JP2016187362A - Work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ground leveling device which can prevent generation of a rough field face having many irregularities.SOLUTION: The work machine includes: a work part on a rear side of a travel vehicle body 2 via a lifting link device 3; a float 55 on a lower part of the work part; a fertilization device 5 feeding a fertilizer; an attachment body arranged in the work part and in an inclined posture from an upper side of the float 55 toward a rear side of the float 55; and a gutter-forming body 63 arranged in the attachment body and forming a gutter on a field face with a V-shaped folded plate 63b. The attachment body is formed to be thinner than a width of the gutter-forming body 63. In the gutter-forming body 63, a V-shaped angle of the folded plate 63b can be changed. The work machine further includes: a ground leveling rotor 27 arranged on a front side of the float 55 and leveling a field face; a ground leveling link member 6 and an electric motor 7 arranged in the work part 4 and moving vertically the ground leveling rotor 27; and a grounding switch 84 detecting grounding of the ground leveling rotor 27. When the grounding switch 84 gets in a detection state, operation of the electric motor 7 is stopped.SELECTED DRAWING: Figure 15

Description

  The present invention relates to a work machine.

  In a working machine (sometimes referred to as a seedling transplanter) equipped with a seedling planting device with a float, a leveling device for leveling the field immediately before seedling planting by the seedling planting device (hereinafter referred to as a leveling rotor) There is a known configuration including The following Patent Document 1 has a configuration in which a central leveling device and three leveling devices are arranged on the left and right sides of the seedling transplanter so that the entire width of the seedling transplanting machine is divided into three, and the central leveling device is arranged in front of the left and right leveling devices. It is disclosed.

JP 2009-118848 A JP 2007-312661 A

  In the seedling transplanter disclosed in the above-mentioned patent document, three leveling devices (leveling rotors) on the left and right sides and the center for leveling the field scene on the front side of the planting device and making it easy to plant seedlings are provided integrally with the seedling mount. Therefore, when the seedling platform is raised, the leveling rotor is also raised in conjunction with it.

  For this reason, when turning the aircraft at the field edge, etc., if the seedling platform is raised, the leveling rotor cannot be brought into contact with the field scene, and tire turning marks that occur during the turn are left in the field scene. I was sorry. Since the turning trace of the tire is formed by receiving the weight of the seedling transplanter, it is relatively deep, and since the amount of soil to be lifted is large, the unevenness of the farm scene becomes intense.

  If the seedling planting work at the end of the field, which is the final process, is left as it is, the unevenness of the field scene cannot be leveled by the leveling rotor, and if the seedling is planted in the recess, the planting depth becomes shallower. , Seedlings are washed away by water flow and wind, resulting in missing stocks or dense growth in other locations, which makes it difficult to perform post-weeding operations, spraying chemicals such as agricultural chemicals, and harvesting crops smoothly. There's a problem.

  In addition, if seedlings are planted on the convex part of the field scene that has not been leveled, not only the root part of the seedling but also the leaf part will enter the soil, so it will not be able to receive enough sunlight and cause poor growth. There is a problem.

  Furthermore, since the leveling rotor is arranged in a substantially parallel posture in the left-right direction of the machine body, and the front side of the float provided at the lower part of the seedling platform has a linear shape in the left-right direction of the machine body, mud generated by the leveling rotor is left and right of the float. The problem is that the water that has flowed into the water and has become heavier and contains mud will wash away the shallow seedlings, and that mud will accumulate around the seedlings and reduce the sunlight that the leaves should receive. .

And in order to improve the flow of muddy water, there are cases where grooves are formed in the field by the grooved body, but mud generated when the grooved body cuts the groove is pushed out to the periphery, and the problem of roughening the field scene is there.

  It is an object of the present invention to provide a leveling device that does not create rough farm fields with many irregularities.

  The above-mentioned problem of the present invention is solved by the following means.

According to the first aspect of the present invention, a working part is provided on the rear side of the traveling vehicle body (2) via the lifting link device (3), a float (55) is provided at the lower part of the working part , and fertilizer is supplied to the field. In the working machine provided with the device (5), an attachment body is provided in the working portion in an inclined posture from above the float (55) toward the rear of the float (55), and the attachment body has a V-shape in a rear view. The working machine is characterized in that a grooved body (63) for forming a groove in a farm scene is provided by a bent plate (63b), and the attachment body is formed narrower than the width of the grooved body (63). .

The invention according to claim 2 is the working machine according to claim 1, wherein the groove body (63) is configured to be able to change a V-shaped angle of the bent plate (63b) .

According to a third aspect of the present invention, a leveling rotor (27) for leveling a farm scene is provided in front of the float (55), and a leveling link member (6) for moving the leveling rotor (27) up and down in the working unit and an electric motor. A motor (7) is provided, and the ground leveling rotor (27) is provided with a grounding switch (84) for detecting the grounding of the leveling rotor (27). When the grounding switch (84) is in a detection state, the electric motor (7) The working machine according to claim 1, wherein the operation is stopped .

According to a fourth aspect of the present invention, the leveling rotor (27) includes a leveling rotator (27b) provided in front of the float (55) and a sub-leveling rotator provided on the left and right outer sides of the leveling rotator (27b). (27a), a drive shaft (70b) for rotating the leveling rotator (27b) is provided, a sub drive shaft (70a) for rotating the left and right sublevel rotators (27a) is provided, and a drive shaft ( 70b) and the auxiliary drive shaft (70a) are provided with a transmission shaft case (73) for accommodating the transmission shafts (73a, 73b), and the bearing portion (73c) of the drive shaft (70b) is provided in the transmission shaft case (73). ) And the bearing portion (73c) of the drive shaft (70b) is covered with a central hub portion (70b2) or a collar (70b3) formed on the leveling rotator (27b), and the transmission shaft case (73) and left and right side The outer hub portion (87) provided between the ground rotating body (27a) and the stay (86) for holding the left and right leveling rotating bodies (27a) are connected by a U-shaped tube (88) having an opening at the bottom. The support pipe (65) for suspending the leveling rotator (27b) and the left and right auxiliary leveling rotators (27a) is connected to a U-shaped tube (88). The working machine described.

According to invention of Claim 1, it is set as the structure which a groove formation body (63) reaches in a farm field by comprising the attachment body of a groove formation body (63) from back to upper part of a float (55). I can .

Further, since the attachment body for attaching the groove body (63) is formed to be narrower than the width of the groove body (63), the mud that the groove body (63) pushes away becomes better, so mud around Push is suppressed.

According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, when the V-shaped angle of the bent plate (63b) of the grooved body (63) is changed, the field is soft, etc. Can improve mud drainage and reduce mud pushing .

According to invention of Claim 3, in addition to the effect of invention of Claim 1, when the leveling link member (6) is moved up and down by the electric motor (7), the vertical position of the leveling rotor (27) is changed. Can

Further, when the grounding switch (84) detects the grounding of the leveling rotor (27), the electric motor (7) is stopped, so that the leveling rotor (27) is automatically set to the working height. 27) can surely level the unevenness of the field scene.

According to the invention described in claim 4, in addition to the effect of the invention described in claim 3, the central hub portion (70b2) for forming the bearing portion (73c) of the drive shaft (70b) on the leveling rotator (27b). Alternatively, since the collar (70b3) is configured to cover the drive shaft (70b), it is possible to prevent the foreign matter from being wound around the drive shaft (70b).

Further, the leveling rotator (27b) and the auxiliary leveling rotator are connected to the U-shaped tube (88) by connecting the support pipe (65) for suspending the leveling rotator (27b) and the auxiliary leveling rotator (27a). Since (27a) can be prevented from being held in a twisted posture, durability is improved. Thereby, since it is not necessary to thicken the components which support the leveling rotator (27b) and the sub-leveling rotator (27a), the support structure of the leveling rotator (27b) and the sub-leveling rotator (27a) Weight reduction can be achieved .

It is a side view of the riding type rice transplanter of the Example of this invention. It is a top view of the riding type rice transplanter of FIG. It is an enlarged view centering on the power transmission system to the rotor of the rice transplanter of FIG. FIG. 2 is an enlarged view of a central rotor and a pair of transmission shaft case portions of the rice transplanter of FIG. 1. It is a side view which shows the state which raised the seedling planting part of the rice transplanter of FIG. 1 about 30 cm with respect to the field scene. It is a side view which shows a state when raising the seedling planting part of the rice transplanter of FIG. 1 when raising the seedling planting part while turning the field. It is explanatory drawing of the action | operation of the action | operation detection switch which detects the motion of the piston of the hydraulic cylinder which raises / lowers the seedling planting part of the rice transplanter of FIG. The flowchart which links | relates and controls operation | movement of the seedling planting apparatus of the rice transplanter of FIG. 1 and operation | movement of a leveling rotor is shown. It is a block diagram for raising / lowering control of the seedling planting part and leveling rotor of the rice transplanter of FIG. FIG. 2 is a plan view in which a pair of ground leveling rotors are arranged in an inverted “C” shape in a seedling planting portion of the rice transplanter of FIG. 1. FIG. 2 is a plan development view of a both-end holding device for a rotor case at the center of the rice transplanter of FIG. FIG. 2 is an exploded plan view in which a hub portion of a second drive shaft of a rotor at the center of the seedling transplanter of the rice transplanter in FIG. FIG. 3 is an exploded plan view in which a winding prevention collar that covers a bearing portion of the transmission shaft of the transmission shaft case is attached to a connection portion between the second drive shaft of the central rotor of the rice transplanter of FIG. 1 and the transmission shaft of the transmission shaft case. FIG. 14 is a side view of the machine body showing a configuration in which a grooving body is provided on both sides of the center float and side float of the seedling planting part of the rice transplanter in FIG. FIG. 14A is a rear view (FIG. 14B) and a plan view (FIG. 14C). It is the body side view which provided the grooving body in the seedling planting part of the rice transplanter of FIG. The machine body side view (FIG. 16 (a)) which shows the structure which provided the grooved body attached to the seedling planting part of the rice transplanter of FIG. 1, and the side view (FIG. 16 (b)) of the grooved body and the attached body It is a front view (FIG.16 (c)). It is the body side view which provided the grooving body in the seedling planting part of the rice transplanter of FIG.

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

  FIG. 1 and FIG. 2 are a side view and a plan view of a riding type rice transplanter equipped with a fertilizer application device as a granular material feeding device which is a typical example of the seedling transplanter of the present invention. In this riding type rice transplanter 1 with a fertilizer application, a seedling planting portion 4 is mounted on the rear side of the traveling vehicle body 2 via an elevating link device 3 so that the seedling planting portion 4 can be moved up and down. Is provided. The boarding operator refers to the left and right directions in the forward direction of the seedling transplanter as left and right, respectively, and the forward and backward directions are referred to as forward and backward, respectively.

  The traveling vehicle body 2 is a four-wheel drive vehicle including a pair of left and right front wheels 10 and 10 and a pair of left and right rear wheels 11 and 11 as drive wheels, and a transmission case 12 is disposed at the front of the fuselage. Front wheel final cases 13, 13 are provided on the left and right sides of the case 12, and the left and right front wheels are mounted on the left and right front wheel axles projecting outward from the respective front wheel support portions capable of changing the steering direction of the left and right front wheel final cases 13, 13. 10 and 10 are respectively attached.

  Further, the front end portion of the main frame 15 is fixed to the rear portion of the transmission case 12, and a rear wheel gear case 18, with a rear wheel rolling shaft provided horizontally in the front and rear sides at the rear left and right center of the main frame 15 as a fulcrum. The rear wheels 11 and 11 are attached to a rear wheel axle that is supported in a freely rolling manner and projects outwardly from the rear wheel gear cases 18 and 18.

  The engine 20 is mounted on the main frame 15, and the rotational power of the engine 20 is transmitted to the transmission in the transmission case 12 via a belt transmission device and a hydraulic continuously variable transmission (HST) 23 (not shown). The The rotational power transmitted to the transmission is shifted and then separated from the traveling power and the externally extracted power and taken out from the transmission. A part of the traveling power is transmitted to the front wheel final cases 13 and 13 to drive the front wheels 10 and 10, and the rest is transmitted to the rear wheel gear cases 18 and 18 to drive the rear wheels 11 and 11. Further, the external take-out power is transmitted to a planting clutch case 25 provided at the rear part of the traveling vehicle body 2, and then transmitted to the seedling planting unit 4 by a planting transmission shaft 26, and a fertilizer transmission mechanism (not shown). Is transmitted to the fertilizer application 5.

  The upper part of the engine 20 is covered with an engine cover 30, and a seat 31 is installed thereon. A front cover 32 incorporating various operation mechanisms is provided in front of the seat 31, and a handle 34 for steering the front wheels 10 and 10 is provided above the front cover 32. A reservoir tank 16 is provided in the front cover 32 and is connected to the HST 23 by a pipe 19 so that oil is supplied to the HST 23 from a high position.

  The engine cover 30 and the front cover 32 have horizontal floor steps 35 on the left and right sides of the lower end.

  The floor step 35 is formed with a lattice 35a having a through-hole, so that a driver who is seated on the seat 31 and controls the aircraft can see the left and right front wheels 10 and 10 and is easy to control. At the same time, mud on the shoes of the worker walking in the step 35 falls on the field. The rear portion of the floor step 35 is a rear wheel fender 36 that also serves as a rear step.

  Further, on both the left and right sides of the front part of the traveling vehicle body 2, spare seedling platforms 38 and 38 (not shown in FIG. 1) on which replenishment seedlings are placed are housed in a position where they protrude laterally from the body. It is provided to be able to rotate at the position.

  The elevating link device 3 has a parallel link configuration, and includes one upper link 40 and a pair of left and right lower links 41, 41. These links 40, 41, 41 are pivotally attached to a rear-view portal-shaped link base frame 42 erected on the rear end of the main frame 15, and a vertical link 43 is connected to the tip side. ing. Then, a connecting shaft (not shown) rotatably supported by the seedling planting device 52 is inserted and connected to the lower end portion of the vertical link 43, and the seedling planting device 52 is connected so as to be able to roll around the connecting shaft. ing. A sensing member 93 that senses the elevation of the center float 55 is provided at a position surrounded by the frame of the seedling planting device 52.

  A lifting hydraulic cylinder 46 whose base is pivotally supported on the main frame 15 is connected to a leading end of a swing arm (not shown) integrally formed with the upper link 40. Is hydraulically expanded and contracted, the upper link 40 is rotated up and down, and the seedling planting device 52 is lifted and lowered with a substantially constant posture.

  The seedling planting device 52 has a six-row planting structure, a transmission case 50 that also serves as a frame, a mat seedling is placed and reciprocates to the left and right to supply seedlings one by one to the seedling outlet 51a of each row and for one horizontal row When all the seedlings are supplied to the seedling outlet 51a, the seedling mount 51 for transferring the seedlings downward by the seedling feeding belt 51b (FIG. 2), the seedling planting device 52 for planting the seedlings supplied to the seedling outlet 51a in the field, A pair of left and right drawing markers (not shown) for drawing the aircraft path in the process to the topsoil surface are provided.

  In the lower part of the seedling planting device 52, a center float 55 is provided in the center, and side floats 56, 56 are provided on the left and right sides thereof. When the aircraft is advanced with these floats 55, 56, 56 in contact with the mud surface of the field, the floats 55, 56, 56 slide while leveling the mud surface, and the seedling planting device 52 uses the seedling planting device 52 on the leveling trace. Seedlings are planted. Each float 55, 56, 56 is pivotally attached so that the front end side moves up and down according to the unevenness of the field topsoil surface, and the vertical movement of the front part of the center float 55 is the angle-of-attack sensor 93 during planting work. The planting depth of the seedling is always kept constant by switching the hydraulic valve that controls the hydraulic oil hydraulic cylinder 46 to raise and lower the seedling planting device 52 according to the detection result.

The fertilizer application device 5 feeds the granular fertilizer stored in the fertilizer hopper 60 by a fixed amount by the feeding unit 61 of the manipulating device 57 and attaches the fertilizer to the left and right sides of the floats 55, 56, 56 with the fertilizer hose 62. A fertilizer application guide (not shown) is guided and dropped into a fertilizer structure formed near the side of the seedling planting line by a grooved body 63 provided on the front side of the fertilizer guide. Air which is generated by the blower 58 driven by an electric motor is blown into the fertilization hose 62 via the air chamber 59, is a fertilizer in the fertilizer hose 62 so as to forcibly convey the fertilizer guide wind pressure Yes. The air suction port of the blower 58 is opened toward the engine 20 on the inner side of the machine body so as to suck the exhaust gas of the engine 20.

  The seedling planting device 52 is provided with a leveling rotor 27 (left and right leveling rotors 27a and 27b arranged in front of each of the left and right side floats 56a and 56b) for leveling and leveling the mud surface where the field is disturbed. In addition, the seedling mount 51 is configured to slide in the left-right direction with a support roller using a rectangular support pipe 65 having a base fixed to a transmission case 50 that also serves as a frame of the seedling planting device 52 as a rail.

  Note that the left and right auxiliary steps 28, 28 provided on both sides of the machine body are steps on which feet are placed when an operator gets on and off the machine body.

  Next, the support structure and drive configuration of the leveling rotor 27 will be described.

  The front ends of a pair of upper and lower leveling link members 6 whose rear ends are supported rotatably at the lower ends of the vertical links 43 (FIG. 1) support the rotation shafts of the pair of left and right leveling rotors 27 (27a, 27b). Two vertical links 8 are rotatably supported. Then, a pair of upper and lower leveling link members 6 are swung up and down by a gear mechanism (not shown) attached to the lower end of the support pipe 65. The gear mechanism is driven by driving rotation of an output gear (not shown) provided on a drive shaft (not shown) of the electric motor 7 provided on the support pipe 65.

  Further, the leveling rotor 27 is configured to rotate from the rear wheel gear case 18 via a drive shaft 72 and a universal joint. FIG. 3 is a plan view showing the arrangement relationship of the three leveling rotors 27 (27a, 27b, 27a). The power transmission structure to the rotor 27 is shown. FIG. 4 shows an enlarged view of a power transmission system to the rotor 27 of FIG.

  As shown in FIGS. 3 and 4, the second rotor 27 b located in front of the center float 55 is arranged in front of the first rotor 27 a located in front of the side float 56 due to the arrangement position with the floats 55 and 56. Yes. Therefore, power is transmitted from the gear in the gear case 18 of the rear wheel 11 to the first drive shaft 70a that drives the left first rotor 27a via the drive shaft 72, and further provided at the right end of the first drive shaft 70a. The first output bevel gear 74a (see FIG. 4) has a first input bevel gear 74b that meshes with the first output bevel gear 74a at the left end of the first transmission shaft 73a, and is disposed in the left transmission case 73. Power is transmitted to the first transmission shaft 73a. A second output bevel gear 75a is provided at the right end of the first transmission shaft 73a, and the second output bevel gear 75a is attached to the left end of the second drive shaft 70b to which the second rotor 27b is fixed. The power is transmitted by meshing with the input bevel gear 75b.

  Further, a third output bevel gear 76 a provided at the right end of the second drive shaft 70 b is pivotally attached, and the third output bevel gear 76 a is disposed at the left end of the second transmission shaft 73 b disposed in the right transmission case 73. The power is transmitted by meshing with a third input bevel gear 76b pivotally attached to the part. Further, the fourth output bevel gear 77a is pivotally attached to the right end portion of the second transmission shaft 73b, and the fourth output bevel gear 77a is pivotally attached to the left end portion of the first drive shaft 70a to which the right first rotor 27a is fixed. By engaging with the fourth input bevel gear 77b, power is transmitted to the entire leveling rotor 27.

  As shown in FIG. 3, the left and right first rotors 27a, 27a and the central second rotor 27b are arranged so as to be displaced from each other in the front-rear direction, and the front-rear direction between the first rotors 27a, 27a and the central second rotor 27b. A transmission shaft case 73, 73 having a pair of transmission shafts, each of which includes a first transmission shaft 73a and a second transmission shaft 73b, are disposed, and the transmission shaft cases 73, 73 are inclined forward and backward in a plan view of the body. Has been placed. It is comprised so that the space | interval of the mutual front side of a pair of transmission shaft cases 73 and 73 may become smaller than the space | interval of a rear side by plane view of an airframe.

  Further, by using the transmission shafts 73a and 73b as the power transmission system from the rear wheel transmission system to the leveling rotor 27, the configuration of the transmission device is simplified and the number of parts is reduced, thereby reducing the cost. Down is planned.

  Further, by arranging the float 55 having a narrower left and right width in a plan view from the rear end side to the seedling planting part (working part) 4 between the first transmission shaft 73a and the second transmission shaft 73b. In addition, mud pushing can be suppressed at the front end of the float 55 and the float 55 can smoothly move up and down following the farm field.

  Further, as shown in the enlarged view of the center second rotor 27b and the pair of transmission shaft cases 73, 73 shown in FIG. 4, the transmission shaft case 73 between the second rotor 27b and the first rotor 27a is imaginary in the left-right direction. By dividing by L, the matching part of the case body outer edge, which is the part into which the fixing bolt is inserted when the divided case bodies are fixed together, is projected vertically without projecting left and right, The width in the left-right direction of the case 73 can be further reduced.

  Since the rotor 27 cannot be disposed in the transmission shaft case 73 portion, the thicker the transmission shaft case 73, the wider the portion where the rotor 27 is not disposed, and the width of the rotor 27 as a whole becomes narrower. The transmission shaft case 73 can be made thinner, and by securing a long left and right width of the rotor 27, mud pushing and water pushing by the transmission shaft case 73 can be suppressed to the extent that the transmission shaft case 73 is made thinner. At the same time, since the leveling width of the rotor 27 is widened, the leveling effect can be improved.

  Conventionally, the body sinks slightly in fields deeper than the average and soft soils, so the bottom of the seedling stage 51 and the bottoms of the floats 55 and 56 are close to the field scene. At this time, if the seedling stage 51 can be moved up and down only by the initially set distance, the ascending distance of the seedling stage 51 is short with respect to the field scene, and the bottom of the seedling stage 51 and the floats 55 and 56 are in contact with the field scene. In some cases, the turning operation may not be performed smoothly due to damage caused by contact with water or soil. As a countermeasure, the control of this embodiment is performed.

  In other words, the leveling rotor 27 can be lowered to a height of about 30 cm from the bottom surface of the floats 55 and 56 by the control of the electric motor 7, and only the leveling rotor 27 is placed in the field without bringing the floats 55 and 56 into contact with the field scene. To be able to ground. This state is shown in FIGS.

  FIG. 1 shows a state in which the seedling transplanter 4 of the present embodiment is lowered on the field scene while traveling on the field, and FIG. 5 shows that the seedling transplanter 4 is about 30 cm from the field scene. The state detected by the potentiometer 94 which detects the up-and-down movement of the raised link member 3 is shown, The leveling rotor 27 is also in the state which floated on the mud surface at this time, and is turning on the said farm scene in FIG. The side view of the state which grounded the leveling rotor 27 which was sometimes raised on the field scene, and the planting part 4 floated on the field scene is shown. In the state shown in FIG. 6, when a grounding switch 84 (see FIG. 1) attached to the lower part of a transmission frame (not shown) connecting the central leveling rotor 27b and the leveling rotors 27a and 27a on both sides is grounded on the field, The leveling rotor driving electric motor 7 stops, and the leveling rotor 27 can level the field scene during turning by holding the leveling rotor 27 in that position.

  For example, when the turning angle of the steering wheel exceeds a certain value when the vehicle turns, as shown in FIG. 5, the seedling planting device 52 portion of the planting unit 4 is detected by a potentiometer 94 that is raised by about 30 cm from the field scene. ), And go straight through the field while raising the planting part 4 without planting seedlings by replenishing seedlings.

  Since the handle 34 is basically not cut except at the end of the field when the seedling is planted and straightened, the seedling planting portion 4 does not rise by the handle operation. However, when the sub-shift lever 82 is in the “seedling planting” position, the leveling rotor 27 is always lowered when the seedling planting part 4 is raised. Therefore, it is necessary to lower the leveling rotor 27 at the time of turning to level the field scene. If not, this operation must be turned on and off arbitrarily.

  A motor operation changeover switch 85 (see the control block diagram of FIG. 9) for switching the operation of the electric motor 7 is provided in the control portion. When the motor operation changeover switch 85 is “ON”, the control device 100 controls the planting portion elevating cylinder 46. When the seedling planting section 4 is raised and the seedling planting section 4 is raised, the electric motor 7 is actuated to lower the leveling rotor 27. When the motor operation changeover switch 85 is “OFF”, seedling planting is performed. Even if the part 4 is raised, the electric motor 7 does not operate, and the leveling rotor 27 is configured to rise together with the seedling planting part 4 (see FIGS. 2, 8 and 9).

  Further, when leveling the farm scene with the leveling rotor, the seedling planting device 52 may be lowered by the same distance as the distance previously raised to maintain only the leveling rotor 27 in contact with the field scene. it can.

  Furthermore, if the ascent distance of the seedling planting part 4 and the descending distance of the leveling rotors 27a, 27b are set to be equal, the leveling rotors 27a, 27b will remain in the field even if the seedling planting part 4 is lowered after the turning operation is finished. Since the contact state is maintained, the unevenness of the field scene can be leveled at the front side position of the seedling planting device 52, and the seedling can be planted at an equal depth.

  Further, when the planting part operation lever 78 is operated to move the seedling planting part 4 in the direction of raising, the seedling planting device 52 detects the set height with the potentiometer 94, and seedling planting work When it is necessary to level the farm scene by raising the position about 30 cm upward from the time position, the operation detection switch 80 for detecting the movement of the piston 46a of the hydraulic cylinder 46 shown in FIG. Actuating from the time when the piston 46a of FIG. 7a is extended to the time of contracting as shown in FIG. 7B, contact the switch pusher 46b, detect the movement of the hydraulic cylinder 46, and the leveling rotor 27 raises the seedling planting portion 4. The ground leveling rotor 27 can be left in contact with the ground by lowering it by the same distance.

  Further, a float angle sensor 93 that can detect the vertical movement of the front part of the center float 55 is provided, and when the work machine selects the seedling planting speed, the float 55, If the angle sensor 93 is used to measure how much 56 is sinking and the planting part operation lever 78 is moved to the “planting cut (seedling stand raising)” side, for example, 30 cm + the measured value by the angle sensor 93 is increased. The attaching device 52 is raised. As a result, even in deep paddy fields and soft fields, the seedling stage 51 and the floats 55 and 56 are surely raised to a height at which they do not come in contact with the turning, so that the durability of the working machine is improved compared to the prior art and damage is prevented.

  FIG. 6 is a side view showing a state in which the leveling rotor 27 that has been raised when the work machine is turning is grounded on the mud surface and the planting unit 4 is floated on the mud surface. . In the state shown in FIG. 6, when the grounding switch 84 of the leveling rotor 27 contacts the mud surface, the electric motor 7 for driving the leveling rotor stops, and the leveling rotor 27 keeps the mud surface during turning by holding the leveling rotor 27 in that position. It can be leveled.

  When the seedling planting device 52 is raised to a predetermined height, the electric motor 7 is operated and the leveling rotor 27 is lowered by the same distance as the distance the seedling planting device 52 is raised. The control that can maintain the state of being in contact with the ground is configured to operate only when the position of the auxiliary transmission lever 82 is set to the “seed planting speed”. The leveling rotor 27 does not operate accidentally when it is in the “reverse” position, and the leveling rotor 27 is automatically lowered when the seedling transplanter is moved or when moving backward, and is damaged or damaged due to contact with the ground. Can be prevented. In particular, when a mechanism for automatically retracting the cylinder 46 and raising the seedling planting portion 4 is provided when the sub-shift lever 82 is set to the “reverse” position, the above-described damage prevention effect becomes remarkable.

  A flowchart of this control is shown in FIG. 8, and a control block diagram centering on the control device 100 is shown in FIG.

  As shown in the plan view of the leveling rotor portion in FIG. 3, a pair of leveling rotors 27a, 27a are arranged on both sides of the center leveling rotor 27b in the same line on the left and right sides instead of being arranged in a straight line as shown in FIG. You may employ | adopt the structure which arrange | positioned the leveling rotors 27a and 27a arrange | positioned ahead of the side floats 56 and 56 in reverse "C" shape. At this time, power transmission between the center leveling rotor 27b and the left and right leveling rotors 27a and 27a is performed between a first drive shaft 70a of the leveling rotor 27a and a second drive shaft 70b of the leveling rotor 27b via a bevel gear (not shown). Do it.

  When the leveling rotors 27a and 27a are arranged in the left and right rows as shown in FIG. 3, when the mud is removed to the outside of the machine body by the leveling rotors 27a and 27a, in some cases, the seedlings of the adjacent strips already planted may be mud pushed. There is. Therefore, as shown in FIG. 10, if the leveling rotors 27a, 27a are arranged in a reverse “C” shape, the leveling rotors 27a, 27a may mudward the outside of the machine body and mud push the existing planted adjacent strips. Disappear.

  In the conventional configuration, the case of the left and right leveling rotor 27a is rigid, and the chain case including the drive / driven sprocket and the transmission chain is held in a cantilever manner by the support pipe 65, so the center leveling rotor 27b is lifted. The entire leveling rotor 27 is always twisted by a spring (not shown) (the leveling rotor 27 is divided into the center and the left and right, so the central rotor 27b is slightly above the left and right rotors 27a and 27a). The shape of the drive shaft is not sufficient, and the drive shaft of the left and right rotors 27a and 27a is cut off by being supported by the support pipe 65. If it is used for a long time, it may break due to metal fatigue), or the support pipe 65 and the chain Since the holding portion of the Nkesu is away, it is necessary to increase the thickness of the components, it has become a major weight.

  Therefore, as shown in FIG. 11, a frame configuration in which a stay 86 and a hub portion 87 for holding the case of the center leveling rotor 27 b are supported by a “U” -shaped tube 88 reduces the cost and durability compared to the prior art. Improvement, improvement in leveling performance and weight reduction can be achieved.

  For example, in the configuration of the conduction system of the leveling rotors 27a and 27a shown in FIG. 4, the bearing portion for power transmission at the connection portion between the hub portion of the second drive shaft 70b of the central rotor 27b and the transmission shaft of the chain case is provided. Since only the winding preventing collar 70b1 is attached, there is a small gap between the collar 70b1 and the shaft of the second drive shaft 70b, and fine scraps and the like are left and right on the first drive shafts 70a, 70a on the left and right. In some cases, the second drive shaft 70b may be wound around the center.

  Therefore, as shown in FIG. 12, when the hub portion 70b2 of the central rotor 27b attached to the second drive shaft 70b is formed into a concave shape to prevent winding, and this concave portion is integrally formed with the outer peripheral cylindrical portion of the rotor 27b. The hub portion 70b2 is not wrapped with fine sawdust or the like.

  Further, instead of the winding preventing collar 70b1 provided on the second drive shaft 70b of the central rotor 27b shown in FIG. 4, the second drive shaft 70b of the central rotor 27b and the transmission shaft case 73 are replaced as shown in FIG. When the winding prevention collar 70b3 that covers the bearing portion 73c of the transmission shaft 70b in the transmission shaft case 73 is attached to the connection portion (joint) with the transmission shaft, the gap shown in FIG. There is no. Further, since the collar 70b3 is integrated with the bearing portion 73c, the collar 70b3 also serves as a stopping member for the thrust force of the rotor 27b. Therefore, it is not necessary to provide a thrust stopping member again, and the cost can be reduced.

  Further, on both sides of the center float 55 and the side float 56, there is provided a grooving body 63 for cutting the fertilizer from the fertilizer tank 60 at the seedling planting position in the field. In this embodiment, FIG. 14B is a side view of the working machine, FIG. 14B is a side view of the groove forming body 63 and its attachment body 64, and FIG. 14C is a state in which the groove forming body 63 and its attachment body 64 are attached to the seedling planting device 52. As shown in the front view, the groove forming body 63 is attached to the tip of the groove forming body arm 64a of the attachment body 64, and the base of the groove forming body arm 64a is attached to the attachment frame 64b so that the vertical position can be adjusted. As shown in the side view of the seedling planting device 52 in FIG. The grooved body arm 64a is attached to the mounting frame 64b by inserting the grooved body arm 64a into the mounting groove 64b1 provided in the mounting frame 64b and fixing it with bolts and nuts at appropriate positions.

  The groove forming body 63 of the present embodiment has a shape in which a main body including an acute-angled tip portion is disposed in the soil, and a mounting body 64 that is a main body supporting portion for holding the main body is relatively thin. Since the groove body 63 having the above-described structure has a relatively thin attachment body 64, mud water is not drawn after planting seedlings, and mud water easily flows on the topsoil.

  Further, as shown in the side view of the seedling planting device 52 portion of the side view of the working machine in FIG. 15, the attachment body of the grooved body 63 with the base attached to the seedling planting device 52 is viewed from above the floats 55 and 56. A configuration may be adopted in which the grooved body reaches the field behind the floats 55 and 56.

  16A is a side view of the working machine, FIG. 16B is a side view of the groove forming body 63 and its mounting body 64, and FIG. 16C is a side view of the groove forming body 63 and its mounting body 64. As shown in the front view in the state of being attached to the planting device 52, the groove forming body 63 of this embodiment has a V-shaped rear view in which a lower end can be freely opened and closed inside a box-shaped housing 63a having no bottom plate and front and rear plates. In this configuration, a letter-shaped bent plate 63b is attached. Both ends of the bent plate 63b are supported on the upper surface of the housing 63a by bolts 63c, and the bolting positions are slidable so that the stopping positions by the bolts 63c can be arbitrarily changed. Therefore, the V formed by the bent plates 63b Since the shape angle can be changed, when the field is soft, mud drainage is improved and mud pushing to the sowing site is reduced compared to the conventional method.

  Further, as shown in the side view of the seedling planting device 52 part of FIG. 17, the mounting arm 64a of the groove body 63 with the base attached to the seedling planting device 52 is connected to the floats 55, 56 from above the floats 55, 56. You may make it the structure that the groove production body 63 reaches in the field behind.

  In the present invention, the seedling planting part of the rice transplanter can be configured simply, and the applicability is great.

Claims (4)

Work with a working unit provided on the rear side of the traveling vehicle body (2) via the lifting link device (3), a float (55) at the lower part of the working unit, and a fertilizer application device (5) for supplying fertilizer to the field In the machine
A mounting body is provided in the working portion in an inclined posture from above the float (55) toward the rear of the float (55), and a groove is formed in the field with a V-shaped bent plate (63b) in the rear view. A groove forming body (63) to be formed is provided,
The working machine characterized in that the attachment body is formed narrower than the width of the groove body (63) . The working machine according to claim 1, wherein the groove body (63) is configured to be capable of changing a V-shaped angle of the bent plate (63b) . A leveling rotor (27) for leveling the farm scene is provided in front of the float (55), and a leveling link member (6) for moving the leveling rotor (27) up and down and an electric motor (7) are provided on the working unit (4). Provided,
The ground leveling rotor (27) is provided with a grounding switch (84) for detecting grounding of the leveling rotor (27), and when the grounding switch (84) is in a detection state, the operation of the electric motor (7) is stopped. The working machine according to claim 1, characterized in that: The leveling rotor (27) is composed of a leveling rotator (27b) provided in front of the float (55) and sub-leveling rotators (27a) provided respectively on the left and right outer sides of the leveling rotator (27b).
A drive shaft (70b) for rotating the leveling rotator (27b) is provided, a sub-drive shaft (70a) for rotating the left and right sub-level rotators (27a) is provided, and a drive shaft (70b) and a sub-drive shaft ( 70a) is provided with a transmission shaft case (73) for accommodating the transmission shafts (73a, 73b), and a bearing portion (73c) of the drive shaft (70b) is formed in the transmission shaft case (73),
The bearing portion (73c) of the drive shaft (70b) is covered with a central hub portion (70b2) or a collar (70b3) formed on the leveling rotator (27b), and the transmission shaft case (73) and left and right A U-shaped tube (88) having an opening at the bottom of an outer hub portion (87) provided between the auxiliary leveling rotator (27a) and a stay (86) for holding the left and right leveling rotators (27a). A support pipe (65) for suspending the leveling rotator (27b) and the left and right auxiliary leveling rotators (27a) is connected to a U-shaped tube (88). 3. The working machine according to 3.

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