JP2006050958A - Control mechanism for lifting and lowering cylinder of implement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately change over a lifting and lowering valve and to prevent trouble such as hunting. <P>SOLUTION: A control mechanism 47 for a lifting and lowering cylinder of a ground implement is designed to detect the ground height of the implement with a press wheel 80, change over the lifting and lowering valve 31 connected to the press wheel 80 and control the lifting and lowering cylinder 24 so as to keep the machine body at the prescribed ground height. The control mechanism 47 is equipped with a control mechanism 48 for the lifting and lowering valve regulating the lifting and lowering valve 31 in the direction to return the lifting and lowering valve 31 to the neutral position when the lifting and lowering valve 31 is changed over. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an elevating cylinder control mechanism for a work implement, and more particularly to a control mechanism provided for accurately switching an elevating valve of an elevating cylinder.

  Conventionally, ground work machines that perform ground work such as vegetable transplanters and rice transplanters are equipped with a lift sensor that detects the ground height from the machine body to the ground surface, and according to the ground height detected by this lift sensor A lifting cylinder control mechanism that automatically controls the planting depth of the seedling by the seedling planting claw, such as a vegetable transplanting machine, is proposed by operating the lifting cylinder to raise and lower the machine. Yes.

  Specifically, the vegetable transplanter disclosed in Patent Document 1 includes a first sensor, a second sensor, and a third sensor, each of which includes a lift sensor (anther sensor roller), an operation lever, a rotary shaft of the lift sensor, and a lift valve. The elevating cylinder control mechanism (planting link mechanism) is connected via an arm, and this elevating cylinder control mechanism is configured such that the inner elevating sensor (） sensor roller) is attached to the body body according to the unevenness of the heel surface. The lift cylinder is automatically controlled by switching the lift valve via each arm in conjunction with the lift operation of the lift sensor (畝 sensor roller). In this way, the control of the elevating cylinder is configured by performing a link mechanism that interlocks with the elevating of the elevating sensor (） sensor roller), so that the manufacturing cost is lower than the conventional electronic control configuration. Can be reduced (see Patent Document 1).

Further, in the lifting cylinder control mechanism of Patent Document 1, the second arm that connects the lifting sensor and the lifting valve has a spring fitted on the outer periphery of a shaft body that can be extended and contracted, and unevenness on the surface of a bag or the like. When the lift sensor is abruptly raised, the impact is mitigated by the spring when the lift sensor is suddenly jumped up.
JP 2004-105156 A

  By the way, the raising / lowering cylinder control mechanism comprised in the ground work machine mentioned above is comprised so that the raising / lowering operation | movement of a raising / lowering sensor may be repeated continuously according to the unevenness | corrugation of surfaces, such as a straw and a farm field, ie, raising / lowering operation of an raising / lowering sensor Is transmitted to the elevating valve, and the elevating valve is continuously switched to automatically change the ground height of the airframe body continuously. And in order to raise and lower an airframe continuously, it is necessary to set it as the structure which switches a raising / lowering valve with high precision and controls a raising / lowering cylinder.

  However, if the lift valve and the lift sensor are simply connected by an arm or the like as in the conventional lift cylinder control mechanism, the control operation becomes unstable when the lift valve is switched, resulting in problems such as hunting. It was. That is, since the lift valve is mainly rotated by an arm or the like constituting the link mechanism, the switching operation is displaced in the vicinity of the dead zone of the lift sensor or the lift valve, causing hunting or the like.

  Further, the lifting cylinder control mechanism disclosed in Patent Document 1 can improve the switching accuracy of the lifting valve and protect the mechanism by arranging a spring so as to alleviate the lifting operation of the lifting sensor. However, it is not possible to effectively prevent hunting or the like that occurs when the elevating valve is switched, as described above, simply by arranging such a spring.

  Therefore, the present invention relates to a lifting cylinder control mechanism for a work machine, which solves the above-described conventional problem, and proposes a configuration that can switch a lifting valve with high accuracy and prevent problems such as hunting. It is the purpose.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, according to the first aspect of the present invention, the height of the work machine with respect to the ground is detected by the lift sensor, and the lift valve connected to the lift sensor is switched to control the lift cylinder so that the machine body has a predetermined ground height. The lift cylinder control mechanism of the machine includes a lift valve control mechanism that restricts the lift valve in a direction to return to the neutral position when the lift valve is switched.

  According to a second aspect of the present invention, in the first aspect, the elevating valve control mechanism is engaged with a weight member that is swingably disposed on the machine body side on a switching arm that is rotatably attached to the elevating valve. One end of the control arm is pivotally supported, and when the switching arm is rotated, the weight member is swung through the control arm, and the weight member's own weight is controlled in a direction to return the switching arm to the neutral position. It is added to the arm.

  As effects of the present invention, the following effects can be obtained.

  With the configuration shown in claim 1, the lifting valve can be switched with high accuracy, the switching operation is hardly shifted in the vicinity of the dead zone of the lifting sensor, the lifting valve, etc., and there is a problem such as hunting that occurs when the lifting valve is switched. Can be prevented.

  Since it is set as the structure shown in Claim 2, while being able to switch a raising / lowering valve stably and reliably by simple structure, since it is only necessary to provide a control arm and a weight member, it can comprise compactly.

Next, the best mode for carrying out the invention will be described below with reference to the drawings.
1 is a front view of the whole vegetable transplanting machine equipped with a lifting cylinder control mechanism according to the present invention, FIG. 2 is a rear view thereof, FIG. 3 is a left side view thereof, FIG. 4 is a right side view thereof, and FIG. 6 is a left side view of the engine output unit, FIG. 8 is a right side view of the lifting link mechanism, FIG. 9 is a right side view of the lifting sensor unit, and FIG. 10 is a diagram of the lifting valve control mechanism. FIG. 11 is a right side view of FIG. 10, FIG. 12 is a right side view of FIG. 10, FIG. 13 is a diagram showing a change in state of the lift valve control mechanism, and FIG. 14 is a lift valve control when hunting occurs. FIG. 15 is a rear perspective view of the cover ring, FIG. 16 is a right perspective view of the stand attachment portion, FIG. 17 is a left side view of the stand attached to the attachment portion, and FIG. FIG. 19 is a front oblique view of the front of the vehicle body frame with the stand attached to the attachment portion. 20 is an upper perspective view of the seedling stage, FIG. 21 is a front perspective view of the rolling sensor unit, FIG. 22 is a plan view thereof, FIG. 23 is a rear perspective view of the on / off lever unit, and FIG. FIG. 25 is a rear view, FIG. 26 is a left side view, FIG. 27 is a right side view, FIG. 28 is a plan view, and FIG. 29 is a bottom view.

  Hereinafter, a vegetable transplanter will be described as an example of a work machine provided with the lifting cylinder control mechanism 47 according to the present embodiment. However, the work machine is not limited to this, and for example, walking on a vegetable transplanter or the like It can be applied to various ground working machines such as molds or riding rice transplanters or fertilizer / seeding machines.

First, the overall configuration of the vegetable transplanter in this example will be outlined below.
As shown in FIG. 1 to FIG. 6, the vegetable transplanting machine in the present embodiment includes a front vehicle body frame 1 on which an engine 2 is mounted, 3 a rear vehicle body frame connected to the rear side of the front vehicle body frame 1, and 4 a rear vehicle frame. A traveling transmission case 5 provided on the lower side of the vehicle body frame 3 is a left and right traveling wheel that is supported on the traveling transmission case 4 via an axle case 6 so as to be able to swing up and down, and a steering frame 8 is disposed behind the rear vehicle body frame 3. A seedling mounting base 9 is installed between the left and right traveling wheels 5. A seedling planting claw is installed in the traveling transmission case 4 via a planting case 10. 11 is installed on the front body frame 1 and travels. Left and right front wheels configured to be able to swing up and down in conjunction with the swinging operation of the wheel 5, 12 is a soil-covering wheel that covers the seedling, 13 is a pot from the seedling tray on the seedling stand 7 that reciprocates left and right A seedling picking claw for taking out the white onion seedling, 80 is the left and right traveling wheels It is between a crush ring having a crush function is arranged to the fuselage forward of the seedling planting claw 9. Then, the green onion seedlings taken out by the seedling picking claws 13 are supplied to the seedling planting claws 9, and while the body is running by operating the steering handle 14 on the rear side of the handle frame 8, the pressure reducing wheel 80 is grounded on the heel It is configured to perform a transplanting operation to move the onion seedlings at a substantially constant interval. In addition, the vegetable transplanting machine in a present Example can plant not only leek seedlings but also seedlings such as lettuce and Chinese cabbage.

  In the figure, 16 is a bonnet, 17 and 18 are upper and lower standby seed beds provided substantially symmetrically on both sides of the bonnet 16, 20 is a traveling shift lever provided on the left side of the steering handle 14, and 21 is on the right side of the steering handle 14. A main clutch lever 22 is provided on the right side of the steering handle 14, and 24 is a lifting cylinder that swings the left and right axle case 6 to raise and lower the left and right traveling wheels 5 and the front wheel 11. The elevating cylinder 24 is provided on the lower surface of the front vehicle body frame 1, and the elevating cylinder 24 is operated by operating the elevating lever 22 to raise and lower the traveling wheel 5 and the front wheel 11. An operator walks behind the front wheel 11 and transplants the seedling by bringing the pressure-reducing wheel 80 into contact with the upper surface of the heel.

  A rolling cylinder 74 for horizontal control of the aircraft is disposed on the left side of the aircraft, and the rolling cylinder 74 is connected to a swing arm 82a fixed to a rolling fulcrum shaft 82 provided in the left-right direction of the body frame 1. As the swing arm 82a is swung, the rolling fulcrum shaft 82 rotates in conjunction with it. Connecting arms 82b are fixed to both ends of the rolling fulcrum shaft 82, and the connecting arms 82b are linked to the rotating shaft 83 of the axle case 6 via the traveling wheel connecting link mechanism 81 (see FIG. 7). Further, the pivot shaft 83 of the axle case 6 is interlocked with the front wheel 11 (tread 99) via the front wheel connecting link mechanism 84, and the front wheel 11 is interlocked with the swing of the traveling wheel 5 by the front wheel connecting link mechanism 84. It is configured to swing in the same direction (see FIG. 8). Then, by extending and retracting the piston rod of the rolling cylinder 74, the rolling fulcrum shaft 82 is rotated, and the left and right front wheels 11 and the traveling wheels 5 are moved up and down in the reverse direction to correct the horizontal tilt angle of the aircraft. Is configured to do.

  As shown in FIGS. 7 and 8, a lifting pump 26 is placed on the front upper surface of the rear vehicle body frame 3, and a seedling transmission case 27 is placed on the rear upper surface of the rear vehicle body frame 3. The rotational drive of the engine 2 is transmitted by the belt 28 to the traveling transmission case 4 on the lower surface of the rear vehicle body frame 3, and is transmitted from the traveling transmission case 4 to the seedling transmission case 27 by the belt 29, while the engine 2 transmits to the lifting pump 26. It is transmitted by the belt 30. In this way, the right and left traveling wheels 5, the seedling planting claws 9, and the seedling extraction claws 13 are driven to continuously plant the seedlings of the seedling mount 7 that reciprocates left and right.

  As shown in FIGS. 8 and 9, the lift pump 26 is provided with a lift valve 31, and the lift valve 31 is provided with a switching arm 32, and the switching arm is connected via a switching rod 33, 34, a joint link 35, and the like. The lift lever 22 is connected to the lever 32. The elevator valve 31 is switched by the elevator lever 22 and the elevator cylinder 24 is operated to raise and lower the traveling wheels 5 and the front wheels 11 to change the height of the machine, such as the body frames 1 and 3, to the machine and to run with respect to the machine. While the wheel 5 and the front wheel 11 are lowered to the headland turning or on-road traveling posture, the traveling wheel 5 and the front wheel 11 are raised relative to the machine to switch to the planting posture. The elevating valve 31 and the switching arm 32 constitute an elevating cylinder control mechanism 47 (elevating valve control mechanism 48) according to the present invention, and details will be described later (see FIGS. 10 to 12).

  A pipe shaft 36 is fixed to the lower surface side of the traveling transmission case 4, and a cover ring frame 38 is rotatably supported on a fulcrum plate 37 disposed on the pipe shaft 36 via a support shaft 39. 38, a cover ring 12 is provided at a position substantially below the seedling stage 7. The earthen ring frame 38 is connected to the planting depth switching lever 40 of the steering handle 14 on the rear side so that the planting depth adjustment range of the seedling A can be switched via the telescopic mechanism 41, and the earthing ring 12 is substantially constant. The earthen ring frame 38 is rotated around the support shaft 39 within the set range of the planting depth switching lever 40 so that the seedling planting claws 9 are opened and the seedlings are planted. 12 crushes and covers the seedling.

  A support plate 42 is rotatably supported on the support shaft 39, and a pressure reducing wheel 80 is swingably attached to the support plate 42. The pressure reducing wheel 80 is disposed at the front position of the seedling planting claw 9 and is disposed below the body and at the end of the support arm 44. The support arm 44 is attached to the support plate 42 so as to be able to swing up and down with the fulcrum shaft 43 as a swing center, and the other end is connected to the planting depth switching lever 40 via a wire 85. The pressure reducing wheel 80 is urged upward by an elastic member 86 interposed between the other end of the support arm 44 and the support plate 42, and is operated within the set range by operating the planting depth switching lever 40. It is positioned by being swung in the vertical direction to flatten the surface of the heel and to detect the height of the heel. In other words, in this embodiment, the elevating cylinder 31 is operated by controlling the elevating valve 31 so that the earth covering ring 12 is always in contact with the saddle.

Next, the lifting cylinder control mechanism 47 will be described in detail below.
As shown in FIGS. 9 to 12, the support plate 42 has a planting depth frame 87 extending toward the front of the machine body, and one end side of a planting depth arm 45 whose length is adjustable is connected to the planting depth frame 87. The other end side of the planting depth arm 45 is connected to the switching arm 32 of the lift valve 31. When the pressure wheel 80 moves up and down and the support plate 42 swings, the switching arm 32 is actuated via the planting depth frame 87. With this configuration, when seedlings are planted by the seedling planting claws 9, the presser wheel 80 moves up and down with respect to the machine according to the irregularities on the ridge, so that the support plate 42 and the planting frame 87 The switching arm 32 is switched via the planting depth arm 45, the lifting cylinder 24 is automatically controlled via the lifting valve 31, and the planting depth of the seedling planting claws 9 is reduced by raising and lowering the machine. Automatic control that keeps constant is performed.

  Thus, the vegetable transplanting machine in the present embodiment includes the lifting cylinder 24 and the lifting valve 31 for adjusting the planting depth of the seedlings, and the pressure reducing wheel 80 as the lifting sensor for detecting the seedling planting depth of the seedling planting claws 9. Is provided so that the detection operation of the pressure-reducing wheel 80 is directly transmitted to the lift valve 31, thereby reducing the transmission loss and making the depth of the seedling planted by the seedling planting claws 9 uniform. The pricing function can be improved by stabilizing the planting depth control.

Next, the lift valve control mechanism 48 will be described in detail below.
As shown in FIGS. 10 to 12, the lifting cylinder control mechanism 47 according to the present embodiment detects the height of the vegetable transplanter with respect to the ground by a pressure-reducing wheel 80 serving as a lifting sensor. The elevating valve 31 is switched through the planting depth arm 45, the switching arm 32, and the like so as to be interlocked, and the elevating cylinder 24 is controlled so as to have a predetermined seedling planting depth. The lift cylinder control mechanism 47 includes a lift valve control mechanism 48 that separately controls the switching operation of the lift valve 31 to improve the control accuracy of the lift cylinder 24.

  The lifting / lowering valve 31 is disposed on the side of the machine body of the lifting / lowering cylinder 24, one end is fixed to the switching arm 32, and the other end is connected to the lifting / lowering valve 31. 31 is arranged so as to be able to rotate relative to it. When the switching arm 32 is not operated by the lifting / lowering cylinder control mechanism 47, the planting depth switching lever 40, or the like, the lifting / lowering valve 31 is switched to fix the lifting / lowering cylinder 24 at the neutral position. On the other hand, when the lifting / lowering cylinder control mechanism 47 or the planting depth switching lever 40 is operated, the lifting / lowering valve 31 is switched in the direction to raise or lower the fuselage by rotating around the switching shaft 46. Elongate. In addition, a depth-of-planting arm 45 is rotatably attached to the pin shaft 32a and a switching rod 34 is rotatably attached to the pin shaft 32b.

  The lift valve control mechanism 48 is configured by engaging a control arm 49 having one end attached to the pin shaft 32b of the switching arm 32 and a weight member 51 swingably attached to the body body via the swing shaft 50. Has been. Specifically, one end of the control arm 49 is attached to the switching arm 32 as described above, and an engagement hole 49a having a long hole shape in plan view is opened at the other end, and the weight member 51 is inserted into the engagement hole 49a. Engagement protrusions 51 a formed to protrude from the surface are engaged with the weight member 51. In addition, the pin 52 penetrates and is stopped by the front-end | tip part of the engagement protrusion 51a so that the control arm 49 and the weight member 51 may not remove | deviate.

  The weight member 51 is pivotally supported by a swing shaft 50 having one end fixed to the main body side, and is substantially omitted in front view so that the length in the short side direction increases from the swing shaft 50 portion to the other end side. It is formed in a fan shape. Locking pieces 51 b and 51 b are formed on the side surface of the weight member 51 so as to protrude outward. The locking pieces 51 b and 51 b are formed so that the weight member 51 is mounted on the body around the swing shaft 50. On the other hand, when it is swung in the front-rear direction (left-right direction in FIG. 10), it acts as a stopper that engages with the side surface of the control arm 49. Further, the weight member 51 is swung in the front-rear direction in conjunction with the control arm 49 when the engagement protrusion 51 a is engaged with the engagement hole 49 a of the control arm 49. Note that the weight member 51 is preferably configured to have a sufficient weight as compared with the control arm 49, the switching arm 32, and the like for the reason described later.

Here, the control mechanism of the lift valve 31 in the present embodiment will be described below.
In a state in which the lift cylinder 24 is not operated, that is, in a state in which the planting depth switching lever 40 or the like is not operated, the lift valve 31 is positioned at the neutral position (see FIGS. 10 and 13A). When the work is performed, the planting depth switching lever 40 is operated, and the pressure-reducing wheel 80 is lowered so as to have a predetermined ground height with respect to the surface of the eaves. Then, the lifting and lowering operation of the pressure reducing wheel 80 is repeatedly performed in accordance with the shape of the saddle surface, and the lifting valve control mechanism 48 continuously switches the lifting valve 31 from the state shown in FIG. 10 to the state shown in FIG. 11 or FIG. (See FIG. 13).

  As shown in FIGS. 11 and 13 (b), when the pressure-reducing wheel 80 is in contact with the convex surface while being grounded to the heel surface, the pressure-reducing wheel 80 is rotated upward and connected to the pressure-reducing wheel 80. The planting depth arm 45 is pulled downward, and the switching arm 32 is rotated clockwise (rightward in FIG. 11, the same applies hereinafter) about the switching shaft 46 via the pin shaft 32a. When the switching arm 32 is rotated by the planting depth arm 45, the control arm 49 is pulled up via the pin shaft 32b, and the control arm 49 and the weight member 51 are engaged with each other (engagement hole 49a and engagement protrusion 51a). ), The weight member 51 is swung clockwise. Then, the lift valve 31 is switched in conjunction with the switching arm 32, and the lift cylinder 24 is controlled so that the airframe has a predetermined ground height, that is, the ground height is increased.

  On the other hand, as shown in FIGS. 12 and 13 (c), when the pressure reducing wheel 80 comes into contact with the concave surface, the pressure reducing wheel 80 is rotated downward, the planting depth arm 45 is pulled up, and the switching arm 32 is counterclockwise. It is turned around (in the left direction in FIG. 12, the same applies hereinafter). When the switching arm 32 is rotated by the planting depth arm 45, the control arm 49 is pulled up, and the weight member 1 is watched while the control arm 49 and the weight member 51 are engaged at the engaging portion in the same manner as described above. It is swung around. And the raising / lowering valve | bulb 31 is switched and the raising / lowering cylinder 24 is controlled so that the ground height of a body may become small.

  The lift valve control mechanism 48 in the present embodiment is configured to restrict the lift valve 31 to return to the neutral position when the lift valve 31 is switched. That is, in the state shown in FIG. 11, the control arm 49 pulled up with the rotation of the switching arm 32 moves the weight member 51 through the engagement protrusion 51 a of the weight member 51 engaged with the engagement hole 49 a. In other words, the rotation of the switching arm 32 is regulated in a direction to return the lift valve 31 to the neutral position. Also in the state shown in FIG. 12, similarly, the rotation of the switching arm 32 is restricted in the direction in which the elevating valve 31 is returned to the neutral position. That is, in the present embodiment, the switching arm 32 is configured to be engaged with the weight member 51 via the control arm 49, and the switching arm 32 can be rotated in any direction. The rotation direction is regulated.

  Then, regardless of whether the switching arm 32 is rotated in the front-rear direction in accordance with the vertical movement of the pressure reducing wheel 80, the engagement protrusion 51a slides along the shape of the engagement hole 49a to lower the control arm 49. The weight member 51 is configured so that its own weight is added in the direction, that is, the direction in which the switching sub-arm 32 is returned to the neutral position. The switching arm 32 is configured to be engaged with the weight member 51 via the control arm 49, and the rotation direction of the switching arm 32 is restricted regardless of the direction of rotation.

  As described above, when the lifting / lowering cylinder control mechanism 47 is provided with the lifting / lowering valve control mechanism 48 that restricts the lifting / lowering valve 31 in the direction to return to the neutral position when the lifting / lowering valve 31 is switched, the lifting / lowering valve 31 can be switched accurately. The switching operation is unlikely to occur in the vicinity of the dead zone of the lift sensor (pressing wheel 80), the lift valve 31, etc., and it is possible to prevent problems such as hunting that occur when the lift valve 31 is switched. The control operation can be performed stably.

  In particular, as shown in the present embodiment, the lift valve control mechanism 48 is pivotally supported at one end of the control arm 49 on the switching arm 32 rotatably attached to the lift valve 31, and the control is performed. When the other end of the arm 49 is engaged with the weight member 51 and the switching arm 32 is rotated, the weight member 51 is swung through the control arm 49 so that the switching arm 32 is returned to the neutral position. By configuring the weight member 51 so that the weight of the weight member 51 is added to the control arm 49, the lift valve 31 can be switched stably and reliably with a simple configuration, and the control arm 49 and the weight member 51 are only provided. Therefore, it can be configured compactly. Since the weight of the weight member 51 is added in the direction in which the control arm 49 is pulled down, the weight member 51 has a sufficient weight more than other components such as the control arm 49 and the switching arm 32. With this configuration, the control valve 31 can be switched with high accuracy.

  As shown in FIG. 14, when the switching arm 32 is pivoted vigorously, that is, when hunting occurs, the locking piece 51b of the weight member 51 comes into contact with the control arm 49 and the switching arm 32 is pivoted. The mechanism is such that the weight of the weight member 51 is added from this state and the switching arm 32 returns to the normal position. Therefore, even if hunting occurs, by restricting the rotation of the switching arm 31, the elevating valve 31 can be easily returned to the neutral position and hunting can be released.

Moreover, it outlines below about the other structure of the vegetable transplanter in a present Example.
As shown in FIGS. 1 to 4, 6, and 15, the soil covering ring 12 disposed in the vegetable transplanting machine according to the present embodiment has soil attached to the contact surface 12 a with the ground surface of the soil covering ring 12. A scraper 90 is disposed to scrape off. The earth covering ring 12 is rotatably arranged on the earth covering ring frame 38 via a pivot shaft 88, and a support plate 89 is fixed to the side surface of the earth covering ring frame 38 in a non-rotatable manner in the vicinity of the pivot shaft 88. The scraper 90 is pivotally supported on the support plate 89 by a pin shaft 91. The scraper 90 has a blade portion 90a extending from the pivotal support portion of the pin shaft 91 substantially parallel to the contact surface 12a of the cover ring 12, and the blade portion 90a contacts the contact surface 12a from above by its own weight. With this configuration, the soil covering ring 12 performs the planting operation while covering the dredging surface with the contact surface 12a while the soil attached to the contact surface 12a is scraped off by the blade portion 90a of the scraper 90. This eliminates the need for maintenance such as cleaning.

  A bolt 92 that adjusts the swing range of the scraper 90 is disposed at the upper end of the support plate 89 in the cover ring 12, and the bolt 92 is screwed to provide a gap between the end of the bolt 92 and the scraper 90. adjust. Conventionally, when the scraper 90 is fixed and attached to the cover ring 12, there is a case where the cover ring 12 cannot be rotated due to a small stone or the like sandwiched between the blade portion 90 a and the contact surface 12 a. there were. In the present embodiment, the scraper 90 is pivotally supported so that the blade portion 90a is brought into contact with the contact surface 12a by its own weight, and the swing range of the scraper 90 is regulated by the bolt 92. Thus, since the scraper 90 can swing so as not to hinder the rotation of the cover ring 12, for example, pebbles or the like are not caught between the blade portion 90a and the contact surface 12a of the scraper 90, and mud And the like, even if it is firmly attached in a convex shape from the contact surface 12a and cannot be scraped off immediately by the scraper 90, the rotation of the covering ring 12 is not hindered.

  As shown in FIGS. 3, 4, 16 to 18, a mounting portion 93 of the stand 75 is disposed on the side of the vehicle body frame 3 and behind the handle frame 8. A stand 75 for maintaining the machine body in the horizontal direction is attached to the attachment portion 93 via an attachment member 76 when the front wheel 11 and the wheel support 99 of the traveling wheel 5 are replaced. The attachment portion 93 is projected vertically downward from both ends of the frame portion 77 provided in the left-right direction of the machine body. Further, the upper end of the stand 75 abuts against the attachment portion 93 from below, and the attachment is formed in a U shape in plan view so as to cover the lower end portion of the attachment portion 93 and the upper end portion of the stand 75 from the side. The member 76 is attached, and the attachment portion 93 and the stand 75 are joined. By forming the attachment member 76 in a U shape in plan view, attachment from the side of the machine body is facilitated.

  An insertion hole 93a for positioning is provided in the horizontal direction in the upper and lower halfway portion of the mounting portion 93, and insertion holes 75a for positioning (two locations in this embodiment) are also provided in the stand 75 in the horizontal direction. Yes. By inserting the positioning pin 78 with the insertion holes 93a and 75a and the holes extending through the mounting member 76 in the horizontal direction at substantially the same intervals in the axial direction, the stand can be removed from the mounting portion 93 or rotated. It can position so that it may not do. Specifically, by first attaching the attachment member 76 to the stand 75 and attaching it to the attachment portion 93, such work can be simplified.

  Further, a rope hook 94 for hooking a rope or the like is disposed behind the attachment portion 93 and on the lower side portion of the handle frame 8 (see FIG. 16). For example, when the vegetable transplanter is placed on a truck bed or a container and moved, the rope hook 94 engages the rope with the rope hook 94 via the bed or a container so that the machine body can be moved. Can be tied and fixed. In particular, by disposing the rope hook 94 at such a position, the rope can be engaged with the rope hook 94 without being hindered by a frame portion (swing) formed on the outer edge of the loading platform. Note that the attachment portion 93 and the rope hook 94 are disposed on both sides of the airframe.

  As shown in FIGS. 6 and 19, a rolling valve 95 constituting a horizontal control mechanism is disposed at the front end of the body frame 1. By disposing the rolling valve 95 at such a position, the weight in the front-rear direction of the airframe can be balanced, and the airframe balance can be maintained, and maintenance can be facilitated. The horizontal control mechanism automatically keeps the planting part (seedling planting claws 9 and the like) even on sloping grounds and can be stably planted, and the horizontal control mechanism configured in the vegetable transplanting machine according to this embodiment. Can adopt a known mechanism.

  As shown in FIGS. 3, 4, and 20, a tray (not shown) in which seedlings are arranged is placed on the seedling stage 7, and this tray is arranged along the inclination of the seedling stage 7. It is transferred forward. The seedling stage 7 is configured so that a transport chain 96 for transporting the tray forward can be annularly driven in the vertical direction from both sides, and from the transport chain 96 to the inside direction of the seedling stage 7. The tray is engaged by the protruding portion 96a to be conveyed and conveyed. The seedling stage 7 is composed of a placement part 7a, a side part 7b, and the like. In the lower part of the seedling stage 7 where the upper part and the side part are covered by the placement part 7a and the side part 7b, A drive unit of a transport chain 96 (not shown) is placed. By this driving unit, the conveyance chain 96 is driven in an annular manner so as to convey the tray in the vertical direction with respect to the placement unit 7a and forward the tray.

  The seedling stage 7 has a left and right rod 97 extending in the front-rear direction of the side part 7 b and the seedling stage 7 at a position above the transport chain 96 in the gap between the placing part 7 a and the side part 7 b. A guide member 98 fixed to each other is disposed. The guide member 98 has a substantially rectangular shape, and is configured such that the lower side portion guides the drive path of the transport chain 96 (projection portion 96a). The guide member 98 is annularly driven while being guided from the lower side to the upper side of the seedling stage 7, so that the tray and the transfer chain 96 are easily engaged.

  Further, a plate body 104 having a substantially triangular shape in a side view is welded and fixed to the left and right rods 97 so as to protrude upward with respect to the surface of the seedling table 7 on the upper side of the seedling table 7. Yes. By arranging the plate body 104 in this way, it is possible to prevent the left and right ends of the tray placed on the seedling stage 7 from riding on the rod 97, and the tray is placed on the rod 97 and the guide member 98. It is possible to reliably guide to the gap portion.

  As shown in FIGS. 21 to 23, a pendulum type rolling sensor 63 is provided on the side surface of the lifting pump 26, and a shaft body 60 protrudes in the horizontal direction on the upper surface side of the lifting pump 26. A cylindrical shaft 61 is rotatably provided, and a pendulum type rolling sensor 63 is connected to the cylindrical shaft 61 via a sensor arm 62. One end of a rolling arm 64 is fixed to the cylindrical shaft 61, and the rolling arm 64 is operated by swinging the rolling sensor 63 left and right. The rolling arm 64 is connected to the rolling valve 95. When the pendulum type rolling sensor 63 swings left and right as the aircraft tilts left and right, the rolling arm 64 is rotated and the rolling valve 95 connected to the rolling arm 64 is moved. By switching, the rolling cylinder 74 (see FIGS. 3 and 7) is operated, the difference in height between the left and right traveling wheels 5 and the front wheels 11 is changed, and the left and right inclination of the machine is automatically controlled.

  The rolling sensor 63 is configured to be turned on and off by an on / off lever 65 disposed in the vicinity of the steering handle 14 at the rear of the machine body. The on / off lever 65 is continuously provided via a wire cable 69 so that the pin 67 can be swung. The pin 67 is provided so as to project from the pin shaft 66, and the end of the wire cable 69 is fixed to the end of the swing arm 70 fixed to the pin shaft 66 so as not to rotate relative to the pin shaft 66. It is pivotally supported by. The rolling arm 64 is provided with a notch 68 having a triangular shape in front view, and the pin 67 is provided in the notch 68 so as to be able to be inserted and released. The on / off lever 65 is disposed in an operation groove 71 cut out in a substantially inverted U shape when viewed from the front, and is engaged with either the off stopper 71a or the on stopper 71b at the end of the operation groove 71. It is urged downward by an elastic member (not shown).

  When the on / off lever 65 is engaged with the off stopper 71a, the pin 67 is positioned at the top on the right side of the notch 68 and abuts against the inner surface of the notch 68 so that it cannot move up and down, and the rolling sensor 63 swings. The rolling valve 95 cannot be switched. On the other hand, when the on / off lever 65 is operated to engage with the on stopper 71b, the swing arm 70 is swung via the wire cable 69 in conjunction with the operation of the on / off lever 65, and the pin 67 is notched 68. The pin 67 can be moved up and down in the space of the notch 68 and the rolling valve 95 can be switched by swinging by the rolling sensor 63.

  In this way, by arranging the on / off lever 65 in the vicinity of the steering handle 14 and switching the on / off lever 65 so that the horizontal automatic control using the rolling sensor 63 can be turned on / off, the operator can This switching operation can be easily performed even while the steering wheel is being operated. An inter-stock adjustment lever 72 and an inter-stock display indicator 73 are disposed in the vicinity of the steering handle 14 and on the side of the on / off lever 65 (see FIG. 2). Similarly, the operator is operating the handle of the aircraft. Even so, the adjusting operation is easy.

  In the four-wheel structured vegetable transplanting machine configured as described above, the traveling wheel 5 is provided with a wheel support 100 that supports the traveling wheel 5, and the rotation shaft 83 is expanded and contracted in the width direction to be positioned in the width direction. The front wheel 11 can be adjusted in position in the width direction by adjusting the wheel support 99 that supports the front wheel 11, and can be reduced in the width direction and placed on the platform of a small truck.

  As shown in FIGS. 24 to 29, the vegetable transplanter according to the present embodiment is configured so that the wheel support 100 and the wheel support 99 can be exchanged, and the tread width can be widely changed by exchanging them. it can. Specifically, on the front wheel 11 side and the traveling wheel 5 side, the tread width is widened by replacing and attaching the wheel supports 101 and 102 having a wider tread width than the vegetable transplanter (see FIGS. 1 to 6). be able to. In the present embodiment, the longitudinal length of the wheel support 101, 102 on the right side of the body (left side in FIG. 24) is configured to be longer than the longitudinal direction length on the left side of the body. The wheel support body 101 is configured to be able to change the mounting position of the front wheel 11, and the wheel support body 102 is rotatably supported on the rotating shaft 83, the end portion is fixed to the body, and further the vehicle body It is attached to the airframe by being connected to both ends of the pipe shaft 36 fixed below the frame 3. Further, on the right side of the machine body, the wheel support body 101 and the wheel support body 102 are connected in the front-rear direction by a reinforcing tool 103 to increase the strength.

The front view of the whole vegetable transplanting machine provided with the raising / lowering cylinder control mechanism based on this invention. The rear view. The left side view. The right side view. FIG. The bottom view. The left view of an engine output part. The right view of a raising / lowering link mechanism. The right view of a raising / lowering sensor part. The right view of a raising / lowering valve control mechanism. Similarly, the right side view of FIG. Similarly, the right side view of FIG. The figure showing the state change of a raising / lowering valve control mechanism. The figure showing the state change of the raising / lowering valve control mechanism at the time of hunting generation | occurrence | production. The rear perspective view of a soil covering ring. The right perspective view of a stand attaching part. The left view of the state which attached the stand to the attaching part. The front view of the state which attached the stand to the attachment part similarly. The front perspective view of a vehicle body frame front. The upper perspective view of a seedling stand. The front perspective view of a rolling sensor part. FIG. The rear perspective view of an on-off lever part. The front view of the whole vegetable transplanter of FIG. 1 which expanded the tread width. The rear view. The left side view. The right side view. FIG. The bottom view.

Explanation of symbols

24 Lifting cylinder 31 Lifting valve 32 Switching arm 45 Planting depth arm 49 Control arm 51 Weight member 47 Lifting cylinder control mechanism 48 Lifting valve control mechanism 80 Pressure reducing wheel

Claims (2)

In the lifting cylinder control mechanism of the working machine that detects the height of the working machine with respect to the ground by the lifting sensor and switches the lifting valve connected to the lifting sensor to control the lifting cylinder so that the machine body has a predetermined ground height.
An elevating valve control mechanism that regulates the elevating valve in a direction to return to the neutral position when the elevating valve is switched;
A lifting cylinder control mechanism for a working machine. The elevating valve control mechanism is
One end of a control arm that engages with a weight member that is swingably disposed on the machine body is pivotally supported on a switching arm that is pivotally attached to the lift valve.
When the switching arm is rotated, the weight member is swung through the control arm, and the weight member's own weight is added to the control arm in a direction to return the switching arm to the neutral position.
The lifting / lowering cylinder control mechanism of the working machine according to claim 1.

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