JPS6341847Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a body height detection device for a rice transplanter, particularly a walking rice transplanter, and more particularly to a return and relief spring for a hydraulic switching valve thereof.

Conventionally, rice transplanters equipped with a body height control device required an operating lever in addition to the main (traveling) clutch lever and work (planting) clutch lever to operate the hydraulic mechanism of the body height control device. . For this reason, when turning the headland, it is necessary to turn the planting clutch lever off at the same time as turning with the side clutch, and then move the hydraulic control lever from automatic to the raised position, making the operation very cumbersome and difficult. I was making it a thing. Therefore, there is a device that links a hydraulic control lever to the planting clutch lever and switches the hydraulic control lever to the raised position in conjunction with the cutting operation or overstroke of the planting clutch lever from the off position. After disengaging the clutch and lowering the machine using the hydraulic control lever to replenish seedlings, when starting planting again, there were problems such as the machine rising if the hydraulic control lever was set to automatic.

Generally, the aircraft height detection device detects the ground pressure from the field surface caused by the float to detect the height of the aircraft relative to the float, and thereby operates the hydraulic switching valve via a link mechanism. At this time, a return spring is required to apply ground pressure (automatically sensed load) to the float and return force to the hydraulic switching valve, and when operating the switching valve manually, the movement of the switching valve depends on the float position. A spring escape mechanism is required to avoid restriction. The escape mechanism using the spring is made of a spring stronger than the return spring, as shown in Japanese Utility Model Publication No. 55-8496, and furthermore, during automatic control based on a float, the sensing arm and the connecting arm are integrated by a stopper pin. Although it is specified that the connecting arm can be rotated, when the connecting arm is manually lowered, it is necessary to rotate the connecting arm against the spring, which requires an extremely large operating force. Therefore, operating the control lever during manual operation has become difficult.

Due to the above-mentioned circumstances, the present invention connects an airframe height detection mechanism to a rotatably provided valve operating body connected to a switching valve of a hydraulic mechanism, and
A main clutch lever and a working clutch lever are connected to opposite sides of the rotation center of the valve operating body through play mechanisms, so that the valve operating body acts like a balance, and the aircraft is controlled by both clutch levers. It is configured so that the ascending side and the descending side of the aircraft cannot be operated at the same time, and a return spring is provided to apply pressure in the grounding direction to the aircraft height detection mechanism, and the aircraft height detection mechanism and the valve operating body are A link having an escape mechanism that allows movement by a predetermined amount of play is interposed between the two, and an escape spring that biases the escape mechanism so that the amount of play is eliminated,
It is an object of the present invention to provide a body height detection device for a rice transplanter which eliminates the above-mentioned drawbacks by directly operating a switching valve during manual operation.

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

The rice transplanter 1, as shown in FIGS. 1 and 2,
It has a fuselage 5 consisting of an engine 2, a transmission 3, etc., and below the fuselage 5, a float 6 constituting an aircraft height detection mechanism is supported around an adjustment fulcrum 7 at the rear and by a link 8 at the front. It is suspended so that it can swing freely. Further, a handle 9 is extended at the rear of the machine body 5, a seedling stand 10 is fixed along the handle 9, and a planting rod 11 receives power from the transmission 3 via a planting clutch. It is arranged as follows. Furthermore, the chain case 1 is swingably supported by a shaft 12 on the fuselage 5.
A paddy wheel 15 is disposed through the chain case 13, and the chain case 13 is connected through a link to a piston 16a of a hydraulic cylinder 16 fixed to the body. The hydraulic cylinder 16 is of a double acting type as shown in FIG. 7, and communicates with a hydraulic pump 19 via a rotary switching valve 17. Therefore, by operating the valve, the height of the paddy wheel 15 relative to the body 5 is changed. It can be set freely.

And, as shown in detail in FIGS. 3 and 4,
A semicircular plate 20 constituting a valve operating body is fixed to the operating shaft 17a of the rotary valve 17, and the plate 20 has two elongated holes arranged on the same circumference and having approximately the same length. 20
a, 20b are formed. These long holes 20
Pins 21a and 22a provided at the tips of the wires 21 and 22 are fitted into the pins a and 20b, respectively, and the other ends of the wires 21 and 22 are connected to a main clutch lever 25 and a planting clutch lever 26, which will be described in detail later.
are connected to each other. Further, as shown in FIG.
A pin 27 is fixedly provided via 0c.

On the other hand, a sensing rod 29 constituting a body height sensing mechanism is pivotally supported on the front link 8 portion of the float 6, and the other end of the rod 29 is connected to an arm 30. As shown in FIG. 6, the arm 30 is rotatably supported by a pin 30a fixed to the body 5, and another arm 31 having a bending/engaging portion 31a is attached to the pin 30a. The arm 31 is pivoted and engaged by the engaging portion 31a only when the arm 30 rotates upward, ie, counterclockwise, and rotates together. Further, the arm 31 has a pin 31b implanted at the other end, and a return spring 33 is tensioned between a plurality of selection pins 32 provided on the body 5.
1a is biased clockwise so as to engage the arm 30 and apply a predetermined ground pressure to the float 6. Further, a link 34 is passed between the pin 27 of the plate 20 and the pin 31b of the arm 31, and both pins 27, 31b are connected to elongated holes 34a provided at both ends of the link 34 constituting the escape mechanism. , 34b, and are connected by a weak tension spring 35 (relief spring).

On the other hand, the main clutch lever 25 and the planting clutch lever 26, as shown in FIGS. 8 and 9,
Lever guide plate 36 provided at handle 9 part
The levers 25, 26 are rotatably supported by a support shaft 37, and the levers 25, 26 are guided by guide grooves 36a, 36b, respectively.
A wire 39 is connected to the clutch, and a wire 40 is connected to the planting clutch. Further, the main clutch lever 25 is attached to the support shaft 37.
Arms 41 and 42 are rotatably supported adjacent to the planting (work) clutch lever 26, and each arm 41 and 42 is connected to wires 21 and 22 that are connected to the plate 20, respectively. At the same time, they abut rods 25a and 26a fixed to each lever 25 and 26, and can rotate together. The guide groove 36a of the main clutch lever 25 has a crank shape, and the main clutch is engaged at the upper end position A and disengaged at the middle position B. At the A-B position, the rod 25a is not connected to the arm 41. The arm 41 is not in contact with the wire 21
Spring 43 provided at the other end (Fig. 2)
The pin 21a at the other end of the wire 21 is set so as to abut the stopper pin 45 and be located at the center of the elongated hole 20a in the neutral position of the plate 20, and is further positioned one step lower, which serves as a locking part. When the arm 41 is engaged with the rod 25
It rotates together with the lever 25 via the pin 21
a is in contact with the outer end of the elongated hole 20a, and is further lowered by two steps D.
When the pin 21a rotates until the plate 20 is rotated, the pin 21a rotates the plate 20 together. In addition, a spring 46 is fixed to the back surface of the plate 36 at an intermediate portion of the guide groove 36b of the planting clutch lever 26, forming a resistance stopper. At the E-F position, the rod 26a does not contact the arm 42, and the arm 42 contacts the stopper pin 49 due to the spring 47 (FIG. 2) provided at the other end of the wire 22. In addition, the pin 22a at the other end of the wire 22 is set to be located at the center of the elongated hole 20b, and when the pin 22a passes the resistance stopper 46 and reaches the lower position G, the arm 42 moves to the lever 26 via the rod 26a. When the pin 22a rotates together with the wire 2 and comes into contact with the outer end of the elongated hole 20b, and reaches the second lower position H of the guide groove 36b, the wire 2
2 is pulled, and the pin 22a rotates the plate 22.

Next, the operation of this embodiment based on the above configuration will be explained.

To perform planting work with the rice transplanter 1, the main clutch lever 25 is switched from the off position B to the on position A,
The main clutch (travel clutch) is connected and
The planting clutch lever 26 is moved from the off position F to the on position E.
Then, the paddy field wheels 15 of the rice transplanter 1 are driven to travel, and the planting rod 11 is rotated to perform planting work.
26 is in contact with the stopper pins 45, 49 regardless of the insertion positions A, E and the disconnection positions B, F of the plate 20 in the neutral state, and the pins 21a, 22a are in contact with the plate 20 in the neutral state via the wires 21, 22 as shown in FIG.
The plate 20 is located at the center of the long holes 20a, 20b. As a result, the plate 20 can rotate in the upward direction Y and downward direction Z with respect to the neutral position X within the range of the long holes 20a, 20b, and the plate 20 rotates following the up and down movement of the float 6, and the valve 17 is switched between forward and reverse to operate the hydraulic cylinder 16, thereby automatically controlling the height of the aircraft over the entire range. For example,
When the ground pressure of the wheel 15 against the tillage pan is weak, a large pressure acts on the float 6 from the paddy field surface, lifting the front of the float 6 relative to the machine body 5. This causes the arm 30 to rotate counterclockwise via the sensing rod 29, and further causes the arm 31 to rotate integrally in the same direction via the engaging portion 31a, and with the pins 31b, 27 held at the inner ends of the long holes 34b, 34a by the spring 35, the plate 20 rotates in the downward direction Z via the link 34. This switches the valve 17 and causes the piston 16a of the hydraulic cylinder 16 to extend, rotating the oscillating chain case 13 and moving the paddy field wheel 15 downward. Then,
When the machine body 5 rises to a predetermined height and the pressure from the field surface acting on the float 6 reaches a predetermined value, the front part of the float swings downward relative to the machine body, and the plate 20 returns to the neutral position X through the rods, arms and links.
Conversely, when the ground pressure of the paddy field wheels 15 on the tillage pan is large, the front of the float 6 is lowered,
Each rod 29, arms 30, 31 and link 34
The plate 20 rotates in the upward direction Y via the plate 20, raising the paddy field wheels 15 by a predetermined amount and lowering the machine body 5 to a predetermined height. In this way, the height of the machine body 5 is always properly maintained by automatically controlling the height of the wheels 15.

At this time, in order to change the automatic sensing load, if the spring 33 is to be applied to a different selection pin 32, for example, to increase the biasing force acting on the float 6, even if the pin 32a is replaced with 32b, the spring 33 will be applied accordingly. There is no need to replace the spring 35, and the weak spring 35 can be used as is.

In addition, by operating the main clutch lever 25 and the planting clutch lever 26, the movement of the plate 20 is restricted, that is, from the neutral position X only in the upward direction Y, or from the neutral position Even if the plate 20 is fixed, or if the plate 20 is forcibly rotated in the upward direction Y or the downward direction Z, the grounding pressure from the float 6 or the biasing force from the spring 33 acts to try to rotate the plate 20. However, these forces are caused by the pin 31b hitting the elongated hole 3 of the link 34.
4b or by the pin 27 sliding along the elongated hole 34a against the spring 35 and does not impede manual movement of the plate 20.

That is, when the main clutch lever 25 remains in the engaged position A and the planting clutch lever 26 is moved to the lower position G beyond the resistance stopper 46, the wire 22 is pulled and the pin 22a is moved, and the plate 20 is reversed from the neutral position. Clockwise rotation is restricted. Therefore, the machine is in a semi-automatic position where only the body can rise, and at this time, the float 6 hangs as the body 5 rises, but the weight of the float is reduced by the arm 31 following the arm 30 as it separates from the engaging portion 31a of the arm 31. Therefore, it has no effect on the link 34.

In addition, when the main clutch lever 25 is switched to the lower position C while the planting clutch lever 26 is held in the engaged position E, the wire 21 is pulled and the pin 2
1a, and the plate 20 is restricted from rotating clockwise from the neutral position. Therefore, it is in a semi-automatic position where the aircraft can only be lowered, and at this time, the lowering of the aircraft 5 causes the sensing rod 29 to be removed from the float 6.
A counterclockwise force acts on the arm 30 through the pin 3 of the arm 31.
1b moves through the elongated hole 34b against the weak relief spring 35, thereby being absorbed.

Furthermore, when the main clutch lever 25 is locked in the one step lower position C and the planting clutch lever 26 is held in the one step lower position G, both wires 21 and 22 are pulled, both pins 21a and 22a are moved, and the plate 20 is in the neutral position. position, thus fixing the fuselage in place.

Furthermore, move the planting clutch lever 26 to the two-step lower position H.
When operated, the wire 22 is further pulled, the plate 20 is rotated clockwise, and the aircraft is raised.
At this time, as in the case of semi-automatic lifting, since the engaging portion 31a is separated from the arm 30, the weight of the float 6 does not act on the link 34, and therefore the plate 20
And there is no action on the lever 26 via the wire 22. Also, the main clutch lever 25
When the pin 21a contacts the end of the elongated hole 20a of the plate 20, the movement of the plate 20 is restricted, and the planting clutch lever 26 is operated to the two-step lower position H. Can not do it.

Further, when the main clutch lever 25 is operated to the second lower position D, the wire 21 is further pulled, the plate 20 is rotated counterclockwise, and the aircraft is lowered.
At this time, the reaction force from the float 6 is transferred to the sensing rod 29.
The arm 31 is relatively rotated counterclockwise via the arm 30, but the rotation of the arm 31 is caused by the pin 3.
1b and 27 are absorbed by sliding through the elongated holes 34b and 34a, respectively, against the relief spring 35. Therefore, it is sufficient to operate the main clutch lever 25 against the weak escape spring 35.
In addition, if the main clutch lever 25 is rotated to the two-step lower position D while the planting clutch lever 26 is held in the one-step lower position G by mistake, the planting clutch lever 26
6 is moved to the disconnected position F against the resistance stopper 46.

Note that long holes 34a and 34b are provided above and below the link 34.
Although the main clutch lever 2
5, that is, when the two-step lower position D is not provided, the escape mechanism using the upper elongated hole 34a is not required and may of course be omitted.

As explained above, according to the present invention, the valve operating body 20 acts like a balance, and the main (traveling) clutch lever 25 or the working (planting) clutch lever 26 is rotated by a predetermined amount to move the aircraft up and down. When operated,
The main (travel) clutch lever 25 is either forcibly removed from the aircraft's elevating position or restricted from being able to move to the aircraft's elevating or lowering position.
Although the operation (planting) clutch lever 26 is connected to the hydraulic switching valve 17 to facilitate operation, it is possible to reliably prevent erroneous operation.

In addition, the aircraft height detection mechanism 6, 29, 30, 31
A link 34 having escape mechanisms 34a and 34b that allows movement by a predetermined amount of play is interposed between the valve operating body 20 and the valve operation body 20, and an escape spring 35 is installed that biases the escape mechanism so that the amount of play is eliminated. Therefore, the main (traveling) clutch lever 25 and the work (planting) clutch lever 26 are used not only for operating the main clutch and the work clutch but also for lifting and lowering, so even though the operation tends to be heavy, the operation is light. can do.

[Brief explanation of the drawing]

Figure 1 is a side view showing a rice transplanter to which the present invention can be applied, Figure 2 is a partial side view showing its main parts, Figure 3 is an enlarged partial side view showing its main parts, and Figure 4 is its A rear view, FIG. 5 is a perspective view showing the continuous traction device,
Fig. 6 is an exploded perspective view showing the arm constituting the aircraft height detection device, Fig. 7 is a view showing the hydraulic cylinder, Fig. 8 is a perspective view showing the main clutch lever and planting clutch lever, and Fig. 9 is a perspective view showing the arm constituting the aircraft height detection device. It is a side view showing a planting clutch lever. 1... Rice transplanter, 5... Body, 13... (chain) case, 15... Paddy wheel, 16... Hydraulic cylinder, 17... Switching valve, 20... Valve operating body, 20a, 20b... Play Mechanism (long hole),
25...Main clutch lever, 26...Work (planting) clutch lever, 6, 29, 30, 31...
Aircraft height detection mechanism, 33...Return spring, 3
4...Link, 34a, 34b...Escape mechanism (elongated hole), 35...Escape spring.

Claims (1)

[Scope of Claim for Utility Model Registration] Paddy wheels are provided on a case that is swingably supported by the aircraft body, the case is further connected to a hydraulic cylinder, and an aircraft height detection mechanism is connected to the switching valve of the hydraulic cylinder. In this rice transplanter, a machine body height detection mechanism is connected to a rotatable valve operating body connected to the switching valve, and a free space is provided on the opposite side of the rotation center of the valve operating body. The main clutch lever and the working clutch lever are connected through a mechanism, and the main clutch lever is controlled to descend by rotating in the operating direction from the engaged position to the disengaged position, and the work clutch lever is also moved from the engaged position to the disengaged position. A return spring is provided to control the aircraft upwardly by a rotational operation in the operating direction, and to apply pressure in the grounding direction to the aircraft height detection mechanism, and the aircraft height detection mechanism and the valve A rice transplanter body comprising a link having an escape mechanism that allows movement of a predetermined amount of play between the operating body and an escape spring that biases the escape mechanism so that the amount of play is eliminated. Height detection device.