JP2003311168A - Attachment for hydraulic shovel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an attachment for a hydraulic shovel, of which the wearing parts can be easily exchanged at a low cost. <P>SOLUTION: The one clamping part 27 for cracking and the other clamping part 28 are installed in a freely driving manner for opening/closing, and these clamping parts 27, 28 are welded with a plurality of attaching parts 32, 33 respectively. These attaching parts 32, 33 are detachably fitted with respective socketed pawls 34, 35, and the attaching parts 32, 33 are fixed to the socketed pawls 34, 35 by inserting pins 44, 63 into the attaching parts 32, 33 and the socketed pawls 34, 35 respectively. The pins 44, 63 are prevented from being pulled in such a way that the grooves formed on their peripheral surface are fitted to the retainers installed in the pawls 34, 35 in the freely inserting and extracting manner. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an attachment for a hydraulic excavator that is driven to open and close.

[0002]

2. Description of the Related Art A hydraulic excavator is used for demolition of a building. At that time, a crusher 1 as an attachment as shown in FIG. 21 is attached to the tip of an arm which is usually attached with a bucket. There is.

Usually, the work object of the crusher 1 is concrete or rebar, and requires a strong crushing force, that is, a closing force, so that it can be freely opened and closed with the shaft 3 as a fulcrum with respect to one pressing body 2. The other pinching body 4 provided is opened and closed by a hydraulic cylinder (not shown).

Further, the crusher 1 is provided with a protrusion 5 inside the gripping portion in order to enhance the efficiency of the crushing work.
A claw 6 similar to a bucket is provided at the tip so that a member buried in soil, such as a concrete piece, can be easily excavated or picked.

The projection 5 at the grip portion and the claw 6 at the tip are
From the viewpoint of securing strength and cost reduction, it is usually welded directly to the crusher, but it is worn by crushing work.

When the function of the projections 5 and the claws 6 is deteriorated due to the severe wear, parts having the shapes of the projections 5 and the claws 6 are formed by overlay welding or cutting the once worn parts with a gas burner. The repair method of welding is adopted.

However, since the overlay welding requires a great deal of time, the crusher 1 cannot be used for a long time, and the overlay welding alone maintains sufficient hardness for the projections 5 and the claws 6. Can not.

Further, the parts welding involves steps such as gas cutting and welding, which makes it impossible to use the crusher 1 for a long time, and if the welding work is inadequate, the joint strength may be insufficient. When welding, the material is bent by heat,
It may not be possible to maintain sufficient hardness and strength.

From these problems, the pressing body 2 of the crusher 1 is
There is a conventional technique in which the claw 6 and the like integrated with the 4 are made into separate parts.

For example, Japanese Patent Laid-Open No. 5-214819,
JP-A-5-311892 and JP-A-5-32148
As disclosed in Japanese Patent Laid-Open No. 7-213933 and Japanese Patent Laid-Open No. 7-213933, a separate pawl or the like is fitted to the opening / closing member of the crusher,
It is known to fix with bolts and nuts.

[0011]

The crushers disclosed in these publications have the following problems.

Although bolts and nuts are used as means for fixing the claws, they are easy to loosen and are difficult to remove when rusted. Therefore, when the worn claw is replaced with a new one, the head part of the rusted bolt is cut with a gas burner or the like to remove the claw, but such work is not easy.

Further, the above-mentioned claw is a dedicated part. However, the dedicated part causes a significant increase in cost, and since the claw is a dedicated part, the claw mounting side is also large. Need to be processed.

For example, Japanese Patent Laid-Open No. 5-214819,
JP-A-5-311892 and JP-A-5-32148
As shown in Japanese Patent Publication No. 7, a counterbore processing is applied to the attachment portion of the claw, but such processing also leads to an increase in cost.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an attachment for a hydraulic excavator in which worn parts can be easily replaced at low cost.

[0016]

According to a first aspect of the present invention, there is provided a pair of pressure members which can be opened and closed, and a plurality of mounting portions which are respectively welded to the pressure members. Work protrusions that are detachably fitted to these attachments, pins that are inserted into the attachments and work protrusions and that fix the work protrusions to the attachments, and work pins that can be inserted and removed inside the work protrusions. An attachment for a hydraulic excavator equipped with a retaining member for retaining the pin that has been fitted, and when the work protrusion is worn, remove the pin from the retaining member that can be inserted and removed, and fix the work protrusion to the mounting portion. Release, remove only the work protrusion from the mounting part that is integral with the pinch body, replace it with a new work protrusion, insert the pin again, and use the retaining member to stop the work protrusion. Provides an excavator attachment that can be easily replaced when worn Kill.

According to a second aspect of the present invention, the attachment portion of the hydraulic excavator attachment according to the first aspect is
An adapter that is attached to the shank tip of the excavation ripper is used, and the work protrusion uses a tip that is fitted to this adapter tip, and the adapter and the tip of the shank tip of the excavation ripper are effective. Utilizing this, the mounting portion and the working convex portion can be formed at low cost.

According to a third aspect of the present invention, in the attachment for the hydraulic excavator attachment according to the first aspect,
A tooth adapter that is attached to the tip of the excavation bucket is used, and the work protrusion is a tip that is fitted to this adapter. The portion and the work convex portion can be formed at low cost.

According to a fourth aspect of the invention, the pin in the hydraulic excavator attachment according to any one of the first to third aspects has an annular groove on the peripheral surface corresponding to the retaining member, and the retaining member is It uses an annular retainer that has an inner diameter that can be reduced from the outer diameter of the pin.By simply pressing the pin into the retaining member inside the work protrusion, the diameter of the pin is reduced in the groove on the peripheral surface of the pin. By fitting the inner diameter of the retainer,
It is easy to prevent the pin from coming off.

According to a fifth aspect of the present invention, the work convex portion of the hydraulic excavator attachment according to any one of the first to fourth aspects is provided with a picking claw provided at a tip of the pressing body, and a pressing force. It is equipped with a protrusion for crushing provided on the gripping part of the body, and when the nail and protrusion are worn,
Remove the pin from the retaining member that can be inserted / removed, release the fixing of the claw and the projection to the mounting part, remove only the claw and the projection from the mounting part that is integral with the clamp body, replace it with a new claw and the projection, and then try again. It is possible to provide an attachment for a hydraulic excavator in which only the inexpensive claws and protrusions can be easily replaced when worn by inserting the pin and retaining it with the retaining member.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to one embodiment shown in FIGS. 1 to 19 and another embodiment shown in FIG.

As shown in FIG. 2, the hydraulic excavator is
An upper revolving structure 13 is provided on a lower traveling structure 11 traveling by a crawler track so as to be horizontally rotatable via a revolving unit 12, and a power source device 14 such as an engine and a hydraulic pump driven by the engine is provided on the upper revolving structure 13. A cab 15 for protecting the operator and a working device 16 driven by hydraulic pressure are mounted respectively.

In this working device 16, a boom 21 pivotally supported by the upper swing body 13 is vertically rotated by a boom cylinder 22, and an arm 23 pivotally supported by the tip of the boom 21 is moved forward and backward by an arm cylinder 24. The attachment 25, which is pivoted on the tip of the arm 23 instead of the bucket, is pivoted by the bucket cylinder 26.

Further, the attachment 25 is attached to one of the pinching members 27 rotatable by a bucket cylinder 26.
The other pressure member 28 is rotatably supported by a shaft member 29, and a pair of pressure members 27 and 28 can be opened / closed by a hydraulic cylinder (not shown) built in the attachment 25. It is provided in.

As shown in FIG. 1, three mounting portions 32 arranged at equal intervals via a space 31 are welded to the tip of one pressing body 27, and the other pressing body 28 is attached. The attachment portions 33 are welded to the tip of each of the two at two locations corresponding to the space 31.

Each of the mounting portions 32 provided at the tip of one of the pressing members 27 has a gripping claw 34 as a socket-like working convex portion.
Is detachably fitted, and each mounting portion 33 provided at the tip of the other pressing member 28 is detachably fitted with a picking claw 35 as a socket-shaped work convex portion. There is.

As shown in FIG. 2, a crushing projection 36 is provided as a working projection on the gripping portion of the other pressing member 28 facing the one pressing member 27.

3 to 9, the mounting portion 32 on the side of the three claws
The details of the nail 34 will be described.

As shown in FIG. 3, the mounting portion 32 is provided with two holes 41 and 42, and the claw 34 is provided with a long hole 43. Pin the hole 42 on the tip side of the mounting portion 32 and the long hole 43 of the claw 34.
44 is inserted, and the mounting portion 32 and the claw 34 fitted to the mounting portion 32 are fixed by the pin 44.

As shown in FIG. 4, a groove 45 concentric with the hole 42 is provided on one side surface of the mounting portion 32, and a retainer 46 as a pin retaining member is fitted into the groove 45. There is.
The retainer 46 is retained by the groove 45 by being locked by the inner surface of the socket-shaped claw 34.

The retainer 46 held in the pawl 34 in this manner
When the pin 44 is fitted in, the annular groove 47 formed in the peripheral surface of the pin 44 is fitted in the retainer 46 to prevent the pin 44 from coming off.

As shown in FIG. 5, the annular groove 47 formed on the peripheral surface of the pin 44 is formed relatively shallow and the retainer is formed.
It is possible to insert and remove from 46. Further, chamfered portions 48 formed by chamfering the peripheral edge portion are provided at both ends of the pin 44, and the chamfered portion 48 facilitates insertion of the pin 44.

As shown in FIG. 6, although the retainer 46 is formed in an annular shape, a cutout portion 49 is provided in a part thereof, and the cutout portion 49 allows the inner diameter to be enlarged and reduced.

That is, the inner diameter portion 46a of the retainer 46
Is formed to have a smaller diameter than the outer diameter of the pin 44, and temporarily expands when the pin 44 is inserted, but at the position of the groove 47 of the pin 44, the diameter is reduced by the restoring force of the material, and the pin 47 is fitted into the groove 47. .

A chamfered portion 46b with a rounded corner is provided on one side and the other side of the inner diameter portion 46a of the retainer 46.
The groove 47 of the pin 44 can be inserted into and removed from the retainer 46.

The mounting portion 32, as shown in FIG.
Using an adapter 32a attached to the tip of the shank 52 of the excavation ripper 51 pulled by the bulldozer,
The claw 34 is fitted on the tip of the adapter 32a and the pin 44a
The chip 34a fixed by is used. As shown in FIG. 7, a protector 53 that protects the tip end of the shank 52 and the adapter 32a is provided in the hole 41 of the mounting portion 32.
It is fixed by the pin 54.

8 and 9 show the mounting portion 32,
A convex portion 55 that fits with the claw 34 is formed on the tip side of the hole 42 into which the pin 44 is inserted, and a surface 56 that is welded to the pinching body 27 is formed on the opposite side portion.

10 and 11 show the socket-shaped claw 34, and a V-shaped concave portion which fits the convex portion 55 of the mounting portion 32 inside the chip main body portion 57 in which the elongated hole 43 is provided. 58 is provided, and a knob 59 for picking concrete pieces, reinforcing bars, etc. is provided on the tip side of the recess 58.

Next, referring to FIG. 12 to FIG. 19, the details of the mounting portion 33 and the claw 35 on the two claw side will be described.

As shown in FIG. 12, the mounting portion 33 has a hole.
61 is provided, and a long hole 62 is provided in the claw 35. A pin 63 is inserted into the hole 61 of the mounting portion 33 and the long hole 62 of the claw 35, and the mounting portion 33 and the claw 35 fitted to the mounting portion 33 are fixed by the pin 63.

As shown in FIG. 13, a groove 64 concentric with the hole 61 is provided on one side surface of the mounting portion 33, and a retainer assembly 65 as a retaining member for retaining the pin is fitted into the groove 64. ing. The retainer assembly 65 is retained by the inner surface of the socket-shaped claw 35 and is retained in the groove 64.

When the pin 63 is fitted into the retainer assembly 65 held in the pawl 35 in this manner, the annular groove 66 formed in the peripheral surface of the pin 63 is fitted into the retainer assembly 65, and the pin 63 is fitted. Is stopped.

A chamfered portion 67 formed by chamfering the peripheral edge portion is provided at both ends of the pin 63, and the chamfered portion 67 facilitates fitting of the pin 63.

As shown in FIG. 14, the retainer assembly 65 comprises a coil-shaped retainer 68 and a holder 69 for fitting and holding the retainer 68.

Inner diameter portion of retainer 68 formed in a coil shape
68a has a smaller diameter than the outer diameter of the pin 63,
Since the diameter of the inner diameter portion 68a can be expanded and contracted, it is temporarily expanded when the pin 63 is inserted, but the groove of the pin 63 is expanded.
At the position of 66, the diameter is reduced by the restoring force of the material, and the groove 66 is fitted.

Since the groove 66 of the pin 63 is formed relatively shallow and is continuous with the pin outer diameter surface by an arcuate surface or an inclined surface,
The groove 66 of the pin 63 can be inserted into and removed from the retainer 68.

The holder 69 is a cylindrical rubber product and has a pin insertion hole 69a on one side, a retainer fitting port 69b on the other side, and a retainer 68 on the inside of the opening edge.
A locking convex portion 69c for locking is formed integrally.

As shown in FIG. 15, the mounting portion 33 is bolted to the tip of the bottom plate 71 of the excavating bucket.
The adapter 3 3a of the tooth 74 attached by the 72 and the nut 73 is processed and used, and the claw 35 is attached to the tip of the adapter 33a and fixed by the pin 63.
Use 5a.

16 and 17 show the adapter 33a, in which a convex portion 75 for fitting the chip 35a is formed on the tip side of the hole 61 into which the pin 63 is inserted, and the cutting line 7 is formed on the opposite side.
The cross section of the attachment portion 33 cut off by 6 and cut by the cutting line 76 is welded to the pressing body 28 as shown in FIG.

18 and 19 show the socket-shaped claw 35, and a V-shaped concave portion which fits into the convex portion 75 of the mounting portion 33 inside the chip main body portion 77 in which the elongated hole 62 is provided. 78 is provided, and a knob 79 for picking concrete pieces, reinforcing bars, etc. is provided in a flat shape on the tip side of the recess 78.

Next, the function and effect of the embodiment shown in FIGS. 1 to 19 will be described.

In FIG. 2, the undercarriage of the hydraulic excavator
The attachment 25 is transferred to a predetermined place by traveling by the 11, traveling by the upper revolving structure 13, and rotation of the boom 21 and the arm 23, and the attachment by the bucket cylinder 26.
While adjusting the angle of 25, the hydraulic cylinder in the attachment 25 opens and closes the other pressing body 28 with respect to the one pressing body 27, and the claws 34, 35 and the projection 36 crush the concrete into small pieces, Various works such as demolition of buildings and cutting of reinforcing bars.

When the nails 34, 35 are worn by these operations, the pins 44, 63 are hit by hitting one end surface of the pins 44, 63.
By applying an axial force to the pins 44 and 63, the pins 44 and 63 are forcibly removed from the retainers 46 and 68 and pulled out.

As a result, the claws 34 for the mounting portions 32, 33,
Since the fixing of 35 is released, only the worn claws 34, 35 are removed from the mounting portions 32, 33 integrated with the pressing bodies 27, 28. And
Instead, insert new claws 34 and 35 into the mounting parts 32 and 33,
Press the pins 44 and 63 again and press the retainers 46 and 68
By preventing 44 and 63 from coming off, only the claws 34 and 35 can be easily replaced when worn.

At this time, the pins 44, 63 are simply press-fitted into the retainers 46, 68 held inside the socket-shaped claws 34, 35, and the diameters are reduced in the grooves 47, 66 on the peripheral surfaces of the pins 44, 63. Retainer
By fitting the inner diameter portions 46a, 68a of the 46, 68, the pins 44, 63
Can be easily prevented.

The mounting portion 32 and the claw 34 on one side are the adapter 32a and the tip 3 at the tip of the shank 52 of the excavation ripper 51.
It can be formed at low cost by effectively utilizing 4a.

The other mounting portion 33 and the claw 35 are the adapter 33a and the tip 35a which constitute the tooth 74 of the excavating bucket.
It can be formed at low cost by effectively utilizing.

The above-mentioned mounting structure of the claws 34, 35 has a projection
It can be applied to the mounting structure of 36 as it is, and the projection 36 can be exchanged when it is worn by attaching and detaching the pin.

Next, FIG. 20 shows an attachment 81 corresponding to another embodiment of the present invention, in which one pinch body 27 is provided with the other pinch body 28 so as to be openable and closable. A plurality of mounting parts 32 are welded to the tip of the pressing body 27, and claws 34 as socket-like work convex parts are detachably fitted to these mounting parts 32, and these mounting parts 32 and claws 34 are attached. A pin 44 for fixing them is inserted into the retainer, and the pin 44 is detachably fitted into a retainer (not shown) as a retaining member held inside the claw 34 so as to be retained. .

Similarly, at the tip of the other pressing member 28, a plurality of mounting portions projecting between the claws 34 of the one pressing member 27 are attached.
33b are welded, and claws 35b as socket-like work convex parts are detachably fitted to these mounting parts 33b, and pins (not shown) for fixing these to the mounting parts 33b and claws 35b. Is inserted from below, and this pin is detachably fitted to a retainer (not shown) as a retaining member held inside the claw 35b so as to be retained.

For the mounting portions 32 and 33b, an adapter mounted to the shank tip of the excavation ripper is used, and the claws 34 and 35b are used.
Uses a chip fitted to the tip of this adapter.

The gripping portion of the pressing body 28 is provided with a crushing projection 36 as a work convex portion.
With the same structure as the mounting portion 33b and the claw 35b, it is possible to easily cope with wear.

As described above, the pawls 34 and 35 can be exchanged in a short time, so that the rest time can be greatly shortened.

Since the claws 34 and 35 are not welded, the repair cost can be greatly reduced, and there is no heat effect due to the welding.
The quality of 34 and 35 (hardness, mounting position) is not affected.

The claws 34 and 35 are inexpensive because they use parts (chips 34a and 35a) used in existing construction machines.

Since the mounting parts 32 and 33 do not require so complicated processing, they are easy to manufacture. It is also easy to attach removable claws 34, 35 in place of the existing welded type claws.

Since the bolts and nuts are not used to fix the claws 34 and 35, there is no problem of the bolts and nuts coming off due to loosening, and the problem that the bolts and nuts become rusty and difficult to remove.

The hydraulic excavator attachment can be applied to so-called crushers, dismantling machines, crushers, crushers and the like.

[0069]

According to the invention described in claim 1, when the working convex portion is worn, the pin is removed from the retaining member which can be inserted and removed, and the working convex portion is released from the mounting portion, and the pinching pressure is applied. By removing only the work convex part from the mounting part integrated with the body, replacing it with a new work convex part, inserting the pin again and retaining it with the retaining member, only the inexpensive work convex part can be easily replaced when worn We can provide attachments for hydraulic excavators.

According to the second aspect of the present invention, the mounting portion and the working convex portion can be formed at low cost by effectively utilizing the adapter and the tip at the shank tip of the excavation ripper.

According to the third aspect of the present invention, the tooth adapter and tip of the excavating bucket are effectively used,
The mounting portion and the working convex portion can be formed at low cost.

According to the fourth aspect of the present invention, by only press-fitting the pin into the retaining member inside the working convex portion, the reduced inner diameter portion of the retainer is fitted in the groove on the peripheral surface of the pin. ,
It is easy to prevent the pin from coming off.

According to the fifth aspect of the present invention, when the claw and the projection are worn, the pin is removed from the retaining member which can be fitted and removed, and the fixing of the claw and the projection to the mounting portion is released, so that A hydraulic excavator that removes only the claws and projections from the integrated mounting part, replaces them with new claws and projections, inserts the pin again, and uses the retaining member to stop the removal, so that only the inexpensive claws and projections can be easily replaced when worn. Can provide attachments for.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of an attachment for a hydraulic excavator according to the present invention.

FIG. 2 is a side view of the hydraulic excavator equipped with the same attachment.

FIG. 3 is a cross-sectional view showing one attachment portion and a claw of the above attachment.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a perspective view of one attachment portion of the attachment and a pin for fixing a claw.

FIG. 6A is a front view showing a retainer for preventing the pin from coming off, and FIG. 6B is a sectional view taken along line bb of FIG. 6A.

FIG. 7 is a side view of the excavation ripper.

FIG. 8 is a plan view showing one attachment portion of the above attachment.

FIG. 9 is a front view showing one attachment portion of the above attachment.

FIG. 10 is a plan view showing one claw of the above attachment.

FIG. 11 is a front view showing one claw of the above attachment.

FIG. 12 is a cross-sectional view showing the other attachment portion and the claw of the above attachment.

13 is a sectional view taken along line XIII-XIII in FIG.

FIG. 14 is an exploded perspective view showing a retainer assembly for preventing removal of a pin that fixes the other mounting portion and the claw of the attachment.

FIG. 15 is a cross-sectional view of the tip portion of the bottom plate of the excavation bucket.

FIG. 16 is a plan view showing a bucket tooth adapter that is processed on the other attachment portion of the attachment.

FIG. 17 is a front view showing the bucket tooth adapter of the same.

FIG. 18 is a plan view showing the other claw of the above attachment.

FIG. 19 is a front view showing the other claw of the above attachment.

FIG. 20 is a perspective view showing another embodiment of the hydraulic excavator attachment according to the present invention.

FIG. 21 is a perspective view showing an example of a conventional hydraulic excavator attachment.

[Explanation of symbols]

27 One clamp 28 The other clamp 32 Mounting part 33 Mounting part 34 Claws as work protrusions 35 Claws as work protrusions 36 Protrusion 44 pin 46 Retainer as a retaining member 46a Inner diameter 47 groove 51 Ripper for excavation 52 shank 32a adapter 34a chip 63 pin 65 Retainer assembly as a retaining member 66 groove 68 Retainer 68a Inner diameter 74 Tooth for excavation bucket 33a adapter 35a chip

Claims (5)

[Claims] 1. A pair of pressure members provided to be openable and closable, a plurality of mounting portions respectively welded to these pressure members, and a work protrusion detachably fitted to these mounting portions. A pin, which is inserted into the mounting portion and the work convex portion to fix the work convex portion to the mounting portion, and a retaining member for retaining the pin, which is removably fitted to the pin inside the work convex portion. Attachment for hydraulic excavator, which is characterized. 2. The mounting part uses an adapter mounted on the tip of the shank of the excavation ripper, and the working convex part uses a tip fitted on the tip of the adapter. Attachment for hydraulic excavator. 3. The hydraulic pressure according to claim 1, wherein the attachment portion uses a tooth adapter attached to the tip of the excavating bucket, and the working protrusion portion uses a tip fitted to the adapter. Excavator attachment. 4. The pin has an annular groove on the peripheral surface corresponding to the retaining member, and the retaining member uses an annular retainer having an inner diameter portion that can be reduced in diameter than the outer diameter of the pin. The hydraulic excavator attachment according to any one of claims 1 to 3. 5. The work convex portion is provided with a picking claw provided at a tip of the pressing body and a crushing projection provided at a gripping portion of the pressing body. Attachment for a hydraulic excavator according to any one of 1 to 4.