In mechanical and electrical products in the application of plastic cup thermoforming machine

In mechanical and electrical products in the plastic cup thermoforming machine performance of dentsu Zhang Genjun welcome to e exhibition hall 1 injection molding machine injection molding machine, vertical injection molding machine, second-hand injection molding machine, vacuum forming machine, foam injection molding machine,. 。 。 Plastic products is easy to use, pour hot water softening, penetration, and various color, light weight, not easy broken, etc, are commonly used to in their life. Solid phase forming is a new technology of plastic forming, its characteristic is the crystallization of polymer under the plastic sheet is heated to melt crystallization temperature, the mould core tensile, compression air modified shape, made of thin wall plastic containers. Polypropylene ( PP) Plastic molding is abroad in recent years to the development of the technology. Because of the advantages of high-temperature cooking, the wet resistance, and low price, with PP as base material multi-layer barrier property of food containers especially fast, has become an important development direction of food containers. After production to all kinds of liquid, food packing sealing, sterilization and disinfection of disposable plastic container market prospect is very broad, is rapidly across its widespread use. Plastic cup machine structure and principle of plastic cup thermoforming machine referred to as 'the cup machine. Plastic cup machine main components are: to place volume frame, plastic molding materials imported conveyor system, plastic piece of heating area, products forming shear mechanism, hydraulic system, compressed air, cooling water conveying system, such as waste winding frame and electrical box. Mainly suitable for the material is PP, PS, PET, PVC, ABS, etc, the plastic piece width 510 ~ 700 mm, maximum forming area is 650 x 390 mm, maximum depth of 120 mm. Depending on the mould can be made into different shapes of products, the following is two of the product. Electrical structure on the basis of the specific electric parts can be seen in figure 4. In general, first of all, the common temperature control loop to 20 road, in the DTE can be realized, but because of the reason of selection, it's no use this device to power up to the thermostat. Next, the on and off of electric heating circuit using solid state relay. Finally, the inverter control motor for the conveyor chain track 5. 5千瓦。 Chain conveyor control accuracy requirement of less than 1 mm, the load end shaft one encoder, PLC high-speed input point read encoder position feedback pulse processing. Working process as shown in figure man-machine operation, equipment working process is divided into the following points: ( 1) The most important function of temperature control heating: equipment components. Hot forming process, according to the requirements of the product processing, the temperature will change at any time. This requires temperature should be controlled, can quickly and accurately. In the process of heating up, but not more than 5 ℃ temperature overshoot. Temperature range of 20 temperature zone of the road, each with separate heating and temperature sensor. Listed below are the temperature control of the 7 road ahead. Switch for each of them can be independent operation. Each temperature control in use or in use process for the first time appeared larger deviation, all need to perform a PID setting. Below setting operation picture, in which each can separate setting all the way. Because of the reason, on the selection of the equipment of temperature controller for the products, and in HMI via RS485 communication control. （ 2) Action process. 'Clamping', 'shearing' and 'mould' action to control the hydraulic cylinder of the hydraulic pressure station, the current is more widely used driven CAM these three actions. But has to the trend of the development of the hydraulic pressure, because of relatively concave wheel mechanism, hydraulic control is more flexible and portable, can improve the production capacity. （ 3) As shown in figure operation picture, in every action, there is a 'ceiling' and 'lower limit' setting, function for setting the action in the simulation of a certain Angle of CAM mechanism. Because such devices traditional mode of operation for the CAM mechanism, 'mode', 'shearing' and 'mould' period one week of the CAM movement, and the CAM mechanism to drive a CAM encoder feedback current Angle, other movements around the world have the freedom to define in any Angle of the CAM movement. This device using hydraulic cylinder instead of the CAM, but similar to the CAM requirements for operating mode is still operating mode, so here inside the PLC made a simulation of the CAM operation method, specific time, the method is as follows: first of all, the equipment and processing speed of 30 d/minutes, namely take 2 seconds per model, namely, 2 seconds a movement process equipment are action is complete, in this way, the PLC and hydraulic cylinder precision equipment and processing speed. Second, 2 s / 3600 = 5. 5 ms, with PLC internal timer to simulation the Angle of CAM, precision is 5. 5 ms/degrees, that is, if the device per minute to reach 30 mold processing speed, PLC scan cycle must be less than 5. 5 ms, to guarantee the output of the PLC to control the accuracy of each part. Finally, man-machine interface is shown in the upper and lower limit is set to the point of view, the corresponding internal timing for PLC, which can be set within the scope of the time all of the above actions. Example: tensile set limit to 70 degrees, the lower limit of 60 degrees, the PLC controller internal processing order: equipment at the beginning of each movement cycle with timing starts a timer, stretching technique for 60 70 degrees in action, is when the machine cycle 333. 3ms( 60×2s/3600) - 388. 8 ( 70×2s/3600) Passed Y point output, stretching movements. Through optimize the PLC program, scan cycle control within the 5 ms, equipment processing speed can reach 32 mold/minutes of processing speed. Summed up the current system cup machines used in temperature control and the controller, the main supply brand to Calais. In the mechanical and electrical products in the thermoforming industry of an attempt, basic functions to achieve the customer's requirements, is in good operation.
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