In recent years, many injection molding machine manufacturers rushed to develop energy-saving injection molding machine with new products, especially in China, many manufacturers have introduced flaunt pump variable configuration to achieve the role of energy-saving injection molding machine. However, behind the so-called "energy saving" there is actually a limit to conditions and, if other costs must be paid, it must be carefully chosen.
Variable pump is the only choice for energy saving injection molding machine?
In fact, the injection molding machine energy saving methods are many, from special oil circuit design, hybrid (electric servo screw drive), the whole machine servo control (all electric), double pump, variable frequency motor, First, manufacturers should compare and evaluate multiple parties to choose the most energy-saving type that meets their own needs and benefits.
Variable machine must be substantially more energy-efficient than the average machine?
The principle of variable machine is to use the variable pump random station needs, provide the appropriate flow, in order to achieve the energy saving effect. However, this energy-saving effect is almost impossible to achieve when injection molding general products and thin-walled products, especially at high-speed production. Only an energy-saving product which requires a long time of high pressure holding is obvious. This is an ordinary plastic machine The factory is well known conclusion. However, its reaction speed and stability are poor, and will increase maintenance costs, reduce the negative effects of machine life, but it is unclear to many injection molding manufacturers. Because of the unclear understanding, it is easy to fall into the erroneous zone that "all products using the variable machine will be able to save a lot of energy." Therefore, when considering whether to adopt a variable energy-saving machine, it is necessary to confirm whether the product type is a product with a high pressure holding requirement. If only ordinary products or thin-walled products are manufactured by using a variable-displacement machine, the energy-saving effect becomes insignificant. In addition, in the selection of variable energy-saving machines must carefully consider the cost and cost savings is really beneficial, not just observe the surface energy-saving phenomenon, while ignoring the many hidden costs behind, including the follow-up maintenance, maintenance, machine Life, product stability and other hidden costs, if the choice of error, not only will result in obvious energy-saving effect, but also may waste money. This is the manufacturer in the selection of energy-saving injection molding machine, the most need to pay attention to.
Open loop variable displacement pump VS closed loop variable displacement pump In general, variable displacement pump is divided into two types of open circuit and closed circuit, the main difference between the two is closed loop variable pump machine stability better, but the cost is also higher than a Times, the variable pump used by early Taiwan manufacturers mostly closed loop type. At present, some mainland plastic machine manufacturers in order to save costs, the use of open loop variable pump, the price difference of doubled, resulting in many manufacturers that inexpensive, picked up cheaper, do not know "a penny, a goods" variable pump is still There are grades of advantages and disadvantages, the energy-saving effect and machine stability is very different. Therefore, special attention should be paid to the variable energy-saving machine when the type of variable-displacement pump is configured as open circuit or closed circuit because of its absolute influence on the stability of the machine. In addition, for ordinary products, the same cost of installing a variable pump to open the loop to save energy, or add semi-closed loop to enhance the stability and repeatability of the machine, is worth careful manufacturers weigh the problem.
Variable-displacement pump durability problems In general, the variable-displacement pump hydraulic system requirements for cleanliness higher than the average model, in other words, the variable-machine oil system of poor dirt resistance, and its oil road maintenance costs This is undoubtedly a major test for mainland manufacturers that have not generally been properly established for their use and maintenance practices. If improper maintenance, it is easy to cause the variable pump failure and damage, coupled with the variable displacement pump often changes, resulting in its operating life than the average quantitative pump to short, which virtually increase the cost of maintenance. In addition, many of the energy saving machines that have just been introduced are new products that have not yet been tested for actual long-term operation. Their durability and reliability have not been validated yet. And so on, are manufacturers should pay more attention to the issue of variable energy saving machine.
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