KR850003196Y1 - Hydraulic control machinery of a rice from splanter - Google Patents

Abstract

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Description

Hydraulic control mechanism of rice transplanter

The drawings illustrate the embodiment of the hydraulic control mechanism of the rice transplanter according to the present invention,

1 is an overall side view of a rice transplanter.

2 is a block diagram of a device for raising and lowering the control device.

3 is a side view of the control valve.

4 is a plan view of the control valve.

5 is a cross-sectional view taken along the line V-V in FIG.

6 is an enlarged view of the main part.

The present invention raises and lowers the driving device by stopping the hydraulic supply, oil discharge and oil supply and discharge to the single-acting hydraulic cylinder controlled by the spoof three-position control valve. In addition, the switching control operation based on the vertical motion detection of the sensor float installed in the device for collecting the sprue of the control valve, the planting is related to the hydraulic control device of the rice transplanter configured to maintain a stable level to the ground of the device.

In the hydraulic control mechanism described above, the sprue of the control valve is moved between the neutral position and the up and down positions due to the variation of the sensor float. Therefore, the control operation can be performed when the sensor float is not significantly displaced. In addition, since the time to feed back the lifting displacement of the apparatus to the sensor float was large, it was easy to generate oversupply of the hydraulic cylinder, and it was difficult to control the lifting and lowering of the seeding portion small and smoothly.

The present invention aims to solve such a problem.

Next, an embodiment of the present invention will be described with reference to the accompanying drawings.

1 shows a passenger-type rice transplanter, which is used to carry out a device lifting control using a hydraulic control device of the present invention, and has four parallel linkages (2) parallel to the rear of the traveling vehicle body (1). The linkage device 2, which is connected to the lifting and lowering device 3 freely, is operated to be extended by a hydraulic supply, and is contracted by a discharge of oil. It is configured to swing up and down by).

Then, the sprue-type three-position switching control valve 5 that manages the operation of the hydraulic cylinder 4, connected to the sensor float 6 installed in the apparatus 3, which acts on the sensor float 6 On the basis of the change in the ground pressure, the control valve 5 is switched to raise and lower the device 3 so that the grounding pressure of the sensor float 6 is maintained to be constant. It is configured to perform control to stabilize the level.

2 shows a specific structure of the control mechanism as described above, wherein the front and rear parts of the sensor float 6 are freely swinged up and down about the rear point X, and the fixing member 7 of the device 3 is collected. And the wires are connected as the refraction links 8 and 8, and the release wire 9 is operated in accordance with the refraction and extension of the refraction links 8 and 8, and the control valve 5 as the inner wire 9a. ) Is configured to swing by switching the operation arm 23).

That is, if the ground pressure of the sensor float 6 and the pressure of the spring 10 installed to operate the elastic force so that the yielding links 8 and 8 extend, the control valve 5 is in a neutral state and the hydraulic cylinder (4) is stopped so that the level with respect to the ground of the device 3 is kept constant.

In addition, when the traveling body 1 enters a place with a deep paddy field and the level of the ground of the device 3 is lowered, the ground pressure of the sensor float 6 becomes high, and the refractive links 8 and 8 become springs ( 10 is refracted, the loosening wire 9 is loosened so that the operating arm 23 is operated by the spring 24, the control valve 5 is switched to the hydraulic supply state, and the planting device 3 is As the hydraulic cylinder 4 is raised and the sensor float ground pressure is lowered to the set value, the neutral state is restored.

In addition, when the paddy surface becomes shallow and the vehicle body 1 sinks low and the level of the ground of the device 3 to be raised becomes high, the ground pressure of the sensor float 6 is lowered, so that the articulation links 8 and 8 spring. Stretched by the pressure and float weight of (10), the release wire (9) is tensioned, the operating arm (23) resists the spring (24) and swings so that the control valve (5) discharges oil from the cylinder The seeding device is lowered to its own weight until it is increased to a set value without grounding the sensor float and is stabilized in a neutral state. By carrying out such a control continuously, regardless of the amount of settling of the vehicle body 1, the seedling can keep the level with respect to the ground of the apparatus 3 substantially constant.

3 to 6 show the detailed structure of the control valve 5 described above, in which the tip of the sprue 12 inserted into the valve casing 11 is intruded into the operation casing 13. The pin 14 attached to the two ends of the sprue 12 is engaged as the operation fork 15 supported by the operation casing 13, and the fork shaft 16 connected to the above-described release wire 9 is fixed. By rotating positive or reverse, the sprue 12 is configured to be switched to the neutral position N, the rising position U, and the lowering position D. As shown in FIG.

17 in the figure is an arm for manually switching the sprue 12, and is attached to the case outer edge of the cylindrical shaft 18 fitted to the outside of the fork side 16 described above. The manual operation lever 25 is operated to swing the arm 17 attached to the inner edge of the case of the cylinder shaft 18, and the pin 14 of the sprue 12 is pressed on one side and the hydraulic pressure is supplied. It is possible to forcibly shift to the rising position U. The arm 17 is held at a position largely escaped from the pin 14, as indicated by the imaginary line in the figure, thereby allowing forward or reverse operation of the spool by the fork 15, i.e., automatic elevating control. The arm 17 is supported by the pin 14 of the sprue 12 in the neutral position N, and the arm 17 is held as the spring bowl 22. As a result, the hydraulic cylinder 4 can be fixed at an arbitrary position, and as the arm 17, the sprue 12 is forcibly shifted to the ascending position U, which is the hydraulic pressure supply position, by means of the arm 17. It is to be able to raise by force.

Next, the function of the valve 5 itself will be described in detail.

When the sprue 12 is in the neutral position N as shown, the first drain oil chamber communicating with the oil chamber a and the drain port T communicating with the pump pot p is shown. (b) is communicated through the small diameter portion 12a of the sprue 12, and the hydraulic pressure is leaked directly, and the oil chamber c communicating with the cylinder port C is closed at the large diameter portion 12b. And the hydraulic cylinder 4 is locked.

When the sprue 12 is pushed in and is switched to the raised position D, the first drain oil chamber b is closed at the large diameter portion 12c, and the pump pot oil chamber a and the cylinder pot oil chamber c are ) Is communicated via the small diameter portion 12a, and the hydraulic pressure is sent to the cylinder port (C).

When the sprue 12 is pulled out and switched to the lowered position D, the cylinder oil chamber c and the second drain oil chamber d communicate with each other via the second small diameter portion 12d, and the hydraulic cylinder Oil discharge from (4) becomes possible, and the pump pot oil chamber (a) and the first drain oil chamber (b) remain in communication with each other and are short-circuited to discharge oil.

19 is a main relief valve in communication with the pump port p, and 20 is a device for collecting oil from leakage by preventing oil discharge from the cylinder 4. It is a valve for the lowering lock that prevents the unexpected lowering of the car and is normally open and shut off when driving on the road.

Reference numeral 21 denotes a throttle valve provided in the cylinder oil discharge, and the seedling is used to adjust the lowering speed of the device 3 to its own weight. The configuration described above is not particularly changed from the conventional one, and the following configuration is added again in the present invention.

That is, the underlap part A is formed in the tip part of the pump pot oil chamber a side of the large grub 12b of the sprue 12 mentioned above.

The underlap portion A has a parallel end portion (a radius of about 0.1 mm) that is slightly smaller than the outer diameter of the large diameter portion 12b over a small range l (about 1 mm) that has been transmitted in the direction of the spun axis. It is comprised as a back part.

According to the above configuration, when the underlap portion A is caught by the end of the cylinder pot oil chamber c as shown in Fig. 6, the oil chamber c is a small gap e of the underlap portion A. Is connected to the pump pot oil chamber (a) via a gap of about 0.1 mm, and the pump pot oil chamber (a) itself has a small gap (f) in the first drain pot oil chamber (b). When the amount of overlap between the underlap part A and the oil chamber c is small, the small stationary f described above becomes relatively large, resulting in a small drain resistance, and a small amount of oil from the hydraulic cylinder 4. As the discharge is made possible, the seedlings have the low speed state of the apparatus 3.

In addition, when the amount of overlap between the underlap portion A and the oil chamber c increases, the small gap f, which is transmitted through a sieve having a constant size of the small gap e, becomes small and the drain resistance becomes large. The back pressure due to the resistance and the hydraulic cylinder internal pressure are parallel to each other, whereby a stable state in which the hydraulic cylinder 4 is substantially stopped is maintained.

Therefore, between the original neutral position (N) of the sprue 12 and the rising position (U), which is the hydraulic supply position, a low-speed lowering position (D ') by oil discharge via an underlap portion (A) is formed. The neutral stable position N 'is formed between the low speed falling position D' and the original rising position U by the supply and discharge hydraulic equilibrium, and these three positions U and N ' ), (D ') enables automatic control by spun sheet.

In addition, since the amount of shift of the sprue 12 is small, the feedback time is also shortened, and the control with high responsiveness and stability is smoothly performed.

Alternatively, when the unevenness of the paddy surface is severe, the original lowering position D is also used, but at this time, since oversupply occurs, the lowering position U is once switched to the rising position U, and then the rising control is performed. It is stabilized at the neutral stable position (N ') using A).

In the same way, when the device 3 is lowered by using the lowered position D, the seedlings which are raised by manual operation are similarly oversupplied and then reached the neutral stable position N '.

In addition, the present invention can be used for a walking type rice transplanter which stabilizes the level and attitude of the ground of the device, which is integrated with the body by the lift control of the wheel.

As described above in detail as an embodiment of the present invention, in the hydraulic control mechanism of the rice transplanter described in the opening paragraph, a constant small range of the neutral position and the center of the sprue of the control valve described above is the intermediate position with the long body rising position. The underlap portion which acts in the form of an underwrap is formed, and in the range of the underlap portion, the seeding by the small cylinder oil discharge is configured such that the device lowered state and the neutral stable state due to the equilibrium of hydraulic supply and discharge appear. As a result, the lifting and neutral stability control operation can be performed in the small stroke range under which the underlap part works, and the control device can be lifted small and smoothly for the small displacement of the sensor float, so that the control without high overshoot is maintained. It became possible to do.

Furthermore, since the control by the original three-position switching is also possible, the level of the ground of the seedling device can be stabilized quickly by performing the lifting control as usual even for a large displacement of the sensor float.

Claims (1)

Lifting operation and fixation of the device 3 being driven by blocking the hydraulic supply, oil discharge and oil supply and discharge to the single-acting hydraulic cylinder 4 controlled by the spoof three-position control valve 5. In addition, the switching operation is performed on the basis of the vertical motion detection of the sensor float 6 installed in the apparatus 3 for collecting the sprue 12 of the control valve 5, and the planting level is adjusted to the ground level of the apparatus 3. In the hydraulic control mechanism of the rice transplanter configured to be stably held, in the sprue 12 of the control valve 5 described above, the constant small range of the intermediate position between the neutral position N and the rising position U of the device to be planted is constant. The underlap part A which functions in (l) is formed, and in the range of the action of this underlap part A, the seeding by the small amount of cylinder oil discharge is neutral safety by the equilibrium of the apparatus descending state and the hydraulic supply and discharge | emission. Specially configured to show status Hydraulic control device according to a rice transplanter.