CN204989174U - Be used for measuring soil compacting test platform - Google Patents
Be used for measuring soil compacting test platform Download PDFInfo
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- CN204989174U CN204989174U CN201520584873.1U CN201520584873U CN204989174U CN 204989174 U CN204989174 U CN 204989174U CN 201520584873 U CN201520584873 U CN 201520584873U CN 204989174 U CN204989174 U CN 204989174U
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- soil
- tire
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- stress
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Abstract
The utility model discloses a belong to a be used for measuring soil compacting test platform of agriculture farming technique scope, this test platform sets up the soil box at a soil within range, and the soil box size is tire - soil contact trace, when laying the sensor in the soil box, lays according to becoming " right angle " respectively along two orientations in tire walking orientation and the perpendicular to tire walking orientation, discloses tire - soil contact distributing of stress law through answer the force measurement to two orientation soil, through the section to being surveyed soil, measure different degree of depth soil layer stress intensities to revea soil stress transfer law, the utility model discloses an experiment is accomplished under the agricultural machine operational environment of field, and true, the objective embodiment agricultural machine of experimental enviroment is to the field soil condition of rolling. Carried out the simplification analysis to soil stress state, made complicated soil stress state become and simply easily summarize the law.
Description
Technical field
The utility model belongs to agricultural cultivating technology scope, particularly a kind of test platform for measuring soil compression.
Background technology
In recent years, along with the further enforcement of China's the allowance for purchasing agricultural machinery and land transformation policy, the big-and-middle-sized agricultural machinery recoverable amount of China continues to rise, and substantially increase agricultural production efficiency, agricultural mechanized processes has had significant progress.These big-and-middle-sized agricultural machinery are at field work, and spoiled soil structure while improving operating efficiency, causes soil compression, affect soil sustainable development.
From the eighties in 20th century, China starts the research carrying out agricultural land soil compacting aspect, through decades of research, has summed up soil physical property Changing Pattern in soil compression process qualitatively, and it is slower to carry out the progress of quantitative expression to soil compression.Because the conditions such as different regions soil types, soil moisture content are different, agricultural machinery is also different to soil packing effect result, so need to invent a kind of method measuring soil compression, carrys out quantitative measurment soil compression.
Utility model content
The purpose of this utility model provides a kind of test platform for measuring soil compression for the deficiencies in the prior art, it is characterized in that, this test platform is arranging soil box along tire direction of travel with perpendicular within the scope of tire direction of travel lastblock soil, lay strain gauge in the soil box that 10cm is dark, for measuring tire-soil contact stress distribution; Arrange a soil profile, on this soil profile, and at tire walking position, lay strain gauge successively from top to bottom, for measuring different depth soil STRESS VARIATION.
The soil profile of described soil profile is made into depth H to be 1m, length L be 1.2m.
Described strain gauge refers to that a kind of volume is the sensor of the smaller size smaller of φ 10mm × 15mm, for measuring the sensor of stress intensity, is made up of the capacitance type sensor of hard iron and steel shell and inside; The data recorded are connected to PC by signal amplifier and data collecting card.
In described soil box, the lay of strain gauge is along in tire direction of travel soil box, at least lay 5 strain gauges; Between every two strain gauges, interval is more than or equal to 5cm; 5 sensors are laid in the soil box perpendicular to tire direction of travel, sensor distance distance determines as measuring vertical direction Stress transmit according to tire-soil contact trace width, strain gauge fitting depth on soil profile is respectively 10cm, 30cm, 50cm, 70cm, 90cm, is namely be spaced apart 20cm between strain gauge.
The utility model beneficial effect is compared with the prior art, under the condition of field test, the stress produced tire in agricultural machinery working process-soil interaction by the strain gauge buried underground is in the transmission situation of vertical direction, and measure in tire-soil contact stress distribution situation, thus disclose tire-soil contact stress distribution law and soil stress transferring rule; Have the following advantages: 1, experiment completes under the agricultural working machine environment of field, experimental situation really, objectively embodies agricultural machinery and rolls situation to field soil.2, taken into full account the experimental error caused because of soil treatment or sensor lay when sensor is installed, top layer 10cm soil is well backfilling and compacted original soil conditions and tests by the placement that keeps at a certain distance away between sensor, sensor distance profile certain distance, sensor lay when section is installed afterwards.3, on the basis of great many of experiments, carry out data analysis, Function Fitting, ensure that the accuracy of result; Carry out simplifying analyzing to soil stress state, complicated soil stress state has been become and is simply easy to Rule Summary.
Accompanying drawing explanation
Fig. 1 is that measurement of the present utility model tire-soil contact stress distribution soil box is arranged and sensor scheme of installation
Fig. 2 is soil profile and sensor mounting means schematic diagram
What Fig. 3 was hole method sensor installation schematic diagram
Fig. 4 is soil stress state analysis schematic diagram, wherein a) represents arbitrarily angled soil stress state analysis schematic diagram; B) soil normal stress analyzes schematic diagram; C) soil compressive stress analyzes schematic diagram.
Fig. 5 is that sensor is formed and data transmission schematic diagram
Embodiment
The utility model provides a kind of test platform for measuring soil compression, is explained below in conjunction with accompanying drawing.
As shown in Figure 1, this test platform arranges soil box in experimental plot, is used for measuring tire-soil contact stress distribution situation.Concrete grammar is being disposed by the topsoil of more than soil 10cm in certain area along tire direction of travel, and form soil box, soil box is of a size of tire-soil contact footprint size, and the degree of depth is 10cm; Strain gauge is routed in the middle of soil box successively, along tire direction of travel, at least lay 5 strain gauges, interval 50mm between every two strain gauges, in case strain gauge distance too recent photo sound soil stress, and the arrangement of strain gauge will in the centre of soil box, so that agricultural machinery when walking, under the help of radar, tire central row is walked on strain gauge arranging line; Perpendicular to tire direction of travel, when laying sensor in soil box, lay 5 strain gauges, strain gauge spacing determines according to tire-soil contact trace width, strain gauge laying is complete to be backfilling in the middle of soil box by the soil disposed, and is compacted to soil virgin state.Both direction is comprised to soil-tire contact plane stress measurement: along tire direction of travel with perpendicular to tire direction of travel.
As shown in Figure 2, on the vertical plane of soil profile, by the method for holing, sensor is installed in the middle of soil by soil profile, in order to avoid soil profile is on the impact of soil Stress transmit; In distance soil profile 50cm depth (as shown in Figure 3), from the distance soil surface 10cm degree of depth, by sensor from top to bottom successively interval 20cm embed in soil, namely at 10cm, 30cm, 50cm, 70cm, 90cm place mount stress sensor; Object is to measure soil stress transferring rule.
Shown in Fig. 4, soil stress state is simplified by the basis of soil stress state as far as possible, to broadcast that medium is idealized as far as possible to carry out theoretical analysis (soil stress state analysis schematic diagram as shown in Figure 4, wherein a) represents arbitrarily angled soil stress state analysis schematic diagram; B) soil normal stress analyzes schematic diagram; C) soil compressive stress analyzes schematic diagram):
I
1=σ
x+ σ
y+ σ
z=σ
1+ σ
2+ σ
3in this formula, σ
xσ
yσ
zrepresent arbitrarily angled soil stress, σ
1σ
2σ
3represent normal stress;
I
2＝σ
xσ
y+σ
xσ
z+σ
yσ
z-τ
2 xy-τ
2 xz-τ
2 yz＝σ
1σ
2+σ
1σ
3+σ
2σ
3，
I
3＝σ
xσ
yσ
z+2τ
xyτ
xzτ
yz-σ
xτ
2 yz-σ
yτ
2 xz-σ
zτ
2 xy＝σ
1σ
2σ
3，
Wherein
represent soil compressive stress; σ represents σ
x, σ
y, σ
z, σ
1, σ
2, σ
3general name;
V is soil stress transmission coefficient, needs to be summarized by lot of experimental data, and lot of experimental data, by the curve of data software, solves soil stress transmission coefficient;
R is the air line distance of tire-soil contact center to soil testing point;
I
1i
2i
3for stress invariant, the amount do not changed with the selection of coordinate;
θ is soil testing point and tire-soil contact line of centres and the perpendicular line angle through center.
As shown in Figure 5, soil strain gauge refers to the sensor can measuring stress intensity of a kind of small volume (being about φ 10mm × 15mm), be made up of the capacitance type sensor of hard iron and steel shell and inside, the data recorded are connected to PC by signal amplifier and data collecting card, sensor be dynamic pickup can real-time and accurately by agricultural machinery in soil compression process, test point STRESS VARIATION situation presents, more directly monitoring soil compression situation.
Under the condition of field test, by the strain gauge buried underground to the stress of the vertical direction that tire in agricultural machinery working process-soil interaction produces and measure in tire-soil contact stress distribution situation; By the section to tested soil, measure different depth soil layer stress intensity, thus disclose tire-soil contact stress distribution law and soil stress transferring rule.
Claims (4)
1. one kind for measuring the test platform of soil compression, it is characterized in that, this test platform is arranging soil box along tire direction of travel with perpendicular within the scope of tire direction of travel lastblock soil, lay strain gauge in the soil box that 10cm is dark, for measuring tire-soil contact stress distribution; Arrange a soil profile, on this soil profile, and at tire walking position, lay strain gauge successively from top to bottom, for measuring different depth soil STRESS VARIATION.
2. a kind of test platform for measuring soil compression according to claim 1, is characterized in that, the soil profile of soil profile is made into depth H to be 1m, length L be 1.2m.
3. a kind of test platform for measuring soil compression according to claim 1, it is characterized in that, strain gauge refers to that a kind of volume is the sensor of the smaller size smaller of φ 10mm × 15mm, for measuring the sensor of stress intensity, be made up of the capacitance type sensor of hard iron and steel shell and inside; The data recorded are connected to PC by signal amplifier and data collecting card.
4. a kind of test platform for measuring soil compression according to claim 1, it is characterized in that, for measuring wheel tire-soil contact stress distribution law, in soil box, the lay of strain gauge is divided into along tire direction of travel with perpendicular to tire direction of travel, along tire direction of travel interval lay at least 5 strain gauges, between every two strain gauges, interval is more than or equal to 5cm; Perpendicular to tire direction of travel, number laid by sensor is 5, and between sensor, spacing is determined according to interface width; For measuring vertical direction Stress transmit, the strain gauge fitting depth on soil profile is respectively 10cm, 30cm, 50cm, 70cm, 90cm, is namely be spaced apart 20cm between strain gauge.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520584873.1U CN204989174U (en) | 2015-08-05 | 2015-08-05 | Be used for measuring soil compacting test platform |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520584873.1U CN204989174U (en) | 2015-08-05 | 2015-08-05 | Be used for measuring soil compacting test platform |
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| CN204989174U true CN204989174U (en) | 2016-01-20 |
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| CN201520584873.1U Expired - Fee Related CN204989174U (en) | 2015-08-05 | 2015-08-05 | Be used for measuring soil compacting test platform |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160120 Termination date: 20160805 |
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| CF01 | Termination of patent right due to non-payment of annual fee |