JPS60173224A - Excavator - Google Patents

Abstract

PURPOSE:To expand the rising, falling, and slewing ranges of a boom by a method in which a bracket is rotatably attached to the boom, a cylinder for operating the boom is provided between the bracket and the frame, and an oil-pressure cylinder is provided between the bracket and the boom. CONSTITUTION:Under the condition that the rod 40 of a cylinder 4 for operating a boom is maximumly extended, an oil-pressure cylinder 6 is extended in such a way as to enable a bracket 5 to counterclockwise slew around the support shaft (w). Since a connecting shaft (y) is supported by the cylinder 4 unmovably, the boom 3 is turned toward the direction of separating from the bracket 5 around the pivoting point (u) by as much a distance as the counterclockwise slewing of the bracket 5 around the shaft (w) in relation to the boom 3. The boom 3 becomes from a state of most risen to more greatly turned and risen state by the cylinder 4, and the boom 3 is then risen up to an angle beyond the limit of rising and turning range by the cylinder 4.

Description

[Detailed description of the invention]

The present invention is directed to the tip side I (equipped with an excavation body and mounted on the vehicle body).

[Regarding improvements to an excavator that is supported on a boom so that it can be rotated up and down, and that can be rotated up and down by the operation of a boom operating cylinder that is suspended between the boom and the frame. . As shown in Fig. 1, the excavator of the above-mentioned form has a frame (1) fixedly provided on a swivel platform that supports the vehicle body a so as to rotate with a vertical rotation shaft and a line. +11, excavation body such as excavation bucket on the tip side (2)
The boom (3) equipped with a A boom operating cylinder (4) consisting of a hydraulic cylinder that operates telescopically is installed between the frame; By controlling the control valve by operating an operating lever (not shown), the boom (3) can be moved forward and downward as shown by the chain line in Figure 1. The boom (3) is moved up and down between the vertical position and the upright position shown by the solid line to perform the excavation operation.
For the operation of the up-and-down rotation, the extrusion direction of the boom actuating cylinder (4) is set to the boom (3) at the end of the stroke of the up-and-down rotation.
There is a limit to the range of the luffing angle because it becomes parallel to the boom (3) and the force for the luffing rotation becomes insufficient, or it comes to interfere with the boom (3). limited to the moving angle range. Since the main activity is excavation, the lower limit position of the rotation angle range is set to allow sufficient downward rotation, so the attitude of the boom (3) in the raised state is normally As shown by the solid line in Figure 1, the vehicle is tilted slightly forward and the excavated body (2) scoops up enough earth and sand onto the vehicle a.
When the swivel platform is rotated to carry the vehicle to the rear of the vehicle body a, the rotation locus of the boom (3) including the excavator body (2) in plan view protrudes greatly to the outside of the swivel platform. A large amount of space is required on both the left and right sides of the excavator A, creating the problem that excavation work cannot be carried out in narrow places or on roads narrow enough for excavator A to fit. However, the problem is that the maximum rotation angle range of the boom (3) that is raised and rotated by the boom actuation cylinder (4) is
If possible, make the boom (30° to 30°) larger.
) by rotating it to a position tilting backwards,
This problem can be solved because the boom (3) including the excavation body (2) can be accommodated on the top surface of the swivel base when viewed from above, but this problem can be solved by the rotation of the boom actuating cylinder (4). A dynamic fulcrum V is provided at a fixed position on the frame (1), and a connecting shaft y of the boom operating cylinder (4) to the boom (3) is provided at a fixed position on the boom (3). Therefore, as can be seen from Figure 1 above, the rotation angle range of the boom (3) is theoretically within 180 degrees, but is actually mechanically limited to about 160 degrees. This problem cannot be resolved as long as this form is adopted. By the way, when the boom actuating cylinder (4) is extended to the maximum and the boom (3) is erected to its limit as shown by the solid line 7 in Fig. 1, in that state, the connecting shaft y is (3), the boom (3) will rotate further backwards (to the right in Figure 1) about the rotation fulcrum U due to the fluctuation. , the rotation angle range of the boom (3) can be expanded. Therefore, in the present invention, in the above-mentioned excavator, the rotation angle range of the boom (3) which is rotated up and down by the boom operation cylinder (4) described above is expanded. A boom is supported on a frame so as to be rotatable up and down around a fulcrum, and a bracket that rotates along the rotational direction of the boom is supported around a support shaft, and the boom is placed between the bracket and the frame. The present invention proposes a means for mounting an operating cylinder on a bridge, and also mounting a hydraulic cylinder for rotating the bracket about the support shaft between the bracket and the boom. Next, an example of implementation will be described in detail with reference to the drawings. Note that the same reference numerals as in the previous means will be used for the same constituent members. In FIG. 2, a is the excavation@A vehicle body, and crawler-type running wheels ff (It-σ0) are mounted on the left and right sides. (c) A swivel platform mounted on the top surface of the vehicle body a so as to be able to freely rotate around a vertical axis of rotation.Although not clearly shown in the drawings, on the top surface are the prime mover (engine), hydraulic system, oil tank, etc. A control valve device and the like are installed, and there is also a sunshade σj that covers the seat (7υ) above the driver seated between the seat where the driver sits, an operating lever that operates the control device, and the seat (7υ), and a hole drilled at the tip. The boom (3) on which the body (2) is mounted is installed.Next, in Fig. 3, (1) is attached to the above-mentioned swivel base to support the boom (3) so as to be able to raise and lower. The boom (3) is a frame installed on the top surface, and the base end of the boom (3) is supported by a mounting shaft that serves as a rotation fulcrum U so that it can freely rotate back and forth in FIG. 3. (4) A boom operating cylinder that rotates the boom (3) about the rotation fulcrum U to raise and lower it, and the tip of the rod (4) that operates to expand and contract is connected to the middle of the boom (3) in the longitudinal direction. By connecting via the axis y and supporting the base end of the cylinder (41) with respect to the frame il+ with the mounting shaft serving as the rotation fulcrum V,
Due to the telescopic operation of the rod (401), its cylinder (401
1) The boom (3) can be raised and rotated while rotating around the rotation fulcrum V that supports the base end of the boom (3).
It is the same as the previous means, but the boom actuation cylinder (4
) When connecting the tip of the rod (41) to the boom (3) via the connecting shaft y, do not connect it directly to the first boom (3); A bracket (5) is provided which freely rotates about the support shaft W along the direction of up-and-down rotation about the fulcrum U, and the rod (4) of the boom actuating cylinder (4) is attached to the bracket (5). By assembling and supporting the connecting shaft y that connects the tips of the boom actuating cylinder (4) is installed between the frame (1) and this bracket (5), and thereby,
As this bracket (5) rotates around the support shaft W, the connecting shaft y of the boom actuating cylinder (4) to the boom (3) rotates around the rotation fulcrum U of the boom (3). While doing so, it is displaced in the direction of advancing and retreating with respect to the boom (3). In the illustrated example, the support shaft W of the bracket (5) is separately provided above the pivot point U of the boom (3), but it may be provided coaxially with the mounting shaft that serves as the pivot point U. . (6) is a hydraulic cylinder for rotating the bracket (5) around the support shaft W and displacing the position of the connecting shaft y of the boom operating cylinder (4) with respect to the boom (3);
It consists of a cylinder (60) and a telescopic rod fitted into the cylinder (60), and is suspended between the bracket (5) and the boom (3). This hydraulic cylinder (6) only needs to be able to rotate the bracket (5) around the support shaft W, and may include an operating mechanism consisting of a screw rod and a female screw that is screwed into the rod and rotates by hydraulic pressure. It may be a hydraulically operated mechanism. In the illustrated example device, (80 is a boom (
03]1 is a hydraulic cylinder for bending and rotating the sub-boom (3a) which is connected and pivoted to the tip side of the sub-boom (3);
3a) is a hydraulic cylinder that bends and rotates the excavating body (2) which is connected and supported with a shaft at the tip, and t82 is a dozer that is removably mounted on the front end of the vehicle body a.Next, the function and effect will be explained. , the excavator A according to the present invention, which is a 11-f reed as described above, operates the boom actuating cylinder (4) until its rod (40) is extended to the maximum, and the boom ( 3) is rotated to its most upright position, the hydraulic cylinder (6) is operated to extend from that state, and the bracket (5) is rotated counterclockwise around the support shaft W in Fig. 3. By doing so, the connecting shaft y provided on the bracket (5) is supported by the boom actuating cylinder (4) and does not move, so the bracket (5) is aligned with the boom (3) around the support shaft W. As the boom (3) rotates counterclockwise in Figure 3, it rotates away from the bracket (5) around the rotation fulcrum U, as shown in Figure 4. as,
From the state shown in FIG. 3 in which the boom actuating cylinder (4) is raised to its maximum extent, the boom (3) is turned into a state where the boom (3) is raised and rotated to a greater extent, resulting in an enlarged angular range of the raising and lowering rotation of the boom (3). Therefore, the boom (3) is connected to the boom operating cylinder (4).
You will be able to stand up to angles that exceed the limits of the lifting and turning range.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the action of the conventional means, Fig. 2 is a side view of an excavator that can implement the present invention, Fig. 3 is a side view of the main parts of the same as above, and Fig. 4 is an explanatory diagram of the action of the same as above. 0 Explanation of drawing symbols A・Excavator a...Vehicle body b...Swivel base 1...Frame 2...Excavation body 3...Boom 3a...Subboom 4...Cylinder for boom operation 40...Rod 41...Cylinder y...Connection shaft 5...Bracket U-V...Rotation fulcrum w-0 support shaft 6...Hydraulic cylinder 60...Cylinder 61...Rod 70... Running wheel 7]...Seat 72...Operation lever 73...Sunshade 80...Hydraulic cylinder 81...Hydraulic cylinder 8:2...Dozer - Patent applicant Handozer Kogyo Co., Ltd. Figure 3 Building 4 Procedures Written amendment (method) June 1, 1980 Kazuo Wakasugi, Commissioner of the Patent Office 111, Indication of the case 1982 Patent Application No. 26829 2, Title of the invention Excavator 3, Person making the amendment Case and Relationship between Applicant 4 and Representative Masaru Hirokawa amended.

Claims (1)

[Claims] The boom (3) is supported on the frame il+ so as to be rotatable up and down around the rotation fulcrum V, and the boom (3) is supported around the support shaft W.
The bracket 5) which rotates along the rotational direction is pivotally supported,
A boom operating cylinder (4) is provided between the bracket (5) and the flume (1), and a boom operating cylinder (4) is provided between the bracket (5) and the boom (3). ) is rotated around the support shaft W by a hydraulic cylinder (6).
) An excavator characterized by the installation of a crossbody.