Paver screed board works

1.vibrating compaction:

      Vibrators eccentric mechanism (eccentric shaft, connecting rods) led vibrated up and down movement of the beam, the pre-compaction paving materials, vibrators stroke length selection and paving materials, ply thickness and which could be adjusted to a fixed stroke length (or single vibrator 4mm 8mm, master double vibrator vibrated 3mm, 5mm, 7mm, 9mm, vice vibrators 0,3 mm, 6mm, 9mm, 12mm).

2.pulsed vibration compaction:

      Pre-compaction paving materials is accomplished by a vibrator, and the largest of the density obtained by pulsed vibration compaction to achieve.

      By acting directly on the beam pulse vibrating cylinder pre-compaction compaction paving materials, the main difference is that with vibrators; beam size of compaction and paving materials are always in contact, compaction pressure strength of the beam does not depend on stroke length, but the compaction of the beam depending on the size and the size of the contact area of the oil pressure system. Pulse by pulse vibrations cylinder oil pressure, the compaction force is applied to the beam, and directly on the paving material.

      Oil pressure pulses generated by the pulse generator, by adjusting the drive speed of the motor pulse generator, the pulse frequency can be changed, generally adjusted to 68Hz. Liang compaction force is always the same, it has nothing to do with highly compacted beam movement, since the hydraulic pulse generates a considerable acceleration (force = mass x acceleration), so leaving compacted by a hydraulic pulse compression strength of the beam generated far greater than the pressure generated by the weight of its strength.

      According screed plate can be configured to require double or single beam pulse vibration compaction row pulse vibrating compaction beam. Only a little different compaction double beam, the smaller the contact area between the first row of the compaction of the beam, can produce a high contact pressure, the larger the contact area of the subsequent compaction of the beam in the second row, to get a compaction stability and better overlay surface.

      Two rows of hydraulic pressure compacting pulse beam, respectively in the range of 5Mpa ~ 15Mpa stepless adjustment, at the same pressure, due to the small contact area between the first row of the compaction beam, which produces a large pressure strength . Single-row and double pulse beam pulse vibration compaction compaction compaction Liang Liang consistent second row.