JPH0213562Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is based on the boss that connects the swing bracket with the excavation work arm so that it can swing from side to side. Connecting and disconnecting the bracket-side connecting portion installed on the swivel base and provided on the swing bracket side, the swivel-side connecting portion provided on the swivel-side side, and the bracket-side connecting portion and the swivel-side connecting portion. The present invention relates to a swing bracket fixing structure for an excavation vehicle equipped with a swing bracket lock mechanism equipped with a flexible coupling means.

Conventionally, in the above-mentioned excavation work vehicle, to configure the swing bracket fixing structure, as shown in FIG. ,
The bracket side connecting portion 17 formed on the swing bracket 7 and the bracket 10b' were configured to be connected by a link 19 or a lock pin 18 as a connecting means, but the bracket 10b' was formed singly, Since these are connected by welding, the number of parts to be manufactured increases and the number of assembly steps increases, which is disadvantageous in terms of manufacturing. In addition, the swivel table surrounding wall 2, which originally does not have strength,
Since the bracket 10b' is end face welded to the bracket 10b', it is not possible to provide the bracket 10b' with a large support strength, and it is still insufficient in terms of fixing strength for the swing bracket 7 to which a heavy excavation work arm is attached. There was room for improvement.

In view of the above-mentioned circumstances, the purpose of the present invention is to reduce the number of manufacturing parts and assembly man-hours, and to improve the fixing strength of the swing bracket by rationally improving the swing bracket fixing connection part. be.

The characteristic configuration of the swing bracket fixing structure of the present invention is that, in the excavation work vehicle described at the beginning, the swivel platform side connection part is integrally formed with the upper sheet metal, and its functions and effects are as follows. It is.

In other words, we focused on the fact that due to the structure, the upper one of the upper and lower sheet metals exists horizontally near the location where the swivel side connecting part is installed, and by forming an extension part on the upper sheet metal, By integrally forming the swivel base side connection part on the upper sheet metal, the swivel base side connection part can be provided in a predetermined position simply by manufacturing and installing the upper sheet metal, and it is no longer necessary to manufacture a separate bracket as in the conventional configuration.・Compared to assembling products, the number of manufactured parts and assembly man-hours are reduced, and productivity can be greatly improved. Moreover, in order to support the boss against the weight of the excavation work arm, the swivel base side connecting portion is integrally formed with the upper sheet metal which has great strength and is connected and reinforced by the vertical strip metal sheet. Compared to the conventional structure, in which the swivel table side connection part is simply end face welded to the front surface of the swivel table peripheral wall, the support strength of the swivel table side connection part can be greatly improved, and as a result, the swing bracket can be fixed easily. The strength has been greatly improved, and durability and safety have been improved.

Next, embodiments of the present invention will be described in detail based on illustrative drawings.

As shown in FIG.
It is installed so that it can be rotated freely around P ₁ , and its swivel base 2
is provided with an operation cabin 3 and a driving unit 4, and an excavation work arm 6 which is capable of vertically swinging and bending/stretching operation and has an excavation bucket 5 attached to its tip.
A dozer device 8, which can be freely oscillated up and down, is attached to the front end of the swivel base ₂ via a swing bracket 7 that can be freely swung left and right about the vertical axis P2, and a dozer device 8 that can be swung up and down, is attached to the front end of the machine base. It is configured as an excavation work vehicle capable of soil removal work.

To configure the mounting structure of the swing bracket 7, as shown in FIGS. 2 to 4, a pair of left and right vertically oriented strip metal plates 9 are attached to a strength frame approximately in the center of the left and right sides of the swivel base 2 in a state extending back and forth. A pair of upper and lower sheet metal parts 1 are arranged as a metal sheet metal strip 9, and have bracket-like extensions 10a and 11a formed at their tips, extending over the upper and lower surfaces of the front end portions of the metal strips 9, respectively.
0 and 11 are welded together, and the vertical boss 12 for pivoting the swing bracket is extended over the upper and lower bracket-like extensions 10a and 11a, and the outer circumferential surface of the boss 12 is connected to the left and right sides. While in contact with the tip of the strip-shaped sheet metal 9, it is welded and connected to the upper and lower sheet metals 10, 11 and the strip-shaped sheet metal 9 serving as a strength frame, thereby providing sufficient strength to resist the weight of the working arm 6. Boss 1 when prepared
2 is connected and supported on the swivel base 2.

and a pivot connection portion for the arm 6, and
The swing bracket 7, which is provided with a pivot connection portion for the hydraulic cylinder 13 for vertically swinging the arm and is formed into a substantially U-shape in side view, is fitted above and below the boss 12, and the swing bracket 7 and the boss 12 are connected to each other. While inserting the pivot pin 14,
A hydraulic cylinder 16 is installed across the cylinder bracket 15 formed on the side of the swing bracket 7 and the swivel frame.
The swing bracket 7 is configured to swing left and right with respect to the swivel base 2.

On the side opposite to the left-right swinging hydraulic cylinder 16, a bracket-side connecting portion 17 with one pin hole is integrally formed on the side of the swing bracket 7, and on the swivel base 2 side, the upper and lower sheet metal 1
The upper sheet metal 10 of 0 and 11 is provided with a swivel-side connecting portion 10b having two pin holes arranged side by side on the left and right,
integrally formed with the sheet metal 10 to form an extension part,
In addition, a connecting link 19 having a pin hole formed at the tip end and a longitudinally intermediate portion is connected to the swivel base side connecting portion 10.
A swing bracket lock mechanism is constructed by connecting a pin 18a to the outer pin hole b. That is, as shown by the solid line in FIG.
The swing bracket 7 is connected to the swivel base 2 by connecting the middle pin hole of the swing bracket 7 to the bracket side connecting portion 17 with the pin 18b and connecting the swivel base side connecting portion 10b and the bracket side connecting portion 17 with the connecting link 19. so that it can be fixed in a non-swinging state,
Further, as shown by the solid line in FIG. 3, the connecting link 19
Connect the tip pin hole and the bracket side connecting part 17 with pin 1.
8b and the swivel base side connecting portion 10b and the bracket side connecting portion 17 are connected by a connecting link 19, so that the swing bracket 7 can be fixed at the right swing position. Furthermore, the third
As shown by the imaginary line in the figure, the swivel base side connecting portion 10b
The swing bracket 7 can be moved to the left swing position by directly connecting the inner pin hole of the bracket side connecting part 17 with the pin 18c and connecting the swivel base side connecting part 10b and the bracket side connecting part 17 with the pin 18c. It is designed to be fixed. and,
By removing the connecting pin 18b or 18c, the connecting link 19 or the connecting pin 18c is switched to a disconnected state, thereby allowing the swing bracket 7 to swing.

On the swivel base side, a connecting bracket 20 with one pin hole is located at the side end of the swivel base 2 and connected to the swivel base peripheral wall 21 by welding. pin 1
By connecting the connecting links 8b, the unused connecting links 19 can be stored compactly, as shown by the imaginary lines in FIG.

In summary, by integrally forming the swivel base-side connecting portion 10b for fixing the swinging motion of the swing bracket 7 using the upper sheet metal 10 for supporting connection to the boss, the number of structural members can be reduced and , the fixing strength of the swing bracket 7 is improved.

In addition, the upper and lower sheet metal 1 for connecting and supporting the boss 12
Various improvements can be made to the specific shape and arrangement of the swing brackets 0, 11, and the strip-like sheet metal 9, and the specific shape of the swing bracket 7 can also be improved in various ways.

Further, the specific shape of the swivel-side connecting portion 10b integrally formed with the upper sheet metal 10 can be modified in various ways instead of being formed into a bracket shape as described above.
Furthermore, the swing bracket 7 of the connecting portion 10b
The specific connection structure and the number of fixed connection stages can be changed in various ways.

The present invention is intended for various types of excavation work vehicles equipped with various excavation work arms, such as backhoe work vehicles and front shovel work vehicles.

[Brief explanation of the drawing]

The drawings show an embodiment of the swing bracket fixing structure for an excavation vehicle according to the present invention, and FIG. 1 is an overall side view of the excavation vehicle, and FIGS. 2 and 3 are enlarged plan views showing the swing bracket mounting structure, respectively. FIG. 4 is an enlarged side view of the same, and FIG. 5 is an enlarged perspective view showing the conventional structure. 2... Swivel base, 6... Arm for excavation work, 7...
...Swing bracket, 9...Striped sheet metal, 10,
11... Upper and lower sheet metal, 10b... Swivel base side connection part,
17... Bracket side connection part, 19, 18c...
Connection means, 12...Boss.

Claims (1)

[Scope of utility model registration request] A boss 12 axially connects a swing bracket 7 to which an arm 6 for excavation work is attached so that it can swing left and right.
Upper and lower sheet metals 10, 11 and both sheet metals 10, 1
It is attached to the swivel base 2 by a vertically oriented belt-shaped sheet metal 9 that connects the brackets 1 to 1, and includes a bracket-side connecting portion 17 provided on the swing bracket side, a swivel-side connecting portion 10b provided on the swivel base side, and the bracket. In an excavation work vehicle equipped with a swing bracket lock mechanism that is equipped with a connecting means 19 or 18c that can connect and disconnect the side connecting portion 17 and the swivel-side connecting portion 10b, the swivel-side connecting portion 10b is connected to the upper side. A swing bracket fixing structure for an excavating vehicle integrally formed with the sheet metal 10.