Concrete Pole Mold Operation Attention

Attentions During Concrete Pole Production

The Centrifugal Spinning Machine For Concrete Pole Should Match Concrete Pole Mould 

 1. The steel of riding wheel and running wheel should match.

The spinning friction of riding wheel of centrifugal spinning machine revolves the running wheel of concrete spun pole steel mould, so the steel of both should match. Therefore, the rigidity of both should be confirmed before the order of the equipments. The supplement or update of the centrifuge machine should also pay attention to the match and it should be recorded in machine archives for the future reference.
 2. Match of the Angle between Concrete Pole Mould and Centrifugal Spinning Machine
The angle should not be too big or two little. More smaller, more shaking of the pole mould, namely the more revolving force , the more shaking of the mould . So, the angle should be

  Overhang  of both ends of pole mould should be avoided or length of overhang should be shortened

 The distance of riding wheel of centrifugals spinning machine for concrete spun electric poles usually is 2m.If the number of length of the pole mould is odd number(7,9,11m), the length of hangover of both end outside the machine is 0.5m; if the number of length is even number(6,8,12m),the length of hangover is 1m. The deflection of the hangover is in proportion to the length of hangover. Longer, the deflection is bigger and the shaking will be more obvious when spinning which will not only affects the density of concrete but also speed up the deformation, damage. To this, below measures shall be taken:
 1.when the centrifuge machine with the length of wheel distance 2m is used and the number of length of the product finished is odd number, the length of hangover of the concrete pole mould shall be controlled within 0.5m; if the number is even number, no length of hangover, namely the ends of mould are running wheels.
2. The distance of riding wheel of centrifugal spinning machine is still 2m, but if the distance of one end is changed into 1.5m and the length is even number, and the distance of running wheels of one end is also changed into 1.5m, and the length of hangover is only 0.25m; when the production length is uneven number, without 1.5m riding wheels, the length of hangover of steel mould should keep 0.5m.

 2.The deformation of concrete spun pole mould should be avoided from the improper operation

 1. The bearing platform of concrete pole mould should be at the same level.
The bearing platform of concrete pole mould means the platform bearing the concrete pole mould when operated, such as the pouring platform, link bolt platform. If the bearing platform is not flat, the wavy deformation will happen to the mould. When the bolt is fastened, the bent shape will be kept for the mould on the bearing platform.
2. The prestressed steel should be tensioned as a whole part.
3. If tensioned with single steel, every prestressed controlling value is difficult of keep same, meanwhile, the pressures born by the mould will not be consistent. The pole mould will deform when it’s worst.
3. The method of twisting the link bolts should be noted.
There are two factors of reasonable procedure for twisting link bolts. One is two sides are symmetrically operated at the same time. If one side is twisted first, then another side, then the latter one is difficult to screw up. The bolt is easy to loosen. Another is twisting from big end to small end or conversely or from the middle to the two sides.
4. Reasonable fulcrum of hanging the mould
 During production, the hoist of pole mould is usually accepted that keeping the mould horizontal by controlling the mould is ok. Actually, the flat should be the one with the guarantee of the deflection of hangover and deflection of midspan match which will usually be neglected. When confirming the location of the hanging rings of moulds, the span of hangover of mould should be equally to the bending moment of mid span. When using the steel mould whose prestress is generated by the tension with the small end anchoring the big end, the anchoring plate should be in the same position with the tensioning plate. One hanging point will be set 0.21L from the small end, and then attempt to lift the big end of the mould with steel wire rope to move to keep the mould horizontal. The mould will bend and deform after a long period of use if the flat is not on the base of equal bending moment, fitting deflection.

3. Pay much attention to link bolt 
 1. the link bolt needs improving.
The current link of mould is shown as the drawing (a). Considered in theory, the tongue and groove plate is welded closely, so the rigidity is just ok for the hoist of mould but compared to the bearing the prestressed pressure, no better than the flush plate and tongue and grooved board. There is shortage in the use of current link: one is the welding seam of link is so easy to crack that the whole link will come off; the second is the less bearing surface for the link will be worn and incline outward which resulting to the loosening of the bolt when centrifugal spinning; the third is difficult closing of the link of running wheels and the ones of the seam-closed of mould. If changed to the one as per the drawing (b), changing the close weld of the tongue and groove board to flush board, will have two advantages except overcoming the above shortages： one is the seam-closed will be more tight; another is simple manufacturing.






2. Complete the link bolts


 The shortage of link bolt will cause the space when closing the mould thus resulting to the paste-leaking. If the shortage occurs near the running wheels, the diameter of the running wheel will be expanded when spinning leading to the deformation and running out of mould. Meanwhile, there will be a impact to the riding wheel of centrifugal spinning with the frequency of 800~1000rpm when the spinning speed is 400~500rpm from the seam of running wheel.
Some people think , some vibration is allowed in the moulding of the products. Yes, that is necessary for the compactness process the initial moulding. But the later vibration will cause the compacted products cracked seam, isolation which will do harm to the products. Moreover, the impact of mould to the centrifuge machine will cause the vicious circle of damage of pole steel mould and centrifugal spinning machine.

 Production of shorter poles with longer moulds is not recommended
With no-load on one end of mould, producing the shorter poles with longer moulds will cause the run out surely. The run out will mainly cause the deforming and damage of the mould besides affecting the density.

 keep exterior clean of steel mould
During the production, the eccentric force caused by piled on residual slurry is often neglected. For example, when the work is done, some factories won’t clear away the residual slurry in the mould and when mould is hoisted away from the centrifugal spinning machine ,the residual slurry will flow outward. The accumulation of days and days will increase the attached weight of mould and then the eccentricity run out will be caused when spinning which will exacerbate the shaking of the hangover the mould which will not only affect the quality but also damage the mould easily.

  Strengthen the maintenance of centrifugal spinning machine
The centrifugal spinning machine for concrete spun pole mould and the steel pole mould interact on each other. So, if to protect the mould, the maintenance of the centrifuge machine must be strengthened. When put into normal production, there will be a specially-assigned worker for the maintenance. When holiday of the factory, concentrate more efforts on the examination, correct the deviation, eliminate the hidden danger and keep the centrifuge in good condition all the time.