JPH01278625A - Swivel joint with turning angle detecting mechanism - Google Patents

Abstract

PURPOSE:To make an accurate and automatic stopping of slewing motion possible by detecting a relative turning angle between a rotor and a shaft by means of a potentiometer attached to the rotor, using a rotary roller fixed at the end of the shaft and circulating along the circumference of the shaft by friction force. CONSTITUTION:A potentiometer 3 is attached to the rotor 1 of a hydraulic circuit swivel joint through a bracket 2. A rotary roller 4 mounted to the end of the shaft of a meter 3 is adjusted so that the roller 4 can keep contact with the circumference of the flange 6 of a shaft 5, and rotate by friction force circulating the circumference of the flange 6 without slippage. Then, the turning angle of the rotor 1 in relation to the shaft 5 is converted to an electric signal by the meter 3 and inputted to a swing angle automatic control system.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a swivel joint used in a hydraulic circuit of a construction machine such as a hydraulic power shovel or a hydraulic crane.

(Prior Art) As shown in FIG. 7, the swivel joint 13 is attached to the center of rotation of the upper revolving body 14.

It is used as a joint for hydraulic piping from the hydraulic pressure a15 to the left and right travel motors 16, and its structure, as shown in Fig. 8, consists of a rotor 1 and a pair of legs fixed to the upper revolving body and connected to the piping from the hydraulic source. It consists of a shaft 5 that is fixed to a rotating device and connected to piping to a traveling motor, and is mutually rotatable around the central axis of the shaft 5. Conventional swivel joints are equipped with a rotation angle detection mechanism. It has not been done.

(Problem to be Solved by the Invention) Conventionally, the turning motion of a hydraulic power excavator, etc. is performed by the operator's operation of the turning lever, so the stopping position after turning varies depending on the slowness of the timing of lever operation, and the deviation by one position is large. In this case, there is a problem in that the turning lever must be operated again to correct the stopping position.

The present invention detects the turning angle when an automatic control system that detects and controls the turning angle is used as a means to automatically and accurately perform the turning stop operation of a hydraulic power excavator, etc.
This is performed using the rotation angle of the swivel joint, and the purpose of this invention is to provide a swivel joint with a side attachment for rotation angle detection a necessary for this purpose.

(Means for Solving the Problems) In order to achieve the above object, the swivel joint with a rotation angle detection mechanism of the present invention includes a rotation angle detection potentiometer or a proximity switch on the outer periphery of the rotor or shaft of the swivel joint. Or it has an optical sensor attached.

(Function) The swivel joint with a rotation angle detection mechanism configured as described above converts the rotation angle of the rotor relative to the shaft into an electrical signal using a potentiometer, a proximity switch, or an optical sensor.

Input to automatic turning angle control system.

(Example) Examples will be described below with reference to the drawings.

In FIG. 1, a potentiometer (rotary type) 3 is attached to a rotor 1 of a swivel joint for a hydraulic circuit via a bracket 2. At this time, the rotating roller 4 attached to the shaft end of the potentiometer 3 comes into contact with the outer periphery of the flange portion 6 of the shaft 5, and as the rotor 1 rotates, the rotating roller 4 rotates by friction without slipping on the outer periphery of the flange portion 6. Adjust accordingly. The wiring of the potentiometer 3 is connected to the automatic rotation angle control system.

Attach potentiometer 3 to shaft 5.

The rotating roller 4 may be brought into contact with the outer periphery of the rotor 1.

In the second embodiment shown in FIG. 2, a proximity switch 8 is attached to a rotor 1 of a swivel joint via a bracket 7, and an external tooth 9 fitted to the outer circumference of a flange portion 6 of a shaft 5.
The position of the proximity switch is adjusted so that the distance between the tip of the tooth and the tip of the proximity switch 8 becomes a predetermined distance. Melee sui again? The wiring of H8 is connected to the automatic rotation angle control system.

The proximity switch 8 may be attached to the shaft 5 and the external teeth 9 may be fitted to the outer periphery of the rotor 1.

In the third embodiment shown in FIG. 3, an optical sensor 11 is attached to a rotor 1 of a swivel joint via a bracket 10, and a barcode label 12 and an optical sensor 11 attached to the outer circumference of a flange portion 6 of a shaft 5 are attached. Adjust the position of the optical sensor so that the distance between it and the tip of the optical sensor becomes a predetermined distance. The barcode label 12 is, for example, a white background with black lines, and the black lines may be of equal width and at five equal intervals, and the wiring of the optical sensor 11 is connected to an automatic rotation angle control system.

The optical sensor 11 may be attached to the shaft 5 and the barcode label 12 may be attached to the outer periphery of the rotor 1.

(Effect of the invention) Since the present invention is configured as described above.

This produces the following effects.

The rotation angle of the rotor relative to the shaft of a swivel joint for hydraulic circuits can be detected accurately and quickly using a potentiometer, proximity switch, or optical sensor.
When adopting an automatic control system that detects and controls the rotation angle as a means to accurately and automatically perform the rotation stop operation of a hydraulic power excavator, etc. 1. When using the rotation angle detection mechanism 7-inch swivel joint of the present invention. Extremely convenient.

Also, the swivel joint of hydraulic power excavators etc. is installed in the center of the vehicle body.

There is no risk of damage to the rotation angle detection mechanism due to contact with earth and sand.

[Brief explanation of the drawing]

1, 3, and 5 are side views of a swivel joint with a rotation angle detection mechanism according to the present invention. FIG. 1 shows a potentiometer, FIG. 3 shows a proximity switch, and FIG. 5 shows an optical sensor. FIGS. 2, 4, and 6 are explanatory views of the detection mechanism in each of the above cases, and FIG. 7 is a schematic side view of the hydraulic power shovel. FIG. 8 is a schematic sectional view of the swivel joint. 1...Rotor 2.7.10...Bracket 3
...Potentiometer 4...Rotating roller 5...
・Shaft 8... Proximity switch 9... External teeth
11... Optical sensor 12... Barcode label 13... Swivel joint 14... Upper revolving body 15... Hydraulic source 16... Traveling motor patent applicant Komatsu Ltd. representative (patent attorney) 1) Kazuki Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] 1. A rotary roller 4 that frictionally rotates around the outer periphery of the shaft 5 or rotor 1 is fixed to the shaft end, and the rotor 1 or the shaft 5
A swivel joint with a rotation angle detection mechanism, characterized in that the relative rotation angle between the rotor 1 and the shaft 5 can be detected by a potentiometer 3 attached to either one of the rotor 1 and the shaft 5. 2. Instead of the potentiometer, a proximity switch 8 is attached to either the rotor 1 or the shaft 5 so as to maintain an appropriate distance from the tips of the external teeth 9 fitted on the outer periphery of the shaft 5 or the rotor 1. A swivel joint with a rotation angle detection mechanism according to claim 1. 3. Instead of the potentiometer, an optical sensor 11 is attached to either the rotor 1 or the shaft 5 so as to maintain an appropriate distance from the barcode label 12 attached to the outer periphery of the shaft 5 or the rotor 1. The swivel joint with a rotation angle detection mechanism according to item 1.