The basic principle of resin sand thermal regeneration is to use old sand pretreatment and boiling type thermal regeneration furnace equipment. First, the old sand is crushed by vibration and magnetic separation, and then baked in a boiling regenerative furnace. After sand making, it can be reused after heat preservation, cooling and screening.
After thermal regeneration, the performance of regenerated sand is less than 0.3%, the particle size concentration rate is 80%-90%, and the gas production rate is less than 3mL/g
Boiling resin sand thermal regeneration device:
The wide application of cold core, hot core, shell core and resin sand composite core technology has greatly improved the dimensional accuracy, surface quality and yield of castings, but how to recycle the old sand that is difficult to recover by these mechanical methods has become a difficult problem. By the attention of colleagues in the industry. In the construction of Shandong Province in recent years, our institute has cooperated with relevant scientific researchers of Shandong University to jointly develop a boiling type resin sand thermal regeneration device. The factory uses these industrial wastes to save the cost of casting manufacturing and solve the problem of environmental pollution. Waste sand, while improving the quality of castings, has received significant social and economic benefits.
1. Introduction of process flow and main equipment:
The device is mainly composed of three parts: used sand pretreatment, boiling roasting (has obtained two national patents) and regenerated sand post-treatment.
The used sand pretreatment part consists of tape separator, vibrating crusher, 1# bucket elevator and used sand storage bin. The waste sand falls on the magnetic separation belt through drop box, and after the iron sand is separated by the magnetic separation pulley, it is added to the vibrating crusher, and the sand block is broken into small sand blocks or single sand particles less than 3mm, which are lifted by the 1# bucket elevator to the old sand storage bin.
The boiling roasting part consists of a disc feeder, a 2# bucket reclaimer and a boiling roasting machine. The disc feeder below the used sand storage bin will evenly and quantitatively feed the old sand, and then lift it from the 2# bucket elevator to the upper part of the furnace, and add it to the furnace for regeneration through boiling roasting.
The post-processing of the reclaimed sand consists of a high-efficiency heat exchanger and a cooling and lifting device. The high-temperature regenerated sand flows into the high-efficiency heat exchanger to reduce the sand production temperature and increase the high-pressure air temperature. The regenerated sand after heat transfer cooling is cooled and lifted by the cooling elevator and then put into storage, and the preheated high-pressure air is returned to the mixing chamber in the furnace for waste heat utilization.
The main engine of this equipment is a boiling roaster.
The working principle is that the old sand falls after being distributed by the sand separator, and the rising hot air enters the boiling chamber through the baffle for preheating, and the high temperature gas in the mixing chamber boils through several nozzles. Bake the old sand on the boiling orifice plate to burn the resin film covered by the sand to achieve the purpose of regeneration. With the continuous addition of old sand, the baking sand moves through several "∽" shapes under the action of the high and low baffles, which ensures the residence time of the baking sand in the furnace and makes the resin film fully burn. The calcined sand is further regenerated by mutual collision and friction during boiling. The fine powder in the regenerated sand is collected by the dust collector through the dust removal pipeline under the action of boiling.
2. Application:
The device has been used in 7 domestic factories, including 2 cast iron coated sand regeneration, 2 cast aluminum coated sand regeneration, 2 cast iron cold core sand regeneration, and 1 cast steel coated sand regeneration. Years of production practice have proved that the roaster has reliable operation, high thermal efficiency and remarkable energy-saving effect. Compared with new sand, the regenerated sand has a smaller expansion rate, less gas production, more round grain shape and better usability. The data detected in production are as follows.
2.1. Main technical and economic data detection of complete sets of equipment:
Productivity 1 ~ 1.5 t/h
Oil consumption (natural gas)≤20 m³/t sand (without heat exchanger)
Power consumption≤11Kwh/t sand
Reclaimed sand temperature 650~700ºC
Reclaimed sand temperature≤40ºC
Exhaust temperature≤100ºC
2.2. Reclaimed sand detection:
Combustion reduction ≤0.2%
Volume 0.087 ml/g
Particle size concentration ≥ 85% (80% of new sand)
FAQ:
Q1. Where is your factory? How can I visit it?
A : Our factory is located in Qingdao City, Shandong Province, China. You can fly to Qingdao Jiaodong Airport and we will pick you up.
Q2. Do you produce machine specific parameters according to samples?
A: Yes, we produce the machine you want according to your sample or technical drawing. Usually a machine has different sizes and technical requirements, such as sand mixing equipment, screening equipment, cooling equipment, etc.
Q3. What is your sample service?
A: If we have the ready-made machine, we can provide the sample test that the customer wants to produce, but the customer must pay the sample shipping cost.
Q4. What is the MOQ for your machine?
A: Usually our MOQ is 1 set.
Q5. Do you test all machines before delivery?
A: Yes, we do 100% testing before delivery.
Q6: How do you keep our business in a good long-term relationship?
Answer: 1. We maintain good quality and competitive prices to ensure our customers benefit;
2. We respect every customer as our friend, we sincerely do business with them and make friends,
no matter where they come from.
Qingdao Dingli Machinery Co., Ltd.
1. We are one of the manufacturers of metal casting machinery in China.
2. We produce clay sand processing equipment, resin sand recovery equipment, coated sand making equipment, coated sand regeneration equipment, sand drying equipment, dust removal equipment, conveying equipment, cooling equipment, magnetic separation equipment, screening equipment, mixing equipment Sand machine, etc.
3. Our machines are widely used to produce and process casting parts, metal castings, plumbing fittings, auto parts, brass, aluminum, zinc, cast iron production line valves, etc. Please contact us!
4.We have professional technical support and after-sales service. Has the whole line of casting machines, good quality, reasonable price and fashionable design.
Qingdao Dingli Machinery Co., Ltd. is an enterprise specializing in the production of foundry machinery and equipment. It mainly produces foundry clay sand, resin sand, coated sand, wet sand drying, lost foam, and water glass sand processing equipment. It can undertake various mechanized sand processing equipment. Design, manufacture, installation, commissioning and other turnkey projects. The factory has strong technical force and excellent process equipment. It has a long-term close technical cooperation relationship with senior experts and scholars from many domestic universities and scientific research institutions, and can provide users with excellent performance, reliable products and satisfactory services.
The company takes science and technology to develop the enterprise, quality is the foundation, continuous improvement, and customer satisfaction is the purpose.
The company mainly undertakes the following projects:
20-180t/h mechanized clay sand sand processing production line turnkey project and stand-alone supporting equipment.
Annual output of 1000-20000t castings condensed resin sand mechanized production line turnkey project and stand-alone supporting equipment.
With an annual output of 3000-10000t thermal-coated sand making complete set of equipment turnkey project and stand-alone supporting equipment.
With an annual output of 3000-7000t thermal coated sand regeneration complete equipment turnkey project and stand-alone supporting equipment.
5-15t/h water glass mechanized production line turnkey project and stand-alone supporting equipment.
5-30t/h three-pass sand drying equipment turnkey project and stand-alone supporting equipment.
5-40t/h lost foam complete set of equipment turnkey project and stand-alone supporting equipment.
Various types of clay sand horizontal molding machine, vertical molding machine.
Various types of shot blasting equipment, lifting equipment, conveying equipment, cooling equipment, magnetic separation equipment, environmental protection dust removal equipment.
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