DD215354B5 - KNIVES AT GRAB AND SHEAR FAIRS - Google Patents

Description

For this 3 pages drawings

Characteristic of the known technical solutions

Digging vessels of excavators, in particular of bucket chain and bucket wheel excavators, consist of the vessel casing, the knife carrier, the knife and the fastening part. The knife is designed as an open rectangle or as a semicircle and butt welded to the similarly shaped knife carrier. Depending on the conditions of use, it is customary to equip the knife with additional cutting elements such as knife tips, fangs and cutting corners.

According to DD-PS 146837 and 150773, the cutting edge portions of the grave vessels are seen in the cutting direction formed so that there is a sharp-edged open rectangle or trapezium, at the corners of which advanced cutting corners are arranged.

A disadvantage of this grave vessel construction is especially on the buckets of the bucket chain excavator that is achieved by such a design and combination of Grabrabäßelemente knives, fangs or cutting edges and knife carrier no optimal grave vessel construction in terms of the required digging forces, wear resistance of the knife area, grave vessel stability and repairability.

A sharp-edged forming of the cutting line area results in that the corner line for the excavating forces in the cutting direction and the direction of Verschiebsrichtung becomes the main line of action.

The result is that the wear intensity in the region of the corner line is substantially increased and the corner blade is worn after a relatively short period of use.

Practice has shown that the advancement of the knives or cutting corners and the formation of the cutting edge areas to the tip at the intersection of the transition from the side to the face knife area only for certain Förderguteigenschaften and grave parameters of the excavator is beneficial. Another disadvantage is that the grave vessel knife consists of a one-piece sheet steel strip of the same material quality.

Object of the invention

The aim of the invention is to improve the repairability and the material economy of certain grave vessel areas and thus to increase the availability or the capacity of the excavator.

Explanation of the essence of the invention

The invention has for its object to make the knife and the knife carrier so that a fast geological conditions adaptable favorable Spangeometrie achieved and a high material utilization is achieved on the knives and the attached cutting elements.

According to the invention, the object is achieved in that a multi-part knife is attached to a uniformly to be manufactured main body of a grave vessel with high stability by a preferred in the main stress zone in grave direction knife carrier. This multi-part knife consists of the two lateral knife parts, the middle part and the two corner knife parts arranged in between.

The design of the corner knife parts and their material composition depends on the material to be conveyed.

In a conveyed material without stone deposits and thus without impact load of the tomb organ, the Eckmesserteile maximum preferred carried out and a material high wear resistance, preferably G-70 MnSiTi 7 used. The peak located in the area of the conveyor material chip center is rounded.

In intermittent loading of the tomb organ by embedded stones Eckmesserteile are not or only slightly preferred, they are reinforced in the direction of grave movement with ribs and consist of a material average wear resistance and increased toughness, preferably 40 MnCr4V or HVS 130th

embodiment

The invention will be explained below using an exemplary embodiment. In the accompanying drawings show

Fig. 1: Side view of a Baggerimers with insignificant impact load

2: front view of a bucket bucket according to FIG. 1

Fig.3: Corner knife with significant impact load

Fig.4: Corner knife with insignificant impact load.

The dredge bucket consists of the five-part knife with the two corner knives 1, the front knife 2 and the two side knives 3 and the knife carrier 4, the bucket shell 5 and the two hooks. 6

The face knife 2 and the side knife 3 of FIG. 1 and 2 are designed to be geometrically the same for all geological conditions and dredging. This also applies to the knife carrier 4, which is preferred in the transition regions from the side to the front knife in the grave direction 18. The welded joints 19 are located outside the transition region. Material moderately the knife parts are in the order Eckmesser 1, 2 front blade and side knife 3 running with decreasing wear resistance and increasing toughness, the increased wear resistance of the corner knives 1 and the face knife 2 can also be achieved by a tank of the immediate cutting edge 7. The adaptation of the entire knife to the geological conditions and the dredging method is carried out only on differently designed corner knives according to the floor category.

Grasping average digging forces on the bucket and the impact effects of stones are insignificant, the Eckmesser is made of a material maximum possible wear resistance and low or normal toughness, in the latter case by armoring the cutting edge 7 of the corner knife high wear resistance of this component is achieved , The executed with a closed cutting edge 8 Eckmesser 1 is pulled forward in the maximum Grabrichtung 9. This is a large amount of wear available. The resulting by the advancement of the corner knife tip 16 is rounded a and is located in the region of the center of gravity of the Fördergutspan cross-sectional area 11. The transition of the side to Stirnschneidenzone of the Eckmessers has the rounded portions 12.

For dredged material with stone deposits and associated significant impact effects the corner knives 1 are made of a material medium wear resistance and high toughness. The corner knife is small or not advanced 13. Welded or cast-on ribs 14,15,20 in the grave direction increase the resistance to breakouts and deformations.

Claims (3)

1. Knife on grave and Schürfgefäßen, especially grave vessels of bucket chain and bucket wheel excavators, which consist of the vessel jacket, the knife carrier, the knife and the fastening part, characterized in that the knife consists of five parts and materially the knife parts in the order Eckmesser (1), face knife (2) and side knife (3) with decreasing wear resistance and increasing toughness are performed and the welded joints (19) outside the transition region between corner knives (1) and the face knife (2) and the corner knives (1) and the Side knives (3) are located. 2. Knife on digging and Schürfgefäßen according to claim 1, characterized in that the Eckmesser (1) in conditions without or low impact load preferred (9) and the tip (16) of the Eckmessers in the center of gravity (11) of Fördergutspanes. 3. Knife on grave and Schürfgefäßen according to claim 1, characterized in that the Eckmesser (1) is preferred under conditions of use with shock ntchtoder only small {13} and the Eckmesser (1) and the front blade (2) for reinforcement with ribs ( 14,15) are provided.