CN208635900U - A kind of novel dynamic track balance system - Google Patents
A kind of novel dynamic track balance system Download PDFInfo
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- CN208635900U CN208635900U CN201821301530.XU CN201821301530U CN208635900U CN 208635900 U CN208635900 U CN 208635900U CN 201821301530 U CN201821301530 U CN 201821301530U CN 208635900 U CN208635900 U CN 208635900U
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Abstract
The utility model discloses a kind of novel dynamic track balance systems, are included in weighing table and divide into sensor module, further include the data acquisition and processing (DAP) module being electrically connected with sensor module；It further include bridge power supply module, microprocessor module, LCD display module, ethernet interface module；Data acquisition and processing (DAP) module includes amplifier circuit module, filter circuit and AD conversion circuit module；Sensor module includes column type sensor and uses four independent column type sensors；Bridge power supply module connects each module for being other module for power supply and being four independent column type sensor power supplies.The utility model use 4 road resistance-strain chip pressure sensor PR6201, it is compact-sized, overload capacity is stronger, intrinsic frequency high dynamic response fastly, installation is more convenient, manufacturing cost is low；Ethernet communication mode based on udp protocol, keeps system real time higher, establishes the reliability mechanisms for the reliable transmission that guarantees data security to solve the problems, such as the packet loss in transmission process.
Description
Technical field
The utility model relates to a kind of novel dynamic track balance systems, belong to railway weighing-appliance technical field.
Background technique
Nowadays, the trade of international and national, business transaction and industrial process are all closely bound up with weighing technology.When very much
It waits, weighing system largely affects the processes such as trade and industry.Track scale has a wide range of applications in China, by making
Be divided into static state railroad track scale with state, dynamic railway truck scale and railway weigh three kinds, they be widely used in factory, mine, metallurgy,
Foreign trade and railway department are in the weighing of lorry bulk goods.
In research and production or trade activity, need to weigh to the object in movement, or have vibration in outside
It weighs in the case where dynamic interference, under these situations, static state railroad track scale cannot play a role, and ask to solve this
Topic so that in production and living can to movement or have extraneous vibration interference source under conditions of carry out dynamic weighing, many is ground
Work is studied carefully with regard to this expansion, and dynamic railway truck scale has then played important function.
Dynamic railway truck scale is a kind of large-scale weighing machine that automatic weighing is carried out to dynamic rolling stock, it is with microprocessor
Core quickly and effectively measures the vehicle in traveling.It, which has, weighs accurately, quickly, and convenient reading is convenient for and miniature
Computer in conjunction with and the features such as realize Weighing and process control automation, be widely used in industrial and commercial trade, metallurgical mine, energy
The fields such as source traffic, medical and health, light industry and food.China's dynamic railway truck scale has had more than 50 years developing histories, the sixties
At initial stage, due to the development of production and the measuring requirement of bulk material, First dynamic mechanically track scale generates in China, due to electricity
Sub- technology is still undeveloped in the sixties and the beginning of the seventies, therefore this track scale has played important function that period, still
Due to the restriction of the factors such as the quality of domestic at that time electronic component and weighing sensor and precision, this track scale precision
Low, metering performance is also not sufficiently stable, and then at the end of the seventies to the beginning of the eighties, electric-mechanic control system dynamic railway truck scale occurs, new
Period, the measure of production in China require have further promotion, and the measure of production that this dynamic railway truck scale meets the new period is wanted
It asks, but since this track scale mechanical transfer link is too many, vibration link is too complicated, while application condition is big, therefore fails
Developed well.Into after the eighties, China's microcomputer technology rapid development, dynamic railway truck scale has important breakthrough.This
There is electronic track scale in one period, and the processing method of the dynamic weighing data of this track scale is widened, and logic judgment is more
Add intelligence.This period, China's gage work are advanced by leaps and bounds, and the emergence and development of dynamic electronic rail balance are in this period
It is with a very important position.Into after the nineties, electronics and computer technology are maked rapid progress so that traditional weighing apparatus is impacted,
Dynamic electronic rail balance weighing technology is ripe day by day, this period, occurs various new dynamic electronic rail balance in succession, such as
Foundation-free track scale, without weighing platform track scale, non-broken rail track scale, on-curve track scale, it is combined weighing apparatus etc..Track scale monitoring system
In this period, towards integrated, miniaturization, modularization is automated, and intelligent and networking direction is developed, i.e. dynamic
Acquisition of the track scale from original weight data, data prediction, data conversion, transmission and analysis, storage, to finally with picture
The form of table or text shows, and is automatically performed with the development of technology by the monitoring system, dynamic railway truck scale skill
Art is maked rapid progress, and the dynamic accuracy from originally is inferior to 1% accuracy by now and is better than 0.2%, the precision of dynamic railway truck scale
It is increasingly tended to be perfect with performance.Since 21st century, due to the development and weighing sensor performance of microcomputer technology
Improve, meanwhile, various modern science and technology interpenetrates, dynamic railway truck scale will on higher better platform, dynamic weighing rail
Road weighing apparatus technology can develop towards higher and higher precision, the direction of high-intelligentization with the development of science and technology.
But there are still some shortcomingss for current dynamic railway truck scale, are mainly reflected in:
(1) connection type of sensor is using connection type in parallel, entire dynamic if one of sensor goes wrong
The weighing of state track scale then will appear problem, and be not easy to check failure；
(2) precision of A/D converter is not high enough, and the error that whole system is introduced when analog-to-digital conversion is larger；
(3) data communication method mostly uses RS485 serial communication mode, and also data are sent by some using RS232 serial ports
Computer, both communication modes be not well positioned to meet dynamic railway truck scale to data high-speed and in real time require, error rate compared with
It is high.
Utility model content
Technical problem to be solved in the utility model is to overcome the deficiencies of existing technologies, provide a kind of measuring speed it is fast,
The higher novel dynamic railway truck scale of precision.
In order to solve the above technical problems, the utility model uses following technical scheme:
A kind of novel dynamic track balance system, characterized in that including weighing table, divide into sensor in the weighing table
Module, the sensor module is in generation deformation on foil gauge and converting deformation to the gravity in measurement process to
Electronic signal output；It further include the data acquisition and processing (DAP) module being electrically connected with sensor module；
It further include bridge power supply module, microprocessor module, LCD display module, ethernet interface module；
The data acquisition and processing (DAP) module includes amplifier circuit module, filter circuit and AD conversion circuit module；
The output of output connection the amplifier circuit module, amplifier circuit module of the sensor module connects filter circuit, filtering
Circuit output end connection AD conversion circuit module obtains input terminal；The output end of the AD conversion circuit module connects microprocessor
The input terminal of module；
LCD display module is connect with microprocessor module for showing information；
The sensor module includes column type sensor and uses four independent column type sensors；
The bridge power supply module connects each module for being other module for power supply and being four independent column type sensors
Power supply；
The ethernet interface module includes ethernet control chip and Ethernet transformer, and the Ethernet controls core
Piece is connect with microprocessor module and cable interface connection, the Ethernet transformer are integrated with RJ-45 connector.
Further, the microprocessor module uses the DSP of model MC56F8037.
Further, the column type sensor uses resistance-strain chip pressure sensor PR6201.
Further, the bridge power supply module is automatic tracking source circuit, including controllable accurate source of stable pressure TL431, same
Phase amplifier, sign-changing amplifier, triode Q1, triode Q2, triode Q3, triode Q4；The TL431 exports 2.5V benchmark
The input terminal of in-phase amplifier is input to after reference voltage, in-phase amplifier exports TL431 after 2.5V amplifies twice by three
Triode Q2 exports anode of the stable+5V voltage as automatic tracking source circuit, the sign-changing amplifier after pole pipe Q1 driving
Amplification factor be 1 times its by positive pole+5V voltage inversion, then by triode Q4 drive, triode Q3 current limliting output
Stable -5V voltage, the as cathode of automatic tracking source circuit.
Further, AD conversion circuit module uses four-way 16 gradually comparison A/D conversion chip AD7655.
Further, the ethernet control chip uses ethernet controller CP2200, the CP2200'sWith
The 13rd pin GPIOB pin of MC56F8037 connects, CP2200'sThe 12nd pin GPIOB of pin and MC56F8037 draw
Foot connection, CP2200'sThe 14th pin GPIOB pin of pin and MC56F8037 connection, D1~D7 of CP2200 respectively with
GPIOB0~GPIOB7 pin of MC56F8037 connects.
The utility model it is achieved the utility model has the advantages that
1. the utility model uses 4 road resistance-strain chip pressure sensor PR6201, compact-sized, overload capacity compares
By force, intrinsic frequency high dynamic response is fast, installation is more convenient, manufacturing cost is low.
2. proposing the ethernet communication mode based on udp protocol, keep system real time higher, establishes and guarantee data peace
The reliability mechanisms of full reliable transmission are to solve the problems, such as the packet loss in transmission process.
Detailed description of the invention
Fig. 1 is the dynamic railway truck scale functional block diagram of the utility model；
Fig. 2 is resistance-strain chip pressure sensor PR6201 internal structure chart；
Fig. 3 is the utility model autotracking formula sensor bridge power circuit schematic diagram；
Fig. 4 is three amplifier structure charts inside INA129；
Fig. 5 is the utility model filter circuit schematic diagram；
Fig. 6 is the hardware connection figure of the utility model AD7655 and DSP；
Fig. 7 is the interface circuit figure of the utility model DSP and LCD MODULE；
Fig. 8 is the utility model CP2200 and digital signal processing chip MC56F8037 hardware connection figure；
Fig. 9 is the side structure schematic diagram of the track scale of the utility model embodiment；
Wherein in Fig. 9: 1- concrete foundation；2- approach rail；3- weighing table；4- supporting beam；5- track；6- pillar sensing
Device；7- sensor top board；8- sensor lower platen；9- limits module；10- traverse rod.
Specific embodiment
The utility model is further described with reference to the accompanying drawing.Following embodiment is only used for clearly illustrating this
The technical solution of utility model, and cannot be used as a limitation the limitation protection scope of the utility model.
Fig. 1 is the dynamic railway truck scale functional block diagram of the utility model；Fig. 1 shows a kind of novel dynamic track balance system,
Mainly by weighing table, accurate bridge power supply, pressure sensor, data acquisition and processing (DAP) channel (i.e. data acquisition and processing (DAP) mould
Block), data processing module (including DSP), the composition such as ethernet communication interface.
The data acquisition and processing (DAP) module includes that sensor module, amplifier circuit module, filter circuit and AD turn
Change circuit module；
LCD display module is connect with microprocessor module for showing information；
The sensor module is used to turn by the gravity in measurement process in generation deformation on foil gauge and by deformation
Turn to electronic signal output；
The sensor module is using column type sensor and uses four independent column type sensors；
The bridge power supply module is for being other module for power supply and being four independent column type sensor power supplies；
The output of output connection the amplifier circuit module, amplifier circuit module of the sensor module connects filtered electrical
Road, filter circuit output end connection AD conversion circuit module obtain input terminal；The output end of the AD conversion circuit module connects
The output end of microprocessor；
The ethernet interface module includes ethernet control chip and Ethernet transformer, and the Ethernet controls core
Piece is connect with microprocessor module and cable interface connection, the Ethernet transformer are integrated with RJ-45 connector.
Weighing sensor is the important component of dynamic track balance system, is that the weight of metering is converted into the one of electricity
Kind force snesor.Design for dynamic railway truck scale whole system, since different types of track scale needs the weighing of selection to pass
Sensor type is far from each other, first has to consider the problems of be exactly to select what type of weighing sensor, the weight of industry spot
Data are directly obtained by weighing sensor, and weighing sensor is installed on industry spot, are in entire dynamic track balance system
Front end, its precision largely affect the precision and stability of entire dynamic railway truck scale systematic survey.So we
It is required that the shock resistance of selected sensor, overload-resistant, offset load resistance is good, and requires the output of sensor to stablize, output
Signal level is high.
There are many sensor for measuring pressure, there is piezoelectric transducer, capacitance sensor, strain-gauge transducer, inductance
Formula sensor etc..Piezoelectric transducer is the sensor based on piezoelectric effect, although it has bandwidth, high sensitivity, noise
Than it is high the advantages that, still, the humidity resistance of piezoelectric transducer is insufficient, and the DC response of output is poor, and piezoelectric transducer is quick
Sensing unit piezoelectric material price is higher, selects its economic cost higher.Although capacitance sensor structure is simple, it is cheap simultaneously
Sensitivity is also higher, but its output has non-linear, the influence of parasitic capacitance and distribution capacity to sensitivity and measurement accuracy
It is larger, and the connection circuit of capacitance sensor is more complicated, therefore capacitance sensor is not selected in the utility model.Inductance type
Sensor measurement range is big, and the linearity is good, but its sensitivity is low and there is exchange zero signal, is not suitable for being used in dynamic track
In the measurement of weighing apparatus.Resistance strain-gauge transducer is the sensor that strain is converted to resistance variations using resistance strain gage.
Resistance strain-gauge transducer has the advantages that following items: measurement range is wide, the measurement of strain pressure transducer
Range is 10-1~106Pa；Precision is higher, and measurement error is up to 0.1% or smaller；The linearity of output characteristics is good；Performance is steady
It is fixed, can be in high temperature, high pressure, high speed, low temperature, strong vibration works under the adverse circumstances such as high-intensity magnetic field and reliable operation；Cost performance
It is high.
Since the dynamic railway truck scale system requirements of the utility model can be realized the weight measurement to the vehicle of movement, and
It is required that measurement accuracy is high, speed is fast, and in orbit, external environmental interference is big for pressure sensor installation, when there is train to cross, vibration
It is dynamic relatively strong, comprehensively consider, the utility model uses resistance-strain chip pressure sensor.Select PHILIPS Co. raw in design
The resistance-strain chip pressure sensor PR6201 of production, which is column type sensor, has high overload, precision of measurement
The advantages that height, high sensitivity, the linearity is good, and installation and debugging facilitate.Meanwhile the senor operating temperature range is wide, freedom from vibration
Can be good, it can work in than relatively rugged environment.PR6201 internal structure chart is as shown in Figure 2.
The utility model is four individual routes using No. four sensors, and every route is independent of each other, independently of each other.
How the power supply of Gei Zhe No. tetra- sensor is considered the problems of in design.Pressure sensor PR6201 power supply requires to be direct current
4—24V.There are mainly two types of the modes powered at present to sensor: one is directly being powered with DC power supply, another kind is to utilize
Bridge power supply power supply.Although by DC power supply power directly to sensor in the way of simple to operation, DC power supply
Can be unstable, it is easy by external interference, while the output voltage signal of resistance-strain chip pressure sensor is very faint, is highly prone to
The interference of DC power supply, and sensor is mounted on outdoor, and external interference is larger, therefore sets clocking requirement power circuit in system
The voltage stabilization of offer.Comprehensively consider, uses bridge power supply circuit, that is, autotracking formula sensor bridge power supply.Power supply is simultaneously
No. four sensors are powered.Power circuit is as shown in Figure 3.
TL431 is the good three ends adjustable shunt reference source of a thermal stability in Fig. 3, its output voltage can be set
It is set to from the arbitrary value within the scope of 2.5V~36V, TL431 exemplary dynamic impedance is 0.2 Ω.TL431 is obtained surely in which can be convenient
Fixed reference voltage, so obtaining the accurate reference voltage of 2.5V in the utility model using TL431.
If Fig. 3 shows, OP07 is in-phase amplifier, and the 2.5V reference voltage which exports TL431 amplifies twice,
It is driven by Q1, Q2 current limliting exports stable+5V voltage, the as positive pole of automatic tracking source circuit.In figure, U17 is one
The inverting amplifier that a amplification factor is one times, then it drives positive pole+5V voltage inversion by Q4, Q3 current limliting is defeated
Stable -5V voltage out, the as cathode of automatic tracking source circuit.The positive and negative anodes absolute value of voltage phase of automatic tracking source circuit
Deng, symbol on the contrary, can effectively inhibit the drift of electric bridge mid-point voltage, provided for the pressure sensor in dynamic track balance system
Stable DC source improves the precision and stability of sensor output signal.
The sensitivity of PR6201 is 1mV/V in the system of the utility model, illustrates it in full scale, when power supply supplies
When to 1V voltage, sensor output signal is 1mV.Sensor bridge power supply maximum output is 10V, so sensor signal is maximum
Output is 10mV.
The utility model dynamic railway truck scale, when there is train by weighing table, the pressure sensor installed at the scene is held
It is the pulse voltage signal of millivolt level by weight output, and the input voltage range of the AD conversion chip used is 0V~5V,
Therefore subsequent AD conversion chip cannot be sent directly into from the small signal that pressure sensor exports and carry out conversion process, turn in A/D
Processing first must be amplified to the ultra-weak electronic signal of sensor output before alternatively, and amplification factor will reach certain numerical value
It can just meet the requirements.The voltage signal exported from sensor is up to 10mV, to reach the input range 10mV of A/D chip
× 500=5V, it is desirable that total magnification reaches 500 times.Sensor output signal is first fed into filter circuit, and filter circuit exists
Signal is exaggerated twice while filtering clutter, so in Design enlargement circuit, it is desirable that its amplification factor reaches 250
Times.Pressure sensor experiences the voltage signal exported after external pressure and is the small signal of differential mode and wherein contains biggish
Common mode part it requires that amplifier has the stronger ability for inhibiting common-mode signal, that is, require the common-mode rejection ratio foot of amplifier
Enough height.By comprehensively considering, the precision instrument amplifier of three amplifier structures has been selected.The related shadow designed in conjunction with the utility model
The factor of sound and economic cost governing factor, system design the integrated instrument amplifier chip INA129 of final choice.In the chip
Portion is differential input, and three amplifier structures of Single-end output, specific internal structure such as Fig. 4 shows.
The major parameter of INA129 are as follows: peak excursion voltage is 50 μ V；Temperature drift is 0.5 μ V/ DEG C；Input biased electrical
Stream is 5nA；Common-mode rejection ratio is 120dB；Supply voltage range is ± 2.5V~± 18V；Quiescent current is 700 μ A；Operation temperature
Spending range is -40 DEG C~+125 DEG C.
Known by Fig. 4, the amplification factor of the amplifier isBy changing RGBe sized so that its times magnification
Number is adjustable between 1~10000.It completely can be by adjusting R when designGAmplifying circuit is set to reach the amplification factor of requirement.Solve RG198 Ω of ≈ selects RGFor 200 Ω.There are also over-voltage protection modules by INA129 simultaneously, excessively electric
Press the reachable ± 40V of protection scope.
Filter circuit: low-pass filter, high-pass filter, bandpass filter, band resistance can be divided into according to working band classification
Filter and all-pass filter.Active filter and passive filter can be divided into according to its constituent element.Relative to active power filtering
For device, passive filter is only made of passive device R, L, C, and circuit is fairly simple, is not needed DC power supply and is powered, but nothing
Resistance in source filter, which can consume the signal in the energy and passive filter passband of useful signal, to be had energy loss and bears
It is obvious to carry Benefit Transfer, electromagnetic induction is easily caused when using inductance element, circuit volume and again is also resulted in when inductance is larger
Amount is all bigger, so general industry occasion does not use passive filter.Active filter is by passive element R, C and active device
Composition, noenergy loss in its passband, load effect is unobvious, influences small, and active filter when multistage is connected between each other
Wave device is small in size, light-weight, and due to not needing to carry out magnetic screen without using inductance element, active filter needs DC power supply to supply
Electricity.
In actual industrial control system, collected analog signal would generally adulterate many noise jammings, dynamic rail
Road weighing apparatus is typically disposed in outdoor, and site environment is more severe, and there are many inevitable interference.In dynamic track balance system, by
It include sensor in hardware components, amplifier, the circuits such as converter, the electronic component for forming these circuits can generate high frequency
Electric signal, in addition, due to the flatness on road surface, the reasons such as installation of track and weighing platform, when train displacement, can also be produced
Raw high-frequency interferencing signal, so inevitably by the interference of these high frequency electrical signals in whole system.In dynamic railway truck scale
In system, it would be desirable to useful signal be low frequency signal, above-mentioned high-frequency signal for useful weight signal,
Frequency range is significantly larger than weight signal, so low-pass filtering is carried out by the signal exported to sensor on hardware,
Most high-frequency interferencing signal can be filtered out.Sampling causes frequency overlapping in order to prevent, and in circuit design, we will be filtered
Link is arranged before sampling.
In conclusion desired cutoff frequency f in the utility model design0=500Hz, low-pass first order filter cannot expire
Foot requires, therefore uses second order active low-pass filter circuit in the utility model design, and the circuit is by integrated transporting discharging chip
OP07 and RC circuit composition.OP07 is a kind of low noise, and the bipolar operational amplifier of non-chopper-zero-stabilized, its feature is input
Offset voltage is very low, and input bias current is low and open-loop gain is high.OP07 input voltage range is wider, and input impedance is high, altogether
Mould inhibits than being up to 110dB.Its use temperature range is -55 DEG C~+125 DEG C.The circuit theory is the useful letter in system
It number is low frequency signal, high-frequency interferencing signal is decayed through capacitor, and low frequency useful signal is exported through amplifier, can finally filter out height
Frequency interference signal.Filter circuit figure such as Fig. 5 shows.No. seven pins of OP07 and No. eight pins are directly connected with potentiometer in circuit diagram
Effect be to return to zero to it.
Circuit as shown in Figure 5 introduces negative-feedback, and introduces positive feedback.When signal frequency is much smaller than cutoff frequency f0
When, since the reactance of the capacitor C1 in figure tends to be infinitely great, so that positive feedback is extremely faint；When signal frequency is much larger than cutoff frequency
Rate f0When, since the reactance of capacitor C2 in figure goes to zero, signal is weakened by the capacitor, and output voltage reduces.Therefore, Ke Yijing
Parameter selection appropriate is crossed, makes filter circuit in cutoff frequency f0Locate voltage amplification factor numerical value to increase, while again will not be because just
Feed back too strong generation self-oscillation.The filter can obtain preferable filter effect and have signal amplification, amplification factor concurrently
About 2 times.The passband amplification factor of amplifying circuit isHere devising amplification factor is about twice, then R1=
R2。
A/D converter circuit: being an important link in dynamic track balance system weighing channel, currently used AD conversion
Chip has biproduct parting, gradually compares type and parallel relatively type.Biproduct parting AD conversion chip precision is high, and interference free performance is preferable
And it is cheap, but its conversion speed is slow, is not suitable for high speed situation.Parallel comparison A/D converter uses multiple ratios
Compared with device, only makees primary relatively carry out and convert, conversion rate is very high, but it needs 2N-1 comparator, institute for N conversions
Will lead to that circuit scale is huge, and price is higher using parallel comparison A/D, therefore do not use in the design of this subsystem this
The converter of type.Gradually comparison A/D conversion chip passes through gradually CL Compare Logic structure by a comparator and D/A converter
At, since MSB, sequentially to each by input voltage and built-in D/A converter output be compared, compare output by n times
Digital value, gradually comparison A/D conversion chip speed is fast, low in energy consumption, and the circuit scale being made from it compares parallel comparison A/D
It is much smaller.Dynamic railway truck scale will realize dynamic metering accurate in real time to the train in traveling, it is desirable that metering performance is stablized,
Metered rate is fast, and this requires the analog-to-digital conversion link speeds in weighing channel will fastly, and precision is fast, that is, to selected
AD conversion chip has higher requirement.Selected A/D chip resolution wants high, and conversion speed is fast.
Assuming that weighing train each compartment weight is 150T, then 8 A/D converter precision are 150 × 103/28=
586kg, 12 A/D converter precision are 150 × 103/212=37kg, 16 A/D converter precision are 150 × 103/216=
2.3kg, by dynamic railway truck scale vertification regulation it is found that dynamic railway truck scale point 0.2 grade and 0.5 grade, scale division value e be respectively 50kg with
100kg, dynamic calibration error are ± 0.5e~± 4e.To make designed dynamic railway truck scale precision be higher than existing dynamic rail
Road weighing apparatus, A/D conversion circuit must be extremely accurate to 50kg or less and be just able to satisfy required precision.By being analyzed above it is found that 12 AD conversion
Device can be met the requirements, but in practical applications, it will lead to due to circuit design etc. in actual use, 12 AD turn
The precision for changing chip is typically only capable to reach the precision of 11 AD conversion, is not able to satisfy the requirement of this design still, final to only have
The converter of selection 16 can just meet the requirements, by the comparison of all kinds of A/D conversion chips in the market and to systematicness
The requirement of energy aspect, has selected the AD7655 analog-digital chip of AD company, the U.S..The chip, which is four-way 16, gradually to be compared
Compared with type AD conversion chip.
Fig. 6 is the hardware connection figure of AD7655 and DSP.In figure, BYTESWAP is that parallel schema selects end, and end input is low
When level, the LSB of data is exported from D [7:0], and MSB is exported from D [15:8]；When input is high level, data output sequence is then
On the contrary.For the convenience of reading data, the BYTESWAP is grounded in design.IMPULES is mode selection terminal, there is pulse mode
With two kinds of general mode, the end is grounded herein, is selected as general mode.For serial parallel model selection, which is
When high level, A/D chip is serial data output mode；End ground connection, A/D chip is parallel data pattern output.A/D chip work
Make under serial mode when, sixteen bit data successively from the end SDOUT export, and when its work in a parallel mode when, sixteen bit
Data are exported from D0~D15 to dsp chip respectively, therefore in a parallel mode, and the reading speed of data is relatively fast.Meanwhile
DSP used in design shares 64 pins, and wherein universal I/O port has 53, and quantity supports AD7655 work parallel enough
Under mode, then comprehensively consider the speed of data processing, it willGround connection makes AD7655 work export mould in parallel data
Under formula.For conversion end signal output end, after each channel conversion end,Export low level, by the end with
The GPIOA8 of MC56F8037 is connected, and is read by I/O portLevel change.It is connected with the GPIOA9 of DSP, by IO
Mouth output control signal, starts AD conversion.The end BUSY is connected with GPIOA10, and during AD conversion, which is always maintained at
For high level.A0 andIt is the input signal channel selection end and output signal channel selection end of AD conversion chip respectively.A0
When for high level, the signal of analog input channel INA1 and INB1 will be converted, when A0 is low level, then ALT-CH alternate channel INA2 and
The analog signal of channel INB2.Under parallel data pattern outputWhen for high level, the change data of A channel is read, is low
When level, the change data of channel B is read.It can be seen from hardware connection figureWithIt is grounded, AD exports number at this time
According to being continuously read, the digital signal output end of A/D chip is connected with GPIOC0~GPIOC15 of DSP respectively.
The selection of microprocessor:
The utility model is to the requirement of microprocessor following points:
1. can collection site weight of train data and to data carry out preliminary treatment；
2. realizing real time communication with host computer, collected weight data is sent to host computer and receives host computer refers to
It enables, the dynamic measurement for crossing weighing apparatus train is controlled；
3. executing efficiency is high；
4. low in energy consumption.
According to analysis, the processor for needing to select in design must have cracking processing speed.After comprehensively considering, I
Selected Freescale company produce MC56F8037.The main performance of the chip has:
(1) it executes speed and is up to 32MIPS, the instruction cycle is only 31ns.
(2) 64KB (32K × 16) flash storage, 8KB (4K × 16) RAM
(3) two 8 Channel 12-Bit analog-digital converters, two 12-bit digital-to-analog converters
(4) two analog comparators
(5) three programmable timer internals
(6) 53 two-way universal I/O ports are up to, it is convenient to realize various I/O operations.
(7) JTAG emulation interface enhanced is convenient for real-time perfoming debugging
The selection of LCD: for digital processing chip, LCD MODULE is a kind of slow devices.Liquid crystal display
There are two types of interface modes between module and DSP, and one is directly accessing, another kind is dereference.Directly access is by liquid crystal
Display controller is directly hung on dsp bus as I/O equipment, and DSP generates read-write control signal.Dereference mode is by liquid
The connection of the I/O interface of brilliant display module and DSP, DSP realize the control to LCD MODULE by the operation to I/O mouthfuls indirectly
System.This interface mode circuit structure is simple, and occupying system resources are few.It is of less demanding to LCD MODULE herein, so
Using the interface mode of dereference.Fig. 7 is the interface circuit figure of DSP and LCD MODULE.
LEDA and LEDK is the anode and cathode of LCD backlight respectively in figure.PSB is parallel/serial mouth selection end, high level
It is to show module using parallel port, low level then uses serial ports.SID is the parallel read-write control signal end of LCD MODULE, string
Capable data port；SCLK is the enable signal under LCD MODULE parallel schema, the synchronised clock under serial mode.RS/
CS is the instruction/data selection signal under parallel schema, and the chip selection signal under serial mode is connected with the GPIOB8 of DSP.
When design, limited in view of the I/O port quantity of DSP, and not high to LCD MODULE rate request, then DSP and liquid crystal
Serial connection method is used between display module.SID is connected with the I/O port GPIOB9 of DSP, for receiving display number from DSP
According to and control instruction.The end SCLK is connected with the GPIOB1 of DSP mouth, receives synchronizing clock signals.
Ethernet communication interface circuit:
Existing numerous dynamic railway truck scales generally use the vehicle weight number that RS485 serial communication interface arrives collection in worksite
According to host computer is transmitted to, RS485 interface effective propagation path is related with its baud rate, when baud rate is 9600bps, passes at this time
Defeated distance is up to 1200m, and transmission rate is low, and anti-interference ability is poor, it is difficult to meet system real time high-speed data communication
It is required that.And ethernet communication interface peak transfer rate is up to 10Mbits/s, transmission rate is fast, strong antijamming capability, reliability
It is high.In dynamic track balance system, a column train is by only several seconds time time of weighing table, and a column train has very much
Compartment is saved, a column train is completely very big by the collected data volume of weighing table institute, and also wants that these data can be carried out
Processing analysis in real time, so comprehensively considering, transmits data by the way of ethernet communication in this secondary design.
Ethernet interface hardware components are made of dsp chip MC56F8037 and ethernet control chip CP2200.By
CP2200 realizes that protocol integrated test system, dsp chip carry out Initialize installation and Row control to CP2200, saves DSP for communication
Resource can carry out real-time data communication while completing high-speed data acquisition.
Ethernet control chip CP2200: the core of Ethernet interface hardware components is ethernet control chip CP2200.
CP2200 is integrated with the MAC controller (MAC) of IEEE802.3,10base-T physical layer and the non-volatile Flash of 8KB
Memory does not need external EEPROM.Completely compatible 100/1000BASE-T network has two kinds of work sides of full and half duplex
Formula is able to carry out auto polarity detection and corrects, collide automatic repeating transmission, supports broadcast and multicast MAC addressing.8 parallel-by-bit hosts
Interface supports Intel or Motorola bus mode, and multiplexing can be used or multiplex mode addresses.With in received data packet
Disconnected and Wake on LAN is interrupted, and under the working method of multiplex, message transmission rate is up to 30Mbps.
CP2200 supply voltage range are as follows: 3.1~3.6V, operating temperature range are: -40 DEG C~+85 DEG C.It has 28 feet
QFN and two kinds of 48 foot TQFP encapsulation.Multiplex mode addressing is only supported in 28 foot QFN encapsulation.The chip possesses mode and selects pin, uses
In the different bus interface modes of selection.Flash storage can be used for storing user's constant, WEB server in the piece of CP2200
Content also acts as general non-volatile memory.It has 14 interrupt sources, can be micro- to microprocessor application interrupt processing
Processor in the response break processing after, can by read INT0 INT1 interrupt status register come remove interrupt.
The crystal oscillator frequency of CP2200 is 20MHz, it has the parallel host interface of a 8-bit, for the straight of access chip
Connect register.Parallel host supports multiplexing and multiplex mode, supports Intel and Motorola bus, can be by drawing high
MUXEN pin makes chip be in multiplexer mode, and dragging down the pin then makes chip be in non-multiplexed mode.Drawing high MOTEN pin makes
Chip is in Motorola bus mode, and dragging down MOTEN then makes chip be in Intel mode.Intel is used in this secondary design
Bus mode uses address date multiplex mode due to the limitation of DSP universal I/O port quantity.At CP2200 and digital signal
It is as shown in Figure 8 to manage chip MC56F8037 hardware connection figure.
It is exactly Ethernet transformer there are one important component part in ethernet interface circuit.Ethernet chip
Differential received pin on (RX+/RX-), need one be exclusively used in 10base-T operation 1:1 pulse transformer, difference send
On pin (TX+/TX-), need an external 1:2.5 with centre tapped pulse transformer.Transformer is with 2kV's or more
Voltage isolation performance is to prevent electrostatic interference.It can be seen that, in transmitting terminal, there are two connections from the hardware connection figure of CP2200
The capacitor of the resistance of 8 Ω and two 0.1uf receives the resistance for being terminated with 100 Ω.
According to actual requirement, HR911103A type transformer is used in design.The transformer is integrated with RJ-45 connector, firmly
Part line is simple, and transmission reliability is high.
In one embodiment, the side structure schematic diagram of track scale is as shown in figure 9, Fig. 9 is shown on weighing table
It is provided with track, track vertical direction is provided with traverse rod.Weighing table be in rectangle, weighing table quadrangle and in track
There are four sensor modules for lower section setting, and the sensor module includes sensor top board, sensor lower platen and limit
Module.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
For art personnel, without deviating from the technical principle of the utility model, several improvement and deformations can also be made, these change
It also should be regarded as the protection scope of the utility model into deformation.
Claims (8)
1. a kind of novel dynamic track balance system, characterized in that including weighing table, divide into sensor die in the weighing table
Block, the sensor module is in generation deformation on foil gauge and converting electricity for deformation for the gravity in measurement process
Subsignal output；It further include the data acquisition and processing (DAP) module being electrically connected with sensor module；
It further include bridge power supply module, microprocessor module, LCD display module, ethernet interface module；
The data acquisition and processing (DAP) module includes amplifier circuit module, filter circuit and AD conversion circuit module；It is described
The output of output connection the amplifier circuit module, amplifier circuit module of sensor module connects filter circuit, filter circuit
Output end connection AD conversion circuit module obtains input terminal；The output end of the AD conversion circuit module connects microprocessor module
Input terminal；
LCD display module is connect with microprocessor module for showing information；
The sensor module includes column type sensor and uses four independent column type sensors；
The bridge power supply module connects each module for being other module for power supply and being four independent column type sensor power supplies；
The ethernet interface module includes ethernet control chip and Ethernet transformer, the ethernet control chip with
Microprocessor module connection is connected with cable interface, and the Ethernet transformer is integrated with RJ-45 connector.
2. novel dynamic track balance system according to claim 1, which is characterized in that the microprocessor module uses type
Number be MC56F8037 DSP.
3. novel dynamic track balance system according to claim 1, which is characterized in that the column type sensor
Using resistance-strain chip pressure sensor PR6201.
4. novel dynamic track balance system according to claim 1, which is characterized in that the bridge power supply module be from
Track power circuit, including controllable accurate source of stable pressure TL431, in-phase amplifier, sign-changing amplifier, triode Q1, triode Q2, three
Pole pipe Q3, triode Q4；The input terminal of in-phase amplifier, same phase are input to after the TL431 output 2.5V reference voltage
Amplifier TL431 output 2.5V reference voltage is amplified twice after after triode Q1 driving triode Q2 export it is stable+
Anode of the 5V voltage as automatic tracking source circuit, the amplification factor of the sign-changing amplifier be 1 times its by positive pole+5V electricity
Reverse phase is pressed, is then driven by triode Q4, triode Q3 current limliting exports stable -5V voltage, as automatic tracking source circuit
Cathode.
5. novel dynamic track balance system according to claim 1, which is characterized in that AD conversion circuit module uses four-way
The gradually comparison A/D conversion chip AD7655 in 16, road.
6. the novel dynamic track balance system according to claim 2~5 any one claim, which is characterized in that institute
It states ethernet control chip and uses ethernet controller CP2200, the CP2200'sWith the 13rd pin of MC56F8037
The connection of GPIOB pin, CP2200'sThe connection of the 12nd pin GPIOB pin of pin and MC56F8037, CP2200'sDraw
The 14th pin GPIOB pin of foot and MC56F8037 connection, D1~D7 of CP2200 respectively with the GPIOB0 of MC56F8037~
The connection of GPIOB7 pin.
7. novel dynamic track balance system according to claim 1, which is characterized in that be provided on the weighing table
Track is provided with traverse rod with track vertical direction.
8. novel dynamic track balance system according to claim 7, which is characterized in that the weighing table is in rectangle,
The quadrangle of weighing table and in the setting of the lower section of track there are four sensor module, the sensor module includes pressing on sensor
Plate, sensor lower platen and limit module.
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| CN201821301530.XU CN208635900U (en) | 2018-08-13 | 2018-08-13 | A kind of novel dynamic track balance system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112710377A (en) * | 2019-10-25 | 2021-04-27 | 梅特勒-托利多(常州)精密仪器有限公司 | Dynamic weighing apparatus |
| CN112994636A (en) * | 2021-02-04 | 2021-06-18 | 珠海市丰润自动化科技有限公司 | Method for eliminating dead weight, storage medium and terminal |
| CN115484113A (en) * | 2022-07-04 | 2022-12-16 | 宁波柯力传感科技股份有限公司 | POE-based weighing sensor signal and power supply synchronization system and method |
-
2018
- 2018-08-13 CN CN201821301530.XU patent/CN208635900U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112710377A (en) * | 2019-10-25 | 2021-04-27 | 梅特勒-托利多(常州)精密仪器有限公司 | Dynamic weighing apparatus |
| EP3812716A1 (en) * | 2019-10-25 | 2021-04-28 | Mettler Toledo (Changzhou) Precision Instrument Ltd. | Dynamic weighing device |
| US11445341B2 (en) | 2019-10-25 | 2022-09-13 | Mettler-Toledo (Changzhou) Precision Instruments Co., Ltd. | Dynamic weighing device |
| CN112994636A (en) * | 2021-02-04 | 2021-06-18 | 珠海市丰润自动化科技有限公司 | Method for eliminating dead weight, storage medium and terminal |
| CN112994636B (en) * | 2021-02-04 | 2024-03-29 | 珠海市丰润自动化科技有限公司 | Dead weight eliminating method, storage medium and terminal |
| CN115484113A (en) * | 2022-07-04 | 2022-12-16 | 宁波柯力传感科技股份有限公司 | POE-based weighing sensor signal and power supply synchronization system and method |
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