JPH02234605A - Apparatus for detecting flow of fluid fertilizer - Google Patents

Abstract

PURPOSE:To enable sure detection of the flow and clogged state of fertilizer by placing a vertically movable float in a vertical detection channel formed in a fluid flow channel. CONSTITUTION:Fertilizer is pressed into an upper-side flow channel 21 by operating a fertilizer pump, transferred to a detection channel 23, turns in vertical direction and presses a float from upward. The displacement of the float 24 is proportional to the flow rate. When the float 24 is pressed down by a prescribed distance, a reed switch 34 is turned OFF by a magnet 35 to detect the flow of fertilizer and the float is brought into contact with a lower limit stopper 26. The fertilizer is flowed to the downstream channel after pressing down the float 24. The float 24 is constantly subjected to the flow pressure to enable the sure detection of the presence of flow. When the fertilizer is clogged at the downstream-side of the flow channel, the flow of the fertilizer in the detection channel 23 is stopped, the float is raised by the buoyancy, the reed switch 34 is turned ON to alarm the detection of clogging and the float is brought into contact with an upper limit stopper 25.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a flow detection device for fluid fertilizer that is installed in a fertilizing rice transplanter, etc., and more specifically, the present invention relates to a flow detection device for fluid fertilizer installed in a fertilizing rice transplanter, etc. The present invention relates to a fluid fertilizer flow detection device that is used to detect the flow of fertilizer and the state of clogging.

[Conventional technology]

Generally, a fertilizing device installed in a fertilizing rice transplanter or the like is provided with a flow detection device that detects the flow state of the fertilizer in a flow path of the fluid fertilizer. However, in conventional flow detection devices, the detector is a diaphragm that detects the high pressure in the flow path when fertilizer becomes clogged, so even if a fertilizer clog can be detected, it cannot be determined whether fertilizer is flowing or not. could not be detected.

Therefore, it has been proposed that a high-pressure detection section that operates at high pressure and a low-pressure detection section that operates at low pressure are provided, and the high-pressure detection section detects clogging of fertilizer and the low-pressure detection section detects the presence or absence of fertilizer flow. The flow rate of the liquid fertilizer flowing through the channel is approximately 1 to 5 cc.
/second, so there is a drawback that accurate detection is not possible due to variations in the degree of flexibility of the diaphragm material.Furthermore, the structure is extremely complicated as there are separate detection sections for high pressure and low pressure. There is a problem.

(Problems to be Solved by the Present Invention) The present invention was created based on a novel concept in order to solve the above-mentioned problems, and by utilizing the buoyancy of a float provided in a flow path, An object of the present invention is to provide a fluid fertilizer flow detection device that can accurately detect the presence or absence of fertilizer flow and the clogging state even if the fluid fertilizer flow rate is low.

[Means to solve the problem]

In order to solve the above problems, the technical means taken by the present invention is to form a vertical detection channel in the fluid channel of the fluid fertilizer from the upstream side to the downstream side, and to The present invention is characterized in that a float that can move up and down is provided in the road, and the presence or absence of a flow of fertilizer and the state of clogging are detected by the displacement of the float that moves up and down in response to changes in the flow rate of fertilizer.

[Action of the invention]

Therefore, according to the present invention, when there is no flow of fertilizer, the float in the detection channel formed in the vertical direction rises due to buoyancy. Further, when the fertilizer starts flowing, the fertilizer flowing through the detection channel from the upstream side to the downstream side pushes down the vertically movable float, so the presence or absence of the flow can be detected by the displacement of the float. When fertilizer clogging occurs, the flow of fertilizer stops, and the float rises in the detection flow path due to buoyancy, making it possible to detect fertilizer clogging.

〔Example〕

Next, one embodiment of the present invention will be described in detail based on the attached drawings of a fertilizing rice transplanter. 1 is a running body equipped with front wheels 2 and rear wheels 3, an engine 4 is mounted on the front part of the running body 1, and a driver's seat 5 is provided in the center part. Further, a planting section 9 consisting of a seedling stand 6, a planter 7, a float 8, etc. is attached to the rear of the traveling body 1 via a link 10 so as to be movable up and down.

11 is a fertilizer tank provided at the front of the traveling aircraft 1,
It is connected to a fertilizer pump 13 via a suction pipe 12, and the discharge side of the fertilizer pump 13 is connected to a flow detection device 15 via a pipe 14.

By connecting the detection device 15 to an injection nozzle 16 directed into the soil near the planter 7 via a pipe 17, a fluid flow path of the fertilization device from the fertilizer tank 11 to the injection nozzle 16 is formed. 18 is a valve that cuts off the flow of fertilizer.

As shown in FIG. 3, the detection device 15 is constructed by integrally connecting a lower body 19 and an upper body 20, and the upper body 20 has an upper flow path 2 connected to the pipe 14.
1 is formed in the lower body 19, and a downstream flow path 22 connected to the pipe 17 is formed in the lower body 19.

And from the upper body 20 to the lower body 19,
Both channels 21. 22 is formed in the vertical direction, and the fertilizer from the upper channel 21 flows out to the upper end side of the detection channel 23, and then flows in the vertical direction along the detection channel 23. The detection flow path 23
The water flows out from the lower end of the flow path 22 into the downstream flow path 22.

Reference numeral 24 denotes a vertically movable float provided in the detection channel 23. When fertilizer is not flowing, the float 24 rises due to buoyancy, and when fertilizer is flowing, it moves the detection channel 23 from above to below. It is pushed down by the flowing fertilizer.

A needle-shaped upper limit stopper 25 is provided on the upper surface of the detection channel 23, with which the raised float 24 comes into contact, and a wide upper space is formed above the float 24. A lower limit stopper 26 is provided with which the lowered float 24 comes into contact, so that the lower flow path 22 is always located below the lower surface of the float 24.

A groove 27 is formed in the lower limit stopper 26, and a notch 28 is further provided at the upper peripheral edge of the lower limit stopper 26. Furthermore, a lower groove 29 is carved in the bottom surface of the detection channel 23 at a position corresponding to the groove 27 described above.

The spring 3 fitted on the outer periphery of the lower limit stopper 26
0 supports the float 24. 3
Reference numeral 1 denotes a collar provided on the upper inner surface of the detection passage 23.

Reference numeral 32 denotes a sensor main body provided in the detection flow path 23, the upper end of the sensor main body 32 is fixed to the upper surface of the detection flow path 23 via a fixture 33, and the lower end is connected to the lower limit stopper 26.
is supported by. A reed switch 34 is installed inside the sensor body 32, and when the float 24 moves up and down, a magnet 35 provided on the float 24 electrically operates the reed switch 34 to detect the flow state of the fertilizer. do. That is, when the flow of fertilizer stops and the float 24 is rising due to buoyancy, the reed swing 34 is at rONJ, but the flow of fertilizer causes the float 24 to descend and the displacement L becomes L. When the temperature exceeds s, the magnet 35 activates the Lee IS switch 34 and
OFFJ, the flow stops, the float 24 rises, and L
When passing the s position, turn the reed switch 34 “ON” again.
It is designed to be.

In the above configuration, when the fertilizer is not flowing before starting the work, the float 24 in the detection flow path 23 rises to the upper position shown in No. 11D (7) due to buoyancy.
The reed switch 34 is set to rONJ. and,
When the fertilizer pump 13 is operated to perform fertilization work,
The fertilizer sucked from the fertilizer tank 11 is forced into the upper channel 21 through the pipe 14, reaches the detection channel 23, converts the flow in the vertical direction, and pushes down the float 24 from above. At this time, the amount of displacement of the float 24 is pushed down in proportion to the flow velocity as shown in FIG. The fertilizer that has pushed down the float 24 passes through the side of the float 24 and reaches the lower position as shown in FIG. Since the flow flows into the downstream flow path 22 where the fertilizer flows, the flow pressure due to the flow of fertilizer always acts on the flows 1 and 24, and the presence or absence of the flow can be reliably detected. Since it is operated electrically in a non-contact state, even slight changes in flow velocity can be sensitively detected.

In addition, if fertilizer clogs occur on the downstream side of the flow path,
Since the flow of fertilizer in the detection channel 23 stops, the flows 1 and 24 at the lower position rise due to buoyancy, detect clogging by setting the reed switch 34 to rONJ, and then contact the upper limit stopper 25.

At this time, the fertilizer above the float 24 passes from the wide upper space between the needle-shaped upper limit stop 1 and the brim 250, flows in the direction of arrow (C), and circulates within the detection channel 23.
The float 24 rises smoothly without significant resistance from the fertilizer, and it is possible to quickly detect the occurrence of fertilizer clogging. Furthermore, when cleaning the fertilizer application equipment with high-pressure water, even if the float 24 is pushed down by the high-pressure water,
A groove 27 is formed in the lower limit stopper 26 provided with the notch 28, and a lower groove 29 is carved in the bottom of the detection channel 23, so that high-pressure water can easily flow through and thoroughly clean every corner. Can be done.

〔Effect of the invention〕

In short, the present invention forms a vertical detection channel in the fluid channel of the fluid fertilizer, going from the upstream side to the downstream side of the channel, and also provides a vertically movable float in the detection channel. Since the structure is configured to detect the presence or absence of fertilizer flow and the clogging state by the displacement of the float that moves up and down in response to changes in the flow rate of fertilizer, a vertically movable float is installed in the vertical detection flow path formed in the fluid flow path. Since the flow of fertilizer and the state of clogging can be detected simply by providing a float, the structure of the flow detection device can be extremely simplified. In addition, the fertilizer flowing from the upstream side to the downstream side of the flow moves the float downward, and when the flow stops, the float immediately rises due to buoyancy, so Flow 1 can sensitively detect even the slightest change in the fertilizer flow rate. This makes it possible to reliably detect the flow of fertilizer and the state of clogging.

[Brief explanation of the drawing]

The drawings show an embodiment of the fluid fertilizer flow detection device according to the present invention, in which FIG. 1 is a sectional view showing the operating state, FIG. Figure 3 is a sectional view of the body, Figure 4 is a view taken in the direction of arrow B in Figure 3, Figure 5 is a sectional view taken along line CC in Figure 4, Figure 6 is a side view of the sensor body, Figure 7
Figure 8 is a side view of the fertilizing rice transplanter, Figure 8 is a plan view of the same as above, Figure 9 is a chart showing the relationship between the displacement amount and flow rate of flow 1, and Figure 11 is a diagram showing the relationship between displacement and flow rate of flow 1.
The figure is a chart showing the amount of displacement of the float and the operating state of the reed switch. In the figure, 21... upper side flow path, 22... lower side flow path,
23...Detection channel, 24...Float. Procedural amendment (formality) 1. Case Description 1999 Patent Application No. 54824 2. Name of the invention: Fluid fertilizer flow detection device 3. Relationship with the case of the person making the amendment Patent applicant address 667-1 Oaza Iya-cho, Higashiizumo-cho, Yatsuka-gun, Shimane Prefecture
Name (187) Mitsubishi Agricultural Machinery Co., Ltd. Representative Keita Fuchida 4. Agent〒112 5. Date of amendment order (May 30, 1999) 6. "Brief explanation of drawings" column of the specification subject to amendment 7. Contents of amendment

Claims (1)

[Claims] In the fluid flow path of the fluid fertilizer, a vertical detection flow path is formed from the upper side to the lower side of the flow path, and a float that can move up and down is provided in the detection flow path to respond to changes in the flow rate of the fertilizer. 1. A flow detection device for fluid fertilizer, characterized in that it is configured to detect the presence or absence of a flow of fertilizer and the state of clogging by the displacement of a float that moves up and down.