JP3546824B2 - Mounting structure of hydraulic shovel swing angle detector - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure of a swing angle detecting device for a hydraulic shovel provided with a swing bracket that enables the attachment to turn left and right.
[0002]
[Prior art]
Hereinafter, the piping structure of a general hydraulic excavator will be described in detail with reference to the drawings. FIG. 4 is a side view of a general hydraulic excavator provided with a swing bracket. In the figure, reference numeral 50 denotes a hydraulic excavator. The hydraulic excavator 50 includes a lower traveling body 51 which can travel freely, an upper revolving body 52 which is rotatably mounted on an upper portion of the lower traveling body 51, and an upper revolving body An attachment 53 is provided at a front portion of the attachment 52 so as to be rotatable vertically and horizontally. A bracket pivot 58 is provided at the front end of the upper swing body 52. A swing bracket 57 is attached to the front of the bracket pivoting portion 58 so as to be rotatable in the left-right direction.
[0003]
The attachment 53 includes a boom 54 having one end attached near the upper end of the swing bracket 57, an arm 55 having one end attached to the other end of the boom 54, and a bucket attached to the tip of the arm 55. 56. The boom 54 is vertically rotatable by a boom cylinder 54 a having both ends connected to the vicinity of the front end of the swing bracket 57 and to the boom 55. The arm 55 is rotatable by an arm cylinder 55a disposed between the back of the boom 54 and the end of the arm 55. Further, the bucket 56 is rotatable by a bucket cylinder 56a disposed between the bucket 56 and the back of the arm 55.
[0004]
[Problems to be solved by the invention]
The above-mentioned hydraulic shovel has been a machine for excavation work, but in recent years, its use has been diversified, and a structure (hereinafter referred to as a crane specification) that can perform hanging load work by attaching a hook to the tip of an arm has been developed. Many have appeared. In this suspended load operation, it is necessary to perform the operation by setting the swing angle to 0 degree (state in which the direction of the attachment is parallel to the traveling direction of the lower traveling body) in order to surely exhibit the suspending ability. It was difficult for the operator to intuitively perform the positioning.
[0005]
Therefore, conventionally, a structure for detecting a swing angle by preparing a limit switch and a cam corresponding to the limit switch has been known. In this case, a limit switch and a dedicated cam are required, and the number of parts is reduced. Reduction of the demand was desired. In addition, special specifications such as crane specifications are often retrofitted at the customer's request. In this case, it is extremely difficult to provide a cam and limit switch on a swing bracket and a member that has only a very small space such as a bracket pivot. Therefore, it has been desired to reduce the time required for the assembling work.
[0006]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a swing angle detection structure of a hydraulic shovel that aims to reduce the number of parts of an attachment swing angle detection device and improve assemblability. I do.
[0007]
[Means for Solving the Problems]
The present invention relates to an upper revolving structure, a bracket pivoting portion provided at the front end of the upper revolving structure with the axis of the boss facing up and down, and the boss of the bracket pivoting portion is rotatable about a vertical axis. A swing bracket having a boss pin-connected to the swing bracket, and a limit switch for detecting a rotation angle of the swing bracket; The swing bracket includes a box body that supports the boss on the upper revolving structure, the boss of the swing bracket is inserted between a pair of bosses of the bracket pivot portion, and the limit switch and the limit switch are provided on the circumferential surface of the boss of the swing bracket. The detected portion to be contacted is formed and processed, and the limit switch is attached to a lower surface of an upper plate of a box of the bracket pivoting portion. That.
[0008]
According to this, since the detected portion for the limit switch is directly formed on one boss of the swing bracket, it is not necessary to prepare a separate cam as in the conventional case, and the number of parts can be reduced. In addition, by forming a detected portion (for example, a notch) in advance at the time of manufacture, it is possible to easily configure a swing angle detecting device on site by simply attaching a limit switch or the like even when retrofitting the swing angle detecting device on site according to a customer's request. This leads to a significant reduction in working time.
[0009]
Further, since the limit switch can be housed in the box at the bracket pivotal portion, it is possible to prevent contact with earth and sand scattered by excavation and the like, and to improve the service life of the limit switch. . In particular, since the limit switch can be arranged near the lower side of the wide upper plate, it is possible to more reliably prevent the limit switch from getting wet with rainwater or the like.
[0010]
Note that, in the present invention, when the boss of the swing bracket is constituted by two pairs of bosses sandwiching each boss of the bracket pivot portion, the detected portion is positioned below the upper boss of the bracket pivot portion. It can be applied by processing and forming a boss located in the vicinity.
[0011]
Further, a mounting member for mounting the limit switch on the lower surface of the upper plate of the box may be configured to cover at least the lower surface of the limit switch.
[0012]
According to this, by covering at least the lower surface of the limit switch with the mounting member, it is possible to prevent contact with hydraulic piping passing through the bracket pivoting portion and the inside of the swing bracket, contact with scattered earth and sand, and the like. The service life of the limit switch can be improved.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a detailed side view of a main part showing a mounting structure of an angle detecting device for a swing bracket according to the present invention. FIG. 2 is a detailed view of a main part showing a cross section AA of FIG. FIG. 3 is a diagram showing a mounting structure of the limit switch. The components having the same configuration as the prior art are denoted by the same reference numerals, and description thereof will be omitted.
[0014]
In the figure, a bracket pivoting portion 58 provided at the front end of the upper revolving structure 52 is provided with a pair of bosses (upper boss, lower boss) 58b with their axial centers directed up and down at the tip. Each of the bosses 58b is supported by an upper plate 58a or a bottom plate 58d. The upper plate 58a and the bottom plate 58d are connected by a pair of side plates 58c, and are formed as a box-shaped strength member having a cavity therein.
[0015]
The swing bracket 57 includes two pairs of bosses 5 that sandwich the pair of bosses 58b from above and below. The pair of bosses 5 and the bosses 58b are connected by the pins 4 so that the swing bracket 57 Left and right rotation with respect to the bracket pivot 58 is enabled.
[0016]
On the lower surface of the upper plate 58a, there is provided a limit switch 1 disposed so as to abut on the circumferential surface of the boss 5b of the boss 5 of the swing bracket 57, which is located immediately below the upper plate 58a. . On the other hand, on the circumferential surface of the boss 5b, a notch 5a, which is a detected part, is provided so that the limit switch 1 is not in contact with the boss 5b when the swing angle of the swing bracket 57 is substantially 0 degree. Is provided. When the limit switch 1 detects that the swing angle is 0 degree, the electric signal is input to the controller through a harness (not shown) connected to the limit switch 1. Then, the controller performs control such as locking the operation pedal according to this signal.
[0017]
The mounting structure of the limit switch 1 to the upper plate 58a will be described. A block 3 is provided on the lower surface of the upper plate 58a, and the plate-shaped mounting member 2 having the concave portion 2a in the block 3 is bolted. It is connected. The limit switch 1 is accommodated in the recess 2 a of the mounting member 2. In this case, since the limit switch 1 can be arranged near the lower side of the wide upper plate 58a, the limit switch 1 can be prevented from getting wet with rainwater or the like. In addition, by covering the periphery of the limit switch 1 with the mounting member 2 or the like, it is possible to prevent contact with the hydraulic piping 7 passing through the bracket attachment portion 58 and the inside of the swing bracket 57, contact with scattered earth and sand, and the like. Therefore, the useful life of the limit switch 1 can be improved.
[0018]
Further, since the notch 5a for the limit switch 1 is formed directly on one boss 5b of the swing bracket 57, it is not necessary to prepare a separate cam as in the conventional case, and the number of parts can be reduced. In addition, by forming the notch 5a in advance at the time of manufacturing, when the swing angle detecting device is retrofitted on site, it can be easily configured only by attaching the limit switch 1 or the like according to the request of the customer, so that the working time can be reduced. This leads to a significant reduction.
[0019]
Here, the case where the notch 5a, which is the detected portion, is formed on the boss 5b of the swing bracket 57 has been described. However, the present invention is not limited to this. For example, a configuration may be adopted in which a protrusion is formed on the boss 5b. . In this case, the limit switch 1 may be arranged so as not to be in normal contact with the boss 5b and to be in contact only with the projection.
[0020]
【The invention's effect】
According to the present invention, since the detected portion for the limit switch is directly formed on one boss of the swing bracket, it is not necessary to prepare a separate cam as in the related art, and the number of parts can be reduced. In addition, by forming a detection target portion (for example, a notch) in advance at the time of manufacturing, it is possible to easily configure a swing angle detection device simply by attaching a limit switch or the like when retrofitting a swing angle detection device on site according to a customer's request or the like. This leads to a significant reduction in working time.
[0021]
In addition, since the limit switch can be housed inside the box at the bracket pivotal portion, it is possible to prevent contact with earth or the like scattered by excavation or the like, and to improve the service life of the limit switch. .
[0022]
In particular, since the limit switch can be arranged near the lower side of the wide upper plate, it is possible to more reliably prevent the limit switch from getting wet with rainwater or the like.
[0023]
Further, by covering at least the lower surface of the limit switch with the mounting member, it is possible to prevent contact with the hydraulic piping passing through the bracket pivoting portion and the inside of the swing bracket, contact with scattered earth and sand, and the like. Can be improved in the service life.
[Brief description of the drawings]
FIG. 1 is a detailed side view of a main part showing a mounting structure of an angle detecting device for a swing bracket according to the present invention.
FIG. 2 is a detailed view of a main part showing a cross section AA of FIG. 1;
FIG. 3 is a diagram showing a mounting structure of a limit switch.
FIG. 4 is a side view of a general hydraulic excavator provided with a swing bracket.
[Explanation of symbols]
1: Limit switch 2: Mounting member 5: Boss 5a: Notch 52: Upper revolving body 57: Swing bracket 58: Bracket pivot portion 58b: Boss [Necessity of proof] Required

Claims (3)

An upper revolving structure, a bracket pivoting portion provided at the front end of the upper revolving structure with the axis of the boss directed vertically, and a pin connected to the boss of the bracket pivoting portion so as to be rotatable around a vertical axis. A swing bracket having a boss, and a limit switch for detecting a rotation angle of the swing bracket,
The bracket pivoting portion is composed of a pair of bosses arranged vertically separated from each other, and a box body supporting the boss on the upper rotating body,
The boss of the swing bracket is inserted between a pair of bosses of the bracket pivot portion,
A detected portion that contacts the limit switch is formed on the circumferential surface of the boss of the swing bracket, and the limit switch is attached to a lower surface of an upper plate of a box of the bracket pivoting portion. Mounting structure of swing angle detection device for hydraulic excavator. Boss before Symbol swing bracket is constituted by two pairs of bosses sandwiching each of bosses of said bracket pivotally mounted unit, processing the boss said detected portion is positioned below and in the vicinity of the upper boss of the bracket pivotally mounted portion mounting structure of the swing angle detection device for a hydraulic excavator according to claim 1, characterized in that it is molded. The mounting structure for a swing angle detecting device for a hydraulic shovel according to claim 1 or 2, wherein a mounting member for mounting the limit switch to a lower surface of an upper plate of the box covers at least a lower surface of the limit switch .

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