JP6135627B2 - Excavator attachment piping structure - Google Patents

Description

  The present invention relates to an excavator attachment piping structure in which a hydraulic hose is routed toward a hydraulic cylinder of a work attachment.

  The background art will be described with reference to FIGS. Here, a so-called offset type excavator is taken as an example.

  The excavator has a base machine that is mounted on a crawler-type lower traveling body 1 so that the upper swing body 2 can swing around an axis perpendicular to the ground. The base machine (upper swing body 2) A work attachment 3 is attached to the front part.

  The work attachment 3 includes a boom 5 that can be raised and lowered around a boom foot pin 4, an arm 7 that is attached to the tip of the boom 5 so as to be vertically rotatable around a boom top pin 6, and an arm that is attached to the tip of the arm 7. A work device (usually a bucket, which will be described in this example) 9 is provided around the top pin 8 so as to be pivotable up and down, and various operations such as excavation and loading are performed by the undulation and bending operation of the work attachment 3. Is done.

  In the case of an offset excavator, the boom 5 includes a rear boom 5a attached to the upper swing body 2, and left and right fronts connected to the tip of the rear boom 5a so as to be rotatable around the offset support shaft 10 in the vertical direction. Booms (also referred to as offset booms) 5b and 5b, and upper booms 5c attached to the front ends of the front booms 5b and 5b on both sides so as to be rotatable around the upper boom support shaft 11 in the vertical direction. By the offset operation of the boom 5, the arm 7 and the bucket 9 are moved in parallel to the left and right, and a side ditching operation or the like is performed.

  6 and 7, 12 is a boom raising and lowering cylinder for raising and lowering the boom 5 (rear boom 5a), 13 is an arm cylinder for turning the arm 7 up and down, 14 is a bucket cylinder for turning the bucket 9 up and down, Reference numeral 15 denotes an offset cylinder that rotates the front booms 5b, 5b to the left and right.

  On the other hand, hydraulic pipes H connected to the arms, buckets, and offset cylinders 13, 14, and 15 are routed along the work attachment 3 (see FIG. 6).

  In this case, in an excavator, in particular, an offset type excavator in which the work attachment 3 is offset to the left and right as shown in the figure, so that the possibility of contact with an external obstacle is high. Is desirable.

  Therefore, as shown in FIG. 6, the hydraulic piping H routed on the outer surface of the rear boom 5a is introduced into the work attachment 3 at the connecting portion of the rear boom 5a and the front booms 5b and 5b, and the arm, bucket A configuration is adopted in which both cylinders 13 and 14 are passed (see Patent Document 1).

  FIG. 8 is an enlarged view of a portion A of FIG. 6, that is, the three connecting portions of the front and upper booms 5 b and 5 c and the arm 7, and is a partially cut open view.

  As shown in the figure, the upper boom 5c is provided with a U-shaped connection bracket 16 in a side view for connecting the boom 5c to the tip of the front boom 5b so as to be rotatable around the upper boom support shaft 11, A hose through hole 17 is provided in the front wall of the connection bracket 16.

  The hydraulic piping H passed through the inside of the front boom, that is, the hydraulic hose H1 for the arm cylinder reaching the arm cylinder 13 and the hydraulic hose H2 for the bucket cylinder reaching the bucket cylinder 14 pass through the hose through hole 17 respectively. It is led out in front of the boom.

  Among them, a hydraulic hose for the arm cylinder (hereinafter referred to as “arm cylinder hose”) H1 is connected to the arm cylinder 13 through a U-turn-like folding route that turns back from here, and the hydraulic hose H2 for the bucket cylinder remains as it is. It is passed forward and connected to the bucket cylinder 14.

  6 to 8, reference numeral 18 denotes an arm rear bracket projecting from the upper surface of the base end portion of the arm 7, and the upper boom 5 c sandwiches the arm base end portion including the base end portion of the arm rear bracket 18 from the left and right. It is connected to the arm 7 in a state.

  In FIG. 8, reference numeral 19 denotes a side-section reinforcing member attached to the front wall of the connecting bracket 16.

Utility Model Registration No. 2593640

  As described above, in the piping structure in which the arm cylinder hose H1 is folded in a U-turn shape in a narrow space inside the boom tip, that is, inside the upper boom 5c, the folded portion of the hose H1 bulges outward and deforms when the arm is operated. There is a risk of interference with the above structure, particularly the arm cylinder 13 (the portion surrounded by the broken line in FIG. 8).

  As a countermeasure, bars are attached perpendicularly to the hose H at a plurality of locations along the hose folding route in the upper boom 5c, and the hose H1 is pushed back to the inner peripheral side at a plurality of locations by this rod to face outward. It is conceivable to adopt a structure that prevents the bulge deformation of the material.

  However, with this structure, the hose H1 is locally bent at the pressing portion of the bar when the arm is actuated and a large load is applied, and the hose H1 is damaged and its durability is lowered. Arise.

  Therefore, the present invention can prevent interference between the hose and surrounding structures such as the arm cylinder on the assumption that the arm cylinder hose is folded in a U-turn shape inside the boom tip, and is locally applied to the hose. The present invention provides an excavator attachment piping structure that does not cause adverse effects such as large loads.

As means for solving the above problems, in one aspect of the present invention , a work attachment is attached to the front part of the base machine, and the work attachment includes a boom that can be raised and lowered around a boom foot pin, and a tip of the boom. An arm pivotably attached to the left and right boom top pins, a working device pivotally attached to the tip of the arm about the left and right arm top pins, and the boom, arm, and working device. A hydraulic pipe connected to the arm cylinder and the working device cylinder is routed along the working attachment, and a hydraulic hose for the arm cylinder of the hydraulic piping is provided. Is a U-turn folding loop that folds backward from the boom tip through the inside of the boom. In the attachment piping structure of the shovel which is connected with bets on the arm cylinder, the boom, and freely Riabumu undulations around the boom foot pin, around vertical offset shaft in a lateral direction to the tip of the Riabumu rotation The left and right front booms connected to each other and an upper boom mounted on the front end of each side front boom so as to be pivotable in the left and right directions around the upper boom support shaft. A hose guide that guides the folded portion of the hydraulic hose for the cylinder in an arc shape along the folded route from the inner circumference side is provided at the tip of the boom, and the hydraulic hose is connected to the hose guide in the hose length direction. State that is movable and prevents outward movement on the outer periphery of the turn The hose holding member for holding is provided, the hydraulic hose, through between the sides front boom, while connected to the arm cylinder by the return route folding backwards inside the upper boom out from its distal end forward front boom, In the upper boom, a U-shaped connection bracket for connecting the upper boom to the front boom is provided, and a hose through hole for leading the hydraulic hose forward to the front boom is provided in the connection bracket. In addition, the hose guide is attached and the plate-shaped presser plate arranged in the left-right direction so as to sandwich the hydraulic hose between the hose guide and the length of the hydraulic hose between the hose guide and the presser plate. A spacer that keeps the distance to allow movement in the direction and the presser plate The hose holding member is constituted by a bolt attached to the guide (claim 1).

According to the above configuration, the hydraulic hose (arm cylinder hose) connected to the arm cylinder is held by the hose guide on the outer circumferential side while being guided by the hose guide from the inner circumferential side to the arc shape along the folding route. since the outer peripheral side of the folded movable hose in the longitudinal direction and configured to hold the immovable state by the member, shovel, particularly Oite the offset type excavator folding the hose in a narrow space of the upper boom, the arm While preventing interference between the cylinder hose and surrounding structures such as the arm cylinder, it is possible to prevent a local heavy load from acting on the hose.

Further, according to the above configuration, since the hose guide is attached to the connection bracket originally provided on the upper boom, the number of parts can be reduced, the structure can be simplified and the cost can be reduced, and the assemblability can be improved.

Furthermore, according to this structure, since the arm cylinder hose is pressed from the outer peripheral side with a sufficient contact area by the plate-shaped presser plate, damage to the hose can be further reduced.

Here, it is desirable that the hose guide and the presser plate are attached to the connecting bracket by a common bolt (claim 5 ).

  In this way, by attaching the hose guide and the presser plate to the connecting bracket by so-called “co-fastening”, further simplification of the structure, cost reduction, and improvement of assembly can be realized.

  In addition, since the hose guide and the presser plate are bolted to the connection bracket instead of being welded, the hose portion passing through the hose holding member is not likely to be worn or damaged by the welded portion.

In addition, it is desirable that the front and rear end portions of the presser plate be bent toward the outer periphery of the folded back (claim 6 ).

  By doing so, it is possible to protect the hose by preventing the so-called “corner hit” where the front and rear end edges of the presser plate hit the arm cylinder hose.

Further, as a means for solving the above problem, in another aspect of the present invention, a work attachment is attached to a front portion of a base machine, and the work attachment includes a boom that can be raised and lowered around a boom foot pin, and the boom. An arm pivotably attached to the tip of the left and right boom top pins, a working device pivotally attached to the tip of the arm about the left and right arm top pins, and the boom, arm, A boom, an arm and a working device cylinder for operating the working device are provided, and the hydraulic piping connected to the arm cylinder and the working device cylinder is routed along the working attachment. The hydraulic hose passes through the inside of the boom and is folded in a U-turn shape that folds backward from the tip of the boom. In the attachment piping structure of the excavator that is connected to the arm cylinder at the root, a hose guide that guides the folded portion of the hydraulic hose for the arm cylinder in an arc shape along the folded route from the inner peripheral side is provided at the tip of the boom. The hose guide is provided with a hose holding member that can move the hydraulic hose in the hose length direction and holds the hose holding member in a state of preventing outward movement on the outer periphery side of the folded back. while providing the end on the side closer to the arm cylinder in the hose guide, Ru an auxiliary hose holder for holding the hydraulic hoses at the opposite end of the hose guide (claim 2).

  According to this configuration, since the arm cylinder hose is held by the hose guide at both ends opposite to the arm cylinder side, the interference prevention effect between the hose and the surrounding structure becomes more reliable.

  In this case, the auxiliary hose holder may be configured to permit or prevent movement of the hose in the length direction. If the structure which prevents the movement in a length direction is taken, when taking the structure of Claim 2 which attaches a hose guide to a connection bracket, there is no possibility that a hose may interfere with the edge part of a hose through-hole or a front boom.

  According to the present invention, on the premise of a pipe configuration in which the arm cylinder hose is folded into a U-turn shape inside the tip of the boom, it is possible to prevent interference between the hose and peripheral structures such as the arm cylinder and the like. There are no negative effects such as large loads.

It is a partial cross section side view of the boom tip part showing the piping structure concerning the embodiment of the present invention. It is the figure which expanded a part of FIG. It is FIG. 2 equivalent view for demonstrating the attachment structure of the hose guide and hose holding member in embodiment. FIG. It is a perspective view of an attachment state similarly. It is a schematic side view of the offset type excavator which is an example to which the present invention is applied. It is a perspective view of the work attachment of the shovel. It is a figure of the state which expanded the A section in FIG. 6, and cut open part.

  The embodiment is applied to an offset excavator.

  In the following embodiments, the basic configuration related to the excavator and its attachment piping is the same as the known technology shown in FIGS. 6 to 8, and the common parts are denoted by the same reference numerals as in FIGS. A description will be given with reference to the drawings.

  FIG. 1 shows a piping structure in a three-part connecting portion of the front and upper booms 5b and 5c and the arm 7.

  Similar to FIG. 8 of the prior art, the upper boom 5c has a U-shaped connecting bracket 16 for connecting the boom 5c to the tip of the front boom 5b so as to be rotatable around the upper boom support shaft 11. A hose through hole 17 is provided in the front wall of the connection bracket 16.

  The hydraulic piping H passed through the inside of the front boom, that is, the hydraulic hose for the arm cylinder (arm cylinder hose) H1 reaching the arm cylinder 13 and the hydraulic hose H2 for the bucket cylinder reaching the bucket cylinder 14 are hose through holes, respectively. 17 through the front boom.

  Of these, the arm cylinder hose H1 is connected to the arm cylinder 13 through a U-turn-shaped return route that turns back from here, and the bucket cylinder hydraulic hose H2 is passed forward and connected to the bucket cylinder 14 as it is.

  Here, a square-shaped reinforcing member 19 for reinforcing the bracket 16 is attached to the front wall of the connecting bracket 16 in the same manner as in the prior art, and a plate-like hose guide 20 is further forward of the reinforcing member 19. Are attached to the connecting bracket 16 and, as shown in FIGS. 1 and 2, the folded portion of the arm cylinder hose H1 is guided by the hose guide 20 in an arc shape along the folded route from the inner peripheral side.

  More specifically, the hose guide 20 is formed as a bent plate in which the plate material is bent in a plurality of stages along the arc of the hose folded portion so as to be in contact with the hose folded portion at a plurality of locations on the inner periphery. The end portion (upper end portion in the figure) near the arm cylinder 13 is attached to the upper wall of the connection bracket 16 by a pair of bolts 21 in a state where the reinforcing member 19 is covered from the front.

  A hose holding member 22 is attached to the end (upper end) of the hose guide 20 on the arm cylinder side, and an auxiliary hose holder 23 is attached to the opposite end (lower end), respectively, as shown in FIGS. The arm cylinder hose H <b> 1 is held at both ends of the folded back by the hose holding member 22 and the auxiliary hose holder 23 in a state where the arm cylinder hose H <b> 1 is folded back along the hose guide 20.

  As shown in detail in FIG. 2 and subsequent figures, the hose holding member 22 is a plate-like presser disposed in the left-right direction (a direction perpendicular to the hose length direction) so as to sandwich the arm cylinder hose H1 between the hose guide 20 and the hose guide 20. A plate 24 and a pair of cylindrical spacers 25 that maintain a distance for allowing movement of the arm cylinder hose H1 in the length direction between the hose guide 20 and the presser plate 24 are provided, and a bolt 21 for mounting the hose guide is provided. The presser plate 24, the spacer 25, and the hose guide 20 are passed through and screwed into a nut 26 fixed to the upper wall of the connection bracket 16.

  Thereby, the hose holding member 22 is attached to the upper end portion of the hose guide 20 at the same time that the upper end portion of the hose guide 20 is attached to the upper surface wall of the connection bracket 16. That is, the hose guide 20 and the hose holding member 22 are attached by a common bolt 21 in a so-called “co-fastened” state.

  In this case, as shown in FIGS. 4 and 5, the presser plate 24 is bolted as described above at the two left and right positions of the central portion, and the arm cylinder hose H <b> 1 passes through the left and right side portions of the presser plate 24. Has been.

  Further, both front and rear end portions 24a, 24a (reference numerals are attached only to FIG. 3 to FIG. 5) of the presser plate 24 are bent obliquely toward the outer circumferential side.

  On the other hand, the auxiliary hose holder 23 is a pair of left and right female screw members 28, 28 also serving as spacers attached to the holding plate 27 corresponding to the holding plate 24 of the hose holding member 22 and the left and right outer surfaces of the lower end portion of the hose guide 20. The bolts 29 and 29 pass through the holding plate 27 and are screwed into the female screw members 28 and 28.

  Thereby, a gap corresponding to the height of the female screw members 28, 28 is formed between the presser plate 27 and the hose guide 20, and the hose H1 is passed through this gap.

  In this case, the presser plate 27 is bolted at the left and right ends opposite to the presser plate 24 of the hose holding member 22, and the arm cylinder hose H <b> 1 passes through a wide range in the left and right direction including the central portion.

  Note that the presser plate 27 may be bolted at the central portion in the same manner as the presser plate 24. Alternatively, the presser plate 24 may be bolted at both left and right end portions like the holding plate 27.

  Further, the auxiliary hose holder 23 may be configured to allow the hose H1 to move in the length direction similarly to the hose holding member 22, and may be made of rubber or the like in the gap portion as shown by a two-dot chain line in FIG. The hose clamp 30 may be provided to prevent the hose H1 from moving in the length direction.

  By adopting the latter configuration that prevents the movement in the length direction, there is no possibility that the hose H1 interferes with the edge of the hose through-hole 17, the front boom 5b, or the like.

  According to this attachment piping structure, the following effects can be obtained.

  (I) The hose H1 is moved in the length direction by the hose holding member 22 provided on the outer peripheral side while guiding the arm cylinder hose H1 in an arc shape along the return route from the inner peripheral side of the return by the hose guide 20. Since it is configured so that it can be moved and cannot be moved on the outer periphery side of the folding, the excavator, particularly the offset type excavator that folds the hose H1 in a narrow space inside the upper boom mentioned in the embodiment, While preventing interference with surrounding structures such as the arm cylinder 13, it is possible to prevent a local heavy load from acting on the hose H1.

  (II) Since the hose guide 20 is attached to the connection bracket 16 originally provided on the upper boom 5c in the offset excavator, the number of parts can be reduced, the structure can be simplified and the cost can be reduced, and the assemblability can be improved.

  (III) Since the arm cylinder hose H1 is configured to be pressed from the outer peripheral side with a sufficient contact area by the plate-shaped presser plate 24, the hose H1 is compared with a configuration in which the arm cylinder hose H1 is locally brought into contact with the hose H1 with a bar or the like. Can further reduce the damage taken.

  (IV) Since the hose guide 20 and the presser plate 24 are attached (jointly fastened) to the connecting bracket 16 by the common bolts 21 and 21, the structure can be further simplified, the cost can be reduced, and the assembly can be improved. it can.

  (V) Since the hose guide 20 and the presser plate 24 are bolted to the connecting bracket 16 instead of being welded, it is possible to prevent the hose H1 from being worn or damaged by the welded portion.

  (VI) Since the front and rear end portions 24a, 24a of the presser plate 24 are bent to the outer periphery side of the folded back, the so-called "corner hitting" where the front and rear end edges of the presser plate 24 hit the arm cylinder hose H1 is prevented. Can be protected.

  (VII) Auxiliary hose holding tool that holds the hose H1 at the end opposite to the hose guide 20 while providing the hose holding member 22 at the end (upper end) near the arm cylinder 13 in the hose guide 20. 23 is provided, the arm cylinder hose H1 can be held by the hose guide 20 at both ends. For this reason, the effect of preventing interference between the hose and the surrounding structure is further ensured.

Other embodiments
(1) In the above-described embodiment, the hose guide 20 has a shape in which the plate material is bent in a plurality of stages along the arc of the hose folding portion so as to be in contact with the inner circumference of the hose folding at a plurality of locations. The hose guide 20 may be formed in an arc shape corresponding to the arc of the folded portion, and the arm cylinder hose H1 may be guided in a state of being substantially in surface contact with the hose guide 20.

  (2) In the above embodiment, the arm cylinder hose H1 is held at both ends opposite to the arm cylinder side by the hose holding member 22 and the auxiliary hose holder 23, but the hose H1 is held at both ends. You may take the structure hold | maintained at three or more places included.

  Or you may take the structure which hold | maintains the hose H1 only by the hose holding member 22 in one place.

  (3) In the above embodiment, the hose guide 20 is attached to the connection bracket 16. However, the shape of the reinforcing member 19 may be devised and the hose guide 20 attached thereto.

  Or you may provide a hose guide attachment exclusive member different from the connection bracket 16 in an upper boom.

  (4) The present invention is suitable for an offset type excavator that turns the arm cylinder hose H1 in a narrow space in the upper boom as described above, but can also be applied as an attachment piping structure of a non-offset type normal excavator. .

DESCRIPTION OF SYMBOLS 1 Lower traveling body which comprises base machine 2 Same, upper turning body 3 Work attachment 4 Boom foot pin 5 Boom 5a Rear boom 5b Front boom 5c Upper boom 6 Boom top pin 7 Arm 8 Arm top pin 9 Bucket
10 Offset support shaft 11 Upper boom support shaft 13 Arm cylinder 14 Bucket cylinder (working device cylinder)
16 Connecting bracket 17 Hose through hole 20 Hose guide 21 Hose guide mounting bolt 22 Hose holding member 23 Auxiliary hose holder 24 Plates constituting the hose holding member 24a, 24a Front and rear end portions of the same plate 25 Hose holding member constituting Spacer 26 Same as above Nuts 27 Holding plate constituting auxiliary hose holder 28 Same as above, Female thread member 29 Same as above, Bolt for mounting

Claims (6)

A work attachment is attached to the front part of the base machine. This work attachment consists of a boom that can be raised and lowered around the boom foot pin, and an arm that is pivotally mounted around the boom top pin in the left-right direction at the tip of the boom. And a working device attached to the tip of the arm so as to be rotatable around a left and right arm top pin, and the boom, the arm, the boom for operating the working device, the arm, and each cylinder of the working device. And hydraulic piping connected to the working device cylinder is routed along the working attachment, and the hydraulic hose for the arm cylinder of the hydraulic piping passes through the inside of the boom and folds backward from the tip of the boom. Excavator attachment connected to the arm cylinder via a turn-back route In the piping structure,
A rear boom that can be raised and lowered around the boom foot pin, a left and right front boom that is connected to the tip of the rear boom so as to be rotatable about a vertical offset support shaft in the left and right directions, It is configured to be capable of offset operation by an upper boom attached to the tip so as to be pivotable in the left-right direction around the upper boom support shaft in the vertical direction,
A hose guide is provided at the tip of the boom to guide the folded portion of the hydraulic hose for the arm cylinder from the inner circumference side along the folded route, and the hydraulic hose has a hose length. A hose holding member that is movable in the direction and holds in a state of preventing outward movement on the outer periphery side of the turn ,
The hydraulic hose passes between the front booms on both sides and is connected to the arm cylinder through a turn-back route that exits from the front end of the front boom to the front boom and folds backward in the upper boom. A U-shaped connecting bracket for connecting the front hose to the front boom, a hose through hole for leading the hydraulic hose forward to the front boom, and a hose guide attached to the connecting bracket.
A plate-like presser plate arranged in the left-right direction so as to sandwich the hydraulic hose between the hose guide, and a movement of the hydraulic hose in the lengthwise direction between the hose guide and the presser plate An excavator attachment piping structure, wherein the hose holding member is constituted by a spacer for keeping a distance and a bolt for attaching the presser plate to the hose guide . A work attachment is attached to the front part of the base machine. This work attachment consists of a boom that can be raised and lowered around the boom foot pin, and an arm that is pivotally mounted around the boom top pin in the left-right direction at the tip of the boom. And a working device attached to the tip of the arm so as to be rotatable around a left and right arm top pin, and the boom, the arm, the boom for operating the working device, the arm, and each cylinder of the working device. And hydraulic piping connected to the working device cylinder is routed along the working attachment, and the hydraulic hose for the arm cylinder of the hydraulic piping passes through the inside of the boom and folds backward from the tip of the boom. Excavator attachment connected to the arm cylinder via a turn-back route In the piping structure, a hose guide that guides the folded portion of the hydraulic hose for the arm cylinder in an arc shape from the inner peripheral side along the folded route is provided at the tip of the boom, and the hydraulic hose is provided on the hose guide. A hose holding member that can move in the hose length direction and holds the outer peripheral side of the folded back in a state of preventing outward movement,
The hose holding member is provided at an end portion of the hose guide on the side close to the arm cylinder, and an auxiliary hose holder for holding a hydraulic hose at an end portion on the opposite side of the hose guide is provided. Excavator attachment piping structure. A rear boom that can be raised and lowered around the boom foot pin, a left and right front boom that is connected to the tip of the rear boom so as to be rotatable about a vertical offset support shaft in the left and right directions, The hydraulic hose passes between the front booms on both sides, and can be moved from the front end to the front. Connected to the arm cylinder by a turn-back route that returns to the front of the boom and turns the inside of the upper boom backward, and a U-shaped connecting bracket for connecting the upper boom to the front boom in the upper boom. And provide the hydraulic hose to the front bracket. It provided a hose through hole to derive forward arm and the shovel attachment piping structure according to claim 2, characterized in that fitted the hose guide. A plate-like presser plate arranged in the left-right direction so as to sandwich the hydraulic hose between the hose guide, and a movement of the hydraulic hose in the lengthwise direction between the hose guide and the presser plate 4. The excavator attachment piping structure according to claim 3, wherein the hose holding member is constituted by a spacer for maintaining a distance and a bolt for attaching the presser plate to the hose guide. The shovel attachment piping structure according to claim 1 or 4, wherein the hose guide and the presser plate are attached to the hose guide attaching member by a common bolt. The excavator attachment piping structure according to any one of claims 1, 4, and 5, wherein both front and rear end portions of the presser plate are bent toward the outer peripheral side of the folding.