JP2007166980A - Transplanter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transplanter with sufficient land-leveling ability which increases or decreases the rotation of a land-leveling rotor in response to a travel speed and simultaneously ensures the required rotation of the land-leveling rotor even in a low speed travel state at a travel-starting early time. <P>SOLUTION: This riding type transplanter comprising a travel machine frame 1 equipped with a HST 12 for changing the travel speed of the travel machine frame, a planting implement 3 liftably connected to the rear portion of the travel machine frame 1, and a land-leveling device 21 for leveling a field on the front side of the planting implement 3 is characterized by disposing the first PTO 36 which is rotated with a power taken out from the downstream transmission route of the HST 12 to proportionally increase or decrease the rotation with the increase or decrease of the travel speed, the second PTO 37 which is rotated with a power taken out from the upstream transmission route of the HST 12, and a PTO-selecting mechanism 38 for selecting a larger rotation speed PTO among both the PTO 36, 37 and driving the land-leveling device 21 by the rotation of the selected PTO. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a transplanter such as a riding rice transplanter, and more particularly, to a transplanter provided with a leveling rotor that performs leveling on the front side of a planting work machine.

In recent years, a transplanter including a leveling rotor at a front portion of a planting work machine is known (for example, see Patent Document 1). In such a transplanter, since leveling can be performed simultaneously with planting, planting accuracy and work efficiency can be improved.In particular, the leveling effect by the leveling rotor is remarkable in the headland where the surface of the field is rough due to the aircraft turning. Yes, planting accuracy can be greatly improved.
JP 2005-124442 A

  By the way, since the transplanter equipped with the leveling rotor normally drives the leveling rotor with the power extracted from the downstream transmission path of the traveling speed change mechanism, the rotational speed of the leveling rotor is proportional to the increase or decrease of the traveling speed. Increase or decrease. Thus, although the rotation of the leveling rotor suitable for the traveling speed can be obtained, in the low-speed traveling state, the rotation of the leveling rotor becomes too slow, and the required leveling performance may not be obtained. In particular, until the predetermined traveling speed is reached after the airframe is stopped, the leveling rotor rotation speed is insufficient, and the leveling performance may be affected.

  The present invention was created in view of the above-described circumstances to solve these problems, and is connected to a traveling machine body provided with a traveling speed change mechanism and a rear part of the traveling machine body so as to be movable up and down. And a leveling rotor that performs leveling on the front side of the planting work machine, and is rotated by power extracted from a downstream transmission path of the traveling speed change mechanism, and the number of rotations is a traveling speed. The first PTO that increases and decreases proportionally with the increase / decrease, the second PTO that rotates with the power extracted from the upstream transmission path of the traveling speed change mechanism, and the faster one of the two PTOs are selected and selected PTO And a PTO selection means for driving the leveling rotor by rotation. In this way, the speed of the leveling rotor is increased or decreased according to the traveling speed, but during low speed traveling, the leveling rotor is driven by the rotation of the second PTO. The required rotational speed of the rotor is ensured, and sufficient leveling performance can be obtained.

Next, embodiments of the present invention will be described with reference to the drawings. In FIG.
Reference numeral 1 denotes a traveling machine body of a riding rice transplanter, and a planting work machine 3 is connected to a rear portion of the traveling machine body 1 via an elevating link mechanism 2. A lift cylinder (not shown) is interposed between the traveling machine body 1 and the lifting link mechanism 2, and the planting work machine 3 is lifted and lowered based on the expansion and contraction thereof.

  As shown in FIG. 2, the traveling machine body 1 is provided with a hydraulic cylinder 6 connected to a lift cylinder hydraulic valve 5 and a planting clutch mechanism (not shown). The hydraulic cam 6 has four positions of “raising”, “fixing”, “lowering”, and “planting”, and the position is switched by the hydraulic cam motor 7. In the “raised” position, the lift cylinder hydraulic valve 5 is raised and the planting clutch mechanism is disengaged. In the “fixed” position, the lift cylinder hydraulic valve 5 is deactivated and the planting clutch mechanism is disengaged. In the “down (automatic)” position, the lift cylinder hydraulic valve 5 is in the lowered state (automatic lift control state by sensing float), and the planting clutch mechanism is in the disengaged state. In the “planting” position, the lift cylinder hydraulic valve 5 is The lowered state (automatic lift control state by the sensing float), the planting clutch mechanism is in the engaged state.

  As shown in FIGS. 1 and 3, on the upper part of the traveling machine body 1, a steering wheel 8 provided in front of the driver's seat, a planting work machine operation lever 9 that protrudes to one side from a column portion of the steering wheel 8, etc. Is provided. The planting work machine operation lever 9 is electrically connected to a control unit 10 described later, and has the following functions based on the control operation of the control unit 10. That is, the operation pattern of the planting work machine operation lever 9 corresponds to the positions “up”, “down (automatic)”, and “planting” of the hydraulic cam 6 described above. Every time it is operated upward, it moves in the upward direction (“planting” → “lowering (automatic)” → “raising”) and conversely every time the planting work machine operating lever 9 is operated downward (“ "Up" → "Down (automatic)" → "Planting"). Further, when the planting work machine operation lever 9 is operated in the reverse direction during the raising / lowering operation of the planting work machine 3, a “fixed” state is obtained. Thereby, the raising / lowering operation of the planting work machine 3 by the planting work machine operating lever 9 and the on / off operation of the planting clutch mechanism can be performed.

  As shown in FIGS. 1, 4, and 5, the traveling machine body 1 is output from an engine 11 mounted on the front part of the machine body, an HST (traveling transmission mechanism) 12 that continuously changes power of the engine 11, and an HST 12. A transmission 13 for inputting power, a front axle case (not shown) for transmitting traveling power output from the transmission 13 to the left and right front wheels 14, and a rear axle for transmitting traveling power output from the transmission 13 to the left and right rear wheels 15. A planting power output from the transmission 13 is transmitted to the planting work machine 3 that includes a case 16 and the like and is connected to the rear part of the machine body. The HST 12 is a hydrostatic continuously variable transmission device in which a variable displacement hydraulic pump and a fixed displacement hydraulic motor are connected via a closed circuit, and is used as a traveling main transmission mechanism in this embodiment.

  The planting work machine 3 includes a work machine frame 17 that is connected to the lifting link mechanism 2 in a freely rolling manner, a seedling table 18 provided in an inclined position above the work machine frame 17, and a plurality of plantings that extend rearward from the work machine frame 17. A transmission case 17a, a planting mechanism 19 provided at the rear end of each planting transmission case 17a, a float 20 provided below the planting transmission case 17a so as to be swingable up and down, and the like are configured. The horizontal feeding operation of the seedling stage 18 and the seedling planting operation of the planting mechanism 19 are performed by the planting power.

  The field where the planting operation is performed is flattened in advance by a scraping operation, and the planting seedling is planted by the planting mechanism 19 while the float 20 slides there. The planting accuracy may be reduced due to the rough surface due to wheel marks, etc. In particular, the headland where the airframe is turned is a place where the roughness of the surface due to the wheel marks is remarkable, and the planting accuracy tends to decrease. In order to cope with such a problem, a leveling device (leveling rotor) 21 is provided on the front side of the planting work machine 3. The leveling device 21 is disposed between the rear wheel 15 and the float 20 in a side view, and performs leveling work on the front side of the float 20. Thereby, the roughening of the surface by a wheel trace, etc. can be improved, and a planting precision can be raised, and especially the improvement effect is remarkable in a headland.

  As shown in FIG. 4, the leveling device 21 includes an input case 23 for inputting power from the rear axle case 16 via the transmission shaft 22, a rotor shaft 24 extending from the input case 23 to the left and right, and the rotor shaft 24. A pair of leveling rotors 25 provided integrally, a rotor cover 26 covering the top of the leveling rotor 25, and a pair of left and right shafts (not shown) that support the rotor shaft 24 rotatably. The ground leveling rotor 25 is rotated in a predetermined direction by power input from the rear axle case 16 side, and leveling is performed in front of the planting work machine 3.

  A pair of left and right seedling support stays 28 extending upward from the work machine frame 17 and a pair of left and right guide members 29 extending forward from the work machine frame 17 are integrally formed on the front portion of the planting work machine 3. The guide member 29 guides the support rod 27 of the leveling device 21 so as to be slidable up and down. The seedling stage stay 28 is for supporting the upper part of the seedling stage 18. In this embodiment, the seedling stage stay 28 is also used as a support member of the leveling device 21. That is, the seedling support stay 28 of the present embodiment includes a rotation shaft 30 that is supported between the left and right seedling support stays 28, and a pair of left and right arms that extend forward from both left and right ends of the rotation shaft 30. The leveling device 21 is suspended through a pair 31 and a pair of left and right links 32 that connect the arm 31 to the upper end of the support rod 27.

  The rotation shaft 30 is provided with a leveling device operation lever 33 that allows a vertical rotation operation and a horizontal tilt operation. When the leveling device operation lever 33 is rotated in the vertical direction, the link 32 moves up and down in accordance with the integral rotation of the rotation shaft 30 and the arm 31, and the height of the leveling device 21 changes. A lever guide 34 that holds the position of the leveling device operating lever 33 is provided at the upper end of the seedling support stay 28. That is, the lever guide 34 is formed with a plurality of locking recesses (not shown) at predetermined intervals in the vertical direction, and the locking projections (not shown) formed on the leveling device operation lever 33 side. The height of the leveling device 21 can be adjusted stepwise by locking it to an arbitrary locking recess according to the tilting operation of the leveling device operating lever 33.

  A power branch case 35 for branching the power of the leveling device 21 is provided at the front portion of the rear axle case 16. As shown in FIG. 5, the power branch case 35 receives power from the first PTO 36 and the second PTO 37, and inputs the power to the leveling device 21 via the PTO selection mechanism (PTO selection means) 38 and the rotor clutch mechanism 39. To be transmitted. The first PTO 36 is a transmission shaft that rotates with the power extracted from the downstream transmission path of the HST 12 and whose rotational speed increases and decreases proportionally as the traveling speed increases and decreases. Specifically, the first PTO 36 is output from the transmission 13. It can be configured by a transmission shaft that transmits wheel power to the rear axle case 16. The second PTO 37 is a transmission shaft that rotates with the power extracted from the upstream transmission path of the HST 12. Specifically, the second PTO 37 is arranged in parallel with the first PTO 36 and extracts the power from the input shaft of the HST 12 via the bevel gear 40. I do.

  The PTO selection mechanism 38 selects the faster one of the PTOs 36 and 37, and drives the leveling device 21 by the rotation of the selected PTO. For example, in the present embodiment, the first input gear 41 rotated by the power of the first PTO 36, the second input gear 42 rotated by the power of the second PTO 37, and both gears 41 and 42 are rotatably supported. An output shaft 43, a first one-way clutch 44 interposed between the output shaft 43 and the first input gear 41, and a second one-way clutch 45 interposed between the output shaft 43 and the second input gear 42. And the PTO selection mechanism 38 is configured. Both the one-way clutches 44 and 45 both transmit the rotation of the input gears 41 and 42 to the output shaft 43 and the clutch operating direction is set so as to cut off the reverse transmission, so that the rotation is fast. The input gears 41 and 42 on the one side rotate the output shaft 43 integrally, and the input gears 41 and 42 on the slower side are rotated in the reverse direction relative to the output shaft 43 and the transmission is cut off. In this way, as shown in FIG. 6, the leveling device 21 is driven by the rotation of the second PTO 37 during low-speed traveling, while the rotational speed of the leveling device 21 is increased or decreased according to the traveling speed. Even in a low-speed traveling state at the beginning of the start, the necessary rotational speed of the leveling device 21 is ensured and sufficient leveling performance can be obtained.

  As shown in FIG. 7, the traveling machine body 1 is provided with the above-described control unit 10 configured using a microcomputer (including a CPU, a ROM, a RAM, an I / O, and the like). On the input side of the control unit 10, the planting work machine operation lever 9 (lever operation detection switch), the hydraulic cam potentiometer 46 for detecting the position of the hydraulic cam 6, and the position of the leveling device operation lever 33 are detected. The leveling device operating lever potentiometer 47 is connected, and the hydraulic cam motor 7 described above and a rotor clutch cylinder (electric cylinder) 48 for turning on and off the rotor clutch mechanism 39 are connected to the output side of the control unit 10. . And the control part 10 performs the leveling apparatus drive control mentioned later according to the program written in ROM.

  As shown in FIG. 8, in the leveling device drive control, first, the operation position of the leveling device operation lever 33 is determined (S1). Here, when the operation position of the leveling device operation lever 33 is the non-working height, the rotor clutch mechanism 39 is turned off (S2). Further, when the operation position of the leveling device operation lever 33 is the work height, the position of the hydraulic cam 6 is determined (S3). Here, when the position of the hydraulic cam 6 is “up” or “fixed”, the rotor clutch mechanism 39 is turned off (S2), and when it is “down (automatic)” or “planting”, the rotor clutch The mechanism 39 is turned on (S4). By doing so, the leveling device 21 is driven only when the planting work machine 3 is lowered and the height of the leveling device 21 is adjusted to a work height that can be leveled. It is possible to regulate the driving of the leveling device 21 at the time of 3 ascent or during non-leveling work.

  According to the present embodiment configured as described, the traveling machine body 1 provided with the HST 12 that performs traveling speed change, the planting work machine 3 that is connected to the rear part of the traveling machine body 1 so as to be movable up and down, and the planting A riding rice transplanter including a leveling device 21 that performs leveling on the front side of the work machine 3, and rotates with the power extracted from the downstream transmission path of the HST 12, and the number of rotations increases and decreases proportionally as the traveling speed increases and decreases. A PTO selection mechanism that selects the first PTO 36, the second PTO 37 that rotates with the power extracted from the upstream transmission path of the HST 12, and the faster one of the PTOs 36 and 37, and drives the leveling device 21 by the rotation of the selected PTO. 38, the leveling device 21 can be driven by the rotation of the second PTO 37 during low-speed traveling, while the rotational speed of the leveling device 21 is increased or decreased according to the traveling speed. As a result, even in low-speed running state of the running initial stage, to ensure the required rotational speed of the leveling device 21, a sufficient leveling performance.

It is a whole side view of a riding rice transplanter. It is a front view which shows a hydraulic cam. It is a perspective view which shows a planting work machine operation lever. It is a side view which shows a planting work machine and a leveling apparatus. It is a power transmission circuit diagram of a riding rice transplanter. It is operation | movement explanatory drawing of a PTO selection mechanism. It is a block diagram which shows the input / output of a control part. It is a flowchart which shows leveling apparatus drive control.

Explanation of symbols

1 traveling machine body 3 planting work machine 11 engine 12 HST
13 Transmission 21 Leveling device 35 Power branch case 36 First PTO
37 Second PTO
38 PTO selection mechanism 41 First input gear 42 Second input gear 43 Output shaft 44 First one-way clutch 45 Second one-way clutch

Claims (1)

A traveling body provided with a traveling speed change mechanism;
A planting work machine connected to the rear part of the traveling machine body so as to be movable up and down;
A transplanting machine comprising a leveling rotor for leveling in front of the planting machine,
A first PTO that rotates with the power extracted from the downstream transmission path of the traveling speed change mechanism, and the number of rotations increases and decreases proportionally with the increase and decrease of the traveling speed,
A second PTO that rotates with power extracted from the upstream transmission path of the travel transmission mechanism;
A transplanter comprising: PTO selection means for selecting the faster rotation of the PTOs and driving the leveling rotor by rotation of the selected PTO.

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