JP7129388B2 - work vehicle - Google Patents

Description

TECHNICAL FIELD The present invention relates to a work vehicle equipped with a trencher.

Conventionally, as a method of creating a trench having a relatively narrow width with respect to its depth, a method is known in which a trencher is attached to a traveling vehicle for construction or agriculture, and the ground is excavated with the trencher while the traveling vehicle is traveling. there is

More specifically, a work vehicle for creating a ditch includes a trencher that excavates the ground and digs a ditch, and a chute that discharges the earth and sand excavated by the trencher to the side of the ditch (for example, see Patent Document 1). reference).

Japanese Utility Model Laid-Open No. 54-149101

Here, in order to reliably discharge the earth and sand excavated by the trencher to the side of the trench, it is necessary to extend the chute in the width direction of the work vehicle. However, if the chute protrudes to the front of the cab, there is a problem of blocking the operator's field of view.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a working vehicle capable of reliably discharging earth and sand excavated by a trencher without obstructing the field of view of the operator riding in the cab. That's what it is.

In order to achieve the above object, the present invention provides a vehicle body that can travel, a trencher supported by the vehicle body so as to be able to move up and down to excavate the ground to form a groove, and A chute for discharging earth and sand excavated by a trencher to the side of a ditch created by the trencher; The cab is supported by the vehicle body on one side of the trencher in the width direction of the vehicle body, and the chute discharges earth and sand to the other side of the trencher in the width direction , The chute is connected to a side plate arranged on one side of the trencher in the width direction, and connected to the side plate on the upstream side in the direction in which the grooves are formed, so that the earth and sand excavated by the trencher can be transferred to the trencher in the width direction. and a partition plate that partitions between the trencher and the unloaded soil receiving plate in the direction of groove generation, and the unloaded soil receiving plate is positioned between the trencher in the width direction. It is characterized by having a tongue extending from the partition plate to the downstream side in the direction in which the groove is formed, at the tip of the other side and on the other side of the partition plate in the width direction .

According to the present invention, earth and sand excavated by a trencher can be reliably discharged without obstructing the field of view of an operator riding in a cab. Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

1 is a side view of a work vehicle according to this embodiment; FIG. Fig. 2 is a side view of the trencher; Fig. 2 is a perspective view of a chute; FIG. 4 is an enlarged view of a trencher with a chute attached; 1 is a front view of a work vehicle; FIG. 3 is a block diagram of a controller mounted on the work vehicle; FIG.

An embodiment of a work vehicle 1 according to the present invention will be described with reference to the drawings. FIG. 1 is a side view of a work vehicle 1 according to this embodiment. It should be noted that front, rear, left, and right in this specification are based on the viewpoint of an operator who rides and operates the work vehicle 1 unless otherwise specified. That is, the front-rear direction (horizontal direction in FIG. 1) of the work vehicle 1 is defined as the "front-rear direction", and the direction perpendicular to the front-rear direction and parallel to the ground is defined as the "width direction (left-right direction)".

The working vehicle 1 according to the present embodiment is suitably used for digging relatively narrow and deep grooves such as buried grooves for underdrainage pipes or harvesting grooves for deep-rooted roots and leaves. The work vehicle 1 mainly includes a lower running body 2, an upper revolving body 3, and a front working machine 4, as shown in FIG. The lower running body 2 and the upper revolving body 3 constitute the "vehicle body" of the present invention. However, the vehicle body of the present invention does not have to include the upper revolving body 3 .

The lower traveling body 2 is configured to be self-propellable (forward, backward, and turn) while supporting the upper revolving body 3 and the front working machine 4 . The undercarriage 2 has a pair of crawlers 5 . The crawler 5 rotates when the driving force of the engine (not shown) is transmitted and the traveling motor (not shown) rotates. As a result, the lower traveling body 2 travels. However, the undercarriage 2 may be of a wheeled type instead of the crawler 5 .

The upper rotating body 3 is supported by the lower traveling body 2 in a rotatable state. More specifically, the upper rotating body 3 rotates with respect to the lower traveling body 2 when the driving force of the engine is transmitted to rotate a rotating motor (not shown). The upper revolving body 3 includes a revolving frame 6 serving as a base, a cab 7 arranged at the front part of the revolving frame 6 , a counterweight 8 arranged at the rear part of the revolving frame 6 , and a driving force for operating the work vehicle 1 . and an engine that generates A front working machine 4 is arranged in front of the revolving frame 6 .

The front work implement 4 is supported by the revolving frame 6 at the front end of the work vehicle 1 and at the center in the width direction of the work vehicle 1 so as to be vertically movable. The front working machine 4 mainly includes a boom 9, a trencher 10, and a chute 20. - 特許庁The boom 9 is supported by the revolving frame 6 at its base end. Further, the boom 9 is raised and lowered by the extension and contraction of the boom cylinder 9a by transmission of the driving force of the engine. As the boom 9 rises and falls, the trencher 10 moves up and down.

The cab 7 is supported by the revolving frame 6 at the front end of the work vehicle 1 and the left end in the width direction of the work vehicle 1 . That is, the cab 7 is arranged to the left of the trencher 10 in the width direction of the work vehicle 1 . The cab 7 has an internal space in which an operator who operates the work vehicle 1 rides. Inside the cab 7, a seat (not shown) on which an operator sits and an operating device 51 (see FIG. 6) operated by the operator seated on the seat are arranged.

When an operator riding in the cab 7 operates the operation device 51, an operation signal corresponding to the operation is output to the controller 40 (see FIG. 6). As a result, the lower traveling body 2 travels, the upper revolving body 3 revolves, and the front working machine 4 operates. The operation device 51 is composed of, for example, a steering wheel, pedals, levers, switches, and the like.

Details of trencher 10 and chute 20 will now be described with reference to FIGS. FIG. 2 is a side view of the trencher 10. FIG. FIG. 3 is a perspective view of the chute 20. FIG. FIG. 4 is an enlarged view of the trencher 10 with the chute 20 attached. FIG. 5 is a front view of the work vehicle 1. FIG.

The trencher 10 is rotatably supported at the tip of the boom 9 . More specifically, the trencher 10 rotates with respect to the boom 9 when the driving force of the engine is transmitted and the trencher cylinder 10a expands and contracts. The trencher 10 excavates the ground to form a trench T by being driven while in contact with the ground. The trencher 10 mainly includes a frame 11 , a motor 12 , a driving wheel 13 , a driven wheel 14 , a chain 15 , a plurality of digging claws 16 and a plurality of earth removing plates 17 .

The frame 11 includes a base portion 11a connected to the boom 9 and the trencher cylinder 10a, a chain support portion 11b that rotatably supports the chain 15, and a chute support portion to which one ends of support rods 18 and 19 that support the chute 20 are connected. 11c.

The base portion 11a includes a boom connecting portion 11d to which the tip of the boom 9 is rotatably connected, and a rod connecting portion 11e to which the tip of the rod of the trencher cylinder 10a is rotatably connected. The boom connecting portion 11d and the rod connecting portion 11e are provided at the rear end of the base portion 11a. Further, the rod connecting portion 11e is arranged above the boom connecting portion 11d.

The chain support portion 11b is supported by the base portion 11a while extending in the vertical direction. The chain support portion 11b supports the motor 12 and the drive wheels 13 at its upper end, and supports the driven wheels 14 at its lower end. An endless annular chain 15 is wound around the drive wheel 13 and the driven wheel 14 . When the drive wheel 13 is rotated by the driving force of the motor 12, the chain 15 wound around the drive wheel 13 and the driven wheel 14 rotates clockwise in FIG. 2 around the chain support portion 11b. .

The chute support portion 11c has a base end supported by the base portion 11a and extends forward. Also, the chute support portion 11c is arranged between the driving wheel 13 and the driven wheel 14 in the vertical direction. Further, the chute support portion 11c is arranged at a position (on the right side of the chain 15) separated from the chain 15 in the width direction of the work vehicle 1. As shown in FIG.

A plurality of digging claws 16 are attached to the chain 15 at circumferentially spaced positions. The plurality of earth removing plates 17 are attached to the chain 15 at positions spaced apart in the circumferential direction so as to correspond to the plurality of digging claws 16, respectively. The digging claws 16 and the earth removing plates 17 are arranged at equal intervals in the circumferential direction of the chain 15, for example.

The excavating claw 16 is an iron piece that excavates earth and sand as the chain 15 rotates. The earth removal plate 17 is formed in a box shape to hold the earth and sand excavated by the corresponding excavation claws 16 . The unloading plate 17 is open on the downstream side in the rotational direction of the chain 15 and accommodates the digging claws 16 in the internal space.

One end of each of the support rods 18 and 19 is connected to the chute support portion 11c, and the other end is connected to the lower surface of the chute 20 (discharged soil receiving plate 23, which will be described later). That is, the support rods 18 and 19 support the chute 20 with respect to the frame 11 (chute support portion 11c). Moreover, the support rods 18 and 19 are spaced apart in the front-rear direction of the work vehicle 1 . The number of support rods 18 and 19 is not limited to two, and may be one or three or more.

The support rods 18 and 19 according to this embodiment extend obliquely upward toward the chute 20 from the chute support portion 11c. Further, the support rods 18 and 19 are extended in parallel. Further, the support rod 19 is connected to the chute support portion 11 c and the chute 20 in front of the work vehicle 1 from the support rod 18 . Further, the other end of the support rod 19 is connected to the chute 20 at a position farther from the chute support portion 11c than the support rod 18 is.

When the motor 12 is driven while the work vehicle 1 is moving backward, the trencher 10 excavates the ground to form a trench T. More specifically, the digging claw 16 moving upward (that is, the digging claw 16 positioned behind the work vehicle 1 from the chain support portion 11b) excavates earth and sand.

The earth and sand excavated by the excavating claws 16 moves around the chain support portion 11b while being held by the earth removing plate 17, and rotates around the drive wheels 13 (that is, the process of changing the direction of movement from above to below). ) and discharged forward of the work vehicle 1 . The earth and sand discharged forward of the work vehicle 1 are guided to the side of the trench T by the chute 20 .

The chute 20 serves to discharge the earth and sand excavated by the trencher 10 to the side of the trench T created by the trencher 10 . The chute 20 according to this embodiment discharges earth and sand to the right of the trench T. As shown in FIG.

That is, in the width direction of the work vehicle 1, the cab 7 and the chute 20 are arranged on opposite sides of the trencher 10, as shown in FIG. In other words, the cab 7 and the chute 20 do not face each other in the front-rear direction of the work vehicle 1 .

As shown in FIG. 4, the chute 20 is a cover that covers the upper area of the trencher 10 (more specifically around the drive wheels 13). As shown in FIG. 3, the chute 20 mainly includes side plates 21, a roof plate 22, a soil receiving plate 23, and a partition plate 24, for example. The chute 20 may be formed by bending a single plate, or may be formed by joining a plurality of plates.

The side plate 21 is a plate that covers the sides of the trencher 10 (around the drive wheels 13). More specifically, the side plate 21 covers the left side of the trencher 10 . The side plate 21 extends in the front-rear direction and the up-down direction of the work vehicle 1 . The side plate 21 is connected to the upper end of the chain support portion 11b via a sheet screw (not shown) or the like.

That is, the chute 20 is supported on the trencher 10 by the chain support portion 11b and the chute support portion 11c. The support position of the chute 20 by the chain support portion 11b is located above the support position of the chute 20 by the chute support portion 11c. Further, the support position of the chute 20 by the chain support portion 11b and the support position of the chute 20 by the chute support portion 11c are spaced apart in the front-rear direction and width direction of the work vehicle 1 .

The roof plate 22 is a plate that covers the upper ends of the side plates 21 . The roof plate 22 protrudes in the width direction (right direction) of the work vehicle 1 from the upper end of the side plate 21 and extends in the front-rear direction of the work vehicle 1 along the outer edge of the side plate 21 . The roof plate 22 is generally arc-shaped.

The discharged soil receiving plate 23 is connected to the front end of the side plate 21 (upstream side in the direction in which the groove T is formed). The unloading receiving plate 23 plays a role of unloading the earth and sand excavated by the excavating claw 16 to the side (right) of the trench. The discharged soil receiving plate 23 is composed of a receiving portion 25 , a guide portion 26 and a tongue portion 27 .

The receiving portion 25 faces the trencher 10 at the front end of the side plate 21 . That is, the receiving portion 25 protrudes in the width direction (right direction) of the work vehicle 1 from the front end of the side plate 21 and extends vertically along the outer edge of the side plate 21 .

The guide portion 26 is connected to the lower end of the side plate 21 and the lower end of the receiving portion 25 . Further, the guide portion 26 extends from the side plate 21 in the width direction (right direction) of the work vehicle 1 . Furthermore, the guide portion 26 is inclined downward in a direction away from the side plate 21 .

The tongue portion 27 is provided at the tip of the guide portion 26 . Further, the tongue portion 27 extends from the tip of the guide portion 26 to the rear side of the work vehicle 1 (downstream side in the direction in which the groove T is generated). Furthermore, the tongue portion 27 slopes downward toward the rear side of the work vehicle 1 .

The partition plate 24 is arranged between the trencher 10 and the receiving portion 25 in the front-rear direction of the work vehicle 1 . The partition plate 24 protrudes from the side plate 21 in the width direction (right direction) of the work vehicle 1 and extends vertically. That is, the partition plate 24 partitions the trencher 10 and the receiving portion 25 in the front-rear direction of the work vehicle 1 .

A lower end of the partition plate 24 is connected to the guide portion 26 . Furthermore, the partition plate 24 is arranged between the side plate 21 and the tongue portion 27 in the width direction of the work vehicle 1 . In other words, the tongue portion 27 extends from the guide portion 26 to the rear side of the work vehicle 1 at a position farther from the side plate 21 than the partition plate 24 .

The earth and sand discharged forward of the work vehicle 1 from the trencher 10 collides with the receiving portion 25 and is guided downward. Further, the earth and sand that hit the receiving portion 25 and bounce back toward the trencher 10 hit the partition plate 24 and are guided downward. Next, the earth and sand guided downward by the receiving portion 25 and the partition plate 24 are guided to the side (right) of the groove T by the guide portion 26 . The earth and sand on the guide portion 26 are discharged from the chute 20 through the tip of the guide portion 26 and the tongue portion 27 and piled up on the side of the groove T. As shown in FIG.

Further, the work vehicle 1 can measure the depth of the groove T using the laser transmitter 31 and the laser receiver 32 and display the measurement result on the display device 52 (see FIG. 6) inside the cab 7 . In this embodiment, an example in which the laser transmitter 31 is installed outside the work vehicle 1 and the laser light receiver 32 is mounted on the work vehicle 1 will be described. However, the installation positions of the laser transmitter 31 and the laser receiver 32 may be reversed.

As shown in FIGS. 1 and 5, the laser transmitter 31 is supported by a tripod placed on the ground in front of the work vehicle 1 and on the side of the groove T already created. More specifically, the laser transmitter 31 is installed at a position facing the cab 7 in the front-rear direction of the work vehicle 1 . The laser transmitter 31 transmits laser light toward the bottom surface of the groove T. As shown in FIG.

The laser light receiving device 32 is mounted on the work vehicle 1 . The laser light receiving device 32 is desirably arranged on the opposite side of the chute 20 across the trencher 10 in the width direction of the work vehicle 1 (that is, on the left side of the trencher 10). More specifically, the laser receiver 32 may be attached to the side surface of the cab 7 as shown in FIG. 1, or may be attached to the front surface of the cab 7 as shown in FIG.

The laser light receiving device 32 receives laser light emitted from the laser transmitter 31 and reflected by the bottom surface of the groove T. As shown in FIG. Then, the laser light receiving device 32 determines the arrival time of the laser light (elapsed time from when the laser light is transmitted by the laser transmitting device 31 until the laser light is received), and the light receiving angle of the laser light (the angle between the incident direction of the laser light and the horizontal direction). angle), etc., and outputs a detection signal indicating the detection result to the controller 40 (see FIG. 6).

FIG. 6 is a block diagram of the controller 40 mounted on the work vehicle 1. As shown in FIG. The controller 40 includes a CPU (Central Processing Unit) 41 , a ROM (Read Only Memory) 42 and a RAM (Random Access Memory) 43 . The controller 40 realizes processing described later by the CPU 41 reading and executing program codes stored in the ROM 42 . The RAM 43 is used as a work area when the CPU 41 executes programs.

However, the specific configuration of the controller 40 is not limited to this, and may be realized by hardware such as ASIC (Application Specific Integrated Circuit) and FPGA (Field-Programmable Gate Array).

Controller 40 calculates the depth of groove T based on the detection signal output from laser light receiving device 32 . Then, the controller 40 displays the calculated depth of the groove T on the display device (display) 52 installed in the cab 7 . When excavating a trench T for burying drainage pipes, it is necessary to give the trench T a slope. Therefore, the operator operates the operation device 51 while viewing the depth of the groove T displayed on the display device 52 .

The controller 40 drives the actuators (travel motor, swing motor, boom cylinder 9a, trencher cylinder 10a, and motor 12) 53 based on the operation signal output from the operation device 51. FIG. More specifically, the controller 40 operates an electromagnetic valve installed in an oil passage between the hydraulic pump and the hydraulic actuator and supplies electric current to the electric motor. As a result, grooves T having a predetermined gradient are generated.

According to the above embodiment, for example, the following operational effects are obtained.

If the cab 7 and the chute 20' face each other in the front-rear direction of the work vehicle 1, as indicated by the dashed line in FIG. Therefore, by arranging the cab 7 and the chute 20 on opposite sides of the trencher 10 in the width direction of the work vehicle 1 as in the above-described embodiment, the operator's field of vision can be ensured.

By arranging the cab 7 and the chute 20 on opposite sides in the width direction as in the above embodiment, the chute 20 blocks the optical path of the laser light between the laser transmitter 31 and the laser receiver 32. can be prevented.

Further, by arranging the cab 7 and the chute 20 on opposite sides in the width direction as in the above-described embodiment, the amount of protrusion of the chute 20 in the width direction (right direction) can be increased. As a result, the earth and sand excavated by the trencher 10 can be reliably discharged to the side of the trench T. That is, it is possible to prevent the earth and sand discharged by the chute 20 from returning to the trench T.

Further, according to the above-described embodiment, since the tongue portion 27 extending downstream in the direction in which the groove T is generated is provided at the tip of the guide portion 26, earth and sand can be discharged to the region where the groove T has not yet been formed. can be done. As a result, the earth and sand discharged by the chute 20 can be prevented from returning to the trench T more effectively.

On the other hand, if the amount of overhang of the chute 20 is increased, the vibration of the chute 20 when the work vehicle 1 is driven increases. Therefore, according to the above-described embodiment, the chute 20 is supported by the frame 11 by the support rods 18 and 19 in addition to the side plate 21, so that the chute 20 is properly supported against the vibrations propagated from the work vehicle 1. can do. Further, by arranging the support rods 18 and 19 apart in the front-rear direction of the work vehicle 1, the chute 20 can be supported more appropriately.

In the above embodiment, the cab 7 is arranged on the left side of the trencher 10, and the chute 20 discharges earth and sand on the right side of the trencher 10. As shown in FIG. However, the positional relationship between the cab 7 and the chute 20 is not limited to the above example, and the left and right may be reversed. That is, the cab 7 may be supported by the upper revolving body 3 on one side of the trencher 10 in the width direction of the work vehicle 1 . Also, the chute 20 may discharge earth and sand to the other side of the trencher 10 in the width direction of the work vehicle 1 .

Further, in the above-described embodiment, an example in which the trencher 10 and the chute 20 are attached to the vehicle body including the lower running body 2 and the upper revolving body 3 has been described. As a result, the trencher 10 and the chute 20 can be attached by removing the arm and bucket of the existing hydraulic excavator. However, a specific example of the vehicle body to which the trencher 10 and the chute 20 are attached is not limited to a hydraulic excavator, and may be a tractor or the like.

The above-described embodiments are illustrative examples of the present invention and are not intended to limit the scope of the present invention only to those embodiments. Those skilled in the art can implement the invention in various other forms without departing from the spirit of the invention.

REFERENCE SIGNS LIST 1 work vehicle 2 undercarriage 3 upper rotating body 4 front working machine 5 crawler 6 rotating frame 7 cab 8 counterweight 9 boom 9a boom cylinder 10 trencher 10a trencher cylinder 11 frame 11a base 11b chain support 11c chute support 11d boom connection Part 11e Rod connecting part 12 Motor 13 Drive wheel 14 Driven wheel 15 Chain 16 Excavation nail 17 Discharge plate 18, 19 Support rod 20, 20' Chute 21 Side plate 22 Roof plate 23 Discharge receiving plate 24 Partition plate 25 Receiving part 26 Guide part 27 Tongue part 31 Laser transmitting device 32 Laser receiving device 40 Controller 41 CPU
42 ROMs
43 RAM
51 operating device 52 display device 53 actuator

Claims (4)

a drivable vehicle body;
a trencher that is vertically supported by the vehicle body and excavates the ground to form a trench;
a chute supported by the trencher for discharging earth and sand excavated by the trencher to the side of the ditch created by the trencher;
A work vehicle comprising an operation device for operating the vehicle body and the trencher, and a cab supported by the vehicle body,
The cab is supported by the vehicle body on one side of the trencher in the width direction of the vehicle body,
The chute discharges earth and sand to the other side of the trencher in the width direction ,
The chute is
a side plate arranged on one side of the trencher in the width direction;
a soil receiving plate that is connected to the side plate on the upstream side in the groove generation direction and that discharges the earth and sand excavated by the trencher to the other side of the trencher in the width direction;
a partition plate that separates the trencher and the soil receiving plate in the groove generation direction,
The unloaded soil receiving plate has a tongue portion extending from the partition plate to the downstream side in the groove generation direction at the tip of the other side of the trencher in the width direction and on the other side of the partition plate in the width direction. A work vehicle characterized by: In the work vehicle according to claim 1,
A work vehicle, wherein the cab is equipped with a laser receiving device for receiving laser light emitted from a laser emitting device in order to measure the depth of the trench created by the trencher. In the work vehicle according to claim 1,
The trencher is
a frame supported by a boom extending upward with respect to the vehicle body;
an endless ring-shaped chain that rotates while being supported by the frame;
a plurality of digging claws attached at circumferentially spaced positions on the chain;
The work vehicle, wherein the chute is supported by the frame by a support rod having one end connected to the frame and the other end connected to the lower surface of the chute. In the work vehicle according to claim 3,
The work vehicle, wherein the chute is supported by the frame by a plurality of the support rods spaced apart in the front-rear direction of the work vehicle.

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