JPH0412155Y2 - - 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-like 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 provide a seal case that holds multiple stages of seals that are in sliding contact with the outer periphery of the rod of the drive device, and has a greasing groove between the seals, and a side wall of the casing of the crushing device. Alternatively, a vibration absorber is interposed between the rod and the protrusion, and the vibration absorber is attached at one end to the seal case and the other end is attached to the side wall of the casing or the protrusion, and deforms in accordance with the vertical swing of the rod. This is achieved by covering the portion of the vibration absorber facing the face side with a stretchable flexible body.

[Function] The expansion and contraction movement of the rod is absorbed by the sliding contact between the rod and the seal, and the vertical movement of the rod is absorbed by the deformation of the vibration absorber, so the seal is always kept in close contact with the outer periphery of the rod and muddy water is prevented. Water can be stopped. The seals are held in the seal case and are arranged in multiple stages with greasing grooves in between, so only the seals located on the face side come into contact with the dirt inside the casing, and the seals located closer to the inside of the machine come into contact with the dirt inside the casing. Other seals are not subject to wear and damage from dirt and debris. Further, since the portion of the vibration absorber facing the face side is covered with a flexible body that can be expanded and contracted, the vibration absorber is not subject to wear or damage due to earth and sand or crushed gravel. Therefore, it is possible to maintain the water stop function for a long period of time.

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

FIG. 1 is a view showing the water stop structure of the rod penetrating portion, which is the main part of the present invention, and the configuration of other parts of the crushing device is the same as that in FIG. 4, and illustration and description thereof will be omitted.

In the figure, 19 is a cylindrical holder that protrudes from the casing side wall 13a toward the inside of the machine, and its inner diameter is the same as the through hole 15 drilled in the casing side wall 13a. is open.

Reference numeral 20 denotes a vibration absorber, which is a cylindrical body consisting of an outer flange portion 20a, an inner flange portion 20b, and a body portion 20c connecting these two flange portions, and is made of a flexible material such as rubber. A mounting hole is formed in the outer flange portion 20a so as to match the screw hole 19a of the holder 19, and the outer diameter of the outer flange portion 20a is slightly smaller than the outer diameter of the holder 19. The outer diameter of the body part 20c is smaller than the outer diameter of the outer flange part 20a and even smaller than the inner diameter of the holder 19 to provide a gap between the holder 19 and the body part 20c to absorb the vertical swing of the rod 11a. I have it. The inner diameter of the inner flange portion 20b is smaller than the inner diameter of the body portion 20c, and a plurality of mounting holes are formed in the flange portion.

Reference numeral 21 denotes a presser metal fitting for attaching the vibration absorber 20 to the end surface of the holder 19;
This metal fitting has an L-shaped cross section and has a collar 21a attached to the outer periphery of a disc with a hole slightly smaller than the inner diameter of c. The inner diameter of the collar 21a is the outer flange portion 20 of the vibration absorber 20.
The outer diameter of the collar 21a is larger than the outer diameter of the holder 19, and the outer diameter of the collar 21a is approximately equal to the outer diameter of the holder 19. This holding bracket has mounting holes that match the screw holes 19a of the holder 19 and the mounting holes of the outer flange portion 20a of the vibration absorber 20. 19
and attach it tightly to the end face of the holder 19 with bolts 22.

Reference numeral 23 denotes a seal case, which is inserted inside the vibration absorber 20 and has multiple stages (two stages in the illustrated example) on its inner circumference.
The seals 24, 24' are retained. Seal 2
For example, rubber seals having a U-shaped cross section are used as 4 and 24'. A greasing groove 23a is provided in the land between the seal 24 and the seal 24'. A grease hole connected to a grease injection pipe 25 on the inner side end surface of the seal case 23 communicates with this greasing groove 23a, and grease is injected by a grease pump (not shown). The outer diameter of the seal case 23 is slightly smaller than the inner diameter of the body portion 20c of the vibration absorber 20, and the end portion on the face side has a stepped shape with a smaller diameter than the inner diameter of the inner flange portion 20b of the vibration absorber 20. The length of this stepped portion 23b is slightly smaller than the thickness of the inner flange portion 20b. Further, a plurality of mounting holes are formed in the stepped portion 23b so as to match the mounting holes of the inner flange portion 20b.

Reference numeral 26 denotes a ring-shaped holding plate, the inner diameter of which is slightly larger than the inner diameter of the seal case 23, and the outer diameter approximately equal to the outer diameter of the body portion 20c of the vibration absorber 20. Presser plate 2
The inner flange part 20 of the vibration absorber 20 is located in the middle part of 6.
A plurality of screw holes are drilled so as to match the mounting holes drilled in the seal case 23 and the inner flange portion 20b, and the inner flange portion 20b is sandwiched between the holding plate 26 and the stepped portion 23b of the seal case 23. bolt 27
It is attached in close contact with the seal case 23.

In the gap between the inner periphery of the holder 19 and the outer periphery of the body 20c of the vibration absorber 20, there is a packing 28 made of a flexible body that can be expanded and contracted to prevent dirt and crushed gravel from entering.
The portion of the vibration absorber 20 facing the face side is covered with packing 28. This patch king 28
As a material, single-cell sponge rubber, etc., which does not absorb muddy water, is used.

29 is a sliding collar fixed to the outer periphery of the rod 11a of the hydraulic jack 11 so as to be sufficiently watertight;
The outer periphery becomes a sliding surface for the seals 24, 24', and the outer periphery is hardened. This sliding collar 29 is used as a replacement part to facilitate maintenance when worn, but this part may be omitted and the outer periphery of the rod 11a may be used as a direct sliding surface.

Reference numeral 30 denotes stoppers for regulating the amount of expansion of the vibration absorber 20 due to sliding resistance, and is attached to a plurality of locations on the circumference of the inner peripheral portion of the holder 19. Its attachment position is determined with a slight clearance between it and the presser plate 26.

In FIG. 1, the rod 1 of the hydraulic jack 11 is
When 1a is expanded or contracted, the sliding collar 29 moves to the seal 2.
4, 24'. At this time, the vertical swing of the rod 11a about the shaft 11b in FIG. absorbed by. That is, the seals 24, 24', while swinging up and down together with the rod 11a, only make sliding contact with the sliding collar 29 in response to the movement of the rod 11a in the direction of expansion and contraction. Therefore, good contact between the seals 24, 24' and the sliding collar 29 is maintained, and muddy water does not leak into the machine along the sliding surfaces.
Since the seal case 23 moves following the vertical swing of the rod 11a, the gap Δl between the inner periphery of the seal case 23 and the outer periphery of the sliding collar 29 is kept small to prevent dirt and crushed debris from getting caught. is possible,
The grease injected into the greasing groove 23a not only lubricates the sliding surfaces, but also serves to prevent dirt from entering between the seals 24, 24' and the sliding collar 29.

Furthermore, when the vibration absorber 20 moves up and down, the packing 28 filled in the gap between the body 20c and the holder 19 also expands and contracts following the vertical movement of the vibration absorber 20. This prevents dirt and crushed gravel from entering the gap between the body portion 20c and the holder 19. When the vibration absorber 20 is about to be extended abnormally due to the sliding resistance of the seals 24, 24', the holding plate 26 hits the stopper 30, and when it is about to be shortened, the presser plate 26 hits the inboard end surface of the seal case 23. comes into contact with the presser fitting 21 to regulate the amount of expansion and contraction of the vibration absorber 20 and prevent abnormal expansion and compression.

Next, another embodiment of the present invention will be described with reference to FIG. This figure also shows only the water stop structure of the rod penetration part, and the same parts as in FIG. 1 are given the same reference numerals. In the figure, reference numeral 31 denotes a vibration absorber, which is made of a flexible body such as rubber formed in a cylindrical shape and has outward flange portions 31a and 31b at both ends. A hole is drilled. The flange portion 31a at one end is tightly attached to the inboard side of the casing side wall 13a by a holding metal fitting 32 and bolts 33, and the flange portion 31b at the other end is tightly attached to the flange portion of the seal case 23 by a holding metal fitting 34 and bolts 35. installed. The inner diameter of the vibration absorber 31 is larger than the outer diameter of the sliding collar 29, and a gap is provided therebetween to absorb the vertical swing of the rod 11a. Note that the seal case 23 holds multiple stages of seals 24, 24' like the seal case 23 shown in FIG. 1, and has a greasing groove 23a between the seals 24 and 24'. Greasing groove 23 is passed through the grease injection pipe 25 and the grease hole of the seal case 23.
Grease is injected into a.

36, 36' are ring-shaped bushes inserted and fixed into the inner periphery of the seal case 23, and the sliding collar 29
Seal 2 is made of a material that is softer than the surface hardness of
4 and 24' (the drawing shows an example where the seals are mounted on both outer sides of the seals 24 and 24'). The inner diameters of the bushes 36, 36' are slightly larger than the inner diameters of the seals 24, 24', and when the vertically swinging rod 11a moves upward, for example, the upper parts of the seals 24, 24' are crushed, and the lower parts of the seals slide by that amount. The inner diameter size is such that the crushing margin of the seals 24, 24' is restricted so that no gap is created between the seals 24 and the movable collar 29.

Reference numeral 37 denotes a packing made of a stretchable flexible body filled in the gap between the outer periphery of the sliding collar 29 and the inner periphery of the vibration absorber 31, which covers the inner periphery of the vibration absorber 31 facing the face side. This prevents dirt and debris from entering the gaps.

Reference numeral 38 denotes a stopper for regulating the amount of axial expansion and contraction of the vibration absorber 31 due to the sliding resistance of the seals 24 and 24'. They are positioned so as to cover them in a concave manner with a gap, and are attached to stays 39 protruding from the casing side wall 13a, and are provided in plural on the circumference around the rod 11a.

This embodiment differs from that shown in FIG. 1 only in the shape and arrangement of parts, but has the same functions and effects.

[Effects of the invention] According to the invention, the expansion and contraction movement of the rod is absorbed by the sliding contact of the seal, and the vertical vibration is absorbed by the deformation of the vibration absorber, so that the rod sliding surface and the seal are always kept in close contact. , it is possible to eliminate leakage of muddy water into the inside of the machine. In addition, by arranging seals in multiple stages and providing greasing grooves between the seals, we prevent wear and damage to the seals due to earth and sand and crushed debris.
On the other hand, the part of the vibration absorber facing the face side is covered with a flexible body that can be expanded and contracted to protect it from wear and damage caused by earth, sand, and crushed debris, which increases the durability of the seal and vibration absorber. It is possible to increase the reliability of the water stop function.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the sealing part of the crushing device according to the present invention, Fig. 2 is a sectional view showing another embodiment, and Fig. 3 is a sectional view of a mud water pressurizing shield excavator equipped with the crushing device. The vertical sectional view, FIG. 4, is a sectional view of a conventional crushing device. 1...Shield body, 2...Partition wall, 3...Cut wheel, 8...Sludge removal pipe, 9...Fixed tooth, 10
...Movable tooth, 11...Drive device, 11a...Rod, 13...Casing, 13a...Casing side wall, 19...Protrusion of casing side wall, 20,
31... Vibration absorber, 22, 27, 33, 35... Vibration absorber mounting bolt, 23... Seal case, 23a
... Greasing groove, 24, 24' ... Seal, 28, 3
7...Flexible body, C...Crushing device.

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 to crush the cruciate in the excavated soil and discharge it to the mud drainage pipe, in which a plurality of stages are in sliding contact with the outer periphery of the rod. Between a seal case that holds a seal and has a greasing groove between the seals and the casing side wall or its overhang, one end is in close contact with the seal case and the other end is in close contact with the casing side wall or its overhang. A mud water pressurizing type, characterized in that a vibration absorber that is attached to the rod and deforms following the vertical swing of the rod is interposed, and a portion of the vibration absorber facing the face side is covered with a flexible body that can be expanded and contracted. A crushing device in a shield tunneling machine.