JPH0454063Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a side frame attachment structure of a swivel base in a special vehicle.

(Prior Art) As a conventional swivel platform structure for a power shovel as a special vehicle, there is one as shown in FIG.

This thing is on the body 2 of the power shovel 1.
A boom 1 is raised and lowered by a hydraulic cylinder 11 on a swivel base 7 supported via swivel bearings 4 and 5.
0, and an arm 12 that is swing-operated by a hydraulic cylinder 13 at the end of the hoisting boom 10.
A bucket belt 15 is pivotally attached to the end of the arm 9 and is pivoted by a hydraulic cylinder 14 via links 16 and 17. After moving the power shovel 1 to the destination, Swinging of the swivel base 7, raising and lowering of the boom 10 due to expansion and contraction of the hydraulic cylinders 11, 13 and 14, arm 12 and butt 1
5 and the movement of the vehicle body 2, the required power shovel work can be performed. In addition, in FIG. 6, 8 is a cabin and 9 is an engine room.

Although not shown, a telescoping boom is provided on the swivel platform of a crane truck as a special vehicle, and a rope is suspended from a sheave at the top of the telescoping boom or a sheave at the top of a jib that is movable at the top. There are also known cranes that use a hook block at the end to handle cargo.

(Problems to be Solved by the Invention) However, in the conventional swivel structure of a power shovel or special vehicle such as a crane, the hydraulic cylinder 11 is connected to the swivel 7 on the moving vehicle body 2. Waving boom 1
0. Power shovel work with the arm 12 and bucket 15 swinging by hydraulic cylinders 13 and 14, the sheave at the top of the telescopic boom that rises and falls on a similar rotating platform, and/or the sheave at the top of the jib that rises and falls on the top of the telescopic boom. When carrying out cargo handling work using a hook block at the end of a rope hanging from a
There has been a problem in that the peripheral edge of these swivel bases may come into contact with objects, etc. located around the special vehicle and apply an impact force, causing damage to the objects and the special vehicle.

In view of such conventional examples, this invention inserts the vertical wall end of the cross beam extending laterally from the center frame on the swivel table through a vertical hole in the inner wall of the cylindrical side frame, and By fixing the vertical wall end of the cross beam around the vertically elongated hole of the side frame, it is intended to provide a side frame attachment structure for a swivel base in a special vehicle that does not have the above-mentioned problems.

(Means for Solving the Problems) In order to solve the above-mentioned problems of the conventional technology, this invention replaces the vertical wall ends of the cross beams extending laterally from the center frame on the swivel table with cylindrical sidewalls. The cross beam is inserted into the inside of the frame through a vertical hole in the inner wall thereof, and the end of the vertical wall of the cross beam is fixed around the vertical hole of the cylindrical side frame.

(Function) Since this device has the above-mentioned configuration,
When performing excavation work, crane work, etc. using special vehicles such as power shovels and crane trucks,
Even if the peripheral edge of the swivel base comes into contact with objects, etc. around the special vehicle, the cylindrical side frame provided around the swivel base deforms and absorbs the impact force generated by the contact.

(Example) Hereinafter, one example of the side frame attachment structure of the swivel base in a special vehicle according to this invention will be described in the first example.
This will be explained with reference to the drawings to FIG. Note that the same names and symbols are used for parts common to those in FIG. 6 showing the conventional example.

In the figure, reference numeral 5 indicates a swing bearing supported on the vehicle body 2 of the power shovel 1 (see Fig. 6);
is a base plate on the swing bearing 5, 7 is a swivel base, 21 is a center frame on the base plate 6, 22 is a swing motor mounting seat, 23 is an engine mounting seat, 24 is a cross beam extending from the center frames 21, 21 to both sides. , 25 is a vertical wall end of the cross beam 24, 30 is a cylindrical side frame, 3
1 and 32 are the inner and outer walls thereof, 33 is a vertically elongated hole provided in the inner wall 31, into which the vertical wall end 25 of the cross beam 24 is inserted; It extends into the cylindrical side frame 30, its end edge 25A abuts the inside of the outer wall 32 of the cylindrical side frame 30, and the base of the vertical wall end 25 extends around the vertically elongated hole 33. It is fixed by wearing etc.

Next, the operation of this embodiment will be explained.

First, after moving the power shovel 1 to the target excavation location, the swivel base 7 is rotated, the hoisting boom 10 is raised and lowered by the normal contraction of the hydraulic cylinder 11, and the arm 12 and the bucket 15 are moved by the extension and contraction of the hydraulic cylinders 13 and 14. It is better than the conventional power shovel 1 in that it performs the required power shovel work by swinging etc.
, but in this embodiment, the vertical wall end 25 of the cross beam 24 extending laterally from the center frame 21 is inserted into the cylindrical side frame 30 through the longitudinal hole 33 in the inner wall 31 thereof, The end edge 25A contacts the inside of the outside wall 32 and supports the outside wall 32 of the side frame 30 from inside (however, the end edge 25A and the inside of the outside wall 32 are not welded). At the same time, since the base of the vertical wall end 25 is fixed around the vertically elongated hole 33 of the inner wall 31 by welding or the like, when excavating with the bucket 15, the peripheral edge of the swivel base 7 is When the power shovel 1 collides with obstacles such as objects around the power shovel 1, the cylindrical side frame 30 deforms and absorbs the impact energy, so that no large impact force is generated on the objects or the power shovel 1 body.

Although not shown, the cylindrical side frame 30
A plurality of vertically elongated holes 33 are provided in the inner wall 31 of the center frame 21, and the vertical wall end portions 25 of the plurality of cross beams 24 extending from the center frame 21 are inserted into each of the vertically elongated holes 33, so that the end portions 25A are cylindrical. side frame 3
0 until it abuts the inside of the outer wall 32, and the vertical wall end 25 is welded or the like to form the vertically elongated hole 3.
If fixed around 3, the cylindrical side frame 30
The area around the vertically elongated hole 33 of the inner wall 31 is welded and fixed to the end portions 25 of the plurality of cross beams 24, and
Since the inner side of the outer wall 32 of the cylindrical side frame 30 is supported by the end edge 25A of the vertical wall end 25, the cylindrical side frame 30
Therefore, the torsional rigidity of the swivel base 7 can be increased without increasing the weight of the cylindrical side frame 30.

In the above description, an example of a power shovel was described in which a hoisting boom 10 equipped with an arm 12 with a bucket 15 is mounted on a swivel base 7. The same effect as described above can be expected from the hollow side frame 21 even when a crane is provided with a retractable boom having a hook block (not shown) capable of raising and lowering the crane (not shown).

(Effects of the invention) Since this invention has the above-mentioned configuration and functions, the following effects can be obtained.

(1) The end of the vertical wall of the cross beam inserted through the vertical hole in the inner wall of the cylindrical side frame on the periphery of the swivel table was inserted and fixed around the vertical hole.
During various types of work using special vehicles, even if the periphery of the swivel platform collides with an object such as an object, the impact force will be absorbed by the deformation or destruction of the cylindrical side frame, causing a large impact on the object or the main body of the special vehicle. There is no risk of causing damage.

(2) It is possible to easily select and install a cylindrical side frame with a cross-sectional shape suitable for the type of work and work environment of the special vehicle without changing the structure of the special vehicle itself, especially its cross beam.

(3) By simply extending the end of the vertical wall of the cross beam by an amount corresponding to the thickness of the cylindrical side frame, the mounting structure of this side frame can be easily adapted to the turning of existing special vehicles without changing the rest of the structure. It can be implemented as a peripheral structure of the stand.

(4) Since the end of the vertical wall of the cross beam is fixed around the vertical hole provided in the inner wall of the cylindrical side frame, the external force applied to the cylindrical side frame is effectively dispersed and received. Not only
The torsional rigidity of the cylindrical side frame is increased, and the cylindrical side frame having the same strength can be made relatively thin and lightweight.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an example of a swivel base in which the side frame attachment structure of the swivel base is implemented in a power shovel as a special vehicle according to this invention;
Figures 3 and 3 are cross-sectional views taken along lines A-A and B-B in Figure 1, Figure 4 is a side view of the area around the vertical hole in the inner wall of the cylindrical side frame, and Figure 5 is a sectional view of the cylindrical side frame. FIG. 6 is a plan view of a fixing portion between the cross beam and the end of the vertical wall of the cross beam, and FIG. 6 is a side view of a conventional power shovel. DESCRIPTION OF SYMBOLS 1... Power shovel (special vehicle), 7... Swivel base, 21... Center frame, 24... Cross beam, 25... Vertical wall end, 30... Cylindrical side frame, 31... Inner wall, 32 ...outer wall, 3
3... Vertical hole.

Claims (1)

[Scope of utility model registration request] The end of the vertical wall of the cross beam extending laterally from the center frame on the swivel table is inserted into the inside of the cylindrical side frame through a vertical hole in the inner wall, and the end of the vertical wall of the cross beam is inserted into the cylindrical side frame. A structure for attaching a side frame of a swivel base in a special vehicle, characterized in that the side frame is fixed around a vertical hole in the side frame.