Bearing supports, frame

Decrease shaft overhang - move bearings next to end plates. Requires major modifications to support framing or over-long shells. 

Fig. 51. Detail of the rotating autoclave (A) support frame (B) connecting bearing (C) bronze bushing (D) axle (E) positioning ring (F) oil hole (G) (five pulley...

Figure 4.20 shows typical arrangements of horizontal- and vertical-axis paddle flocculators. The axes should rotate in alternate directions along the tank, e.g. in Figure 4.20 the first and third paddles rotate clockwise, but the second rotates anticlockwise. This rolls the liquid containing the floes from paddle to paddle without excessive shear as the paddle blades pass each other. If taper flocculation is desired, each sequential axis will rotate more slowly. The choice between horizontal and vertical axes depends primarily on mechanical considerations, such as the power drive system and the maintenance of bearings and support frames. 

Two-bearing screens, ot which there are rnanv types, have the same screen boclv as the four-bearing type but without the two outer bearings and the base frame. The gyi ating motion is caused bv eccentric weights on the shaft, and the screen itself is supported bv overhead cables or springs on the floor. 

Care must be taken regarding the method of supporting ceiling panels. Large portal framed steel holdings may provide a cheap outer shell but do have a considerable amount of roof movement. Panels hung from this type of structure can be subjected to movement which cannot be tolerated in cold store construction. A tied portal, however, can be acceptable [38]. The outer shell may also be required to bear the weight of the evaporators and, in the case of stores for carcase meats, the rails and the product itself. 

Top Suspended Vertical Centrifuges A special type of top suspended centrifuge is widely used in sugar processing and is shown in Fig. 18-165. Conventionally, the drive is suspended from a horizontal bar supported at both ends from two A-frames. The drive head, which is connected to the motor or a driven pulley through a flexible coupling, carries the thrust and radial bearings that support the basket,... 

In Figure 257 two typical cantilever-shaft designs are depicted. In Figure 257(a) (K. R. Komarek, Inc., Elk Grove Village, 111., USA) the rolls (1) are positioned one above the other. In this case, feeding must be accomplished horizontally from one side. The roll shafts (2) are supported in two lower (4) and two upper bearing blocks (4a) which are clamped in between two frame plates (3) held... 

Another hinged frame (Figure 266) was developed for a small scale laboratory machine.In addition, this design features a modified support system for the rollers by coasters running on hardened rings or completely sealed bearings mounted on the rollers, which makes it very easy to mount different roll types (Figures 267 and 268). 

The example identifies a U.S. construction classification based upon NFPA 220, Types of Building Construction. The Arabic numbers following each type of construction (e.g. Type I, II, etc.) indicate fire resistance ratings for certain structural elements. The first number addresses exterior bearing walls. The second number addresses the structural frame when supporting more than one floor. The third number addresses floor construction. Other construction codes have similar and more detailed classifications. 

So far, all machines that were presented used the mill shaft design in which the roller shafts are supported on both sides by bearings that are mounted in a frame. Another, relatively new design of roller presses uses cantilevered shafts and rolls. 

Ceiling joist- One of a series of parallel framing members used to support ceiling loads and supported in turn by larger beams, girders or bearing walls. Also called roof joists. 

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