JPH07110175B2 - Fertilizer application in paddy field vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a fertilizer application device for a paddy field working vehicle such as a rice transplanter and a submerged soil seeder, and more specifically, supplies and stops fertilizer.
The present invention relates to the structure of a switching valve and a lock device for switching to cleaning and the like.

(B) Conventional Technology Conventionally, the rice transplanter 1 equipped with the paste fertilizer applicator has the fertilizer tanks 3, 3 on the left and right sides of the driver's seat 2 as shown in FIGS. 5 and 6.
No. 3 is provided and nozzles 9 are installed near each planter 6 of the planting section 5. And fertilizer tank
A pump device installed under the driver's seat from 3 and 3 through a suction hose 10 to communicate with a sub-tank 11 near the center of the traveling machine body, and from the sub-tank 11 through a number of hoses 12 in accordance with the number of planted rows. Guided by 13. And, the pump device 13 is a large number of flex rotor pumps according to the number of planted rows.
.. are arranged side by side in the longitudinal direction of the machine body, and these pumps are rotationally driven from the PTO drive shaft 15 via a power transmission device 16 such as a belt. Further, the outlets of the rotor pumps 13a are connected to the indicators 20 installed next to the driver's seat 2 via the hoses 19 and to the upper portion of the indicators 20, that is, the inflow portion from the hose 19. Is provided with a switching valve 18, and is led from each indicator 20 through the hoses 21 to the nozzles 9 in the vicinity of the planter 6.

Then, as shown in Japanese Utility Model Laid-Open No. 58-16012, the switching valve 18 uses the indicator 20 for the fertilizer from the pump device.
It is possible to switch to a supply (fertilizer) position for supplying (to the nozzle), a stop position for returning fertilizer from the pump device to the fertilizer tank, and a cleaning position for communicating the fertilizer tank in the nozzle direction.

Based on the above configuration, when the pump 13 is driven in association with the planting work, the paste (or liquid) fertilizer in the fertilizer tank 3 is supplied to the sub tank 11 via the hose 10, and a large number of the sub tank 11 is further supplied. Of the respective pumps, which are sucked into the respective rotor pumps 13, and further discharged from the discharge ports of the respective pumps to the indicators 20 via the respective hose 19 and the switching valve 18. As a result, the driver in the driver's seat 2 can confirm the flow of each hose by the indicator 20, and each indicator 20 guides the nozzle 9 through the hose 21 to the vicinity of the planted seedling by the planter 6. The fertilizer is applied in the form of streaks along the line.

Further, when the rice transplanter 1 reaches the end of the field and the planting work of a predetermined row is stopped, the switching valve 18 is switched to the stop position,
The supply of fertilizer to the nozzle 9 at the line stopping portion is stopped.

Further, at the end of use of the rice transplanter 1, the operator switches the switching valve 18 to the cleaning position, disconnects the hose 19 on the side communicating with the fertilizer tank side, press-fits tap water or the like from the hose 19, and thereby the nozzle Flush the fertilizer in the conduit to 9 and the indicator 20.

(C) Problems to be Solved by the Invention By the way, the switching valve 18 in the conventional fertilizer application apparatus
Since there is no stopper device and it can rotate freely, for example, the place where it should be in the stop position may be switched to the cleaning position by mistake operation.In this case, the fertilizer from the pump device is returned to the tank and part It is supplied to the nozzle, so it will be applied to places where it should not be applied.
For example, in the planting operation of the next step, if fertilization is applied to the fertilized portion at the same time as planting, double fertilization results. Also, when replenishing seedlings from the auxiliary seedling stand to the seedling stand, the operator's body may touch and switch the switching valve 18 from the supply position to the cleaning position. The amount of fertilizer applied is greatly reduced due to the diversion to the soil, and in any case, the growth of crops becomes uneven.

(D) Means for Solving the Problem The present invention is intended to solve the above-mentioned problems, and for example, referring to FIG. 1, the switching valve 38 includes the engaging portion 62a. And a feed position A for supplying fertilizer from the pump device (ie hose 41) in the nozzle direction (43), a stop position B for stopping the supply and returning fertilizer in the fertilizer tank direction (ie return pipe 63), and a fertilizer tank It is configured so that it can switch to the cleaning position C communicating from the side 63 to the nozzle direction 43, and further restricts the switching valve 38 to the cleaning position C by contacting the engaging portion 62a and the restriction position. It is characterized in that a stopper device 68 is installed so as to be freely switchable to a restriction releasing position for releasing the.

(E) Operation Based on the above-mentioned configuration, the switching valve 38 in the working state
Is in the supply position A, and the bar member 66 of the stopper device 68 is in contact with the engaging portion 62a of the operation lever plate 62. Therefore, in this state, the pump device 40 (the third
Paste-like (or liquid) fertilizer from Figure) is supplied to nozzle 46 (Figure 3) through hoses 41 and 43.

Further, when the planting (or sowing) work of a predetermined row is stopped, the switching valve 38 corresponding to the row is switched to the stop position B. In this state, the fertilizer from the pump device 40 is returned to the fertilizer tank again through the hose 41 and the return pipe 63.

When the cleaning is completed after the work, the stopper device 68 is first rotated to the position of the chain line, and in this state, the switching valve
Rotate 38 to cleaning position C. In this state, the return pipe
63 is in communication with the hose 43 to the nozzle side. Therefore, when the tip of the return pipe 63 is removed and tap water is pressed in, the pipe 63, the switching valve 38, the hose 43 and the nozzle 46 are washed.

When the work vehicle is in the working state, the stopper device 68
Is in the solid line position, and the switching valve 38 is restricted from rotating to the cleaning position C with the plate engaging portion 62a thereof coming into contact with the bar member 66.

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

The passenger rice transplanter 21 has front wheels as shown in FIG. 3 and FIG.
The vehicle has a traveling body 25 supported by a rear wheel 22 and a rear wheel 23, and the traveling body 25 has an engine at a front portion of the front wheel 22.
26 is mounted, and a driver's seat 29 is arranged so that the seat 27 is located at an intermediate portion between the front and rear wheels 22, 23, that is, a center of gravity of the machine. Further, a link 28 is provided behind the traveling body 25.
The planting section 30 is supported by a planter so as to be able to move up and down, and the planting section 30 has a large number of planters 6 ...
A long seedling stand 31 that can be placed half and a half is provided.

Further, fertilizer tanks 32, 32 for paste-like or liquid fertilizers are installed on the left and right in front of the machine body 25, and the left and right tanks 3
A hose 36 communicates through the fuselage frame 35 so as to connect the two, and a suction hose 39 extends rearward from the hose 36 below the step surface 37 of the driver's seat 29. It communicates with a pump device 40 arranged below the step surface 37 in the seat 27 portion. Further, as shown in detail in FIG. 2, the fertilizer flow detection sensors 42 and 42, which are installed side by side in the lateral direction of the machine, from the pump device 40 through the hoses 41 ... It is guided to the switching valve 38 and then to the nozzle 46 near the planter 6 via each hose 43 and the preload valve 45 for preventing drifting. The pump device 40, the flow detection sensor 42, the switching valve 38, the preload valve 45, and the nozzle 46 are located below the fertilizer tank 32, and each of these components 3
2, 40, 42, 38, 45, 46 are arranged in a substantially straight line so as to be gradually lowered from the front to the rear of the machine body in accordance with the flow of fertilizer.

Then, the preload valve 45 is arranged adjacent to the upstream side of the nozzle 46, is attached to the float 47 integrally with the nozzle 46, to pass a fertilizer flow of a predetermined pressure or more to the nozzle 46 side,
A valve element, such as a relief valve or a safety valve, which is biased by a spring with a predetermined pressing force so as to block the flow of fertilizer below the predetermined pressure, is provided.

As shown in detail in FIG. 1, the flow detection sensor 42 includes a high pressure detection unit 42a and a low pressure detection unit 42b, and each of the detection units 42a and 42b is connected to a body 49 through which a fertilizer flow flows. The pressure detection holes 49a, 49b that are bored, the diaphragm 50 made of rubber or the like that is stretched so as to close the holes 49a, 49b, and the holes 50a, 51b are installed so as to overlap with the diaphragm 50.
Fixed electrode plate 51 opened, the lower end of the fixed electrode plate 51 is inserted into the holes 51a, 51b contact the diaphragm 50, and the upper end contacts movable electrode plates 52a, 52b contacting and separating from the electrode plate 51. Spacers 53a, 53b, pressure adjusting springs 55a, 55b for giving predetermined set pressing forces to the electrode plates 52a, 52b, respectively, and terminals electrically connected to the electrode plates 52a, 52b via the springs 55a, 55b. Screw members 56a, 56b, a terminal screw member 59 electrically connected to the electrode plate 51 via a spring 57, and the diaphragm 50 between the body 50 and the body 49, an electrode plate.
Holding 51, each component 52a, 52b, 53a, 53b, 55a, 55b,
It is composed of a cover member 60 configured to house or mount 56a, 56b, 57, 59.

Further, as shown in FIG. 1, the switching valve 38 is
A valve body 61 that can be inserted into and connected to the body 49 of the flow detection sensor 42 is provided, and the fertilizer flow from the sensor 42 side to the nozzle 46 direction or the return pipe 63 is provided inside the body 61 by rotating the operation lever 62. Through sub-tank 71 direction,
Furthermore, the return pipe 63 and the pipe 43 facing the nozzle 46.
It has a cock member 65 that rotates so as to communicate with each other, and an engaging stepped portion 62a is formed at a predetermined position on a plate integrated with each operation lever 62. Then, as shown in FIG. 2, the switching valves 38 and 3 arranged side by side in the width direction of the machine body.
A shaft 67 is rotatably supported by penetrating the valve body 61 of No. 8 and one end side (70a) is provided at both ends of the shaft 67.
The arm members 70a and 70b are fixed to the armature 7 and rotatably at the other end side (70b).
One end (70a) is rotatably supported and the other end (70b) is fixed to both ends of a and 70b, and the bar member 66 is connected. Further, springs 69a and 69b forming a toggle spring are stretched between the bar member 66 and the fixed portion, and these arm members and bar members are normally located at the positions shown by the solid line in FIG. The bar member 66 abuts on the engaging stepped portion 62a of the operation lever plate 62, and constitutes a stopper device 68 for restricting the switching valve 38 from rotating to the cleaning position C. Further, FIG. As shown by the dotted line, the arm members 70a, 70b are rotated to reverse the urging force of the springs 69a, 69b to the arm members 70a, 70b, so that the bar member 66
By releasing the engagement of the operation lever 62 with the engagement stepped portion 62a, the operation lever 62 can be turned in the A → C direction, and the switching valve 38 is moved to the return pipe 63 and the nozzle 46.
It is possible to switch to the cleaning position C where the pipe 43 facing the direction can be communicated.

The pump device 40 is composed of a large number of screw pumps according to the number of threads to be planted, and these screw pumps are annularly arranged on the same circumference with their suction sides facing the sub tank 71 (see FIGS. 3 and 4). ing.

Since the present embodiment is configured as described above, the paste-like or liquid fertilizer injected into the fertilizer tanks 32, 32 installed at the front of the fuselage is directed toward the hose 36 and the rear of the fuselage based on the head difference. It is supplied to the sub-tank 71 through a suction hose 39 that extends in a substantially straight line. Then, with the start of the planting work, the pump device 40 is driven, and each screw pump of the pump device 40 sucks the fertilizer in the sub-tank 71 and discharges it to each hose 41, and further linearly extends toward the rear of the machine. The pressure is fed to the flow detection sensor 42 and the switching valve 38 via the hose 41 extending to the. The fertilizer that has passed through the switching valve 38 at the supply position A of the operating lever 62 in FIG. 1 is hose 43 extending in the direction of each nozzle 46 so as to incline slightly backward and spread laterally. Then, the fertilizer is pressure-fed to the pre-compression valve 45 via the nozzles 46, and is further fertilized laterally on the seedlings planted by the planters 6 by the nozzles 46.

During normal fertilization work, the fertilizer pressure provided by the preload valve 45 causes the low pressure detection unit 42b of the flow detection sensor 42 to operate.
The diaphragm 50 is actuated upward against the spring 55b, thereby causing the electrode plate 5 to move through the spacer 53b.
2b is separated from the electrode plate 51, and is taken out, for example, via a terminal screw member 56a on the side of the high-voltage detector 42a that is in conduction with a terminal screw member 59 connected to the power source side via a lead wire (not shown). The normal fertilization state is displayed on the monitor unit 72 (see FIG. 3) arranged in front of the driver's seat 29 by the electric signal. Further, in the above operating state, when the fertilizer is clogged with the nozzle 46 or the like for some reason and the fertilizer stops flowing, the pressure in the pipe increases due to the stagnation of the fertilizer flow, and the pressure is set by the spring 55a. When the pressure becomes equal to or higher than a predetermined pressure, the electrode plate 52a is separated from the electrode plate 51 in the high pressure detection unit 42a of the flow detection sensor 42 similarly to the operation of the low pressure detection unit 42b, and in this case, from the high and low pressure detection units 42a and 42b. Since neither electric signal is generated, it is detected that the pipe is clogged and is displayed on the monitor 72. On the contrary, if the hoses 41, 43 are disconnected and fertilizer leaks into the pipe at a portion other than the nozzle 46, the fertilizer pressure in the pipe falls below the pressure set by the preload valve 45. ,
In this case, both the high pressure detection part 42a and the low pressure detection part 42b of the flow detection sensor 42 are in a conductive state, and both detection parts 42a, 42b generate an electric signal together, causing a trouble such as disconnection in the pipe. Is displayed on the monitor 72.

Then, when the planting work reaches the end of the field and the planting work of the predetermined row is stopped, the switching valve 38 corresponding to the row is planted.
The operation lever 62 of is operated to the stop position B. Then, the fertilizer from the hose 41 based on the pump device 40 is guided to the return pipe 63 and further returned to the sub tank 71. Therefore, the fertilizer supply to the nozzle 46 of the switching valve 38 portion is stopped,
The fertilizer is still supplied to the nozzle 46 of the switching valve 38 located at the supply position A corresponding to the row in the planted state. When fertilizer is refluxed toward the sub-tank 71, the pressure in this pipeline becomes extremely low, so both the high and low pressure detection parts 42a, 42b of the flow detection sensor 42 become conductive. It is also detected by a switch means (not shown) that the switching valve 38 is in the switching state to the stop position B, and accordingly, the monitor section 72 displays that the fertilizer application is in the recirculation state and is interrupted.

Further, in the planting work state, the stopper device 68 is the first
In the position shown by the solid line in the drawing, the operating lever 62 of the switching valve 38 can be operated to the supply position A and the stop position B, but the operation to the cleaning position C is performed by the engaging stepped portion 62a of the plate of the operating lever 62.
When the bar contacts the bar member 66, its operation is restricted. Further, when the planting work state, that is, even if only one switching valve 38 is in the supply position A, even if the stopper members 68 are rotated to the restriction release position (chain line position) by rotating the arm members 70a and 70b, The bar member 66 is the engagement step 62a of the plate.
, And cannot be operated to the restriction release position.

In addition, the switching operation of the stopper device 68 to the restriction release position is generally performed after all fertilizer application is completed.
38 is in the stop position B. In this case, the engaging stepped portion 62a of the plate is separated from the bar member 66, and the restriction releasing operation of the stopper device 68 can be performed without any trouble.

When the fertilizer application is completed and the fertilizer application is washed, water is injected into the tank 32 in an empty state, and first the pump 40 is operated for a short period of time in the normal fertilizer mode so that the pump 40, the pipe
41, the flow detection sensor 42, etc. are washed. Further, the operating levers 62 of all the switching valves 38 are operated to the stop position B to remove the hitting elbow by the engaging stepped portion 62a of the bar member 66 of the stopper device 68, and then the arm members 70a and 70b are operated. Device 6
Rotate 8 to the release position shown by the chain line. In this state, the operation lever 62 can freely rotate and the switching valve 38 is switched to the cleaning position C. In this state, the sub-tank 71 side connection part of the return pipe 63 is removed, and pressurized water such as tap water is press-fitted there from the pipe 63, each valve 38 and the hose 43, the preload valve 45, and the nozzle 46 to wash it.

Further, at the start of fertilization, that is, at the start of driving the pump device 40,
Air may accumulate in the pump device 40 and the fertilizer may not be supplied. In this case, set one of the switching valves 38 to the cleaning position C.
Then, the return pipe 63 and the hose 43 are communicated with each other. Therefore, air is discharged from the pipe 63 located at the upper end of the sub tank 71 toward the nozzle 46, and the fertilizer in the fertilizer tank 32 is filled in the sub tank 71. Is preferably returned to the supply position A.

(G) Effect of the Invention As described above, according to the present invention, the switching valve 38
Since the stopper device 68 for restricting the change to the cleaning position C is installed, the switching valve 38 can be reliably operated to the supply position A and the stop position B during fertilization work, and it is possible to prevent erroneous operation and prevent the body etc. It is possible to prevent accidental switching to the cleaning position C by touching and to eliminate uneven fertilization.

[Brief description of drawings]

1 is a partially sectional side view showing a switching valve and a lock device portion according to the present invention, FIG. 2 is a plan view thereof, and FIG.
The figure is an overall side view showing a riding rice transplanter to which the present invention is applied, and FIG. 4 is a plan view thereof. FIG. 5 is an overall side view showing a conventional riding rice transplanter with a fertilizer application device, and FIG. 6 is a rear view thereof. 21 …… Paddy field vehicle (passenger rice transplanter), 32 …… Fertilizer tank,
38 …… switching valve, 40 …… pump device, 41 …… (pump side) hose, 43 …… (nozzle side) hose, 46 …… nozzle, 62 …… operating lever (plate), 62a …… engagement ( Section), 63 ... Return pipe, 66 ... Bar member, 68 ...
Stopper device, 70a, 70b ... Arm member, 71 ... Sub tank, A ... Supply position, B ... Stop position, C ... Washing position.

Claims (1)

[Claims] 1. A fertilizer applicator in a paddy field vehicle comprising a fertilizer tank, a pump device and a large number of nozzles, and a switching valve provided on each of the paths from the pump device to the large number of nozzles. A feed position for supplying fertilizer from the pump device to the nozzle, a stop position for stopping the supply and returning fertilizer to the fertilizer tank direction, and a washing position communicating from the fertilizer tank side to the nozzle direction while having the engaging portion Further, a stopper device is installed so as to be switchable between a restriction position for restricting the switching valve from coming into the cleaning position by contacting the engaging portion and a restriction release position for canceling the restriction. , Fertilizer application in paddy field vehicle.