JP3331817B2 - Nozzle clogging prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement or prevention of clogging of a nozzle of a nozzle injection device for the purpose of soil improvement, control and fertilization.

[0002]

2. Description of the Related Art As an apparatus for preventing clogging of a nozzle, for example, an apparatus described in Japanese Utility Model Publication No. 55-16677 and shown in FIG. 7 has been proposed.

This apparatus has a nozzle front portion b having a nozzle hole a at a tip, a cleaning needle c for cleaning the nozzle hole a held in the nozzle front portion movably in the direction of the nozzle hole a, and At the rear end, there is provided a connection port d for appropriately connecting to an ink supply source. The nozzle rear section e is connected to the nozzle front section b, and is provided at the rear end of the cleaning needle c to face the connection port d of the nozzle rear section e. A cylindrical portion f, and a spring means g for urging the cleaning needle c so that the cylindrical portion f faces the connection port d.
A small hole h provided on a side peripheral wall of the cylindrical portion f for guiding the pressurized ink from the connection port d to the nozzle hole a, and ink is supplied to the nozzle hole a via the connection port d. Is performed, the cleaning needle c is moved to the nozzle hole a side by the pressure of the pressurized ink introduced into the cylindrical portion f, and the operation thereof is as follows.

In the apparatus having the above-described structure, when ink ejection is started from a state in which ink ejection is stopped, pressurized ink is sent into the cylindrical portion f through the connection port d, and at this time, the cleaning needle c Since the pressure around the tip of the nozzle hole is low, the cleaning needle c that is separated from the nozzle hole a momentarily closes the nozzle hole a, and in this state, the cleaning needle c is positioned from the cylindrical portion f via the small hole h. Ink is sent into the space, and thereafter, as the pressure in the entire area inside the nozzle rises, the cleaning needle c retreats with a slight time delay due to the repulsive force of the spring means g, returns to the original state, and returns from the nozzle hole a. The ejection of ink starts. That is, the cleaning needle c does not always close the nozzle hole a, but enters the nozzle hole a for a moment before the ink is ejected to perform cleaning.

[0005]

The above-mentioned conventional example is not a problem because it is a nozzle device used for various printing devices, but it is not a problem in the nozzle which injects a liquid into the soil which this invention is intended to adopt. The shorter the distance between the nozzle body and the soil, the better the straightness of the nozzle into the soil, but when the liquid injection from the nozzle is stopped, the fine particles of the soil fly in the air around the nozzle, A phenomenon occurs in which the fine particles are repelled and clogged in the nozzle hole by the reflection of the jet from the soil. It is an object of the present invention to automatically release the clogging to the outside, secure the original hole diameter, keep the discharge amount constant, and maintain the straightness of the nozzle.

[0006]

According to the apparatus of the present invention , a nozzle hole (1) for ejecting an intermittently acting pressure fluid is provided.
A nozzle body (4) in which 1) is formed, a pin (9) inside the nozzle body (4) and removably facing the nozzle hole (11), and a pin (9). A spring (20) for urging the tip portion (10) so as to be able to enter the nozzle hole (11), and a urging force of the spring (20) by receiving the pressure of the pressure liquid entering the nozzle body (4). A pressure receiving portion (8) integrally formed with the pin (9) so as to displace the pin (9) in opposition so that the tip (10) of the pin (9) escapes from the nozzle hole (11). Equipped.

According to the device of the present invention , the spring (2)
The tip (10) of the pin (9) against the urging force of (0)
The action of allowing the pressure to escape from the nozzle hole (11) is achieved by the difference between the cross-sectional area of the pin (9) and the cross-sectional area of the pressure receiving portion (8) formed integrally therewith.

[0008]

In the device according to the present invention , the tip (10) of the pin (9) is always in the nozzle hole (11) by the action of the spring (20).
When the high-pressure liquid enters the nozzle body (4), the tip (10) of the pin (9) is moved from the nozzle hole (11) against the urging force of the spring (20). Escape and enable ejection of high pressure liquid.

In the device according to the present invention , the difference between the cross-sectional area of the pin (9) and the cross-sectional area of the pressure receiving portion (8) integral therewith is expressed by
The tip (1) of the pin (9) is opposed to the force of the spring (20).
0) escapes from the nozzle hole (11).

[0010]

1 and 2, a description will be given of a nozzle clogging prevention device according to the present invention. After that, referring to FIGS. 3 to 6, a high-pressure liquid injection vehicle to which the device according to the present invention is mounted. Will be described.

1 and 2, reference numeral 1 denotes a pipe main body into which high-pressure water from a pump (not shown) is introduced, and a hollow mounting seat 3 is provided in a screw hole 2 formed on the lower surface of the pipe main body 1. Is screwed and fixed, and a hollow nozzle body-4 is screwed and fixed to the mounting seat 3.

On the other hand, a screw hole 5 is also formed on the upper surface of the pipe main body 1, and a hollow spring cylinder 6 is screwed and fixed in the screw hole 5. The upper end of the spring cylinder 6 is closed by a lid 7.

A pin 9 integrally formed with a pressure receiving portion 8 extending from the spring cylinder 6 to the mounting seat 3 through the inside of the pipe main body 1 includes:
The tip 10 penetrates through the inside of the nozzle body-4, and is inserted into a nozzle hole 11 formed at the lower end of the nozzle body-4 to close it. In practice, it is desirable that the pressure receiving portion 8 and the pin 9 which are integrally formed are made of, for example, spring steel, ceramic or the like which have sufficient strength, elasticity, and wear resistance.

A center hole 12 through which the pin 9 is inserted and a small hole 13 around the center hole 12 are provided in the nozzle body-4.
Are formed and screwed and fixed.
When the diameter of the pressure receiving portion 8 is D, the inner diameter of the center hole 12 and the nozzle hole 11 is d2, and the diameter of the pin 9 is d1, the relationship of D>d2> d1 is satisfied.

The pressure receiving portion 8 is connected to a spring chamber 1 of the spring cylinder 6 through a seal 15 formed on a sliding surface portion with the spring cylinder 6.
6, between a spring seat 17 formed at the upper end of the pressure receiving portion 8 and a spring seat 19 formed at the lower end of an adjusting screw 18 screwed into the lid 7 from outside. 20 is contracted.

When the high-pressure liquid from the pump is introduced into the pipe main body 1, there is a relationship of φD> φd1 between the diameter d1 of the pin 9 and the diameter D of the pressure receiving portion 8, and the difference is appropriately set. Accordingly, the pin 9 moves upward due to the difference between the total pressure based on the cross-sectional area of the pin 9 and the pressure receiving portion 8, passes through the small hole 13 of the guide 14, and the high-pressure liquid is discharged from the pin 9. It is ejected from the nozzle hole 11 opened by the retreat of the tip portion 10.

At this time, by rotating the pressure adjusting screw 18, the load of the spring 20 can be controlled, whereby the pushing force of the pin 9 can be finely adjusted. When the supply of the high-pressure liquid is stopped, the pin 9 moves downward by the action of the spring 20, the tip 10 of the pin 9 closes the nozzle hole 11 again, and fine particles such as soil, sand, etc. come from outside. From entering the nozzle hole 11.

In practice, the tip portion 10 of the pin 9 is formed to be slightly tapered, so that the advancing / retreating operation with respect to the nozzle hole 11 can be made smoother.

Next, a state in which the nozzle clogging prevention device having the above-described configuration is mounted on a high-pressure liquid injection vehicle will be described with reference to FIGS.

FIG. 3 is a side view of the high-pressure liquid injection vehicle 22.
One front wheel 23 and left and right rear wheels 24 are
The frame 25 is provided at the front center in the left-right direction and at the rear left and right, respectively, and supports the frame 25. An operator's seat 26, a liquid tank 27 for storing a fertilizer liquid, a chemical liquid, water, or the like, an engine 28, and an injector 29 are arranged in this order from the top. The rear bumper 30 is
At the same height as the frame 25, the frame 25 projects rearward from the frame 25 so as to surround the injector 29 from the left and right sides and the rear of the injector 29.

FIG. 4 is a configuration diagram of a power system and the like of the high-pressure liquid injection vehicle 22. The driver's seat 26 includes a seat 3 on which the driver sits.
1, and a steering wheel 32 that is rotated to steer the high-pressure liquid injection vehicle 22 is provided, and the front wheels 23 are steered in conjunction with the rotation of the steering wheel 32. . Hydraulic drive (HST) 3
Reference numeral 3 denotes a hydraulic pump and a hydraulic motor, which are driven by a traveling engine 34. The rotational power of a hydraulic driving device 33 is transmitted through a gear type transmission 35 and a differential device 36 to the left and right rear wheels 24. Is transmitted to

The main transmission lever 37 and the sub transmission lever 38 are disposed in the driver's seat 26. The main transmission lever 37 controls the output rotation speed and forward / backward movement of the hydraulic drive unit 33, and the sub transmission lever 38 Switches the meshing of the gears in the gear transmission 35 to control the reduction ratio of the gear transmission 35. The hydraulic drive unit 33 and the oil tank 39 are connected to each other by a hydraulic circuit, and the oil derived from the hydraulic drive unit 33 is cooled by an oil cooler 40 and filtered by a filter 41 for foreign matter. Return to the oil tank 39. The switching valve 42 is connected to a hydraulic cylinder 44 of the injector 29 via an oil passage 43 and controls a hydraulic pressure sent from the hydraulic driving device 33 to the hydraulic cylinder 44. The rotational power of the work machine engine 45 is transmitted to an intermittent injection pump 47 via an electromagnetic clutch 46, and the intermittent injection pump 47 injects the liquid in the liquid tank 27 via a strainer 48. The high-pressure liquid discharged from the intermittent injection pump 47 is guided to the above-mentioned pipe main body 1 of the injector 29 via a high-pressure hose 49.

FIGS. 5 and 6 are a side view of the injector 29 and a view of the injector 29 from the rear. The pipe body 1 extends linearly in the left-right direction, and the nozzle body-4 shown in FIG. 1 is downwardly oriented and attached to the pipe body 1 at regular intervals in a line in the longitudinal direction. The left and right connection brackets 54 are attached to the left and right ends of the pipe main body 1 at the front ends, respectively. The crushing roller 52 includes the pipe body 1.
And at the left and right ends, the roller bracket 53 is rotatably supported at the substantially central portion in the front-rear direction so as not to fall off. These roller brackets 53 are fixed to the rear end of the connection bracket 54.

In FIG. 5, the protection plate 55 is screwed to the front end of the roller bracket 53 so as to be vertically adjustable. The protection plate 55 covers the front and lower portions of the row of the nozzle bodies-4, and slides on the ground 56 in front of the nozzle bodies-4 while the high-pressure liquid injection vehicle 22 is running. Protect. The protection plate 55 has a through-hole (not shown) at a position facing the nozzle hole 11 (see FIG. 1) of each nozzle body-4. After passing through the through hole, it is jetted to the ground 56.

4 and 5, a scraper 57 is provided.
Is located behind the suppression roller 52.
It extends in the left-right direction along 2 and is in contact with the pressure reduction roller 52. The brush 59 extends parallel to the pressure reducing roller 52 further behind the scraper 57, and is fixed to the rear end of the roller bracket 53 at the left and right ends by adjusting screws 60 so that the height can be adjusted. 56.

The gate-shaped fixing frame 61 is fixed to the rear end of the frame 25 in an upright state. The vertical moving frame 62 has vertical sides 63 on the left and right, and guide rollers 64 for left, right, up and down. As a result, the fixed frame 61 is supported by the fixed frame 61 so as to be vertically movable. The hydraulic cylinder 44 extends in the vertical direction, and is coupled to a fixed frame 61 and a vertical moving frame 62 at upper and lower ends, respectively, and moves the vertical moving frame 62 up and down with respect to the fixed frame 61 by expansion and contraction. The left and right vertical posts 65 are connected to the left and right vertical sides 6.
3, and the upper and lower link rods 66 are
It is connected to the vertical side portion 63 and the vertical post 65 via a ball joint (not shown), and can be three-dimensionally displaced independently of each other and within a predetermined range with respect to the vertical moving frame 62. The upper and lower link rods 66 constitute a four-point parallel link device 67 together with the vertical side portion 63 and the vertical post 65.

The tension springs 68 as urging means are locked at both ends thereof at the intermediate portions of the vertical moving frame 62 and the upper link rod 66 to urge the vertical posts 65 downward and to reduce the pressure. When the floor 52 is lifted off the ground 56, the pipe body 1 and the pressure-reducing roller 52 are automatically returned to the horizontal direction by the balanced lateral biasing force of the left and right tension springs 68. The vertical post 65 is fixed to the connecting bracket 54 at the lower end so that the vertical post 65 is located at the position of the compression roller 52 in the front-rear direction.

The pulley 69 is rotatably attached to each of the left and right vertical sides 63 of the vertical moving frame 62.
Both ends are respectively engaged with the lower end portions of the right and left vertical sides 63 of the fixed frame 61 and the connecting portion of the lower link bar 66 to the vertical post 65, and are lifted at the center to be pulled up by the pulley 69.
It is hung on. As a result, the vertical post 65 undergoes a large change with respect to a small upward displacement of the vertical moving frame 62, thereby enabling quick displacement of the pressure reduction roller 52 and the like.

The high-pressure liquid injection operation by the high-pressure liquid injection wheel 22 will be described. In the operation of intermittently injecting the liquid into the ground 56, the hydraulic cylinder 44 is extended by switching the hydraulic pressure at the switching valve 42. As a result, the vertical moving frame 62 descends with respect to the fixed frame 61, and the pressure-reducing roller 52 comes into contact with the ground 56. Next, as the high-pressure liquid injection vehicle 22 moves forward, a liquid such as a fertilizer liquid is intermittently fed from the intermittent injection pump 47 to each nozzle body 4 via the high-pressure hose 49, and the ground 56 is discharged from the nozzle hole 11. The high-pressure liquid is injected toward. The protection plate 55 covers the front and the bottom of the row of the nozzle bodies-4 during traveling, and prevents a projection such as a stone on the ground 56 from hitting the nozzle bodies-4 and damaging the nozzle bodies-4.

As described above, the protection plate 55 has at least a portion corresponding to the nozzle hole 11 of each nozzle body-4 as a through-hole. After passing through the surface, it is injected into the ground 56, penetrates into the ground 56, and forms a through hole for an air rate perpendicular to the ground 56. The crushing roller 52 is pressed against the ground 56 by its own weight and the urging force of the tension spring 68 via the vertical post 65, and rolls on the ground 56, and
The portion of the ground 56 that has been raised due to the injection of the high-pressure liquid into 6 is crushed behind the nozzle body-4. Scraper
The tip 57 rubs the tip against the pressure-suppressing roller 52 to peel off mud and the like adhering to the pressure-suppressing roller 52 from the pressure-suppressing roller 52. The brush 59 brushes the ground 56 after crushing by the crushing roller 52.

[0031]

According to the apparatus of the present invention, when the injection of the pressure liquid from the pump is stopped, the nozzle hole is closed, so that the rebound of fine particles such as sand and soil enter the nozzle hole. Prevents clogging of the nozzle, thereby ensuring a good injection amount at all times, maintaining the straightness of the injected pressure liquid, and also has an effect of preventing liquid dripping. Things.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a clogging prevention device according to the present invention.

FIG. 2 is a sectional view taken along line II in FIG.

FIG. 3 is a side view of a high-pressure injection wheel to which the clogging prevention device of the present invention is applied.

FIG. 4 is a configuration diagram of a power system and the like of the high-pressure injection vehicle.

FIG. 5 is a side view of a pressure liquid injection section of the high pressure injection wheel.

6 is a view of the injection section shown in FIG. 5 as viewed from the rear.

FIG. 7 is a sectional view of an example of a conventional example.

[Explanation of symbols]

 4 Nozzle body 8 Pressure receiving part 9 Pin 10 Tip part 11 Nozzle hole 20 Spring

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B05B 15/02 A01C 23/00 A01G 7/00 602 A01M 7/00

Claims (1)

(57) [Claims] 1. A nozzle body (4) formed with a nozzle hole (11) for ejecting an intermittently acting pressure liquid, and said nozzle hole (1) inside said nozzle body (4).
A pin (9) removably inserted into 1), a spring (20) for urging the tip (10) of the pin (9) to enter the nozzle hole (11), and the nozzle body;
(4) The spring (2) receives the pressure of the pressure fluid entering the inside of the spring (2).
The pin (9) is displaced against the urging force of the pin (9), and the tip (10) of the pin (9) is moved to the nozzle hole (11).
A pressure receiving portion (8) integrally formed with the pin (9) so as to escape from the spring, and against the urging force of the spring (20).
The tip (10) of the pin (9) with the nozzle hole (1).
The action of escape from 1) is the cross-sectional area of the pin (9).
Due to the difference in the cross-sectional area of the pressure receiving part (8) integrally formed with
Nozzle clog prevention device achieved .