JP7166307B2 - construction machinery - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to a construction machine such as a hydraulic excavator equipped with a dumping device whose attitude can be controlled.

In general, a hydraulic excavator, which is a representative example of construction machinery, includes a self-propellable undercarriage having a track frame and an upper revolving body mounted on the track frame via a revolving device so as to be revolvable. . A work device for performing excavation work or the like is provided at the front portion of the upper revolving structure. Further, a center joint is provided at the turning center of the upper revolving body for circulating hydraulic oil between the upper revolving body and the lower traveling body even when the upper revolving body performs a revolving motion. Further, the undercarriage is provided with a soil removing device for performing ground leveling work. This soil unloading device is attached to a track frame so as to be vertically rotatable at its base end, and has a blade at its tip end.

A ground leveling system using a hydraulic excavator equipped with an unloading device uses a ground leveling system that controls the attitude of a blade according to three-dimensional ground data based on a land leveling plan. A hydraulic excavator used in this land leveling system includes an attitude detection sensor attached to a blade, a controller mounted on an upper revolving structure, and a harness device that connects the attitude detection sensor to the controller.

In the leveling work, the posture of the blade is continuously measured by the posture detection sensor, and the measurement result (blade posture information) is transmitted to the controller via the harness device. Thereby, the controller controls the attitude of the blade by comparing the attitude information of the blade and the three-dimensional data of the ground based on the land leveling plan, and performs the land leveling work according to the land leveling plan.

Here, in the hydraulic excavator, an upper revolving body provided with a controller performs a revolving motion with respect to a lower traveling body provided with an earth removing device (posture detection sensor). For this reason, the harness device utilizes a slip ring provided at the center joint so that the posture detection sensor on the lower traveling body side and the controller on the upper revolving body side are energized even during the revolving movement of the upper revolving body. holding on.

Therefore, the harness device includes a controller-side harness that connects between the controller and the slip ring of the center joint, and a sensor-side harness that connects between the slip ring of the center joint and the attitude detection sensor. (Patent Document 1).

JP-A-4-366233

By the way, since the hydraulic excavator performs earth and sand excavation work and land leveling work, the exposed sensor-side harness may be damaged by an external factor such as a collision with rocks, earth and sand. When the sensor-side harness is damaged, the sensor-side harness is replaced. However, replacing the sensor-side harness requires removing the maintenance cover of the truck frame that covers the lower side of the center joint, and thus there is a problem that the replacement takes time and effort.

SUMMARY OF THE INVENTION An object of an embodiment of the present invention is to provide a construction machine in which a damaged harness can be easily replaced.

One embodiment of the present invention comprises a self-propellable lower traveling body having a track frame, an upper rotating body mounted on the track frame so as to be able to rotate via a rotating device, and a center of rotation of the upper rotating body. a center joint having a slip ring for maintaining an energized state between the lower traveling body and the upper revolving body; An earth removing device provided with a blade on the tip side, an attitude detection sensor provided on the blade for detecting the attitude of the blade, and an attitude of the blade provided on the upper revolving body detected by the attitude detection sensor. and a harness device for connecting the posture detection sensor to the controller, wherein the harness device connects the slip ring of the center joint to The posture detection sensor and the controller are connected via a harness device, and the harness device includes a controller-side harness provided by connecting between the controller and the slip ring of the center joint, and a harness of the center joint. A sensor-side harness provided to connect between the slip ring and the attitude detection sensor, the sensor-side harness being routed inside the track frame and having one end connected to the slip ring. an internal harness, an external harness routed outside the truck frame and having one end connected to the attitude detection sensor, and a connector detachably connecting the other end of the internal harness and the other end of the external harness. It is composed of

According to one embodiment of the present invention, it is possible to easily replace a damaged harness.

1 is a perspective view showing a hydraulic excavator according to an embodiment of the present invention; FIG. FIG. 4 is a cross-sectional view showing an enlarged peripheral portion of the turning device and the center joint; It is a perspective view which expands and shows the front part of a hydraulic excavator. FIG. 4 is an enlarged perspective view showing a state in which a hydraulic hose and a sensor-side harness are inserted through openings of a peripheral wall plate forming a track frame;

1 to 4, an embodiment of a construction machine according to the present invention will be described in detail with reference to FIGS.

In FIG. 1, a hydraulic excavator 1 is a representative example of a construction machine, and includes a crawler-type lower traveling body 2, an upper revolving body 4 mounted on the lower traveling body 2 so as to be able to turn via a revolving device 3, and a work device 5 provided in front of the upper revolving body 4 .

The lower traveling body 2 includes a track frame 6 and a traveling device 9 which will be described later. The track frame 6 includes a center frame 7 and a pair of side frames 8 positioned on both left and right sides of the center frame 7 and extending in the front-rear direction.

As shown in FIG. 2, the center frame 7 is arranged below the upper plate 7A supporting the slewing wheel 10 of the slewing device 3 and the upper surface plate 7A with a space therebetween. It includes a lower plate 7C forming an accommodation space 7B in which the center joint 18 is accommodated, and a peripheral wall plate 7D provided between the upper plate 7A and the lower plate 7C so as to surround the accommodation space 7B. . The upper surface plate 7A and the lower surface plate 7C have an opening at a position corresponding to the center of rotation, and a center joint 18 is arranged at the center of rotation within this opening.

In addition, an opening 7E is formed at a front position on the side of the earth removing device 19 in the peripheral wall plate 7D. Each hydraulic hose 20 and a sensor-side harness 26 of a harness device 24, which will be described later, are inserted through the opening 7E. Further, a maintenance cover 7F is detachably provided on the bottom plate 7C of the center frame 7 so as to cover the center joint 18 from below.

The traveling device 9 includes an idler wheel (not shown) provided at one end of the side frame 8, a drive wheel 9A provided at the other end of the side frame 8, and an idler wheel and the drive wheel 9A. It is composed of a crawler belt 9B that is wound around. Thereby, the lower traveling body 2 can be self-propelled by the traveling device 9 .

The turning device 3 is composed of a turning wheel 10 and a turning motor 11 . The slewing ring 10 has an inner ring 10A mounted coaxially with the center of slewing on the top plate 7A of the center frame 7 constituting the track frame 6, and a plurality of steel balls (not shown) on the outer peripheral side of the inner ring 10A. and an outer ring 10B that is rotatably mounted on the bottom plate 12A of the revolving frame 12 and attached to the bottom plate 12A. The inner side of the inner ring 10A becomes an internal gear 10C, and the pinion 11A of the turning motor 11 is meshed with the internal gear 10C.

As shown in FIG. 1, the upper revolving structure 4 includes a revolving frame 12, devices (not shown) such as a prime mover and a hydraulic pump provided on the rear side of the revolving frame 12, and a device provided to cover these devices. an exterior cover 14 positioned on the right side of the driver's seat pedestal 13 and covering a hydraulic oil tank and the like (not shown); a driver's seat 15 provided on the driver's seat pedestal 13; It includes an operating lever device 16 for work provided on both left and right sides of the seat 15 and an operating lever device 17 for driving provided in front of the driver's seat 15 .

The revolving frame 12 forms the base of the upper revolving body 4 and is mounted on the track frame 6 via the revolving device 3 . The revolving frame 12 includes a bottom plate 12A made of a thick steel plate or the like that extends in the front-rear direction, and a left vertical plate 12B and a right vertical plate 12C that stand on the bottom plate 12A and extend in the front-rear direction with a predetermined interval in the left-right direction. It has The front sides of the left vertical plate 12B and the right vertical plate 12C are close to each other and protrude forward to form a support bracket 12D that supports the working device 5. As shown in FIG.

The center joint 18 is arranged at the turning center of the turning device 3 and provided on the lower surface plate 7</b>C forming the center frame 7 of the track frame 6 . The center joint 18 is a device for circulating hydraulic oil and electricity between the lower traveling body 2 and the upper revolving body 4 . The center joint 18 includes a cylindrical body 18A attached to the track frame 6, a spindle 18B rotatably provided in the cylindrical body 18A and rotating together with the revolving frame 12, and a spindle 18B provided above the spindle 18B. A slip ring 18C is provided.

The spindle 18B and the slip ring 18C are connected to the cylindrical body 18A so that they can rotate relative to each other at the center of rotation of the rotating device 3 . A hydraulic line (not shown) on the side of the lower traveling body 2 is connected to the cylindrical body 18A, and a hydraulic line (not shown) on the side of the upper revolving body 4 is connected to the spindle 18B. Further, the slip ring 18C maintains an energized state between the lower traveling body 2 and the upper revolving body 4. As shown in FIG. Various harnesses including a harness device 24, which will be described later, are connected to the slip ring 18C.

Specifically, a controller-side harness 25 and a sensor-side harness 26 are connected to the slip ring 18C. In this case, the first end 27A of the inner harness 27 of the sensor-side harness 26 is connected to the slip ring 18C through a conduit extending upward from the bottom of the cylindrical body 18A.

As shown in FIGS. 1 and 3 , the earth removing device 19 is provided on the center frame 7 of the track frame 6 constituting the undercarriage 2 . The earth unloading device 19 is composed of a V-shaped elevating arm 19A whose base end side is attached to the center frame 7 of the track frame 6 so as to be rotatable in the vertical direction, and a rectangular plate-like body extending in the horizontal direction. The central portion of the blade 19B is rotatably attached to the tip of an elevating arm 19A, an elevating cylinder 19C, an angle cylinder 19D, and a tilt cylinder 19E.

The elevating cylinder 19C vertically rotates the blade 19B via the elevating arm 19A. The angle cylinder 19D rotates both lengthwise ends of the blade 19B in the front-rear direction around the attachment position to the elevating arm 19A. The tilt cylinder 19E vertically rotates both ends of the blade 19B in the longitudinal direction around the attachment position to the elevating arm 19A. These elevating cylinder 19C, angle cylinder 19D, and tilting cylinder 19E are connected to the cylindrical body 18A of the center joint 18 through hydraulic hoses 20, respectively.

Further, the blade 19B of the earth unloading device 19 is provided with a sensor mount 19F positioned near the center in the left-right direction (longitudinal direction). Further, prism mounts 19G are provided at both ends of the blade 19B in the horizontal direction. An orientation detection sensor 21, which will be described later, is attached to the sensor mounting base 19F. A prism 22, which will be described later, is selectively attached to each prism mount 19G according to the work site.

The attitude detection sensor 21 is mounted on a sensor mount 19F provided on the blade 19B of the earth removing device 19. As shown in FIG. The attitude detection sensor 21 detects the attitude of the blade 19B. The posture of the blade 19B in this case is the tilt angle of the blade 19B during the leveling work using the earth removing device 19, that is, the vertical inclination angle of both ends of the blade 19B. The posture detection sensor 21 detects the inclination angle (tilt angle) of the blade 19B and outputs this angle to the controller 23, which will be described later. A first end 28A of an external harness 28 constituting a sensor-side harness 26 to be described later is connected to the posture detection sensor 21 . Thereby, the posture detection sensor 21 is electrically connected to the controller 23 via the harness device 24 .

The prism 22 is mounted, for example, on a left prism mount 19G provided on the blade 19B of the earth removing device 19. As shown in FIG. The prism 22 is an object (target) that is tracked by an automatic tracking total station (not shown) during leveling work using the earth removing device 19 . The total station continuously measures the position and height of the blade 19B by tracking the prism 22, and wirelessly outputs the measurement results to the controller 23 as the position information of the blade 19B.

The ground leveling controller 23 is provided, for example, on the upper side of the exterior cover 14 that constitutes the upper swing body 4 . The controller 23 is attached to the exterior cover 14 using a bracket or the like. The controller 23 controls the earth removing device 19 (blade 19B) based on the attitude of the blade 19B detected by the total station and the attitude detection sensor 21 described above. As a result, the controller 23 can control the attitude of the blade 19B by comparing the attitude information of the blade 19B and the three-dimensional data of the ground based on the ground leveling plan when performing leveling work using the earth removing device 19. can.

Next, the configuration and function of the harness device 24, which characterizes this embodiment, will be described in detail.

The harness device 24 connects the attitude detection sensor 21 to the controller 23 . The harness device 24 connects the posture detection sensor 21 and the controller 23 via the slip ring 18C of the center joint 18 . The harness device 24 connects the controller side harness 25 provided by connecting between the controller 23 and the slip ring 18C of the center joint 18, and the slip ring 18C of the center joint 18 and the attitude detection sensor 21. and a sensor-side harness 26 provided.

A portion of the sensor-side harness 26 near the center joint 18 is arranged in the housing space 7B of the center frame 7 forming the track frame 6 . On the other hand, the portion near the attitude detection sensor 21 is exposed to the outside of the center frame 7 . In addition, the sensor-side harness 26 is composed of an internal harness 27 , an external harness 28 and a connector 29 .

The internal harness 27 is routed inside the truck frame 6 , that is, in the accommodation space 7</b>B of the center frame 7 . A first end 27A, which is one end in the length direction of the internal harness 27, extends upward from the bottom of the cylindrical body 18A of the center joint 18 and is connected to the slip ring 18C. On the other hand, a second end 27B, which is the other longitudinal end of the internal harness 27, protrudes through an opening 7E formed in a peripheral wall plate 7D of the center frame 7 and is connected to a connector 29. As shown in FIG.

As a result, most of the internal harness 27 is arranged in the housing space 7B of the center frame 7. As shown in FIG. Moreover, the second end 27B located outside the center frame 7 is arranged below the top plate 7A of the center frame 7 . Therefore, since the internal harness 27 is not hit by external factors such as rocks or earth and sand, the possibility of replacement due to damage due to collision is extremely low.

An external harness 28 is routed between the truck frame 6 and the attitude detection sensor 21 . As shown in FIG. 3, the external harness 28 extends forward along the lifting arm 19A, and a first end 28A, which is one end in the length direction, is connected to the attitude detection sensor 21. As shown in FIG. On the other hand, the second end 28B, which is the other end in the length direction of the external harness 28, is connected to the connector 29. As shown in FIG. By extending the external harness 28 from the side of the lower traveling body 2 or the front of the earth removing device 19, both the connecting portion for the connector 29 and the connecting portion for the attitude detection sensor 21 can be reached easily. It can be removed and installed with little effort.

The connector 29 serves as a relay point (division point) that detachably connects (connects and splits) the second end 27B of the internal harness 27 and the second end 28B of the external harness 28 . The connector 29 is fixed near an opening 7E formed in the peripheral wall plate 7D of the center frame 7 via a connector bracket 29A. The position near the opening 7E is located below the top plate 7A of the center frame 7 and is protected from the collision of rocks and earth.

The harness device 24 configured in this way can electrically connect between the controller 23 and the slip ring 18</b>C of the center joint 18 by using the controller-side harness 25 . Moreover, the harness device 24 can electrically connect between the slip ring 18C of the center joint 18 and the posture detection sensor 21 by using the sensor-side harness 26 .

In addition, the sensor-side harness 26 detachably connects an internal harness 27 arranged in the accommodation space 7B in the center frame 7 and an external harness 28 arranged outside the center frame 7 by a connector 29 . . In this configuration, the externally located external harness 28 is readily accessible and can be easily replaced.

Next, the operation of leveling work using the earth removing device 19 of the hydraulic excavator 1 will be described.

First, the operator sits on the driver's seat 15 of the upper revolving body 4 and operates the operation lever (not shown) of the earth removing device 19 to bring the lower end of the blade 19B into contact with the ground. In this state, by causing the hydraulic excavator 1 to travel by the operating lever device 17 for traveling, the ground leveling work can be performed. At this time, a total station (not shown) continuously measures the position and height of the blade 19B by tracking the prism 22 attached to the blade 19B. 23. On the other hand, the attitude detection sensor 21 detects the tilt angle of the blade 19B and outputs the tilt angle to the controller 23 via the harness device 24 .

Controller 23 controls a control valve (not shown) for blade 19B based on outputs from total station and attitude detection sensor 21 . Therefore, the earth removing device 19 (elevating cylinder 19C, tilting cylinder 19E) is controlled by the controller 23 so as to follow the three-dimensional data of the ground based on the leveling plan. As a result, in the leveling work, the posture (height position, tilt angle, etc.) of the blade 19B can be changed according to the three-dimensional data of the ground in the leveling plan, and the ground can be leveled so as to conform to the leveling plan (design data). .

Here, during the ground leveling work or excavation work by the hydraulic excavator 1 , the exposed sensor-side harness 26 may collide with rocks, earth and sand, and the sensor-side harness 26 may be damaged. In this case, the sensor-side harness 26 must be replaced.

However, according to this embodiment, the harness device 24 connects the posture detection sensor 21 and the controller 23 via the slip ring 18C of the center joint 18 . The harness device 24 connects the controller side harness 25 provided by connecting between the controller 23 and the slip ring 18C of the center joint 18, and the slip ring 18C of the center joint 18 and the attitude detection sensor 21. and a sensor-side harness 26 provided as a sensor. The sensor-side harness 26 is routed in the accommodation space 7B of the center frame 7 inside the track frame 6, and is routed outside the track frame 6 in addition to the internal harness 27 having the first end 27A connected to the slip ring 18C. and a connector 29 that detachably connects the second end 27B of the internal harness 27 and the second end 28B of the external harness 28 to each other. ing.

Therefore, of the sensor-side harness 26, damage can be limited to the external harness 28 exposed to the outside. Moreover, since the external harness 28 exposed to the outside does not need to be removed from the maintenance cover 7F of the center frame 7 and is easily accessible, it can be easily removed by simply disconnecting it from the connector 29, and can be easily attached. be able to. As a result, the damaged external harness 28 can be easily replaced.

The connector 29 is attached to the track frame 6 via a connector bracket 29A at the position of the opening 7E provided in the peripheral wall plate 7D of the center frame 7 constituting the track frame 6. As shown in FIG. As a result, the connector bracket 29A can fix the connector 29, so that the operator can attach and detach the external harness 28 with one hand, and workability can be improved. In addition, the connector bracket 29A can prevent the connector 29 from colliding with surrounding structures, and the durability of the connector 29 can be improved.

In addition, in the embodiment, the hydraulic excavator 1 including the crawler-type undercarriage 2 has been described as an example of the construction machine. However, the present invention is not limited to this, and can be widely applied to construction machines such as wheel-type hydraulic excavators and hydraulic cranes.

1 Hydraulic excavator (construction machinery)
2 Lower running body 3 Turning device 4 Upper turning body 6 Track frame 7 Center frame 7A Upper plate 7B Storage space 7C Lower plate 7D Peripheral wall plate 7E Opening 10 Turning wheel 18 Center joint 18C Slip ring 19 Unloading device 19B Blade 21 Attitude detection Sensor 23 Controller 24 Harness device 25 Controller-side harness 26 Sensor-side harness 27 Internal harness 27A, 28A First end (one end)
27B, 28B second end (other end)
28 external harness 29 connector

Claims (2)

a self-propellable undercarriage having a track frame;
an upper revolving body rotatably mounted on the track frame via a revolving device;
a center joint having a slip ring arranged at the turning center of the upper revolving body and maintaining an energized state between the lower traveling body and the upper revolving body;
a soil removing device having a proximal end attached to the track frame so as to be rotatable in the vertical direction and a blade provided at the distal end;
an attitude detection sensor provided on the blade for detecting the attitude of the blade;
a controller provided on the upper revolving structure for controlling the operation of the earth removing device based on the attitude of the blade detected by the attitude detection sensor;
and a harness device that connects the attitude detection sensor to the controller,
The harness device connects the attitude detection sensor and the controller via the slip ring of the center joint,
The harness device is
a controller-side harness provided by connecting between the controller and the slip ring of the center joint;
a sensor-side harness provided by connecting between the slip ring of the center joint and the attitude detection sensor;
The sensor-side harness includes an internal harness routed inside the track frame, one end of which is connected to the slip ring, and an external harness routed outside the track frame, one end of which is connected to the attitude detection sensor. A construction machine comprising: a harness; and a connector detachably connecting the other end of the internal harness and the other end of the external harness. The track frame has an upper plate that supports a slewing ring of the slewing device, and an accommodation space that accommodates the center joint is formed between the upper plate and the upper plate that is spaced from the lower side of the upper plate. and a peripheral wall plate provided between the upper plate and the lower plate so as to surround the housing space and having an opening through which the sensor-side harness is inserted on the earth removing device side. consists of
2. The construction machine according to claim 1, wherein the connector is attached to the track frame at the position of the opening of the peripheral wall plate.

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