JPH0512363Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a swing angle limiting structure for a backhoe.

(b) Conventional technology Conventionally, in the excavation work unit connected to the bucket of a excavator, etc., the boom support at the base end of the excavation work unit is attached to a turning frame protruding from a revolving frame so as to be rotatable left and right. The excavation work is performed by operating the working section using a hydraulic mechanism.

Furthermore, a swing cylinder built into the revolving frame is connected to the side of the boom support via a boom bracket, and the cylinder allows the working section to swing freely 90° to the right and 45° to the left with respect to the revolving frame. , the same Batsukuho was carrying out excavation work in a dead-end alley that it could not enter.

(c) Problems to be solved by the invention However, when a excavator with such a structure is equipped with a cabin, when the excavation work section is operated in a horizontal swing operation, the boom of the work section swings at a wide angle. In order to do this, the excavation work part or the oil supply hose of the hydraulic mechanism interfered with the front glass of the cabin, making it impossible to perform the excavation work smoothly.

(d) Means for solving the problem In this invention, the boom support at the base end of the excavation work section is pivotally supported on the turning frame protruding from the front end of the revolving frame, and the boom support and the boom support are attached to the revolving frame. In a backhoe in which a swing cylinder whose ends are connected to each other is connected via a boom bracket protruding from the side surface of a boom support body so that the working part can freely swing horizontally, the turning frame and the turning frame,
A swing stopper is disposed in the space formed by the boom bracket and a swing cylinder connected to the boom bracket, and a receiving surface is provided integrally with the boom bracket, so that when the boom support body rotates horizontally, the swing stopper It is an object of the present invention to provide a swing angle limiting structure for a backhoe, which is configured such that the excavator and the receiving surface of the boom bracket come into contact with each other to limit the horizontal swing angle of the excavating work part.

(E) Effect In this invention, when the excavating work section is operated in a swing manner, the boom support is operated by a swing cylinder connected via a boom bracket protruding from the side of the boom support at the base end of the work section. It is performed by rotating the body left and right from the pivot point with the turning frame.

At that time, one side of the boom bracket that connects the swing cylinder and the boom support comes into contact with a swing stopper projecting from the side of the turning frame, thereby limiting the horizontal swing angle of the excavating work section.

By limiting the horizontal swing angle by the stopper, the working section avoids interference with the cabin front glass disposed at the upper front end of the revolving frame.

(f) Effects Therefore, according to the present invention, the swing stopper is disposed within the space formed by the turning frame, the boom bracket, and the swing cylinder connected to the boom bracket, thereby making it possible to move the excavating work section. It can be fixed at a constant swing angle, and in such a state, stable excavation work can be performed, and the swing angle of the excavation work part is limited, so interference with the cabin can be avoided and the excavation work part can be moved. It can operate smoothly.

In addition, the space that was traditionally a dead space can be used effectively, and since the swing stopper receiving surface is provided integrally with the boom bracket, it functions as a mounting member for the swing cylinder and can also be used as a swing stopper. It can also function as a contact part, and the layout around the turning frame can be made simple and rational.

Furthermore, since the stopper and the receiving surface are provided in a closed space as described above, it is possible to prevent an accident such as a person's hand being caught, resulting in an extremely safe structure.

(G) Example The example of the present invention will be explained in detail based on the drawings.
In the overall side view of the backhoe shown in Figure 1,
A shows a backhoe, in which a swing base 3 is erected approximately at the center of a traveling frame 2 equipped with a crawler 1, and a swing frame 4 is connected to the base 3 so as to be able to swing left and right. At the rear of the motor unit 5,
The driving units 6 are respectively arranged in the central portions thereof.

Further, the operating section 6 has an operating stand 7 and various operating levers 8 erected thereon.

Note that the backhoe A can also be used with a cabin, and S indicates an imaginary line of the front surface of the cabin provided on the revolving frame 4.

Further, a turning frame 9 is provided protruding from the front end of the turning frame 4, and the turning frame 9 has the following features:
A boom support 11 at the proximal end of the excavating work section 10 is pivotally connected so as to be rotatable left and right.

Note that 12 is a swing cylinder whose base end is connected to the swing frame 4;
is connected to the boom support 11 of the excavation work section 10 to rotate the boom support 11 by 90 degrees left and right.

The excavation work unit 10 has a boom 13, an arm, and a bucket connected to the support 11 from the rear so as to be movable up and down, and performs excavation work using each hydraulic mechanism.

Furthermore, the bucket at the tip of this excavation work section 10 is
For example, it is constructed so that it can be replaced with a breaker for crushing rocks, etc., and the breaker has a removable PTO valve 15 interposed in a position communicating with the hydraulic mechanism of the bucket, and the PTO valve 15 connects the hydraulic pressure with the bucket. It operates by switching.

Note that the return oil from these working parts is returned to the hydraulic oil tank.

The PTO valve 15 is housed inside the front of the rotating frame 4, and a connecting pipe 16 for operating a breaker that communicates with the pipe 15 projects from the front surface 4a of the rotating frame 4.

Furthermore, a connecting pipe 1 for operating the breaker
Reference numeral 6 is provided with a coupler 17 at its tip, and is configured to be able to connect an oil pipe from a breaker to the coupler 17.

Moreover, the backhoe A having such a structure is configured to limit the swing angle, and when the excavating work section 10 is operated to swing 90 degrees, the breaker protruding from the front end of the work section 10 and the swing frame 4 This prevents interference between the connecting pipe 16 for operation, or between the excavating section 10 and the glass on the front surface S of the cabin when the cabin is used.
Therefore, the swing angle limiting structure will be explained in detail as follows.

That is, the swing angle limit of the excavation work unit 10 is achieved by attaching a rectangular swing stopper 18 to the side surface 9-1 of the turning frame 9 that pivotally supports the boom support 11, and connecting the swing stopper 18 and the boom support 11 with each other. This is to limit the horizontal rotation angle by interference.

Moreover, the boom support 11 has
Boom bracket 19 protruding from side 11-2 of
A space Q is formed by the turning frame 9, the boom bracket 19, and the swing cylinder 12 connected to the boom bracket 19.

With such a structure, when the boom support 11 is rotated by the swing cylinder 12, one side of the boom bracket 19 of the boom support 11 is connected to the swing stop protruding from the side of the turning frame 9 within the space Q. It comes into contact with the par 18 and limits the horizontal rotation angle of the boom support 11.

The boom bracket 19 is formed to have a wide shape in a plan view, and is provided with an upright receiving surface 21 at the rear end of the bracket 19, so that when the boom support 11 is rotated, the receiving surface 21 of the bracket 19 is in contact with the tip 18-1 of the swing stopper 18 of the turning frame 9.

In addition, the swing stopper 18 having such a structure
is constituted by a stopper body 23 protruding from substantially the center of a substantially triangular connecting plate 22.

Furthermore, the connecting plate 22 has a plurality of connecting holes 2 on the periphery.
5, and the swing stopper 18 is removably fixed to the side surface of the turning frame 9 with a bolt through the hole 25.

In addition, the swing stopper 18 is connected to the connecting plate 22.
Several types of stopper bodies 23 with different lengths are prepared so that they can be replaced according to the swing angle of the excavating work section 10.

With this structure, the swing operation of the excavating work section 10 is performed by the expansion and contraction operation of the swing cylinder 12 in the drilling frame 4.

At that time, the receiving surface 21 provided at the rear end of the boom bracket 19 on the side surface of the boom support 11 connected to the cylinder 12 is connected to the swing attached to the side surface 9-1 of the turning frame 9 in the space Q described above. It comes into contact with the tip 18-1 of the stopper 18 and limits the swing angle of the excavating section 10.

The excavating section 10 avoids interference with the connecting pipe 16 for operating the breaker protruding from the front end of the rotating frame 4, thereby preventing oil leakage due to damage to the connecting pipe 16.

Therefore, the oil leak-proof connecting pipe 16 can smoothly send oil pressure from the hydraulic pump to the breaker when the breaker to be replaced is operated.

Furthermore, when a cabin is used, the swing stopper 18 prevents interference between the excavating section 10 and the glass on the front surface S of the cabin, and allows the bucket to operate smoothly. In addition, the layout around the turning frame has been simplified,
and can be made reasonable, and
Since the stopper and the receiving surface are provided in a closed space as described above, it is possible to prevent accidents such as people getting their hands caught, and it is possible to provide an extremely safe structure.

[Brief explanation of drawings]

FIG. 1 is an overall side view of the bag hoe of the present invention.
FIG. 2 is a plan view of the pivot of the excavation work section. FIG. 3 is an enlarged side view of the pivot of the excavation work section. Figure 4 is an overall side view of the swing stopper. 4... Rotating frame, 9... Turning frame, 10... Excavation work section, 11... Boom support, 12... Swing cylinder, 18... Swing stopper, 19... Boom bracket.

Claims (1)

[Claims for Utility Model Registration] A boom support 11 at the proximal end of the excavation work section 10 is pivotally supported on a turning frame 9 protruding from the front end of the swing frame 4.
A swing cylinder 12 whose base end is connected to a swing cylinder 12 is connected via a boom bracket 19 protruding from the side surface of the boom support 11, so that the working section 10 can be freely swung horizontally. , a swing stopper 18 is disposed in a space Q formed by a boom bracket 19 and a swing cylinder 12 connected to the boom bracket 19, and a receiving surface 21 is integrally provided on the boom bracket 19, and a boom support 11, the stopper 18 and the receiving surface 21 of the boom bracket 19 come into contact with each other to limit the horizontal swing angle of the excavating work part 10.