JP2019062873A - Mulching transplanter - Google Patents

Abstract

To prevent drag of a sheet at the beginning of a work.SOLUTION: A mulching transplanter includes work starting-time control sensitivity blunting means for pressing a planting implement 3 onto a field surface by blunting hydraulic control sensitivity lower than set sensitivity, upon drop or grounding of the planting implement 3 onto the field surface, and work starting-time control sensitivity returning means for returning the hydraulic control sensitivity to the set sensitivity at a timing of traveling of a traveling machine body 1 as long as a prescribed distance L1, after blunting the hydraulic control sensitivity by the work starting-time control sensitivity blunting means.SELECTED DRAWING: Figure 12

Description

  The present invention relates to a multi-implantation machine for planting seedlings from above the sheet to the eyebrow scene while covering the eyebrow scene with a sheet.

  A sheet holding unit for holding sheets (multi) so as to be able to be fed out, and a planting mechanism for planting a seedling on a weir scene, and covering the weir scene with the sheet being fed out from the sheet holding unit according to the traveling of the machine There is known a multi-transplanting machine for sequentially planting a seedling in the moth scene from the top (see, for example, Patent Document 1). Generally, this type of multi-implantation machine does not have a mechanism for forcibly drawing out the sheet, but is configured to draw out the sheet as the machine travels by utilizing the adhesion between the sheet and the crawling scene.

Patent No. 4024417

  However, in such a multi-implantation machine, when the sheet does not sufficiently adhere to the crawling scene at the beginning of the operation, the sheet may be dragged, resulting in a sheet delivery failure.

The present invention has been made to solve these problems in view of the above situation, and the invention of claim 1 is vertically movably connected to the rear portion of a traveling airframe, and the traveling airframe according to the present invention A multi-transplanting machine comprising a planting work machine for planting seedlings on the field from above the sheet while covering the straw scene with the sheet according to traveling, wherein the planting work machine holds the sheet so as to be able to be drawn out. A holding unit, a planting mechanism for planting seedlings in a field, and a sensing float for sensing the height of the planting machine with respect to a dredging scene, the traveling machine body hydraulic lifting and lowering the planting machine Hydraulic lift control means for automatically controlling the height of the planting machine with respect to the scene based on the mechanism, the operation control of the hydraulic lift mechanism according to the height detection by the detection float, and the detection float by The hydraulic control sensitivity adjustment means for adjusting the hydraulic control sensitivity of the hydraulic lift control means for detecting the hydraulic pressure, and the hydraulic control sensitivity being duller than the set sensitivity at the time of lowering or grounding the planting work machine to the mastication scene After the operation start control desensitization means for pressing the planting work machine against the bird's eye scene and the operation start control desensitization means for the operation start control desensitization means reduce the oil pressure control sensitivity, the hydraulic pressure at a timing when the traveling machine travels a predetermined distance And a control sensitivity return means for returning the control sensitivity to the set sensitivity.
The invention according to claim 2 is the multi-transplanting machine according to claim 1, wherein the sheet cutting means is operated at the end of the planting operation stroke and cuts the end of the sheet delivered to the field, and the sheet cutting. The sheet cutting control sensitivity blunting means for pressing the planting work machine against the scene by making the hydraulic control sensitivity duller than the setting sensitivity when operating the means, and the sheet cutting control sensitivity blunting means is the hydraulic pressure The control sensitivity returning means after sheet cutting returns the hydraulic control sensitivity to the setting sensitivity at a timing when the planting work machine rises after lowering the control sensitivity.

According to the invention of claim 1, when lowering or grounding the planting work machine to the mastication scene, the control sensitivity at the start of the work to press the planting construction machine against the mastication scene by making the hydraulic control sensitivity duller than the set sensitivity. Since the blunting means is provided, the sheet can be firmly adhered to the scene at the beginning of the work, and the sheet can be prevented from being dragged. In addition, after the operation start control sensitivity blunting means reduces the hydraulic control sensitivity, the hydraulic control sensitivity is returned to the set sensitivity at the timing when the traveling machine travels a predetermined distance, and the control sensitivity return means after operation start returns the hydraulic control sensitivity. It can be suppressed that work is performed in a dull state. In addition, since the planting work machine is pressed against the scene by using the hydraulic control sensitivity adjustment means, not only can it be realized with a simple change in control, but also the pressing force is limited within the hydraulic control sensitivity adjustment range, and excessive pressing is possible. Damage to the planting machine due to
Further, according to the invention of claim 2, since the hydraulic control sensitivity is made duller than the set sensitivity when operating the sheet cutting means, the sheet cutting control sensitivity dulling means for pressing the planting work machine against the scene is provided. At the time of sheet cutting, the sheet can be firmly adhered to the eyebrow scene, and cutting defects caused by sheet slackness or floating can be prevented. In addition, after the sheet cutting control sensitivity blunting means reduces the hydraulic control sensitivity, the hydraulic control sensitivity is returned to the set sensitivity at the timing at which the planting work machine has risen. It can be prevented from staying dull.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole left side view of the multi transplantation machine which concerns on 1st Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is whole perspective view of the multi transplantation machine which concerns on 1st Embodiment of this invention. It is a principal part side view showing a sheet holding part and roller float of a multi transplantation machine concerning a 1st embodiment of the present invention. It is a principal part side view showing a sheet cutting mechanism of a multi transplantation machine concerning a 1st embodiment of the present invention. It is an important section sectional view showing a planting clutch of a multi transplant machine concerning a 1st embodiment of the present invention. It is a principal part side view showing a working machine control cam of a multi transplant machine concerning a 1st embodiment of the present invention. It is a principal part side view showing the connection structure of the roller float and hydraulic control valve of the multi transplantation machine concerning a 1st embodiment of the present invention. It is a front view showing an operation panel of a multi transplantation machine concerning a 1st embodiment of the present invention. It is a block diagram showing the control composition of the multi transplant machine concerning a 1st embodiment of the present invention. It is operation | movement explanatory drawing of the multi drag | drug prevention control of the multi transplantation machine which concerns on 1st Embodiment of this invention. It is a flowchart of the working machine operation control which the control part of the multi transplant machine which concerns on 1st Embodiment of this invention performs. It is a flowchart of the multi drag-prevention control which the control part of the multi transplant machine which concerns on 1st Embodiment of this invention performs. It is a flowchart of the control at the time of multi cutting which the control part of the multi transplantation machine which concerns on 1st Embodiment of this invention performs. It is a principal part side view of the multi transplantation machine concerning a 2nd embodiment of the present invention. It is a principal part rear view of the multi transplantation machine concerning a 2nd embodiment of the present invention.

  Hereinafter, a first embodiment of the present invention will be described based on the drawings. In FIG. 1 and FIG. 2, reference numeral 1 denotes a traveling machine body of a multi transplanting machine, and a planting machine 3 is connected to a rear portion of the traveling machine body 1 via a hydraulic lift mechanism 2. The hydraulic elevating mechanism 2 includes an elevating link mechanism 4 for elevatingly connecting the planting machine 3 to the rear of the traveling machine body 1 and a lift cylinder 5 interposed between the elevating link mechanism 4 and the traveling machine body 1. The planting work machine 3 is moved up and down according to the hydraulic expansion and contraction operation of the lift cylinder 5.

  The planting work machine 3 is a multi-specification for planting seedlings on the sheet S from above the sheet S while covering the area with the sheet S, and from the seedling platform 6 on which the mat seedlings are placed, and from the seedling platform 6 A planting mechanism 7 for scraping seedlings and planting them in a field, a roller float 8 (sensed float) for sensing the height of the planting work machine 3 with respect to a weir scene (hereinafter referred to as appropriate to ground height), and a sheet S The sheet holding portion 9 holds the sheet S so that it can be fed out, the sheet holder 10 that regulates the sagging of the sheet S when the planting work machine 3 ascends, and the sheet pressing roller 11 that presses the sheet S laid in the overhead scene against the overhead scene And a sheet cutting mechanism 12 (sheet cutting means) for cutting the sheet S laid in a loom scene at the end of the planting stroke, and a sheet breakage detection mechanism 13 for detecting a sheet breakage state where the sheet S to be fed out is lost. Composed , It carried out the planting work in planting power, which is the transmission from the vehicle body 1.

  The sheet holding unit 9 includes a sheet roll case 9a that rotatably accommodates a sheet S (hereinafter referred to as a sheet roll R) wound in a roll shape, and a cover 9b that covers the left and right sides of the sheet roll case 9a so as to open and close. And, as shown in FIG. 3, the sheet S is fed from the sheet roll R accommodated in the sheet roll case 9a. The sheet holding unit 9 does not have a mechanism for forcibly drawing out the sheet S, and uses the adhesion between the sheet S and the overhead scene to draw out the sheet S as the machine travels.

  The cover 9b opens and closes the left and right sides of the sheet roll case 9a when taking out the remaining roll core or inserting the spare sheet roll R. As shown in FIGS. 1 and 2, the multi-implantation machine of this embodiment supports the spare sheet rolls R on the left and right sides of the traveling machine body 1 and is outwardly rearward with the support shaft 14a at the rear end as a fulcrum. The spare sheet roll supporting device 14 is provided, and when the planting work machine 3 is lifted, when the spare sheet roll supporting device 14 is turned rearward and outward, the spare sheet roll R is a sheet roll. Since it moves to the side of case 9a, spare sheet roll R can be easily inserted in sheet roll case 9a.

  As shown in FIG. 1, the sheet holder 10 extends rearward from the lower portion of the sheet holding portion 9 along the lower side of the planting work machine 3 in a side view, and when the planting work machine 3 ascends The sag of the sheet S is restricted. The sheet holder 10 of the present embodiment is vertically pivotable with the front end side as a fulcrum, and works along the lower side of the planting work machine 3 according to the operation of the holder control lever 10a connected to the front end side It can be pivoted and changed to a position and a non-work position (position for manually feeding out the sheet S at the start of work, etc.) separated from the lower side of the planting work machine 3.

  As shown in FIG. 1, the sheet pressing roller 11 is disposed rearward of the roller float 8 in a side view, and presses the sheet S laid in the overhead scene against the overhead scene. By arranging a plurality of such sheet pressing rollers 11 so as to be positioned between the strips, floating and curling of the laid sheet S can be prevented.

  As shown in FIG. 1 and FIG. 4, the sheet cutting mechanism 12 is for cutting the sheet S laid in a weir scene at the end of the planting stroke, and the planting work machine 3 up and down with the front end side as a fulcrum Operation of the cutting arm 12a rotatably provided, the cutting blade 12b provided at the rear end of the cutting arm 12a, the cutting operation lever 12c provided so as to be able to operate back and forth at the rear of the traveling machine body 1, and the cutting operation lever 12c In accordance with this, the connecting wire 12d for rotating the cutting arm 12a up and down, and the cutting operation detection switch 12e for detecting the operation of the cutting operation lever 12c.

  As shown in FIG. 2, the sheet breakage detection mechanism 13 contacts the sheet breakage detection lever 13 a which can be rotated back and forth in contact with the sheet S fed from the sheet roll R, and the direction in which the sheet breakage detection lever 13 a is in contact with the sheet S ( And a sheet breakage detection switch 13c for detecting the rotational displacement of the sheet breakage detection lever 13a. As shown by an imaginary line in FIG. 2, when there is a sheet S to be fed out, the sheet out detection lever 13a receives the tension of the sheet S and is rotated backward, so the sheet out detection switch 13c is in the OFF state. However, when the sheet S to be fed out is exhausted, the sheet breakage detection lever 13a is pivoted forward, and the sheet breakage detection switch 13c is turned on to detect the sheet breakage state.

  An engine (not shown) and a transmission T are mounted on the traveling body 1. The power output from the engine is shifted by the transmission T and transmitted to the planting machine 3, the front wheels 15 and the rear wheels 16. A planting clutch C shown in FIG. 5 is internally provided in the transmission T, and transmission of planting power to the planting work machine 3 is entered based on engagement (connection) / disconnection (disconnection) of the planting clutch C. / Cut off.

  As shown in FIG. 6, the traveling machine body 1 is provided with a work implement operation cam 17 connected to the planting clutch C and the hydraulic pressure control valve 5 a of the lift cylinder 5. The work implement operating cam 17 is operated to each position of “rising”, “fixed”, “automatic (descending)”, and “planting” based on the drive of the work implement operating cam motor 18. Then, in the “rising” position, raise the planting work machine 3 (planting clutch C is off), and in the “fixed” position, fix the planting work machine 3 at an arbitrary height (planting clutch C In the "automatic (descent)" position, the planting work machine 3 is lowered (planting clutch C is turned off), and in the "planting" position, the planting clutch C is engaged. Further, in the “automatic (down)” and “planting” positions, mechanical hydraulic lift control for automatically lifting and lowering the planting work machine 3 based on the detection of the ground height of the roller float 8 is effective.

  As shown in FIG. 7, the above-described mechanical hydraulic lift control is performed by a hydraulic lift control mechanism 19 (hydraulic lift control means) comprising a link mechanism connecting the roller float 8 and the valve arm 5b of the hydraulic control valve 5a. To be executed. The roller float 8 of the present embodiment includes a pair of front and rear rollers 8 a and a connecting member 8 b that connects the pair of front and rear rollers 8 a, and the middle portion of the connecting member 8 b is connected to the hydraulic lift control mechanism 19. The vertical movement of the roller float 8 is transmitted to the valve arm 5b of the hydraulic control valve 5a.

  Further, the hydraulic lift control mechanism 19 is provided with a hydraulic control sensitivity adjustment mechanism 20 (hydraulic control sensitivity adjust means) for adjusting the hydraulic control sensitivity of the hydraulic lift control mechanism 19 with respect to the height detection by the roller float 8. The hydraulic control sensitivity adjustment mechanism 20 of the present embodiment includes a hydraulic control sensitivity adjustment motor 20 a and a connecting wire 20 b that changes the posture of the roller float 8 according to the drive of the hydraulic control sensitivity adjustment motor 20 a. For example, when adjusting the hydraulic control sensitivity to the sharp side (sensitivity adjustment for soft fields), the posture of the roller float 8 is set to the forward-down inclination position, and the oil pressure control sensitivity is adjusted to the blunt side (sensitivity adjustment for hard fields) In this case, the posture of the roller float 8 is inclined backward. Then, if the hydraulic control sensitivity is adjusted to the sharp side, the planting work device 3 is controlled to raise and lower the planting work device 3 to suppress the sinking of the planting work device 3 into the lapping scene, and the hydraulic control sensitivity is adjusted to the slow side. In order to suppress floating of the planting work machine 3 with respect to the mastication scene, the planting work machine 3 is vertically controlled to be lowered.

  As shown in FIG. 1, FIG. 2 and FIG. 8, at the upper part of the traveling machine body 1, a driving unit 21 on which the operator rides is configured, and in the driving unit 21, other than the driver's seat 22 where the operator sits An operation panel 24 provided with various operation tools and a monitor panel 23 is provided. The operation panel 24 includes a steering handle 25 for steering the front wheels 15, a work machine control lever 26 for raising and lowering the planting work machine 3 and an on / off operation of the planting clutch, and a main shift lever 27 for changing traveling speed. An operation tool such as a work preparation switch 28 which is turned on at the time of planting work is provided.

  As shown in FIG. 9, the traveling machine body 1 is provided with a control unit 29 that performs elevation control of the planting work machine 3 and on / off control (disconnection / disengagement control) of the planting clutch C. On the input side of the control unit 29, in addition to the cutting operation detection switch 12e, the out-of-sheet detection switch 13c, and the work preparation switch 28, a work machine operation switch (upper side) 30 for detecting the upper operation of the work machine operation lever 26; Work machine operation switch (lower side) 31 for detecting the lower operation of the work machine control lever 26, work machine operation cam potentiometer 32 for detecting the position of the work machine operation cam 17, and elevation height of the planting work machine 3 While the lift angle potentiometer 33 and the travel distance sensor 34 for detecting the rotation (travel distance) of the rear wheel power transmission path are connected, the output side of the control unit 29 is the work machine operation cam motor 18 described above, oil pressure control A sensitivity adjustment motor 20a or the like is connected.

  The control unit 29 is a functional configuration realized by the cooperation of hardware and software, including a control sensitivity reduction means at the start of work (multi drag prevention control described later) and a control sensitivity return means after the start of work (multi drag prevention described later). Control), sheet cutting control sensitivity decreasing means (multi-cutting control described later), and sheet post-cut control sensitivity returning means (multi-cutting control described later).

  At the start of operation, the control sensitivity blunting means makes the hydraulic control sensitivity duller than the set sensitivity by using the hydraulic control sensitivity adjustment mechanism 20 at the time of lowering or grounding of the planting machine 3 to the mastication scene, that is, starting the planting operation. Do. When the hydraulic control sensitivity is made slower than the set sensitivity, the planting work machine 3 is pressed against the eyebrow scene, so the pressing force of the sheet S by the sheet pressing roller 11 increases, and the sheet S can be firmly adhered to the eyelid scene As a result, it becomes possible to prevent the sheet S from being dragged at the beginning of the work. Moreover, since the planting work machine 3 is pressed against the overhead scene using the hydraulic control sensitivity adjustment mechanism 20, not only can it be realized by a simple change in control, but also the pressing force is limited within the hydraulic control sensitivity adjustment range. It is possible to prevent damage to the planting work machine 3 due to any pressing.

  After the start of work, the control sensitivity return means returns the hydraulic control sensitivity to the set sensitivity at the timing when the traveling machine body 1 travels a predetermined distance L1 (see FIG. 10) after the work start control sensitivity blunting means slows down the hydraulic control sensitivity. . According to such control sensitivity return means after start of operation, the hydraulic control sensitivity returns to the set sensitivity at an appropriate timing after the start of planting, so that it is possible to suppress that the operation is performed in the state where the hydraulic control sensitivity remains sluggish .

  When the sheet cutting mechanism 12 is operated, the sheet cutting control sensitivity lowering means presses the planting work machine 3 against the dredging scene by making the oil pressure control sensitivity duller than the set sensitivity. According to such a sheet cutting control sensitivity reducing means, the sheet S can be reliably brought into close contact with the bag scene at the time of sheet cutting, and it is possible to prevent a cutting defect due to the slack or floating of the sheet S.

  The control sensitivity returning means after sheet cutting returns the hydraulic control sensitivity to the set sensitivity at the timing when the planting work machine 3 rises after the sheet cutting control sensitivity blunting means reduces the hydraulic control sensitivity. According to such control sensitivity returning means after sheet cutting, it is possible to prevent the hydraulic control sensitivity from remaining dull.

  Next, a control procedure of the control unit 29 for realizing the functional configuration as described above will be described with reference to FIGS.

  As shown in FIG. 11, in the work machine operation control, first, the lower side operation and the upper side operation of the work machine operation lever 26 are determined (S101, S102). Here, if it is determined that the lower operation of the work implement operation lever 26 has been made, it is then determined whether the work preparation switch 28 is turned on / off (S103). If the judgment result is ON, the state of the planting work machine 3 is judged (S104 to S106), and if the state of the planting work machine 3 is "rise", the work machine operating cam 17 is fixed And the raising operation of the planting machine 3 is stopped. In addition, when the state of the planting work machine 3 is "automatic (descent)", it is determined whether or not the planting clutch restriction flag is OFF (S108). While returning to the routine, if the result of the determination is YES, it is determined whether or not the descent operation stop state (ground state) (S109). If the determination result is NO, the planting clutch is in a waiting state (S119). If the determination result is YES, the work implement operating cam 17 is switched to the "planting" position and the planting clutch C is Turn on (S111). When the state of the planting work machine 3 is "fixed", the work machine operating cam 17 is switched to the "automatic (descent)" position (S112), and the state of the planting work machine 3 is "planting" Returns to the upper routine as it is.

  Moreover, also when the judgment result of step S103 is OFF, the state of the planting work machine 3 is judged (S113, S114), and when the state of the planting work machine 3 is "rise" here, the work machine operation cam Switch 17 to the "fixed" position (S107), and stop the raising operation of the planting work machine 3. When the state of the planting work machine 3 is "fixed", the work machine operating cam 17 is switched to the "automatic (descending)" position (S115), and the state of the planting work machine 3 is other than "rise" And if it is other than "fixed", it returns to the upper routine as it is.

  On the other hand, if it is determined in step S102 that the upper side of the work implement control lever 26 has been operated, the state of the planting work machine 3 is determined (S115 to S117), and the state of the planting work machine 3 is "fixed" In the case of “1”, the work implement operating cam 17 is switched to the “rising” position (S119), and the planting work implement 3 is raised. When the state of the planting work machine 3 is "planting", the work machine operating cam 17 is switched to the "automatic (descending)" position, and the planting clutch C is turned off (S120). In addition, when the state of the planting work machine 3 is "automatic (descending)", it is determined whether the planting work machine 3 is in the descent operation stop state (S121), and the judgment result is YES Switch the work implement operating cam 17 to the "rising" position (S119) and raise the planting work implement 3, while if the determination result is NO, switch the work implement operating cam 17 to the "fixed" position (S122) , The lifting operation of the planting work machine 3 is stopped.

  In addition, it is judged whether or not the planting clutch restriction flag is OFF when the upper side operation and the lower side operation of the work machine operation lever 26 are not performed (S123), and if the result of this judgment is YES, the planting clutch While it is judged whether it is in the waiting-for-entry state (S124), it is judged whether the descent operation stop state of the planting machine 3 is (S125). If both determination results are YES, the work implement operating cam 17 is switched to the "planting" position and the planting clutch C is engaged (S126). Otherwise, the process returns to the upper routine as it is.

  Moreover, also when the judgment result as to whether or not the planting clutch restriction flag is OFF is NO, the state of the planting work machine 3 is judged (S127), and the state of the planting work machine 3 is "planting" In the case of “Apply”, switch the work implement operating cam 17 to the “automatic (down)” position and turn off the planting clutch C (S128), but when the state of the planting work machine 3 is other than “planting” Returns to the upper routine as it is.

  As shown in FIG. 12, in the multi drag prevention control, it is first determined whether or not the multi planting work state is based on the ON / OFF states of the work preparation switch 28 and the out-of-sheet detection switch 13 c (S201, S202 ). That is, when the work preparation switch 28 is ON and there is a sheet S to be fed out, it is judged that the multi planting work is in progress, and the process proceeds to the next step S203. If there is not, after resetting all flags and count values (S204), the process returns to the upper routine.

  In step S203, it is determined whether or not the position of the work implement operating cam 17 has changed from "fixed" to "automatic (descending)". If the determination result is YES, it is determined that the planting work is started, and the hydraulic control sensitivity is adjusted to the slowest and most insensitive value, and the count flag is turned ON (S205). As a result, the planting work machine 3 can be pressed against the mastication scene, and the sheet S can be reliably adhered to the mastication scene.

  If the determination result in step S203 is NO, it is determined whether the vehicle is traveling (S206), and it is determined whether the count flag is ON (S207). That is, the vehicle traveling state after lowering the hydraulic control sensitivity is determined, and if any of the determination results is YES, the detected traveling distance L is accumulated (S208), and the traveling distance L is set to the set distance L1. The comparison is made (S209). When it is determined that the traveling distance L is equal to or greater than the set distance L1, the count of the traveling distance L is cleared, the count flag is turned OFF, and the hydraulic control sensitivity is returned to the set value (S210). Thus, it is possible to suppress that the planting operation is performed in a state where the hydraulic control sensitivity remains low.

  As shown in FIG. 13, in the multi-cut time control, it is first determined whether or not the multi-planting work state is based on the ON / OFF states of the work preparation switch 28 and the out-of-sheet detection switch 13 c (S301, S302 ). That is, when the work preparation switch 28 is ON and there is a sheet S to be fed out, it is judged that the multi planting work is in progress, and the process proceeds to the next step S303. If there is no, return to the upper routine.

  In step S303, it is determined whether the position of the work implement operating cam 17 is "automatic (descent)" or "planting". If the judgment result is "yes", the cutting operation of the seat S is judged (S304), and if the judgment result is also "yes", the hydraulic control sensitivity is adjusted to the slowest insensitive value (S305). As a result, the planting work machine 3 can be pressed against the eyebrow scene and the sheet S can be firmly adhered to the eyelid scene, so that cutting defects of the sheet S due to slack or floating of the sheet S can be prevented Become.

  On the other hand, if the result of the determination in step S303 is NO, it is determined whether the position of the work implement operating cam 17 is "rising" (S306). That is, the raising operation of the planting work machine 3 after the cutting operation of the sheet S is judged, and when the judgment result is YES, the hydraulic control sensitivity is returned to the set value (S307). This can prevent the hydraulic control sensitivity from remaining sluggish.

  According to the present embodiment configured as described above, when lowering or grounding the planting work machine 3 to the eyebrow scene, the planting work machine 3 is set as the eyebrow scene by making the hydraulic control sensitivity duller than the set sensitivity. Since the control sensitivity decreasing means at the start of the pressing operation is provided, the sheet S can be reliably brought into close contact with the eyelid at the beginning of the operation, and the dragging of the sheet S can be prevented.

  Further, after the operation start control sensitivity reducing means reduces the oil pressure control sensitivity, the oil pressure control sensitivity is returned to the set sensitivity at the timing when the traveling body 1 travels by the predetermined distance L1. It is possible to suppress that work is performed in a state where the control sensitivity remains dull.

  Moreover, since the planting work machine 3 is pressed against the overhead scene using the hydraulic control sensitivity adjustment mechanism 20, not only can it be realized by a simple change in control, but also the pressing force is limited within the hydraulic control sensitivity adjustment range. It is also possible to prevent the planting work machine 3 from being damaged by pressing.

  In addition, since the sheet cutting mechanism 12 is equipped with a sheet cutting control blunting means for pressing the planting work machine 3 against the setting scene by making the oil pressure control sensitivity duller than the setting sensitivity when operating the sheet cutting mechanism 12, The sheet S can be firmly adhered to the scene to prevent the cutting failure caused by the slack or floating of the sheet S.

  In addition, after the sheet cutting control sensitivity blunting means makes the hydraulic control sensitivity dull after the sheeting control device is lowered, the control sensitivity returning means after sheet cutting returns the hydraulic control sensitivity to the set sensitivity at the timing when the planting work machine 3 rises. Can be prevented from remaining dull.

  Next, a multi-implanter according to a second embodiment of the present invention will be described with reference to FIGS. 14 and 15. FIG. However, about the composition which is common in a 1st embodiment, the explanation of a 1st embodiment is used by using the same numerals as a 1st embodiment.

  As shown in FIGS. 14 and 15, in the multi-transplanter of the second embodiment, a water tank 101 for storing water, a water discharge nozzle 102 disposed along the base of the cutting blade 12b, and the inside of the water tank 101. And a pump 104 for delivering water to the water discharge nozzle 102 via a hose 103, which is different from the first embodiment.

  In the multi transplant device of the second embodiment, when the cutting operation lever 12 c is operated, the pump 104 is driven according to the detection signal of the cutting operation detection switch 12 e, and the water in the water tank 101 is supplied with water via the hose 103. It is sent to the discharge nozzle 102. The water discharge nozzle 102 has a plurality of water discharge ports 102a aligned in the left-right direction via a predetermined interval, and the water discharged from the water discharge ports 102a flows along the cutting blade 12b to cut the sheet S. Wet the position. As a result, the sheet S is easily cut, and cutting defects of the sheet S can be prevented.

  The present invention is not limited to the above embodiment, and various modifications and changes can be made within the scope of the subject matter of the present invention described in the claims.

DESCRIPTION OF SYMBOLS 1 traveling body 2 hydraulic lift mechanism 3 planting work machine 7 planting mechanism 8 roller float 9 sheet holding portion 12 sheet cutting mechanism 17 work machine operation cam 18 work machine operation cam motor 19 hydraulic lift control mechanism 20 hydraulic control sensitivity adjustment mechanism 21 operation Part 26 Working machine control lever 28 Work preparation switch 29 Control part 34 Travel distance sensor

Claims (2)

A multi-transplanter comprising a planting work machine connected to a rear portion of a traveling machine body so as to be capable of moving up and down, and covering a weir scene with a sheet according to traveling of the traveling machine body and planting seedlings on the sheet from the top of the sheet to the field.
The planting machine is
A sheet holding unit that holds a sheet so as to be able to be fed out;
Planting mechanism to plant seedlings in the field,
And a sensing float that senses the height of the planting machine with respect to a crawling scene;
The traveling airframe is
A hydraulic lift mechanism that raises and lowers the planting work machine;
Hydraulic lift control means for automatically controlling the height of the planting machine with respect to the scene based on operation control of the hydraulic lift mechanism according to height detection by the sense float;
Hydraulic control sensitivity adjustment means for adjusting the hydraulic control sensitivity of the hydraulic lift control means to the height sensing by the sensing float;
When the hydraulic control sensitivity is made slower than a set sensitivity when lowering or grounding the planting work machine to the mastication scene, a control start-time control dulling means for pressing the planting work machine against the mastication scene;
The control sensitivity returning means for returning the hydraulic control sensitivity to the set sensitivity at the timing at which the traveling body travels a predetermined distance after the control start time desensitization means reduces the hydraulic control sensitivity. A multi porting machine characterized by A sheet cutting means operated at the end of the planting operation stroke to cut the end of the sheet delivered to the field;
Sheet cutting control sensitivity blunting means for pressing the planting work machine against an eyebrow scene by making the hydraulic control sensitivity duller than the set sensitivity when operating the sheet cutting means;
The sheet cutting control sensitivity returning means for returning the oil pressure control sensitivity to the setting sensitivity at a timing when the planting work machine rises after the sheet cutting control sensitivity blunting means reduces the oil pressure control sensitivity. The multi-implanter according to claim 1, characterized in that

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