JP2016067265A - Work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work vehicle in which a work device can be attached and detached easily.SOLUTION: A seedling transplanter 1 as a work vehicle comprises lifting link mechanisms 32 provided in a vehicle body 2 and attachment/detachment mechanisms 6 provided in the lifting link mechanisms 32 for attaching and detaching a seedling planting apparatus 3. The attachment/detachment mechanism 6 comprises: a receiving hitch 61 to which the seedling planting apparatus 3 is mounted; a mounting hitch 62 provided in the seedling planting apparatus 3 and connected to the receiving hitch 61; a rolling shaft 63 attached to the mounting hitch 62 for rotating the seedling planting apparatus 3 laterally; a rolling rock member 64 which is provided in the mounting hitch 62 and capable of restricting the lateral rotation of the seedling planting apparatus 3; and a mounting lock member 65 provided in the receiving hitch 61 for locking the mounting hitch 62. The rolling lock member 64 restricts the lateral rotation of the seedling planting apparatus 3 before connection. The mounting lock member 65 allows the rolling lock member 64 to rotate the seedling planting apparatus 3 laterally when the mounting hitch 62 is locked.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a work vehicle such as a seedling transplanter that performs operations such as planting seedlings in a field.

  A seedling transplanter as a work vehicle has a traveling vehicle body that travels in a farm field, a seedling transplanting device as a working device attached to the rear part of the traveling vehicle body, and the like. This type of seedling transplanter is disclosed, for example, in Patent Document 1 below.

  The seedling transplanting machine shown in Patent Document 1 is provided with a receiving hitch at the rear part of the lifting link mechanism that lifts and lowers the seedling planting device, and is attached to the hitch by receiving a mounting hitch of a working device such as a seedling planting device. It is the structure which attaches an apparatus to a raising / lowering link mechanism. The receiving hitch is provided with a rolling shaft for rotating the work device in the left-right direction around an axis parallel to the front-rear direction of the machine body.

  In addition, the working device is provided with a horizontal sensor that detects the posture in the left-right direction around the axis parallel to the front-rear direction, and the body has a rolling control motor that rotates the working device around the axis described above. Is provided. When the work device rolls left and right around the axis parallel to the front-rear direction due to the inclination of the field etc., the seedling transplanter rotates the work device in the reverse direction by the control motor until it becomes horizontal with respect to the field scene Then, when the working device is in a horizontal state, the rotation by the control motor is stopped.

  This allows the seedling transplanter to maintain the working accuracy of the working device evenly in the left-right direction of the machine, because the working device is in a horizontal state with respect to the field even if the farm scene is uneven or the field is inclined. Can keep.

JP 2010-246430 A

  However, in the seedling transplanter disclosed in Patent Document 1 and the like, the posture of the working device at the time of attaching / detaching operation becomes unstable because the working device can be rolled in the left-right direction at the time of attaching / detaching the working device. For this reason, in the seedling transplanter shown in Patent Document 1 and the like, there is a problem that the work device is difficult to attach and detach, and the work efficiency is lowered.

  Moreover, in the seedling transplanter shown in Patent Document 1 or the like, the work efficiency is reduced because the worker needs to move to the rear side of the traveling vehicle body in order to perform the locking operation when the lifting link mechanism and the working device are connected. In addition, there is a problem that causes the worker to spend extra labor. Furthermore, if an operator other than the operator who performs the steering operation performs the locking operation, it is not necessary to move the operator who operates the traveling vehicle body, but there is a problem that manpower is increased accordingly.

  Accordingly, an object of the present invention is to provide a work vehicle that can improve the disadvantages of the conventional example and can easily attach and detach the work device.

  In order to achieve the above-mentioned object, the invention according to claim 1 is provided with an elevating link mechanism (32) provided at a rear portion of the traveling vehicle body (2), an elevating link mechanism (32), and a working device ( 3) a mounting hitch (61) for mounting, a mounting hitch (62) provided in the working device (3) and connected to the receiving hitch (61), attached to the mounting hitch (62), and In a work vehicle (1) provided with a rolling shaft (63) for turning the work device (3) left and right, the work vehicle (1) is provided on the mounting hitch (62) and restricts the left and right turn of the work device (3). A possible rolling lock member (64) and a mounting lock provided on the receiving hitch (61) and locking the mounting hitch (62) when the mounting hitch (62) is connected to the receiving hitch (61) The rolling lock member (64) is rotated left and right of the working device (3) when the mounting hitch (62) is not connected to the receiving hitch (61). When the mounting hitch (62) is connected to the receiving hitch (61) to lock the mounting hitch (62), the mounting lock member (65) is connected to the rolling lock member (64). A work vehicle (1) characterized in that the left-right rotation of the device (3) is allowed.

  According to a second aspect of the present invention, there is provided a rolling cylinder (71) provided between the traveling vehicle body (2) and the work device (3), the work device (3), and the The mounting hole (72a) through which the screw shaft (75) provided at the tip of the cylinder rod (71b) of the rolling cylinder (71) passes, and the mounting hole as the distance from the cylinder body (71a) of the rolling cylinder (71) increases. The working device side mounting member (72) having a tapered surface (72b) having a large diameter (72a) and the cylinder main body (71a) of the rolling cylinder (71) screwed to the screw shaft (75). The work vehicle (1) according to claim 1, further comprising: a fixed handle (73) having a tapered surface (73c) having a smaller diameter as approaching.

  According to a third aspect of the present invention, there is provided a rolling cylinder (71) provided between the traveling vehicle body (2) and the work device (3), and a cylinder rod (71b) of the rolling cylinder (71). A rod end (74) provided at the tip of the rod end and provided with a screw hole (74a), and a screw hole provided in the working device (3) through the screw hole (74a) of the rod end (74). The work vehicle (1) according to claim 1, further comprising: a screw member with a grip (76) screwed into (72c).

  According to a fourth aspect of the present invention, there is provided a driven rotator (90) rotatably provided integrally with the mounting lock member (65), and a drive rotator (91a) for rotating the driven rotator (90). And an attachment / detachment switching actuator (91), and an operating member (92) for operating the attachment / detachment switching actuator (91) is provided on the traveling vehicle body (2). It is a work vehicle (1) in any one of.

  According to a fifth aspect of the present invention, the attachment / detachment switching actuator (91) is moved in the direction in which the attachment lock member (65) releases the lock of the attachment hitch (62) by the operation of the operation member (92). A control means (8) for driving, and when the control means (8) unlocks the mounting hitch (62) of the mounting lock member (65), the rolling lock member (64) has the working device ( 3) restricting the left-right rotation, and lowering the working device (3) by the elevating link mechanism (32), and after a predetermined time elapses after the working device (3) is lowered, the traveling vehicle body (2 The work vehicle (1) according to claim 4, wherein the work vehicle (1) is moved forward.

  According to a sixth aspect of the present invention, there is provided proximity detection means (66) for detecting an approach between the receiving hitch (61) and the mounting hitch (62), and a cockpit (22) of the traveling vehicle body (2). And a notifying means (19) for notifying that the proximity detecting means (66) has detected an approach between the receiving hitch (61) and the mounting hitch (62). A work vehicle (1) according to any one of claims 1 to 5, characterized in that.

  According to the first aspect of the present invention, when the mounting hitch (62) is not connected to the receiving hitch (61), the rolling lock member (64) regulates the left-right rotation of the work device (3). . For this reason, since the work vehicle (1) is restricted from turning in the left-right direction until the work device (3) is attached to the elevating link mechanism (32), the work vehicle (1) is operated before the work device (3) is attached. Since it is possible to prevent the device (3) from rotating left and right, the time and labor required for attaching / detaching the work device (3) can be reduced. Therefore, the work vehicle (1) can easily perform the work of attaching and detaching the work device (3).

  In the work vehicle (1), when the mounting lock member (65) connects the mounting hitch (62) to the receiving hitch (61) and locks the mounting hitch (62), the mounting lock member (65) becomes the rolling lock member. (64) allows the work device (3) to turn left and right. For this reason, when the mounting hitch (62) is connected to the receiving hitch (61) and the mounting hitch (62) is mounted, the work device (3) can be rotated in the left-right direction. Therefore, when the work vehicle (1) is mounted on the lifting / lowering link mechanism (32), the work device (3) can be rotated in the left-right direction, so that the work device (3) can be attached and detached. The time and labor required can be reduced.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, the work device side mounting through which the screw shaft (75) attached to the cylinder rod (71b) of the rolling cylinder (71) is passed. A taper surface (72b) is formed in the mounting hole (72a) of the member (72), and a taper surface (73c) is also formed in the fixing handle (73). For this reason, when attaching the rolling cylinder (71) to the working device (3), the tapered surfaces (72b, 73c) overlap each other. Therefore, when the fixing handle (73) is fastened to the screw shaft (75), the other It is possible to make it difficult to loosen without using a tool, and it is possible to easily attach / detach the work device (3) without using a tool, and the work efficiency of the attaching / detaching work is improved.

  According to the invention described in claim 3, in addition to the effect of the invention described in claim 1, the screw member with grip (74) is attached to the rod end (74) attached to the cylinder rod (71b) of the rolling cylinder (71). 76) is provided with a screw hole (74a). For this purpose, the cylinder rod of the rolling cylinder (71) is engaged by screwing the screw member with grip (76) into the screw hole (74a) of the rod end (74) and the screw hole (72c) of the working device (3). (71b) is configured to be detachable from the work device (3). Therefore, if the operator manually turns the gripped screw member (76) and attaches the cylinder rod (71b) of the rolling cylinder (71), the rolling cylinder (71) can be prevented from coming off during the operation. It is prevented from failing. Further, the work device (3) can be easily attached / detached without a tool, and the work efficiency of the attach / detach work is improved.

  According to the invention described in claim 4, in addition to the effect of the invention described in any one of claims 1 to 3, the attachment / detachment switching actuator (91) is driven by operating the operation member (92). Thus, the mounting lock member (65) can be rotated integrally with the driven rotating body (90). For this purpose, the mounting hitch (65) of the mounting lock member (65) can be operated by manually operating the mounting lock member (65) without operating the mounting lock member (65) by operating the operating member (92) when the work device (3) is attached or detached. 62) can be locked and unlocked. Therefore, the work vehicle (1) reduces the labor of the worker when the work device (3) is attached / detached, reduces the time required for the work device (3) to be attached / detached, and improves the work efficiency.

  According to the fifth aspect of the invention, in addition to the effect of the fourth aspect of the invention, when the attachment / detachment switching actuator (91) is driven to unlock the mounting lock member (65), the rolling lock member (64) restricts the left-right rotation of the work device (3). For this reason, when removing work apparatus (3), it can control that work apparatus (3) rotates right and left.

  Further, when the lock of the mounting lock member (65) is released, the work device (3) is lowered and the traveling vehicle body (2) is advanced after a predetermined time has elapsed, so that the operation member (92) can be operated, and the lift link mechanism The work device (3) can be removed from (32). Therefore, since the work vehicle (1) does not require any operation other than the operation member (92) when removing the work device (3), the work efficiency is improved and the manpower required for the work device (3) to be attached and detached. Is reduced.

  According to the invention described in claim 6, in addition to the effect of the invention described in any one of claims 1 to 5, the vehicle travels to a position where it can be connected to the lifting link mechanism (32) and the work device (3). When the vehicle body (2) is moved, the notification means (19) notifies that the receiving hitch (61) and the mounting hitch (62) have approached, so that the manpower required for the work device (3) to be attached and detached is reduced. Reduced.

It is a side view showing the seedling transplanting machine concerning an embodiment. It is a top view showing the seedling transplanting machine concerning an embodiment. It is a side view which isolate | separates and shows the receiving hitch and mounting | wearing hitch of the seedling transplanting machine which concern on embodiment. FIG. 4 is a side view showing a state where the receiving hitch and the mounting hitch shown in FIG. 3 are connected. It is a top view of the rolling mechanism of the seedling transplanter which concerns on embodiment. It is sectional drawing of the principal part of the rolling mechanism shown by FIG. It is a front view of the adhering handle of the rolling mechanism shown in FIG. It is sectional drawing which follows the VIII-VIII line in FIG. It is a side view showing the state where the mounting lock member of the seedling transplanter concerning an embodiment was rotated against the energizing force of a torsion coil spring. It is a side view which shows the state in which the mounting | wearing lock member of the seedling transplanter which concerns on embodiment contacts a rolling lock member. It is sectional drawing which shows the state which the lock pin of the seedling transplanter which concerns on embodiment pulled out from the inside of a lock groove. It is a top view of the rolling mechanism of the seedling transplanter which concerns on the modification 1 of embodiment. It is a side view which shows the state which connected the receiving hitch and mounting | wearing hitch of the seedling transplanter which concerns on the modification 2 of embodiment. It is a block diagram which shows the schematic structure of the seedling transplanter which concerns on the modification 3 of embodiment. It is a top view which shows the float of the direct seeding machine which concerns on the modification 4 of embodiment, a grooving machine, etc. FIG. It is sectional drawing which follows the XVI-XVI line | wire in FIG. It is sectional drawing which follows the XVII-XVII line in FIG.

  Below, the seedling transplanter as a work vehicle concerning an embodiment of the present invention is explained in detail based on a drawing. Note that the present invention is not limited to these embodiments. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same. Furthermore, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.

[Embodiment]
A seedling transplanter 1 as a work vehicle according to an embodiment of the present invention will be described with reference to FIGS. Drawing 1 is a side view showing the seedling transplanter concerning an embodiment. FIG. 2 is a top view illustrating the seedling transplanter according to the embodiment. FIG. 3 is a side view showing the receiving hitch and the mounting hitch of the seedling transplanter according to the embodiment separately. FIG. 4 is a side view showing a state where the receiving hitch and the mounting hitch shown in FIG. 3 are connected. FIG. 5 is a top view of the rolling mechanism of the seedling transplanter according to the embodiment. FIG. 6 is a cross-sectional view of a main part of the rolling mechanism shown in FIG. FIG. 7 is a front view of the fixing handle of the rolling mechanism shown in FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG.

  The seedling transplanter 1 according to the embodiment is for planting seedlings in a farm field while traveling. In the following, the forward direction of the seedling transplanter 1 is the front side (left side in FIGS. 1 and 2), the backward direction of the seedling transplanter 1 is the rear side (right side in FIGS. 1 and 2), and the seedling transplanter An orthogonal direction orthogonal to the front-rear direction of 1 is the left-right direction, the right side of the forward direction is the right side (upper side of FIG. 2), the left side of the forward direction is the left side (lower side of FIG. 2), The vertical direction perpendicular to the vertical direction is the vertical direction.

  As shown in FIGS. 1 and 2, the seedling transplanter 1 includes a traveling vehicle body 2 that travels in a field, and a seedling planting device 3 (corresponding to a working device) that is attached to the rear part (rear side) of the traveling vehicle body 2. , A power transmission mechanism 4, a leveling device 5, an attachment / detachment mechanism 6 (shown in FIGS. 3 and 4), a rolling mechanism 7 (shown in FIG. 5), and a control means 8 (shown in FIG. 1). .

  The traveling vehicle body 2 has four wheels 12 including a pair of left and right front wheels 12a and 12a for traveling and a pair of left and right rear wheels (traveling wheels) 12b and 12b. The four wheels 12 serve as driving wheels. It is a wheel drive vehicle. The traveling vehicle body 2 includes a main frame 10 and an engine 11 mounted on the main frame 10. In the seedling transplanting machine 1, the driving force of the engine 11 is used not only for moving the traveling vehicle body 2 forward or backward, but also for driving the seedling transplanting device 3.

  The engine 11 is a heat engine such as a diesel engine or a gasoline engine, and outputs driving force from an output shaft. The output shaft protrudes from the left side of the traveling vehicle body 2. The engine 11 is disposed at a substantially center in the left-right direction of the traveling vehicle body 2 and in a state of protruding upward from the floor step 20 on which an operator places his / her foot when getting on. At this time, the output shaft of the engine 11 is located below the floor surface of the floor step 20.

  Here, the floor step 20 is provided between the front part (front side) of the traveling vehicle body 2 and the rear part (rear side) of the engine 11, and is mounted on the main frame 10. Part of the floor step 20 has a lattice shape so that mud attached to the shoes can be dropped onto the field. A rear step 21 that also serves as a fender for the rear wheels 12b and 12b is provided behind the floor step 20. The rear step 21 has an inclined surface that is inclined upward as it goes rearward, and is disposed on each of the left and right sides of the engine 11.

  The engine 11 protrudes upward from the floor step 20 and the rear step 21, and an engine cover 14 that covers the engine 11 is disposed in a portion protruding from these steps. That is, the engine cover 14 covers the engine 11 while projecting upward from the floor step 20 and the rear step 21.

  The traveling vehicle body 2 is provided with a cockpit 22 above the engine cover 14, and a front cover 23 is disposed in front of the pilot seat 22 and in front of the traveling vehicle body 2. . The front cover 23 is disposed in a state of protruding upward from the floor surface of the floor step 20, and divides the front side of the floor step 20 left and right.

  Inside the front cover 23 are disposed a control means 8, an operation device such as an operation panel, a steering mechanism, a fuel tank for engine fuel, and the like. Further, on the upper portion of the front cover 23, various operation levers, instruments, and a handle 24 are disposed. The handle 24 is provided as a steering member for steering and steering the front wheels 12a and 12a when an operator rotates the steering wheel 24, and the front wheels 12a and 12a are steered (rotated) via a steering mechanism or the like in the front cover 23. Rudder).

  Further, as various operation levers provided on the upper portion of the front cover 23, a travel operation lever (not shown) for switching the traveling vehicle body 2 forward / backward, stop and moving speed is provided. In addition, as various operation levers provided on the upper portion of the front cover 23, a “road traveling mode” in which the traveling vehicle body 2 travels on the road, a “work traveling mode” in which seedlings are planted in the field while the traveling vehicle body 2 travels, and the like. An auxiliary speed change lever (not shown) for switching between the two is provided. In addition, as various operation levers provided on the upper portion of the front cover 23, a stock change dial (a seedling planting interval in the traveling direction of the traveling vehicle body 2) that changes the seedling interval (seed planting interval in the traveling direction of the traveling vehicle body 2) planted by the seedling planting device 3 in the field. (Not shown) is provided. In the embodiment, the inter- stock change dial is a state in which the number of stocks per seedling (planting interval) is 37 stocks, a state of 42 stocks, a state of 47 stocks, and a state of 50 stocks. , 60 stocks, 70 stocks, 80 stocks, and 90 stocks.

  Furthermore, a leveling height adjustment lever (not shown) for adjusting the height of the leveling device 5 is disposed as various operation levers provided on the upper portion of the front cover 23. In the front cover 23, a detection sensor (not shown) for detecting the operation position of the leveling height adjusting lever is disposed. Further, a partial changeover switch for turning on / off the operation of some planting mechanisms 36 of the seedling planting device 3 is provided at an upper portion of the front cover 23 or the like. The partial changeover switch has a one-to-one correspondence with the planting mechanism 36. The partial changeover switch changes the on / off state of the planting partial clutch of the planting mechanism 36 corresponding to the control means 8. Furthermore, a seedling removal amount change switch for changing the seedling removal amount of the planting basket 36c of the seedling planting device 3 is provided on the upper portion of the front cover 23 or the like. The seedling removal amount change switch causes the control means 8 to change the seedling removal amount of the planting basket 36c of the seedling planting device 3. Further, a proximity detection switch 66 (shown in FIG. 3 and the like) described later detects the approach between the receiving hitch 61 and the mounting hitch 62 at a position where the operator can visually recognize the front cover 23 from the cockpit 22 of the traveling vehicle body 2. An informing means 19 (not shown in FIG. 2) for informing the user of the above is provided. As the notification means 19, a lamp that lights up when the proximity detection switch 66 detects the approach between the receiving hitch 61 and the mounting hitch 62, a buzzer that generates sound, or the like can be used.

  In addition, a spare seedling stage 25 on which replenishment seedlings are placed is arranged on the left and right sides of the front cover 23 in the floor step 20. The preliminary seedling mounting table 25 is rotatably supported by a support shaft (vertical shaft) protruding from the floor surface of the floor step 20 and can be rotated by an operator's hand.

  Further, a fertilizer application device 26 (shown in FIG. 1) is provided behind the cockpit 22 of the traveling vehicle body 2. The fertilizer application device 26 releases the granular fertilizer stored in the fertilizer hopper 27 to the field by a certain amount during planting work.

  The seedling planting device 3 is attached to the rear part of the traveling vehicle body 2, and a seedling planting unit 30 for planting seedlings in the field, and a seedling planting unit lifting mechanism 31 for raising and lowering the seedling planting unit 30 relative to the traveling vehicle body 2. And. The seedling planting part lifting mechanism 31 has a lifting link mechanism 32 provided at the rear part of the traveling vehicle body 2, and the seedling planting part 30 is attached to the traveling vehicle body 2 via the lifting link mechanism 32. Yes. The elevating link mechanism 32 has an upper link 32 a and a lower link 32 b that connect the rear portion of the traveling vehicle body 2 and the seedling planting portion 30, and these links 32 a and 32 b are connected to the rear end of the main frame 10. The seedling planting unit 30 is connected to the standing rear-view portal-type link base frame 33 in a rotatable manner, and the other ends of the links 32a and 32b are rotatably coupled to the seedling planting unit 30. It is connected to the traveling vehicle body 2 so that it can be moved up and down.

  The seedling planting part lifting mechanism 31 has a hydraulic lifting cylinder 34 that expands and contracts by the hydraulic pressure generated by the driving force of the engine 11, and the lifting link mechanism 32 is planted by the expansion and contraction operation of the hydraulic lifting cylinder 34. The part 30 can be moved up and down. The raising / lowering mechanism 31 of the seedling planting part can raise the seedling planting part 30 to a non-working position or lower it to a ground work position (seedling planting position) by its lifting / lowering operation. .

  The seedling planting unit 30 can plant seedlings in a field with a plurality of sections or a plurality of rows in a seedling planting range. The seedling transplanter 1 according to the embodiment is a so-called six-row planting in which seedlings are planted in six sections. The seedling planting unit 30 includes a planting frame (not shown) that can be moved up and down by a lifting link mechanism 32, a planting mechanism 36, a seedling mounting table 37 that is provided at the rear of the traveling vehicle body 2, and a float. 38.

  The rear end of the upper link 32 a and the lower link 32 b of the lifting link mechanism 32 is attached to the planting frame via the attachment / detachment mechanism 6. The seedling stand 37 is provided such as to be superimposed on the planting frame, and is disposed at the rear portion of the traveling vehicle body 2 via the planting frame, the attaching / detaching mechanism 6 and the like. The seedling placing table 37 has seedling placing surfaces 37a corresponding to the number of planting strips partitioned in the left-right direction of the traveling vehicle body 2, and a mat-like seedling with soil can be loaded on each seedling placing surface 37a. It is possible. Thereby, it is not necessary to return the seedlings prepared outside the field every time the seedlings loaded on the seedling platform 37 are planted, and the continuous work can be performed, so that the work efficiency is improved. In addition, the seedling placing stand 37 includes a seedling transporting device 37b that moves the loaded seedlings downward and moves the seedlings to a seedling opening provided at the lower end.

  The planting mechanism 36 is arranged below the seedling stage 37 and plants the seedlings loaded on the seedling stage 37 in the field. The planting mechanism 36 is provided for every two strips, and includes a plurality of planting rods 36c for two strips. In the present embodiment, a total of three planting mechanisms 36 are provided, and each planting mechanism 36 includes two planting ridges 36c per one line. The planting mechanism 36 includes a transmission case 36a extending rearward from the lower end portion of the planting frame, and a rotation support portion 36b rotatably provided on the transmission case 36a with the center portion as a center.

  The rotation support portion 36b rotatably supports two implantation rods 36c corresponding to the respective strips at both ends. The rotation support portion 36 b is rotated around the central portion by the driving force from the engine 11 and rotates the two implantation rods 36 c by the driving force from the engine 11.

  The planting mechanism 36 is configured such that the planting basket 36c is loaded on the seedling table 37 by rotating the planting basket 36c at both ends of the rotation support section 36b while the rotation support section 36b is rotated around the center. Plant the seedlings in the field.

  The float 38 slides on the field with the movement of the traveling vehicle body 2 to level the ground. Three floats 38, one center float 38a provided at the center of the seedling planting portion 30 in the left-right direction of the traveling vehicle body 2, and side floats 38b, 38b provided on the left and right sides of the center float 38a, respectively. It consists of

  Moreover, each float 38a, 38b is rotatably attached so that a front end side may move up and down according to the unevenness | corrugation of the field topsoil surface. The seedling planting device 3 is provided with an angle-of-attack control sensor (not shown) that detects the vertical movement of the center float 38a. In the seedling planting device 3, the vertical movement of the front part of the center float 38a is detected by the angle-of-attack control sensor during planting work, and the hydraulic valve that controls the hydraulic lifting cylinder 34 is switched by the control means 8 according to the detection result. By raising and lowering the seedling planting part 30, the planting depth of the seedling is always kept constant. Moreover, the side float 38b can change the force which presses a front-end part to a farm field by drive sources, such as a motor which is not shown in figure. Further, a water depth sensor (not shown) capable of detecting the water depth of the farm field, a hardness sensor (not shown) capable of detecting the hardness of the farm field, and the like are attached to the side float 38b. The seedling planting unit 30 of the seedling planting device 3 is provided with a horizontal sensor (not shown) that detects the posture (left and right rotation angle) of the seedling planting device 3 around an axis (not shown) along the front-rear direction. ing.

  The power transmission mechanism 4 includes a hydraulic continuously variable transmission 15 as a main transmission, a belt-type power transmission mechanism 16 that transmits driving force from the engine 11 to the hydraulic continuously variable transmission 15, a planting transmission mechanism, and the like. have. First, the hydraulic continuously variable transmission 15 will be described.

  The hydraulic continuously variable transmission 15 is configured as a hydrostatic continuously variable transmission called HST (Hydro Static Transmission). The hydraulic continuously variable transmission 15 includes a hydraulic pump that is driven by a driving force from the engine 11 and a hydraulic motor that outputs a mechanical force (rotational force) by the hydraulic pressure generated by the hydraulic pump. The hydraulic pressure generated by the hydraulic pump is used not only to operate the hydraulic motor but also to operate the hydraulic lifting cylinder 34 of the seedling raising / lowering mechanism 31 described later. The hydraulic continuously variable transmission 15 includes a swash plate (not shown) that can be tilted with respect to an input shaft of a hydraulic pump to which the driving force of the engine 11 is input, and a slant according to a target traveling speed of the traveling vehicle body 2. And a servo motor for changing the inclination angle of the plate. The swash plate is inclined with respect to the input shaft of the hydraulic pump to vary the flow rate of the hydraulic oil supplied from the hydraulic pump toward the hydraulic motor.

  The servo motor for changing the inclination angle of the swash plate is connected to the control means 8, and the control means 8 changes the inclination angle of the swash plate by the servo motor according to the target traveling speed of the traveling vehicle body 2. ing. Specifically, in the case of the stop position where the traveling vehicle body 2 is stopped, the control means 8 brings the swash plate into a neutral state by a servo motor. Here, the neutral state of the swash plate is a state in which the angle formed between the swash plate and the input shaft is 90 °. And if the control means 8 makes a swash plate neutral by a servomotor, a hydraulic pump will make the flow volume of the hydraulic fluid supplied toward a hydraulic motor zero.

  On the other hand, in the case of the forward position for moving the traveling vehicle body 2 forward, the control means 8 changes the inclination angle of the swash plate to be larger on the positive side by the servo motor. Then, the hydraulic pump increases the flow rate of the hydraulic oil supplied toward the hydraulic motor so that the output shaft of the hydraulic motor rotates forward. On the other hand, in the case of the retreat position where the traveling vehicle body 2 is retreated, the control means 8 is changed by the servo motor so that the inclination angle of the swash plate is increased to the negative side. Then, the hydraulic pump increases the flow rate of the hydraulic oil supplied toward the hydraulic motor so that the output shaft of the hydraulic motor rotates in the reverse direction. In the hydraulic motor, the higher the flow rate of the hydraulic oil supplied, the higher the rotation speed of the output shaft.

  For this reason, the hydraulic continuously variable transmission 15 outputs the driving force of the engine 11 as a driving force that drives the traveling vehicle body 2 in the forward direction, outputs it as a braking force that stops the traveling vehicle body 2, 2 can be output as a driving force for driving in the backward direction.

  Again referring to FIG. 1, the hydraulic continuously variable transmission 15 is disposed in front of the engine 11 and below the floor surface of the floor step 20. In the embodiment, the hydraulic continuously variable transmission 15 is disposed in front of the engine 11 when viewed from the upper surface of the traveling vehicle body 2. Further, since the output shaft of the engine 11 protrudes from the left side of the traveling vehicle body 2, the hydraulic continuously variable transmission 15 is arranged close to the left side of the traveling vehicle body 2, and the input shaft 15 a is arranged on the left side of the traveling vehicle body 2. It protrudes from the direction.

  The belt-type power transmission mechanism 16 includes a pulley 41 attached to the output shaft of the engine 11, a pulley 42 attached to the input shaft 15 a of the hydraulic continuously variable transmission 15, and a belt 43 wound around both pulleys 41, 42. And. As a result, the belt-type power transmission mechanism 16 transmits the driving force generated by the engine 11 to the hydraulic continuously variable transmission 15 via the belt 43.

  Further, the power transmission mechanism 4 includes a transmission case (not shown) in which the driving force from the engine 11 is transmitted via the belt-type power transmission mechanism 16 and the hydraulic continuously variable transmission 15. The mission case is attached to the front portion of the main frame 10. In the transmission case, the driving force from the engine 11 transmitted through the belt-type power transmission mechanism 16 and the hydraulic continuously variable transmission 15 is shifted by the auxiliary transmission in the transmission case, and the front wheels 12a and 12a are shifted. The power for traveling to the rear wheels 12b, 12b and the power for planting to the seedling planting device 3 are output separately.

  Of these, the driving power is transmitted to the rear wheel 12b via a drive shaft (not shown) for supplying driving force to the rear wheel 12b provided on the traveling vehicle body 2 and left and right rear wheel gear cases 29. The driving power is transmitted to a front wheel differential device (not shown) and then transmitted to the front wheels 12a via the left and right front wheel final cases 28.

  The left and right front wheel final cases 28 are disposed on the left and right sides of the transmission case, respectively, and the pair of left and right front wheels 12a are connected to the left and right front wheel final cases 28 via front wheel side axles. Further, the front wheel final case 28 is driven in accordance with the steering operation of the handle 24 so that the front wheel 12a can be steered. Similarly, the rear wheel 12b is connected to the left and right rear wheel gear cases 29 via a rear wheel side axle.

  The planting power is transmitted to a planting clutch (not shown) of a planting transmission (not shown) provided at the rear portion of the traveling vehicle body 2, and the seedling planting device is engaged when the planting clutch is engaged. 3 is transmitted. The planting transmission mechanism transmits the driving force from the engine 11 to the seedling planting device 3 as planting power.

  The leveling device 5 is provided below the seedling planting unit 30 of the seedling planting device 3 and leveles the field. The leveling device 5 is provided in front of the seedling planting unit 30.

  As with the floats 38a and 38b, the leveling device 5 is provided between the pair of side rotors 51 provided at the left and right ends of the traveling vehicle body 2 and the pair of side rotors 51 as shown in FIG. The center rotor 50 disposed in front of 51 and a pair of connection transmission mechanisms 52 that connect the left and right ends of the center rotor 50 and the pair of side rotors 51 are provided.

  The longitudinal direction of the center rotor 50 and the pair of side rotors 51 is arranged in parallel with the left-right direction, and is supported by the connecting transmission mechanism 52 so as to be rotatable about the axis. The pair of connection transmission mechanisms 52 rotate the center rotor 50 and the pair of side rotors 51 in conjunction with each other around the axis. The pair of coupling transmission mechanisms 52 are provided with a drive input shaft (not shown) to which the driving force from the engine 11 is transmitted. Thereby, both the center rotor 50 and the side rotor 51 can be rotated by the output from the engine 11.

  The leveling device 5 is provided so as to be movable up and down by a motor attached to a planting frame or the like, a hanging frame, or the like.

  The attachment / detachment mechanism 6 is a mechanism for attaching / detaching the seedling planting device 3 to / from the lift link mechanism 32. 3 and 4, the attachment / detachment mechanism 6 includes a receiving hitch 61, a mounting hitch 62, a rolling shaft 63, a rolling lock member 64, a mounting lock member 65, a proximity detection switch 66 (proximity detection means). Equivalent). When the seedling planting device 3 is attached or detached, the worker can easily approach a place where the worker is difficult to approach when the seedling planting device 3 is attached to the traveling vehicle body 2, so that maintenance work such as cleaning and replacement of parts can be performed efficiently. In addition to this, when performing work in a field other than seedling planting work, it is possible to remove the seedling planting device 3 and mount another work device. Similar to the seedling planting device 3, the working device is provided with the above detaching mechanism 6, and is configured to be detachable similarly to the seedling planting device 3. The work other than planting seedlings is, for example, a sowing work for sowing crop seeds in a field. At this time, a sowing work device that stores seeds and supplies them to the field in a set amount is mounted. Or it is the weeding work which removes the weed which grows by the side of a seedling, At this time, it contacts with the both right and left sides of the planted seedling, and attaches the weeding work apparatus which removes only weed. Alternatively, it is a grooving operation that forms grooves in the field scenes on the left and right sides of the seedling and removes the gas accumulated in the soil while making it easier to take in oxygen. At this time, it is equipped with a grooving device that forms grooves in the field To do.

  As shown in FIG. 5, two receiving hitches 61 are provided with a space in the left-right direction, and each is formed in a flat plate shape extending in the up-down direction. The two receiving hitches 61 are connected by a pair of connecting shafts 67 arranged in parallel with each other in the left-right direction.

  The mounting hitch 62 is attached to the front side of the planting frame of the seedling planting device 3, provided in the seedling planting device 3, and connected to the receiving hitch 61. As shown in FIG. 5, one mounting hitch 62 is provided between the two receiving hitches 61, and is formed in a flat plate shape extending in the vertical direction. The mounting hitch 62 is provided with a connection pin 68 for connecting to the receiving hitch 61. As shown in FIGS. 3 and 4, the connection pin 68 is formed in a columnar shape that protrudes outward in the left-right direction from the lower end portion of the mounting hitch 62. Further, when the mounting hitch 62 is connected to the receiving hitch 61, a hook-like locking portion 62a that locks to the upper side of the upper connecting shaft 67 is provided at the upper end portion, and the lower connecting shaft 67 is passed inward. A concave portion 62b is provided at the lower end.

  In addition, the receiving hitch 61 is provided with a concave portion 61 a through which the connection pin 68 passes when being connected to the mounting hitch 62. The concave portion 61 a is provided at the lower end portion of the receiving hitch 61 and is configured by cutting out a part of the receiving hitch 61 from the rear edge of the receiving hitch 61 toward the front side. The concave portion 61a is formed in an arc shape when viewed from the side.

  The rolling shaft 63 is attached to a planting frame or the like, is attached to the mounting hitch 62 via the planting frame or the like, and the seedling planting device 3 is connected to the axis P ( (Shown in FIGS. 3 and 4). As shown in FIG. 5, the rolling shaft 63 is provided at the center in the left-right direction of the traveling vehicle body 2, and the axis P is disposed parallel to the front-rear direction in plan view. The rolling shaft 63 is rotatably supported by a planting frame or the like by a bearing.

  The rolling lock member 64 is provided at the lower end of the mounting hitch 62 and can regulate the left-right rotation of the seedling planting device 3. The rolling lock member 64 includes a flat lock member main body 64a and a lock pin 64b attached to the upper end of the lock member main body 64a. The lock member main body 64a is rotatably supported by the mounting hitch 62 around the center. The rotation center of the lock member main body 64a is parallel to the left-right direction. A cam surface 64c having a tapered curved surface is formed at the lower end of the lock member main body 64a. The lock pin 64b is formed in a cylindrical shape and protrudes rearward from the upper end portion of the lock member main body 64a. With such an arrangement of the lock pin 64b, the lock member main body 64a, that is, the rolling lock member 64 tries to rotate so that the upper end portion, that is, the lock pin 64b is directed downward.

  In addition, the lock member main body 64a, that is, the rolling lock member 64 is a lock piece in which the lock pin 64b is attached to a planting frame or the like when nothing is in contact with the cam surface 64c of the lock member main body 64a. 69 can enter the lock groove 69a. The lock piece 69 is formed to extend upward, and a lock groove 69a extending downward from the upper edge thereof is formed. When the posture of the seedling planting device 3 around the axis of the rolling shaft 63 is in a horizontal state, that is, when the seedling planting device 3 is not rotated in either the left or right direction, the lock piece 69 has a lock groove 69a formed on the lock pin 64b. The lock pin 64b is provided at a position where it can enter. When the rolling lock member 64 is not in contact with the cam surface 64c or the like of the lock member main body 64a, the lock pin 64b enters the lock groove 69a of the lock piece 69 and the seedling planting device 3 The posture of the seedling planting device 3 is maintained in a horizontal state, that is, in a state where the seedling planting device 3 is not rotated in either the left or right direction by restricting the horizontal rotation. Thus, the rolling lock member 64 restricts the right and left rotation of the seedling planting device 3 when the mounting hitch 62 is not connected to the receiving hitch 61.

  The mounting lock member 65 is provided at the lower end of the receiving hitch 61 and locks the mounting hitch 62 when the mounting hitch 62 is connected to the receiving hitch 61. The mounting lock member 65 includes a flat lock member main body 65a and an operation lever 65b attached to the front end of the lock member main body 65a. The lock member main body 65a is rotatably supported by the mounting hitch 62 around the center. The rotation center of the lock member main body 65a is parallel to the left-right direction. At the rear end portion of the lock member main body 65a, a hook-like locking claw portion 65c that locks to the rear side of the connection pin 68 that has entered the concave portion 61a of the receiving hitch 61 is provided. The locking claw portion 65 c extends from the lower side of the connection pin 68 toward the upper side and is locked to the rear side of the connection pin 68. In addition, a cam surface 65d that can contact the cam surface 64c of the rolling lock member 64 is provided on the outer peripheral surface of the locking claw portion 65c. The cam surface 65d is inclined so as to gradually go downward as it goes to the rear side with the locking claw portion 65c locked to the connection pin 68.

  Further, a torsion coil spring 70 that biases the mounting lock member 65 in a direction in which the locking claw portion 65 c is locked to the connection pin 68 is attached to the front end portion of the lock member main body 65 a of the mounting lock member 65. The torsion coil spring 70 is attached to the front end of the lock member main body 65 a of the mounting lock member 65 and the receiving hitch 61, and is provided in front of the receiving hitch 61 and the mounting hitch 62. With the arrangement of the torsion coil spring 70 as described above, the mounting lock member 65 can be biased in a direction in which the mounting lock member 65 is locked to the connection pin 68 with a compact configuration.

  The operation lever 65 b is formed in a shaft shape extending forward from the lock member main body 65 a in which the locking claw portion 65 c is locked to the rear side of the connection pin 68. The operator can rotate the mounting lock member 65 around the rotation center by pressing the operation lever 65b.

  The mounting lock member 65 locks the mounting hitch 62 so that it does not come off the hitch 61 when the locking claw 65c is locked to the rear side of the connection pin 68 that has entered the recessed portion 61a of the receiving hitch 61. . Further, the mounting lock member 65 has a cam surface 65d that is engaged with the cam surface 64c of the rolling lock member 64 when the engagement claw portion 65c is engaged with the rear side of the connection pin 68 that has entered the recessed portion 61a of the receiving hitch 61. The rolling lock member 64 is rotated in the direction in which the lock pin 64b comes out of the lock groove 69a. Thus, when the mounting hitch 62 is locked by connecting the mounting hitch 62 to the receiving hitch 61, the mounting locking member 65 allows the rolling lock member 64 to allow the seedling planting device 3 to turn left and right.

  The proximity detection switch 66 detects the approach between the receiving hitch 61 and the mounting hitch 62. As the proximity detection switch 66, for example, a known proximity switch is used, and is attached to the receiving hitch 61 in this embodiment. The proximity detection switch 66 outputs the detection result to the control means 8. The proximity detection switch 66 preferably detects that the receiving hitch 61 and the mounting hitch 62 have approached until the connection pin 68 enters the recessed portion 61 a of the receiving hitch 61. Although the connecting pin 68 does not enter into the concave portion 61a of the first mounting portion, the mounting claw portion 65c of the mounting lock member 65 is temporarily rotated by rotating the mounting lock member 65 against the urging force of the torsion coil spring 70. It is only necessary to detect that the receiving hitch 61 and the mounting hitch 62 are close to each other to the extent that can be locked to the rear side of the connection pin 68.

  The rolling mechanism 7 maintains the seedling planting device 3 in a horizontal state that does not rotate left and right around the axis P even when the traveling vehicle body 2 rotates left and right around an axis (not shown) along the front-rear direction. is there. The rolling mechanism 7 is provided between the lifting link mechanism 32 of the traveling vehicle body 2 and the planting frame of the seedling planting device 3.

  As shown in FIGS. 3 and 4, the rolling mechanism 7 includes a rolling cylinder 71, a work device side mounting member 72, and a fixing handle 73. The rolling cylinder 71 is attached to the upper connecting shaft 67 and is disposed between the rear part of the traveling vehicle body 2 and the front part of the seedling planting device 3. The rolling cylinder 71 is attached to the receiving hitch 61 via a connecting shaft 67. The rolling cylinder 71 includes a cylinder body 71a attached to the connecting shaft 67, and a cylinder rod 71b that expands and contracts from the cylinder body 71a when hydraulic oil is supplied into the cylinder body 71a. The longitudinal direction of the cylinder rod 71b is arranged in parallel to the left-right direction, and the expansion / contraction direction of the cylinder rod 71b is parallel to the left-right direction. A screw shaft 75 is provided (attached) via a ball joint 74 at the tip of the cylinder rod 71b.

  The work device side attachment member 72 is attached to the mounting hitch 62. As shown in FIG. 6, when the receiving hitch 61 and the mounting hitch 62 are connected, the work device side mounting member 72 has a mounting hole 72a through which the screw shaft 75 provided at the tip of the cylinder rod 71b of the rolling cylinder 71 passes. have. Further, the work device side mounting member 72 has a tapered surface 72b on the inner surface of the mounting hole 72a. The taper surface 72b is formed so that the mounting hole 72a becomes larger as it gets away from the cylinder main body 71a of the rolling cylinder 71, that is, the diameter becomes larger as it goes from the left and right sides of the body to the other side.

  The fixing handle 73 is screwed onto the outer periphery of the screw shaft 75 passing through the mounting hole 72a, and attaches the rolling cylinder 71, that is, the rolling mechanism 7, to the mounting hitch 62, that is, the seedling planting device 3. The fixing handle 73 includes a screw portion 73a that can be screwed onto the outer periphery of the screw shaft 75, a handle portion 73b provided on the outer periphery of the screw portion 73a, and a tapered surface 73c. As shown in FIG. 7, the handle portion 73b is formed in a flower shape larger than the outer diameter of the screw portion 73a. The handle portion 73b is knurled so that the operator can easily grasp it. The tapered surface 73c is provided on the outer peripheral surface of the threaded portion 73a, and is formed such that the threaded portion 73a has a smaller diameter as it approaches the cylinder body 71a of the rolling cylinder 71. The taper surface 73c of the fixing handle 73 overlaps the taper surface 72b of the work device side mounting member 72 when the threaded portion 73a is screwed onto the outer periphery of the screw shaft 75 passing through the mounting hole 72a. Further, the tapered surface 73c is formed so that the outer diameter gradually decreases as it approaches the cylinder body 71a of the rolling cylinder 71, that is, the taper surface 73c becomes smaller in diameter toward the left and right sides from the other side of the body.

  In the rolling mechanism 7, the screw shaft 75 provided at the tip of the cylinder rod 71 b of the rolling cylinder 71 is passed through the mounting hole 72 a of the work device side mounting member 72, and the screw portion 73 a of the fixing handle 73 is the outer periphery of the screw shaft 75. It is attached to the seedling planting device 3 by being screwed together. The rolling mechanism 7 expands and contracts the cylinder rod 71 b of the rolling cylinder 71 to rotate the seedling planting device 3 left and right with respect to the traveling vehicle body 2 around the axis P of the rolling shaft 63.

  The control means 8 controls the above-described components constituting the seedling transplanter 1. The control means 8 includes, for example, shift control for controlling the hydraulic continuously variable transmission 15, lifting control of the seedling planting unit 30 by the hydraulic lifting cylinder 34 of the seedling planting unit lifting mechanism 31, engine control for controlling the engine 11, Elevation control of the leveling device 5, left-right rotation control of the seedling planting device 3 by the rolling cylinder 71, and the like are executed.

  The control means 8 moves the seedling planting unit 30 to the non-working position by the hydraulic lifting cylinder 34 during turning during the planting work on the field based on the detection result from the detection sensor for detecting the steering angle of the handle 24. The seedling planting unit 30 is lowered to the ground work position during straight running during the planting work on the farm field.

  The control means 8 expands and contracts the cylinder rod 71b of the rolling cylinder 71 based on the detection result of the horizontal sensor during planting work on the farm field, and the traveling vehicle body 2 is tilted around an axis (not shown) along the front-rear direction. Even so, the seedling planting device 3 is horizontally rotated about the axis P of the rolling shaft 63 with respect to the traveling vehicle body 2 to maintain the seedling planting device 3 in a horizontal state.

  In the seedling transplanting machine 1 described above, when seedlings are planted in the field, the seedling planting device 3 is lowered to the ground work position (seedling planting position) by the operation of various operation levers by the operator. Then, the seedling transplanter 1 leveles the surface of the field by rotating the rotors 50 and 51 of the leveling device 5 while traveling in the field. Then, the seedling transplanter 1 transplants at both ends of the rotation support portion 36b while the rotation support portion 36b rotates about the center while reciprocating the seedling mount 37 of the seedling planting portion 30 in the left-right direction.杆 36c rotates to plant seedlings in the field.

  In addition, when the seedling transplanter 1 finishes planting seedlings in the field, the seedling planting device 3 is raised to the non-working position by the seedling planting unit lifting mechanism 31 by the operation of various operation levers by the operator. And the seedling transplanter 1 moves between farm fields or moves outside the farm fields.

  Next, a procedure for mounting the seedling planting device 3 on the rear part of the traveling vehicle body 2 of the seedling planting device 1 will be described with reference to the drawings. FIG. 9 is a side view showing a state in which the mounting lock member of the seedling transplanter according to the embodiment is rotated against the urging force of the torsion coil spring. FIG. 10 is a side view illustrating a state in which the mounting lock member of the seedling transplanter according to the embodiment is in contact with the rolling lock member. FIG. 11 is a cross-sectional view showing a state in which the lock pin of the seedling transplanter according to the embodiment has come out of the lock groove.

  When the seedling transplanter 1 mounts the seedling planting device 3 on the rear part of the traveling vehicle body 2, the receiving hitch 61 provided on the lifting link mechanism 32 of the traveling vehicle body 2 is mounted on the mounting hitch 62 of the seedling planting device 3. The operator causes the traveling vehicle body 2 to travel so as to approach. In this state, as shown in FIG. 3, the mounting lock member 65 is positioned at a position where it can be locked to the rear side of the connection pin 68 by the biasing force of the torsion coil spring 70. Further, as shown in FIG. 8, the lock pin 64 b of the rolling lock member 64 enters the lock groove 69 a of the lock piece 69, and the rolling lock member 64 is the axis of the rolling shaft 63 of the seedling planting device 3. Left and right rotation around P is restricted.

  Then, when the proximity detection switch 66 detects the approach between the receiving hitch 61 and the mounting hitch 62 and the notifying means 19 notifies that the approaching between the receiving hitch 61 and the mounting hitch 62 is detected, the operator moves the traveling vehicle body 2. Stop. Then, the operator locks the locking portion 62a of the mounting hitch 62 on the upper side of the upper connecting shaft 67 and operates the operation lever 65b of the mounting lock member 65, as shown in FIG. 65 is once rotated against the biasing force of the torsion coil spring 70. Then, the operator stops the operation of the operation lever 65b, rotates the mounting lock member 65 by the urging force of the torsion coil spring 70, and engages the locking claw portion 65c of the mounting lock member 65 with the rear side of the connection pin 68. Try to stop. Then, as shown in FIG. 10, the cam surface 65 d provided on the locking claw portion 65 c of the mounting lock member 65 contacts the cam surface 64 c provided on the lower end portion of the rolling lock member 64. Then, when the mounting lock member 65 tries to be engaged with the rear side of the connection pin 68 and is rotated by the urging force of the torsion coil spring 70, the cam surfaces 64c and 65d come into contact with each other, so that the mounting lock member 65 becomes the rolling lock member. 64 is rotated in the direction in which the lock pin 64b comes out of the lock groove 69a. Then, when the locking claw portion 65 c of the mounting lock member 65 is locked to the rear side of the connection pin 68, the connection pin 68 is positioned behind the concave portion 61 a of the receiving hitch 61, and the mounting hitch 62 is mounted on the receiving hitch 61. The seedling planting device 3 is attached to the rear part of the traveling vehicle body 2 by connecting.

  When the seedling planting device 3 is not attached to the rear part of the traveling vehicle body 2, the control means 8 reduces the cylinder rod 71b of the rolling cylinder 71 from a neutral position where the seedling planting device 3 is in a horizontal state. When the mounting hitch 62 is connected to the receiving hitch 61, the cylinder rod 71b of the rolling cylinder 71 is extended to the neutral position. Then, the screw shaft 75 provided at the tip of the cylinder rod 71b passes through the mounting hole 72a. The operator then attaches the rolling cylinder 71 to the seedling planting device 3 by screwing the fixing handle 73 onto the screw shaft 75 that has passed through the mounting hole 72a. Thus, the seedling planting device 3 is attached to the rear portion of the traveling vehicle body 2. When the seedling planting device 3 is removed from the rear part of the traveling vehicle body 2, the procedure is the reverse of the procedure for mounting.

  As described above, according to the configuration of the seedling transplanter 1 of the present embodiment, when the mounting hitch 62 is not connected to the receiving hitch 61, the rolling lock member 64 rotates the seedling planting device 3 in the horizontal direction. regulate. For this reason, since the seedling transplanting device 1 is restricted from turning in the left-right direction until the seedling planting device 3 is mounted on the lifting link mechanism 32, the seedling planting device 1 is mounted before the seedling planting device 3 is mounted. Since it can prevent that 3 rotates right and left, the time and labor which an attachment / detachment operation | work of the seedling planting apparatus 3 requires are reduced. Therefore, the seedling transplanter 1 can easily perform the attaching / detaching operation of the seedling planting device 3.

  Further, in the seedling transplanting machine 1, when the mounting lock member 65 connects the mounting hitch 62 to the receiving hitch 61 and locks the mounting hitch 62, the mounting lock member 65 turns the seedling transplanting device 3 to the left and right. Is allowed. For this reason, in the seedling transplanting machine 1, when the mounting hitch 62 is connected to the receiving hitch 61 and the seedling transplanting device 1 is mounted on the lifting link mechanism 32, the seedling transplanting device 3 is rotatable in the left-right direction. Therefore, when the seedling transplanting device 1 is mounted on the lifting / lowering link mechanism 32, the seedling transplanting device 3 is rotatable in the left-right direction. Labor can be reduced.

  Further, the seedling transplanter 1 forms a tapered surface 72b in the mounting hole 72a of the work device side mounting member 72 through which the screw shaft 75 mounted on the cylinder rod 71b of the rolling cylinder 71 passes, and the fixing handle 73 also has a tapered surface 73c. Is forming. For this reason, when attaching the rolling cylinder 71 to the seedling planting device 3, since the taper surfaces 72b and 73c overlap each other, if the fixing handle 73 is fastened to the screw shaft 75, it is difficult to loosen without using other tools. The seedling planting apparatus 3 can be easily attached / detached without a tool, and the efficiency of the attaching / detaching work is improved.

  Further, when the seedling transplanter 1 moves the traveling vehicle body 2 to a position where it can be connected to the lifting link mechanism 32 and the seedling transplanting device 3, it is confirmed that the receiving hitch 61 and the mounting hitch 62 have approached by the notification means 19. Since it is notified, the manpower required for the detachment work of the seedling planting device 3 is reduced.

[Modification 1]
A seedling transplanter 1 according to Modification 1 of the embodiment of the present invention will be described with reference to FIG. FIG. 12 is a top view of the rolling mechanism of the seedling transplanter according to the first modification of the embodiment. In FIG. 12, the same parts as those of the embodiment are denoted by the same reference numerals and the description thereof is omitted.

  In the seedling transplanter 1 according to the first modification of the embodiment, the rolling mechanism 7 includes a rolling cylinder 71, a ball joint 74 (corresponding to a rod end), and a screw member 76 with a grip. The ball joint 74 is provided at the tip of the rolling cylinder 71. The ball joint 74 is provided with a screw hole 74a penetrating the central portion of the ball joint 74 in the front-rear direction.

  The screw member with grip 76 is screwed into the screw hole 72c of the work device side mounting member 72 provided in the seedling planting device 3 through the screw hole 74a of the ball joint 74. The screw hole 72c of the work device side mounting member 72 is disposed in parallel with the front-rear direction. The screw member with grip 76 includes a screw portion 76a that is screwed into the screw holes 74a and 72c, and a grip portion 76b that is provided on the outer periphery of the screw portion 76a and can be gripped by an operator. The screw portion 76a and the grip portion 76b are arranged coaxially. In the rolling cylinder 71 of the rolling mechanism 7 of the seedling transplanter 1 according to the first modification of the embodiment, the threaded portion 76a is screwed into the threaded hole 74a of the ball joint 74 and the threaded hole 72c of the work device side mounting member 72. And attached to the seedling planting device 3.

  According to the seedling transplanter 1 according to the first modification of the embodiment, the screw hole 74a through which the screw member with grip 76 is passed is provided in the ball joint 74 attached to the cylinder rod 71b of the rolling cylinder 71. For this purpose, the screw rod 76 with the grip is screwed into the screw hole 74 a of the ball joint 74 and the screw hole 72 c of the work device side mounting member 72 provided in the seedling planting device 3. 71 b is configured to be detachable from the seedling planting device 3. Therefore, the seedling transplanter 1 can be made difficult to remove even if the operator turns the gripped screw member 76 by hand and attaches the cylinder rod 71b of the rolling cylinder 71, so that the rolling cylinder 71 functions during the operation. It is prevented from disappearing. Moreover, the attachment / detachment work of the seedling planting device 3 can be easily performed without a tool, and the work efficiency of the attachment / detachment work is improved.

[Modification 2]
A seedling transplanter 1 according to Modification 2 of the embodiment of the present invention will be described with reference to FIG. FIG. 13 is a side view illustrating a state in which the receiving hitch and the mounting hitch of the seedling transplanter according to the second modification of the embodiment are connected. In FIG. 13, the same parts as those of the embodiment are denoted by the same reference numerals and the description thereof is omitted.

  In the seedling transplanter 1 according to the second modification of the embodiment, as shown in FIG. 13, an automatic lock adjustment unit 80 is provided in the receiving hitch 61. The automatic lock adjusting portion 80 is for locking the locking claw portion 65c of the mounting lock member 65 to the rear side of the connection pin 68 when the seedling planting device 3 is raised by the hydraulic lifting cylinder 34. .

  The automatic lock adjustment unit 80 includes a lock side member 81 provided at the front end portion of the mounting lock member 65, and a bolt 82 that is screwed into the lock side member 81. When the bolt 82 is screwed into the lock side member 81, the head 82a can contact the lower link 32b when the seedling planting device 3 is raised. The bolt 82 can be changed in the amount of screwing into the lock side member 81, that is, the amount of protrusion of the head 82 a from the lock side member 81.

  When the seedling planting device 3 is raised, the automatic lock adjustment unit 80 makes the head 82a of the bolt 82 contact the lower link 32b and is pressed from the lower link 32b. The portion 65 c is locked to the rear side of the connection pin 68. Moreover, the automatic lock adjustment part 80 can aim at commonality also in various types of seedling planting apparatuses 3, by changing the protrusion amount from the lock side member 81 of the head 82a of the bolt 82, and seedling transplantation The cost of the machine 1 can be reduced.

[Modification 3]
A seedling transplanter 1 according to Modification 3 of the embodiment of the present invention will be described with reference to FIG. FIG. 14 is a block diagram illustrating a schematic configuration of a seedling transplanter according to Modification 3 of the embodiment. In FIG. 14, the same parts as those of the embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 14, the seedling transplanter 1 according to the third modification of the embodiment includes a driven gear 90 (driven rotation body), an attachment / detachment switching actuator 91, an operation member 92, and the like. The driven gear 90 is disposed coaxially with the rotation center of the mounting lock member 65, is fixed to the mounting lock member 65, and is rotatably provided integrally with the mounting lock member 65.

  The attachment / detachment switching actuator 91 has a drive gear 91a (drive rotator) that rotates the driven gear 90. The attachment / detachment switching actuator 91 is a motor and is attached to the receiving hitch 61. The attachment / detachment switching actuator 91 has a drive gear 91a attached to the output shaft. The drive gear 91a meshes with the driven gear 90. The attachment / detachment switching actuator 91 rotates the drive gear 91a to position the attachment lock member 65 at a position where the engagement claw portion 65c engages the rear side of the connection pin 68, and the connection claw portion 65c to the connection pin 68. The mounting lock member 65 is rotated integrally with the driven gear 90 over the position where the locking is released.

  The operation member 92 is provided at an upper portion of the front cover 23 of the traveling vehicle body 2 and is provided at a position on the cockpit 22 that can be operated by an operator. The operation member 92 operates the attachment / detachment switching actuator 91 so as to switch between a position where the locking claw portion 65c is locked to the rear side of the connection pin 68 and a position where the locking claw portion 65c is unlocked. belongs to. The operation member 92 is operated, for example, by swinging or rotating in one direction from the neutral position to operate the attachment / detachment switching actuator 91 so that the locking claw portion 65c is locked to the rear side of the connection pin 68. Then, the attachment / detachment switching actuator 91 is operated so as to be in a position to release the locking of the locking claw portion 65c by swinging or rotating in the other direction from the neutral position. The operation member 92 outputs an operation signal from the operator to the control means 8.

  In the seedling transplanting machine 1 according to the third modification of the embodiment, the control means 8 mounts the attachment / detachment switching actuator 91 on the attachment lock member 65 based on the operation signal from the operation member 92 (that is, by operation of the operation member 92). The hitch 62 is driven in the locking direction. Further, the control means 8 drives the attachment / detachment switching actuator 91 in a direction in which the attachment lock member 65 releases the lock of the attachment hitch 62 based on an operation signal from the operation member 92 (that is, by operation of the operation member 92).

  Further, when the control means 8 releases the lock of the mounting hitch 62 of the mounting lock member 65 from the state where the mounting lock member 65 locks the mounting hitch 62, the cam surface 65 d of the mounting lock member 65 is moved to the rolling lock member 64. Apart from the cam surface 64c, the lock pin 64b of the rolling lock member 64 enters the lock groove 69a, and the rolling lock member 64 restricts the right and left rotation of the seedling planting device 3. Then, the control means 8 lowers the seedling planting device 3 to the lifting link mechanism 32 and lowers the seedling planting device 3 onto the farm field, and after a predetermined time has elapsed, the control vehicle 8 moves the traveling vehicle body 2 to the power transmission mechanism 4 by a predetermined distance. Move forward. Thus, in the seedling transplanting machine 1 according to the third modification of the embodiment, when removing the seedling planting device 3 from the rear part of the traveling vehicle body 2, it can be automatically performed by operating the operation member 92.

  According to the seedling transplanting machine 1 according to the third modification of the embodiment, when the attachment / detachment switching actuator 91 is driven to release the lock of the mounting lock member 65, the seedling planting device 3 is rotated to the left and right by the rolling lock member 64. Let it be regulated. For this reason, when removing the seedling planting apparatus 3, it can suppress that the seedling planting apparatus 3 rotates left and right.

  Further, when the lock of the mounting lock member 65 is released, the seedling planting device 3 is lowered onto the field and the traveling vehicle body 2 is advanced after a predetermined time has elapsed. The seedling planting device 3 can be removed. Therefore, when removing the seedling planting device 3, the seedling transplanting machine 1 does not require any operation other than the operation member 92, so that the work efficiency is improved and the manpower required for the work of attaching and detaching the seedling planting device 3 is reduced. The

[Modification 4]
A direct seeding machine 1-1 as a work vehicle according to Modification 4 of the embodiment of the present invention will be described with reference to FIGS. FIG. 15 is a plan view showing a float and a grooving machine of a direct seeding machine according to Modification 4 of the embodiment. 16 is a cross-sectional view taken along line XVI-XVI in FIG. 17 is a cross-sectional view taken along line XVII-XVII in FIG. 15 to 17, the same parts as those in the embodiment are denoted by the same reference numerals and the description thereof is omitted.

  The direct sowing machine 1-1 as a work vehicle according to the fourth modification of the embodiment is a work vehicle that sows seeds directly on a farm field. As shown in FIG. 15, the direct seeder 1-1 is provided with two center floats 38a at intervals in the left-right direction. Partition plates 100 are provided at the left and right ends of the rear edge of the center float 38a and the side float 38b. The partition plate 100 protrudes rearward from the left and right ends of the rear edge portions of the center float 38a and the side float 38b.

  Moreover, as shown in FIG. 15, the direct sowing machine 1-1 is provided with the draining grooving machine 101 between the adjacent center float 38a and the side float 38b. The grooving machine 101 is attached to a rear end portion of an arm 103 extending rearward from a machine frame 102 extending in the left-right direction. The grooving machine 101 has a V-shaped cross section as shown in FIG. 16 at the front side of the rear end of the partition plate 100, and the rear side of the rear end of the partition plate 100 as shown in FIG. The cross section is M-shaped.

  According to the direct seeding machine 1-1 as a work vehicle according to the fourth modification of the embodiment, the grooving machine 101 is formed in a V-shaped cross section on the front side from the rear end of the partition plate 100, and the rear of the partition plate 100. Since the rear side of the end is formed in an M-shaped cross section, mud removal of the grooving machine 101 is good, and mud pushing to the sowing part can be suppressed.

  In addition, the seedling transplanter 1 as a work vehicle according to the above-described embodiment may be provided with an electric accelerator dial on the upper portion of the front cover 23. In this case, in a state where the seedling planting device 3 is removed from the rear portion of the lifting link mechanism 32 of the traveling vehicle body 2, the control means 8 causes the traveling vehicle body 2 to travel in a low speed state even when the electric accelerator dial is operated to the high speed side. Is desirable. Further, in a state where the seedling planting device 3 is removed from the rear part of the lifting link mechanism 32 of the traveling vehicle body 2, the control means 8 resets the electric accelerator dial to the low speed side even if the electric accelerator dial is operated to the high speed side. Is desirable. In this case, it is possible to suppress the traveling vehicle body 2 from being suddenly started with the seedling planting device 3 separated.

  In addition, this invention is not limited to the said embodiment and modification. That is, combinations can be changed or various modifications can be made without departing from the scope of the present invention.

1 Seedling transplanter (work vehicle)
1-1 Direct seeding machine (work vehicle)
2 Traveling body 3 Seedling planting device (working device)
8 Control means 19 Notification means 32 Elevating link mechanism 61 Receiving hitch 62 Mounting hitch 63 Rolling shaft 64 Rolling lock member 65 Mounting lock member 66 Proximity detection switch (proximity detection means)
71 Rolling cylinder 71a Cylinder body 71b Cylinder rod 72 Work device side mounting member 72a Mounting hole 72b Tapered surface 72c Screw hole 73 Fixed handle 73c Tapered surface 74 Ball joint (rod end)
74a Screw hole 75 Screw shaft 76 Screw member with grip 90 Driven gear (driven rotor)
91 Detachable switching actuator 91a Drive gear (drive rotator)
92 Operation members

Claims (6)

An elevating link mechanism provided at the rear of the traveling vehicle body;
A receiving hitch provided in the elevating link mechanism and mounted with a working device;
A mounting hitch provided on the working device and connected to the receiving hitch;
In a work vehicle provided with a rolling shaft attached to the mounting hitch and rotating the work device left and right,
A rolling lock member provided in the mounting hitch and capable of regulating the left-right rotation of the working device;
A mounting lock member that is provided on the receiving hitch and that locks the mounting hitch when the mounting hitch is connected to the receiving hitch;
The rolling lock member restricts the left-right rotation of the working device when the mounting hitch is not connected to the receiving hitch,
The working vehicle, wherein when the mounting hitch is connected to the receiving hitch and the mounting hitch is locked, the rolling lock member allows the working device to rotate left and right. A rolling cylinder provided between the traveling vehicle body and the working device;
A mounting hole that is provided in the working device and passes through a screw shaft provided at a tip of a cylinder rod of the rolling cylinder, and a tapered surface that increases in diameter as the mounting hole is separated from the cylinder body of the rolling cylinder. A work device side mounting member having,
An adhering handle having a tapered surface screwed into the screw shaft and having a smaller diameter as it approaches the cylinder body of the rolling cylinder;
The work vehicle according to claim 1, further comprising: A rolling cylinder provided between the traveling vehicle body and the working device;
A rod end provided at a tip of a cylinder rod of the rolling cylinder and provided with a screw hole;
A screw member with a grip that passes through the screw hole of the rod end and is screwed into the screw hole provided in the working device;
The work vehicle according to claim 1, further comprising: A driven rotator that is rotatably provided integrally with the mounting lock member;
A detachable switching actuator having a drive rotator for rotating the driven rotator,
The work vehicle according to any one of claims 1 to 3, wherein an operating member that operates the attachment / detachment switching actuator is provided in the traveling vehicle body. Control means for driving the attachment / detachment switching actuator in a direction in which the attachment lock member releases the lock of the attachment hitch by operation of the operation member,
When the control means releases the lock of the mounting hitch of the mounting lock member,
The rolling lock member restricts the left-right rotation of the working device, the lifting link mechanism lowers the working device, and the traveling vehicle body is advanced after a predetermined time elapses after the working device is lowered. The work vehicle according to claim 4, wherein Proximity detection means for detecting the proximity of the receiving hitch and the mounting hitch;
Informing means provided at a position visible from the cockpit of the traveling vehicle body, and notifying that the proximity detecting means has detected the proximity of the receiving hitch and the mounting hitch,
The work vehicle according to any one of claims 1 to 5, further comprising:

Images