JP2012046974A - Earth removal device of construction machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earth removal device of construction machinery capable of not only improving workability in joint work of a blade and bracket but also ensuring the strength and dimensional accuracy of the bracket.SOLUTION: A bracket 22 is integrally formed from a left and right stays 23 and 24, and a connection stay 26 to be U-shaped as a whole. The left and right stays 23 and 24 extend in the front-back direction with alienated from each other in the left-right direction. The base ends thereof are pivotably attached to the front end of a truck frame 6. The connection stay 26 is integrally formed with the left and right stays 23 and 24 and connects between the leading ends of the left stay 23 and the right stay 24. A blade 27 is fixed to the leading end side of the bracket 22 by fixing the front face 26C of the connection stay 26, the rear face plate 27B of the blade 27, and a cover plate 27C.

Description

  The present invention relates to a soil removal device for a construction machine that is mounted on a construction machine such as a hydraulic excavator or a wheel loader and is preferably used for soil removal work such as earth and sand.

  In general, a hydraulic excavator as a construction machine has a vehicle body that includes a self-propelled lower traveling body and an upper revolving body that is rotatably mounted on the lower traveling body. A working device for excavating earth and sand is provided on the front side of the upper swing body so as to be able to move up and down, and an earth removing device for removing earth and sand is provided on the lower traveling body. Yes.

  Here, the excavator of the excavator is usually a bracket whose base end side is rotatably attached to the vehicle body of the construction machine, and a blade provided extending in the left and right directions on the front end side of the bracket, A blade cylinder provided between the bracket and the vehicle body is generally configured, and by extending and retracting the blade cylinder, the blade can be turned up and down via the bracket. (For example, refer to Patent Document 1).

  And when performing earth removal work such as earth and sand, for example, by rotating the bracket downward and grounding the blade to the ground, the hydraulic excavator is run to remove the earth and sand stacked on the ground. It is pushed out in the running direction by a blade and discharged. Thereby, the ground of the work site can be smoothed and leveled.

  By the way, at the time of earth removing work using the earth removing device, for example, when either one of the left end side and the right end side of the blade rides on a rock on the ground, it is inclined from the ground to the blade. A load may act, and in such a case, a large torsional moment or bending moment is applied to the bracket.

  Therefore, for example, in the earth removal device disclosed in Patent Document 1, the strength of the bracket is increased by configuring the bracket with three stays (arms) that are separated from each other in the left and right directions and extend in the front and rear directions. We are trying to secure it. In addition, by providing a plurality of reinforcing plates between the tip of the two stays located on the left and right sides of the three stays constituting the bracket and the back of the blade, The strength of the joint between the tip of the bracket and the back of the blade is ensured.

JP 2002-256585 A

  In the prior art described above, a bracket is constituted by three stays, each of which is a separate member, and the tip portions of these three stays are joined to the back surface of the blade by welding. For this reason, there is a problem that in the state where each stay is connected to the blade, the dimensions of each stay and the positional relationship such as the pin insertion hole provided in each stay are easily shifted, and it is troublesome to ensure the dimensional accuracy.

  In addition, in the above-described prior art, the torsional moment applied to the blade and the deformation of the blade are supported by each stay, which is a separate member, so that the width and thickness dimensions of each stay should be able to withstand this. Further, there is a possibility that the outer diameter and the like become large (enlarge).

  Furthermore, since a large number of reinforcing members are provided between the blade and each stay, the number of parts increases, and the joining work between the blade, each stay and each reinforcing member becomes troublesome (the time required for joining work). May be required).

  The present invention has been made in view of the above-described problems of the prior art, and can improve the workability of the joining operation between the blade and the bracket, and further, the construction machine can ensure the strength and dimensional accuracy of the bracket. The purpose is to provide a soil removal device.

  In order to solve the above-described problems, the present invention provides a bracket whose base end side is rotatably attached to a vehicle body of a construction machine, a blade for earth removal work provided on a distal end side of the bracket, and the bracket. The present invention is applied to a soil removal device for a construction machine including a blade cylinder provided between the vehicle body and the vehicle body.

  The feature of the configuration adopted by the invention of claim 1 is that the brackets extend in the front and rear directions while being separated from each other in the left and right directions, and the base end side is rotatably attached to the vehicle body. And a connecting stay that is formed integrally with the left and right stays and connects between the tip portions of the left and right stays. An abutting surface is provided at the facing part, and the back surface of the blade and the abutting surface of the connecting stay are fixed to each other.

  According to a second aspect of the present invention, the abutting surface of the connecting stay and the back surface of the blade are formed as copying surfaces so as to come into surface contact with each other.

  According to a third aspect of the present invention, the left corner where the left stay and the connecting stay intersect and the right corner where the right stay and the connecting stay intersect each other between the left and right stays and the connecting stay. It is in the shape of an arc so as to be smoothly continuous.

  According to a fourth aspect of the present invention, the left stay, the right stay, and the connecting stay are integrally formed using casting means.

  Furthermore, the invention of claim 5 is that the left stay, the right stay and the connecting stay are formed integrally by bending a plate-shaped or rod-shaped material.

  According to the invention of claim 1, since the bracket is formed by integrally forming the left stay, the right stay, and the connecting stay in a U shape, the strength and dimensional accuracy of the bracket can be ensured. .

  That is, since the tip of the left and right stays are connected by connecting stays, the bending moment and torsional moment applied from the blades are dispersed by the left and right stays connected together. Can be supported. For this reason, the intensity | strength of a bracket can be ensured and the reliability of a soil removal apparatus can be improved.

  Further, since the left and right stays are integrally formed in a state of being connected by a connecting stay, for example, the dimensions of each stay and each stay are compared with the prior art in which the left and right stays are formed of separate members. The accuracy of the positional relationship and the like of the pin insertion holes provided at the base end of the can be improved. For this reason, the dimensional accuracy of the bracket can be ensured, and the desired performance of the soil removal apparatus can be easily secured.

  In addition, since the back surface of the blade and the abutting surface of the connecting stay are fixed to each other, the bonding area between the blade and the bracket can be increased. For this reason, even if the reinforcing member used in the prior art is not provided between the blade and the bracket, the bonding strength between the blade and the bracket can be ensured. Thereby, compared with the prior art which provides a reinforcing member, while being able to reduce a number of parts, the workability | operativity of the joining operation | work of a braid | blade and a bracket can be improved.

  According to the invention of claim 2, since the abutting surface of the connecting stay and the back surface of the blade are formed as a copying surface, the abutting surface of the connecting stay and the back surface of the blade can be brought into surface contact. It is possible to further increase the bonding strength.

  Further, according to the invention of claim 3, since the left corner portion where the left stay and the connecting stay intersect and the right corner portion where the right stay and the connecting stay intersect are formed in an arc shape, the left and right corners are formed. The concentration of stress at the corners can be suppressed, and the strength of the connecting portion between the left and right stays and the connecting stay can be ensured. Further, the strength against a torsional moment applied from the blade to the bracket can be increased, and the durability and reliability of the bracket can be ensured.

  According to the invention of claim 4, since the left stay, the right stay and the connecting stay are integrally formed using the casting means, the bracket forming operation can be facilitated and the manufacturing cost can be reduced. can do.

  Furthermore, according to the invention of claim 5, since the left stay, the right stay and the connecting stay are integrally formed by bending, the bracketing process can be simplified and facilitated, and the manufacturing cost can be reduced. This can be further reduced.

It is a front view which shows the hydraulic excavator provided with the earth discharging apparatus by the 1st Embodiment of this invention. It is a top view which shows the lower traveling body and soil removal apparatus in FIG. It is the expanded sectional view seen from the arrow III-III direction in FIG. 2 which shows a lower traveling body and a soil removal apparatus. It is a perspective view of a soil removal apparatus. It is a perspective view which shows a braid | blade and a bracket. It is a disassembled perspective view which shows a braid | blade and a bracket. It is a perspective view similar to FIG. 5 which shows the braid | blade and bracket by the 2nd Embodiment of this invention. It is a perspective view similar to FIG. 5 which shows the braid | blade and bracket by the 3rd Embodiment of this invention.

  Hereinafter, an embodiment of a soil removal device for a construction machine according to the present invention will be described in detail with reference to the accompanying drawings, taking as an example a case where the soil removal device for a hydraulic excavator is applied.

  First, FIG. 1 to FIG. 6 show a first embodiment of the present invention. In the figure, reference numeral 1 denotes a hydraulic excavator as a typical example of a construction machine. A body of the hydraulic excavator 1 includes a self-propelled crawler-type lower traveling body 2 and a swiveling wheel 3 on the lower traveling body 2. The upper revolving unit 4 is mounted so as to be capable of swiveling. A working device 5 is provided on the right side of the front portion of the upper swing body 4 so as to be able to move up and down. The working device 5 performs excavation work of earth and sand.

  Here, the lower traveling body 2 of the excavator 1 has a track frame 6 serving as a base, and as shown in FIGS. 1 and 2, the track frame 6 is a center frame located at the center in the left and right directions. 6A and the left and right side frames 6B disposed on the left and right with the center frame 6A interposed therebetween and extending in the rearward direction, and the center frame 6A and the left and right side frames 6B before being connected, respectively. , And rear legs 6C, 6C.

  A turning wheel 3 is attached to the upper surface side of the center frame 6 </ b> A constituting the track frame 6. The left and right side frames 6B constituting the track frame 6 are provided with driving wheels 7 located on one end side in the front and rear directions and idle wheels 8 located on the other end side. A crawler belt 9 is wound around the idler wheel 8.

  A pair of frame-side support brackets 10 to which a bracket 22 and a blade cylinder 30 to be described later are attached are provided on the front end side of the center frame 6A so as to be spaced apart in the left and right directions while protruding forward. . Here, as shown in FIGS. 3 and 4, each frame-side support bracket 10 includes a pair of support plates 10 </ b> A provided facing the left and right directions, and a base end side of each support plate 10 </ b> A ( It is generally configured by a pair of sandwiching plates 10B that are attached to the concave portion 10A1 provided on the rear end side so as to face upward and downward. As shown in FIGS. 2 and 3, each frame-side support bracket 10 is attached to the front end portion of the center frame 6 </ b> A with the front end portion of the center frame 6 </ b> A being clamped upward and downward by the sandwiching plates 10 </ b> B. Installed.

  Further, a bracket pin insertion hole for pin-connecting the base end portion of the bracket 22 and a cylinder pin insertion hole for pin-connecting the rod side of the blade cylinder 30 are provided at the front end side (front end side) of each support plate 10A. (Both not shown) are spaced apart from each other in the upward and downward directions. And the below-mentioned connection pins 25 and 31 are inserted in these bracket pin insertion holes and cylinder pin insertion holes.

  On the other hand, the upper swing body 4 of the excavator 1 is provided on the track frame 6 (center frame 6A) via the swing wheel 3 as a base, and on the left side of the front portion of the swing frame 11. The cab 12 that defines the driver's cab and the counterweight 13 that is disposed at the rear end of the swivel frame 11 and balances the weight with the work device 5 are roughly configured.

  Next, reference numeral 21 denotes a soil removal apparatus according to the present embodiment. This earth removing device 21 is provided on one side (for example, the front side) of the lower traveling body 2 in the front and rear directions, and for example, earth removing work for removing earth and sand excavated by using the working device 5 and snow removal. The work is performed. Here, the earth discharging device 21 includes a bracket 22, a blade 27, a blade cylinder 30, a cylinder cover 32 and the like which will be described later.

  Reference numeral 22 denotes a bracket whose base end side is rotatably attached to the front end portion of the track frame 6, and the bracket 22 is roughly constituted by left and right stays 23 and 24, which will be described later, and a connecting stay 26. Here, as shown in FIGS. 5 and 6, the bracket 22 is formed in a substantially U shape as a whole by integrally forming the left stay 23, the right stay 24 and the connecting stay 26 using casting means. ing.

  23 and 24 are left and right stays extending in the front and rear directions in a state of being separated from each other in the left and right directions, and the left and right stays 23 and 24 are, as shown in FIGS. The base end side is rotatably attached to a frame side support bracket 10 provided at the front end portion of the track frame 6, and the distal end side projects forward from the front end portions of the left and right crawler belts 9. The left and right stays 23 and 24 are connected to each other by a connecting stay 26 described later, and a blade 27 described later is attached to the connecting stay 26.

  Here, the left and right stays 23 and 24 have a rectangular cross section having upper surfaces 23A and 24A, lower surfaces 23B and 24B, left and right side surfaces 23C and 24C, respectively, as shown in FIGS. It is formed as a rod-like body, and pin insertion holes 23D and 24D are provided on the proximal end side. The left and right stays 23 and 24 are rotatable with respect to the frame side support bracket 10 by connecting pins 25 that are inserted into the pin insertion holes 23D and 24D and the bracket pin insertion holes of the frame side support bracket 10. It is configured to be pin-coupled.

  In addition, the left and right stays 23 and 24 are provided with reinforcing portions 23E and 24E whose upper and lower dimensions are larger than those of the other portions on the distal end side. And the front-end | tip part of each reinforcement part 23E and 24E is connected by these connection parts 23E and 24E by the connection stay 26 with the same height dimension.

  Reference numeral 26 denotes a connecting stay for connecting the tip portions of the left and right stays 23, 24. The connecting stay 26 is formed integrally with the left, right stays 23, 24 using casting means. Here, the connecting stay 26 is formed so as to extend in the left and right directions as a rectangular plate having a top surface 26A, a bottom surface 26B, a front surface 26C, and a rear surface 26D, and the left and right stays 23 are provided at both ends thereof. , 24 reinforcement portions 23E, 24E are connected.

  Further, the left corner portion 26E where the connecting stay 26 and the left stay 23 intersect is formed in an arc shape (corner R shape) so that the left stay 23 and the connecting stay 26 are smoothly connected. Further, the right corner portion 26F where the connecting stay 26 and the right stay 24 intersect is also formed in an arc shape (corner R shape) so that the right stay 24 and the connecting stay 26 are continuously connected.

  In addition, a front surface 26 </ b> C that is a portion facing the back surface (rear plate 27 </ b> B and cover plate 27 </ b> C) of the blade 27 described later is formed as an abutting surface that is fixed to the back surface of the blade 27. More specifically, the front surface 26C as an abutting surface is a copying surface that follows the surface shape of the back surface so as to come into surface contact with the back surface of the blade 27, that is, the rear surface plate 27B and the cover plate 27C of the blade 27. It is formed as a flat surface following the above. The front surface 26C of the connecting stay 26 is brought into surface contact with the rear plate 27B and the cover plate 27C of the blade 27, and the front surface 26C of the connection stay 26 and the rear plate 27B and the cover plate 27C are fixed to each other by welding. ), The blade 27 is attached to the front end side of the bracket 22.

  Reference numeral 27 denotes a blade (soil discharging board) provided on the front end side of the bracket 22, and the blade 27 is disposed in front of the front end portions of the left and right crawler belts 9 as shown in FIGS. 2 and 3. The left and right crawler belts 9 extend in the left and right directions with a width dimension substantially equal to the width dimension (vehicle width). And the blade 27 pushes the earth and sand piled up on the ground in the running direction by running the excavator 1 and discharges it.

  Here, as shown in FIG. 3 and the like, the blade 27 is formed by using a plate body such as a steel plate material, and has a gentle concave curved cross-sectional shape and extends upward and downward, as opposed to the front plate 27A. A rear plate 27B having an L-shaped cross-section and joined to the rear side of the front plate 27A, and located on the upper side of the rear plate 27B and joined to the upper edge of the front plate 27A and the upper surface of the rear plate 27B. The cover plate 27C and a bottom plate 27D, which is positioned on the lower end side of the rear plate 27B and joined to the lower end side of the rear plate 27B and the lower end edge of the front plate 27A, are substantially formed into a substantially U-shape. Yes.

  Further, a cutting edge 27E made of a thick plate extending in the left and right directions is fixed to the front side of the bottom plate 27D so as to protrude obliquely downward. Also, left and right side plates 27F are joined to both left and right ends of the front plate 27A, the rear plate 27B, the cover plate 27C, and the bottom plate 27D. Further, the lower end side of the bottom plate 27D is closed by a closing plate 27G.

  A connection stay 26 of the bracket 22 is fixed to the back surface of the blade 27. That is, the front plate 26C of the connecting stay 26 is in surface contact with the rear plate 27B and the cover plate 27C as the back surface of the blade 27 across the rear plate 27B and the cover plate 27C. In this state of surface contact, the bracket 22 is attached to the back surface of the blade 27 by, for example, welding between the periphery of the connecting stay 26 and the rear plate 27B and the cover plate 27C.

  Reference numeral 28 denotes a cylinder mounting bracket provided at an intermediate portion between the left and right stays 23 and 24, and each cylinder mounting bracket 28 is rotatably attached to a bottom portion side of a blade cylinder 30 described later. Here, each cylinder mounting bracket 28 is constituted by a pair of substantially triangular support plates 28A formed separately from the left and right stays 23 and 24, as shown in FIG. Pin insertion holes 28B through which the connecting pins 29 are inserted are provided at positions corresponding to each other on the upper portion of the plate 28A. Each support plate 28A is fixed to the side surfaces 23C and 24C of the left and right stays 23 and 24, for example, by welding, for example.

  Reference numeral 30 denotes a pair of blade cylinders positioned between the left and right stays 23 and 24 and provided between the track frame 6 and the bracket 22 of the lower traveling body 2. The blade 27 provided on the tip side is rotated upward and downward.

  Here, the bottom side of the blade cylinder 30 is rotatably connected to the cylinder mounting brackets 28 of the left and right stays 23 and 24 via a connection pin 29, and the rod side of the blade cylinder 30 is connected to the track frame 6. The frame side support bracket 10 is rotatably connected via a connecting pin 31.

  Therefore, by extending and contracting the blade cylinder 30, the blade 27 is centered on the connecting pin 25 that connects the base end of the bracket 22 (left and right stays 23 and 24) and the frame side support bracket 10 of the track frame 6. As above, it is configured to rotate upward and downward.

  Reference numeral 32 denotes a pair of cylinder covers that cover the blade cylinders 30 from above, and the cylinder covers 32 protect the blade cylinders 30 by preventing dirt and the like from directly colliding with the blade cylinders 30.

  The earth excavator 21 of the hydraulic excavator 1 according to the present embodiment has the above-described configuration. The hydraulic excavator 1 is self-propelled to the work site by the lower traveling body 2 and then, for example, rotates the upper revolving body 4. While the working device 5 is moved upside down, excavation work such as earth and sand can be performed.

  On the other hand, when the earth and sand excavated and piled up on the ground is discharged, the blade 27 is rotated downward via the bracket 22 by extending the blade cylinder 30, and the cutting edge 27E of the blade 27 is moved to the ground. To ground. By running the excavator 1 in this state, the earth and sand piled up on the ground can be discharged so as to be pushed out in the running direction by the blade 27, and the leveling work at the work site and the earth backfilling work. Etc. can be performed.

  Here, at the time of the above earth removal work, for example, when either one of the left end side and the right end side of the blade 27 rides on a rock on the ground, the oblique direction with respect to the blade 27 from the ground. Thus, a large bending moment or torsional moment is applied to the bracket 27.

  On the other hand, the earth removal device 21 according to the present embodiment is configured by integrally forming the bracket 22 with the left stay 23, the right stay 24, and the connecting stay 26 in a U-shape, and therefore a large bending moment. Even if a torsional moment is applied, the strength of the bracket 22 can be sufficiently secured.

  That is, since the tip portions of the left and right stays 23 and 24 are connected by the connecting stay 26, bending moments and torsional moments applied from the blades 27 are connected to each other and integrated with each other. The stays 23 and 24 can be distributed and supported. For this reason, the intensity | strength of the bracket 22 can be ensured and the reliability of the earth removal apparatus 21 can be improved.

  In addition, since the back surface of the blade 27 and the front surface 26C of the connecting stay 26 are fixed to each other, the joining area between the blade 27 and the bracket 22 can be increased. For this reason, even if the reinforcing member used in the prior art is not provided between the blade 27 and the bracket 22, it is possible to ensure the bonding strength between the blade 27 and the bracket 22. Thereby, compared with the prior art which provides a reinforcement member, while being able to reduce a number of parts, the workability | operativity of the joining operation | work of the braid | blade 27 and the bracket 22 can be improved.

  Further, since the left and right stays 23 and 24 constituting the bracket 22 are integrally formed in a state of being connected by a connecting stay 26, the left and right stays and the like are formed by separate members as compared with the prior art. For example, the accuracy of the dimensions of the stays 23 and 24 and the positional relationship of the pin insertion holes 23D and 24D provided at the base end portions of the stays 23 and 24 can be increased. For this reason, the dimensional accuracy of the bracket 22 can be ensured, and the expected performance of the soil removal apparatus 21 can be easily secured.

  Further, according to the present embodiment, the front surface 26C of the connecting stay 26 and the rear plate 27B and the cover plate 27C, which are the back surfaces of the blade 27, are formed as copying surfaces, so the front surface 26C of the connecting stay 26 and the blade 27 can be brought into surface contact with the back surface (rear plate 27B, cover plate 27C), and the bonding strength can be further increased.

  Further, according to the present embodiment, the left corner 23E where the left stay 23 and the connecting stay 26 intersect and the right corner 26F where the right stay 24 and the connecting stay 26 intersect are formed in an arc shape. The concentration of stress can be suppressed at the left and right corner portions 26E and 26F, and the strength of the connection portion between the left and right stays 23 and 24 and the connection stay 26 can be ensured. Further, the strength against a torsional moment or the like applied from the blade 27 to the bracket 22 can be increased, and the durability and reliability of the bracket 22 can be ensured.

  In particular, in the case of the present embodiment, reinforcing portions 23E and 24E having a height dimension larger than those of the other portions are provided at the distal ends of the left and right stays 23 and 24, and the height dimension of the connecting stay 26 is also set. Since the heights of the reinforcing portions 23E and 24E are equal to each other, the strength against the torsional moment applied from the blade 27 to the bracket 22 can be increased from this surface, and the durability and reliability of the bracket 22 are ensured. be able to.

  Furthermore, according to the present embodiment, since the left stay 23, the right stay 24 and the connecting stay 26 are integrally formed using casting means, the work of forming the bracket 22 can be facilitated and manufactured. Cost can be reduced.

  Next, FIG. 7 shows a second embodiment of the present invention. The feature of this embodiment is that the left and right protrusions are provided at both ends of the connecting stay of the bracket, and the bracket and the blade are fixed using bolts. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, reference numeral 41 denotes a bracket whose base end side is rotatably attached to the front end portion of the track frame 6, and the bracket 41 is roughly constituted by left and right stays 42 and 43, which will be described later, and a connecting stay 44. Yes. Here, the bracket 41 is formed in a substantially U shape as a whole by integrally molding the left stay 42, the right stay 43, and the connecting stay 44 using casting means.

  Reference numerals 42 and 43 denote left and right stays extending forward and rearward in a state of being separated from each other in the left and right directions. The left and right stays 42 and 43 are pins through which the connecting pin 25 is inserted on the proximal end side. Insertion holes 42 </ b> A and 43 </ b> A are provided, and the distal ends are connected by a connecting stay 44 described later. Here, the height dimensions of the left and right stays 42 and 43 are equal throughout the length direction (front and rear directions).

  Reference numeral 44 denotes a connecting stay for connecting the tip portions of the left and right stays 42 and 43, and the connecting stay 44 is formed integrally with the left and right stays 42 and 43 using casting means. Here, the connecting stay 44 is formed as a plate-like body having a square cross section so as to extend in the left and right directions.

  Further, the left corner portion 44A where the connecting stay 44 and the left stay 42 intersect is formed in an arc shape (corner R shape) so that the left stay 42 and the connecting stay 44 are smoothly continuous. Also, the right corner portion 44B where the connecting stay 44 and the right stay 43 intersect is also formed in an arc shape (corner R shape) so that the right stay 42 and the connecting stay 44 are smoothly connected.

  Further, a left protrusion 44D that protrudes to the left of the left stay 42 is provided at the left end of the connection stay 44, and a right protrusion 44E that protrudes to the right of the right stay 43 is provided at the right end of the connection stay 44. Provided. The protruding left corner portion 44F where the left stay 42 and the left protruding portion 44D intersect is formed in an arc shape (corner R shape) so that the left stay 42 and the left protruding portion 44D are smoothly continuous. Has been. Also, the protruding right corner portion 44G where the right stay 43 and the right protruding portion 44E intersect is also formed in an arc shape (corner R shape) so that the right stay 43 and the right protruding portion 44E are smoothly continuous. ing.

  Further, in the connecting stay 44, a front surface 44C as an abutting surface, which is a portion facing the rear surface plate 27B of the blade 27, has a surface shape of the rear surface plate 27B so as to come into surface contact with the rear surface plate 27B of the blade 27. And more specifically, it is formed as a flat surface. The front surface 44C of the connecting stay 44 and the rear plate 27B of the blade 27 are brought into surface contact with each other, and the connecting stay 44 and the blade 27 are fixed (coupled) to each other using a bolt 45 described later, whereby the bracket 41 The blade 27 is attached to the front end side of the.

  Reference numeral 45 denotes a plurality of bolts for attaching the blade 27 to the bracket 41. Each of the bolts 45 is located at two positions of the intermediate portion sandwiched between the left and right stays 42 and 43 of the connecting stay 44 and the left and right positions. The bracket 41 and the blade 27 are fixed at a total of four positions including one position of each of the projecting portions 44D and 44E. Here, each bolt 45 is inserted into, for example, a bolt insertion hole (both not shown) provided in the connecting stay 44 and the rear plate 27B, and faces the inner surface (the front plate 27A) of the rear plate 27B. The blade 27 is attached to the front surface 44C of the connecting stay 44 with the bolt 45 by screwing into a nut (not shown) joined by welding or the like at a position corresponding to the bolt insertion hole on the side surface). Yes.

  The excavator earthmoving device according to the present embodiment uses the bracket 41 as described above to attach the blade 27 to the vehicle body (track frame 6) so as to be able to rotate. There is no particular difference from the embodiment.

  However, according to the present embodiment, the left and right projecting portions 44D and 44E projecting in the left and right directions are provided at both end portions of the connecting stay 44, thereby increasing the overall length of the connecting stay 44. ing. For this reason, the intensity | strength with respect to the torsion moment etc. which are applied to the bracket 41 from the braid | blade 27 can be raised, and durability of the bracket 41 and reliability can be ensured. Further, since the length of the connecting stay 44 can be increased, the number of bolts 45 for fixing (connecting) the connecting stay 44 and the blade 27 can be increased, and the connection strength between the connecting stay 44 and the blade 27 is ensured. can do.

  Next, FIG. 8 shows a third embodiment of the present invention. The feature of this embodiment is that the bracket is formed by bending. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, reference numeral 51 denotes a bracket whose base end side is rotatably attached to the front end portion of the track frame 6, and the bracket 51 is roughly constituted by left and right stays 52 and 53, which will be described later, and a connecting stay 54. Yes. Here, the bracket 51 is integrally formed in a substantially U shape as a whole by bending a rod-shaped material, for example, a metal rectangular hollow cylinder. Thereby, the left stay 52, the right stay 53, and the connection stay 54 are integrally formed with each other.

  52 and 53 are left and right stays extending in the front and rear directions in a state of being separated from each other in the left and right directions. The left and right stays 52 and 53 are provided at the front end portion of the track frame 6 on the base end side. It is attached to the frame-side support bracket 10 so as to be rotatable. Here, mounting brackets 52A and 53A that are separate from the left and right stays 52 and 53 are attached to the base end sides of the left and right stays 52 and 53, respectively. Are provided with pin insertion holes 52B and 53B through which the connecting pin 25 is inserted.

  Reference numeral 54 denotes a connecting stay for connecting the tip portions of the left and right stays 52 and 53. The connecting stay 54 is formed so as to extend in the left and right directions. The connecting portion with the tip side is smoothly continuous as a bent portion.

  In addition, the front surface 54A as an abutting surface, which is a portion of the connecting stay 54 that faces the rear surface plate 27B of the blade 27, has a surface shape of the rear surface plate 27B so as to come into surface contact with the rear surface plate 27B of the blade 27. And more specifically, it is formed as a flat surface. Then, the front surface 54A of the connecting stay 54 and the rear plate 27B of the blade 27 are brought into surface contact, and the connecting stay 54 and the blade 27 are fixed (coupled) to each other by welding, whereby the front end side of the bracket 51 is obtained. The blade 27 is attached to the main body.

  The excavator earthmoving device according to the present embodiment uses the bracket 51 as described above to attach the blade 27 to the vehicle body (track frame 6) so as to be able to rotate. There is no particular difference from the embodiment.

  However, according to the present embodiment, the bracket 51 (the left and right stays 52 and 53 and the connecting stay 54) is integrally formed by bending a single bar-shaped material. The processing steps can be simplified and facilitated, and the manufacturing cost can be further reduced. Moreover, since the bracket 51 is formed of a hollow rectangular tube, the bracket 51 having excellent rigidity can be configured to be lightweight.

  In the first and second embodiments described above, the case where the brackets 22 and 41 are formed in a solid shape using casting means has been described as an example. However, the present invention is not limited to this. For example, the bracket may be formed in a hollow shape using a casting means. Further, the bracket can be reduced in weight by forming the solid shape and then cutting the inside.

  Further, in the above-described third embodiment, the bracket 51 is described as an example in which the bracket 51 is formed into a substantially U shape by bending a hollow rectangular tube. . However, the present invention is not limited to this. For example, a substantially square U-shaped bracket may be formed by bending a solid prismatic body. The bracket may be formed in a substantially U shape by bending a hollow or solid plate-shaped material.

  Further, in each of the above-described embodiments, the front surfaces 26C, 44C, 54A of the connecting stays 26, 44, 54 and the back surfaces of the blades 27 (rear plate 27B, cover plate 27C) are flat surfaces so as to be in surface contact with each other. The case has been described as an example. However, the present invention is not limited to this. For example, any one of the front surface of the connecting stay and the rear surface of the blade is a concave curved surface, and the other surface is a convex curved surface so as to be in surface contact with each other. May be.

  Further, in each embodiment, the crawler type hydraulic excavator 1 has been described as an example of the construction machine. However, the present invention is not limited to this, and other construction machines such as a bulldozer, for example, can perform the earth removal according to the present embodiment. The device 21 can also be applied.

1 Excavator (construction machine)
21 Earth removing device 22, 41, 51 Bracket 23, 42, 52 Left stay 24, 43, 53 Right stay 26, 44, 54 Connection stay 26C, 44C, 54A Front (abutting surface)
26E, 44A Left corner corner 26F, 44B Right corner corner 27 Blade 27B Rear panel (back)
27C Cover plate (back)
30 Blade cylinder

Claims (5)

A bracket whose base end is rotatably attached to the vehicle body of the construction machine, a blade for earth removal work provided on the tip side of the bracket, and a blade cylinder provided between the bracket and the vehicle body; In a soil removal device for a construction machine comprising
The brackets are formed integrally with the left and right stays and the left and right stays that extend forward and rearward in a state of being separated from each other in the left and right directions and whose base end side is rotatably attached to the vehicle body. It is formed in a U shape with a connecting stay that connects the tip of the left and right stays,
The connecting stay is provided with an abutting surface at a portion facing the back surface of the blade,
A soil removal device for a construction machine, wherein the back surface of the blade and the abutting surface of the connecting stay are fixed to each other.   The soil removal device for a construction machine according to claim 1, wherein the abutting surface of the connecting stay and the back surface of the blade are formed as a copying surface so as to come into surface contact with each other.   The left corner where the left stay and the connecting stay intersect and the right corner where the right stay and the connecting stay intersect are arcuate so that the left and right stays and the connecting stay are smoothly connected. The soil removal apparatus for a construction machine according to claim 1 or 2 formed.   The earthing device for a construction machine according to claim 1, 2 or 3, wherein the left stay, the right stay and the connecting stay are integrally formed using a casting means.   The earthing device for a construction machine according to claim 1, 2 or 3, wherein the left stay, the right stay and the connecting stay are integrally formed by bending a plate-like or bar-like material.

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