JP3748815B2 - Pile driver lifting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an elevating device that includes, for example, an auger of an excavator, a hammer of a pile driving machine, and the like and moves up and down along a leader of the mounted pile driving machine, and particularly, a pile constituted by a rack type lifting means. The present invention relates to a lifting device for a hammer.
[0002]
[Prior art]
Conventionally, for example, a device disclosed in Japanese Patent Publication No. 6-78617 has been proposed regarding a lifting device provided with a working device such as a hammer or the like for driving an auger, pile or sheet pile for excavation. FIG. 4 is a side view of a pile driver equipped with the lifting device disclosed in the publication. In this pile driving machine 100, a leader 102 is pivotally supported on the front part of a self-propelled base machine 101, and the leader 102 is connected by a backstay cylinder 103 so as to be raised and lowered. A pair of guide pipes 104 is fixed to the left and right side surfaces of the leader 102, and a rack 105 having rack teeth engraved symmetrically on both side surfaces is fixed between the guide pipes 104.
[0003]
In such a pile driving machine 100, an auger 110, which is a working device for suspending an auger screw (not shown) and performing excavation work, is attached to the leader 102 via a lifting device 120 so as to be lifted and lowered. The auger 110 has an attachment 111 for connecting an auger screw, and is configured such that a driving force of a drive motor that rotates the auger screw is transmitted to the attachment 111 via a reduction gear in the gear box 112. The elevating device 120 provided with the auger 110 is mounted so that it can be raised and lowered with respect to the standing reader 102 with the guide pipes 104 and 104 sandwiched between the guide gibbs 121 and 121.
[0004]
Here, FIG. 5 is a plan view showing the lifting device 120. In the elevating device 120, a pair of pinion gears 122, 122 that sandwich and mesh the rack 105 from both sides are arranged to face each other, and each driving force of the hydraulic motors 123, 123 is reversely transmitted to the pinion gears 122, 122 via a gear reduction mechanism. The rotation of the motor is decelerated and transmitted. Therefore, when excavating the ground with this pile driving machine 100, the rotation of the drive motor 112 is given to the auger screw connected to the auger 110, and simultaneously the hydraulic motors 123, 123 of the lifting device 120 are driven. As a result, the rack 105 engaged with both pinion gears 122 and 122 rolls to lower the lifting device 120, and the ground is excavated by the rotating auger screw.
[0005]
[Problems to be solved by the invention]
By the way, for example, to increase the press-fitting or pulling-out force of the auger screw can be achieved by increasing the lifting force of the lifting device 120 of the conventional example. For that purpose, the capacity of the hydraulic motors 123, 123 is increased. It is conceivable to increase the supply pressure of the hydraulic oil that drives the hydraulic motors 123 and 123. However, in such a case, the gear strength of the pinion gears 122 and 122 and the rack 105 is insufficient, the tooth width and the module have to be increased, and the weight is increased, which impairs the stability of the pile driving machine 100. It will be. In particular, since the rack 105 is provided over the entire length of the reader 102, the influence on the weight increase is great.
[0006]
Further, since the conventional lifting device 120 is lifted and lowered by the pair of pinion gears 122, 122, a large one is used in terms of gear strength. Accordingly, the pinion gears 122 and 122 must be positioned between the guide gibbs 121 and 121 arranged above and below to avoid interference with the guide gibbs 121 and 121 holding the reader 102, and the lifting device 120 is moved in the vertical direction. The dimensions will be large. This is detrimental to the stability of the pile driver 100 due to the increase in weight, and restricts the stroke of the lifting device 120 relative to the leader 102, which is contrary to the requirement to dig deep as much as possible with a single lift. Met.
[0007]
Then, an object of this invention is to provide the small raising / lowering apparatus with a big raising / lowering force.
[0008]
[Means for Solving the Problems]
A lifting device for a pile driving machine according to the present invention includes a working device such as an auger or a hammer, and rotates a pinion gear that meshes with a rack provided in a leader of the pile driving machine, and guide guides sandwiching a guide pipe of the leader. It is moved up and down along the leader while being guided, and has two or more pairs of pinion gears arranged so as to sandwich the rack in the lifting direction, and a lifting hydraulic motor is provided for each pinion gear. It is characterized by that.
[0009]
Therefore, according to the present invention, the number of pinion gears is increased to four or more, and the meshing position with the rack is more than doubled compared to the conventional one. Therefore, each pinion gear can reduce the tooth width and the module, and the lifting hydraulic motor Even small capacity can be used. Therefore, the entire lifting device can be reduced in size by reducing the pinion gear and the rack, and the lifting force is increased by increasing the number of lifting hydraulic motors even with a small capacity.
[0010]
Further, in the lifting device for a pile driving machine according to the present invention, the pinion gear is sized so that the two pinion gears opposed to each other with the rack interposed therebetween can be accommodated in a pair of guide gibs that sandwich the guide pipe of the leader from both sides. It is characterized by.
Therefore, according to the present invention, since it is not necessary to shift the arrangement of the pinion gear and the guide gib, the overall height of the apparatus can be reduced by reducing the height dimension. Moreover, since the guide gibbe also functions as a cover for the pinion gear, it is possible to prevent the lubricant from being scattered and caught in the rotating gear.
[0011]
Also, the lifting device of the pile driving machine according to the present invention is such that the working device projects downward the rotation of the working hydraulic motor provided on the rotating gear case via the reduction gear in the rotating gear case. An auger for transmitting to an output shaft, wherein four lifting hydraulic motors are arranged two above and below a rotating gear case, and in particular two lifting hydraulic motors arranged below are rotating gear cases It is arranged in the lower dead space.
Therefore, according to the present invention, it is possible to use each of the lifting hydraulic motors having a smaller capacity than the conventional one by being moved up and down by driving the four lifting hydraulic motors. It can be arranged in a space that has conventionally been a dead space, and the lifting device including the auger can be downsized.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of a lifting device for a pile driving machine according to the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing the lifting device of the present embodiment. 2 is a view showing the lifting device of the present embodiment from the side of the reader mounting surface, and FIG. 3 is a view showing a part of the AA cross section shown in FIG. Similar to the lifting device 1 also show the prior art, is mounted on the reader pile driver as shown in FIG. 4, it is for moving up and down and the like auger and hammer to work.
[0013]
The lifting device 1 of the present embodiment is constructed integrally with an auger 20, and as shown in FIG. 1, a rotating gear case 21 with a built-in speed reducer is horizontally projected from the main body frame 3. Yes. In the auger 20, an attachment 22 for connecting an auger screw and the like from the rotating gear case 21 protrudes downward, and the working hydraulic motor 23 on the rotating gear case 21 is driven via a reduction gear with respect to the attachment 22. It is configured to be transmitted.
[0014]
The lifting device 1 is provided so that guide gibbs 2, 2... Are provided at four positions on the main body frame 3 on the upper, lower, left, and right sides (FIG. 2). (FIG. 3). Therefore, the lifting device 1 is attached to the reader 51 by the four guide gibbs 2, 2,..., And the guide gibbs 2, 2,. Yes. The lifting device 1 is configured to be lifted and lowered by a rack and pinion as in the conventional example. In the present embodiment, two pairs of pinion gears 6a to 6d are arranged one above the other with the rack 53 interposed therebetween, and these four pinion gears 6a to 6d have four lifting hydraulic motors 5 and 5 that are independently driven. ... are assembled via a reduction gear. Accordingly, the pinion gears 6a to 6d are individually rotated by the lifting hydraulic motors 5, 5.
[0015]
Lifting device 1 is more that was shared by the lifting power to four pinion gears 6 a to 6 d, each one of the pinion gear 6 a to 6 d may be a small tooth width and module, compared with the conventional It is small and light. When the pinion gears 6a to 6d are downsized, the rack 53 meshing with the pinion gears 6a and 6d also has a smaller tooth width and module, and the rack 53 provided over almost the entire length of the reader 51 can be formed narrow. Therefore, the four pinion gears 6a to 6d are arranged so as to be accommodated between the guide gibbs 2, 2,... Attached to the left and right as shown in FIG. Four lifting hydraulic motors 5, 5... Are arranged corresponding to the positions of the pinion gears 6a to 6d.
[0016]
The four lifting hydraulic motors 5, 5... Are arranged two above and below each other with the rotating gear case 21 of the auger 20 interposed therebetween. In particular, the two lifting hydraulic motors 5, 5 arranged on the lower side are arranged in a dead space immediately below the rotating gear case 21. This is because the lifting force is obtained from the four lifting hydraulic motors 5, 5..., So that each lifting hydraulic motor 5, 5. This is because the small lifting hydraulic motors 5 and 5 can be arranged in a narrow dead space.
[0017]
Subsequently, according to the lifting device 1 having such a configuration, as described above, the auger screw is connected to the attachment 22 to the auger 20 which is the working device and is attached to the leader 51 of the pile driving machine. When the working hydraulic motor 23 of the auger 20 is driven, the rotation gives rotation to the auger screw connected to the attachment 22 via the speed reducer, while the lifting device 1 is driven by the lifting hydraulic motors 5, 5. The pinion gears 6a to 6d are rotated in a predetermined direction. When the rack 53 in which the pinion gears 6a to 6d are meshed is rolled, the lifting device 1 is lowered, and the ground is excavated by the rotating auger screw . In particular, in the lifting device 1 of the present embodiment, the lifting and lowering force is increased by using the four lifting hydraulic motors 5, 5... .
[0018]
By the way, at the time of raising / lowering of the raising / lowering apparatus 1, each pinion gear 6a-6d is rotationally driven by the four raising / lowering hydraulic motors 5,5 ... which are the same hydraulic sources and drive each independently. Therefore, even if there is a manufacturing error in the lifting hydraulic motors 5, 5..., The pinion gears 6 a to 6 d, the rack 53, etc., the driving force of the pinion gears 6 a to 6 d can always be kept at the same value. Is possible.
[0019]
In addition, the lifting device 1 functions so that the two pairs of pinion gears 6a to 6d arranged on the upper and lower sides always maintain the posture by eliminating the right and left inclination. During excavation work of the ground, the auger screw may be subjected to an eccentric load by hitting a hard foreign object such as rock. In such a case, even if a swing occurs in the auger screw and a rotational moment M as shown in FIG. 2 acts on the lifting device 1, the rotational moment M is received by, for example, the pinion gears 6a and 6d arranged vertically. Accordingly, the elevating device 1 itself has a small left / right deflection, and performs the elevating operation while always centering the auger screw .
[0020]
And according to this lifting / lowering device 1, in order to improve the straightness of excavation and prevent twisting when the device is tilted, the guide gibbs 2, 2. The sliding was lost and the wear could be prevented.
[0021]
In addition, the lifting device 1 can arrange the pinion gears 6a to 6d, which have been reduced in size, inside the guide gibs 2, 2,..., And thereby the arrangement of the pinion gears 6a to 6d and the guide gibs 2, 2,. Therefore, it is possible to reduce the overall height of the apparatus by reducing the height dimension, and it is also possible to provide the guide gibbs 2, 2. Then, by arranging the pinion gears 6a to 6d inside the guide gibs 2, 2,..., The guide gibs 2, 2... Function as a cover for the pinion gears 6a to 6d, and the scattering of the lubricating oil and the rotation of the rotating gears. It became possible to prevent pinching.
[0022]
Further, the two pairs of pinion gears 6a to 6d facing each other are formed so that the rack teeth on both sides are symmetrical so as to mesh simultaneously with the rack teeth in the same phase. Since the pinion gears 6a to 6d arranged on both sides rotate reversely to each other, when a driving force is generated by the meshing pressure angle at the meshing portion of the rack teeth and the pinion gears 6a to 6d, the horizontal component of both driving forces is generated. Negate each other and only the vertical component remains. By eliminating the horizontal component force from the driving force, unnecessary force is not applied to the reader 51 and the lifting device 1, so that extra strength is not required and the weight can be reduced, so that the working capacity of the pile driving machine is improved. Further, since frictional resistance due to the horizontal component force is eliminated between the guide gibbs 2, 2,... And the guide pipes 52, 52, wear of the guide gibbs 2, 2,. A lifting force as a pulling force can be obtained effectively.
Furthermore, even if a failure occurs in one of the drive systems due to a broken tooth or the like, the lifting device 1 can be prevented from falling by another drive system, and the safety is high because it is engaged at four locations.
[0023]
In addition, this invention is not limited to the thing of the said embodiment, A various change is possible in the range which does not deviate from the meaning.
In the above-described embodiment, two pairs of pinion gears 6a to 6d are provided, but three pairs of six pinion gears may be used, and the number of meshing positions with the rack may be increased.
Moreover, although the said embodiment demonstrated and demonstrated the raising / lowering apparatus 1 provided with the auger 20 as a working apparatus, a hammer etc. other than this may be sufficient as a working apparatus.
[0024]
【The invention's effect】
Since the present invention has two or more pairs of pinion gears arranged so as to sandwich the rack in the ascending / descending direction, and provided with a lifting / lowering hydraulic motor for each pinion gear, a small lifting device having a large lifting force is provided. It became possible.
[Brief description of the drawings]
FIG. 1 is a side view showing an embodiment of a lifting device.
FIG. 2 is a view showing a mounting surface side showing one embodiment of the lifting device.
3 is a view showing a lifting device in the AA cross section shown in FIG. 2. FIG.
FIG. 4 is a view showing a pile driver equipped with a lifting device.
FIG. 5 is a plan view showing a conventional lifting device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lifting apparatus 2 Guide give 3 Main body frame 5 Lifting hydraulic motor 6a, 6b, 6c, 6d Pinion gear 20 Auger

Claims (3)

Pile driver that has a working device such as an auger or hammer, rotates the pinion gear that meshes with the rack provided in the leader of the pile driving machine, and moves up and down along the leader while being guided by the guide gibbles sandwiching the guide pipe of the leader In the lifting device of
A lifting device for a pile driving machine, wherein two or more pairs of pinion gears arranged so as to sandwich the rack are provided in the lifting direction, and a lifting hydraulic motor is provided for each pinion gear. In the pile driving device as claimed in claim 1,
A lifting device for a pile driving machine, wherein the pinion gears are sized so that two pinion gears arranged opposite to each other with a rack sandwiched in a pair of guide gibs sandwiching a guide pipe of a leader from both sides. In the lifting device of the pile driving machine according to claim 1 or 2,
The working device is an auger that transmits the rotation of a working hydraulic motor provided on a rotating gear case to an output shaft that protrudes downward through a reduction gear in the rotating gear case. The two lifting hydraulic motors are arranged above and below the rotating gear case, and in particular, the two lifting hydraulic motors arranged below are arranged in a dead space below the rotating gear case. A lifting device for a pile driver.

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