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Technological principle and advantages of core-mold vibrating cement pipe making machine
Publish Time：
2022-12-22 10:03
Core mold vibration technology involves vertically placing inner and outer molds on a bottom tray in a pit. The hardened concrete inside the tube mold is subjected to strong vibrational forces generated by a high-frequency vibrator in the inner mold, liquefying the concrete mixture, filling the tube mold and expelling air, gradually compacting it. A forming ring is installed at the top of the tube, and it is gently rolled and compacted using hydraulic pressure. Core mold vibration technology is used in pipe manufacturing, allowing the concrete to be compacted and formed under strong vibration.
Core mold vibration technology involves vertically placing inner and outer molds on a bottom tray in a pit. The hardened concrete within the tube mold is subjected to strong vibrations from a high-frequency vibrator in the inner mold, liquefying the concrete mixture, filling the tube mold and expelling air, gradually compacting it. A forming ring is installed at the top of the tube, and it is gently rolled and compacted using hydraulic pressure. Core mold vibration technology is used in pipe manufacturing, allowing the concrete to be compacted and formed under strong vibrations.
The core mold vibration forming machine is installed underground for vertical production. The steel mold is a closed structure combining an integral inner core mold with an integral outer mold and side molds. The compaction vibration energy comes from a high-excitation integral central vibrator. The central vibrator is fixed to the inner core mold via a hydraulic device, allowing for quick mold changes. The core mold vibration forming process involves feeding and vibrating simultaneously, with vibration as the only acting force. Because the vibration force is strong and non-directional, it facilitates the free flow of concrete and mutual filling of gaps, resulting in a dense structure and high concrete strength.
The main features and advantages of core mold vibration are as follows:
(1) Underground closed vertical forming with ground control. This changes the various unfavorable factors of centrifugal and hanging roller processes in horizontal ground production, greatly improving the production and working environment, reducing worker labor intensity, and promoting safe and civilized production; (2) Using dry-hard concrete and a dry production process, with zero slump and a low water-cement ratio, resulting in high-strength concrete through high-frequency vibration; (3) High-frequency integral vibration of the inner core mold ensures that the concrete mixture is vibrated fully and evenly, resulting in high density, especially suitable for pipe jacking production; (4) After forming, the inner and outer molds can be removed immediately. Only one set of molds is needed for each diameter, greatly reducing mold investment costs; (5) No steam curing is required; plastic film can be used for covering, utilizing the hydration heat of the cement for moisture and heat retention. After 24 hours, it is hoisted to an open-air storage yard. (6) The frequency, amplitude, and excitation force of the vibration can be easily adjusted according to the production of pipes with different sizes; (7) Because it is vertical vibration forming, it can be used to form extra-large diameter pipes. With appropriate configuration, it can also be used to form shaped pipes, meeting the needs of diversified product production, such as inspection wells, box culverts, pipes with bases, and anti-corrosion lining pipes; (8) Because of vertical production, the concrete does not need to completely pass through the steel skeleton from the inside to the outside like horizontal production in centrifugal and hanging roller methods. Therefore, the concrete material is less affected by the steel bar spacing. Therefore, under the condition of steel bar matching and meeting relevant conditions, fine diameter steel bars should be selected as much as possible to reduce crack width or delay the appearance of cracks, which can adapt to the production of small spacing and dense steel bars; (9) Due to vertical production, the socket is placed at the bottom, so it is suitable for the production of socket and spigot pipes, changing the process factors of low socket strength in horizontal production; (10) High production efficiency can meet the demand for pipe materials in large-scale and emergency projects; (11) Advanced technology and equipment determine the good and stable product quality. The inner and outer molds ensure the accuracy of the inner and outer diameter dimensions of the pipe materials, extending the service life of the pipe materials and having long-term economic and environmental and social benefits.
In China, compared with centrifugal and hanging roller processes, core mold vibration is a new process with a higher degree of mechanization and automation. Although it started later, due to its special advantages, it is increasingly valued and favored by the pipe manufacturing industry.
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