JP2001214467A - Rotary construction equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a hydraulic hose from being damaged due to contact with obstacles and to simplify a structure of rotary frames and lighten the weight. SOLUTION: A group of hydraulic hose 28 for working cylinders are led to the side of a connecting pin 14 by passing on the side of the outer surface of a vertical plate 7 on the right found on a rotary frame 4 from a group of control valves, and connect to a group of hydraulic piping 3G of the working device by raising them from a place between the connecting pin 14 and a swing post 10. As the group of hydraulic hose 28 can pass by above a bottom plate 5 of the rotary frame 4, we can prevent the group of hydraulic hose 28 from contacting with obstacles when equipment is rotating. Since the group of hydraulic hose 28 is connected to a group of hydraulic piping 3G of the working device with passing neither the tip 5A of a bottom plate located on the rotary frame, a vertical plate on the left, a vertical plate 7 on the right, nor a top plate 9, a penetrating hole for the hydraulic hose formed on the rotary frame 4 can be made smaller by the volume of the group of hydraulic hose 28, and the strength of the rotary frame 4 can be heightened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing type construction machine suitably used as, for example, a hydraulic shovel, a hydraulic crane and the like.

[0002]

2. Description of the Related Art In general, a hydraulic shovel or the like is known as a swing type construction machine. The hydraulic excavator is composed of a lower traveling body and an upper revolving body pivotally mounted on the lower traveling body, and a work device for excavating earth and sand, etc., is raised and lowered on a front side of the upper revolving body. It is provided as possible.

[0003] Also, among hydraulic excavators, there is a small hydraulic excavator called a mini excavator which has a swing mechanism for swinging a working device to the left and right with respect to an upper revolving unit (for example, Japanese Patent Application Laid-Open No. HEI 9-110572). No. 9-242107,
JP-A-11-93211, etc.).

Here, the revolving frame constituting the fixed side of the swing mechanism is a flat bottom plate, left and right vertical plates extending forward and rearward from the bottom plate, and each of the vertical plates. And an upper plate provided on the front side.

On the other hand, a swing post constituting the movable side of the swing mechanism is located at the front end side of the revolving frame and is attached between the bottom plate and the upper plate via a connecting pin so as to be swingable left and right. ing. A working device including a boom, an arm, and a bucket and a boom cylinder, an arm cylinder, and a bucket cylinder for driving the boom, the arm, and the bucket are attached to the swing post. Then, pressure oil is supplied to and discharged from each cylinder of the working device from a control valve group mounted on the turning frame via a hydraulic hose.

The hydraulic excavator according to the prior art is configured as described above. When performing an operation such as digging a ditch with the hydraulic excavator, the working device is swung left and right together with a swing post by a swing cylinder. At the same time, the upper revolving unit is swiveled by the same angle in the direction opposite to the swing direction of the working device. As a result, the working device is moved in parallel to the left and right directions, so that the trench can be dug in this state.

[0007]

In the hydraulic excavator disclosed in Japanese Patent Application Laid-Open No. 9-242107, the hydraulic hose connected to the working device is moved from the control valve group provided on the turning frame to the side of the vertical plate. And extends to the lower side of the bottom plate, rises from the lower side of the bottom plate so as to pass through the inside of the swing post, and is connected to the pipe on the working device side.

However, in the hydraulic excavator disclosed in Japanese Patent Application Laid-Open No. 9-242107, the hydraulic hose is routed at a position lower than the bottom plate. The hydraulic hose protruding downward may be caught by an obstacle and may be damaged.

In a small hydraulic excavator, the size of the upper swing body is small, so that wiring and various hydraulic hoses must be routed in a limited space. Therefore, a small-sized hydraulic excavator has through holes formed in the left and right vertical plates, upper plate, etc. of the revolving frame, and a plurality of hydraulic hoses are passed through the through holes. It is connected to each cylinder of the device, the hydraulic motor for traveling, etc.

However, since the bottom plate, the vertical plate, and the upper plate of the revolving frame are strength members for increasing the strength of the revolving frame, they can be used for swing cylinders, working device cylinders, traveling hydraulic motors and the like. If a large through hole for passing a number of extending hydraulic hoses is formed, there is a problem that the strength of the revolving frame is reduced.

In order to solve this problem, a bottom plate, a vertical plate,
There have also been measures to increase the strength of the revolving frame by increasing the thickness of the upper plate and the like and devising the shape, but in this case, the structure of the revolving frame becomes complicated and the weight increases. There is a problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in the prior art, and an object of the present invention is to prevent a hydraulic hose from being damaged by contact with an obstacle. Is to provide.

Another object of the present invention is to eliminate the need for drilling holes for passing a hydraulic hose for a working cylinder through a bottom plate, a vertical plate, an upper plate, etc., constituting a revolving frame, thereby simplifying the revolving frame and reducing its weight. It is an object of the present invention to provide a swivel type construction machine capable of realizing the construction.

[0014]

In order to solve the above-mentioned problems, a revolving construction machine according to the first aspect of the present invention comprises a lower traveling body and an upper revolving body rotatably mounted on the lower traveling body. And a working device provided at the front of the upper revolving unit so as to be able to move up and down.
A revolving frame in which left and right vertical plates extending in the rearward direction are erected and an upper plate is provided on the front side of each of the vertical plates, and the revolving frame for supporting the working device to be swingable in the left and right directions. A swing post is provided at a front end side of the frame and supported between the bottom plate and the upper plate via a connecting pin.

The first aspect of the present invention is characterized in that a hydraulic hose for supplying and discharging pressurized oil to and from a working cylinder provided in a working device passes from an outer surface of a vertical plate to a side of a connecting pin, The configuration is such that it stands up from the space between the connecting pin and the swing post.

With this configuration, the hydraulic hose passes by the connecting pin from the outer surface of the vertical plate.
The hydraulic hose can be routed higher than the bottom plate of the turning frame. Accordingly, it is possible to prevent the hydraulic hose from contacting an obstacle and being damaged when the lower traveling body is caused to travel or the upper revolving body swings.

A feature of the structure adopted by the invention of claim 2 is that a control valve group is provided on the bottom plate of the revolving frame, located outside one of the left and right vertical plates, The hydraulic hose extending from the control valve group to the working device is configured to be guided to the side of the connecting pin through the outer surface of the one vertical plate.

With this configuration, the hydraulic hose extending from the control valve group to the working device reaches the side of the connecting pin through the outer surface of the vertical plate of the turning frame.
Hydraulic hose through holes formed in the bottom plate, each vertical plate, the upper plate, and the like that constitute the turning frame can be reduced by the amount of the hydraulic hose used in the work cylinder, and the strength of the turning frame can be increased. .

According to the third aspect of the present invention, one of the left and right vertical plates is bent toward the other vertical plate before the connecting pin, and the bent portion of the one vertical plate and the connecting pin are connected to each other. In the meantime,
The present invention has a configuration in which a slack accommodating space for accommodating a slack generated in the hydraulic hose when the swing post swings to one side is provided.

With this configuration, the slack portion generated in the hydraulic hose when the swing post swings to one side is accommodated in the slack accommodating space, so that the slack portion of the hydraulic hose projects outward. It is possible to prevent a situation such as contact with an obstacle.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A small-sized hydraulic excavator will be described below as an example of a swing-type working machine according to an embodiment of the present invention.
This will be described in detail with reference to the accompanying drawings. In the present embodiment, “front, rear” and “left, right” are used as meaning directions or positions viewed from an operator sitting in a driver's seat.

First, FIG. 1 to FIG. 8 show a first embodiment of the present invention. Reference numeral 1 denotes a lower traveling body of a hydraulic shovel, 2 denotes an upper revolving body mounted on the lower traveling body 1 so as to be pivotable, and a work device 3 for excavating earth and sand is provided in front of the upper revolving body 2. Is provided.

Here, the working device 3 includes a boom 3A attached to the swing post 10 to be described later so as to be able to ascend and descend, an arm 3B attached to the tip of the boom 3A so as to be able to ascend and descend, and an arm 3B. This is roughly constituted by a bucket 3C rotatably attached to the distal end. Also,
A boom cylinder 3D is provided between the swing post 10 and the boom 3A, an arm cylinder 3E is provided between the boom 3A and the arm 3B, and a bucket cylinder 3F is provided between the arm 3B and the bucket 3C. Have been. Further, the working device 3 is provided with a hydraulic piping group 3G extending from the back of the boom 3A and including a plurality of hydraulic piping connected to the boom cylinder 3D, the arm cylinder 3E, and the bucket cylinder 3F.

Reference numeral 4 denotes a revolving frame which forms the base of the upper revolving unit 2. The revolving frame 4 includes a bottom plate 5, a left vertical plate 6, a right vertical plate 7, and an upper plate, as shown in FIGS. 9 and the like.

Reference numeral 5 denotes a bottom plate of the revolving frame 4, and the bottom plate 5 is formed as a substantially circular flat plate. Also, the bottom plate 5
Is provided on the front side with a substantially triangular bottom plate tip 5A which is located near the center right side and extends forward, and a boss 5B into which a connecting pin 14 described later is inserted is fitted at the tip of the bottom plate tip 5A.
Is provided.

Reference numeral 6 denotes a left vertical plate erected on the bottom plate 5, and the left vertical plate 6 gradually inclines rightward from a rear portion 6A disposed closer to the left side of the bottom plate 5 toward the front, and has a front portion 6B. Extend to the vicinity of the boss 5B along the left end of the bottom plate tip 5A.
A bracket 6C to which a swing cylinder 15 described later is attached is fixed to a rear portion 6A of the left vertical plate 6.

On the other hand, 7 is a right vertical plate erected on the bottom plate 5,
The right vertical plate 7 extends substantially straight forward and rearward at a position on the right side of the bottom plate tip 5A. 5 and 7, the right vertical plate 7 is provided with a bent portion 7A by bending its front side to the left in front of the boss portion 5B, and the distal end of the bent portion 7A has a left end. It is fixed to the front part 6B of the vertical plate 6.
Thereby, a slack accommodation space 8 is formed between the bent portion 7A of the right vertical plate 7 and the connecting pin 14 (the boss portion 5B of the bottom plate 5) described later.

Here, the slack accommodating space 8 accommodates a slack portion 28A generated in the hydraulic hose group 28 to be described later when the swing post 10 (working device 3) is swung to the right.

Reference numeral 9 denotes an upper plate located in front of the left and right vertical plates 6 and 7 and fixed above the respective vertical plates 6 and 7.
Protrudes in substantially the same shape as the bottom plate tip 5A such that the tip side faces the bottom plate tip 5A of the bottom plate 5. Also,
A boss 5 provided at the tip 5A of the bottom plate is provided at the tip of the upper plate 9.
A boss 9A is provided at a position coaxial with B.

Here, the bottom plate 5, the left vertical plate 6, the right vertical plate 7, and the upper plate 9 constitute a strength member for increasing the strength of the revolving frame 4. Thereby, the working device 3 can be reliably supported on the turning frame 4.

A swing post 10 is provided at the front end of the revolving frame 4 so as to be swingable.
As shown in FIGS. 5 and 6, a mounting bracket 11 is formed by bending a bottom end 5A of the bottom plate 5 and an upper plate 9 in a U-shape so as to sandwich the bottom plate 5 from above and below. 1
1, working equipment mounting plates 12, 12 which are separated in the left and right directions and extend substantially parallel to the front side and the upper side, and a cylinder bracket 13 provided to protrude to the left from the working equipment mounting plate 12 on the left side. It is constituted by. Here, the mounting bracket 11 is formed with a through hole 11A which is located substantially at the center and through which a hydraulic hose group 28 described later is inserted. The boom 3A and the boom cylinder 3D of the working device 3 are mounted on the left and right working device mounting plates 12, 12, respectively.

The swing post 10 configured as described above
Is a bottom plate tip 5A of the bottom plate 5 by the mounting bracket 11.
The upper plate 9 and the upper plate 9 are sandwiched from above and below.
It is mounted so that it can swing to the right.

Reference numeral 14 denotes a turning frame 4 and a swing post 1.
0, and the connecting pin 14 is
The tip 5A of the bottom plate of the revolving frame 4, the upper plate 9, and the mounting bracket 11 are inserted upward and downward in the upward direction.
A swing post 10 is connected to the revolving frame 4 so as to swing leftward and rightward.

A swing cylinder 15 extends along the left vertical plate 6. The swing cylinder 15 has a base end attached to the bracket 6C of the left vertical plate 6 and a distal end attached to the cylinder bracket 13 of the swing post 10. ing. Thus, the swing cylinder 15 swings the working device 3 left and right together with the swing post 10 by contracting and extending.

Reference numeral 16 denotes a counter weight attached to the rear end of the turning frame 4. The counter weight 16
The weight balance with the working device 3 is formed in an arc shape corresponding to a turning radius.

Reference numeral 17 denotes an engine mounted on the revolving frame 4. The engine 17 is disposed on the rear side of the revolving frame 4 and in front of the counterweight 16 in a horizontal state extending leftward and rightward. I have. A hydraulic pump 18 is mounted on the left side of the engine 17, and a radiator 19 and the like are arranged near the right side. Further, a hydraulic oil tank 20 is provided in front of the radiator 19.

Reference numeral 21 denotes a control valve group disposed on the front right side of the revolving frame 4. The control valve group 21 includes a plurality of directional control valves which are stacked on the bottom plate 5 so as to be arranged frontward and rearward. Have been. The control valve group 21 switches supply and discharge of pressure oil to each of the cylinders 3D, 3E, 3F, the swing cylinder 15, the traveling hydraulic motor, the turning hydraulic motor (all not shown), etc. of the working device 3. , And these operations are controlled.

Reference numeral 22 denotes a left skirt cover that covers from the left front corner of the turning frame 4 to the counterweight 16; 23, a right skirt cover that covers from the front right portion of the turning frame 4 to the counterweight 16; A front skirt cover covering the front portion is shown, and the front skirt cover 24 is formed with a hose opening 24A (shown in FIG. 2) through which a hydraulic hose group 28 passes.

Further, reference numeral 25 denotes a floor plate provided so as to cover the upper front side of the revolving frame 4, 26 denotes a driver's seat disposed on the floor plate 25, and 27 denotes a right side to a rear side of the driver's seat 26. 3 shows an exterior cover that covers the engine 17 and the like.

Reference numeral 28 denotes a working cylinder hydraulic hose group extending from the control valve group 21 toward the working device 3, and the hydraulic hose group 28 supplies and discharges pressure oil to and from the boom cylinder 3D.
Hydraulic hoses, two hydraulic hoses for supplying and discharging hydraulic oil to and from the arm cylinder 3E, and two hydraulic hoses for supplying and discharging hydraulic oil to and from the bucket cylinder 3F. ing.

Here, the routing of the hydraulic hose group 28 will be described. First, the hydraulic hose group 28 extends forward from the control valve group 21 through the outer surface side of the right vertical plate 7 constituting the revolving frame 4, and projects outside through the hose opening 24 </ b> A of the front skirt cover 24. The hydraulic hose group 28 protruding to the outside extends beside the connecting pin 14 supporting the swing post 10 so that the connecting pin 14 is wound around in the space between the connecting pin 14 and the swing post 10. It bends to the left and rises upward, passing through a through hole 11A formed in the mounting bracket 11. The hydraulic hose group 28 protruding forward from the mounting bracket 11 passes through the space between the mounting bracket 11 and the boom 3A while bending upward in an S shape, and is connected to the hydraulic piping group 3G of the working device 3. .

Thus, the hydraulic hose group 28 according to the present embodiment can swing without swinging through any of the bottom plate 5, the left vertical plate 6, the right vertical plate 7, and the upper plate 9 that constitute the strength member of the revolving frame 4. It can lead to the post 10.
Further, the hydraulic hose group 28 can be routed on the outer surface side of the right vertical plate 7, that is, at a position higher than the bottom plate 5 of the turning frame 4.

The hydraulic excavator according to the present embodiment has the above-described configuration. Next, the operation of performing the trench excavation work and the operation of the hydraulic hose group 28 will be described.

First, when the working device 3 is moved to the left side of the vehicle body to perform a trench excavation work, the swing cylinder 15
To swing the swing post 10 connected to the front side of the revolving frame 4 to the right. In addition, the upper swing body 2 is swung by the same angle to the opposite side to the swing direction of the working device 3, that is, to the left. As a result, the working device 3 moves to the left in parallel, so that the boom 3A and the arm 3
B, the bucket 3C and the like are operated to perform a trench excavation work.

Here, when the swing post 10 is swung to the right, as shown in FIG. 8, the slack portion 28A is attached to the connecting pin 14, the hydraulic hose group 28 for the working cylinder arranged on the right side of the right vertical plate 7. Occurs. However, in the present embodiment, since the slack accommodating space 8 is provided between the bent portion 7A of the right vertical plate 7 and the connecting pin 14, the slack portion 28A is accommodated in the slack accommodating space 8 and the slack portion 28A is accommodated. The portion 28A is prevented from protruding outside.

On the other hand, when the work apparatus 3 is moved to the right side of the vehicle body to perform the digging work, by performing the operation opposite to the above-described operation, the digging work can be performed on the right side.

As described above, according to the present embodiment, the hydraulic hose group 28 is guided from the control valve group 21 to the side (near) of the connecting pin 14 through the outer surface of the right vertical plate 7 of the turning frame 4. It is configured to rise up between the connecting pin 14 and the swing post 10 and to be connected to the hydraulic piping group 3G of the working device 3. Therefore, since the hydraulic hose group 28 passes above the bottom plate 5 of the turning frame 4, it is possible to prevent a situation in which the hydraulic hose is caught by an obstacle during the turning operation as described in the related art. The group 28 can be prevented from being damaged, and the reliability can be improved.

Also, since it is not necessary to pass the hydraulic hose group 28 for the working cylinder through the bottom plate tip 5A, the left vertical plate 6, the right vertical plate 7, the upper plate 9 and the like of the revolving frame 4, the swing can be applied to these plates. The through hole for the hydraulic hose for supplying and discharging the pressure oil to the cylinder 15, the traveling hydraulic motor, the turning hydraulic motor, and the like is only small. As a result, it is possible to prevent a decrease in strength due to the through hole, so that sufficient strength can be obtained even if the thickness of the revolving frame 4 is reduced, for example.

As a result, since the weight of the turning frame 4 can be reduced, the position of the center of gravity of the hydraulic excavator can be lowered, and the stability during operation and running can be improved. Further, the structure of the revolving frame 4 can be simplified, and the manufacturing cost can be reduced. Further, since the hydraulic hose group 28 can be easily routed, inspection and replacement work of the hydraulic hose group 28 can be easily performed, and free routing can be performed.

When the swing post 10 is swung to the right, the slack portion 28A of the hydraulic hose group 28 can be accommodated in the slack housing space 8, so that the hydraulic hose group 28 (slack portion 28A) Can be prevented, and the hydraulic hose group 28 can be prevented from being damaged.

In the control valve group 21, a plurality of directional control valves are stacked on the bottom plate 5 so that the control valve group 21 can be installed low.
Can be lowered. Thereby, the height dimension of the upper-part turning body 2 can be kept low, and the stability can be improved.
In addition, the field of view at the time of work can be expanded, and workability can be improved.

On the other hand, a hydraulic hose for supplying and discharging hydraulic oil to each of the cylinders 3D, 3E, 3F, the swing cylinder 15, the traveling hydraulic motor, the turning hydraulic motor and the like of the working device 3 is connected to the turning frame 4 on the hydraulic shovel. When the present embodiment is applied to this type of hydraulic excavator, the number of hydraulic hoses passing between the turning frame 4 and the floor plate 25 is determined by the hydraulic pressure for the working cylinder. Since the number of hoses 28 can be reduced, the floor plate 25 can be disposed adjacent to the upper side of the revolving frame 4. Thus, the position of the floor plate 25 can be lowered, and getting on and off the driver's seat 26 can be facilitated.

Next, FIG. 9 shows a second embodiment of the present invention. The feature of this embodiment lies in that the swing post is supported by two connecting pins with respect to the turning frame.
In the present embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 31 denotes a swing post according to the present embodiment which is used in place of the swing post 10 according to the first embodiment. The swing post 31 sandwiches the bottom plate tip 5A of the bottom plate 5 from above and below. A lower bracket 32 formed in a horizontal U-shape, and an upper bracket formed in a horizontal U-shape so as to be disposed above the lower bracket 32 with a space therebetween and sandwich the upper plate 9 from above and below. 33, and a pair of working device mounting plates 34 (only the right side is shown) that are provided integrally with the lower bracket 32 and the upper bracket 33 and that are separated in the left and right directions and extend substantially parallel to the front side and the upper side. Have been.

Reference numeral 35 denotes a short lower connecting pin inserted between the lower bracket 32 of the swing post 31 and the boss 5B of the bottom plate tip 5A. Reference numeral 36 denotes an upper bracket 33 of the swing post 31 and the upper plate 9 of the upper plate 9. A short upper connecting pin inserted and fitted to the boss 9A is shown. The connecting pins 35 and 36 connect the swing post 31 to the revolving frame 4 so as to swing left and right. I have.

Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operation and effect as in the first embodiment. In particular, in the present embodiment, the swing post 31 is connected to the short connecting pin 3 with respect to the turning frame 4.
5, 36, the connecting pins 35, 3
The hydraulic hose group 28 can be passed using the space beside 6, that is, the space between the connecting pins 35 and 36, and the work of routing the hydraulic hose group 28 can be easily performed.

In each embodiment, the turning frame 4
The control valve group 21 is disposed on the right side of the right vertical plate 7 and the hydraulic hose group 28 is routed on the right side of the right vertical plate 7. However, the present invention is not limited to this. The valve group 21, the hydraulic hose group 28, and the like may be arranged on the left side of the left vertical plate 6.

In each of the embodiments, a hydraulic shovel has been described as an example of a swing type construction machine. However, the present invention is not limited to this, and is applicable to other swing type construction machines such as a hydraulic crane. You may.

[0059]

As described above in detail, according to the first aspect of the present invention, the hydraulic hose for supplying and discharging the pressurized oil to and from the working cylinder provided in the working device is provided so that the side of the connecting pin extends from the outer surface of the vertical plate. As described above, since it is configured to rise upward from the space between the connecting pin and the swing post, it is possible to prevent the hydraulic hose from projecting below the turning frame. Accordingly, it is possible to prevent the hydraulic hose from contacting and damaging an obstacle when the lower traveling body is driven or the upper revolving body makes a swing operation, thereby improving reliability.

According to the second aspect of the present invention, a control valve group is provided on the bottom plate of the revolving frame outside one of the left and right vertical plates, and the control valve group is operated from the control valve group. Since the hydraulic hose extending to the apparatus is configured to be guided to the side of the connecting pin through the outer surface side of the one vertical plate, it is necessary to pass the hydraulic hose through any of the bottom plate, the vertical plate, and the upper plate constituting the revolving frame. Therefore, the through holes for the hydraulic hoses formed in these bottom plates, vertical plates, upper plates, etc. can be reduced by the amount of the hydraulic hoses used in the working cylinder, and the strength of the turning frame can be increased. it can.

As a result, since the weight of the turning frame can be reduced, the position of the center of gravity of the excavator can be lowered, and the stability during operation and running can be improved. Further, the structure of the revolving frame can be simplified, and the manufacturing cost can be reduced. Furthermore, since the hydraulic hose can be easily routed, the replacement work of the hydraulic hose can be easily performed, and free routing can be performed.

According to the third aspect of the present invention, one of the left and right vertical plates is bent toward the other vertical plate before the connecting pin, and the bent portion of the one vertical plate and the connecting pin are connected to each other. In between,
Since the slack accommodating space for accommodating the slack generated in the hydraulic hose when the swing post swings to one side is provided, it is possible to prevent a situation in which the slack portion of the hydraulic hose projects outward and contacts an obstacle. Can extend the life of the hydraulic hose.

[Brief description of the drawings]

FIG. 1 is a front view showing a hydraulic excavator according to a first embodiment of the present invention.

FIG. 2 shows a hydraulic excavator in a state where a working device is omitted in FIG.
It is the right view seen from the inside front side.

FIG. 3 is a plan view showing the upper swing body in a state where a floor plate and an exterior cover are omitted.

FIG. 4 is an enlarged front view of a main part showing a state in which a swing post is attached to a turning frame.

FIG. 5 is an enlarged plan view of a main part showing a state in which a swing post is attached to a turning frame.

6 is an enlarged cross-sectional view of a front portion of the revolving frame, a swing post, a connecting pin, and a group of hydraulic hoses, as viewed in a direction indicated by arrows VI-VI in FIG.

FIG. 7 shows the state of the operation of the hydraulic hose group as indicated by an arrow V in FIG.
It is the expanded sectional view seen from the II-VII direction.

FIG. 8 shows a state in which the swing post is swung rightward.
It is the expanded sectional view seen from the position similar to.

FIG. 9 is an enlarged front view of a main part of the swing post according to the second embodiment of the present invention as viewed from the same position as in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving unit 3 Work device 3A boom 3B arm 3C bucket 3D boom cylinder 3E arm cylinder 3F bucket cylinder 3G Hydraulic piping group 4 Revolving frame 5 Bottom plate 5A Bottom plate tip 6 Left vertical plate 7 Right vertical plate 7A bending part 8 Slack accommodating space 9 Upper plate 10, 31 Swing post 14, 35, 36 Connecting pin 21 Control valve group 28 Hydraulic hose group for working cylinder 28A Slack section

Continuing on the front page (72) Inventor Koji Nishimura 650, Kandate-cho, Tsuchiura-shi, Ibaraki Prefecture Inside the Tsuchiura Plant of Hitachi Construction Machinery Co., Ltd. F-term in the factory (reference) 2D015 BA01

Claims (3)

[Claims] 1. An undercarriage, an upper revolving body rotatably mounted on the lower traveling body, and a working device provided at a front portion of the upper revolving body so as to be capable of elevating and lowering, The revolving structure includes a revolving frame in which left and right vertical plates extending in the front and rear directions are erected on a bottom plate, and an upper plate is provided in front of each of the vertical plates, and the working device is swung left and right. A swing type construction machine comprising: a swing post supported at a front end side of the swing frame and supported between a bottom plate and an upper plate via a connecting pin in order to support the swing frame. The hydraulic hose that supplies and discharges the pressure oil to and from the working cylinder passes through the side of the connecting pin from the outer surface of the vertical plate, and rises upward from the space between the connecting pin and the swing post. And revolving construction machinery. 2. An undercarriage, an upper revolving body rotatably mounted on the lower traveling body, and a working device provided at the front of the upper revolving body so as to be able to ascend and descend, The revolving structure includes a revolving frame in which left and right vertical plates extending in the front and rear directions are erected on a bottom plate, and an upper plate is provided in front of each of the vertical plates, and the working device is swung left and right. A swing type construction machine comprising: a swing post positioned at a front end side of the swing frame and supported between a bottom plate and an upper plate via a connecting pin so as to support the swing frame. On the upper side, a control valve group is provided outside one of the left and right vertical plates, and a hydraulic hose extending from the control valve group to the working device is provided on an outer surface of the one vertical plate. A swiveling construction machine characterized in that it is configured to be guided to the side of the connecting pin through the side. 3. One of the left and right vertical plates is bent toward the other vertical plate in front of the connecting pin, and between the bent portion of the one vertical plate and the connecting pin, 3. The swiveling construction machine according to claim 1, wherein a slack accommodating space for accommodating a slack generated in the hydraulic hose when the swing post swings to one side is provided. 4.