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Variable pump injection molding machine

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Variable pump injection molding machine, under the condition of constant speed, by changing the displacement of the hydraulic pump, at the same time the motor load will also change with the displacement to achieve the purpose of saving power. The main difference between a variable displacement pump and a standard fixed displacement pump is that the output power is different. The output power of a variable displacement pump changes with the load, while the output power of a fixed displacement pump is relatively constant. In the case of a small flow, the output power of a variable displacement pump is very low. , And the output power of the fixed pump is basically constant. In recent years, many injection molding machine manufacturers have been scrambling to develop new energy-saving injection molding machines, especially in China. Many manufacturers have launched injection molding machines that have been advertised as variable pumps to achieve energy saving. However, behind the so-called "energy saving", there are actually restrictions and other costs must be paid. They must be selected carefully.


table of Contents

1 introduction

But variable pump is the energy saving choice of injection molding machine?

In fact, there are many ways to save energy on injection molding machines. From special oil circuit design, hybrid oil-electricity (electric servo screw drive), full-machine servo control (all-electric), dual pumps, variable-frequency motors, and electrical appliances, variable pumps are just First, manufacturers should make multiple comparison evaluations and choose the type of energy saving that meets their needs and benefits.

Variable machines must be significantly more energy efficient than ordinary machines?

The principle of the variable machine is to use the variable pump to randomize the action of the table to provide an appropriate flow to achieve the effect of saving energy. However, this energy-saving effect is hardly visible in injection molding of general products and thin-walled products, especially at high speed production. This energy-saving effect will be obvious only for products that require high holding pressure for a long time. This is a general plastic machine. The conclusion that everyone knows. However, its reaction speed and stability are poor, and it will increase maintenance costs and reduce the negative effects of machine life, which are not clear to many injection molding manufacturers. Due to the unclear understanding, it is easy to fall into the misunderstanding of “variable energy consumption of all products using variable machines”. Therefore, when considering whether to use a variable energy-saving machine, you must first confirm whether the product type is a product with high pressure holding requirements. If it is a general product or a thin-walled product but is produced using a variable machine, its energy saving effect will be negligible. In addition, when choosing a variable energy-saving machine, you must carefully calculate the cost and whether the saved cost is really beneficial. You should not just observe the surface energy-saving phenomenon, and ignore the many hidden costs, including subsequent repairs, maintenance, and machinery. Hidden costs such as lifespan and product stability, if the wrong choice is used, not only will the energy saving effect be not obvious, but it may also cost you money. This is a point that manufacturers need to pay attention to when choosing energy-saving injection molding machines.

Open loop variable pump vs closed loop variable pump

Generally speaking, variable pumps are divided into two types: open-loop and closed-loop. The main difference is that the closed-loop variable pump has better stability, but the cost is doubled. The variable used by early Taiwanese manufacturers Pumps are mostly closed-loop. At present, in order to save costs, some mainland press manufacturers use open-loop variable pumps. The price is doubled. This has led many manufacturers to consider that they are cheap and cheap. According to the level of the pros and cons, the energy saving effect and machine stability are very different. Therefore, when selecting a variable energy-saving machine, special attention should be paid to whether the type of variable pump configured is an open circuit or a closed circuit, because it has a sexual impact on the stability of the machine. In addition, for common products, it is worthwhile to carefully weigh whether to install an open loop variable pump to save energy at the same cost or to install a semi-closed loop to improve the stability and reproducibility of the machine.

2 questions

Generally speaking, the variable pump has higher requirements for the cleanliness of the hydraulic oil system than ordinary models. In other words, the oil resistance of the variable oil system of the variable pump is poor, and its oil circuit maintenance costs are high. For the mainland manufacturers who have not established the correct use and maintenance habits of the machine, it is undoubtedly a major test. If improper maintenance is performed, it is easy to cause the failure and damage of the variable displacement pump. In addition, the variable displacement pump often changes the flow rate, which results in a shorter operating life than that of the regular fixed displacement pump, which invariably increases the maintenance cost. In addition, many of the newly launched variable energy-saving machines are new products that have not yet been tested for actual long-term operation. How durable and reliable they are is still not validly verified. These and other issues are issues that manufacturers should think more about when choosing variable energy-saving machines.

In summary, when measuring whether to use an energy-saving system, it is important to consider the requirements of the injection molding conditions of the produced product, the type of open and close circuits configured on the machine, subsequent maintenance costs, and correct plastic machine use and maintenance habits. The question is whether the basic performance of the press can be guaranteed. If you are considering purchasing an injection molding machine with energy-saving design, please evaluate the above points carefully. Only when you confirm that you need a product with high holding pressure and configure a closed-loop variable pump, can you achieve significant energy-saving effects and maintain the performance of the machine and Stability, after all, the purpose of installing a power-saving system is to save costs. Only by choosing energy-saving solutions that can reduce costs in the long term, can we really reduce "long-term" production costs and create competitiveness.

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