DD215354A1 - KNIVES AT GRAB AND SHEAR FAIRS - Google Patents

Abstract

The invention relates to a knife at grave and Schuerfgefaessen of earthmoving machines, especially dredging bucket and buckets. The aim of the invention is to achieve material-economic improvements. That's why d. Task to realize a higher wear resistance of the particularly high-stress knives in the field of knife corners. The knife is made in 5 parts. Depending on the load and the conditions of use, the individual parts of the knife are made of different types of steel, and there are also differences in the design of the corner knives. The invention is particularly applicable to bucket chain and bucket wheel excavators in mining.

Description

Knife on grave and scouring vessels

The invention relates to a knife at grave and Schürfgefäßen of earthmoving machines, especially bucket buckets and buckets _e

Characteristics of the known technical solutions grave vessels of excavators, especially of bucket chain and bucket wheel excavators, consist of the vessel shell, the L: esserträger, the knife and the attachment 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 146 837 and 150 773 the cutting edge portions of the grave vessels are seen in the cutting direction formed so that a sharp-edged open rectangle or trapezium results, 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 Eckmesser- is worn after a relatively short period of use.

The practice has shown that the advancement of the knives or the cutting corners and the formation of the Schneckenckenbereiche to the top at the intersection of the transition from the side to Stirnmesserbereich only certain Förderguteigenschaft en and grave parameters of the excavator is beneficial »Another disadvantage is that daa Grave vessel knife consists of a one-piece sheet steel strip of the same material good.

Object of the invention

The aim of the invention is to the repairability and the material economy. Certain grave vessel areas too. improve and thus increase the availability and output of the excavators.

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 the grave direction knife carrier. This multi-part knife consists of the two lateral knife parts, the middle part and the two intermediate knife parts arranged between them. The design of the corner knife parts and their material composition depends on the material to be conveyed.

I ₁ a conveyed material without stone deposits and thus without impact loading of the tomb organ the Eckmesserteile maximum preferred carried out and a high material. Wear resistance, preferably G-TOMnSiTi 7 used. The tip lying in the area of the Fördergutspanschwerpunktes 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 medium 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

Fig. 2: Front view of a bucket bucket according to Fig. 1 Fig. 3j Eckmesser with significant impact load Fig. 4: Eckmesser with insignificant impact load

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

The front knife 2 and the side knife. 3 of Fig. 1 and 2 are designed geometrically the same for all geological conditions and dredging. This also applies to the knife carrier 4, which is preferred in the transitional areas from the side to the front knife in the grave direction 18. The welded joints 19 are located outside the transition area A. In terms of material, the blade parts are in the order Corner Knife .1, Face Knife 2 and Side Knife 3 .with

carried out sloping wear resistance and increasing toughness, the increased wear resistance of the corner knives 1 and the front 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 via differently shaped corner knives according to the floor category.

Engage average digging forces on the bucket and are the impact effects of stones insignificant daa Eckmesser 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 reached. The Eclonesser 1, which is designed with a closed cutting edge 8, is pulled forward to a maximum of the grating direction 9. This is a large amount of wear available. The resulting by the advancement of the corner knife tip is rounded and 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 corner knife has the rounded portions 12.

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

Claims (4)

Invention claims. 1 # Knife on grave and scouring vessels, in particular grave pots of bucket chain and bucket wheel excavators, consisting of the vessel casing, the knife carrier, the knife and the fastening device, characterized in that the knife consists of five individual 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 Eckmessern (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 grave and Schürfgefäßen according to claim 1, characterized in that the Eckmesser (1) is not or only slightly (13) preferred under conditions of use with impact load and the Eckmesser (T) and the front knife (2) for reinforcement with ribs (14; 15) are provided. For this 4 drawings