WO1989012146A1

WO1989012146A1 - Wear strips

Info

Publication number: WO1989012146A1
Application number: PCT/GB1989/000541
Authority: WO
Inventors: Roger Anthony Ward
Original assignee: Milard (Hard Metals) Limited
Priority date: 1988-06-02
Filing date: 1989-05-18
Publication date: 1989-12-14
Also published as: AU3685789A; GB8813056D0; GB2219576A

Abstract

A wear strip (10) comprises an elongate body (11) of rubber of substantially rectangular cross-section, wear resistant tiles (12) bonded in recesses (13) in the rubber and extending across one face (14) of the body, which has holes (15) with metal sleeves (16) bonded therein serving as means for securing the wear strip to material handling equipment by means of fixing bolts.

Description

WEAR STRIPS

This invention relates to wear strips, more particularly for use on material handling equipment, such as chutes, plough blades and gates, where abrasion is a severe problem, such as when handling sand, clay, glass, coal, iron ore and other minerals.

It is known to provide wear strips of hard-faced mild steel, but these tend to wear away very rapidly when the hard-facing has worn away.

According to the present invention, a wear strip comprises an elongate body of rubber of substantially rectangular (or square) cross-section, wear resistant tiles bonded to the rubber and extending across one face from and along at least one edge of the rubber body, and means for securing the wear strip to material handling equipment with the aforesaid tiled face leading with respect to the direction of contact with the material being handled.

The wear resistant tiles may be formed of tungsten carbide or other "hard metal" or ceramic material having the desired wear resistance, and the term "rubber" is to be considered as embracing rubber-like materials such as appropriate formulations of polyurethane.

The tiles are preferably spaced from each other along the rubber body, so as to allow some flexing of the body to suit the curvature of say a chute or plough blade; and the tiles may extend only partially across the face of the rubber body, especially when the securing means comprises holes through the rubber body parallel to the tiles for receiving fixing bolts, which holes are preferably provided with metal sleeves bonded therein.

Alternatively, the securing means may comprise bolts with heads embedded in the rubber body, especially when the bolts extend perpendicular to the aforesaid tiled face, across which the tiles may extend fully, while again being spaced rom each other along the rubber body.

Material handling equipment may include one or more wear strips in accordance with the invention disposed along an edge thereof and/or within an area subject to wear as material is directed across it. The wear strips impede a layer of material which would cause wear, and this layer of material reduces wear by acting as a shield for the wear strips, while the resilience of the rubber body backing the tiles absorbs shock loads otherwise liable to crack or dislodge the tiles.

Two embodiments of wear strips in accordance with the invention, and one embodiment of a plough blade provided with such wear strips, will now be described, by way of example only, with reference to the accompanying drawings, in which:-

Figure 1 is a front elevation of one form of wear strip in accordance with te invention;

Figure 2 is an elevation in the direction of arrow A in Figure 1;

Figure 3 is a section on the line III-III in Figure 1;

Figure 4 is a front elevation of another form of wear strip in accordance with the invention;

Figure 5 is an elevation in the direction of arrow B in Figure 4;

Figure 6 is a section on the line VI-VI in Figure 4; and

Figure 7 is a diagrammatic perspective view of a plough blade proided with wear strips as in Figures 1 to 3 and Figures 4 to 6.

The wear strip 10 in Figures 1 to 3 consists of an elongate body 11 of rubber of rectangular cross-section, with wear resistant tiles 12 bonded in recesses 13 in the rubber so as to extend substantially across one face 14 of the rubber body, which has holes 15 with metal sleeves 16 bonded therein serving as means for securing the wear strip to equipment (such as the plough blade to be described presently with reference to Figure 7) by means of fixing bolts. The recesses 13 in which the tiles 12 are bonded space the tiles from each other along the rubber body 11, so as to allow some flexing of the body to suit the curvature of say a chute or plough blade.

The wear strip 20 in Figures 4 to 6 consists of an elongate body 21 of rubber of rectangular cross-section, with wear resistant tiles 22 bonded in recesses 23 in the rubber so as to extend across one face 24 of the rubber body, which has embedded therein the heads 25 of bolts 26 for securing the wear strip to equipment (again such as the plough blade of Figure 7), and again, the recesses 23 in which the tiles 22 are bonded space the tiles from each other along the body 21, so as to allow some flexing of the body.

In Figure 7 a plough blade 30 for use in material processing equipment has bolted to it a number of wear strips 10 in parallel spaced array perpendicular to a number of wear strips 20 in end-to-end array along the lower edge 31 of the blade, and the upright edge 32 of the blade at the leading end of the blade, with regard to the general direction X of flow of material, has two and a half wear strips 10 therealong, thus indicating that the wear strips 10 (and/or the wear strips 20) can be cut between a pair of tiles 12 (or 22) to make up any desired length.

The heavy broken line Y in Figure 7 indicates the upper limit of the normal area of maximum wear of the plough blade 30. The wear strips 10, 20 - particularly the wear strips 10 below the line Y - impede a layer of material being processed, and this layer of material itself reduces further wear by acting as a shield for the plough blade 30.

Claims

1. A wear strip comprising an elongate body of rubber of substantially rectangular cross-section, wear resistant tiles bonded to the rubber and extending across one face from and along at least one edge of the rubber body, and means for securing the wear strip to material handling equipment with the aforesaid tiled face leading with respect to the direction of contact with the material being handled.

2. A wear strip as in Claim 1, wherein the wear resistant tiles are formed of "hard metal".

3. A wear strip as in Claim 2, wherein the wear resistant tiles are formed of tungsten carbide.

4. A wear strip as in Claim 1, wherein the wear resistant tiles are formed of ceramic material.

5. A wear strip as in any one of Claims 1 to 4, wherein the "rubber" body is formed of polyurethane.

6. A wear strip as in any one of Claims 1 to 5, wherein the tiles are spaced from each other along the rubber body.

7. A wear strip as in any one of Claims 1 to 6, wherein the tiles extend only partially across the face of the rubber body.

8. A wear strip as in any one of Claims 1 to 7, wherein the securing means comprises holes through the rubber body parallel to the tiles for receiving fixing bolts

9. A wear strip as in Claim 8, wherein the holes are provided with metal sleeves bonded therein.

10. A wear strip as in any one of Claims 1 to 7, wherein the securing means comprises bolts with heads embedded in the rubber body.

11. A wear strip as in Claim 10, wherein the bolts extend perpendicular to the aforesaid tiled face.

12. A wear strip substantially as hereinbefore described with reference to Figures 1 to 3 or Figures 4 to 6 of the accompanying drawings.

13. Material handling equipment including one or more wear strips in accordance with any one of Claims 1 to 12 disposed along an edge thereof and/or within an area subject to wear as material is directed across it.

14. A plough blade provided with wear strips substantially as hereinbefore described with reference to the accompanying drawings.