Concrete Electric Pole Forming Machine
Concrete electric pole forming machine mainly include centrifugal machine and concrete electric pole mold. Centrifuge force is generated when concrete electric pole mould spun by concrete pole centrifugal rotation machine is equal or a little higher than weight of concrete. When rotation speed continue rising, the materials in concrete is extruded around concrete electric pole mould inner wall along the centrifuge force direction to compacting formation. Its production process are 3 steps:
1. Low speed: 2-3min, concrete will be distributed along concrete electricity pole mould inner wall without collapse.
2. Medium speed:0.5-1min, it is a transition stage from low speed to high speed to prevent concrete structure damaged in centrifugal rotation process.
3. High speed:6-15min, concrete is extruded to concrete electric pole mould inner wall along the centrifuge force direction to even compacting formation and eliminate additional water.Centrifuge time and centrifugal speed of each stage is different as per to specification and type of concrete electric pole mold, its rotation speed picture is shown in picture 1:
Picture 1 concrete electric pole centrifuga machine rotation picture
Three-phase frequency variable motor is widely used for concrete electric pole centrifugal machine in concrete pole factory. Small starting current,big starting torque and speed can be controlled are the characteristics of commutator motor. But there are many deficiencies of commutator motor such as complicated structure, difficult to switch direction, high maintenance cost, complicated adjustment, difficult to adjust no-load current graph. Big sparks will generated on commutator surface when operating which will effect motor normal operation and shorten motor operating lifespan. With long time running, we found that communtator will be worn seriously with many years operation. Communtator and carbon brush should be replaced and worn almost each month, average trouble-free continuous operating time shortened and winding is easy to be burnout caused by improper adjustment which increase production cost. In addition, rotation speed changed by workers manual adjust commutator motor speed change mechanism, high human factors which can’t be guaranteed to execute production process and standard strictly when concrete pole is forming. This leaves a lot hidden danger to production quality. Thinking of the reasons above, three-phase asynchronous frequency variable motor with frequency converter are used to upgrade centrifugal concrete pole machine for concrete electric pole factory.
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