JP5124501B2 - Boom structure of swing work machine - Google Patents

Description

  The present invention relates to a boom structure for a swing work machine that is employed in an ultra-small swing backhoe or the like.

In the conventional technology of the backhoe, as disclosed in FIG. 13 of Patent Document 1, a pair of left and right side plates 87 and 88 are fixed between a pair of upper and lower plates 89 and 90 to form a second boom 33B. A plurality of hydraulic hoses 74 and 75 are arranged along one of the left and right side plates 88 from the proximal end side to the distal end side of the second boom 33B, and the side plates 88 along which the hydraulic hoses 74 and 75 extend are arranged on the upper and lower plates 89 and 90, respectively. A hose arrangement space is formed on the side of the side plate 88 at least on the inner side of the left and right side edges.
A plurality of guide members 92 project outwardly from the left side wall of the second boom 33 </ b> B with a space therebetween, and an arm hydraulic hose 74 and a work tool hydraulic hose 75 are provided between the guide members 92. Are provided, and a cover body 91 is provided so as to cover each guide member 92, arm hydraulic hose 74, and work tool hydraulic hose 75 from the outside, and these guide member 92 and cover body 91 are provided as arm hydraulic hoses. 74 and the work tool hydraulic hose 75 are guided in the longitudinal direction of the second boom 33B while the arm hydraulic hose 74 and the work tool hydraulic hose 75 are guided in the longitudinal direction of the second boom 33B. The hydraulic hose 74 and the work tool hydraulic hose 75 are held on the left side of the second boom 33B so as to be able to sag outward.

  The guide member 92 and the cover body 91 are guide members that allow the hydraulic hoses 74 and 75 to sag.

JP 2007-92378 A

In the above prior art, a plurality of guide members are protruded outwardly on the side wall of the boom at an interval in the vertical direction, making the production troublesome and costly, and the guide member prevents the hydraulic hose from moving up and down. However, it is difficult to prevent the hydraulic hose from being detached unless the guide member is protruded greatly.
It is an object of the present invention to provide a boom structure for a swing work machine that can solve the problems of the prior art.
The present invention provides a swivel work machine in which a guide member is provided with a cover portion that covers the outside of the hydraulic hose and a partition portion that partitions the hose arrangement space up and down so that a structure for guiding the hydraulic hose can be easily and inexpensively manufactured. An object of the present invention is to provide a boom structure.

Specific means for solving the problems in the present invention are as follows.
First, a pair of left and right side plates 4L and 4R are fixed between a pair of upper and lower plates 4U and 4D to form a boom 4, and the boom 4 is extended from the proximal end side to the distal end side along the left and right side plates 4R. A boom of a swivel working machine in which a plurality of hydraulic hoses H are arranged,
The side plate 4R along which the hydraulic hose H extends is arranged inside at least one of the left and right side edges of the upper and lower plates 4U, 4D to form a hose arrangement space Q on the side of the side plate 4R.
The upper and lower ends of the guide member 17 are fixed to at least one side end edge of the upper and lower plates 4U and 4D projecting outward from the side plate 4R along the side plate 4R. ,
The guide member 17 includes a cover portion 17a that covers the outside of the hydraulic hose H, and a partition portion 17b that extends from the cover portion 17a to the side plate 4R side and partitions the hose arrangement space Q up and down. Features.

Second, the guide member 17 is formed of a round bar, and one end thereof is welded to the upper and lower plates 4U and 4D.
Third, the guide member 17 is bent from both ends of the cover portion 17a that covers the outside of the hydraulic hose H, and is formed in a U shape by extending the protruding portion 17c to the side plate 4R side. Two members 17 are used as one set, and the upper protruding portion 17cu of one guide member 17 is fixed to the upper plate 4U, and the lower protruding portion 17cd of the other guide member 17 is fixed to the lower plate 4D. The lower projecting portion 17cd of the other guide member 17 and the upper projecting portion 17cu of the other guide member 17 are spaced apart from each other to form a partitioning portion 17b that partitions the hose placement space Q vertically. .

Fourth, the guide member 17 is bent from one end of a cover portion 17a that covers the outside of the hydraulic hose H, and has a protruding portion 17c extending to the side plate 4R side so as to have an L shape. One set of two members 17 is fixed, the upper end of the cover 17a of one guide member 17 is fixed to the upper plate 4U, and the lower end of the cover 17a of the other guide member 17 is fixed to the lower plate 4D. The protruding portion 17c of the guide member 17 and the protruding portion 17c of the other guide member 17 are arranged with a space therebetween in the vertical direction to form a partitioning portion 17b that partitions the hose arrangement space Q up and down. .
[Action]
The boom structure of the swing working machine having the above-described features has the following effects.

A hose arrangement space Q is formed on the side of one of the left and right side plates 4R of the boom 4 in which a pair of left and right side plates 4L and 4R are fixed between the pair of upper and lower plates 4U and 4D. A hydraulic hose H is arranged, and a guide member 17 fixed to at least one side edge of the upper and lower plates 4U, 4D projecting outward from the side plate 4R has a longitudinal intermediate portion of the hydraulic hose H at the side plate. Guide to follow 4R.
The guide member 17 has a cover portion 17a and a partition portion 17b. The cover portion 17a covers the outside of the hydraulic hose H. The partition portion 17b partitions the hose arrangement space Q up and down. Prevents slack behavior such as up / down and left / right shaking, and reduces the contact between the hydraulic hoses H.

The guide member 17 is formed of a round bar material that does not easily damage the hydraulic hose H. One end of the guide member 17 is welded to the upper and lower plates 4U and 4D, and even if the boom 4 is bent by bending, twisting, or the like, the guide member 17 The occurrence of stress concentration in the member 17 is avoided.
When the guide member 17 is bent from both ends of the cover portion 17a that is long in the vertical direction and covers the outside of the hydraulic hose H, and the protrusion portion 17c is extended to the side plate 4R side to form a U-shape, the protrusion portion It becomes easy to fix to the upper and lower plates 4U and 4D via 17c, and it becomes easy to form the partition part 17b which partitions the hose arrangement space Q up and down, and the cover part 17a can also be easily formed.

  When the guide member 17 is bent from one end of the cover portion 17a that is long in the vertical direction and covers the outside of the hydraulic hose H, and the protrusion portion 17c is extended to the side plate 4R side to form an L shape, the protrusion portion It becomes easy to fix to the upper and lower plates 4U and 4D via 17c, and it becomes easy to form the partition part 17b which partitions the hose arrangement space Q up and down, and the cover part 17a can also be easily formed.

  According to the present invention, the structure for guiding the hydraulic hose can be manufactured easily and inexpensively by providing the guide member with the cover portion that covers the outside of the hydraulic hose and the partition portion that partitions the hose arrangement space vertically.

It is a side view of the principal part which shows 1st Embodiment of this invention. It is a top view which shows the boom structure of a backhoe. It is a perspective view of a 2nd boom. It is a top view of the 2nd boom. The hydraulic hose at the tip of the first boom is a perspective view showing the arrangement. It is the XX sectional view taken on the line of FIG. It is sectional drawing of the principal part which shows 2nd Embodiment. It is sectional drawing of the principal part which shows 3rd Embodiment. It is sectional drawing of the principal part which shows 4th Embodiment. It is sectional drawing of the principal part which shows 5th Embodiment. It is a right view of a very small turning type backhoe.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
2, 5, and 11, reference numeral 1 denotes an ultra-small swivel type backhoe. The backhoe 1 has a swivel base 22 mounted on a crawler type traveling device 21 via a swivel shaft. Are equipped with a work device 23, an engine, a driver's seat 24, a driver's seat protection device 25, a control device 26, and the like.
The working device 23 pivotally supports a base portion of the first boom 2 and a base portion of a boom cylinder 27 for raising and lowering the first boom 2 to the side of the driver seat 24 on the swivel base 22. The second boom 4 is pivotally supported at the tip of the second boom 4 via the first longitudinal axis 3, and the third boom 6 is pivotally supported at the tip of the second boom 4 via the second longitudinal axis 5. An arm 29 is pivotally supported via a horizontal axis 28, and a work tool 30 such as a bucket is provided at the tip of the arm 29.

Then, an offset link 7 is provided between the first boom 2 and the third boom 6, and an offset cylinder 8 is provided between the first boom 2 and the second boom 4 on the left and right sides of the second boom 4, An arm cylinder 31 is provided between the third boom 6 and the arm 29, and a work tool cylinder 32 is provided between the arm 29 and the work tool 30.
Both the offset link 7 and the offset cylinder 8 are disposed on the left and right sides of the second boom 4, and the third boom 6 is translated from side to side about the first boom 2 by the expansion and contraction operation of the offset cylinder 8. .

Three sets of six hydraulic hoses (piping including a rubber hose and a metal pipe) for supplying and discharging hydraulic oil to each of the cylinders 8, 31, 32 are connected to the first boom 2 from the control valve mounted on the swivel base 22. Is extended to the boom tip along the upper wall of the first boom 2 and is inserted into the first boom 2 at the boom tip.
Two of the six hydraulic hoses 9 are extended to the offset cylinder 8 through one side (left side) around the first vertical axis 3. The four hydraulic hoses H1 and H2 pass along the right side surface of the second boom 4 through the other side (right side) of the first vertical axis 3 and then enter the inside of the third boom 6 before the two The hydraulic hose H 1 extends to the arm cylinder 31, and the other two hydraulic hoses H 2 extend to the work tool cylinder 32.

The first boom 2 is formed in the shape of a side view, and is formed in a cylindrical shape by connecting the left and right side walls 2b with the upper wall 2c and the lower wall 2d, and supports the first vertical axis 3 at the tip of the boom. A bearing portion 12 is formed, and a support portion 13 that connects the end portion of the offset link 7 and the end portion of the offset cylinder 8 is provided on the offset cylinder 8 arrangement side (one side surface, left surface) at the tip of the boom.
The tip of the first boom 2 has a bifurcated shape so that the bearing portion 12 sandwiches the base portion of the second boom 4 in the vertical direction, and the space between the vertical bearing portions 12 is perpendicular to the first vertical axis 3. The opening 14 has penetrated.

The opening 14 is formed by the left and right side walls 2b, the upper wall 2c, and the lower wall 2d at the tip of the first boom 2. The opening 14 is opposed to the base of the second boom 4, and the base of the second boom 4 and the piston. The hydraulic hose 9, H 1, H 2 is inserted through the opening 14.
The upper wall 2c of the first boom 2 is connected to the upper part of the left and right side walls 2b in the middle of the boom longitudinal direction, and is connected to the middle of the left and right side walls 2b in the vertical direction of the boom tip. The opening 14 is open, and the six hydraulic hoses 9, H1, H2 are arranged along the upper surface 2a, and are fixed to the upper wall 2c by the fixture 10.

A cover member 15 is provided between the bearing portion 12 at the tip of the first boom 2 and the fixture 10, and communicates with the opening portion 14 between the left and right side walls 2b and between the cover member 15 and the upper surface 2a. In the meantime, there are six hydraulic hoses 9, H1, H2, in particular, a slack space S in which the hydraulic hoses 9 can be loosened.
The second boom 4 is disposed between the bifurcated bearing portion 12 of the first boom 2 on the base side, the first vertical axis 3 is penetrated through both, and the bifurcated bearing portion 6 a of the base portion of the third boom 6 on the distal end side. It arrange | positions between and the 2nd vertical axis | shaft 5 has penetrated both.

A bracket portion 36 that connects the end of the offset cylinder 8 projects from one side surface (left surface) of the second boom 4 in the longitudinal direction. The offset cylinder 8 has a piston rod 8a tip connected to the support portion 13 of the first boom 2 via a pin P1, and a cylinder tube 8b base end connected to a bracket portion 36 of the second boom 4 via a pin P2. .
One end of the offset link 7 is also pivotally connected to the pin P1 of the support portion 13, and the other end of the offset link 7 is connected to the bracket portion 40 protruding from the side surface of the third boom 6 on the offset cylinder 8 side. Are connected through.

The offset link 7 is substantially parallel to the second boom 4, and both constitute a four-joint link mechanism in which the first longitudinal axis 3, the second longitudinal axis 5 and the pins P <b> 1 and P <b> 2 have four joints.
The hydraulic hose 9 is connected to a hydraulic hose connector 38 provided on the cylinder tube 8b of the offset cylinder 8, and when viewed from the offset cylinder 8 side, the hydraulic hose 9 includes the first vertical axis 3 and the tip of the piston rod 8a. Between the other four hydraulic hoses H1 and H2 by the fixture 10 on the upper surface 2a. As shown in FIG. 2, it is arranged on the side of 8 and can swell to the side opposite to the offset cylinder 8 in the slack space S.

The hydraulic hose connector 38 has an elbow shape and generally directs the hose connected thereto in a direction along the cylinder.
When the offset cylinder 8 is contracted to offset the third boom 6 to the offset cylinder 8 arrangement side (left side), the cylinder tube 8b comes closest to the first vertical axis 3, and the hydraulic hose 9 extends to the slack space S, the first. It reaches the first boom 2 substantially linearly without going around the outer periphery of the vertical axis 3. In the first boom 2, the hydraulic hose 9 is restrained by the fixture 10, and therefore loosens in the slack space S.

  When the offset cylinder 8 is extended and the third boom 6 is offset to the side opposite to the offset cylinder 8 arrangement side, the cylinder tube 8b is farthest from the first longitudinal axis 3 and extends from the hydraulic hose connector 38 to the slack space S. The distance is increased by the expansion / contraction stroke of the offset cylinder 8, and the hydraulic hose 9 wraps around the outer periphery of the first vertical axis 3 and reaches the first boom 2, but the cylinder tube 8 b is closest to the first vertical axis 3. Therefore, the bending of the hydraulic hose 9 around the first longitudinal axis 3 is larger, and a sharp bend with a small curvature radius and a large bend is avoided.

The second boom 4 swings left and right with respect to the first boom 2 to cause the third boom 6 to be offset. Therefore, the hose length of the hydraulic hose 9 is determined on the basis of the longest path, and when the short path is reached, there is a margin in the hose length so that the hose length is above the first boom 2 or on the left and right sides. There is a possibility of protruding or coming into contact (kinking) with the periphery of the opening 14.
If the tip end of the piston rod 8a of the offset cylinder 8 is pivotally supported by the first boom 2 and the base end of the cylinder tube 8b is pivotally supported by the second boom 4, the hose length becomes the longest path in the right offset posture. There is no margin in length, and there is no contact with the periphery of the opening 14.

At this time, by placing the hydraulic hose 9 on the offset cylinder 8 arrangement side (left side) of the slack space S with the fixture 10, the curvature radius of the curvature of the hydraulic hose 9 becomes larger than that on the right side, and the bending rate is Get smaller.
When the base end of the cylinder tube 8b is pivotally supported by the second boom 4 to the left offset posture (posture shown in FIG. 2), there is a margin in the hose length. At this time, if the slack space S at the tip of the first boom 2 has a box shape formed by the left and right side walls 2b, the upper wall 2c, and the cover member 15 of the first boom 2, even if there is a margin in the hose length. The slack of the hydraulic hose 9 can be sufficiently absorbed and the slack direction can be restricted to prevent the hydraulic hose 9 from protruding from the first boom 2.

Further, when the hydraulic hose 9 is arranged on the offset cylinder 8 arrangement side (left side) of the slack space S by the fixture 10, the slack of the hydraulic hose 9 occurs on the right side in the slack space S, and at that time The direction of the hose connector 38 faces the opening 14, and the hydraulic hose 9 is separated from the left portion of the periphery of the opening 14, thereby avoiding contact.
The backhoe 1 may be equipped with a work tool 30 having a plurality of actuators in addition to or in place of the bucket, and typically has a service hose H3 for a service port, and may include a pilot hose H4 and the like. . As shown in FIG. 1, the service hose H3 and the pilot hose H4 extend from the first boom 2 to the second boom 4 together with the hydraulic hoses H1 and H2 toward the front side.

In the first embodiment shown in FIGS. 1 to 6, the second boom 4 is formed in a square tube shape by fixing a pair of sheet metal left and right side plates 4L, 4R between a pair of sheet metal upper and lower plates 4U, 4D. The end portion of the cast steel base member 4B is fitted and fixed to the base side, and the end portion of the cast steel tip member 4S is inserted and fixed to the tip side.
The base member 4B is formed with a shaft hole penetrating the first longitudinal axis 3, and a mounting boss 19a is integrally projected on the outer surface thereof, and a round bar is bent in a U shape in the vicinity thereof. Both ends of the hose guide 20 are fixed.

A shaft hole penetrating the second longitudinal axis 5 is formed in the tip member 4S, and a mounting boss 19b is integrally projected on the outer surface thereof.
A hose cover 18 is attached to the attachment boss 19a of the base member 4B and the attachment boss 19b of the tip member 4S via screws.
The hose guide 20 guides the hydraulic hoses H1 to H4 side by side in the vicinity of the first vertical axis 3 that is a joint between the first boom 2 and the second boom 4, and moves the hydraulic hoses H1 to H4. By controlling, the outward expansion is suppressed, the hose enters and exits smoothly from the inside of the tip end of the first boom 2, and the contact with the hose cover 18 can also be prevented.

Although the base member 4B and the tip member 4S of the second boom 4 can be formed by welding a cylindrical body and a mounting boss to a sheet metal or formed from a forged product, the base member 4B and the tip member 4S can be manufactured at a lower cost.
The base member 4B is disposed between the bifurcated bearing portions 12 of the first boom 2, the first longitudinal axis 3 is passed through both of them, and the tip member 4S is located between the bifurcated bearing portions 6a of the base portion of the third boom 6. It arrange | positions and the 2nd vertical axis | shaft 5 has penetrated both.
In the sheet metal square tube portion of the second boom 4, the left and right side plates 4L, 4R are arranged on the inner side of the both side edges (at least one of the left and right side edges) of the upper and lower plates 4U, 4D. On the side, a hose arrangement space Q is formed between the upper and lower plates 4U, 4D.

In the embodiment, since the offset cylinder 8 and the offset link 7 are disposed on the left side of the second boom 4, the right side plate 4R is positioned on the inner side of the right end edges of the upper and lower plates 4U and 4D, and the right side plate 4R A hose arrangement space Q is formed on the right side, and hydraulic hoses H1 to H4 are arranged in the hose arrangement space Q along the right side plate 4R. The hose arrangement space Q is covered with a hose cover 18.
A guide member 17 is fixed to at least one side end edge of the upper and lower plates 4U, 4D protruding outward from the side plate 4R so as to cross the hose arrangement space Q. The midway portion in the longitudinal direction of H1 and H2 is aligned with the side plate 4R to restrict variation.

The guide member 17 is formed by bending one or a plurality of round bars into a U-shape or an L-shape, respectively, and one end thereof is fixed to the upper plate 4U (or the lower plate 4D) by welding. And a cover 17a that covers the outside of the hydraulic hoses H1 and H2, and a partition 17b that extends from the cover 17a toward the side plate 4R and separates the hose arrangement space Q up and down.
The guide member 17A of the first embodiment bends two round bars into a U-shape to form a cover portion 17a and projecting portions 17c at both ends thereof, and an upper projecting portion 17cu on the upper guide member 17A. Is fixed to the upper plate 4U, the lower protruding portion 17cd is opposed to the right plate 4R, the lower protruding portion 17cd of the lower guide member 17A is fixed to the lower plate 4D, and the upper protruding portion 17cu is fixed to the right plate 4R. They are facing each other.

The sum of the vertical dimensions of the upper and lower guide members 17A is shorter than the distance between the upper and lower plates 4U and 4D, and the lower protruding portion 17cd of the upper guide member 17A and the upper protruding portion 17cu of the lower guide member 17A are spaced apart. And these two protrusion parts 17c form the division part 17b which divides the said hose arrangement | positioning space Q into three upper and lower sections, respectively.
The respective cover portions 17a of the upper and lower guide members 17A cover the outside of the hydraulic hoses H1, H2, H3, and H4, and the hydraulic hoses H1, H2, H3, and H4 inserted between the upper and lower guide members 17A correspond to the thickness. It is divided into three types, and the various hoses are stable in a state where they deviate from each other in each division, and they are not replaced. The hydraulic hoses in the upper and lower central sections are covered with a hose cover 18 to prevent separation.

The hydraulic hoses H1 and H2 and the hydraulic hoses H3 may be arranged upside down. In FIGS. 1 and 3, the hydraulic hoses H1 and H2 are on the lower side, and in FIG. 6, the hydraulic hoses H1 and H2 are on the upper side. It is shown.
The guide member 17B of the second embodiment shown in FIG. 7 uses a U-shaped round bar, the sum of vertical dimensions is longer than the interval between the upper and lower plates 4U, 4D, and the lower protrusion 17cd of the upper guide member 17B is lower. The two projecting portions 17c are displaced in the longitudinal direction of the second boom 4 and are separated from each other into three upper and lower sections, respectively. A delimiter 17b is formed.

Each of the cover portions 17a of the upper and lower guide members 17B covers the outside of the hydraulic hoses H1, H2, and H3, and both the cover portions 17a of the upper and lower guide members 17B are overlapped and jointed with the hydraulic hose H4 inserted therebetween. Covered.
The guide member 17C of the third embodiment shown in FIG. 8 is formed by bending two round bars into L-shapes to form a cover portion 17a and a protruding portion 17c at one end thereof. The upper end is fixed to the upper plate 4U, the lower protruding portion 17cd is opposed to the right plate 4R, the lower end of the lower guide member 17C is fixed to the lower plate 4D, and the upper protruding portion 17cu is opposed to the right plate 4R. ing.

The sum of the vertical dimensions of the upper and lower guide members 17C is shorter than the distance between the upper and lower plates 4U and 4D, and the lower protruding portion 17cd of the upper guide member 17C and the upper protruding portion 17cu of the lower guide member 17C are spaced apart. And these two protrusion parts 17c form the division part 17b which divides the said hose arrangement | positioning space Q into three upper and lower sections, respectively.
Similarly to the guide member 17A, the cover portions 17a of the upper and lower guide members 17C cover the outside of the hydraulic hoses H1, H2, and H3, and the hydraulic hose H4 inserted between the upper and lower guide members 17A is hung by the hose cover 18. Covered.

The guide member 17D of the fourth embodiment shown in FIG. 9 is formed with a plurality of cover portions 17a made of a bar material fixed to one of the upper and lower plates 4U, 4D, and one or a plurality of protrusions perpendicular to the bar material. A partitioning portion 17b is formed by fixing the material to partition the hose arrangement space Q into a plurality of upper and lower sections.
The plurality of cover portions 17a of the upper and lower guide members 17B cover the outer sides of the hydraulic hoses H1 to H4.
A guide member 17E of the fifth embodiment shown in FIG. 10 is formed by bending one round bar into a U-shape to form a cover portion 17a and projecting portions 17c at both ends thereof, and an upper projecting portion 17cu on the upper side. Adhering to the plate 4U, the lower projecting portion 17cd forms a partitioning portion 17b, and a single straight bar that forms the cover 17a is projected downward from the lower projecting portion 17cd. The protrusion 17 is fixed to form the partitioning portion 17b.

The guide member 17E divides the hose arrangement space Q into three types of spaces having different vertical lengths and / or widths by a U-shaped member, a straight bar, and a protrusion.
In the present invention, the shape of each member and the positional relationship between the front, rear, left, and right in the embodiment are best configured as shown in FIGS. However, it is not limited to the said embodiment, A member, a structure can be variously deformed, and a combination can also be changed.
For example, the guide member 17 may be arranged at a plurality of positions in the longitudinal direction of the second boom 4, and a fixing method other than welding, for example, the end of the bar is made flat on the upper and lower plates 4U, 4D. It may be fastened with a screw, or may be fastened with a nut through the upper and lower plates 4U, 4D by cutting a screw at the end of the bar.

In addition, the guide member 17A or 17B and the guide member 17C are combined, or the upper and lower parts of the guide members 17A, 17B, and 17C are used instead of round bars, or those having different lengths are used. Or may be attached such that the distance from the right side plate 4R to the cover portion 17a is different.
Further, the guide member 17 may be attached to the base member 4B instead of the hose guide 20 or attached to the tip member 4S.
The guide member 17 can also be applied to the first boom 2 other than the second boom 4, the third boom 6, the arm 29, and the like.

DESCRIPTION OF SYMBOLS 1 Backhoe 2 1st boom 4 2nd boom 4U Upper plate 4D Lower plate 4L Left side plate 4R Right side plate 6 3rd boom 9 Hydraulic hose 17 Guide member 17a Cover part 17b Separation part 17c Projection part 18 Hose cover H Hydraulic hose Q Hose arrangement space

Claims (4)

A pair of left and right side plates (4L, 4R) are fixed between a pair of upper and lower plates (4U, 4D) to form a boom (4), and one side plate (left and right side) from the base end side to the tip end side of the boom (4) ( 4R), a boom of a swing work machine in which a plurality of hydraulic hoses (H) are arranged,
The side plate (4R) along which the hydraulic hose (H) extends is arranged on the inner side of at least one of the left and right side edges of the upper and lower plates (4U, 4D), and the hose arrangement space (Q) is provided on the side of the side plate (4R). Formed,
A guide member (a longitudinal halfway portion of the hydraulic hose (H) along the side plate (4R) on at least one side edge of the upper and lower plates (4U, 4D) protruding outward from the side plate (4R). 17) is fixed at the top and bottom ends,
The guide member (17) includes a cover (17a) that covers the outside of the hydraulic hose (H), and extends from the cover (17a) to the side plate (4R) side. The hose arrangement space (Q) A boom structure for a swing work machine, comprising: a partitioning portion (17b) for partitioning the top and bottom.   The boom structure of the swivel working machine according to claim 1, wherein the guide member (17) is formed of a round bar, and one end thereof is welded to the upper and lower plates (4U, 4D).   The guide member (17) is bent from both ends of the cover (17a) that covers the outside of the hydraulic hose (H), and has a protruding portion (17c) extending toward the side plate (4R) to form a U-shape. The guide member (17) is a set of two, and the upper protrusion (17cu) of one guide member (17) is fixed to the upper plate (4U), and the other guide member (17) The lower protrusion (17cd) is fixed to the lower plate (4D), and the lower protrusion (17cd) of one guide member (17) and the upper protrusion (17cu) of the other guide member (17) are vertically spaced. The boom structure of the swivel working machine according to claim 1 or 2, wherein a partition part (17b) for separating the hose arrangement space (Q) vertically is formed by opening the hose.   The guide member (17) is bent from one end of a cover (17a) that covers the outside of the hydraulic hose (H), and has a protruding portion (17c) extending toward the side plate (4R) to form an L shape. The upper end of the cover (17a) of one guide member (17) is fixed to the upper plate (4U), and the other guide member (17). The lower end of the cover portion (17a) is fixed to the lower plate (4D), and the protruding portion (17c) of one guide member (17) and the protruding portion (17c) of the other guide member (17) are vertically spaced. The boom structure of the swivel working machine according to claim 1 or 2, wherein a partition part (17b) for separating the hose arrangement space (Q) vertically is formed by opening the hose.

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