JPH07113316B2 - Excavator rod connecting device - Google Patents

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art An excavator 2 for driving a screw rod 1 for excavation as shown in FIG. 1 can be lifted and lowered by a leader 6 which is vertically held by a crawler type vehicle 3 through a catch hawk 4 and a backstay 5. And is suspended from an excavator hoisting wire 8 via a top sheave 7 that is supported on the upper end of a leader 6.

In the excavating screw rod 1 and the excavator 2, the rod connecting shaft 9 connected to the upper end of the screw rod 1 is connected to the rod driving shaft 10 of the excavating machine 2.
In the state of being inserted into the shaft hole, the connection was made by inserting the connecting pin in the diametrical direction between them, but the connection system by inserting such a connecting pin had the following problems.

[0004]

When the excavating screw rod 1 is connected to the excavator 2, a suspending wire 11 suspended from the upper end of the leader 6 is used in addition to the excavator suspending wire 8. Then, the upper end portion (rod connecting shaft 9) of the screw rod 1 is lifted, and the screw rod is inserted into the shaft hole of the rod drive shaft 10 in the excavator 2 which is made to stand by at a position higher than the upper end of the screw rod 1. Since the connecting pin is inserted with the upper end rod connecting shaft 9 of No. 1 being inserted, the worker carries out the connecting pin inserting work while climbing to the height of the excavator 2 using the ladder attached to the leader. It will be.

Therefore, in the conventional coupling pin insertion method,
Not only does it take a lot of time and effort to connect the excavator to the screw rod, but it is also a great risk because the work is done at a high place.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, the present invention provides a rod drive shaft of an excavator supported by a leader so that the rod drive shaft can be moved up and down. On the other hand, a movable retaining pawl that is capable of swinging in the radial direction is attached, and a movable pawl switching that switches the movable pawl between an operating position in which it projects into the shaft hole and a retracted position in which it retracts outside the rod connecting hole. means juxtaposed, the rod connecting shaft to the shaft hole to allow a relative rotation fitted only axial insertion and removal of the rod drive shaft, recess in which the locking movable pawl omission is fitted is provided, the Movable claw for retaining is rod drive
The movable claw is pivotally supported at a plurality of places around the moving shaft and is movable.
Switching means urges the movable claws toward the retracted position.
The spring and the drive shaft are loosely fitted so that they can move up and down and
Position of each movable claw against the spring when descending
One lifting cylinder that swings to
A rod connecting device for an excavator, which is composed of a moving cylinder , is proposed.

[0007]

[0008]

According to the rod connecting device of the excavator according to the present invention, the rod connecting shaft is attached to the upper end of the excavating screw rod, and the screw rod is hoisted by the hoisting method similar to the conventional one to connect the rod. The shaft is inserted into the shaft hole of the rod drive shaft of the excavator that stands by at a predetermined height.

When the rod connecting shaft is inserted into the shaft hole of the rod drive shaft to a predetermined depth, the movable claw switching means switches the slip-off preventing movable claw from the retracted position to the operating position to move the movable claw to the rod. By fitting into the recess on the connection shaft side, the connection between the rod connection shaft on the excavating screw rod side and the rod drive shaft on the excavator side is completed.

In the connected state of the two, the axial relative movement of the rod drive shaft and the rod connection shaft is blocked by the retaining movable claw, and the rotational force is transmitted from the rod drive shaft to the rod connection shaft. Since the shaft hole on the rod drive shaft side and the rod connecting shaft are fitted so that they can only be inserted and removed in the axial direction and cannot rotate relative to each other, the connection is strongly performed through the fitting surfaces of both.

Further , according to the present invention, although the rod connecting shaft can be strongly locked by the plurality of retaining claws in the circumferential direction, one lifting cylinder is vertically driven by the cylinder. Only with this, a plurality of the movable claws can be simultaneously switched to the working position or the retracted position.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
It will be described based on. As shown in FIGS. 2 to 4, the rod drive shaft 10 protruding downward from the lower end of the excavator 2 includes a drive shaft upper portion 13 concentrically flange-connected to the lower end of the drive main shaft 12, and the drive shaft upper portion 13 A shaft hole 1 for connecting a rod, which is composed of a drive shaft lower portion 14 flange-connected to
5 is concentrically provided on the lower portion 14 of the drive shaft.
Further, around the lower portion 14 of the drive shaft, disengageable movable claws 16A to 16C are arranged at three locations at equal intervals in the circumferential direction.

Movable claws 16A to 16C for retaining each of the above
Is an L-shaped one having a locking action portion 16a capable of penetrating through the radial through window 17 formed in the peripheral wall of the drive shaft lower portion 14 and projecting into the shaft hole 15, and the upper end portion thereof is Between a pair of bearing plates 18 projectingly provided on the peripheral wall of the drive shaft lower portion 14 so as to be swingable by a horizontal support shaft 19, and between the lower side portion of the engaging portion 16a and the bearing plate 18. The tension springs 20 suspended on the
a is biased toward the retracted position P1 where it escapes from the shaft hole 15.

Reference numeral 21 denotes a movable claw switching means, which is one elevating cylinder 22 externally fitted to the rod drive shaft 10 so that it can be moved up and down by using the drive shaft upper portion 13 as a guide, and a rotary bearing on the elevating cylinder 22. An annular body 24 that is externally fitted only through relative rotation via 23, two hydraulic cylinders 25 that are interposed between two locations in the diameter direction of the annular body 24 and the casing 2a of the excavator 2, and It is composed of the tension spring 20. Then, as shown in FIG. 7, the movable cylinders 25 are lowered by the cylinder 25 to the lower limit position where they are brought into contact with the stopper portion 18a of the bearing plate 18, so that the movable locking pawls 16A to 16C are pulled. It is pressed inward against the spring 20 and swings, and the locking action portion 1
Operation position P in which 6a projects from the through window 17 into the shaft hole 15
Switched to 2.

The drive main shaft 12 and the drive shaft upper portion 13 are
Passages for guiding various milks supplied from the ground side into the screw rod 1 for excavation are concentrically provided, and in the drive shaft upper portion 13, a flow path 28 in the drive shaft upper portion 13 is provided.
A normally closed valve means 29 is provided for opening and closing the lower end opening 28a. The normally closed valve means 29 includes a lift valve shaft 31 having a valve body 30 for opening and closing the lower end opening 28a, and the lift valve shaft 3
It is composed of a valve casing 32 that guides the elevator 1 up and down, and a compression spring 33 that biases the elevator valve shaft 31 downward.
A flow passage opening 34 is formed in the peripheral wall of the valve box 32, a push-up operated shaft 35 projects from the lower end of the valve body 30, and a liquid-sealing annular ring surrounds the lower end opening 28a. Packing 36 is attached.

As shown in FIGS. 2 and 3, the shaft hole 15 of the lower drive shaft 14 has a polygonal cross section, and the rod connecting shaft 9 inserted into the shaft hole 15 is shown in FIG.
Also, as shown in FIG. 6, a lower end portion 39 having a square hole 37 into which the upper end angular shaft portion of the screw rod 1 is fitted and a pin hole 38 of a connecting pin for fixing the upper end angular shaft portion of the screw rod 1 And a polygonal prismatic insertion shaft portion 40 that can be inserted into and removed from the shaft hole 15 but cannot rotate relative to the shaft hole 15. The insertion shaft portion 40 has a base portion under the drive shaft lower portion 14. An upward cross section 41 that abuts the end face is formed. Further, the insertion shaft portion 40 is formed with a circumferential annular recess 42 into which the retaining claws 16A to 16C are fitted, and a distal end tapered portion 43. The distal end tapered portion 43 is formed.
Concentric with the square hole 37 from the tip end surface of the through-flow passage 4
4 is formed, and an operation member 45 for pushing up the push-up operated shaft 35 of the valve body 30 is diametrically installed in the distal end opening portion of the through flow passage 44 so as not to close the flow passage 44. Has been done.

When the excavating screw rod 1 is connected to the excavator 2 as shown in FIG. 1, the square hole 37 of the rod connecting shaft 9 and the connecting pin inserted into the pin hole 38 shown in FIG. 5 are used. The rod connecting shaft 9 is concentrically connected to the upper end of the excavating screw rod 1. A shaft hole in the rod drive shaft 10 (driving shaft lower portion 14) of the excavator 2 in which the upper end of the screw rod 1 is lifted by the hanging wire 11 and is made to stand by at a predetermined height by a method similar to the conventional method. 15 is an insertion shaft portion 40 of the rod connecting shaft 9.
Is inserted while rotating the screw rod 1 by hand if necessary so that the two can be fitted together. At this time, as shown in FIG. 2, the elevating cylinder 22 is at the upper limit position, and the movable retaining pawls 16A to 16C are switched to the retracted position P1 by the tension spring 20.

As shown in FIG. 7, if the insertion shaft portion 40 is inserted into the shaft hole 15 to a depth where the upward cross section 41 of the rod connecting shaft 9 is adjacent to the lower end surface of the drive shaft lower portion 14, the hydraulic cylinder. 25, the elevating cylinder 22 is lowered to the lower limit where the lower end of the elevating cylinder 22 contacts the stopper portion 18a of the bearing plate 18. As a result, the lifting cylinder 2
2 is a spring 2 with movable retainer pawls 16A to 16C.
The movable claws 16A to
16C is switched from the retracted position P1 to the operating position P2, and its locking action portion 16a is fitted into the annular recess 42 in the insertion shaft portion 40 of the rod connecting shaft 9 via the through window 17, and The rod connecting shaft 9 is pushed upward through the downward step surface 42a of the annular recess 42, and the distal annular surface of the distal end constricted portion 43 of the rod connecting shaft 9 is brought into pressure contact with the liquid sealing annular packing 36.

On the other hand, the insertion shaft portion 4 of the rod connecting shaft 9
The operating member 45 at the tip of 0 pushes up the operated shaft 35 for pushing up the valve body 30 and moves the valve body 30 upward against the spring 33, so that the lower end opening 28a of the flow passage 28 in the drive shaft upper portion 13 is opened. Is opened. Therefore, the flow passage 28 in the drive shaft upper portion 13 and the flow passage 44 in the rod connecting shaft 9 communicate with each other, and liquid leakage between the flow passages 28 and 44 is prevented by the annular packing 36 for liquid sealing.
Is prevented by.

When the excavating screw rod 1 and the rod drive shaft 10 of the excavator 2 are connected as described above, the screw rod 1 is rotationally driven by the rod drive shaft 10 to perform conventional excavation work. It can be done. The rotational force of the rod drive shaft 10 (driving shaft lower portion 14) at this time is strongly transmitted to the rod connecting shaft 9 through the fitting surface between the shaft hole 15 having a polygonal sectional shape and the polygonal columnar insertion shaft portion 40. To be done.

Further, since the annular body 24 connected to the excavator casing 2a via the cylinder 25 and the elevating cylinder 22 are relatively rotatably coupled, the elevating cylinder 22 is integrated with the rod drive shaft 10. The movable claws 16 </ b> A to 16 </ b> C and the elevating and lowering cylinder 22 are prevented from sliding in the circumferential direction. Also, if necessary, the rod drive shaft 10
It is also possible to supply various kinds of milk from the ground side to the tip end of the screw rod 1 through the flow path 28 in the rod connecting shaft 9 and the flow path in the screw rod 1 so as to supply and discharge the milk from the ground side.

After the work, when the rod connecting shaft 9 is detached from the rod driving shaft 10 and separated and the screw rod 1 is detached from the excavator 2, the movable claw is switched with the suspending wire 11 connected to the upper end of the screw rod 1. The elevating cylinder 22 of the means 21 is lifted, and thus each of the retaining claws 16A for retaining
16C is switched from the operating position P2 shown in FIG. 7 to the retracted position P1 shown in FIG. 2, the screw rod 1 is hung, and the insertion shaft portion 40 of the rod connecting shaft 9 is moved to the rod drive shaft 1.
It suffices to disengage from the shaft hole 15 of 0. At this time, the valve body 30 of the normally closed valve means 29 descends by the urging force of the spring 33 and automatically closes the lower end opening 28a of the flow path 28.
Various milk accumulated in the flow passages 28 of the drive main shaft 12 and the drive shaft upper portion 13 does not flow down from the rod drive shaft 10.

In the embodiment, each of the three retaining claws 16A to 16C is provided, but the number thereof is not limited. Further, the structure of the movable claw switching means 21 is not limited to that of the embodiment, and if various milk supply paths are not required,
The normally closed valve means 29 can also be omitted. Further, an annular recess 42 continuous in the circumferential direction is provided as a recess into which the retaining claws 16A to 16C fit, but the shaft hole 15 on the rod drive shaft 10 side and the insertion shaft 40 on the rod connecting shaft 9 side are provided. Since they are fitted so that they cannot rotate relative to each other,
The recesses into which 6A to 16C are fitted need not be continuous in the circumferential direction.

[0024]

As described above, according to the rod connecting device of the excavator of the present invention, the rod connecting shaft connected to the upper end of the hoisting excavating screw rod is manually operated if necessary. While rotating a little, after inserting it into the shaft hole in the rod drive shaft of the excavator standing by at a high place, simply switch the retainer movable pawl from the retracted position to the working position by the movable pawl switching means. The rod drive shaft and the rod connecting shaft can be reliably connected, and the manual connecting pin inserting work at a high place unlike the prior art is not required, so the labor and time required for the rod connecting work can be saved. Not only that, but the safety is greatly improved.

Further, it is not necessary to provide any special means for transmitting the rotational force from the rod drive shaft side to the rod connection shaft side, and even if the transmission torque is large, the fitting between the shaft hole on the rod drive shaft side and the rod connection is possible. Power can be transmitted securely and reliably via the face-to-face contact. Furthermore, according to the present invention, a plurality of punches in the circumferential direction are provided.
The rod connecting shaft can be firmly locked by the movable claws for locking.
Despite being able to
Simply move up and down with to move multiple movable claws at the same time.
Since it can be switched to the working position or the retracted position,
The configuration is simple and the switching operation is easy.

[Brief description of drawings]

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

FIG. 2 shows a rod drive shaft according to an embodiment of the present invention,
FIG. 3 is a vertical cross-sectional side view showing the right side of the paper as the upper side and the left side as the lower side.

FIG. 3 is a bottom view of the rod drive shaft.

FIG. 4 is a sectional view taken along line AA of FIG.

FIG. 5 shows a rod connecting shaft according to an embodiment of the present invention,
The partial vertical side view shown in the direction where the right side of the paper surface is the top and the left side is the bottom.

FIG. 6 is a plan view of the rod connecting shaft.

FIG. 7 is a vertical cross-sectional side view showing a connection state of the rod drive shaft and a rod connection shaft in the above direction.

8 is a cross-sectional view taken along line BB of FIG. DESCRIPTION OF SYMBOLS 1 ... Screw rod for excavation 2 ... Excavator 6 ... Leader 9 ... Rod connection shaft 10 ... Rod drive shaft 13 ... Drive shaft upper part 14 ... Drive shaft lower part 15 ... Connection shaft hole 16A-16C ... Movable claw for retaining. 20 ... Tension spring 21 ... Movable claw switching means 22 ... Elevating cylinder 24 ... Annular body 25 ... Hydraulic cylinder 33 ... Compression springs 28, 44 ... Flow path 29 ... Normally closed valve means 30 ... Valve body 35 ... Pushed operated shaft 36 ... Liquid-sealing packing 40 ... Insertion shaft 42 ... Annular recess 45 ... Operation member

Claims (1)

[Claims] 1. A movable retaining pawl, which is movable in a radial direction with respect to a shaft hole of the rod driving shaft, is attached to a rod driving shaft of an excavator supported by a leader so as to be movable up and down. Movable claw switching means for switching the claw between the working position projecting into the shaft hole and the retracted position retracting to the outside of the rod connecting hole is provided side by side, and only axial insertion / removal with respect to the shaft hole of the rod drive shaft is possible. The rod connecting shaft fitted so as to be relatively non-rotatable is provided with a recess into which the slip- off preventing movable pawl is fitted.
The movable pawl switching means is pivotally supported at a position, and
A spring that urges each movable claw toward the retracted position,
It is loosely fitted to the drive shaft so that it can move up and down
One that swings the moving claw to the working position against the spring.
And two lifting cylinders and a cylinder that drives the lifting cylinders up and down.
-Excavator rod connecting device composed of