Foam launching device

Abstract

The invention discloses a foam launching device, which comprises an infusing pipeline, an injection pipeline, a first rubber cover, a second rubber cover and a rear cover, wherein the injection pipeline is just arranged in an embedded pipeline of a shield machine, and two ports of the injection pipeline are respectively connected to a cutter head front panel and a cutter head rear panel; the centers of the first rubber cover and the second rubber cover are respectively fixedly arranged at intervals in one port of the injection pipeline close to the cutter head front panel to form a foam jet hole, and the peripheral surfaces of the first rubber cover and the second rubber cover are just in contact with the inside surface of the injection pipeline; the rear cover is fixedly arranged on one end face of the injection pipeline close to the cutter head rear panel; the lateral surface of the injection pipeline is provided with an opening, a foam infusing port is formed at one end of the infusing pipeline, and the other end of the infusing pipeline is communicated with the opening. Through the device, slurry can be effectively prevented from refluxing to block the pipelines, stable foam jet operation is ensured, the rubber covers can be effectively prevented from being abraded, the service life of the device is prolonged, and the cost of the shield machine is reduced.

Description

technical field [0001] The invention relates to a foam launching device, which is suitable for an earth pressure balance shield machine. Background technique [0002] In the special case of very high soil viscosity during the excavation process of the earth pressure balance shield machine, foam can be injected into the soil bin. The foam is a regulating medium. In addition to improving the plastic flow of the excavated soil, the foam also has Lubricate the cutter head, cutter, and screw conveyor, reduce the cutter head torque, keep the excavation surface stable, and improve the water-tightness of the excavated soil; at the same time, the injection of foam can also effectively prevent the formation of mud cake in the center of the cutter head. [0003] Foam pipes are generally arranged inside the cutter head, and there are two common types: built-in and external. The external foam pipe is easy to clean, but it is easy to be damaged due to direct friction with the soil; the bu...

AI Technical Summary

Problems solved by technology

[0003] Foam pipes are generally arranged inside the cutter head, and there are two common types: built-in and external. The external foam pipe is easy to clean, but it is easy to be damaged due to direct friction with the soil; the built-in type is not easy to wear, but it is more difficult to clean when it is blocked.

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