JP6481578B2 - Work vehicle - Google Patents

Description

  The present invention relates to a work vehicle that performs fertilization work.

  Conventionally, as an example of a work vehicle that performs fertilization work, a seedling transplanter that includes a fertilizer concentration sensor that detects a fertilizer concentration and a control device that adjusts the fertilizer application amount according to the detection result of the fertilizer concentration sensor is known. It has been.

  In such a seedling transplanter, the control device and the fertilizer concentration sensor provided on the left and right traveling wheels are connected by a communication cable, but the communication cable is configured by connecting a plurality of cables in order to improve maintainability. (For example, see Patent Document 1).

JP2012-055212A

  However, the configuration of the above-described conventional communication cable has room for further improvement in terms of improving maintainability, such as the need for bolts / nuts and collars for connecting terminals together.

  This invention is made in view of the above, Comprising: It aims at providing the work vehicle which can improve the maintainability of the communication cable which connects a fertilizer concentration sensor and a control apparatus.

In order to solve the above-described problems and achieve the object, the invention according to claim 1 is a traveling vehicle body (2) having left and right traveling wheels (10), and traveling that transmits driving force to the traveling wheels (10). A transmission case (13), a fertilizer concentration sensor (700) attached to the traveling wheel (10) and capable of detecting a fertilizer concentration in a field, a fertilizer application device (100) provided in the traveling vehicle body (2), A fertilizer adjustment device (400) that adjusts the fertilizer application amount of the fertilizer application device (100), and a control device (210) that controls the operation of the fertilizer adjustment device (400) based on the detection result of the fertilizer concentration sensor (700). ), And a cable that transmits the detection result of the fertilizer concentration sensor (700) to the control device (210), the first cable (730) disposed inside the traveling transmission case (13), The traveling transmission case A second communication cable having a cable (740) which is disposed outside of the 13) (750), a support plate for supporting said second cable (740) and (71), formed on said support plate (71) The plate-side mounting plate (71a) and the case-side mounting surface (13g) formed in a planar shape on the top of the traveling transmission case (13) so as to be connected to the plate-side mounting plate (71a). The first connection terminal (706) formed and attached to the end of the first cable (730) and the second connection terminal (707) attached to the end of the second cable (740) are respectively inserted. The connection hole (735) to be connected with one touch in the state of being attached, and the tip end are in contact with the plate side mounting plate (71a), and at least the second cable (740) Protective pipe covering the (703), and a work vehicle, characterized in that to obtain Bei a.

The invention according to claim 2 is a drawing marker that extends upward from the traveling wheel (10) toward the outside of the traveling vehicle body (2), and forms a progress reference line as a measure of the traveling position in a field scene. (16) is provided with a marker support frame (165), and the drawing marker support frame (165) is formed with a frame bent portion (166) curved in a convex shape downward, and A pipe bending portion (705) that is curved in a convex shape toward the outside of the traveling vehicle body (2) is formed above the traveling wheel (10) of the protective pipe (703). From the upper side of the wheel (10) to the back side of the traveling wheel (10), a linear body guide route (G) for guiding a predetermined linear body (R) to the inside of the body of the traveling wheel (10) is formed. and work vehicle according to claim 1, characterized in that It was.

In the invention of claim 3, the fertilizer concentration sensor (700) is formed such that ends of the plurality of arcuate members (700a), (700a) are connected to each other via a conductive connector (700d). The work vehicle according to claim 1 or 2 , wherein the work vehicle is formed and attached to the traveling wheel (10) via the connector (700d).

According to a fourth aspect of the present invention, there is provided a third cable (760) for connecting the first cable (730) and the fertilizer concentration sensor (700) disposed in the traveling transmission case (13), and the third cable. From the attachment position of the third connection terminal (770) provided at the base of the cable (760) and connected to the fertilizer concentration sensor (700), and the third connection terminal (770) in the traveling wheel (10), over a traveling transmission case (13), one of claims 1, characterized in that it comprises a third said cable (760) third connecting terminal (770) and the covering protective member (800), the third It was set as the work vehicle of 1 item.

The invention of claim 5 includes a third cable (760) connecting the first cable (730) and the fertilizer concentration sensor (700) disposed in the traveling transmission case (13), and the third cable. cable provided at the base of the (760), a third connection terminal connected to the fertilizer concentration sensor (700) (770), before Symbol third least partially surround the terminal protective wall of the connecting terminals (770) (781) When was the working vehicle according to claim 1, characterized in that it comprises a.

  According to the first aspect of the present invention, since the first connection terminal (706) and the second connection terminal (707) can be connected with one touch, the first cable of the communication cable (750) can be easily obtained during maintenance work. (730) and the second cable (740) can be disconnected, and the efficiency of attaching and detaching the traveling wheel (10) and the traveling transmission case (13) is improved. Moreover, it can prevent as much as possible that the 1st cable (730) and the 2nd cable (740) are disconnected at the time of a maintenance, and durability of a communication cable (750) improves. Further, since the first connection terminal (706) and the second connection terminal (707) can be directly connected, for example, other parts such as screws, nuts, and collars are unnecessary, and the number of parts is reduced and maintenance is performed. The disassembly and assembly work becomes easier.

Moreover , since the tip of the protective pipe (703) is in contact with the plate-side mounting plate (71a), water and mud can be prevented from entering the connection hole (735), so the traveling transmission case (13) is disassembled. This eliminates the need to remove the accumulated water and mud, improving the maintainability. Moreover, since it can prevent as much as possible that the fertilizer density | concentration transmitted to a control apparatus (210) from a fertilizer density | concentration sensor (700) to the control apparatus (210) by the influence of the infiltrated water and mud soil, a fertilizer amount adjusting device It is possible to optimize the amount of fertilization by switching (400). Further, the outer peripheral surface of the communication cable (750) is covered with a protective pipe (703) and supported by the support plate (71), so that the communication cable (750) comes into contact with the traveling wheel (10) and is damaged. Since this can be prevented as much as possible, the durability is improved, and an appropriate amount of fertilizer based on the detection result of the fertilizer concentration sensor (700) can be supplied to the field, and the growth of the crop can be improved.

According to the second aspect of the present invention, in addition to the effect of the first aspect of the invention, for example, when the work vehicle is loaded on the transport vehicle, the frame bent portion (formed on the drawing marker support frame (165)) ( 166) and the rod body guide path (G) having the pipe bent portion (705) formed in the protective pipe (703), the rope (R) for restraining the traveling vehicle body (2) is connected to the traveling wheel (10). Since it is smoothly guided to the inner side of the machine body, the rope (R) is prevented from moving to the inner side of the machine body, and the efficiency of the rope hanging work is increased. Moreover, since it can prevent as much as possible that a rope (R) presses a protection pipe (703) and disconnects an internal communication cable (750), a fertilizer concentration sensor (700) may become unusable. It is prevented, and appropriate fertilization work according to the fertilizer concentration in the field becomes possible.

According to the invention of claim 3 , in addition to the effect of claim 1 or 2 , for example, when a part of the fertilizer concentration sensor (700) is broken, the arcuate member (700a) including the broken portion is replaced. Therefore, the durability of the fertilizer concentration sensor (700) can be improved.

According to the invention of claim 4 , in addition to the effect of the invention of any one of claims 1 to 3 , the fertilizer concentration sensor (700) and the third cable (via the third connection terminal (770)) 760), the communication cable (750) can be removed when the traveling wheel (10) and the fertilizer concentration sensor (700) are removed. Therefore, it is possible to prevent the communication cable (750) from being disconnected as much as possible during the maintenance work. In addition, water and mud contact between the fertilizer concentration sensor (700) and the third cable (760) by the protective member (800) covering the third cable (760) and the third connection terminal (770). Can be prevented as much as possible, so that the fertilizer concentration transmitted from the fertilizer concentration sensor (700) to the control device (210) can be prevented from being different from the actual value as much as possible. It is possible to optimize the amount of fertilization by switching.

According to the invention of claim 5 , in addition to the effect of the invention of any one of claims 1 to 3 , the terminal protective wall (781) receives pressure to contact mud, so that the third connection terminal (770) Can be prevented from being damaged.

FIG. 1 is a side view showing a seedling transplanter as a work vehicle. FIG. 2 is a plan view showing the seedling transplanter. FIG. 3 is an explanatory diagram of the front wheels. FIG. 4 is an explanatory diagram of an electrode plate of a fertilizer concentration sensor. FIG. 5 is an explanatory diagram of the rear wheel. FIG. 6 is an explanatory view showing the front wheel final case and the detection unit of the suspension mechanism. FIG. 7 is a schematic front view showing a fertilization transmission mechanism between the fertilizer application and the rear wheel gear case. FIG. 8 is an explanatory view of the feeding portion of the fertilizer application as viewed in cross section. FIG. 9 is an explanatory view of the fertilizer application in plan view. FIG. 10 is a front view in which a part of the seedling transplanter is omitted. FIG. 11 is a block diagram centering on the controller. FIG. 12A is an explanatory diagram showing a state of arrangement of the communication cable. FIG. 12B is an explanatory diagram of the support plate. FIG. 13 is an explanatory diagram illustrating an arrangement state according to a comparative example of the communication cable. FIG. 14 is an explanatory diagram of a striatum guide route. FIG. 15A is an explanatory diagram illustrating a protective member that covers the third cable and the third connection terminal. FIG. 15B is an explanatory diagram illustrating a configuration of the protection member. FIG. 15C is an explanatory diagram illustrating an arrangement state of the third cable. FIG. 16A is a perspective view illustrating an example of a terminal protection wall. FIG. 16B is an explanatory diagram showing the above-described terminal protection wall in a cross-sectional view.

  Hereinafter, a work vehicle according to an embodiment of the present invention will be described in detail with reference to the drawings. In the following description, the work vehicle is a riding seedling transplanter equipped with a fertilizer application device. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art, or substantially the same, so-called equivalent ranges. Furthermore, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.

  1 is a side view showing a seedling transplanting machine as a work vehicle according to the embodiment, FIG. 2 is a plan view showing the seedling transplanting machine, FIG. 3 is an explanatory diagram of a front wheel, and FIG. 4 is a fertilizer concentration sensor. FIG. 5 is an explanatory view of the electrode plate, and FIG. 5 is an explanatory view of the rear wheel. In the following, the seedling transplanting machine is assumed to be eight-row planting, and the seedling transplanting machine may be referred to as the body. In the embodiment, when the front-rear and left-right directions are defined, the traveling direction of the traveling vehicle body 2 as viewed from the driver seat 31 is used as a reference.

  As shown in FIGS. 1 and 2, the seedling transplanter has a seedling planting unit 4 mounted on the rear side of the traveling vehicle body 2 so as to be movable up and down via a lifting link mechanism 3. A body portion of the device 100 is provided. The seedling planting unit 4 is an example of a working device, and may be any work vehicle that has a fertilizer concentration sensor 700 as illustrated and can perform fertilization work. For example, the work vehicle may be provided with a seeding device for supplying seeds or a tilling rotary for plowing a field as a work device.

  The traveling vehicle body 2 is a four-wheel drive vehicle including a pair of left and right front wheels 10 and a pair of left and right rear wheels 11 as driving wheels. A mission case 12 is arranged at the front of the aircraft, and a front wheel final case 13 as a traveling transmission case is provided on the left and right sides of the mission case 12. The front wheels 10 are respectively attached to the left and right front axles 10a projecting outward from the left and right front wheel final cases 13 respectively. In FIG. 1, reference numeral 10b denotes an axle cover.

  As shown in FIG. 3, the front wheel 10 has 36 central lugs 10C formed at every 10 degrees on the left and right central portions of its outer peripheral edge, while 18 left lugs 10L and right The lugs 10R are respectively arranged every 20 degrees. The left lug 10L and the right lug 10R are arranged so as not to be adjacent to each other on the left and right sides of the central lug 10C. As a result, the left lug 10L and the right lug 10R scrape the soil alternately while scraping the soil with the central lug 10C, so that the ground contact area of the front wheel 10 is reduced, mud is less likely to adhere, and the front wheel 10 is separated from the mud. It is difficult to prevent the running performance from being lowered.

  Moreover, as shown to Fig.3 (a), the fertilizer density | concentration sensor 700 is provided in each of the front wheels 10 on either side. The fertilizer concentration sensor 700 detects the fertilizer concentration between the left and right front wheels 10 and is constituted by an annular electrode plate. When electricity is passed through the fertilizer concentration sensor 700, the electrical resistance changes depending on the fertilizer concentration contained in the soil between the left and right of the front wheels 10 or in the water, so that the change in electrical resistance is described later as a fertilizer concentration signal at that point. 210 (FIG. 11). The electrical resistance is low because the electricity is easy to flow when the fertilizer concentration is high, that is, the amount of the electrolyte is high, and is high because the electricity is difficult to flow when the fertilizer concentration is low, that is, when the amount of the electrolyte is low. As shown in the figure, the fertilizer concentration sensor 700 is disposed on the inner side or the outer side of the front wheel 10 and in the vicinity of the outer peripheral edge near the soil or water, but is provided not on the front wheel 10 but on the left and right rear wheels 11. Also good.

  As shown in FIG. 4, the fertilizer concentration sensor 700 in the present embodiment is formed in an annular shape by connecting the ends of a plurality of arc-shaped members 700a and 700a via a connecting tool 700d having conductivity. Here, as shown in FIG. 3, the three arc-shaped members 700a are connected in the circumferential direction, and are attached to the front wheel 10 via a connecting tool 700d using, for example, bolts and nuts. The connecting tool 700d used in the present embodiment shares the one for connecting the spoke 700c to the front wheel 10. Therefore, the arc-shaped member 700a can be connected in an annular shape without increasing the number of parts.

  Further, the annular electrode plate constituting the fertilizer concentration sensor 700 can be divided and assembled into a plurality of arc-shaped members 700a, 700a, so that, for example, when a portion of the fertilizer concentration sensor 700 is damaged, the fertilizer concentration sensor There is no need to replace the entire 700, and the arcuate member 700a including the damaged portion may be replaced. Therefore, the durability of the fertilizer concentration sensor 700 as a whole is improved. In addition, as in the present embodiment, if the arc-shaped member 700a has a substantially fan shape, more arc-shaped members 700a can be obtained from a metal plate having a certain size, so that the cost of the fertilizer concentration sensor 700 can be reduced. be able to.

  Returning to FIG. 1 and FIG. 2, the description will be continued. The front end portion of the main frame 15 is fixed to the rear portion of the transmission case 12, and rear wheel gear cases 18L and 18R are provided on the left and right sides of the rear portion of the main frame 15, and the rear wheel gear case 18 (18L, 18L, 18R), the rear wheels 11 are respectively attached to the left and right rear axles 18a projecting outward.

  As shown in FIG. 5, the rear wheel 11 is provided with 11 sets of three rear wheel lugs 11a on the outer peripheral edge, and the rear wheel 11 and the rear wheel lug 11a are provided between the sets of the rear wheel lugs 11a. A total of 11 wide lugs 11b wider than the left and right widths are provided. Further, the rear wheel 11 has a larger diameter than the front wheel 10.

  As a result, when the rear wheel 11 rotates, the wide lug 11b having a large ground contact area contacts the ground every time the rear wheel 11 rotates by a predetermined angle, so that a propulsive force that does not lose the resistance of the ground can be obtained.

  The front wheel 10 and the rear wheel 11 are solid tires formed by coating a metal wheel with rubber or synthetic resin or enclosing rubber or synthetic resin instead of air, and are configured not to be punctured. Alternatively, a metal tire in which a rim and a lug are integrally formed of metal or a combination of a plurality of metal parts may be used. The durability is greatly improved by using a metal for the entire tire.

  In addition, when working in a field such as a wet field where solid tires tend to sink in the soil and it is difficult to obtain a propulsive force, a tube tire with a tube that encloses air may be used. By using wide tube tires on the left and right, widening the ground contact area and obtaining buoyancy due to air, subsidence is suppressed, and deterioration in running performance is prevented.

  As shown in FIGS. 1 and 2, the engine 20 is mounted on the main frame 15. The rotational power of the engine 20 is transmitted to the transmission case 12 via a belt transmission 21 and a hydraulic continuously variable transmission 23 called HST (Hydro Static Transmission). The rotational power transmitted to the mission case 12 is shifted by the transmission in the mission case 12, and then separated into traveling power and external power to be extracted.

  FIG. 6 is an explanatory diagram showing detection parts of the front wheel final case 13 and the suspension mechanism 14. As shown in the drawing, the left and right front wheel final cases 13 are composed of an upper case 13a and a lower case 13b that is pivotable in the left-right direction around the upper case 13a and is slidable up and down. The front wheel 10 is rotatably mounted on the outer side of the lower case 13b.

  Inside the upper case 13a and the lower case 13b, a king pin 13c transmitted to the front wheel 10 is disposed so as to be rotatable and slidable up and down. A suspension spring 13d is provided on the outer periphery of the king pin 13c and between the upper case 13a and the lower case 13b to push the lower case 13b downward. The king pin 13c is arranged in an inclined posture toward the outside of the machine body.

  The suspension spring 13d constitutes the suspension mechanism 14, and expands and contracts to move the lower case 13b up and down when the front wheel 10 passes over an obstacle such as unevenness on the ground or a stone. In this way, the front side of the traveling vehicle body 2 moves up and down greatly, so that the working device such as the seedling planting portion 4 attached to the rear portion of the traveling vehicle body 2 is greatly separated from the farm scene or too close to the farm scene. To prevent. In addition, when the suspension mechanism 14 functions, the axle center of the rear wheel 11 becomes a rotation fulcrum.

  Since the king pin 13c slides up and down when the suspension mechanism 14 functions, a stroke sensor 14a is provided above the king pin 13c. The stroke sensor 14a can detect more accurate expansion and contraction as the position is closer to the center of the kingpin 13c, but the kingpin 13c is rotating. In view of this, the upper end shaft 13e of the king pin 13c is attached to a bearing (not shown) of a counter plate 14b provided in the upper part of the upper case 13a so as to be movable up and down. Thus, the stroke sensor 14a can detect the amount of expansion / contraction via the counter plate 14b. With this configuration, the expansion / contraction detection accuracy of the stroke sensor 14a when the suspension mechanism 14 is operated is improved.

  Further, the external take-out power that is separated from the rotational power transmitted to the mission case 12 is transmitted to a planting clutch case 25 provided at the rear portion of the traveling vehicle body 2. Then, it is transmitted from the planting clutch case 25 to the seedling planting unit 4 by the planting transmission shaft 26.

  As shown in FIGS. 1 and 2, the upper part of the engine 20 is covered with an engine cover 30, and a driver's seat 31 is installed thereon. A bonnet 32 having various operation mechanisms is provided in front of the driver's seat 31, and a steering handle 34 for steering the front wheels 10 is provided above the bonnet 32. The engine 20 is generally a gasoline engine or a diesel engine, but a gas turbine or the like may be used. A side clutch pedal 96 for turning on and off the left and right side clutch mechanisms (not shown) is provided at the lower part of the hood 32 and at the front lower part of the control seat 31.

  In addition, the bonnet 32 is provided with a sub-transmission switching lever 900 that switches between “working speed” when working on the power transmission of the traveling vehicle body 2 in the field and “moving speed” when moving on the road. . Further, a GPS receiving antenna (hereinafter, simply referred to as a receiving antenna) 710 constituting a GPS (Global Positioning System) control device 120 is mounted on the upper left and right center of the bonnet 32. A reception signal of the reception antenna 710 is sent to the controller 210 (see FIG. 11).

  The controller 210 is a control device that controls the operation and the like of the fertilizer application device 100 and is housed inside the hood 32. The controller 210 includes, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory). By executing a program stored in the ROM, each unit of the seedling transplanter is configured. Control.

  A fuel tank 33 for storing fuel is provided below the controller 210, on the front side of the main frame 15 and on the rear side of the bumper 15a. The fuel tank 33 stores fuel corresponding to the engine 20, for example, gasoline, light oil and the like.

  A substantially horizontal floor step 35 is formed on both the left and right sides of the lower portion of the engine cover 30 and the hood 32. As shown in FIG. 2, the floor step 35 is partly in a lattice shape, and mud on the shoe of the worker walking on the floor step 35 falls on the field.

  The raising / lowering link mechanism 3 which raises / lowers the seedling planting part 4 connected to the rear part of the traveling vehicle body 2 has a parallel link configuration, and includes one upper link 40 and a pair of left and right lower links 41, 41. The upper link 40 and the lower links 41, 41 are pivotally attached to a link base frame 42 having a rear-view portal shape whose base side is erected at the rear end portion of the main frame 15, and a vertical link 43 on the front end side. Are connected. And the connecting shaft 44 rotatably supported by the seedling planting part 4 is inserted and connected to the lower end part of the vertical link 43, and the seedling planting part 4 is connected so as to be able to roll around the connecting shaft 44.

  A lifting hydraulic cylinder 46 is provided between a cylinder support member (not shown) provided on the main frame 15 and a tip of a swing arm (not shown) integrally formed with the upper link 40. By extending and lowering the lifting / lowering hydraulic cylinder 46 by hydraulic pressure, the upper link 40 rotates up and down, and the seedling planting part 4 moves up and down while maintaining a substantially constant posture.

  As described above, the seedling planting unit 4 has an eight-row planting configuration, and includes a planting transmission case 50 that also serves as a frame, a seedling mount 51, a planting device 52, and the like. The seedling platform 51 carries mat seedlings (not shown) and reciprocates left and right to supply seedlings one by one to the seedling outlet 51a (see FIG. 2) for each line, and all seedlings for one horizontal row are seedlings. When supplied to the take-out port 51a, the seedling is transferred downward by the seedling feeding belt 51b. The planting device 52 plants the seedling supplied to the seedling outlet 51a on the field using the seedling planting tool 52a. Note that two seedling planting tools 52a are provided per one line, and are attached to a rotating case so that seedlings can be alternately taken and planted in a field.

  A center center float 55, left and right side floats 56, and an outer float 57 outside the body of the left and right side floats 56 are rotatably provided below the seedling planting unit 4. When the aircraft is advanced with these floats 55, 56, 57 in contact with the mud surface of the field, the floats 55, 56, 57 slide while leveling the mud surface, and seedlings are planted by the planting device 52 on the ground level. Is planted.

  The center float 55 is provided with a float sensor 58 that detects the amount of rotation of the center float 55 due to a change in the field depth (see FIG. 11). When the float sensor 58 detects a change in angle, the controller 210 determines that the depth of the field has changed, and moves up and down so that the height of the seedling planting unit 4 becomes an appropriate height according to the detected angle. The hydraulic cylinder 46 is expanded and contracted to automatically adjust the working height of the seedling planting unit 4.

  The detection value of the float sensor 58 is set to 0 degrees when the center float 55 comes into contact with the farm scene in a substantially horizontal posture. When the detected value is in the elevation direction (upward), the controller 210 determines that the depth of the field has become shallow and that the interval between the seedling planting unit 4 and the field scene has become narrow, and the lifting hydraulic cylinder 46 is contracted. The seedling planting part 4 is raised to prevent the seedling planting depth from becoming too deep. On the other hand, when the detected value is in the depression direction (downward), the controller 210 determines that the field depth has increased and the distance between the seedling planting unit 4 and the field scene has increased, and the lifting hydraulic cylinder 46 is extended. Then, the seedling planting part 4 is lowered to prevent the seedling planting depth from becoming too shallow.

  In addition, as shown in FIG. 1, a leveling rotor 27 for leveling the unevenness of the field scene is provided at the bottom of the seedling planting unit 4 in order to stabilize the seedling planting depth. The leveling rotor 27 is rotated by receiving a driving force from a rotor transmission shaft 28 disposed on the inner side of the rear wheel gear case 18L on the left and right sides of the body and on the upper side of the body with respect to the rear axle 18a. Even in fields with hard soil, it is possible to level the unevenness.

  Here, the fertilizer application apparatus 100 is demonstrated. FIG. 7 is a schematic front view showing a fertilization transmission mechanism between the fertilizer applying apparatus 100 and the rear wheel gear case 18R, FIG. 8 is an explanatory view of the feeding portion of the fertilizer applying apparatus 100 in cross-sectional view, and FIG. It is explanatory drawing by vision. As shown in FIGS. 1, 2, and 7 to 9, the fertilizer application device 100 includes a fertilizer hopper separated by a left gap between the left fertilizer hopper 60 </ b> L and the right fertilizer hopper 60 </ b> R, and a feeding unit 61. The fertilization hose 62, the fertilization guide 63, and the air duct 68 are provided.

  Each of the left and right fertilizer hoppers 60L and 60R is shared by four strips, and an openable / closable lid 60a is attached to the upper part. The lower portions of the left and right fertilizer hoppers 60L and 60R are branched into the number of fertilization strips (four strips) to form a funnel-shaped flow lower portion 60b. The lower portion of the flow lower portion 60b is connected to the upper end of each feeding portion 61. Is done. Also, a frame-shaped shutter case 80 is provided on each strip between the lower part of the flow part 60b and the feeding part 61, and is formed in a shutter hole formed in the front and rear of the shutter case 80 that is long in the left-right direction and short in the vertical direction. A plate-shaped fertilization shutter 81 is slidably provided.

  The left end portion of the air duct 68 through which the conveying air for moving the fertilizer to the fertilizer hose 62 passes is connected to a blower 67 driven by a blower electric motor 66 through an air switching pipe (not shown). And when the air from the blower 67 passes the discharge port 61a of the delivery part 61 from the connection pipe via the air duct 68, it is set as the structure which is blown in the fertilizer hose 62 side, entraining a fertilizer.

  The granular fertilizer stored in the fertilizer hoppers 60L, 60R is fed out by a fixed amount by the feeding unit 61 provided for each seedling planting strip. The fed fertilizer is guided to the fertilization guides 63 attached to the left and right sides of the center float 55, the side float 56 and the outer float 57 by the fertilization hose 62. And by the groove production body 64 provided in the front side of the fertilization guide 63, it can drop into the fertilization groove formed in the side part vicinity of a seedling planting strip.

  As shown in FIG. 8, the feeding unit 61 includes, for example, two first feeding rolls 73 </ b> A and second feeding rolls 73 </ b> B that feed downward the fertilizer stored in the right manure hopper 60 </ b> R (or the left manure hopper 60 </ b> L). ing. The first and second feeding rolls 73A and 73B are rotating bodies each having a groove-like recess 74 formed on the outer peripheral portion thereof, and a rectangular shaft portion 75a of a common feeding shaft 75 provided in the left-right direction (in the illustrated example, a square shaft). Are fitted in a structure that rotates integrally with each other.

  Then, the first feed roll 73A and the second feed roll 73B rotate in the direction of the arrow in FIG. 8 so that the fertilizer dropped and supplied from the left-side fertilizer hopper 60L (or the right-side fertilizer hopper 60R) is accommodated in the recess 74. Then it is drawn downward. The fertilizer fed by the first feeding roll 73A and the second feeding roll 73B is discharged from the discharge port 61a at the lower end. A connecting pipe (not shown) is connected to the discharge port 61a of the feeding portion 61 with a front end portion inserted and connected to the back surface portion of the air duct 68 in the front-rear direction and a rear end portion communicating with the discharge port 61a of the feeding portion 61. The

  Further, as shown in FIG. 8, a brush 76 slidably in contact with the outer peripheral surfaces of the first feeding roll 73A and the second feeding roll 73B on the side (front side) where the recess 74 moves downward is attached to and detached from the feeding portion 61. It is provided freely. By this brush 76, the fertilizer is housed in the recessed portions 74 of the first feeding roll 73A and the second feeding roll 73B, and the amount of fertilizer fed by the first feeding roll 73A and the second feeding roll 73B is kept constant.

  And as shown in FIG. 7, the relay rod 463 which changes the transmission direction of a driving force from the fertilization transmission drive rod 462 to the body front-back direction is arrange | positioned in the left-right direction. In addition, a connecting plate 464 is disposed between the fertilization transmission drive rod 462 and the relay rod 463 so that the front and rear ends swing in the vertical direction with the connection fulcrum pin 464a as a fulcrum in conjunction with the vertical movement of the fertilization transmission drive rod 462. At the same time, the fertilization transmission mechanism 300 is configured by disposing a sub drive rod 465 that transmits a driving force to a feeding rotation arm 467 (FIG. 9), which will be described later, at the other end of the relay rod 463.

  Similarly, as shown in FIG. 7, a fertilization amount adjusting motor 400 that rotates at high speed in a forward and reverse direction is disposed as a fertilization amount adjusting device below the left and right central portion of the left fertilizer hopper 60 </ b> L. As shown in FIG. 9, the fertilization amount adjusting motor 400 is arranged at a rear left side of the engine cover 30 that covers the periphery of the engine 20. The power of the fertilizing amount adjusting motor 400 is transmitted through the fertilizing transmission mechanism 300 and the fertilizing amount fed from the feeding unit 61 can be adjusted.

  As described above, the fertilizer application amount adjustment motor 400 is disposed below the left and right direction central portion of the left fertilizer hopper 60L, so that the fertilizer application amount adjustment motor 400 can supply the fertilizer to the left and right fertilizer hoppers 60L and 60R. Therefore, the work efficiency is improved. Moreover, since the rotation of the left and right fertilizer hoppers 60L and 60R in the front-rear direction is not restricted, the left and right fertilizer hoppers 60L and 60R are tilted rearward when the fertilizer is discharged, and the remaining fertilizer is quickly discharged. Is not hindered.

  Further, on the inner side of the rear wheel gear case 18R and on the front side of the rear axle 18a, the fertilization transmission output shaft 461 that transmits to the fertilization transmission mechanism 300 of the fertilizer application 100, and the transmission to the fertilization transmission output shaft 461. A fertilization clutch mechanism 460 for turning on and off is provided.

  By transmitting to the fertilizer transmission mechanism 300 from the fertilizer transmission output shaft 461 provided on the rear wheel gear case 18R, the fertilizer application device 100 can be operated using the driving force to the rear wheel 11, so that transmission to the fertilizer application device 100 is performed. There is no need to configure the route separately, and the number of parts can be reduced and the structure can be simplified.

  By the way, as shown in FIG. 9, the fertilizer application amount adjustment motor 400 is covered with a motor case 400a, and the upper end surface of the motor case 400a is positioned below the machine body with respect to the fertilizer shutter 81, so It is arranged near the central portion in the left-right direction of 60R. Specifically, it shall be arranged in the space formed between the left and right of the second and third feeding parts 61 and 61 and the flow parts 60b and 60b counting from the right end of the machine body. Further, the fertilizer application amount adjusting motor 400 is provided with a ball screw 420 rotatably, and a ball nut 430 that is screwed into a spiral groove formed on the surface of the ball screw 420 and moves in the longitudinal direction of the machine at high speed. Yes. Then, a feeding rotation pin 469 is provided on the ball nut 430.

  Further, the feeding rotation pin 469 is arranged closer to the upper side of the machine body than the central portion in the vertical direction of the ball nut 430, and is offset from the ball screw 420 in a side view and is positioned above the ball screw 420.

  With this configuration, the fertilizer application amount adjustment motor 400 does not hinder the opening / closing operation of the fertilizer shutter 81, and therefore, when the fertilizer shutter 81 is operated in accordance with the working state, work such as attachment / detachment of parts is not required, thus improving work efficiency. To do.

  Further, as shown in FIG. 9, a discharge duct 79 for moving the fertilizer discharged from the discharge passage to the discharge port 79a on the side of the machine body is disposed in the left-right direction at the lower rear portions of the left and right fertilizer hoppers 60L and 60R. The One end of the discharge duct 79 is connected to a blower 67. When the operation switching lever described above is operated to the fertilizer application side, the conveyance air is blown into the air duct 68, and when operated to the discharge side, the conveyance air is blown into the discharge duct 79. It is.

  With this configuration, when the operation switching lever is operated to the discharge side to open the switching shutter of each strip, the fertilizer moves to the discharge duct 79 through each discharge passage, and the fertilizer is discharged into the discharge port 79a by the conveying air blown into the discharge duct 79. It is transported to and discharged. In addition, although a bag or bucket for collection is allowed to face the discharge port 79a, in order to suppress the spread of the fertilizer blown out, if a fine mesh discharge hose is provided, the dispersion of the fertilizer is prevented, Increased fertilizer recovery.

  In the configuration of the fertilizer application 100 described above, for example, a shim (not shown) is previously sandwiched in a portion where wear tends to progress with time, such as a fulcrum member 420a (FIG. 9) that supports the ball screw 420. If the shim wears, it may be replaced with a new one. In this way, it is possible to efficiently prevent backlash by inflicting the wear of parts on a shim that can be easily replaced, and it is possible to prevent the amount of fertilizer from being supplied as set, and the crop grows stably. .

  As shown in FIGS. 1 and 2, a pair of left and right spare seedling frames 38 on which a replenishing seedling is placed are provided on the left and right sides of the front portion of the traveling vehicle body 2. A material conveying device 600 that rotates independently from the preliminary seedling frame 38 is provided below the right side seedling frame 38. The material conveying device 600 can load work materials such as fertilizer bags from the outside of the machine and move them to the traveling vehicle body 2 side, and can be provided not only on the right side but also on the left side or both sides.

  FIG. 10 is a front view in which a part of the seedling transplanter is omitted. As shown in FIG. 10, the material conveyance device 600 includes a first rotation arm 601 that is rotatably provided on the seedling frame 38 a and a second rotation arm 602 that is rotatably provided on the first rotation arm 601. And a material mounting table 603 that is rotatably provided at the end of the second rotating arm 602.

  When using the material conveyance device 600, if the first rotation arm 601 and the second rotation arm 602 are rotated and protruded to the front side of the machine body, the material mounting table 603 protrudes to the front side of the machine body from the traveling vehicle body 2. Therefore, work materials such as fertilizer bags can be easily placed from outside the field. When the first rotation arm 601 is rotated toward the rear side of the machine body in this state, the material placing table 603 projects in an arc shape to the side of the machine body and moves to above the traveling vehicle body 2. At this time, since the material mounting table 603 approaches the left and right fertilizer hoppers 60L and 60R and the upper portion of the seedling planting unit 4, when the fertilizer or seedling is replenished, the worker moves with the fertilizer bag or the seedling. The distance is shortened, the labor of the worker is reduced, and the work efficiency is improved.

  On the other hand, when storing the material conveying apparatus 600, while rotating the 1st rotation arm 601 toward the body back, the 2nd rotation arm 602 is rotated toward the body front side. Thereby, since the material mounting table 603 is positioned below the spare seedling frame 38, the material conveying device 600 is prevented from projecting to the outside of the machine body or the front side of the machine during storage or the like, and the material conveying apparatus 600 is brought into contact with the surroundings. Is prevented from being damaged.

  When the material conveying device 600 is provided on one side of the left and right sides, an auxiliary mounting table 610 on which work materials and seedlings are loaded can be provided at the lower part of the spare seedling frame 38 on the opposite side (see FIG. 1). In the present embodiment, an auxiliary mounting table 610 is provided below the left side seedling frame 38. In FIG. 10, what is indicated by reference numeral 605 is a rotation restricting body that restricts the rotation of the material conveyance device 600.

  Further, as shown in FIGS. 1 and 2, the left and right lines that form guide lines that serve as a guide for straight advancement in the field on the front left and right sides of the traveling vehicle body 2 and on the rear side of the machine body from the left and right spare seedling frames 38 Each pull marker 16 is provided. The left and right drawing markers 16 are composed of a water wheel marker 16a that contacts the farm field, a guide rod 16b for mounting the water wheel marker 16a, and a marker rotation motor 16c that rotates the guide rod 16b outward and inward of the machine body. .

  The left and right drawing markers 16 are controlled so that one side of the left and right sides is lowered during the planting operation and the left and right other sides are retracted upward when turning, and one side is retracted upward and the left and right other sides are working when turning. The configuration. When turning or not planting, both the left and right drawing markers 16 are retracted upward. By aligning the center mascot 17 provided at the front end of the traveling vehicle body 2 and in the center of the left and right with the guide line formed by the left and right drawing markers 16, it is possible to perform planting work along the previous work position. , Work efficiency and planting accuracy improve.

  Depending on the soil quality of the field, the guide line formed by the left and right drawing markers 16 may be buried immediately, and the standard of straight travel may disappear. At this time, the left and right side markers 19 provided on the rear side of the aircraft with respect to the left and right drawing markers 16 are moved toward the outside of the aircraft, and the side markers 19 are positioned above the planted seedlings. Planting work that matches the planting of seedlings becomes possible.

  Next, the control system of the seedling transplanter will be described. FIG. 11 is a block diagram centering on the controller 210. The controller 210 includes a processing unit having a CPU (Central Processing Unit), a storage unit such as a ROM (Read Only Memory) and a RAM (Random Access Memory), and an input / output unit, which are connected to each other. Signals can be exchanged with each other. The storage unit stores a computer program for controlling the seedling transplanter. For example, the controller 210 can automatically adjust the fertilizer application amount based on the fertilizer concentration in the field acquired by the fertilizer concentration sensor 700.

  As shown in the figure, the controller 210 is connected to actuators such as a motor and sensors for acquiring information on each part. For example, the controller 210 operates, as actuators, a fertilization amount adjustment motor 400 for adjusting the fertilization amount and a throttle (not shown) for adjusting the intake amount of the engine 20 to increase or decrease the rotational speed of the engine 20. A throttle motor 201 for actuating the drawing marker 16, a drive motor 870 for driving the leveling rotor 27, a lifting motor 804 for raising and lowering the leveling rotor 27, and a lifting hydraulic cylinder 46 for raising and lowering the seedling planting part 4 Connected.

  Sensors connected to the controller 210 include a fertilizer concentration sensor 700, a rear wheel rotation sensor 23, a float sensor 58, a depth sensor 720, a temperature sensor 790, a tilt sensor 830, and the like provided on the left and right front wheels 10, respectively. Connected.

  As described above, the fertilizer concentration sensor 700 is constituted by the electrode plates provided on the left and right front wheels 10 and 10, and detects the fertilizer concentration in the field. The rear wheel rotation sensor 23 measures the depth of the field for detecting the vehicle speed of the traveling vehicle body 2 by detecting the rotation speed of the rear wheel 11. The float sensor 58 detects the rotation amount of the center float 55.

  The depth sensor 720 is composed of an ultrasonic sensor that measures the depth to the water surface or the soil surface by reflection of ultrasonic waves. As shown in FIGS. 1 and 2, the depth sensor 720 is provided with left and right seedling frame frames 38a that support the left and right spare seedling frames 38, respectively, and mounting arms 721 that project to the front side of the machine body. It is attached to the front end of 721. Since the depth sensor 720 detects a reflected wave from the farm water surface, the higher the water surface, the shorter the reflection time, and the controller 210 determines that the depth is “deep”. However, since the distance between the water surface and the depth sensor 720 fluctuates due to the influence of waves and the like, in order to eliminate the influence as much as possible, here, 20 detected values are obtained every 0.01 second. The maximum value and the next largest value, and the minimum value and the next smallest value are discarded, and the average of the remaining 16 detection values is used to detect the depth.

  Further, the detection result of the depth sensor 720 normally uses the average of the detection values of the left and right depth sensors 720 and 720 in order to prevent bias. However, for example, one of the left and right depth sensors 720 and 720 is in an abnormal state in which one of the sensors is short-circuited, mud adheres to a cable or the like, or is pinched by another member of the cable (such as a seedling frame 38a). Sometimes. In that case, one of them outputs an obviously abnormal value or zero detection, so that the difference from the actual value becomes large if the left and right averages are taken. Therefore, in the seedling transplanter according to the present embodiment, sensing is performed using only the other depth sensor 720 that is not in an abnormal state.

  For example, when abnormality of both depth sensors 720 and 720 is detected, it is good to stop the automatic control of the fertilizing amount and return the fertilizing amount to the reference amount. Here, the reference amount is a reference value for switching the fertilizer application amount, for example, a value calculated by teaching work, a value input from the information storage terminal 130 described later, an initial value input to the controller 210, or the like. Use it. Here, the reference value is used when both depth sensors 720 and 720 are in an abnormal state. However, when one of the depth sensors 720 and 720 is in an abnormal state, only the other sensing is performed. It is good also as using.

  Incidentally, the abnormality detection of the depth sensor 720 can be performed by the controller 210 analyzing and determining the output result. In addition, if the depth of the field cannot be measured, the fertilizer amount cannot be properly controlled, and the controller 210 uses, for example, a buzzer or a monitor when determining an abnormality in the depth sensor 720 in order to promote early maintenance. It is preferable that the operator is informed of the abnormality.

  The seedling transplanter includes a GPS control device 120 and an information storage terminal 130 such as a tablet terminal that are connected to the controller 210, respectively.

  The GPS control device 120 can acquire the position information or coordinate information of the seedling transplanter on the earth by using the GPS, and the position information acquired by the GPS control device 120 can be transmitted to the controller 210. . The GPS control device 120 has a receiving antenna 710 that receives a signal from an artificial satellite used in the GPS in order to acquire the position information of the seedling transplanter by using the GPS as described above (see FIGS. 1 and 2). reference).

  The information storage terminal 130 includes a display unit that displays information, an input operation unit that performs various input operations, and a storage unit that stores information. Among these, a display part and an input operation part may be comprised separately, and may be comprised integrally by the touchscreen type display. The information storage terminal 130 may be configured to be detachably attachable near the control seat 31 of the traveling vehicle body 2, for example.

  The storage unit of the information storage terminal 130 stores the position information of one or a plurality of farm fields and the spot information of a predetermined location derived from the position information at the previous work on the farm field, and is acquired by the GPS control device 120. The latest position information can be stored via the controller 210.

  As described above, the seedling transplanter according to the present embodiment has a fertilizer concentration sensor 700 for detecting the fertilizer concentration between the left and right front wheels 10 on the left and right front wheels 10 (see FIGS. 1, 3, 4, and 11). ) Are provided. Then, based on the fertilizer concentration between the left and right front wheels 10 detected by the fertilizer concentration sensor 700, the controller 210 of the seedling transplanter determines the amount of fertilizer to be supplied to the field, and the determined fixed amount of fertilizer is supplied. Thus, the rotation of the fertilizer application amount adjusting motor 400 can be controlled.

  The detection result of the fertilizer concentration sensor 700 is transmitted to the controller 210 via the communication cable 750. In this embodiment, the configuration of the communication cable 750 and its support structure are characteristic. FIG. 12A is an explanatory view showing an arrangement state of the communication cable 750, and FIG. 12B is an explanatory view of a support plate.

  As shown in FIG. 12A, the lower case 13b of the front wheel final case 13 includes a traveling case 13ba in which a kingpin 13c and a bevel gear 13f for rotating the front axle 10a are installed, and a communication cable for transmitting the fertilizer concentration detected by the fertilizer concentration sensor 700. The detection case 13bb includes a slip ring 701 for connecting the 750. The front axle 10a penetrates the traveling case 13ba and the detection case 13bb and protrudes to the outside of the machine body, and the front wheel 10 to which the fertilizer concentration sensor 700 is attached is provided on the protruding portion.

  The communication cable 750 connected to the fertilizer concentration sensor 700 is taken out from the inside of the front wheel 10 to the outside of the fuselage, bent inside an axle cover 10b provided at the center of the front wheel 10 outside the fuselage, and slipped along the front axle 10a. 701 is connected.

  The detection value is transmitted from the slip ring 701 to the controller 210 via the first cable 730 attached to the detection case 13bb constituting a part of the front wheel final case 13. The communication cable 750 is configured by connecting a plurality of cables including the first cable 730. In the present embodiment, at least a first cable 730 disposed inside the front wheel final case 13, a second cable 740 disposed outside the front wheel final case 13, the first cable 730 and the fertilizer concentration sensor 700. And a third cable 760 for connecting the two.

  The plurality of cables are connected by a coupler 704 provided in the axle cover 10b and in the detection case 13bb, so that the harness can be easily removed when attachment / detachment such as maintenance is necessary. In such a configuration, as shown in the figure, the first cable 730 and the second cable 740 can be directly attached / detached using a gypsum terminal, in other words, can be connected with one touch.

  That is, the first connection terminal 706 attached to the end of the first cable 730 and the second connection terminal 707 attached to the end of the second cable 740 can be directly attached and detached, and can be connected with one touch. ing. Therefore, in particular, the first cable 730 and the second cable 740 can be connected or disassembled without a tool, so that the maintenance work efficiency is improved. In addition, if it is the structure which can be connected by one touch in this way, it is not necessary to limit to a bullet terminal.

  FIG. 13 is an explanatory diagram illustrating an arrangement state according to a comparative example of the communication cable. In addition, the same code | symbol is attached | subjected to the component same as the structure which concerns on this embodiment shown in FIG. 12A, and description is abbreviate | omitted. As shown in the drawing, conventionally, a bolt 7004, a nut 7002, a round terminal 7003, a resin collar 7001, and the like have been provided to connect the terminals of the communication cable 750 to each other.

  In this respect, in the present embodiment, the first connection terminal 706 and the second connection terminal 707 can be directly connected, and thus the above-described components such as the bolt 7004, the nut 7002, the round terminal 7003, and the resin collar 7001 are not necessary. The number of parts is reduced, and the disassembly and assembly work at the time of maintenance becomes easy. In addition, since the first connection terminal 706 and the second connection terminal 706 can be connected with one touch, the connection between the first cable 730 and the second cable 740 can be easily released during maintenance work. The efficiency of attaching / detaching the front wheel final case 13 is improved. Furthermore, since the possibility that the first cable 730 and the second cable 740 are disconnected during maintenance can be prevented as much as possible, the durability of the communication cable 750 can be improved.

  Further, the seedling transplanter according to the present embodiment is provided with a support plate 71 that supports the communication cable 750. Here, the support plate 71 is configured to support the second cable 740 extending from the front wheel final case 13 to the outside.

That is, as shown in FIGS. 12A and 12B, the seedling transplanter according to the present embodiment includes a support plate 71 that supports the second cable 740. The support plate 71 has a plate-side mounting plate 71a formed in a rectangular plane at the bottom, and extends obliquely upward from both ends of the plate-side mounting plate 71a, with a predetermined interval between the tip portions. It is composed of elongated upright plates 71b and 71b provided with support portions 71c formed by being opened.

  As shown in FIG. 12B, the support portion 71c formed between the front end portions of the upright plate 71b is cut at the front end of the upright plate 71b at an angle, and the support edges longer than the width of the elongated upright plate 71b are first. 2 cables 740 can be clamped.

On the other hand, the top of the front wheel final casing 13 corresponding to the plate-side mounting plate 71a, the case-side mounting surface 13g is formed on the surface so as to be connected to the plate-side mounting plate 71a. Then, connection holes 735 are formed in the plate-side mounting plate 71a and the case-side mounting surface 13g so that the first connection terminals 706 and the second connection terminals 707 are connected to each other with the first connection terminals 706 and the second connection terminals 707 inserted therethrough.

Further, the second cable 740 is covered with a protective pipe 703, and the protective pipe 703 is disposed so that the tip thereof is in contact with the plate-side mounting plate 71a.

Thus, since the tip of the protective pipe 703 contacts the plate-side mounting plate 71a, water and mud can be prevented from entering the connection hole 735. This eliminates the need for disassembling the front wheel final case 13 and removing the accumulated water and mud, improving the maintainability.

  In addition, since the fertilizer concentration transmitted from the fertilizer concentration sensor 700 to the controller 210 can be prevented as much as possible from being affected by the invaded water and mud, it is possible to switch the fertilizer adjustment motor 400. It is possible to optimize the amount of fertilizer applied.

  Furthermore, by covering the outer peripheral surface of the second cable 740 constituting the communication cable 750 with the protective pipe 703 and supporting it with the support plate 71, the second cable 740 can be in contact with the front wheel 10 and damaged. As a result, the durability can be improved, and an appropriate amount of fertilizer based on the detection result of the fertilizer concentration sensor 700 can be supplied to the field, so that the growth of the crop can be improved.

  By the way, the seedling transplanter may be loaded on a loading platform of a transport vehicle such as a truck and transferred. In that case, it is common to restrain the seedling transplanter on the bed using a striated body such as a rope or a wire, but at that time, the striated body is attached to the front wheel 10 or the rear wheel 11 of the traveling vehicle body 2. Often hangs inside. At that time, if it is a case where it is passed over the front wheel 10, the wire body may strongly press the communication cable 750, and the communication cable 750 may be disconnected. This is the same even when the communication cable 750 is covered with the protective pipe 703.

  Therefore, in the present embodiment, a linear body guide path G is formed that guides a linear body (here, referred to as a rope R) to the inside of the body of the front wheel 10 from above the front wheel 10 to the back side of the front wheel 10. . FIG. 14 is an explanatory diagram of the striatum guide route G. In FIG. 14, reference numeral 708 denotes a terminal connection portion that shows a simplified state in which the first connection terminal 706 and the second connection terminal 707 are connected.

  That is, in the seedling transplanter according to the present embodiment, the left and right drawing markers 16 that form traveling reference lines (guide lines) that serve as a guide for the traveling position and straight travel are provided on the left and right sides of the traveling vehicle body 2 on the field. (See FIGS. 1 and 2). As shown in FIG. 14, the drawing marker support frame 165 that supports the drawing marker 16 extends upward from the front wheels 10 toward the outside of the traveling vehicle body 2.

  A frame bent portion 166 is formed in the drawing marker support frame 165 so as to be curved downwardly. On the other hand, a pipe bending portion 705 that is curved in a convex shape toward the outside of the traveling vehicle body 2 is formed above the front wheel 10 in the protective pipe 703. In this way, when the rope R is advanced from the upper side of the front wheel 10 to the inside of the machine body, the rope R smoothly moves along the striate body guide path G from the upper side of the front wheel 10 to the inside of the machine body.

  Thus, the rope R hung from the upper side of the front wheel 10 is first guided obliquely downward by the frame bent portion 166, and is guided not to the upper side of the communication cable 750 but to the lower side by the presence of the pipe bent portion 705. Become. Accordingly, the rope R is smoothly guided to the side surface of the front wheel 10 and the efficiency of the rope hanging work is increased.

  Moreover, since the rope R can prevent the internal communication cable 750 (second cable 740) from being disconnected as much as possible by pressing the protective pipe 703, it is possible to prevent the fertilizer concentration sensor 700 from being disabled. Therefore, it is possible to perform appropriate fertilization work in accordance with the fertilizer concentration in the field.

  The configuration of the communication cable 750 and the support structure thereof will be described with reference to FIGS. 12A and 15A to 15C. 15A is an explanatory view showing a protective member that covers the third cable 760 and the third connection terminal 770, FIG. 15B is an explanatory view showing a configuration of the protective member, and FIG. 15C is an arrangement state of the third cable 760. It is explanatory drawing shown.

  As shown in FIG. 12A, the communication cable 750 includes a third cable 760 that connects the first cable 730 and the fertilizer concentration sensor 700 disposed in the front wheel final case 13. A third connection terminal 770 connected to the fertilizer concentration sensor 700 is attached to the base of the third cable 760.

  In such a configuration, as shown in FIG. 15A, a protective member 800 is provided to cover the third cable 760 and the third connection terminal 770 from the attachment position of the third connection terminal 770 on the front wheel 10 to the front wheel final case 13. It has been. That is, the third cable 760 is disposed in the vicinity of the predetermined spoke 700c, and the third cable 760 is covered by the protective member 800.

  As shown in FIG. 15B, the protection member 800 includes a mud cover 810 that is formed of a metal plate and covers the third cable 760, and a terminal cover 820 that is formed of an insulator such as rubber or synthetic resin. Although both have substantially the same shape, the terminal cover 820 is formed in a short length. As shown in the figure, the third connection terminal 770 connected to the fertilizer concentration sensor 700 is covered with a terminal cover 820, and a mud-proof cover 810 is coupled thereon. In connection, the screws 780 and the like (see FIG. 15A) are inserted and connected to the connection holes 800c formed in the mud cover 810, the terminal cover 820, and the wheel cover 700e of the front wheel 10, respectively.

  Further, the protective member 800 is formed with a cable arrangement portion 800 a that can contain the third cable 760. That is, a cable arrangement portion 800 a that is curved outwardly is formed at each central portion of the mud cover 810 and the terminal cover 820. Therefore, the protective member 800 can cover the third cable 760 in a state of being in close contact with the fertilizer concentration sensor 700 from the foil cover 700e.

  Thus, since the fertilizer concentration sensor 700 and the third cable 760 are connected via the third connection terminal 770, for example, when removing the front wheel 10 or the fertilizer concentration sensor 700, the communication cable 750 is disconnected. be able to. Therefore, it is possible to prevent the communication cable 750 from being disconnected during the maintenance work as much as possible.

  Further, the protective member 800 that covers the third cable 760 and the third connection terminal 770 can prevent water and mud from coming into contact between the fertilizer concentration sensor 700 and the third cable 760 as much as possible. Therefore, the fertilizer concentration transmitted from the fertilizer concentration sensor 700 to the controller 210 can be prevented as much as possible from the actual value, and the fertilization amount can be optimized by switching the fertilization amount adjustment motor 400. it can.

  At this time, an electric wire passage 800b for passing the third cable 760 can be formed in the wheel cover 700e. By winding the third cable 760 in the electric wire passage 800b, the third cable 760 can be reliably protected in cooperation with the protection member 800. Further, since the position of the third cable 760 can be fixed, it is possible to prevent disconnection. In addition, in this embodiment, although both the protection member 800 and the electric wire channel | path 800b are employ | adopted, it is good also as employ | adopting either one.

  Here, another embodiment for protecting the third connection terminal 770 will be described. FIG. 16A is a perspective view illustrating an example of a terminal protection wall, and FIG. 16B is an explanatory diagram illustrating the terminal protection wall in a cross-sectional view. As shown in the figure, a terminal protection wall 781 surrounding at least a part of the third connection terminal 770 is provided.

  That is, the terminal protection wall 781 is formed by the wall body cut and raised from the arc-shaped member 700a (fertilizer concentration sensor 700) at a predetermined height so as to sandwich the cable connection hole 761 formed in the arc-shaped member 700a constituting the electrode plate. Has been. Reference numeral 782 denotes a hole left in the arcuate member 700a which is an electrode plate after the terminal protection wall 781 is cut and raised.

  Thus, since the terminal protective wall 781 is provided in the circumferential direction of the front wheel 10 so as to face each other with the third connection terminal 770 interposed therebetween, the terminal protective wall 781 receives pressure from water, mud, or the like. The third connection terminal 770 does not receive pressure directly. Therefore, it is possible to effectively prevent the third connection terminal 770 from being damaged.

  Here, since the terminal protective wall 781 is formed by cutting and raising from the electrode plate (arc-shaped member 700a) constituting the fertilizer concentration sensor 700, the number of parts does not increase, but the protective piece formed by another member May be disposed so as to surround the third connection terminal 770. In this case, the degree of freedom in designing the size and shape of the terminal protection wall 781 is increased.

  As described above, the communication cable 750 and each terminal are protected so that the concentration detection by the fertilizer concentration sensor 700 can be normally performed. However, for example, when a disconnection or a short circuit occurs, automatic fertilization control is performed. It is good to stop and to return the fertilization amount adjustment motor 400 to the position where normal fertilization without reducing fertilizer is performed, and to perform fertilization work with the normal fertilization amount.

  In this case, as in the case where the depth sensor 720 is in an abnormal state, when an abnormality of the fertilizer concentration sensor 700 is detected, the operator is notified of the abnormality by a buzzer or the like. desirable.

  Here, the configuration of the front wheel final case 13 will be further described with reference to FIG. 12A. As shown in the drawing, the lower part of the king pin 13c and the bevel gear 13f require a lubricant such as grease or oil to prevent wear and seizure due to rotation. A member that needs to be sealed in large quantities and to prevent wear and seizure is immersed in a lubricant. However, if the lubricant is in contact with the slip ring 701 or the communication cable 750, the lubricant may affect the conductivity, and an accurate fertilizer concentration may not be transmitted to the controller 210.

  Therefore, the lower case 13b is composed of the traveling case 13ba and the detection case 13bb separately, and the front axle 10a is mounted via the seal bearing 10d, so that the traveling case 13ba is filled with lubricant, and the detection case 13bb In the configuration, no lubricant enters. A seal bearing 10d is also provided at a position where the front axle 10a penetrates the outer side of the body of the detection case 13bb to prevent water and mud in the field from entering the detection case 13bb from the front axle 10a.

  With this configuration, the detection value of the fertilizer concentration sensor 700 can be transmitted accurately while preventing the kingpin 13c and the bevel gear 13f from being worn and seized, so that the amount of fertilizer applied can be accurately calculated while preventing a decrease in durability. Is possible.

  Further, by covering the end portion of the front axle 10a from which the communication cable 750 protrudes outside the vehicle body with the axle cover 10b, it is possible to prevent water and mud from entering the connection portion by the coupler 704 of the communication cable 750. The detection value of the sensor 700 is transmitted accurately, and the fertilizer application amount can be accurately calculated.

  Further, an O-ring 10e is disposed between the flange portion 10f and the inner mounting plate 10g inside the connecting portion between the flange portion 10f and the axle cover 10b for attaching the front wheel 10 to the front axle 10a. . Thereby, it is possible to prevent muddy water from entering the inside of the front wheel 10 and to improve the assemblability during maintenance.

  The depth sensor 720 can measure the depth to the water surface or the soil surface by reflection of ultrasonic waves or laser light. As shown in FIG. 1 and FIG. The seedling frame 38a is provided with mounting arms 721 that project to the front side of the machine body, and are attached to the front ends of the left and right mounting arms 721. Since the depth sensor 720 detects a reflected wave from the farm water surface, the higher the water surface, the shorter the reflection time, and the controller 210 determines that the depth is “deep”. However, since the distance between the water surface and the depth sensor 720 fluctuates due to the influence of waves and the like, in order to eliminate the influence as much as possible, here, 20 detected values are obtained every 0.01 second. The maximum value and the next largest value, and the minimum value and the next smallest value are discarded, and the average of the remaining 16 detection values is used to detect the depth.

  From the embodiment described above, the following work vehicle (seedling transplanter) can be realized.

  (1) A traveling vehicle body 2 that includes left and right front wheels 10, a front wheel final case 13 that transmits driving force to the front wheels 10, a fertilizer concentration sensor 700 that is attached to the front wheels 10 and that can detect a fertilizer concentration in a field, and a traveling vehicle body 2, a fertilizer adjustment motor 400 that adjusts the fertilizer amount of the fertilizer apparatus 100, a controller 210 that controls the operation of the fertilizer adjustment motor 400 based on the detection result of the fertilizer concentration sensor 700, and fertilizer A communication cable 750 that transmits the detection result of the concentration sensor 700 to the controller 210, and the communication cable 750 is disposed outside the front wheel final case 13 and the first cable 730 disposed inside the front wheel final case 13. A first connection terminal 706 attached to the end of the first cable 730, A work vehicle and a second connection terminal 707 attached to the end portion of the cable 740 are configured to be connected by one touch.

(2) In the above (1), the support plate 71 that supports the second cable 740, the connection hole 735 that is connected to each other in a state where the first connection terminal 706 and the second connection terminal 707 are inserted, and a protective pipe 703 which covers at least the second cable 740, the connecting hole 735, and the plate-side mounting plate 71a formed in a planar support plate 71, so that it can be connected to the plate-side mounting plate 71a, A work vehicle which is formed on a case-side mounting surface 13g formed in a planar shape on the top of the front wheel final case 13, and the protective pipe 703 is disposed so that the tip abuts against the plate-side mounting plate 71a.

  (3) In the above (2), the line drawing that extends above the front wheel 10 toward the outside of the traveling vehicle body 2 and supports the line drawing marker 16 that forms a progress reference line in the field scene as a guide for the traveling position. The marker support frame 165 is provided with a frame bending portion 166 that is curved downwardly and is formed on the drawing marker support frame 165, and travels above the front wheel 10 of the protective pipe 703. A pipe-bending portion 705 is formed that is curved in a convex shape toward the outside of the vehicle body 2, and a linear body guide that guides the rope R to the inside of the body of the front wheel 10 from above the front wheel 10 to the back side of the front wheel 10. A work vehicle in which a route G is formed.

  (4) In any one of the above (1) to (3), the fertilizer concentration sensor 700 is formed in such a manner that the ends of the plurality of arc-shaped members 700a and 700a are connected to each other via a conductive connecting device 700d. A work vehicle that is formed and is attached to the front wheel 10 via the connector 700d.

  (5) In any one of the above (1) to (4), the third cable 760 that connects the first cable 730 disposed in the front wheel final case 13 and the fertilizer concentration sensor 700, and the third cable 760 The third cable 760 and the third connection terminal 770 are provided from the attachment position of the third connection terminal 770 provided on the base and connected to the fertilizer concentration sensor 700 and the third connection terminal 770 in the front wheel 10 to the front wheel final case 13. A work vehicle provided with a protective member 800 that covers.

(6) In any one of the above (1) to (4), the third cable 760 that connects the first cable 730 disposed in the front wheel final case 13 and the fertilizer concentration sensor 700, and the third cable 760 A work vehicle provided with a third connection terminal 770 provided at a base and connected to the fertilizer concentration sensor 700, and a terminal protection wall 781 surrounding at least a part of the third connection terminal 770.

  The embodiment described above is merely an example, and is not intended to limit the scope of the invention. The embodiment can be implemented in various other forms, and various omissions, replacements, combinations, and changes can be made without departing from the scope of the invention. In addition, specifications (structure, type, direction, shape, size, length, width, thickness, height, number, arrangement, position, material, etc.) of each configuration, shape, display element, etc. are changed as appropriate. Can be implemented.

2 Traveling body 4 Seedling planting part (ground work device)
10 Front wheels (traveling wheels)
13 Front wheel final case (driving transmission case)
14 Suspension mechanism 14a Stroke sensor (Expansion / contraction amount detection member)
34a Handle potentiometer (steering detection member)
55 Center float (grounding member)
58 Float sensor (rotation detection member)
97 Clutch cylinder (actuating member)
100 Fertilizer 210 Controller (Control device)
400 Fertilizer adjustment motor (fertilizer adjustment device)
700 Fertilizer concentration sensor 720 Depth sensor (depth detection member)

Claims (5)

A traveling vehicle body with left and right traveling wheels;
A traveling transmission case for transmitting driving force to the traveling wheels;
A fertilizer concentration sensor mounted on the traveling wheel and capable of detecting a fertilizer concentration in a field;
A fertilizing device provided on the traveling vehicle body;
A fertilizer amount adjusting device for adjusting the fertilizer amount of the fertilizer,
Based on the detection result of the fertilizer concentration sensor, a control device for controlling the operation of the fertilizer application amount adjusting device,
A cable for transmitting a detection result of the fertilizer concentration sensor to the control device; a first cable disposed inside the traveling transmission case; and a second cable disposed outside the traveling transmission case; A communication cable having
A support plate for supporting the second cable;
The first cable is formed on a plate-side mounting plate formed on the support plate and a case-side mounting surface formed on the top of the traveling transmission case so as to be connected to the plate-side mounting plate. A first connection terminal attached to the end of the second connection terminal and a second connection terminal attached to the end of the second cable, respectively, and a connection hole to be connected with one touch in a state of being inserted,
A protection pipe that is disposed so that a tip abuts against the plate-side mounting plate and covers at least the second cable;
A work vehicle, characterized in that to obtain Bei a. A drawing marker support frame that extends above the traveling wheel toward the outside of the traveling vehicle body and supports a drawing marker that forms a progress reference line that is a measure of the traveling position in a farm scene,
The drawing marker support frame is formed with a frame bent portion that is curved in a convex shape toward the lower side, and is directed outward of the traveling vehicle body above the traveling wheel of the protective pipe. And a bent pipe portion that is curved in a convex shape is formed,
2. The work vehicle according to claim 1 , wherein a striated guide route is provided to guide a predetermined striated body to the inner side of the body of the traveling wheel from above the traveling wheel to the back side of the traveling wheel. . The fertilizer concentration sensor
The ends of the plurality of arcuate members are connected to each other through a conductive connector and formed into an annular shape, and are attached to the traveling wheel through the connector. Or the working vehicle of 2 . A third cable connecting the first cable and the fertilizer concentration sensor disposed in the traveling transmission case;
A third connection terminal provided at a base of the third cable and connected to the fertilizer concentration sensor;
A protective member that covers the third cable and the third connection terminal from the attachment position of the third connection terminal in the traveling wheel across the traveling transmission case;
The work vehicle according to any one of claims 1 to 3 , further comprising: A third cable connecting the first cable and the fertilizer concentration sensor disposed in the traveling transmission case;
A third connection terminal provided at a base of the third cable and connected to the fertilizer concentration sensor;
A terminal protection wall that surrounds at least a part of the previous SL third connection terminal,
Working vehicle according to claim 1, characterized in that it comprises a.

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