JP3359872B2 - Crawler type traveling body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawler type traveling body capable of changing the distance between crawlers by extending or retracting a side frame.

[0002]

2. Description of the Related Art Conventionally, this type of crawler type traveling body has been used in a crawler crane shown in FIG. An upper swing body 2 is mounted on the lower frame of the crawler type traveling body 1 so as to swing freely, and a lattice jib (not shown) is attached to a front portion of the upper swing body 2 so as to be able to move up and down.
The crawler traveling body 1 has a pair of side frames 3a, 3b.
The crawlers 4a and 4b are attached to the side frames 3a and 3b.

[0003] The distance L1 between the crawlers 4a and 4b in such a crawler-type traveling body 1 is reduced as shown in the figure when the trailer is transported. As shown in b), it is expanded to L2. This operation of changing the distance between the crawlers 4a and 4b is performed by retracting and retracting the retracting cylinder, causing the side frames 3a and 3b to protrude to the left and right of the body,
This is done by being pulled into the center of the fuselage. A through-hole through which the axle beam of the lower frame is inserted is formed in a side portion of the side frames 3a and 3b, and the above-described overhang and retraction of the side frames 3a and 3b is performed by the axle beam being guided to the through-hole. Done.

In order to change the crawler type traveling body 1 from the trailer transporting posture shown in FIG. 1A to the working posture shown in FIG. 1B, first, the pin for fixing the overhang of the axle beam is removed, and As shown in FIG. 6A, the link fixing pins 6 of the left and right side frames 3a, 3b are removed in the direction indicated by the arrow. At this time, the pine needles 7, which are the stoppers of the link fixing pins 6, are removed. The link fixing pin 6
The fixing link 8 attached to the side frames 3a and 3b and the lug 9 provided on the axle beam 5 are fixed. The fixed link 8 is provided with a stopper 10.

When the link fixing pin 6 is removed, the fixing between the side frames 3a, 3b and the axle beam 5 is released. Next, the retract cylinder is extended, and the side frames 3a and 3b are respectively extended in the left-right direction of the body. Finally, the link fixing pin 6 is attached in the direction shown by the arrow as shown in FIG. With this attachment of the link fixing pin 6,
The side frames 3a, 3b and the axle beam 5 are fixed again.

On the other hand, in order to change the crawler type traveling body 1 from the working posture shown in FIG. 5 (b) to the trailer transporting posture shown in FIG. 5 (a), first, as shown in FIG. The link fixing pins 6 of the side frames 3a, 3b are removed in the direction indicated by the arrow, and the fixing between the side frames 3a, 3b and the axle beam 5 is released. Next, the retract cylinder is contracted, and the side frames 3a and 3b are retracted to the center of the fuselage. Finally, as shown in FIG.
The link fixing pin 6 is attached in the direction indicated by the arrow, and the pine needle pin 7 prevents the pin from coming off. By the attachment of the link fixing pins 6, the side frames 3a and 3b and the axle beam 5 are fixed again.

[0007]

The above-mentioned fixed link 8 and link fixing pin 6 are provided inside the side frames 3a and 3b,
That is, it is located below the upper swing body 2. Therefore, in the above-described conventional crawler type traveling body 1, when attaching and detaching the link fixing pin 6, the worker needs to enter the lower part of the upper swing body 2. For this reason, the workability of extending and retracting the side frames 3a and 3b under the conventional crawler-type traveling body 1 is poor in workability and poor in safety.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and has a lower frame for rotatably supporting an upper revolving unit, and a through-hole through which an axle beam of the lower frame is inserted. A pair of side frames, each having a mouth formed on a side portion thereof, to which a crawler is attached, wherein the axle beam is guided by the through hole so that the side frames are extended or retracted so that the distance between the side frames can be changed. In the traveling vehicle, one end is rotatably supported at the tip of an axle beam, and the extended axle beam is movable at the other end, and one end is rotatably supported outside the side frame near the through hole, and the other end. A movable end of the extended axle beam is rotatably supported at an intermediate portion of the link when the side frame is extended, , With the overhang of the side frame the intermediate support is along the outside of the side frames are attracted to the through port side, characterized in that the loose end is fixed to the outside of the side frame.

The work of projecting the side frame in the present structure is performed by pivotally supporting the floating end of the extended axle beam at the intermediate portion of the link, and projecting the side frame. Since the intermediate support portion is drawn to the through hole side along the outside of the side frame along with the overhang of the side frame, the link is fixed along the outside of the side frame, so that the side frame, the axle beam and Is fixed. In addition, the retraction work of the side frame is performed by releasing the fixing of the link floating end to the outside of the side frame and the fixing between the extended axle beam floating end and the link intermediate portion, and then retracting the side frame.

[0010] In this manner, the work of extending and retracting the side frame is performed by fixing the extended axle beam and the link outside the side frame. Therefore, there is no need for the labor for the worker to enter the inside of the dangerous side frame as in the related art during the overhanging and retracting work.

The present invention also provides a claw provided at the tip of the extension axle beam, and a claw provided on the outside of the side frame for guiding the movement of the extension axle beam by engaging with the claw when the side frame is extended. And a guide.

In this structure, when the side frame is extended, the claw of the extended axle beam engages with the guide provided on the side frame, and the movement of the extended axle beam and the link connected thereto is guided by the claw and the guide. Is done. Therefore, the fixed positions of the floating end of the link and the extended axle beam with respect to the side frame can be easily determined.

Further, according to the present invention, after the side frame is retracted, the extended axle beam and the link rotate in mutually opposite directions about the respective support ends to extend along the outside of the side frame, and each of the floating ends has a side end. It is characterized by being fixed to the outside of the frame.

According to this structure, when the extension axle beam or link is not used, the extension axle beam or link is easily stored along the side of the side frame without being removed from the side frame.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment in which a crawler type traveling body according to the present invention is applied to the above-described crawler crane will be described.

FIG. 1 is a partially enlarged plan view of a main part of the crawler type traveling body according to the present embodiment in a state where the side frame 21 is retracted toward the center C of the body, and FIG. FIG. 4 is a partially enlarged plan view of a main part in an overhanging state. In addition, the side frame 21 may be called a crawler frame.

A pair of side frames 21 is provided on the left and right sides of the body, and a tumbler 22 is attached. A crawler belt 23 that forms an endless track meshes with the tumbler 22, and the crawler belt 23 is driven to rotate by a hydraulic motor 24 with a speed reducer. The tumbler 22, the crawler belt 23, and the like constitute a crawler.

At the center of the lower frame 25, there is provided a revolving roller 26 for rotatably supporting the upper revolving unit, and axle beams 27 extend to the four corners of the lower frame 25. The tip of the axle beam 27 is inserted through a through hole 28 opened on the side of the side frame 21, and one end of an extended axle beam 29 is rotatably supported by a pin 30 at the tip of the axle beam 27. I have. The other end of the extension axle beam 29 that moves freely rotates about this support end. The axle beam 27 and the extended axle beam 29 constitute a part of the lower frame 25.

The through hole 28 guides the inserted axle beam 27 when the distance between the side frames 21 is changed by extending or retracting the side frames 21 as described later. A lug 31 is provided outside the side frame 21 in the vicinity of the through hole 28, and one end of the link 32 is rotatably supported by the lug 31 by a pin 33. The other end of the link 32 that floats,
It rotates about this support end.

FIG. 3A is a plan view in which the link 32 is omitted from the plan view shown in FIG. 2, and FIG. 3B is a side view of FIG. Note that FIG.
1 and 2 are denoted by the same reference numerals and description thereof is omitted.

On the lower end surface of the tip of the extension axle beam 29, a claw 34 composed of a pin, a bolt or the like protrudes downward. A receiving guide 35 is provided on the outer periphery of the lower side of the side frame 21 below the through-hole 28, the receiving guide 35 being split into two parts. This guide 35, as described later,
When the side frame 21 is extended, it engages with the pawl 34 to guide the movement of the extended axle beam 29.

When the side frame 21 of the undercarriage having such a configuration is extended, first, the retract cylinder is extended, and the extended axle beam 29 is brought to the position shown in FIG. 1 and 2 are denoted by the same reference numerals and the description thereof will be omitted. Next, the floating end of the extended axle beam 29 is rotatably supported by a pin 40 at the intermediate portion of the link 32, and the distal end of the extended axle beam 29 and the intermediate portion of the link 32 are connected.

Next, the retract cylinder is further extended, and the side frame 21 is further extended outward from the body center C. At this time, the intermediate support portion of the link 32 is drawn toward the through hole 28 along with the overhang of the side frame 21, and extends along the outside of the side frame 21 as shown in FIG. 2. The floating end of the link 32 is connected to a lug 41 provided outside the side frame 21.
Is fixed by a pin 39.

On the other hand, when retracting the side frame 21 from the extended posture shown in FIG. 2 to the retracted posture shown in FIG. 1, first, the pins 3 for fixing the link 32 to the side frame 21 are used.
After 9 is pulled out, the retract cylinder is contracted and the side frame 21 is retracted to the position shown in FIG. Next, the pin 40 connecting the tip of the extended axle beam 29 and the intermediate portion of the link 32 is pulled out, the retract cylinder is further contracted, and the side frame 21 is retracted to the position shown in FIG.

Next, the extended axle beam 29 and the link 32 are rotated in mutually opposite directions about the pin 30 and the pin 33, respectively, so that the side frame 2
1 along the outside. And extended axle beam 2
9 and the floating end of the link 32 are
Are fixed by pins 38 and 39 respectively to lugs 36 and 37 provided outside.

When removing the side frame 21 from the lower frame 25, first, the claw 34 made of a pin or a bolt is removed from the tip of the extended axle beam 29. When the claw 34 is removed, the claw 34 and the guide 35 do not engage with each other. Therefore, when the axle beam 27 is pulled out from the through hole 28, the side frame 21 is not restrained by the extended axle beam 29. The side frame 21 is attached to and detached from the lower frame 25 in this state.

That is, in the operation of projecting the side frame 21 in the crawler type traveling body according to the present embodiment, the floating end of the extended axle beam 29 is rotatably supported at the intermediate portion of the link 32, and the side frame 21 is projected. This is performed by fixing the floating end of the link 32 to the outside of the side frame 21. The retraction of the side frame 21 is performed by fixing the floating end of the link 32 to the outside of the side frame 21 and fixing the tip of the extended axle beam 29 to the intermediate portion of the link 32.
This is done by pulling in one. Further, the attachment / detachment of the side frame 21 is performed by removing the claws 34.

The extension and retraction work of the side frame 21 is performed by fixing the extension axle beam 29 and the link 32 outside the side frame 21. The work of attaching and detaching the side frame 21 is also performed outside the side frame 21. This eliminates the need for a worker to enter the inside of the dangerous side frame during the overhanging and retracting work and the attaching and detaching work. For this reason, the workability of the extension and retraction work of the side frame 21 and the attachment / detachment work is improved, and the safety of the work is improved.

Further, in this embodiment, since the claw 34 is provided at the tip of the extended axle beam 29 and the guide 35 is provided outside the side frame 21, the claw 34 is engaged with the guide 35 when the side frame 21 is extended. And an extension axle beam 29 and a link 32 connected thereto by a pin 40.
Is guided by the claw 34 and the guide 35. Therefore, when the extension of the side frame 21 is completed, the pin hole 32a opened at the floating end of the link 32 is provided.
(See FIG. 4) and the pin hole 41a of the lug 41 (see FIG. 4).
And the operation of inserting the pin 39 can be easily performed.

That is, the free end of the link 32 and the fixed position of the extended axle beam 29 with respect to the side frame 21 can be easily determined. As a result, the positioning of the side frame 21 with respect to the lower frame 25 can be easily performed, and the workability of the side frame overhang operation is improved.

After the side frame 21 is retracted toward the center C of the fuselage, the extended axle beam 29 and the link 3
2 are not used, these extended axle beams 2
The link 9 and the link 32 are easily stored without being detached from the side frame 21 and without protruding outside the fuselage along the side of the side frame 21. Therefore, use and storage of the extended axle beam 29 and the link 32 can be easily performed, and workability is improved.

[0032]

As described above, according to the present invention, the extension and retraction of the side frame is performed by fixing the extended axle beam and the link outside the side frame. This eliminates the need for a worker to enter the inside of the dangerous side frame during the overhanging and retracting work as in the related art, thereby improving workability and safety.

Also, by providing a claw at the tip of the extension axle beam and a guide outside the side frame, the claw engages with the guide when the side frame is extended, and the extension axle beam and the link connected thereto are moved. Is guided by the pawl and the guide. Therefore, the fixed positions of the floating end of the link and the extension axle beam with respect to the side frame are easily determined, the positioning of the side frame with respect to the lower frame can be easily performed, and the workability of the side frame extension operation is improved.

When the extended axle beam or link is not used and the extended axle beam or link is stored along the side of the side frame without being detached from the side frame, the use of the extended axle beam and link can be improved. Storage is easy and workability is improved.

[Brief description of the drawings]

FIG. 1 is a partially enlarged plan view of a main part of a crawler traveling body according to an embodiment of the present invention when a side frame is retracted.

FIG. 2 is a partially enlarged plan view of a main part of the crawler traveling body according to the embodiment when the side frame is extended.

3 (a) is a partially enlarged plan view of a main part of the crawler type traveling body shown in FIG. 2 from which links are omitted, and FIG. 3 (b) is a side view of FIG. 2 (a) with links attached.

FIG. 4 is a partially enlarged plan view of a main part of the crawler-type traveling body according to the present embodiment while the posture of the traveling body is changing.

FIG. 5A is a perspective view of a general crawler crane when a crawler traveling body is retracted into a side frame,
(B) is a perspective view when the side frame is extended.

FIG. 6A is a perspective view showing a first stage of a side frame overhang operation in a conventional crawler type traveling body, and FIG. 6B is a perspective view showing a second stage of the side frame overhang operation.

FIG. 7A is a perspective view showing a first stage of a side frame retracting operation in a conventional crawler type traveling body, and FIG. 7B is a perspective view showing a second stage of the side frame retracting operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 ... Side frame 25 ... Lower frame 27 ... Axle beam 28 ... Through hole 29 ... Extended axle beam 30, 33, 38, 39, 40 ... Pin 31, 36, 37, 41 ... Lug 32 ... Link 32a, 41a ... Pin hole 34 ... nail 35 ... guide

Claims (4)

(57) [Claims] 1. A lower frame for rotatably supporting an upper revolving structure, and a pair of side frames having through holes through which an axle beam of the lower frame is inserted and formed with a crawler, In the crawler type traveling body in which the axle beam is guided by the through-hole and the side frames are extended or retracted, and the distance between the side frames is changed, one end of the axle beam is rotatable at the tip thereof. An extended axle beam supported at one end and floating at the other end, and a link rotatably supported at one end outside the side frame near the through hole and rotatable at the other end; Sometimes, the floating end of the extension axle beam is rotatably supported at an intermediate portion of the link, and the link is Ri The intermediate support along with the out is along the outside of the side frame are drawn into the through hole side, the crawler type traveling body loose ends, characterized in that it is fixed to the outside of the side frame. 2. A claw provided at a tip of the extension axle beam, and a claw provided on an outer side of the side frame for engaging the claw when the side frame is extended to guide the movement of the extension axle beam. The crawler type traveling body according to claim 1, further comprising a guide. 3. The crawler-type traveling body according to claim 2, wherein the pawl is detachably attached to the extension axle beam. 4. After the retraction of the side frame, the extension axle beam and the link rotate in opposite directions about each support end and are along the outside of the side frame, and each free end is The crawler type traveling body according to any one of claims 1 to 3, wherein the traveling body is fixed to an outer side of the side frame.