LHD Load haul dump ppt

It is useful for mining engineers

1. LOAD HAUL DUMP (LHD) PRESENTED BY A GURUBRAHMAM ( Asst.Prof ) COURSE NAME:MINING MACHINERY DEPARTMENT OF MINING AMET UNIVERSITY CHENNAI.

2. INTRODUCTION 1.A load haul dump (LHD) is a specialized loading machine manufactured for the u/g mining industry. 2.LHDs are used in more than 75 percent of underground mines throughout the world and are suitable for small and large   tunnels , chambers and stopes .

3. TYPES OF LHDs LHD are available in i ) Diesel ii) Electric versions. 2. Diesel version is easily transportable from one location to another and have diesel engines as power drive of 75 to150  HP  or more.

4. SPCIFICATIONS & COMPONENTS OF LHD

5. COMPONENTS OF LHD The LHD is a machine that travels at modest speeds and consists of a internal and external components LHD INTERNAL COMPONENTS The standard for LHD is a  diesel engine  with  horse power  ranging from 78 to 145, but smaller LHDs are outfitted with  electric motors . The engine of the LHD are cooled either by water or air and located on the  chassis  along with emergency and parking  brakes , and  hydraulic  fluid resistant to fire.

6. Other internals of the LHD include a diesel exhaust treatment A ventilation system is required for the LHD to counter the excessive exhaust fumes it creates inside a confined space.

7. LHD EXTERNAL COMPONENTS The externals of the LHD include the  bucket , loading and dumping mechanisms and tires . Buckets can come in a variety of sizes, from  (0.8 to 10 m 3 ) with payloads of 1.5 to 17 tons. The tires can be treaded or smooth and may be fitted with chains.

8. SAFETY PROVISIONS Emergency and parking brakes with fire resistant hydraulic fluid is used . Head lights, audible warning signal, back up alarm and portable fire extinguisher are provided. Special cabin/canopy is also provided for safety of operator. A safety device is provided to shut off the engine if exhaust gases exceed temperature of 85 °C (or as per set value). For electric shock safety these LHD's power source(gate end box) are equipped with  earth conductivity protection  using pilot core in electric trailing cable, which isolate complete power when earth continuity is broken

9. MECHANISM OF LHD It is driven by a synchronous motor fed with power from a gate end box suitably placed with a flexible cable of about 100 metres in length . If it may also be remotely controlled . The speed of the vehicle is controlled mechanically.

10. It is driven by a synchronous motor fed with power from a gate end box suitably placed with a flexible cable of about 100 meters in length . If it may also be remotely controlled . The speed of the vehicle is controlled mechanically.

11. LOADING AND TRANSPORTATION The operate hydraulic pumps and hydraulic motors for further operation of various movement of bucket and vehicle steering.

12. Bord and pillar Method

13. Cycle time in( gdk no.9 )

14. Advantages of LHDS Availability of spares parts to reduce breakdown hours To withstand difficult conditions. For easy maintenance. Portability:Easy to move from place to place. Safety:Proper guides and covers and Electrical protective devices.

15. REFERENCEs: https://www.saimm.co.za/Journal/v104n01p001.pdf http://www.infomine.com/library/publications/docs/internationalmining/immay2010a.pdf https://www.slideshare.net/ankitnarayan008/final-49202531 https://en.wikipedia.org/wiki/LHD_(load,_haul,_dump_machine)

16. THANK YOU