JPH1122360A - Rod connecting device for excavator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of members, to simplify structure, to be manufactured at a low-cost, and besides to connect the upper end square shank of a rod for excavation directly to the rod drive shaft of an excavator. SOLUTION: In a rod connection device, a square hole 13 in which an upper end square shank 1a of a rod 1 is fitted is formed in the lower end part of a rod drive shaft 9 of an excavator elevatably supported at a leader. A chuck claw 15 is provided to be is engaged from a recessed groove 9a of the square shank 1a fitted in the square hole 13 in a state to radially move movably forward to and backward from a recessed groove 9. A chuck claw driving forward and backward means 16 to drive forward and backward to drive forward and backward between a closing position wherein the chuck claw 15 is engaged with the recessed groove 9a of the square shank 1a and a releasing position where the chuck claw is disengaged from the recessed groove 9a is arranged at the outer side of the rod drive shaft 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection device for connecting a screw rod for excavation to an excavator supported by a leader so as to be able to move up and down.

[0002]

2. Description of the Related Art As shown in FIG. 1, an excavator 2 for driving a screw rod 1 for excavation moves up and down on a leader 6 which is vertically held by a crawler type vehicle 3 via a catch hawk 4 and a back stay 5. The excavator is suspended from an excavator lifting wire 8 via a top sheave 7 which is supported so as to be supported at the upper end of the reader 6.

[0003] The excavating screw rod 1
The excavator 2 and the excavator 2 conventionally have a rod connection shaft connected to the upper end of the screw rod 1, and the rod connection shaft is inserted into a shaft hole of the rod drive shaft 9 of the excavator 2, and has a diameter between both ends. The connection has been made by inserting the coupling pin in the direction. However, such a connection method by inserting the coupling pin has the following problems.

That is, when the excavator screw rod 1 is connected to the excavator 2, the excavator lifting wire 8 is used to separate the excavator lifting wire 8 from the upper end of the leader 6 using a hanging wire 10. The connecting pin is inserted in a state where the upper end rod connecting shaft of the screw rod 1 is inserted into the shaft hole of the rod drive shaft 9 of the excavator 2 in which the connecting shaft is lifted up and stands by at a position higher than the upper end of the screw rod 1. Therefore, the worker inserts the connecting pin while climbing to the height of the excavator 2 by using the ladder attached to the leader. Therefore,
In such a connecting pin insertion method, not only a large amount of labor and time is required for the connection work between the excavator 2 and the screw rod 1, but also a great danger is involved because the work is performed at a high place.

[0005] In order to solve the above problems, the present applicant has proposed a rod connecting device as described in Japanese Patent Publication No. 7-42839. According to the device as described in this publication, after inserting the rod connecting shaft coupled to the upper end of the suspended excavating screw rod into the shaft hole in the rod drive shaft of the excavator waiting at a high place, The screw drive rod is slightly rotated by hand if necessary, and the movable claw switching means switches the retaining claw from the retracted position to the operating position, thereby securely connecting the rod drive shaft and the rod connection shaft. It is extremely safe because it does not require a manual operation of inserting a connecting pin at a high place as in the prior art.

[0006]

However, in the rod connecting device described in the above publication, the number of members is large,
Since the structure is extremely complicated, there is a problem that the manufacturing cost is high.

Therefore, the present invention has a small number of members, is simple in structure, can be manufactured at low cost, does not require a rod connecting shaft conventionally used, and connects the upper end corner shaft of a drilling rod to an excavator. An object of the present invention is to provide a rod connecting device of an excavator that can be directly connected to a rod drive shaft.

[0008]

According to a first aspect of the present invention, there is provided a rod connecting device, wherein a lower end portion of a rod drive shaft of an excavator supported by a leader is lifted and lowered. A square hole 13 into which the portion 1a is fitted is provided.
And a chuck claw 15 which moves in and out in the radial direction to engage and disengage with the concave groove 9a of the square shaft portion 1a fitted into the square hole 13 is provided. A chuck claw advance / retreat drive means 16 for advancing / retreating between a closed position engaged with the concave groove 9a and an open position detached from the concave groove is provided on an outer portion of the rod drive shaft 9. .

A second aspect of the present invention is the excavator rod connecting device according to the first aspect, wherein the chuck pawls 15 and the chuck pawl advance / retreat driving means 16 are provided at a plurality of locations around the lower end of the rod drive shaft 9. And

A third aspect of the present invention is the excavator rod connecting device according to the first or second aspect, wherein the chuck pawl advance / retreat driving means 16 comprises a fluid pressure cylinder 19, a piston rod 19 a of the cylinder 19, and the chuck pawl 15. And a toggle joint 20 interposed therebetween.

According to a fourth aspect of the present invention, in the rod connecting device for an excavator according to any one of the first to third aspects, the moving member moves along with the reciprocating movement of the chuck pawl by the operation of the chuck pawl reciprocating driving means. Is provided so that its outer end protrudes out of the slit 25 of the cover body 18 provided on the rod drive shaft 9 and moves along the slit 25, and the outer end protruding portion of the moving member 24 An indicator piece 26 is attached, and display portions 31 and 32 of the open and closed positions indicated by the indicator piece 26 are provided at both end portions of the slit 25 corresponding to the closed position and the open position of the chuck claw 15, respectively. It is characterized by the following.

According to a fifth aspect of the present invention, in the rod connecting device for an excavator according to the fourth aspect, the moving member 24 is interlockingly connected to a connecting portion between the fluid pressure cylinder 19 and the toggle joint 20. .

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rod connection device according to the present invention will be described below with reference to FIGS. As shown in FIG. 1, a rod drive shaft 9 projecting downward from the lower end of the excavator 2 is, as shown in FIG. 2, connected to a drive main shaft 11 and a connecting shaft concentrically flange-connected to the lower end of the drive main shaft 11. At the lower end of the connecting shaft 12, there is provided a square hole 13 into which the upper-end square shaft 1a of the excavating screw rod 1 (digging rod) is fitted. The upper end angular shaft portion 1a of the screw rod 1 is formed in a hexagonal cross section as shown in the figure, and concave grooves 9a, 9a having a semicircular cross section are provided on a pair of opposed outer surfaces in a direction orthogonal to the axial direction. Have been. Incidentally, the upper end corner shaft portion 1a may be formed in a quadrangular or octagonal cross section. Further, the concave groove 9a may be formed so as to be continuous in all the side surfaces of the square shaft portion 9 in the circumferential direction. The concave groove 9a does not need to be specially formed, and the concave groove for pin insertion formed in the upper end corner shaft portion 1a of the ready-made excavation screw rod 1 can be used as it is.

As shown in FIGS. 2 and 3, a pair of openings 14, 14 are provided at the lower end of the connection shaft 12 at symmetric positions in the diameter direction of the square hole 13. ,
14 is provided with a concave groove 9 of the upper end angular shaft portion 1a that moves radially with respect to the square hole 13 and is fitted into the square hole 13.
a, a pair of chuck claws 15, 1 on both sides engaging and disengaging with respect to 9a.
5 is slidably fitted, and an engagement claw 15a having a semicircular cross section capable of engaging with the concave groove 9a of the upper end angular shaft portion 1a is protruded from an inner end of each chuck claw 15. I have.

In FIGS. 2 and 3, reference numeral 16 denotes each of the chuck claws 15 inserted into the opening 14 and
A chuck claw advance / retreat drive means for advancing / retreating between a closed position engaged with the concave groove 9a and an open position detached from the concave groove 9a, and is provided on the outer portion of the connection shaft body 12. Reference numeral 17 denotes a frame fixed to the lower end of the connection shaft 12, and 18 is provided so as to cover the periphery of the connection shaft 12 over the frame 18 and the upper end of the connection shaft 12. Cover body. The chuck pawl 15 and the chuck pawl advance / retreat driving means 16 for driving the chuck pawl 15 are provided in a pair at symmetric positions on both sides in the diameter direction of the connection shaft 12.

The structure of each chuck pawl advance / retreat driving means 16 will be described in detail.
6 is a hydraulic cylinder 19 disposed in the cover 18 substantially in parallel with the rod drive shaft 9;
9 and a toggle joint 20 interposed between an outer end of the chuck claw 15 and the piston rod 19a. The cylinder body 19b of the hydraulic cylinder 19
It is pivotally attached to a bracket 21 attached to the connection shaft 12. The toggle joint 20 has two links 22 and 23 pivotally connected to each other. One end of one link 22 is pivotally connected to the frame 17 side, and one end of the other link 23 is outside the chuck pawl 15. The piston rod 19a of the hydraulic cylinder 19 is pivotally connected to the end of the hydraulic cylinder 19 at the connection between the links 22 and 23.

Although the hydraulic piping of the hydraulic cylinder 19 in the chuck pawl advance / retreat driving means 16 is not shown, a pair of oil flow paths on both sides are provided inside the rod drive shaft 9 along the axial direction. The lower end of the flow path is connected to the push-side oil chamber of each hydraulic cylinder 19, and the lower end of the other oil path is connected to the pull-side oil chamber of each hydraulic cylinder 19 via a hydraulic hose. Side is connected to a hydraulic supply / discharge port on the excavator body side via a well-known swivel mechanism.

According to the chuck pawl advance / retreat driving means 16 having the above structure, as shown on the right side of FIG. 2, when the hydraulic cylinder 19 contracts, the connecting portion between the two links 22 and 23 in the toggle joint 20 is pulled up. As a result, the chuck claw 15 moves backward with respect to the square hole 13, and the concave groove 9 a of the upper end angular shaft portion 1 a fitted in the square hole 13.
Is opened. The hydraulic cylinder 19 extends from this open position, and as shown on the left side of FIG.
When the connecting portion of the two links 22 and 23 is pushed down, the chuck claw 15 moves into the square hole 13 and the engaging claw 15a engages with the concave groove 9a of the upper end angular shaft portion 1a. In the closed position, the excavating screw rod 1 is
Will be connected.

FIG. 2 shows a state in which one chuck claw 15 is in the closed position and the other chuck claw 15 is in the open position. In practice, both chuck pawl advance / retreat driving means 16, 16 are opened so that both chuck jaws 15, 15 are simultaneously opened and closed simultaneously.
Shall be activated.

As schematically shown in phantom lines in FIG. 2, a moving member 24 that moves with the movement of each chuck claw 15 by the operation of each chuck claw advance / retreat driving means 16 has an outer end whose cover is covered with the cover. The moving member 24 is provided so as to protrude outward from the slit 25 provided on the body 18 and move along the slit 25, and the indicator 2
6 is attached, and at both end portions of the slit 25 corresponding to the closed position and the open position of the chuck claw 15, respectively,
A display section for both the open and closed positions indicated by the indicating piece 26 is provided so that it can be confirmed whether the chuck pawl 15 is in the closed position or the open position.

More specifically, as shown in FIG. 4A, one end of a link member 28 is pivotally connected to a connecting pin 27 of both links 22 and 23 in each toggle joint 20. The other end of the connecting pin 2
7 is pivotally attached to an inner end of a moving member 24 arranged in parallel with the moving member 7, and an outer end of the moving member 24 is projected outward from a vertically extending slit 25 provided on the cover body 18. Along the gap between the upper and lower ends of the slit 25. The length of the slit 25 is substantially the same as the vertical stroke of the connecting pin 27. Then, as shown in FIG. 4 (B), the letter “open” 31 is provided on the outer surface of the cover body 18 at the same level as the upper limit position of the moving member 24, and “open” is displayed at the same level as the lower limit position of the moving member 24. The characters 32 of "closed" are displayed, and these characters, that is, the display portions 31 and 32, are indicated by the indicating piece 26 attached to the outer end protruding portion of the moving member 24. The display units 31 and 32 may be symbols other than characters.

Therefore, when each chuck claw 15 is at the open position, the indicating piece 26 indicates the character "open", and when each chuck claw 15 is at the closing position, the indicating piece 26 indicates "open". Since the word "closed" is specified, the chuck pawl 15
It can be easily confirmed from the outside whether the device is in the closed position or the open position. When the indicating piece 26 points to an intermediate position between the characters “open” and “closed”, the engaging claw 15a of the chuck claw 15 It indicates that the chuck claw advance / retreat drive means 16 is inoperable, for example, the groove 9a of the upper end angular shaft portion 1a of the screw rod 1 is shifted in the circumferential direction or the hydraulic cylinder 19 is malfunctioning. Therefore, such a situation can be dealt with promptly.

As shown in FIG. 1, when the excavating screw rod 1 is connected to the excavating machine 2, first, the upper end of the screw rod 1 is lifted up by a hanging wire 10 by a method similar to the conventional method, so that a predetermined height is reached. Then, the upper end angular shaft portion 1a of the screw rod 1 is inserted into the square hole 13 of the rod drive shaft 9 of the excavator 2 which is waiting, and each chuck claw 15 is moved to the closed position by each chuck claw advance / retreat driving means 16. By actuating the screw rod 1 quickly and easily
Can be connected to the rod drive shaft 9.

When the above-mentioned chuck claw advance / retreat driving means 16 is operated, when the engaging claw portion 15a of the chuck claw 15 and the concave groove 9a of the upper end angular shaft portion 1a are displaced in the circumferential direction,
Since the indicating piece 26 indicates an intermediate position between the characters "open" and "closed", in that case, the chuck claw 15 is returned to the open position, and the upper end angular shaft portion 1a is moved to the rod driving shaft 9
Once the screw rod 1 for excavation is manually pulled out from the square hole 13 and the excavation screw rod 1 is manually rotated by 45 ° to 90 °, the upper end angular shaft portion 1a is inserted into the square hole 13 of the rod drive shaft 9 again, and the chuck claw advances and retreats. The driving means 16 may be operated to close the chuck pawl 15. In this embodiment, since the screw rod 1 has the pair of concave grooves 9a, 9a on both sides in the upper end angular shaft portion 1a, the above positional deviation may occur. When a concave groove is formed in the circumference, there is no problem of displacement.

When the screw rod 1 for excavation and the rod drive shaft 9 of the excavator 2 are connected as described above, the screw rod 1 is driven to rotate by the rod drive shaft 9 to perform the conventional excavation work. Can be made. In this case, since the rod drive shaft 9 is provided with the flow path 29,
Through this flow path 29 and the flow path in the screw rod 1, various kinds of milk can be supplied and discharged from the ground side to the tip of the screw rod 1. As shown in FIG. 2, a watertight packing 30 is provided inside the square hole 13 of the rod drive shaft 9.

When the screw rod 1 is to be removed from the rod drive shaft 9 after the operation, each of the chuck claw advance / retreat driving means 16 is operated while the hanging wire 10 is connected to the upper end of the screw rod 1 to operate each of the chuck claws 15. , The screw rod 1 is suspended and the upper end angular shaft portion 1a is detached from the square hole 13 of the rod drive shaft 9.

In this embodiment, a pair of chuck pawls 15 and chuck pawl advance / retreat driving means 16 are provided at symmetrical positions on both sides of the lower end of the rod drive shaft 9, but they may be provided at one place or at two or more places around. You may. Further, the fluid pressure cylinder of the chuck pawl advance / retreat driving means 16 is not limited to a hydraulic cylinder, but may be an air cylinder. Further, as the chuck pawl advance / retreat driving means 16, in addition to being constituted by a fluid pressure cylinder and a toggle joint, a fluid pressure cylinder may be directly connected to the chuck pawl 15 in an interlocking manner.

[0028]

According to the rod connecting device of the first aspect, the concave groove at the upper end angular shaft portion of the excavating rod moves in the radial direction with respect to the square hole provided at the lower end portion of the rod drive shaft of the excavator. And a chuck claw reciprocating drive means for driving the chuck claw forward and backward between a closed position where the chuck claw is engaged with the concave groove of the square shaft portion and an open position detached therefrom. It is provided on the outer side of the shaft, and the upper end angular shaft portion of the suspended excavating rod is inserted into the square hole of the rod drive shaft of the excavator waiting at a high place, and the chuck jaws are driven by chuck jaw advance / retreat driving means. By operating the rod in the closed position, the excavating rod can be quickly and easily connected to the rod drive shaft, and the number of members is smaller than that of the conventional rod connecting device, the structure is simple, and the rod used in the past is used. Connection Because there is not necessary, can be directly engaging the chuck jaws in the groove by utilizing the groove for pin insertion which is provided on the upper angle shank of the drill rod, easy manufacture,
The cost can be significantly reduced.

By providing the chuck pawl and the chuck pawl advance / retreat driving means at a plurality of locations around the lower end of the rod drive shaft, the rod drive shaft and the excavating rod can be more securely and firmly connected. it can.

According to a third aspect of the present invention, if the chuck claw advance / retreat driving means is constituted by a fluid pressure cylinder and a toggle joint interposed between the piston rod of this cylinder and the chuck claw, a relatively small fluid pressure Since a large driving force can be obtained by the cylinder and the fluid pressure cylinder can be disposed in parallel with the rod drive shaft, the chuck pawl advance / retreat driving means can be configured to be small and compact.

According to the fourth aspect, whether the chuck pawl is in the closed position or the open position can be easily confirmed from the outside, and malfunction of the chuck pawl advance / retreat driving means can be detected. We can deal with it promptly.

The moving member to which the indicator is attached is linked to the connecting portion between the fluid pressure cylinder and the toggle joint, so that the moving member can be moved in the up and down direction. Can be displayed in a vertical positional relationship, so that the display unit is easy to see.

[Brief description of the drawings]

FIG. 1 is a side view showing a use state of an excavator and a rod for excavation.

FIG. 2 is a longitudinal sectional front view showing a rod connecting device according to the present invention.

3 (A) is a half cross-sectional side view of the rod connecting device of FIG. 2, and FIG. 3 (B) is a cross-sectional view taken along the X-ray of FIG.

4A is an enlarged cross-sectional view taken along a line Y in FIG. 2, and FIG. 4B is a drawing viewed from an arrow Z direction in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Excavation rod 1a Upper-end corner shaft part 2 Excavator 9 Rod drive shaft 9a Depressed groove 13 Square hole 14 Opening part 15 Chuck claw 15a Engagement claw part 16 Chuck claw advance / retreat drive means 17 Frame 18 Cover body 19 Hydraulic cylinder (fluid pressure) Cylinder) 20 Toggle joint 24 Moving member 25 Slit 26 Indicator piece

Claims (5)

[Claims] An excavator, which is supported by a leader so as to be able to ascend and descend, has a square hole into which a top corner shaft of an excavating rod is fitted, and a radial hole with respect to the square hole. A chuck claw that moves and engages and disengages from the groove of the square shaft portion fitted into the square hole is provided, and the chuck claw is engaged with the groove of the square shaft portion from the closed position and the groove. A rod connection device for an excavator, comprising: a chuck claw advance / retreat drive means for advancing / retreating an open / close position for detachment provided on an outer portion of the rod drive shaft. 2. The rod connecting device for an excavator according to claim 1, wherein the chuck jaws and chuck jaw advance / retreat driving means are provided at a plurality of locations around a lower end of the rod drive shaft. 3. The excavator according to claim 1, wherein the chuck pawl advance / retreat driving means comprises a fluid pressure cylinder and a toggle joint interposed between the piston rod of the cylinder and the chuck pawl. Rod connecting device. 4. A moving member which moves as the chuck pawl advances and retreats due to the operation of the chuck pawl reciprocating drive means, wherein an outer end of the moving member projects outward from a slit of a cover body provided on the rod drive shaft. In addition to being provided so as to move along the slit, an indicator piece is attached to the outer end protruding portion of the moving member, and the indicator piece is provided at both end portions of the slit corresponding to the closed position and the open position of the chuck claw, respectively. The rod connecting device for an excavator according to any one of claims 1 to 3, further comprising a display unit for displaying both the open and closed positions. 5. The rod connecting device for an excavator according to claim 4, wherein the moving member is operatively connected to a connecting portion between the fluid pressure cylinder and the toggle joint.