JPH0338319Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a gravel crushing device, and more particularly to a gravel crushing device for an excavation rig having a rotary earth removal means.

[Prior art and its problems]

Conventionally, excavation equipment that uses rotary earth removal means, such as screw-type pipe burying equipment and shield-type excavators, is equipped with a gravel crusher that crushes the gravel that is taken in with the earth and sand during excavation. be.

In a conventional gravel crushing device, as schematically shown in FIG. 5, an eccentric crushing member 3 is fixed to a central axis 2 of a tip tube member 1 such as a cylindrical cutting edge tube or a leading tube. The gravel 5 is crushed between the bits 4, 4, .

However, according to the lever device, when the eccentric crushing member 3 rotates eccentrically in the direction of the arrow, the gap between the inner peripheral surface of the tip tube member 1 and the outer peripheral surface of the eccentric crushing member 3 gradually narrows. The gravel 5 is ground and crushed. Therefore, between the eccentric crushing member 3 and the gravel 5, the inner peripheral surface of the tip tube member 1 and the gravel 5
As a result, it is necessary to overcome these frictional forces and rotate the eccentric crushing member 3. Therefore, the required torque is large, and a drive mechanism to rotate the eccentric crushing member 3 is required. Therefore, the crushing efficiency is low and the bit 4 provided in the eccentric crushing member 3 is
It had disadvantages such as rapid wear and easy wear and tear.

[Purpose of invention]

The present invention was developed with the aim of eliminating the drawbacks of the above-mentioned conventional technology.It eliminates the occurrence of friction during gravel crushing, reduces the torque required for gravel crushing, and reduces bit wear. An object of the present invention is to provide a gravel crushing device capable of efficiently crushing gravel.

[Summary of the idea]

In order to achieve the above object, the gravel crushing device according to the present invention is an excavating device having a rotary earth removal means, and the center axis of the gravel crushing device is located at the center of the tip tube member of the excavating device so as to be freely rotatable. The structure is characterized in that an eccentric cylindrical body is fixed eccentrically to the crushing cylinder, and a gravel crushing cylindrical body is rotatably supported on the outer periphery of the eccentric cylindrical body.

[Example of idea]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4, using the same reference numerals for parts common to those in FIG. 5.

The illustrated embodiment shows a case in which the present invention is applied to an excavation device that transports earth and sand backward by a screw 6 and discharges the earth, excavates a horizontal hole in the ground, and buries a pipe. 7 indicates a leading tube provided at the tip of the casing 8. A cutting edge tube 9 is connected to the tip of the leading tube 7 via a sealing member 10 so as to be able to swing at a predetermined angle, and a cutting edge is connected between the connecting ends. Method correction cylinder 1 for correcting the direction of the mouth pipe 9
1 and 11 are connected.

An excavation head 12 is fixed to the tip of the screw shaft 2 serving as a central shaft at a position slightly protruding from the front end of the cutting edge tube 9. This drilling head 12
is the screw shaft 2, as shown from the front in Figure 2.
A plurality of (three in the figure) arms 14, 14, 14 are provided protruding in the radial direction from a base 13 fixed to the base 13,
A ring 1 is attached to the tips of these arms 14, 14, 14.
5 is fixed to the base 13, arms 14, 1
Bits 16 are provided on the outer surfaces of each of the rings 4, 14, and ring 15 in a protruding manner. Moreover, a blade 17 is provided inside one arm 14 to transport earth, sand, and gravel that enter between the arms 14, 14 to the rear.

Screw shaft 2 inward from the excavation head 12
An eccentric cylindrical body 18 eccentric to the axis of the screw shaft 2 is fixed to the cylindrical body 18, and a gravel crushing cylindrical body 1 having a hoop-shaped outer peripheral surface is attached to the outer periphery of the eccentric cylindrical body 18.
9 is rotatably fitted on the outside via bearings 20, 20, and a large number of bits 2 are mounted on the outer peripheral surface of this cylindrical body 19.
1, 21... are provided protrudingly. In addition, 22, 22
are fixed to both ends of the eccentric cylindrical body 18, and the bearings 20,
20 and a presser plate that supports the gravel crushing cylindrical body 19. Further, the holding plates 22, 22 have bearings 2
Sealing materials 24, 24 are provided between the eccentric cylindrical body 18 and the eccentric cylindrical body 18 in order to prevent earth and sand from entering the interior of the cylinders 0, 20.

The rear inner circumferential surface 9A of the cutting edge tube 9, which faces the rear half of the outer circumferential surface of the gravel crushing cylinder 19, is such that the outer circumferential surface of the gravel crushing cylinder 19 and the inner circumferential surface of the cutting edge tube 9 become closer toward the rear. It has a tapered shape so that the gap gradually narrows, and the minimum diameter portion at the rear end approximately matches the inner diameter of the casing 8.

The tip 23A of the screw blade 23 wound spirally on the screw shaft 2 is located on the short diameter side of the eccentric cylinder 18, and is located between the gravel crushing cylinder 19 and the rear inner circumferential surface of the cutting edge tube 9. extended to fit into the
The gravel 5 located within the wide gap on the short diameter side is moved into the casing 8.

Note that the bits 21 on the outer peripheral surface of the cylindrical body 19,
21... may be made into a hard build-up part by build-up welding, etc., and the bits 21, 21... or this hard build-up part may be arranged in a spiral shape to have a structure that has the effect of transporting gravel backwards. You can also do it.

Next, the operation of the above embodiment will be explained.

When excavating underground, when the screw shaft 2 is rotated in the direction of the arrow in FIG. 4, the excavation head 12 at the tip of the screw shaft 2 and the eccentric cylinder 1
8 rotate together.

The ground is excavated by the bit 16 of the excavation head 12, and the excavated earth and sand enters the cutting pipe 9 from between the arms 14, 14, 14, is scooped up by the blades 17, and is directed toward the outer circumference of the gravel crushing cylinder 19. Sent. The gravel 5 contained in the excavated earth and sand enters the part where the distance between the outer peripheral surface of the gravel crushing cylinder 19 and the inner peripheral surface of the cutting pipe 9 is wide. Next, as the long diameter side of the eccentric cylinder 19 rotating relative to the screw shaft 2 rotates toward the gravel 5 side, the gravel crushing cylinder 19 rotates on the eccentric cylinder 18 without rotating relative to the gravel 5, and the eccentric cylinder 18 As it moves toward the longer diameter side, the outer peripheral surface of the gravel crushing cylindrical body 19 presses the gravel 5 against the inner peripheral surface of the cutting edge tube 9, and this pressing force leads the gravel 5 to crush.

Therefore, no friction occurs between the gravel crushing cylindrical body 19 and the gravel 5, and between the gravel 5 and the cutting edge tube 9, and there is no loss due to friction.

[Effect of idea]

As explained above, the gravel crushing device according to the present invention is used in an excavation device having a rotational earth removal means, and is provided with a central shaft that is rotatably disposed at the center of the tip tube member of the excavation device. Since the eccentric cylindrical body is fixed eccentrically and the gravel crushing cylinder is rotatably supported on the outer periphery of the eccentric cylinder, the bits of the gravel crushing cylinder come into contact with the gravel during gravel crushing, and frictional force is generated. When this occurs, the gravel crushing cylinder rotates the outer periphery of the eccentric cylinder on the central axis in a direction opposite to the direction of rotation of the central axis, thereby eliminating the frictional force and crushing the gravel by crushing. This makes it possible to eliminate local wear of the gravel crushing cylindrical body and to reduce the torque required to rotate the central shaft. Furthermore, since the eccentric cylinder and the gravel crushing cylinder can rotate relative to each other, and the positional relationship between the two is not fixed, the bits of the gravel crushing cylinder will wear out on average, greatly reducing its useful life. can be extended to

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main parts showing an embodiment of the present invention applied to a screw-type excavation device, Fig. 2 is a front view of the same, Fig. 3 is a sectional view taken along the line of Fig. 1, and Fig. 4 is an explanatory diagram of the same operation, and FIG. 5 is an explanatory diagram of the operation of the prior art. DESCRIPTION OF SYMBOLS 1... Tip tube member, 2... Center shaft, (screw shaft), 5... Gravel, 6... Screw, 7... Leading pipe, 8... Casing, 9... Edge tube, 11...
...Direction correction cinder, 12...Drilling head, 13...
...Base, 14...Arm, 15...Ring, 17
...Blade, 18...Eccentric cylindrical body, 19...Gravel crushing cylindrical body, 23...Screw blade, 23A...Tip portion.

Claims (1)

[Scope of utility model registration request] In an excavation device having earth removal means by rotation, an eccentric cylindrical body is fixed to a central shaft that is rotatably disposed at the center of a tip pipe member of the excavation device, eccentric to the axis, and this eccentric cylindrical body A gravel crushing device comprising a gravel crushing cylinder rotatably fitted and supported on the outer periphery of the gravel crushing cylinder having a bit on the circumferential surface.