CN201242521Y - Apparatus for measuring soil pervasion parameter - Google Patents

Abstract

The utility model relates to a device for measuring soil permeability parameters, which comprises a soil holding groove and a water holding tank; wherein, the soil holding groove is arranged on the water holding tank, the periphery of the soil holding groove is connected through a sealing gasket to prevent seepage, infiltration holes are arranged at the bottom of the soil holding groove, a plurality of instrument probe holes are arranged on the side walls of the soil holding groove, a plurality of TDR soil moisture sensors are positioned in the soil filled in the soil holding groove through the instrument probe holes, and the detection signals of the TDR soil moisture sensors are transmitted to a monitoring computer through a singlechip or a converter. The device for measuring soil permeability parameter has the advantages that the installation, maintenance and operation are simple and convenient, the service life is long, the measuring accuracy is high, and the stability is high, and the measurement is not influenced by the soil type.

Description

A Measuring Device for Soil Infiltration Parameters

technical field

The utility model relates to a technique for measuring soil water infiltration by artificial water supply in the field of plant ecology, in particular to a measuring device for soil infiltration parameters.

Background technique

At present, the devices for measuring soil infiltration parameters mainly use the principle of surface water infiltration, and most of them are water supply devices that maintain the depth of surface water at a fixed value after system design. Such devices use a lot of water when measuring, and the distribution is uneven. If natural precipitation is used to measure soil infiltration parameters, precipitation amount, precipitation time, and precipitation intensity must be considered. It is not easy to obtain the soil infiltration parameters needed for scientific research or more quickly.

Moisture is the main factor determining the dielectric constant of soil. Measuring the dielectric constant of soil can directly and stably reflect the true moisture content of various soils. Soil moisture is an important part of soil and plays a very important role in crop growth and water-saving irrigation. By systematically grasping the distribution of soil moisture (moisture), it provides a scientific basis for differentiated water-saving irrigation. At the same time, accurate water supply is also conducive to improving crop yield and quality.

Utility model content

Aiming at the above-mentioned deficiencies in the prior art, the technical problem to be solved by the utility model is to provide a measuring device for soil infiltration parameters.

In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is:

The utility model relates to a soil seepage parameter measuring device, which has a soil holding tank and a water storage tank, wherein the soil holding tank is arranged on the water storage tank, and the periphery of the soil storage tank is connected by a sealing pad to prevent leakage. There are multiple instrument probe holes on the wall, and multiple TDR soil moisture sensors are placed in the soil of the soil tank through the instrument probe holes, and the detection signals of the TDR soil moisture sensors are connected to the monitoring computer through a single-chip microcomputer and a converter.

The upper opening of the water tank is provided with a load-bearing belt; the lower part of the water tank is provided with a drain valve; the bottom of the water tank is equipped with an instrument rack.

The utility model has the following beneficial effects and advantages:

1. Easy to install and maintain. The utility model adopts the detachable structure of the soil storage tank and the water storage tank, and the soil storage tank is provided with an instrument probe hole, which is easy to install and maintain.

2. Long service life. The water tank of the utility model is made of plexiglass, the instrument frame adopts epoxy resin as a supporting material, and the upper opening of the water tank is provided with a load-bearing belt, so that the strength and service life are guaranteed.

3. High measurement accuracy. The soil moisture sensor of the present utility model adopts an effective measuring length of 600 mm. To make the effective measuring length all be installed in the soil holding tank, the part other than the effective measuring length of 600 mm must also be installed in the soil holding tank for 30 mm during installation, so that The total length of the installed soil moisture sensor in the soil tank is 630mm, so that the effective measurement part can be used to the best extent, making the accuracy more accurate;

4. High stability. The utility model adopts the TDR soil moisture sensor product produced by the American automation company, and the test proves that this product is the most reliable and stable soil moisture sensor in the system measurement, and it is the first choice here.

5. The measurement is not affected by soil type.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the utility model;

Fig. 2 is a schematic diagram of the split structure of the utility model.

Detailed ways

As shown in Figures 1 and 2, the utility model is a measuring device for soil infiltration parameters, which has a soil tank 1 and a water tank 2 made of plexiglass, wherein the soil tank 1 is arranged on the water tank 2, and the water tank 2 consists of an instrument rack. 6 (this embodiment uses epoxy resin) support, the periphery of the contact part of the soil holding tank 1 and the water holding tank 2 is fastened and connected by the gasket 3 through the screw 7, the bottom of the soil holding tank 1 is provided with a water seepage hole 4, and the side of the soil holding tank 1 The wall is provided with instrument probe holes 8, and a plurality of TDR soil moisture sensors 9 are respectively placed in the soil 10 of the soil holding tank 1 through different instrument probe holes 8 (using 10 TDR soil moisture sensors 9 in this embodiment), and the TDR soil moisture sensors The detection signal of moisture sensor 9 is connected to monitoring computer 14 through single-chip microcomputer 12 and converter 13; The bottom of the water tank 2 is provided with a drain valve 5 .

The working voltage of the TDR soil moisture sensor 9 is DC12v, and it outputs a signal of 4-20mA. The length of the effective part of the measured soil is >600mm, and the length of the part close to the cable is <100mm. The TDR soil moisture sensor 9 must be in close contact with the soil to ensure that the soil is filled With full sensors, the distance between the sensors is about 100mm, keeping them parallel. An optional method is to inject the mud made with local soil in advance along the instrument probe hole 8 of the TDR soil moisture sensor 9, and then insert the sensor. This slurry will fill the gap between the sensor and the soil. The level sensor will be installed in the soil sump and the mouth sealed with sealant.

When in use, the external waterer 11 is used to artificially supply water according to the required soil infiltration parameters, time and amount. When the water enters the soil in the soil holding tank 1, the soil infiltration starts, and the water supply should be stopped when the soil water content reaches saturation. At this time, water flows into the water tank 2 through the water seepage hole 4 through the soil, and finally flows out through the drain valve 5 for testing. This model adopts the structure of sealing gasket 3 and fixing screw 7, and the sealing effect is better. The measurement system is completed by the TDR soil moisture sensor 9, and the measurement signal is sent to the monitoring computer 14 through the converter 13 of the single chip microcomputer 12.

Moisture is the main factor determining the dielectric constant of soil. The TDR soil moisture sensor measures the dielectric constant of the soil and directly and stably measures the true moisture content of various soils. In agriculture and forestry, the signal output of the sensor can be used to directly control irrigation. For example: when the soil is dry, a warning signal can automatically sound to remind people that it is time to irrigate. The automatic control system can switch water pumps and valves, etc. With some additional sensors, it may be possible to calculate soil moisture evaporation and moisture parameters required by crops. TDR can measure the volume percentage of soil moisture, independent of the soil's own mechanism.

Claims (4)

1. the measurement mechanism of a soil permeability parameter, it is characterized in that: have earth-containing groove (1) and water box (2), wherein earth-containing groove (1) is located on the water box (2), for the antiseep periphery connects by sealing gasket (3), earth-containing groove (1) bottom land is provided with infiltration hole (4), earth-containing groove (1) sidewall is provided with a plurality of instrument probe hole (8), a plurality of TDR soil moisture sensors (9) place the soil (10) of earth-containing groove (1) by instrument probe hole (8), and the detection signal of TDR soil moisture sensor (9) is connected to supervisory control comuter (14) by single-chip microcomputer (12) and converter (13).

2. by the measurement mechanism of the described soil permeability parameter of claim 1, it is characterized in that: water box (2) top opening is provided with load-bearing band (15).

3. by the measurement mechanism of the described soil permeability parameter of claim 1, it is characterized in that: described water box (2) bottom is provided with water drain valve (5).

4. by the measurement mechanism of the described soil permeability parameter of claim 1, it is characterized in that: described water box (2) bottom is equipped with instrument stand (6).