A method for preparing an exhaust duct

Abstract

The invention provides a method for preparing an exhaust duct. A pouring molding cavity adapted to the shape of the exhaust duct is formed in the mold. The pouring molding cavity has a top area and a bottom area arranged up and down, and two symmetrically arranged bottom areas. The first side region and the second side region of the side, wherein, during the pouring process of the slurry, the mold is rotated around the first direction to an inclined posture at least in part, so that the plane of the bottom region in the casting cavity is in the same plane as An inclination angle is formed between the horizontal planes, and the mold vibrates continuously or periodically when the mold is in an inclined posture. In the present invention, the gas in the slurry is fully exhausted by vibrating under the tilted attitude of the mold to reduce pockmarks, pores and the like in the exhaust channel.

Description

Technical field [0001] The present invention belongs to the field of residential exhaust path technology, and more particularly to a portion of the discharging process in the exhaust track, the mold is in an inclined state and performs the vibration of the mold to achieve a gas sufficiently discharged in the slurry to reduce the exhaust trail. Production method of exhaust air in the phenomenon of sequel, air hole. Background technique [0002] The exhaust tract is a widely used building component in the residential buildings, which use the exhaust gas in the kitchen and the exhaust gas in the bathroom, and the exhaust tract is prefabricated, and it is equipped to the designated location within the building. [0003] The current exhaust tract is mostly used in pure artificial production. There is a large occupancy site, and the technical proficiency of operators is highly required, and the thickness of the thickness of the ventilation wall is difficult to control. With the develop...

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Problems solved by technology

[0008] The molding process of the exhaust channel in the prior art adopts the method of horizontal vibration, which can promote the flow of the slurry on the one hand and discharge the gas in the slurry on the other hand; however, the bottom area of ​​the casting cavity is located below the mold, The gas detached from the slurry will encounter the mold upwards. During the horizontal vibration process, this part of the gas is difficult to flow out to the left or right, and the gas that cannot be discharged is formed on the surface of the exhaust channel, causing the surface of the exhaust channel to Phenomena such as pores and pockmarks appear, and the smoothness is poor

[0009] In the prior art, there is an application of increasing the frequency of horizontal vibration. The main defect of this method is that high-intensity vibration is likely to cause segregation of the grout (concrete segregation), stratification, and uneven internal composition and structure of the grout; Excessive noise in the process can easily lead to deformation of the mold, which is not conducive to the long-term use of the mold;

[0010] In order to reduce the occurrence of pockmarks and other phenomena, there is also the application of increasing the water-cement ratio of the slurry to increase the fluidity of the slurry in the prior art. Since the overall thickness of the exhaust channel is relatively thin, generally about 15mm, the water-cement ratio of the slurry is improved. After the gray ratio, the strength of the exhaust duct will be insufficient, and it is difficult to meet the requirements of the vertical bearing capacity of the exhaust duct products specified in the industry standard; moreover, after increasing the water-cement ratio of the slurry, there are still obvious numbness. surface phenomenon

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