On feeder misconceptions which

Misconceptions one : buy a feeder until the feeder should be some kind of test
      Test is to assess the characteristics of the feeder and the overall level of the seller is an effective way . But not just screen machinery any test can be carried out . Feeder test must

be based on your specific goals write a written plan, and should be as close to the actual situation of production conditions

Manner. Tests should be produced using the same materials , and transportation of materials in the same way . Feeders should be assessed in a number of performance when feeding

, feeder runtime might beat body surface to screening equipment detect unplanned disturbances feeder operation. Most

The feeding problems and multiple feed , and therefore the test should also simulate multiple feed feeding system . Should understand the manufacturer's device settings

experience, such as : feed several times per hour , or how much material level inside the hopper feed starts again . In addition, you should evaluate how long interval

Time to clean up the feeder . Requirements of certain pigments and additives and hopper feeders with a special plastic or highly polished steel, in order to clean up .
Misconceptions two : Feeders it can be mounted in any position extruder
       When installing the feeder to observe equipment operation environment. Vibration must be minimized , into the hopper and feeder vent line ( to prevent system blocking )

must not touch the measurement scales . If the device is surrounded by a lot of people at the event , then the feeder while driving may be affected by

To impact or falling objects on it, this time must understand measurement scale durability and replace damaged measurement scale required fees. Some scales are expensive and

difficult to buy.
Misconceptions three : Decide feeder control system engineers , rather than operatives
      Instrumentation control engineers and process engineers responsible for feeder control system selection and planning , and operatives must be involved in the detailed

design of the control system . Engineers often want to control the system with all alarm bells . Speaking from the truth this is a good idea , but the actual operation

Workers prefer the display on the control panel clear logic . Should therefore carefully consider the level of protection screen ( usually there are three levels of protection :

operator, equipment maintenance and engineering ) , or your feeding system may take a long driving time , because its control system

Difficult to debug .
Misconceptions four : weightlessness compensation vibratory feeder is too complicated, is not accurate enough
       Updated measurement scales electronic components and better logical calculus makes feeder with screw feeder or belt feeder as accurate . For fragile , brittle products, (

such as chopped glass fiber ) , vibration hopper , sometimes combined with a low-speed rotation of the screw, will be co-

Appropriate choice. 22 test proved vibrating feeder to 330 ~ 760lb / h speed filling pieces of glass for the production of slabs of glass containing 35% of nylon 66 , the

accuracy rate of 0.015% .
Misconceptions five : Only weightlessness compensation feeder supplying the liquid material can be accurately
      Liquid and solid except that the density of the liquid is kept constant at a certain temperature , its mobility hardly changed . A variable capacity pump almost to the

accuracy of ± 1% viscosity 0.5cp ~ 100000cp send any liquid , piston or diaphragm in the pumped liquid

Between 0.5cp ~ 100cp , and the gear pump pumping high viscosity liquids 100000cp . If you want to monitor the liquid feed rate , you can use a Coriolis meter or install a silo

integration into measurement scales . The former measure the fluid interference , which indicates real progress

Feed rate and feed rate exceeded the target range alarm . However, the feedback loop fluid flow control problems are usually caused by problems than it solves more than .
Misconceptions six : Feeders brand than the local agency is more important
      Can not be ignored by the seller 's agent network to provide reliable technical support. To minimize downtime , you must have a good local agent , he can be your need to

provide feeder manufacturer. Most feeder equipment manufacturers and sells a variety of common

Equipment dealers cooperation . If your equipment dealer tells you his home phone number , and when you need help , he will work with the manufacturer's headquarters is well

connected , then you should continue to work with him . Additionally, this agent should also have adequate professional skills,

When your maintenance staff needs help, he can go to the plant site to help you solve the problem.
Misconceptions seven : hopper feeders than side feed feeder money
      Typical side feed feeder hopper solids than the average multi- feeder several advantages , including durable structure , relatively high torque screw , screw and fully

engaged to transmit torque metal gear rather than nylon gears. When the hopper feeder is used as a side feed feeder

When running just three to four days will be damaged . Therefore, if the feeder vendors said his hopper feeder can be used for side feed feeder, you should ask him to issue a

feeder performance and service life of a written guarantee .
Misconceptions eight : volumetric feeder and feeder loss compensation accuracy can not be compared
      A match with the material volumetric feeder can have the same weight feeder performance , even more than the weight of mismatched feeder better performance. Loss

compensation only control and testing a feeder mechanism , if the feeder can continuously the material from

Feed hopper to the conveying screw or belt , then weight loss compensation can not overcome the feeder design flaws. Each weight loss should be compensated feeder capacity can

run to track the actual materials over time to lose weight . When evaluating the different feeding systems

, If feeder with screw feeder , in addition to weight loss compensation control to reduce system instability , but also should be examined under way in the volume of each feeder

accuracy to determine its inherent accuracy. Field control device performance can be improved to a certain extent , but

The design error was in need of rehabilitation equipment, and even need to replace another type feeder .
Misconceptions nine : If the display indicates that the feeder feeder was running accuracy of ± 1%, then everything is normal
      It should be understood feeder feed rate How to calculate . The rate of the display period of time within the hopper , the average weight loss . The longer the interval ,

the displayed speed value, the more able to hide any short-term fluctuations. When the feeder to 600rpm running, even though the number of

According to the collector ignores the short-term fluctuations , but you can not ignore this.
       Feeders determine whether the normal operation of the simplest way is to observe the drive command . Show driving directions screw feeder motor speed or belt feeder belt

speed. If the driver instructions fluctuations ± 5%, while the display shows the feeder feed rate of ± 1%,

Then the feed rate of the logical calculus will hide the short-term fluctuations.