JPH1150774A - Connecting device for excavating rod in excavator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily expand an excavating rod even in the case of an excavator having a member that may become an obstacle, such as a soil-discharge hopper, below a drive. SOLUTION: This device includes an intermediate rod 10 connected to and hanging down from the output shaft of a drive part which is free to rise and fall along a tower, a control rod 24 non-rotatably and axially slidably inserted into the intermediate rod 10, and an excavating-rodconnecting female joint part 25 provided at the lower end of the intermediate rod 10. The female joint part 25 is provided with a lock member 29 which is freely locked in and unlocked from a lock groove in the male joint part of the excavating rod, in such a way that the lock member 29 is free to project and sink radially. The lock member 29 is projected and sunk by an operating mechanism 50 which responds to the moving up and down of the control rod 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavating rod connecting apparatus for excavating a vertical hole by adding a screw auger, a casing auger and other excavating members (hereinafter collectively referred to as excavating rods) in an excavator. About.

[0002]

2. Description of the Related Art Conventionally, as an excavator for performing an excavating operation by adding an excavating rod as described above, for example, Japanese Patent Publication No.
No. 56398 is disclosed. The excavator described in this publication automatically connects the upper end of a drilling rod to an output shaft of a drive unit supported on a tower so as to be able to move up and down.

[0003]

However, as illustrated in FIG. 9, a dumping hopper 3 is provided below the driving unit 1 so that the excavating rod 2 is inserted therethrough. When the device described in the above publication is applied to a so-called digging machine having a structure for discharging digging earth and sand from the lower discharging port 4, when reconnecting the next digging rod after completing the work for one digging rod The connection point between the excavating rod and the drive unit 1 is located above the height of the discharging hopper 3, so that the attachment / detachment work at the connection unit 5 is a work at a high place, and the workability is poor. However, it was difficult to apply the above technology to an excavator having this type of unloading hopper 3.

[0004]

SUMMARY OF THE INVENTION The present invention makes it possible to easily extend a drilling rod even in an excavator having an obstacle such as an unloading hopper at a lower portion of a drive unit. As a means for solving the problem, the present invention provides a connecting device in which a drilling rod is connected to a drive unit that can move up and down along a tower, and the drilling rod is rotated. In an excavator that drills a vertical hole in the ground by driving, a relay rod that is connected to the output shaft of the drive unit and hangs down, and is inserted non-rotatably and axially slidably into the relay rod. Operating rod, and a female joint part for excavating rod connection provided at the lower end of the relay rod. The female joint part has a lock member that can be disengaged from the lock groove of the male joint part of the excavating rod. Appearing and retracting in the radial direction Only, lies in the so infested by actuating mechanism which operates in response to the lock member to the vertical movement of the operating rod.

The operating mechanism includes an operating portion provided at a lower end of the operating rod and actuated portions provided at both ends of a holder having a pair of right and left locking members each having a substantially arc-shape. The actuating portion is located between each actuated portion of the pair of holders, and the actuating portion and the actuated portion move the actuated portion in the separating direction when the actuating portion rises, and the locking member It is preferable to have a cam surface that locks the lock member by moving the operated part in the approaching direction when the operating part descends, in order to make the connecting part compact. .

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings. The embodiment shown in FIG. 1 shows a case where the present invention is applied to an excavator equipped with an earth discharging hopper 3 as shown in FIG. 9 described above, and the same reference numerals are used for members common to FIG. To explain, a lower coupling 8 connected to an output shaft of a drive unit 1 which can move up and down along a tower 7 erected on a base machine 6 of the excavator as shown in FIGS. The upper end of the relay rod 10 is connected and suspended, and a sliding cylinder 11 is fitted around the outer periphery of the upper end of the relay rod 10 so as to be slidable in the vertical direction. The drive unit 1 is suspended by a wire rope 13 passing through a sheave 12 at the upper end of the tower 7, and the wire rope 13 is wound up and down by a winch 14 on the base machine 6. Reference numeral 15 denotes a stay.
Therefore, the excavating rod 2 in FIG. 9 is the relay rod 10 in the present invention.

A holding frame 16 is fitted around bearings 17 and 17 around the outer periphery of the sliding cylinder 11 to rotatably support the sliding cylinder 11. Hydraulic cylinders 18
Are supported non-rotatably by connecting rods 20, 20.

[0010] Engaging pins 21 and 21 are provided on the sliding cylinder 11 at positions symmetrical in the diameter direction and project in the horizontal direction toward the center. The inner ends of the long holes 22, 22 pierced long in the direction, the inner ends of which are the upper ends of the operation rods 24 fitted on the outer periphery of the chemical liquid injection core tube 23 provided at the center position of the relay rod 10. A stroke within the range of the long holes 22, 22 of the relay rod 10 through the sliding cylinder 11 and its engaging pins 21, 21 due to the expansion and contraction of the hydraulic cylinders 18, 18, which is inserted into the bearing portion 24a. The operation rod 24 is moved up and down.

The female joint 25 is provided at the lower end of the relay rod 10 as shown in FIG. 7, and the male joint 26 (the hexagonal shaft in the figure) at the upper end of the excavating rod 2 'to be extended is provided. A fitting hole 27 having the same cross-sectional shape as the male joint part 26 is formed at a predetermined depth from the lower end so that the fitting can be performed as closely as possible.

The female joint 25 has a pair of left and right horizontal locking holes 28, 28 in a flat shape penetrating from the outer periphery to the inner periphery.
Lock members 29, 29 are slidably fitted into the male member 8, respectively, and the inner ends of the lock members 29, 29 are fitted into the fitting holes 27 when they project into the fitting holes 27.
Lock grooves 30, formed at symmetrical positions on the outer peripheral diameter line of
30.

At the lower end position of the operating rod 24, the lock members 29, 29 are responsive to the vertical movement of the rod 24.
There is provided an operating mechanism 50 for locking or unlocking the lock mechanism.

The operating mechanism 50 is provided with the operating rod 24.
Operating member 37 provided at the lower end of the lock member 2
9 and 29, which are fixed to the outer ends of the holders 31, 31 and actuated portions 32, 32 at the ends of the holders 31, 31, respectively.

That is, the outer end of the lock member 29 is provided with the female joint 25 as shown in FIG.
A central position on the inner surface side of a holder 31 having an arc length in the vicinity of a half circumference of the outer periphery is fixedly secured, and both ends of the holder 31 are formed into a substantially parallelogram-shaped actuated part 3 which stands up.
The actuated portion 32 has a tapered upper cam surface 33, a lower cam surface 34 parallel thereto, and a vertical surface 35 connecting the upper ends of the upper cam surface 33 and the lower cam surface 34.
have.

At the lower end of the operating rod 24, FIG.
(A), as shown in FIG. 6 (A), the upper ends of the connecting rods 36, 36 are connected at symmetric positions, and these connecting rods 36, 36 are connected.
Actuating parts 37, 37 are connected to the lower end of 36.

This operating part 37 is provided in FIGS. 5B and 6.
As shown in (B), the lower cam surfaces 34, 3 of the actuated parts 32, 32 of the left and right holders 31, 31 are provided at the lower ends.
4 and the right and left cam surfaces 38, 38 parallel to this.
And both ends have vertical surfaces 35, 35 of the actuated portions 32, 32.
A release actuating portion 39 having a width dimension sufficient to move the inner ends of the lock members 29, 29 to a position at which the inner ends of the lock members 29, 29 can retract within at least the same plane as the inner surface of the fitting hole 27; The upper cam surface 33 of the actuating part 32 has left and right cam surfaces 40, 40 parallel to the upper cam surface 33, and the upper cam surfaces 33, 33 of the left and right driven parts 32, 32 are attracted to each other to hold the holder 31, A connecting operation portion 4 for projecting the lock members 29, 29 into the fitting hole 27 of the female joint portion 25 via the base 31.
The vertical movement of the operating rod 24 causes the operating portions 37 to move up and down between the time of release in FIG. 5B and the time of connection in FIG.

In the drawing, reference numeral 42 denotes a female joint cover for covering the holders 31, 31, the operating portions 37, 37, etc. of the lock members 29, 29.

Next, the operation of the above embodiment will be described. In order to continue the excavation by adding a new excavation rod 2 ′ after excavation by one excavation rod 2, the hydraulic cylinders 18, 18 are shortened from the connected state of FIG. When the operating rod 24 is lifted via 21, the operating portions 37, 37 connected to the lower end thereof are pulled up,
The cam surfaces 38, 38 of the release operation portion 39 at the lower ends of the operation portions 37, 37 hold the holders 31, 3 of the lock members 29, 29.
The holders 31, 31 are evenly pushed laterally by ascending along the lower cam surfaces 34, 34 of the operated portions 32, 32.

As a result, the left and right holders 31, 31 are evenly separated from each other, and when the release operating portion 39 is located between the vertical surfaces 35, 35 of the operated portions 32, 32 as shown in FIG. , 29 are the lock grooves 30, 30 of the male joint 26.
And the lock is released (FIG. 5C).

After that, the drive unit 1 is pulled up, the excavating rod 2 ′ to be extended is hung below the drive unit 1, and then the drive unit 1 is lowered to insert the new excavation rod 2 ′ into the fitting hole 27 of the female joint 25. When the male joint 26 at the upper end is fitted, and the hydraulic cylinders 18 are extended and the operating rod 24 is pushed down, the release operating portions 39, 39 of the operating members 37, 37 are disengaged downward from the vertical surfaces 35, 35. , This time the linking actuator 4
The first cam surfaces 40, 40 are in sliding contact with the upper cam surfaces 33, 33 of the actuated portions 32, 32, through which the actuated portions 32, 32 are interposed.
Lock members 29, 29 enter the fitting holes 27 of the female joint portion 25, and their inner ends engage with the lock grooves 30, 30 of the male joint portion 26 of the excavating rod 2 '. It is locked so that it cannot be pulled out (FIGS. 6B and 6C).

Therefore, the work related to the connection of the excavating rod 2 'can be performed at the lower position of the discharging hopper 3, and the work is performed at a low place, so that the workability is remarkably improved. This is the dumping hopper 3
For example, the present invention can be similarly applied to the case of an excavator having Monken, and the same effect can be obtained.

[0021]

As described above, according to the present invention, even if the excavator is provided with a member such as an unloading hopper at a lower portion of the drive unit, the excavation rod can be added to the unloading hopper. Can be performed at a portion protruding from the lower part of the work, so that the connection and disconnection work is performed at a position lower by the height of the discharging hopper, and the workability is significantly improved and safety can be enhanced.

Further, since the operation rod for connecting and disconnecting the excavation rod is performed by the operation rod inserted into the relay rod, the device including the relay rod can be made slimmer.

Further, since the mechanism for extending and retracting the lock member is built in the relay rod, malfunction does not occur due to intrusion of earth and sand or the like, which can be desirable in terms of maintenance.

Further, if the operating mechanism for performing the connecting operation is configured as in claim 2, the operating part which moves up and down together with the operating rod is located between the operated parts having a position different from the lock member by 90 °. Further slimming of the mechanism can be achieved.

[Brief description of the drawings]

FIG. 1 is an overall side view showing an example of an excavator to which the present invention is applied.

FIG. 2 is a front view of a coupling device according to the present invention.

FIG. 3 is a partially enlarged view showing a main part in section.

FIG. 4 is a view taken in the direction of the arrow A in FIG. 3;

FIG. 5 shows a state when the female joint portion in FIG. 2 is released,
(A) is a longitudinal front view, (B) is a side view thereof, and (C) is a cross-sectional view of FIG.

6A and 6B show a state at the time of connection, wherein FIG. 6A is a longitudinal sectional front view, FIG. 6B is a side view thereof, and FIG. 6C is a sectional view corresponding to FIG.

FIG. 7 is a sectional view showing a state in which a male joint is connected to a female joint.

FIG. 8 is a perspective view showing one of the lock members.

FIGS. 9A and 9B are explanatory diagrams showing a conventional technique.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 drive unit 2, 2 ′ excavating rod 3 earth discharging hopper 7 tower 8 output shaft 10 relay rod 11 sliding cylinder 16 holding frame 18 hydraulic cylinder 20 connecting rod 21 engaging pin 22 long hole 23 core tube 24 operating rod 25 female joint Part 26 Male joint part 27 Fitting hole 28 Lock hole 29 Lock member 30 Lock groove 31 Holder 32 Actuated part 33 Upper cam surface 34 Lower cam surface 35 Vertical surface 37 Actuator 38, 40 Cam surface 39 Release actuator 41 Connection actuation Part 50 Operating mechanism

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Mamoru Hamano 1293, Tento-cho, Hanamigawa-ku, Chiba-shi, Chiba Sanwa Kikai Co., Ltd. Sanwa Kikai Co., Ltd.Chiba Plant

Claims (2)

[Claims] An excavator in which an excavating rod is connected to a drive unit which can move up and down along a tower, and which drills a vertical hole in the ground by rotating the excavation rod. The excavator is connected to an output shaft of the drive unit. A relay rod that is suspended and suspended, an operation rod inserted non-rotatably and axially slidably in the relay rod, and a female joint portion for excavating rod connection provided at a lower end portion of the relay rod. The female joint portion is provided with a lock member which is removably engageable with a lock groove of the male joint portion of the excavation rod so as to be able to protrude and retract in a radial direction thereof, and an actuating mechanism which responds to the vertical movement of the operation rod with the lock member A coupling device for excavating rods in an excavator, characterized in that the excavating rod protrudes and retracts. 2. The operating mechanism according to claim 1, wherein said operating mechanism includes an operating portion provided at a lower end of said operating rod, and actuated portions provided at both ends of a holder having an arc shape substantially integral with a pair of right and left locking members. The operating portion is located between the respective actuated portions of the pair of holders, the actuating portion and the actuated portion move the actuated portion in the separating direction when the actuating portion rises, 2. The excavator rod according to claim 1, further comprising a cam surface that locks the lock member, moves the operated portion in the approaching direction when the operating portion descends, and locks the lock member. Coupling device.