JPH089954B2 - Excavator with a left-right rotatable transfer paddle screw - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention, when embedding various pipes, such as pipes constituting a cable storage pipe, in the soil by a propulsion method The present invention relates to a tunnel excavator that is used for excavating sediment in front of the traveling direction and discharging the excavated sediment backward.

(Prior Art) Conventionally, in this type of excavator, a belt conveyor or the like was generally used to transfer and discharge the excavated earth and sand backward, but in view of downsizing of the device, a rotary shaft of a cutter is used. A screw conveyor is provided on the outer circumference of the to convey soil and sand backward as the cutter rotates. However, since the earth and sand excavated by the cutter must always be transported backwards, this cutter can only rotate in one direction, and the rotation of such a cutter causes the excavator itself to gradually rotate in the opposite direction to the rotation of the cutter. To go. The rolling of this machine results in adverse effects on machine performance and subsequent rolling of the propulsion tube. Also, in the case of a screw conveyor, the sand and sand are transferred, but there is no stirring function.

Therefore, a large number of paddles that are stirring protrusions are provided on the outer circumference of the rotary shaft of this cutter, and the rearward transfer of earth and sand is carried out by propelling the excavator into the soil from the vertical shaft by a separately-sourced push jack, etc. What is agitated by the paddle of the rotary shaft during the transfer is used. The cutter provided with this paddle can rotate not only in one direction but also in both directions.

(Problems to be solved by the invention) However, in the case where the cutter is provided with a paddle on the rotary shaft, the sand is transferred by the propulsion of the excavator into the soil as described above. It is difficult to adjust the propulsion speed of the thruster, and smooth sediment cannot be transferred. When the pressure inside the excavator becomes low or high as a result, the pressure propagates to the front of the excavator accordingly, and pressure is applied to the ground in front of the excavator, so that unexpected subsidence or uplift of the ground occurs. There is concern about the situation, which is not desirable.

The present invention solves such a problem and provides an excavator capable of smoothly transferring excavated earth and sand and having a stirring effect, having a paddle screw capable of rotating both left and right and adjusting the pressure in the excavator. It is intended for.

(Means for Solving the Problem) In order to solve the problem, the present invention provides a large number of paddles on the outer circumference of a rotary shaft of a cutter member as a sand transporting means, and the width of the cross-sectional both side surfaces of each paddle is from the front. The problem is solved by making the shape narrower toward the rear. Thus, the concrete configuration of the present invention is that a sediment transfer pipe and a sediment chamber are provided in the excavator body, respectively, and a rotary shaft that is rotationally driven by an appropriate drive source is passed through the sediment transfer pipe. A cylinder that has a cutter member at the front end of the shaft and that is constructed by a cylinder that projects from one end of the lower part of the earth and sand chamber and is connectable to the discharge port of the other end of the lower part, and a piston that is slidable in the cylinder. In an excavator having a device, a large number of paddles are provided on the outer circumference of the rotary shaft, and among these, each paddle located in the earth and sand transfer pipe has a space between both side walls forming left and right sides with respect to the rotary shaft direction going backward. The paddles having a narrow cross section according to the above and provided spirally in the longitudinal direction of the rotary shaft, and the paddles located in the sediment chamber are plate-shaped, and the upper portion of the sediment chamber is extended by the protrusion and extension of the cylinder. Contracted direction, and extends in the lower direction of the sediment chamber with the housing of the cylinder, a jack for changing the sediment chamber volume, but on the above sediment chamber top.

(Operation) When this rotary shaft is driven to rotate by an appropriate drive source, the cutter member rotates and cuts the ground in front, and the earth and sand generated by this are agitated by the multiple paddles of the rotary shaft in the earth and sand transfer pipe. To be done. Also, the earth and sand hitting the side wall of each paddle is inclined so that the side wall of the paddle becomes narrower as it goes backward, and is further provided spirally in the longitudinal direction of the rotating shaft, so it is pushed backward by the rotation of the paddle. I can do it. Then, the earth and sand hit the side wall of the next paddle located behind the paddle and are pushed further rearward. Further, in the earth and sand chamber, since the paddle provided at the location is plate-shaped, the earth and sand are not transported and only stirring is performed. In this way, the paddle screw consisting of the paddle and the rotating shaft of the present invention serves to stir and convey the earth and sand. Then, the sediment is transported to the sand chamber. And, even if the cylinder connected to the sand chamber passes through the sand chamber and is connected to the discharge port, and the excavated sand fills the sand chamber and raises the pressure, the jack operates in conjunction with the protruding operation of this cylinder. The pressure of the sediment does not propagate forward because it contracts and the volume of the sediment chamber increases.

Then, when the cylinder retracts from the sediment chamber in preparation for the next stroke, and a space is created in the lower portion of the sediment chamber, the contracted jack extends in conjunction with this and extends toward the lower portion of the sediment chamber, Is pushed to the lower space where the cylinder was protruding. Therefore, in the next stroke, the sediment to be taken in by the cylinder is quickly prepared, and at the same time, the pressure in the sediment chamber is also stabilized.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes an excavator main body having a substantially tubular outer shape, and a direction correcting cylinder 3 is provided in front of the excavator main body through a bellows seal 2 and the like. The direction correcting cylinder 3 can be appropriately corrected in a so-called "swinging type" by the direction correcting jack 5 supported by the earth and sand transfer pipe 4 installed in the excavator body 1. A rotary shaft 7 having a large number of paddles 6 as stirring protrusions on the outer periphery is rotatably held in the earth and sand transfer pipe 4 located at the center of the excavator main body 1, and the rear end of the rotary shaft 7 is at the rear end of the excavator main body. 1 through the rear partition wall 8 to
It is operatively connected to a drive device 9 such as a motor installed in the rear excavator body 1.

As shown in FIG. 3, each of the paddles 6 has a triangular cross section, and one side thereof is positioned at right angles to the axial direction of the rotating shaft 7 and the front wall 6a.
And the other two sides form both side walls 6b. As shown in FIG. 1, a large number of paddles 6 are spirally arranged in the outer peripheral longitudinal direction of the rotary shaft 7, and the rotary shaft 7 constitutes a paddle screw. Further, a large number of paddles 6'consisting of plate-like protrusions having only a stirring function are provided on the outer periphery of the rear portion of the rotary shaft 7 located in the earth and sand chamber, which will be described later, because it does not require the conveyance of earth and sand.

On the other hand, a cutter member 12 projecting from a chamber 11 located inside the direction correcting cylinder 3 is fixed to the tip of the rotary shaft 7. When the drive device 9 is actuated, the rotary shaft 7 rotates, and the cutter member 12 simultaneously rotates with it. Note that the slurry agent discharge hole 13 is located in front of the cutter member 12, and is configured to discharge the slurry agent sent from the inside of the starting shaft. Also chamber 11
It is the rotation support member 14 that rotatably holds the vicinity of the tip of the rotation shaft 7 therein, and the stirring blade 15 is fixed to the rotation shaft 7 immediately behind it. The stirring blades 15 are effective in scraping the earth and sand adhering to the inner wall of the chamber 11 to make the earth and sand transfer smooth, and kneading the earth and sand in the chamber 11 to make the nature of the earth and sand suitable for the transfer.

Thus, the space between the rear end of the sediment transfer pipe 4 and the partition wall 8 forms a sediment chamber 16. In the space below the earth and sand transfer pipe 4, an earth and sand pressure pump 17, which is an earth and sand pressure supply device, is installed. This earth and sand pump 17 is a cylindrical cylinder 18 that is slidable toward the earth and sand chamber 16, and this cylinder 18
A discharge port 20 of a soil and sand pressure-feeding pipe 20 which is composed of a piston 19 supported by an appropriate hydraulic jack so as to be slidable inside, and which extends from the lower portion of the partition wall 8 to the rear of the excavator body 1.
The cylinder 18 can be connected to a. Also this cylinder 18
The guide rail 21 is provided in the lower part of the earth and sand chamber 16.

Then, above the sediment chamber 16, the protrusion of the cylinder, contracts in the upper direction of the sand chamber with the extension, expands in the lower direction of the sediment chamber with the contraction of the cylinder, and changes the volume of the sediment chamber. A jack 22 is attached to allow it.

This embodiment is configured as described above. To explain the working condition, the drive machine 9 is operated and the excavator body 1 is moved from the vertical shaft to the earth by a separately provided jack (not shown). When propelled inside, the cutter member 12 rotates while the slurry agent is discharged from the slurry discharge hole 13 to cut the ground in front, and the earth and sand produced thereby are stirred blades 15 and the rotating shaft in the earth and sand transfer pipe 4. It is sufficiently mixed by the paddles 6 of the paddles 7 and is aligned in the longitudinal direction of the rotary shaft 7 and hits the side wall 6b of each paddle 6 to be pushed backward. As shown in FIG. 3, the soil 23 hits the side wall 6b of each paddle 6, is pushed by the rotation of each paddle 6 (arrow R), and moves rearward along the side wall 6b as indicated by arrow P. In this way, the earth and sand are smoothly conveyed in the earth and sand transfer pipe by the paddle screw consisting of the paddle 6 and the rotating shaft 7 and transferred to the earth and sand chamber 16 at the rear. At this time, the earth and sand are transported in the same manner as described above even if the rotation of the rotary shaft 7 is appropriately reversely rotated so that the machine itself does not rotate.

Then, since the sediment reaching the sediment chamber 16 accumulates in order from the bottom of the sediment chamber 16, if the cylinder 18 of the sediment pump 17 is slid at this stage, the accumulated sediment is taken into the cylinder 18. And is connected to the discharge port 20a of the earth and sand pressure feeding pipe 20. Then the piston 19 in the cylinder 18
Is pushed out, and the taken in sediment is pipe 20
It pushes it in and discharges it backwards.

During the earth and sand discharging operation, the excavator main body 1 is propelled even while the cylinder 18 is sealing the earth and sand, and the earth and sand excavated by the paddle screw are successively transferred to the earth and sand chamber 16
Although it is sent to the earth and sand chamber 16 and is filled with high pressure, the jack 22 is gradually contracted in conjunction with the protruding operation of the cylinder 18, so that the volume of the earth and sand chamber 16 increases and The pressure does not rise above a certain value, and the pressure does not propagate to the front of the excavator body 1.

Then, when the pumping of the earth and sand in the cylinder 18 is completed and the cylinder 18 withdraws the earth and sand together with the piston 19 into the lower portion of the earth and sand transfer pipe 4 in order to take in the earth and sand again, the jack 22 interlocks with the drawing operation of the cylinder 18 and the jack 22 suddenly. It extends and projects, pushing down the earth and sand.

Then, since the portion occupied by the cylinder 18 until now becomes a space, the earth and sand flow into the space.

Therefore, the sediment chamber 16 in front of the cylinder 18 of the sediment pump 17
The soil is replenished with the soil, and the next sediment can be taken up by the cylinder 18.

Although the paddle 6 has a triangular cross-section in the above embodiment, the paddle 6 is not limited to this, and if the distance between both side walls becomes gradually narrower toward the rear, the sand transfer function and the agitation function will be provided. It has the same function.

(Effects of the Invention) The present invention has the above-described configuration. Since a large number of paddles serving as stirring and projecting members are provided on the outer periphery of the rotary shaft of the cutter member, the sand excavated by the cutter member is transferred to the rear sand chamber. The soil can be agitated by each paddle into a suitable one for transfer. In addition, the paddle provided in the sediment transfer pipe is inclined so that both side walls gradually approach toward the rear, and is further provided in a spiral shape in the longitudinal direction of the rotation axis, so when the sediment hits this side wall, the side wall is inclined by the inclination of the side wall. It is pushed backward and transferred, where it hits the side wall of the next paddle and is moved backwards, so that the paddles hit the soil pushed backwards one after another, and the sand is swept quickly and efficiently behind the excavator. Can be transported to the sand chamber. Further, since the paddle provided in the earth and sand chamber is plate-shaped, it only agitates the earth and sand and makes the earth and sand stand by in the earth and sand chamber to prepare for the earth and sand conveyance by a jack and a cylinder described later.

A paddle screw consisting of such a paddle and a rotating shaft has a sand / sand conveying ability regardless of whether it is rotated to the left or right. You can dig without diminishing. Further, the rotation of the cutter member can be sometimes reversed during the propulsion of the excavator to prevent the excavator itself from rotating.

Further, since the jack which can change the volume of the sand chamber is provided in the sand chamber, the fluctuation of the pressure in the sand chamber can be suppressed. Therefore, the pressure fluctuation of the cutter portion is suppressed, the burden on the problem is prevented, and smooth cutting is possible.

In addition, adverse effects on the ground are prevented, unexpected situations such as ground subsidence and ground uplift are prevented, and excavation work can be performed safely.

Moreover, the expansion and contraction of the jack is interlocked with the expansion and contraction of the cylinder, and when the cylinder protrudes to the bottom of the sand chamber, the jack contracts and the top of the sand chamber opens, the sand enters the relevant place, and the cylinder moves from the bottom of the sand chamber. When retracted, the jack extends toward the bottom of the sand chamber and pushes the sand in the chamber to the bottom, which makes it look like pushing the sand toward the space occupied by the linder. In addition, the suction of the earth and sand becomes good, and the earth and sand to be taken in by the cylinder in the next stroke is promptly prepared, the pumping efficiency is improved, and the rapid excavation work can be performed.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is a partial sectional side view of a machine of the present invention, FIG. 2 is a sectional view taken along the line AA in FIG. 1, and FIG. FIG. In the figure, 1 is an excavator main body, 4 is a sediment transfer pipe, 6 is a paddle, 7 is a rotary shaft, 8 is a partition wall, 9 is a drive device, 12 is a cutter member, and 16 is a sand chamber.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norio Kainuma 1-3-1 Uchisaiwaicho, Chiyoda-ku, Tokyo Tokyo Electric Power Co., Inc. (72) Inventor Hiroshi Ichinohe 1-3-1 Uchiyuki-cho, Chiyoda-ku, Tokyo East Within Kyodensha Co., Ltd. (56) References: Showa 57-147394 (JP, U) JP 61-47280 (JP, B2)

Claims (1)

[Claims] 1. A sediment transfer pipe and a sediment chamber in the rear of the excavator body are respectively provided, and a rotary shaft rotatably driven by an appropriate drive source is passed through the sediment transfer pipe, and a cutter member is provided at a front end of the rotary shaft. And an excavator having a sediment pumping device configured by a cylinder projecting from one end of the lower part of the earth and sand chamber and connectable to a discharge port at the other end of the lower part, and a piston slidable in the cylinder. A cross section in which a large number of paddles are provided on the outer periphery of the rotary shaft, and the paddles located in the earth and sand transfer pipe have narrower widths as the distance between both side walls forming left and right side surfaces with respect to the rotation axis direction becomes rearward. And provided in a spiral shape in the longitudinal direction of the rotary shaft, each paddle located in the earth and sand chamber is plate-shaped, and further contracts in the upper direction of the earth and sand chamber with the protrusion and extension of the cylinder, A jack that extends in the lower direction of the sediment chamber with contraction of the binder and changes the volume of the sediment chamber is provided at the upper portion of the sand chamber. Excavator.