JPH0626632Y2 - Clutch device for cutter head of small diameter pipe propulsion machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a cutter device for a cutter head of a small diameter pipe propulsion machine for burying a small diameter in the ground.

[Conventional technology]

Conventionally, in a small-diameter pipe propulsion machine for burying a small-diameter pipe such as a sewer pipe or a gas pipe into the ground without digging, a pilot head that is attached to the tip of the small-diameter pipe to be buried and propelled into the ground A cutter head that is rotated via a screw shaft is provided at the tip of the, and the cutter head excavates the ground.

In addition, the earth and sand excavated by the cutter head are taken into the pilot bed, then carried out backwards in the small-diameter pipe by the screw conveyor, and discharged to the ground from the starting shaft.

[Problems to be solved by the device]

In the conventional small-diameter pipe propulsion machine as described above, when excavating a gravel layer, most of the driving force is consumed by the gravel taken into the screw conveyor, and the cutter head cannot rotate, so-called stall often occurs. .

Therefore, in the past, when a stall occurred, the screw conveyor was reversed to release the stall state.
Since the screw shaft of the screw conveyor and the cutter head are connected to each other, when the screw shaft is reversed, the cutter head also reverses and disturbs the ground, and the collapsed earth and sand accumulate on the lower front part of the cutter head.

As a result, during the next propulsion, the cutter head climbed onto this soil and the pilot head climbed upward, causing the propulsion direction to deviate from the planned line.

The present invention has been made for the purpose of improving the above problems, and an object of the present invention is to provide a cutter head clutch device for a small-diameter pipe propulsion machine that can transmit power to the cutter head only when necessary.

[Means and Actions for Solving the Problems]

In order to remedy the above-mentioned problems, this invention is connected to the screw shaft of a screw conveyor for soil discharge at the tip of a pilot head that is attached to the tip of a small diameter pipe to be buried and propelled into the ground. In a small-diameter pipe propulsion machine equipped with a cutter head that is rotated together with the cutter head, the clutch body that turns on and off the transmission of power to the cutter head is provided on the cutter head side of the screw shaft.
If stall etc. occurs due to biting of gravel,
A clutch device for a cutter head of a small diameter pipe propulsion machine, which can release the stall state without disturbing the ground by the cutter head by turning off the clutch body and rotating only the screw shaft. is there.

〔Example〕

 An embodiment of the present invention will be described in detail with reference to the drawings.

In the figure, 1 is a pilot head mounted on the tip of a small diameter pipe to be buried and propelled into the ground. It is divided into two parts, front and rear, and front and rear head members 1a and 1b are connected via a ball joint 2. Thus, the front member 1a can rotate with respect to the rear member 1b about the ball joint 2.

A cutter head 4 is rotatably provided at the tip of the front member 1a via a bearing 3.

A disk cutter 5 is rotatably supported on the front surface of the cutter head 4, and the ground in front of the cutter head 4 is excavated as the cutter head 4 rotates. Gravel and earth and sand are taken into the cutter head 4 through the earth and sand intake port 4a and then conveyed backward through the small diameter pipe by the screw conveyor 6 provided in the pilot head 1.

On the other hand, the screw conveyor 6 has a screw shaft 6a which penetrates through the ball joint 2 and projects into the cutter head 4. The center of the cutter bed 4 is connected to the tip of the screw shaft 6a. In addition, the cutter head 4 is rotated with the rotation of the screw shaft 6a.

The main body 8 of the clutch device of the present invention is provided on the tip side of the screw shaft 6a.

The clutch body 8 is a screw shaft divided into two parts, front and rear.
Has one of the shaft member ₆₁ cylindrical sleeve 8a, one end of which is pressed into the 6a, the other end of the sleeve 8a is inserted slidably in the other shaft member 6 in the ₂ There is.

The outer periphery of the sleeve 8a be formed an annular groove 8e, the O-ring 9, which is housed in the annular groove 8e shaft member 6 ₂
Inner By pressed against the peripheral surface, the shaft member 6 ₂ and sleeve
Liquid tightness between 8a is maintained and each shaft member 6 ₁ , 6 ₂
As shown in FIGS. 2 and 3, concave portions 8b and convex portions 8c formed by, for example, dividing into four in the circumferential direction are provided at the ends facing each other.

The recess 8b and the convex portion 8c is adapted to mate as shown in FIG. 4, respectively and the convex portion 8c and recess 8b formed in the other shaft member 6 ₁ or 6 _2, screw shaft in this state 6 The rotation can be transmitted to the cutter head 4.

In addition, the blades protruding in a spiral shape on the outer peripheral surface of the screw shaft 6a
6b, each shaft member ₆₁ and 62 to the outer peripheral surface of the _two has been projected as shown in FIG. 1, the blade 6b of the shaft member 6 ₂ side pitch is small.

Next, the operation will be described. The pilot head 1 is attached to the tip of a small-diameter pipe propelled into the ground by a propulsion device installed in a starting shaft (not shown), and the propulsion direction is controlled and the cutter head 4 controls the ground level. The earth is excavated while excavating. The earth and sand excavated by the cutter head 4 which is rotated together with the rotation of the screw shaft 6a is taken into the cutter head 4 and then moved backward in the small diameter pipe by the screw conveyor 6. Be delivered to.

On the other hand, when excavating in a gravel layer, the screw conveyor 6
The stall is generated by the gravel taken in, and in order to cancel the stall, when the screw shaft 6a is reversed, the screw shaft 6a is retracted by the propulsion device. As a result, the engagement between the recesses 8b, 8c of the clutch body 8 is disengaged as shown in FIG. 5, and in this state, the screw shaft 6a can be reversed to release the stall.
Since the clutch body 8 does not transmit the rotation of the cutter head 4 side to the cutter head 4 side, even if the screw shaft 6a is reversed,
Will not disturb the ground.

When the stall is released, the screw shaft 6a is moved forward again, the recesses 8b and the protrusions 8c of the clutch body 8 are engaged with each other, and the cutter head 4 is rotated together with the screw shaft 6a, so that the excavation can be resumed.

[Effect of device]

As described in detail above, this invention has a clutch body for turning on and off the transmission of power to the cutter head on the cutter head side of the screw shaft that drives the cutter head. Even if a stall occurs due to the gravel taken in, the screw shaft can be reversed by rotating the clutch body without rotating the cutter head.

As a result, the stall can be released without disturbing the ground by the cutter head, and it is possible to eliminate problems such as the cutter head climbing up onto the collapsed earth and sand, and the propulsion direction deviating from the planned line.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is a sectional view of a pilot head, FIG. 2 is a perspective view of a clutch body formed on one shaft member, FIG. 3 is a front view of the same, and FIG. Is a sectional view of the clutch on state, and FIG. 5 is a sectional view of the clutch off state. 1 ... Pilot head, 4 ... Cutter head, 6 ... Screw conveyor, 6a ... Screw shaft, 6 ₁ , 6 ₂ ... Shaft member, 8 ... Clutch body, 8b ... Recessed portion, 8c ... Convex portion.

Claims (3)

[Scope of utility model registration request] 1. A screw shaft 6a of a soil discharging screw conveyor 6 is connected to the tip of a pilot head 1a that is mounted on the tip of a small diameter pipe to be buried and propelled into the ground, and rotates together with the screw shaft 6a. In a small-diameter pipe propulsion machine provided with a cutter head 4, a small-diameter pipe propulsion machine is provided with a clutch main body 8 for turning on and off transmission of power to the cutter head 4 on the cutter head 4 side of the screw shaft 6a. Clutch device for machine cutter head. 2. The clutch body 8 is constructed by providing a concave portion 8b and a convex portion 8c which mesh with each other at a connecting portion of shaft members 6 ₁ and 6 ₂ formed by dividing a screw shaft 6a. The cutter device for a cutter head according to Item 1. 3. The clutch body 8 by moving the screw shaft 6a back and forth by a propulsion device installed on the side of the starting shaft.
The cutter device for a cutter head according to claim 1, wherein the clutch device is turned on and off.