JPH0412156Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a crushing device built into the shield body of a mud water pressurizing shield excavator, and in particular, the present invention relates to a crushing device built into the shield body of a mud water pressurizing shield excavator, and in particular, the present invention relates to a crushing device built into the shield body of a mud water pressurizing shield excavator. The present invention relates to a water stop structure for a portion of a crushing device that penetrates a casing.

[Prior Art] A mud water pressurizing type shield excavator equipped with this type of crushing device will be explained with reference to FIG. In the figure, a support portion of a cutter wheel 3 for excavating the ground is rotatably supported via a bearing 4 on a partition wall 2 provided at the front of a shield body 1. The cutter wheel 3 is rotated via a gear connected to a drive device 5 such as a hydraulic motor. A chamber 6 for taking in excavated earth and sand is formed between the cutter wheel 3 and the partition wall 2, and a water supply pipe 7 and a mud removal pipe 8 are connected to the chamber 6 via the partition wall 2. In the vicinity of the partition wall 2 facing the chamber 6, a crushing device C is installed which includes fixed teeth 9 and movable teeth 10 facing each other and a drive device 11 that swings the movable teeth 10 with respect to the fixed teeth 9. . Fixed teeth 9 and movable teeth 10
A crushing chamber 12 for crushing gravel in excavated earth and sand is provided between the excavated earth and sand. 13 is a casing of the crushing device.

In the shield excavator described above, the gravel E in the earth and sand excavated by the cutter wheel 3 is crushed by the fixed teeth 9 and movable teeth 10 of the crushing device C and discharged from the outlet. The released crushed gravel flows into the mud drain pipe 8 together with earth and sand and muddy water.

Next, details of the conventional crushing device C will be explained with reference to FIG. The fixed teeth 9 and the movable teeth 10 are arranged inside the casing 13 of the crushing device, and the hydraulic jack 11, which is a driving device, is installed outside the casing 13.
The mud drain pipe 8 communicates with the crushed gravel outlet of the casing 13. The base end of the hydraulic jack 11 is attached to a frame 14 extending from the side wall of the casing 13.
The rod 11 is pivotally connected to the rod 11 by b.
The distal end portion of a extends through a hole 15 in the casing side wall 13a and is swingably connected to the movable tooth 10. Then, due to the expansion and contraction movement of the rod 11a,
The movable tooth 10 is designed to be able to swing relative to the fixed tooth 9 about a shaft 10a. Rod 11
a swings up and down to some extent around the shaft 11b when it expands and contracts. The rod 11a is covered with a flexible joint 16 for water-stopping, and one end of the flexible joint 16 is attached to the casing side wall 13a, and the other end is attached to a flange 17 provided closer to the inside of the rod 11a. This prevents muddy water containing gravel from leaking into the machine from the rod through hole 15 in the casing side wall 13a. The flexible joint 16
is formed into a bellows shape from a flexible material such as rubber so that it can be deformed following the expansion/contraction movement and vertical swinging of the rod 11a.

[Problems to be Solved by the Invention] In the conventional crushing device described above, since the interior of the movable joint 16 is hollow, the crushed gravel 18 crushed by the fixed teeth 9 and the movable teeth 10 enters the rod through hole. 1
The crushed debris 18 that entered the flexible joint 16 from 5 and accumulated, and was bitten when the flexible joint 16 expanded and contracted.
This damages the inner surface of the flexible joint 16 and eventually breaks it. If the flexible joint 16 is damaged, it will lose its water-stopping function and the muddy water in the chamber 6 will flow into the machine, causing the face to collapse.

An object of the present invention is to provide a crushing device for a mud water pressurized shield excavator that is equipped with a highly reliable water-stopping structure for the rod penetration part that prevents damage to seal parts due to earth and sand and crushed gravel.

[Means for Solving the Problems] The above object is to use a disc-shaped flexible body with a concentric bent part at the middle of the inner and outer peripheries as a sealing material for the rod penetration part of the casing side wall. using the flexible body, positioning the flexible body approximately perpendicular to the rod axis,
The outer circumferential part is attached to the casing side wall, and the inner circumferential part is attached to the flange on the rod, and the rod through hole in the casing side wall is covered with the flexible body. This is achieved by providing a stopper on the rod that restricts the amount of displacement of the flexible body due to water pressure.

[Function] The above-mentioned flexible body stops the muddy water inside the casing while absorbing the expansion/contraction movement and vertical swing of the rod due to its flexibility and the bending part provided at the intermediate portion. When the mud water pressure inside the casing becomes abnormally high,
A stopper provided on the rod comes into contact with the inside side of the flexible body to restrict its displacement and prevent damage to the flexible body. Further, the flexible body is located substantially perpendicular to the rod axis, and there is no place where earth and sand or crushed gravel can accumulate, so that it will not be damaged by being bitten by earth and sand or crushed gravel when the bent portion expands and contracts.

[Example] Hereinafter, an example of the present invention will be described with reference to FIG.

FIG. 1 shows the water stop structure of the rod penetrating portion, which is the essential part of the present invention, and the structure of the other parts of the crushing device is the same as that in FIG. 3, so illustration and description thereof will be omitted.

In FIG. 1, reference numeral 19 denotes a flexible body made of rubber or the like, which has a disk shape with a hole in the center, and its outer diameter is the diameter of the rod through hole 15 of the casing side wall 13a.
The inner diameter is slightly larger than the outer diameter of the rod 11a. The outer circumferential part is attached to the inboard side of the casing side wall 13a with a holding fitting 20 and bolts 21, and the inner circumferential part is attached to the flange 11b fixed to the rod 11a with sufficient water-tightness using a holding fitting 22 and bolts 23. and covers the rod through hole 15. A bent portion 19a is provided concentrically at an intermediate portion between the inner and outer peripheries of the flexible body 19. The cross-sectional shape and number of the bent portions 19a are arbitrary, as long as they can absorb the expansion/contraction movement and vertical swing of the rod 11a.

Reference numeral 22a denotes a stopper provided as a flange at the inboard end of the presser fitting 22. The stopper 2
2a is positioned so as to maintain a clearance between it and the side surface of the flexible body 19 on the inboard side in a normal state so as not to prevent the bending portion 19a from expanding and contracting. Also,
Its outer diameter is smaller than the inner diameter of the presser fitting 20, so as not to impede the expansion/contraction direction and vertical movement of the rod 11a.

With the above configuration, when the crushing device C is operated, the flexible body 19 is displaced following the expansion/contraction movement and vertical swinging of the rod 11a, thereby preventing the muddy water inside the casing 13 from leaking into the machine. Also, Stoppa 2
2a regulates the amount of displacement of the flexible body 19 when it is pushed inward by mud water pressure.

[Effects of the invention] According to the invention, the flexible body that covers the rod through hole in the side wall of the casing has no place where earth and sand or crushed gravel accumulates, so it is not damaged by earth and sand or crushed gravel and can be used as a earth and sand seal. High reliability. In addition, due to its flexibility and the bending part provided in the middle part, the flexible body can simultaneously absorb the expansion and contraction movement and vertical swing of the rod, and even when the muddy water pressure inside the casing becomes abnormally high, the amount of displacement Since it is regulated by the stopper, it will not be damaged and can withstand long-term use.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the sealing part of the crushing device according to the present invention, Fig. 2 is a longitudinal sectional view of a mud water pressurizing shield excavator equipped with the crushing device, and Fig. 3 is a cross-sectional view of a conventional crushing device. FIG. 1...Shield body, 2...Partition wall, 3...Cut wheel, 8...Sludge removal pipe, 9...Fixed teeth, 10
...Movable tooth, 11...Drive device, 11a...Rod, 13...Casing, 13a...Casing side wall, 19...Flexible body, 19a...Bending portion, 2
0, 22... Holder metal fitting, 21, 23... Mounting bolt, 22a... Stopper.

Claims (1)

[Scope of utility model registration request] A fixed tooth and a movable tooth are provided in a casing of a crushing device installed near a partition wall of a shield body, and a rod of a drive device installed outside the casing is connected to the movable tooth by passing through a side wall of the casing, The movable teeth are oscillated relative to the fixed teeth by the expansion and contraction movement of the rod, which crushes gravel in the excavated soil and discharges it into the mud drainage pipe. A flexible body with a concentric bent portion is positioned approximately perpendicular to the rod axis, and the outer circumference of the flexible body is attached to the side wall of the casing, and the inner circumference is attached to the flange provided on the rod. A stopper is installed on the rod to cover the rod through hole in the casing side wall with the flexible body, and to restrict the amount of displacement of the flexible body due to mud water pressure, facing the inboard side of the flexible body. A crushing device for a mud water pressurized shield excavator, which is characterized by: