CN109959479A - A kind of outer cantilever anchor force calibration system - Google Patents
A kind of outer cantilever anchor force calibration system Download PDFInfo
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- CN109959479A CN109959479A CN201910304449.XA CN201910304449A CN109959479A CN 109959479 A CN109959479 A CN 109959479A CN 201910304449 A CN201910304449 A CN 201910304449A CN 109959479 A CN109959479 A CN 109959479A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
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Abstract
The present invention provides a kind of outer cantilever anchor force calibration system, utilize central processing unit, theoretical value input terminal, analyze end, force snesor, signal processing circuit, temperature sensor, comparison module and display calibrate the outer cantilever anchor force of twin legged thin wall pier, it is compared by the outer cantilever anchor force that theoretical calculation goes out with the outer cantilever anchor force that sensor measures to know that outer cantilever anchor force tests whether accurately, and pass through the temperature information at temperature sensor collecting test scene, in order to make site environment temperature of the staff clearly in the test of outer cantilever anchor force, wherein, external cantilever anchor force is calculated by the way of uniformly distributed line load conversion in theoretical calculation, when acquiring outer cantilever anchor force using sensor, keep the data measured more accurate by signal processing circuit.
Description
Technical field
The present invention relates to intelligence test field more particularly to a kind of outer cantilever anchor force calibration systems.
Background technique
Third and fourth connection of certain city's Section of Outer Ring Line road project main line overpass is 55+3 × 100+55m continuous rigid frame, is to cross over
Planning road and be arranged.Bridge zone hypsography is larger.Bridge is in road horizontal curve, and R=1270m, bridge deck becomes with curve
Change, bridge longitudinal slope is 3%, horizontal slope 1.5%.Third and fourth connection is divided to left and right two width, and girder and lower structure are respectively independent.Bridge top knot
Structure uses pre-stressed concrete and consecutive steel structures, and the main pier in lower part uses twin legged thin wall pier, and access bridge transition pier uses hollow pier, and basis is adopted
With pile foundation plus cushion cap form.
Wherein, the test of outer cantilever anchor force is most important to the safety of twin legged thin wall pier, still, in the prior art only
External cantilever anchor force is tested, and fails to carry out it efficient, accurate calibration, thus can not learn the outer cantilever anchor of gained
Gu whether power is accurate.
In this regard, it is urgent to provide a kind of outer cantilever anchor force calibration systems.
Summary of the invention
Therefore, in order to overcome the above problem, the present invention provides a kind of outer cantilever anchor force calibration system, utilizes central processing
Device, theoretical value input terminal, analysis end, force snesor, signal processing circuit, temperature sensor, comparison module and display
The outer cantilever anchor force of twin legged thin wall pier is calibrated, what the outer cantilever anchor force and sensor gone out by theoretical calculation measured
Outer cantilever anchor force is compared to know that outer cantilever anchor force tests whether accurately, and existing by temperature sensor collecting test
The temperature information of field, in order to make site environment temperature of the staff clearly in the test of outer cantilever anchor force, wherein theoretical
External cantilever anchor force is calculated by the way of uniformly distributed line load conversion in calculating, is acquired outer cantilever using sensor and is anchored
When power, keep the data measured more accurate by signal processing circuit.
Outer cantilever anchor force calibration system provided by the invention include central processing unit, theoretical value input terminal, analysis end,
Force snesor, signal processing circuit, temperature sensor, comparison module and display.
Wherein, the output end of theoretical value input terminal is connect with the input terminal at analysis end, the output end and signal of force snesor
The input terminal of processing circuit connects, and analyzes the output of the output end at end, the output end of signal processing circuit and temperature sensor
End is connect with the input terminal of central processing unit, and the input terminal of comparison module and the input terminal of display are filled with central processing
The output end connection set, the output end of comparison module and the input terminal of display connect.
Wherein, theoretical value input terminal is used to input the parameter for calculating outer cantilever anchor force under loads, analysis end use
In calculating outer cantilever anchor under loads according to the parameter of the anchor force under loads of cantilever outside the calculating inputted in theoretical value input terminal
Gu power FB, force snesor is set to anchor point stress point, anchors force signal, signal processing electricity under loads for detecting outer cantilever
Road carries out signal processing to the anchor force that force snesor acquires, and by treated, force signal F is transmitted to central processing unit, temperature
Degree sensor is used to detect the temperature signal of test site, the anchor force F that central processing unit will receiveBIt is passed with anchor force F
Comparison module is transported to, comparison module is used for anchor force FBIt is compared with anchor force F, and comparison result is transmitted to display
It is shown, the anchor force F that central processing unit will receiveB, anchor force F and temperature signal be transmitted to display and shown
Show.
Preferably, theoretical value input terminal be used for input for calculate outer cantilever under loads anchor force parameter be it is outer hang
Beam load, external support load action length L, analysis end according to cantilever outside the calculating inputted in theoretical value input terminal for carrying
The parameter of anchor force calculates outer cantilever anchor force F under loads under lotusBMethod and step it is as follows:
Power is carried out equivalency transform by S1: unilateral outer overhung load is shared by 4 groups of brackets, therefore single group bracket bearing load, in formula,Indicate single group external support load, 1.1 be load safety coefficient；
S2, uniformly distributed line load conversion: single group external support load conversion is uniformly distributed line load, in formula,LFor external support lotus
Carry action length；
S3 determines pre- pressure point, and uniformly distributed line load is converted to load, determines precompressed point position:, in formula,
X indicates distance of the pre- pressure point apart from anchor point；
S4 calculates outer cantilever anchor force F under loads according to distance x of the pre- pressure point apart from anchor point obtained by above-mentioned calculatingB,
In, fixed point and pre- pressure point set up anchor point two sides, fixed point and anchor point separately at a distance of y, then cantilever must be gone out in load by analyzing end
Lower anchor force；
S5, analysis end is by outer cantilever anchor force F under loadsBIt is transmitted to central processing unit.
Preferably, force snesor is set to anchor point stress point, anchors force signal under loads for detecting outer cantilever,
Signal processing circuit carries out successively carrying out signal amplification to the anchor force that force snesor acquires and signal is filtered.
Preferably, force snesor anchors force signal for detecting outer cantilever under loads, and the force signal of acquisition is converted
For voltage signal V0, and voltage signal V0 is transmitted to signal processing circuit, V1 is by signal processing circuit treated electricity
Signal is pressed, signal processing circuit includes signal amplification unit and signal filter unit, and the output end and signal of force snesor amplify
The input terminal of unit connects, and the output end of signal amplification unit is connect with the input terminal of signal filter unit, signal filter unit
Output end and central processing unit input terminal connect.
Preferably, signal amplification unit includes integrated transporting discharging A1-A2, capacitor C1-C6, triode VT1-VT2, voltage-stabiliser tube
D1-D2 and resistance R1-R9, wherein the first pin of integrated transporting discharging A1 and A2 are-IN pin, and second pin is+IN pin, the
Three pins are COMP pin, and the 4th pin is V+ pin, and the 5th pin is S/D pin, and the 6th pin is V- pin, the 7th pin
For OUT pin, the 8th pin is NC pin.
Wherein, the output end of force snesor is connect with one end of resistance R2, and one end ground connection of resistance R1, resistance R1's is another
End is connect with one end of resistance R2, and the other end of resistance R2 is connect with the first pin of integrated transporting discharging A1, the other end of resistance R2
It is also connect with one end of resistance R3, the second pin ground connection of integrated transporting discharging A1, one end ground connection of capacitor C2, the other end of capacitor C2
It is connect with one end of resistance R4, the other end of capacitor C2 is also connect with -15V power supply, the 6th pin and -15V of integrated transporting discharging A1
Power supply connection, the other end of resistance R4 are connect with the third pin of integrated transporting discharging A1, the 4th pin and+15V of integrated transporting discharging A1
Power supply connection, one end ground connection of capacitor C1, the other end of capacitor C1 are connect with+15V power supply, the other end and capacitor C5 of resistance R3
Other end connection, the other end of resistance R3 also connect with the anode of voltage-stabiliser tube D1, and the cathode of voltage-stabiliser tube D1 is with triode VT1's
Base stage connection, the cathode of voltage-stabiliser tube D1 are also connect with one end of resistance R5, and the other end of resistance R5 is connect with+30V power supply, resistance
The other end of R5 is also connect with the collector of triode VT1, and the other end of capacitor C5 is also connect with the emitter of triode VT1,
One end of capacitor C3 is connect with the cathode of voltage-stabiliser tube D2, and one end of capacitor C3 is also connect with one end of capacitor C6, and capacitor C3's is another
The connection of 5th pin of one end and integrated transporting discharging, the anode of voltage-stabiliser tube D2 are connect with the base stage of triode VT2, the sun of voltage-stabiliser tube D2
Pole is also connect with one end of resistance R7, and the other end of resistance R7 is connect with -30V power supply, the other end of resistance R7 also with triode
The collector of VT2 connects, and the other end of resistance R3 is also connect with the 7th pin of integrated transporting discharging A1, one end of capacitor C6 also with collection
It is connected at the 7th pin of amplifier A1, the 7th pin of integrated transporting discharging A1 is connect with the 2nd pin of integrated transporting discharging A2, capacitor C5's
The other end is also connect with the 4th pin of integrated transporting discharging A2, and the first pin of integrated transporting discharging A2 is connect with one end of resistance R8, electricity
The other end ground connection of R8 is hindered, the other end of capacitor C6 is connect with one end of resistance R6, the other end and integrated transporting discharging A2 of resistance R6
The connection of third pin, one end of resistance R6 also connect with the emitter of triode VT2, the emitter of triode VT2 with integrate
The 6th pin of amplifier A2 connects, and the collector of triode VT2 is connect with -30V power supply, one end of capacitor C4 and integrated transporting discharging A2
The connection of the 5th pin, the other end of capacitor C4 connect with one end of resistance R9, the other end of capacitor C4 also with integrated transporting discharging A2
The connection of the 7th pin, the 7th pin of integrated transporting discharging A2 connect with the input terminal of signal filter unit.
Preferably, signal filter unit includes resistance R10-R16, capacitor C7-C12 and integrated transporting discharging A3.
Wherein, the output end of signal amplification unit is connect with one end of resistance R10, the other end of resistance R10 and integrated fortune
The inverting input terminal connection of A3 is put, the non-inverting input terminal ground connection of integrated transporting discharging A3, the other end of resistance R10 is also with resistance R11's
One end connection, the other end of resistance R11 are connect with the output end of integrated transporting discharging A3, one end of resistance R12 and one end of resistance R11
Connection, one end of resistance R13 are connect with one end of resistance R11, and one end of capacitor C7 is connect with one end of resistance R11, capacitor C7
The other end connect with the output end of integrated transporting discharging A3, the other end of resistance R16 is connect with one end of capacitor C12, resistance R15's
The other end is connect with one end of capacitor C11, and the other end of resistance R14 is connect with one end of capacitor C10, the other end of resistance R13
It is connect with one end of capacitor C9, the other end of resistance R12 is connect with one end of capacitor C8, the other end and integrated transporting discharging of capacitor C8
The output end of A3 connects, and the other end of capacitor C9 is connect with the output end of integrated transporting discharging A3, the other end of capacitor C10 and integrated fortune
The output end connection of A3 is put, the other end of capacitor C11 is connect with the output end of integrated transporting discharging A3, the other end and collection of capacitor C12
It is connected at the output end of amplifier A3, the output end of integrated transporting discharging A3 and the input terminal of central processing unit connect, and signal filtering is single
Voltage signal V0 is transmitted to central processing unit by member.
Preferably, the anchor force F that central processing unit will receiveBIt is transmitted to comparison module with anchor force F, compares mould
Block is used for anchor force FBIt is compared with anchor force F, if Shu FB- F Shu >=500N, then comparison module output warning message is extremely shown
Device, if Shu FB- F Shu < 500N, then comparison module exports qualified information to display.
Preferably, temperature sensor is ceramic package type platinum resistance temperature sensor.
Preferably, central processing unit is 8-bit microprocessor Atmega128.
Preferably, display is LCD display unit, and LCD display unit uses 3.3V power voltage supply.
Compared with prior art, the present invention have it is following the utility model has the advantages that
(1) present invention provides a kind of outer cantilever anchor force calibration system, utilizes central processing unit, theoretical value input terminal, analysis
The outer cantilever anchor of end, force snesor, signal processing circuit, temperature sensor, comparison module and display to twin legged thin wall pier
Gu power is calibrated, by the outer cantilever anchor force that theoretical calculation goes out be compared with the outer cantilever anchor force that sensor measures with
Know that outer cantilever anchor force tests whether accurately, and pass through the temperature information at temperature sensor collecting test scene, in order to make
The clear site environment temperature when outer cantilever anchor force is tested of staff, wherein using uniformly distributed line load in theoretical calculation
The external cantilever anchor force of the mode of conversion is calculated, and when acquiring outer cantilever anchor force using sensor, passes through signal processing electricity
Road keeps the data measured more accurate.
(2) a kind of outer cantilever anchor force calibration system provided by the invention, inventive point of the invention are also resided in since power passes
Sensor acquisition signal signal-to-noise ratio it is undesirable, thus using signal amplification unit by integrated transporting discharging A1-A2, capacitor C1-C6,
Triode VT1-VT2, voltage-stabiliser tube D1-D2 and resistance R1-R9 amplify processing to the voltage V0 that force snesor exports, by integrating
The signal amplification unit that amplifier A1-A2, capacitor C1-C6, triode VT1-VT2, voltage-stabiliser tube D1-D2 and resistance R1-R9 are constituted is only
Have offset within the drift of 0.4 μ V/ DEG C, 2 μ V, in 100pA bias current and the broadband 0.1Hz to 10Hz 2.6nV noise.Its
In, signal filter unit is using resistance R10-R16, capacitor C7-C12 and integrated transporting discharging A3 to by amplified voltage signal
Low-pass filtering treatment is carried out, to improve the precision of power detection.
Detailed description of the invention
Fig. 1 is that entity load divides schematic diagram；
Fig. 2 is outer cantilever end stress model figure；
Fig. 3 is the functional diagram of outer cantilever anchor force calibration system of the invention；
Fig. 4 is the circuit diagram of signal processing circuit of the invention.
Appended drawing reference:
1- central processing unit；2- theoretical value input terminal；3- analyzes end；4- force snesor；5- signal processing circuit；6- temperature passes
Sensor；7- comparison module；8- display.
Specific embodiment
Outer cantilever anchor force calibration system provided by the invention is described in detail with reference to the accompanying drawings and examples.
As shown in figure 3, outer cantilever anchor force calibration system provided by the invention includes that central processing unit 1, theoretical value are defeated
Enter end 2, analysis end 3, force snesor 4, signal processing circuit 5, temperature sensor 6, comparison module 7 and display 8.
Wherein, the output end of theoretical value input terminal 2 is connect with the input terminal at analysis end 3, the output end and letter of force snesor 4
The input terminal connection of number processing circuit 5, analyzes the output end at end 3, the output end and temperature sensor 6 of signal processing circuit 5
Output end connect with the input terminal of central processing unit 1, the input terminal of the input terminal of comparison module 7 and display 8 with
The output end of central processing unit 1 connects, and the output end of comparison module 7 is connect with the input terminal of display 8.
Wherein, theoretical value input terminal 2 is used to input the parameter for calculating outer cantilever anchor force under loads, analysis end 3
For calculating outer cantilever under loads according to the parameter of the anchor force under loads of cantilever outside the calculating inputted in theoretical value input terminal 2
Anchor force FB, force snesor 4 is set to anchor point stress point, force signal is anchored under loads for detecting outer cantilever, at signal
Reason circuit 5 carries out signal processing to the anchor force that force snesor 4 acquires, and force signal F is transmitted to central processing by treated
Device 1.
Due to being voltage signal by treated the force signal of signal processing circuit 5, central processing unit 1 is according to receiving
Voltage signal be scaled force signal, that is to say, that by treated the voltage signal of signal processing circuit 5 and force signal be pair
It should be related to (the transmission function relationship for meeting force snesor 4), force signal F can be reduced to herein.
Temperature sensor 6 is used to detect the temperature signal of test site, the anchor force F that central processing unit 1 will receiveB
It is transmitted to comparison module 7 with anchor force F, comparison module 7 is used for anchor force FBIt is compared with anchor force F, and knot will be compared
Fruit is transmitted to display 8 and is shown, the anchor force F that central processing unit 1 will receiveB, anchor force F and temperature signal pass
Display 8 is transported to be shown.
Utilize central processing unit 1, theoretical value input terminal 2, analysis end 3, force snesor 4, signal processing circuit 5, temperature
Sensor 6, comparison module 7 and display 8 calibrate the outer cantilever anchor force of twin legged thin wall pier, are gone out by theoretical calculation
Outer cantilever anchor force be compared with the outer cantilever anchor force that sensor measures to know that outer cantilever anchor force tests whether standard
Really, and by the temperature information at temperature sensor collecting test scene, in order to make staff clearly in outer cantilever anchor force
Site environment temperature when test, wherein in theoretical calculation by the way of uniformly distributed line load conversion external cantilever anchor force into
Row calculates, and when acquiring outer cantilever anchor force using sensor, keeps the data measured more accurate by signal processing circuit.
According to 0# block entity load assignment, 0# block load (being self-possessed comprising template) is divided by Fig. 1 are as follows: outer overhung load
w1；Interior load w2, i.e. load between twin legged thin wall pier；Pier top load w3, that is, directly act on the load on pier stud.It divides detailed
Figure is shown in Fig. 1.
Specifically, theoretical value input terminal 2 be used for input for calculate outer cantilever under loads anchor force parameter be it is outer hang
Beam load, external support load action length L, analysis end 3 according to cantilever outside the calculating inputted in theoretical value input terminal 2 for existing
The parameter of anchor force calculates outer cantilever anchor force F under loads under loadBMethod and step it is as follows:
Power is carried out equivalency transform by S1: unilateral outer overhung load is shared by 4 groups of brackets, therefore single group bracket bearing load, in formula,Indicate single group external support load, 1.1 be load safety coefficient；
S2, uniformly distributed line load conversion: single group external support load conversion is uniformly distributed line load, in formula,LFor external support lotus
Carry action length；
S3 determines pre- pressure point, and uniformly distributed line load is converted to load, determines precompressed point position:, in formula,
X indicates distance of the pre- pressure point apart from anchor point；
As shown in Fig. 2, x is AB sections of length, wherein A point is to apply to concentrate force, i.e., pre- pressure point, and B point is anchor point.
S4 calculates outer cantilever anchor force F under loads according to distance x of the pre- pressure point apart from anchor point obtained by above-mentioned calculatingB,
Wherein, fixed point and pre- pressure point set up anchor point two sides, fixed point and anchor point separately at a distance of y, then analyze the cantilever that must go out of end 3 and carrying
Anchor force under lotus；
As shown in Fig. 2, y is BC sections of length, wherein C point is fixed point.
S5, analysis end 3 is by outer cantilever anchor force F under loadsBIt is transmitted to central processing unit 1.
Specifically, force snesor 4 is set to anchor point stress point, anchors force signal under loads for detecting outer cantilever,
Signal processing circuit 5 carries out successively carrying out signal amplification to the anchor force that force snesor 4 acquires and signal is filtered.
As shown in figure 4, force snesor 4 anchors force signal for detecting outer cantilever under loads, the force signal of acquisition is turned
It is changed to voltage signal V0, and voltage signal V0 is transmitted to signal processing circuit 5, V1 is after the processing of signal processing circuit 5
Voltage signal, signal processing circuit 5 include signal amplification unit and signal filter unit, the output end and letter of force snesor 4
The input terminal connection of number amplifying unit, the output end of signal amplification unit are connect with the input terminal of signal filter unit, and signal is filtered
The output end of wave unit is connect with the input terminal of central processing unit 1.
Specifically, signal amplification unit includes integrated transporting discharging A1-A2, capacitor C1-C6, triode VT1-VT2, voltage-stabiliser tube
D1-D2 and resistance R1-R9, wherein the first pin of integrated transporting discharging A1 and A2 are-IN pin, and second pin is+IN pin, the
Three pins are COMP pin, and the 4th pin is V+ pin, and the 5th pin is S/D pin, and the 6th pin is V- pin, the 7th pin
For OUT pin, the 8th pin is NC pin.
Wherein, the output end of force snesor 4 is connect with one end of resistance R2, and one end ground connection of resistance R1, resistance R1's is another
One end is connect with one end of resistance R2, and the other end of resistance R2 is connect with the first pin of integrated transporting discharging A1, and resistance R2's is another
End is also connect with one end of resistance R3, and the second pin ground connection of integrated transporting discharging A1, one end ground connection of capacitor C2, capacitor C2's is another
End connect with one end of resistance R4, the other end of capacitor C2 is also connect with -15V power supply, the 6th pin of integrated transporting discharging A1 and -
The connection of 15V power supply, the other end of resistance R4 connect with the third pin of integrated transporting discharging A1, the 4th pin of integrated transporting discharging A1 and+
The connection of 15V power supply, one end ground connection of capacitor C1, the other end of capacitor C1 are connect with+15V power supply, the other end and electricity of resistance R3
Hold the other end connection of C5, the other end of resistance R3 is also connect with the anode of voltage-stabiliser tube D1, the cathode and triode of voltage-stabiliser tube D1
The base stage of VT1 connects, and the cathode of voltage-stabiliser tube D1 is also connect with one end of resistance R5, and the other end and+30V power supply of resistance R5 connects
It connects, the other end of resistance R5 is also connect with the collector of triode VT1, transmitting of the other end of capacitor C5 also with triode VT1
Pole connection, one end of capacitor C3 are connect with the cathode of voltage-stabiliser tube D2, and one end of capacitor C3 is also connect with one end of capacitor C6, capacitor
The other end of C3 and the 5th pin of integrated transporting discharging connect, and the anode of voltage-stabiliser tube D2 is connect with the base stage of triode VT2, voltage-stabiliser tube
The anode of D2 is also connect with one end of resistance R7, and the other end of resistance R7 is connect with -30V power supply, the other end of resistance R7 also with
The collector of triode VT2 connects, and the other end of resistance R3 is also connect with the 7th pin of integrated transporting discharging A1, one end of capacitor C6
It is also connect with the 7th pin of integrated transporting discharging A1, the 7th pin of integrated transporting discharging A1 is connect with the 2nd pin of integrated transporting discharging A2, electricity
The other end for holding C5 is also connect with the 4th pin of integrated transporting discharging A2, and the first pin of integrated transporting discharging A2 and one end of resistance R8 connect
It connects, the other end ground connection of resistance R8, the other end of capacitor C6 is connect with one end of resistance R6, the other end of resistance R6 and integrated fortune
Put the third pin connection of A2, one end of resistance R6 also connect with the emitter of triode VT2, the emitter of triode VT2 and
The 6th pin of integrated transporting discharging A2 connects, and the collector of triode VT2 is connect with -30V power supply, one end of capacitor C4 and integrated fortune
Put the 5th pin connection of A2, the other end of capacitor C4 connect with one end of resistance R9, the other end of capacitor C4 also with integrated fortune
The 7th pin connection of A2 is put, the 7th pin of integrated transporting discharging A2 is connect with the input terminal of signal filter unit.
Specifically, signal filter unit includes resistance R10-R16, capacitor C7-C12 and integrated transporting discharging A3.
Wherein, the output end of signal amplification unit is connect with one end of resistance R10, the other end of resistance R10 and integrated fortune
The inverting input terminal connection of A3 is put, the non-inverting input terminal ground connection of integrated transporting discharging A3, the other end of resistance R10 is also with resistance R11's
One end connection, the other end of resistance R11 are connect with the output end of integrated transporting discharging A3, one end of resistance R12 and one end of resistance R11
Connection, one end of resistance R13 are connect with one end of resistance R11, and one end of capacitor C7 is connect with one end of resistance R11, capacitor C7
The other end connect with the output end of integrated transporting discharging A3, the other end of resistance R16 is connect with one end of capacitor C12, resistance R15's
The other end is connect with one end of capacitor C11, and the other end of resistance R14 is connect with one end of capacitor C10, the other end of resistance R13
It is connect with one end of capacitor C9, the other end of resistance R12 is connect with one end of capacitor C8, the other end and integrated transporting discharging of capacitor C8
The output end of A3 connects, and the other end of capacitor C9 is connect with the output end of integrated transporting discharging A3, the other end of capacitor C10 and integrated fortune
The output end connection of A3 is put, the other end of capacitor C11 is connect with the output end of integrated transporting discharging A3, the other end and collection of capacitor C12
It is connected at the output end of amplifier A3, the output end of integrated transporting discharging A3 is connect with the input terminal of central processing unit 1, and signal filtering is single
Voltage signal V0 is transmitted to central processing unit 1 by member.
In above embodiment, the noise of signal processing circuit 5 drifts about within 2.6nV as 0.4 μ V/ DEG C, integrated transporting discharging
A1-A2 is LT1210 low drifting integrated transporting discharging, and integrated transporting discharging A3 is TL072 integrated transporting discharging, due to the direct current of integrated transporting discharging A1
Offset will not influence the overall offset of circuit with drift, so that circuit has extremely low offset and drift.
In signal amplification unit, the resistance value of resistance R1 is 60 Ω, and the resistance value of resistance R2 is 300 Ω, the resistance value of resistance R3
It is resistance value for 1K Ω, resistance R4 is 6.2K Ω, resistance R5 is that resistance value is 1K Ω, and resistance R6 is that resistance value is 6.2K Ω, and resistance R7 is
Resistance value is 1K Ω, and resistance R8 is that resistance value is 1K Ω, and resistance R9 is that resistance value is 1K Ω, and the capacitance of capacitor C1 is 1 μ F, capacitor C2's
Capacitance is 1 μ F, and the capacitance of capacitor C3 is 0.01 μ F, and the capacitance of capacitor C4 is 0.01 μ F, and the capacitance of capacitor C5 is 1 μ
The capacitance of F, capacitor C6 are 1 μ F, and voltage-stabiliser tube D1-D2 is 15V voltage-stabiliser tube, and the model of triode VT1-VT2 is 2N3904.
In signal amplification unit, signal amplification unit have 13MHz full power bandwidth, to the signal received into
When row signal amplifies, drives integrated transporting discharging A2, integrated transporting discharging A2 that collected signal is further amplified using integrated transporting discharging A1, believe
Number amplifying unit be in capacitive load it is stable, there is short-circuit protection, and will do it Thermal shutdown in overheat.
In signal filter unit, signal filter unit is the filter of -3dB/oct, first in signal filter unit
Frequency of heart is f0, then define f04 times, 16 times and 1/4,1/16 times, when applicable frequency band is 20Hz-20kHz, from fL=
20Hz、fH=20kHz is available:
。
f0Constant R14 can be obtained on the basis of the μ of C10=0.01 F:
。
4 f0Constant C11, R15 take the 1/2 of C10 value, R14 value 1/2 when, frequency is just 4 f0。16 f0It is normal
Number C12, R16 is also the same, takes the 1/4 of the 1/4 of the C10 value, value of R14.f0/4、f0/ 16 similarly calculate according to this sequence, calculate
The resistance value that resistance R12 can be obtained is 100.6K Ω, and the resistance value of resistance R13 is 50.32K Ω, and the resistance value of resistance R14 is 25.16K Ω,
The resistance value of resistance R15 is 12.58K Ω, and the resistance value of resistance R16 is 6.29K Ω, and the capacitance of capacitor C8 is 0.04 μ F, capacitor C9
Capacitance be 0.02 μ F, the capacitance of capacitor C10 is 0.01 μ F, and the capacitance of capacitor C11 is 5000pF, the electricity of capacitor C12
Capacitance is 2500pF.
Wherein, capacitor C7 is used as the response adjustment near 20kHz, will become when the capacitance of capacitor C7 is 2200pF-
The straight line of 3dB/oct, feedback resistance R11 are arranged to, the decaying of thermal compensation signal filter unit equal with R12, R10=R11/A=22k
Ω。
Pass through integrated fortune since the signal-to-noise ratio of the signal of the acquisition of force snesor 4 is undesirable, thus using signal amplification unit
Put the voltage V0 that A1-A2, capacitor C1-C6, triode VT1-VT2, voltage-stabiliser tube D1-D2 and resistance R1-R9 export force snesor 4
Processing is amplified, by integrated transporting discharging A1-A2, capacitor C1-C6, triode VT1-VT2, voltage-stabiliser tube D1-D2 and resistance R1-R9 structure
At signal amplification unit only have offset within the drift of 0.4 μ V/ DEG C, 2 μ V, 100pA bias current and 0.1Hz to 10Hz wide
Noise with interior 2.6nV.Wherein, signal filter unit is using resistance R10-R16, capacitor C7-C12 and integrated transporting discharging A3 to warp
It crosses amplified voltage signal and carries out low-pass filtering treatment, to improve the precision of power detection.
Specifically, the anchor force F that central processing unit 1 will receiveBIt is transmitted to comparison module 7 with anchor force F, compares mould
Block 7 is used for anchor force FBIt is compared with anchor force F, if Shu FB- F Shu >=500N, then comparison module 7 exports warning message to aobvious
Show device 8, if Shu FB- F Shu < 500N, then comparison module 7 exports qualified information to display 8.
Specifically, temperature sensor 6 is ceramic package type platinum resistance temperature sensor.
Specifically, central processing unit 1 is 8-bit microprocessor Atmega128.
In view of the requirement of cost and process performance, central processing unit 1 selects low-power consumption 8-bit microprocessor
Atmega128, the chip hardware is resourceful, has many advantages, such as that low-power consumption, function be more, cheap and powerful,
Atmega128 itself has 128K bytes Flash memory, simultaneous with the eeprom memory of 4K byte, each sensor
The data of acquisition are directly deposited in eeprom memory, and the port ADC inside Atmega128 has 8 channels, every channel
Resolution ratio is 10bit, and input voltage range is 0 ~ 5V, can satisfy the needs of the touring acquisition of monitoring data, while without another
Add AD conversion device, simplify periphery circuit design, reduces costs.
Specifically, display 8 is LCD display unit, and LCD display unit uses 3.3V power voltage supply.
In above embodiment, LCD display unit use 3.3V power voltage supply, in order to microprocessor Atmega128
I/O mouth electrical level match, LCD display unit and the interface of microprocessor Atmega128 are communicated using serial line interface.
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting.Although ginseng
It is described the invention in detail according to embodiment, those skilled in the art should understand that, to technical side of the invention
Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered in the present invention
Scope of the claims in.
Claims (10)
1. a kind of outer cantilever anchor force calibration system, which is characterized in that the outer cantilever anchor force calibration system includes centre
Manage device (1), theoretical value input terminal (2), analysis end (3), force snesor (4), signal processing circuit (5), temperature sensor
(6), comparison module (7) and display (8)；
Wherein, the output end of the theoretical value input terminal (2) is connect with the input terminal of analysis end (3), the force snesor
(4) output end is connect with the input terminal of the signal processing circuit (5), at the output end for analyzing end (3), the signal
Input terminal of the output end of the output end and the temperature sensor (6) of managing circuit (5) with the central processing unit (1)
The input terminal of connection, the input terminal of the comparison module (7) and the display (8) with the central processing unit (1)
Output end connection, the output end of the comparison module (7) are connect with the input terminal of the display (8)；
Wherein, the theoretical value input terminal (2) is used to input the parameter for calculating outer cantilever anchor force under loads, and described point
End (3) are analysed to be used to be calculated according to the parameter of the outer cantilever of the calculating inputted in the theoretical value input terminal (2) anchor force under loads
Outer cantilever anchor force F under loadsB, the force snesor (4) is set to anchor point stress point, for detecting outer cantilever in load
Lower anchoring force signal, the signal processing circuit (5) carry out signal processing to the anchor force that the force snesor (4) acquires, and
By treated, force signal F is transmitted to the central processing unit (1), and the temperature sensor (6) is for detecting test site
Temperature signal, the anchor force F that the central processing unit (1) will receiveBThe comparison module is transmitted to anchor force F
(7), the comparison module (7) is used for anchor force FBIt is compared with anchor force F, and comparison result is transmitted to the display
Device (8) shown, the anchor force F that the central processing unit (1) will receiveB, anchor force F and temperature signal be transmitted to
The display (8) is shown.
2. outer cantilever anchor force calibration system according to claim 1, which is characterized in that the theoretical value input terminal (2)
For input for calculate outer cantilever under loads anchor force parameter be outer contilever load, external support load action length L,
Analysis end (3) is used for the ginseng according to the outer cantilever of the calculating inputted in the theoretical value input terminal (2) anchor force under loads
Number calculates outer cantilever anchor force F under loadsBMethod and step it is as follows:
Power is carried out equivalency transform by S1: unilateral outer overhung load is shared by 4 groups of brackets, therefore single group bracket bearing load, in formula,Indicate single group external support load, 1.1 be load safety coefficient；
S2, uniformly distributed line load conversion: single group external support load conversion is uniformly distributed line load, in formula,LFor external support lotus
Carry action length；
S3 determines pre- pressure point, and uniformly distributed line load is converted to load, determines precompressed point position:, in formula, x
Indicate distance of the pre- pressure point apart from anchor point；
S4 calculates outer cantilever anchor force F under loads according to distance x of the pre- pressure point apart from anchor point obtained by above-mentioned calculatingB, wherein
Fixed point and pre- pressure point set up anchor point two sides, fixed point and anchor point separately at a distance of y, then the analysis end (3) cantilever that must go out exists
Anchor force under load；
S5, the analysis end (3) is by outer cantilever anchor force F under loadsBIt is transmitted to the central processing unit (1).
3. outer cantilever anchor force calibration system according to claim 1, which is characterized in that force snesor (4) setting
In anchor point stress point, force signal is anchored under loads for detecting outer cantilever, the signal processing circuit (5) passes the power
The anchor force of sensor (4) acquisition carries out successively carrying out signal amplification and signal filtering processing.
4. outer cantilever anchor force calibration system according to claim 1 or 3, which is characterized in that the force snesor (4) is used
Force signal is anchored under loads in detecting outer cantilever, the force signal of acquisition is converted into voltage signal V0, and by voltage signal V0
It is transmitted to the signal processing circuit (5), V1 is by the signal processing circuit (5) treated voltage signal, the letter
Number processing circuit (5) includes signal amplification unit and signal filter unit, the output end and the signal of the force snesor (4)
The input terminal of amplifying unit connects, and the output end of the signal amplification unit is connect with the input terminal of the signal filter unit,
The output end of the signal filter unit is connect with the input terminal of the central processing unit (1).
5. outer cantilever anchor force calibration system according to claim 4, which is characterized in that the signal amplification unit includes
Integrated transporting discharging A1-A2, capacitor C1-C6, triode VT1-VT2, voltage-stabiliser tube D1-D2 and resistance R1-R9, wherein integrated transporting discharging A1
The first pin with A2 is-IN pin, and second pin is+IN pin, and third pin is COMP pin, and the 4th pin draws for V+
Foot, the 5th pin are S/D pin, and the 6th pin is V- pin, and the 7th pin is OUT pin, and the 8th pin is NC pin；
Wherein, the output end of the force snesor (4) is connect with one end of resistance R2, one end ground connection of resistance R1, resistance R1's
The other end is connect with one end of resistance R2, and the other end of resistance R2 is connect with the first pin of integrated transporting discharging A1, and resistance R2's is another
One end is also connect with one end of resistance R3, and the second pin ground connection of integrated transporting discharging A1, one end ground connection of capacitor C2, capacitor C2's is another
One end is connect with one end of resistance R4, and the other end of capacitor C2 is also connect with -15V power supply, the 6th pin of integrated transporting discharging A1 with -
The connection of 15V power supply, the other end of resistance R4 connect with the third pin of integrated transporting discharging A1, the 4th pin of integrated transporting discharging A1 and+
The connection of 15V power supply, one end ground connection of capacitor C1, the other end of capacitor C1 are connect with+15V power supply, the other end and electricity of resistance R3
Hold the other end connection of C5, the other end of resistance R3 is also connect with the anode of voltage-stabiliser tube D1, the cathode and triode of voltage-stabiliser tube D1
The base stage of VT1 connects, and the cathode of voltage-stabiliser tube D1 is also connect with one end of resistance R5, and the other end and+30V power supply of resistance R5 connects
It connects, the other end of resistance R5 is also connect with the collector of triode VT1, transmitting of the other end of capacitor C5 also with triode VT1
Pole connection, one end of capacitor C3 are connect with the cathode of voltage-stabiliser tube D2, and one end of capacitor C3 is also connect with one end of capacitor C6, capacitor
The other end of C3 and the 5th pin of integrated transporting discharging connect, and the anode of voltage-stabiliser tube D2 is connect with the base stage of triode VT2, voltage-stabiliser tube
The anode of D2 is also connect with one end of resistance R7, and the other end of resistance R7 is connect with -30V power supply, the other end of resistance R7 also with
The collector of triode VT2 connects, and the other end of resistance R3 is also connect with the 7th pin of integrated transporting discharging A1, one end of capacitor C6
It is also connect with the 7th pin of integrated transporting discharging A1, the 7th pin of integrated transporting discharging A1 is connect with the 2nd pin of integrated transporting discharging A2, electricity
The other end for holding C5 is also connect with the 4th pin of integrated transporting discharging A2, and the first pin of integrated transporting discharging A2 and one end of resistance R8 connect
It connects, the other end ground connection of resistance R8, the other end of capacitor C6 is connect with one end of resistance R6, the other end of resistance R6 and integrated fortune
Put the third pin connection of A2, one end of resistance R6 also connect with the emitter of triode VT2, the emitter of triode VT2 and
The 6th pin of integrated transporting discharging A2 connects, and the collector of triode VT2 is connect with -30V power supply, one end of capacitor C4 and integrated fortune
Put the 5th pin connection of A2, the other end of capacitor C4 connect with one end of resistance R9, the other end of capacitor C4 also with integrated fortune
The 7th pin connection of A2 is put, the 7th pin of integrated transporting discharging A2 is connect with the input terminal of the signal filter unit.
6. outer cantilever anchor force calibration system according to claim 5, which is characterized in that the signal filter unit includes
Resistance R10-R16, capacitor C7-C12 and integrated transporting discharging A3；
Wherein, the output end of the signal amplification unit is connect with one end of resistance R10, the other end of resistance R10 and integrated fortune
The inverting input terminal connection of A3 is put, the non-inverting input terminal ground connection of integrated transporting discharging A3, the other end of resistance R10 is also with resistance R11's
One end connection, the other end of resistance R11 are connect with the output end of integrated transporting discharging A3, one end of resistance R12 and one end of resistance R11
Connection, one end of resistance R13 are connect with one end of resistance R11, and one end of capacitor C7 is connect with one end of resistance R11, capacitor C7
The other end connect with the output end of integrated transporting discharging A3, the other end of resistance R16 is connect with one end of capacitor C12, resistance R15's
The other end is connect with one end of capacitor C11, and the other end of resistance R14 is connect with one end of capacitor C10, the other end of resistance R13
It is connect with one end of capacitor C9, the other end of resistance R12 is connect with one end of capacitor C8, the other end and integrated transporting discharging of capacitor C8
The output end of A3 connects, and the other end of capacitor C9 is connect with the output end of integrated transporting discharging A3, the other end of capacitor C10 and integrated fortune
The output end connection of A3 is put, the other end of capacitor C11 is connect with the output end of integrated transporting discharging A3, the other end and collection of capacitor C12
It is connected at the output end of amplifier A3, the output end of integrated transporting discharging A3 is connect with the input terminal of the central processing unit (1), described
Voltage signal V0 is transmitted to the central processing unit (1) by signal filter unit.
7. outer cantilever anchor force calibration system according to claim 1, which is characterized in that the central processing unit (1)
The anchor force F that will be receivedBIt is transmitted to the comparison module (7) with anchor force F, the comparison module (7) is used for anchor force FB
It is compared with anchor force F, if Shu FB- F Shu >=500N, then the comparison module (7) exports warning message to the display
(8), if Shu FB- F Shu < 500N, then the comparison module (7) exports qualified information to the display (8).
8. outer cantilever anchor force calibration system according to claim 1, which is characterized in that the temperature sensor (6) is
Ceramic package type platinum resistance temperature sensor.
9. outer cantilever anchor force calibration system according to claim 1, which is characterized in that the central processing unit (1)
For 8-bit microprocessor Atmega128.
10. outer cantilever anchor force calibration system according to claim 1, which is characterized in that the display (8) is LCD
Display unit, LCD display unit use 3.3V power voltage supply.
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