JP2010172300A - Working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a working machine brought to carry out good weeding operation by bringing solely a part of working units to be removable in a simple construction to bring the operation to be easy and constructing a leveling device which is an auxiliary device not to be obstacle for working when a weeding unit is installed as a working unit. <P>SOLUTION: The working machine is provided with: a liftable vertical link 43 on the rear side of a travelling vehicle body 2 through a lift link device 3; a base frame 150 for attaching and detaching to the vertical link 43 to be laterally rolling through a connection shaft 44 in the back and forth direction; and a leveling rotor 27 to the base frame 150 for attaching and detaching through an up/down motion mechanism to be movable upward and downward, and a weeding unit 152 is mounted to the base frame 150 attached and detached through a removing hitch 151, to float the leveling rotor 27 from the ground at a position higher than the lower end of the weeding unit 152 in which the weeding unit 152 is mounted. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention belongs to the technical field of a working machine including a weeding unit for performing weeding such as paddy fields.

  As an example of a working machine, a paddy field weeding machine provided with a vertical link that can be moved up and down via a lifting link device on the rear side of a traveling vehicle body, and a weeding portion provided on the vertical link via a connecting shaft in the front-rear direction. It has been known. The weeding part of this paddy weeder performs weeding work in the paddy field after planting, and the inter-row weeding device that performs weeding work between the planting strips and the inter-weeding device that performs weeding work between the plants in the planting strips It is driven by the power from the traveling vehicle body, the base ends of the balance springs provided on the left and right are connected to the balance adjustment lever, and the urging force of the left and right balance springs is controlled by operating the balance adjustment lever to the left and right. It is the structure which adjusts a balance and stabilizes the right-and-left rolling attitude | position of a streak weeding apparatus and a stock weeding apparatus with an appropriate attitude | position.

  This paddy weeder is configured to become a seedling transplanter, i.e., a riding rice transplanter, by connecting a seedling planting unit instead of a weeding unit, and different types of working units are connected instead of a weeding unit. This is a configuration that can be performed (see Patent Document 1).

  In recent years, in order to save work, there is a demand in the market for a configuration in which a plurality of work devices can be mounted so that a plurality of operations can be performed simultaneously, such as a seedling planting operation and a land preparation operation, a fertilization operation, and a chemical spraying operation. ing. Also, for example, the lifting link device provided on the rear side of the traveling vehicle body is different so that it can cope with different forms of work such as direct sowing work (seeding work), seedling planting work, drug spraying work after seedling planting, and weeding work. There is also a demand for multi-purpose work machines that can attach and detach various types of working parts and have improved versatility.

JP 2003-204708 A

  When it is configured to be able to attach different working parts with a multi-purpose work machine, for example, when it is possible to attach a seeding part for direct sowing work and a seedling planting part for seedling planting work, leveling work in any work There is a form that performs the fertilization work at the same time, and if it is configured so that only a part of the working part of the seeding part or the seedling planting part can be detached while leaving the auxiliary work device such as the leveling device and the fertilizer device on the traveling vehicle body side, The configuration of the multipurpose work machine is simplified, and the work section can be easily attached and detached. However, for example, working with dissimilar working parts that perform work after seedling planting, such as drug spraying parts for drug spraying work after seedling planting and weeding parts for weeding work after seedling planting In some cases, auxiliary work devices such as leveling devices and fertilizers left on the traveling vehicle body may be unnecessary, and the unnecessary auxiliary work devices may interfere with work.

  Therefore, the present invention aims to facilitate the detachment work of the working part by detaching only a part of the working part with a simple configuration, and when the weeding part is attached as the working part, the leveling device as an auxiliary working device is provided. It is an object of the present invention to obtain a working machine that can perform good weeding work as a configuration that does not interfere with work.

In order to solve the above problems, the following technical measures were taken.
That is, according to the first aspect of the present invention, the longitudinal link (43) is provided on the rear side of the traveling vehicle body (2) via the lifting link device (3) so as to be movable up and down, and the longitudinal link (43) is connected in the front-rear direction. A detachable base frame (150) is provided to be able to roll left and right via a shaft (44), and a ground leveling device (27) is provided to the detachable base frame (150) to be vertically movable via a vertical movement mechanism. The weeding part (152) is attached via the attaching / detaching hitch (151) attached to and detached from the attaching / detaching base frame (150), and the leveling is performed more than the lower end of the weeding part (152) in the state where the weeding part (152) is attached. It was set as the working machine which was set as the structure which the apparatus (27) floats with respect to the ground at high level.

  Therefore, this working machine moves the weed body by the traveling vehicle body (2), raises and lowers the weeding portion (152) to an appropriate height by the lifting link device (3), and appropriately tilts the right and left by the connecting shaft (44). Roll left and right to the posture and perform weeding work. Since the leveling device (27) floats with respect to the ground with the weeding portion (152) attached, the ground is not leveled with the weeding portion (152) attached. Further, when a different working unit is mounted instead of the weeding unit (152), the leveling work can be performed by the leveling device (27).

The invention according to claim 2 is the work machine according to claim 1, further comprising a drive check device that checks the drive of the leveling device (27) in a state where the weeding portion (152) is mounted.
Therefore, in addition to the operation of the invention according to claim 1, this working machine has the weeding part (152) not driven by the driving check device with the weeding part (152) being mounted. The leveling device (27) that drives the seedlings and crops already planted in the attached state is not touched.

  Therefore, according to the invention according to claim 1, the leveling device (27) does not level the ground with the weeding part (152) attached, and the seedlings and crops already planted by performing leveling work by mistake can be obtained. This can prevent damage.

  Further, according to the invention according to claim 2, in addition to the effect of the invention according to claim 1, the leveling device (27) that drives the seedlings and crops already planted with the weeding portion (152) attached is touched. This can further prevent damage to seedlings and crops already planted.

Side view of a working machine (direct seeding machine) equipped with a seeding unit Plan view showing the structure of the leveling rotor and its surroundings Front view showing the leveling rotor and its surroundings Side view showing the structure of the center float and its surroundings Side view of a working machine (weeding machine) equipped with a weeding unit An expanded plan view showing the weeding part in an easy-to-understand manner

One embodiment of the present invention will be described below.
As an example of a working machine working in a paddy field, first, a direct sowing machine 1 equipped with a sowing part as a working part will be described. In this direct sowing machine 1, a seeding unit 4 is mounted on the rear side of the traveling vehicle body 2 via an elevating link device 3 so as to be movable up and down, and a main body portion of the fertilizer application device 5 is provided on the rear upper side of the traveling vehicle body 2. The seeding unit 4 is provided with a detachable base frame 150 on a vertical link 43 that is lifted and lowered by the lift link device 3 via a connecting shaft 44 in the front-rear direction, and can be attached to and detached from the detachable base frame 150. It is detachably provided via a hitch 151. Therefore, a seedling planting part or a weeding part 152 can be installed as a ground working part instead of the sowing part 4, and if a seedling planting part is installed, it becomes a seedling transplanter (rice transplanter), and the weeding part 152 is installed. It will become a weeder.

  The traveling vehicle body 2 is a four-wheel drive vehicle including a pair of left and right front wheels 10 and 10 and a pair of left and right rear wheels 11 and 11 as drive wheels, and a transmission case 12 is disposed at the front of the fuselage. Front wheel final cases 13, 13 are provided on the left and right sides of the case 12, and the left and right front wheels are mounted on the left and right front wheel axles projecting outward from the respective front wheel support portions capable of changing the steering direction of the left and right front wheel final cases 13, 13. 10 and 10 are respectively attached. Further, the front end portion of the main frame 15 is fixed to the rear portion of the transmission case 12, and a rear wheel gear case 18, with a rear wheel rolling shaft provided horizontally in the front and rear sides at the rear left and right center of the main frame 15 as a fulcrum. The rear wheels 11 and 11 are attached to a rear wheel axle that is supported in a freely rolling manner and projects outwardly from the rear wheel gear cases 18 and 18. In addition, 11a and 11a are auxiliary wheels mounted on the inner side of the left and right rear wheels 11 and 11.

  The engine 20 is mounted on the main frame 15, and 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 (HST) 23. The rotation power transmitted to the mission case 12 is shifted by the transmission in the case 12 and then separated into traveling power and external power to be taken out. A part of the traveling power is transmitted to the front wheel final cases 13 and 13 to drive the front wheels 10 and 10, and the rest is transmitted to the rear wheel gear cases 18 and 18 to drive the rear wheels 11 and 11. Further, the external take-out power is transmitted to a planting clutch case 25 provided at the rear portion of the traveling vehicle body 2, and then transmitted to the fertilizer application device 5 by the fertilizer transmission mechanism 28. The power from the planting clutch case 25 is transmitted to the seeding unit 4 via the work transmission shaft 26. The planting clutch case 25 is provided with an inter-strain shifting unit for gear shifting, and is transmitted through the inter-strain shifting unit, and the seeding sowing is performed by changing the operating speed of the sowing unit 4 with respect to the traveling speed by the inter-strain shifting unit. It is configured to change the interval, that is, between the seedling stocks. On the right side of the seat 31, a stock shift lever 90 is provided for shifting the stock shift section.

  The upper part of the engine 20 is covered with an engine cover 30, and a seat 31 is installed thereon. A front cover 32 incorporating various operation mechanisms is provided in front of the seat 31, and a handle 34 for steering the front wheels 10 and 10 is provided above the front cover 32. The engine cover 30 and the front cover 32 have horizontal floor steps 35 on the left and right sides of the lower end. The floor step 35 is partly in a lattice shape, and the operator who is seated on the seat 31 and controls the aircraft can see the front wheels 10 and the rear wheels 11 and can be easily operated. Mud on the shoe of the worker walking in step 35 is allowed to fall to the field. The rear portion of the floor step 35 is a rear step 36 that also serves as a rear wheel fender.

  In addition, on the left and right sides of the front part of the traveling vehicle body 2, preliminary seedling platforms 38 and 38 on which a seedling for replenishment when a seedling planting part is mounted as a ground working part are placed to the side of the body. It is rotatably provided at a position and a position housed inside.

  The elevating link device 3 has a parallel link configuration, and includes one upper link 40 and a pair of left and right lower links 41, 41. These links 40, 41, 41 are pivotally attached to a rear-view portal-shaped link base frame 42 erected on the rear end of the main frame 15, and a vertical link 43 is connected to the tip side. ing. The seedling connection shaft 44 is inserted and connected to the lower end portion of the vertical link 43, and the detachable base frame 150 is rolled right and left around the connection shaft 44 so that the seeding portion 4 is connected to the left and right rolling freely. An elevating hydraulic cylinder 46 is provided between a support member fixed to the main frame 15 and a tip end portion of a swing arm integrally formed with the upper link 40, and the upper link 40 is expanded and contracted by hydraulic pressure. Rotates up and down, and the sowing part 4 moves up and down with a substantially constant posture. In addition, a rolling hydraulic cylinder 153 is provided between the vertical link 43 and the detachable base frame 150. By extending and contracting the rolling hydraulic cylinder 153 with hydraulic pressure, the detachable base frame 150 is rolled to the left and right, sowing. Roll to the left and right so that the unit 4 has a desired left-right tilted posture (left-right horizontal posture). The rolling hydraulic cylinder 153 is operated by switching the rolling hydraulic valve based on the detection of the left / right inclination angle sensor 154 provided on the traveling vehicle body 2.

  The sowing unit 4 is configured to simultaneously sow six strips, and includes a seed hopper 91, a feeding device 92, a sowing tube 93, and a wind turbine 94, and the feeding device 92 feeds seeds in the seed hopper 91 by a predetermined amount. The seeds that have been fed and fed are energized by the pressure wind from the wind turbine wheel 94, supplied to the sowing position in the field by the sowing tube 93, and sowed. In addition, in front of the sowing position, a grooving device 95 for making a sowing groove is attached to the floats 55 and 56. In addition, behind the sowing position, a cover plate 96 that covers the seed sowed is attached to the floats 55 and 56. The cover plate 96 is configured to be able to change the front and rear inclination angles in plan view of the body, and the degree of cover can be adjusted by changing the angle. The feeding device 92 includes a feeding roll having a number of feeding grooves formed on the outer periphery, and is configured to feed seeds by rotation of the feeding roll. The wind turbine wheel 94 uses an electric motor as a drive source. The feeding device 92 is driven by the power of the work transmission shaft 26. Therefore, the feeding device 92 can be driven in proportion to the traveling speed, and seeding can be performed at a desired seeding interval and seeding density regardless of the traveling speed. In addition, if the rotation speed of the work transmission shaft 26 is changed by operating the inter-stock shift lever 90, the drive rotation speed of the feeding device 92 can be changed.

  At the lower part of the seeding part 4, a center float 55 is provided in the center, and side floats 56, 56 are provided on the left and right sides thereof. When the aircraft is advanced with these floats 55, 56, 56 in contact with the mud surface of the field, the floats 55, 56, 56 slide while leveling the mud surface. Each of the floats 55, 56, and 56 is rotatably mounted around the float fulcrum shaft 97 so that the front end side thereof moves up and down in accordance with the unevenness of the field topsoil surface. Is detected by the angle-of-attack control sensor 101 through the detection arm 99 and the detection link 100 from the mounting member 98 integrated with the float 55, and the sowing section is switched by switching the hydraulic valve that controls the lifting hydraulic cylinder 46 according to the detection result. By raising and lowering 4, the planting depth of the seedling is always maintained constant. The float fulcrum shaft 97 of the floats 55, 56, 56 is supported by each float support arm 103 extending rearward from the common seeding depth adjustment shaft 102. By rotating the seeding depth adjusting shaft 102, the vertical position of the floats 55, 56, 56 with respect to the machine body is changed to change the seeding depth.

  The detection arm 99 is connected to the mounting member 98 so as to be rotatable up and down around the fulcrum shaft 104. A fixing pin 106 provided on the mounting member 98 is provided in one of the plurality of adjustment holes 105 at the rear end. It is fixed to the attachment member 98 so as not to enter and rotate. The adjustment knob 107 integral with the fixing pin 106 allows the operator to change the adjustment hole 105 into which the fixing pin 106 is inserted, and change the fixing position of the detection arm 99 with respect to the mounting member 98. Accordingly, the detecting arm 99, the fixing pin 106, and the adjusting knob 107 constitute an adjusting device 108 that changes and adjusts the detected value of the angle-of-attack control sensor 101 with respect to the front and rear tilt angle of the center float 55. Since the adjustment knob 107 serving as the operation tool of the adjustment device is provided on the rear side of the fulcrum shaft 104, the position of the detection arm 99 and the rear end of the mounting member 98, and further on the rear side of the seeding depth adjustment shaft 102. The detachable hitch of the sowing unit 4 and the leveling rotor 27 do not get in the way, and the operator can easily operate by putting his hand from the rear side of the sowing unit 4. On the other hand, when the seeding unit 4 is attached / detached, the adjusting device can be easily operated without disturbing the operation of the attachment / detachment hitch. Conventionally, since the adjustment knob is arranged on the front side of the seeding depth adjustment shaft and the detection link, the operator has to operate the adjustment knob from the front side of the sowing part, and the sowing detachable hitch and ground leveling rotor are not provided. It was difficult to operate. Moreover, there was a possibility that the adjusting device may be deformed by the attaching / detaching operation of the seeding part.

  The fertilizer application device 5 is configured to simultaneously apply fertilizers for six strips corresponding to the seeding strips of the seeding unit 4, and the granular fertilizer stored in the fertilizer hopper 60 is fed out by a certain amount by the feeding unit 61. The fertilizer is guided to the fertilizer guides 62a attached to the left and right sides of the floats 55, 56, 56 with the fertilizer hose 62, and is placed near the side of the seedling planting strip by the grooved body 62b provided on the front side of the fertilizer guide 62a. It is designed to drop into the fertilization premises that are formed. The air generated by the blower 58 driven by the electric motor is blown into the fertilizer hose 62 through the air chamber 59 that is long in the left-right direction, and the fertilizer in the fertilizer hose 62 is forcibly conveyed by wind pressure. It has become.

  On the front side of the seeding unit 4, a leveling rotor 27 (right and left leveling rotors 27a and 27a disposed in front of each of the left and right side floats 56 and 56, the center) is a leveling device for leveling and leveling the mud surface disturbed in the field. A central leveling rotor 27b) arranged in front of the float 55 is attached. A beam member 66 rotatably supported at the distal ends of left and right arms 65c, 65c having a base fixed to a first support frame 65 that extends integrally with the detachable base frame 150 and that is fixed to both ends of the beam member 66. Support arms 67, 67 and left and right leveling rotor support frames 68, 68, which are rotatably attached to the support arms 67, 67, are provided. Drive shafts 70a and 70a of left and right leveling rotors 27a and 27a are rotatably supported and attached to lower ends of the left and right rotor support frames 68 and 68, respectively. The first support frame 65 includes left and right vertical frames 109 extending downward from the left and right ends of the first support frame 65, and a horizontal frame 110 in the left-right direction that connects the left and right vertical frames 109. The left and right vertical frames 109 and the horizontal frame 110 integrally form a support frame. This support frame is disposed between the left and right rear wheels 11 in front of the machine body. Therefore, the support frame does not interfere with the rear wheel 11, in other words, the support frame such as the vertical frame 109 can be brought closer to the rear wheel 11 side (front side) in a side view of the body, and the longitudinal length of the body can be shortened. The front / rear weight balance of the aircraft is improved and workability is improved.

  The left and right ends of the horizontal frame 110 are provided with left and right support bodies 111 extending obliquely rearward and downward, and the left and right connecting members 71 are connected to a rotation fulcrum shaft 112 provided at the front end of the left and right support bodies 111 so as to be rotatable up and down. is doing. Near the lower end portions of the left and right leveling rotor support frames 68 and 68 are connected to the other end side (front end side) of the left and right connecting member 71. The left and right support members 111 are configured to extend obliquely to the lower rear side, and the rotation fulcrum shaft 112 is disposed at the oblique rear lower side position of the horizontal frame 110 so as not to obstruct the seedling planting portion. While the horizontal frame 110 is disposed at the traveling vehicle body side (front side) position, the rotation fulcrum shaft 112 can be disposed at the rear position to obtain the length (front-rear length) of the left and right connecting members 71, and the leveling rotor. 27 desired strokes of vertical movement can be obtained. Moreover, if the length (front-rear length) of the left and right connecting members 71 is long, the amount of movement of the leveling rotor 27 in the front-rear direction by rotating the left and right connecting members 71 up and down can be suppressed, and as a result, the leveling rotor moves. Since the space can be reduced, the longitudinal length of the aircraft can be shortened. Therefore, the mud surface disturbed by the left and right rear wheels 11 and 11 is well leveled by the left and right leveling rotors 27a and 27a, and an appropriate seedling transplanting operation can be performed.

  A bent portion 113 made of a U-shaped plate that opens to the rear is provided at an appropriate position (two places on the left and right) of the first support frame 65, and the first support frame 65 is placed at the position of the bent portion 113. It is displaced to the front side. Thereby, when the seedling planting part is mounted, the left and right vertical frames that support the seedling mounting base enter the bent part 113 and do not interfere with the first support frame 65. Therefore, the seedling planting part can be brought closer to the traveling vehicle body side, the longitudinal length of the aircraft can be shortened, the longitudinal weight balance of the aircraft can be improved, and the workability can be improved.

  Further, the central leveling rotor 27 b in front of the center float 55 is disposed in front of the left and right leveling rotor 27 a in front of the side float 56 due to the arrangement position with the floats 55 and 56. That is, left and right chain cases 73 and 73 are arranged from the inner side of the drive shafts 70a and 70a of the left and right leveling rotors 27a and 27a toward the front of the machine body, and the drive shaft of the central leveling rotor 27b is interposed between the left and right chain cases 73 and 73. A central leveling rotor 27b is provided to support 70b.

  Then, power is transmitted from the gear in the gear case 18 of the rear wheel 11 to the drive shaft 70a of the left leveling rotor 27a via the universal joint 72, and the central leveling is performed from the left drive shaft 70a by the chain in the left chain case 73. The power is transmitted to the drive shaft 70b of the rotor 27b, and power is transmitted from the drive shaft 70b to the drive shaft 70a of the right leveling rotor 27a through the chain in the right chain case 73.

  Further, a support member 77 in the vertical direction is rotatably connected to the tip of the link member 76 whose base is fixed to the beam member 66, and a plurality of engagement holes 77 a, 77 b, 77 c provided in the support member 77 are connected. The front part of the center leveling rotor 27b is suspended from the center part in the left-right direction via a spring 78 engaged with the upper part.

  Next, the structure which operates the leveling rotor 27 to a vertical position adjustment and a storage position is demonstrated. A pivot pin 81b is fixed to the first support frame 65 toward the front of the machine body, and a leveling rotor vertical position adjustment lever 81 is pivotally supported on the pivot pin 81b so as to be rotatable in the lateral direction of the machine body. Further, a bent piece 82 is fixed to the lower end portion of the leveling rotor vertical position adjusting lever 81, and the leveling rotor vertical position adjusting lever 81 is rotatably supported when the leveling rotor vertical position adjusting lever 81 is rotated in the horizontal direction of the machine body. The bent piece 82 pivots up and down by coming into contact with the protrusion 66a fixed to the beam member 66 from below. Since the bent piece 82 is in contact with the lower portion of the projecting portion 66a, the projecting portion 66a rotates in the right direction (arrow S direction) of the leveling rotor vertical position adjusting lever 81, so that the beam member 66 is upward. Rotate around the center. Since the left and right support arms 67 and 67 and the left and right leveling rotor support frames 68 and 68 are moved upward by the upward rotation of the beam member 66, the left and right leveling rotors 27a and 27a are moved upward and the beam member 66 is moved. The link member 76 and the support member 77 to which the base portion is fixed are also moved upward, and the front portion of the central leveling rotor 27b is also moved upward via the spring 78.

  On the contrary, when the leveling rotor up / down position adjusting lever 81 is rotated to the left of the machine body, the bent piece 82 is separated from the lower side of the protruding portion 66a, so that the protruding portion 66a is centered on the beam member 66 downward by the weight of the leveling rotor 27. Rotate as Since the left and right support arms 67 and 67 and the left and right leveling rotor support frames 68 and 68 are moved downward by the downward rotation of the beam member 66, the left and right leveling rotors 27a and 27a are moved downward and the beam member 66 is moved downward. The link member 76 and the support member 77 to which the base portion is fixed are also moved downward, and the front portion of the central leveling rotor 27b is also moved downward via the spring 78.

  The leveling rotor vertical position adjusting lever 81 is disposed between the control seat 31 and the seedling mount 51 at the central portion (or substantially central portion) of the seedling planting portion 4 toward the control seat 31. Since the operation direction is the left and right direction of the machine body, the operation when moving the leveling rotor 27 up and down is easy, and the seedling mounting base is installed when the seedling planting part is mounted. It can be arranged in a narrow space in the front-rear direction of the aircraft, and the overall length of the aircraft can be shortened. Further, the right and left balance of the aircraft is good, and appropriate work can be performed. Further, the leveling rotor vertical position adjusting lever 81 can be operated even when the sowing unit 4 is lowered in the seedling transplanting state, so that appropriate vertical height adjustment can be performed.

  Further, in order to move the leveling rotor 27 to the storage position where the leveling operation is not performed, the leveling rotor vertical position adjusting lever 81 is operated to the right (to the storage operation position) in the same manner as the upward operation of the leveling rotor 27. The leveling rotor 27 can be moved to the storage position, that is, the position where it does not come into contact with the seeding unit 4 even when it is lowered.

  In the present embodiment, the leveling rotors 27a and 27b at a standard position of the leveling rotor up / down position adjusting lever 81 at a height of 40 mm from the field scene can be raised by up to 15 mm from the standard position by turning in the direction of arrow S in FIG. 4 is set so that it can be lowered by up to 15 mm from the standard position by turning in the direction opposite to the arrow S direction. The vertical height adjustment of the leveling rotor 27 by the leveling rotor vertical position adjusting lever 81 is simultaneously performed when the rear turning fulcrum of the floats 55 and 56 is moved up and down to change the sowing depth, and the appropriate leveling is performed. It is intended to make the action possible.

  In particular, in order to keep the seeding depth constant at the time of the sowing operation, the center float 55 that functions as a sensor for controlling the raising and lowering of the seeding unit 4 must have a longer front-rear length and a longer ground contact area in the front-rear direction. The raising / lowering control of the appropriate seedling planting part 4 cannot be performed. Therefore, the central leveling rotor 27b in front of the center float 55 is configured to be positioned in front of the fuselage with respect to the left and right leveling rotor 27a in front of the side float 56, but the central leveling rotor 27b and the left and right leveling rotor 27a are different from each other. The left and right chain cases 73, 73, which are the power transmission mechanism, are integrated with each other, and can be adjusted up and down and moved to the storage position by one vertical movement mechanism operated by the leveling rotor vertical position adjustment lever 81. Therefore, it is possible to obtain a direct sowing machine having a simple configuration and a light weight, and because of its light weight, it exhibits excellent running performance in paddy fields and can perform a good sowing work.

  However, because the central leveling rotor 27b in front of the center float 55 with a longer front-rear length and a longer ground contact area in the front-rear direction is disposed between the left and right rear wheels 11, 11, the overall length of the aircraft is shortened. The central leveling rotor 27b is positioned below the left and right lower links 41, 41 of the lifting link device 3. When the sowing unit 4 is to be raised, the central leveling rotor 27b collides with the left and right lower links 41, 41. Therefore, there is a problem that the seeding unit 4 cannot be raised.

  Therefore, the central leveling rotor 27b in front of the center float 55 is disposed in front of the central leveling rotor 27b via a spring 78 having upper portions engaged with a plurality of engagement holes 77a, 77b, 77c provided in the support member 77. The part is suspended. Therefore, when the sowing section 4 is lowered and the work is performed while leveling with the leveling rotor 27, the center leveling rotor 27b has the spring 78 slightly extended by its weight and becomes the same height as the left and right leveling rotor 27a. When the sowing section 4 is raised, the upper surface of the central leveling rotor 27b comes into contact with the left and right lower links 41, 41, and the spring 78 extends greatly as the sowing section 4 rises. The leveling rotor 27b is changed to a posture facing downward, and the sowing unit 4 can be raised without any trouble.

  Further, the central leveling rotor 27b has a configuration in which the front portion of the central leveling rotor 27b is suspended via a spring 78 having upper portions engaged with a plurality of engagement holes 77a, 77b, 77c provided in the support member 77. Therefore, when the seed leveling rotor 4 is lowered due to a manufacturing error of the spring 78, a weight error of the center leveling rotor 27b, or the like, and the center leveling rotor 27b is different in height from the left and right leveling rotor 27a, the spring 78 By changing the engagement holes 77a, 77b, and 77c for engaging the upper part of the rotor and adjusting the vertical height of the central leveling rotor 27b, the central leveling rotor 27b is made to be the same height as the left and right leveling rotor 27a, so that proper leveling is achieved. Work can be done.

  Further, if the damper is interposed between the support member 77 and the central leveling rotor 27b to prevent the central leveling rotor 27b from shaking up and down by the spring 78, the leveling performance is further improved. Further, instead of changing the hole for engaging the upper part of the spring 78, an adjustment lever may be provided to adjust the engagement position between the spring 78 and the support member 77.

  By the way, on the right side of the right chain case 73, a hardness / softness detection device 114 for detecting the hardness of the soil is provided. This hardness / softness detection device 114 is provided with a soil surface detection tool 115 for detecting the height of the soil surface by touching the field and a hardness / softness detection tool 116 that enters the soil. Each of the soil surface detector 115 and the soft / soft detector 116 includes arm portions 115a and 116a that can be turned up and down, and rotatable roller portions 115b and 116b that are attached to the rear ends of the arm portions 115a and 116a. The roller portions 115b and 116b are configured to enter the ground or the soil. In addition, the center of the roller portion 116b of the hardness / softness detection tool 116 is sharp so as to easily enter the soil. The relative relationship of the angle between the arm portion 115a of the soil surface detector 115 and the arm portion 116a of the hardness / softness detection tool 116 is detected by a potentiometer to detect the hardness / softness of the soil. The arm portions 115a and 116a of the soil surface detection tool 115 and the hardness / softness detection tool 116 use the drive shaft 70b of the center leveling rotor 27b extending to the right side of the right chain case 73 as a rotation fulcrum shaft. Further, the hardness / softness detector is disposed between the central leveling rotor 27b and the left and right rear wheels 11 (right side) and on the front side of the left and right side (right side) leveling rotor 27a. The base part of the hardness detecting device such as the potentiometer is supported on the side surface of the right chain case 73 via a mounting stay. Therefore, since the hardness detecting device 114 is attached and supported from the ground leveling rotor to be grounded and its related parts, the hardness detecting device 114 can be disposed near the soil surface, and the detection accuracy of hardness is improved. Based on the detection of hardness / softness by the hardness / softness detection device 114, the inclination angle of the cover plate 96 is automatically changed to control the degree of cover. The arm length of the arm portion 116a of the hardness / softness detection tool 116 is configured to be longer than the arm length of the arm portion 115a of the soil surface detection tool 115 so that the hardness / softness detection can be performed stably and accurately.

  When the direct sowing machine 1 is placed in a flooded field, the fertilizer hopper 60 is filled with fertilizer, and the seed hopper 91 is filled with seeds and moved forward to start the seeding operation. The raising / lowering link device 3 is actuated by detection to control the raising / lowering of the seeding unit 4 and the leveling rotor 27, and the detachable base frame 150 is rolled left and right by detecting the left / right inclination posture of the traveling vehicle body 2 by the left / right inclination angle sensor 154. 4 and the leveling rotor 27 are subjected to left-right rolling control, the field scene is leveled by the leveling rotor 27, and sowing work is performed while fertilizing the leveled field.

  Next, the weeding machine in which the weeding unit 152 is attached to the detachable base frame 150 in place of the seeding unit 4 will be described. The configuration other than the sowing unit 4 to be attached / detached such as the traveling vehicle body 2 and the leveling rotor 27 is the same as described above. The weeding part 152 is attached to the attaching / detaching base frame 150 via the attaching / detaching hitch 151, and the inter-weeding device 155 that performs the weeding work between the planting strips, and the inter-weeding device that performs the weeding work between the plants on the planting strips. 156, which is driven by the power from the work transmission shaft 26 via the transmission in the weeding part transmission case 157, and performs the weeding work in the paddy field after rice planting.

  The interstitial weeding device 155 includes a total of seven rotating weeding bodies 158 located between the planting strips and on the left and right outer sides of the planting strips, and the rotary weeding body 158 drives and rotates to remove the grass in the field. It has become the composition which goes. The rotating weeding body 158 includes a rotating frame 159 on the rotation center side and a rotating weeding claw 160 fixed to an appropriate position on the outer periphery of the rotating frame 159. A weeding cover 160 is provided on the upper side of the rotating weeding body 158, and the weeding cover 160 receives the grass, mud, or water so that the rotating weeding body 158 jumps up. In addition, a guide plate 161 is provided at the front end of the weeding cover 160, and the planted seedling or crop is guided to the position where the rotating weeding body 158 does not act by the guide plate 161.

  The inter-strain weeding device 156 is disposed on the front side of the streak weeding device 155, and has a swinging frame 162 that is reciprocated to the left and right and swings in the left-right direction, and is attached to an appropriate position of the swinging frame 162. The rocking weeding bodies 163 are provided at a total of seven locations located between the ligaments and on the left and right outer sides of the planting ridges. The swinging herbicidal body 163 is arranged between the planting strips in a position biased to the left and right outer sides close to the planting strips, and includes a plurality of front and rear positions at each of the left and right outer sides. It is placed near the planting strip. Therefore, the swinging weeding body 163 on the front side brings the planted seedlings or crops to the other side, and the swinging weeding body 163 on the rear side enters between the plants and weeds. The swinging weeding body 163 extends from the front side to the rear side, and has a configuration in which the weeding effect is enhanced by a shape bent in a ninety-nine fold shape.

  A sensor float 164 is provided between the central planting strips and at the front and rear positions overlapping with the swinging herbicidal body 163 in a side view of the body, and the front part of the float 164 is moved up and down in the same manner as the seeding part 4 described above. Is detected by the angle-of-attack control sensor 101, and the weeding part 152 is raised and lowered by switching the hydraulic valve that controls the raising / lowering hydraulic cylinder 46 according to the detection result, so that the ground height of the weeding part 152 is always maintained constant. . A sensor body 165 is provided at the front end of the sensor float 164, and the planted seedlings or crops are guided to the position where the sensor float 164 does not act by the guide body 165. The left and right rolling is the same as the sowing part 4 described above, but the weeding part 152 itself is also configured to be able to roll slightly to the left and right, and the base end is connected to the support frame 166 constituting the weeding part 152 to the left and right. Each balance spring 167 is provided, and the left and right balance springs 167 stabilize the right and left rolling postures of the inter-row weeding device 155 and the inter-strain weeding device 156 in an appropriate posture. Further, the weed height adjustment lever 168 is configured to be able to adjust the height to change to a desired position by moving the inter-row weeding device 155 and the inter-strain weeding device 156 up and down with respect to the support frame 166.

  In the state where the sowing unit 4 is mounted on the detachable base frame 150, the upper link 40 and the lower link 41 of the lifting / lowering link device 3 are in the rear lowering posture at the work height at which the floats 55 and 56 are grounded. When mounted on the detachable base frame 150, the upper link 40 and the lower link 41 of the lifting / lowering link device 3 are rotated to the upper side than the state where the seeding unit 4 is mounted in the rearward raising posture at the work height at which the sensor float 164 contacts the ground. It becomes the rotated position which moved. Therefore, in the state where the weeding unit 152 is mounted, the leveling rotor 27 is higher than the state where the sowing unit 4 is mounted, and the leveling rotor 27 is raised to the ground. At this time, even if the leveling rotor 27 is positioned at the lowest position by the vertical movement mechanism by the leveling rotor vertical position adjusting lever 81, it floats to the ground without being grounded.

  The left and right leveling rotor 27a is positioned above the sensor float 164 when the weeding part 152 is mounted, and the front and rear positions of the weeding part 152 and the leveling device 27 are overlapped. The front and rear length is shortened to make it compact.

  Further, when the lower link 41 of the lifting link device 3 is rotated upward from a predetermined position, the leveling rotor clutch 170 provided in the gear case 18 of the rear wheel 11 is operated via the interlocking cable 169 connected to the lower link 41. Then, the driving of the leveling rotor 27 is stopped. Thereby, the driving of the leveling rotor 27 can be automatically stopped by rotating the lifting / lowering link device 3 to a high position during non-working such as turning on the coast or during weeding work with the weeding unit 152 attached. . Accordingly, the interlocking cable 169, the leveling rotor clutch 170, and the like serve as a driving check device that checks the driving of the leveling rotor 27 with the weeding portion 152 attached.

  It should be noted that since the left and right positions of the outermost rotary weeding body 158 are likely to change due to the change in the traveling direction of the airframe, and the rotating weeding body 158 easily interferes with the adjacent seedlings, The left-right width of the rotating weeding body 158 between the planting strips is set to the same width (the same left-right width including the weeding portion transmission case 157 is the same between the strips with the weeding portion transmission case 157). Only the body 158 may be configured such that the left and right widths are narrowed so that the rotating herbicidal body 158 does not easily interfere with the seedlings of adjacent strips due to a change in the traveling direction due to the steering of the airframe. In addition, since the rotating herbicide body 158 on the left and right outer sides is more likely to interfere with the seedlings and crops on the planting strip due to the change in the traveling direction of the aircraft, the width on the left and right outer rotating herbicide body 158 may be narrower. Also about the arrangement | positioning of the rocking weeding body 163 of each site | part, you may set the left-right width similarly to the above-mentioned rotation weeding body 158.

  As described above, in this weeder, the vertical link 43 is provided on the rear side of the traveling vehicle body 2 via the lifting link device 3 so as to be movable up and down, and the detachable base frame 150 is connected to the vertical link 43 via the connecting shaft 44 in the front-rear direction. Is provided so as to be able to roll right and left, and the leveling rotor 27 is supported on the detachable base frame 150 via a vertical movement mechanism so as to be movable up and down, and a weeding portion is provided via a detachable hitch 151 attached to and detached from the base frame 150 for detachment. 152 is mounted, and the leveling rotor 27 floats above the ground at a higher position than the lower end of the weeding portion 152 with the weeding portion 152 mounted.

  Accordingly, while the vehicle body is traveling by the traveling vehicle body 2, the weeding unit 152 is moved up and down to an appropriate height by the elevating link device 3 and is rolled left and right by the connecting shaft 44 to an appropriate left and right inclined posture to perform weeding work. Since the leveling rotor 27 floats with respect to the ground with the weeding portion 152 attached, the ground is not leveled with the weeding portion 152 attached. Therefore, it is possible to prevent the seedlings and crops already planted from being damaged by performing leveling work by mistake. In addition, when a different working unit such as the sowing unit 4 is mounted instead of the weeding unit 152, the leveling work can be performed by the leveling rotor 27.

In addition, a driving restraint device that restrains the driving of the leveling rotor 27 in a state where the weeding portion 152 is mounted is provided.
Therefore, since the leveling rotor 27 is not driven with the weeding part 152 attached by the driving check device, the leveling rotor 27 that drives the seedlings and crops already planted with the weeding part 152 attached is not touched. Therefore, it is possible to further prevent the seedlings and crops already planted from being damaged.

  If the seedling height or crop height is high and the leveling rotor 27 may touch the seedling or crop, the leveling rotor vertical position adjusting lever 81 is appropriately operated to raise the leveling rotor 27 to a height at which the leveling rotor 27 does not touch the seedling or crop. Move it.

  When the traveling speed of the traveling vehicle body 2 is high, the inter-strain weeding device 156 of the weeding unit 152 does not act sufficiently between the strains, and the weeding effect may be reduced. Accordingly, a lever lever 171 is provided for operating the hydraulic continuously variable transmission 23 to change the running speed so that high-speed running is not possible when the space between the stocks is narrow, and a lever stopper for restricting the operation of the shifting lever 171 to the high speed side. 172 may be provided so that the lever stopper 172 can be switched to the restricted state. In addition, a lever stopper operating device that is an actuator such as an electromagnetic solenoid that operates the lever stopper 172 is provided, and an inter-strain detection device such as an image processing device including a photographing camera is provided in the weeding unit 152, and the inter-strain detection device narrows the inter-strain. When it is determined, a control device for operating the lever stopper operating device in a restricted state may be provided. Similarly, a streak detection device for detecting the spacing between the seedlings already planted is provided, and when it is determined by the streak detection device that any of the streak is narrow, the lever stopper operating device is set to a restricted state. A control device to be operated may be provided.

  In addition, a contact sensor is provided for detecting that the swinging herbicidal body 163 touches a seedling or a crop when the swinging herbicidal body 163 itself is pushed in the left-right direction, and a lever stopper operating device based on the detection of the contact sensor. And a control device that automatically regulates high-speed traveling or automatically reduces traveling speed may be provided. Thereby, it is possible to prevent the rotating weeding body 158 and the swinging weeding body 163 from being damaged by touching the seedlings and crops due to a sudden change in the traveling direction of the machine body.

  Further, when any of the striations is determined to be narrow by the streak detection device, the descent speed of the lifting / lowering link device 3 is slowed down by the hydraulic valve that controls the lifting / lowering hydraulic cylinder 46, and the weeding unit 152 at the start of the weeding operation is started. It is possible to slow down the descending speed and prevent the rotating weeding body 158 and the swinging weeding body 163 from touching the seedlings and crops due to a sudden change in the traveling direction of the aircraft immediately after the turning.

  Further, when it is detected that any planting line is so narrow that the rotating weeding body 158 and the swinging weeding body 163 cannot be accommodated by the line detecting device, the lowering of the weeding part 152 is regulated by the hydraulic valve, and the weeding part is moved to the maximum position. You may provide the control apparatus which raises to a raise position. Thereby, it can prevent that a seedling and a crop are damaged. In addition, a control apparatus is good also as a structure which stops a driving | running | working of a body by operating a lever stopper operating device in connection with the fall regulation of this weeding part.

  In addition, a seedling detection sensor for detecting the position of the seedling for each strain is provided by an image processing device or the like, and a swing amount changing device for changing the swing amount of the swing frame 162 on the transmission path to the swing frame 162 is provided. A control device may be provided that controls the swing amount changing device so that the swinging herbicidal body 163 swings with a large stroke at the position between the strains based on the detection of the seedling detection sensor. Thereby, weeding between the strains can be performed efficiently without damaging seedlings and crops with the swinging herbicide 163. The swing amount changing device may be configured to operate the shift operation shifter of the transmission that changes the transmission ratio to the swing frame 162 with an actuator such as an electric motor.

  Furthermore, in order to improve the workability of the weeding work, a handle turning angle sensor for detecting the turning angle of the handle 34 is provided. When the handle turning angle sensor detects that the handle 34 has been operated more than a predetermined angle, the lifting link device 3 removes the weed. When the driving of the weeding unit 152 is stopped and the driving of the weeding unit 152 is stopped and the handle 34 is returned to the neutral position is detected by the steering angle sensor, the lifting / lowering link device 3 automatically lowers the weeding unit 152. What is necessary is just to provide the control apparatus which performs the turning control which starts the drive of the weeding part 152. FIG. The control device issues an output command to the drive valve of the hydraulic valve and the weeding unit 152. Thereby, the raising / lowering operation of the weeding part 152 becomes unnecessary at the time of turning, and operativity improves. At this time, if the weeding unit 152 descends while the aircraft is aligned immediately after the turn, the rotating weeding body 158 and the swinging weeding body 163 may touch the seedlings and crops. If the weeding part 152 is lowered when it is detected that the position 34 is in the neutral position for a predetermined time or longer, the weeding part 152 can be lowered while the machine body is completely straightened, and the rotating weeding body 158 and the rocking weeding body 163 can be prevented from touching seedlings and crops. In addition, after detecting that the handle 34 is in the neutral position by the steering angle sensor, it is determined that the machine body is completely in a straight traveling state as a configuration in which the weeding unit 152 is lowered when a predetermined time has elapsed. May be. In addition, after determining that the airframe has completely settled in a straight traveling state, a control device that drives the weeding unit 152 by setting the driving clutch of the weeding unit 152 to the transmission state may be provided.

  When the weeding unit 152 is mounted, the setting of the handle 34 for raising and stopping the driving of the weeding unit 152 in the turning control is not performed more than when other working units such as the seeding unit 4 and the seedling planting unit are mounted. The corner is set small. Thereby, the weeding part 152 can be raised rapidly at the time of a turning start, and it can prevent damaging a seedling and a crop by the weeding part 152. In addition, when the weeding unit 152 is mounted, the ascending speed of the weeding unit 152 in the turning control can be set faster than when other working units such as the sowing unit 4 and the seedling planting unit are mounted. Note that whether or not the weeding unit 152 is mounted is determined by operating the work machine type setting switch operated by the operator, the work machine identification sensor provided in the detachable hitch unit, or the wiring of the electrical equipment on the weeder 152 side. This can be done with an identification device such as a connection connector connected to the wiring on the vehicle body 2 side.

  Since the leveling rotor 27 is not used when weeding, a configuration in which a weeding device can be mounted on the drive shaft 70a of the leveling rotor 27 and a weeding device can be mounted instead of the leveling rotor 27 is possible. As a specific example, a rotational weeding body can be mounted on the drive shaft 70a, and the rotational weeding body can be driven to rotate around the driving shaft 70a. At this time, in order to set the rotational speed of the drive shaft 70a to a weeding speed, a counter transmission case for weeding may be mounted. Since the leveling rotor 27 is driven by the power from the rear wheel gear case 18 that is transmitted via the side clutch, the side clutch becomes a safety clutch automatically when the overload is applied, and the drive is stopped automatically. This safety clutch can also be used in a weeding device.

  1: Direct sowing machine (work machine), 2: traveling vehicle body, 3: lifting link device, 4: seeding unit, 27: leveling rotor, 43: vertical link, 44: connecting shaft, 150: base frame for attachment / detachment, 151: attachment / detachment Hitch, 152: Weeding section

Claims (2)

  A vertical link (43) is provided on the rear side of the traveling vehicle body (2) via an elevating link device (3) so as to be movable up and down, and the vertical link (43) is attached to an attachment / detachment base via a connecting shaft (44) in the front-rear direction. A frame (150) is provided so as to be able to roll left and right, and a leveling device (27) is provided on the detachable base frame (150) via a vertical movement mechanism so as to be movable up and down, and is attached to and detached from the detachable base frame (150). The weeding portion (152) is attached via the removable hitch (151), and the leveling device (27) is higher than the lower end of the weeding portion (152) with the weeding portion (152) attached to the ground. A working machine with a structure that rises up.   The work machine according to claim 1, further comprising a drive check device that checks the drive of the leveling device (27) in a state where the weeding portion (152) is mounted.

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