JP2006006268A - Lifting device for working section of agricultural machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: In the case of a seedling planter, a vehicle body may be retracted when a traveling clutch is disconnected, etc., without performing a reverse operation due to an inclination of a soil surface or a tiller surface after planting a seedling at the shore. Similarly, when the clutch is disengaged during traveling on an uphill or the like, the vehicle may move backward. In such a case, a part of the working part, in particular, the installation part may be pushed into the soil surface and may be damaged due to a large resistance.
SOLUTION: A reverse sensor detects the reverse rotation of a traveling wheel 2 to control the ascent of the ground work device 3 to provide a configuration of a working unit lifting device for a farm work machine. The working device 3 mounted on the rear side of the vehicle body performs ground work in a lowered posture. When the traveling wheel 2 of the vehicle body rotates backward, it is detected by a reverse sensor, and the work device 3 is raised to a non-working position with respect to the vehicle body by this detection. Then, the work device 3 is not raised only by the reverse operation, and rises only after the vehicle body is reversely moved.
[Selection] Figure 1

Description

  The present invention relates to a working unit lifting device that lifts and lowers a working unit of an agricultural working machine such as a seedling planting device of a seedling planting machine with respect to a vehicle body so that the working unit can be lifted regardless of the state in which the machine body moves backward. It is to make.

A technique (for example, refer to Patent Document 1) of raising a seedling planting device by detecting a lever position switching sensor when a forward / reverse switching lever is operated to a reverse position is known.
JP-A-8-154435 (first page, FIG. 6).

  In the case of a seedling planting machine, the body may move backward when the traveling clutch is disconnected, etc., even though the reverse operation is not performed due to the inclination of the soil surface, the surface of the tiller, etc. after planting the seedling at the shore. Similarly, when the clutch is disengaged during traveling on an uphill or the like, the vehicle may move backward. In such a case, a part of the working part, in particular, the grounding part may be pushed into the soil surface and may be damaged due to a large resistance.

  The invention according to claim 1 is configured as a working unit lifting device for an agricultural machine, wherein the reverse sensor 1 detects the reverse rotation of the traveling wheel 2 to raise the ground work device 3. The work device 3 mounted on the rear side of the vehicle body performs ground work in a lowered posture. When the traveling wheel 2 of the vehicle body rotates backward, it is detected by the reverse sensor 1, and the work device 3 is raised to the non-working position with respect to the vehicle body by this detection. Then, the work device 3 is not raised only by the reverse operation, and is raised only after the vehicle body is reversely moved.

  The invention according to claim 2 is characterized in that the reverse sensor 1 detects the operation of the transmission member of the traveling wheel 2 transmission path through the traveling clutch 4. When the traveling wheel 2 is rotated backward via the transmission mechanism via the traveling clutch 4 or when the traveling wheel 4 is rotated backward when the traveling clutch 4 is disengaged, the rotational operation of the transmission member of the transmission mechanism is detected by the reverse sensor 1. Then, the ground work device 3 is raised to the non-work position.

  According to the first aspect of the present invention, since the traveling wheel 2 is raised by the backward rotation regardless of the operation to the reverse position of the operating lever, the traveling wheel 2 can be lifted even when the traveling ground is rotated backward by a downward slope of the traveling ground. It is possible to prevent the machine body from being damaged by preventing the device unit from entering or colliding with the soil surface, the shore, or the like, thereby ensuring safety.

  In the invention according to claim 2, since the reverse sensor 1 detects the rotation of the transmission member of the transmission path of the traveling wheel 2, the configuration is simple and the traveling clutch and the like are cut off on an inclined ground or the like. In this state, the airframe may move backward naturally, but even in such a case, the working device 3 can be automatically raised and it is safe.

  Based on the drawings, a seedling planting device is mounted as the agricultural work device 3 on the rear side of the tractor body 8. This seedling planting device 3 includes a seedling planting frame 11 in which a center float 9 and the left and right side floats 10 are arranged, a rearwardly inclined seedling tank 12, a seedling planting nail 13 for separately planting seedlings at the rear lower end thereof, and the like Is arranged in a multi-row planting form. The rolling shaft 14 at the front part of the seedling planting frame 11 is attached to the lift link 15 at the rear end of the tractor vehicle body 8 in the four-wheel drive traveling mode. A front wheel 17 steered by a steering handle 16 is mounted on the axle 18 at the front of the vehicle body 8, and a rear wheel is mounted on the axle 19 as a traveling wheel 2 at the rear. On the step floor 20 of the vehicle body 8, a driver's seat 22 is mounted on an engine cover 21, and an engine 23, a fuel tank 24, and the like are provided below the engine cover 21. A transmission case 25 is provided at the front end portion of the vehicle body 8 to transmit the belt 26 from the engine 23 and transmit the front and rear wheels 17 and 2 and the PTO shaft 27 by the transmission mechanism. An auxiliary seedling receiving frame 29 is provided on both the left and right sides of the steering post 28. A lift link 15 in the form of a parallel link is connected to the rear frame 30 at the rear end of the vehicle body 8 so as to be rotatable up and down, and is moved up and down by expansion and contraction of a lift cylinder 31 with the vehicle body 8. The rolling shaft 14 of the seedling planting frame 11 is connected to the hitch link 32 at the rear end of the lift link 15 so as to be freely rollable. On the upper part of the rear frame 30, a fertilizer application device including a fertilizer hopper 33, a feeding device 34, and the like is provided, and fertilization guidance is performed to the seedling planting positions of the floats 9 and 10 via the fertilizer hose 35.

  The seedling planting frame 11 of the seedling planting device 3 is formed in the form of a wide seedling planting transmission case in the left-right direction, branches rearward to the left and right, and protrudes rearward along the upper part of each center float 9 and side float 10. The fork-like form forms a branching portion. A seedling planting case 36 is driven to rotate around a planting shaft 37 at the rear end of each branching portion, and the seedling planting claws 13 provided at both ends of the seedling planting case 36 are attached to the upper seedling tank 12. It is comprised in the rotary form so that it may descend | fall toward the soil surface of the lower part from the seedling opening 38, and it may perform a seedling planting effect | action. The seedling planting claws 13 are arranged in a six-row planting form at regular intervals in the lateral direction.

  The center float 9 and the side float 10 support the rear part so as to be rotatable around the float shaft 40 at the rear end of the float arm 39. The float arm 39 can be rotated up and down with respect to the seedling planting frame 11. The height of the shaft 40 can be adjusted. When the soil surface becomes shallow, the center float 9 is moved downward and the lift link 15 is moved downward in conjunction with switching the lift control valve of the lift cylinder 31 by vertical swinging around the float shaft 40 of the center float 9. Then, the seedling planting device 3 is lowered, and when the soil surface becomes deeper, the center float 9 is moved up and the seedling planting device 50 is moved up and down so that the seedling planting depth with respect to the soil surface is maintained constant. It is something to control. A cutout portion on which the seedling planting claw 13 acts can be formed at the rear portion of the center float 9 so that the seedling can be planted on a flat surface by the center float 9. Further, the left and right side floats 10 are formed in a T-shape in which the width of the front end portion is widened to project the flattened portion, and a seedling planting claw 13 is planted on the rear side of the flattened portion. The A lift sensor 43 that detects the lift and the lift position of the lift link 15 with respect to the rear frame 30 is provided at the base of the lift link 15. When the detection of the elevating sensor 43 is changed, a state of rising or lowering is displayed, and when this detection is stopped, rising or lowering is detected.

  A tank guide 41 that allows the seedling inlet 38 to be looked at at the dead point on the operation locus of each of the seedling planting claws 13 in the multi-row planting form is provided so as to extend the seedling planting frame 11 in the lateral direction. The lower edge is guided so as to be reciprocally movable in the horizontal direction. Each seedling tank 12 accommodates and feeds a rectangular mat seedling, and is configured to have a rearward and downward slope. A feeding belt 42 is provided at the bottom of the lower end, and the seedling is fixed by intermittent driving of the feeding belt 42. The amount is paid out.

  On the front side of the leveling position of the seedling planting part of the floats 9 and 10, there is a grooving device 45 projecting downward from the bottom surface of the floats 9 and 10, and the fertilizer is applied above the grooving device 45. The hose 35 can be removed and fertilized on the planted soil surface. The grooving device 45 is configured integrally with each of the floats 9 and 10 and swings up and down, and in a posture in which the seedling planting device 3 is raised to the non-working position, the front end side of the floats 9 and 10 hangs downward. Become.

  The transmission structure of the front wheel 17, the traveling wheel 2, the PTO shaft 27, and the like is such that the input shaft of the hydraulic continuously variable transmission HST at the front part is passed from the output shaft of the engine 23 through the belt 26 and the tension clutch pulley 46. It is transmitted to 47. The tension cut pulley 46 constitutes the traveling clutch 4. In this HST, the forward / reverse switching and the forward / reverse speed increasing / decreasing shift can be performed by operating the trunnion shaft, and the main shift can be performed.

  As a transmission mechanism in the transmission case 25 that is transmitted from the output shaft of the HST, a rear wheel transmission shaft 49 is interlocked via an auxiliary transmission, a rear wheel differential gear, a side clutch 48, and the like. From the left and right rear wheel transmission shafts 49, the rear wheels 2 can be transmitted by transmitting to the transmission gear in the rear axle housing 50. Further, the front transmission 17 can be transmitted from the auxiliary transmission through the front wheel operating gear and the transmission mechanism in the front axle housing 51. Further, a PTO shaft 27 is taken out from a part of the mission case 25 and transmitted to the feeding device 34 of the fertilizer application, the seedling planting device 2 and the like. A hydraulic pump 52 is provided at the tip of the input shaft 47 of the HST, and can send hydraulic pressure to the necessary parts. A rotation sensor that detects the number of rotations of the rear wheel 2 is provided in the rear axle housing 50, and the reverse sensor 2 that can detect the reverse rotation of the rear wheel 2 by detecting the rotation of the transmission gear or the like in the housing 50 and the rotation direction. . A main clutch brake pedal 53 is provided on the front side of the step floor 20 and is connected to the tension clutch pulley 46 and the brakes of the wheels 2 and 17 via the wires 54 and 55 so that the pedal 53 is depressed. Accordingly, the traveling clutch 46 is disengaged, and at the same time, the rotation of the wheels 2 and 17 is braked. A shift lever 56 is provided at the upper part of the steering post 28 so that the HST trunnion shaft is operated in an interlocked manner. It can be performed. This shift lever 56 is provided with a planting clutch button 57 that is turned on and off by pushing it with a thumb. By this operation, the seedling planting device 3 and the fertilizer feeding device 34 that are transmitted through the PTO shaft 27 are turned on and off. can do.

  On the side of the bonnet 60 covering the front side of the steering post 28, a key switch 61 to starter switch of the engine 23 that can be operated from the front outer side of the vehicle body 8, a choke knob 62, etc. are provided so that the driver can get off the vehicle body 8. Thus, even when the vehicle is traveling over a heel or when a work such as seedling loading is being performed, the operation of the engine 23 can be stopped by facilitating the operation from the front of the vehicle body 8. These key switches 61 are arranged on the right side of the bonnet 60 and the choke knob 62 is arranged on the left side, respectively, but may be arranged on any one side. A ramp 66 is provided at the upper end of the pole 65 as a center mascot at the center of the left and right width on the front side of the vehicle body 8. It is used as a mark in the aircraft traveling direction. In the raising / lowering control by the lift cylinder 31 of the seedling planting device 3, the reverse sensor 1 detects the backward rotation of the traveling wheel 2 to raise the ground work device 3 (backlift control). As shown in FIG. 6, the reverse sensor 1 and a shift position sensor 69 for detecting the reverse operation position of the shift lever 56 are provided on the input side of the controller 68, and the lift cylinder 31 is expanded and contracted on the output side. A lift control electromagnetic valve 70 for the hydraulic circuit is provided. The seedling planting device 3 attached to the rear side of the vehicle body 8 performs ground work in a lowered posture. When the seedling planting operation is started at the time of dredging or the like, the vehicle body 8 is often retracted. At this time, the speed change lever 56 is operated from the neutral position to the reverse position side of the HST, so Through the transmission mechanism and the like, the traveling wheel 2 and the front wheel 17 are driven to rotate backward. At this time, the operating position of the shift lever 56 is detected by the shift position sensor 69, and the reverse rotation of the traveling wheel 2 is detected by the reverse sensor 1. When the traveling wheel 2 of the vehicle body 8 rotates backward, it is detected by the reverse sensor 1, so that the lift control electromagnetic valve 70 is output, the lift cylinder 31 is extended, and the seedling planting device 3 does not move with respect to the vehicle body 8. Raised to work position. The work device 3 is not raised only by the reverse operation of the speed change lever 56, and is raised only when the reverse sensor 1 detects that the traveling wheel 2 is rotated in the reverse direction and the vehicle body 8 is reversely moved. Is done. For this reason, for example, regardless of the shift position of the shift lever 56, the reverse sensor 1 detects and raises the traveling wheel 2 even when the traveling wheel 2 moves backward due to the inclination of a tiller or the like. Regardless of the operation to the reverse position such as the shift lever 56 and the operation lever, the traveling wheel 2 is raised by the backward rotation, so that it can be lifted even when the traveling wheel is rotated backward by a downward inclination of the traveling ground. It is possible to prevent the aircraft from being damaged by rushing into and colliding with the soil surface of the part, the shore, etc., and the safety.

  The reverse sensor 1 detects the operation of the transmission member of the traveling wheel 2 transmission path via the traveling clutch 4. The traveling wheel 2 travels while being forwardly rotated or reversely rotated through a transmission mechanism via the traveling clutch 4. Further, when the traveling clutch 4 is rotated backward, the reverse operation of the transmission member of the transmission mechanism is detected by the reverse sensor 1, and the seedling planting device 3 is raised to the non-working position. The reverse sensor 1 detects the rotation of the transmission member of the transmission path of the traveling wheel 2 and thus has a simple configuration. When the traveling clutch 4 or the like is cut off on an inclined ground or the like, the aircraft naturally moves backward. Even in such a case, the seedling planting device 3 can be automatically raised, and it is safe.

  In this embodiment, the travel clutch 4 is constituted by a tension clutch pulley of the belt 26 between the engine 23 and the HST. The neutral position of the HST by the speed change lever 56 is set as the disengagement position of the travel clutch 4. be able to. When the HST speed change lever 56 is returned to the neutral position on an uphill or the like, the traveling wheel 2 may rotate backward without being driven by power, and the seedling planting device 2 is raised with respect to the vehicle body 8. The

  Next, mainly based on FIG. 7, when the speed change lever 56 is operated to the reverse position, the vehicle body 8 is not immediately moved backward, and the reverse movement is performed in a state where the float 9 of the seedling planting device 2 has a predetermined forward downward inclination. It is what is started. Here, in addition to the shift position sensor 69, a float angle sensor 71 is provided on the input side of the controller 68. In addition to the elevation control electromagnetic valve 70, a speed change motor 73 is provided on the output side. The float attack angle sensor 72 can detect the angle of the center float 9 in the forward-lowering state. This angle is set so that the seedling planting device 2 is not in the most elevated position, but is in a state where the front end is in contact with the soil surface. In particular, in the embodiment in which the floats 9 and 10 have the fertilizer groove 45 as described above, the lower edge of the groover 45 is located above the front ends of the floats 9 and 10 and the soil surface. It is set so as to incline to a state located on the upper side, so that the muddy soil is not clogged in the grooving device 45 by the backward movement. The speed change motor 73 operates the motor of the speed change lever 56 and operates the speed change lever 56 to the reverse position by the output from the controller 68. By moving backward when the float 9 is in the forward-lowering state, even if the front ends of the floats 9 and 10 are in sliding contact with the soil surface, the rear end is above the soil surface and thrust into the soil surface. The planting part can be prevented from being damaged and can be secured.

  When the raising of the seedling planting device 3 is started by operating the shift lever or the like to the reverse position as described above, the seedling planting device 3 is not sufficiently raised at the start of the reverse travel, so that the grooving device 45 is below the soil surface. It is easy to cause mud clogging by scraping the mud by the backward movement of the grooving device 45. Therefore, as shown in FIG. 8, in order to determine the rising position of the floats 9 and 10 having such a grooving device 45 at the forward downward inclination, the engine rotation is performed when the seedling planting device 3 is lifted by the lift control valve 70. Based on a fixed time value by a timer converted from the engine rotational speed by the sensor 74, the backward movement is delayed until the grooving device 45 is sufficiently separated from the soil surface, and output to the reverse position by the speed change motor 73 is performed. Here, since the rotation speed of the hydraulic pump in the hydraulic circuit of the lift control solenoid valve 70 is proportional to the rotation speed of the engine and the extension speed of the lift cylinder 31 also changes, a timer is set according to the rotation speed of the engine and is constant. Control the time.

  Further, mainly based on FIG. 9, when an elevating sensor 43 for detecting the elevating angle of the lift link 15 is provided on the input side of the controller 68 and a change in the detection of the elevating sensor 43 is detected, there is no change. Is to stop raising / lowering by outputting the raising / lowering control valve 70 to return to the neutral position, assuming that the seedling planting device 3 has been raised / lowered for some reason, and preventing damage to the mechanism. As a cause of stopping the raising / lowering, there is a case where the seedling planting device 3 interferes with other interferences, or a large soil resistance acts on the floats 9, 10 etc., so that the seedling planting device 3 is difficult to rise. In such a case, a resistance sensor for detecting the resistance force can be provided instead of or together with the lift sensor 43.

  Next, based on FIG. 10, the seedling planting operation state is displayed by the mascot lamp 66. When the seedling planting device 3 is lowered so that the floats 9 and 10 are in the ground sliding state and the shift lever 56 is detected by the shift position sensor 69 to be in the forward position, the planting transmission by the planting clutch button 57 is performed. When is turned off, the lamp 66 blinks to warn the driver or the like that the planting state has not been reached. In addition to the float angle sensor 72 and the shift position sensor 69, the planting clutch button 57 is provided on the input side of the controller 75, and the mascot lamp 66 is provided on the output side. When the seedling planting device 3 is in the seedling planting position, the floats 9 and 10 are in a grounded state, and the detection value by the float angle sensor 72 is greatly expressed.

  Next, mainly based on FIG. 11, the mascot pole 65 is set to a certain length, and the mascot pole 65 is horizontally moved to the front side, the lateral side, etc. with respect to the support portion 77 at the front end portion of the vehicle body 8. It is configured so that it can be rotated in a sloping manner. An operation lever 78 is connected to rotate the pole 65 so that the driver can operate from the handle 16 side. A marker 79 that hangs down is provided at the tip of the pole 65. When the mascot pole 65 is tilted to the front side A, the distance between the front buttock and the like can be measured. In addition, it is possible to know the distance between the lateral buttock and the already planted shoots by tilting to the side. The marker 79 may be configured to move along the mascot pole 65 and adjust the position.

The side view of a seedling planting machine. The plan view. The schematic front view. The top view of the vehicle body part. The side view of the main clutch part. The block diagram of the working device raising / lowering control part, and its flowchart. The block diagram of the working device raising / lowering control part which shows the example with another part, and its flowchart. The block diagram of the working device raising / lowering control part which shows the example with another part, and its flowchart. The block diagram of the working device raising / lowering control part which shows the example with another part, and its flowchart. The block diagram of the work state display control part which shows the example according to the part, and its flowchart. The side view which shows the effect | action of the mascot pole.

Explanation of symbols

1 Forward / reverse sensor 2 Traveling wheel (rear wheel)
3 Working device (seedling device)
4 Traveling clutch

Claims (2)

  A working unit lifting device for an agricultural working machine, wherein the reverse sensor 1 detects the reverse rotation of the traveling wheel 2 to raise the ground work device 3.   The working unit lifting / lowering device for an agricultural machine according to claim 1, wherein the reverse sensor (1) detects an operation of a transmission member of a traveling wheel (2) transmission path through a traveling clutch (4).

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