JP5468031B2 - High post type swinging front support device - Google Patents

Description

  The present invention relates to a high post type swinging front support device that is attached to a swing frame by a hydraulic cylinder so as to be horizontally swingable in a self-propelled working machine.

  A work in which a swing frame is mounted on the lower traveling body, a bracket that is horizontally swung by a hydraulic cylinder is mounted on the swivel frame, and a work front such as an articulated front composed of a boom, an arm, etc. is mounted on the horizontal swing bracket. Since the machine can change the left and right orientation of the articulated front by swinging the horizontal swing bracket horizontally without turning the swing frame, it is useful in terms of improving work efficiency and workability. .

  In a working machine having such a horizontal swing bracket, in order to reach a working place such as a crushing tool, a fork or a bucket attached to the front end of the working front as much as possible, as described in Patent Document 1, There is a high post type swinging front support device in which a vertical extension boom is interposed between a horizontal swinging bracket and a boom to increase the front height.

  In such a conventional high post type oscillating front support device, the horizontal oscillating bracket is generally formed of a casting, and the extension boom is a box-shaped can manufacturing structure formed by welding a steel plate. Since the connection between the horizontal swing bracket and the extension boom is performed by distributing the transmission of force between them, the horizontal swing bracket and the extension boom are not only connected by a pin, but are separated from the connection portion by the pin. The two are connected using links at points.

JP 2006-118151 A

  However, in the structure in which the horizontal swing bracket and the extension boom are connected by the pin and the link as described above, the link receives the weight of the work front and a part of the load at the time of the work. There is a problem that it is necessary to use a thick plate having a large area, and the overall weight is also increased. In addition, since a link is used to connect the horizontal swing bracket and the extension boom, there is a problem that rattling occurs.

  In addition, because the vertical pin that connects the horizontal swing bracket and the extension boom is attached / detached, the extension boom is displaced forward from the vertical pin to secure a space for attaching / detaching the vertical pin at the top of the vertical pin. Installed. For this reason, the attachment position of the work front is deviated forward, and there is a problem that the stability of the entire work machine is deteriorated.

  In view of the above problems, the present invention eliminates rattling in the case of using a link in a high post type swinging front support device that lifts and supports a work front at a high position, and has a small number of parts. It aims at providing what can improve stability.

The high post type swinging front support device according to claim 1 is attached to the front support device mounting portion at the front portion of the revolving frame of the work machine via the vertical pin, and left and right by the swing cylinder around the vertical pin. In a high post type swing type front support device that is swingable and has a work front mounted on the top,
It has a support post that is integrally formed with the box mold,
The support post has a working front mounting portion on the upper portion and a hydraulic cylinder mounting portion for raising and lowering the working front, and a connecting portion connected to the front supporting device mounting portion on the lower back surface,
The connecting portion has a structure in which a vertical pin is inserted from below to connect the support post to the front support device mounting portion so as to be horizontally swingable.
In a state where the support post is connected to the front support device mounting portion, the upper portion of the support post is inclined backward so as to approach the revolving frame side from the lower portion,
The connecting portion includes a bracket plate welded to the left and right of the back surface of the support post, and an upper plate having a pin insertion hole that is welded to the left and right bracket plates and the back surface of the support post and to insert the upper portion of the vertical pin. And a lower plate having a pin insertion hole that is welded to each lower end of the support post and the left and right bracket plates and that inserts a lower portion of the vertical pin,
Rear edges of the left and right bracket plates are welded to both side surfaces of the upper plate, and are located below the horizontal edges and face both sides of the front portion of the front support device mounting portion, respectively. A vertical edge having a reduced rearward projecting width, and an arcuate edge between the horizontal edge and the vertical edge;
A reinforcing plate having a width wider than the thickness of the bracket plate extends from the horizontal edge to the vertical edge through the arc edge, and protrudes from the bracket plate to both sides of the support post, and is welded.

The high post type swinging front support device according to claim 2 is attached to the front support device mounting portion at the front portion of the revolving frame of the work machine via the vertical pin, and left and right by the swing cylinder around the vertical pin. In a high post type swing type front support device that is swingable and has a work front mounted on the top,
It has a support post that is integrally formed with the box mold,
The support post has a working front mounting portion on the upper portion and a hydraulic cylinder mounting portion for raising and lowering the working front, and a connecting portion connected to the front supporting device mounting portion on the lower back surface,
The connecting portion has a structure in which a vertical pin is inserted from below to connect the support post to the front support device mounting portion so as to be horizontally swingable.
In a state where the support post is connected to the front support device mounting portion, the upper portion of the support post is inclined backward so as to approach the revolving frame side from the lower portion,
The connecting portion includes a bracket plate welded to the left and right of the back surface of the support post, and an upper plate having a pin insertion hole that is welded to the left and right bracket plates and the back surface of the support post and to insert the upper portion of the vertical pin. And a lower plate having a pin insertion hole that is welded to each lower end of the support post and the left and right bracket plates and that inserts a lower portion of the vertical pin,
The high post type swing type front support device is respectively attached to front support device mounting portions provided on the left and right of the revolving frame,
In the left and right high post type swinging front support devices, each support post has a structure in which the working front mounting portion and the working front elevation hydraulic cylinder mounting portion provided on the support posts and the connecting portion are common. And
The lower plates of the left and right connecting portions have the same shape and are inverted and attached to each other, and have projecting portions projecting in opposite directions to each other. Has a boss to insert the lower part,
On the side surfaces of the left and right support posts, there are provided bosses for inserting the upper portions of the support cylinders for swinging the support posts, and provided with pin connection plates that are welded by reversing the left and right ones in the same shape. It is characterized by that.

  The invention of claim 1 is a structure in which a support post is integrally formed by a box-shaped can-making structure, and a vertical pin for connecting the support post to the swivel frame is inserted from below the support post. A structure in which the support post is inclined so as to approach the revolving frame side from the lower part to the upper part is realized. Such an integrated structure eliminates rattling when using a conventional link and reduces the number of parts.

  Further, by adopting a series of structures in which the support posts are inclined from the lower part to the upper part, it is possible to realize a structure in which there is no bent part in the middle part of the support posts and stress concentration is avoided. As described above, the weight of the entire front support device can be reduced due to the reduced number of parts and the structure in which the stress concentration in the support post is reduced.

  In addition, by adopting a structure in which the vertical pin is inserted from below, the support post is inclined so as to approach rearward from the lower part to the upper part. It becomes possible to position the mounting portion of the cylinder behind the conventional one. For this reason, it becomes possible to improve the stability of the work implement of the entire work implement including the work front, in combination with the weight reduction of the front support device described above.

In addition, since the left and right bracket plates constituting the connecting portion to the front support device mounting portion are welded with reinforcing plates wider than the plate thickness, even if the radius of curvature of the arc edge of the bracket plate is reduced, the bent portion is applied. It is possible to withstand stress, and it is possible to reduce the rearward projecting width of the left and right bracket plates positioned below the upper plate connecting the upper portions of the vertical pins. For this reason, a structure that can prevent interference between the front part of the front support device mounting part and the left and right bracket plates accompanying horizontal swing of the support post is realized, and a structure in which the horizontal cross-sectional area of the support post is narrow is easily realized. Can do.

According to the invention of claim 2 , since most parts can be used in common even though the mounting positions of the swing hydraulic cylinders of the left and right front support devices are opposite to each other, the production line can be shared. Thus, the manufacturing cost of the front support device can be reduced.

1 is a left side view of a double arm type working machine showing an embodiment of a high post type swinging front support device of the present invention. It is a right view of the working machine of this Embodiment. It is a front view of the working machine of this Embodiment. It is a top view of the working machine of this Embodiment. (A) is a right view which shows the support post which comprises the left front support apparatus of the turning frame of the working machine of this Embodiment, (B) is the front view. (A) is a left side view showing the support post of FIG. 5, (B) is a rear view thereof, (C) is a plan view thereof, and (D) is a bottom view thereof. It is a perspective view which shows the attachment structure of the support post shown to FIG. 5, FIG. It is a left view which shows the attachment structure of the support post shown to FIG. 5, FIG. It is a top view which shows the attachment structure of the support post shown to FIG. 5, FIG. It is AA expanded sectional drawing of FIG. It is BB sectional drawing of FIG. It is CC expanded sectional drawing of FIG.

  FIG. 1 is a left side view of a double arm working machine showing an embodiment of a high post type swinging front support device of the present invention. 2 is a right side view thereof, FIG. 3 is a front view thereof, and FIG. 4 is a plan view thereof. 1 to 4, 1 is a crawler type lower traveling body, and 2 is an upper revolving body installed on the lower traveling body 1 via a revolving device 3. The upper swing body 2 is configured by mounting a power unit 4 including a prime mover, a hydraulic pump, and the like, a cab 5 and a counterweight 6 on a swing frame 2a. Reference numeral 11 denotes an earth discharging plate attached to the center frame of the lower traveling body 1 so as to be raised and lowered.

  As shown in FIG. 4, front support device mounting portions 8A and 8B for mounting work fronts 7A and 7B are provided on the left and right sides of the front portion of the revolving frame 2a. Work fronts 7A and 7B are attached to the front support device mounting portions 8A and 8B via the front support devices 9A and 9B, respectively, so as to be horizontally swingable. 10A and 10B are hydraulic cylinders mounted between the turning frame 2a and the front support devices 9a and 9B in order to swing the front support devices 9A and 9B.

  As shown in FIG. 1, the left working front 7A of this embodiment is attached to the top of a front support device 9A and is lifted by a boom lifting cylinder 12 which is a hydraulic cylinder. The arm 15 is rotatably attached to the tip by an arm turning cylinder 14 made of a hydraulic cylinder, and the work tool turning cylinder 16 made of a hydraulic cylinder and links 17 and 18 are turnably attached to the tip of the arm 15. And crushing tool 19. The crushing tool 19 cuts or crushes objects such as houses and scraps by opening and closing a pair of claws 20 for cutting or crushing by a hydraulic cylinder 21.

  As shown in FIG. 2, the working front 7 </ b> B on the right side of this embodiment includes the boom 13, the arm 15, the cylinders 12, 14, 16, the links 17, 18, and the fork attached to the tip of the arm 15. 22. The fork 22 grips and opens an object by opening and closing a pair of gripping claws 23 by a hydraulic cylinder (not shown). The work fronts 7A and 7B may be configured in the same shape and the same size, and may be configured in different shapes or different sizes. In addition to the illustrated example, other work tools such as breakers and buckets may be attached to the work tools attached to the tips of the respective work fronts 7A and 7B.

  FIGS. 5 and 6 show the left front support device 9A. As shown in FIGS. 5A and 5B and FIGS. 6A and 6B, the front support device 9A is the main body. The support post 25 is a can-making structure that forms a box structure by welding the side plates 25a, the front plate 25b, and the back plate 25c. The left and right bracket plates 27 for attaching the base portion of the boom 13 with the pins 26 (see FIGS. 1 and 3) are welded to the top of the support post 25. Reference numeral 27 a denotes a boss welded to the left and right bracket plates 27 in order to insert the pin 26. Also, left and right bracket plates 29 for attaching the cylinder 12 for raising and lowering the work front 7A by pins 28 (see FIGS. 1 and 3) are welded to the upper part of the front surface of the support post 25. A boss 29a is welded to the left and right bracket plates 29 in order to insert the pin 28.

  Reference numeral 30 denotes a connecting portion for connecting the front support device 9A to the front support device mounting portion 8A. The connecting portion 30 is welded to the left and right bracket plates 31 on the back of the support post 25 and the left and right bracket plates 31 and the back of the support post 25, and the upper portion of the vertical pin 36 (see FIG. 11) is inserted. An upper plate 32 having a pin insertion hole 32a (see FIG. 6C) and a vertical pin insertion hole 33a that is welded to the lower ends of the support post 25 and the left and right bracket plates 31 to insert the lower portion of the vertical pin 36. And a lower plate 33 (see FIG. 6D).

  As shown in FIG. 5A, the angle θ formed by the back plate 25c of the support post 25 and the front plate 25b with respect to the upper plate 32 and the lower plate 33 combined in a horizontal posture with respect to the front support device mounting portion 8A. Makes an acute angle. As a result, as shown in FIG. 1, in the state where the support post 25 is attached to the front support device attachment portion 8A, the upper portion of the support post 25 is inclined toward the revolving frame 2a side, that is, toward the rear side from the lower portion. Configure as follows.

  The rear end edges of the left and right bracket plates 31 constituting the connecting portion 30 are welded to the side portions of the upper plate 32 at a position in the middle of the bracket plate 31 in the vertical direction and higher than the lower surface of the upper plate 32. A horizontal edge 31a, a vertical edge 31b (see FIG. 12) that is formed from the horizontal edge 31a to the lower plate 33 and faces both sides of the front portion of the front support device mounting portion 8A, and the horizontal edge 31a and the vertical edge 31b. And arcuate edges 31c formed at the corners between them. Then, from the horizontal edge 31a through the arc edge 31c to the vertical edge 31b, these edges and the side surface of the upper plate 32 are welded to provide the reinforcing plates 34a and 34b. The reinforcing plates 34a and 34b are wider in the left and right widths than the thickness of the left and right bracket plates 31, and are separated from the vertical pins 36 (see FIG. 7) connecting the front support device mounting portion 8A and the support posts 25, that is, support. It is provided so as to protrude from both sides of the post 25.

  The lower plate 33 has a protruding portion 33b that protrudes to the inside of the work machine, and a boss 33c having a hole for inserting a connecting pin 38 (see FIG. 8) for connecting the hydraulic cylinder 10A to the protruding portion 33b is welded. . A bracket 39 having a boss 39a into which the connecting pin 38 is inserted is welded above the protrusion 33b on the side surface of the support post 25.

  7 to 12 show the attachment structure of the front support device 9A to the front support device attachment portion 8A. FIG. 7 is a perspective view, FIG. 8 is a right side view, FIG. 9 is a plan view, and FIG. AA sectional view, FIG. 11 is a BB sectional view of FIG. 9, and FIG. 12 is a CC sectional view of FIG. As shown in FIGS. 8, 11, and 12, a boss 40 is welded to the tip of the front support device mounting portion 8 </ b> A, and an upper plate 32, a lower plate 33, and left and right bracket plates 31 provided with the boss 40. , 31, and a vertical pin 36 is inserted from below into a pin insertion hole 32 a provided in the upper plate 32 and a pin insertion hole 33 a provided in the lower plate 33.

  In FIG. 10, reference numeral 43 denotes a bolt that prevents the vertical pin 36 from coming off. This bolt 43 is inserted into a bolt insertion hole 32 b provided in the upper plate 32 and a pin insertion hole 36 a provided in the vertical pin 36, and the upper plate It is fixed to the upper plate 32 by being screwed into a screw hole 32 c provided in 32.

  As shown in FIG. 7, the hydraulic cylinder 10A for swinging the front support device 9A has one end connected to a bracket 44 provided on the revolving frame 2a by a pin 45 and the other end connected to a boss 33c provided on the lower plate 33. And attached to the support post 25 by a pin 38 inserted into a boss 39a provided on the bracket 39.

  Although the above description has been given for the left front support device 9A, the right front support device 9B is configured in a target form with the left front support device 9A. In this case, the left and right support posts 25, the bracket plate 31, and the bracket plates 27 and 29 are realized by the same structure and the same structure including the bosses 27a and 29a. The bracket plate 31 and the upper plate 32 are realized by a common member and structure. The lower plate 33 uses a plate material having a common shape, and is welded to the lower surface of the support post 25 with the protruding portion 33b facing the inside of the work machine. Further, the connecting plate welded to the side surface of the support post 25 in order to connect the swing hydraulic cylinder 10B is the same shape as the connecting plate 39, and is welded to the inner side surface (that is, the left side) of the support post 25. And install.

  As described above, the front support devices 9A and 9B according to the present embodiment integrally form the support posts 25 with the box-shaped can-making structure, and also connect the vertical pins 36 that connect the support posts 25 to the revolving frame 2a. By adopting a structure in which the support post 25 is inserted from below, a structure in which the support post 25 is inclined so as to approach the rear (from the turning frame side) from the lower part to the upper part is realized. Such an integrated structure eliminates rattling when using a conventional link and reduces the number of parts.

  Further, by adopting a series of structures in which the support posts 25 are inclined from the lower part to the upper part, it is possible to realize a structure in which there is no bent part in the middle part of the support posts 25 and stress concentration is avoided. As described above, the weight of the entire front support devices 9A and 9B can be reduced and provided at a low cost due to the reduced number of parts and the structure in which the stress concentration in the support post is reduced. It becomes possible.

  In addition, by adopting a structure in which the vertical pin 36 is inserted from below, a structure in which the support post 25 is inclined so as to approach rearward from the lower part to the upper part is realized, so that the bracket plates 27 and 29 on the upper part of the support post 25 are provided. The front mounting portion and the mounting portion of the front lifting hydraulic cylinder can be located rearward of the conventional one. For this reason, in combination with the weight reduction of the front support devices 9A and 9B, it becomes possible to improve the stability of the work machine of the entire work machine including the work fronts 7A and 7B.

  In the present embodiment, since the reinforcing plates 34a and 34b are welded across the horizontal edge 31a, the arc-shaped edge 31c, and the vertical edge 31b of the left and right bracket plates 31 constituting the connecting portion 30, the radius of curvature of the arc-shaped edge 31c is set. Even if it is made smaller, it becomes possible to withstand the stress applied to the arc-shaped edge 31c, and the rearward protruding width of the vertical edges 31b of the left and right bracket plates 31 located below the upper plate 32 connecting the upper portions of the vertical pins 36 is increased. It can be made smaller. For this reason, as shown in FIG. 12, when the support post 25 swings as indicated by an arrow R, a structure that can prevent interference between the front support device mounting portion 8A and the left and right bracket plates 31 is realized. For this reason, it is not necessary to widen the space between the left and right bracket plates 31, 31 of the support post 25, and it is possible to easily realize a small-sized one having a narrow horizontal cross-sectional area of the support post 25.

  Further, in the present embodiment, the working machine is a double-armed working machine, and the work front mounting portion is composed of the support posts 25 of the left and right front support devices 9A and 9B, the bracket plate 27 provided on the upper part thereof, and the like. In addition, the working front elevation hydraulic cylinder mounting portion including the bracket plate 29 and the like and the connecting portion 30 have a common structure. In addition, the lower plate 33 of the connecting portion 30 has the same shape on the left and right and is reversed and attached, and the connecting plate 39 having the boss for connecting the pins for connecting the hydraulic cylinders 10A and 10B for swinging also has the same shape on the left and right. Inverted and welded. For this reason, since most of the parts can be used in common for the left and right front support devices 9A and 9B, the production line can be shared, and the manufacturing cost of the front support device can be reduced. In the above-described embodiment, the left and right reinforcing plates 34a and 34b have different widths in the left-right direction. However, these widths may be the same, and in this case, parts can be further shared.

  Although the above description has been given of the case where the working machine is a double-armed working machine, the present invention can also be applied to a working machine configured by attaching one working front to the revolving frame 2a. Further, as the front structure, various structures other than the above embodiment can be used. In addition, when implementing this invention, not only the said embodiment but a various change and addition are possible in the range which does not deviate from the summary of this invention.

1: Lower traveling body, 2: Upper turning body, 2a: Turning frame, 3: Turning device, 4: Power unit, 5: Driver's cab, 6: Counterweight, 7A, 7B: Work front, 8A, 8B: Front support Device mounting portion, 9A, 9B: Front support device, 10A, 10B: Front swing hydraulic cylinder, 12: Boom lifting cylinder, 13: Boom, 14: Arm rotating cylinder, 15: Arm, 16: Working tool rotating Cylinder, 17, 18: Link, 19: Crushing tool, 22: Fork, 25: Support post, 25a: Side plate, 25b: Front plate, 25c: Back plate, 26: Pin, 27: Bracket plate, 27a: Boss, 28 : Pin, 29: Bracket plate, 29a: Boss, 30: Connection part, 31: Bracket plate, 31a: Horizontal edge, 31b: Vertical edge, 31c: Arc edge, 32: Upper plate 32a: Vertical pin insertion hole, 33: Lower plate, 33a: Vertical pin insertion hole, 33b: Projection, 33c: Boss, 34a, 34b: Reinforcement plate, 36: Vertical pin, 38, 45: Connection pin, 39 : Pin connecting plate, 40: Boss, 43: Retaining bolt, 44: Bracket

Claims (2)

By attaching a vertical pin to the front support device mounting part at the front of the swivel frame of the work machine, it is possible to swing left and right by a swing cylinder around the vertical pin, and the work front is mounted on the upper part. In high post type swinging front support device,
It has a support post that is integrally formed with the box mold,
The support post has a working front mounting portion on the upper portion and a hydraulic cylinder mounting portion for raising and lowering the working front, and a connecting portion connected to the front supporting device mounting portion on the lower back surface,
The connecting portion has a structure in which a vertical pin is inserted from below to connect the support post to the front support device mounting portion so as to be horizontally swingable.
In a state where the support post is connected to the front support device mounting portion, the upper portion of the support post is inclined backward so as to approach the revolving frame side from the lower portion,
The connecting portion includes a bracket plate welded to the left and right of the back surface of the support post, and an upper plate having a pin insertion hole that is welded to the left and right bracket plates and the back surface of the support post and to insert the upper portion of the vertical pin. And a lower plate having a pin insertion hole that is welded to each lower end of the support post and the left and right bracket plates and that inserts a lower portion of the vertical pin,
Rear edges of the left and right bracket plates are welded to both side surfaces of the upper plate, and are located below the horizontal edges and face both sides of the front portion of the front support device mounting portion, respectively. A vertical edge having a reduced rearward projecting width, and an arcuate edge between the horizontal edge and the vertical edge;
A high post type characterized in that a reinforcing plate having a width wider than the thickness of the bracket plate is welded so as to protrude from the bracket plate to both sides of the support post from the horizontal edge through the arc edge to the vertical edge. Swing type front support device. By attaching a vertical pin to the front support device mounting part at the front of the swivel frame of the work machine, it is possible to swing left and right by a swing cylinder around the vertical pin, and the work front is mounted on the upper part. In high post type swinging front support device,
It has a support post that is integrally formed with the box mold,
The support post has a working front mounting portion on the upper portion and a hydraulic cylinder mounting portion for raising and lowering the working front, and a connecting portion connected to the front supporting device mounting portion on the lower back surface,
The connecting portion has a structure in which a vertical pin is inserted from below to connect the support post to the front support device mounting portion so as to be horizontally swingable.
In a state where the support post is connected to the front support device mounting portion, the upper portion of the support post is inclined backward so as to approach the revolving frame side from the lower portion,
The connecting portion includes a bracket plate welded to the left and right of the back surface of the support post, and an upper plate having a pin insertion hole that is welded to the left and right bracket plates and the back surface of the support post and to insert the upper portion of the vertical pin. And a lower plate having a pin insertion hole that is welded to each lower end of the support post and the left and right bracket plates and that inserts a lower portion of the vertical pin,
The high post type swing type front support device is respectively attached to front support device mounting portions provided on the left and right of the revolving frame,
In the left and right high post type swinging front support devices, each support post has a structure in which the working front mounting portion and the working front elevation hydraulic cylinder mounting portion provided on the support posts and the connecting portion are common. And
The lower plates of the left and right connecting portions have the same shape and are inverted and attached to each other, and have projecting portions projecting in opposite directions to each other. Has a boss to insert the lower part,
On the side surfaces of the left and right support posts, there are provided bosses for inserting the upper portions of the support cylinders for swinging the support posts, and provided with pin connection plates that are welded by reversing the left and right ones in the same shape. A high post type swinging front support device.

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