JPS6029503Y2 - Backhoe intermediate boom structure - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an intermediate boom structure of a backhoe.

In this design, a mounting plate for mounting a hydraulic cylinder for packet operation is installed upright at the base end of the intermediate boom of a backhoe. The welding process is simplified by welding the mounting plate to the intermediate boom.
It is also an object of the present invention to provide an intermediate boom structure for a backhoe that has increased strength by increasing the penetration of welding, and which enables a rigid intermediate boom and a hydraulic cylinder to be connected in series.

If we explain the embodiment of this invention in detail based on the drawings, A indicates a backhoe, and the lower part of the machine body a has a running section 1.
The aircraft body a is capable of turning freely via a turntable on the running section 1, and the aircraft body a is provided with a cabin 2 having a driver's seat and a driving section 3. .

In addition, an abbreviated main boom 4 whose lower end is pivotably connected to the front end of the fuselage a and is freely rotatable is connected to the front end of the fuselage a, and the main boom 4 is rotated by a first hydraulic cylinder 5. perform motion operations.

The base end of an intermediate boom 6 is pivotally attached to the tip of the main boom 4 via a pin, and a bushing boss 8 is welded to the lower end of the intermediate boom 6 having an opening in cross section. Ori,
A bushing boss 11 having a grease passage 10 is fitted into the bushing boss 8.

At the upper part of the base end of the intermediate boom 6, there is a mounting plate 14 for pivotally supporting 13 the base end of the third hydraulic cylinder 12 for packet operation.
are installed vertically on the left and right, and the lower end of the mounting plate 14 is connected to the side plate 6-1 and the upper plate 6-1 of the intermediate boom 6, which has an opening in cross section.
2, and welded between the outer surface of the lower end of the mounting plate 14 and the bent portion 6, and the inner surface of the lower end of the mounting plate 14 and the upper plate 6. -2 are welded together.

A base end plate 15 is welded to the base end surface of the intermediate boom 6 in an inclined manner. A rod mounting plate 18 for mounting the tip of the piston rod 17 of the second hydraulic cylinder 16 for rotating the intermediate boom 6 about the pivot joint 7 is provided upright on the plate 15; The tip of the piston rod 17 of the second hydraulic cylinder 16 is pivotally attached 19 to 18 .

The rear end edge of the mounting plate and the front end edge of the rod mounting plate 18 are welded together in a butt-like manner with the extending portion 15' of the base end plate 15 interposed therebetween.

A packet 20 is rotatably connected to the tip of the intermediate boom 6 by a link mechanism 21, and the link mechanism 21 is connected to the tip of the piston rod of the third hydraulic cylinder 12. There is.

The embodiment of this invention is constructed as described above, and the mounting plate 14 for mounting the third hydraulic cylinder 12 connected to the base end of the intermediate boom 6 is connected to the bent portion 6 of the intermediate boom 6.
-3, since the welding is done covering the bent part 6-3, the welding area is large, and the amount of welding is larger than when the lower end of the mounting plate is welded on a mere flat surface. The amount of weld penetration during welding is large, the welding strength is strong, and the strength of the mounting plate 14 can be increased, which is particularly important for the third hydraulic cylinder in the intermediate boom 6, which is heavily loaded during operation. This makes it possible to strengthen the pivot portion of the base of 12 and prevent damage as much as possible.

In addition, the rod mounting plate 18 and the mounting plate 14 are connected to the base end plate 15.
Since they are welded together in abutted state with
．． The stress applied to the boom 6 is distributed over the entire base end of the boom 6 via the mounting plates 18 and 14, resulting in an advantageous structure in terms of strength.

Furthermore, all the connecting parts of the members constituting the intermediate boom 6 are constructed so that their surfaces are perpendicular to each other, so that all the parts can be assembled by fillet welding during welding assembly. It eliminates the need for groove cutting work for welding, reducing the manufacturing process.

According to this invention, the mounting plate for attaching the base end of the third hydraulic cylinder installed upright at the base end of the intermediate boom of the backhoe is welded at the upper end mark of the intermediate boom, making it easy to weld. The welding depth is large, and the strength is therefore strong, allowing the mounting plate to be firmly connected and preventing damage to the connecting part between the base end of the third hydraulic cylinder and the intermediate boom due to work load as much as possible. This has the effect of increasing work safety.

[Brief explanation of the drawing]

Fig. 1 is a side view of the backhoe of the proposed structure, Fig. 2 is a side view of the main parts, Fig. 3 is an enlarged sectional view taken along lines I- and I in Fig. 2, and Fig. 4 is Fig. 2 An enlarged cross-sectional view of the line. A...Backhoe, 6...Middle boom, 6-3...Bent part, 14...Mounting plate, m...Welded part , 15... Base end plate, 1
5'...Extension part of base end plate, 18...Rod mounting plate.

Claims (1)

[Scope of utility model registration request] Mounting plate 1 for connecting the base end of the third hydraulic cylinder for packets to the upper end mark 6-3 of the base end of the intermediate boom 6 of backhoe A
The lower end of the boom 6 is erected by welding, and the weld is connected to the lower end of the mounting plate 14 while covering the bent portion 6-3. Base end plate 1
5 are connected in an inclined manner so that the base end surface thereof is closed, and the base end plate 15 is further extended above the upper plate 6-2 of the boom 6 to form an extended portion 15'. The rear edge of the plate 14 is connected to the proximal plate 1.
A piston rod 17 of a second hydraulic cylinder 16 for operating the intermediate boom six times is welded to the upper surface of the extending portion 15' of the base end plate 15 and the lower surface of the extending portion 15'.
A rod attachment plate 18 for attaching the tip is vertically provided, and the upper front edge of the rod attachment plate 18 and the rear edge of the attachment plate 14 are attached via the extending portion 15' of the base end plate. A backhoe intermediate boom structure that is welded together in a mated state.