EP1072554B1 - Crane with telescopic boom - Google Patents

Description

The invention relates to a crane with a telescopic boom, the one Basic boom with boom linkage telescopic shots in their respective extended and retracted positions are locked by locking bolts and after releasing the locking bolt connections with a one-step hydraulic piston-cylinder unit, which ends at the boom link is attached, can be extended and retracted by two strokes, each shot to be retracted or retracted once with the inner and once with the outer End portion of the movable part of the piston-cylinder unit is coupled.

From DE 198 24 671 A1 a telescopic boom of this type is known, in which either the piston rod or cylinder of the piston-cylinder unit on the boom link is articulated and the respective movable part of the piston-cylinder unit, namely the cylinder and the piston rod on hers Provide inner and outer ends with a locking and locking unit are that can be coupled with recesses of the telescopic shots. The locking and locking unit is located on the boom link attached cylinder to the piston rod, this is at its front End with a guide and traction device running parallel to the cylinder provided with a locking and locking unit at its inner end wearing.

The known telescopic boom has a relatively complex Construction on that at the inner and outer ends of the cylinder, respectively or at the outer end of the piston rod and at the inner end of a this connected guiding and pulling device securing and locking units are arranged, which must therefore be duplicated.

The object of the invention is therefore to provide a crane with a telescopic boom to create specified type, which has a simpler structure.

According to a first embodiment, this object is achieved according to the invention solved that when attached to the boom linkage piston rod on the cylinder a sliding ring or a sliding sleeve with a coupling device for coupling the shots, the one or both with the inner and the outer end region of the cylinder can be locked.

The sliding coupling device can consist of two opposite one another extendable and retractable pistons exist in corresponding recesses or insert holes in the shots and are known from EP 0 661 234 A1 are. The bolt connections that lock the individual shots together can also be designed as described in EP 0 661 234 A1 is. Furthermore, the displaceable ring or the bushing, which is the coupling device also carries with a device for unlocking the individual shots locking bolt connections are provided, as is also described in EP 0 661 234 A1.

The telescopic boom according to the invention enables the individual shots in extend and retract two strokes so that piston cylinder units with lower weight can be used, which is also less sensitive to kinking exhibit. The sliding ring or the sliding bush on the cylinder, which can only partially encompass the cylinder, is in the end positions locked to the cylinder by known locking means. To effect the lock and to release the lock and to extend and retract the coupling bolts and for moving the bolt connections of the Shuttles that solve one another are, for example, hydraulic cylinders provided, the sliding ring in a known manner with supply lines is provided.

The locking unit can also be supplied by an additional hydraulic cylinder take place at the same time the displacement of the locking unit serves on the cylinder jacket tube.

In order to be able to extend and retract the shots in two strokes, they point in their middle areas locking holes in which the locking bolt connections of those slidably guided shots in a half-extended Grasp condition. The distance of the locking holes of each Shots from the middle holes to the inner and outer holes corresponds to the displacement length of the ring or the socket on the Cylinder.

According to another embodiment, the object is achieved according to the invention solved that with the cylinder attached to the boom linkage with the outer End of the piston rod a tube concentric with the cylinder or to this parallel guides are attached, which surround the cylinder between them, and that on the tube or the struts a sliding ring or a sliding piece are guided with a coupling device which with the inner and outer End regions of the tube or the guides can be coupled. Here are the ring or the sliding piece according to the first embodiment again with Provide devices for releasing the locking bolt connections. Farther the ring or the sliding piece are provided with an energy supply, which can consist of carried lines.

The oil supply for the locking unit and the displacement unit can also by means of telescopic pipes inside the cylinder or via hose lines respectively.

Is the ring carrying the coupling device or the bushing or the sliding piece not during the movement of the movable part of the piston-cylinder unit coupled with a shot, it is necessary to get this to the other end to move the movable part and lock it again. To this Purpose is provided in a further embodiment of the invention, the device the ring or the sliding piece with the coupling device from the outer Position returns to the inner position or vice versa.

The cylindrical jacket tube or that enclosing it are expedient Tube or the guides at their outer and inner end portions with coils, Provide protrusions or depressions with which the rings, bushings or sliding pieces e.g. can be releasably locked by claws or bolts.

The guides can be provided with coupling devices with which the Sliding piece is releasably connectable by mating coupling devices.

Fig. 1 bis 6

einen erfindungsgemäßen Teleskopausleger mit an dem Auslegeranlenkstück befestigter Kolbenstange in verschiedenen Ausfahrstellungen der Schüsse und des Zylinders in schematischer Darstellung,

Fig. 7 bis 10

entsprechende Darstellungen des erfindungsgemäßen Teleskopauslegers mit an dem Auslegeranlenkstück befestigtem Zylinder,

Fig. 11 bis 14

Schnitte durch einen erfindungsgemäßen Teleskopausleger in unterschiedlichen Stellungen, bei dem die die Kupplungseinrichtung tragende Buchse auf dem Zylindermantelrohr durch die Kolbenstange eines Hilfszylinders verschieblich ist, und

Fig. 15

eine schematische Schnittdarstellung des die einzelnen Schüsse verfahrenden Hauptzylinders, der mit einem Hilfszylinder zum Verschieben der die Kupplungseinrichtung tragenden Buchse versehen ist.

Embodiments of the invention are explained below with reference to the drawing. In this shows

1 to 6

a telescopic boom according to the invention with a piston rod attached to the boom linkage in different extended positions of the shots and the cylinder in a schematic representation,

7 to 10

corresponding representations of the telescopic boom according to the invention with the cylinder attached to the boom linkage,

11 to 14

Cuts through a telescopic boom according to the invention in different positions, in which the bushing carrying the coupling device is displaceable on the cylinder jacket tube through the piston rod of an auxiliary cylinder, and

Fig. 15

is a schematic sectional view of the master cylinder moving the individual shots, which is provided with an auxiliary cylinder for displacing the bushing carrying the coupling device.

In the embodiment according to FIGS. 1 to 6, the piston rod 1 is the hydraulic one Piston cylinder unit 1, 2 on the boom link 3 of the basic boom 4 attached, which forms the outer shot of the telescopic boom.

In the illustrated embodiment, only two are from the basic boom 4 Shots 5, 6 can be pushed out and retracted into them by conventional locking bolts 7, 8 are locked to one another and to the basic boom 4. On the Cylinder 2 is a sleeve 9 rotatable in the axial direction, which on its is provided at both ends with claws 10, which either out of the socket 9 1 and 2 evidently lock with an annular collar 11 of the cylinder 2, which is located on the inner end region of the cylinder, or in the 3 and 4 evident manner with an annular collar 12, which is at the end or Bottom area of the cylinder 2 is located.

The socket 9 is in the manner known from EP 0 661 234 A1 on opposite Provided on the sides with hydraulically movable locking bolts the socket 9 each with the inner end of the shot to be pushed out can be locked so that the shot to be moved can be moved in two strokes can extend or retract, the socket once with the inner and once with the outer end of the cylinder is locked.

The socket 9 is also with a EP, for example 0 661 234 A1 known device for pulling the locking bolts 7, 8 provided those for coupling to the device with coupling pieces, for example Plates, provided and towards their extended locking position are loaded by springs.

The socket 9 is in a manner not shown with lines for power supply provided, which on the one hand lock and release the claws 10 and on the other hand the locking bolts for coupling the shots to the socket 9 and the device for pulling the bolts 7, 8 with energy, for example hydraulic oil, supply. The swiveling claws can be loaded by springs, so that they automatically move into their coupling positions via suitable slopes grab.

The individual steps for pushing the shots 5, 6 out of the basic boom 4 will now be explained with reference to FIGS. 1 to 6.

In Fig. 1, the shots 5, 6 with each other by the bolt 8 and the shot 5 with the basic boom 4 locked by the bolt 7. To eject the shot 6, the cylinder 2 to the inner shot 6 by side locking bolts the socket 5 coupled by the claws 10 with the inner collar 11 of the cylinder 2 is locked. After pulling the locking bolt 8 by the unlocking device on the collar 9, the cylinder 2 moves the Shot 6 in its 50% extended position, which can be seen from Fig. 2. In this position, the shot 6 is again through the locking bolt 8 with the Shot 5 locked, for this purpose a hole in its central area having. In this position, the claws on the inside are released and the cylinder 2 is in its retracted position shown in FIG. 3 retracted while the socket 9 with its side locking bolt the shot 6 remains locked, so that the bushing 9 inevitably on the cylinder is moved into the outer position, in which this by the claws 10 with the outer collar 12 of the cylinder 2 is locked. In this position the Locking bolt 8 released again, so that in the manner shown in Fig. 4 the shot 6 can be completely moved out of the shot 5. In the extended Position is the shot 5 in the manner shown in Fig. 5 again through the locking bolt 8 with the outer end region of the shot 5 locked. After releasing the side locking bolts, cylinder 2 move back into its retracted position shown in FIG. 5. Farther is also by a device, not shown, the socket 9 to the inner end of the cylinder 2 and locked there by the claws 10 with the collar 11. This device moving into the socket 9 can, for example, consist of a Cable, not shown, a gear drive, a friction wheel drive or one Pressure fluid piston-cylinder unit exist.

From the position shown in Fig. 5, the shot 5 is then in two strokes the basic boom 4 extended in a corresponding manner, the first extension stroke 6 can be seen.

As already stated, the invention can also be achieved in that the apparent from FIGS. 7 to 10, the cylinder 2 with the boom link 3 is connected. The piston rod 1 enters at its outer end Transverse yoke or a plate 20 to which a cage 22 is connected, the inner end is slidably guided on the cylinder 2 via a sliding piece. This Cage 20 can also consist of a tube or side struts that are on the cylinder 2 are guided. On the cage 22 is a socket or a sliding piece 23 slidably guided like the socket 9 after the Embodiment of FIGS. 1 to 6 with claws or locking devices for coupling to the inner or outer end area of the cage and with each other opposite bolts for coupling to the one to be pulled out or to be inserted and with a device for pulling the locking bolt 7, 8 is provided. The type of extension and retraction takes place at the embodiment of FIGS. 7 to 10 in a similar manner as in the embodiment 1 to 6, only with the difference that the socket or the sliding piece 23 with the inner or outer end of the relative to the Cylinder can be coupled by the piston rod 2 movable cage.

In both exemplary embodiments, the individual bolts are mechanical mutually locked so that the shots either with each other or the shot to be pushed out or retracted with the movable part of the piston-cylinder unit is locked.

From the telescopic boom according to the invention according to FIGS. 11 to 14 are from the boom articulation piece 30 four telescopic sections 31 to 34 telescopic. The piston rod 35 of the telescopic cylinder 36 is with the foot 37 of the Boom articulation shot 30 firmly connected. The telescopic cylinder 36 is with it End 38 superior lateral guides 39 provided in the outer Tail of the articulated shot and the telescoped shots in the usual Are guided and prevent rotation of the telescopic cylinder. On a transverse yoke 40 connecting the lateral guides 39 is an auxiliary cylinder 41 attached, the piston rod 42, the bushing 43 on the cylinder jacket tube of the telescopic cylinder 36 moves between the end positions, locked and solves again. The socket 43 carries the side locking bolts for coupling to the individual shots to be pushed out and retracted. Continue wearing the socket 43 is a coupling piece for coupling to the locking bolt 44 to 47 to lock the individual telescopic shots with each other and with the Auslegeranlenkschuß.

In Fig. 11, the auxiliary cylinder 41 via its piston rod 42 has the coupling device provided bushing 43 shifted inwards, in which the lateral Locking bolts are coupled to the inner shot 34 to be pushed out. After pulling and thus unlocking the locking bolt 47 can the inner shot over the telescopic cylinder 36 into its one shown in FIG move to the semi-extended position. Then the locking bolt 47 bolted to a central receiving bore of the shot 46, so that after the release of the lateral locking bolts used to move the telescopic shots the cylinder 36 is moved into its position shown in FIG. 13 can be. From this position, the inner telescopic section 34 is then by extending the telescopic cylinder again into its one shown in FIG. 14 move to extended position. In this is the inner telescopic shot 34 then locked again with the telescopic section 33 enclosing this. Then the side bolts are retracted and the telescopic cylinder 36 is in again for coupling the next telescopic shot 33 move its inner position, the auxiliary cylinder 41 by extending its Piston rod 42, the sleeve 43 at overtaking speed to the other end of the cylinder jacket tube moves, from which the piston rod from the telescopic cylinder 36 exits. The following telescopic shots are in corresponding Extended way.

A schematic sectional view of the telescopic cylinder 36, with the Foot piece of the boom linkage firmly connected piston rod and with the telescopic cylinder 36 connected auxiliary cylinder 41 can be seen from Fig. 15. The telescopic cylinder 36 is concentric with its center line with two Pipes 50, 51 provided, of which the tube 51, the tube 50 to form a Annulus 52 surrounds. Between the tube 51 and the cylinder jacket tube 53 of the Telescopic cylinder 36 an annular space 54 is formed, in which the piston 55 is guided is. The piston rod 35 and the piston 55 are provided with bores 56, 57, through which the annular space 54 is supplied with pressure oil for extending the piston 55. To retract the piston, the opposite side of the piston is over the Bores 58, 59 of the piston rod 35 are supplied with pressure oil. The auxiliary cylinder 41 is on the one hand through the bores 60 of the piston rod, the inner tube 50 and the Hole 61 in the bottom of the telescopic cylinder and on the other hand via the hole 62 the piston rod 65 and the annular space 52 between the tubes 50 and 51 and the bore 63 in the bottom of the telescopic cylinder 36 supplied pressure oil.

The piston rod 42 of the auxiliary cylinder 41 is also provided with bores 64 to 66, so that in the sliding bushing and thus the coupling and locking devices oil can be supplied to actuate them.

The oil supply can be provided by a microprocessor, preferably Control device take place so that the coupling of the individual shots as well as pulling and releasing the individual interlocking the shots In any case, bolts are made in the intended order.

Claims (10)

1. Crane with a telescopic jib, whose sections (5, 6), which can be telescoped out of a basic jib (4) having a jib attachment piece (3), are locked in their respective extended or retracted positions by locking pins (7, 8) and, after the locking pin connections have been released, can be extended and retracted, in each case by two strokes, by a single-stage hydraulic piston-cylinder unit (1, 2), which is fixed at one end to the jib attachment piece (3), each section (5, 6) which is to be extended or retracted being coupled once to the inner and once to the outer end region of the displaceable part of the piston-cylinder unit (1, 2), characterized in that, in the case of the piston rod (1) fixed to the jib attachment piece (3), a displaceable ring or a displaceable bush (9) with a coupling device for coupling the sections (5, 6) is guided on the cylinder (2) and can be locked both to the inner and to the outer end region of the cylinder (2).
2. Crane according to the precharacterizing clause of Patent Claim 1, characterized in that, in the case of a cylinder (2) fixed to the jib attachment piece (3), a tube which is concentric with the cylinder (2), or guides parallel to the latter, are fixed to the outer end of the piston rod (1) and enclose the cylinder (2) between them, and in that on the tube or the guides (cage) there is guided a displaceable ring or a displacement piece (23) having a coupling device, which can be coupled to the inner or the outer end regions of the tube or the guides.
3. Crane according to Claim 1 or 2, characterized in that a device is provided which guides the ring, the bush or the displacement piece with the coupling device back from the outer position to the inner position or vice versa.
4. Crane according to one of Claims 1 to 3, characterized in that the cylinder outer tube or the tube enclosing the latter or the guides (cage) are provided at their outer and inner end regions with collars (11, 12), protrusions or depressions, with which the rings, bushes or displacement pieces can be releasably locked, for example by means of claws (10), pins or bolts.
5. Crane according to one of Claims 1 to 4, characterized in that the guides are provided with coupling devices, to which the displacement piece (23) can be releasably connected by means of matching coupling devices.
6. Crane according to one of Claims 1 or 3 to 5, characterized in that hydraulic oil is supplied to the telescopic cylinder (36) through bores in the piston rod (35), and an auxiliary cylinder (41) whose piston rod (42) displaces the ring or the bush (43) is connected to the telescopic cylinder (36).
7. Crane according to Claim 6, characterized in that hydraulic oil is supplied to the auxiliary cylinder (41) via the telescopic cylinder (36).
8. Crane according to one of Claims 1 to 7, characterized in that the piston rod (42) of the auxiliary cylinder (41) is provided with a bore (64 to 66) for supplying hydraulic oil to the coupling device (43).
9. Crane according to one of Claims 1 to 8, characterized in that the coupling device is controlled in such a way that the bush carrying the latter can be displaced relative to the cylinder outer tube of the telescopic cylinder or relative to the guides which can be displaced with the piston rod only when the individual sections are locked to one another by the spring-loaded pins (7, 8; 44 to 47).
10. Crane according to one of Claims 1 to 9, characterized in that the coupling devices are locked mechanically with respect to one another such that it is ensured that the individual sections can be unlocked relative to one another only when the ring, the bush or the displacement piece is locked to the cylinder outer tube and the ring, the bush or the displacement piece on the respective end piece of the section is locked.

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