JP2508831Y2 - Rice transplanter hydraulic control device - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial field of application The present invention relates to a hydraulic control device of a rice transplanter, and more specifically, it detects the position of an operating part with respect to a rice field by a sensor and automatically switches hydraulic valves. The present invention relates to a hydraulic control device that controls the position of a working unit.

(B) Conventional technology Generally, the position of a working unit such as a planting unit for planting seedlings in a rice transplanter is detected by a sensor such as a float, and the hydraulic valve is automatically switched based on the detection signal to determine the working unit. I try to maintain it at a fixed position with respect to the rice field.
In this case, depending on the condition of the field, the float may sink and push mud, or the front may run loosely above the rice field, so the float should run with a certain amount of sinking and in the correct posture. There is provided a mechanism for manually adjusting the automatic switching sensitivity of the hydraulic valve based on the above signal.

On the other hand, when moving the rice transplanter or when inspecting the working unit, it is necessary to raise and fix the working unit described above. Therefore, as a mechanism for locking the hydraulic valve of the hydraulic control device, the working unit is fixed. There is a device that locks the operating levers for raising, lowering, and fixing in the fixed position.

(C) Problems to be solved by the invention By the way, the hydraulic valve is configured to open / close the pressure oil discharge from the hydraulic pump and send it to the actuator to control the position of the working part. Therefore, when the engine speed is increased to increase the traveling speed, the traveling speed increases and the pressure oil discharge amount also increases. When attempting to control the position of the working part by a large amount, a large amount of pressure oil is supplied even for a short valve opening time, and as a result, the working part is rapidly raised and lowered, and the position control accuracy decreases. May cause hunting.

In addition, the mechanism that locks the hydraulic valve at the fixed position with the operation lever when the working unit is fixed in the raised state and the rice transplanter is moved or the working unit is inspected,
Since various interlocking members are interposed between the operation lever and the hydraulic valve, there is play, and it is difficult to completely lock the hydraulic valve at a predetermined position, and the working unit may move up and down.

Therefore, an object of the present invention is to provide a hydraulic control device having a lock mechanism that changes the automatic switching sensitivity of the hydraulic valve according to the pressure oil discharge amount and that can surely lock the hydraulic valve when it is locked. It is a thing.

(D) Means for Solving the Problems The present invention has been made in view of the above circumstances, and includes a hydraulic valve (31) for supplying and discharging hydraulic pressure to and from a working unit lifting hydraulic actuator (19). 40) and a hydraulic control device for a rice transplanter that performs switching operation based on a sensor (14) that detects the position of the working unit (10) with respect to the rice field and controls the working unit to move up and down. An operating member (30) connected to the operating member (30), an interchange mechanism (30c) interposed between a connecting mechanism of the operating member and the operating lever (40), the sensor (14) and the operating member (30). The sensor is arranged between the coupling mechanism (30c) and adjusts the coupling position (28) between the sensor and the actuating member according to the increase / decrease in the hydraulic pressure projection amount supplied to the hydraulic valve (31). Adjusting means (27, 28) for adjusting the sensitivity of the hydraulic valve, A lock mechanism (50) capable of fixing the operating member at the fixed position of the hydraulic valve (31), and the adjustment based on the increase / decrease change in the hydraulic discharge amount regardless of the fixing of the operating member by the lock mechanism. It is characterized by comprising a relief mechanism (25, 26) for permitting movement of the means.

Also, a lock mechanism (50) that locks the operating member (30).
A pin (51) fixed to the actuating member (30) by protruding.
And a lock member (52) for locking the pin (51), and the notch between the pin (51) of the lock member (52) and the entrance (52b) of the engaging portion is wide angled to the back side. Straight part (5
It is characterized by the provision of 2c).

(E) Operation Based on the above configuration, the position of the working part (10) with respect to the rice field is detected by the sensor (14), and the automatic switching operation of the hydraulic valve (31) is performed to control the position of the working part (10). When it is necessary to change the sensitivity of the automatic switching operation of the hydraulic valve (31) when the sensor (14) plunges into the mud or floats on the rice field depending on the condition of the field, the interlocking mechanism (20 ) So that the sensor (14) is in the proper position. Further, when the amount of pressure oil discharged to the hydraulic valve (31) changes, the sensitivity of the automatic switching operation of the hydraulic valve (31) automatically changes by the adjusting means (27, 28) connected to the interlocking mechanism (20). Hydraulic valves, for example (31)
When the discharge amount of pressure oil on the hydraulic valve increases, the hydraulic valve (31)
The sensitivity of the automatic switching operation of the valve (31) by the detection signal of the sensor (14) becomes slower so that the timing of opening the valve becomes late.

When the hydraulic valve (31) is locked, when the lock member (52) is engaged with the pin (51) provided on the operating member (30), the lock member (52) is engaged with the pin (51). Since the notch of the entrance (52b) of the section has a wide angle, it engages smoothly and the straight section (52c) provided on the back side
It is firmly locked in.

The reference numerals in parentheses refer to the drawings and do not limit the configuration in any way.

(F) Example Hereinafter, an example according to the present invention will be described with reference to the drawings.

As shown in FIG. 4, the riding rice transplanter 1 has a traveling machine body 5 supported by front wheels 2 and rear wheels 3, and an engine 6 is mounted on the traveling machine body 5 above the front wheels 2. In addition, a driver's seat 9 having a seat 7 is arranged in an intermediate portion between the front and rear wheels 2 and 3. Fertilizer tanks 13, 13 for paste-like or liquid fertilizers are installed on the left and right of the front part of the machine body 5, and are connected and connected to a fertilizer pump (not shown) provided in the rear part of the machine body 5. Further, a hydraulic cylinder 19 is extended rearward from the center of the machine body 5, a link 8 is connected to the hydraulic cylinder 19, and the planting portion 10 can be raised and lowered through the link 8. Supported by. Further, the planting section 10 includes a large number of planters 11, ...
A fertilizer application nozzle 15 and a seedling placing table 12 on which two mat seedlings can be placed vertically are provided. The fertilizer application nozzle 15 communicates with a pump (not shown) to apply the fertilizer in the fertilizer tank 13 to the field, and the seedling placed on the seedling stand 12 by the planter 11. Is planted in the rice field.

In this case, the position of the planting unit 10 which is the working unit of the rice transplanter 1 with respect to the rice field is such that the float 14 traveling while floating up and down the rice field.
Is controlled by the hydraulic control device based on the detection signal of.

Then, in order to drive the hydraulic control device for controlling the planting section 10 to move up and down and the planter 11 of the planting section 10 and the like, FIG.
As shown in FIG. 3, an operation lever 40 is provided upright on the side of the seat 7, and the operation of the operation lever 40 is ascending, fixing, automatic and planting from the right in FIG. When the lever 40 is operated from the automatic position to the raised position, the lever 40 automatically returns from the raised position to the fixed position (not shown)
Has become.

A cam plate 43 is fixed to the bottom of the operating lever 40, and the cam plate 43 is pivotally supported by a shaft 43a fixed to the machine body 5 and rotates around the shaft 43a in accordance with the operation of the operating lever 40. . Further, there are two members that operate by engaging with the cam plate 43, one is related to a hydraulic control device for raising and lowering the planting part 10, and the other is a planter 11 or the like of the planting part 10. It is related to driving.

There is a rectangular plate-shaped arm 41 as the former member, and a roller 42 that engages with the cam plate 43a is attached to a substantially central portion, and a shaft 41a provided at one end of the arm 41 serves as a spindle. It is configured to be rotatable. Also, the arm 41
A rod 44 extending downward is rotatably attached to the other end of the rod 44, and a substantially triangular arm plate 49 is rotatably attached to the other end of the rod 44. A spring 46 is attached to the center of the rod 44,
44 is biased downward.

On the other hand, as a member related to the drive of the planter 11 of the latter planting section 10, a substantially rectangular plate-shaped drive arm 45 is located near the lower part of the cam plate 43, and a wire is provided at one end thereof.
48 is attached, and the wire 48 is connected to a planting clutch 47 that connects and disconnects the power transmission from the engine 6 to the planting section 10.

On the other hand, the above-mentioned substantially triangular plate arm 49
The rod 44 is rotatably connected in the vicinity of one apex thereof, and a pin 49a is fixed in the vicinity of the other apex thereof so as to protrude toward the back surface in FIG. Further, a fixed shaft 49b is provided near the other apex, and when the rod 44 moves in the vertical direction, the plate arm 49 rotates the shaft.
The pin 49a moves substantially horizontally by rotating around 49b within a predetermined range.

The pin 49a is the accommodation mechanism 30 which is a rectangular hole provided in the operating member 30 connected to the hydraulic valve 31.
engaged with c. One of the actuating members 30 is a rectangular plate-shaped hydraulic plate 30a, in which the accommodation mechanism 30c is provided.
Is drilled, and the other is a rod-shaped hydraulic rod 30b. The tip of the hydraulic rod 30b is connected to a valve arm 32 projecting from the hydraulic valve 31, and the hydraulic valve 31 opens and closes when the valve arm 32 rotates. Further, in FIG. 1A, when the tip of the hydraulic lot 30b moves to the left, the oil passage of the hydraulic valve 31 opens and pressure oil from a hydraulic motor (not shown) is sent to the hydraulic cylinder 19. When the tip of the rod 30b reaches the intermediate fixed position, the valve 31 is closed and the oil in the hydraulic cylinder 19 is fixed, and when the tip of the rod 30b reaches the right descending position,
The valve 31 is opened so that the oil in the hydraulic cylinder 19 flows out. The hydraulic valve 31 is normally biased by the spring 33 so as to be in the lowered position.

Further, when the operation lever 40 is operated to the automatic position, the position of the planting part 10 from the rice field is controlled by the detection signal from the float 14. As shown in FIG. 1 (a) or FIG. 2, the structure is such that an elongated hole 25 is formed in the vicinity of the central portion of the hydraulic plate 30a, and is slidable in the left-right direction through the elongated hole 25. A shaft 28 is provided on the shaft. A spring 26 is attached to the rear end of the shaft 28 to urge the shaft 28a to the right. Further, a rectangular plate 23 is attached substantially vertically to the front end of the shaft 28, and a wire 27a as an adjusting means for changing the automatic switching sensitivity of the valve 31 depending on the increase and decrease of the pressure oil discharge amount. The tip is stuck. The other end of the wire 27a is connected to the accelerator rod 29 through a flexible wire tube 27b fixed to the tip of the hydraulic plate 30a and the vicinity of the accelerator rod 29, and when the accelerator rod 29 is rotated, the wire interlocks. Then, it is configured to be pushed.

On the other hand, a pin 23b is projected from the lower portion of the plate 23, and an arm 24 attached to the tip of a rod 35 for transmitting the movement of the float 14 is engaged with the pin 23b through a long hole 24a. There is. In addition, the shaft 23 is provided at the center of the plate 23.
a is provided, and the shaft 23a is provided adjacent to and is axially supported by one end of the plate 22. The plate 22 is axially supported on the machine body 5 by a shaft 22a in the vicinity of its center, and a float sensitivity adjusting lever 21 extending upward is attached to the upper end of the plate 22. Then, the lever 21, the plates 22 and 2
3, the long hole 25, the shaft 28, etc. constitute the interlocking mechanism 20 for adjusting the sensitivity of the automatic switching operation of the hydraulic valve 31.

On the other hand, the lock mechanism 50 of the hydraulic control device is, as shown in FIG. 1 (a), (b) or FIG.
Located between 20 and hydraulic valve 31, pin 51 and locking member
52 and the pin 51 is the hydraulic plate 30 of the operating member 30.
It is fixed to the upper part of the interchange mechanism 30c provided in a in the form of an L-shape projecting upward, and the lock member 52 for locking the pin 51 is attached to the frame 55 fixed to the machine body 5. ing. That is, as shown in FIG. 3, a mounting plate 56 having a long hole 56a on one side is adjustably fixed to a long hole 55a provided in the frame 55 with a screw 57.
The pin 51 projects from the long hole 56a of the mounting plate 56, and a lock member 52 for locking the pin 51 is rotatably mounted on one end of the mounting plate 56 with a screw 53. The lock member 52 has one end bent upward in an L shape to form a handle 52a, and the other end is rotatably attached to the attachment plate 56 by the screw 53 as described above. Further, the central portion of the lock member 52 is
Is provided with a notch so as to lock the pin 51 when is rotated, the notch has a wide-angled portion 52b at the entrance, and has a wide opening, and the back has a straight portion 52. It is about the diameter of the pin 51.

Since the present embodiment has the above-described configuration, in FIG. 1A, when the operation lever 40 is operated to the raised position, the cam plate 43 rotates to push up the roller 42 and the rod 44 via the arm 41. Is pulled up. Along with this, the arm plate 49 rotates counterclockwise about the shaft 49b, and the pin 49a fixed to the arm plate 49 moves the operating member 3
The actuating member 30 is moved to the left by contacting the left end of the interchange mechanism 30c, which is a rectangular hole provided in 0. As a result, the valve arm 32 rotates to open the hydraulic valve 31, pressure oil is sent to the hydraulic cylinder 19, the cylinder 19 extends, and the planting portion 10 rises.

When the operating lever 40 is operated from the raised position to the automatic position, the rod 44 descends and the arm plate 49 rotates clockwise around the shaft 49b, and the pin 49a of the plate 49 is rotated.
Moves to the right. The operating member 30 is a hydraulic valve.
Since the spring 33 attached to the valve arm 32 of 31 is biased to the right, the left end of the interchange mechanism 30c is pin 49a.
While moving in the right direction while contacting with, the oil passage of the hydraulic valve 31 opens so as to drain the oil of the hydraulic cylinder 19 and the cylinder 19
Contract and the planting part 10 descends. In this state, the planting unit 10
When the float 14 provided in the float moves up and down due to the state of the paddy field, the float sensing rod 35 attached to the floro 14 swings left and right together with the arm 24,
The plate 23, which engages with the pin 23b, rotates about the shaft 23a, and its upper portion swings left and right. An upper portion of the plate 23 is slidably engaged with a long hole 25 provided in a hydraulic plate 30a by a shaft 28. A wire 27a is attached to the shaft 28, and the wire 27a is an accelerator rod. Since the movement is restricted by 29, the shaft 28 does not slide in the elongated hole 25, and the hydraulic plate 30a integrally swings left and right. Therefore,
The operating member 30, which is integrally formed by the hydraulic plate 30a and the hydraulic rod 30b fixed to the plate 30a, swings left and right to control the hydraulic valve 31 to the up and down positions, and accordingly, the hydraulic cylinder. 19 expands and contracts and is automatically controlled so that the height above and below the ground is constant.

In this case, depending on the condition of the field, the float 14 may sink and push mud, or conversely, the float 14 may run uphill from the rice field, so the float 14 has a constant sinking amount, and in a correct posture. When the float sensitivity adjusting lever 21 is operated so as to run, the plate 22 rotates about the shaft 22a attached to the body frame, and the shaft 23a for the plate 23 provided near one end of the plate 22 moves to the left and right. Move to. Therefore, the long hole 24a provided in the arm 24 at the tip of the float sensing rod 35 and the pin 23b of the plate 23 are provided.
The engagement position with and changes, even at the same float 14 position, the response to the rising side becomes faster by operating the lever 21,
Or the response to the descending side becomes faster.

Also, the accelerator rod 29 that changes the rotation speed of the engine 6
When is rotated, the wire 27a connected to the accelerator rod 29 is pulled, and the shaft 28 to which the tip of the wire 27a is attached moves in the long hole 25 provided in the hydraulic plate 30a. Therefore, the plate 23 rotates left and right about the shaft 23a, the engagement position between the long hole 24a provided in the arm 24 and the pin 23a of the plate 23 changes, and it is as if the float sensitivity adjusting lever 21 is operated. It acts as if it were done.
That is, when the accelerator rod 29 is rotated to increase the engine speed, the wire 27a is pulled and the shaft 28 moves to the left in the long hole 25 of the hydraulic plate 30a, so that the hydraulic plate 30a from the float 14 is moved to the left. To move to, ie hydraulic valve 31
Open to open and send pressure oil to the hydraulic cylinder 19 to raise it,
Becomes insensitive. As a result, even if the rotation speed of the hydraulic pump increases and the pressure oil discharge amount increases as the rotation speed of the engine 6 increases, the opening time of the hydraulic valve 31 is controlled according to the pressure oil discharge amount. There is no possibility that the attachment part 10 is suddenly controlled to move up and down to cause a hunting phenomenon. Depending on the working unit, the control may be reversed.

Further, when it is desired to fix the planting portion at a predetermined position, first, when the operation lever 40 is operated to the fixed position, the operating member 30 moves and the hydraulic valve 31 becomes the fixed position, so that the hydraulic oil in the hydraulic cylinder 19 is moved. Is blocked and the planting part 10 stops at a predetermined position. In this case, the pin 5 provided on the hydraulic plate 30a
As shown in FIG. 3, the reference numeral 1 is located substantially at the center of the elongated hole 56a of the mounting plate 56. Then, hold the lock member 52 by the handle 52a and set the screw 5
When it is rotated clockwise about 3 as a fulcrum, the pin 51 is guided by the wide-angle portion 52b at the entrance and locked by the straight portion 52c provided on the back side. In this way, since the inlet of the lock member 51 is widened and the straight portion 52c is provided on the back side for completely locking, the pin 51 can be easily called in, and the straight portion 52c allows the pin 51 of the hydraulic plate 30a to be inserted. Since it is restrained at right angles to the operating direction of the plate 30a, locking can be performed reliably, and there is no risk of locking the hydraulic valve 31 at a position other than the fixed position of the hydraulic valve 31.

Further, even when the operating member 30 is locked by the lock mechanism 50, the shaft 28 can move in the long hole 25 against or in accordance with the spring 26, and the accelerator rod 29 is moved to move the engine speed. Is allowed to be adjusted.

(G) Effect of the Invention As described above, according to the present invention, based on the increase / decrease of the hydraulic discharge amount supplied to the hydraulic valve (31), the connecting position () between the sensor (14) and the operating member (30) 28) is adjusted to adjust the sensitivity of the hydraulic valve by the sensor, so that there is no possibility of hunting phenomenon due to abrupt raising / lowering control of the working unit (10) which occurs when the discharge amount is large as in the conventional case.

Further, since the operating mechanism (32) of the hydraulic valve (31) is provided with the lock mechanism (50) capable of locking the operating member at the fixed position of the hydraulic valve (31), the interchange mechanism (30c) or the like is provided. For those that lock the operation lever (40) that is connected to the actuating member via the hydraulic valve, the hydraulic valve can be directly locked in its fixed position, and the hydraulic valve can be locked reliably and accurately to improve safety. can do.

Further, regardless of the locking of the actuating member (30) by the lock mechanism (50), the relief mechanism (25, 26) adjusts means (27) based on the increase / decrease in the hydraulic discharge amount by the accelerator rod (29) or the like. , 28) is allowed, the operation such as the accelerator operation accompanied by the change of the hydraulic discharge amount can be performed without any trouble even in the locked state.

Further, the lock mechanism (50) is composed of a pin (51) fixed to the actuating member (30) and a lock member (52), and a notch at the entrance of an engaging portion with the pin (51) of the lock member (52). Wide angle (52
Since it is set to b), the actuating member (30) does not easily bend and the straight portion (52c) is provided on the back side, so that the hydraulic valve (via the pin (51) and the actuating member (30) ( 31) can be accurately and surely held in a fixed position, and the locked pin (51) can be securely locked without coming off, and safety can be ensured at the time of maintenance of the machine.

[Brief description of drawings]

FIG. 1 (a) is a side view of a hydraulic control device according to the present invention, FIG. 1 (b) is a plan view of the hydraulic control device, and FIG. 2 is a perspective view of essential parts of the hydraulic control device. FIG. 3 is a plan view showing the lock mechanism, and FIG. 4 is a side view of the rice transplanter. 10 …… Working part (planting part), 14 …… Sensor (float),
25,26 …… Escape mechanism (long hole, spring), 27,28 …… Preparation means (wire, shaft), 28 …… Coupling position (shaft), 30 …… Actuating member, 30c …… Interchange mechanism, 31… … Hydraulic valve, 32 …… Operating part (valve arm), 50 …… Lock mechanism, 51 …… Pin,
52 …… Lock member, 52b …… Inlet (wide angle part), 52c …… Straight part.

Claims (2)

(57) [Scope of utility model registration request] 1. A rice transplanter for controlling the lifting and lowering of a working unit by switching a hydraulic valve for supplying and discharging a hydraulic pressure to and from a working unit lifting hydraulic actuator based on an operating lever and a sensor for detecting a position of the working unit with respect to a rice field. In the hydraulic control device, the operating member connected to the operating portion of the hydraulic valve, the interchange mechanism interposed between the connecting mechanism of the operating member and the operating lever, and the connecting mechanism of the sensor and the operating member. Intervenes between
Adjusting means for adjusting the connection position between the sensor and the operating member according to increase / decrease of the hydraulic discharge amount supplied to the hydraulic valve, and adjusting the sensitivity of the hydraulic valve by the sensor, and fixing the hydraulic valve. A lock mechanism capable of fixing the actuating member at a position, and a relief mechanism allowing movement of the adjusting means based on an increase / decrease change in the hydraulic discharge amount regardless of fixing the actuating member by the lock mechanism; A hydraulic control device for a rice transplanter, which is characterized by comprising: 2. A lock mechanism for locking the operating member,
A pin that is projectingly secured to the actuating member and a lock member that locks the pin are provided, and the notch of the lock member and the inlet of the engaging portion is wide angle to provide a straight portion on the back side. The hydraulic control device of the rice transplanter according to claim 1.