JP2007300873A - Seedling transplanter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that a conventional seedling transplanter has a complicated constitution that a seedling planting apparatus is separately equipped with right and left soil preparation rotors and a central soil preparation rotor and yet the weights of the soil preparation rotors are increased and seedling transplantation workability in a field is deteriorated. <P>SOLUTION: The seedling transplanter has a constitution that a seedling planting part 4 is equipped with a central soil preparation operation apparatus 27b between right and left rear wheels 11 on the side view of a machine body ahead a center float 55 positioned between the right and left rear wheels 11 when viewed from the front of the machine body, right and left soil preparation operation apparatuses 27a are arranged behind the right and left rear wheels 11 on the on the side view of the machine body at the front of a side float 56 positioned at the rear or the external side of the right and left rear wheels 11, the central soil preparation operation apparatus 27b is connected to the right and left soil preparation operation apparatuses 27a and integrated, a driving power is transmitted from a traveling body 2 side to the central soil preparation operation apparatus 27b by a driving member 72 and a driving power is transmitted from the central soil preparation operation apparatus 27b to the right and left soil preparation operation apparatuses 27a by right and left transmission mechanisms 73. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a seedling transplanter equipped with a leveling work device for leveling a field scene (headland) that has been roughened by wheels when the machine is turned at the heel.

Conventionally, this type of seedling transplanter (passenger type rice transplanter) includes a leveling rotor for leveling and leveling a farm scene immediately before seedling planting by a seedling planting device.
This seedling transplanter of this prior art was able to level the farming scene (headland) devastated by the wheels when turning the aircraft by leveling with the leveling rotor and improve the work efficiency. .
JP 2003-102219 A

  The seedling transplanting machine disclosed in the above-mentioned patent document has a complicated configuration in which the right and left leveling rotor and the central leveling rotor are separately mounted on the seedling planting device, and the weight of the leveling rotor Is a structure that becomes very heavy, and deteriorates seedling transplanting workability in the field.

  The invention described in claim 1 is a seedling transplanting machine in which a seedling transplanting unit 4 is mounted on the rear side of a traveling vehicle body 2 equipped with left and right rear wheels 11 via a lifting link device 3. A central leveling device 27b is provided between the left and right rear wheels 11 in front of the center float 55 located between the left and right rear wheels 11 when viewed from the front, and a side float located behind or outside the left and right rear wheels 11. The left and right rear leveling work devices 27a are provided behind the left and right rear wheels 11 in front of the body 56, and the central leveling work device 27b and the left and right leveling work devices 27a are connected to form an integrated structure and driven from the traveling vehicle body 2 side. It is a seedling transplanter configured to transmit a driving force to the central leveling work device 27b by the member 72, and to transmit the driving force from the central leveling work device 27b to the left and right leveling work device 27a by the left and right transmission mechanism 73. is there

  Therefore, since the field scene disturbed at the time of turning the body at the shore can be leveled by the central leveling work device 27b and the left and right leveling work device 27a and the seedling transplanting work can be performed, an appropriate seedling transplanting work can be performed efficiently. Further, the central leveling work device 27b is provided between the left and right rear wheels 11 ahead of the left and right leveling work devices 27a arranged behind the left and right rear wheels 11, and the overall length of the machine body is shortened. 27b and the left and right leveling work device 27a are connected to form an integrated structure, so that a simple structure is obtained. Further, the central leveling work device 27b located in the left and right central portion of the machine body in front of the left and right leveling work device 27a is Since it is disposed at a position closest to the traveling vehicle body 2, the driving force is transmitted from the traveling vehicle body 2 side to the central leveling work device 27 b by the drive member 72, and the central leveling work device 27 b transmits to the left and right transmission mechanism 73. By adopting a configuration in which the driving force is transmitted to the left and right leveling work device 27a, the central leveling work device 27b and the left and right leveling work device 27a can be driven with a simple transmission configuration. , The weight of the entire body to be able to lightweight construction, running performance on water paddy field becomes good properly performed seedling porting.

  The invention according to claim 2 is the seedling transplanting machine according to claim 1 in which the left and right sides of the central leveling work device 27b and the inner end sides of each of the left and right leveling work devices 27a are connected by the left and right transmission mechanism 73. is there.

  Therefore, in addition to the operation of the first aspect of the invention, the left and right sides of the central leveling work device 27b and the inner end sides of the left and right leveling work devices 27a are connected by the left and right transmission mechanism 73. 27b and the left and right leveling work device 27a have a simple drive structure, and the left and right transmission mechanism 73 also serves as a connecting member, so that the weight of the machine can be further reduced and the vehicle can be driven in a paddy field. The performance is further improved and seedling transplanting work can be performed appropriately.

  According to the third aspect of the present invention, the left and right sides of the central leveling work device 27b and the inner ends of each of the left and right leveling work devices 27a are connected by the left and right transmission mechanism 73, and the left and right transmission mechanism 73 is connected to the center float 55 and the left and right sides. The seedling transplanting machine according to claim 1, which is disposed between the rear wheels 11.

  Therefore, in addition to the operation of the first aspect of the invention, the left and right sides of the central leveling work device 27b and the inner end sides of the left and right leveling work devices 27a are connected by the left and right transmission mechanism 73. 27b and the left and right leveling work device 27a can be simply connected. Further, the weight of the machine can be reduced, the running performance in the paddy field can be further improved, and the seedling transplanting work can be performed appropriately. Further, since the left and right transmission mechanism 73 is disposed between the center float 55 and the left and right rear wheels 11, the left and right transmission mechanism 73 prevents the mud lifted by the left and right rear wheels 11 from falling on the center float 55, and the center float 55. When the center float 55 is configured to have a function as a sensor that controls the raising and lowering of the seedling planting unit 4, the seedling planting unit 4 properly The raising and lowering control is performed, so that a good seedling planting operation can be performed.

  In the invention according to claim 4, the central leveling work device 27b is connected to the left and right leveling work device 27a, and when the seedling planting part 4 is raised by the lifting link device 3, the central leveling work device 27b is moved to the lifting link device 3. The seedling transplanting machine according to claim 1, wherein the center leveling work device 27b is supported by the support mechanism 78 so as to be movable up and down with respect to the left and right leveling work device 27a so as to move downward.

  Therefore, in addition to the operation of the first aspect of the present invention, the central leveling work device 27b is provided between the left and right rear wheels 11 in front of the left and right leveling work devices 27a arranged at the rear of the left and right rear wheels 11, so When the seedling planting section 4 is raised, the central leveling work device 27b is prevented from moving down and being damaged by contacting the lifting link device 3 while being configured to be short. 4 can be raised appropriately.

  According to the present invention, the field scene disturbed at the time of turning the body at the shore can be leveled by the center leveling work device 27b and the left and right leveling work device 27a to perform seedling transplanting work. I can do it well. Further, the central leveling work device 27b is provided between the left and right rear wheels 11 in front of the left and right leveling work devices 27a arranged behind the left and right rear wheels 11, and the overall length of the body is shortened with a simple drive configuration. The overall weight can be reduced, and in particular, the running performance in paddy field is good and the seedling transplanting operation can be performed appropriately.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.
FIG.1 and FIG.2 is the side view and top view of a riding type rice transplanter with a fertilizer applicator equipped with a fertilizer applicator according to an embodiment of the present invention. In this riding type rice transplanter 1 with a fertilizer application, a seedling planting portion 4 is mounted on the rear side of the traveling vehicle body 2 via an elevating link device 3 so that the seedling planting portion 4 can be moved up and down. Is provided.

  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. The front end of the main frame 15 is fixed to the rear portion of the transmission case 12, and the left and right rear wheel gear case 18 is supported by a rear wheel rolling shaft provided horizontally in the front and rear at the center of the rear end of the main frame 15. , 18 are supported in a freely rolling manner, and rear wheels 11, 11 are attached to rear wheel axles that protrude outwardly from the left and right rear wheel gear cases 18, 18. Note that power is transmitted to the left and right rear wheel gear cases 18 and 18 by left and right rear wheel transmission shafts 18a and 18a connected to left and right rear wheel drive shafts that protrude from the rear wall of the transmission case 12. Yes.

  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 the belt transmission device 21 and the HST 23. The rotational power transmitted to the mission case 12 is shifted by a transmission in the case 12 and then separated into traveling power and external power to be extracted. 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 left and right rear wheel gear cases 18 and 18 to drive the left and right rear wheels 11 and 11. . Further, the external extraction power extracted from the right side surface of the mission case 12 is transmitted to the seedling planting unit 4 by the planting transmission shaft 26. The power is taken out from the right rear wheel gear case 18 by the drive shaft 29 and transmitted to the fertilizer feeding mechanism of the fertilizer applicator 5.

  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. A plurality of through holes 35a... Are formed in the left and right front portions of the floor step 35, and a driver who is seated on the seat 31 and controls the aircraft can see the left and right front wheels 10 and 10 and is easy to control. In addition, the mud on the shoes of the worker walking in the step 35 falls on the field. The rear portion of the floor step 35 is a rear wheel fender 36 that also serves as a rear step.

Further, on both the left and right sides of the front part of the traveling vehicle body 2, the spare seedling platforms 38, 38 on which the replenishment seedlings are placed can be pivoted to a position projecting laterally from the machine body and a position housed inside. Is provided.
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. 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 whose base is pivotally supported on the main frame 15 is connected to a leading end of a swing arm (not shown) integrally formed with the upper link 40. Is hydraulically expanded and contracted, the upper link 40 is rotated up and down, and the seedling planting part 4 is lifted and lowered with a substantially constant posture.

  The seedling planting section 4 has a four-row planting structure, a transmission case 50 also serving as a frame, a mat seedling, and a left and right reciprocating motion to supply seedlings one by one to the seedling outlet 51a of each row and for one horizontal row When all the seedlings are supplied to the seedling outlet 51a ..., the seedling mount 51 for transferring the seedling downward by the seedling feeding belt 51b ..., the seedling planting device 52 for planting the seedling supplied to the seedling outlet 51a ... in the field. A pair of left and right drawing markers (not shown) for drawing the aircraft path in the next stroke to the topsoil surface are provided. In the lower part of the seedling planting 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, and the seedling planting device 52 ... Seedlings are planted. Each of the floats 55, 56, and 56 is rotatably mounted so that the front end side moves up and down in accordance with the unevenness of the field topsoil surface, and the vertical movement of the front part of the center float 55 is an angle-of-attack control sensor during planting work. The planting depth of the seedling is always kept constant by switching the hydraulic valve that controls the lifting hydraulic cylinder 46 according to the detection result to raise and lower the seedling planting unit 4 according to the detection result. .

  The fertilizer applicator 5 feeds the granular fertilizer stored in the fertilizer hopper 60 by a certain amount by the feeding section 61... And applies the fertilizer to the left and right sides of the floats 55, 56 and 56 with the fertilizer hose 62. Are guided into the fertilization premises formed near the side portion of the seedling planting line by the grooved body 62b provided on the front side of the fertilizer application guide 62a. 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.

  The seedling planting section 4 is provided with a leveling rotor 27 for leveling and leveling the mud surface disturbed in the field (in front of the left and right leveling rotors 27a and 27a and the center float 55 arranged in front of each of the left and right side floats 56 and 56). An arranged central leveling rotor 27b) is mounted. In addition, the seedling stage 51 is configured to slide in the left-right direction using a support roller 65a of a rectangular support frame body 65 whose base is fixed to the transmission case 50 that also serves as a frame of the seedling planting unit 4 as a rail.

Reference numerals 28 and 28 are left and right auxiliary steps, which are steps for placing a foot when an operator gets on and off the aircraft.
The principal part of the leveling rotor support structure is shown in the side view of FIG. 3 and the rear view of FIG. 4, and the principal part top view of the leveling rotor 27, the floats 55 and 56, and the seedling planting apparatus 52 part is shown in FIG.

Here, the support structure and drive configuration of the leveling rotor 27 will be described.
A beam member 66 rotatably supported at the distal ends of left and right arms 65c, 65c having base portions fixed to the support frame body 65 of the seedling stage 51, and left and right support arms 67, 67 fixed to both ends of the beam member 66; Left and right leveling rotor support frames 68 and 68 are rotatably mounted on the support arms 67 and 67, respectively. 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 low support frames 68 and 68, respectively. Further, near the lower ends of the left and right leveling rotor support frames 68, 68 are connected to left and right connecting members 71, 71 whose bases are rotatably attached to the transmission case 50.

  The portions (bearing portions) 69 and 69 where the lower ends of the left and right low support frames 68 and 68 support the left and right ground leveling rotors 27a and 27a rotatably are positioned behind the left and right rear wheels 11 and 11, respectively. ing.

  Further, the central leveling rotor 27b in front of the center float 55 is arranged in front of the left and right leveling rotors 27a and 27a in front of the left and right side floats 56 and 56 in relation 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.

  On the other hand, a transmission case 90 is provided at the center of the drive shaft 70b of the center leveling rotor 27b so as to be rotatable with respect to the drive shaft 70b, and is transmitted from the gear in the left gear case 18 of the left rear wheel 11 through the universal joint 72. The power is transmitted from 90 to the drive shaft 70b of the central leveling rotor 27b. And it transmits to the drive shafts 70a, 70a of the left and right leveling rotors 27a, 27a from both ends of the drive shaft 70b of the central leveling rotor 27b through the chains in the left and right chain cases 73, 73, and the power is supplied to the left and right leveling rotors 27a, 27a. Is transmitted.

  The gear shaft of the left gear case 18 is provided with a clutch C that turns on and off the power to the universal joint 72. One end of the operation wire W is linked to a shifter (switching tool) of the clutch C, and the operation wire W With this operation, the power to the universal joint 72 is turned on and off to switch between the state in which the leveling rotor 27 is driven and the state in which it is stopped. That is, the other end of the operation wire W is linked to the leveling rotor vertical position adjusting lever 81 and the lifting link device 3, and the clutch C is engaged in the vertical position adjusting operation when the leveling rotor 27 is used by the leveling rotor vertical position adjusting lever 81. Thus, the leveling rotor 27 is driven, and when the leveling rotor 27 is moved up to the storage position by the leveling rotor vertical position adjusting lever 81, the clutch C is turned off and the leveling rotor 27 is stopped. Further, when the seedling planting part 4 is lowered to the planting work state by the lifting link device 3, the clutch C is engaged and the leveling rotor 27 is driven, and the seedling planting part 4 is brought to the non-planting work state. When lifted by the lift link device 3, the clutch C is disengaged and the leveling rotor 27 is stopped.

  Further, since the central leveling rotor 27b is located between the left and right rear wheels 11, 11 in front of the left and right leveling rotors 27a, 27a located behind the left and right rear wheels 11, 11, the drive shaft of the central leveling rotor 27b 70b is close to the gear case 18 of the left and right rear wheels 11, and the seedling planting part 4 moves up and down with respect to the traveling vehicle body 2, so that the drive shaft 70b of the center leveling rotor 27b and the gear case of the left and right rear wheels 11 The distance to 18 varies greatly with the up and down movement of the seedling planting part 4. Accordingly, the universal joint 72 includes an outer shaft 72a having a fitting hole having a hexagonal cross section, an intermediate shaft 72b that is fitted in the fitting hole having a hexagonal cross section of the outer shaft 72a, and is extended and contracted, and the intermediate shaft. The inner shaft 72c is fitted into a fitting hole having a hexagonal cross section provided in 72b and slides in an expansion / contraction direction, and the extension / contraction length is increased. Therefore, the drive from the gear case 18 of the rear wheel 11 to the drive shaft 70b of the central leveling rotor 27b is performed by the universal joint 72 having a long expansion / contraction length. Even if the distance varies greatly due to the raising / lowering movement of the seedling planting section 4, the leveling rotor 27 can be driven well, and the leveling rotor 27 exhibits a good leveling action, so that an appropriate seedling planting operation can be performed. Yes.

  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 U-shaped body 80a provided at the center of the support frame 65 of the seedling stage 51 in the left-right direction and provided downward, and is fixed to the front of the machine body. A ground leveling rotor vertical position adjusting lever 81 is pivotally supported by 81b so as to be rotatable in the left-right 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 when the leveling rotor vertical position adjusting lever 81 is rotated in the left-right direction of the machine body, both sides of the support frame 65 are arranged. The bent piece 82 is rotated up and down by coming into contact with the protrusion 66a fixed to the beam member 66 rotatably supported by the member 65b from below. Since the bent piece 82 is in contact with the lower portion of the projecting portion 66a, the projecting portion 66a is turned upward by rotating the leveling rotor vertical position adjusting lever 81 in the right direction of the machine body (the direction of arrow S in FIG. 4). It rotates around the beam member 66. 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 the leveling rotor 27 is moved up and down is easy, and the front side of the seedling stage 51 is arranged in the front and rear direction of the machine body. It can be arranged in a narrow space and the length of the aircraft can be shortened. Furthermore, the aircraft has a good left / right balance, and appropriate seedling transplanting work can be performed. Further, since the leveling rotor vertical position adjusting lever 81 can be operated even when the seedling planting portion 4 is lowered in the seedling transplanting operation state, 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, to the back side of the seedling stage 51 so as to be in the storage state.

  Reference numeral 81a denotes a lever guide for the leveling rotor vertical position adjusting lever 81, which is provided with an engaging groove for engaging and fixing the lever at the operating position when the lever is operated. Further, the leveling rotor vertical position adjusting lever 81 is configured such that the gripping portion 81c is bent to the opposite side to the operation direction (arrow S direction) for moving the leveling rotor 27 upward, and the operator holds the gripping portion 81c. When gripping and operating the leveling rotor vertical position adjustment lever 81 to move the leveling rotor 27 upward, even if the gripping worker's hand slips from the gripping portion 81c, the operator's hand stops at the shaft portion 81d. The leveling rotor 27 can be prevented from falling. Further, when the gripping portion 81c is gripped so that the side of the hand is in contact with the shaft portion 81d, it becomes easier to apply a force to the lever in the direction in which the leveling rotor 27 is moved upward by operating the leveling rotor vertical position adjusting lever 81. The upward movement can be easily performed. Further, by bending the gripping portion 81c, which is the tip of the leveling rotor vertical position adjusting lever 81, the leveling rotor vertical position adjusting lever 81 can be arranged in a narrow space, and the size of the machine body can be reduced.

  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 performed at the same time when the rear rotation fulcrum of the floats 55 and 56 is moved up and down to change the planting depth of the seedling. Appropriate ground leveling can be performed.

  In particular, in order to keep the seedling planting depth constant at the time of planting work, the center float 55 that functions as a sensor for controlling the raising and lowering of the seedling planting unit 4 has a long front and rear length and a ground contact area. If it is not long in the front-rear direction, appropriate raising / lowering control of the 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 rice transplanter with a leveling device that is simple in construction and light in weight, and exhibits excellent running performance in paddy fields due to its light weight, so that a good seedling transplanting operation can be performed.

  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 center leveling rotor 27b is positioned below the left and right lower links 41, 41 of the lifting link device 3. When the seedling planting part 4 is to be raised, the center leveling rotor 27b is placed on the left and right lower links 41, 41. There is a problem that it becomes a configuration in which the seedling planting part 4 cannot be raised due to a collision.

  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 seedling planting part 4 is lowered and the seedling planting operation is performed while leveling with the leveling rotor 27, the center leveling rotor 27b has the spring 78 slightly extended by its weight so that it is as high as the left and right leveling rotor 27a. Therefore, when the seedling planting portion 4 is raised, the contact portion 91 provided on the upper surface of the central leveling rotor 27b contacts the left and right lower links 41, 41, and seedling planting is performed. As the attaching part 4 rises, the spring 78 is greatly extended, and the center leveling rotor 27b is changed to a posture facing downward, so that the seedling attaching part 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 seedling planting part 4 is lowered due to a manufacturing error of the spring 78, a weight error of the center leveling rotor 27b, etc., when the center leveling rotor 27b is different in height from the left and right leveling rotor 27a, The engagement holes 77a, 77b, 77c for engaging the upper part of the spring 78 are changed to adjust the vertical height of the central leveling rotor 27b so that the central leveling rotor 27b is the same height as the left and right leveling rotor 27a. Smooth grading work can be performed.

  On the other hand, the left and right chain cases 73 and 73 of the center leveling rotor 27b are formed by the center float 55 having a function as a sensor for controlling the raising and lowering of the seedling planting portion 4 and the left and right rear wheels 11 and 11 (left and right auxiliary wheels 11a and 11a). The left and right chain cases 73 and 73 prevent the mud soil lifted by the left and right rear wheels 11 and 11 (left and right auxiliary wheels 11a and 11a) from falling on the center float 55 because the structure is located between them. Since the front part of the float 55 moves up and down appropriately following the mud surface, the seedling planting unit 4 is appropriately controlled to move up and down, and a good seedling planting operation can be performed.

  In particular, the field scene disturbed during the turning of the aircraft at the shore can be leveled by the central leveling rotor 27b and the left and right leveling rotors 27a and 27a, so that the seedling transplanting operation can be performed. The In addition, the central leveling rotor 27b is provided between the left and right rear wheel 11 in front of the left and right leveling rotors 27a, 27a disposed behind the left and right rear wheels 11, and the overall length of the fuselage is shortened. And the left and right ground leveling rotors 27a and 27a are connected to form an integrated structure, so that a simple configuration is achieved. Further, the central leveling rotor 27b located in the left and right central portion of the body on the front side of the body with respect to the left and right leveling rotors 27a and 27a, Since it is disposed at a position closest to the traveling vehicle body 2, a driving force is transmitted from the traveling vehicle body 2 side to the central leveling rotor 27 b by the universal joint 72, and from the central leveling rotor 27 b to the left and right chain cases 73 and 73. Thus, the center leveling rotor 27b and the left and right leveling rotor 27a can be configured with a simple transmission configuration by transmitting the driving force to the left and right leveling rotors 27a and 27a. To be able to drive the 27a, the weight of the entire body to be able to lightweight construction, driving performance is appropriately performed seedling porting becomes excellent in water paddy field.

  In addition, FIG. 6 shows the example of the structure which made the seedling planting part 4 into 5-row planting, and it is comprised with the same structural member as said Example, and puts the transmission case 50 and mat seedling which also serve as a frame. When the seedlings are reciprocated to the left and right, and the seedlings are fed to the seedling take-out outlets 51a of each row and all the seedlings for one horizontal row are fed to the seedling take-out outlets 51a, the seedlings are transported downward by the seedling feeding belt 51b. A seedling planting device 52 for planting seedlings supplied to the stage 51, seedling outlet 51a, etc. in the field is provided. In the lower part of the seedling planting 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, and the seedling planting device 52 ... Seedlings are planted. Each of the floats 55, 56, and 56 is rotatably mounted so that the front end side moves up and down in accordance with the unevenness of the field topsoil surface, and the vertical movement of the front part of the center float 55 is an angle-of-attack control sensor during planting work. The planting depth of the seedling is always kept constant by switching the hydraulic valve that controls the lifting hydraulic cylinder 46 according to the detection result to raise and lower the seedling planting unit 4 according to the detection result. .

  Further, the central leveling rotor 27b disposed at the front position of the center float 55 that leveles the planting position for the two central strips is configured to have a lateral width that levels the planting position for the two central strips. The left and right leveling rotors 27a, 27a arranged at the front positions of the side floats 56, 56 leveling each planting position are configured so that the right and left widths of the left and right leveling rotors 27a, 27a can be leveled. It has become.

  The present invention can be applied to various seedling transplanting machines such as a vegetable transplanter and a grass transplanter in addition to the rice transplanter.

It is a side view of the riding type rice transplanter of the Example of this invention. It is a top view of the riding type rice transplanter of FIG. It is a principal part side view of the seedling planting part of FIG. It is a principal part front view of the support structure of the seedling mounting stand of FIG. It is a principal part top view of the seedling planting part of FIG. It is a principal part top view of the seedling planting part which shows another example.

Explanation of symbols

2 Traveling vehicle body 3 Elevating link device 4 Seedling planting part 11 Left and right rear wheels 27a Left and right leveling work device (left and right leveling rotor)
27b Central leveling equipment (central leveling rotor)
55 Center float 56 Side float 72 Drive member (universal joint)
73 Left / right transmission mechanism (left / right chain case)
78 Support mechanism (spring)

Claims (4)

  In a seedling transplanting machine in which a seedling planting part (4) is mounted on the rear side of a traveling vehicle body (2) equipped with left and right rear wheels (11) via a lifting link device (3), the seedling planting part (4) In front of the center float (55) located between the left and right rear wheels (11) when viewed from the front of the fuselage, a central leveling device (27b) is provided between the left and right rear wheels (11) when viewed from the side of the fuselage. 11) In front of the side float (56) located rearward or outwardly, a left and right leveling work device (27a) is provided behind the left and right rear wheels (11) in a side view of the body, and a central leveling work device (27b) is provided. The left and right leveling work device (27a) is connected to form an integrated structure, and the driving force is transmitted from the traveling vehicle body (2) side to the central leveling work device (27b) by the drive member (72), and the central leveling work device ( 27b) to the left and right leveling work device (27a) Seedling transplanter, characterized in that a structure for transmitting the driving force at 73).   The seedling transplanter according to claim 1, wherein the left and right sides of the central leveling work device (27b) and the inner end sides of the left and right leveling work devices (27a) are connected by a left and right transmission mechanism (73).   The left and right sides of the central leveling work device (27b) and the inner end sides of the left and right leveling work devices (27a) are connected by a left and right transmission mechanism (73), and the left and right transmission mechanism (73) is connected to the center float (55). The seedling transplanter according to claim 1, wherein the seedling transplanter is disposed between the left and right rear wheels (11).   The central leveling work device (27b) is connected to the left and right leveling work device (27a), and the central leveling work device (27b) is lifted and lowered when the seedling planting part (4) is lifted by the lift link device (3). The center leveling work device (27b) is supported by the support mechanism (78) so as to be movable up and down with respect to the left and right leveling work device (27a) so as to move downward in contact with the device (3). The seedling transplanter according to claim 1.

Images