JP2001161794A - Heat sterilizing device for soil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To heat-sterilize soil while reducing energy losses. SOLUTION: A slender distribution pipe 6 is provided which is horizontally disposed on the surface part of the soil 1. A number of injection pipes 7 projecting into the soil 1 are communicated with the distribution pipe 6, with predetermined longitudinal intervals between the injection pipes. Discharge openings 7a and 7b are formed in the lower portion of each of the injection pipes 7, and the distribution pipe 6 is provided with a heated fluid supply device 9 for supplying boiling water (or steam) and a moving device 10 for moving the distribution pipe 6 in a direction perpendicular to its longitudinal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soil heat disinfection apparatus for heating soil with hot water (or steam) to kill pathogenic bacteria of horticultural crops.

[0002]

2. Description of the Related Art As a conventional technique, an elongated sprinkler pipe (sprinkler pipe) having a number of discharge holes formed in a longitudinal direction is provided, and the sprinkler pipe is arranged such that each discharge hole faces rearward upward. The sprinkler pipe is connected to a hose for supplying hot water and a wire for drawing, and hot water is supplied from the hose to the sprinkler pipe to discharge the hot water from each discharge hole. There has been a soil heat disinfecting apparatus that sprays water and moves a watering pipe along the soil surface by the rope, thereby heating the soil to a temperature equal to or higher than the killing temperature of crop pathogenic bacteria.

[0003]

In the above-mentioned prior art, the hot water is sprayed on the surface of the soil, so that the hot water easily radiates heat from the soil surface, and it takes time for the hot water to penetrate into the soil. However, when the depth increases, a large amount of hot water is required. For this reason, the conventional one lowers the heating efficiency of the soil. An object of the present invention is to obtain a novel soil heat disinfection apparatus which solves the above-mentioned disadvantages by directly injecting hot water into soil.

[0004]

Means for Solving the Problems In order to achieve the above object, the present invention is configured as follows. That is, the invention according to claim 1 provides an elongated distribution pipe which is horizontally disposed on the surface of the soil, and a plurality of injection pipes projecting into the soil are provided on the distribution pipe at predetermined intervals in the longitudinal direction. And a heating fluid supply device that forms a discharge port at the lower part of each injection pipe and supplies hot water or steam to the distribution pipe, and moves the distribution pipe in a direction orthogonal to the longitudinal direction thereof. And a device. The invention according to claim 2 is such that each of the injection pipes is inclined rearward and downward with respect to its forward direction. According to a third aspect of the present invention, the discharge port of each of the injection pipes is provided on the lower surface of the injection pipe and on the side opposite to the advance surface of the injection pipe. According to a fourth aspect of the present invention, each of the injection pipes is formed in a wedge-shaped cross-section having a gradually decreasing width from the opposite side to the forward side. Further, the invention according to claim 5 is provided with a front wheel and a rear wheel that support a distribution pipe, and the rear wheel has an upper position in which a lower end is located above a lower end of each of the injection pipes,
An up-down movement device is provided for moving up and down to a lower position located below the lower end of each injection pipe.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a cross-sectional view corresponding to II-II in FIG. 1, FIG. 3 is a side cross-sectional view in a state where a rear wheel is switched to a lower position, and FIG. FIG. 5 is a sectional view taken along the line VV in FIG. 4.

1 and 2, reference numeral 1 denotes a soil to be disinfected, and the surface of the soil 1 is covered with a heat-resistant and air-impermeable sheet 2, for example, a polyethylene sheet. The heating and disinfecting device 3 is placed on the upper surface of the soil 1 covered by the sheet 2. This heating disinfection device 3 is as follows. That is, a frame 4 elongated in the left-right direction (vertical direction in FIG. 1) is supported by front wheels 13 and rear wheels 14 so as to be movable in the front-rear direction (left-right direction in FIG. 1). A pipe distribution pipe 6 is attached. The length of the distribution pipe 6 is appropriately adjusted so as to be about 3 m to 8 m according to the width of the soil 1 to be disinfected.

A large number of injection pipes 7 made of metal pipes are arranged in a comb-like shape on the lower surface of the distribution pipe 6, and are detachably connected to each other. The length of each injection tube 7 is about 290 mm, and the pitch in the left-right direction is about 150 mm. In addition, each injection pipe 7
Is inclined downward at an angle of about 35 degrees rearward with respect to the vertical line, as shown in FIG. In addition, the length of the said injection pipe 7,
The pitch and the backward inclination angle are appropriately set depending on the properties and depth of the soil.

[0008] Discharge ports 7a, 7b
To form That is, as shown in FIG. 4, the lower end is opened, and the back side of the lower end is removed at a rising angle of about 35 degrees, whereby the hot water is discharged downward from the lower end of each injection pipe 7. A downward discharge port 7a and a backward discharge port 7b for discharging hot water rearward are formed continuously. Further, as shown in FIG. 5, the cross-sectional shape of each of the injection pipes 7 is such that the width of the advance surface (left surface) is small,
The taper angle is about 20 degrees from the advancing surface side to the non-advancing surface (right surface) side, so that the wedge shape gradually becomes wider, so that the resistance when traveling in the soil 1 is reduced.

A branch pipe (hose) 8 is arranged in parallel on the front side of the distribution pipe 6 and attached to the frame 4. Both ends of the branch pipe 8 and a middle part in the longitudinal direction are connected to both ends of the distribution pipe 6. And the middle part in the longitudinal direction. A hot water supply hose (heating fluid supply device) 9 for a boiler (not shown) is connected to a middle portion of the branch pipe 8 in the longitudinal direction, and about 90 ° C. hot water is supplied from the supply hose 9 through the branch pipe 8. To the distribution pipe 6.

As shown in FIG. 2, the front wheel 13 is attached to a front bracket 15 which is fixed forwardly from both left and right ends of the frame 4. This front bracket 15
Bent the front part downward, and three shaft holes 15
a, 15b, 15c are opened up and down at a predetermined pitch, and soil 1
When disinfecting the front wheel, the front wheel 13 is attached to the uppermost shaft hole 15a, and as shown in FIG. 2, the lower end of the front wheel 13 is brought into contact with the soil, and the seat 2 is lifted at the upper end. When the soil 1 is not disinfected, the front wheel 13 is attached to the lowermost shaft hole 15c or the middle shaft hole 15b, and the frame 4 is greatly lifted from the soil surface or the road surface to facilitate movement.

The above-mentioned rear wheel 14 is provided with a vertically moving device 16.
Is moved up and down. This vertical movement device 16 is as shown in FIG. That is, a rear bracket 17 is fixed to the center of the frame 4 in the left and right direction so as to project rearward, and an arm 19 is connected to a middle part of the rear bracket 17 via a fulcrum pin 18 so as to be vertically swingable. The rear wheel 14 is attached to the rear end of the rear wheel 19. The two restriction holes 17a and 17b are opened at the rear end of the rear bracket 17 on an arc line centered on the fulcrum pin 18 by vertically separating the restriction holes 17a and 17b.
One stop hole 19a capable of communicating with 17b is made.

Then, when disinfecting the soil 1, as shown in FIG. 2, the arm 19 is swung upward to align the stopper hole 19a with the upper regulating hole 17a, and stop at this part. By inserting the pin 20, the arm 19 is inserted.
Is positioned on the upper side, and the lower end of the rear wheel 14 is positioned above the lower end of each injection pipe 7, and the upper end of the rear wheel 14 is positioned above the distribution pipe 6. Is buried to a depth of about 10 cm to 15 cm in the soil 1, and the seat 2 is lifted by the upper end of the rear wheel 14.

When the soil 1 is not to be disinfected, as shown in FIG. 3, the arm 19 is swung downward so that the stopper hole 19a is aligned with the lower regulating hole 17b, and the stopper pin 20 is attached to this part. By inserting the arm, the arm 19 is positioned on the lower side, and the lower end of the rear wheel 14 is positioned lower than the lower end of each injection pipe 7. Thereby, each injection pipe 7 is separated upward from the soil surface or the road surface to facilitate movement of the heating and disinfecting apparatus 3.

A hook 4a is attached to each of the left and right ends and the left and right center of the frame 4, and a towed body (moving device) 10 such as a wire or a rope drawn out of a winch (not shown) is connected to the hook. This towing body 10
As shown in FIG. 1, the traction members 10b, 10
b is gathered in the middle on the towing body 10a at the center in the left and right direction to form a single body, wound around a winch drum, and towed to the left in FIG. In FIG. 1, reference numeral 12 denotes a handle which also serves as a damper attached to the left and right ends of the frame 4 to prevent collision with an obstacle and adjust the direction of the heating and disinfecting device 3 by an operator operating the handle. I do.

According to the above embodiment, as shown in FIG.
When the arm 19 is positioned on the upper side and the rear wheel 14 is moved upward, the lower end of each injection pipe 7 becomes approximately 10c in the soil 1.
It is buried up to a depth of 15 mm to 15 cm. In this state, when the sheet 2 is put on the top surface of the soil 1 and hot water is supplied from the supply hose 9 to the branch pipe 7, the hot water is applied to the distribution pipe 6 from the left and right central portions and the left and right ends of the branch pipe 7 at substantially equal pressure. The hot water flows through the outlets 7 a and 7 b of each injection pipe 7 into the soil 1. In this state, when the frame 4 is moved to the left in FIG. 2 by the towing body (wire) 10, that is, is advanced, the hot water is discharged from the discharge ports 7 a and 7 b while each of the injection pipes 7 pushes the soil 1. The boiling water permeates into the scraped soil. Thereby, the soil is efficiently and substantially uniformly heated, and the soil in the deep layer is smoothly heated. In addition, the hot air rising from the surface of the soil 1 is prevented from radiating heat to the outside by the sheet 2.

In this case, since each injection pipe 7 is inclined backward and its cross-sectional area is formed in a wedge shape in which the forward side is reduced, the function of a plow is exerted, and the soil is efficiently pushed. In addition, since the discharge ports 7a and 7b are formed so as to be continuous with the lower surface of each injection pipe 7 and the rear side of the lower end, the discharge range of the hot water is expanded, and the hot water is widely dispersed in the soil, and the soil heating efficiency is high. And clogging becomes difficult.
Further, when the discharge ports 7a and 7b are clogged, the clogged soil can be easily scraped out from the rearward discharge port 7b side. In the present invention, steam may be supplied to the distribution pipe 6.

[0017]

As is apparent from the above description, the invention according to the first aspect of the present invention is characterized in that a long number of injection pipes having a discharge port at the lower part are provided in a long and narrow distribution pipe to which hot water (or steam) is supplied. The hot water discharged from the injection pipe quickly penetrates into the soil, and the energy loss is reduced. And heat disinfecting the soil, and heat disinfecting the soil in a deep layer smoothly. Further, in the invention according to claim 2, since each of the injection pipes is inclined rearward and downward with respect to the advance direction, when the injection pipe collides with a large obstacle such as a stone at the time of traveling, it can get over the obstacle. And the breakage and damage of the injection tube are reduced. According to the third aspect of the present invention, since the discharge port is provided on the lower surface of the injection pipe and on the side opposite to the advance surface, the discharge range of the hot water is expanded, and the soil can be efficiently and substantially uniformly heated. In addition, it becomes difficult for the discharge port to be clogged,
Cleaning when clogged becomes easy. In the invention according to claim 4, since each of the injection pipes has a wedge-shaped cross-section having a gradually decreasing width from the non-advancing surface side to the advancing surface side, it is possible to efficiently scrape the soil. In the invention according to claim 5, the front wheel and the rear wheel for supporting the distribution pipe are provided, and the rear wheel is moved up and down. , The up and down movement device for moving the rear wheel up and down can be reduced in size.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a sectional view corresponding to II-II in FIG.

FIG. 3 is a side sectional view showing a state where a rear wheel is switched to a lower position.

FIG. 4 is a side sectional view of a main part of an injection tube.

FIG. 5 is a sectional view taken along line VV of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Soil 2 Sheet 3 Heat disinfection apparatus 4 Frame 4a Hook 6 minute pipe 7 Injection pipe 7a, 7b Discharge port 8 Branch pipe 9 Supply hose (heating fluid supply device) 10 Traction body (moving device) 12 Handle 13 Front wheel 14 Rear wheel 15 Front bracket 15a to 15c Shaft hole 16 Vertical movement device 17 Rear bracket 17a, 17b Restriction hole 18 Support pin 19 Arm 19a Stop hole 20 Stop pin

Claims (5)

[Claims] An elongated distribution pipe (6) disposed horizontally on the surface of the soil (1), and a number of injection pipes projecting into the soil (1) are provided in the distribution pipe (6). 7) are connected at predetermined intervals in the longitudinal direction, and discharge ports (7a, 7b) are formed at the lower part of each injection pipe (7) to supply hot water or steam to the distribution pipe (6). A heating and disinfecting apparatus for soil, comprising a heating fluid supply device (9) and a moving device (10) for moving the distribution pipe (6) in a direction perpendicular to the longitudinal direction thereof. 2. An apparatus according to claim 1, wherein each injection pipe is inclined rearward and downward with respect to its forward direction. 3. An outlet (7a, 7b) of each injection pipe (7).
3. The soil heating and disinfecting apparatus according to claim 1, wherein the device is provided on a lower surface of the injection pipe (7) and on a side opposite to the advancing surface of the injection pipe (7). 4. The soil disinfection according to claim 1, wherein each injection pipe (7) has a wedge-shaped cross section with a gradually decreasing width from the opposite side to the advance side. apparatus. 5. A front wheel (13) and a rear wheel (14) for supporting a distribution pipe (6) are provided, and the lower end of the rear wheel (14) is higher than the lower end of each of the injection pipes (7). And a vertically moving device (16) for vertically moving between an upper position located at a lower position and a lower position located below a lower end of each of the injection pipes (7). Or the soil heat disinfection device according to 4.