MINING AND TUNNELING MACHINERY PK_8MA 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 The plant’s design bureau is capable to work out and complete machines also with other equipment depending on customer demands