EP3735388B1 - Mobile crane with an hydraulic luffing extension boom - Google Patents
Mobile crane with an hydraulic luffing extension boom Download PDFInfo
- Publication number
- EP3735388B1 EP3735388B1 EP19700133.2A EP19700133A EP3735388B1 EP 3735388 B1 EP3735388 B1 EP 3735388B1 EP 19700133 A EP19700133 A EP 19700133A EP 3735388 B1 EP3735388 B1 EP 3735388B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder
- hydraulic
- luffing
- main boom
- hose
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000012530 fluid Substances 0.000 claims description 48
- 239000007789 gas Substances 0.000 claims description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 239000010720 hydraulic oil Substances 0.000 description 14
- 238000010586 diagram Methods 0.000 description 10
- 238000004804 winding Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012432 intermediate storage Methods 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/20—Control systems or devices for non-electric drives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/64—Jibs
- B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
- B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
- B66C23/702—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic with a jib extension boom
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/82—Luffing gear
Definitions
- the invention relates to a mobile crane with a main boom and with a main boom extension articulated to the main boom and luffing by means of at least one luffing cylinder, the luffing cylinder being connected to a hydraulic hose in such a way that the hydraulic fluid either flows towards the luffing cylinder or flows away from the luffing cylinder, whereby the main boom is telescopic and consists of a basic box and further telescopic sections arranged in it that can be telescoped in and out.
- the German utility model DE 20 2004 020 760 U1 discloses a mobile crane with a main boom which consists of a basic box and telescopic sections which can be telescoped in and out of it.
- a main boom extension is linked to a head of the main boom and can be pivoted about a luffing axis relative to the main boom by means of a luffing cylinder.
- the luffing cylinder is in the usual way a hydraulic piston-cylinder unit.
- the luffing cylinder is supplied with hydraulic energy via an independent hydraulic unit with an internal combustion engine, which is arranged on the head of the main boom or, particularly preferably, on a foot of the main boom extension.
- the hydraulic unit which is arranged decentrally in the area of the head of the main boom, is, however, also associated with disadvantages, since the entire weight of this hydraulic unit has to be carried along with each adjustment process of the main boom. The maintenance effort and thus the costs in order to ensure sufficient functional reliability of the hydraulic unit arranged high above are also increased.
- the disclosure document DE 24 06 57 A1 discloses a crane with a telescopic main boom and fly jib.
- a hydraulic cylinder used to telescope a jib foot of the fly jib is described as "single acting”. No information is given about the supply of hydraulic fluid to the hydraulic cylinder.
- the writing too JP S63 46 465 describes a main boom with a fly jib that can be luffed hydraulically via a single-acting luffing cylinder. How hydraulic fluid gets to the luffing cylinder is open.
- a mobile crane with a telescopic boom with an outer and several inner boom sections A luffing jib that can be luffed is hinged to the upper end of the innermost boom section.
- a hydraulic luffing cylinder is provided for luffing the luffing jib.
- the luffing jib is rocked by gravity.
- the luffing cylinder is connected to a cylinder ring space of a telescoping cylinder with only one hydraulic hose for supplying and removing hydraulic oil via a hydraulic control.
- the hydraulic hose can be wound up via a hose drum arranged on a roller head of the innermost boom section. Since the length to be bridged by the hydraulic hose is short, the hose reel can be made correspondingly small.
- German utility model DE 20 2014 006 861 U1 already has a link crane that is used to load and manipulate wood in the forestry sector.
- the link crane has a base on which a main arm is articulated and a luffing arm with a gripper is articulated on it.
- the main arm and the rocker arm can each be pivoted via hydraulic cylinders.
- the hydraulic cylinders are part of a hydraulic system that has a hydraulic pressurized gas reservoir for the intermediate storage of positional energy, which occurs, for example, when the main or rocker arm is lowered and then to the Raising the main arm or rocker arm can be reused.
- the invention is therefore based on the object of providing a vehicle crane with a hydraulically luffing main boom extension, the maintenance effort and assembly effort of which is reduced and which can thus be provided more cheaply.
- the principle of the present invention can be described as operating a conventional double-acting hydraulic differential cylinder predominantly to completely in the manner of a single-acting hydraulic differential cylinder in order to achieve the goal of using two parallel hydraulic hoses, in particular of No twin hoses to supply the hydraulic cylinder with hydraulic fluid.
- the then only simple hydraulic hose is smaller and easier to wind, so that an associated hose reel can be built correspondingly smaller and simpler.
- the simple hydraulic hose is to be understood as a hydraulic hose which has only one flow channel for hydraulic fluid and thus, in terms of time, the hydraulic fluid either flows through the flow channel to the luffing cylinder or flows away from the luffing cylinder.
- the hydraulic fluid either flows exclusively towards the luffing cylinder through the flow channel or exclusively flows away from the luffing cylinder and is therefore only operated in one of the two flow directions in terms of time.
- a twin hose or a hydraulic hose with more than two flow channels could be operated in an inventive manner if the flow through the individual flow channels is parallel and only in a common flow direction. With such hoses, the previously described winding advantage could then be omitted.
- the hydraulic hose advantageously has a round cross section, which in particular simplifies winding up the hydraulic hose.
- the core idea of the present invention is thus to apply hydraulic fluid, in particular hydraulic oil, to the luffing cylinder for luffing the main boom extension relative to the main boom via a flow channel, and for the return movement of the luffing cylinder, predominantly the dead weight of the main boom extension or spring forces, in particular for angling from a steep one 0 ° position of the main boom extension, to be used.
- hydraulic fluid in particular hydraulic oil
- the luffing cylinder can thus be connected to a hydraulic hose with a single flow channel for supplying hydraulic fluid.
- the hydraulic fluid flows back and forth in the hydraulic hose.
- the hydraulic hose is guided along the main boom, in particular via hose guides.
- the luffing cylinder has a Rod space and a cylinder space, either only the rod space or only the cylinder space is connected to the hydraulic hose.
- the cylinder space or rod space that is not connected to the hydraulic hose is advantageously connected to the atmosphere without pressure.
- the luffing cylinder has a rod space and a cylinder space, wherein either only the rod space or only the cylinder space is connected to the hydraulic hose and the cylinder space or rod space not connected to the hydraulic hose is connected to a pressure medium, preferably a gas, is particularly preferably filled with nitrogen.
- the luffing cylinder is assigned a valve via which an outflow of the hydraulic fluid from the luffing cylinder and thus an angle of the main boom extension can be controlled.
- the luffing cylinder is designed as a pulling cylinder or as a pressure cylinder.
- the luffing cylinder acts on one side.
- the luffing cylinder By acting on only one side of the luffing cylinder with hydraulic fluid, it is consequently possible to dispense with a more complex and thus more expensive twin hose, which can twist when it is wound up, as a result of which a winding radius is unintentionally increased.
- the luffing cylinder has a rod space and a cylinder space, wherein the rod space and the cylinder space can be connected to the hydraulic hose.
- a switch valve and a bladder accumulator are assigned to the rocker cylinder.
- the pressure surface in the cylinder space, on which hydraulic fluid can act is increased by the contact surface of a cylinder rod compared to the pressure surface in the rod space, so that consequently hydraulic fluid is applied to the cylinder space and hydraulic fluid can flow out of the rod space.
- the rod space can be connected to the cylinder space or to a bladder accumulator, which is filled with hydraulic fluid and gas, via the switching valve.
- hydraulic fluid is applied to the luffing cylinder in the manner of a luffing cylinder acting on one side via a single flow channel. An expensive and disadvantageous twin hose can thus also be dispensed with here.
- Telescopic cranes are characterized by the fact that the crane boom consists of several telescopic sections that can be telescoped into one another, whereas in a lattice boom crane the boom consists of several rigidly interconnected lattice mast elements.
- a mobile crane is understood as a mobile crane with a telescopic boom or as a crawler crane.
- the main boom is telescopic and consists of a basic box and further telescopic sections which are arranged in it and which can be telescoped in and out.
- the hydraulic hose for supplying the luffing cylinder with hydraulic energy can be unwound from or wound onto a hose drum while the main boom is being telescoped in and out.
- the hydraulic hose can be wound onto the hose drum in several layers, like a rope or cable drum, next to one another and one above the other.
- the hose reel is arranged on the main boom, in particular on the base box.
- the mobile crane has an undercarriage and an uppercarriage rotatably mounted thereon.
- the Figure 1 shows a mobile crane 1 with an undercarriage 2 with driver's cab and five drive axles as well as with an uppercarriage 3 with a telescopic main boom 4, which is mounted on the undercarriage 2 via a rotating connection second position II.
- the main boom 4 can be luffed between the positions I and II in the usual way via a hydraulic erecting cylinder 16, which is supported on the superstructure 3 and on the main boom 4. In the erected position II, the main boom 4 is shown in its fully extended state.
- the main boom 4 is designed as a telescopic boom with a base box 6 and four telescopic sections 7 to 10 arranged therein in a known manner so that it can be telescoped in and out, and thus the mobile crane 1 is designed as a telescopic crane.
- a free and upper end of the innermost telescopic section 10 serves as a head 4a on which the main boom extension 5 is releasably attached.
- the main boom extension 5 can be used temporarily or permanently with the mobile crane 1 in order to achieve a total length that goes beyond the largest boom length of the main boom 4.
- the main boom extension 5 is pivotably connected to the head 4a of the main boom 4 via bolts at its foot 5a about a luffing axis A.
- the main boom extension 5 is shown in a 0 ° position, a 20 ° position and a 40 ° position.
- the degrees refer to a luffing angle a between the main boom 4 and the main boom extension 5.
- the main boom extension 5 is at least partially designed in the usual way as a lattice boom in a lattice-tubular construction and has an adjoining box tip.
- the main boom extension 5 can of course, in a departure from the exemplary embodiment shown here, also be designed overall as a lattice boom.
- the main boom extension 5 can be luffed up and down relative to the main boom 4 by means of a hydraulic luffing cylinder 14 about the luffing axis A, which is aligned essentially horizontally and parallel to a further luffing axis of the main boom 4.
- a hydraulic hose 13 is provided, which is connected at one end to the luffing cylinder 14 and is guided along the main boom 4 or the telescopic sections 7, 8, 9, 10 to a hose drum 12.
- the hose reel 12 is arranged on and to the side of the base box 6.
- the hose reel 12 is mounted about a horizontal axis of rotation D arranged parallel to the rocking axis A.
- the hose reel 12 is driven or resiliently pretensioned for winding and unwinding the hydraulic hose 13.
- the hydraulic hose 13 is additionally connected via hose guides 15 along the main boom 4 (see Figure 2 ) guided.
- the hose guides 15 are each arranged at the upper ends or heads of the telescopic sections 7 to 10 (see Figure 2 ).
- the Figure 2 shows a detailed view of the in FIG Figure 1 Z from the area of the coupling of the main boom extension 5 to the main boom 4.
- the main boom 4 and the main boom extension 5 are, however, in the horizontally stored position I, in which the Telescopic sections 7 to 10 are not telescoped out and the hydraulic hose 13 is completely wound onto the hose reel 12.
- the main boom extension 5 is also aligned as an extension to the main boom 4, ie the luffing angle w is 0 °.
- at least one luffing cylinder 14 is arranged between the head 4a of the main boom 4 and the foot 5a of the main boom extension 5.
- the luffing cylinder 14 is bolted with its housing 14a to the head 4a of the main boom 4 and with its piston rod 14b to the foot 5a of the main boom extension 5.
- the luffing cylinder 14 shown is designed as a hydraulic cylinder acting on one side and as a pulling cylinder.
- a reverse installation of the luffing cylinder 14 is of course also conceivable.
- a hydraulic line 13a is connected to the housing 14a of the luffing cylinder 14 and preferably opens into a rod area of the luffing cylinder 14.
- This hydraulic line 13a is connected to the hydraulic hose 13 at its other end in the area of the head 4a of the main boom 4.
- the hydraulic hose 13 fastened in the area of the head 4a of the main boom 4 is guided to the hose drum 12 via a hose guide 15 for each telescopic section 7, 8, 9, 10.
- Each hose guide 15 preferably consists essentially of two oppositely arranged guide rollers with a groove between which the hydraulic hose 13 is guided.
- the hose guides 15 are each arranged at the upper end of the telescopic sections 7, 8, 9, 10 or the base box 6.
- the luffing cylinder 14 is connected to a hydraulic hose 13 in such a way that, in terms of time, the hydraulic fluid either flows towards the luffing cylinder 14 or flows away from the luffing cylinder 14, so that only one hydraulic supply line with a single flow channel is required.
- the hydraulic hose 13 is therefore not designed as a twin line, but only as a single line.
- This hydraulic hose 13, designed as a single line, is wound and unwound on the hose drum 12 in multiple layers and not just in a spiral shape.
- the hose reel 12 preferably has hose grooves and flange washers on the edges of the hose reel 12 in order to support orderly winding.
- the single line of the Hydraulic hose 13 thus in every position next to one another and in layers one above the other.
- the hydraulic hose 13 can be wound up in an orderly manner in multiple layers.
- the multi-layer spooling is made possible by special cable grooves milled into the body of the hose reel, which in sections run parallel to the outboard pulley and are connected via so-called crossing areas offset by about 120 ° to 180 °. The crossing areas ensure the required gradient per revolution of the drum and ensure constant and pyramid-shaped hose winding.
- the Figure 3 shows a schematic hydraulic circuit diagram in relation to the luffing cylinder 14, of which only a rod space 14c of the housing 14a is supplied with hydraulic oil via the hydraulic hose 13 and the first hydraulic line 13a with a valve 17.
- the hydraulic hose 13, which can be guided along the telescopic sections 7 to 10 (see Figures 1 and 2 ) and which can be wound up on a hose reel 12 is fed with hydraulic fluid, in particular hydraulic oil, from a container 21 in the area of the hose reel 12 via a second hydraulic line 13b by means of a pump 19. If the hydraulic fluid is drained from the rod space 14c, it flows through the first hydraulic line 13a, the valve 17, the hydraulic hose 13 and the second hydraulic line 13b back via a return valve 20 into the container 21.
- a cylinder space 14d of the housing 14a can be depressurized are in connection with the atmosphere.
- the cylinder space 14d is filled with gas, in particular nitrogen.
- an external gas reservoir 18 is connected to the cylinder space 14d.
- the gas accumulator 18 can also be designed as a bladder accumulator with gas filling, hydraulic fluid, in particular hydraulic oil, then being located in the cylinder space 14d as a non-compressible pressure medium.
- a gas filling in the cylinder space 14d without a gas reservoir 18 can also be sufficient.
- a piston rod 14b can also be made hollow. The installation dimensions of the hydraulic cylinder 14 can then be retained. It is also possible that instead of a pressure medium, a mechanical spring is arranged in the cylinder space 14d or outside in the mechanism.
- the hydraulic energy required for luffing the main boom extension 5 is made available in the form of hydraulic oil via the hydraulic hose 13, with oil only being applied to the ring side. At the same time, the gas or hydraulic oil is compressed in the cylinder space 14d or atmospheric air is forced out. By closing the valve 17, the oil pressure and thus the rocking angle w can also be maintained if necessary.
- the filling of the cylinder space 14d with compressed gas or pressurized hydraulic oil leads to a pretensioning of the luffing cylinder 14, so that the main boom extension 5 can be luffed off more quickly. It is also advantageously possible, with the preload and the oil pressure in the rod space 14c, to retract and extend the hydraulic cylinder 14 without external forces, so that, for example, a bolting position can be approached during set-up.
- the hose reel 12 is also possible to arrange the hose reel 12 on the upper carriage 3. It can also be provided that the hydraulic line 13a is connected to a cylinder side of the luffing cylinder 14.
- the luffing cylinder 14 can also be operated as a pressure cylinder instead of a pulling cylinder, the rod space and the cylinder space then being exchanged and the cylinder space being filled with hydraulic fluid and the rod space being filled with pressure medium.
- the hydraulic hose 13 can be connected directly to the luffing cylinder 14 without the hydraulic line 13a.
- FIG. 4a to 4d Another embodiment of the invention is shown with a bladder accumulator 22 instead of a gas accumulator 18.
- the Figure 4a shows a schematic hydraulic circuit diagram for the main boom 4 in the erected position II and the main boom extension 5 in the 0 ° position.
- a bladder accumulator 22 and a switchover valve 23 are provided and the first hydraulic line 13a is connected to the tilting cylinder 14 in a different manner.
- the first hydraulic line 13a is connected to the rod space 14c and also to the cylinder space 14d via the switchover valve 23.
- the bladder accumulator 22 and the hydraulic hose 13 are also connected to the switching valve 23.
- the switching valve 23 is in the position shown in FIG Figure 4a shown first position.
- the bladder accumulator 22 is filled with hydraulic fluid and decoupled from the hydraulic hose 13 and the first hydraulic line 13a.
- the hydraulic hose 13 which is under a system pressure of the hydraulic system, is connected to the cylinder chamber 14d and also to the rod chamber 14c via the switchover valve 23 and the first hydraulic line 13a. Hydraulic fluid, in particular hydraulic oil, now flows in the direction of flow ⁇ to the luffing cylinder 14.
- the effective pressure surface on piston 14e is larger than the opposite effective pressure surface in the rod chamber 14c, which is reduced by the fastening surface of the cylinder rod 14b, so that consequently piston 14e is moved to the right or the piston rod 14b extends slowly.
- the cylinder space 14d is filled with hydraulic fluid and hydraulic fluid flows out of the rod space 14c.
- the switching valve 23 is moved into the second position, which is shown in the schematic hydraulic circuit diagram in FIG Figure 4b is shown.
- the main boom extension 5 is tipped further by its own weight or by any load on the main boom extension 5.
- the switchover valve 23 connects the bladder accumulator 22 to the cylinder chamber 14d, so that hydraulic fluid flows from the bladder accumulator 22 into the cylinder chamber 14d.
- the hydraulic fluid located in the rod space 14c flows out of the rod space 14c in the flow direction> via the valve 17 in the direction of the upper carriage 3 or the container 21.
- FIG Figure 4c A schematic hydraulic circuit diagram for the opposite process, namely luffing the main boom extension 5, is shown in FIG Figure 4c shown.
- the rod space 14c is acted upon by hydraulic fluid in the third position in the direction of flow via the hydraulic hose 13 and the switchover valve 23.
- the luffing cylinder 14 works against the weight of the main boom extension 5. Hydraulic fluid also flows from the cylinder chamber 14d into the bladder accumulator 22.
- FIG 4d a schematic hydraulic circuit diagram for the end position after luffing up the main boom extension 5 is shown.
- the cylinder space 14d and rod space 14c are not connected to the hydraulic hose 13 and the luffing cylinder 14 is therefore blocked.
- the switching valve 23 connects the bladder accumulator 22 to the hydraulic hose 13. From the full bladder accumulator 22 only the amount of hydraulic fluid is drained in the flow direction> towards the container 21, which there due to the in Figure 4a The supply of hydraulic fluid shown for the first luffing of the main boom extension 5 is also present.
- the rod space 14c is connected to the bladder accumulator 22.
- the hydraulic hose 13 which is under a system pressure of the hydraulic system, is connected to the cylinder chamber 14d via the switchover valve 23 and the first hydraulic line 13a. Hydraulic fluid, in particular hydraulic oil, now flows to the luffing cylinder 14.
- the cylinder space 14d is filled with hydraulic fluid and hydraulic fluid flows out of the rod space 14c into the bladder accumulator 22.
- the luffing cylinder 14 can also be used with a correspondingly adapted switchover valve 23 for equipping the vehicle crane 1.
- the luffing cylinder 14 only performs small alignment movements, in particular in the range from 0 to 100 mm, preferably from 0 to 50 mm, particularly preferably from 0 to 5 mm, without force. Without force in the present case means that the piston rod 14b or the housing of the luffing cylinder 14 is not articulated to the main boom extension 5 or to the foot of the main boom extension 5a, but is free to align the luffing cylinder 14 before it is bolted to the main boom extension 5a make possible.
- the cylinder space 14d or the rod space 14c is brought into connection with the hydraulic hose 13 via the switching valve 23 and is supplied with hydraulic fluid via this.
- the rod space 14c or cylinder space 14d filled with hydraulic fluid is connected to the bladder accumulator 22 via the switching valve so that the hydraulic fluid displaced from the rod space 14c or cylinder space 14d can flow into the bladder accumulator 22.
- the bladder accumulator 22 thus replaces to a limited extent Scope of the non-existent return hydraulic line. Excess hydraulic fluid in the bladder accumulator 22 can be drained via the hydraulic hose 13 to the container 21 via a suitable position of the switching valve 23, which connects the bladder accumulator 22 to the hydraulic hose 13.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
- Jib Cranes (AREA)
Description
Die Erfindung betrifft einen Fahrzeugkran mit einem Hauptausleger und mit einer an dem Hauptausleger angelenkten und mittels mindestens eines Wippzylinders wippbaren Hauptauslegerverlängerung, wobei der Wippzylinder an einen Hydraulikschlauch in der Weise angeschlossen ist, dass die Hydraulikflüssigkeit entweder zu dem Wippzylinder hinströmt oder von dem Wippzylinder wegströmt, wobei der Hauptausleger teleskopierbar ist und aus einem Grundkasten und weiteren darin angeordneten, ein- und austelekopierbaren Teleskopschüssen besteht.The invention relates to a mobile crane with a main boom and with a main boom extension articulated to the main boom and luffing by means of at least one luffing cylinder, the luffing cylinder being connected to a hydraulic hose in such a way that the hydraulic fluid either flows towards the luffing cylinder or flows away from the luffing cylinder, whereby the main boom is telescopic and consists of a basic box and further telescopic sections arranged in it that can be telescoped in and out.
Die deutsche Gebrauchsmusterschrift
Auch ist in dieser Gebrauchsmusterschrift bereits beschrieben, anstatt eines dezentralen Hydraulikaggregats eine angetriebene oder federnd vorgespannte Schlauchtrommel für Hydraulikleitungen zur Versorgung des Wippzylinders an dem Grundkasten oder an einem Oberwagen des Mobilkrans anzuordnen. Da die Schlauchtrommel in Abhängigkeit von der Länge der Hydraulikleitung einen vergleichsweise großen Durchmesser aufweist, kann sich dies nachteilig auf eine Bauhöhe, insbesondere eine Transporthöhe, des Mobilkrans auswirken. Für eine Straßenfahrt, bei der die Höhe des Mobilkrans auf 4 Meter beschränkt ist, wird daher üblicherweise die Schlauchtrommel abmontiert und am Einsatzort wieder montiert, so dass hieraus ein erhöhter Montageaufwand resultiert.Also in this utility model it is already described, instead of a decentralized hydraulic unit, to arrange a driven or resiliently preloaded hose reel for hydraulic lines for supplying the luffing cylinder on the base box or on an upper carriage of the mobile crane. Since the hose reel has a comparatively large diameter as a function of the length of the hydraulic line, this can have a disadvantageous effect on the overall height, in particular the transport height, of the mobile crane. For one Road travel where the height of the mobile crane is limited to 4 meters, the hose reel is therefore usually dismantled and reassembled at the place of use, so that this results in increased assembly costs.
Die Offenlegungsschrift
Auch die Schrift
Des Weiteren ist aus der deutschen Gebrauchsmusterschrift
Auch zeigt die deutsche Gebrauchsmusterschrift
Ferner ist in der deutschen Offenlegungsschrift
Der Erfindung liegt daher die Aufgabe zugrunde, einen Fahrzeugkran mit einer hydraulisch wippbaren Hauptauslegerverlängerung bereit zu stellen, dessen Wartungsaufwand und Montageaufwand reduziert ist und der somit günstiger bereitgestellt werden kann.The invention is therefore based on the object of providing a vehicle crane with a hydraulically luffing main boom extension, the maintenance effort and assembly effort of which is reduced and which can thus be provided more cheaply.
Diese Aufgabe wird durch einen Fahrzeugkran mit den Merkmalen des Anspruchs 1 gelöst. In den abhängigen Ansprüchen 2 bis 9 sind vorteilhafte Ausgestaltungen der Erfindung angegeben.This object is achieved by a mobile crane with the features of claim 1. In the
Ein Fahrzeugkran mit einem Hauptausleger und mit einer an dem Hauptausleger angelenkten und mittels mindestens eines Wippzylinders wippbaren Hauptauslegerverlängerung, wobei der Wippzylinder an einen Hydraulikschlauch in der Weise angeschlossen ist, dass die Hydraulikflüssigkeit entweder zu dem Wippzylinder hinströmt oder von dem Wippzylinder wegströmt, wobei der Hauptausleger teleskopierbar ist und aus einem Grundkasten und weiteren darin angeordneten, ein- und austelekopierbaren Teleskopschüssen besteht, wobei der Wippzylinder an den Hydraulikschlauch mit einem einzigen Strömungskanal zur Versorgung mit Hydraulikflüssigkeit angeschlossen ist, wird erfindungsgemäß dadurch verbessert, dass der Hydraulikschlauch entlang des Hauptauslegers geführt ist, der Hydraulikschlauch während des Ein- und Austeleskopierens des Hauptauslegers von einer Schlauchtrommel abwickelbar beziehungsweise auf diese aufwickelbar ist, der Hydraulikschlauch in mehreren Lagen auf eine Schlauchtrommel nebeneinander und übereinander aufwickelbar ist und die Schlauchtrommel am Grundkasten angeordnet ist. Das Prinzip der vorliegenden Erfindung kann umschrieben werden, als einen herkömmlichen doppelt wirkenden hydraulischen Differentialzylinder überwiegend bis vollständig nach Art eines einfach wirkenden hydraulischen Differentialzylinders zu betreiben, um das Ziel zu erreichen, auf die Verwendung von zwei parallel verlaufenden Hydraulikschläuchen, insbesondere von Zwillingsschläuchen, zur Versorgung des Hydraulikzylinders mit Hydraulikflüssigkeit zu verzichten. Der dann nur einfache Hydraulikschlauch baut kleiner und ist einfacher zu wickeln, so dass eine zugehörige Schlauchtrommel entsprechend kleiner und einfacher gebaut werden kann. Der einfache Hydraulikschlauch ist zu verstehen als ein Hydraulikschlauch, der nur einen Strömungskanal für Hydraulikflüssigkeit aufweist und somit in zeitlicher Hinsicht gesehen die Hydraulikflüssigkeit durch den Strömungskanal entweder zu dem Wippzylinder hinströmt oder von dem Wippzylinder wegströmt. Auch könnte gesagt werden, dass die Hydraulikflüssigkeit durch den Strömungskanal entweder zu dem Wippzylinder ausschließlich hinströmt oder von dem Wippzylinder ausschließlich wegströmt und somit in zeitlicher Hinsicht nur jeweils in einer der beiden Strömungsrichtungen betrieben wird. Somit ist auch selbstverständlich, dass ein Zwillingsschlauch oder ein Hydraulikschlauch mit mehr als zwei Strömungskanälen in erfinderischer Weise betrieben werden könnte, wenn die einzelnen Strömungskanäle parallel und nur in einer gemeinsamen Strömungsrichtung durchströmt werden. Bei derartigen Schläuchen könnte dann der vorbeschriebene Wickelvorteil wegfallen.A mobile crane with a main boom and with a main boom extension articulated to the main boom and luffing by means of at least one luffing cylinder, the luffing cylinder being connected to a hydraulic hose in such a way that the hydraulic fluid either flows towards the luffing cylinder or flows away from the luffing cylinder, the main boom being telescopic is and consists of a base box and further telescopic sections arranged in it, the luffing cylinder being connected to the hydraulic hose with a single flow channel for the supply of hydraulic fluid, the hydraulic hose is improved according to the invention in that the hydraulic hose is guided along the main boom While the main boom is being telescoped in and out of a hose reel, it can be unwound or wound onto it, the hydraulic hose in several layers on a hose reel next to one another r and can be wound up one above the other and the hose reel is arranged on the base box. The principle of the present invention can be described as operating a conventional double-acting hydraulic differential cylinder predominantly to completely in the manner of a single-acting hydraulic differential cylinder in order to achieve the goal of using two parallel hydraulic hoses, in particular of No twin hoses to supply the hydraulic cylinder with hydraulic fluid. The then only simple hydraulic hose is smaller and easier to wind, so that an associated hose reel can be built correspondingly smaller and simpler. The simple hydraulic hose is to be understood as a hydraulic hose which has only one flow channel for hydraulic fluid and thus, in terms of time, the hydraulic fluid either flows through the flow channel to the luffing cylinder or flows away from the luffing cylinder. It could also be said that the hydraulic fluid either flows exclusively towards the luffing cylinder through the flow channel or exclusively flows away from the luffing cylinder and is therefore only operated in one of the two flow directions in terms of time. It goes without saying that a twin hose or a hydraulic hose with more than two flow channels could be operated in an inventive manner if the flow through the individual flow channels is parallel and only in a common flow direction. With such hoses, the previously described winding advantage could then be omitted.
Vorteilhaft weist der Hydraulikschlauch einen runden Querschnitt auf, wodurch insbesondere ein Aufwickeln des Hydraulikschlauchs vereinfacht ist.The hydraulic hose advantageously has a round cross section, which in particular simplifies winding up the hydraulic hose.
Der Kerngedanke der vorliegenden Erfindung besteht somit darin, den Wippzylinder zum Wippen der Hauptauslegerverlängerung relativ zum Hauptausleger über einen Strömungskanal mit Hydraulikflüssigkeit, insbesondere Hydrauliköl, zu beaufschlagen und für die Rückstellbewegung des Wippzylinders überwiegend das Eigengewicht der Hauptauslegerverlängerung beziehungsweise Federkräfte, insbesondere für ein Abwinkeln aus einer steilen 0°-Stellung der Hauptauslegerverlängerung, zu verwenden.The core idea of the present invention is thus to apply hydraulic fluid, in particular hydraulic oil, to the luffing cylinder for luffing the main boom extension relative to the main boom via a flow channel, and for the return movement of the luffing cylinder, predominantly the dead weight of the main boom extension or spring forces, in particular for angling from a steep one 0 ° position of the main boom extension, to be used.
Erfindungsgemäß kann somit der Wippzylinder an einen Hydraulikschlauch mit einem einzigen Strömungskanal zur Versorgung mit Hydraulikflüssigkeit angeschlossen sein. Die Hydraulikflüssigkeit fließt in dem Hydraulikschlauch hin und zurück. Der Hydraulikschlauch ist entlang des Hauptauslegers, insbesondere über Schlauchführungen, geführt.According to the invention, the luffing cylinder can thus be connected to a hydraulic hose with a single flow channel for supplying hydraulic fluid. The hydraulic fluid flows back and forth in the hydraulic hose. The hydraulic hose is guided along the main boom, in particular via hose guides.
In einer bevorzugten Ausgestaltung der Erfindung weist der Wippzylinder einen Stangenraum und einen Zylinderraum auf, wobei entweder nur der Stangenraum oder nur der Zylinderraum mit dem Hydraulikschlauch verbunden ist. Der nicht mit dem Hydraulikschlauch verbundene Zylinderraum beziehungsweise Stangenraum ist dabei vorteilhafter Weise drucklos mit der Atmosphäre verbunden.In a preferred embodiment of the invention, the luffing cylinder has a Rod space and a cylinder space, either only the rod space or only the cylinder space is connected to the hydraulic hose. The cylinder space or rod space that is not connected to the hydraulic hose is advantageously connected to the atmosphere without pressure.
In einer besonders bevorzugten Ausgestaltung der Erfindung weist der Wippzylinder einen Stangenraum und einen Zylinderraum auf, wobei entweder nur der Stangenraum oder nur der Zylinderraum mit dem Hydraulikschlauch verbunden ist und der nicht mit dem Hydraulikschlauch verbundene Zylinderraum beziehungsweise Stangenraum mit einem Druckmedium, vorzugsweise mit einem Gas, besonders bevorzugt mit Stickstoff, gefüllt ist.In a particularly preferred embodiment of the invention, the luffing cylinder has a rod space and a cylinder space, wherein either only the rod space or only the cylinder space is connected to the hydraulic hose and the cylinder space or rod space not connected to the hydraulic hose is connected to a pressure medium, preferably a gas, is particularly preferably filled with nitrogen.
In einer weiteren Ausgestaltung dieser Erfindung ist es gleichsam möglich als Druckmedium neben Gas beziehungsweise Stickstoff auf einer Zylinderseite des Wippzylinders eine Hydraulikflüssigkeit, insbesondere Hydrauliköl vorzusehen, die dann mit einem Gasspeicher in Verbindung steht. Auch die Verwendung einer mechanischen Feder auf der Zylinderseite des Wippzylinders ist denkbar.In a further embodiment of this invention, it is also possible, as it were, to provide a hydraulic fluid, in particular hydraulic oil, as a pressure medium in addition to gas or nitrogen on a cylinder side of the luffing cylinder, which is then connected to a gas reservoir. The use of a mechanical spring on the cylinder side of the luffing cylinder is also conceivable.
In vorteilhafter Weise ist zudem vorgesehen, dass dem Wippzylinder ein Ventil zugeordnet ist, über das ein Ausströmen der Hydraulikflüssigkeit aus dem Wippzylinder und somit ein Abwinkeln der Hauptauslegerverlängerung steuerbar ist.In an advantageous manner, it is also provided that the luffing cylinder is assigned a valve via which an outflow of the hydraulic fluid from the luffing cylinder and thus an angle of the main boom extension can be controlled.
Zudem kann vorteilhaft vorgesehen sein, dass der Wippzylinder als Zugzylinder oder als Druckzylinder ausgebildet ist.In addition, it can advantageously be provided that the luffing cylinder is designed as a pulling cylinder or as a pressure cylinder.
In besonders vorteilhafter Weise ist der Wippzylinder einseitig wirkend. Durch die Beaufschlagung nur einer Seite des Wippzylinders mit Hydraulikflüssigkeit kann folglich auf einen aufwendigeren und somit teureren Zwillingsschlauch verzichtet werden, der beim Aufwickeln tordieren kann, wodurch ein Aufwickelradius ungewollt vergrößert wird.In a particularly advantageous manner, the luffing cylinder acts on one side. By acting on only one side of the luffing cylinder with hydraulic fluid, it is consequently possible to dispense with a more complex and thus more expensive twin hose, which can twist when it is wound up, as a result of which a winding radius is unintentionally increased.
In einer besonders vorteilhaften Ausgestaltung der Erfindung weist der Wippzylinder einen Stangenraum und einen Zylinderraum auf, wobei der Stangenraum und der Zylinderraum mit dem Hydraulikschlauch verbunden werden können. Dem Wippzylinder sind ein Umschaltventil und ein Blasenspeicher zugeordnet. In vorteilhafter Weise ist im Zylinderraum die Druckfläche, auf die eine Hydraulikflüssigkeit einwirken kann gegenüber der Druckfläche im Stangenraum um die Angriffsfläche einer Zylinderstange vergrößert, so dass folglich der Zylinderraum mit Hydraulikflüssigkeit beaufschlagt wird und Hydraulikflüssigkeit aus dem Stangenraum hinausfließen kann. Der Stangenraum kann über das Umschaltventil mit dem Zylinderraum oder mit einem Blasenspeicher verbunden werden, welcher mit Hydraulikflüssigkeit und Gas befüllt ist. In dieser Ausgestaltung wird der Wippzylinder in der Art eines einseitig wirkenden Wippzylinders über einen einzigen Strömungskanal mit Hydraulikflüssigkeit beaufschlagt. Somit kann auch hier auf einen aufwendigen und unvorteilhaften Zwillingsschlauch verzichtet werden.In a particularly advantageous embodiment of the invention, the luffing cylinder has a rod space and a cylinder space, wherein the rod space and the cylinder space can be connected to the hydraulic hose. A switch valve and a bladder accumulator are assigned to the rocker cylinder. In Advantageously, the pressure surface in the cylinder space, on which hydraulic fluid can act, is increased by the contact surface of a cylinder rod compared to the pressure surface in the rod space, so that consequently hydraulic fluid is applied to the cylinder space and hydraulic fluid can flow out of the rod space. The rod space can be connected to the cylinder space or to a bladder accumulator, which is filled with hydraulic fluid and gas, via the switching valve. In this embodiment, hydraulic fluid is applied to the luffing cylinder in the manner of a luffing cylinder acting on one side via a single flow channel. An expensive and disadvantageous twin hose can thus also be dispensed with here.
Grundsätzlich unterscheidet man bei Fahrzeugkranen zwischen Teleskopkranen und Gittermastkranen. Teleskopkrane zeichnen sich dadurch aus, dass der Kranausleger aus mehreren teleskopartig ineinander verschiebbaren Teleskopschüssen besteht, wohingegen bei einem Gittermastkran der Ausleger aus mehreren starr miteinander verbundenen Gittermastelementen besteht. Im vorliegenden Fall wird ein Fahrzeugkran als Mobilkran mit Teleskopausleger oder als Raupenkran verstanden.In the case of mobile cranes, a basic distinction is made between telescopic cranes and lattice boom cranes. Telescopic cranes are characterized by the fact that the crane boom consists of several telescopic sections that can be telescoped into one another, whereas in a lattice boom crane the boom consists of several rigidly interconnected lattice mast elements. In the present case, a mobile crane is understood as a mobile crane with a telescopic boom or as a crawler crane.
In einer erfindungsgemäßen Ausgestaltung des Fahrzeugkrans ist der Hauptausleger teleskopierbar und besteht aus einem Grundkasten und weiteren darin angeordneten, ein- und austeleskopierbaren Teleskopschüssen. Der Hydraulikschlauch zur Versorgung des Wippzylinders mit hydraulischer Energie ist während des Ein- und Austeleskopierens des Hauptauslegers von einer Schlauchtrommel abwickelbar beziehungsweise auf diese aufwickelbar. Insbesondere ist der Hydraulikschlauch in mehreren Lagen auf die Schlauchtrommel analog einer Seil- oder Kabeltrommel nebeneinander und übereinander aufwickelbar.In an embodiment of the vehicle crane according to the invention, the main boom is telescopic and consists of a basic box and further telescopic sections which are arranged in it and which can be telescoped in and out. The hydraulic hose for supplying the luffing cylinder with hydraulic energy can be unwound from or wound onto a hose drum while the main boom is being telescoped in and out. In particular, the hydraulic hose can be wound onto the hose drum in several layers, like a rope or cable drum, next to one another and one above the other.
In erfindungsgemäßer Weise ist die Schlauchtrommel an dem Hauptausleger, insbesondere an dem Grundkasten, angeordnet.According to the invention, the hose reel is arranged on the main boom, in particular on the base box.
Durch die Ausführung des einen Hydraulikschlauchs als einziger Strömungskanal und das nicht nur spiralförmige Wickeln ist die Schlauchtrommel in ihrem Durchmesser reduziert, so dass vorteilhaft eine Anordnung am Grundkasten des Hauptauslegers auch während des Transports möglich ist. Auf eine aufwendige Montage und Demontage für den Transport kann verzichtet werden.By designing one hydraulic hose as a single flow channel and not just spiraling the winding, the diameter of the hose reel is reduced, so that an arrangement on the base box of the main boom is advantageously possible even during transport. There is no need for complex assembly and disassembly for transport.
Vorteilhaft ist vorgesehen, dass der Fahrzeugkran einen Unterwagen und einen hierauf drehbar gelagerten Oberwagen aufweist.It is advantageously provided that the mobile crane has an undercarriage and an uppercarriage rotatably mounted thereon.
Ein Ausführungsbeispiel der Erfindung wird anhand der nachfolgenden Beschreibung näher erläutert. Es zeigen:
-
Figur 1 eine Ansicht eines Mobilkrans mit einem Hauptausleger und einer Hauptauslegerverlängerung jeweils in einer abgelegten Stellung und in einer aufgerichteten Stellung, -
eine Detailansicht des in derFigur 2Figur 1 markierten Ausschnitts Z aus dem Bereich der Ankopplung der Hauptauslegerverlängerung an den Hauptausleger, -
Figur 3 einen schematischen Hydraulikschaltplan in Bezug auf den Wippzylinder, -
Figur 4a einen schematischen Hydraulikschaltplan in Bezug auf den Wippzylinder mit einem Blasenspeicher mit einem Umschaltventil in einer ersten Stellung, -
Figur 4b den Hydraulikschaltplan gemäßFigur 4a mit einem Umschaltventil in einer zweiten Stellung, -
Figur 4c einen schematischen Hydraulikschaltplan gemäßFigur 4a mit einem Umschaltventil in einer dritten Stellung und -
einen schematischen Hydraulikschaltplan gemäßFigur 4dFigur 4a mit einem Umschaltventil in einer vierten Stellung.
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Figure 1 a view of a mobile crane with a main boom and a main boom extension each in a stored position and in an upright position, -
Figure 2 a detailed view of the in theFigure 1 marked section Z from the area of the coupling of the main boom extension to the main boom, -
Figure 3 a schematic hydraulic circuit diagram in relation to the luffing cylinder, -
Figure 4a a schematic hydraulic circuit diagram in relation to the luffing cylinder with a bladder accumulator with a switching valve in a first position, -
Figure 4b the hydraulic circuit diagram according toFigure 4a with a switch valve in a second position, -
Figure 4c a schematic hydraulic circuit diagram according toFigure 4a with a switch valve in a third position and -
Figure 4d a schematic hydraulic circuit diagram according toFigure 4a with a switch valve in a fourth position.
Die
Auch ist in der
Die
Erfindungsgemäß ist der Wippzylinder 14 in der Weise an einen Hydraulikschlauch 13 angeschlossen, dass die Hydraulikflüssigkeit in zeitlicher Hinsicht gesehen entweder zu dem Wippzylinder 14 hinströmt oder von dem Wippzylinder 14 wegströmt, so dass nur eine hydraulische Zuleitung mit einem einzigen Strömungskanal erforderlich ist. Daher ist der Hydraulikschlauch 13 nicht als Zwillingsleitung, sondern nur als Einzelleitung ausgebildet. Dieser als Einzelleitung ausgebildete Hydraulikschlauch 13 wird auf der Schlauchtrommel 12 mehrlagig und nicht nur spiralförmig auf- und abgewickelt. Bevorzugt hat die Schlauchtrommel 12 hierfür Schlauchrillen und Bordscheiben an den Rändern der Schlauchtrommel 12, um ein geordnetes Wickeln zu unterstützen. Im aufgewickelten Zustand verläuft die Einzelleitung des Hydraulikschlauchs 13 somit in jeder Lage nebeneinander und in Lagen übereinander. Mit einer sogenannten Mehrlagentechnik mit vorzugsweise paralleler Rillung auf der Schlauchtrommel kann der Hydraulikschlauch 13 geordnet viellagig übereinander aufgewickelt werden. Das mehrlagige Spulen wird ermöglicht durch spezielle in den Körper der Schlauchtrommel eingefräste Seilrillen, die abschnittsweise parallel zur Außenbordscheibe verlaufen und über sogenannte sowie um etwa 120° bis 180° versetzte Kreuzungsgebiete verbunden sind. Die Kreuzungsgebiete gewährleisten die erforderliche Steigung pro Umdrehung der Trommel und sorgen für ein konstantes und pyramidenförmiges Schlauchwickeln.According to the invention, the luffing
Die
Nachfolgend wird auf der Grundlage der
Die Befüllung des Zylinderraums 14d mit komprimiertem Gas oder unter Druck stehendem Hydrauliköl führt zu einer Vorspannung des Wippzylinders 14, so dass ein schnelleres Abwippen der Hauptauslegerverlängerung 5 möglich ist. Auch ist es vorteilhaft möglich, mit der Vorspannung und dem Öldruck im Stangenraum 14c den Hydraulikzylinder 14 auch ohne äußere Kräfte ein- und auszufahren, so dass beispielsweise eine Verbolzungsposition während des Rüstens angefahren werden kann.The filling of the
Grundsätzlich ist es auch möglich, die Schlauchtrommel 12 am Oberwagen 3 anzuordnen. Es kann auch vorgesehen werden, dass die Hydraulikleitung 13a an einer Zylinderseite des Wippzylinders 14 angeschlossen ist. Auch kann der Wippzylinder 14 anstatt als Zugzylinder als Druckzylinder betrieben werden, wobei dann der Stangenraum und der Zylinderraum getauscht sind und der Zylinderraum mit Hydraulikflüssigkeit und der Stangenraum mit Druckmedium befüllt sind. Alternativ kann der Hydraulikschlauch 13 direkt an den Wippzylinder 14 ohne die Hydraulikleitung 13a angeschlossen werden.In principle, it is also possible to arrange the
Darüber hinaus ist in den
Die
Zum Abwippen der Hauptauslegerverlängerung 5 um einen kleinen Winkel, insbesondere kleiner 10°, vorzugsweise kleiner 5°, besonders bevorzugt kleiner 2°, aus einer Steilstellung, insbesondere der 0°-Stellung, heraus, befindet sich das Umschaltventil 23 in der in
Für ein weiteres Abwippen der Hauptauslegerverlängerung 5 wird das Umschaltventil 23 in die zweite Stellung bewegt, die in dem schematischen Hydraulikschaltplan in
Ein schematischer Hydraulikschaltplan für den entgegengesetzten Vorgang, nämlich ein Aufwippen der Hauptauslegerverlängerung 5, ist in
In der
Aus den
Alternativ ist es in einer nicht dargestellten Stellung des Umschaltventils 23 möglich, zum Abwinkeln der Hauptauslegerverlängerung 5 um einen kleinen Winkel aus einer Steilstellung, insbesondere der 0°-Stellung, heraus, nur den Zylinderraum 14d mit dem Hydraulikschlauch 13, beziehungsweise der Hydraulikleitung 13a zu verbinden. Der Stangenraum 14c ist in dieser Ausführung mit dem Blasenspeicher 22 verbunden. Der unter einem Systemdruck der Hydraulikanlage stehende Hydraulikschlauch 13 ist über das Umschaltventil 23 und die erste Hydraulikleitung 13a an den Zylinderraum 14d angeschlossen. Nun fließt Hydraulikflüssigkeit, insbesondere Hydrauliköl, zum Wippzylinder 14. Hierbei wird der Zylinderraum 14d mit Hydraulikflüssigkeit gefüllt und Hydraulikflüssigkeit fließt aus dem Stangenraum 14c hinaus in den Blasenspeicher 22. Insgesamt resultiert hieraus ein Abwippen der Hauptauslegerverlängerung 5 um einen kleinen Winkel, insbesondere kleiner 10°, vorzugsweise kleiner 5°, besonders bevorzugt kleiner 2°, aus der Steilstellung heraus. Diese kleine Abwippbewegung ist ausreichend, damit der Wippzylinder 14 eindeutig mit einem größeren Anteil des Gewichts der Hauptauslegerverlängerung 5 belastet ist.Alternatively, in a position of the switching
Im weiteren Verlauf des Abwippens und späteren Aufwippens wird das Umschaltventil 23 in analoger Weise zu den in den
Des Weiteren kann der erfindungsgemäße Wippzylinder 14 in einer nicht dargestellten Ausführungsform mit einem entsprechend angepassten Umschaltventil 23 auch zum Rüsten des Fahrzeugkrans 1 verwendet werden. Beim Rüsten des Fahrzeugkrans 1 führt der Wippzylinder 14 nur kleine Ausrichtbewegungen, insbesondere im Bereich von 0 bis 100 mm, bevorzugt von 0 bis 50 mm, besonders bevorzugt von 0 bis 5 mm, ohne Kraft aus. Ohne Kraft bedeutet im vorliegenden Fall, dass die Kolbenstange 14b beziehungsweise das Gehäuse des Wippzylinders 14 nicht an der Hauptauslegerverlängerung 5 beziehungsweise an dem Fuß der Hauptauslegerverlängerung 5a angelenkt ist, sondern frei ist, um ein Ausrichten des Wippzylinders 14 vor dem Verbolzen mit der Hauptauslegerverlängerung 5a zu ermöglichen. Um die Kolbenstange 14b aus- beziehungsweise einzufahren, wird der Zylinderraum 14d beziehungsweise der Stangenraum 14c über das Umschaltventil 23 mit dem Hydraulikschlauch 13 in Verbindung gebracht und hierrüber mit Hydraulikflüssigkeit beaufschlagt. Der mit Hydraulikflüssigkeit gefüllte Stangenraum 14c beziehungsweise Zylinderraum 14d ist über das Umschaltventil mit dem Blasenspeicher 22 verbunden, so dass die aus dem Stangenraum 14c beziehungsweise Zylinderraum 14d verdrängte Hydraulikflüssigkeit in den Blasenspeicher 22 strömen kann. Der Blasenspeicher 22 ersetzt somit in begrenztem Umfang die nicht vorhandene rückführende Hydraulikleitung. Überschüssige Hydraulikflüssigkeit im Blasenspeicher 22 kann über eine geeignete Stellung des Umschaltventils 23, welches den Blasenspeicher 22 mit dem Hydraulikschlauch 13 verbindet, über den Hydraulikschlauch 13 zum Behälter 21 abgelassen werden.Furthermore, in an embodiment not shown, the luffing
- 11
- MobilkranMobile crane
- 22
- UnterwagenUndercarriage
- 33
- OberwagenSuperstructure
- 44th
- HauptauslegerMain boom
- 4a4a
- Kopf des HauptauslegersMain boom head
- 55
- HauptauslegerverlängerungMain boom extension
- 5a5a
- Fuß der HauptauslegerverlängerungMain boom extension base
- 66th
- GrundkastenBasic set
- 77th
- erster Teleskopschussfirst telescopic shot
- 88th
- zweiter Teleskopschusssecond telescopic shot
- 99
- dritter Teleskopschussthird telescopic shot
- 1010
- vierter Teleskopschussfourth telescopic shot
- 1212th
- SchlauchtrommelHose reel
- 1313th
- HydraulikschlauchHydraulic hose
- 13a13a
- erste Hydraulikleitungfirst hydraulic line
- 13b13b
- zweite Hydraulikleitungsecond hydraulic line
- 1414th
- WippzylinderLuffing cylinder
- 14a14a
- Gehäusecasing
- 14b14b
- KolbenstangePiston rod
- 14c14c
- StangenraumPole space
- 14d14d
- ZylinderraumCylinder space
- 14e14e
- Kolbenpiston
- 1515th
- SchlauchführungHose guide
- 1616
- AufrichtzylinderErecting cylinder
- 1717th
- VentilValve
- 1818th
- GasspeicherGas storage
- 1919th
- Pumpepump
- 2020th
- SteuerungsventilControl valve
- 2121
- Behältercontainer
- 2222nd
- BlasenspeicherBladder accumulators
- 2323
- UmschaltventilChangeover valve
- AA.
- WippachseLuffing axis
- DD.
- DrehachseAxis of rotation
- ZZ
- AusschnittCutout
- ww
- WippwinkelLuffing angle
- II.
- abgelegte Stellungabandoned position
- IIII
- aufgerichtete Stellungupright position
- >>
- Fließrichtung der Hydraulikflüssigkeit zum Behälter (rechts)Direction of flow of the hydraulic fluid to the container (right)
- <<
- Fließrichtung der Hydraulikflüssigkeit von der Pumpe (links)Direction of flow of hydraulic fluid from the pump (left)
Claims (9)
- Vehicle crane (1) comprising a main boom (4) and comprising a main boom extension (5) which is articulated on the main boom (4) and can be luffed by means of at least one luffing cylinder (14), the luffing cylinder (14) being connected to a hydraulic hose (13) in such a way that the hydraulic fluid either flows towards the luffing cylinder (14) or flows away from the luffing cylinder (14), the main boom (4) being telescopic and consisting of a base box (6) and further telescopic sections (7, 8, 9, 10) which are arranged therein and can be telescoped in and out, the luffing cylinder (14) being connected to the hydraulic hose (13) by means of a single flow channel for the supply of hydraulic fluid, it being possible to unwind the hydraulic hose (13) from a hose reel (12) or wind it thereon during the telescoping in and out of the main boom (4), characterised in that the hydraulic hose (13) is guided along the main boom (4), the hydraulic hose (13) can be wound onto the hose reel (12) in multiple layers side-by-side and one above the other and the hose reel (12) is arranged on the base box (6).
- Vehicle crane (1) according to claim 1, characterised in that the hydraulic hose (13) has a round cross section.
- Vehicle crane (1) according to claim 1 or claim 2, characterised in that the luffing cylinder (14) has a rod chamber (14c) and a cylinder chamber (14d), the rod chamber (14c) or cylinder chamber (14d) is connected to the hydraulic hose (13) and the cylinder chamber (14d) or rod chamber (14c) not connected to the hydraulic hose (13) is connected to the atmosphere without pressure.
- Vehicle crane (1) according to either claim 1 or claim 2, characterised in that the luffing cylinder (14) has a rod chamber (14c) and a cylinder chamber (14d), the rod chamber (14c) or cylinder chamber (14d) is connected to the hydraulic hose (13) and the cylinder chamber (14d) or rod chamber (14c) not connected to the hydraulic hose (13) is filled with a pressure medium, preferably with a gas, particularly preferably nitrogen.
- Vehicle crane (1) according to any of the preceding claims, characterised in that the luffing cylinder (14) is associated with a valve (17) via which an outflow of the hydraulic fluid from the luffing cylinder (14) can be controlled.
- Vehicle crane (1) according to any of the preceding claims, characterised in that the luffing cylinder (14) is designed as a traction cylinder or a pressure cylinder.
- Vehicle crane (1) according to any of the preceding claims, characterised in that the luffing cylinder (14) acts unilaterally.
- Vehicle crane (1) according to claim 1 or claim 2, characterised in that the luffing cylinder (14) has a rod chamber (14c) and a cylinder chamber (14d), the rod chamber (14c) and the cylinder chamber (14d) are connected to the hydraulic hose (13) via a switching valve (23) and the cylinder chamber (14d) can be brought into connection with a bladder accumulator (22) via the switching valve (23).
- Vehicle crane (1) according to any of the preceding claims, characterised in that the vehicle crane (1) has an undercarriage (1) and an upper carriage (3) rotatably mounted thereon.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202018100059.4U DE202018100059U1 (en) | 2018-01-05 | 2018-01-05 | Mobile crane with a hydraulically tiltable main boom extension |
PCT/EP2019/050108 WO2019134943A1 (en) | 2018-01-05 | 2019-01-03 | Vehicle crane having a main boom extension that can be luffed hydraulically |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3735388A1 EP3735388A1 (en) | 2020-11-11 |
EP3735388B1 true EP3735388B1 (en) | 2021-07-21 |
Family
ID=61082593
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19700133.2A Active EP3735388B1 (en) | 2018-01-05 | 2019-01-03 | Mobile crane with an hydraulic luffing extension boom |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3735388B1 (en) |
DE (1) | DE202018100059U1 (en) |
WO (1) | WO2019134943A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102019105971A1 (en) * | 2019-03-08 | 2020-09-10 | Liebherr-Werk Biberach Gmbh | Crane and cable drum therefor |
JP2022084003A (en) * | 2020-11-25 | 2022-06-06 | タダノ デマグ ゲーエムベーハー | Telescopic jib system of mobile crane with basic telescopic jib and additional telescopic jib and corresponding method |
CN112225092B (en) * | 2020-12-15 | 2021-08-24 | 新乡市奔象机械设备有限公司 | Self-loading and unloading type auxiliary arm mounting mechanism of automobile crane |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE240657C (en) | 1909-02-08 | |||
JPS6345667A (en) | 1987-08-10 | 1988-02-26 | Hitachi Ltd | Microprocessor |
DE9013488U1 (en) * | 1990-09-25 | 1990-12-06 | Liebherr-Werk Ehingen Gmbh, 7930 Ehingen, De | |
WO2005021415A1 (en) | 2003-08-22 | 2005-03-10 | Terex-Demag Gmbh & Co. Kg | Mobile crane jib with self-sufficient hydraulic unit disposed thereon |
DE202014006861U1 (en) * | 2013-08-23 | 2014-12-01 | Hohenloher Spezial-Maschinenbau GmbH & Co. KG | working machine |
DE102013020542B4 (en) * | 2013-12-12 | 2016-06-16 | Tadano Faun Gmbh | crane |
-
2018
- 2018-01-05 DE DE202018100059.4U patent/DE202018100059U1/en active Active
-
2019
- 2019-01-03 EP EP19700133.2A patent/EP3735388B1/en active Active
- 2019-01-03 WO PCT/EP2019/050108 patent/WO2019134943A1/en active Search and Examination
Also Published As
Publication number | Publication date |
---|---|
EP3735388A1 (en) | 2020-11-11 |
DE202018100059U1 (en) | 2018-01-16 |
WO2019134943A1 (en) | 2019-07-11 |
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