High-precision inner-cooling automatic control system

An automatic control system and high-precision technology, applied to flat products, household appliances, and other household appliances, etc., can solve the problems of not meeting the precision requirements of heavy packaging films, low product qualification rate, waste of raw materials, etc., to save raw materials and control High precision, stable and reliable operation

Inactive Publication Date: 2009-01-07
恒力石化股份有限公司
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AI Technical Summary

Problems solved by technology

At present, the domestic internal cooling automatic control system can generally only achieve the level of error within ±5mm, and the stability within this accuracy range is p...

Method used

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  • High-precision inner-cooling automatic control system
  • High-precision inner-cooling automatic control system

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Embodiment Construction

[0014] Such as figure 1 The high-precision internal cooling automatic control system shown in the hardware is composed of frequency conversion air intake fan 1, frequency conversion exhaust fan 2, frequency converter 3, ultrasonic sensor 4, controller 5 (such as PLC), and touch screen 6. The width of the product is Set value, actual value, control and operation data of air inlet and exhaust fans, P value, I value, etc. can be set and displayed on the touch screen, which is more convenient for operation.

[0015] The control principle at work is as figure 2 As shown, the material is processed and extruded by the extruder 15 and the machine head 7 to form a film bubble 12, which is clamped and flattened by the herringbone plate 13, and pulled out by the upper traction roller 14. The air duct 9 has an air inlet 10 and an air outlet 11 at the film mouth. The exhaust fan speed is given a fixed value according to the production process. Three to six ultrasonic waves from Pepperl+F...

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Abstract

The invention relates to a high-precision automatic internal cooling control system for an internal mixer. An air inlet fan and an air exhaust fan are variable frequency type fans; a fixed specified value is provided for the rotating speed of the air exhaust fan according to the production technique; three to six ultrasonic sensors are arranged on the circumference above a bubble cooling line; after a signal of distance between the ultrasonic sensors to the bubble is measured and acquired, the signal is transmitted to a controller; the actual value of the bubble breadth is calculated through the controller; the actual value of the bubble breadth is compared with the specified value of the breadth; PID operation is performed to the differential value through an amplifier; a control signal is output to an air inlet fan frequency converter; the frequency converter controls the rotating speed of the air inlet fan, so that the air inlet amount and the air exhaust amount are maintained in balance. The control system has the advantages that the operation and the use are simple, the maintenance is convenient, the running is stable and reliable, the control precision is high, a large amount of raw materials is saved for the users, and the production cost is greatly reduced.

Description

1. Technical field: [0001] The invention relates to a plastic film blowing unit, in particular to an internal cooling system of the plastic film blowing unit. 2. Background technology [0002] The internal cooling automatic control system of the plastic film blowing unit has two functions, one is to automatically control the size of the film bubble, so as to ensure the accuracy of the product width, and the other is to increase the cooling speed of the film. The width of the heavy packaging film is relatively small, generally 550mm, that is, the diameter of the bubble is only 175mm. A small bubble means a small gas storage capacity, but to achieve a better cooling effect, the gas exchange rate must be high. The difficulty of the internal cooling control of the heavy packaging unit is that, under the above basic conditions, while ensuring a good cooling effect, it is necessary to automatically control the width accuracy of the product, which directly affects the thickness of...

Claims

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Application Information

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IPC IPC(8): B29C55/28B29L7/00
Inventor 任允通闫志国王冬梅刘正梅贾连东
Owner 恒力石化股份有限公司
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