CN1963415A - Intelligence checking apparatus for level of storage bin - Google Patents

Abstract

This invention relates to materials intelligent test device, which comprises proportion force device and digital intelligent display meter, wherein, the digital intelligent display meter comprises single machine, memory, signal amplifying circuit, power, A/D converter, communication interface, display, keyboard and multiple coveter, wherein, the power is connected to keyboard and multiple converter; single machine is connected to display, memory, communication interface, A/D converter, keyboard; the multiple path converter is connected to A/D converter, signal amplifying circuit.

Description

The bin-level intelligent detecting instrument

Technical field

The invention belongs to automatic detection range, particularly a kind of bin-level intelligent detecting instrument.

Technical background

Feed bin is the storage device of soil industry production run indispensabilities such as chemical industry, metallurgy, batching.Yet it is an insurmountable technical barrier that bin-level detects always.The detection of stirring industry cement bin material level as concrete is not well solved so far, causes the production scene can't know material level situation in the material, and very difficult aspect control of material.Domestic and international market charge level detector table is a lot of at present, surveys instrument, infrared ray charge level detector, ultrasound wave charge level detector etc. as capacitance level meter, Weight type charge level material.But the bin-level pick-up unit of these types is harsh to the uniformity requirement of condition in the storehouse and material characteristic, requires the packing of the specific inductive capacity of material and material even as capacitance level meter; The hammer level-sensing device that hangs down requires the material absolute rest, and buries hammer in the material movement process easily, destroys pick-up unit; Infrared ray and supersonic reflectoscope require no dust in the storehouse, and dust is serious to the accuracy of detection influence, and costs an arm and a leg.Therefore, existing charge level detector table application surface is very limited, and accuracy of detection is not high.

Summary of the invention

At problems of the prior art, the invention provides a kind of bin-level intelligent detecting instrument.

The present invention includes ratio power takeoff and digital intelligent Displaying Meter two parts.

The ratio power takeoff is gathered the power that acts on the supporting leg in proportion, it is made up of upper and lower brace summer, LOAD CELLS, locking device and proportion force device, upper and lower brace summer is installed on the feed bin supporting leg, one brace summer links to each other with LOAD CELLS by locking device, LOAD CELLS links to each other with proportion force device one end, the proportion force device other end links to each other with another brace summer, the desirable identical structure of upper and lower brace summer, and the lower support beam also can directly be supported on the cement flooring.The number of feed bin proportion of installation power takeoff is required to select according to accuracy of detection by the user, for the less demanding feed bin of accuracy of detection, can use a cover power takeoff; Feed bin for accuracy of detection is had relatively high expectations can use the quadruplet power takeoff; For the feed bin between above-mentioned two kinds of accuracy requirements, the power takeoff that can use two cover diagonal angles to install.

If the upper and lower mounting distance that is supported on the supporting leg of ratio power takeoff is l ₀, jar heavily is W ₀, maximum weight of loading is W, and 4 supports are steel pipe, and outer diameter of steel pipes is D, and wall thickness is δ, then the rigidity k of supporting leg power taking part ₀Calculate according to following formula:

$k_0=\frac{\mathrm{E\π}(2\mathrm{D\δ}-{\mathrm{\δ}}^{\text{2}})}{l_0}---\left(1\right)$

In the formula: E-metallic spring modulus.

By the elasticity mechanics as can be known, the deflection Δ l between lower support on the preceding power takeoff of supporting leg charging ₀₁Calculate according to following formula:

$\mathrm{\Δ}{l}_{01}=\frac{W_0{l}_0}{\mathrm{E\π}(2\mathrm{D\δ}-{\mathrm{\δ}}^2)}---\left(2\right)$

Fill the deflection Δ l between lower support on the supporting leg power takeoff of material back ₀₁Calculate according to following formula:

$\mathrm{\Δ}{l}_{01}=\frac{(W_0-W)l_0}{\mathrm{E\π}(2\mathrm{D\δ}-{\mathrm{\δ}}^2)}---\left(3\right)$

The supporting leg deflection Δ l that causes because of charging then ₀Calculate according to following formula:

$\mathrm{\Δ}{l}_0=\mathrm{\Δ}{l}_{02}-\mathrm{\Δ}{l}_{01}=\frac{W{l}_0}{\mathrm{E\π}(2\mathrm{D\δ}-{\mathrm{\δ}}^2)}---\left(4\right)$

Because power takeoff upper support and lower support are irregularly shaped, and are directly installed on the feed bin supporting leg.Be difficult to directly calculate the rigidity of lower support, its rigidity is determined in available ANASYS finite element analysis.Power takeoff upper support and locking device frame can be built unified model during calculating and calculate global stiffness by reinforcing.Lower support is obtained global stiffness with the modeling of LOAD CELLS mounting seat.If now calculating the global stiffness of upper support and power takeoff locking device is k ₁, the global stiffness of lower support and sensor mounting seat is k ₂, establish proportion force device rigidity power k ₃, then the global stiffness of power takeoff calculates according to following formula:

$k=\frac{k_1{k}_2{k}_3}{k_1{\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="A20061013464500101.png,A20061013464500111.png"\; state="\{\{state\}\}">k</figure-callout>}}_2+k_2{\mathrm{<figure-callout\; id="3"\; label="k"\; filenames="A20061013464500101.png,A20061013464500111.png"\; state="\{\{state\}\}">k</figure-callout>}}_3+k_3{k}_1}---\left(5\right)$

If supporting leg rigidity is k ₀, the power that acts on single supporting leg is F, and the power that the proportion force device LOAD CELLS obtains is F ₁, then can get following formula by Fig. 1:

$k[\frac{F}{k_0}-F_1(\frac{1}{{\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="A20061013464500101.png,A20061013464500111.png"\; state="\{\{state\}\}">k</figure-callout>}}_1}+\frac{1}{{\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="A20061013464500101.png,A20061013464500111.png"\; state="\{\{state\}\}">k</figure-callout>}}_2}+\frac{1}{k_0})]=F_1---\left(6\right)$

If choosing the maximum range of LOAD CELLS is W _e(20% overload capacity is arranged usually), the max cap. of storehouse charging is W, requires maximum to reach 90% during use, then can make F in the formula (6) ₁=0.9W _e, F=W, again that the Rigidity Calculation that can try to achieve proportion force device after the individual arrangement of formula (5) substitution formula (6) is as follows:

${\mathrm{<figure-callout\; id="3"\; label="k"\; filenames="A20061013464500101.png,A20061013464500111.png"\; state="\{\{state\}\}">k</figure-callout>}}_3=\frac{0.9W_e{k}_1{k}_2}{k_1{k}_2[\frac{W}{k_0}-0.9W_e(\frac{1}{{\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="A20061013464500101.png,A20061013464500111.png"\; state="\{\{state\}\}">k</figure-callout>}}_1}+\frac{1}{{\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="A20061013464500101.png,A20061013464500111.png"\; state="\{\{state\}\}">k</figure-callout>}}_2}+\frac{1}{k_0})]-0.9W_e({\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="A20061013464500101.png,A20061013464500111.png"\; state="\{\{state\}\}">k</figure-callout>}}_1+k_2)}---\left(7\right)$

In order to increase proportion force device stability, adopt hollow stem or channel-section steel.

The digital intelligent Displaying Meter is realized detection, filtering and system calibrating function, and it comprises single-chip microcomputer, storer, signal amplification circuit, power supply, A/D converter, communication interface, display, keyboard and traffic pilot.Power supply links to each other with keyboard, traffic pilot respectively, and single-chip microcomputer links to each other with display, storer, communication interface, A/D converter, keyboard respectively, and traffic pilot links to each other with A/D converter, signal amplification circuit respectively, as shown in Figure 2.For realizing digital intelligent Displaying Meter function, eight functional modules have been embedded, system management module, parameter are selected module, storehouse parameter setting module, transducer calibration module, sampling parameter setting module, material level detection module, serial communication module, serial communication setting module, and system management module is managed other functional module.

System management module realizes that control detection instrument keyboard switches sign indicating number scanning and switch at the Presentation Function interface.

Parameter selects module to pass through display system setup parameter group and keyboard switches sign indicating number scanning, realizes the parameter setting interface switching.

The storehouse parameter setting module realizes that the storehouse parameter shows and keyboard scan, determines the artificial setting value of each parameter, and the storehouse parameter setting comprises the max cap. in storehouse sum, storehouse number and each storehouse.

The transducer calibration module realizes demonstrations of sensing calibrating parameters, sampling sensor input value, keyboard scan, determines the transducer calibration data, and transducer calibration comprises that the low code value in each storehouse, low material are heavy, high code value and high material weigh.

Sampling parameter setting module, sampling parameter are set and are comprised sample frequency, filtering and display cycle.

The material level detection module realizes pressing the material level detection of system default parameter to each feed bin of system, and adopts intelligent filter to realize handling detecting data by system default parameter, removes the interference that detects in the data, stable detection result.

The serial communication parameter is provided with module and realizes communicating by letter of measuring instrument and control or monitoring system main frame, can realize detecting the long-range demonstration and the storage of data, and the serial communication setting comprises plane No., baud rate and data bit.

The teletransmission that serial communication module is realized receiving the host computer order and detected data.

Principle of work of the present invention is as follows:

When in the storehouse during loaded material weight of material be loaded into (feed bin that has has six supporting legs) on four supporting legs, according to principle of elasticity, four supports can produce corresponding compression deformation by weight distribution situation in the storehouse, proportion force device is carried on the pressure and weighting transducers after waiting deformation principle part that supporting leg is stressed to take out in the ratio power takeoff, promptly four sensor weight and with feed bin in the weight of material proportional.Signal amplification circuit detects the resistance-strain conversion of signals with the pressure type LOAD CELLS and becomes voltage signal, convert digital quantity to through A/D converter, calculate by system default parameter again, convert the number percent of controlling level to, be presented on the matrix display with figure and data dual mode.

But the present invention's online in real time detects controlling level and is presented on the instrument, simultaneously also exportable RS485 digital signal.The present invention detects the passing ratio power takeoff with material level and converts weighing-up wave to, and two kinds of functions that show material level of figure and numeral are arranged, and under wind pendulum situation, utilizes intelligent filter software to guarantee to detect the validity of controlling level, and error is lower than 1%.

Description of drawings

Fig. 1 is a ratio power takeoff structural representation of the present invention,

(a) be first kind of structural representation of ratio power takeoff,

(b) be second kind of structural representation of ratio power takeoff,

(c) be the third structural representation of ratio power takeoff;

Fig. 2 is a digital intelligent Displaying Meter schematic block circuit diagram of the present invention;

Fig. 3 concerns synoptic diagram for digital intelligent Displaying Meter functional module of the present invention;

Fig. 4 is this example keyboard circuit schematic diagram;

Fig. 5 is this example signal amplifying circuit schematic diagram;

Fig. 6 is this example single-chip microcomputer and peripheral circuit schematic diagram thereof,

(a) be RS485 serial communication circuit schematic diagram,

(b) be single-chip microcomputer, storer, A/D converter, display interface device and multi-path converter circuit schematic diagram;

Fig. 7 is this example power circuit principle figure;

Fig. 8 is this instance system administration module process flow diagram,

(a) system management module initialization flowchart,

(b) system management module keyboard scan process flow diagram;

Fig. 9 selects module flow for displaying figure for this instance parameter;

Figure 10 is this example feed bin parameter setting module process flow diagram,

(a) feed bin parameter setting module flow for displaying figure,

(b) feed bin parameter setting module keyboard scan process flow diagram;

Figure 11 is this example sensor demarcating module process flow diagram,

(a) transducer calibration module flow for displaying figure,

(b) transducer calibration module keyboard scan process flow diagram;

Figure 12 is this example sampling parameter setting module process flow diagram,

(a) sampling parameter setting module flow for displaying figure,

(b) sampling parameter setting module keyboard scan process flow diagram;

Figure 13 is this example serial communication setting module process flow diagram,

(a) serial communication setting module flow for displaying figure,

(b) serial communication setting module keyboard scan process flow diagram;

Figure 14 is this example material level detection module process flow diagram;

Figure 15 is that this example serial communication module interrupts process flow diagram;

Figure 16 is that this example single-chip microcomputer timer T0 interrupts process flow diagram;

Figure 17 is this example interface input mobile process process flow diagram;

Figure 18 is this example test interface flow for displaying figure;

Figure 19 is this example intelligent filter process flow diagram;

Figure 20 is each surface chart of this example,

(a) select the interface for parameter,

(b) be the feed bin parameter setting interface,

(c) be the transducer calibration interface,

(d) set the interface for sampling parameter,

(e) set the interface for serial communication,

(f) be material level detection system interface.

1 is the upper support beam among the figure, and 2 is locking device, and 3 is proportion force device, and 4 is LOAD CELLS, and 5 is the lower support beam, and 6 is the batch can supporting leg, and 7 is the LOAD CELLS base.

Specific embodiments

The present invention will be further described below in conjunction with accompanying drawing.

Figure 1 shows that ratio power takeoff structural representation among the present invention.

Fig. 1 (a) is the structural representation of first kind of ratio power takeoff, upper and lower brace summer is arranged on the batch can supporting leg 6, upper support beam 1 links to each other with the upper end of proportion force device 3 by locking device 2, the lower end of proportion force device 3 links to each other with LOAD CELLS 4 on being fixedly mounted on LOAD CELLS base 7, and the LOAD CELLS base is directly installed on the lower support beam 5.

Fig. 1 (b) is the structural representation of second kind of ratio power takeoff, upper and lower brace summer is arranged on the batch can supporting leg 6, upper support beam 1 links to each other with LOAD CELLS 4 by locking device 2, and LOAD CELLS 4 links to each other with the upper end of proportion force device 3, and the lower end of proportion force device 3 is fixedly mounted on the lower support beam 5.

Fig. 1 (c) is the structural representation of the third ratio power takeoff, upper and lower brace summer is arranged on the batch can supporting leg 6, upper support beam 1 links to each other with LOAD CELLS 4 by a cover locking device 2, LOAD CELLS 4 links to each other with the upper end of proportion force device 3 by another set of locking device 2, two cover locking device symmetries act on the LOAD CELLS, and the lower end of proportion force device 3 is fixedly mounted on the lower support beam 5.

The design of ratio power takeoff is as follows in the example:

(1) on the supporting leg installed of given power takeoff apart from l ₀, calculate power taking part rigidity k by formula (1) according to the interior external diameter of supporting leg pipe ₀

1. l ₀=300mm, maximum weight of loading W=100 ton, supporting steel pipe outer diameter D=219mm, thickness of steel pipe δ=6mm, the elastic modulus E of steel=206 GPa, then power taking part Rigidity Calculation is as follows:

$k_0=\frac{206\&times;{10}^9\&times;3.14\&times;[2\&times;219\&times;{10}^{-3}\&times;6\&times;{10}^{-3}{-(6\&times;{10}^{-3})}^2]}{300\&times;{10}^{-3}}=5.589\&times;{10}^9(N/m)$

2. l ₀=300mm, maximum weight of loading W=200 ton, supporting steel pipe outer diameter D=273mm, thickness of steel pipe δ=7.5mm, the elastic modulus E of steel=206 GPa, then power taking part Rigidity Calculation is as follows:

$k_0=\frac{206\&times;{10}^9\&times;3.14\&times;[2\&times;273\&times;{10}^{-3}\&times;7.5\&times;{10}^{-3}-{(7.5\&times;{10}^{-3})}^2]}{300\&times;{10}^{-3}}=8.708\&times;{10}^9(N/m)$

(2) determine the supporting leg deflection Δ l that causes because of charging ₀

1. maximum weight of loading W=100 ton, supporting leg is counted n=4, and then the supporting leg deflection that causes because of charging is calculated as follows:

$\mathrm{\&Delta;}{l}_0=\frac{100\&times;{10}^3\&times;9.8}{4\&times;5.589\&times;{10}^9}=4.384\&times;{10}^{-5}\left(m\right)$

2. maximum weight of loading W=200 ton, supporting leg is counted n=4, and then the supporting leg deflection that causes because of charging is calculated as follows:

$\mathrm{\&Delta;}{l}_0=\frac{200\&times;{10}^3\&times;9.8}{4\&times;8.708\&times;{10}^9}=5.627\&times;{10}^{-5}\left(m\right)$

(3) select LOAD CELLS, determine the maximum range W of LOAD CELLS _e

For pressure transducer, can select three types of 100kg, 200kg or 500kg.

(4) design supporting construction up and down, and calculate supporting leg rigidity k up and down with finite element method ₁And k ₂

Upper support is got the 20mm steel plate and is welded into as shown in Figure 1 bathtub construction, by the ANSYS software analysis, tries to achieve

k ₁＝2.532×10 ⁹(N/m)

The desirable structure identical of lower support with upper support, then

k ₂＝k ₁＝2.532×10 ₉(N.m)

Also steel plate directly can be supported on the cement flooring, then

k ₂≈+∞

(5) supporting deformation amount about the checking computations makes $\frac{{\mathrm{<figure-callout\; id="1"\; label="W\; e\; k"\; filenames="A20061013464500101.png,A20061013464500111.png"\; state="\{\{state\}\}">W</figure-callout>}}_e}{k_{}}<\frac{1}{20}\mathrm{\&Delta;}{l}_0$ With $\frac{{\mathrm{<figure-callout\; id="2"\; label="W\; e\; k"\; filenames="A20061013464500101.png,A20061013464500111.png"\; state="\{\{state\}\}">W</figure-callout>}}_e}{k_{}}<\frac{1}{20}\mathrm{\&Delta;}{l}_0.$

$\frac{{\mathrm{<figure-callout\; id="1"\; label="W\; e\; k"\; filenames="A20061013464500101.png,A20061013464500111.png"\; state="\{\{state\}\}">W</figure-callout>}}_e}{k_{}}=\frac{500\&times;9.8}{2.532\&times;{10}^9}=1.935\&times;{10}^{-6}<\frac{1}{20}\&times;4.384\&times;{10}^{-5}=2.019\&times;{10}^{-5}m$

Promptly support stiffness meets the demands for maximum sensor up and down, then can meet the demands for less sensor.

(6) determine the rigidity of power takeoff bar by formula (7).

Power takeoff bar rigidity as shown in Table 1 and Table 2.

Table 1 is for the power takeoff bar Rigidity Calculation table of maximum weight of loading W=100 ton

Sensor W e	100kg	200kg	500kg
				Proportion force device rigidity k 3(N/m)	2.012×10 7	4.024×10 7	6.036×10 7

Table 2 is for the power takeoff bar Rigidity Calculation table of maximum weight of loading W=200 ton

Sensor W e	100kg	200kg	500kg
				Proportion force device rigidity k 3(N/m)	1.567×10 7	3.135×10 7	7.837×10 7

(7) according to l among Fig. 1 ₁And k ₃, determine the sectional area of proportion force device.

l ₀Sensor is installed with locking device and all is designed to 100mm, then l among the=300mm, Fig. 1 (a), Fig. 1 (c) ₁=200mm.

Calculate the proportion force device sectional area shown in table 3 and table 4.

Table 3 is for maximum weight of loading W=100 ton proportion force device sectional area reckoner

Sensor W e	100kg	200kg	500kg
				Proportion force device sectional area (mm 2)	19.53	39.07	97.6

Table 4 is for maximum weight of loading W=200 ton proportion force device sectional area reckoner

Sensor W e	100kg	200kg	500kg
				Proportion force device sectional area (mm 2)	15.21	30.4	76.08

When proportion force device is elected Fig. 1 (b) structure as, then area amplifies 3 times, and 3 bar average areas are 3 times of the table intermediate value.

(8) checking proportion force device stability, as not meeting the demands, then redesign is till meeting the demands.

Figure 4 shows that the digital intelligent display meter keyboard circuit of this example schematic diagram, have 16 keys among the figure, comprise 10 of ten keys, upper and lower, 4 cursor keys in a left side and the right side, 1 acknowledgement key and 1 reset key, each key link to each other with 16 pins of expansion mouthful Z2 respectively.

Figure 5 shows that the digital intelligent display meter signal amplification circuit of this example schematic diagram, signal amplification circuit totally 4 tunnel can connect 4 groups of sensors, the signal amplifier of OP07, and a mouthful Z1 links to each other with expansion.

Fig. 6 (a) is depicted as serial communication circuit schematic diagram in the digital intelligent display meter of this example, 1,4 pins of MAX485 link to each other with 10,11 pins of single-chip microcomputer W58E516 among Fig. 6 (b) respectively, and 2,3 pins of MAX485 link to each other with 8 pins of single-chip microcomputer W58E516 simultaneously; Fig. 6 (b) is depicted as single-chip microcomputer, storer, A/D converter, display interface device and multi-path converter circuit schematic diagram in the digital intelligent display meter of this example, and single-chip microcomputer W58E516,12 bit A/D converter AD574, traffic pilot AD508, RS485, the two charged preservation of 8K RAM0064, KYBD/display-interface 8279 are formed and display interface U ₂

Figure 7 shows that the digital intelligent display meter circuit theory diagrams of this example, power supply comprises host power supply, each road probe power, U1, U2, U3, U4 are 4 road probe powers among the figure, are the 12V insulating power supply, promptly with system power supply not altogether; U0 is+5V to be the system host power supply; U01, U01 be respectively+12V and-12V, be signal amplifier and A/D converter power supply.

Figure 4 shows that the synoptic diagram that concerns of realizing eight functional modules that digital intelligent Displaying Meter function embeds, system management module is managed other functional module.

This example detects test to the flyash feed bin (100 tons) and cement silo (200 tons) material level of concrete mixing plant, sensor is all selected 500kg for use, each feed bin is installed 4 sensors, and table 5 and table 6 are respectively flyash feed bin and two groups of testing results of cement silo material level, sequence number band in the table " ^*" detect data for having under the landscape condition.

The test findings of the upper and lower material process in table 5 flyash storehouse

Sequence number	1	2	3	4 *	5 *	6	7	8 *	9 *	10 *
											Material loading (ton)	0	20		30			20	30
Blanking (ton)	0		3.6		4.2	6.3			4	12.4
											Material (ton) in the storehouse	0	20	16.4	46.4	42.2	35.9	55.6	85.6	81.6	69.2
Instrument detected value (%)	0	19.8	16.1	46.8	41.5	36.1	56.1	86.4	82.5	70.1
											Relative error	0	0.2	0.3	0.4	0.7	0.2	0.4	0.8	0.9	0.9

The test findings of the upper and lower material process of table 6 cement bin

Sequence number	1	2	3	4 *	5	6 *	7 *	8	9 *	10
											Material loading (ton)	0	50				50	50	50
Blanking (ton)	0		8.7	9.2	4.2				4	12.4
											Material (ton) in the storehouse	0	50	41.3	32.1	27.9	77.9	127.9	177.9	173.9	161.5
Instrument detected value (%)	0	24.1	20.2	15.4	14.2	39.7	63.4	99.3	87.5	81.0
											Relative error	0	0.45	0.4	0.65	0.25	0.75	0.55	0.35	0.55	0.25

By data in table 5 and the table 6 as can be seen, accuracy of instrument of the present invention detects error all less than 1%, stirs enterprise at concrete and finishes the requirement that can satisfy the detection of production material level.

Claims (6)

1, a kind of bin-level intelligent detecting instrument, it is characterized in that comprising ratio power takeoff and digital intelligent Displaying Meter two parts, the ratio power takeoff is gathered the power that acts on the supporting leg in proportion, it is made up of upper and lower brace summer, LOAD CELLS, locking device and proportion force device, upper and lower brace summer is installed on the feed bin supporting leg, one brace summer links to each other with LOAD CELLS by locking device, and LOAD CELLS links to each other with proportion force device one end, and the proportion force device other end links to each other with another brace summer; The digital intelligent Displaying Meter comprises single-chip microcomputer, storer, signal amplification circuit, power supply, A/D converter, communication interface, display, keyboard and traffic pilot, power supply links to each other with keyboard, traffic pilot respectively, single-chip microcomputer links to each other with display, storer, communication interface, A/D converter, keyboard respectively, and traffic pilot links to each other with A/D converter, signal amplification circuit respectively.

2, a kind of bin-level intelligent detecting instrument according to claim 1, it is characterized in that described digital intelligent Displaying Meter, eight functional modules have been embedded, be that system management module, parameter are selected module, storehouse parameter setting module, transducer calibration module, sampling parameter setting module, material level detection module, serial communication module, serial communication setting module, system management module is managed other functional module.

3, a kind of bin-level intelligent detecting instrument according to claim 1 is characterized in that the rigidity of described ratio power takeoff bar is calculated according to following formula:

$k_3=\frac{0.9W_e{k}_1{k}_2}{k_1{k}_2[\frac{W}{k_0}-0.9W_e(\frac{1}{k_1}+\frac{1}{k_2}+\frac{1}{k_0}\left)\right]-0.9W_e(k_1+k_2)}$

In the formula: k ₁---the global stiffness of upper support and power takeoff; k ₂---the global stiffness of lower support and sensor mounting seat;

The maximum weight of loading of W---feed bin; W _e---the maximum range of LOAD CELLS;

k ₀---the rigidity of supporting leg power taking part.

4, a kind of bin-level intelligent detecting instrument according to claim 1, the first kind of structure that it is characterized in that described ratio power takeoff, on its batch can supporting leg upper and lower brace summer is arranged, the upper support beam links to each other with the upper end of proportion force device by locking device, the lower end of proportion force device links to each other with LOAD CELLS on being fixedly mounted on the LOAD CELLS base, and the LOAD CELLS base is directly installed on the lower support beam.

5, a kind of bin-level intelligent detecting instrument according to claim 1, the second kind of structure that it is characterized in that described ratio power takeoff, on its batch can supporting leg upper and lower brace summer is arranged, the upper support beam links to each other with LOAD CELLS by locking device, LOAD CELLS links to each other with the upper end of proportion force device, and the lower end of proportion force device is fixedly mounted on the lower support beam.

6, a kind of bin-level intelligent detecting instrument according to claim 1, the third structure that it is characterized in that described ratio power takeoff, on its batch can supporting leg upper and lower brace summer is arranged, the upper support beam links to each other with LOAD CELLS by a cover locking device, LOAD CELLS links to each other with the upper end of proportion force device by another set of locking device, two cover locking device symmetries act on the LOAD CELLS, and the lower end of proportion force device is fixedly mounted on the lower support fine strain of millet.

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