Launch vehicle with a tilt deck for highwall mining
Embodiments of this invention relate to highwall mining, and more particularly to a launch vehicle adapted for use in highwall mining of downward angled seams of mineable material, such as coal. More specifically, the provided launch vehicle includes a substantially horizontally oriented control deck, a launch deck pivotally attached to the control deck, and a substantially horizontally oriented conveyor belt. A miner and at least one conveyor car are positioned on the launch deck while the launch deck is in a substantially horizontal orientation, then the launch deck is tilted upward relative to the conveyor belt to substantially match a planned entry dip angle of the seam to be mined. As the miner and at least one conveyor car advance into the seam, the launch deck is returned to a substantially horizontal orientation, an additional conveyor car is added to the launch deck, and the launch deck is again tilted to substantially match the entry dip angle of the seam to connect the additional conveyor car as the rearmost car in the conveyor train.
1. A launch vehicle for a highwall mining system comprising:
a substantially horizontally oriented control deck;
a launch deck, wherein the launch deck is pivotally attached to the control deck;
a conveyor belt carried on the control deck, the conveyor belt extending in substantially horizontal directions; and
a deck lift assembly configured to effect controlled lifting and lowering of the launch deck to tilt the launch deck relative to the control deck, and to return the launch deck to a substantially horizontal orientation for adding or removing a conveyor car from the launch deck;
wherein the control deck remains substantially horizontally oriented during the tilting of the launch deck by the deck lift assembly.
2. The launch vehicle of claim 1 , wherein the conveyor belt remains substantially horizontally oriented during the tilting of the launch deck by the deck lift assembly.
3. The launch vehicle of claim 1 , wherein the control deck is fixed in a substantially horizontal orientation during operation.
4. The launch vehicle of claim 1 , further comprising a conveyor car control system mounted to the launch deck and remaining in parallel relation thereto throughout all tilt angles of the launch deck.
5. The launch vehicle of claim 4 , wherein the conveyor car control system includes at least one conveyor car drive cylinder, such that actuation of the conveyor car drive cylinder causes the conveyor car to be selectively advanced into a seam or retracted therefrom.
6. The launch vehicle of claim 5 , further comprising a windlass attached to the launch deck, the windlass being configured to releasably couple to the conveyor car to prevent the conveyor car from advancing into the seam when the conveyor car drive cylinder is disengaged from the conveyor car.
7. The launch vehicle of claim 5 , further comprising at least one cable or at least one chain releasably coupled to the conveyor car, the cable or chain being configured to prevent the conveyor car from advancing into the seam when the conveyor car drive cylinder is disengaged from the conveyor car.
8. The launch vehicle of claim 7 , wherein the at least one cable or at least one chain comprises two cables or two chains, each cable or chain being attached to a respective side of the conveyor car.
9. The launch vehicle of claim 5 , wherein the conveyor car drive cylinder is configured to prevent the conveyor car from advancing into the seam when the conveyor car drive cylinder is engaged with the conveyor car.
10. The launch vehicle of claim 1 , further comprising a ramp pivotably coupled to the launch deck, the ramp being configured to support a conveyor train between the launch deck and a seam.
11. The launch vehicle of claim 1 , wherein the launch deck is tiltable at a dip angle of up to thirty degrees relative to a horizontal direction.
12. The launch vehicle of claim 11 , wherein the dip angle is at least 15 degrees.
13. The launch vehicle of claim 1 , wherein the control deck includes an electric power control cabin configured to control power to and operation of the launch vehicle.
14. The launch vehicle of claim 1 , wherein the deck lift assembly is at least one extendible hydraulic cylinder secured to the launch deck at one end of the hydraulic cylinder and secured to the control deck at an opposite end of the hydraulic cylinder.
15. A method of highwall mining a steep dip seam, comprising the steps of:
providing an elongated launch vehicle having a launch deck and a conveyor belt;
aligning the launch vehicle with a planned location of a seam to be mined;
placing a miner and at least one conveyor car on the launch deck while the launch deck is in a substantially horizontal orientation;
tilting the launch deck upward relative to the conveyor belt to match an entry angle of the seam to be mined;
using the miner to cut material from the seam being mined; and
moving the cut material to the conveyor belt by use of the conveyor car.
16. The method of claim 15 , wherein the tilting includes keeping a front end of the launch deck in a fixed location while pivoting a rear end of the launch deck upward, the pivoting being about the front end of the launch deck.
17. The method of claim 15 , comprising the further steps of:
tilting the launch deck until the launch deck returns to the substantially horizontal orientation;
placing an additional conveyor car on the launch deck while the launch deck is in the substantially horizontal orientation; and
again tilting the launch deck upward relative to the conveyor belt to match the entry angle of the seam being mined.
18. The method of claim 15 , wherein multiple conveyor cars are connected together to form a conveyor train which extends into the seam.
19. The method of claim 15 , wherein the conveyor belt is fixed in a substantially horizontal orientation.
20. The method of claim 15 , wherein aligning the launch vehicle includes positioning an end of the conveyor belt adjacent to a location where the conveyor train exits a mouth of the seam.
21. A highwall mining system particularly suitable for steep dip seams and of the type wherein multiple conveyor cars are connected together to form a conveyor train which extends into a seam being mined, comprising:
an elongated launch vehicle including:
a substantially horizontally oriented control deck including an electric power control cabin configured to control power to and operation of the highwall mining system,
a launch deck for receiving and supporting a conveyor car which is to be added to or removed from an outer end of the conveyor train when in mining operation, wherein the launch deck is pivotally attached to the control deck,
a conveyor belt supported by the control deck, the conveyor belt extending in substantially horizontal directions, and
a deck lift assembly secured to the launch deck at one end and secured to the control deck at an opposite end, the deck lift assembly configured to effect controlled lifting and lowering of the launch deck while the conveyor car is supported on the launch deck and to tilt the launch deck relative to the conveyor belt as desired to match an entry angle of the seam to be mined, and to return the launch deck to a substantially horizontal orientation for adding or removing the conveyor car from the launch deck;
a plurality of conveyor cars forming the conveyor train and adapted to convey mined material outwardly to the conveyor belt;
a miner attached to an inner end of the conveyor train for cutting material from the seam being mined and moving the material to the inner end of the conveyor train for conveyance by the conveyor train outwardly to the conveyor belt.
22. The system of claim 21 , further comprising at least one elongated hydraulic conveyor car drive cylinder mounted to the launch deck and remaining in parallel relation thereto throughout all tilt angles of the launch deck, such that actuation of the drive cylinder causes the conveyor cars to be selectively advanced into the seam or retracted therefrom.
23. The system of claim 21 , wherein the control deck and the conveyor belt remain substantially horizontally oriented during the tilting of the launch deck by the deck lift assembly.