The bending speed of a universal bending machine must be adjustable for both the rapid traverse and feed motions. A load-depended flow control valve can be used for rapid traverse, after a given distance had been travelled, the bending operation must be carried out at a non-load depended and adjustable speed. The return stroke over the same distance must be controlled by the same valve. A flow control valve should be connected up in such a way that flow passes through it in the same direction during the feed and return stroke motions

Excavator loading time = 36 seconds per loading pass Truck travelling time = 351 seconds per truck Truck dumping time = 22 seconds per truck Unloaded truck Travelling back time = 181 seconds per truck Truck queuing or waiting time = 75 seconds/truck Excavator-truck spotting time = 14 seconds/truck Estimate the total number of units (trucks), if the total production of a coal mine is 4Mt per year at 91% recovery. Use the cycles per production hour from above, figure out with your reasonable detailed calculations and assumptions for all other parameters you need in your calculations including the loose and bank (prime) volume and tonnage of the coal per truck per year.

1. A 4-stroke, single-cylinder gasoline engine has 85-mm bore and 85-mm stroke. What is the piston displacement of the engine? If the engine has a 10-compression ratio, what is its clearance volume? What would be the total volume of the cylinder? 2. A four-stroke gasoline engine is running at a speed of 3,000 rpm. The piston diameter is 4 inches while the stroke is 4.5 inches. What is the speed of the piston? 3. A four-cylinder gas engine has 20-cm cylinder diameter and 40-cm stroke. The cylinders run at 150 rpm speed. The engine is a four-stroke cycle with 8 kg/cm² mean effective pressure. What is the area in cm2 and length of stroke of the engine piston in meter? Also, compute the power stroke per min per cylinder and the total power stroke of the 4 cylinders. Compute the indicated horsepower and the brake horsepower of the engine. And, what is the stroke-to-bore ratio of the engine? 4. Compute the specific fuel consumption of the 10 hp engine that drive a power tiller if it…

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Calculate the valve flow coefficient for the 5/2 double-pilot valve controlling the work cylinder. Assume acylinder stroke of 6”, an extension time of 1.0 sec, a retraction time of 0.5 secs. and ΔP=5 psi.

can you please find the solution question no:18

A hydraulic cylinder has these specs: Bore: 3.5" Stroke: 20" Rod diameter: 1.25" Pressure: 1800 PSI Flow rate at cylinder: 4 GPM a. What is the extension area of this cylinder? b. What is the retraction area of this cylinder? c. What is the extending force of the cylinder? d. What is the retraction force of the cylinder? e. What Volume of fluid is used when extending the cylinder? f. What is the speed of extension for this cylinder (in/min)?

Compute the theoretical capacity of a 8 inches diameter screw conveyor loaded at 45% of the full load. The screw shaft diameter is 2 inches with a screw pitch of 4 inches. The speed of the conveyor is 80 rpm.

Q1.Calculate the maximum force that the vertical cylinder can generate during extension and retraction based on a system pressure of 500 psi.Q2.Calculate the speed of the vertical cylinder rod during extension based upon the observed flow rate.Q3.How does the calculated speed of the vertical cylinder based upon measured flow rate compare to your measurement of extension time over the stroke length? If different, then why?

34. The speed of a hydraulic cylinder is controlled by means of a series pressure-compensated flow control valve, as shown in the given circuit. Given: Pump: V, = 25 cm'/rev n = 1000 rpm n, = 0.95 n. = 0.93 n. = 1 P,Q, Pa, Directional control valve: Q= 6x10-7 VAP Relief valve: Cracking pressure = 6 MPa P. Override pressure = 0 P=0 Hydraulic cylinder: f= 2000 Ns/m v = 0.1 m/s F= 9000 N Piston diameter = 60 mm Rod diameter = 25 mm No inner leakage Calculate: P=0 P, P, P, Pp Qu Qy Power losses in the DCV M) Power losses in the FCV Pump real flow rate