JPH0720232Y2 - Excavator rotary table connection mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention is used in an excavator having a bucket that is replaceably attached to the lower end of a kelly bar that is rotationally driven by a rotating member, and is a relay device for operating the bucket. The present invention relates to a rotary table coupling mechanism of an excavator that transmits rotary drive of a rotary member to a rotary table that includes such components.

[Prior Art] Conventionally, there has been known an excavator in which a bottom excavation bucket and a bottom expansion bucket can be exchanged at the lower end of a kelly bar. First, a straight hole is excavated by the bottom excavation bucket and then the bottom expansion bucket is replaced. , The bottom expanding blade of the bottom expanding bucket is expanded to expand the bottom of the straight hole. This type of excavator is equipped with a rotary table, on which hydraulic equipment such as a hose reel wound with a hydraulic hose for supplying hydraulic oil used for expanding the bottom expanding blades of the bottom expanding bucket and a cord are wound. It is equipped with a cord reel and the like (Japanese Utility Model Publication No. 2-54888). Then, this rotary table was attached to a rotary member of a drive device for rotating the kelly bar using a connecting bolt or the like. When the rotary member is rotationally driven, the rotary table rotates together with the kelly bar, and the bottom expanding bucket and the rotary table rotate together, so that the hydraulic hose is prevented from winding around the kelly bar when excavating the bottom with the bottom expanding bucket. .

[Problems to be Solved by the Invention] However, in such a conventional excavating device, when the unsealed bucket is used, the equipment on the rotary table is not used, but it is troublesome to remove the connecting bolt and remove the rotary table each time. On the other hand, when the rotary table is used with the rotary table attached, when the rotary member is rotated to rotate the kelly bar, the rotary table also rotates together with the rotary table. In particular, when a straight hole is excavated using a bare moat bucket, the rotation speed is high, and a large torque is applied to the connecting bolt due to the weight of the rotary table and the equipment mounted on the rotary table. In addition, since the operation time is long and the operation is rough and the unground bucket often moves while the rotation center swings, the bending load is applied to the connecting bolt. Due to these effects, the connection bolts and the like are loosened, and the wear of the sliding surface such as the oil seal is accelerated.

Therefore, the present invention aims to solve the above problems,
An object of the present invention is to provide a rotary table connecting mechanism for an excavator that does not require removal of the rotary table when exchanging a bucket.

[Means for Solving the Problem] In order to achieve such an object, the present invention has the following configuration as a means for solving the problem. That is, by rotating and driving a rotating member of a drive device provided in the fixed part, the kerry bar that moves up and down while rotating at the same center of rotation as the rotating member, and a bucket that is replaceably attached to the lower end of the kerry bar are provided. In the excavator, a rotary table rotatably supported at the same center of rotation as the rotary member is arranged in the fixed portion, and a rotary member is provided with a connecting member capable of transmitting and blocking rotation of the rotary member to and from the rotary table. That is the structure of the rotary table connecting mechanism of the excavating device.

[Operation] In the rotary table coupling mechanism of the excavator of the present invention having the above configuration, when the rotation of the rotary member of the driving device provided in the fixed portion is transmitted to the rotary table by the coupling member, the rotary table becomes the same as the rotary member. It rotates at the center of rotation and rotates with the bucket attached to the kerry bar. On the other hand, when the rotation of the rotary member of the drive device provided in the fixed portion is blocked from being transmitted to the rotary table by the connecting member, the rotary table does not rotate and only the bucket rotates.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a sectional view showing a rotary table connecting mechanism of an excavator according to an embodiment of the present invention. This excavator is the second
As shown in the figure, a boom 2 mounted on a self-propelled body 1
The winch 6 is attached to the sheave 4 rotatably supported at the tip of the
The wire rope 8 that is fed out or wound up by the
The swivel joint 12 is rotatably suspended from the swivel joint 12, and the winch 6 is driven to move the kerry bar 10 up and down. The kelly bar 10 has a cylindrical shape, and a plurality of keys (not shown) are formed on the outer circumference thereof along the axial direction. In addition, the housing 17 of the drive device 16 is provided at the tip of the arm-shaped fixing portion 14 supported by the boom 2.
Is fixed.

As shown in FIG. 1, the drive unit 16 includes a hydraulic motor 22 driven by hydraulic oil supplied from a hydraulic unit (not shown) provided in the main body 1 via a hydraulic hose 20.
Is equipped with. Then, by driving the hydraulic motor 22, the pinion rotatably supported by the bearing 18 is supported.
The 24 can be driven to rotate. Further, the rotating member 26 in which the gear portion 23 that meshes with the pinion 24 is formed,
It is supported by a bearing 25 so as to be rotatable and not to move in the axial direction. Further, at the center of rotation of the rotating member 26, there is a sliding hole 27 in which the kelly bar 10 can slide in the axial direction thereof.
Are formed. The sliding hole 27 has a plurality of key grooves (not shown) with which the keys of the kerry bar 10 engage, on the inner circumference thereof. Then, the kerry bar 10 is inserted into the sliding hole 27 by engaging the key with the key groove.

The kelly bar 10 is equipped with a cylindrical connecting pipe 28 through which the kelly bar 10 is inserted and slidable. The connecting pipe 28 is an intermediate member 36 fixed to a rotating member 26 with a connecting bolt 35. It is fixed with a connecting bolt 37. A rotary joint 30 is arranged outside the connecting pipe 28, and a support member 32 of the rotary joint 30 is fixed to a housing 17 of the drive unit 16. Then, inside the cylindrical casing 33 fixed to the support member 32, a rotor 38 is rotatably supported by a bearing 38 at the same rotation center as the rotating member 26 and is also rotatable with the connecting pipe 28. Is provided. A sliding surface 39 between the casing 33 and the rotor 34 is provided with a supply port 41 for supplying hydraulic oil and an oil seal 43 for preventing the hydraulic oil from flowing out.

An intermediate member 45 fixed to the rotor 34 with a connecting bolt 46.
The cylindrical portion 42 of the rotary table 40 is fixed to the rotary table 40 with a connecting bolt 47. A table body 44 is fixed to the lower end of the cylindrical portion 42. A hose reel 50 and a cord reel 54 are placed on the table body 44, and one end of the hydraulic hose 52 wound around the hose reel 50 is connected to a connection port 45a formed in the intermediate member 45. Further, one end of the cord 56 wound around the cord reel 54 is connected to a rotating unit (not shown) mounted on the table body 44.

Further, as shown in FIG. 5, the inner rib 72 and the outer rib 74, which extend downward from the flange 70 in the table body 44 at a predetermined interval, are substantially orthogonal to the center of rotation of the rotating member 26. Sliding holes 76 and 78 are formed in the direction, and these two sliding holes 76 and 78 are formed coaxially. A columnar sliding portion 82 of the connecting member 80 is slidably and rotatably fitted into both the sliding holes 76 and 78. Further, a collar 84 having a diameter larger than that of the sliding holes 76 and 78 is fitted and fixed between the sliding holes 76 and 78. On the other hand, a spring 86 is interposed between the outer rib 74 and the brim 84 to bias the connecting member 80 toward the connecting pipe 28. Further, at the same height as the sliding portion 82, a plurality of engaging holes 90 through which one end of the sliding portion 82 can penetrate are provided on the outer periphery of the connecting pipe 28.

On the other hand, a rectangular frame-shaped handle 92 is fixed to the other end of the sliding portion 82. Then, the outer rib 74 extends outward in the sliding direction of the sliding portion 82, and a through hole 94 through which the sliding portion 82 can freely pass.
The locking member 96 formed with is fixed. The locking member 96 is formed with first and second locking grooves 98 and 99 at every 90 degrees along the sliding direction. First locking groove 98
The ribs 84 are urged by the springs 86 so that the inner ribs are
When it comes into contact with 72, it is deeply formed so as to pass through the handle 92 that moves along with the movement. On the other hand, the second locking groove 99
Is shallowly formed so that the tip of the sliding portion 82 is stopped at a position where it does not protrude from the sliding hole 76 toward the connecting pipe 28.

Further, at the lower end of the kelly bar 10, as shown in FIGS. 3 and 4, a bottom expanding bucket 60 and a raw moat bucket 62 are replaceably attached. The other end of the hydraulic hose 52 wound around the hose reel 50 is connected to the kelly bar 10
When the bottom expanding bucket 60 is attached to
Connected to a hydraulic hose 53 provided on the
As the 60 moves up and down, it is paid out by the hose reel 50,
Or it is designed to be rolled up. On the other hand, when the bare moat bucket 62 is attached to the kelly bar 10, the other end of the hydraulic hose 52 is configured to be stored at a predetermined position on the rotary table 40.

Similarly, the other end of the cord 56 is connected to the kelly bar 10 by a bottoming bucket.
When the bottom expanding bucket 60 is attached, it is connected to the cord 57 on the side of the bottom expanding bucket 60, and is fed or wound up by the cord reel 54 as the bottom expanding bucket 60 moves up and down. On the other hand, as shown in FIG. 4, when the bare moat bucket 62 is attached to the kelly bar 10, it is stored at a predetermined position on the rotary table 40.

As shown in FIG. 3, the bottom expanding bucket 60 includes a plurality of bottom expanding wings 64, and a slider 68 is moved up and down by a hydraulic cylinder 66 that is operated by hydraulic oil supplied from a hydraulic hose 52, and a link arm 71 is provided. By swinging the
You can open and close. Also, the hydraulic cylinder 66
Is provided with a stroke detection sensor 69 that detects the movement of a piston or a lot (not shown) of the hydraulic cylinder 66 to detect the opening of the bottom expanding blade 64. The stroke detection sensor 69 includes the code 57 Are connected.

Next, the operation of the rotary table connecting mechanism of the excavator of this embodiment will be described.

First, as shown in FIG. 4, the uncoated moat bucket 62 is attached to the tip of the kelly bar 10. At this time, the tip of the hydraulic hose 52 and the tip of the cord 56 are stored at a predetermined position on the rotary table 40. When the operator holds the handle 92 and pulls it against the urging force of the spring 86, the sliding portion 82 moves while sliding in the sliding holes 76 and 78. And pull the handle 92
Rotate it 90 degrees and move the handle 92 to the second position as shown by the chain double-dashed line.
Align with the locking groove 99. Then, the urging force of the spring 86 allows the handle 92 to be inserted until it abuts on the bottom of the second locking groove 99. At that time, the tip of the sliding portion 82 does not protrude from the sliding hole 76 to the connecting pipe 28 side, and does not penetrate into the engaging hole 90 of the connecting pipe 28.

After the preparation is completed in this way, the hydraulic motor 22 is driven, and the rotary member 26 is rotationally driven via the pinion 24. The rotary drive of the rotary member 26 causes the kelly bar 10 to rotate.
It rotates at the same rotation center as, and the unexposed bucket 62 also rotates.
At this time, the rotation of the rotating member 26 is transmitted to the connecting pipe 28 via the intermediate member 36, and the connecting pipe 28 rotates together with the rotating member 26. On the other hand, the support member 32 fixed to the housing 17
Supports the rotary joint 30, and the rotor 34 of the rotary joint 30 is connected to the rotary table via the intermediate member 45.
Suspend 40. Since the sliding portion 82 of the connecting member 80 does not penetrate into the engaging hole 90 of the connecting pipe 28, the connecting pipe 28
Is not transmitted to the rotary table 40 via the connecting member 80, and the rotary table 40 does not rotate. In this state, the kerry bar 10 is rotated while descending, and the straight hole A is excavated by the bare moat bucket 62.

When the straight hole A is excavated, the unsealed bucket 62 is removed, and the bottom expanding bucket 60 is attached to the kelly bar 10 instead. Then, the position of the rotary table 40 is adjusted so that the engagement hole 90 is located on the sliding direction of the sliding portion 82. Then, the operator holds the grip 92, pulls it against the biasing force of the spring 86 to remove it from the second locking groove 99, and rotates the grip 92 to align it with the first locking groove 98. Then, when the force applied to the handle 92 is released, it is urged by the spring 86,
The sliding portion 82 moves toward the engagement hole 90 while sliding along the sliding holes 76 and 78. Then, as shown by the solid line, when the collar 84 contacts the inner rib 72, the tip of the sliding portion 82 is
It penetrates into the engagement hole 90 formed in 28.

After the preparation is completed in this way, the operator operates the winch 6 to reel out the wire rope 8 and the bottom expanding bucket 60 is lowered to the straight hole A together with the kerry bar 10. After directly reaching the bottom of the hole A, the pinion 24 is moved by the hydraulic motor 22.
The rotating member 26 is rotationally driven via the. This rotating member 26
The rotation driving of the kelly bar 10 causes the kelly bar 10 to rotate about the same center of rotation as the rotating member 26. At this time, the connecting pipe 28 also rotates in accordance with the rotational driving of the rotating member 26, and the rotation is transmitted to the rotary table 40 via the connecting member 80 penetrating the engaging hole 90,
As the rotary table 40 rotates, the rotor 34 fixed to the rotary table 40 via the intermediate member 45 also rotates.

Then, by operation of a hydraulic device (not shown), the hydraulic hose 20 and the rotary joint 30, the connection port 45a, the hydraulic hose 52, and the hydraulic hose 53 are supplied to the hydraulic cylinder 66 to drive the hydraulic cylinder 66. This hydraulic cylinder 66
The slider 68 descends due to the driving of, and the bottom expanding blade 64 gradually expands via the link arm 71.

As described above, in the rotary table coupling mechanism of the excavator of the present embodiment, the rotary table 40 is attached to the housing 17 of the drive device 16 fixed to the fixed portion 14 via the rotary joint 30, and the bottom expansion bucket is attached. 60 Keriba 10
When the rotation member 40 of the drive device 16 is transmitted to the rotary table 40 by the connecting member 80 when mounted on the rotary table 40, the rotary table 40 rotates at the same rotation center as the rotary member 26, and the rotary table 40 also expands with the bottom expanding bucket 60. Rotate. On the other hand, when the unearthed bucket 62 is attached to the kelly bar 10, the rotation of the rotating member 26 is blocked from being transmitted to the rotating table by the connecting member 80, the rotating table 40 does not rotate, and only the unearthed bucket 62 rotates. .

In this way, even when exchanging the bottom expanding bucket 60 and the uncoated moat bucket 62, it is not necessary to remove or reattach the rotary table 40 each time, and it is possible to rotate the rotary table 40 by an easy operation of operating the connecting member 80. Rotating table for rotating member 26
Since it can be transmitted to and cut off from 40, workability can be improved. Further, when the unexposed bucket 62 is used, the rotary table 40 does not rotate, and the weight of the rotary table 40 and the hose reel 50 and the like mounted on the rotary table 40 is also connected pipe 28.
Do not join. Therefore, the torque applied to the connecting bolts 35 and 37 is small, and the loosening of these can be prevented. Further, when the straight hole A is excavated using the unsealed bucket 62, the rotation speed is high, the operation is rough, and the rotation center is swaying, unlike the case where the bottom excavation using the bottom expanding bucket 60 is performed. There are many. However, since the rotor 34 does not rotate, the rotor 34 does not slide while strongly pressing against the oil seal 43 of the sliding surface 39, and it is possible to prevent unnecessary wear of the oil sheet 43 and prevent deterioration of durability. .

The present invention is not limited to such an embodiment as described above, and can be implemented in various modes without departing from the scope of the present invention.

[Effects of the Invention] As described in detail above, the rotary table connecting mechanism of the excavator of the present invention can transmit and block the rotation of the rotating member by the connecting member. Therefore, when exchanging the bucket, the rotating table is removed each time, There is no need to re-install,
Since an easy operation of operating the connecting member is sufficient, workability is improved, and the effects of preventing the connecting bolts and the like from falling off and reducing the wear of the sliding surface are achieved.

[Brief description of drawings]

FIG. 1 is a sectional view showing a rotary table connecting mechanism of an excavator according to an embodiment of the present invention, FIG. 2 is a front view of the excavator of this embodiment, and FIG. 3 is a front view of a bottom expanding bucket of this embodiment. Figure,
FIG. 4 is a front view of the bare moat bucket of this embodiment, and FIG. 5 is an explanatory view of the connecting member of this embodiment. 10 …… Kerry bar, 14 …… Fixed part 16 …… Drive device, 26 …… Rotating member 40 …… Rotating table, 60 …… Bending bucket 62 …… Underground bucket, 80 …… Coupling member

Claims (1)

[Scope of utility model registration request] 1. A kerry bar that moves up and down while rotating at the same center of rotation as a rotary member of a drive device provided in a fixed part, and a bucket that is replaceably attached to the lower end of the kerry bar. A rotary table rotatably supported at the same center of rotation as the rotary member is arranged in the fixed portion, and a connecting member capable of transmitting and blocking rotation of the rotary member to and from the rotary table. A rotary table connecting mechanism for an excavator, comprising: