JP2010178717A - Transplanter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide such a transplanter that a raising switch or the like to raise a planting machine is equipped on a variable-speed operating implement capable of opting the back-and-forth traveling of the machine body and setting the traveling speed, designed to eliminate such trouble that a planting clutch turns off along with an operation that the planting machine rises when the raising switch is mispressed during operating the variable-speed operating implement. <P>SOLUTION: The transplanter has such a construction: the grip 31a of a variable-speed implement 33 is equipped with a raising-operating switch 38 which can conduct approximately simultaneously the turning-off operation of a planting clutch and the operation of raising a planting machine 5; and an operating-state-detective means 33 capable of detecting the operating state of the variable-speed operating implement 31; and a lift control means 51 is incorporated, functioning to restrain the rise of the planting machine 5 by operating the raising-operating switch 38, based on the detection of variable-speed operation of the implement 31 during the planting operation of the means 33. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention belongs to the technical field of transplanting machines such as a riding rice transplanter in which a planting work machine is connected to a rear part of a machine body through a link mechanism so as to be movable up and down. The present invention relates to a transplanting machine in which a shift operation tool that can be set is provided with an elevating switch for raising and lowering a planting work machine.

  In a conventional rice paddy machine, as an example of an operation tool that can be used to raise and lower a planting work machine and to turn a planting clutch on and off, if you release your hand near the right and left sides (right side) of the steering wheel, A quick-up lever that automatically returns to the original position (neutral position) is provided. By operating the quick-up lever in the vertical direction, the planting machine is moved up and down and the planting clutch is turned on and off. There has been known one configured so that the direction of the left and right line drawing markers can be selected (see, for example, Patent Document 1).

  In addition, a push switch, a raising switch, a lowering switch, and a lowering / working switch are provided on a gripping part (grip part) of a shift lever that performs a shifting operation of a hydrostatic continuously variable transmission for traveling (HST for traveling). These up / down switch on / off operation signals are output to the solenoid valve of the up / down control valve via the control unit to raise and lower the planting work machine, and the down / work switch on / off operation signal Similarly, output to the solenoid valve of the lift control valve via the control unit, and output to the actuator linked to the PTO clutch (planting clutch), thereby lowering the planting work machine and the PTO clutch engaging operation A riding type rice transplanter that has been made possible is known (see, for example, Patent Document 2).

JP 2003-88213 A (page 3-5, FIGS. 5 and 9) Japanese Patent Laying-Open No. 2007-37462 (page 3-4, FIG. 3)

  However, in the planting work in the field by the above-described riding type rice transplanter of Patent Document 1, the operator first releases the left hand from the steering wheel that is being gripped and operated with both hands immediately before the planting of the forward path or the return path is completed. After gripping the speed change lever with this left hand and decelerating the traveling speed, grip the steering wheel again, then release the right hand from the steering wheel and operate the quick-up lever upward with this right hand. The planting machine is automatically lifted by disengaging the attached clutch and operating the quick up lever with the right hand once more, and then the steering wheel is re-gripped with both hands and the aircraft is turned. There was room for improvement in terms of maneuverability because it was necessary to carry out rough maneuvering operations.

  In addition, the riding type rice transplanter disclosed in Patent Document 2 shifts the traveling speed by collectively providing a push button type raising switch, a lowering switch, and a lowering / working switch on the gripping part (grip part) of the transmission lever. This allows the user to quickly perform a series of operations, ranging from the lifting operation of the planting machine to the lifting / lowering operation of the planting clutch and the switching operation of the planting clutch without releasing (holding) from the gripping portion of the transmission lever. In this case, when the operator performs an operation of shifting the traveling speed by gripping the grip portion of the speed change lever, there is a possibility that the raising switch, the lowering switch, and the lowering / working switch may be erroneously pressed. After confirming the stable state of planting work started at a low speed, when the shift lever is operated to shift the traveling speed from a low speed to a high speed, the raising switch is accidentally pressed. Mau the planting the planting work machine with clutch expires has been a problem such that the operation increases.

In order to solve the above problems, the present invention includes a hydraulic cylinder that moves up and down a planting machine connected to the rear part of the machine body via a link mechanism, and a hydraulic control valve that controls expansion and contraction of the hydraulic cylinder. And a single operation tool that can be used to raise and lower the planting work machine and an operation to turn on and off the planting clutch, and a speed change operation tool that selects the forward and backward travel of the machine body and sets the traveling speed, In the transplanting machine that performs the planting work by lowering the planting work machine until the leveling float provided in the lower part of the plant is in contact with the field scene, the planting clutch is turned off and the planting work is performed on the grip portion of the speed change operation tool. A lifting operation switch that can perform the lifting operation of the machine at substantially the same time is provided, and an operation state detection means that can detect the operation state of the transmission operation tool is provided, and the change of the transmission operation tool during the planting operation of the operation state detection means is provided. Based on the detection of the operation, and the first, characterized in that have configured elevation control means for restraining an increase in planting work machine by the operation of the rising operation switch.
Then, after the operation state detecting means detects the first speed increasing operation to the forward side of the speed change operation tool when the planting clutch is engaged, the planting work machine is operated by operating the ascending operation switch until a predetermined time elapses. The second feature is that the elevating control means is configured so as to restrain the ascent of the vehicle.
Furthermore, when the speed increasing operation to the forward side of the body is performed by the speed change operation tool, a third lifting control means is configured so as to check the lifting of the planting work machine due to the operation of the lifting operation switch. It is a feature.

According to invention of Claim 1, the single operation tool which can perform the raising / lowering operation of a planting work machine, and the on / off operation of a planting clutch, the speed change operation tool which sets selection of the forward / backward travel of a body, and traveling speed In the transplanting machine which performs the planting work by lowering the planting work machine until the leveling float provided at the lower part of the planting work machine contacts the field scene, the planting clutch And a lifting operation switch that can perform the lifting operation of the planting work machine at substantially the same time and an operation state detection means that can detect the operation state of the speed change operation tool. Based on the detection of the shifting operation of the shifting operation tool in the middle, the elevating control means for restraining the lifting of the planting work machine due to the operation of the lifting operation switch is configured. Grab the grip and run the aircraft Even when the lifting operation switch is accidentally pressed and the operation signal (pressing signal) is input to the lifting control means of the planting machine, the planting clutch is inadvertently disconnected and planting. It will be possible to check to prevent problems such as the work machine rising.
According to the invention of claim 2, after the operation state detecting means detects the first speed increasing operation to the forward side of the speed change operation tool when the planting clutch is engaged, the operation state detecting means rises until a predetermined time elapses. Since the lifting control means is configured to restrain the raising of the planting work machine due to the operation of the operation switch, the lifting operation is performed when the speed increasing operation of the machine is performed with the speed change operation tool immediately after the planting work traveling is started. It is possible to prevent the planting clutch from being inadvertently disconnected due to an erroneous operation of the switch, and the planting work machine to rise. That is, after confirming the stable state of the planting work that started the aircraft at a low speed, the predetermined time does not elapse when the speed of the aircraft is increased from a low speed to a high speed by operating the speed change operation tool. Therefore, the raising / lowering control means does not accept the operation signal of the raising operation switch. Therefore, at this shift operation timing, even if the raising operation switch is accidentally pressed, the planting clutch is disconnected and the planting work machine is not raised. On the other hand, at the end of planting work travel, while operating the speed change operation tool to decelerate the traveling speed of the aircraft, press the lifting operation switch to disengage the planting clutch and raise the planting work machine acceptable.
Further, according to the invention of claim 3, when the speed increasing operation to the forward side of the machine body by the speed change operation tool, the elevating control means is provided so as to check the ascent of the planting work machine due to the operation of the ascending operation switch. Therefore, the planting clutch is disengaged even when the speed increasing operation to the forward side of the aircraft is performed by the speed change operation tool or even if the ascending operation switch is accidentally pressed during the speed increasing operation. Therefore, there will be no problem that the planting machine moves up. On the other hand, when the shifting operation tool is operated and the traveling of the transplanter is stopped, the planting work machine is operated by pressing the lifting operation switch without releasing (holding) the gripping part of the shifting operation tool. Can be quickly moved up, so that the operability is excellent.

The side view of a riding type rice transplanter. The top view of a riding type rice transplanter. The side view which shows the linkage structure of the main transmission lever. The top view of an operation panel. FIG. The perspective view which shows the operation method of a quick up lever. The side view which shows the structure of a hydraulic control valve periphery. The block diagram of a control part. The side view which shows the whole structure of a hydraulic-pressure detection control mechanism. The flowchart (Example 1) which shows the forced raising / lowering control of a planting work machine. The flowchart (Example 2) which shows the forced raising / lowering control of a planting work machine.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 are side view plan views of a riding type rice transplanter 1 which is an example of a transplanting machine, and a hydraulic cylinder 3 which is an actuator is provided at the rear part of the body frame 2 of the riding type rice transplanting machine 1. An elevating link mechanism 4 is provided, and a planting work machine 5 as a work machine is connected through the elevating link mechanism 4 so as to be movable up and down, and a pair of left and right front wheels 6 and a rear wheel are connected to the lower part of the body frame 2. 7 is provided.

  A bonnet 8 that covers the engine E and the like is provided at the front of the body frame 2, and the power output from the engine E is transmitted to the hydrostatic continuously variable transmission H (see FIG. 3) and the transmission case T. This power transmission device is configured to be branched into a traveling transmission system and a planting transmission system and transmitted to the pair of left and right front wheels 6 and rear wheels 7 and the planting work machine 5. A hydraulic pump (not shown) that is driven by the power of the engine E is provided on one side of the transmission case T. A hydraulic control valve 43 (see FIG. 6), which will be described later, is provided by pressure oil supplied from the hydraulic pump. The expansion / contraction operation of the hydraulic cylinder 3 is controlled via

  In addition, a seat 9 on which an operator is seated is provided above the rear part of the body frame 2, and an operation panel 11 for displaying various monitors is provided in front of the seat 9, and an operation panel 11 is operated above the operation panel 11. A steering wheel 12 that is a direction operation tool, and a step 14 that forms a floor surface of the steering unit 13 are provided below the steering wheel 12.

  More specifically, a link holder 15 having a rolling shaft (not shown) is attached to the rear end of the elevating link mechanism 4, and a square pipe-shaped planting that supports the planting work machine 5 is attached to the rolling shaft. The frame 16 is supported so as to freely roll. A pair of left and right seedling stage support frames 17 erected on the planting frame 16 support the seedling stage 18 so as to be able to reciprocate left and right in a front and rear low-tilt posture.

  Further, a plurality of planting transmission cases 19 are attached to the rear lower portion of the planting frame 16 with a predetermined left-right interval, and a chain transmission mechanism (not shown) and planting incorporated in the planting transmission case 19 A pair of transplanting rods 22 provided in the planting device 21 assembled at the rear end portion of the planting transmission case 19 is driven to rotate through a drive shaft or the like. That is, the planting device 21 is equipped with a planetary gear mechanism (not shown) that can rotate the transplantation cage 22 along a predetermined locus along with its own rotation. One seedling is scraped from the mat mat seedlings placed side by side and can be continuously transplanted to the field.

  Further, below the planting transmission case 19, a center float 23 (see FIG. 9) that acts as a hydraulic pressure sensing float that controls the planting work machine 5 to a desired height and also serves as a leveling float for leveling a farm scene. And the side float 24 which is a leveling float for leveling the field scene by removing the wheel marks of the left and right front wheels 6 and the rear wheel 7, and the lower surfaces of the center float 23 and the side float 24 are in contact with the field scene. After the planting work machine 5 is lowered to the state, the transplanting work can be performed while the machine is running.

  In the space S between the rear wheel 7 and the center float and the side float 24 described above, that is, in front of the planting work machine 5, a plurality of leveling rotors 25 are attached to the rotor shaft 26 over substantially the entire width of the planting work machine 5. A supported leveling device 27 is disposed, and the leveling rotor 25 is driven to rotate in a state where it is grounded to the field scene. It is possible to level the field.

  Further, on the left side of the operation panel 11 (in the vicinity of the steering wheel 12), a main transmission lever 31 as a transmission operation tool is provided by being inserted into the lever guide 32, and a transmission case T is disposed below the main transmission lever 31. is doing. A hydrostatic continuously variable transmission H is attached to the left side surface of the transmission case T, and the traveling speed of the airframe is configured in the main transmission by the hydrostatic continuously variable transmission H and in the transmission case T. It is determined by sub-shifting by switching the sub-transmission gear (sub-transmission mechanism). The main transmission lever 31 is configured to be able to perform a shifting (swinging) operation while holding the grip portion 31a with the left hand.

  More specifically, a main transmission lever potentiometer (operation state detecting means) capable of detecting a shift operation position (operation state) from the forward side to the reverse side of the main transmission lever 31 is provided at the base end portion of the main transmission lever 31. 33, and the operation arm for operating the operation arm 34 of the hydrostatic continuously variable transmission H in conjunction with the detection result of the shift operation position of the main transmission lever 31 by the main transmission lever potentiometer 33. 34, the rod side 36a of the electric cylinder 36 is connected via the rod 35, while the motor unit side 36b of the electric cylinder 36 is supported by the mounting member 37 of the lever guide 32 described above. Reference numeral 36 c in the figure is a stroke sensor that detects the expansion / contraction stroke of the electric cylinder 36.

  Then, as shown in FIG. 4, the shift operation of the hydrostatic continuously variable transmission H is performed by swinging the main transmission lever 31 back and forth and right and left along a guide groove 32 a formed in the lever guide 32. Be able to. That is, the main transmission lever 31 operates the operation arm 34 of the hydrostatic continuously variable transmission H to the forward side by operating it forward from the neutral position where the hydrostatic continuously variable transmission H is neutral. By increasing the forward speed and operating the main transmission lever 31 from the neutral position to the rear side, the operating arm 34 of the hydrostatic continuously variable transmission H can be operated backward to increase the reverse speed. It is like that.

  Therefore, the guide groove 32a formed in the lever guide 32 moves the forward operation region F and the reverse operation region R of the guide groove 32a to the left and right so that the forward movement and the backward operation of the machine body by the main transmission lever 31 are not continuous operations. The operation areas F and R are connected by a neutral area N while being offset in the direction. The main transmission lever 31 can be swung left and right along the lever guide 32 while the hydrostatic continuously variable transmission H is kept in the neutral state in the neutral region N.

  Further, as shown in FIGS. 4 and 5, the grip 31a of the main speed changer 31 that is shifted (swinged) with the left hand has a grip 31a with the left hand as shown in FIGS. However, a lifting operation switch 38 that can be pressed with its thumb is provided, and by pressing this lifting operation switch 38, an unillustrated planting clutch (not shown) that transmits power to the planting work machine 5 and a planting operation are provided. The lifting operation of the auxiliary work machine 5 can be performed substantially simultaneously.

  Further, as shown in FIG. 6, as a single operating tool capable of swinging up and down and back and forth, which can perform the lifting operation of the planting work machine 5 and the switching operation of the planting clutch, the vicinity of the steering wheel 12 A quick-up lever 41 is provided as a first operating tool that automatically returns to the original position (neutral position) when the hand is released on the right side, and the planting work machine 5 is operated by operating the quick-up lever 41 in the vertical direction. As shown in FIG. 1, the planting clutch (not shown) is turned on and off, and the swinging direction (operation start order) of the left and right drawing markers (not shown) can be selected by operation in the front-rear direction.

  Then, as shown in FIG. 7, in the vicinity of the hydraulic control valve 43 that controls the expansion and contraction operation of the hydraulic cylinder 3 that raises and lowers the planting work machine 5, the above-described operation of the quick-up lever 41 above or below is performed. A lifter cam motor 44 that is driven to rotate is disposed, and a pinion gear 44a fixed to an output shaft of the lifter cam motor 44 and a sector gear 45a formed on one side of the lifter cam 45 are engaged with each other and are not shown. A first cam portion that engages with the engagement pin of the valve operating plate is provided in the lifter cam 45, and the lifter cam 45 rotates around the sleeve shaft 46 with the first cam portion engaged with the engagement pin of the valve operating plate. By configuring the lifter cam 45 to move, the lifter cam 45 is raised / fixed / automatically lowered / planted according to the rotational drive of the lifter cam motor 44. It is configured so as to be controlled to move 4 positions. In other words, the hydraulic control valve 43 is raised, fixed, and automatically controlled by rotating the lifter cam 45 to each position, and the planting clutch (not shown) is turned on and off by the quick up lever 41 when the hydraulic control valve 43 is lowered. Enables operation.

  Moreover, the riding type rice transplanter 1 is provided with the control part 51 which comprises the raising / lowering control means of the planting work machine 5 like the block diagram shown in FIG. The control unit 51 includes a microcomputer including a CPU, a ROM, a RAM, and the like. Various sensors and switches connected to the input side of the control unit 51 and an output device connected to the output side will be described below.

  On the input side of the control unit 51, a work preparation switch 52 that enables on / off operation of a planting clutch that transmits power to the planting work machine 5, and above or below the quick-up lever 41 that is the first operation tool. A first operation tool raising switch 53 and a first operation tool lowering switch 54 for detecting the operation of the first operation tool, a raising operation switch (second operation tool raising switch) 38 as a second operation tool provided in the grip portion 31a of the main transmission lever 31, A planting work machine 5 provided at the base of the main transmission lever potentiometer 33 and the elevating link mechanism 4 as an operation state detecting means capable of detecting a shift operation position (operation state) from the forward side to the reverse side of the main transmission lever 31. Lift angle potentiometer 56 for detecting the rising height of the lifter, lifter cam potentiometer 57 for detecting the rotation angle of the lifter cam 45, and a main transmission lever as will be described in detail later. 1 is connected via a predetermined input interface circuit to a time setting dial 58 which is set so as not to accept the operation signal of the ascending operation switch 38 after a predetermined time has elapsed after performing the speed change operation according to 1. On the output side, a lifter cam motor 44 that is driven to rotate based on the on operation of the first operation tool raising switch 53 and the first operation tool lowering switch 54 or the second operation tool raising switch 55 is provided with a predetermined output interface circuit. Connected through.

  By the way, a plate-like base 62 extends rearward from the mounting bracket 61 of the hydraulic control valve 43 provided on the left and right sides of the body frame 2 below the seat 9, and the lifter cam motor 44 is attached to the base 62. 4 and 9, a sensing wire motor 65 that adjusts the output amount of the center float 23 (float sensitivity adjusting wire 64) in conjunction with a change in the setting of the hydraulic sensitivity adjusting dial 63 is mounted, and A sector gear 67 that meshes with a pinion gear 66 provided in the sensing wire motor 65 is pivotally attached. Furthermore, pins 68 and 69 are fixed at both ends in the rotational direction of the sector gear 67, and the hydraulic control valve interlocking wire 71, the linkage link 72, the return spring from the rear pin 68 of these pins 68 and 69 are provided. 73 is connected to the operating arm 74 of the hydraulic control valve 43 through the pin 73, and the front pin 69 of the pins 68 and 69 is connected to the center float 23 through the float sensitivity adjusting wire 64, the sensing plate 75, and the like. The hydraulic pressure sensing mechanism D is configured by connecting.

  More specifically, by operating the hydraulic control valve 43 in conjunction with the hydraulic sensing mechanism D to the center float 23 that swings following the field at the automatic position of the hydraulic control valve 43 described above, The planting work machine 5 is configured to be lifted and lowered so as to keep the posture constant. That is, if the hydraulic control valve 43 is in the automatic position and the center float 23 is not in contact with the field, the front end side of the center float 23 swings downward and the planting work machine 5 is lowered. The lowering of the planting work machine 5 from the grounded state of the center float 23 uses the lowering operation at the automatic position of the hydraulic control valve 43.

  Next, the forced raising / lowering control of the planting work machine 5 performed by the control unit 51 described above will be described based on the flowchart shown in FIG.

  First, in step S1, the lifter cam potentiometer 57 that detects the rotation angle of the lifter cam 45 determines whether or not the planting work machine 5 is rising. Proceeding to S3, the set value (timer) of the time setting dial 58 described above is reset. Further, even if the planting work machine 5 is not being lifted, if the work preparation switch 52 that enables on / off operation of the planting clutch that transmits power to the planting work machine 5 in step S2 is turned off, the step is performed. Proceeding to S3, the setting value of the time setting dial 58 is reset, and if the work preparation switch 52 is in the ON state, the process proceeds to Step S4.

In step S4, the lifter cam potentiometer 57 determines whether or not the position of the lifter cam 55 is at the planting position. If it is in the planting work state in which the plant is grounded and the planting clutch is engaged, the process proceeds to step S5, and if the position of the lifter cam 55 is other than the planting position, the process proceeds to step S8.

  In step S5, whether or not the main transmission lever 31 has been accelerated at the operation position on the forward side by the main transmission lever potentiometer 33 that can detect the transmission operation position from the forward side to the reverse side of the main transmission lever 31. Specifically, the first speed increasing operation by the main shift lever 31 after the planting clutch is engaged, that is, at the start of the planting work traveling where the traveling speed of the aircraft is started at low speed, the stable state of the planting work is confirmed. After that, when the speed increasing operation by the speed change lever 31 is performed, the routine proceeds to step S6, where it is determined whether or not the setting value (timer) of the time setting dial 58 has been reset. If it has been reset, the process proceeds to step S7, and if the set value of the time setting dial 58 has not been reset, the process proceeds to step S8.

  In step S7, a timer set by the time setting dial 58 is set and the process proceeds to step S8. In step S8, a lifting operation switch (second operation tool) that is a second operation tool provided in the grip portion 31a of the main transmission lever 31 is set. It is determined whether or not the operation tool raising switch 38 is pressed. If the raising operation switch 38 is pressed, the process proceeds to step S9.

  In step S9, the lifter cam potentiometer 57 determines whether or not the position of the lifter cam 55 is at the planting position, and the center float 23 provided at the planting position, that is, at the lower portion of the planting work machine 5, is installed. If it is not in the planting operation state where it contacts the farm scene, the process proceeds to step S10. If the lifter cam 55 is in the planting position and the center float 23 is in the planting operation state where it contacts the farm scene, the process proceeds to step S11. move on.

  In step S10, the lifter cam potentiometer 57 determines whether the position of the lifter cam 55 is in the “up” or “down” position, that is, whether or not the planting work machine 5 is being automatically raised and lowered. If it is raising / lowering, it will progress to step S11, and if the planting work machine 5 is not raising / lowering automatically, it will return.

  In step S11, it is determined whether or not the predetermined time of the timer set in step S7 has elapsed. If the predetermined time of the timer has elapsed, the process proceeds to step S12 and the planting work machine 5 is raised. Execute control.

  According to the forced raising / lowering control of the planting work machine 5 by the control unit 51 of the first embodiment described above and the device configuration of the transplanting machine (passenger type rice transplanter) 1, the planting work machine is located near one side of the left and right sides of the steering wheel 12. 5 is provided with a single operation tool (quick up lever) 41 that can perform up and down operations and a planting clutch on / off operation. A shifting operation tool (main transmission lever) 31 to be set is disposed, and the planting work machine 5 is lowered to a state where the leveling floats 23 and 24 provided at the lower part of the planting work machine 5 are in contact with the field scene, so that the planting work is performed. In the transplanter (passenger type rice transplanter) 1 that performs the above operation, the gripping portion 31a of the speed change operation tool 31 is provided with a lifting operation switch 38 that can perform the cutting operation of the planting clutch and the lifting operation of the planting work machine 5 substantially simultaneously. And before An operation state detecting means (main transmission lever potentiometer) 33 capable of detecting the operation state of the speed change operation tool 31 is provided, and based on detection of the speed change operation of the speed change operation tool 31 during the planting work of the operation state detection means 33, Since the raising / lowering control means 51 which checks the raising of the planting work machine 5 due to the operation of the ascending operation switch 38 is configured, the traveling speed of the machine body is grasped by holding the holding part 31a of the speed change operation tool 31 during the planting work. Even when the raising operation switch 38 is accidentally pressed and the operation signal (pressing signal) is input to the elevation control means 51 of the planting work machine 5, the planting clutch is inadvertently disconnected. The planting work machine 5 can be restrained so as not to cause a problem such as a rise.

  Specifically, after the operation state detecting means 33 detects the first speed increasing operation to the forward side of the speed change operation tool 31 when the planting clutch is engaged, the ascending operation switch until a predetermined time elapses. Ascending / descending control means 51 is configured so as to restrain the raising of the planting work machine 5 due to the operation of 38, and when the speed increasing operation of the machine body is performed by the speed change operation tool 31 immediately after starting the planting work running, It is possible to prevent the planting clutch 5 from being inadvertently disconnected due to an erroneous operation of the operation switch 38 and the planting work machine 5 to rise. That is, after confirming the stable state of the planting work that started the aircraft at a low speed, a predetermined time has elapsed when the speed of the aircraft is increased from a low speed to a high speed by operating the speed change operation tool 31. Otherwise, since the raising / lowering control means 51 does not accept the operation signal of the raising operation switch 38, even if the raising operation switch 38 is accidentally pressed at this shift operation timing, the planting clutch is disengaged and the planting work machine 5 is raised. There is no problem. On the other hand, at the end of planting work traveling, the shifting operation tool 31 is operated to decelerate the traveling speed of the aircraft, and the ascent operation switch 38 is pressed to disengage the planting clutch and raise the planting work machine 5. Can be allowed to.

  FIG. 11 is a flowchart showing another embodiment (embodiment 2) of forced lifting control of the planting work machine 5 executed by the control unit 51 described above. In this embodiment 2, first, planting is performed in step S1. If the work preparation switch 52 that enables the on / off operation of the planting clutch that transmits power to the attachment work machine 5 is in the off state, the process proceeds to step S9, and if the work preparation switch 52 is in the on state, the process proceeds to step S2.

  In step S2, it is determined whether or not an ascending operation switch (second operating tool raising switch) 38, which is a second operating tool provided in the grip portion 31a of the main transmission lever (transmission operating tool) 31, has been pressed. If the switch 38 is pressed, the process proceeds to step S3. If the ascending operation switch 38 is not pressed, the process proceeds to step S9.

  In step S3, the timer set with the time setting dial 58 is set (counted up), and the process proceeds to step S4. In step S4, the shift operation position from the forward side to the reverse side of the main shift lever 31 can be detected. After confirming whether or not the main transmission lever 31 has been operated at a higher speed in the forward operation range by the transmission lever potentiometer 33, specifically, after confirming the stable state of the planting operation in which the traveling speed of the aircraft is started at a low speed, When the main speed change lever 31 is operated to increase the traveling speed of the aircraft from a low speed to a high speed, the process proceeds to step S5.

  In step S5, it is determined whether or not the predetermined time of the timer set in step S3 (short time within 1 second) has elapsed. If the predetermined time of the timer has elapsed, the process proceeds to step S6, If time has not passed, it progresses to step S9.

  In step S6, the lifter cam potentiometer 57 determines whether or not the position of the lifter cam 55 is in the planting position, and the center float 23 provided at the planting position, that is, the lower part of the planting work machine 5, is located in the planting position. If it is not in the planting operation state where it contacts the farm scene, the process proceeds to step S7, and if the lifter cam 55 is in the planting position and the center float 23 is in the planting operation state where it contacts the farm scene, the process proceeds to step S8. move on.

  In step S7, the lifter cam potentiometer 57 determines whether the position of the lifter cam 55 is in the “up” or “down” position, that is, whether or not the planting work machine 5 is being automatically raised and lowered. If it is raising / lowering, it will progress to step S8, and if the planting work machine 5 is not in automatic raising / lowering, it will progress to step S9.

  In step S8, the planting work machine 5 is raised and the process proceeds to step S9. In this step S9, it is determined whether or not the predetermined time of the timer set in step S7 has elapsed, and the predetermined time of the timer has elapsed. If not, the process returns to the original state. On the other hand, if a predetermined time of the timer has elapsed, the process proceeds to step S10, and a series of controls such as resetting the set value (timer) of the time setting dial 58 described above is executed.

  The forced ascending / descending control of the planting work machine 5 according to the second embodiment described above is performed by the operation of the ascending operation switch 38 during the speed-up operation to the forward side of the machine body by the transmission operation tool (main transmission lever) 31. Since the raising / lowering control means 51 is configured to check the ascent of the machine 5, when the speed change operation tool 31 is used to increase the speed of the airframe to the forward side or during the speed increase operation, an error occurs. Even if the ascending operation switch 38 is pressed, the planting clutch is disconnected and the planting work machine 5 is not raised. On the other hand, when the travel of the riding type rice transplanter (transplanter) 1 is stopped by operating the speed change operation tool 31, the ascending operation is performed without releasing (holding) the grip 31a of the speed change operation tool 31. Since the planting work machine 5 can be quickly moved up by pressing the switch 38, the operability is excellent.

  The present invention is not limited to a transplanter such as a riding type rice transplanter in which a planting work machine is connected to a rear part of a machine body through a link mechanism so as to be movable up and down, and a work such as a rotary tiller device or the like through a link mechanism at the rear part of the machine body. The present invention can also be applied to agricultural tractors that perform tillage work by connecting the machines so that they can be raised and lowered.

3 Hydraulic cylinder 4 Link mechanism 5 Planting machine 23 Leveling float (center float)
24 Leveling float (side float)
Reference Signs List 31 Shifting operation tool 33 Operation state detection means 38 Lift operation switch 41 Single operation tool 43 Hydraulic control valve 51 Lift control means

Claims (3)

  A hydraulic cylinder (3) for raising and lowering a planting work machine (5) connected to the rear part of the machine body via a link mechanism (4), and a hydraulic control valve (43) for controlling expansion and contraction of the hydraulic cylinder (3) And a single operation tool (41) capable of moving up and down the planting work machine (5) and switching on and off the planting clutch, and a speed change operation tool for selecting the forward / backward travel of the machine and setting the travel speed. (31), a transplanter that lowers the planting work machine (5) to a state where the leveling floats (23, 24) provided in the lower part of the planting work machine (5) are in contact with the field scene, and performs the planting work The shifting operation tool (31) is provided with an ascending operation switch (38) capable of substantially simultaneously performing the disengaging operation of the planting clutch and the raising operation of the planting work machine (5), and the shifting operation tool. Operation state detection capable of detecting the operation state of (31) Means (33), and based on the detection of the speed change operation of the speed change operation tool (31) during the planting work of the operation state detection means (33), the planting work machine by operating the ascending operation switch (38) The transplanting machine characterized by comprising the raising / lowering control means (51) which checks the raise of (5).   After the operation state detecting means (33) detects the first speed increasing operation to the forward side of the speed change operation tool (31) when the planting clutch is engaged, the ascending operation switch (38) until a predetermined time elapses. The transplanting machine according to claim 1, wherein the raising / lowering control means (51) is configured so as to restrain the raising of the planting work machine (5) due to the operation.   When the speed increasing operation to the forward side of the machine body is performed by the speed change operation tool (31), the elevating control means (51) so as to check the ascent of the planting work machine (5) due to the operation of the ascending operation switch (38). The transplanter according to claim 1, which is configured as follows.

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