Machine and its composition
The concept of the "machine" has been formed in the production practice and daily life of the quartz tube level gauge . For example, sewing machines, automobiles, machine tools, etc. are all machines. It can not only reduce a lot of physical labor and improve productivity, but also can complete some production that cannot be done by manpower.
The so-called machinery is the general term for machines and mechanisms. There are many types of machines, and their forms, structures, performances, and uses are different. Figure 0-1 shows a single-cylinder internal combustion engine. During operation, gas pushes the piston to move, and the crankshaft rotates through the connecting rod. In order to ensure the continuous rotation of the crankshaft, fuel and air are required to enter the cylinder and exhaust gas is discharged regularly. Therefore, the crankshaft drives gears, cams, push rods and valves to control the intake and exhaust. Each part of the machine has a completely determined movement, and Complete the work of converting the thermal energy of the fuel into the mechanical energy of the crankshaft rotation.
Similarly, for other machines, the same analysis as above shows that machines have the following three common characteristics.
(1) A machine is a combination of many components, and each relative moving part in the machine is called a component. As shown in the anti-corrosion level gauge 0-1, the internal combustion engine is composed of crankshaft, connecting rod, piston and other components.
(2) There is a definite relative movement between the various components that make up the machine (that is, each component moves relative to other components according to a certain law without the phenomenon of chaos in movement).
(3) Machines can replace human labor to transform mechanical energy (various prime movers) or do useful mechanical work (various working machines).
Anyone with the above three characteristics is called a machine. The mechanism with only the first two features is called the
The mechanism is also composed of many components, and each component has a certain relative movement. Different from the machine, it can work alone or convert energy. As shown in Figure 0-1, the crankshaft, connecting rod, piston and cylinder in a single-cylinder internal combustion engine are a four-member combination, which can convert the reciprocating movement of the piston into the rotary motion of the crankshaft. However, it cannot convert thermal energy into mechanical energy when used alone, so it is only a mechanism (ie, a crank slider mechanism). In order for the internal combustion engine to work, a gear mechanism driven by a level transmitter and a cam mechanism for controlling intake and exhaust must be provided.
The component is a unit that can make relative movements in the mechanism.
A component is a unit that can make relative movements in the mechanism. For example, crankshafts, connecting rods, pistons, and cylinders in an internal combustion engine are all components. A component can be a part or a rigid body connected by several parts. Is a rigid body). For example, the connecting rod is a component, but it is a whole formed by rigidly connecting the connecting rod body, connecting rod head, bolts and nuts. The connecting rod body, connecting rod head, bolts, and nuts are called mechanical parts. Mechanical parts are manufacturing units in PTFE lined level gauge machinery lined with parts, referred to as parts for short.
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