EP3519344B1 - Telescoping jib comprising a rod guying system for a mobile crane and guying method therefor - Google Patents

Description

The invention relates to a telescopic boom of a mobile crane with a plurality of telescopic sections telescopic from a jib basic box from a transport position into an operating position and with a guy system for bracing the telescopic boom, which comprises a plurality of tie rods connected to one another in succession, starting from the jib basic box via at least one guy support to at least one of the extended telescopic boom run.

The invention also relates to a method for bracing a telescopic boom of a mobile crane, in which a plurality of clamping rods connected in succession are braced between a basic boom of a telescopic boom and at least one adjacent telescopic section of the telescopic boom.

document EP 1 213 254 A1 discloses the features of the preamble of claim 1. From the German patent application DE 10 2015 009 156 A1 a telescopic crane boom is known. The crane boom consists of a base section and one or more telescopic sections. In order to increase the load capacity of the crane boom, a single pair of guy supports and traction devices are used. The pair of guy supports are arranged in a V-shape at a head end of a first telescopic section and extend at right angles to the crane boom. The traction means are attached to winches on the one hand at a foot end of the basic shot and on the other hand to a head end of a second telescopic shot. The two traction means also extend along the crane boom and are each guided over one of the two guy supports in the area of their free ends. For this purpose, deflection rollers are arranged on the guy supports, which are wrapped around at least once by the respective rope. Each pulley can be fixed using a holding function. The traction devices are wound up or unwound via the cable winches when the crane boom is extended and retracted and tensioned after the extension has been completed. After tensioning, the deflection rollers are also fixed. The tension of the traction means relieves the load on the crane boom and reduces or prevents bending of the crane boom.

The German patent also discloses DE 34 47 095 C2 another telescopic boom on a superstructure of a crane. The telescopic boom is braced by an arrangement of tension cables and deflection pulleys. The tensioning cables are attached to each foot end of the respective telescopic sections, are deflected at each head end of the respective adjacent and outer telescopic sections via one of the deflection rollers and converge on a tensioning cylinder attached to the superstructure.

Furthermore, from the European patent EP 2 504 267 B1 a mobile crane with a telescopic boom with three telescopic boom parts known. The partial booms run parallel and at a distance from each other. The spacing takes place via triangular connecting plates, in the corners of which the partial brackets each run. The connecting plates are each arranged in the area of the head ends of the partial boom and at a foot end of the basic partial boom.

Also from the other European patent EP 1 354 842 B1 a mobile crane with a telescopic boom is known in which ropes and rods are used as anchoring means.

The German patent DE 100 62 517 C2 relates to a guy system for a telescopic boom of a mobile crane. The telescopic boom has in the usual way a basic box on which a guy stand is arranged at right angles. A rear guying leads from a free end of the guy stand to the foot area of the basic box. A front guying is connected to the free end of the guy stand and to the head piece or to a collar of one of the inner boxes of the telescopic boom. In order to dispense with cable winches, the front guying is formed over its length by a number of interconnectable tension elements, each with a fixed length, in order to set the desired tensile force. The fixed lengths of the tension elements are dimensioned such that a certain number of tension elements corresponds to a predetermined discrete extension length of the telescopic boom.

The patent US 4,982,853 discloses a guy system for a multi-stage Telescopic boom, wherein a guy support is attached to the base of the base box and further guy supports are each attached to the collar of the base box or to the collar of an inner box. There are tension cables between the guy supports, the tension cable being attached to the tension support and to the head of the telescopic boom.

Also the Chinese utility model CN 202 558 505 U describes a guy system for a telescopic boom, where three guy ropes are guided from a head of the telescopic boom via a front guy support and a rear guy support with a rope deflection roller to a foot of the basic box.

The invention has for its object to provide a telescopic boom for a mobile crane with a rod guy system and a guy method for this, which are characterized by a lighter design and improved handling in road operation and an increase in load capacity with unchanged telescopic boom dimensions.

This object is achieved by a telescopic boom with the features of claim 1 and a method with the features of claim 12. Advantageous refinements of the invention are specified in subclaims 2 to 11.

According to the invention, in the case of a telescopic boom of a mobile crane with a plurality of telescopic sections telescopic from a jib basic box from a transport position into an operating position and with a guy system for guying the telescopic boom, which comprises a plurality of clamping rods connected to one another in succession, starting from the jib main box via at least one guy support to at least one of the extend telescopic boom, an increase in the load and a lighter design achieved that a guide holder for the sliding tension rods is arranged on the boom base box, which receives the sliding tension rods in the transport position of the telescopic boom and in the operating position at least one of the sliding tension rods on one the guy supports are articulated at the outer end of the telescopic head and at the opposite end to an adjacent one Guy support one adjacent telescopic shot head can be fixed to a holding mechanism. This also reduces set-up times between road and crane operations. The entire guy system is carried on the mobile crane, especially on the jib base box. In this case, the displaceable tension rods can advantageously be extended from the assigned guide holder or retracted into the latter.

A space-saving implementation of the guy system is achieved in that each guy support is arranged at the outer end of a boom head box head or a telescopic shot head.

In a further embodiment of the invention it is provided that a guy support is arranged on the boom base box and on each telescopic section. The telescopic boom can therefore be braced at several points, which in turn increases the stability of the bracing and improves the load capacity of the telescopic boom. This also allows a lighter and smaller design to be implemented with the same load.
The guying system is simplified in terms of design in that each guying support has an opening for the displaceable tensioning rods to be carried out and the holding mechanism for the respective displaceable tensioning rod is arranged in the region of the opening.

For a particularly simple implementation of the guy system, it is provided that the holding mechanism comprises a movable locking element with which the respective tension rod can be fixed in the opening in the operating position by engaging in a recess in the respective tension rod.

A further improvement in the stability and the load capacity of the telescopic boom is given in that each guy support comprises two legs, which are arranged on the right and left of the telescopic boom as seen in the longitudinal direction of the telescopic boom and an angle of 45 ° to 135 °, more preferably, is preferred Include 90 ° way.

In a further embodiment of the invention it is provided that at least one tension rod is articulated and / or firmly attached to each leg of each guy support can be fixed on the holding mechanism.

In a conventional manner, it is provided that the successive telescopic sections and the boom base box can be locked together.

In addition, the overall height of the mobile crane for road operation is maintained by the fact that a guide mechanism, which connects the guiding brackets of the guy system to the jib base box via a guy support, allows the guiding brackets to be set up from a transport position to an operating position and the guiding brackets and those resting on them in the operating position slidable tie rods run parallel to a longitudinal direction and above the telescopic boom.

In order to achieve a space-saving pivotability of the guide holders and displaceable tension rods, it is provided that the guide holders can be pivoted from the transport position into the operating position via articulation points, the pivot points are arranged in the course of the guide holders and adjacent to the guy support, the displaceable tension rods in the transport position have the guide brackets aligned with the articulation points of the guide brackets.

With regard to the first guy support on the head of the boom base box, a guy is provided on the left and right stationary tension rods on the boom base box in the region of its foot.

A simplified and space-saving method for bracing a telescopic boom, in which a plurality of clamping rods connected in succession are braced between a boom base box of a telescopic boom and at least one adjacent telescopic section of the telescopic boom, is achieved in that, together with a successive extension of the individual telescopic sections from the boom basic box, one each the tension rods are extended from a guide holder from a transport position into an operating position and each tension rod is fixed in the operating position on a guy support of the adjacent telescopic section by means of a holding mechanism.

• Figur 1 eine perspektivische Ansicht eines Mobilkrans mit einem Teleskopausleger,
• Figur 2 eine perspektivische Teilansicht eines Mobilkrans gemäß Figur 1 mit teilweise ausgefahrenem Teleskopausleger,
• Figur 3 eine perspektivische Draufsicht auf einen komplett ausgefahrenen Teleskopausleger,
• Figur 4 eine Detailansicht einer Abspannstütze an einem Auslegergrundkasten des Teleskopauslegers und
• Figur 5 eine Detailansicht der Abspannstützen am Teleskopauslegers in der Stellung gemäß Figur 2 mit offenen Riegelelementen.

An embodiment of the invention is explained in more detail below. Show it:

• Figure 1 a perspective view of a mobile crane with a telescopic boom,
• Figure 2 a partial perspective view of a mobile crane according to Figure 1 with partially extended telescopic boom,
• Figure 3 a top perspective view of a fully extended telescopic boom,
• Figure 4 a detailed view of a guy support on a boom base box of the telescopic boom and
• Figure 5 a detailed view of the guy supports on the telescopic boom in the position according Figure 2 with open latch elements.

In Figure 1 a perspective view of a mobile crane designated by 1 is shown. The mobile crane 1 essentially comprises an undercarriage 2 and an uppercarriage 3. The undercarriage 2 carries counterweights 4 and has four vehicle axles 5, each with two wheels 6 suitable for road use. The undercarriage 2 can of course also be equipped with more or less than four vehicle axles 5. Furthermore, the undercarriage 2 carries the superstructure 3, which can be pivoted about an essentially vertically oriented axis of rotation D with respect to the undercarriage 2. The superstructure 3 and the undercarriage 2 can of course also be rigidly mounted on one another. A combined driving and crane cabin 7 is arranged on the superstructure 3 and can be pivoted about a vertical axis K from the front - as seen in the forward direction F of the mobile crane 1 - to the rear and vice versa. The combined driving and crane cabin 7 is thus in the driving position behind the superstructure 3 and in the crane operating position on the side next to the superstructure 3. In addition, a luffing telescopic boom 8 is mounted on the superstructure, which is fully retracted for driving on the road and counter to the forward direction F of the Mobile crane 1 is placed on the undercarriage 2 at a shallow angle starting from a horizontal downward so that guy supports 15 arranged on the telescopic boom 8 and projecting upward do not increase the overall height when the mobile crane 1 is traveling. It is of course also possible to design the driving and crane cab 7 separately from one another.

The telescopic boom 8 consists in the usual manner of a boom base box 9 and a plurality of extendable and retractable telescopic sections 10a-h and has a guy system 11 in order to achieve an increase in the load with the telescope boom 8 otherwise unchanged. With this guy system telescopic boom 8 with smaller diameters or cross sections can be realized while maintaining the load. The guy system 11 essentially consists of a large number of tension rods 16, 16 ', 16a-16h, 16a'-16h', of which the displaceable tension rods 16a-h, 16a'-h 'parallel to and with the telescopic sections 10a-10h. and extendable. In the Figure 1 the tension rods 16a-16h, 16a'-16h 'are fully retracted for road travel and rest above the boom base box 9 in left and right guide brackets 13a, 13b. For driving on the road, the left and right guide brackets 13a, 13b together with the tension rods 16a-16h, 16a'-16h 'are also pivoted into a rest position in order not to increase the overall height of the mobile crane 1.

The boom basic box 9 is connected in the usual manner at its foot to the superstructure 3 via a horizontal luffing axis W and via a luffing cylinder 12 (see Figure 2 ) can be swung up and down. In a conventional manner, the boom base box 9 takes in the telescopic sections 10a-h, which are arranged one inside the other and can be extended and retracted. In each extended state, the telescopic sections 10a-h are connected to one another via bolts, not shown. The foot of the respective inner and thus smaller telescopic section 10a-h is bolted to the next outer and larger telescopic section 10a-h or the boom basic box 9 via a suitable bolting position hole. In the Figure 2 Thus, for example, the base of the telescopic section 10h is connected to the head 10 of the telescopic section 10g via the bolts (not shown).

In Figure 2 4 is a partial perspective view of the mobile crane 1 according to FIG Figure 1 shown with partially extended telescopic boom 8. The innermost and therefore uppermost telescopic section 10h is extended, the remaining telescopic sections 10a-g are still retracted. The superstructure 3 is for the crane operation from the position for road travel (see here Figure 1 ) pivoted through 180 °, so that the telescopic boom 8 points in the forward direction F and there is space for the arrangement of counterweights 4 on the rear of the superstructure 3. The driving and Crane cabin 7 has now been moved to the side of the superstructure 3 for crane operation.

It is also from the Figure 2 it can be seen that, seen in the longitudinal direction L of the telescopic boom 8, a lifting mechanism 14 with a cable drum for lifting and lowering the crane loads is arranged on the boom basic box 9. The cable drum of the lifting mechanism 14 points upwards and its rolling axis is arranged at right angles to the longitudinal direction L of the telescopic boom 8 (see also Figure 3 ). A lifting cable 18 is wound up and unwound from the lifting mechanism 14 and runs from the lifting mechanism 14 along and above the telescopic boom 8 to the end of the last telescopic section 10h. At the end of the last telescopic shot 10h there is a deflection roller 19 and a guide roller 31 (see Figure 3 ), over which the hoisting rope 18 is guided.

In addition to the large number of tie rods 16, 16 ', 16a-16h, 16a'-16h', the guy system 11 essentially comprises V- and fork-shaped guy supports 15, each of which is seen at the outer end of a head 9a of the boom base box 9, as seen in the longitudinal direction L of the telescopic boom 8 or a head 10 of each telescopic section 10a-h are arranged. Each V- and fork-shaped guy support 15 comprises a left leg 15a and a right leg 15a '. Each of the left and right legs 15, 15a 'consists of a lower part 15b, 15b' and an upper part 15c, 15c '. The two lower parts 15b, 15b ', when the telescopic boom 8 is horizontally oriented, connect each other on the outside and above in the area of corners of the telescopic sections 10a-h, which are essentially square in cross section, or of the basic boom box 9, which is essentially square in cross section, and extend obliquely below approximately an angle of 45 ° upwards and outwards. At the upper free ends of the lower parts 15b, 15b ', the upper parts 15c, 15c' adjoin one another at an angle of approximately 45 ° so that they extend vertically upwards.

The telescopic boom 8 is braced by means of the fixed jib base frame tie rods 16, 16 'on the jib base frame 9 and the displaceable tie rods 16a-h, 16a'-h each in connection with the guy supports 15. The left and right stationary tie rods 16, 16' run in a transport position at a flat angle to the longitudinal direction L of the telescopic boom 8 and are each fixed at one end to the associated guy support 15 in the transition region between its lower and upper legs 15b, 15b ', 15c, 15c' and connected to the other end in the lateral region of the foot of the boom base box 9. The clamping forces acting on the first guy support 15 of the basic boom box 9 are thus introduced into the basic boom box 9 via the fixed clamping rods 16, 16. The displaceable tension rods 16a-h, 16a'-h 'are placed on the left and right guide holders 13a, 13b in the retracted state. Each of these guide holders 13a, 13b is designed as an upwardly open, flat U-shaped profile with U-shaped guide tracks for each of the displaceable tension rods 16a-h, 16a'-h 'and serves as a magazine for the displaceable tension rods 16a-h, 16a' -h 'when the telescopic boom 8 is retracted. The guide holders 13a, 13b are each pivoted at the head about an articulation point H, H' with a horizontal axis at the upper end of the legs 15a, 15a 'of the guy support 15 at the head of the boom base box 9a. On the opposite foot, the guide brackets 13a, 13b are mounted with a set-up mechanism 30 at the foot of the boom base box 9. Before the telescopic boom 8 is luffed up and extended, the guide holders 13a, 13b with the displaceable tension rods 16a-h, 16a'-h 'are pivoted up from their transport position into an operating position by means of the toggle-type setting mechanism 30 via an auxiliary cylinder. In this operating position, the displaceable tension rods 16a-h, 16a'-h 'and the guide holders 13a, 13b run parallel and above the telescopic boom 8.

In order to enable the above-described movement of the guide holders 13a, 13b from the transport position into the operating position and also to obtain the advantage of the reduced overall height in the transport position, not only the guide holders 13a, 13b but also the displaceable tension rods 16a-h, 16a ' -h 'be articulated with articulation points H, H'. Each of the displaceable tension rods 16a-h, 16a'-h 'is thus formed at least in two parts with an articulation point H, H'. These hinge points H, H 'of all displaceable tension rods 16a-h, 16a'-h' and also the guide holder 13a, 13b lie in the transport position of the guide holder 13a, 13b and the telescopic boom 8 on a common, imaginary, horizontal axis. With respect to an extended pair of the first or uppermost displaceable tension rods 16h, 16h 'is from the Figure 2nd It can be seen that the displaceable tension rods 16h, 16h 'have an articulation point H, H' in the vicinity of the uppermost guy support 15. The distance of the articulation point H, H 'to the fixed connection of the displaceable tension rods 16h, 16h' to the uppermost guy support 15 corresponds to the distance of the top guy support 15 to the articulation point H, H 'of the guide brackets 13a, 13b in the transport position of the telescopic boom 8. Corresponding pivot points H, H 'and associated distances can also be found in all other displaceable tension rods 16h, 16h', although these are not shown in the drawing.

The displaceable tension rods 16a-h, 16a'-h, which are connected to each other via the guy supports 15 in the extended state of the telescopic cylinder 8, thus form a rope-like, flexible construction, similar to a link chain, via the multiplicity of articulation points H, H '.

In Figure 3 a perspective top view is shown diagonally from above of a fully extended telescopic boom 8. The guy supports 15 are arranged on each telescopic shot head 10 and on the boom basic box head 9a and are thus spaced apart from one another. The legs 15a and 15a 'of the guy support 15 are arranged on the right and left of the telescopic boom 8. The opposite upper parts 15c, 15c 'of the guy supports 15 are at a distance b from one another. With regard to the displaceable tension rods 16h, 16h ', the associated articulation points H, H "are shown in the vicinity of the uppermost guy support 15. Each of the displaceable tension rods 16a-h, 16a'-h' is thus formed in two parts.

Furthermore, from the Figure 3 it can be seen that the lower parts 15b, 15b 'have a first length l and the upper parts 15c, 15c' have a second length l '. Since the displaceable tension rods 16a-h, 16a'-h 'are arranged in the operating position essentially in alignment with one another along the telescopic boom 8, the first and second lengths l, l' are to be adapted accordingly, since the diameter of the telescopic sections 10 ah is based on this Remove boom base box 9 and thus this is compensated for by an associated increase in lengths l, l '.

Figure 4 shows a detailed view of a guy support 15 on a boom base box 9 of the telescopic boom 8. Since none in the present case displaceable tension rods 16a-h, 16a'-h 'are stored in the guide holder 13a, 13b, all telescopic sections 10a-10h are at least partially extended. It can also be seen that an opening angle α of the two legs 15a and 15a 'is approximately 45 ° to 135 °, preferably 90 °. Here, the two legs 15a, 15a 'lie in a common, imaginary plane which is oriented at right angles to a longitudinal direction L of the telescopic boom 8. The lower parts 15b, 15b 'of the two legs 15a, 15a' themselves have an elongated triangle-like shape with the respectively adjoining vertical upper part 15c, 15c ', one base side of the triangle resting on the telescopic section 10a-h or on the boom base box 9 .

In the upper parts 15c, 15c 'of the legs 15a, 15a', an actuatable holding mechanism 17 is arranged in each case for fixing the displaceable tension rods 16a-h, 16a'-h '. As already described above, the displaceable tension rods 16a-h, 16a'-h 'are each fixedly arranged on the associated upper part 15c, 15c' of a guy support 15. An articulation point H, H 'enables pivoting of the displaceable tension rods 16a-h, 16a'-h' inserted in the guide holders 13a, 13b into the transport position. At the opposite end, the displaceable tension rods 16a-h, 16a'-h 'are fixed via the respective holding mechanism 17 at the upper ends of the upper parts 15c, 15c' of the legs 15a, 15a '. Each of the holding mechanisms 17 essentially consists of a left or right locking element 24a, 24b, which engages with a left or right recess 23a-c, 23a'-c 'in the displaceable tensioning rods 16a-h, 16a', which is designed to complement this in a form-fitting manner. -h 'can be brought (see also Figures 3 and 5 ). For each displaceable tension rod 16a-h, 16a'-h ', three recesses 23a-c, 23a'-c' are arranged in the longitudinal direction at a distance and in succession: a first recess 23a, 23a 'at the beginning of the displaceable tension rods 16a-h , 16a'-h 'for fixing in the retracted state of the respective telescopic section 10a-h, a second recess 23b, 23b' in the middle of the displaceable tension rods 16a-h, 16a'-h 'for fixing in the case of a respective half-extended telescopic section 10a-h and a third recess 23c, 23c 'at the end of the displaceable tension rods 16a-h, 16a'-h' for fixing to a respective fully extended telescopic section 10a-h.

Is also from the Figure 4 evident (see also Figure 5 ) that each slidable tension rod 16a-h, 16a'-h 'on the guy supports 15 in and next to the upper leg 15c, 15c' left and right castors 27a-g, 27a'-g 'are arranged to extend and Support the retracting movement of the respective displaceable tension rod 16a-h, 16a'-h 'on each guy support 15.

The Figure 5 shows a detailed view of seven of the eight guy supports 15 when the telescopic sections 10a-g are retracted. In this predominantly retracted state of the telescopic boom 8, the displaceable tension rods 16a-g, 16a'-g 'are also retracted and are received by the guide holder 13a, 13b. When the telescopic boom 8 is extended, the displaceable tensioning rods 16a-h, 16a'-h 'run on rollers 27a-g, 27a'-g' which are arranged in and next to the upper legs 15c, 15c 'of the legs 15a, 15a' . Here, the upper part 15c, 15c 'of the legs 15a, 15a' is each provided with an opening 32a-g, 32a'-g 'in which the displaceable tensioning rods 16a-h, 16a'-h' during their inward and outward movement be performed. These openings 32a-g, 32a'-g 'are delimited at the bottom by the rollers 27a-g, 27a'-g' and at the top by the locking elements 24a, 24b. A lateral boundary is provided by walls of the upper parts 15c, 15c '.

Is also in the Figure 5 the function of the holding mechanism 17 for fixing the displaceable tension rods 16a-h, 16a'-h 'in the opening 32a-g, 32a'-g' to the desired extension length is shown. In the preferred embodiment, the respective locking element 24a, 24b can be moved in a sliding direction s 'and thus in the longitudinal direction of the respective upper part 15c, 15c' from a lower locking position into an upper unlocking position. In the locking position, the locking element 24a, 24b engages with the respective recess 23a, 23a 'of the respective displaceable tension rod 16a-h, 16a'-h'. In the unlocked position, the locking element 24a, 24b is shifted upwards in the sliding direction s 'so that the locking element 24a, 24b has moved out of the respective recess 23a, 23a' and thus moves above the respective displaceable tensioning rod 16a-h, 16a'- h 'is located. In addition, the locking elements 24a, 24b are each prestressed in the locking position via an upper spring element 28a ', which acts downwards in the sliding direction s', so that a drive is required for moving in the unlocking position.

This drive for moving the locking elements 24a, 24b is designed as follows. Each of the locking elements 24a, 24b is laterally connected to a left or right upper sliding element 25a ', 25b', which extends downward to the beginning of the upper part 15c, 15c '. There it rests on left and right wedge pieces 22a, 22b, which each serve as a sliding link for movement of the upper sliding elements 25a ', 25b' in the sliding direction s' and mechanical force deflection. The left and right wedge pieces 22a, 22b are attached to upper ends of the right and left lower slide members 25a, 25b, respectively. These sliding elements 25a, 25b have a sliding roller 26a, 26b at the lower end, are displaceable in the longitudinal direction of the lower parts 15b, 15b 'in a sliding direction s and end at the lower end of the lower parts 15b, 15b' and are thus the surface of the respective one Telescopic shot 10a-h facing. Like the upper sliding elements 25a ', 25b', the lower sliding elements 25a, 25b are each prestressed in the direction of the lower end of the lower parts 15b, 15b via a lower spring element 28a, 28b and thus in the locking position of the locking elements 24a, 24b. In order to be able to move the respective lower sliding element 25a, 25b upwards in the sliding direction s and thus to move the locking elements 24a, 24b from the locking position into the unlocking position, a drive with left and right sliding cylinders 29a, 29b is provided. At each free end of a piston rod of the sliding cylinder 29a, 29b there is a sliding wedge 21a, 21b (see also here Figure 4 ) attached, on which a ramp-like lower end is provided. The sliding wedges 21a, 21b are displaced below the left and right sliding rollers 26a, 26b by extending the sliding cylinders 29a, 29b in order to raise the lower sliding element 25a, 25b, on which the sliding rollers 26a, 26b act, in the sliding direction S. The sliding cylinders 29a, 29b are arranged on the right and left in the area of the upper corners of the boom base box 9 and can be moved in and out in a sliding direction S.

Since at the time of actuation of the respective locking elements 24a, 24b from the locking position into the unlocking position, the respective guy supports 15 still adjoin the head 9a of the boom base box 9, all locking elements 24a, 24b can be moved in succession from the same sliding cylinders 29a, 29b via the sliding wedges 21a , 21b are operated.

The following is based on the Figures 1 to 5 the function of the guy system 11 explained. In a first step, the innermost telescopic section 10h of the telescopic boom 8 is extended together with its guy support 15. Since the displaceable tensioning rods 16h, 16h 'in the rod fixed points 20h, 20h' of the legs 15a and 15a 'of the guy support 15 are fastened to the guy support 15, they are simultaneously taken along in the longitudinal direction L of the telescopic boom 8 and thus pulled out of the guide holders 13a and 13b . Here, the displaceable tensioning rods 16h, 16h 'are guided through the openings 32g, 32g' and on the rollers 27a, 27a 'of the guy supports 15 of the telescope section 10g which is not yet extended in the longitudinal direction L. When a desired bolting position of the innermost telescopic section 10h is reached, the displaceable tension rods 16h, 16h 'are fixed on the legs 15a and 15a' by the two holding mechanisms 17 of the adjacent telescopic section 10g in the usual manner at half and full extension length. In principle, different bolting positions can be provided for each telescopic section 10a-h, which then define a telescopic section 10a-h in a full or half or otherwise pre-selected extension path of the telescopic section 10a-h. In parallel with the extension and bolting of the further telescopic sections 10a-f, the displaceable tension rods 16a-g, 16a-g 'are then successively and sectionally clamped between the respective guy supports 15 of the telescopic sections 10a-f and the boom base box 9 in the same way.

Reference list

1

Mobile crane

2nd

Undercarriage

3rd

Superstructure

4th

Counterweights

5

Vehicle axle

6

bikes

7

Driving and crane cabin

8th

Telescopic boom

9

Boom basic box

9a

Head of the boom base box

10th

Head of a telescopic shot

10a-h

Telescopic shots

11

Guy system

12th

Rocker cylinder

13a

left guide bracket

13b

right guide bracket

14

Hoist

15

Guy support

15a

left thigh

15a '

right leg

15b

lower part of the left thigh

15b '

lower part of the right leg

15c

upper part of the left thigh

15c '

upper part of the right leg

16

left stationary tension rod

16 '

right fixed tension rod

16a-h

left sliding tension rods

16a'-h '

right sliding tension rods

17th

Holding mechanism

18th

Hoist rope

19th

Pulley

20a-h

left pole fixed points

20a'-h '

right pole fixed points

21a

left sliding wedge

21b

right sliding wedge

22a

left wedge piece

22b

right wedge

23a-c

left recesses

23a'-c '

right cutouts

24a

left locking element

24b

right locking element

25a

lower left sliding element

25b

lower right sliding element

25a '

upper left sliding element

25b '

right upper sliding element

26a

left sliding roller

26b

right sliding roller

27a-g

left casters

27a'-g '

right casters

28a

lower left spring element

28a '

top left spring element

28b

right lower spring element

28b '

right upper spring element

29a

left sliding cylinder

29b

right sliding cylinder

30th

Opening mechanism

31

Leadership role

32a-g

left openings

32a'-g '

right openings

a

Opening angle

b

width

D

Axis of rotation

F

Forward direction

H

left hinge points

H'

right hinge points

K

vertical axis

l

first length

l '

second length

L

Longitudinal direction

s

Sliding direction

s'

Sliding direction

S

Sliding direction

W

Seesaw axis

Claims (12)

1. Telescoping jib (8) of a mobile crane (1) comprising a plurality of telescoping sections (10a-h) which can be telescoped out of a jib basic box (9) from a transport position to an operating position, and comprising a guying system (11) for guying the telescoping jib (8), which comprises a plurality of successively mutually connected tension rods (16a-h, 16a'-h') which extend from the jib basic box (9) via at least one guying support (15) to at least one of the extended telescoping jibs (8),
   characterised in that
   a guide holder (13a, 13b) for the tension rods (16a-h, 16a'-h') is arranged on the jib basic box (9) and receives the tension rods (16a-h, 16a'-h') in the transport position of the telescoping jib (8) and, in the operating position, in each case at least one of the displaceable tension rods (16a-h, 16a'-h') on one of the guying supports (15) is fixedly articulated in each case to the outer end of the telescoping section head (10) and can be fixed to a holding mechanism (17) on the opposite end on an adjacent guying support (15) of an adjacent telescoping section head (10).
2. Telescoping jib (8) as claimed in claim 1, characterised in that each guying support (15) is arranged in each case at the outer end of a jib basic box head (9a) or of a telescoping section head (10).
3. Telescoping jib (8) as claimed in claim 1 or 2, characterised in that a guying support (15) is arranged on the jib basic box (9) and each telescoping section (10a-h) respectively.
4. Telescoping jib (8) as claimed in any one of claims 1 to 3, characterised in that each guying support (15) has an opening (32a-g, 32a'-g') for the displaceable tension rods (16a-h, 16a'-h') to be guided therethrough and the holding mechanism (17) for the respective displaceable tension rod (16a-h, 16a'-h') is arranged in the region of the opening (32a-g, 32a'-g').
5. Telescoping jib (8) as claimed in claim 4, characterised in that the holding mechanism (17) comprises a movable locking bar element (24a, 24b), by means of which the respective displaceable tension rod (16a-h, 16a'-h') in the opening (32a-g, 32a'-g') can be fixed in the operating position by engagement into a recess (23a-c, 23a'-c') in the respective displaceable tension rod (16a-h, 16a'-h').
6. Telescoping jib (8) as claimed in any one of claims 1 to 5, characterised in that each guying support (15) comprises two limbs (15a, 15a') which are arranged on the telescoping jib (8) to the right and left of a centre of the telescoping jib (8), as seen in the longitudinal direction (L) of the telescoping jib (8), and form an angle (a) of 45° to 135°, preferably 90°.
7. Telescoping jib (8) as claimed in claim 6, characterised in that at least one displaceable tension rod (16a-h, 16a'-h') is fixedly articulated to each limb (15a, 15a') of each guying support (15) and/or can be fixed to the holding mechanism (17).
8. Telescoping jib (8) as claimed in claims 1 to 7, characterised in that the successive telescoping sections (10a-h) and the jib basic box (9) can be secured to one another.
9. Telescoping jib (8) as claimed in any one of claims 1 to 8, characterised in that by means of an erecting mechanism (30) which connects the guide holders (13a, 13b) of the guying system (11) to the jib basic box (9) via a guying support (15), the guide holders (13a, 13b) can be erected from a transport position to an operating position and, in the operating position, the guide holders (13a, 13b) and the displaceable tension rods (16a-h, 16a'-h') resting thereon extend in parallel with a longitudinal direction (L) and above the telescoping jib (8).
10. Telescoping jib (8) as claimed in claim 9, characterised in that the guide holders (13a, 13b) can be pivoted from the transport position to the operating position via articulation points (H, H'), the articulation points (H, H') are arranged over the course of the guide holders (13a, 13b) and adjoining the guying support, the displaceable tension rods (16a-h, 16a'-h') in the transport position on the guide holders (13a, 13b) have articulation points (H, H') which are aligned with the articulation points (H, H') of the guide holders (13a, 13b).
11. Telescoping jib (8) as claimed in any one of claims 1 to 10, characterised in that the guying support (15) on the head (9a) of the jib basic box (9) is guyed to the jib basic box (9) in the region of its foot via left and right, positionally fixed tension rods (16, 16').
12. Method for guying a telescoping jib (8) of a mobile crane (1), in particular as claimed in any one of claims 1 to 11, in which a plurality of successively mutually connected, displaceable tension rods (16a-h, 16a'-h') are guyed between a jib basic box (9) of a telescoping jib (8) and at least one adjoining telescoping section (10a-h) of the telescoping jib (8), characterised in that, together with successively extending the individual telescoping sections (10a-h) from the jib basic box (9) in each case one of the displaceable tension rods (16a-h, 16a'-h') is extended from a guide holder (13a, 13b) from a transport position to an operating position and each displaceable tension rod (16a-h, 16a'-h') in the operating position is fixed to a guying support (15) of the adjacent telescoping section (10a-h) via a holding mechanism (17).

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