Injection molding machine having energy-saving device and inverter

An energy-saving device and injection molding machine technology, which is applied in the field of injection molding machines, can solve the problems of energy waste and slow response time, and achieve the effects of saving brake units, reliable devices, and energy saving

CN102457060AInactive Publication Date: 2012-05-16SHENZHEN INOVANCE TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2012-05-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to an injection molding machine having an energy-saving device and an inverter. The injection molding machine includes an inverter. The inverter comprises a rectification unit, an inversion unit, a direct current bus, an energy storage unit and an energy-saving unit. Two ends of the direct current bus is respectively connected to a direct current output terminal of the rectification unit and a direct current input terminal of the inversion unit. Two ends of the energy storage unit and the energy-saving unit are respectively connected to a positive busbar and a negative busbar of the direct current bus. And the energy-saving unit includes an energy storage capacitor. In addition, the invention also relates to an inverter. According to the invention, an energy-saving unit is added on an injection molding machine based on control of an inverter, thereby effectively inhibiting building up of a voltage of a bus of an inverter; meanwhile, excess energy is stored; therefore, a brake unit can be omitted and energy can be effectively saved.
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Description

technical field

[0001] The invention relates to the field of injection molding machines, and more specifically relates to an injection molding machine with an energy-saving device and an inverter. Background technique

[0002] The injection molding machine is the main molding equipment for making thermoplastic or thermosetting materials into various shapes of plastic products using plastic molding molds.

[0003] During the working process of the injection molding machine, such as sol, injection, pressure holding, mold opening and closing, thimble, etc., the motor is required to brake. When the inverter of the injection molding machine is braking with the motor load, due to the mechanical inertia, the motor is in the power generation state at this time, and the excess energy returns to the capacitor of the DC bus through the inverter, which causes the voltage of the bus to rise. The devices on the bus have a certain withstand voltage limit, and exceeding this certain limit ...

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Embodiment Construction

[0021] After investigation, the operating cost of the injection molding machine is mainly determined by the electricity cost of producing the product and the time required to produce the product. In order to improve production efficiency, each production link of the injection molding machine, such as sol, injection, pressure holding, mold opening and closing, and thimble, needs to be quickly braked by the motor. In addition, the braking of injection molding machines is different from that of cranes, elevators, and fans. Its characteristics are: frequent braking, but small braking inertia.

[0022] Based on the above problems, the present invention proposes a novel braking method, which can effectively avoid energy waste in the braking process and improve the quick response of braking. The invention replaces the brake unit with an energy-saving device on the DC bus, and stores the feedback energy of the mechanical inertia of the injection molding machine, which not only meets t...