The new sand is conveyed to the new sand storage hopper by the conveying system and quantitatively added to the old sand and new sand mixing and weighing hopper by the belt feeder under the storage hopper. Coal powder, clay and dust are conveyed to the coal powder hopper, clay hopper and dust hopper respectively by the conveying system, and are quantitatively added to the auxiliary material weighing hopper by the screw feeder under their hoppers. When mixing sand, new sand, old sand and auxiliary materials are added into the sand mixer by the weighing hopper respectively, while water is added into the sand mixer quantitatively through the water tank via the weigher. The mixed sand is discharged to the sand storage hopper and discharged to the sand belt conveyor by the feeder under the storage hopper (or directly from the sand mixer to the sand belt conveyor) and sent to the molding department for molding. The old sand moisture and temperature detector controls the amount of water added to the sand mixer, and the sand quality online detector corrects the amount of water and clay added to the sand mixer in the next mill. Some of them also control the sand compacting rate through the online sand quality detector, so as to control the amount of water added in the current mill.
2、Green sand molding equipment
2.1 Micro-vibration molding machine, is a casting machinery. It consists of micro-vibration molding part, sand compaction part and sand box ejecting part. Micro-vibration molding part by the micro-vibration motor installed under the table to complete the sand compaction part and sand box ejected part of the metal chamber instead of the cylinder piston body compressed air to push the indenter, compaction of sand, compressed air to push the top bar, ejected sand box, remove the sand, complete the modeling, the table is equipped with a spring below the table to support the table, reduce the table impact, reduce noise. The utility model has simple structure, light weight, low noise, long life, and is suitable for sand molding of small and medium-sized castings.
sanzhuji through the pneumatic micro-vibration molding machine vibration characteristics of research. Firstly, the mechanical model of the vibration motion of the pneumatic micro-vibration molding machine is established, and then the segmental difference equation of the vibration process is obtained by mathematical derivation. For the nonlinear vibration system studied in this paper, due to its sensitivity to the initial conditions, theoretically, chaotic vibrations may be generated. sanzhuji concluded experimentally that the vibration compacting of the pneumatic micro-vibration molding machine is a chaotic vibration.
The micro-vibration compaction molding machine can make high frequency and small amplitude vibration of the molding plate, sand box and sand while the sand is compacted. When the sand box is filled with loose sand, there are still many gaps between the sand grains, so the template vibrates directly and transmits energy to the sand grains to find a new equilibrium position in the continuous movement, thus filling the gaps and improving the compactness. In the compaction process, when the additional vibration continues, in addition to the above-mentioned effect, it can also make the sand particles and the sand box wall between the external friction resistance is reduced, further increasing the compaction effect. Therefore, additional vibration can significantly improve the phenomenon of uneven compactness during compaction.
Compaction with micro-vibration can also obtain higher average compactness than simple compaction, because micro-vibration can improve the fluidity of the sand during compaction, so it can obtain higher average compactness and more uniform compactness distribution than simple compaction with the same compaction ratio. Micro-vibration compaction moulding machine can not only carry out micro-vibration at the same time of compaction, but also during the process of sand addition, which is called pre-vibration before compaction. This can increase the amount of sand filling in the sand box and improve the original compactness and the uniformity of the compactness of the sand; it can reduce the height of the pre-filling frame and the stroke of the compacting piston, which is especially beneficial for the molding of high sand boxes or complex models.
2.2 Multi-contact micro-vibration molding machine autonomous leveling suspension, including a molding machine body, in the body, vertical column set on both sides of the lift regulator, and lateral distribution structure connected including side concave support suspension, rotating adjustment axis, the controller is located on the outside of the column, operation when the sand grain free fall in a certain amount in the grinding tool after starting the controller, adjust the corresponding height so that the support suspension, from the center to both sides of the glide leveling material It is set up with prompting device, and the prompting information is displayed by sound or LED light; the timing device is set up to limit the interval frequency artificially according to the speed of the material; it adopts the design of suspended and rotatable mode, which can not only effectively implement synchronous material distribution for the process of material discharge, but also adjust its installation state flexibly, which is convenient for the operator and economical and practical.
When this machine is compacted, the frame is not under pressure, but the table is hooked by four tie rods hanging down from the side of the multi-contact body, and the compaction is carried out with the downward extension of the multi-contact, if the contact, hook, sand box, type plate and table are regarded as a system, this compaction force is internal force or internal compaction. On the one hand, the contact head compacts the sand, and at the same time, it vibrates together with the table (detached from the frame, the frame is not subject to vibration). Therefore, this molding machine shock compaction effect is good, sand hardness is high and uniform (the average hardness of 85 ~ 90, B hardness meter value), sand eating amount can be as small as 20 ~ 30 mm, sand eating ratio of H: B = 2 ~ 3, and the hardness of the vertical surface of the cavity can still reach more than 80. Pneumatic multi-contact internal force compaction micro-vibration molding machine adopts spring full buffer pneumatic micro-vibration mechanism, so there is no special requirement for the foundation, the starting mold adopts connecting rod and synchronous shaft structure, pneumatic oil speed control, good synchronization of starting mold, speed control freely.
Qingdao Sanzhuji Equipment Manufacturing Co., Ltd. specializes in the production of sand reclamation equipment,foundry machines,Sand casting equipment,GS high efficiency rotary mixer,no-bake resin sand mixer,Jolt squeeze molding machine/Jolt-squeezing moulding machines,Multi- Piston Moulding Machine/Hydraulic multi-piston moulding machine,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.
