JPH0352281Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a swing drive mechanism for a double swing backhoe.

[Conventional technology]

Conventionally, there have been many machines in which the excavating part is rotatably or slidably mounted on a machine frame that is pivoted above the traveling part so as to be able to freely turn left and right, thereby enabling operations such as double turning. (Jikko No. 31096, 1982, Special Publication No. 1982)
No. 44777, Special Publication No. 26454 in 1982, Japanese Patent Publication No. 18823 in 1982
[Problems to be solved by the invention] However, in any of the conventional mechanisms, the double swing action or sliding action is driven by a single hydraulic pump, and the upper and lower swing actions are interlocked and connected by a gear mechanism. A configuration was adopted. For this reason, the structure is complicated, and in particular, it is not possible to independently rotate the upper or lower part, and the operating trajectory of the excavation work part is constant, so it cannot be used for a variety of field operations. It was hot.

[Means for solving problems]

In this invention, the fuselage frame is placed on a self-propelled traveling frame so that it can rotate in all directions, and the upper rotary table that supports the excavation work part is placed on this fuselage frame so that it can rotate in all directions. In a double-swing backhoe, the rotating axis of the frame and the rotating axis of the upper rotating table are arranged parallel to each other and deviated from each other, the fuselage frame is driven by a lower swinging hydraulic motor, and the upper rotating table is driven by an upper swinging hydraulic motor. Connect the lower swing hydraulic pump that supplies pressure oil to the lower swing hydraulic motor, connect the upper swing hydraulic pump that supplies pressure oil to the upper swing hydraulic motor, and discharge pressure oil from the lower swing hydraulic pump and the upper swing hydraulic pump. Set the amount to a ratio of 2:1, and set the ratio of rotation speed between the upper rotating table and the aircraft frame to 2:1.
The present invention provides a swing drive mechanism for a double swing backhoe, which is characterized by maintaining the following.

[Effect]

Therefore, it is possible to drive the upper and lower swings independently or simultaneously in two states, in the same direction or in opposite directions, and it is possible to make the excavation work section draw a variety of operating trajectories. especially,
When the directions of upper and lower rotation are opposite to each other,
The operating locus of the excavating work section is approximately elliptical, and the major axis direction of the elliptical locus can be arbitrarily set by independent operation of the upper and lower swings.

〔Example〕

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

First, FIG. 1 shows a panoramic view of a hydraulically driven double-swinging excavator A. A lower swivel base 3 is erected approximately in the center of the running frame 2, which is equipped with crawlers 1 on both sides as a running part, and on this lower swivel base 3, a fuselage frame 4 is mounted horizontally around the entire circumference. It is mounted so that it can be rotated. On the upper surface of this fuselage frame 4, a driving unit 5 is mounted at the rear and an upper rotating base 6 is mounted at the front. A table 7 is placed there.

Approximately in the center of the upper surface of the upper rotary table 7 is a driving section 8.
is placed thereon, and at the front end of the upper rotary table 7, a support body 9 for supporting the excavation work part B is provided facing forward. At the top of this support 9 is an excavation working section B consisting of a boom 10, an arm 11 and a bucket 12.
are connected to each other so that they can move up and down.

Further, on the front side surface of the lower swing base 3 of the traveling frame 2, an earth removal plate 13 which can be raised and lowered up and down is arranged.

The center of rotation of the fuselage frame 4 and the upper rotating table 7
A predetermined offset d is set between the shaft centers and the turning center. Because this offset d is provided, the upper rotating table 7 is positioned closer to the fuselage frame 4.
While rotating on its own axis, it can perform a double turning action in which it revolves around the traveling frame 2 with the offset d as a radius. This double rotation operation is performed by an upper rotation hydraulic motor 14 and a lower rotation hydraulic motor 15, which are respectively interposed between the upper rotation table 7 and the upper rotation base 6 and between the fuselage frame 4 and the lower rotation base 3. It is driven by In addition, in FIG. 1, the reference numeral 16 indicates an upper swivel joint;
Reference numeral 17 indicates a lower swivel joint.

The operating section 8 is provided with various operating levers for operating the bucket hoe A. Approaching the seat 18, an operating lever 19 for controlling the turning operation of the upper rotating table 7 and the fuselage frame 4 is provided upright on the left front side thereof. By operating this operating lever 19 in the left-right direction, the upper rotary table 7 and the body frame 4 are turned leftward or rightward. The control of this operating lever 19 is as follows:
It is transmitted to the upper swirl valve 22 in the main control valve 20 and the lower swirl valve 23 in the sub-control valve 21, and the upper swirl valve 22 and the lower swirl valve 23 can be interlocked by a link mechanism (not shown). It is connected.

Further, on the right side of the seat 18, there is a selector lever 24 that allows the fuselage frame 4 to select whether to rotate only one of the upper rotary tables 7 or to rotate in the opposite direction. The operation of the lever 24 is coupled to the upper selector valve 26 and the lower selector valve 27 through a link mechanism so that they can be operated in conjunction with each other.

Next, the upper swing hydraulic pump 28 and the lower swing hydraulic pump 29 driven by the prime mover E have independent structures, and each has a separate suction side and discharge side port. The driven oils of the upper swing hydraulic pump 28 and the lower swing hydraulic pump 29 are coaxially connected to the prime mover E.
The upper swing hydraulic pump 28 and the lower swing hydraulic pump 29 are driven by the prime mover E at the same rotational speed. Further, the discharge amounts of the upper swing hydraulic pump 28 and the lower swing hydraulic pump 29 are set at a ratio such that if the upper swing hydraulic pump 28 is "2", the lower swing hydraulic pump 29 is "1". There is.
Therefore, the ratio of the discharge amounts of the upper swing hydraulic pump 28 and the lower swing hydraulic pump 29 is 2:1. Therefore, the prime mover E simultaneously operates the upper swing hydraulic pump 28 and the lower swing hydraulic pump 29.
When the two are driven, the amount of pressure oil discharged from both is in a ratio of 2:1.

Pressure oil supplied from the upper swing hydraulic pump 28 is supplied to the main control valve 20.
The pressure oil supplied from the lower swing hydraulic pump 29 is connected to the sub-control valve 21. In addition, 30 is a hydraulic pump for driving other equipment, the driven shaft of the hydraulic pump 30 for driving other equipment is directly connected to the prime mover E, and the hydraulic pump 28 for upper swing and the hydraulic pump 2 for lower swing
9. The hydraulic pump 30 for driving other equipment is coaxially driven.

FIG. 2 is a block diagram schematically showing hydraulic power and operation control.

Upper swing hydraulic pump 2 driven by prime mover E
8. Pressure oil discharged from the lower swing hydraulic pump 29 and the other equipment hydraulic pump 30 is controlled by the main control valve 20 and sub-control valve 21 and is supplied to each hydraulically operated device. It is what activates it. An upper selector valve 26 is interposed between the upper swing hydraulic motor 14 and the main control valve 20, and a lower selector valve 27 is interposed between the lower swing hydraulic motor 15 and the sub-control valve 21. There is. These upper selector valve 26 and lower selector valve 27
can be controlled by switching the selector lever 24, and the main control valve 20
And the flow of pressure oil from the sub-control valve 21 can be switched between forward and reverse directions or closed.
For this reason, by combining the upper selector valve 26 and the lower selector valve 27 with the forward and reverse neutral positions,
Pressure oil can be supplied to either the upper swing hydraulic motor 14 or the lower swing hydraulic motor 15 independently, pressure oil can be supplied to both in the forward direction, or pressure oil can be supplied to both in the opposite direction. can.

FIG. 3 shows the hydraulic circuit H. In this figure, safety, cushion, drain, and servo-related circuits are omitted to avoid complication of drawing.

The upper swing valve 22 is a spring center type hydraulic directional control valve, and is disposed within the main control valve 20 at a position that first receives pressure oil from the upper swing hydraulic pump 28. The upper swing valve 22 is controlled so that the pressure oil from the upper swing hydraulic pump 28 flows only in the direction of the upper swing hydraulic motor 14 and is stopped from flowing to other equipment.

The lower swing valve 23 is also of the spring center type, and is disposed within the sub-control valve 21 at a position that first receives pressure oil from the lower swing hydraulic pump 29.

Both the upper selector valve 26 and the lower selector valve 27 have three detent positions: forward rotation, neutral rotation, and reverse rotation. When these upper selector valve valve 26 and lower selector valve 27 are in the neutral position, the pressure oil from the upper swing valve 22 and the lower swing valve 23 is closed, and the upper swing hydraulic motor 14 and the lower swing hydraulic motor 15 are operated. is being stopped. Furthermore, when the upper selector valve 26 and the lower selector valve 27 are in the reverse position, the pressure oil can be switched in the opposite direction to the direction in which the pressure oil flows in the normal rotation position.

Therefore, an extremely large number of operating devices can be installed in the excavation work section B. By selecting one of the actuating devices according to the situation at the site, the driver can perform the subsequent work only by operating the operating lever 19. In particular, when the rotating directions of the upper rotary table 7 and the machine frame 4 are reversed, the operating trajectory of the excavating work part B becomes elliptical, such as work in which earth and sand excavated in the front is loaded onto a truck in the rear in a narrow space. In this case, the amount of lateral protrusion of the excavating work section B can be reduced, and work efficiency is improved. Note that in this case, the operating direction of the excavating work unit B is the same as the rotating direction of the upper rotary table 7.

Moreover, the major axis direction of the elliptical trajectory is the upper swing hydraulic motor 14 and the lower swing hydraulic motor 15.
It can be set arbitrarily by operating independently.

In addition, in FIGS. 2 and 3, symbols 31,
32 and 33 indicate hydraulic cylinders for the boom, arm, and bucket of excavation work section B;
5 and 36 indicate hydraulic valves for controlling the cylinders 31, 32, and 33. Code 37, 38
indicates a hydraulic motor for left and right travel, and code 3
Reference numerals 9 and 40 indicate hydraulic valves for controlling the hydraulic motors 37 and 38, and reference numerals 41 and 42 indicate the earth removal plate 13, the lifting hydraulic cylinder, and the hydraulic valves for controlling the cylinder 41.

[Effects of the Invention] According to this invention, by configuring the swing drive mechanism of the double swing backhoe as described above,
It has a simple structure and allows the excavating work section to draw a variety of operating trajectories, which is particularly effective in improving workability in confined spaces.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the entire embodiment of a double swinging vacuum hoe having a swing drive mechanism according to the present invention, Fig. 2 is a block diagram showing the hydraulic power and control mechanism of the same as above, and Fig. 3 is a hydraulic diagram of the same as above. It is a circuit diagram. A... Batsukuho, B... Excavation work department, 2...
Traveling frame, 4... Airframe frame, 7... Upper rotating table, 14... Upper swing hydraulic motor, 15...
...Lower swing hydraulic motor, 28...Upper swing hydraulic pump, 29...Lower swing hydraulic pump.

Claims (1)

[Scope of Claim for Utility Model Registration] A machine frame is placed on a self-propelled traveling frame so as to be able to rotate in all directions, and an upper rotary table that supports an excavation work part is placed on this body frame so that it can be freely rotated in all directions. A double swing system in which the rotating axis of the fuselage frame and the rotating axis of the upper rotary table are arranged in parallel and deviated from each other, the fuselage frame is driven by the lower swing hydraulic motor, and the upper rotating table is driven by the upper swing hydraulic motor. In the backhoe, the lower swing hydraulic pump that supplies pressure oil to the lower swing hydraulic motor is connected, the upper swing hydraulic pump that supplies pressure oil to the upper swing hydraulic motor is connected, and the lower swing hydraulic pump and upper swing hydraulic pump are connected. Set the discharge amount of pressure oil to a ratio of 2:1, and set the ratio of rotation speed between the upper rotating table and the aircraft frame to 2:1.
A swing drive mechanism for a double swing backhoe, which is characterized by maintaining the swing drive mechanism as follows.