GB2034606A

GB2034606A - Apparatus for washing and then separating discrete material into finer and coarser fractions

Info

Publication number: GB2034606A
Application number: GB7937231A
Authority: GB
Original assignee: Mach & Structures Ltd
Current assignee: Mach & Structures Ltd
Priority date: 1978-10-27
Filing date: 1979-10-26
Publication date: 1980-06-11
Also published as: FR2439618A1; FR2439618B3

Abstract

An apparatus for washing and then separating discrete material, e.g. sand, gravel and stone, into finer and coarser fractions comprises a frame 10 carrying an upwardly inclined endless conveyor belt 12 for conveying material to be separated. A washing drum 14 is mounted for rotation at the upper end of the conveyor and has an open end to receive the material to be separated. A water feed device operates to direct water into the open end of the drum. A screen box 17, having a vibrating screen, is pivotally mounted to the frame under the drum 14 and a telescopic arm 18 enables the angle of inclination of the screen to be adjusted. Washed material falls from the drum 14 on to the screen box 17, where finer particles pass through the screen, and after dewatering, form a pile under the screen box. Coarser particles slide down the screen and form a separate pile on the ground. <IMAGE>

Description

SPECIFICATION Apparatus for washing and then separating discrete material into finer and coarser fractions This invention relates to an apparatus for washing and then separating discrete material, i.e. sand, gravel and stone, into finer and coarser fractions.

The apparatus is mobile and may be readily located at a desired site and also readily moved from site to site.

The present invention provides an apparatus for washing and then separating discrete material into finer and coarser fractions, said apparatus including a chassis frame which supports a washing drum rotatably mounted with respect thereto, a water supply means to feed water into the said drum and a screen box located below the drum to receive washed material discharged from the drum, whereby washed material of relatively finer and coarser fractions is adapted respectively to pass through the screen to the ground, and to be retained by the screen and then discharged from the screen to a separate area on the ground from that area on which the finer material falls.

Preferably the screen box is provided with a vibrating screen to facilitate the separation of the washed material. It is also preferable that the washing drum be provided with its own electric motor to facilitate independent operation/nonoperation of the said drum as required. The chassis frame of the apparatus is preferably provided with wheels to facilitate the movement of the apparatus on a site and from site to site.

Advantageously the screen box is pivotally mounted at one end to the frame and means are provided to adjust the angle of inclination of the screen.

The invention will be understood from the following description of an embodimentthereof given by way of example only, with reference to the accom panying drawing which illustrates in side view an apparatus according to the present invention.

Referring to the accompanying drawing the appar atus comprises a mild steel chassis frame 10 mounted on wheels 11. The chassis frame 10 supports an upwardly inclined conveyor having a driven endless conveyor belt 12 which runs on spaced roller units 12a between the outlet of a hopper 13 and a materials washing drum 14 which is rotatably mounted on a drum support structure 15 fixedly attached to the chassis frame 10. The end of the drum 14 adjacent the top of the conveyor 12 is open to receive material from the conveyor 12 into the drum 14. The drum support structure 15 also carries an electric motor 16 which is operatively connected to the washing drum 14to rotate the drum at a suitable speed i.e. 30 rpm.

Associated with the washing drum 14 is a water supply which is pumped in conventional manner to a spray nozzle located at the open end of the washing drum 14. The nozzle is positioned so as to direct the water jet upward into the drum to maximise the washing affect on the materials fed into the washing drum 14.

The chassis frame 10 supports a downwardly inclined screen box 17 with a vibrating screen, which is located directly belowthewashing drum 14 such that washed materials discharged from the washing drum 14fall into the screen box 17. The connection between the chassis frame 10 and the screen box 17 is a pivotal connection and the connection between the chassis frame 10 and the free end 17a of the screen box 17 is a telescopic joint 18 which allows the incline of the screen box 17 to be adjusted as required.

In operation, on a building site for example, the elevator is positioned where required and the discrete material - sand and gravel - to be washed and screened is fed into the hopper 13. The sand/gravel passes through the hopper outlet onto the conveyor 12 and is carried upward and fed into the rotating washing drum 14. The rotation of the drum 14 in conjunction with the water jet cleans the sand/gravel and helps feed the washed material from the drum 14 to drop into the screen box 17. The fine size gravel and sand, together with the water discharged from the drum, pass through the screen and onto a dewatering device of conventional construction. The dewatering fine size gravel and sand is discharged from the dewatering device to the ground.The gravel which is stopped by the screen is thrown clear of the screen box 17 into the direction of the incline of the screen box 17 to fall under gravity to the ground. One obtains accordingly two stockpiles of washed material on the ground, one stockpile of washed fine size gravel and sand and a second stockpile of oversized gravel, stones and other material originally contained in the discrete material fed into the hopper.

1. An apparatus for washing and then separating discrete material into finer and coarser fractions, said apparatus including a chassis frame which supports a washing drum rotatably mounted with respect thereto, a water supply means to feed water into the said drum and a screen box located below the washing drum to receive washed material discharged from the drum, whereby washing material of relatively finer and coarser fractions is adapted respectively to pass through the screen to the ground, and to be retained by the screen and then discharged from the screen to a separate area on the ground from that area on which the finer material falls.

2. An apparatus according to claim 1 wherein the screen box is provided with a vibrating screen.

3. An apparatus according to claim 1 or 2 wherein the chassis frame additionally supports a conveyor belt for feeding material to be separated to the said drum.

4. An apparatus according to claim 3 including means enabling the said drum to be operated independently from the conveyor belt.

5. An apparatus according to any of claims 1 to 4 wherein the screen box is pivotally mounted at one end to the frame, and means are provided to adjust the angle of inclination of the screen.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Apparatus for washing and then separating discrete material into finer and coarser fractions This invention relates to an apparatus for washing and then separating discrete material, i.e. sand, gravel and stone, into finer and coarser fractions. The apparatus is mobile and may be readily located at a desired site and also readily moved from site to site. The present invention provides an apparatus for washing and then separating discrete material into finer and coarser fractions, said apparatus including a chassis frame which supports a washing drum rotatably mounted with respect thereto, a water supply means to feed water into the said drum and a screen box located below the drum to receive washed material discharged from the drum, whereby washed material of relatively finer and coarser fractions is adapted respectively to pass through the screen to the ground, and to be retained by the screen and then discharged from the screen to a separate area on the ground from that area on which the finer material falls. Preferably the screen box is provided with a vibrating screen to facilitate the separation of the washed material. It is also preferable that the washing drum be provided with its own electric motor to facilitate independent operation/nonoperation of the said drum as required. The chassis frame of the apparatus is preferably provided with wheels to facilitate the movement of the apparatus on a site and from site to site. Advantageously the screen box is pivotally mounted at one end to the frame and means are provided to adjust the angle of inclination of the screen. The invention will be understood from the following description of an embodimentthereof given by way of example only, with reference to the accom panying drawing which illustrates in side view an apparatus according to the present invention. Referring to the accompanying drawing the appar atus comprises a mild steel chassis frame 10 mounted on wheels 11. The chassis frame 10 supports an upwardly inclined conveyor having a driven endless conveyor belt 12 which runs on spaced roller units 12a between the outlet of a hopper 13 and a materials washing drum 14 which is rotatably mounted on a drum support structure 15 fixedly attached to the chassis frame 10. The end of the drum 14 adjacent the top of the conveyor 12 is open to receive material from the conveyor 12 into the drum 14. The drum support structure 15 also carries an electric motor 16 which is operatively connected to the washing drum 14to rotate the drum at a suitable speed i.e. 30 rpm. Associated with the washing drum 14 is a water supply which is pumped in conventional manner to a spray nozzle located at the open end of the washing drum 14. The nozzle is positioned so as to direct the water jet upward into the drum to maximise the washing affect on the materials fed into the washing drum 14. The chassis frame 10 supports a downwardly inclined screen box 17 with a vibrating screen, which is located directly belowthewashing drum 14 such that washed materials discharged from the washing drum 14fall into the screen box 17. The connection between the chassis frame 10 and the screen box 17 is a pivotal connection and the connection between the chassis frame 10 and the free end 17a of the screen box 17 is a telescopic joint 18 which allows the incline of the screen box 17 to be adjusted as required. In operation, on a building site for example, the elevator is positioned where required and the discrete material - sand and gravel - to be washed and screened is fed into the hopper 13. The sand/gravel passes through the hopper outlet onto the conveyor 12 and is carried upward and fed into the rotating washing drum 14. The rotation of the drum 14 in conjunction with the water jet cleans the sand/gravel and helps feed the washed material from the drum 14 to drop into the screen box 17. The fine size gravel and sand, together with the water discharged from the drum, pass through the screen and onto a dewatering device of conventional construction. The dewatering fine size gravel and sand is discharged from the dewatering device to the ground.The gravel which is stopped by the screen is thrown clear of the screen box 17 into the direction of the incline of the screen box 17 to fall under gravity to the ground. One obtains accordingly two stockpiles of washed material on the ground, one stockpile of washed fine size gravel and sand and a second stockpile of oversized gravel, stones and other material originally contained in the discrete material fed into the hopper. CLAIMS

6. An apparatus according to any of the preceding claims wherein the chassis frame has wheels.

7. An apparatus for washing and then separating discrete material into finer and coarser fractions substantially as herein described with reference to the accompanying drawing.