United States Department of Agriculture
Agricultural Research Administration
Bureau of Entomology and Plant Quarantine
TUMBLING EQUIPMENT FOR RECOVERY OF INSECTICIDE RESIDUES
By C. H. Batchelder and 0. E. Berndt
Division of Cereal and Forage Insect Investigations
Tumbling equipment for removing insecticide residues from corn
plants is necessary in processing field samples for analytical determinations. Several types of tumbling equipment are in use. The machine described here has a capacity of 10 sample jars of 2 1/2 gallons each. It was assembled and used at the Toledo, Ohio, laboratory of this Bureau f 17 rolling glass jars containing sectioned corn plants and benzene. Samples of the benzene stripping fluid were then removed and shipped to chemical laboratories for residue analysis. This procedure overcame difficulties encountered previously when samples were either dried or packed green for shipment.
The machine consists of a stand on which three 80-inch rubbercovered rollers are mounted. The rollers support glass jars and turn them, as shown in figure 1. Since the jars are turned at a speed of 23 revolutions per minute, the plant material is tumbled sufficiently to expose all surfaces to moving fluid.
Parts and Their Assembly
The rectangular frame forming the top of the stand and the guard rails at each end of the frame (figs. 1, 2, and 8) were welded at the corners. All other parts were bolted together.. The legs and top frame were of 1/4- by 2- by 2-inch angle iron. Guard rails, to prevent the elass barrels from rotating clear of the rollers, were of 1/8- by 1- by 1 -inch angle iron bolted to the frame. Flat iron, 1/4 by 1 1/2 inch, was used for bracing the stand and for supporting the electric motor (figs. 3, 4, and 7).
1/ The use of horizontal rollers in the design of this machine was
sugiested by J. E. Fahey, Division of Insecticide Investigations of this Bureau.
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The three rollers were constructed similarly, each consisting of 3 1/2-inch (outside diameter) seamless, steel tubing. The tubes are supported at each end by 1-inch shafting, on which were welded 1/4- by 3-inch disks (figs. 5 and 6). Both disks have a press fit to the inside of the tube and the outside disk is welded to the end of the tube. Pillowblock bearings support the shafts (fig. 2). Each shaft extends 2 1/2 inches beyond the ends of the tubes, except at the power end of the center roller, from which it projects 3 1/2 inches to take a pulley. A 1/4- by 12- by 80-inch piece of sponge rubber was cemented to each tube, using weather-strip cement.
The electric motor rests on a plywood board supported by a 1 1/2inch, flat steel hanger (fig. 7), and a 1 1/2-inch angle iron brace that extends between the legs (fig. 2). A flexible, steel coupling connects the motor shaft with a 100:1 gear-reduction box. A 5-inch pulley on the gear box and a V-belt were used to drive a 4-inch pulley on the projecting shaft of the center roller (fig. 2). Greater or less speed of rotation may be obtained by changing the size of the pulleys. As a safety measure, a metal cover was fitted over the pulleys and bolted to the frame. Figure 9 shows dimensions of the flat piece of 16-gage sheet iron before the sides and top were bent at right angles to form the box.
The cost of all parts used in the assembly of this machine at Toledo, Ohio, in August 1949 was $103.74.
_ _ _
List of Parts
Top frame: 2- by 2- by 1/4-inch angle iron, two pieces 84 inches
long, and two pieces 28 inches long
Legs: 2- by 2- by 1/4-inch angle iron, four 30 inches long each
Braces: 1 1/2- by 1/4-inch flat iron, four 48 inches long and two 28
Guard rails: 1- by 1- by 1/8-inch angle iron, total 26 inches long Rollers:
Seamless steel tubing: Three lengths, 80 by 3 1/2 inches
Cold-rolled steel shafting: Five lengths, 7 by 1 inch, one length,
8 by 1 inch
Steel disks: Two for each shaft, 3 by 1/4 inch
Pillow-block bearings: Six to take 1-inch shafting, self-aligning, ball -bearing
Sponge rubber: Three pieces, 1/4 by 12 by 80 inches V-pulleys:
For gear-box shaft: 4-inch diameter, 1/2-inch hub
For center roller shaft: 5-inch diameter, 1-inch hub
V-belt: 12-inch center, 1/2-inch width Gear box:
Ratio 100:1 gear reduction, No. 2, horizontal, parallel compound Motor, 1/4 hp., 1,725 r.p.m.:
Motor bed: 16- by 12- by 1/2-inch plywood. Also supports the gear
Front motor-bed support: 1 1/4- by 1 14- by 1/8-inch angle iron bolted to stand legs
Rear motor-bed hanger: 1 1/2- by 1/4-inch flat iron, U-shape
Shaft coupling: Motor to gear box, 1/2 inch, flexible with nonmetallic
Cover for pulleys and belt: 10 by 18 inches, 16-gage sheet steel Bolts with nuts:
Machine: Thirty-four 3/8 by 1 inch, and six 1/4 by 1 inch
Stove: Eight 1/4 by 1 1/2 inch
UNIVERSITY OF FLORIDA
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