JP2005061195A - Shroud mounting structure of excavating bucket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shroud mounting structure of an excavating bucket, which can mount a shroud on the bucket without wobble, and facilitates dismounting of the shroud if necessary. <P>SOLUTION: A bucket main body (10) of the excavating bucket has a lock plate (40) fixed thereto, and the shroud (30) has a side shape inclusive of a U-shaped side shape, and a mounting recess (33) which is extended in a lengthwise direction that is perpendicular to a widthwise direction of the shroud. Then an opening lower edge of the bucket main body is pinched by using the U-shaped side shape of the shroud, and the lock plate is housed in the mounting recess formed in the shroud, followed by preventing frontward slipout of the shroud from the lock plate by means of stopper members (50, 60). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a shroud mounting structure for an excavating bucket, and more particularly to a structure in which the shroud can be mounted without rattling and the shroud can be easily removed when necessary.

  For example, in a hydraulic excavator, an excavation bucket is attached to the tip of an operation arm, and the excavation bucket is operated to excavate earth or sand, or to remove and transport earth and sand, gravel, or rock (hereinafter simply referred to as earth and sand). Usually, the excavation bucket has a box shape in which the bucket body has an opening on the front surface, and a plurality of claws are attached to the lower edge of the opening of the bucket body, and excavation work is performed by striking the claws against the ground. It has become easier.

  By the way, the part between the claws at the lower edge of the opening of the bucket body collides with the earth and sand violently and rubs when scooping the earth and sand, so it is easy to wear. However, if the padding is repeated many times, heating and cooling are repeated to change the metal structure of the part or generate residual stress due to thermal cycling. Will deteriorate.

Therefore, a shroud is attached to a portion between the claw at the lower edge of the opening of the bucket body (see Patent Document 1, Patent Document 2, Patent Document 3, Patent Document 4, etc.).
JP 09-209392 A Japanese Utility Model Publication No. 62-181667 Japanese Utility Model Publication No. 63-45870 Japanese Utility Model Publication No. 01-24165

  However, in the shroud mounting structure described in the above-mentioned patent document, the shroud is opened at the lower end of the bucket body by bringing both ends of the shroud into contact with the claws or by holding projections on both sides of the shroud between the claws and the claw mounting portions. Since it is attached to the edge, the nail must be removed each time the shroud wears out and needs to be replaced, which is cumbersome.

  Further, in the shroud mounting structure described in Patent Documents 1 to 3, since both ends of the shroud are brought into contact with the claws to prevent the shroud from being loosened, if there is a gap between the shroud and the parts where the claws come into contact, the shroud is rattled. In addition, abnormal noise is generated during excavation or scooping work, which is uncomfortable, and the shroud and the claws contact with each other due to collisions, and the shroud may fall.

  An object of the present invention is to provide a shroud mounting structure for an excavation bucket in which the shroud can be mounted without rattling and the shroud can be easily removed when necessary.

  Therefore, the shroud mounting structure for a drilling bucket according to the present invention is a shroud mounting structure for a drilling bucket in which a shroud is mounted between adjacent claws at the lower end edge of the bucket body, and a lock plate is fixed to the bucket body. On the other hand, the shroud has a side surface shape including a U-shaped side surface, and the mounting groove is formed in the shroud extending in the front-rear direction, and the opening of the bucket body is formed at the side U-shaped portion of the shroud. The movement of the shroud in the vertical direction is described when the lower end edge portion is sandwiched, and the movement of the shroud in the lateral width direction is performed with the locking plate and the mounting recess when the locking plate is received in the mounting groove of the shroud. The shroud is restricted by the stopper member by the contact with the inner surface of the groove. Characterized in that it is forward retaining the lock plate.

  One of the features of the present invention is that a lock plate is accommodated in a mounting groove of the shroud by attaching a substantially U-shaped shroud on the side of the lower end edge of the bucket body, and the shroud is accommodated in that state. The stopper member prevents the lock plate from coming off forward.

  As a result, the shroud is restricted from moving upward or downward with respect to the lower end edge portion of the bucket body by the U-shape of the side of the lower end edge portion of the bucket body. The movement in the width direction (left-right direction) is restricted by the contact with the inner side surface of the slab, and further, the front member is prevented from coming off by the stopper member, so that the shroud may come off or come off regardless of the load applied to the shroud from any direction. In addition, the shroud can be securely attached, and there is little possibility of noise and rattling during excavation or rake work, and there is no risk of the shroud falling due to wear.

  Further, the stopper member only needs to prevent the shroud from coming off forward, and an excessive load is not applied. Therefore, the stopper member is not easily detached, and the shroud can be securely locked in the attached state.

  Further, by fitting the lock plate in the mounting groove of the shroud, the shroud does not tilt even if a lateral load is applied to the rear end portion of the shroud, and can be held in the intended posture.

  When the shroud is replaced, the stopper member may be removed, and the shroud can be easily replaced without the need to remove the claws as in the conventional case.

  For example, the following method can be used for locking the shroud and the lock plate. That is, a pin insertion concave groove is formed in the lock plate in the lateral width direction, and a retaining pin is urged in the protruding direction on the inner side surface of the pin insertion concave groove, and the upper side or lower side of the U-shaped side surface of the shroud The pin insertion concave groove and the lock plate pin of the shroud are formed when the pin insertion concave groove is formed extending in the lateral width direction in the portion of the shroud and the side U-shaped portion of the shroud sandwiches the lower end edge portion of the bucket body. A pin insertion hole is formed by matching the insertion groove, and a stopper pin is inserted into the pin insertion hole to prevent the shroud from coming forward, and the stopper pin prevents the lock plate from being fitted into the side fitting recess. By fitting the pins, it can be configured to prevent the sides from coming out from the pin insertion holes.

  The retaining pin only needs to be provided in a protruding direction on the inner surface of the pin insertion concave groove of the lock plate.For example, a slide groove is formed in the lock plate in a direction perpendicular to the pin insertion concave groove, and the retaining pin is provided. Although it may be fitted vertically or horizontally into the slide groove and biased in the protruding direction by a spring member, the processing of the lock plate is complicated.

  Therefore, an insertion recess is formed on the inner surface of the pin insertion groove of the lock plate, and an elastic body that holds the retention pin is inserted into the insertion recess so as to urge the retention pin. It is good.

  Hard rubber can be used for the elastic body, and the retaining pin can be made vertical and at least the front half of the pin can be exposed and held in the pin insertion groove.

  The following method can also be employed for locking the shroud and the lock plate. That is, the upper or lower side portion of the side surface U-shaped of the shroud is formed by penetrating the stopper plate insertion hole vertically, and the portion of the lower end edge of the opening of the bucket body is sandwiched by the side U-shaped portion of the shroud In this state, the shroud can be prevented from coming off by inserting the stopper plate into the insertion hole and fixing the stopper plate to the lock plate.

  The lock plate and the stopper plate may have pin holes formed in both, and a locking pin may be press-fitted there to fix both. However, for secure fixing, it is fixed by screwing (including bolts). It is good to do.

  The shroud only needs to have a side surface shape including a U-shaped side surface, and can sandwich a portion of the opening lower end edge of the bucket body. For example, the upper side and the lower side of the side U-shape may be formed into a side shape having the same length, but the processing of the mounting groove is complicated. Therefore, the shroud is preferably formed such that one of the upper side and the lower side of the side U-shaped portion is longer than the other, and the mounting groove is formed on the inner surface of the longer upper side or the lower side.

  The shroud may have a width that fits between adjacent claws of the lower end edge of the bucket body, but has a function of protecting the portion between adjacent claws of the lower end edge of the bucket body from abrasion. Therefore, it is preferable that the shroud has a width that covers most of the claw between adjacent claws of the opening lower end edge of the bucket body.

  As long as the lock plate is fixed to the lower end edge portion of the opening of the bucket body, it may be fixed to either the inner surface or the outer surface of the lower end edge portion of the opening.

  Hereinafter, the present invention will be described in detail based on specific examples shown in the drawings. 1 to 7 show a preferred embodiment of a shroud mounting structure for a digging bucket according to the present invention. In the figure, the bucket body 10 has a box shape with an open front surface, and left and right mounting brackets 12 are arranged parallel to each other at the upper edge portion of the opening 11 of the bucket body 10 and fixed by welding or the like. Two bushes 13 are attached to the bracket 12.

  These mounting brackets 12 are aligned with the tip mounting portions of an operating arm (not shown) such as a hydraulic excavator, and a connecting pin (not shown) is press-fitted into the mounting hole of the tip mounting portion and the bush 13. As a result, the excavation bucket is attached to the operation arm.

  A plurality of adapters 21 are arranged at intervals on the lower end edge of the opening 11 of the bucket body 10 and fixed to the bucket body 10 by welding or the like. Claws 20 are fitted into these adapters 21, and the claw 20 is attached to the lower end edge of the opening 11 of the bucket body 10 in a replaceable manner by inserting a mounting pin 22 into both mounting holes.

  Further, a shroud 30 is attached between adjacent claws 20 at the lower end edge portion of the opening 11 of the bucket body 10. As shown in FIGS. 2 and 3, the shroud 30 has a side shape in which the upper side portion 31 of the substantially U-shaped side surface is longer than the lower side portion 32.

  A mounting groove 33 is formed on the lower surface (inner surface) of the upper side portion 31 of the shroud 30 so as to extend in the longitudinal direction and the rear end thereof is opened to the rear end of the upper side portion 31, and the pin insertion concave groove 34 is attached to the shroud 30. It extends in the lateral width direction so as to cross the concave groove 33 and is formed with both ends open to both side ends of the upper side portion 31.

  On the other hand, a lock plate 40 is fixed to the inner surface of the lower end edge portion of the opening 11 of the bucket body 10 by welding or the like as shown in FIG. The lock plate 40 has a width and thickness that are slidably fitted into the mounting groove 33 of the shroud 30. A pin insertion groove 41 extends in the width direction on the upper surface of the lock plate 40, and both ends of the lock plate 40 have the lock plate 40. It is formed open at both ends.

  Further, a substantially trapezoidal fitting recess 42 is formed on the inner surface of the pin insertion groove 41 of the lock plate 40, and a hard rubber pin urging member (elastic body) 43 is fitted in the fitting recess 42. The pin urging member 43 has three retaining pins 44 which are vertically held and held at the front half exposed in the mounting groove 41.

  The pin insertion concave groove 41 of the lock plate 40 matches the pin insertion concave groove 34 of the shroud 30 to form a pin insertion hole when the shroud 30 is mounted so as to sandwich the lower end edge portion of the opening 11 of the bucket body 10. A stopper pin (stopper member) 50 is inserted into the pin insertion hole.

  In this stopper pin 50, three fitting recesses 51 are formed on the side surface at intervals corresponding to the interval between the retaining pins 44, and raised portions are formed outside the fitting recesses 41 at both ends. When the pin is inserted into the pin insertion hole, the retaining pin 44 is fitted into the fitting recess 51 so as to prevent the stopper pin 50 from coming off from the pin insertion hole.

  When the shroud 30 is attached to the bucket body 10, the mounting groove 33 of the shroud 30 is aligned with the lock plate 40, and in this state, the opening of the bucket body 10 is between the upper side portion 31 and the lower side portion 32. The shroud 30 is pushed so that the lower end edge portion of 11 is sandwiched.

  Then, the lock plate 40 slides relatively in the mounting groove 33 of the shroud 30, and the tip of the lower end edge of the opening 11 of the bucket body 10 extends between the upper side portion 31 and the lower side portion 32 of the shroud 30. When it hits the end portion, the lower end edge portion of the opening 11 of the bucket body 10 is firmly held between the upper side portion 31 and the lower side portion 32 of the shroud 30.

  At the same time, the pin insertion concave groove 34 of the shroud 30 and the pin insertion concave groove 41 of the lock plate 40 are matched to form a pin insertion hole, so that the stopper pin 50 is inserted into the pin insertion hole.

  When the raised portion of the fitting recess 51 on the outer side of the stopper pin 50 reaches just before the outer retaining pin 44, the raised portion of the fitting recess 51 on the outer side of the stopper pin 50 hits the first retaining pin 44. Therefore, when the stopper pin 50 is struck and further pushed in, the protruding portion of the fitting recess 51 outside the stopper pin 50 elastically deforms the pin urging member 43 and resists the urging force. The first retaining pin 44 is moved over, and the first retaining pin 44 is fitted into the first fitting recess 51.

  Further, when the stopper pin 50 is pushed in by hitting or the like, the raised portion of the fitting recess 51 outside the stopper pin 50 elastically deforms the pin urging member 43, and the second retaining member resists the urging force. Over the pin 44, the second retaining pin 44 is fitted into the first fitting recess 51, and the first retaining pin 44 is fitted into the center fitting recess 51.

  Further, when the stopper pin 50 is pushed in, the raised portion of the fitting recess 51 outside the stopper pin 50 elastically deforms the pin urging member 43, and overcomes the third retaining pin 44 against the urging force, The third retaining pin 44 is fitted into the first fitting recess 51, the second retaining pin 44 is fitted into the central fitting recess 51, and the first retaining pin 44 is fitted into the last fitting recess 51. Thus, the stopper pin 50 is prevented from being removed by the three retaining pins 44.

  At this time, the bucket body 10 is sandwiched between the upper side portion 31 and the lower side portion 32 on the front end side of the shroud 30 and is positioned by the stopper pin 50 on the rear end side of the shroud 30. It will be locked in the attachment state to the main body 10.

  In addition, the shroud 30 is locked with the lock plate 40 fitted in the mounting groove 33 so that the shroud 30 does not rattle and unpleasant noise during excavation or rake work. There is no possibility that the shroud will drop and the shroud will fall due to wear due to collision or the like.

  When replacing the shroud 30, the reverse operation is performed, the stopper pin 50 is pulled out to the side to unlock the shroud 30, the shroud 30 is removed from the bucket body 10, and then the new shroud 30 is similar to the above. The stopper pin 50 may be used to prevent the front from coming off.

  If the lock plate 40 does not fit well in the mounting groove 33 of the shroud 30 due to the thickness of the lower end edge portion of the opening 11 of the bucket body 10, a spacer plate is interposed under the lock plate 40. It is preferable to adjust the height of the lock plate 40.

  In addition, in this way, it is not necessary to prepare the shroud 30 and the lock plate 40 for each of different types and sizes of excavation buckets, and the shroud 30 and the lock plate 40 can be used as general-purpose parts.

  8 to 11 show a second embodiment, in which the same reference numerals as those in FIGS. 1 to 7 denote the same or corresponding parts. In this example, a mounting groove 33 is formed in the lower surface (inner surface) of the upper side portion 31 of the shroud 30 so as to extend in the longitudinal direction and the rear end is opened to the rear end of the upper side portion 31, and a rectangular stopper. A fitting hole 35 of the plate (stopper member) 60 is formed so as to communicate with the mounting groove 33 and vertically penetrate.

  On the other hand, a lock plate 40 is fixed to the inner surface of the lower end edge portion of the opening 11 of the bucket body 10 by welding or the like as shown in FIG. The lock plate 40 has a width and thickness so as to be slidably fitted in the mounting groove 33 of the shroud 30, and a step 45 for fitting the stopper plate 60 is formed on the upper surface of the lock plate 40. Two screw holes 46 into which the male screw of the bolt 62 is screwed are formed.

  Further, the stopper plate 60 has a shape that fits into the fitting hole 35 of the shroud 30 and the stepped portion 45 of the lock plate 40, and is fixed to the lock plate 40 by screwing to prevent the shroud 30 from coming forward. It is like that.

  When the shroud 30 is attached to the bucket body 10, the mounting groove 33 of the shroud 30 is aligned with the lock plate 40, and in this state, the opening of the bucket body 10 is between the upper side portion 31 and the lower side portion 32. The shroud 30 is pushed so that the lower end edge portion of 11 is sandwiched.

  Then, the lock plate 40 slides relatively in the mounting groove 33 of the shroud 30, and the tip of the lower end edge of the opening 11 of the bucket body 10 extends between the upper side portion 31 and the lower side portion 32 of the shroud 30. When it hits the end portion, the lower end edge portion of the opening 11 of the bucket body 10 is firmly held between the upper side portion 31 and the lower side portion 32 of the shroud 30.

  At the same time, since the fitting hole 35 of the shroud 30 and the stepped portion 45 of the lock plate 40 are matched, the stopper plate 60 is fitted into the fitting hole 35, and the bolt 62 is inserted from the insertion hole 61 and screwed into the screw hole 46 of the lock plate 40. The stopper plate 60 is fixed to the lock plate 40.

  Then, the bucket body 10 is sandwiched between the upper side portion 31 and the lower side portion 32 on the front end side of the shroud 30, and the front end side of the shroud 30 is prevented from coming off by the stopper plate 60. It will be locked in the attached state to the bucket body 10.

  In addition, the shroud 30 is locked with the lock plate 40 fitted in the mounting groove 33 so that the shroud 30 does not rattle and unpleasant noise during excavation or rake work. There is no possibility that the shroud will drop and the shroud will fall due to wear due to collision or the like.

  When replacing the shroud 30, the reverse operation is performed to remove the stopper plate 60, unlock the shroud 30, remove the shroud 30 from the bucket body 10, and then install a new shroud 30 in the same manner as above. The front plate may be prevented from coming off by the stopper plate 60.

  If the lock plate 40 does not fit well in the mounting groove 33 of the shroud 30 due to the thickness of the lower end edge portion of the opening 11 of the bucket body 10, a spacer plate is interposed under the lock plate 40. It is preferable to adjust the height of the lock plate 40.

It is a schematic perspective view which shows preferable embodiment of the shroud attachment structure of the excavation bucket which concerns on this invention. It is the perspective view which looked at the shroud in the said embodiment from upper direction. It is the perspective view which looked at the shroud in the said embodiment from the downward direction. It is the perspective view which looked at the lock plate in the said embodiment from upper direction. It is a figure which shows the relationship between the shroud and the lock plate in the said embodiment. It is side surface sectional drawing which shows the attachment state of the shroud in the said embodiment. It is a figure which shows the relationship between the locking pin in the said embodiment, and a retaining pin. It is the perspective view which looked at the shroud in 2nd Embodiment from upper direction. It is the perspective view which looked at the shroud in the said embodiment from the downward direction. It is the perspective view which looked at the lock plate in the said embodiment from upper direction. It is a figure which shows the relationship between the shroud and the lock plate in the said embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Bucket body 11 Opening 20 Claw 30 Shroud 31 Upper side part 32 Lower side part 33 Mounting concave groove 34 Pin insertion concave groove 35 Insertion hole 40 Lock plate 41 Pin insertion concave groove 42 Insertion concave part 43 Pin biasing member (elastic body)
44 Stop pin 45 Step 46 Bolt hole 50 Stopper pin (stopper member)
51 Fitting recess 60 Stopper plate (stopper member)
61 Bolt insertion hole 62 Bolt

Claims (5)

In the shroud attachment structure of the excavation bucket in which the shroud is attached between the claws adjacent to the lower end edge of the opening of the bucket body,
While a lock plate is fixed to the bucket body, the shroud has a side shape including a U-shape, and the mounting groove is formed in the shroud so as to extend in the front-rear direction.
The movement of the shroud in the vertical direction is described by the portion of the opening bottom edge of the bucket body being sandwiched by the side U-shaped portion of the shroud, and the lock plate is accommodated in the mounting groove of the shroud The excavation bucket is characterized in that the lateral movement of the shroud is restricted by the contact between the lock plate and the inner surface of the mounting groove, and the shroud is prevented from coming forward with respect to the lock plate by a stopper member. Shroud mounting structure. The lock plate has a pin insertion groove formed in the width direction, and a retaining pin is provided on the inner surface of the pin insertion groove to urge in the protruding direction.
A pin insertion concave groove is formed extending in the lateral width direction on the upper or lower side of the side surface of the shroud.
When the portion of the lower end edge of the opening of the bucket body is sandwiched by the side U-shaped portion of the shroud, the pin insertion concave groove of the shroud and the pin insertion concave groove of the lock plate are matched to form a pin insertion hole. Configured,
By inserting a stopper pin into the pin insertion hole, the shroud is prevented from coming forward, and the stopper pin is inserted into the pin insertion hole by fitting a retaining pin of the lock plate into a fitting recess on a side surface of the stopper pin. The shroud mounting structure for an excavation bucket according to claim 1, wherein the excavation bucket shroud is prevented from coming off from the side. The shroud mounting structure for an excavation bucket according to claim 2, wherein a fitting recess is formed on an inner side surface of the pin insertion groove of the lock plate, and an elastic body holding a retaining pin is fitted in the fitting recess. . A fitting hole for the stopper plate is formed in the upper or lower part of the side U-shape of the shroud so as to penetrate vertically.
A stopper plate is fitted into the fitting hole with the side U-shaped portion of the side surface of the shroud sandwiched between the lower end edge of the opening of the bucket body, and the stopper plate is fixed to the lock plate. The shroud mounting structure for an excavation bucket according to claim 1, wherein the shroud mounting structure is configured to be prevented from coming forward. The shroud mounting structure for an excavation bucket according to claim 4, wherein the lock plate and the stopper plate are fixed by screwing.

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