JP6331131B2 - Blade device with variable width - Google Patents

Description

  The present invention relates to a configuration in which the width of a blade device mounted on a work device can be changed.

As the blade, a configuration is known in which the width of the blade device can be changed. The structure of patent document 1 is proposed as such a working machine.

In the blade device of Patent Document 1, the width in the left-right direction of the blade for earth removal is variable by extending the extension blade to the main blade, and the extension blade is rotated with respect to the main blade via a pivot shaft. It is possible. By rotating the extension blade about the pivot shaft with respect to the extension blade, an extended state in which the width of the main blade is extended and a storage state in the width of the main blade behind the main blade can be realized.

The extension blade inserts a locking tool composed of pins into the locking tool insertion hole in the extension blade side support tool and the extension locking hole or the storage locking hole in the main blade side support tool. Secure with. When the extended state is set, the locking tool is inserted into the extended locking hole, and when the storage mode is set, the locking tool is inserted into the storage locking hole. The extension blade and the main blade are always integrated, and it is not necessary to remove the extension blade when changing the width.

  An operation part constituted by a grip knob is provided above the locking tool. A reverse U-shaped retaining rod is provided on the upper surface of the main blade side support, and a grip knob rotation prevention stopper is provided below the reverse U-shaped to prevent the operation unit from moving left and right. When the locking tool is inserted, the locking tool is prevented from coming off by the grip knob turning prevention stopper and the retaining rod.

JP-A-10-183673

The blade device described in Patent Document 1 has a structure in which a locking tool is inserted into one of the extension locking hole or the storage locking hole to fix the extension blade, but no locking tool is inserted into the other. Mud accumulates easily.

Further, in order to insert the locking tool, the locking tool insertion hole in the extension blade side support tool and the extension locking hole or the storage locking hole in the main blade side support tool are positioned so as to overlap vertically. They must be aligned and the axes should be perfectly aligned.

Further, when pulling out the locking tool, it is necessary for the operation portion to avoid the retaining rod and the grip knob rotation prevention stopper, and it is necessary to perform an operation of rotating in addition to lifting. In this configuration, if mud accumulates and adheres between the retaining rod and the grip knob rotation prevention stopper, it is difficult to pull up the locking tool.

The present invention solves the above-mentioned problem, and even when the hole for inserting the locking device is not provided with a portion where no countermeasure against mud is performed and mud is accumulated and fixed when the locking device (stopper) is pulled out. An object of the present invention is to provide a blade device that can be easily attached and detached.

The present invention makes the width of the earth removal surface variable on the extension in the width direction of the main blade with respect to the main blade having the earth removal surface extending in the width direction of the front portion of the work machine including the lower traveling body. In a blade device equipped with an expansion blade with a variable width of the soil removal surface, a main blade mounting plate provided horizontally on the back surface of the main blade, and provided on the back surface of the expansion blade so as to overlap below the main blade mounting plate An extension blade mounting plate, and a main blade hole is formed in the main blade mounting plate with respect to the expansion blade mounting plate. By extending through-holes so that they overlap each other and forming expansion blade holes, and providing connection pins that pass through these holes, the expansion blades can rotate with respect to the main blade around the connection pins The expansion blade is variable between a state in which the main blade is expanded and a state in which the expansion blade is housed behind the main blade, and a groove extending in the blade width direction is formed above the main blade mounting plate to form a main blade. The extension blade mounting plate is provided with an extension portion that is higher than the bottom of the groove of the main blade mounting plate, and the extension portion of the main blade groove is extended in the expanded state. Even when the expansion blade is rotated and placed in the stowed state, a groove located on the extension of the main blade groove is formed as an extension blade groove, and the main blade groove is in the expanded state and the stowed state. The blade device is characterized by restricting the rotation around the connecting pin by fitting a stopper corresponding to the extended blade groove.

In the blade apparatus, the extension blade is extended in the extended state in which the extension blade is aligned with the main blade to expand the width of the main blade, and in the storage state in which the extension blade is positioned behind the main blade. The expansion blade groove is positioned above, and the rotation of the expansion blade around the connection pin can be restricted by fitting the stopper into the main blade groove and the expansion blade groove.

Since these grooves are in the upper part of the main blade mounting plate and the extending portion, it is possible to easily visually align the grooves necessary to fit the stopper.

During the operation, the stopper is fitted in a shape corresponding to the main blade groove and the extended blade groove, and covers the whole of these grooves, so that mud does not easily accumulate in the groove.

  The main blade groove and the extension blade groove preferably extend to the ends of the main blade attachment plate and the extension blade attachment plate without interruption.

  According to said structure, the said main blade groove | channel and the said expansion blade groove | channel can be covered with one stopper.

It is preferable that a lower plate is provided on the rear surface of the main blade so as to overlap the extension blade attachment plate, and the extension blade attachment plate is sandwiched between the main blade attachment plate and the lower plate.

  By providing the lower plate, a load applied to the expansion blade can be supported.

It is desirable to make a lower plate hole penetrating the lower plate so as to overlap the main blade hole and the extension blade hole.

According to said structure, a connection pin can penetrate the said main blade hole, the said expansion blade hole, and the said lower plate hole, and can stabilize rotation of the said expansion blade.

The main blade hole is preferably formed at the bottom of the main blade groove.

According to said structure, the said connection pin will be located under the said stopper engage | inserted in the said main blade groove | channel, and it can prevent that mud enters into the clearance gap between the said connection pin and the said hole, By fixing the stopper, the connection pin can be prevented from moving upward and coming off.

It is desirable that the connecting pin has a shape having a large-diameter portion having a large diameter at an upper portion of a small-diameter portion having a small diameter, and the diameter of the upper portion of the main blade hole is increased according to the shape.

According to said structure, when the said connection pin is inserted from the top, the said large diameter part will be hooked on the upper part of the said main blade hole, and it can prevent that the said connection pin moves below.

The connecting pin is inserted at a position where the large diameter portion at the upper end does not protrude from the bottom of the main blade groove.

According to the above configuration, interference between the connection pin and the stopper when fitted in the main blade groove is avoided, and processing such as a depression or a hole in the stopper becomes unnecessary.

It is desirable that the expansion blade mounting plate is provided with a gap between the extended portion of the expansion blade mounting plate and the main blade mounting plate in the expanded state and the stored state.

According to the above configuration, by providing the gap portion, it is possible to avoid the extension blade mounting plate and the main blade mounting plate from interfering with each other to prevent the expansion blade from rotating. Can do.

The main blade hole is formed at a position where the distances from both ends in the longitudinal direction of the main blade mounting plate are equal, and the shaft side rotation of the extension portion of the extension blade mounting plate with the connection pin as an axis It is desirable that the diameter be larger than the width in the blade longitudinal direction of the main blade mounting plate.

According to the above configuration, when the gap between the gap portions is constant and the extension blade is rotated with respect to the main blade with the connection pin as an axis, the extension portion of the extension blade mounting plate and the main blade Interference with the blade mounting plate can be avoided.

It is desirable that the stopper has a long portion corresponding to the main blade groove and the extension blade groove, and a short portion sandwiched between the extension portion of the extension blade attachment plate and the gap portion of the main blade attachment plate.

In this configuration, in addition to the longitudinal portions corresponding to the main blade groove and the extension blade groove, by providing a short portion sandwiched between the extended portion of the extension blade attachment plate and the gap portion between the main blade attachment plate, The rotation of the expansion blade is firmly restricted, and mud can be prevented from accumulating in the gap.

The short part of the stopper is preferably thicker than the long part.

This stopper has a shape corresponding to the extended portion of the extension blade mounting plate and the gap portion of the main blade mounting plate by thickening the short portion, and integrates the stopper, the extension blade, and the main blade. Thereby, rotation of an expansion blade can be controlled firmly.

The stopper is preferably composed of two independent parts, a long member corresponding to the long portion and a short member corresponding to the short portion.

The stopper includes the longitudinal portion corresponding to the main blade groove and the expansion blade groove, and the short portion sandwiched between the extension portion of the expansion blade mounting plate and the gap portion between the main blade mounting plate, By making the parts independent of each other, a complicated shape in which the stopper is integrally formed is avoided.

It is desirable that the side surfaces of the main blade mounting plate and the expansion blade mounting plate corresponding to the gaps are inclined so that the upper portions of the main blade mounting plate and the expansion blade mounting plate are thinned.

According to said structure, the accumulation amount of mud can be reduced by making the area of the upper part of the said main blade attachment plate small.

The short member is preferably sandwiched between the extension member of the extension blade mounting plate and the main blade mounting plate and has a side surface corresponding to the inclination.

In this configuration, the gap portion has a wide upper portion due to the inclination, and the short member can be easily attached to the gap portion. Further, the side surface of the short part and the inclined surface may be fixed by mud accumulated between them, but this fixing can be eliminated by rotating the extension blade.

It is preferable that a groove continuous with the main blade groove and the expansion blade groove is formed in the upper part of the short member, and the bottom of the groove is lower than the main blade groove and the expansion blade groove.

In this configuration, the groove provided in the upper part of the short member can avoid interference with the short member when the long member is disposed.

It is desirable that the longitudinal member has a projecting portion at a lower portion, and when the longitudinal member is fitted, the projecting portion is sandwiched by the gap portion above the short member.

In this configuration, when the longitudinal member is fitted, the projecting portion is caught in the gap portion between the extension member of the extension blade mounting plate and the main blade mounting plate at the upper part of the short member, so that the longitudinal member is in the groove direction. It can be prevented from moving.

When the longitudinal member is fitted in a groove, a recess is provided on each side surface of the groove portion that contacts the side surface of the longitudinal member to form a through hole by combining the two recesses, and the stopper that matches the through hole It is desirable to insert a rod.

In this configuration, the longitudinal member can be fixed by inserting a retaining rod into the through hole, and the short member of the stopper and the longitudinal member positioned thereon are grooved by vibration or shock during operation. It is possible to prevent the drop from moving upward.

The retaining rod is preferably provided with a bend at one end when inserted into the through hole.

In this configuration, when the retaining rod is inserted with the bending side facing outward, the retaining rod does not come out inward when it comes into contact with an obstacle.

Furthermore, it is desirable that the longitudinal member of the stopper has a length protruding in the horizontal direction from the groove.

In the above stopper, mud accumulates in the gap between the side surface of the longitudinal member and the groove, and it may not be easy to remove the stopper by lifting it up. The longitudinal member can be removed from the fixed state by lifting the portion protruding from the groove of the member.

  According to the blade device of the present invention, the portion where the stopper is to be attached is reliably covered with the stopper to prevent accumulation of mud, and even when mud accumulates and adheres when the stopper is pulled out, it can be easily attached and detached. it can.

The lower traveling body which concerns on this embodiment is shown. The blade apparatus of this embodiment is shown, (a) is a whole perspective view, (b) is an enlarged view of A part of (a). The left side of the blade device is shown, (a) is a top view, (b) is a BB cross-sectional view, and (c) is a perspective view of a connection pin. (A)-(c) is a figure which shows rotation of the expansion blade of this embodiment. It is a figure which shows the stopper of this embodiment, (a) is a general view, (b) shows the components comprised. It is a figure which shows the fixing means of a stopper, (a) is an expanded state, (b) is an accommodation state.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of a lower traveling body 1 of a work machine according to an embodiment of the present invention.

  The lower traveling body 1 includes a main frame 34 and a pair of crawlers 33a and 33b disposed on both sides of the main frame 34, and has a blade device 2 having a soil removal surface extending in the width direction on the front surface.

  A hydraulic cylinder 35 is installed between the crawlers 33 a and 33 b so as to penetrate the main frame 34, and the width of the crawlers 33 a and 33 b can be expanded and contracted by expansion and contraction of the hydraulic cylinder 35.

  The blade device 2 is pivotally attached to the front surface of the main frame 34 so as to be swingable in the vertical direction, and the rear side of the main blade 10 is supported on the tip of a pair of left and right arms 31a and 31b extending forward. The arms 31a and 31b One end of the cylinder 32 is attached to the bracket 65 between the two so as to be swingable up and down.

  FIG. 2 is for the blade device 2, (a) is a perspective view showing the entire blade device 2, and (b) is an enlarged view of the left side of the blade device 2.

  In FIG. 2A, the left extension blade 11a of the blade device 2 shows a state in which the main blade 10 is expanded, and a state in which the right extension blade 11b is housed behind the main blade 10, and the stoppers 25a and 25b are used. The expansion blades 11 a and 11 b are fixed to the main blade 10.

In FIG. 2B, a main blade mounting plate 12a is horizontally installed at the left end of the rear surface of the main blade 10, and an expansion blade mounting plate 13a provided so as to overlap the main blade mounting plate 12a is an expansion blade 11a. It is installed on the back of the.

  Further, a lower plate 14a is provided on the left side of the arm 31a with respect to the rear surface of the main blade 10 so as to overlap the lower portion of the extension blade attachment plate 13a, and the extension blade attachment plate 13a is sandwiched between the main blade attachment plate 12a and the lower plate 14a. And supporting the load applied to the expansion blade mounting plate 13a.

3A is a top view of the blade device 2, and FIG. 3B is a cross-sectional view taken along the line BB on the left side of the blade device 2. FIG. In the cross-sectional view of FIG. 3 (b), a hole 29a that penetrates the main blade attachment plate 12a, the extension blade attachment plate 13a, and the lower plate 14a in a vertical direction and is continuous is formed, and the connection pin 15a is passed through the hole 29a.

  As shown in FIG. 3C, the connection pin 15a has a large-diameter portion 55a having a large diameter above the small-diameter portion 56a having a small diameter. Since the diameter of the upper portion of the hole 29a is increased in accordance with the shape of the connection pin 15a, the connection pin 15a is prevented from falling down.

  As shown in FIG. 3 (b), the upper end of the connection pin 15a is lower than the lower portion of the stopper 25a to avoid interference between the connection pin 15a and the stopper 25a.

The expansion blade 11a is rotatable with respect to the main blade 10 about the connection pin 15a via the expansion blade mounting plate 13a.

  FIG. 4 is an enlarged view on the left side of the blade device 2 and shows a state when the expansion blade 11a is rotated, (a) is an expanded state, (b) is a state in which the expanded state and the storage state are changed, c) is a storage state.

  A main blade groove 22a extending in the blade width direction through the center of the hole 29a is formed on the upper surface of the main blade mounting plate 12a, and the main blade mounting plate 12a and the main blade mounting plate 12a are rotated on the upper surface of the expansion blade mounting plate 13a. An extending portion 24a is provided on a surface that does not overlap vertically so that the uppermost portion is higher than the bottom of the main blade groove 22a, and an extension extending in the width direction of the extension blade 11a is provided on the upper surface of the extending portion 24a. A blade groove 23a is formed.

The main blade groove 22a and the extension blade groove 23a extend to the ends of the main blade attachment plate 12a and the extension blade attachment plate 13a without interruption.

In FIG. 4, the both ends of the main blade mounting plate 12a in the blade width direction and the both ends of the extending portion 24a in the blade width direction are inclined so that the upper portions of the main blade mounting plate 12a and the extending portion 24a are thinned. Yes, the amount of accumulated mud is reduced by reducing the area of the upper part of the main blade mounting plate 12a and the extended portion 24a.

In addition, in the expanded state of (a) and the retracted state of (c), the expanded blade groove 23a is positioned on either the left or right extension of the main blade groove 22a, and the side surface of the main blade mounting plate 12a The side surfaces of the expansion blade mounting plate 11a facing each other are inclined so as to approach each other downward, and gap portions 27a and 28a having the same shape are formed between these surfaces.

When the extension blade mounting plate 13a is rotated about the connection pin 15a, the extended portion 24a on the extension blade mounting plate 13a rotates outside the main blade mounting plate 12a and does not interfere with the main blade mounting plate 12a.

A recess 46a is formed on the side surface of the main blade groove 22a on the main blade 10 side.

Further, a recess 45a and a recess 47a are respectively formed on the surface of the extension blade groove 23a that faces the side surface on the extension blade 11a side.

The groove 45a is positioned on the extension of the groove 46a in the expanded state, and the groove 47a is positioned on the extension of the groove 46a in the stored state.

  In the expanded state of (a) and the stored state of (c), the rotation of the expansion blade 11a is restricted by fitting the stopper 25a from above the main blade mounting plate 12a and the expansion blade mounting plate 11a.

  5A and 5B are perspective views of the stopper 25a used for maintaining the posture of the expansion blade 11a. FIG. 5A is an overall view of the stopper 25a, and FIG. 5B shows the components constituting the stopper one by one. is there. The stopper 25a is composed of independent parts of the short member 41a and the long member 40a, and a retaining rod 42a is used for fixing the stopper 25a.

As shown in FIG. 5A, in the stopper 25a, the long member 40a fits in the main blade groove 22a and the extended blade groove 23a, and the short member 41a is a gap portion between the main blade mounting plate 12a and the extending portion 24a. The shape fits in 27a and 28a.

  The short member 41a is provided with an inclination such that the lower part thereof becomes thinner in accordance with the shape of the gaps 27a and 28a, and a groove 52a for placing the long member 40a is provided at the upper part. A recess 51a is formed on the side surface of the groove 52a.

  The longitudinal member 40a has a shape corresponding to the main blade groove 22a and the extended blade groove 23a, and has a protruding structure 53a at the bottom. A recess 50a is formed on the side surface of the longitudinal member 40a.

The retaining rod 42a has a shape that fits into the recesses 50a and 51a and is bent at one end.

  FIG. 6 shows a state where the stopper is fitted, (a) is in an expanded state, and (b) is in a stored state.

6A, a stopper 25a is fitted to the left side of the blade device 2 in the expanded state shown in FIG. 4A. The groove 46a and the groove 45a overlap with the recess 51a and the recess 50a, thereby forming one through hole 60a extending in the blade width direction.

6B, a stopper 25a is fitted to the left side of the blade device 2 in the housed state shown in FIG. 4C. The groove 46a and the groove 47a overlap with the recess 51a and the recess 50a, thereby forming one through hole 61a extending in the blade width direction.

The retaining rod 42a has a shape that matches the through hole 60a and the through hole 61a, and is inserted in such a direction that the bending is on the outside.

Next, the function and effect of this embodiment will be described.

  As shown in FIG. 1, when the crawler 33a is expanded, the width of the blade device 2 is expanded to the left accordingly.

  In order to expand the width of the blade device 2, the expansion blade 11a is rotated around the connection pin 15a with the stopper 25a removed as shown in FIG. 4, and the main device as shown in FIG. Move to a position adjacent to the blade 10.

  As shown in FIG. 6A, the main blade groove 22a and the main blade groove 22a are controlled in order to restrict the rotation of the expansion blade 11a around the connection pin 15a with the expansion blade 11a moved to a position adjacent to the main blade 10. The stopper 25a is fitted over the extended blade groove 23a.

  First, the short member 41a is fitted into the gap 27a between the main blade mounting plate 12a and the expansion blade mounting plate 13a. The gap 27a shown in FIG. 4 (a) is inclined on the surface in contact with the blade mounting plate 12a and the expansion blade mounting plate 13a and has a wide upper portion, so that the short member 41a can be easily mounted.

Subsequently, the longitudinal member 40a is fitted over the main blade groove 22a and the extended blade groove 23a. As shown in FIG. 5, there is a protruding structure 53a below the longitudinal member 40a, and the protruding structure 53a is positioned between the main blade mounting plate 12a and the expansion blade mounting plate 13a because the protruding structure 53a is positioned in the gap 27a. Thus, movement along the main blade groove 22a and the extended blade groove 23a can be restricted.

  Further, as shown in FIGS. 4 (a) and 6 (a), there is a recess 50a on one of the side surfaces of the longitudinal member 40a. The recess 50a, the main blade groove 22a, and the extended blade groove 23a are provided on the side surfaces. The longitudinal member 40a is fitted in the direction in which the recesses 45a and 46a coincide with each other, and the recesses 50a and 45a and 46a are combined to form one through hole 60a.

  With the short member 41a and the long member 40a mounted, the retaining rod 42a is inserted into the through hole 60a. The retaining rod 42a has a structure that is difficult to come off due to friction with the through hole 60a. In addition, there is a bend at one end of the retaining rod 42a, and the bending is directed outward to restrict the retaining rod 42a from coming inward when it contacts an external obstacle. The longitudinal portion 40a and the short portion 41a are fixed by the retaining rod 42a, and the short portion 41a of the stopper and the longitudinal portion located thereon move upward from the groove and drop off due to vibration and shock during work. Can be prevented.

  As described above, in the expanded state in which the expansion blade 11a is moved to a position adjacent to the main blade 10, the vertical and longitudinal loads on the expansion blade 11a can be received by the stopper 25a.

  Further, as shown in FIG. 1, when the width of the crawler 33b is reduced, the right side width of the blade device 2 is reduced.

  In order to reduce the width of the blade device 2, with the stopper 25a removed as shown in FIG. 4, the expansion blade 11a is rotated about the connection pin 15a as shown in FIG. 10 is moved to a position stored behind.

  In order to restrict the rotation of the expansion blade 11a about the connection pin 15a as the expansion blade 11a is moved to the position where the expansion blade 11a is housed behind the main blade 10, as shown in FIG. The stopper 25a is fitted over the groove 22a and the extended blade groove 23a.

  The short member 41a is fitted into the gap 28a between the main blade mounting plate 12a and the expansion blade mounting plate 13a. The gap 28a shown in FIG. 4 (c) is inclined on the surface in contact with the blade mounting plate 12a and the expansion blade mounting plate 13a and has a wide upper portion, so that the short member 41a can be easily mounted.

  Subsequently, the longitudinal member 40a is fitted over the main blade groove 22a and the extended blade groove 23a. As shown in FIG. 5, there is a projecting structure 53a at the center of the lower portion of the longitudinal member 40a, and the projecting structure 53a is positioned between the main blade mounting plate 12a and the expansion blade mounting plate 13a. The movement along the main blade groove 22a and the extended blade groove 23a can be restricted.

  Further, as shown in FIGS. 4C and 6B, one of the side surfaces of the longitudinal member 40a has a recess 50a, and the longitudinal member 40a has side surfaces of the recess 50a, the main blade groove 22a, and the extended blade groove 23a. The recesses 46a and 47a provided in the first and second recesses 46a and 47a are fitted in the same direction, and the recesses 50a and 46a and 47a are combined to form one through hole 61a.

  With the short member 41a and the long member 40a mounted, the retaining rod 42a is inserted into the through hole 61a. The retaining rod 42a has a structure that is difficult to come off due to friction with the through hole 61a. Further, there is a bend at one end of the retaining rod 42a, and the bending portion 42a is directed outward to restrict the retaining rod 42a from coming inward when it contacts an external obstacle. 41a is fixed, and it is possible to prevent the short part 41a of the stopper and the long part located thereon from moving upward from the groove due to vibration or shock during work, and falling off.

  Thus, in the storage state where the expansion blade 11a is moved to the rear of the main blade 10, the rotation of the expansion blade 11a can be restricted by the stopper 25a.

  In the expanded state and the retracted state, the upper groove 52a of the short member 41a is aligned with the main blade groove 22a and the extended blade groove 23a. These grooves are aligned with the main blade mounting plate 12a and the expansion blade mounting plate. Since it exists in the upper part of 13a, it can carry out easily visually.

  At the time of work, since the short member 41a, the main blade groove 22a and the extended blade groove 23a are inserted into the gap portions 27a and 28a, the long member 40a is fitted, so that the gap portions 27a and 28a, the main blade groove 22a and the extension blade groove 23a Mud is hard to accumulate inside.

  The through hole 29a for passing the connection pin 15a is formed at the bottom of the main blade groove 22a. However, when the through hole 29a is positioned below the longitudinal member 40a, mud enters the gap between the connection pin 15a and the through hole 29a. This prevents the connecting pin 15a from moving upward by fixing the longitudinal member 40a.

  When the blade device 2 is moved from the expanded state to the retracted state, or when the blade device 2 is moved from the retracted state to the expanded state, the stopper 25a may be pulled out.

In order to pull out the stopper 25a, the retaining rod 42a is first removed. The retaining rod 42a is bent at one end and can be removed by hitting the opposite side.

  The longitudinal member 40a can be removed upward by removing the retaining rod 42a. When mud accumulates and adheres between the longitudinal member 40a and the main blade main blade groove 22a and the expansion blade groove 23a, the portion protruding from the groove of the longitudinal member 40a is lifted or removed by tapping from below. I can do it.

  Similarly to the longitudinal member 40a, the short member 41a is also removed upward. If mud accumulates and adheres between the main blade mounting plate 12a and the extension blade mounting plate 13a in contact with the short member 41a, the extension blade 11a is rotated while the short member 41a is placed, The sticking can be eliminated.

DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Blade apparatus 10 Main blade 11a Left expansion blade 11b Right expansion blade 12a Left main blade mounting plate 13a Left expansion blade mounting plate 14a Left lower plate 15a Connection pin 22a Left main blade groove 23a Left expansion blade groove 25a Left stopper 40a Long member 41a Short member 42a Stop rod

Claims (16)

For the main blade having a soil removal surface extending in the width direction of the front portion of the work machine having a lower traveling body, an expansion blade that makes the width of the soil removal surface variable is mounted on the extension in the width direction of the main blade. In the blade device
A main blade mounting plate provided horizontally on the back surface of the main blade; and an expansion blade mounting plate provided on the back surface of the expansion blade so as to overlap the main blade mounting plate. Open a through hole in the direction, open a through hole so as to overlap the through hole opened in the main blade mounting plate with respect to the expansion blade mounting plate,
By providing connection pins that pass through these holes, the expansion blade can be rotated with respect to the main blade around the connection pin, the expansion blade expands the main blade, and the main blade The state of being housed in the rear is variable, and a groove extending in the blade width direction is formed in the upper part of the main blade mounting plate, and the expansion blade mounting plate is
An extended portion that is higher than the groove bottom of the main blade mounting plate is provided, and the extended blade is positioned on the extension of the groove formed in the main blade mounting plate in the expanded state with respect to the extended portion. Also in the case of turning and storing, forming a groove located on the extension of the groove formed in the main blade mounting plate,
In the expanded state and the retracted state, the rotation of the connecting pin is restricted by fitting a stopper corresponding to the groove of the main blade mounting plate and the groove of the extended portion of the expansion blade mounting plate. The blade device. 2. The blade device according to claim 1, wherein a groove formed in an upper portion of the main blade attachment plate extends in a blade width direction to the end of the main blade attachment plate through the center of the through hole. The lower blade which overlaps under the expansion blade attachment plate with respect to the back of the main blade is provided, and the expansion blade attachment plate is inserted between the main blade attachment plate and the lower plate. Blade device. The blade device according to claim 3, wherein a hole is formed in the lower plate so as to overlap a hole provided in the main blade mounting plate and the extension blade mounting plate, and the connection pin is passed through these holes. At a position where the upper end of the connection pin does not protrude from the groove bottom of the main blade mounting plate, according to claim 4, characterized in that fixed to the hole of the hole portion of the main blade mounting plate the lower plate Blade device. 6. The blade device according to claim 5, wherein a rotation diameter on the shaft side of an extending portion of the extension blade mounting plate with the connection pin as an axis is larger than a lateral width of the main blade mounting plate. The blade device according to claim 6, wherein the expansion blade mounting plate is provided with a gap portion having the same shape in the expanded state and the retracted state between the extended portion of the expansion blade mounting plate and the main blade mounting plate. . The stopper includes a longitudinal portion corresponding to the groove and the groove extending portions of the extended blade mounting plate of the main blade mounting plate, the extension portion and a gap portion of the main blade attachment plates of the extended blade mounting plate The blade device according to claim 7, wherein the blade device is configured by sandwiched short portions. The blade device according to claim 8, wherein the short portion of the stopper is thicker than the longitudinal portion. The blade device according to claim 9, wherein the stopper includes two independent parts, a long member corresponding to the long portion and a short member corresponding to the short portion. Inclinations are provided on both end faces in the longitudinal direction of the main blade mounting plate and side surfaces on the connection pin side of the expansion blade mounting plate so that the upper portions of the main blade mounting plate and the expansion blade mounting plate are thinned, respectively. The blade device according to claim 10. The blade device according to claim 11, wherein the short member is sandwiched between the extended portion of the extension blade mounting plate and the main blade mounting plate and has a shape corresponding to the inclination. Formed in the upper part of the short member is a groove continuous with the groove of the main blade mounting plate and the groove of the extending portion of the main blade mounting plate, and the groove bottom is formed with the groove of the main blade mounting plate and the groove. The blade device according to claim 12, wherein the blade device is lower than the groove of the extended portion of the extension blade mounting plate. The longitudinal member has a projecting structure at the bottom, and when the longitudinal member is fitted, the projecting structure is located above the short member and in the gap between the extended blade mounting plate and the main blade mounting plate. The blade device according to claim 13, wherein the blade device is sandwiched. When the longitudinal member is fitted, a recess is provided in each side surface of the groove portion that contacts the side surface of the longitudinal member, and the longitudinal member is fixed by inserting a retaining rod into the recess. 14. The blade device according to 14. The blade device according to claim 15, wherein the longitudinal member has a length protruding in a horizontal direction from the groove portion.

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