JPH0410295Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a mark for setting the rotation locus of a double-swinging type backhoe.

[Conventional technology]

Conventionally used double-swivel type backhoes have a lower swivel table mounted above the running section so that it can freely turn left and right, and an upper swivel table that is placed above the lower swivel table so that it can turn left and right. The structure was set in place. Then, the upper and lower swivel tables are operated at a speed ratio of 2 to the lower swivel and 1 to the traveling section by hydraulic drive mechanisms located above and below the lower swivel and the upper swivel, respectively. It was designed to be driven so as to rotate. The rotational movement of this ratio causes the tip of the excavation part supported by the upper rotating table to be repeatedly operated on a fixed rotational trajectory.

[Problem that the invention attempts to solve]

However, the upper hydraulic drive mechanism and the lower hydraulic drive mechanism are independent, and there may be errors in the speed ratio between the lower and upper swivel tables due to manufacturing errors and differences in resistance of the supplied hydraulic pressure. This often occurred. When such an error occurs in the speed ratio, the error in the speed ratio is accumulated by repeating the operation of turning the excavation part twice. When the accumulation of these errors increases, a deviation occurs in the relative positions of the upper and lower swivel tables, causing a problem in which the trajectory of the tip of the excavation part gradually deviates from the initial setting conditions.

[Means for solving problems]

In this invention, a viewing pole is erected in front of the driving section placed on the upper swivel table, and a mark is provided on the outer surface of the prime mover section placed on the lower swivel table. After a plurality of turning operations, the upper turning table and the lower turning table can be independently rotated so that the mark and the visibility pole are aligned, and the position can be corrected. By this position correction, the turning locus of the excavation part can be reset, and the present invention provides a mark for setting the turning locus of a double-swinging type excavator that facilitates this work.

[Effect]

In the above structure, the upper swivel table and the lower swivel table are individually rotated, and correction is made so that the visibility pole and the mark are aligned. Through this operation, the cumulative error in the rotation trajectory of the tip of the excavation part can be easily corrected.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

In the figure, the symbol A indicates a double-swivel type backhoe,
At the bottom of this double-swivel type backhoe A, there is a running section 1.
A running frame 2 is provided which is equipped with a crawler. A lower swivel base 3 is mounted approximately in the center of the traveling frame 2, and a lower swivel base 4 is mounted on the upper surface of the lower swivel base 3 so as to be freely pivotable in the left and right direction. A body frame 5 is integrally fixed to the stand 4. Furthermore, an upper swivel base 6 is mounted on the front part of the upper surface of the lower swivel base 4.
An upper swivel base 8 is mounted on the upper part of the upper swivel base 6 so as to be freely rotatable in left and right directions. The excavating section B and the driving section 7 are mounted on the upper swivel table 8.

An upper swing hydraulic motor 9 that can freely rotate forward and backward is interposed between the upper swing base 8 and the upper swing base 6, and between the lower swing base 4 and the lower swing base 3, there is a motor that can rotate forward and backward. A free downward swing hydraulic motor 10 is interposed. Hydraulic pressure is independently supplied to the upper swing hydraulic motor 9 and the lower swing hydraulic motor 10 from a first hydraulic pump 12 and a second hydraulic pump 13 provided in a prime mover section 11 mounted at the rear of the aircraft frame 5. There is. The discharge amounts from the first hydraulic pump 12 and the second hydraulic pump 13 are set so that the ratio thereof is 2:1. For this reason, the first hydraulic pump 12, the second hydraulic pump 1
The rotation speed ratio of the upper swing hydraulic motor 9 and the lower swing hydraulic motor 10, which are driven by the hydraulic pressure supplied from the pump 3, is 2:1.

In order to control the turning operations of the upper swivel table 8 and the lower swivel table 4, an operating lever 15 is provided on the driving section 7. By operating this operating lever 15, the first hydraulic pump 12 and the upper swing hydraulic motor 9
During this period, the hydraulic control valve 16 interposed between the second hydraulic pump 13 and the lower swing hydraulic motor 10 is controlled. In normal operation of the operating lever 15, the upper swing hydraulic motor 9 and the lower swing hydraulic motor 10 can be rotated while being synchronized at a ratio of 2:1. In addition, if correction is required, a switching lever 1 interposed in the hydraulic pressure transmission path may be used.
By switching 7, the upper swivel base 8 and the lower swivel base 4 can be independently operated using the operating levers 15, respectively. Therefore, the switching lever 17 can be used to select between interlocking and independent operation.

In addition, the hydraulic control valve 16 and the upper swing hydraulic motor 9
An upper selector valve 18 is interposed between the hydraulic control valve 16 and the lower swing hydraulic motor 10, and a lower selector valve 19 is interposed between the hydraulic control valve 16 and the lower swing hydraulic motor 10.
By switching the upper selector valve 18 and the lower selector valve 19, the rotating directions of the upper rotating table 8 and lower rotating table 4 can be individually switched to normal rotation or reverse rotation.

With such a mechanism, by operating the operating lever 15, the upper swivel base 8 and the lower swivel base 4 can be moved in the same direction at the same time.
Alternatively, it can be rotated in the opposite direction.
In addition, by switching the switching lever 17,
The upper swivel base 8 and the lower swivel base 4 can be independently rotated in forward and reverse directions.

Next, a driver's seat 7' on which a driver rides is placed in the driver's section 7, and a viewing pole 20 is fixed to the front of the driver's seat 7'. This viewing pole 20 is fixed vertically to the front part of the driver's seat 7, and is positioned in front of the driver seated on the driver's seat 7'. Further, a mark 22 for positioning is fixed on the outer surface 11' of the prime mover 11 facing the upper swivel table 8 (i.e., the center of the front side of the prime mover cover 21). .

Now, set the switching lever 17 to the synchronous side,
By operating the operating lever 15, the upper swivel base 8 and the lower swivel base 4 can be rotated simultaneously. In this synchronous turning operation, if the excavation part B is made to double turn many times, the positions of the upper turning table 8 and the lower turning table 4 may become misaligned. When errors accumulate due to this long-term operation, a phenomenon occurs in which the upper swivel base 8 faces diagonally from the front even when the lower swivel base 4 faces forward (the state shown in Fig. 1 is the case where the upper swivel base 8 , both of the lower swivel bases 4 are shown facing the same forward direction). When such an accumulation of errors occurs, the excavating section B cannot be positioned in front of the traveling frame 2, and the excavating work cannot be performed normally. If this situation occurs, you will need to perform an operation to correct the position.

In this correction operation, first operate the switching lever 17 to change the hydraulic pressure transmission path, and then
The lower swivel bases 4 are set to rotate independently. In this state, the operating lever 15 is operated to supply hydraulic pressure only to the upper swing hydraulic motor 9, and only the upper swing stand 8 is turned while the lower swing stand 4 is stopped. For this reason, the upper swivel table 8 faces the direction of the prime mover 11 as shown in FIG.
Rotate to face 1. When this happens, the upper swivel base 8 is rotated to a position where the line of sight line of sight of the driver sitting on the driver's seat 7' matches the line of sight pole 20 and the mark 22, and the upper swivel base 8 is temporarily stopped at that position. let This outlook pole 2
The position where 0 and the mark 22 match becomes the starting point for synchronization of the upper swivel base 8 and the lower swivel base 4.

In this way, the visibility pole 20 and the mark 22
The switching lever 17 is returned to its original position at the same position, and hydraulic pressure is simultaneously supplied to the upper swing hydraulic motor 9 and the lower swing hydraulic motor 10 to operate them synchronously. As mentioned above, since the synchronization start points are corrected and matched, the upper swivel base 8 and the lower swivel base 4
rotate in synchronization at a ratio of 2:1, and when the lower swivel table 4 faces forward, the upper swivel table 8 also faces in the same direction.

As described above, if the double-swivel type excavator A is used for a long period of time and the excavation part B is reciprocated in front and back of the traveling frame 2, errors will occur in the positions of the upper swivel table 8 and the lower swivel table 4. This error can be corrected by the sight pole 20 and the mark 22. Therefore, the upper swivel table 8 and the lower swivel table 4 can be rotated at a ratio of 2:1, and the direction of synchronization can be corrected. For this reason, the double-swivel type backhoe A
Even if the direction in which the excavated part B is oriented deviates during repeated movements, the direction of the excavated part B can be easily restored to the normal direction by the above correction operation.

Through the above-mentioned mechanism, the path of the hydraulic pressure supplied to the upper swing hydraulic motor 9 and the lower swing hydraulic motor 10 is the upper selector valve 18 and the lower selector valve 1.
9. Depending on the setting of the switching lever 17, there are nine types of combinations, and it is possible to select and operate from among these combinations of hydraulic paths, and the upper swivel base 8 and the lower swivel base 4 can be freely moved. can.
As a typical movement of this combination, the upper swivel table 8,
There is an excavation movement in which the lower swivel table 4 is rotated in the opposite direction and the rotation ratio of both is 2:1. As mentioned above, the excavation part B is held by the upper swivel table 8 and the lower swivel table 4, so it rotates twice.
The trajectory drawn by the bucket 23 provided at the tip of the lower swivel base 4 is an ellipse. Then, the axis of the major axis of this elliptical trajectory coincides with the linear direction of the front and back of the upper swivel base 8 when the sight pole 20 and the mark 22 coincide.

〔effect〕

According to this invention, by providing a visibility pole and a mark on a double-swivel type backhoe, it is possible to easily correct and reset the cumulative synchronization error that occurs while the upper slewing platform is double-swiveled. It is something that can be done.

[Brief explanation of the drawing]

Fig. 1 is an overall plan view of a double-swivel type backhoe having a mark for setting a rotation trajectory, which is an embodiment of the present invention, Fig. 2 is a side view of the same, and Fig. 3 is a plane explaining the operation of the same. It is a diagram. A...Double rotation type backhoe, B...Excavation section,
DESCRIPTION OF SYMBOLS 1... Traveling part, 4... Lower swivel base, 8... Upper swivel base, 11... Prime mover part, 11'... Outer side of the same,
20... outlook pole, 22... mark.

Claims (1)

[Claims for Utility Model Registration] A lower swivel base 4 is pivotably supported above the traveling section 1 so as to be rotatable left and right, and an excavation section B is further provided above the lower swivel base 4.
In the double-swing type backhoe A, which is constructed by connecting an upper swivel base 8 that supports a driving unit 7 so as to be rotatable left and right, a swivel base that can be moved by disposing crawler running parts on the left and right sides; The lower swivel table is rotatably placed on the swivel base, the upper swivel table is rotatably placed on the lower swivel table, and the excavation section and operation are placed in parallel on the upper swivel table. In a double-swivel type backhoe consisting of a part and a part, a viewing pole 20 is erected at the front part of the driving part 7, and a prime mover part 11 is installed on the lower swivel base 4.
There is a mark 2 on the outer surface 11' facing the lower swivel base 8.
2 and the same mark 2 as the visibility pole 20.
2, a mark for setting the rotation locus of a double-swivel type backhoe configured to set the relative position of the vertical swivel tables 8 and 4.