JP3245332B2 - Aircraft lifting device for paddy field work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paddy field working vehicle such as a walk-behind rice transplanter, and more particularly, to a body lifting apparatus for controlling the height of a body by detecting earth pressure from a rice field.

[0002]

2. Description of the Related Art An example of a conventional body lifting device for a paddy field working vehicle is disclosed in Japanese Utility Model Laid-Open No. 4-133112. As shown in FIG. 7, the body lifting device disclosed in this publication includes a working clutch lever (planting clutch lever) 2 connected to a working clutch (planting clutch) 1 and a traveling clutch lever 5 connected to a traveling clutch 3. A paddle wheel is provided on a chain case that is rotatably supported by the body, and the chain case is connected to a hydraulic cylinder for adjusting the body height, and a hydraulic switching valve 10 that communicates with the hydraulic cylinder is further provided. The hydraulic switching valve 10 is connected to a body height detecting mechanism to automatically control the body height.

The body height detecting mechanism includes a float for detecting the body height by detecting earth pressure on a rice field surface, and a left and right boss portion rotatably supported by a shaft 81 passing through the transmission case 32. The tip of a protruding portion 12a protruding from the center of the left and right boss portions of the sensing rod 12 is inserted through and connected to a connecting plate 82 fixed to the float.

[0004] The vertical movement of the float is transmitted to the sensing rod 12 as rotation around the shaft 81, and the sensing rod 12 is transmitted to the shaft 81 by the support structure at both ends as rotation only in the vertical direction. You.
An arm 19 is rotatably supported on the left end of the body of the shaft 81, and a first plate 23 and a first plate 23 are provided between the arm 19 and the left boss portion of the sensing rod 12 supported by the shaft 81. Each of the second plates 26 is rotatably supported.

[0005] Further, one end of a rod 22 movably penetrating through the elongated hole 21a of the connecting plate 21 is fixed to the first plate 23, and the other end of the rod 22 is connected to the hydraulic switching valve. It is connected to ten operation arms 10a. The hydraulic switching valve 10 communicates with a hydraulic cylinder and a hydraulic pump, and the hydraulic switching valve 1 is controlled by the rotation position of the operation arm 10a.
0 is switched to the up position, the down position and the neutral position.
A return spring 93 is stretched on the operation arm 10a, and the return spring 93 urges the hydraulic switching valve 10 toward the lower position.

The second plate 26 has a long hole 26.
a, a first lug 26b protruding on one side, a second lug 26c protruding on the other side, and a spring hook 26
d. A bolt 95 having a fastening nut is screwed into the first lug 26 b so that the tip of the bolt 95 abuts the side surface of the first plate 23. Then, the rotation of the hydraulic switching valve 10 in the raising direction causes the first plate 2 to move irrespective of the position of the second plate 26.
3 is allowed to rotate in the upward direction. Further, the second lug 26c is in contact with the sensing rod 12, and a spring 96 is stretched between the spring hooking portion 26d and the bent portion of the sensing rod 12, so that the second plate 26 and the sensing rod 12 Are linked via a spring 96 or by abutment. In addition, the sensing rod 12, the rod 22,
The first plate 23, the second plate 26, and the spring 96 constitute a connecting member.

[0007] In addition, one of the right and left
The operating portion 1a and the setting clutch lever 2 of the setting clutch 1 are arranged, and a setting clutch connecting means for connecting the operating portion 1a and the setting clutch lever 2 is provided. Further, an operating portion 3a of the traveling clutch 3 and a traveling clutch lever 5 are disposed on one of the left and right sides of the body, and traveling clutch system coupling means for coupling between the operating portion 3a and the traveling clutch lever 5 is provided. Place.

The hydraulic switching valve 10 is provided with a first hole 21a and a rod
The planting clutch system connecting means is linked through a flexible mechanism, and the traveling clutch system connecting means is linked through a second flexible mechanism. The planting clutch system is connected to one of the right and left sides of the body. A lower hydraulic adjustment unit 27 that adjusts the relationship between the coupling means and the first accommodation mechanism and an upward hydraulic adjustment unit 29 that adjusts the relationship between the traveling clutch system connection means and the second accommodation mechanism are provided. I have.

The planting clutch system connecting means connects the first arm 14r to a planting lever rod 13 extending from the planting clutch lever 2, and connects the rod 15 to a lug 14a integrally formed with the first arm 14r. The planting clutch lever 2 is connected to the planting lever rod 13, and the planting clutch 1
Are connected.

The traveling clutch system connecting means fixes a branch plate 17 to an intermediate portion of a rod 16 extending from the traveling clutch lever 5 and connects an arm 19 to a tip end of the branch plate 17. Arm 19
The rod 20 is connected to the bracket 19a.

Based on such a configuration, when the planting clutch lever 2 and the traveling clutch lever 5 are in the on position or the off position, for example, the hydraulic switching valve 10 is moved up and down based on the first and second accommodating mechanisms. By operating in the direction, the body height is automatically controlled based on the body height detection mechanism. Further, when the planting clutch lever 2 is further rotated in the disengagement direction, in this state, the planting clutch 1 is in the disengaged position via the planting clutch system connecting means, and the first accommodation mechanism is allowed only in the lowering direction of the machine body. Thus, the accommodation range is restricted, and the hydraulic switching valve 10 operates in the downward direction based on the body height detection mechanism. On the other hand, when the traveling clutch lever 5 is further rotated in the disengagement direction, in this state, the traveling clutch is in the disengaged position via the traveling clutch system connecting means, and the amount of accommodation of the second accommodation mechanism in the downward direction is regulated. Further, the hydraulic switching valve 10 is forcibly switched to the raised position. Thereby, the cylinder portion of the hydraulic cylinder is raised along the rod, and the paddy wheel is lowered to raise the machine body.

[0012]

When the walk-type rice transplanter that has reached the headland is turned, the work (planting) clutch lever is operated to the off position while the traveling clutch lever is held in the on position. However, since the airframe is raised, the left or right side clutch is disengaged by gripping one of the left and right side clutch levers, and the turning operation is performed, the turning operation is complicated.

[0013] In addition, during paddy work before reaching the headland, there is a case where it is desired to change the traveling direction of the machine to the left or right to use it. In such a case, it is desired to disengage the clutch and change the machine to the left or right. Even at times, it may be troublesome for the aircraft to lift automatically.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and the further operation of the stop operation after the stop operation by the stop operation lever functions, the sensitivity of the fuselage in the descent direction is reduced. It is an object of the present invention to provide a body lifting device in a paddy field working vehicle adjusted to have a sharp ascent direction sensitivity.

[0015]

Therefore, in order to achieve the above object, a lifting device for a paddy field working vehicle according to the present invention includes a stop operation lever (2, 52L, 52R) operated when stopping paddy field work. An airframe (4) having a working unit and capable of ascending and descending relative to the paddy wheels (7);
An earth pressure sensor (11) suspended by the body (4) and moving by sensing the earth pressure from a rice field surface; an ascending position, a neutral position and a descending position according to the movement of the earth pressure sensor (11); A hydraulic switching valve (10) that can be switched to a position, and a hydraulic actuator (9) that moves the body (4) up and down relative to the paddy wheel (7) based on the hydraulic pressure from the hydraulic switching valve (10). A sensitivity adjusting member (71) for adjusting the sensitivity of the hydraulic pressure switching valve (10) based on the earth pressure sensor (11), and the stop operation lever. (2,52L, 5
2R) and the sensitivity adjustment member (71) function in the operation range where the stop operation by the stop operation levers (2, 52L, 52R) functions. Connecting means (65-6)
8, 78, 79, 100), and the stopping operation is performed.
Lever (2, 52L, 52R) and the hydraulic switching valve
(10) and the stop operation lever (2, 52L, 5).
2R) from the state in which the stop operation is operated by the operation in the operation area, the stop operation lever (2, 52L, 52).
By further operation of R), the connecting means (65 to 68, 78 , 7) is set so that the sensitivity of the body (4) in the descending direction by the earth pressure sensing element (11) becomes dull and the sensitivity in the ascending direction becomes sharp.
9, 100) .

Preferably, the stop operation lever is a left and right side clutch lever (52L, 52R) for connecting and disconnecting the power transmitted to the left and right paddy wheels (7), respectively. ), The side clutch is disengaged, and in the disengaged state, the hydraulic pressure switching valve (10) is operated by the earth pressure sensor (11).
Is adjusted.

[0017]

According to the above arrangement, when the paddy field vehicle reaches the field, the operator operates a stop operation lever such as a work clutch lever (2) or left and right side clutch levers (52L, 52R). Then, the connecting means (6
5-68, 78, 79) via a sensitivity adjusting member (71)
Swings in a direction to reduce the urging force of the return spring (93).

In this state, for example, when the handle (36) is lifted and the earth pressure sensing element (11) is acted on in the direction in which the earth pressure sensing increases, the movement of the earth pressure sensing element (11) is caused by this. The operation arm (10a) of the hydraulic switching valve (10) is moved to the raised position via the interlocking members (12, 26, 23, 22).

The stop operation lever (2, 52)
L, 52R), the biasing force of the return spring (93) is set to be smaller than the operating resistance of the hydraulic switching valve (10) regardless of the operating position of the hydraulic switching valve (10). In this case, by lifting the handle (36) of the paddy field working vehicle, the earth pressure sensor (1) is lifted.
1) is once moved in the ascending direction and the hydraulic pressure switching valve (10) is in the ascending position, and even if the earth pressure sensor (11) is moved in the descending direction by returning the handle (36) or the like, the hydraulic pressure is not changed. The switching valve (10) remains held at the raised position, and the body (4) continues to be raised to the upper limit position (up state).

The stop operation lever (2, 52)
L, 52R) in the operating state.
The biasing force of 3) is adjusted by, for example, the adjusting means (104) so that the operating resistance is smaller than the operating resistance when the hydraulic switching valve (10) is in the raised position and the operating resistance when the hydraulic switching valve (10) is in the neutral position. When the steering wheel (36) is lifted and the earth pressure sensing element (11) is in the earth pressure sensing state and the hydraulic pressure switching valve (10) is operated to the raised position, the body (4) is set. ) Is raised and the earth pressure sensing state is released by returning the handle (36), the return spring (93) returns the operating arm (10a) to the neutral position, and moves the body (4) to the raised position. It will be in the semi-automatic state of raising.

In the present invention, the stop operation lever is used.
Bar (2, 52L, 52R) and hydraulic switching valve (10)
When the stop operation lever (2, 52L, 52R) is operated, a stop operation (for example, disengagement of the clutch) functions, and then further stop operation is surely performed by further lever operation. The sensitivity of the body (4) by the sensor (11) in the descending direction is low and the sensitivity in the ascending direction is sharp,
Via connecting means (65-68, 78, 79, 100)
Because of the connection , during the paddy field operation, the planting operation can be performed as usual, and the stop operation (for example, the disconnection of the clutch) is activated due to a slight erroneous operation of the stop operation lever (2, 52L, 52R). Even if this is the case, there is no possibility that the body (4) will be automatically raised immediately, so that there is an advantage that there is no need to worry about some lever operation mistakes.

Note that the reference numerals in parentheses described above are for comparing the drawings, but do not limit the configuration of the present invention.

[0023]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 to 3 show an embodiment of the present invention. Members which are the same as or correspond to those described in the conventional example are denoted by the same reference numerals, and redundant description is omitted.

As shown in FIG. 2, the walking rice transplanter P as a paddy field working vehicle has an engine 31, a transmission case 32, a frame 33, and the like in front of the body 4 and
Behind the body 4, a handle 36 is extended, and a seedling mounting table 37 is slidably supported in the left-right direction. A planting rod 38 is provided at the lower end of the seedling mounting table 37. Further, a float 11 as an earth pressure sensor is suspended below the frame 33 so as to be swingable about a swing support point 11a at the rear. The float 11 constitutes a body height detection mechanism for detecting the earth pressure on the rice field surface and detecting the body height. An output shaft 39 projects from the left and right ends of the transmission case 32 and penetrates the transmission case 32. Chain ends 6 and 6, which are swingable about the output shaft 39, are supported at both ends of the output shaft 39, and Paddy wheels 7, 7 are supported at the tips of the chain cases 6, 6, respectively.

A hydraulic cylinder 9, which is a hydraulic actuator for adjusting the height of the fuselage, is disposed between a bracket 41 fixed to the engine 31 and a bumper member 42 fixed to the transmission case 32. . The hydraulic cylinder 9 has a rod 9a connected to the bracket 41.
And a cylinder movable type fixed to the bumper member 42, and the cylinder portion 9b reciprocates up and down by being guided by the rod 9a.

Further, a pin 43a is attached to the cylinder portion 9b.
A balance arm 43 is swingably connected to the left and right around the center, and both ends of the balance arm 43 are rods 45, respectively.
It is connected to arms 6a, 6a fixed to the base ends of the swing chain cases 6, 6 via 45. A horizontal control hydraulic cylinder 46 is interposed between the intermediate portion of the balance arm 43 and the cylinder portion 9b. The cylinder 46 is controlled based on an inclination sensor 47 to move the balance arm 43 right and left. The left and right paddy wheels 7,
Adjust 7 upside down.

As shown in FIG. 2, work (planting) is performed on the guide plate 50 provided on the handle 36.
The clutch lever 2 and the traveling clutch lever 5 are arranged. Further, left and right side clutch levers 52L and 52R as stop operation levers are disposed on the left and right grip portions 36a of the handle 36, respectively.

In FIG. 2, reference numeral 53 denotes a main speed change lever, and 55 denotes a swing rotary shaft.
The reciprocating motion of the screw shaft arranged in the transmission case 32 is transmitted as a swinging motion via an arm 56 and further transmitted as a left-right reciprocating motion of the seedling mounting table 37 via an arm 57.

The planting clutch lever 2 guided in the right groove of the guide plate 50 is transmitted via a wire 60b to a right plate 59b rotatably supported via a bracket below the handle 36. I have.
The traveling clutch lever 5 guided in the left groove of the guide plate 50 has a left plate 59a rotatably supported via a bracket below the handle 36.
Through a wire 60a. The rod 13 (see FIG. 1) for the planting lever extends forward of the body 4 from the right plate 59b, and the left plate 5
A rod 16 (see FIG. 3) extends forward of the fuselage 4 from 9a. Further, the left and right side clutch levers 52
Wires 61L and 61 extending from L and 52R, respectively.
The R is guided downward through the inside of the handle 36 and further forward along the frame 33.

As shown in FIG. 1, a connecting shaft 65 extending in the lateral direction of the vehicle body is supported rotatably in the middle of the vehicle body 4 through a bracket 62 provided upright on the frame 33, as shown in FIG. Left and right angle members 66 and 67 each having a U-shape in plan view are rotatably supported on both left and right sides of the connection shaft 65. Further, at both ends of the connecting shaft 65, a U-shaped operating link 68 which extends to extend over the crotch of the left and right angle members 66 and 67 and which rotates by contacting the right and left angle members 66 and 67 rotates. It is freely supported. That is, the left and right angle members 66 and 67 rotate and
When it comes into contact with the operation link 68, the connection shaft 65 is pivotally supported.
The operating link 68 is configured to rotate.
You. Further, the left end of the operating link 68
The connecting arm 78 extends substantially in the perpendicular direction, and the connecting arm 78 is fixed.
One end of a connecting rod 79 is connected to the end of the connecting arm 78 of FIG.
Has been stopped. A U-shaped arm member 100 is integrally fixed to the operation link 68 by means such as welding.

As shown in FIGS. 4 (a) and 4 (b), a female screw member 102 having a thread formed on the inside thereof is integrally fixed to both bent end portions of the arm member 100. Adjusting bolt 104 so as to penetrate screw member 102
Is screwed. The adjusting bolt 104 has a screw-side end protruding on the side opposite to the head thereof in contact with the left and right angle members 66 and 67 and can be adjusted to an arbitrary position by a fixing nut 106. Thereby, the adjustment bolt 104 is connected to the left and right side clutch levers 52.
It serves to adjust the operation position of a swing member 71 described later with respect to the operation positions of L and 52R.

The adjusting bolt 104 has an end on the screw side abutting on the left and right angle members 66 and 67. This makes it easy to finely adjust the projecting amount of the adjusting bolt 104. , Left and right angle members 6
Since the contact surface with 6,67 is small, there is no possibility that dust or the like is interposed in the middle.

As described above, the left and right side clutch levers 5
Operate 2L, 52R to pull left and right wires 61L, 61R.
When the left and right angle members 66 and 67 rotate, the adjustment bolt 104 abutting on the right and left angle members 66 and 67 also rotates, and further, via the arm member 100, the operation link 6 integrated therewith.
8 is configured to rotate.

One end of a connecting member 69 having a plurality of connecting holes 69a is rotatably supported at the left end of the connecting shaft 65, and a spring 7 is provided in the connecting hole 69a.
One end of the spring 70 is locked, and the other end of the spring 70 is locked in a locking hole 71a on the upper end surface of a swinging member 71 as a sensitivity adjusting member rotatably supported. One end of a return spring 93 is locked in the locking hole 71a,
The other end of the return spring 93 is locked to the operation arm 10a of the hydraulic switching valve 10. That is,
The swing member 71 serves to adjust the sensitivity of the hydraulic switching valve 10 based on the float 11.

As shown in FIG. 5, the mounting portion of the return arm 93 of the operation arm 10a, the locking hole 71a of the swinging member 71, and the connecting hole 6 of the connecting member 69 are provided.
9a is arranged substantially linearly. This allows
The urging force of the spring 70 and the return spring 93 is
It can be transmitted without being reduced by friction.

The swing member 71 can be adjusted in a direction in which the urging force of the return spring 93 is weakened by adjusting the amount of protrusion of the adjustment bolt 104 provided on the arm member 100 to a large value. This allows the hydraulic switching valve 10 to respond instantaneously even with a slight increase in earth pressure applied to the float 11,
In this manner, adjustment can be performed so that the sensitivity of the body 4 in the ascending direction by the float 11 becomes sharp and the sensitivity in the descending direction becomes dull.

Further, as described above, the operation link 6
The left end of 8, this interlocking arm 78 extending in a substantially perpendicular direction is fixed relative to, the tip of the interlocking arm 78 have been sealed at one end of the connecting rod 79 is engaged, the cooperative arm 78 And the connecting rod 79 constitute a connecting link. The connecting shaft 65, the left and right angle members 66,
67, the arm member 100, the operating link 68, and the connecting link (the connecting arm 78 and the connecting rod 79) constitute connecting means, and the connecting means allows the left and right side clutch levers 52L and 52R and the swinging member 7 to be connected.
1 is connected.

In the above, the connecting means (65-6)
8, 78, 79, 100) when the left and right side clutch levers 52L, 52R and the swing member 71 are turned off by disengaging the side clutch by operating the left and right side clutch levers 52L, 52R. To
The rocking member 71 is connected so that the sensitivity of the hydraulic switching valve 10 is adjusted by rocking.

Further, in the present invention, the stop operation levers (52L, 52R) are changed from the stopped state by the operation in the operation area where the stop operation by the stop operation levers (52L, 52R) functions. The operation is adjusted so that the downward sensitivity of the body (4) by the earth pressure sensing element (11) is low and the sensitivity in the upward direction is sharp.

That is, as shown in FIG. 6 (and FIG. 3), when the body 4 is turned, the clutch is disconnected by grasping one of the left and right side clutch levers 52L, 52R. , When the left and right side clutch levers 52L, 52R shift from the area A to the area B in the figure, the side clutch is disengaged and becomes OFF. In this state, the swing member 71 does not swing yet (the automatic hydraulic state does not work). When the left and right side clutch levers 52L and 52R are further gripped and the levers reach the point B ', the swinging member 71 swings, so that the lowering sensitivity of the body 4 in the descending direction and the sensitivity in the ascending direction are sharper. Adjusted (hydraulic automatic state).

For this reason, according to the present embodiment, when the left and right side clutch levers 52L, 52R are gripped and the levers 52L, 52R exceed the region A, the clutch is first disengaged, and then the left and right side clutch levers 52L, 52R are released. Clutch lever 52
By operating the L and 52R to the point B ', the lowering sensitivity of the airframe 4 is adjusted so that the lowering sensitivity is sharpened, and the upward sensitivity is sharpened. The airframe 4 responds more sensitively to the sensing of the earth pressure of the float 11.

When the body 4 is turned, the hydraulic pressure is raised or the semi-automatic state is raised when the left and right side clutch levers 52L and 52R are fully squeezed. For example, during normal planting work, the body 4 In some cases, it is desired to slightly change the traveling direction to the left or right without turning. In such a case, even if the side clutch is disengaged, the planting work can be performed while changing the direction of the machine body 4 to the left or right by preventing the machine body 4 from being in the hydraulic automatic state.

In this way, the planting operation can be performed as usual, and the left and right side clutch levers 52L, 5L can be used.
There is no danger that the fuselage 4 will suddenly rise due to slight erroneous operation of the 2R, and the right and left side clutch levers 5
The link between the operation area of 2L and 52R and the float 11 is engaged, and the operability is improved.

The other end of the connecting rod 79 is connected through a locking arm 83 fixed to the lower end of the swinging member 71. The connecting end of the connecting rod 79 that penetrates the locking arm 83 is a screw portion 79a, and nuts 84, 84 are screwed into the screw portion 79a with the locking arm 83 interposed therebetween.

The inner portion 66a of the left angle member 66
Is connected to a wire 61L extending from the left side clutch lever 52L, and a wire 61R extending from the right side clutch lever 52R is connected to the inner portion 67a of the right angle member 67. Further, the connecting shaft 65 rotatably supports an intermediate angle member 14 in which a left arm 141 and a right arm 14r are integrally formed between a left angle member 66 and a right angle member 67. A planting lever rod 13 extending from the planting clutch lever 2 is connected to a right arm 14r of the intermediate angle member 14. Further, a rod 72 is connected to an outer portion 67b of the right angle member 67, and a tip of the rod 72 is connected to an operating portion 73 of the right side clutch. A rod 74 is connected to an outer portion 66b of the left angle member 66, and a tip of the rod 74 is connected to an operating portion 75 of the left side clutch.

Further, a lug 14a is formed integrally with the right arm 14r. The rod 15 penetrates the lug 14a, and a lug 14a is formed between the lug 14a and a nut 76 screwed to the tip screw portion 15a. The spring 77 is contracted. Further, the operating link 6 is attached to the left arm 141.
An operation projection 14b that comes into contact with and operates the projection 8 is protruded. The distal end of the rod 15 is connected to one end of the operating portion 1a of the planting clutch 1 and the operating portion 1a
A spring 80 is stretched at the other end of. A connecting plate 21 is connected to the tip of the left arm 141 by bolts and nuts.
1 has an elongated hole 21a formed at the tip end of its rotation. The other end of the rod 22 connected to one end of the operating arm 10a of the hydraulic switching valve 10 passes through the elongated hole 21a, and the first plate 23 is fixed.

On the other hand, one end of a rod 22 is fixed to the first plate 23 through the long hole 21a of the connecting plate 21. The other end of the rod 22 is connected to the operating arm of the hydraulic switching valve 10. 10a. One end of the rod 22 is connected to the long hole 2 of the connecting plate 21.
The first accommodation mechanism is constituted by moving in the inside 1a.

A pin 25a is implanted in the plate 25 extending from the traveling clutch lever 5 via a raising hydraulic pressure adjustment portion 29, and the pin 25a is formed by drilling the second plate 26. It is movably fitted along the hole 26a, and thus constitutes a second accommodation mechanism.

Next, the operation will be described.

In order to perform planting work with the walking rice transplanter P,
The traveling clutch lever 5 is operated to the on position, the traveling clutch operating section is operated via a wire 60b extending to the left side of the machine body, a traveling rod, and the like, so that the traveling clutch is connected and the planting clutch lever 2 is moved. Operate to the entering position, the wire 60a extending to the right side of the body, the rod 13 for the planting lever, the right arm 14r of the intermediate angle member 14
Then, the operating section 1a is operated via the rod 15 and the planting clutch 1 is brought into the connected state. Thus, the walking rice transplanter P travels while the paddy wheel 7 is driven, and the planting rod 38 rotates to perform the planting operation. At this time, the pin 25a of the plate 25 interlocked with the traveling clutch lever 5
Is located in the middle of the long hole 26a of the second plate 26,
Since the tip of the rod 22 is located in the middle of the long hole 21a of the connecting plate 21, in this state, the rod 22 moves based on the urging force from the return spring 93 of the hydraulic switching valve 10. Also, the tip is a long hole 21a,
The first plate 23 and the second plate 26 do not rotate only by moving the plate 26a. Therefore, float 1
1 is transmitted as swinging of the sensing rod 12, transmitted to the second plate 26 via the spring 96, and then transmitted to the second plate 26 via the first plate 23 and the rod 22. 10 operating arms 10
a. Accordingly, the hydraulic switching valve 10 is switched to the raising position, the lowering position, and the neutral position so that the body 4 is at a constant height with respect to the rice field based on the sensing of the earth pressure of the float 11. The height of the body is automatically controlled by moving the wheels 7, 7 up and down.

Also, during the work before the body 4 reaches the headland,
For example, when it is desired to change the traveling direction of the body 4 to the left or right, if the left and right side clutch levers 52L and 52R are operated to about half (within the point B '), the side clutch is disengaged and the hydraulic pressure is automatically adjusted. The state can be set to a non-working state, whereby the planting operation can be performed smoothly while changing the traveling direction to the left and right without raising the body 4.

Even if one or both of the traveling clutch lever 5 and the planting clutch lever 2 is operated to the off position, the tip of the rod 22 and the pin 25a remain
First plate 2 in the middle of 1a and 26a
3, the hydraulic switching valve 1 does not impede the free movement of the second plate 26,
0 is automatically controlled.

Next, a case where a walking rice transplanter reaches a headland and turns it, for example, will be described.

When the paddy field work vehicle reaches the field, the operator operates, for example, the work clutch lever 2 or the left and right side clutch levers 52L and 52R. Then, the operating link 68 is rotated by the left and right angle members 66 or 67 via the wire 61L or 61R, and then the swing member 71 is biased by the spring 93 via the operating link 68, the link arm 78 and the connecting rod 79. Swing in the direction to reduce

In this state, when, for example, the handle 36 is lifted and the float 11 is acted on in the direction in which the earth pressure sensing increases, the float 11 transmits the movement to the sensing rod 12, and then the float 11 transmits the movement to the second sensing rod 12. Plate 2
6 and the first plate 23 are rotated. Then, by the rotation of the first plate 23, the operation arm 10a of the hydraulic switching valve 10 moves to the raised position via the rod 22.

When the working clutch lever 2 or the left and right side clutch levers 52L and 52R are in the above-described operating state, the urging force of the spring 93 does not depend on the operating position of the hydraulic switching valve 10. When the operating resistance is set to be smaller than the operation resistance of 10, when the float 11 is once moved in the ascending direction by lifting the handle 36 of the walk-behind rice transplanter P, and the hydraulic switching valve 10 is set to the ascending position, Even if the float 11 is moved in the descending direction by returning the handle 36, the hydraulic switching valve 10 remains held at the ascending position, and the body 4 continues to ascend to the upper limit position (up state).

When the work clutch lever 2 or the left and right side clutch levers 52L and 52R are operated, the urging force of the spring 93 is applied to the hydraulic switching valve 1.
0, the operating resistance is set to be smaller than the operating resistance in the neutral position, and the operating resistance is set to be substantially equal to the operating resistance in the neutral position.
The aircraft 4 is raised while the hydraulic switch valve 10 is in the raised position and the body
6. When the earth pressure sensing state is released by returning 6, the return spring 93 returns the operation arm 10a to the neutral position, and enters a semi-automatic raising state in which the machine body 4 is held at the raised position.

When the walking type rice transplanter P completes the traverse on the headland in a state where the machine body 4 is lifted in the above-mentioned raised state or the semi-automatically raised state, the operator operates the work clutch lever 2 or the left and right side clutch levers 52L. , 52R
Back. Then, the swing member 71 is moved via the operating link 68, the link arm 78, and the connecting rod 79 to the spring 93.
Swings so as to return to a position where a predetermined urging force is applied, and returns the operation arm 10a to the lowered position, and the body 4
1 descends until it touches the ground and reaches the proper working position.

[0060]

As described above, according to the present invention, a further operation of the stop operation lever allows the stop operation lever to be further operated from the state in which the operation is stopped in the operation area where the stop operation by the stop operation lever functions. Because the machine was configured so that the sensitivity in the descending direction of the aircraft was low and the sensitivity in the ascending direction was adjusted sharply, normal planting work could be performed as usual, and slight erroneous operation when gripping the stop operation lever Is performed, there is only a difference between whether or not the stop operation functions or not, and there is no possibility that the aircraft will automatically rise. In addition, the aircraft automatically lifts and stops after the stop operation by the stop operation lever is fully functioning, so that the operation area of the stop operation lever and the earth pressure sensor are engaged, and the operation is performed. The performance is improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a configuration of a body lifting device in a paddy field working vehicle according to the present invention.

FIG. 2 is a side view showing the whole of a walking rice transplanter to which the body lifting device can be applied.

FIG. 3 is a side view showing an airframe elevating device in the walking rice transplanter according to the first embodiment.

FIG. 4A is an external perspective view of an operation link, an arm member and an adjustment bolt integrally fixed to the operation link. (B) is a front view thereof.

FIG. 5 is a plan view of a main part of FIG. 3;

FIG. 6 is an enlarged view of a side clutch lever.

FIG. 7 is an exploded perspective view showing an example of a body lifting device in a conventional paddy working vehicle.

[Explanation of symbols]

2 Work clutch lever (planting clutch lever) 4 Airframe 7 Paddy wheel 9 Hydraulic actuator (hydraulic cylinder) 10 Hydraulic switching valve 10a Operation arm 11 Earth pressure sensor (float) 12 Sense rod 22 Rod 36 Handle 52L Stop operation lever (Left) 52R Stop operation lever (right side clutch lever) 65 Connecting shaft 66, 67 Left / right angle member 68 Operating link 71 Swing member 78 Linking arm 79 Connecting rod 93 Return spring 100 Arm member 104 Adjusting bolt

Claims (2)

(57) [Claims] 1. An operation lever for stopping the operation of a paddy field, a body having a working part, which can be moved up and down relatively to a paddy wheel, and an earth pressure from a rice field suspended by the body. An earth pressure sensor that senses and moves; a hydraulic switching valve that is switched to an ascending position, a neutral position, and a descending position in accordance with the movement of the earth pressure sensor; and the airframe based on hydraulic pressure from the hydraulic switching valve. A hydraulic actuator for raising and lowering the paddle wheel relatively to the paddy wheel; anda body lifting device for a paddy working vehicle, comprising: a sensitivity adjusting member that adjusts the sensitivity of the hydraulic switching valve based on the earth pressure sensor. The stop operation lever and the sensitivity adjustment member are connected so that the sensitivity adjustment by the sensitivity adjustment member functions in an operation range in which the stop operation by the stop operation lever functions. Comprising a binding means, the stop operation by the operation of the stopping operation lever and the hydraulic switching valve, in the operating region of the stop lever
From the state in which the connecting means is operated by further operating the operation lever for stopping, so that the sensitivity of the earth pressure sensing element in the descent direction of the body is dull and the sensitivity in the ascending direction is sharp.
A body lifting device for a paddy field working vehicle, wherein the body lifting device is connected via a vehicle. 2. The stop operation lever is a left and right side clutch lever for connecting and disconnecting power transmitted to the left and right paddy wheels, respectively, and the side clutch is disengaged by operating the side clutch lever. The body lifting device for a paddy field working vehicle according to claim 1, wherein the sensitivity of the hydraulic pressure switching valve by the earth pressure sensor is adjusted in an off state.