Tham khảo tài liệu 'illustrated sourcebook of mechanical components part 14', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Creative Assemblies 27-11 Double-acting actuator provides for thrust in either direction by placing two diaphragm assemblies back to back. 4 Regulating valve controls the value of air pressure by means of a diaphragm-balanced valve and two control diaphragms. 5 Double-acting pump has two diaphragms to give smooth and continuous flow of fluid to equipment at a safe working pressure. 8 Shaft seal uses lubricant pressure to force the sidewall of the diaphragm to roll against the shaft and housing. 9 Damping mechanism prevents abrupt or sudden motion in a machine. Damping amount is controlled by orifice size. 27-12 Control-Locked Thwart Vibration and Shock Critical adjustments stay put-safe against accidental turning or deliberate fiddling with them. Frank William Wood JR. 1. SPLIT YOKE clamps on shaft when eccentric squeezes ends of yoke together. Knurled knob is handy for constant use and eliminates need for tool. Another advantage is high torque capacity. But this design needs considerable space on panel. 2. FINGER springs into place between gear teeth at turn of cam. Although gear lock is ideally suited for right-angle drives size of teeth limits positioning accuracy. 3. SPLIT BUSHING tightens on control shaft because knurled knob has tapered thread. Bushing also mounts control to panel so requires just one hole. Lever like knob does away with tools but locks tighter and faster. For controls adjusted Infrequently hex nut turns a fault into an advantage. Although It takes a wrench to turn the nut added difficulty guards against knob-twiBters. Creative Assemblies 27-13 4 . CONSTANT DRAG of tapered collar on shaft makes control stiff so it doesn t need locking and unlocking. Compressed lip both seals out dust and keeps molded locking nut from rotating. 5 . . TONGUE slides In groove clamps down on edge of dial. If clamp is not tight it can scratch the face. 6. SPOT-BRAKE clamp is self-locking which means It takes two hands to make an adjustment one to hold the clamp .
