JPS6239152Y2 - - Google Patents

Description

[Detailed description of the invention] This invention prevents damage to the arm swing angle detection potentiometer provided at the pivot base on the arm mounting member side, loss of accuracy, and malfunction due to external force applied to the arm. In order to prevent this from happening,
A potentiometer is attached to a pivot base of one of a pair of arm constituent members that are pivotally supported so as to be able to swing relative to each other, and the rotary operation shaft of the potentiometer is rotated around a substantially coaxial center with the pivot axis of the arm constituent member. The potentiometer operating member attached to the other component is moved relative to the rotationally operated shaft through an elastic body that allows the potentiometer operating member to move relative to the axial direction and in a direction orthogonal thereto. The present invention relates to an improvement in a swing angle detection device for an earthwork arm which is connected so as to rotate the rotationally operated shaft.

To configure the above-mentioned swing angle detection device, as shown in FIG. The operating member 12 extending from the arm 5 and the free end of the rotating member 14 are connected by an elastically deformable spring pin 13A in a manner allowing relative movement between them. However, in general, the potentiometer 10 is more sensitive when an external force is applied in the axial direction than when an external force is applied in a direction perpendicular to the rotationally operated shaft 10a.
Bending stress acts on the sliding brush in the arm 5, which tends to cause a decrease in precision and malfunction due to poor contact between the brush and the coil. Most of the bending reaction force of the now spring pin 13A is applied to the rotated operation shaft 1.
Since it acts in the axial direction with respect to 0A, there is a drawback that it is not possible to sufficiently prevent a decrease in precision and malfunction of the potentiometer 10.

In view of the above-mentioned circumstances, the purpose of the present invention is to reduce the external force acting on the rotated operation shaft of the potentiometer in the direction of its axis in conjunction with the external force acting on the arm, through simple structural improvements. The purpose is to more reliably prevent a decrease in accuracy and malfunction of the yometer.

The characteristic configuration of the present invention is that in the above-mentioned rocking angle detection device for an arm for earthwork work, rubber as an elastic body is attached to the free end side of the rotating member attached to the rotationally operated shaft and to each of the operating member. The reason is that they are connected in pairs to seats facing each other.

The functions and effects of the characteristic configuration of the present invention are as follows. In other words, the relative movement between the rotating member and the operating member caused by an external force acting on the arm is allowed by compression or elongation deformation of the rubber provided on the free end side of the rotating member. The reaction force accompanying the extension is reduced by the action of the rotating member.
The actuating force acts primarily on the rotating operation shaft of the potentiometer as a bending moment in the direction perpendicular to the axis, reducing the force acting in the axial direction, and reducing the bending stress generated on the brush inside the potentiometer. By avoiding the poor contact caused by this, it has become possible to more reliably prevent a decrease in the accuracy of the potentiometer or malfunction. By simply improving the structure by adding rubber as an elastic body, it is possible to improve precision and smooth operation. It has now been possible to provide a working swing angle detection device.

Next, embodiments of the present invention will be described in detail with reference to illustrative figures.

As shown in FIG. 1, a swivel base 2 is attached to a traveling machine base equipped with a crawler traveling device 1 so as to be rotatable around a vertical axis, and a boom 3 is raised and lowered by a hydraulic cylinder 4 on the swivel base 2. an arm 5 is attached to the boom 3 so as to be swingable by a hydraulic cylinder 6; a bucket 7 is mounted to the arm 5 so as to be swingable by a hydraulic cylinder 8;
It also constitutes a backhoe for carrying out excavation work.

As shown in FIGS. 2 and 3, the boom 3
A first potentiometer 10 for detecting the swing angle of the arm 5 is attached to the bottom of a bottomed cylindrical member 9 bolted to a pivot base with the arm 5, and its rotated operation shaft 10a is connected to the arm 5 and the boom. 3 and the pivot axis X
A bolt is connected to the bottom of the member 9 with a vibration isolating rubber 11 interposed between the shaft and the bottom of the member 9, and a pair of shafts 10a to be rotated are attached to the end of the shaft 10a to be rotated. At the same time as attaching the rotating member 14, an L-shaped tongue piece 12 as a potentiometer operating member is attached to the pivot base of the arm 5, and its free end is aligned with the axis of the operating shaft 10a at the free end of the rotating member 14. A pin-shaped member 16 having a disk-shaped rubber seat 15 formed at the end is attached to each of the rotating member 14 and the lap portion of the L-shaped tongue piece 12 with bolts so as to wrap in the direction. The disc-shaped rubber seats 15 are pivotally connected so as to face each other, and a pair of cylindrical rubber 13 as an elastic body is connected between the pair of rubber seats 15. That is, as the arm 5 swings, the rotationally operated shaft 10a is rotated via the tongue piece 12, the rubber 13, and the rotating member 14, and the relative swing angle between the boom 3 and the arm 5 is determined from the potentiometer 10. It is configured so that it can be detected as a fluctuation in the electric signal, and due to the deformation of the rubber 13, the relative posture between the boom 3 and the arm 5 is caused to play due to use, elastic deformation due to excavation reaction force, and elastic deformation due to contact with other objects. In addition, the potentiometer 10 can be prevented from being damaged even if the potentiometer 10 changes due to the Rotary operation axis 1
0a, so as to act as a bending moment in a direction perpendicular to the axis thereof, thereby reducing the bending stress generated in the brush in the potentiometer 10,
It is configured to prevent a decrease in accuracy and malfunction due to poor contact of the brush.

As shown in FIG. 1, a first sensor is provided to detect the relative swing angle between the boom 3 and the swivel base 2, and the relative swing angle between the boom 3 and the arm 5.
It is configured to detect an electric signal from a second potentiometer 17 having the same structure as the potentiometer 10 as a fluctuation. Based on the information from the first and second potentiometers 10 and 17, the length of the boom 3, and the length of the arm 5, the distance from the ground where the traveling machine base of the bucket 7 touches the ground, that is, A device 18 for calculating and displaying the excavation depth is installed near a driver's seat 19 in a cabin attached to the swivel base 2, so that the operator can be informed of the excavation depth.

Next, another embodiment will be described.

To connect the rotating member 14 and the tongue piece 12, a fourth
As shown in the figure, both 14 and 12 are arranged with their free end surfaces facing each other, and rubber 13 is attached to both end surfaces.
A mounting seat 15 may be attached and the rubber 13 may be integrally connected, and the mounting structure of the rubber 13
The shape, material, and shape of each member can be changed in various configurations.

The swing angle detection device according to the present invention can be used to detect the swing angle of arms for various types of earthwork work, such as for detecting the relative swing angle between the arm and the traveling machine base in a shovel loader.

The detection results can be used, for example, to automatically operate the boom 3, arm 5, and bucket 7 according to a program in a bucket hoe to automatically perform excavation work, or to automatically perform excavation work in a bucket hoe.
It can be used for various purposes, such as for automatically operating the boom 3, arm 5, and bucket 7 to the same state as the model when a model placed near the model is manually operated.

[Brief explanation of the drawing]

The drawings illustrate an embodiment and a conventional example of the arm swing angle detection device for earthwork work according to the present invention, and FIG. 1 is a side view of a backhoe work vehicle, and FIG. 2 is a cross-sectional plane showing the mounting part of the potentiometer. 3 is a side view of FIG. 2, FIG. 4 is a side view of another embodiment, and FIG. 5 is a cross-sectional plan view showing a conventional example. 3, 5...Arm component, 10...Potentiometer, 10a...Rotated operation shaft, 12...Operation member, 13...Rubber, 14...Rotating member, 15
... Seat, X ... Swing axis center.

Claims (1)

[Scope of utility model registration request] A potentiometer 10 is attached to a pivot base of one of a pair of arm constituent members 3 and 5 which are pivotally supported so as to be able to swing relative to each other. The potentiometer operating member 12, which is attached so as to be rotated approximately coaxially with A rocking angle detecting device for an earthwork arm connected to rotate the rotationally operated shaft 10a through an elastic body 13 that allows relative movement to the , an arm for earthwork work, characterized in that a pair of seats 15 are connected to the free end side of a rotating member 14 attached to the rotationally operated shaft 10a and seats 15 provided oppositely to each of the operating members 12; swing angle detection device.