JPH0223677Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a gravel crushing device for a muddy water type shield machine.

The present inventor has constructed a cutter disk with an inlet on the front surface, a drum shaft attached to the cutter disk, and a central opening of a gravel crushing chamber that is integrally fixed with the shield body 1 inside the drum shaft. It has a pressure chamber at the front and a gravel crushing chamber at the rear, which are each equipped with a number of peripheral pores similar to the raking blades separated by a partition wall, and one end is a cutter disk and the other end is a gravel crushing chamber. including a center shaft supported on the rear bulkhead; on the center shaft;
A mud water pressurizing type shield excavator is equipped with a valve body that opens and closes the central opening in which the rotary crusher is integrated, and the mud water is introduced into the pressure chamber by closing the central opening with the valve body. and among the gravel,
A device that drains small particles along with muddy water through peripheral pores, and a valve body that opens a central opening to take large gravel chunks into the gravel crushing chamber, crush them with the rotation of the rotary crusher, and drain the mud. A device for removing mud with a pipe, an outer wall of the crusher through which the crushed gravel passes, a chute to prevent the crushed gravel from accumulating or arching, and a drawer feeder installed at the bottom of the gravel crushing chamber. We have already researched and developed a mud water pressurized shield excavator (Japanese Unexamined Patent Publication No. 1983-30800). In this mud water pressurizing shield excavator, the rotary crusher has a device that allows the integrated valve body to slide on the center shaft, a device that rotates the rotary crusher with a dog clutch, and a device that rotates the rotary crusher and generates electricity on the center shaft. A device that receives a thrust load, a device that incorporates a cylinder device into the tail side end of the center shaft that is integrated with the valve body and rotary crusher to make it slidable, and a device that has gears and rotates the rotary crusher. A technique is disclosed in which each of the following is provided.

However, with the muddy water pressurized shield excavator mentioned above,
There are difficulties in the opening/closing action and rotational movement of the valve body with an integral rotary crusher. In particular, when the rotary crusher rotates, the valve body rotates while in contact with the valve seat at the central opening of the partition (valve closed state). Wear due to sliding wear on the valve seat was unavoidable. In addition, the structure of the operating cylinder that governs the forward and backward movement of the valve body and the mechanism related to the rotary crusher drive device are complex and prone to failure, and in particular, each drive device section extends relatively long backward from the gravel crushing chamber. This structure had drawbacks such as the inner space of the shaft being narrowed, resulting in a poor working environment, and the rotational torque of the rotary crusher being excessive, making it uneconomical and unsuitable for small-diameter shields.

This invention is intended to improve the above-mentioned drawbacks by providing a gravel crushing device for a muddy water type shield machine as described below.

This invention will be explained in detail with reference to the drawings. First, numeral 1 is a muddy water pressurizing shield machine, and numeral 3 is a cutter disk equipped with an inlet 2 on the front. Also 4
is a drum shaft attached to the cutter disk 3, and inside the drum shaft 4,
A front pressure chamber 9 and a rear gravel crushing chamber 10 are defined by a partition wall 5 having a central opening 6 and each have a raking blade 7 and a large number of peripheral pores 8. Next, 12 is a center shaft whose both ends are rotatably installed on the cutter disk 3 and the rear wall 11 of the gravel crushing chamber 10 by bearings 13, respectively. A guide cylinder 14 having a spline groove 14a etc. on its outer periphery is wedged by a key 15. Reference numeral 16 denotes a valve body in which a valve portion 16b extending outward in the shape of a brim is formed at the tip of a cylinder body 16a.
7 are integrally attached eccentrically. The valve body 16 configured as described above has a spline groove 16 on its inner peripheral surface that engages with the spline groove 14a, etc., and can move forward and backward along the guide cylinder 14 and rotate integrally. ing. Also, the valve body 16
The outer periphery of the rotary crusher 17, which is integrally attached to the rotary crusher 17, is made of special steel, and the contact portion with the circumference is tapered, so that the special steel can be replaced if it wears out. Two internal chambers 20 are provided in the cylinder body 16a along the guide cylinder 14, and in both internal chambers 20,
An operation cylinder 21 for driving the valve body 16 forward and backward, having one end pivotally connected to the valve body 16 and the other end pivotally connected to the guide cylinder 14.
are internally connected to the hydraulic unit via a rotary valve 22 at the rear end of the center shaft 12 and an appropriate switching valve. Further, a large gear 23 is fixed to the rear end of the center shaft 12 and meshes with a pinion 25 of a motor 24 located immediately after the gravel crushing chamber 10, thereby forming a rotational drive device A for the center shaft 12. . And again valve body 1
Reference numeral 6 is such that the diameter of the valve portion extending toward the outer periphery in the shape of a brim is such that when the valve body 16 slides forward, it contacts the valve seat provided in the central opening 6 and closes the valve. A bearing mechanism B is incorporated in the valve seat portion, in which a large number of steel balls and cylindrical rollers are interposed between the outer race 18a and the inner race 18b.
This bearing can also be incorporated into the valve body 16. Further, 26 is an outer wall of the crusher having a through hole 27, 28 is a chute, 29 is a drawer feeder, and 30 is a mud drain pipe. In addition, pressure chamber 9 and gravel crushing chamber 1
A pressure regulating valve is provided between the two chambers to prevent a sudden pressure difference from occurring between the two chambers.

In this invention, the gravel remaining in the pressure chamber 9 is
As the cutter disk 3 rotates, it is lifted upward by the scraping blades 7 attached to the cutter disk 3 and falls downward, so that the valve body 16
When the debris is inserted into the pressure chamber 9, the falling gravel is taken into the gravel crushing chamber 10 by the valve body 16. Therefore, the diameter of the valve body 16 influences the size of the opening and determines the diameter of the gravel taken in. After taking the gravel into the crushing chamber 1, the valve body 16 is closed, and the valve body 16 is placed on the center shaft 12 and the guide cylinder 14.
The rotary crusher 17, which is eccentrically attached integrally with the crusher, is rotated, and the gravel is compressed and crushed by rolling between it and the crusher outer wall 26. The crushed gravel passes through the through hole 27 of the crusher outer wall 26 and is collected at the lowest end by the chute 28, and is sent to the mud removal pipe 30 by the drawer feeder 29 to remove mud so as to prevent accumulation and arching.

As mentioned above, this idea is based on the rotating crusher 1.
Since the valve body 16 with which the valve body 7 is integrated is configured so that it can move forward and backward and rotate integrally along the guide tube 14 wedged to the center shaft 12, the opening/closing action of the valve body 16 and the rotation of the crusher are extremely smooth and positive. In particular, since the bearing mechanism B is built into the valve seat portion of the valve body 16, there is no sliding between the valve body 16 and the valve seat when the rotary crusher 17 rotates, thereby reducing wear. It has the excellent effect of allowing extremely smooth rotation.

Further, the rotation drive device A of the center shaft 12 is provided immediately after the gravel crushing chamber 10, and the valve body 16
The operation cylinder 21 for forward and backward drive is the guide cylinder 14
Since it is configured to be installed inside the cylinder body 16a along the line, the operating mechanism related to the operation cylinder 21, which is a direct-acting motor, and the rotary drive device A, which is a rotary motor, is simple and does not cause any failures. At the same time, the underground space does not become narrow, and in particular, since the rotation drive device A of the center shaft 12 is provided immediately after the gravel crushing chamber 10, and the center shaft 12 is relatively short, the torsional moment can be reduced. It is small and does not generate excessive rotational torque, so it is economical in terms of power and durability, and can be used for small-diameter shields. Furthermore, an operating cylinder 21 for driving the valve body 16 forward and backward is installed in the cylinder body 16a along the guide cylinder 14, and the operation cylinder 21 is exposed in the gravel crushing chamber 10 when the valve body 16 moves forward. However, only a part of the main body of the operating cylinder 21 is exposed, and the piston rod part, which is the operating part, is housed in the cylinder body part 16a.Moreover, when the valve body 16 moves forward, the valve body 16 is opened to take the gravel into the gravel crushing chamber 10,
There is an advantage that the operation cylinder 21 hardly ever breaks down.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention: Fig. 1 is a longitudinal sectional side view with the valve body open, Fig. 2 is an enlarged longitudinal sectional side view of the main part with the valve body closed, and Fig. 3 is an enlarged longitudinal sectional side view of the main part with the valve body closed. It is a longitudinal sectional front view same as the above. 1... Mud water pressurized shield machine, 2... Inlet, 3... Cutter disk, 4... Drum shaft, 5... Partition wall, 6... Center opening, 7... Scraping blade, 8... ...Peripheral pore, 9...Pressure chamber, 10...
... Gravel crushing chamber, 11 ... Rear side wall, 12 ... Center shaft, 13 ... Bearing, 14 ... Guide tube, 1
4a... Spline groove, 15... Key, 16...
Valve body, 16'... Spline groove, 16a... Cylinder body, 16b... Valve portion, 17... Rotating crusher, 18a... Outer race, 18b... Inner race,
19...Steel ball, 20...Inner chamber, 21...Operation cylinder, 22...Rotary valve, 23...
Large gear, 24...motor, 25...pinion,
26... Crusher outer wall, 27... Through hole, 28
...Shoot, 29...Drawer feeder, 30...
...Sludge removal pipe, A...Rotary drive device, B...Bearing.

Claims (1)

[Scope of utility model registration request] Both ends are connected to a cutter disk 3 and a gravel crushing chamber 10
A center shaft 12 rotatably installed on the rear wall 11, a guide cylinder 14 fitted into the center shaft 12 in the gravel crushing chamber 10, and wedged.
A rotary crusher 17 is integrally and eccentrically attached to the cylinder body 16a of the valve body 16, which can move forward and backward along the guide cylinder 14 and rotate together with the guide cylinder 14, and the front side of the gravel crushing chamber 10, which the valve body 16 opens and closes. A bearing mechanism B interposed in the valve seat of the central opening 6, a rotational drive device A for the center shaft 12 provided immediately after the gravel crushing chamber 10, and the inside of the cylinder body 16a along the guide cylinder 14. A gravel crushing device for a muddy water type shield machine, characterized by comprising an operating cylinder 21 for driving a valve body 16 times forward and backward, and a valve body equipped with the valve body.