Post by John on Aug 18, 2008 9:52:30 GMT -5
Two shaft feeders at 6.6kv feeding the main underground substation, in the north fan chamber just inbye of the workshops.
From the OCB's out to the various main subs spread around the workings.
All inbye and main road HT switchgear was Brush SF6 flameproof pressurised gas breakers. Transformers, 6.6kv/1.1kv 600KVA Brush flameproof, with SF6 breaker and SEL. (sensitive earth leakage protection, restricted neutral)
GEB's controlling conveyors were Wallacetown, (Wecol) A67 and A69 set up as master and slave on conveyors, two 120HP motor drives. Huwood TB120 conveyor drives with automatic loop take ups.
Controlled by the Huwood Mk1A flameproof control units.
The difference between the A67 and A69 were the A69 had a thruster control and contactor for the belt brakes.
Main pumps for dewatering the mine were three three throw ram pumps driven by 120 HP motors controlled by Wallacetown A67 GEB's at 1100 volts.
These pumps lifted the water from the Braithwaite tanks directly to the surface.
At the time I left, 1979, there were two main fans, 1350 HP each mounted underground in a balanced ventilation system, one on the north side of the No1 shaft and the other on the south side of the No1 shaft, both forcing air up that shaft.
When I started at Boulby in 1975, all operations were by drill, undercut, blast and muck out using Secoma single boom flameproof electric/hydraulic dill rigs, flameproof Joy undercutting machines, then mucked out with Eimco diesel LHD's. Roof bolting was with an electric/hydraulic roof bolting machine.
The LHD's loaded the rock into Stamler feeder breakers onto the belts.
Later, Jeffries Heliminers were inroduced, the 120HR models at 3.3kv controlled from Belmos KFG switchgear.
Shuttlecars were the Joy SC10's at 550 volts with Belmos control and all UK flameproof motors and wiring to NCB specs.
Later in the my stay at Boulby a road to link the main 1000 tonne ore bins was being driven west and then south called the West Links. This was driven in salt using a 120HR heliminer and two Joy SC10 shuttlecars. Roadway centering was done with flameproof lasers.
All heliminers were protected with methane monitoring equipment
type BM1, can't recall the make now!
The mine had two in seam 1000 tonne ore bins with vibrating chute at the bottom, feeding a belt up a steep drift to the shaft 200 tonne surge bin. That in turn fed the pit bottom belt to the skip weighing flasks, 20 tonnes each. The weighing equipment automatically controlled the pit bottom belt via it's scoop fluid coupling during the automatic skipping process.
All conveyors sent telemetry information back to a central control room where the mine clerk could see what was happening in the shafts and monitor the trunk conveyor system.
Communications was done via DAC mine intercom system on several channels controlled via the mine clerk in the control room, with telephone backup around the mine via an automatic exchange on the surface.
There was also an outside telephone line which could be coupled to any channel on the intercom system too.
All telephone and intercom systems were certified IS. (Intrinsically safe)
When the mine first started it was "state of the art" in both mechanical and electrical equipment available at the time.
From the OCB's out to the various main subs spread around the workings.
All inbye and main road HT switchgear was Brush SF6 flameproof pressurised gas breakers. Transformers, 6.6kv/1.1kv 600KVA Brush flameproof, with SF6 breaker and SEL. (sensitive earth leakage protection, restricted neutral)
GEB's controlling conveyors were Wallacetown, (Wecol) A67 and A69 set up as master and slave on conveyors, two 120HP motor drives. Huwood TB120 conveyor drives with automatic loop take ups.
Controlled by the Huwood Mk1A flameproof control units.
The difference between the A67 and A69 were the A69 had a thruster control and contactor for the belt brakes.
Main pumps for dewatering the mine were three three throw ram pumps driven by 120 HP motors controlled by Wallacetown A67 GEB's at 1100 volts.
These pumps lifted the water from the Braithwaite tanks directly to the surface.
At the time I left, 1979, there were two main fans, 1350 HP each mounted underground in a balanced ventilation system, one on the north side of the No1 shaft and the other on the south side of the No1 shaft, both forcing air up that shaft.
When I started at Boulby in 1975, all operations were by drill, undercut, blast and muck out using Secoma single boom flameproof electric/hydraulic dill rigs, flameproof Joy undercutting machines, then mucked out with Eimco diesel LHD's. Roof bolting was with an electric/hydraulic roof bolting machine.
The LHD's loaded the rock into Stamler feeder breakers onto the belts.
Later, Jeffries Heliminers were inroduced, the 120HR models at 3.3kv controlled from Belmos KFG switchgear.
Shuttlecars were the Joy SC10's at 550 volts with Belmos control and all UK flameproof motors and wiring to NCB specs.
Later in the my stay at Boulby a road to link the main 1000 tonne ore bins was being driven west and then south called the West Links. This was driven in salt using a 120HR heliminer and two Joy SC10 shuttlecars. Roadway centering was done with flameproof lasers.
All heliminers were protected with methane monitoring equipment
type BM1, can't recall the make now!
The mine had two in seam 1000 tonne ore bins with vibrating chute at the bottom, feeding a belt up a steep drift to the shaft 200 tonne surge bin. That in turn fed the pit bottom belt to the skip weighing flasks, 20 tonnes each. The weighing equipment automatically controlled the pit bottom belt via it's scoop fluid coupling during the automatic skipping process.
All conveyors sent telemetry information back to a central control room where the mine clerk could see what was happening in the shafts and monitor the trunk conveyor system.
Communications was done via DAC mine intercom system on several channels controlled via the mine clerk in the control room, with telephone backup around the mine via an automatic exchange on the surface.
There was also an outside telephone line which could be coupled to any channel on the intercom system too.
All telephone and intercom systems were certified IS. (Intrinsically safe)
When the mine first started it was "state of the art" in both mechanical and electrical equipment available at the time.
