As a weak current designer, the standardized design drawings are more conducive to project construction, reducing uncertainties in the project and avoiding errors. At the same time, as the person in charge of the project, it is necessary to look at the basis of the map in order to better communicate in the progress of the project. So, what should be included in the complete weak electricity construction drawing?
1, drawing catalog
The new drawing is first listed, and the standard drawing or reuse drawing is selected in the back row. Mark the drawing content, drawing number, and frame.
2, design instructions and legend
The design instructions are described separately for each weak electronic system. The basis of design (the original design institute's construction drawing and bidding documents), the standards to be followed, the functions and configuration of each subsystem, the construction requirements of each subsystem, the installation height of equipment and materials, the cooperation conditions with various professions, and the construction requirements should be explained. Note the main items, grounding protection content, indicate the special graphics, legend descriptions, and ordering instructions for non-standard equipment.
3, equipment material table
The sub-system lists the selection specifications, quantity, and brand of equipment materials for each system.
4, system diagram
Performance system principle, system main equipment configuration and composition, system equipment power supply mode, system equipment distribution floor or area, equipment pipeline and cable specifications, system logic and linkage relationship description. For building automation systems, it is also necessary to demonstrate the process flow and monitoring point settings of the monitored electromechanical equipment, the type of monitoring points (AI, AO, DI, DO) and the level of power supply, controller division, related electromechanical equipment and electrical control. Box number, etc.
5, plane laying diagram
The stratification shows the location, elevation, installation method, specification, orientation, elevation and laying method of the cable and pipeline, the specification and orientation of the cable, the location of the weak electric well and the material arrangement of the equipment in the well. The location of the control room.
6, weak electric well, control room layout flat, sectional view
It displays the arrangement of equipment, trunking and pipelines in the weak electric well, and controls the arrangement of the operation console, display screen and staff locker in the room. Defining the power requirements in the weak electric well, the decoration requirements in the control room, and the power requirements. Since there are fire-fighting system equipment in the weak electric well, the owner, supervision, fire-fighting and other related parties need to negotiate and determine the arrangement within the well.
7, outdoor pipeline diagram
Indicate the laying mode, buried depth, line coordinates, overhead line height, pole type, various pipeline specifications and models, parallel and intersecting coordinates and elevations of other pipelines, and the connection position with the urban or campus pipe network.
8, equipment wiring connection diagram
Wiring diagrams are required for equipment with complicated wiring outside each system, such as the controller of the building automation system, the controller of the access control management system, the parking management system, and the TV monitoring system to control the connection between indoor equipment. Background music controls the connection between indoor devices and so on. For simple wiring, please refer to the equipment manual, such as the wiring of cameras, speakers, etc.
9, electrical interface diagram
It expresses the interface mode between the building automation system and the electrical control box.
10, install a large sample
It shows the installation location and installation method of the equipment in the equipment room.

The dryer is made of cast iron, which has two ends of a hollow cylinder. It is made up of cylinder block and cylinder head at both ends. The outer diameter is mostly 1000 to 3000mm. During the running process, the steam will dry and burn the paper transported. The cast iron dryer used for paper mill is a key component of paper drying - type I pressure vessel. The number of cast iron dryers accounts for about 2/3 of the total number of pressure vessels in the paper industry. The material for making the dryer is generally HT200 and HT250. In the manufacturing of quality requirements and no penetration and large blisters, in order to increase the smoothness of the paper, the outer surface of the dryer polished inner surface turning light, keep the cylinder wall thickness is consistent, in order to ensure safety, balance and heat evenly throughout the dryer. The dryer is used to dry the paper sheets in the water, surface finishing.

The main parts of dryer include: heat pump, steam supply system, condensate recovery system, flash tank, pressure difference control system, pressure control system, flash tank, non condensable gas removal system, hot water pump, manual control program, warm up paper break startup program and so on. 

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