Automatic material conveying systemIn the modern injection molding industry, people strongly feel the need to automatically transport raw materials. This is because the director of the injection molding workshop can plan in advance the transportation of the raw materials needed for the processing of the injection molding machine. This need is connected with the increasingly urgent requirements to minimize the labor of the workers. It not only reduces costs, but also saves time for the transportation of raw materials. At the same time, it must be considered that the application of the central feeding system makes it possible to process bulk materials instead of bagged materials, which is considerable for saving raw materials and time and reducing costs. In addition, it is not difficult to imagine that the central feeding system will avoid the risk of "hopper emptiness" occurring from time to time. There are two types of systems for the central feeding system: pneumatic and mechanical.
The morphological changes of the raw materials to be processed, from pellets to powders, or a mixture of pellets and recycled materials. For the above-mentioned raw material forms, the screw feeder in the horizontal tube seems to be the best automated central feeding system for mechanical transport, because in the case of color or pellet size changes, this is a kind of almost self-cleaning and adjustment installation. The mechanical screw feed pump is limited to the horizontal transport of materials, but from the perspective of the feeding of a single injection molding unit, the effectiveness is undoubted.
The picture shows the central feeding system. The distance (H) can be up to several meters in length. It is connected to special equipment for mixing two raw materials (color masterbatch, recycled pellets containing a certain percentage of impact-resistant standard polystyrene, etc.).
The second mechanical system is a screw feeder, which is suitable for transporting raw materials without weight. Its conveying pipe can be bent, the minimum bending radius is about 150 meters, the length can be up to 12 meters, and can be coupled, so it can be arbitrarily long Its energy consumption is strictly limited, even higher than that of pneumatic transmission, which will be explained later.
It should be remembered that multiple outlet pipes that can be adjusted by a valve can be placed on one conveying pipe in order to supply multiple machines with the same raw material.
The central feeding system is shown in the figure. There are three (A), (B), and (C) outlets marked on the top. The raw material inlet of the conveying device starts from the storage and has a rectangular opening, as shown in the upper left of the figure.
The diagram clearly illustrates the application of a flexible screw conveyor with an outlet pipe leading to the hopper. Obviously, the storage for transferring raw materials through the conveying device should be large enough, and the amount of materials needed to hold a batch of work. Furthermore, for the change of raw materials and colors, this central feeding system has no special conversion difficulties.
The picture shows the central feeding system of a group injection molding machine. The raw materials are applied in the storage. It can be seen from the figure that the tanks that transport bulk materials are added to the storage. For example, the smaller reservoir in the picture can hold recycled materials or masterbatches, which are then mixed with raw materials in a special equipment and then sent to the injection molding machine for processing. The raw materials stored in the silo are supplied to the entire injection molding plant using one raw material and color.
However, the above recommendations can only be adopted almost when the same raw material is used, or even in gap production, where the total raw material consumption is at an appropriate percentage.The centralized feeding system adopts microcomputer centralized automatic control, which realizes the 24-hour continuous feeding operation of the pellets. Centralized feeding system manufacturer, centralized feeding system project. Tiantian automated production centralized feeding system
Application area of centralized feeding system: designed for the production of plastic products in the injection workshop, realizing uninterrupted unmanned continuous molding operation. For workshop raw material transportation and whole plant planning; to provide customers with a full range of planning and design solutions, from metering and mixing-dehumidification and drying-metering and mixing of raw material roughness-raw material storage-through the air pump to the molding machine. Realize modern workshop management.
Working principle of centralized feeding system: Roots vacuum is used as power source. Vacuum conveying method, the plastic raw materials are transferred from the storage tank to the central dehumidification and drying system through a centralized pipeline system, and then the dried raw materials are transferred to each injection molding machine.
The centralized feeding system adopts microcomputer centralized automatic control, and multiple feeding pipes are designed to ensure the diversified requirements of the main materials. The system has multiple monitoring and protection functions, and the work is safe and reliable.
The aliases of the centralized feeding system are: central feeding system, automatic feeding system, etc. Achieve 24-hour continuous feeding operation for pellets. Multiple small microcomputers separately control the coloring process of each molding machine, with accurate measurement and uniform mixing, and can flexibly change the color to meet the requirements of multiple colors and varieties of products. According to the production volume of different molding machines, the feed volume can be flexibly changed.
The centralized feeding system regenerates and uses the injection nozzle material of the injection molding machine in a fully automatic way, which can control all the feeding equipment and prevent the blocking phenomenon in the storage bin. It is fully automated by setting up a centralized monitoring station. For quality control, we insist on using high-quality cables and imported electrical components;
Ensure the stability of system equipment.
Maintenance is generally divided into four areas. The main equipment of the daily maintenance and feeding system is responsible for the implementation of special personnel responsible for the observation of the shift, recording its operation, and making registration and handover, such as the parameter setting of the central console, the operation sound of the vacuum station, and the dust treatment of the dust removal device Whether the conveying state of raw materials is smooth, whether the compressed air is within the normal value range, whether there is a shortage of materials, etc.
Monthly maintenance
Monthly inspection of the automatic central feeding system, such as the air tightness inspection of the pipeline connector, the filter cleaning of the dust removal device, the seal inspection, the air shutoff valve and the material shutoff valve inspection, and the electrical part inspection .
Quarterly maintenance
Quarterly maintenance inspections, such as the temperature rise of the fan of the vacuum station, the tightness of the conveying pipeline, the condition of the curved part, the condition of the compressed air hose, the condition of each cylinder, solenoid valve, transparent hose Situation etc.
Annual maintenance
Every year, the equipment of the automatic central feeding system is ** maintained, and the equipment is ** overhauled by holidays, and the wearing parts are replaced.
In order to improve the utilization rate of the equipment, the normal operation of the equipment is inseparable from the normal maintenance of the equipment.
Trouble shooting method
1 will not automatically suck
① Check whether the air shutoff valve of the machine, the cylinder of the cutoff valve and the solenoid valve are normal
② Check whether the compressed air source is normal, within 4KG / cm2
③ Check whether the setting of pumping time and pumping time is correct
④ Check whether the sensitivity of the photoelectric switch is normal
⑤ Check whether the selection of raw material number is correct
⑥ Check whether the barrel switch of "Setting Screen" is turned on
2 Vacuum suction barrel does not drop
① Open the upper cover of the suction bucket to see if the original stir-fry has a bridge and is stuck on the blanking opening
② Check if the evacuation time is too long
3 There is suction action, but there is no suction or the suction is not smooth
① Check whether there is any air leakage in the air shutoff valve in the negative pressure pipeline
② Check whether the filter in the pulse dust collector is blocked by dust
③ Check whether the exhaust valve on the pulse dust collector is leaking
④ Check whether the upper cover of the suction drum is closed
4 As soon as the insurance is turned on, it will blow
①Check if the solenoid valve has a short circuit
② Check that part of the insurance is burnt out, then check that part of the circuit
③ Check for short circuit
④ Check the solenoid valve of each valve for short circuit
5 The fan does not start
① Check whether the switch of each suction drum is turned on, operate in the setting screen
② Check whether the intermediate relay in the electric control box is normal
③ Check whether all suction drums are full
④ Check if the fan has been set to manual
6 Touch screen display
But unable to start the fan
① Whether the power supply has reverse phase
② Check if the fan is overloaded
③ Check whether the intermediate relay in the electric control box is normal
④ Check whether the switch of each suction drum is turned on, operate in the setting screen
7 Dry drum lack of material, abnormal
① Check whether the micro switch of the micro suction hopper on the drying barrel is normal
② Check whether the raw material barrel is free of raw materials, add the raw material barrel to the original
③ Check if the pumping time is too long
No suction bucket on 8 machine table
But the touch screen shows full material
① Check whether the sensitivity of the photoelectric switch is normal and damaged
② Check whether the photoelectric switch is not tightened or screwed tightly
③ Check if the aviation plug is plugged in
9 Abnormal material shortage in the suction barrel of the molding machine
① Check if the drying barrel is free of raw materials
② Check if the material pipe number is selected correctly
③ Check whether the pipe on the selected station is well connected
④ Check whether the sensitivity of the photoelectric switch is normal
⑤ Check whether the solenoid valve of the cutting valve is normal
10 Fan overload
① Is the power supply voltage normal 380V
② Check whether the contactor and thermal relay are normal
③ Check whether the exhaust valve and the selection valve of the fan are normal
④ Check whether the pipeline is blocked, causing excessive load
⑤ Check whether the fan is stuck and measure whether the resistance of the fan is normal
11 The system cannot boot
① Check whether the incoming power supply is 380V and whether the switch in the electric control box is turned on
② Check whether the fuse is blown, check the cause of the blow
③ Check whether the transformer is normal
④ Check whether the switching power supply is normal
No suction material on 12 machine
But the lack of material is displayed on the touch screen
① Check whether the sensitivity of the photoelectric switch is normal and damaged
② Check whether the photoelectric switch is not tightened or screwed tightly
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