Portable trommel

Abstract

A portable trommel has a chassis, including support wheels at one end thereof for movement of the trommel. A trommel is rotatably mounted on the chassis and has an input and an output end. A hopper and an input conveyor, for supplying material to be screened to the input end of the trommel, are mounted on the chassis adjacent the input end of the trommel. An output or fines conveyor, for collecting material passing through the trommel screen, is mounted on the chassis, below the trommel. A stockpiling conveyor is mounted on the chassis and has a lower end adapted to receive screened material from the fines conveyor and an upper end for discharging screened material to form a stockpile. The stockpiling conveyor can be in two parts, which can be folded into a retracted position for storage and transportation, and further can be mounted for rotation about a vertical axis to enable an arcuate storage pile to be formed.

1. A portable trommel comprising:
 a chassis, including support wheels at one end thereof for the movement of the portable trommel; 
 a trommel rotatably mounted on the chassis and having an input end, an output end, and a trommel screen; 
 input means for supplying material to be screened to the input end of the trommel, the input means being mounted on the chassis adjacent the input end of the trommel; 
 output means for collecting material passing through the trommel screen, the output means being mounted on the chassis, below the trommel; and 
 a stockpiling conveyor mounted on the chassis and having a lower end for receiving screened material from the output means and having an upper end for discharging screened material to form a stockpile, wherein the stockpiling conveyor comprises a first lower part, pivotally attached to the chassis and a first upper part, which is pivotally attached to the first lower part, the first lower and the fist first upper parts being movable between an extended, operational position, in which the stockpiling conveyor extends upwardly and outwardly from the chassis and a retracted position for transportation, in which the first lower part is at an angle to the first upper part and the first upper part extends over the chassis, and further wherein the first lower part of the stockpiling conveyor has a lower end mounted to the chassis for rotation about a vertical axis, to enable the stockpiling conveyor to form an arc-shaped stockpile; 
 wherein the lower end of the first lower part is pivotally mounted to the chassis for motion about a horizontal axis, and wherein the portable trommel includes a body extending upwardly from the chassis and including an upper support bracket providing a support point, with the vertical axis of rotation of the stockpiling conveyor extending through the support point, and wherein a support extends between the support point and the stockpiling conveyor for support thereof. 
 
     
     
       2. A portable trommel as claimed in  claim 1 , wherein the first lower part of the stockpiling conveyor has a lower end mounted to the chassis for rotation about a vertical axis, to enable the stockpiling conveyor to form an arc-shaped stockpile. 
     
     
       3. A portable trommel as claimed in claim  2  1, wherein in the input means comprises an input hopper and an input conveyor at the bottom of the input hopper which , wherein the input conveyor discharges into the input end of the trommel, and wherein the output means comprises a fines conveyor extending along the portable trommel from beneath the trommel to the stockpiling conveyor. 
     
     
       4. A portable trommel as claimed in  claim 3 , wherein the lower end of the stockpiling conveyor includes a collection chute at a lower end thereof for collecting and directing material onto the stockpiling conveyor thereof, and wherein the fines conveyor includes a discharge chute at the an output end thereof, which directs material downwardly onto the stockpiling conveyor. 
     
     
       5. A stockpiling conveyor as claimed in  claim 2 , wherein the lower end of the first lower part is pivotally mounted to the chassis for motion about a horizontal axis, and wherein the portable trommel includes a body extending upwardly from the chassis and including an upper support bracket providing a support point, with the vertical axis of rotation of the stockpiling conveyor extending through the support point, and wherein a support extends between the support point and the stockpiling conveyor for support thereof. 
     
     
       6. A portable trommel as claimed in claim  5  1, wherein the support comprises an elongate flexible element attached to the first upper part of the stockpiling conveyor. 
     
     
       7. A portable trommel as claimed in claim  2  1, wherein a turntable is mounted on the chassis, for rotation about a the vertical axis, and wherein the first lower part of the stockpiling conveyor is mounted to the turntable. 
     
     
       8. A portable trommel as claimed in  claim 7 , which includes drive means for the turntable, for rotation of the stockpiling conveyor. 
     
     
       9. A portable trommel as claimed in  claim 8 , wherein the drive means comprises a pair of hydraulic piston and cylinder assemblies, pivotally connected between the chassis and the turntable. 
     
     
       10. A portable trommel as claimed in claim  8  1, wherein first which includes an actuation means for displacing the first lower and first upper parts between the extended and the retracted positions. 
     
     
       11. A portable trammel as claimed in  claim 10 , wherein the actuation means comprises a pair of hydraulic pistons piston and cylinders cylinder assemblies and a corresponding pair of mechanical linkages on either side of the stockpiling conveyor, with each hydraulic piston and cylinder assembly and one mechanical linkage providing a connection between the first lower and first upper parts of the stockpiling conveyor. 
     
     
       12. A portable trommel as claimed in  claim 11 , wherein each mechanical linkage comprises a first extension member pivotally connected to the first lower part of the stockpiling conveyor, a second extension member secured to the first upper part of the stockpiling conveyor, and a connection member pivotally connected to the first and second extension members, with the respective hydraulic piston and cylinder assembly pivotally connected between the first lower extension member and the first lower part of the stockpiling conveyor. 
     
     
       13. A portable trommel as claimed in claim  12  1, which includes a support for the first lower part of the stockpiling conveyor, for support thereof in the retracted position. 
     
     
       14. A portable trommel as claimed in claim  7  1, wherein the input means comprises an input hopper and an input conveyor at the bottom of  below the input hopper which, wherein the input conveyor discharges into the input end of the trommel, wherein the output means comprises a fines conveyor extending along the portable trommel from beneath the trommel to the stockpiling conveyor, and wherein the fines conveyor is inclined at an angle and has a lower end located beneath the trommel and an upper end located above the lower end of the stockpiling conveyor. 
     
     
       15. A portable trommel as claimed in  claim 14 , which includes: a power source; a hydraulic pump connected to and run by the power source; a control unit for controlling the power source and hydraulic pump; a first hydraulic motor connected to and run by the hydraulic pump and mounted for driving the trommel; a plurality of hydraulic conveyor drive motors mounted for driving the input conveyor, the fines conveyor and the stockpiling conveyor, and each being connected to the hydraulic pump,; a drive means for rotation of the stockpiling conveyor about the vertical axis, wherein the drive means comprises a hydraulic piston and cylinder assembly; an actuation means for displacing the first lower and first upper parts of the stockpiling conveyor between the extended and the retracted positions, wherein the actuation means comprises a hydraulic piston and cylinder assembly; and a plurality of connections between the hydraulic pump and the hydraulic piston and cylinder assemblies of the drive means and the actuation means. 
     
     
       16. A portable trommel as claimed in claim  14  1, which includes a rejected material conveyor, attached to the chassis and extending from the output end of the trommel, for removal of coarse material that has travelled through the trommel. 
     
     
       17. A portable trommel as claimed in  claim 16 , wherein a lower end of the rejected material conveyor is pivotally attached at a lower end there of to the chassis, and wherein an a hydraulic actuator is provided for displacing the rejected material conveyor between an extended, working position, and a retracted position. 
     
     
       18. A portable trommel as claimed in  claim 17 , wherein the rejected material conveyor comprises a second lower part and a second upper part which are pivotally connected together, and which includes a further wherein the hydraulic actuator is connected between the second lower and second upper parts for displacing the second lower and second upper parts rejected material conveyor between an the extended, working position, and a the retracted position, the rejected material conveyor in a retracted position having the second lower part thereof extending generally upwardly against the output end of the trommel and the second upper part thereof extending generally horizontally across the top of the trommel. 
     
     
       19. A portable trommel as claimed in  claim 7 , wherein the first lower part of the stockpiling conveyor is pivotally mounted to the turntable for rotation about a the horizontal axis. 
     
     
       20. A portable trammel as claimed in  claim 16 , wherein the rejected material conveyor comprises a second lower part pivotally attached to the chassis for movement about a second horizontal axis, and a second upper part pivotally connected to the second lower part for movement about a third horizontal axis, whereby the rejected material conveyor can be moved between an extended, working position, in which the rejected material conveyor extends outwardly and upwardly form the chassis, and a retracted position, in which the second lower part extends generally upwardly adjacent the output end of the trommel, and the second upper part extends over the chassis. 
     
     
       21. A portable trommel as claimed in  claim 20 , which includes a body, wherein the input hopper and input conveyor are mounted on the body, wherein the first upper part of the stockpiling conveyor, in the retracted position thereof, extends above and is supported by the body, and wherein the second upper part of the rejected material conveyor, in the retracted position thereof, extends above the trommel and is supported on by the body. 
     
     
       22. A portable trommel as claimed in claim  21  1, wherein the input hopper and the input conveyor are provided means is between the trommel and the stockpiling conveyor. 
     
     
       23. A portable trommel comprising:
 a chassis, including support wheels at one end thereof for movement of the trommel;   a trommel rotatably mounted on the chassis and having an input end and an output end and having a trommel screen;   input means for supplying material to be screened to the input end of the trommel, the input means being mounted on the chassis adjacent the input end of the trommel;   output means for collecting material passing through the trommel screen, the output means being mounted on the chassis below the trommel;   a rejected material conveyor, attached to the chassis and extending from the output end of the trommel, for removal of coarse material that has travelled through the trommel; and   a stockpiling conveyor mounted on the chassis and having a lower end for receiving screened material from the output means and having an upper end for discharging screened material to form a stockpile;   wherein each of the rejected material conveyor and the stockpiling conveyor is movable between an extended, operational position extending upwardly and outwardly from the chassis, and a retracted position for transportation, the rejected material conveyor and the stockpiling conveyor not extending substantially beyond the chassis in their retracted positions.   
     
     
       24. A portable trommel as claimed in  claim 23 , wherein the input means comprises an input hopper and an input conveyor at the bottom of the input hopper, which input conveyor discharges into the input end of the trommel, and wherein the trommel is mounted with the output end thereof adjacent one end of the chassis, the rejected material conveyor is mounted extending from said one end of the chassis, the input means is mounted on the chassis between the trommel and the other end of the chassis and the stockpiling conveyor is mounted at the other end of the chassis. 
     
     
       25. A portable trommel as claimed in  claim 24 , wherein the stockpiling conveyor comprises a first lower part pivotally attached to the other end of the chassis and a first upper part pivotally attached to the first lower part, which first lower and upper parts are moveable between the extended, operational position, and the retracted position for transportation, and
 wherein the rejected material conveyor comprises a second lower part pivotally attached to the one end of the chassis and a second, upper part pivotally connected to the second lower part, which second lower and upper parts are movable between the extended, operational position and the retracted position for transportation.