JP2605174Y2 - Screw conveyor joint device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw conveyor joint device provided in a leading pipe of a small-diameter pipe propulsion machine for burying a small-diameter pipe in the ground.

[0002]

2. Description of the Related Art Conventionally, in a small-diameter pipe propulsion machine in which a small-diameter pipe having a front pipe attached to a tip portion is propelled into the ground and buried, in order to bury the small-diameter pipe accurately along a plan line, As shown in FIG. 1, a pilot head c that is swingable by a swing mechanism b is provided at a tip end of a leading conduit a,
The direction of propulsion can be corrected by the pilot head c.

[0003] A cutter head d is provided in front of the pilot head c. The earth and sand excavated by the cutter head d is taken into the front pipe a, and then the small diameter pipe f is moved by the screw conveyor e. The cutter head d is attached to the screw shaft g of the screw conveyor e, and the cutter head d is rotated via the screw shaft g. I have. Therefore, a joint h is provided on the screw shaft g so as to be bent when the pilot head c is rocked by the rocking mechanism b.

[0004]

The joint h provided on the screw shaft g has a multi-functionality such as transmission of the co-rotating torque to the cutter head d, and conveyance of earth and sand, rocking and conveyance of excavated additive. On the other hand, because it is used without lubrication,
Especially in the case of construction where the direction correction is frequently performed, the joint part wears out early and the running cost is high, and if it is worn out, the construction must be interrupted and replaced,
There were problems such as extension of the construction period. The present invention has been made for the purpose of improving the above-mentioned problems, and an object of the invention is to provide a screw conveyor joint device having improved durability.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a swing mechanism mounted on the tip of a small-diameter pipe to be buried and propelled into the ground. A pilot head is provided which can be swung, and a cutter head which is rotated through a screw shaft of a screw conveyor is provided at the front of the pilot head, and the earth and sand excavated by the cutter head is conveyed by the screw conveyor. In the screw conveyor joint device of the small-diameter pipe propulsion machine described above, the screw shaft of the screw conveyor positioned at the pivot center of the pilot head is provided with a joint screw having a joint main body that allows bending of the screw shaft and a screw blade. At the same time, the joint part of the joint body, screw shaft and joy It is obtained by encapsulating a lubricant between the inner surface of Tosukuryuu.

Since the lubricant is sealed between the fitting portion of the joint body provided at the pivot center of the pilot head and the screw shaft and the inner surface of the joint screw according to the above configuration, it has been used in a conventional oil-free state. The durability is remarkably improved compared to the joint. As a result, even when the direction is frequently corrected, the number of times that the joints need to be replaced can be reduced, so that the running cost can be reduced and the work is not interrupted due to the replacement of the joints. It can also be shortened.
In addition, since screw blades are provided on the outer periphery of the screw shaft and joint screw, almost all screw conveyors have screw blades,
Excavated earth and sand can be transported reliably to the rear.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described in detail with reference to the drawings shown in FIGS. FIG. 1 is a cross-sectional view of a leading pipe attached to the tip of a small-diameter pipe to be buried and propelled into the ground, FIG. 3 is an enlarged cross-sectional view of a joint device, and FIG. 4 is a cross-section taken along line AA of FIG. FIG. 5 and FIG. 5 are exploded perspective views of the same. In these figures, reference numeral 1 denotes a leading pipe attached to the tip of a small-diameter pipe 2, and a pilot head 4 is connected to the tip via a spherical joint 3. The pilot head 4 is swingable around a spherical joint 3 by a swing mechanism 5 including a plurality of direction correcting cylinders 5a. A cutter head 6 is provided at the front of the pilot head 4 via a bearing 7. It is rotatably supported.

The cutter head 6 is connected to the tip of a screw shaft 8b of a screw conveyor 8 provided in the leading pipe 1 and the small-diameter pipe 2, and is rotated via the screw shaft 8b. A disk cutter 9 for excavating a face in front of the front pipe 1 with rotation is provided on the front surface. The earth and sand excavated by the cutter head 6 is taken into the casing 8a of the screw conveyor 8 provided in the front pipe 1, and then conveyed backward through the casing 8a by the screw shaft 8b. .

On the other hand, the screw shaft 8b located at the pivot center of the pilot head 4 is provided with a joint body 10 that allows the screw shaft 8b to be bent. As shown in FIG. 3 and subsequent figures, the joint body 10 has a polygonal fitting portion 10a formed at both ends thereof.
One is a screw shaft 8 connected to the cutter head 6.
b, and are joined by the fixing tool 12 so as not to come off.

The other fitting portion is fitted to one end of a short joint screw 10b so as not to be detached by a fixing tool 12, and the other end of the joint screw 10b is connected to a subsequent screw. The fitting portion 8c of the shaft 8b is fitted. Joint screw 1
Screw blades are provided on the outer periphery of Ob as shown in FIG. And each fitting part 10a and screw shaft 8b
A lubricant such as grease is sealed between the joint screw 10b and the inner surface of the joint screw 10b.
0a, the screw shaft 8b and the joint screw 10b are provided with a hexagonal seal 13, and two annular grooves 10b formed in the middle of the joint body 10.
An O-ring 14 is fitted to the fixing member 12, and a seal washer 15 is fitted to the insertion portion of each fixing tool 12. This prevents the sealed lubricant from flowing out, and prevents the earth and sand or muddy water from entering the fitting portion 10a and the screw shaft 8b. And between the joint screw 10b and the inner surface of the joint screw 10b.

Next, the operation will be described. The cutter head 6 provided at the distal end of the front pipe 1 is rotated with the rotation of the screw shaft 8b to excavate the face in front of the front pipe 1 and to excavate the excavated earth and sand. Is conveyed rearward by a screw conveyor 8 in the leading conduit 1. Then, as shown in FIG. 2, the screw shaft 8b and the joint screw 10b
The screw blades are provided on the outer periphery of the screw conveyor, and the screw blades are substantially provided over the entire area of the screw conveyor 8, so that the excavated earth and sand can be reliably transported backward. When the propulsion direction of the tip pipe 1 during propulsion deviates from the planned line, the direction is corrected by oscillating the pilot head 4 by the directional correction cylinder 5a of the oscillating mechanism 5. At this time, the screw shaft 8b is also connected to the joint. Since the main body 10a and the joint screw 10b allow bending as shown in FIG. 3, the direction correcting operation can be performed smoothly, and each fitting portion 10a of the joint main body 10 and the screw shaft 8b
Also, since the sliding portion is lubricated by the lubricant sealed between the inner surfaces of the joint screw 10b, the sliding portion does not wear out early even if the direction is frequently corrected.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a leading pipe of a conventional small-diameter pipe propulsion machine.

FIG. 2 is a sectional view showing a leading pipe of the small-diameter pipe propulsion machine according to one embodiment of the present invention.

FIG. 3 is an enlarged sectional view showing a screw conveyor joint device according to an embodiment of the present invention.

FIG. 4 is a sectional view taken along line AA of FIG.

FIG. 5 is an exploded perspective view of a screw conveyor joint device according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lead pipe 2 Small diameter pipe 4 Pilot head 5 Swing mechanism 6 Cutter head 8 Screw conveyor 8b Screw shaft 10 Joint body 10a Fitting part 10b Joint screw

Continuation of the front page (56) References JP-A-63-176594 (JP, A) Jpn. Microfilm (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A swinging mechanism at the front of a front conduit (1) mounted on the tip of a small-diameter pipe (2) to be buried and propelled into the ground.
A swingable pilot head (4) is provided by (5), and a cutter head (6) rotated via a screw shaft (8b) of a screw conveyor (8) is provided at the front of the pilot head (4). Install and cutter head
The earth and sand excavated by (6) is transferred to the screw conveyor
Small diameter pipe propulsion machinery of the scan which is adapted to convey (8)
In the screw conveyor joint device , the screw shaft (8b) of the screw conveyor (8) located at the swing center of the pilot head (4) is screwed to the screw shaft (8b).
(8b) a joint body (10) that allows bending;
Joint screw with screw blades (10
b) and the fitting portion of the joint body (10)
(10a) , a screw shaft (8b), and a screw conveyor joint device in which a lubricant is sealed between inner surfaces of the joint screw (10b) .