JPH0767348B2 - Structure of pump room of fertilizer pump - Google Patents

Description

TECHNICAL FIELD The present invention relates to a structure of a pump chamber of a fertilizer pump for applying a fluid fertilizer such as paste fertilizer or liquid fertilizer.

[Prior art]

At the same time as planting or sowing of rice paddy working machines such as rice transplanters and direct sowing machines, fertilizer applicators for commonly fertilizing liquid fertilizers in the soil, commonly called paste fertilizers, have been put into practical use.
This fertilizer applicator has a structure in which the paste fertilizer in the fertilizer tank is fertilized in the soil from the fertilizer nozzle by a fertilizer pump arranged between the fertilizer tank and the fertilizer nozzle.

As a pump device for this type of fertilizer application, Japanese Patent Application Laid-Open No. 61-249307 has been proposed which shows an example suitable for a riding type paddy working machine. This product has a structure in which 6 screw pumps (for 6-row fertilizer application) are arranged on the same circumference. The actual situation is that it is compatible with 4 articles only by removing the pump.

[Problems to be solved by the invention]

By the way, even if the pumps for 2 rows are removed and dedicated to 4 rows as described above, the size of the pump chamber is the same for 6 rows as it is, and it is not possible to make a small pump room dedicated to 4 rows. However, there is a problem in that the weight of the pump chamber itself cannot be reduced.

In this way, when the 6-row type is also used for the 4-line type or the 5-line type, it is advantageous from the viewpoint of productivity, but this type is used in a mounting space such as a walking paddy working machine. However, there is a problem in that it is disadvantageous in terms of space and weight when it is installed on a limited machine.

Therefore, the present invention was devised in order to solve the problem in view of the conventional situation described above, and enables the weight reduction corresponding to the number of fertilizer application lines and the easy installation corresponding to the installation space. It is an object of the present invention to provide a structure of a pump chamber of a fertilizer pump that can be used in the above.

[Means for solving problems]

The present invention that achieves the above object is a fertilizer pump in which a pump unit for sending out fluid fertilizer is connected to one side of a pump chamber, and a pump drive shaft is rotatably supported on the other side, and the fertilizer pump is composed of a small number of structural units. The pump chamber is characterized by integrally projecting a plurality of tubular portions for supplying and discharging the liquid fertilizer or communicating with other pump chambers.

[Action]

As described above, the present invention is configured, and a plurality of tubular portions for supplying, discharging, or communicating with other pump chambers of the liquid fertilizer are integrally provided in the pump chamber of the fertilizer pump that is a unit unit of the number of small threads. It is possible to increase or decrease the capacity of the fertilizer pump according to the number of fertilizer application lines required, and when the number of fertilizer application lines is small, reduce the number of fertilizer pumps to reduce the size and weight. Can be achieved. In addition, the amount of fertilizer remaining can be reduced as much as possible.

Also, connect the pump part that sends fluid fertilizer to one side,
Since the above cylindrical part is projected in the pump chamber where the pump drive shaft is installed on the other side, when increasing the capacity of the fertilizer pump according to the number of fertilizer fertilizers required, use a shape that fits the installation space. Since the pump chambers can be connected side by side, the degree of freedom in mounting the fertilizer pump is extremely high.

〔Example〕

Hereinafter, the drawings showing the present invention as an embodiment will be described.

In FIG. 7, a walk-behind rice transplanter 1 has a body 2 having a rice field D.
It is supported on the rice field D by the float 3 that slides on the vehicle, and travels by traveling wheels 4 that are disposed on both left and right sides of the machine body 2 and that are in contact with the cultivator. Behind the machine body 2, a seedling placing table 5 which is obliquely installed in a front low rear height is provided so as to be capable of reciprocating in the left-right direction, and a planting rod 6 is provided below the seedling placing table 5 in opposition. . The steering handle 7 whose base end is fixed to the machine body 2 below the seedling placing table 5 extends rearward along the back surface of the seedling placing table 5. An engine 9 that drives the rice transplanter 1 is mounted in front of the machine body 2.

The rice transplanter 1 is configured so that a fertilizer application device 10 can be installed therein. The fertilizer application device 10 mounted on the machine body 2 between the engine 9 and the seedling placing table 5 is a paste fertilizer (mixed with granular fertilizer). Fertilizer tank 11 for supplying liquid fertilizer such as paste fertilizer) or liquid fertilizer, this fertilizer tank
It is composed of a fertilizer pump 12 (see FIG. 6) for inhaling and discharging the liquid fertilizer in 11 and a fertilizer nozzle 13 for guiding and fertilizing the liquid fertilizer discharged from the fertilizer pump 12 into the soil. The fertilizer pump 12 and the pump chamber 57 (see FIG. 1) are arranged immediately below the fertilizer tank 11, and
A short suction hose 14 connects between 11 and the pump chamber 57 of the fertilizer pump 12. Further, the discharge port of the fertilizer pump 12 and the fertilizer application nozzle 13 are connected by a connecting pipe 15, and the fertilizer in the fertilizer tank is provided on the upper portion of the machine body 2 facing the operation handle 7 in the middle of the connecting pipe 15. A fertilization monitor unit 18 for monitoring is provided.

The fertilizer pump 12 is driven by a transmission mechanism 21 having a gear 19 meshing with a gear 17 fixed to a PTO shaft 16 mounted on the machine body 2 as shown in FIG.
A pump unit 12 is composed of a small number of structural units (units) in which two pumps are arranged side by side, and the fertilizer pump 12 and the transmission mechanism 21 having these two structural units can be integrally assembled and disassembled. The pump unit 20 is configured to be attachable to and detachable from the gear 17 of the PTO shaft 16.

That is, as shown in FIG. 6, the drive case 22 for driving the planting rod 6 is extended obliquely rearward.
Above the above, the PTO shaft 16 is provided. Further, a rear mounting seat 23 and a front mounting seat 24 respectively provided at the front and rear ends of the pump unit 20 include a rear mounting seat 25 provided above the drive case 22 and a hydraulic pressure for wheel up and down movement of a traveling wheel 4 in front of the machine body. It is detachably attached to a front mounting seat 26 provided on the switching valve block of the cylinder base by a mounting bolt 27. The hole in the rear mounting seat 25 is closed by a removable lid when the fertilizer application device is not provided.

Further, as shown in FIG. 4, an inner gear 31 and an outer sprocket 32 are fixed to a connecting shaft 30 rotatably supported in a rear case 29 rotatably provided in a rear mounting seat 23. The gear 31 is meshed with the gear 19 rotatably supported by the fixed shaft 33 so as to project below the mounting surface of the rear case 29. The connecting plate 34, whose rear side is fixed to the outside of the rear case 29, extends forward, and the transmission case 35 is fixed to the middle portion thereof and the pump drive case 36 is fixed to the front side thereof. Then, the auxiliary transmission shaft 3
7. A main shaft 39 and a speed change shaft 40 are rotatably supported respectively, and a chain 43 is wound around a sprocket 41 fixed to the sub speed change shaft 37 and a sprocket 32 fixed to the connecting shaft 30.

A first shaft 44 and a second shaft 45 are rotatably supported by the pump drive case 36, and a sprocket 46 fixed to the first shaft 44 and a sprocket 47 fixed to the second shaft 45 have a chain 49. Further, a chain 52 is wound around the sprocket 50 fixed to the shaft end side of the first shaft 44 and the sprocket 51 fixed to the speed change shaft 40.

A transmission gear 53 slidably provided on the sub-transmission shaft 37.
Is that the rotation speed of the main shaft 39 can be changed over a predetermined range by sliding on the sub speed change shaft 37 by operating the sub speed change lever 54, and the speed change gear 55 provided only on the speed change shaft 40 is slidable. By operating the speed change lever 56, the rotation speed of the first shaft 44 can be changed over a predetermined range. The amount of protrusion of the fertilizer pump 12 can be adjusted by operating the both shift levers.

Outside the pump drive case 36, a first screw pump (pump section) 59 connected to a first shaft (pump drive shaft) 44 via a joint 48 via a pump chamber 57 having a predetermined width, and a second shaft. There is provided a pump case 65 to which a screw pump, which is composed of a second screw pump (pump portion) 60 connected to the (pump drive shaft) 45 via a joint 48 and has two threads as a structural unit, is attached. That is, in the fertilizer pump 12, the screw pumps 59 and 60 for sending out the fluid fertilizer are connected to one side of the pump chamber 57, and the first shaft 44 and the second shaft 45 for driving the screw pumps are rotatably supported to the other side of the pump chamber 57. It is a constituent unit of the number of strips for fertilizing.
This screw pump has a screw shaft 12a with a screw-shaped recess.
And a rubber pump body 12b having a hole into which the screw shaft 12a is fitted, and a rubber connecting joint 12c to which the upstream side of the connecting pipe 15 is connected is provided on the discharge side of the tip portion thereof.

The material forming the pump chamber 57 is integrally molded of synthetic resin, but as shown in FIG. 3A (1), it has an elliptical shape so as to communicate with screw pumps arranged in parallel for two threads. The pump chamber 57 is formed in a tubular shape, and a plurality of tubular portions 56a, 57b, 57c for supplying, discharging, or communicating with other pump chambers of the liquid fertilizer are integrally formed in the pump chamber 57. These upper and lower cylindrical portions 57a are formed on the upper surface side, and the upper cylindrical portion 57a is closed on the upper surface. It is composed of a lower tubular portion 57c protrudingly provided on the lower surface of the chamber 57. Reference numeral 57d denotes a fertilizer discharge cylinder 57d that is connected to the lower cylindrical portion 57c and has an opening on the lower surface. The pump chamber 57 has a third shape when viewed from the side in FIG. 3A (1).
It is configured as shown in Fig. A (2), and its longitudinal section is the third.
It is as shown in FIG.

Then, in the case of the double-row fertilization shown in FIG. 1, B (1) in FIG.
Like the side tubular part whose end face is cut away leaving a distance X like
57b is connected to the fertilizer tank 11 via the suction hose 14 and is used for supplying fertilizer. Also, the fertilizer discharge tube
57d is directly connected to the drain hose 61, and the lower end of the drain hose 61 is closed by a detachable cap 62, and it is normally detachably locked to a hook 63 attached to the machine body 2 so that it can move laterally. It is stored in the direction, but the cap 62 is detached from the hook 63 and can be flexed long.
By removing, the remaining amount of fertilizer from the fertilizer tank 11 to the pump chamber 57 can be easily discharged.

As shown in FIG. 2, in the case of four-row fertilization, below the upper-stage pump chamber 57 having the two-row fertilization shown in FIG. 1 as a structural unit,
It is only necessary to connect the lower pump chamber 57 having the double-row fertilizer as a constituent unit. That is, the upper pump chamber 57 is, as shown in FIG. 3C,
The end face of the side tubular portion 57b for supplying fertilizer is cut at a distance X, and the lower tubular portion 57c at a distance Y is cut. Then, as shown in FIG. 3D, the pump chamber 57 provided in the lower stage is cut off while leaving the upper cylindrical portion 57a by the distance z. Since the inner diameter D of the cut upper tubular portion 57a located in the lower stage and the outer diameter d of the lower tubular portion 57c located in the upper stage after cutting are such that inner diameter D> outer diameter d A rubber seal 64 is interposed between the parts so that they can be detachably fitted and connected in an airtight manner. In this case, in the lower pump chamber 57, the fertilizer discharge cylinder 57d that remains below is directly connected to the drain hose 61, so that the pump chamber 57 of a four-row fertilizer in which the small-capacity pump chambers 57 whose constituent units are two-row fertilizer are continuous with each other. It can be configured in chamber 57.

Inside the lower pump chamber 57, a first shaft 44 and a second shaft 45 supported by a pump drive case 36 are arranged, and a joint 48 is connected to the first shaft 44 and the second shaft 45. A first screw pump 59 and a second screw pump 60, which are connected to each other, are provided. A pump case 65 having a screw pump is attached to the outside of the lower pump chamber 57. A chain 49 is wound around the sprocket 46 fixed to the lower first shaft 44 and the sprocket 47 fixed to the second shaft 45, but the sprocket 50 fixed to the upper first shaft 44 and the lower sprocket 50. 1 axis 44
The sprocket 50 fixed to is the sprocket 50,5
It is driven and rotated in the same direction by a sprocket 51 fixed to the transmission shaft 40 via a chain 52 wound around 0.

Further, in the case of 6-row fertilizer application, although not shown, the pump chambers 57 whose constituent units are 2-row fertilizer may be connected in three stages in the vertical direction. That is, the two-stage arrangement shown in FIG. 2 (four-row fertilization)
The pump chamber 57 having two-row fertilizer as a constituent unit is connected to the lower side of the pump chamber 57, and the pump chamber 57 having two-row fertilizer as a unit is a six-row fertilizer pump that is vertically continuous in three stages. Composed in chamber 57.

In the case of 6-row fertilizer in which the pump chamber 57, which is a unit of 2-row fertilizer, is continuous in the vertical direction in 3 steps, the fertilizer pump 12 of 3 steps is used.
Is a set of three sprockets 5 fixed to the respective first shafts 44.
The chains 52 wound around 0, 50, 50 and a sprocket 51 fixed to the transmission shaft 40 are driven and rotated in the same direction, respectively.

In this way, the pump room of the fertilizer pump 12 in units of two articles each
When 57 are connected in a plurality of stages in the vertical direction, the uppermost pump chamber 57 has its side tubular portion 57b for supplying fertilizer communicated with the fertilizer tank 11 arranged directly above via the short suction hose 14. , The pump chamber 57 at the bottom is the fertilizer discharge tube 57
d is directly connected to the drain hose 61.

Thus, the present invention, the pump chamber 57 of the fertilizer pump 12, which is a structural unit of a small number of strips, a plurality of tubular portions 57a for supplying, discharging, or communicating with other pump chambers 57 of the liquid fertilizer, 57b,
Since 57c is integrally projected, the capacity of the fertilizer pump can be increased or decreased according to the required number of fertilizer application lines, and when the number of fertilizer application lines is small, the number of fertilizer pumps 12 is reduced to reduce the size, Can be lightweight.

Further, when 6 or more fertilizers are applied, that is, when 3 or more fertilizer pumps 12 are connected in units of 2 articles, the fertilizer pumps 12 are L-shaped instead of being connected in a plurality of stages vertically as described above. To connect the pump chambers 57 to each other by using the tubular portions 57a, 57b, 57c as described above, or to connect the pump chambers 57 to each other so as to form a U shape (for example, when connecting four fertilizer pumps 12). You can also Therefore, when increasing the capacity of the fertilizer pump 12 in accordance with the required number of fertilizer application lines, the pump chambers 57 can be connected side by side in a shape that matches the mounting space, so that the fertilizer pump 12 can be installed with a greater degree of freedom. Can be higher.

As shown in FIG. 4, the pump chamber 57 is a pump drive case.
The rubber packing fixed to the outer end face 36a of the pump 36 and the rubber packing fixed to the inner end face 65a of the pump case 65 are arranged between the pump drive case 36 and the pump case 65 so that the gap between them is opposite. Multiple colors to regulate to a certain width
It is fastened by respective mounting bolts 67 penetrating the inside of 66.

In the case of the double fertilizer application shown in Fig. 1, the collar 66 on the lower right side
The front mounting seat 24 is fixed to the lower end of the stay 69 whose upper end is fixed to the. In the case of four-row fertilizer in which the two-row fertilizer as a constituent unit is arranged in two steps above and below, as shown in FIG. 2, both ends are spread over the collars 66, 66 of the upper and lower rows located on the lower right side. A fixed bracket 70 is provided, and the front mounting seat 24 is fixed to the lower end of the stay 69 whose upper end is fixed to the bracket 70. One of the front mounting seats 24 is bent and extended to serve also as the stay 69a.

Furthermore, in the case of the two-row fertilizer application shown in FIG.
A bracket 71 is fixed to each of the collars 66, 66, and the two-row fertilizer application of the structural unit shown in FIG.
In case of fertilizer application, the bracket 71 is fixed to the upper and lower three collars 66, 66, 66 on the left side, and the bracket 71 can be attached using the collar 66 in this way. Then, a bonnet or the like for covering the body 2 can be attached.

〔The invention's effect〕

As described above, the present invention is a fertilizer pump in which a pump unit that sends out fluid fertilizer is connected to one side of the pump chamber, and a pump drive shaft is rotatably supported on the other side, and the fertilizer pump is a structural unit of a small number of articles. Since the pump chamber is integrally provided with a plurality of tubular portions for supplying, discharging, or communicating with other pump chambers, the pump chamber has the following excellent effects. is there.

That is, the pump chamber of the fertilizer pump, which is a structural unit of a small number of threads, is provided with a plurality of tubular portions integrally for supplying, discharging, or communicating with other pump chambers of the liquid fertilizer, Since the capacity of the fertilizer pump can be increased or decreased according to the required number of fertilizer application lines, when the number of fertilizer application lines is small, the number of fertilizer pumps can be reduced to reduce the size and weight.

Also, connect the pump part that sends fluid fertilizer to one side,
When the capacity of the fertilizer pump is increased according to the required number of fertilizer application, the shape that fits the mounting space is adopted because the configuration is such that multiple cylindrical parts are projected in the pump chamber with the pump drive shaft on the other side. It is possible to connect the pump chambers side by side with each other, whereby it is possible to easily perform the mounting corresponding to the mounting space, and it is possible to increase the mounting flexibility of the fertilizer pump. In particular, it is extremely effective for a walk-type paddy working machine with a limited mounting space.

[Brief description of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is a vertical sectional view of a pump chamber of a fertilizer pump for two articles, and Fig. 2 is a pump when two fertilizer pumps for two articles are arranged side by side in upper and lower stages. 3A to 3D are longitudinal sectional views of the chamber, and FIGS. 3A to 3D are machining explanatory views showing the machining order of the cylindrical portion projecting in the pump chamber. ) Is a rear view of the pump chamber, (3) is a vertical cross-sectional view of (2), FIG. 4 is a cross-sectional view showing the drive main part of the pump unit of the fertilizer application in a plane, and FIG. Right side view of the main part, Fig. 6 is a left side view of the main part of the fertilizer applicator,
FIG. 7 is an overall side view of a rice transplanter equipped with a fertilizer application device. 1 ... Rice transplanter, 10 ... Fertilizer, 11 ... Fertilizer tank, 12 ... Fertilizer pump, 13 ... Fertilizer nozzle, 14 ... Suction hose, 20 ...
Pump unit, 44 ... First shaft (pump drive shaft), 45 ... Second shaft (pump drive shaft), 57 ... Pump chamber, 57a ... Upper tubular portion, 57b ... Side tubular portion, 57c ... Lower tubular portion Part, 57d ... Fertilizer discharge tube (drain port), 59 ... First screw pump (pump part),
60… Second screw pump (pump part).

Claims (1)

[Claims] 1. A fertilizer pump in which a pump portion for feeding a fluid fertilizer is connected to one side of a pump chamber and a pump drive shaft is rotatably supported on the other side, the fertilizer pump being a structural unit of a small number of rows.
A structure of a pump chamber of a fertilizer pump in which a plurality of tubular portions for integrally supplying, discharging, or communicating with other pump chambers of the liquid fertilizer are projectingly provided in the pump chamber.