Compared with dry sandblasting machine, the biggest feature of liquid sandblasting machine is that it can well control the dust pollution in the sandblasting process and improve the working environment of sandblasting operation. The structure and working principle of the liquid sandblasting machine will be introduced in detail below.
1. General composition
A complete liquid sandblasting machine generally consists of five systems, namely structural system, medium power system, pipeline system, control system and auxiliary system.
2. Working principle
Environmental protection and energy saving sandblasting machineThe grinding liquid is used as the feeding power of the grinding liquid, and the uniformly stirred grinding liquid (mixed liquid of abrasive and water) is delivered into the spray gun through the grinding liquid pump. As the acceleration power of the grinding liquid, the compressed air enters the spray gun through the air pipe. In the spray gun, the compressed air accelerates the grinding liquid entering the spray gun, and is ejected through the nozzle and sprayed to the processed surface to achieve the expected processing purpose. In the liquid sandblasting machine, the grinding fluid pump is the power supply, and the compressed air is the acceleration power.
Frozen sandblasting machine, the full name of automatic jetting frozen trimming machine, the theory of frozen sandblasting originated in Europe and the United States in the 1970s, and was later invented and improved by Showa Carbonic Acid Co., Ltd. The equipment is mainly used to replace manual rubber molded parts and precision injection molding. And die-casting products are deburred. This type of equipment has been widely used in developed countries since the end of the 1970s, and it has been gradually promoted in China since 2000 and has become one of the necessary downstream process equipment for the rubber-plastic alloy industry.
1. Simple operation: ordinary workers can operate the machine proficiently after half an hour of training, and there is an advanced automatic control system to prevent workers from misoperation.
2. High production efficiency: The average daily processing volume of a frozen sandblasting machine is equivalent to the sandblasting workload of 50-80 skilled workers.
3. High precision of sandblasting: it can remove tiny and hidden flash, not limited by product shape, high qualified rate and stable sandblasting quality.
4. It can remove flash from small rubber-plastic alloy products, brittle plastic products and magnesium alloy, zinc alloy, and aluminum alloy castings with complex structures and any shapes.
5. Do not damage the surface of the product, improve the appearance quality of the product, and increase the service life of the product.
6. It occupies a small area, only 10 square meters for a frozen sandblasting machine plus auxiliary equipment.
7. Reduce the cost of mold use and rubber material. The equipment does not need torn edges. It only requires the flash to be as thin as 0.2mm or less, the overflow groove is as small as possible, and the flash margin is only 1/5 of the tearing die -1/10.
8. Energy saving and environmental protection: The machine consumes extremely low energy, and the exhaust gas is nitrogen, the original component of air.
Rubber and plastic alloy materials are all polymer materials, and they will be in different phases at different temperatures. From the perspective of phase, the material is only a change in the mechanical state. The state changes when the material is under low temperature conditions. When it returns to normal temperature, the performance will be restored.
The freezing sandblasting machine uses the low-temperature freezing effect of liquid nitrogen to embrittle rubber-plastic alloy materials. At this time, the burr is embrittled before the product. In the time difference between the burr embrittlement and the product not yet embrittled, a high-speed jet is used. High polymer particles hit the product burrs to remove high-quality burrs from rubber-plastic alloy products and aluminum and zinc alloy products.
The physical properties of rubber-plastic alloy materials occur according to the decrease in temperature:
Hardening → embrittlement → vitrification
After the temperature drops, the rubber-plastic alloy material begins to harden, and will not be deformed or damaged below the embrittlement temperature. Its physical and chemical properties will not change after returning to normal temperature.
Folding structure composition
1. Host structure
Mainly include: feeding system, circulation system, temperature control system, and electronic control system.
2. High-speed motor and ejection wheel
The vertical projectile jet freezing sand blasting machine must use high-performance motor parts to ensure that it can drive the projectile wheel to throw projectiles at a maximum speed of 7200 rpm to hit the product burrs. Under high-speed operation, the dynamic balance error of the projectile wheel cannot be higher than 3mm, otherwise the life of the motor will be greatly reduced due to load operation.
3. Essential subsidiary system
OBD system: After testing by the authoritative department, the refrigerated sandblasting machine without OBD system can not guarantee to meet the national environmental protection requirements, and the additional OBD system can guarantee to meet the national environmental protection standards after dust removal. At the same time, the OBD system can effectively prevent the water contained in the air from flowing back into the equipment, which can ensure the long-term stable operation of the equipment, thereby extending the service life of the equipment.
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