JP2003301689A - Pipe for preventing turning of excavator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe for preventing the turning of an excavator, which can suppress the turning of the excavator and enables an easy return to an optimum attitude position. <P>SOLUTION: In this turning preventing pipe K which is to be connected to the excavator L, a cylindrical body 2, to which a plurality of turning preventing pieces 20 are fixed, is externally inserted into an outer periphery of a pipe body 1 so as to be freely turnable; and a lock means 5 for making the cylindrical body 2 unturnable with respect to the pipe body 1 during excavation work is provided in the pipe body 1. The lock means 5 is equipped with a hydraulic cylinder which is mounted in the pipe body 1, a pin inserting hole which is formed in an inner peripheral surface of the cylindrical body 2, and a lock pin which is advanced/retreated with respect to the cylindrical body 2 along with the extension or contraction of an output shaft of the hydraulic cylinder. When an end of the lock pin is inserted into the pin inserting hole, the cylindrical body 2 is made unturnable with respect to the pipe body 1. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation prevention tube (in this specification, referred to as a rotation prevention tube for an excavator) for preventing rotation of the excavator during excavation work.

[0002]

2. Description of the Related Art An excavator, during excavation work, inserts sand and gravel mixed with rock, which has been carved in the bit section, into a crusher chamber through a front opening, and the rock is crushed by an outer cone and an inner cone forming the crusher chamber. While crushing, the crushed rocks and gravel are sent and discharged as sludge along with the mud to the rear side in the traveling direction, but the mounting plate with the bit part and the inner cone rotate the motor through the reducer. It is rotated by force.

Further, the excavator is equipped with a hydraulic correction jack (comprising hydraulic cylinders arranged at intervals of 120 °) for advancing while correcting the excavation direction.
Therefore, a hydraulic system including an oil tank is provided inside the machine.

Further, the excavator is always pushed in by the propulsion jack during the excavation work, but when excavating within a certain range, the excavation pipe (fume pipe) is spliced and the pushing force is applied through the propulsion pipe. I am trying.

Therefore, by using the above-described excavator, a desired lateral hole can be dug into the ground.

However, since the bit portion is pressed against the bedrock during the excavation, the excavator is acted on by a turning force in the direction opposite to the direction of rotation of the motor, and the excavator gradually rotates along with the excavation to cause oil to travel. There is a problem that the tank moves to an inappropriate posture position and the oil supply in the hydraulic system is not normally performed (oil cannot be supplied from the tank to each device). When this happens,
The hydraulic equipment such as the correction jack will not function and the digging direction cannot be corrected. Therefore, conventionally, when the rotation of the excavator is within the range where the oil supply in the hydraulic system is normally performed, it is necessary to press the bit part against the ground and rotate the motor in the opposite direction to restore the optimum state. I was repeating.

As one means for solving the above problem, it is conceivable to fix rotation preventing pieces on the outer peripheral surface of the excavator at predetermined angular intervals to suppress the rotation of the excavator.

However, when this means is adopted,
Obviously, the rotation of the excavator is suppressed, but the excavator also rotates during the long distance excavation.
Further, in this case, even if the motor is rotated in the opposite direction while pressing the bit portion against the ground, there is a problem that the original optimum state cannot be restored due to the existence of the rotation preventing piece.

Therefore, in the industry where the machine is used,
It is hoped that a means will be developed that can suppress the rotation of the excavator and easily return it to the optimum posture position.

[0010]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a rotation preventive tube for an excavator which can suppress the rotation of the excavator and can easily return to the optimum posture position. .

[0011]

[Means for Solving the Problems]

(Invention of Claim 1) The anti-rotation tube of the excavator according to the present invention is a rotation preventing tube connected to the excavator, and has a plurality of anti-rotation pieces fixed to the outer periphery of the tube body. Is rotatably externally inserted, and locking means is provided in the pipe body to prevent the cylinder body from rotating with respect to the pipe body during excavation work. (Invention of Claim 2) The rotation preventing tube of an excavator according to the present invention relates to the invention of Claim 1, wherein the locking means is a hydraulic cylinder mounted in the tube body and an inner peripheral surface of the tubular body. It is provided with a pin insertion hole formed and a lock pin that moves forward and backward with respect to the cylinder as the output shaft of the hydraulic cylinder extends or contracts, and the end of the lock pin is inserted into the pin insertion hole. In some cases, the tubular body cannot rotate with respect to the tube body. (Invention of Claim 3) The rotation preventing tube of an excavator according to the present invention relates to the invention of Claim 2, wherein the pin insertion holes are provided on the inner peripheral surface of the cylindrical body at regular angular intervals. (Invention of Claim 4) The anti-rotation tube for an excavator of the present invention relates to the invention of any one of Claims 1 to 3,
On the front side of the pipe body, there is provided a universal joint for attaching to the excavator. The operation and effect of the rotation preventing tube of the excavator of the above invention will be described in the section of the following embodiments of the invention.

[0012]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to the drawings showing the embodiments. [Embodiment 1] FIG. 1 is a sectional view showing a state in which a rotation preventing pipe K of this embodiment is attached to a rear end of an excavator L, and FIG. 2 is a sectional view of the rotation preventing pipe K. (Regarding the Configuration of the Deflection Machine L) As shown in FIG. 1, the excavation machine L is composed of a first division part 6, a second division part 7 and a third division part 8, and the third division part The rotation preventing tube K is bolted to the rear end of the dividing portion 8 so as not to rotate relative to each other. It should be noted that in FIG. 1, the reference numeral H is a so-called fume pipe (propulsion pipe), the reference numeral 91 is a mud pipe for feeding mud into the crusher chamber 62, and the reference numeral 92 is shown. The thing is a discharge pipe for discharging gravel, crushed rock, and the like together with muddy water. Further, in FIG. 2, what is indicated by a symbol R is a seal ring.

As shown in FIG. 1, the first dividing portion 6 forms the crusher chamber 62 by inserting the gravel of rock mixed with the rock scraped by the bit portion 60 into the crusher chamber 62 from the opening of the mounting plate 61. The outer cone 63 and the inner cone 64 are portions for crushing rock. In addition,
The rotation of the mounting plate 61 and the inner cone 64 is as shown in FIG.
As shown in, the rotational force of the motor 70 of the second division portion 7 is transmitted via the speed reducer 65.

As shown in FIG. 1, the second dividing portion 7 is provided with the above-mentioned motor 70 and three hydraulic jacks 71 arranged at 120 ° intervals in the circumferential direction. By the operation of 71, the swinging operation of the first dividing portion 6 (correcting operation in the bending direction) can be performed.

As shown in FIG. 1, the third dividing portion 8 is a portion that should be called the heart of the hydraulic system, and is an electromagnetic valve 81 for operating the oil tank 80 and hydraulic equipment properly.
Etc. are provided. In addition, the hydraulic jack 71 described above.
The oil in the oil tank 80 is supplied to other hydraulic devices. (Regarding the configuration of the rotation prevention tube K) The rotation prevention tube K is shown in FIG.
As shown in FIG. 3 and FIG. 3, a tube body 2 to which a plurality of rotation preventing pieces 20 are fixed is rotatably externally attached to the outer periphery of the tube body 1, and the tube body 1 has a tube body for excavation work. Locking means 5 is provided to lock the body 2 relative to the tube body 1,
Further, a universal joint 3 is provided at the front of the pipe body 1 and a mud discharge pipe 4 is provided at the rear thereof.

As shown in FIG. 2, the tube main body 1 has a recess 10 having a wide range in the axial direction on the outer peripheral surface thereof.
Is externally inserted into the recess 10 so as not to move in the axial direction. Also,
As shown in FIG. 2, an inward protruding piece 12 having a bolt insertion hole 11 is provided on the front edge side of the pipe body 1, and the universal joint 3 is a bolt inserted (i.e., loosely inserted) into the bolt insertion hole 11. It is attached via 31.

As shown in FIG. 2, the cylindrical body 2 has a recess 10
It is composed of a cylindrical tube having the same thickness as the depth of the rotation prevention piece 2 as shown in FIG. 3 and FIG.
0 is the pin portion insertion holes 21 at a constant angular interval over the entire inner peripheral surface.
Are provided respectively.

As shown in FIG. 2, a shallow concave portion 22 is provided on the inner peripheral surface of the tubular body 2 and a shallow concave portion 13 is provided on the outer peripheral surface of the tube body 1, and these concave portions are provided. 1
Friction resistance at the time of relative rotation between the tube body 1 and the cylindrical body 2 is reduced by 3, 22.

As shown in FIG. 2, the universal joint 3 has a joint body 30 having a large diameter hole 30a and a small diameter hole 30b and a rubber plate 32 (elastic plate). The tip side of the tube body 1 is inserted into the large diameter hole 30a, and a rubber plate 32 is interposed between the tip surface of the tube body 1 and the stepped surfaces of the large / small diameter holes 30a and 30b. To be done. As shown in FIG. 2, the rubber plate 32 and the pipe body 1
The gap g is provided between the end surface of the universal joint and the front end surface thereof in order to increase the free area of the universal joint.

As shown in FIG. 2, the mud feed pipe 4 is basically composed of a short pipe, and has a feed hole 40 penetrating from the rear end face to the front end face and a discharge hole 41 opened to the outer peripheral face. And a peripheral hole 42 that connects the feed hole 40 and the discharge hole 41 to each other. The mud discharge pipe 4 is fixed to the pipe body 1 by welding or the like, and the fume pipe H
Is connected to the mud discharge pipe 4 via a connection collar 90. The muddy water is sent to the feed hole 40 via the pipe inserted through the fume pipe H, and is discharged to the discharge hole 41 via the peripheral hole 42.
Emitted from.

Basically, as shown in FIGS. 3 to 5, the lock means 5 is in a state where the lock pin portion 51a is inserted into the pin portion insertion hole 21 when the output shaft of the hydraulic cylinder 54 is in a shortened state (FIG. 4). Lock state) and the hydraulic cylinder 54
Of the output shaft of the lock pin 51a
Is adapted to come out of the pin insertion hole 21 (unlocked state in FIG. 5).

Here, in this embodiment, the locking means 5 is used.
3 to 5, a box 50 having a vertical hole 50a and a driven shaft 51 having a lock pin portion 51a are provided.
A linear cam plate 52 having a cam forming hole 52a, a horizontal shaft 53 inserted into the vertical hole 50a and the cam forming hole 52a, a hydraulic cylinder 54, and the hydraulic cylinder 54.
And the like, and the hydraulic cylinder 5
The coil spring 56 is interposed between the output shaft of No. 4 and the linear cam plate 52, and the guide 57 for preventing the coil spring 56 from bending. Therefore, as the output shaft of the hydraulic cylinder 54 moves, its force is
6 → direct-acting cam plate 52 → transverse shaft 53 → driven shaft 51, and the lock pin portion 51a is inserted into and removed from the pin portion insertion hole 21 as described above. The locking means 5 is
The driven shaft 51 may be attached to the output shaft end of the hydraulic cylinder 54, and the lock pin portion 51a may be inserted into or removed from the pin portion insertion hole 21 as the output shaft of the hydraulic cylinder 54 is shortened or extended. (About the excellent function of the excavator L with the rotation prevention tube K attached) When the excavation work is performed, the locking means 5 brings the tubular body 2 into a non-rotatable state (locked state) with respect to the tube body 1. In this case, the following functions are provided. ． Due to the presence of the plurality of rotation prevention pieces 20 provided on the outer periphery of the tubular body 2, the rotation of the excavator L can be suppressed. ． When the excavation direction is changed by the hydraulic jack 71, the universal joint 3 of the anti-rotation tube K bends accordingly,
The force received from the borehole wall can be absorbed. ． Since the mud water is discharged from the discharge hole 41 of the mud discharge pipe 4 through the pipe inserted through the fume pipe H, the pushing resistance of the fume pipe H can be reduced. B. When the excavator L is returned to the optimum posture position, the locking means 5 brings the tubular body 2 into a rotatable state (unlocked state) with respect to the pipe body 1.

The motor 70 is rotated in the opposite direction while pressing the bit portion 60 against the ground. In this case, since the cylindrical body 2 is in a rotatable state with respect to the tube body 1, the rotation preventing piece 20 does not interfere when returning to the original optimum state. [Other Embodiments] In the above-described first embodiment, the rotation preventing pipe K is provided with the universal joint 3 and the mud discharge pipe 4, but these structures are only required to achieve the effect of the present invention. It may or may not be present.

[0024]

The present invention having the above-mentioned structure has the following effects.

As is apparent from the contents of the section of the embodiment of the invention, it is possible to provide a rotation preventing tube for a machine, which can suppress the rotation of the machine and can easily return the machine to an optimum posture position.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which a rotation prevention tube according to an embodiment of the present invention is attached to an excavator.

FIG. 2 is a cross-sectional view of the rotation prevention tube.

3 is a cross-sectional view taken along line XX of FIG.

FIG. 4 is a cross-sectional view showing a state in which the tubular body is incapable of rotating (locked state) with respect to the tube main body that constitutes the rotation prevention tube.

FIG. 5 is a cross-sectional view showing a state in which the tubular body is rotatable (unlocked state) with respect to the tube body that constitutes the rotation prevention tube.

[Explanation of symbols]

L machine K rotation prevention tube 1 tube body 2 cylinders 3 universal joints 4 Mud discharge pipe 5 Locking means 6 First division 7 Second division 8 Third division 20 Rotation prevention piece 21 Pin insertion hole 51a lock pin 54 hydraulic cylinder

Claims (4)

[Claims] 1. An anti-rotation tube connected to an excavator, wherein a tubular body having a plurality of anti-rotation pieces secured to the outer periphery of the tube body is rotatably inserted into the tube body, and the tube is advanced into the tube body. A rotation prevention tube for an excavator, characterized in that a lock means is provided to prevent the cylinder body from rotating relative to the tube body during work. 2. The lock means includes a hydraulic cylinder mounted in the pipe body, a pin insertion hole formed in an inner peripheral surface of the cylinder, and a cylinder provided with expansion or contraction of an output shaft of the hydraulic cylinder. 2. A lock pin that advances and retreats with respect to the lock pin, wherein when the end of the lock pin is inserted into the pin insertion hole, the tubular body cannot rotate with respect to the pipe body. Anti-rotation tube for excavator. 3. The rotation preventing tube of the excavator according to claim 2, wherein the pin insertion holes are provided on the inner peripheral surface of the cylindrical body at regular angular intervals. 4. A universal joint portion for attaching to a machine is provided on the front side of the pipe body.
4. A rotation prevention tube for an excavator according to any one of 3 to 3.