JP2000065505A - Tip point stroke meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable freely adjusting a head stroke by rotatably installing a roller driven along an internal cylinder of a tip point device at a lever held by an axis of a frame and determining a revolution number of the roller. SOLUTION: A frame F2 made of a metal piece is fixed to a cover F1 with a bifurcated part directed downward. A rectangular lever F3 is held between the bifurcated part by an axis, where the lever F3 provided a rotation axis connected to the frame F2 at an end and a pair of rollers F4a, F4b at other end. The rollers F4a, F4b made of a nonskid material such as rubber holds an end of the lever F3 from both sides to rotate in contact with an outer circumference of an internal cylinder. The rollers F4a, F4b are truncated cone-like, where a taper angle of each roller is set at an angle approximated to an outer circumference curvature of the internal cylinder and arranged with a small diameter side directed toward the lever F3 side. A multiple rotation type of potentiometer F5 is equipped coaxially with the roller F4b and converts its rotation to a voltage value to calculate a stroke of the internal cylinder C4 for determining a revolution number.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small diameter propulsion method for laying cable laying pipes, water and sewage pipes, gas pipes, and the like in the soil without digging, and in the field of small-diameter propulsion method, laying pipes in a compacted and non-discharged manner. The present invention relates to a stroke meter of a leading-edge device that promotes the above.

[0002]

2. Description of the Related Art A pipe laying process in a tip device of a compacted non-discharge type by a small-diameter pipe propulsion method will be described with reference to FIGS. This is a method of digging first from the starting shaft A to the reaching shaft B with the tip device C, and laying the pipe E by pushing in while adding the pipe E.

FIG. 8 (A) → The main pushing device D is installed in the starting shaft A, and the tip device C is installed thereon.

FIG. 8 (B) → Main push jack D1 of the main push device
And press-fit the tip device C into the soil.

FIG. 8 (C) → Main push jack D of main push device D
1 to provide a gap corresponding to the length of the pipe laid in the soil.

[0008] FIG. 8 (D): A pipe E to be laid in the soil is loaded into the gap formed behind the tip device C.

Next, FIG. 9 shows a process of sequentially propelling the pipes E laid in the soil.

FIG. 9 (A) → The head C1 of the tip jack built in the tip device C is extended, and the soil is dug first.

FIG. 9 (B) → Main push jack D of main push device D
1 and the tip device C and the pipe E are propelled by the amount of pre-digging in the soil by the head C1 of the tip device in the previous process.

FIG. 9 (C) → The head C1 of the tip device C can slightly swing, and the direction is controlled by tilting and extending the head. The pipe propulsion construction proceeds while appropriately correcting the displacement of the propulsion direction in the tip device C by such a method.

FIG. 9 (D) → Repeat the process of “first excavation → push-in of the pipe E and the tip device C → retreat of the original pushing jack D1 → loading of the next pipe → first digging” to lay the pipe E while adding it. I will do it.

In such a construction method, when the head C1 is extended to perform excavation or direction control, it is necessary to grasp the operation state of the head C1 built in the tip device, that is, the state of the forward / backward movement of the tip jack. Therefore, a limit switch for detecting the extension limit and the contraction limit position of the tip jack is mounted.

FIGS. 6 and 7 show the limit switch. FIG. 6 shows a state where the head C1 of the tip device C is retracted, and FIG. 7 shows a state where the head C1 is extended.

FIG. 6 → A receiver C6 is provided at the base of the tip jack C5, and a limit switch C10 for detecting a limit of shrinkage is mounted on the receiver C6. When the tip jack C5 is retracted, one end surface of the cylinder tube C5 (a) in the tip jack C5 comes into contact with the limit switch C10 to detect the limit of contraction of the tip jack.

FIG. 7 → The limit switch C8 for detecting the extension limit position is attached to the outer cylinder C2 of the tip device via a lid. When the piston rod C5 (b) extends, the inner cylinder C4 housing the jack jack C5 is also moved, and the inner cylinder C5 is moved.
The striker C9 attached to the end face of No. 4 contacts the limit switch C8 to detect the extension limit position.

The inner cylinder C4 containing the tip jack C5 is rotatably supported about the spherical seat C3 as a center of rotation. Therefore, the direction control operation can be performed by tilting the inner cylinder C4 in the vertical and horizontal directions about the ball seating surface C3 as the center of rotation by the direction control mechanism C7.

[0017]

However, the above-mentioned tip device can only detect the extension limit position and the contraction limit position of the tip jack, and has the following problems.

With the improvement of the direction control technology of the tip device, there is a demand for adjusting the extension stroke of the head to cope with delicate control. In this regard, in the conventional technology, only two points, the extension limit and the contraction limit, can be detected, and therefore, the extension stroke of the head cannot be arbitrarily adjusted. Therefore, a sensor for detecting the stroke of the tip jack itself for operating the head of the tip device has been required.

Accordingly, an object of the present invention is to provide a tip stroke meter which can arbitrarily adjust a stroke of a head in a tip device.

[0020]

SUMMARY OF THE INVENTION A tip stroke meter according to the present invention comprises a frame fixed to the inner surface of an outer cylinder of a tip device, a lever pivotally supported by the frame, and a tip rotatably attached to the tip of the lever. It is characterized by comprising a roller driven by the inner cylinder of the device and a rotation speed measuring means for determining the rotation speed of the roller.

Here, the shape of the frame is not particularly limited, but is preferably a portal type. At this time, it is preferable that the lever is pivotally supported while being sandwiched between the forked portions of the portal frame. The shape of the lever is not particularly limited. For example, a rectangular plate-like piece can be used for the lever.

Preferably, the shape of the roller is a truncated cone, and the taper angle thereof corresponds to the outer peripheral curvature of the inner cylinder of the tip device with which the roller contacts. Thereby, the roller is smoothly rotated along the outer peripheral surface of the inner cylinder. Although the number of rollers is not particularly limited, it is preferable that a pair of rollers be prepared and provided so that each roller sandwiches the lever.
At this time, by mounting the rollers such that the small diameter side of each roller faces the lever side, the rollers can be easily arranged along the outer peripheral surface of the inner cylinder.

As means for measuring the number of rotations of the roller,
Examples include an encoder and a potentiometer. If the number of rotations of the roller is obtained, the stroke length of the inner cylinder can be obtained.

Further, it is preferable that the elastic member is provided between the inner surface of the outer cylinder and the lever, and the elastic member always presses the lever downward. This ensures that the roller comes into contact with the inner cylinder and does not run idle. It is preferable that a detachable lid is provided on the outer cylinder on which the frame is mounted, and the frame is fixed inside the lid.

[0025]

Embodiments of the present invention will be described below. 1 and 2 show a state in which the tip stroke meter of the present invention is mounted in a tip device. FIG. 1 is a longitudinal sectional view showing a state in which the tip jack is retracted, and FIG. 2 is a longitudinal sectional view showing a state in which the tip jack is extended.

First, the outline of the tip device C will be described. This tip device is similar to the tip device shown in FIGS.
The same parts are denoted by the same reference numerals. As shown in FIGS. 1 and 2, the tip device C includes an outer cylinder C2 and an inner cylinder C4, and is configured to be able to slide the inner cylinder C4 with respect to the outer cylinder C2. The inner cylinder C4 has a tip head C1 integrated at one end and a tip jack C5 inside. The tip jack C5 is driven by sliding the cylinder tube C5 (a) with respect to the piston rod C5 (b), and moves the inner cylinder C4 integral with the cylinder tube C5 (a) forward and backward.

Here, a tip stroke meter F is provided between the outer cylinder C2 and the inner cylinder C4. Tip stroke meter F is outer cylinder C
2 is fixed to the inner surface of a lid (to be described later with reference to FIGS. 3 and 4), and the stroke meter F can be easily removed by attaching and detaching the lid. Details of the stroke meter F will be described with reference to FIGS. 3 is a front view of the stroke meter as viewed in the axial direction of the tip device, FIG. 4A is a side view of the stroke meter, and FIG. 4B is a bottom view of the stroke meter.

The stroke meter F includes a frame F2 fixed to the inner surface of the outer cylinder of the tip device C, and a lever F3 supported by the frame F2. A roller F4 (a) rotatably attached to the tip of the lever F3,
(B), the rollers F4 (a) and (b) are pressed against the inner cylinder C4 of the tip device, and the stroke length of the inner cylinder C4 is determined from the rotation speed of the rollers F4 (a) and (b). .

The frame F2 uses a gate-shaped metal piece (FIG. 3).
), And is fixed to the lid F1 with the forked portion facing downward. The lever F3 was pivotally supported between the forked portions of the frame F2 (FIG. 4). The lever F3 has a rectangular plate shape, has a rotating shaft at one end for connection to the frame F2, and has a pair of rollers F4 (a) and (b) at the other end.

Each of the rollers F4 (a) and (b) is a lever F3.
(See FIGS. 3 and 4B). This is to prevent the inner cylinder C4 from tilting in the left-right direction by the control operation of the tip device C in the left-right direction, and to prevent the single roller from contacting the outer peripheral surface of the inner cylinder C4 and slipping. . Since the rollers F4 (a) and (b) are rotated in contact with the outer peripheral surface of the inner cylinder C4 of the tip device, it is preferable that the rollers F4 (a) and (b) are made of a material that is not slippery. In this example, the roller is made of rubber. In addition, each roller F4
(A) and (b) have a truncated cone shape, and are arranged to face each other such that the small diameter side faces the lever side. This is the inner cylinder C
This is because the outer periphery of 4 is formed of a cylindrical surface, so that the roller can be smoothly rotated by using a roller having a shape along the cylindrical surface. Therefore, each roller F4 (a),
The taper angle of (b) is set to an angle that approximates the outer curvature of the inner cylinder C4.

The rollers F4 (a) and (b) are
Compression spring F6, which is an elastic material,
Was used (FIG. 4A). This is because the inner cylinder C4 is tilted up and down by the control operation of the tip device C in the up and down direction, and the rollers F4 (a) and (b) follow this amount of rotation to prevent the rollers from running idle. That's why. The compression spring F6 is interposed between the inner surface of the lid F1 and an intermediate portion of the lever F3. The lever F3 is constantly pressed downward by the action of the compression spring F6, and the rollers F4 (a) and (b) are pressed against the inner cylinder C4 of the tip device, thereby preventing the rollers from idling.

Further, one of the rollers F4 (b) is provided with a multi-rotation type potentiometer F5 as a rotation speed measuring means so that the rotation speed of the roller can be obtained (see FIGS. 3 and 4B). The potentiometer F5 is mounted coaxially with one of the rollers F4 (b), and is supported by being connected to a support F7 protruding from the lever F3 by a connecting plate F8 (FIG. 4B). With this potentiometer F5, the roller F4
The rotation of (a) and (b) is converted into a voltage value, and the voltage value is converted into a rotation speed. If the number of rotations of the roller is known, the inner cylinder C
4 can be obtained by calculation.

As shown in FIG. 5, a limit switch is also provided in this tip device in order to detect the extension limit and the contraction limit. The limit switch C8 for detecting the extension limit is mounted inside the outer cylinder C2 of the distal end device, and is arranged at an interval of about 45 degrees in the circumferential direction from the distal end stroke meter F. A limit switch (not shown in FIG. 5) for detecting the contraction limit is provided on the inner surface of the receiving tool C6, similarly to the tip device of FIGS.

By using such a tip stroke meter, the stroke length of the inner cylinder can be accurately detected, and the extension amount of the tip head can be finely adjusted, so that the direction control accuracy of the tip device can be improved. Can be.

[0035]

As described above, the tip stroke meter of the present invention can measure the stroke of the tip device. Therefore, as a means for performing delicate control when controlling the direction of the tip device, the amount of extension of the head can be controlled, and the direction control of the tip device can be performed with higher accuracy.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a tip device equipped with a tip stroke meter of the present invention when the head is retracted.

FIG. 2 is a longitudinal sectional view of the tip device equipped with the tip stroke meter of the present invention when the head is extended.

FIG. 3 is a front view showing a mounted state of the tip stroke meter of the present invention.

4A is a side view of FIG. 3 as viewed in the direction of arrow H, and FIG.
It is an arrow I bottom view of (A).

FIG. 5 is a sectional view taken along the line GG of FIG. 1;

FIG. 6 is a longitudinal sectional view of the tip device in a state where the head is retracted.

FIG. 7 is a longitudinal sectional view of the tip device in a state where the head is extended.

FIG. 8 is an explanatory view showing a first half of a pipe laying process in a compacted non-discharged tip device by a small-diameter pipe propulsion method.

FIG. 9 is an explanatory view showing a latter half of a pipe laying process in a compacted non-discharged tip device by a small-diameter pipe propulsion method.

[Explanation of symbols]

Reference Signs List A Starting shaft B Reaching end C End device C1 Head C2 Outer cylinder C3 Spherical seat C4 Inner cylinder C5 Tip jack C5 (a) Shilling tube C5 (b) Piston rod C6 Receiver C7 Direction control mechanism C8 Limit switch C9
Striker C10 Limit switch D Main pusher D1 Main push jack E Pipe F Tip stroke meter F1 Lid F2 Gate frame F3 Lever F4 (a) Conical roller F4 (b) Conical roller F5 Potentiometer F6 Spring F7 Support F8 Connecting plate

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ryunosuke Seki 3-18-10 Moto Asakusa, Taito-ku, Tokyo Inside IREC Engineering Co., Ltd. (72) Inventor Makoto Tonishi 3--18 Moto-Asakusa, Taito-ku, Tokyo No. 10 Airec Giken Co., Ltd. F term (reference) 2D054 AC18 BA19 GA17 GA72 GA92 2F062 AA02 BB04 BC48 CC22 EE26 EE64 FF03 GG21 GG51 GG64 GG69 HH05 HH15 HH22 HH32

Claims (4)

[Claims] A frame fixed to an inner surface of an outer cylinder of the tip device; a lever pivotally supported by the frame; a roller rotatably mounted on the lever and driven by the inner cylinder of the tip device; And a rotation speed measuring means for determining a rotation speed of the tip. 2. The tip stroke meter according to claim 1, wherein the roller has a truncated conical shape, and a taper angle of the roller substantially corresponds to an outer peripheral curvature of an inner cylinder of the tip device with which the roller contacts. 3. The tip stroke meter according to claim 1, wherein there are a pair of rollers, and each roller is mounted so as to sandwich the lever. 4. The distal end according to claim 1, further comprising an elastic material interposed between the inner surface of the outer cylinder and the lever, wherein the elastic material is configured to always press the lever toward the inner cylinder. Stroke meter.