First, for ease of illustration, the following portable waterjet called "pre-mixed waterjet", the common traditional waterjet called "post-mixed waterjet".
The biggest difference between the two is that the different abrasive mixed mode. To illustrate the "pre-mix" was first described "post-mix". "Post-mixed waterjet" is after the high pressure waterjet nozzle, the negative pressure generated by the water jet make abrasive suction into sand mixing chamber and then through abrasive nozzle spray. "Pre-mixed waterjet" to save the high-pressure waterjet nozzle this part, set a larger capacity pressure vessel directly after high-pressure water produced in the high-pressure pump (similar to the "post-mixed waterjet" of energy storage device, but much larger), and add abrasive in this container (this is the technology key of "pre-mixed waterjet"), and then through the high-pressure pipeline transportation to abrasive nozzle.
These two kinds of waterjet technologies are different, resulting in large differences of the two technical performance. "Pre-mixed waterjet" working pressure is not suitable for too high, generally 20 ~ 50MPa, but the flow rate should not be too small, typically 8 ~ 30 L / min. The "post-mixed waterjet" working pressure generally in 200 ~ 400MPa or more, and the flow is relatively small, generally in the 2 ~ 4 L / min.
"Pre-mixed waterjet" advantages: at lower pressures, but also to achieve "post-mixed waterjet" cutting function. And because "the pre-mixed" reasons, structure of high-pressure pump portion is much simpler than the "post-mixed waterjet". Equipment failure rates and maintenance costs are much lower.
"Pre-mixed waterjet" the limitations are obvious: due to the special nature of the mixed-sand, leading to its work is intermittent. And during its working period, it is not suitable for jets frequently "on" "off".
In summary, the portable waterjet as a "pre-mixed waterjet" compare with "post-mixed waterjet" , almost no competition in the use, but a complementary relationship. Portable waterjet not suitable for CNC cutting like "post-mixed waterjet", and cutting efficiency is far less than "post-mixed waterjet". But in the wild or the random cutting task, portable waterjet come in handy. As for cutting inflammable explosive and other dangerous goods, both of which can do the job. The key depending on how many assignments and cutting thickness.
Another key is the device price: portable water jet cutting is generally equipped with simple settings, the cost is about 40,000 yuan. CNC waterjet, the most small model is 1 m * 1 m, the cost is about 100,000 yuan.
Information resource from http://www.waterjetnozzles.com.
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