JPH05316826A - Planting section-lifting mechanism of rice transplanter - Google Patents

Abstract

PURPOSE:To provide the subject mechanism formed so as to operate the spool of a hydraulic valve with two solenoids without greatly changing the constitution of the hydraulic valve for lifting the planting section of the rice transplanter. CONSTITUTION:A control lever 34 rotated by the feedback from a float 9 and one end of an operation arm 23 rotated by the lifting operation of a working lever 6 are brought into contact with the spool 22c of a hydraulic switch valve 22 for controlling the expansion or contraction of a hydraulic cylinder 13 for lifting a planting section C, and the operation arm 23 is formed so as to rotate the operation arm 23 to three positions with two push-pull solenoids 17X.17Y.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an elevating mechanism for elevating a planting section of a riding rice transplanter.

[0002]

2. Description of the Related Art Conventionally, a technique for raising and lowering a planting section of a rice transplanter has been known, and a raising and lowering mechanism for the planting section of the rice transplanter is
The lower link and the top link are arranged between the running part and the planting part of the rice transplanter, and the piston rod tip of the hydraulic cylinder is pivotally connected to the arm part at the front end of the top link to expand and contract the hydraulic cylinder. The planting part of the rice transplanter is moved up and down by the operation of the planting part raising / lowering operation of the rice planter by operating the work lever provided on the driver seat side of the rice transplanter to control the hydraulic cylinder. I was letting it.

[0003]

However, since the conventional raising / lowering operation unit is connected to the switching arm of the hydraulic pressure switching valve via the wire or link to the operating lever to perform the raising / lowering operation, the wire or link is required. There is a problem that a space for arranging is required, and the load during operation is large and the operability is poor.

[0004]

The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described. That is, in the planting part lifting mechanism of the rice transplanter,
The spool of the hydraulic switching valve that controls the expansion and contraction of the hydraulic cylinder that raises and lowers the planting part is brought into contact with the control lever that is rotated by being fed back from the float and one end of the operation arm that is rotated by the lifting operation of the work lever. The arm is configured to rotate to three positions by using two push-pull solenoids.

[0005]

The function of the present invention will be described. When the work lever 6 of the rice transplanter is rotated, the two push-pull solenoids 17X and 17Y provided in the hydraulic control unit are operated by the sensor provided at the ascending / descending rotation position, and the two push-pull solenoids 17X and 17Y provided in the hydraulic control unit are provided at the tip of the piston rod of the solenoid. Via the pivoting arm 19 over which the supporting pin 18 extends beyond the fulcrum
21d pushes and pulls the connecting rod 21, and the push-pull operation of these two push-pull solenoids 17X and 17Y keeps the rotating arm 19 in three positions, so that the operating arm 23 connected to the connecting rod is The spool 2 of the hydraulic switching valve 22 is rotated to three positions by the operation.
2a can be pushed to feed a hydraulic cylinder to expand and contract, and the planting section C of the rice transplanter can be moved up and down.

[0006]

The problems to be solved and the means for solving the problems of the present invention are as described above. Next, the concrete constitution of the present invention will be explained with reference to the accompanying drawings. 1 is an overall side view of the rice transplanter, FIG. 2 is a side view of a hydraulic switching valve operating portion, FIG. 3 is a side view of a push-pull solenoid, FIG. 4 is a front sectional view of the same, and FIG. FIG. 6 is a plan view showing the state where FIG.
7 is a plan view in the same neutral position, and FIG. 8 is a neutral position.
FIG. 6 is a cross-sectional view in which the lowered position and the raised position are arranged in contrast.

The overall structure of the rice transplanter will be described with reference to FIG. In the traveling section A of the rice transplanter, the engine is placed on the front part of the body frame 1, the engine is covered with the bonnet 2, and the handle 3 is projected on the rear part of the bonnet 2,
A driver's seat 4 is provided on the rear part of the body frame 1, and the driver's seat 4
The main shift lever 5 is provided on one side of the and the work lever 6 is provided on the other side. Elevating link B at the rear end of the machine frame 1
The planting section C is connected via the planting section C, and the planting section C, the planting claw 8, the float 9, the marker 10, etc. are arranged in the planting section C.

The lifting link B is constructed such that the lower link 11 and the top link 12 are arranged substantially parallel between the running part A and the planting part C of the rice transplanter, and the front end of the top link 12 is Piston rod 1 of hydraulic cylinder 13 on arm
3A is pivotally connected, and the planting portion C is moved up and down by the expansion and contraction of the hydraulic cylinder 13.

In FIG. 2, the working lever 6 is an operating lever for moving the planting portion C up and down.
The lower end of the work lever 6 is pivotally supported by the shaft 30, and the sensors S1 and S2 are respectively located at the raised position, the neutral position, and the lowered position of the work lever 6.
S3 is provided and connected to the drive circuit of the push-pull solenoid 17 described later. However, it is also possible to configure to operate by pressing a switch.
A connecting arm 31 is pivotally supported on the shaft 30, a feedback wire 32 from a float and a connecting rod 33 are connected to the connecting arm 31, and the other end of the connecting rod 33 is pivoted on the upper end of a control lever 34. The central portion is fixed to the boss 35, the lower end is coupled to the spring 26, and the boss 35 is pivotally supported by the shaft 25. The operation arm 23 is fixed to the boss 35, the upper end of the operation arm 23 is in contact with the spool 22a of the hydraulic pressure switching valve 22, and the lower end is pivotally connected to the tip of the rod portion 21b of the connecting rod 21.

The other end of the connecting rod 21 is U-shaped to form a connecting portion 21a, which is connected to the tips of the piston rods 17a and 17a of the two push-pull solenoids 17X and 17Y. As shown in FIG. 4, push-pull solenoids 17X and 17Y are fixed to the fixed support plate 15 in parallel with the bolts 16 in the horizontal direction.
Piston rod 17a of each push-pull solenoid 17
A support pin 18 is fixedly provided at the tip of the support pin 1.
8 is inserted into the long holes 21c and 21d penetrating the long hole of the rotating arm 19 and opening in the connecting portion 21a of the connecting rod 21, and the upper portion of the rotating arm 19 is pivotally supported by the fixed support plate 15. A pin 28 is fixed to the support shaft 20, and a pin 28 is projectingly provided at the lower end of the rotary arm 19.
5, a pin 29 is provided so as to project, and a fulcrum crossing spring 24 is interposed between the pins 28 and 29.

Then, the push-pull solenoid 17
In the push position and the pull position of the rotary arm 19, the pivot arm 2
In order to maintain the position beyond the fulcrum of 0, the spring 24
Is being urged by. Further, the connecting rod 21
The left and right long holes 21c and 21d opened in the connecting portion 21a of the piston are offset from each other in the expansion and contraction direction of the piston rod 17a. As shown in FIG. The neutral position N and the lowered position D can be maintained.

That is, referring to FIG. 8, when raising the planting portion C, when the work lever 6 is operated and pulled forward, the sensor S1 is turned on, and the push-pull solenoid 17X is turned on as shown in FIG. When both 17Y are contracted (pulled), the support pin 18X is located on the right side 21 of the elongated hole 21c of the connecting rod 21.
c "and pulling, the pivot arm 19 pivots beyond the fulcrum from the neutral or lowered position, except for 18Y
The rotating arm 19 on the side also goes beyond the fulcrum, and the connecting rod 21
Is kept in the raised position U, and the operation arm 23 moves the spool 2
2a is pressed to switch the hydraulic switching valve 22 to reduce the hydraulic cylinder 13 and raise the planting portion C.

When the work lever 6 is pushed to move it to the lowered position, the sensor S3 is turned on and, as shown in FIG.
When the push-pull solenoids 17X and 17Y are both extended, the support pin 18Y is formed into a long hole 2 of the U-shaped connecting rod 21.
The rotation arm 19 is pressed by abutting against the left side 21d 'of 1d.
Is above the fulcrum (the turning arm 19 on the 18Y side also exceeds the fulcrum) and is maintained at the lowered position D, the operating arm 23 is rotated and the spool 22a is pulled, and the hydraulic pressure switching valve 2
2 to switch the hydraulic cylinder 13 to extend the planting section C
Is lowered.

Next, when the work lever 6 is operated to the neutral position, the sensor S2 is turned on, the push-pull solenoid 17X is extended and the push-pull solenoid 17Y is contracted, and the support pin 18X is moved, as shown in FIG. Long hole 21
21c 'on the left side of c is pushed, and the support pin 18Y has a long hole 21d.
By pulling the right side 21d "of the connecting rod 21 substantially midway between the ascending position and the descending position.
Is maintained at a vertical position N from the pivot shaft 20 and the operating arm 23 is rotated to slide the spool 22a to switch the hydraulic switching valve 22 to the neutral position.
The piston rod 13a of the hydraulic cylinder 13 is maintained at that position, and the planting part C can be stopped at an arbitrary height. However, if the push-pull solenoid 17X pulls and the push-pull solenoid 17Y pushes, it is moved to the strong force of one of the solenoids, or the spring beyond the point is pulled, and if there is no force to exceed, the previous state Since it is maintained, it becomes unstable and should not be used in this case. Since the fulcrum traverse spring is used in this way, the position is maintained in the raised position and the lowered position without energizing the solenoid, and one push-pull solenoid is used to urge the spring to the neutral position. hand,
It can be configured to save power rather than push and pull to switch.

[0015]

Since the present invention is configured as described above, it has the following effects. That is, the hydraulic valve that has been conventionally used to raise and lower the planting part of the rice transplanter is hardly changed, and the solenoid that is linked to the hydraulic valve is used to electrically raise and lower the planting part. It became possible to control, and it became easy to perform lifting control related to other controls such as operating the work lever part, raising it when moving backward, and avoiding danger.

[Brief description of drawings]

FIG. 1 is an overall side view of a rice transplanter.

FIG. 2 is an overall side view of a rice transplanter.

FIG. 3 is a side view of a push-pull solenoid.

FIG. 4 is a front sectional view of the same.

FIG. 5 is a plan view showing a state in which the push-pull solenoid is in the raised position.

FIG. 6 is a plan view similarly showing a lowered position.

FIG. 7 is a plan view of the same neutral position.

FIG. 8 is a cross-sectional view in which the neutral position, the lowered position, and the raised position are arranged in contrast with each other.

[Explanation of symbols]

 B Lifting link part C Planting part 13 Hydraulic cylinder 13a Piston rod 17X / 17Y Push pull solenoid 17a Piston rod 18 Support pin 19 Rotating arm 21 U-shaped connecting rod 21a Connecting part 21b Rod part 21c / 21d Long hole 22 Hydraulic pressure Switching valve 24 Support point spring 34 Control lever

Claims (1)

[Claims] 1. A raising / lowering mechanism for a planting section of a rice transplanter, wherein a control lever and a working lever which are rotated by being fed back from a float are rotated to a spool of a hydraulic switching valve which controls expansion and contraction of a hydraulic cylinder for raising and lowering the planting section. A planting part raising / lowering mechanism of a rice transplanter, characterized in that one end of an operation arm that is rotated by operation is brought into contact with the operation arm and the operation arm is rotated to three positions by using two push-pull solenoids.