JP3364186B2 - Tread fixing device for construction machinery - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tread fixing device for a construction machine, and in particular, the left and right tread members are slid by the retracting operation of a retract cylinder. The present invention relates to a tread fixing device for a construction machine in which a tread is formed so as to be able to expand and contract. [0002] Construction machines equipped with crawlers, such as crawler cranes and crawler backhoes, have a wide tread of the airframe in order to enhance stability during work. When transporting the construction machine, it is necessary to reduce the tread of the fuselage so that it can be loaded on a truck. For this reason, this type of construction machine is provided with a retract cylinder for expanding and contracting the tread of the airframe. FIG. 6 shows a lower traveling body 1 of a conventional mobile crane. A lower frame 2 of the lower traveling body 1 has a cylindrical body 4 on which an upper revolving body 3 is slidably mounted, and the cylindrical body. 4 includes axle beams 5 and 5 that are fixed in the front and rear direction and extend in the left-right direction. The tread members 6L are slidable in the left-right direction at both ends of the axle beams 5 and 5.
6R is mounted, and the drive sprocket 7 and the driven sprocket 8 are attached to the tread members 6L and 6R,
A crawler 9 is installed between the sprockets 7 and 8. Further, a retract cylinder 10 is attached to the lower part of the cylindrical body 4 and both ends thereof are connected to the left and right tread members 6L, 6R, and the left and right tread members 6L, 6R are connected.
Both end portions of the axle beam 5 are inserted into guide holes 11L and 11R provided in R to be slidably supported, and the tread members 6L on the left and right sides of the axle beam 5 are expanded and contracted by the retracting operation of the retract cylinder 10.
6R is slid, and the tread of the fuselage is formed to be able to expand and contract. Fixing lug plates 12L and 12R are fixed to the front and rear surfaces of the axle beams 5 and 5 near the left and right sides of the cylindrical body 4, and the inner side of the left and right tread members 6L and 6R is fixed. The lug plates 12L, 12 are provided on stopper arms 13L, 13R projecting inward from the side.
R is fixed by a pin 14. Therefore, when the tread of the machine body is reduced so that the construction machine is loaded on the truck, after the machine is jacked up, the operator enters under the upper swing body 3,
For example, the pin 14 of the lug plate 12L on the left side of the machine body is pulled out to release the fixation between the lug plate 12L and the stopper arm 13L. Next, by retracting the retract cylinder 10, the left tread member 6 </ b> L moves inward of the airframe while sliding in the guide holes 11 </ b> L and 11 </ b> L with respect to the axle beams 5 and 5. Thus, the tread on the left side of the machine body is reduced, and the operator fixes the lug plate 12L and the stopper arm 13L to the reduced position with the pins 14. The tread on the right side of the aircraft will be reduced in the same way. On the other hand, when the tread of the machine body is expanded so as to be in a working posture after the construction machine is transported to the work site, the operator pulls out the pin 14 in the same manner as described above to remove the lug plates 12L, 1
2R and the stopper arms 13L and 13R are unlocked, and then the retract cylinder 10 is extended to expand the tread of the airframe. After that, the operator again pin 1
4 is inserted and the lug plates 12L and 12R and the stopper arm 1 are inserted.
3L and 13R are fixed. Since the conventional tread fixing device for this type of construction machine is provided on the axle beams inside the left and right tread members as described above, when changing the tread, Each time, the worker had to go under the upper swing body and insert / remove the pins. For this reason, there is a risk that the operator may be caught by the machine if the operator performs a traveling operation of the machine body or a turning operation of the upper-part turning body while the operator is inserting and removing the pin.
In addition, it is difficult to see the pin insertion state from the outside of the aircraft,
There is a risk that the tread fixing check operation may be uncertain. Therefore, in the construction machine in which the tread of the fuselage is formed so as to be able to be expanded and contracted, there arises a technical problem to be solved in order to enable the tread fixing work to be performed easily and safely. It aims at solving this subject. The present invention has been proposed to achieve the above object, and is a lower frame constituting a lower traveling body of a construction machine, wherein the lower frame is turned upward. A cylindrical body for pivotally mounting the body, an axle beam fixed to the front and rear of the cylindrical body and extending in the left-right direction, and attached to both ends of the axle beam so as to be slidable in the left-right direction The tread member is mounted, a retract cylinder is mounted on the cylindrical body, its both end portions are connected to the left and right tread members, and both end portions of the axle beam are inserted into the guide holes provided in the tread member to be slidable. The retractable cylinder can be expanded and contracted by sliding the left and right tread members against the axle beam by the retracting operation of the retract cylinder. In the formed construction machine, one end of the fixed link is pivotally attached to either the outer surface of the tread member and the vicinity of the guide hole and supported so that the fixed link can be rotated horizontally, The other end portion of the fixed link is formed to be fixable to both the outer surface of the tread member and the front and rear sides of the guide hole and the other, and the tip end portion of the connection link is pivoted to the intermediate portion of the fixed link. The connecting link is supported so that it can rotate horizontally, and the base end of this connecting link is connected to the tip of the axle beam, and the fixed link rotates horizontally as the tread of the fuselage expands and contracts. Thus, the present invention provides a tread fixing device for a construction machine, which is configured to be fixed at any of the front and rear positions. DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. For convenience of explanation, the same components as those in the prior art are denoted by the same reference numerals, and description thereof is omitted. FIG. 1 shows a crawler crane 20 as an example of a construction machine.
Is mounted so as to be pivotable in all horizontal directions. Upper swing body 3
A boom 21 is pivotally mounted at the front of the vehicle, a cabin 22 is provided on the side thereof, and a gantry 23 is erected on the rear of the upper swing body 3 and a bail 24 is mounted. One end of a boom pendant rope 25 is connected to the tip of the boom 21, and a bridle 26 is attached to the other end of the boom pendant rope 25. The bail 24 and the bridle 26
A boom hoisting rope 27 is installed on each sheave (not shown), and the boom hoisting rope 27 is wound up and down by driving a boom winch 28 to raise and lower the boom 21. On the other hand, a guide sheave 29 and a top sheave 30 are pivotally attached to the tip of the boom 21, and a hook rope 32 fed from a hook winch 31 is hung around the guide sheave 29 and the top sheave 30 to hang vertically. A hook 33 is attached to the tip of the rope 32. FIG. 2 shows the lower traveling body 1, in which the right side of the airframe is in a state where the tread is contracted and the left side is in a state where the tread is expanded. In the figure, both end portions of axle beams 5 and 5 of the lower frame 2 are inserted into guide holes 11L and 11R provided in the left and right tread members 6L and 6R, and are slidably supported. Left and right tread members 6L and 6R with respect to the axle beams 5 and 5 by the expansion and contraction of the retract cylinder 10 provided in the lower part of the
Is configured to expand and contract the tread of the fuselage by sliding. As shown in FIGS. 2 and 3, the outer surface of the tread members 6L, 6R and the guide holes 11L,
The bracket 40 is fixed to one of the positions before and after the 11R near the one end portion 41a of the fixed link 41 to the bracket 40 pivotally mounted at pin P _1, so that the fixed link 41 is horizontally angularly movable To support. On the other hand, on the outer surface of the tread members 6L, 6R and the guide holes 11L, 1R
The position of either one of the front and rear in the vicinity of 1R and the other, that is, the fixed link 41 rotates horizontally, and the tread member 6
Brackets 42 and 43 are fixed at positions substantially parallel to the outer surfaces of L and 6R, respectively, and the other end 41b is fixed to the bracket 42 even when the fixed link 41 is rotated in any direction. Or it is formed so that it can be connected to 43 with a pin P ₂ . Further, the tip portion 45a of the connecting link 45 to an intermediate portion of the fixed link 41 to pivotally at pin P _3, together with the connecting link 45 is supported so as to be horizontally rotated, the connecting link The base end portion 45b of 45 is pivotally attached to the tip end portion of the axle beam 5. The connecting link 45 is slightly curved in a bow shape, and when the left and right tread members 6L and 6R slide relative to the axle beam 5, the tip 45a of the connecting link 45 pushes the intermediate portion of the fixed link 41. In order to pull, the fixed link 41 is connected to the pin P ₁
Is horizontally rotated in the range of about 180 degrees in the front-rear direction.
Reference numeral 46 denotes a stopper provided on the brackets 42 and 43. The stopper 46 restricts a collision with the tread members 6L and 6R when the fixed link 41 rotates, and a pin hole on the other end 41b of the fixed link. and a pin hole of the bracket 42, 43 to match one that facilitates the insertion of the pin P ₂ in. Thus, when the tread of the machine body is reduced in order to load the crawler crane 20 on the truck, after the machine has been jacked up, the operator, for example, outside the left tread member 6L, the pin P ₂ Then, the fixing link 41 and the bracket 43 are released from being fixed. Next, by retracting the retract cylinder 10, the left tread member 6 </ b> L moves inward of the airframe while sliding in the guide holes 11 </ b> L and 11 </ b> L with respect to the axle beams 5 and 5. At this time, as the tread member 6L moves inwardly, as shown in FIG. 4, the fixed link 41 is pushed outward by the connecting link 45 and horizontally rotates from one of the guide holes 11L to the other. Furthermore, the retract cylinder 1
If 0 is contracted, as shown in FIG.
L further moves inward, and the fixed link 41 rotates to a position on the opposite side of about 180 degrees from the position of FIG. The inner movement of the tread member 6L is restricted by a stopper 47 fixed to the axle beam 5. Then, when inserting the pin P ₂ after to match the pin hole of the pin hole and the bracket 42 of the other end portion 41b of the fixed link, the fixed link 4
1 and the movement of the connecting link 45 are fixed, and the axle beam 5 cannot move, and the tread of the fuselage is fixed in the contracted state. On the other hand, when the tread of the machine body is expanded to bring the crawler crane 20 into the working posture, the reverse operation is performed. That is, after jacking up the airframe, the operator, for example, the left tread member 6L shown in FIG.
The pin P ₂ is pulled out from the outer side to release the fixing of the fixing link 41 and the bracket 43. Next, when the retract cylinder 10 is extended, the left tread member 6L moves with respect to the axle beams 5, 5 while sliding in the guide holes 11L, 11L. In that case, as shown in FIG. 4, the fixed link 41 is pulled inward by the connecting link 45 and horizontally rotated from the other side of the guide hole 11L to the opposite side. Further, when the retract cylinder 10 is extended, as shown in FIG. 3, the tread member 6L is moved further outward, and the fixed link 41 is rotated to a position on the opposite side of about 180 degrees. And the other end 41 of the fixed link
If the pin hole and the pin insertion by matching the pins P ₂ and the hole of the bracket 43 of b, the the movement of the pinned links 41 and connecting link 45 can not move the axle beam 5, the tread of the aircraft Fixed in the expanded state. [0020] Since the fixed link 41 with the expansion and contraction of the retraction cylinder 10 is horizontally rotating back and forth, it can be fixed and released tread only by insertion and removal of the pin P ₂ easily. If it is desired to rotate the fixed link 41 independently of the retracting operation of the retract cylinder 10, the tip 45 of the connecting link is used.
By keeping remove the pin P ₃ of a, it is possible to prevent the fixed link 41 when the tread scaling rotates. The present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones. As described in detail in the above embodiment, the present invention slides the left and right tread members with respect to the axle beam of the lower frame by the retracting operation of the retract cylinder, thereby In a construction machine in which the tread can be expanded and contracted, a fixed link can be horizontally rotated at any position before and after the outer surface of the guide hole of the tread member, and the distal end of the fixed link and the axle beam serve as a connecting link. As the tread is expanded and contracted, the fixed link automatically rotates horizontally and automatically rotates horizontally from one of the front and rear of the guide hole to the other position.
The tread can be fixed very easily by inserting a pin at each position. Since the pin insertion / removal operation is performed outside the tread member, there is a risk that the operator may be caught in the machine even if the operator mistakenly performs the traveling device or turning operation of the machine body during the pin insertion / removal operation. Safety can be ensured. Moreover, since it is easy to visually recognize the pin insertion state from the outside of the machine body, it is an invention that exhibits various effects, such as being able to confirm tread fixation reliably.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a crawler crane according to an embodiment of the present invention. FIG. 2 shows a lower traveling body of a crawler crane, (a)
Is a partially cutaway plan view, (b) is a side view, and (c) is a partially cutaway rear view. FIG. 3 shows the operation of the fixed link and the connecting link with the tread extended, (a) is a partially cutaway plan view;
(B) is a side view. 4A and 4B show the operation of a fixed link and a connecting link in a state where the tread is in an intermediate state between expansion and contraction, where FIG. 4A is a partially cutaway plan view, and FIG. 4B is a side view. FIG. 5 shows the operation of the fixed link and the connecting link in a state where the tread is reduced, (a) is a partially cutaway plan view;
(B) is a side view. FIG. 6 shows a lower traveling body of a conventional crawler crane,
(A) is a partially cutaway plan view, (b) is a side view, and (c) is a rear view. [Explanation of Symbols] 1 Lower traveling body 2 Lower frame 3 Upper turning body 4 Cylindrical body 5 Axle beam 6L, 6R Tread member 10 Retract cylinder 11L, 11R Guide hole 20 Crawler cranes 40, 42, 43 Bracket 41 Fixed link 45 Link P ₁ , P ₂ , P ₃ pins

Claims (1)

(57) Claims 1. A lower frame constituting a lower traveling body of a construction machine, wherein the lower frame includes a cylindrical body for rotatably mounting an upper swing body, It consists of an axle beam fixed to the front and back of the cylinder and extending in the left-right direction, and a tread member that is slidable in the left-right direction at both ends of the axle beam. A retract cylinder is attached to the cylinder. Then, both ends of the axle beam are connected to the left and right tread members, and both ends of the axle beam are inserted into guide holes provided in the tread member so as to be slidably supported. In a construction machine in which left and right tread members are slid relative to each other so that the tread of the fuselage can be expanded and contracted, the outer surface of the tread member and the guide One end of the fixed link is pivotally attached to either the front or back in the vicinity of the hole so that the fixed link can be horizontally rotated, and the other end of the fixed link is connected to the outer surface of the tread member and the guide. It is formed so that it can be fixed to either one of the front and rear in the vicinity of the hole, and the other, and the tip of the connecting link is pivotally attached to the intermediate part of the fixed link so that the connecting link can be horizontally rotated. In addition, the base end portion of the connecting link is connected to the tip end portion of the axle beam, and the fixed link is horizontally rotated and fixed at any position before and after the tread of the fuselage. A tread fixing device for construction machinery.