JPH0355647Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a sensor mounting device for detecting the bucket tilt angle of a hydraulic excavator.

Prior Art When operating a hydraulic excavator, the boom and arm are rotated as appropriate to set or move the bucket tote, which is pivotally supported at the end of the arm, to a desired position. The bucket is rotated to set the required inclination angle to perform accurate work.A tilt angle sensor is attached to the bucket, and the signal from this sensor is used to determine the tilt angle of the bucket and the rotation angle of the boom and arm. If the control is controlled accordingly, conventional work of this type that requires three operations of the boom, arm, and bucket can be reliably done with only two operations of the boom and arm.

For example, using a hydraulic excavator body 1 shown in FIG. 3, a boom 2 pivoted to the hydraulic excavator body 1, and an arm 3 pivoted to the tip of the boom 2,
A method in which the boom cylinder 5 and the arm cylinder 6 are expanded and contracted to rotate, and at the same time, the wash bucket 4 pivotally supported at the tip of the arm 3 is expanded and contracted, and the bottom plate 10 of the wash bucket 4 is made to be θ. Rolling or forming is performed by setting the slope parallel to the slope 8 having a surface angle and pressing the slope 8 or cutting down along the slope 8. , slope b
must be set at different angles with respect to the arm 3. Therefore, in such work, the boom cylinder 5, arm cylinder 6, and bucket cylinder 7 must be operated at the same time, as described above, and the operation is difficult. It is complex and requires considerable skill.

Recently, an automatic bucket tilt angle control system has been adopted in order to avoid this complicated driving operation, making slope work like the one described above easier by simply rotating the boom 2 and arm 3. In order to adopt the control method, it is necessary to provide a bucket tilt angle sensor that detects the tilt angle of the bucket.

Conventionally, the method for installing a bucket tilt angle sensor is to press the rotary shaft of a potentiometer onto the rod of a bucket cylinder via a rubber roller.
There is a structure that indirectly detects the bucket rotation angle from the reciprocating distance of the rod of the bucket cylinder. However, with this structure, slipping occurs between the rubber roller and the rod, making it impossible to accurately detect the rotation angle. Furthermore, since the rod is connected to the bucket belt via a link mechanism, it is difficult to determine the reciprocating distance of the rod and the bucket belt. The relationship with the rotation angle of the bucket is complicated, and even if the reciprocating distance of the rod is measured, the rotation angle of the bucket cannot be accurately detected.The structure is also complicated.

In addition, as another example, as shown in FIG. 4 and FIG. 5, which is a view of the main part shown in the direction of arrow B in FIG. There is a method of attaching the inclination sensor 9 that detects the ground angle and providing the cover 26; however, in this method, the inclination sensor 9
Since it is located in the immediate vicinity of the slope bucket 23 and protrudes, it is easily damaged by earth and sand.

Problems that the invention attempts to solve This invention solves the above problems, has a simple structure,
Moreover, earth and sand may enter the inclination sensor mounting part,
Without being damaged by contact with rocks, etc.
It is an object of the present invention to provide a mounting device for a bucket tilt angle sensor that can always accurately detect a bucket tilt angle.

Measures to solve the problem: The left and right side plates that form the bucket are firmly held, and a tilt angle sensor is installed in the middle of the space formed by the left and right side plates and the plurality of connecting members that are the main attachment members of the bucket holder. An open box made of steel plate with a size that can accommodate the space is welded together so that its open side faces outward from the space, and a tilt angle sensor is installed inside the open box via a bracket. At the same time, a cover having a hole through which the lead wire of the tilt angle sensor can be taken out to the outside via a grommet is attached to the open surface in a watertight manner.

Function: The open type box is installed in the internal space of the strong connecting member, and the tilt angle sensor is housed inside the open type box, and a cover with a grommet for taking out the lead wire is attached in a watertight manner. So,
The tilt angle sensor is protected from external dirt, water, and obstacles, and rotates in unison with the rotation of the bucket, so it can directly detect the tilt angle.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. Fig. 1 is a side view of a slope bucket bag 4, which is a typical example to which the present invention is applied, with a part cut away to clearly show the internal structure, and Fig. 2 is a view taken along arrows AA in Fig. FIG.

In the figure, numeral 9 is an inclination sensor fixedly installed by bolts and nuts 20 through a bracket 22 installed inside the open box 15, and numeral 10 is a bottom plate for slope forming of the slope bucket cart 4. The bottom plate 10 is welded to left and right side plates 11, 11 to form a bucket main body, and the left and right side plates 11, 11 are formed into a sturdy box shape by connecting members 12, 12, 13. The above connecting member 1
2, 12, 13 and the side plates 11, 11 to form a space 14. As shown in FIG. protrudes into the space 14, and the open surfaces are welded to the connecting members 12 and 13, respectively.

Moreover, on the open surface of this open box 15,
A cover 17 is attached in a watertight manner by means such as bolts and nuts 19, and the lead wire 21 of the tilt angle sensor 9 is passed through a grommet 18 made of an elastic material such as rubber and inserted into a through hole of the cover 17.
is drawn outside.

In addition, 16 is a bucket holder for pivotally supporting the slope bucket 4 at the tip of the arm 3 and rotating the slope bucket 4 via a link device by the expansion and contraction action of the bucket cylinder 7. , are firmly welded to the connecting members 12, 12, 13.

Since the present invention has the structure as described above,
As the slope bucket cart 4 rotates, the inclination sensor fixed in the open box 15 integrated with the slope bucket cart 4 simultaneously rotates and directly
Since the inclination of the slope bucket 4 to the ground is detected and a signal is sent through the lead wire, not only can the inclination angle be detected accurately, but the inclination sensor 9 does not protrude from the strength member of the slope bucket 4, and the installation location is watertight. is maintained.

The above embodiment has been explained based on an example in which this invention is applied to a slope bucket cart for a hydraulic excavator, but the invention is not only applicable to this slope bucket cart, but also to bucket carts of various shapes. Available. For example, the structure of bucket carts, ritzpa bucket carts, crushed stone bucket carts, etc. is composed of left and right side plates and a plurality of connecting members that connect them, as described above. Therefore, the shape of the connecting member, side plate, or member corresponding to the side plate may be different. However, in order to increase the rigidity of the entire bucket and to reduce the weight as much as possible, the connecting members are arranged in a cross-sectional shape such as a figure-eight shape or a hollow square shape as shown in the example. Since a space is formed surrounded by the member and the side plate or side plate equivalent, the above-mentioned open box may be installed in this space.

In addition, in this invention, a part of the connecting member is cut out and an open box is inserted and welded, so
In order not to reduce the strength of the connecting member, it is natural that the thickness of the plate constituting the open box is required to have a strength greater than the thickness of the connecting member.

Effects of the invention Since the tilt angle sensor is mounted directly on the member that rotates together with the bucket belt, the accuracy of tilt angle detection is improved, and the main body of the tilt angle sensor can be installed in a space surrounded by strong connecting members, side plates, etc. It is installed inside an open box, and has a cover to keep the open box watertight and a grommet for taking out the lead wires, so it is protected from damage caused by collisions with external obstacles, dirt, and water. The tilt angle sensor works well because it is not affected by the effects of water, and has a simple structure that allows it to be applied at low cost to various types of buckets attached to hydraulic excavators, and can be easily installed by modifying existing buckets.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view of the present invention applied to a slope bucket, Fig. 2 is a view showing the main parts of Fig. 1 as viewed from the A-A arrow, and Fig. 3 is FIG. 4 is a side view of the hydraulic excavator showing the state of work on a slope; FIG. 4 is a side view of a slope bucket with an inclination sensor attached in a conventional manner; and FIG. 5 is a rear view as viewed from arrow B in FIG. 4... Slope bucket, 12, 13... Connection member, 9... Inclination sensor, 15... Open type box, 10... Bottom plate, 17... Cover, 11... Side plate, 18... Grommet.

Claims (1)

[Scope of utility model registration request] A boom is rotatably supported on the main body, an arm at the tip of the boom, and a bucket at the tip of the arm, and the boom, arm, and bucket are operated by a hydraulic cylinder directly or via a link mechanism. A steel plate open type box for storing a tilt angle sensor is installed in the middle of the space formed by the left and right side plates or equivalent members of the bucket of the hydraulic excavator and a plurality of connecting members that connect the left and right side plates or equivalent members. The bottom part protrudes into the space, and the open surface faces outward from the space and is welded into one piece,
A tilt angle sensor is fixed inside the open box via a bracket, and a cover is provided on the open surface with a hole for taking out the lead wire of the tilt angle sensor to the outside via a grommet that penetrates the box in a watertight manner. A mounting device for a bucket tilt angle sensor that is characterized by being mounted in a straight line.