JP3719573B2 - Excavator offset angle detector layout structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an arrangement structure of an offset angle detector of a power shovel.
[0002]
[Prior art]
For example, if the example of FIG. 1 is borrowed, the offset type power shovel is connected to the vehicle body 1 by a first horizontal pin (not shown), and the base end is pinned by the operation of the first boom hydraulic cylinder C1. The first boom B1, the second boom B2 whose rear end is pin-connected to the front end of the first boom B1 by the first vertical pin P1, and the rear end of the second boom B2 by the second vertical pin P2. A third boom B3 that is pin-coupled to each other, an arm B4 whose base end is pin-coupled to the distal end of the third boom B3 by a second lateral pin Pa, and can be raised and lowered by the operation of the arm hydraulic cylinder C2, and the arm B4 A bucket B5 is connected to the tip by a third horizontal pin Pb and a bottom back portion is connected to the bucket B5 by a hydraulic cylinder for bucket C3. Between the same side surfaces of the first and third booms B1 and B3, the length is approximately equal to the distance between the offset hydraulic cylinder C4 and the first and second vertical pins P1 and P2, and A rod R arranged substantially in parallel with the second boom B2 is pin-connected at both ends by four vertical pins, and is parallel to the four nodes by the first, second, third booms B1, B2, B3 and the rod R. A link is configured. Even if the second boom B2 turns around the first vertical pin P1 by expansion and contraction of the offset hydraulic cylinder C4, the third boom B3 has an offset structure that maintains its posture. Here, the turning angle of the second boom B2 around the first vertical pin P1 is referred to as an offset angle θ. The offset excavator has various configurations, and the bucket B5 can be replaced with an attachment such as a breaker.
[0003]
The offset angle θ is normally input to a vehicle-mounted controller (not shown) such as a microcomputer and used for automatic excavation control or the like, and can be detected by an offset angle detector such as an absolute encoder or a resistance potentiometer. Has been.
[0004]
As an arrangement structure of such an offset angle detector, conventionally, as shown in FIG. 4, its main body 2a (hereinafter referred to as "offset angle detector main body 2a") is fixed on the first vertical pin P1, In general, the detection link 2b (hereinafter referred to as "offset angle detection link 2b") is pin-connected to the upper surface of the second boom B2 (hereinafter, the main body 2a and the detection link 2b of the offset angle detector are connected to each other). When collectively referred to, it is simply referred to as “offset angle detector 2”). In rare cases, as disclosed in Japanese Utility Model Publication No. 6-63666, an offset angle detector main body 2a is fixed to the side surface of the first boom B1.
[0005]
[Problems to be solved by the invention]
However, the arrangement structure of the offset angle detector 2 of the conventional offset type excavator has the following problems.
[0006]
When the offset angle detector body 2a is fixed on the first vertical pin P1, the offset angle detector 2 protrudes greatly upwards, so that, for example, when excavating with a power shovel, it is opposed by a protrusion h. There are complaints that the offset angle detector 2 is likely to interfere with a wall or the like and is damaged.
[0007]
The one disclosed in Japanese Utility Model Publication No. 6-63666 in which the offset angle detector main body 2a is fixed to the side surface of the first boom B1 solves the above-mentioned complaint, but has the following new problems. Arise. The offset excavator was originally designed to achieve highly efficient operation in a city where the operable space is limited. Therefore, it is used for small power shovels. However, regardless of the size of the power shovel, the size of the operator cabin can be increased, but it cannot be decreased. In addition, it is economically preferable to use a standard product for the offset angle detector 2, and therefore there is almost no degree of freedom in selecting the size. For this reason, the offset-type excavator capable of mounting the offset angle detector 2 on the side surface of the first boom B1 has a condition that the offset angle detector 2 does not interfere with the operator cabin. That is, it becomes an obstacle to downsizing of the offset type excavator.
[0008]
In view of the above-described problems of the prior art, the present invention contributes to further downsizing of an offset power shovel without projecting outwardly of the offset power shovel even if it is a standard offset angle detector. An object of the present invention is to provide an offset angle detector arrangement structure for a power shovel that can be used.
[0009]
[Means and effects for solving the problems]
In order to achieve the above object, the first arrangement structure of the offset angle detector of the power shovel according to the present invention will be described with reference to FIGS. 1 to 3, for example. The rear end of the second boom B2 is pin-connected to the front end of B1 with a first vertical pin P1, the rear end of the third boom B3 is pin-connected to the front end of the second boom B2 with a second vertical pin P2, and the first The third boom B1, B3 is provided on a power shovel having an offset boom in which a hydraulic cylinder C4 and a rod R are installed between the side surfaces of the third boom B1, B3, and is operated to be offset to the first vertical pin P1 by expansion and contraction of the hydraulic cylinder C4. In the arrangement structure of the offset angle detector 2 that detects the offset angle θ with respect to the boom B3, (A) the lower surface B1D of the front end portion of the first boom B1 is formed lower than the lower surface B2D of the rear end portion of the second boom B2. (B) The main body 2a of the offset angle detector 2 is fixed to the lower surface B2D of the rear end portion of the second boom B2, and the lower surface B1D of the front end portion of the first boom B1 and the lower end surface P1D of the first vertical pin P1. One of these is characterized in that the tip of the detection link 2b of the offset angle detector 2 is pin-connected.
[0010]
According to the first configuration, the overall height of the offset angle detector 2 is reduced. Therefore, it is possible to prevent the offset angle detector 2 from protruding upward even during excavation work with a power shovel, for example, and the offset angle detector 2 is damaged due to interference with the opposing wall or the like. Can be resolved.
Further, since the offset angle detector 2 is installed on the lower sides B1D, B2D, and P1D of the first and second booms B1 and B2, it is unnecessary to consider that the offset angle detector 2 interferes with the operator cabin or the like. That is, the degree of freedom in design is increased.
That is, according to the first configuration, even an offset angle detector that is a standard product does not protrude greatly outward from the offset excavator, and can contribute to further miniaturization of the offset excavator.
Further, the first and second booms B1 and B2 improve the weather resistance against rainfall and snowfall in the offset angle detector 2.
[0011]
Second, in the arrangement structure of the offset angle detector of the power shovel having the first configuration, the cover 3 that protects one or both of the main body 2a of the offset angle detector 2 and the detection link 2b of the offset angle detector 2 from the outside. Is provided on one or both of the first and second booms B1 and B2.
[0012]
According to the second configuration, the cover 3 improves the weather resistance against wind and rain, wind and snow, etc. in the offset angle detector 2.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments according to the present invention will be described below with reference to FIGS. 1 is a side view of an offset type excavator (hereinafter simply referred to as “example machine”), FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 3 is a plan view of FIG. The configuration of the example machine itself shown in FIG. 1 is as described above. Therefore, the redundant description of the example machine is omitted, and the arrangement structure of the offset angle detector in FIG.
[0016]
As shown in FIGS. 1 to 3, the front end surface of the first boom B1 has concave portions B1a and B1b with forward openings at the vertical position. The portions of the recesses B1a and B1b are formed to be thickest in the vertical direction in the figure (dimension W1 in the figure) at the tip of the first boom B1. On the other hand, the rear end surface of the second boom B2 has convex portions B2a and B2b protruding rearward at the vertical position. These convex portions B2a and B2b are also formed to be thickest in the substantially vertical direction in the figure (dimension W2 in the figure) in the entire second boom B2. The concave portions B1a and B1b and the convex portions B2a and B2b are provided with coaxial longitudinal holes, respectively. And convex part B2a is inserted in recessed part B1a, and the upper side 1st vertical pin P1a is inserted in these vertical holes. On the other hand, the convex portion B2b is inserted into the concave portion B1b, and the lower first vertical pin P1b is also inserted into these vertical holes. Thus, the second boom B2 can turn around the first vertical pin P1 (that is, the upper and lower first vertical pins P1a and P1b). Further, as is clear from the above description, the size relationship between the dimension W1 and the dimension W2 is “W1> W2.” Therefore, the upper surface B1U of the front end portion of the first boom B1 is formed at a position higher than the upper surface B2U of the rear end portion of the second boom B2. Therefore, a tall offset angle detector body 2a is fixed to the upper surface B2U of the rear end portion of the second boom B2, while the tip of the low offset angle detection link 2b is fixed to the upper surface B1U of the tip portion of the first boom B1. Are connected to the pin.
[0017]
According to the first embodiment, the tall offset angle detector main body 2a is fixed to the upper surface B2U of the second boom B2 at the low position, while the tall offset angle detection link 2b is at the high position. Since the first boom B1 is extended to the upper surface B1U, the total height of the offset angle detector 2 is lowered. Accordingly, even during excavation work with a power shovel, for example, the offset angle detector 2 does not protrude outward, and therefore, the offset angle detector 2 is damaged due to interference with the opposing wall or the like. It can be lost. Further, since the offset angle detector 2 is installed between the upper surfaces B1U and B2U of the first and second booms B1 and B2, there is no need to consider the relationship with the operator cabin and the like, and the degree of design freedom is accordingly increased. Get higher. That is, according to the above-described embodiment, even an offset angle detector which is a standard product does not protrude greatly to the outside of the offset type excavator, and can contribute to further downsizing of the offset type excavator.
[0018]
Other examples will be listed below.
[0019]
(1) In the above embodiment, the tip of the offset angle detection link 2b is pin-connected to the upper surface B1U of the tip portion of the first boom B1, but the above-described effect is achieved even if the pin is connected to the upper end surface P1U of the upper first vertical pin P1a. An effect can be obtained.
[0020]
(2) The offset excavator of the above embodiment has a relationship of “W1> W2.” Therefore, as shown in FIGS. 2 and 3, the lower surface B1D of the front end portion of the first boom B1 is formed lower than the lower surface B2D of the rear end portion of the second boom B2. Accordingly, the offset angle detector main body 2a is fixed to the lower surface B2D of the rear end portion of the second boom B2, while the tip of the offset angle detection link 2b is pin-connected to the lower surface B1D of the front end portion of the first boom B1. good. Further, the tip of the offset angle detection link 2b may be pin-connected to the lower end surface P1D of the lower first vertical pin P1b. In this way, the first and second booms B1 and B2 protect the offset angle detector 2 from rainfall and snowfall. That is, the weather resistance of the offset angle detector 2 is improved.
[0021]
(3) FIG. 2 illustrates that the cover 3 that protects the offset angle detector 2 from the outside is detachably extended from the second boom B2. In this way, the cover 3 protects the offset angle detector 2 from wind and rain. That is, the weather resistance of the offset angle detector 2 is improved. Depending on the specifications of the offset type excavator (for example, due to restrictions on hose piping or the like), the entire offset angle detector 2 may not be covered with the cover 3 in some cases. In such a case, it is desirable to cover either one of the offset angle detector main body 2a and the offset angle detection link 2b with the cover 3. The cover 3 may extend from either one or both of the first and second booms B1 and B2, and it is desirable to determine this according to the specifications of the offset type excavator.
[Brief description of the drawings]
FIG. 1 is a side view of an offset excavator according to an embodiment.
FIG. 2 is a partially enlarged view of FIG.
FIG. 3 is a plan view of FIG. 2;
FIG. 4 is a diagram showing an example of the arrangement structure of an offset angle detector of a conventional power shovel.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Vehicle body 2 Offset angle detector 2a Offset angle detector main body 2b Offset angle detection link 3 Cover B1 1st boom B1U 1st boom tip part upper surface B1D 1st boom tip part lower surface B2 2nd boom B2U After 2nd boom End upper surface B2D Second boom rear end lower surface B3 Third boom P1 First vertical pin P1U First vertical pin upper end surface P1D First vertical pin lower end surface P2 Second vertical pin C4 Hydraulic cylinder (offset hydraulic cylinder) )
R Rod θ Offset angle

Claims (2)

The rear end of the second boom (B2) is pin-connected with the first vertical pin (P1) to the front end of the first boom (B1) that can be raised and lowered on the vehicle body (1), and is connected to the front end of the second boom (B2). The rear end of the third boom (B3) is pin-connected with the second vertical pin (P2), and the hydraulic cylinder (C4) and the rod (R) are connected between the side surfaces of the first and third booms (B1, B3). Offset angle for detecting the offset angle (θ) with respect to the third boom (B3), which is provided on a power shovel having an offset boom that is constructed, and that is offset to the first vertical pin (P1) by expansion and contraction of the hydraulic cylinder (C4). In the arrangement structure of the detector (2),
The lower surface (B1D) of the front end of the first boom (B1) is shaped lower than the lower surface (B2D) of the rear end of the second boom (B2), and the lower surface (B2D) of the rear end of the second boom (B2) ), The main body (2a) of the offset angle detector (2) is fixed, and either the lower surface (B1D) of the tip of the first boom (B1) or the lower end surface (P1D) of the first vertical pin (P1) An arrangement structure of an offset angle detector for a power shovel, wherein the tip of the detection link (2b) of the offset angle detector (2) is pin-connected to one of them. In the arrangement structure of the offset angle detector of the power shovel according to claim 1,
A cover (3) for protecting one or both of the main body (2a) of the offset angle detector (2) and the detection link (2b) of the offset angle detector (2) from the outside is attached to the first and second booms (B1, B1, B2). B2) An arrangement structure of an offset angle detector for a power shovel, which is provided in one or both of the above.

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