Distinguish material handling devices, their types and purposes. Select and calculate the elements of the mechanisms for lifting, driving, rotation and elements of the load-bearing structure.

Student responsibilities:

Attendance to lectures and exercises (3 absences maximum). Semester assignment must be made and passed (condition for application and admission to oral part of the exam).

Grading and evaluation of student work over the course of instruction and at a final exam:

Project assignment, individual assignments

Upon successful completion of the course, students will be able to (learning outcomes):

1 . Identify transport devices by type of supply and area of application.

2 . Select the transport vehicle for the given operating conditions.

3 . Solve the degree of efficiency in working and braking condition for the factor pulley, steady-state resistances, gear ratio of a complex mechanism.

4 . Illustrate the default type of pulley with the kinematics of the velocities on the ropes and the corresponding gear ratio.

5 . Distinguish between ordinary and double factor pulley of the same gear ratio.

6 . Select the steel rope according to the specified operating conditions.

7 . Apply methods for calculation and dimensioning of structural elements of transport devices.

8 . Select the elements of transport devices and load-bearing structure.

9 . Develop mechanical design in the form of a project drawing of the means of transport.

Lectures

1. Introduction: General information about transport devices, capacity, volume and mass flow

2. Load handling: Drive groups, hooks, gripping mechanisms.

3. Gear ratio: general on the transfer ratio, structure and transfer ratio of the pulley.

4. Efficiency: general about efficiency in power transmission, efficiency of pulley.

5. Ropes: structure, types, calculation, and selection.

6. Ropes: structure, types, calculation, and selection.

7. Types of drive: manual drive, hydraulic drive, electric motor drive, selection of lifting motor.

8. Brakes and retainers: types of brakes, calculation of brakes on time, travel, operation and heating during braking, types of restraints.

9. Lifting mechanisms: structural design and calculation of the connection of the lifting mechanism on the load-bearing structure.

10. Motion resistances: force and mass reduction, driving resistance, acceleration resistance, wind resistance, speed selection, driving motor selection.

11. Wheels: determination of load of supports, calculation of wheels and rails.

12. Driving mechanisms: load balancing on wheels.

13. Load-bearing elements: calculation of strength and rigidity of load-bearing structure, design of winch frame, design of bridge girders, design of cantilever girders

14. Ballast and counterweight: calculation and selection of counterweight and ballast.

15. Swivel mechanisms: calculation of rotation resistance, selection of swivel bearing, design of swivel mechanism.

Exercises

1. Calculation of required flow, capacity and transfer time.

2. Determining the drive group according to the operating conditions, selecting the standard hook and dimensioning the hook assembly.

3. Calculation of the gear ratio of an arbitrary mechanism, calculation of the gear ratio for a given pulley.

4. Calculation of utility in power transmission, calculation of utility for a given pulley.

5. Determining the structure of steel ropes, calculating the load capacity, sizing the rope, calculating the breaking length of the rope.

6. Calculation and dimensioning of ropes and drums.

7. Calculation of the required power and selection of the lifting motor, selection of the lifting gear reducer.

8. Calculation of brake dimensions, determination of brake life.

9. Calculation of the force in the bolts connecting the lifting mechanism with the load-bearing structure.

10. Calculation of reduced forces and masses from the working to the drive member, calculation of driving resistance and acceleration, selection of driving motor.

11. Calculation of support loads by approximate methods, calculation of basic wheel dimensions.

12. Calculation of the main dimensions of multi-wheel supports, dimensioning of the screw connections of the driving mechanism.

13. Calculation of strength and stiffness for the main load bearing elements.

14. Determination of the required mass of counterweight and ballast.

15. Calculation of forces in rotation mechanisms, determination of rotation resistance, selection of swivel bearing.

Compulsory literature:

Recommended literature: