JP2002339403A - Turning frame of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability and durability at welding work by enhancing rigidity through simple welding work. SOLUTION: This turning frame 5 is provided with a blocking-up plate part 13 extending up to an upper surface of a frame base board 6 from a rear part of an upper plate part 12. A lower side part 13A of this blocking-up plate part 13 is welded to the frame base board 6. A left side part 13B and a right side part 13C are welded to a left longitudinal plate 8 and a right longitudinal plate 9 to form the front side of the turning frame 5 as a closed box structure. Thus, the turning frame 5 can enhance the rigidity to a shock. As a result, when welding the upper plate part 12 and the blocking-up plate part 13, sufficient strength can be obtained only by performing the welding work from the outside easy in work, and the workability of the welding work can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turning frame of a construction machine suitable for use in a construction machine such as a hydraulic shovel.

[0002]

2. Description of the Related Art Generally, construction machines such as hydraulic excavators are
A lower traveling body and an upper revolving body mounted on the lower traveling body via a revolving device so as to be pivotable, and a working device for excavating soil and the like can be raised and lowered in front of the upper revolving body. It is provided in.

[0003] Also, among the hydraulic excavators, there is a small hydraulic excavator called a mini excavator that swings (swings) a working device to the left and right with respect to an upper revolving unit. These are known from Kaihei 10-331198, JP-A-2000-96613, and the like.

A revolving frame of this type is made of a plate extending in the front and rear directions, and has a frame substrate on the lower surface side of which an outer ring of a revolving wheel constituting a revolving device is mounted, and a left side of an upper surface of the frame substrate. A left vertical plate extending forward and rearward and welded to the frame substrate; a right vertical plate positioned rightward of the upper surface of the frame substrate and extending forward and rearward and welded to the frame substrate; An upper plate which is located on the front side of the frame substrate and is welded to the upper portion of each of the vertical plates is roughly constituted. And the front side of the frame substrate is the upper plate and the left,
The right vertical plate constitutes a high-strength box structure. In addition, a swing post provided on the base end side of the working device is attached between the front side of the frame substrate and the upper plate so as to swing left and right.

[0005] In addition, since a load such as an excavation reaction force is applied to the revolving frame when an excavating operation or the like is performed by a working device, the revolving frame is designed to withstand an impact.
It is necessary to increase rigidity.

[0006] Therefore, the above-mentioned Japanese Patent Application Laid-Open No. Hei 10-33119 is described.
In the revolving frame disclosed in Japanese Patent Publication No. 8, when the upper plate is mounted on the upper part of the left vertical plate and the right vertical plate, fillet welding is performed from both the outside and the inside of each vertical plate, and the upper plate and each vertical plate are firmly connected. Welded. Further, since the central portion of the frame substrate has high strength due to the attached outer ring, the rear portion of the upper plate is extended to near the upper portion of the outer ring. In this way, the revolving frame has improved rigidity against impact and the like during excavation work.

[0007]

By the way, the revolving frame disclosed in JP-A-10-331198 described above is
Since the rear part of the upper plate is extended to near the upper part of the outer ring attached to the frame substrate, the frame substrate, the left vertical plate,
The depth of the space surrounded by the right vertical plate and the upper plate becomes longer. For this reason, when the upper plate is welded to each vertical plate from the inside, the welding operation is difficult, and there is a problem that the workability is deteriorated even if, for example, a welding robot or the like is used.

In particular, in the case of a small hydraulic excavator, the frontage of the space surrounded by the frame substrate, the left vertical plate, the right vertical plate, and the upper plate is further reduced, so that the welding robot can be operated inside the space. Can not. Therefore, the inside welding operation must be performed manually, and there is a problem that workability during the welding operation is greatly reduced.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to improve rigidity by a simple welding operation, and to improve workability and durability during the welding operation. It is an object of the present invention to provide a revolving frame of a construction machine which can be used.

[0010]

In order to solve the above-mentioned problems, a turning frame of a construction machine according to the first aspect of the present invention comprises a frame substrate composed of a plate body extending forward and rearward,
A left vertical plate positioned to the left of the upper surface of the frame substrate and extending forward and rearward and welded to the frame substrate; and a left vertical plate positioned to the right of the upper surface of the frame substrate and extending forward and rearward to the frame substrate. A welded right vertical plate, an upper plate located on the front side of the frame substrate and welded to an upper portion of each of the vertical plates, at least to close a gap between a rear position of the upper plate and the frame substrate. The left and right edges are constituted by a closing plate welded to the left and right vertical plates.

With this configuration, the box structure composed of the frame substrate, the left vertical plate, the right vertical plate, and the upper plate can be closed by the closing plate to form a closed box structure. Rigidity can be increased. In addition, by increasing the rigidity by the closing plate, for example, when welding the upper plate and the closing plate, sufficient rigidity can be obtained only by welding from the outside, where the welding operation is simple.

According to the second aspect of the present invention, one plate body extending in the front and rear directions is bent at an intermediate position in the longitudinal direction, so that the front side from the bent portion corresponds to the upper plate. And the rear side from the bent portion is formed as a closing plate portion corresponding to a closing plate, and the lower end portion of the closing plate portion is welded to the upper surface of the frame substrate.

With this configuration, the upper plate corresponding to the upper plate and the closing plate corresponding to the closing plate can be formed only by bending one plate body. A welding operation for welding the plate and the like can be omitted.

According to the third aspect of the present invention, the upper plate and the closing plate are formed by separate members, and the upper end of the closing plate is welded to the rear portion of the upper plate, and the lower end is welded to the upper surface of the frame substrate. It is in the configuration.

With this configuration, since the upper plate and the closing plate can be formed by different members, it is possible to individually select, for example, the material and thickness of the upper plate and the closing plate.

According to the fourth aspect of the present invention, one plate body extending in the front and rear directions is bent at two positions in the length direction, thereby being located on the rear side and corresponding to the rear part of the frame substrate. A rear substrate, a closing plate portion located between two bent portions and corresponding to a closing plate, and an upper plate portion located on the front side and corresponding to an upper plate are integrally formed, and a front portion of the frame substrate is formed. Is formed by a separate member, and the front substrate is welded to the front side of the rear substrate.

With this configuration, the upper plate portion corresponding to the upper plate and the closing plate portion corresponding to the closing plate can be formed only by bending one plate body. A welding operation for welding the plate and the like can be omitted. Further, the load acting on the upper plate can be smoothly transferred to the rear substrate via the integrally formed closing plate, and this load can be received by the rear substrate having strength.

According to the fifth aspect of the present invention, the left vertical plate is
It is formed by joining a front left vertical plate on the front side from the middle position in the rear direction and a rear left vertical plate on the rear side from the middle position, and the right vertical plate is formed from the middle position in the front and rear directions and the front part on the front side. It is formed by joining the right vertical plate and the rear right vertical plate on the rear side from the middle position.

With this configuration, the front left vertical plate, the rear left vertical plate, the front right vertical plate, and the rear right vertical plate can be formed by different members. ,
The material, thickness and the like of the rear left vertical plate, the front right vertical plate, and the rear right vertical plate can be individually selected.

According to the sixth aspect of the present invention, a front connecting vertical plate is provided between the front portion of the left vertical plate and the front portion of the right vertical plate, and the front connecting vertical plate integrally connects the two. This is because the front side between the left and right vertical plates is closed.

With this configuration, the left vertical plate and the right vertical plate can be formed only by bending one plate body. Moreover, frame board, left vertical board, right vertical board,
It is possible to form a closed box structure that is substantially closed by the front connection vertical plate, the upper plate, and the closing plate, and it is possible to increase rigidity.

According to the seventh aspect of the present invention, the closing plate is arranged to be inclined forward and backward. Thereby, since the closing plate can be formed to be long within the height of the vertical plate, the closing plate can be welded to the left vertical plate and the right vertical plate with a long welding distance. Rigidity against impacts and the like during work can be increased.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a swing frame of a crawler type hydraulic shovel will be described in detail as an example of a swing frame of a construction machine according to an embodiment of the present invention with reference to the accompanying drawings.

First, FIGS. 1 to 9 show a first embodiment of the present invention. 1 is a crawler type undercarriage,
Reference numeral 2 denotes an upper revolving structure that is rotatably mounted on the lower traveling structure 1 via a revolving device 3.
A work device 4 for performing excavation work of earth and sand is provided.

Here, in the turning device 3, an inner wheel (not shown) of the turning wheel is attached to the lower traveling body 1 side, and an outer wheel 3A (see FIGS. 4 and 5) of the turning wheel is connected to a turning frame 5 (described later). It is attached to the upper rotating body 2). In addition, the turning frame 5
A turning motor (not shown) is attached to the motor, and a gear of the turning motor meshes with an internal gear (not shown) provided inside the inner ring. Then, the turning device 3 can turn the upper turning body 2 on the lower traveling body 1 by rotating and driving the gear of the turning motor.

The working device 4 includes a swing post 4B attached to the front end of the revolving frame 5 via a connecting pin 4A so as to be able to swing left and right, and a swing post 4B.
B, a boom 4C mounted to be able to move up and down, and an arm 4D mounted to the tip of the boom 4C so as to be able to move up and down.
And a bucket 4E rotatably attached to the tip of the arm 4D. A swing cylinder 4F is provided between the turning frame 5 and the swing post 4B, and the swing post 4B and the boom 4
C, a boom cylinder 4G is provided.
An arm cylinder 4H is provided between C and the arm 4D, and a bucket cylinder 4J is provided between the arm 4D and the bucket 4E.

Reference numeral 5 denotes a revolving frame constituting a base of the upper revolving unit 2. As shown in FIGS. 3 to 7, the revolving frame 5 has a frame substrate 6, an integral vertical plate 7, and an upper plate-closing plate which will be described later. It is roughly constituted by the plate 11 and the like.

Reference numeral 6 denotes a frame substrate of a revolving frame 5 made of a thick steel material. As shown in FIGS. 4 and 5, the frame substrate 6 extends in the front and rear directions, and has a substantially triangular shape having an acute angle on the front side. It is formed as a flat plate. A thick boss member 6A made of a separate member is welded to the front end of the frame substrate 6, and the connecting pin 4 is inserted through the boss member 6A.
A pin hole 6B into which A is inserted is formed. further,
On the lower surface side of the frame substrate 6, an outer ring 3A of the turning device 3 is mounted at a central portion in the front and rear directions.

Reference numeral 7 denotes an integrated vertical plate which is provided upright on the upper surface of the frame substrate 6. The integrated vertical plate 7 prepares a strip-shaped thick steel plate, and is provided at an intermediate position in the longitudinal direction of the steel plate. The left vertical plate 8, the right vertical plate 9, and the front connecting vertical plate 10 are integrally formed by performing a bending process to form a front connecting vertical plate 10 described later.

Reference numeral 8 denotes a left vertical plate provided on the left side of the frame substrate 6 so as to stand in a substantially vertical direction. The left vertical plate 8 is located on the upper surface of the frame substrate 6 and is located on the left side of the frame substrate 6. The lower end is welded to the frame substrate 6 while gradually extending to the left along the front and rear directions. Further, the left vertical plate 8 has a lower height dimension on the rear side for mounting the engine 18 and the like, and is one step lower on the front side where the upper plate portion 12 described later is attached. Further, on the rear side of the left vertical plate 8,
A bracket 8A to which the swing cylinder 4F is attached is fixed.

Reference numeral 9 denotes a right vertical plate provided on the right side of the frame substrate 6 so as to stand substantially vertically.
Is located on the upper surface of the frame substrate 6,
And extend substantially straight forward and rearward along the right side of, and the lower end is welded to the frame substrate 6. Also, the right vertical plate 9
Like the left vertical plate 8, as shown in FIG. 6, the rear side is formed to have a small height dimension for mounting the engine 18 and the like, and the front side to which the upper plate portion 12 described later is attached is lowered by one step. I have.

Further, reference numeral 10 denotes a front portion of the left vertical plate 8 and a right vertical plate 9.
The front connecting vertical plate 10 is formed in a semi-cylindrical shape protruding forward and has a left end following the front end of the left vertical plate 8 and a right end. The part is integral with the front end of the right vertical plate 9. And the front connecting vertical plate 10
As in the case of the vertical plates 8 and 9, the lower end is welded to the frame substrate 6.

The integrated vertical plate 7 thus configured is welded to the upper surface of the frame substrate 6 from both the outside and the inside by means such as fillet welding. The welding work at this time is
Since the welding operation is performed on the left vertical plate 8, the right vertical plate 9, and the front connecting vertical plate 10 which are first attached to the frame substrate 6, there is no obstacle in the periphery, and the welding operation can be easily performed using, for example, a welding robot. Can be welded.

Numeral 11 designates an upper plate-closing plate combined plate provided on the front side of the integrated vertical plate 7, and the upper plate-closing plate combined plate 11 is integrally formed with an upper plate portion 12 and a closing plate portion 13 which will be described later. It is constituted by. And the upper plate-closing plate combined plate 11 is
By bending a single plate body extending in the front and rear directions at a bending line C1 at an intermediate position in the longitudinal direction, the upper plate portion 12 corresponding to the upper plate is formed on the front side with respect to the bending line C1. And a closing plate portion 13 corresponding to the closing plate on the rear side.

Numeral 12 denotes an upper plate portion which is located on the front side of the frame substrate 6 and is provided on the integral vertical plate 7 and which serves as an upper plate. The upper plate portion 12 is arranged in a horizontal direction substantially parallel to the frame substrate 6. It is arranged to extend. The upper plate portion 12 supports the swing post 4B of the working device 4 together with the front portion of the frame substrate 6 so as to swing left and right. Further, the upper plate portion 12 constitutes a portion on the front side from the bending line C1 of the upper plate / closing plate combined plate 11. Also, the upper plate 12
Has a substantially triangular shape with an acute angle on the front side, and is arranged so as to face the front side portion of the frame substrate 6.
Further, a boss member 12A made of another member is welded to the front end portion of the upper plate portion 12 so as to face the boss member 6A of the frame substrate 6, and penetrates the boss member 12A and the like to form a pin hole 12B.
Are formed.

Then, as shown in FIG.
The left vertical plate 8 and the right vertical plate 9 are welded from the outside in the left and right directions by fillet welding, and are welded to the front connecting vertical plate 10 from the outer peripheral side by fillet welding. As a result, the upper plate portion 12 is connected to each of the vertical plates 8 by a simple welding operation from the outside.
9 and 10.

Reference numeral 13 denotes a closing plate portion which forms a closing plate integrally provided on the rear side of the upper plate portion 12, and the closing plate portion 13 of the turning frame 5 responds to an impact transmitted from the working device 4 during excavation work, for example. The upper plate-closing plate combined plate 11 is used to increase the rigidity.
Is provided at a portion on the rear side from the bending line C1. The closing plate portion 13 extends obliquely downward from the rear portion of the upper plate portion 12 toward the rear, and a lower side portion 13 </ b> A reaches the upper surface of the frame substrate 6. Further, the left side 1 of the closing plate 13
3B extends obliquely along the left vertical plate 8 and has a right side 13
C extends straight forward and backward along the right vertical plate 9.

The closing plate portion 13 is located between the left vertical plate 8 and the right vertical plate 9 as shown in FIGS.
The left side portion 13B is welded to the right surface of the left vertical plate 8 from above by fillet welding, and the right side portion 13C is welded to the left surface of the right vertical plate 9 from above to fillet. The lower side 13A of the closing plate 13 is welded to the upper surface of the frame substrate 6 by fillet welding.

Thus, the frame substrate 6, the left vertical plate 8,
Right vertical plate 9, front connecting vertical plate 10, upper plate portion 12, closing plate portion 13
Can form a closed box structure, and can increase the rigidity of the revolving frame 5 against impact and the like. In the welding operation at this time, the closing plate portion 13
Since the welded portions of the frame substrate 6, the left vertical plate 8, and the right vertical plate 9 are exposed to the outside, it can be fixed to the frame substrate 6, the vertical plates 8, 9 by a simple welding operation from the outside. .

Further, since the closing plate portion 13 is arranged obliquely, it is formed longer than the height of the left vertical plate 8 and the right vertical plate 9 compared to, for example, the case where it is vertically installed. can do. Thereby, the welding distance between the left vertical plate 8 and the right vertical plate 9 can be lengthened, and the welding from only one external side can be performed.
Sufficient rigidity can be obtained against an impact during excavation work.

Reference numeral 14 denotes a cab support plate located on the left side of the left vertical plate 8 and attached to the frame substrate 6. The cab support plate 14 includes a cab, a fuel tank, a battery (all not shown), and the like. It is to support. Further, 15 is located on the right side of the right vertical plate 9,
A radiator support plate 16 is mounted on the radiator support plate 15, and a tank support plate provided on the front side of the radiator support plate 15.

On the other hand, reference numeral 17 denotes a counterweight attached to the rear end of the turning frame 5;
Reference numeral 7 designates a weight balance with the working device 4, and is formed in an arc shape corresponding to a turning radius.

Reference numeral 18 denotes an engine serving as a power source. The engine 18 has a counterweight 1 at the rear side of the turning frame 5.
7 is mounted in a horizontal state extending leftward and rightward. A hydraulic pump is mounted on the left side of the engine 18, and a radiator (both not shown) is disposed near the right side above the radiator support plate 15.

Reference numeral 19 denotes a hydraulic oil tank located on the right side of the turning frame 5 and provided in front of the engine 18.
The hydraulic oil tank 19 stores hydraulic oil and is mounted on the tank support plate 16.

The hydraulic shovel according to the present embodiment has the above-described configuration, and its operation will be described next.

First, when the vehicle is traveling at the work site, the traveling hydraulic motor (not shown) of the lower traveling body 1 is driven to move the vehicle forward or backward. When the digging work of earth and sand is performed, the lower traveling body 1
The earth 4 is excavated by the bucket 4 </ b> E of the working device 4 by turning the upper swing body 2 or raising and lowering the working device 4.

When performing a trench excavation work, the swing cylinder 4F is extended or contracted to swing the working device 4 left and right, and the upper device is turned upward in the opposite direction to the swing direction of the working device 4. The body 2 is turned. Thus, the working device 4 is disposed outside in the left and right directions, so that the ditching work can be performed by raising and lowering the working device 4 at this position.

As described above, according to the present embodiment, the turning frame 5 is provided with the closing plate 13 extending from the rear of the upper plate 12 to the upper surface of the frame substrate 6.
Reference numeral 3 denotes a configuration in which the lower side 13A is welded to the frame substrate 6, and the left side 13B and the right side 13C are welded to the left vertical plate 8 and the right vertical plate 9, respectively. Therefore, a closed box structure can be formed by the frame substrate 6, the left vertical plate 8, the right vertical plate 9, the front connecting vertical plate 10, the upper plate portion 12, and the closing plate portion 13. 5 can be increased in rigidity.

Moreover, since the rigidity can be increased by the closing plate 13, for example, the upper plate 12, the closing plate 13
When the upper plate-closing plate combined plate 11 is welded to the integrated vertical plate 7, sufficient strength can be obtained only by performing welding work from the outside, where work is easy.

As a result, welding work can be easily performed using a welding robot or the like. Also, the upper plate 12
Does not need to be extended rearward as in the prior art, so that the welding operation can be easily performed in this respect as well. Thereby, workability related to the welding operation can be improved, and the manufacturing cost can be reduced.

Further, since the closing plate 13 is provided obliquely downward toward the rear, the closing plate 13 and the left vertical within the height of the left vertical plate 8 and the right vertical plate 9 are provided. The welding distance between the plate 8 and the right vertical plate 9 can be increased. Thereby, the closing plate portion 13 can further increase the strength of the revolving frame 5 and can improve the durability.

The upper plate portion 12 and the closing plate portion 13 are
The upper plate-closing plate combined plate 11 made of two steel plates is
Since it can be integrally formed by bending along 1, welding work between the rear end of the upper plate portion 12 and the front end of the closing plate portion 13 can be omitted, and workability at the time of assembly can be improved. Can be.

Further, since the integrated vertical plate 7 is formed by providing the front connecting vertical plate 10 on the front side of the left vertical plate 8 and the right vertical plate 9, the integrated vertical plate 7 is bent into one steel material. Is performed to form the front connecting vertical plate 10, the left vertical plate 8, the right vertical plate 9, and the front connecting vertical plate 10 can be easily formed, and the manufacturing cost can be reduced. Moreover, the frame substrate 6, the left vertical plate 8, the right vertical plate 9, the front connecting vertical plate 10, the upper plate portion 1
2. Since a complete closed box structure can be formed by the closing plate 13, sufficient rigidity can be obtained against an impact during excavation work and the like, and durability can be improved.

Next, FIGS. 10 and 11 show the second embodiment of the present invention.
Is shown. The feature of this embodiment is that the upper plate and the closing plate are formed by separate members, the left and right sides of the closing plate are welded to the left vertical plate and the right vertical plate, and the upper end of the closing plate is attached to the rear portion of the upper plate. And the lower end is welded to the upper surface of the frame substrate. In the present embodiment,
The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 21 denotes a turning frame according to the present embodiment,
Reference numeral 22 denotes an upper plate provided on the front side of the revolving frame 21,
The upper plate 22 is provided with the upper plate 12 according to the first embodiment.
Almost in the same way, the front side has an almost triangular shape with an acute angle,
At its front end, a boss member 22A and a pin hole 22B are provided as separate members. The upper plate 22 is fixed to the left vertical plate 8 and the right vertical plate 9 from the outside in the left and right directions by fillet welding, and is fixed to the front connecting vertical plate 10 from the outer peripheral side by fillet welding. . However, the upper plate 22 according to the first embodiment is different from the later-described closing plate 23 in that the closing plate 23 is welded to the rear edge 22C. 12 is different.

Reference numeral 23 denotes a closing plate provided on the rear side of the upper plate 22 as a separate member from the upper plate 22.
2 extends obliquely downward from the rear to the rear. The closing plate 23 has an upper side portion 23A having a rear edge 2 of the upper plate 22.
2C, and the lower side portion 23B reaches the upper surface of the frame substrate 6. Also, the left side 23C of the closing plate 23
Extends obliquely along the left vertical plate 8, and the right side portion 23 </ b> D extends straight forward and rearward along the right vertical plate 9. Thus, the closing plate 23 is formed in a trapezoidal shape as a whole.

The closing plate 23 has its upper side 23A butt-welded to the rear edge 22C of the upper plate 22, and the lower side 23A.
B is fillet welded to the upper surface of the frame substrate 6. The left side 23C of the closing plate 23 is fillet welded inside the left vertical plate 8, and the right side 23D is fillet welded inside the right vertical plate 9.

Thus, in the revolving frame 21 according to the present embodiment configured as described above, the above-described first frame is also provided.
Almost the same operation and effect as those according to the embodiment can be obtained. However, according to the present embodiment, the upper plate 22
And the closing plate 23 are formed by separate members, so that the upper plate 22 and the closing plate 23
The material, plate thickness, etc. can be individually selected, and the degree of freedom in designing can be improved.

Next, FIGS. 12 to 14 show a third embodiment of the present invention.
Is shown. The features of this embodiment are:
By bending a single plate extending in the front and rear directions at two positions in the length direction, a rear substrate located on the rear side and corresponding to the rear portion of the frame substrate is interposed between the two bent portions. Is formed integrally with a closing plate portion corresponding to the closing plate and an upper plate portion positioned on the front side and corresponding to the upper plate. Further, a front substrate corresponding to the front portion of the frame substrate is formed by a separate member, and the front substrate is welded to the front side of the rear substrate. In the present embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 31 denotes a revolving frame according to the present embodiment. As shown in FIGS. 12 and 13, the revolving frame 31 includes a board-closing plate-upper plate 32, an integrated vertical plate 36, and a front part, which will be described later. It is substantially constituted by the substrate 40.

Reference numeral 32 denotes a board-closing plate-top plate combined plate. As shown in FIG. 14, the shared plate 32 is made of a single thick steel material, It is constituted by a plate portion 35. The board-closing plate-upper plate 32 is composed of a single steel plate extending in the front and rear directions, a front bending line C2 located at the middle in the longitudinal direction, and a rear side of the front bending line C2. At the rear bending line C3, which is located at the right side of FIG. As a result, the rear side from the rear bending line C3 becomes the rear substrate 33, the space between the front bending line C2 and the rear bending line C3 becomes the closing plate part 34, and the front side from the front bending line C2 becomes the upper plate part. 3
It is 5.

Reference numeral 33 denotes a rear substrate which is located on the rear side of the substrate-closing plate-upper plate 32 and corresponds to the rear portion of the frame substrate. It is formed on the rear side from the line C3. Also, the rear substrate 33
On the front side, a front mounting end 33 to which a front substrate 40 to be described later is fixed is located on both left and right sides of the rear bending line C3.
A, 33A are provided.

Reference numeral 34 denotes a closing plate portion corresponding to a closing plate integrally provided on the front side of the rear substrate 33. The closing plate portion 34
The combined plate 32 is provided at a portion between the front bending line C2 and the rear bending line C3. In addition, the closing plate portion 34
The upper plate portion 35 extends obliquely downward from the rear to the rear side, and its left side portion 34A and right side portion 34B are welded to the below-described left vertical plate 37 and right vertical plate 38 from above.

An upper plate portion 35 corresponds to an upper plate integrally provided on the front side of the closing plate portion 34. The upper plate portion 35 is the same as the upper plate portion 12 according to the first embodiment. Combined plate 32
Of the front side from the front bending line C2, and has a boss member 35A and a pin hole 35B.

Reference numeral 36 denotes an integrated vertical plate according to the present embodiment. The integrated vertical plate 36 is, like the integrated vertical plate 7 according to the first embodiment, formed integrally using a thick steel material. Vertical plate 3
7, a right vertical plate 38 and a front connecting vertical plate 39.

Then, the rear portions of the left vertical plate 37 and the right vertical plate 38 are welded to the upper surface of the rear substrate 33,
The front portions of the left vertical plate 37, the right vertical plate 38, and the front connecting vertical plate 39 are welded to the lower surface of the upper plate portion 35 and the upper surface of a front substrate 40 described later. A left side portion 34A and a right side portion 34B of the closing plate portion 34 are welded inside the left vertical plate 37 and the right vertical plate 38, respectively.

A front substrate 40 is provided on the front side of the rear substrate 33 and corresponds to a front portion of the frame substrate. The front substrate 40 is also formed using a thick steel material. And
The front substrate 40 has a triangular shape substantially in the same manner as the front portion of the frame substrate 6 according to the first embodiment, and has a boss member 40.
A, a pin hole 40B is provided. Also, the front substrate 4
0 is rear mounting ends 40C, 40C, and the rear mounting ends 40C, 40C are front mounting ends 33 of the rear substrate 33.
A and 33A are fixed by butt welding or the like.
Further, a front portion of the left vertical plate 37 and the right vertical plate 38 and a front connecting vertical plate 39 are welded to the upper surface of the front substrate 40.

Thus, also in the revolving frame 31 according to the present embodiment having the above-described structure, the first frame described above can be used.
Almost the same operation and effect as those according to the embodiment can be obtained. However, according to the present embodiment, the rear substrate 33, the closing plate portion 34, and the upper plate portion 35 are integrally formed to provide the board-closing plate-upper plate 32. This allows
Since the load applied to the upper plate portion 35 can be smoothly transferred to the rear substrate 33 via the closing plate portion 34, the load can be received by the rear substrate 33 having strength, and durability can be further improved. It can be further improved.

Next, FIGS. 15 and 16 show a fourth embodiment of the present invention.
Is shown. The feature of the present embodiment is that the left vertical plate is formed by joining a front left vertical plate on the front side from the middle position in the front and rear directions and a rear left vertical plate on the rear side from the middle position, and The plate is formed by joining a front right vertical plate on the front side from the middle position in the front and rear directions and a rear right vertical plate on the rear side from the middle position. In the present embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 51 denotes a turning frame according to the present embodiment,
52 is an integral vertical plate of the revolving frame 51,
2 is composed of a left vertical plate 53, a right vertical plate 54, and a front connecting vertical plate 55 in substantially the same manner as the integrated vertical plate 7 according to the first embodiment.

However, the left vertical plate 53 according to the present embodiment
15 and 16 are formed by welding a front left vertical plate 53A on the front side from the position of the closing plate portion 13 and a rear left vertical plate 53B on the rear side from the position of the closing plate portion 13. Have been. The right vertical plate 54 is formed by welding a front right vertical plate 54A on the front side from the position of the closing plate portion 13 and a rear right vertical plate 54B on the rear side from the position of the closing plate portion 13. In these respects, the left vertical plate 53 and the right vertical plate 54
This is different from the embodiment.

Thus, also in the revolving frame 51 according to the present embodiment thus configured, the first
Almost the same operation and effect as those according to the embodiment can be obtained. However, according to the present embodiment, the left vertical plate 5
3 is formed by a front left vertical plate 53A and a rear left vertical plate 53B, and a right vertical plate 54 is a front right vertical plate 54A and a rear right vertical plate 54.
B, for example, each vertical plate 53A,
The material, plate thickness, etc. of 53B, 54A, 54B can be individually selected, and the degree of freedom in designing can be improved.

In the first embodiment, the left vertical plate 8,
The right vertical plate 9 and the front connecting vertical plate 10 have been described as an example in which the right vertical plate 9 and the front connecting vertical plate 10 are integrally formed as an integrated vertical plate 7 made of one plate body.
The present invention is not limited to this. For example, as in a revolving frame 61 according to a modified example shown in FIG. 17, the front connecting vertical plate is omitted, and a left vertical plate 62 and a right vertical plate 63 are provided separately and It may be configured to open. This configuration can be similarly applied to the second to fourth embodiments.

In the first embodiment, the closing plate 1
Although 3 has been described as being provided obliquely downward from the rear portion of the upper plate portion 12 toward the rear side, the present invention is not limited to this. For example, the closing plate portion may be provided substantially vertically. Further, a configuration may be adopted in which the upper plate portion 12 is inclined obliquely downward toward the front side. This configuration can be similarly applied to the second to fourth embodiments.

Further, in each of the embodiments, the turning frame of the crawler type hydraulic shovel has been described as an example of the turning frame of the construction machine. However, the present invention is not limited to this. May be applied to a revolving frame of a construction machine.

[0076]

As described above in detail, according to the first aspect of the present invention, the revolving frame of the construction machine includes a frame substrate formed of a plate body extending forward and rearward, and a left side of an upper surface of the frame substrate. A left vertical plate positioned forward and rearward and welded to the frame substrate; a right vertical plate positioned rightward of the upper surface of the frame substrate and extending forward and rearward and welded to the frame substrate; An upper plate positioned on the front side of the frame substrate and welded to the upper portion of each of the vertical plates, and at least left and right edges to close a gap between the rear position of the upper plate and the frame substrate. And a closing plate welded to the left and right vertical plates.

Therefore, the frame substrate, the left vertical plate, the right vertical plate,
Close the box structure consisting of the upper plate with the closing plate,
Since the closed box structure can be used, the rigidity against impact or the like can be increased. In addition, by increasing the rigidity by the closing plate, for example, when welding the upper plate and the closing plate, sufficient rigidity can be obtained only by welding from the outside, where the welding operation is simple. As a result, the upper plate and the closing plate need only be externally welded to the left vertical plate and the right vertical plate, and thus can be easily welded using, for example, a welding robot. Thereby, workability related to the welding operation can be improved, and the manufacturing cost can be reduced.

According to the second aspect of the present invention, one plate body extending in the front and rear directions is bent at an intermediate position in the longitudinal direction, so that the front side from the bent portion corresponds to the upper plate. And the rear side from the bent portion is formed as a closing plate portion corresponding to a closing plate, and the lower end portion of the closing plate portion is welded to the upper surface of the frame substrate. By simply bending, an upper plate portion corresponding to the upper plate and a closing plate portion corresponding to the closing plate can be formed. Thereby, welding work for welding the upper plate and the closing plate can be omitted, and the manufacturing cost can be reduced.

According to the third aspect of the present invention, the upper plate and the closing plate are formed by separate members, and the upper end of the closing plate is welded to the rear of the upper plate, and the lower end is welded to the upper surface of the frame substrate. Since the upper plate and the closing plate can be formed by different members, for example, the material of the upper plate and the closing plate, the plate thickness, and the like can be individually selected, and the degree of freedom at the time of design can be increased. Can be improved.

According to the fourth aspect of the present invention, a single plate extending in the front and rear directions is bent at two positions in the length direction, thereby being located on the rear side and corresponding to the rear portion of the frame substrate. The rear substrate to be formed, the closing plate portion located between the two bent portions and corresponding to the closing plate, and the upper plate portion located on the front side and corresponding to the upper plate are integrally formed, and the front side of the frame substrate is formed. The front substrate corresponding to the portion is formed by a separate member, and the front substrate is welded to the front side of the rear substrate.

Accordingly, it is possible to form the upper plate portion corresponding to the upper plate and the closing plate portion corresponding to the closing plate only by bending one plate body, and to weld the upper plate and the closing plate. Work and the like can be omitted. In addition, the load acting on the upper plate can be smoothly transferred to the rear substrate via the integrally formed closing plate, and this load can be received by the rear substrate having strength, and durability can be improved. Can be further improved.

According to the fifth aspect of the present invention, the left vertical plate includes
It is formed by joining a front left vertical plate on the front side from the middle position in the rear direction and a rear left vertical plate on the rear side from the middle position, and the right vertical plate is formed from the middle position in the front and rear directions and the front part on the front side. It is formed by joining the right vertical plate and the rear right vertical plate from the middle position to the rear right vertical plate, so the front left vertical plate, rear left vertical plate, front right vertical plate and rear right vertical plate are separated. Since it can be formed by a member, for example, the front left vertical plate, the rear left vertical plate, the front right vertical plate, the material of the rear right vertical plate, the thickness of the plate can be individually selected,
The degree of freedom at the time of design can be improved.

According to the sixth aspect of the present invention, a front connecting vertical plate is provided between the front portion of the left vertical plate and the front portion of the right vertical plate to integrally connect the two. The front side between the left and right vertical plates is closed, so that the left vertical plate and the right vertical plate can be formed only by bending one plate, thereby reducing the manufacturing cost. Can be. In addition, it is possible to form a closed box structure which is substantially closed by the frame substrate, the left vertical plate, the right vertical plate, the front connecting vertical plate, the upper plate, and the closing plate, and can further increase the rigidity.

According to the seventh aspect of the present invention, since the closing plate is disposed to be inclined forward and backward, the closing plate can be formed long within the height of the vertical plate. The closing plate can be welded to the left vertical plate and the right vertical plate with a long welding distance. Thereby, for example, the rigidity against an impact during excavation work can be increased, and the durability and reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a front view showing a hydraulic excavator applied to a first embodiment of the present invention.

FIG. 2 is a plan view showing the hydraulic shovel in a state where a working device is omitted.

FIG. 3 is a plan view showing a turning frame.

FIG. 4 is a plan view showing the turning frame in a state where a cab support plate, a tank support plate, and the like in FIG. 3 are omitted.

FIG. 5 is a front view of the revolving frame as viewed from a direction indicated by arrows VV in FIG. 4;

FIG. 6 is an external perspective view showing an upper plate-closing plate combined plate and an integrated vertical plate.

FIG. 7 is a left side view of the revolving frame as viewed from the direction of arrows VII-VII in FIG. 4;

FIG. 8 is an enlarged plan view of a main part showing a front part of the revolving frame in an enlarged manner.

FIG. 9 is an enlarged sectional view of a main part of the front portion of the revolving frame as viewed from the direction of arrows IX-IX in FIG. 8;

FIG. 10 is a plan view showing a swivel frame according to a second embodiment of the present invention.

FIG. 11 shows the front part of the revolving frame by arrows XI-XI in FIG.
It is the principal part expanded sectional view seen from the direction.

FIG. 12 is a plan view showing a turning frame according to a third embodiment of the present invention.

FIG. 13 is a front view of the revolving frame as viewed from a direction indicated by arrows XIII-XIII in FIG. 12;

FIG. 14 is an external perspective view showing a substrate-closing plate-upper plate, an integrated vertical plate, and a front substrate.

FIG. 15 is a front view showing a turning frame according to a fourth embodiment of the present invention.

FIG. 16 is an external perspective view showing a single integrated vertical plate.

FIG. 17 is a plan view showing a turning frame according to a modification of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving structure 5,21,31,51,61 Revolving frame 6 Frame board 7,36,52 Integrated vertical plate 8,37,53,62 Left vertical plate 9,38,54,63 Right vertical plate 10, 39, 55 Front connection vertical plate 11 Upper plate-closing plate combined plate 12, 35 Upper plate portion (upper plate) 13, 34 Closing plate portion (closing plate) 22 Upper plate 23 Closing plate 32 Substrate-Closing plate-Upper Combined plate 33 Rear substrate 40 Front substrate 53A Front left vertical plate 53B Rear left vertical plate 54A Front right vertical plate 54B Rear right vertical plate C1 bending line C2 front bending line C3 rear bending line

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kazunori Yamada 1-2 Sasagaoka, Mizuguchi-machi, Koka-gun, Shiga Prefecture Inside the Shiga Plant of Hitachi Construction Machinery Tierra (72) Inventor Norimitsu Sakuma Sasa, Mizuguchi-machi, Koga-gun, Shiga Prefecture 1-2 in Kagamioka, Hitachi Construction Machinery Tierra Shiga Plant (72) Inventor Makoto Makoto 1-2, Sagamigaoka, Minakuchi-cho, Koka-gun, Shiga Prefecture Hitachi Construction Machinery Tierra Shiga Plant (72) Inventor Shogo Kimura 1-2 Sasagaoka, Minakuchi-cho, Koga-gun, Shiga Prefecture Inside the Hitachi Construction Machinery Tierra Shiga Plant

Claims (7)

[Claims] 1. A frame substrate comprising a plate extending in the front and rear directions, and a front substrate positioned on a left side of an upper surface of the frame substrate.
A left vertical plate extending rearward and welded to the frame substrate, a right vertical plate positioned rightward of the upper surface of the frame substrate and extending forward and rearward and welded to the frame substrate, and a front side of the frame substrate; And an upper plate welded to the upper portion of each of the vertical plates, and at least left and right edges of the upper plate are closed with the left and right edges to close a gap between a rear position of the upper plate and the frame substrate. A revolving frame for a construction machine comprising a closing plate welded to a vertical plate. 2. A single plate body extending in the front and rear directions is bent at an intermediate position in a longitudinal direction, so that a front side is formed from the bent portion as an upper plate portion corresponding to the upper plate and folded. The turning frame of a construction machine according to claim 1, wherein a rear side from the bent portion is formed as a closing plate portion corresponding to the closing plate, and a lower end of the closing plate portion is welded to an upper surface of the frame substrate. 3. The upper plate and the closing plate are formed by separate members, and the closing plate has an upper end welded to a rear portion of the upper plate and a lower end welded to the upper surface of the frame substrate. Item 2. A revolving frame for a construction machine according to item 1. 4. A rear substrate, which is located on the rear side and corresponds to a rear portion of the frame substrate, by bending a single plate body extending in the front and rear directions at two positions in the length direction. A closing plate portion corresponding to the closing plate located between the bent portions of the location and an upper plate portion corresponding to the upper plate located on the front side are integrally formed, and correspond to a front portion of the frame substrate. The turning frame of a construction machine according to claim 1, wherein the front substrate to be formed is formed of a separate member, and the front substrate is welded to a front side of the rear substrate. 5. The left vertical plate is formed by joining a front left vertical plate on the front side from a middle position in the front and rear directions and a rear left vertical plate on the rear side from the middle position. 5. The method according to claim 1, wherein the front right vertical plate is formed by joining the front right vertical plate from the intermediate position in the front and rear directions to the front right vertical plate on the front side from the intermediate position in the rear direction. Swirl frame of construction equipment. 6. A front connecting vertical plate is provided between the front portion of the left vertical plate and the front portion of the right vertical plate, and the left and right vertical plates are integrally connected by the front connecting vertical plate. The revolving frame of a construction machine according to claim 1, 2, 3, 4, or 5, wherein a front side between the plates is closed. 7. The revolving frame of a construction machine according to claim 1, wherein the closing plate is disposed to be inclined forward and backward.