Drive spring

CHART TYPE - Circular Z V Hour, Strip CHART DRIVE -Spring, Pneumatic... 

Present address 4153 Conrad Drive, Spring Valley, CA 91977, U.S.A. 

MONJU (Japan) motor drive/spring acceleration... 

CRBRP (USA) primary collapsible roller-nut drive spring assisted gravity insertion... 

To achieve the necessary thread take-up, an additional lap drum winds up the braiding thread. A stretched drive spring turns back the lap drum (Fig. 7.15). This mechanism is integrated in each bobbin (Busgen, 1993). 

FIG. S-3 Drive springs/shrouded motor option. (Source Howserve.)... 

To measure friction and shear response, one has to laterally drive one surface and simultaneously measure the response of a lateral spring mount. A variety of versions have been devised. Lateral drives are often based on piezoelectric or bimorph deflection [13, 71] or DC motor drives, whereas the response can be measured via strain gauges, bimorphs, capacitive or optical detection. 

Link-Suspended Basket Centrifuges In centrifuges with diameters larger than 762 mm (30 in), the basket, curb, curb cover, and drive form a rigid assembly flexibly suspended from three fixed posts (also known as a three-column centrifuge). The three suspension members may be either chain hnks or stiff rods in ball-and-socket joints and are spring-loaded. The suspended assembly has restrained freedom to oscillate to compensate for a normal out-of-balance condition. The drive is vertical with more efficient power transmission compared to the base-bearing type. 

National Safety Council http //www.nsc.org 1121 Spring Lake Drive Itasca, IL 60143-3201 (630)285-1121... 

This type of seal has the rotary component and face mounted outside the seal chamber. The springs and drive elements are outside the pumped liquid. This reduces the problems associated with corrosion and the accumulation of pumped product clogging the springs. This seal is popular in the food processing industry. The pumped liquid arrives to the inside diameter of the faces and seals toward the outside diameter. The environment outside the pump approaches the OD of the face union. Pressures are limited to about 35 psig. Sometimes this. seal can be mounted either inside or outside the pump. This seal is easy to install, adjust, and maintain. It permits easy access and cleaning of the pump internal parts, often required in the food processing industry. 

This dial indicator is fixed to the volute mounting adapter collar of the pump and the needle is on the shaft (Figure 14-21). The shaft should be moved radially by hand (see the arrows) up and down. Note the movement in the indicator. This is a check of the radial tolerance in the bearing. Some people use the word run out . Radial dellection causes misalignment of the rotating and stationary faces of the mechanical seal. This shortens the seal life by eausing drive pins and springs to wear and rub in relative motion. 

Note Liquid dump valves are normally fail closed to prevent giis blowby. That means that in ca.se of loss of instrument gas or air pressure, the spring will drive the valve to the closed position. However, the valve can mechanically fail because the level controller malfunctions or the seat cuts out due to solids erosion, which would cause it to fail in an open configuration. 

SPRING HOLDER ll-R CHROME 5PRING-I6-8 WORK HARDENED DRIVE COLIAR ll-l CHROME ... 

Where maintenance service is infrequent, a counterweighted, spring-loaded, or automatic idler adjustment is best suited to promote long chain life. Manually adjusted idlers, if not periodically checked for proper chain tensioning, may become a destructive source in the drive system. 

As the driving force of the mass/spring increases from zero up to the resonant frequency, the amount of transmission of the vibration increases until resonance is reached and the transmission becomes infinitely large. As the resonant point is passed, the transmission begins to reduce until at some point the transmissibility falls below one (see Figure 42.9), i.e. isolation occurs. 

The most obvious force with flexible couplings is end-play or movement in the axial plane. Both the elastomer and spring-steel devices have memory which forces the axial position of both the drive and driven shafts to a neutral position. Because of their flexibility, these devices cause the shaft to move constantly in the axial plane. This is exhibited as harmonics of shaft speed. In most cases, the resultant profile is a signature that contains the fundamental (lx) frequency and second (2x) and third (3x) harmonics. 

Most of the forcing functions generated by V-belt drives can be attributed to the elastic or mbber band effect of the belt material. This elasticity is needed to provide the traction required transmitting power from the drive sheave (i.e., pulley) to the driven sheave. Elasticity causes belts to act like springs, increasing vibration in the direction of belt wrap, but damping it in the opposite direction. As a result, belt elasticity tends to accelerate wear and the failure rate of both the driver and driven unit. 

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