Blade guard for mining loader buckets

Abstract

The invention relates to a guard made up of a series of teeth that are bolted to the lip of the bucket, consist of three parts made of highly durable materials, are welded together and sit on the underside, side and top of the edge of said lip. Said teeth are secured by a set of bolts, washers and nuts, so that the latter are housed in the slotted holes of the base plate to ensure that the bolts remain tight and the teeth do not fall out. The design of the teeth facilitates the entry of the bucket into the heaps of ore, reducing mechanical wear and consumption. The teeth are interchangeable, which significantly increases the durability of the assembly.

1 . A blade guard for mining loader buckets which, starting from the conventional structuring of a bucket, to the lower and leading edge of which there is attached a lip, welded thereto, there being attached thereto teeth and a lip which is equipped, in correspondence with a free and leading edge, with a plurality of through holes for the mechanical securing of the teeth by sets of bolt-washer-nut, characterised in that the lip includes, in correspondence with the lower and leading edge thereof, a common step or several independent steps the vertical wall of which defines a support and stabilisation element for the teeth, which teeth are made up of three elements, that is, a base plate with an upper middle area of the trailing edge thereof supported on the step provided on the lower face of the lip protruding from the underside and vertically with respect to same, an intermediate part supported against the outer edge of the lip and an upper part that is flush with the upper surface of the lip, which are secured to one another by welding. 
     
     
         2 . The blade guard for mining loader buckets according to  claim 1 , wherein the base plate is manufactured in wear-resistant rolled steel, including on the lower face thereof through bores ending in the lower portion in notches in the form of a slotted hole having a width in accordance with the width of the securing nuts provided for the teeth; the intermediate part is manufactured in wear-resistant rolled steel and includes channels for reinforcing the attachment between the parts by welding; the upper part is manufactured in wear-resistant rolled steel, including holes defining areas for the welding of said part to the intermediate part, as well as one or more rear extensions with holes coinciding with the through holes provided on the lip, as well as with the through bores, for stabilising the teeth with respect to the lip by bolts inserted in the upper portion together with washers and stabilised by nuts which are housed in the slotted holes of the base plate. 
     
     
         3 . The blade guard for mining loader buckets according to  claim 1 , wherein the device is complemented with pairs of corner pieces that can be coupled to one another, wherein the corner pieces are attached to the side wall of the bucket and to the lip by welding, whereas the corner pieces are welded to the upper part of each lateral tooth. 
     
     
         4 . The blade guard for mining loader buckets according to  claim 1 , wherein the lip has a rectangular main sector, which is prolonged in the front forming a triangular sector. 
     
     
         5 . The blade guard for mining loader buckets according to  claim 1 , wherein there are defined at least three types of teeth with different angles from its leading edge with respect to the angle formed in the triangular sector of the lip, that is, central teeth the leading edge of which has a more acute angle than that of the lip, intermediate teeth the leading edge of which is parallel to the leading edge of the lip, and lateral or end teeth forming a more obtuse angle with the edge of said lip, the intermediate and central teeth being interchangeable, whereas the lateral teeth can be replaced with half-used teeth, with the same structural configuration, but in which the base plate is not as thick. 
     
     
         6 . The blade guard for mining loader buckets according to  claim 1 , wherein the lip has a trapezoidal plan configuration. 
     
     
         7 . The blade guard for mining loader buckets according to  claim 1 , wherein the lip has a rectangular plan configuration. 
     
     
         8 . The blade guard for mining loader buckets according to  claim 1 , wherein the corner pieces are made up of two laminar elements of different thicknesses, in which the corner piece welded to the side wall of the bucket and to the lip is thicker than the corner piece welded to the upper part of each lateral tooth, it having been provided for the latter wherein the upper part externally and laterally fits on the corner piece to which the upper part is bolted using holes, said corner piece including a front and inner extension from which there emerges a male element that fits in a groove established on the leading edge of the corner piece. 
     
     
         9 . The blade guard for mining loader buckets according to  claim 1 , wherein the base plate has a thickness of the order of 50 mm for the teeth initially installed in the bucket, whereas in the half-used teeth has a thickness on the order of 40 mm. 
     
     
         10 . The blade guard for mining loader buckets according to  claim 1 , wherein the intermediate part has a thickness of the order of 30 mm. 
     
     
         11 . The blade guard for mining loader buckets according to  claim 1 , wherein the upper part has a thickness of the order of 20 mm. 
     
     
         12 . The blade guard for mining loader buckets according to  claim 1 , wherein the lower face of the teeth is covered with a hard metal based on hard metal carbides, applied in the form of beads, forming an array. 
     
     
         13 . The blade guard for mining loader buckets according to  claim 1 , wherein the lip includes on the lower and front face thereof a plurality of independent steps, suitable in terms of shape for receiving the respective teeth which are secured to the latter through complementary bolts, with the particularity that in the space that is defined between the independent steps, the lip incorporates claw bars welded thereto, where the corresponding claws are secured by pins.