Department of Mining Machinery Engineering

Facilities

Facilities and Laboratories

The Department is well equipped with following laboratories for its undergraduate, postgraduate and research activities:

1. Power Hydraulics Laboratory :


a. Computer controlled Closed Circuit and Open circuit Hydrostatic Transmission System of 15 kW capacity
It consists of open-loop and closed-loop hydraulic systems, where the load on the hydrostatic motor is controlled through pump loading.
Open circuit system consists of pressure compensated axial piston pump with raidia piston motor, whereas closed circuit system consists of swash plate controlled variable displacement pump and low speed high torque radial piston motor
In both the systems, the performance of the hydrostatic transmission systems in open and closed configurations can be tested by:
• Controlling the load on the hydrostatic motor through pump loading
• Controlling the speed of the hydrostatic motor by varying flow supplied by the main pump either by changing the swash plate angle or by varying its speed
• Controlling the speed of the motor through flow control valve
• Inertia load

b. Computer controlled Laboratory Model Hydraulic Excavator
A small in-house fabricated digger / backhoe is operated through hydraulic systems. The movement of the front attachment of the hydraulic back-hoe is accomplished through the flow supplied from proportional valves that are controlled by the in-house developed PLC.
The following experiments / studies can be performed:
• Study of the kinematics of hydraulic backhoe
• Control of the actuators of the backhoe through proportional valves that are operated through PLC
• Interfacing hydraulic system with computer through AD/DA cards.

c. controlled Proportional valve controlled hydraulic motor test set-up of 7.5 kW capacity
The system consists of two valve controlled open circuit hydrostatic drives; where either bent-axis motor or Gerotor motor can be controlled either through proportional valve or servo-proportional valve. In both cases, the load on the motor shaft is controlled through pump loading.
In both the systems, the performance of the hydrostatic drives can be evaluated in open and closed circuit conditions by:
• Controlling the load on the hydrostatic motor through pump loading
• Controlling the speed of the hydrostatic motor by varying flow through proportional valves
The system can also be used for determining the pressure-flow characteristics of the proportional and the servo-proportional valves.

d. system with Accumulator
The system consists of 7.5 kW power pack with two 10 liter and 20 litre capacities of Accumulators. It supplies hydraulic power to a bent axis hydrostatic motor which is loaded through pump loading.
The following experiments can be performed:
• Energy saving of the system using different capacities of accumulators
• Energy saving of the system at varying load
• Energy saving of the system at different pre-charge pressure of the accumulators

e. Programmable Logic Controlled Two-Motor Hydrostatic Summation Drive
It is a closed loop hydrostatic transmission system of 15 kW capacity. The system consists of a swashplate controlled variable displacement pump and two bent axis motors. Either one or two motors can be connected hydraulically with the pump in closed loop configuration through PLC. Depending on the load controlled through PLC, the closed loop system can be operated either with one or two motors The following experiments can be performed:
• Performance of the closed loop hydrostatic transmission system with single motor drive at varying load achieved through pump loading. The pump flow is varied by changing its swashplate angle through PLC.
• Performance of the closed loop hydrostatic transmission system with two motor drive at varying load achieved through pump loading. The pump flow is varied by changing its swashplate angle through PLC.
• Automatic changing from single motor to two motor drive or vice-versa with the changing of motor loading thorugh PLC

f. Hydrostatic transmission system with pump loading
This is sponsored by DST, New Delhi, under fast tract SERC project (project value: Rs. 17.4 Lakh) during the tenure 2009-2012. The setup comprises of a hydraulic power pack, a hydraulic motor with a control valve, a pump with loading circuit and a PLC (Programmable Logic Controller) operated Control Panel. The load on the system can be varied by changing set-pressure of a Pressure Relief Valve (PRV). The fluid pressures at the inlet and outlet side of the hydraulic motor and outlet side of the pump are measured by pressure transducers and data are transmitted to PC through Data Acquisition System (DAS) mounted inside the control panel for the purpose of continuous monitoring, performance analysis and online fault diagnosis.


2. Fluid Flow Machines Laboratory :


a. Reciprocating Air Compressor Experimental Set up
Title: Performance test of reciprocating air compressor
Aim: To conduct a test on reciprocating air compressor and to determine the volumetric efficiency and isothermal efficiSpecifications: Power 7.5 HP, Rpm: 800, DISPL’T: 20.5 CFM

b. Blower Testing Rig
Title: Performance test of Blower
Aim: To conduct a test on Blower to determine overall efficiency
Specifications: Motor power: 7.5 HP, Motor rpm: 2880, Diameter of impeller: 428 mm, Type of impellers: backward, forward & radial

c. Two Stage Axial Flow Fan Testing Rig
Title: Performance test of Blower
Aim: To conduct a test on Blower to determine overall efficiency
Specifications: Capacity: 180-370 m3/min, Speed: 2880 rpm, Head: 60-250 mm of W.I, Power: 15 Kw


3. CAE Laboratory :


There are thirty six numbers LAN connected terminal which are used for undergraduate students.

A. System Simulation Software – SYMBOLS Shakti Release 2.0.1 software, Academic offline mode. It was installed in 2009 in 20 standalone PC in CAE Lab. It is an object oriented hierarchical hybrid modeling, simulation and control analysis software. It allows users to create models using bond graph (BG), block-diagram and equation models. Bond graph model can be developed directly from physical understanding of system dynamics without deriving the differential equations. The equations are obtained from the bond graph model following an algorithmic and systematic approach. Large number of advanced sub-models called Capsules are available with “SYMBOLS Shakti” for different engineering and modeling domains. It automatically derives completely reduced system equations. Differential causalities and algebraic loops are solved using its powerful symbolic solution engine. Non-linearity and user code can be integrated in single editing IDE (integrated development environment). It creates high-level C language code and allows any external code embedding. The simulator module has both online and post-display facilities. Event handlers and online event notification and variation of parameters are key features of this advanced simulator. It has a well-developed control module, which automatically transforms state-space modules from BG or block diagram models and converts them to analogue or digital transfer functions. Most control charts and high-level control analysis can be performed by using this software.




4. Mining Machinery Model Laboratory :


a. An apron conveyor
b. Ground mounted friction winder
c. Views of steel wire ropes
d. Drum winder
e. Direct rope haulage
f. Mono-cable aerial ropeway
g. Belt conveyor with loop take-up system
h. Torsional rigidity test setup for steel wires ropes
i. Mine track layouts
j. Steel wire fatigue strength measuring setup


5. Material Handling Laboratory :


a. Electro-magnetic type vibratory feeder
b. Bins
c. Hopper vibratory feeder setup
d. Vibratory screen
e. Experimental setup for friction angle determination
f. Tandem gear drive arrangement of belt conveyor


6. Drilling Engineering Laboratory :


a. A jackhammer drill machine assembly with its mounting detail and screw-feed mechanism
b. Diamond drill machine
c. A wagon drill machine with its different accessories for study purpose
d. A cut-away view of a jackhammer drill machine
e. Tri-cone roller bit
f. Button bit
g. Drill mud viscosity measuring setup
h. Steel wire rope breaking strength measuring setup


Use of Laboratory Facilities:
The laboratories are primarily used for the practical classes of undergraduate & Post graduate students. Some of the experimental test set-ups are also used for research work. Some laboratory equipment are also demonstrated to the participants of short term courses.