JPH0720400U - Propulsion body for propulsion method - Google Patents

Abstract

(57) [Summary] [Structure] A plurality of propulsion pipes 2 are flexibly connected to each other, and a propulsion head 1 is flexibly connected to the propulsion pipe 2 at the distal end to form the propulsion head 1. Of the propulsion head body 1A and the drive shaft 12 that is fitted into the propulsion head body 1A so as to be rotatable in the drive head body 1A, and the front conductor 3 is attached to the front portion of the front conductor 3 attached to the tip of the drive shaft 12. A pressure sensor 18 for forming a tip surface F1 and an inclined pressure receiving surface F2 that are orthogonal or substantially orthogonal to the axis and detecting the earth pressure acting on the tip surface F1 and the earth pressure acting on the inclined pressure receiving surface F2 separately. Is provided. [Effect] Accurate increase of earth pressure between the front obstacle and the front conductor over a wide area in front of the front conductor, and
It is possible to detect quickly, the existence of obstacles can be surely known over the above range, and it is possible to avoid the collision between the leading conductor and the obstacle not only when the vehicle is traveling straight ahead but also at the beginning of turning. It is possible to reliably prevent damage to or obstacles.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 According to the present invention, a plurality of propulsion pipes are flexibly connected to each other, and a propulsion head for excavating earth and sand is flexibly connected to a tip propulsion pipe to form the propulsion head. A propulsion head main body and a drive shaft which is fitted into the propulsion head main body so as to be rotatable in a drive manner are provided, and a front conductor is attached to the tip of the drive shaft, and the front conductor is attached to the front portion of the front conductor. With the tip surface orthogonal or almost orthogonal to the axis of the and the front conductor not rotated, earth pressure is applied as the propulsion head is propelled into the ground, and the propulsion is performed in the direction in which the earth pressure is applied. The present invention relates to a propulsion body for a propulsion method, in which an inclined pressure receiving surface for orienting the propulsion direction of the operating head is formed.

[0002]

[Prior art]

 Conventionally, the above-mentioned propulsion method thruster has not been provided with a pressure sensor for detecting the earth pressure acting on the propellant.

[0003]

[Problems to be solved by the device]

 According to the above conventional configuration, the propulsion method for propulsion method is not provided with a pressure sensor for detecting the earth pressure acting on the propulsion method. Therefore, for example, when there is an obstacle in the soil, Even if the earth pressure between the front conductor and the obstacle increases as the vehicle approaches the obstacle, the front conductor is propelled and collides with the obstacle without knowing it, and There was a risk of damaging the. Therefore, for example, it is possible to detect an increase in earth pressure by detecting the hydraulic load of the propulsion hydraulic cylinder that propels the propulsion body.In this case, however, if the hydraulic hose is long, the hose may expand. As a result, the detection error becomes large, and it is difficult to detect the rise in earth pressure accurately and quickly. The present invention has been made in view of the above points, and its purpose is to accurately measure the earth pressure between the front conductor and the obstacle, which rises as the front conductor approaches the obstacle in the soil. Another object of the present invention is to provide a propulsion unit for propulsion method that can be detected promptly and can avoid collision between the leading conductor and an obstacle.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the characteristic structure of the propulsion body for propulsion method according to the present invention is that a pressure sensor for detecting the earth pressure acting on the tip surface and the earth pressure acting on the inclined pressure receiving surface are separately provided. It is provided on the front conductor, and its function and effect are as follows.

[0005]

[Action]

 In other words, pressure sensors are installed on the lead conductor to detect the earth pressure acting on the tip surface and the earth pressure acting on the inclined pressure receiving surface separately. When the surface and the obstacle face each other or the inclined pressure receiving surface and the obstacle face each other, the pressure sensor can electrically detect an increase in the earth pressure acting on the tip surface or the inclined pressure receiving surface. As a result, there is no detection error caused by the expansion of the hydraulic hose as when detecting the increase in earth pressure by detecting the hydraulic load of the propulsion hydraulic cylinder, and the increase in earth pressure can be accurately determined. In addition, it can be detected quickly. Moreover, with the configuration described above, it is possible to detect the increase in the earth pressure between the tip surface and the obstacle and the increase in the earth pressure between the inclined pressure receiving surface and the obstacle separately. Since the front conductor is rotatable about the shaft center via the drive shaft, if the obstacle is in a position off the shaft center in front of the front conductor and does not face the inclined pressure receiving surface. Also, the rotation of the lead conductor causes the inclined pressure receiving surface to face the obstacle, and the rise in earth pressure between the obstacle and the lead conductor at that position can be similarly detected. As described above, according to the above configuration, an increase in earth pressure between the obstacle in front and the front conductor can be detected accurately and quickly over a wide range in front of the front conductor.

[0006]

[Effect of device]

 Therefore, the increase in earth pressure between the obstacle in front and the front conductor can be detected accurately and quickly over a wide range in front of the front conductor, so that the existence of the obstacle can be ensured over the wide range. Therefore, it is possible to avoid the collision between the lead conductor and the obstacle not only when the vehicle goes straight ahead but also at the beginning of turning, and it is possible to reliably prevent damage to the lead conductor and the obstacle due to the collision. We were able to provide a propellant.

[0007]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, a group of pipes each having an outer surface in the form of a cylindrical surface, that is, a propulsion head 1 having an outer surface having a cylindrical surface and a plurality of propulsion tubes 2 having an outer surface having a cylindrical surface (for example, a small diameter). A pipe group having a diameter of around 100 mm or less) is flexibly connected through a joint J so that the pipe group can be bent in the soil and propelled by a pushing device (not shown). The propulsion body for the propulsion method is constructed as described above.

The propulsion head 1 is fitted in a tubular propulsion head body 1A, and is driven and rotated about a shaft center P along the longitudinal direction with respect to the head body 1A so that the propulsion head 1 can be driven in and out in the propulsion direction. A piston portion 12 (an example of a drive shaft) is provided, and a tip conductor 3 having a diameter larger than that of the piston portion 12 is attached to the tip of the piston portion 12, and the tip conductor 3 is arranged together with the piston portion 12 around the axis of the head body 1A. A rotating mechanism 4 for rotating the guide body 3 and an extending / contracting mechanism 5 for moving the leader 3 in and out of the head body 1A in the axial direction are provided. The leading conductor 3 is fitted into the head body 1A so as to be rotatable around an axial center thereof, and is fitted into the rotary shaft 8 and the cylindrical hole 14 of the piston portion 12 of the leading conductor 3, and the piston portion 12. By fitting with the cylinder portion 13 of the head body 1A which is fitted onto the piston portion 12, the head body 1A is supported so as to be relatively rotatable and relatively movable in the axial direction. At the front portion of the tip conductor 3, a tip surface F1 orthogonal to the axis of the tip conductor 3 and the earth pressure is generated as the propulsion head 1 is propelled in the ground without rotating the tip conductor 3. An inclined pressure receiving surface F2 for directing the thrusting direction of the propulsion head 1 in the direction receiving the earth pressure is formed. Then, two pressure sensors 18 for detecting the earth pressure acting on the tip surface F1 are built in on the tip surface F1 side (see FIG. 3), and the soil acting on the tilt pressure receiving surface F2 is provided on the tilt pressure receiving surface F2 side. One pressure sensor 18 for detecting pressure is built in. The pressure sensor 18 is composed of a contactor 18A that directly receives earth pressure and a disc-shaped load cell 18B that receives earth pressure via the contactor 18A. In the state where they are accommodated in the hole H, a ring-shaped lid member 19 having a male screw portion on the outer peripheral portion is screwed to the inner female screw portion of the pressure sensor accommodation hole H. The contactor 18A has a stepped rod shape including a large diameter portion and a small diameter portion. The large diameter portion is located inside the pressure sensor housing hole H, and the tip surface of the small diameter portion is directly exposed to earth pressure. The small diameter portion is inserted into the hollow portion of the lid member 19 so as to be capable of contacting. A notch groove 20 is formed in the upper surface of the lid member 19 for inserting the tip of a screwdriver. In FIG. 1, B is a bush for allowing the contactor 18A to smoothly slide. The bush B also has a role of preventing the inflow of earth and sand from around the contactor 18A to the load cell 18B side. Further, in FIG. 1, S1 is a first spring for pressing and fixing the load cell 18B on the bottom of the pressure sensor housing hole H. Further, in FIG. 1, S2 is a second spring for keeping the contactor 18A constantly in pressure contact with the load cell 18B. By providing the first spring S1, the load cell 18B can be stably fixed to the front conductor 3 to accurately measure the earth pressure, and by providing the second spring S2, the soil can be obtained. It is possible to improve the response of rising at the time of pressure detection. Although not shown, a well-known lubricant discharging means for discharging a lubricant for reducing frictional resistance between the earth and sand and the tube group is provided at the tip of the front conductor 3. As described above, since the pressure sensor 18 for separately detecting the earth pressure acting on the tip surface F1 and the earth pressure acting on the inclined pressure receiving surface F2 is provided in the front conductor 3, the front conductor 3 is provided in front of the front conductor 3. If there is an obstacle, the pressure sensor 18 can accurately and quickly detect an increase in the earth pressure acting on the tip surface, so that the presence of the obstacle in front of the front conductor 3 can be reliably known. It is possible to avoid the collision between the leading conductor 3 and the obstacle when the propelling body 2 is moving straight ahead. Further, even when the obstacle is at the position facing the inclined pressure receiving surface F2, the pressure sensor 18 can accurately and quickly detect the increase in the earth pressure acting on the inclined pressure receiving surface F2, and further Since the body 3 is rotatable about the axis through the piston portion 12, even if the obstacle is located off the axis in front of the front conductor, the tilt pressure-receiving surface F2 is used as an obstacle. Since they can face each other, the existence of an obstacle at a position deviated from the axis can be surely known, and a collision between the front conductor 3 and the obstacle at the beginning of turning can be avoided.

The rotating mechanism 4 includes a spiral groove 6 formed in a part of the inner peripheral surface of the propulsion head main body 1 A, and a screwing convex portion 7 a screwed into the spiral groove 6 for propulsion. A hydraulic piston 7 fitted in the head main body 1A, a rotary shaft 8 having a spline shaft portion 8a formed on an outer peripheral portion for meshing with a spline hole portion 7b formed on the inner surface side of the hydraulic piston 7, and the hydraulic pressure A pair of pressure oil supply passages 9A and 9B (see FIG. 2) that supply and discharge pressure oil to and from the pressure receiving chambers 10 on both sides of the piston head 7c of the piston 7 to reciprocate the hydraulic piston 7 in the axial direction of the head body 1A. And are equipped with. Inside the rotating shaft 8, a pressure oil supply / discharge passage 11 for the expansion / contraction mechanism 5 described later is formed in addition to the two hydraulic pipes forming the pressure oil supply passages 9A, 9B. Both the supply / discharge passage 11 and the hydraulic pipe are guided to the rear propulsion pipe 2 through the joint portion J. In the rotating mechanism 4 configured as described above, the pressure oil is supplied from one pressure oil supply passage 9A (or 9B) to the propulsion head main body 1A, and the other pressure oil supply passage 9B (or 9A) is propelled. When pressure oil is returned from the head main body 1A, the hydraulic piston 7 reciprocates. With the movement, the hydraulic piston 7 in which the screwing convex portion 7a is screwed into the spiral groove 6 of the head main body 1A. Rotates in the forward and reverse directions, and the rotation shaft 8 rotates in the forward and reverse directions following the rotation, and further, the front conductor 3 is driven to rotate around the axis P by following the rotation. The leading body 3 is adapted to rotate at least 360 degrees or more while the hydraulic piston 7 reciprocates once.

The expansion / contraction mechanism 5 is a bottomed cylindrical piston portion integrally formed with the front conductor 3 so as to be slidably fitted on the rotation shaft 8 of the rotation mechanism 4 in the axial direction. 12, a cylinder portion 13 of the head body 1A in which the piston portion is housed, and pressure oil is supplied to the internal space of the cylinder portion 13 through a supply / discharge passage 11 formed in the rotating shaft 8. Pressure fluid supply device (not shown). This expansion / contraction mechanism 5 is provided with pressure receiving surfaces 12a and 14a on both the bottom of the cylindrical hole of the piston portion 12 and the rear end surface of the piston portion 12 in the traveling direction, and the rotary shaft 8 end surface and the cylinder. Pressure chambers 15 and 16 are formed between the inner surface of the portion 13 and the inner surface. A communication passage 17 that allows the flow of the pressure fluid from the pressure fluid supply device side is provided for both the pressure chambers 15 and 16. That is, the cylindrical hole of the piston portion 12 is formed with respect to the spline portion 8b formed on the outer peripheral surface of the rotating shaft 8 and the outer peripheral surface on the rear side in the propulsion direction with respect to the place where the spline portion 8b is formed. The communication passage 17 is formed by forming 14 with a slightly larger size so as to form a gap that allows the flow of pressure oil. The expansion mechanism 5 is provided with the pressure chambers 15 and 16 only on the side from which the front conductor 3 is pushed out, and in the direction in which the front conductor 3 is pulled into the cylinder portion 13, the pushing force of the subsequent propulsion pipe 2 causes It is configured to be performed.

When the tube group is moved straight by using the propelling body having the above structure, the hydraulic oil piston 7 is reciprocated by continuously sucking and discharging the hydraulic oil via the hydraulic oil supply paths 9A and 9B. The reciprocating movement pushes the propulsion tube 2 while rotating the rotary shaft 8, that is, the front conductor 3. Further, when the direction is corrected using the propulsion body, the propulsion tube 2 is pushed in with the inclined pressure receiving surface F2 facing the side opposite to the side to be swung, without rotating the leading conductor 3 as described above. Go out. Then, the inclined pressure receiving surface F2 receives the earth pressure, the propulsion direction of the propulsion head 1 is directed in the direction opposite to the inclined pressure receiving surface F2, and the propulsion head 1 rotates.

[Other Embodiments] The number of pressure sensors 18 provided on the tip surface F1 and the inclined pressure receiving surface F2 is not limited to that in the above-described embodiment.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a side view showing a tip side of a propulsion head of a propelling body.

FIG. 2 is a sectional view of a propulsion head of a propulsion body.

FIG. 3 is a front view of the leading conductor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Propulsion head 1A Propulsion head main body 2 Propulsion pipe 3 Lead conductor 12 Drive shaft 18 Pressure sensor F1 Tip surface F2 Inclined pressure receiving surface

Front page continued (72) Inventor Takashi Togawa 1-1-1, Hama, Amagasaki City, Hyogo Prefecture Kubota Technology Development Laboratory Co., Ltd. In development lab

Claims (1)

[Scope of utility model registration request] 1. A plurality of propulsion pipes (2) are flexibly connected to each other, and a propulsion head (1) for excavating earth and sand is flexibly connected to the tip propulsion pipe (2), To construct the propulsion head (1), a propulsion head body (1A) having a tubular shape and a drive shaft (12) which is rotatably fitted in the propulsion head body (1A) are provided. A tip conductor (3) is attached to the tip of the drive shaft (12), and a tip end surface (F1) orthogonal or substantially orthogonal to the axis of the tip conductor (3) is attached to the front portion of the tip conductor (3). Leading conductor (3)
Inclination for receiving the earth pressure as the propulsion head (1) is propelled into the ground without rotating the propulsion head (1) and directing the propulsion direction of the propulsion head (1) in the direction in which the earth pressure is received. A propellant for a propulsion method in which a pressure receiving surface (F2) is formed, and earth pressure acting on the tip end surface (F1) and earth pressure acting on the inclined pressure receiving surface (F2) are detected separately. A propulsion body for a propulsion method in which a pressure sensor (18) is provided on the preceding conductor (3).