CN202126378U

CN202126378U - Soil moisture transpiration and leakage measurement device

Info

Publication number: CN202126378U
Application number: CN2011202156463U
Authority: CN
Inventors: 刘明义; 徐惠基; 许晓宏; 张瑜
Original assignee: Jilin water and soil conservation science research institute
Current assignee: Jilin water and soil conservation science research institute
Priority date: 2011-06-23
Filing date: 2011-06-23
Publication date: 2012-01-25
Anticipated expiration: 2021-06-23

Abstract

The utility model discloses a soil moisture transpiration and leakage measurement device which comprises a simulated environment box and is characterized in that the soil moisture transpiration and leakage measurement device further comprises a weight box, a pressure sensor, a balanced supporting point and a lever, wherein the lever is placed on the balanced supporting point; the simulated environment box and the weight box are installed and placed on the lever at the two sides of the balanced supporting point; the pressure sensor is installed below the simulated environment box; and in the initial measurement, the lever is in a balanced state, and the pressure sensor is in zero contact with the lever. The variable quantity of the pressure sensor is equal to the ratio of the equivalent lever length from the simulated environment box to the balanced supporting point to the equivalent lever length from the pressure sensor to the balanced supporting point multiplied by the soil moisture evaporation or infiltration quantity in the simulation environment. The soil moisture transpiration and leakage measurement device has the advantages that the variable quantity is plant growth and is not related to the total weight of the soil, so that the measurement accuracy is guaranteed. The soil moisture transpiration and leakage measurement device has the beneficial effects that a measurement mechanism is simple, is easy to process and manufacture and has low cost; the boundary conditions are clear, are easy to meet and have high measurement accuracy; and the real-time automatic detection and the mobile detection are facilitated.

Description

Rising and the seepage measurement mechanism of soil moisture

Technical field

The utility model relates to the rising and seepage measurement mechanism of a kind of soil moisture, belongs to soil detection technique field.

Background technology

Measure the evaporation of plant and soil moisture and the numerical value that infiltrates at present; General hydrology method, meteorology method, the plant physiology method etc. of adopting, the desired boundary condition of these methods is strict, and the component that relates to is a lot; And some component can't be confirmed at all, and the result who is therefore surveyed is also inaccurate.

In order to measure certain regional soil, generally all adopts the way of a plant growth simulation environment of manufacturing at different growing plants, different rainfall amount and the evaporation and the infiltration capacity of moisture in the soil under different sunshine.Near the self-sow environment of plant, the soil water evaporation of plant growth simulation environment is generally all very little with the numerical value that infiltrates, and has only several grams or tens grams sometimes for as far as possible; Need the soil amount of simulated environment generally all to select one to several cubic metres; Weight is several tons to tens tons, on the one hand, and the bulky difficult making of environmental simulation; Cost is high, is not easy to flow detection; On the other hand, the method for directly measuring plant growth simulation environment weight of employing, its measuring error all at several kilograms or tens kilograms, is far longer than measured value, and the result who is surveyed does not almost have practical significance.

Summary of the invention

The utility model discloses a kind of Rising and the seepage measurement mechanism of soil moisture, unclear to solve in the prior art boundary condition, be not easy to satisfy, measuring accuracy is not high; The bulky difficult making of environmental simulation, cost is high, is not easy to problems such as flow detection.

The soil water evaporation that the utility model provides and the measurement mechanism that infiltrates comprise the simulated environment case; It is characterized in that also comprising ballast box, pressure transducer, balanced support point, lever; Lever is placed on the balanced support point; Simulated environment case and ballast box are installed and are positioned on the lever of balanced support point both sides, and pressure transducer is installed in simulated environment case below; Measure when initial, lever is in equilibrium state, and pressure transducer contacts with lever zero.

The utility model counterweigh body equivalent weight comprises ballast box weight and balance weight body weight; Plant growth simulation environmental cabinet equivalent weight comprises simulated environment case weight, the weight of attachment and soil weight.

The utility model counterweigh body equivalent weight equals plant growth simulation environmental cabinet equivalent weight; The counterweigh body equals the equivalent lever length of simulated environment case to balanced support point to the equivalent lever length of balanced support point; The pressure transducer variable quantity equals the ratio of simulated environment case to the equivalent lever length of balanced support point and pressure transducer to the equivalent lever length of balanced support point and multiply by soil water evaporation or infiltration capacity in the simulated environment.

The good effect of the utility model is: variable quantity is exactly the plant growth, and is irrelevant with the general assembly (TW) of soil, guaranteed measuring accuracy.Measuring mechanism is simple, and processing and fabricating is easy, and cost is low; Boundary condition is clear, satisfies easily, measuring accuracy is high; Be convenient to flow detection.The evaporation that is specially adapted to accurately to measure soil moisture in the plant growth simulation environment with the weight differential technique with infiltrate; The evaporation of accurately measuring different plants and soil moisture in research soil and water conservation and the improvement field with infiltrate; Metallurgical geology and coal field are accurately measured the small weight change than the weight body.

Description of drawings

Fig. 1 is the utility model structural representation;

In the drawings: a counterweight boxes, two simulated environmental chamber, three balanced anchor, four pressure sensors;? ?

? counterbalance equivalent body weight,

simulate environmental chamber equivalent weight,

counterweight balancing the body to balance the equivalent length of the lever anchor,

Analog environmental chamber to balance the strong point of the equivalent length of the lever,

anchor the pressure sensor to balance the equivalent length of the lever.

Embodiment

An embodiment of accompanying drawings the utility model.

Figure 1: This embodiment includes a counterweight box 1, box 2 simulation environment, balance support point 3, the pressure sensor 4; lever; equivalent weight balance body weight

including counterweight box a weight and counterweight body weight; plant growth simulation environmental chamber 2 equivalent weight

including simulated environmental chamber 2 weight attachment weight and weight of the soil; equivalent counterweight balancing body weight

is equal to plant growth simulation environments Box 2 equivalent weight

; lever placed on the balance anchor 3; simulated environmental chamber 2 counterweight mounted box with a balance of support points placed on both sides of the lever 3, counterweight balancing the body to balance the equivalent length of the lever anchor is equal to the equilibrium simulation environment anchor box equivalent length of the lever ; pressure sensor 4 is mounted in a simulated environment Box 2 below; initial measurement, the lever is in equilibrium, the pressure sensor 4 is in contact with the lever zero....Pressure sensor is equal to the amount of change to the balance tank simulation environment anchor the equivalent length of the lever

anchor the pressure sensor to balance the equivalent length of the lever by the ratio of the simulated environment of soil moisture evaporation and infiltration.

Measuring principle is following:

Because the coefficient of rolling friction of spring bearing is very little, can ignore, when there was not the soil moisture transpiration in plant growth simulation environment and infiltrates, lever was in equilibrium state:

When having soil and plant generation moisture transpiration in the plant growth simulation environment or infiltrating:

is soil moisture transpiration or the infiltration capacity in the plant growth simulation environment.

When there is the soil moisture transpiration in

and infiltrates for plant growth simulation environment; The variable quantity of LOAD CELLS;

is infiltration capacity, and

is transpiration rate.

Because the formula for

,

,

,

,

are fixed value, when the value

,

When

or

;

; The variable quantity that is LOAD CELLS is exactly soil moisture transpiration or the infiltration capacity in the plant growth simulation environment; Irrelevant with the general assembly (TW) of soil, guaranteed measuring accuracy.

Claims

1. the rising and seepage measurement mechanism of soil moisture comprises the simulated environment case; It is characterized in that also comprising ballast box, pressure transducer, balanced support point, lever; Lever is placed on the balanced support point; Simulated environment case and ballast box are installed and are positioned on the lever of balanced support point both sides, and pressure transducer is installed in simulated environment case below; Measure when initial, lever is in equilibrium state, and pressure transducer contacts with lever zero.

2. the rising and seepage measurement mechanism of soil moisture according to claim 1, it is characterized in that: counterweigh body equivalent weight comprises ballast box weight and balance weight body weight; Plant growth simulation environmental cabinet equivalent weight comprises simulated environment case weight, the weight of attachment and soil weight; Counterweigh body equivalent weight equals plant growth simulation environmental cabinet equivalent weight; The counterweigh body equals the equivalent lever length of simulated environment case to balanced support point to the equivalent lever length of balanced support point; The pressure transducer variable quantity equals the ratio of simulated environment case to the equivalent lever length of balanced support point and pressure transducer to the equivalent lever length of balanced support point and multiply by soil water evaporation or infiltration capacity in the simulated environment.