Vertical machining device and method for small-caliber PCCP

Abstract

The invention discloses a vertical machining device and method for a small-caliber PCCP. The vertical machining device and method are suitable for small-caliber pipes, operation is convenient, and the sealing effect is good. The vertical machining device comprises a vertical inner die, an outer die and a pouring device. The inner die is provided with an axial straight slit penetrating through the inner die in the height direction, and two slit openings of the straight slit are fixedly connected with a movable door plate and a driven door plate respectively. The inner die is internally provided with a stretching and contracting device which comprises a drive shaft, a driven shaft, a support, a reduction gear set and at least three movable door plate driving mechanisms. According to the vertical machining device and method for the small-caliber PCCP, the stretching and contracting device and a locking device having the heights basically identical with the height of the inner die are used, wherein the heights of the stretching and contracting device and the locking device can be slightly smaller than the height of the inner die when being applied, and the stretching and contracting device is large in torque, high in evenness of force transmitted out from the driven shaft with the same rigidity and good in movement speed and synchronism. The locking device is transmitted through a screw rod, drives a sliding plate in linear movement and achieves locking of the movable door plate in the stretched state through a wedge mechanism.

Description

technical field [0001] The invention relates to a processing device and a processing method for small-diameter PCCP pipes (below Φ1000mm). Background technique [0002] Prestressed Concrete Cylinder Pipe (PCCP) is a new type of steel pipe. At present, there are two conventional methods for making PCCP dies in China: [0003] First, for the size above Φ1000mm (including Φ1000mm), the tube core is formed by vertical vibration process, and the opening and closing of the inner mold adopts the method of manual opening and closing of the inner mold; [0004] Second, for the size below Φ1000mm (that is, small-diameter PCCP pipe), the centrifugal process is adopted, because the diameter of the inner mold below Φ1000mm is too small for workers to enter the operation. At the same time, the use of centrifugal technology to form tube cores has the disadvantages of high energy consumption, inability to handle waste pulp, heavy pollution, and rough inner walls. Therefore, in the produc...

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Problems solved by technology

[0004] Second, for the size below Φ1000mm (that is, small-diameter PCCP pipe), the centrifugal process is adopted, because the diameter of the inner mold below Φ1000mm is too small, and workers cannot enter the operation

But there are problems with this structure: 1. It can only be used for large-scale inner tube mold 301a (above Φ1000mm, including Φ1000mm). less than Φ1000mm), as shown in the outline of the inner mold 301 in the figure, it is difficult to lay out; second, this scheme needs to set up multiple cylinder connecting rod assemblies at different heights, and it is well known that the pressure of the concrete slurry outside the inner mold at different heights is different

If the same cylinder assembly is used, the sealing effect of the top and bottom will be greatly different; if a cylinder assembly with an air pressure difference is used to overcome the different pressures of the gaps in the door panels of different heights, it is technically impossible to achieve

At the same time, this technical solution using cylinders needs to maintain pressure for a long time during the concrete solidification process after pouring, which makes the energy consumption and cost extremely high during use.

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