The working principle of the automatic hollow forming machine

The working principle of the fully automatic hollow forming machine is based on a quantitative pump system driven by a responsive AC servo motor. It is an advanced high-performance energy-saving system developed in recent years. It solves the performance problems of frequency conversion technology by adjusting the rotational speed and slow response speed of the hydraulic pump. At the same time, due to its operating characteristics, the power utilization efficiency is improved. As the servo motor drive system does not use a permanent magnet structure, and because the torque and inertia are closely matched, the pulsating torque is eliminated under the cooperation of the low inertia rotor, and it has a good range of dynamic response characteristics in terms of speed. Since the torque is generated by the induced current and has a high magnetic flux density, it can maintain a very low torque ripple.

At extremely low speeds, there can also be a larger fixed torque area to achieve constant flow output. The hydraulic system basically does not need cooling water, and the plastic hollow product with a long solidification time can save energy up to 80%. During refrigeration, the motor is in a stopped state, giving full play to the energy-saving characteristics and improving the precision control performance of the system. The maximum speed of AC servo motor can reach 4000r/min. Theoretically speaking, the displacement of the matched hydraulic pump can be selected according to the maximum speed, and the hydraulic pump with a smaller displacement than the ordinary system can be selected to reduce the application cost of the hydraulic pump in the system.

The principle of fully automatic hollow forming machine, the maximum speed of the general hydraulic pump is 1800r/min, and considering the high-speed noise and service life of the hydraulic pump, the working speed of the hydraulic pump should be lower than 1800r/min, and the hydraulic pump is driven by a large displacement hydraulic pump and a servo motor. Therefore, the excellent characteristics of the AC servo motor for high-speed operation cannot be fully utilized, and the cost-driven system can be improved.

Energy-saving extrusion plasticization is the most obvious technical parameter for energy-saving extrusion in order to increase the specific flow rate and reduce the specific power. The extruder of the plastic hollow machine is mainly HMWPE. If the traditional design is adopted, the plasticization efficiency is obviously insufficient. In the process of processing HMWPE powder, the plasticizing capacity of the 150/25 extruder is only 250kg/h, and the unit energy consumption is relatively high. In foreign countries, especially in Germany, many large hollow machine manufacturers have adopted IKV single-screw extruders with forced feed structure and forced cooling section structure. Under the same aspect ratio, the plasticizing capacity of the IKV extruder is increased by more than 50% compared with the traditional design, and the extrusion volume is stable. Moreover, the reasonable design of the partition and mixing section can achieve higher plasticization quality.

The principle of the automatic hollow molding machine adopts the structure of a 120mm diameter screw extruder. In the HMWPE process, 70% is the mixing condition of new materials (powder) and 30% powder, and the specific flow rate of the extruder reaches 7~8 (kg / h)/(r/min), the specific power name is 0.3(KW/(kh/h)) extruder, which belongs to high-efficiency and energy-saving type. Internationally, the plastic extrusion molding hollow plastic molding machine has adopted the "IKV" structure with forced air and forced cooling.

The plasticizing capacity of the screw is greatly improved by adopting a water-cooled closed groove feeding device, and an advanced energy-saving speed regulation system is adopted to improve energy utilization. In the past, most of the DC high-speed energy consumption or electromagnetic speed regulation technology, in recent years, began to adopt AC frequency conversion energy-saving control technology, speed range, dynamic response, intelligent control efficiency factor and power, etc. It is an unparalleled speed control method. The energy of the commutator motor of a frequency converter is 20%~30%, and an energy-saving motor slides more than 50% of plastic products, reducing electricity.

Servo synchronous motor control is a new type of energy-saving and high-efficiency extrusion and plasticization system, which has attracted more and more attention. The synchronous performance of the servo motor is almost 1, the power utilization rate is very high, and the efficiency of the asynchronous motor is about 8% higher than that of the same period. Servo speed control saves more than 30% energy.
Energy saving mechanism

In recent years, the main change in plastic hollow molding machinery is to further develop in the direction of energy saving. The clamping mechanism should have the characteristics of high precision, fast speed, large modulus, and easy operation of the mold. It is developed from the early four-plate hydraulic direct motion to the widely used four-rod