EP2189413B1 - Arrangement for securing slide bearings for guiding sections on telescope cranes - Google Patents

Abstract

The mounting arrangement has multiple bore holes (5) provided in sliding elements (2) formed according to an outer contour of telescopic shots. Each bore hole ends in an opening (6) which is arranged in a perpendicular manner. A barrel bolt (1) is inserted in the opening, where a threaded hole (7) is provided perpendicularly to bolt axis. The sliding elements are made of polyamide.

Description

The invention relates to an arrangement for fastening the sliding elements for guiding the boom boxes, also called shots on telescopic cranes.

The telescopic boom is the defining feature of the telescopic mobile crane. The telescopic boom is a hydraulically telescopic steel box construction; it consists of the base box and several interlocking boom boxes, also called telescopic stages, in welded solid wall box construction.

The telescopic stages are called by the built-in telescopic system, also called locking and locking unit, successively inserted and inserted by internal single-stage hydraulic cylinder.

For large telescopic cranes, the telescopic stages are locked in a form-locking manner after extension to relieve the telescoping cylinder.

The telescopic stages, which are moved without load or under partial load, slide on extended and retracted on lubricated plastic sliding elements (sliding jaws), which are attached to the front and rear ends of the telescopic shots. They have, depending on the cross-sectional shape of the shots, usually the shape of a quarter-meter segment of 90 °. About the sliding elements, the shots are guided radially into each other and forward the forces occurring on the respective outer shots to the boom main body.

An arrangement according to the preamble of claim 1 is known from DE 298 04 237 U1 known. The attachment of the sliding elements in the interior of the shots takes place in a known manner by direct screwing with the shots.

The prior art also includes a positive connection with a mounted on the shots holding plate.

Such an attachment shows Fig. 9 , Here, the sliding jaws 2 are inserted in the shape of the sliding jaws adapted drawer-like brackets 12 which are fastened via a retaining plate 13 with a collar 14 on the end face of the telescopic section 15.

In the first-mentioned constructions it comes with direct screwing of the sliding elements that the screws loosen at the occurring during operation of the crane sliding stress of the sliding elements and ultimately tear out of the plastic, which fails the crane operation from a certain deformity, which adjusts to it leaves.

Although the use of the drawers leads to a secure and permanent attachment of the sliding jaws, but has the following disadvantages:

Drawers have a high steel sheet content, which leads to a high weight of the drawers and contradicts the efforts of crane manufacturers to weight savings in the boom area. In addition, the manufacture of the drawers is relatively complicated and therefore expensive because milled parts and welded parts are used.

The invention has for its object to provide a sliding block attachment that can be produced with little effort and ensures adaptable to the structural conditions, easy to install and permanently secure attachment.

The object is achieved according to the features of claim 1. The other claims represent expedient embodiments of the inventive solution.

According to the invention, in the according to the outer contour of the telescopic sections shaped sliding elements, which are preferably made of plastic, in particular made of polyamide, a plurality of bores introduced, each ending in a perpendicular thereto arranged by the sliding element opening. The opening in the sliding element may be a through-hole or a blind hole.

In the opening a transverse nut is used, which is provided perpendicular to the bolt axis with a threaded bore which is aligned at the corresponding engaged position of the transverse nut with the introduced in the slider bore.

In the threaded bore of the transverse nut bolts are fastening screws, which were previously inserted through holes in the telescopic section or firmly connected to this holding elements and through the holes in the slider, taking into account a maximum torque screwed so that a firm connection between the respective slide and the Telescopic shot exists.

The retaining plate may be attached to the end face of the telescopic section, so that the fastening screws are screwed in the direction of the longitudinal axis of the telescopic section in the threaded bore of the transverse nut bolt.

In the other fastening the fastening screws are screwed from the outside through holes in the telescopic section perpendicular to the longitudinal axis in the transverse nut.

The cross-section of the transverse nut can have a variety of forms, eg round, be square or elliptical. Accordingly, the opening in the sliding element is designed.

The elliptical and square cross-section have the advantage that the transverse nut is fixed in its position in the opening of the sliding element and thus the screwing in of the fastening screw is facilitated. In a round cross-section of the transverse nut bolt, the end face of the transverse nut should be designed so that a holding tool can attack. Preferably, a slot can be introduced into the end face of the transverse nut, so that the transverse nut can be brought and fixed with a screwdriver in the threaded position of the fastening screw.

Suitably, the screw used in the transverse nut is secured, for example by adhesive or paint or by metallic elements which are positively connected to the screw head.

To adapt to the structural conditions, to increase ease of mounting and repair and for better surface conditioning, it is advantageous to apply a layer of material on the underside of the sliding element. This may be a solid or better elastic plastic material, such as cold vulcanized rubber, sprayed foam or rheologically active material. Also suitable is a gel or liquid in a surrounding conformal wrapper.

With the mounting arrangement according to the invention can be compared to previously known solutions for the attachment of the sliding elements a significant weight saving of the fasteners, a cost reduction, especially with respect to the solution with drawer brackets, high creep strength of the sliding elements, variable adjustment options and improve the ease of installation and repair reach.

The invention will be explained in more detail using exemplary embodiments with reference to the figures in the drawings.

Fig. 1:

eine erfindungsgemäße Befestigungsanordnung für Gleitelemente, an einem Halteblech

Fig. 2:

einen Quermutterbolzen mit rundem Querschnitt,

Fig. 3:

die Befestigungsanordnung gemäß Fig. 1, geschnitten und vergrößert,

Fig. 4:

einen Quermutterbolzen mit elliptischem Querschnitt,

Fig. 5:

einen Quermutterbolzen mit quadratischem Querschnitt,

Fig. 6:

die Befestigung der Gleitelemente gemäß Ausführung nach Fig. 1 am Teleskopschuss,

Fig. 7:

die erfindungsgemäße Befestigungsanordnung gemäß Fig.1, bei der das Gleitelement mit einer Gummischicht unterlegt ist,

Fig. 7a:

eine Ausschnittsvergrößerung aus Fig. 7,

Fig. 8a bis 8c:

eine erfindungsgemäße Befestigungsanordnung für Gleitelemente, direkt am Teleskopschuss,

Fig. 9:

eine bekannte Schublade-Befestigung mit eingelegtem Gleitelement.

In the figures of the drawings show:

Fig. 1:

a fastening arrangement according to the invention for sliding elements, on a holding plate

Fig. 2:

a transverse nut with round cross-section,

3:

the fastening arrangement according to Fig. 1 , cut and enlarged,

4:

a transverse nut with elliptical cross-section,

Fig. 5:

a transverse nut with square cross section,

Fig. 6:

the attachment of the sliding elements according to execution Fig. 1 at the telescope shot,

Fig. 7:

the fastening arrangement according to the invention according to Fig.1 in which the sliding element is underlaid with a rubber layer,

Fig. 7a:

an excerpt from Fig. 7 .

8a to 8c:

a fastening arrangement according to the invention for sliding elements, directly on the telescopic section,

Fig. 9:

a well-known drawer attachment with inserted sliding element.

According to the illustration of the fastening arrangement according to the invention in Fig. 1 the frictional connection between the sliding member 2 and the retaining plate 3 is achieved by the fastening screws 4, which are screwed into the transverse nut bolts 1 inserted in through holes 6 of the sliding element by means of a torque wrench.

The FIGS. 2 and 3 let recognize that the inserted into the through hole 6 cross-bolt 1 centrally and transversely to its longitudinal axis bolt has a threaded hole 7, into which the fastening screw 4 is screwed, after it was passed through a hole 8 in the retaining plate 3 and the bore 5 in the sliding element 2.

The transverse nut 1 may have a circular cross-section ( Fig. 2 ), an elliptical cross section ( Fig. 4 ) or a square cross section ( Fig. 5 ) exhibit. The corresponding shape also receives the respective through-hole 6.

Fig. 6 shows an inner telescopic section 9 of a telescopic boom, which slides in an outer telescopic section 10 slides on sliding elements, which on the holding plates 3 in the in the FIGS. 1 and 3 are shown attached manner. The retaining plates 3, in turn, are fastened to the collar 11 provided on the telescopic section 10, for example by screw connection

Fig. 7 shows the fastening arrangement according to the invention according to Fig. 1 in which a rubber layer 16 is applied to the sliding element 2. This layer serves to adapt to the distance relationships between the telescopic shots to facilitate assembly in crane production and replacement of the sliding elements. Fig. 7a shows a detail Fig. 7 ,

The FIGS. 8a to 8c show the mounting arrangement for sliding elements 2, in which the fastening screws 4 are screwed from the outside through holes in a stiffening plate 17 and in the telescopic section 10 in the transverse nut 1, which are inserted into openings of the sliding elements 2.

Compilation of the reference numbers used

1

Barrel nuts

2

Slide

3

Halteblech

4

mounting screws

5

Hole in the sliding element

6

Through Hole

7

threaded hole

8th

Bore in the retaining plate

9

telescoping

10

telescoping

11

Collar on the telescopic section

12

drawer bracket

13

Halteblech

14

Collar on the telescopic section

15

telescoping

16

material layer

17

gusset

Claims (23)

1. An arrangement for securing sliding elements for guiding the boom boxes at telescopic cranes, wherein the sliding elements are matched to the outer contour of the telescopic sections sliding thereon and are attached to the ends of the telescopic sections, wherein a plurality of bores (5) are made in the sliding elements (2) formed according to the outer contour of the telescopic sections, characterised in that [these bores (5)] each end in an opening (6) arranged perpendicularly thereto through the sliding element (2), in that a transverse barrel nut (1) is inserted into the opening (6) and is provided, perpendicular to the bolt axis, with a tapped bore (7) which in the inserted state of the transverse barrel nut (1) is in alignment with the bore (5) made in the sliding element (2), in that fastening screws (4) are placed through bores (8) in the telescopic section or in holding elements securely connected thereto as well as through the bores (5) in the sliding element (2) and with regard to a maximum torque are screwed into the tapped bores (7) of the transverse barrel nuts (1) in such a manner that there is a secure connection between the respective sliding element (2) and the telescopic section.
2. An arrangement according to claim 1, characterised in that the fastening screws (4) are screwed, in the direction of the longitudinal axis of the telescopic section (10), into the transverse barrel nuts (1) through bores in a holding sheet (3) secured to the end face of the telescopic section (10).
3. An arrangement according to claim 1, characterised in that the fastening screws (4) are screwed into the transverse barrel nuts (1) from the exterior through bores in the telescopic section (10), in a manner perpendicular to the longitudinal axis of the latter.
4. An arrangement according to claim 1, characterised in that the sliding elements (2) are composed of a slidable material.
5. An arrangement according to claim 4, characterised in that the sliding elements (2) are composed of a plastics material.
6. An arrangement according to claim 5, characterised in that the sliding elements (2) are composed of polyamide.
7. An arrangement according to claim 1, characterised in that the transverse barrel nut (1) has a round cross-section.
8. An arrangement according to claim 1, characterised in that the transverse barrel nut (1) has a square cross-section.
9. An arrangement according to claim 1, characterised in that the transverse barrel nut (1) has an elliptical cross-section.
10. An arrangement according to claim 7, characterised in that the end face of the transverse barrel nut (1) is fashioned in such a manner that it can be engaged by a tool.
11. An arrangement according to claim 10, characterised in that a slot is made in the end face of the transverse barrel nut (1).
12. An arrangement according to any one of the preceding claims, characterised in that the screw (4) inserted into the transverse barrel nut (1) is secured.
13. An arrangement according to claim 12, characterised in that the screw is secured by adhesive or paint.
14. An arrangement according to claim 12, characterised in that the screw is secured by metallic or plastics elements which are connected to the screw head in a positive-locking manner.
15. An arrangement according to claim 2, characterised in that the holding sheet (3) is screwed to an end collar (11) of the telescopic section (9, 10).
16. An arrangement according to any one of the preceding claims, characterised in that the opening (6) in the sliding element (2) is a through bore.
17. An arrangement according to any one of the preceding claims, characterised in that the opening (6) in the sliding element (2) is a blind bore.
18. An arrangement according to any one of the preceding claims, characterised in that a material (16) is applied as a layer to the underside of the sliding elements for adaptation to the actual structural conditions between the telescopic sections.
19. An arrangement according to claim 18, characterised in that the material (16) is cold-cured rubber.
20. An arrangement according to claim 18, characterised in that the material (16) is sprayed-on expanded plastic.
21. An arrangement according to claim 18, characterised in that the material (16) is a rheologically active material.
22. An arrangement according to claim 18, characterised in that the material (16) is a sheathed gel.
23. An arrangement according to claim 18, characterised in that the material (16) is a sheathed fluid.

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