I. Hydraulic Servo Pump Motor
The hydraulic part of the quantitative pump system adopts the asynchronous motor refueling pump system. The motor drives the oil pump to absorb oil from the tank and output it under pressure. The pressure, flow rate and direction of the oil are controlled by various control valves to ensure that the working mechanism moves in the direction required by a certain force (or torque) and a certain speed. In this way, all the actions of injection moulding can be realized. The traditional quantitative pump injection machine usually needs to change the load flow and pressure, the speed of the quantitative pump is not adjustable, and the excess oil is discharged into the tank through the relief valve. A large amount of energy is lost on the valve in the form of pressure difference. The servo control system of injection moulding machine is composed of servo motor instead of asynchronous motor, gear pump (screw pump, plunger pump) instead of vane pump and servo driver. The servo control system of injection moulding machine replaces the traditional PQ valve control and adopts closed-loop control to the pressure and flow needed in production.
According to the pressure and flow signals of the injection moulding machine's computer board, the signal is converted to a given signal acceptable to the servo driver through a special conversion card. The pressure of the oil pressure system of the injection moulding machine is established by controlling the speed of the motor with the given flow signals of the injection moulding machine. The speed is closed-loop controlled by the encoder, and then the feedback signal and pressure of the pressure sensor are used. By comparing the given signals and feeding back to the controller, the PID of the controller can quickly adjust the response, so that the pressure can be stabilized at the given value and the stability of the system pressure can be guaranteed, thus the closed-loop control of the output pressure of the injection molding machine can be carried out. The servo hydraulic drive system can automatically adjust the speed and fuel supply of the oil pump according to the current working state of the injection moulding machine, such as the stages of clamping, spraying, melting, opening and ejecting, as well as the setting requirements of pressure and flow, so that the actual oil supply of the oil pump can be consistent with the actual load flow of the injection moulding machine at any working stage, so that the energy consumption of the motor in the whole changing load range can be reached. To a lesser extent, the overflow phenomenon is completely eliminated and the smooth and accurate operation of the motor is ensured.
Working Characteristics of Hydraulic Servo Pump Motor
In the start-up stage, the load of the servo pump system is very light. In order to improve the efficiency, it is necessary to push the mould to the injection position very efficiently and complete the injection quickly. However, in order to improve the forming quality in the holding stage, the inertia of the motor is needed to improve the anti-disturbance of the system. Dench's GK8 light inertia permanent magnet servo motor is a special series based on the above requirements.
List of Common Uses of GK8 Lightweight Inertia Servo Motor
II. Application of Servo Motor in Fully Electric Injection Molding Machine
All-electric injection moulding machine is a kind of processing injection moulding machine with all power supplied by electricity. Thermoplastics can be injected and processed into various moulds. It is a kind of machine commonly used in the synthesis and processing of chemical materials.
At present, Golden Agehas two schemes for all-electric injection moulding machine: belt wheel drive, GK9 series for ejection and clamping motor, and GK8 series high-speed motor for injection and pre-moulding motor.
If it is a direct drive structure, the general use of water-cooled split delivery of the GZ6 motor.
III. Electrically Pre-Plastic Motor
1）As a hybrid injection moulding machine in the electric industry, a motor dog is used instead of a part of the hydraulic system.
2）In this way, the power of the hydraulic chest pain is strong, and the corresponding characteristics are fast. At the same time, the advantages of high efficiency and energy saving of the electric system are added, which greatly improves the performance of the machine itself.
3）Electric pre-moulding mechanism is the most commonly used way of hybrid injection moulding machine in electric industry. As a hybrid injection moulding machine for electric industry,
4）A motor dog is used instead of a part of the hydraulic system, thus retaining the power of the hydraulic chest pain.
5）Correspondingly fast and efficient electric system is added at the same time.
6）The advantage of energy saving is that the performance of the machine itself has been greatly improved.
7）Electric pre-moulding mechanism is the most commonly used way of hybrid injection moulding machine in electric industry.
As a hybrid injection moulding machine in electric industry, the use of motor dog instead of a part of the hydraulic system, which retains the power of hydraulic chest pain, the corresponding characteristics of rapid, while adding the advantages of high efficiency and energy saving of the electric system, is the performance of the machine itself has been greatly improved. Electric pre-moulding mechanism is the most commonly used way of hybrid injection moulding machine in electric industry. As a hybrid injection moulding machine in electric industry, the use of motor dog instead of a part of the hydraulic system, which retains the power of hydraulic chest pain, the corresponding characteristics of rapid, while adding the advantages of high efficiency and energy saving of the electric system, is the performance of the machine itself has been greatly improved. Electric pre-moulding mechanism is the most commonly used way of hybrid injection moulding machine in electric industry.
Scheme 1: Large reducer + high power servo motor
If the preformed motor is gearbox plus high-speed motor, Dench SE-GZ6 series is a special series.
Following chart：
Scheme 2: Direct drive permanent magnet motor
In order to simplify the structure further, Golden Ageh direct drive servo motor is used.
Following chart：
