JP3645071B2 - Swivel lock device for construction machinery - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a turning lock device that is provided in a construction machine such as an earth drill and locks turning of an upper turning body.
[0002]
[Prior art]
A construction machine, for example, an earth drill machine, uses a crawler crane that can be turned as a base machine, and is provided with a drilling device to construct a vertical pile on the ground. Since the excavator of this earth drill machine excavates the ground by the rotation of the excavation bucket, the excavation reaction force during excavation acts on the base machine, causing the upper revolving structure to swing in the swivel direction, In order to prevent the upper turning body from turning undesirably, a turning lock device as shown in Japanese Utility Model Laid-Open No. 61-76866 is provided. This is because the track frame constituting the lower traveling body is provided with a grooved turning lock block at a position eccentric from the turning center, and the upper turning body is inserted into the groove of the block by an operation from the cab. A pin is provided, and the turning lock pin is engaged with the groove of the block to mechanically lock the turning.
[0003]
[Problems to be solved by the invention]
When excavation work is performed with the swivel lock as described above, the swivel lock pin slides on the wall surface of the groove (hole) of the block due to vibration, so that the groove wall surface particularly when the excavation bucket is rotated with high torque. Wear is severe. For this reason, the backlash between the swivel lock pin and the block increases during repeated excavation work, and the upper revolving body turns by the amount of backlash, resulting in a problem that the accuracy of the drilling hole is lowered and the drilling efficiency is deteriorated. . For this reason, in the past, the block itself provided on the lower track (lower traveling body) was replaced, or the worn block groove wall surface (sliding surface) was repaired by overlay welding, so that work was time consuming. In addition, when welding is applied, there is a problem that it is difficult to adjust the clearance between the swiveling block pin and the block groove (hole), leaving looseness, and the accuracy of the drilling hole cannot be improved.
[0004]
An object of the present invention is to provide a turning lock device that prevents an increase in play between the turning lock pin and the block by removably attaching a liner to a position where the turning lock pin of the block can come into contact.
[0005]
[Means for Solving the Problems]
Referring to FIGS. 1 and 3 showing an embodiment, the present invention relates to a recess 7 of a block 7 provided on the lower traveling body 3 with a turning lock pin 5 provided on the upper turning body 2 of the construction machine. This is applied to a device that locks the turning of the upper turning body 2 by engaging with 7a.
Then, the liner 8 is detachably attached using fixing means at a position where the turning lock pin 5 of the recess 7a can come into contact. The liner 8 is formed on the block 7 in order to hold the plate 8a on the wall surface of the concave portion 7a and the plate 8a disposed on the wall surface of the concave portion 7a (position where the swivel lock pin can contact). The pipe 8b is inserted through the through hole 7b. Then, the liner 9 is detachably fastened to the block 7 by inserting the bolt 9 into the pipe 8 b and screwing the nut 13 to the tip of the bolt 9.
The invention of claim 2 is configured such that the pipe 8b is inserted into the through hole 7b from the side of the block 7 and the bolt 9 is inserted into the pipe 8b from the side of the block 7.
The invention of claim 3 is such that the liner 8 is detachably fixed to the block 7 from the side of the block 7 by screw means 9, 13 or pins.
[0006]
In the section of the means for solving the above-described problem to explain the configuration of the present invention, the drawings of the embodiments are used for easy understanding of the present invention, but the present invention is thereby limited to the embodiments. It is not something.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
FIG. 14 shows an earth drill as a construction machine according to the present embodiment, and an upper swing body 2 is connected to the lower track 3 so as to be pivotable about a swivel wheel 4. A work machine including a boom and an excavation bucket is connected to the upper swing body 2, and the work machine is driven to excavate the ground.
FIG. 1 and FIG. 2 are diagrams showing the overall configuration of a turning lock device provided in the earth drill. FIG. 1 shows a non-turning lock state, and FIG. 2 shows a turning lock state. A swivel lock operation lever 6 is provided in the cab of the upper swing body 2, and when the lever 6 is operated, the swivel lock pin 5 moves up and down via the link mechanism 50. A block 7 is fixed to the lower track 3 by welding at a position spaced apart from the turning wheel 4 in the turning radius direction, and a turning lock pin 5 is engaged with a groove 7 a formed in the block 7, whereby the upper turning body 2. The turn is locked.
[0008]
A liner 8 is detachably attached to both side walls of the groove 7a of the block 7, that is, a position where the turning lock pin 5 contacts. As shown in FIG. 3, the liner 8 is formed by integrating a liner plate 8 a formed of mild steel and a pipe 8 b by welding, and the pipe 8 b is inserted into a horizontal hole 7 b formed in the block 7. Since the hole 7b is formed in communication with the groove 7a, the liner plate 8a is disposed on the wall surface of the groove 7a by inserting the pipe 8b in the direction A in the figure. Since the length of the pipe 8b is shorter than the width of the block 7 in the A and B directions, the pipe end portion does not protrude from the outer wall of the block. In this state, if the bolt 9 is inserted into the pipe 7b via the washer 10, and the nut 13 is screwed and tightened to the tip of the bolt 9 via the washers 11 and 12, the liner 8 is blocked via the pipe 8b. Fastened and fixed to. FIG. 4 is a sectional view showing the fastening state. As shown in FIG. 3, a slope 8c is formed at the upper end of the liner plate 8a, and this slope 8c serves to guide the turning lock pin 5 into the groove 7a.
[0009]
In this way, when the liner 8 is fixed to both walls of the groove 7a and the excavation operation is performed after performing the rotation lock, the rotation lock pin 5 slides on the liner plate 8a due to vibration, and the liner plate 8a is worn. To do. If the wear of the liner plate 8a progresses to some extent through repeated operations, the liner 8 needs to be replaced. In order to replace, the nut 13 is removed from the bolt 9, the bolt 9 is pulled out from the pipe 8a in the B direction, the liner 8 is removed in the same direction, and then the new liner 8 is mounted as described above.
[0010]
In the present embodiment, wear of the block 7 can be prevented by attaching detachable liners to both side walls of the groove 7a of the block 7 with which the swivel lock pin 5 comes into contact. The looseness generated between the blocks 7 can be repaired quickly and accurately. Thereby, the upper turning body 2 does not turn undesirably.
[0011]
In addition, since the liner 8 is attached to the block 7 using the bolt 9 and the nut 13, no special tool is required, the replacement work can be performed easily and quickly, and the replacement place is not limited. In particular, attachment / removal of the liner 8, specifically, insertion / removal of the liner 8 into / from the groove 7 a, insertion / removal of the bolt 9 into / from the pipe 8 a, and screwing / removal of the nut 13 from the side of the block 7, that is, A Therefore, even if the block 7 is arranged in the space between the upper swing body 2 and the track 3 (the space where the vertical width is narrow), the replacement can be performed smoothly. Further, the liner 8 is composed of a plate 8a and a pipe 8b, and the pipe 8b is inserted into the hole 7b of the block 7 so that the plate 8a is disposed at a predetermined position. Therefore, the liner 8 as a whole can be reduced in size and attached and detached. It becomes even easier.
[0012]
5 and 6 show another embodiment. Liners 8A having screw through holes (not shown) are arranged on both side walls of the block 7, and brackets 21 and 22 having screw holes (not shown) are arranged on the outer walls before and after the block 7 respectively. The bolts 23 are passed through the bracket 21, the liner 8 </ b> A, and the bracket 22 in this order and screwed together. Further, the two bolts 24 are passed through the bracket 21, the block 7, and the bracket 22 in this order and screwed together. This also makes it relatively easy to replace the liner 8A when worn.
[0013]
7 and 8 show another embodiment, and an engagement hole 70a into which the turning lock pin 5 is inserted and engaged is formed in the block 70. FIG. A cylindrical liner 8B is inserted into the engagement hole 70a, and the wall surface of the hole 70a is covered with the liner 8B. A flange 8Ba is formed at the upper end of the liner 8B, and the flange 8Ba is screwed to the upper surface of the block 70 by a plurality of bolts 31. According to this, even if the liner 8B is worn due to the contact of the turning lock pin 5, it can be easily replaced.
[0014]
9 to 11 show still another embodiment. The liner 80 includes a main body portion 81 disposed on the groove wall surface of the block 7 and an attachment portion 82 in which a screw through hole 82a is formed, and has a substantially L shape. The liner 80 is fastened to the block 7 by passing the bolt 91 through the screw through hole 82 a of the mounting portion 82 and screwing into the screw hole on the side surface of the block 7. The illustrated upper surface 81a of the main body 81 is a tapered surface, and this serves to guide the swivel block pin 5 into the groove 7a. Also according to the present embodiment, the wear of the block 7 can be prevented by attaching the liner 80, and the play generated between the swivel lock pin 5 and the block 7 can be repaired quickly and accurately by replacing the liner 80. Further, since the liner 8 is mounted in the lateral direction, the replacement can be performed smoothly even if the block 7 is disposed in the space between the upper swing body 2 and the track 3 (the space where the vertical width is narrow).
[0015]
In the above description, the liner is fastened to the block using bolts and nuts, but may be attached by pins.
12 and 13 show an example in which the liner 8C is attached to the wall surface of the hole 7a of the block 7 by welding. In this case, it takes more time to attach and detach the liner 8C than when using bolts and pins, but there is an effect that the backlash can be repaired with higher accuracy than conventional overlay welding.
[0016]
【The invention's effect】
According to the present invention, since the liner is detachably attached to the recess of the turning lock block, even if the liner is worn due to contact with the turning lock pin, it can be easily replaced with a new one. The backlash with the block does not increase, and the deterioration of excavation accuracy can be prevented. In particular, the liner is composed of a plate and a pipe, and the pipe is fastened with a nut through a bolt . Therefore , the liner can be reduced in size and can be easily replaced.
If the liner is configured to be fixed to the block by screw means or pins from the side of the block, the replacement work can be smoothly performed even in a space where the vertical distance between the upper swing body and the lower traveling body is narrow.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a turning lock device according to an embodiment, showing a non-turning lock state.
FIG. 2 is a view similar to FIG. 1, showing a turning lock state.
FIG. 3 is a perspective view for explaining a method of attaching the liner 8 to the block 7;
4 is a cross-sectional view illustrating a method for attaching the liner 8 to the block 7. FIG.
FIG. 5 is a plan view for explaining a liner mounting method according to another embodiment.
6 is a front view of FIG. 5. FIG.
FIG. 7 is a perspective view illustrating a liner mounting method according to another embodiment.
FIG. 8 is a cross-sectional view showing a part of FIG.
FIG. 9 is a plan view for explaining a liner mounting method according to another embodiment.
10 is a front view of FIG. 9. FIG.
11 is a perspective view showing the liner alone in FIG. 9. FIG.
FIG. 12 is a plan view for explaining a liner mounting method according to another embodiment.
13 is a front view of FIG.
FIG. 14 is a side view of an earth drill having a turning lock device.
[Explanation of symbols]
2 Lower track 3 Upper turning body 4 Turning wheel 5 Turning lock pin 6 Turning lock operating lever 7, 70 Block 7a Groove 7b Hole 8, 8A, 8B, 8C Liner 8a Liner plate 8b Pipe 8c Slope 9, 23, 24, 31 Bolt 13 Nuts 21 and 22 Bracket 50 Link mechanism 70a Engagement hole

Claims (3)

In the device for locking the turning of the upper swing body by engaging the swing lock pin provided on the upper swing body of the construction machine with the recess of the block provided on the lower traveling body,
A plate disposed on the wall surface of the recess at a position where the swivel lock pin can come into contact with the plate, and is integrated with the plate, and is inserted into a through hole formed in the block to hold the plate on the wall surface of the recess. With a liner consisting of
A turning lock device for a construction machine , wherein a bolt is inserted into the pipe and a nut is screwed onto a tip of the bolt so that the liner is detachably fastened to the block . 2. The swing lock for a construction machine according to claim 1, wherein the pipe is inserted into the through-hole from a side of the block, and the bolt is inserted into the pipe from a side of the block. apparatus. In the device for locking the turning of the upper swing body by engaging the swing lock pin provided on the upper swing body of the construction machine with the recess of the block provided on the lower traveling body,
A construction comprising a liner disposed at a position where the swivel lock pin of the recess can come into contact, and the liner is detachably fixed to the block by the screw means or the pin from the side of the block. Mechanical swivel lock device .

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