·Introduction
Injection workshop layout design is a technology, economic and environmental protection combined science. The pre-design task is to carry out a comprehensive analysis of the design project, including the process flow, the scale of production, the main equipment, logistics conditions, project external conditions, investment recovery cycle, infrastructure land area, environmental protection, designers must be in-depth production site, Carry out the necessary feasibility study. Injection workshop layout design must meet the technological requirements, production processes and logistics direction is reasonable, shared facilities and the layout of the whole plant is coordinated, the output value per unit area is high, man-machine relationship and coordination between the equipment to facilitate equipment installation and maintenance , But also to consider the further development of production lines, as well as energy saving, environmental protection, safety, lighting and so on.

·Workshop layout design
Injection workshop as a preliminary design of the main content of the workshop, it is reasonable to determine the various components and a variety of equipment, the specific location of the device. The workshop is generally composed of six parts: the production part, including a variety of injection molding machine and auxiliary equipment; auxiliary production, such as mold and equipment maintenance, back to the crushed material; warehouses, such as raw materials, semi-finished products, tools store; Management department, such as production offices, information room, quality control room, etc .; life part, such as the lounge, locker room, bathroom and so on. The so-called rational layout is to make the equipment, personnel and materials to move close to be effective, even if the production activities can be effectively carried out, but also save production costs and provide workers with a safe, comfortable and beautiful working environment.

·Workshop layout optimization
With the development of information science and technology, in the computer aided shop layout evaluation system, the evaluation parameters of the workshop are reduced to specific parameters such as logistics efficiency, equipment load rate and production cycle. These evaluation indexes and database are used to dynamically evaluate the layout of the workshop.

·Energy Conservation and Environmental Protection
1, Circulating cooling water system
Recirculating cooling water is the lifeblood of the injection molding workshop. It mainly supplies heat exchange equipment such as chiller, injection oil cooler and barrel cooler so as to meet the requirements of injection molding process for temperature control and ensure the normal operation of injection molding machine hydraulic system. To reduce the system's energy consumption, we have to design a reasonable cooling system injection workshop:
a, The use of variable frequency speed control pump operation, variable speed stepless smoothness of the system can work in the best point.
b, Based on a single chiller refrigeration compressor is intermittent operation of the characteristics of each chiller in the cooling water circuit installed on the automatic control valve. Before the operation of the compressor, open the valve so that the cooling water circuit flow; shutdown, turn off the cooling water valve.
c, Injection of oil cooler, cooler cooling water tank circuit of the solenoid valve is installed according to the oil temperature and barrel temperature were on-off control. Cooling water loop installed after the automatic control valve, greatly reducing the water consumption to achieve the purpose of saving energy and ease the injection of more than one machine or increase the number of injection molding machine caused by insufficient supply of circulating water situation.

2, Ventilation treatment
Injection workshop in the production process, produce a certain amount of harmful gases, but also accompanied by a certain amount of heat distribution, the need for a comprehensive air supply and exhaust ventilation in order to eliminate harmful gases, improve the working environment of workers. Large injection molding workshop generally high space, if the roof ventilator ventilation, harmful gas deposition along the height direction, the concentration of harmful substances in the work area is still high, while the use of large air volume ventilation fan ventilation is better, and run Energy saving.

3, Noise control
For a new injection workshop, noise control is active, it can be pre-designed in the preliminary design may be a variety of noise and vibration problems, take the necessary measures:
a, Equipment layout in the workshop should follow the principle of separate quiet, that is, the noise of high mechanical and electrical equipment together, there are key to take appropriate control measures. The use of noise in the natural attenuation of the role of transmission, to reduce noise pollution surface. In addition, in order to reduce the reverberation sound inside the workshop, the arrangement of the equipment with serious noise should be away from the sound reflecting surface (ie workshop wall), in particular, should not be placed near the corner of the workshop.
b, The sound-absorbing structure, the sound-insulating structure and the vibration-isolating device are arranged to reduce the vibration transmitted from the equipment to the foundation through the vibration-isolating device, so that the internal fixed sound is lowered. Particularly, when the injection equipment is installed on the floor, . Commonly used vibration isolation materials are steel spring shock absorbers, rubber shock absorbers, felt, air springs, a variety of composite vibration isolation device.

·Concluding remarks
If the plant is located in the suburbs, in order to simplify the plant and accelerate the progress of civil construction, it can be arranged in a plane. In order to save the land, the production workshop should be three-dimensional layout; Plant ventilation, air conditioning, dust, lifting and transportation conditions should be based on the production process requirements of the product design. In short, to the most effective and rational use of existing resources, as far as possible to learn the latest achievements in the plastics industry, and strive to create a safe and comfortable production environment, to achieve the most technologically advanced, the most cost-effective economic purposes.