JPH09109766A - Upper part turning structure frame for upper part turning crawler dump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain strength against an overhung load of a dump load-carrying platform, a cab, etc., and decrease a total height, by providing beams extended rearward and cross bars in a turn device mounting plate of an upper part turning structure frame, and connecting the beam to a vertical plate connected to a front deck extended to the front of the upper part turning structure frame. SOLUTION: A turning device mounting plate 10 is provided in almost a central part of an upper part turning structure frame 3, two beams 13 extended to a rear part are provided in the right/left of this frame. Brackets 15 having a pin hole 14 serving as a hoist support point of a dump pallet are provided in a rear end part of these beams. The right/left beams 13 are connected by cross bars 16, 17, a front deck 20 comprising frame units 21, 22, 23 is provided before the turning device mounting plate 10. The front deck 20 is placed lower than the beam 13, its rear end part is connected to the two beams 13 through a central vertical plate 24, right vertical plate 25 and a left vertical plate 26 in the front part of the turning device mounting plate 10. This connection part 30 is formed in a box structure, stress concentration in the connection part between the beam 13 and the frame unit 21 is relaxed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an upper rotating body frame of an upper rotating crawler dump truck.

[0002]

2. Description of the Related Art As a conventional crawler dump, an upper swing type crawler dump in which a dump carrier can swing with respect to a lower traveling body has been proposed. For example, FIG. 6 shows an upper swivel type crawler dumper proposed by Japanese Utility Model Laid-Open No. 55-135640. The outline will be described below with reference to FIG.

The upper swing type crawler dump is provided with a rotatable upper swing body frame 3 on a lower traveling body 1 having crawler belts 8 on the left and right. A driver's cab 4 and an engine room 5 are arranged in the front part on the upper swing body frame 3, and a dump carrier 6 is mounted on the rear part on the upper swing structure frame 3 so as to be able to rise and fall. It is capable of hoisting around a horizontal pivot pin 14a provided at the rear end of the revolving structure frame 3. A dump cylinder 7 for hoisting the dump carrier 6 is rotatably provided between the upper swing body frame 3 and the dump carrier 6, and the dump cylinder 7 is positioned near the pivot pin 14a. It is attached to the rear part of the upper swing frame 3 by a horizontal pivot pin 7a. Further, a swirl circle 2 having swivel inner teeth and a swivel motor equipped with a pinion that meshes with the swirl inner teeth are provided at approximately the center of the lower traveling body 1 (hereinafter, the swirl machine is combined with this swivel motor). (Referred to as “9”) is provided, and can be turned by the turning circle 2 and the turning machinery 9.

[0004]

In the upper swing type crawler dump, the swing circle 2 of the upper swing body frame 3 is used.
The rear part has a cantilever structure. That is, particularly when the dump truck 6 is raised and the soil is discharged, the pivot pin 7a of the dump cylinder 7 and the pivot pin 14a of the dump truck 6 are disposed.
A load is applied to the rear end portion of the upper swing body frame 3 to which is attached. For this reason, the structure of the upper swing body frame 3 needs to be able to sufficiently withstand the load when the dump truck 6 is loaded and the impact during traveling of the cargo. At the same time, there is a strong demand for lowering the overall height of the vehicle due to the height regulation of the loaded vehicle when the upper swing crawler dump is carried on a trailer vehicle or the like.
However, none of the above-mentioned conventional proposals particularly describes the structure of the upper swing body frame 3.

The present invention has been made in view of the above problems, and has sufficient strength against a cantilevered load such as a dump truck at the rear of the turning center and a driver's cab at the front of the turning center, and the overall height of the vehicle. It is an object of the present invention to provide an upper revolving structure frame of an upper revolving crawler dump capable of lowering the height.

[0006]

In order to achieve the above object, an upper swing body frame of an upper swing type crawler dump truck according to the present invention is mounted on a lower traveling body 1 and on the lower traveling body 1 so as to be rotatable. Upper revolving structure frame 3, driver's cab 4 and engine room 5 arranged at the front of upper revolving structure frame 3, dump carrier 6 arranged at the rear of upper revolving structure frame 3, and upper revolving structure In an upper revolving crawler dump provided with a revolving circle 2 and a revolving machinery 9 arranged substantially in the center of the frame 3, the upper revolving structure frame 3 is fixed to the lower surface of the upper revolving structure frame 3 in the substantially central part. , A swivel circle 2 and a swivel machinery 9, and swivel device mounting plates 10, and upper and lower swivel frame 3 at both left and right ends of the swivel device mounting plate 10.
Two beams 13 having a box cross-section and having a pin hole 14 which is a fulcrum fulcrum of the dump truck 6 at the rear end and are fixed to each other, and a plurality of beams 13 for connecting the left and right two beams 13 to each other. Crossbars 16 and 17, a front deck 20 composed of a plurality of frames 21, 22 and 23 extending forward of the upper revolving structure frame 3 and having a height lower than the two beams 13, and mounting of the revolving device. Stand plates 24, 25, 26 fixed to the front portion of the plate 10 for connecting the two beams 13 and the front deck 20, and the front deck 20 and the stand plate 24.
And a connecting portion 30 for connecting and.

As described above, the upper revolving structure frame has a beam having a box cross-section with high rigidity in the rear centering on the revolving device mounting plate provided in the central portion, and is higher than the rear beam in the front. It has a front deck composed of a frame with a low box cross-section. Therefore, sufficient strength is ensured even with a cantilever structure. Further, since the height of the driver's cab in front of the upper swing body frame is reduced, it is possible to reduce the total height of the upper swing crawler dump.

In the upper revolving structure frame of the upper revolving crawler dump, the connecting portion 30 connects the two frame bodies 21 in the central portion of the front deck 20 to each other.
4 and the stand plate 24, a swash plate 31, a lower surface plate 32 that connects the lower surfaces of the two frame bodies 21 in the central portion, both ends of the swash plate 31, the upper surface ends of the two frame bodies 21, and the stand The side plate 33 having a triangular shape connecting the portions surrounded by the plate 24 and the standing plate 24
And is formed into a box shape.

With the above construction, the vertical stress concentration occurring at the connecting portion between the stand plate and the front deck, which is constituted by a box-shaped frame body having a low front height, is relaxed.

In the upper revolving structure frame, a plurality of crossbars 16 and 1 for connecting the two right and left beams 13 to each other.
At least one of the seven is connected to the turning device mounting plate 10.

As described above, the rear portion of the upper revolving structure frame is composed of two left and right beams and a plurality of crossbars connecting the two beams, and at least one of the plurality of crossbars.
The book is connected to the swivel mounting plate. Therefore,
The cantilevered load on the rear part of the upper swing frame has a simple structure and is supported by the frame having sufficient strength.

In the upper revolving structure frame, at least one of the left and right beams 13 and the standing plate 24,
The ribs 27 and 25 are connected to each other.

With the above construction, the stress concentration in the left-right direction generated at the connecting portion of the central standing plate connecting the rear beam and the front deck is alleviated.

In the upper revolving structure frame, the two left and right beams 13 are located inside the left and right ends of the revolving circle 2, and the standing plate 24 is located rearward of the front end of the revolving circle 2. There is.

With the above construction, the load of the driver's cab, engine room, and dump truck can be directly received by the turning circle, and the joint with the turning circle can secure high rigidity.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the upper swing body frame according to the present invention will be described below in detail with reference to FIGS. FIG. 1 shows an overall side view of an upper turning crawler dump. An upper revolving structure frame 3 is rotatably mounted on the upper surface of a substantially central portion of a lower traveling body 1 having crawler belts 8 on the left and right sides through a revolving circle 2 and a revolving machinery 9. A driver's cab 4 and an engine room 5 are arranged in a front part of the upper revolving structure frame 3, and a dump carrier 6 is mounted in a rear part of the upper revolving structure frame 3 so as to be freely erected. Further, the dump carrier 6 is capable of hoisting around a horizontal pivot pin 14a provided at the rear end of the upper swing body frame 3.

2 and 3 are a plan view and a side view, respectively, of the upper revolving structure frame 3, and FIG. 4 is shown in FIG.
It is a front view which is the A view. Hereinafter, description will be given with reference to FIGS. In the substantially central portion of the upper swing body frame 3,
A turning device mounting plate 10 having a turning circle mounting seat 11 and a turning machinery mounting seat 12 is arranged. At the left and right ends of the swivel mounting plate 10, two beams 1 having a box-shaped cross section extending to the rear of the upper swing frame 3 are provided.
3 and 13 are fixed. Also, the two beams 1 on the left and right
Brackets 15 each having a pin hole 14 into which a pivot pin 14a, which serves as an undulating fulcrum of the dump carrier 6, are inserted are fixedly provided at the rear end portions 3 and 13, respectively. Left and right beams 1
Reference numerals 3 and 13 are located inside the left and right ends of the turning circle 2 attached to the turning circle attachment seat 11 of the turning device attachment plate 10.

Further, the left and right two beams 13, 13 are connected by a plurality of crossbars, and in this embodiment, they are connected by two crossbars 16, 17. At least one of the crossbars 16 is fixed to the rear end of the turning device mounting plate 10.

The left and right two beams 13 and 13 have a strength enough to withstand the load even when the dump carrier 6 on which the load is loaded is mounted and the load is discharged. It is configured to satisfy the height H and the plate thickness.

A front deck 20 is arranged in front of the turning device mounting plate 10. Front deck 20
Are two central frame bodies 21 and 21 extending forward of the upper swing body frame 3, left and right frame bodies 22 and 22, and left and right frame bodies provided at front end portions of these frame bodies. 23 and 23. The frame body 21, the frame body 22 and the frame body 23 have a height h lower than the height H of the beam 13 and have a box sectional shape similar to that of the beam 13. Further, the rear end portion of the front deck 20 has a central stand plate 24 fixed to the front portion of the turning device mounting plate 10.
And the right stand plate 2 fixed to the left and right ends of the center stand plate 24.
5 and the left stand plate 26, the two beams 13, 1
3 is connected. The central standing plate 24 is located rearward of the front end of the turning circle 2 attached to the turning circle attachment seat 11 of the turning device attachment plate 10.

The right beam 13 and the right standing plate 25 are connected by a rib 27, and the left beam 13 and the left standing plate 26 are connected by a battery case 28. The cab 4 is mounted on the front deck 20, but the height h of the frames 21, 22, 23 is low, so the overall height of the vehicle is low.

FIG. 5 is a sectional view taken along line BB of FIG.
Next, referring to FIG. 5, the front deck 20 and the central standing plate 2
The connecting portion 30 between the swivel device mounting plate 10 and the swivel device mounting plate 10 will be described in detail. Two central frames 21 and 2 of the front deck 20
1 are connected by a crossbar 34. The crossbar 34 and the central standing plate 24 are connected by a swash plate 31. A lower surface plate 32 is fixed to the lower surfaces of the two central frames 21 and 21. Furthermore, the swash plate 31
A portion surrounded by both end portions of the frame, the upper end of the central frame body 21 and the central standing plate 24 is fixed by a triangular side plate 33. In this way, the central standing plate 24, the swash plate 31,
The crossbar 34, the lower surface plate 32, and the triangular side plate 33 form a box shape to form the connecting portion 30.

As described with reference to FIG. 1, since the operator cab 4 is mounted on the left side of the front deck 20 and the engine room 5 is mounted on the right side, the front deck 20 has a cantilever structure. As a result, a large stress is generated in the connecting portion 30 between the central standing plate 24 on the base end side of the front deck 20 and the turning device mounting plate 10. However, due to the box structure of the connecting portion 30, the two beams 13 and 13 are formed. Center frame 21, 2
The stress concentration generated in the connection portion with 1 is relaxed.

Also, the stress concentration between the right beam 13 and the right standing plate 25 is relaxed by the ribs 27, and the stress concentration between the left beam 13 and the left standing plate 26 is also relaxed by the battery case 28. .

Further, the positions at which the left and right two beams 13, 13 and the central stand plate 24 are fixed to the turning device mounting plate 10 are located inside the outer peripheral end of the turning circle 2 attached to the turning circle mounting seat 11. I have to. Therefore, the vertical load of the driver's cab 4, the engine room 5, the dump truck 6, etc. is directly applied to the swivel circle 2, and the bending force applied to the swivel device mounting plate 10 is reduced. Therefore, the overall rigidity is extremely high.

[0026]

Since the upper revolving structure frame according to the present invention has the structure described in detail above, sufficient strength can be secured even with a cantilever structure by a simple structure. Further, since the height of the driver's cab in front of the upper swing body frame is reduced, the overall height of the upper swing crawler dump can be reduced, and the transportability can be improved.

The vertical stress concentration generated at the connecting portion between the standing plate and the front deck constituted by the front frame having a low height is alleviated, so that the durability can be improved. Also, the cantilever load on the rear part of the upper swing frame is a simple structure,
Also, it can be supported by a frame with sufficient strength. In addition, stress concentration in the left-right direction that occurs at the connection part of the central standing plate that connects the rear beam and the front deck is mitigated, so durability can be improved. . Furthermore, since the loads of the driver's cab, the engine room, and the dump truck can be directly transmitted to the turning circle, the joint with the turning circle can secure sufficient durability.

[Brief description of the drawings]

FIG. 1 is an overall side view of an upper turning crawler dump according to the present invention.

FIG. 2 is a plan view of an upper swing body frame according to the present invention.

FIG. 3 is a side view of the upper swing frame according to the present invention.

FIG. 4 is a front view of an upper swing frame according to the present invention.

5 is a cross-sectional view taken along the line BB of the connecting portion of FIG.

FIG. 6 is an overall side view of an upper swiveling crawler dump representing a conventional technique.

[Explanation of symbols]

 1 Lower traveling body 2 Revolving circle 3 Upper revolving structure frame 4 Driver's cab 5 Engine room 6 Dump carrier 7 Dump cylinder 7a Axis pin 8 Crawler track 9 Revolving machinery 10 Revolving device mounting plate 11 Revolving circle mounting seat 12 Revolving machinery mounting seat 13 Beam 14 Pin hole 14a Pivot pin 15 Bracket 16, 17 Crossbar 20 Front deck 21, 22, 23 Frame 24 Central standing plate 25 Right standing plate 26 Left standing plate 27 Rib 28 Battery case 30 Connecting part 31 Swash plate 32 Lower plate 33 Side plate 34 Crossbar

Claims (5)

[Claims] 1. A lower traveling structure (1), an upper revolving structure frame (3) rotatably mounted on the lower traveling structure (1), and a front part of the upper revolving structure frame (3). Driver's cab (4) and engine room (5), dump bed (6) arranged at the rear of upper swing frame (3), and upper swing frame (3)
In an upper swing type crawler dump provided with a swing circle (2) and a swing machinery (9) arranged in the substantially central portion of the upper swing body frame (3), the upper swing body frame (3) is approximately the center of the upper swing body frame (3). Fixed to the lower surface of the part,
The swivel device mounting plate (10) to which the swivel circle (2) and the swivel machinery (9) are mounted, and the left and right ends of the swivel device mounting plate (10), and
Two beams (13) with a box cross section that extend to the rear of the upper revolving structure frame (3) and are fixed to each other, and that have a pin hole (14) at the rear end that serves as the fulcrum fulcrum of the dump platform (6). )
And a plurality of crossbars (16, 16) connecting the two beams (13) on the left and right.
17) and a square-shaped front deck (21,22,23) that extends in front of the upper swing frame (3) and that is lower in height than the two beams (13). 20) and a stand plate (24, 24) fixed to the front part of the swivel mounting plate (10) and connecting the two beams (13) and the front deck (20).
25, 26) and a connecting portion (30) for connecting the front deck (20) and the stand plate (24), an upper swing body frame of an upper swing crawler dump truck. 2. The upper swing body frame of the upper swing crawler dump according to claim 1, wherein the connecting portion (30) is provided.
Is a swash plate (31) that connects the crossbar (34) that connects the two frame bodies (21) at the center of the front deck (20) and the standing plate (24), and the two frames at the center. Bottom plate (32) connecting the bottom of the body (21)
And both ends of the swash plate (31), the upper end of the two frame bodies (21) and the stand plate.
An upper revolving structure frame for an upper revolving crawler dump, which is formed in a box shape by a triangular side plate (33) connecting parts surrounded by (24) and a standing plate (24). 3. At least one of a plurality of crossbars (16, 17) connecting said left and right two beams (13) is connected to a swivel mounting plate (10). Or the upper revolving superstructure frame of the upper revolving crawler dump according to 2. 4. The rib (27) connects at least one of the two right and left beams (13) and the stand plate (24, 25, 26) to each other. The upper swing body frame of the upper swing type crawler dump described in. 5. The two left and right beams (13) are turning circles.
It is located inside both the left and right ends of (2), and the stand plate (2
The upper revolving superstructure frame of the upper revolving crawler dump according to claim 1, 2, 3 or 4, wherein 4) is located rearward of the front end of the revolving circle (2).