PK-8MA
 
 
 
 
 

Description

The PK-8MA heading machine is designed for driving  development workings and extraction chambers in underground potash ore mines where  cutting resistance may vary from 4.0 to 4.5 kN/cm2 and rock breaking point up to 60 MPa.
The machine breaks rock in the face,  clears  the face from the rock and loads it into mine cars.
The cutting tool of a rotary type has 2 drills (external four-beam drill with cups and internal double-beam drill with starting borers) rotating in different directions.
The machine has a mounted drill rig for drilling methane drainage boreholes.
Smooth control of the working feed provides optimal performance of the drills in faces with the different ultimate strength of rocks.
The machine has a combined system of dust suppression consisting of dust evacuation and water spray subsystems.
The heading machine has semi-automatic and manual modes of control. The control mode depends on mining, geological and technical conditions in which the heading machine is to be employed.
 
Features
  • The machine dreaks rock in the face, clear the face from the rock and loads it into mine cars
  • The cutting tool of a rotary has 2 drills (external four-beam drill with cups and internal double-beam drill with starting borers) rotating in different directions
  • The machine has a mounted drill rig for drilling methane drainage boreholes
  • Smooth control of the working advance provides optimal performance of the drill in faces with the various ultimate strength of rocks
  • The machine has a combined system of dust suppression consisting of dust evacuation and water spray subsystems
  • The heading machine has semi-automatic and manual modes of control. The control made depends on mining, geological and technical conditions in which the heading machine is to be employed
Parameters

Output, m3/min
2.24
 - while driving, m/min                                   
0.28
 - while potash extraction, t/min
4.5
Cutting profile     
arched
Roadway cross-section area, m2:
 
 - with  3.0 m tool
8.0
 - with  3.2 m tool
9.0
Travel speed, m/hour:
 
 - working speed for the 3.0 m tool (3.2 m tool)
0-15 (0-16.8)
 - maneuvering speed
0 - 200
Allowable gradient of heading, degrees               
15
Undercarriage
crawler
Conveyor                                           
belt-type
Conveyor belt speed, m/s
1.28
Angular velocity of cutting tool elements, m-1:
 
 - bridge of bit
6.97
 - internal bore
13.16
 - berm cutters
21
 - cutting-off drill bit
42.2
Value of the berm cutters vertical move relative to the crawlers supporting surface, mm
150
Pump capacity, l/min                                
260
Max. working pressure in hydraulic system, MPa       
10
Electrical equipment:
 
 - voltage, V
660
 - version
explosion proof, for mines
 - total installed capacity of electric motors, kW incl. capacity of the cutting tools drive, kW                                         
2x110
Dust suppression:
 
 - fan capacity, m3/s
1.16-2.33
 - spray system capacity, l/min
67
Overall dimensions of the heading machine in the working  position, m:
 
 - length
9.2
 - width (with 3.0 m tool)
3.0
 - width (with 3.2 m tool)
3.2
Mass, tons
59 or 60