JP3074478U - Power shovel boom mechanism - Google Patents

Abstract

(57) [Problem] To provide a boom mechanism of a power shovel that can be extended with a simple configuration while suppressing the length of an airframe. A boom mechanism of a power shovel comprises a telescopic boom (2) for attaching a required work attachment such as a bucket (3) to a tip thereof, and a support boom (1) for supporting the telescopic boom (2) rotatably over a vertical angle range. The telescopic boom 2 protrudes so as to extend the support portion side supported by the support boom 1 to the rear, and protrudes to form a retreat portion 2a which can be arranged in parallel along the support boom 1, and extends and contracts to the retreat portion 2a. The telescopic boom 2 is constituted by the telescopic boom with the mechanism retracted.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a boom mechanism of a power shovel including a telescopic boom for mounting a work attachment such as a bucket and a supporting boom, and more particularly to a boom mechanism of a power shovel capable of securing a large radius working area while suppressing an increase in the length of an airframe.

[0002]

[Prior art]

 Power shovels used in general civil engineering construction sites connect an arm to the tip of a support boom, and attach a work attachment such as a bucket to the tip of the boom mechanism. By providing the above, various work according to the work attachment is enabled.

[0003]

[Problems to be solved by the invention]

 However, in order to improve the working environment and efficiency of civil engineering construction work, it is necessary to lengthen the boom mechanism of the power shovel, while the overall configuration dimensions of the equipment are limited due to restrictions on transportation and working conditions. Restrictions were imposed, and even if a telescopic mechanism was incorporated, the extension length had to stay within the range according to the length of the arm, so the extension distance was limited.

An object of the present invention is to provide a boom mechanism for a power shovel comprising a telescopic boom for attaching a required work attachment such as a bucket to a tip thereof, and a supporting boom that supports the telescopic boom so as to be rotatable over a vertical angle range. An object of the present invention is to provide a boom mechanism of a power shovel that can be extended with a simple configuration while suppressing the length of the fuselage.

[0005]

[Means for Solving the Problems]

 In order to solve the above problems, the gist of the present invention consists of a telescopic boom that attaches a required work attachment such as a bucket to the tip, and a support boom that rotatably supports the telescopic boom over a vertical angle range. In the boom mechanism of a power shovel, the telescopic boom extends backward from a support portion supported by the support boom to form a retreat portion that can be parallel to the support boom, and is attached to and detached from the support boom at the retreat portion. It has a fixing mechanism for fixing as much as possible.

[0006] The boom mechanism of the power shovel having the above-described configuration is configured such that the support portion side of the telescopic boom is extended rearward and the telescopic boom is at the retracted position, so that the telescopic mechanism is elongated to near the base end of the support boom. Therefore, it is possible to construct a large-stroke telescopic boom corresponding to the entire length of the telescopic boom extending to the retreating portion without increasing the overall length of the fuselage.

[0007] The retractable boom is provided with a fixing mechanism for detachably and integrally fixing the retractable boom in parallel with the support boom, so that when the telescopic boom is fixed to the support boom, the support boom is driven. Since the telescopic boom can be operated by the system, the operation of the arm within the operating angle of the supporting boom is not required, and the operation of the arm can be made more efficient without the need for drive control of the telescopic boom. The fixing mechanism is constituted by a pin mechanism for removably fixing the retractable portion of the telescopic boom at the base end side of the support boom, so that the operation can be easily and reliably fixed by a simple fixing mechanism. The telescopic boom can be further lengthened by interposing a collapsible arm at the end where the work attachment is attached.

[0008]

[Embodiment of the invention]

 An embodiment of the invention will be described below with reference to the drawings. FIG. 1 is a side view of a power shovel using the boom mechanism of the present invention. A telescopic boom 2 is connected to the tip of the support boom 1, and a boom mechanism having a work attachment such as a bucket 3 attached to the tip thereof is provided on a turntable 4 so as to be able to stand up and down by a hydraulic cylinder or the like, and an endless track 5 is attached to this. This constitutes a power shovel.

The base end of the support boom 1 is pivotally supported on a fulcrum 4 a of a swivel 4. A base end of a drive cylinder 8 for tilting the support boom 1 up and down in an angle range A from a horizontal posture to a substantially vertical position is attached to the swivel 4, and the other end is connected to a fulcrum 1 a of the support boom 1. The telescopic boom 2 is pivotally supported on a fulcrum 1b provided at the tip of the support boom 1. The base end of the drive cylinder 9 for tilting the telescopic boom 2 up and down in a required angle range B exceeding the orthogonal position from the angle position in parallel with the support boom 1 is attached to the support boom 1, and the other end of the telescopic boom 2 is It is connected to the action point 9a.

The telescopic boom 2 forms a receding portion 2a that projects from the support portion side supported by the support boom 1, that is, the fulcrum 1b side, so as to extend rearward, and can be arranged in parallel along the support boom. The telescopic boom 2 is configured by arranging a telescopic telescopic mechanism inside the entire length L of the telescopic boom 2 including the retreating portion 2a.

The retractable portion 2a of the telescopic boom 2 is provided at the base of the support boom 1 with a fixing mechanism including fixing members 10a, 10b, etc., from which pins can be inserted and withdrawn to fix the retractable portion 2a integrally with the support boom 1. Prepare near. The telescopic boom 2 is provided with a collapsible arm 11 at the tip end of an extension 2b thereof. The collapsible arm 11 holds the bucket 3 and the like via the collapsible arm 11, and a hose reel 2c attached to the telescopic boom 2 via the hose reel 2c. To supply hydraulic pressure and the like to the tiltable arm 11.

By configuring the boom mechanism as described above, the telescopic boom 2 can be angled by the drive cylinder 9 in the case of remote work where the distance to the work object is large, such as when the work object in front of the fuselage cannot be approached. Is adjusted to extend the extension portion 2b forward. Also in the case of low-place work in which the work target is located lower than the machine body, the angle of the telescopic boom 2 is adjusted downward in the same manner as described above, and the extension portion 2b is extended downward.

FIG. 2 is an enlarged view of the tiltable arm shown in FIG. 1 in a folded state. The retractable arm 11 is rotatably supported on a fulcrum 21 provided at the lower end of the distal end of the extension 2b. In addition, a series fixing mechanism including fixing members 22a, 22b, etc., from which a pin for integrally fixing in series with the extension 2b can be inserted and removed is provided at the upper end of the tip of the extension 2b. Further, suspension fixing members 23a and 23b for suspending and fixing the folded arm 11 to the telescopic boom 2 with a shackle or the like are provided. When transferring the airframe, as shown in the figure, the in-line fixing mechanisms 22a and 22b are opened, and the collapsible arm 11 is folded and fixed together with the bucket 3 and the like by the hanging fixing mechanisms 23a and 23b.

The operation of a work attachment such as the bucket 3 will be described. The bucket 3 or the like is exchangeably supported at the tip of the collapsible arm 11 via a fulcrum 11a, and is connected to the action point 3a. One end 24a of the mechanism 24 is connected to the retractable arm 11, and the drive cylinder 25 is connected via the two-node link mechanism 24. The drive cylinder 25 receives the hydraulic oil through the hose reel 2c and swings the bucket 3 and the like forward and backward through the two-node link mechanism 24. Breakers and other construction attachments can be installed in the usual way.

FIG. 3 is a side view showing the power shovel of FIG. 1 when working at heights. When working at a high place where the work target is located above the machine body, the telescopic boom 2 is arranged in parallel with the support boom 1 by the drive cylinder 9 and supported by the retracting portion 2a of the telescopic boom 2 by a fixing mechanism including fixing members 10a and 10b. The boom 1 is fixed, and the support boom 1 with the body fixed is tilted. By this tilting operation, the angle of the telescopic boom 2 is adjusted upward to extend the extending portion 2b upward.

As described above, the boom mechanism of the power shovel configured as described above has a fixing mechanism for extending the support portion side of the telescopic boom backward, and the retreating portion is detachably fixed in parallel with the support boom. As a result, the entire length of the telescopic boom extending to the vicinity of the base end of the support boom can be used as the telescopic mechanism. The stroke boom could be constructed. For work within the operating range of the support boom, the telescopic boom can be fixed to the support boom and the telescopic boom can be operated by the drive system of the support boom. Can be. Therefore, the boom can be extended to the work place even in dangerous places such as slopes and debris, or when working in deep holes, and work can be performed safely and efficiently.

[0017]

[Effect of the invention]

 The boom mechanism of the power shovel of the present invention has the following effects. The length of the telescopic boom can be extended with a simple configuration, and the operability of the telescopic boom is improved, while suppressing the length of the fuselage. Therefore, the above-mentioned power shovel can cover a wide range of work without requiring a special work machine at a construction site of a civil engineering construction having a poor work environment such as a high place or a low place, so that the work environment can be improved and the work environment can be improved. The efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a side view of a power shovel using a boom mechanism according to the present invention.

FIG. 2 is an enlarged view of the retractable arm in FIG.

FIG. 3 is a side view of the power shovel of FIG.

[Explanation of symbols]

 Reference Signs List 1 support boom 1a fulcrum 1b fulcrum 2 telescopic boom 2a retreat 2b extension 3 bucket (work attachment) 4 revolving base 4a fulcrum 8, 9 drive cylinder 9a action point 10a, 10b fixing member (fixing mechanism) 11 folding arm 21 fulcrum 22a, 22b Fixing member (series fixing mechanism) 23a, 23b Fixing member (suspension fixing mechanism) A Support boom angle range B Telescopic boom angle range L Basic length of telescopic boom

Claims (3)

[Utility model registration claims] 1. A boom mechanism for a power shovel comprising: a telescopic boom for mounting a required work attachment such as a bucket at a tip thereof; and a support boom for rotatably supporting the telescopic boom over a vertical angle range. , The support portion side supported by the support boom is extended rearward to form a retreat portion that can be juxtaposed along the support boom, and the retreat portion has a fixing mechanism for detachably fixing the support boom to the support boom. A boom mechanism for a power shovel. 2. The boom mechanism of a power shovel according to claim 1, wherein said fixing mechanism is constituted by a pin mechanism for removably fixing a retractable portion of the telescopic boom at a base end side of the support boom. . 3. The boom mechanism for a power shovel according to claim 1, wherein the telescopic boom is provided with a collapsible arm at a tip for attaching a work attachment.