The manufacture of wire and cable is totally different from that of most mechanical and electrical products. Electromechanical products are usually used to assemble parts into parts and then assemble multiple parts into a single product. The product is measured in units or pieces. Wire and cable is based on the length of the basic unit of measurement. All electric wires and cables are started from conductor processing. The outer layer of the conductor is insulated, shielded, cabled, sheathed, etc. to form wire and cable products. The more complex the product structure, the more layers are stacked.
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First, the technical characteristics of wire and cable products manufacturing:
1. Large-length continuous superposition combined production method
Large-length continuous superposition and combined production methods have an overall and controlled impact on the production of wire and cable. This involves and affects:
(1) production process and equipment layout
The various equipments in the production workshop must be discharged according to the technical process required by the product, so that the semi-finished products in each stage are transferred in turn. The equipment configuration must consider the production efficiency to be different and balance the production capacity. Some equipment may need to be configured with two or more units in order to balance the production capacity of the production line. Therefore, the fair matching of equipment and the layout of production sites must be balanced based on product and output.
(2) Production organization governance
The organization of production must be scientific, fair, accurate, and meticulous. The operator must strictly follow the process requirements. Any problems arising from any link will affect the smoothness of the process and affect the product quality and delivery. Especially for multi-core cables, if the length of a certain pair or basic unit is short, or the quality is raised, the entire length of the cable will be insufficient, resulting in scrap. Conversely, if a unit is long enough, it must be sawn to cause extravagance.
(3) Quality control
Large-length continuous superposition and combination of production methods, so that any part of the production process, an instantaneous problem, it will affect the quality of the entire cable. The more the quality defect occurs in the inner layer, and the failure to find a timely termination of production, the greater the damage caused. Since the production of wire and cable is different from that of assembled products, it can be dismantled and reassembled and parts replaced; the quality of any component or process of wire and cable is almost irretrievable and remediable for this cable. Afterwards, the treatment is very negative. It is not a matter of shortening or downgrading, or scrapping the entire cable. It cannot be opened and reinstalled.
The quality control of wire and cable must go through the entire production process. The part of the quality control inspection must be a thorough inspection of the entire production process, the operator's self-inspection, and the mutual inspection of the upper and lower processes. This is an important guarantee and means for ensuring product quality and improving the economic efficiency of the company.
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Valves are found in virtually every industrial process, including water and sewage processing, mining, power generation, processing of oil, gas and petroleum, food manufacturing, chemical and plastic manufacturing and many other fields.
People in developed nations use valves in their daily lives, including plumbing valves, such as taps for tap water, gas control valves on cookers, small valves fitted to washing machines and dishwashers, safety devices fitted to hot water systems, and poppet valves in car engines.
In nature there are valves, for example one-way valves in veins controlling the blood circulation, and heart valves controlling the flow of blood in the chambers of the heart and maintaining the correct pumping action.
Valves may be operated manually, either by a handle, lever, pedal or wheel. Valves may also be automatic, driven by changes in pressure, temperature, or flow. These changes may act upon a diaphragm or a piston which in turn activates the valve, examples of this type of valve found commonly are safety valves fitted to hot water systems or boilers.
More complex control systems using valves requiring automatic control based on an external input (i.e., regulating flow through a pipe to a changing set point) require an actuator. An actuator will stroke the valve depending on its input and set-up, allowing the valve to be positioned accurately, and allowing control over a variety of requirements.
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