Question

Design a chain drive for a hammer mill to be driven by a hydraulic drive. the input speed will be 1200 rpm, and the desired output speed is 335 to 340 rpm, the hammer mill requires 75 hp. lubrication type B should be used and the center distance should not exceed 32 in.

mechanical engineering design

Answer 1

SOLUTION:

ANSWERS:

1. SPEED RATIO (i) = 3.5

2. NUMBER OF TEETH ON SMALLER SPROCKET (Z1) = 23

3.  NUMBER OF TEETH ON LARGER SPROCKET (Z1) = 81

4. DESIGN POWER [Pd] = 72.735 KW

5. POWER RATING [KW] = 36.26KW

6. SELECTION OF CHAIN = ANSI-60 TYPE (B)

7. PITCH DIAMETERS (D1) = 140 mm AND (D2) = 492 mm

8. APPROXIMATE CENTER DISTANCE (C) = 762 mm

9. NO OF LINKS (M) = 134 LINKS

10. LENGTH OF CHAIN (L) = 2552.7 mm

11. EXACT CENTER DISTANCE (C) = 760.72 mm (LESS THAN 32 INCH OR 812.8 mm )

12. PERCENT SPEED VARIATION = 0.934 %

13. TENSIONS IN CHAIN (F1) = 6384.8 N

14. FACTOR OF SAFETY = 4.9