Green Sand Molding Line sand recycling equipment 2.0
1. Vibration boiling cooling device (configured with automatic temperature measurement and proportional humidification), its principle and process index characteristics are: while the hot old sand is vibrating, the hot old sand is boiled by blasting, and the hot old sand after the proportional humidification is taken away. The moisture in the sand makes the temperature of the old sand fall below 40 stably and the moisture is adjusted to 1.5%~2.5% (proportional humidification characteristics); in order to achieve the process index and the stability of the operation, solve and improve some technologies that existed before the boiling cooling device problems, take the following measures.
1.1 Automatic temperature measurement, proportional humidification characteristics (mechatronics): good temperature measurement linearity, high precision, maintenance-free, using far-infrared temperature sensor to continuously measure the temperature of the old sand, and the maximum temperature of the old sand is reduced to 40C as the standard value , 1% water needs to be added for every 25°C drop, and water is added by the instruction of the microcomputer. The opening and closing of the 4 groups of spray heads and the electromagnetic water valve with a water ratio of 8:4:2:1 can obtain 15 proportional to the temperature of the old sand. A linear digital water volume. For every 5~6C increase in used sand temperature, increase the amount of water by a number. Ensure that the automatic temperature measurement and proportional humidification system work accurately and stably.
1.2 The humidification inside the bed is adjusted to the humidification outside the bed: the temperature measurement and humidification system has two sets of temperature measurement and calculation devices to control the amount of water added to the spray, which are respectively installed on the feeder before the screening and the fluidized bed after the falling sand. Temperature measurement and humidification ensure the cooling effect of the old sand in the system. Avoid old sand particles with high water content formed by humidification in the bed.
1.3 The fine and uniform stainless steel fish scale orifice plate is punched out by fine die, as a boiling orifice plate, and the air is evenly ventilated. The wet and hot old sand can achieve boiling cooling, sufficient heat exchange and transportation, and has the characteristics of good non-stick sand cooling effect and stable productivity.
1.4 Structural design and process improvement: The host vibration boiling cooling device is a single-mass vibration conveyor that uses a vibration motor as the excitation source. The optimal design of the vibrating fluidized bed with a medium speed excitation motor and a low mechanical index (the ratio of inertial acceleration to gravitational acceleration) is selected, and the tuning ratio optimization design of the combination of rubber spring and steel coil damping spring is selected.
2. Large-scale fine crushing and screening machine The traditional large-scale hexagonal rolling crushing screen, the crushing and screening process is inverted. When the material is crushed and screened, the material is fed from the small end of the hexagonal screen cylinder, resulting in a small screening area and a large amount of material, which is not suitable for diffusion, which directly affects the crushing and screening of the material, and the crushing effect is poor. The large area of hexagonal large-end discharge, the screen area utilization rate is not enough, so choose a large screen diameter of 10~18mm or even 20~40mm to screen, resulting in the increase of particles and debris in the old sand. S43 type hexagonal fine crushing and screening machine adopts big end feeding, which makes the crushing and screening process fully reasonable. When feeding, the large-end materials are more likely to diffuse, the corresponding screening area is large, and the material screening efficiency is high. Moreover, the material has a lifting height and is easy to be broken. The crushing process has the effect of vibrating the screen, and the automatic mesh cleaning effect is good. Choose the standard supply screen 6x16mm² or 4x14mm² (2x 12mm² for the piston ring industry), which can sieve the granules of ≥3mm. Using crushing and screening in nearly 30 production lines, the recovery rate of high-pressure molding used sand has reached more than 99%. The use of cold-drawn high-hardness stainless steel wire braided screen has a service life of more than 8 years, and it is non-sticky and has good screen hole retention. The improved screen tensioning mechanism makes maintenance convenient. S43 type big-end feeding hexagonal fine crushing screen has good comprehensive economic benefits.
3. High-efficiency double-row bucket weight-hammer tensioning elevator (STD type, hereinafter referred to as double-row bucket elevator), a vertical conveyor with large lifting capacity, can meet the sand treatment of large-scale casting production lines and vertical transportation of logistics. The technical characteristics of the high-efficiency double-row bucket weight tensioning hoist are as follows:
3.1 The double-row bucket elevator adopts the form of double-row buckets left and right, up and down staggered arrangement (or four-row buckets are arranged in pairs up and down staggered). select a small hopper to achieve light material load in the hopper and staggered arrangement, so that when the upper driving head wheel rotates and discharges, the parabolic centrifugal inertia force is small, the impact and vibration are light, and the hopper is not easy to be thrown off, so a higher belt can be obtained (adopted). speed.
3.2 Wheel box (Boneng transmission products) transmission, strengthen comprehensive driving measures, so that STD double row bucket elevator has large production capacity and reliable operation, and meets the market requirements of modern casting with high productivity and high stability.
4. Elastic connecting rod vibrating conveyor The elastic connecting rod vibrating conveyor is a kind of non-inertial vibration vibrating conveyor, which has stable vibration amplitude and frequency, and has the characteristics of wide conveying trough and long conveying distance. The elastic connecting rod vibrating conveyor applied in the foundry sand processing department realizes the conveying distance of 10~18m in the enclosed vibrating conveying with ventilation hood after the sand is shaken. Since the bottom of the conveying trough is lined with tooth-shaped wear-resistant non-stick sand ductile iron lining plate, the inclination angle of the material is about 10°. The subsequent large sand shaker equipment and the scale conveyor for conveying castings: the conveyor is easy to be laid on the ground, which is convenient for Manual operation (cleaning of pouring risers and sorting of castings). The technical characteristics of the elastic link vibrating conveyor are as follows:
4.1 The excitation frequency is low (≈320 times/min), the double amplitude is large (≈30mm), and the mechanical index is low (similar to the swing conveyor), which makes the mechanical structure of the conveyor almost less maintenance.
4.2 Since the conveyed materials run in the form of advancing, 3, retreating and 1 at the bottom of the tank, and repeated friction, the wet and hot old sand is not suitable for sticking to the bottom of the tank, and the wet and hot mold is kept stable and conveyed at a constant speed over a long distance. Configuration preference.
4.3 Appropriately adjust the number of resonance springs between the upper and lower mass bodies in the middle of the mechanical structure, so that the vibrating body is far away from the resonance area, so that the amplitude is not too large, and the life of the resonance spring is increased. The resonance spring is made of high-quality spring steel 50CrVA, which is shot blasted after hot rolling.
Qingdao Sanzhuji Equipment Manufacturing Co., Ltd. specializes in the production of Green Sand Molding Line,Self-hardening sand molding line,foundry machines,Sand molding machine,Sand casting equipment,sand mixer,GS high efficiency rotary mixer,Resin sand mixer,no-bake resin sand mixer,Jolt squeeze molding machine/Jolt-squeezing moulding machines,Multi- Piston Moulding Machine/Hydraulic multi-piston moulding machine,sand casting molding machine,sand reclamation equipment，foundry molding machine,flaskless moulding machine,shot blasting machine,dust collector,according to the amount of old sand recovered Carry out plan customization, and provide sand reclamation equipment installation, commissioning, and training. Welcome guests to visit the factory.
