JP2008154535A - Seedling transplanter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate maintenance, to lower the cost, to reduce sliding resistance and abrasion, in a sliding member for moving a seedling stand in the transverse direction. <P>SOLUTION: In a seedling transplanter having a constitution with the seedling stand (80) being moved in the transverse direction relative to a machine body, seedlings are fed to a fixed seedling taking out position, one by one, for one stock portion; the seedlings supplied to the seedling taking out position are taken out and transplanted in a field; and a sliding member (124), made of a polyethylene-based resin, is disposed in between the machine body and the seedling stand (80). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a seedling transplanter.

In a riding type rice transplanter, which is an example of a seedling transplanter, the seedling platform is moved laterally with respect to the aircraft to supply seedlings one by one to a predetermined seedling picking position, and the seedling picking device supplies the seedlings. It is known that a seedling supplied to a position is taken out and transplanted to a farm field, and a sliding member is provided between a horizontal frame fixed to the machine body and a seedling mount. In this riding type rice transplanter, the sliding member is fixedly attached to a seedling stage, and lubricating oil is supplied to the sliding surface of the sliding member that is a contact surface with the horizontal frame to slide the sliding member. The planting accuracy is improved by reducing the dynamic resistance and reducing the wear of the sliding member, and smoothly moving the seedling table laterally. (See Patent Document 1).
JP-A-7-289019

  According to the above background art, the maintenance is required to supply the lubricating oil to the sliding surface of the sliding member, and the cost is increased because the lubricating oil is required as appropriate. Further, since viscous lubricating oil such as grease or oil is supplied to the sliding surface of the sliding member, soil and water in the field are likely to adhere to the sliding surface, and the sliding resistance is increased or the sliding is increased. There is a risk of urging the moving member.

  Therefore, an object of the present invention is to facilitate maintenance, reduce costs, reduce sliding resistance, and reduce wear in a sliding member for moving a seedling platform in a lateral direction.

In order to solve the above problems, the present invention has taken the following technical means.
That is, the invention according to claim 1 moves the seedling mount (80) laterally with respect to the machine body to supply seedlings one by one to a predetermined seedling extraction position (78), and the seedling extraction position ( 78) In the seedling transplanter configured to take out the seedling supplied to the field and transplant it to the field, sliding members (122, 124) made of polyethylene resin are provided between the machine body and the seedling mount (80). An established seedling transplanter was used.

  Therefore, in the seedling transplanting machine according to claim 1, in the state where the seedling is mounted on the seedling mounting base (80), the seedling mounting base (80) is moved in the lateral direction with respect to the machine body so that the predetermined amount of seedling is transferred. One stock is supplied to the seedling extraction position (78), and the seedling supplied to the seedling extraction position (78) is taken out and transplanted to the field. The sliding members (122, 124) for moving the seedling mount (80) in the lateral direction are made of polyethylene resin, so that sliding resistance can be achieved without supplying lubricating oil to the sliding surface. Small and highly wear resistant.

  In the invention according to claim 2, the sliding surface of the sliding member (124) is provided with a discharge groove (124c) for urging discharge of foreign matters such as mud and water, and the discharge groove (124c) 80) The seedling transplanter according to claim 1, comprising a plurality of oblique grooves (124f) formed obliquely with respect to the moving direction of 80).

  Therefore, in addition to the operation of the seedling transplanting machine according to claim 1, the seedling transplanting machine according to claim 2 scrapes foreign matter such as mud and water that has entered the sliding portion through a plurality of oblique grooves (124f). Then, it can be scraped out and discharged efficiently.

  According to the seedling transplanting machine according to the first aspect, since the sliding resistance of the sliding member is small, the seedling mounting table (80) can be moved smoothly and the planting accuracy can be improved. Further, since the sliding members (122, 124) have high wear resistance, there is little wear due to use, replacement is unnecessary or the frequency of replacement is low, maintenance is improved, and cost can be reduced. Furthermore, since it is not necessary to supply lubricating oil to the sliding surface, it becomes difficult for soil and water in the field to adhere to the sliding surface by not supplying lubricating oil, and the sliding resistance is increased by the adhered soil and water. In addition, it is possible to prevent the sliding member from being worn, and it is not necessary to supply lubricating oil, thereby improving maintenance and reducing costs.

  Moreover, according to the seedling transplanting machine according to claim 2, in addition to the effect of the invention of the seedling transplanting machine according to claim 1, foreign matter such as mud and water entering the sliding portion can be efficiently discharged. As a result, wear of the sliding member (124) can be prevented.

One embodiment of the present invention will be described below.
FIG. 1 and FIG. 2 show a riding type rice transplanter 1 with a fertilizer application. This riding type rice transplanter 1 has a seedling planting portion on the rear side of a traveling vehicle body 2 via a lifting link device 3. 4 is mounted so as to be movable up and down, and a main body portion of the fertilizer applicator 5 is provided on the upper rear side of the traveling vehicle body 2.

  The traveling vehicle body 2 is a four-wheel drive vehicle including a pair of left and right front wheels 6 and rear wheels 7 which are drive wheels, and a transmission case 8 is disposed at the front of the fuselage. A front wheel final case 9 is provided, and a front wheel 6 is attached to a front wheel axle that protrudes outward from a changeable front wheel support portion 9a of the front wheel final case 9. Further, the front end portion of the main frame 10 is fixed to the rear portion of the transmission case 8, and the rear wheel gear case 12 is supported by a rear wheel rolling shaft 11 provided horizontally at the front and rear left and right center portions of the main frame 10. The rear wheel 7 is attached to a rear wheel axle that is supported in a freely rolling manner and projects outward from the rear wheel gear case 12.

  The engine 13 serving as a prime mover is mounted on the main frame 10, and the hydraulic power is continuously moved forward and backward as a transmission device in which the rotational power of the engine 13 can be switched between forward and reverse via the first belt transmission device 14. Input to the transmission (HST) 15. The output from the forward / reverse continuously variable transmission (HST) 15 is transmitted to the transmission case 8 via the second belt transmission 16. The rotational power transmitted to the mission case 8 is branched and transmitted to the traveling transmission path and the planting transmission path by the transmission branching portion 8a in the case 8, and separated into the traveling power and the externally extracted power. It is. A part of the traveling power is transmitted to the front wheel final case 9 to drive the front wheel 6, and the rest is transmitted to the rear wheel gear case 12 to drive the rear wheel 7. Further, the external take-out power is transmitted to the planting clutch case 18 provided at the rear part of the traveling vehicle body 2 through the take-out transmission shaft 17, and then transmitted to the seedling planting unit 4 through the planting transmission shaft 19, and fertilizer is applied. It is transmitted to the fertilizer application 5 by a transmission mechanism (not shown).

The upper part of the engine 13 is covered with an engine cover 20, and a seat 21 is installed thereon. A bonnet 22 incorporating various operation mechanisms is provided in front of the seat 21, and a handle 23 for steering the front wheel 6 is provided above the bonnet 22. A forward / reverse transmission lever 24 for operating the forward / reverse continuously variable transmission (HST) 15 is provided on the right side of the seat 21. Further, in the vicinity of the handle 23, there is provided a planting raising / lowering operation lever 25 for performing the raising / lowering operation of the seedling planting unit 4 and the on / off operation. The engine cover 20 and the bonnet 22 have horizontal floor steps 26 on the left and right sides of the lower end. In addition, on the left and right sides of the front part of the traveling vehicle body 2, a spare seedling stage 27 on which supplementary seedlings are placed is provided.

  The lift link device 3 includes a single upper link 70 and a pair of left and right lower links 71. The links 70 and 71 are pivotally attached to a rear-view portal-shaped link base frame 72 erected on the rear end of the main frame 10 on the base side, and a vertical link 73 is connected to the tip side. . And the connecting shaft 74 rotatably supported by the seedling planting part 4 is inserted and connected to the lower end part of the vertical link 73, and the seedling planting part 4 is connected so that rolling is possible centering | focusing on the connecting shaft 74. An elevating hydraulic cylinder 76 is provided between a support member fixed to the main frame 10 and a distal end portion of a swing arm 75 integrally formed with the upper link 70, and the upper link 70 is expanded and contracted by hydraulic pressure. Rotates up and down, and the seedling planting part 4 moves up and down while maintaining a substantially constant posture.

  The seedling planting section 4 has an eight-row planting structure, a transmission case 77 that also serves as a frame, a mat seedling, and a left and right reciprocating motion to supply seedlings to the seedling outlet 78 of each row one by one and for one horizontal row When all the seedlings are supplied to the seedling outlet 78, the seedling mount 80 for transferring the seedlings downward by the seedling feeding belt 79, and the seedling planting device for planting the seedlings supplied to the seedling outlet 78 in the field with the seedling planting tool 37a. 37 etc.

  The seedling mounting table 80 is supported on the back side of the seedling mounting surface so as to be movable in the left-right direction along a horizontal frame 81 provided in the left-right direction at the bottom of the back surface side. The horizontal frame 81 is provided with eight seedling outlets 78. A laterally moving rod 82 that protrudes from the left and right sides of the transmission case 77 and reciprocates in the lateral direction by the power in the transmission case 77 is provided, and a connecting member 83 and a seedling stand fixed to both ends of the laterally moving rod 82 80, and the horizontal movement rod 82 reciprocates left and right so that the seedling stage 80 reciprocates left and right. In the transmission case 77, a lead cam and a lead cam shaft that is screwed to the lead cam are provided. Accordingly, the lateral movement rod 82 is fixed to the lead cam in the transmission case 77 and reciprocates left and right by the drive rotation of the lead cam shaft.

  Left and right moving guide members 120 and 121 that are long in the left and right direction are respectively fixedly provided on the upper and lower sides of the rear surface side of the seedling stage 80. The upper left / right moving guide member 120 is formed in a gate-shaped cross-sectional shape with the lower side cut out in a side view, and is engaged with a rotatable support roller 122 supported from the lower side. A plurality (four) of the support rollers 122 are provided at appropriate positions (four locations) along the upper left / right moving guide member 120, and the upper portion of the seedling support frame 123 fixed to the upper side of the transmission case 77. Is attached. The lower left / right moving guide member 121 includes a gate-shaped cross-sectional portion 121a with a lower side cut out in a side view, and a square-shaped cross-sectional portion 121b immediately above the gate-shaped cross-sectional shape portion 121a. 124 is fixed. The slider 124 has a structure in which a protrusion 124 a provided on the upper portion is inserted into an attachment hole provided on the lower left and right moving guide member 121 and is fixed, and the slider 124 is appropriately arranged along the lower left and right moving guide member 121. A plurality (four) are provided at positions (four places), and engage with a rail portion 81a provided on the upper portion of the horizontal frame 81 from above. Therefore, the seedling stage 80 is supported by the support roller 122 and the horizontal frame 81 so as to be movable in the left-right direction. Further, the support roller 122 and the slider 124 are sliding members made of polyethylene resin (ultra high molecular weight polyethylene).

  The slider 124 has a gate-shaped, that is, a U-shaped cross-sectional shape with a lower side cut out in a side view, and has a U-shaped sliding surface formed by three side surfaces. The main sliding surface 124b having the largest area among the three planes is formed at the center of the U-shaped sliding surface in side view, and the normal direction of the main sliding surface 124b is the most vertical among the three planes. Near the direction, the contact pressure of the contact surface of the main sliding surface 124b is the highest. In addition, a discharge groove 124c that facilitates discharge of foreign matters such as mud and water is provided on the sliding surface of the slider 124. The discharge groove 124c communicates with the main groove 124e extending left and right at the lower corner portion 124d of the U-shaped sliding surface when viewed from the side and the main groove 124e at the left and right center of the slider 124, and goes to the left and right sides. An oblique groove 124f formed obliquely on the main sliding surface 124b so as to be separated from the main groove 124e. The left and right ends of the oblique groove 124f reach the corner 124g on the opposite side (upper side) from the corner 124d where the main groove 124e is formed. Accordingly, when the slider 124 moves left and right, mud or water that has entered between the main sliding surface 124b and the rail portion 81a of the horizontal frame 81 is scraped and scraped out by the slant groove 124f toward the main groove 124e, and the main groove 124e. The slider 124 can be efficiently discharged to the left and right. Accordingly, wear of the slider 124 or the rail portion 81a of the horizontal frame 81 can be prevented, and drainage is improved, so that water can be supplied to the sliding surface for cleaning.

  Further, a liquid supply path 125 is provided from the upper part of the seedling stage 80 to the upper corner 124g of the sliding surface 124b of the slider 124. Water is supplied to the sliding surface 124b of the slider 124 through the liquid supply path 125. The sliding portion can be lubricated with water. This eliminates the need for lubricating oil, so that the lubricating oil does not flow out to the field and the environment is not contaminated by the lubricating oil. Further, foreign matters such as soil adhering to the slider 124 and the rail portion 81a can be washed away by water, so that slidability can be improved and wear of the slider 124 and the rail portion 81a can be prevented. In order to configure the liquid supply path 125, holes are formed in the lower left and right moving guide member 121 and the slider 124. In addition, since the liquid supply path 125 is configured to face the uppermost position of the sliding surface of the slider 124, water serving as a lubricant can be spread over the entire U-shaped sliding surface. Will improve. The supply of the lubricant to the sliding portion may be performed from a liquid tank storing the lubricant via an electric discharge pump.

  The seedling feeding belt 79 is stretched around a driving roller 84 and a driven roller 85. The drive roller 84 is provided so as to rotate integrally with the seedling feed drive shaft 86 in the left-right direction. The seedling feeding drive shaft 86 is configured to transmit rotation only in the direction in which the seedling feeding belt 79 feeds the seedling by the ratchet mechanism 87.

  The drive mechanism of the seedling feeding belt 79 has the following configuration. That is, drive side arms 88 that project from the left and right sides of the transmission case 77 to rotate are provided. A relay shaft 89 in the left-right direction is provided above the seedling feed drive shaft 86, and a driven arm 90 is attached thereto. The relay shaft 89 and the seedling feed drive shaft 86 are connected in transmission by a link mechanism 94 including arms 91 and 92 and a link 93.

When the seedling stage 80 reaches the end of the left-right movement stroke, the driving side arm 88 comes into contact with the driven side arm 90 from the lower side to rotate the relay shaft 89 by a predetermined angle. The rotation is transmitted to the seedling feed drive shaft 86 via the link mechanism 94 and the ratchet mechanism 87. Thereby, the seedling feeding belt 79 operates by a predetermined amount. In addition, two driven arms 90 are provided on the same relay shaft 89 on the left and right sides with respect to one driving arm 88 so that the seedling mounting table 80 can transmit seedling feeding power at both ends of the right and left movement. It has been. When the driving side arm 88 moves away from the driven side arm 90, the relay shaft 89 and the driven side arm 90 return to the positions before driving by the tension of the spring 96 locked to the swing fulcrum shaft 95 described later. The relay shaft 89 and the driven arm 90 are configured to return to a position where the stopper 97 provided at the end of the relay shaft 89 comes into contact with the restriction member 98 on the seedling stage 80 main body side by the tension of the spring 96. Yes.

  By the way, the seedling feed drive shaft 86 is divided into a left four-line portion and a right four-line portion. The relay shaft 89 is also divided into a left relay shaft and a right relay shaft. In correspondence with the left and right seedling feed drive shafts 86 and the relay shafts 89, a drive side arm 88, a link mechanism 94, and two left and right driven side arms 90 are provided on the left and right sides, respectively.

  In the driven arm 90, a base portion 90a near the center of rotation and a rotating tip end portion 90b with which the driving arm 88 abuts are configured separately, and both portions 90a and 90b are provided in the middle of the arm 90. Are connected by a oscillating fulcrum shaft 95 in the direction. The base portion 90 a is configured to rotate integrally with the relay shaft 89, and the rotating tip side portion 90 b is provided with a swing fulcrum shaft 95 by a torque spring (not shown) provided on the swing fulcrum shaft 95. It is biased in a direction to rotate upward (opposite to the side in contact with the transmission to the seedling feeding belt 79), and normally contacts the relay shaft 89 so as not to rotate further upward. Therefore, at the time of normal seedling feeding transmission in which the driving side arm 88 contacts the driven side arm 90 from below, the base portion 90a and the rotating tip side portion 90b of the driven side arm 90 are integrally formed around the relay shaft 89. Rotate upward. On the other hand, when the driving side arm 88 is reversed and comes into contact with the driven side arm 90 from the upper side, only the rotating tip side portion 90b comes into contact with the base portion 90a on the lower side (in transmission to the seedling feeding belt 79). To the side) against the torque spring.

  In the lower part of the seedling planting section 4, there are a center float 100 for leveling the seedling planting positions for the central two strips, a side float 101 for leveling the seedling planting positions for the two left and right sides, and the center float 100 and the side A mid float 102 is provided to level the seedling planting position for the remaining one line with the float 101. When the aircraft is advanced with these floats 100, 101, 102 in contact with the mud surface of the field, the floats 100, 101, 102 slide while leveling the mud surface, and a seedling planting device 37 is attached to the ground level. Seedlings are planted. Each float 100, 101, 102 is rotatably 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 100 is detected as a vertical movement detection mechanism during planting work. The planting depth of the seedling is always maintained constant by switching the hydraulic valve (not shown) that controls the lifting hydraulic cylinder 76 according to the detection result to raise and lower the seedling planting unit 4. To do.

The fertilizer application device 5 feeds the fertilizer (powder granule) stored in the fertilizer storage tank (powder granule storage tank) 110 by a fertilizer feed part (powder granule feed part) 63 of each strip by a fixed amount, and the fertilizer. Is guided to the fertilizer application guide 112 attached to the floats 100, 101, 102 by a fertilizer transfer hose (powder transfer hose) 111, and is placed in the vicinity of the side portion of the seedling planting line by the grooved body 113 provided on the front side of the fertilizer application guide 112. It discharges in the fertilization groove formed. The pressure air generated by the blower 115 driven by the motor 114 is blown into the fertilizer transfer hose 111 via the air chamber 116 which is long in the left-right direction, and the fertilizer in the fertilizer transfer hose 111 is discharged from the seedling planting part 4 side. It is forcibly transferred to the outlet (fertilization guide 112). The fertilizer supplied in the fertilizer groove is covered with a cover plate 117 attached to the floats 100, 101, 102 behind the fertilizer guide 112 and the groove body 113.

  Since it is desirable that the fertilization guide 112 and the grooved body 113 of each strip have the same positional relationship (distance) with the corresponding seedling planting device 37 and uniform fertilization of each strip, the same in the front-rear direction. It is arranged at the position (the same position in the side view of the fuselage). Similarly, it is desirable to make the distance (distance) uniform with respect to the fertilization guide 112, the groove body 113, and the seedling planting device 37 corresponding to the covering plate 117 of each strip. This is because if the cover plate is positioned too close to the fertilizer guide, mud pushed by the cover plate may be supplied into the fertilizer guide and the fertilizer guide may be clogged. If it is positioned too far from the fertilizer application guide, the fertilizer will rise slightly from the bottom of the fertilizer ditch due to water in the field before covering with the cover plate, resulting in less soil cover and appropriate fertilization effect. It is because there is a risk of disappearing.

  As described above, the riding-type rice transplanter 1 supplies the seedlings by one stock to the seedling outlet 78 that moves the seedling stage 80 in the lateral direction (left and right direction) with respect to the machine body and becomes a predetermined seedling extraction position. The seedling supplied to the seedling outlet 78 is taken out by the seedling planting device 37 and transplanted to the field, and a sliding member formed of polyethylene resin between the machine body and the seedling mount 80 is provided. A support roller 122 and a slider 124 are provided.

  Therefore, in this riding type rice transplanter 1, with the seedlings mounted on the seedling stage 80, the seedling stage 80 is moved in the left-right direction with respect to the machine body so that the seedlings are fed to the seedling outlet 78. The seedlings are supplied one by one and the seedlings supplied to the seedling outlet 78 by the seedling planting device 37 are taken out and transplanted to the field. Since the support roller 122 and the slider 124 for moving the seedling stage 80 in the lateral direction are made of polyethylene resin, the sliding resistance is small even without supplying lubricating oil to the sliding surface. Abrasion is high.

  Therefore, since the sliding resistance between the support roller 122 and the slider 124 is small, the seedling mounting table 80 can be smoothly moved laterally, and the seedlings for one stock to be taken out by the seedling planting device 37 are sent to the seedling outlet 78. It can be supplied properly and planting accuracy can be improved. In addition, since the support roller 122 and the slider 124 have high wear resistance, wear due to use is low, replacement is unnecessary or the frequency of replacement is low, maintenance is improved, and cost can be reduced. Furthermore, since it is not necessary to supply lubricating oil to the sliding surfaces of the support roller 122 and the slider 124, it becomes difficult for soil and water in the field to adhere to the sliding surfaces by not supplying lubricating oil. Thus, it is possible to prevent the sliding resistance from being increased or to promote the wear of the sliding member, and it becomes unnecessary to supply the lubricating oil, so that the maintenance performance can be improved and the cost can be reduced. Conventionally, an oil supply device for supplying lubricating oil to the sliding surface of the slider is provided, and the cost of this oil supply device is about 600 yen / unit. However, if the oil supply device is eliminated, the cost is reduced accordingly. Moreover, since the lubricating oil is not required as described above, the lubricating oil may overflow from the sliding surface, or the lubricating oil remaining in the lubricating oil supply pipe may be discharged and the lubricating oil may flow out to the field. Therefore, it is possible to prevent the field from being contaminated and to prevent the seedling from being adversely affected.

  In addition, the conventional sliding member is added with molybdenum disulfide, which is a harmful substance, in order to improve the sliding characteristics. However, since the sliding member of the present invention has high sliding characteristics, molybdenum disulfide is added. The environmental load can be reduced.

  Conventionally, a slight gap (space) is provided between the sliding surface of the slider and the rail portion 81a of the horizontal frame 81 to collect lubricating oil. Although there is a risk of increasing the sliding resistance and promoting the wear of the sliding member, the slider 124 is formed of a polyethylene resin having a low sliding resistance, so that the sliding surface of the slider 124 is Since the gap between the rail portion 81a of the frame 81 can be eliminated or reduced, foreign matter such as soil and water can be prevented from entering between the sliding surface of the slider 124 and the rail portion 81a of the horizontal frame 81. be able to.

In the above description, both the support roller 122 and the slider 124 are formed of polyethylene resin, but only one of them may be formed of polyethylene resin.
Next, the reason why polyethylene resin is excellent as a sliding member will be described.

  When performing sliding tests on sliding members, three types of sliders are used: the conventional PA6 (6 nylon), POM (Duracon) with excellent sliding wear, and ultra-high molecular weight polyethylene (UHMW-PE) with excellent rough wear. A piece was prepared. In addition, a stainless steel test piece of SUS304 was prepared as a rail portion of the horizontal frame 81 to be a sliding counterpart material of the slider. The surface pressure of the sliding surface was set to 0.7 MPa, and the sliding speed was set to 3 m / min. As sliding conditions, muddy water was dropped with grease applied to the sliding surface, and the coefficient of dynamic friction was measured. With the conventional product PA6 (6 nylon), the dynamic friction coefficient increased as the number of sliding operations increased, and the dynamic friction coefficient converged around 0.5. In POM, the dynamic friction coefficient converged around 0.2. In ultra high molecular weight polyethylene (UHMW-PE), it converged around 0.1.

  Next, there are three types of sliding conditions: no lubrication conditions, muddy water dripping conditions assuming a state where muddy water is applied due to running out of lubricating oil, and lubricating muddy water dripping conditions in which muddy water is dripped with grease applied to the sliding surface. Then, the specific wear amount of the slider was measured. Under non-lubricating conditions, PA6 (6 nylon) is 0.00003970 (cubic millimeter) / N · m, POM is 0.00001520 (cubic millimeter) / N · m, and ultrahigh molecular weight polyethylene (UHMW-PE) is 0.00000130. (Cubic millimeter) / N · m. Under muddy water dropping conditions, PA6 (6 nylon) is 0.00003023 (cubic millimeter) / N · m, POM is 0.00017377 (cubic millimeter) / N · m, and ultrahigh molecular weight polyethylene (UHMW-PE) is 0.00001130. (Cubic millimeter) / N · m. Lubricating muddy water dripping conditions are 0.00006688 (cubic millimeter) / N · m for PA6 (6 nylon), 0.00024406 (cubic millimeter) / N · m for POM, and 0.000 for ultra high molecular weight polyethylene (UHMW-PE). 00003084 (cubic millimeter) / N · m. Therefore, it has been found that POM is not suitable as a sliding member of a seedling transplanter because the specific wear amount increases in a state where muddy water is dropped. Also, ultra high molecular weight polyethylene (UHMW-PE) has a small specific wear amount under any sliding condition and a small dynamic friction coefficient, so it has wear resistance and sliding resistance as a sliding member of a seedling transplanter. It became clear that it was small.

Further, the wear depth of a SUS304 stainless steel test piece, which is a sliding material of the slider, was measured. When the slider was PA6 (6 nylon), it was 11 μm under the non-lubricating condition, 13 μm under the muddy water dropping condition, and 17 μm under the lubricating muddy water dropping condition. On the other hand, when the slider was made of ultra high molecular weight polyethylene (UHMW-PE), it became 10 μm under the non-lubricating condition, 9 μm under the muddy water dropping condition, and 10 μm under the lubricating muddy water dropping condition. Therefore, it has been found that when the slider is made of ultra high molecular weight polyethylene (UHMW-PE), the amount of wear of the rail portion of the lateral frame 81 of the sliding partner material is also reduced.

  Therefore, the slider is set to ultra-high molecular weight polyethylene (UHMW-PE), and the sliding condition is set to two types, that is, the non-lubricating condition and the lubricating condition in which grease is applied to the sliding surface, and the wear amount and wear speed are set. Was measured. Under unlubricated conditions, the wear amount was 0.01 to 0.02 g, and the wear rate was 0.11 to 0.22 mg / hr. Under lubricating conditions, the wear amount was 0.05 to 0.16 g, and the wear rate was 0.55 to 1.75 mg / hr. Accordingly, it has been found that the amount of wear and the wear rate are both smaller when there is no lubrication. Further, instead of setting the surface pressure of the sliding surface, the load (sliding) of the right and left movement of the seedling stage 80 between the full state where the seedling stage 80 is fully loaded and the empty state where the seedling is not placed on the seedling stage 80 is determined. Dynamic resistance) was measured. Under the non-lubricated condition, the weight was 20.4 kg in the full state and 10.0 kg in the empty state. Under the lubrication conditions, the load was 18.5 kg in the full state and 9.2 kg in the empty state. Therefore, it was found that there is no significant influence on the sliding resistance depending on the presence or absence of lubrication. Therefore, when ultra high molecular weight polyethylene (UHMW-PE) is used as a slider (sliding member), it became clear that it is not necessary to supply lubricating oil to the sliding surface.

  The material price of ultra high molecular weight polyethylene (UHMW-PE) is almost the same as the material price of conventional PA6 (6 nylon), so the cost can be increased even if ultra high molecular weight polyethylene (UHMW-PE) is used as a sliding member. Don't be.

  By the way, as shown in FIG. 8, sealing material 126 formed of rubber or the like can be fitted to both ends of the slider 124 in the left-right direction so that mud and water do not enter the sliding surface of the slider 124. The sealing material 126 is located between the slider 124 and the rail portion 81a of the horizontal frame 81, and can prevent the slider 124 or the rail portion 81a of the horizontal frame 81 from being worn. The sealing material 126 may be an adsorbing material such as a sponge that adsorbs mud or water.

  Further, as shown in FIG. 9, convex portions 124 h are provided on the left and right sides of the upper portion of the slider 124, and the convex portions 124 h come into contact with the lower left and right moving guide member 121, so that both left and right end portions of the slider 124 are lowered. Can be configured to bend to the side. Thereby, the contact pressure to the rail portion 81a of the horizontal frame 81 at the left and right ends of the slider 124 is increased, and mud and water can be prevented from entering the sliding surface of the slider 124. It should be noted that the upper and lower thicknesses of the left and right ends of the slider 124 may be made larger than the center of the left and right to increase the contact pressure to the rail portion 81a of the horizontal frame 81 at the left and right ends of the slider 124. Further, a lubricating oil supply port 123 is provided at a position on the upper corner 124g of the U-shaped sliding surface of the slider 124 and facing the left and right center of the main sliding surface 124b, and the upper corner 124g. The main sliding surface 124b is provided with an oblique lubricating groove extending obliquely outward in the left-right direction as it goes from the lower corner portion 124d to the lower corner portion 124d. Note that a plurality (two) of the oblique lubrication grooves 124f are provided on the left and right sides of the supply port 123, respectively. As a result, the lubricating oil from the supply port 123 can be spread over substantially the entire area of the main sliding surface 124b, and the lubricity is improved and the lubricating oil flows toward the left and right outer sides. Lubricating oil can be smoothly discharged to the outside of the slider 124, and wear of the slider 124 can be prevented while maintaining good sliding characteristics of the slider 124. If the angles of the plurality of lubricating grooves 124f on the left and right sides of the supply port 123 are made different, the lubricating action can be further promoted.

  As shown in FIG. 10, a supply port 123 for supplying lubricating oil such as grease is provided at the center of the main sliding surface 124b of the slider 124, and lubricating grooves 124i extending from the supply port to the four corners of the main sliding surface are provided. It can be provided on the main sliding surface 124b. As a result, the lubricating oil can be spread over substantially the entire area of the main sliding surface 124b to improve the lubricity, and since the lubricating oil flows toward the left and right outer sides, the old lubricating oil mixed with mud and water can be smoothly removed. It can be discharged to the outside of the slider 124, and wear of the slider 124 can be prevented while maintaining good sliding characteristics of the slider 124.

  Further, as shown in FIG. 11, in the lower left and right moving guide member 121, a liquid absorbing material 127 such as a sponge is provided at positions corresponding to both left and right ends of the slider 124, and the lower end of the liquid absorbing material 127 is a horizontal frame. The liquid inlet 128 is provided on the upper side of the liquid absorbing material 127 and can supply water to the liquid absorbing material 127, and the liquid absorbing material is provided on the sliding surface of the rail portion 81 a of the horizontal frame 81. The water can be supplied from the material 127 so that the sliding portion can be lubricated with water. This eliminates the need for lubricating oil, so that the lubricating oil does not flow out to the field and the environment is not contaminated by the lubricating oil. Further, foreign matters such as soil adhering to the slider 124 and the rail portion 81a can be washed away by water, so that slidability can be improved and wear of the slider 124 and the rail portion 81a can be prevented. In this configuration, lubricating oil can be supplied instead of water, and the sliding portion can be lubricated with lubricating oil.

  Also, as shown in FIG. 12, a wear sensor 129 having an electrode is embedded in the slider 124, and when the sliding surface of the slider 124 is worn by a predetermined amount or more by the wear sensor 129, a signal is input to the control unit 130. An alarm such as turning on the notification lamp of the monitor may be issued by the output from the. Thereby, it is easily understood that the slider 124 needs to be replaced, and the maintainability is improved.

  Further, as shown in FIG. 13, a slit hole 124j extending in the front-rear direction is provided at the left and right center of the main sliding surface 124b of the slider 124, and foreign matter such as mud that has entered the sliding portion from the slit hole 124j is discharged to the outside. It can be configured. At this time, if the inclined surfaces 124k are formed on both sides of the slit hole 124j, the discharge of foreign matter is promoted.

  Further, as shown in FIG. 14, a liquid tank 131 for storing cleaning water is provided, and an electric discharge pump 132 for discharging the water in the liquid tank 131 is provided in the liquid supply path 125 and mounted on the aircraft. When a cleaning operation tool (cleaning button) 134 that can be operated by an operator is provided and the operation of the cleaning operation tool 134 is input to the control unit 130, the control unit 130 outputs the discharge pump 132 to the discharge pump 132. 132 is driven only for a predetermined time to supply cleaning water to the sliding surface of the slider 124, and the planting clutch in the planting clutch case 18 is operated by an actuator to be transmitted for a predetermined time in synchronization with the discharge pump 132. It can be set as the structure which drives the seedling planting part 4 in a state, and by extension the seedling mounting stand 80 moves to the left and right. Thereby, the sliding part which consists of the slider 124 and the rail part 81a can be wash | cleaned easily, and maintainability improves. Since a plurality of (four) sliders 124 are provided, the liquid supply path corresponding to each slider 124 is branched on the lower side of the discharge pump 132, and a plurality (four) are driven by driving the common discharge pump 132. The slider 124 may be supplied with water at the same time. In addition, the unit clutch which can turn on and off the drive of some seedling planting devices 37 by turning on and off the drive of the eight seedling planting devices 37 every two rows, and each unit clutch lever which operates the unit clutch 135 and each unit clutch lever sensor 135a for detecting the operation position of the unit clutch lever 135 are provided, and the unit clutch lever sensor 135a inputs to the control unit 130 that all unit clutches are turned off. The above-described cleaning operation is performed only when it is performed. Thus, by operating the cleaning operation tool (cleaning button) 134 by mistake during normal planting work, it is possible to prevent the cleaning operation from being performed and adversely affecting the planting work.

  A load sensor 136 for detecting the driving torque of the planting transmission shaft 19 that is transmitted to the seedling planting unit 4 is provided, and the load sensor 136 causes the driving load of the seedling planting unit 4 and the lateral movement resistance of the seedling mounting table 80 to be increased. When it is detected that the size is large, the above-described cleaning operation is automatically performed. Thereby, smoothing of the right-and-left movement of the seedling mounting stand 80 can be achieved, so that planting accuracy is improved and maintainability is improved. Further, in the lower left and right moving guide member 121, a water detection sensor 137 for detecting water on the sliding surface is provided at a position facing the sliding surface of the slider 124, and the water detection sensor 137 is provided on the sliding surface. When it is detected that there is no water, the above-described cleaning operation is automatically performed by the control unit 130. The water detection sensor 137 is configured to detect the presence or absence of water by transmitting an electromagnetic wave having a wavelength of 1.4 μm, which is a water absorption band, and receiving the reflected wave.

  The liquid supply path 125 shown in FIG. 15 is bent upward from the rear side of the seedling stage 80 through the lower side of the horizontal frame 81 and reaches the upper surface of the rail portion 81a of the horizontal frame 81, that is, the sliding surface. . Note that a hole is formed in the rail portion 81 a of the horizontal frame 81 in order to configure the liquid supply path 125. Thereby, lubricating oil or water can be supplied from the back of the seedling mounting stand 80, and maintainability improves. Further, in the slider 124, a pressure relief hole 124l communicating with the outside from the main sliding surface 124b is provided at a position where it can face the liquid supply path 125 by the lateral movement of the seedling stage 80. The pressure of fluid from the liquid supply path 125 can be relieved to some extent by 124l. The thickness (diameter) of the pressure release hole 124l is extremely smaller than the thickness (diameter) of the liquid supply path 125.

In addition, if pressurized air is supplied to the liquid supply path 125, a sliding part can be air-washed and the discharge effect | action of a foreign material can be increased.
In addition, although embodiment of this invention described the riding type rice transplanter 1, this invention is not limited to a riding type rice transplanter.

Side view of rice transplanter Top view of rice transplanter Plan view showing the main part of the traveling vehicle body An expanded plan view showing the seedling planting section in an easy-to-understand manner Cross-sectional side view showing the bottom of the seedling stand Cross-sectional side view showing the peripheral structure of the slider The figure which shows a slider (a: side view, b: bottom view, c: S1-S1 sectional view of b) Figures showing different sliders (a: side view, b: bottom view) The figure which shows a different slider (a: front view, b: bottom view, c: AA sectional view of b, d: side view) Bottom view showing different sliders Rear view showing liquid absorbing material Rear view showing slider with wear sensor Perspective view showing different sliders Block Diagram Cross-sectional side view showing different liquid supply paths and their surroundings

Explanation of symbols

  1: Riding type rice transplanter, 78: Seedling outlet (seedling extraction position), 80: Seedling stand, 122: Support roller, 124: Slider

Claims (2)

The seedling stage (80) is moved laterally with respect to the machine body to supply seedlings one by one to a predetermined seedling extraction position (78), and the seedlings supplied to the seedling extraction position (78) are taken out. In the seedling transplanting machine configured to be transplanted in a farm field, a seedling transplanting machine in which sliding members (122, 124) formed of a polyethylene resin are provided between the machine body and the seedling mount (80). The sliding surface of the sliding member (124) is provided with a discharge groove (124c) that promotes the discharge of foreign matters such as mud and water, and the discharge groove (124c) is inclined with respect to the moving direction of the seedling stage (80). The seedling transplanter according to claim 1, comprising a plurality of oblique grooves (124f) to be formed.

Images