have a plurality of assemblies, each having a plurality of components. For the arrangement of all components is on the construction machine only a limited space available. Therefore, in principle, the aim is to arrange components of a construction machine close to each other.

The assemblies of the known construction machines also include components that are mutually movable. For certain tasks of the construction machine, it is often required that a movable member can be engaged with another stationary member, so that the movable member is locked. For locking movable components, a variety of locking devices are known. A simple and secure locking allows, for example, the use of a locking bolt. The locking bolt can be inserted by hand. Locking devices are also known which have an actuating unit having a piston / cylinder arrangement for moving the locking bolt. In these actuators, the piston of the piston / cylinder assembly is connected to the locking bolt in a linear arrangement so that the piston can actuate the locking bolt. This arrangement of piston / cylinder arrangement and locking bolt results in that the actuating unit has relatively large dimensions in the longitudinal direction.

An object of the invention is to provide a universally applicable actuator unit for locking a component of a construction machine, in particular road milling machine or surface miner, on the one hand allows a simple and secure locking a component of the construction machine and on the other hand between other components of the construction machine even in tight spaces can be installed.

The known road milling machines or surface miners have a machine frame carried by drives and a milling drum for working the floor, which is arranged in a milling drum housing, which is closed in the working direction behind the milling drum by a scraper blade. In the working direction in front of the milling drum, the milling drum housing is closed by a hold-down. On both sides of the milling drum edge protection can be provided.

The scraper blade of the known road milling machines or surface miners extending transversely to the working direction can be arranged in a substantially vertical plane between a lowered position in which the scraper blade rests with its lower edge on the ground or directly above the ground, and a raised position to be moved. The scraper blade can also be pivoted generally about a pivot axis which is parallel to the Fräswalzenachse so that the milling drum is accessible for inspection and maintenance purposes.

The DE 35 28 038 A1 describes a road milling machine with a scraper blade, which is also referred to as a material collecting flap. The operation of the scraper blade is carried out with a piston-cylinder assembly in conjunction with a slotted guide, which initially allows a lifting movement of the scraper blade in a vertical plane and then a pivoting movement. The disadvantage is that the piston-cylinder arrangement, which is intended to enable not only a lifting movement, but also a pivoting movement of the scraper blade, has a relatively large length in order to perform both movements in succession.

The EP 0 685 598 A1 ( US 5,474,397 A ) describes a road milling machine with a scraper blade, which is actuated by an actuating device which has several Piston-cylinder arrangements features. For the transition of the lifting movement in the pivoting movement of the scraper blade is locked. For this purpose, locking devices are provided which have a Verrieglungsbolzen which is guided longitudinally displaceably in a cylindrical bore of a housing. For actuating the Verrieglungsbolzens a pin is provided, which is connected to the Verrieglungsbolzen. The piston-cylinder assemblies have again in this milling machine again a relatively large length in order to perform the lifting and pivoting movement sequentially. In addition, the manual operation of the pin for locking or unlocking the scraper blade on larger machines is no longer practicable, as would be required to adjust the pin in the appropriate dimensioning of the components to large forces.

DE 28 33 533 A1 describes a compressed air cylinder which has an axially displaceable operating part 5. The compressed air cylinder has an end closed cylinder 1, in which a piston 3 is arranged. Between the ends of the cylinder 1 extends a slot 2 through which the actuating part 5 extends, which is connected to the piston. When the cylinder chambers are pressurized to both sides of the piston 3 with compressed air, the piston moves to one of the two sides, whereby the operating member 5 moves in the slot 2.

From the US 8 100 480 B2 ( DE 10 2007 038 677 A1 ) is a road milling machine, in which the scraper blade is formed in two parts. The two-part scraper blade has a lower and upper scraper, wherein in the operating position, the upper stripping element fixed and the lower stripping element is adjustable in height. The upper and lower scraper elements can also be pivoted together. Such a function requires a locking of one of the two stripping elements, which takes place by means of sliding blocks, which are guided in a slotted guide. The pivoting movement of the scraper blade can only be made if the sliding blocks are out of engagement with the slotted guide. The movement of the lower and upper scraper again takes place with piston / cylinder assemblies, which have a relatively large length.

The DE 10 2014 011856 A1 describes a self-propelled construction machine having a machine frame carried by drives and a milling drum for working the floor, which is arranged in a Fräswalzengehäuse, which is closed in the working direction behind the milling drum of a scraper blade.

From the EP 2 636 794 A1 is a self-propelled construction machine known that means a Piston / cylinder units has adjustable scraper blade. The scraper can be pivoted upwards so that the tools of the milling drum are accessible.

In road milling machines or surface miners should remain between the guides of the scraper blade or the piston / cylinder assemblies for a possible material outlet in the Abstreifschild the largest possible distance across the direction. The guides or piston / cylinder arrangements of the scraper blade should also be as far apart as possible in order to avoid tilting of the scraper blade when lifting or lowering. This arrangement has the consequence that only a relatively small space remains between the side parts of the milling drum housing and the guides or piston / cylinder arrangements.

Another object of the invention is to provide a self-propelled construction machine, in particular road milling machine or surface miner, with a two-part scraper blade, which allows a reliable working height adjustment. The invention is in particular the object to solve the problem of locking one of the two stripping elements even in tight spaces.

The solution of these objects is achieved according to the invention with the features of claim 1. The dependent claims relate to preferred embodiments of the invention.

The basic principle of the actuating unit according to the invention lies in the design of the cylinder of a piston / cylinder arrangement as a "locking pin".

The actuating unit according to the invention for locking a component of a construction machine, in particular road milling machine or surface miner, has a holding part for attachment to the construction machine. The holding part can be designed differently. In the holding part, it is only important that a secure attachment to a component of the construction machine is guaranteed. The holding part can also consist of several individual parts. The attachment of the holding part to a component of the construction machine need only serve to secure the position of the operating unit, d. H. do not absorb large forces or torques, in particular not the forces or torques that may occur due to the locking of the component.

In the actuating unit according to the invention a piston is connected to the holding part, which is enclosed by a cylinder around the entire circumference to form a first cylinder space on one side of the piston and a second cylinder space on the other side of the piston. The piston may be an integral part of the holding part. Holding part, piston or cylinder can also each consist of several individual parts. A preferred embodiment provides that the holding part has an elongated body or is formed as an elongated body whose longitudinal axis perpendicular to the longitudinal axis of the cylinder. The holding part is in a particularly preferred embodiment, a rod, in particular a cylindrical rod, which can be securely fastened with a suitable holder which may be provided on a component of the construction machine. For example, the rod can be fixed in the holder by clamping. But it is also possible to weld the rod with a component of the construction machine. Also, an attachment by positive locking is possible.

In contrast to a conventional piston-cylinder arrangement, the "piston" in the actuating unit according to the invention is not a movable in a fixed cylinder member, because not the cylinder, but the piston is connected via the holding part with a stationary component on the construction machine.

The cylinder forms together with the piston on one side of the piston a first cylinder space and on the other side of the piston a second cylinder space, wherein the first cylinder space is in fluid communication with a first fluid port and is in fluid communication with the second cylinder space, a second fluid port. In the cylindrical wall of the cylinder extending in the direction of the longitudinal axis of the cylinder recess is provided, through which extends the holding part. The holding part may be guided in the longitudinally extending recess, so that the cylinder can not rotate relative to the holding part.

When one of the two cylinder chambers is subjected to a fluid, for example hydraulic fluid or compressed air, the cylinder moves to one side or the other, while the holding part is stationary. Consequently, the cylinder constitutes a "locking pin" which can be advanced or retracted. The means for actuating the "locking bolt" are virtually part of the bolt.

Since the actuating unit is a "piston / cylinder arrangement" in a broader sense, the relevant components are referred to as pistons and cylinders. However, the "piston" connected to the stationary holding part is immovable and the cylinder "is movable with respect to the stationary holding part." A cylinder is also understood to mean a body which, although a cylindrical bore for having the piston, but the outer peripheral surface is not cylindrical over the entire length. It is advantageous, however, if the cylinder is designed as a cylindrical securing bolt.

Since the cylinder has a relatively large outer diameter compared to the piston, the "locking bolt" can absorb relatively large forces. The wall thickness of the cylinder can be dimensioned accordingly.

The fluid connections can in principle be provided on the cylinder or the piston. However, it is advantageous if the first and second fluid connection are provided on the piston, wherein the first and second fluid connection extend through the recess of the cylindrical wall of the cylinder, since the connections then do not move during locking and unlocking. In addition, a particularly compact design is achieved with this arrangement. As fluid connections, the known connections for fluid lines, in particular hydraulic or compressed air lines, can be used, to which hydraulic or compressed air lines can be connected.

A preferred embodiment provides that the first fluid port is arranged on the piston on one side of the holding part and the second fluid port on the piston on the other side of the holding part, wherein on the one side of the holding part in the piston one of the first fluid port to the first cylinder chamber leading first fluid channel and on the other side of the holding part in which a piston from the second fluid port to the second cylinder chamber leading second fluid channel is formed. This results in a symmetrical arrangement in which the fluid can be supplied centrally.

In another preferred embodiment, the cylinder has an outer cylinder part and at least one inner cylinder part which is inserted into the outer cylinder part on one side, and at least one inner cylinder part which is inserted into the outer cylinder part on the other side. The recess for the holding part is in this embodiment in the cylindrical wall of the outer cylinder part between the at least one inner cylinder part on one side of the outer cylinder part and the at least one inner cylinder part provided on the other side of the outer cylinder part. In this case, the one end of the piston may be guided in the at least one inner cylinder part on one side of the outer cylinder part and the other end of the piston in the at least one inner cylinder part on the other side of the outer cylinder part. The middle portion of the piston may be guided in the outer cylinder part. The use of inserts offers manufacturing advantages in that the inserts can be processed easily. For example, the insert parts can be easily provided with grooves for sealing packages without great manufacturing effort.

The actuating unit according to the invention can be used universally. A particularly preferred use of the actuating unit is the use in a self-propelled construction machine, in particular road milling machine or surface miner.

The construction machine may have one or more of the actuating units according to the invention, wherein in each case two arbitrary components, which are connected to each other movable relative to each other, at least one operating unit can be assigned to bring the two components into engagement. If one of the two components is movable and the other immovable, d. H. is stationary, the movable member can be locked.

In a preferred embodiment of the construction machine, a recess for receiving the cylinder of the actuating unit is provided on one of the two movably interconnected components, wherein the holding part of the actuating unit is fastened to the other component in such a way that the cylinder acts on the first or second cylinder space is advanced with a fluid into the recess, so that the two components are engaged with each other. When the second or first cylinder chamber is acted upon by a fluid, the cylinder is withdrawn from the recess, so that the two components are disengaged.

On the component of the construction machine, on which the holding part of the actuating unit is to be fastened, a holder for fastening the holding part is preferably provided, then that the assembly is simplified. However, the holding part can also be screwed, plugged (positive connection) or welded, for example. The attachment of the holding part may be a clamping fixation.

A further preferred embodiment provides that on the component of the construction machine, to which the holding part is to be attached, at least one support member is provided with a recess in which the cylinder or in which the cylinder is displaceable. This ensures that the forces or torques occurring during the locking are not absorbed solely by the holding part or its holder, but are essentially absorbed by the "locking bolt". Preferably, the cylinder is slidably guided in the recess of the at least one support member so that forces or torques are received in both the locked and the unlocked position of the at least one support member. The at least one support member can thus receive not only the forces or torques occurring during the locking, but also the weight of the actuating unit. The holding part itself or its holder can thus be dimensioned correspondingly light. This then serves only to secure the position.

The advantages of the actuating unit according to the invention come in particular in the locking of one of the two stripping elements of a two-part scraper blade of a construction machine, in particular milling machine or surface miner to bear. The construction machine according to the invention with the actuating unit is characterized in that the scraper blade can be operated easily and safely. The operating unit can be mounted easily even in confined spaces.

The scraper blade of the construction machine according to the invention has an upper stripping element which is pivotally mounted on a component of the machine frame or Fräswalzengehäuses about a parallel to the Fräswalzenachse pivot axis, and has a lower stripping element, with respect to the upper stripping between a lowered position on the ground and a raised Position is displaced.

The construction machine may comprise one or more of the actuation units according to the invention. The recess for receiving the cylinder of the at least one actuating unit is provided on a component of the machine frame or Fräswalzengehäuses, and the holding part of the actuating unit is attached to the upper scraper element such that the cylinder in a loading of the first and second cylinder chamber with a fluid in the Recess is advanced, so that the upper stripping element is locked, and the cylinder is retracted with an act of the second and first cylinder chamber with a fluid from the recess, so that the upper stripping element is unlocked.

For the operation of the scraper blade an actuating device is provided, which is designed such that when the upper stripping element is locked, the lower stripping between the lowered and raised position is displaceable and unlocked upper stripping the lower and upper stripping about the pivot axis from the operating position in a raised Position are pivotable.

The wiper blade actuator may have multiple piston / cylinder arrangements. In a preferred embodiment, the actuating device has a first piston / cylinder arrangement and a second piston / cylinder arrangement, which are arranged at a distance from one another on the scraper blade. A first operating unit is disposed in an area between the first piston / cylinder arrangement and a side part of the machine frame or milling drum housing, and a second operating unit is arranged in a region between the second piston / cylinder arrangement and a side part of the machine frame. The recess for receiving the cylinder of the actuating unit is provided in the side part of the machine frame or Fräswalzengehäuses.

The kinematics are designed such that the two-part scraper blade can be both lifted and pivoted with only a pair of piston / cylinder assemblies. Instead of two piston / cylinder arrangements, however, only one piston / cylinder arrangement or more than two piston / cylinder arrangements can be provided in order to carry out both movements. But it is also possible to and pivoting movement separate from each other with one or more piston / cylinder assemblies.

A further preferred embodiment provides that the cylinders of the first and second piston / cylinder arrangement are pivotable on a component of the machine frame or milling drum housing about an axis extending parallel to the pivot axis of the scraper blade and the pistons of the first and second piston / cylinder arrangement are secured in the region of the lower portion of the lower stripping element. Preferably, the first and second actuating unit are arranged in the region of the lower portion of the upper scraper element.

Hereinafter, an embodiment of the invention will be described in detail with reference to the drawings.

Fig. 1

eine Straßenfräsmaschine in der Seitenansicht als Beispiel für eine selbstfahrende Baumaschine,

Fig. 2

ein zweiteiliges Abstreifschild einer Baumaschine zusammen mit einer Betätigungseinrichtung für das Abstreifschild sowie Teile des Fräswalzengehäuses und die Fräswalze in perspektivischer Darstellung, wobei sich das untere Abstreifelement in einer abgesenkten Position befindet,

Fig. 3

das Abstreifschild von Fig. 2, wobei sich das untere Abstreifelement in einer angehobenen Position befindet,

Fig. 4

das Abstreifschild von Fig. 2, wobei sich das untere und obere Abstreifelement in einer unteren Schwenkposition befindet,

Fig. 5

das Abstreifschild von Fig. 2, wobei sich das untere und obere Abstreifelement in einer oberen Schwenkposition befindet,

Fig. 6

eine Seitenansicht des Abstreifschildes zusammen mit der Betätigungseinrichtung und Teilen des Fräswalzengehäuses,

Fig. 7

einen Teilschnitt entlang der Linie A-A von Fig. 6,

Fig. 8

eine Draufsicht auf das Abstreifschild von Fig. 6,

Fig. 9

ein erstes Ausführungsbeispiel der erfindungsgemäßen Betätigungseinheit und

Fig. 10

ein zweites Ausführungsbeispiel der erfindungsgemäßen Betätigungseinheit.

Show it:

Fig. 1

a road milling machine in the side view as an example of a self-propelled construction machine,

Fig. 2

a two-part scraper blade of a construction machine together with an actuating device for the scraper blade and parts of the milling drum housing and the milling drum in a perspective view, wherein the lower scraper element is in a lowered position,

Fig. 3

the scraper shield of Fig. 2 with the lower scraper element in a raised position,

Fig. 4

the scraper shield of Fig. 2 , wherein the lower and upper scraper element is in a lower pivot position,

Fig. 5

the scraper shield of Fig. 2 , wherein the lower and upper scraper element is in an upper pivot position,

Fig. 6

a side view of the Abstreifschildes together with the actuator and parts of the Fräswalzengehäuses,

Fig. 7

a partial section along the line AA of Fig. 6 .

Fig. 8

a plan view of the scraper of Fig. 6 .

Fig. 9

a first embodiment of the actuator unit according to the invention and

Fig. 10

A second embodiment of the actuator unit according to the invention.

Fig. 1 shows as an example of a self-propelled construction machine, a road milling machine for milling road surfaces made of asphalt, concrete or the like. The road milling machine has a machine frame 2 carried by a chassis 1. The chassis 1 comprises front and rear drives 1A, 1B, which are arranged on the right and left sides of the machine frame 2 in the working direction A. The drives 1A, 1B are mounted on lifting columns 3A, 3B mounted on the machine frame 2 so that the machine frame 2 is adjustable with respect to the ground Bin of height.

The road milling machine has a milling drum 4, which is equipped with milling tools, not shown. The milling drum 4 is arranged on the machine frame 2 between the front and rear drives 1A, 1B in a milling drum housing 5. The axis of rotation 6 of the milling drum 4 extends transversely to the working direction A of the milling machine. The Fräswalzengehäuse 5 is at the front in the working direction A side of a in Fig. 1 not shown down and at the back of a in Fig. 1 Not Shield shown closed, which is also referred to as a scraper. On the longitudinal sides of the roller housing is closed by an edge protection 7. The milled milled material can be removed with a transport device 8. Above the Fräswalzengehäuses 5 is located on the machine frame 2, the control station. 9

Hereinafter, the two-piece scraper blade and the actuator for the scraper blade of the construction machine according to the invention with reference to the FIGS. 2 to 8 described, the stripping plate 10 together with the actuator and parts of the Fräswalzengehäuses 2 and the milling drum 4 show. The edge protection 7 is in the FIGS. 2 to 8 not shown.

The scraper blade 10 has a lower scraper element 11 and an upper scraper element 12, wherein the lower scraper element 11 is arranged in the working direction A in front of the upper scraper element 12. Both stripping elements 11, 12 are substantially rectangular plates. The upper stripping element 12 is fastened to a component of the milling drum housing 5 so as to be pivotable about a pivot axis 13, which runs parallel to the axis of rotation 6 of the milling drum 4. The lower stripping element 11 has two guide elements 14 arranged at a distance from one another, which are guided in two spaced-apart guides 15 of the upper stripping element 12, so that the lower stripping element 11 can be displaced relative to the upper stripping element 12.

The actuator 16 for actuating the scraper blade 10 has a pair of piston / cylinder assemblies 17 which are spaced from each other. The first piston / cylinder assembly 17 is on one side and the second piston / cylinder assembly 17 is disposed on the other side of the scraper blade 10 at a distance from the respective edge of the scraper blade. The cylinders of the piston / cylinder assemblies 17 are pivotally mounted on holders 20 of the milling drum housing 5 about a pivot axis 21 which is parallel to the axis of rotation 6 of the milling drum 4 and the pivot axis 13 of the scraper blade 10. The pistons or piston rods 19 of the piston / cylinder arrangements 17 are pivotably attached to holders 22 of the lower scraper element 11 about a pivot axis 23 which runs parallel to the pivot axis 21 of the piston / cylinder assemblies 17. The upper stripping element 12 can be locked to side parts 24 of the milling drum housing 5. To lock the upper stripping element 12, the actuating device 16 has two locking devices 25, which each have the actuating unit according to the invention. The locking means 25 are arranged between the piston / cylinder assemblies 17 and the side parts 24 of the roller housing 5.

Fig. 9 shows a first embodiment of the actuating unit of the locking devices 25. The actuating unit has a holding part 26, which is a cylindrical rod in the present embodiment. The holding part 26 is connected to a piston 27, wherein the longitudinal axis of the holding part 26 and the longitudinal axis of the piston 27 form a right angle. For this purpose, one end piece of the holding part 26 is inserted into a recess 28 of the piston 27 and the holding part 26 is screwed to the piston 27 by means of a screw 29. The recess 28 in the piston 27 is located midway between the piston ends. The piston is enclosed by a cylinder 30 to form a first cylinder space 31 on one side of the piston and a second cylinder space 32 on the other side of the piston. In this case, the holding part 26 extends through a recess 33 in the cylindrical wall of the cylinder, wherein the recess 33 extends in the longitudinal direction of the cylinder 30. The width of the recess 33 corresponds to the diameter of the holding part 26, so that holding part 26 and cylinder 30 can not be rotated against each other. The cylinder 30 is closed at both ends with caps 34, 35, which can be screwed. The sealing of piston 27 and cylinder 30 takes place with the known sealing packages 36, which sit in annular grooves 37 of the piston 27 or cylinder 30.

On both sides of the holding part 26 are located on the piston 27 fluid ports 38, 39 which are inserted into recesses 40, 41 of the piston 27. The fluid ports 38, 39 are in the present embodiment conventional connections for hydraulic lines, not shown. From the first fluid port 38, a first fluid passage 42 leads to the one piston end and from the second fluid port 39 leads second fluid channel 43 the other piston end, so that the first and second cylinder chamber 31, 32 can be acted upon with hydraulic oil.

The holding member 26 of the operating unit is fixed with a bracket 44 which is provided on the lower portion of the upper scraper element 12 between the piston / cylinder assembly 17 and the side wall 24. The holder 44 has a bore 45 into which the holding part 26 is inserted. The holding part can be clamped by means of a clamping screw 46 ( FIGS. 2 to 8 ).

When the first cylinder space 31 is supplied with hydraulic oil, the cylinder 30 moves to the one side while the cylinder 30 moves to the other side when the second cylinder space 32 is supplied with hydraulic oil. Chamfers 47 are provided on the end walls of the piston 27, so that the end face of the piston is effective for the hydraulic oil when the cylinder is in one of the two end positions. The cylinder 30 therefore constitutes a "safety bolt" which can be advanced and retracted.

The two end pieces of the cylinder 30 are slidably guided in recesses 49 of support members 50, which are secured to the lower end portion of the upper stripping element 12 at a distance from each other. In the advanced position engages the one end of the cylinder 30 in a recess 48 which is provided in the side wall 24 of the Fräswalzengehäuses 5, wherein the end pieces sit in the recesses 49 of the two support members 50. In the retracted position, the one end is not in the recess 48 of the side wall 24, but only in the recess 49 of the support member 50. Thus, the upper stripping member 12 is engaged with the side member 24, i.e., disengaged. H. be locked or unlocked. The forces or torques that may occur due to the locking are absorbed by the support members 50. Hereinafter, the function of the scraper blade 10 and the actuator 16 will be described in detail.

The pistons or piston rods 19 and cylinder 18 of the piston / cylinder assemblies 17 are formed in such a way and their pivot axes 21, 23 are arranged such that a Actuation of the piston / cylinder assemblies 17 to the subsequent movements of the stripping elements 11, 12 leads.

Fig. 2 shows the scraper blade 10 in a substantially vertical position, so that the milling drum housing 5 is closed in the working direction A behind the milling drum 4. The lower stripping element 11 is in the lowered position, in which the piston or piston rods 19 of the piston / cylinder assemblies 17 extended and the upper stripping element 12 is locked, ie the cylinder 30 is seated in the recess 48. In this locked position can lower stripping 11 are raised. To raise the lower stripping element 11, the pistons or piston rods 19 of the piston / cylinder arrangements 17 are retracted. Fig. 3 shows the lower stripping element 11 in the raised position, in which the piston / cylinder assemblies 17 are fully retracted. Consequently, the milling drum housing 5 is open below the upper stripping element 12.

In the upper stripping element 12, a closable material outlet 53, for example a flap, can be provided between the piston / cylinder arrangements 17. Therefore, the piston / cylinder assemblies 17 should be arranged in the greatest possible distance from each other, so that the largest possible material outlet can be formed. This results in cramped space conditions in the region of the two sides of the scraper blade 10. It turns out that with the actuation units according to the invention despite the tight space a secure locking is possible.

The FIGS. 4 and 5 show how the scraper blade is folded up about the pivot axis 13. Attached to the lower stripping element 11 are entrainment elements 52 associated with the two actuation units, which can engage the actuators' cylinders 30 when the upper stripping element 12 is unlocked and the cylinders 30 are retracted. In this position, the end pieces of the cylinder 30 protrude a little from the recesses 49 of the inner support members 50, so that the driving elements 52 can abut against the cylinders 30 during the upward movement of the lower stripping element 11.

To fold up the scraper blade 10, the upper stripping element 12 is unlocked. When the upper scraper element 12 is unlocked, actuation of the piston / cylinder assemblies 17 results in pivotal movement of the scraper blade 10 about the pivot axis 13. This pivotal movement begins when the follower members 52 engage the protruding end portions of the cylinders 30 during the upward movement of the lower scraper member 11 the actuators come into engagement. Fig. 5 shows the position of the scraper blade 10, in which the piston / cylinder assemblies 17 are fully retracted, so that the scraper blade is completely folded up. The entrainment elements 52 are arranged on the lower stripping element such that the pivoting movement begins even when the lower stripping element is not yet in the highest position ( Fig. 3 ). Consequently, the pivoting movement begins even in a height position in which the vertical upward movement of the lower scraper element 11 is not yet completed. Therefore, the piston / cylinder assemblies 17 may have a shorter length than when the pivoting movement takes place only when the lower stripping element 11 is fully raised.

Fig. 10 shows a second embodiment of the actuating unit, which differs only in the structure, but not in the function of the first embodiment. The corresponding parts are denoted by the same reference numerals. The second embodiment differs from the first embodiment in that the cylinder 30 includes an outer cylinder part 30A and two inner cylinder parts 30B, 30C on one side and two inner cylinder parts 30B, 30C on the other side. The multi-part design of the cylinder 30 has manufacturing advantages, since the grooves 37 for the seal packages 36 can easily bring. In this embodiment, the first and second cylinder chambers 31, 32 extend into the outer, inner cylinder part 30C. The outer, inner cylinder parts 30C act as cover parts or caps, which can be screwed to the outer cylinder part 30A. In the embodiment of Fig. 10 For example, the holding part 26 has at one end a shoulder 26A with an external thread 26B and the piston 27 has an internal thread 51 in order to be able to screw both parts together. The other end piece has a hexagonal profile 26C for a spanner.

Claims (15)

1. Actuating unit for locking a component of a construction machine, in particular a road milling machine or a road miner, comprising a retaining part (26) for fastening to the construction machine, a piston (27) being connected to the retaining part (26) and being surrounded by a cylinder (30) around the whole circumference, with a first cylinder chamber (31) being formed on one side of the piston and a second cylinder chamber (32) being formed on the other side of the piston, a first fluid connection (38) being in fluid communication with the first cylinder chamber (31) and a second fluid connection (39) being in fluid communication with the second cylinder chamber (32), and a cut-out (33) which extends in the direction of the longitudinal axis of the cylinder and through which the retaining part (26) extends being provided in the cylindrical wall of the cylinder (30).
2. Actuating unit according to claim 1, characterised in that the first and the second fluid connection (38, 39) are provided on the piston (27), the first and the second fluid connection (38, 39) extending through the cut-out (33) in the cylindrical wall of the cylinder (27).
3. Actuating unit according to claim 2, characterised in that the first fluid connection (38) is arranged on the piston (27) on one side of the retaining part (26) and the second fluid connection (39) is arranged on the piston (27) on the other side of the retaining part, a first fluid channel (42) leading from the first fluid connection (38) to the first cylinder chamber (31) being formed on one side of the retaining part (26) in the piston (27) and a second fluid channel (43) leading from the second fluid connection (39) to the second cylinder chamber (32) being formed on the other side of the retaining part (26) in the piston (27).
4. Actuating unit according to any of claims 1 to 3, characterised in that the retaining part (27) comprises an elongate body, the longitudinal axis of which extends perpendicularly to the longitudinal axis of the cylinder (30).
5. Actuating unit according to claim 4, characterised in that the retaining part (26) is a cylindrical rod.
6. Actuating unit according to any of claims 1 to 5, characterised in that the cylinder (30) comprises an outer cylinder part (30A) and at least one inner cylinder part (30B, 30C) that is inserted into the outer cylinder part on one side of the outer cylinder part (30A), and at least one inner cylinder part (30B, 30C) that is inserted into the outer cylinder part on the other side of the outer cylinder part (30A), the cut-out (33) in the cylindrical wall of the outer cylinder part (30A) being provided between the at least one inner cylinder part (30B, 30C) on one side of the outer cylinder part (30A) and the at least one inner cylinder part (30B, 30C) on the other side of the outer cylinder part (30A).
7. Actuating unit according to claim 6, characterised in that one end part of the piston (27) is arranged in the at least one inner cylinder part (30B, 30C) on one side of the outer cylinder part and the other end part of the piston (27) is arranged in the at least one inner cylinder part (30B, 30C) on the other side of the outer cylinder part.
8. Self-propelled construction machine, in particular a road milling machine or a road miner, comprising at least two movably interconnected components and at least one actuating unit according to any of claims 1 to 7 that is assigned to the two movably interconnected components.
9. Self-propelled construction machine according to claim 8, characterised in that a cut-out (49) for receiving the cylinder (30) of the actuating unit is provided on one of the two movably interconnected components, and the retaining part (26) of the actuating unit is fastened to the other component such that the cylinder (30) is pushed forward into the cut-out when the first or second cylinder chamber (31, 32) is supplied with a fluid such that the two components are in engagement, and the cylinder (30) is pulled back out of the cut-out when the second or first cylinder chamber (32, 31) is supplied with a fluid such that the two components are out of engagement.
10. Self-propelled construction machine according to claim 9, characterised in that at least one support part (50) comprising a cut-out (49) in which the cylinder (30) can be slid or into which the cylinder (30) can be slid is provided on the component to which the retaining part (26) is fastened.
11. Self-propelled construction machine according to any of claims 8 to 10, characterised in that a mount (44) for fastening the retaining part (26) of the actuating unit is provided on the component to which the retaining part (26) is fastened.
12. Self-propelled construction machine according to any of claims 8 to 11, characterised in that the construction machine comprises a machine frame (2) supported by running gears (1A, 1B) and a milling drum (4) for machining the ground that is arranged in a milling drum housing (5), which can be closed off by a scraper plate (10) behind the milling drum (4) in the working direction (A),
    the scraper plate (10) comprising an upper scraper element (12) that is fastened to a component of the machine frame (2) or milling drum housing (5) so as to be pivotable about a pivot axis (13) that is parallel to the milling drum axis (6), and comprising a lower scraper element (11) that is movable relative to the upper scraper element (12) between a position in which it is lowered onto the ground and a raised position,
    at least one cut-out (48) for receiving the cylinder (30) of the at least one actuating unit being provided on a component of the machine frame (2) or milling drum housing, and the retaining part (26) of the at least one actuating unit being fastened to the upper scraper element (12) such that the cylinder (30) is pushed forward into the cut-out (48) when the first or second cylinder chamber (31, 32) is supplied with a fluid such that the upper scraper element (12) is locked, and the cylinder (30) is pulled back out of the cut-out (48) when the second or first cylinder chamber (32, 31) is supplied with a fluid such that the upper scraper element (12) is unlocked,
    and an actuating device (16) being provided which is designed such that, when the upper scraper element (12) is locked, the lower scraper element (11) can be moved between the lowered and the raised position and, when the upper scraper element (12) is unlocked, the lower and the upper scraper element (11, 12) can be pivoted about the pivot axis (13) into a raised position.
13. Self-propelled construction machine according to claim 12, characterised in that the actuating device comprises a first piston/cylinder arrangement (17) and a second piston/cylinder arrangement (17), which are arranged on the scraper plate (10) at a distance from one another, a first actuating unit being arranged in a region between the first piston/cylinder arrangement (17) and a side part (24) of the machine frame (2) or milling drum housing and a second actuating unit being arranged in a region between the second piston/cylinder arrangement (17) and a side part (24) of the machine frame (2) or milling drum housing, the cut-out (48) for receiving the cylinder (30) of the actuating unit being provided in the side part (24) of the machine frame (2) or milling drum housing.
14. Self-propelled construction machine according to claim 13, characterised in that the cylinders (18) of the first and second piston/cylinder arrangement (17) can be pivoted about an axis (21) extending in parallel with the pivot axis (13) of the scraper plate (10) on a component of the machine frame (2) or milling drum housing, and the pistons or piston rods (19) of the first and second piston/cylinder arrangement (17) are fastened in the region of the lower portion of the lower scraper element (11).
15. Self-propelled construction machine according to either claim 13 or claim 14, characterised in that the first and the second actuating units are arranged in the region of the lower portion of the upper scraper element (12).

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