KR100663102B1 - Boom attachment system for hydraulic excavator - Google Patents

Abstract

Provided is a boom attachment device for a hydraulic excavator that can easily perform insertion and removal of the installation pin from the outside of the vehicle without disassembling the side cover on the side of the installation pin.

Tanks and equipment mounted on the side of the mounting pins 11 while being detachably attached by the mounting pins 11 to the levo frames 3 rotatably mounted on the lower running body. In the boom attachment device of the hydraulic excavator provided with the side cover 13 which covers the mounting apparatus, etc. WHEREIN: A non-arrangement space of the mounting apparatus is provided on the extension line of the axis line NN of the installation pin 11, and the axis line ( The opening part 14 which has the size which can insert the installation pin 11 at least is provided in the site | part of the side cover 13 on the extension line of NN. The opening 14 may have a predetermined size that allows inspection and / or maintenance of the mounting apparatus.

Mounting pin, boom

Description

Boom Attachment System of Hydraulic Excavator {BOOM ATTACHMENT SYSTEM FOR HYDRAULIC EXCAVATOR}

1 is a side view of a hydraulic excavator to which the boom attachment device of the hydraulic excavator according to the present invention is applied.

2 is a cross-sectional view taken along the line A-A in FIG.

3 is a cross-sectional view taken along the line B-B in FIG.

4 is a view of FIG. 3 seen from the Z side.

5 is an attached view of a blank cap of the opening of the side cover.

6 is an attached view of the opening and closing cover of the opening of the side cover.

7 is a top view of an example of a boom attachment device of a hydraulic excavator according to the prior art.

8 is a view of FIG. 7 seen from the Y side.

9 is a side view of another example of the boom attachment part of the hydraulic excavator according to the prior art.

10 is a cross-sectional view of an example of the installation pin portion according to the prior art.

(Explanation of the sign)

1, 21... Lower running bodies 2, 22... Upper swing structure

3, 23... Levoframe 4, 24... Cab                 

5... Machine cap 6.. Counterweight

7, 27... Fuel tanks 8, 28, 28A... Hydraulic oil tank

9, 29... Hydraulic equipment 10.. Hydraulic excavator

11, 31... Mounting pins 12a, 12b, 32a, 32b... Bracket

12c... Pinhole 12d... guide

13, 33... Side cover 14.. Opening

15... Bonnet 16.. Blank Cap

17... Opening cover 18, 38... Boom

18a, 38a... Proximal end 18b... Pinhole

19... Boom cylinder 20.. Working machine

28a... Space

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boom attachment device for a hydraulic excavator, and more particularly, to a boom attachment device for a hydraulic excavator that facilitates attachment and detachment of an installation pin.

In a typical hydraulic excavator, an upper swinging body is rotatably mounted on an upper portion of a lower traveling body, and a work machine is mounted to a front portion of the upper swinging body so that the boom, the arm and the bucket are pivotably connected. By operating the work machine and traveling on the lower running body, work such as excavation and loading of the earth and sand is carried out.                         

7, 8 has shown the attachment structure of the boom in the base end side of the working machine of a hydraulic excavator. As shown in the same drawing, the base end portion 38a of the boom 38 is a pair of left and right brackets provided opposite to each other on the levo frame 23 of the upper swinging body 22 mounted on the lower running body 21 ( By attaching the installation pin 31 to the predetermined hole of 32a, 32b, it is attached rotatably.

On the other hand, the upper swinging structure 22 has a narrow circular levo so that the cab 24, the fuel tank 27, the working oil tank 28, the hydraulic equipment 29, and the like, in addition to the work machine 20 are accommodated in the turning radius. It must be arranged on the frame 23 with a minimum gap. For this reason, the working oil tank 28 etc. are arrange | positioned at the side part of the bracket 32a, 32b into which the installation pin 31 is inserted, especially in the extraction channel of the axial center direction of the installation pin 31. As shown in FIG. And these tanks 27 and 28, the hydraulic equipment 29, etc. are covered with the side cover 33 etc. which were provided in the outer surface of the levo frame 23. As shown in FIG.

In such a hydraulic excavator, it is necessary to dismantle the boom 38 from the upper swing body 22 at the time of transportation or maintenance, and therefore the installation pin 31 must be taken out of the brackets 32a and 32b.

However, since the hydraulic oil tank 28, the side cover 33, etc. are arrange | positioned on the withdrawal path | route of the installation pin 31, when disassembling the boom 38, these hydraulic oil tank 28 and the side cover 33 are carried out. Must be dismantled in advance. Therefore, there is a problem that the work is complicated and takes a long time.

For this reason, some prior art regarding the shape and installation place of a tank, an apparatus, etc. is proposed conventionally so that the insertion pin may be inserted and removed easily.

As a prior art of a boom attachment of a construction machine, for example, according to Japanese Patent Laid-Open No. 10-18347, as shown in Fig. 9, a pair of vertical plates on the levo frame 23 of the upper swing body 22 is shown. Bosses 34a and 34b are provided. Insert the base end boss 38a of the boom 38 between the pair of vertical plate bosses 34a and 34b, and install the pin 31 into the hole of the vertical plate bosses 34a and 34b and the hole of the base end boss 38a. ) Is detachably pivoted. In addition, the cab 24 is mounted on one side of the pair of vertical plate bosses 34a and 34b, and on the other side, mounting equipment such as fuel tank 27, hydraulic oil tank 28A and hydraulic equipment 29 is provided. I am placing it. And the site | part of the hydraulic oil tank 28A which matches the extension line of the axial center of the installation pin 31 is formed in the space part 28a which the installation pin 31 which moves on this extension line does not interfere.

As a result, it is described that the extraction operation can be easily performed while the installation pin 31 is pulled out while the installation pin 31 is pulled out.

As another prior art, for example, according to Japanese Patent Application Laid-Open No. 63-61460, as shown in FIG. 10, in a lateral position of a cab 43 mounted through a cushioning material not shown in the swinging structure 42, a boom A 47 is attached to the swinging structure 42 so that the swinging pin 42 can swing. And in order to insert this installation pin 41, the hole 45 is provided in the side wall 44 of the cab 43 which faces the end surface of the installation pin 41. As shown in FIG. And the cushioning material 46 which contacted or approached the end surface of the installation pin 41 is couple | bonded with the hole 45 provided in the side wall 44 of the cab 43 so that removal is possible.

Thereby, it is described that the shake of the cab 43 is prevented by the cushioning material 46 between the cab 43 and the installation pin 41 during the operation of the hydraulic excavator.

However, the prior art has the following problems.

In the technique described in Japanese Patent Application Laid-Open No. 10-18347, at the time of pulling out the mounting pin 31, the pulling out operation can be performed while the mounting pin 31 is pulled out from above, but at the outer periphery of the levo frame 23. In a narrow place such as between the side cover (corresponding to the side cover 33 in FIG. 7) and the vertical plate bosses 34a and 34b covering the mounting apparatus or the like, the force to be drawn out to the installation pin 31 cannot be sufficiently applied. It is very difficult to pull out the installation pin 31.

In addition, in the technique specified in Japanese Utility Model Laid-Open No. 63-61460, the hole 45 in which the cushion member 46 which contacts or approaches the end face of the installation pin 41 is formed in the side wall 44 of the cab 43. ) Is detachably coupled to each other, and shaking of the cab 43 is prevented by the cushion member 46 during the operation of the hydraulic excavator. However, there is no description about disassembling the installation pin 41, and even if the installation pin 41 is pulled out using the hole 45 of the cab 43, the hole 45 is small, so that the cab is small. It is very difficult to insert or pull out the installation pin 41 through the hole 45 inside the 43. Moreover, since the operation | movement which pulls out externally after inserting the installation pin 41 is not described, in the prior art disclosed, it is not easy to insert and remove the installation pin 41 easily.

SUMMARY OF THE INVENTION The present invention is directed to a boom attachment device for a hydraulic excavator that can easily insert and pull out installation pins from the outside of a vehicle without disassembling the mounting device and side cover on the side of the installation pin. It aims to do it.

In order to achieve the above object, the first invention of the boom attachment device of the hydraulic excavator according to the present invention, at the same time detachably attaches the base end of the boom by the installation pins to the levo frame pivotally installed on the lower running body, In the boom attachment device of the hydraulic excavator provided with the side cover which covers the mounting apparatus, such as a tank and an apparatus installed in the side part of a mounting pin, while providing the space which a mounting apparatus is not arrange | positioned on the extension line of the installation pin, The opening part which has the magnitude | size which can insert an installation pin at least is provided in the site | part of the side cover on the extension line of an axis line.

According to the first aspect of the invention, a space is provided in which the mounting apparatus is not arranged on the extension line of the mounting pin, and at least an opening having a size at which the installation pin can be inserted into the side cover portion on the extension line of the axis is provided. Since it is installed, the installation pin can be inserted and removed from the outside of the vehicle through the opening without removing or opening the side cover. Therefore, it is possible to apply a sufficient insertion force and a pulling force to the installation pins without the need for cumbersome pre-work such as removing the side cover, so that the installation pins can be easily inserted and removed in a short time.

According to a second invention, in the first invention, the opening has a predetermined size that allows inspection and maintenance of the mounting apparatus.

According to the second aspect of the present invention, the opening has a predetermined size for inspection and maintenance of the onboard equipment, so that the installation pins can be inserted and removed from the outside of the vehicle through the openings without removing or opening the side cover. At the same time, the openings can be used for inspection and maintenance work. This eliminates the need for cumbersome preliminary work such as removing the side cover, so that the inspection and maintenance work of the mounting apparatus can be easily performed.

In the first or second invention, the third invention has a configuration in which a guide for introducing the mounting pin into the pin hole is provided in the mounting pin insertion portion of the levo frame.

According to the third aspect of the present invention, since the guide for introducing the mounting pin into the pin hole is provided in the mounting pin insertion portion of the levo frame, the insertion pin is introduced into the pin hole by the guide at the time of insertion of the mounting pin. Easy to insert Therefore, the insertion pin can be inserted more easily without removing or opening the side cover.

EMBODIMENT OF THE INVENTION Below, the Example which concerns on this invention is described with reference to FIGS. In this embodiment, a small swing hydraulic excavator (hereinafter referred to as a hydraulic excavator) 10 will be described as an example.

1 is a side view of a hydraulic excavator 10 to which the boom attachment device of the hydraulic excavator according to the present invention is applied, and FIG. 2 is a cross-sectional view taken along the line A-A of FIG.

1 and 2, the upper swinging structure 2 is rotatably mounted on the upper portion of the lower traveling body 1 of the hydraulic excavator 10. As shown in FIG. On the levo frame 3 provided in the lower part of the upper swinging structure 2, the cab 4, the machine cap 5 incorporating the engine 5a, etc., the counterweight 6, and the fuel tank 7 ) And the hydraulic oil tank 8 are mounted. And the center part of the levo frame 3 is provided with the left and right pair of mountain-shaped brackets 12a and 12b facing each other, and forms a part of the work machine 20 between the left and right pair of brackets 12a and 12b. The proximal end of the boom 18 is inserted and is mounted so as to be swingable by the mounting pin 11. The boom 18 and the work machine 20 which has the arm and the bucket which are not shown are rocked by the expansion and contraction of the boom cylinder 19, the arm cylinder and the bucket cylinder which are not shown, respectively.

In addition, the fuel tank 7 and the hydraulic oil tank 8 and the hydraulic device 9 are arranged in the rear part of the cab 4, and in the rear and the lower part of the withdrawal path of the installation pin 11, respectively. (7, 8) and the hydraulic apparatus 9 are arrange | positioned so that it may not interfere with the installation pin 11 when the installation pin 11 is inserted or removed with respect to the bracket 12a, 12b.

3 is a cross-sectional view taken along the line B-B in FIG. 1.

In the same drawing, the proximal end 18a of the boom 18 of the work machine 20 attached to the levo frame 3 is attached to a pair of left and right brackets 12a and 12b provided on the levo frame 3 so as to face each other. It is attached rotatably by the installation pin 11. That is, the base end portion 18a of the boom 18 is held between the left and right pairs of brackets 12a and 12b, the respective pinholes 12c, 18b and 12c are matched, and the installation pin 11 is passed through the insertion hole. In this way, the boom 18 is pivotably mounted to the brackets 12a and 12b.

Moreover, the side cover 13 is provided on the levo frame 3 of the right end part of a vehicle, and the lower end part of the side cover 13 is being fixed to the levo frame 3 by the bolt 13a. In addition, a bonnet 15 extending from the upper side of the side cover 13 toward the vehicle body center direction is attached to the machine cap 5 (see FIG. 1) so as to be openable and closed. The hydraulic oil tank 8 and the hydraulic apparatus 9 are completely covered by these side covers 13 and the bonnet 15.

Then, at the site of the side cover 13 on the extension line of the axis line of the mounting pin 11 (center line of the pin holes 12c and 12c of the brackets 12a and 12b) NN, the mounting pin 11 Openings 14 of a predetermined size (diameter D) are provided for insertion, withdrawal, and for the worker to inspect and maintain the equipment. The opening part 14 is able to insert the tool used when inserting or removing the installation pin 11.

4 is a view of FIG. 3 viewed from Z. FIG. As shown in the same drawing, the pin hole 12 is introduced under the pin hole 12c on the right side of the bracket 12b (the side facing the inside of the machine cap 5) to introduce the installation pin 11 into the pin hole 12c. A semicircular guide 12d is provided concentrically with (12c).

5 and 6 have shown the attachment degree of the blank cap 16 of the opening part 14, and the opening / closing cover 17, respectively. When the opening portion 14 is not used, the opening portion 14 is closed by blocking means such as the blank cap 16 or the opening / closing cover 17.

Next, the effects will be described with reference to FIGS. 1 to 4.

As shown in Figs. 1 and 2, the fuel tank 7, the hydraulic oil tank 8, and the hydraulic equipment 9 are provided with an installation pin (when the insertion pin 11 is inserted into or removed from the brackets 12a and 12b. 11, the fuel tank 7, the hydraulic oil tank 8 and the hydraulic device 9 need to be removed at the time of inserting or removing the installation pin 11 as in the prior art. There is no.

In addition, as shown in Fig. 3, an opening portion is formed at the site of the side cover 13 on the extension line of the axis line of the mounting pin 11 (center line of the pinhole 12c of the brackets 12a and 12b) NN. 14), it is not necessary to disassemble or open the side cover 13 or the bonnet 15 at the time of insertion or removal of the installation pin 11.

And since the semicircular guide 12d is provided below the pinhole 12c of the right side of the bracket 12b, when inserting the installation pin 11 into the pinhole 12c, as shown in FIG. Introduction and insertion of the tip of the mounting pin 11 are easy.

Therefore, the boom 18 can be attached or dismounted easily with respect to the levo frame 3.

In addition, the opening 14 has a predetermined size that a worker can observe or insert his hand to inspect and maintain the equipment such as the working oil tank 8 and the hydraulic machine 9 in the machine cap 5. Therefore, not only the insertion or removal of the installation pin 11 through this opening portion 14, but also the inspection and maintenance work of the device can be easily performed.

As described above, according to the boom attachment device of the hydraulic excavator according to the present invention, when attaching or detaching the boom to the levo frame, without dismantling or opening the fuel tank, hydraulic oil tank, hydraulic equipment and side cover, etc. attached to the levo frame The operator can perform insertion and withdrawal of the installation pin through the opening provided in the side cover from the outside of the vehicle body. Therefore, since the boom can be easily attached to or detached from the levo frame, the effect of improving workability and shortening work time is very large.

Moreover, since the inspection and maintenance work of a device can be performed easily through an opening part, it is convenient.

Claims (3)

The boom 18 is detachably attached by the mounting pin 11 to the levo frame 3 which is pivotally mounted on the lower running body, and the tanks and equipment installed on the side of the mounting pin 11 are mounted. In the boom attachment device of a hydraulic excavator provided with a side cover (13) covering the device, A space in which the mounting apparatus is not arranged is provided on the extension line of the axis NN of the installation pin 11, and at least the installation pin 11 is inserted into the side cover 13 portion on the extension line of the axis NN. An opening 14 having a size that can be provided A boom attachment device for a hydraulic excavator, wherein a guide 12d for introducing the mounting pin 11 into the pin hole 12c is provided at the insertion pin 11 insertion portion of the levo frame 3. 2. The boom attachment device of a hydraulic excavator according to claim 1, wherein the opening portion (14) has a predetermined size for inspecting and maintaining the onboard equipment. delete

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