tailieunhanh - Five Hundred and Seven Mechanical Movements Episode 10

Tham khảo tài liệu 'five hundred and seven mechanical movements episode 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Mechanical Movements. 85 340. Another parallel motion. Beam D c gỉne. The cylinder has trunnions at its with joggling pillar-support B F which vi- upper end and swings like a pendulum brates from the center t. The piston-rod The crank-shaft is below and the piston- is connected at c. The radius-bar E A produces the parallel motion. 341. Grasshopper beam engine. The beam is attached at one end to a rocking-pillar A and the shaft arranged as near to the cylinder as the crank will work. B is the radius-bar of the parallel motion. 342. Old-fashioned single-acting beam pumping engine on the atmospheric principle with chain connection between piston-rod and a segment at end of beam. The cylinder is open at top. Very low pressure steam is admitted below piston and the weight of pump-rod etc. at the other end of beam helps to raise piston. Steam is then condensed by injection and a vacuum thus produced below piston which is then forced down by atmospheric pressure thereby drawing up pump-rod. 343. Parallel motion for upright engine. A A are radius-rods connected at one end with the framing and at the other with a vibrating piece on top of piston-rod. 344. Oscillating engine. The cylinder has trunnions at the middle of its length working in fixed bearings and the piston-rod is connected directly with the crank and no guides are used. 345. Inverted oscillating or pendulum cn- rod connected directly with crank. j . ị 346. Table engine. The cylinder is fixed on a table-like base. The piston-rod has a cross-head working in straight slotted guides fixed on top of cylinder and is con- nected by two side connecting-rods with two parallel cranks on shaft under the table. 347. Section of disk engine. Disk piston 1 seen edgewise has a motion substantially like a coin when it first falls after being spun in the air. The cylinder-heads are cones. The piston-rod is made with a ball to which the disk is attached said ball working in concentric seats in cylinder- heads and the left-hand .