(1) summary of technical solutions
1. the equipment adopted in this system is suitable for clay sand process and is suitable for producing cast iron castings.
Conditions of use of the system
Power supply: 3AC 380V 50HZ
Water source: 0.2Mpa ~ 0.3Mpa
Compressed air: 0.4Mpa ~ 0.6Mpa
Ambient temperature: 0 ~ 40 C
Relative humidity: less than 90%
The maximum sand temperature of the knock-out machine is less than 250 degrees.
Production program: 20t/h (clay sand cast iron production line)
2. the design principles and comprehensive technical and economic indicators of the scheme.
The design of the scheme is based on the following principles:
The system configuration fully considers the current situation of the enterprise and the market characteristics faced by the enterprise. It not only takes into account the development stage of the enterprise, but also has better market adaptability and technology research and development capability.
Considering the production characteristics of the enterprise, the factors such as production organization, equipment maintenance and waste disposal are taken into account in the overall layout of the equipment, which is conducive to production management, equipment maintenance and logistics smoothness, bringing convenience to the future production and maintenance.
In equipment selection and configuration, the principles of safety, reliability, low cost and environmental protection should be taken into consideration. Under the conditions of ensuring the suitability for casting production environment and production characteristics and meeting the requirements of process quality, the equipment installed capacity should be reduced as far as possible, the equipment reliability should be improved, the number of vulnerable parts should be reduced, the equipment used cost and the consumption of raw materials should be reduced, and the economic benefit should be improved. Good foundation.
In system configuration, we try our best to meet the requirements of flexible production organization, so that we can reasonably select the start-up and stop of system equipment according to different process requirements and different links of production in the production process without affecting the normal operation of the system, reducing production costs and facilitating production organization.
L To meet the requirements of social progress and environmental protection, under the premise of guaranteeing process quality, production organization and economic benefits, the scheme strives to put the requirements of environmental protection and improvement of production environment in an important position, laying a foundation for improving the casting image from the system configuration and layout.
L effectively utilizes space, rationally configuring equipment, reducing basic cost, and reasonably reducing construction cost.
(two) sand reclamation process and main configuration description (see programme plan)
1. new sand addition
The new sand is lifted from bucket elevator to storage new sand bucket.
2. sand knockout machine and old sand recovery system
After pouring and cooling, the mold is sent to the sand treatment system by the percutaneous belt conveyor with inertial vibrating sand shedding machine.
3. old sand crushing regeneration system
The used sand after falling sand by the inertial vibrating sand drop machine is conveyed by the belt conveyor to the fine hexagonal sand screen machine for crushing and sieving the sand. The sand is evenly added to the vibrating boiling cooling bed by the belt feeder (which is equipped with a temperature and humidifying device above the belt feeder and spraying water through the infrared probe to achieve the purpose of humidifying and cooling the sand). After cooling and cooling, the old sand is broken and screened by bucket elevator, and the sand grains are temporarily stored in the transitional hopper and lifted from the bucket elevator to the next step.
4. dust removal system
For clay sand technology, good dust removal is not only the requirement of environmental protection, but also the production process and quality level.
Requirements and directly affect the production cost, so the design and layout of its dust removal system should be paid more attention.
5. electrical control system
5.1 Electric control system controls all the equipment from the start of sand dropping to the sand adding bucket of molding line. It can be operated automatically by interlocking of the whole system, and can also be operated independently by units. The control is manual and automatic switching. The sealing of the electric cabinet shell adapts to the working environment of the foundry workshop. All power cables and control cables are strengthened to ensure the safety and reliability of use. The electric cabinet is equipped with touch screen to display the working condition of the equipment and has the function of fault self-diagnosis. It is convenient to use and maintain, and the electronic control system has wide adaptability and long-term high reliability. The system control has a start-up alarm device, and a control torque station is installed near the main equipment and underground tunnel, which is convenient for equipment debugging and maintenance, and is also conducive to safe emergency shutdown.
Control of sand mixing system: touch screen is set on the electronic control to display the amount of material added and operation button, new and old sand is controlled by electronic weighing according to the ratio, pulverized coal clay passing time is quantified, water adding of sand mixer and the order of new and old pulverized coal clay is added by PLC, belt conveyor and bucket elevator tail wheel is equipped with inspection Measuring function (such as skidding, overload, belt breakage, etc.), design and installation of electronic control system, fully conform to the national GB / T5226.1 standard, the main line set corresponding branch box, control line additional equipment line, easy to improve and maintain.
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