AU2010200743B2

AU2010200743B2 - Ore Screening Panel Pin System

Info

Publication number: AU2010200743B2
Application number: AU2010200743A
Authority: AU
Inventors: Mahesh Desai
Original assignee: Schenck Process Australia Pty Ltd
Current assignee: Sandvik Rock Processing Australia Pty Ltd
Priority date: 2009-03-02
Filing date: 2010-03-01
Publication date: 2014-06-05
Anticipated expiration: 2030-03-01
Also published as: AU2010200743A1

Abstract

A releasable fastening arrangement for a modular screening panel in which the periphery of the panels includes a plurality of half tubular protrusions which are 5 adapted with a corresponding tubular protrusion of an adjacent panel fit into apertures in a support frame and be secured to said frame with pins that extend into the bore formed by abutting protrusions, the improvement which includes providing the pins in two parts namely an elongated stem portion and a head portion comprising a concentric bush to fit over the end of said stem remote from 10 the portion that fits into the tubular protrusions. The two part pins can be made from a hard resilient material such as polyurethane and preferably the density of the stem portions is less than that of the liquid media used in screening which is usually water. Ll

Description

AUSTRALIA Patents Act ORIGINAL COMPLETE SPECIFICATION STANDARD PATENT Application Number: 2010200 Lodgement Date: 1 st March 2010 Nominated Patentee: Screenex Pty Ltd Invention Title: Ore Screening Panel Pin System The following statement is a full description of this invention, including the best method of performing it known to the applicant.

1 Ore Screening Panel Pin System This invention relates to fastening systems for modular panels used in vibratory screening machines of the type used in mining and quarrying. 5 Background to the invention Australian patent 482212 proposed a modular screening panel system for ore screening decks which is now widely used by the mining industry and replaced the earlier screening cloths, and large wire screening frames. The screening panels were all of the same size [eg. 300mm] and made of reinforced polyurethane. The 10 panels are adapted to be secured to an underlying support frame using dependent spigots which are a force fit into corresponding apertures in the support frame. The underlying support frame was designed specifically for the panels and itself was secured to the machine frame fitted as original equipment by the screening machine manufacturer. 15 A variety of methods have evolved for securing modular panels to the screening machines which use pin expanded spigots or edge flanges and all require complementary support frames which need to be assembled to the machine frame. Typical embodiments of these various systems are disclosed in patents 517319, 556953, 559443, 700843, 711096, 742060 and 755595. USA patent 4757664 20 discloses a pin construction which has become popular and includes a widened stem that displaces tubular protrusions to retain the panels on the support frames. Although the pin fastening system is popular it does create a problem because the pins are difficult to install and difficult to remove and pins that become loose or are lost into the screened material. 25 It is an object of this invention to improve the ease of assembly of screening decks using a pin fastening system and also make the pins easier to remove than the older style pins. Brief description of the invention. 30 To this end the present invention provides a releasable fastening arrangement for a modular screening panel in which the periphery of the panels includes a plurality of half tubular protrusions which are adapted with a corresponding tubular protrusion of an adjacent panel fit into apertures in a support frame and be secured 2 to said frame with pins that extend into the bore formed by abutting protrusions, the improvement which includes providing the pins in two parts namely an elongated stem portion and a head portion comprising a concentric bush to fit over the end of said stem remote from the portion that fits into the tubular protrusions. 5 The two part pins can be made from a hard resilient material such as polyurethane and preferably the density of the stem portions is less than that of the liquid media used in screening which is usually water. The 2 part pin makes modular panel fixing and removal easy and convenient compared with traditional one part pin. 10 The system offers: 1) Greatly reduced maintenance costs and downtime. 2) Easy installation and removal of modular panels 3) Higher personal safety compare with the current system 15 Detailed description of the invention A preferred embodiment of the invention will be described with reference to the drawings in which: Figure 1 is a side view of the pin of the two part pin of the invention; Figure 2 is a side view of the bush of the two part pin of the invention; 20 Figure 3 is an end section view of the installation of the pins into an assembled panel. The pin is made up of 2 parts- the shank 10 and bush20. The lower portion 11 of the pin shank 10 is similar to that of the pin disclosed in USA patent 4757664. The upper portion comprises a stem15 onto which a bush 25 20 is fitted. The upper part 15 shank is press fitted inside the cylindrical bore 24 of bush 20. The two components have a complementary rib and recess locking system. The lower edge 21 of bush 20 seats on the shoulder 16 of shank 10 and the internal rib 23 in the bore 24 of the bush 20 locks into the complementary recess 17 of the shank 10. 30 The 2 part pins are injection moulded with polyurethane material where the shank is made from a grade of polyurethane which can float in water or liquid screening media. These floating type pins are able to be recovered before they go into the pumps.

3 The 2 part pins may be made into different sizes to suit the from 40mm thick to 100mm thick modular screens. These pins can be used on both polyurethane and rubber modular screen panels. As shown in figure 3 the panel assembly comprises panels 30 fastened to the 5 flange 36 of frame 35. The panels incorporate edge spigots 31 with half circular recesses 32 to accommodate the pins10. To fasten the panels it is important to ensure that the rail is cleaned of all foreign material. Failure to observe this may result in a panel not seating correctly causing the rails and spigot holes to wear. Each panel to be installed is placed over the rail 10 spigot holes as shown in figure 3 . The panel is installed using a hammer, by striking the panel on the edge margin and avoiding the perforated area of panel. A light lubrication on panel spigot will help. A panel is correctly installed when the spigot "SNAPS" into the rail spigot hole. No part of panel should be higher than an adjacent panel-. When a panel is correctly 15 installed a solid tone should be heard and felt during the strike of hammer. To remove the 2 part pin for panel dismantling a round edge screwdriver and hammer are used. Holding the screwdriver firmly with the round flat edge of screwdriver pointing on top of shank in the middle of the pin the hammer is applied to the screw driver until shank gets separated from bush leaving the bush 20 inside panel. The bush is then removed from the panel hole and the hole is then cleaned up for a new pin installation. The pin stems are collected inby the filter screens in the pumping circuit of the screening machine. From the above it can be seen that this invention provides a pin fastening system 25 that reduces installation time and thus reduces machine down time. Those skilled in the art will realize that this invention has been described with reference to one particular embodiment but may be implemented with other shapes for the rail support portion of the machine frame.

Claims

1. A releasable fastening arrangement for a modular screening panel in which the periphery of the panels includes a plurality of half tubular protrusions 5 which are adapted with a corresponding tubular protrusion of an adjacent panel to fit into apertures in a support frame and be secured to said frame with pins that extend into the bore formed by abutting protrusions, the improvement which includes providing the pins in two separate parts namely an elongated stem portion and a head portion comprising a 10 concentric bush to fit over the end of said stem remote from the portion that fits into the tubular protrusions.

2. A releasable fastening arrangement as claimed in claim 1 used in association with liquid screening media, in which the stem and the bush are 15 made from a hard resilient material and the density of the stem portion is less than that of the liquid media used in screening. 20 25 30