OVERHAUL MECH. DESIGN INTRODUCTION
Submitted by-
Amrut Rajkarne
Basic Design (OVERVIIEW) : 1. Differential drive for locomotion 2. Wheels covered by conveyor belt to sustain all kinds of terrains 3. Gripping mechanism to lift victims and place joints (ROBOTIC ARM) 4. Structure of chasis for proper balancing of robot 5. Control Box
LOCOMTOTION: 1. Locomotion will be guided by a basic differential drive... 2. Now since our robot has to traverse through different types of terrains viz Rocky, pebbly , lunar etc simple wheels would get stuck up between two rocks.. So we make use of conveyor belts for ease in locomotion. By using conveyor belts locomotion will be smooth and no scope for getting stuck. 3. While using conveyor belt, the terminal two wheels are kept of bigger size while others between are kept of smaller size. This helps in smooth locomotion in case a rock comes in the path 4. Two motors would drive the robot(Each will be high toque motor). Each set of wheels on a particular side would be attached to a gear box which will be driven by a motor. In this way each motor would be attached to a gear box which finally controls the wheels.
ROBOTIC ARM : 1. The main purpose of this arm will be to lift the victims out of crevasses and place the joint at the junction of two terrains 2. Firstly this robotic arm should have as many degrees of freedom as possible. Bot to increase the degrees of freedom number of motors to be placed on the arm should be increased. This may lead to imbalance
3. Mainly our robotic arm should lift the victims from the crevasses..So a motor for up-down motion...One for gripping the victim and one motor will decide it left-right motion which will be directly attached to our chasis.
Up-down motion:
Gripping mechanism:
The gripper will use a RACK and PINION mechanism to hold the victims This will be driven by a linear actuator which will be connected to a motor
Chasis : We ll lift the victims from the crevasses and place them in a safety pit designed on the chasis only. The dimensions of that pit would be such that the victims don't topple over till our robot reaches the end point Control Box: We will have six motors(two high torque motors for differential drive + two servo motors + one small motor driving the pulley + one for the linear actuator in the gripper) in our robot. So the best possible arrangement of the switches on the control box(Considering the ease of controlling the robot) are as follows