CN102680346A - High-precision lever type weighing lysimeter based on spring balance - Google Patents
High-precision lever type weighing lysimeter based on spring balance Download PDFInfo
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- CN102680346A CN102680346A CN2012101239025A CN201210123902A CN102680346A CN 102680346 A CN102680346 A CN 102680346A CN 2012101239025 A CN2012101239025 A CN 2012101239025A CN 201210123902 A CN201210123902 A CN 201210123902A CN 102680346 A CN102680346 A CN 102680346A
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Abstract
The invention discloses a high-precision lever type weighing lysimeter based on spring balance. The high-precision lever type weighing lysimeter comprises a first fulcrum, a second fulcrum is arranged above one side of the first fulcrum diagonally, a soil box is arranged above the other side of the first fulcrum diagonally, an elastic support is arranged at the bottom of the soil box, a first lever is mounted on the first fulcrum, a second lever is mounted on the second fulcrum, an end of a moment arm of the first lever is rigidly connected with the bottom of the soil box, a first counter weight is mounted on the moment arm on one side of the first lever, an end of the first lever is connected with the second lever via a connecting rod, a second counter weight is also mounted on a moment arm, which is connected with the connecting rod, of the second lever, and a moment arm on the other side of the second lever is connected with a weighing sensor. Compared with the prior art, the high-precision lever type weighing lysimeter based on spring balance can precisely measure water variation of soil.
Description
Technical field
The invention belongs to water conservancy scientific research apparatus technical field, be specifically related to a kind of high precision lever lysimeter of weighing based on spring balancing.
Background technology
Existing Weighing Lysimeter can be divided into fluid pressure type, mechanical type, electronic type etc.; It all requires the volume and weight of the measured soil body big; Then the moisture general assembly (TW) is big in the soil body, and since in the mensuration process in the soil body to be measured the actual change amount of moisture smaller, utilize the determinator of wide region to remove the variation characteristic of experiencing less; Be difficult to obtain the mensuration of degree of precision, this also is the basic reason that existing Weighing Lysimeter is difficult to obtain the measuring accuracy of needs.
Summary of the invention
The purpose of this invention is to provide a kind of high precision lever lysimeter of weighing, compared with prior art, can realize the soil body change of soil water content quantitative determination of degree of precision based on spring balancing.
The technical scheme that the present invention adopted is, a kind of high precision lever based on spring balancing lysimeter of weighing is characterized in that; Comprise first fulcrum; The one skew back top of first fulcrum is provided with second fulcrum, and the opposite side oblique upper of first fulcrum is provided with the native case that is used to place the soil body to be measured, and the bottom of native case is provided with the elastic supporting member for supporting optical member of vertical direction; First lever is installed on first fulcrum; Second lever is installed on second fulcrum, and the end of first lever, one arm of force and the bottom of native case are rigidly connected, and on first lever, the one side force arm first balancing weight are installed and the end is connected with second lever through connecting link; Be connected with on second lever on the arm of force of connecting link second balancing weight also is installed, be connected with LOAD CELLS on the opposite side arm of force of second lever.
Connecting link is the vertical direction setting.
Second balancing weight and LOAD CELLS lay respectively at the end of two arm of forces of second lever.
Elastic supporting member for supporting optical member comprises equally distributed a plurality of support spring, and the bottom of each support spring all is fixed on the lower plate, and the top of each support spring all is fixed on the train wheel bridge, and native case is placed on the train wheel bridge and through this train wheel bridge and is connected with first lever.
All be welded with vertical inner core on the train wheel bridge on the fixed position of corresponding support spring; The inside that is positioned at inner core on the train wheel bridge has air hole; Each support spring is arranged in the corresponding inner core, and the inwall fixed connection of the bottom of each support spring and corresponding inner core, all is welded with on the fixed position of corresponding support spring on the lower plate vertically to urceolus; Each urceolus is arranged on the outside of corresponding inner core, all is marked with lubricating fluid in each urceolus.
The both ends of connecting link all are equipped with blade, and first lever all is equipped with the cutter holder that matches with said blade with the position that second lever is connected with connecting link.
The present invention has changed the basic structure of existing Weighing Lysimeter; Elastic supporting member for supporting optical member is set to constitute the elastic equilibrium load bearing system below native case; Can fall the weight of solid in the soil body to be measured is in a basic balance; Utilize the lever transmission system of formations such as first lever and second lever that the subtle change of moisture weight in the soil body to be measured is transmitted out again, adopt LOAD CELLS to measure the loads change of second lever end output.
The invention has the beneficial effects as follows: features simple structure, cost of manufacture is low, the soil body change of soil water content quantitative determination that can realize degree of precision easy to use.
Description of drawings
Fig. 1 is the weigh structural representation of lysimeter of the high precision lever that the present invention is based on spring balancing;
Fig. 2 is the wiring layout of train wheel bridge among the present invention, support spring and lower plate;
Fig. 3 is the data processing equipment block diagram that the present invention uses;
Fig. 4 is the force analysis figure of the present invention's first lever and second lever.
Wherein, 1. support spring, 2. first lever, 3. first fulcrum, 4. first balancing weight, 5. connecting link; 6. urceolus, 7. inner core, 8. lubricating fluid, 9. second lever, 10. second balancing weight; 11. train wheel bridge, 12. lower plates, 13. air holes, 14. second fulcrums, 15. LOAD CELLSs; 16. native case, 17. data acquisition units, 18. signal conversion units, 19. signal processing units, 20. display units.
Embodiment
As shown in Figure 1; The high precision lever that the present invention is based on spring balancing lysimeter of weighing; The opposite side oblique upper that the skew back top that comprises first fulcrum, 3, the first fulcrums 3 is provided with second fulcrum, 14, the first fulcrums 3 is provided with the native case 16 that is used to place the soil body to be measured.The bottom of soil case 16 is provided with the elastic supporting member for supporting optical member of vertical direction.First lever 2 is installed on first fulcrum 3.Second lever 9 is installed on second fulcrum 14.The end of first lever, 2 one arm of forces and the bottom of native case 16 are rigidly connected, and on first lever, the 2 one side force arms first balancing weight 4 are installed and the end is connected with second lever 9 through connecting link 5, and connecting link 5 is the vertical direction setting.Be connected with on second lever 9 and be connected with the end that LOAD CELLS 15, the second balancing weights 10 and LOAD CELLS 15 lay respectively at two arm of forces of second lever 9 on the opposite side arm of force that second balancing weight, 10, the second levers 9 also are installed on the arm of force of connecting link 5.
As shown in Figure 2; Elastic supporting member for supporting optical member comprises a plurality of support springs 1 of even setting; The bottom of each support spring 1 all is fixed on the lower plate 12, and the top of each support spring 1 all is fixed on the train wheel bridge 11, and native case 16 is placed on the train wheel bridge 11 and through this train wheel bridge 11 and is connected with first lever 2.All be welded with vertical inner core 7 on the fixed position of corresponding each support spring 1 on the train wheel bridge 11; The inside that is positioned at each inner core 7 on the train wheel bridge 11 all has air hole 13; Each support spring 1 is arranged in the corresponding inner core 7, and the inwall fixed connection of the bottom of support spring 1 and corresponding inner core 7, all is welded with on the fixed position of corresponding support spring 1 on the lower plate 12 vertically to urceolus 6; Each urceolus 6 is arranged on the outside of corresponding inner core 7, all is marked with lubricating fluid 8 in each urceolus 6.Corresponding inner core 7 is with urceolus 6 and lubricating fluid wherein 8 can effectively reduce owing to concussion, temperature variation and air and support spring 1 generation galvanic corrosion etc. reach good stable and damping effect to the influence of support spring 1 through moisture.
The both ends of connecting link 5 all are equipped with blade, and first lever 2 all is equipped with the cutter holder that matches with said blade with the position that second lever 9 is connected with connecting link 5.Because the volume and weight of the soil body to be measured is big generally speaking; And the change of soil water content amount of required measurement is very little; Then require the present invention can bear big load and measuring accuracy height and susceptibility and want high; Therefore first lever 2 and second lever 9 are all accepted the transmission of carrying out power mutually with the form of blade, cutter holder with connecting link 5, and holder is that line contacts with cutter owing to blade, rather than the contact of traditional face; Like this can be effectively contact point be remained on a constant basically length range to the distance of fulcrum, thereby reduce the systematic error that the change in location because of stress point is caused the lever transmission system.
As shown in Figure 3, the present invention is connected with data processing equipment in use on LOAD CELLS 15.Data processing equipment comprises the data acquisition unit 17 that is connected with LOAD CELLS 15; Be connected with the signal conversion unit 18 that is used for simulating signal is transferred to digital signal on the data acquisition unit 17; Be connected with the signal processing unit 19 that is used to calculate soil body change of soil water content amount to be measured on the signal conversion unit 18, be connected with display unit 20 on the signal processing unit 19.
Among the present invention; Support spring 1, urceolus 6, inner core 7, train wheel bridge 11 and lower plate 12 be common to constitute the elastic equilibrium load bearing systems, and first lever 2, first fulcrum 3, first balancing weight 4, connecting link 5, second lever 9, second fulcrum 14 and second balancing weight 10 constitute the lever transmission systems.Generally speaking; The volume and weight of soil sample to be measured is big; Rise the subtle change amount of sending out or infiltrating every day in order to measure soil sample to be measured, at first utilize the elastic equilibrium load bearing system to fall the weight of solid in the soil body is in a basic balance, stay less weight by first lever, 2 balances; The anchorage force that first lever 2 gives the soil body to be measured is provided by first balancing weight 4, and first lever 2 is connected with connecting link 5, and when soil body weight change to be measured, the weight of this variation is then by connecting link 5 balances; Passing to power 9 last times of second lever; Second balancing weight 10 presets to initial stressed of 15 1 of LOAD CELLSs; And this second lever 9 is connected with connecting link 5; When power suffered on the connecting link 5 changes, then the power of this variation will pass to LOAD CELLS 15, and LOAD CELLS 15 converts original mechanical quantity into electric weight; The simulating signal of exporting according to weighing and sensing 15 through data processing equipment at last obtains soil body change of soil water content amount to be measured.
Duty initialization of the present invention: the output valve that LOAD CELLS 15 produces because of two balancing weights is demarcated and is the benchmark zero point of stressed size.
As shown in Figure 4, measuring principle of the present invention is observed the stress balance principle:
System sets at first:
Soil body dynamic balance to be measured: P=nF+ ε P,
Spring pedestal connects lever stress: ε P * X=G * Y,
It is stressed to connect sensor lever: G` * Y`=R * Z`,
When the soil body to be measured is risen outbreak usefulness or extraneous moisturizing, produce Δ P, at this moment,
Soil sample variable quantity dynamic balance: Δ P=Δ ε P,
Spring pedestal connects lever stress to be changed: Δ ε P * X=T * Z,
Connect the stressed variation of sensor lever: T` * X`=Δ R * Z`,
Wherein, P is the former weight of the soil body to be measured; F is the anchorage force of each support spring 1; ε P is the anchorage force of first lever 2;
G and G` are respectively the weight of first balancing weight 4 and second balancing weight 10; R is LOAD CELLS 15 initial stressed; N is the quantity of support spring 1;
Δ P is that the soil body to be measured oozes the weight change that produces because steam; Δ ε P is that the anchorage force that first lever 5 provides changes size;
T is the stressed size on the connecting link 5; T` and T be acting force and reacting force each other;
Δ R is the stressed variation size of LOAD CELLS 15; X is the distance of power ε P to fulcrum;
Y is that the power G that produces of first balancing weight 4 is to pivot distance;
Y` is the distance of the power G` of second balancing weight, 10 generations to fulcrum;
Z` is the distances of LOAD CELLS 15 stress points to fulcrum;
X` is the distance of the point that is connected with first lever 2 of connecting link 5 to fulcrum;
Z is the distance of the point that is connected with first lever 2 of connecting link 5 to fulcrum;
Record Δ R, just can instead release Δ P, send out or variable quantity that extraneous moisturizing effects causes the weight of the soil body to be measured to change, reach the effect of measuring steaming milliosmolarity size variation with this thereby release because of rising.
Claims (6)
1. the high precision lever based on spring balancing lysimeter of weighing; It is characterized in that; Comprise first fulcrum (3); The one skew back top of said first fulcrum (3) is provided with second fulcrum (14), and the opposite side oblique upper of said first fulcrum (3) is provided with the native case (16) that is used to place the soil body to be measured, and the bottom of said native case (16) is provided with the elastic supporting member for supporting optical member of vertical direction; First lever (2) is installed on said first fulcrum (3); Second lever (9) is installed on said second fulcrum (14), and the end of said first lever (2) one arm of forces and the bottom of native case (16) are rigidly connected, and on said first lever (2) the one side force arms first balancing weight (4) are installed and the end is connected with second lever (9) through connecting link (5); Be connected with on said second lever (9) on the arm of force of connecting link (5) second balancing weight (10) also is installed, be connected with LOAD CELLS (15) on the opposite side arm of force of said second lever (9).
2. according to the described high precision lever of claim 1 lysimeter of weighing, it is characterized in that said connecting link (5) is the vertical direction setting based on spring balancing.
3. according to claim 1 or the 2 described high precision levers lysimeter of weighing, it is characterized in that said second balancing weight (10) and LOAD CELLS (15) lay respectively at the end of two arm of forces of second lever (9) based on spring balancing.
4. according to claim 1 or the 2 described high precision levers lysimeter of weighing based on spring balancing; It is characterized in that; Said elastic supporting member for supporting optical member comprises equally distributed a plurality of support spring (1); The bottom of said each support spring (1) all is fixed on the lower plate (12), and the top of said each support spring (1) all is fixed on the train wheel bridge (11), and said native case (16) is placed on train wheel bridge (11) and upward and through this train wheel bridge (11) is connected with first lever (2).
5. according to the described high precision lever of claim 4 lysimeter of weighing based on spring balancing; It is characterized in that; All be welded with vertical inner core (7) on the fixed position of the last corresponding support spring (1) of said train wheel bridge (11); The inside that is positioned at inner core (7) on the said train wheel bridge (11) has air hole (13); Said each support spring (1) is arranged in the corresponding inner core (7), and the bottom of each support spring (1) is fixedly connected with the inwall of corresponding inner core (7), all is welded with vertically to urceolus (6) on the fixed position of corresponding support spring (1) on the said lower plate (12); Said each urceolus (6) is arranged on the outside of corresponding inner core (7), all is marked with lubricating fluid (8) in said each urceolus (6).
6. according to claim 1 or the 2 described high precision levers lysimeter of weighing based on spring balancing; It is characterized in that; The both ends of said connecting link (5) all are equipped with blade, and said first lever (2) all is equipped with the cutter holder that matches with said blade with the position that second lever (9) is connected with connecting link (5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210123902.5A CN102680346B (en) | 2012-04-10 | 2012-04-10 | High-precision lever type weighing lysimeter based on spring balance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210123902.5A CN102680346B (en) | 2012-04-10 | 2012-04-10 | High-precision lever type weighing lysimeter based on spring balance |
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| CN102680346A true CN102680346A (en) | 2012-09-19 |
| CN102680346B CN102680346B (en) | 2014-04-16 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103091197A (en) * | 2013-01-15 | 2013-05-08 | 甘肃省气象局 | Weighing steam infiltration meter |
| CN109342259A (en) * | 2018-11-30 | 2019-02-15 | 河北建筑工程学院 | A kind of lever lysimeter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2152214Y (en) * | 1993-04-29 | 1994-01-05 | 黑龙江省水利科学研究所 | Weighing type measuring instrument for soil water content evapouration and distribution |
| CN201045587Y (en) * | 2007-06-15 | 2008-04-09 | 武汉科恒工控工程有限责任公司 | Device for improving weighing precision of weightless balance |
| DE202009000642U1 (en) * | 2009-01-20 | 2009-03-19 | Ums Gmbh | Lysimeter with a device for mechanical separation of the snow loading |
| CN202649069U (en) * | 2012-04-10 | 2013-01-02 | 西安理工大学 | High-precision lever type weighing lysimeter system based on spring balance |
-
2012
- 2012-04-10 CN CN201210123902.5A patent/CN102680346B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2152214Y (en) * | 1993-04-29 | 1994-01-05 | 黑龙江省水利科学研究所 | Weighing type measuring instrument for soil water content evapouration and distribution |
| CN201045587Y (en) * | 2007-06-15 | 2008-04-09 | 武汉科恒工控工程有限责任公司 | Device for improving weighing precision of weightless balance |
| DE202009000642U1 (en) * | 2009-01-20 | 2009-03-19 | Ums Gmbh | Lysimeter with a device for mechanical separation of the snow loading |
| CN202649069U (en) * | 2012-04-10 | 2013-01-02 | 西安理工大学 | High-precision lever type weighing lysimeter system based on spring balance |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103091197A (en) * | 2013-01-15 | 2013-05-08 | 甘肃省气象局 | Weighing steam infiltration meter |
| CN109342259A (en) * | 2018-11-30 | 2019-02-15 | 河北建筑工程学院 | A kind of lever lysimeter |
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| CN102680346B (en) | 2014-04-16 |
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