Improved gate valve for slurry shield slurry conveyance

Abstract

The invention provides an improved gate valve for slurry shield slurry conveyance. The two ends of a through diameter valve body (10) are provided with flanges with the same diameters and are provided with inner holes D, a conduction gate plate (11) is inserted and connected into a middle gap H of the through diameter valve body (10), the upper end of the conduction gate plate is connected with a valve rod (1), the valve rod is connected with a worm wheel worm rod (3), the worm wheel worm rod (3) is connected with a hand wheel (2), the worm wheel worm rod is connected with the through diameter valve body through a valve cover (7), sealing rings (12) are respectively assembled on the left and right end surfaces of the middle gap of the through diameter valve body, a guide cover (13) is fixedly assembled at the lower end of the middle gap of the through diameter valve body, the lower end of the guide cover is assembled and provided with an end cover (15), a ball valve (14) is assembled on the end cover, through the sealing rings, slurry cannot be remained in the guide cover, the resistance cannot be generated when the conduction gate plate is upwards lifted, and the abrasion quantity of the conduction gate plate cannot be increased through closing the through diameter valve body, so the improved gate valve does not generate the slurry leakage phenomenon, and convenience is provided for the tunnel optimization construction.

Description

technical field [0001] The invention belongs to the technical field of shield tunneling, and in particular relates to an improved gate valve used for slurry transportation of mudwater shield tunneling. Background technique [0002] Mud-water shields for excavating tunnels often need to discharge a large amount of muck, which is discharged out of the tunnel through the mixing of the conveyed mud, and the gate valve is the main device for shield mud transfer. According to the excavation depth, multiple gate valves are connected to multiple conveying pipes To jointly transport mud. [0003] The gate valve specially used for the slurry transportation of the mud-water shield is different from the ordinary gate valve generally used. The ordinary gate valve controls the fluid without large impurities, while the gate valve for the mud-water shield mud transportation controls the viscous fluid containing a large amount of sand and pebbles. [0004] combine figure 1 , The gate valve...

AI Technical Summary

Problems solved by technology

[0006] 1. The bottom of the variable-diameter valve body 8 often has mud remaining. When the gate plate 6 closes the variable-diameter valve body 8 downward, the variable-diameter valve body 8 cannot be closed well, resulting in serious wear on the lower end of the gate plate 6. Diameter valve body 8 produces the main cause of slurry leakage phenomenon;

[0007] 2. Frequent lifting of the gate 6 or the impact of sand and pebbles will increase the wear of the positioning block 4 and the alloy gasket 9, and the gate 6 cannot effectively close the variable diameter valve body 8, resulting in slurry leakage;

[0008] 3. When the variable-diameter valve body 8 produces slurry leakage and the delivery pipe leaks again, it is very difficult to carry out repair welding work on the leakage of the delivery pipe, because the mud is contained in the delivery pipe. With a certain pressure, it is conceivable that it is difficult to carry out repair welding operations under the condition of mud jetting

[0009] 4. When the variable-diameter valve body 8 leaks slurry or the delivery pipe leaks, a large amount of leaked slurry will fill the tunnel, affecting the normal construction of the tunnel

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