Gear reducer

Eig. 1. Parts of an extmder A, screw B, barrel C, heater D, thermocouple E, feed throat E, hopper G, thmst bearing H, gear reducer 1, motor , deep channel feed section K, tapered channel transition section and L, shallow channel metering section (15). 

Access door in cylinder directly opposite motor for gear reducer removal... 

For instance, power can be transmitted from one machine to the other through shafts, flexible couplings, and gear reducers (mechanical equipment). Power can be transmitted through a torque converter (hydraulic equipment) or by a combination of mechanical and hydraulic equipment. 

Using Turbines mth Reduction Gears. When gear reducers are connected to steam turbines, the steam rates must be increased ... 

In the 1980s in the United States an effort was initiated to develop a downhole turbine motor that was activated by compressed air. This motor was provided with a gear reducer transmission. This downhole pneumatic turbine has been successfully field tested [82]. 

Because of their proximity to the wall, anchor agitators are more effective in maintaining heat transfer coefficients to higher viscosities. Relatively high torques and larger gear reducers are required, however. Studies by Uhl and Voznick ( ) correlated the heat transfer coefficient in a manner similar to that used with turbine agitators ... 

Rotor speed control is an integral part of the process of rate of temperature rise. The modem mixer is generally supplied with variable speed, constant torque electric motors driving via gear reducers or by a hydraulic drive system which has a motor shaft mounted tachometer to control rotor speed. Systems that can monitor, adjust and record the mixer rotor speed provide improvement in resultant compound uniformity. Changes in rotor speed within a cycle can be programmed. 

The function of the drive shaft is to transmit power from the prime mover to the gear reducer. It operates in the humid air stream so it must... 

Fig. 6.5 Schematic view of an SSE. Its main components are a rotating screw within a stationary barrel. Polymer is fed through an inlet port and leaves the machine through a closure equipped with a die at the discharge end. Not shown in the figure are the electric motor drive and gear reducer for adjusting the rotational speed.

Fig. 10.5 Photograph and cross-sectional schematic representation of a Banbury high-intensity internal batch mixer. The photograph shows the two elements of the drive the electrical motor and the gear reducer. Their large size is due to the very large power requirements of the mixer. [Photograph courtesy of the Farrel Company, Ansonia, CT.]...

Cost of kneaders. Price includes machine, jacket, gear reducer and drive, cover, nozzles, and agitator. Motor and starter are not included in purchase price. 

Select standard speed and motor horsepower. Although design calculations have determined that an agitator speed of 65 r/min is required, only certain standard output speeds are available with typical industrial gear reducers. The closest standard speed is 68 r/min. If 68 r/min is used instead of the calculated 65 r/min, the bulk velocity will increase to about 0.42 ft/s, a change imperceptible with respect to agitator performance. 

Apart from its effect on critical speed, such an impeller will affect horsepower requirements. Furthermore, the speed change may require a new gear reducer. 

Fig. 1 shows an agitated preneutralizer for mixing phosphoric acid and ammonia in a fertilizer plant. The slurry is very thick, with a specific gravity of 1.5 to 1.6. The agitator paddle is mounted on a 14-ft-long stainless-steel shaft suspended on the output shaft of a roof-mounted gear reducer. 

Figure 2 — Extending agitator shaft to bearing, and using a fluid coupling between motor and gear reducer, prevents damage...

A metering pump consists of drive with gear reducer and a pumphead, where the gear reduces the rotary motion of the drive motor and coverts it into a reciprocating... 

Let s check the pumping rate of an HE-3 impeller, for the application of Example 10.3, operating at the same HP and close to the same torque. To be entirely fair to the HE-3 impeller, we must make the comparison at constant HP and torque, because the operating cost of an agitator is directly related to HP and the first cost (the capital cost) is closely related to its torque, which primarily determines the gear reducer cost. 

Smaller balling discs with diameters of less than 3 m are usually driven directly with variable speed drives larger discs feature motor, gear reducer, and pinion/ring gear arrangements. 

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