JPH0414556Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a device for forcibly discharging excavated soil containing gravel from a chute to the crusher side in a muddy shield excavator.

(Prior art and its problems) The mud shield method fills the mud chamber formed between the back of the cutter plate and the bulkhead of the shield machine with pressurized mud water, stabilizes the face using the mud water pressure, and transports it. Mud water is circulated between the treatment equipment grounded on the ground and the mud chamber of the shield machine through a mud drain pipe, and the mud is used to discharge excavated earth and sand in the mud chamber to the outside of the mine through the mud drain pipe. When excavating gravel ground, as shown in Figure 7, a crusher b is installed on the back of the partition wall a to crush the gravel into small pieces, and then the gravel is discharged through a drainage pipe. As a means for feeding excavated earth and sand into the crusher b, a chute c, which is inclined toward the entrance of the crusher, is fixed to the partition wall in the muddy water chamber.

At this time, if the shield machine has a small diameter, it is not possible to create a steep slope on the chute c, so muddy water is injected from the upwardly inclined end of the chute c toward the crusher b, and the gravel is thrown onto the crusher b. I'm trying to force myself to lead.

However, the ground to be excavated is not necessarily gravel ground, and in some cases, clayey soil appears during the excavation process.
When taken into the drum, it adheres to the inner peripheral surface of the drum,
Even if the clay soil is lifted to the upper part of the chute C by the raking plate e, it becomes unable to fall due to its own weight, and not only does the cut in the excavated soil become insufficient, but it also becomes impossible to excavate. It may happen.

The present invention provides an excavating earth and sand discharge device for a muddy shield machine that solves these problems.

(Means for Solving the Problems) In order to achieve the above object, the excavating earth and sand discharge device in the muddy shield machine of the present invention has a partition wall 4 of the shield machine 1, as shown in the drawing corresponding to the embodiment. A crusher 10 is disposed on the rear surface, and a hollow shaft cylinder 5 that rotatably supports the cutter drum 3 is protruded from the front surface. A muddy water injection nozzle 7 opened toward the inner circumferential surface of the cutter drum 3 is provided at the lower end, and a soil discharge chute is provided in the hollow shaft cylinder 5 and slopes from the soil receiving port 6 to the partition wall 4 and communicates with the crusher 10. 8, partition walls 13, 13 are provided on both side edges of this chute 8, and the space between these partition walls 13, 13 and the inner peripheral surface of the hollow shaft cylinder 5 is formed into muddy water passages 15, 16; This is characterized in that one passage 16 communicates with the upper surface of the upwardly inclined end of the chute 8, and the other passage 15 communicates with the muddy water injection nozzle 7.

(Function) The shield machine is made compact by using the hollow shaft cylinder 5 to serve both as a discharge of earth and sand and as a rotary bearing for the cutter.

During earth and sand excavation, the earth and sand taken into the cutter drum and thrown into the earth and sand receiving port 6 of the hollow shaft cylinder 5 are transported over the chute to the crusher 10 on the rear side of the bulkhead by muddy water spouted from the upwardly inclined end side of the chute 8. After the gravel in the earth and sand is fed and crushed by the crusher 10, it is introduced into the mud removal pipe.

In addition, the sticky soil adhering to the inner surface of the cutter drum 3 and the scraping plate 34 is washed away with muddy water jetted from a muddy water jetting nozzle 7 provided at the lower front end of the hollow shaft cylinder 5.

(Example) To explain the example of the present invention with reference to the drawings, 1
is a shield machine, and a body 3a of a cutter drum 3 having a cutter blade on the front side is rotatably supported on the inner peripheral surface of the front end opening of the skin plate 2, and a skin is provided adjacent to the rear end of the body 3a. A partition wall 4 is fixed to the inner peripheral surface of the plate 2.

Reference numeral 5 denotes a cylindrical hollow shaft cylinder which is arranged at the front central part of the partition wall 4 and whose rear end is fixed to the inner peripheral edge of the partition wall 4;
The body 3a of the cutter drum 3 is located at the center of its outer peripheral surface.
The hollow shaft cylinder 5 is rotatably supported at its small diameter rear end and protrudes into the body 3a of the cutter drum 3.
The front upper periphery of the cutter drum 3 is opened to form a dirt receiving port 6, and a muddy water injection nozzle 7 is provided on the lower peripheral wall surface of the tip of the hollow shaft cylinder 5 and is opened toward the inside of the body of the cutter drum 3.

Reference numeral 8 designates a soil discharge chute extending from the front end of the hollow shaft tube 5 to the lower end of the opening 9 penetrated through the partition wall 4, and its front end is fixed to the upper part of the front end wall plate 5a of the hollow shaft tube 5. The upper surface of the front part faces the lower part of the earth and sand receiving port 6 and is inclined downwardly toward the rear, and the downwardly inclined end is connected to the crusher chamber 11
It communicates with a mud removal pipe 12 connected to the lower end of the sludge pipe 12.

Reference numerals 13 and 13 denote vertical partition plates closely fixed to both end surfaces of the chute 8, whose lower ends are closely fixed to the inner bottom surface of the hollow shaft cylinder 5, and whose height is equal to the height of the front end of the chute 8 and the opening 9. Further, the rear ends are fixed to both end surfaces of the opening 9.

Reference numerals 14 and 14 denote swash plates whose lower ends are integrally connected to the upper ends of the vertical partition plates 13 and 13, and the front portions of the upper ends are integrally fixed to both side edges of the earth and sand receiving port 6 and formed into a hopper shape. The rear end of the upper end is fixed to the inner surface of both sides of the upper peripheral part of the hollow shaft cylinder 5, and the rear end is provided at a position a short distance from the partition wall 4. 15 and 16 are these vertical partition plates 13 and 13
and a hollow shaft cylinder 5 partitioned by swash plates 14, 14.
This is a muddy water passage formed by the spaces on both sides of the tank.

Further, a closing plate 17 is provided on the rear end surface of the swash plates 14, 14.
are fixed together, and the upper peripheral surface of the closing plate is closely fixed to the inner surface of the upper peripheral part of the hollow shaft cylinder 5, and furthermore, the space between the lower surface of the rear end of the swash plates 14, 14 and the partition wall 4 is fixed. A cover plate 18 is disposed in the space on the side of the chute 8, and the lower ends of the cover plate 18 are fixed to the upper ends of the vertical partition plates 13, 13, and the front and rear end surfaces of the cover plate 18 are fixed to the upper ends of the vertical partition plates 13, 13, respectively. The upper surface of the closing plate 17 and the cover plate 18 and the partition wall 4 are brought into close contact with the lower edge and the partition wall 4.
A space within the hollow shaft cylinder 5 surrounded by is formed into an intermediate chamber 19 that communicates with the muddy water passages 15 and 16.

20 is a junction box attached to the rear upper part of the bulkhead 4;
Its front end opening communicates with the intermediate chamber 19 through a through hole 21 provided in the partition wall 4, and the intermediate chamber 19 and the inside of the junction box 20 are communicated with the passages 15 and 16 through a dividing plate 22. Divided chambers 23, 24
These divided chambers 23 and 24 are connected and communicated with branch pipes 27 and 28 having valves 25 and 26, respectively, and these branch pipes 27 and 28
is connected to the mud feeding pipe 29.

Reference numeral 30 denotes a guide plate whose front end is fixed to the upper end of the front end wall plate 5a of the hollow shaft cylinder 5 and whose both ends are fixed to the front parts of the swash plates 14, 14, and which extends rearward along the front upper surface of the chute 8. It used to be sloped downward,
A muddy water outflow opening 31 is formed between the rear end and the front upper surface of the chute 8.

Reference numeral 32 denotes a communication hole opened in the swash plate 14 at the front end of one of the muddy water passages 15, and communicates with the space between the chute 8 and the guide plate 30.

A connecting pipe 33 is connected to the front end of the other muddy water passage 15, and is connected to the muddy water injection nozzle 7.

Reference numeral 34 designates an earth and sand scooping plate that projects from the inner circumferential surface of the body of the cutter drum 3.

A motor 35 is installed at the lower part of the rear side of the partition wall 4, and rotates the cutter drum 3 by meshing a small gear 36 fixed to its rotating shaft with a gear 37 fixed to the rear end of the body of the cutter drum 3.

Reference numeral 38 denotes a cylindrical body fixed to the rear surface of the partition wall 4, into which the front end of the crusher chamber 11 is fitted, and a seal 39 is provided on its inner peripheral surface.

To describe the operation of the embodiment configured as above, the earth and sand including gravel excavated by driving the motor 35 and rotating the cutter drum 3,
The soil is scraped upward by the scraping plate 34 and thrown into the earth and sand receiving port 6 of the hollow shaft cylinder 5, and falls from the guide plate 30 onto the chute 8.

On the other hand, by opening one valve 26 from the mud feeding pipe 29, muddy water is forced to pass through the branch pipe 28 to the divided chamber 24 and the muddy water passage 16, and flows out from the communication hole 32 through the muddy water outflow opening 31 onto the chute 8. As a result, the mud on the chute 8 is moved from the opening 9 of the partition wall 4 to the crusher chamber 11 by the muddy water.
The flow of muddy water into the mud drainage pipe 12
Large-diameter gravel is crushed by a crusher 10 and then discharged to a mud drain pipe 12 by the flow of muddy water.

Next, when cohesive soil is excavated, when both valves 25 and 26 are opened, muddy water flows from the mud feeding pipe 29 through the divided chambers 23 and 24 into the muddy water passages 15 and 16 on both sides inside the hollow shaft cylinder 5. As described above, the mud on the chute 8 is discharged by the muddy water that is pumped and flows through one passage 16, but the muddy water that flows through the other passage 15 is sent from the injection nozzle 7 to the inner surface of the body of the cutter drum 3. The water is ejected towards the ground, washes the scraping plate 34 and the inner surface of the body of the cutter drum 3, and prevents sticky soil from adhering to it.

In the case of clayey soil, it is sometimes desirable to spout muddy water onto the chute 8 by alternately opening and closing the valves 25 and 26, and to spout it from the spout nozzle 7 intermittently. .

(Effects of the invention) As described above, according to the excavating earth and sand discharge device of the muddy shield machine of the present invention, the hollow shaft cylinder 5 protruding from the front surface of the partition wall 4 serves both as a bearing for the cutter drum 3 and as an earth and sand discharge passage. At the same time, the hollow interior is used to provide a muddy water supply path, so the overall structure of the shield machine becomes compact, making it ideal as a small-diameter shield machine, and the muddy water supply path is made into two systems. One side is jetted onto the chute 8 which is the earth and sand discharge passage, and the other side is jetted toward the inner circumferential surface of the cutter drum 3.
Even if the slope of the chute 8 is gentle, the earth and sand can be effectively discharged to the crusher side, and the cutter drum 3
The muddy water sprayed toward the inner circumferential surface of the cutter drum 3 prevents sticky soil from adhering to the inside of the cutter drum 3, and the excavated soil is smoothly taken in, allowing efficient excavation.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a longitudinal sectional side view thereof, FIG. 2 is a cross sectional view taken along line A-A in FIG. B
FIG. 7 is a simplified vertical cross-sectional view of the conventional example. 1... Shield machine, 3... Cutter drum, 4
... Bulkhead, 5 ... Hollow shaft cylinder, 6 ... Sediment intake port,
7...Mud water injection nozzle, 8...Sediment discharge chute, 10...Crashier, 13, 13...Vertical partition plate, 15, 16...Mud water passage, 31...Mud water outflow opening, 34...Skeeping board .

Claims (1)

[Scope of utility model registration request] A crusher 10 is attached to the rear of the bulkhead 4 of the shield machine 1.
At the same time, a hollow shaft cylinder 5 that rotatably supports the cutter drum 3 is protruded from the front surface, and an earth and sand reception opening is provided at the front upper circumference of the hollow shaft cylinder 5, and the inner part of the cutter drum 3 is provided at the lower front end. A muddy water injection nozzle 7 opened toward the circumferential surface is provided, and a hollow shaft cylinder 5 is provided.
An earth and sand discharge chute 8 is provided inside the earth and sand intake port 6 to the partition wall 4 and communicates with the crusher 10, and partition walls 13, 13 are provided on both side edges of this chute 8, and these partition walls 13, 13 and the inner circumferential surface of the hollow shaft cylinder 5 as a muddy water passage 15,
16, one passage 16 is connected to the upper surface side of the upwardly inclined end of the chute 8, and the other passage 15 is connected to the mud water injection nozzle 7. Device.