EP3456887A1 - Excavator boom and excavator - Google Patents

Abstract

The present invention relates to a boom for an earthmoving machine, in particular an excavator, with at least two bearing plates for supporting a cylinder unit, these at least largely parallel to each other in the boom longitudinal direction, wherein the bearing plates have an end, extending outwards to the side edge of the boom curvature.

Description

The invention relates to a boom for an earthmoving machine, in particular an excavator, with at least two bearing plates for supporting a cylinder unit, these run at least largely parallel to each other in the boom longitudinal direction.

Different cantilever structures are well known in the art. Also, the formation of any bearings for the connection of linear actuators is known, which are structurally dependent formed in the form of two parallel bearing plates. Since the boom is relatively heavily stressed in the actuator connection, the bearing plates are regularly provided with additional reinforcing plates and / or created with very large plate thicknesses. This measure is expensive and leads to a disadvantageous increase in the total boom weight.

The object of the present invention is to search for possible solutions in the design of the bearings for generic boom structures.

This object is achieved by a boom according to the features of claim 1. Advantageous embodiments of the boom are the subject of the dependent claims. In the context of the invention, the term boom is used extensively. It also includes, for example, a so-called style.

According to the invention, it is proposed for the generic cantilever to carry out the bearing plate (s) with a curvature extending end-to-end to the side edge of the outer layer. The invention applies to boom versions with only one bearing plate as well as for such versions with two or more bearing plates. For the sake of simplicity, the invention and its advantageous Ausführunge is always described below with reference to a design with two bearing plates, however, the following explanations apply equally to a boom design with only one or more than two bearing plates.

In an embodiment with a plurality of bearing plates, these therefore no longer run parallel in the end section, but the distance between the bearing plates increases. The special curvature in the end region of the bearing plates, in particular in the end region of the bearing plates facing the cantilever tip, has an advantageous effect on the resulting mechanical rigidity of the cantilever, in particular in the region of the arranged bearing plates, since the force removal from the bearing point into the cantilever can be better distributed. As a result, ideally any reinforcing plates, as are customary in the prior art, can be dispensed with. In addition, the sheet thickness of the bearing plates can be reduced. In sum, the construction according to the invention allows a significant weight reduction. The lower material and time required in the production of the boom according to the invention provides a positive cost savings.

According to the invention, at least one bearing plate or both bearing plates are guided end-to-end up to the edge of the boom upper side and adjoin the formed edge of the boom surface with the side surfaces. Furthermore, it is provided here that the boom top is widened in the region of the outwardly extending bearing plates, ie the entire boom profile is wider in the area of the at least one or the adjacent bearing plates, so that the latter are extended beyond the original edge between the surface and side part and on the extended boom area, ie the lateral broadening of the boom are positioned. By this construction, the ends of the bearing plates less claimed.

According to a preferred embodiment, the or the bearing plates may be mounted vertically standing on the boom top.

The boom may be composed of a rear and front boom part cohesively to a boomerangähnlichen boom structure, but the invention is in principle applicable to any boom structure.

It is conceivable that the bearing plates extend outwards, each with an identical radius of curvature. However, it is also conceivable to provide individual bearing plates with different radii of curvature.

The proposed bearing plates or serve for the storage of a cylinder, which serves to actuate a boom mounted on the attachment and / or a boom extension. The corresponding attachment may additionally have a corresponding boom extension, with a corresponding cylinder unit then serves to actuate the boom extension.

Further, it is preferred if the curvature of the bearing or plates directly adjoins a bolt receiving the bearing plates. Corresponding bearing plates are usually formed by a bearing plate, which provides in the region of the widest point, a matching hole for receiving a bearing pin. In the direction of the boom foot, the width of the bearing plates can usually be reduced steadily. In the direction of the cantilever tip is preferably a sudden reduction of the sheet width, wherein the reduced in width bearing plate then guided outwardly with an appropriate radius of curvature to the edge of the cantilever surface.

The boom construction is composed of at least one front and at least one rear boom part. The one or more bearing plates may, for example, at least largely extend on the boom upper side of the front jib part. According to a preferred embodiment of the invention, at least one upper connecting plate can be provided in the connecting region between the jib parts, which ideally represents a part of the jib top in the connecting region of the jib parts. The connecting plate provides a suitable curvature depending on the angle of the two jib parts to each other. In the case of such a special design of the boom, it is particularly advantageous if the bearing plates extend from the boom top of the front jib part up to the upper connecting plate. The usually welded to the jib parts bearing plates then reach the end in a less stressed boom area on the connecting plate. The necessary weld seams are therefore subject to a lower stress, which has a positive effect on their fatigue resistance. An otherwise necessary aftertreatment of the welds could be omitted.

In addition to the boom according to the invention, the present invention also relates to an earthmoving machine, in particular an excavator with at least one boom according to the present invention. Accordingly, the advantages and properties of the earthmoving machine obviously correspond to the advantages and properties already discussed in connection with the excavator boom according to the invention, which is why a repetitive description is omitted here.

Figur 1:

eine perspektivische Draufsicht auf den erfindungsgemäßen Baggerausleger;

Figur 2:

eine Detailansicht der Verbindungsstelle zwischen dem vorderen und hinteren Baggerauslegerteil und

Figur 3:

eine Detailansicht des Verbindungsbereichs der Figur 2 mit geöffneter Seitenfläche des Auslegerarms.

Further advantages and features of the invention will be explained in more detail below with reference to an embodiment shown in the figures. Show it:

FIG. 1:

a top perspective view of the excavator boom according to the invention;

FIG. 2:

a detail view of the joint between the front and rear excavator boom part and

FIG. 3:

a detailed view of the connection area of FIG. 2 with open side surface of the boom.

The perspective side view of FIG. 1 This consists of a front boom part 11 and a rear boom part 12. At the front boom part connecting points 34 are provided for the movable mounting of an attachment not shown here or a boom extension. The rear boom piece 12 has corresponding bearing points 16 at the end, in order to be able to tilt it on an excavator upper or undercarriage.

Both the rear and the front boom part can be made as a monoblock. However, it is also possible, the jib parts 11, 12 composed of individual elements.

Both cantilever parts 11, 12 have a box-shaped structure, which is obtained by welding corresponding side plates. The individual side plates 11a to 11d or 12a to 12d are welded together by fillet welding.

The connection between the two jib parts 11, 12 is provided by the central connecting plate 13, wherein at least the end edges of the side plates 11a, 11b and 12a, 12b and optionally the lower sides 11d and 12d are materially connected to one another via the connecting plate 13. The connecting plate 13 has a curved shape, which also has a curved contact edge of the jib parts 11, 12 along the side plates 11a, 11b, 12a, 12b results. The connecting plate 13 is designed as a simple, thick sheet. It allows a simple connection between the boom parts 11, 12 and accordingly a simple adaptation to the desired angle, the two boom elements 11, 12 form. In addition, it is also possible to respond flexibly to the desired width of the box-shaped cantilever parts 11, 12, ie the width of the respective side surfaces 11c, 12c. The design leads to a significant reduction of the resulting manufacturing costs and the resulting total weight of the boom 10th

In the area of the boom top, the boom surfaces 11c and 12c of the boom parts 11, 12 are not directly in communication with each other. Instead, here is a plate-shaped upper connecting plate 15 is inserted or overlapping on the tops 11c, 12c mounted, and welded with two boom parts 11, 12. The plate-shaped upper connecting plate 15 is bent according to the angle that form both cantilever parts 11, 12 to each other. Optionally, the boom base could be configured with a corresponding connecting element.

In the region of the rear jib part 12 extends transversely to the boom longitudinal axis, a cylindrical tube 21 through the jib box 12, which is welded onto the central connecting plate 13. The application of the bearing tube 21 to the central connecting plate 13 at the same time ensures that the entire rigidity of the boom can be additionally increased. Via outlet openings 21a, 21b within the side elements 12a, 12b, a suitable bolt can be inserted into the cylinder tube 21. In the area of the outlet openings 21a, 21b, additional reinforcing plates 22 are additionally provided on the outside of the side plates 12a, 12b. The tube 21 forms the bearing point for connecting a luffing cylinder of the excavator according to the invention, which extends from the bearing point 21 of the rear jib part 12 to the superstructure of the excavator.

For the storage of a further hydraulic adjusting means in the form of a hydraulic cylinder is on the top of the boom 10, an additional bearing 30 is provided which allows a receptacle of a cylinder which extends from the bearing 30 to a mounted on the bearing attachment.

The bearing 30 consists of two parallel bearing plates 30a, 30b, which are perpendicular to the boom top and parallel in the boom longitudinal direction. In the region with the greatest width, in each case a bore 31 a, 31 b is provided for bolt receptacles, the bore edge being reinforced with additional metal sheets 32. The width of the bearing plates 30 a, 30 b steadily decreases in the direction of the rear jib part 12. The majority of the bearing plates including the holes 31a, 31b is arranged on the upper side 11a of the front jib part 11, however, both plates 30a, 30b extend in parallel except for the upper connecting plate 15, with which the sheet ends are welded. The extension of the bearing plates 30a, 30b up to the connecting plate 15 has the advantage that the end of the weld formed is in a less stressed region of the boom, which not only the material fatigue resistance can be increased, but also manufacturing costs can be reduced because in this If no additional treatment of the weld is necessary.

Furthermore, it can be seen that the width of the bearing plates 30a, 30b abruptly decreases after the bore 31a, 31b in the direction of the cantilever tip and then remains almost constant. This bearing plate portion 33a, 33b with reduced but almost constant width have a curvature, so that the sheet portions 33a, 33b not parallel to each other, but outwardly to the edges of the surface 11c of the front jib portion 11 protrude.

The upper plate 11a of the front jib part 11 can be widened in the region of the bearing plate sections 33a, 33b adjoining the edge, so that the plate elements 33a, 33b can protrude beyond the actual edge of the front jib part. By bending the bearing plates 30a, 30b, the overall rigidity of the bearing can be increased without, however, the strength of the bearing plates 30a, 30b need to increase. In addition, it is also not necessary to attach more reinforcing plates in the storage area. As a result, the total weight of the boom can be further reduced and further simplify its production.

Claims (12)

Boom for an earthmoving machine, in particular an excavator, with one or more bearing plates for supporting a cylinder unit,
characterized,
in that at least one bearing plate has an end-side curvature running outwards to the side edge of the cantilever, the cantilever top side is widened in the region of the outwardly extending bearing plate and the bearing plate or plates extend up to the widened cantilever top side. Boom according to claim 1, characterized in that, in the case of at least two bearing plates, these are for the most part parallel to each other in the longitudinal direction of the extension. Boom according to claim 1 or 2, characterized in that at least one bearing plate is mounted vertically upright on the boom top, wherein the boom is preferably composed of a rear and front jib member material fit to a boomerangähnlichen boom structure. Boom according to one of Ansprüchel to 3, characterized in that a plurality of bearing plates each extend with identical radius of curvature to the outside. Boom according to one of the preceding claims, characterized in that the or the bearing plates are provided for supporting a cylinder for actuating an attachment and / or a boom extension. Boom according to one of the preceding claims, characterized in that extending to the boom tip end portion of the bearing or the bearing plates has the curvature. Cantilever according to one of the preceding claims, characterized in that the sheet metal area of the bearing plate or plates adjoining directly to a pin receptacle extends outwards. Boom according to one of the preceding claims, characterized in that the or the bearing plates extend at least for the most part on the boom upper side of the front jib part. A boom according to one of the preceding claims, characterized in that the front and rear boom part are at least partially connected directly to each other and additionally a connection between the front and rear boom part is provided by means of at least one upper connecting plate, wherein the one or more bearing plates from the boom top of the extend the front boom part up to the connecting plate, ideally ends or end the bearing plates on the upper connecting plate. Boom according to claim 9, characterized in that the width of the bearing or the bearing plates is reduced by the bolt receptacle in the direction of the rear boom piece, in particular steadily decreases in this direction. Boom according to one of the preceding claims, characterized in that the width of the or the bearing plates decreases abruptly after the bolt receiving in the direction of the boom tip. Earthmoving machine, in particular excavator, with at least one boom according to one of the preceding claims.

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