초록 ▼

A device for controlling the conveyance of particulate material on a conveyor belt comprises a frame with an endless belt attached thereto. The apparatus is positioned above the conveyor belt and in frictional contact therewith whereby the motion of the conveyor results in motion of the endless belt

A device for controlling the conveyance of particulate material on a conveyor belt comprises a frame with an endless belt attached thereto. The apparatus is positioned above the conveyor belt and in frictional contact therewith whereby the motion of the conveyor results in motion of the endless belt on the apparatus. The particulate material thereby is passes between the endless belt and the conveyor belt and any bouncing movement of such material is prevented. Use of the present invention on conventional conveyor belts controls the dispersion of the particulate material carried thereon and allows for the speed of the conveyor to be increased. The present invention is suitable for use with a conveyor apparatus used with a truck and commonly known as a "stone slinger".

대표청구항 ▼

A device for controlling the conveyance of particulate material on a conveyor belt comprises a frame with an endless belt attached thereto. The apparatus is positioned above the conveyor belt and in frictional contact therewith whereby the motion of the conveyor results in motion of the endless belt

A device for controlling the conveyance of particulate material on a conveyor belt comprises a frame with an endless belt attached thereto. The apparatus is positioned above the conveyor belt and in frictional contact therewith whereby the motion of the conveyor results in motion of the endless belt on the apparatus. The particulate material thereby is passes between the endless belt and the conveyor belt and any bouncing movement of such material is prevented. Use of the present invention on conventional conveyor belts controls the dispersion of the particulate material carried thereon and allows for the speed of the conveyor to be increased. The present invention is suitable for use with a conveyor apparatus used with a truck and commonly known as a "stone slinger". the rotating shaft is driven from surface. 12. The method of claim 10, wherein the rotating shaft is driven by a downhole motor. 13. The method of claim 1, wherein the impulses are produced, at least in part, by electrical actuation. 14. The method of claim 1, wherein the expansion tool is mounted on a reelable support. 15. The method of claim 1, wherein the expansion tool is advanced through the tubing by a downhole tractor. 16. The method of claim 1, wherein a further expansion tool providing a further degree of expansion to a larger third diameter follows the expansion tool through the tubing. 17. The method of claim 16, wherein the further expansion tool utilises a different expansion mechanism. 18. The method of claim 1, wherein the impulses are applied to the expansion tool with a frequency of at least one cycle per second. 19. The method of claim 18, wherein the impulses are applied to the expansion tool with a frequency between 10 and 50 Hz. 20. The method of claim 1, further comprising applying elevated fluid pressure to the interior of the tubing in the region of the expansion tool. 21. The method of claim 20, wherein the fluid pressure is selected to produce a tubing expansion force approaching the yield strength of the tubing. 22. The method of claim 20, wherein the elevated pressure is provided at a substantially constant level. 23. The method of claim 20, wherein the elevated pressure is provided in the form of pulses, timed to coincide with the impulses to the expansion tool. 24. Tubing expansion apparatus comprising: a first expansion tool for advancement through a length of expandable tubing to expand the tubing from a smaller first diameter to a larger second diameter; and means for transmitting an impulse force to the tool. 25. The apparatus of claim 24, wherein the means for transmitting an impulse force to the tool comprises an anvil. 26. The apparatus of claim 24, wherein the expansion tool comprises an expansion member and a seal located forward of the expansion member. 27. The apparatus of claim 26, wherein the seal describes a diameter corresponding to said smaller first diameter. 28. The apparatus of claim 24, further comprising a fluid pulse generator. 29. The apparatus of claim 28, wherein the fluid pulse generator is adapted to create a fluid pulse in concert with an impulse force applied to the expansion tool. 30. The apparatus of claim 29, further comprising axially spaced seals and wherein the fluid pulse generator includes a fluid outlet located between the seals. 31. The apparatus of claim 30, wherein one seal describes a diameter corresponding to the first diameter and another seal describes a diameter corresponding to the second diameter. 32. The apparatus of claim 24, further comprising means for producing impulses. 33. The apparatus of claim 32, comprising means for producing impulses hydraulically. 34. The apparatus of claim 33, wherein said means for producing impulses hydraulically includes a variable flow restriction, such that the variation in flow through the restriction induces a variation in fluid pressure. 35. The apparatus of claim 33, wherein said means for producing impulses hydraulically comprises a hydraulic hammer. 36. The apparatus of claim 24, further comprising an expansion cone and at least one weight sub. 37. The apparatus of claim 24, further comprising a reciprocating mass, the mass being arranged to impact on the expansion tool. 38. The apparatus of claim 37, wherein the mass is spring-mounted. 39. The apparatus of claim 38, wherein the spring tends to bias the mass towards the expansion tool. 40. The apparatus of claim 37, further comprising a rotating shaft linked to the mass. 41. The apparatus of claim 40, wherein the rotating shaft is coupled to the reciprocating mass via a cam arrangement. 42. The apparatus of claim 40, wherein the mass is restrained against rotation relative to the shaft by coupling to the expansion tool. 43. The apparatus of claim 24, fu