JPH10338945A - Swivel joint device with angle-of-rotation automatic sensing mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stop a revolving superstructure repeatedly at a fixed place without requiring the skilled driving ability of a working machine by installing a mechanism in which the angle of rotation of the revolving superstructure is detected automatically and the slewing of the revolving superstructure can be stopped automatically, in a swivel joint device for the working machine with the revolving superstructure such as a hydraulic backhoe. SOLUTION: In the swivel joint device 5 with a shaft section 3 fixed onto the travelling body 2 of a working machine with a revolving superstructure and a body 4 retained to the revolving superstructure and rotatably fitted to the shaft section 3, the swivel joint device 5 is constituted so that a shaft 6, in which an axial center is clamped similarly into the head-section tapped hole of the shaft section 3, is connected to the shaft section 10 of a rotary encoder 9 disposed while being penetrated to a cover 7 for the body 4 and fixed onto the cover 7 through a coupling 11, the place of the slewing of the revolving superstructure can be detected automatically and the supply of high-pressure oil to a turning motor can be controlled by the groove shape of the outer circumference of the shaft section 3 and the positional relationship of the oil paths 17a, 17b... of the body 4 for automatically stopping the slewing of the revolving superstructure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swivel joint device provided at the center of rotation of a swing body of a working machine such as a hydraulic shovel having a swing body and a traveling body.

[0002]

2. Description of the Related Art A conventional swivel joint device of a working machine such as a hydraulic shovel, which is disposed at the center of rotation of a revolving body, is characterized in that the revolving body can freely rotate with respect to a traveling body. In order to stop at a fixed position, it was necessary to perform a turning stop operation at a fixed turning angle.

[0003]

However, the conventional swivel joint device requires a skilled driving skill to repeatedly stop the revolving superstructure at a fixed position. As a result, a high cost is required to secure a skilled driver, and there is a problem to be solved by the present invention.

[0004]

In order to achieve the above object, a swivel joint device for a working machine having a revolving body such as a hydraulic shovel according to the present invention comprises: a shaft fixed to a traveling body of the working machine; It consists of a body that is locked to the revolving body of the machine and rotatably fits on the shaft, but a small-diameter shaft with the same axis is fastened to the head of the shaft to rotate with the body. By providing a device for automatically detecting the angle and providing a mechanism for automatically stopping the turning of the revolving structure, it is easy to repeatedly stop the revolving structure at a fixed position, and is skilled in stopping the revolving structure at a fixed position. No longer needed.

[0005]

Next, an embodiment of the present invention will be described with reference to the drawings. A swivel joint device 5 of a working machine having a revolving unit 1 such as a hydraulic shovel of FIG. 1 is engaged with a shaft unit 3 fixed to a traveling unit 2 and the revolving unit, and rotatably fits on the shaft unit. A shaft 6 composed of a body 4 and having a male screw with the same axis as a male screw is fastened to a screw hole in the head of the shaft portion. The shaft 6 penetrates through the cover 7 of the body 4 and is connected via a coupling 11 to a shaft portion 10 of a rotary encoder 9 which is fastened by bolts 8 to a bracket 35 fixed to the cover. In the state where the coupling 11 is connected, the rotation angle of the revolving body is automatically detected by the rotary encoder 9 as the rotation angle of the shaft portion 3 and the body 4, and the automatically detected rotation angle is within the cab 14. Controller 36
Can be displayed on the current value display device 39 via the driver, so that the driver can know the current value while performing the operation, and the driving operation is facilitated. Furthermore, the swivel joint device 5 of the present invention
Is a mechanism for automatically stopping the supply of high-pressure oil to the hydraulically driven swing motor 12 and automatically stopping the swing of the swing body according to the positional relationship between the groove shape of the oil passage of the shaft portion 3 and the oil passage of the body 4. The mechanism is shown in FIGS. 1, 2, 3,
This will be described with reference to FIG. FIG. 2 is a longitudinal sectional view of one embodiment of a swivel joint device 15 such as a hydraulic shovel having a soil removal plate, and FIGS. 1, 3, and 4 show a swivel joint device 5 of the present invention. The swivel joint device 5 will be described with reference to FIGS. 1 and 2. The oil passages 17a, 17b and 1 for supplying hydraulic oil to the right traveling motor 50a
8a, 18b and oil passages 19a, 19b and 20a, 20b for supplying hydraulic oil to the left running motor 50b, and oil passages 21a, 21b and 22a for supplying hydraulic oil to the hydraulic cylinder 16 for the earth discharging plate 13. The provision of 22b is the same as that of the conventional swivel joint device 15 such as a hydraulic shovel having an earth discharging plate.

However, the swivel joint device 5 according to the present invention is characterized in that oil passages 23a, 23b and 24a, 24b for limiting the revolving range of the revolving unit 1 are provided above the oil passage.

Next, as an embodiment for limiting the turning range of the revolving unit 1, the turning range of the revolving unit 1 is changed from 2 degrees to 358 degrees.
The mechanism for restricting the rotation speed will be described with reference to FIGS. 5 and 6 showing the hydraulic circuits around the swivel joint devices 5 and 15, and FIGS. 3 and 4. As shown in FIGS. 5 and 6, the swivel joint device 5 of the present invention includes the oil passages 23 a and 23 b and the oil passages 24 a and 24 b, and the hydraulic oil to the hydraulically-driven swing motor 22 that swings the swing body 1. Are oil passages 23a and 23b and oil passages 24a and 24b
Is supplied via

First, the object to be excavated is excavated in the direction opposite to the earth discharging plate 13 in FIG.
, The high-pressure hydraulic oil rotates the revolving motor 22 in the direction of turning the revolving unit 1 rightward via 23a and 23b, and then the low-pressure hydraulic oil passes through the oil passages 24b and 24a. Then, the operation returns to the hydraulic power source 34. At that time, when the revolving superstructure 1 comes in a range of 2 degrees to 0 degrees with respect to the traveling superstructure 2,
The body 4 rotates with respect to the shaft 3 fixed to the traveling body 2, and as shown in FIG. 3, the oil passage 23a of the body 4 comes to the position where the groove of the shaft 3 is interrupted. Is oilway 23
b, the high-pressure oil is not supplied to the swing motor 12, and the swing of the swing body 1 ends and stops. (Ejector 1
The direction of 3 is 0 degree. )

[0009] Next, after the excavated objects are stacked in front of the earth discharging plate 13 and then turned to the right in the state of the boom 31 and the arm 32 as shown in FIG. The high-pressure oil is not supplied to the turning motor 12 because it is blocked, and the high-pressure oil is supplied to the 24a, 2a only when the left turning operation is performed.
4b, the rotation motor 12 is supplied to the rotation motor 12, and rotates the rotation motor 12 in a direction for rotating the revolving unit 1 to the left.

Conversely, when the object to be excavated is excavated in the opposite direction to the earth discharging plate 13 and then turned to the left, and the object to be excavated is loaded in front of the earth discharging plate 13, the high-pressure hydraulic oil is 24a. After rotating the turning motor 12 in the direction of turning the revolving unit 1 to the left via 24b, the low-pressure hydraulic oil returns to the hydraulic source 34 via the oil passages 23b and 23a. At that time, revolving superstructure 1
Comes in the range of 358 degrees to 360 degrees with respect to the traveling body 2, the shaft 4 fixed to the traveling body 2 moves toward the body 4.
Rotates, and as shown in FIG. 4, the oil passage 24a of the body 4 comes to the position where the groove of the shaft portion 3 is interrupted, so that the high-pressure oil is no longer supplied to the oil passage 24b. The revolving structure 1 is not supplied and the revolving structure 1 ends and stops. next,
When the operation to turn left is performed in the state of the boom 31 and the arm 32 as shown in FIG. 7 after the excavated objects are stacked in front of the earth removal plate 13, the oil passage 24a is closed. The high-pressure oil is not supplied to the turning motor 12, but is supplied to the turning motor 12 after passing through 23 a and 23 b only when the right-turning operation is performed, and the turning motor 12 is turned in the right-turning direction of the revolving body 1. To rotate.

As described above in the embodiment, the groove shape and the body 4 of the shaft 3 of the swivel joint device 5 of the present invention are described.
The supply of high-pressure oil to the turning motor 12 that turns the revolving unit 1 can be automatically stopped by the positional relationship of the oil path described above, and the turning of the revolving unit 1 can be automatically stopped. is there. Further, as shown in the block diagram of FIG.
6, when the current angle is reached in the set angle, the relay 37
By operating the electromagnetic switching valve 38 of a control valve (not shown) for controlling the hydraulic circuit, the revolving structure 1 can be automatically stopped repeatedly at an arbitrary set angle.

[0012]

Therefore, the swivel joint device of the present invention can automatically detect the turning angle of the revolving unit and has an automatic stop mechanism for the revolving unit as shown in the block diagram of FIG. In a working machine such as a hydraulic shovel having a revolving superstructure and a traveling superstructure, it is easy to stop the revolving superstructure at a fixed position, and the skill required for stopping the revolving superstructure at a fixed rotation position is not required. As a result, the need for skilled drivers is reduced and costs can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a swivel joint device of the present invention.

FIG. 2 is a longitudinal sectional view of a swivel joint device related to the present invention.

FIG. 3 is a sectional view of an upper oil passage of the swivel joint device of the present invention.

FIG. 4 is a sectional view of the upper oil passage of the swivel joint device of the present invention.

FIG. 5 is a hydraulic circuit diagram relating to the swivel joint device and the swing motor of the present invention.

FIG. 6 is a hydraulic circuit diagram related to the present invention.

FIG. 7 is a side view of the hydraulic excavator according to the embodiment of the present invention.

FIG. 8 is a block diagram related to the rotary encoder of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Revolving body 2 Traveling body 3 Shaft 4 Body 5 Swivel joint device 6 Shaft 7 Cover 8 Bolt 9 Rotary encoder 10 Shaft portion 11 Coupling 12 Swing motor 13 Drain plate 14 Operating room 15 Swivel joint device 16 Hydraulic cylinder 17a Oil passage 17b oil line 18a oil line 18b oil line 19a oil line 19b oil line 20a oil line 20b oil line 21a oil line 21b oil line 22a oil line 22b oil line 23a oil line 23b oil line 24a oil line 24b oil line 25 safety valve 26 crossover Safety valve 27 Seal 28 Seal 29 Seal 30 Seal 31 Boom 32 Arm 33 Bucket 34 Hydraulic power source 35 Bracket 36 Controller 37 Relay 38 Electromagnetic switching valve 39 Current value display device 40 Cable 41 Cable 50 Traveling motor 50a Right running motor 50b Left running Row motor

Claims (2)

[Claims] 1. A swivel joint device having a shaft fixed to a traveling body of a work machine having a revolving body and a body locked to the revolving body and rotatably fitted to the shaft. A small-diameter shaft having the same axis as that of the head of the part is fastened by penetrating the cover of the body, and is connected to the shaft part of the rotary encoder fixed to the cover. Swivel joint device capable of automatically detecting the 2. The supply of high-pressure oil to a hydraulically driven swing motor according to claim 1, in which the swing of the swing body is automatically stopped, based on a positional relationship between a groove shape of the outer periphery of the shaft and an oil passage of the body. Swivel joint device with a mechanism to automatically stop